SemaType.cpp revision 59c0a818a79be850f7ae8fdafd57a1710e5b809a
1//===--- SemaType.cpp - Semantic Analysis for Types -----------------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements type-related semantic analysis. 11// 12//===----------------------------------------------------------------------===// 13 14#include "clang/Sema/ScopeInfo.h" 15#include "clang/Sema/SemaInternal.h" 16#include "clang/Sema/Template.h" 17#include "clang/Basic/OpenCL.h" 18#include "clang/AST/ASTContext.h" 19#include "clang/AST/ASTMutationListener.h" 20#include "clang/AST/CXXInheritance.h" 21#include "clang/AST/DeclObjC.h" 22#include "clang/AST/DeclTemplate.h" 23#include "clang/AST/TypeLoc.h" 24#include "clang/AST/TypeLocVisitor.h" 25#include "clang/AST/Expr.h" 26#include "clang/Basic/PartialDiagnostic.h" 27#include "clang/Basic/TargetInfo.h" 28#include "clang/Lex/Preprocessor.h" 29#include "clang/Parse/ParseDiagnostic.h" 30#include "clang/Sema/DeclSpec.h" 31#include "clang/Sema/DelayedDiagnostic.h" 32#include "clang/Sema/Lookup.h" 33#include "llvm/ADT/SmallPtrSet.h" 34#include "llvm/Support/ErrorHandling.h" 35using namespace clang; 36 37/// isOmittedBlockReturnType - Return true if this declarator is missing a 38/// return type because this is a omitted return type on a block literal. 39static bool isOmittedBlockReturnType(const Declarator &D) { 40 if (D.getContext() != Declarator::BlockLiteralContext || 41 D.getDeclSpec().hasTypeSpecifier()) 42 return false; 43 44 if (D.getNumTypeObjects() == 0) 45 return true; // ^{ ... } 46 47 if (D.getNumTypeObjects() == 1 && 48 D.getTypeObject(0).Kind == DeclaratorChunk::Function) 49 return true; // ^(int X, float Y) { ... } 50 51 return false; 52} 53 54/// diagnoseBadTypeAttribute - Diagnoses a type attribute which 55/// doesn't apply to the given type. 56static void diagnoseBadTypeAttribute(Sema &S, const AttributeList &attr, 57 QualType type) { 58 bool useExpansionLoc = false; 59 60 unsigned diagID = 0; 61 switch (attr.getKind()) { 62 case AttributeList::AT_ObjCGC: 63 diagID = diag::warn_pointer_attribute_wrong_type; 64 useExpansionLoc = true; 65 break; 66 67 case AttributeList::AT_ObjCOwnership: 68 diagID = diag::warn_objc_object_attribute_wrong_type; 69 useExpansionLoc = true; 70 break; 71 72 default: 73 // Assume everything else was a function attribute. 74 diagID = diag::warn_function_attribute_wrong_type; 75 break; 76 } 77 78 SourceLocation loc = attr.getLoc(); 79 StringRef name = attr.getName()->getName(); 80 81 // The GC attributes are usually written with macros; special-case them. 82 if (useExpansionLoc && loc.isMacroID() && attr.getParameterName()) { 83 if (attr.getParameterName()->isStr("strong")) { 84 if (S.findMacroSpelling(loc, "__strong")) name = "__strong"; 85 } else if (attr.getParameterName()->isStr("weak")) { 86 if (S.findMacroSpelling(loc, "__weak")) name = "__weak"; 87 } 88 } 89 90 S.Diag(loc, diagID) << name << type; 91} 92 93// objc_gc applies to Objective-C pointers or, otherwise, to the 94// smallest available pointer type (i.e. 'void*' in 'void**'). 95#define OBJC_POINTER_TYPE_ATTRS_CASELIST \ 96 case AttributeList::AT_ObjCGC: \ 97 case AttributeList::AT_ObjCOwnership 98 99// Function type attributes. 100#define FUNCTION_TYPE_ATTRS_CASELIST \ 101 case AttributeList::AT_NoReturn: \ 102 case AttributeList::AT_CDecl: \ 103 case AttributeList::AT_FastCall: \ 104 case AttributeList::AT_StdCall: \ 105 case AttributeList::AT_ThisCall: \ 106 case AttributeList::AT_Pascal: \ 107 case AttributeList::AT_Regparm: \ 108 case AttributeList::AT_Pcs \ 109 110namespace { 111 /// An object which stores processing state for the entire 112 /// GetTypeForDeclarator process. 113 class TypeProcessingState { 114 Sema &sema; 115 116 /// The declarator being processed. 117 Declarator &declarator; 118 119 /// The index of the declarator chunk we're currently processing. 120 /// May be the total number of valid chunks, indicating the 121 /// DeclSpec. 122 unsigned chunkIndex; 123 124 /// Whether there are non-trivial modifications to the decl spec. 125 bool trivial; 126 127 /// Whether we saved the attributes in the decl spec. 128 bool hasSavedAttrs; 129 130 /// The original set of attributes on the DeclSpec. 131 SmallVector<AttributeList*, 2> savedAttrs; 132 133 /// A list of attributes to diagnose the uselessness of when the 134 /// processing is complete. 135 SmallVector<AttributeList*, 2> ignoredTypeAttrs; 136 137 public: 138 TypeProcessingState(Sema &sema, Declarator &declarator) 139 : sema(sema), declarator(declarator), 140 chunkIndex(declarator.getNumTypeObjects()), 141 trivial(true), hasSavedAttrs(false) {} 142 143 Sema &getSema() const { 144 return sema; 145 } 146 147 Declarator &getDeclarator() const { 148 return declarator; 149 } 150 151 unsigned getCurrentChunkIndex() const { 152 return chunkIndex; 153 } 154 155 void setCurrentChunkIndex(unsigned idx) { 156 assert(idx <= declarator.getNumTypeObjects()); 157 chunkIndex = idx; 158 } 159 160 AttributeList *&getCurrentAttrListRef() const { 161 assert(chunkIndex <= declarator.getNumTypeObjects()); 162 if (chunkIndex == declarator.getNumTypeObjects()) 163 return getMutableDeclSpec().getAttributes().getListRef(); 164 return declarator.getTypeObject(chunkIndex).getAttrListRef(); 165 } 166 167 /// Save the current set of attributes on the DeclSpec. 168 void saveDeclSpecAttrs() { 169 // Don't try to save them multiple times. 170 if (hasSavedAttrs) return; 171 172 DeclSpec &spec = getMutableDeclSpec(); 173 for (AttributeList *attr = spec.getAttributes().getList(); attr; 174 attr = attr->getNext()) 175 savedAttrs.push_back(attr); 176 trivial &= savedAttrs.empty(); 177 hasSavedAttrs = true; 178 } 179 180 /// Record that we had nowhere to put the given type attribute. 181 /// We will diagnose such attributes later. 182 void addIgnoredTypeAttr(AttributeList &attr) { 183 ignoredTypeAttrs.push_back(&attr); 184 } 185 186 /// Diagnose all the ignored type attributes, given that the 187 /// declarator worked out to the given type. 188 void diagnoseIgnoredTypeAttrs(QualType type) const { 189 for (SmallVectorImpl<AttributeList*>::const_iterator 190 i = ignoredTypeAttrs.begin(), e = ignoredTypeAttrs.end(); 191 i != e; ++i) 192 diagnoseBadTypeAttribute(getSema(), **i, type); 193 } 194 195 ~TypeProcessingState() { 196 if (trivial) return; 197 198 restoreDeclSpecAttrs(); 199 } 200 201 private: 202 DeclSpec &getMutableDeclSpec() const { 203 return const_cast<DeclSpec&>(declarator.getDeclSpec()); 204 } 205 206 void restoreDeclSpecAttrs() { 207 assert(hasSavedAttrs); 208 209 if (savedAttrs.empty()) { 210 getMutableDeclSpec().getAttributes().set(0); 211 return; 212 } 213 214 getMutableDeclSpec().getAttributes().set(savedAttrs[0]); 215 for (unsigned i = 0, e = savedAttrs.size() - 1; i != e; ++i) 216 savedAttrs[i]->setNext(savedAttrs[i+1]); 217 savedAttrs.back()->setNext(0); 218 } 219 }; 220 221 /// Basically std::pair except that we really want to avoid an 222 /// implicit operator= for safety concerns. It's also a minor 223 /// link-time optimization for this to be a private type. 224 struct AttrAndList { 225 /// The attribute. 