SemaType.cpp revision bb35151a166db2b4fee043bc90e60858ac2b7a89
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" 35using 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. 39static 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. 56static 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_ObjCGC: 63 diagID = diag::warn_pointer_attribute_wrong_type; 64 useExpansionLoc = true; 65 break; 66 67 case AttributeList::AT_ObjCOwnership: 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_ObjCGC: \ 97 case AttributeList::AT_ObjCOwnership 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 110namespace { 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 236namespace llvm { 237 template <> struct isPodLike<AttrAndList> { 238 static const bool value = true; 239 }; 240} 241 242static void spliceAttrIntoList(AttributeList &attr, AttributeList *&head) { 243 attr.setNext(head); 244 head = &attr; 245} 246 247static 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 264static void moveAttrFromListToList(AttributeList &attr, 265 AttributeList *&fromList, 266 AttributeList *&toList) { 267 spliceAttrOutOfList(attr, fromList); 268 spliceAttrIntoList(attr, toList); 269} 270 271static void processTypeAttrs(TypeProcessingState &state, 272 QualType &type, bool isDeclSpec, 273 AttributeList *attrs); 274 275static bool handleFunctionTypeAttr(TypeProcessingState &state, 276 AttributeList &attr, 277 QualType &type); 278 279static bool handleObjCGCTypeAttr(TypeProcessingState &state, 280 AttributeList &attr, QualType &type); 281 282static bool handleObjCOwnershipTypeAttr(TypeProcessingState &state, 283 AttributeList &attr, QualType &type); 284 285static bool handleObjCPointerTypeAttr(TypeProcessingState &state, 286 AttributeList &attr, QualType &type) { 287 if (attr.getKind() == AttributeList::AT_ObjCGC) 288 return handleObjCGCTypeAttr(state, attr, type); 289 assert(attr.getKind() == AttributeList::AT_ObjCOwnership); 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. 298static 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. 329static void 330distributeObjCPointerTypeAttrFromDeclarator(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. 391static 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. 422static bool 423distributeFunctionTypeAttrToInnermost(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. 448static void 449distributeFunctionTypeAttrFromDeclSpec(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. 467static void 468distributeFunctionTypeAttrFromDeclarator(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; 494static 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_NSReturnsRetained: 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. 525static 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, 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 state Specifies the declarator containing the declaration specifier 577/// to be converted, along with other associated processing state. 578/// \returns The type described by the declaration specifiers. This function 579/// never returns null. 580static QualType ConvertDeclSpecToType(TypeProcessingState &state) { 581 // FIXME: Should move the logic from DeclSpec::Finish to here for validity 582 // checking. 583 584 Sema &S = state.getSema(); 585 Declarator &declarator = state.getDeclarator(); 586 const DeclSpec &DS = declarator.getDeclSpec(); 587 SourceLocation DeclLoc = declarator.getIdentifierLoc(); 588 if (DeclLoc.isInvalid()) 589 DeclLoc = DS.getLocStart(); 590 591 ASTContext &Context = S.Context; 592 593 QualType Result; 594 switch (DS.getTypeSpecType()) { 595 case DeclSpec::TST_void: 596 Result = Context.VoidTy; 597 break; 598 case DeclSpec::TST_char: 599 if (DS.getTypeSpecSign() == DeclSpec::TSS_unspecified) 600 Result = Context.CharTy; 601 else if (DS.getTypeSpecSign() == DeclSpec::TSS_signed) 602 Result = Context.SignedCharTy; 603 else { 604 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unsigned && 605 "Unknown TSS value"); 606 Result = Context.UnsignedCharTy; 607 } 608 break; 609 case DeclSpec::TST_wchar: 610 if (DS.getTypeSpecSign() == DeclSpec::TSS_unspecified) 611 Result = Context.WCharTy; 612 else if (DS.getTypeSpecSign() == DeclSpec::TSS_signed) { 613 S.Diag(DS.getTypeSpecSignLoc(), diag::ext_invalid_sign_spec) 614 << DS.getSpecifierName(DS.getTypeSpecType()); 615 Result = Context.getSignedWCharType(); 616 } else { 617 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unsigned && 618 "Unknown TSS value"); 619 S.Diag(DS.getTypeSpecSignLoc(), diag::ext_invalid_sign_spec) 620 << DS.getSpecifierName(DS.getTypeSpecType()); 621 Result = Context.getUnsignedWCharType(); 622 } 623 break; 624 case DeclSpec::TST_char16: 625 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unspecified && 626 "Unknown TSS value"); 627 Result = Context.Char16Ty; 628 break; 629 case DeclSpec::TST_char32: 630 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unspecified && 631 "Unknown TSS value"); 632 Result = Context.Char32Ty; 633 break; 634 case DeclSpec::TST_unspecified: 635 // "<proto1,proto2>" is an objc qualified ID with a missing id. 636 if (DeclSpec::ProtocolQualifierListTy PQ = DS.getProtocolQualifiers()) { 637 Result = Context.getObjCObjectType(Context.ObjCBuiltinIdTy, 638 (ObjCProtocolDecl**)PQ, 639 DS.getNumProtocolQualifiers()); 640 Result = Context.getObjCObjectPointerType(Result); 641 break; 642 } 643 644 // If this is a missing declspec in a block literal return context, then it 645 // is inferred from the return statements inside the block. 646 // The declspec is always missing in a lambda expr context; it is either 647 // specified with a trailing return type or inferred. 648 if (declarator.getContext() == Declarator::LambdaExprContext || 649 isOmittedBlockReturnType(declarator)) { 650 Result = Context.DependentTy; 651 break; 652 } 653 654 // Unspecified typespec defaults to int in C90. However, the C90 grammar 655 // [C90 6.5] only allows a decl-spec if there was *some* type-specifier, 656 // type-qualifier, or storage-class-specifier. If not, emit an extwarn. 657 // Note that the one exception to this is function definitions, which are 658 // allowed to be completely missing a declspec. This is handled in the 659 // parser already though by it pretending to have seen an 'int' in this 660 // case. 661 if (S.getLangOpts().ImplicitInt) { 662 // In C89 mode, we only warn if there is a completely missing declspec 663 // when one is not allowed. 664 if (DS.isEmpty()) { 665 S.Diag(DeclLoc, diag::ext_missing_declspec) 666 << DS.getSourceRange() 667 << FixItHint::CreateInsertion(DS.getLocStart(), "int"); 668 } 669 } else if (!DS.hasTypeSpecifier()) { 670 // C99 and C++ require a type specifier. For example, C99 6.7.2p2 says: 671 // "At least one type specifier shall be given in the declaration 672 // specifiers in each declaration, and in the specifier-qualifier list in 673 // each struct declaration and type name." 674 // FIXME: Does Microsoft really have the implicit int extension in C++? 675 if (S.getLangOpts().CPlusPlus && 676 !S.getLangOpts().MicrosoftExt) { 677 S.Diag(DeclLoc, diag::err_missing_type_specifier) 678 << DS.getSourceRange(); 679 680 // When this occurs in C++ code, often something is very broken with the 681 // value being declared, poison it as invalid so we don't get chains of 682 // errors. 683 declarator.setInvalidType(true); 684 } else { 685 S.Diag(DeclLoc, diag::ext_missing_type_specifier) 686 << DS.getSourceRange(); 687 } 688 } 689 690 // FALL THROUGH. 691 case DeclSpec::TST_int: { 692 if (DS.getTypeSpecSign() != DeclSpec::TSS_unsigned) { 693 switch (DS.getTypeSpecWidth()) { 694 case DeclSpec::TSW_unspecified: Result = Context.IntTy; break; 695 case DeclSpec::TSW_short: Result = Context.ShortTy; break; 696 case DeclSpec::TSW_long: Result = Context.LongTy; break; 697 case DeclSpec::TSW_longlong: 698 Result = Context.LongLongTy; 699 700 // long long is a C99 feature. 701 if (!S.getLangOpts().C99) 702 S.Diag(DS.getTypeSpecWidthLoc(), 703 S.getLangOpts().CPlusPlus0x ? 704 diag::warn_cxx98_compat_longlong : diag::ext_longlong); 705 break; 706 } 707 } else { 708 switch (DS.getTypeSpecWidth()) { 709 case DeclSpec::TSW_unspecified: Result = Context.UnsignedIntTy; break; 710 case DeclSpec::TSW_short: Result = Context.UnsignedShortTy; break; 711 case DeclSpec::TSW_long: Result = Context.UnsignedLongTy; break; 712 case DeclSpec::TSW_longlong: 713 Result = Context.UnsignedLongLongTy; 714 715 // long long is a C99 feature. 716 if (!S.getLangOpts().C99) 717 S.Diag(DS.getTypeSpecWidthLoc(), 718 S.getLangOpts().CPlusPlus0x ? 719 diag::warn_cxx98_compat_longlong : diag::ext_longlong); 720 break; 721 } 722 } 723 break; 724 } 725 case DeclSpec::TST_int128: 726 if (DS.getTypeSpecSign() == DeclSpec::TSS_unsigned) 727 Result = Context.UnsignedInt128Ty; 728 else 729 Result = Context.Int128Ty; 730 break; 731 case DeclSpec::TST_half: Result = Context.HalfTy; break; 732 case DeclSpec::TST_float: Result = Context.FloatTy; break; 733 case DeclSpec::TST_double: 734 if (DS.getTypeSpecWidth() == DeclSpec::TSW_long) 735 Result = Context.LongDoubleTy; 736 else 737 Result = Context.DoubleTy; 738 739 if (S.getLangOpts().OpenCL && !S.getOpenCLOptions().cl_khr_fp64) { 740 S.Diag(DS.getTypeSpecTypeLoc(), diag::err_double_requires_fp64); 741 declarator.setInvalidType(true); 742 } 743 break; 744 case DeclSpec::TST_bool: Result = Context.BoolTy; break; // _Bool or bool 745 case DeclSpec::TST_decimal32: // _Decimal32 746 case DeclSpec::TST_decimal64: // _Decimal64 747 case DeclSpec::TST_decimal128: // _Decimal128 748 S.Diag(DS.getTypeSpecTypeLoc(), diag::err_decimal_unsupported); 749 Result = Context.IntTy; 750 declarator.setInvalidType(true); 751 break; 752 case DeclSpec::TST_class: 753 case DeclSpec::TST_enum: 754 case DeclSpec::TST_union: 755 case DeclSpec::TST_struct: { 756 TypeDecl *D = dyn_cast_or_null<TypeDecl>(DS.getRepAsDecl()); 757 if (!D) { 758 // This can happen in C++ with ambiguous lookups. 759 Result = Context.IntTy; 760 declarator.setInvalidType(true); 761 break; 762 } 763 764 // If the type is deprecated or unavailable, diagnose it. 765 S.DiagnoseUseOfDecl(D, DS.getTypeSpecTypeNameLoc()); 766 767 assert(DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 && 768 DS.getTypeSpecSign() == 0 && "No qualifiers on tag names!"); 769 770 // TypeQuals handled by caller. 771 Result = Context.getTypeDeclType(D); 772 773 // In both C and C++, make an ElaboratedType. 774 ElaboratedTypeKeyword Keyword 775 = ElaboratedType::getKeywordForTypeSpec(DS.getTypeSpecType()); 776 Result = S.getElaboratedType(Keyword, DS.getTypeSpecScope(), Result); 777 break; 778 } 779 case DeclSpec::TST_typename: { 780 assert(DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 && 781 DS.getTypeSpecSign() == 0 && 782 "Can't handle qualifiers on typedef names yet!"); 783 Result = S.GetTypeFromParser(DS.getRepAsType()); 784 if (Result.isNull()) 785 declarator.setInvalidType(true); 786 else if (DeclSpec::ProtocolQualifierListTy PQ 787 = DS.getProtocolQualifiers()) { 788 if (const ObjCObjectType *ObjT = Result->getAs<ObjCObjectType>()) { 789 // Silently drop any existing protocol qualifiers. 790 // TODO: determine whether that's the right thing to do. 791 if (ObjT->getNumProtocols()) 792 Result = ObjT->getBaseType(); 793 794 if (DS.getNumProtocolQualifiers()) 795 Result = Context.getObjCObjectType(Result, 796 (ObjCProtocolDecl**) PQ, 797 DS.getNumProtocolQualifiers()); 798 } else if (Result->isObjCIdType()) { 799 // id<protocol-list> 800 Result = Context.getObjCObjectType(Context.ObjCBuiltinIdTy, 801 (ObjCProtocolDecl**) PQ, 802 DS.getNumProtocolQualifiers()); 803 Result = Context.getObjCObjectPointerType(Result); 804 } else if (Result->isObjCClassType()) { 805 // Class<protocol-list> 806 Result = Context.getObjCObjectType(Context.ObjCBuiltinClassTy, 807 (ObjCProtocolDecl**) PQ, 808 DS.getNumProtocolQualifiers()); 809 Result = Context.getObjCObjectPointerType(Result); 810 } else { 811 S.Diag(DeclLoc, diag::err_invalid_protocol_qualifiers) 812 << DS.getSourceRange(); 813 declarator.setInvalidType(true); 814 } 815 } 816 817 // TypeQuals handled by caller. 818 break; 819 } 820 case DeclSpec::TST_typeofType: 821 // FIXME: Preserve type source info. 822 Result = S.GetTypeFromParser(DS.getRepAsType()); 823 assert(!Result.isNull() && "Didn't get a type for typeof?"); 824 if (!Result->isDependentType()) 825 if (const TagType *TT = Result->getAs<TagType>()) 826 S.DiagnoseUseOfDecl(TT->getDecl(), DS.getTypeSpecTypeLoc()); 827 // TypeQuals handled by caller. 828 Result = Context.getTypeOfType(Result); 829 break; 830 case DeclSpec::TST_typeofExpr: { 831 Expr *E = DS.getRepAsExpr(); 832 assert(E && "Didn't get an expression for typeof?"); 833 // TypeQuals handled by caller. 834 Result = S.BuildTypeofExprType(E, DS.getTypeSpecTypeLoc()); 835 if (Result.isNull()) { 836 Result = Context.IntTy; 837 declarator.setInvalidType(true); 838 } 839 break; 840 } 841 case DeclSpec::TST_decltype: { 842 Expr *E = DS.getRepAsExpr(); 843 assert(E && "Didn't get an expression for decltype?"); 844 // TypeQuals handled by caller. 845 Result = S.BuildDecltypeType(E, DS.getTypeSpecTypeLoc()); 846 if (Result.isNull()) { 847 Result = Context.IntTy; 848 declarator.setInvalidType(true); 849 } 850 break; 851 } 852 case DeclSpec::TST_underlyingType: 853 Result = S.GetTypeFromParser(DS.getRepAsType()); 854 assert(!Result.isNull() && "Didn't get a type for __underlying_type?"); 855 Result = S.BuildUnaryTransformType(Result, 856 UnaryTransformType::EnumUnderlyingType, 857 DS.getTypeSpecTypeLoc()); 858 if (Result.isNull()) { 859 Result = Context.IntTy; 860 declarator.setInvalidType(true); 861 } 862 break; 863 864 case DeclSpec::TST_auto: { 865 // TypeQuals handled by caller. 866 Result = Context.getAutoType(QualType()); 867 break; 868 } 869 870 case DeclSpec::TST_unknown_anytype: 871 Result = Context.UnknownAnyTy; 872 break; 873 874 case DeclSpec::TST_atomic: 875 Result = S.GetTypeFromParser(DS.getRepAsType()); 876 assert(!Result.isNull() && "Didn't get a type for _Atomic?"); 877 Result = S.BuildAtomicType(Result, DS.getTypeSpecTypeLoc()); 878 if (Result.isNull()) { 879 Result = Context.IntTy; 880 declarator.setInvalidType(true); 881 } 882 break; 883 884 case DeclSpec::TST_error: 885 Result = Context.IntTy; 886 declarator.setInvalidType(true); 887 break; 888 } 889 890 // Handle complex types. 891 if (DS.getTypeSpecComplex() == DeclSpec::TSC_complex) { 892 if (S.getLangOpts().Freestanding) 893 S.Diag(DS.getTypeSpecComplexLoc(), diag::ext_freestanding_complex); 894 Result = Context.getComplexType(Result); 895 } else if (DS.isTypeAltiVecVector()) { 896 unsigned typeSize = static_cast<unsigned>(Context.getTypeSize(Result)); 897 assert(typeSize > 0 && "type size for vector must be greater than 0 bits"); 898 VectorType::VectorKind VecKind = VectorType::AltiVecVector; 899 if (DS.isTypeAltiVecPixel()) 900 VecKind = VectorType::AltiVecPixel; 901 else if (DS.isTypeAltiVecBool()) 902 VecKind = VectorType::AltiVecBool; 903 Result = Context.getVectorType(Result, 128/typeSize, VecKind); 904 } 905 906 // FIXME: Imaginary. 907 if (DS.getTypeSpecComplex() == DeclSpec::TSC_imaginary) 908 S.Diag(DS.getTypeSpecComplexLoc(), diag::err_imaginary_not_supported); 909 910 // Before we process any type attributes, synthesize a block literal 911 // function declarator if necessary. 912 if (declarator.getContext() == Declarator::BlockLiteralContext) 913 maybeSynthesizeBlockSignature(state, Result); 914 915 // Apply any type attributes from the decl spec. This may cause the 916 // list of type attributes to be temporarily saved while the type 917 // attributes are pushed around. 918 if (AttributeList *attrs = DS.getAttributes().getList()) 919 processTypeAttrs(state, Result, true, attrs); 920 921 // Apply const/volatile/restrict qualifiers to T. 922 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 923 924 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 925 // or incomplete types shall not be restrict-qualified." C++ also allows 926 // restrict-qualified references. 927 if (TypeQuals & DeclSpec::TQ_restrict) { 928 if (Result->isAnyPointerType() || Result->isReferenceType()) { 929 QualType EltTy; 930 if (Result->isObjCObjectPointerType()) 931 EltTy = Result; 932 else 933 EltTy = Result->isPointerType() ? 934 Result->getAs<PointerType>()->getPointeeType() : 935 Result->getAs<ReferenceType>()->getPointeeType(); 936 937 // If we have a pointer or reference, the pointee must have an object 938 // incomplete type. 939 if (!EltTy->isIncompleteOrObjectType()) { 940 S.Diag(DS.getRestrictSpecLoc(), 941 diag::err_typecheck_invalid_restrict_invalid_pointee) 942 << EltTy << DS.getSourceRange(); 943 TypeQuals &= ~DeclSpec::TQ_restrict; // Remove the restrict qualifier. 944 } 945 } else { 946 S.Diag(DS.getRestrictSpecLoc(), 947 diag::err_typecheck_invalid_restrict_not_pointer) 948 << Result << DS.getSourceRange(); 949 TypeQuals &= ~DeclSpec::TQ_restrict; // Remove the restrict qualifier. 950 } 951 } 952 953 // Warn about CV qualifiers on functions: C99 6.7.3p8: "If the specification 954 // of a function type includes any type qualifiers, the behavior is 955 // undefined." 956 if (Result->isFunctionType() && TypeQuals) { 957 // Get some location to point at, either the C or V location. 958 SourceLocation Loc; 959 if (TypeQuals & DeclSpec::TQ_const) 960 Loc = DS.getConstSpecLoc(); 961 else if (TypeQuals & DeclSpec::TQ_volatile) 962 Loc = DS.getVolatileSpecLoc(); 963 else { 964 assert((TypeQuals & DeclSpec::TQ_restrict) && 965 "Has CVR quals but not C, V, or R?"); 966 Loc = DS.getRestrictSpecLoc(); 967 } 968 S.Diag(Loc, diag::warn_typecheck_function_qualifiers) 969 << Result << DS.getSourceRange(); 970 } 971 972 // C++ [dcl.ref]p1: 973 // Cv-qualified references are ill-formed except when the 974 // cv-qualifiers are introduced through the use of a typedef 975 // (7.1.3) or of a template type argument (14.3), in which 976 // case the cv-qualifiers are ignored. 977 // FIXME: Shouldn't we be checking SCS_typedef here? 978 if (DS.getTypeSpecType() == DeclSpec::TST_typename && 979 TypeQuals && Result->isReferenceType()) { 980 TypeQuals &= ~DeclSpec::TQ_const; 981 TypeQuals &= ~DeclSpec::TQ_volatile; 982 } 983 984 // C90 6.5.3 constraints: "The same type qualifier shall not appear more 985 // than once in the same specifier-list or qualifier-list, either directly 986 // or via one or more typedefs." 987 if (!S.getLangOpts().C99 && !S.getLangOpts().CPlusPlus 988 && TypeQuals & Result.getCVRQualifiers()) { 989 if (TypeQuals & DeclSpec::TQ_const && Result.isConstQualified()) { 990 S.Diag(DS.getConstSpecLoc(), diag::ext_duplicate_declspec) 991 << "const"; 992 } 993 994 if (TypeQuals & DeclSpec::TQ_volatile && Result.isVolatileQualified()) { 995 S.Diag(DS.getVolatileSpecLoc(), diag::ext_duplicate_declspec) 996 << "volatile"; 997 } 998 999 // C90 doesn't have restrict, so it doesn't force us to produce a warning 1000 // in this case. 1001 } 1002 1003 Qualifiers Quals = Qualifiers::fromCVRMask(TypeQuals); 1004 Result = Context.getQualifiedType(Result, Quals); 1005 } 1006 1007 return Result; 1008} 1009 1010static std::string getPrintableNameForEntity(DeclarationName Entity) { 1011 if (Entity) 1012 return Entity.getAsString(); 1013 1014 return "type name"; 1015} 1016 1017QualType Sema::BuildQualifiedType(QualType T, SourceLocation Loc, 1018 Qualifiers Qs) { 1019 // Enforce C99 6.7.3p2: "Types other than pointer types derived from 1020 // object or incomplete types shall not be restrict-qualified." 