SemaType.cpp revision ab41fe914f63bb470dfa7e400876ada72f57a931
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_objc_gc: 63 diagID = diag::warn_pointer_attribute_wrong_type; 64 useExpansionLoc = true; 65 break; 66 67 case AttributeList::AT_objc_ownership: 68 diagID = diag::warn_objc_object_attribute_wrong_type; 69 useExpansionLoc = true; 70 break; 71 72 default: 73 // Assume everything else was a function attribute. 74 diagID = diag::warn_function_attribute_wrong_type; 75 break; 76 } 77 78 SourceLocation loc = attr.getLoc(); 79 StringRef name = attr.getName()->getName(); 80 81 // The GC attributes are usually written with macros; special-case them. 82 if (useExpansionLoc && loc.isMacroID() && attr.getParameterName()) { 83 if (attr.getParameterName()->isStr("strong")) { 84 if (S.findMacroSpelling(loc, "__strong")) name = "__strong"; 85 } else if (attr.getParameterName()->isStr("weak")) { 86 if (S.findMacroSpelling(loc, "__weak")) name = "__weak"; 87 } 88 } 89 90 S.Diag(loc, diagID) << name << type; 91} 92 93// objc_gc applies to Objective-C pointers or, otherwise, to the 94// smallest available pointer type (i.e. 'void*' in 'void**'). 95#define OBJC_POINTER_TYPE_ATTRS_CASELIST \ 96 case AttributeList::AT_objc_gc: \ 97 case AttributeList::AT_objc_ownership 98 99// Function type attributes. 100#define FUNCTION_TYPE_ATTRS_CASELIST \ 101 case AttributeList::AT_noreturn: \ 102 case AttributeList::AT_cdecl: \ 103 case AttributeList::AT_fastcall: \ 104 case AttributeList::AT_stdcall: \ 105 case AttributeList::AT_thiscall: \ 106 case AttributeList::AT_pascal: \ 107 case AttributeList::AT_regparm: \ 108 case AttributeList::AT_pcs \ 109 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_objc_gc) 288 return handleObjCGCTypeAttr(state, attr, type); 289 assert(attr.getKind() == AttributeList::AT_objc_ownership); 290 return handleObjCOwnershipTypeAttr(state, attr, type); 291} 292 293/// Given that an objc_gc attribute was written somewhere on a 294/// declaration *other* than on the declarator itself (for which, use 295/// distributeObjCPointerTypeAttrFromDeclarator), and given that it 296/// didn't apply in whatever position it was written in, try to move 297/// it to a more appropriate position. 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_ns_returns_retained: 509 if (!state.getSema().getLangOpts().ObjCAutoRefCount) 510 break; 511 // fallthrough 512 513 FUNCTION_TYPE_ATTRS_CASELIST: 514 distributeFunctionTypeAttrFromDeclarator(state, *attr, declSpecType); 515 break; 516 517 default: 518 break; 519 } 520 } while ((attr = next)); 521} 522 523/// Add a synthetic '()' to a block-literal declarator if it is 524/// required, given the return type. 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 D the declarator containing the declaration specifier. 577/// \returns The type described by the declaration specifiers. This function 578/// never returns null. 579static QualType ConvertDeclSpecToType(TypeProcessingState &state) { 580 // FIXME: Should move the logic from DeclSpec::Finish to here for validity 581 // checking. 582 583 Sema &S = state.getSema(); 584 Declarator &declarator = state.getDeclarator(); 585 const DeclSpec &DS = declarator.getDeclSpec(); 586 SourceLocation DeclLoc = declarator.getIdentifierLoc(); 587 if (DeclLoc.isInvalid()) 588 DeclLoc = DS.getLocStart(); 589 590 ASTContext &Context = S.Context; 591 592 QualType Result; 593 switch (DS.getTypeSpecType()) { 594 case DeclSpec::TST_void: 595 Result = Context.VoidTy; 596 break; 597 case DeclSpec::TST_char: 598 if (DS.getTypeSpecSign() == DeclSpec::TSS_unspecified) 599 Result = Context.CharTy; 600 else if (DS.getTypeSpecSign() == DeclSpec::TSS_signed) 601 Result = Context.SignedCharTy; 602 else { 603 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unsigned && 604 "Unknown TSS value"); 605 Result = Context.UnsignedCharTy; 606 } 607 break; 608 case DeclSpec::TST_wchar: 609 if (DS.getTypeSpecSign() == DeclSpec::TSS_unspecified) 610 Result = Context.WCharTy; 611 else if (DS.getTypeSpecSign() == DeclSpec::TSS_signed) { 612 S.Diag(DS.getTypeSpecSignLoc(), diag::ext_invalid_sign_spec) 613 << DS.getSpecifierName(DS.getTypeSpecType()); 614 Result = Context.getSignedWCharType(); 615 } else { 616 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unsigned && 617 "Unknown TSS value"); 618 S.Diag(DS.getTypeSpecSignLoc(), diag::ext_invalid_sign_spec) 619 << DS.getSpecifierName(DS.getTypeSpecType()); 620 Result = Context.getUnsignedWCharType(); 621 } 622 break; 623 case DeclSpec::TST_char16: 624 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unspecified && 625 "Unknown TSS value"); 626 Result = Context.Char16Ty; 627 break; 628 case DeclSpec::TST_char32: 629 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unspecified && 630 "Unknown TSS value"); 631 Result = Context.Char32Ty; 632 break; 633 case DeclSpec::TST_unspecified: 634 // "<proto1,proto2>" is an objc qualified ID with a missing id. 635 if (DeclSpec::ProtocolQualifierListTy PQ = DS.getProtocolQualifiers()) { 636 Result = Context.getObjCObjectType(Context.ObjCBuiltinIdTy, 637 (ObjCProtocolDecl**)PQ, 638 DS.getNumProtocolQualifiers()); 639 Result = Context.getObjCObjectPointerType(Result); 640 break; 641 } 642 643 // If this is a missing declspec in a block literal return context, then it 644 // is inferred from the return statements inside the block. 645 // The declspec is always missing in a lambda expr context; it is either 646 // specified with a trailing return type or inferred. 647 if (declarator.getContext() == Declarator::LambdaExprContext || 648 isOmittedBlockReturnType(declarator)) { 649 Result = Context.DependentTy; 650 break; 651 } 652 653 // Unspecified typespec defaults to int in C90. However, the C90 grammar 654 // [C90 6.5] only allows a decl-spec if there was *some* type-specifier, 655 // type-qualifier, or storage-class-specifier. If not, emit an extwarn. 656 // Note that the one exception to this is function definitions, which are 657 // allowed to be completely missing a declspec. This is handled in the 658 // parser already though by it pretending to have seen an 'int' in this 659 // case. 660 if (S.getLangOpts().ImplicitInt) { 661 // In C89 mode, we only warn if there is a completely missing declspec 662 // when one is not allowed. 663 if (DS.isEmpty()) { 664 S.Diag(DeclLoc, diag::ext_missing_declspec) 665 << DS.getSourceRange() 666 << FixItHint::CreateInsertion(DS.getLocStart(), "int"); 667 } 668 } else if (!DS.hasTypeSpecifier()) { 669 // C99 and C++ require a type specifier. For example, C99 6.7.2p2 says: 670 // "At least one type specifier shall be given in the declaration 671 // specifiers in each declaration, and in the specifier-qualifier list in 672 // each struct declaration and type name." 673 // FIXME: Does Microsoft really have the implicit int extension in C++? 674 if (S.getLangOpts().CPlusPlus && 675 !S.getLangOpts().MicrosoftExt) { 676 S.Diag(DeclLoc, diag::err_missing_type_specifier) 677 << DS.getSourceRange(); 678 679 // When this occurs in C++ code, often something is very broken with the 680 // value being declared, poison it as invalid so we don't get chains of 681 // errors. 682 declarator.setInvalidType(true); 683 } else { 684 S.Diag(DeclLoc, diag::ext_missing_type_specifier) 685 << DS.getSourceRange(); 686 } 687 } 688 689 // FALL THROUGH. 690 case DeclSpec::TST_int: { 691 if (DS.getTypeSpecSign() != DeclSpec::TSS_unsigned) { 692 switch (DS.getTypeSpecWidth()) { 693 case DeclSpec::TSW_unspecified: Result = Context.IntTy; break; 694 case DeclSpec::TSW_short: Result = Context.ShortTy; break; 695 case DeclSpec::TSW_long: Result = Context.LongTy; break; 696 case DeclSpec::TSW_longlong: 697 Result = Context.LongLongTy; 698 699 // long long is a C99 feature. 700 if (!S.getLangOpts().C99) 701 S.Diag(DS.getTypeSpecWidthLoc(), 702 S.getLangOpts().CPlusPlus0x ? 703 diag::warn_cxx98_compat_longlong : diag::ext_longlong); 704 break; 705 } 706 } else { 707 switch (DS.getTypeSpecWidth()) { 708 case DeclSpec::TSW_unspecified: Result = Context.UnsignedIntTy; break; 709 case DeclSpec::TSW_short: Result = Context.UnsignedShortTy; break; 710 case DeclSpec::TSW_long: Result = Context.UnsignedLongTy; break; 711 case DeclSpec::TSW_longlong: 712 Result = Context.UnsignedLongLongTy; 713 714 // long long is a C99 feature. 715 if (!S.getLangOpts().C99) 716 S.Diag(DS.getTypeSpecWidthLoc(), 717 S.getLangOpts().CPlusPlus0x ? 718 diag::warn_cxx98_compat_longlong : diag::ext_longlong); 719 break; 720 } 721 } 722 break; 723 } 724 case DeclSpec::TST_int128: 725 if (DS.getTypeSpecSign() == DeclSpec::TSS_unsigned) 726 Result = Context.UnsignedInt128Ty; 727 else 728 Result = Context.Int128Ty; 729 break; 730 case DeclSpec::TST_half: Result = Context.HalfTy; break; 731 case DeclSpec::TST_float: Result = Context.FloatTy; break; 732 case DeclSpec::TST_double: 733 if (DS.getTypeSpecWidth() == DeclSpec::TSW_long) 734 Result = Context.LongDoubleTy; 735 else 736 Result = Context.DoubleTy; 737 738 if (S.getLangOpts().OpenCL && !S.getOpenCLOptions().cl_khr_fp64) { 739 S.Diag(DS.getTypeSpecTypeLoc(), diag::err_double_requires_fp64); 740 declarator.setInvalidType(true); 741 } 742 break; 743 case DeclSpec::TST_bool: Result = Context.BoolTy; break; // _Bool or bool 744 case DeclSpec::TST_decimal32: // _Decimal32 745 case DeclSpec::TST_decimal64: // _Decimal64 746 case DeclSpec::TST_decimal128: // _Decimal128 747 S.Diag(DS.getTypeSpecTypeLoc(), diag::err_decimal_unsupported); 748 Result = Context.IntTy; 749 declarator.setInvalidType(true); 750 break; 751 case DeclSpec::TST_class: 752 case DeclSpec::TST_enum: 753 case DeclSpec::TST_union: 754 case DeclSpec::TST_struct: { 755 TypeDecl *D = dyn_cast_or_null<TypeDecl>(DS.getRepAsDecl()); 756 if (!D) { 757 // This can happen in C++ with ambiguous lookups. 758 Result = Context.IntTy; 759 declarator.setInvalidType(true); 760 break; 761 } 762 763 // If the type is deprecated or unavailable, diagnose it. 764 S.DiagnoseUseOfDecl(D, DS.getTypeSpecTypeNameLoc()); 765 766 assert(DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 && 767 DS.getTypeSpecSign() == 0 && "No qualifiers on tag names!"); 768 769 // TypeQuals handled by caller. 770 Result = Context.getTypeDeclType(D); 771 772 // In both C and C++, make an ElaboratedType. 773 ElaboratedTypeKeyword Keyword 774 = ElaboratedType::getKeywordForTypeSpec(DS.getTypeSpecType()); 775 Result = S.getElaboratedType(Keyword, DS.getTypeSpecScope(), Result); 776 break; 777 } 778 case DeclSpec::TST_typename: { 779 assert(DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 && 780 DS.getTypeSpecSign() == 0 && 781 "Can't handle qualifiers on typedef names yet!"); 782 Result = S.GetTypeFromParser(DS.getRepAsType()); 783 if (Result.isNull()) 784 declarator.setInvalidType(true); 785 else if (DeclSpec::ProtocolQualifierListTy PQ 786 = DS.getProtocolQualifiers()) { 787 if (const ObjCObjectType *ObjT = Result->getAs<ObjCObjectType>()) { 788 // Silently drop any existing protocol qualifiers. 789 // TODO: determine whether that's the right thing to do. 790 if (ObjT->getNumProtocols()) 791 Result = ObjT->getBaseType(); 792 793 if (DS.getNumProtocolQualifiers()) 794 Result = Context.getObjCObjectType(Result, 795 (ObjCProtocolDecl**) PQ, 796 DS.getNumProtocolQualifiers()); 797 } else if (Result->isObjCIdType()) { 798 // id<protocol-list> 799 Result = Context.getObjCObjectType(Context.ObjCBuiltinIdTy, 800 (ObjCProtocolDecl**) PQ, 801 DS.getNumProtocolQualifiers()); 802 Result = Context.getObjCObjectPointerType(Result); 803 } else if (Result->isObjCClassType()) { 804 // Class<protocol-list> 805 Result = Context.getObjCObjectType(Context.ObjCBuiltinClassTy, 806 (ObjCProtocolDecl**) PQ, 807 DS.getNumProtocolQualifiers()); 808 Result = Context.getObjCObjectPointerType(Result); 809 } else { 810 S.Diag(DeclLoc, diag::err_invalid_protocol_qualifiers) 811 << DS.getSourceRange(); 812 declarator.setInvalidType(true); 813 } 814 } 815 816 // TypeQuals handled by caller. 817 break; 818 } 819 case DeclSpec::TST_typeofType: 820 // FIXME: Preserve type source info. 821 Result = S.GetTypeFromParser(DS.getRepAsType()); 822 assert(!Result.isNull() && "Didn't get a type for typeof?"); 823 if (!Result->isDependentType()) 824 if (const TagType *TT = Result->getAs<TagType>()) 825 S.DiagnoseUseOfDecl(TT->getDecl(), DS.getTypeSpecTypeLoc()); 826 // TypeQuals handled by caller. 827 Result = Context.getTypeOfType(Result); 828 break; 829 case DeclSpec::TST_typeofExpr: { 830 Expr *E = DS.getRepAsExpr(); 831 assert(E && "Didn't get an expression for typeof?"); 832 // TypeQuals handled by caller. 833 Result = S.BuildTypeofExprType(E, DS.getTypeSpecTypeLoc()); 834 if (Result.isNull()) { 835 Result = Context.IntTy; 836 declarator.setInvalidType(true); 837 } 838 break; 839 } 840 case DeclSpec::TST_decltype: { 841 Expr *E = DS.getRepAsExpr(); 842 assert(E && "Didn't get an expression for decltype?"); 843 // TypeQuals handled by caller. 844 Result = S.BuildDecltypeType(E, DS.getTypeSpecTypeLoc()); 845 if (Result.isNull()) { 846 Result = Context.IntTy; 847 declarator.setInvalidType(true); 848 } 849 break; 850 } 851 case DeclSpec::TST_underlyingType: 852 Result = S.GetTypeFromParser(DS.getRepAsType()); 853 assert(!Result.isNull() && "Didn't get a type for __underlying_type?"); 854 Result = S.BuildUnaryTransformType(Result, 855 UnaryTransformType::EnumUnderlyingType, 856 DS.getTypeSpecTypeLoc()); 857 if (Result.isNull()) { 858 Result = Context.IntTy; 859 declarator.setInvalidType(true); 860 } 861 break; 862 863 case DeclSpec::TST_auto: { 864 // TypeQuals handled by caller. 865 Result = Context.getAutoType(QualType()); 866 break; 867 } 868 869 case DeclSpec::TST_unknown_anytype: 870 Result = Context.UnknownAnyTy; 871 break; 872 873 case DeclSpec::TST_atomic: 874 Result = S.GetTypeFromParser(DS.getRepAsType()); 875 assert(!Result.isNull() && "Didn't get a type for _Atomic?"); 876 Result = S.BuildAtomicType(Result, DS.getTypeSpecTypeLoc()); 877 if (Result.isNull()) { 878 Result = Context.IntTy; 879 declarator.setInvalidType(true); 880 } 881 break; 882 883 case DeclSpec::TST_error: 884 Result = Context.IntTy; 885 declarator.setInvalidType(true); 886 break; 887 } 888 889 // Handle complex types. 890 if (DS.getTypeSpecComplex() == DeclSpec::TSC_complex) { 891 if (S.getLangOpts().Freestanding) 892 S.Diag(DS.getTypeSpecComplexLoc(), diag::ext_freestanding_complex); 893 Result = Context.getComplexType(Result); 894 } else if (DS.isTypeAltiVecVector()) { 895 unsigned typeSize = static_cast<unsigned>(Context.getTypeSize(Result)); 896 assert(typeSize > 0 && "type size for vector must be greater than 0 bits"); 897 VectorType::VectorKind VecKind = VectorType::AltiVecVector; 898 if (DS.isTypeAltiVecPixel()) 899 VecKind = VectorType::AltiVecPixel; 900 else if (DS.isTypeAltiVecBool()) 901 VecKind = VectorType::AltiVecBool; 902 Result = Context.getVectorType(Result, 128/typeSize, VecKind); 903 } 904 905 // FIXME: Imaginary. 906 if (DS.getTypeSpecComplex() == DeclSpec::TSC_imaginary) 907 S.Diag(DS.getTypeSpecComplexLoc(), diag::err_imaginary_not_supported); 908 909 // Before we process any type attributes, synthesize a block literal 910 // function declarator if necessary. 911 if (declarator.getContext() == Declarator::BlockLiteralContext) 912 maybeSynthesizeBlockSignature(state, Result); 913 914 // Apply any type attributes from the decl spec. This may cause the 915 // list of type attributes to be temporarily saved while the type 916 // attributes are pushed around. 917 if (AttributeList *attrs = DS.getAttributes().getList()) 918 processTypeAttrs(state, Result, true, attrs); 919 920 // Apply const/volatile/restrict qualifiers to T. 921 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 922 923 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 924 // or incomplete types shall not be restrict-qualified." C++ also allows 925 // restrict-qualified references. 926 if (TypeQuals & DeclSpec::TQ_restrict) { 927 if (Result->isAnyPointerType() || Result->isReferenceType()) { 928 QualType EltTy; 929 if (Result->isObjCObjectPointerType()) 930 EltTy = Result; 931 else 932 EltTy = Result->isPointerType() ? 933 Result->getAs<PointerType>()->getPointeeType() : 934 Result->getAs<ReferenceType>()->getPointeeType(); 935 936 // If we have a pointer or reference, the pointee must have an object 937 // incomplete type. 938 if (!EltTy->isIncompleteOrObjectType()) { 939 S.Diag(DS.getRestrictSpecLoc(), 940 diag::err_typecheck_invalid_restrict_invalid_pointee) 941 << EltTy << DS.getSourceRange(); 942 TypeQuals &= ~DeclSpec::TQ_restrict; // Remove the restrict qualifier. 943 } 944 } else { 945 S.Diag(DS.getRestrictSpecLoc(), 946 diag::err_typecheck_invalid_restrict_not_pointer) 947 << Result << DS.getSourceRange(); 948 TypeQuals &= ~DeclSpec::TQ_restrict; // Remove the restrict qualifier. 949 } 950 } 951 952 // Warn about CV qualifiers on functions: C99 6.7.3p8: "If the specification 953 // of a function type includes any type qualifiers, the behavior is 954 // undefined." 955 if (Result->isFunctionType() && TypeQuals) { 956 // Get some location to point at, either the C or V location. 957 SourceLocation Loc; 958 if (TypeQuals & DeclSpec::TQ_const) 959 Loc = DS.getConstSpecLoc(); 960 else if (TypeQuals & DeclSpec::TQ_volatile) 961 Loc = DS.getVolatileSpecLoc(); 962 else { 963 assert((TypeQuals & DeclSpec::TQ_restrict) && 964 "Has CVR quals but not C, V, or R?"); 965 Loc = DS.getRestrictSpecLoc(); 966 } 967 S.Diag(Loc, diag::warn_typecheck_function_qualifiers) 968 << Result << DS.getSourceRange(); 969 } 970 971 // C++ [dcl.ref]p1: 972 // Cv-qualified references are ill-formed except when the 973 // cv-qualifiers are introduced through the use of a typedef 974 // (7.1.3) or of a template type argument (14.3), in which 975 // case the cv-qualifiers are ignored. 976 // FIXME: Shouldn't we be checking SCS_typedef here? 977 if (DS.getTypeSpecType() == DeclSpec::TST_typename && 978 TypeQuals && Result->isReferenceType()) { 979 TypeQuals &= ~DeclSpec::TQ_const; 980 TypeQuals &= ~DeclSpec::TQ_volatile; 981 } 982 983 // C90 6.5.3 constraints: "The same type qualifier shall not appear more 984 // than once in the same specifier-list or qualifier-list, either directly 985 // or via one or more typedefs." 986 if (!S.getLangOpts().C99 && !S.getLangOpts().CPlusPlus 987 && TypeQuals & Result.getCVRQualifiers()) { 988 if (TypeQuals & DeclSpec::TQ_const && Result.isConstQualified()) { 989 S.Diag(DS.getConstSpecLoc(), diag::ext_duplicate_declspec) 990 << "const"; 991 } 992 993 if (TypeQuals & DeclSpec::TQ_volatile && Result.isVolatileQualified()) { 994 S.Diag(DS.getVolatileSpecLoc(), diag::ext_duplicate_declspec) 995 << "volatile"; 996 } 997 998 // C90 doesn't have restrict, so it doesn't force us to produce a warning 999 // in this case. 1000 } 1001 1002 Qualifiers Quals = Qualifiers::fromCVRMask(TypeQuals); 1003 Result = Context.getQualifiedType(Result, Quals); 1004 } 1005 1006 return Result; 1007} 1008 1009static std::string getPrintableNameForEntity(DeclarationName Entity) { 1010 if (Entity) 1011 return Entity.getAsString(); 1012 1013 return "type name"; 1014} 1015 1016QualType Sema::BuildQualifiedType(QualType T, SourceLocation Loc, 1017 Qualifiers Qs) { 1018 // Enforce C99 6.7.3p2: "Types other than pointer types derived from 1019 // object or incomplete types shall not be restrict-qualified." 