SemaType.cpp revision 93c878ee093f2a233c32b29f074e6a3f511e333f
1//===--- SemaType.cpp - Semantic Analysis for Types -----------------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements type-related semantic analysis. 11// 12//===----------------------------------------------------------------------===// 13 14#include "clang/Sema/SemaInternal.h" 15#include "clang/Sema/Template.h" 16#include "clang/Basic/OpenCL.h" 17#include "clang/AST/ASTContext.h" 18#include "clang/AST/ASTMutationListener.h" 19#include "clang/AST/CXXInheritance.h" 20#include "clang/AST/DeclObjC.h" 21#include "clang/AST/DeclTemplate.h" 22#include "clang/AST/TypeLoc.h" 23#include "clang/AST/TypeLocVisitor.h" 24#include "clang/AST/Expr.h" 25#include "clang/Basic/PartialDiagnostic.h" 26#include "clang/Basic/TargetInfo.h" 27#include "clang/Lex/Preprocessor.h" 28#include "clang/Sema/DeclSpec.h" 29#include "clang/Sema/DelayedDiagnostic.h" 30#include "clang/Sema/Lookup.h" 31#include "llvm/ADT/SmallPtrSet.h" 32#include "llvm/Support/ErrorHandling.h" 33using namespace clang; 34 35/// isOmittedBlockReturnType - Return true if this declarator is missing a 36/// return type because this is a omitted return type on a block literal. 37static bool isOmittedBlockReturnType(const Declarator &D) { 38 if (D.getContext() != Declarator::BlockLiteralContext || 39 D.getDeclSpec().hasTypeSpecifier()) 40 return false; 41 42 if (D.getNumTypeObjects() == 0) 43 return true; // ^{ ... } 44 45 if (D.getNumTypeObjects() == 1 && 46 D.getTypeObject(0).Kind == DeclaratorChunk::Function) 47 return true; // ^(int X, float Y) { ... } 48 49 return false; 50} 51 52/// diagnoseBadTypeAttribute - Diagnoses a type attribute which 53/// doesn't apply to the given type. 54static void diagnoseBadTypeAttribute(Sema &S, const AttributeList &attr, 55 QualType type) { 56 bool useExpansionLoc = false; 57 58 unsigned diagID = 0; 59 switch (attr.getKind()) { 60 case AttributeList::AT_objc_gc: 61 diagID = diag::warn_pointer_attribute_wrong_type; 62 useExpansionLoc = true; 63 break; 64 65 case AttributeList::AT_objc_ownership: 66 diagID = diag::warn_objc_object_attribute_wrong_type; 67 useExpansionLoc = true; 68 break; 69 70 default: 71 // Assume everything else was a function attribute. 72 diagID = diag::warn_function_attribute_wrong_type; 73 break; 74 } 75 76 SourceLocation loc = attr.getLoc(); 77 StringRef name = attr.getName()->getName(); 78 79 // The GC attributes are usually written with macros; special-case them. 80 if (useExpansionLoc && loc.isMacroID() && attr.getParameterName()) { 81 if (attr.getParameterName()->isStr("strong")) { 82 if (S.findMacroSpelling(loc, "__strong")) name = "__strong"; 83 } else if (attr.getParameterName()->isStr("weak")) { 84 if (S.findMacroSpelling(loc, "__weak")) name = "__weak"; 85 } 86 } 87 88 S.Diag(loc, diagID) << name << type; 89} 90 91// objc_gc applies to Objective-C pointers or, otherwise, to the 92// smallest available pointer type (i.e. 'void*' in 'void**'). 93#define OBJC_POINTER_TYPE_ATTRS_CASELIST \ 94 case AttributeList::AT_objc_gc: \ 95 case AttributeList::AT_objc_ownership 96 97// Function type attributes. 98#define FUNCTION_TYPE_ATTRS_CASELIST \ 99 case AttributeList::AT_noreturn: \ 100 case AttributeList::AT_cdecl: \ 101 case AttributeList::AT_fastcall: \ 102 case AttributeList::AT_stdcall: \ 103 case AttributeList::AT_thiscall: \ 104 case AttributeList::AT_pascal: \ 105 case AttributeList::AT_regparm: \ 106 case AttributeList::AT_pcs \ 107 108namespace { 109 /// An object which stores processing state for the entire 110 /// GetTypeForDeclarator process. 111 class TypeProcessingState { 112 Sema &sema; 113 114 /// The declarator being processed. 115 Declarator &declarator; 116 117 /// The index of the declarator chunk we're currently processing. 118 /// May be the total number of valid chunks, indicating the 119 /// DeclSpec. 120 unsigned chunkIndex; 121 122 /// Whether there are non-trivial modifications to the decl spec. 123 bool trivial; 124 125 /// Whether we saved the attributes in the decl spec. 126 bool hasSavedAttrs; 127 128 /// The original set of attributes on the DeclSpec. 129 SmallVector<AttributeList*, 2> savedAttrs; 130 131 /// A list of attributes to diagnose the uselessness of when the 132 /// processing is complete. 133 SmallVector<AttributeList*, 2> ignoredTypeAttrs; 134 135 public: 136 TypeProcessingState(Sema &sema, Declarator &declarator) 137 : sema(sema), declarator(declarator), 138 chunkIndex(declarator.getNumTypeObjects()), 139 trivial(true), hasSavedAttrs(false) {} 140 141 Sema &getSema() const { 142 return sema; 143 } 144 145 Declarator &getDeclarator() const { 146 return declarator; 147 } 148 149 unsigned getCurrentChunkIndex() const { 150 return chunkIndex; 151 } 152 153 void setCurrentChunkIndex(unsigned idx) { 154 assert(idx <= declarator.getNumTypeObjects()); 155 chunkIndex = idx; 156 } 157 158 AttributeList *&getCurrentAttrListRef() const { 159 assert(chunkIndex <= declarator.getNumTypeObjects()); 160 if (chunkIndex == declarator.getNumTypeObjects()) 161 return getMutableDeclSpec().getAttributes().getListRef(); 162 return declarator.getTypeObject(chunkIndex).getAttrListRef(); 163 } 164 165 /// Save the current set of attributes on the DeclSpec. 166 void saveDeclSpecAttrs() { 167 // Don't try to save them multiple times. 168 if (hasSavedAttrs) return; 169 170 DeclSpec &spec = getMutableDeclSpec(); 171 for (AttributeList *attr = spec.getAttributes().getList(); attr; 172 attr = attr->getNext()) 173 savedAttrs.push_back(attr); 174 trivial &= savedAttrs.empty(); 175 hasSavedAttrs = true; 176 } 177 178 /// Record that we had nowhere to put the given type attribute. 179 /// We will diagnose such attributes later. 180 void addIgnoredTypeAttr(AttributeList &attr) { 181 ignoredTypeAttrs.push_back(&attr); 182 } 183 184 /// Diagnose all the ignored type attributes, given that the 185 /// declarator worked out to the given type. 186 void diagnoseIgnoredTypeAttrs(QualType type) const { 187 for (SmallVectorImpl<AttributeList*>::const_iterator 188 i = ignoredTypeAttrs.begin(), e = ignoredTypeAttrs.end(); 189 i != e; ++i) 190 diagnoseBadTypeAttribute(getSema(), **i, type); 191 } 192 193 ~TypeProcessingState() { 194 if (trivial) return; 195 196 restoreDeclSpecAttrs(); 197 } 198 199 private: 200 DeclSpec &getMutableDeclSpec() const { 201 return const_cast<DeclSpec&>(declarator.getDeclSpec()); 202 } 203 204 void restoreDeclSpecAttrs() { 205 assert(hasSavedAttrs); 206 207 if (savedAttrs.empty()) { 208 getMutableDeclSpec().getAttributes().set(0); 209 return; 210 } 211 212 getMutableDeclSpec().getAttributes().set(savedAttrs[0]); 213 for (unsigned i = 0, e = savedAttrs.size() - 1; i != e; ++i) 214 savedAttrs[i]->setNext(savedAttrs[i+1]); 215 savedAttrs.back()->setNext(0); 216 } 217 }; 218 219 /// Basically std::pair except that we really want to avoid an 220 /// implicit operator= for safety concerns. It's also a minor 221 /// link-time optimization for this to be a private type. 222 struct AttrAndList { 223 /// The attribute. 224 AttributeList &first; 225 226 /// The head of the list the attribute is currently in. 227 AttributeList *&second; 228 229 AttrAndList(AttributeList &attr, AttributeList *&head) 230 : first(attr), second(head) {} 231 }; 232} 233 234namespace llvm { 235 template <> struct isPodLike<AttrAndList> { 236 static const bool value = true; 237 }; 238} 239 240static void spliceAttrIntoList(AttributeList &attr, AttributeList *&head) { 241 attr.setNext(head); 242 head = &attr; 243} 244 245static void spliceAttrOutOfList(AttributeList &attr, AttributeList *&head) { 246 if (head == &attr) { 247 head = attr.getNext(); 248 return; 249 } 250 251 AttributeList *cur = head; 252 while (true) { 253 assert(cur && cur->getNext() && "ran out of attrs?"); 254 if (cur->getNext() == &attr) { 255 cur->setNext(attr.getNext()); 256 return; 257 } 258 cur = cur->getNext(); 259 } 260} 261 262static void moveAttrFromListToList(AttributeList &attr, 263 AttributeList *&fromList, 264 AttributeList *&toList) { 265 spliceAttrOutOfList(attr, fromList); 266 spliceAttrIntoList(attr, toList); 267} 268 269static void processTypeAttrs(TypeProcessingState &state, 270 QualType &type, bool isDeclSpec, 271 AttributeList *attrs); 272 273static bool handleFunctionTypeAttr(TypeProcessingState &state, 274 AttributeList &attr, 275 QualType &type); 276 277static bool handleObjCGCTypeAttr(TypeProcessingState &state, 278 AttributeList &attr, QualType &type); 279 280static bool handleObjCOwnershipTypeAttr(TypeProcessingState &state, 281 AttributeList &attr, QualType &type); 282 283static bool handleObjCPointerTypeAttr(TypeProcessingState &state, 284 AttributeList &attr, QualType &type) { 285 if (attr.getKind() == AttributeList::AT_objc_gc) 286 return handleObjCGCTypeAttr(state, attr, type); 287 assert(attr.getKind() == AttributeList::AT_objc_ownership); 288 return handleObjCOwnershipTypeAttr(state, attr, type); 289} 290 291/// Given that an objc_gc attribute was written somewhere on a 292/// declaration *other* than on the declarator itself (for which, use 293/// distributeObjCPointerTypeAttrFromDeclarator), and given that it 294/// didn't apply in whatever position it was written in, try to move 295/// it to a more appropriate position. 296static void distributeObjCPointerTypeAttr(TypeProcessingState &state, 297 AttributeList &attr, 298 QualType type) { 299 Declarator &declarator = state.getDeclarator(); 300 for (unsigned i = state.getCurrentChunkIndex(); i != 0; --i) { 301 DeclaratorChunk &chunk = declarator.getTypeObject(i-1); 302 switch (chunk.Kind) { 303 case DeclaratorChunk::Pointer: 304 case DeclaratorChunk::BlockPointer: 305 moveAttrFromListToList(attr, state.getCurrentAttrListRef(), 306 chunk.getAttrListRef()); 307 return; 308 309 case DeclaratorChunk::Paren: 310 case DeclaratorChunk::Array: 311 continue; 312 313 // Don't walk through these. 314 case DeclaratorChunk::Reference: 315 case DeclaratorChunk::Function: 316 case DeclaratorChunk::MemberPointer: 317 goto error; 318 } 319 } 320 error: 321 322 diagnoseBadTypeAttribute(state.getSema(), attr, type); 323} 324 325/// Distribute an objc_gc type attribute that was written on the 326/// declarator. 327static void 328distributeObjCPointerTypeAttrFromDeclarator(TypeProcessingState &state, 329 AttributeList &attr, 330 QualType &declSpecType) { 331 Declarator &declarator = state.getDeclarator(); 332 333 // objc_gc goes on the innermost pointer to something that's not a 334 // pointer. 335 unsigned innermost = -1U; 336 bool considerDeclSpec = true; 337 for (unsigned i = 0, e = declarator.getNumTypeObjects(); i != e; ++i) { 338 DeclaratorChunk &chunk = declarator.getTypeObject(i); 339 switch (chunk.Kind) { 340 case DeclaratorChunk::Pointer: 341 case DeclaratorChunk::BlockPointer: 342 innermost = i; 343 continue; 344 345 case DeclaratorChunk::Reference: 346 case DeclaratorChunk::MemberPointer: 347 case DeclaratorChunk::Paren: 348 case DeclaratorChunk::Array: 349 continue; 350 351 case DeclaratorChunk::Function: 352 considerDeclSpec = false; 353 goto done; 354 } 355 } 356 done: 357 358 // That might actually be the decl spec if we weren't blocked by 359 // anything in the declarator. 360 if (considerDeclSpec) { 361 if (handleObjCPointerTypeAttr(state, attr, declSpecType)) { 362 // Splice the attribute into the decl spec. Prevents the 363 // attribute from being applied multiple times and gives 364 // the source-location-filler something to work with. 365 state.saveDeclSpecAttrs(); 366 moveAttrFromListToList(attr, declarator.getAttrListRef(), 367 declarator.getMutableDeclSpec().getAttributes().getListRef()); 368 return; 369 } 370 } 371 372 // Otherwise, if we found an appropriate chunk, splice the attribute 373 // into it. 374 if (innermost != -1U) { 375 moveAttrFromListToList(attr, declarator.getAttrListRef(), 376 declarator.getTypeObject(innermost).getAttrListRef()); 377 return; 378 } 379 380 // Otherwise, diagnose when we're done building the type. 381 spliceAttrOutOfList(attr, declarator.getAttrListRef()); 382 state.addIgnoredTypeAttr(attr); 383} 384 385/// A function type attribute was written somewhere in a declaration 386/// *other* than on the declarator itself or in the decl spec. Given 387/// that it didn't apply in whatever position it was written in, try 388/// to move it to a more appropriate position. 389static void distributeFunctionTypeAttr(TypeProcessingState &state, 390 AttributeList &attr, 391 QualType type) { 392 Declarator &declarator = state.getDeclarator(); 393 394 // Try to push the attribute from the return type of a function to 395 // the function itself. 396 for (unsigned i = state.getCurrentChunkIndex(); i != 0; --i) { 397 DeclaratorChunk &chunk = declarator.getTypeObject(i-1); 398 switch (chunk.Kind) { 399 case DeclaratorChunk::Function: 400 moveAttrFromListToList(attr, state.getCurrentAttrListRef(), 401 chunk.getAttrListRef()); 402 return; 403 404 case DeclaratorChunk::Paren: 405 case DeclaratorChunk::Pointer: 406 case DeclaratorChunk::BlockPointer: 407 case DeclaratorChunk::Array: 408 case DeclaratorChunk::Reference: 409 case DeclaratorChunk::MemberPointer: 410 continue; 411 } 412 } 413 414 diagnoseBadTypeAttribute(state.getSema(), attr, type); 415} 416 417/// Try to distribute a function type attribute to the innermost 418/// function chunk or type. Returns true if the attribute was 419/// distributed, false if no location was found. 420static bool 421distributeFunctionTypeAttrToInnermost(TypeProcessingState &state, 422 AttributeList &attr, 423 AttributeList *&attrList, 424 QualType &declSpecType) { 425 Declarator &declarator = state.getDeclarator(); 426 427 // Put it on the innermost function chunk, if there is one. 428 for (unsigned i = 0, e = declarator.getNumTypeObjects(); i != e; ++i) { 429 DeclaratorChunk &chunk = declarator.getTypeObject(i); 430 if (chunk.Kind != DeclaratorChunk::Function) continue; 431 432 moveAttrFromListToList(attr, attrList, chunk.getAttrListRef()); 433 return true; 434 } 435 436 if (handleFunctionTypeAttr(state, attr, declSpecType)) { 437 spliceAttrOutOfList(attr, attrList); 438 return true; 439 } 440 441 return false; 442} 443 444/// A function type attribute was written in the decl spec. Try to 445/// apply it somewhere. 446static void 447distributeFunctionTypeAttrFromDeclSpec(TypeProcessingState &state, 448 AttributeList &attr, 449 QualType &declSpecType) { 450 state.saveDeclSpecAttrs(); 451 452 // Try to distribute to the innermost. 453 if (distributeFunctionTypeAttrToInnermost(state, attr, 454 state.getCurrentAttrListRef(), 455 declSpecType)) 456 return; 457 458 // If that failed, diagnose the bad attribute when the declarator is 459 // fully built. 460 state.addIgnoredTypeAttr(attr); 461} 462 463/// A function type attribute was written on the declarator. Try to 464/// apply it somewhere. 465static void 466distributeFunctionTypeAttrFromDeclarator(TypeProcessingState &state, 467 AttributeList &attr, 468 QualType &declSpecType) { 469 Declarator &declarator = state.getDeclarator(); 470 471 // Try to distribute to the innermost. 472 if (distributeFunctionTypeAttrToInnermost(state, attr, 473 declarator.getAttrListRef(), 474 declSpecType)) 475 return; 476 477 // If that failed, diagnose the bad attribute when the declarator is 478 // fully built. 479 spliceAttrOutOfList(attr, declarator.getAttrListRef()); 480 state.addIgnoredTypeAttr(attr); 481} 482 483/// \brief Given that there are attributes written on the declarator 484/// itself, try to distribute any type attributes to the appropriate 485/// declarator chunk. 486/// 487/// These are attributes like the following: 488/// int f ATTR; 489/// int (f ATTR)(); 490/// but not necessarily this: 491/// int f() ATTR; 492static void distributeTypeAttrsFromDeclarator(TypeProcessingState &state, 493 QualType &declSpecType) { 494 // Collect all the type attributes from the declarator itself. 495 assert(state.getDeclarator().getAttributes() && "declarator has no attrs!"); 496 AttributeList *attr = state.getDeclarator().getAttributes(); 497 AttributeList *next; 498 do { 499 next = attr->getNext(); 500 501 switch (attr->getKind()) { 502 OBJC_POINTER_TYPE_ATTRS_CASELIST: 503 distributeObjCPointerTypeAttrFromDeclarator(state, *attr, declSpecType); 504 break; 505 506 case AttributeList::AT_ns_returns_retained: 507 if (!state.getSema().getLangOptions().ObjCAutoRefCount) 508 break; 509 // fallthrough 510 511 FUNCTION_TYPE_ATTRS_CASELIST: 512 distributeFunctionTypeAttrFromDeclarator(state, *attr, declSpecType); 513 break; 514 515 default: 516 break; 517 } 518 } while ((attr = next)); 519} 520 521/// Add a synthetic '()' to a block-literal declarator if it is 522/// required, given the return type. 523static void maybeSynthesizeBlockSignature(TypeProcessingState &state, 524 QualType declSpecType) { 525 Declarator &declarator = state.getDeclarator(); 526 527 // First, check whether the declarator would produce a function, 528 // i.e. whether the innermost semantic chunk is a function. 529 if (declarator.isFunctionDeclarator()) { 530 // If so, make that declarator a prototyped declarator. 531 declarator.getFunctionTypeInfo().hasPrototype = true; 532 return; 533 } 534 535 // If there are any type objects, the type as written won't name a 536 // function, regardless of the decl spec type. This is because a 537 // block signature declarator is always an abstract-declarator, and 538 // abstract-declarators can't just be parentheses chunks. Therefore 539 // we need to build a function chunk unless there are no type 540 // objects and the decl spec type is a function. 541 if (!declarator.getNumTypeObjects() && declSpecType->isFunctionType()) 542 return; 543 544 // Note that there *are* cases with invalid declarators where 545 // declarators consist solely of parentheses. In general, these 546 // occur only in failed efforts to make function declarators, so 547 // faking up the function chunk is still the right thing to do. 548 549 // Otherwise, we need to fake up a function declarator. 550 SourceLocation loc = declarator.getSourceRange().getBegin(); 551 552 // ...and *prepend* it to the declarator. 553 declarator.AddInnermostTypeInfo(DeclaratorChunk::getFunction( 554 /*proto*/ true, 555 /*variadic*/ false, SourceLocation(), 556 /*args*/ 0, 0, 557 /*type quals*/ 0, 558 /*ref-qualifier*/true, SourceLocation(), 559 /*const qualifier*/SourceLocation(), 560 /*volatile qualifier*/SourceLocation(), 561 /*mutable qualifier*/SourceLocation(), 562 /*EH*/ EST_None, SourceLocation(), 0, 0, 0, 0, 563 /*parens*/ loc, loc, 564 declarator)); 565 566 // For consistency, make sure the state still has us as processing 567 // the decl spec. 568 assert(state.getCurrentChunkIndex() == declarator.getNumTypeObjects() - 1); 569 state.setCurrentChunkIndex(declarator.getNumTypeObjects()); 570} 571 572/// \brief Convert the specified declspec to the appropriate type 573/// object. 574/// \param D the declarator containing the declaration specifier. 575/// \returns The type described by the declaration specifiers. This function 576/// never returns null. 577static QualType ConvertDeclSpecToType(TypeProcessingState &state) { 578 // FIXME: Should move the logic from DeclSpec::Finish to here for validity 579 // checking. 580 581 Sema &S = state.getSema(); 582 Declarator &declarator = state.getDeclarator(); 583 const DeclSpec &DS = declarator.getDeclSpec(); 584 SourceLocation DeclLoc = declarator.getIdentifierLoc(); 585 if (DeclLoc.isInvalid()) 586 DeclLoc = DS.getSourceRange().getBegin(); 587 588 ASTContext &Context = S.Context; 589 590 QualType Result; 591 switch (DS.getTypeSpecType()) { 592 case DeclSpec::TST_void: 593 Result = Context.VoidTy; 594 break; 595 case DeclSpec::TST_char: 596 if (DS.getTypeSpecSign() == DeclSpec::TSS_unspecified) 597 Result = Context.CharTy; 598 else if (DS.getTypeSpecSign() == DeclSpec::TSS_signed) 599 Result = Context.SignedCharTy; 600 else { 601 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unsigned && 602 "Unknown TSS value"); 603 Result = Context.UnsignedCharTy; 604 } 605 break; 606 case DeclSpec::TST_wchar: 607 if (DS.getTypeSpecSign() == DeclSpec::TSS_unspecified) 608 Result = Context.WCharTy; 609 else if (DS.getTypeSpecSign() == DeclSpec::TSS_signed) { 610 S.Diag(DS.getTypeSpecSignLoc(), diag::ext_invalid_sign_spec) 611 << DS.getSpecifierName(DS.getTypeSpecType()); 612 Result = Context.getSignedWCharType(); 613 } else { 614 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unsigned && 615 "Unknown TSS value"); 616 S.Diag(DS.getTypeSpecSignLoc(), diag::ext_invalid_sign_spec) 617 << DS.getSpecifierName(DS.getTypeSpecType()); 618 Result = Context.getUnsignedWCharType(); 619 } 620 break; 621 case DeclSpec::TST_char16: 622 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unspecified && 623 "Unknown TSS value"); 624 Result = Context.Char16Ty; 625 break; 626 case DeclSpec::TST_char32: 627 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unspecified && 628 "Unknown TSS value"); 629 Result = Context.Char32Ty; 630 break; 631 case DeclSpec::TST_unspecified: 632 // "<proto1,proto2>" is an objc qualified ID with a missing id. 633 if (DeclSpec::ProtocolQualifierListTy PQ = DS.getProtocolQualifiers()) { 634 Result = Context.getObjCObjectType(Context.ObjCBuiltinIdTy, 635 (ObjCProtocolDecl**)PQ, 636 DS.getNumProtocolQualifiers()); 637 Result = Context.getObjCObjectPointerType(Result); 638 break; 639 } 640 641 // If this is a missing declspec in a block literal return context, then it 642 // is inferred from the return statements inside the block. 