SemaType.cpp revision aa0cd85838f2a024e589ea4e8c2094130065af21
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 Loc The location of the entity whose type involves this 1235/// array type or, if there is no such entity, the location of the 1236/// type that will have array type. 1237/// 1238/// \param Entity The name of the entity that involves the array 1239/// type, if known. 1240/// 1241/// \returns A suitable array type, if there are no errors. Otherwise, 1242/// returns a NULL type. 1243QualType Sema::BuildArrayType(QualType T, ArrayType::ArraySizeModifier ASM, 1244 Expr *ArraySize, unsigned Quals, 1245 SourceRange Brackets, DeclarationName Entity) { 1246 1247 SourceLocation Loc = Brackets.getBegin(); 1248 if (getLangOpts().CPlusPlus) { 1249 // C++ [dcl.array]p1: 1250 // T is called the array element type; this type shall not be a reference 1251 // type, the (possibly cv-qualified) type void, a function type or an 1252 // abstract class type. 1253 // 1254 // Note: function types are handled in the common path with C. 1255 if (T->isReferenceType()) { 1256 Diag(Loc, diag::err_illegal_decl_array_of_references) 1257 << getPrintableNameForEntity(Entity) << T; 1258 return QualType(); 1259 } 1260 1261 if (T->isVoidType()) { 1262 Diag(Loc, diag::err_illegal_decl_array_incomplete_type) << T; 1263 return QualType(); 1264 } 1265 1266 if (RequireNonAbstractType(Brackets.getBegin(), T, 1267 diag::err_array_of_abstract_type)) 1268 return QualType(); 1269 1270 } else { 1271 // C99 6.7.5.2p1: If the element type is an incomplete or function type, 1272 // reject it (e.g. void ary[7], struct foo ary[7], void ary[7]()) 1273 if (RequireCompleteType(Loc, T, 1274 diag::err_illegal_decl_array_incomplete_type)) 1275 return QualType(); 1276 } 1277 1278 if (T->isFunctionType()) { 1279 Diag(Loc, diag::err_illegal_decl_array_of_functions) 1280 << getPrintableNameForEntity(Entity) << T; 1281 return QualType(); 1282 } 1283 1284 if (T->getContainedAutoType()) { 1285 Diag(Loc, diag::err_illegal_decl_array_of_auto) 1286 << getPrintableNameForEntity(Entity) << T; 1287 return QualType(); 1288 } 1289 1290 if (const RecordType *EltTy = T->getAs<RecordType>()) { 1291 // If the element type is a struct or union that contains a variadic 1292 // array, accept it as a GNU extension: C99 6.7.2.1p2. 1293 if (EltTy->getDecl()->hasFlexibleArrayMember()) 1294 Diag(Loc, diag::ext_flexible_array_in_array) << T; 1295 } else if (T->isObjCObjectType()) { 1296 Diag(Loc, diag::err_objc_array_of_interfaces) << T; 1297 return QualType(); 1298 } 1299 1300 // Do placeholder conversions on the array size expression. 1301 if (ArraySize && ArraySize->hasPlaceholderType()) { 1302 ExprResult Result = CheckPlaceholderExpr(ArraySize); 1303 if (Result.isInvalid()) return QualType(); 1304 ArraySize = Result.take(); 1305 } 1306 1307 // Do lvalue-to-rvalue conversions on the array size expression. 1308 if (ArraySize && !ArraySize->isRValue()) { 1309 ExprResult Result = DefaultLvalueConversion(ArraySize); 1310 if (Result.isInvalid()) 1311 return QualType(); 1312 1313 ArraySize = Result.take(); 1314 } 1315 1316 // C99 6.7.5.2p1: The size expression shall have integer type. 1317 // C++11 allows contextual conversions to such types. 1318 if (!getLangOpts().CPlusPlus0x && 1319 ArraySize && !ArraySize->isTypeDependent() && 1320 !ArraySize->getType()->isIntegralOrUnscopedEnumerationType()) { 1321 Diag(ArraySize->getLocStart(), diag::err_array_size_non_int) 1322 << ArraySize->getType() << ArraySize->getSourceRange(); 1323 return QualType(); 1324 } 1325 1326 llvm::APSInt ConstVal(Context.getTypeSize(Context.getSizeType())); 1327 if (!ArraySize) { 1328 if (ASM == ArrayType::Star) 1329 T = Context.getVariableArrayType(T, 0, ASM, Quals, Brackets); 1330 else 1331 T = Context.getIncompleteArrayType(T, ASM, Quals); 1332 } else if (ArraySize->isTypeDependent() || ArraySize->isValueDependent()) { 1333 T = Context.getDependentSizedArrayType(T, ArraySize, ASM, Quals, Brackets); 1334 } else if ((!T->isDependentType() && !T->isIncompleteType() && 1335 !T->isConstantSizeType()) || 1336 isArraySizeVLA(*this, ArraySize, ConstVal)) { 1337 // Even in C++11, don't allow contextual conversions in the array bound 1338 // of a VLA. 1339 if (getLangOpts().CPlusPlus0x && 1340 !ArraySize->getType()->isIntegralOrUnscopedEnumerationType()) { 1341 Diag(ArraySize->getLocStart(), diag::err_array_size_non_int) 1342 << ArraySize->getType() << ArraySize->getSourceRange(); 1343 return QualType(); 1344 } 1345 1346 // C99: an array with an element type that has a non-constant-size is a VLA. 1347 // C99: an array with a non-ICE size is a VLA. We accept any expression 1348 // that we can fold to a non-zero positive value as an extension. 1349 T = Context.getVariableArrayType(T, ArraySize, ASM, Quals, Brackets); 1350 } else { 1351 // C99 6.7.5.2p1: If the expression is a constant expression, it shall 1352 // have a value greater than zero. 1353 if (ConstVal.isSigned() && ConstVal.isNegative()) { 1354 if (Entity) 1355 Diag(ArraySize->getLocStart(), diag::err_decl_negative_array_size) 1356 << getPrintableNameForEntity(Entity) << ArraySize->getSourceRange(); 1357 else 1358 Diag(ArraySize->getLocStart(), diag::err_typecheck_negative_array_size) 1359 << ArraySize->getSourceRange(); 1360 return QualType(); 1361 } 1362 if (ConstVal == 0) { 1363 // GCC accepts zero sized static arrays. We allow them when 1364 // we're not in a SFINAE context. 1365 Diag(ArraySize->getLocStart(), 1366 isSFINAEContext()? diag::err_typecheck_zero_array_size 1367 : diag::ext_typecheck_zero_array_size) 1368 << ArraySize->getSourceRange(); 1369 1370 if (ASM == ArrayType::Static) { 1371 Diag(ArraySize->getLocStart(), 1372 diag::warn_typecheck_zero_static_array_size) 1373 << ArraySize->getSourceRange(); 1374 ASM = ArrayType::Normal; 1375 } 1376 } else if (!T->isDependentType() && !T->isVariablyModifiedType() && 1377 !T->isIncompleteType()) { 1378 // Is the array too large? 1379 unsigned ActiveSizeBits 1380 = ConstantArrayType::getNumAddressingBits(Context, T, ConstVal); 1381 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) 1382 Diag(ArraySize->getLocStart(), diag::err_array_too_large) 1383 << ConstVal.toString(10) 1384 << ArraySize->getSourceRange(); 1385 } 1386 1387 T = Context.getConstantArrayType(T, ConstVal, ASM, Quals); 1388 } 1389 // If this is not C99, extwarn about VLA's and C99 array size modifiers. 1390 if (!getLangOpts().C99) { 1391 if (T->isVariableArrayType()) { 1392 // Prohibit the use of non-POD types in VLAs. 1393 QualType BaseT = Context.getBaseElementType(T); 1394 if (!T->isDependentType() && 1395 !BaseT.isPODType(Context) && 1396 !BaseT->isObjCLifetimeType()) { 1397 Diag(Loc, diag::err_vla_non_pod) 1398 << BaseT; 1399 return QualType(); 1400 } 1401 // Prohibit the use of VLAs during template argument deduction. 1402 else if (isSFINAEContext()) { 1403 Diag(Loc, diag::err_vla_in_sfinae); 1404 return QualType(); 1405 } 1406 // Just extwarn about VLAs. 1407 else 1408 Diag(Loc, diag::ext_vla); 1409 } else if (ASM != ArrayType::Normal || Quals != 0) 1410 Diag(Loc, 1411 getLangOpts().CPlusPlus? diag::err_c99_array_usage_cxx 1412 : diag::ext_c99_array_usage) << ASM; 1413 } 1414 1415 return T; 1416} 1417 1418/// \brief Build an ext-vector type. 1419/// 1420/// Run the required checks for the extended vector type. 1421QualType Sema::BuildExtVectorType(QualType T, Expr *ArraySize, 1422 SourceLocation AttrLoc) { 1423 // unlike gcc's vector_size attribute, we do not allow vectors to be defined 1424 // in conjunction with complex types (pointers, arrays, functions, etc.). 1425 if (!T->isDependentType() && 1426 !T->isIntegerType() && !T->isRealFloatingType()) { 1427 Diag(AttrLoc, diag::err_attribute_invalid_vector_type) << T; 1428 return QualType(); 1429 } 1430 1431 if (!ArraySize->isTypeDependent() && !ArraySize->isValueDependent()) { 1432 llvm::APSInt vecSize(32); 1433 if (!ArraySize->isIntegerConstantExpr(vecSize, Context)) { 1434 Diag(AttrLoc, diag::err_attribute_argument_not_int) 1435 << "ext_vector_type" << ArraySize->getSourceRange(); 1436 return QualType(); 1437 } 1438 1439 // unlike gcc's vector_size attribute, the size is specified as the 1440 // number of elements, not the number of bytes. 1441 unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue()); 1442 1443 if (vectorSize == 0) { 1444 Diag(AttrLoc, diag::err_attribute_zero_size) 1445 << ArraySize->getSourceRange(); 1446 return QualType(); 1447 } 1448 1449 return Context.getExtVectorType(T, vectorSize); 1450 } 1451 1452 return Context.getDependentSizedExtVectorType(T, ArraySize, AttrLoc); 1453} 1454 1455/// \brief Build a function type. 1456/// 1457/// This routine checks the function type according to C++ rules and 1458/// under the assumption that the result type and parameter types have 1459/// just been instantiated from a template. It therefore duplicates 1460/// some of the behavior of GetTypeForDeclarator, but in a much 1461/// simpler form that is only suitable for this narrow use case. 1462/// 1463/// \param T The return type of the function. 1464/// 1465/// \param ParamTypes The parameter types of the function. This array 1466/// will be modified to account for adjustments to the types of the 1467/// function parameters. 1468/// 1469/// \param NumParamTypes The number of parameter types in ParamTypes. 1470/// 1471/// \param Variadic Whether this is a variadic function type. 1472/// 1473/// \param HasTrailingReturn Whether this function has a trailing return type. 1474/// 1475/// \param Quals The cvr-qualifiers to be applied to the function type. 1476/// 1477/// \param Loc The location of the entity whose type involves this 1478/// function type or, if there is no such entity, the location of the 1479/// type that will have function type. 1480/// 1481/// \param Entity The name of the entity that involves the function 1482/// type, if known. 1483/// 1484/// \returns A suitable function type, if there are no 1485/// errors. Otherwise, returns a NULL type. 1486QualType Sema::BuildFunctionType(QualType T, 1487 QualType *ParamTypes, 1488 unsigned NumParamTypes, 1489 bool Variadic, bool HasTrailingReturn, 1490 unsigned Quals, 1491 RefQualifierKind RefQualifier, 1492 SourceLocation Loc, DeclarationName Entity, 1493 FunctionType::ExtInfo Info) { 1494 if (T->isArrayType() || T->isFunctionType()) { 1495 Diag(Loc, diag::err_func_returning_array_function) 1496 << T->isFunctionType() << T; 1497 return QualType(); 1498 } 1499 1500 // Functions cannot return half FP. 1501 if (T->isHalfType()) { 1502 Diag(Loc, diag::err_parameters_retval_cannot_have_fp16_type) << 1 << 1503 FixItHint::CreateInsertion(Loc, "*"); 1504 return QualType(); 1505 } 1506 1507 bool Invalid = false; 1508 for (unsigned Idx = 0; Idx < NumParamTypes; ++Idx) { 1509 // FIXME: Loc is too inprecise here, should use proper locations for args. 1510 QualType ParamType = Context.getAdjustedParameterType(ParamTypes[Idx]); 1511 if (ParamType->isVoidType()) { 1512 Diag(Loc, diag::err_param_with_void_type); 1513 Invalid = true; 1514 } else if (ParamType->isHalfType()) { 1515 // Disallow half FP arguments. 1516 Diag(Loc, diag::err_parameters_retval_cannot_have_fp16_type) << 0 << 1517 FixItHint::CreateInsertion(Loc, "*"); 1518 Invalid = true; 1519 } 1520 1521 ParamTypes[Idx] = ParamType; 1522 } 1523 1524 if (Invalid) 1525 return QualType(); 1526 1527 FunctionProtoType::ExtProtoInfo EPI; 1528 EPI.Variadic = Variadic; 1529 EPI.HasTrailingReturn = HasTrailingReturn; 1530 EPI.TypeQuals = Quals; 1531 EPI.RefQualifier = RefQualifier; 1532 EPI.ExtInfo = Info; 1533 1534 return Context.getFunctionType(T, ParamTypes, NumParamTypes, EPI); 1535} 1536 1537/// \brief Build a member pointer type \c T Class::*. 1538/// 1539/// \param T the type to which the member pointer refers. 1540/// \param Class the class type into which the member pointer points. 1541/// \param Loc the location where this type begins 1542/// \param Entity the name of the entity that will have this member pointer type 1543/// 1544/// \returns a member pointer type, if successful, or a NULL type if there was 1545/// an error. 1546QualType Sema::BuildMemberPointerType(QualType T, QualType Class, 1547 SourceLocation Loc, 1548 DeclarationName Entity) { 1549 // Verify that we're not building a pointer to pointer to function with 1550 // exception specification. 1551 if (CheckDistantExceptionSpec(T)) { 1552 Diag(Loc, diag::err_distant_exception_spec); 1553 1554 // FIXME: If we're doing this as part of template instantiation, 1555 // we should return immediately. 1556 1557 // Build the type anyway, but use the canonical type so that the 1558 // exception specifiers are stripped off. 1559 T = Context.getCanonicalType(T); 1560 } 1561 1562 // C++ 8.3.3p3: A pointer to member shall not point to ... a member 1563 // with reference type, or "cv void." 1564 if (T->isReferenceType()) { 1565 Diag(Loc, diag::err_illegal_decl_mempointer_to_reference) 1566 << (Entity? Entity.getAsString() : "type name") << T; 1567 return QualType(); 1568 } 1569 1570 if (T->isVoidType()) { 1571 Diag(Loc, diag::err_illegal_decl_mempointer_to_void) 1572 << (Entity? Entity.getAsString() : "type name"); 1573 return QualType(); 1574 } 1575 1576 if (!Class->isDependentType() && !Class->isRecordType()) { 1577 Diag(Loc, diag::err_mempointer_in_nonclass_type) << Class; 1578 return QualType(); 1579 } 1580 1581 // In the Microsoft ABI, the class is allowed to be an incomplete 1582 // type. In such cases, the compiler makes a worst-case assumption. 1583 // We make no such assumption right now, so emit an error if the 1584 // class isn't a complete type. 1585 if (Context.getTargetInfo().getCXXABI() == CXXABI_Microsoft && 1586 RequireCompleteType(Loc, Class, diag::err_incomplete_type)) 1587 return QualType(); 1588 1589 return Context.getMemberPointerType(T, Class.getTypePtr()); 1590} 1591 1592/// \brief Build a block pointer type. 1593/// 1594/// \param T The type to which we'll be building a block pointer. 1595/// 1596/// \param CVR The cvr-qualifiers to be applied to the block pointer type. 1597/// 1598/// \param Entity The name of the entity that involves the block pointer 1599/// type, if known. 1600/// 1601/// \returns A suitable block pointer type, if there are no 1602/// errors. Otherwise, returns a NULL type. 1603QualType Sema::BuildBlockPointerType(QualType T, 1604 SourceLocation Loc, 1605 DeclarationName Entity) { 1606 if (!T->isFunctionType()) { 1607 Diag(Loc, diag::err_nonfunction_block_type); 1608 return QualType(); 1609 } 1610 1611 return Context.getBlockPointerType(T); 1612} 1613 1614QualType Sema::GetTypeFromParser(ParsedType Ty, TypeSourceInfo **TInfo) { 1615 QualType QT = Ty.get(); 1616 if (QT.isNull()) { 1617 if (TInfo) *TInfo = 0; 1618 return QualType(); 1619 } 1620 1621 TypeSourceInfo *DI = 0; 1622 if (const LocInfoType *LIT = dyn_cast<LocInfoType>(QT)) { 1623 QT = LIT->getType(); 1624 DI = LIT->getTypeSourceInfo(); 1625 } 1626 1627 if (TInfo) *TInfo = DI; 1628 return QT; 1629} 1630 1631static void transferARCOwnershipToDeclaratorChunk(TypeProcessingState &state, 1632 Qualifiers::ObjCLifetime ownership, 1633 unsigned chunkIndex); 1634 1635/// Given that this is the declaration of a parameter under ARC, 1636/// attempt to infer attributes and such for pointer-to-whatever 1637/// types. 1638static void inferARCWriteback(TypeProcessingState &state, 1639 QualType &declSpecType) { 1640 Sema &S = state.getSema(); 1641 Declarator &declarator = state.getDeclarator(); 1642 1643 // TODO: should we care about decl qualifiers? 