SemaType.cpp revision 66581d41527628d4b37f7b05c288f77be7415d7d
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, skip adding a 1061 // qualification. 1062 } else if (S.ExprEvalContexts.back().Context == Sema::Unevaluated) { 1063 return type; 1064 1065 // If that failed, give an error and recover using __strong. __strong 1066 // is the option most likely to prevent spurious second-order diagnostics, 1067 // like when binding a reference to a field. 1068 } else { 1069 // These types can show up in private ivars in system headers, so 1070 // we need this to not be an error in those cases. Instead we 1071 // want to delay. 1072 if (S.DelayedDiagnostics.shouldDelayDiagnostics()) { 1073 S.DelayedDiagnostics.add( 1074 sema::DelayedDiagnostic::makeForbiddenType(loc, 1075 diag::err_arc_indirect_no_ownership, type, isReference)); 1076 } else { 1077 S.Diag(loc, diag::err_arc_indirect_no_ownership) << type << isReference; 1078 } 1079 implicitLifetime = Qualifiers::OCL_Strong; 1080 } 1081 assert(implicitLifetime && "didn't infer any lifetime!"); 1082 1083 Qualifiers qs; 1084 qs.addObjCLifetime(implicitLifetime); 1085 return S.Context.getQualifiedType(type, qs); 1086} 1087 1088/// \brief Build a pointer type. 1089/// 1090/// \param T The type to which we'll be building a pointer. 1091/// 1092/// \param Loc The location of the entity whose type involves this 1093/// pointer type or, if there is no such entity, the location of the 1094/// type that will have pointer type. 1095/// 1096/// \param Entity The name of the entity that involves the pointer 1097/// type, if known. 1098/// 1099/// \returns A suitable pointer type, if there are no 1100/// errors. Otherwise, returns a NULL type. 1101QualType Sema::BuildPointerType(QualType T, 1102 SourceLocation Loc, DeclarationName Entity) { 1103 if (T->isReferenceType()) { 1104 // C++ 8.3.2p4: There shall be no ... pointers to references ... 1105 Diag(Loc, diag::err_illegal_decl_pointer_to_reference) 1106 << getPrintableNameForEntity(Entity) << T; 1107 return QualType(); 1108 } 1109 1110 assert(!T->isObjCObjectType() && "Should build ObjCObjectPointerType"); 1111 1112 // In ARC, it is forbidden to build pointers to unqualified pointers. 1113 if (getLangOptions().ObjCAutoRefCount) 1114 T = inferARCLifetimeForPointee(*this, T, Loc, /*reference*/ false); 1115 1116 // Build the pointer type. 1117 return Context.getPointerType(T); 1118} 1119 1120/// \brief Build a reference type. 1121/// 1122/// \param T The type to which we'll be building a reference. 1123/// 1124/// \param Loc The location of the entity whose type involves this 1125/// reference type or, if there is no such entity, the location of the 1126/// type that will have reference type. 1127/// 1128/// \param Entity The name of the entity that involves the reference 1129/// type, if known. 1130/// 1131/// \returns A suitable reference type, if there are no 1132/// errors. Otherwise, returns a NULL type. 1133QualType Sema::BuildReferenceType(QualType T, bool SpelledAsLValue, 1134 SourceLocation Loc, 1135 DeclarationName Entity) { 1136 assert(Context.getCanonicalType(T) != Context.OverloadTy && 1137 "Unresolved overloaded function type"); 1138 1139 // C++0x [dcl.ref]p6: 1140 // If a typedef (7.1.3), a type template-parameter (14.3.1), or a 1141 // decltype-specifier (7.1.6.2) denotes a type TR that is a reference to a 1142 // type T, an attempt to create the type "lvalue reference to cv TR" creates 1143 // the type "lvalue reference to T", while an attempt to create the type 1144 // "rvalue reference to cv TR" creates the type TR. 1145 bool LValueRef = SpelledAsLValue || T->getAs<LValueReferenceType>(); 1146 1147 // C++ [dcl.ref]p4: There shall be no references to references. 1148 // 1149 // According to C++ DR 106, references to references are only 1150 // diagnosed when they are written directly (e.g., "int & &"), 1151 // but not when they happen via a typedef: 1152 // 1153 // typedef int& intref; 1154 // typedef intref& intref2; 1155 // 1156 // Parser::ParseDeclaratorInternal diagnoses the case where 1157 // references are written directly; here, we handle the 1158 // collapsing of references-to-references as described in C++0x. 1159 // DR 106 and 540 introduce reference-collapsing into C++98/03. 1160 1161 // C++ [dcl.ref]p1: 1162 // A declarator that specifies the type "reference to cv void" 1163 // is ill-formed. 1164 if (T->isVoidType()) { 1165 Diag(Loc, diag::err_reference_to_void); 1166 return QualType(); 1167 } 1168 1169 // In ARC, it is forbidden to build references to unqualified pointers. 1170 if (getLangOptions().ObjCAutoRefCount) 1171 T = inferARCLifetimeForPointee(*this, T, Loc, /*reference*/ true); 1172 1173 // Handle restrict on references. 1174 if (LValueRef) 1175 return Context.getLValueReferenceType(T, SpelledAsLValue); 1176 return Context.getRValueReferenceType(T); 1177} 1178 1179/// Check whether the specified array size makes the array type a VLA. If so, 1180/// return true, if not, return the size of the array in SizeVal. 1181static bool isArraySizeVLA(Sema &S, Expr *ArraySize, llvm::APSInt &SizeVal) { 1182 // If the size is an ICE, it certainly isn't a VLA. If we're in a GNU mode 1183 // (like gnu99, but not c99) accept any evaluatable value as an extension. 1184 return S.VerifyIntegerConstantExpression( 1185 ArraySize, &SizeVal, S.PDiag(), S.LangOpts.GNUMode, 1186 S.PDiag(diag::ext_vla_folded_to_constant)).isInvalid(); 1187} 1188 1189 1190/// \brief Build an array type. 1191/// 1192/// \param T The type of each element in the array. 1193/// 1194/// \param ASM C99 array size modifier (e.g., '*', 'static'). 1195/// 1196/// \param ArraySize Expression describing the size of the array. 1197/// 1198/// \param Loc The location of the entity whose type involves this 1199/// array type or, if there is no such entity, the location of the 1200/// type that will have array type. 1201/// 1202/// \param Entity The name of the entity that involves the array 1203/// type, if known. 1204/// 1205/// \returns A suitable array type, if there are no errors. Otherwise, 1206/// returns a NULL type. 1207QualType Sema::BuildArrayType(QualType T, ArrayType::ArraySizeModifier ASM, 1208 Expr *ArraySize, unsigned Quals, 1209 SourceRange Brackets, DeclarationName Entity) { 1210 1211 SourceLocation Loc = Brackets.getBegin(); 1212 if (getLangOptions().CPlusPlus) { 1213 // C++ [dcl.array]p1: 1214 // T is called the array element type; this type shall not be a reference 1215 // type, the (possibly cv-qualified) type void, a function type or an 1216 // abstract class type. 1217 // 1218 // Note: function types are handled in the common path with C. 1219 if (T->isReferenceType()) { 1220 Diag(Loc, diag::err_illegal_decl_array_of_references) 1221 << getPrintableNameForEntity(Entity) << T; 1222 return QualType(); 1223 } 1224 1225 if (T->isVoidType()) { 1226 Diag(Loc, diag::err_illegal_decl_array_incomplete_type) << T; 1227 return QualType(); 1228 } 1229 1230 if (RequireNonAbstractType(Brackets.getBegin(), T, 1231 diag::err_array_of_abstract_type)) 1232 return QualType(); 1233 1234 } else { 1235 // C99 6.7.5.2p1: If the element type is an incomplete or function type, 1236 // reject it (e.g. void ary[7], struct foo ary[7], void ary[7]()) 1237 if (RequireCompleteType(Loc, T, 1238 diag::err_illegal_decl_array_incomplete_type)) 1239 return QualType(); 1240 } 1241 1242 if (T->isFunctionType()) { 1243 Diag(Loc, diag::err_illegal_decl_array_of_functions) 1244 << getPrintableNameForEntity(Entity) << T; 1245 return QualType(); 1246 } 1247 1248 if (T->getContainedAutoType()) { 1249 Diag(Loc, diag::err_illegal_decl_array_of_auto) 1250 << getPrintableNameForEntity(Entity) << T; 1251 return QualType(); 1252 } 1253 1254 if (const RecordType *EltTy = T->getAs<RecordType>()) { 1255 // If the element type is a struct or union that contains a variadic 1256 // array, accept it as a GNU extension: C99 6.7.2.1p2. 1257 if (EltTy->getDecl()->hasFlexibleArrayMember()) 1258 Diag(Loc, diag::ext_flexible_array_in_array) << T; 1259 } else if (T->isObjCObjectType()) { 1260 Diag(Loc, diag::err_objc_array_of_interfaces) << T; 1261 return QualType(); 1262 } 1263 1264 // Do placeholder conversions on the array size expression. 1265 if (ArraySize && ArraySize->hasPlaceholderType()) { 1266 ExprResult Result = CheckPlaceholderExpr(ArraySize); 1267 if (Result.isInvalid()) return QualType(); 1268 ArraySize = Result.take(); 1269 } 1270 1271 // Do lvalue-to-rvalue conversions on the array size expression. 1272 if (ArraySize && !ArraySize->isRValue()) { 1273 ExprResult Result = DefaultLvalueConversion(ArraySize); 1274 if (Result.isInvalid()) 1275 return QualType(); 1276 1277 ArraySize = Result.take(); 1278 } 1279 1280 // C99 6.7.5.2p1: The size expression shall have integer type. 1281 // C++11 allows contextual conversions to such types. 1282 if (!getLangOptions().CPlusPlus0x && 1283 ArraySize && !ArraySize->isTypeDependent() && 1284 !ArraySize->getType()->isIntegralOrUnscopedEnumerationType()) { 1285 Diag(ArraySize->getLocStart(), diag::err_array_size_non_int) 1286 << ArraySize->getType() << ArraySize->getSourceRange(); 1287 return QualType(); 1288 } 1289 1290 llvm::APSInt ConstVal(Context.getTypeSize(Context.getSizeType())); 1291 if (!ArraySize) { 1292 if (ASM == ArrayType::Star) 1293 T = Context.getVariableArrayType(T, 0, ASM, Quals, Brackets); 1294 else 1295 T = Context.getIncompleteArrayType(T, ASM, Quals); 1296 } else if (ArraySize->isTypeDependent() || ArraySize->isValueDependent()) { 1297 T = Context.getDependentSizedArrayType(T, ArraySize, ASM, Quals, Brackets); 1298 } else if ((!T->isDependentType() && !T->isIncompleteType() && 1299 !T->isConstantSizeType()) || 1300 isArraySizeVLA(*this, ArraySize, ConstVal)) { 1301 // Even in C++11, don't allow contextual conversions in the array bound 1302 // of a VLA. 1303 if (getLangOptions().CPlusPlus0x && 1304 !ArraySize->getType()->isIntegralOrUnscopedEnumerationType()) { 1305 Diag(ArraySize->getLocStart(), diag::err_array_size_non_int) 1306 << ArraySize->getType() << ArraySize->getSourceRange(); 1307 return QualType(); 1308 } 1309 1310 // C99: an array with an element type that has a non-constant-size is a VLA. 1311 // C99: an array with a non-ICE size is a VLA. We accept any expression 1312 // that we can fold to a non-zero positive value as an extension. 1313 T = Context.getVariableArrayType(T, ArraySize, ASM, Quals, Brackets); 1314 } else { 1315 // C99 6.7.5.2p1: If the expression is a constant expression, it shall 1316 // have a value greater than zero. 1317 if (ConstVal.isSigned() && ConstVal.isNegative()) { 1318 if (Entity) 1319 Diag(ArraySize->getLocStart(), diag::err_decl_negative_array_size) 1320 << getPrintableNameForEntity(Entity) << ArraySize->getSourceRange(); 1321 else 1322 Diag(ArraySize->getLocStart(), diag::err_typecheck_negative_array_size) 1323 << ArraySize->getSourceRange(); 1324 return QualType(); 1325 } 1326 if (ConstVal == 0) { 1327 // GCC accepts zero sized static arrays. We allow them when 1328 // we're not in a SFINAE context. 1329 Diag(ArraySize->getLocStart(), 1330 isSFINAEContext()? diag::err_typecheck_zero_array_size 1331 : diag::ext_typecheck_zero_array_size) 1332 << ArraySize->getSourceRange(); 1333 1334 if (ASM == ArrayType::Static) { 1335 Diag(ArraySize->getLocStart(), 1336 diag::warn_typecheck_zero_static_array_size) 1337 << ArraySize->getSourceRange(); 1338 ASM = ArrayType::Normal; 1339 } 1340 } else if (!T->isDependentType() && !T->isVariablyModifiedType() && 1341 !T->isIncompleteType()) { 1342 // Is the array too large? 1343 unsigned ActiveSizeBits 1344 = ConstantArrayType::getNumAddressingBits(Context, T, ConstVal); 1345 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) 1346 Diag(ArraySize->getLocStart(), diag::err_array_too_large) 1347 << ConstVal.toString(10) 1348 << ArraySize->getSourceRange(); 1349 } 1350 1351 T = Context.getConstantArrayType(T, ConstVal, ASM, Quals); 1352 } 1353 // If this is not C99, extwarn about VLA's and C99 array size modifiers. 1354 if (!getLangOptions().C99) { 1355 if (T->isVariableArrayType()) { 1356 // Prohibit the use of non-POD types in VLAs. 1357 QualType BaseT = Context.getBaseElementType(T); 1358 if (!T->isDependentType() && 1359 !BaseT.isPODType(Context) && 1360 !BaseT->isObjCLifetimeType()) { 1361 Diag(Loc, diag::err_vla_non_pod) 1362 << BaseT; 1363 return QualType(); 1364 } 1365 // Prohibit the use of VLAs during template argument deduction. 1366 else if (isSFINAEContext()) { 1367 Diag(Loc, diag::err_vla_in_sfinae); 1368 return QualType(); 1369 } 1370 // Just extwarn about VLAs. 1371 else 1372 Diag(Loc, diag::ext_vla); 1373 } else if (ASM != ArrayType::Normal || Quals != 0) 1374 Diag(Loc, 1375 getLangOptions().CPlusPlus? diag::err_c99_array_usage_cxx 1376 : diag::ext_c99_array_usage) << ASM; 1377 } 1378 1379 return T; 1380} 1381 1382/// \brief Build an ext-vector type. 1383/// 1384/// Run the required checks for the extended vector type. 1385QualType Sema::BuildExtVectorType(QualType T, Expr *ArraySize, 1386 SourceLocation AttrLoc) { 1387 // unlike gcc's vector_size attribute, we do not allow vectors to be defined 1388 // in conjunction with complex types (pointers, arrays, functions, etc.). 1389 if (!T->isDependentType() && 1390 !T->isIntegerType() && !T->isRealFloatingType()) { 1391 Diag(AttrLoc, diag::err_attribute_invalid_vector_type) << T; 1392 return QualType(); 1393 } 1394 1395 if (!ArraySize->isTypeDependent() && !ArraySize->isValueDependent()) { 1396 llvm::APSInt vecSize(32); 1397 if (!ArraySize->isIntegerConstantExpr(vecSize, Context)) { 1398 Diag(AttrLoc, diag::err_attribute_argument_not_int) 1399 << "ext_vector_type" << ArraySize->getSourceRange(); 1400 return QualType(); 1401 } 1402 1403 // unlike gcc's vector_size attribute, the size is specified as the 1404 // number of elements, not the number of bytes. 1405 unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue()); 1406 1407 if (vectorSize == 0) { 1408 Diag(AttrLoc, diag::err_attribute_zero_size) 1409 << ArraySize->getSourceRange(); 1410 return QualType(); 1411 } 1412 1413 return Context.getExtVectorType(T, vectorSize); 1414 } 1415 1416 return Context.getDependentSizedExtVectorType(T, ArraySize, AttrLoc); 1417} 1418 1419/// \brief Build a function type. 1420/// 1421/// This routine checks the function type according to C++ rules and 1422/// under the assumption that the result type and parameter types have 1423/// just been instantiated from a template. It therefore duplicates 1424/// some of the behavior of GetTypeForDeclarator, but in a much 1425/// simpler form that is only suitable for this narrow use case. 1426/// 1427/// \param T The return type of the function. 1428/// 1429/// \param ParamTypes The parameter types of the function. This array 1430/// will be modified to account for adjustments to the types of the 1431/// function parameters. 1432/// 1433/// \param NumParamTypes The number of parameter types in ParamTypes. 1434/// 1435/// \param Variadic Whether this is a variadic function type. 1436/// 1437/// \param Quals The cvr-qualifiers to be applied to the function type. 1438/// 1439/// \param Loc The location of the entity whose type involves this 1440/// function type or, if there is no such entity, the location of the 1441/// type that will have function type. 1442/// 1443/// \param Entity The name of the entity that involves the function 1444/// type, if known. 