643 // The declspec is always missing in a lambda expr context; it is either 644 // specified with a trailing return type or inferred. 645 if (declarator.getContext() == Declarator::LambdaExprContext || 646 isOmittedBlockReturnType(declarator)) { 647 Result = Context.DependentTy; 648 break; 649 } 650 651 // Unspecified typespec defaults to int in C90. However, the C90 grammar 652 // [C90 6.5] only allows a decl-spec if there was *some* type-specifier, 653 // type-qualifier, or storage-class-specifier. If not, emit an extwarn. 654 // Note that the one exception to this is function definitions, which are 655 // allowed to be completely missing a declspec. This is handled in the 656 // parser already though by it pretending to have seen an 'int' in this 657 // case. 658 if (S.getLangOptions().ImplicitInt) { 659 // In C89 mode, we only warn if there is a completely missing declspec 660 // when one is not allowed. 661 if (DS.isEmpty()) { 662 S.Diag(DeclLoc, diag::ext_missing_declspec) 663 << DS.getSourceRange() 664 << FixItHint::CreateInsertion(DS.getSourceRange().getBegin(), "int"); 665 } 666 } else if (!DS.hasTypeSpecifier()) { 667 // C99 and C++ require a type specifier. For example, C99 6.7.2p2 says: 668 // "At least one type specifier shall be given in the declaration 669 // specifiers in each declaration, and in the specifier-qualifier list in 670 // each struct declaration and type name." 671 // FIXME: Does Microsoft really have the implicit int extension in C++? 672 if (S.getLangOptions().CPlusPlus && 673 !S.getLangOptions().MicrosoftExt) { 674 S.Diag(DeclLoc, diag::err_missing_type_specifier) 675 << DS.getSourceRange(); 676 677 // When this occurs in C++ code, often something is very broken with the 678 // value being declared, poison it as invalid so we don't get chains of 679 // errors. 680 declarator.setInvalidType(true); 681 } else { 682 S.Diag(DeclLoc, diag::ext_missing_type_specifier) 683 << DS.getSourceRange(); 684 } 685 } 686 687 // FALL THROUGH. 688 case DeclSpec::TST_int: { 689 if (DS.getTypeSpecSign() != DeclSpec::TSS_unsigned) { 690 switch (DS.getTypeSpecWidth()) { 691 case DeclSpec::TSW_unspecified: Result = Context.IntTy; break; 692 case DeclSpec::TSW_short: Result = Context.ShortTy; break; 693 case DeclSpec::TSW_long: Result = Context.LongTy; break; 694 case DeclSpec::TSW_longlong: 695 Result = Context.LongLongTy; 696 697 // long long is a C99 feature. 698 if (!S.getLangOptions().C99) 699 S.Diag(DS.getTypeSpecWidthLoc(), 700 S.getLangOptions().CPlusPlus0x ? 701 diag::warn_cxx98_compat_longlong : diag::ext_longlong); 702 break; 703 } 704 } else { 705 switch (DS.getTypeSpecWidth()) { 706 case DeclSpec::TSW_unspecified: Result = Context.UnsignedIntTy; break; 707 case DeclSpec::TSW_short: Result = Context.UnsignedShortTy; break; 708 case DeclSpec::TSW_long: Result = Context.UnsignedLongTy; break; 709 case DeclSpec::TSW_longlong: 710 Result = Context.UnsignedLongLongTy; 711 712 // long long is a C99 feature. 713 if (!S.getLangOptions().C99) 714 S.Diag(DS.getTypeSpecWidthLoc(), 715 S.getLangOptions().CPlusPlus0x ? 716 diag::warn_cxx98_compat_longlong : diag::ext_longlong); 717 break; 718 } 719 } 720 break; 721 } 722 case DeclSpec::TST_half: Result = Context.HalfTy; break; 723 case DeclSpec::TST_float: Result = Context.FloatTy; break; 724 case DeclSpec::TST_double: 725 if (DS.getTypeSpecWidth() == DeclSpec::TSW_long) 726 Result = Context.LongDoubleTy; 727 else 728 Result = Context.DoubleTy; 729 730 if (S.getLangOptions().OpenCL && !S.getOpenCLOptions().cl_khr_fp64) { 731 S.Diag(DS.getTypeSpecTypeLoc(), diag::err_double_requires_fp64); 732 declarator.setInvalidType(true); 733 } 734 break; 735 case DeclSpec::TST_bool: Result = Context.BoolTy; break; // _Bool or bool 736 case DeclSpec::TST_decimal32: // _Decimal32 737 case DeclSpec::TST_decimal64: // _Decimal64 738 case DeclSpec::TST_decimal128: // _Decimal128 739 S.Diag(DS.getTypeSpecTypeLoc(), diag::err_decimal_unsupported); 740 Result = Context.IntTy; 741 declarator.setInvalidType(true); 742 break; 743 case DeclSpec::TST_class: 744 case DeclSpec::TST_enum: 745 case DeclSpec::TST_union: 746 case DeclSpec::TST_struct: { 747 TypeDecl *D = dyn_cast_or_null<TypeDecl>(DS.getRepAsDecl()); 748 if (!D) { 749 // This can happen in C++ with ambiguous lookups. 750 Result = Context.IntTy; 751 declarator.setInvalidType(true); 752 break; 753 } 754 755 // If the type is deprecated or unavailable, diagnose it. 756 S.DiagnoseUseOfDecl(D, DS.getTypeSpecTypeNameLoc()); 757 758 assert(DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 && 759 DS.getTypeSpecSign() == 0 && "No qualifiers on tag names!"); 760 761 // TypeQuals handled by caller. 762 Result = Context.getTypeDeclType(D); 763 764 // In both C and C++, make an ElaboratedType. 765 ElaboratedTypeKeyword Keyword 766 = ElaboratedType::getKeywordForTypeSpec(DS.getTypeSpecType()); 767 Result = S.getElaboratedType(Keyword, DS.getTypeSpecScope(), Result); 768 769 if (D->isInvalidDecl()) 770 declarator.setInvalidType(true); 771 break; 772 } 773 case DeclSpec::TST_typename: { 774 assert(DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 && 775 DS.getTypeSpecSign() == 0 && 776 "Can't handle qualifiers on typedef names yet!"); 777 Result = S.GetTypeFromParser(DS.getRepAsType()); 778 if (Result.isNull()) 779 declarator.setInvalidType(true); 780 else if (DeclSpec::ProtocolQualifierListTy PQ 781 = DS.getProtocolQualifiers()) { 782 if (const ObjCObjectType *ObjT = Result->getAs<ObjCObjectType>()) { 783 // Silently drop any existing protocol qualifiers. 784 // TODO: determine whether that's the right thing to do. 785 if (ObjT->getNumProtocols()) 786 Result = ObjT->getBaseType(); 787 788 if (DS.getNumProtocolQualifiers()) 789 Result = Context.getObjCObjectType(Result, 790 (ObjCProtocolDecl**) PQ, 791 DS.getNumProtocolQualifiers()); 792 } else if (Result->isObjCIdType()) { 793 // id<protocol-list> 794 Result = Context.getObjCObjectType(Context.ObjCBuiltinIdTy, 795 (ObjCProtocolDecl**) PQ, 796 DS.getNumProtocolQualifiers()); 797 Result = Context.getObjCObjectPointerType(Result); 798 } else if (Result->isObjCClassType()) { 799 // Class<protocol-list> 800 Result = Context.getObjCObjectType(Context.ObjCBuiltinClassTy, 801 (ObjCProtocolDecl**) PQ, 802 DS.getNumProtocolQualifiers()); 803 Result = Context.getObjCObjectPointerType(Result); 804 } else { 805 S.Diag(DeclLoc, diag::err_invalid_protocol_qualifiers) 806 << DS.getSourceRange(); 807 declarator.setInvalidType(true); 808 } 809 } 810 811 // TypeQuals handled by caller. 812 break; 813 } 814 case DeclSpec::TST_typeofType: 815 // FIXME: Preserve type source info. 816 Result = S.GetTypeFromParser(DS.getRepAsType()); 817 assert(!Result.isNull() && "Didn't get a type for typeof?"); 818 if (!Result->isDependentType()) 819 if (const TagType *TT = Result->getAs<TagType>()) 820 S.DiagnoseUseOfDecl(TT->getDecl(), DS.getTypeSpecTypeLoc()); 821 // TypeQuals handled by caller. 822 Result = Context.getTypeOfType(Result); 823 break; 824 case DeclSpec::TST_typeofExpr: { 825 Expr *E = DS.getRepAsExpr(); 826 assert(E && "Didn't get an expression for typeof?"); 827 // TypeQuals handled by caller. 828 Result = S.BuildTypeofExprType(E, DS.getTypeSpecTypeLoc()); 829 if (Result.isNull()) { 830 Result = Context.IntTy; 831 declarator.setInvalidType(true); 832 } 833 break; 834 } 835 case DeclSpec::TST_decltype: { 836 Expr *E = DS.getRepAsExpr(); 837 assert(E && "Didn't get an expression for decltype?"); 838 // TypeQuals handled by caller. 839 Result = S.BuildDecltypeType(E, DS.getTypeSpecTypeLoc()); 840 if (Result.isNull()) { 841 Result = Context.IntTy; 842 declarator.setInvalidType(true); 843 } 844 break; 845 } 846 case DeclSpec::TST_underlyingType: 847 Result = S.GetTypeFromParser(DS.getRepAsType()); 848 assert(!Result.isNull() && "Didn't get a type for __underlying_type?"); 849 Result = S.BuildUnaryTransformType(Result, 850 UnaryTransformType::EnumUnderlyingType, 851 DS.getTypeSpecTypeLoc()); 852 if (Result.isNull()) { 853 Result = Context.IntTy; 854 declarator.setInvalidType(true); 855 } 856 break; 857 858 case DeclSpec::TST_auto: { 859 // TypeQuals handled by caller. 860 Result = Context.getAutoType(QualType()); 861 break; 862 } 863 864 case DeclSpec::TST_unknown_anytype: 865 Result = Context.UnknownAnyTy; 866 break; 867 868 case DeclSpec::TST_atomic: 869 Result = S.GetTypeFromParser(DS.getRepAsType()); 870 assert(!Result.isNull() && "Didn't get a type for _Atomic?"); 871 Result = S.BuildAtomicType(Result, DS.getTypeSpecTypeLoc()); 872 if (Result.isNull()) { 873 Result = Context.IntTy; 874 declarator.setInvalidType(true); 875 } 876 break; 877 878 case DeclSpec::TST_error: 879 Result = Context.IntTy; 880 declarator.setInvalidType(true); 881 break; 882 } 883 884 // Handle complex types. 885 if (DS.getTypeSpecComplex() == DeclSpec::TSC_complex) { 886 if (S.getLangOptions().Freestanding) 887 S.Diag(DS.getTypeSpecComplexLoc(), diag::ext_freestanding_complex); 888 Result = Context.getComplexType(Result); 889 } else if (DS.isTypeAltiVecVector()) { 890 unsigned typeSize = static_cast<unsigned>(Context.getTypeSize(Result)); 891 assert(typeSize > 0 && "type size for vector must be greater than 0 bits"); 892 VectorType::VectorKind VecKind = VectorType::AltiVecVector; 893 if (DS.isTypeAltiVecPixel()) 894 VecKind = VectorType::AltiVecPixel; 895 else if (DS.isTypeAltiVecBool()) 896 VecKind = VectorType::AltiVecBool; 897 Result = Context.getVectorType(Result, 128/typeSize, VecKind); 898 } 899 900 // FIXME: Imaginary. 901 if (DS.getTypeSpecComplex() == DeclSpec::TSC_imaginary) 902 S.Diag(DS.getTypeSpecComplexLoc(), diag::err_imaginary_not_supported); 903 904 // Before we process any type attributes, synthesize a block literal 905 // function declarator if necessary. 906 if (declarator.getContext() == Declarator::BlockLiteralContext) 907 maybeSynthesizeBlockSignature(state, Result); 908 909 // Apply any type attributes from the decl spec. This may cause the 910 // list of type attributes to be temporarily saved while the type 911 // attributes are pushed around. 912 if (AttributeList *attrs = DS.getAttributes().getList()) 913 processTypeAttrs(state, Result, true, attrs); 914 915 // Apply const/volatile/restrict qualifiers to T. 916 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 917 918 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 919 // or incomplete types shall not be restrict-qualified." C++ also allows 920 // restrict-qualified references. 921 if (TypeQuals & DeclSpec::TQ_restrict) { 922 if (Result->isAnyPointerType() || Result->isReferenceType()) { 923 QualType EltTy; 924 if (Result->isObjCObjectPointerType()) 925 EltTy = Result; 926 else 927 EltTy = Result->isPointerType() ? 928 Result->getAs<PointerType>()->getPointeeType() : 929 Result->getAs<ReferenceType>()->getPointeeType(); 930 931 // If we have a pointer or reference, the pointee must have an object 932 // incomplete type. 933 if (!EltTy->isIncompleteOrObjectType()) { 934 S.Diag(DS.getRestrictSpecLoc(), 935 diag::err_typecheck_invalid_restrict_invalid_pointee) 936 << EltTy << DS.getSourceRange(); 937 TypeQuals &= ~DeclSpec::TQ_restrict; // Remove the restrict qualifier. 938 } 939 } else { 940 S.Diag(DS.getRestrictSpecLoc(), 941 diag::err_typecheck_invalid_restrict_not_pointer) 942 << Result << DS.getSourceRange(); 943 TypeQuals &= ~DeclSpec::TQ_restrict; // Remove the restrict qualifier. 944 } 945 } 946 947 // Warn about CV qualifiers on functions: C99 6.7.3p8: "If the specification 948 // of a function type includes any type qualifiers, the behavior is 949 // undefined." 950 if (Result->isFunctionType() && TypeQuals) { 951 // Get some location to point at, either the C or V location. 952 SourceLocation Loc; 953 if (TypeQuals & DeclSpec::TQ_const) 954 Loc = DS.getConstSpecLoc(); 955 else if (TypeQuals & DeclSpec::TQ_volatile) 956 Loc = DS.getVolatileSpecLoc(); 957 else { 958 assert((TypeQuals & DeclSpec::TQ_restrict) && 959 "Has CVR quals but not C, V, or R?"); 960 Loc = DS.getRestrictSpecLoc(); 961 } 962 S.Diag(Loc, diag::warn_typecheck_function_qualifiers) 963 << Result << DS.getSourceRange(); 964 } 965 966 // C++ [dcl.ref]p1: 967 // Cv-qualified references are ill-formed except when the 968 // cv-qualifiers are introduced through the use of a typedef 969 // (7.1.3) or of a template type argument (14.3), in which 970 // case the cv-qualifiers are ignored. 971 // FIXME: Shouldn't we be checking SCS_typedef here? 972 if (DS.getTypeSpecType() == DeclSpec::TST_typename && 973 TypeQuals && Result->isReferenceType()) { 974 TypeQuals &= ~DeclSpec::TQ_const; 975 TypeQuals &= ~DeclSpec::TQ_volatile; 976 } 977 978 Qualifiers Quals = Qualifiers::fromCVRMask(TypeQuals); 979 Result = Context.getQualifiedType(Result, Quals); 980 } 981 982 return Result; 983} 984 985static std::string getPrintableNameForEntity(DeclarationName Entity) { 986 if (Entity) 987 return Entity.getAsString(); 988 989 return "type name"; 990} 991 992QualType Sema::BuildQualifiedType(QualType T, SourceLocation Loc, 993 Qualifiers Qs) { 994 // Enforce C99 6.7.3p2: "Types other than pointer types derived from 995 // object or incomplete types shall not be restrict-qualified." 996 if (Qs.hasRestrict()) { 997 unsigned DiagID = 0; 998 QualType ProblemTy; 999 1000 const Type *Ty = T->getCanonicalTypeInternal().getTypePtr(); 1001 if (const ReferenceType *RTy = dyn_cast<ReferenceType>(Ty)) { 1002 if (!RTy->getPointeeType()->isIncompleteOrObjectType()) { 1003 DiagID = diag::err_typecheck_invalid_restrict_invalid_pointee; 1004 ProblemTy = T->getAs<ReferenceType>()->getPointeeType(); 1005 } 1006 } else if (const PointerType *PTy = dyn_cast<PointerType>(Ty)) { 1007 if (!PTy->getPointeeType()->isIncompleteOrObjectType()) { 1008 DiagID = diag::err_typecheck_invalid_restrict_invalid_pointee; 1009 ProblemTy = T->getAs<PointerType>()->getPointeeType(); 1010 } 1011 } else if (const MemberPointerType *PTy = dyn_cast<MemberPointerType>(Ty)) { 1012 if (!PTy->getPointeeType()->isIncompleteOrObjectType()) { 1013 DiagID = diag::err_typecheck_invalid_restrict_invalid_pointee; 1014 ProblemTy = T->getAs<PointerType>()->getPointeeType(); 1015 } 1016 } else if (!Ty->isDependentType()) { 1017 // FIXME: this deserves a proper diagnostic 1018 DiagID = diag::err_typecheck_invalid_restrict_invalid_pointee; 1019 ProblemTy = T; 1020 } 1021 1022 if (DiagID) { 1023 Diag(Loc, DiagID) << ProblemTy; 1024 Qs.removeRestrict(); 1025 } 1026 } 1027 1028 return Context.getQualifiedType(T, Qs); 1029} 1030 1031/// \brief Build a paren type including \p T. 1032QualType Sema::BuildParenType(QualType T) { 1033 return Context.getParenType(T); 1034} 1035 1036/// Given that we're building a pointer or reference to the given 1037static QualType inferARCLifetimeForPointee(Sema &S, QualType type, 1038 SourceLocation loc, 1039 bool isReference) { 1040 // Bail out if retention is unrequired or already specified. 1041 if (!type->isObjCLifetimeType() || 1042 type.getObjCLifetime() != Qualifiers::OCL_None) 1043 return type; 1044 1045 Qualifiers::ObjCLifetime implicitLifetime = Qualifiers::OCL_None; 1046 1047 // If the object type is const-qualified, we can safely use 1048 // __unsafe_unretained. This is safe (because there are no read 1049 // barriers), and it'll be safe to coerce anything but __weak* to 1050 // the resulting type. 1051 if (type.isConstQualified()) { 1052 implicitLifetime = Qualifiers::OCL_ExplicitNone; 1053 1054 // Otherwise, check whether the static type does not require 1055 // retaining. This currently only triggers for Class (possibly 1056 // protocol-qualifed, and arrays thereof). 1057 } else if (type->isObjCARCImplicitlyUnretainedType()) { 1058 implicitLifetime = Qualifiers::OCL_ExplicitNone; 1059 1060 // If we are in an unevaluated context, like sizeof, assume Autoreleasing and 1061 // don't give error. 1062 } else if (S.ExprEvalContexts.back().Context == Sema::Unevaluated || 1063 S.ExprEvalContexts.back().Context == Sema::ConstantEvaluated) { 1064 implicitLifetime = Qualifiers::OCL_Autoreleasing; 1065 1066 // If that failed, give an error and recover using __autoreleasing. 1067 } else { 1068 // These types can show up in private ivars in system headers, so 1069 // we need this to not be an error in those cases. Instead we 1070 // want to delay. 1071 // 1072 // Also, make sure we delay appropriately in 1073 // PotentiallyPotentiallyEvaluated contexts. 1074 if (S.DelayedDiagnostics.shouldDelayDiagnostics()) { 1075 if (S.ExprEvalContexts.back().Context == 1076 Sema::PotentiallyPotentiallyEvaluated) { 1077 S.ExprEvalContexts.back().addDelayedDiagnostic( 1078 sema::DelayedDiagnostic::makeForbiddenType(loc, 1079 diag::err_arc_indirect_no_ownership, type, isReference)); 1080 } else { 1081 S.DelayedDiagnostics.add( 1082 sema::DelayedDiagnostic::makeForbiddenType(loc, 1083 diag::err_arc_indirect_no_ownership, type, isReference)); 1084 } 1085 } else { 1086 if (S.ExprEvalContexts.back().Context == 1087 Sema::PotentiallyPotentiallyEvaluated) { 1088 S.ExprEvalContexts.back().addDiagnostic(loc, 1089 S.PDiag(diag::err_arc_indirect_no_ownership) 1090 << type << isReference); 1091 } else { 1092 S.Diag(loc, diag::err_arc_indirect_no_ownership) << type << isReference; 1093 } 1094 } 1095 implicitLifetime = Qualifiers::OCL_Autoreleasing; 1096 } 1097 assert(implicitLifetime && "didn't infer any lifetime!"); 1098 1099 Qualifiers qs; 1100 qs.addObjCLifetime(implicitLifetime); 1101 return S.Context.getQualifiedType(type, qs); 1102} 1103 1104/// \brief Build a pointer type. 1105/// 1106/// \param T The type to which we'll be building a pointer. 1107/// 1108/// \param Loc The location of the entity whose type involves this 1109/// pointer type or, if there is no such entity, the location of the 1110/// type that will have pointer type. 1111/// 1112/// \param Entity The name of the entity that involves the pointer 1113/// type, if known. 1114/// 1115/// \returns A suitable pointer type, if there are no 1116/// errors. Otherwise, returns a NULL type. 1117QualType Sema::BuildPointerType(QualType T, 1118 SourceLocation Loc, DeclarationName Entity) { 1119 if (T->isReferenceType()) { 1120 // C++ 8.3.2p4: There shall be no ... pointers to references ... 1121 Diag(Loc, diag::err_illegal_decl_pointer_to_reference) 1122 << getPrintableNameForEntity(Entity) << T; 1123 return QualType(); 1124 } 1125 1126 assert(!T->isObjCObjectType() && "Should build ObjCObjectPointerType"); 1127 1128 // In ARC, it is forbidden to build pointers to unqualified pointers. 1129 if (getLangOptions().ObjCAutoRefCount) 1130 T = inferARCLifetimeForPointee(*this, T, Loc, /*reference*/ false); 1131 1132 // Build the pointer type. 1133 return Context.getPointerType(T); 1134} 1135 1136/// \brief Build a reference type. 1137/// 1138/// \param T The type to which we'll be building a reference. 1139/// 1140/// \param Loc The location of the entity whose type involves this 1141/// reference type or, if there is no such entity, the location of the 1142/// type that will have reference type. 1143/// 1144/// \param Entity The name of the entity that involves the reference 1145/// type, if known. 