SemaType.cpp revision 05d4876a64865e34366b58fc8a6848c3cde895d9
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 "llvm/ADT/SmallPtrSet.h" 31#include "llvm/Support/ErrorHandling.h" 32using namespace clang; 33 34/// \brief Perform adjustment on the parameter type of a function. 35/// 36/// This routine adjusts the given parameter type @p T to the actual 37/// parameter type used by semantic analysis (C99 6.7.5.3p[7,8], 38/// C++ [dcl.fct]p3). The adjusted parameter type is returned. 39QualType Sema::adjustParameterType(QualType T) { 40 // C99 6.7.5.3p7: 41 // A declaration of a parameter as "array of type" shall be 42 // adjusted to "qualified pointer to type", where the type 43 // qualifiers (if any) are those specified within the [ and ] of 44 // the array type derivation. 45 if (T->isArrayType()) 46 return Context.getArrayDecayedType(T); 47 48 // C99 6.7.5.3p8: 49 // A declaration of a parameter as "function returning type" 50 // shall be adjusted to "pointer to function returning type", as 51 // in 6.3.2.1. 52 if (T->isFunctionType()) 53 return Context.getPointerType(T); 54 55 return T; 56} 57 58 59 60/// isOmittedBlockReturnType - Return true if this declarator is missing a 61/// return type because this is a omitted return type on a block literal. 62static bool isOmittedBlockReturnType(const Declarator &D) { 63 if (D.getContext() != Declarator::BlockLiteralContext || 64 D.getDeclSpec().hasTypeSpecifier()) 65 return false; 66 67 if (D.getNumTypeObjects() == 0) 68 return true; // ^{ ... } 69 70 if (D.getNumTypeObjects() == 1 && 71 D.getTypeObject(0).Kind == DeclaratorChunk::Function) 72 return true; // ^(int X, float Y) { ... } 73 74 return false; 75} 76 77/// diagnoseBadTypeAttribute - Diagnoses a type attribute which 78/// doesn't apply to the given type. 79static void diagnoseBadTypeAttribute(Sema &S, const AttributeList &attr, 80 QualType type) { 81 bool useInstantiationLoc = false; 82 83 unsigned diagID = 0; 84 switch (attr.getKind()) { 85 case AttributeList::AT_objc_gc: 86 diagID = diag::warn_pointer_attribute_wrong_type; 87 useInstantiationLoc = true; 88 break; 89 90 case AttributeList::AT_objc_ownership: 91 diagID = diag::warn_objc_object_attribute_wrong_type; 92 useInstantiationLoc = true; 93 break; 94 95 default: 96 // Assume everything else was a function attribute. 97 diagID = diag::warn_function_attribute_wrong_type; 98 break; 99 } 100 101 SourceLocation loc = attr.getLoc(); 102 llvm::StringRef name = attr.getName()->getName(); 103 104 // The GC attributes are usually written with macros; special-case them. 105 if (useInstantiationLoc && loc.isMacroID() && attr.getParameterName()) { 106 if (attr.getParameterName()->isStr("strong")) { 107 if (S.findMacroSpelling(loc, "__strong")) name = "__strong"; 108 } else if (attr.getParameterName()->isStr("weak")) { 109 if (S.findMacroSpelling(loc, "__weak")) name = "__weak"; 110 } 111 } 112 113 S.Diag(loc, diagID) << name << type; 114} 115 116// objc_gc applies to Objective-C pointers or, otherwise, to the 117// smallest available pointer type (i.e. 'void*' in 'void**'). 118#define OBJC_POINTER_TYPE_ATTRS_CASELIST \ 119 case AttributeList::AT_objc_gc: \ 120 case AttributeList::AT_objc_ownership 121 122// Function type attributes. 123#define FUNCTION_TYPE_ATTRS_CASELIST \ 124 case AttributeList::AT_noreturn: \ 125 case AttributeList::AT_cdecl: \ 126 case AttributeList::AT_fastcall: \ 127 case AttributeList::AT_stdcall: \ 128 case AttributeList::AT_thiscall: \ 129 case AttributeList::AT_pascal: \ 130 case AttributeList::AT_regparm: \ 131 case AttributeList::AT_pcs \ 132 133namespace { 134 /// An object which stores processing state for the entire 135 /// GetTypeForDeclarator process. 136 class TypeProcessingState { 137 Sema &sema; 138 139 /// The declarator being processed. 140 Declarator &declarator; 141 142 /// The index of the declarator chunk we're currently processing. 143 /// May be the total number of valid chunks, indicating the 144 /// DeclSpec. 145 unsigned chunkIndex; 146 147 /// Whether there are non-trivial modifications to the decl spec. 148 bool trivial; 149 150 /// Whether we saved the attributes in the decl spec. 151 bool hasSavedAttrs; 152 153 /// The original set of attributes on the DeclSpec. 154 llvm::SmallVector<AttributeList*, 2> savedAttrs; 155 156 /// A list of attributes to diagnose the uselessness of when the 157 /// processing is complete. 158 llvm::SmallVector<AttributeList*, 2> ignoredTypeAttrs; 159 160 public: 161 TypeProcessingState(Sema &sema, Declarator &declarator) 162 : sema(sema), declarator(declarator), 163 chunkIndex(declarator.getNumTypeObjects()), 164 trivial(true), hasSavedAttrs(false) {} 165 166 Sema &getSema() const { 167 return sema; 168 } 169 170 Declarator &getDeclarator() const { 171 return declarator; 172 } 173 174 unsigned getCurrentChunkIndex() const { 175 return chunkIndex; 176 } 177 178 void setCurrentChunkIndex(unsigned idx) { 179 assert(idx <= declarator.getNumTypeObjects()); 180 chunkIndex = idx; 181 } 182 183 AttributeList *&getCurrentAttrListRef() const { 184 assert(chunkIndex <= declarator.getNumTypeObjects()); 185 if (chunkIndex == declarator.getNumTypeObjects()) 186 return getMutableDeclSpec().getAttributes().getListRef(); 187 return declarator.getTypeObject(chunkIndex).getAttrListRef(); 188 } 189 190 /// Save the current set of attributes on the DeclSpec. 191 void saveDeclSpecAttrs() { 192 // Don't try to save them multiple times. 193 if (hasSavedAttrs) return; 194 195 DeclSpec &spec = getMutableDeclSpec(); 196 for (AttributeList *attr = spec.getAttributes().getList(); attr; 197 attr = attr->getNext()) 198 savedAttrs.push_back(attr); 199 trivial &= savedAttrs.empty(); 200 hasSavedAttrs = true; 201 } 202 203 /// Record that we had nowhere to put the given type attribute. 204 /// We will diagnose such attributes later. 205 void addIgnoredTypeAttr(AttributeList &attr) { 206 ignoredTypeAttrs.push_back(&attr); 207 } 208 209 /// Diagnose all the ignored type attributes, given that the 210 /// declarator worked out to the given type. 211 void diagnoseIgnoredTypeAttrs(QualType type) const { 212 for (llvm::SmallVectorImpl<AttributeList*>::const_iterator 213 i = ignoredTypeAttrs.begin(), e = ignoredTypeAttrs.end(); 214 i != e; ++i) 215 diagnoseBadTypeAttribute(getSema(), **i, type); 216 } 217 218 ~TypeProcessingState() { 219 if (trivial) return; 220 221 restoreDeclSpecAttrs(); 222 } 223 224 private: 225 DeclSpec &getMutableDeclSpec() const { 226 return const_cast<DeclSpec&>(declarator.getDeclSpec()); 227 } 228 229 void restoreDeclSpecAttrs() { 230 assert(hasSavedAttrs); 231 232 if (savedAttrs.empty()) { 233 getMutableDeclSpec().getAttributes().set(0); 234 return; 235 } 236 237 getMutableDeclSpec().getAttributes().set(savedAttrs[0]); 238 for (unsigned i = 0, e = savedAttrs.size() - 1; i != e; ++i) 239 savedAttrs[i]->setNext(savedAttrs[i+1]); 240 savedAttrs.back()->setNext(0); 241 } 242 }; 243 244 /// Basically std::pair except that we really want to avoid an 245 /// implicit operator= for safety concerns. It's also a minor 246 /// link-time optimization for this to be a private type. 247 struct AttrAndList { 248 /// The attribute. 249 AttributeList &first; 250 251 /// The head of the list the attribute is currently in. 252 AttributeList *&second; 253 254 AttrAndList(AttributeList &attr, AttributeList *&head) 255 : first(attr), second(head) {} 256 }; 257} 258 259namespace llvm { 260 template <> struct isPodLike<AttrAndList> { 261 static const bool value = true; 262 }; 263} 264 265static void spliceAttrIntoList(AttributeList &attr, AttributeList *&head) { 266 attr.setNext(head); 267 head = &attr; 268} 269 270static void spliceAttrOutOfList(AttributeList &attr, AttributeList *&head) { 271 if (head == &attr) { 272 head = attr.getNext(); 273 return; 274 } 275 276 AttributeList *cur = head; 277 while (true) { 278 assert(cur && cur->getNext() && "ran out of attrs?"); 279 if (cur->getNext() == &attr) { 280 cur->setNext(attr.getNext()); 281 return; 282 } 283 cur = cur->getNext(); 284 } 285} 286 287static void moveAttrFromListToList(AttributeList &attr, 288 AttributeList *&fromList, 289 AttributeList *&toList) { 290 spliceAttrOutOfList(attr, fromList); 291 spliceAttrIntoList(attr, toList); 292} 293 294static void processTypeAttrs(TypeProcessingState &state, 295 QualType &type, bool isDeclSpec, 296 AttributeList *attrs); 297 298static bool handleFunctionTypeAttr(TypeProcessingState &state, 299 AttributeList &attr, 300 QualType &type); 301 302static bool handleObjCGCTypeAttr(TypeProcessingState &state, 303 AttributeList &attr, QualType &type); 304 305static bool handleObjCOwnershipTypeAttr(TypeProcessingState &state, 306 AttributeList &attr, QualType &type); 307 308static bool handleObjCPointerTypeAttr(TypeProcessingState &state, 309 AttributeList &attr, QualType &type) { 310 if (attr.getKind() == AttributeList::AT_objc_gc) 311 return handleObjCGCTypeAttr(state, attr, type); 312 assert(attr.getKind() == AttributeList::AT_objc_ownership); 313 return handleObjCOwnershipTypeAttr(state, attr, type); 314} 315 316/// Given that an objc_gc attribute was written somewhere on a 317/// declaration *other* than on the declarator itself (for which, use 318/// distributeObjCPointerTypeAttrFromDeclarator), and given that it 319/// didn't apply in whatever position it was written in, try to move 320/// it to a more appropriate position. 321static void distributeObjCPointerTypeAttr(TypeProcessingState &state, 322 AttributeList &attr, 323 QualType type) { 324 Declarator &declarator = state.getDeclarator(); 325 for (unsigned i = state.getCurrentChunkIndex(); i != 0; --i) { 326 DeclaratorChunk &chunk = declarator.getTypeObject(i-1); 327 switch (chunk.Kind) { 328 case DeclaratorChunk::Pointer: 329 case DeclaratorChunk::BlockPointer: 330 moveAttrFromListToList(attr, state.getCurrentAttrListRef(), 331 chunk.getAttrListRef()); 332 return; 333 334 case DeclaratorChunk::Paren: 335 case DeclaratorChunk::Array: 336 continue; 337 338 // Don't walk through these. 339 case DeclaratorChunk::Reference: 340 case DeclaratorChunk::Function: 341 case DeclaratorChunk::MemberPointer: 342 goto error; 343 } 344 } 345 error: 346 347 diagnoseBadTypeAttribute(state.getSema(), attr, type); 348} 349 350/// Distribute an objc_gc type attribute that was written on the 351/// declarator. 352static void 353distributeObjCPointerTypeAttrFromDeclarator(TypeProcessingState &state, 354 AttributeList &attr, 355 QualType &declSpecType) { 356 Declarator &declarator = state.getDeclarator(); 357 358 // objc_gc goes on the innermost pointer to something that's not a 359 // pointer. 360 unsigned innermost = -1U; 361 bool considerDeclSpec = true; 362 for (unsigned i = 0, e = declarator.getNumTypeObjects(); i != e; ++i) { 363 DeclaratorChunk &chunk = declarator.getTypeObject(i); 364 switch (chunk.Kind) { 365 case DeclaratorChunk::Pointer: 366 case DeclaratorChunk::BlockPointer: 367 innermost = i; 368 continue; 369 370 case DeclaratorChunk::Reference: 371 case DeclaratorChunk::MemberPointer: 372 case DeclaratorChunk::Paren: 373 case DeclaratorChunk::Array: 374 continue; 375 376 case DeclaratorChunk::Function: 377 considerDeclSpec = false; 378 goto done; 379 } 380 } 381 done: 382 383 // That might actually be the decl spec if we weren't blocked by 384 // anything in the declarator. 385 if (considerDeclSpec) { 386 if (handleObjCPointerTypeAttr(state, attr, declSpecType)) { 387 // Splice the attribute into the decl spec. Prevents the 388 // attribute from being applied multiple times and gives 389 // the source-location-filler something to work with. 390 state.saveDeclSpecAttrs(); 391 moveAttrFromListToList(attr, declarator.getAttrListRef(), 392 declarator.getMutableDeclSpec().getAttributes().getListRef()); 393 return; 394 } 395 } 396 397 // Otherwise, if we found an appropriate chunk, splice the attribute 398 // into it. 399 if (innermost != -1U) { 400 moveAttrFromListToList(attr, declarator.getAttrListRef(), 401 declarator.getTypeObject(innermost).getAttrListRef()); 402 return; 403 } 404 405 // Otherwise, diagnose when we're done building the type. 406 spliceAttrOutOfList(attr, declarator.getAttrListRef()); 407 state.addIgnoredTypeAttr(attr); 408} 409 410/// A function type attribute was written somewhere in a declaration 411/// *other* than on the declarator itself or in the decl spec. Given 412/// that it didn't apply in whatever position it was written in, try 413/// to move it to a more appropriate position. 414static void distributeFunctionTypeAttr(TypeProcessingState &state, 415 AttributeList &attr, 416 QualType type) { 417 Declarator &declarator = state.getDeclarator(); 418 419 // Try to push the attribute from the return type of a function to 420 // the function itself. 421 for (unsigned i = state.getCurrentChunkIndex(); i != 0; --i) { 422 DeclaratorChunk &chunk = declarator.getTypeObject(i-1); 423 switch (chunk.Kind) { 424 case DeclaratorChunk::Function: 425 moveAttrFromListToList(attr, state.getCurrentAttrListRef(), 426 chunk.getAttrListRef()); 427 return; 428 429 case DeclaratorChunk::Paren: 430 case DeclaratorChunk::Pointer: 431 case DeclaratorChunk::BlockPointer: 432 case DeclaratorChunk::Array: 433 case DeclaratorChunk::Reference: 434 case DeclaratorChunk::MemberPointer: 435 continue; 436 } 437 } 438 439 diagnoseBadTypeAttribute(state.getSema(), attr, type); 440} 441 442/// Try to distribute a function type attribute to the innermost 443/// function chunk or type. Returns true if the attribute was 444/// distributed, false if no location was found. 445static bool 446distributeFunctionTypeAttrToInnermost(TypeProcessingState &state, 447 AttributeList &attr, 448 AttributeList *&attrList, 449 QualType &declSpecType) { 450 Declarator &declarator = state.getDeclarator(); 451 452 // Put it on the innermost function chunk, if there is one. 453 for (unsigned i = 0, e = declarator.getNumTypeObjects(); i != e; ++i) { 454 DeclaratorChunk &chunk = declarator.getTypeObject(i); 455 if (chunk.Kind != DeclaratorChunk::Function) continue; 456 457 moveAttrFromListToList(attr, attrList, chunk.getAttrListRef()); 458 return true; 459 } 460 461 if (handleFunctionTypeAttr(state, attr, declSpecType)) { 462 spliceAttrOutOfList(attr, attrList); 463 return true; 464 } 465 466 return false; 467} 468 469/// A function type attribute was written in the decl spec. Try to 470/// apply it somewhere. 471static void 472distributeFunctionTypeAttrFromDeclSpec(TypeProcessingState &state, 473 AttributeList &attr, 474 QualType &declSpecType) { 475 state.saveDeclSpecAttrs(); 476 477 // Try to distribute to the innermost. 478 if (distributeFunctionTypeAttrToInnermost(state, attr, 479 state.getCurrentAttrListRef(), 480 declSpecType)) 481 return; 482 483 // If that failed, diagnose the bad attribute when the declarator is 484 // fully built. 485 state.addIgnoredTypeAttr(attr); 486} 487 488/// A function type attribute was written on the declarator. Try to 489/// apply it somewhere. 490static void 491distributeFunctionTypeAttrFromDeclarator(TypeProcessingState &state, 492 AttributeList &attr, 493 QualType &declSpecType) { 494 Declarator &declarator = state.getDeclarator(); 495 496 // Try to distribute to the innermost. 497 if (distributeFunctionTypeAttrToInnermost(state, attr, 498 declarator.getAttrListRef(), 499 declSpecType)) 500 return; 501 502 // If that failed, diagnose the bad attribute when the declarator is 503 // fully built. 504 spliceAttrOutOfList(attr, declarator.getAttrListRef()); 505 state.addIgnoredTypeAttr(attr); 506} 507 508/// \brief Given that there are attributes written on the declarator 509/// itself, try to distribute any type attributes to the appropriate 510/// declarator chunk. 511/// 512/// These are attributes like the following: 513/// int f ATTR; 514/// int (f ATTR)(); 515/// but not necessarily this: 516/// int f() ATTR; 517static void distributeTypeAttrsFromDeclarator(TypeProcessingState &state, 518 QualType &declSpecType) { 519 // Collect all the type attributes from the declarator itself. 520 assert(state.getDeclarator().getAttributes() && "declarator has no attrs!"); 521 AttributeList *attr = state.getDeclarator().getAttributes(); 522 AttributeList *next; 523 do { 524 next = attr->getNext(); 525 526 switch (attr->getKind()) { 527 OBJC_POINTER_TYPE_ATTRS_CASELIST: 528 distributeObjCPointerTypeAttrFromDeclarator(state, *attr, declSpecType); 529 break; 530 531 case AttributeList::AT_ns_returns_retained: 532 if (!state.getSema().getLangOptions().ObjCAutoRefCount) 533 break; 534 // fallthrough 535 536 FUNCTION_TYPE_ATTRS_CASELIST: 537 distributeFunctionTypeAttrFromDeclarator(state, *attr, declSpecType); 538 break; 539 540 default: 541 break; 542 } 543 } while ((attr = next)); 544} 545 546/// Add a synthetic '()' to a block-literal declarator if it is 547/// required, given the return type. 548static void maybeSynthesizeBlockSignature(TypeProcessingState &state, 549 QualType declSpecType) { 550 Declarator &declarator = state.getDeclarator(); 551 552 // First, check whether the declarator would produce a function, 553 // i.e. whether the innermost semantic chunk is a function. 554 if (declarator.isFunctionDeclarator()) { 555 // If so, make that declarator a prototyped declarator. 556 declarator.getFunctionTypeInfo().hasPrototype = true; 557 return; 558 } 559 560 // If there are any type objects, the type as written won't name a 561 // function, regardless of the decl spec type. This is because a 562 // block signature declarator is always an abstract-declarator, and 563 // abstract-declarators can't just be parentheses chunks. Therefore 564 // we need to build a function chunk unless there are no type 565 // objects and the decl spec type is a function. 566 if (!declarator.getNumTypeObjects() && declSpecType->isFunctionType()) 567 return; 568 569 // Note that there *are* cases with invalid declarators where 570 // declarators consist solely of parentheses. In general, these 571 // occur only in failed efforts to make function declarators, so 572 // faking up the function chunk is still the right thing to do. 573 574 // Otherwise, we need to fake up a function declarator. 575 SourceLocation loc = declarator.getSourceRange().getBegin(); 576 577 // ...and *prepend* it to the declarator. 