SemaType.cpp revision 561d3abc881033776ece385a01a510e1cbc1fa92
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/SemaInternal.h" 15#include "clang/Sema/Template.h" 16#include "clang/Basic/OpenCL.h" 17#include "clang/AST/ASTContext.h" 18#include "clang/AST/ASTMutationListener.h" 19#include "clang/AST/CXXInheritance.h" 20#include "clang/AST/DeclObjC.h" 21#include "clang/AST/DeclTemplate.h" 22#include "clang/AST/TypeLoc.h" 23#include "clang/AST/TypeLocVisitor.h" 24#include "clang/AST/Expr.h" 25#include "clang/Basic/PartialDiagnostic.h" 26#include "clang/Basic/TargetInfo.h" 27#include "clang/Lex/Preprocessor.h" 28#include "clang/Sema/DeclSpec.h" 29#include "clang/Sema/DelayedDiagnostic.h" 30#include "clang/Sema/Lookup.h" 31#include "llvm/ADT/SmallPtrSet.h" 32#include "llvm/Support/ErrorHandling.h" 33using namespace clang; 34 35/// isOmittedBlockReturnType - Return true if this declarator is missing a 36/// return type because this is a omitted return type on a block literal. 37static bool isOmittedBlockReturnType(const Declarator &D) { 38 if (D.getContext() != Declarator::BlockLiteralContext || 39 D.getDeclSpec().hasTypeSpecifier()) 40 return false; 41 42 if (D.getNumTypeObjects() == 0) 43 return true; // ^{ ... } 44 45 if (D.getNumTypeObjects() == 1 && 46 D.getTypeObject(0).Kind == DeclaratorChunk::Function) 47 return true; // ^(int X, float Y) { ... } 48 49 return false; 50} 51 52/// diagnoseBadTypeAttribute - Diagnoses a type attribute which 53/// doesn't apply to the given type. 54static void diagnoseBadTypeAttribute(Sema &S, const AttributeList &attr, 55 QualType type) { 56 bool useExpansionLoc = false; 57 58 unsigned diagID = 0; 59 switch (attr.getKind()) { 60 case AttributeList::AT_objc_gc: 61 diagID = diag::warn_pointer_attribute_wrong_type; 62 useExpansionLoc = true; 63 break; 64 65 case AttributeList::AT_objc_ownership: 66 diagID = diag::warn_objc_object_attribute_wrong_type; 67 useExpansionLoc = true; 68 break; 69 70 default: 71 // Assume everything else was a function attribute. 72 diagID = diag::warn_function_attribute_wrong_type; 73 break; 74 } 75 76 SourceLocation loc = attr.getLoc(); 77 StringRef name = attr.getName()->getName(); 78 79 // The GC attributes are usually written with macros; special-case them. 80 if (useExpansionLoc && loc.isMacroID() && attr.getParameterName()) { 81 if (attr.getParameterName()->isStr("strong")) { 82 if (S.findMacroSpelling(loc, "__strong")) name = "__strong"; 83 } else if (attr.getParameterName()->isStr("weak")) { 84 if (S.findMacroSpelling(loc, "__weak")) name = "__weak"; 85 } 86 } 87 88 S.Diag(loc, diagID) << name << type; 89} 90 91// objc_gc applies to Objective-C pointers or, otherwise, to the 92// smallest available pointer type (i.e. 'void*' in 'void**'). 93#define OBJC_POINTER_TYPE_ATTRS_CASELIST \ 94 case AttributeList::AT_objc_gc: \ 95 case AttributeList::AT_objc_ownership 96 97// Function type attributes. 98#define FUNCTION_TYPE_ATTRS_CASELIST \ 99 case AttributeList::AT_noreturn: \ 100 case AttributeList::AT_cdecl: \ 101 case AttributeList::AT_fastcall: \ 102 case AttributeList::AT_stdcall: \ 103 case AttributeList::AT_thiscall: \ 104 case AttributeList::AT_pascal: \ 105 case AttributeList::AT_regparm: \ 106 case AttributeList::AT_pcs \ 107 108namespace { 109 /// An object which stores processing state for the entire 110 /// GetTypeForDeclarator process. 111 class TypeProcessingState { 112 Sema &sema; 113 114 /// The declarator being processed. 115 Declarator &declarator; 116 117 /// The index of the declarator chunk we're currently processing. 118 /// May be the total number of valid chunks, indicating the 119 /// DeclSpec. 120 unsigned chunkIndex; 121 122 /// Whether there are non-trivial modifications to the decl spec. 123 bool trivial; 124 125 /// Whether we saved the attributes in the decl spec. 126 bool hasSavedAttrs; 127 128 /// The original set of attributes on the DeclSpec. 129 SmallVector<AttributeList*, 2> savedAttrs; 130 131 /// A list of attributes to diagnose the uselessness of when the 132 /// processing is complete. 133 SmallVector<AttributeList*, 2> ignoredTypeAttrs; 134 135 public: 136 TypeProcessingState(Sema &sema, Declarator &declarator) 137 : sema(sema), declarator(declarator), 138 chunkIndex(declarator.getNumTypeObjects()), 139 trivial(true), hasSavedAttrs(false) {} 140 141 Sema &getSema() const { 142 return sema; 143 } 144 145 Declarator &getDeclarator() const { 146 return declarator; 147 } 148 149 unsigned getCurrentChunkIndex() const { 150 return chunkIndex; 151 } 152 153 void setCurrentChunkIndex(unsigned idx) { 154 assert(idx <= declarator.getNumTypeObjects()); 155 chunkIndex = idx; 156 } 157 158 AttributeList *&getCurrentAttrListRef() const { 159 assert(chunkIndex <= declarator.getNumTypeObjects()); 160 if (chunkIndex == declarator.getNumTypeObjects()) 161 return getMutableDeclSpec().getAttributes().getListRef(); 162 return declarator.getTypeObject(chunkIndex).getAttrListRef(); 163 } 164 165 /// Save the current set of attributes on the DeclSpec. 166 void saveDeclSpecAttrs() { 167 // Don't try to save them multiple times. 168 if (hasSavedAttrs) return; 169 170 DeclSpec &spec = getMutableDeclSpec(); 171 for (AttributeList *attr = spec.getAttributes().getList(); attr; 172 attr = attr->getNext()) 173 savedAttrs.push_back(attr); 174 trivial &= savedAttrs.empty(); 175 hasSavedAttrs = true; 176 } 177 178 /// Record that we had nowhere to put the given type attribute. 179 /// We will diagnose such attributes later. 180 void addIgnoredTypeAttr(AttributeList &attr) { 181 ignoredTypeAttrs.push_back(&attr); 182 } 183 184 /// Diagnose all the ignored type attributes, given that the 185 /// declarator worked out to the given type. 186 void diagnoseIgnoredTypeAttrs(QualType type) const { 187 for (SmallVectorImpl<AttributeList*>::const_iterator 188 i = ignoredTypeAttrs.begin(), e = ignoredTypeAttrs.end(); 189 i != e; ++i) 190 diagnoseBadTypeAttribute(getSema(), **i, type); 191 } 192 193 ~TypeProcessingState() { 194 if (trivial) return; 195 196 restoreDeclSpecAttrs(); 197 } 198 199 private: 200 DeclSpec &getMutableDeclSpec() const { 201 return const_cast<DeclSpec&>(declarator.getDeclSpec()); 202 } 203 204 void restoreDeclSpecAttrs() { 205 assert(hasSavedAttrs); 206 207 if (savedAttrs.empty()) { 208 getMutableDeclSpec().getAttributes().set(0); 209 return; 210 } 211 212 getMutableDeclSpec().getAttributes().set(savedAttrs[0]); 213 for (unsigned i = 0, e = savedAttrs.size() - 1; i != e; ++i) 214 savedAttrs[i]->setNext(savedAttrs[i+1]); 215 savedAttrs.back()->setNext(0); 216 } 217 }; 218 219 /// Basically std::pair except that we really want to avoid an 220 /// implicit operator= for safety concerns. It's also a minor 221 /// link-time optimization for this to be a private type. 222 struct AttrAndList { 223 /// The attribute. 224 AttributeList &first; 225 226 /// The head of the list the attribute is currently in. 227 AttributeList *&second; 228 229 AttrAndList(AttributeList &attr, AttributeList *&head) 230 : first(attr), second(head) {} 231 }; 232} 233 234namespace llvm { 235 template <> struct isPodLike<AttrAndList> { 236 static const bool value = true; 237 }; 238} 239 240static void spliceAttrIntoList(AttributeList &attr, AttributeList *&head) { 241 attr.setNext(head); 242 head = &attr; 243} 244 245static void spliceAttrOutOfList(AttributeList &attr, AttributeList *&head) { 246 if (head == &attr) { 247 head = attr.getNext(); 248 return; 249 } 250 251 AttributeList *cur = head; 252 while (true) { 253 assert(cur && cur->getNext() && "ran out of attrs?"); 254 if (cur->getNext() == &attr) { 255 cur->setNext(attr.getNext()); 256 return; 257 } 258 cur = cur->getNext(); 259 } 260} 261 262static void moveAttrFromListToList(AttributeList &attr, 263 AttributeList *&fromList, 264 AttributeList *&toList) { 265 spliceAttrOutOfList(attr, fromList); 266 spliceAttrIntoList(attr, toList); 267} 268 269static void processTypeAttrs(TypeProcessingState &state, 270 QualType &type, bool isDeclSpec, 271 AttributeList *attrs); 272 273static bool handleFunctionTypeAttr(TypeProcessingState &state, 274 AttributeList &attr, 275 QualType &type); 276 277static bool handleObjCGCTypeAttr(TypeProcessingState &state, 278 AttributeList &attr, QualType &type); 279 280static bool handleObjCOwnershipTypeAttr(TypeProcessingState &state, 281 AttributeList &attr, QualType &type); 282 283static bool handleObjCPointerTypeAttr(TypeProcessingState &state, 284 AttributeList &attr, QualType &type) { 285 if (attr.getKind() == AttributeList::AT_objc_gc) 286 return handleObjCGCTypeAttr(state, attr, type); 287 assert(attr.getKind() == AttributeList::AT_objc_ownership); 288 return handleObjCOwnershipTypeAttr(state, attr, type); 289} 290 291/// Given that an objc_gc attribute was written somewhere on a 292/// declaration *other* than on the declarator itself (for which, use 293/// distributeObjCPointerTypeAttrFromDeclarator), and given that it 294/// didn't apply in whatever position it was written in, try to move 295/// it to a more appropriate position. 296static void distributeObjCPointerTypeAttr(TypeProcessingState &state, 297 AttributeList &attr, 298 QualType type) { 299 Declarator &declarator = state.getDeclarator(); 300 for (unsigned i = state.getCurrentChunkIndex(); i != 0; --i) { 301 DeclaratorChunk &chunk = declarator.getTypeObject(i-1); 302 switch (chunk.Kind) { 303 case DeclaratorChunk::Pointer: 304 case DeclaratorChunk::BlockPointer: 305 moveAttrFromListToList(attr, state.getCurrentAttrListRef(), 306 chunk.getAttrListRef()); 307 return; 308 309 case DeclaratorChunk::Paren: 310 case DeclaratorChunk::Array: 311 continue; 312 313 // Don't walk through these. 314 case DeclaratorChunk::Reference: 315 case DeclaratorChunk::Function: 316 case DeclaratorChunk::MemberPointer: 317 goto error; 318 } 319 } 320 error: 321 322 diagnoseBadTypeAttribute(state.getSema(), attr, type); 323} 324 325/// Distribute an objc_gc type attribute that was written on the 326/// declarator. 327static void 328distributeObjCPointerTypeAttrFromDeclarator(TypeProcessingState &state, 329 AttributeList &attr, 330 QualType &declSpecType) { 331 Declarator &declarator = state.getDeclarator(); 332 333 // objc_gc goes on the innermost pointer to something that's not a 334 // pointer. 335 unsigned innermost = -1U; 336 bool considerDeclSpec = true; 337 for (unsigned i = 0, e = declarator.getNumTypeObjects(); i != e; ++i) { 338 DeclaratorChunk &chunk = declarator.getTypeObject(i); 339 switch (chunk.Kind) { 340 case DeclaratorChunk::Pointer: 341 case DeclaratorChunk::BlockPointer: 342 innermost = i; 343 continue; 344 345 case DeclaratorChunk::Reference: 346 case DeclaratorChunk::MemberPointer: 347 case DeclaratorChunk::Paren: 348 case DeclaratorChunk::Array: 349 continue; 350 351 case DeclaratorChunk::Function: 352 considerDeclSpec = false; 353 goto done; 354 } 355 } 356 done: 357 358 // That might actually be the decl spec if we weren't blocked by 359 // anything in the declarator. 360 if (considerDeclSpec) { 361 if (handleObjCPointerTypeAttr(state, attr, declSpecType)) { 362 // Splice the attribute into the decl spec. Prevents the 363 // attribute from being applied multiple times and gives 364 // the source-location-filler something to work with. 365 state.saveDeclSpecAttrs(); 366 moveAttrFromListToList(attr, declarator.getAttrListRef(), 367 declarator.getMutableDeclSpec().getAttributes().getListRef()); 368 return; 369 } 370 } 371 372 // Otherwise, if we found an appropriate chunk, splice the attribute 373 // into it. 374 if (innermost != -1U) { 375 moveAttrFromListToList(attr, declarator.getAttrListRef(), 376 declarator.getTypeObject(innermost).getAttrListRef()); 377 return; 378 } 379 380 // Otherwise, diagnose when we're done building the type. 381 spliceAttrOutOfList(attr, declarator.getAttrListRef()); 382 state.addIgnoredTypeAttr(attr); 383} 384 385/// A function type attribute was written somewhere in a declaration 386/// *other* than on the declarator itself or in the decl spec. Given 387/// that it didn't apply in whatever position it was written in, try 388/// to move it to a more appropriate position. 389static void distributeFunctionTypeAttr(TypeProcessingState &state, 390 AttributeList &attr, 391 QualType type) { 392 Declarator &declarator = state.getDeclarator(); 393 394 // Try to push the attribute from the return type of a function to 395 // the function itself. 396 for (unsigned i = state.getCurrentChunkIndex(); i != 0; --i) { 397 DeclaratorChunk &chunk = declarator.getTypeObject(i-1); 398 switch (chunk.Kind) { 399 case DeclaratorChunk::Function: 400 moveAttrFromListToList(attr, state.getCurrentAttrListRef(), 401 chunk.getAttrListRef()); 402 return; 403 404 case DeclaratorChunk::Paren: 405 case DeclaratorChunk::Pointer: 406 case DeclaratorChunk::BlockPointer: 407 case DeclaratorChunk::Array: 408 case DeclaratorChunk::Reference: 409 case DeclaratorChunk::MemberPointer: 410 continue; 411 } 412 } 413 414 diagnoseBadTypeAttribute(state.getSema(), attr, type); 415} 416 417/// Try to distribute a function type attribute to the innermost 418/// function chunk or type. Returns true if the attribute was 419/// distributed, false if no location was found. 420static bool 421distributeFunctionTypeAttrToInnermost(TypeProcessingState &state, 422 AttributeList &attr, 423 AttributeList *&attrList, 424 QualType &declSpecType) { 425 Declarator &declarator = state.getDeclarator(); 426 427 // Put it on the innermost function chunk, if there is one. 428 for (unsigned i = 0, e = declarator.getNumTypeObjects(); i != e; ++i) { 429 DeclaratorChunk &chunk = declarator.getTypeObject(i); 430 if (chunk.Kind != DeclaratorChunk::Function) continue; 431 432 moveAttrFromListToList(attr, attrList, chunk.getAttrListRef()); 433 return true; 434 } 435 436 if (handleFunctionTypeAttr(state, attr, declSpecType)) { 437 spliceAttrOutOfList(attr, attrList); 438 return true; 439 } 440 441 return false; 442} 443 444/// A function type attribute was written in the decl spec. Try to 445/// apply it somewhere. 446static void 447distributeFunctionTypeAttrFromDeclSpec(TypeProcessingState &state, 448 AttributeList &attr, 449 QualType &declSpecType) { 450 state.saveDeclSpecAttrs(); 451 452 // Try to distribute to the innermost. 453 if (distributeFunctionTypeAttrToInnermost(state, attr, 454 state.getCurrentAttrListRef(), 455 declSpecType)) 456 return; 457 458 // If that failed, diagnose the bad attribute when the declarator is 459 // fully built. 460 state.addIgnoredTypeAttr(attr); 461} 462 463/// A function type attribute was written on the declarator. Try to 464/// apply it somewhere. 465static void 466distributeFunctionTypeAttrFromDeclarator(TypeProcessingState &state, 467 AttributeList &attr, 468 QualType &declSpecType) { 469 Declarator &declarator = state.getDeclarator(); 470 471 // Try to distribute to the innermost. 472 if (distributeFunctionTypeAttrToInnermost(state, attr, 473 declarator.getAttrListRef(), 474 declSpecType)) 475 return; 476 477 // If that failed, diagnose the bad attribute when the declarator is 478 // fully built. 479 spliceAttrOutOfList(attr, declarator.getAttrListRef()); 480 state.addIgnoredTypeAttr(attr); 481} 482 483/// \brief Given that there are attributes written on the declarator 484/// itself, try to distribute any type attributes to the appropriate 485/// declarator chunk. 486/// 487/// These are attributes like the following: 488/// int f ATTR; 489/// int (f ATTR)(); 490/// but not necessarily this: 491/// int f() ATTR; 492static void distributeTypeAttrsFromDeclarator(TypeProcessingState &state, 493 QualType &declSpecType) { 494 // Collect all the type attributes from the declarator itself. 495 assert(state.getDeclarator().getAttributes() && "declarator has no attrs!"); 496 AttributeList *attr = state.getDeclarator().getAttributes(); 497 AttributeList *next; 498 do { 499 next = attr->getNext(); 500 501 switch (attr->getKind()) { 502 OBJC_POINTER_TYPE_ATTRS_CASELIST: 503 distributeObjCPointerTypeAttrFromDeclarator(state, *attr, declSpecType); 504 break; 505 506 case AttributeList::AT_ns_returns_retained: 507 if (!state.getSema().getLangOptions().ObjCAutoRefCount) 508 break; 509 // fallthrough 510 511 FUNCTION_TYPE_ATTRS_CASELIST: 512 distributeFunctionTypeAttrFromDeclarator(state, *attr, declSpecType); 513 break; 514 515 default: 516 break; 517 } 518 } while ((attr = next)); 519} 520 521/// Add a synthetic '()' to a block-literal declarator if it is 522/// required, given the return type. 523static void maybeSynthesizeBlockSignature(TypeProcessingState &state, 524 QualType declSpecType) { 525 Declarator &declarator = state.getDeclarator(); 526 527 // First, check whether the declarator would produce a function, 528 // i.e. whether the innermost semantic chunk is a function. 529 if (declarator.isFunctionDeclarator()) { 530 // If so, make that declarator a prototyped declarator. 531 declarator.getFunctionTypeInfo().hasPrototype = true; 532 return; 533 } 534 535 // If there are any type objects, the type as written won't name a 536 // function, regardless of the decl spec type. This is because a 537 // block signature declarator is always an abstract-declarator, and 538 // abstract-declarators can't just be parentheses chunks. Therefore 539 // we need to build a function chunk unless there are no type 540 // objects and the decl spec type is a function. 541 if (!declarator.getNumTypeObjects() && declSpecType->isFunctionType()) 542 return; 543 544 // Note that there *are* cases with invalid declarators where 545 // declarators consist solely of parentheses. In general, these 546 // occur only in failed efforts to make function declarators, so 547 // faking up the function chunk is still the right thing to do. 548 549 // Otherwise, we need to fake up a function declarator. 550 SourceLocation loc = declarator.getSourceRange().getBegin(); 551 552 // ...and *prepend* it to the declarator. 553 declarator.AddInnermostTypeInfo(DeclaratorChunk::getFunction( 554 /*proto*/ true, 555 /*variadic*/ false, SourceLocation(), 556 /*args*/ 0, 0, 557 /*type quals*/ 0, 558 /*ref-qualifier*/true, SourceLocation(), 559 /*const qualifier*/SourceLocation(), 560 /*volatile qualifier*/SourceLocation(), 561 /*mutable qualifier*/SourceLocation(), 562 /*EH*/ EST_None, SourceLocation(), 0, 0, 0, 0, 563 /*parens*/ loc, loc, 564 declarator)); 565 566 // For consistency, make sure the state still has us as processing 567 // the decl spec. 568 assert(state.getCurrentChunkIndex() == declarator.getNumTypeObjects() - 1); 569 state.setCurrentChunkIndex(declarator.getNumTypeObjects()); 570} 571 572/// \brief Convert the specified declspec to the appropriate type 573/// object. 574/// \param D the declarator containing the declaration specifier. 575/// \returns The type described by the declaration specifiers. This function 576/// never returns null. 577static QualType ConvertDeclSpecToType(TypeProcessingState &state) { 578 // FIXME: Should move the logic from DeclSpec::Finish to here for validity 579 // checking. 580 581 Sema &S = state.getSema(); 582 Declarator &declarator = state.getDeclarator(); 583 const DeclSpec &DS = declarator.getDeclSpec(); 584 SourceLocation DeclLoc = declarator.getIdentifierLoc(); 585 if (DeclLoc.isInvalid()) 586 DeclLoc = DS.getSourceRange().getBegin(); 587 588 ASTContext &Context = S.Context; 589 590 QualType Result; 591 switch (DS.getTypeSpecType()) { 592 case DeclSpec::TST_void: 593 Result = Context.VoidTy; 594 break; 595 case DeclSpec::TST_char: 596 if (DS.getTypeSpecSign() == DeclSpec::TSS_unspecified) 597 Result = Context.CharTy; 598 else if (DS.getTypeSpecSign() == DeclSpec::TSS_signed) 599 Result = Context.SignedCharTy; 600 else { 601 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unsigned && 602 "Unknown TSS value"); 603 Result = Context.UnsignedCharTy; 604 } 605 break; 606 case DeclSpec::TST_wchar: 607 if (DS.getTypeSpecSign() == DeclSpec::TSS_unspecified) 608 Result = Context.WCharTy; 609 else if (DS.getTypeSpecSign() == DeclSpec::TSS_signed) { 610 S.Diag(DS.getTypeSpecSignLoc(), diag::ext_invalid_sign_spec) 611 << DS.getSpecifierName(DS.getTypeSpecType()); 612 Result = Context.getSignedWCharType(); 613 } else { 614 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unsigned && 615 "Unknown TSS value"); 616 S.Diag(DS.getTypeSpecSignLoc(), diag::ext_invalid_sign_spec) 617 << DS.getSpecifierName(DS.getTypeSpecType()); 618 Result = Context.getUnsignedWCharType(); 619 } 620 break; 621 case DeclSpec::TST_char16: 622 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unspecified && 623 "Unknown TSS value"); 624 Result = Context.Char16Ty; 625 break; 626 case DeclSpec::TST_char32: 627 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unspecified && 628 "Unknown TSS value"); 629 Result = Context.Char32Ty; 630 break; 631 case DeclSpec::TST_unspecified: 632 // "<proto1,proto2>" is an objc qualified ID with a missing id. 633 if (DeclSpec::ProtocolQualifierListTy PQ = DS.getProtocolQualifiers()) { 634 Result = Context.getObjCObjectType(Context.ObjCBuiltinIdTy, 635 (ObjCProtocolDecl**)PQ, 636 DS.getNumProtocolQualifiers()); 637 Result = Context.getObjCObjectPointerType(Result); 638 break; 639 } 640 641 // If this is a missing declspec in a block literal return context, then it 642 // is inferred from the return statements inside the block. 