1146/// 1147/// \returns A suitable reference type, if there are no 1148/// errors. Otherwise, returns a NULL type. 1149QualType Sema::BuildReferenceType(QualType T, bool SpelledAsLValue, 1150 SourceLocation Loc, 1151 DeclarationName Entity) { 1152 assert(Context.getCanonicalType(T) != Context.OverloadTy && 1153 "Unresolved overloaded function type"); 1154 1155 // C++0x [dcl.ref]p6: 1156 // If a typedef (7.1.3), a type template-parameter (14.3.1), or a 1157 // decltype-specifier (7.1.6.2) denotes a type TR that is a reference to a 1158 // type T, an attempt to create the type "lvalue reference to cv TR" creates 1159 // the type "lvalue reference to T", while an attempt to create the type 1160 // "rvalue reference to cv TR" creates the type TR. 1161 bool LValueRef = SpelledAsLValue || T->getAs<LValueReferenceType>(); 1162 1163 // C++ [dcl.ref]p4: There shall be no references to references. 1164 // 1165 // According to C++ DR 106, references to references are only 1166 // diagnosed when they are written directly (e.g., "int & &"), 1167 // but not when they happen via a typedef: 1168 // 1169 // typedef int& intref; 1170 // typedef intref& intref2; 1171 // 1172 // Parser::ParseDeclaratorInternal diagnoses the case where 1173 // references are written directly; here, we handle the 1174 // collapsing of references-to-references as described in C++0x. 1175 // DR 106 and 540 introduce reference-collapsing into C++98/03. 1176 1177 // C++ [dcl.ref]p1: 1178 // A declarator that specifies the type "reference to cv void" 1179 // is ill-formed. 1180 if (T->isVoidType()) { 1181 Diag(Loc, diag::err_reference_to_void); 1182 return QualType(); 1183 } 1184 1185 // In ARC, it is forbidden to build references to unqualified pointers. 1186 if (getLangOptions().ObjCAutoRefCount) 1187 T = inferARCLifetimeForPointee(*this, T, Loc, /*reference*/ true); 1188 1189 // Handle restrict on references. 1190 if (LValueRef) 1191 return Context.getLValueReferenceType(T, SpelledAsLValue); 1192 return Context.getRValueReferenceType(T); 1193} 1194 1195/// Check whether the specified array size makes the array type a VLA. If so, 1196/// return true, if not, return the size of the array in SizeVal. 1197static bool isArraySizeVLA(Expr *ArraySize, llvm::APSInt &SizeVal, Sema &S) { 1198 // If the size is an ICE, it certainly isn't a VLA. 1199 if (ArraySize->isIntegerConstantExpr(SizeVal, S.Context)) 1200 return false; 1201 1202 // If we're in a GNU mode (like gnu99, but not c99) accept any evaluatable 1203 // value as an extension. 1204 if (S.LangOpts.GNUMode && ArraySize->EvaluateAsInt(SizeVal, S.Context)) { 1205 S.Diag(ArraySize->getLocStart(), diag::ext_vla_folded_to_constant); 1206 return false; 1207 } 1208 1209 return true; 1210} 1211 1212 1213/// \brief Build an array type. 1214/// 1215/// \param T The type of each element in the array. 1216/// 1217/// \param ASM C99 array size modifier (e.g., '*', 'static'). 1218/// 1219/// \param ArraySize Expression describing the size of the array. 1220/// 1221/// \param Loc The location of the entity whose type involves this 1222/// array type or, if there is no such entity, the location of the 1223/// type that will have array type. 1224/// 1225/// \param Entity The name of the entity that involves the array 1226/// type, if known. 1227/// 1228/// \returns A suitable array type, if there are no errors. Otherwise, 1229/// returns a NULL type. 1230QualType Sema::BuildArrayType(QualType T, ArrayType::ArraySizeModifier ASM, 1231 Expr *ArraySize, unsigned Quals, 1232 SourceRange Brackets, DeclarationName Entity) { 1233 1234 SourceLocation Loc = Brackets.getBegin(); 1235 if (getLangOptions().CPlusPlus) { 1236 // C++ [dcl.array]p1: 1237 // T is called the array element type; this type shall not be a reference 1238 // type, the (possibly cv-qualified) type void, a function type or an 1239 // abstract class type. 1240 // 1241 // Note: function types are handled in the common path with C. 1242 if (T->isReferenceType()) { 1243 Diag(Loc, diag::err_illegal_decl_array_of_references) 1244 << getPrintableNameForEntity(Entity) << T; 1245 return QualType(); 1246 } 1247 1248 if (T->isVoidType()) { 1249 Diag(Loc, diag::err_illegal_decl_array_incomplete_type) << T; 1250 return QualType(); 1251 } 1252 1253 if (RequireNonAbstractType(Brackets.getBegin(), T, 1254 diag::err_array_of_abstract_type)) 1255 return QualType(); 1256 1257 } else { 1258 // C99 6.7.5.2p1: If the element type is an incomplete or function type, 1259 // reject it (e.g. void ary[7], struct foo ary[7], void ary[7]()) 1260 if (RequireCompleteType(Loc, T, 1261 diag::err_illegal_decl_array_incomplete_type)) 1262 return QualType(); 1263 } 1264 1265 if (T->isFunctionType()) { 1266 Diag(Loc, diag::err_illegal_decl_array_of_functions) 1267 << getPrintableNameForEntity(Entity) << T; 1268 return QualType(); 1269 } 1270 1271 if (T->getContainedAutoType()) { 1272 Diag(Loc, diag::err_illegal_decl_array_of_auto) 1273 << getPrintableNameForEntity(Entity) << T; 1274 return QualType(); 1275 } 1276 1277 if (const RecordType *EltTy = T->getAs<RecordType>()) { 1278 // If the element type is a struct or union that contains a variadic 1279 // array, accept it as a GNU extension: C99 6.7.2.1p2. 1280 if (EltTy->getDecl()->hasFlexibleArrayMember()) 1281 Diag(Loc, diag::ext_flexible_array_in_array) << T; 1282 } else if (T->isObjCObjectType()) { 1283 Diag(Loc, diag::err_objc_array_of_interfaces) << T; 1284 return QualType(); 1285 } 1286 1287 // Do placeholder conversions on the array size expression. 1288 if (ArraySize && ArraySize->hasPlaceholderType()) { 1289 ExprResult Result = CheckPlaceholderExpr(ArraySize); 1290 if (Result.isInvalid()) return QualType(); 1291 ArraySize = Result.take(); 1292 } 1293 1294 // Do lvalue-to-rvalue conversions on the array size expression. 1295 if (ArraySize && !ArraySize->isRValue()) { 1296 ExprResult Result = DefaultLvalueConversion(ArraySize); 1297 if (Result.isInvalid()) 1298 return QualType(); 1299 1300 ArraySize = Result.take(); 1301 } 1302 1303 // C99 6.7.5.2p1: The size expression shall have integer type. 1304 // TODO: in theory, if we were insane, we could allow contextual 1305 // conversions to integer type here. 1306 if (ArraySize && !ArraySize->isTypeDependent() && 1307 !ArraySize->getType()->isIntegralOrUnscopedEnumerationType()) { 1308 Diag(ArraySize->getLocStart(), diag::err_array_size_non_int) 1309 << ArraySize->getType() << ArraySize->getSourceRange(); 1310 return QualType(); 1311 } 1312 llvm::APSInt ConstVal(Context.getTypeSize(Context.getSizeType())); 1313 if (!ArraySize) { 1314 if (ASM == ArrayType::Star) 1315 T = Context.getVariableArrayType(T, 0, ASM, Quals, Brackets); 1316 else 1317 T = Context.getIncompleteArrayType(T, ASM, Quals); 1318 } else if (ArraySize->isTypeDependent() || ArraySize->isValueDependent()) { 1319 T = Context.getDependentSizedArrayType(T, ArraySize, ASM, Quals, Brackets); 1320 } else if (!T->isDependentType() && !T->isIncompleteType() && 1321 !T->isConstantSizeType()) { 1322 // C99: an array with an element type that has a non-constant-size is a VLA. 1323 T = Context.getVariableArrayType(T, ArraySize, ASM, Quals, Brackets); 1324 } else if (isArraySizeVLA(ArraySize, ConstVal, *this)) { 1325 // C99: an array with a non-ICE size is a VLA. We accept any expression 1326 // that we can fold to a non-zero positive value as an extension. 1327 T = Context.getVariableArrayType(T, ArraySize, ASM, Quals, Brackets); 1328 } else { 1329 // C99 6.7.5.2p1: If the expression is a constant expression, it shall 1330 // have a value greater than zero. 1331 if (ConstVal.isSigned() && ConstVal.isNegative()) { 1332 if (Entity) 1333 Diag(ArraySize->getLocStart(), diag::err_decl_negative_array_size) 1334 << getPrintableNameForEntity(Entity) << ArraySize->getSourceRange(); 1335 else 1336 Diag(ArraySize->getLocStart(), diag::err_typecheck_negative_array_size) 1337 << ArraySize->getSourceRange(); 1338 return QualType(); 1339 } 1340 if (ConstVal == 0) { 1341 // GCC accepts zero sized static arrays. We allow them when 1342 // we're not in a SFINAE context. 1343 Diag(ArraySize->getLocStart(), 1344 isSFINAEContext()? diag::err_typecheck_zero_array_size 1345 : diag::ext_typecheck_zero_array_size) 1346 << ArraySize->getSourceRange(); 1347 1348 if (ASM == ArrayType::Static) { 1349 Diag(ArraySize->getLocStart(), 1350 diag::warn_typecheck_zero_static_array_size) 1351 << ArraySize->getSourceRange(); 1352 ASM = ArrayType::Normal; 1353 } 1354 } else if (!T->isDependentType() && !T->isVariablyModifiedType() && 1355 !T->isIncompleteType()) { 1356 // Is the array too large? 1357 unsigned ActiveSizeBits 1358 = ConstantArrayType::getNumAddressingBits(Context, T, ConstVal); 1359 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) 1360 Diag(ArraySize->getLocStart(), diag::err_array_too_large) 1361 << ConstVal.toString(10) 1362 << ArraySize->getSourceRange(); 1363 } 1364 1365 T = Context.getConstantArrayType(T, ConstVal, ASM, Quals); 1366 } 1367 // If this is not C99, extwarn about VLA's and C99 array size modifiers. 1368 if (!getLangOptions().C99) { 1369 if (T->isVariableArrayType()) { 1370 // Prohibit the use of non-POD types in VLAs. 1371 QualType BaseT = Context.getBaseElementType(T); 1372 if (!T->isDependentType() && 1373 !BaseT.isPODType(Context) && 1374 !BaseT->isObjCLifetimeType()) { 1375 Diag(Loc, diag::err_vla_non_pod) 1376 << BaseT; 1377 return QualType(); 1378 } 1379 // Prohibit the use of VLAs during template argument deduction. 1380 else if (isSFINAEContext()) { 1381 Diag(Loc, diag::err_vla_in_sfinae); 1382 return QualType(); 1383 } 1384 // Just extwarn about VLAs. 1385 else 1386 Diag(Loc, diag::ext_vla); 1387 } else if (ASM != ArrayType::Normal || Quals != 0) 1388 Diag(Loc, 1389 getLangOptions().CPlusPlus? diag::err_c99_array_usage_cxx 1390 : diag::ext_c99_array_usage) << ASM; 1391 } 1392 1393 return T; 1394} 1395 1396/// \brief Build an ext-vector type. 1397/// 1398/// Run the required checks for the extended vector type. 1399QualType Sema::BuildExtVectorType(QualType T, Expr *ArraySize, 1400 SourceLocation AttrLoc) { 1401 // unlike gcc's vector_size attribute, we do not allow vectors to be defined 1402 // in conjunction with complex types (pointers, arrays, functions, etc.). 1403 if (!T->isDependentType() && 1404 !T->isIntegerType() && !T->isRealFloatingType()) { 1405 Diag(AttrLoc, diag::err_attribute_invalid_vector_type) << T; 1406 return QualType(); 1407 } 1408 1409 if (!ArraySize->isTypeDependent() && !ArraySize->isValueDependent()) { 1410 llvm::APSInt vecSize(32); 1411 if (!ArraySize->isIntegerConstantExpr(vecSize, Context)) { 1412 Diag(AttrLoc, diag::err_attribute_argument_not_int) 1413 << "ext_vector_type" << ArraySize->getSourceRange(); 1414 return QualType(); 1415 } 1416 1417 // unlike gcc's vector_size attribute, the size is specified as the 1418 // number of elements, not the number of bytes. 1419 unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue()); 1420 1421 if (vectorSize == 0) { 1422 Diag(AttrLoc, diag::err_attribute_zero_size) 1423 << ArraySize->getSourceRange(); 1424 return QualType(); 1425 } 1426 1427 return Context.getExtVectorType(T, vectorSize); 1428 } 1429 1430 return Context.getDependentSizedExtVectorType(T, ArraySize, AttrLoc); 1431} 1432 1433/// \brief Build a function type. 1434/// 1435/// This routine checks the function type according to C++ rules and 1436/// under the assumption that the result type and parameter types have 1437/// just been instantiated from a template. It therefore duplicates 1438/// some of the behavior of GetTypeForDeclarator, but in a much 1439/// simpler form that is only suitable for this narrow use case. 1440/// 1441/// \param T The return type of the function. 1442/// 1443/// \param ParamTypes The parameter types of the function. This array 1444/// will be modified to account for adjustments to the types of the 1445/// function parameters. 1446/// 1447/// \param NumParamTypes The number of parameter types in ParamTypes. 1448/// 1449/// \param Variadic Whether this is a variadic function type. 1450/// 1451/// \param Quals The cvr-qualifiers to be applied to the function type. 1452/// 1453/// \param Loc The location of the entity whose type involves this 1454/// function type or, if there is no such entity, the location of the 1455/// type that will have function type. 1456/// 1457/// \param Entity The name of the entity that involves the function 1458/// type, if known. 1459/// 1460/// \returns A suitable function type, if there are no 1461/// errors. Otherwise, returns a NULL type. 1462QualType Sema::BuildFunctionType(QualType T, 1463 QualType *ParamTypes, 1464 unsigned NumParamTypes, 1465 bool Variadic, unsigned Quals, 1466 RefQualifierKind RefQualifier, 1467 SourceLocation Loc, DeclarationName Entity, 1468 FunctionType::ExtInfo Info) { 1469 if (T->isArrayType() || T->isFunctionType()) { 1470 Diag(Loc, diag::err_func_returning_array_function) 1471 << T->isFunctionType() << T; 1472 return QualType(); 1473 } 1474 1475 // Functions cannot return half FP. 1476 if (T->isHalfType()) { 1477 Diag(Loc, diag::err_parameters_retval_cannot_have_fp16_type) << 1 << 1478 FixItHint::CreateInsertion(Loc, "*"); 1479 return QualType(); 1480 } 1481 1482 bool Invalid = false; 1483 for (unsigned Idx = 0; Idx < NumParamTypes; ++Idx) { 1484 // FIXME: Loc is too inprecise here, should use proper locations for args. 1485 QualType ParamType = Context.getAdjustedParameterType(ParamTypes[Idx]); 1486 if (ParamType->isVoidType()) { 1487 Diag(Loc, diag::err_param_with_void_type); 1488 Invalid = true; 1489 } else if (ParamType->isHalfType()) { 1490 // Disallow half FP arguments. 1491 Diag(Loc, diag::err_parameters_retval_cannot_have_fp16_type) << 0 << 1492 FixItHint::CreateInsertion(Loc, "*"); 1493 Invalid = true; 1494 } 1495 1496 ParamTypes[Idx] = ParamType; 1497 } 1498 1499 if (Invalid) 1500 return QualType(); 1501 1502 FunctionProtoType::ExtProtoInfo EPI; 1503 EPI.Variadic = Variadic; 1504 EPI.TypeQuals = Quals; 1505 EPI.RefQualifier = RefQualifier; 1506 EPI.ExtInfo = Info; 1507 1508 return Context.getFunctionType(T, ParamTypes, NumParamTypes, EPI); 1509} 1510 1511/// \brief Build a member pointer type \c T Class::*. 1512/// 1513/// \param T the type to which the member pointer refers. 1514/// \param Class the class type into which the member pointer points. 1515/// \param CVR Qualifiers applied to the member pointer type 1516/// \param Loc the location where this type begins 1517/// \param Entity the name of the entity that will have this member pointer type 1518/// 1519/// \returns a member pointer type, if successful, or a NULL type if there was 1520/// an error. 1521QualType Sema::BuildMemberPointerType(QualType T, QualType Class, 1522 SourceLocation Loc, 1523 DeclarationName Entity) { 1524 // Verify that we're not building a pointer to pointer to function with 1525 // exception specification. 1526 if (CheckDistantExceptionSpec(T)) { 1527 Diag(Loc, diag::err_distant_exception_spec); 1528 1529 // FIXME: If we're doing this as part of template instantiation, 1530 // we should return immediately. 1531 1532 // Build the type anyway, but use the canonical type so that the 1533 // exception specifiers are stripped off. 1534 T = Context.getCanonicalType(T); 1535 } 1536 1537 // C++ 8.3.3p3: A pointer to member shall not point to ... a member 1538 // with reference type, or "cv void." 1539 if (T->isReferenceType()) { 1540 Diag(Loc, diag::err_illegal_decl_mempointer_to_reference) 1541 << (Entity? Entity.getAsString() : "type name") << T; 1542 return QualType(); 1543 } 1544 1545 if (T->isVoidType()) { 1546 Diag(Loc, diag::err_illegal_decl_mempointer_to_void) 1547 << (Entity? Entity.getAsString() : "type name"); 1548 return QualType(); 1549 } 1550 1551 if (!Class->isDependentType() && !Class->isRecordType()) { 1552 Diag(Loc, diag::err_mempointer_in_nonclass_type) << Class; 1553 return QualType(); 1554 } 1555 1556 // In the Microsoft ABI, the class is allowed to be an incomplete 1557 // type. In such cases, the compiler makes a worst-case assumption. 1558 // We make no such assumption right now, so emit an error if the 1559 // class isn't a complete type. 1560 if (Context.getTargetInfo().getCXXABI() == CXXABI_Microsoft && 1561 RequireCompleteType(Loc, Class, diag::err_incomplete_type)) 1562 return QualType(); 1563 1564 return Context.getMemberPointerType(T, Class.getTypePtr()); 1565} 1566 1567/// \brief Build a block pointer type. 1568/// 1569/// \param T The type to which we'll be building a block pointer. 1570/// 1571/// \param CVR The cvr-qualifiers to be applied to the block pointer type. 1572/// 1573/// \param Loc The location of the entity whose type involves this 1574/// block pointer type or, if there is no such entity, the location of the 1575/// type that will have block pointer type. 1576/// 1577/// \param Entity The name of the entity that involves the block pointer 1578/// type, if known. 1579/// 1580/// \returns A suitable block pointer type, if there are no 1581/// errors. Otherwise, returns a NULL type. 1582QualType Sema::BuildBlockPointerType(QualType T, 1583 SourceLocation Loc, 1584 DeclarationName Entity) { 1585 if (!T->isFunctionType()) { 1586 Diag(Loc, diag::err_nonfunction_block_type); 1587 return QualType(); 1588 } 1589 1590 return Context.getBlockPointerType(T); 1591} 1592 1593QualType Sema::GetTypeFromParser(ParsedType Ty, TypeSourceInfo **TInfo) { 1594 QualType QT = Ty.get(); 1595 if (QT.isNull()) { 1596 if (TInfo) *TInfo = 0; 1597 return QualType(); 1598 } 1599 1600 TypeSourceInfo *DI = 0; 1601 if (const LocInfoType *LIT = dyn_cast<LocInfoType>(QT)) { 1602 QT = LIT->getType(); 1603 DI = LIT->getTypeSourceInfo(); 1604 } 1605 1606 if (TInfo) *TInfo = DI; 1607 return QT; 1608} 1609 1610static void transferARCOwnershipToDeclaratorChunk(TypeProcessingState &state, 1611 Qualifiers::ObjCLifetime ownership, 1612 unsigned chunkIndex); 1613 1614/// Given that this is the declaration of a parameter under ARC, 1615/// attempt to infer attributes and such for pointer-to-whatever 1616/// types. 1617static void inferARCWriteback(TypeProcessingState &state, 1618 QualType &declSpecType) { 1619 Sema &S = state.getSema(); 1620 Declarator &declarator = state.getDeclarator(); 1621 1622 // TODO: should we care about decl qualifiers? 1623 1624 // Check whether the declarator has the expected form. We walk 1625 // from the inside out in order to make the block logic work. 1626 unsigned outermostPointerIndex = 0; 1627 bool isBlockPointer = false; 1628 unsigned numPointers = 0; 1629 for (unsigned i = 0, e = declarator.getNumTypeObjects(); i != e; ++i) { 1630 unsigned chunkIndex = i; 1631 DeclaratorChunk &chunk = declarator.getTypeObject(chunkIndex); 1632 switch (chunk.Kind) { 1633 case DeclaratorChunk::Paren: 1634 // Ignore parens. 1635 break; 1636 1637 case DeclaratorChunk::Reference: 1638 case DeclaratorChunk::Pointer: 1639 // Count the number of pointers. Treat references 1640 // interchangeably as pointers; if they're mis-ordered, normal 1641 // type building will discover that. 1642 outermostPointerIndex = chunkIndex; 1643 numPointers++; 1644 break; 1645 1646 case DeclaratorChunk::BlockPointer: 1647 // If we have a pointer to block pointer, that's an acceptable 1648 // indirect reference; anything else is not an application of 1649 // the rules. 1650 if (numPointers != 1) return; 1651 numPointers++; 1652 outermostPointerIndex = chunkIndex; 1653 isBlockPointer = true; 1654 1655 // We don't care about pointer structure in return values here. 1656 goto done; 1657 1658 case DeclaratorChunk::Array: // suppress if written (id[])? 1659 case DeclaratorChunk::Function: 1660 case DeclaratorChunk::MemberPointer: 1661 return; 1662 } 1663 } 1664 done: 1665 1666 // If we have *one* pointer, then we want to throw the qualifier on 1667 // the declaration-specifiers, which means that it needs to be a 1668 // retainable object type. 1669 if (numPointers == 1) { 1670 // If it's not a retainable object type, the rule doesn't apply. 1671 if (!declSpecType->isObjCRetainableType()) return; 1672 1673 // If it already has lifetime, don't do anything. 1674 if (declSpecType.getObjCLifetime()) return; 1675 1676 // Otherwise, modify the type in-place. 1677 Qualifiers qs; 1678 1679 if (declSpecType->isObjCARCImplicitlyUnretainedType()) 1680 qs.addObjCLifetime(Qualifiers::OCL_ExplicitNone); 1681 else 1682 qs.addObjCLifetime(Qualifiers::OCL_Autoreleasing); 1683 declSpecType = S.Context.getQualifiedType(declSpecType, qs); 1684 1685 // If we have *two* pointers, then we want to throw the qualifier on 1686 // the outermost pointer. 