SemaType.cpp revision f8af98286022f72157d84951b48fde5fb369ab29
1//===--- SemaType.cpp - Semantic Analysis for Types -----------------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements type-related semantic analysis. 11// 12//===----------------------------------------------------------------------===// 13 14#include "clang/Sema/ScopeInfo.h" 15#include "clang/Sema/SemaInternal.h" 16#include "clang/Sema/Template.h" 17#include "clang/Basic/OpenCL.h" 18#include "clang/AST/ASTContext.h" 19#include "clang/AST/ASTMutationListener.h" 20#include "clang/AST/CXXInheritance.h" 21#include "clang/AST/DeclObjC.h" 22#include "clang/AST/DeclTemplate.h" 23#include "clang/AST/TypeLoc.h" 24#include "clang/AST/TypeLocVisitor.h" 25#include "clang/AST/Expr.h" 26#include "clang/Basic/PartialDiagnostic.h" 27#include "clang/Basic/TargetInfo.h" 28#include "clang/Lex/Preprocessor.h" 29#include "clang/Sema/DeclSpec.h" 30#include "clang/Sema/DelayedDiagnostic.h" 31#include "clang/Sema/Lookup.h" 32#include "llvm/ADT/SmallPtrSet.h" 33#include "llvm/Support/ErrorHandling.h" 34using namespace clang; 35 36/// isOmittedBlockReturnType - Return true if this declarator is missing a 37/// return type because this is a omitted return type on a block literal. 38static bool isOmittedBlockReturnType(const Declarator &D) { 39 if (D.getContext() != Declarator::BlockLiteralContext || 40 D.getDeclSpec().hasTypeSpecifier()) 41 return false; 42 43 if (D.getNumTypeObjects() == 0) 44 return true; // ^{ ... } 45 46 if (D.getNumTypeObjects() == 1 && 47 D.getTypeObject(0).Kind == DeclaratorChunk::Function) 48 return true; // ^(int X, float Y) { ... } 49 50 return false; 51} 52 53/// diagnoseBadTypeAttribute - Diagnoses a type attribute which 54/// doesn't apply to the given type. 55static void diagnoseBadTypeAttribute(Sema &S, const AttributeList &attr, 56 QualType type) { 57 bool useExpansionLoc = false; 58 59 unsigned diagID = 0; 60 switch (attr.getKind()) { 61 case AttributeList::AT_objc_gc: 62 diagID = diag::warn_pointer_attribute_wrong_type; 63 useExpansionLoc = true; 64 break; 65 66 case AttributeList::AT_objc_ownership: 67 diagID = diag::warn_objc_object_attribute_wrong_type; 68 useExpansionLoc = true; 69 break; 70 71 default: 72 // Assume everything else was a function attribute. 73 diagID = diag::warn_function_attribute_wrong_type; 74 break; 75 } 76 77 SourceLocation loc = attr.getLoc(); 78 StringRef name = attr.getName()->getName(); 79 80 // The GC attributes are usually written with macros; special-case them. 81 if (useExpansionLoc && loc.isMacroID() && attr.getParameterName()) { 82 if (attr.getParameterName()->isStr("strong")) { 83 if (S.findMacroSpelling(loc, "__strong")) name = "__strong"; 84 } else if (attr.getParameterName()->isStr("weak")) { 85 if (S.findMacroSpelling(loc, "__weak")) name = "__weak"; 86 } 87 } 88 89 S.Diag(loc, diagID) << name << type; 90} 91 92// objc_gc applies to Objective-C pointers or, otherwise, to the 93// smallest available pointer type (i.e. 'void*' in 'void**'). 94#define OBJC_POINTER_TYPE_ATTRS_CASELIST \ 95 case AttributeList::AT_objc_gc: \ 96 case AttributeList::AT_objc_ownership 97 98// Function type attributes. 99#define FUNCTION_TYPE_ATTRS_CASELIST \ 100 case AttributeList::AT_noreturn: \ 101 case AttributeList::AT_cdecl: \ 102 case AttributeList::AT_fastcall: \ 103 case AttributeList::AT_stdcall: \ 104 case AttributeList::AT_thiscall: \ 105 case AttributeList::AT_pascal: \ 106 case AttributeList::AT_regparm: \ 107 case AttributeList::AT_pcs \ 108 109namespace { 110 /// An object which stores processing state for the entire 111 /// GetTypeForDeclarator process. 112 class TypeProcessingState { 113 Sema &sema; 114 115 /// The declarator being processed. 116 Declarator &declarator; 117 118 /// The index of the declarator chunk we're currently processing. 119 /// May be the total number of valid chunks, indicating the 120 /// DeclSpec. 121 unsigned chunkIndex; 122 123 /// Whether there are non-trivial modifications to the decl spec. 124 bool trivial; 125 126 /// Whether we saved the attributes in the decl spec. 127 bool hasSavedAttrs; 128 129 /// The original set of attributes on the DeclSpec. 130 SmallVector<AttributeList*, 2> savedAttrs; 131 132 /// A list of attributes to diagnose the uselessness of when the 133 /// processing is complete. 134 SmallVector<AttributeList*, 2> ignoredTypeAttrs; 135 136 public: 137 TypeProcessingState(Sema &sema, Declarator &declarator) 138 : sema(sema), declarator(declarator), 139 chunkIndex(declarator.getNumTypeObjects()), 140 trivial(true), hasSavedAttrs(false) {} 141 142 Sema &getSema() const { 143 return sema; 144 } 145 146 Declarator &getDeclarator() const { 147 return declarator; 148 } 149 150 unsigned getCurrentChunkIndex() const { 151 return chunkIndex; 152 } 153 154 void setCurrentChunkIndex(unsigned idx) { 155 assert(idx <= declarator.getNumTypeObjects()); 156 chunkIndex = idx; 157 } 158 159 AttributeList *&getCurrentAttrListRef() const { 160 assert(chunkIndex <= declarator.getNumTypeObjects()); 161 if (chunkIndex == declarator.getNumTypeObjects()) 162 return getMutableDeclSpec().getAttributes().getListRef(); 163 return declarator.getTypeObject(chunkIndex).getAttrListRef(); 164 } 165 166 /// Save the current set of attributes on the DeclSpec. 167 void saveDeclSpecAttrs() { 168 // Don't try to save them multiple times. 169 if (hasSavedAttrs) return; 170 171 DeclSpec &spec = getMutableDeclSpec(); 172 for (AttributeList *attr = spec.getAttributes().getList(); attr; 173 attr = attr->getNext()) 174 savedAttrs.push_back(attr); 175 trivial &= savedAttrs.empty(); 176 hasSavedAttrs = true; 177 } 178 179 /// Record that we had nowhere to put the given type attribute. 180 /// We will diagnose such attributes later. 181 void addIgnoredTypeAttr(AttributeList &attr) { 182 ignoredTypeAttrs.push_back(&attr); 183 } 184 185 /// Diagnose all the ignored type attributes, given that the 186 /// declarator worked out to the given type. 187 void diagnoseIgnoredTypeAttrs(QualType type) const { 188 for (SmallVectorImpl<AttributeList*>::const_iterator 189 i = ignoredTypeAttrs.begin(), e = ignoredTypeAttrs.end(); 190 i != e; ++i) 191 diagnoseBadTypeAttribute(getSema(), **i, type); 192 } 193 194 ~TypeProcessingState() { 195 if (trivial) return; 196 197 restoreDeclSpecAttrs(); 198 } 199 200 private: 201 DeclSpec &getMutableDeclSpec() const { 202 return const_cast<DeclSpec&>(declarator.getDeclSpec()); 203 } 204 205 void restoreDeclSpecAttrs() { 206 assert(hasSavedAttrs); 207 208 if (savedAttrs.empty()) { 209 getMutableDeclSpec().getAttributes().set(0); 210 return; 211 } 212 213 getMutableDeclSpec().getAttributes().set(savedAttrs[0]); 214 for (unsigned i = 0, e = savedAttrs.size() - 1; i != e; ++i) 215 savedAttrs[i]->setNext(savedAttrs[i+1]); 216 savedAttrs.back()->setNext(0); 217 } 218 }; 219 220 /// Basically std::pair except that we really want to avoid an 221 /// implicit operator= for safety concerns. It's also a minor 222 /// link-time optimization for this to be a private type. 223 struct AttrAndList { 224 /// The attribute. 225 AttributeList &first; 226 227 /// The head of the list the attribute is currently in. 228 AttributeList *&second; 229 230 AttrAndList(AttributeList &attr, AttributeList *&head) 231 : first(attr), second(head) {} 232 }; 233} 234 235namespace llvm { 236 template <> struct isPodLike<AttrAndList> { 237 static const bool value = true; 238 }; 239} 240 241static void spliceAttrIntoList(AttributeList &attr, AttributeList *&head) { 242 attr.setNext(head); 243 head = &attr; 244} 245 246static void spliceAttrOutOfList(AttributeList &attr, AttributeList *&head) { 247 if (head == &attr) { 248 head = attr.getNext(); 249 return; 250 } 251 252 AttributeList *cur = head; 253 while (true) { 254 assert(cur && cur->getNext() && "ran out of attrs?"); 255 if (cur->getNext() == &attr) { 256 cur->setNext(attr.getNext()); 257 return; 258 } 259 cur = cur->getNext(); 260 } 261} 262 263static void moveAttrFromListToList(AttributeList &attr, 264 AttributeList *&fromList, 265 AttributeList *&toList) { 266 spliceAttrOutOfList(attr, fromList); 267 spliceAttrIntoList(attr, toList); 268} 269 270static void processTypeAttrs(TypeProcessingState &state, 271 QualType &type, bool isDeclSpec, 272 AttributeList *attrs); 273 274static bool handleFunctionTypeAttr(TypeProcessingState &state, 275 AttributeList &attr, 276 QualType &type); 277 278static bool handleObjCGCTypeAttr(TypeProcessingState &state, 279 AttributeList &attr, QualType &type); 280 281static bool handleObjCOwnershipTypeAttr(TypeProcessingState &state, 282 AttributeList &attr, QualType &type); 283 284static bool handleObjCPointerTypeAttr(TypeProcessingState &state, 285 AttributeList &attr, QualType &type) { 286 if (attr.getKind() == AttributeList::AT_objc_gc) 287 return handleObjCGCTypeAttr(state, attr, type); 288 assert(attr.getKind() == AttributeList::AT_objc_ownership); 289 return handleObjCOwnershipTypeAttr(state, attr, type); 290} 291 292/// Given that an objc_gc attribute was written somewhere on a 293/// declaration *other* than on the declarator itself (for which, use 294/// distributeObjCPointerTypeAttrFromDeclarator), and given that it 295/// didn't apply in whatever position it was written in, try to move 296/// it to a more appropriate position. 297static void distributeObjCPointerTypeAttr(TypeProcessingState &state, 298 AttributeList &attr, 299 QualType type) { 300 Declarator &declarator = state.getDeclarator(); 301 for (unsigned i = state.getCurrentChunkIndex(); i != 0; --i) { 302 DeclaratorChunk &chunk = declarator.getTypeObject(i-1); 303 switch (chunk.Kind) { 304 case DeclaratorChunk::Pointer: 305 case DeclaratorChunk::BlockPointer: 306 moveAttrFromListToList(attr, state.getCurrentAttrListRef(), 307 chunk.getAttrListRef()); 308 return; 309 310 case DeclaratorChunk::Paren: 311 case DeclaratorChunk::Array: 312 continue; 313 314 // Don't walk through these. 315 case DeclaratorChunk::Reference: 316 case DeclaratorChunk::Function: 317 case DeclaratorChunk::MemberPointer: 318 goto error; 319 } 320 } 321 error: 322 323 diagnoseBadTypeAttribute(state.getSema(), attr, type); 324} 325 326/// Distribute an objc_gc type attribute that was written on the 327/// declarator. 328static void 329distributeObjCPointerTypeAttrFromDeclarator(TypeProcessingState &state, 330 AttributeList &attr, 331 QualType &declSpecType) { 332 Declarator &declarator = state.getDeclarator(); 333 334 // objc_gc goes on the innermost pointer to something that's not a 335 // pointer. 336 unsigned innermost = -1U; 337 bool considerDeclSpec = true; 338 for (unsigned i = 0, e = declarator.getNumTypeObjects(); i != e; ++i) { 339 DeclaratorChunk &chunk = declarator.getTypeObject(i); 340 switch (chunk.Kind) { 341 case DeclaratorChunk::Pointer: 342 case DeclaratorChunk::BlockPointer: 343 innermost = i; 344 continue; 345 346 case DeclaratorChunk::Reference: 347 case DeclaratorChunk::MemberPointer: 348 case DeclaratorChunk::Paren: 349 case DeclaratorChunk::Array: 350 continue; 351 352 case DeclaratorChunk::Function: 353 considerDeclSpec = false; 354 goto done; 355 } 356 } 357 done: 358 359 // That might actually be the decl spec if we weren't blocked by 360 // anything in the declarator. 361 if (considerDeclSpec) { 362 if (handleObjCPointerTypeAttr(state, attr, declSpecType)) { 363 // Splice the attribute into the decl spec. Prevents the 364 // attribute from being applied multiple times and gives 365 // the source-location-filler something to work with. 366 state.saveDeclSpecAttrs(); 367 moveAttrFromListToList(attr, declarator.getAttrListRef(), 368 declarator.getMutableDeclSpec().getAttributes().getListRef()); 369 return; 370 } 371 } 372 373 // Otherwise, if we found an appropriate chunk, splice the attribute 374 // into it. 375 if (innermost != -1U) { 376 moveAttrFromListToList(attr, declarator.getAttrListRef(), 377 declarator.getTypeObject(innermost).getAttrListRef()); 378 return; 379 } 380 381 // Otherwise, diagnose when we're done building the type. 382 spliceAttrOutOfList(attr, declarator.getAttrListRef()); 383 state.addIgnoredTypeAttr(attr); 384} 385 386/// A function type attribute was written somewhere in a declaration 387/// *other* than on the declarator itself or in the decl spec. Given 388/// that it didn't apply in whatever position it was written in, try 389/// to move it to a more appropriate position. 390static void distributeFunctionTypeAttr(TypeProcessingState &state, 391 AttributeList &attr, 392 QualType type) { 393 Declarator &declarator = state.getDeclarator(); 394 395 // Try to push the attribute from the return type of a function to 396 // the function itself. 397 for (unsigned i = state.getCurrentChunkIndex(); i != 0; --i) { 398 DeclaratorChunk &chunk = declarator.getTypeObject(i-1); 399 switch (chunk.Kind) { 400 case DeclaratorChunk::Function: 401 moveAttrFromListToList(attr, state.getCurrentAttrListRef(), 402 chunk.getAttrListRef()); 403 return; 404 405 case DeclaratorChunk::Paren: 406 case DeclaratorChunk::Pointer: 407 case DeclaratorChunk::BlockPointer: 408 case DeclaratorChunk::Array: 409 case DeclaratorChunk::Reference: 410 case DeclaratorChunk::MemberPointer: 411 continue; 412 } 413 } 414 415 diagnoseBadTypeAttribute(state.getSema(), attr, type); 416} 417 418/// Try to distribute a function type attribute to the innermost 419/// function chunk or type. Returns true if the attribute was 420/// distributed, false if no location was found. 421static bool 422distributeFunctionTypeAttrToInnermost(TypeProcessingState &state, 423 AttributeList &attr, 424 AttributeList *&attrList, 425 QualType &declSpecType) { 426 Declarator &declarator = state.getDeclarator(); 427 428 // Put it on the innermost function chunk, if there is one. 429 for (unsigned i = 0, e = declarator.getNumTypeObjects(); i != e; ++i) { 430 DeclaratorChunk &chunk = declarator.getTypeObject(i); 431 if (chunk.Kind != DeclaratorChunk::Function) continue; 432 433 moveAttrFromListToList(attr, attrList, chunk.getAttrListRef()); 434 return true; 435 } 436 437 if (handleFunctionTypeAttr(state, attr, declSpecType)) { 438 spliceAttrOutOfList(attr, attrList); 439 return true; 440 } 441 442 return false; 443} 444 445/// A function type attribute was written in the decl spec. Try to 446/// apply it somewhere. 447static void 448distributeFunctionTypeAttrFromDeclSpec(TypeProcessingState &state, 449 AttributeList &attr, 450 QualType &declSpecType) { 451 state.saveDeclSpecAttrs(); 452 453 // Try to distribute to the innermost. 454 if (distributeFunctionTypeAttrToInnermost(state, attr, 455 state.getCurrentAttrListRef(), 456 declSpecType)) 457 return; 458 459 // If that failed, diagnose the bad attribute when the declarator is 460 // fully built. 461 state.addIgnoredTypeAttr(attr); 462} 463 464/// A function type attribute was written on the declarator. Try to 465/// apply it somewhere. 466static void 467distributeFunctionTypeAttrFromDeclarator(TypeProcessingState &state, 468 AttributeList &attr, 469 QualType &declSpecType) { 470 Declarator &declarator = state.getDeclarator(); 471 472 // Try to distribute to the innermost. 473 if (distributeFunctionTypeAttrToInnermost(state, attr, 474 declarator.getAttrListRef(), 475 declSpecType)) 476 return; 477 478 // If that failed, diagnose the bad attribute when the declarator is 479 // fully built. 480 spliceAttrOutOfList(attr, declarator.getAttrListRef()); 481 state.addIgnoredTypeAttr(attr); 482} 483 484/// \brief Given that there are attributes written on the declarator 485/// itself, try to distribute any type attributes to the appropriate 486/// declarator chunk. 487/// 488/// These are attributes like the following: 489/// int f ATTR; 490/// int (f ATTR)(); 491/// but not necessarily this: 492/// int f() ATTR; 493static void distributeTypeAttrsFromDeclarator(TypeProcessingState &state, 494 QualType &declSpecType) { 495 // Collect all the type attributes from the declarator itself. 496 assert(state.getDeclarator().getAttributes() && "declarator has no attrs!"); 497 AttributeList *attr = state.getDeclarator().getAttributes(); 498 AttributeList *next; 499 do { 500 next = attr->getNext(); 501 502 switch (attr->getKind()) { 503 OBJC_POINTER_TYPE_ATTRS_CASELIST: 504 distributeObjCPointerTypeAttrFromDeclarator(state, *attr, declSpecType); 505 break; 506 507 case AttributeList::AT_ns_returns_retained: 508 if (!state.getSema().getLangOptions().ObjCAutoRefCount) 509 break; 510 // fallthrough 511 512 FUNCTION_TYPE_ATTRS_CASELIST: 513 distributeFunctionTypeAttrFromDeclarator(state, *attr, declSpecType); 514 break; 515 516 default: 517 break; 518 } 519 } while ((attr = next)); 520} 521 522/// Add a synthetic '()' to a block-literal declarator if it is 523/// required, given the return type. 524static void maybeSynthesizeBlockSignature(TypeProcessingState &state, 525 QualType declSpecType) { 526 Declarator &declarator = state.getDeclarator(); 527 528 // First, check whether the declarator would produce a function, 529 // i.e. whether the innermost semantic chunk is a function. 530 if (declarator.isFunctionDeclarator()) { 531 // If so, make that declarator a prototyped declarator. 532 declarator.getFunctionTypeInfo().hasPrototype = true; 533 return; 534 } 535 536 // If there are any type objects, the type as written won't name a 537 // function, regardless of the decl spec type. This is because a 538 // block signature declarator is always an abstract-declarator, and 539 // abstract-declarators can't just be parentheses chunks. Therefore 540 // we need to build a function chunk unless there are no type 541 // objects and the decl spec type is a function. 542 if (!declarator.getNumTypeObjects() && declSpecType->isFunctionType()) 543 return; 544 545 // Note that there *are* cases with invalid declarators where 546 // declarators consist solely of parentheses. In general, these 547 // occur only in failed efforts to make function declarators, so 548 // faking up the function chunk is still the right thing to do. 549 550 // Otherwise, we need to fake up a function declarator. 551 SourceLocation loc = declarator.getSourceRange().getBegin(); 552 553 // ...and *prepend* it to the declarator. 554 declarator.AddInnermostTypeInfo(DeclaratorChunk::getFunction( 555 /*proto*/ true, 556 /*variadic*/ false, SourceLocation(), 557 /*args*/ 0, 0, 558 /*type quals*/ 0, 559 /*ref-qualifier*/true, SourceLocation(), 560 /*const qualifier*/SourceLocation(), 561 /*volatile qualifier*/SourceLocation(), 562 /*mutable qualifier*/SourceLocation(), 563 /*EH*/ EST_None, SourceLocation(), 0, 0, 0, 0, 564 /*parens*/ loc, loc, 565 declarator)); 566 567 // For consistency, make sure the state still has us as processing 568 // the decl spec. 569 assert(state.getCurrentChunkIndex() == declarator.getNumTypeObjects() - 1); 570 state.setCurrentChunkIndex(declarator.getNumTypeObjects()); 571} 572 573/// \brief Convert the specified declspec to the appropriate type 574/// object. 575/// \param D the declarator containing the declaration specifier. 576/// \returns The type described by the declaration specifiers. This function 577/// never returns null. 578static QualType ConvertDeclSpecToType(TypeProcessingState &state) { 579 // FIXME: Should move the logic from DeclSpec::Finish to here for validity 580 // checking. 581 582 Sema &S = state.getSema(); 583 Declarator &declarator = state.getDeclarator(); 584 const DeclSpec &DS = declarator.getDeclSpec(); 585 SourceLocation DeclLoc = declarator.getIdentifierLoc(); 586 if (DeclLoc.isInvalid()) 587 DeclLoc = DS.getSourceRange().getBegin(); 588 589 ASTContext &Context = S.Context; 590 591 QualType Result; 592 switch (DS.getTypeSpecType()) { 593 case DeclSpec::TST_void: 594 Result = Context.VoidTy; 595 break; 596 case DeclSpec::TST_char: 597 if (DS.getTypeSpecSign() == DeclSpec::TSS_unspecified) 598 Result = Context.CharTy; 599 else if (DS.getTypeSpecSign() == DeclSpec::TSS_signed) 600 Result = Context.SignedCharTy; 601 else { 602 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unsigned && 603 "Unknown TSS value"); 604 Result = Context.UnsignedCharTy; 605 } 606 break; 607 case DeclSpec::TST_wchar: 608 if (DS.getTypeSpecSign() == DeclSpec::TSS_unspecified) 609 Result = Context.WCharTy; 610 else if (DS.getTypeSpecSign() == DeclSpec::TSS_signed) { 611 S.Diag(DS.getTypeSpecSignLoc(), diag::ext_invalid_sign_spec) 612 << DS.getSpecifierName(DS.getTypeSpecType()); 613 Result = Context.getSignedWCharType(); 614 } else { 615 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unsigned && 616 "Unknown TSS value"); 617 S.Diag(DS.getTypeSpecSignLoc(), diag::ext_invalid_sign_spec) 618 << DS.getSpecifierName(DS.getTypeSpecType()); 619 Result = Context.getUnsignedWCharType(); 620 } 621 break; 622 case DeclSpec::TST_char16: 623 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unspecified && 624 "Unknown TSS value"); 625 Result = Context.Char16Ty; 626 break; 627 case DeclSpec::TST_char32: 628 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unspecified && 629 "Unknown TSS value"); 630 Result = Context.Char32Ty; 631 break; 632 case DeclSpec::TST_unspecified: 633 // "<proto1,proto2>" is an objc qualified ID with a missing id. 634 if (DeclSpec::ProtocolQualifierListTy PQ = DS.getProtocolQualifiers()) { 635 Result = Context.getObjCObjectType(Context.ObjCBuiltinIdTy, 636 (ObjCProtocolDecl**)PQ, 637 DS.getNumProtocolQualifiers()); 638 Result = Context.getObjCObjectPointerType(Result); 639 break; 640 } 641 642 // If this is a missing declspec in a block literal return context, then it 643 // is inferred from the return statements inside the block. 