578 declarator.AddInnermostTypeInfo(DeclaratorChunk::getFunction( 579 /*proto*/ true, 580 /*variadic*/ false, SourceLocation(), 581 /*args*/ 0, 0, 582 /*type quals*/ 0, 583 /*ref-qualifier*/true, SourceLocation(), 584 /*EH*/ EST_None, SourceLocation(), 0, 0, 0, 0, 585 /*parens*/ loc, loc, 586 declarator)); 587 588 // For consistency, make sure the state still has us as processing 589 // the decl spec. 590 assert(state.getCurrentChunkIndex() == declarator.getNumTypeObjects() - 1); 591 state.setCurrentChunkIndex(declarator.getNumTypeObjects()); 592} 593 594/// \brief Convert the specified declspec to the appropriate type 595/// object. 596/// \param D the declarator containing the declaration specifier. 597/// \returns The type described by the declaration specifiers. This function 598/// never returns null. 599static QualType ConvertDeclSpecToType(TypeProcessingState &state) { 600 // FIXME: Should move the logic from DeclSpec::Finish to here for validity 601 // checking. 602 603 Sema &S = state.getSema(); 604 Declarator &declarator = state.getDeclarator(); 605 const DeclSpec &DS = declarator.getDeclSpec(); 606 SourceLocation DeclLoc = declarator.getIdentifierLoc(); 607 if (DeclLoc.isInvalid()) 608 DeclLoc = DS.getSourceRange().getBegin(); 609 610 ASTContext &Context = S.Context; 611 612 QualType Result; 613 switch (DS.getTypeSpecType()) { 614 case DeclSpec::TST_void: 615 Result = Context.VoidTy; 616 break; 617 case DeclSpec::TST_char: 618 if (DS.getTypeSpecSign() == DeclSpec::TSS_unspecified) 619 Result = Context.CharTy; 620 else if (DS.getTypeSpecSign() == DeclSpec::TSS_signed) 621 Result = Context.SignedCharTy; 622 else { 623 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unsigned && 624 "Unknown TSS value"); 625 Result = Context.UnsignedCharTy; 626 } 627 break; 628 case DeclSpec::TST_wchar: 629 if (DS.getTypeSpecSign() == DeclSpec::TSS_unspecified) 630 Result = Context.WCharTy; 631 else if (DS.getTypeSpecSign() == DeclSpec::TSS_signed) { 632 S.Diag(DS.getTypeSpecSignLoc(), diag::ext_invalid_sign_spec) 633 << DS.getSpecifierName(DS.getTypeSpecType()); 634 Result = Context.getSignedWCharType(); 635 } else { 636 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unsigned && 637 "Unknown TSS value"); 638 S.Diag(DS.getTypeSpecSignLoc(), diag::ext_invalid_sign_spec) 639 << DS.getSpecifierName(DS.getTypeSpecType()); 640 Result = Context.getUnsignedWCharType(); 641 } 642 break; 643 case DeclSpec::TST_char16: 644 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unspecified && 645 "Unknown TSS value"); 646 Result = Context.Char16Ty; 647 break; 648 case DeclSpec::TST_char32: 649 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unspecified && 650 "Unknown TSS value"); 651 Result = Context.Char32Ty; 652 break; 653 case DeclSpec::TST_unspecified: 654 // "<proto1,proto2>" is an objc qualified ID with a missing id. 655 if (DeclSpec::ProtocolQualifierListTy PQ = DS.getProtocolQualifiers()) { 656 Result = Context.getObjCObjectType(Context.ObjCBuiltinIdTy, 657 (ObjCProtocolDecl**)PQ, 658 DS.getNumProtocolQualifiers()); 659 Result = Context.getObjCObjectPointerType(Result); 660 break; 661 } 662 663 // If this is a missing declspec in a block literal return context, then it 664 // is inferred from the return statements inside the block. 665 if (isOmittedBlockReturnType(declarator)) { 666 Result = Context.DependentTy; 667 break; 668 } 669 670 // Unspecified typespec defaults to int in C90. However, the C90 grammar 671 // [C90 6.5] only allows a decl-spec if there was *some* type-specifier, 672 // type-qualifier, or storage-class-specifier. If not, emit an extwarn. 673 // Note that the one exception to this is function definitions, which are 674 // allowed to be completely missing a declspec. This is handled in the 675 // parser already though by it pretending to have seen an 'int' in this 676 // case. 677 if (S.getLangOptions().ImplicitInt) { 678 // In C89 mode, we only warn if there is a completely missing declspec 679 // when one is not allowed. 680 if (DS.isEmpty()) { 681 S.Diag(DeclLoc, diag::ext_missing_declspec) 682 << DS.getSourceRange() 683 << FixItHint::CreateInsertion(DS.getSourceRange().getBegin(), "int"); 684 } 685 } else if (!DS.hasTypeSpecifier()) { 686 // C99 and C++ require a type specifier. For example, C99 6.7.2p2 says: 687 // "At least one type specifier shall be given in the declaration 688 // specifiers in each declaration, and in the specifier-qualifier list in 689 // each struct declaration and type name." 690 // FIXME: Does Microsoft really have the implicit int extension in C++? 691 if (S.getLangOptions().CPlusPlus && 692 !S.getLangOptions().Microsoft) { 693 S.Diag(DeclLoc, diag::err_missing_type_specifier) 694 << DS.getSourceRange(); 695 696 // When this occurs in C++ code, often something is very broken with the 697 // value being declared, poison it as invalid so we don't get chains of 698 // errors. 699 declarator.setInvalidType(true); 700 } else { 701 S.Diag(DeclLoc, diag::ext_missing_type_specifier) 702 << DS.getSourceRange(); 703 } 704 } 705 706 // FALL THROUGH. 707 case DeclSpec::TST_int: { 708 if (DS.getTypeSpecSign() != DeclSpec::TSS_unsigned) { 709 switch (DS.getTypeSpecWidth()) { 710 case DeclSpec::TSW_unspecified: Result = Context.IntTy; break; 711 case DeclSpec::TSW_short: Result = Context.ShortTy; break; 712 case DeclSpec::TSW_long: Result = Context.LongTy; break; 713 case DeclSpec::TSW_longlong: 714 Result = Context.LongLongTy; 715 716 // long long is a C99 feature. 717 if (!S.getLangOptions().C99 && 718 !S.getLangOptions().CPlusPlus0x) 719 S.Diag(DS.getTypeSpecWidthLoc(), diag::ext_longlong); 720 break; 721 } 722 } else { 723 switch (DS.getTypeSpecWidth()) { 724 case DeclSpec::TSW_unspecified: Result = Context.UnsignedIntTy; break; 725 case DeclSpec::TSW_short: Result = Context.UnsignedShortTy; break; 726 case DeclSpec::TSW_long: Result = Context.UnsignedLongTy; break; 727 case DeclSpec::TSW_longlong: 728 Result = Context.UnsignedLongLongTy; 729 730 // long long is a C99 feature. 731 if (!S.getLangOptions().C99 && 732 !S.getLangOptions().CPlusPlus0x) 733 S.Diag(DS.getTypeSpecWidthLoc(), diag::ext_longlong); 734 break; 735 } 736 } 737 break; 738 } 739 case DeclSpec::TST_float: Result = Context.FloatTy; break; 740 case DeclSpec::TST_double: 741 if (DS.getTypeSpecWidth() == DeclSpec::TSW_long) 742 Result = Context.LongDoubleTy; 743 else 744 Result = Context.DoubleTy; 745 746 if (S.getLangOptions().OpenCL && !S.getOpenCLOptions().cl_khr_fp64) { 747 S.Diag(DS.getTypeSpecTypeLoc(), diag::err_double_requires_fp64); 748 declarator.setInvalidType(true); 749 } 750 break; 751 case DeclSpec::TST_bool: Result = Context.BoolTy; break; // _Bool or bool 752 case DeclSpec::TST_decimal32: // _Decimal32 753 case DeclSpec::TST_decimal64: // _Decimal64 754 case DeclSpec::TST_decimal128: // _Decimal128 755 S.Diag(DS.getTypeSpecTypeLoc(), diag::err_decimal_unsupported); 756 Result = Context.IntTy; 757 declarator.setInvalidType(true); 758 break; 759 case DeclSpec::TST_class: 760 case DeclSpec::TST_enum: 761 case DeclSpec::TST_union: 762 case DeclSpec::TST_struct: { 763 TypeDecl *D = dyn_cast_or_null<TypeDecl>(DS.getRepAsDecl()); 764 if (!D) { 765 // This can happen in C++ with ambiguous lookups. 766 Result = Context.IntTy; 767 declarator.setInvalidType(true); 768 break; 769 } 770 771 // If the type is deprecated or unavailable, diagnose it. 772 S.DiagnoseUseOfDecl(D, DS.getTypeSpecTypeNameLoc()); 773 774 assert(DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 && 775 DS.getTypeSpecSign() == 0 && "No qualifiers on tag names!"); 776 777 // TypeQuals handled by caller. 778 Result = Context.getTypeDeclType(D); 779 780 // In both C and C++, make an ElaboratedType. 781 ElaboratedTypeKeyword Keyword 782 = ElaboratedType::getKeywordForTypeSpec(DS.getTypeSpecType()); 783 Result = S.getElaboratedType(Keyword, DS.getTypeSpecScope(), Result); 784 785 if (D->isInvalidDecl()) 786 declarator.setInvalidType(true); 787 break; 788 } 789 case DeclSpec::TST_typename: { 790 assert(DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 && 791 DS.getTypeSpecSign() == 0 && 792 "Can't handle qualifiers on typedef names yet!"); 793 Result = S.GetTypeFromParser(DS.getRepAsType()); 794 if (Result.isNull()) 795 declarator.setInvalidType(true); 796 else if (DeclSpec::ProtocolQualifierListTy PQ 797 = DS.getProtocolQualifiers()) { 798 if (const ObjCObjectType *ObjT = Result->getAs<ObjCObjectType>()) { 799 // Silently drop any existing protocol qualifiers. 800 // TODO: determine whether that's the right thing to do. 801 if (ObjT->getNumProtocols()) 802 Result = ObjT->getBaseType(); 803 804 if (DS.getNumProtocolQualifiers()) 805 Result = Context.getObjCObjectType(Result, 806 (ObjCProtocolDecl**) PQ, 807 DS.getNumProtocolQualifiers()); 808 } else if (Result->isObjCIdType()) { 809 // id<protocol-list> 810 Result = Context.getObjCObjectType(Context.ObjCBuiltinIdTy, 811 (ObjCProtocolDecl**) PQ, 812 DS.getNumProtocolQualifiers()); 813 Result = Context.getObjCObjectPointerType(Result); 814 } else if (Result->isObjCClassType()) { 815 // Class<protocol-list> 816 Result = Context.getObjCObjectType(Context.ObjCBuiltinClassTy, 817 (ObjCProtocolDecl**) PQ, 818 DS.getNumProtocolQualifiers()); 819 Result = Context.getObjCObjectPointerType(Result); 820 } else { 821 S.Diag(DeclLoc, diag::err_invalid_protocol_qualifiers) 822 << DS.getSourceRange(); 823 declarator.setInvalidType(true); 824 } 825 } 826 827 // TypeQuals handled by caller. 828 break; 829 } 830 case DeclSpec::TST_typeofType: 831 // FIXME: Preserve type source info. 832 Result = S.GetTypeFromParser(DS.getRepAsType()); 833 assert(!Result.isNull() && "Didn't get a type for typeof?"); 834 if (!Result->isDependentType()) 835 if (const TagType *TT = Result->getAs<TagType>()) 836 S.DiagnoseUseOfDecl(TT->getDecl(), DS.getTypeSpecTypeLoc()); 837 // TypeQuals handled by caller. 838 Result = Context.getTypeOfType(Result); 839 break; 840 case DeclSpec::TST_typeofExpr: { 841 Expr *E = DS.getRepAsExpr(); 842 assert(E && "Didn't get an expression for typeof?"); 843 // TypeQuals handled by caller. 844 Result = S.BuildTypeofExprType(E, DS.getTypeSpecTypeLoc()); 845 if (Result.isNull()) { 846 Result = Context.IntTy; 847 declarator.setInvalidType(true); 848 } 849 break; 850 } 851 case DeclSpec::TST_decltype: { 852 Expr *E = DS.getRepAsExpr(); 853 assert(E && "Didn't get an expression for decltype?"); 854 // TypeQuals handled by caller. 855 Result = S.BuildDecltypeType(E, DS.getTypeSpecTypeLoc()); 856 if (Result.isNull()) { 857 Result = Context.IntTy; 858 declarator.setInvalidType(true); 859 } 860 break; 861 } 862 case DeclSpec::TST_underlyingType: 863 Result = S.GetTypeFromParser(DS.getRepAsType()); 864 assert(!Result.isNull() && "Didn't get a type for __underlying_type?"); 865 Result = S.BuildUnaryTransformType(Result, 866 UnaryTransformType::EnumUnderlyingType, 867 DS.getTypeSpecTypeLoc()); 868 if (Result.isNull()) { 869 Result = Context.IntTy; 870 declarator.setInvalidType(true); 871 } 872 break; 873 874 case DeclSpec::TST_auto: { 875 // TypeQuals handled by caller. 876 Result = Context.getAutoType(QualType()); 877 break; 878 } 879 880 case DeclSpec::TST_unknown_anytype: 881 Result = Context.UnknownAnyTy; 882 break; 883 884 case DeclSpec::TST_error: 885 Result = Context.IntTy; 886 declarator.setInvalidType(true); 887 break; 888 } 889 890 // Handle complex types. 891 if (DS.getTypeSpecComplex() == DeclSpec::TSC_complex) { 892 if (S.getLangOptions().Freestanding) 893 S.Diag(DS.getTypeSpecComplexLoc(), diag::ext_freestanding_complex); 894 Result = Context.getComplexType(Result); 895 } else if (DS.isTypeAltiVecVector()) { 896 unsigned typeSize = static_cast<unsigned>(Context.getTypeSize(Result)); 897 assert(typeSize > 0 && "type size for vector must be greater than 0 bits"); 898 VectorType::VectorKind VecKind = VectorType::AltiVecVector; 899 if (DS.isTypeAltiVecPixel()) 900 VecKind = VectorType::AltiVecPixel; 901 else if (DS.isTypeAltiVecBool()) 902 VecKind = VectorType::AltiVecBool; 903 Result = Context.getVectorType(Result, 128/typeSize, VecKind); 904 } 905 906 // FIXME: Imaginary. 907 if (DS.getTypeSpecComplex() == DeclSpec::TSC_imaginary) 908 S.Diag(DS.getTypeSpecComplexLoc(), diag::err_imaginary_not_supported); 909 910 // Before we process any type attributes, synthesize a block literal 911 // function declarator if necessary. 912 if (declarator.getContext() == Declarator::BlockLiteralContext) 913 maybeSynthesizeBlockSignature(state, Result); 914 915 // Apply any type attributes from the decl spec. This may cause the 916 // list of type attributes to be temporarily saved while the type 917 // attributes are pushed around. 918 if (AttributeList *attrs = DS.getAttributes().getList()) 919 processTypeAttrs(state, Result, true, attrs); 920 921 // Apply const/volatile/restrict qualifiers to T. 922 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 923 924 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 925 // or incomplete types shall not be restrict-qualified." C++ also allows 926 // restrict-qualified references. 927 if (TypeQuals & DeclSpec::TQ_restrict) { 928 if (Result->isAnyPointerType() || Result->isReferenceType()) { 929 QualType EltTy; 930 if (Result->isObjCObjectPointerType()) 931 EltTy = Result; 932 else 933 EltTy = Result->isPointerType() ? 934 Result->getAs<PointerType>()->getPointeeType() : 935 Result->getAs<ReferenceType>()->getPointeeType(); 936 937 // If we have a pointer or reference, the pointee must have an object 938 // incomplete type. 939 if (!EltTy->isIncompleteOrObjectType()) { 940 S.Diag(DS.getRestrictSpecLoc(), 941 diag::err_typecheck_invalid_restrict_invalid_pointee) 942 << EltTy << DS.getSourceRange(); 943 TypeQuals &= ~DeclSpec::TQ_restrict; // Remove the restrict qualifier. 944 } 945 } else { 946 S.Diag(DS.getRestrictSpecLoc(), 947 diag::err_typecheck_invalid_restrict_not_pointer) 948 << Result << DS.getSourceRange(); 949 TypeQuals &= ~DeclSpec::TQ_restrict; // Remove the restrict qualifier. 950 } 951 } 952 953 // Warn about CV qualifiers on functions: C99 6.7.3p8: "If the specification 954 // of a function type includes any type qualifiers, the behavior is 955 // undefined." 956 if (Result->isFunctionType() && TypeQuals) { 957 // Get some location to point at, either the C or V location. 958 SourceLocation Loc; 959 if (TypeQuals & DeclSpec::TQ_const) 960 Loc = DS.getConstSpecLoc(); 961 else if (TypeQuals & DeclSpec::TQ_volatile) 962 Loc = DS.getVolatileSpecLoc(); 963 else { 964 assert((TypeQuals & DeclSpec::TQ_restrict) && 965 "Has CVR quals but not C, V, or R?"); 966 Loc = DS.getRestrictSpecLoc(); 967 } 968 S.Diag(Loc, diag::warn_typecheck_function_qualifiers) 969 << Result << DS.getSourceRange(); 970 } 971 972 // C++ [dcl.ref]p1: 973 // Cv-qualified references are ill-formed except when the 974 // cv-qualifiers are introduced through the use of a typedef 975 // (7.1.3) or of a template type argument (14.3), in which 976 // case the cv-qualifiers are ignored. 977 // FIXME: Shouldn't we be checking SCS_typedef here? 978 if (DS.getTypeSpecType() == DeclSpec::TST_typename && 979 TypeQuals && Result->isReferenceType()) { 980 TypeQuals &= ~DeclSpec::TQ_const; 981 TypeQuals &= ~DeclSpec::TQ_volatile; 982 } 983 984 Qualifiers Quals = Qualifiers::fromCVRMask(TypeQuals); 985 Result = Context.getQualifiedType(Result, Quals); 986 } 987 988 return Result; 989} 990 991static std::string getPrintableNameForEntity(DeclarationName Entity) { 992 if (Entity) 993 return Entity.getAsString(); 994 995 return "type name"; 996} 997 998QualType Sema::BuildQualifiedType(QualType T, SourceLocation Loc, 999 Qualifiers Qs) { 1000 // Enforce C99 6.7.3p2: "Types other than pointer types derived from 1001 // object or incomplete types shall not be restrict-qualified." 1002 if (Qs.hasRestrict()) { 1003 unsigned DiagID = 0; 1004 QualType ProblemTy; 1005 1006 const Type *Ty = T->getCanonicalTypeInternal().getTypePtr(); 1007 if (const ReferenceType *RTy = dyn_cast<ReferenceType>(Ty)) { 1008 if (!RTy->getPointeeType()->isIncompleteOrObjectType()) { 1009 DiagID = diag::err_typecheck_invalid_restrict_invalid_pointee; 1010 ProblemTy = T->getAs<ReferenceType>()->getPointeeType(); 1011 } 1012 } else if (const PointerType *PTy = dyn_cast<PointerType>(Ty)) { 1013 if (!PTy->getPointeeType()->isIncompleteOrObjectType()) { 1014 DiagID = diag::err_typecheck_invalid_restrict_invalid_pointee; 1015 ProblemTy = T->getAs<PointerType>()->getPointeeType(); 1016 } 1017 } else if (const MemberPointerType *PTy = dyn_cast<MemberPointerType>(Ty)) { 1018 if (!PTy->getPointeeType()->isIncompleteOrObjectType()) { 1019 DiagID = diag::err_typecheck_invalid_restrict_invalid_pointee; 1020 ProblemTy = T->getAs<PointerType>()->getPointeeType(); 1021 } 1022 } else if (!Ty->isDependentType()) { 1023 // FIXME: this deserves a proper diagnostic 1024 DiagID = diag::err_typecheck_invalid_restrict_invalid_pointee; 1025 ProblemTy = T; 1026 } 1027 1028 if (DiagID) { 1029 Diag(Loc, DiagID) << ProblemTy; 1030 Qs.removeRestrict(); 1031 } 1032 } 1033 1034 return Context.getQualifiedType(T, Qs); 1035} 1036 1037/// \brief Build a paren type including \p T. 1038QualType Sema::BuildParenType(QualType T) { 1039 return Context.getParenType(T); 1040} 1041 1042/// Given that we're building a pointer or reference to the given 1043static QualType inferARCLifetimeForPointee(Sema &S, QualType type, 1044 SourceLocation loc, 1045 bool isReference) { 1046 // Bail out if retention is unrequired or already specified. 1047 if (!type->isObjCLifetimeType() || 1048 type.getObjCLifetime() != Qualifiers::OCL_None) 1049 return type; 1050 1051 Qualifiers::ObjCLifetime implicitLifetime = Qualifiers::OCL_None; 1052 1053 // If the object type is const-qualified, we can safely use 1054 // __unsafe_unretained. This is safe (because there are no read 1055 // barriers), and it'll be safe to coerce anything but __weak* to 1056 // the resulting type. 1057 if (type.isConstQualified()) { 1058 implicitLifetime = Qualifiers::OCL_ExplicitNone; 1059 1060 // Otherwise, check whether the static type does not require 1061 // retaining. This currently only triggers for Class (possibly 1062 // protocol-qualifed, and arrays thereof). 1063 } else if (type->isObjCARCImplicitlyUnretainedType()) { 1064 implicitLifetime = Qualifiers::OCL_ExplicitNone; 1065 1066 // If that failed, give an error and recover using __autoreleasing. 1067 } else { 1068 // These types can show up in private ivars in system headers, so 1069 // we need this to not be an error in those cases. Instead we 1070 // want to delay. 