1644 1645 // Check whether the declarator has the expected form. We walk 1646 // from the inside out in order to make the block logic work. 1647 unsigned outermostPointerIndex = 0; 1648 bool isBlockPointer = false; 1649 unsigned numPointers = 0; 1650 for (unsigned i = 0, e = declarator.getNumTypeObjects(); i != e; ++i) { 1651 unsigned chunkIndex = i; 1652 DeclaratorChunk &chunk = declarator.getTypeObject(chunkIndex); 1653 switch (chunk.Kind) { 1654 case DeclaratorChunk::Paren: 1655 // Ignore parens. 1656 break; 1657 1658 case DeclaratorChunk::Reference: 1659 case DeclaratorChunk::Pointer: 1660 // Count the number of pointers. Treat references 1661 // interchangeably as pointers; if they're mis-ordered, normal 1662 // type building will discover that. 1663 outermostPointerIndex = chunkIndex; 1664 numPointers++; 1665 break; 1666 1667 case DeclaratorChunk::BlockPointer: 1668 // If we have a pointer to block pointer, that's an acceptable 1669 // indirect reference; anything else is not an application of 1670 // the rules. 1671 if (numPointers != 1) return; 1672 numPointers++; 1673 outermostPointerIndex = chunkIndex; 1674 isBlockPointer = true; 1675 1676 // We don't care about pointer structure in return values here. 1677 goto done; 1678 1679 case DeclaratorChunk::Array: // suppress if written (id[])? 1680 case DeclaratorChunk::Function: 1681 case DeclaratorChunk::MemberPointer: 1682 return; 1683 } 1684 } 1685 done: 1686 1687 // If we have *one* pointer, then we want to throw the qualifier on 1688 // the declaration-specifiers, which means that it needs to be a 1689 // retainable object type. 1690 if (numPointers == 1) { 1691 // If it's not a retainable object type, the rule doesn't apply. 1692 if (!declSpecType->isObjCRetainableType()) return; 1693 1694 // If it already has lifetime, don't do anything. 1695 if (declSpecType.getObjCLifetime()) return; 1696 1697 // Otherwise, modify the type in-place. 1698 Qualifiers qs; 1699 1700 if (declSpecType->isObjCARCImplicitlyUnretainedType()) 1701 qs.addObjCLifetime(Qualifiers::OCL_ExplicitNone); 1702 else 1703 qs.addObjCLifetime(Qualifiers::OCL_Autoreleasing); 1704 declSpecType = S.Context.getQualifiedType(declSpecType, qs); 1705 1706 // If we have *two* pointers, then we want to throw the qualifier on 1707 // the outermost pointer. 1708 } else if (numPointers == 2) { 1709 // If we don't have a block pointer, we need to check whether the 1710 // declaration-specifiers gave us something that will turn into a 1711 // retainable object pointer after we slap the first pointer on it. 1712 if (!isBlockPointer && !declSpecType->isObjCObjectType()) 1713 return; 1714 1715 // Look for an explicit lifetime attribute there. 1716 DeclaratorChunk &chunk = declarator.getTypeObject(outermostPointerIndex); 1717 if (chunk.Kind != DeclaratorChunk::Pointer && 1718 chunk.Kind != DeclaratorChunk::BlockPointer) 1719 return; 1720 for (const AttributeList *attr = chunk.getAttrs(); attr; 1721 attr = attr->getNext()) 1722 if (attr->getKind() == AttributeList::AT_ObjCOwnership) 1723 return; 1724 1725 transferARCOwnershipToDeclaratorChunk(state, Qualifiers::OCL_Autoreleasing, 1726 outermostPointerIndex); 1727 1728 // Any other number of pointers/references does not trigger the rule. 1729 } else return; 1730 1731 // TODO: mark whether we did this inference? 1732} 1733 1734static void DiagnoseIgnoredQualifiers(unsigned Quals, 1735 SourceLocation ConstQualLoc, 1736 SourceLocation VolatileQualLoc, 1737 SourceLocation RestrictQualLoc, 1738 Sema& S) { 1739 std::string QualStr; 1740 unsigned NumQuals = 0; 1741 SourceLocation Loc; 1742 1743 FixItHint ConstFixIt; 1744 FixItHint VolatileFixIt; 1745 FixItHint RestrictFixIt; 1746 1747 const SourceManager &SM = S.getSourceManager(); 1748 1749 // FIXME: The locations here are set kind of arbitrarily. It'd be nicer to 1750 // find a range and grow it to encompass all the qualifiers, regardless of 1751 // the order in which they textually appear. 1752 if (Quals & Qualifiers::Const) { 1753 ConstFixIt = FixItHint::CreateRemoval(ConstQualLoc); 1754 QualStr = "const"; 1755 ++NumQuals; 1756 if (!Loc.isValid() || SM.isBeforeInTranslationUnit(ConstQualLoc, Loc)) 1757 Loc = ConstQualLoc; 1758 } 1759 if (Quals & Qualifiers::Volatile) { 1760 VolatileFixIt = FixItHint::CreateRemoval(VolatileQualLoc); 1761 QualStr += (NumQuals == 0 ? "volatile" : " volatile"); 1762 ++NumQuals; 1763 if (!Loc.isValid() || SM.isBeforeInTranslationUnit(VolatileQualLoc, Loc)) 1764 Loc = VolatileQualLoc; 1765 } 1766 if (Quals & Qualifiers::Restrict) { 1767 RestrictFixIt = FixItHint::CreateRemoval(RestrictQualLoc); 1768 QualStr += (NumQuals == 0 ? "restrict" : " restrict"); 1769 ++NumQuals; 1770 if (!Loc.isValid() || SM.isBeforeInTranslationUnit(RestrictQualLoc, Loc)) 1771 Loc = RestrictQualLoc; 1772 } 1773 1774 assert(NumQuals > 0 && "No known qualifiers?"); 1775 1776 S.Diag(Loc, diag::warn_qual_return_type) 1777 << QualStr << NumQuals << ConstFixIt << VolatileFixIt << RestrictFixIt; 1778} 1779 1780static QualType GetDeclSpecTypeForDeclarator(TypeProcessingState &state, 1781 TypeSourceInfo *&ReturnTypeInfo) { 1782 Sema &SemaRef = state.getSema(); 1783 Declarator &D = state.getDeclarator(); 1784 QualType T; 1785 ReturnTypeInfo = 0; 1786 1787 // The TagDecl owned by the DeclSpec. 1788 TagDecl *OwnedTagDecl = 0; 1789 1790 switch (D.getName().getKind()) { 1791 case UnqualifiedId::IK_ImplicitSelfParam: 1792 case UnqualifiedId::IK_OperatorFunctionId: 1793 case UnqualifiedId::IK_Identifier: 1794 case UnqualifiedId::IK_LiteralOperatorId: 1795 case UnqualifiedId::IK_TemplateId: 1796 T = ConvertDeclSpecToType(state); 1797 1798 if (!D.isInvalidType() && D.getDeclSpec().isTypeSpecOwned()) { 1799 OwnedTagDecl = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 1800 // Owned declaration is embedded in declarator. 1801 OwnedTagDecl->setEmbeddedInDeclarator(true); 1802 } 1803 break; 1804 1805 case UnqualifiedId::IK_ConstructorName: 1806 case UnqualifiedId::IK_ConstructorTemplateId: 1807 case UnqualifiedId::IK_DestructorName: 1808 // Constructors and destructors don't have return types. Use 1809 // "void" instead. 1810 T = SemaRef.Context.VoidTy; 1811 break; 1812 1813 case UnqualifiedId::IK_ConversionFunctionId: 1814 // The result type of a conversion function is the type that it 1815 // converts to. 1816 T = SemaRef.GetTypeFromParser(D.getName().ConversionFunctionId, 1817 &ReturnTypeInfo); 1818 break; 1819 } 1820 1821 if (D.getAttributes()) 1822 distributeTypeAttrsFromDeclarator(state, T); 1823 1824 // C++11 [dcl.spec.auto]p5: reject 'auto' if it is not in an allowed context. 1825 // In C++11, a function declarator using 'auto' must have a trailing return 1826 // type (this is checked later) and we can skip this. In other languages 1827 // using auto, we need to check regardless. 1828 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto && 1829 (!SemaRef.getLangOpts().CPlusPlus0x || !D.isFunctionDeclarator())) { 1830 int Error = -1; 1831 1832 switch (D.getContext()) { 1833 case Declarator::KNRTypeListContext: 1834 llvm_unreachable("K&R type lists aren't allowed in C++"); 1835 case Declarator::LambdaExprContext: 1836 llvm_unreachable("Can't specify a type specifier in lambda grammar"); 1837 case Declarator::ObjCParameterContext: 1838 case Declarator::ObjCResultContext: 1839 case Declarator::PrototypeContext: 1840 Error = 0; // Function prototype 1841 break; 1842 case Declarator::MemberContext: 1843 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_static) 1844 break; 1845 switch (cast<TagDecl>(SemaRef.CurContext)->getTagKind()) { 1846 case TTK_Enum: llvm_unreachable("unhandled tag kind"); 1847 case TTK_Struct: Error = 1; /* Struct member */ break; 1848 case TTK_Union: Error = 2; /* Union member */ break; 1849 case TTK_Class: Error = 3; /* Class member */ break; 1850 } 1851 break; 1852 case Declarator::CXXCatchContext: 1853 case Declarator::ObjCCatchContext: 1854 Error = 4; // Exception declaration 1855 break; 1856 case Declarator::TemplateParamContext: 1857 Error = 5; // Template parameter 1858 break; 1859 case Declarator::BlockLiteralContext: 1860 Error = 6; // Block literal 1861 break; 1862 case Declarator::TemplateTypeArgContext: 1863 Error = 7; // Template type argument 1864 break; 1865 case Declarator::AliasDeclContext: 1866 case Declarator::AliasTemplateContext: 1867 Error = 9; // Type alias 1868 break; 1869 case Declarator::TrailingReturnContext: 1870 Error = 10; // Function return type 1871 break; 1872 case Declarator::TypeNameContext: 1873 Error = 11; // Generic 1874 break; 1875 case Declarator::FileContext: 1876 case Declarator::BlockContext: 1877 case Declarator::ForContext: 1878 case Declarator::ConditionContext: 1879 case Declarator::CXXNewContext: 1880 break; 1881 } 1882 1883 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 1884 Error = 8; 1885 1886 // In Objective-C it is an error to use 'auto' on a function declarator. 1887 if (D.isFunctionDeclarator()) 1888 Error = 10; 1889 1890 // C++11 [dcl.spec.auto]p2: 'auto' is always fine if the declarator 1891 // contains a trailing return type. That is only legal at the outermost 1892 // level. Check all declarator chunks (outermost first) anyway, to give 1893 // better diagnostics. 1894 if (SemaRef.getLangOpts().CPlusPlus0x && Error != -1) { 1895 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 1896 unsigned chunkIndex = e - i - 1; 1897 state.setCurrentChunkIndex(chunkIndex); 1898 DeclaratorChunk &DeclType = D.getTypeObject(chunkIndex); 1899 if (DeclType.Kind == DeclaratorChunk::Function) { 1900 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun; 1901 if (FTI.hasTrailingReturnType()) { 1902 Error = -1; 1903 break; 1904 } 1905 } 1906 } 1907 } 1908 1909 if (Error != -1) { 1910 SemaRef.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 1911 diag::err_auto_not_allowed) 1912 << Error; 1913 T = SemaRef.Context.IntTy; 1914 D.setInvalidType(true); 1915 } else 1916 SemaRef.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 1917 diag::warn_cxx98_compat_auto_type_specifier); 1918 } 1919 1920 if (SemaRef.getLangOpts().CPlusPlus && 1921 OwnedTagDecl && OwnedTagDecl->isCompleteDefinition()) { 1922 // Check the contexts where C++ forbids the declaration of a new class 1923 // or enumeration in a type-specifier-seq. 1924 switch (D.getContext()) { 1925 case Declarator::TrailingReturnContext: 1926 // Class and enumeration definitions are syntactically not allowed in 1927 // trailing return types. 1928 llvm_unreachable("parser should not have allowed this"); 1929 break; 1930 case Declarator::FileContext: 1931 case Declarator::MemberContext: 1932 case Declarator::BlockContext: 1933 case Declarator::ForContext: 1934 case Declarator::BlockLiteralContext: 1935 case Declarator::LambdaExprContext: 1936 // C++11 [dcl.type]p3: 1937 // A type-specifier-seq shall not define a class or enumeration unless 1938 // it appears in the type-id of an alias-declaration (7.1.3) that is not 1939 // the declaration of a template-declaration. 1940 case Declarator::AliasDeclContext: 1941 break; 1942 case Declarator::AliasTemplateContext: 1943 SemaRef.Diag(OwnedTagDecl->getLocation(), 1944 diag::err_type_defined_in_alias_template) 1945 << SemaRef.Context.getTypeDeclType(OwnedTagDecl); 1946 break; 1947 case Declarator::TypeNameContext: 1948 case Declarator::TemplateParamContext: 1949 case Declarator::CXXNewContext: 1950 case Declarator::CXXCatchContext: 1951 case Declarator::ObjCCatchContext: 1952 case Declarator::TemplateTypeArgContext: 1953 SemaRef.Diag(OwnedTagDecl->getLocation(), 1954 diag::err_type_defined_in_type_specifier) 1955 << SemaRef.Context.getTypeDeclType(OwnedTagDecl); 1956 break; 1957 case Declarator::PrototypeContext: 1958 case Declarator::ObjCParameterContext: 1959 case Declarator::ObjCResultContext: 1960 case Declarator::KNRTypeListContext: 1961 // C++ [dcl.fct]p6: 1962 // Types shall not be defined in return or parameter types. 1963 SemaRef.Diag(OwnedTagDecl->getLocation(), 1964 diag::err_type_defined_in_param_type) 1965 << SemaRef.Context.getTypeDeclType(OwnedTagDecl); 1966 break; 1967 case Declarator::ConditionContext: 1968 // C++ 6.4p2: 1969 // The type-specifier-seq shall not contain typedef and shall not declare 1970 // a new class or enumeration. 1971 SemaRef.Diag(OwnedTagDecl->getLocation(), 1972 diag::err_type_defined_in_condition); 1973 break; 1974 } 1975 } 1976 1977 return T; 1978} 1979 1980static std::string getFunctionQualifiersAsString(const FunctionProtoType *FnTy){ 1981 std::string Quals = 1982 Qualifiers::fromCVRMask(FnTy->getTypeQuals()).getAsString(); 1983 1984 switch (FnTy->getRefQualifier()) { 1985 case RQ_None: 1986 break; 1987 1988 case RQ_LValue: 1989 if (!Quals.empty()) 1990 Quals += ' '; 1991 Quals += '&'; 1992 break; 1993 1994 case RQ_RValue: 1995 if (!Quals.empty()) 1996 Quals += ' '; 1997 Quals += "&&"; 1998 break; 1999 } 2000 2001 return Quals; 2002} 2003 2004/// Check that the function type T, which has a cv-qualifier or a ref-qualifier, 2005/// can be contained within the declarator chunk DeclType, and produce an 2006/// appropriate diagnostic if not. 2007static void checkQualifiedFunction(Sema &S, QualType T, 2008 DeclaratorChunk &DeclType) { 2009 // C++98 [dcl.fct]p4 / C++11 [dcl.fct]p6: a function type with a 2010 // cv-qualifier or a ref-qualifier can only appear at the topmost level 2011 // of a type. 2012 int DiagKind = -1; 2013 switch (DeclType.Kind) { 2014 case DeclaratorChunk::Paren: 2015 case DeclaratorChunk::MemberPointer: 2016 // These cases are permitted. 2017 return; 2018 case DeclaratorChunk::Array: 2019 case DeclaratorChunk::Function: 2020 // These cases don't allow function types at all; no need to diagnose the 2021 // qualifiers separately. 2022 return; 2023 case DeclaratorChunk::BlockPointer: 2024 DiagKind = 0; 2025 break; 2026 case DeclaratorChunk::Pointer: 2027 DiagKind = 1; 2028 break; 2029 case DeclaratorChunk::Reference: 2030 DiagKind = 2; 2031 break; 2032 } 2033 2034 assert(DiagKind != -1); 2035 S.Diag(DeclType.Loc, diag::err_compound_qualified_function_type) 2036 << DiagKind << isa<FunctionType>(T.IgnoreParens()) << T 2037 << getFunctionQualifiersAsString(T->castAs<FunctionProtoType>()); 2038} 2039 2040static TypeSourceInfo *GetFullTypeForDeclarator(TypeProcessingState &state, 2041 QualType declSpecType, 2042 TypeSourceInfo *TInfo) { 2043 2044 QualType T = declSpecType; 2045 Declarator &D = state.getDeclarator(); 2046 Sema &S = state.getSema(); 2047 ASTContext &Context = S.Context; 2048 const LangOptions &LangOpts = S.getLangOpts(); 2049 2050 bool ImplicitlyNoexcept = false; 2051 if (D.getName().getKind() == UnqualifiedId::IK_OperatorFunctionId && 2052 LangOpts.CPlusPlus0x) { 2053 OverloadedOperatorKind OO = D.getName().OperatorFunctionId.Operator; 2054 /// In C++0x, deallocation functions (normal and array operator delete) 2055 /// are implicitly noexcept. 2056 if (OO == OO_Delete || OO == OO_Array_Delete) 2057 ImplicitlyNoexcept = true; 2058 } 2059 2060 // The name we're declaring, if any. 2061 DeclarationName Name; 2062 if (D.getIdentifier()) 2063 Name = D.getIdentifier(); 2064 2065 // Does this declaration declare a typedef-name? 2066 bool IsTypedefName = 2067 D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef || 2068 D.getContext() == Declarator::AliasDeclContext || 2069 D.getContext() == Declarator::AliasTemplateContext; 2070 2071 // Does T refer to a function type with a cv-qualifier or a ref-qualifier? 2072 bool IsQualifiedFunction = T->isFunctionProtoType() && 2073 (T->castAs<FunctionProtoType>()->getTypeQuals() != 0 || 2074 T->castAs<FunctionProtoType>()->getRefQualifier() != RQ_None); 2075 2076 // Walk the DeclTypeInfo, building the recursive type as we go. 2077 // DeclTypeInfos are ordered from the identifier out, which is 2078 // opposite of what we want :). 