226 AttributeList &first; 227 228 /// The head of the list the attribute is currently in. 229 AttributeList *&second; 230 231 AttrAndList(AttributeList &attr, AttributeList *&head) 232 : first(attr), second(head) {} 233 }; 234} 235 236namespace llvm { 237 template <> struct isPodLike<AttrAndList> { 238 static const bool value = true; 239 }; 240} 241 242static void spliceAttrIntoList(AttributeList &attr, AttributeList *&head) { 243 attr.setNext(head); 244 head = &attr; 245} 246 247static void spliceAttrOutOfList(AttributeList &attr, AttributeList *&head) { 248 if (head == &attr) { 249 head = attr.getNext(); 250 return; 251 } 252 253 AttributeList *cur = head; 254 while (true) { 255 assert(cur && cur->getNext() && "ran out of attrs?"); 256 if (cur->getNext() == &attr) { 257 cur->setNext(attr.getNext()); 258 return; 259 } 260 cur = cur->getNext(); 261 } 262} 263 264static void moveAttrFromListToList(AttributeList &attr, 265 AttributeList *&fromList, 266 AttributeList *&toList) { 267 spliceAttrOutOfList(attr, fromList); 268 spliceAttrIntoList(attr, toList); 269} 270 271static void processTypeAttrs(TypeProcessingState &state, 272 QualType &type, bool isDeclSpec, 273 AttributeList *attrs); 274 275static bool handleFunctionTypeAttr(TypeProcessingState &state, 276 AttributeList &attr, 277 QualType &type); 278 279static bool handleObjCGCTypeAttr(TypeProcessingState &state, 280 AttributeList &attr, QualType &type); 281 282static bool handleObjCOwnershipTypeAttr(TypeProcessingState &state, 283 AttributeList &attr, QualType &type); 284 285static bool handleObjCPointerTypeAttr(TypeProcessingState &state, 286 AttributeList &attr, QualType &type) { 287 if (attr.getKind() == AttributeList::AT_ObjCGC) 288 return handleObjCGCTypeAttr(state, attr, type); 289 assert(attr.getKind() == AttributeList::AT_ObjCOwnership); 290 return handleObjCOwnershipTypeAttr(state, attr, type); 291} 292 293/// Given that an objc_gc attribute was written somewhere on a 294/// declaration *other* than on the declarator itself (for which, use 295/// distributeObjCPointerTypeAttrFromDeclarator), and given that it 296/// didn't apply in whatever position it was written in, try to move 297/// it to a more appropriate position. 298static void distributeObjCPointerTypeAttr(TypeProcessingState &state, 299 AttributeList &attr, 300 QualType type) { 301 Declarator &declarator = state.getDeclarator(); 302 for (unsigned i = state.getCurrentChunkIndex(); i != 0; --i) { 303 DeclaratorChunk &chunk = declarator.getTypeObject(i-1); 304 switch (chunk.Kind) { 305 case DeclaratorChunk::Pointer: 306 case DeclaratorChunk::BlockPointer: 307 moveAttrFromListToList(attr, state.getCurrentAttrListRef(), 308 chunk.getAttrListRef()); 309 return; 310 311 case DeclaratorChunk::Paren: 312 case DeclaratorChunk::Array: 313 continue; 314 315 // Don't walk through these. 316 case DeclaratorChunk::Reference: 317 case DeclaratorChunk::Function: 318 case DeclaratorChunk::MemberPointer: 319 goto error; 320 } 321 } 322 error: 323 324 diagnoseBadTypeAttribute(state.getSema(), attr, type); 325} 326 327/// Distribute an objc_gc type attribute that was written on the 328/// declarator. 329static void 330distributeObjCPointerTypeAttrFromDeclarator(TypeProcessingState &state, 331 AttributeList &attr, 332 QualType &declSpecType) { 333 Declarator &declarator = state.getDeclarator(); 334 335 // objc_gc goes on the innermost pointer to something that's not a 336 // pointer. 337 unsigned innermost = -1U; 338 bool considerDeclSpec = true; 339 for (unsigned i = 0, e = declarator.getNumTypeObjects(); i != e; ++i) { 340 DeclaratorChunk &chunk = declarator.getTypeObject(i); 341 switch (chunk.Kind) { 342 case DeclaratorChunk::Pointer: 343 case DeclaratorChunk::BlockPointer: 344 innermost = i; 345 continue; 346 347 case DeclaratorChunk::Reference: 348 case DeclaratorChunk::MemberPointer: 349 case DeclaratorChunk::Paren: 350 case DeclaratorChunk::Array: 351 continue; 352 353 case DeclaratorChunk::Function: 354 considerDeclSpec = false; 355 goto done; 356 } 357 } 358 done: 359 360 // That might actually be the decl spec if we weren't blocked by 361 // anything in the declarator. 362 if (considerDeclSpec) { 363 if (handleObjCPointerTypeAttr(state, attr, declSpecType)) { 364 // Splice the attribute into the decl spec. Prevents the 365 // attribute from being applied multiple times and gives 366 // the source-location-filler something to work with. 367 state.saveDeclSpecAttrs(); 368 moveAttrFromListToList(attr, declarator.getAttrListRef(), 369 declarator.getMutableDeclSpec().getAttributes().getListRef()); 370 return; 371 } 372 } 373 374 // Otherwise, if we found an appropriate chunk, splice the attribute 375 // into it. 376 if (innermost != -1U) { 377 moveAttrFromListToList(attr, declarator.getAttrListRef(), 378 declarator.getTypeObject(innermost).getAttrListRef()); 379 return; 380 } 381 382 // Otherwise, diagnose when we're done building the type. 383 spliceAttrOutOfList(attr, declarator.getAttrListRef()); 384 state.addIgnoredTypeAttr(attr); 385} 386 387/// A function type attribute was written somewhere in a declaration 388/// *other* than on the declarator itself or in the decl spec. Given 389/// that it didn't apply in whatever position it was written in, try 390/// to move it to a more appropriate position. 391static void distributeFunctionTypeAttr(TypeProcessingState &state, 392 AttributeList &attr, 393 QualType type) { 394 Declarator &declarator = state.getDeclarator(); 395 396 // Try to push the attribute from the return type of a function to 397 // the function itself. 398 for (unsigned i = state.getCurrentChunkIndex(); i != 0; --i) { 399 DeclaratorChunk &chunk = declarator.getTypeObject(i-1); 400 switch (chunk.Kind) { 401 case DeclaratorChunk::Function: 402 moveAttrFromListToList(attr, state.getCurrentAttrListRef(), 403 chunk.getAttrListRef()); 404 return; 405 406 case DeclaratorChunk::Paren: 407 case DeclaratorChunk::Pointer: 408 case DeclaratorChunk::BlockPointer: 409 case DeclaratorChunk::Array: 410 case DeclaratorChunk::Reference: 411 case DeclaratorChunk::MemberPointer: 412 continue; 413 } 414 } 415 416 diagnoseBadTypeAttribute(state.getSema(), attr, type); 417} 418 419/// Try to distribute a function type attribute to the innermost 420/// function chunk or type. Returns true if the attribute was 421/// distributed, false if no location was found. 422static bool 423distributeFunctionTypeAttrToInnermost(TypeProcessingState &state, 424 AttributeList &attr, 425 AttributeList *&attrList, 426 QualType &declSpecType) { 427 Declarator &declarator = state.getDeclarator(); 428 429 // Put it on the innermost function chunk, if there is one. 430 for (unsigned i = 0, e = declarator.getNumTypeObjects(); i != e; ++i) { 431 DeclaratorChunk &chunk = declarator.getTypeObject(i); 432 if (chunk.Kind != DeclaratorChunk::Function) continue; 433 434 moveAttrFromListToList(attr, attrList, chunk.getAttrListRef()); 435 return true; 436 } 437 438 if (handleFunctionTypeAttr(state, attr, declSpecType)) { 439 spliceAttrOutOfList(attr, attrList); 440 return true; 441 } 442 443 return false; 444} 445 446/// A function type attribute was written in the decl spec. Try to 447/// apply it somewhere. 448static void 449distributeFunctionTypeAttrFromDeclSpec(TypeProcessingState &state, 450 AttributeList &attr, 451 QualType &declSpecType) { 452 state.saveDeclSpecAttrs(); 453 454 // Try to distribute to the innermost. 455 if (distributeFunctionTypeAttrToInnermost(state, attr, 456 state.getCurrentAttrListRef(), 457 declSpecType)) 458 return; 459 460 // If that failed, diagnose the bad attribute when the declarator is 461 // fully built. 462 state.addIgnoredTypeAttr(attr); 463} 464 465/// A function type attribute was written on the declarator. Try to 466/// apply it somewhere. 467static void 468distributeFunctionTypeAttrFromDeclarator(TypeProcessingState &state, 469 AttributeList &attr, 470 QualType &declSpecType) { 471 Declarator &declarator = state.getDeclarator(); 472 473 // Try to distribute to the innermost. 474 if (distributeFunctionTypeAttrToInnermost(state, attr, 475 declarator.getAttrListRef(), 476 declSpecType)) 477 return; 478 479 // If that failed, diagnose the bad attribute when the declarator is 480 // fully built. 