1687 } else if (numPointers == 2) { 1688 // If we don't have a block pointer, we need to check whether the 1689 // declaration-specifiers gave us something that will turn into a 1690 // retainable object pointer after we slap the first pointer on it. 1691 if (!isBlockPointer && !declSpecType->isObjCObjectType()) 1692 return; 1693 1694 // Look for an explicit lifetime attribute there. 1695 DeclaratorChunk &chunk = declarator.getTypeObject(outermostPointerIndex); 1696 if (chunk.Kind != DeclaratorChunk::Pointer && 1697 chunk.Kind != DeclaratorChunk::BlockPointer) 1698 return; 1699 for (const AttributeList *attr = chunk.getAttrs(); attr; 1700 attr = attr->getNext()) 1701 if (attr->getKind() == AttributeList::AT_objc_ownership) 1702 return; 1703 1704 transferARCOwnershipToDeclaratorChunk(state, Qualifiers::OCL_Autoreleasing, 1705 outermostPointerIndex); 1706 1707 // Any other number of pointers/references does not trigger the rule. 1708 } else return; 1709 1710 // TODO: mark whether we did this inference? 1711} 1712 1713static void DiagnoseIgnoredQualifiers(unsigned Quals, 1714 SourceLocation ConstQualLoc, 1715 SourceLocation VolatileQualLoc, 1716 SourceLocation RestrictQualLoc, 1717 Sema& S) { 1718 std::string QualStr; 1719 unsigned NumQuals = 0; 1720 SourceLocation Loc; 1721 1722 FixItHint ConstFixIt; 1723 FixItHint VolatileFixIt; 1724 FixItHint RestrictFixIt; 1725 1726 const SourceManager &SM = S.getSourceManager(); 1727 1728 // FIXME: The locations here are set kind of arbitrarily. It'd be nicer to 1729 // find a range and grow it to encompass all the qualifiers, regardless of 1730 // the order in which they textually appear. 1731 if (Quals & Qualifiers::Const) { 1732 ConstFixIt = FixItHint::CreateRemoval(ConstQualLoc); 1733 QualStr = "const"; 1734 ++NumQuals; 1735 if (!Loc.isValid() || SM.isBeforeInTranslationUnit(ConstQualLoc, Loc)) 1736 Loc = ConstQualLoc; 1737 } 1738 if (Quals & Qualifiers::Volatile) { 1739 VolatileFixIt = FixItHint::CreateRemoval(VolatileQualLoc); 1740 QualStr += (NumQuals == 0 ? "volatile" : " volatile"); 1741 ++NumQuals; 1742 if (!Loc.isValid() || SM.isBeforeInTranslationUnit(VolatileQualLoc, Loc)) 1743 Loc = VolatileQualLoc; 1744 } 1745 if (Quals & Qualifiers::Restrict) { 1746 RestrictFixIt = FixItHint::CreateRemoval(RestrictQualLoc); 1747 QualStr += (NumQuals == 0 ? "restrict" : " restrict"); 1748 ++NumQuals; 1749 if (!Loc.isValid() || SM.isBeforeInTranslationUnit(RestrictQualLoc, Loc)) 1750 Loc = RestrictQualLoc; 1751 } 1752 1753 assert(NumQuals > 0 && "No known qualifiers?"); 1754 1755 S.Diag(Loc, diag::warn_qual_return_type) 1756 << QualStr << NumQuals << ConstFixIt << VolatileFixIt << RestrictFixIt; 1757} 1758 1759static QualType GetDeclSpecTypeForDeclarator(TypeProcessingState &state, 1760 TypeSourceInfo *&ReturnTypeInfo) { 1761 Sema &SemaRef = state.getSema(); 1762 Declarator &D = state.getDeclarator(); 1763 QualType T; 1764 ReturnTypeInfo = 0; 1765 1766 // The TagDecl owned by the DeclSpec. 1767 TagDecl *OwnedTagDecl = 0; 1768 1769 switch (D.getName().getKind()) { 1770 case UnqualifiedId::IK_ImplicitSelfParam: 1771 case UnqualifiedId::IK_OperatorFunctionId: 1772 case UnqualifiedId::IK_Identifier: 1773 case UnqualifiedId::IK_LiteralOperatorId: 1774 case UnqualifiedId::IK_TemplateId: 1775 T = ConvertDeclSpecToType(state); 1776 1777 if (!D.isInvalidType() && D.getDeclSpec().isTypeSpecOwned()) { 1778 OwnedTagDecl = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 1779 // Owned declaration is embedded in declarator. 1780 OwnedTagDecl->setEmbeddedInDeclarator(true); 1781 } 1782 break; 1783 1784 case UnqualifiedId::IK_ConstructorName: 1785 case UnqualifiedId::IK_ConstructorTemplateId: 1786 case UnqualifiedId::IK_DestructorName: 1787 // Constructors and destructors don't have return types. Use 1788 // "void" instead. 1789 T = SemaRef.Context.VoidTy; 1790 break; 1791 1792 case UnqualifiedId::IK_ConversionFunctionId: 1793 // The result type of a conversion function is the type that it 1794 // converts to. 1795 T = SemaRef.GetTypeFromParser(D.getName().ConversionFunctionId, 1796 &ReturnTypeInfo); 1797 break; 1798 } 1799 1800 if (D.getAttributes()) 1801 distributeTypeAttrsFromDeclarator(state, T); 1802 1803 // C++0x [dcl.spec.auto]p5: reject 'auto' if it is not in an allowed context. 1804 // In C++0x, a function declarator using 'auto' must have a trailing return 1805 // type (this is checked later) and we can skip this. In other languages 1806 // using auto, we need to check regardless. 1807 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto && 1808 (!SemaRef.getLangOptions().CPlusPlus0x || !D.isFunctionDeclarator())) { 1809 int Error = -1; 1810 1811 switch (D.getContext()) { 1812 case Declarator::KNRTypeListContext: 1813 llvm_unreachable("K&R type lists aren't allowed in C++"); 1814 break; 1815 case Declarator::LambdaExprContext: 1816 llvm_unreachable("Can't specify a type specifier in lambda grammar"); 1817 break; 1818 case Declarator::ObjCParameterContext: 1819 case Declarator::ObjCResultContext: 1820 case Declarator::PrototypeContext: 1821 Error = 0; // Function prototype 1822 break; 1823 case Declarator::MemberContext: 1824 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_static) 1825 break; 1826 switch (cast<TagDecl>(SemaRef.CurContext)->getTagKind()) { 1827 case TTK_Enum: llvm_unreachable("unhandled tag kind"); 1828 case TTK_Struct: Error = 1; /* Struct member */ break; 1829 case TTK_Union: Error = 2; /* Union member */ break; 1830 case TTK_Class: Error = 3; /* Class member */ break; 1831 } 1832 break; 1833 case Declarator::CXXCatchContext: 1834 case Declarator::ObjCCatchContext: 1835 Error = 4; // Exception declaration 1836 break; 1837 case Declarator::TemplateParamContext: 1838 Error = 5; // Template parameter 1839 break; 1840 case Declarator::BlockLiteralContext: 1841 Error = 6; // Block literal 1842 break; 1843 case Declarator::TemplateTypeArgContext: 1844 Error = 7; // Template type argument 1845 break; 1846 case Declarator::AliasDeclContext: 1847 case Declarator::AliasTemplateContext: 1848 Error = 9; // Type alias 1849 break; 1850 case Declarator::TypeNameContext: 1851 Error = 11; // Generic 1852 break; 1853 case Declarator::FileContext: 1854 case Declarator::BlockContext: 1855 case Declarator::ForContext: 1856 case Declarator::ConditionContext: 1857 case Declarator::CXXNewContext: 1858 break; 1859 } 1860 1861 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 1862 Error = 8; 1863 1864 // In Objective-C it is an error to use 'auto' on a function declarator. 1865 if (D.isFunctionDeclarator()) 1866 Error = 10; 1867 1868 // C++0x [dcl.spec.auto]p2: 'auto' is always fine if the declarator 1869 // contains a trailing return type. That is only legal at the outermost 1870 // level. Check all declarator chunks (outermost first) anyway, to give 1871 // better diagnostics. 1872 if (SemaRef.getLangOptions().CPlusPlus0x && Error != -1) { 1873 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 1874 unsigned chunkIndex = e - i - 1; 1875 state.setCurrentChunkIndex(chunkIndex); 1876 DeclaratorChunk &DeclType = D.getTypeObject(chunkIndex); 1877 if (DeclType.Kind == DeclaratorChunk::Function) { 1878 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun; 1879 if (FTI.TrailingReturnType) { 1880 Error = -1; 1881 break; 1882 } 1883 } 1884 } 1885 } 1886 1887 if (Error != -1) { 1888 SemaRef.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 1889 diag::err_auto_not_allowed) 1890 << Error; 1891 T = SemaRef.Context.IntTy; 1892 D.setInvalidType(true); 1893 } else 1894 SemaRef.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 1895 diag::warn_cxx98_compat_auto_type_specifier); 1896 } 1897 1898 if (SemaRef.getLangOptions().CPlusPlus && 1899 OwnedTagDecl && OwnedTagDecl->isCompleteDefinition()) { 1900 // Check the contexts where C++ forbids the declaration of a new class 1901 // or enumeration in a type-specifier-seq. 1902 switch (D.getContext()) { 1903 case Declarator::FileContext: 1904 case Declarator::MemberContext: 1905 case Declarator::BlockContext: 1906 case Declarator::ForContext: 1907 case Declarator::BlockLiteralContext: 1908 case Declarator::LambdaExprContext: 1909 // C++0x [dcl.type]p3: 1910 // A type-specifier-seq shall not define a class or enumeration unless 1911 // it appears in the type-id of an alias-declaration (7.1.3) that is not 1912 // the declaration of a template-declaration. 1913 case Declarator::AliasDeclContext: 1914 break; 1915 case Declarator::AliasTemplateContext: 1916 SemaRef.Diag(OwnedTagDecl->getLocation(), 1917 diag::err_type_defined_in_alias_template) 1918 << SemaRef.Context.getTypeDeclType(OwnedTagDecl); 1919 break; 1920 case Declarator::TypeNameContext: 1921 case Declarator::TemplateParamContext: 1922 case Declarator::CXXNewContext: 1923 case Declarator::CXXCatchContext: 1924 case Declarator::ObjCCatchContext: 1925 case Declarator::TemplateTypeArgContext: 1926 SemaRef.Diag(OwnedTagDecl->getLocation(), 1927 diag::err_type_defined_in_type_specifier) 1928 << SemaRef.Context.getTypeDeclType(OwnedTagDecl); 1929 break; 1930 case Declarator::PrototypeContext: 1931 case Declarator::ObjCParameterContext: 1932 case Declarator::ObjCResultContext: 1933 case Declarator::KNRTypeListContext: 1934 // C++ [dcl.fct]p6: 1935 // Types shall not be defined in return or parameter types. 1936 SemaRef.Diag(OwnedTagDecl->getLocation(), 1937 diag::err_type_defined_in_param_type) 1938 << SemaRef.Context.getTypeDeclType(OwnedTagDecl); 1939 break; 1940 case Declarator::ConditionContext: 1941 // C++ 6.4p2: 1942 // The type-specifier-seq shall not contain typedef and shall not declare 1943 // a new class or enumeration. 1944 SemaRef.Diag(OwnedTagDecl->getLocation(), 1945 diag::err_type_defined_in_condition); 1946 break; 1947 } 1948 } 1949 1950 return T; 1951} 1952 1953static TypeSourceInfo *GetFullTypeForDeclarator(TypeProcessingState &state, 1954 QualType declSpecType, 1955 TypeSourceInfo *TInfo) { 1956 1957 QualType T = declSpecType; 1958 Declarator &D = state.getDeclarator(); 1959 Sema &S = state.getSema(); 1960 ASTContext &Context = S.Context; 1961 const LangOptions &LangOpts = S.getLangOptions(); 1962 1963 bool ImplicitlyNoexcept = false; 1964 if (D.getName().getKind() == UnqualifiedId::IK_OperatorFunctionId && 1965 LangOpts.CPlusPlus0x) { 1966 OverloadedOperatorKind OO = D.getName().OperatorFunctionId.Operator; 1967 /// In C++0x, deallocation functions (normal and array operator delete) 1968 /// are implicitly noexcept. 1969 if (OO == OO_Delete || OO == OO_Array_Delete) 1970 ImplicitlyNoexcept = true; 1971 } 1972 1973 // The name we're declaring, if any. 1974 DeclarationName Name; 1975 if (D.getIdentifier()) 1976 Name = D.getIdentifier(); 1977 1978 // Does this declaration declare a typedef-name? 1979 bool IsTypedefName = 1980 D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef || 1981 D.getContext() == Declarator::AliasDeclContext || 1982 D.getContext() == Declarator::AliasTemplateContext; 1983 1984 // Walk the DeclTypeInfo, building the recursive type as we go. 1985 // DeclTypeInfos are ordered from the identifier out, which is 1986 // opposite of what we want :). 1987 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 1988 unsigned chunkIndex = e - i - 1; 1989 state.setCurrentChunkIndex(chunkIndex); 1990 DeclaratorChunk &DeclType = D.getTypeObject(chunkIndex); 1991 switch (DeclType.Kind) { 1992 case DeclaratorChunk::Paren: 1993 T = S.BuildParenType(T); 1994 break; 1995 case DeclaratorChunk::BlockPointer: 1996 // If blocks are disabled, emit an error. 1997 if (!LangOpts.Blocks) 1998 S.Diag(DeclType.Loc, diag::err_blocks_disable); 1999 2000 T = S.BuildBlockPointerType(T, D.getIdentifierLoc(), Name); 2001 if (DeclType.Cls.TypeQuals) 2002 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Cls.TypeQuals); 2003 break; 2004 case DeclaratorChunk::Pointer: 2005 // Verify that we're not building a pointer to pointer to function with 2006 // exception specification. 2007 if (LangOpts.CPlusPlus && S.CheckDistantExceptionSpec(T)) { 2008 S.Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 2009 D.setInvalidType(true); 2010 // Build the type anyway. 2011 } 2012 if (LangOpts.ObjC1 && T->getAs<ObjCObjectType>()) { 2013 T = Context.getObjCObjectPointerType(T); 2014 if (DeclType.Ptr.TypeQuals) 2015 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Ptr.TypeQuals); 2016 break; 2017 } 2018 T = S.BuildPointerType(T, DeclType.Loc, Name); 2019 if (DeclType.Ptr.TypeQuals) 2020 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Ptr.TypeQuals); 2021 2022 break; 2023 case DeclaratorChunk::Reference: { 2024 // Verify that we're not building a reference to pointer to function with 2025 // exception specification. 2026 if (LangOpts.CPlusPlus && S.CheckDistantExceptionSpec(T)) { 2027 S.Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 2028 D.setInvalidType(true); 2029 // Build the type anyway. 2030 } 2031 T = S.BuildReferenceType(T, DeclType.Ref.LValueRef, DeclType.Loc, Name); 2032 2033 Qualifiers Quals; 2034 if (DeclType.Ref.HasRestrict) 2035 T = S.BuildQualifiedType(T, DeclType.Loc, Qualifiers::Restrict); 2036 break; 2037 } 2038 case DeclaratorChunk::Array: { 2039 // Verify that we're not building an array of pointers to function with 2040 // exception specification. 2041 if (LangOpts.CPlusPlus && S.CheckDistantExceptionSpec(T)) { 2042 S.Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 2043 D.setInvalidType(true); 2044 // Build the type anyway. 2045 } 2046 DeclaratorChunk::ArrayTypeInfo &ATI = DeclType.Arr; 2047 Expr *ArraySize = static_cast<Expr*>(ATI.NumElts); 2048 ArrayType::ArraySizeModifier ASM; 2049 if (ATI.isStar) 2050 ASM = ArrayType::Star; 2051 else if (ATI.hasStatic) 2052 ASM = ArrayType::Static; 2053 else 2054 ASM = ArrayType::Normal; 2055 if (ASM == ArrayType::Star && !D.isPrototypeContext()) { 2056 // FIXME: This check isn't quite right: it allows star in prototypes 2057 // for function definitions, and disallows some edge cases detailed 2058 // in http://gcc.gnu.org/ml/gcc-patches/2009-02/msg00133.html 2059 S.Diag(DeclType.Loc, diag::err_array_star_outside_prototype); 2060 ASM = ArrayType::Normal; 2061 D.setInvalidType(true); 2062 } 2063 T = S.BuildArrayType(T, ASM, ArraySize, ATI.TypeQuals, 2064 SourceRange(DeclType.Loc, DeclType.EndLoc), Name); 2065 break; 2066 } 2067 case DeclaratorChunk::Function: { 2068 // If the function declarator has a prototype (i.e. it is not () and 2069 // does not have a K&R-style identifier list), then the arguments are part 2070 // of the type, otherwise the argument list is (). 2071 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun; 2072 2073 // Check for auto functions and trailing return type and adjust the 2074 // return type accordingly. 2075 if (!D.isInvalidType()) { 2076 // trailing-return-type is only required if we're declaring a function, 2077 // and not, for instance, a pointer to a function. 2078 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto && 2079 !FTI.TrailingReturnType && chunkIndex == 0) { 2080 S.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 2081 diag::err_auto_missing_trailing_return); 2082 T = Context.IntTy; 2083 D.setInvalidType(true); 2084 } else if (FTI.TrailingReturnType) { 2085 // T must be exactly 'auto' at this point. See CWG issue 681. 2086 if (isa<ParenType>(T)) { 2087 S.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 2088 diag::err_trailing_return_in_parens) 2089 << T << D.getDeclSpec().getSourceRange(); 2090 D.setInvalidType(true); 2091 } else if (D.getContext() != Declarator::LambdaExprContext && 2092 (T.hasQualifiers() || !isa<AutoType>(T))) { 2093 S.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 2094 diag::err_trailing_return_without_auto) 2095 << T << D.getDeclSpec().getSourceRange(); 2096 D.setInvalidType(true); 2097 } 2098 2099 T = S.GetTypeFromParser( 2100 ParsedType::getFromOpaquePtr(FTI.TrailingReturnType), 2101 &TInfo); 2102 } 2103 } 2104 2105 // C99 6.7.5.3p1: The return type may not be a function or array type. 2106 // For conversion functions, we'll diagnose this particular error later. 2107 if ((T->isArrayType() || T->isFunctionType()) && 2108 (D.getName().getKind() != UnqualifiedId::IK_ConversionFunctionId)) { 2109 unsigned diagID = diag::err_func_returning_array_function; 2110 // Last processing chunk in block context means this function chunk 2111 // represents the block. 2112 if (chunkIndex == 0 && 2113 D.getContext() == Declarator::BlockLiteralContext) 2114 diagID = diag::err_block_returning_array_function; 2115 S.Diag(DeclType.Loc, diagID) << T->isFunctionType() << T; 2116 T = Context.IntTy; 2117 D.setInvalidType(true); 2118 } 2119 2120 // Do not allow returning half FP value. 2121 // FIXME: This really should be in BuildFunctionType. 2122 if (T->isHalfType()) { 2123 S.Diag(D.getIdentifierLoc(), 2124 diag::err_parameters_retval_cannot_have_fp16_type) << 1 2125 << FixItHint::CreateInsertion(D.getIdentifierLoc(), "*"); 2126 D.setInvalidType(true); 2127 } 2128 2129 // cv-qualifiers on return types are pointless except when the type is a 2130 // class type in C++. 2131 if (isa<PointerType>(T) && T.getLocalCVRQualifiers() && 2132 (D.getName().getKind() != UnqualifiedId::IK_ConversionFunctionId) && 2133 (!LangOpts.CPlusPlus || !T->isDependentType())) { 2134 assert(chunkIndex + 1 < e && "No DeclaratorChunk for the return type?"); 2135 DeclaratorChunk ReturnTypeChunk = D.getTypeObject(chunkIndex + 1); 2136 assert(ReturnTypeChunk.Kind == DeclaratorChunk::Pointer); 2137 2138 DeclaratorChunk::PointerTypeInfo &PTI = ReturnTypeChunk.Ptr; 2139 2140 DiagnoseIgnoredQualifiers(PTI.TypeQuals, 2141 SourceLocation::getFromRawEncoding(PTI.ConstQualLoc), 2142 SourceLocation::getFromRawEncoding(PTI.VolatileQualLoc), 2143 SourceLocation::getFromRawEncoding(PTI.RestrictQualLoc), 2144 S); 2145 2146 } else if (T.getCVRQualifiers() && D.getDeclSpec().getTypeQualifiers() && 2147 (!LangOpts.CPlusPlus || 2148 (!T->isDependentType() && !T->isRecordType()))) { 2149 2150 DiagnoseIgnoredQualifiers(D.getDeclSpec().getTypeQualifiers(), 2151 D.getDeclSpec().getConstSpecLoc(), 2152 D.getDeclSpec().getVolatileSpecLoc(), 2153 D.getDeclSpec().getRestrictSpecLoc(), 2154 S); 2155 } 2156 2157 if (LangOpts.CPlusPlus && D.getDeclSpec().isTypeSpecOwned()) { 2158 // C++ [dcl.fct]p6: 2159 // Types shall not be defined in return or parameter types. 2160 TagDecl *Tag = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 2161 if (Tag->isCompleteDefinition()) 2162 S.Diag(Tag->getLocation(), diag::err_type_defined_in_result_type) 2163 << Context.getTypeDeclType(Tag); 2164 } 2165 2166 // Exception specs are not allowed in typedefs. Complain, but add it 2167 // anyway. 2168 if (IsTypedefName && FTI.getExceptionSpecType()) 2169 S.Diag(FTI.getExceptionSpecLoc(), diag::err_exception_spec_in_typedef) 2170 << (D.getContext() == Declarator::AliasDeclContext || 2171 D.getContext() == Declarator::AliasTemplateContext); 2172 2173 if (!FTI.NumArgs && !FTI.isVariadic && !LangOpts.CPlusPlus) { 2174 // Simple void foo(), where the incoming T is the result type. 2175 T = Context.getFunctionNoProtoType(T); 2176 } else { 2177 // We allow a zero-parameter variadic function in C if the 2178 // function is marked with the "overloadable" attribute. Scan 2179 // for this attribute now. 2180 if (!FTI.NumArgs && FTI.isVariadic && !LangOpts.CPlusPlus) { 2181 bool Overloadable = false; 2182 for (const AttributeList *Attrs = D.getAttributes(); 2183 Attrs; Attrs = Attrs->getNext()) { 2184 if (Attrs->getKind() == AttributeList::AT_overloadable) { 2185 Overloadable = true; 2186 break; 2187 } 2188 } 2189 2190 if (!Overloadable) 2191 S.Diag(FTI.getEllipsisLoc(), diag::err_ellipsis_first_arg); 2192 } 2193 2194 if (FTI.NumArgs && FTI.ArgInfo[0].Param == 0) { 2195 // C99 6.7.5.3p3: Reject int(x,y,z) when it's not a function 2196 // definition. 2197 S.Diag(FTI.ArgInfo[0].IdentLoc, diag::err_ident_list_in_fn_declaration); 2198 D.setInvalidType(true); 2199 break; 2200 } 2201 2202 FunctionProtoType::ExtProtoInfo EPI; 2203 EPI.Variadic = FTI.isVariadic; 2204 EPI.TypeQuals = FTI.TypeQuals; 2205 EPI.RefQualifier = !FTI.hasRefQualifier()? RQ_None 2206 : FTI.RefQualifierIsLValueRef? RQ_LValue 2207 : RQ_RValue; 2208 2209 // Otherwise, we have a function with an argument list that is 2210 // potentially variadic. 