643 // The declspec is always missing in a lambda expr context; it is either 644 // specified with a trailing return type or inferred. 645 if (declarator.getContext() == Declarator::LambdaExprContext || 646 isOmittedBlockReturnType(declarator)) { 647 Result = Context.DependentTy; 648 break; 649 } 650 651 // Unspecified typespec defaults to int in C90. However, the C90 grammar 652 // [C90 6.5] only allows a decl-spec if there was *some* type-specifier, 653 // type-qualifier, or storage-class-specifier. If not, emit an extwarn. 654 // Note that the one exception to this is function definitions, which are 655 // allowed to be completely missing a declspec. This is handled in the 656 // parser already though by it pretending to have seen an 'int' in this 657 // case. 658 if (S.getLangOptions().ImplicitInt) { 659 // In C89 mode, we only warn if there is a completely missing declspec 660 // when one is not allowed. 661 if (DS.isEmpty()) { 662 S.Diag(DeclLoc, diag::ext_missing_declspec) 663 << DS.getSourceRange() 664 << FixItHint::CreateInsertion(DS.getSourceRange().getBegin(), "int"); 665 } 666 } else if (!DS.hasTypeSpecifier()) { 667 // C99 and C++ require a type specifier. For example, C99 6.7.2p2 says: 668 // "At least one type specifier shall be given in the declaration 669 // specifiers in each declaration, and in the specifier-qualifier list in 670 // each struct declaration and type name." 671 // FIXME: Does Microsoft really have the implicit int extension in C++? 672 if (S.getLangOptions().CPlusPlus && 673 !S.getLangOptions().MicrosoftExt) { 674 S.Diag(DeclLoc, diag::err_missing_type_specifier) 675 << DS.getSourceRange(); 676 677 // When this occurs in C++ code, often something is very broken with the 678 // value being declared, poison it as invalid so we don't get chains of 679 // errors. 680 declarator.setInvalidType(true); 681 } else { 682 S.Diag(DeclLoc, diag::ext_missing_type_specifier) 683 << DS.getSourceRange(); 684 } 685 } 686 687 // FALL THROUGH. 688 case DeclSpec::TST_int: { 689 if (DS.getTypeSpecSign() != DeclSpec::TSS_unsigned) { 690 switch (DS.getTypeSpecWidth()) { 691 case DeclSpec::TSW_unspecified: Result = Context.IntTy; break; 692 case DeclSpec::TSW_short: Result = Context.ShortTy; break; 693 case DeclSpec::TSW_long: Result = Context.LongTy; break; 694 case DeclSpec::TSW_longlong: 695 Result = Context.LongLongTy; 696 697 // long long is a C99 feature. 698 if (!S.getLangOptions().C99) 699 S.Diag(DS.getTypeSpecWidthLoc(), 700 S.getLangOptions().CPlusPlus0x ? 701 diag::warn_cxx98_compat_longlong : diag::ext_longlong); 702 break; 703 } 704 } else { 705 switch (DS.getTypeSpecWidth()) { 706 case DeclSpec::TSW_unspecified: Result = Context.UnsignedIntTy; break; 707 case DeclSpec::TSW_short: Result = Context.UnsignedShortTy; break; 708 case DeclSpec::TSW_long: Result = Context.UnsignedLongTy; break; 709 case DeclSpec::TSW_longlong: 710 Result = Context.UnsignedLongLongTy; 711 712 // long long is a C99 feature. 713 if (!S.getLangOptions().C99) 714 S.Diag(DS.getTypeSpecWidthLoc(), 715 S.getLangOptions().CPlusPlus0x ? 716 diag::warn_cxx98_compat_longlong : diag::ext_longlong); 717 break; 718 } 719 } 720 break; 721 } 722 case DeclSpec::TST_half: Result = Context.HalfTy; break; 723 case DeclSpec::TST_float: Result = Context.FloatTy; break; 724 case DeclSpec::TST_double: 725 if (DS.getTypeSpecWidth() == DeclSpec::TSW_long) 726 Result = Context.LongDoubleTy; 727 else 728 Result = Context.DoubleTy; 729 730 if (S.getLangOptions().OpenCL && !S.getOpenCLOptions().cl_khr_fp64) { 731 S.Diag(DS.getTypeSpecTypeLoc(), diag::err_double_requires_fp64); 732 declarator.setInvalidType(true); 733 } 734 break; 735 case DeclSpec::TST_bool: Result = Context.BoolTy; break; // _Bool or bool 736 case DeclSpec::TST_decimal32: // _Decimal32 737 case DeclSpec::TST_decimal64: // _Decimal64 738 case DeclSpec::TST_decimal128: // _Decimal128 739 S.Diag(DS.getTypeSpecTypeLoc(), diag::err_decimal_unsupported); 740 Result = Context.IntTy; 741 declarator.setInvalidType(true); 742 break; 743 case DeclSpec::TST_class: 744 case DeclSpec::TST_enum: 745 case DeclSpec::TST_union: 746 case DeclSpec::TST_struct: { 747 TypeDecl *D = dyn_cast_or_null<TypeDecl>(DS.getRepAsDecl()); 748 if (!D) { 749 // This can happen in C++ with ambiguous lookups. 750 Result = Context.IntTy; 751 declarator.setInvalidType(true); 752 break; 753 } 754 755 // If the type is deprecated or unavailable, diagnose it. 756 S.DiagnoseUseOfDecl(D, DS.getTypeSpecTypeNameLoc()); 757 758 assert(DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 && 759 DS.getTypeSpecSign() == 0 && "No qualifiers on tag names!"); 760 761 // TypeQuals handled by caller. 762 Result = Context.getTypeDeclType(D); 763 764 // In both C and C++, make an ElaboratedType. 765 ElaboratedTypeKeyword Keyword 766 = ElaboratedType::getKeywordForTypeSpec(DS.getTypeSpecType()); 767 Result = S.getElaboratedType(Keyword, DS.getTypeSpecScope(), Result); 768 769 if (D->isInvalidDecl()) 770 declarator.setInvalidType(true); 771 break; 772 } 773 case DeclSpec::TST_typename: { 774 assert(DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 && 775 DS.getTypeSpecSign() == 0 && 776 "Can't handle qualifiers on typedef names yet!"); 777 Result = S.GetTypeFromParser(DS.getRepAsType()); 778 if (Result.isNull()) 779 declarator.setInvalidType(true); 780 else if (DeclSpec::ProtocolQualifierListTy PQ 781 = DS.getProtocolQualifiers()) { 782 if (const ObjCObjectType *ObjT = Result->getAs<ObjCObjectType>()) { 783 // Silently drop any existing protocol qualifiers. 784 // TODO: determine whether that's the right thing to do. 785 if (ObjT->getNumProtocols()) 786 Result = ObjT->getBaseType(); 787 788 if (DS.getNumProtocolQualifiers()) 789 Result = Context.getObjCObjectType(Result, 790 (ObjCProtocolDecl**) PQ, 791 DS.getNumProtocolQualifiers()); 792 } else if (Result->isObjCIdType()) { 793 // id<protocol-list> 794 Result = Context.getObjCObjectType(Context.ObjCBuiltinIdTy, 795 (ObjCProtocolDecl**) PQ, 796 DS.getNumProtocolQualifiers()); 797 Result = Context.getObjCObjectPointerType(Result); 798 } else if (Result->isObjCClassType()) { 799 // Class<protocol-list> 800 Result = Context.getObjCObjectType(Context.ObjCBuiltinClassTy, 801 (ObjCProtocolDecl**) PQ, 802 DS.getNumProtocolQualifiers()); 803 Result = Context.getObjCObjectPointerType(Result); 804 } else { 805 S.Diag(DeclLoc, diag::err_invalid_protocol_qualifiers) 806 << DS.getSourceRange(); 807 declarator.setInvalidType(true); 808 } 809 } 810 811 // TypeQuals handled by caller. 812 break; 813 } 814 case DeclSpec::TST_typeofType: 815 // FIXME: Preserve type source info. 816 Result = S.GetTypeFromParser(DS.getRepAsType()); 817 assert(!Result.isNull() && "Didn't get a type for typeof?"); 818 if (!Result->isDependentType()) 819 if (const TagType *TT = Result->getAs<TagType>()) 820 S.DiagnoseUseOfDecl(TT->getDecl(), DS.getTypeSpecTypeLoc()); 821 // TypeQuals handled by caller. 822 Result = Context.getTypeOfType(Result); 823 break; 824 case DeclSpec::TST_typeofExpr: { 825 Expr *E = DS.getRepAsExpr(); 826 assert(E && "Didn't get an expression for typeof?"); 827 // TypeQuals handled by caller. 828 Result = S.BuildTypeofExprType(E, DS.getTypeSpecTypeLoc()); 829 if (Result.isNull()) { 830 Result = Context.IntTy; 831 declarator.setInvalidType(true); 832 } 833 break; 834 } 835 case DeclSpec::TST_decltype: { 836 Expr *E = DS.getRepAsExpr(); 837 assert(E && "Didn't get an expression for decltype?"); 838 // TypeQuals handled by caller. 839 Result = S.BuildDecltypeType(E, DS.getTypeSpecTypeLoc()); 840 if (Result.isNull()) { 841 Result = Context.IntTy; 842 declarator.setInvalidType(true); 843 } 844 break; 845 } 846 case DeclSpec::TST_underlyingType: 847 Result = S.GetTypeFromParser(DS.getRepAsType()); 848 assert(!Result.isNull() && "Didn't get a type for __underlying_type?"); 849 Result = S.BuildUnaryTransformType(Result, 850 UnaryTransformType::EnumUnderlyingType, 851 DS.getTypeSpecTypeLoc()); 852 if (Result.isNull()) { 853 Result = Context.IntTy; 854 declarator.setInvalidType(true); 855 } 856 break; 857 858 case DeclSpec::TST_auto: { 859 // TypeQuals handled by caller. 860 Result = Context.getAutoType(QualType()); 861 break; 862 } 863 864 case DeclSpec::TST_unknown_anytype: 865 Result = Context.UnknownAnyTy; 866 break; 867 868 case DeclSpec::TST_atomic: 869 Result = S.GetTypeFromParser(DS.getRepAsType()); 870 assert(!Result.isNull() && "Didn't get a type for _Atomic?"); 871 Result = S.BuildAtomicType(Result, DS.getTypeSpecTypeLoc()); 872 if (Result.isNull()) { 873 Result = Context.IntTy; 874 declarator.setInvalidType(true); 875 } 876 break; 877 878 case DeclSpec::TST_error: 879 Result = Context.IntTy; 880 declarator.setInvalidType(true); 881 break; 882 } 883 884 // Handle complex types. 885 if (DS.getTypeSpecComplex() == DeclSpec::TSC_complex) { 886 if (S.getLangOptions().Freestanding) 887 S.Diag(DS.getTypeSpecComplexLoc(), diag::ext_freestanding_complex); 888 Result = Context.getComplexType(Result); 889 } else if (DS.isTypeAltiVecVector()) { 890 unsigned typeSize = static_cast<unsigned>(Context.getTypeSize(Result)); 891 assert(typeSize > 0 && "type size for vector must be greater than 0 bits"); 892 VectorType::VectorKind VecKind = VectorType::AltiVecVector; 893 if (DS.isTypeAltiVecPixel()) 894 VecKind = VectorType::AltiVecPixel; 895 else if (DS.isTypeAltiVecBool()) 896 VecKind = VectorType::AltiVecBool; 897 Result = Context.getVectorType(Result, 128/typeSize, VecKind); 898 } 899 900 // FIXME: Imaginary. 901 if (DS.getTypeSpecComplex() == DeclSpec::TSC_imaginary) 902 S.Diag(DS.getTypeSpecComplexLoc(), diag::err_imaginary_not_supported); 903 904 // Before we process any type attributes, synthesize a block literal 905 // function declarator if necessary. 906 if (declarator.getContext() == Declarator::BlockLiteralContext) 907 maybeSynthesizeBlockSignature(state, Result); 908 909 // Apply any type attributes from the decl spec. This may cause the 910 // list of type attributes to be temporarily saved while the type 911 // attributes are pushed around. 912 if (AttributeList *attrs = DS.getAttributes().getList()) 913 processTypeAttrs(state, Result, true, attrs); 914 915 // Apply const/volatile/restrict qualifiers to T. 916 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 917 918 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 919 // or incomplete types shall not be restrict-qualified." C++ also allows 920 // restrict-qualified references. 921 if (TypeQuals & DeclSpec::TQ_restrict) { 922 if (Result->isAnyPointerType() || Result->isReferenceType()) { 923 QualType EltTy; 924 if (Result->isObjCObjectPointerType()) 925 EltTy = Result; 926 else 927 EltTy = Result->isPointerType() ? 928 Result->getAs<PointerType>()->getPointeeType() : 929 Result->getAs<ReferenceType>()->getPointeeType(); 930 931 // If we have a pointer or reference, the pointee must have an object 932 // incomplete type. 933 if (!EltTy->isIncompleteOrObjectType()) { 934 S.Diag(DS.getRestrictSpecLoc(), 935 diag::err_typecheck_invalid_restrict_invalid_pointee) 936 << EltTy << DS.getSourceRange(); 937 TypeQuals &= ~DeclSpec::TQ_restrict; // Remove the restrict qualifier. 938 } 939 } else { 940 S.Diag(DS.getRestrictSpecLoc(), 941 diag::err_typecheck_invalid_restrict_not_pointer) 942 << Result << DS.getSourceRange(); 943 TypeQuals &= ~DeclSpec::TQ_restrict; // Remove the restrict qualifier. 944 } 945 } 946 947 // Warn about CV qualifiers on functions: C99 6.7.3p8: "If the specification 948 // of a function type includes any type qualifiers, the behavior is 949 // undefined." 950 if (Result->isFunctionType() && TypeQuals) { 951 // Get some location to point at, either the C or V location. 952 SourceLocation Loc; 953 if (TypeQuals & DeclSpec::TQ_const) 954 Loc = DS.getConstSpecLoc(); 955 else if (TypeQuals & DeclSpec::TQ_volatile) 956 Loc = DS.getVolatileSpecLoc(); 957 else { 958 assert((TypeQuals & DeclSpec::TQ_restrict) && 959 "Has CVR quals but not C, V, or R?"); 960 Loc = DS.getRestrictSpecLoc(); 961 } 962 S.Diag(Loc, diag::warn_typecheck_function_qualifiers) 963 << Result << DS.getSourceRange(); 964 } 965 966 // C++ [dcl.ref]p1: 967 // Cv-qualified references are ill-formed except when the 968 // cv-qualifiers are introduced through the use of a typedef 969 // (7.1.3) or of a template type argument (14.3), in which 970 // case the cv-qualifiers are ignored. 971 // FIXME: Shouldn't we be checking SCS_typedef here? 972 if (DS.getTypeSpecType() == DeclSpec::TST_typename && 973 TypeQuals && Result->isReferenceType()) { 974 TypeQuals &= ~DeclSpec::TQ_const; 975 TypeQuals &= ~DeclSpec::TQ_volatile; 976 } 977 978 Qualifiers Quals = Qualifiers::fromCVRMask(TypeQuals); 979 Result = Context.getQualifiedType(Result, Quals); 980 } 981 982 return Result; 983} 984 985static std::string getPrintableNameForEntity(DeclarationName Entity) { 986 if (Entity) 987 return Entity.getAsString(); 988 989 return "type name"; 990} 991 992QualType Sema::BuildQualifiedType(QualType T, SourceLocation Loc, 993 Qualifiers Qs) { 994 // Enforce C99 6.7.3p2: "Types other than pointer types derived from 995 // object or incomplete types shall not be restrict-qualified." 996 if (Qs.hasRestrict()) { 997 unsigned DiagID = 0; 998 QualType ProblemTy; 999 1000 const Type *Ty = T->getCanonicalTypeInternal().getTypePtr(); 1001 if (const ReferenceType *RTy = dyn_cast<ReferenceType>(Ty)) { 1002 if (!RTy->getPointeeType()->isIncompleteOrObjectType()) { 1003 DiagID = diag::err_typecheck_invalid_restrict_invalid_pointee; 1004 ProblemTy = T->getAs<ReferenceType>()->getPointeeType(); 1005 } 1006 } else if (const PointerType *PTy = dyn_cast<PointerType>(Ty)) { 1007 if (!PTy->getPointeeType()->isIncompleteOrObjectType()) { 1008 DiagID = diag::err_typecheck_invalid_restrict_invalid_pointee; 1009 ProblemTy = T->getAs<PointerType>()->getPointeeType(); 1010 } 1011 } else if (const MemberPointerType *PTy = dyn_cast<MemberPointerType>(Ty)) { 1012 if (!PTy->getPointeeType()->isIncompleteOrObjectType()) { 1013 DiagID = diag::err_typecheck_invalid_restrict_invalid_pointee; 1014 ProblemTy = T->getAs<PointerType>()->getPointeeType(); 1015 } 1016 } else if (!Ty->isDependentType()) { 1017 // FIXME: this deserves a proper diagnostic 1018 DiagID = diag::err_typecheck_invalid_restrict_invalid_pointee; 1019 ProblemTy = T; 1020 } 1021 1022 if (DiagID) { 1023 Diag(Loc, DiagID) << ProblemTy; 1024 Qs.removeRestrict(); 1025 } 1026 } 1027 1028 return Context.getQualifiedType(T, Qs); 1029} 1030 1031/// \brief Build a paren type including \p T. 1032QualType Sema::BuildParenType(QualType T) { 1033 return Context.getParenType(T); 1034} 1035 1036/// Given that we're building a pointer or reference to the given 1037static QualType inferARCLifetimeForPointee(Sema &S, QualType type, 1038 SourceLocation loc, 1039 bool isReference) { 1040 // Bail out if retention is unrequired or already specified. 1041 if (!type->isObjCLifetimeType() || 1042 type.getObjCLifetime() != Qualifiers::OCL_None) 1043 return type; 1044 1045 Qualifiers::ObjCLifetime implicitLifetime = Qualifiers::OCL_None; 1046 1047 // If the object type is const-qualified, we can safely use 1048 // __unsafe_unretained. This is safe (because there are no read 1049 // barriers), and it'll be safe to coerce anything but __weak* to 1050 // the resulting type. 1051 if (type.isConstQualified()) { 1052 implicitLifetime = Qualifiers::OCL_ExplicitNone; 1053 1054 // Otherwise, check whether the static type does not require 1055 // retaining. This currently only triggers for Class (possibly 1056 // protocol-qualifed, and arrays thereof). 1057 } else if (type->isObjCARCImplicitlyUnretainedType()) { 1058 implicitLifetime = Qualifiers::OCL_ExplicitNone; 1059 1060 // If we are in an unevaluated context, like sizeof, assume ExplicitNone and 1061 // don't give error. 1062 } else if (S.ExprEvalContexts.back().Context == Sema::Unevaluated || 1063 S.ExprEvalContexts.back().Context == Sema::ConstantEvaluated) { 1064 implicitLifetime = Qualifiers::OCL_ExplicitNone; 1065 1066 // If that failed, give an error and recover using __autoreleasing. 1067 } else { 1068 // These types can show up in private ivars in system headers, so 1069 // we need this to not be an error in those cases. Instead we 1070 // want to delay. 1071 if (S.DelayedDiagnostics.shouldDelayDiagnostics()) { 1072 S.DelayedDiagnostics.add( 1073 sema::DelayedDiagnostic::makeForbiddenType(loc, 1074 diag::err_arc_indirect_no_ownership, type, isReference)); 1075 } else { 1076 S.Diag(loc, diag::err_arc_indirect_no_ownership) << type << isReference; 1077 } 1078 implicitLifetime = Qualifiers::OCL_Autoreleasing; 1079 } 1080 assert(implicitLifetime && "didn't infer any lifetime!"); 1081 1082 Qualifiers qs; 1083 qs.addObjCLifetime(implicitLifetime); 1084 return S.Context.getQualifiedType(type, qs); 1085} 1086 1087/// \brief Build a pointer type. 1088/// 1089/// \param T The type to which we'll be building a pointer. 1090/// 1091/// \param Loc The location of the entity whose type involves this 1092/// pointer type or, if there is no such entity, the location of the 1093/// type that will have pointer type. 1094/// 1095/// \param Entity The name of the entity that involves the pointer 1096/// type, if known. 1097/// 1098/// \returns A suitable pointer type, if there are no 1099/// errors. Otherwise, returns a NULL type. 1100QualType Sema::BuildPointerType(QualType T, 1101 SourceLocation Loc, DeclarationName Entity) { 1102 if (T->isReferenceType()) { 1103 // C++ 8.3.2p4: There shall be no ... pointers to references ... 1104 Diag(Loc, diag::err_illegal_decl_pointer_to_reference) 1105 << getPrintableNameForEntity(Entity) << T; 1106 return QualType(); 1107 } 1108 1109 assert(!T->isObjCObjectType() && "Should build ObjCObjectPointerType"); 1110 1111 // In ARC, it is forbidden to build pointers to unqualified pointers. 1112 if (getLangOptions().ObjCAutoRefCount) 1113 T = inferARCLifetimeForPointee(*this, T, Loc, /*reference*/ false); 1114 1115 // Build the pointer type. 1116 return Context.getPointerType(T); 1117} 1118 1119/// \brief Build a reference type. 1120/// 1121/// \param T The type to which we'll be building a reference. 1122/// 1123/// \param Loc The location of the entity whose type involves this 1124/// reference type or, if there is no such entity, the location of the 1125/// type that will have reference type. 1126/// 1127/// \param Entity The name of the entity that involves the reference 1128/// type, if known. 1129/// 1130/// \returns A suitable reference type, if there are no 1131/// errors. Otherwise, returns a NULL type. 1132QualType Sema::BuildReferenceType(QualType T, bool SpelledAsLValue, 1133 SourceLocation Loc, 1134 DeclarationName Entity) { 1135 assert(Context.getCanonicalType(T) != Context.OverloadTy && 1136 "Unresolved overloaded function type"); 1137 1138 // C++0x [dcl.ref]p6: 1139 // If a typedef (7.1.3), a type template-parameter (14.3.1), or a 1140 // decltype-specifier (7.1.6.2) denotes a type TR that is a reference to a 1141 // type T, an attempt to create the type "lvalue reference to cv TR" creates 1142 // the type "lvalue reference to T", while an attempt to create the type 1143 // "rvalue reference to cv TR" creates the type TR. 1144 bool LValueRef = SpelledAsLValue || T->getAs<LValueReferenceType>(); 1145 1146 // C++ [dcl.ref]p4: There shall be no references to references. 