481 spliceAttrOutOfList(attr, declarator.getAttrListRef()); 482 state.addIgnoredTypeAttr(attr); 483} 484 485/// \brief Given that there are attributes written on the declarator 486/// itself, try to distribute any type attributes to the appropriate 487/// declarator chunk. 488/// 489/// These are attributes like the following: 490/// int f ATTR; 491/// int (f ATTR)(); 492/// but not necessarily this: 493/// int f() ATTR; 494static void distributeTypeAttrsFromDeclarator(TypeProcessingState &state, 495 QualType &declSpecType) { 496 // Collect all the type attributes from the declarator itself. 497 assert(state.getDeclarator().getAttributes() && "declarator has no attrs!"); 498 AttributeList *attr = state.getDeclarator().getAttributes(); 499 AttributeList *next; 500 do { 501 next = attr->getNext(); 502 503 switch (attr->getKind()) { 504 OBJC_POINTER_TYPE_ATTRS_CASELIST: 505 distributeObjCPointerTypeAttrFromDeclarator(state, *attr, declSpecType); 506 break; 507 508 case AttributeList::AT_NSReturnsRetained: 509 if (!state.getSema().getLangOpts().ObjCAutoRefCount) 510 break; 511 // fallthrough 512 513 FUNCTION_TYPE_ATTRS_CASELIST: 514 distributeFunctionTypeAttrFromDeclarator(state, *attr, declSpecType); 515 break; 516 517 default: 518 break; 519 } 520 } while ((attr = next)); 521} 522 523/// Add a synthetic '()' to a block-literal declarator if it is 524/// required, given the return type. 525static void maybeSynthesizeBlockSignature(TypeProcessingState &state, 526 QualType declSpecType) { 527 Declarator &declarator = state.getDeclarator(); 528 529 // First, check whether the declarator would produce a function, 530 // i.e. whether the innermost semantic chunk is a function. 531 if (declarator.isFunctionDeclarator()) { 532 // If so, make that declarator a prototyped declarator. 533 declarator.getFunctionTypeInfo().hasPrototype = true; 534 return; 535 } 536 537 // If there are any type objects, the type as written won't name a 538 // function, regardless of the decl spec type. This is because a 539 // block signature declarator is always an abstract-declarator, and 540 // abstract-declarators can't just be parentheses chunks. Therefore 541 // we need to build a function chunk unless there are no type 542 // objects and the decl spec type is a function. 543 if (!declarator.getNumTypeObjects() && declSpecType->isFunctionType()) 544 return; 545 546 // Note that there *are* cases with invalid declarators where 547 // declarators consist solely of parentheses. In general, these 548 // occur only in failed efforts to make function declarators, so 549 // faking up the function chunk is still the right thing to do. 550 551 // Otherwise, we need to fake up a function declarator. 552 SourceLocation loc = declarator.getLocStart(); 553 554 // ...and *prepend* it to the declarator. 555 SourceLocation NoLoc; 556 declarator.AddInnermostTypeInfo(DeclaratorChunk::getFunction( 557 /*HasProto=*/true, 558 /*IsAmbiguous=*/false, 559 /*LParenLoc=*/NoLoc, 560 /*ArgInfo=*/0, 561 /*NumArgs=*/0, 562 /*EllipsisLoc=*/NoLoc, 563 /*RParenLoc=*/NoLoc, 564 /*TypeQuals=*/0, 565 /*RefQualifierIsLvalueRef=*/true, 566 /*RefQualifierLoc=*/NoLoc, 567 /*ConstQualifierLoc=*/NoLoc, 568 /*VolatileQualifierLoc=*/NoLoc, 569 /*MutableLoc=*/NoLoc, 570 EST_None, 571 /*ESpecLoc=*/NoLoc, 572 /*Exceptions=*/0, 573 /*ExceptionRanges=*/0, 574 /*NumExceptions=*/0, 575 /*NoexceptExpr=*/0, 576 loc, loc, declarator)); 577 578 // For consistency, make sure the state still has us as processing 579 // the decl spec. 580 assert(state.getCurrentChunkIndex() == declarator.getNumTypeObjects() - 1); 581 state.setCurrentChunkIndex(declarator.getNumTypeObjects()); 582} 583 584/// \brief Convert the specified declspec to the appropriate type 585/// object. 586/// \param state Specifies the declarator containing the declaration specifier 587/// to be converted, along with other associated processing state. 588/// \returns The type described by the declaration specifiers. This function 589/// never returns null. 590static QualType ConvertDeclSpecToType(TypeProcessingState &state) { 591 // FIXME: Should move the logic from DeclSpec::Finish to here for validity 592 // checking. 593 594 Sema &S = state.getSema(); 595 Declarator &declarator = state.getDeclarator(); 596 const DeclSpec &DS = declarator.getDeclSpec(); 597 SourceLocation DeclLoc = declarator.getIdentifierLoc(); 598 if (DeclLoc.isInvalid()) 599 DeclLoc = DS.getLocStart(); 600 601 ASTContext &Context = S.Context; 602 603 QualType Result; 604 switch (DS.getTypeSpecType()) { 605 case DeclSpec::TST_void: 606 Result = Context.VoidTy; 607 break; 608 case DeclSpec::TST_char: 609 if (DS.getTypeSpecSign() == DeclSpec::TSS_unspecified) 610 Result = Context.CharTy; 611 else if (DS.getTypeSpecSign() == DeclSpec::TSS_signed) 612 Result = Context.SignedCharTy; 613 else { 614 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unsigned && 615 "Unknown TSS value"); 616 Result = Context.UnsignedCharTy; 617 } 618 break; 619 case DeclSpec::TST_wchar: 620 if (DS.getTypeSpecSign() == DeclSpec::TSS_unspecified) 621 Result = Context.WCharTy; 622 else if (DS.getTypeSpecSign() == DeclSpec::TSS_signed) { 623 S.Diag(DS.getTypeSpecSignLoc(), diag::ext_invalid_sign_spec) 624 << DS.getSpecifierName(DS.getTypeSpecType()); 625 Result = Context.getSignedWCharType(); 626 } else { 627 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unsigned && 628 "Unknown TSS value"); 629 S.Diag(DS.getTypeSpecSignLoc(), diag::ext_invalid_sign_spec) 630 << DS.getSpecifierName(DS.getTypeSpecType()); 631 Result = Context.getUnsignedWCharType(); 632 } 633 break; 634 case DeclSpec::TST_char16: 635 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unspecified && 636 "Unknown TSS value"); 637 Result = Context.Char16Ty; 638 break; 639 case DeclSpec::TST_char32: 640 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unspecified && 641 "Unknown TSS value"); 642 Result = Context.Char32Ty; 643 break; 644 case DeclSpec::TST_unspecified: 645 // "<proto1,proto2>" is an objc qualified ID with a missing id. 646 if (DeclSpec::ProtocolQualifierListTy PQ = DS.getProtocolQualifiers()) { 647 Result = Context.getObjCObjectType(Context.ObjCBuiltinIdTy, 648 (ObjCProtocolDecl*const*)PQ, 649 DS.getNumProtocolQualifiers()); 650 Result = Context.getObjCObjectPointerType(Result); 651 break; 652 } 653 654 // If this is a missing declspec in a block literal return context, then it 655 // is inferred from the return statements inside the block. 656 // The declspec is always missing in a lambda expr context; it is either 657 // specified with a trailing return type or inferred. 658 if (declarator.getContext() == Declarator::LambdaExprContext || 659 isOmittedBlockReturnType(declarator)) { 660 Result = Context.DependentTy; 661 break; 662 } 663 664 // Unspecified typespec defaults to int in C90. However, the C90 grammar 665 // [C90 6.5] only allows a decl-spec if there was *some* type-specifier, 666 // type-qualifier, or storage-class-specifier. If not, emit an extwarn. 667 // Note that the one exception to this is function definitions, which are 668 // allowed to be completely missing a declspec. This is handled in the 669 // parser already though by it pretending to have seen an 'int' in this 670 // case. 671 if (S.getLangOpts().ImplicitInt) { 672 // In C89 mode, we only warn if there is a completely missing declspec 673 // when one is not allowed. 674 if (DS.isEmpty()) { 675 S.Diag(DeclLoc, diag::ext_missing_declspec) 676 << DS.getSourceRange() 677 << FixItHint::CreateInsertion(DS.getLocStart(), "int"); 678 } 679 } else if (!DS.hasTypeSpecifier()) { 680 // C99 and C++ require a type specifier. For example, C99 6.7.2p2 says: 681 // "At least one type specifier shall be given in the declaration 682 // specifiers in each declaration, and in the specifier-qualifier list in 683 // each struct declaration and type name." 684 // FIXME: Does Microsoft really have the implicit int extension in C++? 