1021 if (Qs.hasRestrict()) { 1022 unsigned DiagID = 0; 1023 QualType ProblemTy; 1024 1025 const Type *Ty = T->getCanonicalTypeInternal().getTypePtr(); 1026 if (const ReferenceType *RTy = dyn_cast<ReferenceType>(Ty)) { 1027 if (!RTy->getPointeeType()->isIncompleteOrObjectType()) { 1028 DiagID = diag::err_typecheck_invalid_restrict_invalid_pointee; 1029 ProblemTy = T->getAs<ReferenceType>()->getPointeeType(); 1030 } 1031 } else if (const PointerType *PTy = dyn_cast<PointerType>(Ty)) { 1032 if (!PTy->getPointeeType()->isIncompleteOrObjectType()) { 1033 DiagID = diag::err_typecheck_invalid_restrict_invalid_pointee; 1034 ProblemTy = T->getAs<PointerType>()->getPointeeType(); 1035 } 1036 } else if (const MemberPointerType *PTy = dyn_cast<MemberPointerType>(Ty)) { 1037 if (!PTy->getPointeeType()->isIncompleteOrObjectType()) { 1038 DiagID = diag::err_typecheck_invalid_restrict_invalid_pointee; 1039 ProblemTy = T->getAs<PointerType>()->getPointeeType(); 1040 } 1041 } else if (!Ty->isDependentType()) { 1042 // FIXME: this deserves a proper diagnostic 1043 DiagID = diag::err_typecheck_invalid_restrict_invalid_pointee; 1044 ProblemTy = T; 1045 } 1046 1047 if (DiagID) { 1048 Diag(Loc, DiagID) << ProblemTy; 1049 Qs.removeRestrict(); 1050 } 1051 } 1052 1053 return Context.getQualifiedType(T, Qs); 1054} 1055 1056/// \brief Build a paren type including \p T. 1057QualType Sema::BuildParenType(QualType T) { 1058 return Context.getParenType(T); 1059} 1060 1061/// Given that we're building a pointer or reference to the given 1062static QualType inferARCLifetimeForPointee(Sema &S, QualType type, 1063 SourceLocation loc, 1064 bool isReference) { 1065 // Bail out if retention is unrequired or already specified. 1066 if (!type->isObjCLifetimeType() || 1067 type.getObjCLifetime() != Qualifiers::OCL_None) 1068 return type; 1069 1070 Qualifiers::ObjCLifetime implicitLifetime = Qualifiers::OCL_None; 1071 1072 // If the object type is const-qualified, we can safely use 1073 // __unsafe_unretained. This is safe (because there are no read 1074 // barriers), and it'll be safe to coerce anything but __weak* to 1075 // the resulting type. 1076 if (type.isConstQualified()) { 1077 implicitLifetime = Qualifiers::OCL_ExplicitNone; 1078 1079 // Otherwise, check whether the static type does not require 1080 // retaining. This currently only triggers for Class (possibly 1081 // protocol-qualifed, and arrays thereof). 1082 } else if (type->isObjCARCImplicitlyUnretainedType()) { 1083 implicitLifetime = Qualifiers::OCL_ExplicitNone; 1084 1085 // If we are in an unevaluated context, like sizeof, skip adding a 1086 // qualification. 1087 } else if (S.ExprEvalContexts.back().Context == Sema::Unevaluated) { 1088 return type; 1089 1090 // If that failed, give an error and recover using __strong. __strong 1091 // is the option most likely to prevent spurious second-order diagnostics, 1092 // like when binding a reference to a field. 1093 } else { 1094 // These types can show up in private ivars in system headers, so 1095 // we need this to not be an error in those cases. Instead we 1096 // want to delay. 1097 if (S.DelayedDiagnostics.shouldDelayDiagnostics()) { 1098 S.DelayedDiagnostics.add( 1099 sema::DelayedDiagnostic::makeForbiddenType(loc, 1100 diag::err_arc_indirect_no_ownership, type, isReference)); 1101 } else { 1102 S.Diag(loc, diag::err_arc_indirect_no_ownership) << type << isReference; 1103 } 1104 implicitLifetime = Qualifiers::OCL_Strong; 1105 } 1106 assert(implicitLifetime && "didn't infer any lifetime!"); 1107 1108 Qualifiers qs; 1109 qs.addObjCLifetime(implicitLifetime); 1110 return S.Context.getQualifiedType(type, qs); 1111} 1112 1113/// \brief Build a pointer type. 1114/// 1115/// \param T The type to which we'll be building a pointer. 1116/// 1117/// \param Loc The location of the entity whose type involves this 1118/// pointer type or, if there is no such entity, the location of the 1119/// type that will have pointer type. 1120/// 1121/// \param Entity The name of the entity that involves the pointer 1122/// type, if known. 1123/// 1124/// \returns A suitable pointer type, if there are no 1125/// errors. Otherwise, returns a NULL type. 1126QualType Sema::BuildPointerType(QualType T, 1127 SourceLocation Loc, DeclarationName Entity) { 1128 if (T->isReferenceType()) { 1129 // C++ 8.3.2p4: There shall be no ... pointers to references ... 1130 Diag(Loc, diag::err_illegal_decl_pointer_to_reference) 1131 << getPrintableNameForEntity(Entity) << T; 1132 return QualType(); 1133 } 1134 1135 assert(!T->isObjCObjectType() && "Should build ObjCObjectPointerType"); 1136 1137 // In ARC, it is forbidden to build pointers to unqualified pointers. 1138 if (getLangOpts().ObjCAutoRefCount) 1139 T = inferARCLifetimeForPointee(*this, T, Loc, /*reference*/ false); 1140 1141 // Build the pointer type. 1142 return Context.getPointerType(T); 1143} 1144 1145/// \brief Build a reference type. 1146/// 1147/// \param T The type to which we'll be building a reference. 1148/// 1149/// \param Loc The location of the entity whose type involves this 1150/// reference type or, if there is no such entity, the location of the 1151/// type that will have reference type. 1152/// 1153/// \param Entity The name of the entity that involves the reference 1154/// type, if known. 1155/// 1156/// \returns A suitable reference type, if there are no 1157/// errors. Otherwise, returns a NULL type. 1158QualType Sema::BuildReferenceType(QualType T, bool SpelledAsLValue, 1159 SourceLocation Loc, 1160 DeclarationName Entity) { 1161 assert(Context.getCanonicalType(T) != Context.OverloadTy && 1162 "Unresolved overloaded function type"); 1163 1164 // C++0x [dcl.ref]p6: 1165 // If a typedef (7.1.3), a type template-parameter (14.3.1), or a 1166 // decltype-specifier (7.1.6.2) denotes a type TR that is a reference to a 1167 // type T, an attempt to create the type "lvalue reference to cv TR" creates 1168 // the type "lvalue reference to T", while an attempt to create the type 1169 // "rvalue reference to cv TR" creates the type TR. 1170 bool LValueRef = SpelledAsLValue || T->getAs<LValueReferenceType>(); 1171 1172 // C++ [dcl.ref]p4: There shall be no references to references. 1173 // 1174 // According to C++ DR 106, references to references are only 1175 // diagnosed when they are written directly (e.g., "int & &"), 1176 // but not when they happen via a typedef: 1177 // 1178 // typedef int& intref; 1179 // typedef intref& intref2; 1180 // 1181 // Parser::ParseDeclaratorInternal diagnoses the case where 1182 // references are written directly; here, we handle the 1183 // collapsing of references-to-references as described in C++0x. 1184 // DR 106 and 540 introduce reference-collapsing into C++98/03. 1185 1186 // C++ [dcl.ref]p1: 1187 // A declarator that specifies the type "reference to cv void" 1188 // is ill-formed. 1189 if (T->isVoidType()) { 1190 Diag(Loc, diag::err_reference_to_void); 1191 return QualType(); 1192 } 1193 1194 // In ARC, it is forbidden to build references to unqualified pointers. 1195 if (getLangOpts().ObjCAutoRefCount) 1196 T = inferARCLifetimeForPointee(*this, T, Loc, /*reference*/ true); 1197 1198 // Handle restrict on references. 1199 if (LValueRef) 1200 return Context.getLValueReferenceType(T, SpelledAsLValue); 1201 return Context.getRValueReferenceType(T); 1202} 1203 1204/// Check whether the specified array size makes the array type a VLA. If so, 1205/// return true, if not, return the size of the array in SizeVal. 1206static bool isArraySizeVLA(Sema &S, Expr *ArraySize, llvm::APSInt &SizeVal) { 1207 // If the size is an ICE, it certainly isn't a VLA. If we're in a GNU mode 1208 // (like gnu99, but not c99) accept any evaluatable value as an extension. 1209 class VLADiagnoser : public Sema::VerifyICEDiagnoser { 1210 public: 1211 VLADiagnoser() : Sema::VerifyICEDiagnoser(true) {} 1212 1213 virtual void diagnoseNotICE(Sema &S, SourceLocation Loc, SourceRange SR) { 1214 } 1215 1216 virtual void diagnoseFold(Sema &S, SourceLocation Loc, SourceRange SR) { 1217 S.Diag(Loc, diag::ext_vla_folded_to_constant) << SR; 1218 } 1219 } Diagnoser; 1220 1221 return S.VerifyIntegerConstantExpression(ArraySize, &SizeVal, Diagnoser, 1222 S.LangOpts.GNUMode).isInvalid(); 1223} 1224 1225 1226/// \brief Build an array type. 1227/// 1228/// \param T The type of each element in the array. 1229/// 1230/// \param ASM C99 array size modifier (e.g., '*', 'static'). 1231/// 1232/// \param ArraySize Expression describing the size of the array. 1233/// 1234/// \param Brackets The range from the opening '[' to the closing ']'. 1235/// 1236/// \param Entity The name of the entity that involves the array 1237/// type, if known. 1238/// 1239/// \returns A suitable array type, if there are no errors. Otherwise, 1240/// returns a NULL type. 1241QualType Sema::BuildArrayType(QualType T, ArrayType::ArraySizeModifier ASM, 1242 Expr *ArraySize, unsigned Quals, 1243 SourceRange Brackets, DeclarationName Entity) { 1244 1245 SourceLocation Loc = Brackets.getBegin(); 1246 if (getLangOpts().CPlusPlus) { 1247 // C++ [dcl.array]p1: 1248 // T is called the array element type; this type shall not be a reference 1249 // type, the (possibly cv-qualified) type void, a function type or an 1250 // abstract class type. 1251 // 1252 // C++ [dcl.array]p3: 1253 // When several "array of" specifications are adjacent, [...] only the 1254 // first of the constant expressions that specify the bounds of the arrays 1255 // may be omitted. 1256 // 1257 // Note: function types are handled in the common path with C. 1258 if (T->isReferenceType()) { 1259 Diag(Loc, diag::err_illegal_decl_array_of_references) 1260 << getPrintableNameForEntity(Entity) << T; 1261 return QualType(); 1262 } 1263 1264 if (T->isVoidType() || T->isIncompleteArrayType()) { 1265 Diag(Loc, diag::err_illegal_decl_array_incomplete_type) << T; 1266 return QualType(); 1267 } 1268 1269 if (RequireNonAbstractType(Brackets.getBegin(), T, 1270 diag::err_array_of_abstract_type)) 1271 return QualType(); 1272 1273 } else { 1274 // C99 6.7.5.2p1: If the element type is an incomplete or function type, 1275 // reject it (e.g. void ary[7], struct foo ary[7], void ary[7]()) 1276 if (RequireCompleteType(Loc, T, 1277 diag::err_illegal_decl_array_incomplete_type)) 1278 return QualType(); 1279 } 1280 1281 if (T->isFunctionType()) { 1282 Diag(Loc, diag::err_illegal_decl_array_of_functions) 1283 << getPrintableNameForEntity(Entity) << T; 1284 return QualType(); 1285 } 1286 1287 if (T->getContainedAutoType()) { 1288 Diag(Loc, diag::err_illegal_decl_array_of_auto) 1289 << getPrintableNameForEntity(Entity) << T; 1290 return QualType(); 1291 } 1292 1293 if (const RecordType *EltTy = T->getAs<RecordType>()) { 1294 // If the element type is a struct or union that contains a variadic 1295 // array, accept it as a GNU extension: C99 6.7.2.1p2. 1296 if (EltTy->getDecl()->hasFlexibleArrayMember()) 1297 Diag(Loc, diag::ext_flexible_array_in_array) << T; 1298 } else if (T->isObjCObjectType()) { 1299 Diag(Loc, diag::err_objc_array_of_interfaces) << T; 1300 return QualType(); 1301 } 1302 1303 // Do placeholder conversions on the array size expression. 1304 if (ArraySize && ArraySize->hasPlaceholderType()) { 1305 ExprResult Result = CheckPlaceholderExpr(ArraySize); 1306 if (Result.isInvalid()) return QualType(); 1307 ArraySize = Result.take(); 1308 } 1309 1310 // Do lvalue-to-rvalue conversions on the array size expression. 1311 if (ArraySize && !ArraySize->isRValue()) { 1312 ExprResult Result = DefaultLvalueConversion(ArraySize); 1313 if (Result.isInvalid()) 1314 return QualType(); 1315 1316 ArraySize = Result.take(); 1317 } 1318 1319 // C99 6.7.5.2p1: The size expression shall have integer type. 1320 // C++11 allows contextual conversions to such types. 1321 if (!getLangOpts().CPlusPlus0x && 1322 ArraySize && !ArraySize->isTypeDependent() && 1323 !ArraySize->getType()->isIntegralOrUnscopedEnumerationType()) { 1324 Diag(ArraySize->getLocStart(), diag::err_array_size_non_int) 1325 << ArraySize->getType() << ArraySize->getSourceRange(); 1326 return QualType(); 1327 } 1328 1329 llvm::APSInt ConstVal(Context.getTypeSize(Context.getSizeType())); 1330 if (!ArraySize) { 1331 if (ASM == ArrayType::Star) 1332 T = Context.getVariableArrayType(T, 0, ASM, Quals, Brackets); 1333 else 1334 T = Context.getIncompleteArrayType(T, ASM, Quals); 1335 } else if (ArraySize->isTypeDependent() || ArraySize->isValueDependent()) { 1336 T = Context.getDependentSizedArrayType(T, ArraySize, ASM, Quals, Brackets); 1337 } else if ((!T->isDependentType() && !T->isIncompleteType() && 1338 !T->isConstantSizeType()) || 1339 isArraySizeVLA(*this, ArraySize, ConstVal)) { 1340 // Even in C++11, don't allow contextual conversions in the array bound 1341 // of a VLA. 1342 if (getLangOpts().CPlusPlus0x && 1343 !ArraySize->getType()->isIntegralOrUnscopedEnumerationType()) { 1344 Diag(ArraySize->getLocStart(), diag::err_array_size_non_int) 1345 << ArraySize->getType() << ArraySize->getSourceRange(); 1346 return QualType(); 1347 } 1348 1349 // C99: an array with an element type that has a non-constant-size is a VLA. 1350 // C99: an array with a non-ICE size is a VLA. We accept any expression 1351 // that we can fold to a non-zero positive value as an extension. 1352 T = Context.getVariableArrayType(T, ArraySize, ASM, Quals, Brackets); 1353 } else { 1354 // C99 6.7.5.2p1: If the expression is a constant expression, it shall 1355 // have a value greater than zero. 1356 if (ConstVal.isSigned() && ConstVal.isNegative()) { 1357 if (Entity) 1358 Diag(ArraySize->getLocStart(), diag::err_decl_negative_array_size) 1359 << getPrintableNameForEntity(Entity) << ArraySize->getSourceRange(); 1360 else 1361 Diag(ArraySize->getLocStart(), diag::err_typecheck_negative_array_size) 1362 << ArraySize->getSourceRange(); 1363 return QualType(); 1364 } 1365 if (ConstVal == 0) { 1366 // GCC accepts zero sized static arrays. We allow them when 1367 // we're not in a SFINAE context. 1368 Diag(ArraySize->getLocStart(), 1369 isSFINAEContext()? diag::err_typecheck_zero_array_size 1370 : diag::ext_typecheck_zero_array_size) 1371 << ArraySize->getSourceRange(); 1372 1373 if (ASM == ArrayType::Static) { 1374 Diag(ArraySize->getLocStart(), 1375 diag::warn_typecheck_zero_static_array_size) 1376 << ArraySize->getSourceRange(); 1377 ASM = ArrayType::Normal; 1378 } 1379 } else if (!T->isDependentType() && !T->isVariablyModifiedType() && 1380 !T->isIncompleteType()) { 1381 // Is the array too large? 1382 unsigned ActiveSizeBits 1383 = ConstantArrayType::getNumAddressingBits(Context, T, ConstVal); 1384 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) 1385 Diag(ArraySize->getLocStart(), diag::err_array_too_large) 1386 << ConstVal.toString(10) 1387 << ArraySize->getSourceRange(); 1388 } 1389 1390 T = Context.getConstantArrayType(T, ConstVal, ASM, Quals); 1391 } 1392 // If this is not C99, extwarn about VLA's and C99 array size modifiers. 1393 if (!getLangOpts().C99) { 1394 if (T->isVariableArrayType()) { 1395 // Prohibit the use of non-POD types in VLAs. 1396 QualType BaseT = Context.getBaseElementType(T); 1397 if (!T->isDependentType() && 1398 !BaseT.isPODType(Context) && 1399 !BaseT->isObjCLifetimeType()) { 1400 Diag(Loc, diag::err_vla_non_pod) 1401 << BaseT; 1402 return QualType(); 1403 } 1404 // Prohibit the use of VLAs during template argument deduction. 1405 else if (isSFINAEContext()) { 1406 Diag(Loc, diag::err_vla_in_sfinae); 1407 return QualType(); 1408 } 1409 // Just extwarn about VLAs. 1410 else 1411 Diag(Loc, diag::ext_vla); 1412 } else if (ASM != ArrayType::Normal || Quals != 0) 1413 Diag(Loc, 1414 getLangOpts().CPlusPlus? diag::err_c99_array_usage_cxx 1415 : diag::ext_c99_array_usage) << ASM; 1416 } 1417 1418 return T; 1419} 1420 1421/// \brief Build an ext-vector type. 1422/// 1423/// Run the required checks for the extended vector type. 1424QualType Sema::BuildExtVectorType(QualType T, Expr *ArraySize, 1425 SourceLocation AttrLoc) { 1426 // unlike gcc's vector_size attribute, we do not allow vectors to be defined 1427 // in conjunction with complex types (pointers, arrays, functions, etc.). 1428 if (!T->isDependentType() && 1429 !T->isIntegerType() && !T->isRealFloatingType()) { 1430 Diag(AttrLoc, diag::err_attribute_invalid_vector_type) << T; 1431 return QualType(); 1432 } 1433 1434 if (!ArraySize->isTypeDependent() && !ArraySize->isValueDependent()) { 1435 llvm::APSInt vecSize(32); 1436 if (!ArraySize->isIntegerConstantExpr(vecSize, Context)) { 1437 Diag(AttrLoc, diag::err_attribute_argument_not_int) 1438 << "ext_vector_type" << ArraySize->getSourceRange(); 1439 return QualType(); 1440 } 1441 1442 // unlike gcc's vector_size attribute, the size is specified as the 1443 // number of elements, not the number of bytes. 1444 unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue()); 1445 1446 if (vectorSize == 0) { 1447 Diag(AttrLoc, diag::err_attribute_zero_size) 1448 << ArraySize->getSourceRange(); 1449 return QualType(); 1450 } 1451 1452 return Context.getExtVectorType(T, vectorSize); 1453 } 1454 1455 return Context.getDependentSizedExtVectorType(T, ArraySize, AttrLoc); 1456} 1457 1458/// \brief Build a function type. 1459/// 1460/// This routine checks the function type according to C++ rules and 1461/// under the assumption that the result type and parameter types have 1462/// just been instantiated from a template. It therefore duplicates 1463/// some of the behavior of GetTypeForDeclarator, but in a much 1464/// simpler form that is only suitable for this narrow use case. 1465/// 1466/// \param T The return type of the function. 1467/// 1468/// \param ParamTypes The parameter types of the function. This array 1469/// will be modified to account for adjustments to the types of the 1470/// function parameters. 1471/// 1472/// \param NumParamTypes The number of parameter types in ParamTypes. 1473/// 1474/// \param Variadic Whether this is a variadic function type. 1475/// 1476/// \param HasTrailingReturn Whether this function has a trailing return type. 1477/// 1478/// \param Quals The cvr-qualifiers to be applied to the function type. 1479/// 1480/// \param Loc The location of the entity whose type involves this 1481/// function type or, if there is no such entity, the location of the 1482/// type that will have function type. 1483/// 1484/// \param Entity The name of the entity that involves the function 1485/// type, if known. 