644 // The declspec is always missing in a lambda expr context; it is either 645 // specified with a trailing return type or inferred. 646 if (declarator.getContext() == Declarator::LambdaExprContext || 647 isOmittedBlockReturnType(declarator)) { 648 Result = Context.DependentTy; 649 break; 650 } 651 652 // Unspecified typespec defaults to int in C90. However, the C90 grammar 653 // [C90 6.5] only allows a decl-spec if there was *some* type-specifier, 654 // type-qualifier, or storage-class-specifier. If not, emit an extwarn. 655 // Note that the one exception to this is function definitions, which are 656 // allowed to be completely missing a declspec. This is handled in the 657 // parser already though by it pretending to have seen an 'int' in this 658 // case. 659 if (S.getLangOptions().ImplicitInt) { 660 // In C89 mode, we only warn if there is a completely missing declspec 661 // when one is not allowed. 662 if (DS.isEmpty()) { 663 S.Diag(DeclLoc, diag::ext_missing_declspec) 664 << DS.getSourceRange() 665 << FixItHint::CreateInsertion(DS.getSourceRange().getBegin(), "int"); 666 } 667 } else if (!DS.hasTypeSpecifier()) { 668 // C99 and C++ require a type specifier. For example, C99 6.7.2p2 says: 669 // "At least one type specifier shall be given in the declaration 670 // specifiers in each declaration, and in the specifier-qualifier list in 671 // each struct declaration and type name." 672 // FIXME: Does Microsoft really have the implicit int extension in C++? 673 if (S.getLangOptions().CPlusPlus && 674 !S.getLangOptions().MicrosoftExt) { 675 S.Diag(DeclLoc, diag::err_missing_type_specifier) 676 << DS.getSourceRange(); 677 678 // When this occurs in C++ code, often something is very broken with the 679 // value being declared, poison it as invalid so we don't get chains of 680 // errors. 681 declarator.setInvalidType(true); 682 } else { 683 S.Diag(DeclLoc, diag::ext_missing_type_specifier) 684 << DS.getSourceRange(); 685 } 686 } 687 688 // FALL THROUGH. 689 case DeclSpec::TST_int: { 690 if (DS.getTypeSpecSign() != DeclSpec::TSS_unsigned) { 691 switch (DS.getTypeSpecWidth()) { 692 case DeclSpec::TSW_unspecified: Result = Context.IntTy; break; 693 case DeclSpec::TSW_short: Result = Context.ShortTy; break; 694 case DeclSpec::TSW_long: Result = Context.LongTy; break; 695 case DeclSpec::TSW_longlong: 696 Result = Context.LongLongTy; 697 698 // long long is a C99 feature. 699 if (!S.getLangOptions().C99) 700 S.Diag(DS.getTypeSpecWidthLoc(), 701 S.getLangOptions().CPlusPlus0x ? 702 diag::warn_cxx98_compat_longlong : diag::ext_longlong); 703 break; 704 } 705 } else { 706 switch (DS.getTypeSpecWidth()) { 707 case DeclSpec::TSW_unspecified: Result = Context.UnsignedIntTy; break; 708 case DeclSpec::TSW_short: Result = Context.UnsignedShortTy; break; 709 case DeclSpec::TSW_long: Result = Context.UnsignedLongTy; break; 710 case DeclSpec::TSW_longlong: 711 Result = Context.UnsignedLongLongTy; 712 713 // long long is a C99 feature. 714 if (!S.getLangOptions().C99) 715 S.Diag(DS.getTypeSpecWidthLoc(), 716 S.getLangOptions().CPlusPlus0x ? 717 diag::warn_cxx98_compat_longlong : diag::ext_longlong); 718 break; 719 } 720 } 721 break; 722 } 723 case DeclSpec::TST_half: Result = Context.HalfTy; break; 724 case DeclSpec::TST_float: Result = Context.FloatTy; break; 725 case DeclSpec::TST_double: 726 if (DS.getTypeSpecWidth() == DeclSpec::TSW_long) 727 Result = Context.LongDoubleTy; 728 else 729 Result = Context.DoubleTy; 730 731 if (S.getLangOptions().OpenCL && !S.getOpenCLOptions().cl_khr_fp64) { 732 S.Diag(DS.getTypeSpecTypeLoc(), diag::err_double_requires_fp64); 733 declarator.setInvalidType(true); 734 } 735 break; 736 case DeclSpec::TST_bool: Result = Context.BoolTy; break; // _Bool or bool 737 case DeclSpec::TST_decimal32: // _Decimal32 738 case DeclSpec::TST_decimal64: // _Decimal64 739 case DeclSpec::TST_decimal128: // _Decimal128 740 S.Diag(DS.getTypeSpecTypeLoc(), diag::err_decimal_unsupported); 741 Result = Context.IntTy; 742 declarator.setInvalidType(true); 743 break; 744 case DeclSpec::TST_class: 745 case DeclSpec::TST_enum: 746 case DeclSpec::TST_union: 747 case DeclSpec::TST_struct: { 748 TypeDecl *D = dyn_cast_or_null<TypeDecl>(DS.getRepAsDecl()); 749 if (!D) { 750 // This can happen in C++ with ambiguous lookups. 751 Result = Context.IntTy; 752 declarator.setInvalidType(true); 753 break; 754 } 755 756 // If the type is deprecated or unavailable, diagnose it. 757 S.DiagnoseUseOfDecl(D, DS.getTypeSpecTypeNameLoc()); 758 759 assert(DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 && 760 DS.getTypeSpecSign() == 0 && "No qualifiers on tag names!"); 761 762 // TypeQuals handled by caller. 763 Result = Context.getTypeDeclType(D); 764 765 // In both C and C++, make an ElaboratedType. 766 ElaboratedTypeKeyword Keyword 767 = ElaboratedType::getKeywordForTypeSpec(DS.getTypeSpecType()); 768 Result = S.getElaboratedType(Keyword, DS.getTypeSpecScope(), Result); 769 770 if (D->isInvalidDecl()) 771 declarator.setInvalidType(true); 772 break; 773 } 774 case DeclSpec::TST_typename: { 775 assert(DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 && 776 DS.getTypeSpecSign() == 0 && 777 "Can't handle qualifiers on typedef names yet!"); 778 Result = S.GetTypeFromParser(DS.getRepAsType()); 779 if (Result.isNull()) 780 declarator.setInvalidType(true); 781 else if (DeclSpec::ProtocolQualifierListTy PQ 782 = DS.getProtocolQualifiers()) { 783 if (const ObjCObjectType *ObjT = Result->getAs<ObjCObjectType>()) { 784 // Silently drop any existing protocol qualifiers. 785 // TODO: determine whether that's the right thing to do. 786 if (ObjT->getNumProtocols()) 787 Result = ObjT->getBaseType(); 788 789 if (DS.getNumProtocolQualifiers()) 790 Result = Context.getObjCObjectType(Result, 791 (ObjCProtocolDecl**) PQ, 792 DS.getNumProtocolQualifiers()); 793 } else if (Result->isObjCIdType()) { 794 // id<protocol-list> 795 Result = Context.getObjCObjectType(Context.ObjCBuiltinIdTy, 796 (ObjCProtocolDecl**) PQ, 797 DS.getNumProtocolQualifiers()); 798 Result = Context.getObjCObjectPointerType(Result); 799 } else if (Result->isObjCClassType()) { 800 // Class<protocol-list> 801 Result = Context.getObjCObjectType(Context.ObjCBuiltinClassTy, 802 (ObjCProtocolDecl**) PQ, 803 DS.getNumProtocolQualifiers()); 804 Result = Context.getObjCObjectPointerType(Result); 805 } else { 806 S.Diag(DeclLoc, diag::err_invalid_protocol_qualifiers) 807 << DS.getSourceRange(); 808 declarator.setInvalidType(true); 809 } 810 } 811 812 // TypeQuals handled by caller. 813 break; 814 } 815 case DeclSpec::TST_typeofType: 816 // FIXME: Preserve type source info. 817 Result = S.GetTypeFromParser(DS.getRepAsType()); 818 assert(!Result.isNull() && "Didn't get a type for typeof?"); 819 if (!Result->isDependentType()) 820 if (const TagType *TT = Result->getAs<TagType>()) 821 S.DiagnoseUseOfDecl(TT->getDecl(), DS.getTypeSpecTypeLoc()); 822 // TypeQuals handled by caller. 823 Result = Context.getTypeOfType(Result); 824 break; 825 case DeclSpec::TST_typeofExpr: { 826 Expr *E = DS.getRepAsExpr(); 827 assert(E && "Didn't get an expression for typeof?"); 828 // TypeQuals handled by caller. 829 Result = S.BuildTypeofExprType(E, DS.getTypeSpecTypeLoc()); 830 if (Result.isNull()) { 831 Result = Context.IntTy; 832 declarator.setInvalidType(true); 833 } 834 break; 835 } 836 case DeclSpec::TST_decltype: { 837 Expr *E = DS.getRepAsExpr(); 838 assert(E && "Didn't get an expression for decltype?"); 839 // TypeQuals handled by caller. 840 Result = S.BuildDecltypeType(E, DS.getTypeSpecTypeLoc()); 841 if (Result.isNull()) { 842 Result = Context.IntTy; 843 declarator.setInvalidType(true); 844 } 845 break; 846 } 847 case DeclSpec::TST_underlyingType: 848 Result = S.GetTypeFromParser(DS.getRepAsType()); 849 assert(!Result.isNull() && "Didn't get a type for __underlying_type?"); 850 Result = S.BuildUnaryTransformType(Result, 851 UnaryTransformType::EnumUnderlyingType, 852 DS.getTypeSpecTypeLoc()); 853 if (Result.isNull()) { 854 Result = Context.IntTy; 855 declarator.setInvalidType(true); 856 } 857 break; 858 859 case DeclSpec::TST_auto: { 860 // TypeQuals handled by caller. 861 Result = Context.getAutoType(QualType()); 862 break; 863 } 864 865 case DeclSpec::TST_unknown_anytype: 866 Result = Context.UnknownAnyTy; 867 break; 868 869 case DeclSpec::TST_atomic: 870 Result = S.GetTypeFromParser(DS.getRepAsType()); 871 assert(!Result.isNull() && "Didn't get a type for _Atomic?"); 872 Result = S.BuildAtomicType(Result, DS.getTypeSpecTypeLoc()); 873 if (Result.isNull()) { 874 Result = Context.IntTy; 875 declarator.setInvalidType(true); 876 } 877 break; 878 879 case DeclSpec::TST_error: 880 Result = Context.IntTy; 881 declarator.setInvalidType(true); 882 break; 883 } 884 885 // Handle complex types. 886 if (DS.getTypeSpecComplex() == DeclSpec::TSC_complex) { 887 if (S.getLangOptions().Freestanding) 888 S.Diag(DS.getTypeSpecComplexLoc(), diag::ext_freestanding_complex); 889 Result = Context.getComplexType(Result); 890 } else if (DS.isTypeAltiVecVector()) { 891 unsigned typeSize = static_cast<unsigned>(Context.getTypeSize(Result)); 892 assert(typeSize > 0 && "type size for vector must be greater than 0 bits"); 893 VectorType::VectorKind VecKind = VectorType::AltiVecVector; 894 if (DS.isTypeAltiVecPixel()) 895 VecKind = VectorType::AltiVecPixel; 896 else if (DS.isTypeAltiVecBool()) 897 VecKind = VectorType::AltiVecBool; 898 Result = Context.getVectorType(Result, 128/typeSize, VecKind); 899 } 900 901 // FIXME: Imaginary. 902 if (DS.getTypeSpecComplex() == DeclSpec::TSC_imaginary) 903 S.Diag(DS.getTypeSpecComplexLoc(), diag::err_imaginary_not_supported); 904 905 // Before we process any type attributes, synthesize a block literal 906 // function declarator if necessary. 907 if (declarator.getContext() == Declarator::BlockLiteralContext) 908 maybeSynthesizeBlockSignature(state, Result); 909 910 // Apply any type attributes from the decl spec. This may cause the 911 // list of type attributes to be temporarily saved while the type 912 // attributes are pushed around. 913 if (AttributeList *attrs = DS.getAttributes().getList()) 914 processTypeAttrs(state, Result, true, attrs); 915 916 // Apply const/volatile/restrict qualifiers to T. 917 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 918 919 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 920 // or incomplete types shall not be restrict-qualified." C++ also allows 921 // restrict-qualified references. 922 if (TypeQuals & DeclSpec::TQ_restrict) { 923 if (Result->isAnyPointerType() || Result->isReferenceType()) { 924 QualType EltTy; 925 if (Result->isObjCObjectPointerType()) 926 EltTy = Result; 927 else 928 EltTy = Result->isPointerType() ? 929 Result->getAs<PointerType>()->getPointeeType() : 930 Result->getAs<ReferenceType>()->getPointeeType(); 931 932 // If we have a pointer or reference, the pointee must have an object 933 // incomplete type. 934 if (!EltTy->isIncompleteOrObjectType()) { 935 S.Diag(DS.getRestrictSpecLoc(), 936 diag::err_typecheck_invalid_restrict_invalid_pointee) 937 << EltTy << DS.getSourceRange(); 938 TypeQuals &= ~DeclSpec::TQ_restrict; // Remove the restrict qualifier. 939 } 940 } else { 941 S.Diag(DS.getRestrictSpecLoc(), 942 diag::err_typecheck_invalid_restrict_not_pointer) 943 << Result << DS.getSourceRange(); 944 TypeQuals &= ~DeclSpec::TQ_restrict; // Remove the restrict qualifier. 945 } 946 } 947 948 // Warn about CV qualifiers on functions: C99 6.7.3p8: "If the specification 949 // of a function type includes any type qualifiers, the behavior is 950 // undefined." 951 if (Result->isFunctionType() && TypeQuals) { 952 // Get some location to point at, either the C or V location. 953 SourceLocation Loc; 954 if (TypeQuals & DeclSpec::TQ_const) 955 Loc = DS.getConstSpecLoc(); 956 else if (TypeQuals & DeclSpec::TQ_volatile) 957 Loc = DS.getVolatileSpecLoc(); 958 else { 959 assert((TypeQuals & DeclSpec::TQ_restrict) && 960 "Has CVR quals but not C, V, or R?"); 961 Loc = DS.getRestrictSpecLoc(); 962 } 963 S.Diag(Loc, diag::warn_typecheck_function_qualifiers) 964 << Result << DS.getSourceRange(); 965 } 966 967 // C++ [dcl.ref]p1: 968 // Cv-qualified references are ill-formed except when the 969 // cv-qualifiers are introduced through the use of a typedef 970 // (7.1.3) or of a template type argument (14.3), in which 971 // case the cv-qualifiers are ignored. 972 // FIXME: Shouldn't we be checking SCS_typedef here? 973 if (DS.getTypeSpecType() == DeclSpec::TST_typename && 974 TypeQuals && Result->isReferenceType()) { 975 TypeQuals &= ~DeclSpec::TQ_const; 976 TypeQuals &= ~DeclSpec::TQ_volatile; 977 } 978 979 Qualifiers Quals = Qualifiers::fromCVRMask(TypeQuals); 980 Result = Context.getQualifiedType(Result, Quals); 981 } 982 983 return Result; 984} 985 986static std::string getPrintableNameForEntity(DeclarationName Entity) { 987 if (Entity) 988 return Entity.getAsString(); 989 990 return "type name"; 991} 992 993QualType Sema::BuildQualifiedType(QualType T, SourceLocation Loc, 994 Qualifiers Qs) { 995 // Enforce C99 6.7.3p2: "Types other than pointer types derived from 996 // object or incomplete types shall not be restrict-qualified." 997 if (Qs.hasRestrict()) { 998 unsigned DiagID = 0; 999 QualType ProblemTy; 1000 1001 const Type *Ty = T->getCanonicalTypeInternal().getTypePtr(); 1002 if (const ReferenceType *RTy = dyn_cast<ReferenceType>(Ty)) { 1003 if (!RTy->getPointeeType()->isIncompleteOrObjectType()) { 1004 DiagID = diag::err_typecheck_invalid_restrict_invalid_pointee; 1005 ProblemTy = T->getAs<ReferenceType>()->getPointeeType(); 1006 } 1007 } else if (const PointerType *PTy = dyn_cast<PointerType>(Ty)) { 1008 if (!PTy->getPointeeType()->isIncompleteOrObjectType()) { 1009 DiagID = diag::err_typecheck_invalid_restrict_invalid_pointee; 1010 ProblemTy = T->getAs<PointerType>()->getPointeeType(); 1011 } 1012 } else if (const MemberPointerType *PTy = dyn_cast<MemberPointerType>(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 (!Ty->isDependentType()) { 1018 // FIXME: this deserves a proper diagnostic 1019 DiagID = diag::err_typecheck_invalid_restrict_invalid_pointee; 1020 ProblemTy = T; 1021 } 1022 1023 if (DiagID) { 1024 Diag(Loc, DiagID) << ProblemTy; 1025 Qs.removeRestrict(); 1026 } 1027 } 1028 1029 return Context.getQualifiedType(T, Qs); 1030} 1031 1032/// \brief Build a paren type including \p T. 1033QualType Sema::BuildParenType(QualType T) { 1034 return Context.getParenType(T); 1035} 1036 1037/// Given that we're building a pointer or reference to the given 1038static QualType inferARCLifetimeForPointee(Sema &S, QualType type, 1039 SourceLocation loc, 1040 bool isReference) { 1041 // Bail out if retention is unrequired or already specified. 1042 if (!type->isObjCLifetimeType() || 1043 type.getObjCLifetime() != Qualifiers::OCL_None) 1044 return type; 1045 1046 Qualifiers::ObjCLifetime implicitLifetime = Qualifiers::OCL_None; 1047 1048 // If the object type is const-qualified, we can safely use 1049 // __unsafe_unretained. This is safe (because there are no read 1050 // barriers), and it'll be safe to coerce anything but __weak* to 1051 // the resulting type. 1052 if (type.isConstQualified()) { 1053 implicitLifetime = Qualifiers::OCL_ExplicitNone; 1054 1055 // Otherwise, check whether the static type does not require 1056 // retaining. This currently only triggers for Class (possibly 1057 // protocol-qualifed, and arrays thereof). 1058 } else if (type->isObjCARCImplicitlyUnretainedType()) { 1059 implicitLifetime = Qualifiers::OCL_ExplicitNone; 1060 1061 // If we are in an unevaluated context, like sizeof, skip adding a 1062 // qualification. 1063 } else if (S.ExprEvalContexts.back().Context == Sema::Unevaluated) { 1064 return type; 1065 1066 // If that failed, give an error and recover using __strong. __strong 1067 // is the option most likely to prevent spurious second-order diagnostics, 1068 // like when binding a reference to a field. 1069 } else { 1070 // These types can show up in private ivars in system headers, so 1071 // we need this to not be an error in those cases. Instead we 1072 // want to delay. 1073 if (S.DelayedDiagnostics.shouldDelayDiagnostics()) { 1074 S.DelayedDiagnostics.add( 1075 sema::DelayedDiagnostic::makeForbiddenType(loc, 1076 diag::err_arc_indirect_no_ownership, type, isReference)); 1077 } else { 1078 S.Diag(loc, diag::err_arc_indirect_no_ownership) << type << isReference; 1079 } 1080 implicitLifetime = Qualifiers::OCL_Strong; 1081 } 1082 assert(implicitLifetime && "didn't infer any lifetime!"); 1083 1084 Qualifiers qs; 1085 qs.addObjCLifetime(implicitLifetime); 1086 return S.Context.getQualifiedType(type, qs); 1087} 1088 1089/// \brief Build a pointer type. 1090/// 1091/// \param T The type to which we'll be building a pointer. 1092/// 1093/// \param Loc The location of the entity whose type involves this 1094/// pointer type or, if there is no such entity, the location of the 1095/// type that will have pointer type. 1096/// 1097/// \param Entity The name of the entity that involves the pointer 1098/// type, if known. 1099/// 1100/// \returns A suitable pointer type, if there are no 1101/// errors. Otherwise, returns a NULL type. 1102QualType Sema::BuildPointerType(QualType T, 1103 SourceLocation Loc, DeclarationName Entity) { 1104 if (T->isReferenceType()) { 1105 // C++ 8.3.2p4: There shall be no ... pointers to references ... 1106 Diag(Loc, diag::err_illegal_decl_pointer_to_reference) 1107 << getPrintableNameForEntity(Entity) << T; 1108 return QualType(); 1109 } 1110 1111 assert(!T->isObjCObjectType() && "Should build ObjCObjectPointerType"); 1112 1113 // In ARC, it is forbidden to build pointers to unqualified pointers. 1114 if (getLangOptions().ObjCAutoRefCount) 1115 T = inferARCLifetimeForPointee(*this, T, Loc, /*reference*/ false); 1116 1117 // Build the pointer type. 1118 return Context.getPointerType(T); 1119} 1120 1121/// \brief Build a reference type. 1122/// 1123/// \param T The type to which we'll be building a reference. 1124/// 1125/// \param Loc The location of the entity whose type involves this 1126/// reference type or, if there is no such entity, the location of the 1127/// type that will have reference type. 1128/// 1129/// \param Entity The name of the entity that involves the reference 1130/// type, if known. 1131/// 1132/// \returns A suitable reference type, if there are no 1133/// errors. Otherwise, returns a NULL type. 1134QualType Sema::BuildReferenceType(QualType T, bool SpelledAsLValue, 1135 SourceLocation Loc, 1136 DeclarationName Entity) { 1137 assert(Context.getCanonicalType(T) != Context.OverloadTy && 1138 "Unresolved overloaded function type"); 1139 1140 // C++0x [dcl.ref]p6: 1141 // If a typedef (7.1.3), a type template-parameter (14.3.1), or a 1142 // decltype-specifier (7.1.6.2) denotes a type TR that is a reference to a 1143 // type T, an attempt to create the type "lvalue reference to cv TR" creates 1144 // the type "lvalue reference to T", while an attempt to create the type 1145 // "rvalue reference to cv TR" creates the type TR. 1146 bool LValueRef = SpelledAsLValue || T->getAs<LValueReferenceType>(); 1147 1148 // C++ [dcl.ref]p4: There shall be no references to references. 1149 // 1150 // According to C++ DR 106, references to references are only 1151 // diagnosed when they are written directly (e.g., "int & &"), 1152 // but not when they happen via a typedef: 1153 // 1154 // typedef int& intref; 1155 // typedef intref& intref2; 1156 // 1157 // Parser::ParseDeclaratorInternal diagnoses the case where 1158 // references are written directly; here, we handle the 1159 // collapsing of references-to-references as described in C++0x. 1160 // DR 106 and 540 introduce reference-collapsing into C++98/03. 1161 1162 // C++ [dcl.ref]p1: 1163 // A declarator that specifies the type "reference to cv void" 1164 // is ill-formed. 1165 if (T->isVoidType()) { 1166 Diag(Loc, diag::err_reference_to_void); 1167 return QualType(); 1168 } 1169 1170 // In ARC, it is forbidden to build references to unqualified pointers. 1171 if (getLangOptions().ObjCAutoRefCount) 1172 T = inferARCLifetimeForPointee(*this, T, Loc, /*reference*/ true); 1173 1174 // Handle restrict on references. 1175 if (LValueRef) 1176 return Context.getLValueReferenceType(T, SpelledAsLValue); 1177 return Context.getRValueReferenceType(T); 1178} 1179 1180/// Check whether the specified array size makes the array type a VLA. If so, 1181/// return true, if not, return the size of the array in SizeVal. 