1 //===--- SemaType.cpp - Semantic Analysis for Types -----------------------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // This file implements type-related semantic analysis. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #include "clang/Sema/ScopeInfo.h" 15 #include "clang/Sema/SemaInternal.h" 16 #include "clang/Sema/Template.h" 17 #include "clang/Basic/OpenCL.h" 18 #include "clang/AST/ASTContext.h" 19 #include "clang/AST/ASTMutationListener.h" 20 #include "clang/AST/CXXInheritance.h" 21 #include "clang/AST/DeclObjC.h" 22 #include "clang/AST/DeclTemplate.h" 23 #include "clang/AST/TypeLoc.h" 24 #include "clang/AST/TypeLocVisitor.h" 25 #include "clang/AST/Expr.h" 26 #include "clang/Basic/PartialDiagnostic.h" 27 #include "clang/Basic/TargetInfo.h" 28 #include "clang/Lex/Preprocessor.h" 29 #include "clang/Parse/ParseDiagnostic.h" 30 #include "clang/Sema/DeclSpec.h" 31 #include "clang/Sema/DelayedDiagnostic.h" 32 #include "clang/Sema/Lookup.h" 33 #include "llvm/ADT/SmallPtrSet.h" 34 #include "llvm/Support/ErrorHandling.h" 35 using namespace clang; 36 37 /// isOmittedBlockReturnType - Return true if this declarator is missing a 38 /// return type because this is a omitted return type on a block literal. 39 static bool isOmittedBlockReturnType(const Declarator &D) { 40 if (D.getContext() != Declarator::BlockLiteralContext || 41 D.getDeclSpec().hasTypeSpecifier()) 42 return false; 43 44 if (D.getNumTypeObjects() == 0) 45 return true; // ^{ ... } 46 47 if (D.getNumTypeObjects() == 1 && 48 D.getTypeObject(0).Kind == DeclaratorChunk::Function) 49 return true; // ^(int X, float Y) { ... } 50 51 return false; 52 } 53 54 /// diagnoseBadTypeAttribute - Diagnoses a type attribute which 55 /// doesn't apply to the given type. 56 static void diagnoseBadTypeAttribute(Sema &S, const AttributeList &attr, 57 QualType type) { 58 bool useExpansionLoc = false; 59 60 unsigned diagID = 0; 61 switch (attr.getKind()) { 62 case AttributeList::AT_objc_gc: 63 diagID = diag::warn_pointer_attribute_wrong_type; 64 useExpansionLoc = true; 65 break; 66 67 case AttributeList::AT_objc_ownership: 68 diagID = diag::warn_objc_object_attribute_wrong_type; 69 useExpansionLoc = true; 70 break; 71 72 default: 73 // Assume everything else was a function attribute. 74 diagID = diag::warn_function_attribute_wrong_type; 75 break; 76 } 77 78 SourceLocation loc = attr.getLoc(); 79 StringRef name = attr.getName()->getName(); 80 81 // The GC attributes are usually written with macros; special-case them. 82 if (useExpansionLoc && loc.isMacroID() && attr.getParameterName()) { 83 if (attr.getParameterName()->isStr("strong")) { 84 if (S.findMacroSpelling(loc, "__strong")) name = "__strong"; 85 } else if (attr.getParameterName()->isStr("weak")) { 86 if (S.findMacroSpelling(loc, "__weak")) name = "__weak"; 87 } 88 } 89 90 S.Diag(loc, diagID) << name << type; 91 } 92 93 // objc_gc applies to Objective-C pointers or, otherwise, to the 94 // smallest available pointer type (i.e. 'void*' in 'void**'). 95 #define OBJC_POINTER_TYPE_ATTRS_CASELIST \ 96 case AttributeList::AT_objc_gc: \ 97 case AttributeList::AT_objc_ownership 98 99 // Function type attributes. 100 #define FUNCTION_TYPE_ATTRS_CASELIST \ 101 case AttributeList::AT_noreturn: \ 102 case AttributeList::AT_cdecl: \ 103 case AttributeList::AT_fastcall: \ 104 case AttributeList::AT_stdcall: \ 105 case AttributeList::AT_thiscall: \ 106 case AttributeList::AT_pascal: \ 107 case AttributeList::AT_regparm: \ 108 case AttributeList::AT_pcs \ 109 110 namespace { 111 /// An object which stores processing state for the entire 112 /// GetTypeForDeclarator process. 113 class TypeProcessingState { 114 Sema &sema; 115 116 /// The declarator being processed. 117 Declarator &declarator; 118 119 /// The index of the declarator chunk we're currently processing. 120 /// May be the total number of valid chunks, indicating the 121 /// DeclSpec. 122 unsigned chunkIndex; 123 124 /// Whether there are non-trivial modifications to the decl spec. 125 bool trivial; 126 127 /// Whether we saved the attributes in the decl spec. 128 bool hasSavedAttrs; 129 130 /// The original set of attributes on the DeclSpec. 131 SmallVector<AttributeList*, 2> savedAttrs; 132 133 /// A list of attributes to diagnose the uselessness of when the 134 /// processing is complete. 135 SmallVector<AttributeList*, 2> ignoredTypeAttrs; 136 137 public: 138 TypeProcessingState(Sema &sema, Declarator &declarator) 139 : sema(sema), declarator(declarator), 140 chunkIndex(declarator.getNumTypeObjects()), 141 trivial(true), hasSavedAttrs(false) {} 142 143 Sema &getSema() const { 144 return sema; 145 } 146 147 Declarator &getDeclarator() const { 148 return declarator; 149 } 150 151 unsigned getCurrentChunkIndex() const { 152 return chunkIndex; 153 } 154 155 void setCurrentChunkIndex(unsigned idx) { 156 assert(idx <= declarator.getNumTypeObjects()); 157 chunkIndex = idx; 158 } 159 160 AttributeList *&getCurrentAttrListRef() const { 161 assert(chunkIndex <= declarator.getNumTypeObjects()); 162 if (chunkIndex == declarator.getNumTypeObjects()) 163 return getMutableDeclSpec().getAttributes().getListRef(); 164 return declarator.getTypeObject(chunkIndex).getAttrListRef(); 165 } 166 167 /// Save the current set of attributes on the DeclSpec. 168 void saveDeclSpecAttrs() { 169 // Don't try to save them multiple times. 170 if (hasSavedAttrs) return; 171 172 DeclSpec &spec = getMutableDeclSpec(); 173 for (AttributeList *attr = spec.getAttributes().getList(); attr; 174 attr = attr->getNext()) 175 savedAttrs.push_back(attr); 176 trivial &= savedAttrs.empty(); 177 hasSavedAttrs = true; 178 } 179 180 /// Record that we had nowhere to put the given type attribute. 181 /// We will diagnose such attributes later. 182 void addIgnoredTypeAttr(AttributeList &attr) { 183 ignoredTypeAttrs.push_back(&attr); 184 } 185 186 /// Diagnose all the ignored type attributes, given that the 187 /// declarator worked out to the given type. 188 void diagnoseIgnoredTypeAttrs(QualType type) const { 189 for (SmallVectorImpl<AttributeList*>::const_iterator 190 i = ignoredTypeAttrs.begin(), e = ignoredTypeAttrs.end(); 191 i != e; ++i) 192 diagnoseBadTypeAttribute(getSema(), **i, type); 193 } 194 195 ~TypeProcessingState() { 196 if (trivial) return; 197 198 restoreDeclSpecAttrs(); 199 } 200 201 private: 202 DeclSpec &getMutableDeclSpec() const { 203 return const_cast<DeclSpec&>(declarator.getDeclSpec()); 204 } 205 206 void restoreDeclSpecAttrs() { 207 assert(hasSavedAttrs); 208 209 if (savedAttrs.empty()) { 210 getMutableDeclSpec().getAttributes().set(0); 211 return; 212 } 213 214 getMutableDeclSpec().getAttributes().set(savedAttrs[0]); 215 for (unsigned i = 0, e = savedAttrs.size() - 1; i != e; ++i) 216 savedAttrs[i]->setNext(savedAttrs[i+1]); 217 savedAttrs.back()->setNext(0); 218 } 219 }; 220 221 /// Basically std::pair except that we really want to avoid an 222 /// implicit operator= for safety concerns. It's also a minor 223 /// link-time optimization for this to be a private type. 224 struct AttrAndList { 225 /// The attribute. 226 AttributeList &first; 227 228 /// The head of the list the attribute is currently in. 229 AttributeList *&second; 230 231 AttrAndList(AttributeList &attr, AttributeList *&head) 232 : first(attr), second(head) {} 233 }; 234 } 235 236 namespace llvm { 237 template <> struct isPodLike<AttrAndList> { 238 static const bool value = true; 239 }; 240 } 241 242 static void spliceAttrIntoList(AttributeList &attr, AttributeList *&head) { 243 attr.setNext(head); 244 head = &attr; 245 } 246 247 static void spliceAttrOutOfList(AttributeList &attr, AttributeList *&head) { 248 if (head == &attr) { 249 head = attr.getNext(); 250 return; 251 } 252 253 AttributeList *cur = head; 254 while (true) { 255 assert(cur && cur->getNext() && "ran out of attrs?"); 256 if (cur->getNext() == &attr) { 257 cur->setNext(attr.getNext()); 258 return; 259 } 260 cur = cur->getNext(); 261 } 262 } 263 264 static void moveAttrFromListToList(AttributeList &attr, 265 AttributeList *&fromList, 266 AttributeList *&toList) { 267 spliceAttrOutOfList(attr, fromList); 268 spliceAttrIntoList(attr, toList); 269 } 270 271 static void processTypeAttrs(TypeProcessingState &state, 272 QualType &type, bool isDeclSpec, 273 AttributeList *attrs); 274 275 static bool handleFunctionTypeAttr(TypeProcessingState &state, 276 AttributeList &attr, 277 QualType &type); 278 279 static bool handleObjCGCTypeAttr(TypeProcessingState &state, 280 AttributeList &attr, QualType &type); 281 282 static bool handleObjCOwnershipTypeAttr(TypeProcessingState &state, 283 AttributeList &attr, QualType &type); 284 285 static bool handleObjCPointerTypeAttr(TypeProcessingState &state, 286 AttributeList &attr, QualType &type) { 287 if (attr.getKind() == AttributeList::AT_objc_gc) 288 return handleObjCGCTypeAttr(state, attr, type); 289 assert(attr.getKind() == AttributeList::AT_objc_ownership); 290 return handleObjCOwnershipTypeAttr(state, attr, type); 291 } 292 293 /// Given that an objc_gc attribute was written somewhere on a 294 /// declaration *other* than on the declarator itself (for which, use 295 /// distributeObjCPointerTypeAttrFromDeclarator), and given that it 296 /// didn't apply in whatever position it was written in, try to move 297 /// it to a more appropriate position. 298 static void distributeObjCPointerTypeAttr(TypeProcessingState &state, 299 AttributeList &attr, 300 QualType type) { 301 Declarator &declarator = state.getDeclarator(); 302 for (unsigned i = state.getCurrentChunkIndex(); i != 0; --i) { 303 DeclaratorChunk &chunk = declarator.getTypeObject(i-1); 304 switch (chunk.Kind) { 305 case DeclaratorChunk::Pointer: 306 case DeclaratorChunk::BlockPointer: 307 moveAttrFromListToList(attr, state.getCurrentAttrListRef(), 308 chunk.getAttrListRef()); 309 return; 310 311 case DeclaratorChunk::Paren: 312 case DeclaratorChunk::Array: 313 continue; 314 315 // Don't walk through these. 316 case DeclaratorChunk::Reference: 317 case DeclaratorChunk::Function: 318 case DeclaratorChunk::MemberPointer: 319 goto error; 320 } 321 } 322 error: 323 324 diagnoseBadTypeAttribute(state.getSema(), attr, type); 325 } 326 327 /// Distribute an objc_gc type attribute that was written on the 328 /// declarator. 329 static void 330 distributeObjCPointerTypeAttrFromDeclarator(TypeProcessingState &state, 331 AttributeList &attr, 332 QualType &declSpecType) { 333 Declarator &declarator = state.getDeclarator(); 334 335 // objc_gc goes on the innermost pointer to something that's not a 336 // pointer. 337 unsigned innermost = -1U; 338 bool considerDeclSpec = true; 339 for (unsigned i = 0, e = declarator.getNumTypeObjects(); i != e; ++i) { 340 DeclaratorChunk &chunk = declarator.getTypeObject(i); 341 switch (chunk.Kind) { 342 case DeclaratorChunk::Pointer: 343 case DeclaratorChunk::BlockPointer: 344 innermost = i; 345 continue; 346 347 case DeclaratorChunk::Reference: 348 case DeclaratorChunk::MemberPointer: 349 case DeclaratorChunk::Paren: 350 case DeclaratorChunk::Array: 351 continue; 352 353 case DeclaratorChunk::Function: 354 considerDeclSpec = false; 355 goto done; 356 } 357 } 358 done: 359 360 // That might actually be the decl spec if we weren't blocked by 361 // anything in the declarator. 362 if (considerDeclSpec) { 363 if (handleObjCPointerTypeAttr(state, attr, declSpecType)) { 364 // Splice the attribute into the decl spec. Prevents the 365 // attribute from being applied multiple times and gives 366 // the source-location-filler something to work with. 367 state.saveDeclSpecAttrs(); 368 moveAttrFromListToList(attr, declarator.getAttrListRef(), 369 declarator.getMutableDeclSpec().getAttributes().getListRef()); 370 return; 371 } 372 } 373 374 // Otherwise, if we found an appropriate chunk, splice the attribute 375 // into it. 376 if (innermost != -1U) { 377 moveAttrFromListToList(attr, declarator.getAttrListRef(), 378 declarator.getTypeObject(innermost).getAttrListRef()); 379 return; 380 } 381 382 // Otherwise, diagnose when we're done building the type. 383 spliceAttrOutOfList(attr, declarator.getAttrListRef()); 384 state.addIgnoredTypeAttr(attr); 385 } 386 387 /// A function type attribute was written somewhere in a declaration 388 /// *other* than on the declarator itself or in the decl spec. Given 389 /// that it didn't apply in whatever position it was written in, try 390 /// to move it to a more appropriate position. 391 static void distributeFunctionTypeAttr(TypeProcessingState &state, 392 AttributeList &attr, 393 QualType type) { 394 Declarator &declarator = state.getDeclarator(); 395 396 // Try to push the attribute from the return type of a function to 397 // the function itself. 398 for (unsigned i = state.getCurrentChunkIndex(); i != 0; --i) { 399 DeclaratorChunk &chunk = declarator.getTypeObject(i-1); 400 switch (chunk.Kind) { 401 case DeclaratorChunk::Function: 402 moveAttrFromListToList(attr, state.getCurrentAttrListRef(), 403 chunk.getAttrListRef()); 404 return; 405 406 case DeclaratorChunk::Paren: 407 case DeclaratorChunk::Pointer: 408 case DeclaratorChunk::BlockPointer: 409 case DeclaratorChunk::Array: 410 case DeclaratorChunk::Reference: 411 case DeclaratorChunk::MemberPointer: 412 continue; 413 } 414 } 415 416 diagnoseBadTypeAttribute(state.getSema(), attr, type); 417 } 418 419 /// Try to distribute a function type attribute to the innermost 420 /// function chunk or type. Returns true if the attribute was 421 /// distributed, false if no location was found. 422 static bool 423 distributeFunctionTypeAttrToInnermost(TypeProcessingState &state, 424 AttributeList &attr, 425 AttributeList *&attrList, 426 QualType &declSpecType) { 427 Declarator &declarator = state.getDeclarator(); 428 429 // Put it on the innermost function chunk, if there is one. 430 for (unsigned i = 0, e = declarator.getNumTypeObjects(); i != e; ++i) { 431 DeclaratorChunk &chunk = declarator.getTypeObject(i); 432 if (chunk.Kind != DeclaratorChunk::Function) continue; 433 434 moveAttrFromListToList(attr, attrList, chunk.getAttrListRef()); 435 return true; 436 } 437 438 if (handleFunctionTypeAttr(state, attr, declSpecType)) { 439 spliceAttrOutOfList(attr, attrList); 440 return true; 441 } 442 443 return false; 444 } 445 446 /// A function type attribute was written in the decl spec. Try to 447 /// apply it somewhere. 448 static void 449 distributeFunctionTypeAttrFromDeclSpec(TypeProcessingState &state, 450 AttributeList &attr, 451 QualType &declSpecType) { 452 state.saveDeclSpecAttrs(); 453 454 // Try to distribute to the innermost. 455 if (distributeFunctionTypeAttrToInnermost(state, attr, 456 state.getCurrentAttrListRef(), 457 declSpecType)) 458 return; 459 460 // If that failed, diagnose the bad attribute when the declarator is 461 // fully built. 462 state.addIgnoredTypeAttr(attr); 463 } 464 465 /// A function type attribute was written on the declarator. Try to 466 /// apply it somewhere. 467 static void 468 distributeFunctionTypeAttrFromDeclarator(TypeProcessingState &state, 469 AttributeList &attr, 470 QualType &declSpecType) { 471 Declarator &declarator = state.getDeclarator(); 472 473 // Try to distribute to the innermost. 474 if (distributeFunctionTypeAttrToInnermost(state, attr, 475 declarator.getAttrListRef(), 476 declSpecType)) 477 return; 478 479 // If that failed, diagnose the bad attribute when the declarator is 480 // fully built. 481 spliceAttrOutOfList(attr, declarator.getAttrListRef()); 482 state.addIgnoredTypeAttr(attr); 483 } 484 485 /// \brief Given that there are attributes written on the declarator 486 /// itself, try to distribute any type attributes to the appropriate 487 /// declarator chunk. 488 /// 489 /// These are attributes like the following: 490 /// int f ATTR; 491 /// int (f ATTR)(); 492 /// but not necessarily this: 493 /// int f() ATTR; 494 static void distributeTypeAttrsFromDeclarator(TypeProcessingState &state, 495 QualType &declSpecType) { 496 // Collect all the type attributes from the declarator itself. 497 assert(state.getDeclarator().getAttributes() && "declarator has no attrs!"); 498 AttributeList *attr = state.getDeclarator().getAttributes(); 499 AttributeList *next; 500 do { 501 next = attr->getNext(); 502 503 switch (attr->getKind()) { 504 OBJC_POINTER_TYPE_ATTRS_CASELIST: 505 distributeObjCPointerTypeAttrFromDeclarator(state, *attr, declSpecType); 506 break; 507 508 case AttributeList::AT_ns_returns_retained: 509 if (!state.getSema().getLangOpts().ObjCAutoRefCount) 510 break; 511 // fallthrough 512 513 FUNCTION_TYPE_ATTRS_CASELIST: 514 distributeFunctionTypeAttrFromDeclarator(state, *attr, declSpecType); 515 break; 516 517 default: 518 break; 519 } 520 } while ((attr = next)); 521 } 522 523 /// Add a synthetic '()' to a block-literal declarator if it is 524 /// required, given the return type. 525 static void maybeSynthesizeBlockSignature(TypeProcessingState &state, 526 QualType declSpecType) { 527 Declarator &declarator = state.getDeclarator(); 528 529 // First, check whether the declarator would produce a function, 530 // i.e. whether the innermost semantic chunk is a function. 531 if (declarator.isFunctionDeclarator()) { 532 // If so, make that declarator a prototyped declarator. 533 declarator.getFunctionTypeInfo().hasPrototype = true; 534 return; 535 } 536 537 // If there are any type objects, the type as written won't name a 538 // function, regardless of the decl spec type. This is because a 539 // block signature declarator is always an abstract-declarator, and 540 // abstract-declarators can't just be parentheses chunks. Therefore 541 // we need to build a function chunk unless there are no type 542 // objects and the decl spec type is a function. 543 if (!declarator.getNumTypeObjects() && declSpecType->isFunctionType()) 544 return; 545 546 // Note that there *are* cases with invalid declarators where 547 // declarators consist solely of parentheses. In general, these 548 // occur only in failed efforts to make function declarators, so 549 // faking up the function chunk is still the right thing to do. 550 551 // Otherwise, we need to fake up a function declarator. 552 SourceLocation loc = declarator.getLocStart(); 553 554 // ...and *prepend* it to the declarator. 555 declarator.AddInnermostTypeInfo(DeclaratorChunk::getFunction( 556 /*proto*/ true, 557 /*variadic*/ false, SourceLocation(), 558 /*args*/ 0, 0, 559 /*type quals*/ 0, 560 /*ref-qualifier*/true, SourceLocation(), 561 /*const qualifier*/SourceLocation(), 562 /*volatile qualifier*/SourceLocation(), 563 /*mutable qualifier*/SourceLocation(), 564 /*EH*/ EST_None, SourceLocation(), 0, 0, 0, 0, 0, 565 /*parens*/ loc, loc, 566 declarator)); 567 568 // For consistency, make sure the state still has us as processing 569 // the decl spec. 570 assert(state.getCurrentChunkIndex() == declarator.getNumTypeObjects() - 1); 571 state.setCurrentChunkIndex(declarator.getNumTypeObjects()); 572 } 573 574 /// \brief Convert the specified declspec to the appropriate type 575 /// object. 576 /// \param D the declarator containing the declaration specifier. 577 /// \returns The type described by the declaration specifiers. This function 578 /// never returns null. 579 static QualType ConvertDeclSpecToType(TypeProcessingState &state) { 580 // FIXME: Should move the logic from DeclSpec::Finish to here for validity 581 // checking. 582 583 Sema &S = state.getSema(); 584 Declarator &declarator = state.getDeclarator(); 585 const DeclSpec &DS = declarator.getDeclSpec(); 586 SourceLocation DeclLoc = declarator.getIdentifierLoc(); 587 if (DeclLoc.isInvalid()) 588 DeclLoc = DS.getLocStart(); 589 590 ASTContext &Context = S.Context; 591 592 QualType Result; 593 switch (DS.getTypeSpecType()) { 594 case DeclSpec::TST_void: 595 Result = Context.VoidTy; 596 break; 597 case DeclSpec::TST_char: 598 if (DS.getTypeSpecSign() == DeclSpec::TSS_unspecified) 599 Result = Context.CharTy; 600 else if (DS.getTypeSpecSign() == DeclSpec::TSS_signed) 601 Result = Context.SignedCharTy; 602 else { 603 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unsigned && 604 "Unknown TSS value"); 605 Result = Context.UnsignedCharTy; 606 } 607 break; 608 case DeclSpec::TST_wchar: 609 if (DS.getTypeSpecSign() == DeclSpec::TSS_unspecified) 610 Result = Context.WCharTy; 611 else if (DS.getTypeSpecSign() == DeclSpec::TSS_signed) { 612 S.Diag(DS.getTypeSpecSignLoc(), diag::ext_invalid_sign_spec) 613 << DS.getSpecifierName(DS.getTypeSpecType()); 614 Result = Context.getSignedWCharType(); 615 } else { 616 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unsigned && 617 "Unknown TSS value"); 618 S.Diag(DS.getTypeSpecSignLoc(), diag::ext_invalid_sign_spec) 619 << DS.getSpecifierName(DS.getTypeSpecType()); 620 Result = Context.getUnsignedWCharType(); 621 } 622 break; 623 case DeclSpec::TST_char16: 624 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unspecified && 625 "Unknown TSS value"); 626 Result = Context.Char16Ty; 627 break; 628 case DeclSpec::TST_char32: 629 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unspecified && 630 "Unknown TSS value"); 631 Result = Context.Char32Ty; 632 break; 633 case DeclSpec::TST_unspecified: 634 // "<proto1,proto2>" is an objc qualified ID with a missing id. 635 if (DeclSpec::ProtocolQualifierListTy PQ = DS.getProtocolQualifiers()) { 636 Result = Context.getObjCObjectType(Context.ObjCBuiltinIdTy, 637 (ObjCProtocolDecl**)PQ, 638 DS.getNumProtocolQualifiers()); 639 Result = Context.getObjCObjectPointerType(Result); 640 break; 641 } 642 643 // If this is a missing declspec in a block literal return context, then it 644 // is inferred from the return statements inside the block. 