1147 // 1148 // According to C++ DR 106, references to references are only 1149 // diagnosed when they are written directly (e.g., "int & &"), 1150 // but not when they happen via a typedef: 1151 // 1152 // typedef int& intref; 1153 // typedef intref& intref2; 1154 // 1155 // Parser::ParseDeclaratorInternal diagnoses the case where 1156 // references are written directly; here, we handle the 1157 // collapsing of references-to-references as described in C++0x. 1158 // DR 106 and 540 introduce reference-collapsing into C++98/03. 1159 1160 // C++ [dcl.ref]p1: 1161 // A declarator that specifies the type "reference to cv void" 1162 // is ill-formed. 1163 if (T->isVoidType()) { 1164 Diag(Loc, diag::err_reference_to_void); 1165 return QualType(); 1166 } 1167 1168 // In ARC, it is forbidden to build references to unqualified pointers. 1169 if (getLangOptions().ObjCAutoRefCount) 1170 T = inferARCLifetimeForPointee(*this, T, Loc, /*reference*/ true); 1171 1172 // Handle restrict on references. 1173 if (LValueRef) 1174 return Context.getLValueReferenceType(T, SpelledAsLValue); 1175 return Context.getRValueReferenceType(T); 1176} 1177 1178/// Check whether the specified array size makes the array type a VLA. If so, 1179/// return true, if not, return the size of the array in SizeVal. 1180static bool isArraySizeVLA(Expr *ArraySize, llvm::APSInt &SizeVal, Sema &S) { 1181 // If the size is an ICE, it certainly isn't a VLA. 1182 if (ArraySize->isIntegerConstantExpr(SizeVal, S.Context)) 1183 return false; 1184 1185 // If we're in a GNU mode (like gnu99, but not c99) accept any evaluatable 1186 // value as an extension. 1187 if (S.LangOpts.GNUMode && ArraySize->EvaluateAsInt(SizeVal, S.Context)) { 1188 S.Diag(ArraySize->getLocStart(), diag::ext_vla_folded_to_constant); 1189 return false; 1190 } 1191 1192 return true; 1193} 1194 1195 1196/// \brief Build an array type. 1197/// 1198/// \param T The type of each element in the array. 1199/// 1200/// \param ASM C99 array size modifier (e.g., '*', 'static'). 1201/// 1202/// \param ArraySize Expression describing the size of the array. 1203/// 1204/// \param Loc The location of the entity whose type involves this 1205/// array type or, if there is no such entity, the location of the 1206/// type that will have array type. 1207/// 1208/// \param Entity The name of the entity that involves the array 1209/// type, if known. 1210/// 1211/// \returns A suitable array type, if there are no errors. Otherwise, 1212/// returns a NULL type. 1213QualType Sema::BuildArrayType(QualType T, ArrayType::ArraySizeModifier ASM, 1214 Expr *ArraySize, unsigned Quals, 1215 SourceRange Brackets, DeclarationName Entity) { 1216 1217 SourceLocation Loc = Brackets.getBegin(); 1218 if (getLangOptions().CPlusPlus) { 1219 // C++ [dcl.array]p1: 1220 // T is called the array element type; this type shall not be a reference 1221 // type, the (possibly cv-qualified) type void, a function type or an 1222 // abstract class type. 1223 // 1224 // Note: function types are handled in the common path with C. 1225 if (T->isReferenceType()) { 1226 Diag(Loc, diag::err_illegal_decl_array_of_references) 1227 << getPrintableNameForEntity(Entity) << T; 1228 return QualType(); 1229 } 1230 1231 if (T->isVoidType()) { 1232 Diag(Loc, diag::err_illegal_decl_array_incomplete_type) << T; 1233 return QualType(); 1234 } 1235 1236 if (RequireNonAbstractType(Brackets.getBegin(), T, 1237 diag::err_array_of_abstract_type)) 1238 return QualType(); 1239 1240 } else { 1241 // C99 6.7.5.2p1: If the element type is an incomplete or function type, 1242 // reject it (e.g. void ary[7], struct foo ary[7], void ary[7]()) 1243 if (RequireCompleteType(Loc, T, 1244 diag::err_illegal_decl_array_incomplete_type)) 1245 return QualType(); 1246 } 1247 1248 if (T->isFunctionType()) { 1249 Diag(Loc, diag::err_illegal_decl_array_of_functions) 1250 << getPrintableNameForEntity(Entity) << T; 1251 return QualType(); 1252 } 1253 1254 if (T->getContainedAutoType()) { 1255 Diag(Loc, diag::err_illegal_decl_array_of_auto) 1256 << getPrintableNameForEntity(Entity) << T; 1257 return QualType(); 1258 } 1259 1260 if (const RecordType *EltTy = T->getAs<RecordType>()) { 1261 // If the element type is a struct or union that contains a variadic 1262 // array, accept it as a GNU extension: C99 6.7.2.1p2. 1263 if (EltTy->getDecl()->hasFlexibleArrayMember()) 1264 Diag(Loc, diag::ext_flexible_array_in_array) << T; 1265 } else if (T->isObjCObjectType()) { 1266 Diag(Loc, diag::err_objc_array_of_interfaces) << T; 1267 return QualType(); 1268 } 1269 1270 // Do placeholder conversions on the array size expression. 1271 if (ArraySize && ArraySize->hasPlaceholderType()) { 1272 ExprResult Result = CheckPlaceholderExpr(ArraySize); 1273 if (Result.isInvalid()) return QualType(); 1274 ArraySize = Result.take(); 1275 } 1276 1277 // Do lvalue-to-rvalue conversions on the array size expression. 1278 if (ArraySize && !ArraySize->isRValue()) { 1279 ExprResult Result = DefaultLvalueConversion(ArraySize); 1280 if (Result.isInvalid()) 1281 return QualType(); 1282 1283 ArraySize = Result.take(); 1284 } 1285 1286 // C99 6.7.5.2p1: The size expression shall have integer type. 1287 // TODO: in theory, if we were insane, we could allow contextual 1288 // conversions to integer type here. 1289 if (ArraySize && !ArraySize->isTypeDependent() && 1290 !ArraySize->getType()->isIntegralOrUnscopedEnumerationType()) { 1291 Diag(ArraySize->getLocStart(), diag::err_array_size_non_int) 1292 << ArraySize->getType() << ArraySize->getSourceRange(); 1293 return QualType(); 1294 } 1295 llvm::APSInt ConstVal(Context.getTypeSize(Context.getSizeType())); 1296 if (!ArraySize) { 1297 if (ASM == ArrayType::Star) 1298 T = Context.getVariableArrayType(T, 0, ASM, Quals, Brackets); 1299 else 1300 T = Context.getIncompleteArrayType(T, ASM, Quals); 1301 } else if (ArraySize->isTypeDependent() || ArraySize->isValueDependent()) { 1302 T = Context.getDependentSizedArrayType(T, ArraySize, ASM, Quals, Brackets); 1303 } else if (!T->isDependentType() && !T->isIncompleteType() && 1304 !T->isConstantSizeType()) { 1305 // C99: an array with an element type that has a non-constant-size is a VLA. 1306 T = Context.getVariableArrayType(T, ArraySize, ASM, Quals, Brackets); 1307 } else if (isArraySizeVLA(ArraySize, ConstVal, *this)) { 1308 // C99: an array with a non-ICE size is a VLA. We accept any expression 1309 // that we can fold to a non-zero positive value as an extension. 1310 T = Context.getVariableArrayType(T, ArraySize, ASM, Quals, Brackets); 1311 } else { 1312 // C99 6.7.5.2p1: If the expression is a constant expression, it shall 1313 // have a value greater than zero. 1314 if (ConstVal.isSigned() && ConstVal.isNegative()) { 1315 if (Entity) 1316 Diag(ArraySize->getLocStart(), diag::err_decl_negative_array_size) 1317 << getPrintableNameForEntity(Entity) << ArraySize->getSourceRange(); 1318 else 1319 Diag(ArraySize->getLocStart(), diag::err_typecheck_negative_array_size) 1320 << ArraySize->getSourceRange(); 1321 return QualType(); 1322 } 1323 if (ConstVal == 0) { 1324 // GCC accepts zero sized static arrays. We allow them when 1325 // we're not in a SFINAE context. 1326 Diag(ArraySize->getLocStart(), 1327 isSFINAEContext()? diag::err_typecheck_zero_array_size 1328 : diag::ext_typecheck_zero_array_size) 1329 << ArraySize->getSourceRange(); 1330 1331 if (ASM == ArrayType::Static) { 1332 Diag(ArraySize->getLocStart(), 1333 diag::warn_typecheck_zero_static_array_size) 1334 << ArraySize->getSourceRange(); 1335 ASM = ArrayType::Normal; 1336 } 1337 } else if (!T->isDependentType() && !T->isVariablyModifiedType() && 1338 !T->isIncompleteType()) { 1339 // Is the array too large? 1340 unsigned ActiveSizeBits 1341 = ConstantArrayType::getNumAddressingBits(Context, T, ConstVal); 1342 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) 1343 Diag(ArraySize->getLocStart(), diag::err_array_too_large) 1344 << ConstVal.toString(10) 1345 << ArraySize->getSourceRange(); 1346 } 1347 1348 T = Context.getConstantArrayType(T, ConstVal, ASM, Quals); 1349 } 1350 // If this is not C99, extwarn about VLA's and C99 array size modifiers. 1351 if (!getLangOptions().C99) { 1352 if (T->isVariableArrayType()) { 1353 // Prohibit the use of non-POD types in VLAs. 1354 QualType BaseT = Context.getBaseElementType(T); 1355 if (!T->isDependentType() && 1356 !BaseT.isPODType(Context) && 1357 !BaseT->isObjCLifetimeType()) { 1358 Diag(Loc, diag::err_vla_non_pod) 1359 << BaseT; 1360 return QualType(); 1361 } 1362 // Prohibit the use of VLAs during template argument deduction. 1363 else if (isSFINAEContext()) { 1364 Diag(Loc, diag::err_vla_in_sfinae); 1365 return QualType(); 1366 } 1367 // Just extwarn about VLAs. 1368 else 1369 Diag(Loc, diag::ext_vla); 1370 } else if (ASM != ArrayType::Normal || Quals != 0) 1371 Diag(Loc, 1372 getLangOptions().CPlusPlus? diag::err_c99_array_usage_cxx 1373 : diag::ext_c99_array_usage) << ASM; 1374 } 1375 1376 return T; 1377} 1378 1379/// \brief Build an ext-vector type. 1380/// 1381/// Run the required checks for the extended vector type. 1382QualType Sema::BuildExtVectorType(QualType T, Expr *ArraySize, 1383 SourceLocation AttrLoc) { 1384 // unlike gcc's vector_size attribute, we do not allow vectors to be defined 1385 // in conjunction with complex types (pointers, arrays, functions, etc.). 1386 if (!T->isDependentType() && 1387 !T->isIntegerType() && !T->isRealFloatingType()) { 1388 Diag(AttrLoc, diag::err_attribute_invalid_vector_type) << T; 1389 return QualType(); 1390 } 1391 1392 if (!ArraySize->isTypeDependent() && !ArraySize->isValueDependent()) { 1393 llvm::APSInt vecSize(32); 1394 if (!ArraySize->isIntegerConstantExpr(vecSize, Context)) { 1395 Diag(AttrLoc, diag::err_attribute_argument_not_int) 1396 << "ext_vector_type" << ArraySize->getSourceRange(); 1397 return QualType(); 1398 } 1399 1400 // unlike gcc's vector_size attribute, the size is specified as the 1401 // number of elements, not the number of bytes. 1402 unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue()); 1403 1404 if (vectorSize == 0) { 1405 Diag(AttrLoc, diag::err_attribute_zero_size) 1406 << ArraySize->getSourceRange(); 1407 return QualType(); 1408 } 1409 1410 return Context.getExtVectorType(T, vectorSize); 1411 } 1412 1413 return Context.getDependentSizedExtVectorType(T, ArraySize, AttrLoc); 1414} 1415 1416/// \brief Build a function type. 1417/// 1418/// This routine checks the function type according to C++ rules and 1419/// under the assumption that the result type and parameter types have 1420/// just been instantiated from a template. It therefore duplicates 1421/// some of the behavior of GetTypeForDeclarator, but in a much 1422/// simpler form that is only suitable for this narrow use case. 1423/// 1424/// \param T The return type of the function. 1425/// 1426/// \param ParamTypes The parameter types of the function. This array 1427/// will be modified to account for adjustments to the types of the 1428/// function parameters. 1429/// 1430/// \param NumParamTypes The number of parameter types in ParamTypes. 1431/// 1432/// \param Variadic Whether this is a variadic function type. 1433/// 1434/// \param Quals The cvr-qualifiers to be applied to the function type. 1435/// 1436/// \param Loc The location of the entity whose type involves this 1437/// function type or, if there is no such entity, the location of the 1438/// type that will have function type. 1439/// 1440/// \param Entity The name of the entity that involves the function 1441/// type, if known. 1442/// 1443/// \returns A suitable function type, if there are no 1444/// errors. Otherwise, returns a NULL type. 1445QualType Sema::BuildFunctionType(QualType T, 1446 QualType *ParamTypes, 1447 unsigned NumParamTypes, 1448 bool Variadic, unsigned Quals, 1449 RefQualifierKind RefQualifier, 1450 SourceLocation Loc, DeclarationName Entity, 1451 FunctionType::ExtInfo Info) { 1452 if (T->isArrayType() || T->isFunctionType()) { 1453 Diag(Loc, diag::err_func_returning_array_function) 1454 << T->isFunctionType() << T; 1455 return QualType(); 1456 } 1457 1458 // Functions cannot return half FP. 1459 if (T->isHalfType()) { 1460 Diag(Loc, diag::err_parameters_retval_cannot_have_fp16_type) << 1 << 1461 FixItHint::CreateInsertion(Loc, "*"); 1462 return QualType(); 1463 } 1464 1465 bool Invalid = false; 1466 for (unsigned Idx = 0; Idx < NumParamTypes; ++Idx) { 1467 // FIXME: Loc is too inprecise here, should use proper locations for args. 1468 QualType ParamType = Context.getAdjustedParameterType(ParamTypes[Idx]); 1469 if (ParamType->isVoidType()) { 1470 Diag(Loc, diag::err_param_with_void_type); 1471 Invalid = true; 1472 } else if (ParamType->isHalfType()) { 1473 // Disallow half FP arguments. 1474 Diag(Loc, diag::err_parameters_retval_cannot_have_fp16_type) << 0 << 1475 FixItHint::CreateInsertion(Loc, "*"); 1476 Invalid = true; 1477 } 1478 1479 ParamTypes[Idx] = ParamType; 1480 } 1481 1482 if (Invalid) 1483 return QualType(); 1484 1485 FunctionProtoType::ExtProtoInfo EPI; 1486 EPI.Variadic = Variadic; 1487 EPI.TypeQuals = Quals; 1488 EPI.RefQualifier = RefQualifier; 1489 EPI.ExtInfo = Info; 1490 1491 return Context.getFunctionType(T, ParamTypes, NumParamTypes, EPI); 1492} 1493 1494/// \brief Build a member pointer type \c T Class::*. 1495/// 1496/// \param T the type to which the member pointer refers. 1497/// \param Class the class type into which the member pointer points. 1498/// \param CVR Qualifiers applied to the member pointer type 1499/// \param Loc the location where this type begins 1500/// \param Entity the name of the entity that will have this member pointer type 1501/// 1502/// \returns a member pointer type, if successful, or a NULL type if there was 1503/// an error. 1504QualType Sema::BuildMemberPointerType(QualType T, QualType Class, 1505 SourceLocation Loc, 1506 DeclarationName Entity) { 1507 // Verify that we're not building a pointer to pointer to function with 1508 // exception specification. 1509 if (CheckDistantExceptionSpec(T)) { 1510 Diag(Loc, diag::err_distant_exception_spec); 1511 1512 // FIXME: If we're doing this as part of template instantiation, 1513 // we should return immediately. 1514 1515 // Build the type anyway, but use the canonical type so that the 1516 // exception specifiers are stripped off. 1517 T = Context.getCanonicalType(T); 1518 } 1519 1520 // C++ 8.3.3p3: A pointer to member shall not point to ... a member 1521 // with reference type, or "cv void." 1522 if (T->isReferenceType()) { 1523 Diag(Loc, diag::err_illegal_decl_mempointer_to_reference) 1524 << (Entity? Entity.getAsString() : "type name") << T; 1525 return QualType(); 1526 } 1527 1528 if (T->isVoidType()) { 1529 Diag(Loc, diag::err_illegal_decl_mempointer_to_void) 1530 << (Entity? Entity.getAsString() : "type name"); 1531 return QualType(); 1532 } 1533 1534 if (!Class->isDependentType() && !Class->isRecordType()) { 1535 Diag(Loc, diag::err_mempointer_in_nonclass_type) << Class; 1536 return QualType(); 1537 } 1538 1539 // In the Microsoft ABI, the class is allowed to be an incomplete 1540 // type. In such cases, the compiler makes a worst-case assumption. 1541 // We make no such assumption right now, so emit an error if the 1542 // class isn't a complete type. 1543 if (Context.getTargetInfo().getCXXABI() == CXXABI_Microsoft && 1544 RequireCompleteType(Loc, Class, diag::err_incomplete_type)) 1545 return QualType(); 1546 1547 return Context.getMemberPointerType(T, Class.getTypePtr()); 1548} 1549 1550/// \brief Build a block pointer type. 1551/// 1552/// \param T The type to which we'll be building a block pointer. 1553/// 1554/// \param CVR The cvr-qualifiers to be applied to the block pointer type. 1555/// 1556/// \param Loc The location of the entity whose type involves this 1557/// block pointer type or, if there is no such entity, the location of the 1558/// type that will have block pointer type. 1559/// 1560/// \param Entity The name of the entity that involves the block pointer 1561/// type, if known. 1562/// 1563/// \returns A suitable block pointer type, if there are no 1564/// errors. Otherwise, returns a NULL type. 1565QualType Sema::BuildBlockPointerType(QualType T, 1566 SourceLocation Loc, 1567 DeclarationName Entity) { 1568 if (!T->isFunctionType()) { 1569 Diag(Loc, diag::err_nonfunction_block_type); 1570 return QualType(); 1571 } 1572 1573 return Context.getBlockPointerType(T); 1574} 1575 1576QualType Sema::GetTypeFromParser(ParsedType Ty, TypeSourceInfo **TInfo) { 1577 QualType QT = Ty.get(); 1578 if (QT.isNull()) { 1579 if (TInfo) *TInfo = 0; 1580 return QualType(); 1581 } 1582 1583 TypeSourceInfo *DI = 0; 1584 if (const LocInfoType *LIT = dyn_cast<LocInfoType>(QT)) { 1585 QT = LIT->getType(); 1586 DI = LIT->getTypeSourceInfo(); 1587 } 1588 1589 if (TInfo) *TInfo = DI; 1590 return QT; 1591} 1592 1593static void transferARCOwnershipToDeclaratorChunk(TypeProcessingState &state, 1594 Qualifiers::ObjCLifetime ownership, 1595 unsigned chunkIndex); 1596 1597/// Given that this is the declaration of a parameter under ARC, 1598/// attempt to infer attributes and such for pointer-to-whatever 1599/// types. 1600static void inferARCWriteback(TypeProcessingState &state, 1601 QualType &declSpecType) { 1602 Sema &S = state.getSema(); 1603 Declarator &declarator = state.getDeclarator(); 1604 1605 // TODO: should we care about decl qualifiers? 1606 1607 // Check whether the declarator has the expected form. We walk 1608 // from the inside out in order to make the block logic work. 1609 unsigned outermostPointerIndex = 0; 1610 bool isBlockPointer = false; 1611 unsigned numPointers = 0; 1612 for (unsigned i = 0, e = declarator.getNumTypeObjects(); i != e; ++i) { 1613 unsigned chunkIndex = i; 1614 DeclaratorChunk &chunk = declarator.getTypeObject(chunkIndex); 1615 switch (chunk.Kind) { 1616 case DeclaratorChunk::Paren: 1617 // Ignore parens. 1618 break; 1619 1620 case DeclaratorChunk::Reference: 1621 case DeclaratorChunk::Pointer: 1622 // Count the number of pointers. Treat references 1623 // interchangeably as pointers; if they're mis-ordered, normal 1624 // type building will discover that. 1625 outermostPointerIndex = chunkIndex; 1626 numPointers++; 1627 break; 1628 1629 case DeclaratorChunk::BlockPointer: 1630 // If we have a pointer to block pointer, that's an acceptable 1631 // indirect reference; anything else is not an application of 1632 // the rules. 1633 if (numPointers != 1) return; 1634 numPointers++; 1635 outermostPointerIndex = chunkIndex; 1636 isBlockPointer = true; 1637 1638 // We don't care about pointer structure in return values here. 1639 goto done; 1640 1641 case DeclaratorChunk::Array: // suppress if written (id[])? 1642 case DeclaratorChunk::Function: 1643 case DeclaratorChunk::MemberPointer: 1644 return; 1645 } 1646 } 1647 done: 1648 1649 // If we have *one* pointer, then we want to throw the qualifier on 1650 // the declaration-specifiers, which means that it needs to be a 1651 // retainable object type. 1652 if (numPointers == 1) { 1653 // If it's not a retainable object type, the rule doesn't apply. 1654 if (!declSpecType->isObjCRetainableType()) return; 1655 1656 // If it already has lifetime, don't do anything. 1657 if (declSpecType.getObjCLifetime()) return; 1658 1659 // Otherwise, modify the type in-place. 1660 Qualifiers qs; 1661 1662 if (declSpecType->isObjCARCImplicitlyUnretainedType()) 1663 qs.addObjCLifetime(Qualifiers::OCL_ExplicitNone); 1664 else 1665 qs.addObjCLifetime(Qualifiers::OCL_Autoreleasing); 1666 declSpecType = S.Context.getQualifiedType(declSpecType, qs); 1667 1668 // If we have *two* pointers, then we want to throw the qualifier on 1669 // the outermost pointer. 1670 } else if (numPointers == 2) { 1671 // If we don't have a block pointer, we need to check whether the 1672 // declaration-specifiers gave us something that will turn into a 1673 // retainable object pointer after we slap the first pointer on it. 1674 if (!isBlockPointer && !declSpecType->isObjCObjectType()) 1675 return; 1676 1677 // Look for an explicit lifetime attribute there. 1678 DeclaratorChunk &chunk = declarator.getTypeObject(outermostPointerIndex); 1679 if (chunk.Kind != DeclaratorChunk::Pointer && 1680 chunk.Kind != DeclaratorChunk::BlockPointer) 1681 return; 1682 for (const AttributeList *attr = chunk.getAttrs(); attr; 1683 attr = attr->getNext()) 1684 if (attr->getKind() == AttributeList::AT_objc_ownership) 1685 return; 1686 1687 transferARCOwnershipToDeclaratorChunk(state, Qualifiers::OCL_Autoreleasing, 1688 outermostPointerIndex); 1689 1690 // Any other number of pointers/references does not trigger the rule. 1691 } else return; 1692 1693 // TODO: mark whether we did this inference? 