1182static bool isArraySizeVLA(Sema &S, Expr *ArraySize, llvm::APSInt &SizeVal) { 1183 // If the size is an ICE, it certainly isn't a VLA. If we're in a GNU mode 1184 // (like gnu99, but not c99) accept any evaluatable value as an extension. 1185 return S.VerifyIntegerConstantExpression( 1186 ArraySize, &SizeVal, S.PDiag(), S.LangOpts.GNUMode, 1187 S.PDiag(diag::ext_vla_folded_to_constant)).isInvalid(); 1188} 1189 1190 1191/// \brief Build an array type. 1192/// 1193/// \param T The type of each element in the array. 1194/// 1195/// \param ASM C99 array size modifier (e.g., '*', 'static'). 1196/// 1197/// \param ArraySize Expression describing the size of the array. 1198/// 1199/// \param Loc The location of the entity whose type involves this 1200/// array type or, if there is no such entity, the location of the 1201/// type that will have array type. 1202/// 1203/// \param Entity The name of the entity that involves the array 1204/// type, if known. 1205/// 1206/// \returns A suitable array type, if there are no errors. Otherwise, 1207/// returns a NULL type. 1208QualType Sema::BuildArrayType(QualType T, ArrayType::ArraySizeModifier ASM, 1209 Expr *ArraySize, unsigned Quals, 1210 SourceRange Brackets, DeclarationName Entity) { 1211 1212 SourceLocation Loc = Brackets.getBegin(); 1213 if (getLangOptions().CPlusPlus) { 1214 // C++ [dcl.array]p1: 1215 // T is called the array element type; this type shall not be a reference 1216 // type, the (possibly cv-qualified) type void, a function type or an 1217 // abstract class type. 1218 // 1219 // Note: function types are handled in the common path with C. 1220 if (T->isReferenceType()) { 1221 Diag(Loc, diag::err_illegal_decl_array_of_references) 1222 << getPrintableNameForEntity(Entity) << T; 1223 return QualType(); 1224 } 1225 1226 if (T->isVoidType()) { 1227 Diag(Loc, diag::err_illegal_decl_array_incomplete_type) << T; 1228 return QualType(); 1229 } 1230 1231 if (RequireNonAbstractType(Brackets.getBegin(), T, 1232 diag::err_array_of_abstract_type)) 1233 return QualType(); 1234 1235 } else { 1236 // C99 6.7.5.2p1: If the element type is an incomplete or function type, 1237 // reject it (e.g. void ary[7], struct foo ary[7], void ary[7]()) 1238 if (RequireCompleteType(Loc, T, 1239 diag::err_illegal_decl_array_incomplete_type)) 1240 return QualType(); 1241 } 1242 1243 if (T->isFunctionType()) { 1244 Diag(Loc, diag::err_illegal_decl_array_of_functions) 1245 << getPrintableNameForEntity(Entity) << T; 1246 return QualType(); 1247 } 1248 1249 if (T->getContainedAutoType()) { 1250 Diag(Loc, diag::err_illegal_decl_array_of_auto) 1251 << getPrintableNameForEntity(Entity) << T; 1252 return QualType(); 1253 } 1254 1255 if (const RecordType *EltTy = T->getAs<RecordType>()) { 1256 // If the element type is a struct or union that contains a variadic 1257 // array, accept it as a GNU extension: C99 6.7.2.1p2. 1258 if (EltTy->getDecl()->hasFlexibleArrayMember()) 1259 Diag(Loc, diag::ext_flexible_array_in_array) << T; 1260 } else if (T->isObjCObjectType()) { 1261 Diag(Loc, diag::err_objc_array_of_interfaces) << T; 1262 return QualType(); 1263 } 1264 1265 // Do placeholder conversions on the array size expression. 1266 if (ArraySize && ArraySize->hasPlaceholderType()) { 1267 ExprResult Result = CheckPlaceholderExpr(ArraySize); 1268 if (Result.isInvalid()) return QualType(); 1269 ArraySize = Result.take(); 1270 } 1271 1272 // Do lvalue-to-rvalue conversions on the array size expression. 1273 if (ArraySize && !ArraySize->isRValue()) { 1274 ExprResult Result = DefaultLvalueConversion(ArraySize); 1275 if (Result.isInvalid()) 1276 return QualType(); 1277 1278 ArraySize = Result.take(); 1279 } 1280 1281 // C99 6.7.5.2p1: The size expression shall have integer type. 1282 // C++11 allows contextual conversions to such types. 1283 if (!getLangOptions().CPlusPlus0x && 1284 ArraySize && !ArraySize->isTypeDependent() && 1285 !ArraySize->getType()->isIntegralOrUnscopedEnumerationType()) { 1286 Diag(ArraySize->getLocStart(), diag::err_array_size_non_int) 1287 << ArraySize->getType() << ArraySize->getSourceRange(); 1288 return QualType(); 1289 } 1290 1291 llvm::APSInt ConstVal(Context.getTypeSize(Context.getSizeType())); 1292 if (!ArraySize) { 1293 if (ASM == ArrayType::Star) 1294 T = Context.getVariableArrayType(T, 0, ASM, Quals, Brackets); 1295 else 1296 T = Context.getIncompleteArrayType(T, ASM, Quals); 1297 } else if (ArraySize->isTypeDependent() || ArraySize->isValueDependent()) { 1298 T = Context.getDependentSizedArrayType(T, ArraySize, ASM, Quals, Brackets); 1299 } else if ((!T->isDependentType() && !T->isIncompleteType() && 1300 !T->isConstantSizeType()) || 1301 isArraySizeVLA(*this, ArraySize, ConstVal)) { 1302 // Even in C++11, don't allow contextual conversions in the array bound 1303 // of a VLA. 1304 if (getLangOptions().CPlusPlus0x && 1305 !ArraySize->getType()->isIntegralOrUnscopedEnumerationType()) { 1306 Diag(ArraySize->getLocStart(), diag::err_array_size_non_int) 1307 << ArraySize->getType() << ArraySize->getSourceRange(); 1308 return QualType(); 1309 } 1310 1311 // C99: an array with an element type that has a non-constant-size is a VLA. 1312 // C99: an array with a non-ICE size is a VLA. We accept any expression 1313 // that we can fold to a non-zero positive value as an extension. 1314 T = Context.getVariableArrayType(T, ArraySize, ASM, Quals, Brackets); 1315 } else { 1316 // C99 6.7.5.2p1: If the expression is a constant expression, it shall 1317 // have a value greater than zero. 1318 if (ConstVal.isSigned() && ConstVal.isNegative()) { 1319 if (Entity) 1320 Diag(ArraySize->getLocStart(), diag::err_decl_negative_array_size) 1321 << getPrintableNameForEntity(Entity) << ArraySize->getSourceRange(); 1322 else 1323 Diag(ArraySize->getLocStart(), diag::err_typecheck_negative_array_size) 1324 << ArraySize->getSourceRange(); 1325 return QualType(); 1326 } 1327 if (ConstVal == 0) { 1328 // GCC accepts zero sized static arrays. We allow them when 1329 // we're not in a SFINAE context. 1330 Diag(ArraySize->getLocStart(), 1331 isSFINAEContext()? diag::err_typecheck_zero_array_size 1332 : diag::ext_typecheck_zero_array_size) 1333 << ArraySize->getSourceRange(); 1334 1335 if (ASM == ArrayType::Static) { 1336 Diag(ArraySize->getLocStart(), 1337 diag::warn_typecheck_zero_static_array_size) 1338 << ArraySize->getSourceRange(); 1339 ASM = ArrayType::Normal; 1340 } 1341 } else if (!T->isDependentType() && !T->isVariablyModifiedType() && 1342 !T->isIncompleteType()) { 1343 // Is the array too large? 1344 unsigned ActiveSizeBits 1345 = ConstantArrayType::getNumAddressingBits(Context, T, ConstVal); 1346 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) 1347 Diag(ArraySize->getLocStart(), diag::err_array_too_large) 1348 << ConstVal.toString(10) 1349 << ArraySize->getSourceRange(); 1350 } 1351 1352 T = Context.getConstantArrayType(T, ConstVal, ASM, Quals); 1353 } 1354 // If this is not C99, extwarn about VLA's and C99 array size modifiers. 1355 if (!getLangOptions().C99) { 1356 if (T->isVariableArrayType()) { 1357 // Prohibit the use of non-POD types in VLAs. 1358 QualType BaseT = Context.getBaseElementType(T); 1359 if (!T->isDependentType() && 1360 !BaseT.isPODType(Context) && 1361 !BaseT->isObjCLifetimeType()) { 1362 Diag(Loc, diag::err_vla_non_pod) 1363 << BaseT; 1364 return QualType(); 1365 } 1366 // Prohibit the use of VLAs during template argument deduction. 1367 else if (isSFINAEContext()) { 1368 Diag(Loc, diag::err_vla_in_sfinae); 1369 return QualType(); 1370 } 1371 // Just extwarn about VLAs. 1372 else 1373 Diag(Loc, diag::ext_vla); 1374 } else if (ASM != ArrayType::Normal || Quals != 0) 1375 Diag(Loc, 1376 getLangOptions().CPlusPlus? diag::err_c99_array_usage_cxx 1377 : diag::ext_c99_array_usage) << ASM; 1378 } 1379 1380 return T; 1381} 1382 1383/// \brief Build an ext-vector type. 1384/// 1385/// Run the required checks for the extended vector type. 1386QualType Sema::BuildExtVectorType(QualType T, Expr *ArraySize, 1387 SourceLocation AttrLoc) { 1388 // unlike gcc's vector_size attribute, we do not allow vectors to be defined 1389 // in conjunction with complex types (pointers, arrays, functions, etc.). 1390 if (!T->isDependentType() && 1391 !T->isIntegerType() && !T->isRealFloatingType()) { 1392 Diag(AttrLoc, diag::err_attribute_invalid_vector_type) << T; 1393 return QualType(); 1394 } 1395 1396 if (!ArraySize->isTypeDependent() && !ArraySize->isValueDependent()) { 1397 llvm::APSInt vecSize(32); 1398 if (!ArraySize->isIntegerConstantExpr(vecSize, Context)) { 1399 Diag(AttrLoc, diag::err_attribute_argument_not_int) 1400 << "ext_vector_type" << ArraySize->getSourceRange(); 1401 return QualType(); 1402 } 1403 1404 // unlike gcc's vector_size attribute, the size is specified as the 1405 // number of elements, not the number of bytes. 1406 unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue()); 1407 1408 if (vectorSize == 0) { 1409 Diag(AttrLoc, diag::err_attribute_zero_size) 1410 << ArraySize->getSourceRange(); 1411 return QualType(); 1412 } 1413 1414 return Context.getExtVectorType(T, vectorSize); 1415 } 1416 1417 return Context.getDependentSizedExtVectorType(T, ArraySize, AttrLoc); 1418} 1419 1420/// \brief Build a function type. 1421/// 1422/// This routine checks the function type according to C++ rules and 1423/// under the assumption that the result type and parameter types have 1424/// just been instantiated from a template. It therefore duplicates 1425/// some of the behavior of GetTypeForDeclarator, but in a much 1426/// simpler form that is only suitable for this narrow use case. 1427/// 1428/// \param T The return type of the function. 1429/// 1430/// \param ParamTypes The parameter types of the function. This array 1431/// will be modified to account for adjustments to the types of the 1432/// function parameters. 1433/// 1434/// \param NumParamTypes The number of parameter types in ParamTypes. 1435/// 1436/// \param Variadic Whether this is a variadic function type. 1437/// 1438/// \param HasTrailingReturn Whether this function has a trailing return type. 1439/// 1440/// \param Quals The cvr-qualifiers to be applied to the function type. 1441/// 1442/// \param Loc The location of the entity whose type involves this 1443/// function type or, if there is no such entity, the location of the 1444/// type that will have function type. 1445/// 1446/// \param Entity The name of the entity that involves the function 1447/// type, if known. 1448/// 1449/// \returns A suitable function type, if there are no 1450/// errors. Otherwise, returns a NULL type. 1451QualType Sema::BuildFunctionType(QualType T, 1452 QualType *ParamTypes, 1453 unsigned NumParamTypes, 1454 bool Variadic, bool HasTrailingReturn, 1455 unsigned Quals, 1456 RefQualifierKind RefQualifier, 1457 SourceLocation Loc, DeclarationName Entity, 1458 FunctionType::ExtInfo Info) { 1459 if (T->isArrayType() || T->isFunctionType()) { 1460 Diag(Loc, diag::err_func_returning_array_function) 1461 << T->isFunctionType() << T; 1462 return QualType(); 1463 } 1464 1465 // Functions cannot return half FP. 1466 if (T->isHalfType()) { 1467 Diag(Loc, diag::err_parameters_retval_cannot_have_fp16_type) << 1 << 1468 FixItHint::CreateInsertion(Loc, "*"); 1469 return QualType(); 1470 } 1471 1472 bool Invalid = false; 1473 for (unsigned Idx = 0; Idx < NumParamTypes; ++Idx) { 1474 // FIXME: Loc is too inprecise here, should use proper locations for args. 1475 QualType ParamType = Context.getAdjustedParameterType(ParamTypes[Idx]); 1476 if (ParamType->isVoidType()) { 1477 Diag(Loc, diag::err_param_with_void_type); 1478 Invalid = true; 1479 } else if (ParamType->isHalfType()) { 1480 // Disallow half FP arguments. 1481 Diag(Loc, diag::err_parameters_retval_cannot_have_fp16_type) << 0 << 1482 FixItHint::CreateInsertion(Loc, "*"); 1483 Invalid = true; 1484 } 1485 1486 ParamTypes[Idx] = ParamType; 1487 } 1488 1489 if (Invalid) 1490 return QualType(); 1491 1492 FunctionProtoType::ExtProtoInfo EPI; 1493 EPI.Variadic = Variadic; 1494 EPI.HasTrailingReturn = HasTrailingReturn; 1495 EPI.TypeQuals = Quals; 1496 EPI.RefQualifier = RefQualifier; 1497 EPI.ExtInfo = Info; 1498 1499 return Context.getFunctionType(T, ParamTypes, NumParamTypes, EPI); 1500} 1501 1502/// \brief Build a member pointer type \c T Class::*. 1503/// 1504/// \param T the type to which the member pointer refers. 1505/// \param Class the class type into which the member pointer points. 1506/// \param Loc the location where this type begins 1507/// \param Entity the name of the entity that will have this member pointer type 1508/// 1509/// \returns a member pointer type, if successful, or a NULL type if there was 1510/// an error. 1511QualType Sema::BuildMemberPointerType(QualType T, QualType Class, 1512 SourceLocation Loc, 1513 DeclarationName Entity) { 1514 // Verify that we're not building a pointer to pointer to function with 1515 // exception specification. 1516 if (CheckDistantExceptionSpec(T)) { 1517 Diag(Loc, diag::err_distant_exception_spec); 1518 1519 // FIXME: If we're doing this as part of template instantiation, 1520 // we should return immediately. 1521 1522 // Build the type anyway, but use the canonical type so that the 1523 // exception specifiers are stripped off. 1524 T = Context.getCanonicalType(T); 1525 } 1526 1527 // C++ 8.3.3p3: A pointer to member shall not point to ... a member 1528 // with reference type, or "cv void." 1529 if (T->isReferenceType()) { 1530 Diag(Loc, diag::err_illegal_decl_mempointer_to_reference) 1531 << (Entity? Entity.getAsString() : "type name") << T; 1532 return QualType(); 1533 } 1534 1535 if (T->isVoidType()) { 1536 Diag(Loc, diag::err_illegal_decl_mempointer_to_void) 1537 << (Entity? Entity.getAsString() : "type name"); 1538 return QualType(); 1539 } 1540 1541 if (!Class->isDependentType() && !Class->isRecordType()) { 1542 Diag(Loc, diag::err_mempointer_in_nonclass_type) << Class; 1543 return QualType(); 1544 } 1545 1546 // In the Microsoft ABI, the class is allowed to be an incomplete 1547 // type. In such cases, the compiler makes a worst-case assumption. 1548 // We make no such assumption right now, so emit an error if the 1549 // class isn't a complete type. 1550 if (Context.getTargetInfo().getCXXABI() == CXXABI_Microsoft && 1551 RequireCompleteType(Loc, Class, diag::err_incomplete_type)) 1552 return QualType(); 1553 1554 return Context.getMemberPointerType(T, Class.getTypePtr()); 1555} 1556 1557/// \brief Build a block pointer type. 1558/// 1559/// \param T The type to which we'll be building a block pointer. 1560/// 1561/// \param CVR The cvr-qualifiers to be applied to the block pointer type. 1562/// 1563/// \param Loc The location of the entity whose type involves this 1564/// block pointer type or, if there is no such entity, the location of the 1565/// type that will have block pointer type. 1566/// 1567/// \param Entity The name of the entity that involves the block pointer 1568/// type, if known. 1569/// 1570/// \returns A suitable block pointer type, if there are no 1571/// errors. Otherwise, returns a NULL type. 1572QualType Sema::BuildBlockPointerType(QualType T, 1573 SourceLocation Loc, 1574 DeclarationName Entity) { 1575 if (!T->isFunctionType()) { 1576 Diag(Loc, diag::err_nonfunction_block_type); 1577 return QualType(); 1578 } 1579 1580 return Context.getBlockPointerType(T); 1581} 1582 1583QualType Sema::GetTypeFromParser(ParsedType Ty, TypeSourceInfo **TInfo) { 1584 QualType QT = Ty.get(); 1585 if (QT.isNull()) { 1586 if (TInfo) *TInfo = 0; 1587 return QualType(); 1588 } 1589 1590 TypeSourceInfo *DI = 0; 1591 if (const LocInfoType *LIT = dyn_cast<LocInfoType>(QT)) { 1592 QT = LIT->getType(); 1593 DI = LIT->getTypeSourceInfo(); 1594 } 1595 1596 if (TInfo) *TInfo = DI; 1597 return QT; 1598} 1599 1600static void transferARCOwnershipToDeclaratorChunk(TypeProcessingState &state, 1601 Qualifiers::ObjCLifetime ownership, 1602 unsigned chunkIndex); 1603 1604/// Given that this is the declaration of a parameter under ARC, 1605/// attempt to infer attributes and such for pointer-to-whatever 1606/// types. 1607static void inferARCWriteback(TypeProcessingState &state, 1608 QualType &declSpecType) { 1609 Sema &S = state.getSema(); 1610 Declarator &declarator = state.getDeclarator(); 1611 1612 // TODO: should we care about decl qualifiers? 1613 1614 // Check whether the declarator has the expected form. We walk 1615 // from the inside out in order to make the block logic work. 1616 unsigned outermostPointerIndex = 0; 1617 bool isBlockPointer = false; 1618 unsigned numPointers = 0; 1619 for (unsigned i = 0, e = declarator.getNumTypeObjects(); i != e; ++i) { 1620 unsigned chunkIndex = i; 1621 DeclaratorChunk &chunk = declarator.getTypeObject(chunkIndex); 1622 switch (chunk.Kind) { 1623 case DeclaratorChunk::Paren: 1624 // Ignore parens. 1625 break; 1626 1627 case DeclaratorChunk::Reference: 1628 case DeclaratorChunk::Pointer: 1629 // Count the number of pointers. Treat references 1630 // interchangeably as pointers; if they're mis-ordered, normal 1631 // type building will discover that. 1632 outermostPointerIndex = chunkIndex; 1633 numPointers++; 1634 break; 1635 1636 case DeclaratorChunk::BlockPointer: 1637 // If we have a pointer to block pointer, that's an acceptable 1638 // indirect reference; anything else is not an application of 1639 // the rules. 1640 if (numPointers != 1) return; 1641 numPointers++; 1642 outermostPointerIndex = chunkIndex; 1643 isBlockPointer = true; 1644 1645 // We don't care about pointer structure in return values here. 1646 goto done; 1647 1648 case DeclaratorChunk::Array: // suppress if written (id[])? 1649 case DeclaratorChunk::Function: 1650 case DeclaratorChunk::MemberPointer: 1651 return; 1652 } 1653 } 1654 done: 1655 1656 // If we have *one* pointer, then we want to throw the qualifier on 1657 // the declaration-specifiers, which means that it needs to be a 1658 // retainable object type. 1659 if (numPointers == 1) { 1660 // If it's not a retainable object type, the rule doesn't apply. 1661 if (!declSpecType->isObjCRetainableType()) return; 1662 1663 // If it already has lifetime, don't do anything. 1664 if (declSpecType.getObjCLifetime()) return; 1665 1666 // Otherwise, modify the type in-place. 1667 Qualifiers qs; 1668 1669 if (declSpecType->isObjCARCImplicitlyUnretainedType()) 1670 qs.addObjCLifetime(Qualifiers::OCL_ExplicitNone); 1671 else 1672 qs.addObjCLifetime(Qualifiers::OCL_Autoreleasing); 1673 declSpecType = S.Context.getQualifiedType(declSpecType, qs); 1674 1675 // If we have *two* pointers, then we want to throw the qualifier on 1676 // the outermost pointer. 1677 } else if (numPointers == 2) { 1678 // If we don't have a block pointer, we need to check whether the 1679 // declaration-specifiers gave us something that will turn into a 1680 // retainable object pointer after we slap the first pointer on it. 1681 if (!isBlockPointer && !declSpecType->isObjCObjectType()) 1682 return; 1683 1684 // Look for an explicit lifetime attribute there. 1685 DeclaratorChunk &chunk = declarator.getTypeObject(outermostPointerIndex); 1686 if (chunk.Kind != DeclaratorChunk::Pointer && 1687 chunk.Kind != DeclaratorChunk::BlockPointer) 1688 return; 1689 for (const AttributeList *attr = chunk.getAttrs(); attr; 1690 attr = attr->getNext()) 1691 if (attr->getKind() == AttributeList::AT_objc_ownership) 1692 return; 1693 1694 transferARCOwnershipToDeclaratorChunk(state, Qualifiers::OCL_Autoreleasing, 1695 outermostPointerIndex); 1696 1697 // Any other number of pointers/references does not trigger the rule. 1698 } else return; 1699 1700 // TODO: mark whether we did this inference? 1701} 1702 1703static void DiagnoseIgnoredQualifiers(unsigned Quals, 1704 SourceLocation ConstQualLoc, 1705 SourceLocation VolatileQualLoc, 1706 SourceLocation RestrictQualLoc, 1707 Sema& S) { 1708 std::string QualStr; 1709 unsigned NumQuals = 0; 1710 SourceLocation Loc; 1711 1712 FixItHint ConstFixIt; 1713 FixItHint VolatileFixIt; 1714 FixItHint RestrictFixIt; 1715 1716 const SourceManager &SM = S.getSourceManager(); 1717 1718 // FIXME: The locations here are set kind of arbitrarily. It'd be nicer to 1719 // find a range and grow it to encompass all the qualifiers, regardless of 1720 // the order in which they textually appear. 1721 if (Quals & Qualifiers::Const) { 1722 ConstFixIt = FixItHint::CreateRemoval(ConstQualLoc); 1723 QualStr = "const"; 1724 ++NumQuals; 1725 if (!Loc.isValid() || SM.isBeforeInTranslationUnit(ConstQualLoc, Loc)) 1726 Loc = ConstQualLoc; 1727 } 1728 if (Quals & Qualifiers::Volatile) { 1729 VolatileFixIt = FixItHint::CreateRemoval(VolatileQualLoc); 1730 QualStr += (NumQuals == 0 ? "volatile" : " volatile"); 1731 ++NumQuals; 1732 if (!Loc.isValid() || SM.isBeforeInTranslationUnit(VolatileQualLoc, Loc)) 1733 Loc = VolatileQualLoc; 1734 } 1735 if (Quals & Qualifiers::Restrict) { 1736 RestrictFixIt = FixItHint::CreateRemoval(RestrictQualLoc); 1737 QualStr += (NumQuals == 0 ? "restrict" : " restrict"); 1738 ++NumQuals; 1739 if (!Loc.isValid() || SM.isBeforeInTranslationUnit(RestrictQualLoc, Loc)) 1740 Loc = RestrictQualLoc; 1741 } 1742 1743 assert(NumQuals > 0 && "No known qualifiers?"); 1744 1745 S.Diag(Loc, diag::warn_qual_return_type) 1746 << QualStr << NumQuals << ConstFixIt << VolatileFixIt << RestrictFixIt; 1747} 1748 1749static QualType GetDeclSpecTypeForDeclarator(TypeProcessingState &state, 1750 TypeSourceInfo *&ReturnTypeInfo) { 1751 Sema &SemaRef = state.getSema(); 1752 Declarator &D = state.getDeclarator(); 1753 QualType T; 1754 ReturnTypeInfo = 0; 1755 1756 // The TagDecl owned by the DeclSpec. 