645 // The declspec is always missing in a lambda expr context; it is either 646 // specified with a trailing return type or inferred. 647 if (declarator.getContext() == Declarator::LambdaExprContext || 648 isOmittedBlockReturnType(declarator)) { 649 Result = Context.DependentTy; 650 break; 651 } 652 653 // Unspecified typespec defaults to int in C90. However, the C90 grammar 654 // [C90 6.5] only allows a decl-spec if there was *some* type-specifier, 655 // type-qualifier, or storage-class-specifier. If not, emit an extwarn. 656 // Note that the one exception to this is function definitions, which are 657 // allowed to be completely missing a declspec. This is handled in the 658 // parser already though by it pretending to have seen an 'int' in this 659 // case. 660 if (S.getLangOpts().ImplicitInt) { 661 // In C89 mode, we only warn if there is a completely missing declspec 662 // when one is not allowed. 663 if (DS.isEmpty()) { 664 S.Diag(DeclLoc, diag::ext_missing_declspec) 665 << DS.getSourceRange() 666 << FixItHint::CreateInsertion(DS.getLocStart(), "int"); 667 } 668 } else if (!DS.hasTypeSpecifier()) { 669 // C99 and C++ require a type specifier. For example, C99 6.7.2p2 says: 670 // "At least one type specifier shall be given in the declaration 671 // specifiers in each declaration, and in the specifier-qualifier list in 672 // each struct declaration and type name." 673 // FIXME: Does Microsoft really have the implicit int extension in C++? 674 if (S.getLangOpts().CPlusPlus && 675 !S.getLangOpts().MicrosoftExt) { 676 S.Diag(DeclLoc, diag::err_missing_type_specifier) 677 << DS.getSourceRange(); 678 679 // When this occurs in C++ code, often something is very broken with the 680 // value being declared, poison it as invalid so we don't get chains of 681 // errors. 682 declarator.setInvalidType(true); 683 } else { 684 S.Diag(DeclLoc, diag::ext_missing_type_specifier) 685 << DS.getSourceRange(); 686 } 687 } 688 689 // FALL THROUGH. 690 case DeclSpec::TST_int: { 691 if (DS.getTypeSpecSign() != DeclSpec::TSS_unsigned) { 692 switch (DS.getTypeSpecWidth()) { 693 case DeclSpec::TSW_unspecified: Result = Context.IntTy; break; 694 case DeclSpec::TSW_short: Result = Context.ShortTy; break; 695 case DeclSpec::TSW_long: Result = Context.LongTy; break; 696 case DeclSpec::TSW_longlong: 697 Result = Context.LongLongTy; 698 699 // long long is a C99 feature. 700 if (!S.getLangOpts().C99) 701 S.Diag(DS.getTypeSpecWidthLoc(), 702 S.getLangOpts().CPlusPlus0x ? 703 diag::warn_cxx98_compat_longlong : diag::ext_longlong); 704 break; 705 } 706 } else { 707 switch (DS.getTypeSpecWidth()) { 708 case DeclSpec::TSW_unspecified: Result = Context.UnsignedIntTy; break; 709 case DeclSpec::TSW_short: Result = Context.UnsignedShortTy; break; 710 case DeclSpec::TSW_long: Result = Context.UnsignedLongTy; break; 711 case DeclSpec::TSW_longlong: 712 Result = Context.UnsignedLongLongTy; 713 714 // long long is a C99 feature. 715 if (!S.getLangOpts().C99) 716 S.Diag(DS.getTypeSpecWidthLoc(), 717 S.getLangOpts().CPlusPlus0x ? 718 diag::warn_cxx98_compat_longlong : diag::ext_longlong); 719 break; 720 } 721 } 722 break; 723 } 724 case DeclSpec::TST_int128: 725 if (DS.getTypeSpecSign() == DeclSpec::TSS_unsigned) 726 Result = Context.UnsignedInt128Ty; 727 else 728 Result = Context.Int128Ty; 729 break; 730 case DeclSpec::TST_half: Result = Context.HalfTy; break; 731 case DeclSpec::TST_float: Result = Context.FloatTy; break; 732 case DeclSpec::TST_double: 733 if (DS.getTypeSpecWidth() == DeclSpec::TSW_long) 734 Result = Context.LongDoubleTy; 735 else 736 Result = Context.DoubleTy; 737 738 if (S.getLangOpts().OpenCL && !S.getOpenCLOptions().cl_khr_fp64) { 739 S.Diag(DS.getTypeSpecTypeLoc(), diag::err_double_requires_fp64); 740 declarator.setInvalidType(true); 741 } 742 break; 743 case DeclSpec::TST_bool: Result = Context.BoolTy; break; // _Bool or bool 744 case DeclSpec::TST_decimal32: // _Decimal32 745 case DeclSpec::TST_decimal64: // _Decimal64 746 case DeclSpec::TST_decimal128: // _Decimal128 747 S.Diag(DS.getTypeSpecTypeLoc(), diag::err_decimal_unsupported); 748 Result = Context.IntTy; 749 declarator.setInvalidType(true); 750 break; 751 case DeclSpec::TST_class: 752 case DeclSpec::TST_enum: 753 case DeclSpec::TST_union: 754 case DeclSpec::TST_struct: { 755 TypeDecl *D = dyn_cast_or_null<TypeDecl>(DS.getRepAsDecl()); 756 if (!D) { 757 // This can happen in C++ with ambiguous lookups. 758 Result = Context.IntTy; 759 declarator.setInvalidType(true); 760 break; 761 } 762 763 // If the type is deprecated or unavailable, diagnose it. 764 S.DiagnoseUseOfDecl(D, DS.getTypeSpecTypeNameLoc()); 765 766 assert(DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 && 767 DS.getTypeSpecSign() == 0 && "No qualifiers on tag names!"); 768 769 // TypeQuals handled by caller. 770 Result = Context.getTypeDeclType(D); 771 772 // In both C and C++, make an ElaboratedType. 773 ElaboratedTypeKeyword Keyword 774 = ElaboratedType::getKeywordForTypeSpec(DS.getTypeSpecType()); 775 Result = S.getElaboratedType(Keyword, DS.getTypeSpecScope(), Result); 776 break; 777 } 778 case DeclSpec::TST_typename: { 779 assert(DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 && 780 DS.getTypeSpecSign() == 0 && 781 "Can't handle qualifiers on typedef names yet!"); 782 Result = S.GetTypeFromParser(DS.getRepAsType()); 783 if (Result.isNull()) 784 declarator.setInvalidType(true); 785 else if (DeclSpec::ProtocolQualifierListTy PQ 786 = DS.getProtocolQualifiers()) { 787 if (const ObjCObjectType *ObjT = Result->getAs<ObjCObjectType>()) { 788 // Silently drop any existing protocol qualifiers. 789 // TODO: determine whether that's the right thing to do. 790 if (ObjT->getNumProtocols()) 791 Result = ObjT->getBaseType(); 792 793 if (DS.getNumProtocolQualifiers()) 794 Result = Context.getObjCObjectType(Result, 795 (ObjCProtocolDecl**) PQ, 796 DS.getNumProtocolQualifiers()); 797 } else if (Result->isObjCIdType()) { 798 // id<protocol-list> 799 Result = Context.getObjCObjectType(Context.ObjCBuiltinIdTy, 800 (ObjCProtocolDecl**) PQ, 801 DS.getNumProtocolQualifiers()); 802 Result = Context.getObjCObjectPointerType(Result); 803 } else if (Result->isObjCClassType()) { 804 // Class<protocol-list> 805 Result = Context.getObjCObjectType(Context.ObjCBuiltinClassTy, 806 (ObjCProtocolDecl**) PQ, 807 DS.getNumProtocolQualifiers()); 808 Result = Context.getObjCObjectPointerType(Result); 809 } else { 810 S.Diag(DeclLoc, diag::err_invalid_protocol_qualifiers) 811 << DS.getSourceRange(); 812 declarator.setInvalidType(true); 813 } 814 } 815 816 // TypeQuals handled by caller. 817 break; 818 } 819 case DeclSpec::TST_typeofType: 820 // FIXME: Preserve type source info. 821 Result = S.GetTypeFromParser(DS.getRepAsType()); 822 assert(!Result.isNull() && "Didn't get a type for typeof?"); 823 if (!Result->isDependentType()) 824 if (const TagType *TT = Result->getAs<TagType>()) 825 S.DiagnoseUseOfDecl(TT->getDecl(), DS.getTypeSpecTypeLoc()); 826 // TypeQuals handled by caller. 827 Result = Context.getTypeOfType(Result); 828 break; 829 case DeclSpec::TST_typeofExpr: { 830 Expr *E = DS.getRepAsExpr(); 831 assert(E && "Didn't get an expression for typeof?"); 832 // TypeQuals handled by caller. 833 Result = S.BuildTypeofExprType(E, DS.getTypeSpecTypeLoc()); 834 if (Result.isNull()) { 835 Result = Context.IntTy; 836 declarator.setInvalidType(true); 837 } 838 break; 839 } 840 case DeclSpec::TST_decltype: { 841 Expr *E = DS.getRepAsExpr(); 842 assert(E && "Didn't get an expression for decltype?"); 843 // TypeQuals handled by caller. 844 Result = S.BuildDecltypeType(E, DS.getTypeSpecTypeLoc()); 845 if (Result.isNull()) { 846 Result = Context.IntTy; 847 declarator.setInvalidType(true); 848 } 849 break; 850 } 851 case DeclSpec::TST_underlyingType: 852 Result = S.GetTypeFromParser(DS.getRepAsType()); 853 assert(!Result.isNull() && "Didn't get a type for __underlying_type?"); 854 Result = S.BuildUnaryTransformType(Result, 855 UnaryTransformType::EnumUnderlyingType, 856 DS.getTypeSpecTypeLoc()); 857 if (Result.isNull()) { 858 Result = Context.IntTy; 859 declarator.setInvalidType(true); 860 } 861 break; 862 863 case DeclSpec::TST_auto: { 864 // TypeQuals handled by caller. 865 Result = Context.getAutoType(QualType()); 866 break; 867 } 868 869 case DeclSpec::TST_unknown_anytype: 870 Result = Context.UnknownAnyTy; 871 break; 872 873 case DeclSpec::TST_atomic: 874 Result = S.GetTypeFromParser(DS.getRepAsType()); 875 assert(!Result.isNull() && "Didn't get a type for _Atomic?"); 876 Result = S.BuildAtomicType(Result, DS.getTypeSpecTypeLoc()); 877 if (Result.isNull()) { 878 Result = Context.IntTy; 879 declarator.setInvalidType(true); 880 } 881 break; 882 883 case DeclSpec::TST_error: 884 Result = Context.IntTy; 885 declarator.setInvalidType(true); 886 break; 887 } 888 889 // Handle complex types. 890 if (DS.getTypeSpecComplex() == DeclSpec::TSC_complex) { 891 if (S.getLangOpts().Freestanding) 892 S.Diag(DS.getTypeSpecComplexLoc(), diag::ext_freestanding_complex); 893 Result = Context.getComplexType(Result); 894 } else if (DS.isTypeAltiVecVector()) { 895 unsigned typeSize = static_cast<unsigned>(Context.getTypeSize(Result)); 896 assert(typeSize > 0 && "type size for vector must be greater than 0 bits"); 897 VectorType::VectorKind VecKind = VectorType::AltiVecVector; 898 if (DS.isTypeAltiVecPixel()) 899 VecKind = VectorType::AltiVecPixel; 900 else if (DS.isTypeAltiVecBool()) 901 VecKind = VectorType::AltiVecBool; 902 Result = Context.getVectorType(Result, 128/typeSize, VecKind); 903 } 904 905 // FIXME: Imaginary. 906 if (DS.getTypeSpecComplex() == DeclSpec::TSC_imaginary) 907 S.Diag(DS.getTypeSpecComplexLoc(), diag::err_imaginary_not_supported); 908 909 // Before we process any type attributes, synthesize a block literal 910 // function declarator if necessary. 911 if (declarator.getContext() == Declarator::BlockLiteralContext) 912 maybeSynthesizeBlockSignature(state, Result); 913 914 // Apply any type attributes from the decl spec. This may cause the 915 // list of type attributes to be temporarily saved while the type 916 // attributes are pushed around. 917 if (AttributeList *attrs = DS.getAttributes().getList()) 918 processTypeAttrs(state, Result, true, attrs); 919 920 // Apply const/volatile/restrict qualifiers to T. 921 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 922 923 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 924 // or incomplete types shall not be restrict-qualified." C++ also allows 925 // restrict-qualified references. 926 if (TypeQuals & DeclSpec::TQ_restrict) { 927 if (Result->isAnyPointerType() || Result->isReferenceType()) { 928 QualType EltTy; 929 if (Result->isObjCObjectPointerType()) 930 EltTy = Result; 931 else 932 EltTy = Result->isPointerType() ? 933 Result->getAs<PointerType>()->getPointeeType() : 934 Result->getAs<ReferenceType>()->getPointeeType(); 935 936 // If we have a pointer or reference, the pointee must have an object 937 // incomplete type. 938 if (!EltTy->isIncompleteOrObjectType()) { 939 S.Diag(DS.getRestrictSpecLoc(), 940 diag::err_typecheck_invalid_restrict_invalid_pointee) 941 << EltTy << DS.getSourceRange(); 942 TypeQuals &= ~DeclSpec::TQ_restrict; // Remove the restrict qualifier. 943 } 944 } else { 945 S.Diag(DS.getRestrictSpecLoc(), 946 diag::err_typecheck_invalid_restrict_not_pointer) 947 << Result << DS.getSourceRange(); 948 TypeQuals &= ~DeclSpec::TQ_restrict; // Remove the restrict qualifier. 949 } 950 } 951 952 // Warn about CV qualifiers on functions: C99 6.7.3p8: "If the specification 953 // of a function type includes any type qualifiers, the behavior is 954 // undefined." 955 if (Result->isFunctionType() && TypeQuals) { 956 // Get some location to point at, either the C or V location. 957 SourceLocation Loc; 958 if (TypeQuals & DeclSpec::TQ_const) 959 Loc = DS.getConstSpecLoc(); 960 else if (TypeQuals & DeclSpec::TQ_volatile) 961 Loc = DS.getVolatileSpecLoc(); 962 else { 963 assert((TypeQuals & DeclSpec::TQ_restrict) && 964 "Has CVR quals but not C, V, or R?"); 965 Loc = DS.getRestrictSpecLoc(); 966 } 967 S.Diag(Loc, diag::warn_typecheck_function_qualifiers) 968 << Result << DS.getSourceRange(); 969 } 970 971 // C++ [dcl.ref]p1: 972 // Cv-qualified references are ill-formed except when the 973 // cv-qualifiers are introduced through the use of a typedef 974 // (7.1.3) or of a template type argument (14.3), in which 975 // case the cv-qualifiers are ignored. 976 // FIXME: Shouldn't we be checking SCS_typedef here? 977 if (DS.getTypeSpecType() == DeclSpec::TST_typename && 978 TypeQuals && Result->isReferenceType()) { 979 TypeQuals &= ~DeclSpec::TQ_const; 980 TypeQuals &= ~DeclSpec::TQ_volatile; 981 } 982 983 // C90 6.5.3 constraints: "The same type qualifier shall not appear more 984 // than once in the same specifier-list or qualifier-list, either directly 985 // or via one or more typedefs." 986 if (!S.getLangOpts().C99 && !S.getLangOpts().CPlusPlus 987 && TypeQuals & Result.getCVRQualifiers()) { 988 if (TypeQuals & DeclSpec::TQ_const && Result.isConstQualified()) { 989 S.Diag(DS.getConstSpecLoc(), diag::ext_duplicate_declspec) 990 << "const"; 991 } 992 993 if (TypeQuals & DeclSpec::TQ_volatile && Result.isVolatileQualified()) { 994 S.Diag(DS.getVolatileSpecLoc(), diag::ext_duplicate_declspec) 995 << "volatile"; 996 } 997 998 // C90 doesn't have restrict, so it doesn't force us to produce a warning 999 // in this case. 1000 } 1001 1002 Qualifiers Quals = Qualifiers::fromCVRMask(TypeQuals); 1003 Result = Context.getQualifiedType(Result, Quals); 1004 } 1005 1006 return Result; 1007 } 1008 1009 static std::string getPrintableNameForEntity(DeclarationName Entity) { 1010 if (Entity) 1011 return Entity.getAsString(); 1012 1013 return "type name"; 1014 } 1015 1016 QualType Sema::BuildQualifiedType(QualType T, SourceLocation Loc, 1017 Qualifiers Qs) { 1018 // Enforce C99 6.7.3p2: "Types other than pointer types derived from 1019 // object or incomplete types shall not be restrict-qualified." 1020 if (Qs.hasRestrict()) { 1021 unsigned DiagID = 0; 1022 QualType ProblemTy; 1023 1024 const Type *Ty = T->getCanonicalTypeInternal().getTypePtr(); 1025 if (const ReferenceType *RTy = dyn_cast<ReferenceType>(Ty)) { 1026 if (!RTy->getPointeeType()->isIncompleteOrObjectType()) { 1027 DiagID = diag::err_typecheck_invalid_restrict_invalid_pointee; 1028 ProblemTy = T->getAs<ReferenceType>()->getPointeeType(); 1029 } 1030 } else if (const PointerType *PTy = dyn_cast<PointerType>(Ty)) { 1031 if (!PTy->getPointeeType()->isIncompleteOrObjectType()) { 1032 DiagID = diag::err_typecheck_invalid_restrict_invalid_pointee; 1033 ProblemTy = T->getAs<PointerType>()->getPointeeType(); 1034 } 1035 } else if (const MemberPointerType *PTy = dyn_cast<MemberPointerType>(Ty)) { 1036 if (!PTy->getPointeeType()->isIncompleteOrObjectType()) { 1037 DiagID = diag::err_typecheck_invalid_restrict_invalid_pointee; 1038 ProblemTy = T->getAs<PointerType>()->getPointeeType(); 1039 } 1040 } else if (!Ty->isDependentType()) { 1041 // FIXME: this deserves a proper diagnostic 1042 DiagID = diag::err_typecheck_invalid_restrict_invalid_pointee; 1043 ProblemTy = T; 1044 } 1045 1046 if (DiagID) { 1047 Diag(Loc, DiagID) << ProblemTy; 1048 Qs.removeRestrict(); 1049 } 1050 } 1051 1052 return Context.getQualifiedType(T, Qs); 1053 } 1054 1055 /// \brief Build a paren type including \p T. 1056 QualType Sema::BuildParenType(QualType T) { 1057 return Context.getParenType(T); 1058 } 1059 1060 /// Given that we're building a pointer or reference to the given 1061 static QualType inferARCLifetimeForPointee(Sema &S, QualType type, 1062 SourceLocation loc, 1063 bool isReference) { 1064 // Bail out if retention is unrequired or already specified. 1065 if (!type->isObjCLifetimeType() || 1066 type.getObjCLifetime() != Qualifiers::OCL_None) 1067 return type; 1068 1069 Qualifiers::ObjCLifetime implicitLifetime = Qualifiers::OCL_None; 1070 1071 // If the object type is const-qualified, we can safely use 1072 // __unsafe_unretained. This is safe (because there are no read 1073 // barriers), and it'll be safe to coerce anything but __weak* to 1074 // the resulting type. 1075 if (type.isConstQualified()) { 1076 implicitLifetime = Qualifiers::OCL_ExplicitNone; 1077 1078 // Otherwise, check whether the static type does not require 1079 // retaining. This currently only triggers for Class (possibly 1080 // protocol-qualifed, and arrays thereof). 1081 } else if (type->isObjCARCImplicitlyUnretainedType()) { 1082 implicitLifetime = Qualifiers::OCL_ExplicitNone; 1083 1084 // If we are in an unevaluated context, like sizeof, skip adding a 1085 // qualification. 1086 } else if (S.ExprEvalContexts.back().Context == Sema::Unevaluated) { 1087 return type; 1088 1089 // If that failed, give an error and recover using __strong. __strong 1090 // is the option most likely to prevent spurious second-order diagnostics, 1091 // like when binding a reference to a field. 1092 } else { 1093 // These types can show up in private ivars in system headers, so 1094 // we need this to not be an error in those cases. Instead we 1095 // want to delay. 1096 if (S.DelayedDiagnostics.shouldDelayDiagnostics()) { 1097 S.DelayedDiagnostics.add( 1098 sema::DelayedDiagnostic::makeForbiddenType(loc, 1099 diag::err_arc_indirect_no_ownership, type, isReference)); 1100 } else { 1101 S.Diag(loc, diag::err_arc_indirect_no_ownership) << type << isReference; 1102 } 1103 implicitLifetime = Qualifiers::OCL_Strong; 1104 } 1105 assert(implicitLifetime && "didn't infer any lifetime!"); 1106 1107 Qualifiers qs; 1108 qs.addObjCLifetime(implicitLifetime); 1109 return S.Context.getQualifiedType(type, qs); 1110 } 1111 1112 /// \brief Build a pointer type. 1113 /// 1114 /// \param T The type to which we'll be building a pointer. 1115 /// 1116 /// \param Loc The location of the entity whose type involves this 1117 /// pointer type or, if there is no such entity, the location of the 1118 /// type that will have pointer type. 1119 /// 1120 /// \param Entity The name of the entity that involves the pointer 1121 /// type, if known. 1122 /// 1123 /// \returns A suitable pointer type, if there are no 1124 /// errors. Otherwise, returns a NULL type. 1125 QualType Sema::BuildPointerType(QualType T, 1126 SourceLocation Loc, DeclarationName Entity) { 1127 if (T->isReferenceType()) { 1128 // C++ 8.3.2p4: There shall be no ... pointers to references ... 1129 Diag(Loc, diag::err_illegal_decl_pointer_to_reference) 1130 << getPrintableNameForEntity(Entity) << T; 1131 return QualType(); 1132 } 1133 1134 assert(!T->isObjCObjectType() && "Should build ObjCObjectPointerType"); 1135 1136 // In ARC, it is forbidden to build pointers to unqualified pointers. 1137 if (getLangOpts().ObjCAutoRefCount) 1138 T = inferARCLifetimeForPointee(*this, T, Loc, /*reference*/ false); 1139 1140 // Build the pointer type. 1141 return Context.getPointerType(T); 1142 } 1143 1144 /// \brief Build a reference type. 1145 /// 1146 /// \param T The type to which we'll be building a reference. 1147 /// 1148 /// \param Loc The location of the entity whose type involves this 1149 /// reference type or, if there is no such entity, the location of the 1150 /// type that will have reference type. 1151 /// 1152 /// \param Entity The name of the entity that involves the reference 1153 /// type, if known. 1154 /// 1155 /// \returns A suitable reference type, if there are no 1156 /// errors. Otherwise, returns a NULL type. 1157 QualType Sema::BuildReferenceType(QualType T, bool SpelledAsLValue, 1158 SourceLocation Loc, 1159 DeclarationName Entity) { 1160 assert(Context.getCanonicalType(T) != Context.OverloadTy && 1161 "Unresolved overloaded function type"); 1162 1163 // C++0x [dcl.ref]p6: 1164 // If a typedef (7.1.3), a type template-parameter (14.3.1), or a 1165 // decltype-specifier (7.1.6.2) denotes a type TR that is a reference to a 1166 // type T, an attempt to create the type "lvalue reference to cv TR" creates 1167 // the type "lvalue reference to T", while an attempt to create the type 1168 // "rvalue reference to cv TR" creates the type TR. 1169 bool LValueRef = SpelledAsLValue || T->getAs<LValueReferenceType>(); 1170 1171 // C++ [dcl.ref]p4: There shall be no references to references. 