1445/// 1446/// \returns A suitable function type, if there are no 1447/// errors. Otherwise, returns a NULL type. 1448QualType Sema::BuildFunctionType(QualType T, 1449 QualType *ParamTypes, 1450 unsigned NumParamTypes, 1451 bool Variadic, unsigned Quals, 1452 RefQualifierKind RefQualifier, 1453 SourceLocation Loc, DeclarationName Entity, 1454 FunctionType::ExtInfo Info) { 1455 if (T->isArrayType() || T->isFunctionType()) { 1456 Diag(Loc, diag::err_func_returning_array_function) 1457 << T->isFunctionType() << T; 1458 return QualType(); 1459 } 1460 1461 // Functions cannot return half FP. 1462 if (T->isHalfType()) { 1463 Diag(Loc, diag::err_parameters_retval_cannot_have_fp16_type) << 1 << 1464 FixItHint::CreateInsertion(Loc, "*"); 1465 return QualType(); 1466 } 1467 1468 bool Invalid = false; 1469 for (unsigned Idx = 0; Idx < NumParamTypes; ++Idx) { 1470 // FIXME: Loc is too inprecise here, should use proper locations for args. 1471 QualType ParamType = Context.getAdjustedParameterType(ParamTypes[Idx]); 1472 if (ParamType->isVoidType()) { 1473 Diag(Loc, diag::err_param_with_void_type); 1474 Invalid = true; 1475 } else if (ParamType->isHalfType()) { 1476 // Disallow half FP arguments. 1477 Diag(Loc, diag::err_parameters_retval_cannot_have_fp16_type) << 0 << 1478 FixItHint::CreateInsertion(Loc, "*"); 1479 Invalid = true; 1480 } 1481 1482 ParamTypes[Idx] = ParamType; 1483 } 1484 1485 if (Invalid) 1486 return QualType(); 1487 1488 FunctionProtoType::ExtProtoInfo EPI; 1489 EPI.Variadic = Variadic; 1490 EPI.TypeQuals = Quals; 1491 EPI.RefQualifier = RefQualifier; 1492 EPI.ExtInfo = Info; 1493 1494 return Context.getFunctionType(T, ParamTypes, NumParamTypes, EPI); 1495} 1496 1497/// \brief Build a member pointer type \c T Class::*. 1498/// 1499/// \param T the type to which the member pointer refers. 1500/// \param Class the class type into which the member pointer points. 1501/// \param CVR Qualifiers applied to the member pointer type 1502/// \param Loc the location where this type begins 1503/// \param Entity the name of the entity that will have this member pointer type 1504/// 1505/// \returns a member pointer type, if successful, or a NULL type if there was 1506/// an error. 1507QualType Sema::BuildMemberPointerType(QualType T, QualType Class, 1508 SourceLocation Loc, 1509 DeclarationName Entity) { 1510 // Verify that we're not building a pointer to pointer to function with 1511 // exception specification. 1512 if (CheckDistantExceptionSpec(T)) { 1513 Diag(Loc, diag::err_distant_exception_spec); 1514 1515 // FIXME: If we're doing this as part of template instantiation, 1516 // we should return immediately. 1517 1518 // Build the type anyway, but use the canonical type so that the 1519 // exception specifiers are stripped off. 1520 T = Context.getCanonicalType(T); 1521 } 1522 1523 // C++ 8.3.3p3: A pointer to member shall not point to ... a member 1524 // with reference type, or "cv void." 1525 if (T->isReferenceType()) { 1526 Diag(Loc, diag::err_illegal_decl_mempointer_to_reference) 1527 << (Entity? Entity.getAsString() : "type name") << T; 1528 return QualType(); 1529 } 1530 1531 if (T->isVoidType()) { 1532 Diag(Loc, diag::err_illegal_decl_mempointer_to_void) 1533 << (Entity? Entity.getAsString() : "type name"); 1534 return QualType(); 1535 } 1536 1537 if (!Class->isDependentType() && !Class->isRecordType()) { 1538 Diag(Loc, diag::err_mempointer_in_nonclass_type) << Class; 1539 return QualType(); 1540 } 1541 1542 // In the Microsoft ABI, the class is allowed to be an incomplete 1543 // type. In such cases, the compiler makes a worst-case assumption. 1544 // We make no such assumption right now, so emit an error if the 1545 // class isn't a complete type. 1546 if (Context.getTargetInfo().getCXXABI() == CXXABI_Microsoft && 1547 RequireCompleteType(Loc, Class, diag::err_incomplete_type)) 1548 return QualType(); 1549 1550 return Context.getMemberPointerType(T, Class.getTypePtr()); 1551} 1552 1553/// \brief Build a block pointer type. 1554/// 1555/// \param T The type to which we'll be building a block pointer. 1556/// 1557/// \param CVR The cvr-qualifiers to be applied to the block pointer type. 1558/// 1559/// \param Loc The location of the entity whose type involves this 1560/// block pointer type or, if there is no such entity, the location of the 1561/// type that will have block pointer type. 1562/// 1563/// \param Entity The name of the entity that involves the block pointer 1564/// type, if known. 1565/// 1566/// \returns A suitable block pointer type, if there are no 1567/// errors. Otherwise, returns a NULL type. 1568QualType Sema::BuildBlockPointerType(QualType T, 1569 SourceLocation Loc, 1570 DeclarationName Entity) { 1571 if (!T->isFunctionType()) { 1572 Diag(Loc, diag::err_nonfunction_block_type); 1573 return QualType(); 1574 } 1575 1576 return Context.getBlockPointerType(T); 1577} 1578 1579QualType Sema::GetTypeFromParser(ParsedType Ty, TypeSourceInfo **TInfo) { 1580 QualType QT = Ty.get(); 1581 if (QT.isNull()) { 1582 if (TInfo) *TInfo = 0; 1583 return QualType(); 1584 } 1585 1586 TypeSourceInfo *DI = 0; 1587 if (const LocInfoType *LIT = dyn_cast<LocInfoType>(QT)) { 1588 QT = LIT->getType(); 1589 DI = LIT->getTypeSourceInfo(); 1590 } 1591 1592 if (TInfo) *TInfo = DI; 1593 return QT; 1594} 1595 1596static void transferARCOwnershipToDeclaratorChunk(TypeProcessingState &state, 1597 Qualifiers::ObjCLifetime ownership, 1598 unsigned chunkIndex); 1599 1600/// Given that this is the declaration of a parameter under ARC, 1601/// attempt to infer attributes and such for pointer-to-whatever 1602/// types. 1603static void inferARCWriteback(TypeProcessingState &state, 1604 QualType &declSpecType) { 1605 Sema &S = state.getSema(); 1606 Declarator &declarator = state.getDeclarator(); 1607 1608 // TODO: should we care about decl qualifiers? 1609 1610 // Check whether the declarator has the expected form. We walk 1611 // from the inside out in order to make the block logic work. 1612 unsigned outermostPointerIndex = 0; 1613 bool isBlockPointer = false; 1614 unsigned numPointers = 0; 1615 for (unsigned i = 0, e = declarator.getNumTypeObjects(); i != e; ++i) { 1616 unsigned chunkIndex = i; 1617 DeclaratorChunk &chunk = declarator.getTypeObject(chunkIndex); 1618 switch (chunk.Kind) { 1619 case DeclaratorChunk::Paren: 1620 // Ignore parens. 1621 break; 1622 1623 case DeclaratorChunk::Reference: 1624 case DeclaratorChunk::Pointer: 1625 // Count the number of pointers. Treat references 1626 // interchangeably as pointers; if they're mis-ordered, normal 1627 // type building will discover that. 1628 outermostPointerIndex = chunkIndex; 1629 numPointers++; 1630 break; 1631 1632 case DeclaratorChunk::BlockPointer: 1633 // If we have a pointer to block pointer, that's an acceptable 1634 // indirect reference; anything else is not an application of 1635 // the rules. 1636 if (numPointers != 1) return; 1637 numPointers++; 1638 outermostPointerIndex = chunkIndex; 1639 isBlockPointer = true; 1640 1641 // We don't care about pointer structure in return values here. 1642 goto done; 1643 1644 case DeclaratorChunk::Array: // suppress if written (id[])? 1645 case DeclaratorChunk::Function: 1646 case DeclaratorChunk::MemberPointer: 1647 return; 1648 } 1649 } 1650 done: 1651 1652 // If we have *one* pointer, then we want to throw the qualifier on 1653 // the declaration-specifiers, which means that it needs to be a 1654 // retainable object type. 1655 if (numPointers == 1) { 1656 // If it's not a retainable object type, the rule doesn't apply. 1657 if (!declSpecType->isObjCRetainableType()) return; 1658 1659 // If it already has lifetime, don't do anything. 1660 if (declSpecType.getObjCLifetime()) return; 1661 1662 // Otherwise, modify the type in-place. 1663 Qualifiers qs; 1664 1665 if (declSpecType->isObjCARCImplicitlyUnretainedType()) 1666 qs.addObjCLifetime(Qualifiers::OCL_ExplicitNone); 1667 else 1668 qs.addObjCLifetime(Qualifiers::OCL_Autoreleasing); 1669 declSpecType = S.Context.getQualifiedType(declSpecType, qs); 1670 1671 // If we have *two* pointers, then we want to throw the qualifier on 1672 // the outermost pointer. 1673 } else if (numPointers == 2) { 1674 // If we don't have a block pointer, we need to check whether the 1675 // declaration-specifiers gave us something that will turn into a 1676 // retainable object pointer after we slap the first pointer on it. 1677 if (!isBlockPointer && !declSpecType->isObjCObjectType()) 1678 return; 1679 1680 // Look for an explicit lifetime attribute there. 1681 DeclaratorChunk &chunk = declarator.getTypeObject(outermostPointerIndex); 1682 if (chunk.Kind != DeclaratorChunk::Pointer && 1683 chunk.Kind != DeclaratorChunk::BlockPointer) 1684 return; 1685 for (const AttributeList *attr = chunk.getAttrs(); attr; 1686 attr = attr->getNext()) 1687 if (attr->getKind() == AttributeList::AT_objc_ownership) 1688 return; 1689 1690 transferARCOwnershipToDeclaratorChunk(state, Qualifiers::OCL_Autoreleasing, 1691 outermostPointerIndex); 1692 1693 // Any other number of pointers/references does not trigger the rule. 1694 } else return; 1695 1696 // TODO: mark whether we did this inference? 1697} 1698 1699static void DiagnoseIgnoredQualifiers(unsigned Quals, 1700 SourceLocation ConstQualLoc, 1701 SourceLocation VolatileQualLoc, 1702 SourceLocation RestrictQualLoc, 1703 Sema& S) { 1704 std::string QualStr; 1705 unsigned NumQuals = 0; 1706 SourceLocation Loc; 1707 1708 FixItHint ConstFixIt; 1709 FixItHint VolatileFixIt; 1710 FixItHint RestrictFixIt; 1711 1712 const SourceManager &SM = S.getSourceManager(); 1713 1714 // FIXME: The locations here are set kind of arbitrarily. It'd be nicer to 1715 // find a range and grow it to encompass all the qualifiers, regardless of 1716 // the order in which they textually appear. 1717 if (Quals & Qualifiers::Const) { 1718 ConstFixIt = FixItHint::CreateRemoval(ConstQualLoc); 1719 QualStr = "const"; 1720 ++NumQuals; 1721 if (!Loc.isValid() || SM.isBeforeInTranslationUnit(ConstQualLoc, Loc)) 1722 Loc = ConstQualLoc; 1723 } 1724 if (Quals & Qualifiers::Volatile) { 1725 VolatileFixIt = FixItHint::CreateRemoval(VolatileQualLoc); 1726 QualStr += (NumQuals == 0 ? "volatile" : " volatile"); 1727 ++NumQuals; 1728 if (!Loc.isValid() || SM.isBeforeInTranslationUnit(VolatileQualLoc, Loc)) 1729 Loc = VolatileQualLoc; 1730 } 1731 if (Quals & Qualifiers::Restrict) { 1732 RestrictFixIt = FixItHint::CreateRemoval(RestrictQualLoc); 1733 QualStr += (NumQuals == 0 ? "restrict" : " restrict"); 1734 ++NumQuals; 1735 if (!Loc.isValid() || SM.isBeforeInTranslationUnit(RestrictQualLoc, Loc)) 1736 Loc = RestrictQualLoc; 1737 } 1738 1739 assert(NumQuals > 0 && "No known qualifiers?"); 1740 1741 S.Diag(Loc, diag::warn_qual_return_type) 1742 << QualStr << NumQuals << ConstFixIt << VolatileFixIt << RestrictFixIt; 1743} 1744 1745static QualType GetDeclSpecTypeForDeclarator(TypeProcessingState &state, 1746 TypeSourceInfo *&ReturnTypeInfo) { 1747 Sema &SemaRef = state.getSema(); 1748 Declarator &D = state.getDeclarator(); 1749 QualType T; 1750 ReturnTypeInfo = 0; 1751 1752 // The TagDecl owned by the DeclSpec. 1753 TagDecl *OwnedTagDecl = 0; 1754 1755 switch (D.getName().getKind()) { 1756 case UnqualifiedId::IK_ImplicitSelfParam: 1757 case UnqualifiedId::IK_OperatorFunctionId: 1758 case UnqualifiedId::IK_Identifier: 1759 case UnqualifiedId::IK_LiteralOperatorId: 1760 case UnqualifiedId::IK_TemplateId: 1761 T = ConvertDeclSpecToType(state); 1762 1763 if (!D.isInvalidType() && D.getDeclSpec().isTypeSpecOwned()) { 1764 OwnedTagDecl = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 1765 // Owned declaration is embedded in declarator. 1766 OwnedTagDecl->setEmbeddedInDeclarator(true); 1767 } 1768 break; 1769 1770 case UnqualifiedId::IK_ConstructorName: 1771 case UnqualifiedId::IK_ConstructorTemplateId: 1772 case UnqualifiedId::IK_DestructorName: 1773 // Constructors and destructors don't have return types. Use 1774 // "void" instead. 1775 T = SemaRef.Context.VoidTy; 1776 break; 1777 1778 case UnqualifiedId::IK_ConversionFunctionId: 1779 // The result type of a conversion function is the type that it 1780 // converts to. 1781 T = SemaRef.GetTypeFromParser(D.getName().ConversionFunctionId, 1782 &ReturnTypeInfo); 1783 break; 1784 } 1785 1786 if (D.getAttributes()) 1787 distributeTypeAttrsFromDeclarator(state, T); 1788 1789 // C++0x [dcl.spec.auto]p5: reject 'auto' if it is not in an allowed context. 1790 // In C++0x, a function declarator using 'auto' must have a trailing return 1791 // type (this is checked later) and we can skip this. In other languages 1792 // using auto, we need to check regardless. 1793 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto && 1794 (!SemaRef.getLangOptions().CPlusPlus0x || !D.isFunctionDeclarator())) { 1795 int Error = -1; 1796 1797 switch (D.getContext()) { 1798 case Declarator::KNRTypeListContext: 1799 llvm_unreachable("K&R type lists aren't allowed in C++"); 1800 case Declarator::LambdaExprContext: 1801 llvm_unreachable("Can't specify a type specifier in lambda grammar"); 1802 case Declarator::ObjCParameterContext: 1803 case Declarator::ObjCResultContext: 1804 case Declarator::PrototypeContext: 1805 Error = 0; // Function prototype 1806 break; 1807 case Declarator::MemberContext: 1808 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_static) 1809 break; 1810 switch (cast<TagDecl>(SemaRef.CurContext)->getTagKind()) { 1811 case TTK_Enum: llvm_unreachable("unhandled tag kind"); 1812 case TTK_Struct: Error = 1; /* Struct member */ break; 1813 case TTK_Union: Error = 2; /* Union member */ break; 1814 case TTK_Class: Error = 3; /* Class member */ break; 1815 } 1816 break; 1817 case Declarator::CXXCatchContext: 1818 case Declarator::ObjCCatchContext: 1819 Error = 4; // Exception declaration 1820 break; 1821 case Declarator::TemplateParamContext: 1822 Error = 5; // Template parameter 1823 break; 1824 case Declarator::BlockLiteralContext: 1825 Error = 6; // Block literal 1826 break; 1827 case Declarator::TemplateTypeArgContext: 1828 Error = 7; // Template type argument 1829 break; 1830 case Declarator::AliasDeclContext: 1831 case Declarator::AliasTemplateContext: 1832 Error = 9; // Type alias 1833 break; 1834 case Declarator::TypeNameContext: 1835 Error = 11; // Generic 1836 break; 1837 case Declarator::FileContext: 1838 case Declarator::BlockContext: 1839 case Declarator::ForContext: 1840 case Declarator::ConditionContext: 1841 case Declarator::CXXNewContext: 1842 break; 1843 } 1844 1845 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 1846 Error = 8; 1847 1848 // In Objective-C it is an error to use 'auto' on a function declarator. 1849 if (D.isFunctionDeclarator()) 1850 Error = 10; 1851 1852 // C++0x [dcl.spec.auto]p2: 'auto' is always fine if the declarator 1853 // contains a trailing return type. That is only legal at the outermost 1854 // level. Check all declarator chunks (outermost first) anyway, to give 1855 // better diagnostics. 1856 if (SemaRef.getLangOptions().CPlusPlus0x && Error != -1) { 1857 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 1858 unsigned chunkIndex = e - i - 1; 1859 state.setCurrentChunkIndex(chunkIndex); 1860 DeclaratorChunk &DeclType = D.getTypeObject(chunkIndex); 1861 if (DeclType.Kind == DeclaratorChunk::Function) { 1862 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun; 1863 if (FTI.TrailingReturnType) { 1864 Error = -1; 1865 break; 1866 } 1867 } 1868 } 1869 } 1870 1871 if (Error != -1) { 1872 SemaRef.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 1873 diag::err_auto_not_allowed) 1874 << Error; 1875 T = SemaRef.Context.IntTy; 1876 D.setInvalidType(true); 1877 } else 1878 SemaRef.