2079 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 2080 unsigned chunkIndex = e - i - 1; 2081 state.setCurrentChunkIndex(chunkIndex); 2082 DeclaratorChunk &DeclType = D.getTypeObject(chunkIndex); 2083 if (IsQualifiedFunction) { 2084 checkQualifiedFunction(S, T, DeclType); 2085 IsQualifiedFunction = DeclType.Kind == DeclaratorChunk::Paren; 2086 } 2087 switch (DeclType.Kind) { 2088 case DeclaratorChunk::Paren: 2089 T = S.BuildParenType(T); 2090 break; 2091 case DeclaratorChunk::BlockPointer: 2092 // If blocks are disabled, emit an error. 2093 if (!LangOpts.Blocks) 2094 S.Diag(DeclType.Loc, diag::err_blocks_disable); 2095 2096 T = S.BuildBlockPointerType(T, D.getIdentifierLoc(), Name); 2097 if (DeclType.Cls.TypeQuals) 2098 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Cls.TypeQuals); 2099 break; 2100 case DeclaratorChunk::Pointer: 2101 // Verify that we're not building a pointer to pointer to function with 2102 // exception specification. 2103 if (LangOpts.CPlusPlus && S.CheckDistantExceptionSpec(T)) { 2104 S.Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 2105 D.setInvalidType(true); 2106 // Build the type anyway. 2107 } 2108 if (LangOpts.ObjC1 && T->getAs<ObjCObjectType>()) { 2109 T = Context.getObjCObjectPointerType(T); 2110 if (DeclType.Ptr.TypeQuals) 2111 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Ptr.TypeQuals); 2112 break; 2113 } 2114 T = S.BuildPointerType(T, DeclType.Loc, Name); 2115 if (DeclType.Ptr.TypeQuals) 2116 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Ptr.TypeQuals); 2117 2118 break; 2119 case DeclaratorChunk::Reference: { 2120 // Verify that we're not building a reference to pointer to function with 2121 // exception specification. 2122 if (LangOpts.CPlusPlus && S.CheckDistantExceptionSpec(T)) { 2123 S.Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 2124 D.setInvalidType(true); 2125 // Build the type anyway. 2126 } 2127 T = S.BuildReferenceType(T, DeclType.Ref.LValueRef, DeclType.Loc, Name); 2128 2129 Qualifiers Quals; 2130 if (DeclType.Ref.HasRestrict) 2131 T = S.BuildQualifiedType(T, DeclType.Loc, Qualifiers::Restrict); 2132 break; 2133 } 2134 case DeclaratorChunk::Array: { 2135 // Verify that we're not building an array of pointers to function with 2136 // exception specification. 2137 if (LangOpts.CPlusPlus && S.CheckDistantExceptionSpec(T)) { 2138 S.Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 2139 D.setInvalidType(true); 2140 // Build the type anyway. 2141 } 2142 DeclaratorChunk::ArrayTypeInfo &ATI = DeclType.Arr; 2143 Expr *ArraySize = static_cast<Expr*>(ATI.NumElts); 2144 ArrayType::ArraySizeModifier ASM; 2145 if (ATI.isStar) 2146 ASM = ArrayType::Star; 2147 else if (ATI.hasStatic) 2148 ASM = ArrayType::Static; 2149 else 2150 ASM = ArrayType::Normal; 2151 if (ASM == ArrayType::Star && !D.isPrototypeContext()) { 2152 // FIXME: This check isn't quite right: it allows star in prototypes 2153 // for function definitions, and disallows some edge cases detailed 2154 // in http://gcc.gnu.org/ml/gcc-patches/2009-02/msg00133.html 2155 S.Diag(DeclType.Loc, diag::err_array_star_outside_prototype); 2156 ASM = ArrayType::Normal; 2157 D.setInvalidType(true); 2158 } 2159 T = S.BuildArrayType(T, ASM, ArraySize, ATI.TypeQuals, 2160 SourceRange(DeclType.Loc, DeclType.EndLoc), Name); 2161 break; 2162 } 2163 case DeclaratorChunk::Function: { 2164 // If the function declarator has a prototype (i.e. it is not () and 2165 // does not have a K&R-style identifier list), then the arguments are part 2166 // of the type, otherwise the argument list is (). 2167 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun; 2168 IsQualifiedFunction = FTI.TypeQuals || FTI.hasRefQualifier(); 2169 2170 // Check for auto functions and trailing return type and adjust the 2171 // return type accordingly. 2172 if (!D.isInvalidType()) { 2173 // trailing-return-type is only required if we're declaring a function, 2174 // and not, for instance, a pointer to a function. 2175 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto && 2176 !FTI.hasTrailingReturnType() && chunkIndex == 0) { 2177 S.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 2178 diag::err_auto_missing_trailing_return); 2179 T = Context.IntTy; 2180 D.setInvalidType(true); 2181 } else if (FTI.hasTrailingReturnType()) { 2182 // T must be exactly 'auto' at this point. See CWG issue 681. 2183 if (isa<ParenType>(T)) { 2184 S.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 2185 diag::err_trailing_return_in_parens) 2186 << T << D.getDeclSpec().getSourceRange(); 2187 D.setInvalidType(true); 2188 } else if (D.getContext() != Declarator::LambdaExprContext && 2189 (T.hasQualifiers() || !isa<AutoType>(T))) { 2190 S.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 2191 diag::err_trailing_return_without_auto) 2192 << T << D.getDeclSpec().getSourceRange(); 2193 D.setInvalidType(true); 2194 } 2195 T = S.GetTypeFromParser(FTI.getTrailingReturnType(), &TInfo); 2196 if (T.isNull()) { 2197 // An error occurred parsing the trailing return type. 2198 T = Context.IntTy; 2199 D.setInvalidType(true); 2200 } 2201 } 2202 } 2203 2204 // C99 6.7.5.3p1: The return type may not be a function or array type. 2205 // For conversion functions, we'll diagnose this particular error later. 2206 if ((T->isArrayType() || T->isFunctionType()) && 2207 (D.getName().getKind() != UnqualifiedId::IK_ConversionFunctionId)) { 2208 unsigned diagID = diag::err_func_returning_array_function; 2209 // Last processing chunk in block context means this function chunk 2210 // represents the block. 2211 if (chunkIndex == 0 && 2212 D.getContext() == Declarator::BlockLiteralContext) 2213 diagID = diag::err_block_returning_array_function; 2214 S.Diag(DeclType.Loc, diagID) << T->isFunctionType() << T; 2215 T = Context.IntTy; 2216 D.setInvalidType(true); 2217 } 2218 2219 // Do not allow returning half FP value. 2220 // FIXME: This really should be in BuildFunctionType. 2221 if (T->isHalfType()) { 2222 S.Diag(D.getIdentifierLoc(), 2223 diag::err_parameters_retval_cannot_have_fp16_type) << 1 2224 << FixItHint::CreateInsertion(D.getIdentifierLoc(), "*"); 2225 D.setInvalidType(true); 2226 } 2227 2228 // cv-qualifiers on return types are pointless except when the type is a 2229 // class type in C++. 2230 if (isa<PointerType>(T) && T.getLocalCVRQualifiers() && 2231 (D.getName().getKind() != UnqualifiedId::IK_ConversionFunctionId) && 2232 (!LangOpts.CPlusPlus || !T->isDependentType())) { 2233 assert(chunkIndex + 1 < e && "No DeclaratorChunk for the return type?"); 2234 DeclaratorChunk ReturnTypeChunk = D.getTypeObject(chunkIndex + 1); 2235 assert(ReturnTypeChunk.Kind == DeclaratorChunk::Pointer); 2236 2237 DeclaratorChunk::PointerTypeInfo &PTI = ReturnTypeChunk.Ptr; 2238 2239 DiagnoseIgnoredQualifiers(PTI.TypeQuals, 2240 SourceLocation::getFromRawEncoding(PTI.ConstQualLoc), 2241 SourceLocation::getFromRawEncoding(PTI.VolatileQualLoc), 2242 SourceLocation::getFromRawEncoding(PTI.RestrictQualLoc), 2243 S); 2244 2245 } else if (T.getCVRQualifiers() && D.getDeclSpec().getTypeQualifiers() && 2246 (!LangOpts.CPlusPlus || 2247 (!T->isDependentType() && !T->isRecordType()))) { 2248 2249 DiagnoseIgnoredQualifiers(D.getDeclSpec().getTypeQualifiers(), 2250 D.getDeclSpec().getConstSpecLoc(), 2251 D.getDeclSpec().getVolatileSpecLoc(), 2252 D.getDeclSpec().getRestrictSpecLoc(), 2253 S); 2254 } 2255 2256 if (LangOpts.CPlusPlus && D.getDeclSpec().isTypeSpecOwned()) { 2257 // C++ [dcl.fct]p6: 2258 // Types shall not be defined in return or parameter types. 2259 TagDecl *Tag = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 2260 if (Tag->isCompleteDefinition()) 2261 S.Diag(Tag->getLocation(), diag::err_type_defined_in_result_type) 2262 << Context.getTypeDeclType(Tag); 2263 } 2264 2265 // Exception specs are not allowed in typedefs. Complain, but add it 2266 // anyway. 2267 if (IsTypedefName && FTI.getExceptionSpecType()) 2268 S.Diag(FTI.getExceptionSpecLoc(), diag::err_exception_spec_in_typedef) 2269 << (D.getContext() == Declarator::AliasDeclContext || 2270 D.getContext() == Declarator::AliasTemplateContext); 2271 2272 if (!FTI.NumArgs && !FTI.isVariadic && !LangOpts.CPlusPlus) { 2273 // Simple void foo(), where the incoming T is the result type. 2274 T = Context.getFunctionNoProtoType(T); 2275 } else { 2276 // We allow a zero-parameter variadic function in C if the 2277 // function is marked with the "overloadable" attribute. Scan 2278 // for this attribute now. 2279 if (!FTI.NumArgs && FTI.isVariadic && !LangOpts.CPlusPlus) { 2280 bool Overloadable = false; 2281 for (const AttributeList *Attrs = D.getAttributes(); 2282 Attrs; Attrs = Attrs->getNext()) { 2283 if (Attrs->getKind() == AttributeList::AT_Overloadable) { 2284 Overloadable = true; 2285 break; 2286 } 2287 } 2288 2289 if (!Overloadable) 2290 S.Diag(FTI.getEllipsisLoc(), diag::err_ellipsis_first_arg); 2291 } 2292 2293 if (FTI.NumArgs && FTI.ArgInfo[0].Param == 0) { 2294 // C99 6.7.5.3p3: Reject int(x,y,z) when it's not a function 2295 // definition. 2296 S.Diag(FTI.ArgInfo[0].IdentLoc, diag::err_ident_list_in_fn_declaration); 2297 D.setInvalidType(true); 2298 break; 2299 } 2300 2301 FunctionProtoType::ExtProtoInfo EPI; 2302 EPI.Variadic = FTI.isVariadic; 2303 EPI.HasTrailingReturn = FTI.hasTrailingReturnType(); 2304 EPI.TypeQuals = FTI.TypeQuals; 2305 EPI.RefQualifier = !FTI.hasRefQualifier()? RQ_None 2306 : FTI.RefQualifierIsLValueRef? RQ_LValue 2307 : RQ_RValue; 2308 2309 // Otherwise, we have a function with an argument list that is 2310 // potentially variadic. 2311 SmallVector<QualType, 16> ArgTys; 2312 ArgTys.reserve(FTI.NumArgs); 2313 2314 SmallVector<bool, 16> ConsumedArguments; 2315 ConsumedArguments.reserve(FTI.NumArgs); 2316 bool HasAnyConsumedArguments = false; 2317 2318 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 2319 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 2320 QualType ArgTy = Param->getType(); 2321 assert(!ArgTy.isNull() && "Couldn't parse type?"); 2322 2323 // Adjust the parameter type. 2324 assert((ArgTy == Context.getAdjustedParameterType(ArgTy)) && 2325 "Unadjusted type?"); 2326 2327 // Look for 'void'. void is allowed only as a single argument to a 2328 // function with no other parameters (C99 6.7.5.3p10). We record 2329 // int(void) as a FunctionProtoType with an empty argument list. 2330 if (ArgTy->isVoidType()) { 2331 // If this is something like 'float(int, void)', reject it. 'void' 2332 // is an incomplete type (C99 6.2.5p19) and function decls cannot 2333 // have arguments of incomplete type. 2334 if (FTI.NumArgs != 1 || FTI.isVariadic) { 2335 S.Diag(DeclType.Loc, diag::err_void_only_param); 2336 ArgTy = Context.IntTy; 2337 Param->setType(ArgTy); 2338 } else if (FTI.ArgInfo[i].Ident) { 2339 // Reject, but continue to parse 'int(void abc)'. 2340 S.Diag(FTI.ArgInfo[i].IdentLoc, 2341 diag::err_param_with_void_type); 2342 ArgTy = Context.IntTy; 2343 Param->setType(ArgTy); 2344 } else { 2345 // Reject, but continue to parse 'float(const void)'. 2346 if (ArgTy.hasQualifiers()) 2347 S.Diag(DeclType.Loc, diag::err_void_param_qualified); 2348 2349 // Do not add 'void' to the ArgTys list. 2350 break; 2351 } 2352 } else if (ArgTy->isHalfType()) { 2353 // Disallow half FP arguments. 2354 // FIXME: This really should be in BuildFunctionType. 2355 S.Diag(Param->getLocation(), 2356 diag::err_parameters_retval_cannot_have_fp16_type) << 0 2357 << FixItHint::CreateInsertion(Param->getLocation(), "*"); 2358 D.setInvalidType(); 2359 } else if (!FTI.hasPrototype) { 2360 if (ArgTy->isPromotableIntegerType()) { 2361 ArgTy = Context.getPromotedIntegerType(ArgTy); 2362 Param->setKNRPromoted(true); 2363 } else if (const BuiltinType* BTy = ArgTy->getAs<BuiltinType>()) { 2364 if (BTy->getKind() == BuiltinType::Float) { 2365 ArgTy = Context.DoubleTy; 2366 Param->setKNRPromoted(true); 2367 } 2368 } 2369 } 2370 2371 if (LangOpts.ObjCAutoRefCount) { 2372 bool Consumed = Param->hasAttr<NSConsumedAttr>(); 2373 ConsumedArguments.push_back(Consumed); 2374 HasAnyConsumedArguments |= Consumed; 2375 } 2376 2377 ArgTys.push_back(ArgTy); 2378 } 2379 2380 if (HasAnyConsumedArguments) 2381 EPI.ConsumedArguments = ConsumedArguments.data(); 2382 2383 SmallVector<QualType, 4> Exceptions; 2384 SmallVector<ParsedType, 2> DynamicExceptions; 2385 SmallVector<SourceRange, 2> DynamicExceptionRanges; 2386 Expr *NoexceptExpr = 0; 2387 2388 if (FTI.getExceptionSpecType() == EST_Dynamic) { 2389 // FIXME: It's rather inefficient to have to split into two vectors 2390 // here. 2391 unsigned N = FTI.NumExceptions; 2392 DynamicExceptions.reserve(N); 2393 DynamicExceptionRanges.reserve(N); 2394 for (unsigned I = 0; I != N; ++I) { 2395 DynamicExceptions.push_back(FTI.Exceptions[I].Ty); 2396 DynamicExceptionRanges.push_back(FTI.Exceptions[I].Range); 2397 } 2398 } else if (FTI.getExceptionSpecType() == EST_ComputedNoexcept) { 2399 NoexceptExpr = FTI.NoexceptExpr; 2400 } 2401 2402 S.checkExceptionSpecification(FTI.getExceptionSpecType(), 2403 DynamicExceptions, 2404 DynamicExceptionRanges, 2405 NoexceptExpr, 2406 Exceptions, 2407 EPI); 2408 2409 if (FTI.getExceptionSpecType() == EST_None && 2410 ImplicitlyNoexcept && chunkIndex == 0) { 2411 // Only the outermost chunk is marked noexcept, of course. 2412 EPI.ExceptionSpecType = EST_BasicNoexcept; 2413 } 2414 2415 T = Context.getFunctionType(T, ArgTys.data(), ArgTys.size(), EPI); 2416 } 2417 2418 break; 2419 } 2420 case DeclaratorChunk::MemberPointer: 2421 // The scope spec must refer to a class, or be dependent. 2422 CXXScopeSpec &SS = DeclType.Mem.Scope(); 2423 QualType ClsType; 2424 if (SS.isInvalid()) { 2425 // Avoid emitting extra errors if we already errored on the scope. 2426 D.setInvalidType(true); 2427 } else if (S.isDependentScopeSpecifier(SS) || 2428 dyn_cast_or_null<CXXRecordDecl>(S.computeDeclContext(SS))) { 2429 NestedNameSpecifier *NNS 2430 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 2431 NestedNameSpecifier *NNSPrefix = NNS->getPrefix(); 2432 switch (NNS->getKind()) { 2433 case NestedNameSpecifier::Identifier: 2434 ClsType = Context.getDependentNameType(ETK_None, NNSPrefix, 2435 NNS->getAsIdentifier()); 2436 break; 2437 2438 case NestedNameSpecifier::Namespace: 2439 case NestedNameSpecifier::NamespaceAlias: 2440 case NestedNameSpecifier::Global: 2441 llvm_unreachable("Nested-name-specifier must name a type"); 2442 2443 case NestedNameSpecifier::TypeSpec: 2444 case NestedNameSpecifier::TypeSpecWithTemplate: 2445 ClsType = QualType(NNS->getAsType(), 0); 2446 // Note: if the NNS has a prefix and ClsType is a nondependent 2447 // TemplateSpecializationType, then the NNS prefix is NOT included 2448 // in ClsType; hence we wrap ClsType into an ElaboratedType. 2449 // NOTE: in particular, no wrap occurs if ClsType already is an 2450 // Elaborated, DependentName, or DependentTemplateSpecialization. 2451 if (NNSPrefix && isa<TemplateSpecializationType>(NNS->getAsType())) 2452 ClsType = Context.getElaboratedType(ETK_None, NNSPrefix, ClsType); 2453 break; 2454 } 2455 } else { 2456 S.Diag(DeclType.Mem.Scope().getBeginLoc(), 2457 diag::err_illegal_decl_mempointer_in_nonclass) 2458 << (D.getIdentifier() ? D.getIdentifier()->getName() : "type name") 2459 << DeclType.Mem.Scope().getRange(); 2460 D.setInvalidType(true); 2461 } 2462 2463 if (!ClsType.isNull()) 2464 T = S.BuildMemberPointerType(T, ClsType, DeclType.Loc, D.getIdentifier()); 2465 if (T.isNull()) { 2466 T = Context.IntTy; 2467 D.setInvalidType(true); 2468 } else if (DeclType.Mem.TypeQuals) { 2469 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Mem.TypeQuals); 2470 } 2471 break; 2472 } 2473 2474 if (T.isNull()) { 2475 D.setInvalidType(true); 2476 T = Context.IntTy; 2477 } 2478 2479 // See if there are any attributes on this declarator chunk. 