1020 if (Qs.hasRestrict()) { 1021 unsigned DiagID = 0; 1022 QualType ProblemTy; 1023 1024 const Type *Ty = T->getCanonicalTypeInternal().getTypePtr(); 1025 if (const ReferenceType *RTy = dyn_cast<ReferenceType>(Ty)) { 1026 if (!RTy->getPointeeType()->isIncompleteOrObjectType()) { 1027 DiagID = diag::err_typecheck_invalid_restrict_invalid_pointee; 1028 ProblemTy = T->getAs<ReferenceType>()->getPointeeType(); 1029 } 1030 } else if (const PointerType *PTy = dyn_cast<PointerType>(Ty)) { 1031 if (!PTy->getPointeeType()->isIncompleteOrObjectType()) { 1032 DiagID = diag::err_typecheck_invalid_restrict_invalid_pointee; 1033 ProblemTy = T->getAs<PointerType>()->getPointeeType(); 1034 } 1035 } else if (const MemberPointerType *PTy = dyn_cast<MemberPointerType>(Ty)) { 1036 if (!PTy->getPointeeType()->isIncompleteOrObjectType()) { 1037 DiagID = diag::err_typecheck_invalid_restrict_invalid_pointee; 1038 ProblemTy = T->getAs<PointerType>()->getPointeeType(); 1039 } 1040 } else if (!Ty->isDependentType()) { 1041 // FIXME: this deserves a proper diagnostic 1042 DiagID = diag::err_typecheck_invalid_restrict_invalid_pointee; 1043 ProblemTy = T; 1044 } 1045 1046 if (DiagID) { 1047 Diag(Loc, DiagID) << ProblemTy; 1048 Qs.removeRestrict(); 1049 } 1050 } 1051 1052 return Context.getQualifiedType(T, Qs); 1053} 1054 1055/// \brief Build a paren type including \p T. 1056QualType Sema::BuildParenType(QualType T) { 1057 return Context.getParenType(T); 1058} 1059 1060/// Given that we're building a pointer or reference to the given 1061static QualType inferARCLifetimeForPointee(Sema &S, QualType type, 1062 SourceLocation loc, 1063 bool isReference) { 1064 // Bail out if retention is unrequired or already specified. 1065 if (!type->isObjCLifetimeType() || 1066 type.getObjCLifetime() != Qualifiers::OCL_None) 1067 return type; 1068 1069 Qualifiers::ObjCLifetime implicitLifetime = Qualifiers::OCL_None; 1070 1071 // If the object type is const-qualified, we can safely use 1072 // __unsafe_unretained. This is safe (because there are no read 1073 // barriers), and it'll be safe to coerce anything but __weak* to 1074 // the resulting type. 1075 if (type.isConstQualified()) { 1076 implicitLifetime = Qualifiers::OCL_ExplicitNone; 1077 1078 // Otherwise, check whether the static type does not require 1079 // retaining. This currently only triggers for Class (possibly 1080 // protocol-qualifed, and arrays thereof). 1081 } else if (type->isObjCARCImplicitlyUnretainedType()) { 1082 implicitLifetime = Qualifiers::OCL_ExplicitNone; 1083 1084 // If we are in an unevaluated context, like sizeof, skip adding a 1085 // qualification. 1086 } else if (S.ExprEvalContexts.back().Context == Sema::Unevaluated) { 1087 return type; 1088 1089 // If that failed, give an error and recover using __strong. __strong 1090 // is the option most likely to prevent spurious second-order diagnostics, 1091 // like when binding a reference to a field. 1092 } else { 1093 // These types can show up in private ivars in system headers, so 1094 // we need this to not be an error in those cases. Instead we 1095 // want to delay. 1096 if (S.DelayedDiagnostics.shouldDelayDiagnostics()) { 1097 S.DelayedDiagnostics.add( 1098 sema::DelayedDiagnostic::makeForbiddenType(loc, 1099 diag::err_arc_indirect_no_ownership, type, isReference)); 1100 } else { 1101 S.Diag(loc, diag::err_arc_indirect_no_ownership) << type << isReference; 1102 } 1103 implicitLifetime = Qualifiers::OCL_Strong; 1104 } 1105 assert(implicitLifetime && "didn't infer any lifetime!"); 1106 1107 Qualifiers qs; 1108 qs.addObjCLifetime(implicitLifetime); 1109 return S.Context.getQualifiedType(type, qs); 1110} 1111 1112/// \brief Build a pointer type. 1113/// 1114/// \param T The type to which we'll be building a pointer. 1115/// 1116/// \param Loc The location of the entity whose type involves this 1117/// pointer type or, if there is no such entity, the location of the 1118/// type that will have pointer type. 1119/// 1120/// \param Entity The name of the entity that involves the pointer 1121/// type, if known. 1122/// 1123/// \returns A suitable pointer type, if there are no 1124/// errors. Otherwise, returns a NULL type. 1125QualType Sema::BuildPointerType(QualType T, 1126 SourceLocation Loc, DeclarationName Entity) { 1127 if (T->isReferenceType()) { 1128 // C++ 8.3.2p4: There shall be no ... pointers to references ... 1129 Diag(Loc, diag::err_illegal_decl_pointer_to_reference) 1130 << getPrintableNameForEntity(Entity) << T; 1131 return QualType(); 1132 } 1133 1134 assert(!T->isObjCObjectType() && "Should build ObjCObjectPointerType"); 1135 1136 // In ARC, it is forbidden to build pointers to unqualified pointers. 1137 if (getLangOpts().ObjCAutoRefCount) 1138 T = inferARCLifetimeForPointee(*this, T, Loc, /*reference*/ false); 1139 1140 // Build the pointer type. 1141 return Context.getPointerType(T); 1142} 1143 1144/// \brief Build a reference type. 1145/// 1146/// \param T The type to which we'll be building a reference. 1147/// 1148/// \param Loc The location of the entity whose type involves this 1149/// reference type or, if there is no such entity, the location of the 1150/// type that will have reference type. 1151/// 1152/// \param Entity The name of the entity that involves the reference 1153/// type, if known. 1154/// 1155/// \returns A suitable reference type, if there are no 1156/// errors. Otherwise, returns a NULL type. 1157QualType Sema::BuildReferenceType(QualType T, bool SpelledAsLValue, 1158 SourceLocation Loc, 1159 DeclarationName Entity) { 1160 assert(Context.getCanonicalType(T) != Context.OverloadTy && 1161 "Unresolved overloaded function type"); 1162 1163 // C++0x [dcl.ref]p6: 1164 // If a typedef (7.1.3), a type template-parameter (14.3.1), or a 1165 // decltype-specifier (7.1.6.2) denotes a type TR that is a reference to a 1166 // type T, an attempt to create the type "lvalue reference to cv TR" creates 1167 // the type "lvalue reference to T", while an attempt to create the type 1168 // "rvalue reference to cv TR" creates the type TR. 1169 bool LValueRef = SpelledAsLValue || T->getAs<LValueReferenceType>(); 1170 1171 // C++ [dcl.ref]p4: There shall be no references to references. 1172 // 1173 // According to C++ DR 106, references to references are only 1174 // diagnosed when they are written directly (e.g., "int & &"), 1175 // but not when they happen via a typedef: 1176 // 1177 // typedef int& intref; 1178 // typedef intref& intref2; 1179 // 1180 // Parser::ParseDeclaratorInternal diagnoses the case where 1181 // references are written directly; here, we handle the 1182 // collapsing of references-to-references as described in C++0x. 1183 // DR 106 and 540 introduce reference-collapsing into C++98/03. 1184 1185 // C++ [dcl.ref]p1: 1186 // A declarator that specifies the type "reference to cv void" 1187 // is ill-formed. 1188 if (T->isVoidType()) { 1189 Diag(Loc, diag::err_reference_to_void); 1190 return QualType(); 1191 } 1192 1193 // In ARC, it is forbidden to build references to unqualified pointers. 1194 if (getLangOpts().ObjCAutoRefCount) 1195 T = inferARCLifetimeForPointee(*this, T, Loc, /*reference*/ true); 1196 1197 // Handle restrict on references. 1198 if (LValueRef) 1199 return Context.getLValueReferenceType(T, SpelledAsLValue); 1200 return Context.getRValueReferenceType(T); 1201} 1202 1203/// Check whether the specified array size makes the array type a VLA. If so, 1204/// return true, if not, return the size of the array in SizeVal. 1205static bool isArraySizeVLA(Sema &S, Expr *ArraySize, llvm::APSInt &SizeVal) { 1206 // If the size is an ICE, it certainly isn't a VLA. If we're in a GNU mode 1207 // (like gnu99, but not c99) accept any evaluatable value as an extension. 1208 class VLADiagnoser : public Sema::VerifyICEDiagnoser { 1209 public: 1210 VLADiagnoser() : Sema::VerifyICEDiagnoser(true) {} 1211 1212 virtual void diagnoseNotICE(Sema &S, SourceLocation Loc, SourceRange SR) { 1213 } 1214 1215 virtual void diagnoseFold(Sema &S, SourceLocation Loc, SourceRange SR) { 1216 S.Diag(Loc, diag::ext_vla_folded_to_constant) << SR; 1217 } 1218 } Diagnoser; 1219 1220 return S.VerifyIntegerConstantExpression(ArraySize, &SizeVal, Diagnoser, 1221 S.LangOpts.GNUMode).isInvalid(); 1222} 1223 1224 1225/// \brief Build an array type. 1226/// 1227/// \param T The type of each element in the array. 1228/// 1229/// \param ASM C99 array size modifier (e.g., '*', 'static'). 1230/// 1231/// \param ArraySize Expression describing the size of the array. 1232/// 1233/// \param Loc The location of the entity whose type involves this 1234/// array type or, if there is no such entity, the location of the 1235/// type that will have array type. 1236/// 1237/// \param Entity The name of the entity that involves the array 1238/// type, if known. 1239/// 1240/// \returns A suitable array type, if there are no errors. Otherwise, 1241/// returns a NULL type. 1242QualType Sema::BuildArrayType(QualType T, ArrayType::ArraySizeModifier ASM, 1243 Expr *ArraySize, unsigned Quals, 1244 SourceRange Brackets, DeclarationName Entity) { 1245 1246 SourceLocation Loc = Brackets.getBegin(); 1247 if (getLangOpts().CPlusPlus) { 1248 // C++ [dcl.array]p1: 1249 // T is called the array element type; this type shall not be a reference 1250 // type, the (possibly cv-qualified) type void, a function type or an 1251 // abstract class type. 1252 // 1253 // Note: function types are handled in the common path with C. 1254 if (T->isReferenceType()) { 1255 Diag(Loc, diag::err_illegal_decl_array_of_references) 1256 << getPrintableNameForEntity(Entity) << T; 1257 return QualType(); 1258 } 1259 1260 if (T->isVoidType()) { 1261 Diag(Loc, diag::err_illegal_decl_array_incomplete_type) << T; 1262 return QualType(); 1263 } 1264 1265 if (RequireNonAbstractType(Brackets.getBegin(), T, 1266 diag::err_array_of_abstract_type)) 1267 return QualType(); 1268 1269 } else { 1270 // C99 6.7.5.2p1: If the element type is an incomplete or function type, 1271 // reject it (e.g. void ary[7], struct foo ary[7], void ary[7]()) 1272 if (RequireCompleteType(Loc, T, 1273 diag::err_illegal_decl_array_incomplete_type)) 1274 return QualType(); 1275 } 1276 1277 if (T->isFunctionType()) { 1278 Diag(Loc, diag::err_illegal_decl_array_of_functions) 1279 << getPrintableNameForEntity(Entity) << T; 1280 return QualType(); 1281 } 1282 1283 if (T->getContainedAutoType()) { 1284 Diag(Loc, diag::err_illegal_decl_array_of_auto) 1285 << getPrintableNameForEntity(Entity) << T; 1286 return QualType(); 1287 } 1288 1289 if (const RecordType *EltTy = T->getAs<RecordType>()) { 1290 // If the element type is a struct or union that contains a variadic 1291 // array, accept it as a GNU extension: C99 6.7.2.1p2. 1292 if (EltTy->getDecl()->hasFlexibleArrayMember()) 1293 Diag(Loc, diag::ext_flexible_array_in_array) << T; 1294 } else if (T->isObjCObjectType()) { 1295 Diag(Loc, diag::err_objc_array_of_interfaces) << T; 1296 return QualType(); 1297 } 1298 1299 // Do placeholder conversions on the array size expression. 1300 if (ArraySize && ArraySize->hasPlaceholderType()) { 1301 ExprResult Result = CheckPlaceholderExpr(ArraySize); 1302 if (Result.isInvalid()) return QualType(); 1303 ArraySize = Result.take(); 1304 } 1305 1306 // Do lvalue-to-rvalue conversions on the array size expression. 1307 if (ArraySize && !ArraySize->isRValue()) { 1308 ExprResult Result = DefaultLvalueConversion(ArraySize); 1309 if (Result.isInvalid()) 1310 return QualType(); 1311 1312 ArraySize = Result.take(); 1313 } 1314 1315 // C99 6.7.5.2p1: The size expression shall have integer type. 1316 // C++11 allows contextual conversions to such types. 1317 if (!getLangOpts().CPlusPlus0x && 1318 ArraySize && !ArraySize->isTypeDependent() && 1319 !ArraySize->getType()->isIntegralOrUnscopedEnumerationType()) { 1320 Diag(ArraySize->getLocStart(), diag::err_array_size_non_int) 1321 << ArraySize->getType() << ArraySize->getSourceRange(); 1322 return QualType(); 1323 } 1324 1325 llvm::APSInt ConstVal(Context.getTypeSize(Context.getSizeType())); 1326 if (!ArraySize) { 1327 if (ASM == ArrayType::Star) 1328 T = Context.getVariableArrayType(T, 0, ASM, Quals, Brackets); 1329 else 1330 T = Context.getIncompleteArrayType(T, ASM, Quals); 1331 } else if (ArraySize->isTypeDependent() || ArraySize->isValueDependent()) { 1332 T = Context.getDependentSizedArrayType(T, ArraySize, ASM, Quals, Brackets); 1333 } else if ((!T->isDependentType() && !T->isIncompleteType() && 1334 !T->isConstantSizeType()) || 1335 isArraySizeVLA(*this, ArraySize, ConstVal)) { 1336 // Even in C++11, don't allow contextual conversions in the array bound 1337 // of a VLA. 1338 if (getLangOpts().CPlusPlus0x && 1339 !ArraySize->getType()->isIntegralOrUnscopedEnumerationType()) { 1340 Diag(ArraySize->getLocStart(), diag::err_array_size_non_int) 1341 << ArraySize->getType() << ArraySize->getSourceRange(); 1342 return QualType(); 1343 } 1344 1345 // C99: an array with an element type that has a non-constant-size is a VLA. 1346 // C99: an array with a non-ICE size is a VLA. We accept any expression 1347 // that we can fold to a non-zero positive value as an extension. 1348 T = Context.getVariableArrayType(T, ArraySize, ASM, Quals, Brackets); 1349 } else { 1350 // C99 6.7.5.2p1: If the expression is a constant expression, it shall 1351 // have a value greater than zero. 1352 if (ConstVal.isSigned() && ConstVal.isNegative()) { 1353 if (Entity) 1354 Diag(ArraySize->getLocStart(), diag::err_decl_negative_array_size) 1355 << getPrintableNameForEntity(Entity) << ArraySize->getSourceRange(); 1356 else 1357 Diag(ArraySize->getLocStart(), diag::err_typecheck_negative_array_size) 1358 << ArraySize->getSourceRange(); 1359 return QualType(); 1360 } 1361 if (ConstVal == 0) { 1362 // GCC accepts zero sized static arrays. We allow them when 1363 // we're not in a SFINAE context. 1364 Diag(ArraySize->getLocStart(), 1365 isSFINAEContext()? diag::err_typecheck_zero_array_size 1366 : diag::ext_typecheck_zero_array_size) 1367 << ArraySize->getSourceRange(); 1368 1369 if (ASM == ArrayType::Static) { 1370 Diag(ArraySize->getLocStart(), 1371 diag::warn_typecheck_zero_static_array_size) 1372 << ArraySize->getSourceRange(); 1373 ASM = ArrayType::Normal; 1374 } 1375 } else if (!T->isDependentType() && !T->isVariablyModifiedType() && 1376 !T->isIncompleteType()) { 1377 // Is the array too large? 1378 unsigned ActiveSizeBits 1379 = ConstantArrayType::getNumAddressingBits(Context, T, ConstVal); 1380 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) 1381 Diag(ArraySize->getLocStart(), diag::err_array_too_large) 1382 << ConstVal.toString(10) 1383 << ArraySize->getSourceRange(); 1384 } 1385 1386 T = Context.getConstantArrayType(T, ConstVal, ASM, Quals); 1387 } 1388 // If this is not C99, extwarn about VLA's and C99 array size modifiers. 1389 if (!getLangOpts().C99) { 1390 if (T->isVariableArrayType()) { 1391 // Prohibit the use of non-POD types in VLAs. 1392 QualType BaseT = Context.getBaseElementType(T); 1393 if (!T->isDependentType() && 1394 !BaseT.isPODType(Context) && 1395 !BaseT->isObjCLifetimeType()) { 1396 Diag(Loc, diag::err_vla_non_pod) 1397 << BaseT; 1398 return QualType(); 1399 } 1400 // Prohibit the use of VLAs during template argument deduction. 1401 else if (isSFINAEContext()) { 1402 Diag(Loc, diag::err_vla_in_sfinae); 1403 return QualType(); 1404 } 1405 // Just extwarn about VLAs. 1406 else 1407 Diag(Loc, diag::ext_vla); 1408 } else if (ASM != ArrayType::Normal || Quals != 0) 1409 Diag(Loc, 1410 getLangOpts().CPlusPlus? diag::err_c99_array_usage_cxx 1411 : diag::ext_c99_array_usage) << ASM; 1412 } 1413 1414 return T; 1415} 1416 1417/// \brief Build an ext-vector type. 1418/// 1419/// Run the required checks for the extended vector type. 1420QualType Sema::BuildExtVectorType(QualType T, Expr *ArraySize, 1421 SourceLocation AttrLoc) { 1422 // unlike gcc's vector_size attribute, we do not allow vectors to be defined 1423 // in conjunction with complex types (pointers, arrays, functions, etc.). 1424 if (!T->isDependentType() && 1425 !T->isIntegerType() && !T->isRealFloatingType()) { 1426 Diag(AttrLoc, diag::err_attribute_invalid_vector_type) << T; 1427 return QualType(); 1428 } 1429 1430 if (!ArraySize->isTypeDependent() && !ArraySize->isValueDependent()) { 1431 llvm::APSInt vecSize(32); 1432 if (!ArraySize->isIntegerConstantExpr(vecSize, Context)) { 1433 Diag(AttrLoc, diag::err_attribute_argument_not_int) 1434 << "ext_vector_type" << ArraySize->getSourceRange(); 1435 return QualType(); 1436 } 1437 1438 // unlike gcc's vector_size attribute, the size is specified as the 1439 // number of elements, not the number of bytes. 1440 unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue()); 1441 1442 if (vectorSize == 0) { 1443 Diag(AttrLoc, diag::err_attribute_zero_size) 1444 << ArraySize->getSourceRange(); 1445 return QualType(); 1446 } 1447 1448 return Context.getExtVectorType(T, vectorSize); 1449 } 1450 1451 return Context.getDependentSizedExtVectorType(T, ArraySize, AttrLoc); 1452} 1453 1454/// \brief Build a function type. 1455/// 1456/// This routine checks the function type according to C++ rules and 1457/// under the assumption that the result type and parameter types have 1458/// just been instantiated from a template. It therefore duplicates 1459/// some of the behavior of GetTypeForDeclarator, but in a much 1460/// simpler form that is only suitable for this narrow use case. 1461/// 1462/// \param T The return type of the function. 1463/// 1464/// \param ParamTypes The parameter types of the function. This array 1465/// will be modified to account for adjustments to the types of the 1466/// function parameters. 1467/// 1468/// \param NumParamTypes The number of parameter types in ParamTypes. 1469/// 1470/// \param Variadic Whether this is a variadic function type. 1471/// 1472/// \param HasTrailingReturn Whether this function has a trailing return type. 1473/// 1474/// \param Quals The cvr-qualifiers to be applied to the function type. 1475/// 1476/// \param Loc The location of the entity whose type involves this 1477/// function type or, if there is no such entity, the location of the 1478/// type that will have function type. 1479/// 1480/// \param Entity The name of the entity that involves the function 1481/// type, if known. 