1071 if (S.DelayedDiagnostics.shouldDelayDiagnostics()) { 1072 S.DelayedDiagnostics.add( 1073 sema::DelayedDiagnostic::makeForbiddenType(loc, 1074 diag::err_arc_indirect_no_ownership, type, isReference)); 1075 } else { 1076 S.Diag(loc, diag::err_arc_indirect_no_ownership) << type << isReference; 1077 } 1078 implicitLifetime = Qualifiers::OCL_Autoreleasing; 1079 } 1080 assert(implicitLifetime && "didn't infer any lifetime!"); 1081 1082 Qualifiers qs; 1083 qs.addObjCLifetime(implicitLifetime); 1084 return S.Context.getQualifiedType(type, qs); 1085} 1086 1087/// \brief Build a pointer type. 1088/// 1089/// \param T The type to which we'll be building a pointer. 1090/// 1091/// \param Loc The location of the entity whose type involves this 1092/// pointer type or, if there is no such entity, the location of the 1093/// type that will have pointer type. 1094/// 1095/// \param Entity The name of the entity that involves the pointer 1096/// type, if known. 1097/// 1098/// \returns A suitable pointer type, if there are no 1099/// errors. Otherwise, returns a NULL type. 1100QualType Sema::BuildPointerType(QualType T, 1101 SourceLocation Loc, DeclarationName Entity) { 1102 if (T->isReferenceType()) { 1103 // C++ 8.3.2p4: There shall be no ... pointers to references ... 1104 Diag(Loc, diag::err_illegal_decl_pointer_to_reference) 1105 << getPrintableNameForEntity(Entity) << T; 1106 return QualType(); 1107 } 1108 1109 assert(!T->isObjCObjectType() && "Should build ObjCObjectPointerType"); 1110 1111 // In ARC, it is forbidden to build pointers to unqualified pointers. 1112 if (getLangOptions().ObjCAutoRefCount) 1113 T = inferARCLifetimeForPointee(*this, T, Loc, /*reference*/ false); 1114 1115 // Build the pointer type. 1116 return Context.getPointerType(T); 1117} 1118 1119/// \brief Build a reference type. 1120/// 1121/// \param T The type to which we'll be building a reference. 1122/// 1123/// \param Loc The location of the entity whose type involves this 1124/// reference type or, if there is no such entity, the location of the 1125/// type that will have reference type. 1126/// 1127/// \param Entity The name of the entity that involves the reference 1128/// type, if known. 1129/// 1130/// \returns A suitable reference type, if there are no 1131/// errors. Otherwise, returns a NULL type. 1132QualType Sema::BuildReferenceType(QualType T, bool SpelledAsLValue, 1133 SourceLocation Loc, 1134 DeclarationName Entity) { 1135 assert(Context.getCanonicalType(T) != Context.OverloadTy && 1136 "Unresolved overloaded function type"); 1137 1138 // C++0x [dcl.ref]p6: 1139 // If a typedef (7.1.3), a type template-parameter (14.3.1), or a 1140 // decltype-specifier (7.1.6.2) denotes a type TR that is a reference to a 1141 // type T, an attempt to create the type "lvalue reference to cv TR" creates 1142 // the type "lvalue reference to T", while an attempt to create the type 1143 // "rvalue reference to cv TR" creates the type TR. 1144 bool LValueRef = SpelledAsLValue || T->getAs<LValueReferenceType>(); 1145 1146 // C++ [dcl.ref]p4: There shall be no references to references. 1147 // 1148 // According to C++ DR 106, references to references are only 1149 // diagnosed when they are written directly (e.g., "int & &"), 1150 // but not when they happen via a typedef: 1151 // 1152 // typedef int& intref; 1153 // typedef intref& intref2; 1154 // 1155 // Parser::ParseDeclaratorInternal diagnoses the case where 1156 // references are written directly; here, we handle the 1157 // collapsing of references-to-references as described in C++0x. 1158 // DR 106 and 540 introduce reference-collapsing into C++98/03. 1159 1160 // C++ [dcl.ref]p1: 1161 // A declarator that specifies the type "reference to cv void" 1162 // is ill-formed. 1163 if (T->isVoidType()) { 1164 Diag(Loc, diag::err_reference_to_void); 1165 return QualType(); 1166 } 1167 1168 // In ARC, it is forbidden to build references to unqualified pointers. 1169 if (getLangOptions().ObjCAutoRefCount) 1170 T = inferARCLifetimeForPointee(*this, T, Loc, /*reference*/ true); 1171 1172 // Handle restrict on references. 1173 if (LValueRef) 1174 return Context.getLValueReferenceType(T, SpelledAsLValue); 1175 return Context.getRValueReferenceType(T); 1176} 1177 1178/// Check whether the specified array size makes the array type a VLA. If so, 1179/// return true, if not, return the size of the array in SizeVal. 1180static bool isArraySizeVLA(Expr *ArraySize, llvm::APSInt &SizeVal, Sema &S) { 1181 // If the size is an ICE, it certainly isn't a VLA. 1182 if (ArraySize->isIntegerConstantExpr(SizeVal, S.Context)) 1183 return false; 1184 1185 // If we're in a GNU mode (like gnu99, but not c99) accept any evaluatable 1186 // value as an extension. 1187 Expr::EvalResult Result; 1188 if (S.LangOpts.GNUMode && ArraySize->Evaluate(Result, S.Context)) { 1189 if (!Result.hasSideEffects() && Result.Val.isInt()) { 1190 SizeVal = Result.Val.getInt(); 1191 S.Diag(ArraySize->getLocStart(), diag::ext_vla_folded_to_constant); 1192 return false; 1193 } 1194 } 1195 1196 return true; 1197} 1198 1199 1200/// \brief Build an array type. 1201/// 1202/// \param T The type of each element in the array. 1203/// 1204/// \param ASM C99 array size modifier (e.g., '*', 'static'). 1205/// 1206/// \param ArraySize Expression describing the size of the array. 1207/// 1208/// \param Loc The location of the entity whose type involves this 1209/// array type or, if there is no such entity, the location of the 1210/// type that will have array type. 1211/// 1212/// \param Entity The name of the entity that involves the array 1213/// type, if known. 1214/// 1215/// \returns A suitable array type, if there are no errors. Otherwise, 1216/// returns a NULL type. 1217QualType Sema::BuildArrayType(QualType T, ArrayType::ArraySizeModifier ASM, 1218 Expr *ArraySize, unsigned Quals, 1219 SourceRange Brackets, DeclarationName Entity) { 1220 1221 SourceLocation Loc = Brackets.getBegin(); 1222 if (getLangOptions().CPlusPlus) { 1223 // C++ [dcl.array]p1: 1224 // T is called the array element type; this type shall not be a reference 1225 // type, the (possibly cv-qualified) type void, a function type or an 1226 // abstract class type. 1227 // 1228 // Note: function types are handled in the common path with C. 1229 if (T->isReferenceType()) { 1230 Diag(Loc, diag::err_illegal_decl_array_of_references) 1231 << getPrintableNameForEntity(Entity) << T; 1232 return QualType(); 1233 } 1234 1235 if (T->isVoidType()) { 1236 Diag(Loc, diag::err_illegal_decl_array_incomplete_type) << T; 1237 return QualType(); 1238 } 1239 1240 if (RequireNonAbstractType(Brackets.getBegin(), T, 1241 diag::err_array_of_abstract_type)) 1242 return QualType(); 1243 1244 } else { 1245 // C99 6.7.5.2p1: If the element type is an incomplete or function type, 1246 // reject it (e.g. void ary[7], struct foo ary[7], void ary[7]()) 1247 if (RequireCompleteType(Loc, T, 1248 diag::err_illegal_decl_array_incomplete_type)) 1249 return QualType(); 1250 } 1251 1252 if (T->isFunctionType()) { 1253 Diag(Loc, diag::err_illegal_decl_array_of_functions) 1254 << getPrintableNameForEntity(Entity) << T; 1255 return QualType(); 1256 } 1257 1258 if (T->getContainedAutoType()) { 1259 Diag(Loc, diag::err_illegal_decl_array_of_auto) 1260 << getPrintableNameForEntity(Entity) << T; 1261 return QualType(); 1262 } 1263 1264 if (const RecordType *EltTy = T->getAs<RecordType>()) { 1265 // If the element type is a struct or union that contains a variadic 1266 // array, accept it as a GNU extension: C99 6.7.2.1p2. 1267 if (EltTy->getDecl()->hasFlexibleArrayMember()) 1268 Diag(Loc, diag::ext_flexible_array_in_array) << T; 1269 } else if (T->isObjCObjectType()) { 1270 Diag(Loc, diag::err_objc_array_of_interfaces) << T; 1271 return QualType(); 1272 } 1273 1274 // Do lvalue-to-rvalue conversions on the array size expression. 1275 if (ArraySize && !ArraySize->isRValue()) { 1276 ExprResult Result = DefaultLvalueConversion(ArraySize); 1277 if (Result.isInvalid()) 1278 return QualType(); 1279 1280 ArraySize = Result.take(); 1281 } 1282 1283 // C99 6.7.5.2p1: The size expression shall have integer type. 1284 // TODO: in theory, if we were insane, we could allow contextual 1285 // conversions to integer type here. 1286 if (ArraySize && !ArraySize->isTypeDependent() && 1287 !ArraySize->getType()->isIntegralOrUnscopedEnumerationType()) { 1288 Diag(ArraySize->getLocStart(), diag::err_array_size_non_int) 1289 << ArraySize->getType() << ArraySize->getSourceRange(); 1290 return QualType(); 1291 } 1292 llvm::APSInt ConstVal(Context.getTypeSize(Context.getSizeType())); 1293 if (!ArraySize) { 1294 if (ASM == ArrayType::Star) 1295 T = Context.getVariableArrayType(T, 0, ASM, Quals, Brackets); 1296 else 1297 T = Context.getIncompleteArrayType(T, ASM, Quals); 1298 } else if (ArraySize->isTypeDependent() || ArraySize->isValueDependent()) { 1299 T = Context.getDependentSizedArrayType(T, ArraySize, ASM, Quals, Brackets); 1300 } else if (!T->isDependentType() && !T->isIncompleteType() && 1301 !T->isConstantSizeType()) { 1302 // C99: an array with an element type that has a non-constant-size is a VLA. 1303 T = Context.getVariableArrayType(T, ArraySize, ASM, Quals, Brackets); 1304 } else if (isArraySizeVLA(ArraySize, ConstVal, *this)) { 1305 // C99: an array with a non-ICE size is a VLA. We accept any expression 1306 // that we can fold to a non-zero positive value as an extension. 1307 T = Context.getVariableArrayType(T, ArraySize, ASM, Quals, Brackets); 1308 } else { 1309 // C99 6.7.5.2p1: If the expression is a constant expression, it shall 1310 // have a value greater than zero. 1311 if (ConstVal.isSigned() && ConstVal.isNegative()) { 1312 if (Entity) 1313 Diag(ArraySize->getLocStart(), diag::err_decl_negative_array_size) 1314 << getPrintableNameForEntity(Entity) << ArraySize->getSourceRange(); 1315 else 1316 Diag(ArraySize->getLocStart(), diag::err_typecheck_negative_array_size) 1317 << ArraySize->getSourceRange(); 1318 return QualType(); 1319 } 1320 if (ConstVal == 0) { 1321 // GCC accepts zero sized static arrays. We allow them when 1322 // we're not in a SFINAE context. 1323 Diag(ArraySize->getLocStart(), 1324 isSFINAEContext()? diag::err_typecheck_zero_array_size 1325 : diag::ext_typecheck_zero_array_size) 1326 << ArraySize->getSourceRange(); 1327 } else if (!T->isDependentType() && !T->isVariablyModifiedType() && 1328 !T->isIncompleteType()) { 1329 // Is the array too large? 1330 unsigned ActiveSizeBits 1331 = ConstantArrayType::getNumAddressingBits(Context, T, ConstVal); 1332 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) 1333 Diag(ArraySize->getLocStart(), diag::err_array_too_large) 1334 << ConstVal.toString(10) 1335 << ArraySize->getSourceRange(); 1336 } 1337 1338 T = Context.getConstantArrayType(T, ConstVal, ASM, Quals); 1339 } 1340 // If this is not C99, extwarn about VLA's and C99 array size modifiers. 1341 if (!getLangOptions().C99) { 1342 if (T->isVariableArrayType()) { 1343 // Prohibit the use of non-POD types in VLAs. 1344 QualType BaseT = Context.getBaseElementType(T); 1345 if (!T->isDependentType() && 1346 !BaseT.isPODType(Context) && 1347 !BaseT->isObjCLifetimeType()) { 1348 Diag(Loc, diag::err_vla_non_pod) 1349 << BaseT; 1350 return QualType(); 1351 } 1352 // Prohibit the use of VLAs during template argument deduction. 1353 else if (isSFINAEContext()) { 1354 Diag(Loc, diag::err_vla_in_sfinae); 1355 return QualType(); 1356 } 1357 // Just extwarn about VLAs. 1358 else 1359 Diag(Loc, diag::ext_vla); 1360 } else if (ASM != ArrayType::Normal || Quals != 0) 1361 Diag(Loc, 1362 getLangOptions().CPlusPlus? diag::err_c99_array_usage_cxx 1363 : diag::ext_c99_array_usage); 1364 } 1365 1366 return T; 1367} 1368 1369/// \brief Build an ext-vector type. 1370/// 1371/// Run the required checks for the extended vector type. 1372QualType Sema::BuildExtVectorType(QualType T, Expr *ArraySize, 1373 SourceLocation AttrLoc) { 1374 // unlike gcc's vector_size attribute, we do not allow vectors to be defined 1375 // in conjunction with complex types (pointers, arrays, functions, etc.). 1376 if (!T->isDependentType() && 1377 !T->isIntegerType() && !T->isRealFloatingType()) { 1378 Diag(AttrLoc, diag::err_attribute_invalid_vector_type) << T; 1379 return QualType(); 1380 } 1381 1382 if (!ArraySize->isTypeDependent() && !ArraySize->isValueDependent()) { 1383 llvm::APSInt vecSize(32); 1384 if (!ArraySize->isIntegerConstantExpr(vecSize, Context)) { 1385 Diag(AttrLoc, diag::err_attribute_argument_not_int) 1386 << "ext_vector_type" << ArraySize->getSourceRange(); 1387 return QualType(); 1388 } 1389 1390 // unlike gcc's vector_size attribute, the size is specified as the 1391 // number of elements, not the number of bytes. 1392 unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue()); 1393 1394 if (vectorSize == 0) { 1395 Diag(AttrLoc, diag::err_attribute_zero_size) 1396 << ArraySize->getSourceRange(); 1397 return QualType(); 1398 } 1399 1400 return Context.getExtVectorType(T, vectorSize); 1401 } 1402 1403 return Context.getDependentSizedExtVectorType(T, ArraySize, AttrLoc); 1404} 1405 1406/// \brief Build a function type. 1407/// 1408/// This routine checks the function type according to C++ rules and 1409/// under the assumption that the result type and parameter types have 1410/// just been instantiated from a template. It therefore duplicates 1411/// some of the behavior of GetTypeForDeclarator, but in a much 1412/// simpler form that is only suitable for this narrow use case. 1413/// 1414/// \param T The return type of the function. 1415/// 1416/// \param ParamTypes The parameter types of the function. This array 1417/// will be modified to account for adjustments to the types of the 1418/// function parameters. 1419/// 1420/// \param NumParamTypes The number of parameter types in ParamTypes. 1421/// 1422/// \param Variadic Whether this is a variadic function type. 1423/// 1424/// \param Quals The cvr-qualifiers to be applied to the function type. 1425/// 1426/// \param Loc The location of the entity whose type involves this 1427/// function type or, if there is no such entity, the location of the 1428/// type that will have function type. 1429/// 1430/// \param Entity The name of the entity that involves the function 1431/// type, if known. 1432/// 1433/// \returns A suitable function type, if there are no 1434/// errors. Otherwise, returns a NULL type. 1435QualType Sema::BuildFunctionType(QualType T, 1436 QualType *ParamTypes, 1437 unsigned NumParamTypes, 1438 bool Variadic, unsigned Quals, 1439 RefQualifierKind RefQualifier, 1440 SourceLocation Loc, DeclarationName Entity, 1441 FunctionType::ExtInfo Info) { 1442 if (T->isArrayType() || T->isFunctionType()) { 1443 Diag(Loc, diag::err_func_returning_array_function) 1444 << T->isFunctionType() << T; 1445 return QualType(); 1446 } 1447 1448 bool Invalid = false; 1449 for (unsigned Idx = 0; Idx < NumParamTypes; ++Idx) { 1450 QualType ParamType = adjustParameterType(ParamTypes[Idx]); 1451 if (ParamType->isVoidType()) { 1452 Diag(Loc, diag::err_param_with_void_type); 1453 Invalid = true; 1454 } 1455 1456 ParamTypes[Idx] = ParamType; 1457 } 1458 1459 if (Invalid) 1460 return QualType(); 1461 1462 FunctionProtoType::ExtProtoInfo EPI; 1463 EPI.Variadic = Variadic; 1464 EPI.TypeQuals = Quals; 1465 EPI.RefQualifier = RefQualifier; 1466 EPI.ExtInfo = Info; 1467 1468 return Context.getFunctionType(T, ParamTypes, NumParamTypes, EPI); 1469} 1470 1471/// \brief Build a member pointer type \c T Class::*. 1472/// 1473/// \param T the type to which the member pointer refers. 1474/// \param Class the class type into which the member pointer points. 1475/// \param CVR Qualifiers applied to the member pointer type 1476/// \param Loc the location where this type begins 1477/// \param Entity the name of the entity that will have this member pointer type 1478/// 1479/// \returns a member pointer type, if successful, or a NULL type if there was 1480/// an error. 1481QualType Sema::BuildMemberPointerType(QualType T, QualType Class, 1482 SourceLocation Loc, 1483 DeclarationName Entity) { 1484 // Verify that we're not building a pointer to pointer to function with 1485 // exception specification. 1486 if (CheckDistantExceptionSpec(T)) { 1487 Diag(Loc, diag::err_distant_exception_spec); 1488 1489 // FIXME: If we're doing this as part of template instantiation, 1490 // we should return immediately. 1491 1492 // Build the type anyway, but use the canonical type so that the 1493 // exception specifiers are stripped off. 1494 T = Context.getCanonicalType(T); 1495 } 1496 1497 // C++ 8.3.3p3: A pointer to member shall not point to ... a member 1498 // with reference type, or "cv void." 1499 if (T->isReferenceType()) { 1500 Diag(Loc, diag::err_illegal_decl_mempointer_to_reference) 1501 << (Entity? Entity.getAsString() : "type name") << T; 1502 return QualType(); 1503 } 1504 1505 if (T->isVoidType()) { 1506 Diag(Loc, diag::err_illegal_decl_mempointer_to_void) 1507 << (Entity? Entity.getAsString() : "type name"); 1508 return QualType(); 1509 } 1510 1511 if (!Class->isDependentType() && !Class->isRecordType()) { 1512 Diag(Loc, diag::err_mempointer_in_nonclass_type) << Class; 1513 return QualType(); 1514 } 1515 1516 // In the Microsoft ABI, the class is allowed to be an incomplete 1517 // type. In such cases, the compiler makes a worst-case assumption. 1518 // We make no such assumption right now, so emit an error if the 1519 // class isn't a complete type. 1520 if (Context.Target.getCXXABI() == CXXABI_Microsoft && 1521 RequireCompleteType(Loc, Class, diag::err_incomplete_type)) 1522 return QualType(); 1523 1524 return Context.getMemberPointerType(T, Class.getTypePtr()); 1525} 1526 1527/// \brief Build a block pointer type. 1528/// 1529/// \param T The type to which we'll be building a block pointer. 1530/// 1531/// \param CVR The cvr-qualifiers to be applied to the block pointer type. 1532/// 1533/// \param Loc The location of the entity whose type involves this 1534/// block pointer type or, if there is no such entity, the location of the 1535/// type that will have block pointer type. 1536/// 1537/// \param Entity The name of the entity that involves the block pointer 1538/// type, if known. 