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 1879 diag::warn_cxx98_compat_auto_type_specifier); 1880 } 1881 1882 if (SemaRef.getLangOptions().CPlusPlus && 1883 OwnedTagDecl && OwnedTagDecl->isCompleteDefinition()) { 1884 // Check the contexts where C++ forbids the declaration of a new class 1885 // or enumeration in a type-specifier-seq. 1886 switch (D.getContext()) { 1887 case Declarator::FileContext: 1888 case Declarator::MemberContext: 1889 case Declarator::BlockContext: 1890 case Declarator::ForContext: 1891 case Declarator::BlockLiteralContext: 1892 case Declarator::LambdaExprContext: 1893 // C++0x [dcl.type]p3: 1894 // A type-specifier-seq shall not define a class or enumeration unless 1895 // it appears in the type-id of an alias-declaration (7.1.3) that is not 1896 // the declaration of a template-declaration. 1897 case Declarator::AliasDeclContext: 1898 break; 1899 case Declarator::AliasTemplateContext: 1900 SemaRef.Diag(OwnedTagDecl->getLocation(), 1901 diag::err_type_defined_in_alias_template) 1902 << SemaRef.Context.getTypeDeclType(OwnedTagDecl); 1903 break; 1904 case Declarator::TypeNameContext: 1905 case Declarator::TemplateParamContext: 1906 case Declarator::CXXNewContext: 1907 case Declarator::CXXCatchContext: 1908 case Declarator::ObjCCatchContext: 1909 case Declarator::TemplateTypeArgContext: 1910 SemaRef.Diag(OwnedTagDecl->getLocation(), 1911 diag::err_type_defined_in_type_specifier) 1912 << SemaRef.Context.getTypeDeclType(OwnedTagDecl); 1913 break; 1914 case Declarator::PrototypeContext: 1915 case Declarator::ObjCParameterContext: 1916 case Declarator::ObjCResultContext: 1917 case Declarator::KNRTypeListContext: 1918 // C++ [dcl.fct]p6: 1919 // Types shall not be defined in return or parameter types. 1920 SemaRef.Diag(OwnedTagDecl->getLocation(), 1921 diag::err_type_defined_in_param_type) 1922 << SemaRef.Context.getTypeDeclType(OwnedTagDecl); 1923 break; 1924 case Declarator::ConditionContext: 1925 // C++ 6.4p2: 1926 // The type-specifier-seq shall not contain typedef and shall not declare 1927 // a new class or enumeration. 1928 SemaRef.Diag(OwnedTagDecl->getLocation(), 1929 diag::err_type_defined_in_condition); 1930 break; 1931 } 1932 } 1933 1934 return T; 1935} 1936 1937static TypeSourceInfo *GetFullTypeForDeclarator(TypeProcessingState &state, 1938 QualType declSpecType, 1939 TypeSourceInfo *TInfo) { 1940 1941 QualType T = declSpecType; 1942 Declarator &D = state.getDeclarator(); 1943 Sema &S = state.getSema(); 1944 ASTContext &Context = S.Context; 1945 const LangOptions &LangOpts = S.getLangOptions(); 1946 1947 bool ImplicitlyNoexcept = false; 1948 if (D.getName().getKind() == UnqualifiedId::IK_OperatorFunctionId && 1949 LangOpts.CPlusPlus0x) { 1950 OverloadedOperatorKind OO = D.getName().OperatorFunctionId.Operator; 1951 /// In C++0x, deallocation functions (normal and array operator delete) 1952 /// are implicitly noexcept. 1953 if (OO == OO_Delete || OO == OO_Array_Delete) 1954 ImplicitlyNoexcept = true; 1955 } 1956 1957 // The name we're declaring, if any. 1958 DeclarationName Name; 1959 if (D.getIdentifier()) 1960 Name = D.getIdentifier(); 1961 1962 // Does this declaration declare a typedef-name? 1963 bool IsTypedefName = 1964 D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef || 1965 D.getContext() == Declarator::AliasDeclContext || 1966 D.getContext() == Declarator::AliasTemplateContext; 1967 1968 // Walk the DeclTypeInfo, building the recursive type as we go. 1969 // DeclTypeInfos are ordered from the identifier out, which is 1970 // opposite of what we want :). 1971 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 1972 unsigned chunkIndex = e - i - 1; 1973 state.setCurrentChunkIndex(chunkIndex); 1974 DeclaratorChunk &DeclType = D.getTypeObject(chunkIndex); 1975 switch (DeclType.Kind) { 1976 case DeclaratorChunk::Paren: 1977 T = S.BuildParenType(T); 1978 break; 1979 case DeclaratorChunk::BlockPointer: 1980 // If blocks are disabled, emit an error. 1981 if (!LangOpts.Blocks) 1982 S.Diag(DeclType.Loc, diag::err_blocks_disable); 1983 1984 T = S.BuildBlockPointerType(T, D.getIdentifierLoc(), Name); 1985 if (DeclType.Cls.TypeQuals) 1986 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Cls.TypeQuals); 1987 break; 1988 case DeclaratorChunk::Pointer: 1989 // Verify that we're not building a pointer to pointer to function with 1990 // exception specification. 1991 if (LangOpts.CPlusPlus && S.CheckDistantExceptionSpec(T)) { 1992 S.Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 1993 D.setInvalidType(true); 1994 // Build the type anyway. 1995 } 1996 if (LangOpts.ObjC1 && T->getAs<ObjCObjectType>()) { 1997 T = Context.getObjCObjectPointerType(T); 1998 if (DeclType.Ptr.TypeQuals) 1999 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Ptr.TypeQuals); 2000 break; 2001 } 2002 T = S.BuildPointerType(T, DeclType.Loc, Name); 2003 if (DeclType.Ptr.TypeQuals) 2004 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Ptr.TypeQuals); 2005 2006 break; 2007 case DeclaratorChunk::Reference: { 2008 // Verify that we're not building a reference to pointer to function with 2009 // exception specification. 2010 if (LangOpts.CPlusPlus && S.CheckDistantExceptionSpec(T)) { 2011 S.Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 2012 D.setInvalidType(true); 2013 // Build the type anyway. 2014 } 2015 T = S.BuildReferenceType(T, DeclType.Ref.LValueRef, DeclType.Loc, Name); 2016 2017 Qualifiers Quals; 2018 if (DeclType.Ref.HasRestrict) 2019 T = S.BuildQualifiedType(T, DeclType.Loc, Qualifiers::Restrict); 2020 break; 2021 } 2022 case DeclaratorChunk::Array: { 2023 // Verify that we're not building an array of pointers to function with 2024 // exception specification. 2025 if (LangOpts.CPlusPlus && S.CheckDistantExceptionSpec(T)) { 2026 S.Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 2027 D.setInvalidType(true); 2028 // Build the type anyway. 2029 } 2030 DeclaratorChunk::ArrayTypeInfo &ATI = DeclType.Arr; 2031 Expr *ArraySize = static_cast<Expr*>(ATI.NumElts); 2032 ArrayType::ArraySizeModifier ASM; 2033 if (ATI.isStar) 2034 ASM = ArrayType::Star; 2035 else if (ATI.hasStatic) 2036 ASM = ArrayType::Static; 2037 else 2038 ASM = ArrayType::Normal; 2039 if (ASM == ArrayType::Star && !D.isPrototypeContext()) { 2040 // FIXME: This check isn't quite right: it allows star in prototypes 2041 // for function definitions, and disallows some edge cases detailed 2042 // in http://gcc.gnu.org/ml/gcc-patches/2009-02/msg00133.html 2043 S.Diag(DeclType.Loc, diag::err_array_star_outside_prototype); 2044 ASM = ArrayType::Normal; 2045 D.setInvalidType(true); 2046 } 2047 T = S.BuildArrayType(T, ASM, ArraySize, ATI.TypeQuals, 2048 SourceRange(DeclType.Loc, DeclType.EndLoc), Name); 2049 break; 2050 } 2051 case DeclaratorChunk::Function: { 2052 // If the function declarator has a prototype (i.e. it is not () and 2053 // does not have a K&R-style identifier list), then the arguments are part 2054 // of the type, otherwise the argument list is (). 2055 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun; 2056 2057 // Check for auto functions and trailing return type and adjust the 2058 // return type accordingly. 2059 if (!D.isInvalidType()) { 2060 // trailing-return-type is only required if we're declaring a function, 2061 // and not, for instance, a pointer to a function. 2062 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto && 2063 !FTI.TrailingReturnType && chunkIndex == 0) { 2064 S.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 2065 diag::err_auto_missing_trailing_return); 2066 T = Context.IntTy; 2067 D.setInvalidType(true); 2068 } else if (FTI.TrailingReturnType) { 2069 // T must be exactly 'auto' at this point. See CWG issue 681. 2070 if (isa<ParenType>(T)) { 2071 S.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 2072 diag::err_trailing_return_in_parens) 2073 << T << D.getDeclSpec().getSourceRange(); 2074 D.setInvalidType(true); 2075 } else if (D.getContext() != Declarator::LambdaExprContext && 2076 (T.hasQualifiers() || !isa<AutoType>(T))) { 2077 S.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 2078 diag::err_trailing_return_without_auto) 2079 << T << D.getDeclSpec().getSourceRange(); 2080 D.setInvalidType(true); 2081 } 2082 2083 T = S.GetTypeFromParser( 2084 ParsedType::getFromOpaquePtr(FTI.TrailingReturnType), 2085 &TInfo); 2086 } 2087 } 2088 2089 // C99 6.7.5.3p1: The return type may not be a function or array type. 2090 // For conversion functions, we'll diagnose this particular error later. 2091 if ((T->isArrayType() || T->isFunctionType()) && 2092 (D.getName().getKind() != UnqualifiedId::IK_ConversionFunctionId)) { 2093 unsigned diagID = diag::err_func_returning_array_function; 2094 // Last processing chunk in block context means this function chunk 2095 // represents the block. 2096 if (chunkIndex == 0 && 2097 D.getContext() == Declarator::BlockLiteralContext) 2098 diagID = diag::err_block_returning_array_function; 2099 S.Diag(DeclType.Loc, diagID) << T->isFunctionType() << T; 2100 T = Context.IntTy; 2101 D.setInvalidType(true); 2102 } 2103 2104 // Do not allow returning half FP value. 2105 // FIXME: This really should be in BuildFunctionType. 2106 if (T->isHalfType()) { 2107 S.Diag(D.getIdentifierLoc(), 2108 diag::err_parameters_retval_cannot_have_fp16_type) << 1 2109 << FixItHint::CreateInsertion(D.getIdentifierLoc(), "*"); 2110 D.setInvalidType(true); 2111 } 2112 2113 // cv-qualifiers on return types are pointless except when the type is a 2114 // class type in C++. 2115 if (isa<PointerType>(T) && T.getLocalCVRQualifiers() && 2116 (D.getName().getKind() != UnqualifiedId::IK_ConversionFunctionId) && 2117 (!LangOpts.CPlusPlus || !T->isDependentType())) { 2118 assert(chunkIndex + 1 < e && "No DeclaratorChunk for the return type?"); 2119 DeclaratorChunk ReturnTypeChunk = D.getTypeObject(chunkIndex + 1); 2120 assert(ReturnTypeChunk.Kind == DeclaratorChunk::Pointer); 2121 2122 DeclaratorChunk::PointerTypeInfo &PTI = ReturnTypeChunk.Ptr; 2123 2124 DiagnoseIgnoredQualifiers(PTI.TypeQuals, 2125 SourceLocation::getFromRawEncoding(PTI.ConstQualLoc), 2126 SourceLocation::getFromRawEncoding(PTI.VolatileQualLoc), 2127 SourceLocation::getFromRawEncoding(PTI.RestrictQualLoc), 2128 S); 2129 2130 } else if (T.getCVRQualifiers() && D.getDeclSpec().getTypeQualifiers() && 2131 (!LangOpts.CPlusPlus || 2132 (!T->isDependentType() && !T->isRecordType()))) { 2133 2134 DiagnoseIgnoredQualifiers(D.getDeclSpec().getTypeQualifiers(), 2135 D.getDeclSpec().getConstSpecLoc(), 2136 D.getDeclSpec().getVolatileSpecLoc(), 2137 D.getDeclSpec().getRestrictSpecLoc(), 2138 S); 2139 } 2140 2141 if (LangOpts.CPlusPlus && D.getDeclSpec().isTypeSpecOwned()) { 2142 // C++ [dcl.fct]p6: 2143 // Types shall not be defined in return or parameter types. 2144 TagDecl *Tag = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 2145 if (Tag->isCompleteDefinition()) 2146 S.Diag(Tag->getLocation(), diag::err_type_defined_in_result_type) 2147 << Context.getTypeDeclType(Tag); 2148 } 2149 2150 // Exception specs are not allowed in typedefs. Complain, but add it 2151 // anyway. 2152 if (IsTypedefName && FTI.getExceptionSpecType()) 2153 S.Diag(FTI.getExceptionSpecLoc(), diag::err_exception_spec_in_typedef) 2154 << (D.getContext() == Declarator::AliasDeclContext || 2155 D.getContext() == Declarator::AliasTemplateContext); 2156 2157 if (!FTI.NumArgs && !FTI.isVariadic && !LangOpts.CPlusPlus) { 2158 // Simple void foo(), where the incoming T is the result type. 2159 T = Context.getFunctionNoProtoType(T); 2160 } else { 2161 // We allow a zero-parameter variadic function in C if the 2162 // function is marked with the "overloadable" attribute. Scan 2163 // for this attribute now. 2164 if (!FTI.NumArgs && FTI.isVariadic && !LangOpts.CPlusPlus) { 2165 bool Overloadable = false; 2166 for (const AttributeList *Attrs = D.getAttributes(); 2167 Attrs; Attrs = Attrs->getNext()) { 2168 if (Attrs->getKind() == AttributeList::AT_overloadable) { 2169 Overloadable = true; 2170 break; 2171 } 2172 } 2173 2174 if (!Overloadable) 2175 S.Diag(FTI.getEllipsisLoc(), diag::err_ellipsis_first_arg); 2176 } 2177 2178 if (FTI.NumArgs && FTI.ArgInfo[0].Param == 0) { 2179 // C99 6.7.5.3p3: Reject int(x,y,z) when it's not a function 2180 // definition. 2181 S.Diag(FTI.ArgInfo[0].IdentLoc, diag::err_ident_list_in_fn_declaration); 2182 D.setInvalidType(true); 2183 break; 2184 } 2185 2186 FunctionProtoType::ExtProtoInfo EPI; 2187 EPI.Variadic = FTI.isVariadic; 2188 EPI.TypeQuals = FTI.TypeQuals; 2189 EPI.RefQualifier = !FTI.hasRefQualifier()? RQ_None 2190 : FTI.RefQualifierIsLValueRef? RQ_LValue 2191 : RQ_RValue; 2192 2193 // Otherwise, we have a function with an argument list that is 2194 // potentially variadic. 2195 SmallVector<QualType, 16> ArgTys; 2196 ArgTys.reserve(FTI.NumArgs); 2197 2198 SmallVector<bool, 16> ConsumedArguments; 2199 ConsumedArguments.reserve(FTI.NumArgs); 2200 bool HasAnyConsumedArguments = false; 2201 2202 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 2203 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 2204 QualType ArgTy = Param->getType(); 2205 assert(!ArgTy.isNull() && "Couldn't parse type?"); 2206 2207 // Adjust the parameter type. 2208 assert((ArgTy == Context.getAdjustedParameterType(ArgTy)) && 2209 "Unadjusted type?"); 2210 2211 // Look for 'void'. void is allowed only as a single argument to a 2212 // function with no other parameters (C99 6.7.5.3p10). We record 2213 // int(void) as a FunctionProtoType with an empty argument list. 2214 if (ArgTy->isVoidType()) { 2215 // If this is something like 'float(int, void)', reject it. 'void' 2216 // is an incomplete type (C99 6.2.5p19) and function decls cannot 2217 // have arguments of incomplete type. 2218 if (FTI.NumArgs != 1 || FTI.isVariadic) { 2219 S.Diag(DeclType.Loc, diag::err_void_only_param); 2220 ArgTy = Context.IntTy; 2221 Param->setType(ArgTy); 2222 } else if (FTI.ArgInfo[i].Ident) { 2223 // Reject, but continue to parse 'int(void abc)'. 2224 S.Diag(FTI.ArgInfo[i].IdentLoc, 2225 diag::err_param_with_void_type); 2226 ArgTy = Context.IntTy; 2227 Param->setType(ArgTy); 2228 } else { 2229 // Reject, but continue to parse 'float(const void)'. 2230 if (ArgTy.hasQualifiers()) 2231 S.Diag(DeclType.Loc, diag::err_void_param_qualified); 2232 2233 // Do not add 'void' to the ArgTys list. 2234 break; 2235 } 2236 } else if (ArgTy->isHalfType()) { 2237 // Disallow half FP arguments. 2238 // FIXME: This really should be in BuildFunctionType. 2239 S.Diag(Param->getLocation(), 2240 diag::err_parameters_retval_cannot_have_fp16_type) << 0 2241 << FixItHint::CreateInsertion(Param->getLocation(), "*"); 2242 D.setInvalidType(); 2243 } else if (!FTI.hasPrototype) { 2244 if (ArgTy->isPromotableIntegerType()) { 2245 ArgTy = Context.getPromotedIntegerType(ArgTy); 2246 Param->setKNRPromoted(true); 2247 } else if (const BuiltinType* BTy = ArgTy->getAs<BuiltinType>()) { 2248 if (BTy->getKind() == BuiltinType::Float) { 2249 ArgTy = Context.DoubleTy; 2250 Param->setKNRPromoted(true); 2251 } 2252 } 2253 } 2254 2255 if (LangOpts.ObjCAutoRefCount) { 2256 bool Consumed = Param->hasAttr<NSConsumedAttr>(); 2257 ConsumedArguments.push_back(Consumed); 2258 HasAnyConsumedArguments |= Consumed; 2259 } 2260 2261 ArgTys.push_back(ArgTy); 2262 } 2263 2264 if (HasAnyConsumedArguments) 2265 EPI.ConsumedArguments = ConsumedArguments.data(); 2266 2267 SmallVector<QualType, 4> Exceptions; 2268 EPI.ExceptionSpecType = FTI.getExceptionSpecType(); 2269 if (FTI.getExceptionSpecType() == EST_Dynamic) { 2270 Exceptions.reserve(FTI.NumExceptions); 2271 for (unsigned ei = 0, ee = FTI.NumExceptions; ei != ee; ++ei) { 2272 // FIXME: Preserve type source info. 2273 QualType ET = S.GetTypeFromParser(FTI.Exceptions[ei].Ty); 2274 // Check that the type is valid for an exception spec, and 2275 // drop it if not. 2276 if (!S.CheckSpecifiedExceptionType(ET, FTI.Exceptions[ei].Range)) 2277 Exceptions.push_back(ET); 2278 } 2279 EPI.NumExceptions = Exceptions.size(); 2280 EPI.Exceptions = Exceptions.data(); 2281 } else if (FTI.getExceptionSpecType() == EST_ComputedNoexcept) { 2282 // If an error occurred, there's no expression here. 2283 if (Expr *NoexceptExpr = FTI.NoexceptExpr) { 2284 assert((NoexceptExpr->isTypeDependent() || 2285 NoexceptExpr->getType()->getCanonicalTypeUnqualified() == 2286 Context.BoolTy) && 2287 "Parser should have made sure that the expression is boolean"); 2288 if (!NoexceptExpr->isValueDependent()) 2289 NoexceptExpr = S.VerifyIntegerConstantExpression(NoexceptExpr, 0, 2290 S.PDiag(diag::err_noexcept_needs_constant_expression), 2291 /*AllowFold*/ false).take(); 2292 EPI.NoexceptExpr = NoexceptExpr; 2293 } 2294 } else if (FTI.getExceptionSpecType() == EST_None && 2295 ImplicitlyNoexcept && chunkIndex == 0) { 2296 // Only the outermost chunk is marked noexcept, of course. 