2480 if (AttributeList *attrs = const_cast<AttributeList*>(DeclType.getAttrs())) 2481 processTypeAttrs(state, T, false, attrs); 2482 } 2483 2484 if (LangOpts.CPlusPlus && T->isFunctionType()) { 2485 const FunctionProtoType *FnTy = T->getAs<FunctionProtoType>(); 2486 assert(FnTy && "Why oh why is there not a FunctionProtoType here?"); 2487 2488 // C++ 8.3.5p4: 2489 // A cv-qualifier-seq shall only be part of the function type 2490 // for a nonstatic member function, the function type to which a pointer 2491 // to member refers, or the top-level function type of a function typedef 2492 // declaration. 2493 // 2494 // Core issue 547 also allows cv-qualifiers on function types that are 2495 // top-level template type arguments. 2496 bool FreeFunction; 2497 if (!D.getCXXScopeSpec().isSet()) { 2498 FreeFunction = ((D.getContext() != Declarator::MemberContext && 2499 D.getContext() != Declarator::LambdaExprContext) || 2500 D.getDeclSpec().isFriendSpecified()); 2501 } else { 2502 DeclContext *DC = S.computeDeclContext(D.getCXXScopeSpec()); 2503 FreeFunction = (DC && !DC->isRecord()); 2504 } 2505 2506 // C++0x [dcl.constexpr]p8: A constexpr specifier for a non-static member 2507 // function that is not a constructor declares that function to be const. 2508 if (D.getDeclSpec().isConstexprSpecified() && !FreeFunction && 2509 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static && 2510 D.getName().getKind() != UnqualifiedId::IK_ConstructorName && 2511 D.getName().getKind() != UnqualifiedId::IK_ConstructorTemplateId && 2512 !(FnTy->getTypeQuals() & DeclSpec::TQ_const)) { 2513 // Rebuild function type adding a 'const' qualifier. 2514 FunctionProtoType::ExtProtoInfo EPI = FnTy->getExtProtoInfo(); 2515 EPI.TypeQuals |= DeclSpec::TQ_const; 2516 T = Context.getFunctionType(FnTy->getResultType(), 2517 FnTy->arg_type_begin(), 2518 FnTy->getNumArgs(), EPI); 2519 } 2520 2521 // C++11 [dcl.fct]p6 (w/DR1417): 2522 // An attempt to specify a function type with a cv-qualifier-seq or a 2523 // ref-qualifier (including by typedef-name) is ill-formed unless it is: 2524 // - the function type for a non-static member function, 2525 // - the function type to which a pointer to member refers, 2526 // - the top-level function type of a function typedef declaration or 2527 // alias-declaration, 2528 // - the type-id in the default argument of a type-parameter, or 2529 // - the type-id of a template-argument for a type-parameter 2530 if (IsQualifiedFunction && 2531 !(!FreeFunction && 2532 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) && 2533 !IsTypedefName && 2534 D.getContext() != Declarator::TemplateTypeArgContext) { 2535 SourceLocation Loc = D.getLocStart(); 2536 SourceRange RemovalRange; 2537 unsigned I; 2538 if (D.isFunctionDeclarator(I)) { 2539 SmallVector<SourceLocation, 4> RemovalLocs; 2540 const DeclaratorChunk &Chunk = D.getTypeObject(I); 2541 assert(Chunk.Kind == DeclaratorChunk::Function); 2542 if (Chunk.Fun.hasRefQualifier()) 2543 RemovalLocs.push_back(Chunk.Fun.getRefQualifierLoc()); 2544 if (Chunk.Fun.TypeQuals & Qualifiers::Const) 2545 RemovalLocs.push_back(Chunk.Fun.getConstQualifierLoc()); 2546 if (Chunk.Fun.TypeQuals & Qualifiers::Volatile) 2547 RemovalLocs.push_back(Chunk.Fun.getVolatileQualifierLoc()); 2548 // FIXME: We do not track the location of the __restrict qualifier. 2549 //if (Chunk.Fun.TypeQuals & Qualifiers::Restrict) 2550 // RemovalLocs.push_back(Chunk.Fun.getRestrictQualifierLoc()); 2551 if (!RemovalLocs.empty()) { 2552 std::sort(RemovalLocs.begin(), RemovalLocs.end(), 2553 BeforeThanCompare<SourceLocation>(S.getSourceManager())); 2554 RemovalRange = SourceRange(RemovalLocs.front(), RemovalLocs.back()); 2555 Loc = RemovalLocs.front(); 2556 } 2557 } 2558 2559 S.Diag(Loc, diag::err_invalid_qualified_function_type) 2560 << FreeFunction << D.isFunctionDeclarator() << T 2561 << getFunctionQualifiersAsString(FnTy) 2562 << FixItHint::CreateRemoval(RemovalRange); 2563 2564 // Strip the cv-qualifiers and ref-qualifiers from the type. 2565 FunctionProtoType::ExtProtoInfo EPI = FnTy->getExtProtoInfo(); 2566 EPI.TypeQuals = 0; 2567 EPI.RefQualifier = RQ_None; 2568 2569 T = Context.getFunctionType(FnTy->getResultType(), 2570 FnTy->arg_type_begin(), 2571 FnTy->getNumArgs(), EPI); 2572 } 2573 } 2574 2575 // Apply any undistributed attributes from the declarator. 2576 if (!T.isNull()) 2577 if (AttributeList *attrs = D.getAttributes()) 2578 processTypeAttrs(state, T, false, attrs); 2579 2580 // Diagnose any ignored type attributes. 2581 if (!T.isNull()) state.diagnoseIgnoredTypeAttrs(T); 2582 2583 // C++0x [dcl.constexpr]p9: 2584 // A constexpr specifier used in an object declaration declares the object 2585 // as const. 2586 if (D.getDeclSpec().isConstexprSpecified() && T->isObjectType()) { 2587 T.addConst(); 2588 } 2589 2590 // If there was an ellipsis in the declarator, the declaration declares a 2591 // parameter pack whose type may be a pack expansion type. 2592 if (D.hasEllipsis() && !T.isNull()) { 2593 // C++0x [dcl.fct]p13: 2594 // A declarator-id or abstract-declarator containing an ellipsis shall 2595 // only be used in a parameter-declaration. Such a parameter-declaration 2596 // is a parameter pack (14.5.3). [...] 2597 switch (D.getContext()) { 2598 case Declarator::PrototypeContext: 2599 // C++0x [dcl.fct]p13: 2600 // [...] When it is part of a parameter-declaration-clause, the 2601 // parameter pack is a function parameter pack (14.5.3). The type T 2602 // of the declarator-id of the function parameter pack shall contain 2603 // a template parameter pack; each template parameter pack in T is 2604 // expanded by the function parameter pack. 2605 // 2606 // We represent function parameter packs as function parameters whose 2607 // type is a pack expansion. 2608 if (!T->containsUnexpandedParameterPack()) { 2609 S.Diag(D.getEllipsisLoc(), 2610 diag::err_function_parameter_pack_without_parameter_packs) 2611 << T << D.getSourceRange(); 2612 D.setEllipsisLoc(SourceLocation()); 2613 } else { 2614 T = Context.getPackExpansionType(T, llvm::Optional<unsigned>()); 2615 } 2616 break; 2617 2618 case Declarator::TemplateParamContext: 2619 // C++0x [temp.param]p15: 2620 // If a template-parameter is a [...] is a parameter-declaration that 2621 // declares a parameter pack (8.3.5), then the template-parameter is a 2622 // template parameter pack (14.5.3). 2623 // 2624 // Note: core issue 778 clarifies that, if there are any unexpanded 2625 // parameter packs in the type of the non-type template parameter, then 2626 // it expands those parameter packs. 2627 if (T->containsUnexpandedParameterPack()) 2628 T = Context.getPackExpansionType(T, llvm::Optional<unsigned>()); 2629 else 2630 S.Diag(D.getEllipsisLoc(), 2631 LangOpts.CPlusPlus0x 2632 ? diag::warn_cxx98_compat_variadic_templates 2633 : diag::ext_variadic_templates); 2634 break; 2635 2636 case Declarator::FileContext: 2637 case Declarator::KNRTypeListContext: 2638 case Declarator::ObjCParameterContext: // FIXME: special diagnostic here? 2639 case Declarator::ObjCResultContext: // FIXME: special diagnostic here? 2640 case Declarator::TypeNameContext: 2641 case Declarator::CXXNewContext: 2642 case Declarator::AliasDeclContext: 2643 case Declarator::AliasTemplateContext: 2644 case Declarator::MemberContext: 2645 case Declarator::BlockContext: 2646 case Declarator::ForContext: 2647 case Declarator::ConditionContext: 2648 case Declarator::CXXCatchContext: 2649 case Declarator::ObjCCatchContext: 2650 case Declarator::BlockLiteralContext: 2651 case Declarator::LambdaExprContext: 2652 case Declarator::TrailingReturnContext: 2653 case Declarator::TemplateTypeArgContext: 2654 // FIXME: We may want to allow parameter packs in block-literal contexts 2655 // in the future. 2656 S.Diag(D.getEllipsisLoc(), diag::err_ellipsis_in_declarator_not_parameter); 2657 D.setEllipsisLoc(SourceLocation()); 2658 break; 2659 } 2660 } 2661 2662 if (T.isNull()) 2663 return Context.getNullTypeSourceInfo(); 2664 else if (D.isInvalidType()) 2665 return Context.getTrivialTypeSourceInfo(T); 2666 2667 return S.GetTypeSourceInfoForDeclarator(D, T, TInfo); 2668} 2669 2670/// GetTypeForDeclarator - Convert the type for the specified 2671/// declarator to Type instances. 2672/// 2673/// The result of this call will never be null, but the associated 2674/// type may be a null type if there's an unrecoverable error. 2675TypeSourceInfo *Sema::GetTypeForDeclarator(Declarator &D, Scope *S) { 2676 // Determine the type of the declarator. Not all forms of declarator 2677 // have a type. 2678 2679 TypeProcessingState state(*this, D); 2680 2681 TypeSourceInfo *ReturnTypeInfo = 0; 2682 QualType T = GetDeclSpecTypeForDeclarator(state, ReturnTypeInfo); 2683 if (T.isNull()) 2684 return Context.getNullTypeSourceInfo(); 2685 2686 if (D.isPrototypeContext() && getLangOpts().ObjCAutoRefCount) 2687 inferARCWriteback(state, T); 2688 2689 return GetFullTypeForDeclarator(state, T, ReturnTypeInfo); 2690} 2691 2692static void transferARCOwnershipToDeclSpec(Sema &S, 2693 QualType &declSpecTy, 2694 Qualifiers::ObjCLifetime ownership) { 2695 if (declSpecTy->isObjCRetainableType() && 2696 declSpecTy.getObjCLifetime() == Qualifiers::OCL_None) { 2697 Qualifiers qs; 2698 qs.addObjCLifetime(ownership); 2699 declSpecTy = S.Context.getQualifiedType(declSpecTy, qs); 2700 } 2701} 2702 2703static void transferARCOwnershipToDeclaratorChunk(TypeProcessingState &state, 2704 Qualifiers::ObjCLifetime ownership, 2705 unsigned chunkIndex) { 2706 Sema &S = state.getSema(); 2707 Declarator &D = state.getDeclarator(); 2708 2709 // Look for an explicit lifetime attribute. 2710 DeclaratorChunk &chunk = D.getTypeObject(chunkIndex); 2711 for (const AttributeList *attr = chunk.getAttrs(); attr; 2712 attr = attr->getNext()) 2713 if (attr->getKind() == AttributeList::AT_ObjCOwnership) 2714 return; 2715 2716 const char *attrStr = 0; 2717 switch (ownership) { 2718 case Qualifiers::OCL_None: llvm_unreachable("no ownership!"); 2719 case Qualifiers::OCL_ExplicitNone: attrStr = "none"; break; 2720 case Qualifiers::OCL_Strong: attrStr = "strong"; break; 2721 case Qualifiers::OCL_Weak: attrStr = "weak"; break; 2722 case Qualifiers::OCL_Autoreleasing: attrStr = "autoreleasing"; break; 2723 } 2724 2725 // If there wasn't one, add one (with an invalid source location 2726 // so that we don't make an AttributedType for it). 2727 AttributeList *attr = D.getAttributePool() 2728 .create(&S.Context.Idents.get("objc_ownership"), SourceLocation(), 2729 /*scope*/ 0, SourceLocation(), 2730 &S.Context.Idents.get(attrStr), SourceLocation(), 2731 /*args*/ 0, 0, AttributeList::AS_GNU); 2732 spliceAttrIntoList(*attr, chunk.getAttrListRef()); 2733 2734 // TODO: mark whether we did this inference? 2735} 2736 2737/// \brief Used for transferring ownership in casts resulting in l-values. 2738static void transferARCOwnership(TypeProcessingState &state, 2739 QualType &declSpecTy, 2740 Qualifiers::ObjCLifetime ownership) { 2741 Sema &S = state.getSema(); 2742 Declarator &D = state.getDeclarator(); 2743 2744 int inner = -1; 2745 bool hasIndirection = false; 2746 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 2747 DeclaratorChunk &chunk = D.getTypeObject(i); 2748 switch (chunk.Kind) { 2749 case DeclaratorChunk::Paren: 2750 // Ignore parens. 2751 break; 2752 2753 case DeclaratorChunk::Array: 2754 case DeclaratorChunk::Reference: 2755 case DeclaratorChunk::Pointer: 2756 if (inner != -1) 2757 hasIndirection = true; 2758 inner = i; 2759 break; 2760 2761 case DeclaratorChunk::BlockPointer: 2762 if (inner != -1) 2763 transferARCOwnershipToDeclaratorChunk(state, ownership, i); 2764 return; 2765 2766 case DeclaratorChunk::Function: 2767 case DeclaratorChunk::MemberPointer: 2768 return; 2769 } 2770 } 2771 2772 if (inner == -1) 2773 return; 2774 2775 DeclaratorChunk &chunk = D.getTypeObject(inner); 2776 if (chunk.Kind == DeclaratorChunk::Pointer) { 2777 if (declSpecTy->isObjCRetainableType()) 2778 return transferARCOwnershipToDeclSpec(S, declSpecTy, ownership); 2779 if (declSpecTy->isObjCObjectType() && hasIndirection) 2780 return transferARCOwnershipToDeclaratorChunk(state, ownership, inner); 2781 } else { 2782 assert(chunk.Kind == DeclaratorChunk::Array || 2783 chunk.Kind == DeclaratorChunk::Reference); 2784 return transferARCOwnershipToDeclSpec(S, declSpecTy, ownership); 2785 } 2786} 2787 2788TypeSourceInfo *Sema::GetTypeForDeclaratorCast(Declarator &D, QualType FromTy) { 2789 TypeProcessingState state(*this, D); 2790 2791 TypeSourceInfo *ReturnTypeInfo = 0; 2792 QualType declSpecTy = GetDeclSpecTypeForDeclarator(state, ReturnTypeInfo); 2793 if (declSpecTy.isNull()) 2794 return Context.getNullTypeSourceInfo(); 2795 2796 if (getLangOpts().ObjCAutoRefCount) { 2797 Qualifiers::ObjCLifetime ownership = Context.getInnerObjCOwnership(FromTy); 2798 if (ownership != Qualifiers::OCL_None) 2799 transferARCOwnership(state, declSpecTy, ownership); 2800 } 2801 2802 return GetFullTypeForDeclarator(state, declSpecTy, ReturnTypeInfo); 2803} 2804 2805/// Map an AttributedType::Kind to an AttributeList::Kind. 2806static AttributeList::Kind getAttrListKind(AttributedType::Kind kind) { 2807 switch (kind) { 2808 case AttributedType::attr_address_space: 2809 return AttributeList::AT_AddressSpace; 2810 case AttributedType::attr_regparm: 2811 return AttributeList::AT_Regparm; 2812 case AttributedType::attr_vector_size: 2813 return AttributeList::AT_VectorSize; 2814 case AttributedType::attr_neon_vector_type: 2815 return AttributeList::AT_NeonVectorType; 2816 case AttributedType::attr_neon_polyvector_type: 2817 return AttributeList::AT_NeonPolyVectorType; 2818 case AttributedType::attr_objc_gc: 2819 return AttributeList::AT_ObjCGC; 2820 case AttributedType::attr_objc_ownership: 2821 return AttributeList::AT_ObjCOwnership; 2822 case AttributedType::attr_noreturn: 2823 return AttributeList::AT_NoReturn; 2824 case AttributedType::attr_cdecl: 2825 return AttributeList::AT_CDecl; 2826 case AttributedType::attr_fastcall: 2827 return AttributeList::AT_FastCall; 2828 case AttributedType::attr_stdcall: 2829 return AttributeList::AT_StdCall; 2830 case AttributedType::attr_thiscall: 2831 return AttributeList::AT_ThisCall; 2832 case AttributedType::attr_pascal: 2833 return AttributeList::AT_Pascal; 2834 case AttributedType::attr_pcs: 2835 return AttributeList::AT_Pcs; 2836 } 2837 llvm_unreachable("unexpected attribute kind!"); 2838} 2839 2840static void fillAttributedTypeLoc(AttributedTypeLoc TL, 2841 const AttributeList *attrs) { 2842 AttributedType::Kind kind = TL.getAttrKind(); 2843 2844 assert(attrs && "no type attributes in the expected location!"); 2845 AttributeList::Kind parsedKind = getAttrListKind(kind); 2846 while (attrs->getKind() != parsedKind) { 2847 attrs = attrs->getNext(); 2848 assert(attrs && "no matching attribute in expected location!"); 2849 } 2850 2851 TL.setAttrNameLoc(attrs->getLoc()); 2852 if (TL.hasAttrExprOperand()) 2853 TL.setAttrExprOperand(attrs->getArg(0)); 2854 else if (TL.hasAttrEnumOperand()) 2855 TL.setAttrEnumOperandLoc(attrs->getParameterLoc()); 2856 2857 // FIXME: preserve this information to here. 2858 if (TL.hasAttrOperand()) 2859 TL.setAttrOperandParensRange(SourceRange()); 2860} 2861 2862namespace { 2863 class TypeSpecLocFiller : public TypeLocVisitor<TypeSpecLocFiller> { 2864 ASTContext &Context; 2865 const DeclSpec &DS; 2866 2867 public: 2868 TypeSpecLocFiller(ASTContext &Context, const DeclSpec &DS) 2869 : Context(Context), DS(DS) {} 2870 2871 void VisitAttributedTypeLoc(AttributedTypeLoc TL) { 2872 fillAttributedTypeLoc(TL, DS.getAttributes().getList()); 2873 Visit(TL.getModifiedLoc()); 2874 } 2875 void VisitQualifiedTypeLoc(QualifiedTypeLoc TL) { 2876 Visit(TL.getUnqualifiedLoc()); 2877 } 2878 void VisitTypedefTypeLoc(TypedefTypeLoc TL) { 2879 TL.setNameLoc(DS.getTypeSpecTypeLoc()); 2880 } 2881 void VisitObjCInterfaceTypeLoc(ObjCInterfaceTypeLoc TL) { 2882 TL.setNameLoc(DS.getTypeSpecTypeLoc()); 2883 // FIXME. We should have DS.getTypeSpecTypeEndLoc(). But, it requires 2884 // addition field. What we have is good enough for dispay of location 2885 // of 'fixit' on interface name. 2886 TL.setNameEndLoc(DS.getLocEnd()); 2887 } 2888 void VisitObjCObjectTypeLoc(ObjCObjectTypeLoc TL) { 2889 // Handle the base type, which might not have been written explicitly. 