1539/// 1540/// \returns A suitable block pointer type, if there are no 1541/// errors. Otherwise, returns a NULL type. 1542QualType Sema::BuildBlockPointerType(QualType T, 1543 SourceLocation Loc, 1544 DeclarationName Entity) { 1545 if (!T->isFunctionType()) { 1546 Diag(Loc, diag::err_nonfunction_block_type); 1547 return QualType(); 1548 } 1549 1550 return Context.getBlockPointerType(T); 1551} 1552 1553QualType Sema::GetTypeFromParser(ParsedType Ty, TypeSourceInfo **TInfo) { 1554 QualType QT = Ty.get(); 1555 if (QT.isNull()) { 1556 if (TInfo) *TInfo = 0; 1557 return QualType(); 1558 } 1559 1560 TypeSourceInfo *DI = 0; 1561 if (const LocInfoType *LIT = dyn_cast<LocInfoType>(QT)) { 1562 QT = LIT->getType(); 1563 DI = LIT->getTypeSourceInfo(); 1564 } 1565 1566 if (TInfo) *TInfo = DI; 1567 return QT; 1568} 1569 1570static void transferARCOwnershipToDeclaratorChunk(TypeProcessingState &state, 1571 Qualifiers::ObjCLifetime ownership, 1572 unsigned chunkIndex); 1573 1574/// Given that this is the declaration of a parameter under ARC, 1575/// attempt to infer attributes and such for pointer-to-whatever 1576/// types. 1577static void inferARCWriteback(TypeProcessingState &state, 1578 QualType &declSpecType) { 1579 Sema &S = state.getSema(); 1580 Declarator &declarator = state.getDeclarator(); 1581 1582 // TODO: should we care about decl qualifiers? 1583 1584 // Check whether the declarator has the expected form. We walk 1585 // from the inside out in order to make the block logic work. 1586 unsigned outermostPointerIndex = 0; 1587 bool isBlockPointer = false; 1588 unsigned numPointers = 0; 1589 for (unsigned i = 0, e = declarator.getNumTypeObjects(); i != e; ++i) { 1590 unsigned chunkIndex = i; 1591 DeclaratorChunk &chunk = declarator.getTypeObject(chunkIndex); 1592 switch (chunk.Kind) { 1593 case DeclaratorChunk::Paren: 1594 // Ignore parens. 1595 break; 1596 1597 case DeclaratorChunk::Reference: 1598 case DeclaratorChunk::Pointer: 1599 // Count the number of pointers. Treat references 1600 // interchangeably as pointers; if they're mis-ordered, normal 1601 // type building will discover that. 1602 outermostPointerIndex = chunkIndex; 1603 numPointers++; 1604 break; 1605 1606 case DeclaratorChunk::BlockPointer: 1607 // If we have a pointer to block pointer, that's an acceptable 1608 // indirect reference; anything else is not an application of 1609 // the rules. 1610 if (numPointers != 1) return; 1611 numPointers++; 1612 outermostPointerIndex = chunkIndex; 1613 isBlockPointer = true; 1614 1615 // We don't care about pointer structure in return values here. 1616 goto done; 1617 1618 case DeclaratorChunk::Array: // suppress if written (id[])? 1619 case DeclaratorChunk::Function: 1620 case DeclaratorChunk::MemberPointer: 1621 return; 1622 } 1623 } 1624 done: 1625 1626 // If we have *one* pointer, then we want to throw the qualifier on 1627 // the declaration-specifiers, which means that it needs to be a 1628 // retainable object type. 1629 if (numPointers == 1) { 1630 // If it's not a retainable object type, the rule doesn't apply. 1631 if (!declSpecType->isObjCRetainableType()) return; 1632 1633 // If it already has lifetime, don't do anything. 1634 if (declSpecType.getObjCLifetime()) return; 1635 1636 // Otherwise, modify the type in-place. 1637 Qualifiers qs; 1638 1639 if (declSpecType->isObjCARCImplicitlyUnretainedType()) 1640 qs.addObjCLifetime(Qualifiers::OCL_ExplicitNone); 1641 else 1642 qs.addObjCLifetime(Qualifiers::OCL_Autoreleasing); 1643 declSpecType = S.Context.getQualifiedType(declSpecType, qs); 1644 1645 // If we have *two* pointers, then we want to throw the qualifier on 1646 // the outermost pointer. 1647 } else if (numPointers == 2) { 1648 // If we don't have a block pointer, we need to check whether the 1649 // declaration-specifiers gave us something that will turn into a 1650 // retainable object pointer after we slap the first pointer on it. 1651 if (!isBlockPointer && !declSpecType->isObjCObjectType()) 1652 return; 1653 1654 // Look for an explicit lifetime attribute there. 1655 DeclaratorChunk &chunk = declarator.getTypeObject(outermostPointerIndex); 1656 if (chunk.Kind != DeclaratorChunk::Pointer && 1657 chunk.Kind != DeclaratorChunk::BlockPointer) 1658 return; 1659 for (const AttributeList *attr = chunk.getAttrs(); attr; 1660 attr = attr->getNext()) 1661 if (attr->getKind() == AttributeList::AT_objc_ownership) 1662 return; 1663 1664 transferARCOwnershipToDeclaratorChunk(state, Qualifiers::OCL_Autoreleasing, 1665 outermostPointerIndex); 1666 1667 // Any other number of pointers/references does not trigger the rule. 1668 } else return; 1669 1670 // TODO: mark whether we did this inference? 1671} 1672 1673static void DiagnoseIgnoredQualifiers(unsigned Quals, 1674 SourceLocation ConstQualLoc, 1675 SourceLocation VolatileQualLoc, 1676 SourceLocation RestrictQualLoc, 1677 Sema& S) { 1678 std::string QualStr; 1679 unsigned NumQuals = 0; 1680 SourceLocation Loc; 1681 1682 FixItHint ConstFixIt; 1683 FixItHint VolatileFixIt; 1684 FixItHint RestrictFixIt; 1685 1686 const SourceManager &SM = S.getSourceManager(); 1687 1688 // FIXME: The locations here are set kind of arbitrarily. It'd be nicer to 1689 // find a range and grow it to encompass all the qualifiers, regardless of 1690 // the order in which they textually appear. 1691 if (Quals & Qualifiers::Const) { 1692 ConstFixIt = FixItHint::CreateRemoval(ConstQualLoc); 1693 QualStr = "const"; 1694 ++NumQuals; 1695 if (!Loc.isValid() || SM.isBeforeInTranslationUnit(ConstQualLoc, Loc)) 1696 Loc = ConstQualLoc; 1697 } 1698 if (Quals & Qualifiers::Volatile) { 1699 VolatileFixIt = FixItHint::CreateRemoval(VolatileQualLoc); 1700 QualStr += (NumQuals == 0 ? "volatile" : " volatile"); 1701 ++NumQuals; 1702 if (!Loc.isValid() || SM.isBeforeInTranslationUnit(VolatileQualLoc, Loc)) 1703 Loc = VolatileQualLoc; 1704 } 1705 if (Quals & Qualifiers::Restrict) { 1706 RestrictFixIt = FixItHint::CreateRemoval(RestrictQualLoc); 1707 QualStr += (NumQuals == 0 ? "restrict" : " restrict"); 1708 ++NumQuals; 1709 if (!Loc.isValid() || SM.isBeforeInTranslationUnit(RestrictQualLoc, Loc)) 1710 Loc = RestrictQualLoc; 1711 } 1712 1713 assert(NumQuals > 0 && "No known qualifiers?"); 1714 1715 S.Diag(Loc, diag::warn_qual_return_type) 1716 << QualStr << NumQuals << ConstFixIt << VolatileFixIt << RestrictFixIt; 1717} 1718 1719static QualType GetDeclSpecTypeForDeclarator(TypeProcessingState &state, 1720 TypeSourceInfo *&ReturnTypeInfo) { 1721 Sema &SemaRef = state.getSema(); 1722 Declarator &D = state.getDeclarator(); 1723 QualType T; 1724 ReturnTypeInfo = 0; 1725 1726 // The TagDecl owned by the DeclSpec. 1727 TagDecl *OwnedTagDecl = 0; 1728 1729 switch (D.getName().getKind()) { 1730 case UnqualifiedId::IK_OperatorFunctionId: 1731 case UnqualifiedId::IK_Identifier: 1732 case UnqualifiedId::IK_LiteralOperatorId: 1733 case UnqualifiedId::IK_TemplateId: 1734 T = ConvertDeclSpecToType(state); 1735 1736 if (!D.isInvalidType() && D.getDeclSpec().isTypeSpecOwned()) { 1737 OwnedTagDecl = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 1738 // Owned declaration is embedded in declarator. 1739 OwnedTagDecl->setEmbeddedInDeclarator(true); 1740 } 1741 break; 1742 1743 case UnqualifiedId::IK_ConstructorName: 1744 case UnqualifiedId::IK_ConstructorTemplateId: 1745 case UnqualifiedId::IK_DestructorName: 1746 // Constructors and destructors don't have return types. Use 1747 // "void" instead. 1748 T = SemaRef.Context.VoidTy; 1749 break; 1750 1751 case UnqualifiedId::IK_ConversionFunctionId: 1752 // The result type of a conversion function is the type that it 1753 // converts to. 1754 T = SemaRef.GetTypeFromParser(D.getName().ConversionFunctionId, 1755 &ReturnTypeInfo); 1756 break; 1757 } 1758 1759 if (D.getAttributes()) 1760 distributeTypeAttrsFromDeclarator(state, T); 1761 1762 // C++0x [dcl.spec.auto]p5: reject 'auto' if it is not in an allowed context. 1763 // In C++0x, a function declarator using 'auto' must have a trailing return 1764 // type (this is checked later) and we can skip this. In other languages 1765 // using auto, we need to check regardless. 1766 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto && 1767 (!SemaRef.getLangOptions().CPlusPlus0x || !D.isFunctionDeclarator())) { 1768 int Error = -1; 1769 1770 switch (D.getContext()) { 1771 case Declarator::KNRTypeListContext: 1772 assert(0 && "K&R type lists aren't allowed in C++"); 1773 break; 1774 case Declarator::ObjCPrototypeContext: 1775 case Declarator::PrototypeContext: 1776 Error = 0; // Function prototype 1777 break; 1778 case Declarator::MemberContext: 1779 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_static) 1780 break; 1781 switch (cast<TagDecl>(SemaRef.CurContext)->getTagKind()) { 1782 case TTK_Enum: assert(0 && "unhandled tag kind"); break; 1783 case TTK_Struct: Error = 1; /* Struct member */ break; 1784 case TTK_Union: Error = 2; /* Union member */ break; 1785 case TTK_Class: Error = 3; /* Class member */ break; 1786 } 1787 break; 1788 case Declarator::CXXCatchContext: 1789 case Declarator::ObjCCatchContext: 1790 Error = 4; // Exception declaration 1791 break; 1792 case Declarator::TemplateParamContext: 1793 Error = 5; // Template parameter 1794 break; 1795 case Declarator::BlockLiteralContext: 1796 Error = 6; // Block literal 1797 break; 1798 case Declarator::TemplateTypeArgContext: 1799 Error = 7; // Template type argument 1800 break; 1801 case Declarator::AliasDeclContext: 1802 case Declarator::AliasTemplateContext: 1803 Error = 9; // Type alias 1804 break; 1805 case Declarator::TypeNameContext: 1806 Error = 11; // Generic 1807 break; 1808 case Declarator::FileContext: 1809 case Declarator::BlockContext: 1810 case Declarator::ForContext: 1811 case Declarator::ConditionContext: 1812 case Declarator::CXXNewContext: 1813 break; 1814 } 1815 1816 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 1817 Error = 8; 1818 1819 // In Objective-C it is an error to use 'auto' on a function declarator. 1820 if (D.isFunctionDeclarator()) 1821 Error = 10; 1822 1823 // C++0x [dcl.spec.auto]p2: 'auto' is always fine if the declarator 1824 // contains a trailing return type. That is only legal at the outermost 1825 // level. Check all declarator chunks (outermost first) anyway, to give 1826 // better diagnostics. 1827 if (SemaRef.getLangOptions().CPlusPlus0x && Error != -1) { 1828 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 1829 unsigned chunkIndex = e - i - 1; 1830 state.setCurrentChunkIndex(chunkIndex); 1831 DeclaratorChunk &DeclType = D.getTypeObject(chunkIndex); 1832 if (DeclType.Kind == DeclaratorChunk::Function) { 1833 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun; 1834 if (FTI.TrailingReturnType) { 1835 Error = -1; 1836 break; 1837 } 1838 } 1839 } 1840 } 1841 1842 if (Error != -1) { 1843 SemaRef.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 1844 diag::err_auto_not_allowed) 1845 << Error; 1846 T = SemaRef.Context.IntTy; 1847 D.setInvalidType(true); 1848 } 1849 } 1850 1851 if (SemaRef.getLangOptions().CPlusPlus && 1852 OwnedTagDecl && OwnedTagDecl->isDefinition()) { 1853 // Check the contexts where C++ forbids the declaration of a new class 1854 // or enumeration in a type-specifier-seq. 1855 switch (D.getContext()) { 1856 case Declarator::FileContext: 1857 case Declarator::MemberContext: 1858 case Declarator::BlockContext: 1859 case Declarator::ForContext: 1860 case Declarator::BlockLiteralContext: 1861 // C++0x [dcl.type]p3: 1862 // A type-specifier-seq shall not define a class or enumeration unless 1863 // it appears in the type-id of an alias-declaration (7.1.3) that is not 1864 // the declaration of a template-declaration. 1865 case Declarator::AliasDeclContext: 1866 break; 1867 case Declarator::AliasTemplateContext: 1868 SemaRef.Diag(OwnedTagDecl->getLocation(), 1869 diag::err_type_defined_in_alias_template) 1870 << SemaRef.Context.getTypeDeclType(OwnedTagDecl); 1871 break; 1872 case Declarator::TypeNameContext: 1873 case Declarator::TemplateParamContext: 1874 case Declarator::CXXNewContext: 1875 case Declarator::CXXCatchContext: 1876 case Declarator::ObjCCatchContext: 1877 case Declarator::TemplateTypeArgContext: 1878 SemaRef.Diag(OwnedTagDecl->getLocation(), 1879 diag::err_type_defined_in_type_specifier) 1880 << SemaRef.Context.getTypeDeclType(OwnedTagDecl); 1881 break; 1882 case Declarator::PrototypeContext: 1883 case Declarator::ObjCPrototypeContext: 1884 case Declarator::KNRTypeListContext: 1885 // C++ [dcl.fct]p6: 1886 // Types shall not be defined in return or parameter types. 1887 SemaRef.Diag(OwnedTagDecl->getLocation(), 1888 diag::err_type_defined_in_param_type) 1889 << SemaRef.Context.getTypeDeclType(OwnedTagDecl); 1890 break; 1891 case Declarator::ConditionContext: 1892 // C++ 6.4p2: 1893 // The type-specifier-seq shall not contain typedef and shall not declare 1894 // a new class or enumeration. 1895 SemaRef.Diag(OwnedTagDecl->getLocation(), 1896 diag::err_type_defined_in_condition); 1897 break; 1898 } 1899 } 1900 1901 return T; 1902} 1903 1904static TypeSourceInfo *GetFullTypeForDeclarator(TypeProcessingState &state, 1905 QualType declSpecType, 1906 TypeSourceInfo *TInfo) { 1907 1908 QualType T = declSpecType; 1909 Declarator &D = state.getDeclarator(); 1910 Sema &S = state.getSema(); 1911 ASTContext &Context = S.Context; 1912 const LangOptions &LangOpts = S.getLangOptions(); 1913 1914 bool ImplicitlyNoexcept = false; 1915 if (D.getName().getKind() == UnqualifiedId::IK_OperatorFunctionId && 1916 LangOpts.CPlusPlus0x) { 1917 OverloadedOperatorKind OO = D.getName().OperatorFunctionId.Operator; 1918 /// In C++0x, deallocation functions (normal and array operator delete) 1919 /// are implicitly noexcept. 1920 if (OO == OO_Delete || OO == OO_Array_Delete) 1921 ImplicitlyNoexcept = true; 1922 } 1923 1924 // The name we're declaring, if any. 1925 DeclarationName Name; 1926 if (D.getIdentifier()) 1927 Name = D.getIdentifier(); 1928 1929 // Does this declaration declare a typedef-name? 1930 bool IsTypedefName = 1931 D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef || 1932 D.getContext() == Declarator::AliasDeclContext || 1933 D.getContext() == Declarator::AliasTemplateContext; 1934 1935 // Walk the DeclTypeInfo, building the recursive type as we go. 1936 // DeclTypeInfos are ordered from the identifier out, which is 1937 // opposite of what we want :). 1938 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 1939 unsigned chunkIndex = e - i - 1; 1940 state.setCurrentChunkIndex(chunkIndex); 1941 DeclaratorChunk &DeclType = D.getTypeObject(chunkIndex); 1942 switch (DeclType.Kind) { 1943 default: assert(0 && "Unknown decltype!"); 1944 case DeclaratorChunk::Paren: 1945 T = S.BuildParenType(T); 1946 break; 1947 case DeclaratorChunk::BlockPointer: 1948 // If blocks are disabled, emit an error. 1949 if (!LangOpts.Blocks) 1950 S.Diag(DeclType.Loc, diag::err_blocks_disable); 1951 1952 T = S.BuildBlockPointerType(T, D.getIdentifierLoc(), Name); 1953 if (DeclType.Cls.TypeQuals) 1954 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Cls.TypeQuals); 1955 break; 1956 case DeclaratorChunk::Pointer: 1957 // Verify that we're not building a pointer to pointer to function with 1958 // exception specification. 1959 if (LangOpts.CPlusPlus && S.CheckDistantExceptionSpec(T)) { 1960 S.Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 1961 D.setInvalidType(true); 1962 // Build the type anyway. 1963 } 1964 if (LangOpts.ObjC1 && T->getAs<ObjCObjectType>()) { 1965 T = Context.getObjCObjectPointerType(T); 1966 if (DeclType.Ptr.TypeQuals) 1967 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Ptr.TypeQuals); 1968 break; 1969 } 1970 T = S.BuildPointerType(T, DeclType.Loc, Name); 1971 if (DeclType.Ptr.TypeQuals) 1972 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Ptr.TypeQuals); 1973 1974 break; 1975 case DeclaratorChunk::Reference: { 1976 // Verify that we're not building a reference to pointer to function with 1977 // exception specification. 1978 if (LangOpts.CPlusPlus && S.CheckDistantExceptionSpec(T)) { 1979 S.Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 1980 D.setInvalidType(true); 1981 // Build the type anyway. 1982 } 1983 T = S.BuildReferenceType(T, DeclType.Ref.LValueRef, DeclType.Loc, Name); 1984 1985 Qualifiers Quals; 1986 if (DeclType.Ref.HasRestrict) 1987 T = S.BuildQualifiedType(T, DeclType.Loc, Qualifiers::Restrict); 1988 break; 1989 } 1990 case DeclaratorChunk::Array: { 1991 // Verify that we're not building an array of pointers to function with 1992 // exception specification. 1993 if (LangOpts.CPlusPlus && S.CheckDistantExceptionSpec(T)) { 1994 S.Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 1995 D.setInvalidType(true); 1996 // Build the type anyway. 1997 } 1998 DeclaratorChunk::ArrayTypeInfo &ATI = DeclType.Arr; 1999 Expr *ArraySize = static_cast<Expr*>(ATI.NumElts); 2000 ArrayType::ArraySizeModifier ASM; 2001 if (ATI.isStar) 2002 ASM = ArrayType::Star; 2003 else if (ATI.hasStatic) 2004 ASM = ArrayType::Static; 2005 else 2006 ASM = ArrayType::Normal; 2007 if (ASM == ArrayType::Star && !D.isPrototypeContext()) { 2008 // FIXME: This check isn't quite right: it allows star in prototypes 2009 // for function definitions, and disallows some edge cases detailed 2010 // in http://gcc.gnu.org/ml/gcc-patches/2009-02/msg00133.html 2011 S.Diag(DeclType.Loc, diag::err_array_star_outside_prototype); 2012 ASM = ArrayType::Normal; 2013 D.setInvalidType(true); 2014 } 2015 T = S.BuildArrayType(T, ASM, ArraySize, 2016 Qualifiers::fromCVRMask(ATI.TypeQuals), 2017 SourceRange(DeclType.Loc, DeclType.EndLoc), Name); 2018 break; 2019 } 2020 case DeclaratorChunk::Function: { 2021 // If the function declarator has a prototype (i.e. it is not () and 2022 // does not have a K&R-style identifier list), then the arguments are part 2023 // of the type, otherwise the argument list is (). 2024 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun; 2025 2026 // Check for auto functions and trailing return type and adjust the 2027 // return type accordingly. 2028 if (!D.isInvalidType()) { 2029 // trailing-return-type is only required if we're declaring a function, 2030 // and not, for instance, a pointer to a function. 2031 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto && 2032 !FTI.TrailingReturnType && chunkIndex == 0) { 2033 S.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 2034 diag::err_auto_missing_trailing_return); 2035 T = Context.IntTy; 2036 D.setInvalidType(true); 2037 } else if (FTI.TrailingReturnType) { 2038 // T must be exactly 'auto' at this point. See CWG issue 681. 2039 if (isa<ParenType>(T)) { 2040 S.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 2041 diag::err_trailing_return_in_parens) 2042 << T << D.getDeclSpec().getSourceRange(); 2043 D.setInvalidType(true); 2044 } else if (T.hasQualifiers() || !isa<AutoType>(T)) { 2045 S.