1172 // 1173 // According to C++ DR 106, references to references are only 1174 // diagnosed when they are written directly (e.g., "int & &"), 1175 // but not when they happen via a typedef: 1176 // 1177 // typedef int& intref; 1178 // typedef intref& intref2; 1179 // 1180 // Parser::ParseDeclaratorInternal diagnoses the case where 1181 // references are written directly; here, we handle the 1182 // collapsing of references-to-references as described in C++0x. 1183 // DR 106 and 540 introduce reference-collapsing into C++98/03. 1184 1185 // C++ [dcl.ref]p1: 1186 // A declarator that specifies the type "reference to cv void" 1187 // is ill-formed. 1188 if (T->isVoidType()) { 1189 Diag(Loc, diag::err_reference_to_void); 1190 return QualType(); 1191 } 1192 1193 // In ARC, it is forbidden to build references to unqualified pointers. 1194 if (getLangOpts().ObjCAutoRefCount) 1195 T = inferARCLifetimeForPointee(*this, T, Loc, /*reference*/ true); 1196 1197 // Handle restrict on references. 1198 if (LValueRef) 1199 return Context.getLValueReferenceType(T, SpelledAsLValue); 1200 return Context.getRValueReferenceType(T); 1201 } 1202 1203 /// Check whether the specified array size makes the array type a VLA. If so, 1204 /// return true, if not, return the size of the array in SizeVal. 1205 static bool isArraySizeVLA(Sema &S, Expr *ArraySize, llvm::APSInt &SizeVal) { 1206 // If the size is an ICE, it certainly isn't a VLA. If we're in a GNU mode 1207 // (like gnu99, but not c99) accept any evaluatable value as an extension. 1208 return S.VerifyIntegerConstantExpression( 1209 ArraySize, &SizeVal, S.PDiag(), S.LangOpts.GNUMode, 1210 S.PDiag(diag::ext_vla_folded_to_constant)).isInvalid(); 1211 } 1212 1213 1214 /// \brief Build an array type. 1215 /// 1216 /// \param T The type of each element in the array. 1217 /// 1218 /// \param ASM C99 array size modifier (e.g., '*', 'static'). 1219 /// 1220 /// \param ArraySize Expression describing the size of the array. 1221 /// 1222 /// \param Loc The location of the entity whose type involves this 1223 /// array type or, if there is no such entity, the location of the 1224 /// type that will have array type. 1225 /// 1226 /// \param Entity The name of the entity that involves the array 1227 /// type, if known. 1228 /// 1229 /// \returns A suitable array type, if there are no errors. Otherwise, 1230 /// returns a NULL type. 1231 QualType Sema::BuildArrayType(QualType T, ArrayType::ArraySizeModifier ASM, 1232 Expr *ArraySize, unsigned Quals, 1233 SourceRange Brackets, DeclarationName Entity) { 1234 1235 SourceLocation Loc = Brackets.getBegin(); 1236 if (getLangOpts().CPlusPlus) { 1237 // C++ [dcl.array]p1: 1238 // T is called the array element type; this type shall not be a reference 1239 // type, the (possibly cv-qualified) type void, a function type or an 1240 // abstract class type. 1241 // 1242 // Note: function types are handled in the common path with C. 1243 if (T->isReferenceType()) { 1244 Diag(Loc, diag::err_illegal_decl_array_of_references) 1245 << getPrintableNameForEntity(Entity) << T; 1246 return QualType(); 1247 } 1248 1249 if (T->isVoidType()) { 1250 Diag(Loc, diag::err_illegal_decl_array_incomplete_type) << T; 1251 return QualType(); 1252 } 1253 1254 if (RequireNonAbstractType(Brackets.getBegin(), T, 1255 diag::err_array_of_abstract_type)) 1256 return QualType(); 1257 1258 } else { 1259 // C99 6.7.5.2p1: If the element type is an incomplete or function type, 1260 // reject it (e.g. void ary[7], struct foo ary[7], void ary[7]()) 1261 if (RequireCompleteType(Loc, T, 1262 diag::err_illegal_decl_array_incomplete_type)) 1263 return QualType(); 1264 } 1265 1266 if (T->isFunctionType()) { 1267 Diag(Loc, diag::err_illegal_decl_array_of_functions) 1268 << getPrintableNameForEntity(Entity) << T; 1269 return QualType(); 1270 } 1271 1272 if (T->getContainedAutoType()) { 1273 Diag(Loc, diag::err_illegal_decl_array_of_auto) 1274 << getPrintableNameForEntity(Entity) << T; 1275 return QualType(); 1276 } 1277 1278 if (const RecordType *EltTy = T->getAs<RecordType>()) { 1279 // If the element type is a struct or union that contains a variadic 1280 // array, accept it as a GNU extension: C99 6.7.2.1p2. 1281 if (EltTy->getDecl()->hasFlexibleArrayMember()) 1282 Diag(Loc, diag::ext_flexible_array_in_array) << T; 1283 } else if (T->isObjCObjectType()) { 1284 Diag(Loc, diag::err_objc_array_of_interfaces) << T; 1285 return QualType(); 1286 } 1287 1288 // Do placeholder conversions on the array size expression. 1289 if (ArraySize && ArraySize->hasPlaceholderType()) { 1290 ExprResult Result = CheckPlaceholderExpr(ArraySize); 1291 if (Result.isInvalid()) return QualType(); 1292 ArraySize = Result.take(); 1293 } 1294 1295 // Do lvalue-to-rvalue conversions on the array size expression. 1296 if (ArraySize && !ArraySize->isRValue()) { 1297 ExprResult Result = DefaultLvalueConversion(ArraySize); 1298 if (Result.isInvalid()) 1299 return QualType(); 1300 1301 ArraySize = Result.take(); 1302 } 1303 1304 // C99 6.7.5.2p1: The size expression shall have integer type. 1305 // C++11 allows contextual conversions to such types. 1306 if (!getLangOpts().CPlusPlus0x && 1307 ArraySize && !ArraySize->isTypeDependent() && 1308 !ArraySize->getType()->isIntegralOrUnscopedEnumerationType()) { 1309 Diag(ArraySize->getLocStart(), diag::err_array_size_non_int) 1310 << ArraySize->getType() << ArraySize->getSourceRange(); 1311 return QualType(); 1312 } 1313 1314 llvm::APSInt ConstVal(Context.getTypeSize(Context.getSizeType())); 1315 if (!ArraySize) { 1316 if (ASM == ArrayType::Star) 1317 T = Context.getVariableArrayType(T, 0, ASM, Quals, Brackets); 1318 else 1319 T = Context.getIncompleteArrayType(T, ASM, Quals); 1320 } else if (ArraySize->isTypeDependent() || ArraySize->isValueDependent()) { 1321 T = Context.getDependentSizedArrayType(T, ArraySize, ASM, Quals, Brackets); 1322 } else if ((!T->isDependentType() && !T->isIncompleteType() && 1323 !T->isConstantSizeType()) || 1324 isArraySizeVLA(*this, ArraySize, ConstVal)) { 1325 // Even in C++11, don't allow contextual conversions in the array bound 1326 // of a VLA. 1327 if (getLangOpts().CPlusPlus0x && 1328 !ArraySize->getType()->isIntegralOrUnscopedEnumerationType()) { 1329 Diag(ArraySize->getLocStart(), diag::err_array_size_non_int) 1330 << ArraySize->getType() << ArraySize->getSourceRange(); 1331 return QualType(); 1332 } 1333 1334 // C99: an array with an element type that has a non-constant-size is a VLA. 1335 // C99: an array with a non-ICE size is a VLA. We accept any expression 1336 // that we can fold to a non-zero positive value as an extension. 1337 T = Context.getVariableArrayType(T, ArraySize, ASM, Quals, Brackets); 1338 } else { 1339 // C99 6.7.5.2p1: If the expression is a constant expression, it shall 1340 // have a value greater than zero. 1341 if (ConstVal.isSigned() && ConstVal.isNegative()) { 1342 if (Entity) 1343 Diag(ArraySize->getLocStart(), diag::err_decl_negative_array_size) 1344 << getPrintableNameForEntity(Entity) << ArraySize->getSourceRange(); 1345 else 1346 Diag(ArraySize->getLocStart(), diag::err_typecheck_negative_array_size) 1347 << ArraySize->getSourceRange(); 1348 return QualType(); 1349 } 1350 if (ConstVal == 0) { 1351 // GCC accepts zero sized static arrays. We allow them when 1352 // we're not in a SFINAE context. 1353 Diag(ArraySize->getLocStart(), 1354 isSFINAEContext()? diag::err_typecheck_zero_array_size 1355 : diag::ext_typecheck_zero_array_size) 1356 << ArraySize->getSourceRange(); 1357 1358 if (ASM == ArrayType::Static) { 1359 Diag(ArraySize->getLocStart(), 1360 diag::warn_typecheck_zero_static_array_size) 1361 << ArraySize->getSourceRange(); 1362 ASM = ArrayType::Normal; 1363 } 1364 } else if (!T->isDependentType() && !T->isVariablyModifiedType() && 1365 !T->isIncompleteType()) { 1366 // Is the array too large? 1367 unsigned ActiveSizeBits 1368 = ConstantArrayType::getNumAddressingBits(Context, T, ConstVal); 1369 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) 1370 Diag(ArraySize->getLocStart(), diag::err_array_too_large) 1371 << ConstVal.toString(10) 1372 << ArraySize->getSourceRange(); 1373 } 1374 1375 T = Context.getConstantArrayType(T, ConstVal, ASM, Quals); 1376 } 1377 // If this is not C99, extwarn about VLA's and C99 array size modifiers. 1378 if (!getLangOpts().C99) { 1379 if (T->isVariableArrayType()) { 1380 // Prohibit the use of non-POD types in VLAs. 1381 QualType BaseT = Context.getBaseElementType(T); 1382 if (!T->isDependentType() && 1383 !BaseT.isPODType(Context) && 1384 !BaseT->isObjCLifetimeType()) { 1385 Diag(Loc, diag::err_vla_non_pod) 1386 << BaseT; 1387 return QualType(); 1388 } 1389 // Prohibit the use of VLAs during template argument deduction. 1390 else if (isSFINAEContext()) { 1391 Diag(Loc, diag::err_vla_in_sfinae); 1392 return QualType(); 1393 } 1394 // Just extwarn about VLAs. 1395 else 1396 Diag(Loc, diag::ext_vla); 1397 } else if (ASM != ArrayType::Normal || Quals != 0) 1398 Diag(Loc, 1399 getLangOpts().CPlusPlus? diag::err_c99_array_usage_cxx 1400 : diag::ext_c99_array_usage) << ASM; 1401 } 1402 1403 return T; 1404 } 1405 1406 /// \brief Build an ext-vector type. 1407 /// 1408 /// Run the required checks for the extended vector type. 1409 QualType Sema::BuildExtVectorType(QualType T, Expr *ArraySize, 1410 SourceLocation AttrLoc) { 1411 // unlike gcc's vector_size attribute, we do not allow vectors to be defined 1412 // in conjunction with complex types (pointers, arrays, functions, etc.). 1413 if (!T->isDependentType() && 1414 !T->isIntegerType() && !T->isRealFloatingType()) { 1415 Diag(AttrLoc, diag::err_attribute_invalid_vector_type) << T; 1416 return QualType(); 1417 } 1418 1419 if (!ArraySize->isTypeDependent() && !ArraySize->isValueDependent()) { 1420 llvm::APSInt vecSize(32); 1421 if (!ArraySize->isIntegerConstantExpr(vecSize, Context)) { 1422 Diag(AttrLoc, diag::err_attribute_argument_not_int) 1423 << "ext_vector_type" << ArraySize->getSourceRange(); 1424 return QualType(); 1425 } 1426 1427 // unlike gcc's vector_size attribute, the size is specified as the 1428 // number of elements, not the number of bytes. 1429 unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue()); 1430 1431 if (vectorSize == 0) { 1432 Diag(AttrLoc, diag::err_attribute_zero_size) 1433 << ArraySize->getSourceRange(); 1434 return QualType(); 1435 } 1436 1437 return Context.getExtVectorType(T, vectorSize); 1438 } 1439 1440 return Context.getDependentSizedExtVectorType(T, ArraySize, AttrLoc); 1441 } 1442 1443 /// \brief Build a function type. 1444 /// 1445 /// This routine checks the function type according to C++ rules and 1446 /// under the assumption that the result type and parameter types have 1447 /// just been instantiated from a template. It therefore duplicates 1448 /// some of the behavior of GetTypeForDeclarator, but in a much 1449 /// simpler form that is only suitable for this narrow use case. 1450 /// 1451 /// \param T The return type of the function. 1452 /// 1453 /// \param ParamTypes The parameter types of the function. This array 1454 /// will be modified to account for adjustments to the types of the 1455 /// function parameters. 1456 /// 1457 /// \param NumParamTypes The number of parameter types in ParamTypes. 1458 /// 1459 /// \param Variadic Whether this is a variadic function type. 1460 /// 1461 /// \param HasTrailingReturn Whether this function has a trailing return type. 1462 /// 1463 /// \param Quals The cvr-qualifiers to be applied to the function type. 1464 /// 1465 /// \param Loc The location of the entity whose type involves this 1466 /// function type or, if there is no such entity, the location of the 1467 /// type that will have function type. 1468 /// 1469 /// \param Entity The name of the entity that involves the function 1470 /// type, if known. 1471 /// 1472 /// \returns A suitable function type, if there are no 1473 /// errors. Otherwise, returns a NULL type. 1474 QualType Sema::BuildFunctionType(QualType T, 1475 QualType *ParamTypes, 1476 unsigned NumParamTypes, 1477 bool Variadic, bool HasTrailingReturn, 1478 unsigned Quals, 1479 RefQualifierKind RefQualifier, 1480 SourceLocation Loc, DeclarationName Entity, 1481 FunctionType::ExtInfo Info) { 1482 if (T->isArrayType() || T->isFunctionType()) { 1483 Diag(Loc, diag::err_func_returning_array_function) 1484 << T->isFunctionType() << T; 1485 return QualType(); 1486 } 1487 1488 // Functions cannot return half FP. 1489 if (T->isHalfType()) { 1490 Diag(Loc, diag::err_parameters_retval_cannot_have_fp16_type) << 1 << 1491 FixItHint::CreateInsertion(Loc, "*"); 1492 return QualType(); 1493 } 1494 1495 bool Invalid = false; 1496 for (unsigned Idx = 0; Idx < NumParamTypes; ++Idx) { 1497 // FIXME: Loc is too inprecise here, should use proper locations for args. 1498 QualType ParamType = Context.getAdjustedParameterType(ParamTypes[Idx]); 1499 if (ParamType->isVoidType()) { 1500 Diag(Loc, diag::err_param_with_void_type); 1501 Invalid = true; 1502 } else if (ParamType->isHalfType()) { 1503 // Disallow half FP arguments. 1504 Diag(Loc, diag::err_parameters_retval_cannot_have_fp16_type) << 0 << 1505 FixItHint::CreateInsertion(Loc, "*"); 1506 Invalid = true; 1507 } 1508 1509 ParamTypes[Idx] = ParamType; 1510 } 1511 1512 if (Invalid) 1513 return QualType(); 1514 1515 FunctionProtoType::ExtProtoInfo EPI; 1516 EPI.Variadic = Variadic; 1517 EPI.HasTrailingReturn = HasTrailingReturn; 1518 EPI.TypeQuals = Quals; 1519 EPI.RefQualifier = RefQualifier; 1520 EPI.ExtInfo = Info; 1521 1522 return Context.getFunctionType(T, ParamTypes, NumParamTypes, EPI); 1523 } 1524 1525 /// \brief Build a member pointer type \c T Class::*. 1526 /// 1527 /// \param T the type to which the member pointer refers. 1528 /// \param Class the class type into which the member pointer points. 1529 /// \param Loc the location where this type begins 1530 /// \param Entity the name of the entity that will have this member pointer type 1531 /// 1532 /// \returns a member pointer type, if successful, or a NULL type if there was 1533 /// an error. 1534 QualType Sema::BuildMemberPointerType(QualType T, QualType Class, 1535 SourceLocation Loc, 1536 DeclarationName Entity) { 1537 // Verify that we're not building a pointer to pointer to function with 1538 // exception specification. 1539 if (CheckDistantExceptionSpec(T)) { 1540 Diag(Loc, diag::err_distant_exception_spec); 1541 1542 // FIXME: If we're doing this as part of template instantiation, 1543 // we should return immediately. 1544 1545 // Build the type anyway, but use the canonical type so that the 1546 // exception specifiers are stripped off. 1547 T = Context.getCanonicalType(T); 1548 } 1549 1550 // C++ 8.3.3p3: A pointer to member shall not point to ... a member 1551 // with reference type, or "cv void." 1552 if (T->isReferenceType()) { 1553 Diag(Loc, diag::err_illegal_decl_mempointer_to_reference) 1554 << (Entity? Entity.getAsString() : "type name") << T; 1555 return QualType(); 1556 } 1557 1558 if (T->isVoidType()) { 1559 Diag(Loc, diag::err_illegal_decl_mempointer_to_void) 1560 << (Entity? Entity.getAsString() : "type name"); 1561 return QualType(); 1562 } 1563 1564 if (!Class->isDependentType() && !Class->isRecordType()) { 1565 Diag(Loc, diag::err_mempointer_in_nonclass_type) << Class; 1566 return QualType(); 1567 } 1568 1569 // In the Microsoft ABI, the class is allowed to be an incomplete 1570 // type. In such cases, the compiler makes a worst-case assumption. 1571 // We make no such assumption right now, so emit an error if the 1572 // class isn't a complete type. 1573 if (Context.getTargetInfo().getCXXABI() == CXXABI_Microsoft && 1574 RequireCompleteType(Loc, Class, diag::err_incomplete_type)) 1575 return QualType(); 1576 1577 return Context.getMemberPointerType(T, Class.getTypePtr()); 1578 } 1579 1580 /// \brief Build a block pointer type. 1581 /// 1582 /// \param T The type to which we'll be building a block pointer. 1583 /// 1584 /// \param CVR The cvr-qualifiers to be applied to the block pointer type. 1585 /// 1586 /// \param Loc The location of the entity whose type involves this 1587 /// block pointer type or, if there is no such entity, the location of the 1588 /// type that will have block pointer type. 1589 /// 1590 /// \param Entity The name of the entity that involves the block pointer 1591 /// type, if known. 1592 /// 1593 /// \returns A suitable block pointer type, if there are no 1594 /// errors. Otherwise, returns a NULL type. 1595 QualType Sema::BuildBlockPointerType(QualType T, 1596 SourceLocation Loc, 1597 DeclarationName Entity) { 1598 if (!T->isFunctionType()) { 1599 Diag(Loc, diag::err_nonfunction_block_type); 1600 return QualType(); 1601 } 1602 1603 return Context.getBlockPointerType(T); 1604 } 1605 1606 QualType Sema::GetTypeFromParser(ParsedType Ty, TypeSourceInfo **TInfo) { 1607 QualType QT = Ty.get(); 1608 if (QT.isNull()) { 1609 if (TInfo) *TInfo = 0; 1610 return QualType(); 1611 } 1612 1613 TypeSourceInfo *DI = 0; 1614 if (const LocInfoType *LIT = dyn_cast<LocInfoType>(QT)) { 1615 QT = LIT->getType(); 1616 DI = LIT->getTypeSourceInfo(); 1617 } 1618 1619 if (TInfo) *TInfo = DI; 1620 return QT; 1621 } 1622 1623 static void transferARCOwnershipToDeclaratorChunk(TypeProcessingState &state, 1624 Qualifiers::ObjCLifetime ownership, 1625 unsigned chunkIndex); 1626 1627 /// Given that this is the declaration of a parameter under ARC, 1628 /// attempt to infer attributes and such for pointer-to-whatever 1629 /// types. 1630 static void inferARCWriteback(TypeProcessingState &state, 1631 QualType &declSpecType) { 1632 Sema &S = state.getSema(); 1633 Declarator &declarator = state.getDeclarator(); 1634 1635 // TODO: should we care about decl qualifiers? 1636 1637 // Check whether the declarator has the expected form. We walk 1638 // from the inside out in order to make the block logic work. 1639 unsigned outermostPointerIndex = 0; 1640 bool isBlockPointer = false; 1641 unsigned numPointers = 0; 1642 for (unsigned i = 0, e = declarator.getNumTypeObjects(); i != e; ++i) { 1643 unsigned chunkIndex = i; 1644 DeclaratorChunk &chunk = declarator.getTypeObject(chunkIndex); 1645 switch (chunk.Kind) { 1646 case DeclaratorChunk::Paren: 1647 // Ignore parens. 1648 break; 1649 1650 case DeclaratorChunk::Reference: 1651 case DeclaratorChunk::Pointer: 1652 // Count the number of pointers. Treat references 1653 // interchangeably as pointers; if they're mis-ordered, normal 1654 // type building will discover that. 1655 outermostPointerIndex = chunkIndex; 1656 numPointers++; 1657 break; 1658 1659 case DeclaratorChunk::BlockPointer: 1660 // If we have a pointer to block pointer, that's an acceptable 1661 // indirect reference; anything else is not an application of 1662 // the rules. 1663 if (numPointers != 1) return; 1664 numPointers++; 1665 outermostPointerIndex = chunkIndex; 1666 isBlockPointer = true; 1667 1668 // We don't care about pointer structure in return values here. 1669 goto done; 1670 1671 case DeclaratorChunk::Array: // suppress if written (id[])? 1672 case DeclaratorChunk::Function: 1673 case DeclaratorChunk::MemberPointer: 1674 return; 1675 } 1676 } 1677 done: 1678 1679 // If we have *one* pointer, then we want to throw the qualifier on 1680 // the declaration-specifiers, which means that it needs to be a 1681 // retainable object type. 1682 if (numPointers == 1) { 1683 // If it's not a retainable object type, the rule doesn't apply. 1684 if (!declSpecType->isObjCRetainableType()) return; 1685 1686 // If it already has lifetime, don't do anything. 1687 if (declSpecType.getObjCLifetime()) return; 1688 1689 // Otherwise, modify the type in-place. 1690 Qualifiers qs; 1691 1692 if (declSpecType->isObjCARCImplicitlyUnretainedType()) 1693 qs.addObjCLifetime(Qualifiers::OCL_ExplicitNone); 1694 else 1695 qs.addObjCLifetime(Qualifiers::OCL_Autoreleasing); 1696 declSpecType = S.Context.getQualifiedType(declSpecType, qs); 1697 1698 // If we have *two* pointers, then we want to throw the qualifier on 1699 // the outermost pointer. 1700 } else if (numPointers == 2) { 1701 // If we don't have a block pointer, we need to check whether the 1702 // declaration-specifiers gave us something that will turn into a 1703 // retainable object pointer after we slap the first pointer on it. 1704 if (!isBlockPointer && !declSpecType->isObjCObjectType()) 1705 return; 1706 1707 // Look for an explicit lifetime attribute there. 1708 DeclaratorChunk &chunk = declarator.getTypeObject(outermostPointerIndex); 1709 if (chunk.Kind != DeclaratorChunk::Pointer && 1710 chunk.Kind != DeclaratorChunk::BlockPointer) 1711 return; 1712 for (const AttributeList *attr = chunk.getAttrs(); attr; 1713 attr = attr->getNext()) 1714 if (attr->getKind() == AttributeList::AT_objc_ownership) 1715 return; 1716 1717 transferARCOwnershipToDeclaratorChunk(state, Qualifiers::OCL_Autoreleasing, 1718 outermostPointerIndex); 1719 1720 // Any other number of pointers/references does not trigger the rule. 1721 } else return; 1722 1723 // TODO: mark whether we did this inference? 