1482/// 1483/// \returns A suitable function type, if there are no 1484/// errors. Otherwise, returns a NULL type. 1485QualType Sema::BuildFunctionType(QualType T, 1486 QualType *ParamTypes, 1487 unsigned NumParamTypes, 1488 bool Variadic, bool HasTrailingReturn, 1489 unsigned Quals, 1490 RefQualifierKind RefQualifier, 1491 SourceLocation Loc, DeclarationName Entity, 1492 FunctionType::ExtInfo Info) { 1493 if (T->isArrayType() || T->isFunctionType()) { 1494 Diag(Loc, diag::err_func_returning_array_function) 1495 << T->isFunctionType() << T; 1496 return QualType(); 1497 } 1498 1499 // Functions cannot return half FP. 1500 if (T->isHalfType()) { 1501 Diag(Loc, diag::err_parameters_retval_cannot_have_fp16_type) << 1 << 1502 FixItHint::CreateInsertion(Loc, "*"); 1503 return QualType(); 1504 } 1505 1506 bool Invalid = false; 1507 for (unsigned Idx = 0; Idx < NumParamTypes; ++Idx) { 1508 // FIXME: Loc is too inprecise here, should use proper locations for args. 1509 QualType ParamType = Context.getAdjustedParameterType(ParamTypes[Idx]); 1510 if (ParamType->isVoidType()) { 1511 Diag(Loc, diag::err_param_with_void_type); 1512 Invalid = true; 1513 } else if (ParamType->isHalfType()) { 1514 // Disallow half FP arguments. 1515 Diag(Loc, diag::err_parameters_retval_cannot_have_fp16_type) << 0 << 1516 FixItHint::CreateInsertion(Loc, "*"); 1517 Invalid = true; 1518 } 1519 1520 ParamTypes[Idx] = ParamType; 1521 } 1522 1523 if (Invalid) 1524 return QualType(); 1525 1526 FunctionProtoType::ExtProtoInfo EPI; 1527 EPI.Variadic = Variadic; 1528 EPI.HasTrailingReturn = HasTrailingReturn; 1529 EPI.TypeQuals = Quals; 1530 EPI.RefQualifier = RefQualifier; 1531 EPI.ExtInfo = Info; 1532 1533 return Context.getFunctionType(T, ParamTypes, NumParamTypes, EPI); 1534} 1535 1536/// \brief Build a member pointer type \c T Class::*. 1537/// 1538/// \param T the type to which the member pointer refers. 1539/// \param Class the class type into which the member pointer points. 1540/// \param Loc the location where this type begins 1541/// \param Entity the name of the entity that will have this member pointer type 1542/// 1543/// \returns a member pointer type, if successful, or a NULL type if there was 1544/// an error. 1545QualType Sema::BuildMemberPointerType(QualType T, QualType Class, 1546 SourceLocation Loc, 1547 DeclarationName Entity) { 1548 // Verify that we're not building a pointer to pointer to function with 1549 // exception specification. 1550 if (CheckDistantExceptionSpec(T)) { 1551 Diag(Loc, diag::err_distant_exception_spec); 1552 1553 // FIXME: If we're doing this as part of template instantiation, 1554 // we should return immediately. 1555 1556 // Build the type anyway, but use the canonical type so that the 1557 // exception specifiers are stripped off. 1558 T = Context.getCanonicalType(T); 1559 } 1560 1561 // C++ 8.3.3p3: A pointer to member shall not point to ... a member 1562 // with reference type, or "cv void." 1563 if (T->isReferenceType()) { 1564 Diag(Loc, diag::err_illegal_decl_mempointer_to_reference) 1565 << (Entity? Entity.getAsString() : "type name") << T; 1566 return QualType(); 1567 } 1568 1569 if (T->isVoidType()) { 1570 Diag(Loc, diag::err_illegal_decl_mempointer_to_void) 1571 << (Entity? Entity.getAsString() : "type name"); 1572 return QualType(); 1573 } 1574 1575 if (!Class->isDependentType() && !Class->isRecordType()) { 1576 Diag(Loc, diag::err_mempointer_in_nonclass_type) << Class; 1577 return QualType(); 1578 } 1579 1580 // In the Microsoft ABI, the class is allowed to be an incomplete 1581 // type. In such cases, the compiler makes a worst-case assumption. 1582 // We make no such assumption right now, so emit an error if the 1583 // class isn't a complete type. 1584 if (Context.getTargetInfo().getCXXABI() == CXXABI_Microsoft && 1585 RequireCompleteType(Loc, Class, diag::err_incomplete_type)) 1586 return QualType(); 1587 1588 return Context.getMemberPointerType(T, Class.getTypePtr()); 1589} 1590 1591/// \brief Build a block pointer type. 1592/// 1593/// \param T The type to which we'll be building a block pointer. 1594/// 1595/// \param CVR The cvr-qualifiers to be applied to the block pointer type. 1596/// 1597/// \param Loc The location of the entity whose type involves this 1598/// block pointer type or, if there is no such entity, the location of the 1599/// type that will have block pointer type. 1600/// 1601/// \param Entity The name of the entity that involves the block pointer 1602/// type, if known. 1603/// 1604/// \returns A suitable block pointer type, if there are no 1605/// errors. Otherwise, returns a NULL type. 1606QualType Sema::BuildBlockPointerType(QualType T, 1607 SourceLocation Loc, 1608 DeclarationName Entity) { 1609 if (!T->isFunctionType()) { 1610 Diag(Loc, diag::err_nonfunction_block_type); 1611 return QualType(); 1612 } 1613 1614 return Context.getBlockPointerType(T); 1615} 1616 1617QualType Sema::GetTypeFromParser(ParsedType Ty, TypeSourceInfo **TInfo) { 1618 QualType QT = Ty.get(); 1619 if (QT.isNull()) { 1620 if (TInfo) *TInfo = 0; 1621 return QualType(); 1622 } 1623 1624 TypeSourceInfo *DI = 0; 1625 if (const LocInfoType *LIT = dyn_cast<LocInfoType>(QT)) { 1626 QT = LIT->getType(); 1627 DI = LIT->getTypeSourceInfo(); 1628 } 1629 1630 if (TInfo) *TInfo = DI; 1631 return QT; 1632} 1633 1634static void transferARCOwnershipToDeclaratorChunk(TypeProcessingState &state, 1635 Qualifiers::ObjCLifetime ownership, 1636 unsigned chunkIndex); 1637 1638/// Given that this is the declaration of a parameter under ARC, 1639/// attempt to infer attributes and such for pointer-to-whatever 1640/// types. 1641static void inferARCWriteback(TypeProcessingState &state, 1642 QualType &declSpecType) { 1643 Sema &S = state.getSema(); 1644 Declarator &declarator = state.getDeclarator(); 1645 1646 // TODO: should we care about decl qualifiers? 1647 1648 // Check whether the declarator has the expected form. We walk 1649 // from the inside out in order to make the block logic work. 1650 unsigned outermostPointerIndex = 0; 1651 bool isBlockPointer = false; 1652 unsigned numPointers = 0; 1653 for (unsigned i = 0, e = declarator.getNumTypeObjects(); i != e; ++i) { 1654 unsigned chunkIndex = i; 1655 DeclaratorChunk &chunk = declarator.getTypeObject(chunkIndex); 1656 switch (chunk.Kind) { 1657 case DeclaratorChunk::Paren: 1658 // Ignore parens. 1659 break; 1660 1661 case DeclaratorChunk::Reference: 1662 case DeclaratorChunk::Pointer: 1663 // Count the number of pointers. Treat references 1664 // interchangeably as pointers; if they're mis-ordered, normal 1665 // type building will discover that. 1666 outermostPointerIndex = chunkIndex; 1667 numPointers++; 1668 break; 1669 1670 case DeclaratorChunk::BlockPointer: 1671 // If we have a pointer to block pointer, that's an acceptable 1672 // indirect reference; anything else is not an application of 1673 // the rules. 1674 if (numPointers != 1) return; 1675 numPointers++; 1676 outermostPointerIndex = chunkIndex; 1677 isBlockPointer = true; 1678 1679 // We don't care about pointer structure in return values here. 1680 goto done; 1681 1682 case DeclaratorChunk::Array: // suppress if written (id[])? 1683 case DeclaratorChunk::Function: 1684 case DeclaratorChunk::MemberPointer: 1685 return; 1686 } 1687 } 1688 done: 1689 1690 // If we have *one* pointer, then we want to throw the qualifier on 1691 // the declaration-specifiers, which means that it needs to be a 1692 // retainable object type. 1693 if (numPointers == 1) { 1694 // If it's not a retainable object type, the rule doesn't apply. 1695 if (!declSpecType->isObjCRetainableType()) return; 1696 1697 // If it already has lifetime, don't do anything. 1698 if (declSpecType.getObjCLifetime()) return; 1699 1700 // Otherwise, modify the type in-place. 1701 Qualifiers qs; 1702 1703 if (declSpecType->isObjCARCImplicitlyUnretainedType()) 1704 qs.addObjCLifetime(Qualifiers::OCL_ExplicitNone); 1705 else 1706 qs.addObjCLifetime(Qualifiers::OCL_Autoreleasing); 1707 declSpecType = S.Context.getQualifiedType(declSpecType, qs); 1708 1709 // If we have *two* pointers, then we want to throw the qualifier on 1710 // the outermost pointer. 1711 } else if (numPointers == 2) { 1712 // If we don't have a block pointer, we need to check whether the 1713 // declaration-specifiers gave us something that will turn into a 1714 // retainable object pointer after we slap the first pointer on it. 1715 if (!isBlockPointer && !declSpecType->isObjCObjectType()) 1716 return; 1717 1718 // Look for an explicit lifetime attribute there. 1719 DeclaratorChunk &chunk = declarator.getTypeObject(outermostPointerIndex); 1720 if (chunk.Kind != DeclaratorChunk::Pointer && 1721 chunk.Kind != DeclaratorChunk::BlockPointer) 1722 return; 1723 for (const AttributeList *attr = chunk.getAttrs(); attr; 1724 attr = attr->getNext()) 1725 if (attr->getKind() == AttributeList::AT_objc_ownership) 1726 return; 1727 1728 transferARCOwnershipToDeclaratorChunk(state, Qualifiers::OCL_Autoreleasing, 1729 outermostPointerIndex); 1730 1731 // Any other number of pointers/references does not trigger the rule. 1732 } else return; 1733 1734 // TODO: mark whether we did this inference? 1735} 1736 1737static void DiagnoseIgnoredQualifiers(unsigned Quals, 1738 SourceLocation ConstQualLoc, 1739 SourceLocation VolatileQualLoc, 1740 SourceLocation RestrictQualLoc, 1741 Sema& S) { 1742 std::string QualStr; 1743 unsigned NumQuals = 0; 1744 SourceLocation Loc; 1745 1746 FixItHint ConstFixIt; 1747 FixItHint VolatileFixIt; 1748 FixItHint RestrictFixIt; 1749 1750 const SourceManager &SM = S.getSourceManager(); 1751 1752 // FIXME: The locations here are set kind of arbitrarily. It'd be nicer to 1753 // find a range and grow it to encompass all the qualifiers, regardless of 1754 // the order in which they textually appear. 1755 if (Quals & Qualifiers::Const) { 1756 ConstFixIt = FixItHint::CreateRemoval(ConstQualLoc); 1757 QualStr = "const"; 1758 ++NumQuals; 1759 if (!Loc.isValid() || SM.isBeforeInTranslationUnit(ConstQualLoc, Loc)) 1760 Loc = ConstQualLoc; 1761 } 1762 if (Quals & Qualifiers::Volatile) { 1763 VolatileFixIt = FixItHint::CreateRemoval(VolatileQualLoc); 1764 QualStr += (NumQuals == 0 ? "volatile" : " volatile"); 1765 ++NumQuals; 1766 if (!Loc.isValid() || SM.isBeforeInTranslationUnit(VolatileQualLoc, Loc)) 1767 Loc = VolatileQualLoc; 1768 } 1769 if (Quals & Qualifiers::Restrict) { 1770 RestrictFixIt = FixItHint::CreateRemoval(RestrictQualLoc); 1771 QualStr += (NumQuals == 0 ? "restrict" : " restrict"); 1772 ++NumQuals; 1773 if (!Loc.isValid() || SM.isBeforeInTranslationUnit(RestrictQualLoc, Loc)) 1774 Loc = RestrictQualLoc; 1775 } 1776 1777 assert(NumQuals > 0 && "No known qualifiers?"); 1778 1779 S.Diag(Loc, diag::warn_qual_return_type) 1780 << QualStr << NumQuals << ConstFixIt << VolatileFixIt << RestrictFixIt; 1781} 1782 1783static QualType GetDeclSpecTypeForDeclarator(TypeProcessingState &state, 1784 TypeSourceInfo *&ReturnTypeInfo) { 1785 Sema &SemaRef = state.getSema(); 1786 Declarator &D = state.getDeclarator(); 1787 QualType T; 1788 ReturnTypeInfo = 0; 1789 1790 // The TagDecl owned by the DeclSpec. 1791 TagDecl *OwnedTagDecl = 0; 1792 1793 switch (D.getName().getKind()) { 1794 case UnqualifiedId::IK_ImplicitSelfParam: 1795 case UnqualifiedId::IK_OperatorFunctionId: 1796 case UnqualifiedId::IK_Identifier: 1797 case UnqualifiedId::IK_LiteralOperatorId: 1798 case UnqualifiedId::IK_TemplateId: 1799 T = ConvertDeclSpecToType(state); 1800 1801 if (!D.isInvalidType() && D.getDeclSpec().isTypeSpecOwned()) { 1802 OwnedTagDecl = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 1803 // Owned declaration is embedded in declarator. 1804 OwnedTagDecl->setEmbeddedInDeclarator(true); 1805 } 1806 break; 1807 1808 case UnqualifiedId::IK_ConstructorName: 1809 case UnqualifiedId::IK_ConstructorTemplateId: 1810 case UnqualifiedId::IK_DestructorName: 1811 // Constructors and destructors don't have return types. Use 1812 // "void" instead. 1813 T = SemaRef.Context.VoidTy; 1814 break; 1815 1816 case UnqualifiedId::IK_ConversionFunctionId: 1817 // The result type of a conversion function is the type that it 1818 // converts to. 1819 T = SemaRef.GetTypeFromParser(D.getName().ConversionFunctionId, 1820 &ReturnTypeInfo); 1821 break; 1822 } 1823 1824 if (D.getAttributes()) 1825 distributeTypeAttrsFromDeclarator(state, T); 1826 1827 // C++11 [dcl.spec.auto]p5: reject 'auto' if it is not in an allowed context. 1828 // In C++11, a function declarator using 'auto' must have a trailing return 1829 // type (this is checked later) and we can skip this. In other languages 1830 // using auto, we need to check regardless. 1831 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto && 1832 (!SemaRef.getLangOpts().CPlusPlus0x || !D.isFunctionDeclarator())) { 1833 int Error = -1; 1834 1835 switch (D.getContext()) { 1836 case Declarator::KNRTypeListContext: 1837 llvm_unreachable("K&R type lists aren't allowed in C++"); 1838 case Declarator::LambdaExprContext: 1839 llvm_unreachable("Can't specify a type specifier in lambda grammar"); 1840 case Declarator::ObjCParameterContext: 1841 case Declarator::ObjCResultContext: 1842 case Declarator::PrototypeContext: 1843 Error = 0; // Function prototype 1844 break; 1845 case Declarator::MemberContext: 1846 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_static) 1847 break; 1848 switch (cast<TagDecl>(SemaRef.CurContext)->getTagKind()) { 1849 case TTK_Enum: llvm_unreachable("unhandled tag kind"); 1850 case TTK_Struct: Error = 1; /* Struct member */ break; 1851 case TTK_Union: Error = 2; /* Union member */ break; 1852 case TTK_Class: Error = 3; /* Class member */ break; 1853 } 1854 break; 1855 case Declarator::CXXCatchContext: 1856 case Declarator::ObjCCatchContext: 1857 Error = 4; // Exception declaration 1858 break; 1859 case Declarator::TemplateParamContext: 1860 Error = 5; // Template parameter 1861 break; 1862 case Declarator::BlockLiteralContext: 1863 Error = 6; // Block literal 1864 break; 1865 case Declarator::TemplateTypeArgContext: 1866 Error = 7; // Template type argument 1867 break; 1868 case Declarator::AliasDeclContext: 1869 case Declarator::AliasTemplateContext: 1870 Error = 9; // Type alias 1871 break; 1872 case Declarator::TrailingReturnContext: 1873 Error = 10; // Function return type 1874 break; 1875 case Declarator::TypeNameContext: 1876 Error = 11; // Generic 1877 break; 1878 case Declarator::FileContext: 1879 case Declarator::BlockContext: 1880 case Declarator::ForContext: 1881 case Declarator::ConditionContext: 1882 case Declarator::CXXNewContext: 1883 break; 1884 } 1885 1886 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 1887 Error = 8; 1888 1889 // In Objective-C it is an error to use 'auto' on a function declarator. 1890 if (D.isFunctionDeclarator()) 1891 Error = 10; 1892 1893 // C++11 [dcl.spec.auto]p2: 'auto' is always fine if the declarator 1894 // contains a trailing return type. That is only legal at the outermost 1895 // level. Check all declarator chunks (outermost first) anyway, to give 1896 // better diagnostics. 1897 if (SemaRef.getLangOpts().CPlusPlus0x && Error != -1) { 1898 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 1899 unsigned chunkIndex = e - i - 1; 1900 state.setCurrentChunkIndex(chunkIndex); 1901 DeclaratorChunk &DeclType = D.getTypeObject(chunkIndex); 1902 if (DeclType.Kind == DeclaratorChunk::Function) { 1903 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun; 1904 if (FTI.TrailingReturnType) { 1905 Error = -1; 1906 break; 1907 } 1908 } 1909 } 1910 } 1911 1912 if (Error != -1) { 1913 SemaRef.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 1914 diag::err_auto_not_allowed) 1915 << Error; 1916 T = SemaRef.Context.IntTy; 1917 D.setInvalidType(true); 1918 } else 1919 SemaRef.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 1920 diag::warn_cxx98_compat_auto_type_specifier); 1921 } 1922 1923 if (SemaRef.getLangOpts().CPlusPlus && 1924 OwnedTagDecl && OwnedTagDecl->isCompleteDefinition()) { 1925 // Check the contexts where C++ forbids the declaration of a new class 1926 // or enumeration in a type-specifier-seq. 1927 switch (D.getContext()) { 1928 case Declarator::TrailingReturnContext: 1929 // Class and enumeration definitions are syntactically not allowed in 1930 // trailing return types. 1931 llvm_unreachable("parser should not have allowed this"); 1932 break; 1933 case Declarator::FileContext: 1934 case Declarator::MemberContext: 1935 case Declarator::BlockContext: 1936 case Declarator::ForContext: 1937 case Declarator::BlockLiteralContext: 1938 case Declarator::LambdaExprContext: 1939 // C++11 [dcl.type]p3: 1940 // A type-specifier-seq shall not define a class or enumeration unless 1941 // it appears in the type-id of an alias-declaration (7.1.3) that is not 1942 // the declaration of a template-declaration. 1943 case Declarator::AliasDeclContext: 1944 break; 1945 case Declarator::AliasTemplateContext: 1946 SemaRef.Diag(OwnedTagDecl->getLocation(), 1947 diag::err_type_defined_in_alias_template) 1948 << SemaRef.Context.getTypeDeclType(OwnedTagDecl); 1949 break; 1950 case Declarator::TypeNameContext: 1951 case Declarator::TemplateParamContext: 1952 case Declarator::CXXNewContext: 1953 case Declarator::CXXCatchContext: 1954 case Declarator::ObjCCatchContext: 1955 case Declarator::TemplateTypeArgContext: 1956 SemaRef.Diag(OwnedTagDecl->getLocation(), 1957 diag::err_type_defined_in_type_specifier) 1958 << SemaRef.Context.getTypeDeclType(OwnedTagDecl); 1959 break; 1960 case Declarator::PrototypeContext: 1961 case Declarator::ObjCParameterContext: 1962 case Declarator::ObjCResultContext: 1963 case Declarator::KNRTypeListContext: 1964 // C++ [dcl.fct]p6: 1965 // Types shall not be defined in return or parameter types. 1966 SemaRef.Diag(OwnedTagDecl->getLocation(), 1967 diag::err_type_defined_in_param_type) 1968 << SemaRef.Context.getTypeDeclType(OwnedTagDecl); 1969 break; 1970 case Declarator::ConditionContext: 1971 // C++ 6.4p2: 1972 // The type-specifier-seq shall not contain typedef and shall not declare 1973 // a new class or enumeration. 1974 SemaRef.Diag(OwnedTagDecl->getLocation(), 1975 diag::err_type_defined_in_condition); 1976 break; 1977 } 1978 } 1979 1980 return T; 1981} 1982 1983static std::string getFunctionQualifiersAsString(const FunctionProtoType *FnTy){ 1984 std::string Quals = 1985 Qualifiers::fromCVRMask(FnTy->getTypeQuals()).getAsString(); 1986 1987 switch (FnTy->getRefQualifier()) { 1988 case RQ_None: 1989 break; 1990 1991 case RQ_LValue: 1992 if (!Quals.empty()) 1993 Quals += ' '; 1994 Quals += '&'; 1995 break; 1996 1997 case RQ_RValue: 1998 if (!Quals.empty()) 1999 Quals += ' '; 2000 Quals += "&&"; 2001 break; 2002 } 2003 2004 return Quals; 2005} 2006 2007/// Check that the function type T, which has a cv-qualifier or a ref-qualifier, 2008/// can be contained within the declarator chunk DeclType, and produce an 2009/// appropriate diagnostic if not. 2010static void checkQualifiedFunction(Sema &S, QualType T, 2011 DeclaratorChunk &DeclType) { 2012 // C++98 [dcl.fct]p4 / C++11 [dcl.fct]p6: a function type with a 2013 // cv-qualifier or a ref-qualifier can only appear at the topmost level 2014 // of a type. 2015 int DiagKind = -1; 2016 switch (DeclType.Kind) { 2017 case DeclaratorChunk::Paren: 2018 case DeclaratorChunk::MemberPointer: 2019 // These cases are permitted. 2020 return; 2021 case DeclaratorChunk::Array: 2022 case DeclaratorChunk::Function: 2023 // These cases don't allow function types at all; no need to diagnose the 2024 // qualifiers separately. 