1757 TagDecl *OwnedTagDecl = 0; 1758 1759 switch (D.getName().getKind()) { 1760 case UnqualifiedId::IK_ImplicitSelfParam: 1761 case UnqualifiedId::IK_OperatorFunctionId: 1762 case UnqualifiedId::IK_Identifier: 1763 case UnqualifiedId::IK_LiteralOperatorId: 1764 case UnqualifiedId::IK_TemplateId: 1765 T = ConvertDeclSpecToType(state); 1766 1767 if (!D.isInvalidType() && D.getDeclSpec().isTypeSpecOwned()) { 1768 OwnedTagDecl = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 1769 // Owned declaration is embedded in declarator. 1770 OwnedTagDecl->setEmbeddedInDeclarator(true); 1771 } 1772 break; 1773 1774 case UnqualifiedId::IK_ConstructorName: 1775 case UnqualifiedId::IK_ConstructorTemplateId: 1776 case UnqualifiedId::IK_DestructorName: 1777 // Constructors and destructors don't have return types. Use 1778 // "void" instead. 1779 T = SemaRef.Context.VoidTy; 1780 break; 1781 1782 case UnqualifiedId::IK_ConversionFunctionId: 1783 // The result type of a conversion function is the type that it 1784 // converts to. 1785 T = SemaRef.GetTypeFromParser(D.getName().ConversionFunctionId, 1786 &ReturnTypeInfo); 1787 break; 1788 } 1789 1790 if (D.getAttributes()) 1791 distributeTypeAttrsFromDeclarator(state, T); 1792 1793 // C++11 [dcl.spec.auto]p5: reject 'auto' if it is not in an allowed context. 1794 // In C++11, a function declarator using 'auto' must have a trailing return 1795 // type (this is checked later) and we can skip this. In other languages 1796 // using auto, we need to check regardless. 1797 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto && 1798 (!SemaRef.getLangOptions().CPlusPlus0x || !D.isFunctionDeclarator())) { 1799 int Error = -1; 1800 1801 switch (D.getContext()) { 1802 case Declarator::KNRTypeListContext: 1803 llvm_unreachable("K&R type lists aren't allowed in C++"); 1804 case Declarator::LambdaExprContext: 1805 llvm_unreachable("Can't specify a type specifier in lambda grammar"); 1806 case Declarator::ObjCParameterContext: 1807 case Declarator::ObjCResultContext: 1808 case Declarator::PrototypeContext: 1809 Error = 0; // Function prototype 1810 break; 1811 case Declarator::MemberContext: 1812 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_static) 1813 break; 1814 switch (cast<TagDecl>(SemaRef.CurContext)->getTagKind()) { 1815 case TTK_Enum: llvm_unreachable("unhandled tag kind"); 1816 case TTK_Struct: Error = 1; /* Struct member */ break; 1817 case TTK_Union: Error = 2; /* Union member */ break; 1818 case TTK_Class: Error = 3; /* Class member */ break; 1819 } 1820 break; 1821 case Declarator::CXXCatchContext: 1822 case Declarator::ObjCCatchContext: 1823 Error = 4; // Exception declaration 1824 break; 1825 case Declarator::TemplateParamContext: 1826 Error = 5; // Template parameter 1827 break; 1828 case Declarator::BlockLiteralContext: 1829 Error = 6; // Block literal 1830 break; 1831 case Declarator::TemplateTypeArgContext: 1832 Error = 7; // Template type argument 1833 break; 1834 case Declarator::AliasDeclContext: 1835 case Declarator::AliasTemplateContext: 1836 Error = 9; // Type alias 1837 break; 1838 case Declarator::TypeNameContext: 1839 Error = 11; // Generic 1840 break; 1841 case Declarator::FileContext: 1842 case Declarator::BlockContext: 1843 case Declarator::ForContext: 1844 case Declarator::ConditionContext: 1845 case Declarator::CXXNewContext: 1846 break; 1847 } 1848 1849 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 1850 Error = 8; 1851 1852 // In Objective-C it is an error to use 'auto' on a function declarator. 1853 if (D.isFunctionDeclarator()) 1854 Error = 10; 1855 1856 // C++11 [dcl.spec.auto]p2: 'auto' is always fine if the declarator 1857 // contains a trailing return type. That is only legal at the outermost 1858 // level. Check all declarator chunks (outermost first) anyway, to give 1859 // better diagnostics. 1860 if (SemaRef.getLangOptions().CPlusPlus0x && Error != -1) { 1861 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 1862 unsigned chunkIndex = e - i - 1; 1863 state.setCurrentChunkIndex(chunkIndex); 1864 DeclaratorChunk &DeclType = D.getTypeObject(chunkIndex); 1865 if (DeclType.Kind == DeclaratorChunk::Function) { 1866 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun; 1867 if (FTI.TrailingReturnType) { 1868 Error = -1; 1869 break; 1870 } 1871 } 1872 } 1873 } 1874 1875 if (Error != -1) { 1876 SemaRef.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 1877 diag::err_auto_not_allowed) 1878 << Error; 1879 T = SemaRef.Context.IntTy; 1880 D.setInvalidType(true); 1881 } else 1882 SemaRef.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 1883 diag::warn_cxx98_compat_auto_type_specifier); 1884 } 1885 1886 if (SemaRef.getLangOptions().CPlusPlus && 1887 OwnedTagDecl && OwnedTagDecl->isCompleteDefinition()) { 1888 // Check the contexts where C++ forbids the declaration of a new class 1889 // or enumeration in a type-specifier-seq. 1890 switch (D.getContext()) { 1891 case Declarator::FileContext: 1892 case Declarator::MemberContext: 1893 case Declarator::BlockContext: 1894 case Declarator::ForContext: 1895 case Declarator::BlockLiteralContext: 1896 case Declarator::LambdaExprContext: 1897 // C++11 [dcl.type]p3: 1898 // A type-specifier-seq shall not define a class or enumeration unless 1899 // it appears in the type-id of an alias-declaration (7.1.3) that is not 1900 // the declaration of a template-declaration. 1901 case Declarator::AliasDeclContext: 1902 break; 1903 case Declarator::AliasTemplateContext: 1904 SemaRef.Diag(OwnedTagDecl->getLocation(), 1905 diag::err_type_defined_in_alias_template) 1906 << SemaRef.Context.getTypeDeclType(OwnedTagDecl); 1907 break; 1908 case Declarator::TypeNameContext: 1909 case Declarator::TemplateParamContext: 1910 case Declarator::CXXNewContext: 1911 case Declarator::CXXCatchContext: 1912 case Declarator::ObjCCatchContext: 1913 case Declarator::TemplateTypeArgContext: 1914 SemaRef.Diag(OwnedTagDecl->getLocation(), 1915 diag::err_type_defined_in_type_specifier) 1916 << SemaRef.Context.getTypeDeclType(OwnedTagDecl); 1917 break; 1918 case Declarator::PrototypeContext: 1919 case Declarator::ObjCParameterContext: 1920 case Declarator::ObjCResultContext: 1921 case Declarator::KNRTypeListContext: 1922 // C++ [dcl.fct]p6: 1923 // Types shall not be defined in return or parameter types. 1924 SemaRef.Diag(OwnedTagDecl->getLocation(), 1925 diag::err_type_defined_in_param_type) 1926 << SemaRef.Context.getTypeDeclType(OwnedTagDecl); 1927 break; 1928 case Declarator::ConditionContext: 1929 // C++ 6.4p2: 1930 // The type-specifier-seq shall not contain typedef and shall not declare 1931 // a new class or enumeration. 1932 SemaRef.Diag(OwnedTagDecl->getLocation(), 1933 diag::err_type_defined_in_condition); 1934 break; 1935 } 1936 } 1937 1938 return T; 1939} 1940 1941std::string getFunctionQualifiersAsString(const FunctionProtoType *FnTy) { 1942 std::string Quals = 1943 Qualifiers::fromCVRMask(FnTy->getTypeQuals()).getAsString(); 1944 1945 switch (FnTy->getRefQualifier()) { 1946 case RQ_None: 1947 break; 1948 1949 case RQ_LValue: 1950 if (!Quals.empty()) 1951 Quals += ' '; 1952 Quals += '&'; 1953 break; 1954 1955 case RQ_RValue: 1956 if (!Quals.empty()) 1957 Quals += ' '; 1958 Quals += "&&"; 1959 break; 1960 } 1961 1962 return Quals; 1963} 1964 1965/// Check that the function type T, which has a cv-qualifier or a ref-qualifier, 1966/// can be contained within the declarator chunk DeclType, and produce an 1967/// appropriate diagnostic if not. 1968static void checkQualifiedFunction(Sema &S, QualType T, 1969 DeclaratorChunk &DeclType) { 1970 // C++98 [dcl.fct]p4 / C++11 [dcl.fct]p6: a function type with a 1971 // cv-qualifier or a ref-qualifier can only appear at the topmost level 1972 // of a type. 1973 int DiagKind = -1; 1974 switch (DeclType.Kind) { 1975 case DeclaratorChunk::Paren: 1976 case DeclaratorChunk::MemberPointer: 1977 // These cases are permitted. 1978 return; 1979 case DeclaratorChunk::Array: 1980 case DeclaratorChunk::Function: 1981 // These cases don't allow function types at all; no need to diagnose the 1982 // qualifiers separately. 1983 return; 1984 case DeclaratorChunk::BlockPointer: 1985 DiagKind = 0; 1986 break; 1987 case DeclaratorChunk::Pointer: 1988 DiagKind = 1; 1989 break; 1990 case DeclaratorChunk::Reference: 1991 DiagKind = 2; 1992 break; 1993 } 1994 1995 assert(DiagKind != -1); 1996 S.Diag(DeclType.Loc, diag::err_compound_qualified_function_type) 1997 << DiagKind << isa<FunctionType>(T.IgnoreParens()) << T 1998 << getFunctionQualifiersAsString(T->castAs<FunctionProtoType>()); 1999} 2000 2001static TypeSourceInfo *GetFullTypeForDeclarator(TypeProcessingState &state, 2002 QualType declSpecType, 2003 TypeSourceInfo *TInfo) { 2004 2005 QualType T = declSpecType; 2006 Declarator &D = state.getDeclarator(); 2007 Sema &S = state.getSema(); 2008 ASTContext &Context = S.Context; 2009 const LangOptions &LangOpts = S.getLangOptions(); 2010 2011 bool ImplicitlyNoexcept = false; 2012 if (D.getName().getKind() == UnqualifiedId::IK_OperatorFunctionId && 2013 LangOpts.CPlusPlus0x) { 2014 OverloadedOperatorKind OO = D.getName().OperatorFunctionId.Operator; 2015 /// In C++0x, deallocation functions (normal and array operator delete) 2016 /// are implicitly noexcept. 2017 if (OO == OO_Delete || OO == OO_Array_Delete) 2018 ImplicitlyNoexcept = true; 2019 } 2020 2021 // The name we're declaring, if any. 2022 DeclarationName Name; 2023 if (D.getIdentifier()) 2024 Name = D.getIdentifier(); 2025 2026 // Does this declaration declare a typedef-name? 2027 bool IsTypedefName = 2028 D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef || 2029 D.getContext() == Declarator::AliasDeclContext || 2030 D.getContext() == Declarator::AliasTemplateContext; 2031 2032 // Does T refer to a function type with a cv-qualifier or a ref-qualifier? 2033 bool IsQualifiedFunction = T->isFunctionProtoType() && 2034 (T->castAs<FunctionProtoType>()->getTypeQuals() != 0 || 2035 T->castAs<FunctionProtoType>()->getRefQualifier() != RQ_None); 2036 2037 // Walk the DeclTypeInfo, building the recursive type as we go. 2038 // DeclTypeInfos are ordered from the identifier out, which is 2039 // opposite of what we want :). 2040 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 2041 unsigned chunkIndex = e - i - 1; 2042 state.setCurrentChunkIndex(chunkIndex); 2043 DeclaratorChunk &DeclType = D.getTypeObject(chunkIndex); 2044 if (IsQualifiedFunction) { 2045 checkQualifiedFunction(S, T, DeclType); 2046 IsQualifiedFunction = DeclType.Kind == DeclaratorChunk::Paren; 2047 } 2048 switch (DeclType.Kind) { 2049 case DeclaratorChunk::Paren: 2050 T = S.BuildParenType(T); 2051 break; 2052 case DeclaratorChunk::BlockPointer: 2053 // If blocks are disabled, emit an error. 2054 if (!LangOpts.Blocks) 2055 S.Diag(DeclType.Loc, diag::err_blocks_disable); 2056 2057 T = S.BuildBlockPointerType(T, D.getIdentifierLoc(), Name); 2058 if (DeclType.Cls.TypeQuals) 2059 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Cls.TypeQuals); 2060 break; 2061 case DeclaratorChunk::Pointer: 2062 // Verify that we're not building a pointer to pointer to function with 2063 // exception specification. 2064 if (LangOpts.CPlusPlus && S.CheckDistantExceptionSpec(T)) { 2065 S.Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 2066 D.setInvalidType(true); 2067 // Build the type anyway. 2068 } 2069 if (LangOpts.ObjC1 && T->getAs<ObjCObjectType>()) { 2070 T = Context.getObjCObjectPointerType(T); 2071 if (DeclType.Ptr.TypeQuals) 2072 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Ptr.TypeQuals); 2073 break; 2074 } 2075 T = S.BuildPointerType(T, DeclType.Loc, Name); 2076 if (DeclType.Ptr.TypeQuals) 2077 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Ptr.TypeQuals); 2078 2079 break; 2080 case DeclaratorChunk::Reference: { 2081 // Verify that we're not building a reference to pointer to function with 2082 // exception specification. 2083 if (LangOpts.CPlusPlus && S.CheckDistantExceptionSpec(T)) { 2084 S.Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 2085 D.setInvalidType(true); 2086 // Build the type anyway. 2087 } 2088 T = S.BuildReferenceType(T, DeclType.Ref.LValueRef, DeclType.Loc, Name); 2089 2090 Qualifiers Quals; 2091 if (DeclType.Ref.HasRestrict) 2092 T = S.BuildQualifiedType(T, DeclType.Loc, Qualifiers::Restrict); 2093 break; 2094 } 2095 case DeclaratorChunk::Array: { 2096 // Verify that we're not building an array of pointers to function with 2097 // exception specification. 2098 if (LangOpts.CPlusPlus && S.CheckDistantExceptionSpec(T)) { 2099 S.Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 2100 D.setInvalidType(true); 2101 // Build the type anyway. 2102 } 2103 DeclaratorChunk::ArrayTypeInfo &ATI = DeclType.Arr; 2104 Expr *ArraySize = static_cast<Expr*>(ATI.NumElts); 2105 ArrayType::ArraySizeModifier ASM; 2106 if (ATI.isStar) 2107 ASM = ArrayType::Star; 2108 else if (ATI.hasStatic) 2109 ASM = ArrayType::Static; 2110 else 2111 ASM = ArrayType::Normal; 2112 if (ASM == ArrayType::Star && !D.isPrototypeContext()) { 2113 // FIXME: This check isn't quite right: it allows star in prototypes 2114 // for function definitions, and disallows some edge cases detailed 2115 // in http://gcc.gnu.org/ml/gcc-patches/2009-02/msg00133.html 2116 S.Diag(DeclType.Loc, diag::err_array_star_outside_prototype); 2117 ASM = ArrayType::Normal; 2118 D.setInvalidType(true); 2119 } 2120 T = S.BuildArrayType(T, ASM, ArraySize, ATI.TypeQuals, 2121 SourceRange(DeclType.Loc, DeclType.EndLoc), Name); 2122 break; 2123 } 2124 case DeclaratorChunk::Function: { 2125 // If the function declarator has a prototype (i.e. it is not () and 2126 // does not have a K&R-style identifier list), then the arguments are part 2127 // of the type, otherwise the argument list is (). 2128 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun; 2129 IsQualifiedFunction = FTI.TypeQuals || FTI.hasRefQualifier(); 2130 2131 // Check for auto functions and trailing return type and adjust the 2132 // return type accordingly. 2133 if (!D.isInvalidType()) { 2134 // trailing-return-type is only required if we're declaring a function, 2135 // and not, for instance, a pointer to a function. 2136 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto && 2137 !FTI.TrailingReturnType && chunkIndex == 0) { 2138 S.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 2139 diag::err_auto_missing_trailing_return); 2140 T = Context.IntTy; 2141 D.setInvalidType(true); 2142 } else if (FTI.TrailingReturnType) { 2143 // T must be exactly 'auto' at this point. See CWG issue 681. 2144 if (isa<ParenType>(T)) { 2145 S.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 2146 diag::err_trailing_return_in_parens) 2147 << T << D.getDeclSpec().getSourceRange(); 2148 D.setInvalidType(true); 2149 } else if (D.getContext() != Declarator::LambdaExprContext && 2150 (T.hasQualifiers() || !isa<AutoType>(T))) { 2151 S.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 2152 diag::err_trailing_return_without_auto) 2153 << T << D.getDeclSpec().getSourceRange(); 2154 D.setInvalidType(true); 2155 } 2156 2157 T = S.GetTypeFromParser( 2158 ParsedType::getFromOpaquePtr(FTI.TrailingReturnType), 2159 &TInfo); 2160 } 2161 } 2162 2163 // C99 6.7.5.3p1: The return type may not be a function or array type. 2164 // For conversion functions, we'll diagnose this particular error later. 2165 if ((T->isArrayType() || T->isFunctionType()) && 2166 (D.getName().getKind() != UnqualifiedId::IK_ConversionFunctionId)) { 2167 unsigned diagID = diag::err_func_returning_array_function; 2168 // Last processing chunk in block context means this function chunk 2169 // represents the block. 2170 if (chunkIndex == 0 && 2171 D.getContext() == Declarator::BlockLiteralContext) 2172 diagID = diag::err_block_returning_array_function; 2173 S.Diag(DeclType.Loc, diagID) << T->isFunctionType() << T; 2174 T = Context.IntTy; 2175 D.setInvalidType(true); 2176 } 2177 2178 // Do not allow returning half FP value. 2179 // FIXME: This really should be in BuildFunctionType. 2180 if (T->isHalfType()) { 2181 S.Diag(D.getIdentifierLoc(), 2182 diag::err_parameters_retval_cannot_have_fp16_type) << 1 2183 << FixItHint::CreateInsertion(D.getIdentifierLoc(), "*"); 2184 D.setInvalidType(true); 2185 } 2186 2187 // cv-qualifiers on return types are pointless except when the type is a 2188 // class type in C++. 2189 if (isa<PointerType>(T) && T.getLocalCVRQualifiers() && 2190 (D.getName().getKind() != UnqualifiedId::IK_ConversionFunctionId) && 2191 (!LangOpts.CPlusPlus || !T->isDependentType())) { 2192 assert(chunkIndex + 1 < e && "No DeclaratorChunk for the return type?"); 2193 DeclaratorChunk ReturnTypeChunk = D.getTypeObject(chunkIndex + 1); 2194 assert(ReturnTypeChunk.Kind == DeclaratorChunk::Pointer); 2195 2196 DeclaratorChunk::PointerTypeInfo &PTI = ReturnTypeChunk.Ptr; 2197 2198 DiagnoseIgnoredQualifiers(PTI.TypeQuals, 2199 SourceLocation::getFromRawEncoding(PTI.ConstQualLoc), 2200 SourceLocation::getFromRawEncoding(PTI.VolatileQualLoc), 2201 SourceLocation::getFromRawEncoding(PTI.RestrictQualLoc), 2202 S); 2203 2204 } else if (T.getCVRQualifiers() && D.getDeclSpec().getTypeQualifiers() && 2205 (!LangOpts.CPlusPlus || 2206 (!T->isDependentType() && !T->isRecordType()))) { 2207 2208 DiagnoseIgnoredQualifiers(D.getDeclSpec().getTypeQualifiers(), 2209 D.getDeclSpec().getConstSpecLoc(), 2210 D.getDeclSpec().getVolatileSpecLoc(), 2211 D.getDeclSpec().getRestrictSpecLoc(), 2212 S); 2213 } 2214 2215 if (LangOpts.CPlusPlus && D.getDeclSpec().isTypeSpecOwned()) { 2216 // C++ [dcl.fct]p6: 2217 // Types shall not be defined in return or parameter types. 2218 TagDecl *Tag = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 2219 if (Tag->isCompleteDefinition()) 2220 S.Diag(Tag->getLocation(), diag::err_type_defined_in_result_type) 2221 << Context.getTypeDeclType(Tag); 2222 } 2223 2224 // Exception specs are not allowed in typedefs. Complain, but add it 2225 // anyway. 2226 if (IsTypedefName && FTI.getExceptionSpecType()) 2227 S.Diag(FTI.getExceptionSpecLoc(), diag::err_exception_spec_in_typedef) 2228 << (D.getContext() == Declarator::AliasDeclContext || 2229 D.getContext() == Declarator::AliasTemplateContext); 2230 2231 if (!FTI.NumArgs && !FTI.isVariadic && !LangOpts.CPlusPlus) { 2232 // Simple void foo(), where the incoming T is the result type. 2233 T = Context.getFunctionNoProtoType(T); 2234 } else { 2235 // We allow a zero-parameter variadic function in C if the 2236 // function is marked with the "overloadable" attribute. Scan 2237 // for this attribute now. 2238 if (!FTI.NumArgs && FTI.isVariadic && !LangOpts.CPlusPlus) { 2239 bool Overloadable = false; 2240 for (const AttributeList *Attrs = D.getAttributes(); 2241 Attrs; Attrs = Attrs->getNext()) { 2242 if (Attrs->getKind() == AttributeList::AT_overloadable) { 2243 Overloadable = true; 2244 break; 2245 } 2246 } 2247 2248 if (!Overloadable) 2249 S.Diag(FTI.getEllipsisLoc(), diag::err_ellipsis_first_arg); 2250 } 2251 2252 if (FTI.NumArgs && FTI.ArgInfo[0].Param == 0) { 2253 // C99 6.7.5.3p3: Reject int(x,y,z) when it's not a function 2254 // definition. 2255 S.Diag(FTI.ArgInfo[0].IdentLoc, diag::err_ident_list_in_fn_declaration); 2256 D.setInvalidType(true); 2257 break; 2258 } 2259 2260 FunctionProtoType::ExtProtoInfo EPI; 2261 EPI.Variadic = FTI.isVariadic; 2262 EPI.HasTrailingReturn = FTI.TrailingReturnType; 2263 EPI.TypeQuals = FTI.TypeQuals; 2264 EPI.RefQualifier = !FTI.hasRefQualifier()? RQ_None 2265 : FTI.RefQualifierIsLValueRef? RQ_LValue 2266 : RQ_RValue; 2267 2268 // Otherwise, we have a function with an argument list that is 2269 // potentially variadic. 2270 SmallVector<QualType, 16> ArgTys; 2271 ArgTys.reserve(FTI.NumArgs); 2272 2273 SmallVector<bool, 16> ConsumedArguments; 2274 ConsumedArguments.reserve(FTI.NumArgs); 2275 bool HasAnyConsumedArguments = false; 2276 2277 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 2278 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 2279 QualType ArgTy = Param->getType(); 2280 assert(!ArgTy.isNull() && "Couldn't parse type?"); 2281 2282 // Adjust the parameter type. 2283 assert((ArgTy == Context.getAdjustedParameterType(ArgTy)) && 2284 "Unadjusted type?"); 2285 2286 // Look for 'void'. void is allowed only as a single argument to a 2287 // function with no other parameters (C99 6.7.5.3p10). We record 2288 // int(void) as a FunctionProtoType with an empty argument list. 2289 if (ArgTy->isVoidType()) { 2290 // If this is something like 'float(int, void)', reject it. 