1724 } 1725 1726 static void DiagnoseIgnoredQualifiers(unsigned Quals, 1727 SourceLocation ConstQualLoc, 1728 SourceLocation VolatileQualLoc, 1729 SourceLocation RestrictQualLoc, 1730 Sema& S) { 1731 std::string QualStr; 1732 unsigned NumQuals = 0; 1733 SourceLocation Loc; 1734 1735 FixItHint ConstFixIt; 1736 FixItHint VolatileFixIt; 1737 FixItHint RestrictFixIt; 1738 1739 const SourceManager &SM = S.getSourceManager(); 1740 1741 // FIXME: The locations here are set kind of arbitrarily. It'd be nicer to 1742 // find a range and grow it to encompass all the qualifiers, regardless of 1743 // the order in which they textually appear. 1744 if (Quals & Qualifiers::Const) { 1745 ConstFixIt = FixItHint::CreateRemoval(ConstQualLoc); 1746 QualStr = "const"; 1747 ++NumQuals; 1748 if (!Loc.isValid() || SM.isBeforeInTranslationUnit(ConstQualLoc, Loc)) 1749 Loc = ConstQualLoc; 1750 } 1751 if (Quals & Qualifiers::Volatile) { 1752 VolatileFixIt = FixItHint::CreateRemoval(VolatileQualLoc); 1753 QualStr += (NumQuals == 0 ? "volatile" : " volatile"); 1754 ++NumQuals; 1755 if (!Loc.isValid() || SM.isBeforeInTranslationUnit(VolatileQualLoc, Loc)) 1756 Loc = VolatileQualLoc; 1757 } 1758 if (Quals & Qualifiers::Restrict) { 1759 RestrictFixIt = FixItHint::CreateRemoval(RestrictQualLoc); 1760 QualStr += (NumQuals == 0 ? "restrict" : " restrict"); 1761 ++NumQuals; 1762 if (!Loc.isValid() || SM.isBeforeInTranslationUnit(RestrictQualLoc, Loc)) 1763 Loc = RestrictQualLoc; 1764 } 1765 1766 assert(NumQuals > 0 && "No known qualifiers?"); 1767 1768 S.Diag(Loc, diag::warn_qual_return_type) 1769 << QualStr << NumQuals << ConstFixIt << VolatileFixIt << RestrictFixIt; 1770 } 1771 1772 static QualType GetDeclSpecTypeForDeclarator(TypeProcessingState &state, 1773 TypeSourceInfo *&ReturnTypeInfo) { 1774 Sema &SemaRef = state.getSema(); 1775 Declarator &D = state.getDeclarator(); 1776 QualType T; 1777 ReturnTypeInfo = 0; 1778 1779 // The TagDecl owned by the DeclSpec. 1780 TagDecl *OwnedTagDecl = 0; 1781 1782 switch (D.getName().getKind()) { 1783 case UnqualifiedId::IK_ImplicitSelfParam: 1784 case UnqualifiedId::IK_OperatorFunctionId: 1785 case UnqualifiedId::IK_Identifier: 1786 case UnqualifiedId::IK_LiteralOperatorId: 1787 case UnqualifiedId::IK_TemplateId: 1788 T = ConvertDeclSpecToType(state); 1789 1790 if (!D.isInvalidType() && D.getDeclSpec().isTypeSpecOwned()) { 1791 OwnedTagDecl = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 1792 // Owned declaration is embedded in declarator. 1793 OwnedTagDecl->setEmbeddedInDeclarator(true); 1794 } 1795 break; 1796 1797 case UnqualifiedId::IK_ConstructorName: 1798 case UnqualifiedId::IK_ConstructorTemplateId: 1799 case UnqualifiedId::IK_DestructorName: 1800 // Constructors and destructors don't have return types. Use 1801 // "void" instead. 1802 T = SemaRef.Context.VoidTy; 1803 break; 1804 1805 case UnqualifiedId::IK_ConversionFunctionId: 1806 // The result type of a conversion function is the type that it 1807 // converts to. 1808 T = SemaRef.GetTypeFromParser(D.getName().ConversionFunctionId, 1809 &ReturnTypeInfo); 1810 break; 1811 } 1812 1813 if (D.getAttributes()) 1814 distributeTypeAttrsFromDeclarator(state, T); 1815 1816 // C++11 [dcl.spec.auto]p5: reject 'auto' if it is not in an allowed context. 1817 // In C++11, a function declarator using 'auto' must have a trailing return 1818 // type (this is checked later) and we can skip this. In other languages 1819 // using auto, we need to check regardless. 1820 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto && 1821 (!SemaRef.getLangOpts().CPlusPlus0x || !D.isFunctionDeclarator())) { 1822 int Error = -1; 1823 1824 switch (D.getContext()) { 1825 case Declarator::KNRTypeListContext: 1826 llvm_unreachable("K&R type lists aren't allowed in C++"); 1827 case Declarator::LambdaExprContext: 1828 llvm_unreachable("Can't specify a type specifier in lambda grammar"); 1829 case Declarator::ObjCParameterContext: 1830 case Declarator::ObjCResultContext: 1831 case Declarator::PrototypeContext: 1832 Error = 0; // Function prototype 1833 break; 1834 case Declarator::MemberContext: 1835 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_static) 1836 break; 1837 switch (cast<TagDecl>(SemaRef.CurContext)->getTagKind()) { 1838 case TTK_Enum: llvm_unreachable("unhandled tag kind"); 1839 case TTK_Struct: Error = 1; /* Struct member */ break; 1840 case TTK_Union: Error = 2; /* Union member */ break; 1841 case TTK_Class: Error = 3; /* Class member */ break; 1842 } 1843 break; 1844 case Declarator::CXXCatchContext: 1845 case Declarator::ObjCCatchContext: 1846 Error = 4; // Exception declaration 1847 break; 1848 case Declarator::TemplateParamContext: 1849 Error = 5; // Template parameter 1850 break; 1851 case Declarator::BlockLiteralContext: 1852 Error = 6; // Block literal 1853 break; 1854 case Declarator::TemplateTypeArgContext: 1855 Error = 7; // Template type argument 1856 break; 1857 case Declarator::AliasDeclContext: 1858 case Declarator::AliasTemplateContext: 1859 Error = 9; // Type alias 1860 break; 1861 case Declarator::TrailingReturnContext: 1862 Error = 10; // Function return type 1863 break; 1864 case Declarator::TypeNameContext: 1865 Error = 11; // Generic 1866 break; 1867 case Declarator::FileContext: 1868 case Declarator::BlockContext: 1869 case Declarator::ForContext: 1870 case Declarator::ConditionContext: 1871 case Declarator::CXXNewContext: 1872 break; 1873 } 1874 1875 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 1876 Error = 8; 1877 1878 // In Objective-C it is an error to use 'auto' on a function declarator. 1879 if (D.isFunctionDeclarator()) 1880 Error = 10; 1881 1882 // C++11 [dcl.spec.auto]p2: 'auto' is always fine if the declarator 1883 // contains a trailing return type. That is only legal at the outermost 1884 // level. Check all declarator chunks (outermost first) anyway, to give 1885 // better diagnostics. 1886 if (SemaRef.getLangOpts().CPlusPlus0x && Error != -1) { 1887 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 1888 unsigned chunkIndex = e - i - 1; 1889 state.setCurrentChunkIndex(chunkIndex); 1890 DeclaratorChunk &DeclType = D.getTypeObject(chunkIndex); 1891 if (DeclType.Kind == DeclaratorChunk::Function) { 1892 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun; 1893 if (FTI.TrailingReturnType) { 1894 Error = -1; 1895 break; 1896 } 1897 } 1898 } 1899 } 1900 1901 if (Error != -1) { 1902 SemaRef.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 1903 diag::err_auto_not_allowed) 1904 << Error; 1905 T = SemaRef.Context.IntTy; 1906 D.setInvalidType(true); 1907 } else 1908 SemaRef.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 1909 diag::warn_cxx98_compat_auto_type_specifier); 1910 } 1911 1912 if (SemaRef.getLangOpts().CPlusPlus && 1913 OwnedTagDecl && OwnedTagDecl->isCompleteDefinition()) { 1914 // Check the contexts where C++ forbids the declaration of a new class 1915 // or enumeration in a type-specifier-seq. 1916 switch (D.getContext()) { 1917 case Declarator::TrailingReturnContext: 1918 // Class and enumeration definitions are syntactically not allowed in 1919 // trailing return types. 1920 llvm_unreachable("parser should not have allowed this"); 1921 break; 1922 case Declarator::FileContext: 1923 case Declarator::MemberContext: 1924 case Declarator::BlockContext: 1925 case Declarator::ForContext: 1926 case Declarator::BlockLiteralContext: 1927 case Declarator::LambdaExprContext: 1928 // C++11 [dcl.type]p3: 1929 // A type-specifier-seq shall not define a class or enumeration unless 1930 // it appears in the type-id of an alias-declaration (7.1.3) that is not 1931 // the declaration of a template-declaration. 1932 case Declarator::AliasDeclContext: 1933 break; 1934 case Declarator::AliasTemplateContext: 1935 SemaRef.Diag(OwnedTagDecl->getLocation(), 1936 diag::err_type_defined_in_alias_template) 1937 << SemaRef.Context.getTypeDeclType(OwnedTagDecl); 1938 break; 1939 case Declarator::TypeNameContext: 1940 case Declarator::TemplateParamContext: 1941 case Declarator::CXXNewContext: 1942 case Declarator::CXXCatchContext: 1943 case Declarator::ObjCCatchContext: 1944 case Declarator::TemplateTypeArgContext: 1945 SemaRef.Diag(OwnedTagDecl->getLocation(), 1946 diag::err_type_defined_in_type_specifier) 1947 << SemaRef.Context.getTypeDeclType(OwnedTagDecl); 1948 break; 1949 case Declarator::PrototypeContext: 1950 case Declarator::ObjCParameterContext: 1951 case Declarator::ObjCResultContext: 1952 case Declarator::KNRTypeListContext: 1953 // C++ [dcl.fct]p6: 1954 // Types shall not be defined in return or parameter types. 1955 SemaRef.Diag(OwnedTagDecl->getLocation(), 1956 diag::err_type_defined_in_param_type) 1957 << SemaRef.Context.getTypeDeclType(OwnedTagDecl); 1958 break; 1959 case Declarator::ConditionContext: 1960 // C++ 6.4p2: 1961 // The type-specifier-seq shall not contain typedef and shall not declare 1962 // a new class or enumeration. 1963 SemaRef.Diag(OwnedTagDecl->getLocation(), 1964 diag::err_type_defined_in_condition); 1965 break; 1966 } 1967 } 1968 1969 return T; 1970 } 1971 1972 static std::string getFunctionQualifiersAsString(const FunctionProtoType *FnTy){ 1973 std::string Quals = 1974 Qualifiers::fromCVRMask(FnTy->getTypeQuals()).getAsString(); 1975 1976 switch (FnTy->getRefQualifier()) { 1977 case RQ_None: 1978 break; 1979 1980 case RQ_LValue: 1981 if (!Quals.empty()) 1982 Quals += ' '; 1983 Quals += '&'; 1984 break; 1985 1986 case RQ_RValue: 1987 if (!Quals.empty()) 1988 Quals += ' '; 1989 Quals += "&&"; 1990 break; 1991 } 1992 1993 return Quals; 1994 } 1995 1996 /// Check that the function type T, which has a cv-qualifier or a ref-qualifier, 1997 /// can be contained within the declarator chunk DeclType, and produce an 1998 /// appropriate diagnostic if not. 1999 static void checkQualifiedFunction(Sema &S, QualType T, 2000 DeclaratorChunk &DeclType) { 2001 // C++98 [dcl.fct]p4 / C++11 [dcl.fct]p6: a function type with a 2002 // cv-qualifier or a ref-qualifier can only appear at the topmost level 2003 // of a type. 2004 int DiagKind = -1; 2005 switch (DeclType.Kind) { 2006 case DeclaratorChunk::Paren: 2007 case DeclaratorChunk::MemberPointer: 2008 // These cases are permitted. 2009 return; 2010 case DeclaratorChunk::Array: 2011 case DeclaratorChunk::Function: 2012 // These cases don't allow function types at all; no need to diagnose the 2013 // qualifiers separately. 2014 return; 2015 case DeclaratorChunk::BlockPointer: 2016 DiagKind = 0; 2017 break; 2018 case DeclaratorChunk::Pointer: 2019 DiagKind = 1; 2020 break; 2021 case DeclaratorChunk::Reference: 2022 DiagKind = 2; 2023 break; 2024 } 2025 2026 assert(DiagKind != -1); 2027 S.Diag(DeclType.Loc, diag::err_compound_qualified_function_type) 2028 << DiagKind << isa<FunctionType>(T.IgnoreParens()) << T 2029 << getFunctionQualifiersAsString(T->castAs<FunctionProtoType>()); 2030 } 2031 2032 static TypeSourceInfo *GetFullTypeForDeclarator(TypeProcessingState &state, 2033 QualType declSpecType, 2034 TypeSourceInfo *TInfo) { 2035 2036 QualType T = declSpecType; 2037 Declarator &D = state.getDeclarator(); 2038 Sema &S = state.getSema(); 2039 ASTContext &Context = S.Context; 2040 const LangOptions &LangOpts = S.getLangOpts(); 2041 2042 bool ImplicitlyNoexcept = false; 2043 if (D.getName().getKind() == UnqualifiedId::IK_OperatorFunctionId && 2044 LangOpts.CPlusPlus0x) { 2045 OverloadedOperatorKind OO = D.getName().OperatorFunctionId.Operator; 2046 /// In C++0x, deallocation functions (normal and array operator delete) 2047 /// are implicitly noexcept. 2048 if (OO == OO_Delete || OO == OO_Array_Delete) 2049 ImplicitlyNoexcept = true; 2050 } 2051 2052 // The name we're declaring, if any. 2053 DeclarationName Name; 2054 if (D.getIdentifier()) 2055 Name = D.getIdentifier(); 2056 2057 // Does this declaration declare a typedef-name? 2058 bool IsTypedefName = 2059 D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef || 2060 D.getContext() == Declarator::AliasDeclContext || 2061 D.getContext() == Declarator::AliasTemplateContext; 2062 2063 // Does T refer to a function type with a cv-qualifier or a ref-qualifier? 2064 bool IsQualifiedFunction = T->isFunctionProtoType() && 2065 (T->castAs<FunctionProtoType>()->getTypeQuals() != 0 || 2066 T->castAs<FunctionProtoType>()->getRefQualifier() != RQ_None); 2067 2068 // Walk the DeclTypeInfo, building the recursive type as we go. 2069 // DeclTypeInfos are ordered from the identifier out, which is 2070 // opposite of what we want :). 2071 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 2072 unsigned chunkIndex = e - i - 1; 2073 state.setCurrentChunkIndex(chunkIndex); 2074 DeclaratorChunk &DeclType = D.getTypeObject(chunkIndex); 2075 if (IsQualifiedFunction) { 2076 checkQualifiedFunction(S, T, DeclType); 2077 IsQualifiedFunction = DeclType.Kind == DeclaratorChunk::Paren; 2078 } 2079 switch (DeclType.Kind) { 2080 case DeclaratorChunk::Paren: 2081 T = S.BuildParenType(T); 2082 break; 2083 case DeclaratorChunk::BlockPointer: 2084 // If blocks are disabled, emit an error. 2085 if (!LangOpts.Blocks) 2086 S.Diag(DeclType.Loc, diag::err_blocks_disable); 2087 2088 T = S.BuildBlockPointerType(T, D.getIdentifierLoc(), Name); 2089 if (DeclType.Cls.TypeQuals) 2090 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Cls.TypeQuals); 2091 break; 2092 case DeclaratorChunk::Pointer: 2093 // Verify that we're not building a pointer to pointer to function with 2094 // exception specification. 2095 if (LangOpts.CPlusPlus && S.CheckDistantExceptionSpec(T)) { 2096 S.Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 2097 D.setInvalidType(true); 2098 // Build the type anyway. 2099 } 2100 if (LangOpts.ObjC1 && T->getAs<ObjCObjectType>()) { 2101 T = Context.getObjCObjectPointerType(T); 2102 if (DeclType.Ptr.TypeQuals) 2103 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Ptr.TypeQuals); 2104 break; 2105 } 2106 T = S.BuildPointerType(T, DeclType.Loc, Name); 2107 if (DeclType.Ptr.TypeQuals) 2108 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Ptr.TypeQuals); 2109 2110 break; 2111 case DeclaratorChunk::Reference: { 2112 // Verify that we're not building a reference to pointer to function with 2113 // exception specification. 2114 if (LangOpts.CPlusPlus && S.CheckDistantExceptionSpec(T)) { 2115 S.Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 2116 D.setInvalidType(true); 2117 // Build the type anyway. 2118 } 2119 T = S.BuildReferenceType(T, DeclType.Ref.LValueRef, DeclType.Loc, Name); 2120 2121 Qualifiers Quals; 2122 if (DeclType.Ref.HasRestrict) 2123 T = S.BuildQualifiedType(T, DeclType.Loc, Qualifiers::Restrict); 2124 break; 2125 } 2126 case DeclaratorChunk::Array: { 2127 // Verify that we're not building an array of pointers to function with 2128 // exception specification. 2129 if (LangOpts.CPlusPlus && S.CheckDistantExceptionSpec(T)) { 2130 S.Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 2131 D.setInvalidType(true); 2132 // Build the type anyway. 2133 } 2134 DeclaratorChunk::ArrayTypeInfo &ATI = DeclType.Arr; 2135 Expr *ArraySize = static_cast<Expr*>(ATI.NumElts); 2136 ArrayType::ArraySizeModifier ASM; 2137 if (ATI.isStar) 2138 ASM = ArrayType::Star; 2139 else if (ATI.hasStatic) 2140 ASM = ArrayType::Static; 2141 else 2142 ASM = ArrayType::Normal; 2143 if (ASM == ArrayType::Star && !D.isPrototypeContext()) { 2144 // FIXME: This check isn't quite right: it allows star in prototypes 2145 // for function definitions, and disallows some edge cases detailed 2146 // in http://gcc.gnu.org/ml/gcc-patches/2009-02/msg00133.html 2147 S.Diag(DeclType.Loc, diag::err_array_star_outside_prototype); 2148 ASM = ArrayType::Normal; 2149 D.setInvalidType(true); 2150 } 2151 T = S.BuildArrayType(T, ASM, ArraySize, ATI.TypeQuals, 2152 SourceRange(DeclType.Loc, DeclType.EndLoc), Name); 2153 break; 2154 } 2155 case DeclaratorChunk::Function: { 2156 // If the function declarator has a prototype (i.e. it is not () and 2157 // does not have a K&R-style identifier list), then the arguments are part 2158 // of the type, otherwise the argument list is (). 2159 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun; 2160 IsQualifiedFunction = FTI.TypeQuals || FTI.hasRefQualifier(); 2161 2162 // Check for auto functions and trailing return type and adjust the 2163 // return type accordingly. 2164 if (!D.isInvalidType()) { 2165 // trailing-return-type is only required if we're declaring a function, 2166 // and not, for instance, a pointer to a function. 2167 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto && 2168 !FTI.TrailingReturnType && chunkIndex == 0) { 2169 S.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 2170 diag::err_auto_missing_trailing_return); 2171 T = Context.IntTy; 2172 D.setInvalidType(true); 2173 } else if (FTI.TrailingReturnType) { 2174 // T must be exactly 'auto' at this point. See CWG issue 681. 2175 if (isa<ParenType>(T)) { 2176 S.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 2177 diag::err_trailing_return_in_parens) 2178 << T << D.getDeclSpec().getSourceRange(); 2179 D.setInvalidType(true); 2180 } else if (D.getContext() != Declarator::LambdaExprContext && 2181 (T.hasQualifiers() || !isa<AutoType>(T))) { 2182 S.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 2183 diag::err_trailing_return_without_auto) 2184 << T << D.getDeclSpec().getSourceRange(); 2185 D.setInvalidType(true); 2186 } 2187 2188 T = S.GetTypeFromParser( 2189 ParsedType::getFromOpaquePtr(FTI.TrailingReturnType), 2190 &TInfo); 2191 } 2192 } 2193 2194 // C99 6.7.5.3p1: The return type may not be a function or array type. 2195 // For conversion functions, we'll diagnose this particular error later. 2196 if ((T->isArrayType() || T->isFunctionType()) && 2197 (D.getName().getKind() != UnqualifiedId::IK_ConversionFunctionId)) { 2198 unsigned diagID = diag::err_func_returning_array_function; 2199 // Last processing chunk in block context means this function chunk 2200 // represents the block. 2201 if (chunkIndex == 0 && 2202 D.getContext() == Declarator::BlockLiteralContext) 2203 diagID = diag::err_block_returning_array_function; 2204 S.Diag(DeclType.Loc, diagID) << T->isFunctionType() << T; 2205 T = Context.IntTy; 2206 D.setInvalidType(true); 2207 } 2208 2209 // Do not allow returning half FP value. 2210 // FIXME: This really should be in BuildFunctionType. 2211 if (T->isHalfType()) { 2212 S.Diag(D.getIdentifierLoc(), 2213 diag::err_parameters_retval_cannot_have_fp16_type) << 1 2214 << FixItHint::CreateInsertion(D.getIdentifierLoc(), "*"); 2215 D.setInvalidType(true); 2216 } 2217 2218 // cv-qualifiers on return types are pointless except when the type is a 2219 // class type in C++. 2220 if (isa<PointerType>(T) && T.getLocalCVRQualifiers() && 2221 (D.getName().getKind() != UnqualifiedId::IK_ConversionFunctionId) && 2222 (!LangOpts.CPlusPlus || !T->isDependentType())) { 2223 assert(chunkIndex + 1 < e && "No DeclaratorChunk for the return type?"); 2224 DeclaratorChunk ReturnTypeChunk = D.getTypeObject(chunkIndex + 1); 2225 assert(ReturnTypeChunk.Kind == DeclaratorChunk::Pointer); 2226 2227 DeclaratorChunk::PointerTypeInfo &PTI = ReturnTypeChunk.Ptr; 2228 2229 DiagnoseIgnoredQualifiers(PTI.TypeQuals, 2230 SourceLocation::getFromRawEncoding(PTI.ConstQualLoc), 2231 SourceLocation::getFromRawEncoding(PTI.VolatileQualLoc), 2232 SourceLocation::getFromRawEncoding(PTI.RestrictQualLoc), 2233 S); 2234 2235 } else if (T.getCVRQualifiers() && D.getDeclSpec().getTypeQualifiers() && 2236 (!LangOpts.CPlusPlus || 2237 (!T->isDependentType() && !T->isRecordType()))) { 2238 2239 DiagnoseIgnoredQualifiers(D.getDeclSpec().getTypeQualifiers(), 2240 D.getDeclSpec().getConstSpecLoc(), 2241 D.getDeclSpec().getVolatileSpecLoc(), 2242 D.getDeclSpec().getRestrictSpecLoc(), 2243 S); 2244 } 2245 2246 if (LangOpts.CPlusPlus && D.getDeclSpec().isTypeSpecOwned()) { 2247 // C++ [dcl.fct]p6: 2248 // Types shall not be defined in return or parameter types. 2249 TagDecl *Tag = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 2250 if (Tag->isCompleteDefinition()) 2251 S.Diag(Tag->getLocation(), diag::err_type_defined_in_result_type) 2252 << Context.getTypeDeclType(Tag); 2253 } 2254 2255 // Exception specs are not allowed in typedefs. Complain, but add it 2256 // anyway. 2257 if (IsTypedefName && FTI.getExceptionSpecType()) 2258 S.Diag(FTI.getExceptionSpecLoc(), diag::err_exception_spec_in_typedef) 2259 << (D.getContext() == Declarator::AliasDeclContext || 2260 D.getContext() == Declarator::AliasTemplateContext); 2261 2262 if (!FTI.NumArgs && !FTI.isVariadic && !LangOpts.CPlusPlus) { 2263 // Simple void foo(), where the incoming T is the result type. 2264 T = Context.getFunctionNoProtoType(T); 2265 } else { 2266 // We allow a zero-parameter variadic function in C if the 2267 // function is marked with the "overloadable" attribute. Scan 2268 // for this attribute now. 2269 if (!FTI.NumArgs && FTI.isVariadic && !LangOpts.CPlusPlus) { 2270 bool Overloadable = false; 2271 for (const AttributeList *Attrs = D.getAttributes(); 2272 Attrs; Attrs = Attrs->getNext()) { 2273 if (Attrs->getKind() == AttributeList::AT_overloadable) { 2274 Overloadable = true; 2275 break; 2276 } 2277 } 2278 2279 if (!Overloadable) 2280 S.Diag(FTI.getEllipsisLoc(), diag::err_ellipsis_first_arg); 2281 } 2282 2283 if (FTI.NumArgs && FTI.ArgInfo[0].Param == 0) { 2284 // C99 6.7.5.3p3: Reject int(x,y,z) when it's not a function 2285 // definition. 