1486/// 1487/// \returns A suitable function type, if there are no 1488/// errors. Otherwise, returns a NULL type. 1489QualType Sema::BuildFunctionType(QualType T, 1490 QualType *ParamTypes, 1491 unsigned NumParamTypes, 1492 bool Variadic, bool HasTrailingReturn, 1493 unsigned Quals, 1494 RefQualifierKind RefQualifier, 1495 SourceLocation Loc, DeclarationName Entity, 1496 FunctionType::ExtInfo Info) { 1497 if (T->isArrayType() || T->isFunctionType()) { 1498 Diag(Loc, diag::err_func_returning_array_function) 1499 << T->isFunctionType() << T; 1500 return QualType(); 1501 } 1502 1503 // Functions cannot return half FP. 1504 if (T->isHalfType()) { 1505 Diag(Loc, diag::err_parameters_retval_cannot_have_fp16_type) << 1 << 1506 FixItHint::CreateInsertion(Loc, "*"); 1507 return QualType(); 1508 } 1509 1510 bool Invalid = false; 1511 for (unsigned Idx = 0; Idx < NumParamTypes; ++Idx) { 1512 // FIXME: Loc is too inprecise here, should use proper locations for args. 1513 QualType ParamType = Context.getAdjustedParameterType(ParamTypes[Idx]); 1514 if (ParamType->isVoidType()) { 1515 Diag(Loc, diag::err_param_with_void_type); 1516 Invalid = true; 1517 } else if (ParamType->isHalfType()) { 1518 // Disallow half FP arguments. 1519 Diag(Loc, diag::err_parameters_retval_cannot_have_fp16_type) << 0 << 1520 FixItHint::CreateInsertion(Loc, "*"); 1521 Invalid = true; 1522 } 1523 1524 ParamTypes[Idx] = ParamType; 1525 } 1526 1527 if (Invalid) 1528 return QualType(); 1529 1530 FunctionProtoType::ExtProtoInfo EPI; 1531 EPI.Variadic = Variadic; 1532 EPI.HasTrailingReturn = HasTrailingReturn; 1533 EPI.TypeQuals = Quals; 1534 EPI.RefQualifier = RefQualifier; 1535 EPI.ExtInfo = Info; 1536 1537 return Context.getFunctionType(T, ParamTypes, NumParamTypes, EPI); 1538} 1539 1540/// \brief Build a member pointer type \c T Class::*. 1541/// 1542/// \param T the type to which the member pointer refers. 1543/// \param Class the class type into which the member pointer points. 1544/// \param Loc the location where this type begins 1545/// \param Entity the name of the entity that will have this member pointer type 1546/// 1547/// \returns a member pointer type, if successful, or a NULL type if there was 1548/// an error. 1549QualType Sema::BuildMemberPointerType(QualType T, QualType Class, 1550 SourceLocation Loc, 1551 DeclarationName Entity) { 1552 // Verify that we're not building a pointer to pointer to function with 1553 // exception specification. 1554 if (CheckDistantExceptionSpec(T)) { 1555 Diag(Loc, diag::err_distant_exception_spec); 1556 1557 // FIXME: If we're doing this as part of template instantiation, 1558 // we should return immediately. 1559 1560 // Build the type anyway, but use the canonical type so that the 1561 // exception specifiers are stripped off. 1562 T = Context.getCanonicalType(T); 1563 } 1564 1565 // C++ 8.3.3p3: A pointer to member shall not point to ... a member 1566 // with reference type, or "cv void." 1567 if (T->isReferenceType()) { 1568 Diag(Loc, diag::err_illegal_decl_mempointer_to_reference) 1569 << (Entity? Entity.getAsString() : "type name") << T; 1570 return QualType(); 1571 } 1572 1573 if (T->isVoidType()) { 1574 Diag(Loc, diag::err_illegal_decl_mempointer_to_void) 1575 << (Entity? Entity.getAsString() : "type name"); 1576 return QualType(); 1577 } 1578 1579 if (!Class->isDependentType() && !Class->isRecordType()) { 1580 Diag(Loc, diag::err_mempointer_in_nonclass_type) << Class; 1581 return QualType(); 1582 } 1583 1584 // In the Microsoft ABI, the class is allowed to be an incomplete 1585 // type. In such cases, the compiler makes a worst-case assumption. 1586 // We make no such assumption right now, so emit an error if the 1587 // class isn't a complete type. 1588 if (Context.getTargetInfo().getCXXABI() == CXXABI_Microsoft && 1589 RequireCompleteType(Loc, Class, diag::err_incomplete_type)) 1590 return QualType(); 1591 1592 return Context.getMemberPointerType(T, Class.getTypePtr()); 1593} 1594 1595/// \brief Build a block pointer type. 1596/// 1597/// \param T The type to which we'll be building a block pointer. 1598/// 1599/// \param Loc The source location, used for diagnostics. 1600/// 1601/// \param Entity The name of the entity that involves the block pointer 1602/// type, if known. 1603/// 1604/// \returns A suitable block pointer type, if there are no 1605/// errors. Otherwise, returns a NULL type. 1606QualType Sema::BuildBlockPointerType(QualType T, 1607 SourceLocation Loc, 1608 DeclarationName Entity) { 1609 if (!T->isFunctionType()) { 1610 Diag(Loc, diag::err_nonfunction_block_type); 1611 return QualType(); 1612 } 1613 1614 return Context.getBlockPointerType(T); 1615} 1616 1617QualType Sema::GetTypeFromParser(ParsedType Ty, TypeSourceInfo **TInfo) { 1618 QualType QT = Ty.get(); 1619 if (QT.isNull()) { 1620 if (TInfo) *TInfo = 0; 1621 return QualType(); 1622 } 1623 1624 TypeSourceInfo *DI = 0; 1625 if (const LocInfoType *LIT = dyn_cast<LocInfoType>(QT)) { 1626 QT = LIT->getType(); 1627 DI = LIT->getTypeSourceInfo(); 1628 } 1629 1630 if (TInfo) *TInfo = DI; 1631 return QT; 1632} 1633 1634static void transferARCOwnershipToDeclaratorChunk(TypeProcessingState &state, 1635 Qualifiers::ObjCLifetime ownership, 1636 unsigned chunkIndex); 1637 1638/// Given that this is the declaration of a parameter under ARC, 1639/// attempt to infer attributes and such for pointer-to-whatever 1640/// types. 1641static void inferARCWriteback(TypeProcessingState &state, 1642 QualType &declSpecType) { 1643 Sema &S = state.getSema(); 1644 Declarator &declarator = state.getDeclarator(); 1645 1646 // TODO: should we care about decl qualifiers? 1647 1648 // Check whether the declarator has the expected form. We walk 1649 // from the inside out in order to make the block logic work. 1650 unsigned outermostPointerIndex = 0; 1651 bool isBlockPointer = false; 1652 unsigned numPointers = 0; 1653 for (unsigned i = 0, e = declarator.getNumTypeObjects(); i != e; ++i) { 1654 unsigned chunkIndex = i; 1655 DeclaratorChunk &chunk = declarator.getTypeObject(chunkIndex); 1656 switch (chunk.Kind) { 1657 case DeclaratorChunk::Paren: 1658 // Ignore parens. 1659 break; 1660 1661 case DeclaratorChunk::Reference: 1662 case DeclaratorChunk::Pointer: 1663 // Count the number of pointers. Treat references 1664 // interchangeably as pointers; if they're mis-ordered, normal 1665 // type building will discover that. 1666 outermostPointerIndex = chunkIndex; 1667 numPointers++; 1668 break; 1669 1670 case DeclaratorChunk::BlockPointer: 1671 // If we have a pointer to block pointer, that's an acceptable 1672 // indirect reference; anything else is not an application of 1673 // the rules. 1674 if (numPointers != 1) return; 1675 numPointers++; 1676 outermostPointerIndex = chunkIndex; 1677 isBlockPointer = true; 1678 1679 // We don't care about pointer structure in return values here. 1680 goto done; 1681 1682 case DeclaratorChunk::Array: // suppress if written (id[])? 1683 case DeclaratorChunk::Function: 1684 case DeclaratorChunk::MemberPointer: 1685 return; 1686 } 1687 } 1688 done: 1689 1690 // If we have *one* pointer, then we want to throw the qualifier on 1691 // the declaration-specifiers, which means that it needs to be a 1692 // retainable object type. 1693 if (numPointers == 1) { 1694 // If it's not a retainable object type, the rule doesn't apply. 1695 if (!declSpecType->isObjCRetainableType()) return; 1696 1697 // If it already has lifetime, don't do anything. 1698 if (declSpecType.getObjCLifetime()) return; 1699 1700 // Otherwise, modify the type in-place. 1701 Qualifiers qs; 1702 1703 if (declSpecType->isObjCARCImplicitlyUnretainedType()) 1704 qs.addObjCLifetime(Qualifiers::OCL_ExplicitNone); 1705 else 1706 qs.addObjCLifetime(Qualifiers::OCL_Autoreleasing); 1707 declSpecType = S.Context.getQualifiedType(declSpecType, qs); 1708 1709 // If we have *two* pointers, then we want to throw the qualifier on 1710 // the outermost pointer. 1711 } else if (numPointers == 2) { 1712 // If we don't have a block pointer, we need to check whether the 1713 // declaration-specifiers gave us something that will turn into a 1714 // retainable object pointer after we slap the first pointer on it. 1715 if (!isBlockPointer && !declSpecType->isObjCObjectType()) 1716 return; 1717 1718 // Look for an explicit lifetime attribute there. 1719 DeclaratorChunk &chunk = declarator.getTypeObject(outermostPointerIndex); 1720 if (chunk.Kind != DeclaratorChunk::Pointer && 1721 chunk.Kind != DeclaratorChunk::BlockPointer) 1722 return; 1723 for (const AttributeList *attr = chunk.getAttrs(); attr; 1724 attr = attr->getNext()) 1725 if (attr->getKind() == AttributeList::AT_ObjCOwnership) 1726 return; 1727 1728 transferARCOwnershipToDeclaratorChunk(state, Qualifiers::OCL_Autoreleasing, 1729 outermostPointerIndex); 1730 1731 // Any other number of pointers/references does not trigger the rule. 1732 } else return; 1733 1734 // TODO: mark whether we did this inference? 1735} 1736 1737static void DiagnoseIgnoredQualifiers(unsigned Quals, 1738 SourceLocation ConstQualLoc, 1739 SourceLocation VolatileQualLoc, 1740 SourceLocation RestrictQualLoc, 1741 Sema& S) { 1742 std::string QualStr; 1743 unsigned NumQuals = 0; 1744 SourceLocation Loc; 1745 1746 FixItHint ConstFixIt; 1747 FixItHint VolatileFixIt; 1748 FixItHint RestrictFixIt; 1749 1750 const SourceManager &SM = S.getSourceManager(); 1751 1752 // FIXME: The locations here are set kind of arbitrarily. It'd be nicer to 1753 // find a range and grow it to encompass all the qualifiers, regardless of 1754 // the order in which they textually appear. 1755 if (Quals & Qualifiers::Const) { 1756 ConstFixIt = FixItHint::CreateRemoval(ConstQualLoc); 1757 QualStr = "const"; 1758 ++NumQuals; 1759 if (!Loc.isValid() || SM.isBeforeInTranslationUnit(ConstQualLoc, Loc)) 1760 Loc = ConstQualLoc; 1761 } 1762 if (Quals & Qualifiers::Volatile) { 1763 VolatileFixIt = FixItHint::CreateRemoval(VolatileQualLoc); 1764 QualStr += (NumQuals == 0 ? "volatile" : " volatile"); 1765 ++NumQuals; 1766 if (!Loc.isValid() || SM.isBeforeInTranslationUnit(VolatileQualLoc, Loc)) 1767 Loc = VolatileQualLoc; 1768 } 1769 if (Quals & Qualifiers::Restrict) { 1770 RestrictFixIt = FixItHint::CreateRemoval(RestrictQualLoc); 1771 QualStr += (NumQuals == 0 ? "restrict" : " restrict"); 1772 ++NumQuals; 1773 if (!Loc.isValid() || SM.isBeforeInTranslationUnit(RestrictQualLoc, Loc)) 1774 Loc = RestrictQualLoc; 1775 } 1776 1777 assert(NumQuals > 0 && "No known qualifiers?"); 1778 1779 S.Diag(Loc, diag::warn_qual_return_type) 1780 << QualStr << NumQuals << ConstFixIt << VolatileFixIt << RestrictFixIt; 1781} 1782 1783static QualType GetDeclSpecTypeForDeclarator(TypeProcessingState &state, 1784 TypeSourceInfo *&ReturnTypeInfo) { 1785 Sema &SemaRef = state.getSema(); 1786 Declarator &D = state.getDeclarator(); 1787 QualType T; 1788 ReturnTypeInfo = 0; 1789 1790 // The TagDecl owned by the DeclSpec. 1791 TagDecl *OwnedTagDecl = 0; 1792 1793 switch (D.getName().getKind()) { 1794 case UnqualifiedId::IK_ImplicitSelfParam: 1795 case UnqualifiedId::IK_OperatorFunctionId: 1796 case UnqualifiedId::IK_Identifier: 1797 case UnqualifiedId::IK_LiteralOperatorId: 1798 case UnqualifiedId::IK_TemplateId: 1799 T = ConvertDeclSpecToType(state); 1800 1801 if (!D.isInvalidType() && D.getDeclSpec().isTypeSpecOwned()) { 1802 OwnedTagDecl = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 1803 // Owned declaration is embedded in declarator. 1804 OwnedTagDecl->setEmbeddedInDeclarator(true); 1805 } 1806 break; 1807 1808 case UnqualifiedId::IK_ConstructorName: 1809 case UnqualifiedId::IK_ConstructorTemplateId: 1810 case UnqualifiedId::IK_DestructorName: 1811 // Constructors and destructors don't have return types. Use 1812 // "void" instead. 1813 T = SemaRef.Context.VoidTy; 1814 break; 1815 1816 case UnqualifiedId::IK_ConversionFunctionId: 1817 // The result type of a conversion function is the type that it 1818 // converts to. 1819 T = SemaRef.GetTypeFromParser(D.getName().ConversionFunctionId, 1820 &ReturnTypeInfo); 1821 break; 1822 } 1823 1824 if (D.getAttributes()) 1825 distributeTypeAttrsFromDeclarator(state, T); 1826 1827 // C++11 [dcl.spec.auto]p5: reject 'auto' if it is not in an allowed context. 1828 // In C++11, a function declarator using 'auto' must have a trailing return 1829 // type (this is checked later) and we can skip this. In other languages 1830 // using auto, we need to check regardless. 1831 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto && 1832 (!SemaRef.getLangOpts().CPlusPlus0x || !D.isFunctionDeclarator())) { 1833 int Error = -1; 1834 1835 switch (D.getContext()) { 1836 case Declarator::KNRTypeListContext: 1837 llvm_unreachable("K&R type lists aren't allowed in C++"); 1838 case Declarator::LambdaExprContext: 1839 llvm_unreachable("Can't specify a type specifier in lambda grammar"); 1840 case Declarator::ObjCParameterContext: 1841 case Declarator::ObjCResultContext: 1842 case Declarator::PrototypeContext: 1843 Error = 0; // Function prototype 1844 break; 1845 case Declarator::MemberContext: 1846 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_static) 1847 break; 1848 switch (cast<TagDecl>(SemaRef.CurContext)->getTagKind()) { 1849 case TTK_Enum: llvm_unreachable("unhandled tag kind"); 1850 case TTK_Struct: Error = 1; /* Struct member */ break; 1851 case TTK_Union: Error = 2; /* Union member */ break; 1852 case TTK_Class: Error = 3; /* Class member */ break; 1853 } 1854 break; 1855 case Declarator::CXXCatchContext: 1856 case Declarator::ObjCCatchContext: 1857 Error = 4; // Exception declaration 1858 break; 1859 case Declarator::TemplateParamContext: 1860 Error = 5; // Template parameter 1861 break; 1862 case Declarator::BlockLiteralContext: 1863 Error = 6; // Block literal 1864 break; 1865 case Declarator::TemplateTypeArgContext: 1866 Error = 7; // Template type argument 1867 break; 1868 case Declarator::AliasDeclContext: 1869 case Declarator::AliasTemplateContext: 1870 Error = 9; // Type alias 1871 break; 1872 case Declarator::TrailingReturnContext: 1873 Error = 10; // Function return type 1874 break; 1875 case Declarator::TypeNameContext: 1876 Error = 11; // Generic 1877 break; 1878 case Declarator::FileContext: 1879 case Declarator::BlockContext: 1880 case Declarator::ForContext: 1881 case Declarator::ConditionContext: 1882 case Declarator::CXXNewContext: 1883 break; 1884 } 1885 1886 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 1887 Error = 8; 1888 1889 // In Objective-C it is an error to use 'auto' on a function declarator. 1890 if (D.isFunctionDeclarator()) 1891 Error = 10; 1892 1893 // C++11 [dcl.spec.auto]p2: 'auto' is always fine if the declarator 1894 // contains a trailing return type. That is only legal at the outermost 1895 // level. Check all declarator chunks (outermost first) anyway, to give 1896 // better diagnostics. 1897 if (SemaRef.getLangOpts().CPlusPlus0x && Error != -1) { 1898 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 1899 unsigned chunkIndex = e - i - 1; 1900 state.setCurrentChunkIndex(chunkIndex); 1901 DeclaratorChunk &DeclType = D.getTypeObject(chunkIndex); 1902 if (DeclType.Kind == DeclaratorChunk::Function) { 1903 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun; 1904 if (FTI.hasTrailingReturnType()) { 1905 Error = -1; 1906 break; 1907 } 1908 } 1909 } 1910 } 1911 1912 if (Error != -1) { 1913 SemaRef.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 1914 diag::err_auto_not_allowed) 1915 << Error; 1916 T = SemaRef.Context.IntTy; 1917 D.setInvalidType(true); 1918 } else 1919 SemaRef.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 1920 diag::warn_cxx98_compat_auto_type_specifier); 1921 } 1922 1923 if (SemaRef.getLangOpts().CPlusPlus && 1924 OwnedTagDecl && OwnedTagDecl->isCompleteDefinition()) { 1925 // Check the contexts where C++ forbids the declaration of a new class 1926 // or enumeration in a type-specifier-seq. 1927 switch (D.getContext()) { 1928 case Declarator::TrailingReturnContext: 1929 // Class and enumeration definitions are syntactically not allowed in 1930 // trailing return types. 1931 llvm_unreachable("parser should not have allowed this"); 1932 break; 1933 case Declarator::FileContext: 1934 case Declarator::MemberContext: 1935 case Declarator::BlockContext: 1936 case Declarator::ForContext: 1937 case Declarator::BlockLiteralContext: 1938 case Declarator::LambdaExprContext: 1939 // C++11 [dcl.type]p3: 1940 // A type-specifier-seq shall not define a class or enumeration unless 1941 // it appears in the type-id of an alias-declaration (7.1.3) that is not 1942 // the declaration of a template-declaration. 1943 case Declarator::AliasDeclContext: 1944 break; 1945 case Declarator::AliasTemplateContext: 1946 SemaRef.Diag(OwnedTagDecl->getLocation(), 1947 diag::err_type_defined_in_alias_template) 1948 << SemaRef.Context.getTypeDeclType(OwnedTagDecl); 1949 break; 1950 case Declarator::TypeNameContext: 1951 case Declarator::TemplateParamContext: 1952 case Declarator::CXXNewContext: 1953 case Declarator::CXXCatchContext: 1954 case Declarator::ObjCCatchContext: 1955 case Declarator::TemplateTypeArgContext: 1956 SemaRef.Diag(OwnedTagDecl->getLocation(), 1957 diag::err_type_defined_in_type_specifier) 1958 << SemaRef.Context.getTypeDeclType(OwnedTagDecl); 1959 break; 1960 case Declarator::PrototypeContext: 1961 case Declarator::ObjCParameterContext: 1962 case Declarator::ObjCResultContext: 1963 case Declarator::KNRTypeListContext: 1964 // C++ [dcl.fct]p6: 1965 // Types shall not be defined in return or parameter types. 1966 SemaRef.Diag(OwnedTagDecl->getLocation(), 1967 diag::err_type_defined_in_param_type) 1968 << SemaRef.Context.getTypeDeclType(OwnedTagDecl); 1969 break; 1970 case Declarator::ConditionContext: 1971 // C++ 6.4p2: 1972 // The type-specifier-seq shall not contain typedef and shall not declare 1973 // a new class or enumeration. 1974 SemaRef.Diag(OwnedTagDecl->getLocation(), 1975 diag::err_type_defined_in_condition); 1976 break; 1977 } 1978 } 1979 1980 return T; 1981} 1982 1983static std::string getFunctionQualifiersAsString(const FunctionProtoType *FnTy){ 1984 std::string Quals = 1985 Qualifiers::fromCVRMask(FnTy->getTypeQuals()).getAsString(); 1986 1987 switch (FnTy->getRefQualifier()) { 1988 case RQ_None: 1989 break; 1990 1991 case RQ_LValue: 1992 if (!Quals.empty()) 1993 Quals += ' '; 1994 Quals += '&'; 1995 break; 1996 1997 case RQ_RValue: 1998 if (!Quals.empty()) 1999 Quals += ' '; 2000 Quals += "&&"; 2001 break; 2002 } 2003 2004 return Quals; 2005} 2006 2007/// Check that the function type T, which has a cv-qualifier or a ref-qualifier, 2008/// can be contained within the declarator chunk DeclType, and produce an 2009/// appropriate diagnostic if not. 2010static void checkQualifiedFunction(Sema &S, QualType T, 2011 DeclaratorChunk &DeclType) { 2012 // C++98 [dcl.fct]p4 / C++11 [dcl.fct]p6: a function type with a 2013 // cv-qualifier or a ref-qualifier can only appear at the topmost level 2014 // of a type. 2015 int DiagKind = -1; 2016 switch (DeclType.Kind) { 2017 case DeclaratorChunk::Paren: 2018 case DeclaratorChunk::MemberPointer: 2019 // These cases are permitted. 2020 return; 2021 case DeclaratorChunk::Array: 2022 case DeclaratorChunk::Function: 2023 // These cases don't allow function types at all; no need to diagnose the 2024 // qualifiers separately. 