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 2046 diag::err_trailing_return_without_auto) 2047 << T << D.getDeclSpec().getSourceRange(); 2048 D.setInvalidType(true); 2049 } 2050 2051 T = S.GetTypeFromParser( 2052 ParsedType::getFromOpaquePtr(FTI.TrailingReturnType), 2053 &TInfo); 2054 } 2055 } 2056 2057 // C99 6.7.5.3p1: The return type may not be a function or array type. 2058 // For conversion functions, we'll diagnose this particular error later. 2059 if ((T->isArrayType() || T->isFunctionType()) && 2060 (D.getName().getKind() != UnqualifiedId::IK_ConversionFunctionId)) { 2061 unsigned diagID = diag::err_func_returning_array_function; 2062 // Last processing chunk in block context means this function chunk 2063 // represents the block. 2064 if (chunkIndex == 0 && 2065 D.getContext() == Declarator::BlockLiteralContext) 2066 diagID = diag::err_block_returning_array_function; 2067 S.Diag(DeclType.Loc, diagID) << T->isFunctionType() << T; 2068 T = Context.IntTy; 2069 D.setInvalidType(true); 2070 } 2071 2072 // cv-qualifiers on return types are pointless except when the type is a 2073 // class type in C++. 2074 if (isa<PointerType>(T) && T.getLocalCVRQualifiers() && 2075 (D.getName().getKind() != UnqualifiedId::IK_ConversionFunctionId) && 2076 (!LangOpts.CPlusPlus || !T->isDependentType())) { 2077 assert(chunkIndex + 1 < e && "No DeclaratorChunk for the return type?"); 2078 DeclaratorChunk ReturnTypeChunk = D.getTypeObject(chunkIndex + 1); 2079 assert(ReturnTypeChunk.Kind == DeclaratorChunk::Pointer); 2080 2081 DeclaratorChunk::PointerTypeInfo &PTI = ReturnTypeChunk.Ptr; 2082 2083 DiagnoseIgnoredQualifiers(PTI.TypeQuals, 2084 SourceLocation::getFromRawEncoding(PTI.ConstQualLoc), 2085 SourceLocation::getFromRawEncoding(PTI.VolatileQualLoc), 2086 SourceLocation::getFromRawEncoding(PTI.RestrictQualLoc), 2087 S); 2088 2089 } else if (T.getCVRQualifiers() && D.getDeclSpec().getTypeQualifiers() && 2090 (!LangOpts.CPlusPlus || 2091 (!T->isDependentType() && !T->isRecordType()))) { 2092 2093 DiagnoseIgnoredQualifiers(D.getDeclSpec().getTypeQualifiers(), 2094 D.getDeclSpec().getConstSpecLoc(), 2095 D.getDeclSpec().getVolatileSpecLoc(), 2096 D.getDeclSpec().getRestrictSpecLoc(), 2097 S); 2098 } 2099 2100 if (LangOpts.CPlusPlus && D.getDeclSpec().isTypeSpecOwned()) { 2101 // C++ [dcl.fct]p6: 2102 // Types shall not be defined in return or parameter types. 2103 TagDecl *Tag = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 2104 if (Tag->isDefinition()) 2105 S.Diag(Tag->getLocation(), diag::err_type_defined_in_result_type) 2106 << Context.getTypeDeclType(Tag); 2107 } 2108 2109 // Exception specs are not allowed in typedefs. Complain, but add it 2110 // anyway. 2111 if (IsTypedefName && FTI.getExceptionSpecType()) 2112 S.Diag(FTI.getExceptionSpecLoc(), diag::err_exception_spec_in_typedef) 2113 << (D.getContext() == Declarator::AliasDeclContext || 2114 D.getContext() == Declarator::AliasTemplateContext); 2115 2116 if (!FTI.NumArgs && !FTI.isVariadic && !LangOpts.CPlusPlus) { 2117 // Simple void foo(), where the incoming T is the result type. 2118 T = Context.getFunctionNoProtoType(T); 2119 } else { 2120 // We allow a zero-parameter variadic function in C if the 2121 // function is marked with the "overloadable" attribute. Scan 2122 // for this attribute now. 2123 if (!FTI.NumArgs && FTI.isVariadic && !LangOpts.CPlusPlus) { 2124 bool Overloadable = false; 2125 for (const AttributeList *Attrs = D.getAttributes(); 2126 Attrs; Attrs = Attrs->getNext()) { 2127 if (Attrs->getKind() == AttributeList::AT_overloadable) { 2128 Overloadable = true; 2129 break; 2130 } 2131 } 2132 2133 if (!Overloadable) 2134 S.Diag(FTI.getEllipsisLoc(), diag::err_ellipsis_first_arg); 2135 } 2136 2137 if (FTI.NumArgs && FTI.ArgInfo[0].Param == 0) { 2138 // C99 6.7.5.3p3: Reject int(x,y,z) when it's not a function 2139 // definition. 2140 S.Diag(FTI.ArgInfo[0].IdentLoc, diag::err_ident_list_in_fn_declaration); 2141 D.setInvalidType(true); 2142 break; 2143 } 2144 2145 FunctionProtoType::ExtProtoInfo EPI; 2146 EPI.Variadic = FTI.isVariadic; 2147 EPI.TypeQuals = FTI.TypeQuals; 2148 EPI.RefQualifier = !FTI.hasRefQualifier()? RQ_None 2149 : FTI.RefQualifierIsLValueRef? RQ_LValue 2150 : RQ_RValue; 2151 2152 // Otherwise, we have a function with an argument list that is 2153 // potentially variadic. 2154 llvm::SmallVector<QualType, 16> ArgTys; 2155 ArgTys.reserve(FTI.NumArgs); 2156 2157 llvm::SmallVector<bool, 16> ConsumedArguments; 2158 ConsumedArguments.reserve(FTI.NumArgs); 2159 bool HasAnyConsumedArguments = false; 2160 2161 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 2162 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 2163 QualType ArgTy = Param->getType(); 2164 assert(!ArgTy.isNull() && "Couldn't parse type?"); 2165 2166 // Adjust the parameter type. 2167 assert((ArgTy == S.adjustParameterType(ArgTy)) && "Unadjusted type?"); 2168 2169 // Look for 'void'. void is allowed only as a single argument to a 2170 // function with no other parameters (C99 6.7.5.3p10). We record 2171 // int(void) as a FunctionProtoType with an empty argument list. 2172 if (ArgTy->isVoidType()) { 2173 // If this is something like 'float(int, void)', reject it. 'void' 2174 // is an incomplete type (C99 6.2.5p19) and function decls cannot 2175 // have arguments of incomplete type. 2176 if (FTI.NumArgs != 1 || FTI.isVariadic) { 2177 S.Diag(DeclType.Loc, diag::err_void_only_param); 2178 ArgTy = Context.IntTy; 2179 Param->setType(ArgTy); 2180 } else if (FTI.ArgInfo[i].Ident) { 2181 // Reject, but continue to parse 'int(void abc)'. 2182 S.Diag(FTI.ArgInfo[i].IdentLoc, 2183 diag::err_param_with_void_type); 2184 ArgTy = Context.IntTy; 2185 Param->setType(ArgTy); 2186 } else { 2187 // Reject, but continue to parse 'float(const void)'. 2188 if (ArgTy.hasQualifiers()) 2189 S.Diag(DeclType.Loc, diag::err_void_param_qualified); 2190 2191 // Do not add 'void' to the ArgTys list. 2192 break; 2193 } 2194 } else if (!FTI.hasPrototype) { 2195 if (ArgTy->isPromotableIntegerType()) { 2196 ArgTy = Context.getPromotedIntegerType(ArgTy); 2197 Param->setKNRPromoted(true); 2198 } else if (const BuiltinType* BTy = ArgTy->getAs<BuiltinType>()) { 2199 if (BTy->getKind() == BuiltinType::Float) { 2200 ArgTy = Context.DoubleTy; 2201 Param->setKNRPromoted(true); 2202 } 2203 } 2204 } 2205 2206 if (LangOpts.ObjCAutoRefCount) { 2207 bool Consumed = Param->hasAttr<NSConsumedAttr>(); 2208 ConsumedArguments.push_back(Consumed); 2209 HasAnyConsumedArguments |= Consumed; 2210 } 2211 2212 ArgTys.push_back(ArgTy); 2213 } 2214 2215 if (HasAnyConsumedArguments) 2216 EPI.ConsumedArguments = ConsumedArguments.data(); 2217 2218 llvm::SmallVector<QualType, 4> Exceptions; 2219 EPI.ExceptionSpecType = FTI.getExceptionSpecType(); 2220 if (FTI.getExceptionSpecType() == EST_Dynamic) { 2221 Exceptions.reserve(FTI.NumExceptions); 2222 for (unsigned ei = 0, ee = FTI.NumExceptions; ei != ee; ++ei) { 2223 // FIXME: Preserve type source info. 2224 QualType ET = S.GetTypeFromParser(FTI.Exceptions[ei].Ty); 2225 // Check that the type is valid for an exception spec, and 2226 // drop it if not. 2227 if (!S.CheckSpecifiedExceptionType(ET, FTI.Exceptions[ei].Range)) 2228 Exceptions.push_back(ET); 2229 } 2230 EPI.NumExceptions = Exceptions.size(); 2231 EPI.Exceptions = Exceptions.data(); 2232 } else if (FTI.getExceptionSpecType() == EST_ComputedNoexcept) { 2233 // If an error occurred, there's no expression here. 2234 if (Expr *NoexceptExpr = FTI.NoexceptExpr) { 2235 assert((NoexceptExpr->isTypeDependent() || 2236 NoexceptExpr->getType()->getCanonicalTypeUnqualified() == 2237 Context.BoolTy) && 2238 "Parser should have made sure that the expression is boolean"); 2239 SourceLocation ErrLoc; 2240 llvm::APSInt Dummy; 2241 if (!NoexceptExpr->isValueDependent() && 2242 !NoexceptExpr->isIntegerConstantExpr(Dummy, Context, &ErrLoc, 2243 /*evaluated*/false)) 2244 S.Diag(ErrLoc, diag::err_noexcept_needs_constant_expression) 2245 << NoexceptExpr->getSourceRange(); 2246 else 2247 EPI.NoexceptExpr = NoexceptExpr; 2248 } 2249 } else if (FTI.getExceptionSpecType() == EST_None && 2250 ImplicitlyNoexcept && chunkIndex == 0) { 2251 // Only the outermost chunk is marked noexcept, of course. 2252 EPI.ExceptionSpecType = EST_BasicNoexcept; 2253 } 2254 2255 T = Context.getFunctionType(T, ArgTys.data(), ArgTys.size(), EPI); 2256 } 2257 2258 break; 2259 } 2260 case DeclaratorChunk::MemberPointer: 2261 // The scope spec must refer to a class, or be dependent. 2262 CXXScopeSpec &SS = DeclType.Mem.Scope(); 2263 QualType ClsType; 2264 if (SS.isInvalid()) { 2265 // Avoid emitting extra errors if we already errored on the scope. 2266 D.setInvalidType(true); 2267 } else if (S.isDependentScopeSpecifier(SS) || 2268 dyn_cast_or_null<CXXRecordDecl>(S.computeDeclContext(SS))) { 2269 NestedNameSpecifier *NNS 2270 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 2271 NestedNameSpecifier *NNSPrefix = NNS->getPrefix(); 2272 switch (NNS->getKind()) { 2273 case NestedNameSpecifier::Identifier: 2274 ClsType = Context.getDependentNameType(ETK_None, NNSPrefix, 2275 NNS->getAsIdentifier()); 2276 break; 2277 2278 case NestedNameSpecifier::Namespace: 2279 case NestedNameSpecifier::NamespaceAlias: 2280 case NestedNameSpecifier::Global: 2281 llvm_unreachable("Nested-name-specifier must name a type"); 2282 break; 2283 2284 case NestedNameSpecifier::TypeSpec: 2285 case NestedNameSpecifier::TypeSpecWithTemplate: 2286 ClsType = QualType(NNS->getAsType(), 0); 2287 // Note: if the NNS has a prefix and ClsType is a nondependent 2288 // TemplateSpecializationType, then the NNS prefix is NOT included 2289 // in ClsType; hence we wrap ClsType into an ElaboratedType. 2290 // NOTE: in particular, no wrap occurs if ClsType already is an 2291 // Elaborated, DependentName, or DependentTemplateSpecialization. 2292 if (NNSPrefix && isa<TemplateSpecializationType>(NNS->getAsType())) 2293 ClsType = Context.getElaboratedType(ETK_None, NNSPrefix, ClsType); 2294 break; 2295 } 2296 } else { 2297 S.Diag(DeclType.Mem.Scope().getBeginLoc(), 2298 diag::err_illegal_decl_mempointer_in_nonclass) 2299 << (D.getIdentifier() ? D.getIdentifier()->getName() : "type name") 2300 << DeclType.Mem.Scope().getRange(); 2301 D.setInvalidType(true); 2302 } 2303 2304 if (!ClsType.isNull()) 2305 T = S.BuildMemberPointerType(T, ClsType, DeclType.Loc, D.getIdentifier()); 2306 if (T.isNull()) { 2307 T = Context.IntTy; 2308 D.setInvalidType(true); 2309 } else if (DeclType.Mem.TypeQuals) { 2310 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Mem.TypeQuals); 2311 } 2312 break; 2313 } 2314 2315 if (T.isNull()) { 2316 D.setInvalidType(true); 2317 T = Context.IntTy; 2318 } 2319 2320 // See if there are any attributes on this declarator chunk. 2321 if (AttributeList *attrs = const_cast<AttributeList*>(DeclType.getAttrs())) 2322 processTypeAttrs(state, T, false, attrs); 2323 } 2324 2325 if (LangOpts.CPlusPlus && T->isFunctionType()) { 2326 const FunctionProtoType *FnTy = T->getAs<FunctionProtoType>(); 2327 assert(FnTy && "Why oh why is there not a FunctionProtoType here?"); 2328 2329 // C++ 8.3.5p4: 2330 // A cv-qualifier-seq shall only be part of the function type 2331 // for a nonstatic member function, the function type to which a pointer 2332 // to member refers, or the top-level function type of a function typedef 2333 // declaration. 2334 // 2335 // Core issue 547 also allows cv-qualifiers on function types that are 2336 // top-level template type arguments. 2337 bool FreeFunction; 2338 if (!D.getCXXScopeSpec().isSet()) { 2339 FreeFunction = (D.getContext() != Declarator::MemberContext || 2340 D.getDeclSpec().isFriendSpecified()); 2341 } else { 2342 DeclContext *DC = S.computeDeclContext(D.getCXXScopeSpec()); 2343 FreeFunction = (DC && !DC->isRecord()); 2344 } 2345 2346 // C++0x [dcl.fct]p6: 2347 // A ref-qualifier shall only be part of the function type for a 2348 // non-static member function, the function type to which a pointer to 2349 // member refers, or the top-level function type of a function typedef 2350 // declaration. 2351 if ((FnTy->getTypeQuals() != 0 || FnTy->getRefQualifier()) && 2352 !(D.getContext() == Declarator::TemplateTypeArgContext && 2353 !D.isFunctionDeclarator()) && !IsTypedefName && 2354 (FreeFunction || 2355 D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_static)) { 2356 if (D.getContext() == Declarator::TemplateTypeArgContext) { 2357 // Accept qualified function types as template type arguments as a GNU 2358 // extension. This is also the subject of C++ core issue 547. 2359 std::string Quals; 2360 if (FnTy->getTypeQuals() != 0) 2361 Quals = Qualifiers::fromCVRMask(FnTy->getTypeQuals()).getAsString(); 2362 2363 switch (FnTy->getRefQualifier()) { 2364 case RQ_None: 2365 break; 2366 2367 case RQ_LValue: 2368 if (!Quals.empty()) 2369 Quals += ' '; 2370 Quals += '&'; 2371 break; 2372 2373 case RQ_RValue: 2374 if (!Quals.empty()) 2375 Quals += ' '; 2376 Quals += "&&"; 2377 break; 2378 } 2379 2380 S.Diag(D.getIdentifierLoc(), 2381 diag::ext_qualified_function_type_template_arg) 2382 << Quals; 2383 } else { 2384 if (FnTy->getTypeQuals() != 0) { 2385 if (D.isFunctionDeclarator()) 2386 S.Diag(D.getIdentifierLoc(), 2387 diag::err_invalid_qualified_function_type); 2388 else 2389 S.Diag(D.getIdentifierLoc(), 2390 diag::err_invalid_qualified_typedef_function_type_use) 2391 << FreeFunction; 2392 } 2393 2394 if (FnTy->getRefQualifier()) { 2395 if (D.isFunctionDeclarator()) { 2396 SourceLocation Loc = D.getIdentifierLoc(); 2397 for (unsigned I = 0, N = D.getNumTypeObjects(); I != N; ++I) { 2398 const DeclaratorChunk &Chunk = D.getTypeObject(N-I-1); 2399 if (Chunk.Kind == DeclaratorChunk::Function && 2400 Chunk.Fun.hasRefQualifier()) { 2401 Loc = Chunk.Fun.getRefQualifierLoc(); 2402 break; 2403 } 2404 } 2405 2406 S.Diag(Loc, diag::err_invalid_ref_qualifier_function_type) 2407 << (FnTy->getRefQualifier() == RQ_LValue) 2408 << FixItHint::CreateRemoval(Loc); 2409 } else { 2410 S.Diag(D.getIdentifierLoc(), 2411 diag::err_invalid_ref_qualifier_typedef_function_type_use) 2412 << FreeFunction 2413 << (FnTy->getRefQualifier() == RQ_LValue); 2414 } 2415 } 2416 2417 // Strip the cv-qualifiers and ref-qualifiers from the type. 2418 FunctionProtoType::ExtProtoInfo EPI = FnTy->getExtProtoInfo(); 2419 EPI.TypeQuals = 0; 2420 EPI.RefQualifier = RQ_None; 2421 2422 T = Context.getFunctionType(FnTy->getResultType(), 2423 FnTy->arg_type_begin(), 2424 FnTy->getNumArgs(), EPI); 2425 } 2426 } 2427 } 2428 2429 // Apply any undistributed attributes from the declarator. 2430 if (!T.isNull()) 2431 if (AttributeList *attrs = D.getAttributes()) 2432 processTypeAttrs(state, T, false, attrs); 2433 2434 // Diagnose any ignored type attributes. 2435 if (!T.isNull()) state.diagnoseIgnoredTypeAttrs(T); 2436 2437 // C++0x [dcl.constexpr]p9: 2438 // A constexpr specifier used in an object declaration declares the object 2439 // as const. 2440 if (D.getDeclSpec().isConstexprSpecified() && T->isObjectType()) { 2441 T.addConst(); 2442 } 2443 2444 // If there was an ellipsis in the declarator, the declaration declares a 2445 // parameter pack whose type may be a pack expansion type. 2446 if (D.hasEllipsis() && !T.isNull()) { 2447 // C++0x [dcl.fct]p13: 2448 // A declarator-id or abstract-declarator containing an ellipsis shall 2449 // only be used in a parameter-declaration. Such a parameter-declaration 2450 // is a parameter pack (14.5.3). [...] 2451 switch (D.getContext()) { 2452 case Declarator::PrototypeContext: 2453 // C++0x [dcl.fct]p13: 2454 // [...] When it is part of a parameter-declaration-clause, the 2455 // parameter pack is a function parameter pack (14.5.3). The type T 2456 // of the declarator-id of the function parameter pack shall contain 2457 // a template parameter pack; each template parameter pack in T is 2458 // expanded by the function parameter pack. 2459 // 2460 // We represent function parameter packs as function parameters whose 2461 // type is a pack expansion. 2462 if (!T->containsUnexpandedParameterPack()) { 2463 S.Diag(D.getEllipsisLoc(), 2464 diag::err_function_parameter_pack_without_parameter_packs) 2465 << T << D.getSourceRange(); 2466 D.setEllipsisLoc(SourceLocation()); 2467 } else { 2468 T = Context.getPackExpansionType(T, llvm::Optional<unsigned>()); 2469 } 2470 break; 2471 2472 case Declarator::TemplateParamContext: 2473 // C++0x [temp.param]p15: 2474 // If a template-parameter is a [...] is a parameter-declaration that 2475 // declares a parameter pack (8.3.5), then the template-parameter is a 2476 // template parameter pack (14.5.3). 2477 // 2478 // Note: core issue 778 clarifies that, if there are any unexpanded 2479 // parameter packs in the type of the non-type template parameter, then 2480 // it expands those parameter packs. 2481 if (T->containsUnexpandedParameterPack()) 2482 T = Context.getPackExpansionType(T, llvm::Optional<unsigned>()); 2483 else if (!LangOpts.CPlusPlus0x) 2484 S.Diag(D.getEllipsisLoc(), diag::ext_variadic_templates); 2485 break; 2486 2487 case Declarator::FileContext: 2488 case Declarator::KNRTypeListContext: 2489 case Declarator::ObjCPrototypeContext: // FIXME: special diagnostic here? 2490 case Declarator::TypeNameContext: 2491 case Declarator::CXXNewContext: 2492 case Declarator::AliasDeclContext: 2493 case Declarator::AliasTemplateContext: 2494 case Declarator::MemberContext: 2495 case Declarator::BlockContext: 2496 case Declarator::ForContext: 2497 case Declarator::ConditionContext: 2498 case Declarator::CXXCatchContext: 2499 case Declarator::ObjCCatchContext: 2500 case Declarator::BlockLiteralContext: 2501 case Declarator::TemplateTypeArgContext: 2502 // FIXME: We may want to allow parameter packs in block-literal contexts 2503 // in the future. 2504 S.Diag(D.getEllipsisLoc(), diag::err_ellipsis_in_declarator_not_parameter); 2505 D.setEllipsisLoc(SourceLocation()); 2506 break; 2507 } 2508 } 2509 2510 if (T.isNull()) 2511 return Context.getNullTypeSourceInfo(); 2512 else if (D.isInvalidType()) 2513 return Context.getTrivialTypeSourceInfo(T); 2514 2515 return S.GetTypeSourceInfoForDeclarator(D, T, TInfo); 2516} 2517 2518/// GetTypeForDeclarator - Convert the type for the specified 2519/// declarator to Type instances. 2520/// 2521/// The result of this call will never be null, but the associated 2522/// type may be a null type if there's an unrecoverable error. 