685 if (S.getLangOpts().CPlusPlus && 686 !S.getLangOpts().MicrosoftExt) { 687 S.Diag(DeclLoc, diag::err_missing_type_specifier) 688 << DS.getSourceRange(); 689 690 // When this occurs in C++ code, often something is very broken with the 691 // value being declared, poison it as invalid so we don't get chains of 692 // errors. 693 declarator.setInvalidType(true); 694 } else { 695 S.Diag(DeclLoc, diag::ext_missing_type_specifier) 696 << DS.getSourceRange(); 697 } 698 } 699 700 // FALL THROUGH. 701 case DeclSpec::TST_int: { 702 if (DS.getTypeSpecSign() != DeclSpec::TSS_unsigned) { 703 switch (DS.getTypeSpecWidth()) { 704 case DeclSpec::TSW_unspecified: Result = Context.IntTy; break; 705 case DeclSpec::TSW_short: Result = Context.ShortTy; break; 706 case DeclSpec::TSW_long: Result = Context.LongTy; break; 707 case DeclSpec::TSW_longlong: 708 Result = Context.LongLongTy; 709 710 // 'long long' is a C99 or C++11 feature. 711 if (!S.getLangOpts().C99) { 712 if (S.getLangOpts().CPlusPlus) 713 S.Diag(DS.getTypeSpecWidthLoc(), 714 S.getLangOpts().CPlusPlus0x ? 715 diag::warn_cxx98_compat_longlong : diag::ext_cxx11_longlong); 716 else 717 S.Diag(DS.getTypeSpecWidthLoc(), diag::ext_c99_longlong); 718 } 719 break; 720 } 721 } else { 722 switch (DS.getTypeSpecWidth()) { 723 case DeclSpec::TSW_unspecified: Result = Context.UnsignedIntTy; break; 724 case DeclSpec::TSW_short: Result = Context.UnsignedShortTy; break; 725 case DeclSpec::TSW_long: Result = Context.UnsignedLongTy; break; 726 case DeclSpec::TSW_longlong: 727 Result = Context.UnsignedLongLongTy; 728 729 // 'long long' is a C99 or C++11 feature. 730 if (!S.getLangOpts().C99) { 731 if (S.getLangOpts().CPlusPlus) 732 S.Diag(DS.getTypeSpecWidthLoc(), 733 S.getLangOpts().CPlusPlus0x ? 734 diag::warn_cxx98_compat_longlong : diag::ext_cxx11_longlong); 735 else 736 S.Diag(DS.getTypeSpecWidthLoc(), diag::ext_c99_longlong); 737 } 738 break; 739 } 740 } 741 break; 742 } 743 case DeclSpec::TST_int128: 744 if (DS.getTypeSpecSign() == DeclSpec::TSS_unsigned) 745 Result = Context.UnsignedInt128Ty; 746 else 747 Result = Context.Int128Ty; 748 break; 749 case DeclSpec::TST_half: Result = Context.HalfTy; break; 750 case DeclSpec::TST_float: Result = Context.FloatTy; break; 751 case DeclSpec::TST_double: 752 if (DS.getTypeSpecWidth() == DeclSpec::TSW_long) 753 Result = Context.LongDoubleTy; 754 else 755 Result = Context.DoubleTy; 756 757 if (S.getLangOpts().OpenCL && !S.getOpenCLOptions().cl_khr_fp64) { 758 S.Diag(DS.getTypeSpecTypeLoc(), diag::err_double_requires_fp64); 759 declarator.setInvalidType(true); 760 } 761 break; 762 case DeclSpec::TST_bool: Result = Context.BoolTy; break; // _Bool or bool 763 case DeclSpec::TST_decimal32: // _Decimal32 764 case DeclSpec::TST_decimal64: // _Decimal64 765 case DeclSpec::TST_decimal128: // _Decimal128 766 S.Diag(DS.getTypeSpecTypeLoc(), diag::err_decimal_unsupported); 767 Result = Context.IntTy; 768 declarator.setInvalidType(true); 769 break; 770 case DeclSpec::TST_class: 771 case DeclSpec::TST_enum: 772 case DeclSpec::TST_union: 773 case DeclSpec::TST_struct: 774 case DeclSpec::TST_interface: { 775 TypeDecl *D = dyn_cast_or_null<TypeDecl>(DS.getRepAsDecl()); 776 if (!D) { 777 // This can happen in C++ with ambiguous lookups. 778 Result = Context.IntTy; 779 declarator.setInvalidType(true); 780 break; 781 } 782 783 // If the type is deprecated or unavailable, diagnose it. 784 S.DiagnoseUseOfDecl(D, DS.getTypeSpecTypeNameLoc()); 785 786 assert(DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 && 787 DS.getTypeSpecSign() == 0 && "No qualifiers on tag names!"); 788 789 // TypeQuals handled by caller. 790 Result = Context.getTypeDeclType(D); 791 792 // In both C and C++, make an ElaboratedType. 793 ElaboratedTypeKeyword Keyword 794 = ElaboratedType::getKeywordForTypeSpec(DS.getTypeSpecType()); 795 Result = S.getElaboratedType(Keyword, DS.getTypeSpecScope(), Result); 796 break; 797 } 798 case DeclSpec::TST_typename: { 799 assert(DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 && 800 DS.getTypeSpecSign() == 0 && 801 "Can't handle qualifiers on typedef names yet!"); 802 Result = S.GetTypeFromParser(DS.getRepAsType()); 803 if (Result.isNull()) 804 declarator.setInvalidType(true); 805 else if (DeclSpec::ProtocolQualifierListTy PQ 806 = DS.getProtocolQualifiers()) { 807 if (const ObjCObjectType *ObjT = Result->getAs<ObjCObjectType>()) { 808 // Silently drop any existing protocol qualifiers. 809 // TODO: determine whether that's the right thing to do. 810 if (ObjT->getNumProtocols()) 811 Result = ObjT->getBaseType(); 812 813 if (DS.getNumProtocolQualifiers()) 814 Result = Context.getObjCObjectType(Result, 815 (ObjCProtocolDecl*const*) PQ, 816 DS.getNumProtocolQualifiers()); 817 } else if (Result->isObjCIdType()) { 818 // id<protocol-list> 819 Result = Context.getObjCObjectType(Context.ObjCBuiltinIdTy, 820 (ObjCProtocolDecl*const*) PQ, 821 DS.getNumProtocolQualifiers()); 822 Result = Context.getObjCObjectPointerType(Result); 823 } else if (Result->isObjCClassType()) { 824 // Class<protocol-list> 825 Result = Context.getObjCObjectType(Context.ObjCBuiltinClassTy, 826 (ObjCProtocolDecl*const*) PQ, 827 DS.getNumProtocolQualifiers()); 828 Result = Context.getObjCObjectPointerType(Result); 829 } else { 830 S.Diag(DeclLoc, diag::err_invalid_protocol_qualifiers) 831 << DS.getSourceRange(); 832 declarator.setInvalidType(true); 833 } 834 } 835 836 // TypeQuals handled by caller. 837 break; 838 } 839 case DeclSpec::TST_typeofType: 840 // FIXME: Preserve type source info. 841 Result = S.GetTypeFromParser(DS.getRepAsType()); 842 assert(!Result.isNull() && "Didn't get a type for typeof?"); 843 if (!Result->isDependentType()) 844 if (const TagType *TT = Result->getAs<TagType>()) 845 S.DiagnoseUseOfDecl(TT->getDecl(), DS.getTypeSpecTypeLoc()); 846 // TypeQuals handled by caller. 847 Result = Context.getTypeOfType(Result); 848 break; 849 case DeclSpec::TST_typeofExpr: { 850 Expr *E = DS.getRepAsExpr(); 851 assert(E && "Didn't get an expression for typeof?"); 852 // TypeQuals handled by caller. 853 Result = S.BuildTypeofExprType(E, DS.getTypeSpecTypeLoc()); 854 if (Result.isNull()) { 855 Result = Context.IntTy; 856 declarator.setInvalidType(true); 857 } 858 break; 859 } 860 case DeclSpec::TST_decltype: { 861 Expr *E = DS.getRepAsExpr(); 862 assert(E && "Didn't get an expression for decltype?"); 863 // TypeQuals handled by caller. 864 Result = S.BuildDecltypeType(E, DS.getTypeSpecTypeLoc()); 865 if (Result.isNull()) { 866 Result = Context.IntTy; 867 declarator.setInvalidType(true); 868 } 869 break; 870 } 871 case DeclSpec::TST_underlyingType: 872 Result = S.GetTypeFromParser(DS.getRepAsType()); 873 assert(!Result.isNull() && "Didn't get a type for __underlying_type?"); 874 Result = S.BuildUnaryTransformType(Result, 875 UnaryTransformType::EnumUnderlyingType, 876 DS.getTypeSpecTypeLoc()); 877 if (Result.isNull()) { 878 Result = Context.IntTy; 879 declarator.setInvalidType(true); 880 } 881 break; 882 883 case DeclSpec::TST_auto: { 884 // TypeQuals handled by caller. 885 Result = Context.getAutoType(QualType()); 886 break; 887 } 888 889 case DeclSpec::TST_unknown_anytype: 890 Result = Context.UnknownAnyTy; 891 break; 892 893 case DeclSpec::TST_atomic: 894 Result = S.GetTypeFromParser(DS.getRepAsType()); 895 assert(!Result.isNull() && "Didn't get a type for _Atomic?"); 896 Result = S.BuildAtomicType(Result, DS.getTypeSpecTypeLoc()); 897 if (Result.isNull()) { 898 Result = Context.IntTy; 899 declarator.setInvalidType(true); 900 } 901 break; 902 903 case DeclSpec::TST_error: 904 Result = Context.IntTy; 905 declarator.setInvalidType(true); 906 break; 907 } 908 909 // Handle complex types. 