2025 return; 2026 case DeclaratorChunk::BlockPointer: 2027 DiagKind = 0; 2028 break; 2029 case DeclaratorChunk::Pointer: 2030 DiagKind = 1; 2031 break; 2032 case DeclaratorChunk::Reference: 2033 DiagKind = 2; 2034 break; 2035 } 2036 2037 assert(DiagKind != -1); 2038 S.Diag(DeclType.Loc, diag::err_compound_qualified_function_type) 2039 << DiagKind << isa<FunctionType>(T.IgnoreParens()) << T 2040 << getFunctionQualifiersAsString(T->castAs<FunctionProtoType>()); 2041} 2042 2043static TypeSourceInfo *GetFullTypeForDeclarator(TypeProcessingState &state, 2044 QualType declSpecType, 2045 TypeSourceInfo *TInfo) { 2046 2047 QualType T = declSpecType; 2048 Declarator &D = state.getDeclarator(); 2049 Sema &S = state.getSema(); 2050 ASTContext &Context = S.Context; 2051 const LangOptions &LangOpts = S.getLangOpts(); 2052 2053 bool ImplicitlyNoexcept = false; 2054 if (D.getName().getKind() == UnqualifiedId::IK_OperatorFunctionId && 2055 LangOpts.CPlusPlus0x) { 2056 OverloadedOperatorKind OO = D.getName().OperatorFunctionId.Operator; 2057 /// In C++0x, deallocation functions (normal and array operator delete) 2058 /// are implicitly noexcept. 2059 if (OO == OO_Delete || OO == OO_Array_Delete) 2060 ImplicitlyNoexcept = true; 2061 } 2062 2063 // The name we're declaring, if any. 2064 DeclarationName Name; 2065 if (D.getIdentifier()) 2066 Name = D.getIdentifier(); 2067 2068 // Does this declaration declare a typedef-name? 2069 bool IsTypedefName = 2070 D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef || 2071 D.getContext() == Declarator::AliasDeclContext || 2072 D.getContext() == Declarator::AliasTemplateContext; 2073 2074 // Does T refer to a function type with a cv-qualifier or a ref-qualifier? 2075 bool IsQualifiedFunction = T->isFunctionProtoType() && 2076 (T->castAs<FunctionProtoType>()->getTypeQuals() != 0 || 2077 T->castAs<FunctionProtoType>()->getRefQualifier() != RQ_None); 2078 2079 // Walk the DeclTypeInfo, building the recursive type as we go. 2080 // DeclTypeInfos are ordered from the identifier out, which is 2081 // opposite of what we want :). 2082 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 2083 unsigned chunkIndex = e - i - 1; 2084 state.setCurrentChunkIndex(chunkIndex); 2085 DeclaratorChunk &DeclType = D.getTypeObject(chunkIndex); 2086 if (IsQualifiedFunction) { 2087 checkQualifiedFunction(S, T, DeclType); 2088 IsQualifiedFunction = DeclType.Kind == DeclaratorChunk::Paren; 2089 } 2090 switch (DeclType.Kind) { 2091 case DeclaratorChunk::Paren: 2092 T = S.BuildParenType(T); 2093 break; 2094 case DeclaratorChunk::BlockPointer: 2095 // If blocks are disabled, emit an error. 2096 if (!LangOpts.Blocks) 2097 S.Diag(DeclType.Loc, diag::err_blocks_disable); 2098 2099 T = S.BuildBlockPointerType(T, D.getIdentifierLoc(), Name); 2100 if (DeclType.Cls.TypeQuals) 2101 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Cls.TypeQuals); 2102 break; 2103 case DeclaratorChunk::Pointer: 2104 // Verify that we're not building a pointer to pointer to function with 2105 // exception specification. 2106 if (LangOpts.CPlusPlus && S.CheckDistantExceptionSpec(T)) { 2107 S.Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 2108 D.setInvalidType(true); 2109 // Build the type anyway. 2110 } 2111 if (LangOpts.ObjC1 && T->getAs<ObjCObjectType>()) { 2112 T = Context.getObjCObjectPointerType(T); 2113 if (DeclType.Ptr.TypeQuals) 2114 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Ptr.TypeQuals); 2115 break; 2116 } 2117 T = S.BuildPointerType(T, DeclType.Loc, Name); 2118 if (DeclType.Ptr.TypeQuals) 2119 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Ptr.TypeQuals); 2120 2121 break; 2122 case DeclaratorChunk::Reference: { 2123 // Verify that we're not building a reference to pointer to function with 2124 // exception specification. 2125 if (LangOpts.CPlusPlus && S.CheckDistantExceptionSpec(T)) { 2126 S.Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 2127 D.setInvalidType(true); 2128 // Build the type anyway. 2129 } 2130 T = S.BuildReferenceType(T, DeclType.Ref.LValueRef, DeclType.Loc, Name); 2131 2132 Qualifiers Quals; 2133 if (DeclType.Ref.HasRestrict) 2134 T = S.BuildQualifiedType(T, DeclType.Loc, Qualifiers::Restrict); 2135 break; 2136 } 2137 case DeclaratorChunk::Array: { 2138 // Verify that we're not building an array of pointers to function with 2139 // exception specification. 2140 if (LangOpts.CPlusPlus && S.CheckDistantExceptionSpec(T)) { 2141 S.Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 2142 D.setInvalidType(true); 2143 // Build the type anyway. 2144 } 2145 DeclaratorChunk::ArrayTypeInfo &ATI = DeclType.Arr; 2146 Expr *ArraySize = static_cast<Expr*>(ATI.NumElts); 2147 ArrayType::ArraySizeModifier ASM; 2148 if (ATI.isStar) 2149 ASM = ArrayType::Star; 2150 else if (ATI.hasStatic) 2151 ASM = ArrayType::Static; 2152 else 2153 ASM = ArrayType::Normal; 2154 if (ASM == ArrayType::Star && !D.isPrototypeContext()) { 2155 // FIXME: This check isn't quite right: it allows star in prototypes 2156 // for function definitions, and disallows some edge cases detailed 2157 // in http://gcc.gnu.org/ml/gcc-patches/2009-02/msg00133.html 2158 S.Diag(DeclType.Loc, diag::err_array_star_outside_prototype); 2159 ASM = ArrayType::Normal; 2160 D.setInvalidType(true); 2161 } 2162 T = S.BuildArrayType(T, ASM, ArraySize, ATI.TypeQuals, 2163 SourceRange(DeclType.Loc, DeclType.EndLoc), Name); 2164 break; 2165 } 2166 case DeclaratorChunk::Function: { 2167 // If the function declarator has a prototype (i.e. it is not () and 2168 // does not have a K&R-style identifier list), then the arguments are part 2169 // of the type, otherwise the argument list is (). 2170 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun; 2171 IsQualifiedFunction = FTI.TypeQuals || FTI.hasRefQualifier(); 2172 2173 // Check for auto functions and trailing return type and adjust the 2174 // return type accordingly. 2175 if (!D.isInvalidType()) { 2176 // trailing-return-type is only required if we're declaring a function, 2177 // and not, for instance, a pointer to a function. 2178 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto && 2179 !FTI.TrailingReturnType && chunkIndex == 0) { 2180 S.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 2181 diag::err_auto_missing_trailing_return); 2182 T = Context.IntTy; 2183 D.setInvalidType(true); 2184 } else if (FTI.TrailingReturnType) { 2185 // T must be exactly 'auto' at this point. See CWG issue 681. 2186 if (isa<ParenType>(T)) { 2187 S.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 2188 diag::err_trailing_return_in_parens) 2189 << T << D.getDeclSpec().getSourceRange(); 2190 D.setInvalidType(true); 2191 } else if (D.getContext() != Declarator::LambdaExprContext && 2192 (T.hasQualifiers() || !isa<AutoType>(T))) { 2193 S.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 2194 diag::err_trailing_return_without_auto) 2195 << T << D.getDeclSpec().getSourceRange(); 2196 D.setInvalidType(true); 2197 } 2198 2199 T = S.GetTypeFromParser( 2200 ParsedType::getFromOpaquePtr(FTI.TrailingReturnType), 2201 &TInfo); 2202 } 2203 } 2204 2205 // C99 6.7.5.3p1: The return type may not be a function or array type. 2206 // For conversion functions, we'll diagnose this particular error later. 2207 if ((T->isArrayType() || T->isFunctionType()) && 2208 (D.getName().getKind() != UnqualifiedId::IK_ConversionFunctionId)) { 2209 unsigned diagID = diag::err_func_returning_array_function; 2210 // Last processing chunk in block context means this function chunk 2211 // represents the block. 2212 if (chunkIndex == 0 && 2213 D.getContext() == Declarator::BlockLiteralContext) 2214 diagID = diag::err_block_returning_array_function; 2215 S.Diag(DeclType.Loc, diagID) << T->isFunctionType() << T; 2216 T = Context.IntTy; 2217 D.setInvalidType(true); 2218 } 2219 2220 // Do not allow returning half FP value. 2221 // FIXME: This really should be in BuildFunctionType. 2222 if (T->isHalfType()) { 2223 S.Diag(D.getIdentifierLoc(), 2224 diag::err_parameters_retval_cannot_have_fp16_type) << 1 2225 << FixItHint::CreateInsertion(D.getIdentifierLoc(), "*"); 2226 D.setInvalidType(true); 2227 } 2228 2229 // cv-qualifiers on return types are pointless except when the type is a 2230 // class type in C++. 2231 if (isa<PointerType>(T) && T.getLocalCVRQualifiers() && 2232 (D.getName().getKind() != UnqualifiedId::IK_ConversionFunctionId) && 2233 (!LangOpts.CPlusPlus || !T->isDependentType())) { 2234 assert(chunkIndex + 1 < e && "No DeclaratorChunk for the return type?"); 2235 DeclaratorChunk ReturnTypeChunk = D.getTypeObject(chunkIndex + 1); 2236 assert(ReturnTypeChunk.Kind == DeclaratorChunk::Pointer); 2237 2238 DeclaratorChunk::PointerTypeInfo &PTI = ReturnTypeChunk.Ptr; 2239 2240 DiagnoseIgnoredQualifiers(PTI.TypeQuals, 2241 SourceLocation::getFromRawEncoding(PTI.ConstQualLoc), 2242 SourceLocation::getFromRawEncoding(PTI.VolatileQualLoc), 2243 SourceLocation::getFromRawEncoding(PTI.RestrictQualLoc), 2244 S); 2245 2246 } else if (T.getCVRQualifiers() && D.getDeclSpec().getTypeQualifiers() && 2247 (!LangOpts.CPlusPlus || 2248 (!T->isDependentType() && !T->isRecordType()))) { 2249 2250 DiagnoseIgnoredQualifiers(D.getDeclSpec().getTypeQualifiers(), 2251 D.getDeclSpec().getConstSpecLoc(), 2252 D.getDeclSpec().getVolatileSpecLoc(), 2253 D.getDeclSpec().getRestrictSpecLoc(), 2254 S); 2255 } 2256 2257 if (LangOpts.CPlusPlus && D.getDeclSpec().isTypeSpecOwned()) { 2258 // C++ [dcl.fct]p6: 2259 // Types shall not be defined in return or parameter types. 2260 TagDecl *Tag = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 2261 if (Tag->isCompleteDefinition()) 2262 S.Diag(Tag->getLocation(), diag::err_type_defined_in_result_type) 2263 << Context.getTypeDeclType(Tag); 2264 } 2265 2266 // Exception specs are not allowed in typedefs. Complain, but add it 2267 // anyway. 2268 if (IsTypedefName && FTI.getExceptionSpecType()) 2269 S.Diag(FTI.getExceptionSpecLoc(), diag::err_exception_spec_in_typedef) 2270 << (D.getContext() == Declarator::AliasDeclContext || 2271 D.getContext() == Declarator::AliasTemplateContext); 2272 2273 if (!FTI.NumArgs && !FTI.isVariadic && !LangOpts.CPlusPlus) { 2274 // Simple void foo(), where the incoming T is the result type. 2275 T = Context.getFunctionNoProtoType(T); 2276 } else { 2277 // We allow a zero-parameter variadic function in C if the 2278 // function is marked with the "overloadable" attribute. Scan 2279 // for this attribute now. 2280 if (!FTI.NumArgs && FTI.isVariadic && !LangOpts.CPlusPlus) { 2281 bool Overloadable = false; 2282 for (const AttributeList *Attrs = D.getAttributes(); 2283 Attrs; Attrs = Attrs->getNext()) { 2284 if (Attrs->getKind() == AttributeList::AT_overloadable) { 2285 Overloadable = true; 2286 break; 2287 } 2288 } 2289 2290 if (!Overloadable) 2291 S.Diag(FTI.getEllipsisLoc(), diag::err_ellipsis_first_arg); 2292 } 2293 2294 if (FTI.NumArgs && FTI.ArgInfo[0].Param == 0) { 2295 // C99 6.7.5.3p3: Reject int(x,y,z) when it's not a function 2296 // definition. 2297 S.Diag(FTI.ArgInfo[0].IdentLoc, diag::err_ident_list_in_fn_declaration); 2298 D.setInvalidType(true); 2299 break; 2300 } 2301 2302 FunctionProtoType::ExtProtoInfo EPI; 2303 EPI.Variadic = FTI.isVariadic; 2304 EPI.HasTrailingReturn = FTI.TrailingReturnType; 2305 EPI.TypeQuals = FTI.TypeQuals; 2306 EPI.RefQualifier = !FTI.hasRefQualifier()? RQ_None 2307 : FTI.RefQualifierIsLValueRef? RQ_LValue 2308 : RQ_RValue; 2309 2310 // Otherwise, we have a function with an argument list that is 2311 // potentially variadic. 2312 SmallVector<QualType, 16> ArgTys; 2313 ArgTys.reserve(FTI.NumArgs); 2314 2315 SmallVector<bool, 16> ConsumedArguments; 2316 ConsumedArguments.reserve(FTI.NumArgs); 2317 bool HasAnyConsumedArguments = false; 2318 2319 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 2320 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 2321 QualType ArgTy = Param->getType(); 2322 assert(!ArgTy.isNull() && "Couldn't parse type?"); 2323 2324 // Adjust the parameter type. 2325 assert((ArgTy == Context.getAdjustedParameterType(ArgTy)) && 2326 "Unadjusted type?"); 2327 2328 // Look for 'void'. void is allowed only as a single argument to a 2329 // function with no other parameters (C99 6.7.5.3p10). We record 2330 // int(void) as a FunctionProtoType with an empty argument list. 2331 if (ArgTy->isVoidType()) { 2332 // If this is something like 'float(int, void)', reject it. 'void' 2333 // is an incomplete type (C99 6.2.5p19) and function decls cannot 2334 // have arguments of incomplete type. 2335 if (FTI.NumArgs != 1 || FTI.isVariadic) { 2336 S.Diag(DeclType.Loc, diag::err_void_only_param); 2337 ArgTy = Context.IntTy; 2338 Param->setType(ArgTy); 2339 } else if (FTI.ArgInfo[i].Ident) { 2340 // Reject, but continue to parse 'int(void abc)'. 2341 S.Diag(FTI.ArgInfo[i].IdentLoc, 2342 diag::err_param_with_void_type); 2343 ArgTy = Context.IntTy; 2344 Param->setType(ArgTy); 2345 } else { 2346 // Reject, but continue to parse 'float(const void)'. 2347 if (ArgTy.hasQualifiers()) 2348 S.Diag(DeclType.Loc, diag::err_void_param_qualified); 2349 2350 // Do not add 'void' to the ArgTys list. 2351 break; 2352 } 2353 } else if (ArgTy->isHalfType()) { 2354 // Disallow half FP arguments. 2355 // FIXME: This really should be in BuildFunctionType. 2356 S.Diag(Param->getLocation(), 2357 diag::err_parameters_retval_cannot_have_fp16_type) << 0 2358 << FixItHint::CreateInsertion(Param->getLocation(), "*"); 2359 D.setInvalidType(); 2360 } else if (!FTI.hasPrototype) { 2361 if (ArgTy->isPromotableIntegerType()) { 2362 ArgTy = Context.getPromotedIntegerType(ArgTy); 2363 Param->setKNRPromoted(true); 2364 } else if (const BuiltinType* BTy = ArgTy->getAs<BuiltinType>()) { 2365 if (BTy->getKind() == BuiltinType::Float) { 2366 ArgTy = Context.DoubleTy; 2367 Param->setKNRPromoted(true); 2368 } 2369 } 2370 } 2371 2372 if (LangOpts.ObjCAutoRefCount) { 2373 bool Consumed = Param->hasAttr<NSConsumedAttr>(); 2374 ConsumedArguments.push_back(Consumed); 2375 HasAnyConsumedArguments |= Consumed; 2376 } 2377 2378 ArgTys.push_back(ArgTy); 2379 } 2380 2381 if (HasAnyConsumedArguments) 2382 EPI.ConsumedArguments = ConsumedArguments.data(); 2383 2384 SmallVector<QualType, 4> Exceptions; 2385 SmallVector<ParsedType, 2> DynamicExceptions; 2386 SmallVector<SourceRange, 2> DynamicExceptionRanges; 2387 Expr *NoexceptExpr = 0; 2388 2389 if (FTI.getExceptionSpecType() == EST_Dynamic) { 2390 // FIXME: It's rather inefficient to have to split into two vectors 2391 // here. 2392 unsigned N = FTI.NumExceptions; 2393 DynamicExceptions.reserve(N); 2394 DynamicExceptionRanges.reserve(N); 2395 for (unsigned I = 0; I != N; ++I) { 2396 DynamicExceptions.push_back(FTI.Exceptions[I].Ty); 2397 DynamicExceptionRanges.push_back(FTI.Exceptions[I].Range); 2398 } 2399 } else if (FTI.getExceptionSpecType() == EST_ComputedNoexcept) { 2400 NoexceptExpr = FTI.NoexceptExpr; 2401 } 2402 2403 S.checkExceptionSpecification(FTI.getExceptionSpecType(), 2404 DynamicExceptions, 2405 DynamicExceptionRanges, 2406 NoexceptExpr, 2407 Exceptions, 2408 EPI); 2409 2410 if (FTI.getExceptionSpecType() == EST_None && 2411 ImplicitlyNoexcept && chunkIndex == 0) { 2412 // Only the outermost chunk is marked noexcept, of course. 2413 EPI.ExceptionSpecType = EST_BasicNoexcept; 2414 } 2415 2416 T = Context.getFunctionType(T, ArgTys.data(), ArgTys.size(), EPI); 2417 } 2418 2419 break; 2420 } 2421 case DeclaratorChunk::MemberPointer: 2422 // The scope spec must refer to a class, or be dependent. 2423 CXXScopeSpec &SS = DeclType.Mem.Scope(); 2424 QualType ClsType; 2425 if (SS.isInvalid()) { 2426 // Avoid emitting extra errors if we already errored on the scope. 2427 D.setInvalidType(true); 2428 } else if (S.isDependentScopeSpecifier(SS) || 2429 dyn_cast_or_null<CXXRecordDecl>(S.computeDeclContext(SS))) { 2430 NestedNameSpecifier *NNS 2431 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 2432 NestedNameSpecifier *NNSPrefix = NNS->getPrefix(); 2433 switch (NNS->getKind()) { 2434 case NestedNameSpecifier::Identifier: 2435 ClsType = Context.getDependentNameType(ETK_None, NNSPrefix, 2436 NNS->getAsIdentifier()); 2437 break; 2438 2439 case NestedNameSpecifier::Namespace: 2440 case NestedNameSpecifier::NamespaceAlias: 2441 case NestedNameSpecifier::Global: 2442 llvm_unreachable("Nested-name-specifier must name a type"); 2443 2444 case NestedNameSpecifier::TypeSpec: 2445 case NestedNameSpecifier::TypeSpecWithTemplate: 2446 ClsType = QualType(NNS->getAsType(), 0); 2447 // Note: if the NNS has a prefix and ClsType is a nondependent 2448 // TemplateSpecializationType, then the NNS prefix is NOT included 2449 // in ClsType; hence we wrap ClsType into an ElaboratedType. 2450 // NOTE: in particular, no wrap occurs if ClsType already is an 2451 // Elaborated, DependentName, or DependentTemplateSpecialization. 2452 if (NNSPrefix && isa<TemplateSpecializationType>(NNS->getAsType())) 2453 ClsType = Context.getElaboratedType(ETK_None, NNSPrefix, ClsType); 2454 break; 2455 } 2456 } else { 2457 S.Diag(DeclType.Mem.Scope().getBeginLoc(), 2458 diag::err_illegal_decl_mempointer_in_nonclass) 2459 << (D.getIdentifier() ? D.getIdentifier()->getName() : "type name") 2460 << DeclType.Mem.Scope().getRange(); 2461 D.setInvalidType(true); 2462 } 2463 2464 if (!ClsType.isNull()) 2465 T = S.BuildMemberPointerType(T, ClsType, DeclType.Loc, D.getIdentifier()); 2466 if (T.isNull()) { 2467 T = Context.IntTy; 2468 D.setInvalidType(true); 2469 } else if (DeclType.Mem.TypeQuals) { 2470 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Mem.TypeQuals); 2471 } 2472 break; 2473 } 2474 2475 if (T.isNull()) { 2476 D.setInvalidType(true); 2477 T = Context.IntTy; 2478 } 2479 2480 // See if there are any attributes on this declarator chunk. 2481 if (AttributeList *attrs = const_cast<AttributeList*>(DeclType.getAttrs())) 2482 processTypeAttrs(state, T, false, attrs); 2483 } 2484 2485 if (LangOpts.CPlusPlus && T->isFunctionType()) { 2486 const FunctionProtoType *FnTy = T->getAs<FunctionProtoType>(); 2487 assert(FnTy && "Why oh why is there not a FunctionProtoType here?"); 2488 2489 // C++ 8.3.5p4: 2490 // A cv-qualifier-seq shall only be part of the function type 2491 // for a nonstatic member function, the function type to which a pointer 2492 // to member refers, or the top-level function type of a function typedef 2493 // declaration. 2494 // 2495 // Core issue 547 also allows cv-qualifiers on function types that are 2496 // top-level template type arguments. 2497 bool FreeFunction; 2498 if (!D.getCXXScopeSpec().isSet()) { 2499 FreeFunction = ((D.getContext() != Declarator::MemberContext && 2500 D.getContext() != Declarator::LambdaExprContext) || 2501 D.getDeclSpec().isFriendSpecified()); 2502 } else { 2503 DeclContext *DC = S.computeDeclContext(D.getCXXScopeSpec()); 2504 FreeFunction = (DC && !DC->isRecord()); 2505 } 2506 2507 // C++0x [dcl.constexpr]p8: A constexpr specifier for a non-static member 2508 // function that is not a constructor declares that function to be const. 