2025 return; 2026 case DeclaratorChunk::BlockPointer: 2027 DiagKind = 0; 2028 break; 2029 case DeclaratorChunk::Pointer: 2030 DiagKind = 1; 2031 break; 2032 case DeclaratorChunk::Reference: 2033 DiagKind = 2; 2034 break; 2035 } 2036 2037 assert(DiagKind != -1); 2038 S.Diag(DeclType.Loc, diag::err_compound_qualified_function_type) 2039 << DiagKind << isa<FunctionType>(T.IgnoreParens()) << T 2040 << getFunctionQualifiersAsString(T->castAs<FunctionProtoType>()); 2041} 2042 2043static TypeSourceInfo *GetFullTypeForDeclarator(TypeProcessingState &state, 2044 QualType declSpecType, 2045 TypeSourceInfo *TInfo) { 2046 2047 QualType T = declSpecType; 2048 Declarator &D = state.getDeclarator(); 2049 Sema &S = state.getSema(); 2050 ASTContext &Context = S.Context; 2051 const LangOptions &LangOpts = S.getLangOpts(); 2052 2053 bool ImplicitlyNoexcept = false; 2054 if (D.getName().getKind() == UnqualifiedId::IK_OperatorFunctionId && 2055 LangOpts.CPlusPlus0x) { 2056 OverloadedOperatorKind OO = D.getName().OperatorFunctionId.Operator; 2057 /// In C++0x, deallocation functions (normal and array operator delete) 2058 /// are implicitly noexcept. 2059 if (OO == OO_Delete || OO == OO_Array_Delete) 2060 ImplicitlyNoexcept = true; 2061 } 2062 2063 // The name we're declaring, if any. 2064 DeclarationName Name; 2065 if (D.getIdentifier()) 2066 Name = D.getIdentifier(); 2067 2068 // Does this declaration declare a typedef-name? 2069 bool IsTypedefName = 2070 D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef || 2071 D.getContext() == Declarator::AliasDeclContext || 2072 D.getContext() == Declarator::AliasTemplateContext; 2073 2074 // Does T refer to a function type with a cv-qualifier or a ref-qualifier? 2075 bool IsQualifiedFunction = T->isFunctionProtoType() && 2076 (T->castAs<FunctionProtoType>()->getTypeQuals() != 0 || 2077 T->castAs<FunctionProtoType>()->getRefQualifier() != RQ_None); 2078 2079 // Walk the DeclTypeInfo, building the recursive type as we go. 2080 // DeclTypeInfos are ordered from the identifier out, which is 2081 // opposite of what we want :). 2082 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 2083 unsigned chunkIndex = e - i - 1; 2084 state.setCurrentChunkIndex(chunkIndex); 2085 DeclaratorChunk &DeclType = D.getTypeObject(chunkIndex); 2086 if (IsQualifiedFunction) { 2087 checkQualifiedFunction(S, T, DeclType); 2088 IsQualifiedFunction = DeclType.Kind == DeclaratorChunk::Paren; 2089 } 2090 switch (DeclType.Kind) { 2091 case DeclaratorChunk::Paren: 2092 T = S.BuildParenType(T); 2093 break; 2094 case DeclaratorChunk::BlockPointer: 2095 // If blocks are disabled, emit an error. 2096 if (!LangOpts.Blocks) 2097 S.Diag(DeclType.Loc, diag::err_blocks_disable); 2098 2099 T = S.BuildBlockPointerType(T, D.getIdentifierLoc(), Name); 2100 if (DeclType.Cls.TypeQuals) 2101 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Cls.TypeQuals); 2102 break; 2103 case DeclaratorChunk::Pointer: 2104 // Verify that we're not building a pointer to pointer to function with 2105 // exception specification. 2106 if (LangOpts.CPlusPlus && S.CheckDistantExceptionSpec(T)) { 2107 S.Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 2108 D.setInvalidType(true); 2109 // Build the type anyway. 2110 } 2111 if (LangOpts.ObjC1 && T->getAs<ObjCObjectType>()) { 2112 T = Context.getObjCObjectPointerType(T); 2113 if (DeclType.Ptr.TypeQuals) 2114 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Ptr.TypeQuals); 2115 break; 2116 } 2117 T = S.BuildPointerType(T, DeclType.Loc, Name); 2118 if (DeclType.Ptr.TypeQuals) 2119 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Ptr.TypeQuals); 2120 2121 break; 2122 case DeclaratorChunk::Reference: { 2123 // Verify that we're not building a reference to pointer to function with 2124 // exception specification. 2125 if (LangOpts.CPlusPlus && S.CheckDistantExceptionSpec(T)) { 2126 S.Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 2127 D.setInvalidType(true); 2128 // Build the type anyway. 2129 } 2130 T = S.BuildReferenceType(T, DeclType.Ref.LValueRef, DeclType.Loc, Name); 2131 2132 Qualifiers Quals; 2133 if (DeclType.Ref.HasRestrict) 2134 T = S.BuildQualifiedType(T, DeclType.Loc, Qualifiers::Restrict); 2135 break; 2136 } 2137 case DeclaratorChunk::Array: { 2138 // Verify that we're not building an array of pointers to function with 2139 // exception specification. 2140 if (LangOpts.CPlusPlus && S.CheckDistantExceptionSpec(T)) { 2141 S.Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 2142 D.setInvalidType(true); 2143 // Build the type anyway. 2144 } 2145 DeclaratorChunk::ArrayTypeInfo &ATI = DeclType.Arr; 2146 Expr *ArraySize = static_cast<Expr*>(ATI.NumElts); 2147 ArrayType::ArraySizeModifier ASM; 2148 if (ATI.isStar) 2149 ASM = ArrayType::Star; 2150 else if (ATI.hasStatic) 2151 ASM = ArrayType::Static; 2152 else 2153 ASM = ArrayType::Normal; 2154 if (ASM == ArrayType::Star && !D.isPrototypeContext()) { 2155 // FIXME: This check isn't quite right: it allows star in prototypes 2156 // for function definitions, and disallows some edge cases detailed 2157 // in http://gcc.gnu.org/ml/gcc-patches/2009-02/msg00133.html 2158 S.Diag(DeclType.Loc, diag::err_array_star_outside_prototype); 2159 ASM = ArrayType::Normal; 2160 D.setInvalidType(true); 2161 } 2162 T = S.BuildArrayType(T, ASM, ArraySize, ATI.TypeQuals, 2163 SourceRange(DeclType.Loc, DeclType.EndLoc), Name); 2164 break; 2165 } 2166 case DeclaratorChunk::Function: { 2167 // If the function declarator has a prototype (i.e. it is not () and 2168 // does not have a K&R-style identifier list), then the arguments are part 2169 // of the type, otherwise the argument list is (). 2170 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun; 2171 IsQualifiedFunction = FTI.TypeQuals || FTI.hasRefQualifier(); 2172 2173 // Check for auto functions and trailing return type and adjust the 2174 // return type accordingly. 2175 if (!D.isInvalidType()) { 2176 // trailing-return-type is only required if we're declaring a function, 2177 // and not, for instance, a pointer to a function. 2178 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto && 2179 !FTI.hasTrailingReturnType() && chunkIndex == 0) { 2180 S.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 2181 diag::err_auto_missing_trailing_return); 2182 T = Context.IntTy; 2183 D.setInvalidType(true); 2184 } else if (FTI.hasTrailingReturnType()) { 2185 // T must be exactly 'auto' at this point. See CWG issue 681. 2186 if (isa<ParenType>(T)) { 2187 S.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 2188 diag::err_trailing_return_in_parens) 2189 << T << D.getDeclSpec().getSourceRange(); 2190 D.setInvalidType(true); 2191 } else if (D.getContext() != Declarator::LambdaExprContext && 2192 (T.hasQualifiers() || !isa<AutoType>(T))) { 2193 S.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 2194 diag::err_trailing_return_without_auto) 2195 << T << D.getDeclSpec().getSourceRange(); 2196 D.setInvalidType(true); 2197 } 2198 T = S.GetTypeFromParser(FTI.getTrailingReturnType(), &TInfo); 2199 if (T.isNull()) { 2200 // An error occurred parsing the trailing return type. 2201 T = Context.IntTy; 2202 D.setInvalidType(true); 2203 } 2204 } 2205 } 2206 2207 // C99 6.7.5.3p1: The return type may not be a function or array type. 2208 // For conversion functions, we'll diagnose this particular error later. 2209 if ((T->isArrayType() || T->isFunctionType()) && 2210 (D.getName().getKind() != UnqualifiedId::IK_ConversionFunctionId)) { 2211 unsigned diagID = diag::err_func_returning_array_function; 2212 // Last processing chunk in block context means this function chunk 2213 // represents the block. 2214 if (chunkIndex == 0 && 2215 D.getContext() == Declarator::BlockLiteralContext) 2216 diagID = diag::err_block_returning_array_function; 2217 S.Diag(DeclType.Loc, diagID) << T->isFunctionType() << T; 2218 T = Context.IntTy; 2219 D.setInvalidType(true); 2220 } 2221 2222 // Do not allow returning half FP value. 2223 // FIXME: This really should be in BuildFunctionType. 2224 if (T->isHalfType()) { 2225 S.Diag(D.getIdentifierLoc(), 2226 diag::err_parameters_retval_cannot_have_fp16_type) << 1 2227 << FixItHint::CreateInsertion(D.getIdentifierLoc(), "*"); 2228 D.setInvalidType(true); 2229 } 2230 2231 // cv-qualifiers on return types are pointless except when the type is a 2232 // class type in C++. 2233 if (isa<PointerType>(T) && T.getLocalCVRQualifiers() && 2234 (D.getName().getKind() != UnqualifiedId::IK_ConversionFunctionId) && 2235 (!LangOpts.CPlusPlus || !T->isDependentType())) { 2236 assert(chunkIndex + 1 < e && "No DeclaratorChunk for the return type?"); 2237 DeclaratorChunk ReturnTypeChunk = D.getTypeObject(chunkIndex + 1); 2238 assert(ReturnTypeChunk.Kind == DeclaratorChunk::Pointer); 2239 2240 DeclaratorChunk::PointerTypeInfo &PTI = ReturnTypeChunk.Ptr; 2241 2242 DiagnoseIgnoredQualifiers(PTI.TypeQuals, 2243 SourceLocation::getFromRawEncoding(PTI.ConstQualLoc), 2244 SourceLocation::getFromRawEncoding(PTI.VolatileQualLoc), 2245 SourceLocation::getFromRawEncoding(PTI.RestrictQualLoc), 2246 S); 2247 2248 } else if (T.getCVRQualifiers() && D.getDeclSpec().getTypeQualifiers() && 2249 (!LangOpts.CPlusPlus || 2250 (!T->isDependentType() && !T->isRecordType()))) { 2251 2252 DiagnoseIgnoredQualifiers(D.getDeclSpec().getTypeQualifiers(), 2253 D.getDeclSpec().getConstSpecLoc(), 2254 D.getDeclSpec().getVolatileSpecLoc(), 2255 D.getDeclSpec().getRestrictSpecLoc(), 2256 S); 2257 } 2258 2259 if (LangOpts.CPlusPlus && D.getDeclSpec().isTypeSpecOwned()) { 2260 // C++ [dcl.fct]p6: 2261 // Types shall not be defined in return or parameter types. 2262 TagDecl *Tag = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 2263 if (Tag->isCompleteDefinition()) 2264 S.Diag(Tag->getLocation(), diag::err_type_defined_in_result_type) 2265 << Context.getTypeDeclType(Tag); 2266 } 2267 2268 // Exception specs are not allowed in typedefs. Complain, but add it 2269 // anyway. 2270 if (IsTypedefName && FTI.getExceptionSpecType()) 2271 S.Diag(FTI.getExceptionSpecLoc(), diag::err_exception_spec_in_typedef) 2272 << (D.getContext() == Declarator::AliasDeclContext || 2273 D.getContext() == Declarator::AliasTemplateContext); 2274 2275 if (!FTI.NumArgs && !FTI.isVariadic && !LangOpts.CPlusPlus) { 2276 // Simple void foo(), where the incoming T is the result type. 2277 T = Context.getFunctionNoProtoType(T); 2278 } else { 2279 // We allow a zero-parameter variadic function in C if the 2280 // function is marked with the "overloadable" attribute. Scan 2281 // for this attribute now. 2282 if (!FTI.NumArgs && FTI.isVariadic && !LangOpts.CPlusPlus) { 2283 bool Overloadable = false; 2284 for (const AttributeList *Attrs = D.getAttributes(); 2285 Attrs; Attrs = Attrs->getNext()) { 2286 if (Attrs->getKind() == AttributeList::AT_Overloadable) { 2287 Overloadable = true; 2288 break; 2289 } 2290 } 2291 2292 if (!Overloadable) 2293 S.Diag(FTI.getEllipsisLoc(), diag::err_ellipsis_first_arg); 2294 } 2295 2296 if (FTI.NumArgs && FTI.ArgInfo[0].Param == 0) { 2297 // C99 6.7.5.3p3: Reject int(x,y,z) when it's not a function 2298 // definition. 2299 S.Diag(FTI.ArgInfo[0].IdentLoc, diag::err_ident_list_in_fn_declaration); 2300 D.setInvalidType(true); 2301 break; 2302 } 2303 2304 FunctionProtoType::ExtProtoInfo EPI; 2305 EPI.Variadic = FTI.isVariadic; 2306 EPI.HasTrailingReturn = FTI.hasTrailingReturnType(); 2307 EPI.TypeQuals = FTI.TypeQuals; 2308 EPI.RefQualifier = !FTI.hasRefQualifier()? RQ_None 2309 : FTI.RefQualifierIsLValueRef? RQ_LValue 2310 : RQ_RValue; 2311 2312 // Otherwise, we have a function with an argument list that is 2313 // potentially variadic. 2314 SmallVector<QualType, 16> ArgTys; 2315 ArgTys.reserve(FTI.NumArgs); 2316 2317 SmallVector<bool, 16> ConsumedArguments; 2318 ConsumedArguments.reserve(FTI.NumArgs); 2319 bool HasAnyConsumedArguments = false; 2320 2321 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 2322 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 2323 QualType ArgTy = Param->getType(); 2324 assert(!ArgTy.isNull() && "Couldn't parse type?"); 2325 2326 // Adjust the parameter type. 2327 assert((ArgTy == Context.getAdjustedParameterType(ArgTy)) && 2328 "Unadjusted type?"); 2329 2330 // Look for 'void'. void is allowed only as a single argument to a 2331 // function with no other parameters (C99 6.7.5.3p10). We record 2332 // int(void) as a FunctionProtoType with an empty argument list. 2333 if (ArgTy->isVoidType()) { 2334 // If this is something like 'float(int, void)', reject it. 'void' 2335 // is an incomplete type (C99 6.2.5p19) and function decls cannot 2336 // have arguments of incomplete type. 2337 if (FTI.NumArgs != 1 || FTI.isVariadic) { 2338 S.Diag(DeclType.Loc, diag::err_void_only_param); 2339 ArgTy = Context.IntTy; 2340 Param->setType(ArgTy); 2341 } else if (FTI.ArgInfo[i].Ident) { 2342 // Reject, but continue to parse 'int(void abc)'. 2343 S.Diag(FTI.ArgInfo[i].IdentLoc, 2344 diag::err_param_with_void_type); 2345 ArgTy = Context.IntTy; 2346 Param->setType(ArgTy); 2347 } else { 2348 // Reject, but continue to parse 'float(const void)'. 2349 if (ArgTy.hasQualifiers()) 2350 S.Diag(DeclType.Loc, diag::err_void_param_qualified); 2351 2352 // Do not add 'void' to the ArgTys list. 2353 break; 2354 } 2355 } else if (ArgTy->isHalfType()) { 2356 // Disallow half FP arguments. 2357 // FIXME: This really should be in BuildFunctionType. 2358 S.Diag(Param->getLocation(), 2359 diag::err_parameters_retval_cannot_have_fp16_type) << 0 2360 << FixItHint::CreateInsertion(Param->getLocation(), "*"); 2361 D.setInvalidType(); 2362 } else if (!FTI.hasPrototype) { 2363 if (ArgTy->isPromotableIntegerType()) { 2364 ArgTy = Context.getPromotedIntegerType(ArgTy); 2365 Param->setKNRPromoted(true); 2366 } else if (const BuiltinType* BTy = ArgTy->getAs<BuiltinType>()) { 2367 if (BTy->getKind() == BuiltinType::Float) { 2368 ArgTy = Context.DoubleTy; 2369 Param->setKNRPromoted(true); 2370 } 2371 } 2372 } 2373 2374 if (LangOpts.ObjCAutoRefCount) { 2375 bool Consumed = Param->hasAttr<NSConsumedAttr>(); 2376 ConsumedArguments.push_back(Consumed); 2377 HasAnyConsumedArguments |= Consumed; 2378 } 2379 2380 ArgTys.push_back(ArgTy); 2381 } 2382 2383 if (HasAnyConsumedArguments) 2384 EPI.ConsumedArguments = ConsumedArguments.data(); 2385 2386 SmallVector<QualType, 4> Exceptions; 2387 SmallVector<ParsedType, 2> DynamicExceptions; 2388 SmallVector<SourceRange, 2> DynamicExceptionRanges; 2389 Expr *NoexceptExpr = 0; 2390 2391 if (FTI.getExceptionSpecType() == EST_Dynamic) { 2392 // FIXME: It's rather inefficient to have to split into two vectors 2393 // here. 2394 unsigned N = FTI.NumExceptions; 2395 DynamicExceptions.reserve(N); 2396 DynamicExceptionRanges.reserve(N); 2397 for (unsigned I = 0; I != N; ++I) { 2398 DynamicExceptions.push_back(FTI.Exceptions[I].Ty); 2399 DynamicExceptionRanges.push_back(FTI.Exceptions[I].Range); 2400 } 2401 } else if (FTI.getExceptionSpecType() == EST_ComputedNoexcept) { 2402 NoexceptExpr = FTI.NoexceptExpr; 2403 } 2404 2405 S.checkExceptionSpecification(FTI.getExceptionSpecType(), 2406 DynamicExceptions, 2407 DynamicExceptionRanges, 2408 NoexceptExpr, 2409 Exceptions, 2410 EPI); 2411 2412 if (FTI.getExceptionSpecType() == EST_None && 2413 ImplicitlyNoexcept && chunkIndex == 0) { 2414 // Only the outermost chunk is marked noexcept, of course. 2415 EPI.ExceptionSpecType = EST_BasicNoexcept; 2416 } 2417 2418 T = Context.getFunctionType(T, ArgTys.data(), ArgTys.size(), EPI); 2419 } 2420 2421 break; 2422 } 2423 case DeclaratorChunk::MemberPointer: 2424 // The scope spec must refer to a class, or be dependent. 2425 CXXScopeSpec &SS = DeclType.Mem.Scope(); 2426 QualType ClsType; 2427 if (SS.isInvalid()) { 2428 // Avoid emitting extra errors if we already errored on the scope. 2429 D.setInvalidType(true); 2430 } else if (S.isDependentScopeSpecifier(SS) || 2431 dyn_cast_or_null<CXXRecordDecl>(S.computeDeclContext(SS))) { 2432 NestedNameSpecifier *NNS 2433 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 2434 NestedNameSpecifier *NNSPrefix = NNS->getPrefix(); 2435 switch (NNS->getKind()) { 2436 case NestedNameSpecifier::Identifier: 2437 ClsType = Context.getDependentNameType(ETK_None, NNSPrefix, 2438 NNS->getAsIdentifier()); 2439 break; 2440 2441 case NestedNameSpecifier::Namespace: 2442 case NestedNameSpecifier::NamespaceAlias: 2443 case NestedNameSpecifier::Global: 2444 llvm_unreachable("Nested-name-specifier must name a type"); 2445 2446 case NestedNameSpecifier::TypeSpec: 2447 case NestedNameSpecifier::TypeSpecWithTemplate: 2448 ClsType = QualType(NNS->getAsType(), 0); 2449 // Note: if the NNS has a prefix and ClsType is a nondependent 2450 // TemplateSpecializationType, then the NNS prefix is NOT included 2451 // in ClsType; hence we wrap ClsType into an ElaboratedType. 2452 // NOTE: in particular, no wrap occurs if ClsType already is an 2453 // Elaborated, DependentName, or DependentTemplateSpecialization. 2454 if (NNSPrefix && isa<TemplateSpecializationType>(NNS->getAsType())) 2455 ClsType = Context.getElaboratedType(ETK_None, NNSPrefix, ClsType); 2456 break; 2457 } 2458 } else { 2459 S.Diag(DeclType.Mem.Scope().getBeginLoc(), 2460 diag::err_illegal_decl_mempointer_in_nonclass) 2461 << (D.getIdentifier() ? D.getIdentifier()->getName() : "type name") 2462 << DeclType.Mem.Scope().getRange(); 2463 D.setInvalidType(true); 2464 } 2465 2466 if (!ClsType.isNull()) 2467 T = S.BuildMemberPointerType(T, ClsType, DeclType.Loc, D.getIdentifier()); 2468 if (T.isNull()) { 2469 T = Context.IntTy; 2470 D.setInvalidType(true); 2471 } else if (DeclType.Mem.TypeQuals) { 2472 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Mem.TypeQuals); 2473 } 2474 break; 2475 } 2476 2477 if (T.isNull()) { 2478 D.setInvalidType(true); 2479 T = Context.IntTy; 2480 } 2481 2482 // See if there are any attributes on this declarator chunk. 2483 if (AttributeList *attrs = const_cast<AttributeList*>(DeclType.getAttrs())) 2484 processTypeAttrs(state, T, false, attrs); 2485 } 2486 2487 if (LangOpts.CPlusPlus && T->isFunctionType()) { 2488 const FunctionProtoType *FnTy = T->getAs<FunctionProtoType>(); 2489 assert(FnTy && "Why oh why is there not a FunctionProtoType here?"); 2490 2491 // C++ 8.3.5p4: 2492 // A cv-qualifier-seq shall only be part of the function type 2493 // for a nonstatic member function, the function type to which a pointer 2494 // to member refers, or the top-level function type of a function typedef 2495 // declaration. 2496 // 2497 // Core issue 547 also allows cv-qualifiers on function types that are 2498 // top-level template type arguments. 2499 bool FreeFunction; 2500 if (!D.getCXXScopeSpec().isSet()) { 2501 FreeFunction = ((D.getContext() != Declarator::MemberContext && 2502 D.getContext() != Declarator::LambdaExprContext) || 2503 D.getDeclSpec().isFriendSpecified()); 2504 } else { 2505 DeclContext *DC = S.computeDeclContext(D.getCXXScopeSpec()); 2506 FreeFunction = (DC && !DC->isRecord()); 2507 } 2508 2509 // C++0x [dcl.constexpr]p8: A constexpr specifier for a non-static member 2510 // function that is not a constructor declares that function to be const. 