2523TypeSourceInfo *Sema::GetTypeForDeclarator(Declarator &D, Scope *S) { 2524 // Determine the type of the declarator. Not all forms of declarator 2525 // have a type. 2526 2527 TypeProcessingState state(*this, D); 2528 2529 TypeSourceInfo *ReturnTypeInfo = 0; 2530 QualType T = GetDeclSpecTypeForDeclarator(state, ReturnTypeInfo); 2531 if (T.isNull()) 2532 return Context.getNullTypeSourceInfo(); 2533 2534 if (D.isPrototypeContext() && getLangOptions().ObjCAutoRefCount) 2535 inferARCWriteback(state, T); 2536 2537 return GetFullTypeForDeclarator(state, T, ReturnTypeInfo); 2538} 2539 2540static void transferARCOwnershipToDeclSpec(Sema &S, 2541 QualType &declSpecTy, 2542 Qualifiers::ObjCLifetime ownership) { 2543 if (declSpecTy->isObjCRetainableType() && 2544 declSpecTy.getObjCLifetime() == Qualifiers::OCL_None) { 2545 Qualifiers qs; 2546 qs.addObjCLifetime(ownership); 2547 declSpecTy = S.Context.getQualifiedType(declSpecTy, qs); 2548 } 2549 return; 2550} 2551 2552static void transferARCOwnershipToDeclaratorChunk(TypeProcessingState &state, 2553 Qualifiers::ObjCLifetime ownership, 2554 unsigned chunkIndex) { 2555 Sema &S = state.getSema(); 2556 Declarator &D = state.getDeclarator(); 2557 2558 // Look for an explicit lifetime attribute. 2559 DeclaratorChunk &chunk = D.getTypeObject(chunkIndex); 2560 for (const AttributeList *attr = chunk.getAttrs(); attr; 2561 attr = attr->getNext()) 2562 if (attr->getKind() == AttributeList::AT_objc_ownership) 2563 return; 2564 2565 const char *attrStr = 0; 2566 switch (ownership) { 2567 case Qualifiers::OCL_None: llvm_unreachable("no ownership!"); break; 2568 case Qualifiers::OCL_ExplicitNone: attrStr = "none"; break; 2569 case Qualifiers::OCL_Strong: attrStr = "strong"; break; 2570 case Qualifiers::OCL_Weak: attrStr = "weak"; break; 2571 case Qualifiers::OCL_Autoreleasing: attrStr = "autoreleasing"; break; 2572 } 2573 if (!attrStr) 2574 return; 2575 2576 // If there wasn't one, add one (with an invalid source location 2577 // so that we don't make an AttributedType for it). 2578 AttributeList *attr = D.getAttributePool() 2579 .create(&S.Context.Idents.get("objc_ownership"), SourceLocation(), 2580 /*scope*/ 0, SourceLocation(), 2581 &S.Context.Idents.get(attrStr), SourceLocation(), 2582 /*args*/ 0, 0, 2583 /*declspec*/ false, /*C++0x*/ false); 2584 spliceAttrIntoList(*attr, chunk.getAttrListRef()); 2585 2586 // TODO: mark whether we did this inference? 2587} 2588 2589static void transferARCOwnership(TypeProcessingState &state, 2590 QualType &declSpecTy, 2591 Qualifiers::ObjCLifetime ownership) { 2592 Sema &S = state.getSema(); 2593 Declarator &D = state.getDeclarator(); 2594 2595 int inner = -1; 2596 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 2597 DeclaratorChunk &chunk = D.getTypeObject(i); 2598 switch (chunk.Kind) { 2599 case DeclaratorChunk::Paren: 2600 // Ignore parens. 2601 break; 2602 2603 case DeclaratorChunk::Array: 2604 case DeclaratorChunk::Reference: 2605 case DeclaratorChunk::Pointer: 2606 inner = i; 2607 break; 2608 2609 case DeclaratorChunk::BlockPointer: 2610 return transferARCOwnershipToDeclaratorChunk(state, ownership, i); 2611 2612 case DeclaratorChunk::Function: 2613 case DeclaratorChunk::MemberPointer: 2614 return; 2615 } 2616 } 2617 2618 if (inner == -1) 2619 return transferARCOwnershipToDeclSpec(S, declSpecTy, ownership); 2620 2621 DeclaratorChunk &chunk = D.getTypeObject(inner); 2622 if (chunk.Kind == DeclaratorChunk::Pointer) { 2623 if (declSpecTy->isObjCRetainableType()) 2624 return transferARCOwnershipToDeclSpec(S, declSpecTy, ownership); 2625 if (declSpecTy->isObjCObjectType()) 2626 return transferARCOwnershipToDeclaratorChunk(state, ownership, inner); 2627 } else { 2628 assert(chunk.Kind == DeclaratorChunk::Array || 2629 chunk.Kind == DeclaratorChunk::Reference); 2630 return transferARCOwnershipToDeclSpec(S, declSpecTy, ownership); 2631 } 2632} 2633 2634TypeSourceInfo *Sema::GetTypeForDeclaratorCast(Declarator &D, QualType FromTy) { 2635 TypeProcessingState state(*this, D); 2636 2637 TypeSourceInfo *ReturnTypeInfo = 0; 2638 QualType declSpecTy = GetDeclSpecTypeForDeclarator(state, ReturnTypeInfo); 2639 if (declSpecTy.isNull()) 2640 return Context.getNullTypeSourceInfo(); 2641 2642 if (getLangOptions().ObjCAutoRefCount) { 2643 Qualifiers::ObjCLifetime ownership = Context.getInnerObjCOwnership(FromTy); 2644 if (ownership != Qualifiers::OCL_None) 2645 transferARCOwnership(state, declSpecTy, ownership); 2646 } 2647 2648 return GetFullTypeForDeclarator(state, declSpecTy, ReturnTypeInfo); 2649} 2650 2651/// Map an AttributedType::Kind to an AttributeList::Kind. 2652static AttributeList::Kind getAttrListKind(AttributedType::Kind kind) { 2653 switch (kind) { 2654 case AttributedType::attr_address_space: 2655 return AttributeList::AT_address_space; 2656 case AttributedType::attr_regparm: 2657 return AttributeList::AT_regparm; 2658 case AttributedType::attr_vector_size: 2659 return AttributeList::AT_vector_size; 2660 case AttributedType::attr_neon_vector_type: 2661 return AttributeList::AT_neon_vector_type; 2662 case AttributedType::attr_neon_polyvector_type: 2663 return AttributeList::AT_neon_polyvector_type; 2664 case AttributedType::attr_objc_gc: 2665 return AttributeList::AT_objc_gc; 2666 case AttributedType::attr_objc_ownership: 2667 return AttributeList::AT_objc_ownership; 2668 case AttributedType::attr_noreturn: 2669 return AttributeList::AT_noreturn; 2670 case AttributedType::attr_cdecl: 2671 return AttributeList::AT_cdecl; 2672 case AttributedType::attr_fastcall: 2673 return AttributeList::AT_fastcall; 2674 case AttributedType::attr_stdcall: 2675 return AttributeList::AT_stdcall; 2676 case AttributedType::attr_thiscall: 2677 return AttributeList::AT_thiscall; 2678 case AttributedType::attr_pascal: 2679 return AttributeList::AT_pascal; 2680 case AttributedType::attr_pcs: 2681 return AttributeList::AT_pcs; 2682 } 2683 llvm_unreachable("unexpected attribute kind!"); 2684 return AttributeList::Kind(); 2685} 2686 2687static void fillAttributedTypeLoc(AttributedTypeLoc TL, 2688 const AttributeList *attrs) { 2689 AttributedType::Kind kind = TL.getAttrKind(); 2690 2691 assert(attrs && "no type attributes in the expected location!"); 2692 AttributeList::Kind parsedKind = getAttrListKind(kind); 2693 while (attrs->getKind() != parsedKind) { 2694 attrs = attrs->getNext(); 2695 assert(attrs && "no matching attribute in expected location!"); 2696 } 2697 2698 TL.setAttrNameLoc(attrs->getLoc()); 2699 if (TL.hasAttrExprOperand()) 2700 TL.setAttrExprOperand(attrs->getArg(0)); 2701 else if (TL.hasAttrEnumOperand()) 2702 TL.setAttrEnumOperandLoc(attrs->getParameterLoc()); 2703 2704 // FIXME: preserve this information to here. 2705 if (TL.hasAttrOperand()) 2706 TL.setAttrOperandParensRange(SourceRange()); 2707} 2708 2709namespace { 2710 class TypeSpecLocFiller : public TypeLocVisitor<TypeSpecLocFiller> { 2711 ASTContext &Context; 2712 const DeclSpec &DS; 2713 2714 public: 2715 TypeSpecLocFiller(ASTContext &Context, const DeclSpec &DS) 2716 : Context(Context), DS(DS) {} 2717 2718 void VisitAttributedTypeLoc(AttributedTypeLoc TL) { 2719 fillAttributedTypeLoc(TL, DS.getAttributes().getList()); 2720 Visit(TL.getModifiedLoc()); 2721 } 2722 void VisitQualifiedTypeLoc(QualifiedTypeLoc TL) { 2723 Visit(TL.getUnqualifiedLoc()); 2724 } 2725 void VisitTypedefTypeLoc(TypedefTypeLoc TL) { 2726 TL.setNameLoc(DS.getTypeSpecTypeLoc()); 2727 } 2728 void VisitObjCInterfaceTypeLoc(ObjCInterfaceTypeLoc TL) { 2729 TL.setNameLoc(DS.getTypeSpecTypeLoc()); 2730 } 2731 void VisitObjCObjectTypeLoc(ObjCObjectTypeLoc TL) { 2732 // Handle the base type, which might not have been written explicitly. 2733 if (DS.getTypeSpecType() == DeclSpec::TST_unspecified) { 2734 TL.setHasBaseTypeAsWritten(false); 2735 TL.getBaseLoc().initialize(Context, SourceLocation()); 2736 } else { 2737 TL.setHasBaseTypeAsWritten(true); 2738 Visit(TL.getBaseLoc()); 2739 } 2740 2741 // Protocol qualifiers. 2742 if (DS.getProtocolQualifiers()) { 2743 assert(TL.getNumProtocols() > 0); 2744 assert(TL.getNumProtocols() == DS.getNumProtocolQualifiers()); 2745 TL.setLAngleLoc(DS.getProtocolLAngleLoc()); 2746 TL.setRAngleLoc(DS.getSourceRange().getEnd()); 2747 for (unsigned i = 0, e = DS.getNumProtocolQualifiers(); i != e; ++i) 2748 TL.setProtocolLoc(i, DS.getProtocolLocs()[i]); 2749 } else { 2750 assert(TL.getNumProtocols() == 0); 2751 TL.setLAngleLoc(SourceLocation()); 2752 TL.setRAngleLoc(SourceLocation()); 2753 } 2754 } 2755 void VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL) { 2756 TL.setStarLoc(SourceLocation()); 2757 Visit(TL.getPointeeLoc()); 2758 } 2759 void VisitTemplateSpecializationTypeLoc(TemplateSpecializationTypeLoc TL) { 2760 TypeSourceInfo *TInfo = 0; 2761 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 2762 2763 // If we got no declarator info from previous Sema routines, 2764 // just fill with the typespec loc. 2765 if (!TInfo) { 2766 TL.initialize(Context, DS.getTypeSpecTypeNameLoc()); 2767 return; 2768 } 2769 2770 TypeLoc OldTL = TInfo->getTypeLoc(); 2771 if (TInfo->getType()->getAs<ElaboratedType>()) { 2772 ElaboratedTypeLoc ElabTL = cast<ElaboratedTypeLoc>(OldTL); 2773 TemplateSpecializationTypeLoc NamedTL = 2774 cast<TemplateSpecializationTypeLoc>(ElabTL.getNamedTypeLoc()); 2775 TL.copy(NamedTL); 2776 } 2777 else 2778 TL.copy(cast<TemplateSpecializationTypeLoc>(OldTL)); 2779 } 2780 void VisitTypeOfExprTypeLoc(TypeOfExprTypeLoc TL) { 2781 assert(DS.getTypeSpecType() == DeclSpec::TST_typeofExpr); 2782 TL.setTypeofLoc(DS.getTypeSpecTypeLoc()); 2783 TL.setParensRange(DS.getTypeofParensRange()); 2784 } 2785 void VisitTypeOfTypeLoc(TypeOfTypeLoc TL) { 2786 assert(DS.getTypeSpecType() == DeclSpec::TST_typeofType); 2787 TL.setTypeofLoc(DS.getTypeSpecTypeLoc()); 2788 TL.setParensRange(DS.getTypeofParensRange()); 2789 assert(DS.getRepAsType()); 2790 TypeSourceInfo *TInfo = 0; 2791 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 2792 TL.setUnderlyingTInfo(TInfo); 2793 } 2794 void VisitUnaryTransformTypeLoc(UnaryTransformTypeLoc TL) { 2795 // FIXME: This holds only because we only have one unary transform. 2796 assert(DS.getTypeSpecType() == DeclSpec::TST_underlyingType); 2797 TL.setKWLoc(DS.getTypeSpecTypeLoc()); 2798 TL.setParensRange(DS.getTypeofParensRange()); 2799 assert(DS.getRepAsType()); 2800 TypeSourceInfo *TInfo = 0; 2801 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 2802 TL.setUnderlyingTInfo(TInfo); 2803 } 2804 void VisitBuiltinTypeLoc(BuiltinTypeLoc TL) { 2805 // By default, use the source location of the type specifier. 2806 TL.setBuiltinLoc(DS.getTypeSpecTypeLoc()); 2807 if (TL.needsExtraLocalData()) { 2808 // Set info for the written builtin specifiers. 2809 TL.getWrittenBuiltinSpecs() = DS.getWrittenBuiltinSpecs(); 2810 // Try to have a meaningful source location. 2811 if (TL.getWrittenSignSpec() != TSS_unspecified) 2812 // Sign spec loc overrides the others (e.g., 'unsigned long'). 2813 TL.setBuiltinLoc(DS.getTypeSpecSignLoc()); 2814 else if (TL.getWrittenWidthSpec() != TSW_unspecified) 2815 // Width spec loc overrides type spec loc (e.g., 'short int'). 2816 TL.setBuiltinLoc(DS.getTypeSpecWidthLoc()); 2817 } 2818 } 2819 void VisitElaboratedTypeLoc(ElaboratedTypeLoc TL) { 2820 ElaboratedTypeKeyword Keyword 2821 = TypeWithKeyword::getKeywordForTypeSpec(DS.getTypeSpecType()); 2822 if (DS.getTypeSpecType() == TST_typename) { 2823 TypeSourceInfo *TInfo = 0; 2824 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 2825 if (TInfo) { 2826 TL.copy(cast<ElaboratedTypeLoc>(TInfo->getTypeLoc())); 2827 return; 2828 } 2829 } 2830 TL.setKeywordLoc(Keyword != ETK_None 2831 ? DS.getTypeSpecTypeLoc() 2832 : SourceLocation()); 2833 const CXXScopeSpec& SS = DS.getTypeSpecScope(); 2834 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 2835 Visit(TL.getNextTypeLoc().getUnqualifiedLoc()); 2836 } 2837 void VisitDependentNameTypeLoc(DependentNameTypeLoc TL) { 2838 ElaboratedTypeKeyword Keyword 2839 = TypeWithKeyword::getKeywordForTypeSpec(DS.getTypeSpecType()); 2840 if (DS.getTypeSpecType() == TST_typename) { 2841 TypeSourceInfo *TInfo = 0; 2842 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 2843 if (TInfo) { 2844 TL.copy(cast<DependentNameTypeLoc>(TInfo->getTypeLoc())); 2845 return; 2846 } 2847 } 2848 TL.setKeywordLoc(Keyword != ETK_None 2849 ? DS.getTypeSpecTypeLoc() 2850 : SourceLocation()); 2851 const CXXScopeSpec& SS = DS.getTypeSpecScope(); 2852 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 2853 TL.setNameLoc(DS.getTypeSpecTypeNameLoc()); 2854 } 2855 void VisitDependentTemplateSpecializationTypeLoc( 2856 DependentTemplateSpecializationTypeLoc TL) { 2857 ElaboratedTypeKeyword Keyword 2858 = TypeWithKeyword::getKeywordForTypeSpec(DS.getTypeSpecType()); 2859 if (Keyword == ETK_Typename) { 2860 TypeSourceInfo *TInfo = 0; 2861 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 2862 if (TInfo) { 2863 TL.copy(cast<DependentTemplateSpecializationTypeLoc>( 2864 TInfo->getTypeLoc())); 2865 return; 2866 } 2867 } 2868 TL.initializeLocal(Context, SourceLocation()); 2869 TL.setKeywordLoc(Keyword != ETK_None 2870 ? DS.getTypeSpecTypeLoc() 2871 : SourceLocation()); 2872 const CXXScopeSpec& SS = DS.getTypeSpecScope(); 2873 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 2874 TL.setNameLoc(DS.getTypeSpecTypeNameLoc()); 2875 } 2876 void VisitTagTypeLoc(TagTypeLoc TL) { 2877 TL.setNameLoc(DS.getTypeSpecTypeNameLoc()); 2878 } 2879 2880 void VisitTypeLoc(TypeLoc TL) { 2881 // FIXME: add other typespec types and change this to an assert. 2882 TL.initialize(Context, DS.getTypeSpecTypeLoc()); 2883 } 2884 }; 2885 2886 class DeclaratorLocFiller : public TypeLocVisitor<DeclaratorLocFiller> { 2887 ASTContext &Context; 2888 const DeclaratorChunk &Chunk; 2889 2890 public: 2891 DeclaratorLocFiller(ASTContext &Context, const DeclaratorChunk &Chunk) 2892 : Context(Context), Chunk(Chunk) {} 2893 2894 void VisitQualifiedTypeLoc(QualifiedTypeLoc TL) { 2895 llvm_unreachable("qualified type locs not expected here!"); 2896 } 2897 2898 void VisitAttributedTypeLoc(AttributedTypeLoc TL) { 2899 fillAttributedTypeLoc(TL, Chunk.getAttrs()); 2900 } 2901 void VisitBlockPointerTypeLoc(BlockPointerTypeLoc TL) { 2902 assert(Chunk.Kind == DeclaratorChunk::BlockPointer); 2903 TL.setCaretLoc(Chunk.Loc); 2904 } 2905 void VisitPointerTypeLoc(PointerTypeLoc TL) { 2906 assert(Chunk.Kind == DeclaratorChunk::Pointer); 2907 TL.setStarLoc(Chunk.Loc); 2908 } 2909 void VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL) { 2910 assert(Chunk.Kind == DeclaratorChunk::Pointer); 2911 TL.setStarLoc(Chunk.Loc); 2912 } 2913 void VisitMemberPointerTypeLoc(MemberPointerTypeLoc TL) { 2914 assert(Chunk.Kind == DeclaratorChunk::MemberPointer); 2915 const CXXScopeSpec& SS = Chunk.Mem.Scope(); 2916 NestedNameSpecifierLoc NNSLoc = SS.getWithLocInContext(Context); 2917 2918 const Type* ClsTy = TL.getClass(); 2919 QualType ClsQT = QualType(ClsTy, 0); 2920 TypeSourceInfo *ClsTInfo = Context.CreateTypeSourceInfo(ClsQT, 0); 2921 // Now copy source location info into the type loc component. 2922 TypeLoc ClsTL = ClsTInfo->getTypeLoc(); 2923 switch (NNSLoc.getNestedNameSpecifier()->getKind()) { 2924 case NestedNameSpecifier::Identifier: 2925 assert(isa<DependentNameType>(ClsTy) && "Unexpected TypeLoc"); 2926 { 2927 DependentNameTypeLoc DNTLoc = cast<DependentNameTypeLoc>(ClsTL); 2928 DNTLoc.setKeywordLoc(SourceLocation()); 2929 DNTLoc.setQualifierLoc(NNSLoc.getPrefix()); 2930 DNTLoc.setNameLoc(NNSLoc.getLocalBeginLoc()); 2931 } 2932 break; 2933 2934 case NestedNameSpecifier::TypeSpec: 2935 case NestedNameSpecifier::TypeSpecWithTemplate: 2936 if (isa<ElaboratedType>(ClsTy)) { 2937 ElaboratedTypeLoc ETLoc = *cast<ElaboratedTypeLoc>(&ClsTL); 2938 ETLoc.setKeywordLoc(SourceLocation()); 2939 ETLoc.setQualifierLoc(NNSLoc.getPrefix()); 2940 TypeLoc NamedTL = ETLoc.getNamedTypeLoc(); 2941 NamedTL.initializeFullCopy(NNSLoc.getTypeLoc()); 2942 } else { 2943 ClsTL.initializeFullCopy(NNSLoc.getTypeLoc()); 2944 } 2945 break; 2946 2947 case NestedNameSpecifier::Namespace: 2948 case NestedNameSpecifier::NamespaceAlias: 2949 case NestedNameSpecifier::Global: 2950 llvm_unreachable("Nested-name-specifier must name a type"); 2951 break; 2952 } 2953 2954 // Finally fill in MemberPointerLocInfo fields. 2955 TL.setStarLoc(Chunk.Loc); 2956 TL.setClassTInfo(ClsTInfo); 2957 } 2958 void VisitLValueReferenceTypeLoc(LValueReferenceTypeLoc TL) { 2959 assert(Chunk.Kind == DeclaratorChunk::Reference); 2960 // 'Amp' is misleading: this might have been originally 2961 /// spelled with AmpAmp. 2962 TL.setAmpLoc(Chunk.Loc); 2963 } 2964 void VisitRValueReferenceTypeLoc(RValueReferenceTypeLoc TL) { 2965 assert(Chunk.Kind == DeclaratorChunk::Reference); 2966 assert(!Chunk.Ref.LValueRef); 2967 TL.setAmpAmpLoc(Chunk.Loc); 2968 } 2969 void VisitArrayTypeLoc(ArrayTypeLoc TL) { 2970 assert(Chunk.Kind == DeclaratorChunk::Array); 2971 TL.setLBracketLoc(Chunk.Loc); 2972 TL.setRBracketLoc(Chunk.EndLoc); 2973 TL.setSizeExpr(static_cast<Expr*>(Chunk.Arr.NumElts)); 2974 } 2975 void VisitFunctionTypeLoc(FunctionTypeLoc TL) { 2976 assert(Chunk.Kind == DeclaratorChunk::Function); 2977 TL.setLocalRangeBegin(Chunk.Loc); 2978 TL.setLocalRangeEnd(Chunk.EndLoc); 2979 TL.setTrailingReturn(!!Chunk.Fun.TrailingReturnType); 2980 2981 const DeclaratorChunk::FunctionTypeInfo &FTI = Chunk.Fun; 2982 for (unsigned i = 0, e = TL.getNumArgs(), tpi = 0; i != e; ++i) { 2983 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 2984 TL.setArg(tpi++, Param); 2985 } 2986 // FIXME: exception specs 2987 } 2988 void VisitParenTypeLoc(ParenTypeLoc TL) { 2989 assert(Chunk.Kind == DeclaratorChunk::Paren); 2990 TL.setLParenLoc(Chunk.Loc); 2991 TL.setRParenLoc(Chunk.EndLoc); 2992 } 2993 2994 void VisitTypeLoc(TypeLoc TL) { 2995 llvm_unreachable("unsupported TypeLoc kind in declarator!"); 2996 } 2997 }; 2998} 2999 3000/// \brief Create and instantiate a TypeSourceInfo with type source information. 3001/// 3002/// \param T QualType referring to the type as written in source code. 3003/// 3004/// \param ReturnTypeInfo For declarators whose return type does not show 3005/// up in the normal place in the declaration specifiers (such as a C++ 3006/// conversion function), this pointer will refer to a type source information 3007/// for that return type. 3008TypeSourceInfo * 3009Sema::GetTypeSourceInfoForDeclarator(Declarator &D, QualType T, 3010 TypeSourceInfo *ReturnTypeInfo) { 3011 TypeSourceInfo *TInfo = Context.CreateTypeSourceInfo(T); 3012 UnqualTypeLoc CurrTL = TInfo->getTypeLoc().getUnqualifiedLoc(); 3013 3014 // Handle parameter packs whose type is a pack expansion. 