910 if (DS.getTypeSpecComplex() == DeclSpec::TSC_complex) { 911 if (S.getLangOpts().Freestanding) 912 S.Diag(DS.getTypeSpecComplexLoc(), diag::ext_freestanding_complex); 913 Result = Context.getComplexType(Result); 914 } else if (DS.isTypeAltiVecVector()) { 915 unsigned typeSize = static_cast<unsigned>(Context.getTypeSize(Result)); 916 assert(typeSize > 0 && "type size for vector must be greater than 0 bits"); 917 VectorType::VectorKind VecKind = VectorType::AltiVecVector; 918 if (DS.isTypeAltiVecPixel()) 919 VecKind = VectorType::AltiVecPixel; 920 else if (DS.isTypeAltiVecBool()) 921 VecKind = VectorType::AltiVecBool; 922 Result = Context.getVectorType(Result, 128/typeSize, VecKind); 923 } 924 925 // FIXME: Imaginary. 926 if (DS.getTypeSpecComplex() == DeclSpec::TSC_imaginary) 927 S.Diag(DS.getTypeSpecComplexLoc(), diag::err_imaginary_not_supported); 928 929 // Before we process any type attributes, synthesize a block literal 930 // function declarator if necessary. 931 if (declarator.getContext() == Declarator::BlockLiteralContext) 932 maybeSynthesizeBlockSignature(state, Result); 933 934 // Apply any type attributes from the decl spec. This may cause the 935 // list of type attributes to be temporarily saved while the type 936 // attributes are pushed around. 937 if (AttributeList *attrs = DS.getAttributes().getList()) 938 processTypeAttrs(state, Result, true, attrs); 939 940 // Apply const/volatile/restrict qualifiers to T. 941 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 942 943 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 944 // or incomplete types shall not be restrict-qualified." C++ also allows 945 // restrict-qualified references. 946 if (TypeQuals & DeclSpec::TQ_restrict) { 947 if (Result->isAnyPointerType() || Result->isReferenceType()) { 948 QualType EltTy; 949 if (Result->isObjCObjectPointerType()) 950 EltTy = Result; 951 else 952 EltTy = Result->isPointerType() ? 953 Result->getAs<PointerType>()->getPointeeType() : 954 Result->getAs<ReferenceType>()->getPointeeType(); 955 956 // If we have a pointer or reference, the pointee must have an object 957 // incomplete type. 958 if (!EltTy->isIncompleteOrObjectType()) { 959 S.Diag(DS.getRestrictSpecLoc(), 960 diag::err_typecheck_invalid_restrict_invalid_pointee) 961 << EltTy << DS.getSourceRange(); 962 TypeQuals &= ~DeclSpec::TQ_restrict; // Remove the restrict qualifier. 963 } 964 } else { 965 S.Diag(DS.getRestrictSpecLoc(), 966 diag::err_typecheck_invalid_restrict_not_pointer) 967 << Result << DS.getSourceRange(); 968 TypeQuals &= ~DeclSpec::TQ_restrict; // Remove the restrict qualifier. 969 } 970 } 971 972 // Warn about CV qualifiers on functions: C99 6.7.3p8: "If the specification 973 // of a function type includes any type qualifiers, the behavior is 974 // undefined." 975 if (Result->isFunctionType() && TypeQuals) { 976 // Get some location to point at, either the C or V location. 977 SourceLocation Loc; 978 if (TypeQuals & DeclSpec::TQ_const) 979 Loc = DS.getConstSpecLoc(); 980 else if (TypeQuals & DeclSpec::TQ_volatile) 981 Loc = DS.getVolatileSpecLoc(); 982 else { 983 assert((TypeQuals & DeclSpec::TQ_restrict) && 984 "Has CVR quals but not C, V, or R?"); 985 Loc = DS.getRestrictSpecLoc(); 986 } 987 S.Diag(Loc, diag::warn_typecheck_function_qualifiers) 988 << Result << DS.getSourceRange(); 989 } 990 991 // C++ [dcl.ref]p1: 992 // Cv-qualified references are ill-formed except when the 993 // cv-qualifiers are introduced through the use of a typedef 994 // (7.1.3) or of a template type argument (14.3), in which 995 // case the cv-qualifiers are ignored. 996 // FIXME: Shouldn't we be checking SCS_typedef here? 997 if (DS.getTypeSpecType() == DeclSpec::TST_typename && 998 TypeQuals && Result->isReferenceType()) { 999 TypeQuals &= ~DeclSpec::TQ_const; 1000 TypeQuals &= ~DeclSpec::TQ_volatile; 1001 } 1002 1003 // C90 6.5.3 constraints: "The same type qualifier shall not appear more 1004 // than once in the same specifier-list or qualifier-list, either directly 1005 // or via one or more typedefs." 1006 if (!S.getLangOpts().C99 && !S.getLangOpts().CPlusPlus 1007 && TypeQuals & Result.getCVRQualifiers()) { 1008 if (TypeQuals & DeclSpec::TQ_const && Result.isConstQualified()) { 1009 S.Diag(DS.getConstSpecLoc(), diag::ext_duplicate_declspec) 1010 << "const"; 1011 } 1012 1013 if (TypeQuals & DeclSpec::TQ_volatile && Result.isVolatileQualified()) { 1014 S.Diag(DS.getVolatileSpecLoc(), diag::ext_duplicate_declspec) 1015 << "volatile"; 1016 } 1017 1018 // C90 doesn't have restrict, so it doesn't force us to produce a warning 1019 // in this case. 1020 } 1021 1022 Qualifiers Quals = Qualifiers::fromCVRMask(TypeQuals); 1023 Result = Context.getQualifiedType(Result, Quals); 1024 } 1025 1026 return Result; 1027} 1028 1029static std::string getPrintableNameForEntity(DeclarationName Entity) { 1030 if (Entity) 1031 return Entity.getAsString(); 1032 1033 return "type name"; 1034} 1035 1036QualType Sema::BuildQualifiedType(QualType T, SourceLocation Loc, 1037 Qualifiers Qs) { 1038 // Enforce C99 6.7.3p2: "Types other than pointer types derived from 1039 // object or incomplete types shall not be restrict-qualified." 1040 if (Qs.hasRestrict()) { 1041 unsigned DiagID = 0; 1042 QualType ProblemTy; 1043 1044 const Type *Ty = T->getCanonicalTypeInternal().getTypePtr(); 1045 if (const ReferenceType *RTy = dyn_cast<ReferenceType>(Ty)) { 1046 if (!RTy->getPointeeType()->isIncompleteOrObjectType()) { 1047 DiagID = diag::err_typecheck_invalid_restrict_invalid_pointee; 1048 ProblemTy = T->getAs<ReferenceType>()->getPointeeType(); 1049 } 1050 } else if (const PointerType *PTy = dyn_cast<PointerType>(Ty)) { 1051 if (!PTy->getPointeeType()->isIncompleteOrObjectType()) { 1052 DiagID = diag::err_typecheck_invalid_restrict_invalid_pointee; 1053 ProblemTy = T->getAs<PointerType>()->getPointeeType(); 1054 } 1055 } else if (const MemberPointerType *PTy = dyn_cast<MemberPointerType>(Ty)) { 1056 if (!PTy->getPointeeType()->isIncompleteOrObjectType()) { 1057 DiagID = diag::err_typecheck_invalid_restrict_invalid_pointee; 1058 ProblemTy = T->getAs<PointerType>()->getPointeeType(); 1059 } 1060 } else if (!Ty->isDependentType()) { 1061 // FIXME: this deserves a proper diagnostic 1062 DiagID = diag::err_typecheck_invalid_restrict_invalid_pointee; 1063 ProblemTy = T; 1064 } 1065 1066 if (DiagID) { 1067 Diag(Loc, DiagID) << ProblemTy; 1068 Qs.removeRestrict(); 1069 } 1070 } 1071 1072 return Context.getQualifiedType(T, Qs); 1073} 1074 1075/// \brief Build a paren type including \p T. 1076QualType Sema::BuildParenType(QualType T) { 1077 return Context.getParenType(T); 1078} 1079 1080/// Given that we're building a pointer or reference to the given 1081static QualType inferARCLifetimeForPointee(Sema &S, QualType type, 1082 SourceLocation loc, 1083 bool isReference) { 1084 // Bail out if retention is unrequired or already specified. 1085 if (!type->isObjCLifetimeType() || 1086 type.getObjCLifetime() != Qualifiers::OCL_None) 1087 return type; 1088 1089 Qualifiers::ObjCLifetime implicitLifetime = Qualifiers::OCL_None; 1090 1091 // If the object type is const-qualified, we can safely use 1092 // __unsafe_unretained. This is safe (because there are no read 1093 // barriers), and it'll be safe to coerce anything but __weak* to 1094 // the resulting type. 1095 if (type.isConstQualified()) { 1096 implicitLifetime = Qualifiers::OCL_ExplicitNone; 1097 1098 // Otherwise, check whether the static type does not require 1099 // retaining. This currently only triggers for Class (possibly 1100 // protocol-qualifed, and arrays thereof). 