2890 if (DS.getTypeSpecType() == DeclSpec::TST_unspecified) { 2891 TL.setHasBaseTypeAsWritten(false); 2892 TL.getBaseLoc().initialize(Context, SourceLocation()); 2893 } else { 2894 TL.setHasBaseTypeAsWritten(true); 2895 Visit(TL.getBaseLoc()); 2896 } 2897 2898 // Protocol qualifiers. 2899 if (DS.getProtocolQualifiers()) { 2900 assert(TL.getNumProtocols() > 0); 2901 assert(TL.getNumProtocols() == DS.getNumProtocolQualifiers()); 2902 TL.setLAngleLoc(DS.getProtocolLAngleLoc()); 2903 TL.setRAngleLoc(DS.getSourceRange().getEnd()); 2904 for (unsigned i = 0, e = DS.getNumProtocolQualifiers(); i != e; ++i) 2905 TL.setProtocolLoc(i, DS.getProtocolLocs()[i]); 2906 } else { 2907 assert(TL.getNumProtocols() == 0); 2908 TL.setLAngleLoc(SourceLocation()); 2909 TL.setRAngleLoc(SourceLocation()); 2910 } 2911 } 2912 void VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL) { 2913 TL.setStarLoc(SourceLocation()); 2914 Visit(TL.getPointeeLoc()); 2915 } 2916 void VisitTemplateSpecializationTypeLoc(TemplateSpecializationTypeLoc TL) { 2917 TypeSourceInfo *TInfo = 0; 2918 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 2919 2920 // If we got no declarator info from previous Sema routines, 2921 // just fill with the typespec loc. 2922 if (!TInfo) { 2923 TL.initialize(Context, DS.getTypeSpecTypeNameLoc()); 2924 return; 2925 } 2926 2927 TypeLoc OldTL = TInfo->getTypeLoc(); 2928 if (TInfo->getType()->getAs<ElaboratedType>()) { 2929 ElaboratedTypeLoc ElabTL = cast<ElaboratedTypeLoc>(OldTL); 2930 TemplateSpecializationTypeLoc NamedTL = 2931 cast<TemplateSpecializationTypeLoc>(ElabTL.getNamedTypeLoc()); 2932 TL.copy(NamedTL); 2933 } 2934 else 2935 TL.copy(cast<TemplateSpecializationTypeLoc>(OldTL)); 2936 } 2937 void VisitTypeOfExprTypeLoc(TypeOfExprTypeLoc TL) { 2938 assert(DS.getTypeSpecType() == DeclSpec::TST_typeofExpr); 2939 TL.setTypeofLoc(DS.getTypeSpecTypeLoc()); 2940 TL.setParensRange(DS.getTypeofParensRange()); 2941 } 2942 void VisitTypeOfTypeLoc(TypeOfTypeLoc TL) { 2943 assert(DS.getTypeSpecType() == DeclSpec::TST_typeofType); 2944 TL.setTypeofLoc(DS.getTypeSpecTypeLoc()); 2945 TL.setParensRange(DS.getTypeofParensRange()); 2946 assert(DS.getRepAsType()); 2947 TypeSourceInfo *TInfo = 0; 2948 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 2949 TL.setUnderlyingTInfo(TInfo); 2950 } 2951 void VisitUnaryTransformTypeLoc(UnaryTransformTypeLoc TL) { 2952 // FIXME: This holds only because we only have one unary transform. 2953 assert(DS.getTypeSpecType() == DeclSpec::TST_underlyingType); 2954 TL.setKWLoc(DS.getTypeSpecTypeLoc()); 2955 TL.setParensRange(DS.getTypeofParensRange()); 2956 assert(DS.getRepAsType()); 2957 TypeSourceInfo *TInfo = 0; 2958 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 2959 TL.setUnderlyingTInfo(TInfo); 2960 } 2961 void VisitBuiltinTypeLoc(BuiltinTypeLoc TL) { 2962 // By default, use the source location of the type specifier. 2963 TL.setBuiltinLoc(DS.getTypeSpecTypeLoc()); 2964 if (TL.needsExtraLocalData()) { 2965 // Set info for the written builtin specifiers. 2966 TL.getWrittenBuiltinSpecs() = DS.getWrittenBuiltinSpecs(); 2967 // Try to have a meaningful source location. 2968 if (TL.getWrittenSignSpec() != TSS_unspecified) 2969 // Sign spec loc overrides the others (e.g., 'unsigned long'). 2970 TL.setBuiltinLoc(DS.getTypeSpecSignLoc()); 2971 else if (TL.getWrittenWidthSpec() != TSW_unspecified) 2972 // Width spec loc overrides type spec loc (e.g., 'short int'). 2973 TL.setBuiltinLoc(DS.getTypeSpecWidthLoc()); 2974 } 2975 } 2976 void VisitElaboratedTypeLoc(ElaboratedTypeLoc TL) { 2977 ElaboratedTypeKeyword Keyword 2978 = TypeWithKeyword::getKeywordForTypeSpec(DS.getTypeSpecType()); 2979 if (DS.getTypeSpecType() == TST_typename) { 2980 TypeSourceInfo *TInfo = 0; 2981 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 2982 if (TInfo) { 2983 TL.copy(cast<ElaboratedTypeLoc>(TInfo->getTypeLoc())); 2984 return; 2985 } 2986 } 2987 TL.setElaboratedKeywordLoc(Keyword != ETK_None 2988 ? DS.getTypeSpecTypeLoc() 2989 : SourceLocation()); 2990 const CXXScopeSpec& SS = DS.getTypeSpecScope(); 2991 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 2992 Visit(TL.getNextTypeLoc().getUnqualifiedLoc()); 2993 } 2994 void VisitDependentNameTypeLoc(DependentNameTypeLoc TL) { 2995 assert(DS.getTypeSpecType() == TST_typename); 2996 TypeSourceInfo *TInfo = 0; 2997 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 2998 assert(TInfo); 2999 TL.copy(cast<DependentNameTypeLoc>(TInfo->getTypeLoc())); 3000 } 3001 void VisitDependentTemplateSpecializationTypeLoc( 3002 DependentTemplateSpecializationTypeLoc TL) { 3003 assert(DS.getTypeSpecType() == TST_typename); 3004 TypeSourceInfo *TInfo = 0; 3005 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 3006 assert(TInfo); 3007 TL.copy(cast<DependentTemplateSpecializationTypeLoc>( 3008 TInfo->getTypeLoc())); 3009 } 3010 void VisitTagTypeLoc(TagTypeLoc TL) { 3011 TL.setNameLoc(DS.getTypeSpecTypeNameLoc()); 3012 } 3013 void VisitAtomicTypeLoc(AtomicTypeLoc TL) { 3014 TL.setKWLoc(DS.getTypeSpecTypeLoc()); 3015 TL.setParensRange(DS.getTypeofParensRange()); 3016 3017 TypeSourceInfo *TInfo = 0; 3018 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 3019 TL.getValueLoc().initializeFullCopy(TInfo->getTypeLoc()); 3020 } 3021 3022 void VisitTypeLoc(TypeLoc TL) { 3023 // FIXME: add other typespec types and change this to an assert. 3024 TL.initialize(Context, DS.getTypeSpecTypeLoc()); 3025 } 3026 }; 3027 3028 class DeclaratorLocFiller : public TypeLocVisitor<DeclaratorLocFiller> { 3029 ASTContext &Context; 3030 const DeclaratorChunk &Chunk; 3031 3032 public: 3033 DeclaratorLocFiller(ASTContext &Context, const DeclaratorChunk &Chunk) 3034 : Context(Context), Chunk(Chunk) {} 3035 3036 void VisitQualifiedTypeLoc(QualifiedTypeLoc TL) { 3037 llvm_unreachable("qualified type locs not expected here!"); 3038 } 3039 3040 void VisitAttributedTypeLoc(AttributedTypeLoc TL) { 3041 fillAttributedTypeLoc(TL, Chunk.getAttrs()); 3042 } 3043 void VisitBlockPointerTypeLoc(BlockPointerTypeLoc TL) { 3044 assert(Chunk.Kind == DeclaratorChunk::BlockPointer); 3045 TL.setCaretLoc(Chunk.Loc); 3046 } 3047 void VisitPointerTypeLoc(PointerTypeLoc TL) { 3048 assert(Chunk.Kind == DeclaratorChunk::Pointer); 3049 TL.setStarLoc(Chunk.Loc); 3050 } 3051 void VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL) { 3052 assert(Chunk.Kind == DeclaratorChunk::Pointer); 3053 TL.setStarLoc(Chunk.Loc); 3054 } 3055 void VisitMemberPointerTypeLoc(MemberPointerTypeLoc TL) { 3056 assert(Chunk.Kind == DeclaratorChunk::MemberPointer); 3057 const CXXScopeSpec& SS = Chunk.Mem.Scope(); 3058 NestedNameSpecifierLoc NNSLoc = SS.getWithLocInContext(Context); 3059 3060 const Type* ClsTy = TL.getClass(); 3061 QualType ClsQT = QualType(ClsTy, 0); 3062 TypeSourceInfo *ClsTInfo = Context.CreateTypeSourceInfo(ClsQT, 0); 3063 // Now copy source location info into the type loc component. 3064 TypeLoc ClsTL = ClsTInfo->getTypeLoc(); 3065 switch (NNSLoc.getNestedNameSpecifier()->getKind()) { 3066 case NestedNameSpecifier::Identifier: 3067 assert(isa<DependentNameType>(ClsTy) && "Unexpected TypeLoc"); 3068 { 3069 DependentNameTypeLoc DNTLoc = cast<DependentNameTypeLoc>(ClsTL); 3070 DNTLoc.setElaboratedKeywordLoc(SourceLocation()); 3071 DNTLoc.setQualifierLoc(NNSLoc.getPrefix()); 3072 DNTLoc.setNameLoc(NNSLoc.getLocalBeginLoc()); 3073 } 3074 break; 3075 3076 case NestedNameSpecifier::TypeSpec: 3077 case NestedNameSpecifier::TypeSpecWithTemplate: 3078 if (isa<ElaboratedType>(ClsTy)) { 3079 ElaboratedTypeLoc ETLoc = *cast<ElaboratedTypeLoc>(&ClsTL); 3080 ETLoc.setElaboratedKeywordLoc(SourceLocation()); 3081 ETLoc.setQualifierLoc(NNSLoc.getPrefix()); 3082 TypeLoc NamedTL = ETLoc.getNamedTypeLoc(); 3083 NamedTL.initializeFullCopy(NNSLoc.getTypeLoc()); 3084 } else { 3085 ClsTL.initializeFullCopy(NNSLoc.getTypeLoc()); 3086 } 3087 break; 3088 3089 case NestedNameSpecifier::Namespace: 3090 case NestedNameSpecifier::NamespaceAlias: 3091 case NestedNameSpecifier::Global: 3092 llvm_unreachable("Nested-name-specifier must name a type"); 3093 } 3094 3095 // Finally fill in MemberPointerLocInfo fields. 3096 TL.setStarLoc(Chunk.Loc); 3097 TL.setClassTInfo(ClsTInfo); 3098 } 3099 void VisitLValueReferenceTypeLoc(LValueReferenceTypeLoc TL) { 3100 assert(Chunk.Kind == DeclaratorChunk::Reference); 3101 // 'Amp' is misleading: this might have been originally 3102 /// spelled with AmpAmp. 3103 TL.setAmpLoc(Chunk.Loc); 3104 } 3105 void VisitRValueReferenceTypeLoc(RValueReferenceTypeLoc TL) { 3106 assert(Chunk.Kind == DeclaratorChunk::Reference); 3107 assert(!Chunk.Ref.LValueRef); 3108 TL.setAmpAmpLoc(Chunk.Loc); 3109 } 3110 void VisitArrayTypeLoc(ArrayTypeLoc TL) { 3111 assert(Chunk.Kind == DeclaratorChunk::Array); 3112 TL.setLBracketLoc(Chunk.Loc); 3113 TL.setRBracketLoc(Chunk.EndLoc); 3114 TL.setSizeExpr(static_cast<Expr*>(Chunk.Arr.NumElts)); 3115 } 3116 void VisitFunctionTypeLoc(FunctionTypeLoc TL) { 3117 assert(Chunk.Kind == DeclaratorChunk::Function); 3118 TL.setLocalRangeBegin(Chunk.Loc); 3119 TL.setLocalRangeEnd(Chunk.EndLoc); 3120 TL.setTrailingReturn(Chunk.Fun.hasTrailingReturnType()); 3121 3122 const DeclaratorChunk::FunctionTypeInfo &FTI = Chunk.Fun; 3123 for (unsigned i = 0, e = TL.getNumArgs(), tpi = 0; i != e; ++i) { 3124 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 3125 TL.setArg(tpi++, Param); 3126 } 3127 // FIXME: exception specs 3128 } 3129 void VisitParenTypeLoc(ParenTypeLoc TL) { 3130 assert(Chunk.Kind == DeclaratorChunk::Paren); 3131 TL.setLParenLoc(Chunk.Loc); 3132 TL.setRParenLoc(Chunk.EndLoc); 3133 } 3134 3135 void VisitTypeLoc(TypeLoc TL) { 3136 llvm_unreachable("unsupported TypeLoc kind in declarator!"); 3137 } 3138 }; 3139} 3140 3141/// \brief Create and instantiate a TypeSourceInfo with type source information. 3142/// 3143/// \param T QualType referring to the type as written in source code. 3144/// 3145/// \param ReturnTypeInfo For declarators whose return type does not show 3146/// up in the normal place in the declaration specifiers (such as a C++ 3147/// conversion function), this pointer will refer to a type source information 3148/// for that return type. 3149TypeSourceInfo * 3150Sema::GetTypeSourceInfoForDeclarator(Declarator &D, QualType T, 3151 TypeSourceInfo *ReturnTypeInfo) { 3152 TypeSourceInfo *TInfo = Context.CreateTypeSourceInfo(T); 3153 UnqualTypeLoc CurrTL = TInfo->getTypeLoc().getUnqualifiedLoc(); 3154 3155 // Handle parameter packs whose type is a pack expansion. 3156 if (isa<PackExpansionType>(T)) { 3157 cast<PackExpansionTypeLoc>(CurrTL).setEllipsisLoc(D.getEllipsisLoc()); 3158 CurrTL = CurrTL.getNextTypeLoc().getUnqualifiedLoc(); 3159 } 3160 3161 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 3162 while (isa<AttributedTypeLoc>(CurrTL)) { 3163 AttributedTypeLoc TL = cast<AttributedTypeLoc>(CurrTL); 3164 fillAttributedTypeLoc(TL, D.getTypeObject(i).getAttrs()); 3165 CurrTL = TL.getNextTypeLoc().getUnqualifiedLoc(); 3166 } 3167 3168 DeclaratorLocFiller(Context, D.getTypeObject(i)).Visit(CurrTL); 3169 CurrTL = CurrTL.getNextTypeLoc().getUnqualifiedLoc(); 3170 } 3171 3172 // If we have different source information for the return type, use 3173 // that. This really only applies to C++ conversion functions. 3174 if (ReturnTypeInfo) { 3175 TypeLoc TL = ReturnTypeInfo->getTypeLoc(); 3176 assert(TL.getFullDataSize() == CurrTL.getFullDataSize()); 3177 memcpy(CurrTL.getOpaqueData(), TL.getOpaqueData(), TL.getFullDataSize()); 3178 } else { 3179 TypeSpecLocFiller(Context, D.getDeclSpec()).Visit(CurrTL); 3180 } 3181 3182 return TInfo; 3183} 3184 3185/// \brief Create a LocInfoType to hold the given QualType and TypeSourceInfo. 3186ParsedType Sema::CreateParsedType(QualType T, TypeSourceInfo *TInfo) { 3187 // FIXME: LocInfoTypes are "transient", only needed for passing to/from Parser 3188 // and Sema during declaration parsing. Try deallocating/caching them when 3189 // it's appropriate, instead of allocating them and keeping them around. 3190 LocInfoType *LocT = (LocInfoType*)BumpAlloc.Allocate(sizeof(LocInfoType), 3191 TypeAlignment); 3192 new (LocT) LocInfoType(T, TInfo); 3193 assert(LocT->getTypeClass() != T->getTypeClass() && 3194 "LocInfoType's TypeClass conflicts with an existing Type class"); 3195 return ParsedType::make(QualType(LocT, 0)); 3196} 3197 3198void LocInfoType::getAsStringInternal(std::string &Str, 3199 const PrintingPolicy &Policy) const { 3200 llvm_unreachable("LocInfoType leaked into the type system; an opaque TypeTy*" 3201 " was used directly instead of getting the QualType through" 3202 " GetTypeFromParser"); 3203} 3204 3205TypeResult Sema::ActOnTypeName(Scope *S, Declarator &D) { 3206 // C99 6.7.6: Type names have no identifier. This is already validated by 3207 // the parser. 3208 assert(D.getIdentifier() == 0 && "Type name should have no identifier!"); 3209 3210 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 3211 QualType T = TInfo->getType(); 3212 if (D.isInvalidType()) 3213 return true; 3214 3215 // Make sure there are no unused decl attributes on the declarator. 3216 // We don't want to do this for ObjC parameters because we're going 3217 // to apply them to the actual parameter declaration. 3218 if (D.getContext() != Declarator::ObjCParameterContext) 3219 checkUnusedDeclAttributes(D); 3220 3221 if (getLangOpts().CPlusPlus) { 3222 // Check that there are no default arguments (C++ only). 3223 CheckExtraCXXDefaultArguments(D); 3224 } 3225 3226 return CreateParsedType(T, TInfo); 3227} 3228 3229ParsedType Sema::ActOnObjCInstanceType(SourceLocation Loc) { 3230 QualType T = Context.getObjCInstanceType(); 3231 TypeSourceInfo *TInfo = Context.getTrivialTypeSourceInfo(T, Loc); 3232 return CreateParsedType(T, TInfo); 3233} 3234 3235 3236//===----------------------------------------------------------------------===// 3237// Type Attribute Processing 3238//===----------------------------------------------------------------------===// 3239 3240/// HandleAddressSpaceTypeAttribute - Process an address_space attribute on the 3241/// specified type. The attribute contains 1 argument, the id of the address 3242/// space for the type. 3243static void HandleAddressSpaceTypeAttribute(QualType &Type, 3244 const AttributeList &Attr, Sema &S){ 3245 3246 // If this type is already address space qualified, reject it. 3247 // ISO/IEC TR 18037 S5.3 (amending C99 6.7.3): "No type shall be qualified by 3248 // qualifiers for two or more different address spaces." 3249 if (Type.getAddressSpace()) { 3250 S.Diag(Attr.getLoc(), diag::err_attribute_address_multiple_qualifiers); 3251 Attr.setInvalid(); 3252 return; 3253 } 3254 3255 // ISO/IEC TR 18037 S5.3 (amending C99 6.7.3): "A function type shall not be 3256 // qualified by an address-space qualifier." 