2297 EPI.ExceptionSpecType = EST_BasicNoexcept; 2298 } 2299 2300 T = Context.getFunctionType(T, ArgTys.data(), ArgTys.size(), EPI); 2301 } 2302 2303 break; 2304 } 2305 case DeclaratorChunk::MemberPointer: 2306 // The scope spec must refer to a class, or be dependent. 2307 CXXScopeSpec &SS = DeclType.Mem.Scope(); 2308 QualType ClsType; 2309 if (SS.isInvalid()) { 2310 // Avoid emitting extra errors if we already errored on the scope. 2311 D.setInvalidType(true); 2312 } else if (S.isDependentScopeSpecifier(SS) || 2313 dyn_cast_or_null<CXXRecordDecl>(S.computeDeclContext(SS))) { 2314 NestedNameSpecifier *NNS 2315 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 2316 NestedNameSpecifier *NNSPrefix = NNS->getPrefix(); 2317 switch (NNS->getKind()) { 2318 case NestedNameSpecifier::Identifier: 2319 ClsType = Context.getDependentNameType(ETK_None, NNSPrefix, 2320 NNS->getAsIdentifier()); 2321 break; 2322 2323 case NestedNameSpecifier::Namespace: 2324 case NestedNameSpecifier::NamespaceAlias: 2325 case NestedNameSpecifier::Global: 2326 llvm_unreachable("Nested-name-specifier must name a type"); 2327 2328 case NestedNameSpecifier::TypeSpec: 2329 case NestedNameSpecifier::TypeSpecWithTemplate: 2330 ClsType = QualType(NNS->getAsType(), 0); 2331 // Note: if the NNS has a prefix and ClsType is a nondependent 2332 // TemplateSpecializationType, then the NNS prefix is NOT included 2333 // in ClsType; hence we wrap ClsType into an ElaboratedType. 2334 // NOTE: in particular, no wrap occurs if ClsType already is an 2335 // Elaborated, DependentName, or DependentTemplateSpecialization. 2336 if (NNSPrefix && isa<TemplateSpecializationType>(NNS->getAsType())) 2337 ClsType = Context.getElaboratedType(ETK_None, NNSPrefix, ClsType); 2338 break; 2339 } 2340 } else { 2341 S.Diag(DeclType.Mem.Scope().getBeginLoc(), 2342 diag::err_illegal_decl_mempointer_in_nonclass) 2343 << (D.getIdentifier() ? D.getIdentifier()->getName() : "type name") 2344 << DeclType.Mem.Scope().getRange(); 2345 D.setInvalidType(true); 2346 } 2347 2348 if (!ClsType.isNull()) 2349 T = S.BuildMemberPointerType(T, ClsType, DeclType.Loc, D.getIdentifier()); 2350 if (T.isNull()) { 2351 T = Context.IntTy; 2352 D.setInvalidType(true); 2353 } else if (DeclType.Mem.TypeQuals) { 2354 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Mem.TypeQuals); 2355 } 2356 break; 2357 } 2358 2359 if (T.isNull()) { 2360 D.setInvalidType(true); 2361 T = Context.IntTy; 2362 } 2363 2364 // See if there are any attributes on this declarator chunk. 2365 if (AttributeList *attrs = const_cast<AttributeList*>(DeclType.getAttrs())) 2366 processTypeAttrs(state, T, false, attrs); 2367 } 2368 2369 if (LangOpts.CPlusPlus && T->isFunctionType()) { 2370 const FunctionProtoType *FnTy = T->getAs<FunctionProtoType>(); 2371 assert(FnTy && "Why oh why is there not a FunctionProtoType here?"); 2372 2373 // C++ 8.3.5p4: 2374 // A cv-qualifier-seq shall only be part of the function type 2375 // for a nonstatic member function, the function type to which a pointer 2376 // to member refers, or the top-level function type of a function typedef 2377 // declaration. 2378 // 2379 // Core issue 547 also allows cv-qualifiers on function types that are 2380 // top-level template type arguments. 2381 bool FreeFunction; 2382 if (!D.getCXXScopeSpec().isSet()) { 2383 FreeFunction = ((D.getContext() != Declarator::MemberContext && 2384 D.getContext() != Declarator::LambdaExprContext) || 2385 D.getDeclSpec().isFriendSpecified()); 2386 } else { 2387 DeclContext *DC = S.computeDeclContext(D.getCXXScopeSpec()); 2388 FreeFunction = (DC && !DC->isRecord()); 2389 } 2390 2391 // C++0x [dcl.constexpr]p8: A constexpr specifier for a non-static member 2392 // function that is not a constructor declares that function to be const. 2393 if (D.getDeclSpec().isConstexprSpecified() && !FreeFunction && 2394 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static && 2395 D.getName().getKind() != UnqualifiedId::IK_ConstructorName && 2396 D.getName().getKind() != UnqualifiedId::IK_ConstructorTemplateId && 2397 !(FnTy->getTypeQuals() & DeclSpec::TQ_const)) { 2398 // Rebuild function type adding a 'const' qualifier. 2399 FunctionProtoType::ExtProtoInfo EPI = FnTy->getExtProtoInfo(); 2400 EPI.TypeQuals |= DeclSpec::TQ_const; 2401 T = Context.getFunctionType(FnTy->getResultType(), 2402 FnTy->arg_type_begin(), 2403 FnTy->getNumArgs(), EPI); 2404 } 2405 2406 // C++0x [dcl.fct]p6: 2407 // A ref-qualifier shall only be part of the function type for a 2408 // non-static member function, the function type to which a pointer to 2409 // member refers, or the top-level function type of a function typedef 2410 // declaration. 2411 if ((FnTy->getTypeQuals() != 0 || FnTy->getRefQualifier()) && 2412 !(D.getContext() == Declarator::TemplateTypeArgContext && 2413 !D.isFunctionDeclarator()) && !IsTypedefName && 2414 (FreeFunction || 2415 D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_static)) { 2416 if (D.getContext() == Declarator::TemplateTypeArgContext) { 2417 // Accept qualified function types as template type arguments as a GNU 2418 // extension. This is also the subject of C++ core issue 547. 2419 std::string Quals; 2420 if (FnTy->getTypeQuals() != 0) 2421 Quals = Qualifiers::fromCVRMask(FnTy->getTypeQuals()).getAsString(); 2422 2423 switch (FnTy->getRefQualifier()) { 2424 case RQ_None: 2425 break; 2426 2427 case RQ_LValue: 2428 if (!Quals.empty()) 2429 Quals += ' '; 2430 Quals += '&'; 2431 break; 2432 2433 case RQ_RValue: 2434 if (!Quals.empty()) 2435 Quals += ' '; 2436 Quals += "&&"; 2437 break; 2438 } 2439 2440 S.Diag(D.getIdentifierLoc(), 2441 diag::ext_qualified_function_type_template_arg) 2442 << Quals; 2443 } else { 2444 if (FnTy->getTypeQuals() != 0) { 2445 if (D.isFunctionDeclarator()) { 2446 SourceRange Range = D.getIdentifierLoc(); 2447 for (unsigned I = 0, N = D.getNumTypeObjects(); I != N; ++I) { 2448 const DeclaratorChunk &Chunk = D.getTypeObject(N-I-1); 2449 if (Chunk.Kind == DeclaratorChunk::Function && 2450 Chunk.Fun.TypeQuals != 0) { 2451 switch (Chunk.Fun.TypeQuals) { 2452 case Qualifiers::Const: 2453 Range = Chunk.Fun.getConstQualifierLoc(); 2454 break; 2455 case Qualifiers::Volatile: 2456 Range = Chunk.Fun.getVolatileQualifierLoc(); 2457 break; 2458 case Qualifiers::Const | Qualifiers::Volatile: { 2459 SourceLocation CLoc = Chunk.Fun.getConstQualifierLoc(); 2460 SourceLocation VLoc = Chunk.Fun.getVolatileQualifierLoc(); 2461 if (S.getSourceManager() 2462 .isBeforeInTranslationUnit(CLoc, VLoc)) { 2463 Range = SourceRange(CLoc, VLoc); 2464 } else { 2465 Range = SourceRange(VLoc, CLoc); 2466 } 2467 } 2468 break; 2469 } 2470 break; 2471 } 2472 } 2473 S.Diag(Range.getBegin(), diag::err_invalid_qualified_function_type) 2474 << FixItHint::CreateRemoval(Range); 2475 } else 2476 S.Diag(D.getIdentifierLoc(), 2477 diag::err_invalid_qualified_typedef_function_type_use) 2478 << FreeFunction; 2479 } 2480 2481 if (FnTy->getRefQualifier()) { 2482 if (D.isFunctionDeclarator()) { 2483 SourceLocation Loc = D.getIdentifierLoc(); 2484 for (unsigned I = 0, N = D.getNumTypeObjects(); I != N; ++I) { 2485 const DeclaratorChunk &Chunk = D.getTypeObject(N-I-1); 2486 if (Chunk.Kind == DeclaratorChunk::Function && 2487 Chunk.Fun.hasRefQualifier()) { 2488 Loc = Chunk.Fun.getRefQualifierLoc(); 2489 break; 2490 } 2491 } 2492 2493 S.Diag(Loc, diag::err_invalid_ref_qualifier_function_type) 2494 << (FnTy->getRefQualifier() == RQ_LValue) 2495 << FixItHint::CreateRemoval(Loc); 2496 } else { 2497 S.Diag(D.getIdentifierLoc(), 2498 diag::err_invalid_ref_qualifier_typedef_function_type_use) 2499 << FreeFunction 2500 << (FnTy->getRefQualifier() == RQ_LValue); 2501 } 2502 } 2503 2504 // Strip the cv-qualifiers and ref-qualifiers from the type. 2505 FunctionProtoType::ExtProtoInfo EPI = FnTy->getExtProtoInfo(); 2506 EPI.TypeQuals = 0; 2507 EPI.RefQualifier = RQ_None; 2508 2509 T = Context.getFunctionType(FnTy->getResultType(), 2510 FnTy->arg_type_begin(), 2511 FnTy->getNumArgs(), EPI); 2512 } 2513 } 2514 } 2515 2516 // Apply any undistributed attributes from the declarator. 2517 if (!T.isNull()) 2518 if (AttributeList *attrs = D.getAttributes()) 2519 processTypeAttrs(state, T, false, attrs); 2520 2521 // Diagnose any ignored type attributes. 2522 if (!T.isNull()) state.diagnoseIgnoredTypeAttrs(T); 2523 2524 // C++0x [dcl.constexpr]p9: 2525 // A constexpr specifier used in an object declaration declares the object 2526 // as const. 2527 if (D.getDeclSpec().isConstexprSpecified() && T->isObjectType()) { 2528 T.addConst(); 2529 } 2530 2531 // If there was an ellipsis in the declarator, the declaration declares a 2532 // parameter pack whose type may be a pack expansion type. 2533 if (D.hasEllipsis() && !T.isNull()) { 2534 // C++0x [dcl.fct]p13: 2535 // A declarator-id or abstract-declarator containing an ellipsis shall 2536 // only be used in a parameter-declaration. Such a parameter-declaration 2537 // is a parameter pack (14.5.3). [...] 2538 switch (D.getContext()) { 2539 case Declarator::PrototypeContext: 2540 // C++0x [dcl.fct]p13: 2541 // [...] When it is part of a parameter-declaration-clause, the 2542 // parameter pack is a function parameter pack (14.5.3). The type T 2543 // of the declarator-id of the function parameter pack shall contain 2544 // a template parameter pack; each template parameter pack in T is 2545 // expanded by the function parameter pack. 2546 // 2547 // We represent function parameter packs as function parameters whose 2548 // type is a pack expansion. 2549 if (!T->containsUnexpandedParameterPack()) { 2550 S.Diag(D.getEllipsisLoc(), 2551 diag::err_function_parameter_pack_without_parameter_packs) 2552 << T << D.getSourceRange(); 2553 D.setEllipsisLoc(SourceLocation()); 2554 } else { 2555 T = Context.getPackExpansionType(T, llvm::Optional<unsigned>()); 2556 } 2557 break; 2558 2559 case Declarator::TemplateParamContext: 2560 // C++0x [temp.param]p15: 2561 // If a template-parameter is a [...] is a parameter-declaration that 2562 // declares a parameter pack (8.3.5), then the template-parameter is a 2563 // template parameter pack (14.5.3). 2564 // 2565 // Note: core issue 778 clarifies that, if there are any unexpanded 2566 // parameter packs in the type of the non-type template parameter, then 2567 // it expands those parameter packs. 2568 if (T->containsUnexpandedParameterPack()) 2569 T = Context.getPackExpansionType(T, llvm::Optional<unsigned>()); 2570 else 2571 S.Diag(D.getEllipsisLoc(), 2572 LangOpts.CPlusPlus0x 2573 ? diag::warn_cxx98_compat_variadic_templates 2574 : diag::ext_variadic_templates); 2575 break; 2576 2577 case Declarator::FileContext: 2578 case Declarator::KNRTypeListContext: 2579 case Declarator::ObjCParameterContext: // FIXME: special diagnostic here? 2580 case Declarator::ObjCResultContext: // FIXME: special diagnostic here? 2581 case Declarator::TypeNameContext: 2582 case Declarator::CXXNewContext: 2583 case Declarator::AliasDeclContext: 2584 case Declarator::AliasTemplateContext: 2585 case Declarator::MemberContext: 2586 case Declarator::BlockContext: 2587 case Declarator::ForContext: 2588 case Declarator::ConditionContext: 2589 case Declarator::CXXCatchContext: 2590 case Declarator::ObjCCatchContext: 2591 case Declarator::BlockLiteralContext: 2592 case Declarator::LambdaExprContext: 2593 case Declarator::TemplateTypeArgContext: 2594 // FIXME: We may want to allow parameter packs in block-literal contexts 2595 // in the future. 2596 S.Diag(D.getEllipsisLoc(), diag::err_ellipsis_in_declarator_not_parameter); 2597 D.setEllipsisLoc(SourceLocation()); 2598 break; 2599 } 2600 } 2601 2602 if (T.isNull()) 2603 return Context.getNullTypeSourceInfo(); 2604 else if (D.isInvalidType()) 2605 return Context.getTrivialTypeSourceInfo(T); 2606 2607 return S.GetTypeSourceInfoForDeclarator(D, T, TInfo); 2608} 2609 2610/// GetTypeForDeclarator - Convert the type for the specified 2611/// declarator to Type instances. 2612/// 2613/// The result of this call will never be null, but the associated 2614/// type may be a null type if there's an unrecoverable error. 2615TypeSourceInfo *Sema::GetTypeForDeclarator(Declarator &D, Scope *S) { 2616 // Determine the type of the declarator. Not all forms of declarator 2617 // have a type. 2618 2619 TypeProcessingState state(*this, D); 2620 2621 TypeSourceInfo *ReturnTypeInfo = 0; 2622 QualType T = GetDeclSpecTypeForDeclarator(state, ReturnTypeInfo); 2623 if (T.isNull()) 2624 return Context.getNullTypeSourceInfo(); 2625 2626 if (D.isPrototypeContext() && getLangOptions().ObjCAutoRefCount) 2627 inferARCWriteback(state, T); 2628 2629 return GetFullTypeForDeclarator(state, T, ReturnTypeInfo); 2630} 2631 2632static void transferARCOwnershipToDeclSpec(Sema &S, 2633 QualType &declSpecTy, 2634 Qualifiers::ObjCLifetime ownership) { 2635 if (declSpecTy->isObjCRetainableType() && 2636 declSpecTy.getObjCLifetime() == Qualifiers::OCL_None) { 2637 Qualifiers qs; 2638 qs.addObjCLifetime(ownership); 2639 declSpecTy = S.Context.getQualifiedType(declSpecTy, qs); 2640 } 2641} 2642 2643static void transferARCOwnershipToDeclaratorChunk(TypeProcessingState &state, 2644 Qualifiers::ObjCLifetime ownership, 2645 unsigned chunkIndex) { 2646 Sema &S = state.getSema(); 2647 Declarator &D = state.getDeclarator(); 2648 2649 // Look for an explicit lifetime attribute. 2650 DeclaratorChunk &chunk = D.getTypeObject(chunkIndex); 2651 for (const AttributeList *attr = chunk.getAttrs(); attr; 2652 attr = attr->getNext()) 2653 if (attr->getKind() == AttributeList::AT_objc_ownership) 2654 return; 2655 2656 const char *attrStr = 0; 2657 switch (ownership) { 2658 case Qualifiers::OCL_None: llvm_unreachable("no ownership!"); 2659 case Qualifiers::OCL_ExplicitNone: attrStr = "none"; break; 2660 case Qualifiers::OCL_Strong: attrStr = "strong"; break; 2661 case Qualifiers::OCL_Weak: attrStr = "weak"; break; 2662 case Qualifiers::OCL_Autoreleasing: attrStr = "autoreleasing"; break; 2663 } 2664 2665 // If there wasn't one, add one (with an invalid source location 2666 // so that we don't make an AttributedType for it). 2667 AttributeList *attr = D.getAttributePool() 2668 .create(&S.Context.Idents.get("objc_ownership"), SourceLocation(), 2669 /*scope*/ 0, SourceLocation(), 2670 &S.Context.Idents.get(attrStr), SourceLocation(), 2671 /*args*/ 0, 0, 2672 /*declspec*/ false, /*C++0x*/ false); 2673 spliceAttrIntoList(*attr, chunk.getAttrListRef()); 2674 2675 // TODO: mark whether we did this inference? 2676} 2677 2678/// \brief Used for transfering ownership in casts resulting in l-values. 