2286 S.Diag(FTI.ArgInfo[0].IdentLoc, diag::err_ident_list_in_fn_declaration); 2287 D.setInvalidType(true); 2288 break; 2289 } 2290 2291 FunctionProtoType::ExtProtoInfo EPI; 2292 EPI.Variadic = FTI.isVariadic; 2293 EPI.HasTrailingReturn = FTI.TrailingReturnType; 2294 EPI.TypeQuals = FTI.TypeQuals; 2295 EPI.RefQualifier = !FTI.hasRefQualifier()? RQ_None 2296 : FTI.RefQualifierIsLValueRef? RQ_LValue 2297 : RQ_RValue; 2298 2299 // Otherwise, we have a function with an argument list that is 2300 // potentially variadic. 2301 SmallVector<QualType, 16> ArgTys; 2302 ArgTys.reserve(FTI.NumArgs); 2303 2304 SmallVector<bool, 16> ConsumedArguments; 2305 ConsumedArguments.reserve(FTI.NumArgs); 2306 bool HasAnyConsumedArguments = false; 2307 2308 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 2309 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 2310 QualType ArgTy = Param->getType(); 2311 assert(!ArgTy.isNull() && "Couldn't parse type?"); 2312 2313 // Adjust the parameter type. 2314 assert((ArgTy == Context.getAdjustedParameterType(ArgTy)) && 2315 "Unadjusted type?"); 2316 2317 // Look for 'void'. void is allowed only as a single argument to a 2318 // function with no other parameters (C99 6.7.5.3p10). We record 2319 // int(void) as a FunctionProtoType with an empty argument list. 2320 if (ArgTy->isVoidType()) { 2321 // If this is something like 'float(int, void)', reject it. 'void' 2322 // is an incomplete type (C99 6.2.5p19) and function decls cannot 2323 // have arguments of incomplete type. 2324 if (FTI.NumArgs != 1 || FTI.isVariadic) { 2325 S.Diag(DeclType.Loc, diag::err_void_only_param); 2326 ArgTy = Context.IntTy; 2327 Param->setType(ArgTy); 2328 } else if (FTI.ArgInfo[i].Ident) { 2329 // Reject, but continue to parse 'int(void abc)'. 2330 S.Diag(FTI.ArgInfo[i].IdentLoc, 2331 diag::err_param_with_void_type); 2332 ArgTy = Context.IntTy; 2333 Param->setType(ArgTy); 2334 } else { 2335 // Reject, but continue to parse 'float(const void)'. 2336 if (ArgTy.hasQualifiers()) 2337 S.Diag(DeclType.Loc, diag::err_void_param_qualified); 2338 2339 // Do not add 'void' to the ArgTys list. 2340 break; 2341 } 2342 } else if (ArgTy->isHalfType()) { 2343 // Disallow half FP arguments. 2344 // FIXME: This really should be in BuildFunctionType. 2345 S.Diag(Param->getLocation(), 2346 diag::err_parameters_retval_cannot_have_fp16_type) << 0 2347 << FixItHint::CreateInsertion(Param->getLocation(), "*"); 2348 D.setInvalidType(); 2349 } else if (!FTI.hasPrototype) { 2350 if (ArgTy->isPromotableIntegerType()) { 2351 ArgTy = Context.getPromotedIntegerType(ArgTy); 2352 Param->setKNRPromoted(true); 2353 } else if (const BuiltinType* BTy = ArgTy->getAs<BuiltinType>()) { 2354 if (BTy->getKind() == BuiltinType::Float) { 2355 ArgTy = Context.DoubleTy; 2356 Param->setKNRPromoted(true); 2357 } 2358 } 2359 } 2360 2361 if (LangOpts.ObjCAutoRefCount) { 2362 bool Consumed = Param->hasAttr<NSConsumedAttr>(); 2363 ConsumedArguments.push_back(Consumed); 2364 HasAnyConsumedArguments |= Consumed; 2365 } 2366 2367 ArgTys.push_back(ArgTy); 2368 } 2369 2370 if (HasAnyConsumedArguments) 2371 EPI.ConsumedArguments = ConsumedArguments.data(); 2372 2373 SmallVector<QualType, 4> Exceptions; 2374 SmallVector<ParsedType, 2> DynamicExceptions; 2375 SmallVector<SourceRange, 2> DynamicExceptionRanges; 2376 Expr *NoexceptExpr = 0; 2377 2378 if (FTI.getExceptionSpecType() == EST_Dynamic) { 2379 // FIXME: It's rather inefficient to have to split into two vectors 2380 // here. 2381 unsigned N = FTI.NumExceptions; 2382 DynamicExceptions.reserve(N); 2383 DynamicExceptionRanges.reserve(N); 2384 for (unsigned I = 0; I != N; ++I) { 2385 DynamicExceptions.push_back(FTI.Exceptions[I].Ty); 2386 DynamicExceptionRanges.push_back(FTI.Exceptions[I].Range); 2387 } 2388 } else if (FTI.getExceptionSpecType() == EST_ComputedNoexcept) { 2389 NoexceptExpr = FTI.NoexceptExpr; 2390 } 2391 2392 S.checkExceptionSpecification(FTI.getExceptionSpecType(), 2393 DynamicExceptions, 2394 DynamicExceptionRanges, 2395 NoexceptExpr, 2396 Exceptions, 2397 EPI); 2398 2399 if (FTI.getExceptionSpecType() == EST_None && 2400 ImplicitlyNoexcept && chunkIndex == 0) { 2401 // Only the outermost chunk is marked noexcept, of course. 2402 EPI.ExceptionSpecType = EST_BasicNoexcept; 2403 } 2404 2405 T = Context.getFunctionType(T, ArgTys.data(), ArgTys.size(), EPI); 2406 } 2407 2408 break; 2409 } 2410 case DeclaratorChunk::MemberPointer: 2411 // The scope spec must refer to a class, or be dependent. 2412 CXXScopeSpec &SS = DeclType.Mem.Scope(); 2413 QualType ClsType; 2414 if (SS.isInvalid()) { 2415 // Avoid emitting extra errors if we already errored on the scope. 2416 D.setInvalidType(true); 2417 } else if (S.isDependentScopeSpecifier(SS) || 2418 dyn_cast_or_null<CXXRecordDecl>(S.computeDeclContext(SS))) { 2419 NestedNameSpecifier *NNS 2420 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 2421 NestedNameSpecifier *NNSPrefix = NNS->getPrefix(); 2422 switch (NNS->getKind()) { 2423 case NestedNameSpecifier::Identifier: 2424 ClsType = Context.getDependentNameType(ETK_None, NNSPrefix, 2425 NNS->getAsIdentifier()); 2426 break; 2427 2428 case NestedNameSpecifier::Namespace: 2429 case NestedNameSpecifier::NamespaceAlias: 2430 case NestedNameSpecifier::Global: 2431 llvm_unreachable("Nested-name-specifier must name a type"); 2432 2433 case NestedNameSpecifier::TypeSpec: 2434 case NestedNameSpecifier::TypeSpecWithTemplate: 2435 ClsType = QualType(NNS->getAsType(), 0); 2436 // Note: if the NNS has a prefix and ClsType is a nondependent 2437 // TemplateSpecializationType, then the NNS prefix is NOT included 2438 // in ClsType; hence we wrap ClsType into an ElaboratedType. 2439 // NOTE: in particular, no wrap occurs if ClsType already is an 2440 // Elaborated, DependentName, or DependentTemplateSpecialization. 2441 if (NNSPrefix && isa<TemplateSpecializationType>(NNS->getAsType())) 2442 ClsType = Context.getElaboratedType(ETK_None, NNSPrefix, ClsType); 2443 break; 2444 } 2445 } else { 2446 S.Diag(DeclType.Mem.Scope().getBeginLoc(), 2447 diag::err_illegal_decl_mempointer_in_nonclass) 2448 << (D.getIdentifier() ? D.getIdentifier()->getName() : "type name") 2449 << DeclType.Mem.Scope().getRange(); 2450 D.setInvalidType(true); 2451 } 2452 2453 if (!ClsType.isNull()) 2454 T = S.BuildMemberPointerType(T, ClsType, DeclType.Loc, D.getIdentifier()); 2455 if (T.isNull()) { 2456 T = Context.IntTy; 2457 D.setInvalidType(true); 2458 } else if (DeclType.Mem.TypeQuals) { 2459 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Mem.TypeQuals); 2460 } 2461 break; 2462 } 2463 2464 if (T.isNull()) { 2465 D.setInvalidType(true); 2466 T = Context.IntTy; 2467 } 2468 2469 // See if there are any attributes on this declarator chunk. 2470 if (AttributeList *attrs = const_cast<AttributeList*>(DeclType.getAttrs())) 2471 processTypeAttrs(state, T, false, attrs); 2472 } 2473 2474 if (LangOpts.CPlusPlus && T->isFunctionType()) { 2475 const FunctionProtoType *FnTy = T->getAs<FunctionProtoType>(); 2476 assert(FnTy && "Why oh why is there not a FunctionProtoType here?"); 2477 2478 // C++ 8.3.5p4: 2479 // A cv-qualifier-seq shall only be part of the function type 2480 // for a nonstatic member function, the function type to which a pointer 2481 // to member refers, or the top-level function type of a function typedef 2482 // declaration. 2483 // 2484 // Core issue 547 also allows cv-qualifiers on function types that are 2485 // top-level template type arguments. 2486 bool FreeFunction; 2487 if (!D.getCXXScopeSpec().isSet()) { 2488 FreeFunction = ((D.getContext() != Declarator::MemberContext && 2489 D.getContext() != Declarator::LambdaExprContext) || 2490 D.getDeclSpec().isFriendSpecified()); 2491 } else { 2492 DeclContext *DC = S.computeDeclContext(D.getCXXScopeSpec()); 2493 FreeFunction = (DC && !DC->isRecord()); 2494 } 2495 2496 // C++0x [dcl.constexpr]p8: A constexpr specifier for a non-static member 2497 // function that is not a constructor declares that function to be const. 2498 if (D.getDeclSpec().isConstexprSpecified() && !FreeFunction && 2499 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static && 2500 D.getName().getKind() != UnqualifiedId::IK_ConstructorName && 2501 D.getName().getKind() != UnqualifiedId::IK_ConstructorTemplateId && 2502 !(FnTy->getTypeQuals() & DeclSpec::TQ_const)) { 2503 // Rebuild function type adding a 'const' qualifier. 2504 FunctionProtoType::ExtProtoInfo EPI = FnTy->getExtProtoInfo(); 2505 EPI.TypeQuals |= DeclSpec::TQ_const; 2506 T = Context.getFunctionType(FnTy->getResultType(), 2507 FnTy->arg_type_begin(), 2508 FnTy->getNumArgs(), EPI); 2509 } 2510 2511 // C++11 [dcl.fct]p6 (w/DR1417): 2512 // An attempt to specify a function type with a cv-qualifier-seq or a 2513 // ref-qualifier (including by typedef-name) is ill-formed unless it is: 2514 // - the function type for a non-static member function, 2515 // - the function type to which a pointer to member refers, 2516 // - the top-level function type of a function typedef declaration or 2517 // alias-declaration, 2518 // - the type-id in the default argument of a type-parameter, or 2519 // - the type-id of a template-argument for a type-parameter 2520 if (IsQualifiedFunction && 2521 !(!FreeFunction && 2522 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) && 2523 !IsTypedefName && 2524 D.getContext() != Declarator::TemplateTypeArgContext) { 2525 SourceLocation Loc = D.getLocStart(); 2526 SourceRange RemovalRange; 2527 unsigned I; 2528 if (D.isFunctionDeclarator(I)) { 2529 SmallVector<SourceLocation, 4> RemovalLocs; 2530 const DeclaratorChunk &Chunk = D.getTypeObject(I); 2531 assert(Chunk.Kind == DeclaratorChunk::Function); 2532 if (Chunk.Fun.hasRefQualifier()) 2533 RemovalLocs.push_back(Chunk.Fun.getRefQualifierLoc()); 2534 if (Chunk.Fun.TypeQuals & Qualifiers::Const) 2535 RemovalLocs.push_back(Chunk.Fun.getConstQualifierLoc()); 2536 if (Chunk.Fun.TypeQuals & Qualifiers::Volatile) 2537 RemovalLocs.push_back(Chunk.Fun.getVolatileQualifierLoc()); 2538 // FIXME: We do not track the location of the __restrict qualifier. 2539 //if (Chunk.Fun.TypeQuals & Qualifiers::Restrict) 2540 // RemovalLocs.push_back(Chunk.Fun.getRestrictQualifierLoc()); 2541 if (!RemovalLocs.empty()) { 2542 std::sort(RemovalLocs.begin(), RemovalLocs.end(), 2543 SourceManager::LocBeforeThanCompare(S.getSourceManager())); 2544 RemovalRange = SourceRange(RemovalLocs.front(), RemovalLocs.back()); 2545 Loc = RemovalLocs.front(); 2546 } 2547 } 2548 2549 S.Diag(Loc, diag::err_invalid_qualified_function_type) 2550 << FreeFunction << D.isFunctionDeclarator() << T 2551 << getFunctionQualifiersAsString(FnTy) 2552 << FixItHint::CreateRemoval(RemovalRange); 2553 2554 // Strip the cv-qualifiers and ref-qualifiers from the type. 2555 FunctionProtoType::ExtProtoInfo EPI = FnTy->getExtProtoInfo(); 2556 EPI.TypeQuals = 0; 2557 EPI.RefQualifier = RQ_None; 2558 2559 T = Context.getFunctionType(FnTy->getResultType(), 2560 FnTy->arg_type_begin(), 2561 FnTy->getNumArgs(), EPI); 2562 } 2563 } 2564 2565 // Apply any undistributed attributes from the declarator. 2566 if (!T.isNull()) 2567 if (AttributeList *attrs = D.getAttributes()) 2568 processTypeAttrs(state, T, false, attrs); 2569 2570 // Diagnose any ignored type attributes. 2571 if (!T.isNull()) state.diagnoseIgnoredTypeAttrs(T); 2572 2573 // C++0x [dcl.constexpr]p9: 2574 // A constexpr specifier used in an object declaration declares the object 2575 // as const. 2576 if (D.getDeclSpec().isConstexprSpecified() && T->isObjectType()) { 2577 T.addConst(); 2578 } 2579 2580 // If there was an ellipsis in the declarator, the declaration declares a 2581 // parameter pack whose type may be a pack expansion type. 2582 if (D.hasEllipsis() && !T.isNull()) { 2583 // C++0x [dcl.fct]p13: 2584 // A declarator-id or abstract-declarator containing an ellipsis shall 2585 // only be used in a parameter-declaration. Such a parameter-declaration 2586 // is a parameter pack (14.5.3). [...] 2587 switch (D.getContext()) { 2588 case Declarator::PrototypeContext: 2589 // C++0x [dcl.fct]p13: 2590 // [...] When it is part of a parameter-declaration-clause, the 2591 // parameter pack is a function parameter pack (14.5.3). The type T 2592 // of the declarator-id of the function parameter pack shall contain 2593 // a template parameter pack; each template parameter pack in T is 2594 // expanded by the function parameter pack. 2595 // 2596 // We represent function parameter packs as function parameters whose 2597 // type is a pack expansion. 2598 if (!T->containsUnexpandedParameterPack()) { 2599 S.Diag(D.getEllipsisLoc(), 2600 diag::err_function_parameter_pack_without_parameter_packs) 2601 << T << D.getSourceRange(); 2602 D.setEllipsisLoc(SourceLocation()); 2603 } else { 2604 T = Context.getPackExpansionType(T, llvm::Optional<unsigned>()); 2605 } 2606 break; 2607 2608 case Declarator::TemplateParamContext: 2609 // C++0x [temp.param]p15: 2610 // If a template-parameter is a [...] is a parameter-declaration that 2611 // declares a parameter pack (8.3.5), then the template-parameter is a 2612 // template parameter pack (14.5.3). 2613 // 2614 // Note: core issue 778 clarifies that, if there are any unexpanded 2615 // parameter packs in the type of the non-type template parameter, then 2616 // it expands those parameter packs. 2617 if (T->containsUnexpandedParameterPack()) 2618 T = Context.getPackExpansionType(T, llvm::Optional<unsigned>()); 2619 else 2620 S.Diag(D.getEllipsisLoc(), 2621 LangOpts.CPlusPlus0x 2622 ? diag::warn_cxx98_compat_variadic_templates 2623 : diag::ext_variadic_templates); 2624 break; 2625 2626 case Declarator::FileContext: 2627 case Declarator::KNRTypeListContext: 2628 case Declarator::ObjCParameterContext: // FIXME: special diagnostic here? 2629 case Declarator::ObjCResultContext: // FIXME: special diagnostic here? 2630 case Declarator::TypeNameContext: 2631 case Declarator::CXXNewContext: 2632 case Declarator::AliasDeclContext: 2633 case Declarator::AliasTemplateContext: 2634 case Declarator::MemberContext: 2635 case Declarator::BlockContext: 2636 case Declarator::ForContext: 2637 case Declarator::ConditionContext: 2638 case Declarator::CXXCatchContext: 2639 case Declarator::ObjCCatchContext: 2640 case Declarator::BlockLiteralContext: 2641 case Declarator::LambdaExprContext: 2642 case Declarator::TrailingReturnContext: 2643 case Declarator::TemplateTypeArgContext: 2644 // FIXME: We may want to allow parameter packs in block-literal contexts 2645 // in the future. 2646 S.Diag(D.getEllipsisLoc(), diag::err_ellipsis_in_declarator_not_parameter); 2647 D.setEllipsisLoc(SourceLocation()); 2648 break; 2649 } 2650 } 2651 2652 if (T.isNull()) 2653 return Context.getNullTypeSourceInfo(); 2654 else if (D.isInvalidType()) 2655 return Context.getTrivialTypeSourceInfo(T); 2656 2657 return S.GetTypeSourceInfoForDeclarator(D, T, TInfo); 2658 } 2659 2660 /// GetTypeForDeclarator - Convert the type for the specified 2661 /// declarator to Type instances. 2662 /// 2663 /// The result of this call will never be null, but the associated 2664 /// type may be a null type if there's an unrecoverable error. 2665 TypeSourceInfo *Sema::GetTypeForDeclarator(Declarator &D, Scope *S) { 2666 // Determine the type of the declarator. Not all forms of declarator 2667 // have a type. 2668 2669 TypeProcessingState state(*this, D); 2670 2671 TypeSourceInfo *ReturnTypeInfo = 0; 2672 QualType T = GetDeclSpecTypeForDeclarator(state, ReturnTypeInfo); 2673 if (T.isNull()) 2674 return Context.getNullTypeSourceInfo(); 2675 2676 if (D.isPrototypeContext() && getLangOpts().ObjCAutoRefCount) 2677 inferARCWriteback(state, T); 2678 2679 return GetFullTypeForDeclarator(state, T, ReturnTypeInfo); 2680 } 2681 2682 static void transferARCOwnershipToDeclSpec(Sema &S, 2683 QualType &declSpecTy, 2684 Qualifiers::ObjCLifetime ownership) { 2685 if (declSpecTy->isObjCRetainableType() && 2686 declSpecTy.getObjCLifetime() == Qualifiers::OCL_None) { 2687 Qualifiers qs; 2688 qs.addObjCLifetime(ownership); 2689 declSpecTy = S.Context.getQualifiedType(declSpecTy, qs); 2690 } 2691 } 2692 2693 static void transferARCOwnershipToDeclaratorChunk(TypeProcessingState &state, 2694 Qualifiers::ObjCLifetime ownership, 2695 unsigned chunkIndex) { 2696 Sema &S = state.getSema(); 2697 Declarator &D = state.getDeclarator(); 2698 2699 // Look for an explicit lifetime attribute. 2700 DeclaratorChunk &chunk = D.getTypeObject(chunkIndex); 2701 for (const AttributeList *attr = chunk.getAttrs(); attr; 2702 attr = attr->getNext()) 2703 if (attr->getKind() == AttributeList::AT_objc_ownership) 2704 return; 2705 2706 const char *attrStr = 0; 2707 switch (ownership) { 2708 case Qualifiers::OCL_None: llvm_unreachable("no ownership!"); 2709 case Qualifiers::OCL_ExplicitNone: attrStr = "none"; break; 2710 case Qualifiers::OCL_Strong: attrStr = "strong"; break; 2711 case Qualifiers::OCL_Weak: attrStr = "weak"; break; 2712 case Qualifiers::OCL_Autoreleasing: attrStr = "autoreleasing"; break; 2713 } 2714 2715 // If there wasn't one, add one (with an invalid source location 2716 // so that we don't make an AttributedType for it). 2717 AttributeList *attr = D.getAttributePool() 2718 .create(&S.Context.Idents.get("objc_ownership"), SourceLocation(), 2719 /*scope*/ 0, SourceLocation(), 2720 &S.Context.Idents.get(attrStr), SourceLocation(), 2721 /*args*/ 0, 0, 2722 /*declspec*/ false, /*C++0x*/ false); 2723 spliceAttrIntoList(*attr, chunk.getAttrListRef()); 2724 2725 // TODO: mark whether we did this inference? 2726 } 2727 2728 /// \brief Used for transfering ownership in casts resulting in l-values. 2729 static void transferARCOwnership(TypeProcessingState &state, 2730 QualType &declSpecTy, 2731 Qualifiers::ObjCLifetime ownership) { 2732 Sema &S = state.getSema(); 2733 Declarator &D = state.getDeclarator(); 2734 2735 int inner = -1; 2736 bool hasIndirection = false; 2737 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 2738 DeclaratorChunk &chunk = D.getTypeObject(i); 2739 switch (chunk.Kind) { 2740 case DeclaratorChunk::Paren: 2741 // Ignore parens. 2742 break; 2743 2744 case DeclaratorChunk::Array: 2745 case DeclaratorChunk::Reference: 2746 case DeclaratorChunk::Pointer: 2747 if (inner != -1) 2748 hasIndirection = true; 2749 inner = i; 2750 break; 2751 2752 case DeclaratorChunk::BlockPointer: 2753 if (inner != -1) 2754 transferARCOwnershipToDeclaratorChunk(state, ownership, i); 2755 return; 2756 2757 case DeclaratorChunk::Function: 2758 case DeclaratorChunk::MemberPointer: 2759 return; 2760 } 2761 } 2762 2763 if (inner == -1) 2764 return; 2765 2766 DeclaratorChunk &chunk = D.getTypeObject(inner); 2767 if (chunk.Kind == DeclaratorChunk::Pointer) { 2768 if (declSpecTy->isObjCRetainableType()) 2769 return transferARCOwnershipToDeclSpec(S, declSpecTy, ownership); 2770 if (declSpecTy->isObjCObjectType() && hasIndirection) 2771 return transferARCOwnershipToDeclaratorChunk(state, ownership, inner); 2772 } else { 2773 assert(chunk.Kind == DeclaratorChunk::Array || 2774 chunk.Kind == DeclaratorChunk::Reference); 2775 return transferARCOwnershipToDeclSpec(S, declSpecTy, ownership); 2776 } 2777 } 2778 2779 TypeSourceInfo *Sema::GetTypeForDeclaratorCast(Declarator &D, QualType FromTy) { 2780 TypeProcessingState state(*this, D); 2781 2782 TypeSourceInfo *ReturnTypeInfo = 0; 2783 QualType declSpecTy = GetDeclSpecTypeForDeclarator(state, ReturnTypeInfo); 2784 if (declSpecTy.isNull()) 2785 return Context.getNullTypeSourceInfo(); 2786 2787 if (getLangOpts().ObjCAutoRefCount) { 2788 Qualifiers::ObjCLifetime ownership = Context.getInnerObjCOwnership(FromTy); 2789 if (ownership != Qualifiers::OCL_None) 2790 transferARCOwnership(state, declSpecTy, ownership); 2791 } 2792 2793 return GetFullTypeForDeclarator(state, declSpecTy, ReturnTypeInfo); 2794 } 2795 2796 /// Map an AttributedType::Kind to an AttributeList::Kind. 2797 static AttributeList::Kind getAttrListKind(AttributedType::Kind kind) { 2798 switch (kind) { 2799 case AttributedType::attr_address_space: 2800 return AttributeList::AT_address_space; 2801 case AttributedType::attr_regparm: 2802 return AttributeList::AT_regparm; 2803 case AttributedType::attr_vector_size: 2804 return AttributeList::AT_vector_size; 2805 case AttributedType::attr_neon_vector_type: 2806 return AttributeList::AT_neon_vector_type; 2807 case AttributedType::attr_neon_polyvector_type: 2808 return AttributeList::AT_neon_polyvector_type; 2809 case AttributedType::attr_objc_gc: 2810 return AttributeList::AT_objc_gc; 2811 case AttributedType::attr_objc_ownership: 2812 return AttributeList::AT_objc_ownership; 2813 case AttributedType::attr_noreturn: 2814 return AttributeList::AT_noreturn; 2815 case AttributedType::attr_cdecl: 2816 return AttributeList::AT_cdecl; 2817 case AttributedType::attr_fastcall: 2818 return AttributeList::AT_fastcall; 2819 case AttributedType::attr_stdcall: 2820 return AttributeList::AT_stdcall; 2821 case AttributedType::attr_thiscall: 2822 return AttributeList::AT_thiscall; 2823 case AttributedType::attr_pascal: 2824 return AttributeList::AT_pascal; 2825 case AttributedType::attr_pcs: 2826 return AttributeList::AT_pcs; 2827 } 2828 llvm_unreachable("unexpected attribute kind!"); 2829 } 2830 2831 static void fillAttributedTypeLoc(AttributedTypeLoc TL, 2832 const AttributeList *attrs) { 2833 AttributedType::Kind kind = TL.getAttrKind(); 2834 2835 assert(attrs && "no type attributes in the expected location!"); 2836 AttributeList::Kind parsedKind = getAttrListKind(kind); 2837 while (attrs->getKind() != parsedKind) { 2838 attrs = attrs->getNext(); 2839 assert(attrs && "no matching attribute in expected location!"); 2840 } 2841 2842 TL.setAttrNameLoc(attrs->getLoc()); 2843 if (TL.hasAttrExprOperand()) 2844 TL.setAttrExprOperand(attrs->getArg(0)); 2845 else if (TL.hasAttrEnumOperand()) 2846 TL.setAttrEnumOperandLoc(attrs->getParameterLoc()); 2847 2848 // FIXME: preserve this information to here. 2849 if (TL.hasAttrOperand()) 2850 TL.setAttrOperandParensRange(SourceRange()); 2851 } 2852 2853 namespace { 2854 class TypeSpecLocFiller : public TypeLocVisitor<TypeSpecLocFiller> { 2855 ASTContext &Context; 2856 const DeclSpec &DS; 2857 2858 public: 2859 TypeSpecLocFiller(ASTContext &Context, const DeclSpec &DS) 2860 : Context(Context), DS(DS) {} 2861 2862 void VisitAttributedTypeLoc(AttributedTypeLoc TL) { 2863 fillAttributedTypeLoc(TL, DS.getAttributes().getList()); 2864 Visit(TL.getModifiedLoc()); 2865 } 2866 void VisitQualifiedTypeLoc(QualifiedTypeLoc TL) { 2867 Visit(TL.getUnqualifiedLoc()); 2868 } 2869 void VisitTypedefTypeLoc(TypedefTypeLoc TL) { 2870 TL.setNameLoc(DS.getTypeSpecTypeLoc()); 2871 } 2872 void VisitObjCInterfaceTypeLoc(ObjCInterfaceTypeLoc TL) { 2873 TL.setNameLoc(DS.getTypeSpecTypeLoc()); 2874 } 2875 void VisitObjCObjectTypeLoc(ObjCObjectTypeLoc TL) { 2876 // Handle the base type, which might not have been written explicitly. 