3257 if (Type->isFunctionType()) { 3258 S.Diag(Attr.getLoc(), diag::err_attribute_address_function_type); 3259 Attr.setInvalid(); 3260 return; 3261 } 3262 3263 // Check the attribute arguments. 3264 if (Attr.getNumArgs() != 1) { 3265 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 3266 Attr.setInvalid(); 3267 return; 3268 } 3269 Expr *ASArgExpr = static_cast<Expr *>(Attr.getArg(0)); 3270 llvm::APSInt addrSpace(32); 3271 if (ASArgExpr->isTypeDependent() || ASArgExpr->isValueDependent() || 3272 !ASArgExpr->isIntegerConstantExpr(addrSpace, S.Context)) { 3273 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_not_int) 3274 << ASArgExpr->getSourceRange(); 3275 Attr.setInvalid(); 3276 return; 3277 } 3278 3279 // Bounds checking. 3280 if (addrSpace.isSigned()) { 3281 if (addrSpace.isNegative()) { 3282 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_negative) 3283 << ASArgExpr->getSourceRange(); 3284 Attr.setInvalid(); 3285 return; 3286 } 3287 addrSpace.setIsSigned(false); 3288 } 3289 llvm::APSInt max(addrSpace.getBitWidth()); 3290 max = Qualifiers::MaxAddressSpace; 3291 if (addrSpace > max) { 3292 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_too_high) 3293 << Qualifiers::MaxAddressSpace << ASArgExpr->getSourceRange(); 3294 Attr.setInvalid(); 3295 return; 3296 } 3297 3298 unsigned ASIdx = static_cast<unsigned>(addrSpace.getZExtValue()); 3299 Type = S.Context.getAddrSpaceQualType(Type, ASIdx); 3300} 3301 3302/// Does this type have a "direct" ownership qualifier? That is, 3303/// is it written like "__strong id", as opposed to something like 3304/// "typeof(foo)", where that happens to be strong? 3305static bool hasDirectOwnershipQualifier(QualType type) { 3306 // Fast path: no qualifier at all. 3307 assert(type.getQualifiers().hasObjCLifetime()); 3308 3309 while (true) { 3310 // __strong id 3311 if (const AttributedType *attr = dyn_cast<AttributedType>(type)) { 3312 if (attr->getAttrKind() == AttributedType::attr_objc_ownership) 3313 return true; 3314 3315 type = attr->getModifiedType(); 3316 3317 // X *__strong (...) 3318 } else if (const ParenType *paren = dyn_cast<ParenType>(type)) { 3319 type = paren->getInnerType(); 3320 3321 // That's it for things we want to complain about. In particular, 3322 // we do not want to look through typedefs, typeof(expr), 3323 // typeof(type), or any other way that the type is somehow 3324 // abstracted. 3325 } else { 3326 3327 return false; 3328 } 3329 } 3330} 3331 3332/// handleObjCOwnershipTypeAttr - Process an objc_ownership 3333/// attribute on the specified type. 3334/// 3335/// Returns 'true' if the attribute was handled. 3336static bool handleObjCOwnershipTypeAttr(TypeProcessingState &state, 3337 AttributeList &attr, 3338 QualType &type) { 3339 bool NonObjCPointer = false; 3340 3341 if (!type->isDependentType()) { 3342 if (const PointerType *ptr = type->getAs<PointerType>()) { 3343 QualType pointee = ptr->getPointeeType(); 3344 if (pointee->isObjCRetainableType() || pointee->isPointerType()) 3345 return false; 3346 // It is important not to lose the source info that there was an attribute 3347 // applied to non-objc pointer. We will create an attributed type but 3348 // its type will be the same as the original type. 3349 NonObjCPointer = true; 3350 } else if (!type->isObjCRetainableType()) { 3351 return false; 3352 } 3353 } 3354 3355 Sema &S = state.getSema(); 3356 SourceLocation AttrLoc = attr.getLoc(); 3357 if (AttrLoc.isMacroID()) 3358 AttrLoc = S.getSourceManager().getImmediateExpansionRange(AttrLoc).first; 3359 3360 if (!attr.getParameterName()) { 3361 S.Diag(AttrLoc, diag::err_attribute_argument_n_not_string) 3362 << "objc_ownership" << 1; 3363 attr.setInvalid(); 3364 return true; 3365 } 3366 3367 // Consume lifetime attributes without further comment outside of 3368 // ARC mode. 3369 if (!S.getLangOpts().ObjCAutoRefCount) 3370 return true; 3371 3372 Qualifiers::ObjCLifetime lifetime; 3373 if (attr.getParameterName()->isStr("none")) 3374 lifetime = Qualifiers::OCL_ExplicitNone; 3375 else if (attr.getParameterName()->isStr("strong")) 3376 lifetime = Qualifiers::OCL_Strong; 3377 else if (attr.getParameterName()->isStr("weak")) 3378 lifetime = Qualifiers::OCL_Weak; 3379 else if (attr.getParameterName()->isStr("autoreleasing")) 3380 lifetime = Qualifiers::OCL_Autoreleasing; 3381 else { 3382 S.Diag(AttrLoc, diag::warn_attribute_type_not_supported) 3383 << "objc_ownership" << attr.getParameterName(); 3384 attr.setInvalid(); 3385 return true; 3386 } 3387 3388 SplitQualType underlyingType = type.split(); 3389 3390 // Check for redundant/conflicting ownership qualifiers. 3391 if (Qualifiers::ObjCLifetime previousLifetime 3392 = type.getQualifiers().getObjCLifetime()) { 3393 // If it's written directly, that's an error. 3394 if (hasDirectOwnershipQualifier(type)) { 3395 S.Diag(AttrLoc, diag::err_attr_objc_ownership_redundant) 3396 << type; 3397 return true; 3398 } 3399 3400 // Otherwise, if the qualifiers actually conflict, pull sugar off 3401 // until we reach a type that is directly qualified. 3402 if (previousLifetime != lifetime) { 3403 // This should always terminate: the canonical type is 3404 // qualified, so some bit of sugar must be hiding it. 3405 while (!underlyingType.Quals.hasObjCLifetime()) { 3406 underlyingType = underlyingType.getSingleStepDesugaredType(); 3407 } 3408 underlyingType.Quals.removeObjCLifetime(); 3409 } 3410 } 3411 3412 underlyingType.Quals.addObjCLifetime(lifetime); 3413 3414 if (NonObjCPointer) { 3415 StringRef name = attr.getName()->getName(); 3416 switch (lifetime) { 3417 case Qualifiers::OCL_None: 3418 case Qualifiers::OCL_ExplicitNone: 3419 break; 3420 case Qualifiers::OCL_Strong: name = "__strong"; break; 3421 case Qualifiers::OCL_Weak: name = "__weak"; break; 3422 case Qualifiers::OCL_Autoreleasing: name = "__autoreleasing"; break; 3423 } 3424 S.Diag(AttrLoc, diag::warn_objc_object_attribute_wrong_type) 3425 << name << type; 3426 } 3427 3428 QualType origType = type; 3429 if (!NonObjCPointer) 3430 type = S.Context.getQualifiedType(underlyingType); 3431 3432 // If we have a valid source location for the attribute, use an 3433 // AttributedType instead. 3434 if (AttrLoc.isValid()) 3435 type = S.Context.getAttributedType(AttributedType::attr_objc_ownership, 3436 origType, type); 3437 3438 // Forbid __weak if the runtime doesn't support it. 3439 if (lifetime == Qualifiers::OCL_Weak && 3440 !S.getLangOpts().ObjCRuntimeHasWeak && !NonObjCPointer) { 3441 3442 // Actually, delay this until we know what we're parsing. 3443 if (S.DelayedDiagnostics.shouldDelayDiagnostics()) { 3444 S.DelayedDiagnostics.add( 3445 sema::DelayedDiagnostic::makeForbiddenType( 3446 S.getSourceManager().getExpansionLoc(AttrLoc), 3447 diag::err_arc_weak_no_runtime, type, /*ignored*/ 0)); 3448 } else { 3449 S.Diag(AttrLoc, diag::err_arc_weak_no_runtime); 3450 } 3451 3452 attr.setInvalid(); 3453 return true; 3454 } 3455 3456 // Forbid __weak for class objects marked as 3457 // objc_arc_weak_reference_unavailable 3458 if (lifetime == Qualifiers::OCL_Weak) { 3459 QualType T = type; 3460 while (const PointerType *ptr = T->getAs<PointerType>()) 3461 T = ptr->getPointeeType(); 3462 if (const ObjCObjectPointerType *ObjT = T->getAs<ObjCObjectPointerType>()) { 3463 ObjCInterfaceDecl *Class = ObjT->getInterfaceDecl(); 3464 if (Class->isArcWeakrefUnavailable()) { 3465 S.Diag(AttrLoc, diag::err_arc_unsupported_weak_class); 3466 S.Diag(ObjT->getInterfaceDecl()->getLocation(), 3467 diag::note_class_declared); 3468 } 3469 } 3470 } 3471 3472 return true; 3473} 3474 3475/// handleObjCGCTypeAttr - Process the __attribute__((objc_gc)) type 3476/// attribute on the specified type. Returns true to indicate that 3477/// the attribute was handled, false to indicate that the type does 3478/// not permit the attribute. 3479static bool handleObjCGCTypeAttr(TypeProcessingState &state, 3480 AttributeList &attr, 3481 QualType &type) { 3482 Sema &S = state.getSema(); 3483 3484 // Delay if this isn't some kind of pointer. 3485 if (!type->isPointerType() && 3486 !type->isObjCObjectPointerType() && 3487 !type->isBlockPointerType()) 3488 return false; 3489 3490 if (type.getObjCGCAttr() != Qualifiers::GCNone) { 3491 S.Diag(attr.getLoc(), diag::err_attribute_multiple_objc_gc); 3492 attr.setInvalid(); 3493 return true; 3494 } 3495 3496 // Check the attribute arguments. 3497 if (!attr.getParameterName()) { 3498 S.Diag(attr.getLoc(), diag::err_attribute_argument_n_not_string) 3499 << "objc_gc" << 1; 3500 attr.setInvalid(); 3501 return true; 3502 } 3503 Qualifiers::GC GCAttr; 3504 if (attr.getNumArgs() != 0) { 3505 S.Diag(attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 3506 attr.setInvalid(); 3507 return true; 3508 } 3509 if (attr.getParameterName()->isStr("weak")) 3510 GCAttr = Qualifiers::Weak; 3511 else if (attr.getParameterName()->isStr("strong")) 3512 GCAttr = Qualifiers::Strong; 3513 else { 3514 S.Diag(attr.getLoc(), diag::warn_attribute_type_not_supported) 3515 << "objc_gc" << attr.getParameterName(); 3516 attr.setInvalid(); 3517 return true; 3518 } 3519 3520 QualType origType = type; 3521 type = S.Context.getObjCGCQualType(origType, GCAttr); 3522 3523 // Make an attributed type to preserve the source information. 3524 if (attr.getLoc().isValid()) 3525 type = S.Context.getAttributedType(AttributedType::attr_objc_gc, 3526 origType, type); 3527 3528 return true; 3529} 3530 3531namespace { 3532 /// A helper class to unwrap a type down to a function for the 3533 /// purposes of applying attributes there. 3534 /// 3535 /// Use: 3536 /// FunctionTypeUnwrapper unwrapped(SemaRef, T); 3537 /// if (unwrapped.isFunctionType()) { 3538 /// const FunctionType *fn = unwrapped.get(); 3539 /// // change fn somehow 3540 /// T = unwrapped.wrap(fn); 3541 /// } 3542 struct FunctionTypeUnwrapper { 3543 enum WrapKind { 3544 Desugar, 3545 Parens, 3546 Pointer, 3547 BlockPointer, 3548 Reference, 3549 MemberPointer 3550 }; 3551 3552 QualType Original; 3553 const FunctionType *Fn; 3554 SmallVector<unsigned char /*WrapKind*/, 8> Stack; 3555 3556 FunctionTypeUnwrapper(Sema &S, QualType T) : Original(T) { 3557 while (true) { 3558 const Type *Ty = T.getTypePtr(); 3559 if (isa<FunctionType>(Ty)) { 3560 Fn = cast<FunctionType>(Ty); 3561 return; 3562 } else if (isa<ParenType>(Ty)) { 3563 T = cast<ParenType>(Ty)->getInnerType(); 3564 Stack.push_back(Parens); 3565 } else if (isa<PointerType>(Ty)) { 3566 T = cast<PointerType>(Ty)->getPointeeType(); 3567 Stack.push_back(Pointer); 3568 } else if (isa<BlockPointerType>(Ty)) { 3569 T = cast<BlockPointerType>(Ty)->getPointeeType(); 3570 Stack.push_back(BlockPointer); 3571 } else if (isa<MemberPointerType>(Ty)) { 3572 T = cast<MemberPointerType>(Ty)->getPointeeType(); 3573 Stack.push_back(MemberPointer); 3574 } else if (isa<ReferenceType>(Ty)) { 3575 T = cast<ReferenceType>(Ty)->getPointeeType(); 3576 Stack.push_back(Reference); 3577 } else { 3578 const Type *DTy = Ty->getUnqualifiedDesugaredType(); 3579 if (Ty == DTy) { 3580 Fn = 0; 3581 return; 3582 } 3583 3584 T = QualType(DTy, 0); 3585 Stack.push_back(Desugar); 3586 } 3587 } 3588 } 3589 3590 bool isFunctionType() const { return (Fn != 0); } 3591 const FunctionType *get() const { return Fn; } 3592 3593 QualType wrap(Sema &S, const FunctionType *New) { 3594 // If T wasn't modified from the unwrapped type, do nothing. 3595 if (New == get()) return Original; 3596 3597 Fn = New; 3598 return wrap(S.Context, Original, 0); 3599 } 3600 3601 private: 3602 QualType wrap(ASTContext &C, QualType Old, unsigned I) { 3603 if (I == Stack.size()) 3604 return C.getQualifiedType(Fn, Old.getQualifiers()); 3605 3606 // Build up the inner type, applying the qualifiers from the old 3607 // type to the new type. 3608 SplitQualType SplitOld = Old.split(); 3609 3610 // As a special case, tail-recurse if there are no qualifiers. 3611 if (SplitOld.Quals.empty()) 3612 return wrap(C, SplitOld.Ty, I); 3613 return C.getQualifiedType(wrap(C, SplitOld.Ty, I), SplitOld.Quals); 3614 } 3615 3616 QualType wrap(ASTContext &C, const Type *Old, unsigned I) { 3617 if (I == Stack.size()) return QualType(Fn, 0); 3618 3619 switch (static_cast<WrapKind>(Stack[I++])) { 3620 case Desugar: 3621 // This is the point at which we potentially lose source 3622 // information. 3623 return wrap(C, Old->getUnqualifiedDesugaredType(), I); 3624 3625 case Parens: { 3626 QualType New = wrap(C, cast<ParenType>(Old)->getInnerType(), I); 3627 return C.getParenType(New); 3628 } 3629 3630 case Pointer: { 3631 QualType New = wrap(C, cast<PointerType>(Old)->getPointeeType(), I); 3632 return C.getPointerType(New); 3633 } 3634 3635 case BlockPointer: { 3636 QualType New = wrap(C, cast<BlockPointerType>(Old)->getPointeeType(),I); 3637 return C.getBlockPointerType(New); 3638 } 3639 3640 case MemberPointer: { 3641 const MemberPointerType *OldMPT = cast<MemberPointerType>(Old); 3642 QualType New = wrap(C, OldMPT->getPointeeType(), I); 3643 return C.getMemberPointerType(New, OldMPT->getClass()); 3644 } 3645 3646 case Reference: { 3647 const ReferenceType *OldRef = cast<ReferenceType>(Old); 3648 QualType New = wrap(C, OldRef->getPointeeType(), I); 3649 if (isa<LValueReferenceType>(OldRef)) 3650 return C.getLValueReferenceType(New, OldRef->isSpelledAsLValue()); 3651 else 3652 return C.getRValueReferenceType(New); 3653 } 3654 } 3655 3656 llvm_unreachable("unknown wrapping kind"); 3657 } 3658 }; 3659} 3660 3661/// Process an individual function attribute. Returns true to 3662/// indicate that the attribute was handled, false if it wasn't. 3663static bool handleFunctionTypeAttr(TypeProcessingState &state, 3664 AttributeList &attr, 3665 QualType &type) { 3666 Sema &S = state.getSema(); 3667 3668 FunctionTypeUnwrapper unwrapped(S, type); 3669 3670 if (attr.getKind() == AttributeList::AT_NoReturn) { 3671 if (S.CheckNoReturnAttr(attr)) 3672 return true; 3673 3674 // Delay if this is not a function type. 3675 if (!unwrapped.isFunctionType()) 3676 return false; 3677 3678 // Otherwise we can process right away. 3679 FunctionType::ExtInfo EI = unwrapped.get()->getExtInfo().withNoReturn(true); 3680 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 3681 return true; 3682 } 3683 3684 // ns_returns_retained is not always a type attribute, but if we got 3685 // here, we're treating it as one right now. 3686 if (attr.getKind() == AttributeList::AT_NSReturnsRetained) { 3687 assert(S.getLangOpts().ObjCAutoRefCount && 3688 "ns_returns_retained treated as type attribute in non-ARC"); 3689 if (attr.getNumArgs()) return true; 3690 3691 // Delay if this is not a function type. 3692 if (!unwrapped.isFunctionType()) 3693 return false; 3694 3695 FunctionType::ExtInfo EI 3696 = unwrapped.get()->getExtInfo().withProducesResult(true); 3697 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 3698 return true; 3699 } 3700 3701 if (attr.getKind() == AttributeList::AT_Regparm) { 3702 unsigned value; 3703 if (S.CheckRegparmAttr(attr, value)) 3704 return true; 3705 3706 // Delay if this is not a function type. 3707 if (!unwrapped.isFunctionType()) 3708 return false; 3709 3710 // Diagnose regparm with fastcall. 3711 const FunctionType *fn = unwrapped.get(); 3712 CallingConv CC = fn->getCallConv(); 3713 if (CC == CC_X86FastCall) { 3714 S.Diag(attr.getLoc(), diag::err_attributes_are_not_compatible) 3715 << FunctionType::getNameForCallConv(CC) 3716 << "regparm"; 3717 attr.setInvalid(); 3718 return true; 3719 } 3720 3721 FunctionType::ExtInfo EI = 3722 unwrapped.get()->getExtInfo().withRegParm(value); 3723 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 3724 return true; 3725 } 3726 3727 // Otherwise, a calling convention. 