1694} 1695 1696static void DiagnoseIgnoredQualifiers(unsigned Quals, 1697 SourceLocation ConstQualLoc, 1698 SourceLocation VolatileQualLoc, 1699 SourceLocation RestrictQualLoc, 1700 Sema& S) { 1701 std::string QualStr; 1702 unsigned NumQuals = 0; 1703 SourceLocation Loc; 1704 1705 FixItHint ConstFixIt; 1706 FixItHint VolatileFixIt; 1707 FixItHint RestrictFixIt; 1708 1709 const SourceManager &SM = S.getSourceManager(); 1710 1711 // FIXME: The locations here are set kind of arbitrarily. It'd be nicer to 1712 // find a range and grow it to encompass all the qualifiers, regardless of 1713 // the order in which they textually appear. 1714 if (Quals & Qualifiers::Const) { 1715 ConstFixIt = FixItHint::CreateRemoval(ConstQualLoc); 1716 QualStr = "const"; 1717 ++NumQuals; 1718 if (!Loc.isValid() || SM.isBeforeInTranslationUnit(ConstQualLoc, Loc)) 1719 Loc = ConstQualLoc; 1720 } 1721 if (Quals & Qualifiers::Volatile) { 1722 VolatileFixIt = FixItHint::CreateRemoval(VolatileQualLoc); 1723 QualStr += (NumQuals == 0 ? "volatile" : " volatile"); 1724 ++NumQuals; 1725 if (!Loc.isValid() || SM.isBeforeInTranslationUnit(VolatileQualLoc, Loc)) 1726 Loc = VolatileQualLoc; 1727 } 1728 if (Quals & Qualifiers::Restrict) { 1729 RestrictFixIt = FixItHint::CreateRemoval(RestrictQualLoc); 1730 QualStr += (NumQuals == 0 ? "restrict" : " restrict"); 1731 ++NumQuals; 1732 if (!Loc.isValid() || SM.isBeforeInTranslationUnit(RestrictQualLoc, Loc)) 1733 Loc = RestrictQualLoc; 1734 } 1735 1736 assert(NumQuals > 0 && "No known qualifiers?"); 1737 1738 S.Diag(Loc, diag::warn_qual_return_type) 1739 << QualStr << NumQuals << ConstFixIt << VolatileFixIt << RestrictFixIt; 1740} 1741 1742static QualType GetDeclSpecTypeForDeclarator(TypeProcessingState &state, 1743 TypeSourceInfo *&ReturnTypeInfo) { 1744 Sema &SemaRef = state.getSema(); 1745 Declarator &D = state.getDeclarator(); 1746 QualType T; 1747 ReturnTypeInfo = 0; 1748 1749 // The TagDecl owned by the DeclSpec. 1750 TagDecl *OwnedTagDecl = 0; 1751 1752 switch (D.getName().getKind()) { 1753 case UnqualifiedId::IK_ImplicitSelfParam: 1754 case UnqualifiedId::IK_OperatorFunctionId: 1755 case UnqualifiedId::IK_Identifier: 1756 case UnqualifiedId::IK_LiteralOperatorId: 1757 case UnqualifiedId::IK_TemplateId: 1758 T = ConvertDeclSpecToType(state); 1759 1760 if (!D.isInvalidType() && D.getDeclSpec().isTypeSpecOwned()) { 1761 OwnedTagDecl = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 1762 // Owned declaration is embedded in declarator. 1763 OwnedTagDecl->setEmbeddedInDeclarator(true); 1764 } 1765 break; 1766 1767 case UnqualifiedId::IK_ConstructorName: 1768 case UnqualifiedId::IK_ConstructorTemplateId: 1769 case UnqualifiedId::IK_DestructorName: 1770 // Constructors and destructors don't have return types. Use 1771 // "void" instead. 1772 T = SemaRef.Context.VoidTy; 1773 break; 1774 1775 case UnqualifiedId::IK_ConversionFunctionId: 1776 // The result type of a conversion function is the type that it 1777 // converts to. 1778 T = SemaRef.GetTypeFromParser(D.getName().ConversionFunctionId, 1779 &ReturnTypeInfo); 1780 break; 1781 } 1782 1783 if (D.getAttributes()) 1784 distributeTypeAttrsFromDeclarator(state, T); 1785 1786 // C++0x [dcl.spec.auto]p5: reject 'auto' if it is not in an allowed context. 1787 // In C++0x, a function declarator using 'auto' must have a trailing return 1788 // type (this is checked later) and we can skip this. In other languages 1789 // using auto, we need to check regardless. 1790 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto && 1791 (!SemaRef.getLangOptions().CPlusPlus0x || !D.isFunctionDeclarator())) { 1792 int Error = -1; 1793 1794 switch (D.getContext()) { 1795 case Declarator::KNRTypeListContext: 1796 llvm_unreachable("K&R type lists aren't allowed in C++"); 1797 break; 1798 case Declarator::LambdaExprContext: 1799 llvm_unreachable("Can't specify a type specifier in lambda grammar"); 1800 break; 1801 case Declarator::ObjCParameterContext: 1802 case Declarator::ObjCResultContext: 1803 case Declarator::PrototypeContext: 1804 Error = 0; // Function prototype 1805 break; 1806 case Declarator::MemberContext: 1807 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_static) 1808 break; 1809 switch (cast<TagDecl>(SemaRef.CurContext)->getTagKind()) { 1810 case TTK_Enum: llvm_unreachable("unhandled tag kind"); 1811 case TTK_Struct: Error = 1; /* Struct member */ break; 1812 case TTK_Union: Error = 2; /* Union member */ break; 1813 case TTK_Class: Error = 3; /* Class member */ break; 1814 } 1815 break; 1816 case Declarator::CXXCatchContext: 1817 case Declarator::ObjCCatchContext: 1818 Error = 4; // Exception declaration 1819 break; 1820 case Declarator::TemplateParamContext: 1821 Error = 5; // Template parameter 1822 break; 1823 case Declarator::BlockLiteralContext: 1824 Error = 6; // Block literal 1825 break; 1826 case Declarator::TemplateTypeArgContext: 1827 Error = 7; // Template type argument 1828 break; 1829 case Declarator::AliasDeclContext: 1830 case Declarator::AliasTemplateContext: 1831 Error = 9; // Type alias 1832 break; 1833 case Declarator::TypeNameContext: 1834 Error = 11; // Generic 1835 break; 1836 case Declarator::FileContext: 1837 case Declarator::BlockContext: 1838 case Declarator::ForContext: 1839 case Declarator::ConditionContext: 1840 case Declarator::CXXNewContext: 1841 break; 1842 } 1843 1844 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 1845 Error = 8; 1846 1847 // In Objective-C it is an error to use 'auto' on a function declarator. 1848 if (D.isFunctionDeclarator()) 1849 Error = 10; 1850 1851 // C++0x [dcl.spec.auto]p2: 'auto' is always fine if the declarator 1852 // contains a trailing return type. That is only legal at the outermost 1853 // level. Check all declarator chunks (outermost first) anyway, to give 1854 // better diagnostics. 1855 if (SemaRef.getLangOptions().CPlusPlus0x && Error != -1) { 1856 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 1857 unsigned chunkIndex = e - i - 1; 1858 state.setCurrentChunkIndex(chunkIndex); 1859 DeclaratorChunk &DeclType = D.getTypeObject(chunkIndex); 1860 if (DeclType.Kind == DeclaratorChunk::Function) { 1861 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun; 1862 if (FTI.TrailingReturnType) { 1863 Error = -1; 1864 break; 1865 } 1866 } 1867 } 1868 } 1869 1870 if (Error != -1) { 1871 SemaRef.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 1872 diag::err_auto_not_allowed) 1873 << Error; 1874 T = SemaRef.Context.IntTy; 1875 D.setInvalidType(true); 1876 } else 1877 SemaRef.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 1878 diag::warn_cxx98_compat_auto_type_specifier); 1879 } 1880 1881 if (SemaRef.getLangOptions().CPlusPlus && 1882 OwnedTagDecl && OwnedTagDecl->isCompleteDefinition()) { 1883 // Check the contexts where C++ forbids the declaration of a new class 1884 // or enumeration in a type-specifier-seq. 1885 switch (D.getContext()) { 1886 case Declarator::FileContext: 1887 case Declarator::MemberContext: 1888 case Declarator::BlockContext: 1889 case Declarator::ForContext: 1890 case Declarator::BlockLiteralContext: 1891 case Declarator::LambdaExprContext: 1892 // C++0x [dcl.type]p3: 1893 // A type-specifier-seq shall not define a class or enumeration unless 1894 // it appears in the type-id of an alias-declaration (7.1.3) that is not 1895 // the declaration of a template-declaration. 1896 case Declarator::AliasDeclContext: 1897 break; 1898 case Declarator::AliasTemplateContext: 1899 SemaRef.Diag(OwnedTagDecl->getLocation(), 1900 diag::err_type_defined_in_alias_template) 1901 << SemaRef.Context.getTypeDeclType(OwnedTagDecl); 1902 break; 1903 case Declarator::TypeNameContext: 1904 case Declarator::TemplateParamContext: 1905 case Declarator::CXXNewContext: 1906 case Declarator::CXXCatchContext: 1907 case Declarator::ObjCCatchContext: 1908 case Declarator::TemplateTypeArgContext: 1909 SemaRef.Diag(OwnedTagDecl->getLocation(), 1910 diag::err_type_defined_in_type_specifier) 1911 << SemaRef.Context.getTypeDeclType(OwnedTagDecl); 1912 break; 1913 case Declarator::PrototypeContext: 1914 case Declarator::ObjCParameterContext: 1915 case Declarator::ObjCResultContext: 1916 case Declarator::KNRTypeListContext: 1917 // C++ [dcl.fct]p6: 1918 // Types shall not be defined in return or parameter types. 1919 SemaRef.Diag(OwnedTagDecl->getLocation(), 1920 diag::err_type_defined_in_param_type) 1921 << SemaRef.Context.getTypeDeclType(OwnedTagDecl); 1922 break; 1923 case Declarator::ConditionContext: 1924 // C++ 6.4p2: 1925 // The type-specifier-seq shall not contain typedef and shall not declare 1926 // a new class or enumeration. 1927 SemaRef.Diag(OwnedTagDecl->getLocation(), 1928 diag::err_type_defined_in_condition); 1929 break; 1930 } 1931 } 1932 1933 return T; 1934} 1935 1936static TypeSourceInfo *GetFullTypeForDeclarator(TypeProcessingState &state, 1937 QualType declSpecType, 1938 TypeSourceInfo *TInfo) { 1939 1940 QualType T = declSpecType; 1941 Declarator &D = state.getDeclarator(); 1942 Sema &S = state.getSema(); 1943 ASTContext &Context = S.Context; 1944 const LangOptions &LangOpts = S.getLangOptions(); 1945 1946 bool ImplicitlyNoexcept = false; 1947 if (D.getName().getKind() == UnqualifiedId::IK_OperatorFunctionId && 1948 LangOpts.CPlusPlus0x) { 1949 OverloadedOperatorKind OO = D.getName().OperatorFunctionId.Operator; 1950 /// In C++0x, deallocation functions (normal and array operator delete) 1951 /// are implicitly noexcept. 1952 if (OO == OO_Delete || OO == OO_Array_Delete) 1953 ImplicitlyNoexcept = true; 1954 } 1955 1956 // The name we're declaring, if any. 1957 DeclarationName Name; 1958 if (D.getIdentifier()) 1959 Name = D.getIdentifier(); 1960 1961 // Does this declaration declare a typedef-name? 1962 bool IsTypedefName = 1963 D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef || 1964 D.getContext() == Declarator::AliasDeclContext || 1965 D.getContext() == Declarator::AliasTemplateContext; 1966 1967 // Walk the DeclTypeInfo, building the recursive type as we go. 1968 // DeclTypeInfos are ordered from the identifier out, which is 1969 // opposite of what we want :). 1970 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 1971 unsigned chunkIndex = e - i - 1; 1972 state.setCurrentChunkIndex(chunkIndex); 1973 DeclaratorChunk &DeclType = D.getTypeObject(chunkIndex); 1974 switch (DeclType.Kind) { 1975 case DeclaratorChunk::Paren: 1976 T = S.BuildParenType(T); 1977 break; 1978 case DeclaratorChunk::BlockPointer: 1979 // If blocks are disabled, emit an error. 1980 if (!LangOpts.Blocks) 1981 S.Diag(DeclType.Loc, diag::err_blocks_disable); 1982 1983 T = S.BuildBlockPointerType(T, D.getIdentifierLoc(), Name); 1984 if (DeclType.Cls.TypeQuals) 1985 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Cls.TypeQuals); 1986 break; 1987 case DeclaratorChunk::Pointer: 1988 // Verify that we're not building a pointer to pointer to function with 1989 // exception specification. 1990 if (LangOpts.CPlusPlus && S.CheckDistantExceptionSpec(T)) { 1991 S.Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 1992 D.setInvalidType(true); 1993 // Build the type anyway. 1994 } 1995 if (LangOpts.ObjC1 && T->getAs<ObjCObjectType>()) { 1996 T = Context.getObjCObjectPointerType(T); 1997 if (DeclType.Ptr.TypeQuals) 1998 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Ptr.TypeQuals); 1999 break; 2000 } 2001 T = S.BuildPointerType(T, DeclType.Loc, Name); 2002 if (DeclType.Ptr.TypeQuals) 2003 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Ptr.TypeQuals); 2004 2005 break; 2006 case DeclaratorChunk::Reference: { 2007 // Verify that we're not building a reference to pointer to function with 2008 // exception specification. 2009 if (LangOpts.CPlusPlus && S.CheckDistantExceptionSpec(T)) { 2010 S.Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 2011 D.setInvalidType(true); 2012 // Build the type anyway. 2013 } 2014 T = S.BuildReferenceType(T, DeclType.Ref.LValueRef, DeclType.Loc, Name); 2015 2016 Qualifiers Quals; 2017 if (DeclType.Ref.HasRestrict) 2018 T = S.BuildQualifiedType(T, DeclType.Loc, Qualifiers::Restrict); 2019 break; 2020 } 2021 case DeclaratorChunk::Array: { 2022 // Verify that we're not building an array of pointers to function with 2023 // exception specification. 2024 if (LangOpts.CPlusPlus && S.CheckDistantExceptionSpec(T)) { 2025 S.Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 2026 D.setInvalidType(true); 2027 // Build the type anyway. 2028 } 2029 DeclaratorChunk::ArrayTypeInfo &ATI = DeclType.Arr; 2030 Expr *ArraySize = static_cast<Expr*>(ATI.NumElts); 2031 ArrayType::ArraySizeModifier ASM; 2032 if (ATI.isStar) 2033 ASM = ArrayType::Star; 2034 else if (ATI.hasStatic) 2035 ASM = ArrayType::Static; 2036 else 2037 ASM = ArrayType::Normal; 2038 if (ASM == ArrayType::Star && !D.isPrototypeContext()) { 2039 // FIXME: This check isn't quite right: it allows star in prototypes 2040 // for function definitions, and disallows some edge cases detailed 2041 // in http://gcc.gnu.org/ml/gcc-patches/2009-02/msg00133.html 2042 S.Diag(DeclType.Loc, diag::err_array_star_outside_prototype); 2043 ASM = ArrayType::Normal; 2044 D.setInvalidType(true); 2045 } 2046 T = S.BuildArrayType(T, ASM, ArraySize, ATI.TypeQuals, 2047 SourceRange(DeclType.Loc, DeclType.EndLoc), Name); 2048 break; 2049 } 2050 case DeclaratorChunk::Function: { 2051 // If the function declarator has a prototype (i.e. it is not () and 2052 // does not have a K&R-style identifier list), then the arguments are part 2053 // of the type, otherwise the argument list is (). 2054 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun; 2055 2056 // Check for auto functions and trailing return type and adjust the 2057 // return type accordingly. 2058 if (!D.isInvalidType()) { 2059 // trailing-return-type is only required if we're declaring a function, 2060 // and not, for instance, a pointer to a function. 2061 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto && 2062 !FTI.TrailingReturnType && chunkIndex == 0) { 2063 S.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 2064 diag::err_auto_missing_trailing_return); 2065 T = Context.IntTy; 2066 D.setInvalidType(true); 2067 } else if (FTI.TrailingReturnType) { 2068 // T must be exactly 'auto' at this point. See CWG issue 681. 2069 if (isa<ParenType>(T)) { 2070 S.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 2071 diag::err_trailing_return_in_parens) 2072 << T << D.getDeclSpec().getSourceRange(); 2073 D.setInvalidType(true); 2074 } else if (D.getContext() != Declarator::LambdaExprContext && 2075 (T.hasQualifiers() || !isa<AutoType>(T))) { 2076 S.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 2077 diag::err_trailing_return_without_auto) 2078 << T << D.getDeclSpec().getSourceRange(); 2079 D.setInvalidType(true); 2080 } 2081 2082 T = S.GetTypeFromParser( 2083 ParsedType::getFromOpaquePtr(FTI.TrailingReturnType), 2084 &TInfo); 2085 } 2086 } 2087 2088 // C99 6.7.5.3p1: The return type may not be a function or array type. 2089 // For conversion functions, we'll diagnose this particular error later. 2090 if ((T->isArrayType() || T->isFunctionType()) && 2091 (D.getName().getKind() != UnqualifiedId::IK_ConversionFunctionId)) { 2092 unsigned diagID = diag::err_func_returning_array_function; 2093 // Last processing chunk in block context means this function chunk 2094 // represents the block. 2095 if (chunkIndex == 0 && 2096 D.getContext() == Declarator::BlockLiteralContext) 2097 diagID = diag::err_block_returning_array_function; 2098 S.Diag(DeclType.Loc, diagID) << T->isFunctionType() << T; 2099 T = Context.IntTy; 2100 D.setInvalidType(true); 2101 } 2102 2103 // Do not allow returning half FP value. 2104 // FIXME: This really should be in BuildFunctionType. 2105 if (T->isHalfType()) { 2106 S.Diag(D.getIdentifierLoc(), 2107 diag::err_parameters_retval_cannot_have_fp16_type) << 1 2108 << FixItHint::CreateInsertion(D.getIdentifierLoc(), "*"); 2109 D.setInvalidType(true); 2110 } 2111 2112 // cv-qualifiers on return types are pointless except when the type is a 2113 // class type in C++. 2114 if (isa<PointerType>(T) && T.getLocalCVRQualifiers() && 2115 (D.getName().getKind() != UnqualifiedId::IK_ConversionFunctionId) && 2116 (!LangOpts.CPlusPlus || !T->isDependentType())) { 2117 assert(chunkIndex + 1 < e && "No DeclaratorChunk for the return type?"); 2118 DeclaratorChunk ReturnTypeChunk = D.getTypeObject(chunkIndex + 1); 2119 assert(ReturnTypeChunk.Kind == DeclaratorChunk::Pointer); 2120 2121 DeclaratorChunk::PointerTypeInfo &PTI = ReturnTypeChunk.Ptr; 2122 2123 DiagnoseIgnoredQualifiers(PTI.TypeQuals, 2124 SourceLocation::getFromRawEncoding(PTI.ConstQualLoc), 2125 SourceLocation::getFromRawEncoding(PTI.VolatileQualLoc), 2126 SourceLocation::getFromRawEncoding(PTI.RestrictQualLoc), 2127 S); 2128 2129 } else if (T.getCVRQualifiers() && D.getDeclSpec().getTypeQualifiers() && 2130 (!LangOpts.CPlusPlus || 2131 (!T->isDependentType() && !T->isRecordType()))) { 2132 2133 DiagnoseIgnoredQualifiers(D.getDeclSpec().getTypeQualifiers(), 2134 D.getDeclSpec().getConstSpecLoc(), 2135 D.getDeclSpec().getVolatileSpecLoc(), 2136 D.getDeclSpec().getRestrictSpecLoc(), 2137 S); 2138 } 2139 2140 if (LangOpts.CPlusPlus && D.getDeclSpec().isTypeSpecOwned()) { 2141 // C++ [dcl.fct]p6: 2142 // Types shall not be defined in return or parameter types. 2143 TagDecl *Tag = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 2144 if (Tag->isCompleteDefinition()) 2145 S.Diag(Tag->getLocation(), diag::err_type_defined_in_result_type) 2146 << Context.getTypeDeclType(Tag); 2147 } 2148 2149 // Exception specs are not allowed in typedefs. Complain, but add it 2150 // anyway. 2151 if (IsTypedefName && FTI.getExceptionSpecType()) 2152 S.Diag(FTI.getExceptionSpecLoc(), diag::err_exception_spec_in_typedef) 2153 << (D.getContext() == Declarator::AliasDeclContext || 2154 D.getContext() == Declarator::AliasTemplateContext); 2155 2156 if (!FTI.NumArgs && !FTI.isVariadic && !LangOpts.CPlusPlus) { 2157 // Simple void foo(), where the incoming T is the result type. 2158 T = Context.getFunctionNoProtoType(T); 2159 } else { 2160 // We allow a zero-parameter variadic function in C if the 2161 // function is marked with the "overloadable" attribute. Scan 2162 // for this attribute now. 2163 if (!FTI.NumArgs && FTI.isVariadic && !LangOpts.CPlusPlus) { 2164 bool Overloadable = false; 2165 for (const AttributeList *Attrs = D.getAttributes(); 2166 Attrs; Attrs = Attrs->getNext()) { 2167 if (Attrs->getKind() == AttributeList::AT_overloadable) { 2168 Overloadable = true; 2169 break; 2170 } 2171 } 2172 2173 if (!Overloadable) 2174 S.Diag(FTI.getEllipsisLoc(), diag::err_ellipsis_first_arg); 2175 } 2176 2177 if (FTI.NumArgs && FTI.ArgInfo[0].Param == 0) { 2178 // C99 6.7.5.3p3: Reject int(x,y,z) when it's not a function 2179 // definition. 2180 S.Diag(FTI.ArgInfo[0].IdentLoc, diag::err_ident_list_in_fn_declaration); 2181 D.setInvalidType(true); 2182 break; 2183 } 2184 2185 FunctionProtoType::ExtProtoInfo EPI; 2186 EPI.Variadic = FTI.isVariadic; 2187 EPI.TypeQuals = FTI.TypeQuals; 2188 EPI.RefQualifier = !FTI.hasRefQualifier()? RQ_None 2189 : FTI.RefQualifierIsLValueRef? RQ_LValue 2190 : RQ_RValue; 2191 2192 // Otherwise, we have a function with an argument list that is 2193 // potentially variadic. 2194 SmallVector<QualType, 16> ArgTys; 2195 ArgTys.reserve(FTI.NumArgs); 2196 2197 SmallVector<bool, 16> ConsumedArguments; 2198 ConsumedArguments.reserve(FTI.NumArgs); 2199 bool HasAnyConsumedArguments = false; 2200 2201 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 2202 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 2203 QualType ArgTy = Param->getType(); 2204 assert(!ArgTy.isNull() && "Couldn't parse type?"); 2205 2206 // Adjust the parameter type. 2207 assert((ArgTy == Context.getAdjustedParameterType(ArgTy)) && 2208 "Unadjusted type?"); 2209 2210 // Look for 'void'. void is allowed only as a single argument to a 2211 // function with no other parameters (C99 6.7.5.3p10). We record 2212 // int(void) as a FunctionProtoType with an empty argument list. 2213 if (ArgTy->isVoidType()) { 2214 // If this is something like 'float(int, void)', reject it. 