2211 SmallVector<QualType, 16> ArgTys; 2212 ArgTys.reserve(FTI.NumArgs); 2213 2214 SmallVector<bool, 16> ConsumedArguments; 2215 ConsumedArguments.reserve(FTI.NumArgs); 2216 bool HasAnyConsumedArguments = false; 2217 2218 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 2219 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 2220 QualType ArgTy = Param->getType(); 2221 assert(!ArgTy.isNull() && "Couldn't parse type?"); 2222 2223 // Adjust the parameter type. 2224 assert((ArgTy == Context.getAdjustedParameterType(ArgTy)) && 2225 "Unadjusted type?"); 2226 2227 // Look for 'void'. void is allowed only as a single argument to a 2228 // function with no other parameters (C99 6.7.5.3p10). We record 2229 // int(void) as a FunctionProtoType with an empty argument list. 2230 if (ArgTy->isVoidType()) { 2231 // If this is something like 'float(int, void)', reject it. 'void' 2232 // is an incomplete type (C99 6.2.5p19) and function decls cannot 2233 // have arguments of incomplete type. 2234 if (FTI.NumArgs != 1 || FTI.isVariadic) { 2235 S.Diag(DeclType.Loc, diag::err_void_only_param); 2236 ArgTy = Context.IntTy; 2237 Param->setType(ArgTy); 2238 } else if (FTI.ArgInfo[i].Ident) { 2239 // Reject, but continue to parse 'int(void abc)'. 2240 S.Diag(FTI.ArgInfo[i].IdentLoc, 2241 diag::err_param_with_void_type); 2242 ArgTy = Context.IntTy; 2243 Param->setType(ArgTy); 2244 } else { 2245 // Reject, but continue to parse 'float(const void)'. 2246 if (ArgTy.hasQualifiers()) 2247 S.Diag(DeclType.Loc, diag::err_void_param_qualified); 2248 2249 // Do not add 'void' to the ArgTys list. 2250 break; 2251 } 2252 } else if (ArgTy->isHalfType()) { 2253 // Disallow half FP arguments. 2254 // FIXME: This really should be in BuildFunctionType. 2255 S.Diag(Param->getLocation(), 2256 diag::err_parameters_retval_cannot_have_fp16_type) << 0 2257 << FixItHint::CreateInsertion(Param->getLocation(), "*"); 2258 D.setInvalidType(); 2259 } else if (!FTI.hasPrototype) { 2260 if (ArgTy->isPromotableIntegerType()) { 2261 ArgTy = Context.getPromotedIntegerType(ArgTy); 2262 Param->setKNRPromoted(true); 2263 } else if (const BuiltinType* BTy = ArgTy->getAs<BuiltinType>()) { 2264 if (BTy->getKind() == BuiltinType::Float) { 2265 ArgTy = Context.DoubleTy; 2266 Param->setKNRPromoted(true); 2267 } 2268 } 2269 } 2270 2271 if (LangOpts.ObjCAutoRefCount) { 2272 bool Consumed = Param->hasAttr<NSConsumedAttr>(); 2273 ConsumedArguments.push_back(Consumed); 2274 HasAnyConsumedArguments |= Consumed; 2275 } 2276 2277 ArgTys.push_back(ArgTy); 2278 } 2279 2280 if (HasAnyConsumedArguments) 2281 EPI.ConsumedArguments = ConsumedArguments.data(); 2282 2283 SmallVector<QualType, 4> Exceptions; 2284 EPI.ExceptionSpecType = FTI.getExceptionSpecType(); 2285 if (FTI.getExceptionSpecType() == EST_Dynamic) { 2286 Exceptions.reserve(FTI.NumExceptions); 2287 for (unsigned ei = 0, ee = FTI.NumExceptions; ei != ee; ++ei) { 2288 // FIXME: Preserve type source info. 2289 QualType ET = S.GetTypeFromParser(FTI.Exceptions[ei].Ty); 2290 // Check that the type is valid for an exception spec, and 2291 // drop it if not. 2292 if (!S.CheckSpecifiedExceptionType(ET, FTI.Exceptions[ei].Range)) 2293 Exceptions.push_back(ET); 2294 } 2295 EPI.NumExceptions = Exceptions.size(); 2296 EPI.Exceptions = Exceptions.data(); 2297 } else if (FTI.getExceptionSpecType() == EST_ComputedNoexcept) { 2298 // If an error occurred, there's no expression here. 2299 if (Expr *NoexceptExpr = FTI.NoexceptExpr) { 2300 assert((NoexceptExpr->isTypeDependent() || 2301 NoexceptExpr->getType()->getCanonicalTypeUnqualified() == 2302 Context.BoolTy) && 2303 "Parser should have made sure that the expression is boolean"); 2304 SourceLocation ErrLoc; 2305 llvm::APSInt Dummy; 2306 if (!NoexceptExpr->isValueDependent() && 2307 !NoexceptExpr->isIntegerConstantExpr(Dummy, Context, &ErrLoc, 2308 /*evaluated*/false)) 2309 S.Diag(ErrLoc, diag::err_noexcept_needs_constant_expression) 2310 << NoexceptExpr->getSourceRange(); 2311 else 2312 EPI.NoexceptExpr = NoexceptExpr; 2313 } 2314 } else if (FTI.getExceptionSpecType() == EST_None && 2315 ImplicitlyNoexcept && chunkIndex == 0) { 2316 // Only the outermost chunk is marked noexcept, of course. 2317 EPI.ExceptionSpecType = EST_BasicNoexcept; 2318 } 2319 2320 T = Context.getFunctionType(T, ArgTys.data(), ArgTys.size(), EPI); 2321 } 2322 2323 break; 2324 } 2325 case DeclaratorChunk::MemberPointer: 2326 // The scope spec must refer to a class, or be dependent. 2327 CXXScopeSpec &SS = DeclType.Mem.Scope(); 2328 QualType ClsType; 2329 if (SS.isInvalid()) { 2330 // Avoid emitting extra errors if we already errored on the scope. 2331 D.setInvalidType(true); 2332 } else if (S.isDependentScopeSpecifier(SS) || 2333 dyn_cast_or_null<CXXRecordDecl>(S.computeDeclContext(SS))) { 2334 NestedNameSpecifier *NNS 2335 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 2336 NestedNameSpecifier *NNSPrefix = NNS->getPrefix(); 2337 switch (NNS->getKind()) { 2338 case NestedNameSpecifier::Identifier: 2339 ClsType = Context.getDependentNameType(ETK_None, NNSPrefix, 2340 NNS->getAsIdentifier()); 2341 break; 2342 2343 case NestedNameSpecifier::Namespace: 2344 case NestedNameSpecifier::NamespaceAlias: 2345 case NestedNameSpecifier::Global: 2346 llvm_unreachable("Nested-name-specifier must name a type"); 2347 break; 2348 2349 case NestedNameSpecifier::TypeSpec: 2350 case NestedNameSpecifier::TypeSpecWithTemplate: 2351 ClsType = QualType(NNS->getAsType(), 0); 2352 // Note: if the NNS has a prefix and ClsType is a nondependent 2353 // TemplateSpecializationType, then the NNS prefix is NOT included 2354 // in ClsType; hence we wrap ClsType into an ElaboratedType. 2355 // NOTE: in particular, no wrap occurs if ClsType already is an 2356 // Elaborated, DependentName, or DependentTemplateSpecialization. 2357 if (NNSPrefix && isa<TemplateSpecializationType>(NNS->getAsType())) 2358 ClsType = Context.getElaboratedType(ETK_None, NNSPrefix, ClsType); 2359 break; 2360 } 2361 } else { 2362 S.Diag(DeclType.Mem.Scope().getBeginLoc(), 2363 diag::err_illegal_decl_mempointer_in_nonclass) 2364 << (D.getIdentifier() ? D.getIdentifier()->getName() : "type name") 2365 << DeclType.Mem.Scope().getRange(); 2366 D.setInvalidType(true); 2367 } 2368 2369 if (!ClsType.isNull()) 2370 T = S.BuildMemberPointerType(T, ClsType, DeclType.Loc, D.getIdentifier()); 2371 if (T.isNull()) { 2372 T = Context.IntTy; 2373 D.setInvalidType(true); 2374 } else if (DeclType.Mem.TypeQuals) { 2375 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Mem.TypeQuals); 2376 } 2377 break; 2378 } 2379 2380 if (T.isNull()) { 2381 D.setInvalidType(true); 2382 T = Context.IntTy; 2383 } 2384 2385 // See if there are any attributes on this declarator chunk. 2386 if (AttributeList *attrs = const_cast<AttributeList*>(DeclType.getAttrs())) 2387 processTypeAttrs(state, T, false, attrs); 2388 } 2389 2390 if (LangOpts.CPlusPlus && T->isFunctionType()) { 2391 const FunctionProtoType *FnTy = T->getAs<FunctionProtoType>(); 2392 assert(FnTy && "Why oh why is there not a FunctionProtoType here?"); 2393 2394 // C++ 8.3.5p4: 2395 // A cv-qualifier-seq shall only be part of the function type 2396 // for a nonstatic member function, the function type to which a pointer 2397 // to member refers, or the top-level function type of a function typedef 2398 // declaration. 2399 // 2400 // Core issue 547 also allows cv-qualifiers on function types that are 2401 // top-level template type arguments. 2402 bool FreeFunction; 2403 if (!D.getCXXScopeSpec().isSet()) { 2404 FreeFunction = ((D.getContext() != Declarator::MemberContext && 2405 D.getContext() != Declarator::LambdaExprContext) || 2406 D.getDeclSpec().isFriendSpecified()); 2407 } else { 2408 DeclContext *DC = S.computeDeclContext(D.getCXXScopeSpec()); 2409 FreeFunction = (DC && !DC->isRecord()); 2410 } 2411 2412 // C++0x [dcl.constexpr]p8: A constexpr specifier for a non-static member 2413 // function that is not a constructor declares that function to be const. 2414 if (D.getDeclSpec().isConstexprSpecified() && !FreeFunction && 2415 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static && 2416 D.getName().getKind() != UnqualifiedId::IK_ConstructorName && 2417 D.getName().getKind() != UnqualifiedId::IK_ConstructorTemplateId && 2418 !(FnTy->getTypeQuals() & DeclSpec::TQ_const)) { 2419 // Rebuild function type adding a 'const' qualifier. 2420 FunctionProtoType::ExtProtoInfo EPI = FnTy->getExtProtoInfo(); 2421 EPI.TypeQuals |= DeclSpec::TQ_const; 2422 T = Context.getFunctionType(FnTy->getResultType(), 2423 FnTy->arg_type_begin(), 2424 FnTy->getNumArgs(), EPI); 2425 } 2426 2427 // C++0x [dcl.fct]p6: 2428 // A ref-qualifier shall only be part of the function type for a 2429 // non-static member function, the function type to which a pointer to 2430 // member refers, or the top-level function type of a function typedef 2431 // declaration. 2432 if ((FnTy->getTypeQuals() != 0 || FnTy->getRefQualifier()) && 2433 !(D.getContext() == Declarator::TemplateTypeArgContext && 2434 !D.isFunctionDeclarator()) && !IsTypedefName && 2435 (FreeFunction || 2436 D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_static)) { 2437 if (D.getContext() == Declarator::TemplateTypeArgContext) { 2438 // Accept qualified function types as template type arguments as a GNU 2439 // extension. This is also the subject of C++ core issue 547. 2440 std::string Quals; 2441 if (FnTy->getTypeQuals() != 0) 2442 Quals = Qualifiers::fromCVRMask(FnTy->getTypeQuals()).getAsString(); 2443 2444 switch (FnTy->getRefQualifier()) { 2445 case RQ_None: 2446 break; 2447 2448 case RQ_LValue: 2449 if (!Quals.empty()) 2450 Quals += ' '; 2451 Quals += '&'; 2452 break; 2453 2454 case RQ_RValue: 2455 if (!Quals.empty()) 2456 Quals += ' '; 2457 Quals += "&&"; 2458 break; 2459 } 2460 2461 S.Diag(D.getIdentifierLoc(), 2462 diag::ext_qualified_function_type_template_arg) 2463 << Quals; 2464 } else { 2465 if (FnTy->getTypeQuals() != 0) { 2466 if (D.isFunctionDeclarator()) { 2467 SourceRange Range = D.getIdentifierLoc(); 2468 for (unsigned I = 0, N = D.getNumTypeObjects(); I != N; ++I) { 2469 const DeclaratorChunk &Chunk = D.getTypeObject(N-I-1); 2470 if (Chunk.Kind == DeclaratorChunk::Function && 2471 Chunk.Fun.TypeQuals != 0) { 2472 switch (Chunk.Fun.TypeQuals) { 2473 case Qualifiers::Const: 2474 Range = Chunk.Fun.getConstQualifierLoc(); 2475 break; 2476 case Qualifiers::Volatile: 2477 Range = Chunk.Fun.getVolatileQualifierLoc(); 2478 break; 2479 case Qualifiers::Const | Qualifiers::Volatile: { 2480 SourceLocation CLoc = Chunk.Fun.getConstQualifierLoc(); 2481 SourceLocation VLoc = Chunk.Fun.getVolatileQualifierLoc(); 2482 if (S.getSourceManager() 2483 .isBeforeInTranslationUnit(CLoc, VLoc)) { 2484 Range = SourceRange(CLoc, VLoc); 2485 } else { 2486 Range = SourceRange(VLoc, CLoc); 2487 } 2488 } 2489 break; 2490 } 2491 break; 2492 } 2493 } 2494 S.Diag(Range.getBegin(), diag::err_invalid_qualified_function_type) 2495 << FixItHint::CreateRemoval(Range); 2496 } else 2497 S.Diag(D.getIdentifierLoc(), 2498 diag::err_invalid_qualified_typedef_function_type_use) 2499 << FreeFunction; 2500 } 2501 2502 if (FnTy->getRefQualifier()) { 2503 if (D.isFunctionDeclarator()) { 2504 SourceLocation Loc = D.getIdentifierLoc(); 2505 for (unsigned I = 0, N = D.getNumTypeObjects(); I != N; ++I) { 2506 const DeclaratorChunk &Chunk = D.getTypeObject(N-I-1); 2507 if (Chunk.Kind == DeclaratorChunk::Function && 2508 Chunk.Fun.hasRefQualifier()) { 2509 Loc = Chunk.Fun.getRefQualifierLoc(); 2510 break; 2511 } 2512 } 2513 2514 S.Diag(Loc, diag::err_invalid_ref_qualifier_function_type) 2515 << (FnTy->getRefQualifier() == RQ_LValue) 2516 << FixItHint::CreateRemoval(Loc); 2517 } else { 2518 S.Diag(D.getIdentifierLoc(), 2519 diag::err_invalid_ref_qualifier_typedef_function_type_use) 2520 << FreeFunction 2521 << (FnTy->getRefQualifier() == RQ_LValue); 2522 } 2523 } 2524 2525 // Strip the cv-qualifiers and ref-qualifiers from the type. 2526 FunctionProtoType::ExtProtoInfo EPI = FnTy->getExtProtoInfo(); 2527 EPI.TypeQuals = 0; 2528 EPI.RefQualifier = RQ_None; 2529 2530 T = Context.getFunctionType(FnTy->getResultType(), 2531 FnTy->arg_type_begin(), 2532 FnTy->getNumArgs(), EPI); 2533 } 2534 } 2535 } 2536 2537 // Apply any undistributed attributes from the declarator. 2538 if (!T.isNull()) 2539 if (AttributeList *attrs = D.getAttributes()) 2540 processTypeAttrs(state, T, false, attrs); 2541 2542 // Diagnose any ignored type attributes. 2543 if (!T.isNull()) state.diagnoseIgnoredTypeAttrs(T); 2544 2545 // C++0x [dcl.constexpr]p9: 2546 // A constexpr specifier used in an object declaration declares the object 2547 // as const. 2548 if (D.getDeclSpec().isConstexprSpecified() && T->isObjectType()) { 2549 T.addConst(); 2550 } 2551 2552 // If there was an ellipsis in the declarator, the declaration declares a 2553 // parameter pack whose type may be a pack expansion type. 2554 if (D.hasEllipsis() && !T.isNull()) { 2555 // C++0x [dcl.fct]p13: 2556 // A declarator-id or abstract-declarator containing an ellipsis shall 2557 // only be used in a parameter-declaration. Such a parameter-declaration 2558 // is a parameter pack (14.5.3). [...] 2559 switch (D.getContext()) { 2560 case Declarator::PrototypeContext: 2561 // C++0x [dcl.fct]p13: 2562 // [...] When it is part of a parameter-declaration-clause, the 2563 // parameter pack is a function parameter pack (14.5.3). The type T 2564 // of the declarator-id of the function parameter pack shall contain 2565 // a template parameter pack; each template parameter pack in T is 2566 // expanded by the function parameter pack. 2567 // 2568 // We represent function parameter packs as function parameters whose 2569 // type is a pack expansion. 2570 if (!T->containsUnexpandedParameterPack()) { 2571 S.Diag(D.getEllipsisLoc(), 2572 diag::err_function_parameter_pack_without_parameter_packs) 2573 << T << D.getSourceRange(); 2574 D.setEllipsisLoc(SourceLocation()); 2575 } else { 2576 T = Context.getPackExpansionType(T, llvm::Optional<unsigned>()); 2577 } 2578 break; 2579 2580 case Declarator::TemplateParamContext: 2581 // C++0x [temp.param]p15: 2582 // If a template-parameter is a [...] is a parameter-declaration that 2583 // declares a parameter pack (8.3.5), then the template-parameter is a 2584 // template parameter pack (14.5.3). 2585 // 2586 // Note: core issue 778 clarifies that, if there are any unexpanded 2587 // parameter packs in the type of the non-type template parameter, then 2588 // it expands those parameter packs. 2589 if (T->containsUnexpandedParameterPack()) 2590 T = Context.getPackExpansionType(T, llvm::Optional<unsigned>()); 2591 else 2592 S.Diag(D.getEllipsisLoc(), 2593 LangOpts.CPlusPlus0x 2594 ? diag::warn_cxx98_compat_variadic_templates 2595 : diag::ext_variadic_templates); 2596 break; 2597 2598 case Declarator::FileContext: 2599 case Declarator::KNRTypeListContext: 2600 case Declarator::ObjCParameterContext: // FIXME: special diagnostic here? 2601 case Declarator::ObjCResultContext: // FIXME: special diagnostic here? 2602 case Declarator::TypeNameContext: 2603 case Declarator::CXXNewContext: 2604 case Declarator::AliasDeclContext: 2605 case Declarator::AliasTemplateContext: 2606 case Declarator::MemberContext: 2607 case Declarator::BlockContext: 2608 case Declarator::ForContext: 2609 case Declarator::ConditionContext: 2610 case Declarator::CXXCatchContext: 2611 case Declarator::ObjCCatchContext: 2612 case Declarator::BlockLiteralContext: 2613 case Declarator::LambdaExprContext: 2614 case Declarator::TemplateTypeArgContext: 2615 // FIXME: We may want to allow parameter packs in block-literal contexts 2616 // in the future. 2617 S.Diag(D.getEllipsisLoc(), diag::err_ellipsis_in_declarator_not_parameter); 2618 D.setEllipsisLoc(SourceLocation()); 2619 break; 2620 } 2621 } 2622 2623 if (T.isNull()) 2624 return Context.getNullTypeSourceInfo(); 2625 else if (D.isInvalidType()) 2626 return Context.getTrivialTypeSourceInfo(T); 2627 2628 return S.GetTypeSourceInfoForDeclarator(D, T, TInfo); 2629} 2630 2631/// GetTypeForDeclarator - Convert the type for the specified 2632/// declarator to Type instances. 2633/// 2634/// The result of this call will never be null, but the associated 2635/// type may be a null type if there's an unrecoverable error. 2636TypeSourceInfo *Sema::GetTypeForDeclarator(Declarator &D, Scope *S) { 2637 // Determine the type of the declarator. Not all forms of declarator 2638 // have a type. 2639 2640 TypeProcessingState state(*this, D); 2641 2642 TypeSourceInfo *ReturnTypeInfo = 0; 2643 QualType T = GetDeclSpecTypeForDeclarator(state, ReturnTypeInfo); 2644 if (T.isNull()) 2645 return Context.getNullTypeSourceInfo(); 2646 2647 if (D.isPrototypeContext() && getLangOptions().ObjCAutoRefCount) 2648 inferARCWriteback(state, T); 2649 2650 return GetFullTypeForDeclarator(state, T, ReturnTypeInfo); 2651} 2652 2653static void transferARCOwnershipToDeclSpec(Sema &S, 2654 QualType &declSpecTy, 2655 Qualifiers::ObjCLifetime ownership) { 2656 if (declSpecTy->isObjCRetainableType() && 2657 declSpecTy.getObjCLifetime() == Qualifiers::OCL_None) { 2658 Qualifiers qs; 2659 qs.addObjCLifetime(ownership); 2660 declSpecTy = S.Context.getQualifiedType(declSpecTy, qs); 2661 } 2662} 2663 2664static void transferARCOwnershipToDeclaratorChunk(TypeProcessingState &state, 2665 Qualifiers::ObjCLifetime ownership, 2666 unsigned chunkIndex) { 2667 Sema &S = state.getSema(); 2668 Declarator &D = state.getDeclarator(); 2669 2670 // Look for an explicit lifetime attribute. 2671 DeclaratorChunk &chunk = D.getTypeObject(chunkIndex); 2672 for (const AttributeList *attr = chunk.getAttrs(); attr; 2673 attr = attr->getNext()) 2674 if (attr->getKind() == AttributeList::AT_objc_ownership) 2675 return; 2676 2677 const char *attrStr = 0; 2678 switch (ownership) { 2679 case Qualifiers::OCL_None: llvm_unreachable("no ownership!"); break; 2680 case Qualifiers::OCL_ExplicitNone: attrStr = "none"; break; 2681 case Qualifiers::OCL_Strong: attrStr = "strong"; break; 2682 case Qualifiers::OCL_Weak: attrStr = "weak"; break; 2683 case Qualifiers::OCL_Autoreleasing: attrStr = "autoreleasing"; break; 2684 } 2685 2686 // If there wasn't one, add one (with an invalid source location 2687 // so that we don't make an AttributedType for it). 2688 AttributeList *attr = D.getAttributePool() 2689 .create(&S.Context.Idents.get("objc_ownership"), SourceLocation(), 2690 /*scope*/ 0, SourceLocation(), 2691 &S.Context.Idents.get(attrStr), SourceLocation(), 2692 /*args*/ 0, 0, 2693 /*declspec*/ false, /*C++0x*/ false); 2694 spliceAttrIntoList(*attr, chunk.getAttrListRef()); 2695 2696 // TODO: mark whether we did this inference? 2697} 2698 2699/// \brief Used for transfering ownership in casts resulting in l-values. 2700static void transferARCOwnership(TypeProcessingState &state, 2701 QualType &declSpecTy, 2702 Qualifiers::ObjCLifetime ownership) { 2703 Sema &S = state.getSema(); 2704 Declarator &D = state.getDeclarator(); 2705 2706 int inner = -1; 2707 bool hasIndirection = false; 2708 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 2709 DeclaratorChunk &chunk = D.getTypeObject(i); 2710 switch (chunk.Kind) { 2711 case DeclaratorChunk::Paren: 2712 // Ignore parens. 