2679static void transferARCOwnership(TypeProcessingState &state, 2680 QualType &declSpecTy, 2681 Qualifiers::ObjCLifetime ownership) { 2682 Sema &S = state.getSema(); 2683 Declarator &D = state.getDeclarator(); 2684 2685 int inner = -1; 2686 bool hasIndirection = false; 2687 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 2688 DeclaratorChunk &chunk = D.getTypeObject(i); 2689 switch (chunk.Kind) { 2690 case DeclaratorChunk::Paren: 2691 // Ignore parens. 2692 break; 2693 2694 case DeclaratorChunk::Array: 2695 case DeclaratorChunk::Reference: 2696 case DeclaratorChunk::Pointer: 2697 if (inner != -1) 2698 hasIndirection = true; 2699 inner = i; 2700 break; 2701 2702 case DeclaratorChunk::BlockPointer: 2703 if (inner != -1) 2704 transferARCOwnershipToDeclaratorChunk(state, ownership, i); 2705 return; 2706 2707 case DeclaratorChunk::Function: 2708 case DeclaratorChunk::MemberPointer: 2709 return; 2710 } 2711 } 2712 2713 if (inner == -1) 2714 return; 2715 2716 DeclaratorChunk &chunk = D.getTypeObject(inner); 2717 if (chunk.Kind == DeclaratorChunk::Pointer) { 2718 if (declSpecTy->isObjCRetainableType()) 2719 return transferARCOwnershipToDeclSpec(S, declSpecTy, ownership); 2720 if (declSpecTy->isObjCObjectType() && hasIndirection) 2721 return transferARCOwnershipToDeclaratorChunk(state, ownership, inner); 2722 } else { 2723 assert(chunk.Kind == DeclaratorChunk::Array || 2724 chunk.Kind == DeclaratorChunk::Reference); 2725 return transferARCOwnershipToDeclSpec(S, declSpecTy, ownership); 2726 } 2727} 2728 2729TypeSourceInfo *Sema::GetTypeForDeclaratorCast(Declarator &D, QualType FromTy) { 2730 TypeProcessingState state(*this, D); 2731 2732 TypeSourceInfo *ReturnTypeInfo = 0; 2733 QualType declSpecTy = GetDeclSpecTypeForDeclarator(state, ReturnTypeInfo); 2734 if (declSpecTy.isNull()) 2735 return Context.getNullTypeSourceInfo(); 2736 2737 if (getLangOptions().ObjCAutoRefCount) { 2738 Qualifiers::ObjCLifetime ownership = Context.getInnerObjCOwnership(FromTy); 2739 if (ownership != Qualifiers::OCL_None) 2740 transferARCOwnership(state, declSpecTy, ownership); 2741 } 2742 2743 return GetFullTypeForDeclarator(state, declSpecTy, ReturnTypeInfo); 2744} 2745 2746/// Map an AttributedType::Kind to an AttributeList::Kind. 2747static AttributeList::Kind getAttrListKind(AttributedType::Kind kind) { 2748 switch (kind) { 2749 case AttributedType::attr_address_space: 2750 return AttributeList::AT_address_space; 2751 case AttributedType::attr_regparm: 2752 return AttributeList::AT_regparm; 2753 case AttributedType::attr_vector_size: 2754 return AttributeList::AT_vector_size; 2755 case AttributedType::attr_neon_vector_type: 2756 return AttributeList::AT_neon_vector_type; 2757 case AttributedType::attr_neon_polyvector_type: 2758 return AttributeList::AT_neon_polyvector_type; 2759 case AttributedType::attr_objc_gc: 2760 return AttributeList::AT_objc_gc; 2761 case AttributedType::attr_objc_ownership: 2762 return AttributeList::AT_objc_ownership; 2763 case AttributedType::attr_noreturn: 2764 return AttributeList::AT_noreturn; 2765 case AttributedType::attr_cdecl: 2766 return AttributeList::AT_cdecl; 2767 case AttributedType::attr_fastcall: 2768 return AttributeList::AT_fastcall; 2769 case AttributedType::attr_stdcall: 2770 return AttributeList::AT_stdcall; 2771 case AttributedType::attr_thiscall: 2772 return AttributeList::AT_thiscall; 2773 case AttributedType::attr_pascal: 2774 return AttributeList::AT_pascal; 2775 case AttributedType::attr_pcs: 2776 return AttributeList::AT_pcs; 2777 } 2778 llvm_unreachable("unexpected attribute kind!"); 2779} 2780 2781static void fillAttributedTypeLoc(AttributedTypeLoc TL, 2782 const AttributeList *attrs) { 2783 AttributedType::Kind kind = TL.getAttrKind(); 2784 2785 assert(attrs && "no type attributes in the expected location!"); 2786 AttributeList::Kind parsedKind = getAttrListKind(kind); 2787 while (attrs->getKind() != parsedKind) { 2788 attrs = attrs->getNext(); 2789 assert(attrs && "no matching attribute in expected location!"); 2790 } 2791 2792 TL.setAttrNameLoc(attrs->getLoc()); 2793 if (TL.hasAttrExprOperand()) 2794 TL.setAttrExprOperand(attrs->getArg(0)); 2795 else if (TL.hasAttrEnumOperand()) 2796 TL.setAttrEnumOperandLoc(attrs->getParameterLoc()); 2797 2798 // FIXME: preserve this information to here. 2799 if (TL.hasAttrOperand()) 2800 TL.setAttrOperandParensRange(SourceRange()); 2801} 2802 2803namespace { 2804 class TypeSpecLocFiller : public TypeLocVisitor<TypeSpecLocFiller> { 2805 ASTContext &Context; 2806 const DeclSpec &DS; 2807 2808 public: 2809 TypeSpecLocFiller(ASTContext &Context, const DeclSpec &DS) 2810 : Context(Context), DS(DS) {} 2811 2812 void VisitAttributedTypeLoc(AttributedTypeLoc TL) { 2813 fillAttributedTypeLoc(TL, DS.getAttributes().getList()); 2814 Visit(TL.getModifiedLoc()); 2815 } 2816 void VisitQualifiedTypeLoc(QualifiedTypeLoc TL) { 2817 Visit(TL.getUnqualifiedLoc()); 2818 } 2819 void VisitTypedefTypeLoc(TypedefTypeLoc TL) { 2820 TL.setNameLoc(DS.getTypeSpecTypeLoc()); 2821 } 2822 void VisitObjCInterfaceTypeLoc(ObjCInterfaceTypeLoc TL) { 2823 TL.setNameLoc(DS.getTypeSpecTypeLoc()); 2824 } 2825 void VisitObjCObjectTypeLoc(ObjCObjectTypeLoc TL) { 2826 // Handle the base type, which might not have been written explicitly. 2827 if (DS.getTypeSpecType() == DeclSpec::TST_unspecified) { 2828 TL.setHasBaseTypeAsWritten(false); 2829 TL.getBaseLoc().initialize(Context, SourceLocation()); 2830 } else { 2831 TL.setHasBaseTypeAsWritten(true); 2832 Visit(TL.getBaseLoc()); 2833 } 2834 2835 // Protocol qualifiers. 2836 if (DS.getProtocolQualifiers()) { 2837 assert(TL.getNumProtocols() > 0); 2838 assert(TL.getNumProtocols() == DS.getNumProtocolQualifiers()); 2839 TL.setLAngleLoc(DS.getProtocolLAngleLoc()); 2840 TL.setRAngleLoc(DS.getSourceRange().getEnd()); 2841 for (unsigned i = 0, e = DS.getNumProtocolQualifiers(); i != e; ++i) 2842 TL.setProtocolLoc(i, DS.getProtocolLocs()[i]); 2843 } else { 2844 assert(TL.getNumProtocols() == 0); 2845 TL.setLAngleLoc(SourceLocation()); 2846 TL.setRAngleLoc(SourceLocation()); 2847 } 2848 } 2849 void VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL) { 2850 TL.setStarLoc(SourceLocation()); 2851 Visit(TL.getPointeeLoc()); 2852 } 2853 void VisitTemplateSpecializationTypeLoc(TemplateSpecializationTypeLoc TL) { 2854 TypeSourceInfo *TInfo = 0; 2855 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 2856 2857 // If we got no declarator info from previous Sema routines, 2858 // just fill with the typespec loc. 2859 if (!TInfo) { 2860 TL.initialize(Context, DS.getTypeSpecTypeNameLoc()); 2861 return; 2862 } 2863 2864 TypeLoc OldTL = TInfo->getTypeLoc(); 2865 if (TInfo->getType()->getAs<ElaboratedType>()) { 2866 ElaboratedTypeLoc ElabTL = cast<ElaboratedTypeLoc>(OldTL); 2867 TemplateSpecializationTypeLoc NamedTL = 2868 cast<TemplateSpecializationTypeLoc>(ElabTL.getNamedTypeLoc()); 2869 TL.copy(NamedTL); 2870 } 2871 else 2872 TL.copy(cast<TemplateSpecializationTypeLoc>(OldTL)); 2873 } 2874 void VisitTypeOfExprTypeLoc(TypeOfExprTypeLoc TL) { 2875 assert(DS.getTypeSpecType() == DeclSpec::TST_typeofExpr); 2876 TL.setTypeofLoc(DS.getTypeSpecTypeLoc()); 2877 TL.setParensRange(DS.getTypeofParensRange()); 2878 } 2879 void VisitTypeOfTypeLoc(TypeOfTypeLoc TL) { 2880 assert(DS.getTypeSpecType() == DeclSpec::TST_typeofType); 2881 TL.setTypeofLoc(DS.getTypeSpecTypeLoc()); 2882 TL.setParensRange(DS.getTypeofParensRange()); 2883 assert(DS.getRepAsType()); 2884 TypeSourceInfo *TInfo = 0; 2885 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 2886 TL.setUnderlyingTInfo(TInfo); 2887 } 2888 void VisitUnaryTransformTypeLoc(UnaryTransformTypeLoc TL) { 2889 // FIXME: This holds only because we only have one unary transform. 2890 assert(DS.getTypeSpecType() == DeclSpec::TST_underlyingType); 2891 TL.setKWLoc(DS.getTypeSpecTypeLoc()); 2892 TL.setParensRange(DS.getTypeofParensRange()); 2893 assert(DS.getRepAsType()); 2894 TypeSourceInfo *TInfo = 0; 2895 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 2896 TL.setUnderlyingTInfo(TInfo); 2897 } 2898 void VisitBuiltinTypeLoc(BuiltinTypeLoc TL) { 2899 // By default, use the source location of the type specifier. 2900 TL.setBuiltinLoc(DS.getTypeSpecTypeLoc()); 2901 if (TL.needsExtraLocalData()) { 2902 // Set info for the written builtin specifiers. 2903 TL.getWrittenBuiltinSpecs() = DS.getWrittenBuiltinSpecs(); 2904 // Try to have a meaningful source location. 2905 if (TL.getWrittenSignSpec() != TSS_unspecified) 2906 // Sign spec loc overrides the others (e.g., 'unsigned long'). 2907 TL.setBuiltinLoc(DS.getTypeSpecSignLoc()); 2908 else if (TL.getWrittenWidthSpec() != TSW_unspecified) 2909 // Width spec loc overrides type spec loc (e.g., 'short int'). 2910 TL.setBuiltinLoc(DS.getTypeSpecWidthLoc()); 2911 } 2912 } 2913 void VisitElaboratedTypeLoc(ElaboratedTypeLoc TL) { 2914 ElaboratedTypeKeyword Keyword 2915 = TypeWithKeyword::getKeywordForTypeSpec(DS.getTypeSpecType()); 2916 if (DS.getTypeSpecType() == TST_typename) { 2917 TypeSourceInfo *TInfo = 0; 2918 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 2919 if (TInfo) { 2920 TL.copy(cast<ElaboratedTypeLoc>(TInfo->getTypeLoc())); 2921 return; 2922 } 2923 } 2924 TL.setElaboratedKeywordLoc(Keyword != ETK_None 2925 ? DS.getTypeSpecTypeLoc() 2926 : SourceLocation()); 2927 const CXXScopeSpec& SS = DS.getTypeSpecScope(); 2928 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 2929 Visit(TL.getNextTypeLoc().getUnqualifiedLoc()); 2930 } 2931 void VisitDependentNameTypeLoc(DependentNameTypeLoc TL) { 2932 assert(DS.getTypeSpecType() == TST_typename); 2933 TypeSourceInfo *TInfo = 0; 2934 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 2935 assert(TInfo); 2936 TL.copy(cast<DependentNameTypeLoc>(TInfo->getTypeLoc())); 2937 } 2938 void VisitDependentTemplateSpecializationTypeLoc( 2939 DependentTemplateSpecializationTypeLoc TL) { 2940 assert(DS.getTypeSpecType() == TST_typename); 2941 TypeSourceInfo *TInfo = 0; 2942 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 2943 assert(TInfo); 2944 TL.copy(cast<DependentTemplateSpecializationTypeLoc>( 2945 TInfo->getTypeLoc())); 2946 } 2947 void VisitTagTypeLoc(TagTypeLoc TL) { 2948 TL.setNameLoc(DS.getTypeSpecTypeNameLoc()); 2949 } 2950 void VisitAtomicTypeLoc(AtomicTypeLoc TL) { 2951 TL.setKWLoc(DS.getTypeSpecTypeLoc()); 2952 TL.setParensRange(DS.getTypeofParensRange()); 2953 2954 TypeSourceInfo *TInfo = 0; 2955 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 2956 TL.getValueLoc().initializeFullCopy(TInfo->getTypeLoc()); 2957 } 2958 2959 void VisitTypeLoc(TypeLoc TL) { 2960 // FIXME: add other typespec types and change this to an assert. 2961 TL.initialize(Context, DS.getTypeSpecTypeLoc()); 2962 } 2963 }; 2964 2965 class DeclaratorLocFiller : public TypeLocVisitor<DeclaratorLocFiller> { 2966 ASTContext &Context; 2967 const DeclaratorChunk &Chunk; 2968 2969 public: 2970 DeclaratorLocFiller(ASTContext &Context, const DeclaratorChunk &Chunk) 2971 : Context(Context), Chunk(Chunk) {} 2972 2973 void VisitQualifiedTypeLoc(QualifiedTypeLoc TL) { 2974 llvm_unreachable("qualified type locs not expected here!"); 2975 } 2976 2977 void VisitAttributedTypeLoc(AttributedTypeLoc TL) { 2978 fillAttributedTypeLoc(TL, Chunk.getAttrs()); 2979 } 2980 void VisitBlockPointerTypeLoc(BlockPointerTypeLoc TL) { 2981 assert(Chunk.Kind == DeclaratorChunk::BlockPointer); 2982 TL.setCaretLoc(Chunk.Loc); 2983 } 2984 void VisitPointerTypeLoc(PointerTypeLoc TL) { 2985 assert(Chunk.Kind == DeclaratorChunk::Pointer); 2986 TL.setStarLoc(Chunk.Loc); 2987 } 2988 void VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL) { 2989 assert(Chunk.Kind == DeclaratorChunk::Pointer); 2990 TL.setStarLoc(Chunk.Loc); 2991 } 2992 void VisitMemberPointerTypeLoc(MemberPointerTypeLoc TL) { 2993 assert(Chunk.Kind == DeclaratorChunk::MemberPointer); 2994 const CXXScopeSpec& SS = Chunk.Mem.Scope(); 2995 NestedNameSpecifierLoc NNSLoc = SS.getWithLocInContext(Context); 2996 2997 const Type* ClsTy = TL.getClass(); 2998 QualType ClsQT = QualType(ClsTy, 0); 2999 TypeSourceInfo *ClsTInfo = Context.CreateTypeSourceInfo(ClsQT, 0); 3000 // Now copy source location info into the type loc component. 3001 TypeLoc ClsTL = ClsTInfo->getTypeLoc(); 3002 switch (NNSLoc.getNestedNameSpecifier()->getKind()) { 3003 case NestedNameSpecifier::Identifier: 3004 assert(isa<DependentNameType>(ClsTy) && "Unexpected TypeLoc"); 3005 { 3006 DependentNameTypeLoc DNTLoc = cast<DependentNameTypeLoc>(ClsTL); 3007 DNTLoc.setElaboratedKeywordLoc(SourceLocation()); 3008 DNTLoc.setQualifierLoc(NNSLoc.getPrefix()); 3009 DNTLoc.setNameLoc(NNSLoc.getLocalBeginLoc()); 3010 } 3011 break; 3012 3013 case NestedNameSpecifier::TypeSpec: 3014 case NestedNameSpecifier::TypeSpecWithTemplate: 3015 if (isa<ElaboratedType>(ClsTy)) { 3016 ElaboratedTypeLoc ETLoc = *cast<ElaboratedTypeLoc>(&ClsTL); 3017 ETLoc.setElaboratedKeywordLoc(SourceLocation()); 3018 ETLoc.setQualifierLoc(NNSLoc.getPrefix()); 3019 TypeLoc NamedTL = ETLoc.getNamedTypeLoc(); 3020 NamedTL.initializeFullCopy(NNSLoc.getTypeLoc()); 3021 } else { 3022 ClsTL.initializeFullCopy(NNSLoc.getTypeLoc()); 3023 } 3024 break; 3025 3026 case NestedNameSpecifier::Namespace: 3027 case NestedNameSpecifier::NamespaceAlias: 3028 case NestedNameSpecifier::Global: 3029 llvm_unreachable("Nested-name-specifier must name a type"); 3030 } 3031 3032 // Finally fill in MemberPointerLocInfo fields. 3033 TL.setStarLoc(Chunk.Loc); 3034 TL.setClassTInfo(ClsTInfo); 3035 } 3036 void VisitLValueReferenceTypeLoc(LValueReferenceTypeLoc TL) { 3037 assert(Chunk.Kind == DeclaratorChunk::Reference); 3038 // 'Amp' is misleading: this might have been originally 3039 /// spelled with AmpAmp. 3040 TL.setAmpLoc(Chunk.Loc); 3041 } 3042 void VisitRValueReferenceTypeLoc(RValueReferenceTypeLoc TL) { 3043 assert(Chunk.Kind == DeclaratorChunk::Reference); 3044 assert(!Chunk.Ref.LValueRef); 3045 TL.setAmpAmpLoc(Chunk.Loc); 3046 } 3047 void VisitArrayTypeLoc(ArrayTypeLoc TL) { 3048 assert(Chunk.Kind == DeclaratorChunk::Array); 3049 TL.setLBracketLoc(Chunk.Loc); 3050 TL.setRBracketLoc(Chunk.EndLoc); 3051 TL.setSizeExpr(static_cast<Expr*>(Chunk.Arr.NumElts)); 3052 } 3053 void VisitFunctionTypeLoc(FunctionTypeLoc TL) { 3054 assert(Chunk.Kind == DeclaratorChunk::Function); 3055 TL.setLocalRangeBegin(Chunk.Loc); 3056 TL.setLocalRangeEnd(Chunk.EndLoc); 3057 TL.setTrailingReturn(!!Chunk.Fun.TrailingReturnType); 3058 3059 const DeclaratorChunk::FunctionTypeInfo &FTI = Chunk.Fun; 3060 for (unsigned i = 0, e = TL.getNumArgs(), tpi = 0; i != e; ++i) { 3061 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 3062 TL.setArg(tpi++, Param); 3063 } 3064 // FIXME: exception specs 3065 } 3066 void VisitParenTypeLoc(ParenTypeLoc TL) { 3067 assert(Chunk.Kind == DeclaratorChunk::Paren); 3068 TL.setLParenLoc(Chunk.Loc); 3069 TL.setRParenLoc(Chunk.EndLoc); 3070 } 3071 3072 void VisitTypeLoc(TypeLoc TL) { 3073 llvm_unreachable("unsupported TypeLoc kind in declarator!"); 3074 } 3075 }; 3076} 3077 3078/// \brief Create and instantiate a TypeSourceInfo with type source information. 3079/// 3080/// \param T QualType referring to the type as written in source code. 3081/// 3082/// \param ReturnTypeInfo For declarators whose return type does not show 3083/// up in the normal place in the declaration specifiers (such as a C++ 3084/// conversion function), this pointer will refer to a type source information 3085/// for that return type. 3086TypeSourceInfo * 3087Sema::GetTypeSourceInfoForDeclarator(Declarator &D, QualType T, 3088 TypeSourceInfo *ReturnTypeInfo) { 3089 TypeSourceInfo *TInfo = Context.CreateTypeSourceInfo(T); 3090 UnqualTypeLoc CurrTL = TInfo->getTypeLoc().getUnqualifiedLoc(); 3091 3092 // Handle parameter packs whose type is a pack expansion. 