3015 if (isa<PackExpansionType>(T)) { 3016 cast<PackExpansionTypeLoc>(CurrTL).setEllipsisLoc(D.getEllipsisLoc()); 3017 CurrTL = CurrTL.getNextTypeLoc().getUnqualifiedLoc(); 3018 } 3019 3020 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 3021 while (isa<AttributedTypeLoc>(CurrTL)) { 3022 AttributedTypeLoc TL = cast<AttributedTypeLoc>(CurrTL); 3023 fillAttributedTypeLoc(TL, D.getTypeObject(i).getAttrs()); 3024 CurrTL = TL.getNextTypeLoc().getUnqualifiedLoc(); 3025 } 3026 3027 DeclaratorLocFiller(Context, D.getTypeObject(i)).Visit(CurrTL); 3028 CurrTL = CurrTL.getNextTypeLoc().getUnqualifiedLoc(); 3029 } 3030 3031 // If we have different source information for the return type, use 3032 // that. This really only applies to C++ conversion functions. 3033 if (ReturnTypeInfo) { 3034 TypeLoc TL = ReturnTypeInfo->getTypeLoc(); 3035 assert(TL.getFullDataSize() == CurrTL.getFullDataSize()); 3036 memcpy(CurrTL.getOpaqueData(), TL.getOpaqueData(), TL.getFullDataSize()); 3037 } else { 3038 TypeSpecLocFiller(Context, D.getDeclSpec()).Visit(CurrTL); 3039 } 3040 3041 return TInfo; 3042} 3043 3044/// \brief Create a LocInfoType to hold the given QualType and TypeSourceInfo. 3045ParsedType Sema::CreateParsedType(QualType T, TypeSourceInfo *TInfo) { 3046 // FIXME: LocInfoTypes are "transient", only needed for passing to/from Parser 3047 // and Sema during declaration parsing. Try deallocating/caching them when 3048 // it's appropriate, instead of allocating them and keeping them around. 3049 LocInfoType *LocT = (LocInfoType*)BumpAlloc.Allocate(sizeof(LocInfoType), 3050 TypeAlignment); 3051 new (LocT) LocInfoType(T, TInfo); 3052 assert(LocT->getTypeClass() != T->getTypeClass() && 3053 "LocInfoType's TypeClass conflicts with an existing Type class"); 3054 return ParsedType::make(QualType(LocT, 0)); 3055} 3056 3057void LocInfoType::getAsStringInternal(std::string &Str, 3058 const PrintingPolicy &Policy) const { 3059 assert(false && "LocInfoType leaked into the type system; an opaque TypeTy*" 3060 " was used directly instead of getting the QualType through" 3061 " GetTypeFromParser"); 3062} 3063 3064TypeResult Sema::ActOnTypeName(Scope *S, Declarator &D) { 3065 // C99 6.7.6: Type names have no identifier. This is already validated by 3066 // the parser. 3067 assert(D.getIdentifier() == 0 && "Type name should have no identifier!"); 3068 3069 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 3070 QualType T = TInfo->getType(); 3071 if (D.isInvalidType()) 3072 return true; 3073 3074 if (getLangOptions().CPlusPlus) { 3075 // Check that there are no default arguments (C++ only). 3076 CheckExtraCXXDefaultArguments(D); 3077 } 3078 3079 return CreateParsedType(T, TInfo); 3080} 3081 3082//===----------------------------------------------------------------------===// 3083// Type Attribute Processing 3084//===----------------------------------------------------------------------===// 3085 3086/// HandleAddressSpaceTypeAttribute - Process an address_space attribute on the 3087/// specified type. The attribute contains 1 argument, the id of the address 3088/// space for the type. 3089static void HandleAddressSpaceTypeAttribute(QualType &Type, 3090 const AttributeList &Attr, Sema &S){ 3091 3092 // If this type is already address space qualified, reject it. 3093 // Clause 6.7.3 - Type qualifiers: "No type shall be qualified by qualifiers 3094 // for two or more different address spaces." 3095 if (Type.getAddressSpace()) { 3096 S.Diag(Attr.getLoc(), diag::err_attribute_address_multiple_qualifiers); 3097 Attr.setInvalid(); 3098 return; 3099 } 3100 3101 // Check the attribute arguments. 3102 if (Attr.getNumArgs() != 1) { 3103 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 3104 Attr.setInvalid(); 3105 return; 3106 } 3107 Expr *ASArgExpr = static_cast<Expr *>(Attr.getArg(0)); 3108 llvm::APSInt addrSpace(32); 3109 if (ASArgExpr->isTypeDependent() || ASArgExpr->isValueDependent() || 3110 !ASArgExpr->isIntegerConstantExpr(addrSpace, S.Context)) { 3111 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_not_int) 3112 << ASArgExpr->getSourceRange(); 3113 Attr.setInvalid(); 3114 return; 3115 } 3116 3117 // Bounds checking. 3118 if (addrSpace.isSigned()) { 3119 if (addrSpace.isNegative()) { 3120 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_negative) 3121 << ASArgExpr->getSourceRange(); 3122 Attr.setInvalid(); 3123 return; 3124 } 3125 addrSpace.setIsSigned(false); 3126 } 3127 llvm::APSInt max(addrSpace.getBitWidth()); 3128 max = Qualifiers::MaxAddressSpace; 3129 if (addrSpace > max) { 3130 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_too_high) 3131 << Qualifiers::MaxAddressSpace << ASArgExpr->getSourceRange(); 3132 Attr.setInvalid(); 3133 return; 3134 } 3135 3136 unsigned ASIdx = static_cast<unsigned>(addrSpace.getZExtValue()); 3137 Type = S.Context.getAddrSpaceQualType(Type, ASIdx); 3138} 3139 3140/// handleObjCOwnershipTypeAttr - Process an objc_ownership 3141/// attribute on the specified type. 3142/// 3143/// Returns 'true' if the attribute was handled. 3144static bool handleObjCOwnershipTypeAttr(TypeProcessingState &state, 3145 AttributeList &attr, 3146 QualType &type) { 3147 if (!type->isObjCRetainableType() && !type->isDependentType()) 3148 return false; 3149 3150 Sema &S = state.getSema(); 3151 3152 if (type.getQualifiers().getObjCLifetime()) { 3153 S.Diag(attr.getLoc(), diag::err_attr_objc_ownership_redundant) 3154 << type; 3155 return true; 3156 } 3157 3158 if (!attr.getParameterName()) { 3159 S.Diag(attr.getLoc(), diag::err_attribute_argument_n_not_string) 3160 << "objc_ownership" << 1; 3161 attr.setInvalid(); 3162 return true; 3163 } 3164 3165 Qualifiers::ObjCLifetime lifetime; 3166 if (attr.getParameterName()->isStr("none")) 3167 lifetime = Qualifiers::OCL_ExplicitNone; 3168 else if (attr.getParameterName()->isStr("strong")) 3169 lifetime = Qualifiers::OCL_Strong; 3170 else if (attr.getParameterName()->isStr("weak")) 3171 lifetime = Qualifiers::OCL_Weak; 3172 else if (attr.getParameterName()->isStr("autoreleasing")) 3173 lifetime = Qualifiers::OCL_Autoreleasing; 3174 else { 3175 S.Diag(attr.getLoc(), diag::warn_attribute_type_not_supported) 3176 << "objc_ownership" << attr.getParameterName(); 3177 attr.setInvalid(); 3178 return true; 3179 } 3180 3181 // Consume lifetime attributes without further comment outside of 3182 // ARC mode. 3183 if (!S.getLangOptions().ObjCAutoRefCount) 3184 return true; 3185 3186 Qualifiers qs; 3187 qs.setObjCLifetime(lifetime); 3188 QualType origType = type; 3189 type = S.Context.getQualifiedType(type, qs); 3190 3191 // If we have a valid source location for the attribute, use an 3192 // AttributedType instead. 3193 if (attr.getLoc().isValid()) 3194 type = S.Context.getAttributedType(AttributedType::attr_objc_ownership, 3195 origType, type); 3196 3197 // Forbid __weak if we don't have a runtime. 3198 if (lifetime == Qualifiers::OCL_Weak && 3199 S.getLangOptions().ObjCNoAutoRefCountRuntime) { 3200 3201 // Actually, delay this until we know what we're parsing. 3202 if (S.DelayedDiagnostics.shouldDelayDiagnostics()) { 3203 S.DelayedDiagnostics.add( 3204 sema::DelayedDiagnostic::makeForbiddenType(attr.getLoc(), 3205 diag::err_arc_weak_no_runtime, type, /*ignored*/ 0)); 3206 } else { 3207 S.Diag(attr.getLoc(), diag::err_arc_weak_no_runtime); 3208 } 3209 3210 attr.setInvalid(); 3211 return true; 3212 } 3213 3214 return true; 3215} 3216 3217/// handleObjCGCTypeAttr - Process the __attribute__((objc_gc)) type 3218/// attribute on the specified type. Returns true to indicate that 3219/// the attribute was handled, false to indicate that the type does 3220/// not permit the attribute. 3221static bool handleObjCGCTypeAttr(TypeProcessingState &state, 3222 AttributeList &attr, 3223 QualType &type) { 3224 Sema &S = state.getSema(); 3225 3226 // Delay if this isn't some kind of pointer. 3227 if (!type->isPointerType() && 3228 !type->isObjCObjectPointerType() && 3229 !type->isBlockPointerType()) 3230 return false; 3231 3232 if (type.getObjCGCAttr() != Qualifiers::GCNone) { 3233 S.Diag(attr.getLoc(), diag::err_attribute_multiple_objc_gc); 3234 attr.setInvalid(); 3235 return true; 3236 } 3237 3238 // Check the attribute arguments. 3239 if (!attr.getParameterName()) { 3240 S.Diag(attr.getLoc(), diag::err_attribute_argument_n_not_string) 3241 << "objc_gc" << 1; 3242 attr.setInvalid(); 3243 return true; 3244 } 3245 Qualifiers::GC GCAttr; 3246 if (attr.getNumArgs() != 0) { 3247 S.Diag(attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 3248 attr.setInvalid(); 3249 return true; 3250 } 3251 if (attr.getParameterName()->isStr("weak")) 3252 GCAttr = Qualifiers::Weak; 3253 else if (attr.getParameterName()->isStr("strong")) 3254 GCAttr = Qualifiers::Strong; 3255 else { 3256 S.Diag(attr.getLoc(), diag::warn_attribute_type_not_supported) 3257 << "objc_gc" << attr.getParameterName(); 3258 attr.setInvalid(); 3259 return true; 3260 } 3261 3262 QualType origType = type; 3263 type = S.Context.getObjCGCQualType(origType, GCAttr); 3264 3265 // Make an attributed type to preserve the source information. 3266 if (attr.getLoc().isValid()) 3267 type = S.Context.getAttributedType(AttributedType::attr_objc_gc, 3268 origType, type); 3269 3270 return true; 3271} 3272 3273namespace { 3274 /// A helper class to unwrap a type down to a function for the 3275 /// purposes of applying attributes there. 3276 /// 3277 /// Use: 3278 /// FunctionTypeUnwrapper unwrapped(SemaRef, T); 3279 /// if (unwrapped.isFunctionType()) { 3280 /// const FunctionType *fn = unwrapped.get(); 3281 /// // change fn somehow 3282 /// T = unwrapped.wrap(fn); 3283 /// } 3284 struct FunctionTypeUnwrapper { 3285 enum WrapKind { 3286 Desugar, 3287 Parens, 3288 Pointer, 3289 BlockPointer, 3290 Reference, 3291 MemberPointer 3292 }; 3293 3294 QualType Original; 3295 const FunctionType *Fn; 3296 llvm::SmallVector<unsigned char /*WrapKind*/, 8> Stack; 3297 3298 FunctionTypeUnwrapper(Sema &S, QualType T) : Original(T) { 3299 while (true) { 3300 const Type *Ty = T.getTypePtr(); 3301 if (isa<FunctionType>(Ty)) { 3302 Fn = cast<FunctionType>(Ty); 3303 return; 3304 } else if (isa<ParenType>(Ty)) { 3305 T = cast<ParenType>(Ty)->getInnerType(); 3306 Stack.push_back(Parens); 3307 } else if (isa<PointerType>(Ty)) { 3308 T = cast<PointerType>(Ty)->getPointeeType(); 3309 Stack.push_back(Pointer); 3310 } else if (isa<BlockPointerType>(Ty)) { 3311 T = cast<BlockPointerType>(Ty)->getPointeeType(); 3312 Stack.push_back(BlockPointer); 3313 } else if (isa<MemberPointerType>(Ty)) { 3314 T = cast<MemberPointerType>(Ty)->getPointeeType(); 3315 Stack.push_back(MemberPointer); 3316 } else if (isa<ReferenceType>(Ty)) { 3317 T = cast<ReferenceType>(Ty)->getPointeeType(); 3318 Stack.push_back(Reference); 3319 } else { 3320 const Type *DTy = Ty->getUnqualifiedDesugaredType(); 3321 if (Ty == DTy) { 3322 Fn = 0; 3323 return; 3324 } 3325 3326 T = QualType(DTy, 0); 3327 Stack.push_back(Desugar); 3328 } 3329 } 3330 } 3331 3332 bool isFunctionType() const { return (Fn != 0); } 3333 const FunctionType *get() const { return Fn; } 3334 3335 QualType wrap(Sema &S, const FunctionType *New) { 3336 // If T wasn't modified from the unwrapped type, do nothing. 3337 if (New == get()) return Original; 3338 3339 Fn = New; 3340 return wrap(S.Context, Original, 0); 3341 } 3342 3343 private: 3344 QualType wrap(ASTContext &C, QualType Old, unsigned I) { 3345 if (I == Stack.size()) 3346 return C.getQualifiedType(Fn, Old.getQualifiers()); 3347 3348 // Build up the inner type, applying the qualifiers from the old 3349 // type to the new type. 3350 SplitQualType SplitOld = Old.split(); 3351 3352 // As a special case, tail-recurse if there are no qualifiers. 3353 if (SplitOld.second.empty()) 3354 return wrap(C, SplitOld.first, I); 3355 return C.getQualifiedType(wrap(C, SplitOld.first, I), SplitOld.second); 3356 } 3357 3358 QualType wrap(ASTContext &C, const Type *Old, unsigned I) { 3359 if (I == Stack.size()) return QualType(Fn, 0); 3360 3361 switch (static_cast<WrapKind>(Stack[I++])) { 3362 case Desugar: 3363 // This is the point at which we potentially lose source 3364 // information. 3365 return wrap(C, Old->getUnqualifiedDesugaredType(), I); 3366 3367 case Parens: { 3368 QualType New = wrap(C, cast<ParenType>(Old)->getInnerType(), I); 3369 return C.getParenType(New); 3370 } 3371 3372 case Pointer: { 3373 QualType New = wrap(C, cast<PointerType>(Old)->getPointeeType(), I); 3374 return C.getPointerType(New); 3375 } 3376 3377 case BlockPointer: { 3378 QualType New = wrap(C, cast<BlockPointerType>(Old)->getPointeeType(),I); 3379 return C.getBlockPointerType(New); 3380 } 3381 3382 case MemberPointer: { 3383 const MemberPointerType *OldMPT = cast<MemberPointerType>(Old); 3384 QualType New = wrap(C, OldMPT->getPointeeType(), I); 3385 return C.getMemberPointerType(New, OldMPT->getClass()); 3386 } 3387 3388 case Reference: { 3389 const ReferenceType *OldRef = cast<ReferenceType>(Old); 3390 QualType New = wrap(C, OldRef->getPointeeType(), I); 3391 if (isa<LValueReferenceType>(OldRef)) 3392 return C.getLValueReferenceType(New, OldRef->isSpelledAsLValue()); 3393 else 3394 return C.getRValueReferenceType(New); 3395 } 3396 } 3397 3398 llvm_unreachable("unknown wrapping kind"); 3399 return QualType(); 3400 } 3401 }; 3402} 3403 3404/// Process an individual function attribute. Returns true to 3405/// indicate that the attribute was handled, false if it wasn't. 3406static bool handleFunctionTypeAttr(TypeProcessingState &state, 3407 AttributeList &attr, 3408 QualType &type) { 3409 Sema &S = state.getSema(); 3410 3411 FunctionTypeUnwrapper unwrapped(S, type); 3412 3413 if (attr.getKind() == AttributeList::AT_noreturn) { 3414 if (S.CheckNoReturnAttr(attr)) 3415 return true; 3416 3417 // Delay if this is not a function type. 3418 if (!unwrapped.isFunctionType()) 3419 return false; 3420 3421 // Otherwise we can process right away. 3422 FunctionType::ExtInfo EI = unwrapped.get()->getExtInfo().withNoReturn(true); 3423 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 3424 return true; 3425 } 3426 3427 // ns_returns_retained is not always a type attribute, but if we got 3428 // here, we're treating it as one right now. 3429 if (attr.getKind() == AttributeList::AT_ns_returns_retained) { 3430 assert(S.getLangOptions().ObjCAutoRefCount && 3431 "ns_returns_retained treated as type attribute in non-ARC"); 3432 if (attr.getNumArgs()) return true; 3433 3434 // Delay if this is not a function type. 3435 if (!unwrapped.isFunctionType()) 3436 return false; 3437 3438 FunctionType::ExtInfo EI 3439 = unwrapped.get()->getExtInfo().withProducesResult(true); 3440 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 3441 return true; 3442 } 3443 3444 if (attr.getKind() == AttributeList::AT_regparm) { 3445 unsigned value; 3446 if (S.CheckRegparmAttr(attr, value)) 3447 return true; 3448 3449 // Delay if this is not a function type. 3450 if (!unwrapped.isFunctionType()) 3451 return false; 3452 3453 // Diagnose regparm with fastcall. 3454 const FunctionType *fn = unwrapped.get(); 3455 CallingConv CC = fn->getCallConv(); 3456 if (CC == CC_X86FastCall) { 3457 S.Diag(attr.getLoc(), diag::err_attributes_are_not_compatible) 3458 << FunctionType::getNameForCallConv(CC) 3459 << "regparm"; 3460 attr.setInvalid(); 3461 return true; 3462 } 3463 3464 FunctionType::ExtInfo EI = 3465 unwrapped.get()->getExtInfo().withRegParm(value); 3466 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 3467 return true; 3468 } 3469 3470 // Otherwise, a calling convention. 3471 CallingConv CC; 3472 if (S.CheckCallingConvAttr(attr, CC)) 3473 return true; 3474 3475 // Delay if the type didn't work out to a function. 3476 if (!unwrapped.isFunctionType()) return false; 3477 3478 const FunctionType *fn = unwrapped.get(); 3479 CallingConv CCOld = fn->getCallConv(); 3480 if (S.Context.getCanonicalCallConv(CC) == 3481 S.Context.getCanonicalCallConv(CCOld)) { 3482 FunctionType::ExtInfo EI= unwrapped.get()->getExtInfo().withCallingConv(CC); 3483 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 3484 return true; 3485 } 3486 3487 if (CCOld != CC_Default) { 3488 // Should we diagnose reapplications of the same convention? 3489 S.Diag(attr.getLoc(), diag::err_attributes_are_not_compatible) 3490 << FunctionType::getNameForCallConv(CC) 3491 << FunctionType::getNameForCallConv(CCOld); 3492 attr.setInvalid(); 3493 return true; 3494 } 3495 3496 // Diagnose the use of X86 fastcall on varargs or unprototyped functions. 3497 if (CC == CC_X86FastCall) { 3498 if (isa<FunctionNoProtoType>(fn)) { 3499 S.Diag(attr.getLoc(), diag::err_cconv_knr) 3500 << FunctionType::getNameForCallConv(CC); 3501 attr.setInvalid(); 3502 return true; 3503 } 3504 3505 const FunctionProtoType *FnP = cast<FunctionProtoType>(fn); 3506 if (FnP->isVariadic()) { 3507 S.Diag(attr.getLoc(), diag::err_cconv_varargs) 3508 << FunctionType::getNameForCallConv(CC); 3509 attr.setInvalid(); 3510 return true; 3511 } 3512 3513 // Also diagnose fastcall with regparm. 3514 if (fn->getHasRegParm()) { 3515 S.Diag(attr.getLoc(), diag::err_attributes_are_not_compatible) 3516 << "regparm" 3517 << FunctionType::getNameForCallConv(CC); 3518 attr.setInvalid(); 3519 return true; 3520 } 3521 } 3522 3523 FunctionType::ExtInfo EI = unwrapped.get()->getExtInfo().withCallingConv(CC); 3524 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 3525 return true; 3526} 3527 3528/// Handle OpenCL image access qualifiers: read_only, write_only, read_write 3529static void HandleOpenCLImageAccessAttribute(QualType& CurType, 3530 const AttributeList &Attr, 3531 Sema &S) { 3532 // Check the attribute arguments. 3533 if (Attr.getNumArgs() != 1) { 3534 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 3535 Attr.setInvalid(); 3536 return; 3537 } 3538 Expr *sizeExpr = static_cast<Expr *>(Attr.getArg(0)); 3539 llvm::APSInt arg(32); 3540 if (sizeExpr->isTypeDependent() || sizeExpr->isValueDependent() || 3541 !sizeExpr->isIntegerConstantExpr(arg, S.Context)) { 3542 S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int) 3543 << "opencl_image_access" << sizeExpr->getSourceRange(); 3544 Attr.setInvalid(); 3545 return; 3546 } 3547 unsigned iarg = static_cast<unsigned>(arg.getZExtValue()); 3548 switch (iarg) { 3549 case CLIA_read_only: 3550 case CLIA_write_only: 3551 case CLIA_read_write: 3552 // Implemented in a separate patch 3553 break; 3554 default: 3555 // Implemented in a separate patch 3556 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_size) 3557 << sizeExpr->getSourceRange(); 3558 Attr.setInvalid(); 3559 break; 3560 } 3561} 3562 3563/// HandleVectorSizeAttribute - this attribute is only applicable to integral 3564/// and float scalars, although arrays, pointers, and function return values are 3565/// allowed in conjunction with this construct. Aggregates with this attribute 3566/// are invalid, even if they are of the same size as a corresponding scalar. 