'void' 2291 // is an incomplete type (C99 6.2.5p19) and function decls cannot 2292 // have arguments of incomplete type. 2293 if (FTI.NumArgs != 1 || FTI.isVariadic) { 2294 S.Diag(DeclType.Loc, diag::err_void_only_param); 2295 ArgTy = Context.IntTy; 2296 Param->setType(ArgTy); 2297 } else if (FTI.ArgInfo[i].Ident) { 2298 // Reject, but continue to parse 'int(void abc)'. 2299 S.Diag(FTI.ArgInfo[i].IdentLoc, 2300 diag::err_param_with_void_type); 2301 ArgTy = Context.IntTy; 2302 Param->setType(ArgTy); 2303 } else { 2304 // Reject, but continue to parse 'float(const void)'. 2305 if (ArgTy.hasQualifiers()) 2306 S.Diag(DeclType.Loc, diag::err_void_param_qualified); 2307 2308 // Do not add 'void' to the ArgTys list. 2309 break; 2310 } 2311 } else if (ArgTy->isHalfType()) { 2312 // Disallow half FP arguments. 2313 // FIXME: This really should be in BuildFunctionType. 2314 S.Diag(Param->getLocation(), 2315 diag::err_parameters_retval_cannot_have_fp16_type) << 0 2316 << FixItHint::CreateInsertion(Param->getLocation(), "*"); 2317 D.setInvalidType(); 2318 } else if (!FTI.hasPrototype) { 2319 if (ArgTy->isPromotableIntegerType()) { 2320 ArgTy = Context.getPromotedIntegerType(ArgTy); 2321 Param->setKNRPromoted(true); 2322 } else if (const BuiltinType* BTy = ArgTy->getAs<BuiltinType>()) { 2323 if (BTy->getKind() == BuiltinType::Float) { 2324 ArgTy = Context.DoubleTy; 2325 Param->setKNRPromoted(true); 2326 } 2327 } 2328 } 2329 2330 if (LangOpts.ObjCAutoRefCount) { 2331 bool Consumed = Param->hasAttr<NSConsumedAttr>(); 2332 ConsumedArguments.push_back(Consumed); 2333 HasAnyConsumedArguments |= Consumed; 2334 } 2335 2336 ArgTys.push_back(ArgTy); 2337 } 2338 2339 if (HasAnyConsumedArguments) 2340 EPI.ConsumedArguments = ConsumedArguments.data(); 2341 2342 SmallVector<QualType, 4> Exceptions; 2343 EPI.ExceptionSpecType = FTI.getExceptionSpecType(); 2344 if (FTI.getExceptionSpecType() == EST_Dynamic) { 2345 Exceptions.reserve(FTI.NumExceptions); 2346 for (unsigned ei = 0, ee = FTI.NumExceptions; ei != ee; ++ei) { 2347 // FIXME: Preserve type source info. 2348 QualType ET = S.GetTypeFromParser(FTI.Exceptions[ei].Ty); 2349 // Check that the type is valid for an exception spec, and 2350 // drop it if not. 2351 if (!S.CheckSpecifiedExceptionType(ET, FTI.Exceptions[ei].Range)) 2352 Exceptions.push_back(ET); 2353 } 2354 EPI.NumExceptions = Exceptions.size(); 2355 EPI.Exceptions = Exceptions.data(); 2356 } else if (FTI.getExceptionSpecType() == EST_ComputedNoexcept) { 2357 // If an error occurred, there's no expression here. 2358 if (Expr *NoexceptExpr = FTI.NoexceptExpr) { 2359 assert((NoexceptExpr->isTypeDependent() || 2360 NoexceptExpr->getType()->getCanonicalTypeUnqualified() == 2361 Context.BoolTy) && 2362 "Parser should have made sure that the expression is boolean"); 2363 if (!NoexceptExpr->isValueDependent()) 2364 NoexceptExpr = S.VerifyIntegerConstantExpression(NoexceptExpr, 0, 2365 S.PDiag(diag::err_noexcept_needs_constant_expression), 2366 /*AllowFold*/ false).take(); 2367 EPI.NoexceptExpr = NoexceptExpr; 2368 } 2369 } else if (FTI.getExceptionSpecType() == EST_None && 2370 ImplicitlyNoexcept && chunkIndex == 0) { 2371 // Only the outermost chunk is marked noexcept, of course. 2372 EPI.ExceptionSpecType = EST_BasicNoexcept; 2373 } 2374 2375 T = Context.getFunctionType(T, ArgTys.data(), ArgTys.size(), EPI); 2376 } 2377 2378 break; 2379 } 2380 case DeclaratorChunk::MemberPointer: 2381 // The scope spec must refer to a class, or be dependent. 2382 CXXScopeSpec &SS = DeclType.Mem.Scope(); 2383 QualType ClsType; 2384 if (SS.isInvalid()) { 2385 // Avoid emitting extra errors if we already errored on the scope. 2386 D.setInvalidType(true); 2387 } else if (S.isDependentScopeSpecifier(SS) || 2388 dyn_cast_or_null<CXXRecordDecl>(S.computeDeclContext(SS))) { 2389 NestedNameSpecifier *NNS 2390 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 2391 NestedNameSpecifier *NNSPrefix = NNS->getPrefix(); 2392 switch (NNS->getKind()) { 2393 case NestedNameSpecifier::Identifier: 2394 ClsType = Context.getDependentNameType(ETK_None, NNSPrefix, 2395 NNS->getAsIdentifier()); 2396 break; 2397 2398 case NestedNameSpecifier::Namespace: 2399 case NestedNameSpecifier::NamespaceAlias: 2400 case NestedNameSpecifier::Global: 2401 llvm_unreachable("Nested-name-specifier must name a type"); 2402 2403 case NestedNameSpecifier::TypeSpec: 2404 case NestedNameSpecifier::TypeSpecWithTemplate: 2405 ClsType = QualType(NNS->getAsType(), 0); 2406 // Note: if the NNS has a prefix and ClsType is a nondependent 2407 // TemplateSpecializationType, then the NNS prefix is NOT included 2408 // in ClsType; hence we wrap ClsType into an ElaboratedType. 2409 // NOTE: in particular, no wrap occurs if ClsType already is an 2410 // Elaborated, DependentName, or DependentTemplateSpecialization. 2411 if (NNSPrefix && isa<TemplateSpecializationType>(NNS->getAsType())) 2412 ClsType = Context.getElaboratedType(ETK_None, NNSPrefix, ClsType); 2413 break; 2414 } 2415 } else { 2416 S.Diag(DeclType.Mem.Scope().getBeginLoc(), 2417 diag::err_illegal_decl_mempointer_in_nonclass) 2418 << (D.getIdentifier() ? D.getIdentifier()->getName() : "type name") 2419 << DeclType.Mem.Scope().getRange(); 2420 D.setInvalidType(true); 2421 } 2422 2423 if (!ClsType.isNull()) 2424 T = S.BuildMemberPointerType(T, ClsType, DeclType.Loc, D.getIdentifier()); 2425 if (T.isNull()) { 2426 T = Context.IntTy; 2427 D.setInvalidType(true); 2428 } else if (DeclType.Mem.TypeQuals) { 2429 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Mem.TypeQuals); 2430 } 2431 break; 2432 } 2433 2434 if (T.isNull()) { 2435 D.setInvalidType(true); 2436 T = Context.IntTy; 2437 } 2438 2439 // See if there are any attributes on this declarator chunk. 2440 if (AttributeList *attrs = const_cast<AttributeList*>(DeclType.getAttrs())) 2441 processTypeAttrs(state, T, false, attrs); 2442 } 2443 2444 if (LangOpts.CPlusPlus && T->isFunctionType()) { 2445 const FunctionProtoType *FnTy = T->getAs<FunctionProtoType>(); 2446 assert(FnTy && "Why oh why is there not a FunctionProtoType here?"); 2447 2448 // C++ 8.3.5p4: 2449 // A cv-qualifier-seq shall only be part of the function type 2450 // for a nonstatic member function, the function type to which a pointer 2451 // to member refers, or the top-level function type of a function typedef 2452 // declaration. 2453 // 2454 // Core issue 547 also allows cv-qualifiers on function types that are 2455 // top-level template type arguments. 2456 bool FreeFunction; 2457 if (!D.getCXXScopeSpec().isSet()) { 2458 FreeFunction = ((D.getContext() != Declarator::MemberContext && 2459 D.getContext() != Declarator::LambdaExprContext) || 2460 D.getDeclSpec().isFriendSpecified()); 2461 } else { 2462 DeclContext *DC = S.computeDeclContext(D.getCXXScopeSpec()); 2463 FreeFunction = (DC && !DC->isRecord()); 2464 } 2465 2466 // C++0x [dcl.constexpr]p8: A constexpr specifier for a non-static member 2467 // function that is not a constructor declares that function to be const. 2468 if (D.getDeclSpec().isConstexprSpecified() && !FreeFunction && 2469 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static && 2470 D.getName().getKind() != UnqualifiedId::IK_ConstructorName && 2471 D.getName().getKind() != UnqualifiedId::IK_ConstructorTemplateId && 2472 !(FnTy->getTypeQuals() & DeclSpec::TQ_const)) { 2473 // Rebuild function type adding a 'const' qualifier. 2474 FunctionProtoType::ExtProtoInfo EPI = FnTy->getExtProtoInfo(); 2475 EPI.TypeQuals |= DeclSpec::TQ_const; 2476 T = Context.getFunctionType(FnTy->getResultType(), 2477 FnTy->arg_type_begin(), 2478 FnTy->getNumArgs(), EPI); 2479 } 2480 2481 // C++11 [dcl.fct]p6 (w/DR1417): 2482 // An attempt to specify a function type with a cv-qualifier-seq or a 2483 // ref-qualifier (including by typedef-name) is ill-formed unless it is: 2484 // - the function type for a non-static member function, 2485 // - the function type to which a pointer to member refers, 2486 // - the top-level function type of a function typedef declaration or 2487 // alias-declaration, 2488 // - the type-id in the default argument of a type-parameter, or 2489 // - the type-id of a template-argument for a type-parameter 2490 if (IsQualifiedFunction && 2491 !(!FreeFunction && 2492 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) && 2493 !IsTypedefName && 2494 D.getContext() != Declarator::TemplateTypeArgContext) { 2495 SourceLocation Loc = D.getSourceRange().getBegin(); 2496 SourceRange RemovalRange; 2497 unsigned I; 2498 if (D.isFunctionDeclarator(I)) { 2499 SmallVector<SourceLocation, 4> RemovalLocs; 2500 const DeclaratorChunk &Chunk = D.getTypeObject(I); 2501 assert(Chunk.Kind == DeclaratorChunk::Function); 2502 if (Chunk.Fun.hasRefQualifier()) 2503 RemovalLocs.push_back(Chunk.Fun.getRefQualifierLoc()); 2504 if (Chunk.Fun.TypeQuals & Qualifiers::Const) 2505 RemovalLocs.push_back(Chunk.Fun.getConstQualifierLoc()); 2506 if (Chunk.Fun.TypeQuals & Qualifiers::Volatile) 2507 RemovalLocs.push_back(Chunk.Fun.getVolatileQualifierLoc()); 2508 // FIXME: We do not track the location of the __restrict qualifier. 2509 //if (Chunk.Fun.TypeQuals & Qualifiers::Restrict) 2510 // RemovalLocs.push_back(Chunk.Fun.getRestrictQualifierLoc()); 2511 if (!RemovalLocs.empty()) { 2512 std::sort(RemovalLocs.begin(), RemovalLocs.end(), 2513 SourceManager::LocBeforeThanCompare(S.getSourceManager())); 2514 RemovalRange = SourceRange(RemovalLocs.front(), RemovalLocs.back()); 2515 Loc = RemovalLocs.front(); 2516 } 2517 } 2518 2519 S.Diag(Loc, diag::err_invalid_qualified_function_type) 2520 << FreeFunction << D.isFunctionDeclarator() << T 2521 << getFunctionQualifiersAsString(FnTy) 2522 << FixItHint::CreateRemoval(RemovalRange); 2523 2524 // Strip the cv-qualifiers and ref-qualifiers from the type. 2525 FunctionProtoType::ExtProtoInfo EPI = FnTy->getExtProtoInfo(); 2526 EPI.TypeQuals = 0; 2527 EPI.RefQualifier = RQ_None; 2528 2529 T = Context.getFunctionType(FnTy->getResultType(), 2530 FnTy->arg_type_begin(), 2531 FnTy->getNumArgs(), EPI); 2532 } 2533 } 2534 2535 // Apply any undistributed attributes from the declarator. 2536 if (!T.isNull()) 2537 if (AttributeList *attrs = D.getAttributes()) 2538 processTypeAttrs(state, T, false, attrs); 2539 2540 // Diagnose any ignored type attributes. 2541 if (!T.isNull()) state.diagnoseIgnoredTypeAttrs(T); 2542 2543 // C++0x [dcl.constexpr]p9: 2544 // A constexpr specifier used in an object declaration declares the object 2545 // as const. 2546 if (D.getDeclSpec().isConstexprSpecified() && T->isObjectType()) { 2547 T.addConst(); 2548 } 2549 2550 // If there was an ellipsis in the declarator, the declaration declares a 2551 // parameter pack whose type may be a pack expansion type. 2552 if (D.hasEllipsis() && !T.isNull()) { 2553 // C++0x [dcl.fct]p13: 2554 // A declarator-id or abstract-declarator containing an ellipsis shall 2555 // only be used in a parameter-declaration. Such a parameter-declaration 2556 // is a parameter pack (14.5.3). [...] 2557 switch (D.getContext()) { 2558 case Declarator::PrototypeContext: 2559 // C++0x [dcl.fct]p13: 2560 // [...] When it is part of a parameter-declaration-clause, the 2561 // parameter pack is a function parameter pack (14.5.3). The type T 2562 // of the declarator-id of the function parameter pack shall contain 2563 // a template parameter pack; each template parameter pack in T is 2564 // expanded by the function parameter pack. 2565 // 2566 // We represent function parameter packs as function parameters whose 2567 // type is a pack expansion. 2568 if (!T->containsUnexpandedParameterPack()) { 2569 S.Diag(D.getEllipsisLoc(), 2570 diag::err_function_parameter_pack_without_parameter_packs) 2571 << T << D.getSourceRange(); 2572 D.setEllipsisLoc(SourceLocation()); 2573 } else { 2574 T = Context.getPackExpansionType(T, llvm::Optional<unsigned>()); 2575 } 2576 break; 2577 2578 case Declarator::TemplateParamContext: 2579 // C++0x [temp.param]p15: 2580 // If a template-parameter is a [...] is a parameter-declaration that 2581 // declares a parameter pack (8.3.5), then the template-parameter is a 2582 // template parameter pack (14.5.3). 2583 // 2584 // Note: core issue 778 clarifies that, if there are any unexpanded 2585 // parameter packs in the type of the non-type template parameter, then 2586 // it expands those parameter packs. 2587 if (T->containsUnexpandedParameterPack()) 2588 T = Context.getPackExpansionType(T, llvm::Optional<unsigned>()); 2589 else 2590 S.Diag(D.getEllipsisLoc(), 2591 LangOpts.CPlusPlus0x 2592 ? diag::warn_cxx98_compat_variadic_templates 2593 : diag::ext_variadic_templates); 2594 break; 2595 2596 case Declarator::FileContext: 2597 case Declarator::KNRTypeListContext: 2598 case Declarator::ObjCParameterContext: // FIXME: special diagnostic here? 2599 case Declarator::ObjCResultContext: // FIXME: special diagnostic here? 2600 case Declarator::TypeNameContext: 2601 case Declarator::CXXNewContext: 2602 case Declarator::AliasDeclContext: 2603 case Declarator::AliasTemplateContext: 2604 case Declarator::MemberContext: 2605 case Declarator::BlockContext: 2606 case Declarator::ForContext: 2607 case Declarator::ConditionContext: 2608 case Declarator::CXXCatchContext: 2609 case Declarator::ObjCCatchContext: 2610 case Declarator::BlockLiteralContext: 2611 case Declarator::LambdaExprContext: 2612 case Declarator::TemplateTypeArgContext: 2613 // FIXME: We may want to allow parameter packs in block-literal contexts 2614 // in the future. 2615 S.Diag(D.getEllipsisLoc(), diag::err_ellipsis_in_declarator_not_parameter); 2616 D.setEllipsisLoc(SourceLocation()); 2617 break; 2618 } 2619 } 2620 2621 if (T.isNull()) 2622 return Context.getNullTypeSourceInfo(); 2623 else if (D.isInvalidType()) 2624 return Context.getTrivialTypeSourceInfo(T); 2625 2626 return S.GetTypeSourceInfoForDeclarator(D, T, TInfo); 2627} 2628 2629/// GetTypeForDeclarator - Convert the type for the specified 2630/// declarator to Type instances. 2631/// 2632/// The result of this call will never be null, but the associated 2633/// type may be a null type if there's an unrecoverable error. 2634TypeSourceInfo *Sema::GetTypeForDeclarator(Declarator &D, Scope *S) { 2635 // Determine the type of the declarator. Not all forms of declarator 2636 // have a type. 2637 2638 TypeProcessingState state(*this, D); 2639 2640 TypeSourceInfo *ReturnTypeInfo = 0; 2641 QualType T = GetDeclSpecTypeForDeclarator(state, ReturnTypeInfo); 2642 if (T.isNull()) 2643 return Context.getNullTypeSourceInfo(); 2644 2645 if (D.isPrototypeContext() && getLangOptions().ObjCAutoRefCount) 2646 inferARCWriteback(state, T); 2647 2648 return GetFullTypeForDeclarator(state, T, ReturnTypeInfo); 2649} 2650 2651static void transferARCOwnershipToDeclSpec(Sema &S, 2652 QualType &declSpecTy, 2653 Qualifiers::ObjCLifetime ownership) { 2654 if (declSpecTy->isObjCRetainableType() && 2655 declSpecTy.getObjCLifetime() == Qualifiers::OCL_None) { 2656 Qualifiers qs; 2657 qs.addObjCLifetime(ownership); 2658 declSpecTy = S.Context.getQualifiedType(declSpecTy, qs); 2659 } 2660} 2661 2662static void transferARCOwnershipToDeclaratorChunk(TypeProcessingState &state, 2663 Qualifiers::ObjCLifetime ownership, 2664 unsigned chunkIndex) { 2665 Sema &S = state.getSema(); 2666 Declarator &D = state.getDeclarator(); 2667 2668 // Look for an explicit lifetime attribute. 2669 DeclaratorChunk &chunk = D.getTypeObject(chunkIndex); 2670 for (const AttributeList *attr = chunk.getAttrs(); attr; 2671 attr = attr->getNext()) 2672 if (attr->getKind() == AttributeList::AT_objc_ownership) 2673 return; 2674 2675 const char *attrStr = 0; 2676 switch (ownership) { 2677 case Qualifiers::OCL_None: llvm_unreachable("no ownership!"); 2678 case Qualifiers::OCL_ExplicitNone: attrStr = "none"; break; 2679 case Qualifiers::OCL_Strong: attrStr = "strong"; break; 2680 case Qualifiers::OCL_Weak: attrStr = "weak"; break; 2681 case Qualifiers::OCL_Autoreleasing: attrStr = "autoreleasing"; break; 2682 } 2683 2684 // If there wasn't one, add one (with an invalid source location 2685 // so that we don't make an AttributedType for it). 2686 AttributeList *attr = D.getAttributePool() 2687 .create(&S.Context.Idents.get("objc_ownership"), SourceLocation(), 2688 /*scope*/ 0, SourceLocation(), 2689 &S.Context.Idents.get(attrStr), SourceLocation(), 2690 /*args*/ 0, 0, 2691 /*declspec*/ false, /*C++0x*/ false); 2692 spliceAttrIntoList(*attr, chunk.getAttrListRef()); 2693 2694 // TODO: mark whether we did this inference? 2695} 2696 2697/// \brief Used for transfering ownership in casts resulting in l-values. 2698static void transferARCOwnership(TypeProcessingState &state, 2699 QualType &declSpecTy, 2700 Qualifiers::ObjCLifetime ownership) { 2701 Sema &S = state.getSema(); 2702 Declarator &D = state.getDeclarator(); 2703 2704 int inner = -1; 2705 bool hasIndirection = false; 2706 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 2707 DeclaratorChunk &chunk = D.getTypeObject(i); 2708 switch (chunk.Kind) { 2709 case DeclaratorChunk::Paren: 2710 // Ignore parens. 2711 break; 2712 2713 case DeclaratorChunk::Array: 2714 case DeclaratorChunk::Reference: 2715 case DeclaratorChunk::Pointer: 2716 if (inner != -1) 2717 hasIndirection = true; 2718 inner = i; 2719 break; 2720 2721 case DeclaratorChunk::BlockPointer: 2722 if (inner != -1) 2723 transferARCOwnershipToDeclaratorChunk(state, ownership, i); 2724 return; 2725 2726 case DeclaratorChunk::Function: 2727 case DeclaratorChunk::MemberPointer: 2728 return; 2729 } 2730 } 2731 2732 if (inner == -1) 2733 return; 2734 2735 DeclaratorChunk &chunk = D.getTypeObject(inner); 2736 if (chunk.Kind == DeclaratorChunk::Pointer) { 2737 if (declSpecTy->isObjCRetainableType()) 2738 return transferARCOwnershipToDeclSpec(S, declSpecTy, ownership); 2739 if (declSpecTy->isObjCObjectType() && hasIndirection) 2740 return transferARCOwnershipToDeclaratorChunk(state, ownership, inner); 2741 } else { 2742 assert(chunk.Kind == DeclaratorChunk::Array || 2743 chunk.Kind == DeclaratorChunk::Reference); 2744 return transferARCOwnershipToDeclSpec(S, declSpecTy, ownership); 2745 } 2746} 2747 2748TypeSourceInfo *Sema::GetTypeForDeclaratorCast(Declarator &D, QualType FromTy) { 2749 TypeProcessingState state(*this, D); 2750 2751 TypeSourceInfo *ReturnTypeInfo = 0; 2752 QualType declSpecTy = GetDeclSpecTypeForDeclarator(state, ReturnTypeInfo); 2753 if (declSpecTy.isNull()) 2754 return Context.getNullTypeSourceInfo(); 2755 2756 if (getLangOptions().ObjCAutoRefCount) { 2757 Qualifiers::ObjCLifetime ownership = Context.getInnerObjCOwnership(FromTy); 2758 if (ownership != Qualifiers::OCL_None) 2759 transferARCOwnership(state, declSpecTy, ownership); 2760 } 2761 2762 return GetFullTypeForDeclarator(state, declSpecTy, ReturnTypeInfo); 2763} 2764 2765/// Map an AttributedType::Kind to an AttributeList::Kind. 2766static AttributeList::Kind getAttrListKind(AttributedType::Kind kind) { 2767 switch (kind) { 2768 case AttributedType::attr_address_space: 2769 return AttributeList::AT_address_space; 2770 case AttributedType::attr_regparm: 2771 return AttributeList::AT_regparm; 2772 case AttributedType::attr_vector_size: 2773 return AttributeList::AT_vector_size; 2774 case AttributedType::attr_neon_vector_type: 2775 return AttributeList::AT_neon_vector_type; 2776 case AttributedType::attr_neon_polyvector_type: 2777 return AttributeList::AT_neon_polyvector_type; 2778 case AttributedType::attr_objc_gc: 2779 return AttributeList::AT_objc_gc; 2780 case AttributedType::attr_objc_ownership: 2781 return AttributeList::AT_objc_ownership; 2782 case AttributedType::attr_noreturn: 2783 return AttributeList::AT_noreturn; 2784 case AttributedType::attr_cdecl: 2785 return AttributeList::AT_cdecl; 2786 case AttributedType::attr_fastcall: 2787 return AttributeList::AT_fastcall; 2788 case AttributedType::attr_stdcall: 2789 return AttributeList::AT_stdcall; 2790 case AttributedType::attr_thiscall: 2791 return AttributeList::AT_thiscall; 2792 case AttributedType::attr_pascal: 2793 return AttributeList::AT_pascal; 2794 case AttributedType::attr_pcs: 2795 return AttributeList::AT_pcs; 2796 } 2797 llvm_unreachable("unexpected attribute kind!"); 2798} 2799 2800static void fillAttributedTypeLoc(AttributedTypeLoc TL, 2801 const AttributeList *attrs) { 2802 AttributedType::Kind kind = TL.getAttrKind(); 2803 2804 assert(attrs && "no type attributes in the expected location!"); 2805 AttributeList::Kind parsedKind = getAttrListKind(kind); 2806 while (attrs->getKind() != parsedKind) { 2807 attrs = attrs->getNext(); 2808 assert(attrs && "no matching attribute in expected location!"); 2809 } 2810 2811 TL.setAttrNameLoc(attrs->getLoc()); 2812 if (TL.hasAttrExprOperand()) 2813 TL.setAttrExprOperand(attrs->getArg(0)); 2814 else if (TL.hasAttrEnumOperand()) 2815 TL.setAttrEnumOperandLoc(attrs->getParameterLoc()); 2816 2817 // FIXME: preserve this information to here. 2818 if (TL.hasAttrOperand()) 2819 TL.setAttrOperandParensRange(SourceRange()); 2820} 2821 2822namespace { 2823 class TypeSpecLocFiller : public TypeLocVisitor<TypeSpecLocFiller> { 2824 ASTContext &Context; 2825 const DeclSpec &DS; 2826 2827 public: 2828 TypeSpecLocFiller(ASTContext &Context, const DeclSpec &DS) 2829 : Context(Context), DS(DS) {} 2830 2831 void VisitAttributedTypeLoc(AttributedTypeLoc TL) { 2832 fillAttributedTypeLoc(TL, DS.getAttributes().getList()); 2833 Visit(TL.getModifiedLoc()); 2834 } 2835 void VisitQualifiedTypeLoc(QualifiedTypeLoc TL) { 2836 Visit(TL.getUnqualifiedLoc()); 2837 } 2838 void VisitTypedefTypeLoc(TypedefTypeLoc TL) { 2839 TL.setNameLoc(DS.getTypeSpecTypeLoc()); 2840 } 2841 void VisitObjCInterfaceTypeLoc(ObjCInterfaceTypeLoc TL) { 2842 TL.setNameLoc(DS.getTypeSpecTypeLoc()); 2843 } 2844 void VisitObjCObjectTypeLoc(ObjCObjectTypeLoc TL) { 2845 // Handle the base type, which might not have been written explicitly. 