3093 if (isa<PackExpansionType>(T)) { 3094 cast<PackExpansionTypeLoc>(CurrTL).setEllipsisLoc(D.getEllipsisLoc()); 3095 CurrTL = CurrTL.getNextTypeLoc().getUnqualifiedLoc(); 3096 } 3097 3098 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 3099 while (isa<AttributedTypeLoc>(CurrTL)) { 3100 AttributedTypeLoc TL = cast<AttributedTypeLoc>(CurrTL); 3101 fillAttributedTypeLoc(TL, D.getTypeObject(i).getAttrs()); 3102 CurrTL = TL.getNextTypeLoc().getUnqualifiedLoc(); 3103 } 3104 3105 DeclaratorLocFiller(Context, D.getTypeObject(i)).Visit(CurrTL); 3106 CurrTL = CurrTL.getNextTypeLoc().getUnqualifiedLoc(); 3107 } 3108 3109 // If we have different source information for the return type, use 3110 // that. This really only applies to C++ conversion functions. 3111 if (ReturnTypeInfo) { 3112 TypeLoc TL = ReturnTypeInfo->getTypeLoc(); 3113 assert(TL.getFullDataSize() == CurrTL.getFullDataSize()); 3114 memcpy(CurrTL.getOpaqueData(), TL.getOpaqueData(), TL.getFullDataSize()); 3115 } else { 3116 TypeSpecLocFiller(Context, D.getDeclSpec()).Visit(CurrTL); 3117 } 3118 3119 return TInfo; 3120} 3121 3122/// \brief Create a LocInfoType to hold the given QualType and TypeSourceInfo. 3123ParsedType Sema::CreateParsedType(QualType T, TypeSourceInfo *TInfo) { 3124 // FIXME: LocInfoTypes are "transient", only needed for passing to/from Parser 3125 // and Sema during declaration parsing. Try deallocating/caching them when 3126 // it's appropriate, instead of allocating them and keeping them around. 3127 LocInfoType *LocT = (LocInfoType*)BumpAlloc.Allocate(sizeof(LocInfoType), 3128 TypeAlignment); 3129 new (LocT) LocInfoType(T, TInfo); 3130 assert(LocT->getTypeClass() != T->getTypeClass() && 3131 "LocInfoType's TypeClass conflicts with an existing Type class"); 3132 return ParsedType::make(QualType(LocT, 0)); 3133} 3134 3135void LocInfoType::getAsStringInternal(std::string &Str, 3136 const PrintingPolicy &Policy) const { 3137 llvm_unreachable("LocInfoType leaked into the type system; an opaque TypeTy*" 3138 " was used directly instead of getting the QualType through" 3139 " GetTypeFromParser"); 3140} 3141 3142TypeResult Sema::ActOnTypeName(Scope *S, Declarator &D) { 3143 // C99 6.7.6: Type names have no identifier. This is already validated by 3144 // the parser. 3145 assert(D.getIdentifier() == 0 && "Type name should have no identifier!"); 3146 3147 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 3148 QualType T = TInfo->getType(); 3149 if (D.isInvalidType()) 3150 return true; 3151 3152 // Make sure there are no unused decl attributes on the declarator. 3153 // We don't want to do this for ObjC parameters because we're going 3154 // to apply them to the actual parameter declaration. 3155 if (D.getContext() != Declarator::ObjCParameterContext) 3156 checkUnusedDeclAttributes(D); 3157 3158 if (getLangOptions().CPlusPlus) { 3159 // Check that there are no default arguments (C++ only). 3160 CheckExtraCXXDefaultArguments(D); 3161 } 3162 3163 return CreateParsedType(T, TInfo); 3164} 3165 3166ParsedType Sema::ActOnObjCInstanceType(SourceLocation Loc) { 3167 QualType T = Context.getObjCInstanceType(); 3168 TypeSourceInfo *TInfo = Context.getTrivialTypeSourceInfo(T, Loc); 3169 return CreateParsedType(T, TInfo); 3170} 3171 3172 3173//===----------------------------------------------------------------------===// 3174// Type Attribute Processing 3175//===----------------------------------------------------------------------===// 3176 3177/// HandleAddressSpaceTypeAttribute - Process an address_space attribute on the 3178/// specified type. The attribute contains 1 argument, the id of the address 3179/// space for the type. 3180static void HandleAddressSpaceTypeAttribute(QualType &Type, 3181 const AttributeList &Attr, Sema &S){ 3182 3183 // If this type is already address space qualified, reject it. 3184 // ISO/IEC TR 18037 S5.3 (amending C99 6.7.3): "No type shall be qualified by 3185 // qualifiers for two or more different address spaces." 3186 if (Type.getAddressSpace()) { 3187 S.Diag(Attr.getLoc(), diag::err_attribute_address_multiple_qualifiers); 3188 Attr.setInvalid(); 3189 return; 3190 } 3191 3192 // ISO/IEC TR 18037 S5.3 (amending C99 6.7.3): "A function type shall not be 3193 // qualified by an address-space qualifier." 3194 if (Type->isFunctionType()) { 3195 S.Diag(Attr.getLoc(), diag::err_attribute_address_function_type); 3196 Attr.setInvalid(); 3197 return; 3198 } 3199 3200 // Check the attribute arguments. 3201 if (Attr.getNumArgs() != 1) { 3202 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 3203 Attr.setInvalid(); 3204 return; 3205 } 3206 Expr *ASArgExpr = static_cast<Expr *>(Attr.getArg(0)); 3207 llvm::APSInt addrSpace(32); 3208 if (ASArgExpr->isTypeDependent() || ASArgExpr->isValueDependent() || 3209 !ASArgExpr->isIntegerConstantExpr(addrSpace, S.Context)) { 3210 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_not_int) 3211 << ASArgExpr->getSourceRange(); 3212 Attr.setInvalid(); 3213 return; 3214 } 3215 3216 // Bounds checking. 3217 if (addrSpace.isSigned()) { 3218 if (addrSpace.isNegative()) { 3219 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_negative) 3220 << ASArgExpr->getSourceRange(); 3221 Attr.setInvalid(); 3222 return; 3223 } 3224 addrSpace.setIsSigned(false); 3225 } 3226 llvm::APSInt max(addrSpace.getBitWidth()); 3227 max = Qualifiers::MaxAddressSpace; 3228 if (addrSpace > max) { 3229 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_too_high) 3230 << Qualifiers::MaxAddressSpace << ASArgExpr->getSourceRange(); 3231 Attr.setInvalid(); 3232 return; 3233 } 3234 3235 unsigned ASIdx = static_cast<unsigned>(addrSpace.getZExtValue()); 3236 Type = S.Context.getAddrSpaceQualType(Type, ASIdx); 3237} 3238 3239/// handleObjCOwnershipTypeAttr - Process an objc_ownership 3240/// attribute on the specified type. 3241/// 3242/// Returns 'true' if the attribute was handled. 3243static bool handleObjCOwnershipTypeAttr(TypeProcessingState &state, 3244 AttributeList &attr, 3245 QualType &type) { 3246 bool NonObjCPointer = false; 3247 3248 if (!type->isDependentType()) { 3249 if (const PointerType *ptr = type->getAs<PointerType>()) { 3250 QualType pointee = ptr->getPointeeType(); 3251 if (pointee->isObjCRetainableType() || pointee->isPointerType()) 3252 return false; 3253 // It is important not to lose the source info that there was an attribute 3254 // applied to non-objc pointer. We will create an attributed type but 3255 // its type will be the same as the original type. 3256 NonObjCPointer = true; 3257 } else if (!type->isObjCRetainableType()) { 3258 return false; 3259 } 3260 } 3261 3262 Sema &S = state.getSema(); 3263 SourceLocation AttrLoc = attr.getLoc(); 3264 if (AttrLoc.isMacroID()) 3265 AttrLoc = S.getSourceManager().getImmediateExpansionRange(AttrLoc).first; 3266 3267 if (type.getQualifiers().getObjCLifetime()) { 3268 S.Diag(AttrLoc, diag::err_attr_objc_ownership_redundant) 3269 << type; 3270 return true; 3271 } 3272 3273 if (!attr.getParameterName()) { 3274 S.Diag(AttrLoc, diag::err_attribute_argument_n_not_string) 3275 << "objc_ownership" << 1; 3276 attr.setInvalid(); 3277 return true; 3278 } 3279 3280 Qualifiers::ObjCLifetime lifetime; 3281 if (attr.getParameterName()->isStr("none")) 3282 lifetime = Qualifiers::OCL_ExplicitNone; 3283 else if (attr.getParameterName()->isStr("strong")) 3284 lifetime = Qualifiers::OCL_Strong; 3285 else if (attr.getParameterName()->isStr("weak")) 3286 lifetime = Qualifiers::OCL_Weak; 3287 else if (attr.getParameterName()->isStr("autoreleasing")) 3288 lifetime = Qualifiers::OCL_Autoreleasing; 3289 else { 3290 S.Diag(AttrLoc, diag::warn_attribute_type_not_supported) 3291 << "objc_ownership" << attr.getParameterName(); 3292 attr.setInvalid(); 3293 return true; 3294 } 3295 3296 // Consume lifetime attributes without further comment outside of 3297 // ARC mode. 3298 if (!S.getLangOptions().ObjCAutoRefCount) 3299 return true; 3300 3301 if (NonObjCPointer) { 3302 StringRef name = attr.getName()->getName(); 3303 switch (lifetime) { 3304 case Qualifiers::OCL_None: 3305 case Qualifiers::OCL_ExplicitNone: 3306 break; 3307 case Qualifiers::OCL_Strong: name = "__strong"; break; 3308 case Qualifiers::OCL_Weak: name = "__weak"; break; 3309 case Qualifiers::OCL_Autoreleasing: name = "__autoreleasing"; break; 3310 } 3311 S.Diag(AttrLoc, diag::warn_objc_object_attribute_wrong_type) 3312 << name << type; 3313 } 3314 3315 Qualifiers qs; 3316 qs.setObjCLifetime(lifetime); 3317 QualType origType = type; 3318 if (!NonObjCPointer) 3319 type = S.Context.getQualifiedType(type, qs); 3320 3321 // If we have a valid source location for the attribute, use an 3322 // AttributedType instead. 3323 if (AttrLoc.isValid()) 3324 type = S.Context.getAttributedType(AttributedType::attr_objc_ownership, 3325 origType, type); 3326 3327 // Forbid __weak if the runtime doesn't support it. 3328 if (lifetime == Qualifiers::OCL_Weak && 3329 !S.getLangOptions().ObjCRuntimeHasWeak && !NonObjCPointer) { 3330 3331 // Actually, delay this until we know what we're parsing. 3332 if (S.DelayedDiagnostics.shouldDelayDiagnostics()) { 3333 S.DelayedDiagnostics.add( 3334 sema::DelayedDiagnostic::makeForbiddenType( 3335 S.getSourceManager().getExpansionLoc(AttrLoc), 3336 diag::err_arc_weak_no_runtime, type, /*ignored*/ 0)); 3337 } else { 3338 S.Diag(AttrLoc, diag::err_arc_weak_no_runtime); 3339 } 3340 3341 attr.setInvalid(); 3342 return true; 3343 } 3344 3345 // Forbid __weak for class objects marked as 3346 // objc_arc_weak_reference_unavailable 3347 if (lifetime == Qualifiers::OCL_Weak) { 3348 QualType T = type; 3349 while (const PointerType *ptr = T->getAs<PointerType>()) 3350 T = ptr->getPointeeType(); 3351 if (const ObjCObjectPointerType *ObjT = T->getAs<ObjCObjectPointerType>()) { 3352 ObjCInterfaceDecl *Class = ObjT->getInterfaceDecl(); 3353 if (Class->isArcWeakrefUnavailable()) { 3354 S.Diag(AttrLoc, diag::err_arc_unsupported_weak_class); 3355 S.Diag(ObjT->getInterfaceDecl()->getLocation(), 3356 diag::note_class_declared); 3357 } 3358 } 3359 } 3360 3361 return true; 3362} 3363 3364/// handleObjCGCTypeAttr - Process the __attribute__((objc_gc)) type 3365/// attribute on the specified type. Returns true to indicate that 3366/// the attribute was handled, false to indicate that the type does 3367/// not permit the attribute. 3368static bool handleObjCGCTypeAttr(TypeProcessingState &state, 3369 AttributeList &attr, 3370 QualType &type) { 3371 Sema &S = state.getSema(); 3372 3373 // Delay if this isn't some kind of pointer. 3374 if (!type->isPointerType() && 3375 !type->isObjCObjectPointerType() && 3376 !type->isBlockPointerType()) 3377 return false; 3378 3379 if (type.getObjCGCAttr() != Qualifiers::GCNone) { 3380 S.Diag(attr.getLoc(), diag::err_attribute_multiple_objc_gc); 3381 attr.setInvalid(); 3382 return true; 3383 } 3384 3385 // Check the attribute arguments. 3386 if (!attr.getParameterName()) { 3387 S.Diag(attr.getLoc(), diag::err_attribute_argument_n_not_string) 3388 << "objc_gc" << 1; 3389 attr.setInvalid(); 3390 return true; 3391 } 3392 Qualifiers::GC GCAttr; 3393 if (attr.getNumArgs() != 0) { 3394 S.Diag(attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 3395 attr.setInvalid(); 3396 return true; 3397 } 3398 if (attr.getParameterName()->isStr("weak")) 3399 GCAttr = Qualifiers::Weak; 3400 else if (attr.getParameterName()->isStr("strong")) 3401 GCAttr = Qualifiers::Strong; 3402 else { 3403 S.Diag(attr.getLoc(), diag::warn_attribute_type_not_supported) 3404 << "objc_gc" << attr.getParameterName(); 3405 attr.setInvalid(); 3406 return true; 3407 } 3408 3409 QualType origType = type; 3410 type = S.Context.getObjCGCQualType(origType, GCAttr); 3411 3412 // Make an attributed type to preserve the source information. 3413 if (attr.getLoc().isValid()) 3414 type = S.Context.getAttributedType(AttributedType::attr_objc_gc, 3415 origType, type); 3416 3417 return true; 3418} 3419 3420namespace { 3421 /// A helper class to unwrap a type down to a function for the 3422 /// purposes of applying attributes there. 3423 /// 3424 /// Use: 3425 /// FunctionTypeUnwrapper unwrapped(SemaRef, T); 3426 /// if (unwrapped.isFunctionType()) { 3427 /// const FunctionType *fn = unwrapped.get(); 3428 /// // change fn somehow 3429 /// T = unwrapped.wrap(fn); 3430 /// } 3431 struct FunctionTypeUnwrapper { 3432 enum WrapKind { 3433 Desugar, 3434 Parens, 3435 Pointer, 3436 BlockPointer, 3437 Reference, 3438 MemberPointer 3439 }; 3440 3441 QualType Original; 3442 const FunctionType *Fn; 3443 SmallVector<unsigned char /*WrapKind*/, 8> Stack; 3444 3445 FunctionTypeUnwrapper(Sema &S, QualType T) : Original(T) { 3446 while (true) { 3447 const Type *Ty = T.getTypePtr(); 3448 if (isa<FunctionType>(Ty)) { 3449 Fn = cast<FunctionType>(Ty); 3450 return; 3451 } else if (isa<ParenType>(Ty)) { 3452 T = cast<ParenType>(Ty)->getInnerType(); 3453 Stack.push_back(Parens); 3454 } else if (isa<PointerType>(Ty)) { 3455 T = cast<PointerType>(Ty)->getPointeeType(); 3456 Stack.push_back(Pointer); 3457 } else if (isa<BlockPointerType>(Ty)) { 3458 T = cast<BlockPointerType>(Ty)->getPointeeType(); 3459 Stack.push_back(BlockPointer); 3460 } else if (isa<MemberPointerType>(Ty)) { 3461 T = cast<MemberPointerType>(Ty)->getPointeeType(); 3462 Stack.push_back(MemberPointer); 3463 } else if (isa<ReferenceType>(Ty)) { 3464 T = cast<ReferenceType>(Ty)->getPointeeType(); 3465 Stack.push_back(Reference); 3466 } else { 3467 const Type *DTy = Ty->getUnqualifiedDesugaredType(); 3468 if (Ty == DTy) { 3469 Fn = 0; 3470 return; 3471 } 3472 3473 T = QualType(DTy, 0); 3474 Stack.push_back(Desugar); 3475 } 3476 } 3477 } 3478 3479 bool isFunctionType() const { return (Fn != 0); } 3480 const FunctionType *get() const { return Fn; } 3481 3482 QualType wrap(Sema &S, const FunctionType *New) { 3483 // If T wasn't modified from the unwrapped type, do nothing. 3484 if (New == get()) return Original; 3485 3486 Fn = New; 3487 return wrap(S.Context, Original, 0); 3488 } 3489 3490 private: 3491 QualType wrap(ASTContext &C, QualType Old, unsigned I) { 3492 if (I == Stack.size()) 3493 return C.getQualifiedType(Fn, Old.getQualifiers()); 3494 3495 // Build up the inner type, applying the qualifiers from the old 3496 // type to the new type. 3497 SplitQualType SplitOld = Old.split(); 3498 3499 // As a special case, tail-recurse if there are no qualifiers. 3500 if (SplitOld.second.empty()) 3501 return wrap(C, SplitOld.first, I); 3502 return C.getQualifiedType(wrap(C, SplitOld.first, I), SplitOld.second); 3503 } 3504 3505 QualType wrap(ASTContext &C, const Type *Old, unsigned I) { 3506 if (I == Stack.size()) return QualType(Fn, 0); 3507 3508 switch (static_cast<WrapKind>(Stack[I++])) { 3509 case Desugar: 3510 // This is the point at which we potentially lose source 3511 // information. 