2713 break; 2714 2715 case DeclaratorChunk::Array: 2716 case DeclaratorChunk::Reference: 2717 case DeclaratorChunk::Pointer: 2718 if (inner != -1) 2719 hasIndirection = true; 2720 inner = i; 2721 break; 2722 2723 case DeclaratorChunk::BlockPointer: 2724 if (inner != -1) 2725 transferARCOwnershipToDeclaratorChunk(state, ownership, i); 2726 return; 2727 2728 case DeclaratorChunk::Function: 2729 case DeclaratorChunk::MemberPointer: 2730 return; 2731 } 2732 } 2733 2734 if (inner == -1) 2735 return; 2736 2737 DeclaratorChunk &chunk = D.getTypeObject(inner); 2738 if (chunk.Kind == DeclaratorChunk::Pointer) { 2739 if (declSpecTy->isObjCRetainableType()) 2740 return transferARCOwnershipToDeclSpec(S, declSpecTy, ownership); 2741 if (declSpecTy->isObjCObjectType() && hasIndirection) 2742 return transferARCOwnershipToDeclaratorChunk(state, ownership, inner); 2743 } else { 2744 assert(chunk.Kind == DeclaratorChunk::Array || 2745 chunk.Kind == DeclaratorChunk::Reference); 2746 return transferARCOwnershipToDeclSpec(S, declSpecTy, ownership); 2747 } 2748} 2749 2750TypeSourceInfo *Sema::GetTypeForDeclaratorCast(Declarator &D, QualType FromTy) { 2751 TypeProcessingState state(*this, D); 2752 2753 TypeSourceInfo *ReturnTypeInfo = 0; 2754 QualType declSpecTy = GetDeclSpecTypeForDeclarator(state, ReturnTypeInfo); 2755 if (declSpecTy.isNull()) 2756 return Context.getNullTypeSourceInfo(); 2757 2758 if (getLangOptions().ObjCAutoRefCount) { 2759 Qualifiers::ObjCLifetime ownership = Context.getInnerObjCOwnership(FromTy); 2760 if (ownership != Qualifiers::OCL_None) 2761 transferARCOwnership(state, declSpecTy, ownership); 2762 } 2763 2764 return GetFullTypeForDeclarator(state, declSpecTy, ReturnTypeInfo); 2765} 2766 2767/// Map an AttributedType::Kind to an AttributeList::Kind. 2768static AttributeList::Kind getAttrListKind(AttributedType::Kind kind) { 2769 switch (kind) { 2770 case AttributedType::attr_address_space: 2771 return AttributeList::AT_address_space; 2772 case AttributedType::attr_regparm: 2773 return AttributeList::AT_regparm; 2774 case AttributedType::attr_vector_size: 2775 return AttributeList::AT_vector_size; 2776 case AttributedType::attr_neon_vector_type: 2777 return AttributeList::AT_neon_vector_type; 2778 case AttributedType::attr_neon_polyvector_type: 2779 return AttributeList::AT_neon_polyvector_type; 2780 case AttributedType::attr_objc_gc: 2781 return AttributeList::AT_objc_gc; 2782 case AttributedType::attr_objc_ownership: 2783 return AttributeList::AT_objc_ownership; 2784 case AttributedType::attr_noreturn: 2785 return AttributeList::AT_noreturn; 2786 case AttributedType::attr_cdecl: 2787 return AttributeList::AT_cdecl; 2788 case AttributedType::attr_fastcall: 2789 return AttributeList::AT_fastcall; 2790 case AttributedType::attr_stdcall: 2791 return AttributeList::AT_stdcall; 2792 case AttributedType::attr_thiscall: 2793 return AttributeList::AT_thiscall; 2794 case AttributedType::attr_pascal: 2795 return AttributeList::AT_pascal; 2796 case AttributedType::attr_pcs: 2797 return AttributeList::AT_pcs; 2798 } 2799 llvm_unreachable("unexpected attribute kind!"); 2800 return AttributeList::Kind(); 2801} 2802 2803static void fillAttributedTypeLoc(AttributedTypeLoc TL, 2804 const AttributeList *attrs) { 2805 AttributedType::Kind kind = TL.getAttrKind(); 2806 2807 assert(attrs && "no type attributes in the expected location!"); 2808 AttributeList::Kind parsedKind = getAttrListKind(kind); 2809 while (attrs->getKind() != parsedKind) { 2810 attrs = attrs->getNext(); 2811 assert(attrs && "no matching attribute in expected location!"); 2812 } 2813 2814 TL.setAttrNameLoc(attrs->getLoc()); 2815 if (TL.hasAttrExprOperand()) 2816 TL.setAttrExprOperand(attrs->getArg(0)); 2817 else if (TL.hasAttrEnumOperand()) 2818 TL.setAttrEnumOperandLoc(attrs->getParameterLoc()); 2819 2820 // FIXME: preserve this information to here. 2821 if (TL.hasAttrOperand()) 2822 TL.setAttrOperandParensRange(SourceRange()); 2823} 2824 2825namespace { 2826 class TypeSpecLocFiller : public TypeLocVisitor<TypeSpecLocFiller> { 2827 ASTContext &Context; 2828 const DeclSpec &DS; 2829 2830 public: 2831 TypeSpecLocFiller(ASTContext &Context, const DeclSpec &DS) 2832 : Context(Context), DS(DS) {} 2833 2834 void VisitAttributedTypeLoc(AttributedTypeLoc TL) { 2835 fillAttributedTypeLoc(TL, DS.getAttributes().getList()); 2836 Visit(TL.getModifiedLoc()); 2837 } 2838 void VisitQualifiedTypeLoc(QualifiedTypeLoc TL) { 2839 Visit(TL.getUnqualifiedLoc()); 2840 } 2841 void VisitTypedefTypeLoc(TypedefTypeLoc TL) { 2842 TL.setNameLoc(DS.getTypeSpecTypeLoc()); 2843 } 2844 void VisitObjCInterfaceTypeLoc(ObjCInterfaceTypeLoc TL) { 2845 TL.setNameLoc(DS.getTypeSpecTypeLoc()); 2846 } 2847 void VisitObjCObjectTypeLoc(ObjCObjectTypeLoc TL) { 2848 // Handle the base type, which might not have been written explicitly. 2849 if (DS.getTypeSpecType() == DeclSpec::TST_unspecified) { 2850 TL.setHasBaseTypeAsWritten(false); 2851 TL.getBaseLoc().initialize(Context, SourceLocation()); 2852 } else { 2853 TL.setHasBaseTypeAsWritten(true); 2854 Visit(TL.getBaseLoc()); 2855 } 2856 2857 // Protocol qualifiers. 2858 if (DS.getProtocolQualifiers()) { 2859 assert(TL.getNumProtocols() > 0); 2860 assert(TL.getNumProtocols() == DS.getNumProtocolQualifiers()); 2861 TL.setLAngleLoc(DS.getProtocolLAngleLoc()); 2862 TL.setRAngleLoc(DS.getSourceRange().getEnd()); 2863 for (unsigned i = 0, e = DS.getNumProtocolQualifiers(); i != e; ++i) 2864 TL.setProtocolLoc(i, DS.getProtocolLocs()[i]); 2865 } else { 2866 assert(TL.getNumProtocols() == 0); 2867 TL.setLAngleLoc(SourceLocation()); 2868 TL.setRAngleLoc(SourceLocation()); 2869 } 2870 } 2871 void VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL) { 2872 TL.setStarLoc(SourceLocation()); 2873 Visit(TL.getPointeeLoc()); 2874 } 2875 void VisitTemplateSpecializationTypeLoc(TemplateSpecializationTypeLoc TL) { 2876 TypeSourceInfo *TInfo = 0; 2877 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 2878 2879 // If we got no declarator info from previous Sema routines, 2880 // just fill with the typespec loc. 2881 if (!TInfo) { 2882 TL.initialize(Context, DS.getTypeSpecTypeNameLoc()); 2883 return; 2884 } 2885 2886 TypeLoc OldTL = TInfo->getTypeLoc(); 2887 if (TInfo->getType()->getAs<ElaboratedType>()) { 2888 ElaboratedTypeLoc ElabTL = cast<ElaboratedTypeLoc>(OldTL); 2889 TemplateSpecializationTypeLoc NamedTL = 2890 cast<TemplateSpecializationTypeLoc>(ElabTL.getNamedTypeLoc()); 2891 TL.copy(NamedTL); 2892 } 2893 else 2894 TL.copy(cast<TemplateSpecializationTypeLoc>(OldTL)); 2895 } 2896 void VisitTypeOfExprTypeLoc(TypeOfExprTypeLoc TL) { 2897 assert(DS.getTypeSpecType() == DeclSpec::TST_typeofExpr); 2898 TL.setTypeofLoc(DS.getTypeSpecTypeLoc()); 2899 TL.setParensRange(DS.getTypeofParensRange()); 2900 } 2901 void VisitTypeOfTypeLoc(TypeOfTypeLoc TL) { 2902 assert(DS.getTypeSpecType() == DeclSpec::TST_typeofType); 2903 TL.setTypeofLoc(DS.getTypeSpecTypeLoc()); 2904 TL.setParensRange(DS.getTypeofParensRange()); 2905 assert(DS.getRepAsType()); 2906 TypeSourceInfo *TInfo = 0; 2907 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 2908 TL.setUnderlyingTInfo(TInfo); 2909 } 2910 void VisitUnaryTransformTypeLoc(UnaryTransformTypeLoc TL) { 2911 // FIXME: This holds only because we only have one unary transform. 2912 assert(DS.getTypeSpecType() == DeclSpec::TST_underlyingType); 2913 TL.setKWLoc(DS.getTypeSpecTypeLoc()); 2914 TL.setParensRange(DS.getTypeofParensRange()); 2915 assert(DS.getRepAsType()); 2916 TypeSourceInfo *TInfo = 0; 2917 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 2918 TL.setUnderlyingTInfo(TInfo); 2919 } 2920 void VisitBuiltinTypeLoc(BuiltinTypeLoc TL) { 2921 // By default, use the source location of the type specifier. 2922 TL.setBuiltinLoc(DS.getTypeSpecTypeLoc()); 2923 if (TL.needsExtraLocalData()) { 2924 // Set info for the written builtin specifiers. 2925 TL.getWrittenBuiltinSpecs() = DS.getWrittenBuiltinSpecs(); 2926 // Try to have a meaningful source location. 2927 if (TL.getWrittenSignSpec() != TSS_unspecified) 2928 // Sign spec loc overrides the others (e.g., 'unsigned long'). 2929 TL.setBuiltinLoc(DS.getTypeSpecSignLoc()); 2930 else if (TL.getWrittenWidthSpec() != TSW_unspecified) 2931 // Width spec loc overrides type spec loc (e.g., 'short int'). 2932 TL.setBuiltinLoc(DS.getTypeSpecWidthLoc()); 2933 } 2934 } 2935 void VisitElaboratedTypeLoc(ElaboratedTypeLoc TL) { 2936 ElaboratedTypeKeyword Keyword 2937 = TypeWithKeyword::getKeywordForTypeSpec(DS.getTypeSpecType()); 2938 if (DS.getTypeSpecType() == TST_typename) { 2939 TypeSourceInfo *TInfo = 0; 2940 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 2941 if (TInfo) { 2942 TL.copy(cast<ElaboratedTypeLoc>(TInfo->getTypeLoc())); 2943 return; 2944 } 2945 } 2946 TL.setKeywordLoc(Keyword != ETK_None 2947 ? DS.getTypeSpecTypeLoc() 2948 : SourceLocation()); 2949 const CXXScopeSpec& SS = DS.getTypeSpecScope(); 2950 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 2951 Visit(TL.getNextTypeLoc().getUnqualifiedLoc()); 2952 } 2953 void VisitDependentNameTypeLoc(DependentNameTypeLoc TL) { 2954 ElaboratedTypeKeyword Keyword 2955 = TypeWithKeyword::getKeywordForTypeSpec(DS.getTypeSpecType()); 2956 if (DS.getTypeSpecType() == TST_typename) { 2957 TypeSourceInfo *TInfo = 0; 2958 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 2959 if (TInfo) { 2960 TL.copy(cast<DependentNameTypeLoc>(TInfo->getTypeLoc())); 2961 return; 2962 } 2963 } 2964 TL.setKeywordLoc(Keyword != ETK_None 2965 ? DS.getTypeSpecTypeLoc() 2966 : SourceLocation()); 2967 const CXXScopeSpec& SS = DS.getTypeSpecScope(); 2968 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 2969 TL.setNameLoc(DS.getTypeSpecTypeNameLoc()); 2970 } 2971 void VisitDependentTemplateSpecializationTypeLoc( 2972 DependentTemplateSpecializationTypeLoc TL) { 2973 ElaboratedTypeKeyword Keyword 2974 = TypeWithKeyword::getKeywordForTypeSpec(DS.getTypeSpecType()); 2975 if (Keyword == ETK_Typename) { 2976 TypeSourceInfo *TInfo = 0; 2977 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 2978 if (TInfo) { 2979 TL.copy(cast<DependentTemplateSpecializationTypeLoc>( 2980 TInfo->getTypeLoc())); 2981 return; 2982 } 2983 } 2984 TL.initializeLocal(Context, SourceLocation()); 2985 TL.setKeywordLoc(Keyword != ETK_None 2986 ? DS.getTypeSpecTypeLoc() 2987 : SourceLocation()); 2988 const CXXScopeSpec& SS = DS.getTypeSpecScope(); 2989 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 2990 TL.setNameLoc(DS.getTypeSpecTypeNameLoc()); 2991 } 2992 void VisitTagTypeLoc(TagTypeLoc TL) { 2993 TL.setNameLoc(DS.getTypeSpecTypeNameLoc()); 2994 } 2995 void VisitAtomicTypeLoc(AtomicTypeLoc TL) { 2996 TL.setKWLoc(DS.getTypeSpecTypeLoc()); 2997 TL.setParensRange(DS.getTypeofParensRange()); 2998 2999 TypeSourceInfo *TInfo = 0; 3000 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 3001 TL.getValueLoc().initializeFullCopy(TInfo->getTypeLoc()); 3002 } 3003 3004 void VisitTypeLoc(TypeLoc TL) { 3005 // FIXME: add other typespec types and change this to an assert. 3006 TL.initialize(Context, DS.getTypeSpecTypeLoc()); 3007 } 3008 }; 3009 3010 class DeclaratorLocFiller : public TypeLocVisitor<DeclaratorLocFiller> { 3011 ASTContext &Context; 3012 const DeclaratorChunk &Chunk; 3013 3014 public: 3015 DeclaratorLocFiller(ASTContext &Context, const DeclaratorChunk &Chunk) 3016 : Context(Context), Chunk(Chunk) {} 3017 3018 void VisitQualifiedTypeLoc(QualifiedTypeLoc TL) { 3019 llvm_unreachable("qualified type locs not expected here!"); 3020 } 3021 3022 void VisitAttributedTypeLoc(AttributedTypeLoc TL) { 3023 fillAttributedTypeLoc(TL, Chunk.getAttrs()); 3024 } 3025 void VisitBlockPointerTypeLoc(BlockPointerTypeLoc TL) { 3026 assert(Chunk.Kind == DeclaratorChunk::BlockPointer); 3027 TL.setCaretLoc(Chunk.Loc); 3028 } 3029 void VisitPointerTypeLoc(PointerTypeLoc TL) { 3030 assert(Chunk.Kind == DeclaratorChunk::Pointer); 3031 TL.setStarLoc(Chunk.Loc); 3032 } 3033 void VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL) { 3034 assert(Chunk.Kind == DeclaratorChunk::Pointer); 3035 TL.setStarLoc(Chunk.Loc); 3036 } 3037 void VisitMemberPointerTypeLoc(MemberPointerTypeLoc TL) { 3038 assert(Chunk.Kind == DeclaratorChunk::MemberPointer); 3039 const CXXScopeSpec& SS = Chunk.Mem.Scope(); 3040 NestedNameSpecifierLoc NNSLoc = SS.getWithLocInContext(Context); 3041 3042 const Type* ClsTy = TL.getClass(); 3043 QualType ClsQT = QualType(ClsTy, 0); 3044 TypeSourceInfo *ClsTInfo = Context.CreateTypeSourceInfo(ClsQT, 0); 3045 // Now copy source location info into the type loc component. 3046 TypeLoc ClsTL = ClsTInfo->getTypeLoc(); 3047 switch (NNSLoc.getNestedNameSpecifier()->getKind()) { 3048 case NestedNameSpecifier::Identifier: 3049 assert(isa<DependentNameType>(ClsTy) && "Unexpected TypeLoc"); 3050 { 3051 DependentNameTypeLoc DNTLoc = cast<DependentNameTypeLoc>(ClsTL); 3052 DNTLoc.setKeywordLoc(SourceLocation()); 3053 DNTLoc.setQualifierLoc(NNSLoc.getPrefix()); 3054 DNTLoc.setNameLoc(NNSLoc.getLocalBeginLoc()); 3055 } 3056 break; 3057 3058 case NestedNameSpecifier::TypeSpec: 3059 case NestedNameSpecifier::TypeSpecWithTemplate: 3060 if (isa<ElaboratedType>(ClsTy)) { 3061 ElaboratedTypeLoc ETLoc = *cast<ElaboratedTypeLoc>(&ClsTL); 3062 ETLoc.setKeywordLoc(SourceLocation()); 3063 ETLoc.setQualifierLoc(NNSLoc.getPrefix()); 3064 TypeLoc NamedTL = ETLoc.getNamedTypeLoc(); 3065 NamedTL.initializeFullCopy(NNSLoc.getTypeLoc()); 3066 } else { 3067 ClsTL.initializeFullCopy(NNSLoc.getTypeLoc()); 3068 } 3069 break; 3070 3071 case NestedNameSpecifier::Namespace: 3072 case NestedNameSpecifier::NamespaceAlias: 3073 case NestedNameSpecifier::Global: 3074 llvm_unreachable("Nested-name-specifier must name a type"); 3075 break; 3076 } 3077 3078 // Finally fill in MemberPointerLocInfo fields. 3079 TL.setStarLoc(Chunk.Loc); 3080 TL.setClassTInfo(ClsTInfo); 3081 } 3082 void VisitLValueReferenceTypeLoc(LValueReferenceTypeLoc TL) { 3083 assert(Chunk.Kind == DeclaratorChunk::Reference); 3084 // 'Amp' is misleading: this might have been originally 3085 /// spelled with AmpAmp. 3086 TL.setAmpLoc(Chunk.Loc); 3087 } 3088 void VisitRValueReferenceTypeLoc(RValueReferenceTypeLoc TL) { 3089 assert(Chunk.Kind == DeclaratorChunk::Reference); 3090 assert(!Chunk.Ref.LValueRef); 3091 TL.setAmpAmpLoc(Chunk.Loc); 3092 } 3093 void VisitArrayTypeLoc(ArrayTypeLoc TL) { 3094 assert(Chunk.Kind == DeclaratorChunk::Array); 3095 TL.setLBracketLoc(Chunk.Loc); 3096 TL.setRBracketLoc(Chunk.EndLoc); 3097 TL.setSizeExpr(static_cast<Expr*>(Chunk.Arr.NumElts)); 3098 } 3099 void VisitFunctionTypeLoc(FunctionTypeLoc TL) { 3100 assert(Chunk.Kind == DeclaratorChunk::Function); 3101 TL.setLocalRangeBegin(Chunk.Loc); 3102 TL.setLocalRangeEnd(Chunk.EndLoc); 3103 TL.setTrailingReturn(!!Chunk.Fun.TrailingReturnType); 3104 3105 const DeclaratorChunk::FunctionTypeInfo &FTI = Chunk.Fun; 3106 for (unsigned i = 0, e = TL.getNumArgs(), tpi = 0; i != e; ++i) { 3107 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 3108 TL.setArg(tpi++, Param); 3109 } 3110 // FIXME: exception specs 3111 } 3112 void VisitParenTypeLoc(ParenTypeLoc TL) { 3113 assert(Chunk.Kind == DeclaratorChunk::Paren); 3114 TL.setLParenLoc(Chunk.Loc); 3115 TL.setRParenLoc(Chunk.EndLoc); 3116 } 3117 3118 void VisitTypeLoc(TypeLoc TL) { 3119 llvm_unreachable("unsupported TypeLoc kind in declarator!"); 3120 } 3121 }; 3122} 3123 3124/// \brief Create and instantiate a TypeSourceInfo with type source information. 3125/// 3126/// \param T QualType referring to the type as written in source code. 3127/// 3128/// \param ReturnTypeInfo For declarators whose return type does not show 3129/// up in the normal place in the declaration specifiers (such as a C++ 3130/// conversion function), this pointer will refer to a type source information 3131/// for that return type. 3132TypeSourceInfo * 3133Sema::GetTypeSourceInfoForDeclarator(Declarator &D, QualType T, 3134 TypeSourceInfo *ReturnTypeInfo) { 3135 TypeSourceInfo *TInfo = Context.CreateTypeSourceInfo(T); 3136 UnqualTypeLoc CurrTL = TInfo->getTypeLoc().getUnqualifiedLoc(); 3137 3138 // Handle parameter packs whose type is a pack expansion. 3139 if (isa<PackExpansionType>(T)) { 3140 cast<PackExpansionTypeLoc>(CurrTL).setEllipsisLoc(D.getEllipsisLoc()); 3141 CurrTL = CurrTL.getNextTypeLoc().getUnqualifiedLoc(); 3142 } 3143 3144 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 3145 while (isa<AttributedTypeLoc>(CurrTL)) { 3146 AttributedTypeLoc TL = cast<AttributedTypeLoc>(CurrTL); 3147 fillAttributedTypeLoc(TL, D.getTypeObject(i).getAttrs()); 3148 CurrTL = TL.getNextTypeLoc().getUnqualifiedLoc(); 3149 } 3150 3151 DeclaratorLocFiller(Context, D.getTypeObject(i)).Visit(CurrTL); 3152 CurrTL = CurrTL.getNextTypeLoc().getUnqualifiedLoc(); 3153 } 3154 3155 // If we have different source information for the return type, use 3156 // that. This really only applies to C++ conversion functions. 3157 if (ReturnTypeInfo) { 3158 TypeLoc TL = ReturnTypeInfo->getTypeLoc(); 3159 assert(TL.getFullDataSize() == CurrTL.getFullDataSize()); 3160 memcpy(CurrTL.getOpaqueData(), TL.getOpaqueData(), TL.getFullDataSize()); 3161 } else { 3162 TypeSpecLocFiller(Context, D.getDeclSpec()).Visit(CurrTL); 3163 } 3164 3165 return TInfo; 3166} 3167 3168/// \brief Create a LocInfoType to hold the given QualType and TypeSourceInfo. 3169ParsedType Sema::CreateParsedType(QualType T, TypeSourceInfo *TInfo) { 3170 // FIXME: LocInfoTypes are "transient", only needed for passing to/from Parser 3171 // and Sema during declaration parsing. Try deallocating/caching them when 3172 // it's appropriate, instead of allocating them and keeping them around. 3173 LocInfoType *LocT = (LocInfoType*)BumpAlloc.Allocate(sizeof(LocInfoType), 3174 TypeAlignment); 3175 new (LocT) LocInfoType(T, TInfo); 3176 assert(LocT->getTypeClass() != T->getTypeClass() && 3177 "LocInfoType's TypeClass conflicts with an existing Type class"); 3178 return ParsedType::make(QualType(LocT, 0)); 3179} 3180 3181void LocInfoType::getAsStringInternal(std::string &Str, 3182 const PrintingPolicy &Policy) const { 3183 llvm_unreachable("LocInfoType leaked into the type system; an opaque TypeTy*" 3184 " was used directly instead of getting the QualType through" 3185 " GetTypeFromParser"); 3186} 3187 3188TypeResult Sema::ActOnTypeName(Scope *S, Declarator &D) { 3189 // C99 6.7.6: Type names have no identifier. This is already validated by 3190 // the parser. 3191 assert(D.getIdentifier() == 0 && "Type name should have no identifier!"); 3192 3193 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 3194 QualType T = TInfo->getType(); 3195 if (D.isInvalidType()) 3196 return true; 3197 3198 // Make sure there are no unused decl attributes on the declarator. 3199 // We don't want to do this for ObjC parameters because we're going 3200 // to apply them to the actual parameter declaration. 3201 if (D.getContext() != Declarator::ObjCParameterContext) 3202 checkUnusedDeclAttributes(D); 3203 3204 if (getLangOptions().CPlusPlus) { 3205 // Check that there are no default arguments (C++ only). 3206 CheckExtraCXXDefaultArguments(D); 3207 } 3208 3209 return CreateParsedType(T, TInfo); 3210} 3211 3212ParsedType Sema::ActOnObjCInstanceType(SourceLocation Loc) { 3213 QualType T = Context.getObjCInstanceType(); 3214 TypeSourceInfo *TInfo = Context.getTrivialTypeSourceInfo(T, Loc); 3215 return CreateParsedType(T, TInfo); 3216} 3217 3218 3219//===----------------------------------------------------------------------===// 3220// Type Attribute Processing 3221//===----------------------------------------------------------------------===// 3222 3223/// HandleAddressSpaceTypeAttribute - Process an address_space attribute on the 3224/// specified type. The attribute contains 1 argument, the id of the address 3225/// space for the type. 3226static void HandleAddressSpaceTypeAttribute(QualType &Type, 3227 const AttributeList &Attr, Sema &S){ 3228 3229 // If this type is already address space qualified, reject it. 3230 // ISO/IEC TR 18037 S5.3 (amending C99 6.7.3): "No type shall be qualified by 3231 // qualifiers for two or more different address spaces." 3232 if (Type.getAddressSpace()) { 3233 S.Diag(Attr.getLoc(), diag::err_attribute_address_multiple_qualifiers); 3234 Attr.setInvalid(); 3235 return; 3236 } 3237 3238 // ISO/IEC TR 18037 S5.3 (amending C99 6.7.3): "A function type shall not be 3239 // qualified by an address-space qualifier." 3240 if (Type->isFunctionType()) { 3241 S.Diag(Attr.getLoc(), diag::err_attribute_address_function_type); 3242 Attr.setInvalid(); 3243 return; 3244 } 3245 3246 // Check the attribute arguments. 3247 if (Attr.getNumArgs() != 1) { 3248 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 3249 Attr.setInvalid(); 3250 return; 3251 } 3252 Expr *ASArgExpr = static_cast<Expr *>(Attr.getArg(0)); 3253 llvm::APSInt addrSpace(32); 3254 if (ASArgExpr->isTypeDependent() || ASArgExpr->isValueDependent() || 3255 !ASArgExpr->isIntegerConstantExpr(addrSpace, S.Context)) { 3256 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_not_int) 3257 << ASArgExpr->getSourceRange(); 3258 Attr.setInvalid(); 3259 return; 3260 } 3261 3262 // Bounds checking. 3263 if (addrSpace.isSigned()) { 3264 if (addrSpace.isNegative()) { 3265 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_negative) 3266 << ASArgExpr->getSourceRange(); 3267 Attr.setInvalid(); 3268 return; 3269 } 3270 addrSpace.setIsSigned(false); 3271 } 3272 llvm::APSInt max(addrSpace.getBitWidth()); 3273 max = Qualifiers::MaxAddressSpace; 3274 if (addrSpace > max) { 3275 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_too_high) 3276 << Qualifiers::MaxAddressSpace << ASArgExpr->getSourceRange(); 3277 Attr.setInvalid(); 3278 return; 3279 } 3280 3281 unsigned ASIdx = static_cast<unsigned>(addrSpace.getZExtValue()); 3282 Type = S.Context.getAddrSpaceQualType(Type, ASIdx); 3283} 3284 3285/// handleObjCOwnershipTypeAttr - Process an objc_ownership 3286/// attribute on the specified type. 3287/// 3288/// Returns 'true' if the attribute was handled. 