2846 if (DS.getTypeSpecType() == DeclSpec::TST_unspecified) { 2847 TL.setHasBaseTypeAsWritten(false); 2848 TL.getBaseLoc().initialize(Context, SourceLocation()); 2849 } else { 2850 TL.setHasBaseTypeAsWritten(true); 2851 Visit(TL.getBaseLoc()); 2852 } 2853 2854 // Protocol qualifiers. 2855 if (DS.getProtocolQualifiers()) { 2856 assert(TL.getNumProtocols() > 0); 2857 assert(TL.getNumProtocols() == DS.getNumProtocolQualifiers()); 2858 TL.setLAngleLoc(DS.getProtocolLAngleLoc()); 2859 TL.setRAngleLoc(DS.getSourceRange().getEnd()); 2860 for (unsigned i = 0, e = DS.getNumProtocolQualifiers(); i != e; ++i) 2861 TL.setProtocolLoc(i, DS.getProtocolLocs()[i]); 2862 } else { 2863 assert(TL.getNumProtocols() == 0); 2864 TL.setLAngleLoc(SourceLocation()); 2865 TL.setRAngleLoc(SourceLocation()); 2866 } 2867 } 2868 void VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL) { 2869 TL.setStarLoc(SourceLocation()); 2870 Visit(TL.getPointeeLoc()); 2871 } 2872 void VisitTemplateSpecializationTypeLoc(TemplateSpecializationTypeLoc TL) { 2873 TypeSourceInfo *TInfo = 0; 2874 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 2875 2876 // If we got no declarator info from previous Sema routines, 2877 // just fill with the typespec loc. 2878 if (!TInfo) { 2879 TL.initialize(Context, DS.getTypeSpecTypeNameLoc()); 2880 return; 2881 } 2882 2883 TypeLoc OldTL = TInfo->getTypeLoc(); 2884 if (TInfo->getType()->getAs<ElaboratedType>()) { 2885 ElaboratedTypeLoc ElabTL = cast<ElaboratedTypeLoc>(OldTL); 2886 TemplateSpecializationTypeLoc NamedTL = 2887 cast<TemplateSpecializationTypeLoc>(ElabTL.getNamedTypeLoc()); 2888 TL.copy(NamedTL); 2889 } 2890 else 2891 TL.copy(cast<TemplateSpecializationTypeLoc>(OldTL)); 2892 } 2893 void VisitTypeOfExprTypeLoc(TypeOfExprTypeLoc TL) { 2894 assert(DS.getTypeSpecType() == DeclSpec::TST_typeofExpr); 2895 TL.setTypeofLoc(DS.getTypeSpecTypeLoc()); 2896 TL.setParensRange(DS.getTypeofParensRange()); 2897 } 2898 void VisitTypeOfTypeLoc(TypeOfTypeLoc TL) { 2899 assert(DS.getTypeSpecType() == DeclSpec::TST_typeofType); 2900 TL.setTypeofLoc(DS.getTypeSpecTypeLoc()); 2901 TL.setParensRange(DS.getTypeofParensRange()); 2902 assert(DS.getRepAsType()); 2903 TypeSourceInfo *TInfo = 0; 2904 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 2905 TL.setUnderlyingTInfo(TInfo); 2906 } 2907 void VisitUnaryTransformTypeLoc(UnaryTransformTypeLoc TL) { 2908 // FIXME: This holds only because we only have one unary transform. 2909 assert(DS.getTypeSpecType() == DeclSpec::TST_underlyingType); 2910 TL.setKWLoc(DS.getTypeSpecTypeLoc()); 2911 TL.setParensRange(DS.getTypeofParensRange()); 2912 assert(DS.getRepAsType()); 2913 TypeSourceInfo *TInfo = 0; 2914 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 2915 TL.setUnderlyingTInfo(TInfo); 2916 } 2917 void VisitBuiltinTypeLoc(BuiltinTypeLoc TL) { 2918 // By default, use the source location of the type specifier. 2919 TL.setBuiltinLoc(DS.getTypeSpecTypeLoc()); 2920 if (TL.needsExtraLocalData()) { 2921 // Set info for the written builtin specifiers. 2922 TL.getWrittenBuiltinSpecs() = DS.getWrittenBuiltinSpecs(); 2923 // Try to have a meaningful source location. 2924 if (TL.getWrittenSignSpec() != TSS_unspecified) 2925 // Sign spec loc overrides the others (e.g., 'unsigned long'). 2926 TL.setBuiltinLoc(DS.getTypeSpecSignLoc()); 2927 else if (TL.getWrittenWidthSpec() != TSW_unspecified) 2928 // Width spec loc overrides type spec loc (e.g., 'short int'). 2929 TL.setBuiltinLoc(DS.getTypeSpecWidthLoc()); 2930 } 2931 } 2932 void VisitElaboratedTypeLoc(ElaboratedTypeLoc TL) { 2933 ElaboratedTypeKeyword Keyword 2934 = TypeWithKeyword::getKeywordForTypeSpec(DS.getTypeSpecType()); 2935 if (DS.getTypeSpecType() == TST_typename) { 2936 TypeSourceInfo *TInfo = 0; 2937 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 2938 if (TInfo) { 2939 TL.copy(cast<ElaboratedTypeLoc>(TInfo->getTypeLoc())); 2940 return; 2941 } 2942 } 2943 TL.setElaboratedKeywordLoc(Keyword != ETK_None 2944 ? DS.getTypeSpecTypeLoc() 2945 : SourceLocation()); 2946 const CXXScopeSpec& SS = DS.getTypeSpecScope(); 2947 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 2948 Visit(TL.getNextTypeLoc().getUnqualifiedLoc()); 2949 } 2950 void VisitDependentNameTypeLoc(DependentNameTypeLoc TL) { 2951 assert(DS.getTypeSpecType() == TST_typename); 2952 TypeSourceInfo *TInfo = 0; 2953 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 2954 assert(TInfo); 2955 TL.copy(cast<DependentNameTypeLoc>(TInfo->getTypeLoc())); 2956 } 2957 void VisitDependentTemplateSpecializationTypeLoc( 2958 DependentTemplateSpecializationTypeLoc TL) { 2959 assert(DS.getTypeSpecType() == TST_typename); 2960 TypeSourceInfo *TInfo = 0; 2961 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 2962 assert(TInfo); 2963 TL.copy(cast<DependentTemplateSpecializationTypeLoc>( 2964 TInfo->getTypeLoc())); 2965 } 2966 void VisitTagTypeLoc(TagTypeLoc TL) { 2967 TL.setNameLoc(DS.getTypeSpecTypeNameLoc()); 2968 } 2969 void VisitAtomicTypeLoc(AtomicTypeLoc TL) { 2970 TL.setKWLoc(DS.getTypeSpecTypeLoc()); 2971 TL.setParensRange(DS.getTypeofParensRange()); 2972 2973 TypeSourceInfo *TInfo = 0; 2974 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 2975 TL.getValueLoc().initializeFullCopy(TInfo->getTypeLoc()); 2976 } 2977 2978 void VisitTypeLoc(TypeLoc TL) { 2979 // FIXME: add other typespec types and change this to an assert. 2980 TL.initialize(Context, DS.getTypeSpecTypeLoc()); 2981 } 2982 }; 2983 2984 class DeclaratorLocFiller : public TypeLocVisitor<DeclaratorLocFiller> { 2985 ASTContext &Context; 2986 const DeclaratorChunk &Chunk; 2987 2988 public: 2989 DeclaratorLocFiller(ASTContext &Context, const DeclaratorChunk &Chunk) 2990 : Context(Context), Chunk(Chunk) {} 2991 2992 void VisitQualifiedTypeLoc(QualifiedTypeLoc TL) { 2993 llvm_unreachable("qualified type locs not expected here!"); 2994 } 2995 2996 void VisitAttributedTypeLoc(AttributedTypeLoc TL) { 2997 fillAttributedTypeLoc(TL, Chunk.getAttrs()); 2998 } 2999 void VisitBlockPointerTypeLoc(BlockPointerTypeLoc TL) { 3000 assert(Chunk.Kind == DeclaratorChunk::BlockPointer); 3001 TL.setCaretLoc(Chunk.Loc); 3002 } 3003 void VisitPointerTypeLoc(PointerTypeLoc TL) { 3004 assert(Chunk.Kind == DeclaratorChunk::Pointer); 3005 TL.setStarLoc(Chunk.Loc); 3006 } 3007 void VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL) { 3008 assert(Chunk.Kind == DeclaratorChunk::Pointer); 3009 TL.setStarLoc(Chunk.Loc); 3010 } 3011 void VisitMemberPointerTypeLoc(MemberPointerTypeLoc TL) { 3012 assert(Chunk.Kind == DeclaratorChunk::MemberPointer); 3013 const CXXScopeSpec& SS = Chunk.Mem.Scope(); 3014 NestedNameSpecifierLoc NNSLoc = SS.getWithLocInContext(Context); 3015 3016 const Type* ClsTy = TL.getClass(); 3017 QualType ClsQT = QualType(ClsTy, 0); 3018 TypeSourceInfo *ClsTInfo = Context.CreateTypeSourceInfo(ClsQT, 0); 3019 // Now copy source location info into the type loc component. 3020 TypeLoc ClsTL = ClsTInfo->getTypeLoc(); 3021 switch (NNSLoc.getNestedNameSpecifier()->getKind()) { 3022 case NestedNameSpecifier::Identifier: 3023 assert(isa<DependentNameType>(ClsTy) && "Unexpected TypeLoc"); 3024 { 3025 DependentNameTypeLoc DNTLoc = cast<DependentNameTypeLoc>(ClsTL); 3026 DNTLoc.setElaboratedKeywordLoc(SourceLocation()); 3027 DNTLoc.setQualifierLoc(NNSLoc.getPrefix()); 3028 DNTLoc.setNameLoc(NNSLoc.getLocalBeginLoc()); 3029 } 3030 break; 3031 3032 case NestedNameSpecifier::TypeSpec: 3033 case NestedNameSpecifier::TypeSpecWithTemplate: 3034 if (isa<ElaboratedType>(ClsTy)) { 3035 ElaboratedTypeLoc ETLoc = *cast<ElaboratedTypeLoc>(&ClsTL); 3036 ETLoc.setElaboratedKeywordLoc(SourceLocation()); 3037 ETLoc.setQualifierLoc(NNSLoc.getPrefix()); 3038 TypeLoc NamedTL = ETLoc.getNamedTypeLoc(); 3039 NamedTL.initializeFullCopy(NNSLoc.getTypeLoc()); 3040 } else { 3041 ClsTL.initializeFullCopy(NNSLoc.getTypeLoc()); 3042 } 3043 break; 3044 3045 case NestedNameSpecifier::Namespace: 3046 case NestedNameSpecifier::NamespaceAlias: 3047 case NestedNameSpecifier::Global: 3048 llvm_unreachable("Nested-name-specifier must name a type"); 3049 } 3050 3051 // Finally fill in MemberPointerLocInfo fields. 3052 TL.setStarLoc(Chunk.Loc); 3053 TL.setClassTInfo(ClsTInfo); 3054 } 3055 void VisitLValueReferenceTypeLoc(LValueReferenceTypeLoc TL) { 3056 assert(Chunk.Kind == DeclaratorChunk::Reference); 3057 // 'Amp' is misleading: this might have been originally 3058 /// spelled with AmpAmp. 3059 TL.setAmpLoc(Chunk.Loc); 3060 } 3061 void VisitRValueReferenceTypeLoc(RValueReferenceTypeLoc TL) { 3062 assert(Chunk.Kind == DeclaratorChunk::Reference); 3063 assert(!Chunk.Ref.LValueRef); 3064 TL.setAmpAmpLoc(Chunk.Loc); 3065 } 3066 void VisitArrayTypeLoc(ArrayTypeLoc TL) { 3067 assert(Chunk.Kind == DeclaratorChunk::Array); 3068 TL.setLBracketLoc(Chunk.Loc); 3069 TL.setRBracketLoc(Chunk.EndLoc); 3070 TL.setSizeExpr(static_cast<Expr*>(Chunk.Arr.NumElts)); 3071 } 3072 void VisitFunctionTypeLoc(FunctionTypeLoc TL) { 3073 assert(Chunk.Kind == DeclaratorChunk::Function); 3074 TL.setLocalRangeBegin(Chunk.Loc); 3075 TL.setLocalRangeEnd(Chunk.EndLoc); 3076 TL.setTrailingReturn(!!Chunk.Fun.TrailingReturnType); 3077 3078 const DeclaratorChunk::FunctionTypeInfo &FTI = Chunk.Fun; 3079 for (unsigned i = 0, e = TL.getNumArgs(), tpi = 0; i != e; ++i) { 3080 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 3081 TL.setArg(tpi++, Param); 3082 } 3083 // FIXME: exception specs 3084 } 3085 void VisitParenTypeLoc(ParenTypeLoc TL) { 3086 assert(Chunk.Kind == DeclaratorChunk::Paren); 3087 TL.setLParenLoc(Chunk.Loc); 3088 TL.setRParenLoc(Chunk.EndLoc); 3089 } 3090 3091 void VisitTypeLoc(TypeLoc TL) { 3092 llvm_unreachable("unsupported TypeLoc kind in declarator!"); 3093 } 3094 }; 3095} 3096 3097/// \brief Create and instantiate a TypeSourceInfo with type source information. 3098/// 3099/// \param T QualType referring to the type as written in source code. 3100/// 3101/// \param ReturnTypeInfo For declarators whose return type does not show 3102/// up in the normal place in the declaration specifiers (such as a C++ 3103/// conversion function), this pointer will refer to a type source information 3104/// for that return type. 3105TypeSourceInfo * 3106Sema::GetTypeSourceInfoForDeclarator(Declarator &D, QualType T, 3107 TypeSourceInfo *ReturnTypeInfo) { 3108 TypeSourceInfo *TInfo = Context.CreateTypeSourceInfo(T); 3109 UnqualTypeLoc CurrTL = TInfo->getTypeLoc().getUnqualifiedLoc(); 3110 3111 // Handle parameter packs whose type is a pack expansion. 3112 if (isa<PackExpansionType>(T)) { 3113 cast<PackExpansionTypeLoc>(CurrTL).setEllipsisLoc(D.getEllipsisLoc()); 3114 CurrTL = CurrTL.getNextTypeLoc().getUnqualifiedLoc(); 3115 } 3116 3117 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 3118 while (isa<AttributedTypeLoc>(CurrTL)) { 3119 AttributedTypeLoc TL = cast<AttributedTypeLoc>(CurrTL); 3120 fillAttributedTypeLoc(TL, D.getTypeObject(i).getAttrs()); 3121 CurrTL = TL.getNextTypeLoc().getUnqualifiedLoc(); 3122 } 3123 3124 DeclaratorLocFiller(Context, D.getTypeObject(i)).Visit(CurrTL); 3125 CurrTL = CurrTL.getNextTypeLoc().getUnqualifiedLoc(); 3126 } 3127 3128 // If we have different source information for the return type, use 3129 // that. This really only applies to C++ conversion functions. 3130 if (ReturnTypeInfo) { 3131 TypeLoc TL = ReturnTypeInfo->getTypeLoc(); 3132 assert(TL.getFullDataSize() == CurrTL.getFullDataSize()); 3133 memcpy(CurrTL.getOpaqueData(), TL.getOpaqueData(), TL.getFullDataSize()); 3134 } else { 3135 TypeSpecLocFiller(Context, D.getDeclSpec()).Visit(CurrTL); 3136 } 3137 3138 return TInfo; 3139} 3140 3141/// \brief Create a LocInfoType to hold the given QualType and TypeSourceInfo. 3142ParsedType Sema::CreateParsedType(QualType T, TypeSourceInfo *TInfo) { 3143 // FIXME: LocInfoTypes are "transient", only needed for passing to/from Parser 3144 // and Sema during declaration parsing. Try deallocating/caching them when 3145 // it's appropriate, instead of allocating them and keeping them around. 3146 LocInfoType *LocT = (LocInfoType*)BumpAlloc.Allocate(sizeof(LocInfoType), 3147 TypeAlignment); 3148 new (LocT) LocInfoType(T, TInfo); 3149 assert(LocT->getTypeClass() != T->getTypeClass() && 3150 "LocInfoType's TypeClass conflicts with an existing Type class"); 3151 return ParsedType::make(QualType(LocT, 0)); 3152} 3153 3154void LocInfoType::getAsStringInternal(std::string &Str, 3155 const PrintingPolicy &Policy) const { 3156 llvm_unreachable("LocInfoType leaked into the type system; an opaque TypeTy*" 3157 " was used directly instead of getting the QualType through" 3158 " GetTypeFromParser"); 3159} 3160 3161TypeResult Sema::ActOnTypeName(Scope *S, Declarator &D) { 3162 // C99 6.7.6: Type names have no identifier. This is already validated by 3163 // the parser. 3164 assert(D.getIdentifier() == 0 && "Type name should have no identifier!"); 3165 3166 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 3167 QualType T = TInfo->getType(); 3168 if (D.isInvalidType()) 3169 return true; 3170 3171 // Make sure there are no unused decl attributes on the declarator. 3172 // We don't want to do this for ObjC parameters because we're going 3173 // to apply them to the actual parameter declaration. 3174 if (D.getContext() != Declarator::ObjCParameterContext) 3175 checkUnusedDeclAttributes(D); 3176 3177 if (getLangOptions().CPlusPlus) { 3178 // Check that there are no default arguments (C++ only). 3179 CheckExtraCXXDefaultArguments(D); 3180 } 3181 3182 return CreateParsedType(T, TInfo); 3183} 3184 3185ParsedType Sema::ActOnObjCInstanceType(SourceLocation Loc) { 3186 QualType T = Context.getObjCInstanceType(); 3187 TypeSourceInfo *TInfo = Context.getTrivialTypeSourceInfo(T, Loc); 3188 return CreateParsedType(T, TInfo); 3189} 3190 3191 3192//===----------------------------------------------------------------------===// 3193// Type Attribute Processing 3194//===----------------------------------------------------------------------===// 3195 3196/// HandleAddressSpaceTypeAttribute - Process an address_space attribute on the 3197/// specified type. The attribute contains 1 argument, the id of the address 3198/// space for the type. 3199static void HandleAddressSpaceTypeAttribute(QualType &Type, 3200 const AttributeList &Attr, Sema &S){ 3201 3202 // If this type is already address space qualified, reject it. 3203 // ISO/IEC TR 18037 S5.3 (amending C99 6.7.3): "No type shall be qualified by 3204 // qualifiers for two or more different address spaces." 3205 if (Type.getAddressSpace()) { 3206 S.Diag(Attr.getLoc(), diag::err_attribute_address_multiple_qualifiers); 3207 Attr.setInvalid(); 3208 return; 3209 } 3210 3211 // ISO/IEC TR 18037 S5.3 (amending C99 6.7.3): "A function type shall not be 3212 // qualified by an address-space qualifier." 3213 if (Type->isFunctionType()) { 3214 S.Diag(Attr.getLoc(), diag::err_attribute_address_function_type); 3215 Attr.setInvalid(); 3216 return; 3217 } 3218 3219 // Check the attribute arguments. 3220 if (Attr.getNumArgs() != 1) { 3221 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 3222 Attr.setInvalid(); 3223 return; 3224 } 3225 Expr *ASArgExpr = static_cast<Expr *>(Attr.getArg(0)); 3226 llvm::APSInt addrSpace(32); 3227 if (ASArgExpr->isTypeDependent() || ASArgExpr->isValueDependent() || 3228 !ASArgExpr->isIntegerConstantExpr(addrSpace, S.Context)) { 3229 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_not_int) 3230 << ASArgExpr->getSourceRange(); 3231 Attr.setInvalid(); 3232 return; 3233 } 3234 3235 // Bounds checking. 3236 if (addrSpace.isSigned()) { 3237 if (addrSpace.isNegative()) { 3238 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_negative) 3239 << ASArgExpr->getSourceRange(); 3240 Attr.setInvalid(); 3241 return; 3242 } 3243 addrSpace.setIsSigned(false); 3244 } 3245 llvm::APSInt max(addrSpace.getBitWidth()); 3246 max = Qualifiers::MaxAddressSpace; 3247 if (addrSpace > max) { 3248 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_too_high) 3249 << Qualifiers::MaxAddressSpace << ASArgExpr->getSourceRange(); 3250 Attr.setInvalid(); 3251 return; 3252 } 3253 3254 unsigned ASIdx = static_cast<unsigned>(addrSpace.getZExtValue()); 3255 Type = S.Context.getAddrSpaceQualType(Type, ASIdx); 3256} 3257 3258/// Does this type have a "direct" ownership qualifier? That is, 3259/// is it written like "__strong id", as opposed to something like 3260/// "typeof(foo)", where that happens to be strong? 3261static bool hasDirectOwnershipQualifier(QualType type) { 3262 // Fast path: no qualifier at all. 3263 assert(type.getQualifiers().hasObjCLifetime()); 3264 3265 while (true) { 3266 // __strong id 3267 if (const AttributedType *attr = dyn_cast<AttributedType>(type)) { 3268 if (attr->getAttrKind() == AttributedType::attr_objc_ownership) 3269 return true; 3270 3271 type = attr->getModifiedType(); 3272 3273 // X *__strong (...) 3274 } else if (const ParenType *paren = dyn_cast<ParenType>(type)) { 3275 type = paren->getInnerType(); 3276 3277 // That's it for things we want to complain about. In particular, 3278 // we do not want to look through typedefs, typeof(expr), 3279 // typeof(type), or any other way that the type is somehow 3280 // abstracted. 3281 } else { 3282 3283 return false; 3284 } 3285 } 3286} 3287 3288/// handleObjCOwnershipTypeAttr - Process an objc_ownership 3289/// attribute on the specified type. 3290/// 3291/// Returns 'true' if the attribute was handled. 3292static bool handleObjCOwnershipTypeAttr(TypeProcessingState &state, 3293 AttributeList &attr, 3294 QualType &type) { 3295 bool NonObjCPointer = false; 3296 3297 if (!type->isDependentType()) { 3298 if (const PointerType *ptr = type->getAs<PointerType>()) { 3299 QualType pointee = ptr->getPointeeType(); 3300 if (pointee->isObjCRetainableType() || pointee->isPointerType()) 3301 return false; 3302 // It is important not to lose the source info that there was an attribute 3303 // applied to non-objc pointer. We will create an attributed type but 3304 // its type will be the same as the original type. 3305 NonObjCPointer = true; 3306 } else if (!type->isObjCRetainableType()) { 3307 return false; 3308 } 3309 } 3310 3311 Sema &S = state.getSema(); 3312 SourceLocation AttrLoc = attr.getLoc(); 3313 if (AttrLoc.isMacroID()) 3314 AttrLoc = S.getSourceManager().getImmediateExpansionRange(AttrLoc).first; 3315 3316 if (!attr.getParameterName()) { 3317 S.Diag(AttrLoc, diag::err_attribute_argument_n_not_string) 3318 << "objc_ownership" << 1; 3319 attr.setInvalid(); 3320 return true; 3321 } 3322 3323 // Consume lifetime attributes without further comment outside of 3324 // ARC mode. 3325 if (!S.getLangOptions().ObjCAutoRefCount) 3326 return true; 3327 3328 Qualifiers::ObjCLifetime lifetime; 3329 if (attr.getParameterName()->isStr("none")) 3330 lifetime = Qualifiers::OCL_ExplicitNone; 3331 else if (attr.getParameterName()->isStr("strong")) 3332 lifetime = Qualifiers::OCL_Strong; 3333 else if (attr.getParameterName()->isStr("weak")) 3334 lifetime = Qualifiers::OCL_Weak; 3335 else if (attr.getParameterName()->isStr("autoreleasing")) 3336 lifetime = Qualifiers::OCL_Autoreleasing; 3337 else { 3338 S.Diag(AttrLoc, diag::warn_attribute_type_not_supported) 3339 << "objc_ownership" << attr.getParameterName(); 3340 attr.setInvalid(); 3341 return true; 3342 } 3343 3344 SplitQualType underlyingType = type.split(); 3345 3346 // Check for redundant/conflicting ownership qualifiers. 3347 if (Qualifiers::ObjCLifetime previousLifetime 3348 = type.getQualifiers().getObjCLifetime()) { 3349 // If it's written directly, that's an error. 3350 if (hasDirectOwnershipQualifier(type)) { 3351 S.Diag(AttrLoc, diag::err_attr_objc_ownership_redundant) 3352 << type; 3353 return true; 3354 } 3355 3356 // Otherwise, if the qualifiers actually conflict, pull sugar off 3357 // until we reach a type that is directly qualified. 