3728 CallingConv CC; 3729 if (S.CheckCallingConvAttr(attr, CC)) 3730 return true; 3731 3732 // Delay if the type didn't work out to a function. 3733 if (!unwrapped.isFunctionType()) return false; 3734 3735 const FunctionType *fn = unwrapped.get(); 3736 CallingConv CCOld = fn->getCallConv(); 3737 if (S.Context.getCanonicalCallConv(CC) == 3738 S.Context.getCanonicalCallConv(CCOld)) { 3739 FunctionType::ExtInfo EI= unwrapped.get()->getExtInfo().withCallingConv(CC); 3740 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 3741 return true; 3742 } 3743 3744 if (CCOld != (S.LangOpts.MRTD ? CC_X86StdCall : CC_Default)) { 3745 // Should we diagnose reapplications of the same convention? 3746 S.Diag(attr.getLoc(), diag::err_attributes_are_not_compatible) 3747 << FunctionType::getNameForCallConv(CC) 3748 << FunctionType::getNameForCallConv(CCOld); 3749 attr.setInvalid(); 3750 return true; 3751 } 3752 3753 // Diagnose the use of X86 fastcall on varargs or unprototyped functions. 3754 if (CC == CC_X86FastCall) { 3755 if (isa<FunctionNoProtoType>(fn)) { 3756 S.Diag(attr.getLoc(), diag::err_cconv_knr) 3757 << FunctionType::getNameForCallConv(CC); 3758 attr.setInvalid(); 3759 return true; 3760 } 3761 3762 const FunctionProtoType *FnP = cast<FunctionProtoType>(fn); 3763 if (FnP->isVariadic()) { 3764 S.Diag(attr.getLoc(), diag::err_cconv_varargs) 3765 << FunctionType::getNameForCallConv(CC); 3766 attr.setInvalid(); 3767 return true; 3768 } 3769 3770 // Also diagnose fastcall with regparm. 3771 if (fn->getHasRegParm()) { 3772 S.Diag(attr.getLoc(), diag::err_attributes_are_not_compatible) 3773 << "regparm" 3774 << FunctionType::getNameForCallConv(CC); 3775 attr.setInvalid(); 3776 return true; 3777 } 3778 } 3779 3780 FunctionType::ExtInfo EI = unwrapped.get()->getExtInfo().withCallingConv(CC); 3781 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 3782 return true; 3783} 3784 3785/// Handle OpenCL image access qualifiers: read_only, write_only, read_write 3786static void HandleOpenCLImageAccessAttribute(QualType& CurType, 3787 const AttributeList &Attr, 3788 Sema &S) { 3789 // Check the attribute arguments. 3790 if (Attr.getNumArgs() != 1) { 3791 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 3792 Attr.setInvalid(); 3793 return; 3794 } 3795 Expr *sizeExpr = static_cast<Expr *>(Attr.getArg(0)); 3796 llvm::APSInt arg(32); 3797 if (sizeExpr->isTypeDependent() || sizeExpr->isValueDependent() || 3798 !sizeExpr->isIntegerConstantExpr(arg, S.Context)) { 3799 S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int) 3800 << "opencl_image_access" << sizeExpr->getSourceRange(); 3801 Attr.setInvalid(); 3802 return; 3803 } 3804 unsigned iarg = static_cast<unsigned>(arg.getZExtValue()); 3805 switch (iarg) { 3806 case CLIA_read_only: 3807 case CLIA_write_only: 3808 case CLIA_read_write: 3809 // Implemented in a separate patch 3810 break; 3811 default: 3812 // Implemented in a separate patch 3813 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_size) 3814 << sizeExpr->getSourceRange(); 3815 Attr.setInvalid(); 3816 break; 3817 } 3818} 3819 3820/// HandleVectorSizeAttribute - this attribute is only applicable to integral 3821/// and float scalars, although arrays, pointers, and function return values are 3822/// allowed in conjunction with this construct. Aggregates with this attribute 3823/// are invalid, even if they are of the same size as a corresponding scalar. 3824/// The raw attribute should contain precisely 1 argument, the vector size for 3825/// the variable, measured in bytes. If curType and rawAttr are well formed, 3826/// this routine will return a new vector type. 3827static void HandleVectorSizeAttr(QualType& CurType, const AttributeList &Attr, 3828 Sema &S) { 3829 // Check the attribute arguments. 3830 if (Attr.getNumArgs() != 1) { 3831 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 3832 Attr.setInvalid(); 3833 return; 3834 } 3835 Expr *sizeExpr = static_cast<Expr *>(Attr.getArg(0)); 3836 llvm::APSInt vecSize(32); 3837 if (sizeExpr->isTypeDependent() || sizeExpr->isValueDependent() || 3838 !sizeExpr->isIntegerConstantExpr(vecSize, S.Context)) { 3839 S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int) 3840 << "vector_size" << sizeExpr->getSourceRange(); 3841 Attr.setInvalid(); 3842 return; 3843 } 3844 // the base type must be integer or float, and can't already be a vector. 3845 if (!CurType->isIntegerType() && !CurType->isRealFloatingType()) { 3846 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_vector_type) << CurType; 3847 Attr.setInvalid(); 3848 return; 3849 } 3850 unsigned typeSize = static_cast<unsigned>(S.Context.getTypeSize(CurType)); 3851 // vecSize is specified in bytes - convert to bits. 3852 unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue() * 8); 3853 3854 // the vector size needs to be an integral multiple of the type size. 3855 if (vectorSize % typeSize) { 3856 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_size) 3857 << sizeExpr->getSourceRange(); 3858 Attr.setInvalid(); 3859 return; 3860 } 3861 if (vectorSize == 0) { 3862 S.Diag(Attr.getLoc(), diag::err_attribute_zero_size) 3863 << sizeExpr->getSourceRange(); 3864 Attr.setInvalid(); 3865 return; 3866 } 3867 3868 // Success! Instantiate the vector type, the number of elements is > 0, and 3869 // not required to be a power of 2, unlike GCC. 3870 CurType = S.Context.getVectorType(CurType, vectorSize/typeSize, 3871 VectorType::GenericVector); 3872} 3873 3874/// \brief Process the OpenCL-like ext_vector_type attribute when it occurs on 3875/// a type. 3876static void HandleExtVectorTypeAttr(QualType &CurType, 3877 const AttributeList &Attr, 3878 Sema &S) { 3879 Expr *sizeExpr; 3880 3881 // Special case where the argument is a template id. 3882 if (Attr.getParameterName()) { 3883 CXXScopeSpec SS; 3884 SourceLocation TemplateKWLoc; 3885 UnqualifiedId id; 3886 id.setIdentifier(Attr.getParameterName(), Attr.getLoc()); 3887 3888 ExprResult Size = S.ActOnIdExpression(S.getCurScope(), SS, TemplateKWLoc, 3889 id, false, false); 3890 if (Size.isInvalid()) 3891 return; 3892 3893 sizeExpr = Size.get(); 3894 } else { 3895 // check the attribute arguments. 3896 if (Attr.getNumArgs() != 1) { 3897 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 3898 return; 3899 } 3900 sizeExpr = Attr.getArg(0); 3901 } 3902 3903 // Create the vector type. 3904 QualType T = S.BuildExtVectorType(CurType, sizeExpr, Attr.getLoc()); 3905 if (!T.isNull()) 3906 CurType = T; 3907} 3908 3909/// HandleNeonVectorTypeAttr - The "neon_vector_type" and 3910/// "neon_polyvector_type" attributes are used to create vector types that 3911/// are mangled according to ARM's ABI. Otherwise, these types are identical 3912/// to those created with the "vector_size" attribute. Unlike "vector_size" 3913/// the argument to these Neon attributes is the number of vector elements, 3914/// not the vector size in bytes. The vector width and element type must 3915/// match one of the standard Neon vector types. 3916static void HandleNeonVectorTypeAttr(QualType& CurType, 3917 const AttributeList &Attr, Sema &S, 3918 VectorType::VectorKind VecKind, 3919 const char *AttrName) { 3920 // Check the attribute arguments. 3921 if (Attr.getNumArgs() != 1) { 3922 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 3923 Attr.setInvalid(); 3924 return; 3925 } 3926 // The number of elements must be an ICE. 3927 Expr *numEltsExpr = static_cast<Expr *>(Attr.getArg(0)); 3928 llvm::APSInt numEltsInt(32); 3929 if (numEltsExpr->isTypeDependent() || numEltsExpr->isValueDependent() || 3930 !numEltsExpr->isIntegerConstantExpr(numEltsInt, S.Context)) { 3931 S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int) 3932 << AttrName << numEltsExpr->getSourceRange(); 3933 Attr.setInvalid(); 3934 return; 3935 } 3936 // Only certain element types are supported for Neon vectors. 3937 const BuiltinType* BTy = CurType->getAs<BuiltinType>(); 3938 if (!BTy || 3939 (VecKind == VectorType::NeonPolyVector && 3940 BTy->getKind() != BuiltinType::SChar && 3941 BTy->getKind() != BuiltinType::Short) || 3942 (BTy->getKind() != BuiltinType::SChar && 3943 BTy->getKind() != BuiltinType::UChar && 3944 BTy->getKind() != BuiltinType::Short && 3945 BTy->getKind() != BuiltinType::UShort && 3946 BTy->getKind() != BuiltinType::Int && 3947 BTy->getKind() != BuiltinType::UInt && 3948 BTy->getKind() != BuiltinType::LongLong && 3949 BTy->getKind() != BuiltinType::ULongLong && 3950 BTy->getKind() != BuiltinType::Float)) { 3951 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_vector_type) <<CurType; 3952 Attr.setInvalid(); 3953 return; 3954 } 3955 // The total size of the vector must be 64 or 128 bits. 3956 unsigned typeSize = static_cast<unsigned>(S.Context.getTypeSize(CurType)); 3957 unsigned numElts = static_cast<unsigned>(numEltsInt.getZExtValue()); 3958 unsigned vecSize = typeSize * numElts; 3959 if (vecSize != 64 && vecSize != 128) { 3960 S.Diag(Attr.getLoc(), diag::err_attribute_bad_neon_vector_size) << CurType; 3961 Attr.setInvalid(); 3962 return; 3963 } 3964 3965 CurType = S.Context.getVectorType(CurType, numElts, VecKind); 3966} 3967 3968static void processTypeAttrs(TypeProcessingState &state, QualType &type, 3969 bool isDeclSpec, AttributeList *attrs) { 3970 // Scan through and apply attributes to this type where it makes sense. Some 3971 // attributes (such as __address_space__, __vector_size__, etc) apply to the 3972 // type, but others can be present in the type specifiers even though they 3973 // apply to the decl. Here we apply type attributes and ignore the rest. 3974 3975 AttributeList *next; 3976 do { 3977 AttributeList &attr = *attrs; 3978 next = attr.getNext(); 3979 3980 // Skip attributes that were marked to be invalid. 3981 if (attr.isInvalid()) 3982 continue; 3983 3984 // If this is an attribute we can handle, do so now, 3985 // otherwise, add it to the FnAttrs list for rechaining. 3986 switch (attr.getKind()) { 3987 default: break; 3988 3989 case AttributeList::AT_MayAlias: 3990 // FIXME: This attribute needs to actually be handled, but if we ignore 3991 // it it breaks large amounts of Linux software. 3992 attr.setUsedAsTypeAttr(); 3993 break; 3994 case AttributeList::AT_AddressSpace: 3995 HandleAddressSpaceTypeAttribute(type, attr, state.getSema()); 3996 attr.setUsedAsTypeAttr(); 3997 break; 3998 OBJC_POINTER_TYPE_ATTRS_CASELIST: 3999 if (!handleObjCPointerTypeAttr(state, attr, type)) 4000 distributeObjCPointerTypeAttr(state, attr, type); 4001 attr.setUsedAsTypeAttr(); 4002 break; 4003 case AttributeList::AT_VectorSize: 4004 HandleVectorSizeAttr(type, attr, state.getSema()); 4005 attr.setUsedAsTypeAttr(); 4006 break; 4007 case AttributeList::AT_ExtVectorType: 4008 if (state.getDeclarator().getDeclSpec().getStorageClassSpec() 4009 != DeclSpec::SCS_typedef) 4010 HandleExtVectorTypeAttr(type, attr, state.getSema()); 4011 attr.setUsedAsTypeAttr(); 4012 break; 4013 case AttributeList::AT_NeonVectorType: 4014 HandleNeonVectorTypeAttr(type, attr, state.getSema(), 4015 VectorType::NeonVector, "neon_vector_type"); 4016 attr.setUsedAsTypeAttr(); 4017 break; 4018 case AttributeList::AT_NeonPolyVectorType: 4019 HandleNeonVectorTypeAttr(type, attr, state.getSema(), 4020 VectorType::NeonPolyVector, 4021 "neon_polyvector_type"); 4022 attr.setUsedAsTypeAttr(); 4023 break; 4024 case AttributeList::AT_OpenCLImageAccess: 4025 HandleOpenCLImageAccessAttribute(type, attr, state.getSema()); 4026 attr.setUsedAsTypeAttr(); 4027 break; 4028 4029 case AttributeList::AT_Win64: 4030 case AttributeList::AT_Ptr32: 4031 case AttributeList::AT_Ptr64: 4032 // FIXME: don't ignore these 4033 attr.setUsedAsTypeAttr(); 4034 break; 4035 4036 case AttributeList::AT_NSReturnsRetained: 4037 if (!state.getSema().getLangOpts().ObjCAutoRefCount) 4038 break; 4039 // fallthrough into the function attrs 4040 4041 FUNCTION_TYPE_ATTRS_CASELIST: 4042 attr.setUsedAsTypeAttr(); 4043 4044 // Never process function type attributes as part of the 4045 // declaration-specifiers. 4046 if (isDeclSpec) 4047 distributeFunctionTypeAttrFromDeclSpec(state, attr, type); 4048 4049 // Otherwise, handle the possible delays. 4050 else if (!handleFunctionTypeAttr(state, attr, type)) 4051 distributeFunctionTypeAttr(state, attr, type); 4052 break; 4053 } 4054 } while ((attrs = next)); 4055} 4056 4057/// \brief Ensure that the type of the given expression is complete. 4058/// 4059/// This routine checks whether the expression \p E has a complete type. If the 4060/// expression refers to an instantiable construct, that instantiation is 4061/// performed as needed to complete its type. Furthermore 4062/// Sema::RequireCompleteType is called for the expression's type (or in the 4063/// case of a reference type, the referred-to type). 4064/// 4065/// \param E The expression whose type is required to be complete. 4066/// \param Diagnoser The object that will emit a diagnostic if the type is 4067/// incomplete. 4068/// 4069/// \returns \c true if the type of \p E is incomplete and diagnosed, \c false 4070/// otherwise. 4071bool Sema::RequireCompleteExprType(Expr *E, TypeDiagnoser &Diagnoser){ 4072 QualType T = E->getType(); 4073 4074 // Fast path the case where the type is already complete. 4075 if (!T->isIncompleteType()) 4076 return false; 4077 4078 // Incomplete array types may be completed by the initializer attached to 4079 // their definitions. For static data members of class templates we need to 4080 // instantiate the definition to get this initializer and complete the type. 4081 if (T->isIncompleteArrayType()) { 4082 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E->IgnoreParens())) { 4083 if (VarDecl *Var = dyn_cast<VarDecl>(DRE->getDecl())) { 4084 if (Var->isStaticDataMember() && 4085 Var->getInstantiatedFromStaticDataMember()) { 4086 4087 MemberSpecializationInfo *MSInfo = Var->getMemberSpecializationInfo(); 4088 assert(MSInfo && "Missing member specialization information?"); 4089 if (MSInfo->getTemplateSpecializationKind() 4090 != TSK_ExplicitSpecialization) { 4091 // If we don't already have a point of instantiation, this is it. 4092 if (MSInfo->getPointOfInstantiation().isInvalid()) { 4093 MSInfo->setPointOfInstantiation(E->getLocStart()); 4094 4095 // This is a modification of an existing AST node. Notify 4096 // listeners. 4097 if (ASTMutationListener *L = getASTMutationListener()) 4098 L->StaticDataMemberInstantiated(Var); 4099 } 4100 4101 InstantiateStaticDataMemberDefinition(E->getExprLoc(), Var); 4102 4103 // Update the type to the newly instantiated definition's type both 4104 // here and within the expression. 4105 if (VarDecl *Def = Var->getDefinition()) { 4106 DRE->setDecl(Def); 4107 T = Def->getType(); 4108 DRE->setType(T); 4109 E->setType(T); 4110 } 4111 } 4112 4113 // We still go on to try to complete the type independently, as it 4114 // may also require instantiations or diagnostics if it remains 4115 // incomplete. 4116 } 4117 } 4118 } 4119 } 4120 4121 // FIXME: Are there other cases which require instantiating something other 4122 // than the type to complete the type of an expression? 