2511 if (D.getDeclSpec().isConstexprSpecified() && !FreeFunction && 2512 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static && 2513 D.getName().getKind() != UnqualifiedId::IK_ConstructorName && 2514 D.getName().getKind() != UnqualifiedId::IK_ConstructorTemplateId && 2515 !(FnTy->getTypeQuals() & DeclSpec::TQ_const)) { 2516 // Rebuild function type adding a 'const' qualifier. 2517 FunctionProtoType::ExtProtoInfo EPI = FnTy->getExtProtoInfo(); 2518 EPI.TypeQuals |= DeclSpec::TQ_const; 2519 T = Context.getFunctionType(FnTy->getResultType(), 2520 FnTy->arg_type_begin(), 2521 FnTy->getNumArgs(), EPI); 2522 } 2523 2524 // C++11 [dcl.fct]p6 (w/DR1417): 2525 // An attempt to specify a function type with a cv-qualifier-seq or a 2526 // ref-qualifier (including by typedef-name) is ill-formed unless it is: 2527 // - the function type for a non-static member function, 2528 // - the function type to which a pointer to member refers, 2529 // - the top-level function type of a function typedef declaration or 2530 // alias-declaration, 2531 // - the type-id in the default argument of a type-parameter, or 2532 // - the type-id of a template-argument for a type-parameter 2533 if (IsQualifiedFunction && 2534 !(!FreeFunction && 2535 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) && 2536 !IsTypedefName && 2537 D.getContext() != Declarator::TemplateTypeArgContext) { 2538 SourceLocation Loc = D.getLocStart(); 2539 SourceRange RemovalRange; 2540 unsigned I; 2541 if (D.isFunctionDeclarator(I)) { 2542 SmallVector<SourceLocation, 4> RemovalLocs; 2543 const DeclaratorChunk &Chunk = D.getTypeObject(I); 2544 assert(Chunk.Kind == DeclaratorChunk::Function); 2545 if (Chunk.Fun.hasRefQualifier()) 2546 RemovalLocs.push_back(Chunk.Fun.getRefQualifierLoc()); 2547 if (Chunk.Fun.TypeQuals & Qualifiers::Const) 2548 RemovalLocs.push_back(Chunk.Fun.getConstQualifierLoc()); 2549 if (Chunk.Fun.TypeQuals & Qualifiers::Volatile) 2550 RemovalLocs.push_back(Chunk.Fun.getVolatileQualifierLoc()); 2551 // FIXME: We do not track the location of the __restrict qualifier. 2552 //if (Chunk.Fun.TypeQuals & Qualifiers::Restrict) 2553 // RemovalLocs.push_back(Chunk.Fun.getRestrictQualifierLoc()); 2554 if (!RemovalLocs.empty()) { 2555 std::sort(RemovalLocs.begin(), RemovalLocs.end(), 2556 BeforeThanCompare<SourceLocation>(S.getSourceManager())); 2557 RemovalRange = SourceRange(RemovalLocs.front(), RemovalLocs.back()); 2558 Loc = RemovalLocs.front(); 2559 } 2560 } 2561 2562 S.Diag(Loc, diag::err_invalid_qualified_function_type) 2563 << FreeFunction << D.isFunctionDeclarator() << T 2564 << getFunctionQualifiersAsString(FnTy) 2565 << FixItHint::CreateRemoval(RemovalRange); 2566 2567 // Strip the cv-qualifiers and ref-qualifiers from the type. 2568 FunctionProtoType::ExtProtoInfo EPI = FnTy->getExtProtoInfo(); 2569 EPI.TypeQuals = 0; 2570 EPI.RefQualifier = RQ_None; 2571 2572 T = Context.getFunctionType(FnTy->getResultType(), 2573 FnTy->arg_type_begin(), 2574 FnTy->getNumArgs(), EPI); 2575 } 2576 } 2577 2578 // Apply any undistributed attributes from the declarator. 2579 if (!T.isNull()) 2580 if (AttributeList *attrs = D.getAttributes()) 2581 processTypeAttrs(state, T, false, attrs); 2582 2583 // Diagnose any ignored type attributes. 2584 if (!T.isNull()) state.diagnoseIgnoredTypeAttrs(T); 2585 2586 // C++0x [dcl.constexpr]p9: 2587 // A constexpr specifier used in an object declaration declares the object 2588 // as const. 2589 if (D.getDeclSpec().isConstexprSpecified() && T->isObjectType()) { 2590 T.addConst(); 2591 } 2592 2593 // If there was an ellipsis in the declarator, the declaration declares a 2594 // parameter pack whose type may be a pack expansion type. 2595 if (D.hasEllipsis() && !T.isNull()) { 2596 // C++0x [dcl.fct]p13: 2597 // A declarator-id or abstract-declarator containing an ellipsis shall 2598 // only be used in a parameter-declaration. Such a parameter-declaration 2599 // is a parameter pack (14.5.3). [...] 2600 switch (D.getContext()) { 2601 case Declarator::PrototypeContext: 2602 // C++0x [dcl.fct]p13: 2603 // [...] When it is part of a parameter-declaration-clause, the 2604 // parameter pack is a function parameter pack (14.5.3). The type T 2605 // of the declarator-id of the function parameter pack shall contain 2606 // a template parameter pack; each template parameter pack in T is 2607 // expanded by the function parameter pack. 2608 // 2609 // We represent function parameter packs as function parameters whose 2610 // type is a pack expansion. 2611 if (!T->containsUnexpandedParameterPack()) { 2612 S.Diag(D.getEllipsisLoc(), 2613 diag::err_function_parameter_pack_without_parameter_packs) 2614 << T << D.getSourceRange(); 2615 D.setEllipsisLoc(SourceLocation()); 2616 } else { 2617 T = Context.getPackExpansionType(T, llvm::Optional<unsigned>()); 2618 } 2619 break; 2620 2621 case Declarator::TemplateParamContext: 2622 // C++0x [temp.param]p15: 2623 // If a template-parameter is a [...] is a parameter-declaration that 2624 // declares a parameter pack (8.3.5), then the template-parameter is a 2625 // template parameter pack (14.5.3). 2626 // 2627 // Note: core issue 778 clarifies that, if there are any unexpanded 2628 // parameter packs in the type of the non-type template parameter, then 2629 // it expands those parameter packs. 2630 if (T->containsUnexpandedParameterPack()) 2631 T = Context.getPackExpansionType(T, llvm::Optional<unsigned>()); 2632 else 2633 S.Diag(D.getEllipsisLoc(), 2634 LangOpts.CPlusPlus0x 2635 ? diag::warn_cxx98_compat_variadic_templates 2636 : diag::ext_variadic_templates); 2637 break; 2638 2639 case Declarator::FileContext: 2640 case Declarator::KNRTypeListContext: 2641 case Declarator::ObjCParameterContext: // FIXME: special diagnostic here? 2642 case Declarator::ObjCResultContext: // FIXME: special diagnostic here? 2643 case Declarator::TypeNameContext: 2644 case Declarator::CXXNewContext: 2645 case Declarator::AliasDeclContext: 2646 case Declarator::AliasTemplateContext: 2647 case Declarator::MemberContext: 2648 case Declarator::BlockContext: 2649 case Declarator::ForContext: 2650 case Declarator::ConditionContext: 2651 case Declarator::CXXCatchContext: 2652 case Declarator::ObjCCatchContext: 2653 case Declarator::BlockLiteralContext: 2654 case Declarator::LambdaExprContext: 2655 case Declarator::TrailingReturnContext: 2656 case Declarator::TemplateTypeArgContext: 2657 // FIXME: We may want to allow parameter packs in block-literal contexts 2658 // in the future. 2659 S.Diag(D.getEllipsisLoc(), diag::err_ellipsis_in_declarator_not_parameter); 2660 D.setEllipsisLoc(SourceLocation()); 2661 break; 2662 } 2663 } 2664 2665 if (T.isNull()) 2666 return Context.getNullTypeSourceInfo(); 2667 else if (D.isInvalidType()) 2668 return Context.getTrivialTypeSourceInfo(T); 2669 2670 return S.GetTypeSourceInfoForDeclarator(D, T, TInfo); 2671} 2672 2673/// GetTypeForDeclarator - Convert the type for the specified 2674/// declarator to Type instances. 2675/// 2676/// The result of this call will never be null, but the associated 2677/// type may be a null type if there's an unrecoverable error. 2678TypeSourceInfo *Sema::GetTypeForDeclarator(Declarator &D, Scope *S) { 2679 // Determine the type of the declarator. Not all forms of declarator 2680 // have a type. 2681 2682 TypeProcessingState state(*this, D); 2683 2684 TypeSourceInfo *ReturnTypeInfo = 0; 2685 QualType T = GetDeclSpecTypeForDeclarator(state, ReturnTypeInfo); 2686 if (T.isNull()) 2687 return Context.getNullTypeSourceInfo(); 2688 2689 if (D.isPrototypeContext() && getLangOpts().ObjCAutoRefCount) 2690 inferARCWriteback(state, T); 2691 2692 return GetFullTypeForDeclarator(state, T, ReturnTypeInfo); 2693} 2694 2695static void transferARCOwnershipToDeclSpec(Sema &S, 2696 QualType &declSpecTy, 2697 Qualifiers::ObjCLifetime ownership) { 2698 if (declSpecTy->isObjCRetainableType() && 2699 declSpecTy.getObjCLifetime() == Qualifiers::OCL_None) { 2700 Qualifiers qs; 2701 qs.addObjCLifetime(ownership); 2702 declSpecTy = S.Context.getQualifiedType(declSpecTy, qs); 2703 } 2704} 2705 2706static void transferARCOwnershipToDeclaratorChunk(TypeProcessingState &state, 2707 Qualifiers::ObjCLifetime ownership, 2708 unsigned chunkIndex) { 2709 Sema &S = state.getSema(); 2710 Declarator &D = state.getDeclarator(); 2711 2712 // Look for an explicit lifetime attribute. 2713 DeclaratorChunk &chunk = D.getTypeObject(chunkIndex); 2714 for (const AttributeList *attr = chunk.getAttrs(); attr; 2715 attr = attr->getNext()) 2716 if (attr->getKind() == AttributeList::AT_ObjCOwnership) 2717 return; 2718 2719 const char *attrStr = 0; 2720 switch (ownership) { 2721 case Qualifiers::OCL_None: llvm_unreachable("no ownership!"); 2722 case Qualifiers::OCL_ExplicitNone: attrStr = "none"; break; 2723 case Qualifiers::OCL_Strong: attrStr = "strong"; break; 2724 case Qualifiers::OCL_Weak: attrStr = "weak"; break; 2725 case Qualifiers::OCL_Autoreleasing: attrStr = "autoreleasing"; break; 2726 } 2727 2728 // If there wasn't one, add one (with an invalid source location 2729 // so that we don't make an AttributedType for it). 2730 AttributeList *attr = D.getAttributePool() 2731 .create(&S.Context.Idents.get("objc_ownership"), SourceLocation(), 2732 /*scope*/ 0, SourceLocation(), 2733 &S.Context.Idents.get(attrStr), SourceLocation(), 2734 /*args*/ 0, 0, AttributeList::AS_GNU); 2735 spliceAttrIntoList(*attr, chunk.getAttrListRef()); 2736 2737 // TODO: mark whether we did this inference? 2738} 2739 2740/// \brief Used for transferring ownership in casts resulting in l-values. 2741static void transferARCOwnership(TypeProcessingState &state, 2742 QualType &declSpecTy, 2743 Qualifiers::ObjCLifetime ownership) { 2744 Sema &S = state.getSema(); 2745 Declarator &D = state.getDeclarator(); 2746 2747 int inner = -1; 2748 bool hasIndirection = false; 2749 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 2750 DeclaratorChunk &chunk = D.getTypeObject(i); 2751 switch (chunk.Kind) { 2752 case DeclaratorChunk::Paren: 2753 // Ignore parens. 2754 break; 2755 2756 case DeclaratorChunk::Array: 2757 case DeclaratorChunk::Reference: 2758 case DeclaratorChunk::Pointer: 2759 if (inner != -1) 2760 hasIndirection = true; 2761 inner = i; 2762 break; 2763 2764 case DeclaratorChunk::BlockPointer: 2765 if (inner != -1) 2766 transferARCOwnershipToDeclaratorChunk(state, ownership, i); 2767 return; 2768 2769 case DeclaratorChunk::Function: 2770 case DeclaratorChunk::MemberPointer: 2771 return; 2772 } 2773 } 2774 2775 if (inner == -1) 2776 return; 2777 2778 DeclaratorChunk &chunk = D.getTypeObject(inner); 2779 if (chunk.Kind == DeclaratorChunk::Pointer) { 2780 if (declSpecTy->isObjCRetainableType()) 2781 return transferARCOwnershipToDeclSpec(S, declSpecTy, ownership); 2782 if (declSpecTy->isObjCObjectType() && hasIndirection) 2783 return transferARCOwnershipToDeclaratorChunk(state, ownership, inner); 2784 } else { 2785 assert(chunk.Kind == DeclaratorChunk::Array || 2786 chunk.Kind == DeclaratorChunk::Reference); 2787 return transferARCOwnershipToDeclSpec(S, declSpecTy, ownership); 2788 } 2789} 2790 2791TypeSourceInfo *Sema::GetTypeForDeclaratorCast(Declarator &D, QualType FromTy) { 2792 TypeProcessingState state(*this, D); 2793 2794 TypeSourceInfo *ReturnTypeInfo = 0; 2795 QualType declSpecTy = GetDeclSpecTypeForDeclarator(state, ReturnTypeInfo); 2796 if (declSpecTy.isNull()) 2797 return Context.getNullTypeSourceInfo(); 2798 2799 if (getLangOpts().ObjCAutoRefCount) { 2800 Qualifiers::ObjCLifetime ownership = Context.getInnerObjCOwnership(FromTy); 2801 if (ownership != Qualifiers::OCL_None) 2802 transferARCOwnership(state, declSpecTy, ownership); 2803 } 2804 2805 return GetFullTypeForDeclarator(state, declSpecTy, ReturnTypeInfo); 2806} 2807 2808/// Map an AttributedType::Kind to an AttributeList::Kind. 2809static AttributeList::Kind getAttrListKind(AttributedType::Kind kind) { 2810 switch (kind) { 2811 case AttributedType::attr_address_space: 2812 return AttributeList::AT_AddressSpace; 2813 case AttributedType::attr_regparm: 2814 return AttributeList::AT_Regparm; 2815 case AttributedType::attr_vector_size: 2816 return AttributeList::AT_VectorSize; 2817 case AttributedType::attr_neon_vector_type: 2818 return AttributeList::AT_NeonVectorType; 2819 case AttributedType::attr_neon_polyvector_type: 2820 return AttributeList::AT_NeonPolyVectorType; 2821 case AttributedType::attr_objc_gc: 2822 return AttributeList::AT_ObjCGC; 2823 case AttributedType::attr_objc_ownership: 2824 return AttributeList::AT_ObjCOwnership; 2825 case AttributedType::attr_noreturn: 2826 return AttributeList::AT_NoReturn; 2827 case AttributedType::attr_cdecl: 2828 return AttributeList::AT_CDecl; 2829 case AttributedType::attr_fastcall: 2830 return AttributeList::AT_FastCall; 2831 case AttributedType::attr_stdcall: 2832 return AttributeList::AT_StdCall; 2833 case AttributedType::attr_thiscall: 2834 return AttributeList::AT_ThisCall; 2835 case AttributedType::attr_pascal: 2836 return AttributeList::AT_Pascal; 2837 case AttributedType::attr_pcs: 2838 return AttributeList::AT_Pcs; 2839 } 2840 llvm_unreachable("unexpected attribute kind!"); 2841} 2842 2843static void fillAttributedTypeLoc(AttributedTypeLoc TL, 2844 const AttributeList *attrs) { 2845 AttributedType::Kind kind = TL.getAttrKind(); 2846 2847 assert(attrs && "no type attributes in the expected location!"); 2848 AttributeList::Kind parsedKind = getAttrListKind(kind); 2849 while (attrs->getKind() != parsedKind) { 2850 attrs = attrs->getNext(); 2851 assert(attrs && "no matching attribute in expected location!"); 2852 } 2853 2854 TL.setAttrNameLoc(attrs->getLoc()); 2855 if (TL.hasAttrExprOperand()) 2856 TL.setAttrExprOperand(attrs->getArg(0)); 2857 else if (TL.hasAttrEnumOperand()) 2858 TL.setAttrEnumOperandLoc(attrs->getParameterLoc()); 2859 2860 // FIXME: preserve this information to here. 2861 if (TL.hasAttrOperand()) 2862 TL.setAttrOperandParensRange(SourceRange()); 2863} 2864 2865namespace { 2866 class TypeSpecLocFiller : public TypeLocVisitor<TypeSpecLocFiller> { 2867 ASTContext &Context; 2868 const DeclSpec &DS; 2869 2870 public: 2871 TypeSpecLocFiller(ASTContext &Context, const DeclSpec &DS) 2872 : Context(Context), DS(DS) {} 2873 2874 void VisitAttributedTypeLoc(AttributedTypeLoc TL) { 2875 fillAttributedTypeLoc(TL, DS.getAttributes().getList()); 2876 Visit(TL.getModifiedLoc()); 2877 } 2878 void VisitQualifiedTypeLoc(QualifiedTypeLoc TL) { 2879 Visit(TL.getUnqualifiedLoc()); 2880 } 2881 void VisitTypedefTypeLoc(TypedefTypeLoc TL) { 2882 TL.setNameLoc(DS.getTypeSpecTypeLoc()); 2883 } 2884 void VisitObjCInterfaceTypeLoc(ObjCInterfaceTypeLoc TL) { 2885 TL.setNameLoc(DS.getTypeSpecTypeLoc()); 2886 // FIXME. We should have DS.getTypeSpecTypeEndLoc(). But, it requires 2887 // addition field. What we have is good enough for dispay of location 2888 // of 'fixit' on interface name. 2889 TL.setNameEndLoc(DS.getLocEnd()); 2890 } 2891 void VisitObjCObjectTypeLoc(ObjCObjectTypeLoc TL) { 2892 // Handle the base type, which might not have been written explicitly. 2893 if (DS.getTypeSpecType() == DeclSpec::TST_unspecified) { 2894 TL.setHasBaseTypeAsWritten(false); 2895 TL.getBaseLoc().initialize(Context, SourceLocation()); 2896 } else { 2897 TL.setHasBaseTypeAsWritten(true); 2898 Visit(TL.getBaseLoc()); 2899 } 2900 2901 // Protocol qualifiers. 2902 if (DS.getProtocolQualifiers()) { 2903 assert(TL.getNumProtocols() > 0); 2904 assert(TL.getNumProtocols() == DS.getNumProtocolQualifiers()); 2905 TL.setLAngleLoc(DS.getProtocolLAngleLoc()); 2906 TL.setRAngleLoc(DS.getSourceRange().getEnd()); 2907 for (unsigned i = 0, e = DS.getNumProtocolQualifiers(); i != e; ++i) 2908 TL.setProtocolLoc(i, DS.getProtocolLocs()[i]); 2909 } else { 2910 assert(TL.getNumProtocols() == 0); 2911 TL.setLAngleLoc(SourceLocation()); 2912 TL.setRAngleLoc(SourceLocation()); 2913 } 2914 } 2915 void VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL) { 2916 TL.setStarLoc(SourceLocation()); 2917 Visit(TL.getPointeeLoc()); 2918 } 2919 void VisitTemplateSpecializationTypeLoc(TemplateSpecializationTypeLoc TL) { 2920 TypeSourceInfo *TInfo = 0; 2921 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 2922 2923 // If we got no declarator info from previous Sema routines, 2924 // just fill with the typespec loc. 2925 if (!TInfo) { 2926 TL.initialize(Context, DS.getTypeSpecTypeNameLoc()); 2927 return; 2928 } 2929 2930 TypeLoc OldTL = TInfo->getTypeLoc(); 2931 if (TInfo->getType()->getAs<ElaboratedType>()) { 2932 ElaboratedTypeLoc ElabTL = cast<ElaboratedTypeLoc>(OldTL); 2933 TemplateSpecializationTypeLoc NamedTL = 2934 cast<TemplateSpecializationTypeLoc>(ElabTL.getNamedTypeLoc()); 2935 TL.copy(NamedTL); 2936 } 2937 else 2938 TL.copy(cast<TemplateSpecializationTypeLoc>(OldTL)); 2939 } 2940 void VisitTypeOfExprTypeLoc(TypeOfExprTypeLoc TL) { 2941 assert(DS.getTypeSpecType() == DeclSpec::TST_typeofExpr); 2942 TL.setTypeofLoc(DS.getTypeSpecTypeLoc()); 2943 TL.setParensRange(DS.getTypeofParensRange()); 2944 } 2945 void VisitTypeOfTypeLoc(TypeOfTypeLoc TL) { 2946 assert(DS.getTypeSpecType() == DeclSpec::TST_typeofType); 2947 TL.setTypeofLoc(DS.getTypeSpecTypeLoc()); 2948 TL.setParensRange(DS.getTypeofParensRange()); 2949 assert(DS.getRepAsType()); 2950 TypeSourceInfo *TInfo = 0; 2951 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 2952 TL.setUnderlyingTInfo(TInfo); 2953 } 2954 void VisitUnaryTransformTypeLoc(UnaryTransformTypeLoc TL) { 2955 // FIXME: This holds only because we only have one unary transform. 2956 assert(DS.getTypeSpecType() == DeclSpec::TST_underlyingType); 2957 TL.setKWLoc(DS.getTypeSpecTypeLoc()); 2958 TL.setParensRange(DS.getTypeofParensRange()); 2959 assert(DS.getRepAsType()); 2960 TypeSourceInfo *TInfo = 0; 2961 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 2962 TL.setUnderlyingTInfo(TInfo); 2963 } 2964 void VisitBuiltinTypeLoc(BuiltinTypeLoc TL) { 2965 // By default, use the source location of the type specifier. 2966 TL.setBuiltinLoc(DS.getTypeSpecTypeLoc()); 2967 if (TL.needsExtraLocalData()) { 2968 // Set info for the written builtin specifiers. 2969 TL.getWrittenBuiltinSpecs() = DS.getWrittenBuiltinSpecs(); 2970 // Try to have a meaningful source location. 2971 if (TL.getWrittenSignSpec() != TSS_unspecified) 2972 // Sign spec loc overrides the others (e.g., 'unsigned long'). 2973 TL.setBuiltinLoc(DS.getTypeSpecSignLoc()); 2974 else if (TL.getWrittenWidthSpec() != TSW_unspecified) 2975 // Width spec loc overrides type spec loc (e.g., 'short int'). 