2877 if (DS.getTypeSpecType() == DeclSpec::TST_unspecified) { 2878 TL.setHasBaseTypeAsWritten(false); 2879 TL.getBaseLoc().initialize(Context, SourceLocation()); 2880 } else { 2881 TL.setHasBaseTypeAsWritten(true); 2882 Visit(TL.getBaseLoc()); 2883 } 2884 2885 // Protocol qualifiers. 2886 if (DS.getProtocolQualifiers()) { 2887 assert(TL.getNumProtocols() > 0); 2888 assert(TL.getNumProtocols() == DS.getNumProtocolQualifiers()); 2889 TL.setLAngleLoc(DS.getProtocolLAngleLoc()); 2890 TL.setRAngleLoc(DS.getSourceRange().getEnd()); 2891 for (unsigned i = 0, e = DS.getNumProtocolQualifiers(); i != e; ++i) 2892 TL.setProtocolLoc(i, DS.getProtocolLocs()[i]); 2893 } else { 2894 assert(TL.getNumProtocols() == 0); 2895 TL.setLAngleLoc(SourceLocation()); 2896 TL.setRAngleLoc(SourceLocation()); 2897 } 2898 } 2899 void VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL) { 2900 TL.setStarLoc(SourceLocation()); 2901 Visit(TL.getPointeeLoc()); 2902 } 2903 void VisitTemplateSpecializationTypeLoc(TemplateSpecializationTypeLoc TL) { 2904 TypeSourceInfo *TInfo = 0; 2905 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 2906 2907 // If we got no declarator info from previous Sema routines, 2908 // just fill with the typespec loc. 2909 if (!TInfo) { 2910 TL.initialize(Context, DS.getTypeSpecTypeNameLoc()); 2911 return; 2912 } 2913 2914 TypeLoc OldTL = TInfo->getTypeLoc(); 2915 if (TInfo->getType()->getAs<ElaboratedType>()) { 2916 ElaboratedTypeLoc ElabTL = cast<ElaboratedTypeLoc>(OldTL); 2917 TemplateSpecializationTypeLoc NamedTL = 2918 cast<TemplateSpecializationTypeLoc>(ElabTL.getNamedTypeLoc()); 2919 TL.copy(NamedTL); 2920 } 2921 else 2922 TL.copy(cast<TemplateSpecializationTypeLoc>(OldTL)); 2923 } 2924 void VisitTypeOfExprTypeLoc(TypeOfExprTypeLoc TL) { 2925 assert(DS.getTypeSpecType() == DeclSpec::TST_typeofExpr); 2926 TL.setTypeofLoc(DS.getTypeSpecTypeLoc()); 2927 TL.setParensRange(DS.getTypeofParensRange()); 2928 } 2929 void VisitTypeOfTypeLoc(TypeOfTypeLoc TL) { 2930 assert(DS.getTypeSpecType() == DeclSpec::TST_typeofType); 2931 TL.setTypeofLoc(DS.getTypeSpecTypeLoc()); 2932 TL.setParensRange(DS.getTypeofParensRange()); 2933 assert(DS.getRepAsType()); 2934 TypeSourceInfo *TInfo = 0; 2935 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 2936 TL.setUnderlyingTInfo(TInfo); 2937 } 2938 void VisitUnaryTransformTypeLoc(UnaryTransformTypeLoc TL) { 2939 // FIXME: This holds only because we only have one unary transform. 2940 assert(DS.getTypeSpecType() == DeclSpec::TST_underlyingType); 2941 TL.setKWLoc(DS.getTypeSpecTypeLoc()); 2942 TL.setParensRange(DS.getTypeofParensRange()); 2943 assert(DS.getRepAsType()); 2944 TypeSourceInfo *TInfo = 0; 2945 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 2946 TL.setUnderlyingTInfo(TInfo); 2947 } 2948 void VisitBuiltinTypeLoc(BuiltinTypeLoc TL) { 2949 // By default, use the source location of the type specifier. 2950 TL.setBuiltinLoc(DS.getTypeSpecTypeLoc()); 2951 if (TL.needsExtraLocalData()) { 2952 // Set info for the written builtin specifiers. 2953 TL.getWrittenBuiltinSpecs() = DS.getWrittenBuiltinSpecs(); 2954 // Try to have a meaningful source location. 2955 if (TL.getWrittenSignSpec() != TSS_unspecified) 2956 // Sign spec loc overrides the others (e.g., 'unsigned long'). 2957 TL.setBuiltinLoc(DS.getTypeSpecSignLoc()); 2958 else if (TL.getWrittenWidthSpec() != TSW_unspecified) 2959 // Width spec loc overrides type spec loc (e.g., 'short int'). 2960 TL.setBuiltinLoc(DS.getTypeSpecWidthLoc()); 2961 } 2962 } 2963 void VisitElaboratedTypeLoc(ElaboratedTypeLoc TL) { 2964 ElaboratedTypeKeyword Keyword 2965 = TypeWithKeyword::getKeywordForTypeSpec(DS.getTypeSpecType()); 2966 if (DS.getTypeSpecType() == TST_typename) { 2967 TypeSourceInfo *TInfo = 0; 2968 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 2969 if (TInfo) { 2970 TL.copy(cast<ElaboratedTypeLoc>(TInfo->getTypeLoc())); 2971 return; 2972 } 2973 } 2974 TL.setElaboratedKeywordLoc(Keyword != ETK_None 2975 ? DS.getTypeSpecTypeLoc() 2976 : SourceLocation()); 2977 const CXXScopeSpec& SS = DS.getTypeSpecScope(); 2978 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 2979 Visit(TL.getNextTypeLoc().getUnqualifiedLoc()); 2980 } 2981 void VisitDependentNameTypeLoc(DependentNameTypeLoc TL) { 2982 assert(DS.getTypeSpecType() == TST_typename); 2983 TypeSourceInfo *TInfo = 0; 2984 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 2985 assert(TInfo); 2986 TL.copy(cast<DependentNameTypeLoc>(TInfo->getTypeLoc())); 2987 } 2988 void VisitDependentTemplateSpecializationTypeLoc( 2989 DependentTemplateSpecializationTypeLoc TL) { 2990 assert(DS.getTypeSpecType() == TST_typename); 2991 TypeSourceInfo *TInfo = 0; 2992 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 2993 assert(TInfo); 2994 TL.copy(cast<DependentTemplateSpecializationTypeLoc>( 2995 TInfo->getTypeLoc())); 2996 } 2997 void VisitTagTypeLoc(TagTypeLoc TL) { 2998 TL.setNameLoc(DS.getTypeSpecTypeNameLoc()); 2999 } 3000 void VisitAtomicTypeLoc(AtomicTypeLoc TL) { 3001 TL.setKWLoc(DS.getTypeSpecTypeLoc()); 3002 TL.setParensRange(DS.getTypeofParensRange()); 3003 3004 TypeSourceInfo *TInfo = 0; 3005 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 3006 TL.getValueLoc().initializeFullCopy(TInfo->getTypeLoc()); 3007 } 3008 3009 void VisitTypeLoc(TypeLoc TL) { 3010 // FIXME: add other typespec types and change this to an assert. 3011 TL.initialize(Context, DS.getTypeSpecTypeLoc()); 3012 } 3013 }; 3014 3015 class DeclaratorLocFiller : public TypeLocVisitor<DeclaratorLocFiller> { 3016 ASTContext &Context; 3017 const DeclaratorChunk &Chunk; 3018 3019 public: 3020 DeclaratorLocFiller(ASTContext &Context, const DeclaratorChunk &Chunk) 3021 : Context(Context), Chunk(Chunk) {} 3022 3023 void VisitQualifiedTypeLoc(QualifiedTypeLoc TL) { 3024 llvm_unreachable("qualified type locs not expected here!"); 3025 } 3026 3027 void VisitAttributedTypeLoc(AttributedTypeLoc TL) { 3028 fillAttributedTypeLoc(TL, Chunk.getAttrs()); 3029 } 3030 void VisitBlockPointerTypeLoc(BlockPointerTypeLoc TL) { 3031 assert(Chunk.Kind == DeclaratorChunk::BlockPointer); 3032 TL.setCaretLoc(Chunk.Loc); 3033 } 3034 void VisitPointerTypeLoc(PointerTypeLoc TL) { 3035 assert(Chunk.Kind == DeclaratorChunk::Pointer); 3036 TL.setStarLoc(Chunk.Loc); 3037 } 3038 void VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL) { 3039 assert(Chunk.Kind == DeclaratorChunk::Pointer); 3040 TL.setStarLoc(Chunk.Loc); 3041 } 3042 void VisitMemberPointerTypeLoc(MemberPointerTypeLoc TL) { 3043 assert(Chunk.Kind == DeclaratorChunk::MemberPointer); 3044 const CXXScopeSpec& SS = Chunk.Mem.Scope(); 3045 NestedNameSpecifierLoc NNSLoc = SS.getWithLocInContext(Context); 3046 3047 const Type* ClsTy = TL.getClass(); 3048 QualType ClsQT = QualType(ClsTy, 0); 3049 TypeSourceInfo *ClsTInfo = Context.CreateTypeSourceInfo(ClsQT, 0); 3050 // Now copy source location info into the type loc component. 3051 TypeLoc ClsTL = ClsTInfo->getTypeLoc(); 3052 switch (NNSLoc.getNestedNameSpecifier()->getKind()) { 3053 case NestedNameSpecifier::Identifier: 3054 assert(isa<DependentNameType>(ClsTy) && "Unexpected TypeLoc"); 3055 { 3056 DependentNameTypeLoc DNTLoc = cast<DependentNameTypeLoc>(ClsTL); 3057 DNTLoc.setElaboratedKeywordLoc(SourceLocation()); 3058 DNTLoc.setQualifierLoc(NNSLoc.getPrefix()); 3059 DNTLoc.setNameLoc(NNSLoc.getLocalBeginLoc()); 3060 } 3061 break; 3062 3063 case NestedNameSpecifier::TypeSpec: 3064 case NestedNameSpecifier::TypeSpecWithTemplate: 3065 if (isa<ElaboratedType>(ClsTy)) { 3066 ElaboratedTypeLoc ETLoc = *cast<ElaboratedTypeLoc>(&ClsTL); 3067 ETLoc.setElaboratedKeywordLoc(SourceLocation()); 3068 ETLoc.setQualifierLoc(NNSLoc.getPrefix()); 3069 TypeLoc NamedTL = ETLoc.getNamedTypeLoc(); 3070 NamedTL.initializeFullCopy(NNSLoc.getTypeLoc()); 3071 } else { 3072 ClsTL.initializeFullCopy(NNSLoc.getTypeLoc()); 3073 } 3074 break; 3075 3076 case NestedNameSpecifier::Namespace: 3077 case NestedNameSpecifier::NamespaceAlias: 3078 case NestedNameSpecifier::Global: 3079 llvm_unreachable("Nested-name-specifier must name a type"); 3080 } 3081 3082 // Finally fill in MemberPointerLocInfo fields. 3083 TL.setStarLoc(Chunk.Loc); 3084 TL.setClassTInfo(ClsTInfo); 3085 } 3086 void VisitLValueReferenceTypeLoc(LValueReferenceTypeLoc TL) { 3087 assert(Chunk.Kind == DeclaratorChunk::Reference); 3088 // 'Amp' is misleading: this might have been originally 3089 /// spelled with AmpAmp. 3090 TL.setAmpLoc(Chunk.Loc); 3091 } 3092 void VisitRValueReferenceTypeLoc(RValueReferenceTypeLoc TL) { 3093 assert(Chunk.Kind == DeclaratorChunk::Reference); 3094 assert(!Chunk.Ref.LValueRef); 3095 TL.setAmpAmpLoc(Chunk.Loc); 3096 } 3097 void VisitArrayTypeLoc(ArrayTypeLoc TL) { 3098 assert(Chunk.Kind == DeclaratorChunk::Array); 3099 TL.setLBracketLoc(Chunk.Loc); 3100 TL.setRBracketLoc(Chunk.EndLoc); 3101 TL.setSizeExpr(static_cast<Expr*>(Chunk.Arr.NumElts)); 3102 } 3103 void VisitFunctionTypeLoc(FunctionTypeLoc TL) { 3104 assert(Chunk.Kind == DeclaratorChunk::Function); 3105 TL.setLocalRangeBegin(Chunk.Loc); 3106 TL.setLocalRangeEnd(Chunk.EndLoc); 3107 TL.setTrailingReturn(!!Chunk.Fun.TrailingReturnType); 3108 3109 const DeclaratorChunk::FunctionTypeInfo &FTI = Chunk.Fun; 3110 for (unsigned i = 0, e = TL.getNumArgs(), tpi = 0; i != e; ++i) { 3111 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 3112 TL.setArg(tpi++, Param); 3113 } 3114 // FIXME: exception specs 3115 } 3116 void VisitParenTypeLoc(ParenTypeLoc TL) { 3117 assert(Chunk.Kind == DeclaratorChunk::Paren); 3118 TL.setLParenLoc(Chunk.Loc); 3119 TL.setRParenLoc(Chunk.EndLoc); 3120 } 3121 3122 void VisitTypeLoc(TypeLoc TL) { 3123 llvm_unreachable("unsupported TypeLoc kind in declarator!"); 3124 } 3125 }; 3126 } 3127 3128 /// \brief Create and instantiate a TypeSourceInfo with type source information. 3129 /// 3130 /// \param T QualType referring to the type as written in source code. 3131 /// 3132 /// \param ReturnTypeInfo For declarators whose return type does not show 3133 /// up in the normal place in the declaration specifiers (such as a C++ 3134 /// conversion function), this pointer will refer to a type source information 3135 /// for that return type. 3136 TypeSourceInfo * 3137 Sema::GetTypeSourceInfoForDeclarator(Declarator &D, QualType T, 3138 TypeSourceInfo *ReturnTypeInfo) { 3139 TypeSourceInfo *TInfo = Context.CreateTypeSourceInfo(T); 3140 UnqualTypeLoc CurrTL = TInfo->getTypeLoc().getUnqualifiedLoc(); 3141 3142 // Handle parameter packs whose type is a pack expansion. 3143 if (isa<PackExpansionType>(T)) { 3144 cast<PackExpansionTypeLoc>(CurrTL).setEllipsisLoc(D.getEllipsisLoc()); 3145 CurrTL = CurrTL.getNextTypeLoc().getUnqualifiedLoc(); 3146 } 3147 3148 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 3149 while (isa<AttributedTypeLoc>(CurrTL)) { 3150 AttributedTypeLoc TL = cast<AttributedTypeLoc>(CurrTL); 3151 fillAttributedTypeLoc(TL, D.getTypeObject(i).getAttrs()); 3152 CurrTL = TL.getNextTypeLoc().getUnqualifiedLoc(); 3153 } 3154 3155 DeclaratorLocFiller(Context, D.getTypeObject(i)).Visit(CurrTL); 3156 CurrTL = CurrTL.getNextTypeLoc().getUnqualifiedLoc(); 3157 } 3158 3159 // If we have different source information for the return type, use 3160 // that. This really only applies to C++ conversion functions. 3161 if (ReturnTypeInfo) { 3162 TypeLoc TL = ReturnTypeInfo->getTypeLoc(); 3163 assert(TL.getFullDataSize() == CurrTL.getFullDataSize()); 3164 memcpy(CurrTL.getOpaqueData(), TL.getOpaqueData(), TL.getFullDataSize()); 3165 } else { 3166 TypeSpecLocFiller(Context, D.getDeclSpec()).Visit(CurrTL); 3167 } 3168 3169 return TInfo; 3170 } 3171 3172 /// \brief Create a LocInfoType to hold the given QualType and TypeSourceInfo. 3173 ParsedType Sema::CreateParsedType(QualType T, TypeSourceInfo *TInfo) { 3174 // FIXME: LocInfoTypes are "transient", only needed for passing to/from Parser 3175 // and Sema during declaration parsing. Try deallocating/caching them when 3176 // it's appropriate, instead of allocating them and keeping them around. 3177 LocInfoType *LocT = (LocInfoType*)BumpAlloc.Allocate(sizeof(LocInfoType), 3178 TypeAlignment); 3179 new (LocT) LocInfoType(T, TInfo); 3180 assert(LocT->getTypeClass() != T->getTypeClass() && 3181 "LocInfoType's TypeClass conflicts with an existing Type class"); 3182 return ParsedType::make(QualType(LocT, 0)); 3183 } 3184 3185 void LocInfoType::getAsStringInternal(std::string &Str, 3186 const PrintingPolicy &Policy) const { 3187 llvm_unreachable("LocInfoType leaked into the type system; an opaque TypeTy*" 3188 " was used directly instead of getting the QualType through" 3189 " GetTypeFromParser"); 3190 } 3191 3192 TypeResult Sema::ActOnTypeName(Scope *S, Declarator &D) { 3193 // C99 6.7.6: Type names have no identifier. This is already validated by 3194 // the parser. 3195 assert(D.getIdentifier() == 0 && "Type name should have no identifier!"); 3196 3197 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 3198 QualType T = TInfo->getType(); 3199 if (D.isInvalidType()) 3200 return true; 3201 3202 // Make sure there are no unused decl attributes on the declarator. 3203 // We don't want to do this for ObjC parameters because we're going 3204 // to apply them to the actual parameter declaration. 3205 if (D.getContext() != Declarator::ObjCParameterContext) 3206 checkUnusedDeclAttributes(D); 3207 3208 if (getLangOpts().CPlusPlus) { 3209 // Check that there are no default arguments (C++ only). 3210 CheckExtraCXXDefaultArguments(D); 3211 } 3212 3213 return CreateParsedType(T, TInfo); 3214 } 3215 3216 ParsedType Sema::ActOnObjCInstanceType(SourceLocation Loc) { 3217 QualType T = Context.getObjCInstanceType(); 3218 TypeSourceInfo *TInfo = Context.getTrivialTypeSourceInfo(T, Loc); 3219 return CreateParsedType(T, TInfo); 3220 } 3221 3222 3223 //===----------------------------------------------------------------------===// 3224 // Type Attribute Processing 3225 //===----------------------------------------------------------------------===// 3226 3227 /// HandleAddressSpaceTypeAttribute - Process an address_space attribute on the 3228 /// specified type. The attribute contains 1 argument, the id of the address 3229 /// space for the type. 3230 static void HandleAddressSpaceTypeAttribute(QualType &Type, 3231 const AttributeList &Attr, Sema &S){ 3232 3233 // If this type is already address space qualified, reject it. 3234 // ISO/IEC TR 18037 S5.3 (amending C99 6.7.3): "No type shall be qualified by 3235 // qualifiers for two or more different address spaces." 3236 if (Type.getAddressSpace()) { 3237 S.Diag(Attr.getLoc(), diag::err_attribute_address_multiple_qualifiers); 3238 Attr.setInvalid(); 3239 return; 3240 } 3241 3242 // ISO/IEC TR 18037 S5.3 (amending C99 6.7.3): "A function type shall not be 3243 // qualified by an address-space qualifier." 3244 if (Type->isFunctionType()) { 3245 S.Diag(Attr.getLoc(), diag::err_attribute_address_function_type); 3246 Attr.setInvalid(); 3247 return; 3248 } 3249 3250 // Check the attribute arguments. 3251 if (Attr.getNumArgs() != 1) { 3252 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 3253 Attr.setInvalid(); 3254 return; 3255 } 3256 Expr *ASArgExpr = static_cast<Expr *>(Attr.getArg(0)); 3257 llvm::APSInt addrSpace(32); 3258 if (ASArgExpr->isTypeDependent() || ASArgExpr->isValueDependent() || 3259 !ASArgExpr->isIntegerConstantExpr(addrSpace, S.Context)) { 3260 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_not_int) 3261 << ASArgExpr->getSourceRange(); 3262 Attr.setInvalid(); 3263 return; 3264 } 3265 3266 // Bounds checking. 3267 if (addrSpace.isSigned()) { 3268 if (addrSpace.isNegative()) { 3269 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_negative) 3270 << ASArgExpr->getSourceRange(); 3271 Attr.setInvalid(); 3272 return; 3273 } 3274 addrSpace.setIsSigned(false); 3275 } 3276 llvm::APSInt max(addrSpace.getBitWidth()); 3277 max = Qualifiers::MaxAddressSpace; 3278 if (addrSpace > max) { 3279 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_too_high) 3280 << Qualifiers::MaxAddressSpace << ASArgExpr->getSourceRange(); 3281 Attr.setInvalid(); 3282 return; 3283 } 3284 3285 unsigned ASIdx = static_cast<unsigned>(addrSpace.getZExtValue()); 3286 Type = S.Context.getAddrSpaceQualType(Type, ASIdx); 3287 } 3288 3289 /// Does this type have a "direct" ownership qualifier? That is, 3290 /// is it written like "__strong id", as opposed to something like 3291 /// "typeof(foo)", where that happens to be strong? 3292 static bool hasDirectOwnershipQualifier(QualType type) { 3293 // Fast path: no qualifier at all. 3294 assert(type.getQualifiers().hasObjCLifetime()); 3295 3296 while (true) { 3297 // __strong id 3298 if (const AttributedType *attr = dyn_cast<AttributedType>(type)) { 3299 if (attr->getAttrKind() == AttributedType::attr_objc_ownership) 3300 return true; 3301 3302 type = attr->getModifiedType(); 3303 3304 // X *__strong (...) 3305 } else if (const ParenType *paren = dyn_cast<ParenType>(type)) { 3306 type = paren->getInnerType(); 3307 3308 // That's it for things we want to complain about. In particular, 3309 // we do not want to look through typedefs, typeof(expr), 3310 // typeof(type), or any other way that the type is somehow 3311 // abstracted. 3312 } else { 3313 3314 return false; 3315 } 3316 } 3317 } 3318 3319 /// handleObjCOwnershipTypeAttr - Process an objc_ownership 3320 /// attribute on the specified type. 3321 /// 3322 /// Returns 'true' if the attribute was handled. 3323 static bool handleObjCOwnershipTypeAttr(TypeProcessingState &state, 3324 AttributeList &attr, 3325 QualType &type) { 3326 bool NonObjCPointer = false; 3327 3328 if (!type->isDependentType()) { 3329 if (const PointerType *ptr = type->getAs<PointerType>()) { 3330 QualType pointee = ptr->getPointeeType(); 3331 if (pointee->isObjCRetainableType() || pointee->isPointerType()) 3332 return false; 3333 // It is important not to lose the source info that there was an attribute 3334 // applied to non-objc pointer. We will create an attributed type but 3335 // its type will be the same as the original type. 3336 NonObjCPointer = true; 3337 } else if (!type->isObjCRetainableType()) { 3338 return false; 3339 } 3340 } 3341 3342 Sema &S = state.getSema(); 3343 SourceLocation AttrLoc = attr.getLoc(); 3344 if (AttrLoc.isMacroID()) 3345 AttrLoc = S.getSourceManager().getImmediateExpansionRange(AttrLoc).first; 3346 3347 if (!attr.getParameterName()) { 3348 S.Diag(AttrLoc, diag::err_attribute_argument_n_not_string) 3349 << "objc_ownership" << 1; 3350 attr.setInvalid(); 3351 return true; 3352 } 3353 3354 // Consume lifetime attributes without further comment outside of 3355 // ARC mode. 3356 if (!S.getLangOpts().ObjCAutoRefCount) 3357 return true; 3358 3359 Qualifiers::ObjCLifetime lifetime; 3360 if (attr.getParameterName()->isStr("none")) 3361 lifetime = Qualifiers::OCL_ExplicitNone; 3362 else if (attr.getParameterName()->isStr("strong")) 3363 lifetime = Qualifiers::OCL_Strong; 3364 else if (attr.getParameterName()->isStr("weak")) 3365 lifetime = Qualifiers::OCL_Weak; 3366 else if (attr.getParameterName()->isStr("autoreleasing")) 3367 lifetime = Qualifiers::OCL_Autoreleasing; 3368 else { 3369 S.Diag(AttrLoc, diag::warn_attribute_type_not_supported) 3370 << "objc_ownership" << attr.getParameterName(); 3371 attr.setInvalid(); 3372 return true; 3373 } 3374 3375 SplitQualType underlyingType = type.split(); 3376 3377 // Check for redundant/conflicting ownership qualifiers. 