1101 } else if (type->isObjCARCImplicitlyUnretainedType()) { 1102 implicitLifetime = Qualifiers::OCL_ExplicitNone; 1103 1104 // If we are in an unevaluated context, like sizeof, skip adding a 1105 // qualification. 1106 } else if (S.isUnevaluatedContext()) { 1107 return type; 1108 1109 // If that failed, give an error and recover using __strong. __strong 1110 // is the option most likely to prevent spurious second-order diagnostics, 1111 // like when binding a reference to a field. 1112 } else { 1113 // These types can show up in private ivars in system headers, so 1114 // we need this to not be an error in those cases. Instead we 1115 // want to delay. 1116 if (S.DelayedDiagnostics.shouldDelayDiagnostics()) { 1117 S.DelayedDiagnostics.add( 1118 sema::DelayedDiagnostic::makeForbiddenType(loc, 1119 diag::err_arc_indirect_no_ownership, type, isReference)); 1120 } else { 1121 S.Diag(loc, diag::err_arc_indirect_no_ownership) << type << isReference; 1122 } 1123 implicitLifetime = Qualifiers::OCL_Strong; 1124 } 1125 assert(implicitLifetime && "didn't infer any lifetime!"); 1126 1127 Qualifiers qs; 1128 qs.addObjCLifetime(implicitLifetime); 1129 return S.Context.getQualifiedType(type, qs); 1130} 1131 1132/// \brief Build a pointer type. 1133/// 1134/// \param T The type to which we'll be building a pointer. 1135/// 1136/// \param Loc The location of the entity whose type involves this 1137/// pointer type or, if there is no such entity, the location of the 1138/// type that will have pointer type. 1139/// 1140/// \param Entity The name of the entity that involves the pointer 1141/// type, if known. 1142/// 1143/// \returns A suitable pointer type, if there are no 1144/// errors. Otherwise, returns a NULL type. 1145QualType Sema::BuildPointerType(QualType T, 1146 SourceLocation Loc, DeclarationName Entity) { 1147 if (T->isReferenceType()) { 1148 // C++ 8.3.2p4: There shall be no ... pointers to references ... 1149 Diag(Loc, diag::err_illegal_decl_pointer_to_reference) 1150 << getPrintableNameForEntity(Entity) << T; 1151 return QualType(); 1152 } 1153 1154 assert(!T->isObjCObjectType() && "Should build ObjCObjectPointerType"); 1155 1156 // In ARC, it is forbidden to build pointers to unqualified pointers. 1157 if (getLangOpts().ObjCAutoRefCount) 1158 T = inferARCLifetimeForPointee(*this, T, Loc, /*reference*/ false); 1159 1160 // Build the pointer type. 1161 return Context.getPointerType(T); 1162} 1163 1164/// \brief Build a reference type. 1165/// 1166/// \param T The type to which we'll be building a reference. 1167/// 1168/// \param Loc The location of the entity whose type involves this 1169/// reference type or, if there is no such entity, the location of the 1170/// type that will have reference type. 1171/// 1172/// \param Entity The name of the entity that involves the reference 1173/// type, if known. 1174/// 1175/// \returns A suitable reference type, if there are no 1176/// errors. Otherwise, returns a NULL type. 1177QualType Sema::BuildReferenceType(QualType T, bool SpelledAsLValue, 1178 SourceLocation Loc, 1179 DeclarationName Entity) { 1180 assert(Context.getCanonicalType(T) != Context.OverloadTy && 1181 "Unresolved overloaded function type"); 1182 1183 // C++0x [dcl.ref]p6: 1184 // If a typedef (7.1.3), a type template-parameter (14.3.1), or a 1185 // decltype-specifier (7.1.6.2) denotes a type TR that is a reference to a 1186 // type T, an attempt to create the type "lvalue reference to cv TR" creates 1187 // the type "lvalue reference to T", while an attempt to create the type 1188 // "rvalue reference to cv TR" creates the type TR. 1189 bool LValueRef = SpelledAsLValue || T->getAs<LValueReferenceType>(); 1190 1191 // C++ [dcl.ref]p4: There shall be no references to references. 1192 // 1193 // According to C++ DR 106, references to references are only 1194 // diagnosed when they are written directly (e.g., "int & &"), 1195 // but not when they happen via a typedef: 1196 // 1197 // typedef int& intref; 1198 // typedef intref& intref2; 1199 // 1200 // Parser::ParseDeclaratorInternal diagnoses the case where 1201 // references are written directly; here, we handle the 1202 // collapsing of references-to-references as described in C++0x. 1203 // DR 106 and 540 introduce reference-collapsing into C++98/03. 1204 1205 // C++ [dcl.ref]p1: 1206 // A declarator that specifies the type "reference to cv void" 1207 // is ill-formed. 1208 if (T->isVoidType()) { 1209 Diag(Loc, diag::err_reference_to_void); 1210 return QualType(); 1211 } 1212 1213 // In ARC, it is forbidden to build references to unqualified pointers. 1214 if (getLangOpts().ObjCAutoRefCount) 1215 T = inferARCLifetimeForPointee(*this, T, Loc, /*reference*/ true); 1216 1217 // Handle restrict on references. 1218 if (LValueRef) 1219 return Context.getLValueReferenceType(T, SpelledAsLValue); 1220 return Context.getRValueReferenceType(T); 1221} 1222 1223/// Check whether the specified array size makes the array type a VLA. If so, 1224/// return true, if not, return the size of the array in SizeVal. 1225static bool isArraySizeVLA(Sema &S, Expr *ArraySize, llvm::APSInt &SizeVal) { 1226 // If the size is an ICE, it certainly isn't a VLA. If we're in a GNU mode 1227 // (like gnu99, but not c99) accept any evaluatable value as an extension. 1228 class VLADiagnoser : public Sema::VerifyICEDiagnoser { 1229 public: 1230 VLADiagnoser() : Sema::VerifyICEDiagnoser(true) {} 1231 1232 virtual void diagnoseNotICE(Sema &S, SourceLocation Loc, SourceRange SR) { 1233 } 1234 1235 virtual void diagnoseFold(Sema &S, SourceLocation Loc, SourceRange SR) { 1236 S.Diag(Loc, diag::ext_vla_folded_to_constant) << SR; 1237 } 1238 } Diagnoser; 1239 1240 return S.VerifyIntegerConstantExpression(ArraySize, &SizeVal, Diagnoser, 1241 S.LangOpts.GNUMode).isInvalid(); 1242} 1243 1244 1245/// \brief Build an array type. 1246/// 1247/// \param T The type of each element in the array. 1248/// 1249/// \param ASM C99 array size modifier (e.g., '*', 'static'). 1250/// 1251/// \param ArraySize Expression describing the size of the array. 1252/// 1253/// \param Brackets The range from the opening '[' to the closing ']'. 1254/// 1255/// \param Entity The name of the entity that involves the array 1256/// type, if known. 1257/// 1258/// \returns A suitable array type, if there are no errors. Otherwise, 1259/// returns a NULL type. 1260QualType Sema::BuildArrayType(QualType T, ArrayType::ArraySizeModifier ASM, 1261 Expr *ArraySize, unsigned Quals, 1262 SourceRange Brackets, DeclarationName Entity) { 1263 1264 SourceLocation Loc = Brackets.getBegin(); 1265 if (getLangOpts().CPlusPlus) { 1266 // C++ [dcl.array]p1: 1267 // T is called the array element type; this type shall not be a reference 1268 // type, the (possibly cv-qualified) type void, a function type or an 1269 // abstract class type. 1270 // 1271 // C++ [dcl.array]p3: 1272 // When several "array of" specifications are adjacent, [...] only the 1273 // first of the constant expressions that specify the bounds of the arrays 1274 // may be omitted. 1275 // 1276 // Note: function types are handled in the common path with C. 1277 if (T->isReferenceType()) { 1278 Diag(Loc, diag::err_illegal_decl_array_of_references) 1279 << getPrintableNameForEntity(Entity) << T; 1280 return QualType(); 1281 } 1282 1283 if (T->isVoidType() || T->isIncompleteArrayType()) { 1284 Diag(Loc, diag::err_illegal_decl_array_incomplete_type) << T; 1285 return QualType(); 1286 } 1287 1288 if (RequireNonAbstractType(Brackets.getBegin(), T, 1289 diag::err_array_of_abstract_type)) 1290 return QualType(); 1291 1292 } else { 1293 // C99 6.7.5.2p1: If the element type is an incomplete or function type, 1294 // reject it (e.g. void ary[7], struct foo ary[7], void ary[7]()) 1295 if (RequireCompleteType(Loc, T, 1296 diag::err_illegal_decl_array_incomplete_type)) 1297 return QualType(); 1298 } 1299 1300 if (T->isFunctionType()) { 1301 Diag(Loc, diag::err_illegal_decl_array_of_functions) 1302 << getPrintableNameForEntity(Entity) << T; 1303 return QualType(); 1304 } 1305 1306 if (T->getContainedAutoType()) { 1307 Diag(Loc, diag::err_illegal_decl_array_of_auto) 1308 << getPrintableNameForEntity(Entity) << T; 1309 return QualType(); 1310 } 1311 1312 if (const RecordType *EltTy = T->getAs<RecordType>()) { 1313 // If the element type is a struct or union that contains a variadic 1314 // array, accept it as a GNU extension: C99 6.7.2.1p2. 