3358 if (previousLifetime != lifetime) { 3359 // This should always terminate: the canonical type is 3360 // qualified, so some bit of sugar must be hiding it. 3361 while (!underlyingType.Quals.hasObjCLifetime()) { 3362 underlyingType = underlyingType.getSingleStepDesugaredType(); 3363 } 3364 underlyingType.Quals.removeObjCLifetime(); 3365 } 3366 } 3367 3368 underlyingType.Quals.addObjCLifetime(lifetime); 3369 3370 if (NonObjCPointer) { 3371 StringRef name = attr.getName()->getName(); 3372 switch (lifetime) { 3373 case Qualifiers::OCL_None: 3374 case Qualifiers::OCL_ExplicitNone: 3375 break; 3376 case Qualifiers::OCL_Strong: name = "__strong"; break; 3377 case Qualifiers::OCL_Weak: name = "__weak"; break; 3378 case Qualifiers::OCL_Autoreleasing: name = "__autoreleasing"; break; 3379 } 3380 S.Diag(AttrLoc, diag::warn_objc_object_attribute_wrong_type) 3381 << name << type; 3382 } 3383 3384 QualType origType = type; 3385 if (!NonObjCPointer) 3386 type = S.Context.getQualifiedType(underlyingType); 3387 3388 // If we have a valid source location for the attribute, use an 3389 // AttributedType instead. 3390 if (AttrLoc.isValid()) 3391 type = S.Context.getAttributedType(AttributedType::attr_objc_ownership, 3392 origType, type); 3393 3394 // Forbid __weak if the runtime doesn't support it. 3395 if (lifetime == Qualifiers::OCL_Weak && 3396 !S.getLangOptions().ObjCRuntimeHasWeak && !NonObjCPointer) { 3397 3398 // Actually, delay this until we know what we're parsing. 3399 if (S.DelayedDiagnostics.shouldDelayDiagnostics()) { 3400 S.DelayedDiagnostics.add( 3401 sema::DelayedDiagnostic::makeForbiddenType( 3402 S.getSourceManager().getExpansionLoc(AttrLoc), 3403 diag::err_arc_weak_no_runtime, type, /*ignored*/ 0)); 3404 } else { 3405 S.Diag(AttrLoc, diag::err_arc_weak_no_runtime); 3406 } 3407 3408 attr.setInvalid(); 3409 return true; 3410 } 3411 3412 // Forbid __weak for class objects marked as 3413 // objc_arc_weak_reference_unavailable 3414 if (lifetime == Qualifiers::OCL_Weak) { 3415 QualType T = type; 3416 while (const PointerType *ptr = T->getAs<PointerType>()) 3417 T = ptr->getPointeeType(); 3418 if (const ObjCObjectPointerType *ObjT = T->getAs<ObjCObjectPointerType>()) { 3419 ObjCInterfaceDecl *Class = ObjT->getInterfaceDecl(); 3420 if (Class->isArcWeakrefUnavailable()) { 3421 S.Diag(AttrLoc, diag::err_arc_unsupported_weak_class); 3422 S.Diag(ObjT->getInterfaceDecl()->getLocation(), 3423 diag::note_class_declared); 3424 } 3425 } 3426 } 3427 3428 return true; 3429} 3430 3431/// handleObjCGCTypeAttr - Process the __attribute__((objc_gc)) type 3432/// attribute on the specified type. Returns true to indicate that 3433/// the attribute was handled, false to indicate that the type does 3434/// not permit the attribute. 3435static bool handleObjCGCTypeAttr(TypeProcessingState &state, 3436 AttributeList &attr, 3437 QualType &type) { 3438 Sema &S = state.getSema(); 3439 3440 // Delay if this isn't some kind of pointer. 3441 if (!type->isPointerType() && 3442 !type->isObjCObjectPointerType() && 3443 !type->isBlockPointerType()) 3444 return false; 3445 3446 if (type.getObjCGCAttr() != Qualifiers::GCNone) { 3447 S.Diag(attr.getLoc(), diag::err_attribute_multiple_objc_gc); 3448 attr.setInvalid(); 3449 return true; 3450 } 3451 3452 // Check the attribute arguments. 3453 if (!attr.getParameterName()) { 3454 S.Diag(attr.getLoc(), diag::err_attribute_argument_n_not_string) 3455 << "objc_gc" << 1; 3456 attr.setInvalid(); 3457 return true; 3458 } 3459 Qualifiers::GC GCAttr; 3460 if (attr.getNumArgs() != 0) { 3461 S.Diag(attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 3462 attr.setInvalid(); 3463 return true; 3464 } 3465 if (attr.getParameterName()->isStr("weak")) 3466 GCAttr = Qualifiers::Weak; 3467 else if (attr.getParameterName()->isStr("strong")) 3468 GCAttr = Qualifiers::Strong; 3469 else { 3470 S.Diag(attr.getLoc(), diag::warn_attribute_type_not_supported) 3471 << "objc_gc" << attr.getParameterName(); 3472 attr.setInvalid(); 3473 return true; 3474 } 3475 3476 QualType origType = type; 3477 type = S.Context.getObjCGCQualType(origType, GCAttr); 3478 3479 // Make an attributed type to preserve the source information. 3480 if (attr.getLoc().isValid()) 3481 type = S.Context.getAttributedType(AttributedType::attr_objc_gc, 3482 origType, type); 3483 3484 return true; 3485} 3486 3487namespace { 3488 /// A helper class to unwrap a type down to a function for the 3489 /// purposes of applying attributes there. 3490 /// 3491 /// Use: 3492 /// FunctionTypeUnwrapper unwrapped(SemaRef, T); 3493 /// if (unwrapped.isFunctionType()) { 3494 /// const FunctionType *fn = unwrapped.get(); 3495 /// // change fn somehow 3496 /// T = unwrapped.wrap(fn); 3497 /// } 3498 struct FunctionTypeUnwrapper { 3499 enum WrapKind { 3500 Desugar, 3501 Parens, 3502 Pointer, 3503 BlockPointer, 3504 Reference, 3505 MemberPointer 3506 }; 3507 3508 QualType Original; 3509 const FunctionType *Fn; 3510 SmallVector<unsigned char /*WrapKind*/, 8> Stack; 3511 3512 FunctionTypeUnwrapper(Sema &S, QualType T) : Original(T) { 3513 while (true) { 3514 const Type *Ty = T.getTypePtr(); 3515 if (isa<FunctionType>(Ty)) { 3516 Fn = cast<FunctionType>(Ty); 3517 return; 3518 } else if (isa<ParenType>(Ty)) { 3519 T = cast<ParenType>(Ty)->getInnerType(); 3520 Stack.push_back(Parens); 3521 } else if (isa<PointerType>(Ty)) { 3522 T = cast<PointerType>(Ty)->getPointeeType(); 3523 Stack.push_back(Pointer); 3524 } else if (isa<BlockPointerType>(Ty)) { 3525 T = cast<BlockPointerType>(Ty)->getPointeeType(); 3526 Stack.push_back(BlockPointer); 3527 } else if (isa<MemberPointerType>(Ty)) { 3528 T = cast<MemberPointerType>(Ty)->getPointeeType(); 3529 Stack.push_back(MemberPointer); 3530 } else if (isa<ReferenceType>(Ty)) { 3531 T = cast<ReferenceType>(Ty)->getPointeeType(); 3532 Stack.push_back(Reference); 3533 } else { 3534 const Type *DTy = Ty->getUnqualifiedDesugaredType(); 3535 if (Ty == DTy) { 3536 Fn = 0; 3537 return; 3538 } 3539 3540 T = QualType(DTy, 0); 3541 Stack.push_back(Desugar); 3542 } 3543 } 3544 } 3545 3546 bool isFunctionType() const { return (Fn != 0); } 3547 const FunctionType *get() const { return Fn; } 3548 3549 QualType wrap(Sema &S, const FunctionType *New) { 3550 // If T wasn't modified from the unwrapped type, do nothing. 3551 if (New == get()) return Original; 3552 3553 Fn = New; 3554 return wrap(S.Context, Original, 0); 3555 } 3556 3557 private: 3558 QualType wrap(ASTContext &C, QualType Old, unsigned I) { 3559 if (I == Stack.size()) 3560 return C.getQualifiedType(Fn, Old.getQualifiers()); 3561 3562 // Build up the inner type, applying the qualifiers from the old 3563 // type to the new type. 3564 SplitQualType SplitOld = Old.split(); 3565 3566 // As a special case, tail-recurse if there are no qualifiers. 3567 if (SplitOld.Quals.empty()) 3568 return wrap(C, SplitOld.Ty, I); 3569 return C.getQualifiedType(wrap(C, SplitOld.Ty, I), SplitOld.Quals); 3570 } 3571 3572 QualType wrap(ASTContext &C, const Type *Old, unsigned I) { 3573 if (I == Stack.size()) return QualType(Fn, 0); 3574 3575 switch (static_cast<WrapKind>(Stack[I++])) { 3576 case Desugar: 3577 // This is the point at which we potentially lose source 3578 // information. 3579 return wrap(C, Old->getUnqualifiedDesugaredType(), I); 3580 3581 case Parens: { 3582 QualType New = wrap(C, cast<ParenType>(Old)->getInnerType(), I); 3583 return C.getParenType(New); 3584 } 3585 3586 case Pointer: { 3587 QualType New = wrap(C, cast<PointerType>(Old)->getPointeeType(), I); 3588 return C.getPointerType(New); 3589 } 3590 3591 case BlockPointer: { 3592 QualType New = wrap(C, cast<BlockPointerType>(Old)->getPointeeType(),I); 3593 return C.getBlockPointerType(New); 3594 } 3595 3596 case MemberPointer: { 3597 const MemberPointerType *OldMPT = cast<MemberPointerType>(Old); 3598 QualType New = wrap(C, OldMPT->getPointeeType(), I); 3599 return C.getMemberPointerType(New, OldMPT->getClass()); 3600 } 3601 3602 case Reference: { 3603 const ReferenceType *OldRef = cast<ReferenceType>(Old); 3604 QualType New = wrap(C, OldRef->getPointeeType(), I); 3605 if (isa<LValueReferenceType>(OldRef)) 3606 return C.getLValueReferenceType(New, OldRef->isSpelledAsLValue()); 3607 else 3608 return C.getRValueReferenceType(New); 3609 } 3610 } 3611 3612 llvm_unreachable("unknown wrapping kind"); 3613 } 3614 }; 3615} 3616 3617/// Process an individual function attribute. Returns true to 3618/// indicate that the attribute was handled, false if it wasn't. 3619static bool handleFunctionTypeAttr(TypeProcessingState &state, 3620 AttributeList &attr, 3621 QualType &type) { 3622 Sema &S = state.getSema(); 3623 3624 FunctionTypeUnwrapper unwrapped(S, type); 3625 3626 if (attr.getKind() == AttributeList::AT_noreturn) { 3627 if (S.CheckNoReturnAttr(attr)) 3628 return true; 3629 3630 // Delay if this is not a function type. 3631 if (!unwrapped.isFunctionType()) 3632 return false; 3633 3634 // Otherwise we can process right away. 3635 FunctionType::ExtInfo EI = unwrapped.get()->getExtInfo().withNoReturn(true); 3636 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 3637 return true; 3638 } 3639 3640 // ns_returns_retained is not always a type attribute, but if we got 3641 // here, we're treating it as one right now. 3642 if (attr.getKind() == AttributeList::AT_ns_returns_retained) { 3643 assert(S.getLangOptions().ObjCAutoRefCount && 3644 "ns_returns_retained treated as type attribute in non-ARC"); 3645 if (attr.getNumArgs()) return true; 3646 3647 // Delay if this is not a function type. 3648 if (!unwrapped.isFunctionType()) 3649 return false; 3650 3651 FunctionType::ExtInfo EI 3652 = unwrapped.get()->getExtInfo().withProducesResult(true); 3653 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 3654 return true; 3655 } 3656 3657 if (attr.getKind() == AttributeList::AT_regparm) { 3658 unsigned value; 3659 if (S.CheckRegparmAttr(attr, value)) 3660 return true; 3661 3662 // Delay if this is not a function type. 3663 if (!unwrapped.isFunctionType()) 3664 return false; 3665 3666 // Diagnose regparm with fastcall. 3667 const FunctionType *fn = unwrapped.get(); 3668 CallingConv CC = fn->getCallConv(); 3669 if (CC == CC_X86FastCall) { 3670 S.Diag(attr.getLoc(), diag::err_attributes_are_not_compatible) 3671 << FunctionType::getNameForCallConv(CC) 3672 << "regparm"; 3673 attr.setInvalid(); 3674 return true; 3675 } 3676 3677 FunctionType::ExtInfo EI = 3678 unwrapped.get()->getExtInfo().withRegParm(value); 3679 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 3680 return true; 3681 } 3682 3683 // Otherwise, a calling convention. 3684 CallingConv CC; 3685 if (S.CheckCallingConvAttr(attr, CC)) 3686 return true; 3687 3688 // Delay if the type didn't work out to a function. 3689 if (!unwrapped.isFunctionType()) return false; 3690 3691 const FunctionType *fn = unwrapped.get(); 3692 CallingConv CCOld = fn->getCallConv(); 3693 if (S.Context.getCanonicalCallConv(CC) == 3694 S.Context.getCanonicalCallConv(CCOld)) { 3695 FunctionType::ExtInfo EI= unwrapped.get()->getExtInfo().withCallingConv(CC); 3696 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 3697 return true; 3698 } 3699 3700 if (CCOld != (S.LangOpts.MRTD ? CC_X86StdCall : CC_Default)) { 3701 // Should we diagnose reapplications of the same convention? 3702 S.Diag(attr.getLoc(), diag::err_attributes_are_not_compatible) 3703 << FunctionType::getNameForCallConv(CC) 3704 << FunctionType::getNameForCallConv(CCOld); 3705 attr.setInvalid(); 3706 return true; 3707 } 3708 3709 // Diagnose the use of X86 fastcall on varargs or unprototyped functions. 3710 if (CC == CC_X86FastCall) { 3711 if (isa<FunctionNoProtoType>(fn)) { 3712 S.Diag(attr.getLoc(), diag::err_cconv_knr) 3713 << FunctionType::getNameForCallConv(CC); 3714 attr.setInvalid(); 3715 return true; 3716 } 3717 3718 const FunctionProtoType *FnP = cast<FunctionProtoType>(fn); 3719 if (FnP->isVariadic()) { 3720 S.Diag(attr.getLoc(), diag::err_cconv_varargs) 3721 << FunctionType::getNameForCallConv(CC); 3722 attr.setInvalid(); 3723 return true; 3724 } 3725 3726 // Also diagnose fastcall with regparm. 3727 if (fn->getHasRegParm()) { 3728 S.Diag(attr.getLoc(), diag::err_attributes_are_not_compatible) 3729 << "regparm" 3730 << FunctionType::getNameForCallConv(CC); 3731 attr.setInvalid(); 3732 return true; 3733 } 3734 } 3735 3736 FunctionType::ExtInfo EI = unwrapped.get()->getExtInfo().withCallingConv(CC); 3737 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 3738 return true; 3739} 3740 3741/// Handle OpenCL image access qualifiers: read_only, write_only, read_write 3742static void HandleOpenCLImageAccessAttribute(QualType& CurType, 3743 const AttributeList &Attr, 3744 Sema &S) { 3745 // Check the attribute arguments. 3746 if (Attr.getNumArgs() != 1) { 3747 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 3748 Attr.setInvalid(); 3749 return; 3750 } 3751 Expr *sizeExpr = static_cast<Expr *>(Attr.getArg(0)); 3752 llvm::APSInt arg(32); 3753 if (sizeExpr->isTypeDependent() || sizeExpr->isValueDependent() || 3754 !sizeExpr->isIntegerConstantExpr(arg, S.Context)) { 3755 S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int) 3756 << "opencl_image_access" << sizeExpr->getSourceRange(); 3757 Attr.setInvalid(); 3758 return; 3759 } 3760 unsigned iarg = static_cast<unsigned>(arg.getZExtValue()); 3761 switch (iarg) { 3762 case CLIA_read_only: 3763 case CLIA_write_only: 3764 case CLIA_read_write: 3765 // Implemented in a separate patch 3766 break; 3767 default: 3768 // Implemented in a separate patch 3769 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_size) 3770 << sizeExpr->getSourceRange(); 3771 Attr.setInvalid(); 3772 break; 3773 } 3774} 3775 3776/// HandleVectorSizeAttribute - this attribute is only applicable to integral 3777/// and float scalars, although arrays, pointers, and function return values are 3778/// allowed in conjunction with this construct. Aggregates with this attribute 3779/// are invalid, even if they are of the same size as a corresponding scalar. 3780/// The raw attribute should contain precisely 1 argument, the vector size for 3781/// the variable, measured in bytes. If curType and rawAttr are well formed, 3782/// this routine will return a new vector type. 3783static void HandleVectorSizeAttr(QualType& CurType, const AttributeList &Attr, 3784 Sema &S) { 3785 // Check the attribute arguments. 3786 if (Attr.getNumArgs() != 1) { 3787 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 3788 Attr.setInvalid(); 3789 return; 3790 } 3791 Expr *sizeExpr = static_cast<Expr *>(Attr.getArg(0)); 3792 llvm::APSInt vecSize(32); 3793 if (sizeExpr->isTypeDependent() || sizeExpr->isValueDependent() || 3794 !sizeExpr->isIntegerConstantExpr(vecSize, S.Context)) { 3795 S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int) 3796 << "vector_size" << sizeExpr->getSourceRange(); 3797 Attr.setInvalid(); 3798 return; 3799 } 3800 // the base type must be integer or float, and can't already be a vector. 3801 if (!CurType->isIntegerType() && !CurType->isRealFloatingType()) { 3802 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_vector_type) << CurType; 3803 Attr.setInvalid(); 3804 return; 3805 } 3806 unsigned typeSize = static_cast<unsigned>(S.Context.getTypeSize(CurType)); 3807 // vecSize is specified in bytes - convert to bits. 3808 unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue() * 8); 3809 3810 // the vector size needs to be an integral multiple of the type size. 3811 if (vectorSize % typeSize) { 3812 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_size) 3813 << sizeExpr->getSourceRange(); 3814 Attr.setInvalid(); 3815 return; 3816 } 3817 if (vectorSize == 0) { 3818 S.Diag(Attr.getLoc(), diag::err_attribute_zero_size) 3819 << sizeExpr->getSourceRange(); 3820 Attr.setInvalid(); 3821 return; 3822 } 3823 3824 // Success! Instantiate the vector type, the number of elements is > 0, and 3825 // not required to be a power of 2, unlike GCC. 3826 CurType = S.Context.getVectorType(CurType, vectorSize/typeSize, 3827 VectorType::GenericVector); 3828} 3829 3830/// \brief Process the OpenCL-like ext_vector_type attribute when it occurs on 3831/// a type. 3832static void HandleExtVectorTypeAttr(QualType &CurType, 3833 const AttributeList &Attr, 3834 Sema &S) { 3835 Expr *sizeExpr; 3836 3837 // Special case where the argument is a template id. 3838 if (Attr.getParameterName()) { 3839 CXXScopeSpec SS; 3840 SourceLocation TemplateKWLoc; 3841 UnqualifiedId id; 3842 id.setIdentifier(Attr.getParameterName(), Attr.getLoc()); 3843 3844 ExprResult Size = S.ActOnIdExpression(S.getCurScope(), SS, TemplateKWLoc, 3845 id, false, false); 3846 if (Size.isInvalid()) 3847 return; 3848 3849 sizeExpr = Size.get(); 3850 } else { 3851 // check the attribute arguments. 3852 if (Attr.getNumArgs() != 1) { 3853 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 3854 return; 3855 } 3856 sizeExpr = Attr.getArg(0); 3857 } 3858 3859 // Create the vector type. 3860 QualType T = S.BuildExtVectorType(CurType, sizeExpr, Attr.getLoc()); 3861 if (!T.isNull()) 3862 CurType = T; 3863} 3864 3865/// HandleNeonVectorTypeAttr - The "neon_vector_type" and 3866/// "neon_polyvector_type" attributes are used to create vector types that 3867/// are mangled according to ARM's ABI. Otherwise, these types are identical 3868/// to those created with the "vector_size" attribute. Unlike "vector_size" 3869/// the argument to these Neon attributes is the number of vector elements, 3870/// not the vector size in bytes. The vector width and element type must 3871/// match one of the standard Neon vector types. 3872static void HandleNeonVectorTypeAttr(QualType& CurType, 3873 const AttributeList &Attr, Sema &S, 3874 VectorType::VectorKind VecKind, 3875 const char *AttrName) { 3876 // Check the attribute arguments. 3877 if (Attr.getNumArgs() != 1) { 3878 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 3879 Attr.setInvalid(); 3880 return; 3881 } 3882 // The number of elements must be an ICE. 3883 Expr *numEltsExpr = static_cast<Expr *>(Attr.getArg(0)); 3884 llvm::APSInt numEltsInt(32); 3885 if (numEltsExpr->isTypeDependent() || numEltsExpr->isValueDependent() || 3886 !numEltsExpr->isIntegerConstantExpr(numEltsInt, S.Context)) { 3887 S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int) 3888 << AttrName << numEltsExpr->getSourceRange(); 3889 Attr.setInvalid(); 3890 return; 3891 } 3892 // Only certain element types are supported for Neon vectors. 3893 const BuiltinType* BTy = CurType->getAs<BuiltinType>(); 3894 if (!BTy || 3895 (VecKind == VectorType::NeonPolyVector && 3896 BTy->getKind() != BuiltinType::SChar && 3897 BTy->getKind() != BuiltinType::Short) || 3898 (BTy->getKind() != BuiltinType::SChar && 3899 BTy->getKind() != BuiltinType::UChar && 3900 BTy->getKind() != BuiltinType::Short && 3901 BTy->getKind() != BuiltinType::UShort && 3902 BTy->getKind() != BuiltinType::Int && 3903 BTy->getKind() != BuiltinType::UInt && 3904 BTy->getKind() != BuiltinType::LongLong && 3905 BTy->getKind() != BuiltinType::ULongLong && 3906 BTy->getKind() != BuiltinType::Float)) { 3907 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_vector_type) <<CurType; 3908 Attr.setInvalid(); 3909 return; 3910 } 3911 // The total size of the vector must be 64 or 128 bits. 3912 unsigned typeSize = static_cast<unsigned>(S.Context.getTypeSize(CurType)); 3913 unsigned numElts = static_cast<unsigned>(numEltsInt.getZExtValue()); 3914 unsigned vecSize = typeSize * numElts; 3915 if (vecSize != 64 && vecSize != 128) { 3916 S.Diag(Attr.getLoc(), diag::err_attribute_bad_neon_vector_size) << CurType; 3917 Attr.setInvalid(); 3918 return; 3919 } 3920 3921 CurType = S.Context.getVectorType(CurType, numElts, VecKind); 3922} 3923 3924static void processTypeAttrs(TypeProcessingState &state, QualType &type, 3925 bool isDeclSpec, AttributeList *attrs) { 3926 // Scan through and apply attributes to this type where it makes sense. Some 3927 // attributes (such as __address_space__, __vector_size__, etc) apply to the 3928 // type, but others can be present in the type specifiers even though they 3929 // apply to the decl. Here we apply type attributes and ignore the rest. 3930 3931 AttributeList *next; 3932 do { 3933 AttributeList &attr = *attrs; 3934 next = attr.getNext(); 3935 3936 // Skip attributes that were marked to be invalid. 3937 if (attr.isInvalid()) 3938 continue; 3939 3940 // If this is an attribute we can handle, do so now, 3941 // otherwise, add it to the FnAttrs list for rechaining. 3942 switch (attr.getKind()) { 3943 default: break; 3944 3945 case AttributeList::AT_may_alias: 3946 // FIXME: This attribute needs to actually be handled, but if we ignore 3947 // it it breaks large amounts of Linux software. 3948 attr.setUsedAsTypeAttr(); 3949 break; 3950 case AttributeList::AT_address_space: 3951 HandleAddressSpaceTypeAttribute(type, attr, state.getSema()); 3952 attr.setUsedAsTypeAttr(); 3953 break; 3954 OBJC_POINTER_TYPE_ATTRS_CASELIST: 3955 if (!handleObjCPointerTypeAttr(state, attr, type)) 3956 distributeObjCPointerTypeAttr(state, attr, type); 3957 attr.setUsedAsTypeAttr(); 3958 break; 3959 case AttributeList::AT_vector_size: 3960 HandleVectorSizeAttr(type, attr, state.getSema()); 3961 attr.setUsedAsTypeAttr(); 3962 break; 3963 case AttributeList::AT_ext_vector_type: 3964 if (state.getDeclarator().getDeclSpec().getStorageClassSpec() 3965 != DeclSpec::SCS_typedef) 3966 HandleExtVectorTypeAttr(type, attr, state.getSema()); 3967 attr.setUsedAsTypeAttr(); 3968 break; 3969 case AttributeList::AT_neon_vector_type: 3970 HandleNeonVectorTypeAttr(type, attr, state.getSema(), 3971 VectorType::NeonVector, "neon_vector_type"); 3972 attr.setUsedAsTypeAttr(); 3973 break; 3974 case AttributeList::AT_neon_polyvector_type: 3975 HandleNeonVectorTypeAttr(type, attr, state.getSema(), 3976 VectorType::NeonPolyVector, 3977 "neon_polyvector_type"); 3978 attr.setUsedAsTypeAttr(); 3979 break; 3980 case AttributeList::AT_opencl_image_access: 3981 HandleOpenCLImageAccessAttribute(type, attr, state.getSema()); 3982 attr.setUsedAsTypeAttr(); 3983 break; 3984 3985 case AttributeList::AT_ns_returns_retained: 3986 if (!state.getSema().getLangOptions().ObjCAutoRefCount) 3987 break; 3988 // fallthrough into the function attrs 3989 3990 FUNCTION_TYPE_ATTRS_CASELIST: 3991 attr.setUsedAsTypeAttr(); 3992 3993 // Never process function type attributes as part of the 3994 // declaration-specifiers. 