2509 if (D.getDeclSpec().isConstexprSpecified() && !FreeFunction && 2510 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static && 2511 D.getName().getKind() != UnqualifiedId::IK_ConstructorName && 2512 D.getName().getKind() != UnqualifiedId::IK_ConstructorTemplateId && 2513 !(FnTy->getTypeQuals() & DeclSpec::TQ_const)) { 2514 // Rebuild function type adding a 'const' qualifier. 2515 FunctionProtoType::ExtProtoInfo EPI = FnTy->getExtProtoInfo(); 2516 EPI.TypeQuals |= DeclSpec::TQ_const; 2517 T = Context.getFunctionType(FnTy->getResultType(), 2518 FnTy->arg_type_begin(), 2519 FnTy->getNumArgs(), EPI); 2520 } 2521 2522 // C++11 [dcl.fct]p6 (w/DR1417): 2523 // An attempt to specify a function type with a cv-qualifier-seq or a 2524 // ref-qualifier (including by typedef-name) is ill-formed unless it is: 2525 // - the function type for a non-static member function, 2526 // - the function type to which a pointer to member refers, 2527 // - the top-level function type of a function typedef declaration or 2528 // alias-declaration, 2529 // - the type-id in the default argument of a type-parameter, or 2530 // - the type-id of a template-argument for a type-parameter 2531 if (IsQualifiedFunction && 2532 !(!FreeFunction && 2533 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) && 2534 !IsTypedefName && 2535 D.getContext() != Declarator::TemplateTypeArgContext) { 2536 SourceLocation Loc = D.getLocStart(); 2537 SourceRange RemovalRange; 2538 unsigned I; 2539 if (D.isFunctionDeclarator(I)) { 2540 SmallVector<SourceLocation, 4> RemovalLocs; 2541 const DeclaratorChunk &Chunk = D.getTypeObject(I); 2542 assert(Chunk.Kind == DeclaratorChunk::Function); 2543 if (Chunk.Fun.hasRefQualifier()) 2544 RemovalLocs.push_back(Chunk.Fun.getRefQualifierLoc()); 2545 if (Chunk.Fun.TypeQuals & Qualifiers::Const) 2546 RemovalLocs.push_back(Chunk.Fun.getConstQualifierLoc()); 2547 if (Chunk.Fun.TypeQuals & Qualifiers::Volatile) 2548 RemovalLocs.push_back(Chunk.Fun.getVolatileQualifierLoc()); 2549 // FIXME: We do not track the location of the __restrict qualifier. 2550 //if (Chunk.Fun.TypeQuals & Qualifiers::Restrict) 2551 // RemovalLocs.push_back(Chunk.Fun.getRestrictQualifierLoc()); 2552 if (!RemovalLocs.empty()) { 2553 std::sort(RemovalLocs.begin(), RemovalLocs.end(), 2554 SourceManager::LocBeforeThanCompare(S.getSourceManager())); 2555 RemovalRange = SourceRange(RemovalLocs.front(), RemovalLocs.back()); 2556 Loc = RemovalLocs.front(); 2557 } 2558 } 2559 2560 S.Diag(Loc, diag::err_invalid_qualified_function_type) 2561 << FreeFunction << D.isFunctionDeclarator() << T 2562 << getFunctionQualifiersAsString(FnTy) 2563 << FixItHint::CreateRemoval(RemovalRange); 2564 2565 // Strip the cv-qualifiers and ref-qualifiers from the type. 2566 FunctionProtoType::ExtProtoInfo EPI = FnTy->getExtProtoInfo(); 2567 EPI.TypeQuals = 0; 2568 EPI.RefQualifier = RQ_None; 2569 2570 T = Context.getFunctionType(FnTy->getResultType(), 2571 FnTy->arg_type_begin(), 2572 FnTy->getNumArgs(), EPI); 2573 } 2574 } 2575 2576 // Apply any undistributed attributes from the declarator. 2577 if (!T.isNull()) 2578 if (AttributeList *attrs = D.getAttributes()) 2579 processTypeAttrs(state, T, false, attrs); 2580 2581 // Diagnose any ignored type attributes. 2582 if (!T.isNull()) state.diagnoseIgnoredTypeAttrs(T); 2583 2584 // C++0x [dcl.constexpr]p9: 2585 // A constexpr specifier used in an object declaration declares the object 2586 // as const. 2587 if (D.getDeclSpec().isConstexprSpecified() && T->isObjectType()) { 2588 T.addConst(); 2589 } 2590 2591 // If there was an ellipsis in the declarator, the declaration declares a 2592 // parameter pack whose type may be a pack expansion type. 2593 if (D.hasEllipsis() && !T.isNull()) { 2594 // C++0x [dcl.fct]p13: 2595 // A declarator-id or abstract-declarator containing an ellipsis shall 2596 // only be used in a parameter-declaration. Such a parameter-declaration 2597 // is a parameter pack (14.5.3). [...] 2598 switch (D.getContext()) { 2599 case Declarator::PrototypeContext: 2600 // C++0x [dcl.fct]p13: 2601 // [...] When it is part of a parameter-declaration-clause, the 2602 // parameter pack is a function parameter pack (14.5.3). The type T 2603 // of the declarator-id of the function parameter pack shall contain 2604 // a template parameter pack; each template parameter pack in T is 2605 // expanded by the function parameter pack. 2606 // 2607 // We represent function parameter packs as function parameters whose 2608 // type is a pack expansion. 2609 if (!T->containsUnexpandedParameterPack()) { 2610 S.Diag(D.getEllipsisLoc(), 2611 diag::err_function_parameter_pack_without_parameter_packs) 2612 << T << D.getSourceRange(); 2613 D.setEllipsisLoc(SourceLocation()); 2614 } else { 2615 T = Context.getPackExpansionType(T, llvm::Optional<unsigned>()); 2616 } 2617 break; 2618 2619 case Declarator::TemplateParamContext: 2620 // C++0x [temp.param]p15: 2621 // If a template-parameter is a [...] is a parameter-declaration that 2622 // declares a parameter pack (8.3.5), then the template-parameter is a 2623 // template parameter pack (14.5.3). 2624 // 2625 // Note: core issue 778 clarifies that, if there are any unexpanded 2626 // parameter packs in the type of the non-type template parameter, then 2627 // it expands those parameter packs. 2628 if (T->containsUnexpandedParameterPack()) 2629 T = Context.getPackExpansionType(T, llvm::Optional<unsigned>()); 2630 else 2631 S.Diag(D.getEllipsisLoc(), 2632 LangOpts.CPlusPlus0x 2633 ? diag::warn_cxx98_compat_variadic_templates 2634 : diag::ext_variadic_templates); 2635 break; 2636 2637 case Declarator::FileContext: 2638 case Declarator::KNRTypeListContext: 2639 case Declarator::ObjCParameterContext: // FIXME: special diagnostic here? 2640 case Declarator::ObjCResultContext: // FIXME: special diagnostic here? 2641 case Declarator::TypeNameContext: 2642 case Declarator::CXXNewContext: 2643 case Declarator::AliasDeclContext: 2644 case Declarator::AliasTemplateContext: 2645 case Declarator::MemberContext: 2646 case Declarator::BlockContext: 2647 case Declarator::ForContext: 2648 case Declarator::ConditionContext: 2649 case Declarator::CXXCatchContext: 2650 case Declarator::ObjCCatchContext: 2651 case Declarator::BlockLiteralContext: 2652 case Declarator::LambdaExprContext: 2653 case Declarator::TrailingReturnContext: 2654 case Declarator::TemplateTypeArgContext: 2655 // FIXME: We may want to allow parameter packs in block-literal contexts 2656 // in the future. 2657 S.Diag(D.getEllipsisLoc(), diag::err_ellipsis_in_declarator_not_parameter); 2658 D.setEllipsisLoc(SourceLocation()); 2659 break; 2660 } 2661 } 2662 2663 if (T.isNull()) 2664 return Context.getNullTypeSourceInfo(); 2665 else if (D.isInvalidType()) 2666 return Context.getTrivialTypeSourceInfo(T); 2667 2668 return S.GetTypeSourceInfoForDeclarator(D, T, TInfo); 2669} 2670 2671/// GetTypeForDeclarator - Convert the type for the specified 2672/// declarator to Type instances. 2673/// 2674/// The result of this call will never be null, but the associated 2675/// type may be a null type if there's an unrecoverable error. 2676TypeSourceInfo *Sema::GetTypeForDeclarator(Declarator &D, Scope *S) { 2677 // Determine the type of the declarator. Not all forms of declarator 2678 // have a type. 2679 2680 TypeProcessingState state(*this, D); 2681 2682 TypeSourceInfo *ReturnTypeInfo = 0; 2683 QualType T = GetDeclSpecTypeForDeclarator(state, ReturnTypeInfo); 2684 if (T.isNull()) 2685 return Context.getNullTypeSourceInfo(); 2686 2687 if (D.isPrototypeContext() && getLangOpts().ObjCAutoRefCount) 2688 inferARCWriteback(state, T); 2689 2690 return GetFullTypeForDeclarator(state, T, ReturnTypeInfo); 2691} 2692 2693static void transferARCOwnershipToDeclSpec(Sema &S, 2694 QualType &declSpecTy, 2695 Qualifiers::ObjCLifetime ownership) { 2696 if (declSpecTy->isObjCRetainableType() && 2697 declSpecTy.getObjCLifetime() == Qualifiers::OCL_None) { 2698 Qualifiers qs; 2699 qs.addObjCLifetime(ownership); 2700 declSpecTy = S.Context.getQualifiedType(declSpecTy, qs); 2701 } 2702} 2703 2704static void transferARCOwnershipToDeclaratorChunk(TypeProcessingState &state, 2705 Qualifiers::ObjCLifetime ownership, 2706 unsigned chunkIndex) { 2707 Sema &S = state.getSema(); 2708 Declarator &D = state.getDeclarator(); 2709 2710 // Look for an explicit lifetime attribute. 2711 DeclaratorChunk &chunk = D.getTypeObject(chunkIndex); 2712 for (const AttributeList *attr = chunk.getAttrs(); attr; 2713 attr = attr->getNext()) 2714 if (attr->getKind() == AttributeList::AT_objc_ownership) 2715 return; 2716 2717 const char *attrStr = 0; 2718 switch (ownership) { 2719 case Qualifiers::OCL_None: llvm_unreachable("no ownership!"); 2720 case Qualifiers::OCL_ExplicitNone: attrStr = "none"; break; 2721 case Qualifiers::OCL_Strong: attrStr = "strong"; break; 2722 case Qualifiers::OCL_Weak: attrStr = "weak"; break; 2723 case Qualifiers::OCL_Autoreleasing: attrStr = "autoreleasing"; break; 2724 } 2725 2726 // If there wasn't one, add one (with an invalid source location 2727 // so that we don't make an AttributedType for it). 2728 AttributeList *attr = D.getAttributePool() 2729 .create(&S.Context.Idents.get("objc_ownership"), SourceLocation(), 2730 /*scope*/ 0, SourceLocation(), 2731 &S.Context.Idents.get(attrStr), SourceLocation(), 2732 /*args*/ 0, 0, 2733 /*declspec*/ false, /*C++0x*/ false); 2734 spliceAttrIntoList(*attr, chunk.getAttrListRef()); 2735 2736 // TODO: mark whether we did this inference? 2737} 2738 2739/// \brief Used for transfering ownership in casts resulting in l-values. 2740static void transferARCOwnership(TypeProcessingState &state, 2741 QualType &declSpecTy, 2742 Qualifiers::ObjCLifetime ownership) { 2743 Sema &S = state.getSema(); 2744 Declarator &D = state.getDeclarator(); 2745 2746 int inner = -1; 2747 bool hasIndirection = false; 2748 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 2749 DeclaratorChunk &chunk = D.getTypeObject(i); 2750 switch (chunk.Kind) { 2751 case DeclaratorChunk::Paren: 2752 // Ignore parens. 2753 break; 2754 2755 case DeclaratorChunk::Array: 2756 case DeclaratorChunk::Reference: 2757 case DeclaratorChunk::Pointer: 2758 if (inner != -1) 2759 hasIndirection = true; 2760 inner = i; 2761 break; 2762 2763 case DeclaratorChunk::BlockPointer: 2764 if (inner != -1) 2765 transferARCOwnershipToDeclaratorChunk(state, ownership, i); 2766 return; 2767 2768 case DeclaratorChunk::Function: 2769 case DeclaratorChunk::MemberPointer: 2770 return; 2771 } 2772 } 2773 2774 if (inner == -1) 2775 return; 2776 2777 DeclaratorChunk &chunk = D.getTypeObject(inner); 2778 if (chunk.Kind == DeclaratorChunk::Pointer) { 2779 if (declSpecTy->isObjCRetainableType()) 2780 return transferARCOwnershipToDeclSpec(S, declSpecTy, ownership); 2781 if (declSpecTy->isObjCObjectType() && hasIndirection) 2782 return transferARCOwnershipToDeclaratorChunk(state, ownership, inner); 2783 } else { 2784 assert(chunk.Kind == DeclaratorChunk::Array || 2785 chunk.Kind == DeclaratorChunk::Reference); 2786 return transferARCOwnershipToDeclSpec(S, declSpecTy, ownership); 2787 } 2788} 2789 2790TypeSourceInfo *Sema::GetTypeForDeclaratorCast(Declarator &D, QualType FromTy) { 2791 TypeProcessingState state(*this, D); 2792 2793 TypeSourceInfo *ReturnTypeInfo = 0; 2794 QualType declSpecTy = GetDeclSpecTypeForDeclarator(state, ReturnTypeInfo); 2795 if (declSpecTy.isNull()) 2796 return Context.getNullTypeSourceInfo(); 2797 2798 if (getLangOpts().ObjCAutoRefCount) { 2799 Qualifiers::ObjCLifetime ownership = Context.getInnerObjCOwnership(FromTy); 2800 if (ownership != Qualifiers::OCL_None) 2801 transferARCOwnership(state, declSpecTy, ownership); 2802 } 2803 2804 return GetFullTypeForDeclarator(state, declSpecTy, ReturnTypeInfo); 2805} 2806 2807/// Map an AttributedType::Kind to an AttributeList::Kind. 2808static AttributeList::Kind getAttrListKind(AttributedType::Kind kind) { 2809 switch (kind) { 2810 case AttributedType::attr_address_space: 2811 return AttributeList::AT_address_space; 2812 case AttributedType::attr_regparm: 2813 return AttributeList::AT_regparm; 2814 case AttributedType::attr_vector_size: 2815 return AttributeList::AT_vector_size; 2816 case AttributedType::attr_neon_vector_type: 2817 return AttributeList::AT_neon_vector_type; 2818 case AttributedType::attr_neon_polyvector_type: 2819 return AttributeList::AT_neon_polyvector_type; 2820 case AttributedType::attr_objc_gc: 2821 return AttributeList::AT_objc_gc; 2822 case AttributedType::attr_objc_ownership: 2823 return AttributeList::AT_objc_ownership; 2824 case AttributedType::attr_noreturn: 2825 return AttributeList::AT_noreturn; 2826 case AttributedType::attr_cdecl: 2827 return AttributeList::AT_cdecl; 2828 case AttributedType::attr_fastcall: 2829 return AttributeList::AT_fastcall; 2830 case AttributedType::attr_stdcall: 2831 return AttributeList::AT_stdcall; 2832 case AttributedType::attr_thiscall: 2833 return AttributeList::AT_thiscall; 2834 case AttributedType::attr_pascal: 2835 return AttributeList::AT_pascal; 2836 case AttributedType::attr_pcs: 2837 return AttributeList::AT_pcs; 2838 } 2839 llvm_unreachable("unexpected attribute kind!"); 2840} 2841 2842static void fillAttributedTypeLoc(AttributedTypeLoc TL, 2843 const AttributeList *attrs) { 2844 AttributedType::Kind kind = TL.getAttrKind(); 2845 2846 assert(attrs && "no type attributes in the expected location!"); 2847 AttributeList::Kind parsedKind = getAttrListKind(kind); 2848 while (attrs->getKind() != parsedKind) { 2849 attrs = attrs->getNext(); 2850 assert(attrs && "no matching attribute in expected location!"); 2851 } 2852 2853 TL.setAttrNameLoc(attrs->getLoc()); 2854 if (TL.hasAttrExprOperand()) 2855 TL.setAttrExprOperand(attrs->getArg(0)); 2856 else if (TL.hasAttrEnumOperand()) 2857 TL.setAttrEnumOperandLoc(attrs->getParameterLoc()); 2858 2859 // FIXME: preserve this information to here. 2860 if (TL.hasAttrOperand()) 2861 TL.setAttrOperandParensRange(SourceRange()); 2862} 2863 2864namespace { 2865 class TypeSpecLocFiller : public TypeLocVisitor<TypeSpecLocFiller> { 2866 ASTContext &Context; 2867 const DeclSpec &DS; 2868 2869 public: 2870 TypeSpecLocFiller(ASTContext &Context, const DeclSpec &DS) 2871 : Context(Context), DS(DS) {} 2872 2873 void VisitAttributedTypeLoc(AttributedTypeLoc TL) { 2874 fillAttributedTypeLoc(TL, DS.getAttributes().getList()); 2875 Visit(TL.getModifiedLoc()); 2876 } 2877 void VisitQualifiedTypeLoc(QualifiedTypeLoc TL) { 2878 Visit(TL.getUnqualifiedLoc()); 2879 } 2880 void VisitTypedefTypeLoc(TypedefTypeLoc TL) { 2881 TL.setNameLoc(DS.getTypeSpecTypeLoc()); 2882 } 2883 void VisitObjCInterfaceTypeLoc(ObjCInterfaceTypeLoc TL) { 2884 TL.setNameLoc(DS.getTypeSpecTypeLoc()); 2885 } 2886 void VisitObjCObjectTypeLoc(ObjCObjectTypeLoc TL) { 2887 // Handle the base type, which might not have been written explicitly. 2888 if (DS.getTypeSpecType() == DeclSpec::TST_unspecified) { 2889 TL.setHasBaseTypeAsWritten(false); 2890 TL.getBaseLoc().initialize(Context, SourceLocation()); 2891 } else { 2892 TL.setHasBaseTypeAsWritten(true); 2893 Visit(TL.getBaseLoc()); 2894 } 2895 2896 // Protocol qualifiers. 2897 if (DS.getProtocolQualifiers()) { 2898 assert(TL.getNumProtocols() > 0); 2899 assert(TL.getNumProtocols() == DS.getNumProtocolQualifiers()); 2900 TL.setLAngleLoc(DS.getProtocolLAngleLoc()); 2901 TL.setRAngleLoc(DS.getSourceRange().getEnd()); 2902 for (unsigned i = 0, e = DS.getNumProtocolQualifiers(); i != e; ++i) 2903 TL.setProtocolLoc(i, DS.getProtocolLocs()[i]); 2904 } else { 2905 assert(TL.getNumProtocols() == 0); 2906 TL.setLAngleLoc(SourceLocation()); 2907 TL.setRAngleLoc(SourceLocation()); 2908 } 2909 } 2910 void VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL) { 2911 TL.setStarLoc(SourceLocation()); 2912 Visit(TL.getPointeeLoc()); 2913 } 2914 void VisitTemplateSpecializationTypeLoc(TemplateSpecializationTypeLoc TL) { 2915 TypeSourceInfo *TInfo = 0; 2916 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 2917 2918 // If we got no declarator info from previous Sema routines, 2919 // just fill with the typespec loc. 2920 if (!TInfo) { 2921 TL.initialize(Context, DS.getTypeSpecTypeNameLoc()); 2922 return; 2923 } 2924 2925 TypeLoc OldTL = TInfo->getTypeLoc(); 2926 if (TInfo->getType()->getAs<ElaboratedType>()) { 2927 ElaboratedTypeLoc ElabTL = cast<ElaboratedTypeLoc>(OldTL); 2928 TemplateSpecializationTypeLoc NamedTL = 2929 cast<TemplateSpecializationTypeLoc>(ElabTL.getNamedTypeLoc()); 2930 TL.copy(NamedTL); 2931 } 2932 else 2933 TL.copy(cast<TemplateSpecializationTypeLoc>(OldTL)); 2934 } 2935 void VisitTypeOfExprTypeLoc(TypeOfExprTypeLoc TL) { 2936 assert(DS.getTypeSpecType() == DeclSpec::TST_typeofExpr); 2937 TL.setTypeofLoc(DS.getTypeSpecTypeLoc()); 2938 TL.setParensRange(DS.getTypeofParensRange()); 2939 } 2940 void VisitTypeOfTypeLoc(TypeOfTypeLoc TL) { 2941 assert(DS.getTypeSpecType() == DeclSpec::TST_typeofType); 2942 TL.setTypeofLoc(DS.getTypeSpecTypeLoc()); 2943 TL.setParensRange(DS.getTypeofParensRange()); 2944 assert(DS.getRepAsType()); 2945 TypeSourceInfo *TInfo = 0; 2946 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 2947 TL.setUnderlyingTInfo(TInfo); 2948 } 2949 void VisitUnaryTransformTypeLoc(UnaryTransformTypeLoc TL) { 2950 // FIXME: This holds only because we only have one unary transform. 2951 assert(DS.getTypeSpecType() == DeclSpec::TST_underlyingType); 2952 TL.setKWLoc(DS.getTypeSpecTypeLoc()); 2953 TL.setParensRange(DS.getTypeofParensRange()); 2954 assert(DS.getRepAsType()); 2955 TypeSourceInfo *TInfo = 0; 2956 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 2957 TL.setUnderlyingTInfo(TInfo); 2958 } 2959 void VisitBuiltinTypeLoc(BuiltinTypeLoc TL) { 2960 // By default, use the source location of the type specifier. 2961 TL.setBuiltinLoc(DS.getTypeSpecTypeLoc()); 2962 if (TL.needsExtraLocalData()) { 2963 // Set info for the written builtin specifiers. 2964 TL.getWrittenBuiltinSpecs() = DS.getWrittenBuiltinSpecs(); 2965 // Try to have a meaningful source location. 2966 if (TL.getWrittenSignSpec() != TSS_unspecified) 2967 // Sign spec loc overrides the others (e.g., 'unsigned long'). 2968 TL.setBuiltinLoc(DS.getTypeSpecSignLoc()); 2969 else if (TL.getWrittenWidthSpec() != TSW_unspecified) 2970 // Width spec loc overrides type spec loc (e.g., 'short int'). 