'void' 2215 // is an incomplete type (C99 6.2.5p19) and function decls cannot 2216 // have arguments of incomplete type. 2217 if (FTI.NumArgs != 1 || FTI.isVariadic) { 2218 S.Diag(DeclType.Loc, diag::err_void_only_param); 2219 ArgTy = Context.IntTy; 2220 Param->setType(ArgTy); 2221 } else if (FTI.ArgInfo[i].Ident) { 2222 // Reject, but continue to parse 'int(void abc)'. 2223 S.Diag(FTI.ArgInfo[i].IdentLoc, 2224 diag::err_param_with_void_type); 2225 ArgTy = Context.IntTy; 2226 Param->setType(ArgTy); 2227 } else { 2228 // Reject, but continue to parse 'float(const void)'. 2229 if (ArgTy.hasQualifiers()) 2230 S.Diag(DeclType.Loc, diag::err_void_param_qualified); 2231 2232 // Do not add 'void' to the ArgTys list. 2233 break; 2234 } 2235 } else if (ArgTy->isHalfType()) { 2236 // Disallow half FP arguments. 2237 // FIXME: This really should be in BuildFunctionType. 2238 S.Diag(Param->getLocation(), 2239 diag::err_parameters_retval_cannot_have_fp16_type) << 0 2240 << FixItHint::CreateInsertion(Param->getLocation(), "*"); 2241 D.setInvalidType(); 2242 } else if (!FTI.hasPrototype) { 2243 if (ArgTy->isPromotableIntegerType()) { 2244 ArgTy = Context.getPromotedIntegerType(ArgTy); 2245 Param->setKNRPromoted(true); 2246 } else if (const BuiltinType* BTy = ArgTy->getAs<BuiltinType>()) { 2247 if (BTy->getKind() == BuiltinType::Float) { 2248 ArgTy = Context.DoubleTy; 2249 Param->setKNRPromoted(true); 2250 } 2251 } 2252 } 2253 2254 if (LangOpts.ObjCAutoRefCount) { 2255 bool Consumed = Param->hasAttr<NSConsumedAttr>(); 2256 ConsumedArguments.push_back(Consumed); 2257 HasAnyConsumedArguments |= Consumed; 2258 } 2259 2260 ArgTys.push_back(ArgTy); 2261 } 2262 2263 if (HasAnyConsumedArguments) 2264 EPI.ConsumedArguments = ConsumedArguments.data(); 2265 2266 SmallVector<QualType, 4> Exceptions; 2267 EPI.ExceptionSpecType = FTI.getExceptionSpecType(); 2268 if (FTI.getExceptionSpecType() == EST_Dynamic) { 2269 Exceptions.reserve(FTI.NumExceptions); 2270 for (unsigned ei = 0, ee = FTI.NumExceptions; ei != ee; ++ei) { 2271 // FIXME: Preserve type source info. 2272 QualType ET = S.GetTypeFromParser(FTI.Exceptions[ei].Ty); 2273 // Check that the type is valid for an exception spec, and 2274 // drop it if not. 2275 if (!S.CheckSpecifiedExceptionType(ET, FTI.Exceptions[ei].Range)) 2276 Exceptions.push_back(ET); 2277 } 2278 EPI.NumExceptions = Exceptions.size(); 2279 EPI.Exceptions = Exceptions.data(); 2280 } else if (FTI.getExceptionSpecType() == EST_ComputedNoexcept) { 2281 // If an error occurred, there's no expression here. 2282 if (Expr *NoexceptExpr = FTI.NoexceptExpr) { 2283 assert((NoexceptExpr->isTypeDependent() || 2284 NoexceptExpr->getType()->getCanonicalTypeUnqualified() == 2285 Context.BoolTy) && 2286 "Parser should have made sure that the expression is boolean"); 2287 SourceLocation ErrLoc; 2288 llvm::APSInt Dummy; 2289 if (!NoexceptExpr->isValueDependent() && 2290 !NoexceptExpr->isIntegerConstantExpr(Dummy, Context, &ErrLoc, 2291 /*evaluated*/false)) 2292 S.Diag(ErrLoc, diag::err_noexcept_needs_constant_expression) 2293 << NoexceptExpr->getSourceRange(); 2294 else 2295 EPI.NoexceptExpr = NoexceptExpr; 2296 } 2297 } else if (FTI.getExceptionSpecType() == EST_None && 2298 ImplicitlyNoexcept && chunkIndex == 0) { 2299 // Only the outermost chunk is marked noexcept, of course. 2300 EPI.ExceptionSpecType = EST_BasicNoexcept; 2301 } 2302 2303 T = Context.getFunctionType(T, ArgTys.data(), ArgTys.size(), EPI); 2304 } 2305 2306 break; 2307 } 2308 case DeclaratorChunk::MemberPointer: 2309 // The scope spec must refer to a class, or be dependent. 2310 CXXScopeSpec &SS = DeclType.Mem.Scope(); 2311 QualType ClsType; 2312 if (SS.isInvalid()) { 2313 // Avoid emitting extra errors if we already errored on the scope. 2314 D.setInvalidType(true); 2315 } else if (S.isDependentScopeSpecifier(SS) || 2316 dyn_cast_or_null<CXXRecordDecl>(S.computeDeclContext(SS))) { 2317 NestedNameSpecifier *NNS 2318 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 2319 NestedNameSpecifier *NNSPrefix = NNS->getPrefix(); 2320 switch (NNS->getKind()) { 2321 case NestedNameSpecifier::Identifier: 2322 ClsType = Context.getDependentNameType(ETK_None, NNSPrefix, 2323 NNS->getAsIdentifier()); 2324 break; 2325 2326 case NestedNameSpecifier::Namespace: 2327 case NestedNameSpecifier::NamespaceAlias: 2328 case NestedNameSpecifier::Global: 2329 llvm_unreachable("Nested-name-specifier must name a type"); 2330 break; 2331 2332 case NestedNameSpecifier::TypeSpec: 2333 case NestedNameSpecifier::TypeSpecWithTemplate: 2334 ClsType = QualType(NNS->getAsType(), 0); 2335 // Note: if the NNS has a prefix and ClsType is a nondependent 2336 // TemplateSpecializationType, then the NNS prefix is NOT included 2337 // in ClsType; hence we wrap ClsType into an ElaboratedType. 2338 // NOTE: in particular, no wrap occurs if ClsType already is an 2339 // Elaborated, DependentName, or DependentTemplateSpecialization. 2340 if (NNSPrefix && isa<TemplateSpecializationType>(NNS->getAsType())) 2341 ClsType = Context.getElaboratedType(ETK_None, NNSPrefix, ClsType); 2342 break; 2343 } 2344 } else { 2345 S.Diag(DeclType.Mem.Scope().getBeginLoc(), 2346 diag::err_illegal_decl_mempointer_in_nonclass) 2347 << (D.getIdentifier() ? D.getIdentifier()->getName() : "type name") 2348 << DeclType.Mem.Scope().getRange(); 2349 D.setInvalidType(true); 2350 } 2351 2352 if (!ClsType.isNull()) 2353 T = S.BuildMemberPointerType(T, ClsType, DeclType.Loc, D.getIdentifier()); 2354 if (T.isNull()) { 2355 T = Context.IntTy; 2356 D.setInvalidType(true); 2357 } else if (DeclType.Mem.TypeQuals) { 2358 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Mem.TypeQuals); 2359 } 2360 break; 2361 } 2362 2363 if (T.isNull()) { 2364 D.setInvalidType(true); 2365 T = Context.IntTy; 2366 } 2367 2368 // See if there are any attributes on this declarator chunk. 2369 if (AttributeList *attrs = const_cast<AttributeList*>(DeclType.getAttrs())) 2370 processTypeAttrs(state, T, false, attrs); 2371 } 2372 2373 if (LangOpts.CPlusPlus && T->isFunctionType()) { 2374 const FunctionProtoType *FnTy = T->getAs<FunctionProtoType>(); 2375 assert(FnTy && "Why oh why is there not a FunctionProtoType here?"); 2376 2377 // C++ 8.3.5p4: 2378 // A cv-qualifier-seq shall only be part of the function type 2379 // for a nonstatic member function, the function type to which a pointer 2380 // to member refers, or the top-level function type of a function typedef 2381 // declaration. 2382 // 2383 // Core issue 547 also allows cv-qualifiers on function types that are 2384 // top-level template type arguments. 2385 bool FreeFunction; 2386 if (!D.getCXXScopeSpec().isSet()) { 2387 FreeFunction = ((D.getContext() != Declarator::MemberContext && 2388 D.getContext() != Declarator::LambdaExprContext) || 2389 D.getDeclSpec().isFriendSpecified()); 2390 } else { 2391 DeclContext *DC = S.computeDeclContext(D.getCXXScopeSpec()); 2392 FreeFunction = (DC && !DC->isRecord()); 2393 } 2394 2395 // C++0x [dcl.constexpr]p8: A constexpr specifier for a non-static member 2396 // function that is not a constructor declares that function to be const. 2397 if (D.getDeclSpec().isConstexprSpecified() && !FreeFunction && 2398 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static && 2399 D.getName().getKind() != UnqualifiedId::IK_ConstructorName && 2400 D.getName().getKind() != UnqualifiedId::IK_ConstructorTemplateId && 2401 !(FnTy->getTypeQuals() & DeclSpec::TQ_const)) { 2402 // Rebuild function type adding a 'const' qualifier. 2403 FunctionProtoType::ExtProtoInfo EPI = FnTy->getExtProtoInfo(); 2404 EPI.TypeQuals |= DeclSpec::TQ_const; 2405 T = Context.getFunctionType(FnTy->getResultType(), 2406 FnTy->arg_type_begin(), 2407 FnTy->getNumArgs(), EPI); 2408 } 2409 2410 // C++0x [dcl.fct]p6: 2411 // A ref-qualifier shall only be part of the function type for a 2412 // non-static member function, the function type to which a pointer to 2413 // member refers, or the top-level function type of a function typedef 2414 // declaration. 2415 if ((FnTy->getTypeQuals() != 0 || FnTy->getRefQualifier()) && 2416 !(D.getContext() == Declarator::TemplateTypeArgContext && 2417 !D.isFunctionDeclarator()) && !IsTypedefName && 2418 (FreeFunction || 2419 D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_static)) { 2420 if (D.getContext() == Declarator::TemplateTypeArgContext) { 2421 // Accept qualified function types as template type arguments as a GNU 2422 // extension. This is also the subject of C++ core issue 547. 2423 std::string Quals; 2424 if (FnTy->getTypeQuals() != 0) 2425 Quals = Qualifiers::fromCVRMask(FnTy->getTypeQuals()).getAsString(); 2426 2427 switch (FnTy->getRefQualifier()) { 2428 case RQ_None: 2429 break; 2430 2431 case RQ_LValue: 2432 if (!Quals.empty()) 2433 Quals += ' '; 2434 Quals += '&'; 2435 break; 2436 2437 case RQ_RValue: 2438 if (!Quals.empty()) 2439 Quals += ' '; 2440 Quals += "&&"; 2441 break; 2442 } 2443 2444 S.Diag(D.getIdentifierLoc(), 2445 diag::ext_qualified_function_type_template_arg) 2446 << Quals; 2447 } else { 2448 if (FnTy->getTypeQuals() != 0) { 2449 if (D.isFunctionDeclarator()) { 2450 SourceRange Range = D.getIdentifierLoc(); 2451 for (unsigned I = 0, N = D.getNumTypeObjects(); I != N; ++I) { 2452 const DeclaratorChunk &Chunk = D.getTypeObject(N-I-1); 2453 if (Chunk.Kind == DeclaratorChunk::Function && 2454 Chunk.Fun.TypeQuals != 0) { 2455 switch (Chunk.Fun.TypeQuals) { 2456 case Qualifiers::Const: 2457 Range = Chunk.Fun.getConstQualifierLoc(); 2458 break; 2459 case Qualifiers::Volatile: 2460 Range = Chunk.Fun.getVolatileQualifierLoc(); 2461 break; 2462 case Qualifiers::Const | Qualifiers::Volatile: { 2463 SourceLocation CLoc = Chunk.Fun.getConstQualifierLoc(); 2464 SourceLocation VLoc = Chunk.Fun.getVolatileQualifierLoc(); 2465 if (S.getSourceManager() 2466 .isBeforeInTranslationUnit(CLoc, VLoc)) { 2467 Range = SourceRange(CLoc, VLoc); 2468 } else { 2469 Range = SourceRange(VLoc, CLoc); 2470 } 2471 } 2472 break; 2473 } 2474 break; 2475 } 2476 } 2477 S.Diag(Range.getBegin(), diag::err_invalid_qualified_function_type) 2478 << FixItHint::CreateRemoval(Range); 2479 } else 2480 S.Diag(D.getIdentifierLoc(), 2481 diag::err_invalid_qualified_typedef_function_type_use) 2482 << FreeFunction; 2483 } 2484 2485 if (FnTy->getRefQualifier()) { 2486 if (D.isFunctionDeclarator()) { 2487 SourceLocation Loc = D.getIdentifierLoc(); 2488 for (unsigned I = 0, N = D.getNumTypeObjects(); I != N; ++I) { 2489 const DeclaratorChunk &Chunk = D.getTypeObject(N-I-1); 2490 if (Chunk.Kind == DeclaratorChunk::Function && 2491 Chunk.Fun.hasRefQualifier()) { 2492 Loc = Chunk.Fun.getRefQualifierLoc(); 2493 break; 2494 } 2495 } 2496 2497 S.Diag(Loc, diag::err_invalid_ref_qualifier_function_type) 2498 << (FnTy->getRefQualifier() == RQ_LValue) 2499 << FixItHint::CreateRemoval(Loc); 2500 } else { 2501 S.Diag(D.getIdentifierLoc(), 2502 diag::err_invalid_ref_qualifier_typedef_function_type_use) 2503 << FreeFunction 2504 << (FnTy->getRefQualifier() == RQ_LValue); 2505 } 2506 } 2507 2508 // Strip the cv-qualifiers and ref-qualifiers from the type. 2509 FunctionProtoType::ExtProtoInfo EPI = FnTy->getExtProtoInfo(); 2510 EPI.TypeQuals = 0; 2511 EPI.RefQualifier = RQ_None; 2512 2513 T = Context.getFunctionType(FnTy->getResultType(), 2514 FnTy->arg_type_begin(), 2515 FnTy->getNumArgs(), EPI); 2516 } 2517 } 2518 } 2519 2520 // Apply any undistributed attributes from the declarator. 2521 if (!T.isNull()) 2522 if (AttributeList *attrs = D.getAttributes()) 2523 processTypeAttrs(state, T, false, attrs); 2524 2525 // Diagnose any ignored type attributes. 2526 if (!T.isNull()) state.diagnoseIgnoredTypeAttrs(T); 2527 2528 // C++0x [dcl.constexpr]p9: 2529 // A constexpr specifier used in an object declaration declares the object 2530 // as const. 2531 if (D.getDeclSpec().isConstexprSpecified() && T->isObjectType()) { 2532 T.addConst(); 2533 } 2534 2535 // If there was an ellipsis in the declarator, the declaration declares a 2536 // parameter pack whose type may be a pack expansion type. 2537 if (D.hasEllipsis() && !T.isNull()) { 2538 // C++0x [dcl.fct]p13: 2539 // A declarator-id or abstract-declarator containing an ellipsis shall 2540 // only be used in a parameter-declaration. Such a parameter-declaration 2541 // is a parameter pack (14.5.3). [...] 2542 switch (D.getContext()) { 2543 case Declarator::PrototypeContext: 2544 // C++0x [dcl.fct]p13: 2545 // [...] When it is part of a parameter-declaration-clause, the 2546 // parameter pack is a function parameter pack (14.5.3). The type T 2547 // of the declarator-id of the function parameter pack shall contain 2548 // a template parameter pack; each template parameter pack in T is 2549 // expanded by the function parameter pack. 2550 // 2551 // We represent function parameter packs as function parameters whose 2552 // type is a pack expansion. 2553 if (!T->containsUnexpandedParameterPack()) { 2554 S.Diag(D.getEllipsisLoc(), 2555 diag::err_function_parameter_pack_without_parameter_packs) 2556 << T << D.getSourceRange(); 2557 D.setEllipsisLoc(SourceLocation()); 2558 } else { 2559 T = Context.getPackExpansionType(T, llvm::Optional<unsigned>()); 2560 } 2561 break; 2562 2563 case Declarator::TemplateParamContext: 2564 // C++0x [temp.param]p15: 2565 // If a template-parameter is a [...] is a parameter-declaration that 2566 // declares a parameter pack (8.3.5), then the template-parameter is a 2567 // template parameter pack (14.5.3). 2568 // 2569 // Note: core issue 778 clarifies that, if there are any unexpanded 2570 // parameter packs in the type of the non-type template parameter, then 2571 // it expands those parameter packs. 2572 if (T->containsUnexpandedParameterPack()) 2573 T = Context.getPackExpansionType(T, llvm::Optional<unsigned>()); 2574 else 2575 S.Diag(D.getEllipsisLoc(), 2576 LangOpts.CPlusPlus0x 2577 ? diag::warn_cxx98_compat_variadic_templates 2578 : diag::ext_variadic_templates); 2579 break; 2580 2581 case Declarator::FileContext: 2582 case Declarator::KNRTypeListContext: 2583 case Declarator::ObjCParameterContext: // FIXME: special diagnostic here? 2584 case Declarator::ObjCResultContext: // FIXME: special diagnostic here? 2585 case Declarator::TypeNameContext: 2586 case Declarator::CXXNewContext: 2587 case Declarator::AliasDeclContext: 2588 case Declarator::AliasTemplateContext: 2589 case Declarator::MemberContext: 2590 case Declarator::BlockContext: 2591 case Declarator::ForContext: 2592 case Declarator::ConditionContext: 2593 case Declarator::CXXCatchContext: 2594 case Declarator::ObjCCatchContext: 2595 case Declarator::BlockLiteralContext: 2596 case Declarator::LambdaExprContext: 2597 case Declarator::TemplateTypeArgContext: 2598 // FIXME: We may want to allow parameter packs in block-literal contexts 2599 // in the future. 2600 S.Diag(D.getEllipsisLoc(), diag::err_ellipsis_in_declarator_not_parameter); 2601 D.setEllipsisLoc(SourceLocation()); 2602 break; 2603 } 2604 } 2605 2606 if (T.isNull()) 2607 return Context.getNullTypeSourceInfo(); 2608 else if (D.isInvalidType()) 2609 return Context.getTrivialTypeSourceInfo(T); 2610 2611 return S.GetTypeSourceInfoForDeclarator(D, T, TInfo); 2612} 2613 2614/// GetTypeForDeclarator - Convert the type for the specified 2615/// declarator to Type instances. 2616/// 2617/// The result of this call will never be null, but the associated 2618/// type may be a null type if there's an unrecoverable error. 2619TypeSourceInfo *Sema::GetTypeForDeclarator(Declarator &D, Scope *S) { 2620 // Determine the type of the declarator. Not all forms of declarator 2621 // have a type. 2622 2623 TypeProcessingState state(*this, D); 2624 2625 TypeSourceInfo *ReturnTypeInfo = 0; 2626 QualType T = GetDeclSpecTypeForDeclarator(state, ReturnTypeInfo); 2627 if (T.isNull()) 2628 return Context.getNullTypeSourceInfo(); 2629 2630 if (D.isPrototypeContext() && getLangOptions().ObjCAutoRefCount) 2631 inferARCWriteback(state, T); 2632 2633 return GetFullTypeForDeclarator(state, T, ReturnTypeInfo); 2634} 2635 2636static void transferARCOwnershipToDeclSpec(Sema &S, 2637 QualType &declSpecTy, 2638 Qualifiers::ObjCLifetime ownership) { 2639 if (declSpecTy->isObjCRetainableType() && 2640 declSpecTy.getObjCLifetime() == Qualifiers::OCL_None) { 2641 Qualifiers qs; 2642 qs.addObjCLifetime(ownership); 2643 declSpecTy = S.Context.getQualifiedType(declSpecTy, qs); 2644 } 2645} 2646 2647static void transferARCOwnershipToDeclaratorChunk(TypeProcessingState &state, 2648 Qualifiers::ObjCLifetime ownership, 2649 unsigned chunkIndex) { 2650 Sema &S = state.getSema(); 2651 Declarator &D = state.getDeclarator(); 2652 2653 // Look for an explicit lifetime attribute. 2654 DeclaratorChunk &chunk = D.getTypeObject(chunkIndex); 2655 for (const AttributeList *attr = chunk.getAttrs(); attr; 2656 attr = attr->getNext()) 2657 if (attr->getKind() == AttributeList::AT_objc_ownership) 2658 return; 2659 2660 const char *attrStr = 0; 2661 switch (ownership) { 2662 case Qualifiers::OCL_None: llvm_unreachable("no ownership!"); break; 2663 case Qualifiers::OCL_ExplicitNone: attrStr = "none"; break; 2664 case Qualifiers::OCL_Strong: attrStr = "strong"; break; 2665 case Qualifiers::OCL_Weak: attrStr = "weak"; break; 2666 case Qualifiers::OCL_Autoreleasing: attrStr = "autoreleasing"; break; 2667 } 2668 2669 // If there wasn't one, add one (with an invalid source location 2670 // so that we don't make an AttributedType for it). 2671 AttributeList *attr = D.getAttributePool() 2672 .create(&S.Context.Idents.get("objc_ownership"), SourceLocation(), 2673 /*scope*/ 0, SourceLocation(), 2674 &S.Context.Idents.get(attrStr), SourceLocation(), 2675 /*args*/ 0, 0, 2676 /*declspec*/ false, /*C++0x*/ false); 2677 spliceAttrIntoList(*attr, chunk.getAttrListRef()); 2678 2679 // TODO: mark whether we did this inference? 2680} 2681 2682/// \brief Used for transfering ownership in casts resulting in l-values. 2683static void transferARCOwnership(TypeProcessingState &state, 2684 QualType &declSpecTy, 2685 Qualifiers::ObjCLifetime ownership) { 2686 Sema &S = state.getSema(); 2687 Declarator &D = state.getDeclarator(); 2688 2689 int inner = -1; 2690 bool hasIndirection = false; 2691 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 2692 DeclaratorChunk &chunk = D.getTypeObject(i); 2693 switch (chunk.Kind) { 2694 case DeclaratorChunk::Paren: 2695 // Ignore parens. 