2976 TL.setBuiltinLoc(DS.getTypeSpecWidthLoc()); 2977 } 2978 } 2979 void VisitElaboratedTypeLoc(ElaboratedTypeLoc TL) { 2980 ElaboratedTypeKeyword Keyword 2981 = TypeWithKeyword::getKeywordForTypeSpec(DS.getTypeSpecType()); 2982 if (DS.getTypeSpecType() == TST_typename) { 2983 TypeSourceInfo *TInfo = 0; 2984 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 2985 if (TInfo) { 2986 TL.copy(cast<ElaboratedTypeLoc>(TInfo->getTypeLoc())); 2987 return; 2988 } 2989 } 2990 TL.setElaboratedKeywordLoc(Keyword != ETK_None 2991 ? DS.getTypeSpecTypeLoc() 2992 : SourceLocation()); 2993 const CXXScopeSpec& SS = DS.getTypeSpecScope(); 2994 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 2995 Visit(TL.getNextTypeLoc().getUnqualifiedLoc()); 2996 } 2997 void VisitDependentNameTypeLoc(DependentNameTypeLoc TL) { 2998 assert(DS.getTypeSpecType() == TST_typename); 2999 TypeSourceInfo *TInfo = 0; 3000 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 3001 assert(TInfo); 3002 TL.copy(cast<DependentNameTypeLoc>(TInfo->getTypeLoc())); 3003 } 3004 void VisitDependentTemplateSpecializationTypeLoc( 3005 DependentTemplateSpecializationTypeLoc TL) { 3006 assert(DS.getTypeSpecType() == TST_typename); 3007 TypeSourceInfo *TInfo = 0; 3008 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 3009 assert(TInfo); 3010 TL.copy(cast<DependentTemplateSpecializationTypeLoc>( 3011 TInfo->getTypeLoc())); 3012 } 3013 void VisitTagTypeLoc(TagTypeLoc TL) { 3014 TL.setNameLoc(DS.getTypeSpecTypeNameLoc()); 3015 } 3016 void VisitAtomicTypeLoc(AtomicTypeLoc TL) { 3017 TL.setKWLoc(DS.getTypeSpecTypeLoc()); 3018 TL.setParensRange(DS.getTypeofParensRange()); 3019 3020 TypeSourceInfo *TInfo = 0; 3021 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 3022 TL.getValueLoc().initializeFullCopy(TInfo->getTypeLoc()); 3023 } 3024 3025 void VisitTypeLoc(TypeLoc TL) { 3026 // FIXME: add other typespec types and change this to an assert. 3027 TL.initialize(Context, DS.getTypeSpecTypeLoc()); 3028 } 3029 }; 3030 3031 class DeclaratorLocFiller : public TypeLocVisitor<DeclaratorLocFiller> { 3032 ASTContext &Context; 3033 const DeclaratorChunk &Chunk; 3034 3035 public: 3036 DeclaratorLocFiller(ASTContext &Context, const DeclaratorChunk &Chunk) 3037 : Context(Context), Chunk(Chunk) {} 3038 3039 void VisitQualifiedTypeLoc(QualifiedTypeLoc TL) { 3040 llvm_unreachable("qualified type locs not expected here!"); 3041 } 3042 3043 void VisitAttributedTypeLoc(AttributedTypeLoc TL) { 3044 fillAttributedTypeLoc(TL, Chunk.getAttrs()); 3045 } 3046 void VisitBlockPointerTypeLoc(BlockPointerTypeLoc TL) { 3047 assert(Chunk.Kind == DeclaratorChunk::BlockPointer); 3048 TL.setCaretLoc(Chunk.Loc); 3049 } 3050 void VisitPointerTypeLoc(PointerTypeLoc TL) { 3051 assert(Chunk.Kind == DeclaratorChunk::Pointer); 3052 TL.setStarLoc(Chunk.Loc); 3053 } 3054 void VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL) { 3055 assert(Chunk.Kind == DeclaratorChunk::Pointer); 3056 TL.setStarLoc(Chunk.Loc); 3057 } 3058 void VisitMemberPointerTypeLoc(MemberPointerTypeLoc TL) { 3059 assert(Chunk.Kind == DeclaratorChunk::MemberPointer); 3060 const CXXScopeSpec& SS = Chunk.Mem.Scope(); 3061 NestedNameSpecifierLoc NNSLoc = SS.getWithLocInContext(Context); 3062 3063 const Type* ClsTy = TL.getClass(); 3064 QualType ClsQT = QualType(ClsTy, 0); 3065 TypeSourceInfo *ClsTInfo = Context.CreateTypeSourceInfo(ClsQT, 0); 3066 // Now copy source location info into the type loc component. 3067 TypeLoc ClsTL = ClsTInfo->getTypeLoc(); 3068 switch (NNSLoc.getNestedNameSpecifier()->getKind()) { 3069 case NestedNameSpecifier::Identifier: 3070 assert(isa<DependentNameType>(ClsTy) && "Unexpected TypeLoc"); 3071 { 3072 DependentNameTypeLoc DNTLoc = cast<DependentNameTypeLoc>(ClsTL); 3073 DNTLoc.setElaboratedKeywordLoc(SourceLocation()); 3074 DNTLoc.setQualifierLoc(NNSLoc.getPrefix()); 3075 DNTLoc.setNameLoc(NNSLoc.getLocalBeginLoc()); 3076 } 3077 break; 3078 3079 case NestedNameSpecifier::TypeSpec: 3080 case NestedNameSpecifier::TypeSpecWithTemplate: 3081 if (isa<ElaboratedType>(ClsTy)) { 3082 ElaboratedTypeLoc ETLoc = *cast<ElaboratedTypeLoc>(&ClsTL); 3083 ETLoc.setElaboratedKeywordLoc(SourceLocation()); 3084 ETLoc.setQualifierLoc(NNSLoc.getPrefix()); 3085 TypeLoc NamedTL = ETLoc.getNamedTypeLoc(); 3086 NamedTL.initializeFullCopy(NNSLoc.getTypeLoc()); 3087 } else { 3088 ClsTL.initializeFullCopy(NNSLoc.getTypeLoc()); 3089 } 3090 break; 3091 3092 case NestedNameSpecifier::Namespace: 3093 case NestedNameSpecifier::NamespaceAlias: 3094 case NestedNameSpecifier::Global: 3095 llvm_unreachable("Nested-name-specifier must name a type"); 3096 } 3097 3098 // Finally fill in MemberPointerLocInfo fields. 3099 TL.setStarLoc(Chunk.Loc); 3100 TL.setClassTInfo(ClsTInfo); 3101 } 3102 void VisitLValueReferenceTypeLoc(LValueReferenceTypeLoc TL) { 3103 assert(Chunk.Kind == DeclaratorChunk::Reference); 3104 // 'Amp' is misleading: this might have been originally 3105 /// spelled with AmpAmp. 3106 TL.setAmpLoc(Chunk.Loc); 3107 } 3108 void VisitRValueReferenceTypeLoc(RValueReferenceTypeLoc TL) { 3109 assert(Chunk.Kind == DeclaratorChunk::Reference); 3110 assert(!Chunk.Ref.LValueRef); 3111 TL.setAmpAmpLoc(Chunk.Loc); 3112 } 3113 void VisitArrayTypeLoc(ArrayTypeLoc TL) { 3114 assert(Chunk.Kind == DeclaratorChunk::Array); 3115 TL.setLBracketLoc(Chunk.Loc); 3116 TL.setRBracketLoc(Chunk.EndLoc); 3117 TL.setSizeExpr(static_cast<Expr*>(Chunk.Arr.NumElts)); 3118 } 3119 void VisitFunctionTypeLoc(FunctionTypeLoc TL) { 3120 assert(Chunk.Kind == DeclaratorChunk::Function); 3121 TL.setLocalRangeBegin(Chunk.Loc); 3122 TL.setLocalRangeEnd(Chunk.EndLoc); 3123 TL.setTrailingReturn(Chunk.Fun.hasTrailingReturnType()); 3124 3125 const DeclaratorChunk::FunctionTypeInfo &FTI = Chunk.Fun; 3126 for (unsigned i = 0, e = TL.getNumArgs(), tpi = 0; i != e; ++i) { 3127 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 3128 TL.setArg(tpi++, Param); 3129 } 3130 // FIXME: exception specs 3131 } 3132 void VisitParenTypeLoc(ParenTypeLoc TL) { 3133 assert(Chunk.Kind == DeclaratorChunk::Paren); 3134 TL.setLParenLoc(Chunk.Loc); 3135 TL.setRParenLoc(Chunk.EndLoc); 3136 } 3137 3138 void VisitTypeLoc(TypeLoc TL) { 3139 llvm_unreachable("unsupported TypeLoc kind in declarator!"); 3140 } 3141 }; 3142} 3143 3144/// \brief Create and instantiate a TypeSourceInfo with type source information. 3145/// 3146/// \param T QualType referring to the type as written in source code. 3147/// 3148/// \param ReturnTypeInfo For declarators whose return type does not show 3149/// up in the normal place in the declaration specifiers (such as a C++ 3150/// conversion function), this pointer will refer to a type source information 3151/// for that return type. 3152TypeSourceInfo * 3153Sema::GetTypeSourceInfoForDeclarator(Declarator &D, QualType T, 3154 TypeSourceInfo *ReturnTypeInfo) { 3155 TypeSourceInfo *TInfo = Context.CreateTypeSourceInfo(T); 3156 UnqualTypeLoc CurrTL = TInfo->getTypeLoc().getUnqualifiedLoc(); 3157 3158 // Handle parameter packs whose type is a pack expansion. 3159 if (isa<PackExpansionType>(T)) { 3160 cast<PackExpansionTypeLoc>(CurrTL).setEllipsisLoc(D.getEllipsisLoc()); 3161 CurrTL = CurrTL.getNextTypeLoc().getUnqualifiedLoc(); 3162 } 3163 3164 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 3165 while (isa<AttributedTypeLoc>(CurrTL)) { 3166 AttributedTypeLoc TL = cast<AttributedTypeLoc>(CurrTL); 3167 fillAttributedTypeLoc(TL, D.getTypeObject(i).getAttrs()); 3168 CurrTL = TL.getNextTypeLoc().getUnqualifiedLoc(); 3169 } 3170 3171 DeclaratorLocFiller(Context, D.getTypeObject(i)).Visit(CurrTL); 3172 CurrTL = CurrTL.getNextTypeLoc().getUnqualifiedLoc(); 3173 } 3174 3175 // If we have different source information for the return type, use 3176 // that. This really only applies to C++ conversion functions. 3177 if (ReturnTypeInfo) { 3178 TypeLoc TL = ReturnTypeInfo->getTypeLoc(); 3179 assert(TL.getFullDataSize() == CurrTL.getFullDataSize()); 3180 memcpy(CurrTL.getOpaqueData(), TL.getOpaqueData(), TL.getFullDataSize()); 3181 } else { 3182 TypeSpecLocFiller(Context, D.getDeclSpec()).Visit(CurrTL); 3183 } 3184 3185 return TInfo; 3186} 3187 3188/// \brief Create a LocInfoType to hold the given QualType and TypeSourceInfo. 3189ParsedType Sema::CreateParsedType(QualType T, TypeSourceInfo *TInfo) { 3190 // FIXME: LocInfoTypes are "transient", only needed for passing to/from Parser 3191 // and Sema during declaration parsing. Try deallocating/caching them when 3192 // it's appropriate, instead of allocating them and keeping them around. 3193 LocInfoType *LocT = (LocInfoType*)BumpAlloc.Allocate(sizeof(LocInfoType), 3194 TypeAlignment); 3195 new (LocT) LocInfoType(T, TInfo); 3196 assert(LocT->getTypeClass() != T->getTypeClass() && 3197 "LocInfoType's TypeClass conflicts with an existing Type class"); 3198 return ParsedType::make(QualType(LocT, 0)); 3199} 3200 3201void LocInfoType::getAsStringInternal(std::string &Str, 3202 const PrintingPolicy &Policy) const { 3203 llvm_unreachable("LocInfoType leaked into the type system; an opaque TypeTy*" 3204 " was used directly instead of getting the QualType through" 3205 " GetTypeFromParser"); 3206} 3207 3208TypeResult Sema::ActOnTypeName(Scope *S, Declarator &D) { 3209 // C99 6.7.6: Type names have no identifier. This is already validated by 3210 // the parser. 3211 assert(D.getIdentifier() == 0 && "Type name should have no identifier!"); 3212 3213 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 3214 QualType T = TInfo->getType(); 3215 if (D.isInvalidType()) 3216 return true; 3217 3218 // Make sure there are no unused decl attributes on the declarator. 3219 // We don't want to do this for ObjC parameters because we're going 3220 // to apply them to the actual parameter declaration. 3221 if (D.getContext() != Declarator::ObjCParameterContext) 3222 checkUnusedDeclAttributes(D); 3223 3224 if (getLangOpts().CPlusPlus) { 3225 // Check that there are no default arguments (C++ only). 3226 CheckExtraCXXDefaultArguments(D); 3227 } 3228 3229 return CreateParsedType(T, TInfo); 3230} 3231 3232ParsedType Sema::ActOnObjCInstanceType(SourceLocation Loc) { 3233 QualType T = Context.getObjCInstanceType(); 3234 TypeSourceInfo *TInfo = Context.getTrivialTypeSourceInfo(T, Loc); 3235 return CreateParsedType(T, TInfo); 3236} 3237 3238 3239//===----------------------------------------------------------------------===// 3240// Type Attribute Processing 3241//===----------------------------------------------------------------------===// 3242 3243/// HandleAddressSpaceTypeAttribute - Process an address_space attribute on the 3244/// specified type. The attribute contains 1 argument, the id of the address 3245/// space for the type. 3246static void HandleAddressSpaceTypeAttribute(QualType &Type, 3247 const AttributeList &Attr, Sema &S){ 3248 3249 // If this type is already address space qualified, reject it. 3250 // ISO/IEC TR 18037 S5.3 (amending C99 6.7.3): "No type shall be qualified by 3251 // qualifiers for two or more different address spaces." 3252 if (Type.getAddressSpace()) { 3253 S.Diag(Attr.getLoc(), diag::err_attribute_address_multiple_qualifiers); 3254 Attr.setInvalid(); 3255 return; 3256 } 3257 3258 // ISO/IEC TR 18037 S5.3 (amending C99 6.7.3): "A function type shall not be 3259 // qualified by an address-space qualifier." 3260 if (Type->isFunctionType()) { 3261 S.Diag(Attr.getLoc(), diag::err_attribute_address_function_type); 3262 Attr.setInvalid(); 3263 return; 3264 } 3265 3266 // Check the attribute arguments. 3267 if (Attr.getNumArgs() != 1) { 3268 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 3269 Attr.setInvalid(); 3270 return; 3271 } 3272 Expr *ASArgExpr = static_cast<Expr *>(Attr.getArg(0)); 3273 llvm::APSInt addrSpace(32); 3274 if (ASArgExpr->isTypeDependent() || ASArgExpr->isValueDependent() || 3275 !ASArgExpr->isIntegerConstantExpr(addrSpace, S.Context)) { 3276 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_not_int) 3277 << ASArgExpr->getSourceRange(); 3278 Attr.setInvalid(); 3279 return; 3280 } 3281 3282 // Bounds checking. 3283 if (addrSpace.isSigned()) { 3284 if (addrSpace.isNegative()) { 3285 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_negative) 3286 << ASArgExpr->getSourceRange(); 3287 Attr.setInvalid(); 3288 return; 3289 } 3290 addrSpace.setIsSigned(false); 3291 } 3292 llvm::APSInt max(addrSpace.getBitWidth()); 3293 max = Qualifiers::MaxAddressSpace; 3294 if (addrSpace > max) { 3295 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_too_high) 3296 << Qualifiers::MaxAddressSpace << ASArgExpr->getSourceRange(); 3297 Attr.setInvalid(); 3298 return; 3299 } 3300 3301 unsigned ASIdx = static_cast<unsigned>(addrSpace.getZExtValue()); 3302 Type = S.Context.getAddrSpaceQualType(Type, ASIdx); 3303} 3304 3305/// Does this type have a "direct" ownership qualifier? That is, 3306/// is it written like "__strong id", as opposed to something like 3307/// "typeof(foo)", where that happens to be strong? 3308static bool hasDirectOwnershipQualifier(QualType type) { 3309 // Fast path: no qualifier at all. 3310 assert(type.getQualifiers().hasObjCLifetime()); 3311 3312 while (true) { 3313 // __strong id 3314 if (const AttributedType *attr = dyn_cast<AttributedType>(type)) { 3315 if (attr->getAttrKind() == AttributedType::attr_objc_ownership) 3316 return true; 3317 3318 type = attr->getModifiedType(); 3319 3320 // X *__strong (...) 3321 } else if (const ParenType *paren = dyn_cast<ParenType>(type)) { 3322 type = paren->getInnerType(); 3323 3324 // That's it for things we want to complain about. In particular, 3325 // we do not want to look through typedefs, typeof(expr), 3326 // typeof(type), or any other way that the type is somehow 3327 // abstracted. 3328 } else { 3329 3330 return false; 3331 } 3332 } 3333} 3334 3335/// handleObjCOwnershipTypeAttr - Process an objc_ownership 3336/// attribute on the specified type. 3337/// 3338/// Returns 'true' if the attribute was handled. 3339static bool handleObjCOwnershipTypeAttr(TypeProcessingState &state, 3340 AttributeList &attr, 3341 QualType &type) { 3342 bool NonObjCPointer = false; 3343 3344 if (!type->isDependentType()) { 3345 if (const PointerType *ptr = type->getAs<PointerType>()) { 3346 QualType pointee = ptr->getPointeeType(); 3347 if (pointee->isObjCRetainableType() || pointee->isPointerType()) 3348 return false; 3349 // It is important not to lose the source info that there was an attribute 3350 // applied to non-objc pointer. We will create an attributed type but 3351 // its type will be the same as the original type. 3352 NonObjCPointer = true; 3353 } else if (!type->isObjCRetainableType()) { 3354 return false; 3355 } 3356 } 3357 3358 Sema &S = state.getSema(); 3359 SourceLocation AttrLoc = attr.getLoc(); 3360 if (AttrLoc.isMacroID()) 3361 AttrLoc = S.getSourceManager().getImmediateExpansionRange(AttrLoc).first; 3362 3363 if (!attr.getParameterName()) { 3364 S.Diag(AttrLoc, diag::err_attribute_argument_n_not_string) 3365 << "objc_ownership" << 1; 3366 attr.setInvalid(); 3367 return true; 3368 } 3369 3370 // Consume lifetime attributes without further comment outside of 3371 // ARC mode. 3372 if (!S.getLangOpts().ObjCAutoRefCount) 3373 return true; 3374 3375 Qualifiers::ObjCLifetime lifetime; 3376 if (attr.getParameterName()->isStr("none")) 3377 lifetime = Qualifiers::OCL_ExplicitNone; 3378 else if (attr.getParameterName()->isStr("strong")) 3379 lifetime = Qualifiers::OCL_Strong; 3380 else if (attr.getParameterName()->isStr("weak")) 3381 lifetime = Qualifiers::OCL_Weak; 3382 else if (attr.getParameterName()->isStr("autoreleasing")) 3383 lifetime = Qualifiers::OCL_Autoreleasing; 3384 else { 3385 S.Diag(AttrLoc, diag::warn_attribute_type_not_supported) 3386 << "objc_ownership" << attr.getParameterName(); 3387 attr.setInvalid(); 3388 return true; 3389 } 3390 3391 SplitQualType underlyingType = type.split(); 3392 3393 // Check for redundant/conflicting ownership qualifiers. 3394 if (Qualifiers::ObjCLifetime previousLifetime 3395 = type.getQualifiers().getObjCLifetime()) { 3396 // If it's written directly, that's an error. 3397 if (hasDirectOwnershipQualifier(type)) { 3398 S.Diag(AttrLoc, diag::err_attr_objc_ownership_redundant) 3399 << type; 3400 return true; 3401 } 3402 3403 // Otherwise, if the qualifiers actually conflict, pull sugar off 3404 // until we reach a type that is directly qualified. 3405 if (previousLifetime != lifetime) { 3406 // This should always terminate: the canonical type is 3407 // qualified, so some bit of sugar must be hiding it. 3408 while (!underlyingType.Quals.hasObjCLifetime()) { 3409 underlyingType = underlyingType.getSingleStepDesugaredType(); 3410 } 3411 underlyingType.Quals.removeObjCLifetime(); 3412 } 3413 } 3414 3415 underlyingType.Quals.addObjCLifetime(lifetime); 3416 3417 if (NonObjCPointer) { 3418 StringRef name = attr.getName()->getName(); 3419 switch (lifetime) { 3420 case Qualifiers::OCL_None: 3421 case Qualifiers::OCL_ExplicitNone: 3422 break; 3423 case Qualifiers::OCL_Strong: name = "__strong"; break; 3424 case Qualifiers::OCL_Weak: name = "__weak"; break; 3425 case Qualifiers::OCL_Autoreleasing: name = "__autoreleasing"; break; 3426 } 3427 S.Diag(AttrLoc, diag::warn_objc_object_attribute_wrong_type) 3428 << name << type; 3429 } 3430 3431 QualType origType = type; 3432 if (!NonObjCPointer) 3433 type = S.Context.getQualifiedType(underlyingType); 3434 3435 // If we have a valid source location for the attribute, use an 3436 // AttributedType instead. 3437 if (AttrLoc.isValid()) 3438 type = S.Context.getAttributedType(AttributedType::attr_objc_ownership, 3439 origType, type); 3440 3441 // Forbid __weak if the runtime doesn't support it. 3442 if (lifetime == Qualifiers::OCL_Weak && 3443 !S.getLangOpts().ObjCRuntimeHasWeak && !NonObjCPointer) { 3444 3445 // Actually, delay this until we know what we're parsing. 3446 if (S.DelayedDiagnostics.shouldDelayDiagnostics()) { 3447 S.DelayedDiagnostics.add( 3448 sema::DelayedDiagnostic::makeForbiddenType( 3449 S.getSourceManager().getExpansionLoc(AttrLoc), 3450 diag::err_arc_weak_no_runtime, type, /*ignored*/ 0)); 3451 } else { 3452 S.Diag(AttrLoc, diag::err_arc_weak_no_runtime); 3453 } 3454 3455 attr.setInvalid(); 3456 return true; 3457 } 3458 3459 // Forbid __weak for class objects marked as 3460 // objc_arc_weak_reference_unavailable 3461 if (lifetime == Qualifiers::OCL_Weak) { 3462 QualType T = type; 3463 while (const PointerType *ptr = T->getAs<PointerType>()) 3464 T = ptr->getPointeeType(); 3465 if (const ObjCObjectPointerType *ObjT = T->getAs<ObjCObjectPointerType>()) { 3466 ObjCInterfaceDecl *Class = ObjT->getInterfaceDecl(); 3467 if (Class->isArcWeakrefUnavailable()) { 3468 S.Diag(AttrLoc, diag::err_arc_unsupported_weak_class); 3469 S.Diag(ObjT->getInterfaceDecl()->getLocation(), 3470 diag::note_class_declared); 3471 } 3472 } 3473 } 3474 3475 return true; 3476} 3477 3478/// handleObjCGCTypeAttr - Process the __attribute__((objc_gc)) type 3479/// attribute on the specified type. Returns true to indicate that 3480/// the attribute was handled, false to indicate that the type does 3481/// not permit the attribute. 3482static bool handleObjCGCTypeAttr(TypeProcessingState &state, 3483 AttributeList &attr, 3484 QualType &type) { 3485 Sema &S = state.getSema(); 3486 3487 // Delay if this isn't some kind of pointer. 3488 if (!type->isPointerType() && 3489 !type->isObjCObjectPointerType() && 3490 !type->isBlockPointerType()) 3491 return false; 3492 3493 if (type.getObjCGCAttr() != Qualifiers::GCNone) { 3494 S.Diag(attr.getLoc(), diag::err_attribute_multiple_objc_gc); 3495 attr.setInvalid(); 3496 return true; 3497 } 3498 3499 // Check the attribute arguments. 