3512 return wrap(C, Old->getUnqualifiedDesugaredType(), I); 3513 3514 case Parens: { 3515 QualType New = wrap(C, cast<ParenType>(Old)->getInnerType(), I); 3516 return C.getParenType(New); 3517 } 3518 3519 case Pointer: { 3520 QualType New = wrap(C, cast<PointerType>(Old)->getPointeeType(), I); 3521 return C.getPointerType(New); 3522 } 3523 3524 case BlockPointer: { 3525 QualType New = wrap(C, cast<BlockPointerType>(Old)->getPointeeType(),I); 3526 return C.getBlockPointerType(New); 3527 } 3528 3529 case MemberPointer: { 3530 const MemberPointerType *OldMPT = cast<MemberPointerType>(Old); 3531 QualType New = wrap(C, OldMPT->getPointeeType(), I); 3532 return C.getMemberPointerType(New, OldMPT->getClass()); 3533 } 3534 3535 case Reference: { 3536 const ReferenceType *OldRef = cast<ReferenceType>(Old); 3537 QualType New = wrap(C, OldRef->getPointeeType(), I); 3538 if (isa<LValueReferenceType>(OldRef)) 3539 return C.getLValueReferenceType(New, OldRef->isSpelledAsLValue()); 3540 else 3541 return C.getRValueReferenceType(New); 3542 } 3543 } 3544 3545 llvm_unreachable("unknown wrapping kind"); 3546 } 3547 }; 3548} 3549 3550/// Process an individual function attribute. Returns true to 3551/// indicate that the attribute was handled, false if it wasn't. 3552static bool handleFunctionTypeAttr(TypeProcessingState &state, 3553 AttributeList &attr, 3554 QualType &type) { 3555 Sema &S = state.getSema(); 3556 3557 FunctionTypeUnwrapper unwrapped(S, type); 3558 3559 if (attr.getKind() == AttributeList::AT_noreturn) { 3560 if (S.CheckNoReturnAttr(attr)) 3561 return true; 3562 3563 // Delay if this is not a function type. 3564 if (!unwrapped.isFunctionType()) 3565 return false; 3566 3567 // Otherwise we can process right away. 3568 FunctionType::ExtInfo EI = unwrapped.get()->getExtInfo().withNoReturn(true); 3569 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 3570 return true; 3571 } 3572 3573 // ns_returns_retained is not always a type attribute, but if we got 3574 // here, we're treating it as one right now. 3575 if (attr.getKind() == AttributeList::AT_ns_returns_retained) { 3576 assert(S.getLangOptions().ObjCAutoRefCount && 3577 "ns_returns_retained treated as type attribute in non-ARC"); 3578 if (attr.getNumArgs()) return true; 3579 3580 // Delay if this is not a function type. 3581 if (!unwrapped.isFunctionType()) 3582 return false; 3583 3584 FunctionType::ExtInfo EI 3585 = unwrapped.get()->getExtInfo().withProducesResult(true); 3586 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 3587 return true; 3588 } 3589 3590 if (attr.getKind() == AttributeList::AT_regparm) { 3591 unsigned value; 3592 if (S.CheckRegparmAttr(attr, value)) 3593 return true; 3594 3595 // Delay if this is not a function type. 3596 if (!unwrapped.isFunctionType()) 3597 return false; 3598 3599 // Diagnose regparm with fastcall. 3600 const FunctionType *fn = unwrapped.get(); 3601 CallingConv CC = fn->getCallConv(); 3602 if (CC == CC_X86FastCall) { 3603 S.Diag(attr.getLoc(), diag::err_attributes_are_not_compatible) 3604 << FunctionType::getNameForCallConv(CC) 3605 << "regparm"; 3606 attr.setInvalid(); 3607 return true; 3608 } 3609 3610 FunctionType::ExtInfo EI = 3611 unwrapped.get()->getExtInfo().withRegParm(value); 3612 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 3613 return true; 3614 } 3615 3616 // Otherwise, a calling convention. 3617 CallingConv CC; 3618 if (S.CheckCallingConvAttr(attr, CC)) 3619 return true; 3620 3621 // Delay if the type didn't work out to a function. 3622 if (!unwrapped.isFunctionType()) return false; 3623 3624 const FunctionType *fn = unwrapped.get(); 3625 CallingConv CCOld = fn->getCallConv(); 3626 if (S.Context.getCanonicalCallConv(CC) == 3627 S.Context.getCanonicalCallConv(CCOld)) { 3628 FunctionType::ExtInfo EI= unwrapped.get()->getExtInfo().withCallingConv(CC); 3629 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 3630 return true; 3631 } 3632 3633 if (CCOld != (S.LangOpts.MRTD ? CC_X86StdCall : CC_Default)) { 3634 // Should we diagnose reapplications of the same convention? 3635 S.Diag(attr.getLoc(), diag::err_attributes_are_not_compatible) 3636 << FunctionType::getNameForCallConv(CC) 3637 << FunctionType::getNameForCallConv(CCOld); 3638 attr.setInvalid(); 3639 return true; 3640 } 3641 3642 // Diagnose the use of X86 fastcall on varargs or unprototyped functions. 3643 if (CC == CC_X86FastCall) { 3644 if (isa<FunctionNoProtoType>(fn)) { 3645 S.Diag(attr.getLoc(), diag::err_cconv_knr) 3646 << FunctionType::getNameForCallConv(CC); 3647 attr.setInvalid(); 3648 return true; 3649 } 3650 3651 const FunctionProtoType *FnP = cast<FunctionProtoType>(fn); 3652 if (FnP->isVariadic()) { 3653 S.Diag(attr.getLoc(), diag::err_cconv_varargs) 3654 << FunctionType::getNameForCallConv(CC); 3655 attr.setInvalid(); 3656 return true; 3657 } 3658 3659 // Also diagnose fastcall with regparm. 3660 if (fn->getHasRegParm()) { 3661 S.Diag(attr.getLoc(), diag::err_attributes_are_not_compatible) 3662 << "regparm" 3663 << FunctionType::getNameForCallConv(CC); 3664 attr.setInvalid(); 3665 return true; 3666 } 3667 } 3668 3669 FunctionType::ExtInfo EI = unwrapped.get()->getExtInfo().withCallingConv(CC); 3670 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 3671 return true; 3672} 3673 3674/// Handle OpenCL image access qualifiers: read_only, write_only, read_write 3675static void HandleOpenCLImageAccessAttribute(QualType& CurType, 3676 const AttributeList &Attr, 3677 Sema &S) { 3678 // Check the attribute arguments. 3679 if (Attr.getNumArgs() != 1) { 3680 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 3681 Attr.setInvalid(); 3682 return; 3683 } 3684 Expr *sizeExpr = static_cast<Expr *>(Attr.getArg(0)); 3685 llvm::APSInt arg(32); 3686 if (sizeExpr->isTypeDependent() || sizeExpr->isValueDependent() || 3687 !sizeExpr->isIntegerConstantExpr(arg, S.Context)) { 3688 S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int) 3689 << "opencl_image_access" << sizeExpr->getSourceRange(); 3690 Attr.setInvalid(); 3691 return; 3692 } 3693 unsigned iarg = static_cast<unsigned>(arg.getZExtValue()); 3694 switch (iarg) { 3695 case CLIA_read_only: 3696 case CLIA_write_only: 3697 case CLIA_read_write: 3698 // Implemented in a separate patch 3699 break; 3700 default: 3701 // Implemented in a separate patch 3702 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_size) 3703 << sizeExpr->getSourceRange(); 3704 Attr.setInvalid(); 3705 break; 3706 } 3707} 3708 3709/// HandleVectorSizeAttribute - this attribute is only applicable to integral 3710/// and float scalars, although arrays, pointers, and function return values are 3711/// allowed in conjunction with this construct. Aggregates with this attribute 3712/// are invalid, even if they are of the same size as a corresponding scalar. 3713/// The raw attribute should contain precisely 1 argument, the vector size for 3714/// the variable, measured in bytes. If curType and rawAttr are well formed, 3715/// this routine will return a new vector type. 3716static void HandleVectorSizeAttr(QualType& CurType, const AttributeList &Attr, 3717 Sema &S) { 3718 // Check the attribute arguments. 3719 if (Attr.getNumArgs() != 1) { 3720 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 3721 Attr.setInvalid(); 3722 return; 3723 } 3724 Expr *sizeExpr = static_cast<Expr *>(Attr.getArg(0)); 3725 llvm::APSInt vecSize(32); 3726 if (sizeExpr->isTypeDependent() || sizeExpr->isValueDependent() || 3727 !sizeExpr->isIntegerConstantExpr(vecSize, S.Context)) { 3728 S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int) 3729 << "vector_size" << sizeExpr->getSourceRange(); 3730 Attr.setInvalid(); 3731 return; 3732 } 3733 // the base type must be integer or float, and can't already be a vector. 3734 if (!CurType->isIntegerType() && !CurType->isRealFloatingType()) { 3735 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_vector_type) << CurType; 3736 Attr.setInvalid(); 3737 return; 3738 } 3739 unsigned typeSize = static_cast<unsigned>(S.Context.getTypeSize(CurType)); 3740 // vecSize is specified in bytes - convert to bits. 3741 unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue() * 8); 3742 3743 // the vector size needs to be an integral multiple of the type size. 3744 if (vectorSize % typeSize) { 3745 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_size) 3746 << sizeExpr->getSourceRange(); 3747 Attr.setInvalid(); 3748 return; 3749 } 3750 if (vectorSize == 0) { 3751 S.Diag(Attr.getLoc(), diag::err_attribute_zero_size) 3752 << sizeExpr->getSourceRange(); 3753 Attr.setInvalid(); 3754 return; 3755 } 3756 3757 // Success! Instantiate the vector type, the number of elements is > 0, and 3758 // not required to be a power of 2, unlike GCC. 3759 CurType = S.Context.getVectorType(CurType, vectorSize/typeSize, 3760 VectorType::GenericVector); 3761} 3762 3763/// \brief Process the OpenCL-like ext_vector_type attribute when it occurs on 3764/// a type. 3765static void HandleExtVectorTypeAttr(QualType &CurType, 3766 const AttributeList &Attr, 3767 Sema &S) { 3768 Expr *sizeExpr; 3769 3770 // Special case where the argument is a template id. 3771 if (Attr.getParameterName()) { 3772 CXXScopeSpec SS; 3773 SourceLocation TemplateKWLoc; 3774 UnqualifiedId id; 3775 id.setIdentifier(Attr.getParameterName(), Attr.getLoc()); 3776 3777 ExprResult Size = S.ActOnIdExpression(S.getCurScope(), SS, TemplateKWLoc, 3778 id, false, false); 3779 if (Size.isInvalid()) 3780 return; 3781 3782 sizeExpr = Size.get(); 3783 } else { 3784 // check the attribute arguments. 3785 if (Attr.getNumArgs() != 1) { 3786 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 3787 return; 3788 } 3789 sizeExpr = Attr.getArg(0); 3790 } 3791 3792 // Create the vector type. 3793 QualType T = S.BuildExtVectorType(CurType, sizeExpr, Attr.getLoc()); 3794 if (!T.isNull()) 3795 CurType = T; 3796} 3797 3798/// HandleNeonVectorTypeAttr - The "neon_vector_type" and 3799/// "neon_polyvector_type" attributes are used to create vector types that 3800/// are mangled according to ARM's ABI. Otherwise, these types are identical 3801/// to those created with the "vector_size" attribute. Unlike "vector_size" 3802/// the argument to these Neon attributes is the number of vector elements, 3803/// not the vector size in bytes. The vector width and element type must 3804/// match one of the standard Neon vector types. 3805static void HandleNeonVectorTypeAttr(QualType& CurType, 3806 const AttributeList &Attr, Sema &S, 3807 VectorType::VectorKind VecKind, 3808 const char *AttrName) { 3809 // Check the attribute arguments. 3810 if (Attr.getNumArgs() != 1) { 3811 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 3812 Attr.setInvalid(); 3813 return; 3814 } 3815 // The number of elements must be an ICE. 3816 Expr *numEltsExpr = static_cast<Expr *>(Attr.getArg(0)); 3817 llvm::APSInt numEltsInt(32); 3818 if (numEltsExpr->isTypeDependent() || numEltsExpr->isValueDependent() || 3819 !numEltsExpr->isIntegerConstantExpr(numEltsInt, S.Context)) { 3820 S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int) 3821 << AttrName << numEltsExpr->getSourceRange(); 3822 Attr.setInvalid(); 3823 return; 3824 } 3825 // Only certain element types are supported for Neon vectors. 3826 const BuiltinType* BTy = CurType->getAs<BuiltinType>(); 3827 if (!BTy || 3828 (VecKind == VectorType::NeonPolyVector && 3829 BTy->getKind() != BuiltinType::SChar && 3830 BTy->getKind() != BuiltinType::Short) || 3831 (BTy->getKind() != BuiltinType::SChar && 3832 BTy->getKind() != BuiltinType::UChar && 3833 BTy->getKind() != BuiltinType::Short && 3834 BTy->getKind() != BuiltinType::UShort && 3835 BTy->getKind() != BuiltinType::Int && 3836 BTy->getKind() != BuiltinType::UInt && 3837 BTy->getKind() != BuiltinType::LongLong && 3838 BTy->getKind() != BuiltinType::ULongLong && 3839 BTy->getKind() != BuiltinType::Float)) { 3840 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_vector_type) <<CurType; 3841 Attr.setInvalid(); 3842 return; 3843 } 3844 // The total size of the vector must be 64 or 128 bits. 3845 unsigned typeSize = static_cast<unsigned>(S.Context.getTypeSize(CurType)); 3846 unsigned numElts = static_cast<unsigned>(numEltsInt.getZExtValue()); 3847 unsigned vecSize = typeSize * numElts; 3848 if (vecSize != 64 && vecSize != 128) { 3849 S.Diag(Attr.getLoc(), diag::err_attribute_bad_neon_vector_size) << CurType; 3850 Attr.setInvalid(); 3851 return; 3852 } 3853 3854 CurType = S.Context.getVectorType(CurType, numElts, VecKind); 3855} 3856 3857static void processTypeAttrs(TypeProcessingState &state, QualType &type, 3858 bool isDeclSpec, AttributeList *attrs) { 3859 // Scan through and apply attributes to this type where it makes sense. Some 3860 // attributes (such as __address_space__, __vector_size__, etc) apply to the 3861 // type, but others can be present in the type specifiers even though they 3862 // apply to the decl. Here we apply type attributes and ignore the rest. 3863 3864 AttributeList *next; 3865 do { 3866 AttributeList &attr = *attrs; 3867 next = attr.getNext(); 3868 3869 // Skip attributes that were marked to be invalid. 3870 if (attr.isInvalid()) 3871 continue; 3872 3873 // If this is an attribute we can handle, do so now, 3874 // otherwise, add it to the FnAttrs list for rechaining. 3875 switch (attr.getKind()) { 3876 default: break; 3877 3878 case AttributeList::AT_may_alias: 3879 // FIXME: This attribute needs to actually be handled, but if we ignore 3880 // it it breaks large amounts of Linux software. 3881 attr.setUsedAsTypeAttr(); 3882 break; 3883 case AttributeList::AT_address_space: 3884 HandleAddressSpaceTypeAttribute(type, attr, state.getSema()); 3885 attr.setUsedAsTypeAttr(); 3886 break; 3887 OBJC_POINTER_TYPE_ATTRS_CASELIST: 3888 if (!handleObjCPointerTypeAttr(state, attr, type)) 3889 distributeObjCPointerTypeAttr(state, attr, type); 3890 attr.setUsedAsTypeAttr(); 3891 break; 3892 case AttributeList::AT_vector_size: 3893 HandleVectorSizeAttr(type, attr, state.getSema()); 3894 attr.setUsedAsTypeAttr(); 3895 break; 3896 case AttributeList::AT_ext_vector_type: 3897 if (state.getDeclarator().getDeclSpec().getStorageClassSpec() 3898 != DeclSpec::SCS_typedef) 3899 HandleExtVectorTypeAttr(type, attr, state.getSema()); 3900 attr.setUsedAsTypeAttr(); 3901 break; 3902 case AttributeList::AT_neon_vector_type: 3903 HandleNeonVectorTypeAttr(type, attr, state.getSema(), 3904 VectorType::NeonVector, "neon_vector_type"); 3905 attr.setUsedAsTypeAttr(); 3906 break; 3907 case AttributeList::AT_neon_polyvector_type: 3908 HandleNeonVectorTypeAttr(type, attr, state.getSema(), 3909 VectorType::NeonPolyVector, 3910 "neon_polyvector_type"); 3911 attr.setUsedAsTypeAttr(); 3912 break; 3913 case AttributeList::AT_opencl_image_access: 3914 HandleOpenCLImageAccessAttribute(type, attr, state.getSema()); 3915 attr.setUsedAsTypeAttr(); 3916 break; 3917 3918 case AttributeList::AT_ns_returns_retained: 3919 if (!state.getSema().getLangOptions().ObjCAutoRefCount) 3920 break; 3921 // fallthrough into the function attrs 3922 3923 FUNCTION_TYPE_ATTRS_CASELIST: 3924 attr.setUsedAsTypeAttr(); 3925 3926 // Never process function type attributes as part of the 3927 // declaration-specifiers. 3928 if (isDeclSpec) 3929 distributeFunctionTypeAttrFromDeclSpec(state, attr, type); 3930 3931 // Otherwise, handle the possible delays. 3932 else if (!handleFunctionTypeAttr(state, attr, type)) 3933 distributeFunctionTypeAttr(state, attr, type); 3934 break; 3935 } 3936 } while ((attrs = next)); 3937} 3938 3939/// \brief Ensure that the type of the given expression is complete. 3940/// 3941/// This routine checks whether the expression \p E has a complete type. If the 3942/// expression refers to an instantiable construct, that instantiation is 3943/// performed as needed to complete its type. Furthermore 3944/// Sema::RequireCompleteType is called for the expression's type (or in the 3945/// case of a reference type, the referred-to type). 3946/// 3947/// \param E The expression whose type is required to be complete. 3948/// \param PD The partial diagnostic that will be printed out if the type cannot 3949/// be completed. 3950/// 3951/// \returns \c true if the type of \p E is incomplete and diagnosed, \c false 3952/// otherwise. 3953bool Sema::RequireCompleteExprType(Expr *E, const PartialDiagnostic &PD, 3954 std::pair<SourceLocation, 3955 PartialDiagnostic> Note) { 3956 QualType T = E->getType(); 3957 3958 // Fast path the case where the type is already complete. 