1315 if (EltTy->getDecl()->hasFlexibleArrayMember()) 1316 Diag(Loc, diag::ext_flexible_array_in_array) << T; 1317 } else if (T->isObjCObjectType()) { 1318 Diag(Loc, diag::err_objc_array_of_interfaces) << T; 1319 return QualType(); 1320 } 1321 1322 // Do placeholder conversions on the array size expression. 1323 if (ArraySize && ArraySize->hasPlaceholderType()) { 1324 ExprResult Result = CheckPlaceholderExpr(ArraySize); 1325 if (Result.isInvalid()) return QualType(); 1326 ArraySize = Result.take(); 1327 } 1328 1329 // Do lvalue-to-rvalue conversions on the array size expression. 1330 if (ArraySize && !ArraySize->isRValue()) { 1331 ExprResult Result = DefaultLvalueConversion(ArraySize); 1332 if (Result.isInvalid()) 1333 return QualType(); 1334 1335 ArraySize = Result.take(); 1336 } 1337 1338 // C99 6.7.5.2p1: The size expression shall have integer type. 1339 // C++11 allows contextual conversions to such types. 1340 if (!getLangOpts().CPlusPlus0x && 1341 ArraySize && !ArraySize->isTypeDependent() && 1342 !ArraySize->getType()->isIntegralOrUnscopedEnumerationType()) { 1343 Diag(ArraySize->getLocStart(), diag::err_array_size_non_int) 1344 << ArraySize->getType() << ArraySize->getSourceRange(); 1345 return QualType(); 1346 } 1347 1348 llvm::APSInt ConstVal(Context.getTypeSize(Context.getSizeType())); 1349 if (!ArraySize) { 1350 if (ASM == ArrayType::Star) 1351 T = Context.getVariableArrayType(T, 0, ASM, Quals, Brackets); 1352 else 1353 T = Context.getIncompleteArrayType(T, ASM, Quals); 1354 } else if (ArraySize->isTypeDependent() || ArraySize->isValueDependent()) { 1355 T = Context.getDependentSizedArrayType(T, ArraySize, ASM, Quals, Brackets); 1356 } else if ((!T->isDependentType() && !T->isIncompleteType() && 1357 !T->isConstantSizeType()) || 1358 isArraySizeVLA(*this, ArraySize, ConstVal)) { 1359 // Even in C++11, don't allow contextual conversions in the array bound 1360 // of a VLA. 1361 if (getLangOpts().CPlusPlus0x && 1362 !ArraySize->getType()->isIntegralOrUnscopedEnumerationType()) { 1363 Diag(ArraySize->getLocStart(), diag::err_array_size_non_int) 1364 << ArraySize->getType() << ArraySize->getSourceRange(); 1365 return QualType(); 1366 } 1367 1368 // C99: an array with an element type that has a non-constant-size is a VLA. 1369 // C99: an array with a non-ICE size is a VLA. We accept any expression 1370 // that we can fold to a non-zero positive value as an extension. 1371 T = Context.getVariableArrayType(T, ArraySize, ASM, Quals, Brackets); 1372 } else { 1373 // C99 6.7.5.2p1: If the expression is a constant expression, it shall 1374 // have a value greater than zero. 1375 if (ConstVal.isSigned() && ConstVal.isNegative()) { 1376 if (Entity) 1377 Diag(ArraySize->getLocStart(), diag::err_decl_negative_array_size) 1378 << getPrintableNameForEntity(Entity) << ArraySize->getSourceRange(); 1379 else 1380 Diag(ArraySize->getLocStart(), diag::err_typecheck_negative_array_size) 1381 << ArraySize->getSourceRange(); 1382 return QualType(); 1383 } 1384 if (ConstVal == 0) { 1385 // GCC accepts zero sized static arrays. We allow them when 1386 // we're not in a SFINAE context. 1387 Diag(ArraySize->getLocStart(), 1388 isSFINAEContext()? diag::err_typecheck_zero_array_size 1389 : diag::ext_typecheck_zero_array_size) 1390 << ArraySize->getSourceRange(); 1391 1392 if (ASM == ArrayType::Static) { 1393 Diag(ArraySize->getLocStart(), 1394 diag::warn_typecheck_zero_static_array_size) 1395 << ArraySize->getSourceRange(); 1396 ASM = ArrayType::Normal; 1397 } 1398 } else if (!T->isDependentType() && !T->isVariablyModifiedType() && 1399 !T->isIncompleteType()) { 1400 // Is the array too large? 1401 unsigned ActiveSizeBits 1402 = ConstantArrayType::getNumAddressingBits(Context, T, ConstVal); 1403 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) 1404 Diag(ArraySize->getLocStart(), diag::err_array_too_large) 1405 << ConstVal.toString(10) 1406 << ArraySize->getSourceRange(); 1407 } 1408 1409 T = Context.getConstantArrayType(T, ConstVal, ASM, Quals); 1410 } 1411 // If this is not C99, extwarn about VLA's and C99 array size modifiers. 1412 if (!getLangOpts().C99) { 1413 if (T->isVariableArrayType()) { 1414 // Prohibit the use of non-POD types in VLAs. 1415 QualType BaseT = Context.getBaseElementType(T); 1416 if (!T->isDependentType() && 1417 !BaseT.isPODType(Context) && 1418 !BaseT->isObjCLifetimeType()) { 1419 Diag(Loc, diag::err_vla_non_pod) 1420 << BaseT; 1421 return QualType(); 1422 } 1423 // Prohibit the use of VLAs during template argument deduction. 1424 else if (isSFINAEContext()) { 1425 Diag(Loc, diag::err_vla_in_sfinae); 1426 return QualType(); 1427 } 1428 // Just extwarn about VLAs. 1429 else 1430 Diag(Loc, diag::ext_vla); 1431 } else if (ASM != ArrayType::Normal || Quals != 0) 1432 Diag(Loc, 1433 getLangOpts().CPlusPlus? diag::err_c99_array_usage_cxx 1434 : diag::ext_c99_array_usage) << ASM; 1435 } 1436 1437 return T; 1438} 1439 1440/// \brief Build an ext-vector type. 1441/// 1442/// Run the required checks for the extended vector type. 1443QualType Sema::BuildExtVectorType(QualType T, Expr *ArraySize, 1444 SourceLocation AttrLoc) { 1445 // unlike gcc's vector_size attribute, we do not allow vectors to be defined 1446 // in conjunction with complex types (pointers, arrays, functions, etc.). 1447 if (!T->isDependentType() && 1448 !T->isIntegerType() && !T->isRealFloatingType()) { 1449 Diag(AttrLoc, diag::err_attribute_invalid_vector_type) << T; 1450 return QualType(); 1451 } 1452 1453 if (!ArraySize->isTypeDependent() && !ArraySize->isValueDependent()) { 1454 llvm::APSInt vecSize(32); 1455 if (!ArraySize->isIntegerConstantExpr(vecSize, Context)) { 1456 Diag(AttrLoc, diag::err_attribute_argument_not_int) 1457 << "ext_vector_type" << ArraySize->getSourceRange(); 1458 return QualType(); 1459 } 1460 1461 // unlike gcc's vector_size attribute, the size is specified as the 1462 // number of elements, not the number of bytes. 1463 unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue()); 1464 1465 if (vectorSize == 0) { 1466 Diag(AttrLoc, diag::err_attribute_zero_size) 1467 << ArraySize->getSourceRange(); 1468 return QualType(); 1469 } 1470 1471 return Context.getExtVectorType(T, vectorSize); 1472 } 1473 1474 return Context.getDependentSizedExtVectorType(T, ArraySize, AttrLoc); 1475} 1476 1477/// \brief Build a function type. 1478/// 1479/// This routine checks the function type according to C++ rules and 1480/// under the assumption that the result type and parameter types have 1481/// just been instantiated from a template. It therefore duplicates 1482/// some of the behavior of GetTypeForDeclarator, but in a much 1483/// simpler form that is only suitable for this narrow use case. 1484/// 1485/// \param T The return type of the function. 1486/// 1487/// \param ParamTypes The parameter types of the function. This array 1488/// will be modified to account for adjustments to the types of the 1489/// function parameters. 1490/// 1491/// \param NumParamTypes The number of parameter types in ParamTypes. 