3378 if (Qualifiers::ObjCLifetime previousLifetime 3379 = type.getQualifiers().getObjCLifetime()) { 3380 // If it's written directly, that's an error. 3381 if (hasDirectOwnershipQualifier(type)) { 3382 S.Diag(AttrLoc, diag::err_attr_objc_ownership_redundant) 3383 << type; 3384 return true; 3385 } 3386 3387 // Otherwise, if the qualifiers actually conflict, pull sugar off 3388 // until we reach a type that is directly qualified. 3389 if (previousLifetime != lifetime) { 3390 // This should always terminate: the canonical type is 3391 // qualified, so some bit of sugar must be hiding it. 3392 while (!underlyingType.Quals.hasObjCLifetime()) { 3393 underlyingType = underlyingType.getSingleStepDesugaredType(); 3394 } 3395 underlyingType.Quals.removeObjCLifetime(); 3396 } 3397 } 3398 3399 underlyingType.Quals.addObjCLifetime(lifetime); 3400 3401 if (NonObjCPointer) { 3402 StringRef name = attr.getName()->getName(); 3403 switch (lifetime) { 3404 case Qualifiers::OCL_None: 3405 case Qualifiers::OCL_ExplicitNone: 3406 break; 3407 case Qualifiers::OCL_Strong: name = "__strong"; break; 3408 case Qualifiers::OCL_Weak: name = "__weak"; break; 3409 case Qualifiers::OCL_Autoreleasing: name = "__autoreleasing"; break; 3410 } 3411 S.Diag(AttrLoc, diag::warn_objc_object_attribute_wrong_type) 3412 << name << type; 3413 } 3414 3415 QualType origType = type; 3416 if (!NonObjCPointer) 3417 type = S.Context.getQualifiedType(underlyingType); 3418 3419 // If we have a valid source location for the attribute, use an 3420 // AttributedType instead. 3421 if (AttrLoc.isValid()) 3422 type = S.Context.getAttributedType(AttributedType::attr_objc_ownership, 3423 origType, type); 3424 3425 // Forbid __weak if the runtime doesn't support it. 3426 if (lifetime == Qualifiers::OCL_Weak && 3427 !S.getLangOpts().ObjCRuntimeHasWeak && !NonObjCPointer) { 3428 3429 // Actually, delay this until we know what we're parsing. 3430 if (S.DelayedDiagnostics.shouldDelayDiagnostics()) { 3431 S.DelayedDiagnostics.add( 3432 sema::DelayedDiagnostic::makeForbiddenType( 3433 S.getSourceManager().getExpansionLoc(AttrLoc), 3434 diag::err_arc_weak_no_runtime, type, /*ignored*/ 0)); 3435 } else { 3436 S.Diag(AttrLoc, diag::err_arc_weak_no_runtime); 3437 } 3438 3439 attr.setInvalid(); 3440 return true; 3441 } 3442 3443 // Forbid __weak for class objects marked as 3444 // objc_arc_weak_reference_unavailable 3445 if (lifetime == Qualifiers::OCL_Weak) { 3446 QualType T = type; 3447 while (const PointerType *ptr = T->getAs<PointerType>()) 3448 T = ptr->getPointeeType(); 3449 if (const ObjCObjectPointerType *ObjT = T->getAs<ObjCObjectPointerType>()) { 3450 ObjCInterfaceDecl *Class = ObjT->getInterfaceDecl(); 3451 if (Class->isArcWeakrefUnavailable()) { 3452 S.Diag(AttrLoc, diag::err_arc_unsupported_weak_class); 3453 S.Diag(ObjT->getInterfaceDecl()->getLocation(), 3454 diag::note_class_declared); 3455 } 3456 } 3457 } 3458 3459 return true; 3460 } 3461 3462 /// handleObjCGCTypeAttr - Process the __attribute__((objc_gc)) type 3463 /// attribute on the specified type. Returns true to indicate that 3464 /// the attribute was handled, false to indicate that the type does 3465 /// not permit the attribute. 3466 static bool handleObjCGCTypeAttr(TypeProcessingState &state, 3467 AttributeList &attr, 3468 QualType &type) { 3469 Sema &S = state.getSema(); 3470 3471 // Delay if this isn't some kind of pointer. 3472 if (!type->isPointerType() && 3473 !type->isObjCObjectPointerType() && 3474 !type->isBlockPointerType()) 3475 return false; 3476 3477 if (type.getObjCGCAttr() != Qualifiers::GCNone) { 3478 S.Diag(attr.getLoc(), diag::err_attribute_multiple_objc_gc); 3479 attr.setInvalid(); 3480 return true; 3481 } 3482 3483 // Check the attribute arguments. 3484 if (!attr.getParameterName()) { 3485 S.Diag(attr.getLoc(), diag::err_attribute_argument_n_not_string) 3486 << "objc_gc" << 1; 3487 attr.setInvalid(); 3488 return true; 3489 } 3490 Qualifiers::GC GCAttr; 3491 if (attr.getNumArgs() != 0) { 3492 S.Diag(attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 3493 attr.setInvalid(); 3494 return true; 3495 } 3496 if (attr.getParameterName()->isStr("weak")) 3497 GCAttr = Qualifiers::Weak; 3498 else if (attr.getParameterName()->isStr("strong")) 3499 GCAttr = Qualifiers::Strong; 3500 else { 3501 S.Diag(attr.getLoc(), diag::warn_attribute_type_not_supported) 3502 << "objc_gc" << attr.getParameterName(); 3503 attr.setInvalid(); 3504 return true; 3505 } 3506 3507 QualType origType = type; 3508 type = S.Context.getObjCGCQualType(origType, GCAttr); 3509 3510 // Make an attributed type to preserve the source information. 3511 if (attr.getLoc().isValid()) 3512 type = S.Context.getAttributedType(AttributedType::attr_objc_gc, 3513 origType, type); 3514 3515 return true; 3516 } 3517 3518 namespace { 3519 /// A helper class to unwrap a type down to a function for the 3520 /// purposes of applying attributes there. 3521 /// 3522 /// Use: 3523 /// FunctionTypeUnwrapper unwrapped(SemaRef, T); 3524 /// if (unwrapped.isFunctionType()) { 3525 /// const FunctionType *fn = unwrapped.get(); 3526 /// // change fn somehow 3527 /// T = unwrapped.wrap(fn); 3528 /// } 3529 struct FunctionTypeUnwrapper { 3530 enum WrapKind { 3531 Desugar, 3532 Parens, 3533 Pointer, 3534 BlockPointer, 3535 Reference, 3536 MemberPointer 3537 }; 3538 3539 QualType Original; 3540 const FunctionType *Fn; 3541 SmallVector<unsigned char /*WrapKind*/, 8> Stack; 3542 3543 FunctionTypeUnwrapper(Sema &S, QualType T) : Original(T) { 3544 while (true) { 3545 const Type *Ty = T.getTypePtr(); 3546 if (isa<FunctionType>(Ty)) { 3547 Fn = cast<FunctionType>(Ty); 3548 return; 3549 } else if (isa<ParenType>(Ty)) { 3550 T = cast<ParenType>(Ty)->getInnerType(); 3551 Stack.push_back(Parens); 3552 } else if (isa<PointerType>(Ty)) { 3553 T = cast<PointerType>(Ty)->getPointeeType(); 3554 Stack.push_back(Pointer); 3555 } else if (isa<BlockPointerType>(Ty)) { 3556 T = cast<BlockPointerType>(Ty)->getPointeeType(); 3557 Stack.push_back(BlockPointer); 3558 } else if (isa<MemberPointerType>(Ty)) { 3559 T = cast<MemberPointerType>(Ty)->getPointeeType(); 3560 Stack.push_back(MemberPointer); 3561 } else if (isa<ReferenceType>(Ty)) { 3562 T = cast<ReferenceType>(Ty)->getPointeeType(); 3563 Stack.push_back(Reference); 3564 } else { 3565 const Type *DTy = Ty->getUnqualifiedDesugaredType(); 3566 if (Ty == DTy) { 3567 Fn = 0; 3568 return; 3569 } 3570 3571 T = QualType(DTy, 0); 3572 Stack.push_back(Desugar); 3573 } 3574 } 3575 } 3576 3577 bool isFunctionType() const { return (Fn != 0); } 3578 const FunctionType *get() const { return Fn; } 3579 3580 QualType wrap(Sema &S, const FunctionType *New) { 3581 // If T wasn't modified from the unwrapped type, do nothing. 3582 if (New == get()) return Original; 3583 3584 Fn = New; 3585 return wrap(S.Context, Original, 0); 3586 } 3587 3588 private: 3589 QualType wrap(ASTContext &C, QualType Old, unsigned I) { 3590 if (I == Stack.size()) 3591 return C.getQualifiedType(Fn, Old.getQualifiers()); 3592 3593 // Build up the inner type, applying the qualifiers from the old 3594 // type to the new type. 3595 SplitQualType SplitOld = Old.split(); 3596 3597 // As a special case, tail-recurse if there are no qualifiers. 3598 if (SplitOld.Quals.empty()) 3599 return wrap(C, SplitOld.Ty, I); 3600 return C.getQualifiedType(wrap(C, SplitOld.Ty, I), SplitOld.Quals); 3601 } 3602 3603 QualType wrap(ASTContext &C, const Type *Old, unsigned I) { 3604 if (I == Stack.size()) return QualType(Fn, 0); 3605 3606 switch (static_cast<WrapKind>(Stack[I++])) { 3607 case Desugar: 3608 // This is the point at which we potentially lose source 3609 // information. 3610 return wrap(C, Old->getUnqualifiedDesugaredType(), I); 3611 3612 case Parens: { 3613 QualType New = wrap(C, cast<ParenType>(Old)->getInnerType(), I); 3614 return C.getParenType(New); 3615 } 3616 3617 case Pointer: { 3618 QualType New = wrap(C, cast<PointerType>(Old)->getPointeeType(), I); 3619 return C.getPointerType(New); 3620 } 3621 3622 case BlockPointer: { 3623 QualType New = wrap(C, cast<BlockPointerType>(Old)->getPointeeType(),I); 3624 return C.getBlockPointerType(New); 3625 } 3626 3627 case MemberPointer: { 3628 const MemberPointerType *OldMPT = cast<MemberPointerType>(Old); 3629 QualType New = wrap(C, OldMPT->getPointeeType(), I); 3630 return C.getMemberPointerType(New, OldMPT->getClass()); 3631 } 3632 3633 case Reference: { 3634 const ReferenceType *OldRef = cast<ReferenceType>(Old); 3635 QualType New = wrap(C, OldRef->getPointeeType(), I); 3636 if (isa<LValueReferenceType>(OldRef)) 3637 return C.getLValueReferenceType(New, OldRef->isSpelledAsLValue()); 3638 else 3639 return C.getRValueReferenceType(New); 3640 } 3641 } 3642 3643 llvm_unreachable("unknown wrapping kind"); 3644 } 3645 }; 3646 } 3647 3648 /// Process an individual function attribute. Returns true to 3649 /// indicate that the attribute was handled, false if it wasn't. 3650 static bool handleFunctionTypeAttr(TypeProcessingState &state, 3651 AttributeList &attr, 3652 QualType &type) { 3653 Sema &S = state.getSema(); 3654 3655 FunctionTypeUnwrapper unwrapped(S, type); 3656 3657 if (attr.getKind() == AttributeList::AT_noreturn) { 3658 if (S.CheckNoReturnAttr(attr)) 3659 return true; 3660 3661 // Delay if this is not a function type. 3662 if (!unwrapped.isFunctionType()) 3663 return false; 3664 3665 // Otherwise we can process right away. 3666 FunctionType::ExtInfo EI = unwrapped.get()->getExtInfo().withNoReturn(true); 3667 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 3668 return true; 3669 } 3670 3671 // ns_returns_retained is not always a type attribute, but if we got 3672 // here, we're treating it as one right now. 3673 if (attr.getKind() == AttributeList::AT_ns_returns_retained) { 3674 assert(S.getLangOpts().ObjCAutoRefCount && 3675 "ns_returns_retained treated as type attribute in non-ARC"); 3676 if (attr.getNumArgs()) return true; 3677 3678 // Delay if this is not a function type. 3679 if (!unwrapped.isFunctionType()) 3680 return false; 3681 3682 FunctionType::ExtInfo EI 3683 = unwrapped.get()->getExtInfo().withProducesResult(true); 3684 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 3685 return true; 3686 } 3687 3688 if (attr.getKind() == AttributeList::AT_regparm) { 3689 unsigned value; 3690 if (S.CheckRegparmAttr(attr, value)) 3691 return true; 3692 3693 // Delay if this is not a function type. 3694 if (!unwrapped.isFunctionType()) 3695 return false; 3696 3697 // Diagnose regparm with fastcall. 3698 const FunctionType *fn = unwrapped.get(); 3699 CallingConv CC = fn->getCallConv(); 3700 if (CC == CC_X86FastCall) { 3701 S.Diag(attr.getLoc(), diag::err_attributes_are_not_compatible) 3702 << FunctionType::getNameForCallConv(CC) 3703 << "regparm"; 3704 attr.setInvalid(); 3705 return true; 3706 } 3707 3708 FunctionType::ExtInfo EI = 3709 unwrapped.get()->getExtInfo().withRegParm(value); 3710 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 3711 return true; 3712 } 3713 3714 // Otherwise, a calling convention. 3715 CallingConv CC; 3716 if (S.CheckCallingConvAttr(attr, CC)) 3717 return true; 3718 3719 // Delay if the type didn't work out to a function. 3720 if (!unwrapped.isFunctionType()) return false; 3721 3722 const FunctionType *fn = unwrapped.get(); 3723 CallingConv CCOld = fn->getCallConv(); 3724 if (S.Context.getCanonicalCallConv(CC) == 3725 S.Context.getCanonicalCallConv(CCOld)) { 3726 FunctionType::ExtInfo EI= unwrapped.get()->getExtInfo().withCallingConv(CC); 3727 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 3728 return true; 3729 } 3730 3731 if (CCOld != (S.LangOpts.MRTD ? CC_X86StdCall : CC_Default)) { 3732 // Should we diagnose reapplications of the same convention? 3733 S.Diag(attr.getLoc(), diag::err_attributes_are_not_compatible) 3734 << FunctionType::getNameForCallConv(CC) 3735 << FunctionType::getNameForCallConv(CCOld); 3736 attr.setInvalid(); 3737 return true; 3738 } 3739 3740 // Diagnose the use of X86 fastcall on varargs or unprototyped functions. 3741 if (CC == CC_X86FastCall) { 3742 if (isa<FunctionNoProtoType>(fn)) { 3743 S.Diag(attr.getLoc(), diag::err_cconv_knr) 3744 << FunctionType::getNameForCallConv(CC); 3745 attr.setInvalid(); 3746 return true; 3747 } 3748 3749 const FunctionProtoType *FnP = cast<FunctionProtoType>(fn); 3750 if (FnP->isVariadic()) { 3751 S.Diag(attr.getLoc(), diag::err_cconv_varargs) 3752 << FunctionType::getNameForCallConv(CC); 3753 attr.setInvalid(); 3754 return true; 3755 } 3756 3757 // Also diagnose fastcall with regparm. 3758 if (fn->getHasRegParm()) { 3759 S.Diag(attr.getLoc(), diag::err_attributes_are_not_compatible) 3760 << "regparm" 3761 << FunctionType::getNameForCallConv(CC); 3762 attr.setInvalid(); 3763 return true; 3764 } 3765 } 3766 3767 FunctionType::ExtInfo EI = unwrapped.get()->getExtInfo().withCallingConv(CC); 3768 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 3769 return true; 3770 } 3771 3772 /// Handle OpenCL image access qualifiers: read_only, write_only, read_write 3773 static void HandleOpenCLImageAccessAttribute(QualType& CurType, 3774 const AttributeList &Attr, 3775 Sema &S) { 3776 // Check the attribute arguments. 3777 if (Attr.getNumArgs() != 1) { 3778 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 3779 Attr.setInvalid(); 3780 return; 3781 } 3782 Expr *sizeExpr = static_cast<Expr *>(Attr.getArg(0)); 3783 llvm::APSInt arg(32); 3784 if (sizeExpr->isTypeDependent() || sizeExpr->isValueDependent() || 3785 !sizeExpr->isIntegerConstantExpr(arg, S.Context)) { 3786 S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int) 3787 << "opencl_image_access" << sizeExpr->getSourceRange(); 3788 Attr.setInvalid(); 3789 return; 3790 } 3791 unsigned iarg = static_cast<unsigned>(arg.getZExtValue()); 3792 switch (iarg) { 3793 case CLIA_read_only: 3794 case CLIA_write_only: 3795 case CLIA_read_write: 3796 // Implemented in a separate patch 3797 break; 3798 default: 3799 // Implemented in a separate patch 3800 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_size) 3801 << sizeExpr->getSourceRange(); 3802 Attr.setInvalid(); 3803 break; 3804 } 3805 } 3806 3807 /// HandleVectorSizeAttribute - this attribute is only applicable to integral 3808 /// and float scalars, although arrays, pointers, and function return values are 3809 /// allowed in conjunction with this construct. Aggregates with this attribute 3810 /// are invalid, even if they are of the same size as a corresponding scalar. 3811 /// The raw attribute should contain precisely 1 argument, the vector size for 3812 /// the variable, measured in bytes. If curType and rawAttr are well formed, 3813 /// this routine will return a new vector type. 3814 static void HandleVectorSizeAttr(QualType& CurType, const AttributeList &Attr, 3815 Sema &S) { 3816 // Check the attribute arguments. 3817 if (Attr.getNumArgs() != 1) { 3818 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 3819 Attr.setInvalid(); 3820 return; 3821 } 3822 Expr *sizeExpr = static_cast<Expr *>(Attr.getArg(0)); 3823 llvm::APSInt vecSize(32); 3824 if (sizeExpr->isTypeDependent() || sizeExpr->isValueDependent() || 3825 !sizeExpr->isIntegerConstantExpr(vecSize, S.Context)) { 3826 S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int) 3827 << "vector_size" << sizeExpr->getSourceRange(); 3828 Attr.setInvalid(); 3829 return; 3830 } 3831 // the base type must be integer or float, and can't already be a vector. 3832 if (!CurType->isIntegerType() && !CurType->isRealFloatingType()) { 3833 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_vector_type) << CurType; 3834 Attr.setInvalid(); 3835 return; 3836 } 3837 unsigned typeSize = static_cast<unsigned>(S.Context.getTypeSize(CurType)); 3838 // vecSize is specified in bytes - convert to bits. 3839 unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue() * 8); 3840 3841 // the vector size needs to be an integral multiple of the type size. 3842 if (vectorSize % typeSize) { 3843 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_size) 3844 << sizeExpr->getSourceRange(); 3845 Attr.setInvalid(); 3846 return; 3847 } 3848 if (vectorSize == 0) { 3849 S.Diag(Attr.getLoc(), diag::err_attribute_zero_size) 3850 << sizeExpr->getSourceRange(); 3851 Attr.setInvalid(); 3852 return; 3853 } 3854 3855 // Success! Instantiate the vector type, the number of elements is > 0, and 3856 // not required to be a power of 2, unlike GCC. 3857 CurType = S.Context.getVectorType(CurType, vectorSize/typeSize, 3858 VectorType::GenericVector); 3859 } 3860 3861 /// \brief Process the OpenCL-like ext_vector_type attribute when it occurs on 3862 /// a type. 3863 static void HandleExtVectorTypeAttr(QualType &CurType, 3864 const AttributeList &Attr, 3865 Sema &S) { 3866 Expr *sizeExpr; 3867 3868 // Special case where the argument is a template id. 3869 if (Attr.getParameterName()) { 3870 CXXScopeSpec SS; 3871 SourceLocation TemplateKWLoc; 3872 UnqualifiedId id; 3873 id.setIdentifier(Attr.getParameterName(), Attr.getLoc()); 3874 3875 ExprResult Size = S.ActOnIdExpression(S.getCurScope(), SS, TemplateKWLoc, 3876 id, false, false); 3877 if (Size.isInvalid()) 3878 return; 3879 3880 sizeExpr = Size.get(); 3881 } else { 3882 // check the attribute arguments. 3883 if (Attr.getNumArgs() != 1) { 3884 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 3885 return; 3886 } 3887 sizeExpr = Attr.getArg(0); 3888 } 3889 3890 // Create the vector type. 3891 QualType T = S.BuildExtVectorType(CurType, sizeExpr, Attr.getLoc()); 3892 if (!T.isNull()) 3893 CurType = T; 3894 } 3895 3896 /// HandleNeonVectorTypeAttr - The "neon_vector_type" and 3897 /// "neon_polyvector_type" attributes are used to create vector types that 3898 /// are mangled according to ARM's ABI. Otherwise, these types are identical 3899 /// to those created with the "vector_size" attribute. Unlike "vector_size" 3900 /// the argument to these Neon attributes is the number of vector elements, 3901 /// not the vector size in bytes. The vector width and element type must 3902 /// match one of the standard Neon vector types. 3903 static void HandleNeonVectorTypeAttr(QualType& CurType, 3904 const AttributeList &Attr, Sema &S, 3905 VectorType::VectorKind VecKind, 3906 const char *AttrName) { 3907 // Check the attribute arguments. 3908 if (Attr.getNumArgs() != 1) { 3909 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 3910 Attr.setInvalid(); 3911 return; 3912 } 3913 // The number of elements must be an ICE. 3914 Expr *numEltsExpr = static_cast<Expr *>(Attr.getArg(0)); 3915 llvm::APSInt numEltsInt(32); 3916 if (numEltsExpr->isTypeDependent() || numEltsExpr->isValueDependent() || 3917 !numEltsExpr->isIntegerConstantExpr(numEltsInt, S.Context)) { 3918 S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int) 3919 << AttrName << numEltsExpr->getSourceRange(); 3920 Attr.setInvalid(); 3921 return; 3922 } 3923 // Only certain element types are supported for Neon vectors. 3924 const BuiltinType* BTy = CurType->getAs<BuiltinType>(); 3925 if (!BTy || 3926 (VecKind == VectorType::NeonPolyVector && 3927 BTy->getKind() != BuiltinType::SChar && 3928 BTy->getKind() != BuiltinType::Short) || 3929 (BTy->getKind() != BuiltinType::SChar && 3930 BTy->getKind() != BuiltinType::UChar && 3931 BTy->getKind() != BuiltinType::Short && 3932 BTy->getKind() != BuiltinType::UShort && 3933 BTy->getKind() != BuiltinType::Int && 3934 BTy->getKind() != BuiltinType::UInt && 3935 BTy->getKind() != BuiltinType::LongLong && 3936 BTy->getKind() != BuiltinType::ULongLong && 3937 BTy->getKind() != BuiltinType::Float)) { 3938 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_vector_type) <<CurType; 3939 Attr.setInvalid(); 3940 return; 3941 } 3942 // The total size of the vector must be 64 or 128 bits. 3943 unsigned typeSize = static_cast<unsigned>(S.Context.getTypeSize(CurType)); 3944 unsigned numElts = static_cast<unsigned>(numEltsInt.getZExtValue()); 3945 unsigned vecSize = typeSize * numElts; 3946 if (vecSize != 64 && vecSize != 128) { 3947 S.Diag(Attr.getLoc(), diag::err_attribute_bad_neon_vector_size) << CurType; 3948 Attr.setInvalid(); 3949 return; 3950 } 3951 3952 CurType = S.Context.getVectorType(CurType, numElts, VecKind); 3953 } 3954 3955 static void processTypeAttrs(TypeProcessingState &state, QualType &type, 3956 bool isDeclSpec, AttributeList *attrs) { 3957 // Scan through and apply attributes to this type where it makes sense. Some 3958 // attributes (such as __address_space__, __vector_size__, etc) apply to the 3959 // type, but others can be present in the type specifiers even though they 3960 // apply to the decl. Here we apply type attributes and ignore the rest. 3961 3962 AttributeList *next; 3963 do { 3964 AttributeList &attr = *attrs; 3965 next = attr.getNext(); 3966 3967 // Skip attributes that were marked to be invalid. 