3289static bool handleObjCOwnershipTypeAttr(TypeProcessingState &state, 3290 AttributeList &attr, 3291 QualType &type) { 3292 bool NonObjCPointer = false; 3293 3294 if (!type->isDependentType()) { 3295 if (const PointerType *ptr = type->getAs<PointerType>()) { 3296 QualType pointee = ptr->getPointeeType(); 3297 if (pointee->isObjCRetainableType() || pointee->isPointerType()) 3298 return false; 3299 // It is important not to lose the source info that there was an attribute 3300 // applied to non-objc pointer. We will create an attributed type but 3301 // its type will be the same as the original type. 3302 NonObjCPointer = true; 3303 } else if (!type->isObjCRetainableType()) { 3304 return false; 3305 } 3306 } 3307 3308 Sema &S = state.getSema(); 3309 SourceLocation AttrLoc = attr.getLoc(); 3310 if (AttrLoc.isMacroID()) 3311 AttrLoc = S.getSourceManager().getImmediateExpansionRange(AttrLoc).first; 3312 3313 if (type.getQualifiers().getObjCLifetime()) { 3314 S.Diag(AttrLoc, diag::err_attr_objc_ownership_redundant) 3315 << type; 3316 return true; 3317 } 3318 3319 if (!attr.getParameterName()) { 3320 S.Diag(AttrLoc, diag::err_attribute_argument_n_not_string) 3321 << "objc_ownership" << 1; 3322 attr.setInvalid(); 3323 return true; 3324 } 3325 3326 Qualifiers::ObjCLifetime lifetime; 3327 if (attr.getParameterName()->isStr("none")) 3328 lifetime = Qualifiers::OCL_ExplicitNone; 3329 else if (attr.getParameterName()->isStr("strong")) 3330 lifetime = Qualifiers::OCL_Strong; 3331 else if (attr.getParameterName()->isStr("weak")) 3332 lifetime = Qualifiers::OCL_Weak; 3333 else if (attr.getParameterName()->isStr("autoreleasing")) 3334 lifetime = Qualifiers::OCL_Autoreleasing; 3335 else { 3336 S.Diag(AttrLoc, diag::warn_attribute_type_not_supported) 3337 << "objc_ownership" << attr.getParameterName(); 3338 attr.setInvalid(); 3339 return true; 3340 } 3341 3342 // Consume lifetime attributes without further comment outside of 3343 // ARC mode. 3344 if (!S.getLangOptions().ObjCAutoRefCount) 3345 return true; 3346 3347 if (NonObjCPointer) { 3348 StringRef name = attr.getName()->getName(); 3349 switch (lifetime) { 3350 case Qualifiers::OCL_None: 3351 case Qualifiers::OCL_ExplicitNone: 3352 break; 3353 case Qualifiers::OCL_Strong: name = "__strong"; break; 3354 case Qualifiers::OCL_Weak: name = "__weak"; break; 3355 case Qualifiers::OCL_Autoreleasing: name = "__autoreleasing"; break; 3356 } 3357 S.Diag(AttrLoc, diag::warn_objc_object_attribute_wrong_type) 3358 << name << type; 3359 } 3360 3361 Qualifiers qs; 3362 qs.setObjCLifetime(lifetime); 3363 QualType origType = type; 3364 if (!NonObjCPointer) 3365 type = S.Context.getQualifiedType(type, qs); 3366 3367 // If we have a valid source location for the attribute, use an 3368 // AttributedType instead. 3369 if (AttrLoc.isValid()) 3370 type = S.Context.getAttributedType(AttributedType::attr_objc_ownership, 3371 origType, type); 3372 3373 // Forbid __weak if the runtime doesn't support it. 3374 if (lifetime == Qualifiers::OCL_Weak && 3375 !S.getLangOptions().ObjCRuntimeHasWeak && !NonObjCPointer) { 3376 3377 // Actually, delay this until we know what we're parsing. 3378 if (S.DelayedDiagnostics.shouldDelayDiagnostics()) { 3379 S.DelayedDiagnostics.add( 3380 sema::DelayedDiagnostic::makeForbiddenType( 3381 S.getSourceManager().getExpansionLoc(AttrLoc), 3382 diag::err_arc_weak_no_runtime, type, /*ignored*/ 0)); 3383 } else { 3384 S.Diag(AttrLoc, diag::err_arc_weak_no_runtime); 3385 } 3386 3387 attr.setInvalid(); 3388 return true; 3389 } 3390 3391 // Forbid __weak for class objects marked as 3392 // objc_arc_weak_reference_unavailable 3393 if (lifetime == Qualifiers::OCL_Weak) { 3394 QualType T = type; 3395 while (const PointerType *ptr = T->getAs<PointerType>()) 3396 T = ptr->getPointeeType(); 3397 if (const ObjCObjectPointerType *ObjT = T->getAs<ObjCObjectPointerType>()) { 3398 ObjCInterfaceDecl *Class = ObjT->getInterfaceDecl(); 3399 if (Class->isArcWeakrefUnavailable()) { 3400 S.Diag(AttrLoc, diag::err_arc_unsupported_weak_class); 3401 S.Diag(ObjT->getInterfaceDecl()->getLocation(), 3402 diag::note_class_declared); 3403 } 3404 } 3405 } 3406 3407 return true; 3408} 3409 3410/// handleObjCGCTypeAttr - Process the __attribute__((objc_gc)) type 3411/// attribute on the specified type. Returns true to indicate that 3412/// the attribute was handled, false to indicate that the type does 3413/// not permit the attribute. 3414static bool handleObjCGCTypeAttr(TypeProcessingState &state, 3415 AttributeList &attr, 3416 QualType &type) { 3417 Sema &S = state.getSema(); 3418 3419 // Delay if this isn't some kind of pointer. 3420 if (!type->isPointerType() && 3421 !type->isObjCObjectPointerType() && 3422 !type->isBlockPointerType()) 3423 return false; 3424 3425 if (type.getObjCGCAttr() != Qualifiers::GCNone) { 3426 S.Diag(attr.getLoc(), diag::err_attribute_multiple_objc_gc); 3427 attr.setInvalid(); 3428 return true; 3429 } 3430 3431 // Check the attribute arguments. 3432 if (!attr.getParameterName()) { 3433 S.Diag(attr.getLoc(), diag::err_attribute_argument_n_not_string) 3434 << "objc_gc" << 1; 3435 attr.setInvalid(); 3436 return true; 3437 } 3438 Qualifiers::GC GCAttr; 3439 if (attr.getNumArgs() != 0) { 3440 S.Diag(attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 3441 attr.setInvalid(); 3442 return true; 3443 } 3444 if (attr.getParameterName()->isStr("weak")) 3445 GCAttr = Qualifiers::Weak; 3446 else if (attr.getParameterName()->isStr("strong")) 3447 GCAttr = Qualifiers::Strong; 3448 else { 3449 S.Diag(attr.getLoc(), diag::warn_attribute_type_not_supported) 3450 << "objc_gc" << attr.getParameterName(); 3451 attr.setInvalid(); 3452 return true; 3453 } 3454 3455 QualType origType = type; 3456 type = S.Context.getObjCGCQualType(origType, GCAttr); 3457 3458 // Make an attributed type to preserve the source information. 3459 if (attr.getLoc().isValid()) 3460 type = S.Context.getAttributedType(AttributedType::attr_objc_gc, 3461 origType, type); 3462 3463 return true; 3464} 3465 3466namespace { 3467 /// A helper class to unwrap a type down to a function for the 3468 /// purposes of applying attributes there. 3469 /// 3470 /// Use: 3471 /// FunctionTypeUnwrapper unwrapped(SemaRef, T); 3472 /// if (unwrapped.isFunctionType()) { 3473 /// const FunctionType *fn = unwrapped.get(); 3474 /// // change fn somehow 3475 /// T = unwrapped.wrap(fn); 3476 /// } 3477 struct FunctionTypeUnwrapper { 3478 enum WrapKind { 3479 Desugar, 3480 Parens, 3481 Pointer, 3482 BlockPointer, 3483 Reference, 3484 MemberPointer 3485 }; 3486 3487 QualType Original; 3488 const FunctionType *Fn; 3489 SmallVector<unsigned char /*WrapKind*/, 8> Stack; 3490 3491 FunctionTypeUnwrapper(Sema &S, QualType T) : Original(T) { 3492 while (true) { 3493 const Type *Ty = T.getTypePtr(); 3494 if (isa<FunctionType>(Ty)) { 3495 Fn = cast<FunctionType>(Ty); 3496 return; 3497 } else if (isa<ParenType>(Ty)) { 3498 T = cast<ParenType>(Ty)->getInnerType(); 3499 Stack.push_back(Parens); 3500 } else if (isa<PointerType>(Ty)) { 3501 T = cast<PointerType>(Ty)->getPointeeType(); 3502 Stack.push_back(Pointer); 3503 } else if (isa<BlockPointerType>(Ty)) { 3504 T = cast<BlockPointerType>(Ty)->getPointeeType(); 3505 Stack.push_back(BlockPointer); 3506 } else if (isa<MemberPointerType>(Ty)) { 3507 T = cast<MemberPointerType>(Ty)->getPointeeType(); 3508 Stack.push_back(MemberPointer); 3509 } else if (isa<ReferenceType>(Ty)) { 3510 T = cast<ReferenceType>(Ty)->getPointeeType(); 3511 Stack.push_back(Reference); 3512 } else { 3513 const Type *DTy = Ty->getUnqualifiedDesugaredType(); 3514 if (Ty == DTy) { 3515 Fn = 0; 3516 return; 3517 } 3518 3519 T = QualType(DTy, 0); 3520 Stack.push_back(Desugar); 3521 } 3522 } 3523 } 3524 3525 bool isFunctionType() const { return (Fn != 0); } 3526 const FunctionType *get() const { return Fn; } 3527 3528 QualType wrap(Sema &S, const FunctionType *New) { 3529 // If T wasn't modified from the unwrapped type, do nothing. 3530 if (New == get()) return Original; 3531 3532 Fn = New; 3533 return wrap(S.Context, Original, 0); 3534 } 3535 3536 private: 3537 QualType wrap(ASTContext &C, QualType Old, unsigned I) { 3538 if (I == Stack.size()) 3539 return C.getQualifiedType(Fn, Old.getQualifiers()); 3540 3541 // Build up the inner type, applying the qualifiers from the old 3542 // type to the new type. 3543 SplitQualType SplitOld = Old.split(); 3544 3545 // As a special case, tail-recurse if there are no qualifiers. 3546 if (SplitOld.second.empty()) 3547 return wrap(C, SplitOld.first, I); 3548 return C.getQualifiedType(wrap(C, SplitOld.first, I), SplitOld.second); 3549 } 3550 3551 QualType wrap(ASTContext &C, const Type *Old, unsigned I) { 3552 if (I == Stack.size()) return QualType(Fn, 0); 3553 3554 switch (static_cast<WrapKind>(Stack[I++])) { 3555 case Desugar: 3556 // This is the point at which we potentially lose source 3557 // information. 3558 return wrap(C, Old->getUnqualifiedDesugaredType(), I); 3559 3560 case Parens: { 3561 QualType New = wrap(C, cast<ParenType>(Old)->getInnerType(), I); 3562 return C.getParenType(New); 3563 } 3564 3565 case Pointer: { 3566 QualType New = wrap(C, cast<PointerType>(Old)->getPointeeType(), I); 3567 return C.getPointerType(New); 3568 } 3569 3570 case BlockPointer: { 3571 QualType New = wrap(C, cast<BlockPointerType>(Old)->getPointeeType(),I); 3572 return C.getBlockPointerType(New); 3573 } 3574 3575 case MemberPointer: { 3576 const MemberPointerType *OldMPT = cast<MemberPointerType>(Old); 3577 QualType New = wrap(C, OldMPT->getPointeeType(), I); 3578 return C.getMemberPointerType(New, OldMPT->getClass()); 3579 } 3580 3581 case Reference: { 3582 const ReferenceType *OldRef = cast<ReferenceType>(Old); 3583 QualType New = wrap(C, OldRef->getPointeeType(), I); 3584 if (isa<LValueReferenceType>(OldRef)) 3585 return C.getLValueReferenceType(New, OldRef->isSpelledAsLValue()); 3586 else 3587 return C.getRValueReferenceType(New); 3588 } 3589 } 3590 3591 llvm_unreachable("unknown wrapping kind"); 3592 return QualType(); 3593 } 3594 }; 3595} 3596 3597/// Process an individual function attribute. Returns true to 3598/// indicate that the attribute was handled, false if it wasn't. 3599static bool handleFunctionTypeAttr(TypeProcessingState &state, 3600 AttributeList &attr, 3601 QualType &type) { 3602 Sema &S = state.getSema(); 3603 3604 FunctionTypeUnwrapper unwrapped(S, type); 3605 3606 if (attr.getKind() == AttributeList::AT_noreturn) { 3607 if (S.CheckNoReturnAttr(attr)) 3608 return true; 3609 3610 // Delay if this is not a function type. 3611 if (!unwrapped.isFunctionType()) 3612 return false; 3613 3614 // Otherwise we can process right away. 3615 FunctionType::ExtInfo EI = unwrapped.get()->getExtInfo().withNoReturn(true); 3616 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 3617 return true; 3618 } 3619 3620 // ns_returns_retained is not always a type attribute, but if we got 3621 // here, we're treating it as one right now. 3622 if (attr.getKind() == AttributeList::AT_ns_returns_retained) { 3623 assert(S.getLangOptions().ObjCAutoRefCount && 3624 "ns_returns_retained treated as type attribute in non-ARC"); 3625 if (attr.getNumArgs()) return true; 3626 3627 // Delay if this is not a function type. 3628 if (!unwrapped.isFunctionType()) 3629 return false; 3630 3631 FunctionType::ExtInfo EI 3632 = unwrapped.get()->getExtInfo().withProducesResult(true); 3633 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 3634 return true; 3635 } 3636 3637 if (attr.getKind() == AttributeList::AT_regparm) { 3638 unsigned value; 3639 if (S.CheckRegparmAttr(attr, value)) 3640 return true; 3641 3642 // Delay if this is not a function type. 3643 if (!unwrapped.isFunctionType()) 3644 return false; 3645 3646 // Diagnose regparm with fastcall. 3647 const FunctionType *fn = unwrapped.get(); 3648 CallingConv CC = fn->getCallConv(); 3649 if (CC == CC_X86FastCall) { 3650 S.Diag(attr.getLoc(), diag::err_attributes_are_not_compatible) 3651 << FunctionType::getNameForCallConv(CC) 3652 << "regparm"; 3653 attr.setInvalid(); 3654 return true; 3655 } 3656 3657 FunctionType::ExtInfo EI = 3658 unwrapped.get()->getExtInfo().withRegParm(value); 3659 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 3660 return true; 3661 } 3662 3663 // Otherwise, a calling convention. 3664 CallingConv CC; 3665 if (S.CheckCallingConvAttr(attr, CC)) 3666 return true; 3667 3668 // Delay if the type didn't work out to a function. 3669 if (!unwrapped.isFunctionType()) return false; 3670 3671 const FunctionType *fn = unwrapped.get(); 3672 CallingConv CCOld = fn->getCallConv(); 3673 if (S.Context.getCanonicalCallConv(CC) == 3674 S.Context.getCanonicalCallConv(CCOld)) { 3675 FunctionType::ExtInfo EI= unwrapped.get()->getExtInfo().withCallingConv(CC); 3676 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 3677 return true; 3678 } 3679 3680 if (CCOld != (S.LangOpts.MRTD ? CC_X86StdCall : CC_Default)) { 3681 // Should we diagnose reapplications of the same convention? 3682 S.Diag(attr.getLoc(), diag::err_attributes_are_not_compatible) 3683 << FunctionType::getNameForCallConv(CC) 3684 << FunctionType::getNameForCallConv(CCOld); 3685 attr.setInvalid(); 3686 return true; 3687 } 3688 3689 // Diagnose the use of X86 fastcall on varargs or unprototyped functions. 3690 if (CC == CC_X86FastCall) { 3691 if (isa<FunctionNoProtoType>(fn)) { 3692 S.Diag(attr.getLoc(), diag::err_cconv_knr) 3693 << FunctionType::getNameForCallConv(CC); 3694 attr.setInvalid(); 3695 return true; 3696 } 3697 3698 const FunctionProtoType *FnP = cast<FunctionProtoType>(fn); 3699 if (FnP->isVariadic()) { 3700 S.Diag(attr.getLoc(), diag::err_cconv_varargs) 3701 << FunctionType::getNameForCallConv(CC); 3702 attr.setInvalid(); 3703 return true; 3704 } 3705 3706 // Also diagnose fastcall with regparm. 3707 if (fn->getHasRegParm()) { 3708 S.Diag(attr.getLoc(), diag::err_attributes_are_not_compatible) 3709 << "regparm" 3710 << FunctionType::getNameForCallConv(CC); 3711 attr.setInvalid(); 3712 return true; 3713 } 3714 } 3715 3716 FunctionType::ExtInfo EI = unwrapped.get()->getExtInfo().withCallingConv(CC); 3717 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 3718 return true; 3719} 3720 3721/// Handle OpenCL image access qualifiers: read_only, write_only, read_write 3722static void HandleOpenCLImageAccessAttribute(QualType& CurType, 3723 const AttributeList &Attr, 3724 Sema &S) { 3725 // Check the attribute arguments. 3726 if (Attr.getNumArgs() != 1) { 3727 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 3728 Attr.setInvalid(); 3729 return; 3730 } 3731 Expr *sizeExpr = static_cast<Expr *>(Attr.getArg(0)); 3732 llvm::APSInt arg(32); 3733 if (sizeExpr->isTypeDependent() || sizeExpr->isValueDependent() || 3734 !sizeExpr->isIntegerConstantExpr(arg, S.Context)) { 3735 S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int) 3736 << "opencl_image_access" << sizeExpr->getSourceRange(); 3737 Attr.setInvalid(); 3738 return; 3739 } 3740 unsigned iarg = static_cast<unsigned>(arg.getZExtValue()); 3741 switch (iarg) { 3742 case CLIA_read_only: 3743 case CLIA_write_only: 3744 case CLIA_read_write: 3745 // Implemented in a separate patch 3746 break; 3747 default: 3748 // Implemented in a separate patch 3749 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_size) 3750 << sizeExpr->getSourceRange(); 3751 Attr.setInvalid(); 3752 break; 3753 } 3754} 3755 3756/// HandleVectorSizeAttribute - this attribute is only applicable to integral 3757/// and float scalars, although arrays, pointers, and function return values are 3758/// allowed in conjunction with this construct. Aggregates with this attribute 3759/// are invalid, even if they are of the same size as a corresponding scalar. 3760/// The raw attribute should contain precisely 1 argument, the vector size for 3761/// the variable, measured in bytes. If curType and rawAttr are well formed, 3762/// this routine will return a new vector type. 3763static void HandleVectorSizeAttr(QualType& CurType, const AttributeList &Attr, 3764 Sema &S) { 3765 // Check the attribute arguments. 3766 if (Attr.getNumArgs() != 1) { 3767 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 3768 Attr.setInvalid(); 3769 return; 3770 } 3771 Expr *sizeExpr = static_cast<Expr *>(Attr.getArg(0)); 3772 llvm::APSInt vecSize(32); 3773 if (sizeExpr->isTypeDependent() || sizeExpr->isValueDependent() || 3774 !sizeExpr->isIntegerConstantExpr(vecSize, S.Context)) { 3775 S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int) 3776 << "vector_size" << sizeExpr->getSourceRange(); 3777 Attr.setInvalid(); 3778 return; 3779 } 3780 // the base type must be integer or float, and can't already be a vector. 3781 if (!CurType->isIntegerType() && !CurType->isRealFloatingType()) { 3782 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_vector_type) << CurType; 3783 Attr.setInvalid(); 3784 return; 3785 } 3786 unsigned typeSize = static_cast<unsigned>(S.Context.getTypeSize(CurType)); 3787 // vecSize is specified in bytes - convert to bits. 3788 unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue() * 8); 3789 3790 // the vector size needs to be an integral multiple of the type size. 3791 if (vectorSize % typeSize) { 3792 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_size) 3793 << sizeExpr->getSourceRange(); 3794 Attr.setInvalid(); 3795 return; 3796 } 3797 if (vectorSize == 0) { 3798 S.Diag(Attr.getLoc(), diag::err_attribute_zero_size) 3799 << sizeExpr->getSourceRange(); 3800 Attr.setInvalid(); 3801 return; 3802 } 3803 3804 // Success! Instantiate the vector type, the number of elements is > 0, and 3805 // not required to be a power of 2, unlike GCC. 3806 CurType = S.Context.getVectorType(CurType, vectorSize/typeSize, 3807 VectorType::GenericVector); 3808} 3809 3810/// \brief Process the OpenCL-like ext_vector_type attribute when it occurs on 3811/// a type. 3812static void HandleExtVectorTypeAttr(QualType &CurType, 3813 const AttributeList &Attr, 3814 Sema &S) { 3815 Expr *sizeExpr; 3816 3817 // Special case where the argument is a template id. 3818 if (Attr.getParameterName()) { 3819 CXXScopeSpec SS; 3820 UnqualifiedId id; 3821 id.setIdentifier(Attr.getParameterName(), Attr.getLoc()); 3822 3823 ExprResult Size = S.ActOnIdExpression(S.getCurScope(), SS, id, false, 3824 false); 3825 if (Size.isInvalid()) 3826 return; 3827 3828 sizeExpr = Size.get(); 3829 } else { 3830 // check the attribute arguments. 3831 if (Attr.getNumArgs() != 1) { 3832 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 3833 return; 3834 } 3835 sizeExpr = Attr.getArg(0); 3836 } 3837 3838 // Create the vector type. 3839 QualType T = S.BuildExtVectorType(CurType, sizeExpr, Attr.getLoc()); 3840 if (!T.isNull()) 3841 CurType = T; 3842} 3843 3844/// HandleNeonVectorTypeAttr - The "neon_vector_type" and 3845/// "neon_polyvector_type" attributes are used to create vector types that 3846/// are mangled according to ARM's ABI. Otherwise, these types are identical 3847/// to those created with the "vector_size" attribute. Unlike "vector_size" 3848/// the argument to these Neon attributes is the number of vector elements, 3849/// not the vector size in bytes. The vector width and element type must 3850/// match one of the standard Neon vector types. 3851static void HandleNeonVectorTypeAttr(QualType& CurType, 3852 const AttributeList &Attr, Sema &S, 3853 VectorType::VectorKind VecKind, 3854 const char *AttrName) { 3855 // Check the attribute arguments. 3856 if (Attr.getNumArgs() != 1) { 3857 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 3858 Attr.setInvalid(); 3859 return; 3860 } 3861 // The number of elements must be an ICE. 3862 Expr *numEltsExpr = static_cast<Expr *>(Attr.getArg(0)); 3863 llvm::APSInt numEltsInt(32); 3864 if (numEltsExpr->isTypeDependent() || numEltsExpr->isValueDependent() || 3865 !numEltsExpr->isIntegerConstantExpr(numEltsInt, S.Context)) { 3866 S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int) 3867 << AttrName << numEltsExpr->getSourceRange(); 3868 Attr.setInvalid(); 3869 return; 3870 } 3871 // Only certain element types are supported for Neon vectors. 