2971 TL.setBuiltinLoc(DS.getTypeSpecWidthLoc()); 2972 } 2973 } 2974 void VisitElaboratedTypeLoc(ElaboratedTypeLoc TL) { 2975 ElaboratedTypeKeyword Keyword 2976 = TypeWithKeyword::getKeywordForTypeSpec(DS.getTypeSpecType()); 2977 if (DS.getTypeSpecType() == TST_typename) { 2978 TypeSourceInfo *TInfo = 0; 2979 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 2980 if (TInfo) { 2981 TL.copy(cast<ElaboratedTypeLoc>(TInfo->getTypeLoc())); 2982 return; 2983 } 2984 } 2985 TL.setElaboratedKeywordLoc(Keyword != ETK_None 2986 ? DS.getTypeSpecTypeLoc() 2987 : SourceLocation()); 2988 const CXXScopeSpec& SS = DS.getTypeSpecScope(); 2989 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 2990 Visit(TL.getNextTypeLoc().getUnqualifiedLoc()); 2991 } 2992 void VisitDependentNameTypeLoc(DependentNameTypeLoc TL) { 2993 assert(DS.getTypeSpecType() == TST_typename); 2994 TypeSourceInfo *TInfo = 0; 2995 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 2996 assert(TInfo); 2997 TL.copy(cast<DependentNameTypeLoc>(TInfo->getTypeLoc())); 2998 } 2999 void VisitDependentTemplateSpecializationTypeLoc( 3000 DependentTemplateSpecializationTypeLoc TL) { 3001 assert(DS.getTypeSpecType() == TST_typename); 3002 TypeSourceInfo *TInfo = 0; 3003 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 3004 assert(TInfo); 3005 TL.copy(cast<DependentTemplateSpecializationTypeLoc>( 3006 TInfo->getTypeLoc())); 3007 } 3008 void VisitTagTypeLoc(TagTypeLoc TL) { 3009 TL.setNameLoc(DS.getTypeSpecTypeNameLoc()); 3010 } 3011 void VisitAtomicTypeLoc(AtomicTypeLoc TL) { 3012 TL.setKWLoc(DS.getTypeSpecTypeLoc()); 3013 TL.setParensRange(DS.getTypeofParensRange()); 3014 3015 TypeSourceInfo *TInfo = 0; 3016 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 3017 TL.getValueLoc().initializeFullCopy(TInfo->getTypeLoc()); 3018 } 3019 3020 void VisitTypeLoc(TypeLoc TL) { 3021 // FIXME: add other typespec types and change this to an assert. 3022 TL.initialize(Context, DS.getTypeSpecTypeLoc()); 3023 } 3024 }; 3025 3026 class DeclaratorLocFiller : public TypeLocVisitor<DeclaratorLocFiller> { 3027 ASTContext &Context; 3028 const DeclaratorChunk &Chunk; 3029 3030 public: 3031 DeclaratorLocFiller(ASTContext &Context, const DeclaratorChunk &Chunk) 3032 : Context(Context), Chunk(Chunk) {} 3033 3034 void VisitQualifiedTypeLoc(QualifiedTypeLoc TL) { 3035 llvm_unreachable("qualified type locs not expected here!"); 3036 } 3037 3038 void VisitAttributedTypeLoc(AttributedTypeLoc TL) { 3039 fillAttributedTypeLoc(TL, Chunk.getAttrs()); 3040 } 3041 void VisitBlockPointerTypeLoc(BlockPointerTypeLoc TL) { 3042 assert(Chunk.Kind == DeclaratorChunk::BlockPointer); 3043 TL.setCaretLoc(Chunk.Loc); 3044 } 3045 void VisitPointerTypeLoc(PointerTypeLoc TL) { 3046 assert(Chunk.Kind == DeclaratorChunk::Pointer); 3047 TL.setStarLoc(Chunk.Loc); 3048 } 3049 void VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL) { 3050 assert(Chunk.Kind == DeclaratorChunk::Pointer); 3051 TL.setStarLoc(Chunk.Loc); 3052 } 3053 void VisitMemberPointerTypeLoc(MemberPointerTypeLoc TL) { 3054 assert(Chunk.Kind == DeclaratorChunk::MemberPointer); 3055 const CXXScopeSpec& SS = Chunk.Mem.Scope(); 3056 NestedNameSpecifierLoc NNSLoc = SS.getWithLocInContext(Context); 3057 3058 const Type* ClsTy = TL.getClass(); 3059 QualType ClsQT = QualType(ClsTy, 0); 3060 TypeSourceInfo *ClsTInfo = Context.CreateTypeSourceInfo(ClsQT, 0); 3061 // Now copy source location info into the type loc component. 3062 TypeLoc ClsTL = ClsTInfo->getTypeLoc(); 3063 switch (NNSLoc.getNestedNameSpecifier()->getKind()) { 3064 case NestedNameSpecifier::Identifier: 3065 assert(isa<DependentNameType>(ClsTy) && "Unexpected TypeLoc"); 3066 { 3067 DependentNameTypeLoc DNTLoc = cast<DependentNameTypeLoc>(ClsTL); 3068 DNTLoc.setElaboratedKeywordLoc(SourceLocation()); 3069 DNTLoc.setQualifierLoc(NNSLoc.getPrefix()); 3070 DNTLoc.setNameLoc(NNSLoc.getLocalBeginLoc()); 3071 } 3072 break; 3073 3074 case NestedNameSpecifier::TypeSpec: 3075 case NestedNameSpecifier::TypeSpecWithTemplate: 3076 if (isa<ElaboratedType>(ClsTy)) { 3077 ElaboratedTypeLoc ETLoc = *cast<ElaboratedTypeLoc>(&ClsTL); 3078 ETLoc.setElaboratedKeywordLoc(SourceLocation()); 3079 ETLoc.setQualifierLoc(NNSLoc.getPrefix()); 3080 TypeLoc NamedTL = ETLoc.getNamedTypeLoc(); 3081 NamedTL.initializeFullCopy(NNSLoc.getTypeLoc()); 3082 } else { 3083 ClsTL.initializeFullCopy(NNSLoc.getTypeLoc()); 3084 } 3085 break; 3086 3087 case NestedNameSpecifier::Namespace: 3088 case NestedNameSpecifier::NamespaceAlias: 3089 case NestedNameSpecifier::Global: 3090 llvm_unreachable("Nested-name-specifier must name a type"); 3091 } 3092 3093 // Finally fill in MemberPointerLocInfo fields. 3094 TL.setStarLoc(Chunk.Loc); 3095 TL.setClassTInfo(ClsTInfo); 3096 } 3097 void VisitLValueReferenceTypeLoc(LValueReferenceTypeLoc TL) { 3098 assert(Chunk.Kind == DeclaratorChunk::Reference); 3099 // 'Amp' is misleading: this might have been originally 3100 /// spelled with AmpAmp. 3101 TL.setAmpLoc(Chunk.Loc); 3102 } 3103 void VisitRValueReferenceTypeLoc(RValueReferenceTypeLoc TL) { 3104 assert(Chunk.Kind == DeclaratorChunk::Reference); 3105 assert(!Chunk.Ref.LValueRef); 3106 TL.setAmpAmpLoc(Chunk.Loc); 3107 } 3108 void VisitArrayTypeLoc(ArrayTypeLoc TL) { 3109 assert(Chunk.Kind == DeclaratorChunk::Array); 3110 TL.setLBracketLoc(Chunk.Loc); 3111 TL.setRBracketLoc(Chunk.EndLoc); 3112 TL.setSizeExpr(static_cast<Expr*>(Chunk.Arr.NumElts)); 3113 } 3114 void VisitFunctionTypeLoc(FunctionTypeLoc TL) { 3115 assert(Chunk.Kind == DeclaratorChunk::Function); 3116 TL.setLocalRangeBegin(Chunk.Loc); 3117 TL.setLocalRangeEnd(Chunk.EndLoc); 3118 TL.setTrailingReturn(!!Chunk.Fun.TrailingReturnType); 3119 3120 const DeclaratorChunk::FunctionTypeInfo &FTI = Chunk.Fun; 3121 for (unsigned i = 0, e = TL.getNumArgs(), tpi = 0; i != e; ++i) { 3122 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 3123 TL.setArg(tpi++, Param); 3124 } 3125 // FIXME: exception specs 3126 } 3127 void VisitParenTypeLoc(ParenTypeLoc TL) { 3128 assert(Chunk.Kind == DeclaratorChunk::Paren); 3129 TL.setLParenLoc(Chunk.Loc); 3130 TL.setRParenLoc(Chunk.EndLoc); 3131 } 3132 3133 void VisitTypeLoc(TypeLoc TL) { 3134 llvm_unreachable("unsupported TypeLoc kind in declarator!"); 3135 } 3136 }; 3137} 3138 3139/// \brief Create and instantiate a TypeSourceInfo with type source information. 3140/// 3141/// \param T QualType referring to the type as written in source code. 3142/// 3143/// \param ReturnTypeInfo For declarators whose return type does not show 3144/// up in the normal place in the declaration specifiers (such as a C++ 3145/// conversion function), this pointer will refer to a type source information 3146/// for that return type. 3147TypeSourceInfo * 3148Sema::GetTypeSourceInfoForDeclarator(Declarator &D, QualType T, 3149 TypeSourceInfo *ReturnTypeInfo) { 3150 TypeSourceInfo *TInfo = Context.CreateTypeSourceInfo(T); 3151 UnqualTypeLoc CurrTL = TInfo->getTypeLoc().getUnqualifiedLoc(); 3152 3153 // Handle parameter packs whose type is a pack expansion. 3154 if (isa<PackExpansionType>(T)) { 3155 cast<PackExpansionTypeLoc>(CurrTL).setEllipsisLoc(D.getEllipsisLoc()); 3156 CurrTL = CurrTL.getNextTypeLoc().getUnqualifiedLoc(); 3157 } 3158 3159 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 3160 while (isa<AttributedTypeLoc>(CurrTL)) { 3161 AttributedTypeLoc TL = cast<AttributedTypeLoc>(CurrTL); 3162 fillAttributedTypeLoc(TL, D.getTypeObject(i).getAttrs()); 3163 CurrTL = TL.getNextTypeLoc().getUnqualifiedLoc(); 3164 } 3165 3166 DeclaratorLocFiller(Context, D.getTypeObject(i)).Visit(CurrTL); 3167 CurrTL = CurrTL.getNextTypeLoc().getUnqualifiedLoc(); 3168 } 3169 3170 // If we have different source information for the return type, use 3171 // that. This really only applies to C++ conversion functions. 3172 if (ReturnTypeInfo) { 3173 TypeLoc TL = ReturnTypeInfo->getTypeLoc(); 3174 assert(TL.getFullDataSize() == CurrTL.getFullDataSize()); 3175 memcpy(CurrTL.getOpaqueData(), TL.getOpaqueData(), TL.getFullDataSize()); 3176 } else { 3177 TypeSpecLocFiller(Context, D.getDeclSpec()).Visit(CurrTL); 3178 } 3179 3180 return TInfo; 3181} 3182 3183/// \brief Create a LocInfoType to hold the given QualType and TypeSourceInfo. 3184ParsedType Sema::CreateParsedType(QualType T, TypeSourceInfo *TInfo) { 3185 // FIXME: LocInfoTypes are "transient", only needed for passing to/from Parser 3186 // and Sema during declaration parsing. Try deallocating/caching them when 3187 // it's appropriate, instead of allocating them and keeping them around. 3188 LocInfoType *LocT = (LocInfoType*)BumpAlloc.Allocate(sizeof(LocInfoType), 3189 TypeAlignment); 3190 new (LocT) LocInfoType(T, TInfo); 3191 assert(LocT->getTypeClass() != T->getTypeClass() && 3192 "LocInfoType's TypeClass conflicts with an existing Type class"); 3193 return ParsedType::make(QualType(LocT, 0)); 3194} 3195 3196void LocInfoType::getAsStringInternal(std::string &Str, 3197 const PrintingPolicy &Policy) const { 3198 llvm_unreachable("LocInfoType leaked into the type system; an opaque TypeTy*" 3199 " was used directly instead of getting the QualType through" 3200 " GetTypeFromParser"); 3201} 3202 3203TypeResult Sema::ActOnTypeName(Scope *S, Declarator &D) { 3204 // C99 6.7.6: Type names have no identifier. This is already validated by 3205 // the parser. 3206 assert(D.getIdentifier() == 0 && "Type name should have no identifier!"); 3207 3208 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 3209 QualType T = TInfo->getType(); 3210 if (D.isInvalidType()) 3211 return true; 3212 3213 // Make sure there are no unused decl attributes on the declarator. 3214 // We don't want to do this for ObjC parameters because we're going 3215 // to apply them to the actual parameter declaration. 3216 if (D.getContext() != Declarator::ObjCParameterContext) 3217 checkUnusedDeclAttributes(D); 3218 3219 if (getLangOpts().CPlusPlus) { 3220 // Check that there are no default arguments (C++ only). 3221 CheckExtraCXXDefaultArguments(D); 3222 } 3223 3224 return CreateParsedType(T, TInfo); 3225} 3226 3227ParsedType Sema::ActOnObjCInstanceType(SourceLocation Loc) { 3228 QualType T = Context.getObjCInstanceType(); 3229 TypeSourceInfo *TInfo = Context.getTrivialTypeSourceInfo(T, Loc); 3230 return CreateParsedType(T, TInfo); 3231} 3232 3233 3234//===----------------------------------------------------------------------===// 3235// Type Attribute Processing 3236//===----------------------------------------------------------------------===// 3237 3238/// HandleAddressSpaceTypeAttribute - Process an address_space attribute on the 3239/// specified type. The attribute contains 1 argument, the id of the address 3240/// space for the type. 3241static void HandleAddressSpaceTypeAttribute(QualType &Type, 3242 const AttributeList &Attr, Sema &S){ 3243 3244 // If this type is already address space qualified, reject it. 3245 // ISO/IEC TR 18037 S5.3 (amending C99 6.7.3): "No type shall be qualified by 3246 // qualifiers for two or more different address spaces." 3247 if (Type.getAddressSpace()) { 3248 S.Diag(Attr.getLoc(), diag::err_attribute_address_multiple_qualifiers); 3249 Attr.setInvalid(); 3250 return; 3251 } 3252 3253 // ISO/IEC TR 18037 S5.3 (amending C99 6.7.3): "A function type shall not be 3254 // qualified by an address-space qualifier." 3255 if (Type->isFunctionType()) { 3256 S.Diag(Attr.getLoc(), diag::err_attribute_address_function_type); 3257 Attr.setInvalid(); 3258 return; 3259 } 3260 3261 // Check the attribute arguments. 3262 if (Attr.getNumArgs() != 1) { 3263 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 3264 Attr.setInvalid(); 3265 return; 3266 } 3267 Expr *ASArgExpr = static_cast<Expr *>(Attr.getArg(0)); 3268 llvm::APSInt addrSpace(32); 3269 if (ASArgExpr->isTypeDependent() || ASArgExpr->isValueDependent() || 3270 !ASArgExpr->isIntegerConstantExpr(addrSpace, S.Context)) { 3271 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_not_int) 3272 << ASArgExpr->getSourceRange(); 3273 Attr.setInvalid(); 3274 return; 3275 } 3276 3277 // Bounds checking. 3278 if (addrSpace.isSigned()) { 3279 if (addrSpace.isNegative()) { 3280 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_negative) 3281 << ASArgExpr->getSourceRange(); 3282 Attr.setInvalid(); 3283 return; 3284 } 3285 addrSpace.setIsSigned(false); 3286 } 3287 llvm::APSInt max(addrSpace.getBitWidth()); 3288 max = Qualifiers::MaxAddressSpace; 3289 if (addrSpace > max) { 3290 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_too_high) 3291 << Qualifiers::MaxAddressSpace << ASArgExpr->getSourceRange(); 3292 Attr.setInvalid(); 3293 return; 3294 } 3295 3296 unsigned ASIdx = static_cast<unsigned>(addrSpace.getZExtValue()); 3297 Type = S.Context.getAddrSpaceQualType(Type, ASIdx); 3298} 3299 3300/// Does this type have a "direct" ownership qualifier? That is, 3301/// is it written like "__strong id", as opposed to something like 3302/// "typeof(foo)", where that happens to be strong? 3303static bool hasDirectOwnershipQualifier(QualType type) { 3304 // Fast path: no qualifier at all. 3305 assert(type.getQualifiers().hasObjCLifetime()); 3306 3307 while (true) { 3308 // __strong id 3309 if (const AttributedType *attr = dyn_cast<AttributedType>(type)) { 3310 if (attr->getAttrKind() == AttributedType::attr_objc_ownership) 3311 return true; 3312 3313 type = attr->getModifiedType(); 3314 3315 // X *__strong (...) 3316 } else if (const ParenType *paren = dyn_cast<ParenType>(type)) { 3317 type = paren->getInnerType(); 3318 3319 // That's it for things we want to complain about. In particular, 3320 // we do not want to look through typedefs, typeof(expr), 3321 // typeof(type), or any other way that the type is somehow 3322 // abstracted. 3323 } else { 3324 3325 return false; 3326 } 3327 } 3328} 3329 3330/// handleObjCOwnershipTypeAttr - Process an objc_ownership 3331/// attribute on the specified type. 3332/// 3333/// Returns 'true' if the attribute was handled. 3334static bool handleObjCOwnershipTypeAttr(TypeProcessingState &state, 3335 AttributeList &attr, 3336 QualType &type) { 3337 bool NonObjCPointer = false; 3338 3339 if (!type->isDependentType()) { 3340 if (const PointerType *ptr = type->getAs<PointerType>()) { 3341 QualType pointee = ptr->getPointeeType(); 3342 if (pointee->isObjCRetainableType() || pointee->isPointerType()) 3343 return false; 3344 // It is important not to lose the source info that there was an attribute 3345 // applied to non-objc pointer. We will create an attributed type but 3346 // its type will be the same as the original type. 3347 NonObjCPointer = true; 3348 } else if (!type->isObjCRetainableType()) { 3349 return false; 3350 } 3351 } 3352 3353 Sema &S = state.getSema(); 3354 SourceLocation AttrLoc = attr.getLoc(); 3355 if (AttrLoc.isMacroID()) 3356 AttrLoc = S.getSourceManager().getImmediateExpansionRange(AttrLoc).first; 3357 3358 if (!attr.getParameterName()) { 3359 S.Diag(AttrLoc, diag::err_attribute_argument_n_not_string) 3360 << "objc_ownership" << 1; 3361 attr.setInvalid(); 3362 return true; 3363 } 3364 3365 // Consume lifetime attributes without further comment outside of 3366 // ARC mode. 3367 if (!S.getLangOpts().ObjCAutoRefCount) 3368 return true; 3369 3370 Qualifiers::ObjCLifetime lifetime; 3371 if (attr.getParameterName()->isStr("none")) 3372 lifetime = Qualifiers::OCL_ExplicitNone; 3373 else if (attr.getParameterName()->isStr("strong")) 3374 lifetime = Qualifiers::OCL_Strong; 3375 else if (attr.getParameterName()->isStr("weak")) 3376 lifetime = Qualifiers::OCL_Weak; 3377 else if (attr.getParameterName()->isStr("autoreleasing")) 3378 lifetime = Qualifiers::OCL_Autoreleasing; 3379 else { 3380 S.Diag(AttrLoc, diag::warn_attribute_type_not_supported) 3381 << "objc_ownership" << attr.getParameterName(); 3382 attr.setInvalid(); 3383 return true; 3384 } 3385 3386 SplitQualType underlyingType = type.split(); 3387 3388 // Check for redundant/conflicting ownership qualifiers. 3389 if (Qualifiers::ObjCLifetime previousLifetime 3390 = type.getQualifiers().getObjCLifetime()) { 3391 // If it's written directly, that's an error. 3392 if (hasDirectOwnershipQualifier(type)) { 3393 S.Diag(AttrLoc, diag::err_attr_objc_ownership_redundant) 3394 << type; 3395 return true; 3396 } 3397 3398 // Otherwise, if the qualifiers actually conflict, pull sugar off 3399 // until we reach a type that is directly qualified. 3400 if (previousLifetime != lifetime) { 3401 // This should always terminate: the canonical type is 3402 // qualified, so some bit of sugar must be hiding it. 3403 while (!underlyingType.Quals.hasObjCLifetime()) { 3404 underlyingType = underlyingType.getSingleStepDesugaredType(); 3405 } 3406 underlyingType.Quals.removeObjCLifetime(); 3407 } 3408 } 3409 3410 underlyingType.Quals.addObjCLifetime(lifetime); 3411 3412 if (NonObjCPointer) { 3413 StringRef name = attr.getName()->getName(); 3414 switch (lifetime) { 3415 case Qualifiers::OCL_None: 3416 case Qualifiers::OCL_ExplicitNone: 3417 break; 3418 case Qualifiers::OCL_Strong: name = "__strong"; break; 3419 case Qualifiers::OCL_Weak: name = "__weak"; break; 3420 case Qualifiers::OCL_Autoreleasing: name = "__autoreleasing"; break; 3421 } 3422 S.Diag(AttrLoc, diag::warn_objc_object_attribute_wrong_type) 3423 << name << type; 3424 } 3425 3426 QualType origType = type; 3427 if (!NonObjCPointer) 3428 type = S.Context.getQualifiedType(underlyingType); 3429 3430 // If we have a valid source location for the attribute, use an 3431 // AttributedType instead. 3432 if (AttrLoc.isValid()) 3433 type = S.Context.getAttributedType(AttributedType::attr_objc_ownership, 3434 origType, type); 3435 3436 // Forbid __weak if the runtime doesn't support it. 3437 if (lifetime == Qualifiers::OCL_Weak && 3438 !S.getLangOpts().ObjCRuntimeHasWeak && !NonObjCPointer) { 3439 3440 // Actually, delay this until we know what we're parsing. 3441 if (S.DelayedDiagnostics.shouldDelayDiagnostics()) { 3442 S.DelayedDiagnostics.add( 3443 sema::DelayedDiagnostic::makeForbiddenType( 3444 S.getSourceManager().getExpansionLoc(AttrLoc), 3445 diag::err_arc_weak_no_runtime, type, /*ignored*/ 0)); 3446 } else { 3447 S.Diag(AttrLoc, diag::err_arc_weak_no_runtime); 3448 } 3449 3450 attr.setInvalid(); 3451 return true; 3452 } 3453 3454 // Forbid __weak for class objects marked as 3455 // objc_arc_weak_reference_unavailable 3456 if (lifetime == Qualifiers::OCL_Weak) { 3457 QualType T = type; 3458 while (const PointerType *ptr = T->getAs<PointerType>()) 3459 T = ptr->getPointeeType(); 3460 if (const ObjCObjectPointerType *ObjT = T->getAs<ObjCObjectPointerType>()) { 3461 ObjCInterfaceDecl *Class = ObjT->getInterfaceDecl(); 3462 if (Class->isArcWeakrefUnavailable()) { 3463 S.Diag(AttrLoc, diag::err_arc_unsupported_weak_class); 3464 S.Diag(ObjT->getInterfaceDecl()->getLocation(), 3465 diag::note_class_declared); 3466 } 3467 } 3468 } 3469 3470 return true; 3471} 3472 3473/// handleObjCGCTypeAttr - Process the __attribute__((objc_gc)) type 3474/// attribute on the specified type. Returns true to indicate that 3475/// the attribute was handled, false to indicate that the type does 3476/// not permit the attribute. 3477static bool handleObjCGCTypeAttr(TypeProcessingState &state, 3478 AttributeList &attr, 3479 QualType &type) { 3480 Sema &S = state.getSema(); 3481 3482 // Delay if this isn't some kind of pointer. 3483 if (!type->isPointerType() && 3484 !type->isObjCObjectPointerType() && 3485 !type->isBlockPointerType()) 3486 return false; 3487 3488 if (type.getObjCGCAttr() != Qualifiers::GCNone) { 3489 S.Diag(attr.getLoc(), diag::err_attribute_multiple_objc_gc); 3490 attr.setInvalid(); 3491 return true; 3492 } 3493 3494 // Check the attribute arguments. 