3500 if (!attr.getParameterName()) { 3501 S.Diag(attr.getLoc(), diag::err_attribute_argument_n_not_string) 3502 << "objc_gc" << 1; 3503 attr.setInvalid(); 3504 return true; 3505 } 3506 Qualifiers::GC GCAttr; 3507 if (attr.getNumArgs() != 0) { 3508 S.Diag(attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 3509 attr.setInvalid(); 3510 return true; 3511 } 3512 if (attr.getParameterName()->isStr("weak")) 3513 GCAttr = Qualifiers::Weak; 3514 else if (attr.getParameterName()->isStr("strong")) 3515 GCAttr = Qualifiers::Strong; 3516 else { 3517 S.Diag(attr.getLoc(), diag::warn_attribute_type_not_supported) 3518 << "objc_gc" << attr.getParameterName(); 3519 attr.setInvalid(); 3520 return true; 3521 } 3522 3523 QualType origType = type; 3524 type = S.Context.getObjCGCQualType(origType, GCAttr); 3525 3526 // Make an attributed type to preserve the source information. 3527 if (attr.getLoc().isValid()) 3528 type = S.Context.getAttributedType(AttributedType::attr_objc_gc, 3529 origType, type); 3530 3531 return true; 3532} 3533 3534namespace { 3535 /// A helper class to unwrap a type down to a function for the 3536 /// purposes of applying attributes there. 3537 /// 3538 /// Use: 3539 /// FunctionTypeUnwrapper unwrapped(SemaRef, T); 3540 /// if (unwrapped.isFunctionType()) { 3541 /// const FunctionType *fn = unwrapped.get(); 3542 /// // change fn somehow 3543 /// T = unwrapped.wrap(fn); 3544 /// } 3545 struct FunctionTypeUnwrapper { 3546 enum WrapKind { 3547 Desugar, 3548 Parens, 3549 Pointer, 3550 BlockPointer, 3551 Reference, 3552 MemberPointer 3553 }; 3554 3555 QualType Original; 3556 const FunctionType *Fn; 3557 SmallVector<unsigned char /*WrapKind*/, 8> Stack; 3558 3559 FunctionTypeUnwrapper(Sema &S, QualType T) : Original(T) { 3560 while (true) { 3561 const Type *Ty = T.getTypePtr(); 3562 if (isa<FunctionType>(Ty)) { 3563 Fn = cast<FunctionType>(Ty); 3564 return; 3565 } else if (isa<ParenType>(Ty)) { 3566 T = cast<ParenType>(Ty)->getInnerType(); 3567 Stack.push_back(Parens); 3568 } else if (isa<PointerType>(Ty)) { 3569 T = cast<PointerType>(Ty)->getPointeeType(); 3570 Stack.push_back(Pointer); 3571 } else if (isa<BlockPointerType>(Ty)) { 3572 T = cast<BlockPointerType>(Ty)->getPointeeType(); 3573 Stack.push_back(BlockPointer); 3574 } else if (isa<MemberPointerType>(Ty)) { 3575 T = cast<MemberPointerType>(Ty)->getPointeeType(); 3576 Stack.push_back(MemberPointer); 3577 } else if (isa<ReferenceType>(Ty)) { 3578 T = cast<ReferenceType>(Ty)->getPointeeType(); 3579 Stack.push_back(Reference); 3580 } else { 3581 const Type *DTy = Ty->getUnqualifiedDesugaredType(); 3582 if (Ty == DTy) { 3583 Fn = 0; 3584 return; 3585 } 3586 3587 T = QualType(DTy, 0); 3588 Stack.push_back(Desugar); 3589 } 3590 } 3591 } 3592 3593 bool isFunctionType() const { return (Fn != 0); } 3594 const FunctionType *get() const { return Fn; } 3595 3596 QualType wrap(Sema &S, const FunctionType *New) { 3597 // If T wasn't modified from the unwrapped type, do nothing. 3598 if (New == get()) return Original; 3599 3600 Fn = New; 3601 return wrap(S.Context, Original, 0); 3602 } 3603 3604 private: 3605 QualType wrap(ASTContext &C, QualType Old, unsigned I) { 3606 if (I == Stack.size()) 3607 return C.getQualifiedType(Fn, Old.getQualifiers()); 3608 3609 // Build up the inner type, applying the qualifiers from the old 3610 // type to the new type. 3611 SplitQualType SplitOld = Old.split(); 3612 3613 // As a special case, tail-recurse if there are no qualifiers. 3614 if (SplitOld.Quals.empty()) 3615 return wrap(C, SplitOld.Ty, I); 3616 return C.getQualifiedType(wrap(C, SplitOld.Ty, I), SplitOld.Quals); 3617 } 3618 3619 QualType wrap(ASTContext &C, const Type *Old, unsigned I) { 3620 if (I == Stack.size()) return QualType(Fn, 0); 3621 3622 switch (static_cast<WrapKind>(Stack[I++])) { 3623 case Desugar: 3624 // This is the point at which we potentially lose source 3625 // information. 3626 return wrap(C, Old->getUnqualifiedDesugaredType(), I); 3627 3628 case Parens: { 3629 QualType New = wrap(C, cast<ParenType>(Old)->getInnerType(), I); 3630 return C.getParenType(New); 3631 } 3632 3633 case Pointer: { 3634 QualType New = wrap(C, cast<PointerType>(Old)->getPointeeType(), I); 3635 return C.getPointerType(New); 3636 } 3637 3638 case BlockPointer: { 3639 QualType New = wrap(C, cast<BlockPointerType>(Old)->getPointeeType(),I); 3640 return C.getBlockPointerType(New); 3641 } 3642 3643 case MemberPointer: { 3644 const MemberPointerType *OldMPT = cast<MemberPointerType>(Old); 3645 QualType New = wrap(C, OldMPT->getPointeeType(), I); 3646 return C.getMemberPointerType(New, OldMPT->getClass()); 3647 } 3648 3649 case Reference: { 3650 const ReferenceType *OldRef = cast<ReferenceType>(Old); 3651 QualType New = wrap(C, OldRef->getPointeeType(), I); 3652 if (isa<LValueReferenceType>(OldRef)) 3653 return C.getLValueReferenceType(New, OldRef->isSpelledAsLValue()); 3654 else 3655 return C.getRValueReferenceType(New); 3656 } 3657 } 3658 3659 llvm_unreachable("unknown wrapping kind"); 3660 } 3661 }; 3662} 3663 3664/// Process an individual function attribute. Returns true to 3665/// indicate that the attribute was handled, false if it wasn't. 3666static bool handleFunctionTypeAttr(TypeProcessingState &state, 3667 AttributeList &attr, 3668 QualType &type) { 3669 Sema &S = state.getSema(); 3670 3671 FunctionTypeUnwrapper unwrapped(S, type); 3672 3673 if (attr.getKind() == AttributeList::AT_NoReturn) { 3674 if (S.CheckNoReturnAttr(attr)) 3675 return true; 3676 3677 // Delay if this is not a function type. 3678 if (!unwrapped.isFunctionType()) 3679 return false; 3680 3681 // Otherwise we can process right away. 3682 FunctionType::ExtInfo EI = unwrapped.get()->getExtInfo().withNoReturn(true); 3683 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 3684 return true; 3685 } 3686 3687 // ns_returns_retained is not always a type attribute, but if we got 3688 // here, we're treating it as one right now. 3689 if (attr.getKind() == AttributeList::AT_NSReturnsRetained) { 3690 assert(S.getLangOpts().ObjCAutoRefCount && 3691 "ns_returns_retained treated as type attribute in non-ARC"); 3692 if (attr.getNumArgs()) return true; 3693 3694 // Delay if this is not a function type. 3695 if (!unwrapped.isFunctionType()) 3696 return false; 3697 3698 FunctionType::ExtInfo EI 3699 = unwrapped.get()->getExtInfo().withProducesResult(true); 3700 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 3701 return true; 3702 } 3703 3704 if (attr.getKind() == AttributeList::AT_Regparm) { 3705 unsigned value; 3706 if (S.CheckRegparmAttr(attr, value)) 3707 return true; 3708 3709 // Delay if this is not a function type. 3710 if (!unwrapped.isFunctionType()) 3711 return false; 3712 3713 // Diagnose regparm with fastcall. 3714 const FunctionType *fn = unwrapped.get(); 3715 CallingConv CC = fn->getCallConv(); 3716 if (CC == CC_X86FastCall) { 3717 S.Diag(attr.getLoc(), diag::err_attributes_are_not_compatible) 3718 << FunctionType::getNameForCallConv(CC) 3719 << "regparm"; 3720 attr.setInvalid(); 3721 return true; 3722 } 3723 3724 FunctionType::ExtInfo EI = 3725 unwrapped.get()->getExtInfo().withRegParm(value); 3726 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 3727 return true; 3728 } 3729 3730 // Otherwise, a calling convention. 3731 CallingConv CC; 3732 if (S.CheckCallingConvAttr(attr, CC)) 3733 return true; 3734 3735 // Delay if the type didn't work out to a function. 3736 if (!unwrapped.isFunctionType()) return false; 3737 3738 const FunctionType *fn = unwrapped.get(); 3739 CallingConv CCOld = fn->getCallConv(); 3740 if (S.Context.getCanonicalCallConv(CC) == 3741 S.Context.getCanonicalCallConv(CCOld)) { 3742 FunctionType::ExtInfo EI= unwrapped.get()->getExtInfo().withCallingConv(CC); 3743 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 3744 return true; 3745 } 3746 3747 if (CCOld != (S.LangOpts.MRTD ? CC_X86StdCall : CC_Default)) { 3748 // Should we diagnose reapplications of the same convention? 3749 S.Diag(attr.getLoc(), diag::err_attributes_are_not_compatible) 3750 << FunctionType::getNameForCallConv(CC) 3751 << FunctionType::getNameForCallConv(CCOld); 3752 attr.setInvalid(); 3753 return true; 3754 } 3755 3756 // Diagnose the use of X86 fastcall on varargs or unprototyped functions. 3757 if (CC == CC_X86FastCall) { 3758 if (isa<FunctionNoProtoType>(fn)) { 3759 S.Diag(attr.getLoc(), diag::err_cconv_knr) 3760 << FunctionType::getNameForCallConv(CC); 3761 attr.setInvalid(); 3762 return true; 3763 } 3764 3765 const FunctionProtoType *FnP = cast<FunctionProtoType>(fn); 3766 if (FnP->isVariadic()) { 3767 S.Diag(attr.getLoc(), diag::err_cconv_varargs) 3768 << FunctionType::getNameForCallConv(CC); 3769 attr.setInvalid(); 3770 return true; 3771 } 3772 3773 // Also diagnose fastcall with regparm. 3774 if (fn->getHasRegParm()) { 3775 S.Diag(attr.getLoc(), diag::err_attributes_are_not_compatible) 3776 << "regparm" 3777 << FunctionType::getNameForCallConv(CC); 3778 attr.setInvalid(); 3779 return true; 3780 } 3781 } 3782 3783 FunctionType::ExtInfo EI = unwrapped.get()->getExtInfo().withCallingConv(CC); 3784 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 3785 return true; 3786} 3787 3788/// Handle OpenCL image access qualifiers: read_only, write_only, read_write 3789static void HandleOpenCLImageAccessAttribute(QualType& CurType, 3790 const AttributeList &Attr, 3791 Sema &S) { 3792 // Check the attribute arguments. 3793 if (Attr.getNumArgs() != 1) { 3794 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 3795 Attr.setInvalid(); 3796 return; 3797 } 3798 Expr *sizeExpr = static_cast<Expr *>(Attr.getArg(0)); 3799 llvm::APSInt arg(32); 3800 if (sizeExpr->isTypeDependent() || sizeExpr->isValueDependent() || 3801 !sizeExpr->isIntegerConstantExpr(arg, S.Context)) { 3802 S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int) 3803 << "opencl_image_access" << sizeExpr->getSourceRange(); 3804 Attr.setInvalid(); 3805 return; 3806 } 3807 unsigned iarg = static_cast<unsigned>(arg.getZExtValue()); 3808 switch (iarg) { 3809 case CLIA_read_only: 3810 case CLIA_write_only: 3811 case CLIA_read_write: 3812 // Implemented in a separate patch 3813 break; 3814 default: 3815 // Implemented in a separate patch 3816 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_size) 3817 << sizeExpr->getSourceRange(); 3818 Attr.setInvalid(); 3819 break; 3820 } 3821} 3822 3823/// HandleVectorSizeAttribute - this attribute is only applicable to integral 3824/// and float scalars, although arrays, pointers, and function return values are 3825/// allowed in conjunction with this construct. Aggregates with this attribute 3826/// are invalid, even if they are of the same size as a corresponding scalar. 3827/// The raw attribute should contain precisely 1 argument, the vector size for 3828/// the variable, measured in bytes. If curType and rawAttr are well formed, 3829/// this routine will return a new vector type. 3830static void HandleVectorSizeAttr(QualType& CurType, const AttributeList &Attr, 3831 Sema &S) { 3832 // Check the attribute arguments. 3833 if (Attr.getNumArgs() != 1) { 3834 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 3835 Attr.setInvalid(); 3836 return; 3837 } 3838 Expr *sizeExpr = static_cast<Expr *>(Attr.getArg(0)); 3839 llvm::APSInt vecSize(32); 3840 if (sizeExpr->isTypeDependent() || sizeExpr->isValueDependent() || 3841 !sizeExpr->isIntegerConstantExpr(vecSize, S.Context)) { 3842 S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int) 3843 << "vector_size" << sizeExpr->getSourceRange(); 3844 Attr.setInvalid(); 3845 return; 3846 } 3847 // the base type must be integer or float, and can't already be a vector. 3848 if (!CurType->isIntegerType() && !CurType->isRealFloatingType()) { 3849 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_vector_type) << CurType; 3850 Attr.setInvalid(); 3851 return; 3852 } 3853 unsigned typeSize = static_cast<unsigned>(S.Context.getTypeSize(CurType)); 3854 // vecSize is specified in bytes - convert to bits. 3855 unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue() * 8); 3856 3857 // the vector size needs to be an integral multiple of the type size. 3858 if (vectorSize % typeSize) { 3859 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_size) 3860 << sizeExpr->getSourceRange(); 3861 Attr.setInvalid(); 3862 return; 3863 } 3864 if (vectorSize == 0) { 3865 S.Diag(Attr.getLoc(), diag::err_attribute_zero_size) 3866 << sizeExpr->getSourceRange(); 3867 Attr.setInvalid(); 3868 return; 3869 } 3870 3871 // Success! Instantiate the vector type, the number of elements is > 0, and 3872 // not required to be a power of 2, unlike GCC. 3873 CurType = S.Context.getVectorType(CurType, vectorSize/typeSize, 3874 VectorType::GenericVector); 3875} 3876 3877/// \brief Process the OpenCL-like ext_vector_type attribute when it occurs on 3878/// a type. 3879static void HandleExtVectorTypeAttr(QualType &CurType, 3880 const AttributeList &Attr, 3881 Sema &S) { 3882 Expr *sizeExpr; 3883 3884 // Special case where the argument is a template id. 3885 if (Attr.getParameterName()) { 3886 CXXScopeSpec SS; 3887 SourceLocation TemplateKWLoc; 3888 UnqualifiedId id; 3889 id.setIdentifier(Attr.getParameterName(), Attr.getLoc()); 3890 3891 ExprResult Size = S.ActOnIdExpression(S.getCurScope(), SS, TemplateKWLoc, 3892 id, false, false); 3893 if (Size.isInvalid()) 3894 return; 3895 3896 sizeExpr = Size.get(); 3897 } else { 3898 // check the attribute arguments. 3899 if (Attr.getNumArgs() != 1) { 3900 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 3901 return; 3902 } 3903 sizeExpr = Attr.getArg(0); 3904 } 3905 3906 // Create the vector type. 3907 QualType T = S.BuildExtVectorType(CurType, sizeExpr, Attr.getLoc()); 3908 if (!T.isNull()) 3909 CurType = T; 3910} 3911 3912/// HandleNeonVectorTypeAttr - The "neon_vector_type" and 3913/// "neon_polyvector_type" attributes are used to create vector types that 3914/// are mangled according to ARM's ABI. Otherwise, these types are identical 3915/// to those created with the "vector_size" attribute. Unlike "vector_size" 3916/// the argument to these Neon attributes is the number of vector elements, 3917/// not the vector size in bytes. The vector width and element type must 3918/// match one of the standard Neon vector types. 3919static void HandleNeonVectorTypeAttr(QualType& CurType, 3920 const AttributeList &Attr, Sema &S, 3921 VectorType::VectorKind VecKind, 3922 const char *AttrName) { 3923 // Check the attribute arguments. 3924 if (Attr.getNumArgs() != 1) { 3925 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 3926 Attr.setInvalid(); 3927 return; 3928 } 3929 // The number of elements must be an ICE. 3930 Expr *numEltsExpr = static_cast<Expr *>(Attr.getArg(0)); 3931 llvm::APSInt numEltsInt(32); 3932 if (numEltsExpr->isTypeDependent() || numEltsExpr->isValueDependent() || 3933 !numEltsExpr->isIntegerConstantExpr(numEltsInt, S.Context)) { 3934 S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int) 3935 << AttrName << numEltsExpr->getSourceRange(); 3936 Attr.setInvalid(); 3937 return; 3938 } 3939 // Only certain element types are supported for Neon vectors. 3940 const BuiltinType* BTy = CurType->getAs<BuiltinType>(); 3941 if (!BTy || 3942 (VecKind == VectorType::NeonPolyVector && 3943 BTy->getKind() != BuiltinType::SChar && 3944 BTy->getKind() != BuiltinType::Short) || 3945 (BTy->getKind() != BuiltinType::SChar && 3946 BTy->getKind() != BuiltinType::UChar && 3947 BTy->getKind() != BuiltinType::Short && 3948 BTy->getKind() != BuiltinType::UShort && 3949 BTy->getKind() != BuiltinType::Int && 3950 BTy->getKind() != BuiltinType::UInt && 3951 BTy->getKind() != BuiltinType::LongLong && 3952 BTy->getKind() != BuiltinType::ULongLong && 3953 BTy->getKind() != BuiltinType::Float)) { 3954 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_vector_type) <<CurType; 3955 Attr.setInvalid(); 3956 return; 3957 } 3958 // The total size of the vector must be 64 or 128 bits. 3959 unsigned typeSize = static_cast<unsigned>(S.Context.getTypeSize(CurType)); 3960 unsigned numElts = static_cast<unsigned>(numEltsInt.getZExtValue()); 3961 unsigned vecSize = typeSize * numElts; 3962 if (vecSize != 64 && vecSize != 128) { 3963 S.Diag(Attr.getLoc(), diag::err_attribute_bad_neon_vector_size) << CurType; 3964 Attr.setInvalid(); 3965 return; 3966 } 3967 3968 CurType = S.Context.getVectorType(CurType, numElts, VecKind); 3969} 3970 3971static void processTypeAttrs(TypeProcessingState &state, QualType &type, 3972 bool isDeclSpec, AttributeList *attrs) { 3973 // Scan through and apply attributes to this type where it makes sense. Some 3974 // attributes (such as __address_space__, __vector_size__, etc) apply to the 3975 // type, but others can be present in the type specifiers even though they 3976 // apply to the decl. Here we apply type attributes and ignore the rest. 3977 3978 AttributeList *next; 3979 do { 3980 AttributeList &attr = *attrs; 3981 next = attr.getNext(); 3982 3983 // Skip attributes that were marked to be invalid. 3984 if (attr.isInvalid()) 3985 continue; 3986 3987 // If this is an attribute we can handle, do so now, 3988 // otherwise, add it to the FnAttrs list for rechaining. 3989 switch (attr.getKind()) { 3990 default: break; 3991 3992 case AttributeList::AT_MayAlias: 3993 // FIXME: This attribute needs to actually be handled, but if we ignore 3994 // it it breaks large amounts of Linux software. 3995 attr.setUsedAsTypeAttr(); 3996 break; 3997 case AttributeList::AT_AddressSpace: 3998 HandleAddressSpaceTypeAttribute(type, attr, state.getSema()); 3999 attr.setUsedAsTypeAttr(); 4000 break; 4001 OBJC_POINTER_TYPE_ATTRS_CASELIST: 4002 if (!handleObjCPointerTypeAttr(state, attr, type)) 4003 distributeObjCPointerTypeAttr(state, attr, type); 4004 attr.setUsedAsTypeAttr(); 4005 break; 4006 case AttributeList::AT_VectorSize: 4007 HandleVectorSizeAttr(type, attr, state.getSema()); 4008 attr.setUsedAsTypeAttr(); 4009 break; 4010 case AttributeList::AT_ExtVectorType: 4011 if (state.getDeclarator().getDeclSpec().getStorageClassSpec() 4012 != DeclSpec::SCS_typedef) 4013 HandleExtVectorTypeAttr(type, attr, state.getSema()); 4014 attr.setUsedAsTypeAttr(); 4015 break; 4016 case AttributeList::AT_NeonVectorType: 4017 HandleNeonVectorTypeAttr(type, attr, state.getSema(), 4018 VectorType::NeonVector, "neon_vector_type"); 4019 attr.setUsedAsTypeAttr(); 4020 break; 4021 case AttributeList::AT_NeonPolyVectorType: 4022 HandleNeonVectorTypeAttr(type, attr, state.getSema(), 4023 VectorType::NeonPolyVector, 4024 "neon_polyvector_type"); 4025 attr.setUsedAsTypeAttr(); 4026 break; 4027 case AttributeList::AT_OpenCLImageAccess: 4028 HandleOpenCLImageAccessAttribute(type, attr, state.getSema()); 4029 attr.setUsedAsTypeAttr(); 4030 break; 4031 4032 case AttributeList::AT_Win64: 4033 case AttributeList::AT_Ptr32: 4034 case AttributeList::AT_Ptr64: 4035 // FIXME: don't ignore these 4036 attr.setUsedAsTypeAttr(); 4037 break; 4038 4039 case AttributeList::AT_NSReturnsRetained: 4040 if (!state.getSema().getLangOpts().ObjCAutoRefCount) 4041 break; 4042 // fallthrough into the function attrs 4043 4044 FUNCTION_TYPE_ATTRS_CASELIST: 4045 attr.setUsedAsTypeAttr(); 4046 4047 // Never process function type attributes as part of the 4048 // declaration-specifiers. 