3872 const BuiltinType* BTy = CurType->getAs<BuiltinType>(); 3873 if (!BTy || 3874 (VecKind == VectorType::NeonPolyVector && 3875 BTy->getKind() != BuiltinType::SChar && 3876 BTy->getKind() != BuiltinType::Short) || 3877 (BTy->getKind() != BuiltinType::SChar && 3878 BTy->getKind() != BuiltinType::UChar && 3879 BTy->getKind() != BuiltinType::Short && 3880 BTy->getKind() != BuiltinType::UShort && 3881 BTy->getKind() != BuiltinType::Int && 3882 BTy->getKind() != BuiltinType::UInt && 3883 BTy->getKind() != BuiltinType::LongLong && 3884 BTy->getKind() != BuiltinType::ULongLong && 3885 BTy->getKind() != BuiltinType::Float)) { 3886 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_vector_type) <<CurType; 3887 Attr.setInvalid(); 3888 return; 3889 } 3890 // The total size of the vector must be 64 or 128 bits. 3891 unsigned typeSize = static_cast<unsigned>(S.Context.getTypeSize(CurType)); 3892 unsigned numElts = static_cast<unsigned>(numEltsInt.getZExtValue()); 3893 unsigned vecSize = typeSize * numElts; 3894 if (vecSize != 64 && vecSize != 128) { 3895 S.Diag(Attr.getLoc(), diag::err_attribute_bad_neon_vector_size) << CurType; 3896 Attr.setInvalid(); 3897 return; 3898 } 3899 3900 CurType = S.Context.getVectorType(CurType, numElts, VecKind); 3901} 3902 3903static void processTypeAttrs(TypeProcessingState &state, QualType &type, 3904 bool isDeclSpec, AttributeList *attrs) { 3905 // Scan through and apply attributes to this type where it makes sense. Some 3906 // attributes (such as __address_space__, __vector_size__, etc) apply to the 3907 // type, but others can be present in the type specifiers even though they 3908 // apply to the decl. Here we apply type attributes and ignore the rest. 3909 3910 AttributeList *next; 3911 do { 3912 AttributeList &attr = *attrs; 3913 next = attr.getNext(); 3914 3915 // Skip attributes that were marked to be invalid. 3916 if (attr.isInvalid()) 3917 continue; 3918 3919 // If this is an attribute we can handle, do so now, 3920 // otherwise, add it to the FnAttrs list for rechaining. 3921 switch (attr.getKind()) { 3922 default: break; 3923 3924 case AttributeList::AT_may_alias: 3925 // FIXME: This attribute needs to actually be handled, but if we ignore 3926 // it it breaks large amounts of Linux software. 3927 attr.setUsedAsTypeAttr(); 3928 break; 3929 case AttributeList::AT_address_space: 3930 HandleAddressSpaceTypeAttribute(type, attr, state.getSema()); 3931 attr.setUsedAsTypeAttr(); 3932 break; 3933 OBJC_POINTER_TYPE_ATTRS_CASELIST: 3934 if (!handleObjCPointerTypeAttr(state, attr, type)) 3935 distributeObjCPointerTypeAttr(state, attr, type); 3936 attr.setUsedAsTypeAttr(); 3937 break; 3938 case AttributeList::AT_vector_size: 3939 HandleVectorSizeAttr(type, attr, state.getSema()); 3940 attr.setUsedAsTypeAttr(); 3941 break; 3942 case AttributeList::AT_ext_vector_type: 3943 if (state.getDeclarator().getDeclSpec().getStorageClassSpec() 3944 != DeclSpec::SCS_typedef) 3945 HandleExtVectorTypeAttr(type, attr, state.getSema()); 3946 attr.setUsedAsTypeAttr(); 3947 break; 3948 case AttributeList::AT_neon_vector_type: 3949 HandleNeonVectorTypeAttr(type, attr, state.getSema(), 3950 VectorType::NeonVector, "neon_vector_type"); 3951 attr.setUsedAsTypeAttr(); 3952 break; 3953 case AttributeList::AT_neon_polyvector_type: 3954 HandleNeonVectorTypeAttr(type, attr, state.getSema(), 3955 VectorType::NeonPolyVector, 3956 "neon_polyvector_type"); 3957 attr.setUsedAsTypeAttr(); 3958 break; 3959 case AttributeList::AT_opencl_image_access: 3960 HandleOpenCLImageAccessAttribute(type, attr, state.getSema()); 3961 attr.setUsedAsTypeAttr(); 3962 break; 3963 3964 case AttributeList::AT_ns_returns_retained: 3965 if (!state.getSema().getLangOptions().ObjCAutoRefCount) 3966 break; 3967 // fallthrough into the function attrs 3968 3969 FUNCTION_TYPE_ATTRS_CASELIST: 3970 attr.setUsedAsTypeAttr(); 3971 3972 // Never process function type attributes as part of the 3973 // declaration-specifiers. 3974 if (isDeclSpec) 3975 distributeFunctionTypeAttrFromDeclSpec(state, attr, type); 3976 3977 // Otherwise, handle the possible delays. 3978 else if (!handleFunctionTypeAttr(state, attr, type)) 3979 distributeFunctionTypeAttr(state, attr, type); 3980 break; 3981 } 3982 } while ((attrs = next)); 3983} 3984 3985/// \brief Ensure that the type of the given expression is complete. 3986/// 3987/// This routine checks whether the expression \p E has a complete type. If the 3988/// expression refers to an instantiable construct, that instantiation is 3989/// performed as needed to complete its type. Furthermore 3990/// Sema::RequireCompleteType is called for the expression's type (or in the 3991/// case of a reference type, the referred-to type). 3992/// 3993/// \param E The expression whose type is required to be complete. 3994/// \param PD The partial diagnostic that will be printed out if the type cannot 3995/// be completed. 3996/// 3997/// \returns \c true if the type of \p E is incomplete and diagnosed, \c false 3998/// otherwise. 3999bool Sema::RequireCompleteExprType(Expr *E, const PartialDiagnostic &PD, 4000 std::pair<SourceLocation, 4001 PartialDiagnostic> Note) { 4002 QualType T = E->getType(); 4003 4004 // Fast path the case where the type is already complete. 4005 if (!T->isIncompleteType()) 4006 return false; 4007 4008 // Incomplete array types may be completed by the initializer attached to 4009 // their definitions. For static data members of class templates we need to 4010 // instantiate the definition to get this initializer and complete the type. 4011 if (T->isIncompleteArrayType()) { 4012 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E->IgnoreParens())) { 4013 if (VarDecl *Var = dyn_cast<VarDecl>(DRE->getDecl())) { 4014 if (Var->isStaticDataMember() && 4015 Var->getInstantiatedFromStaticDataMember()) { 4016 4017 MemberSpecializationInfo *MSInfo = Var->getMemberSpecializationInfo(); 4018 assert(MSInfo && "Missing member specialization information?"); 4019 if (MSInfo->getTemplateSpecializationKind() 4020 != TSK_ExplicitSpecialization) { 4021 // If we don't already have a point of instantiation, this is it. 4022 if (MSInfo->getPointOfInstantiation().isInvalid()) { 4023 MSInfo->setPointOfInstantiation(E->getLocStart()); 4024 4025 // This is a modification of an existing AST node. Notify 4026 // listeners. 4027 if (ASTMutationListener *L = getASTMutationListener()) 4028 L->StaticDataMemberInstantiated(Var); 4029 } 4030 4031 InstantiateStaticDataMemberDefinition(E->getExprLoc(), Var); 4032 4033 // Update the type to the newly instantiated definition's type both 4034 // here and within the expression. 4035 if (VarDecl *Def = Var->getDefinition()) { 4036 DRE->setDecl(Def); 4037 T = Def->getType(); 4038 DRE->setType(T); 4039 E->setType(T); 4040 } 4041 } 4042 4043 // We still go on to try to complete the type independently, as it 4044 // may also require instantiations or diagnostics if it remains 4045 // incomplete. 4046 } 4047 } 4048 } 4049 } 4050 4051 // FIXME: Are there other cases which require instantiating something other 4052 // than the type to complete the type of an expression? 4053 4054 // Look through reference types and complete the referred type. 4055 if (const ReferenceType *Ref = T->getAs<ReferenceType>()) 4056 T = Ref->getPointeeType(); 4057 4058 return RequireCompleteType(E->getExprLoc(), T, PD, Note); 4059} 4060 4061/// @brief Ensure that the type T is a complete type. 4062/// 4063/// This routine checks whether the type @p T is complete in any 4064/// context where a complete type is required. If @p T is a complete 4065/// type, returns false. If @p T is a class template specialization, 4066/// this routine then attempts to perform class template 4067/// instantiation. If instantiation fails, or if @p T is incomplete 4068/// and cannot be completed, issues the diagnostic @p diag (giving it 4069/// the type @p T) and returns true. 4070/// 4071/// @param Loc The location in the source that the incomplete type 4072/// diagnostic should refer to. 4073/// 4074/// @param T The type that this routine is examining for completeness. 4075/// 4076/// @param PD The partial diagnostic that will be printed out if T is not a 4077/// complete type. 4078/// 4079/// @returns @c true if @p T is incomplete and a diagnostic was emitted, 4080/// @c false otherwise. 4081bool Sema::RequireCompleteType(SourceLocation Loc, QualType T, 4082 const PartialDiagnostic &PD, 4083 std::pair<SourceLocation, 4084 PartialDiagnostic> Note) { 4085 unsigned diag = PD.getDiagID(); 4086 4087 // FIXME: Add this assertion to make sure we always get instantiation points. 4088 // assert(!Loc.isInvalid() && "Invalid location in RequireCompleteType"); 4089 // FIXME: Add this assertion to help us flush out problems with 4090 // checking for dependent types and type-dependent expressions. 4091 // 4092 // assert(!T->isDependentType() && 4093 // "Can't ask whether a dependent type is complete"); 4094 4095 // If we have a complete type, we're done. 4096 NamedDecl *Def = 0; 4097 if (!T->isIncompleteType(&Def)) { 4098 // If we know about the definition but it is not visible, complain. 4099 if (diag != 0 && Def && !LookupResult::isVisible(Def)) { 4100 // Suppress this error outside of a SFINAE context if we've already 4101 // emitted the error once for this type. There's no usefulness in 4102 // repeating the diagnostic. 4103 // FIXME: Add a Fix-It that imports the corresponding module or includes 4104 // the header. 4105 if (isSFINAEContext() || HiddenDefinitions.insert(Def)) { 4106 Diag(Loc, diag::err_module_private_definition) << T; 4107 Diag(Def->getLocation(), diag::note_previous_definition); 4108 } 4109 } 4110 4111 return false; 4112 } 4113 4114 const TagType *Tag = T->getAs<TagType>(); 4115 const ObjCInterfaceType *IFace = 0; 4116 4117 if (Tag) { 4118 // Avoid diagnosing invalid decls as incomplete. 4119 if (Tag->getDecl()->isInvalidDecl()) 4120 return true; 4121 4122 // Give the external AST source a chance to complete the type. 4123 if (Tag->getDecl()->hasExternalLexicalStorage()) { 4124 Context.getExternalSource()->CompleteType(Tag->getDecl()); 4125 if (!Tag->isIncompleteType()) 4126 return false; 4127 } 4128 } 4129 else if ((IFace = T->getAs<ObjCInterfaceType>())) { 4130 // Avoid diagnosing invalid decls as incomplete. 4131 if (IFace->getDecl()->isInvalidDecl()) 4132 return true; 4133 4134 // Give the external AST source a chance to complete the type. 4135 if (IFace->getDecl()->hasExternalLexicalStorage()) { 4136 Context.getExternalSource()->CompleteType(IFace->getDecl()); 4137 if (!IFace->isIncompleteType()) 4138 return false; 4139 } 4140 } 4141 4142 // If we have a class template specialization or a class member of a 4143 // class template specialization, or an array with known size of such, 4144 // try to instantiate it. 4145 QualType MaybeTemplate = T; 4146 if (const ConstantArrayType *Array = Context.getAsConstantArrayType(T)) 4147 MaybeTemplate = Array->getElementType(); 4148 if (const RecordType *Record = MaybeTemplate->getAs<RecordType>()) { 4149 if (ClassTemplateSpecializationDecl *ClassTemplateSpec 4150 = dyn_cast<ClassTemplateSpecializationDecl>(Record->getDecl())) { 4151 if (ClassTemplateSpec->getSpecializationKind() == TSK_Undeclared) 4152 return InstantiateClassTemplateSpecialization(Loc, ClassTemplateSpec, 4153 TSK_ImplicitInstantiation, 4154 /*Complain=*/diag != 0); 4155 } else if (CXXRecordDecl *Rec 4156 = dyn_cast<CXXRecordDecl>(Record->getDecl())) { 4157 if (CXXRecordDecl *Pattern = Rec->getInstantiatedFromMemberClass()) { 4158 MemberSpecializationInfo *MSInfo = Rec->getMemberSpecializationInfo(); 4159 assert(MSInfo && "Missing member specialization information?"); 4160 // This record was instantiated from a class within a template. 4161 if (MSInfo->getTemplateSpecializationKind() 4162 != TSK_ExplicitSpecialization) 4163 return InstantiateClass(Loc, Rec, Pattern, 4164 getTemplateInstantiationArgs(Rec), 4165 TSK_ImplicitInstantiation, 4166 /*Complain=*/diag != 0); 4167 } 4168 } 4169 } 4170 4171 if (diag == 0) 4172 return true; 4173 4174 // We have an incomplete type. Produce a diagnostic. 4175 Diag(Loc, PD) << T; 4176 4177 // If we have a note, produce it. 4178 if (!Note.first.isInvalid()) 4179 Diag(Note.first, Note.second); 4180 4181 // If the type was a forward declaration of a class/struct/union 4182 // type, produce a note. 4183 if (Tag && !Tag->getDecl()->isInvalidDecl()) 4184 Diag(Tag->getDecl()->getLocation(), 4185 Tag->isBeingDefined() ? diag::note_type_being_defined 4186 : diag::note_forward_declaration) 4187 << QualType(Tag, 0); 4188 4189 // If the Objective-C class was a forward declaration, produce a note. 4190 if (IFace && !IFace->getDecl()->isInvalidDecl()) 4191 Diag(IFace->getDecl()->getLocation(), diag::note_forward_class); 4192 4193 return true; 4194} 4195 4196bool Sema::RequireCompleteType(SourceLocation Loc, QualType T, 4197 const PartialDiagnostic &PD) { 4198 return RequireCompleteType(Loc, T, PD, 4199 std::make_pair(SourceLocation(), PDiag(0))); 4200} 4201 4202bool Sema::RequireCompleteType(SourceLocation Loc, QualType T, 4203 unsigned DiagID) { 4204 return RequireCompleteType(Loc, T, PDiag(DiagID), 4205 std::make_pair(SourceLocation(), PDiag(0))); 4206} 4207 4208/// @brief Ensure that the type T is a literal type. 4209/// 4210/// This routine checks whether the type @p T is a literal type. If @p T is an 4211/// incomplete type, an attempt is made to complete it. If @p T is a literal 4212/// type, or @p AllowIncompleteType is true and @p T is an incomplete type, 4213/// returns false. Otherwise, this routine issues the diagnostic @p PD (giving 4214/// it the type @p T), along with notes explaining why the type is not a 4215/// literal type, and returns true. 4216/// 4217/// @param Loc The location in the source that the non-literal type 4218/// diagnostic should refer to. 4219/// 4220/// @param T The type that this routine is examining for literalness. 4221/// 4222/// @param PD The partial diagnostic that will be printed out if T is not a 4223/// literal type. 4224/// 4225/// @param AllowIncompleteType If true, an incomplete type will be considered 4226/// acceptable. 4227/// 4228/// @returns @c true if @p T is not a literal type and a diagnostic was emitted, 4229/// @c false otherwise. 4230bool Sema::RequireLiteralType(SourceLocation Loc, QualType T, 4231 const PartialDiagnostic &PD, 4232 bool AllowIncompleteType) { 4233 assert(!T->isDependentType() && "type should not be dependent"); 4234 4235 bool Incomplete = RequireCompleteType(Loc, T, 0); 4236 if (T->isLiteralType() || (AllowIncompleteType && Incomplete)) 4237 return false; 4238 4239 if (PD.getDiagID() == 0) 4240 return true; 4241 4242 Diag(Loc, PD) << T; 4243 4244 if (T->isVariableArrayType()) 4245 return true; 4246 4247 const RecordType *RT = T->getBaseElementTypeUnsafe()->getAs<RecordType>(); 4248 if (!RT) 4249 return true; 4250 4251 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 4252 4253 // If the class has virtual base classes, then it's not an aggregate, and 4254 // cannot have any constexpr constructors, so is non-literal. This is better 4255 // to diagnose than the resulting absence of constexpr constructors. 4256 if (RD->getNumVBases()) { 4257 Diag(RD->getLocation(), diag::note_non_literal_virtual_base) 4258 << RD->isStruct() << RD->getNumVBases(); 4259 for (CXXRecordDecl::base_class_const_iterator I = RD->vbases_begin(), 4260 E = RD->vbases_end(); I != E; ++I) 4261 Diag(I->getSourceRange().getBegin(), 4262 diag::note_constexpr_virtual_base_here) << I->getSourceRange(); 4263 } else if (!RD->isAggregate() && !RD->hasConstexprNonCopyMoveConstructor()) { 4264 Diag(RD->getLocation(), diag::note_non_literal_no_constexpr_ctors) << RD; 4265 4266 switch (RD->getTemplateSpecializationKind()) { 4267 case TSK_Undeclared: 4268 case TSK_ExplicitSpecialization: 4269 break; 4270 4271 case TSK_ImplicitInstantiation: 4272 case TSK_ExplicitInstantiationDeclaration: 4273 case TSK_ExplicitInstantiationDefinition: 4274 // If the base template had constexpr constructors which were 4275 // instantiated as non-constexpr constructors, explain why. 4276 for (CXXRecordDecl::ctor_iterator I = RD->ctor_begin(), 4277 E = RD->ctor_end(); I != E; ++I) { 4278 if ((*I)->isCopyConstructor() || (*I)->isMoveConstructor()) 4279 continue; 4280 4281 FunctionDecl *Base = (*I)->getInstantiatedFromMemberFunction(); 4282 if (Base && Base->isConstexpr()) 4283 CheckConstexprFunctionDecl(*I, CCK_NoteNonConstexprInstantiation); 4284 } 4285 } 4286 } else if (RD->hasNonLiteralTypeFieldsOrBases()) { 4287 for (CXXRecordDecl::base_class_const_iterator I = RD->bases_begin(), 4288 E = RD->bases_end(); I != E; ++I) { 4289 if (!I->getType()->isLiteralType()) { 4290 Diag(I->getSourceRange().getBegin(), 4291 diag::note_non_literal_base_class) 4292 << RD << I->getType() << I->getSourceRange(); 4293 return true; 4294 } 4295 } 4296 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 4297 E = RD->field_end(); I != E; ++I) { 4298 if (!(*I)->getType()->isLiteralType()) { 4299 Diag((*I)->getLocation(), diag::note_non_literal_field) 4300 << RD << (*I) << (*I)->getType(); 4301 return true; 4302 } else if ((*I)->isMutable()) { 4303 Diag((*I)->getLocation(), diag::note_non_literal_mutable_field) << RD; 4304 return true; 4305 } 4306 } 4307 } else if (!RD->hasTrivialDestructor()) { 4308 // All fields and bases are of literal types, so have trivial destructors. 4309 // If this class's destructor is non-trivial it must be user-declared. 4310 CXXDestructorDecl *Dtor = RD->getDestructor(); 4311 assert(Dtor && "class has literal fields and bases but no dtor?"); 4312 if (!Dtor) 4313 return true; 4314 4315 Diag(Dtor->getLocation(), Dtor->isUserProvided() ? 4316 diag::note_non_literal_user_provided_dtor : 4317 diag::note_non_literal_nontrivial_dtor) << RD; 4318 } 4319 4320 return true; 4321} 4322 4323/// \brief Retrieve a version of the type 'T' that is elaborated by Keyword 4324/// and qualified by the nested-name-specifier contained in SS. 4325QualType Sema::getElaboratedType(ElaboratedTypeKeyword Keyword, 4326 const CXXScopeSpec &SS, QualType T) { 4327 if (T.isNull()) 4328 return T; 4329 NestedNameSpecifier *NNS; 4330 if (SS.isValid()) 4331 NNS = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 4332 else { 4333 if (Keyword == ETK_None) 4334 return T; 4335 NNS = 0; 4336 } 4337 return Context.getElaboratedType(Keyword, NNS, T); 4338} 4339 4340QualType Sema::BuildTypeofExprType(Expr *E, SourceLocation Loc) { 4341 ExprResult ER = CheckPlaceholderExpr(E); 4342 if (ER.isInvalid()) return QualType(); 4343 E = ER.take(); 4344 4345 if (!E->isTypeDependent()) { 4346 QualType T = E->getType(); 4347 if (const TagType *TT = T->getAs<TagType>()) 4348 DiagnoseUseOfDecl(TT->getDecl(), E->getExprLoc()); 4349 } 4350 return Context.getTypeOfExprType(E); 4351} 4352 4353QualType Sema::BuildDecltypeType(Expr *E, SourceLocation Loc) { 4354 ExprResult ER = CheckPlaceholderExpr(E); 4355 if (ER.isInvalid()) return QualType(); 4356 E = ER.take(); 4357 4358 return Context.getDecltypeType(E); 4359} 4360 4361QualType Sema::BuildUnaryTransformType(QualType BaseType, 4362 UnaryTransformType::UTTKind UKind, 4363 SourceLocation Loc) { 4364 switch (UKind) { 4365 case UnaryTransformType::EnumUnderlyingType: 4366 if (!BaseType->isDependentType() && !BaseType->isEnumeralType()) { 4367 Diag(Loc, diag::err_only_enums_have_underlying_types); 4368 return QualType(); 4369 } else { 4370 QualType Underlying = BaseType; 4371 if (!BaseType->isDependentType()) { 4372 EnumDecl *ED = BaseType->getAs<EnumType>()->getDecl(); 4373 assert(ED && "EnumType has no EnumDecl"); 4374 DiagnoseUseOfDecl(ED, Loc); 4375 Underlying = ED->getIntegerType(); 4376 } 4377 assert(!Underlying.isNull()); 4378 return Context.getUnaryTransformType(BaseType, Underlying, 4379 UnaryTransformType::EnumUnderlyingType); 4380 } 4381 } 4382 llvm_unreachable("unknown unary transform type"); 4383} 4384 4385QualType Sema::BuildAtomicType(QualType T, SourceLocation Loc) { 4386 if (!T->isDependentType()) { 4387 int DisallowedKind = -1; 4388 if (T->isIncompleteType()) 4389 // FIXME: It isn't entirely clear whether incomplete atomic types 4390 // are allowed or not; for simplicity, ban them for the moment. 4391 DisallowedKind = 0; 4392 else if (T->isArrayType()) 4393 DisallowedKind = 1; 4394 else if (T->isFunctionType()) 4395 DisallowedKind = 2; 4396 else if (T->isReferenceType()) 4397 DisallowedKind = 3; 4398 else if (T->isAtomicType()) 4399 DisallowedKind = 4; 4400 else if (T.hasQualifiers()) 4401 DisallowedKind = 5; 4402 else if (!T.isTriviallyCopyableType(Context)) 4403 // Some other non-trivially-copyable type (probably a C++ class) 4404 DisallowedKind = 6; 4405 4406 if (DisallowedKind != -1) { 4407 Diag(Loc, diag::err_atomic_specifier_bad_type) << DisallowedKind << T; 4408 return QualType(); 4409 } 4410 4411 // FIXME: Do we need any handling for ARC here? 4412 } 4413 4414 // Build the pointer type. 4415 return Context.getAtomicType(T); 4416} 4417