3495 if (!attr.getParameterName()) { 3496 S.Diag(attr.getLoc(), diag::err_attribute_argument_n_not_string) 3497 << "objc_gc" << 1; 3498 attr.setInvalid(); 3499 return true; 3500 } 3501 Qualifiers::GC GCAttr; 3502 if (attr.getNumArgs() != 0) { 3503 S.Diag(attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 3504 attr.setInvalid(); 3505 return true; 3506 } 3507 if (attr.getParameterName()->isStr("weak")) 3508 GCAttr = Qualifiers::Weak; 3509 else if (attr.getParameterName()->isStr("strong")) 3510 GCAttr = Qualifiers::Strong; 3511 else { 3512 S.Diag(attr.getLoc(), diag::warn_attribute_type_not_supported) 3513 << "objc_gc" << attr.getParameterName(); 3514 attr.setInvalid(); 3515 return true; 3516 } 3517 3518 QualType origType = type; 3519 type = S.Context.getObjCGCQualType(origType, GCAttr); 3520 3521 // Make an attributed type to preserve the source information. 3522 if (attr.getLoc().isValid()) 3523 type = S.Context.getAttributedType(AttributedType::attr_objc_gc, 3524 origType, type); 3525 3526 return true; 3527} 3528 3529namespace { 3530 /// A helper class to unwrap a type down to a function for the 3531 /// purposes of applying attributes there. 3532 /// 3533 /// Use: 3534 /// FunctionTypeUnwrapper unwrapped(SemaRef, T); 3535 /// if (unwrapped.isFunctionType()) { 3536 /// const FunctionType *fn = unwrapped.get(); 3537 /// // change fn somehow 3538 /// T = unwrapped.wrap(fn); 3539 /// } 3540 struct FunctionTypeUnwrapper { 3541 enum WrapKind { 3542 Desugar, 3543 Parens, 3544 Pointer, 3545 BlockPointer, 3546 Reference, 3547 MemberPointer 3548 }; 3549 3550 QualType Original; 3551 const FunctionType *Fn; 3552 SmallVector<unsigned char /*WrapKind*/, 8> Stack; 3553 3554 FunctionTypeUnwrapper(Sema &S, QualType T) : Original(T) { 3555 while (true) { 3556 const Type *Ty = T.getTypePtr(); 3557 if (isa<FunctionType>(Ty)) { 3558 Fn = cast<FunctionType>(Ty); 3559 return; 3560 } else if (isa<ParenType>(Ty)) { 3561 T = cast<ParenType>(Ty)->getInnerType(); 3562 Stack.push_back(Parens); 3563 } else if (isa<PointerType>(Ty)) { 3564 T = cast<PointerType>(Ty)->getPointeeType(); 3565 Stack.push_back(Pointer); 3566 } else if (isa<BlockPointerType>(Ty)) { 3567 T = cast<BlockPointerType>(Ty)->getPointeeType(); 3568 Stack.push_back(BlockPointer); 3569 } else if (isa<MemberPointerType>(Ty)) { 3570 T = cast<MemberPointerType>(Ty)->getPointeeType(); 3571 Stack.push_back(MemberPointer); 3572 } else if (isa<ReferenceType>(Ty)) { 3573 T = cast<ReferenceType>(Ty)->getPointeeType(); 3574 Stack.push_back(Reference); 3575 } else { 3576 const Type *DTy = Ty->getUnqualifiedDesugaredType(); 3577 if (Ty == DTy) { 3578 Fn = 0; 3579 return; 3580 } 3581 3582 T = QualType(DTy, 0); 3583 Stack.push_back(Desugar); 3584 } 3585 } 3586 } 3587 3588 bool isFunctionType() const { return (Fn != 0); } 3589 const FunctionType *get() const { return Fn; } 3590 3591 QualType wrap(Sema &S, const FunctionType *New) { 3592 // If T wasn't modified from the unwrapped type, do nothing. 3593 if (New == get()) return Original; 3594 3595 Fn = New; 3596 return wrap(S.Context, Original, 0); 3597 } 3598 3599 private: 3600 QualType wrap(ASTContext &C, QualType Old, unsigned I) { 3601 if (I == Stack.size()) 3602 return C.getQualifiedType(Fn, Old.getQualifiers()); 3603 3604 // Build up the inner type, applying the qualifiers from the old 3605 // type to the new type. 3606 SplitQualType SplitOld = Old.split(); 3607 3608 // As a special case, tail-recurse if there are no qualifiers. 3609 if (SplitOld.Quals.empty()) 3610 return wrap(C, SplitOld.Ty, I); 3611 return C.getQualifiedType(wrap(C, SplitOld.Ty, I), SplitOld.Quals); 3612 } 3613 3614 QualType wrap(ASTContext &C, const Type *Old, unsigned I) { 3615 if (I == Stack.size()) return QualType(Fn, 0); 3616 3617 switch (static_cast<WrapKind>(Stack[I++])) { 3618 case Desugar: 3619 // This is the point at which we potentially lose source 3620 // information. 3621 return wrap(C, Old->getUnqualifiedDesugaredType(), I); 3622 3623 case Parens: { 3624 QualType New = wrap(C, cast<ParenType>(Old)->getInnerType(), I); 3625 return C.getParenType(New); 3626 } 3627 3628 case Pointer: { 3629 QualType New = wrap(C, cast<PointerType>(Old)->getPointeeType(), I); 3630 return C.getPointerType(New); 3631 } 3632 3633 case BlockPointer: { 3634 QualType New = wrap(C, cast<BlockPointerType>(Old)->getPointeeType(),I); 3635 return C.getBlockPointerType(New); 3636 } 3637 3638 case MemberPointer: { 3639 const MemberPointerType *OldMPT = cast<MemberPointerType>(Old); 3640 QualType New = wrap(C, OldMPT->getPointeeType(), I); 3641 return C.getMemberPointerType(New, OldMPT->getClass()); 3642 } 3643 3644 case Reference: { 3645 const ReferenceType *OldRef = cast<ReferenceType>(Old); 3646 QualType New = wrap(C, OldRef->getPointeeType(), I); 3647 if (isa<LValueReferenceType>(OldRef)) 3648 return C.getLValueReferenceType(New, OldRef->isSpelledAsLValue()); 3649 else 3650 return C.getRValueReferenceType(New); 3651 } 3652 } 3653 3654 llvm_unreachable("unknown wrapping kind"); 3655 } 3656 }; 3657} 3658 3659/// Process an individual function attribute. Returns true to 3660/// indicate that the attribute was handled, false if it wasn't. 3661static bool handleFunctionTypeAttr(TypeProcessingState &state, 3662 AttributeList &attr, 3663 QualType &type) { 3664 Sema &S = state.getSema(); 3665 3666 FunctionTypeUnwrapper unwrapped(S, type); 3667 3668 if (attr.getKind() == AttributeList::AT_noreturn) { 3669 if (S.CheckNoReturnAttr(attr)) 3670 return true; 3671 3672 // Delay if this is not a function type. 3673 if (!unwrapped.isFunctionType()) 3674 return false; 3675 3676 // Otherwise we can process right away. 3677 FunctionType::ExtInfo EI = unwrapped.get()->getExtInfo().withNoReturn(true); 3678 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 3679 return true; 3680 } 3681 3682 // ns_returns_retained is not always a type attribute, but if we got 3683 // here, we're treating it as one right now. 3684 if (attr.getKind() == AttributeList::AT_ns_returns_retained) { 3685 assert(S.getLangOpts().ObjCAutoRefCount && 3686 "ns_returns_retained treated as type attribute in non-ARC"); 3687 if (attr.getNumArgs()) return true; 3688 3689 // Delay if this is not a function type. 3690 if (!unwrapped.isFunctionType()) 3691 return false; 3692 3693 FunctionType::ExtInfo EI 3694 = unwrapped.get()->getExtInfo().withProducesResult(true); 3695 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 3696 return true; 3697 } 3698 3699 if (attr.getKind() == AttributeList::AT_regparm) { 3700 unsigned value; 3701 if (S.CheckRegparmAttr(attr, value)) 3702 return true; 3703 3704 // Delay if this is not a function type. 3705 if (!unwrapped.isFunctionType()) 3706 return false; 3707 3708 // Diagnose regparm with fastcall. 3709 const FunctionType *fn = unwrapped.get(); 3710 CallingConv CC = fn->getCallConv(); 3711 if (CC == CC_X86FastCall) { 3712 S.Diag(attr.getLoc(), diag::err_attributes_are_not_compatible) 3713 << FunctionType::getNameForCallConv(CC) 3714 << "regparm"; 3715 attr.setInvalid(); 3716 return true; 3717 } 3718 3719 FunctionType::ExtInfo EI = 3720 unwrapped.get()->getExtInfo().withRegParm(value); 3721 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 3722 return true; 3723 } 3724 3725 // Otherwise, a calling convention. 3726 CallingConv CC; 3727 if (S.CheckCallingConvAttr(attr, CC)) 3728 return true; 3729 3730 // Delay if the type didn't work out to a function. 3731 if (!unwrapped.isFunctionType()) return false; 3732 3733 const FunctionType *fn = unwrapped.get(); 3734 CallingConv CCOld = fn->getCallConv(); 3735 if (S.Context.getCanonicalCallConv(CC) == 3736 S.Context.getCanonicalCallConv(CCOld)) { 3737 FunctionType::ExtInfo EI= unwrapped.get()->getExtInfo().withCallingConv(CC); 3738 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 3739 return true; 3740 } 3741 3742 if (CCOld != (S.LangOpts.MRTD ? CC_X86StdCall : CC_Default)) { 3743 // Should we diagnose reapplications of the same convention? 3744 S.Diag(attr.getLoc(), diag::err_attributes_are_not_compatible) 3745 << FunctionType::getNameForCallConv(CC) 3746 << FunctionType::getNameForCallConv(CCOld); 3747 attr.setInvalid(); 3748 return true; 3749 } 3750 3751 // Diagnose the use of X86 fastcall on varargs or unprototyped functions. 3752 if (CC == CC_X86FastCall) { 3753 if (isa<FunctionNoProtoType>(fn)) { 3754 S.Diag(attr.getLoc(), diag::err_cconv_knr) 3755 << FunctionType::getNameForCallConv(CC); 3756 attr.setInvalid(); 3757 return true; 3758 } 3759 3760 const FunctionProtoType *FnP = cast<FunctionProtoType>(fn); 3761 if (FnP->isVariadic()) { 3762 S.Diag(attr.getLoc(), diag::err_cconv_varargs) 3763 << FunctionType::getNameForCallConv(CC); 3764 attr.setInvalid(); 3765 return true; 3766 } 3767 3768 // Also diagnose fastcall with regparm. 3769 if (fn->getHasRegParm()) { 3770 S.Diag(attr.getLoc(), diag::err_attributes_are_not_compatible) 3771 << "regparm" 3772 << FunctionType::getNameForCallConv(CC); 3773 attr.setInvalid(); 3774 return true; 3775 } 3776 } 3777 3778 FunctionType::ExtInfo EI = unwrapped.get()->getExtInfo().withCallingConv(CC); 3779 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 3780 return true; 3781} 3782 3783/// Handle OpenCL image access qualifiers: read_only, write_only, read_write 3784static void HandleOpenCLImageAccessAttribute(QualType& CurType, 3785 const AttributeList &Attr, 3786 Sema &S) { 3787 // Check the attribute arguments. 3788 if (Attr.getNumArgs() != 1) { 3789 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 3790 Attr.setInvalid(); 3791 return; 3792 } 3793 Expr *sizeExpr = static_cast<Expr *>(Attr.getArg(0)); 3794 llvm::APSInt arg(32); 3795 if (sizeExpr->isTypeDependent() || sizeExpr->isValueDependent() || 3796 !sizeExpr->isIntegerConstantExpr(arg, S.Context)) { 3797 S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int) 3798 << "opencl_image_access" << sizeExpr->getSourceRange(); 3799 Attr.setInvalid(); 3800 return; 3801 } 3802 unsigned iarg = static_cast<unsigned>(arg.getZExtValue()); 3803 switch (iarg) { 3804 case CLIA_read_only: 3805 case CLIA_write_only: 3806 case CLIA_read_write: 3807 // Implemented in a separate patch 3808 break; 3809 default: 3810 // Implemented in a separate patch 3811 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_size) 3812 << sizeExpr->getSourceRange(); 3813 Attr.setInvalid(); 3814 break; 3815 } 3816} 3817 3818/// HandleVectorSizeAttribute - this attribute is only applicable to integral 3819/// and float scalars, although arrays, pointers, and function return values are 3820/// allowed in conjunction with this construct. Aggregates with this attribute 3821/// are invalid, even if they are of the same size as a corresponding scalar. 3822/// The raw attribute should contain precisely 1 argument, the vector size for 3823/// the variable, measured in bytes. If curType and rawAttr are well formed, 3824/// this routine will return a new vector type. 3825static void HandleVectorSizeAttr(QualType& CurType, const AttributeList &Attr, 3826 Sema &S) { 3827 // Check the attribute arguments. 3828 if (Attr.getNumArgs() != 1) { 3829 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 3830 Attr.setInvalid(); 3831 return; 3832 } 3833 Expr *sizeExpr = static_cast<Expr *>(Attr.getArg(0)); 3834 llvm::APSInt vecSize(32); 3835 if (sizeExpr->isTypeDependent() || sizeExpr->isValueDependent() || 3836 !sizeExpr->isIntegerConstantExpr(vecSize, S.Context)) { 3837 S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int) 3838 << "vector_size" << sizeExpr->getSourceRange(); 3839 Attr.setInvalid(); 3840 return; 3841 } 3842 // the base type must be integer or float, and can't already be a vector. 3843 if (!CurType->isIntegerType() && !CurType->isRealFloatingType()) { 3844 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_vector_type) << CurType; 3845 Attr.setInvalid(); 3846 return; 3847 } 3848 unsigned typeSize = static_cast<unsigned>(S.Context.getTypeSize(CurType)); 3849 // vecSize is specified in bytes - convert to bits. 3850 unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue() * 8); 3851 3852 // the vector size needs to be an integral multiple of the type size. 3853 if (vectorSize % typeSize) { 3854 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_size) 3855 << sizeExpr->getSourceRange(); 3856 Attr.setInvalid(); 3857 return; 3858 } 3859 if (vectorSize == 0) { 3860 S.Diag(Attr.getLoc(), diag::err_attribute_zero_size) 3861 << sizeExpr->getSourceRange(); 3862 Attr.setInvalid(); 3863 return; 3864 } 3865 3866 // Success! Instantiate the vector type, the number of elements is > 0, and 3867 // not required to be a power of 2, unlike GCC. 3868 CurType = S.Context.getVectorType(CurType, vectorSize/typeSize, 3869 VectorType::GenericVector); 3870} 3871 3872/// \brief Process the OpenCL-like ext_vector_type attribute when it occurs on 3873/// a type. 3874static void HandleExtVectorTypeAttr(QualType &CurType, 3875 const AttributeList &Attr, 3876 Sema &S) { 3877 Expr *sizeExpr; 3878 3879 // Special case where the argument is a template id. 3880 if (Attr.getParameterName()) { 3881 CXXScopeSpec SS; 3882 SourceLocation TemplateKWLoc; 3883 UnqualifiedId id; 3884 id.setIdentifier(Attr.getParameterName(), Attr.getLoc()); 3885 3886 ExprResult Size = S.ActOnIdExpression(S.getCurScope(), SS, TemplateKWLoc, 3887 id, false, false); 3888 if (Size.isInvalid()) 3889 return; 3890 3891 sizeExpr = Size.get(); 3892 } else { 3893 // check the attribute arguments. 3894 if (Attr.getNumArgs() != 1) { 3895 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 3896 return; 3897 } 3898 sizeExpr = Attr.getArg(0); 3899 } 3900 3901 // Create the vector type. 3902 QualType T = S.BuildExtVectorType(CurType, sizeExpr, Attr.getLoc()); 3903 if (!T.isNull()) 3904 CurType = T; 3905} 3906 3907/// HandleNeonVectorTypeAttr - The "neon_vector_type" and 3908/// "neon_polyvector_type" attributes are used to create vector types that 3909/// are mangled according to ARM's ABI. Otherwise, these types are identical 3910/// to those created with the "vector_size" attribute. Unlike "vector_size" 3911/// the argument to these Neon attributes is the number of vector elements, 3912/// not the vector size in bytes. The vector width and element type must 3913/// match one of the standard Neon vector types. 3914static void HandleNeonVectorTypeAttr(QualType& CurType, 3915 const AttributeList &Attr, Sema &S, 3916 VectorType::VectorKind VecKind, 3917 const char *AttrName) { 3918 // Check the attribute arguments. 3919 if (Attr.getNumArgs() != 1) { 3920 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 3921 Attr.setInvalid(); 3922 return; 3923 } 3924 // The number of elements must be an ICE. 3925 Expr *numEltsExpr = static_cast<Expr *>(Attr.getArg(0)); 3926 llvm::APSInt numEltsInt(32); 3927 if (numEltsExpr->isTypeDependent() || numEltsExpr->isValueDependent() || 3928 !numEltsExpr->isIntegerConstantExpr(numEltsInt, S.Context)) { 3929 S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int) 3930 << AttrName << numEltsExpr->getSourceRange(); 3931 Attr.setInvalid(); 3932 return; 3933 } 3934 // Only certain element types are supported for Neon vectors. 3935 const BuiltinType* BTy = CurType->getAs<BuiltinType>(); 3936 if (!BTy || 3937 (VecKind == VectorType::NeonPolyVector && 3938 BTy->getKind() != BuiltinType::SChar && 3939 BTy->getKind() != BuiltinType::Short) || 3940 (BTy->getKind() != BuiltinType::SChar && 3941 BTy->getKind() != BuiltinType::UChar && 3942 BTy->getKind() != BuiltinType::Short && 3943 BTy->getKind() != BuiltinType::UShort && 3944 BTy->getKind() != BuiltinType::Int && 3945 BTy->getKind() != BuiltinType::UInt && 3946 BTy->getKind() != BuiltinType::LongLong && 3947 BTy->getKind() != BuiltinType::ULongLong && 3948 BTy->getKind() != BuiltinType::Float)) { 3949 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_vector_type) <<CurType; 3950 Attr.setInvalid(); 3951 return; 3952 } 3953 // The total size of the vector must be 64 or 128 bits. 3954 unsigned typeSize = static_cast<unsigned>(S.Context.getTypeSize(CurType)); 3955 unsigned numElts = static_cast<unsigned>(numEltsInt.getZExtValue()); 3956 unsigned vecSize = typeSize * numElts; 3957 if (vecSize != 64 && vecSize != 128) { 3958 S.Diag(Attr.getLoc(), diag::err_attribute_bad_neon_vector_size) << CurType; 3959 Attr.setInvalid(); 3960 return; 3961 } 3962 3963 CurType = S.Context.getVectorType(CurType, numElts, VecKind); 3964} 3965 3966static void processTypeAttrs(TypeProcessingState &state, QualType &type, 3967 bool isDeclSpec, AttributeList *attrs) { 3968 // Scan through and apply attributes to this type where it makes sense. Some 3969 // attributes (such as __address_space__, __vector_size__, etc) apply to the 3970 // type, but others can be present in the type specifiers even though they 3971 // apply to the decl. Here we apply type attributes and ignore the rest. 3972 3973 AttributeList *next; 3974 do { 3975 AttributeList &attr = *attrs; 3976 next = attr.getNext(); 3977 3978 // Skip attributes that were marked to be invalid. 3979 if (attr.isInvalid()) 3980 continue; 3981 3982 // If this is an attribute we can handle, do so now, 3983 // otherwise, add it to the FnAttrs list for rechaining. 3984 switch (attr.getKind()) { 3985 default: break; 3986 3987 case AttributeList::AT_may_alias: 3988 // FIXME: This attribute needs to actually be handled, but if we ignore 3989 // it it breaks large amounts of Linux software. 3990 attr.setUsedAsTypeAttr(); 3991 break; 3992 case AttributeList::AT_address_space: 3993 HandleAddressSpaceTypeAttribute(type, attr, state.getSema()); 3994 attr.setUsedAsTypeAttr(); 3995 break; 3996 OBJC_POINTER_TYPE_ATTRS_CASELIST: 3997 if (!handleObjCPointerTypeAttr(state, attr, type)) 3998 distributeObjCPointerTypeAttr(state, attr, type); 3999 attr.setUsedAsTypeAttr(); 4000 break; 4001 case AttributeList::AT_vector_size: 4002 HandleVectorSizeAttr(type, attr, state.getSema()); 4003 attr.setUsedAsTypeAttr(); 4004 break; 4005 case AttributeList::AT_ext_vector_type: 4006 if (state.getDeclarator().getDeclSpec().getStorageClassSpec() 4007 != DeclSpec::SCS_typedef) 4008 HandleExtVectorTypeAttr(type, attr, state.getSema()); 4009 attr.setUsedAsTypeAttr(); 4010 break; 4011 case AttributeList::AT_neon_vector_type: 4012 HandleNeonVectorTypeAttr(type, attr, state.getSema(), 4013 VectorType::NeonVector, "neon_vector_type"); 4014 attr.setUsedAsTypeAttr(); 4015 break; 4016 case AttributeList::AT_neon_polyvector_type: 4017 HandleNeonVectorTypeAttr(type, attr, state.getSema(), 4018 VectorType::NeonPolyVector, 4019 "neon_polyvector_type"); 4020 attr.setUsedAsTypeAttr(); 4021 break; 4022 case AttributeList::AT_opencl_image_access: 4023 HandleOpenCLImageAccessAttribute(type, attr, state.getSema()); 4024 attr.setUsedAsTypeAttr(); 4025 break; 4026 4027 case AttributeList::AT_ns_returns_retained: 4028 if (!state.getSema().getLangOpts().ObjCAutoRefCount) 4029 break; 4030 // fallthrough into the function attrs 4031 4032 FUNCTION_TYPE_ATTRS_CASELIST: 4033 attr.setUsedAsTypeAttr(); 4034 4035 // Never process function type attributes as part of the 4036 // declaration-specifiers. 4037 if (isDeclSpec) 4038 distributeFunctionTypeAttrFromDeclSpec(state, attr, type); 4039 4040 // Otherwise, handle the possible delays. 