2696 break; 2697 2698 case DeclaratorChunk::Array: 2699 case DeclaratorChunk::Reference: 2700 case DeclaratorChunk::Pointer: 2701 if (inner != -1) 2702 hasIndirection = true; 2703 inner = i; 2704 break; 2705 2706 case DeclaratorChunk::BlockPointer: 2707 if (inner != -1) 2708 transferARCOwnershipToDeclaratorChunk(state, ownership, i); 2709 return; 2710 2711 case DeclaratorChunk::Function: 2712 case DeclaratorChunk::MemberPointer: 2713 return; 2714 } 2715 } 2716 2717 if (inner == -1) 2718 return; 2719 2720 DeclaratorChunk &chunk = D.getTypeObject(inner); 2721 if (chunk.Kind == DeclaratorChunk::Pointer) { 2722 if (declSpecTy->isObjCRetainableType()) 2723 return transferARCOwnershipToDeclSpec(S, declSpecTy, ownership); 2724 if (declSpecTy->isObjCObjectType() && hasIndirection) 2725 return transferARCOwnershipToDeclaratorChunk(state, ownership, inner); 2726 } else { 2727 assert(chunk.Kind == DeclaratorChunk::Array || 2728 chunk.Kind == DeclaratorChunk::Reference); 2729 return transferARCOwnershipToDeclSpec(S, declSpecTy, ownership); 2730 } 2731} 2732 2733TypeSourceInfo *Sema::GetTypeForDeclaratorCast(Declarator &D, QualType FromTy) { 2734 TypeProcessingState state(*this, D); 2735 2736 TypeSourceInfo *ReturnTypeInfo = 0; 2737 QualType declSpecTy = GetDeclSpecTypeForDeclarator(state, ReturnTypeInfo); 2738 if (declSpecTy.isNull()) 2739 return Context.getNullTypeSourceInfo(); 2740 2741 if (getLangOptions().ObjCAutoRefCount) { 2742 Qualifiers::ObjCLifetime ownership = Context.getInnerObjCOwnership(FromTy); 2743 if (ownership != Qualifiers::OCL_None) 2744 transferARCOwnership(state, declSpecTy, ownership); 2745 } 2746 2747 return GetFullTypeForDeclarator(state, declSpecTy, ReturnTypeInfo); 2748} 2749 2750/// Map an AttributedType::Kind to an AttributeList::Kind. 2751static AttributeList::Kind getAttrListKind(AttributedType::Kind kind) { 2752 switch (kind) { 2753 case AttributedType::attr_address_space: 2754 return AttributeList::AT_address_space; 2755 case AttributedType::attr_regparm: 2756 return AttributeList::AT_regparm; 2757 case AttributedType::attr_vector_size: 2758 return AttributeList::AT_vector_size; 2759 case AttributedType::attr_neon_vector_type: 2760 return AttributeList::AT_neon_vector_type; 2761 case AttributedType::attr_neon_polyvector_type: 2762 return AttributeList::AT_neon_polyvector_type; 2763 case AttributedType::attr_objc_gc: 2764 return AttributeList::AT_objc_gc; 2765 case AttributedType::attr_objc_ownership: 2766 return AttributeList::AT_objc_ownership; 2767 case AttributedType::attr_noreturn: 2768 return AttributeList::AT_noreturn; 2769 case AttributedType::attr_cdecl: 2770 return AttributeList::AT_cdecl; 2771 case AttributedType::attr_fastcall: 2772 return AttributeList::AT_fastcall; 2773 case AttributedType::attr_stdcall: 2774 return AttributeList::AT_stdcall; 2775 case AttributedType::attr_thiscall: 2776 return AttributeList::AT_thiscall; 2777 case AttributedType::attr_pascal: 2778 return AttributeList::AT_pascal; 2779 case AttributedType::attr_pcs: 2780 return AttributeList::AT_pcs; 2781 } 2782 llvm_unreachable("unexpected attribute kind!"); 2783 return AttributeList::Kind(); 2784} 2785 2786static void fillAttributedTypeLoc(AttributedTypeLoc TL, 2787 const AttributeList *attrs) { 2788 AttributedType::Kind kind = TL.getAttrKind(); 2789 2790 assert(attrs && "no type attributes in the expected location!"); 2791 AttributeList::Kind parsedKind = getAttrListKind(kind); 2792 while (attrs->getKind() != parsedKind) { 2793 attrs = attrs->getNext(); 2794 assert(attrs && "no matching attribute in expected location!"); 2795 } 2796 2797 TL.setAttrNameLoc(attrs->getLoc()); 2798 if (TL.hasAttrExprOperand()) 2799 TL.setAttrExprOperand(attrs->getArg(0)); 2800 else if (TL.hasAttrEnumOperand()) 2801 TL.setAttrEnumOperandLoc(attrs->getParameterLoc()); 2802 2803 // FIXME: preserve this information to here. 2804 if (TL.hasAttrOperand()) 2805 TL.setAttrOperandParensRange(SourceRange()); 2806} 2807 2808namespace { 2809 class TypeSpecLocFiller : public TypeLocVisitor<TypeSpecLocFiller> { 2810 ASTContext &Context; 2811 const DeclSpec &DS; 2812 2813 public: 2814 TypeSpecLocFiller(ASTContext &Context, const DeclSpec &DS) 2815 : Context(Context), DS(DS) {} 2816 2817 void VisitAttributedTypeLoc(AttributedTypeLoc TL) { 2818 fillAttributedTypeLoc(TL, DS.getAttributes().getList()); 2819 Visit(TL.getModifiedLoc()); 2820 } 2821 void VisitQualifiedTypeLoc(QualifiedTypeLoc TL) { 2822 Visit(TL.getUnqualifiedLoc()); 2823 } 2824 void VisitTypedefTypeLoc(TypedefTypeLoc TL) { 2825 TL.setNameLoc(DS.getTypeSpecTypeLoc()); 2826 } 2827 void VisitObjCInterfaceTypeLoc(ObjCInterfaceTypeLoc TL) { 2828 TL.setNameLoc(DS.getTypeSpecTypeLoc()); 2829 } 2830 void VisitObjCObjectTypeLoc(ObjCObjectTypeLoc TL) { 2831 // Handle the base type, which might not have been written explicitly. 2832 if (DS.getTypeSpecType() == DeclSpec::TST_unspecified) { 2833 TL.setHasBaseTypeAsWritten(false); 2834 TL.getBaseLoc().initialize(Context, SourceLocation()); 2835 } else { 2836 TL.setHasBaseTypeAsWritten(true); 2837 Visit(TL.getBaseLoc()); 2838 } 2839 2840 // Protocol qualifiers. 2841 if (DS.getProtocolQualifiers()) { 2842 assert(TL.getNumProtocols() > 0); 2843 assert(TL.getNumProtocols() == DS.getNumProtocolQualifiers()); 2844 TL.setLAngleLoc(DS.getProtocolLAngleLoc()); 2845 TL.setRAngleLoc(DS.getSourceRange().getEnd()); 2846 for (unsigned i = 0, e = DS.getNumProtocolQualifiers(); i != e; ++i) 2847 TL.setProtocolLoc(i, DS.getProtocolLocs()[i]); 2848 } else { 2849 assert(TL.getNumProtocols() == 0); 2850 TL.setLAngleLoc(SourceLocation()); 2851 TL.setRAngleLoc(SourceLocation()); 2852 } 2853 } 2854 void VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL) { 2855 TL.setStarLoc(SourceLocation()); 2856 Visit(TL.getPointeeLoc()); 2857 } 2858 void VisitTemplateSpecializationTypeLoc(TemplateSpecializationTypeLoc TL) { 2859 TypeSourceInfo *TInfo = 0; 2860 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 2861 2862 // If we got no declarator info from previous Sema routines, 2863 // just fill with the typespec loc. 2864 if (!TInfo) { 2865 TL.initialize(Context, DS.getTypeSpecTypeNameLoc()); 2866 return; 2867 } 2868 2869 TypeLoc OldTL = TInfo->getTypeLoc(); 2870 if (TInfo->getType()->getAs<ElaboratedType>()) { 2871 ElaboratedTypeLoc ElabTL = cast<ElaboratedTypeLoc>(OldTL); 2872 TemplateSpecializationTypeLoc NamedTL = 2873 cast<TemplateSpecializationTypeLoc>(ElabTL.getNamedTypeLoc()); 2874 TL.copy(NamedTL); 2875 } 2876 else 2877 TL.copy(cast<TemplateSpecializationTypeLoc>(OldTL)); 2878 } 2879 void VisitTypeOfExprTypeLoc(TypeOfExprTypeLoc TL) { 2880 assert(DS.getTypeSpecType() == DeclSpec::TST_typeofExpr); 2881 TL.setTypeofLoc(DS.getTypeSpecTypeLoc()); 2882 TL.setParensRange(DS.getTypeofParensRange()); 2883 } 2884 void VisitTypeOfTypeLoc(TypeOfTypeLoc TL) { 2885 assert(DS.getTypeSpecType() == DeclSpec::TST_typeofType); 2886 TL.setTypeofLoc(DS.getTypeSpecTypeLoc()); 2887 TL.setParensRange(DS.getTypeofParensRange()); 2888 assert(DS.getRepAsType()); 2889 TypeSourceInfo *TInfo = 0; 2890 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 2891 TL.setUnderlyingTInfo(TInfo); 2892 } 2893 void VisitUnaryTransformTypeLoc(UnaryTransformTypeLoc TL) { 2894 // FIXME: This holds only because we only have one unary transform. 2895 assert(DS.getTypeSpecType() == DeclSpec::TST_underlyingType); 2896 TL.setKWLoc(DS.getTypeSpecTypeLoc()); 2897 TL.setParensRange(DS.getTypeofParensRange()); 2898 assert(DS.getRepAsType()); 2899 TypeSourceInfo *TInfo = 0; 2900 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 2901 TL.setUnderlyingTInfo(TInfo); 2902 } 2903 void VisitBuiltinTypeLoc(BuiltinTypeLoc TL) { 2904 // By default, use the source location of the type specifier. 2905 TL.setBuiltinLoc(DS.getTypeSpecTypeLoc()); 2906 if (TL.needsExtraLocalData()) { 2907 // Set info for the written builtin specifiers. 2908 TL.getWrittenBuiltinSpecs() = DS.getWrittenBuiltinSpecs(); 2909 // Try to have a meaningful source location. 2910 if (TL.getWrittenSignSpec() != TSS_unspecified) 2911 // Sign spec loc overrides the others (e.g., 'unsigned long'). 2912 TL.setBuiltinLoc(DS.getTypeSpecSignLoc()); 2913 else if (TL.getWrittenWidthSpec() != TSW_unspecified) 2914 // Width spec loc overrides type spec loc (e.g., 'short int'). 2915 TL.setBuiltinLoc(DS.getTypeSpecWidthLoc()); 2916 } 2917 } 2918 void VisitElaboratedTypeLoc(ElaboratedTypeLoc TL) { 2919 ElaboratedTypeKeyword Keyword 2920 = TypeWithKeyword::getKeywordForTypeSpec(DS.getTypeSpecType()); 2921 if (DS.getTypeSpecType() == TST_typename) { 2922 TypeSourceInfo *TInfo = 0; 2923 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 2924 if (TInfo) { 2925 TL.copy(cast<ElaboratedTypeLoc>(TInfo->getTypeLoc())); 2926 return; 2927 } 2928 } 2929 TL.setKeywordLoc(Keyword != ETK_None 2930 ? DS.getTypeSpecTypeLoc() 2931 : SourceLocation()); 2932 const CXXScopeSpec& SS = DS.getTypeSpecScope(); 2933 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 2934 Visit(TL.getNextTypeLoc().getUnqualifiedLoc()); 2935 } 2936 void VisitDependentNameTypeLoc(DependentNameTypeLoc TL) { 2937 ElaboratedTypeKeyword Keyword 2938 = TypeWithKeyword::getKeywordForTypeSpec(DS.getTypeSpecType()); 2939 if (DS.getTypeSpecType() == TST_typename) { 2940 TypeSourceInfo *TInfo = 0; 2941 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 2942 if (TInfo) { 2943 TL.copy(cast<DependentNameTypeLoc>(TInfo->getTypeLoc())); 2944 return; 2945 } 2946 } 2947 TL.setKeywordLoc(Keyword != ETK_None 2948 ? DS.getTypeSpecTypeLoc() 2949 : SourceLocation()); 2950 const CXXScopeSpec& SS = DS.getTypeSpecScope(); 2951 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 2952 TL.setNameLoc(DS.getTypeSpecTypeNameLoc()); 2953 } 2954 void VisitDependentTemplateSpecializationTypeLoc( 2955 DependentTemplateSpecializationTypeLoc TL) { 2956 ElaboratedTypeKeyword Keyword 2957 = TypeWithKeyword::getKeywordForTypeSpec(DS.getTypeSpecType()); 2958 if (Keyword == ETK_Typename) { 2959 TypeSourceInfo *TInfo = 0; 2960 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 2961 if (TInfo) { 2962 TL.copy(cast<DependentTemplateSpecializationTypeLoc>( 2963 TInfo->getTypeLoc())); 2964 return; 2965 } 2966 } 2967 TL.initializeLocal(Context, SourceLocation()); 2968 TL.setKeywordLoc(Keyword != ETK_None 2969 ? DS.getTypeSpecTypeLoc() 2970 : SourceLocation()); 2971 const CXXScopeSpec& SS = DS.getTypeSpecScope(); 2972 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 2973 TL.setNameLoc(DS.getTypeSpecTypeNameLoc()); 2974 } 2975 void VisitTagTypeLoc(TagTypeLoc TL) { 2976 TL.setNameLoc(DS.getTypeSpecTypeNameLoc()); 2977 } 2978 void VisitAtomicTypeLoc(AtomicTypeLoc TL) { 2979 TL.setKWLoc(DS.getTypeSpecTypeLoc()); 2980 TL.setParensRange(DS.getTypeofParensRange()); 2981 2982 TypeSourceInfo *TInfo = 0; 2983 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 2984 TL.getValueLoc().initializeFullCopy(TInfo->getTypeLoc()); 2985 } 2986 2987 void VisitTypeLoc(TypeLoc TL) { 2988 // FIXME: add other typespec types and change this to an assert. 2989 TL.initialize(Context, DS.getTypeSpecTypeLoc()); 2990 } 2991 }; 2992 2993 class DeclaratorLocFiller : public TypeLocVisitor<DeclaratorLocFiller> { 2994 ASTContext &Context; 2995 const DeclaratorChunk &Chunk; 2996 2997 public: 2998 DeclaratorLocFiller(ASTContext &Context, const DeclaratorChunk &Chunk) 2999 : Context(Context), Chunk(Chunk) {} 3000 3001 void VisitQualifiedTypeLoc(QualifiedTypeLoc TL) { 3002 llvm_unreachable("qualified type locs not expected here!"); 3003 } 3004 3005 void VisitAttributedTypeLoc(AttributedTypeLoc TL) { 3006 fillAttributedTypeLoc(TL, Chunk.getAttrs()); 3007 } 3008 void VisitBlockPointerTypeLoc(BlockPointerTypeLoc TL) { 3009 assert(Chunk.Kind == DeclaratorChunk::BlockPointer); 3010 TL.setCaretLoc(Chunk.Loc); 3011 } 3012 void VisitPointerTypeLoc(PointerTypeLoc TL) { 3013 assert(Chunk.Kind == DeclaratorChunk::Pointer); 3014 TL.setStarLoc(Chunk.Loc); 3015 } 3016 void VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL) { 3017 assert(Chunk.Kind == DeclaratorChunk::Pointer); 3018 TL.setStarLoc(Chunk.Loc); 3019 } 3020 void VisitMemberPointerTypeLoc(MemberPointerTypeLoc TL) { 3021 assert(Chunk.Kind == DeclaratorChunk::MemberPointer); 3022 const CXXScopeSpec& SS = Chunk.Mem.Scope(); 3023 NestedNameSpecifierLoc NNSLoc = SS.getWithLocInContext(Context); 3024 3025 const Type* ClsTy = TL.getClass(); 3026 QualType ClsQT = QualType(ClsTy, 0); 3027 TypeSourceInfo *ClsTInfo = Context.CreateTypeSourceInfo(ClsQT, 0); 3028 // Now copy source location info into the type loc component. 3029 TypeLoc ClsTL = ClsTInfo->getTypeLoc(); 3030 switch (NNSLoc.getNestedNameSpecifier()->getKind()) { 3031 case NestedNameSpecifier::Identifier: 3032 assert(isa<DependentNameType>(ClsTy) && "Unexpected TypeLoc"); 3033 { 3034 DependentNameTypeLoc DNTLoc = cast<DependentNameTypeLoc>(ClsTL); 3035 DNTLoc.setKeywordLoc(SourceLocation()); 3036 DNTLoc.setQualifierLoc(NNSLoc.getPrefix()); 3037 DNTLoc.setNameLoc(NNSLoc.getLocalBeginLoc()); 3038 } 3039 break; 3040 3041 case NestedNameSpecifier::TypeSpec: 3042 case NestedNameSpecifier::TypeSpecWithTemplate: 3043 if (isa<ElaboratedType>(ClsTy)) { 3044 ElaboratedTypeLoc ETLoc = *cast<ElaboratedTypeLoc>(&ClsTL); 3045 ETLoc.setKeywordLoc(SourceLocation()); 3046 ETLoc.setQualifierLoc(NNSLoc.getPrefix()); 3047 TypeLoc NamedTL = ETLoc.getNamedTypeLoc(); 3048 NamedTL.initializeFullCopy(NNSLoc.getTypeLoc()); 3049 } else { 3050 ClsTL.initializeFullCopy(NNSLoc.getTypeLoc()); 3051 } 3052 break; 3053 3054 case NestedNameSpecifier::Namespace: 3055 case NestedNameSpecifier::NamespaceAlias: 3056 case NestedNameSpecifier::Global: 3057 llvm_unreachable("Nested-name-specifier must name a type"); 3058 break; 3059 } 3060 3061 // Finally fill in MemberPointerLocInfo fields. 3062 TL.setStarLoc(Chunk.Loc); 3063 TL.setClassTInfo(ClsTInfo); 3064 } 3065 void VisitLValueReferenceTypeLoc(LValueReferenceTypeLoc TL) { 3066 assert(Chunk.Kind == DeclaratorChunk::Reference); 3067 // 'Amp' is misleading: this might have been originally 3068 /// spelled with AmpAmp. 3069 TL.setAmpLoc(Chunk.Loc); 3070 } 3071 void VisitRValueReferenceTypeLoc(RValueReferenceTypeLoc TL) { 3072 assert(Chunk.Kind == DeclaratorChunk::Reference); 3073 assert(!Chunk.Ref.LValueRef); 3074 TL.setAmpAmpLoc(Chunk.Loc); 3075 } 3076 void VisitArrayTypeLoc(ArrayTypeLoc TL) { 3077 assert(Chunk.Kind == DeclaratorChunk::Array); 3078 TL.setLBracketLoc(Chunk.Loc); 3079 TL.setRBracketLoc(Chunk.EndLoc); 3080 TL.setSizeExpr(static_cast<Expr*>(Chunk.Arr.NumElts)); 3081 } 3082 void VisitFunctionTypeLoc(FunctionTypeLoc TL) { 3083 assert(Chunk.Kind == DeclaratorChunk::Function); 3084 TL.setLocalRangeBegin(Chunk.Loc); 3085 TL.setLocalRangeEnd(Chunk.EndLoc); 3086 TL.setTrailingReturn(!!Chunk.Fun.TrailingReturnType); 3087 3088 const DeclaratorChunk::FunctionTypeInfo &FTI = Chunk.Fun; 3089 for (unsigned i = 0, e = TL.getNumArgs(), tpi = 0; i != e; ++i) { 3090 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 3091 TL.setArg(tpi++, Param); 3092 } 3093 // FIXME: exception specs 3094 } 3095 void VisitParenTypeLoc(ParenTypeLoc TL) { 3096 assert(Chunk.Kind == DeclaratorChunk::Paren); 3097 TL.setLParenLoc(Chunk.Loc); 3098 TL.setRParenLoc(Chunk.EndLoc); 3099 } 3100 3101 void VisitTypeLoc(TypeLoc TL) { 3102 llvm_unreachable("unsupported TypeLoc kind in declarator!"); 3103 } 3104 }; 3105} 3106 3107/// \brief Create and instantiate a TypeSourceInfo with type source information. 3108/// 3109/// \param T QualType referring to the type as written in source code. 3110/// 3111/// \param ReturnTypeInfo For declarators whose return type does not show 3112/// up in the normal place in the declaration specifiers (such as a C++ 3113/// conversion function), this pointer will refer to a type source information 3114/// for that return type. 3115TypeSourceInfo * 3116Sema::GetTypeSourceInfoForDeclarator(Declarator &D, QualType T, 3117 TypeSourceInfo *ReturnTypeInfo) { 3118 TypeSourceInfo *TInfo = Context.CreateTypeSourceInfo(T); 3119 UnqualTypeLoc CurrTL = TInfo->getTypeLoc().getUnqualifiedLoc(); 3120 3121 // Handle parameter packs whose type is a pack expansion. 3122 if (isa<PackExpansionType>(T)) { 3123 cast<PackExpansionTypeLoc>(CurrTL).setEllipsisLoc(D.getEllipsisLoc()); 3124 CurrTL = CurrTL.getNextTypeLoc().getUnqualifiedLoc(); 3125 } 3126 3127 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 3128 while (isa<AttributedTypeLoc>(CurrTL)) { 3129 AttributedTypeLoc TL = cast<AttributedTypeLoc>(CurrTL); 3130 fillAttributedTypeLoc(TL, D.getTypeObject(i).getAttrs()); 3131 CurrTL = TL.getNextTypeLoc().getUnqualifiedLoc(); 3132 } 3133 3134 DeclaratorLocFiller(Context, D.getTypeObject(i)).Visit(CurrTL); 3135 CurrTL = CurrTL.getNextTypeLoc().getUnqualifiedLoc(); 3136 } 3137 3138 // If we have different source information for the return type, use 3139 // that. This really only applies to C++ conversion functions. 3140 if (ReturnTypeInfo) { 3141 TypeLoc TL = ReturnTypeInfo->getTypeLoc(); 3142 assert(TL.getFullDataSize() == CurrTL.getFullDataSize()); 3143 memcpy(CurrTL.getOpaqueData(), TL.getOpaqueData(), TL.getFullDataSize()); 3144 } else { 3145 TypeSpecLocFiller(Context, D.getDeclSpec()).Visit(CurrTL); 3146 } 3147 3148 return TInfo; 3149} 3150 3151/// \brief Create a LocInfoType to hold the given QualType and TypeSourceInfo. 3152ParsedType Sema::CreateParsedType(QualType T, TypeSourceInfo *TInfo) { 3153 // FIXME: LocInfoTypes are "transient", only needed for passing to/from Parser 3154 // and Sema during declaration parsing. Try deallocating/caching them when 3155 // it's appropriate, instead of allocating them and keeping them around. 3156 LocInfoType *LocT = (LocInfoType*)BumpAlloc.Allocate(sizeof(LocInfoType), 3157 TypeAlignment); 3158 new (LocT) LocInfoType(T, TInfo); 3159 assert(LocT->getTypeClass() != T->getTypeClass() && 3160 "LocInfoType's TypeClass conflicts with an existing Type class"); 3161 return ParsedType::make(QualType(LocT, 0)); 3162} 3163 3164void LocInfoType::getAsStringInternal(std::string &Str, 3165 const PrintingPolicy &Policy) const { 3166 llvm_unreachable("LocInfoType leaked into the type system; an opaque TypeTy*" 3167 " was used directly instead of getting the QualType through" 3168 " GetTypeFromParser"); 3169} 3170 3171TypeResult Sema::ActOnTypeName(Scope *S, Declarator &D) { 3172 // C99 6.7.6: Type names have no identifier. This is already validated by 3173 // the parser. 3174 assert(D.getIdentifier() == 0 && "Type name should have no identifier!"); 3175 3176 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 3177 QualType T = TInfo->getType(); 3178 if (D.isInvalidType()) 3179 return true; 3180 3181 // Make sure there are no unused decl attributes on the declarator. 3182 // We don't want to do this for ObjC parameters because we're going 3183 // to apply them to the actual parameter declaration. 3184 if (D.getContext() != Declarator::ObjCParameterContext) 3185 checkUnusedDeclAttributes(D); 3186 3187 if (getLangOptions().CPlusPlus) { 3188 // Check that there are no default arguments (C++ only). 3189 CheckExtraCXXDefaultArguments(D); 3190 } 3191 3192 return CreateParsedType(T, TInfo); 3193} 3194 3195ParsedType Sema::ActOnObjCInstanceType(SourceLocation Loc) { 3196 QualType T = Context.getObjCInstanceType(); 3197 TypeSourceInfo *TInfo = Context.getTrivialTypeSourceInfo(T, Loc); 3198 return CreateParsedType(T, TInfo); 3199} 3200 3201 3202//===----------------------------------------------------------------------===// 3203// Type Attribute Processing 3204//===----------------------------------------------------------------------===// 3205 3206/// HandleAddressSpaceTypeAttribute - Process an address_space attribute on the 3207/// specified type. The attribute contains 1 argument, the id of the address 3208/// space for the type. 3209static void HandleAddressSpaceTypeAttribute(QualType &Type, 3210 const AttributeList &Attr, Sema &S){ 3211 3212 // If this type is already address space qualified, reject it. 3213 // ISO/IEC TR 18037 S5.3 (amending C99 6.7.3): "No type shall be qualified by 3214 // qualifiers for two or more different address spaces." 3215 if (Type.getAddressSpace()) { 3216 S.Diag(Attr.getLoc(), diag::err_attribute_address_multiple_qualifiers); 3217 Attr.setInvalid(); 3218 return; 3219 } 3220 3221 // ISO/IEC TR 18037 S5.3 (amending C99 6.7.3): "A function type shall not be 3222 // qualified by an address-space qualifier." 3223 if (Type->isFunctionType()) { 3224 S.Diag(Attr.getLoc(), diag::err_attribute_address_function_type); 3225 Attr.setInvalid(); 3226 return; 3227 } 3228 3229 // Check the attribute arguments. 3230 if (Attr.getNumArgs() != 1) { 3231 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 3232 Attr.setInvalid(); 3233 return; 3234 } 3235 Expr *ASArgExpr = static_cast<Expr *>(Attr.getArg(0)); 3236 llvm::APSInt addrSpace(32); 3237 if (ASArgExpr->isTypeDependent() || ASArgExpr->isValueDependent() || 3238 !ASArgExpr->isIntegerConstantExpr(addrSpace, S.Context)) { 3239 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_not_int) 3240 << ASArgExpr->getSourceRange(); 3241 Attr.setInvalid(); 3242 return; 3243 } 3244 3245 // Bounds checking. 3246 if (addrSpace.isSigned()) { 3247 if (addrSpace.isNegative()) { 3248 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_negative) 3249 << ASArgExpr->getSourceRange(); 3250 Attr.setInvalid(); 3251 return; 3252 } 3253 addrSpace.setIsSigned(false); 3254 } 3255 llvm::APSInt max(addrSpace.getBitWidth()); 3256 max = Qualifiers::MaxAddressSpace; 3257 if (addrSpace > max) { 3258 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_too_high) 3259 << Qualifiers::MaxAddressSpace << ASArgExpr->getSourceRange(); 3260 Attr.setInvalid(); 3261 return; 3262 } 3263 3264 unsigned ASIdx = static_cast<unsigned>(addrSpace.getZExtValue()); 3265 Type = S.Context.getAddrSpaceQualType(Type, ASIdx); 3266} 3267 3268/// handleObjCOwnershipTypeAttr - Process an objc_ownership 3269/// attribute on the specified type. 3270/// 3271/// Returns 'true' if the attribute was handled. 