3995 if (isDeclSpec) 3996 distributeFunctionTypeAttrFromDeclSpec(state, attr, type); 3997 3998 // Otherwise, handle the possible delays. 3999 else if (!handleFunctionTypeAttr(state, attr, type)) 4000 distributeFunctionTypeAttr(state, attr, type); 4001 break; 4002 } 4003 } while ((attrs = next)); 4004} 4005 4006/// \brief Ensure that the type of the given expression is complete. 4007/// 4008/// This routine checks whether the expression \p E has a complete type. If the 4009/// expression refers to an instantiable construct, that instantiation is 4010/// performed as needed to complete its type. Furthermore 4011/// Sema::RequireCompleteType is called for the expression's type (or in the 4012/// case of a reference type, the referred-to type). 4013/// 4014/// \param E The expression whose type is required to be complete. 4015/// \param PD The partial diagnostic that will be printed out if the type cannot 4016/// be completed. 4017/// 4018/// \returns \c true if the type of \p E is incomplete and diagnosed, \c false 4019/// otherwise. 4020bool Sema::RequireCompleteExprType(Expr *E, const PartialDiagnostic &PD, 4021 std::pair<SourceLocation, 4022 PartialDiagnostic> Note) { 4023 QualType T = E->getType(); 4024 4025 // Fast path the case where the type is already complete. 4026 if (!T->isIncompleteType()) 4027 return false; 4028 4029 // Incomplete array types may be completed by the initializer attached to 4030 // their definitions. For static data members of class templates we need to 4031 // instantiate the definition to get this initializer and complete the type. 4032 if (T->isIncompleteArrayType()) { 4033 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E->IgnoreParens())) { 4034 if (VarDecl *Var = dyn_cast<VarDecl>(DRE->getDecl())) { 4035 if (Var->isStaticDataMember() && 4036 Var->getInstantiatedFromStaticDataMember()) { 4037 4038 MemberSpecializationInfo *MSInfo = Var->getMemberSpecializationInfo(); 4039 assert(MSInfo && "Missing member specialization information?"); 4040 if (MSInfo->getTemplateSpecializationKind() 4041 != TSK_ExplicitSpecialization) { 4042 // If we don't already have a point of instantiation, this is it. 4043 if (MSInfo->getPointOfInstantiation().isInvalid()) { 4044 MSInfo->setPointOfInstantiation(E->getLocStart()); 4045 4046 // This is a modification of an existing AST node. Notify 4047 // listeners. 4048 if (ASTMutationListener *L = getASTMutationListener()) 4049 L->StaticDataMemberInstantiated(Var); 4050 } 4051 4052 InstantiateStaticDataMemberDefinition(E->getExprLoc(), Var); 4053 4054 // Update the type to the newly instantiated definition's type both 4055 // here and within the expression. 4056 if (VarDecl *Def = Var->getDefinition()) { 4057 DRE->setDecl(Def); 4058 T = Def->getType(); 4059 DRE->setType(T); 4060 E->setType(T); 4061 } 4062 } 4063 4064 // We still go on to try to complete the type independently, as it 4065 // may also require instantiations or diagnostics if it remains 4066 // incomplete. 4067 } 4068 } 4069 } 4070 } 4071 4072 // FIXME: Are there other cases which require instantiating something other 4073 // than the type to complete the type of an expression? 4074 4075 // Look through reference types and complete the referred type. 4076 if (const ReferenceType *Ref = T->getAs<ReferenceType>()) 4077 T = Ref->getPointeeType(); 4078 4079 return RequireCompleteType(E->getExprLoc(), T, PD, Note); 4080} 4081 4082/// @brief Ensure that the type T is a complete type. 4083/// 4084/// This routine checks whether the type @p T is complete in any 4085/// context where a complete type is required. If @p T is a complete 4086/// type, returns false. If @p T is a class template specialization, 4087/// this routine then attempts to perform class template 4088/// instantiation. If instantiation fails, or if @p T is incomplete 4089/// and cannot be completed, issues the diagnostic @p diag (giving it 4090/// the type @p T) and returns true. 4091/// 4092/// @param Loc The location in the source that the incomplete type 4093/// diagnostic should refer to. 4094/// 4095/// @param T The type that this routine is examining for completeness. 4096/// 4097/// @param PD The partial diagnostic that will be printed out if T is not a 4098/// complete type. 4099/// 4100/// @returns @c true if @p T is incomplete and a diagnostic was emitted, 4101/// @c false otherwise. 4102bool Sema::RequireCompleteType(SourceLocation Loc, QualType T, 4103 const PartialDiagnostic &PD, 4104 std::pair<SourceLocation, 4105 PartialDiagnostic> Note) { 4106 unsigned diag = PD.getDiagID(); 4107 4108 // FIXME: Add this assertion to make sure we always get instantiation points. 4109 // assert(!Loc.isInvalid() && "Invalid location in RequireCompleteType"); 4110 // FIXME: Add this assertion to help us flush out problems with 4111 // checking for dependent types and type-dependent expressions. 4112 // 4113 // assert(!T->isDependentType() && 4114 // "Can't ask whether a dependent type is complete"); 4115 4116 // If we have a complete type, we're done. 4117 NamedDecl *Def = 0; 4118 if (!T->isIncompleteType(&Def)) { 4119 // If we know about the definition but it is not visible, complain. 4120 if (diag != 0 && Def && !LookupResult::isVisible(Def)) { 4121 // Suppress this error outside of a SFINAE context if we've already 4122 // emitted the error once for this type. There's no usefulness in 4123 // repeating the diagnostic. 4124 // FIXME: Add a Fix-It that imports the corresponding module or includes 4125 // the header. 4126 if (isSFINAEContext() || HiddenDefinitions.insert(Def)) { 4127 Diag(Loc, diag::err_module_private_definition) << T; 4128 Diag(Def->getLocation(), diag::note_previous_definition); 4129 } 4130 } 4131 4132 return false; 4133 } 4134 4135 const TagType *Tag = T->getAs<TagType>(); 4136 const ObjCInterfaceType *IFace = 0; 4137 4138 if (Tag) { 4139 // Avoid diagnosing invalid decls as incomplete. 4140 if (Tag->getDecl()->isInvalidDecl()) 4141 return true; 4142 4143 // Give the external AST source a chance to complete the type. 4144 if (Tag->getDecl()->hasExternalLexicalStorage()) { 4145 Context.getExternalSource()->CompleteType(Tag->getDecl()); 4146 if (!Tag->isIncompleteType()) 4147 return false; 4148 } 4149 } 4150 else if ((IFace = T->getAs<ObjCInterfaceType>())) { 4151 // Avoid diagnosing invalid decls as incomplete. 4152 if (IFace->getDecl()->isInvalidDecl()) 4153 return true; 4154 4155 // Give the external AST source a chance to complete the type. 4156 if (IFace->getDecl()->hasExternalLexicalStorage()) { 4157 Context.getExternalSource()->CompleteType(IFace->getDecl()); 4158 if (!IFace->isIncompleteType()) 4159 return false; 4160 } 4161 } 4162 4163 // If we have a class template specialization or a class member of a 4164 // class template specialization, or an array with known size of such, 4165 // try to instantiate it. 4166 QualType MaybeTemplate = T; 4167 if (const ConstantArrayType *Array = Context.getAsConstantArrayType(T)) 4168 MaybeTemplate = Array->getElementType(); 4169 if (const RecordType *Record = MaybeTemplate->getAs<RecordType>()) { 4170 if (ClassTemplateSpecializationDecl *ClassTemplateSpec 4171 = dyn_cast<ClassTemplateSpecializationDecl>(Record->getDecl())) { 4172 if (ClassTemplateSpec->getSpecializationKind() == TSK_Undeclared) 4173 return InstantiateClassTemplateSpecialization(Loc, ClassTemplateSpec, 4174 TSK_ImplicitInstantiation, 4175 /*Complain=*/diag != 0); 4176 } else if (CXXRecordDecl *Rec 4177 = dyn_cast<CXXRecordDecl>(Record->getDecl())) { 4178 if (CXXRecordDecl *Pattern = Rec->getInstantiatedFromMemberClass()) { 4179 MemberSpecializationInfo *MSInfo = Rec->getMemberSpecializationInfo(); 4180 assert(MSInfo && "Missing member specialization information?"); 4181 // This record was instantiated from a class within a template. 4182 if (MSInfo->getTemplateSpecializationKind() 4183 != TSK_ExplicitSpecialization) 4184 return InstantiateClass(Loc, Rec, Pattern, 4185 getTemplateInstantiationArgs(Rec), 4186 TSK_ImplicitInstantiation, 4187 /*Complain=*/diag != 0); 4188 } 4189 } 4190 } 4191 4192 if (diag == 0) 4193 return true; 4194 4195 // We have an incomplete type. Produce a diagnostic. 4196 Diag(Loc, PD) << T; 4197 4198 // If we have a note, produce it. 4199 if (!Note.first.isInvalid()) 4200 Diag(Note.first, Note.second); 4201 4202 // If the type was a forward declaration of a class/struct/union 4203 // type, produce a note. 4204 if (Tag && !Tag->getDecl()->isInvalidDecl()) 4205 Diag(Tag->getDecl()->getLocation(), 4206 Tag->isBeingDefined() ? diag::note_type_being_defined 4207 : diag::note_forward_declaration) 4208 << QualType(Tag, 0); 4209 4210 // If the Objective-C class was a forward declaration, produce a note. 4211 if (IFace && !IFace->getDecl()->isInvalidDecl()) 4212 Diag(IFace->getDecl()->getLocation(), diag::note_forward_class); 4213 4214 return true; 4215} 4216 4217bool Sema::RequireCompleteType(SourceLocation Loc, QualType T, 4218 const PartialDiagnostic &PD) { 4219 return RequireCompleteType(Loc, T, PD, 4220 std::make_pair(SourceLocation(), PDiag(0))); 4221} 4222 4223bool Sema::RequireCompleteType(SourceLocation Loc, QualType T, 4224 unsigned DiagID) { 4225 return RequireCompleteType(Loc, T, PDiag(DiagID), 4226 std::make_pair(SourceLocation(), PDiag(0))); 4227} 4228 4229/// @brief Ensure that the type T is a literal type. 4230/// 4231/// This routine checks whether the type @p T is a literal type. If @p T is an 4232/// incomplete type, an attempt is made to complete it. If @p T is a literal 4233/// type, or @p AllowIncompleteType is true and @p T is an incomplete type, 4234/// returns false. Otherwise, this routine issues the diagnostic @p PD (giving 4235/// it the type @p T), along with notes explaining why the type is not a 4236/// literal type, and returns true. 4237/// 4238/// @param Loc The location in the source that the non-literal type 4239/// diagnostic should refer to. 4240/// 4241/// @param T The type that this routine is examining for literalness. 4242/// 4243/// @param PD The partial diagnostic that will be printed out if T is not a 4244/// literal type. 4245/// 4246/// @param AllowIncompleteType If true, an incomplete type will be considered 4247/// acceptable. 4248/// 4249/// @returns @c true if @p T is not a literal type and a diagnostic was emitted, 4250/// @c false otherwise. 4251bool Sema::RequireLiteralType(SourceLocation Loc, QualType T, 4252 const PartialDiagnostic &PD, 4253 bool AllowIncompleteType) { 4254 assert(!T->isDependentType() && "type should not be dependent"); 4255 4256 bool Incomplete = RequireCompleteType(Loc, T, 0); 4257 if (T->isLiteralType() || 4258 (AllowIncompleteType && Incomplete && !T->isVoidType())) 4259 return false; 4260 4261 if (PD.getDiagID() == 0) 4262 return true; 4263 4264 Diag(Loc, PD) << T; 4265 4266 if (T->isVariableArrayType()) 4267 return true; 4268 4269 const RecordType *RT = T->getBaseElementTypeUnsafe()->getAs<RecordType>(); 4270 if (!RT) 4271 return true; 4272 4273 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 4274 4275 // If the class has virtual base classes, then it's not an aggregate, and 4276 // cannot have any constexpr constructors, so is non-literal. This is better 4277 // to diagnose than the resulting absence of constexpr constructors. 4278 if (RD->getNumVBases()) { 4279 Diag(RD->getLocation(), diag::note_non_literal_virtual_base) 4280 << RD->isStruct() << RD->getNumVBases(); 4281 for (CXXRecordDecl::base_class_const_iterator I = RD->vbases_begin(), 4282 E = RD->vbases_end(); I != E; ++I) 4283 Diag(I->getSourceRange().getBegin(), 4284 diag::note_constexpr_virtual_base_here) << I->getSourceRange(); 4285 } else if (!RD->isAggregate() && !RD->hasConstexprNonCopyMoveConstructor()) { 4286 Diag(RD->getLocation(), diag::note_non_literal_no_constexpr_ctors) << RD; 4287 4288 switch (RD->getTemplateSpecializationKind()) { 4289 case TSK_Undeclared: 4290 case TSK_ExplicitSpecialization: 4291 break; 4292 4293 case TSK_ImplicitInstantiation: 4294 case TSK_ExplicitInstantiationDeclaration: 4295 case TSK_ExplicitInstantiationDefinition: 4296 // If the base template had constexpr constructors which were 4297 // instantiated as non-constexpr constructors, explain why. 4298 for (CXXRecordDecl::ctor_iterator I = RD->ctor_begin(), 4299 E = RD->ctor_end(); I != E; ++I) { 4300 if ((*I)->isCopyConstructor() || (*I)->isMoveConstructor()) 4301 continue; 4302 4303 FunctionDecl *Base = (*I)->getInstantiatedFromMemberFunction(); 4304 if (Base && Base->isConstexpr()) 4305 CheckConstexprFunctionDecl(*I, CCK_NoteNonConstexprInstantiation); 4306 } 4307 } 4308 } else if (RD->hasNonLiteralTypeFieldsOrBases()) { 4309 for (CXXRecordDecl::base_class_const_iterator I = RD->bases_begin(), 4310 E = RD->bases_end(); I != E; ++I) { 4311 if (!I->getType()->isLiteralType()) { 4312 Diag(I->getSourceRange().getBegin(), 4313 diag::note_non_literal_base_class) 4314 << RD << I->getType() << I->getSourceRange(); 4315 return true; 4316 } 4317 } 4318 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 4319 E = RD->field_end(); I != E; ++I) { 4320 if (!(*I)->getType()->isLiteralType()) { 4321 Diag((*I)->getLocation(), diag::note_non_literal_field) 4322 << RD << (*I) << (*I)->getType(); 4323 return true; 4324 } 4325 } 4326 } else if (!RD->hasTrivialDestructor()) { 4327 // All fields and bases are of literal types, so have trivial destructors. 4328 // If this class's destructor is non-trivial it must be user-declared. 4329 CXXDestructorDecl *Dtor = RD->getDestructor(); 4330 assert(Dtor && "class has literal fields and bases but no dtor?"); 4331 if (!Dtor) 4332 return true; 4333 4334 Diag(Dtor->getLocation(), Dtor->isUserProvided() ? 4335 diag::note_non_literal_user_provided_dtor : 4336 diag::note_non_literal_nontrivial_dtor) << RD; 4337 } 4338 4339 return true; 4340} 4341 4342/// \brief Retrieve a version of the type 'T' that is elaborated by Keyword 4343/// and qualified by the nested-name-specifier contained in SS. 4344QualType Sema::getElaboratedType(ElaboratedTypeKeyword Keyword, 4345 const CXXScopeSpec &SS, QualType T) { 4346 if (T.isNull()) 4347 return T; 4348 NestedNameSpecifier *NNS; 4349 if (SS.isValid()) 4350 NNS = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 4351 else { 4352 if (Keyword == ETK_None) 4353 return T; 4354 NNS = 0; 4355 } 4356 return Context.getElaboratedType(Keyword, NNS, T); 4357} 4358 4359QualType Sema::BuildTypeofExprType(Expr *E, SourceLocation Loc) { 4360 ExprResult ER = CheckPlaceholderExpr(E); 4361 if (ER.isInvalid()) return QualType(); 4362 E = ER.take(); 4363 4364 if (!E->isTypeDependent()) { 4365 QualType T = E->getType(); 4366 if (const TagType *TT = T->getAs<TagType>()) 4367 DiagnoseUseOfDecl(TT->getDecl(), E->getExprLoc()); 4368 } 4369 return Context.getTypeOfExprType(E); 4370} 4371 4372/// getDecltypeForExpr - Given an expr, will return the decltype for 4373/// that expression, according to the rules in C++11 4374/// [dcl.type.simple]p4 and C++11 [expr.lambda.prim]p18. 4375static QualType getDecltypeForExpr(Sema &S, Expr *E) { 4376 if (E->isTypeDependent()) 4377 return S.Context.DependentTy; 4378 4379 // If e is an id expression or a class member access, decltype(e) is defined 4380 // as the type of the entity named by e. 4381 if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E)) { 4382 if (const ValueDecl *VD = dyn_cast<ValueDecl>(DRE->getDecl())) 4383 return VD->getType(); 4384 } 4385 if (const MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 4386 if (const FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl())) 4387 return FD->getType(); 4388 } 4389 // If e is a function call or an invocation of an overloaded operator, 4390 // (parentheses around e are ignored), decltype(e) is defined as the 4391 // return type of that function. 4392 if (const CallExpr *CE = dyn_cast<CallExpr>(E->IgnoreParens())) 4393 return CE->getCallReturnType(); 4394 4395 // C++11 [expr.lambda.prim]p18: 4396 // Every occurrence of decltype((x)) where x is a possibly 4397 // parenthesized id-expression that names an entity of automatic 4398 // storage duration is treated as if x were transformed into an 4399 // access to a corresponding data member of the closure type that 4400 // would have been declared if x were an odr-use of the denoted 4401 // entity. 4402 using namespace sema; 4403 if (S.getCurLambda()) { 4404 if (isa<ParenExpr>(E)) { 4405 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E->IgnoreParens())) { 4406 if (VarDecl *Var = dyn_cast<VarDecl>(DRE->getDecl())) { 4407 QualType T = Var->getType(); 4408 unsigned FunctionScopesIndex; 4409 bool Nested; 4410 // Determine whether we can capture this variable. 4411 if (S.canCaptureVariable(Var, DRE->getLocation(), 4412 /*Explicit=*/false, /*Diagnose=*/false, 4413 T, FunctionScopesIndex, Nested)) { 4414 // Outer lambda scopes may have an effect on the type of a 4415 // capture. Walk the captures outside-in to determine 4416 // whether they can add 'const' to a capture by copy. 4417 if (FunctionScopesIndex == S.FunctionScopes.size()) 4418 --FunctionScopesIndex; 4419 for (unsigned I = FunctionScopesIndex, 4420 E = S.FunctionScopes.size(); 4421 I != E; ++I) { 4422 LambdaScopeInfo *LSI 4423 = dyn_cast<LambdaScopeInfo>(S.FunctionScopes[I]); 4424 if (!LSI) 4425 continue; 4426 4427 bool ByRef = false; 4428 if (LSI->isCaptured(Var)) 4429 ByRef = LSI->getCapture(Var).isReferenceCapture(); 4430 else 4431 ByRef = (LSI->ImpCaptureStyle 4432 == CapturingScopeInfo::ImpCap_LambdaByref); 4433 4434 T = S.getLambdaCaptureFieldType(T, ByRef); 4435 if (!ByRef && !LSI->Mutable) 4436 T.addConst(); 4437 } 4438 4439 if (!T->isReferenceType()) 4440 T = S.Context.getLValueReferenceType(T); 4441 return T; 4442 } 4443 } 4444 } 4445 } 4446 } 4447 4448 QualType T = E->getType(); 4449 4450 // Otherwise, where T is the type of e, if e is an lvalue, decltype(e) is 4451 // defined as T&, otherwise decltype(e) is defined as T. 4452 if (E->isLValue()) 4453 T = S.Context.getLValueReferenceType(T); 4454 4455 return T; 4456} 4457 4458QualType Sema::BuildDecltypeType(Expr *E, SourceLocation Loc) { 4459 ExprResult ER = CheckPlaceholderExpr(E); 4460 if (ER.isInvalid()) return QualType(); 4461 E = ER.take(); 4462 4463 return Context.getDecltypeType(E, getDecltypeForExpr(*this, E)); 4464} 4465 4466QualType Sema::BuildUnaryTransformType(QualType BaseType, 4467 UnaryTransformType::UTTKind UKind, 4468 SourceLocation Loc) { 4469 switch (UKind) { 4470 case UnaryTransformType::EnumUnderlyingType: 4471 if (!BaseType->isDependentType() && !BaseType->isEnumeralType()) { 4472 Diag(Loc, diag::err_only_enums_have_underlying_types); 4473 return QualType(); 4474 } else { 4475 QualType Underlying = BaseType; 4476 if (!BaseType->isDependentType()) { 4477 EnumDecl *ED = BaseType->getAs<EnumType>()->getDecl(); 4478 assert(ED && "EnumType has no EnumDecl"); 4479 DiagnoseUseOfDecl(ED, Loc); 4480 Underlying = ED->getIntegerType(); 4481 } 4482 assert(!Underlying.isNull()); 4483 return Context.getUnaryTransformType(BaseType, Underlying, 4484 UnaryTransformType::EnumUnderlyingType); 4485 } 4486 } 4487 llvm_unreachable("unknown unary transform type"); 4488} 4489 4490QualType Sema::BuildAtomicType(QualType T, SourceLocation Loc) { 4491 if (!T->isDependentType()) { 4492 // FIXME: It isn't entirely clear whether incomplete atomic types 4493 // are allowed or not; for simplicity, ban them for the moment. 4494 if (RequireCompleteType(Loc, T, 4495 PDiag(diag::err_atomic_specifier_bad_type) << 0)) 4496 return QualType(); 4497 4498 int DisallowedKind = -1; 4499 if (T->isArrayType()) 4500 DisallowedKind = 1; 4501 else if (T->isFunctionType()) 4502 DisallowedKind = 2; 4503 else if (T->isReferenceType()) 4504 DisallowedKind = 3; 4505 else if (T->isAtomicType()) 4506 DisallowedKind = 4; 4507 else if (T.hasQualifiers()) 4508 DisallowedKind = 5; 4509 else if (!T.isTriviallyCopyableType(Context)) 4510 // Some other non-trivially-copyable type (probably a C++ class) 4511 DisallowedKind = 6; 4512 4513 if (DisallowedKind != -1) { 4514 Diag(Loc, diag::err_atomic_specifier_bad_type) << DisallowedKind << T; 4515 return QualType(); 4516 } 4517 4518 // FIXME: Do we need any handling for ARC here? 4519 } 4520 4521 // Build the pointer type. 4522 return Context.getAtomicType(T); 4523} 4524