3968 if (attr.isInvalid()) 3969 continue; 3970 3971 // If this is an attribute we can handle, do so now, 3972 // otherwise, add it to the FnAttrs list for rechaining. 3973 switch (attr.getKind()) { 3974 default: break; 3975 3976 case AttributeList::AT_may_alias: 3977 // FIXME: This attribute needs to actually be handled, but if we ignore 3978 // it it breaks large amounts of Linux software. 3979 attr.setUsedAsTypeAttr(); 3980 break; 3981 case AttributeList::AT_address_space: 3982 HandleAddressSpaceTypeAttribute(type, attr, state.getSema()); 3983 attr.setUsedAsTypeAttr(); 3984 break; 3985 OBJC_POINTER_TYPE_ATTRS_CASELIST: 3986 if (!handleObjCPointerTypeAttr(state, attr, type)) 3987 distributeObjCPointerTypeAttr(state, attr, type); 3988 attr.setUsedAsTypeAttr(); 3989 break; 3990 case AttributeList::AT_vector_size: 3991 HandleVectorSizeAttr(type, attr, state.getSema()); 3992 attr.setUsedAsTypeAttr(); 3993 break; 3994 case AttributeList::AT_ext_vector_type: 3995 if (state.getDeclarator().getDeclSpec().getStorageClassSpec() 3996 != DeclSpec::SCS_typedef) 3997 HandleExtVectorTypeAttr(type, attr, state.getSema()); 3998 attr.setUsedAsTypeAttr(); 3999 break; 4000 case AttributeList::AT_neon_vector_type: 4001 HandleNeonVectorTypeAttr(type, attr, state.getSema(), 4002 VectorType::NeonVector, "neon_vector_type"); 4003 attr.setUsedAsTypeAttr(); 4004 break; 4005 case AttributeList::AT_neon_polyvector_type: 4006 HandleNeonVectorTypeAttr(type, attr, state.getSema(), 4007 VectorType::NeonPolyVector, 4008 "neon_polyvector_type"); 4009 attr.setUsedAsTypeAttr(); 4010 break; 4011 case AttributeList::AT_opencl_image_access: 4012 HandleOpenCLImageAccessAttribute(type, attr, state.getSema()); 4013 attr.setUsedAsTypeAttr(); 4014 break; 4015 4016 case AttributeList::AT_ns_returns_retained: 4017 if (!state.getSema().getLangOpts().ObjCAutoRefCount) 4018 break; 4019 // fallthrough into the function attrs 4020 4021 FUNCTION_TYPE_ATTRS_CASELIST: 4022 attr.setUsedAsTypeAttr(); 4023 4024 // Never process function type attributes as part of the 4025 // declaration-specifiers. 4026 if (isDeclSpec) 4027 distributeFunctionTypeAttrFromDeclSpec(state, attr, type); 4028 4029 // Otherwise, handle the possible delays. 4030 else if (!handleFunctionTypeAttr(state, attr, type)) 4031 distributeFunctionTypeAttr(state, attr, type); 4032 break; 4033 } 4034 } while ((attrs = next)); 4035 } 4036 4037 /// \brief Ensure that the type of the given expression is complete. 4038 /// 4039 /// This routine checks whether the expression \p E has a complete type. If the 4040 /// expression refers to an instantiable construct, that instantiation is 4041 /// performed as needed to complete its type. Furthermore 4042 /// Sema::RequireCompleteType is called for the expression's type (or in the 4043 /// case of a reference type, the referred-to type). 4044 /// 4045 /// \param E The expression whose type is required to be complete. 4046 /// \param PD The partial diagnostic that will be printed out if the type cannot 4047 /// be completed. 4048 /// 4049 /// \returns \c true if the type of \p E is incomplete and diagnosed, \c false 4050 /// otherwise. 4051 bool Sema::RequireCompleteExprType(Expr *E, const PartialDiagnostic &PD, 4052 std::pair<SourceLocation, 4053 PartialDiagnostic> Note) { 4054 QualType T = E->getType(); 4055 4056 // Fast path the case where the type is already complete. 4057 if (!T->isIncompleteType()) 4058 return false; 4059 4060 // Incomplete array types may be completed by the initializer attached to 4061 // their definitions. For static data members of class templates we need to 4062 // instantiate the definition to get this initializer and complete the type. 4063 if (T->isIncompleteArrayType()) { 4064 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E->IgnoreParens())) { 4065 if (VarDecl *Var = dyn_cast<VarDecl>(DRE->getDecl())) { 4066 if (Var->isStaticDataMember() && 4067 Var->getInstantiatedFromStaticDataMember()) { 4068 4069 MemberSpecializationInfo *MSInfo = Var->getMemberSpecializationInfo(); 4070 assert(MSInfo && "Missing member specialization information?"); 4071 if (MSInfo->getTemplateSpecializationKind() 4072 != TSK_ExplicitSpecialization) { 4073 // If we don't already have a point of instantiation, this is it. 4074 if (MSInfo->getPointOfInstantiation().isInvalid()) { 4075 MSInfo->setPointOfInstantiation(E->getLocStart()); 4076 4077 // This is a modification of an existing AST node. Notify 4078 // listeners. 4079 if (ASTMutationListener *L = getASTMutationListener()) 4080 L->StaticDataMemberInstantiated(Var); 4081 } 4082 4083 InstantiateStaticDataMemberDefinition(E->getExprLoc(), Var); 4084 4085 // Update the type to the newly instantiated definition's type both 4086 // here and within the expression. 4087 if (VarDecl *Def = Var->getDefinition()) { 4088 DRE->setDecl(Def); 4089 T = Def->getType(); 4090 DRE->setType(T); 4091 E->setType(T); 4092 } 4093 } 4094 4095 // We still go on to try to complete the type independently, as it 4096 // may also require instantiations or diagnostics if it remains 4097 // incomplete. 4098 } 4099 } 4100 } 4101 } 4102 4103 // FIXME: Are there other cases which require instantiating something other 4104 // than the type to complete the type of an expression? 4105 4106 // Look through reference types and complete the referred type. 4107 if (const ReferenceType *Ref = T->getAs<ReferenceType>()) 4108 T = Ref->getPointeeType(); 4109 4110 return RequireCompleteType(E->getExprLoc(), T, PD, Note); 4111 } 4112 4113 /// @brief Ensure that the type T is a complete type. 4114 /// 4115 /// This routine checks whether the type @p T is complete in any 4116 /// context where a complete type is required. If @p T is a complete 4117 /// type, returns false. If @p T is a class template specialization, 4118 /// this routine then attempts to perform class template 4119 /// instantiation. If instantiation fails, or if @p T is incomplete 4120 /// and cannot be completed, issues the diagnostic @p diag (giving it 4121 /// the type @p T) and returns true. 4122 /// 4123 /// @param Loc The location in the source that the incomplete type 4124 /// diagnostic should refer to. 4125 /// 4126 /// @param T The type that this routine is examining for completeness. 4127 /// 4128 /// @param PD The partial diagnostic that will be printed out if T is not a 4129 /// complete type. 4130 /// 4131 /// @returns @c true if @p T is incomplete and a diagnostic was emitted, 4132 /// @c false otherwise. 4133 bool Sema::RequireCompleteType(SourceLocation Loc, QualType T, 4134 const PartialDiagnostic &PD, 4135 std::pair<SourceLocation, 4136 PartialDiagnostic> Note) { 4137 unsigned diag = PD.getDiagID(); 4138 4139 // FIXME: Add this assertion to make sure we always get instantiation points. 4140 // assert(!Loc.isInvalid() && "Invalid location in RequireCompleteType"); 4141 // FIXME: Add this assertion to help us flush out problems with 4142 // checking for dependent types and type-dependent expressions. 4143 // 4144 // assert(!T->isDependentType() && 4145 // "Can't ask whether a dependent type is complete"); 4146 4147 // If we have a complete type, we're done. 4148 NamedDecl *Def = 0; 4149 if (!T->isIncompleteType(&Def)) { 4150 // If we know about the definition but it is not visible, complain. 4151 if (diag != 0 && Def && !LookupResult::isVisible(Def)) { 4152 // Suppress this error outside of a SFINAE context if we've already 4153 // emitted the error once for this type. There's no usefulness in 4154 // repeating the diagnostic. 4155 // FIXME: Add a Fix-It that imports the corresponding module or includes 4156 // the header. 4157 if (isSFINAEContext() || HiddenDefinitions.insert(Def)) { 4158 Diag(Loc, diag::err_module_private_definition) << T; 4159 Diag(Def->getLocation(), diag::note_previous_definition); 4160 } 4161 } 4162 4163 return false; 4164 } 4165 4166 const TagType *Tag = T->getAs<TagType>(); 4167 const ObjCInterfaceType *IFace = 0; 4168 4169 if (Tag) { 4170 // Avoid diagnosing invalid decls as incomplete. 4171 if (Tag->getDecl()->isInvalidDecl()) 4172 return true; 4173 4174 // Give the external AST source a chance to complete the type. 4175 if (Tag->getDecl()->hasExternalLexicalStorage()) { 4176 Context.getExternalSource()->CompleteType(Tag->getDecl()); 4177 if (!Tag->isIncompleteType()) 4178 return false; 4179 } 4180 } 4181 else if ((IFace = T->getAs<ObjCInterfaceType>())) { 4182 // Avoid diagnosing invalid decls as incomplete. 4183 if (IFace->getDecl()->isInvalidDecl()) 4184 return true; 4185 4186 // Give the external AST source a chance to complete the type. 4187 if (IFace->getDecl()->hasExternalLexicalStorage()) { 4188 Context.getExternalSource()->CompleteType(IFace->getDecl()); 4189 if (!IFace->isIncompleteType()) 4190 return false; 4191 } 4192 } 4193 4194 // If we have a class template specialization or a class member of a 4195 // class template specialization, or an array with known size of such, 4196 // try to instantiate it. 4197 QualType MaybeTemplate = T; 4198 if (const ConstantArrayType *Array = Context.getAsConstantArrayType(T)) 4199 MaybeTemplate = Array->getElementType(); 4200 if (const RecordType *Record = MaybeTemplate->getAs<RecordType>()) { 4201 if (ClassTemplateSpecializationDecl *ClassTemplateSpec 4202 = dyn_cast<ClassTemplateSpecializationDecl>(Record->getDecl())) { 4203 if (ClassTemplateSpec->getSpecializationKind() == TSK_Undeclared) 4204 return InstantiateClassTemplateSpecialization(Loc, ClassTemplateSpec, 4205 TSK_ImplicitInstantiation, 4206 /*Complain=*/diag != 0); 4207 } else if (CXXRecordDecl *Rec 4208 = dyn_cast<CXXRecordDecl>(Record->getDecl())) { 4209 CXXRecordDecl *Pattern = Rec->getInstantiatedFromMemberClass(); 4210 if (!Rec->isBeingDefined() && Pattern) { 4211 MemberSpecializationInfo *MSI = Rec->getMemberSpecializationInfo(); 4212 assert(MSI && "Missing member specialization information?"); 4213 // This record was instantiated from a class within a template. 4214 if (MSI->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 4215 return InstantiateClass(Loc, Rec, Pattern, 4216 getTemplateInstantiationArgs(Rec), 4217 TSK_ImplicitInstantiation, 4218 /*Complain=*/diag != 0); 4219 } 4220 } 4221 } 4222 4223 if (diag == 0) 4224 return true; 4225 4226 // We have an incomplete type. Produce a diagnostic. 4227 Diag(Loc, PD) << T; 4228 4229 // If we have a note, produce it. 4230 if (!Note.first.isInvalid()) 4231 Diag(Note.first, Note.second); 4232 4233 // If the type was a forward declaration of a class/struct/union 4234 // type, produce a note. 4235 if (Tag && !Tag->getDecl()->isInvalidDecl()) 4236 Diag(Tag->getDecl()->getLocation(), 4237 Tag->isBeingDefined() ? diag::note_type_being_defined 4238 : diag::note_forward_declaration) 4239 << QualType(Tag, 0); 4240 4241 // If the Objective-C class was a forward declaration, produce a note. 4242 if (IFace && !IFace->getDecl()->isInvalidDecl()) 4243 Diag(IFace->getDecl()->getLocation(), diag::note_forward_class); 4244 4245 return true; 4246 } 4247 4248 bool Sema::RequireCompleteType(SourceLocation Loc, QualType T, 4249 const PartialDiagnostic &PD) { 4250 return RequireCompleteType(Loc, T, PD, 4251 std::make_pair(SourceLocation(), PDiag(0))); 4252 } 4253 4254 bool Sema::RequireCompleteType(SourceLocation Loc, QualType T, 4255 unsigned DiagID) { 4256 return RequireCompleteType(Loc, T, PDiag(DiagID), 4257 std::make_pair(SourceLocation(), PDiag(0))); 4258 } 4259 4260 /// @brief Ensure that the type T is a literal type. 4261 /// 4262 /// This routine checks whether the type @p T is a literal type. If @p T is an 4263 /// incomplete type, an attempt is made to complete it. If @p T is a literal 4264 /// type, or @p AllowIncompleteType is true and @p T is an incomplete type, 4265 /// returns false. Otherwise, this routine issues the diagnostic @p PD (giving 4266 /// it the type @p T), along with notes explaining why the type is not a 4267 /// literal type, and returns true. 4268 /// 4269 /// @param Loc The location in the source that the non-literal type 4270 /// diagnostic should refer to. 4271 /// 4272 /// @param T The type that this routine is examining for literalness. 4273 /// 4274 /// @param PD The partial diagnostic that will be printed out if T is not a 4275 /// literal type. 4276 /// 4277 /// @returns @c true if @p T is not a literal type and a diagnostic was emitted, 4278 /// @c false otherwise. 4279 bool Sema::RequireLiteralType(SourceLocation Loc, QualType T, 4280 const PartialDiagnostic &PD) { 4281 assert(!T->isDependentType() && "type should not be dependent"); 4282 4283 QualType ElemType = Context.getBaseElementType(T); 4284 RequireCompleteType(Loc, ElemType, 0); 4285 4286 if (T->isLiteralType()) 4287 return false; 4288 4289 if (PD.getDiagID() == 0) 4290 return true; 4291 4292 Diag(Loc, PD) << T; 4293 4294 if (T->isVariableArrayType()) 4295 return true; 4296 4297 const RecordType *RT = ElemType->getAs<RecordType>(); 4298 if (!RT) 4299 return true; 4300 4301 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 4302 4303 // FIXME: Better diagnostic for incomplete class? 4304 if (!RD->isCompleteDefinition()) 4305 return true; 4306 4307 // If the class has virtual base classes, then it's not an aggregate, and 4308 // cannot have any constexpr constructors or a trivial default constructor, 4309 // so is non-literal. This is better to diagnose than the resulting absence 4310 // of constexpr constructors. 4311 if (RD->getNumVBases()) { 4312 Diag(RD->getLocation(), diag::note_non_literal_virtual_base) 4313 << RD->isStruct() << RD->getNumVBases(); 4314 for (CXXRecordDecl::base_class_const_iterator I = RD->vbases_begin(), 4315 E = RD->vbases_end(); I != E; ++I) 4316 Diag(I->getLocStart(), 4317 diag::note_constexpr_virtual_base_here) << I->getSourceRange(); 4318 } else if (!RD->isAggregate() && !RD->hasConstexprNonCopyMoveConstructor() && 4319 !RD->hasTrivialDefaultConstructor()) { 4320 Diag(RD->getLocation(), diag::note_non_literal_no_constexpr_ctors) << RD; 4321 } else if (RD->hasNonLiteralTypeFieldsOrBases()) { 4322 for (CXXRecordDecl::base_class_const_iterator I = RD->bases_begin(), 4323 E = RD->bases_end(); I != E; ++I) { 4324 if (!I->getType()->isLiteralType()) { 4325 Diag(I->getLocStart(), 4326 diag::note_non_literal_base_class) 4327 << RD << I->getType() << I->getSourceRange(); 4328 return true; 4329 } 4330 } 4331 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 4332 E = RD->field_end(); I != E; ++I) { 4333 if (!(*I)->getType()->isLiteralType() || 4334 (*I)->getType().isVolatileQualified()) { 4335 Diag((*I)->getLocation(), diag::note_non_literal_field) 4336 << RD << (*I) << (*I)->getType() 4337 << (*I)->getType().isVolatileQualified(); 4338 return true; 4339 } 4340 } 4341 } else if (!RD->hasTrivialDestructor()) { 4342 // All fields and bases are of literal types, so have trivial destructors. 4343 // If this class's destructor is non-trivial it must be user-declared. 4344 CXXDestructorDecl *Dtor = RD->getDestructor(); 4345 assert(Dtor && "class has literal fields and bases but no dtor?"); 4346 if (!Dtor) 4347 return true; 4348 4349 Diag(Dtor->getLocation(), Dtor->isUserProvided() ? 4350 diag::note_non_literal_user_provided_dtor : 4351 diag::note_non_literal_nontrivial_dtor) << RD; 4352 } 4353 4354 return true; 4355 } 4356 4357 /// \brief Retrieve a version of the type 'T' that is elaborated by Keyword 4358 /// and qualified by the nested-name-specifier contained in SS. 4359 QualType Sema::getElaboratedType(ElaboratedTypeKeyword Keyword, 4360 const CXXScopeSpec &SS, QualType T) { 4361 if (T.isNull()) 4362 return T; 4363 NestedNameSpecifier *NNS; 4364 if (SS.isValid()) 4365 NNS = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 4366 else { 4367 if (Keyword == ETK_None) 4368 return T; 4369 NNS = 0; 4370 } 4371 return Context.getElaboratedType(Keyword, NNS, T); 4372 } 4373 4374 QualType Sema::BuildTypeofExprType(Expr *E, SourceLocation Loc) { 4375 ExprResult ER = CheckPlaceholderExpr(E); 4376 if (ER.isInvalid()) return QualType(); 4377 E = ER.take(); 4378 4379 if (!E->isTypeDependent()) { 4380 QualType T = E->getType(); 4381 if (const TagType *TT = T->getAs<TagType>()) 4382 DiagnoseUseOfDecl(TT->getDecl(), E->getExprLoc()); 4383 } 4384 return Context.getTypeOfExprType(E); 4385 } 4386 4387 /// getDecltypeForExpr - Given an expr, will return the decltype for 4388 /// that expression, according to the rules in C++11 4389 /// [dcl.type.simple]p4 and C++11 [expr.lambda.prim]p18. 4390 static QualType getDecltypeForExpr(Sema &S, Expr *E) { 4391 if (E->isTypeDependent()) 4392 return S.Context.DependentTy; 4393 4394 // C++11 [dcl.type.simple]p4: 4395 // The type denoted by decltype(e) is defined as follows: 4396 // 4397 // - if e is an unparenthesized id-expression or an unparenthesized class 4398 // member access (5.2.5), decltype(e) is the type of the entity named 4399 // by e. If there is no such entity, or if e names a set of overloaded 4400 // functions, the program is ill-formed; 4401 if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E)) { 4402 if (const ValueDecl *VD = dyn_cast<ValueDecl>(DRE->getDecl())) 4403 return VD->getType(); 4404 } 4405 if (const MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 4406 if (const FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl())) 4407 return FD->getType(); 4408 } 4409 4410 // C++11 [expr.lambda.prim]p18: 4411 // Every occurrence of decltype((x)) where x is a possibly 4412 // parenthesized id-expression that names an entity of automatic 4413 // storage duration is treated as if x were transformed into an 4414 // access to a corresponding data member of the closure type that 4415 // would have been declared if x were an odr-use of the denoted 4416 // entity. 4417 using namespace sema; 4418 if (S.getCurLambda()) { 4419 if (isa<ParenExpr>(E)) { 4420 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E->IgnoreParens())) { 4421 if (VarDecl *Var = dyn_cast<VarDecl>(DRE->getDecl())) { 4422 QualType T = S.getCapturedDeclRefType(Var, DRE->getLocation()); 4423 if (!T.isNull()) 4424 return S.Context.getLValueReferenceType(T); 4425 } 4426 } 4427 } 4428 } 4429 4430 4431 // C++11 [dcl.type.simple]p4: 4432 // [...] 4433 QualType T = E->getType(); 4434 switch (E->getValueKind()) { 4435 // - otherwise, if e is an xvalue, decltype(e) is T&&, where T is the 4436 // type of e; 4437 case VK_XValue: T = S.Context.getRValueReferenceType(T); break; 4438 // - otherwise, if e is an lvalue, decltype(e) is T&, where T is the 4439 // type of e; 4440 case VK_LValue: T = S.Context.getLValueReferenceType(T); break; 4441 // - otherwise, decltype(e) is the type of e. 4442 case VK_RValue: break; 4443 } 4444 4445 return T; 4446 } 4447 4448 QualType Sema::BuildDecltypeType(Expr *E, SourceLocation Loc) { 4449 ExprResult ER = CheckPlaceholderExpr(E); 4450 if (ER.isInvalid()) return QualType(); 4451 E = ER.take(); 4452 4453 return Context.getDecltypeType(E, getDecltypeForExpr(*this, E)); 4454 } 4455 4456 QualType Sema::BuildUnaryTransformType(QualType BaseType, 4457 UnaryTransformType::UTTKind UKind, 4458 SourceLocation Loc) { 4459 switch (UKind) { 4460 case UnaryTransformType::EnumUnderlyingType: 4461 if (!BaseType->isDependentType() && !BaseType->isEnumeralType()) { 4462 Diag(Loc, diag::err_only_enums_have_underlying_types); 4463 return QualType(); 4464 } else { 4465 QualType Underlying = BaseType; 4466 if (!BaseType->isDependentType()) { 4467 EnumDecl *ED = BaseType->getAs<EnumType>()->getDecl(); 4468 assert(ED && "EnumType has no EnumDecl"); 4469 DiagnoseUseOfDecl(ED, Loc); 4470 Underlying = ED->getIntegerType(); 4471 } 4472 assert(!Underlying.isNull()); 4473 return Context.getUnaryTransformType(BaseType, Underlying, 4474 UnaryTransformType::EnumUnderlyingType); 4475 } 4476 } 4477 llvm_unreachable("unknown unary transform type"); 4478 } 4479 4480 QualType Sema::BuildAtomicType(QualType T, SourceLocation Loc) { 4481 if (!T->isDependentType()) { 4482 // FIXME: It isn't entirely clear whether incomplete atomic types 4483 // are allowed or not; for simplicity, ban them for the moment. 4484 if (RequireCompleteType(Loc, T, 4485 PDiag(diag::err_atomic_specifier_bad_type) << 0)) 4486 return QualType(); 4487 4488 int DisallowedKind = -1; 4489 if (T->isArrayType()) 4490 DisallowedKind = 1; 4491 else if (T->isFunctionType()) 4492 DisallowedKind = 2; 4493 else if (T->isReferenceType()) 4494 DisallowedKind = 3; 4495 else if (T->isAtomicType()) 4496 DisallowedKind = 4; 4497 else if (T.hasQualifiers()) 4498 DisallowedKind = 5; 4499 else if (!T.isTriviallyCopyableType(Context)) 4500 // Some other non-trivially-copyable type (probably a C++ class) 4501 DisallowedKind = 6; 4502 4503 if (DisallowedKind != -1) { 4504 Diag(Loc, diag::err_atomic_specifier_bad_type) << DisallowedKind << T; 4505 return QualType(); 4506 } 4507 4508 // FIXME: Do we need any handling for ARC here? 4509 } 4510 4511 // Build the pointer type. 4512 return Context.getAtomicType(T); 4513 } 4514