3272static bool handleObjCOwnershipTypeAttr(TypeProcessingState &state, 3273 AttributeList &attr, 3274 QualType &type) { 3275 bool NonObjCPointer = false; 3276 3277 if (!type->isDependentType()) { 3278 if (const PointerType *ptr = type->getAs<PointerType>()) { 3279 QualType pointee = ptr->getPointeeType(); 3280 if (pointee->isObjCRetainableType() || pointee->isPointerType()) 3281 return false; 3282 // It is important not to lose the source info that there was an attribute 3283 // applied to non-objc pointer. We will create an attributed type but 3284 // its type will be the same as the original type. 3285 NonObjCPointer = true; 3286 } else if (!type->isObjCRetainableType()) { 3287 return false; 3288 } 3289 } 3290 3291 Sema &S = state.getSema(); 3292 SourceLocation AttrLoc = attr.getLoc(); 3293 if (AttrLoc.isMacroID()) 3294 AttrLoc = S.getSourceManager().getImmediateExpansionRange(AttrLoc).first; 3295 3296 if (type.getQualifiers().getObjCLifetime()) { 3297 S.Diag(AttrLoc, diag::err_attr_objc_ownership_redundant) 3298 << type; 3299 return true; 3300 } 3301 3302 if (!attr.getParameterName()) { 3303 S.Diag(AttrLoc, diag::err_attribute_argument_n_not_string) 3304 << "objc_ownership" << 1; 3305 attr.setInvalid(); 3306 return true; 3307 } 3308 3309 Qualifiers::ObjCLifetime lifetime; 3310 if (attr.getParameterName()->isStr("none")) 3311 lifetime = Qualifiers::OCL_ExplicitNone; 3312 else if (attr.getParameterName()->isStr("strong")) 3313 lifetime = Qualifiers::OCL_Strong; 3314 else if (attr.getParameterName()->isStr("weak")) 3315 lifetime = Qualifiers::OCL_Weak; 3316 else if (attr.getParameterName()->isStr("autoreleasing")) 3317 lifetime = Qualifiers::OCL_Autoreleasing; 3318 else { 3319 S.Diag(AttrLoc, diag::warn_attribute_type_not_supported) 3320 << "objc_ownership" << attr.getParameterName(); 3321 attr.setInvalid(); 3322 return true; 3323 } 3324 3325 // Consume lifetime attributes without further comment outside of 3326 // ARC mode. 3327 if (!S.getLangOptions().ObjCAutoRefCount) 3328 return true; 3329 3330 if (NonObjCPointer) { 3331 StringRef name = attr.getName()->getName(); 3332 switch (lifetime) { 3333 case Qualifiers::OCL_None: 3334 case Qualifiers::OCL_ExplicitNone: 3335 break; 3336 case Qualifiers::OCL_Strong: name = "__strong"; break; 3337 case Qualifiers::OCL_Weak: name = "__weak"; break; 3338 case Qualifiers::OCL_Autoreleasing: name = "__autoreleasing"; break; 3339 } 3340 S.Diag(AttrLoc, diag::warn_objc_object_attribute_wrong_type) 3341 << name << type; 3342 } 3343 3344 Qualifiers qs; 3345 qs.setObjCLifetime(lifetime); 3346 QualType origType = type; 3347 if (!NonObjCPointer) 3348 type = S.Context.getQualifiedType(type, qs); 3349 3350 // If we have a valid source location for the attribute, use an 3351 // AttributedType instead. 3352 if (AttrLoc.isValid()) 3353 type = S.Context.getAttributedType(AttributedType::attr_objc_ownership, 3354 origType, type); 3355 3356 // Forbid __weak if the runtime doesn't support it. 3357 if (lifetime == Qualifiers::OCL_Weak && 3358 !S.getLangOptions().ObjCRuntimeHasWeak && !NonObjCPointer) { 3359 3360 // Actually, delay this until we know what we're parsing. 3361 if (S.DelayedDiagnostics.shouldDelayDiagnostics()) { 3362 S.DelayedDiagnostics.add( 3363 sema::DelayedDiagnostic::makeForbiddenType( 3364 S.getSourceManager().getExpansionLoc(AttrLoc), 3365 diag::err_arc_weak_no_runtime, type, /*ignored*/ 0)); 3366 } else { 3367 S.Diag(AttrLoc, diag::err_arc_weak_no_runtime); 3368 } 3369 3370 attr.setInvalid(); 3371 return true; 3372 } 3373 3374 // Forbid __weak for class objects marked as 3375 // objc_arc_weak_reference_unavailable 3376 if (lifetime == Qualifiers::OCL_Weak) { 3377 QualType T = type; 3378 while (const PointerType *ptr = T->getAs<PointerType>()) 3379 T = ptr->getPointeeType(); 3380 if (const ObjCObjectPointerType *ObjT = T->getAs<ObjCObjectPointerType>()) { 3381 ObjCInterfaceDecl *Class = ObjT->getInterfaceDecl(); 3382 if (Class->isArcWeakrefUnavailable()) { 3383 S.Diag(AttrLoc, diag::err_arc_unsupported_weak_class); 3384 S.Diag(ObjT->getInterfaceDecl()->getLocation(), 3385 diag::note_class_declared); 3386 } 3387 } 3388 } 3389 3390 return true; 3391} 3392 3393/// handleObjCGCTypeAttr - Process the __attribute__((objc_gc)) type 3394/// attribute on the specified type. Returns true to indicate that 3395/// the attribute was handled, false to indicate that the type does 3396/// not permit the attribute. 3397static bool handleObjCGCTypeAttr(TypeProcessingState &state, 3398 AttributeList &attr, 3399 QualType &type) { 3400 Sema &S = state.getSema(); 3401 3402 // Delay if this isn't some kind of pointer. 3403 if (!type->isPointerType() && 3404 !type->isObjCObjectPointerType() && 3405 !type->isBlockPointerType()) 3406 return false; 3407 3408 if (type.getObjCGCAttr() != Qualifiers::GCNone) { 3409 S.Diag(attr.getLoc(), diag::err_attribute_multiple_objc_gc); 3410 attr.setInvalid(); 3411 return true; 3412 } 3413 3414 // Check the attribute arguments. 3415 if (!attr.getParameterName()) { 3416 S.Diag(attr.getLoc(), diag::err_attribute_argument_n_not_string) 3417 << "objc_gc" << 1; 3418 attr.setInvalid(); 3419 return true; 3420 } 3421 Qualifiers::GC GCAttr; 3422 if (attr.getNumArgs() != 0) { 3423 S.Diag(attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 3424 attr.setInvalid(); 3425 return true; 3426 } 3427 if (attr.getParameterName()->isStr("weak")) 3428 GCAttr = Qualifiers::Weak; 3429 else if (attr.getParameterName()->isStr("strong")) 3430 GCAttr = Qualifiers::Strong; 3431 else { 3432 S.Diag(attr.getLoc(), diag::warn_attribute_type_not_supported) 3433 << "objc_gc" << attr.getParameterName(); 3434 attr.setInvalid(); 3435 return true; 3436 } 3437 3438 QualType origType = type; 3439 type = S.Context.getObjCGCQualType(origType, GCAttr); 3440 3441 // Make an attributed type to preserve the source information. 3442 if (attr.getLoc().isValid()) 3443 type = S.Context.getAttributedType(AttributedType::attr_objc_gc, 3444 origType, type); 3445 3446 return true; 3447} 3448 3449namespace { 3450 /// A helper class to unwrap a type down to a function for the 3451 /// purposes of applying attributes there. 3452 /// 3453 /// Use: 3454 /// FunctionTypeUnwrapper unwrapped(SemaRef, T); 3455 /// if (unwrapped.isFunctionType()) { 3456 /// const FunctionType *fn = unwrapped.get(); 3457 /// // change fn somehow 3458 /// T = unwrapped.wrap(fn); 3459 /// } 3460 struct FunctionTypeUnwrapper { 3461 enum WrapKind { 3462 Desugar, 3463 Parens, 3464 Pointer, 3465 BlockPointer, 3466 Reference, 3467 MemberPointer 3468 }; 3469 3470 QualType Original; 3471 const FunctionType *Fn; 3472 SmallVector<unsigned char /*WrapKind*/, 8> Stack; 3473 3474 FunctionTypeUnwrapper(Sema &S, QualType T) : Original(T) { 3475 while (true) { 3476 const Type *Ty = T.getTypePtr(); 3477 if (isa<FunctionType>(Ty)) { 3478 Fn = cast<FunctionType>(Ty); 3479 return; 3480 } else if (isa<ParenType>(Ty)) { 3481 T = cast<ParenType>(Ty)->getInnerType(); 3482 Stack.push_back(Parens); 3483 } else if (isa<PointerType>(Ty)) { 3484 T = cast<PointerType>(Ty)->getPointeeType(); 3485 Stack.push_back(Pointer); 3486 } else if (isa<BlockPointerType>(Ty)) { 3487 T = cast<BlockPointerType>(Ty)->getPointeeType(); 3488 Stack.push_back(BlockPointer); 3489 } else if (isa<MemberPointerType>(Ty)) { 3490 T = cast<MemberPointerType>(Ty)->getPointeeType(); 3491 Stack.push_back(MemberPointer); 3492 } else if (isa<ReferenceType>(Ty)) { 3493 T = cast<ReferenceType>(Ty)->getPointeeType(); 3494 Stack.push_back(Reference); 3495 } else { 3496 const Type *DTy = Ty->getUnqualifiedDesugaredType(); 3497 if (Ty == DTy) { 3498 Fn = 0; 3499 return; 3500 } 3501 3502 T = QualType(DTy, 0); 3503 Stack.push_back(Desugar); 3504 } 3505 } 3506 } 3507 3508 bool isFunctionType() const { return (Fn != 0); } 3509 const FunctionType *get() const { return Fn; } 3510 3511 QualType wrap(Sema &S, const FunctionType *New) { 3512 // If T wasn't modified from the unwrapped type, do nothing. 3513 if (New == get()) return Original; 3514 3515 Fn = New; 3516 return wrap(S.Context, Original, 0); 3517 } 3518 3519 private: 3520 QualType wrap(ASTContext &C, QualType Old, unsigned I) { 3521 if (I == Stack.size()) 3522 return C.getQualifiedType(Fn, Old.getQualifiers()); 3523 3524 // Build up the inner type, applying the qualifiers from the old 3525 // type to the new type. 3526 SplitQualType SplitOld = Old.split(); 3527 3528 // As a special case, tail-recurse if there are no qualifiers. 3529 if (SplitOld.second.empty()) 3530 return wrap(C, SplitOld.first, I); 3531 return C.getQualifiedType(wrap(C, SplitOld.first, I), SplitOld.second); 3532 } 3533 3534 QualType wrap(ASTContext &C, const Type *Old, unsigned I) { 3535 if (I == Stack.size()) return QualType(Fn, 0); 3536 3537 switch (static_cast<WrapKind>(Stack[I++])) { 3538 case Desugar: 3539 // This is the point at which we potentially lose source 3540 // information. 3541 return wrap(C, Old->getUnqualifiedDesugaredType(), I); 3542 3543 case Parens: { 3544 QualType New = wrap(C, cast<ParenType>(Old)->getInnerType(), I); 3545 return C.getParenType(New); 3546 } 3547 3548 case Pointer: { 3549 QualType New = wrap(C, cast<PointerType>(Old)->getPointeeType(), I); 3550 return C.getPointerType(New); 3551 } 3552 3553 case BlockPointer: { 3554 QualType New = wrap(C, cast<BlockPointerType>(Old)->getPointeeType(),I); 3555 return C.getBlockPointerType(New); 3556 } 3557 3558 case MemberPointer: { 3559 const MemberPointerType *OldMPT = cast<MemberPointerType>(Old); 3560 QualType New = wrap(C, OldMPT->getPointeeType(), I); 3561 return C.getMemberPointerType(New, OldMPT->getClass()); 3562 } 3563 3564 case Reference: { 3565 const ReferenceType *OldRef = cast<ReferenceType>(Old); 3566 QualType New = wrap(C, OldRef->getPointeeType(), I); 3567 if (isa<LValueReferenceType>(OldRef)) 3568 return C.getLValueReferenceType(New, OldRef->isSpelledAsLValue()); 3569 else 3570 return C.getRValueReferenceType(New); 3571 } 3572 } 3573 3574 llvm_unreachable("unknown wrapping kind"); 3575 return QualType(); 3576 } 3577 }; 3578} 3579 3580/// Process an individual function attribute. Returns true to 3581/// indicate that the attribute was handled, false if it wasn't. 3582static bool handleFunctionTypeAttr(TypeProcessingState &state, 3583 AttributeList &attr, 3584 QualType &type) { 3585 Sema &S = state.getSema(); 3586 3587 FunctionTypeUnwrapper unwrapped(S, type); 3588 3589 if (attr.getKind() == AttributeList::AT_noreturn) { 3590 if (S.CheckNoReturnAttr(attr)) 3591 return true; 3592 3593 // Delay if this is not a function type. 3594 if (!unwrapped.isFunctionType()) 3595 return false; 3596 3597 // Otherwise we can process right away. 3598 FunctionType::ExtInfo EI = unwrapped.get()->getExtInfo().withNoReturn(true); 3599 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 3600 return true; 3601 } 3602 3603 // ns_returns_retained is not always a type attribute, but if we got 3604 // here, we're treating it as one right now. 3605 if (attr.getKind() == AttributeList::AT_ns_returns_retained) { 3606 assert(S.getLangOptions().ObjCAutoRefCount && 3607 "ns_returns_retained treated as type attribute in non-ARC"); 3608 if (attr.getNumArgs()) return true; 3609 3610 // Delay if this is not a function type. 3611 if (!unwrapped.isFunctionType()) 3612 return false; 3613 3614 FunctionType::ExtInfo EI 3615 = unwrapped.get()->getExtInfo().withProducesResult(true); 3616 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 3617 return true; 3618 } 3619 3620 if (attr.getKind() == AttributeList::AT_regparm) { 3621 unsigned value; 3622 if (S.CheckRegparmAttr(attr, value)) 3623 return true; 3624 3625 // Delay if this is not a function type. 3626 if (!unwrapped.isFunctionType()) 3627 return false; 3628 3629 // Diagnose regparm with fastcall. 3630 const FunctionType *fn = unwrapped.get(); 3631 CallingConv CC = fn->getCallConv(); 3632 if (CC == CC_X86FastCall) { 3633 S.Diag(attr.getLoc(), diag::err_attributes_are_not_compatible) 3634 << FunctionType::getNameForCallConv(CC) 3635 << "regparm"; 3636 attr.setInvalid(); 3637 return true; 3638 } 3639 3640 FunctionType::ExtInfo EI = 3641 unwrapped.get()->getExtInfo().withRegParm(value); 3642 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 3643 return true; 3644 } 3645 3646 // Otherwise, a calling convention. 3647 CallingConv CC; 3648 if (S.CheckCallingConvAttr(attr, CC)) 3649 return true; 3650 3651 // Delay if the type didn't work out to a function. 3652 if (!unwrapped.isFunctionType()) return false; 3653 3654 const FunctionType *fn = unwrapped.get(); 3655 CallingConv CCOld = fn->getCallConv(); 3656 if (S.Context.getCanonicalCallConv(CC) == 3657 S.Context.getCanonicalCallConv(CCOld)) { 3658 FunctionType::ExtInfo EI= unwrapped.get()->getExtInfo().withCallingConv(CC); 3659 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 3660 return true; 3661 } 3662 3663 if (CCOld != (S.LangOpts.MRTD ? CC_X86StdCall : CC_Default)) { 3664 // Should we diagnose reapplications of the same convention? 3665 S.Diag(attr.getLoc(), diag::err_attributes_are_not_compatible) 3666 << FunctionType::getNameForCallConv(CC) 3667 << FunctionType::getNameForCallConv(CCOld); 3668 attr.setInvalid(); 3669 return true; 3670 } 3671 3672 // Diagnose the use of X86 fastcall on varargs or unprototyped functions. 3673 if (CC == CC_X86FastCall) { 3674 if (isa<FunctionNoProtoType>(fn)) { 3675 S.Diag(attr.getLoc(), diag::err_cconv_knr) 3676 << FunctionType::getNameForCallConv(CC); 3677 attr.setInvalid(); 3678 return true; 3679 } 3680 3681 const FunctionProtoType *FnP = cast<FunctionProtoType>(fn); 3682 if (FnP->isVariadic()) { 3683 S.Diag(attr.getLoc(), diag::err_cconv_varargs) 3684 << FunctionType::getNameForCallConv(CC); 3685 attr.setInvalid(); 3686 return true; 3687 } 3688 3689 // Also diagnose fastcall with regparm. 3690 if (fn->getHasRegParm()) { 3691 S.Diag(attr.getLoc(), diag::err_attributes_are_not_compatible) 3692 << "regparm" 3693 << FunctionType::getNameForCallConv(CC); 3694 attr.setInvalid(); 3695 return true; 3696 } 3697 } 3698 3699 FunctionType::ExtInfo EI = unwrapped.get()->getExtInfo().withCallingConv(CC); 3700 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 3701 return true; 3702} 3703 3704/// Handle OpenCL image access qualifiers: read_only, write_only, read_write 3705static void HandleOpenCLImageAccessAttribute(QualType& CurType, 3706 const AttributeList &Attr, 3707 Sema &S) { 3708 // Check the attribute arguments. 3709 if (Attr.getNumArgs() != 1) { 3710 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 3711 Attr.setInvalid(); 3712 return; 3713 } 3714 Expr *sizeExpr = static_cast<Expr *>(Attr.getArg(0)); 3715 llvm::APSInt arg(32); 3716 if (sizeExpr->isTypeDependent() || sizeExpr->isValueDependent() || 3717 !sizeExpr->isIntegerConstantExpr(arg, S.Context)) { 3718 S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int) 3719 << "opencl_image_access" << sizeExpr->getSourceRange(); 3720 Attr.setInvalid(); 3721 return; 3722 } 3723 unsigned iarg = static_cast<unsigned>(arg.getZExtValue()); 3724 switch (iarg) { 3725 case CLIA_read_only: 3726 case CLIA_write_only: 3727 case CLIA_read_write: 3728 // Implemented in a separate patch 3729 break; 3730 default: 3731 // Implemented in a separate patch 3732 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_size) 3733 << sizeExpr->getSourceRange(); 3734 Attr.setInvalid(); 3735 break; 3736 } 3737} 3738 3739/// HandleVectorSizeAttribute - this attribute is only applicable to integral 3740/// and float scalars, although arrays, pointers, and function return values are 3741/// allowed in conjunction with this construct. Aggregates with this attribute 3742/// are invalid, even if they are of the same size as a corresponding scalar. 3743/// The raw attribute should contain precisely 1 argument, the vector size for 3744/// the variable, measured in bytes. If curType and rawAttr are well formed, 3745/// this routine will return a new vector type. 3746static void HandleVectorSizeAttr(QualType& CurType, const AttributeList &Attr, 3747 Sema &S) { 3748 // Check the attribute arguments. 3749 if (Attr.getNumArgs() != 1) { 3750 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 3751 Attr.setInvalid(); 3752 return; 3753 } 3754 Expr *sizeExpr = static_cast<Expr *>(Attr.getArg(0)); 3755 llvm::APSInt vecSize(32); 3756 if (sizeExpr->isTypeDependent() || sizeExpr->isValueDependent() || 3757 !sizeExpr->isIntegerConstantExpr(vecSize, S.Context)) { 3758 S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int) 3759 << "vector_size" << sizeExpr->getSourceRange(); 3760 Attr.setInvalid(); 3761 return; 3762 } 3763 // the base type must be integer or float, and can't already be a vector. 3764 if (!CurType->isIntegerType() && !CurType->isRealFloatingType()) { 3765 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_vector_type) << CurType; 3766 Attr.setInvalid(); 3767 return; 3768 } 3769 unsigned typeSize = static_cast<unsigned>(S.Context.getTypeSize(CurType)); 3770 // vecSize is specified in bytes - convert to bits. 3771 unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue() * 8); 3772 3773 // the vector size needs to be an integral multiple of the type size. 3774 if (vectorSize % typeSize) { 3775 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_size) 3776 << sizeExpr->getSourceRange(); 3777 Attr.setInvalid(); 3778 return; 3779 } 3780 if (vectorSize == 0) { 3781 S.Diag(Attr.getLoc(), diag::err_attribute_zero_size) 3782 << sizeExpr->getSourceRange(); 3783 Attr.setInvalid(); 3784 return; 3785 } 3786 3787 // Success! Instantiate the vector type, the number of elements is > 0, and 3788 // not required to be a power of 2, unlike GCC. 3789 CurType = S.Context.getVectorType(CurType, vectorSize/typeSize, 3790 VectorType::GenericVector); 3791} 3792 3793/// \brief Process the OpenCL-like ext_vector_type attribute when it occurs on 3794/// a type. 3795static void HandleExtVectorTypeAttr(QualType &CurType, 3796 const AttributeList &Attr, 3797 Sema &S) { 3798 Expr *sizeExpr; 3799 3800 // Special case where the argument is a template id. 3801 if (Attr.getParameterName()) { 3802 CXXScopeSpec SS; 3803 UnqualifiedId id; 3804 id.setIdentifier(Attr.getParameterName(), Attr.getLoc()); 3805 3806 ExprResult Size = S.ActOnIdExpression(S.getCurScope(), SS, id, false, 3807 false); 3808 if (Size.isInvalid()) 3809 return; 3810 3811 sizeExpr = Size.get(); 3812 } else { 3813 // check the attribute arguments. 3814 if (Attr.getNumArgs() != 1) { 3815 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 3816 return; 3817 } 3818 sizeExpr = Attr.getArg(0); 3819 } 3820 3821 // Create the vector type. 3822 QualType T = S.BuildExtVectorType(CurType, sizeExpr, Attr.getLoc()); 3823 if (!T.isNull()) 3824 CurType = T; 3825} 3826 3827/// HandleNeonVectorTypeAttr - The "neon_vector_type" and 3828/// "neon_polyvector_type" attributes are used to create vector types that 3829/// are mangled according to ARM's ABI. Otherwise, these types are identical 3830/// to those created with the "vector_size" attribute. Unlike "vector_size" 3831/// the argument to these Neon attributes is the number of vector elements, 3832/// not the vector size in bytes. The vector width and element type must 3833/// match one of the standard Neon vector types. 3834static void HandleNeonVectorTypeAttr(QualType& CurType, 3835 const AttributeList &Attr, Sema &S, 3836 VectorType::VectorKind VecKind, 3837 const char *AttrName) { 3838 // Check the attribute arguments. 3839 if (Attr.getNumArgs() != 1) { 3840 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 3841 Attr.setInvalid(); 3842 return; 3843 } 3844 // The number of elements must be an ICE. 3845 Expr *numEltsExpr = static_cast<Expr *>(Attr.getArg(0)); 3846 llvm::APSInt numEltsInt(32); 3847 if (numEltsExpr->isTypeDependent() || numEltsExpr->isValueDependent() || 3848 !numEltsExpr->isIntegerConstantExpr(numEltsInt, S.Context)) { 3849 S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int) 3850 << AttrName << numEltsExpr->getSourceRange(); 3851 Attr.setInvalid(); 3852 return; 3853 } 3854 // Only certain element types are supported for Neon vectors. 