4041 else if (!handleFunctionTypeAttr(state, attr, type)) 4042 distributeFunctionTypeAttr(state, attr, type); 4043 break; 4044 } 4045 } while ((attrs = next)); 4046} 4047 4048/// \brief Ensure that the type of the given expression is complete. 4049/// 4050/// This routine checks whether the expression \p E has a complete type. If the 4051/// expression refers to an instantiable construct, that instantiation is 4052/// performed as needed to complete its type. Furthermore 4053/// Sema::RequireCompleteType is called for the expression's type (or in the 4054/// case of a reference type, the referred-to type). 4055/// 4056/// \param E The expression whose type is required to be complete. 4057/// \param Diagnoser The object that will emit a diagnostic if the type is 4058/// incomplete. 4059/// 4060/// \returns \c true if the type of \p E is incomplete and diagnosed, \c false 4061/// otherwise. 4062bool Sema::RequireCompleteExprType(Expr *E, TypeDiagnoser &Diagnoser){ 4063 QualType T = E->getType(); 4064 4065 // Fast path the case where the type is already complete. 4066 if (!T->isIncompleteType()) 4067 return false; 4068 4069 // Incomplete array types may be completed by the initializer attached to 4070 // their definitions. For static data members of class templates we need to 4071 // instantiate the definition to get this initializer and complete the type. 4072 if (T->isIncompleteArrayType()) { 4073 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E->IgnoreParens())) { 4074 if (VarDecl *Var = dyn_cast<VarDecl>(DRE->getDecl())) { 4075 if (Var->isStaticDataMember() && 4076 Var->getInstantiatedFromStaticDataMember()) { 4077 4078 MemberSpecializationInfo *MSInfo = Var->getMemberSpecializationInfo(); 4079 assert(MSInfo && "Missing member specialization information?"); 4080 if (MSInfo->getTemplateSpecializationKind() 4081 != TSK_ExplicitSpecialization) { 4082 // If we don't already have a point of instantiation, this is it. 4083 if (MSInfo->getPointOfInstantiation().isInvalid()) { 4084 MSInfo->setPointOfInstantiation(E->getLocStart()); 4085 4086 // This is a modification of an existing AST node. Notify 4087 // listeners. 4088 if (ASTMutationListener *L = getASTMutationListener()) 4089 L->StaticDataMemberInstantiated(Var); 4090 } 4091 4092 InstantiateStaticDataMemberDefinition(E->getExprLoc(), Var); 4093 4094 // Update the type to the newly instantiated definition's type both 4095 // here and within the expression. 4096 if (VarDecl *Def = Var->getDefinition()) { 4097 DRE->setDecl(Def); 4098 T = Def->getType(); 4099 DRE->setType(T); 4100 E->setType(T); 4101 } 4102 } 4103 4104 // We still go on to try to complete the type independently, as it 4105 // may also require instantiations or diagnostics if it remains 4106 // incomplete. 4107 } 4108 } 4109 } 4110 } 4111 4112 // FIXME: Are there other cases which require instantiating something other 4113 // than the type to complete the type of an expression? 4114 4115 // Look through reference types and complete the referred type. 4116 if (const ReferenceType *Ref = T->getAs<ReferenceType>()) 4117 T = Ref->getPointeeType(); 4118 4119 return RequireCompleteType(E->getExprLoc(), T, Diagnoser); 4120} 4121 4122namespace { 4123 struct TypeDiagnoserDiag : Sema::TypeDiagnoser { 4124 unsigned DiagID; 4125 4126 TypeDiagnoserDiag(unsigned DiagID) 4127 : Sema::TypeDiagnoser(DiagID == 0), DiagID(DiagID) {} 4128 4129 virtual void diagnose(Sema &S, SourceLocation Loc, QualType T) { 4130 if (Suppressed) return; 4131 S.Diag(Loc, DiagID) << T; 4132 } 4133 }; 4134} 4135 4136bool Sema::RequireCompleteExprType(Expr *E, unsigned DiagID) { 4137 TypeDiagnoserDiag Diagnoser(DiagID); 4138 return RequireCompleteExprType(E, Diagnoser); 4139} 4140 4141/// @brief Ensure that the type T is a complete type. 4142/// 4143/// This routine checks whether the type @p T is complete in any 4144/// context where a complete type is required. If @p T is a complete 4145/// type, returns false. If @p T is a class template specialization, 4146/// this routine then attempts to perform class template 4147/// instantiation. If instantiation fails, or if @p T is incomplete 4148/// and cannot be completed, issues the diagnostic @p diag (giving it 4149/// the type @p T) and returns true. 4150/// 4151/// @param Loc The location in the source that the incomplete type 4152/// diagnostic should refer to. 4153/// 4154/// @param T The type that this routine is examining for completeness. 4155/// 4156/// @param PD The partial diagnostic that will be printed out if T is not a 4157/// complete type. 4158/// 4159/// @returns @c true if @p T is incomplete and a diagnostic was emitted, 4160/// @c false otherwise. 4161bool Sema::RequireCompleteType(SourceLocation Loc, QualType T, 4162 TypeDiagnoser &Diagnoser) { 4163 // FIXME: Add this assertion to make sure we always get instantiation points. 4164 // assert(!Loc.isInvalid() && "Invalid location in RequireCompleteType"); 4165 // FIXME: Add this assertion to help us flush out problems with 4166 // checking for dependent types and type-dependent expressions. 4167 // 4168 // assert(!T->isDependentType() && 4169 // "Can't ask whether a dependent type is complete"); 4170 4171 // If we have a complete type, we're done. 4172 NamedDecl *Def = 0; 4173 if (!T->isIncompleteType(&Def)) { 4174 // If we know about the definition but it is not visible, complain. 4175 if (!Diagnoser.Suppressed && Def && !LookupResult::isVisible(Def)) { 4176 // Suppress this error outside of a SFINAE context if we've already 4177 // emitted the error once for this type. There's no usefulness in 4178 // repeating the diagnostic. 4179 // FIXME: Add a Fix-It that imports the corresponding module or includes 4180 // the header. 4181 if (isSFINAEContext() || HiddenDefinitions.insert(Def)) { 4182 Diag(Loc, diag::err_module_private_definition) << T; 4183 Diag(Def->getLocation(), diag::note_previous_definition); 4184 } 4185 } 4186 4187 return false; 4188 } 4189 4190 const TagType *Tag = T->getAs<TagType>(); 4191 const ObjCInterfaceType *IFace = 0; 4192 4193 if (Tag) { 4194 // Avoid diagnosing invalid decls as incomplete. 4195 if (Tag->getDecl()->isInvalidDecl()) 4196 return true; 4197 4198 // Give the external AST source a chance to complete the type. 4199 if (Tag->getDecl()->hasExternalLexicalStorage()) { 4200 Context.getExternalSource()->CompleteType(Tag->getDecl()); 4201 if (!Tag->isIncompleteType()) 4202 return false; 4203 } 4204 } 4205 else if ((IFace = T->getAs<ObjCInterfaceType>())) { 4206 // Avoid diagnosing invalid decls as incomplete. 4207 if (IFace->getDecl()->isInvalidDecl()) 4208 return true; 4209 4210 // Give the external AST source a chance to complete the type. 4211 if (IFace->getDecl()->hasExternalLexicalStorage()) { 4212 Context.getExternalSource()->CompleteType(IFace->getDecl()); 4213 if (!IFace->isIncompleteType()) 4214 return false; 4215 } 4216 } 4217 4218 // If we have a class template specialization or a class member of a 4219 // class template specialization, or an array with known size of such, 4220 // try to instantiate it. 4221 QualType MaybeTemplate = T; 4222 while (const ConstantArrayType *Array 4223 = Context.getAsConstantArrayType(MaybeTemplate)) 4224 MaybeTemplate = Array->getElementType(); 4225 if (const RecordType *Record = MaybeTemplate->getAs<RecordType>()) { 4226 if (ClassTemplateSpecializationDecl *ClassTemplateSpec 4227 = dyn_cast<ClassTemplateSpecializationDecl>(Record->getDecl())) { 4228 if (ClassTemplateSpec->getSpecializationKind() == TSK_Undeclared) 4229 return InstantiateClassTemplateSpecialization(Loc, ClassTemplateSpec, 4230 TSK_ImplicitInstantiation, 4231 /*Complain=*/!Diagnoser.Suppressed); 4232 } else if (CXXRecordDecl *Rec 4233 = dyn_cast<CXXRecordDecl>(Record->getDecl())) { 4234 CXXRecordDecl *Pattern = Rec->getInstantiatedFromMemberClass(); 4235 if (!Rec->isBeingDefined() && Pattern) { 4236 MemberSpecializationInfo *MSI = Rec->getMemberSpecializationInfo(); 4237 assert(MSI && "Missing member specialization information?"); 4238 // This record was instantiated from a class within a template. 4239 if (MSI->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 4240 return InstantiateClass(Loc, Rec, Pattern, 4241 getTemplateInstantiationArgs(Rec), 4242 TSK_ImplicitInstantiation, 4243 /*Complain=*/!Diagnoser.Suppressed); 4244 } 4245 } 4246 } 4247 4248 if (Diagnoser.Suppressed) 4249 return true; 4250 4251 // We have an incomplete type. Produce a diagnostic. 4252 Diagnoser.diagnose(*this, Loc, T); 4253 4254 // If the type was a forward declaration of a class/struct/union 4255 // type, produce a note. 4256 if (Tag && !Tag->getDecl()->isInvalidDecl()) 4257 Diag(Tag->getDecl()->getLocation(), 4258 Tag->isBeingDefined() ? diag::note_type_being_defined 4259 : diag::note_forward_declaration) 4260 << QualType(Tag, 0); 4261 4262 // If the Objective-C class was a forward declaration, produce a note. 4263 if (IFace && !IFace->getDecl()->isInvalidDecl()) 4264 Diag(IFace->getDecl()->getLocation(), diag::note_forward_class); 4265 4266 return true; 4267} 4268 4269bool Sema::RequireCompleteType(SourceLocation Loc, QualType T, 4270 unsigned DiagID) { 4271 TypeDiagnoserDiag Diagnoser(DiagID); 4272 return RequireCompleteType(Loc, T, Diagnoser); 4273} 4274 4275/// @brief Ensure that the type T is a literal type. 4276/// 4277/// This routine checks whether the type @p T is a literal type. If @p T is an 4278/// incomplete type, an attempt is made to complete it. If @p T is a literal 4279/// type, or @p AllowIncompleteType is true and @p T is an incomplete type, 4280/// returns false. Otherwise, this routine issues the diagnostic @p PD (giving 4281/// it the type @p T), along with notes explaining why the type is not a 4282/// literal type, and returns true. 4283/// 4284/// @param Loc The location in the source that the non-literal type 4285/// diagnostic should refer to. 4286/// 4287/// @param T The type that this routine is examining for literalness. 4288/// 4289/// @param Diagnoser Emits a diagnostic if T is not a literal type. 4290/// 4291/// @returns @c true if @p T is not a literal type and a diagnostic was emitted, 4292/// @c false otherwise. 4293bool Sema::RequireLiteralType(SourceLocation Loc, QualType T, 4294 TypeDiagnoser &Diagnoser) { 4295 assert(!T->isDependentType() && "type should not be dependent"); 4296 4297 QualType ElemType = Context.getBaseElementType(T); 4298 RequireCompleteType(Loc, ElemType, 0); 4299 4300 if (T->isLiteralType()) 4301 return false; 4302 4303 if (Diagnoser.Suppressed) 4304 return true; 4305 4306 Diagnoser.diagnose(*this, Loc, T); 4307 4308 if (T->isVariableArrayType()) 4309 return true; 4310 4311 const RecordType *RT = ElemType->getAs<RecordType>(); 4312 if (!RT) 4313 return true; 4314 4315 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 4316 4317 // A partially-defined class type can't be a literal type, because a literal 4318 // class type must have a trivial destructor (which can't be checked until 4319 // the class definition is complete). 4320 if (!RD->isCompleteDefinition()) { 4321 RequireCompleteType(Loc, ElemType, diag::note_non_literal_incomplete, T); 4322 return true; 4323 } 4324 4325 // If the class has virtual base classes, then it's not an aggregate, and 4326 // cannot have any constexpr constructors or a trivial default constructor, 4327 // so is non-literal. This is better to diagnose than the resulting absence 4328 // of constexpr constructors. 4329 if (RD->getNumVBases()) { 4330 Diag(RD->getLocation(), diag::note_non_literal_virtual_base) 4331 << RD->isStruct() << RD->getNumVBases(); 4332 for (CXXRecordDecl::base_class_const_iterator I = RD->vbases_begin(), 4333 E = RD->vbases_end(); I != E; ++I) 4334 Diag(I->getLocStart(), 4335 diag::note_constexpr_virtual_base_here) << I->getSourceRange(); 4336 } else if (!RD->isAggregate() && !RD->hasConstexprNonCopyMoveConstructor() && 4337 !RD->hasTrivialDefaultConstructor()) { 4338 Diag(RD->getLocation(), diag::note_non_literal_no_constexpr_ctors) << RD; 4339 } else if (RD->hasNonLiteralTypeFieldsOrBases()) { 4340 for (CXXRecordDecl::base_class_const_iterator I = RD->bases_begin(), 4341 E = RD->bases_end(); I != E; ++I) { 4342 if (!I->getType()->isLiteralType()) { 4343 Diag(I->getLocStart(), 4344 diag::note_non_literal_base_class) 4345 << RD << I->getType() << I->getSourceRange(); 4346 return true; 4347 } 4348 } 4349 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 4350 E = RD->field_end(); I != E; ++I) { 4351 if (!I->getType()->isLiteralType() || 4352 I->getType().isVolatileQualified()) { 4353 Diag(I->getLocation(), diag::note_non_literal_field) 4354 << RD << &*I << I->getType() 4355 << I->getType().isVolatileQualified(); 4356 return true; 4357 } 4358 } 4359 } else if (!RD->hasTrivialDestructor()) { 4360 // All fields and bases are of literal types, so have trivial destructors. 4361 // If this class's destructor is non-trivial it must be user-declared. 4362 CXXDestructorDecl *Dtor = RD->getDestructor(); 4363 assert(Dtor && "class has literal fields and bases but no dtor?"); 4364 if (!Dtor) 4365 return true; 4366 4367 Diag(Dtor->getLocation(), Dtor->isUserProvided() ? 4368 diag::note_non_literal_user_provided_dtor : 4369 diag::note_non_literal_nontrivial_dtor) << RD; 4370 } 4371 4372 return true; 4373} 4374 4375bool Sema::RequireLiteralType(SourceLocation Loc, QualType T, unsigned DiagID) { 4376 TypeDiagnoserDiag Diagnoser(DiagID); 4377 return RequireLiteralType(Loc, T, Diagnoser); 4378} 4379 4380/// \brief Retrieve a version of the type 'T' that is elaborated by Keyword 4381/// and qualified by the nested-name-specifier contained in SS. 4382QualType Sema::getElaboratedType(ElaboratedTypeKeyword Keyword, 4383 const CXXScopeSpec &SS, QualType T) { 4384 if (T.isNull()) 4385 return T; 4386 NestedNameSpecifier *NNS; 4387 if (SS.isValid()) 4388 NNS = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 4389 else { 4390 if (Keyword == ETK_None) 4391 return T; 4392 NNS = 0; 4393 } 4394 return Context.getElaboratedType(Keyword, NNS, T); 4395} 4396 4397QualType Sema::BuildTypeofExprType(Expr *E, SourceLocation Loc) { 4398 ExprResult ER = CheckPlaceholderExpr(E); 4399 if (ER.isInvalid()) return QualType(); 4400 E = ER.take(); 4401 4402 if (!E->isTypeDependent()) { 4403 QualType T = E->getType(); 4404 if (const TagType *TT = T->getAs<TagType>()) 4405 DiagnoseUseOfDecl(TT->getDecl(), E->getExprLoc()); 4406 } 4407 return Context.getTypeOfExprType(E); 4408} 4409 4410/// getDecltypeForExpr - Given an expr, will return the decltype for 4411/// that expression, according to the rules in C++11 4412/// [dcl.type.simple]p4 and C++11 [expr.lambda.prim]p18. 4413static QualType getDecltypeForExpr(Sema &S, Expr *E) { 4414 if (E->isTypeDependent()) 4415 return S.Context.DependentTy; 4416 4417 // C++11 [dcl.type.simple]p4: 4418 // The type denoted by decltype(e) is defined as follows: 4419 // 4420 // - if e is an unparenthesized id-expression or an unparenthesized class 4421 // member access (5.2.5), decltype(e) is the type of the entity named 4422 // by e. If there is no such entity, or if e names a set of overloaded 4423 // functions, the program is ill-formed; 4424 if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E)) { 4425 if (const ValueDecl *VD = dyn_cast<ValueDecl>(DRE->getDecl())) 4426 return VD->getType(); 4427 } 4428 if (const MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 4429 if (const FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl())) 4430 return FD->getType(); 4431 } 4432 4433 // C++11 [expr.lambda.prim]p18: 4434 // Every occurrence of decltype((x)) where x is a possibly 4435 // parenthesized id-expression that names an entity of automatic 4436 // storage duration is treated as if x were transformed into an 4437 // access to a corresponding data member of the closure type that 4438 // would have been declared if x were an odr-use of the denoted 4439 // entity. 4440 using namespace sema; 4441 if (S.getCurLambda()) { 4442 if (isa<ParenExpr>(E)) { 4443 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E->IgnoreParens())) { 4444 if (VarDecl *Var = dyn_cast<VarDecl>(DRE->getDecl())) { 4445 QualType T = S.getCapturedDeclRefType(Var, DRE->getLocation()); 4446 if (!T.isNull()) 4447 return S.Context.getLValueReferenceType(T); 4448 } 4449 } 4450 } 4451 } 4452 4453 4454 // C++11 [dcl.type.simple]p4: 4455 // [...] 4456 QualType T = E->getType(); 4457 switch (E->getValueKind()) { 4458 // - otherwise, if e is an xvalue, decltype(e) is T&&, where T is the 4459 // type of e; 4460 case VK_XValue: T = S.Context.getRValueReferenceType(T); break; 4461 // - otherwise, if e is an lvalue, decltype(e) is T&, where T is the 4462 // type of e; 4463 case VK_LValue: T = S.Context.getLValueReferenceType(T); break; 4464 // - otherwise, decltype(e) is the type of e. 4465 case VK_RValue: break; 4466 } 4467 4468 return T; 4469} 4470 4471QualType Sema::BuildDecltypeType(Expr *E, SourceLocation Loc) { 4472 ExprResult ER = CheckPlaceholderExpr(E); 4473 if (ER.isInvalid()) return QualType(); 4474 E = ER.take(); 4475 4476 return Context.getDecltypeType(E, getDecltypeForExpr(*this, E)); 4477} 4478 4479QualType Sema::BuildUnaryTransformType(QualType BaseType, 4480 UnaryTransformType::UTTKind UKind, 4481 SourceLocation Loc) { 4482 switch (UKind) { 4483 case UnaryTransformType::EnumUnderlyingType: 4484 if (!BaseType->isDependentType() && !BaseType->isEnumeralType()) { 4485 Diag(Loc, diag::err_only_enums_have_underlying_types); 4486 return QualType(); 4487 } else { 4488 QualType Underlying = BaseType; 4489 if (!BaseType->isDependentType()) { 4490 EnumDecl *ED = BaseType->getAs<EnumType>()->getDecl(); 4491 assert(ED && "EnumType has no EnumDecl"); 4492 DiagnoseUseOfDecl(ED, Loc); 4493 Underlying = ED->getIntegerType(); 4494 } 4495 assert(!Underlying.isNull()); 4496 return Context.getUnaryTransformType(BaseType, Underlying, 4497 UnaryTransformType::EnumUnderlyingType); 4498 } 4499 } 4500 llvm_unreachable("unknown unary transform type"); 4501} 4502 4503QualType Sema::BuildAtomicType(QualType T, SourceLocation Loc) { 4504 if (!T->isDependentType()) { 4505 // FIXME: It isn't entirely clear whether incomplete atomic types 4506 // are allowed or not; for simplicity, ban them for the moment. 4507 if (RequireCompleteType(Loc, T, diag::err_atomic_specifier_bad_type, 0)) 4508 return QualType(); 4509 4510 int DisallowedKind = -1; 4511 if (T->isArrayType()) 4512 DisallowedKind = 1; 4513 else if (T->isFunctionType()) 4514 DisallowedKind = 2; 4515 else if (T->isReferenceType()) 4516 DisallowedKind = 3; 4517 else if (T->isAtomicType()) 4518 DisallowedKind = 4; 4519 else if (T.hasQualifiers()) 4520 DisallowedKind = 5; 4521 else if (!T.isTriviallyCopyableType(Context)) 4522 // Some other non-trivially-copyable type (probably a C++ class) 4523 DisallowedKind = 6; 4524 4525 if (DisallowedKind != -1) { 4526 Diag(Loc, diag::err_atomic_specifier_bad_type) << DisallowedKind << T; 4527 return QualType(); 4528 } 4529 4530 // FIXME: Do we need any handling for ARC here? 4531 } 4532 4533 // Build the pointer type. 4534 return Context.getAtomicType(T); 4535} 4536