3959 if (!T->isIncompleteType()) 3960 return false; 3961 3962 // Incomplete array types may be completed by the initializer attached to 3963 // their definitions. For static data members of class templates we need to 3964 // instantiate the definition to get this initializer and complete the type. 3965 if (T->isIncompleteArrayType()) { 3966 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E->IgnoreParens())) { 3967 if (VarDecl *Var = dyn_cast<VarDecl>(DRE->getDecl())) { 3968 if (Var->isStaticDataMember() && 3969 Var->getInstantiatedFromStaticDataMember()) { 3970 3971 MemberSpecializationInfo *MSInfo = Var->getMemberSpecializationInfo(); 3972 assert(MSInfo && "Missing member specialization information?"); 3973 if (MSInfo->getTemplateSpecializationKind() 3974 != TSK_ExplicitSpecialization) { 3975 // If we don't already have a point of instantiation, this is it. 3976 if (MSInfo->getPointOfInstantiation().isInvalid()) { 3977 MSInfo->setPointOfInstantiation(E->getLocStart()); 3978 3979 // This is a modification of an existing AST node. Notify 3980 // listeners. 3981 if (ASTMutationListener *L = getASTMutationListener()) 3982 L->StaticDataMemberInstantiated(Var); 3983 } 3984 3985 InstantiateStaticDataMemberDefinition(E->getExprLoc(), Var); 3986 3987 // Update the type to the newly instantiated definition's type both 3988 // here and within the expression. 3989 if (VarDecl *Def = Var->getDefinition()) { 3990 DRE->setDecl(Def); 3991 T = Def->getType(); 3992 DRE->setType(T); 3993 E->setType(T); 3994 } 3995 } 3996 3997 // We still go on to try to complete the type independently, as it 3998 // may also require instantiations or diagnostics if it remains 3999 // incomplete. 4000 } 4001 } 4002 } 4003 } 4004 4005 // FIXME: Are there other cases which require instantiating something other 4006 // than the type to complete the type of an expression? 4007 4008 // Look through reference types and complete the referred type. 4009 if (const ReferenceType *Ref = T->getAs<ReferenceType>()) 4010 T = Ref->getPointeeType(); 4011 4012 return RequireCompleteType(E->getExprLoc(), T, PD, Note); 4013} 4014 4015/// @brief Ensure that the type T is a complete type. 4016/// 4017/// This routine checks whether the type @p T is complete in any 4018/// context where a complete type is required. If @p T is a complete 4019/// type, returns false. If @p T is a class template specialization, 4020/// this routine then attempts to perform class template 4021/// instantiation. If instantiation fails, or if @p T is incomplete 4022/// and cannot be completed, issues the diagnostic @p diag (giving it 4023/// the type @p T) and returns true. 4024/// 4025/// @param Loc The location in the source that the incomplete type 4026/// diagnostic should refer to. 4027/// 4028/// @param T The type that this routine is examining for completeness. 4029/// 4030/// @param PD The partial diagnostic that will be printed out if T is not a 4031/// complete type. 4032/// 4033/// @returns @c true if @p T is incomplete and a diagnostic was emitted, 4034/// @c false otherwise. 4035bool Sema::RequireCompleteType(SourceLocation Loc, QualType T, 4036 const PartialDiagnostic &PD, 4037 std::pair<SourceLocation, 4038 PartialDiagnostic> Note) { 4039 unsigned diag = PD.getDiagID(); 4040 4041 // FIXME: Add this assertion to make sure we always get instantiation points. 4042 // assert(!Loc.isInvalid() && "Invalid location in RequireCompleteType"); 4043 // FIXME: Add this assertion to help us flush out problems with 4044 // checking for dependent types and type-dependent expressions. 4045 // 4046 // assert(!T->isDependentType() && 4047 // "Can't ask whether a dependent type is complete"); 4048 4049 // If we have a complete type, we're done. 4050 NamedDecl *Def = 0; 4051 if (!T->isIncompleteType(&Def)) { 4052 // If we know about the definition but it is not visible, complain. 4053 if (diag != 0 && Def && !LookupResult::isVisible(Def)) { 4054 // Suppress this error outside of a SFINAE context if we've already 4055 // emitted the error once for this type. There's no usefulness in 4056 // repeating the diagnostic. 4057 // FIXME: Add a Fix-It that imports the corresponding module or includes 4058 // the header. 4059 if (isSFINAEContext() || HiddenDefinitions.insert(Def)) { 4060 Diag(Loc, diag::err_module_private_definition) << T; 4061 Diag(Def->getLocation(), diag::note_previous_definition); 4062 } 4063 } 4064 4065 return false; 4066 } 4067 4068 const TagType *Tag = T->getAs<TagType>(); 4069 const ObjCInterfaceType *IFace = 0; 4070 4071 if (Tag) { 4072 // Avoid diagnosing invalid decls as incomplete. 4073 if (Tag->getDecl()->isInvalidDecl()) 4074 return true; 4075 4076 // Give the external AST source a chance to complete the type. 4077 if (Tag->getDecl()->hasExternalLexicalStorage()) { 4078 Context.getExternalSource()->CompleteType(Tag->getDecl()); 4079 if (!Tag->isIncompleteType()) 4080 return false; 4081 } 4082 } 4083 else if ((IFace = T->getAs<ObjCInterfaceType>())) { 4084 // Avoid diagnosing invalid decls as incomplete. 4085 if (IFace->getDecl()->isInvalidDecl()) 4086 return true; 4087 4088 // Give the external AST source a chance to complete the type. 4089 if (IFace->getDecl()->hasExternalLexicalStorage()) { 4090 Context.getExternalSource()->CompleteType(IFace->getDecl()); 4091 if (!IFace->isIncompleteType()) 4092 return false; 4093 } 4094 } 4095 4096 // If we have a class template specialization or a class member of a 4097 // class template specialization, or an array with known size of such, 4098 // try to instantiate it. 4099 QualType MaybeTemplate = T; 4100 if (const ConstantArrayType *Array = Context.getAsConstantArrayType(T)) 4101 MaybeTemplate = Array->getElementType(); 4102 if (const RecordType *Record = MaybeTemplate->getAs<RecordType>()) { 4103 if (ClassTemplateSpecializationDecl *ClassTemplateSpec 4104 = dyn_cast<ClassTemplateSpecializationDecl>(Record->getDecl())) { 4105 if (ClassTemplateSpec->getSpecializationKind() == TSK_Undeclared) 4106 return InstantiateClassTemplateSpecialization(Loc, ClassTemplateSpec, 4107 TSK_ImplicitInstantiation, 4108 /*Complain=*/diag != 0); 4109 } else if (CXXRecordDecl *Rec 4110 = dyn_cast<CXXRecordDecl>(Record->getDecl())) { 4111 if (CXXRecordDecl *Pattern = Rec->getInstantiatedFromMemberClass()) { 4112 MemberSpecializationInfo *MSInfo = Rec->getMemberSpecializationInfo(); 4113 assert(MSInfo && "Missing member specialization information?"); 4114 // This record was instantiated from a class within a template. 4115 if (MSInfo->getTemplateSpecializationKind() 4116 != TSK_ExplicitSpecialization) 4117 return InstantiateClass(Loc, Rec, Pattern, 4118 getTemplateInstantiationArgs(Rec), 4119 TSK_ImplicitInstantiation, 4120 /*Complain=*/diag != 0); 4121 } 4122 } 4123 } 4124 4125 if (diag == 0) 4126 return true; 4127 4128 // We have an incomplete type. Produce a diagnostic. 4129 Diag(Loc, PD) << T; 4130 4131 // If we have a note, produce it. 4132 if (!Note.first.isInvalid()) 4133 Diag(Note.first, Note.second); 4134 4135 // If the type was a forward declaration of a class/struct/union 4136 // type, produce a note. 4137 if (Tag && !Tag->getDecl()->isInvalidDecl()) 4138 Diag(Tag->getDecl()->getLocation(), 4139 Tag->isBeingDefined() ? diag::note_type_being_defined 4140 : diag::note_forward_declaration) 4141 << QualType(Tag, 0); 4142 4143 // If the Objective-C class was a forward declaration, produce a note. 4144 if (IFace && !IFace->getDecl()->isInvalidDecl()) 4145 Diag(IFace->getDecl()->getLocation(), diag::note_forward_class); 4146 4147 return true; 4148} 4149 4150bool Sema::RequireCompleteType(SourceLocation Loc, QualType T, 4151 const PartialDiagnostic &PD) { 4152 return RequireCompleteType(Loc, T, PD, 4153 std::make_pair(SourceLocation(), PDiag(0))); 4154} 4155 4156bool Sema::RequireCompleteType(SourceLocation Loc, QualType T, 4157 unsigned DiagID) { 4158 return RequireCompleteType(Loc, T, PDiag(DiagID), 4159 std::make_pair(SourceLocation(), PDiag(0))); 4160} 4161 4162/// @brief Ensure that the type T is a literal type. 4163/// 4164/// This routine checks whether the type @p T is a literal type. If @p T is an 4165/// incomplete type, an attempt is made to complete it. If @p T is a literal 4166/// type, or @p AllowIncompleteType is true and @p T is an incomplete type, 4167/// returns false. Otherwise, this routine issues the diagnostic @p PD (giving 4168/// it the type @p T), along with notes explaining why the type is not a 4169/// literal type, and returns true. 4170/// 4171/// @param Loc The location in the source that the non-literal type 4172/// diagnostic should refer to. 4173/// 4174/// @param T The type that this routine is examining for literalness. 4175/// 4176/// @param PD The partial diagnostic that will be printed out if T is not a 4177/// literal type. 4178/// 4179/// @param AllowIncompleteType If true, an incomplete type will be considered 4180/// acceptable. 4181/// 4182/// @returns @c true if @p T is not a literal type and a diagnostic was emitted, 4183/// @c false otherwise. 4184bool Sema::RequireLiteralType(SourceLocation Loc, QualType T, 4185 const PartialDiagnostic &PD, 4186 bool AllowIncompleteType) { 4187 assert(!T->isDependentType() && "type should not be dependent"); 4188 4189 bool Incomplete = RequireCompleteType(Loc, T, 0); 4190 if (T->isLiteralType() || 4191 (AllowIncompleteType && Incomplete && !T->isVoidType())) 4192 return false; 4193 4194 if (PD.getDiagID() == 0) 4195 return true; 4196 4197 Diag(Loc, PD) << T; 4198 4199 if (T->isVariableArrayType()) 4200 return true; 4201 4202 const RecordType *RT = T->getBaseElementTypeUnsafe()->getAs<RecordType>(); 4203 if (!RT) 4204 return true; 4205 4206 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 4207 4208 // If the class has virtual base classes, then it's not an aggregate, and 4209 // cannot have any constexpr constructors, so is non-literal. This is better 4210 // to diagnose than the resulting absence of constexpr constructors. 4211 if (RD->getNumVBases()) { 4212 Diag(RD->getLocation(), diag::note_non_literal_virtual_base) 4213 << RD->isStruct() << RD->getNumVBases(); 4214 for (CXXRecordDecl::base_class_const_iterator I = RD->vbases_begin(), 4215 E = RD->vbases_end(); I != E; ++I) 4216 Diag(I->getSourceRange().getBegin(), 4217 diag::note_constexpr_virtual_base_here) << I->getSourceRange(); 4218 } else if (!RD->isAggregate() && !RD->hasConstexprNonCopyMoveConstructor()) { 4219 Diag(RD->getLocation(), diag::note_non_literal_no_constexpr_ctors) << RD; 4220 4221 switch (RD->getTemplateSpecializationKind()) { 4222 case TSK_Undeclared: 4223 case TSK_ExplicitSpecialization: 4224 break; 4225 4226 case TSK_ImplicitInstantiation: 4227 case TSK_ExplicitInstantiationDeclaration: 4228 case TSK_ExplicitInstantiationDefinition: 4229 // If the base template had constexpr constructors which were 4230 // instantiated as non-constexpr constructors, explain why. 4231 for (CXXRecordDecl::ctor_iterator I = RD->ctor_begin(), 4232 E = RD->ctor_end(); I != E; ++I) { 4233 if ((*I)->isCopyConstructor() || (*I)->isMoveConstructor()) 4234 continue; 4235 4236 FunctionDecl *Base = (*I)->getInstantiatedFromMemberFunction(); 4237 if (Base && Base->isConstexpr()) 4238 CheckConstexprFunctionDecl(*I, CCK_NoteNonConstexprInstantiation); 4239 } 4240 } 4241 } else if (RD->hasNonLiteralTypeFieldsOrBases()) { 4242 for (CXXRecordDecl::base_class_const_iterator I = RD->bases_begin(), 4243 E = RD->bases_end(); I != E; ++I) { 4244 if (!I->getType()->isLiteralType()) { 4245 Diag(I->getSourceRange().getBegin(), 4246 diag::note_non_literal_base_class) 4247 << RD << I->getType() << I->getSourceRange(); 4248 return true; 4249 } 4250 } 4251 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 4252 E = RD->field_end(); I != E; ++I) { 4253 if (!(*I)->getType()->isLiteralType()) { 4254 Diag((*I)->getLocation(), diag::note_non_literal_field) 4255 << RD << (*I) << (*I)->getType(); 4256 return true; 4257 } else if ((*I)->isMutable()) { 4258 Diag((*I)->getLocation(), diag::note_non_literal_mutable_field) << RD; 4259 return true; 4260 } 4261 } 4262 } else if (!RD->hasTrivialDestructor()) { 4263 // All fields and bases are of literal types, so have trivial destructors. 4264 // If this class's destructor is non-trivial it must be user-declared. 4265 CXXDestructorDecl *Dtor = RD->getDestructor(); 4266 assert(Dtor && "class has literal fields and bases but no dtor?"); 4267 if (!Dtor) 4268 return true; 4269 4270 Diag(Dtor->getLocation(), Dtor->isUserProvided() ? 4271 diag::note_non_literal_user_provided_dtor : 4272 diag::note_non_literal_nontrivial_dtor) << RD; 4273 } 4274 4275 return true; 4276} 4277 4278/// \brief Retrieve a version of the type 'T' that is elaborated by Keyword 4279/// and qualified by the nested-name-specifier contained in SS. 4280QualType Sema::getElaboratedType(ElaboratedTypeKeyword Keyword, 4281 const CXXScopeSpec &SS, QualType T) { 4282 if (T.isNull()) 4283 return T; 4284 NestedNameSpecifier *NNS; 4285 if (SS.isValid()) 4286 NNS = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 4287 else { 4288 if (Keyword == ETK_None) 4289 return T; 4290 NNS = 0; 4291 } 4292 return Context.getElaboratedType(Keyword, NNS, T); 4293} 4294 4295QualType Sema::BuildTypeofExprType(Expr *E, SourceLocation Loc) { 4296 ExprResult ER = CheckPlaceholderExpr(E); 4297 if (ER.isInvalid()) return QualType(); 4298 E = ER.take(); 4299 4300 if (!E->isTypeDependent()) { 4301 QualType T = E->getType(); 4302 if (const TagType *TT = T->getAs<TagType>()) 4303 DiagnoseUseOfDecl(TT->getDecl(), E->getExprLoc()); 4304 } 4305 return Context.getTypeOfExprType(E); 4306} 4307 4308QualType Sema::BuildDecltypeType(Expr *E, SourceLocation Loc) { 4309 ExprResult ER = CheckPlaceholderExpr(E); 4310 if (ER.isInvalid()) return QualType(); 4311 E = ER.take(); 4312 4313 return Context.getDecltypeType(E); 4314} 4315 4316QualType Sema::BuildUnaryTransformType(QualType BaseType, 4317 UnaryTransformType::UTTKind UKind, 4318 SourceLocation Loc) { 4319 switch (UKind) { 4320 case UnaryTransformType::EnumUnderlyingType: 4321 if (!BaseType->isDependentType() && !BaseType->isEnumeralType()) { 4322 Diag(Loc, diag::err_only_enums_have_underlying_types); 4323 return QualType(); 4324 } else { 4325 QualType Underlying = BaseType; 4326 if (!BaseType->isDependentType()) { 4327 EnumDecl *ED = BaseType->getAs<EnumType>()->getDecl(); 4328 assert(ED && "EnumType has no EnumDecl"); 4329 DiagnoseUseOfDecl(ED, Loc); 4330 Underlying = ED->getIntegerType(); 4331 } 4332 assert(!Underlying.isNull()); 4333 return Context.getUnaryTransformType(BaseType, Underlying, 4334 UnaryTransformType::EnumUnderlyingType); 4335 } 4336 } 4337 llvm_unreachable("unknown unary transform type"); 4338} 4339 4340QualType Sema::BuildAtomicType(QualType T, SourceLocation Loc) { 4341 if (!T->isDependentType()) { 4342 int DisallowedKind = -1; 4343 if (T->isIncompleteType()) 4344 // FIXME: It isn't entirely clear whether incomplete atomic types 4345 // are allowed or not; for simplicity, ban them for the moment. 4346 DisallowedKind = 0; 4347 else if (T->isArrayType()) 4348 DisallowedKind = 1; 4349 else if (T->isFunctionType()) 4350 DisallowedKind = 2; 4351 else if (T->isReferenceType()) 4352 DisallowedKind = 3; 4353 else if (T->isAtomicType()) 4354 DisallowedKind = 4; 4355 else if (T.hasQualifiers()) 4356 DisallowedKind = 5; 4357 else if (!T.isTriviallyCopyableType(Context)) 4358 // Some other non-trivially-copyable type (probably a C++ class) 4359 DisallowedKind = 6; 4360 4361 if (DisallowedKind != -1) { 4362 Diag(Loc, diag::err_atomic_specifier_bad_type) << DisallowedKind << T; 4363 return QualType(); 4364 } 4365 4366 // FIXME: Do we need any handling for ARC here? 4367 } 4368 4369 // Build the pointer type. 4370 return Context.getAtomicType(T); 4371} 4372