3855 const BuiltinType* BTy = CurType->getAs<BuiltinType>(); 3856 if (!BTy || 3857 (VecKind == VectorType::NeonPolyVector && 3858 BTy->getKind() != BuiltinType::SChar && 3859 BTy->getKind() != BuiltinType::Short) || 3860 (BTy->getKind() != BuiltinType::SChar && 3861 BTy->getKind() != BuiltinType::UChar && 3862 BTy->getKind() != BuiltinType::Short && 3863 BTy->getKind() != BuiltinType::UShort && 3864 BTy->getKind() != BuiltinType::Int && 3865 BTy->getKind() != BuiltinType::UInt && 3866 BTy->getKind() != BuiltinType::LongLong && 3867 BTy->getKind() != BuiltinType::ULongLong && 3868 BTy->getKind() != BuiltinType::Float)) { 3869 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_vector_type) <<CurType; 3870 Attr.setInvalid(); 3871 return; 3872 } 3873 // The total size of the vector must be 64 or 128 bits. 3874 unsigned typeSize = static_cast<unsigned>(S.Context.getTypeSize(CurType)); 3875 unsigned numElts = static_cast<unsigned>(numEltsInt.getZExtValue()); 3876 unsigned vecSize = typeSize * numElts; 3877 if (vecSize != 64 && vecSize != 128) { 3878 S.Diag(Attr.getLoc(), diag::err_attribute_bad_neon_vector_size) << CurType; 3879 Attr.setInvalid(); 3880 return; 3881 } 3882 3883 CurType = S.Context.getVectorType(CurType, numElts, VecKind); 3884} 3885 3886static void processTypeAttrs(TypeProcessingState &state, QualType &type, 3887 bool isDeclSpec, AttributeList *attrs) { 3888 // Scan through and apply attributes to this type where it makes sense. Some 3889 // attributes (such as __address_space__, __vector_size__, etc) apply to the 3890 // type, but others can be present in the type specifiers even though they 3891 // apply to the decl. Here we apply type attributes and ignore the rest. 3892 3893 AttributeList *next; 3894 do { 3895 AttributeList &attr = *attrs; 3896 next = attr.getNext(); 3897 3898 // Skip attributes that were marked to be invalid. 3899 if (attr.isInvalid()) 3900 continue; 3901 3902 // If this is an attribute we can handle, do so now, 3903 // otherwise, add it to the FnAttrs list for rechaining. 3904 switch (attr.getKind()) { 3905 default: break; 3906 3907 case AttributeList::AT_may_alias: 3908 // FIXME: This attribute needs to actually be handled, but if we ignore 3909 // it it breaks large amounts of Linux software. 3910 attr.setUsedAsTypeAttr(); 3911 break; 3912 case AttributeList::AT_address_space: 3913 HandleAddressSpaceTypeAttribute(type, attr, state.getSema()); 3914 attr.setUsedAsTypeAttr(); 3915 break; 3916 OBJC_POINTER_TYPE_ATTRS_CASELIST: 3917 if (!handleObjCPointerTypeAttr(state, attr, type)) 3918 distributeObjCPointerTypeAttr(state, attr, type); 3919 attr.setUsedAsTypeAttr(); 3920 break; 3921 case AttributeList::AT_vector_size: 3922 HandleVectorSizeAttr(type, attr, state.getSema()); 3923 attr.setUsedAsTypeAttr(); 3924 break; 3925 case AttributeList::AT_ext_vector_type: 3926 if (state.getDeclarator().getDeclSpec().getStorageClassSpec() 3927 != DeclSpec::SCS_typedef) 3928 HandleExtVectorTypeAttr(type, attr, state.getSema()); 3929 attr.setUsedAsTypeAttr(); 3930 break; 3931 case AttributeList::AT_neon_vector_type: 3932 HandleNeonVectorTypeAttr(type, attr, state.getSema(), 3933 VectorType::NeonVector, "neon_vector_type"); 3934 attr.setUsedAsTypeAttr(); 3935 break; 3936 case AttributeList::AT_neon_polyvector_type: 3937 HandleNeonVectorTypeAttr(type, attr, state.getSema(), 3938 VectorType::NeonPolyVector, 3939 "neon_polyvector_type"); 3940 attr.setUsedAsTypeAttr(); 3941 break; 3942 case AttributeList::AT_opencl_image_access: 3943 HandleOpenCLImageAccessAttribute(type, attr, state.getSema()); 3944 attr.setUsedAsTypeAttr(); 3945 break; 3946 3947 case AttributeList::AT_ns_returns_retained: 3948 if (!state.getSema().getLangOptions().ObjCAutoRefCount) 3949 break; 3950 // fallthrough into the function attrs 3951 3952 FUNCTION_TYPE_ATTRS_CASELIST: 3953 attr.setUsedAsTypeAttr(); 3954 3955 // Never process function type attributes as part of the 3956 // declaration-specifiers. 3957 if (isDeclSpec) 3958 distributeFunctionTypeAttrFromDeclSpec(state, attr, type); 3959 3960 // Otherwise, handle the possible delays. 3961 else if (!handleFunctionTypeAttr(state, attr, type)) 3962 distributeFunctionTypeAttr(state, attr, type); 3963 break; 3964 } 3965 } while ((attrs = next)); 3966} 3967 3968/// \brief Ensure that the type of the given expression is complete. 3969/// 3970/// This routine checks whether the expression \p E has a complete type. If the 3971/// expression refers to an instantiable construct, that instantiation is 3972/// performed as needed to complete its type. Furthermore 3973/// Sema::RequireCompleteType is called for the expression's type (or in the 3974/// case of a reference type, the referred-to type). 3975/// 3976/// \param E The expression whose type is required to be complete. 3977/// \param PD The partial diagnostic that will be printed out if the type cannot 3978/// be completed. 3979/// 3980/// \returns \c true if the type of \p E is incomplete and diagnosed, \c false 3981/// otherwise. 3982bool Sema::RequireCompleteExprType(Expr *E, const PartialDiagnostic &PD, 3983 std::pair<SourceLocation, 3984 PartialDiagnostic> Note) { 3985 QualType T = E->getType(); 3986 3987 // Fast path the case where the type is already complete. 3988 if (!T->isIncompleteType()) 3989 return false; 3990 3991 // Incomplete array types may be completed by the initializer attached to 3992 // their definitions. For static data members of class templates we need to 3993 // instantiate the definition to get this initializer and complete the type. 3994 if (T->isIncompleteArrayType()) { 3995 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E->IgnoreParens())) { 3996 if (VarDecl *Var = dyn_cast<VarDecl>(DRE->getDecl())) { 3997 if (Var->isStaticDataMember() && 3998 Var->getInstantiatedFromStaticDataMember()) { 3999 4000 MemberSpecializationInfo *MSInfo = Var->getMemberSpecializationInfo(); 4001 assert(MSInfo && "Missing member specialization information?"); 4002 if (MSInfo->getTemplateSpecializationKind() 4003 != TSK_ExplicitSpecialization) { 4004 // If we don't already have a point of instantiation, this is it. 4005 if (MSInfo->getPointOfInstantiation().isInvalid()) { 4006 MSInfo->setPointOfInstantiation(E->getLocStart()); 4007 4008 // This is a modification of an existing AST node. Notify 4009 // listeners. 4010 if (ASTMutationListener *L = getASTMutationListener()) 4011 L->StaticDataMemberInstantiated(Var); 4012 } 4013 4014 InstantiateStaticDataMemberDefinition(E->getExprLoc(), Var); 4015 4016 // Update the type to the newly instantiated definition's type both 4017 // here and within the expression. 4018 if (VarDecl *Def = Var->getDefinition()) { 4019 DRE->setDecl(Def); 4020 T = Def->getType(); 4021 DRE->setType(T); 4022 E->setType(T); 4023 } 4024 } 4025 4026 // We still go on to try to complete the type independently, as it 4027 // may also require instantiations or diagnostics if it remains 4028 // incomplete. 4029 } 4030 } 4031 } 4032 } 4033 4034 // FIXME: Are there other cases which require instantiating something other 4035 // than the type to complete the type of an expression? 4036 4037 // Look through reference types and complete the referred type. 4038 if (const ReferenceType *Ref = T->getAs<ReferenceType>()) 4039 T = Ref->getPointeeType(); 4040 4041 return RequireCompleteType(E->getExprLoc(), T, PD, Note); 4042} 4043 4044/// @brief Ensure that the type T is a complete type. 4045/// 4046/// This routine checks whether the type @p T is complete in any 4047/// context where a complete type is required. If @p T is a complete 4048/// type, returns false. If @p T is a class template specialization, 4049/// this routine then attempts to perform class template 4050/// instantiation. If instantiation fails, or if @p T is incomplete 4051/// and cannot be completed, issues the diagnostic @p diag (giving it 4052/// the type @p T) and returns true. 4053/// 4054/// @param Loc The location in the source that the incomplete type 4055/// diagnostic should refer to. 4056/// 4057/// @param T The type that this routine is examining for completeness. 4058/// 4059/// @param PD The partial diagnostic that will be printed out if T is not a 4060/// complete type. 4061/// 4062/// @returns @c true if @p T is incomplete and a diagnostic was emitted, 4063/// @c false otherwise. 4064bool Sema::RequireCompleteType(SourceLocation Loc, QualType T, 4065 const PartialDiagnostic &PD, 4066 std::pair<SourceLocation, 4067 PartialDiagnostic> Note) { 4068 unsigned diag = PD.getDiagID(); 4069 4070 // FIXME: Add this assertion to make sure we always get instantiation points. 4071 // assert(!Loc.isInvalid() && "Invalid location in RequireCompleteType"); 4072 // FIXME: Add this assertion to help us flush out problems with 4073 // checking for dependent types and type-dependent expressions. 4074 // 4075 // assert(!T->isDependentType() && 4076 // "Can't ask whether a dependent type is complete"); 4077 4078 // If we have a complete type, we're done. 4079 NamedDecl *Def = 0; 4080 if (!T->isIncompleteType(&Def)) { 4081 // If we know about the definition but it is not visible, complain. 4082 if (diag != 0 && Def && !LookupResult::isVisible(Def)) { 4083 // Suppress this error outside of a SFINAE context if we've already 4084 // emitted the error once for this type. There's no usefulness in 4085 // repeating the diagnostic. 4086 // FIXME: Add a Fix-It that imports the corresponding module or includes 4087 // the header. 4088 if (isSFINAEContext() || HiddenDefinitions.insert(Def)) { 4089 Diag(Loc, diag::err_module_private_definition) << T; 4090 Diag(Def->getLocation(), diag::note_previous_definition); 4091 } 4092 } 4093 4094 return false; 4095 } 4096 4097 const TagType *Tag = T->getAs<TagType>(); 4098 const ObjCInterfaceType *IFace = 0; 4099 4100 if (Tag) { 4101 // Avoid diagnosing invalid decls as incomplete. 4102 if (Tag->getDecl()->isInvalidDecl()) 4103 return true; 4104 4105 // Give the external AST source a chance to complete the type. 4106 if (Tag->getDecl()->hasExternalLexicalStorage()) { 4107 Context.getExternalSource()->CompleteType(Tag->getDecl()); 4108 if (!Tag->isIncompleteType()) 4109 return false; 4110 } 4111 } 4112 else if ((IFace = T->getAs<ObjCInterfaceType>())) { 4113 // Avoid diagnosing invalid decls as incomplete. 4114 if (IFace->getDecl()->isInvalidDecl()) 4115 return true; 4116 4117 // Give the external AST source a chance to complete the type. 4118 if (IFace->getDecl()->hasExternalLexicalStorage()) { 4119 Context.getExternalSource()->CompleteType(IFace->getDecl()); 4120 if (!IFace->isIncompleteType()) 4121 return false; 4122 } 4123 } 4124 4125 // If we have a class template specialization or a class member of a 4126 // class template specialization, or an array with known size of such, 4127 // try to instantiate it. 4128 QualType MaybeTemplate = T; 4129 if (const ConstantArrayType *Array = Context.getAsConstantArrayType(T)) 4130 MaybeTemplate = Array->getElementType(); 4131 if (const RecordType *Record = MaybeTemplate->getAs<RecordType>()) { 4132 if (ClassTemplateSpecializationDecl *ClassTemplateSpec 4133 = dyn_cast<ClassTemplateSpecializationDecl>(Record->getDecl())) { 4134 if (ClassTemplateSpec->getSpecializationKind() == TSK_Undeclared) 4135 return InstantiateClassTemplateSpecialization(Loc, ClassTemplateSpec, 4136 TSK_ImplicitInstantiation, 4137 /*Complain=*/diag != 0); 4138 } else if (CXXRecordDecl *Rec 4139 = dyn_cast<CXXRecordDecl>(Record->getDecl())) { 4140 if (CXXRecordDecl *Pattern = Rec->getInstantiatedFromMemberClass()) { 4141 MemberSpecializationInfo *MSInfo = Rec->getMemberSpecializationInfo(); 4142 assert(MSInfo && "Missing member specialization information?"); 4143 // This record was instantiated from a class within a template. 4144 if (MSInfo->getTemplateSpecializationKind() 4145 != TSK_ExplicitSpecialization) 4146 return InstantiateClass(Loc, Rec, Pattern, 4147 getTemplateInstantiationArgs(Rec), 4148 TSK_ImplicitInstantiation, 4149 /*Complain=*/diag != 0); 4150 } 4151 } 4152 } 4153 4154 if (diag == 0) 4155 return true; 4156 4157 // We have an incomplete type. Produce a diagnostic. 4158 Diag(Loc, PD) << T; 4159 4160 // If we have a note, produce it. 4161 if (!Note.first.isInvalid()) 4162 Diag(Note.first, Note.second); 4163 4164 // If the type was a forward declaration of a class/struct/union 4165 // type, produce a note. 4166 if (Tag && !Tag->getDecl()->isInvalidDecl()) 4167 Diag(Tag->getDecl()->getLocation(), 4168 Tag->isBeingDefined() ? diag::note_type_being_defined 4169 : diag::note_forward_declaration) 4170 << QualType(Tag, 0); 4171 4172 // If the Objective-C class was a forward declaration, produce a note. 4173 if (IFace && !IFace->getDecl()->isInvalidDecl()) 4174 Diag(IFace->getDecl()->getLocation(), diag::note_forward_class); 4175 4176 return true; 4177} 4178 4179bool Sema::RequireCompleteType(SourceLocation Loc, QualType T, 4180 const PartialDiagnostic &PD) { 4181 return RequireCompleteType(Loc, T, PD, 4182 std::make_pair(SourceLocation(), PDiag(0))); 4183} 4184 4185bool Sema::RequireCompleteType(SourceLocation Loc, QualType T, 4186 unsigned DiagID) { 4187 return RequireCompleteType(Loc, T, PDiag(DiagID), 4188 std::make_pair(SourceLocation(), PDiag(0))); 4189} 4190 4191/// @brief Ensure that the type T is a literal type. 4192/// 4193/// This routine checks whether the type @p T is a literal type. If @p T is an 4194/// incomplete type, an attempt is made to complete it. If @p T is a literal 4195/// type, or @p AllowIncompleteType is true and @p T is an incomplete type, 4196/// returns false. Otherwise, this routine issues the diagnostic @p PD (giving 4197/// it the type @p T), along with notes explaining why the type is not a 4198/// literal type, and returns true. 4199/// 4200/// @param Loc The location in the source that the non-literal type 4201/// diagnostic should refer to. 4202/// 4203/// @param T The type that this routine is examining for literalness. 4204/// 4205/// @param PD The partial diagnostic that will be printed out if T is not a 4206/// literal type. 4207/// 4208/// @param AllowIncompleteType If true, an incomplete type will be considered 4209/// acceptable. 4210/// 4211/// @returns @c true if @p T is not a literal type and a diagnostic was emitted, 4212/// @c false otherwise. 4213bool Sema::RequireLiteralType(SourceLocation Loc, QualType T, 4214 const PartialDiagnostic &PD, 4215 bool AllowIncompleteType) { 4216 assert(!T->isDependentType() && "type should not be dependent"); 4217 4218 bool Incomplete = RequireCompleteType(Loc, T, 0); 4219 if (T->isLiteralType() || (AllowIncompleteType && Incomplete)) 4220 return false; 4221 4222 if (PD.getDiagID() == 0) 4223 return true; 4224 4225 Diag(Loc, PD) << T; 4226 4227 if (T->isVariableArrayType()) 4228 return true; 4229 4230 const RecordType *RT = T->getBaseElementTypeUnsafe()->getAs<RecordType>(); 4231 if (!RT) 4232 return true; 4233 4234 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 4235 4236 // If the class has virtual base classes, then it's not an aggregate, and 4237 // cannot have any constexpr constructors, so is non-literal. This is better 4238 // to diagnose than the resulting absence of constexpr constructors. 4239 if (RD->getNumVBases()) { 4240 Diag(RD->getLocation(), diag::note_non_literal_virtual_base) 4241 << RD->isStruct() << RD->getNumVBases(); 4242 for (CXXRecordDecl::base_class_const_iterator I = RD->vbases_begin(), 4243 E = RD->vbases_end(); I != E; ++I) 4244 Diag(I->getSourceRange().getBegin(), 4245 diag::note_constexpr_virtual_base_here) << I->getSourceRange(); 4246 } else if (!RD->isAggregate() && !RD->hasConstexprNonCopyMoveConstructor()) { 4247 Diag(RD->getLocation(), diag::note_non_literal_no_constexpr_ctors) << RD; 4248 4249 switch (RD->getTemplateSpecializationKind()) { 4250 case TSK_Undeclared: 4251 case TSK_ExplicitSpecialization: 4252 break; 4253 4254 case TSK_ImplicitInstantiation: 4255 case TSK_ExplicitInstantiationDeclaration: 4256 case TSK_ExplicitInstantiationDefinition: 4257 // If the base template had constexpr constructors which were 4258 // instantiated as non-constexpr constructors, explain why. 4259 for (CXXRecordDecl::ctor_iterator I = RD->ctor_begin(), 4260 E = RD->ctor_end(); I != E; ++I) { 4261 if ((*I)->isCopyConstructor() || (*I)->isMoveConstructor()) 4262 continue; 4263 4264 FunctionDecl *Base = (*I)->getInstantiatedFromMemberFunction(); 4265 if (Base && Base->isConstexpr()) 4266 CheckConstexprFunctionDecl(*I, CCK_NoteNonConstexprInstantiation); 4267 } 4268 } 4269 } else if (RD->hasNonLiteralTypeFieldsOrBases()) { 4270 for (CXXRecordDecl::base_class_const_iterator I = RD->bases_begin(), 4271 E = RD->bases_end(); I != E; ++I) { 4272 if (!I->getType()->isLiteralType()) { 4273 Diag(I->getSourceRange().getBegin(), 4274 diag::note_non_literal_base_class) 4275 << RD << I->getType() << I->getSourceRange(); 4276 return true; 4277 } 4278 } 4279 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 4280 E = RD->field_end(); I != E; ++I) { 4281 if (!(*I)->getType()->isLiteralType()) { 4282 Diag((*I)->getLocation(), diag::note_non_literal_field) 4283 << RD << (*I) << (*I)->getType(); 4284 return true; 4285 } else if ((*I)->isMutable()) { 4286 Diag((*I)->getLocation(), diag::note_non_literal_mutable_field) << RD; 4287 return true; 4288 } 4289 } 4290 } else if (!RD->hasTrivialDestructor()) { 4291 // All fields and bases are of literal types, so have trivial destructors. 4292 // If this class's destructor is non-trivial it must be user-declared. 4293 CXXDestructorDecl *Dtor = RD->getDestructor(); 4294 assert(Dtor && "class has literal fields and bases but no dtor?"); 4295 if (!Dtor) 4296 return true; 4297 4298 Diag(Dtor->getLocation(), Dtor->isUserProvided() ? 4299 diag::note_non_literal_user_provided_dtor : 4300 diag::note_non_literal_nontrivial_dtor) << RD; 4301 } 4302 4303 return true; 4304} 4305 4306/// \brief Retrieve a version of the type 'T' that is elaborated by Keyword 4307/// and qualified by the nested-name-specifier contained in SS. 4308QualType Sema::getElaboratedType(ElaboratedTypeKeyword Keyword, 4309 const CXXScopeSpec &SS, QualType T) { 4310 if (T.isNull()) 4311 return T; 4312 NestedNameSpecifier *NNS; 4313 if (SS.isValid()) 4314 NNS = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 4315 else { 4316 if (Keyword == ETK_None) 4317 return T; 4318 NNS = 0; 4319 } 4320 return Context.getElaboratedType(Keyword, NNS, T); 4321} 4322 4323QualType Sema::BuildTypeofExprType(Expr *E, SourceLocation Loc) { 4324 ExprResult ER = CheckPlaceholderExpr(E); 4325 if (ER.isInvalid()) return QualType(); 4326 E = ER.take(); 4327 4328 if (!E->isTypeDependent()) { 4329 QualType T = E->getType(); 4330 if (const TagType *TT = T->getAs<TagType>()) 4331 DiagnoseUseOfDecl(TT->getDecl(), E->getExprLoc()); 4332 } 4333 return Context.getTypeOfExprType(E); 4334} 4335 4336QualType Sema::BuildDecltypeType(Expr *E, SourceLocation Loc) { 4337 ExprResult ER = CheckPlaceholderExpr(E); 4338 if (ER.isInvalid()) return QualType(); 4339 E = ER.take(); 4340 4341 return Context.getDecltypeType(E); 4342} 4343 4344QualType Sema::BuildUnaryTransformType(QualType BaseType, 4345 UnaryTransformType::UTTKind UKind, 4346 SourceLocation Loc) { 4347 switch (UKind) { 4348 case UnaryTransformType::EnumUnderlyingType: 4349 if (!BaseType->isDependentType() && !BaseType->isEnumeralType()) { 4350 Diag(Loc, diag::err_only_enums_have_underlying_types); 4351 return QualType(); 4352 } else { 4353 QualType Underlying = BaseType; 4354 if (!BaseType->isDependentType()) { 4355 EnumDecl *ED = BaseType->getAs<EnumType>()->getDecl(); 4356 assert(ED && "EnumType has no EnumDecl"); 4357 DiagnoseUseOfDecl(ED, Loc); 4358 Underlying = ED->getIntegerType(); 4359 } 4360 assert(!Underlying.isNull()); 4361 return Context.getUnaryTransformType(BaseType, Underlying, 4362 UnaryTransformType::EnumUnderlyingType); 4363 } 4364 } 4365 llvm_unreachable("unknown unary transform type"); 4366} 4367 4368QualType Sema::BuildAtomicType(QualType T, SourceLocation Loc) { 4369 if (!T->isDependentType()) { 4370 int DisallowedKind = -1; 4371 if (T->isIncompleteType()) 4372 // FIXME: It isn't entirely clear whether incomplete atomic types 4373 // are allowed or not; for simplicity, ban them for the moment. 4374 DisallowedKind = 0; 4375 else if (T->isArrayType()) 4376 DisallowedKind = 1; 4377 else if (T->isFunctionType()) 4378 DisallowedKind = 2; 4379 else if (T->isReferenceType()) 4380 DisallowedKind = 3; 4381 else if (T->isAtomicType()) 4382 DisallowedKind = 4; 4383 else if (T.hasQualifiers()) 4384 DisallowedKind = 5; 4385 else if (!T.isTriviallyCopyableType(Context)) 4386 // Some other non-trivially-copyable type (probably a C++ class) 4387 DisallowedKind = 6; 4388 4389 if (DisallowedKind != -1) { 4390 Diag(Loc, diag::err_atomic_specifier_bad_type) << DisallowedKind << T; 4391 return QualType(); 4392 } 4393 4394 // FIXME: Do we need any handling for ARC here? 4395 } 4396 4397 // Build the pointer type. 4398 return Context.getAtomicType(T); 4399} 4400