4049 if (isDeclSpec) 4050 distributeFunctionTypeAttrFromDeclSpec(state, attr, type); 4051 4052 // Otherwise, handle the possible delays. 4053 else if (!handleFunctionTypeAttr(state, attr, type)) 4054 distributeFunctionTypeAttr(state, attr, type); 4055 break; 4056 } 4057 } while ((attrs = next)); 4058} 4059 4060/// \brief Ensure that the type of the given expression is complete. 4061/// 4062/// This routine checks whether the expression \p E has a complete type. If the 4063/// expression refers to an instantiable construct, that instantiation is 4064/// performed as needed to complete its type. Furthermore 4065/// Sema::RequireCompleteType is called for the expression's type (or in the 4066/// case of a reference type, the referred-to type). 4067/// 4068/// \param E The expression whose type is required to be complete. 4069/// \param Diagnoser The object that will emit a diagnostic if the type is 4070/// incomplete. 4071/// 4072/// \returns \c true if the type of \p E is incomplete and diagnosed, \c false 4073/// otherwise. 4074bool Sema::RequireCompleteExprType(Expr *E, TypeDiagnoser &Diagnoser){ 4075 QualType T = E->getType(); 4076 4077 // Fast path the case where the type is already complete. 4078 if (!T->isIncompleteType()) 4079 return false; 4080 4081 // Incomplete array types may be completed by the initializer attached to 4082 // their definitions. For static data members of class templates we need to 4083 // instantiate the definition to get this initializer and complete the type. 4084 if (T->isIncompleteArrayType()) { 4085 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E->IgnoreParens())) { 4086 if (VarDecl *Var = dyn_cast<VarDecl>(DRE->getDecl())) { 4087 if (Var->isStaticDataMember() && 4088 Var->getInstantiatedFromStaticDataMember()) { 4089 4090 MemberSpecializationInfo *MSInfo = Var->getMemberSpecializationInfo(); 4091 assert(MSInfo && "Missing member specialization information?"); 4092 if (MSInfo->getTemplateSpecializationKind() 4093 != TSK_ExplicitSpecialization) { 4094 // If we don't already have a point of instantiation, this is it. 4095 if (MSInfo->getPointOfInstantiation().isInvalid()) { 4096 MSInfo->setPointOfInstantiation(E->getLocStart()); 4097 4098 // This is a modification of an existing AST node. Notify 4099 // listeners. 4100 if (ASTMutationListener *L = getASTMutationListener()) 4101 L->StaticDataMemberInstantiated(Var); 4102 } 4103 4104 InstantiateStaticDataMemberDefinition(E->getExprLoc(), Var); 4105 4106 // Update the type to the newly instantiated definition's type both 4107 // here and within the expression. 4108 if (VarDecl *Def = Var->getDefinition()) { 4109 DRE->setDecl(Def); 4110 T = Def->getType(); 4111 DRE->setType(T); 4112 E->setType(T); 4113 } 4114 } 4115 4116 // We still go on to try to complete the type independently, as it 4117 // may also require instantiations or diagnostics if it remains 4118 // incomplete. 4119 } 4120 } 4121 } 4122 } 4123 4124 // FIXME: Are there other cases which require instantiating something other 4125 // than the type to complete the type of an expression? 4126 4127 // Look through reference types and complete the referred type. 4128 if (const ReferenceType *Ref = T->getAs<ReferenceType>()) 4129 T = Ref->getPointeeType(); 4130 4131 return RequireCompleteType(E->getExprLoc(), T, Diagnoser); 4132} 4133 4134namespace { 4135 struct TypeDiagnoserDiag : Sema::TypeDiagnoser { 4136 unsigned DiagID; 4137 4138 TypeDiagnoserDiag(unsigned DiagID) 4139 : Sema::TypeDiagnoser(DiagID == 0), DiagID(DiagID) {} 4140 4141 virtual void diagnose(Sema &S, SourceLocation Loc, QualType T) { 4142 if (Suppressed) return; 4143 S.Diag(Loc, DiagID) << T; 4144 } 4145 }; 4146} 4147 4148bool Sema::RequireCompleteExprType(Expr *E, unsigned DiagID) { 4149 TypeDiagnoserDiag Diagnoser(DiagID); 4150 return RequireCompleteExprType(E, Diagnoser); 4151} 4152 4153/// @brief Ensure that the type T is a complete type. 4154/// 4155/// This routine checks whether the type @p T is complete in any 4156/// context where a complete type is required. If @p T is a complete 4157/// type, returns false. If @p T is a class template specialization, 4158/// this routine then attempts to perform class template 4159/// instantiation. If instantiation fails, or if @p T is incomplete 4160/// and cannot be completed, issues the diagnostic @p diag (giving it 4161/// the type @p T) and returns true. 4162/// 4163/// @param Loc The location in the source that the incomplete type 4164/// diagnostic should refer to. 4165/// 4166/// @param T The type that this routine is examining for completeness. 4167/// 4168/// @returns @c true if @p T is incomplete and a diagnostic was emitted, 4169/// @c false otherwise. 4170bool Sema::RequireCompleteType(SourceLocation Loc, QualType T, 4171 TypeDiagnoser &Diagnoser) { 4172 // FIXME: Add this assertion to make sure we always get instantiation points. 4173 // assert(!Loc.isInvalid() && "Invalid location in RequireCompleteType"); 4174 // FIXME: Add this assertion to help us flush out problems with 4175 // checking for dependent types and type-dependent expressions. 4176 // 4177 // assert(!T->isDependentType() && 4178 // "Can't ask whether a dependent type is complete"); 4179 4180 // If we have a complete type, we're done. 4181 NamedDecl *Def = 0; 4182 if (!T->isIncompleteType(&Def)) { 4183 // If we know about the definition but it is not visible, complain. 4184 if (!Diagnoser.Suppressed && Def && !LookupResult::isVisible(Def)) { 4185 // Suppress this error outside of a SFINAE context if we've already 4186 // emitted the error once for this type. There's no usefulness in 4187 // repeating the diagnostic. 4188 // FIXME: Add a Fix-It that imports the corresponding module or includes 4189 // the header. 4190 if (isSFINAEContext() || HiddenDefinitions.insert(Def)) { 4191 Diag(Loc, diag::err_module_private_definition) << T; 4192 Diag(Def->getLocation(), diag::note_previous_definition); 4193 } 4194 } 4195 4196 return false; 4197 } 4198 4199 const TagType *Tag = T->getAs<TagType>(); 4200 const ObjCInterfaceType *IFace = 0; 4201 4202 if (Tag) { 4203 // Avoid diagnosing invalid decls as incomplete. 4204 if (Tag->getDecl()->isInvalidDecl()) 4205 return true; 4206 4207 // Give the external AST source a chance to complete the type. 4208 if (Tag->getDecl()->hasExternalLexicalStorage()) { 4209 Context.getExternalSource()->CompleteType(Tag->getDecl()); 4210 if (!Tag->isIncompleteType()) 4211 return false; 4212 } 4213 } 4214 else if ((IFace = T->getAs<ObjCInterfaceType>())) { 4215 // Avoid diagnosing invalid decls as incomplete. 4216 if (IFace->getDecl()->isInvalidDecl()) 4217 return true; 4218 4219 // Give the external AST source a chance to complete the type. 4220 if (IFace->getDecl()->hasExternalLexicalStorage()) { 4221 Context.getExternalSource()->CompleteType(IFace->getDecl()); 4222 if (!IFace->isIncompleteType()) 4223 return false; 4224 } 4225 } 4226 4227 // If we have a class template specialization or a class member of a 4228 // class template specialization, or an array with known size of such, 4229 // try to instantiate it. 4230 QualType MaybeTemplate = T; 4231 while (const ConstantArrayType *Array 4232 = Context.getAsConstantArrayType(MaybeTemplate)) 4233 MaybeTemplate = Array->getElementType(); 4234 if (const RecordType *Record = MaybeTemplate->getAs<RecordType>()) { 4235 if (ClassTemplateSpecializationDecl *ClassTemplateSpec 4236 = dyn_cast<ClassTemplateSpecializationDecl>(Record->getDecl())) { 4237 if (ClassTemplateSpec->getSpecializationKind() == TSK_Undeclared) 4238 return InstantiateClassTemplateSpecialization(Loc, ClassTemplateSpec, 4239 TSK_ImplicitInstantiation, 4240 /*Complain=*/!Diagnoser.Suppressed); 4241 } else if (CXXRecordDecl *Rec 4242 = dyn_cast<CXXRecordDecl>(Record->getDecl())) { 4243 CXXRecordDecl *Pattern = Rec->getInstantiatedFromMemberClass(); 4244 if (!Rec->isBeingDefined() && Pattern) { 4245 MemberSpecializationInfo *MSI = Rec->getMemberSpecializationInfo(); 4246 assert(MSI && "Missing member specialization information?"); 4247 // This record was instantiated from a class within a template. 4248 if (MSI->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 4249 return InstantiateClass(Loc, Rec, Pattern, 4250 getTemplateInstantiationArgs(Rec), 4251 TSK_ImplicitInstantiation, 4252 /*Complain=*/!Diagnoser.Suppressed); 4253 } 4254 } 4255 } 4256 4257 if (Diagnoser.Suppressed) 4258 return true; 4259 4260 // We have an incomplete type. Produce a diagnostic. 4261 Diagnoser.diagnose(*this, Loc, T); 4262 4263 // If the type was a forward declaration of a class/struct/union 4264 // type, produce a note. 4265 if (Tag && !Tag->getDecl()->isInvalidDecl()) 4266 Diag(Tag->getDecl()->getLocation(), 4267 Tag->isBeingDefined() ? diag::note_type_being_defined 4268 : diag::note_forward_declaration) 4269 << QualType(Tag, 0); 4270 4271 // If the Objective-C class was a forward declaration, produce a note. 4272 if (IFace && !IFace->getDecl()->isInvalidDecl()) 4273 Diag(IFace->getDecl()->getLocation(), diag::note_forward_class); 4274 4275 return true; 4276} 4277 4278bool Sema::RequireCompleteType(SourceLocation Loc, QualType T, 4279 unsigned DiagID) { 4280 TypeDiagnoserDiag Diagnoser(DiagID); 4281 return RequireCompleteType(Loc, T, Diagnoser); 4282} 4283 4284/// @brief Ensure that the type T is a literal type. 4285/// 4286/// This routine checks whether the type @p T is a literal type. If @p T is an 4287/// incomplete type, an attempt is made to complete it. If @p T is a literal 4288/// type, or @p AllowIncompleteType is true and @p T is an incomplete type, 4289/// returns false. Otherwise, this routine issues the diagnostic @p PD (giving 4290/// it the type @p T), along with notes explaining why the type is not a 4291/// literal type, and returns true. 4292/// 4293/// @param Loc The location in the source that the non-literal type 4294/// diagnostic should refer to. 4295/// 4296/// @param T The type that this routine is examining for literalness. 4297/// 4298/// @param Diagnoser Emits a diagnostic if T is not a literal type. 4299/// 4300/// @returns @c true if @p T is not a literal type and a diagnostic was emitted, 4301/// @c false otherwise. 4302bool Sema::RequireLiteralType(SourceLocation Loc, QualType T, 4303 TypeDiagnoser &Diagnoser) { 4304 assert(!T->isDependentType() && "type should not be dependent"); 4305 4306 QualType ElemType = Context.getBaseElementType(T); 4307 RequireCompleteType(Loc, ElemType, 0); 4308 4309 if (T->isLiteralType()) 4310 return false; 4311 4312 if (Diagnoser.Suppressed) 4313 return true; 4314 4315 Diagnoser.diagnose(*this, Loc, T); 4316 4317 if (T->isVariableArrayType()) 4318 return true; 4319 4320 const RecordType *RT = ElemType->getAs<RecordType>(); 4321 if (!RT) 4322 return true; 4323 4324 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 4325 4326 // A partially-defined class type can't be a literal type, because a literal 4327 // class type must have a trivial destructor (which can't be checked until 4328 // the class definition is complete). 4329 if (!RD->isCompleteDefinition()) { 4330 RequireCompleteType(Loc, ElemType, diag::note_non_literal_incomplete, T); 4331 return true; 4332 } 4333 4334 // If the class has virtual base classes, then it's not an aggregate, and 4335 // cannot have any constexpr constructors or a trivial default constructor, 4336 // so is non-literal. This is better to diagnose than the resulting absence 4337 // of constexpr constructors. 4338 if (RD->getNumVBases()) { 4339 Diag(RD->getLocation(), diag::note_non_literal_virtual_base) 4340 << RD->isStruct() << RD->getNumVBases(); 4341 for (CXXRecordDecl::base_class_const_iterator I = RD->vbases_begin(), 4342 E = RD->vbases_end(); I != E; ++I) 4343 Diag(I->getLocStart(), 4344 diag::note_constexpr_virtual_base_here) << I->getSourceRange(); 4345 } else if (!RD->isAggregate() && !RD->hasConstexprNonCopyMoveConstructor() && 4346 !RD->hasTrivialDefaultConstructor()) { 4347 Diag(RD->getLocation(), diag::note_non_literal_no_constexpr_ctors) << RD; 4348 } else if (RD->hasNonLiteralTypeFieldsOrBases()) { 4349 for (CXXRecordDecl::base_class_const_iterator I = RD->bases_begin(), 4350 E = RD->bases_end(); I != E; ++I) { 4351 if (!I->getType()->isLiteralType()) { 4352 Diag(I->getLocStart(), 4353 diag::note_non_literal_base_class) 4354 << RD << I->getType() << I->getSourceRange(); 4355 return true; 4356 } 4357 } 4358 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 4359 E = RD->field_end(); I != E; ++I) { 4360 if (!I->getType()->isLiteralType() || 4361 I->getType().isVolatileQualified()) { 4362 Diag(I->getLocation(), diag::note_non_literal_field) 4363 << RD << *I << I->getType() 4364 << I->getType().isVolatileQualified(); 4365 return true; 4366 } 4367 } 4368 } else if (!RD->hasTrivialDestructor()) { 4369 // All fields and bases are of literal types, so have trivial destructors. 4370 // If this class's destructor is non-trivial it must be user-declared. 4371 CXXDestructorDecl *Dtor = RD->getDestructor(); 4372 assert(Dtor && "class has literal fields and bases but no dtor?"); 4373 if (!Dtor) 4374 return true; 4375 4376 Diag(Dtor->getLocation(), Dtor->isUserProvided() ? 4377 diag::note_non_literal_user_provided_dtor : 4378 diag::note_non_literal_nontrivial_dtor) << RD; 4379 } 4380 4381 return true; 4382} 4383 4384bool Sema::RequireLiteralType(SourceLocation Loc, QualType T, unsigned DiagID) { 4385 TypeDiagnoserDiag Diagnoser(DiagID); 4386 return RequireLiteralType(Loc, T, Diagnoser); 4387} 4388 4389/// \brief Retrieve a version of the type 'T' that is elaborated by Keyword 4390/// and qualified by the nested-name-specifier contained in SS. 4391QualType Sema::getElaboratedType(ElaboratedTypeKeyword Keyword, 4392 const CXXScopeSpec &SS, QualType T) { 4393 if (T.isNull()) 4394 return T; 4395 NestedNameSpecifier *NNS; 4396 if (SS.isValid()) 4397 NNS = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 4398 else { 4399 if (Keyword == ETK_None) 4400 return T; 4401 NNS = 0; 4402 } 4403 return Context.getElaboratedType(Keyword, NNS, T); 4404} 4405 4406QualType Sema::BuildTypeofExprType(Expr *E, SourceLocation Loc) { 4407 ExprResult ER = CheckPlaceholderExpr(E); 4408 if (ER.isInvalid()) return QualType(); 4409 E = ER.take(); 4410 4411 if (!E->isTypeDependent()) { 4412 QualType T = E->getType(); 4413 if (const TagType *TT = T->getAs<TagType>()) 4414 DiagnoseUseOfDecl(TT->getDecl(), E->getExprLoc()); 4415 } 4416 return Context.getTypeOfExprType(E); 4417} 4418 4419/// getDecltypeForExpr - Given an expr, will return the decltype for 4420/// that expression, according to the rules in C++11 4421/// [dcl.type.simple]p4 and C++11 [expr.lambda.prim]p18. 4422static QualType getDecltypeForExpr(Sema &S, Expr *E) { 4423 if (E->isTypeDependent()) 4424 return S.Context.DependentTy; 4425 4426 // C++11 [dcl.type.simple]p4: 4427 // The type denoted by decltype(e) is defined as follows: 4428 // 4429 // - if e is an unparenthesized id-expression or an unparenthesized class 4430 // member access (5.2.5), decltype(e) is the type of the entity named 4431 // by e. If there is no such entity, or if e names a set of overloaded 4432 // functions, the program is ill-formed; 4433 if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E)) { 4434 if (const ValueDecl *VD = dyn_cast<ValueDecl>(DRE->getDecl())) 4435 return VD->getType(); 4436 } 4437 if (const MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 4438 if (const FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl())) 4439 return FD->getType(); 4440 } 4441 4442 // C++11 [expr.lambda.prim]p18: 4443 // Every occurrence of decltype((x)) where x is a possibly 4444 // parenthesized id-expression that names an entity of automatic 4445 // storage duration is treated as if x were transformed into an 4446 // access to a corresponding data member of the closure type that 4447 // would have been declared if x were an odr-use of the denoted 4448 // entity. 4449 using namespace sema; 4450 if (S.getCurLambda()) { 4451 if (isa<ParenExpr>(E)) { 4452 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E->IgnoreParens())) { 4453 if (VarDecl *Var = dyn_cast<VarDecl>(DRE->getDecl())) { 4454 QualType T = S.getCapturedDeclRefType(Var, DRE->getLocation()); 4455 if (!T.isNull()) 4456 return S.Context.getLValueReferenceType(T); 4457 } 4458 } 4459 } 4460 } 4461 4462 4463 // C++11 [dcl.type.simple]p4: 4464 // [...] 4465 QualType T = E->getType(); 4466 switch (E->getValueKind()) { 4467 // - otherwise, if e is an xvalue, decltype(e) is T&&, where T is the 4468 // type of e; 4469 case VK_XValue: T = S.Context.getRValueReferenceType(T); break; 4470 // - otherwise, if e is an lvalue, decltype(e) is T&, where T is the 4471 // type of e; 4472 case VK_LValue: T = S.Context.getLValueReferenceType(T); break; 4473 // - otherwise, decltype(e) is the type of e. 4474 case VK_RValue: break; 4475 } 4476 4477 return T; 4478} 4479 4480QualType Sema::BuildDecltypeType(Expr *E, SourceLocation Loc) { 4481 ExprResult ER = CheckPlaceholderExpr(E); 4482 if (ER.isInvalid()) return QualType(); 4483 E = ER.take(); 4484 4485 return Context.getDecltypeType(E, getDecltypeForExpr(*this, E)); 4486} 4487 4488QualType Sema::BuildUnaryTransformType(QualType BaseType, 4489 UnaryTransformType::UTTKind UKind, 4490 SourceLocation Loc) { 4491 switch (UKind) { 4492 case UnaryTransformType::EnumUnderlyingType: 4493 if (!BaseType->isDependentType() && !BaseType->isEnumeralType()) { 4494 Diag(Loc, diag::err_only_enums_have_underlying_types); 4495 return QualType(); 4496 } else { 4497 QualType Underlying = BaseType; 4498 if (!BaseType->isDependentType()) { 4499 EnumDecl *ED = BaseType->getAs<EnumType>()->getDecl(); 4500 assert(ED && "EnumType has no EnumDecl"); 4501 DiagnoseUseOfDecl(ED, Loc); 4502 Underlying = ED->getIntegerType(); 4503 } 4504 assert(!Underlying.isNull()); 4505 return Context.getUnaryTransformType(BaseType, Underlying, 4506 UnaryTransformType::EnumUnderlyingType); 4507 } 4508 } 4509 llvm_unreachable("unknown unary transform type"); 4510} 4511 4512QualType Sema::BuildAtomicType(QualType T, SourceLocation Loc) { 4513 if (!T->isDependentType()) { 4514 // FIXME: It isn't entirely clear whether incomplete atomic types 4515 // are allowed or not; for simplicity, ban them for the moment. 4516 if (RequireCompleteType(Loc, T, diag::err_atomic_specifier_bad_type, 0)) 4517 return QualType(); 4518 4519 int DisallowedKind = -1; 4520 if (T->isArrayType()) 4521 DisallowedKind = 1; 4522 else if (T->isFunctionType()) 4523 DisallowedKind = 2; 4524 else if (T->isReferenceType()) 4525 DisallowedKind = 3; 4526 else if (T->isAtomicType()) 4527 DisallowedKind = 4; 4528 else if (T.hasQualifiers()) 4529 DisallowedKind = 5; 4530 else if (!T.isTriviallyCopyableType(Context)) 4531 // Some other non-trivially-copyable type (probably a C++ class) 4532 DisallowedKind = 6; 4533 4534 if (DisallowedKind != -1) { 4535 Diag(Loc, diag::err_atomic_specifier_bad_type) << DisallowedKind << T; 4536 return QualType(); 4537 } 4538 4539 // FIXME: Do we need any handling for ARC here? 4540 } 4541 4542 // Build the pointer type. 4543 return Context.getAtomicType(T); 4544} 4545