3567/// The raw attribute should contain precisely 1 argument, the vector size for 3568/// the variable, measured in bytes. If curType and rawAttr are well formed, 3569/// this routine will return a new vector type. 3570static void HandleVectorSizeAttr(QualType& CurType, const AttributeList &Attr, 3571 Sema &S) { 3572 // Check the attribute arguments. 3573 if (Attr.getNumArgs() != 1) { 3574 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 3575 Attr.setInvalid(); 3576 return; 3577 } 3578 Expr *sizeExpr = static_cast<Expr *>(Attr.getArg(0)); 3579 llvm::APSInt vecSize(32); 3580 if (sizeExpr->isTypeDependent() || sizeExpr->isValueDependent() || 3581 !sizeExpr->isIntegerConstantExpr(vecSize, S.Context)) { 3582 S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int) 3583 << "vector_size" << sizeExpr->getSourceRange(); 3584 Attr.setInvalid(); 3585 return; 3586 } 3587 // the base type must be integer or float, and can't already be a vector. 3588 if (!CurType->isIntegerType() && !CurType->isRealFloatingType()) { 3589 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_vector_type) << CurType; 3590 Attr.setInvalid(); 3591 return; 3592 } 3593 unsigned typeSize = static_cast<unsigned>(S.Context.getTypeSize(CurType)); 3594 // vecSize is specified in bytes - convert to bits. 3595 unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue() * 8); 3596 3597 // the vector size needs to be an integral multiple of the type size. 3598 if (vectorSize % typeSize) { 3599 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_size) 3600 << sizeExpr->getSourceRange(); 3601 Attr.setInvalid(); 3602 return; 3603 } 3604 if (vectorSize == 0) { 3605 S.Diag(Attr.getLoc(), diag::err_attribute_zero_size) 3606 << sizeExpr->getSourceRange(); 3607 Attr.setInvalid(); 3608 return; 3609 } 3610 3611 // Success! Instantiate the vector type, the number of elements is > 0, and 3612 // not required to be a power of 2, unlike GCC. 3613 CurType = S.Context.getVectorType(CurType, vectorSize/typeSize, 3614 VectorType::GenericVector); 3615} 3616 3617/// \brief Process the OpenCL-like ext_vector_type attribute when it occurs on 3618/// a type. 3619static void HandleExtVectorTypeAttr(QualType &CurType, 3620 const AttributeList &Attr, 3621 Sema &S) { 3622 Expr *sizeExpr; 3623 3624 // Special case where the argument is a template id. 3625 if (Attr.getParameterName()) { 3626 CXXScopeSpec SS; 3627 UnqualifiedId id; 3628 id.setIdentifier(Attr.getParameterName(), Attr.getLoc()); 3629 3630 ExprResult Size = S.ActOnIdExpression(S.getCurScope(), SS, id, false, 3631 false); 3632 if (Size.isInvalid()) 3633 return; 3634 3635 sizeExpr = Size.get(); 3636 } else { 3637 // check the attribute arguments. 3638 if (Attr.getNumArgs() != 1) { 3639 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 3640 return; 3641 } 3642 sizeExpr = Attr.getArg(0); 3643 } 3644 3645 // Create the vector type. 3646 QualType T = S.BuildExtVectorType(CurType, sizeExpr, Attr.getLoc()); 3647 if (!T.isNull()) 3648 CurType = T; 3649} 3650 3651/// HandleNeonVectorTypeAttr - The "neon_vector_type" and 3652/// "neon_polyvector_type" attributes are used to create vector types that 3653/// are mangled according to ARM's ABI. Otherwise, these types are identical 3654/// to those created with the "vector_size" attribute. Unlike "vector_size" 3655/// the argument to these Neon attributes is the number of vector elements, 3656/// not the vector size in bytes. The vector width and element type must 3657/// match one of the standard Neon vector types. 3658static void HandleNeonVectorTypeAttr(QualType& CurType, 3659 const AttributeList &Attr, Sema &S, 3660 VectorType::VectorKind VecKind, 3661 const char *AttrName) { 3662 // Check the attribute arguments. 3663 if (Attr.getNumArgs() != 1) { 3664 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 3665 Attr.setInvalid(); 3666 return; 3667 } 3668 // The number of elements must be an ICE. 3669 Expr *numEltsExpr = static_cast<Expr *>(Attr.getArg(0)); 3670 llvm::APSInt numEltsInt(32); 3671 if (numEltsExpr->isTypeDependent() || numEltsExpr->isValueDependent() || 3672 !numEltsExpr->isIntegerConstantExpr(numEltsInt, S.Context)) { 3673 S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int) 3674 << AttrName << numEltsExpr->getSourceRange(); 3675 Attr.setInvalid(); 3676 return; 3677 } 3678 // Only certain element types are supported for Neon vectors. 3679 const BuiltinType* BTy = CurType->getAs<BuiltinType>(); 3680 if (!BTy || 3681 (VecKind == VectorType::NeonPolyVector && 3682 BTy->getKind() != BuiltinType::SChar && 3683 BTy->getKind() != BuiltinType::Short) || 3684 (BTy->getKind() != BuiltinType::SChar && 3685 BTy->getKind() != BuiltinType::UChar && 3686 BTy->getKind() != BuiltinType::Short && 3687 BTy->getKind() != BuiltinType::UShort && 3688 BTy->getKind() != BuiltinType::Int && 3689 BTy->getKind() != BuiltinType::UInt && 3690 BTy->getKind() != BuiltinType::LongLong && 3691 BTy->getKind() != BuiltinType::ULongLong && 3692 BTy->getKind() != BuiltinType::Float)) { 3693 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_vector_type) <<CurType; 3694 Attr.setInvalid(); 3695 return; 3696 } 3697 // The total size of the vector must be 64 or 128 bits. 3698 unsigned typeSize = static_cast<unsigned>(S.Context.getTypeSize(CurType)); 3699 unsigned numElts = static_cast<unsigned>(numEltsInt.getZExtValue()); 3700 unsigned vecSize = typeSize * numElts; 3701 if (vecSize != 64 && vecSize != 128) { 3702 S.Diag(Attr.getLoc(), diag::err_attribute_bad_neon_vector_size) << CurType; 3703 Attr.setInvalid(); 3704 return; 3705 } 3706 3707 CurType = S.Context.getVectorType(CurType, numElts, VecKind); 3708} 3709 3710static void processTypeAttrs(TypeProcessingState &state, QualType &type, 3711 bool isDeclSpec, AttributeList *attrs) { 3712 // Scan through and apply attributes to this type where it makes sense. Some 3713 // attributes (such as __address_space__, __vector_size__, etc) apply to the 3714 // type, but others can be present in the type specifiers even though they 3715 // apply to the decl. Here we apply type attributes and ignore the rest. 3716 3717 AttributeList *next; 3718 do { 3719 AttributeList &attr = *attrs; 3720 next = attr.getNext(); 3721 3722 // Skip attributes that were marked to be invalid. 3723 if (attr.isInvalid()) 3724 continue; 3725 3726 // If this is an attribute we can handle, do so now, 3727 // otherwise, add it to the FnAttrs list for rechaining. 3728 switch (attr.getKind()) { 3729 default: break; 3730 3731 case AttributeList::AT_address_space: 3732 HandleAddressSpaceTypeAttribute(type, attr, state.getSema()); 3733 break; 3734 OBJC_POINTER_TYPE_ATTRS_CASELIST: 3735 if (!handleObjCPointerTypeAttr(state, attr, type)) 3736 distributeObjCPointerTypeAttr(state, attr, type); 3737 break; 3738 case AttributeList::AT_vector_size: 3739 HandleVectorSizeAttr(type, attr, state.getSema()); 3740 break; 3741 case AttributeList::AT_ext_vector_type: 3742 if (state.getDeclarator().getDeclSpec().getStorageClassSpec() 3743 != DeclSpec::SCS_typedef) 3744 HandleExtVectorTypeAttr(type, attr, state.getSema()); 3745 break; 3746 case AttributeList::AT_neon_vector_type: 3747 HandleNeonVectorTypeAttr(type, attr, state.getSema(), 3748 VectorType::NeonVector, "neon_vector_type"); 3749 break; 3750 case AttributeList::AT_neon_polyvector_type: 3751 HandleNeonVectorTypeAttr(type, attr, state.getSema(), 3752 VectorType::NeonPolyVector, 3753 "neon_polyvector_type"); 3754 break; 3755 case AttributeList::AT_opencl_image_access: 3756 HandleOpenCLImageAccessAttribute(type, attr, state.getSema()); 3757 break; 3758 3759 case AttributeList::AT_ns_returns_retained: 3760 if (!state.getSema().getLangOptions().ObjCAutoRefCount) 3761 break; 3762 // fallthrough into the function attrs 3763 3764 FUNCTION_TYPE_ATTRS_CASELIST: 3765 // Never process function type attributes as part of the 3766 // declaration-specifiers. 3767 if (isDeclSpec) 3768 distributeFunctionTypeAttrFromDeclSpec(state, attr, type); 3769 3770 // Otherwise, handle the possible delays. 3771 else if (!handleFunctionTypeAttr(state, attr, type)) 3772 distributeFunctionTypeAttr(state, attr, type); 3773 break; 3774 } 3775 } while ((attrs = next)); 3776} 3777 3778/// \brief Ensure that the type of the given expression is complete. 3779/// 3780/// This routine checks whether the expression \p E has a complete type. If the 3781/// expression refers to an instantiable construct, that instantiation is 3782/// performed as needed to complete its type. Furthermore 3783/// Sema::RequireCompleteType is called for the expression's type (or in the 3784/// case of a reference type, the referred-to type). 3785/// 3786/// \param E The expression whose type is required to be complete. 3787/// \param PD The partial diagnostic that will be printed out if the type cannot 3788/// be completed. 3789/// 3790/// \returns \c true if the type of \p E is incomplete and diagnosed, \c false 3791/// otherwise. 3792bool Sema::RequireCompleteExprType(Expr *E, const PartialDiagnostic &PD, 3793 std::pair<SourceLocation, 3794 PartialDiagnostic> Note) { 3795 QualType T = E->getType(); 3796 3797 // Fast path the case where the type is already complete. 3798 if (!T->isIncompleteType()) 3799 return false; 3800 3801 // Incomplete array types may be completed by the initializer attached to 3802 // their definitions. For static data members of class templates we need to 3803 // instantiate the definition to get this initializer and complete the type. 3804 if (T->isIncompleteArrayType()) { 3805 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E->IgnoreParens())) { 3806 if (VarDecl *Var = dyn_cast<VarDecl>(DRE->getDecl())) { 3807 if (Var->isStaticDataMember() && 3808 Var->getInstantiatedFromStaticDataMember()) { 3809 3810 MemberSpecializationInfo *MSInfo = Var->getMemberSpecializationInfo(); 3811 assert(MSInfo && "Missing member specialization information?"); 3812 if (MSInfo->getTemplateSpecializationKind() 3813 != TSK_ExplicitSpecialization) { 3814 // If we don't already have a point of instantiation, this is it. 3815 if (MSInfo->getPointOfInstantiation().isInvalid()) { 3816 MSInfo->setPointOfInstantiation(E->getLocStart()); 3817 3818 // This is a modification of an existing AST node. Notify 3819 // listeners. 3820 if (ASTMutationListener *L = getASTMutationListener()) 3821 L->StaticDataMemberInstantiated(Var); 3822 } 3823 3824 InstantiateStaticDataMemberDefinition(E->getExprLoc(), Var); 3825 3826 // Update the type to the newly instantiated definition's type both 3827 // here and within the expression. 3828 if (VarDecl *Def = Var->getDefinition()) { 3829 DRE->setDecl(Def); 3830 T = Def->getType(); 3831 DRE->setType(T); 3832 E->setType(T); 3833 } 3834 } 3835 3836 // We still go on to try to complete the type independently, as it 3837 // may also require instantiations or diagnostics if it remains 3838 // incomplete. 3839 } 3840 } 3841 } 3842 } 3843 3844 // FIXME: Are there other cases which require instantiating something other 3845 // than the type to complete the type of an expression? 3846 3847 // Look through reference types and complete the referred type. 3848 if (const ReferenceType *Ref = T->getAs<ReferenceType>()) 3849 T = Ref->getPointeeType(); 3850 3851 return RequireCompleteType(E->getExprLoc(), T, PD, Note); 3852} 3853 3854/// @brief Ensure that the type T is a complete type. 3855/// 3856/// This routine checks whether the type @p T is complete in any 3857/// context where a complete type is required. If @p T is a complete 3858/// type, returns false. If @p T is a class template specialization, 3859/// this routine then attempts to perform class template 3860/// instantiation. If instantiation fails, or if @p T is incomplete 3861/// and cannot be completed, issues the diagnostic @p diag (giving it 3862/// the type @p T) and returns true. 3863/// 3864/// @param Loc The location in the source that the incomplete type 3865/// diagnostic should refer to. 3866/// 3867/// @param T The type that this routine is examining for completeness. 3868/// 3869/// @param PD The partial diagnostic that will be printed out if T is not a 3870/// complete type. 3871/// 3872/// @returns @c true if @p T is incomplete and a diagnostic was emitted, 3873/// @c false otherwise. 3874bool Sema::RequireCompleteType(SourceLocation Loc, QualType T, 3875 const PartialDiagnostic &PD, 3876 std::pair<SourceLocation, 3877 PartialDiagnostic> Note) { 3878 unsigned diag = PD.getDiagID(); 3879 3880 // FIXME: Add this assertion to make sure we always get instantiation points. 3881 // assert(!Loc.isInvalid() && "Invalid location in RequireCompleteType"); 3882 // FIXME: Add this assertion to help us flush out problems with 3883 // checking for dependent types and type-dependent expressions. 3884 // 3885 // assert(!T->isDependentType() && 3886 // "Can't ask whether a dependent type is complete"); 3887 3888 // If we have a complete type, we're done. 3889 if (!T->isIncompleteType()) 3890 return false; 3891 3892 // If we have a class template specialization or a class member of a 3893 // class template specialization, or an array with known size of such, 3894 // try to instantiate it. 3895 QualType MaybeTemplate = T; 3896 if (const ConstantArrayType *Array = Context.getAsConstantArrayType(T)) 3897 MaybeTemplate = Array->getElementType(); 3898 if (const RecordType *Record = MaybeTemplate->getAs<RecordType>()) { 3899 if (ClassTemplateSpecializationDecl *ClassTemplateSpec 3900 = dyn_cast<ClassTemplateSpecializationDecl>(Record->getDecl())) { 3901 if (ClassTemplateSpec->getSpecializationKind() == TSK_Undeclared) 3902 return InstantiateClassTemplateSpecialization(Loc, ClassTemplateSpec, 3903 TSK_ImplicitInstantiation, 3904 /*Complain=*/diag != 0); 3905 } else if (CXXRecordDecl *Rec 3906 = dyn_cast<CXXRecordDecl>(Record->getDecl())) { 3907 if (CXXRecordDecl *Pattern = Rec->getInstantiatedFromMemberClass()) { 3908 MemberSpecializationInfo *MSInfo = Rec->getMemberSpecializationInfo(); 3909 assert(MSInfo && "Missing member specialization information?"); 3910 // This record was instantiated from a class within a template. 3911 if (MSInfo->getTemplateSpecializationKind() 3912 != TSK_ExplicitSpecialization) 3913 return InstantiateClass(Loc, Rec, Pattern, 3914 getTemplateInstantiationArgs(Rec), 3915 TSK_ImplicitInstantiation, 3916 /*Complain=*/diag != 0); 3917 } 3918 } 3919 } 3920 3921 if (diag == 0) 3922 return true; 3923 3924 const TagType *Tag = T->getAs<TagType>(); 3925 3926 // Avoid diagnosing invalid decls as incomplete. 3927 if (Tag && Tag->getDecl()->isInvalidDecl()) 3928 return true; 3929 3930 // Give the external AST source a chance to complete the type. 3931 if (Tag && Tag->getDecl()->hasExternalLexicalStorage()) { 3932 Context.getExternalSource()->CompleteType(Tag->getDecl()); 3933 if (!Tag->isIncompleteType()) 3934 return false; 3935 } 3936 3937 // We have an incomplete type. Produce a diagnostic. 3938 Diag(Loc, PD) << T; 3939 3940 // If we have a note, produce it. 3941 if (!Note.first.isInvalid()) 3942 Diag(Note.first, Note.second); 3943 3944 // If the type was a forward declaration of a class/struct/union 3945 // type, produce a note. 3946 if (Tag && !Tag->getDecl()->isInvalidDecl()) 3947 Diag(Tag->getDecl()->getLocation(), 3948 Tag->isBeingDefined() ? diag::note_type_being_defined 3949 : diag::note_forward_declaration) 3950 << QualType(Tag, 0); 3951 3952 return true; 3953} 3954 3955bool Sema::RequireCompleteType(SourceLocation Loc, QualType T, 3956 const PartialDiagnostic &PD) { 3957 return RequireCompleteType(Loc, T, PD, 3958 std::make_pair(SourceLocation(), PDiag(0))); 3959} 3960 3961bool Sema::RequireCompleteType(SourceLocation Loc, QualType T, 3962 unsigned DiagID) { 3963 return RequireCompleteType(Loc, T, PDiag(DiagID), 3964 std::make_pair(SourceLocation(), PDiag(0))); 3965} 3966 3967/// \brief Retrieve a version of the type 'T' that is elaborated by Keyword 3968/// and qualified by the nested-name-specifier contained in SS. 3969QualType Sema::getElaboratedType(ElaboratedTypeKeyword Keyword, 3970 const CXXScopeSpec &SS, QualType T) { 3971 if (T.isNull()) 3972 return T; 3973 NestedNameSpecifier *NNS; 3974 if (SS.isValid()) 3975 NNS = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 3976 else { 3977 if (Keyword == ETK_None) 3978 return T; 3979 NNS = 0; 3980 } 3981 return Context.getElaboratedType(Keyword, NNS, T); 3982} 3983 3984QualType Sema::BuildTypeofExprType(Expr *E, SourceLocation Loc) { 3985 ExprResult ER = CheckPlaceholderExpr(E); 3986 if (ER.isInvalid()) return QualType(); 3987 E = ER.take(); 3988 3989 if (!E->isTypeDependent()) { 3990 QualType T = E->getType(); 3991 if (const TagType *TT = T->getAs<TagType>()) 3992 DiagnoseUseOfDecl(TT->getDecl(), E->getExprLoc()); 3993 } 3994 return Context.getTypeOfExprType(E); 3995} 3996 3997QualType Sema::BuildDecltypeType(Expr *E, SourceLocation Loc) { 3998 ExprResult ER = CheckPlaceholderExpr(E); 3999 if (ER.isInvalid()) return QualType(); 4000 E = ER.take(); 4001 4002 return Context.getDecltypeType(E); 4003} 4004 4005QualType Sema::BuildUnaryTransformType(QualType BaseType, 4006 UnaryTransformType::UTTKind UKind, 4007 SourceLocation Loc) { 4008 switch (UKind) { 4009 case UnaryTransformType::EnumUnderlyingType: 4010 if (!BaseType->isDependentType() && !BaseType->isEnumeralType()) { 4011 Diag(Loc, diag::err_only_enums_have_underlying_types); 4012 return QualType(); 4013 } else { 4014 QualType Underlying = BaseType; 4015 if (!BaseType->isDependentType()) { 4016 EnumDecl *ED = BaseType->getAs<EnumType>()->getDecl(); 4017 assert(ED && "EnumType has no EnumDecl"); 4018 DiagnoseUseOfDecl(ED, Loc); 4019 Underlying = ED->getIntegerType(); 4020 } 4021 assert(!Underlying.isNull()); 4022 return Context.getUnaryTransformType(BaseType, Underlying, 4023 UnaryTransformType::EnumUnderlyingType); 4024 } 4025 } 4026 llvm_unreachable("unknown unary transform type"); 4027} 4028