4123 4124 // Look through reference types and complete the referred type. 4125 if (const ReferenceType *Ref = T->getAs<ReferenceType>()) 4126 T = Ref->getPointeeType(); 4127 4128 return RequireCompleteType(E->getExprLoc(), T, Diagnoser); 4129} 4130 4131namespace { 4132 struct TypeDiagnoserDiag : Sema::TypeDiagnoser { 4133 unsigned DiagID; 4134 4135 TypeDiagnoserDiag(unsigned DiagID) 4136 : Sema::TypeDiagnoser(DiagID == 0), DiagID(DiagID) {} 4137 4138 virtual void diagnose(Sema &S, SourceLocation Loc, QualType T) { 4139 if (Suppressed) return; 4140 S.Diag(Loc, DiagID) << T; 4141 } 4142 }; 4143} 4144 4145bool Sema::RequireCompleteExprType(Expr *E, unsigned DiagID) { 4146 TypeDiagnoserDiag Diagnoser(DiagID); 4147 return RequireCompleteExprType(E, Diagnoser); 4148} 4149 4150/// @brief Ensure that the type T is a complete type. 4151/// 4152/// This routine checks whether the type @p T is complete in any 4153/// context where a complete type is required. If @p T is a complete 4154/// type, returns false. If @p T is a class template specialization, 4155/// this routine then attempts to perform class template 4156/// instantiation. If instantiation fails, or if @p T is incomplete 4157/// and cannot be completed, issues the diagnostic @p diag (giving it 4158/// the type @p T) and returns true. 4159/// 4160/// @param Loc The location in the source that the incomplete type 4161/// diagnostic should refer to. 4162/// 4163/// @param T The type that this routine is examining for completeness. 4164/// 4165/// @returns @c true if @p T is incomplete and a diagnostic was emitted, 4166/// @c false otherwise. 4167bool Sema::RequireCompleteType(SourceLocation Loc, QualType T, 4168 TypeDiagnoser &Diagnoser) { 4169 // FIXME: Add this assertion to make sure we always get instantiation points. 4170 // assert(!Loc.isInvalid() && "Invalid location in RequireCompleteType"); 4171 // FIXME: Add this assertion to help us flush out problems with 4172 // checking for dependent types and type-dependent expressions. 4173 // 4174 // assert(!T->isDependentType() && 4175 // "Can't ask whether a dependent type is complete"); 4176 4177 // If we have a complete type, we're done. 4178 NamedDecl *Def = 0; 4179 if (!T->isIncompleteType(&Def)) { 4180 // If we know about the definition but it is not visible, complain. 4181 if (!Diagnoser.Suppressed && Def && !LookupResult::isVisible(Def)) { 4182 // Suppress this error outside of a SFINAE context if we've already 4183 // emitted the error once for this type. There's no usefulness in 4184 // repeating the diagnostic. 4185 // FIXME: Add a Fix-It that imports the corresponding module or includes 4186 // the header. 4187 if (isSFINAEContext() || HiddenDefinitions.insert(Def)) { 4188 Diag(Loc, diag::err_module_private_definition) << T; 4189 Diag(Def->getLocation(), diag::note_previous_definition); 4190 } 4191 } 4192 4193 return false; 4194 } 4195 4196 const TagType *Tag = T->getAs<TagType>(); 4197 const ObjCInterfaceType *IFace = 0; 4198 4199 if (Tag) { 4200 // Avoid diagnosing invalid decls as incomplete. 4201 if (Tag->getDecl()->isInvalidDecl()) 4202 return true; 4203 4204 // Give the external AST source a chance to complete the type. 4205 if (Tag->getDecl()->hasExternalLexicalStorage()) { 4206 Context.getExternalSource()->CompleteType(Tag->getDecl()); 4207 if (!Tag->isIncompleteType()) 4208 return false; 4209 } 4210 } 4211 else if ((IFace = T->getAs<ObjCInterfaceType>())) { 4212 // Avoid diagnosing invalid decls as incomplete. 4213 if (IFace->getDecl()->isInvalidDecl()) 4214 return true; 4215 4216 // Give the external AST source a chance to complete the type. 4217 if (IFace->getDecl()->hasExternalLexicalStorage()) { 4218 Context.getExternalSource()->CompleteType(IFace->getDecl()); 4219 if (!IFace->isIncompleteType()) 4220 return false; 4221 } 4222 } 4223 4224 // If we have a class template specialization or a class member of a 4225 // class template specialization, or an array with known size of such, 4226 // try to instantiate it. 4227 QualType MaybeTemplate = T; 4228 while (const ConstantArrayType *Array 4229 = Context.getAsConstantArrayType(MaybeTemplate)) 4230 MaybeTemplate = Array->getElementType(); 4231 if (const RecordType *Record = MaybeTemplate->getAs<RecordType>()) { 4232 if (ClassTemplateSpecializationDecl *ClassTemplateSpec 4233 = dyn_cast<ClassTemplateSpecializationDecl>(Record->getDecl())) { 4234 if (ClassTemplateSpec->getSpecializationKind() == TSK_Undeclared) 4235 return InstantiateClassTemplateSpecialization(Loc, ClassTemplateSpec, 4236 TSK_ImplicitInstantiation, 4237 /*Complain=*/!Diagnoser.Suppressed); 4238 } else if (CXXRecordDecl *Rec 4239 = dyn_cast<CXXRecordDecl>(Record->getDecl())) { 4240 CXXRecordDecl *Pattern = Rec->getInstantiatedFromMemberClass(); 4241 if (!Rec->isBeingDefined() && Pattern) { 4242 MemberSpecializationInfo *MSI = Rec->getMemberSpecializationInfo(); 4243 assert(MSI && "Missing member specialization information?"); 4244 // This record was instantiated from a class within a template. 4245 if (MSI->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 4246 return InstantiateClass(Loc, Rec, Pattern, 4247 getTemplateInstantiationArgs(Rec), 4248 TSK_ImplicitInstantiation, 4249 /*Complain=*/!Diagnoser.Suppressed); 4250 } 4251 } 4252 } 4253 4254 if (Diagnoser.Suppressed) 4255 return true; 4256 4257 // We have an incomplete type. Produce a diagnostic. 4258 Diagnoser.diagnose(*this, Loc, T); 4259 4260 // If the type was a forward declaration of a class/struct/union 4261 // type, produce a note. 4262 if (Tag && !Tag->getDecl()->isInvalidDecl()) 4263 Diag(Tag->getDecl()->getLocation(), 4264 Tag->isBeingDefined() ? diag::note_type_being_defined 4265 : diag::note_forward_declaration) 4266 << QualType(Tag, 0); 4267 4268 // If the Objective-C class was a forward declaration, produce a note. 4269 if (IFace && !IFace->getDecl()->isInvalidDecl()) 4270 Diag(IFace->getDecl()->getLocation(), diag::note_forward_class); 4271 4272 return true; 4273} 4274 4275bool Sema::RequireCompleteType(SourceLocation Loc, QualType T, 4276 unsigned DiagID) { 4277 TypeDiagnoserDiag Diagnoser(DiagID); 4278 return RequireCompleteType(Loc, T, Diagnoser); 4279} 4280 4281/// @brief Ensure that the type T is a literal type. 4282/// 4283/// This routine checks whether the type @p T is a literal type. If @p T is an 4284/// incomplete type, an attempt is made to complete it. If @p T is a literal 4285/// type, or @p AllowIncompleteType is true and @p T is an incomplete type, 4286/// returns false. Otherwise, this routine issues the diagnostic @p PD (giving 4287/// it the type @p T), along with notes explaining why the type is not a 4288/// literal type, and returns true. 4289/// 4290/// @param Loc The location in the source that the non-literal type 4291/// diagnostic should refer to. 4292/// 4293/// @param T The type that this routine is examining for literalness. 4294/// 4295/// @param Diagnoser Emits a diagnostic if T is not a literal type. 4296/// 4297/// @returns @c true if @p T is not a literal type and a diagnostic was emitted, 4298/// @c false otherwise. 4299bool Sema::RequireLiteralType(SourceLocation Loc, QualType T, 4300 TypeDiagnoser &Diagnoser) { 4301 assert(!T->isDependentType() && "type should not be dependent"); 4302 4303 QualType ElemType = Context.getBaseElementType(T); 4304 RequireCompleteType(Loc, ElemType, 0); 4305 4306 if (T->isLiteralType()) 4307 return false; 4308 4309 if (Diagnoser.Suppressed) 4310 return true; 4311 4312 Diagnoser.diagnose(*this, Loc, T); 4313 4314 if (T->isVariableArrayType()) 4315 return true; 4316 4317 const RecordType *RT = ElemType->getAs<RecordType>(); 4318 if (!RT) 4319 return true; 4320 4321 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 4322 4323 // A partially-defined class type can't be a literal type, because a literal 4324 // class type must have a trivial destructor (which can't be checked until 4325 // the class definition is complete). 4326 if (!RD->isCompleteDefinition()) { 4327 RequireCompleteType(Loc, ElemType, diag::note_non_literal_incomplete, T); 4328 return true; 4329 } 4330 4331 // If the class has virtual base classes, then it's not an aggregate, and 4332 // cannot have any constexpr constructors or a trivial default constructor, 4333 // so is non-literal. This is better to diagnose than the resulting absence 4334 // of constexpr constructors. 4335 if (RD->getNumVBases()) { 4336 Diag(RD->getLocation(), diag::note_non_literal_virtual_base) 4337 << RD->isStruct() << RD->getNumVBases(); 4338 for (CXXRecordDecl::base_class_const_iterator I = RD->vbases_begin(), 4339 E = RD->vbases_end(); I != E; ++I) 4340 Diag(I->getLocStart(), 4341 diag::note_constexpr_virtual_base_here) << I->getSourceRange(); 4342 } else if (!RD->isAggregate() && !RD->hasConstexprNonCopyMoveConstructor() && 4343 !RD->hasTrivialDefaultConstructor()) { 4344 Diag(RD->getLocation(), diag::note_non_literal_no_constexpr_ctors) << RD; 4345 } else if (RD->hasNonLiteralTypeFieldsOrBases()) { 4346 for (CXXRecordDecl::base_class_const_iterator I = RD->bases_begin(), 4347 E = RD->bases_end(); I != E; ++I) { 4348 if (!I->getType()->isLiteralType()) { 4349 Diag(I->getLocStart(), 4350 diag::note_non_literal_base_class) 4351 << RD << I->getType() << I->getSourceRange(); 4352 return true; 4353 } 4354 } 4355 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 4356 E = RD->field_end(); I != E; ++I) { 4357 if (!I->getType()->isLiteralType() || 4358 I->getType().isVolatileQualified()) { 4359 Diag(I->getLocation(), diag::note_non_literal_field) 4360 << RD << *I << I->getType() 4361 << I->getType().isVolatileQualified(); 4362 return true; 4363 } 4364 } 4365 } else if (!RD->hasTrivialDestructor()) { 4366 // All fields and bases are of literal types, so have trivial destructors. 4367 // If this class's destructor is non-trivial it must be user-declared. 4368 CXXDestructorDecl *Dtor = RD->getDestructor(); 4369 assert(Dtor && "class has literal fields and bases but no dtor?"); 4370 if (!Dtor) 4371 return true; 4372 4373 Diag(Dtor->getLocation(), Dtor->isUserProvided() ? 4374 diag::note_non_literal_user_provided_dtor : 4375 diag::note_non_literal_nontrivial_dtor) << RD; 4376 } 4377 4378 return true; 4379} 4380 4381bool Sema::RequireLiteralType(SourceLocation Loc, QualType T, unsigned DiagID) { 4382 TypeDiagnoserDiag Diagnoser(DiagID); 4383 return RequireLiteralType(Loc, T, Diagnoser); 4384} 4385 4386/// \brief Retrieve a version of the type 'T' that is elaborated by Keyword 4387/// and qualified by the nested-name-specifier contained in SS. 4388QualType Sema::getElaboratedType(ElaboratedTypeKeyword Keyword, 4389 const CXXScopeSpec &SS, QualType T) { 4390 if (T.isNull()) 4391 return T; 4392 NestedNameSpecifier *NNS; 4393 if (SS.isValid()) 4394 NNS = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 4395 else { 4396 if (Keyword == ETK_None) 4397 return T; 4398 NNS = 0; 4399 } 4400 return Context.getElaboratedType(Keyword, NNS, T); 4401} 4402 4403QualType Sema::BuildTypeofExprType(Expr *E, SourceLocation Loc) { 4404 ExprResult ER = CheckPlaceholderExpr(E); 4405 if (ER.isInvalid()) return QualType(); 4406 E = ER.take(); 4407 4408 if (!E->isTypeDependent()) { 4409 QualType T = E->getType(); 4410 if (const TagType *TT = T->getAs<TagType>()) 4411 DiagnoseUseOfDecl(TT->getDecl(), E->getExprLoc()); 4412 } 4413 return Context.getTypeOfExprType(E); 4414} 4415 4416/// getDecltypeForExpr - Given an expr, will return the decltype for 4417/// that expression, according to the rules in C++11 4418/// [dcl.type.simple]p4 and C++11 [expr.lambda.prim]p18. 4419static QualType getDecltypeForExpr(Sema &S, Expr *E) { 4420 if (E->isTypeDependent()) 4421 return S.Context.DependentTy; 4422 4423 // C++11 [dcl.type.simple]p4: 4424 // The type denoted by decltype(e) is defined as follows: 4425 // 4426 // - if e is an unparenthesized id-expression or an unparenthesized class 4427 // member access (5.2.5), decltype(e) is the type of the entity named 4428 // by e. If there is no such entity, or if e names a set of overloaded 4429 // functions, the program is ill-formed; 4430 if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E)) { 4431 if (const ValueDecl *VD = dyn_cast<ValueDecl>(DRE->getDecl())) 4432 return VD->getType(); 4433 } 4434 if (const MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 4435 if (const FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl())) 4436 return FD->getType(); 4437 } 4438 4439 // C++11 [expr.lambda.prim]p18: 4440 // Every occurrence of decltype((x)) where x is a possibly 4441 // parenthesized id-expression that names an entity of automatic 4442 // storage duration is treated as if x were transformed into an 4443 // access to a corresponding data member of the closure type that 4444 // would have been declared if x were an odr-use of the denoted 4445 // entity. 4446 using namespace sema; 4447 if (S.getCurLambda()) { 4448 if (isa<ParenExpr>(E)) { 4449 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E->IgnoreParens())) { 4450 if (VarDecl *Var = dyn_cast<VarDecl>(DRE->getDecl())) { 4451 QualType T = S.getCapturedDeclRefType(Var, DRE->getLocation()); 4452 if (!T.isNull()) 4453 return S.Context.getLValueReferenceType(T); 4454 } 4455 } 4456 } 4457 } 4458 4459 4460 // C++11 [dcl.type.simple]p4: 4461 // [...] 4462 QualType T = E->getType(); 4463 switch (E->getValueKind()) { 4464 // - otherwise, if e is an xvalue, decltype(e) is T&&, where T is the 4465 // type of e; 4466 case VK_XValue: T = S.Context.getRValueReferenceType(T); break; 4467 // - otherwise, if e is an lvalue, decltype(e) is T&, where T is the 4468 // type of e; 4469 case VK_LValue: T = S.Context.getLValueReferenceType(T); break; 4470 // - otherwise, decltype(e) is the type of e. 4471 case VK_RValue: break; 4472 } 4473 4474 return T; 4475} 4476 4477QualType Sema::BuildDecltypeType(Expr *E, SourceLocation Loc) { 4478 ExprResult ER = CheckPlaceholderExpr(E); 4479 if (ER.isInvalid()) return QualType(); 4480 E = ER.take(); 4481 4482 return Context.getDecltypeType(E, getDecltypeForExpr(*this, E)); 4483} 4484 4485QualType Sema::BuildUnaryTransformType(QualType BaseType, 4486 UnaryTransformType::UTTKind UKind, 4487 SourceLocation Loc) { 4488 switch (UKind) { 4489 case UnaryTransformType::EnumUnderlyingType: 4490 if (!BaseType->isDependentType() && !BaseType->isEnumeralType()) { 4491 Diag(Loc, diag::err_only_enums_have_underlying_types); 4492 return QualType(); 4493 } else { 4494 QualType Underlying = BaseType; 4495 if (!BaseType->isDependentType()) { 4496 EnumDecl *ED = BaseType->getAs<EnumType>()->getDecl(); 4497 assert(ED && "EnumType has no EnumDecl"); 4498 DiagnoseUseOfDecl(ED, Loc); 4499 Underlying = ED->getIntegerType(); 4500 } 4501 assert(!Underlying.isNull()); 4502 return Context.getUnaryTransformType(BaseType, Underlying, 4503 UnaryTransformType::EnumUnderlyingType); 4504 } 4505 } 4506 llvm_unreachable("unknown unary transform type"); 4507} 4508 4509QualType Sema::BuildAtomicType(QualType T, SourceLocation Loc) { 4510 if (!T->isDependentType()) { 4511 // FIXME: It isn't entirely clear whether incomplete atomic types 4512 // are allowed or not; for simplicity, ban them for the moment. 4513 if (RequireCompleteType(Loc, T, diag::err_atomic_specifier_bad_type, 0)) 4514 return QualType(); 4515 4516 int DisallowedKind = -1; 4517 if (T->isArrayType()) 4518 DisallowedKind = 1; 4519 else if (T->isFunctionType()) 4520 DisallowedKind = 2; 4521 else if (T->isReferenceType()) 4522 DisallowedKind = 3; 4523 else if (T->isAtomicType()) 4524 DisallowedKind = 4; 4525 else if (T.hasQualifiers()) 4526 DisallowedKind = 5; 4527 else if (!T.isTriviallyCopyableType(Context)) 4528 // Some other non-trivially-copyable type (probably a C++ class) 4529 DisallowedKind = 6; 4530 4531 if (DisallowedKind != -1) { 4532 Diag(Loc, diag::err_atomic_specifier_bad_type) << DisallowedKind << T; 4533 return QualType(); 4534 } 4535 4536 // FIXME: Do we need any handling for ARC here? 4537 } 4538 4539 // Build the pointer type. 4540 return Context.getAtomicType(T); 4541} 4542