1492/// 1493/// \param Variadic Whether this is a variadic function type. 1494/// 1495/// \param HasTrailingReturn Whether this function has a trailing return type. 1496/// 1497/// \param Quals The cvr-qualifiers to be applied to the function type. 1498/// 1499/// \param Loc The location of the entity whose type involves this 1500/// function type or, if there is no such entity, the location of the 1501/// type that will have function type. 1502/// 1503/// \param Entity The name of the entity that involves the function 1504/// type, if known. 1505/// 1506/// \returns A suitable function type, if there are no 1507/// errors. Otherwise, returns a NULL type. 1508QualType Sema::BuildFunctionType(QualType T, 1509 QualType *ParamTypes, 1510 unsigned NumParamTypes, 1511 bool Variadic, bool HasTrailingReturn, 1512 unsigned Quals, 1513 RefQualifierKind RefQualifier, 1514 SourceLocation Loc, DeclarationName Entity, 1515 FunctionType::ExtInfo Info) { 1516 if (T->isArrayType() || T->isFunctionType()) { 1517 Diag(Loc, diag::err_func_returning_array_function) 1518 << T->isFunctionType() << T; 1519 return QualType(); 1520 } 1521 1522 // Functions cannot return half FP. 1523 if (T->isHalfType()) { 1524 Diag(Loc, diag::err_parameters_retval_cannot_have_fp16_type) << 1 << 1525 FixItHint::CreateInsertion(Loc, "*"); 1526 return QualType(); 1527 } 1528 1529 bool Invalid = false; 1530 for (unsigned Idx = 0; Idx < NumParamTypes; ++Idx) { 1531 // FIXME: Loc is too inprecise here, should use proper locations for args. 1532 QualType ParamType = Context.getAdjustedParameterType(ParamTypes[Idx]); 1533 if (ParamType->isVoidType()) { 1534 Diag(Loc, diag::err_param_with_void_type); 1535 Invalid = true; 1536 } else if (ParamType->isHalfType()) { 1537 // Disallow half FP arguments. 1538 Diag(Loc, diag::err_parameters_retval_cannot_have_fp16_type) << 0 << 1539 FixItHint::CreateInsertion(Loc, "*"); 1540 Invalid = true; 1541 } 1542 1543 ParamTypes[Idx] = ParamType; 1544 } 1545 1546 if (Invalid) 1547 return QualType(); 1548 1549 FunctionProtoType::ExtProtoInfo EPI; 1550 EPI.Variadic = Variadic; 1551 EPI.HasTrailingReturn = HasTrailingReturn; 1552 EPI.TypeQuals = Quals; 1553 EPI.RefQualifier = RefQualifier; 1554 EPI.ExtInfo = Info; 1555 1556 return Context.getFunctionType(T, ParamTypes, NumParamTypes, EPI); 1557} 1558 1559/// \brief Build a member pointer type \c T Class::*. 1560/// 1561/// \param T the type to which the member pointer refers. 1562/// \param Class the class type into which the member pointer points. 1563/// \param Loc the location where this type begins 1564/// \param Entity the name of the entity that will have this member pointer type 1565/// 1566/// \returns a member pointer type, if successful, or a NULL type if there was 1567/// an error. 1568QualType Sema::BuildMemberPointerType(QualType T, QualType Class, 1569 SourceLocation Loc, 1570 DeclarationName Entity) { 1571 // Verify that we're not building a pointer to pointer to function with 1572 // exception specification. 1573 if (CheckDistantExceptionSpec(T)) { 1574 Diag(Loc, diag::err_distant_exception_spec); 1575 1576 // FIXME: If we're doing this as part of template instantiation, 1577 // we should return immediately. 1578 1579 // Build the type anyway, but use the canonical type so that the 1580 // exception specifiers are stripped off. 1581 T = Context.getCanonicalType(T); 1582 } 1583 1584 // C++ 8.3.3p3: A pointer to member shall not point to ... a member 1585 // with reference type, or "cv void." 1586 if (T->isReferenceType()) { 1587 Diag(Loc, diag::err_illegal_decl_mempointer_to_reference) 1588 << (Entity? Entity.getAsString() : "type name") << T; 1589 return QualType(); 1590 } 1591 1592 if (T->isVoidType()) { 1593 Diag(Loc, diag::err_illegal_decl_mempointer_to_void) 1594 << (Entity? Entity.getAsString() : "type name"); 1595 return QualType(); 1596 } 1597 1598 if (!Class->isDependentType() && !Class->isRecordType()) { 1599 Diag(Loc, diag::err_mempointer_in_nonclass_type) << Class; 1600 return QualType(); 1601 } 1602 1603 // In the Microsoft ABI, the class is allowed to be an incomplete 1604 // type. In such cases, the compiler makes a worst-case assumption. 1605 // We make no such assumption right now, so emit an error if the 1606 // class isn't a complete type. 1607 if (Context.getTargetInfo().getCXXABI() == CXXABI_Microsoft && 1608 RequireCompleteType(Loc, Class, diag::err_incomplete_type)) 1609 return QualType(); 1610 1611 return Context.getMemberPointerType(T, Class.getTypePtr()); 1612} 1613 1614/// \brief Build a block pointer type. 1615/// 1616/// \param T The type to which we'll be building a block pointer. 1617/// 1618/// \param Loc The source location, used for diagnostics. 1619/// 1620/// \param Entity The name of the entity that involves the block pointer 1621/// type, if known. 1622/// 1623/// \returns A suitable block pointer type, if there are no 1624/// errors. Otherwise, returns a NULL type. 1625QualType Sema::BuildBlockPointerType(QualType T, 1626 SourceLocation Loc, 1627 DeclarationName Entity) { 1628 if (!T->isFunctionType()) { 1629 Diag(Loc, diag::err_nonfunction_block_type); 1630 return QualType(); 1631 } 1632 1633 return Context.getBlockPointerType(T); 1634} 1635 1636QualType Sema::GetTypeFromParser(ParsedType Ty, TypeSourceInfo **TInfo) { 1637 QualType QT = Ty.get(); 1638 if (QT.isNull()) { 1639 if (TInfo) *TInfo = 0; 1640 return QualType(); 1641 } 1642 1643 TypeSourceInfo *DI = 0; 1644 if (const LocInfoType *LIT = dyn_cast<LocInfoType>(QT)) { 1645 QT = LIT->getType(); 1646 DI = LIT->getTypeSourceInfo(); 1647 } 1648 1649 if (TInfo) *TInfo = DI; 1650 return QT; 1651} 1652 1653static void transferARCOwnershipToDeclaratorChunk(TypeProcessingState &state, 1654 Qualifiers::ObjCLifetime ownership, 1655 unsigned chunkIndex); 1656 1657/// Given that this is the declaration of a parameter under ARC, 1658/// attempt to infer attributes and such for pointer-to-whatever 1659/// types. 1660static void inferARCWriteback(TypeProcessingState &state, 1661 QualType &declSpecType) { 1662 Sema &S = state.getSema(); 1663 Declarator &declarator = state.getDeclarator(); 1664 1665 // TODO: should we care about decl qualifiers? 1666 1667 // Check whether the declarator has the expected form. We walk 1668 // from the inside out in order to make the block logic work. 1669 unsigned outermostPointerIndex = 0; 1670 bool isBlockPointer = false; 1671 unsigned numPointers = 0; 1672 for (unsigned i = 0, e = declarator.getNumTypeObjects(); i != e; ++i) { 1673 unsigned chunkIndex = i; 1674 DeclaratorChunk &chunk = declarator.getTypeObject(chunkIndex); 1675 switch (chunk.Kind) { 1676 case DeclaratorChunk::Paren: 1677 // Ignore parens. 1678 break; 1679 1680 case DeclaratorChunk::Reference: 1681 case DeclaratorChunk::Pointer: 1682 // Count the number of pointers. Treat references 1683 // interchangeably as pointers; if they're mis-ordered, normal 1684 // type building will discover that. 1685 outermostPointerIndex = chunkIndex; 1686 numPointers++; 1687 break; 1688 1689 case DeclaratorChunk::BlockPointer: 1690 // If we have a pointer to block pointer, that's an acceptable 1691 // indirect reference; anything else is not an application of 1692 // the rules. 1693 if (numPointers != 1) return; 1694 numPointers++; 1695 outermostPointerIndex = chunkIndex; 1696 isBlockPointer = true; 1697 1698 // We don't care about pointer structure in return values here. 1699 goto done; 1700 1701 case DeclaratorChunk::Array: // suppress if written (id[])? 1702 case DeclaratorChunk::Function: 1703 case DeclaratorChunk::MemberPointer: 1704 return; 1705 } 1706 } 1707 done: 1708 1709 // If we have *one* pointer, then we want to throw the qualifier on 1710 // the declaration-specifiers, which means that it needs to be a 1711 // retainable object type. 1712 if (numPointers == 1) { 1713 // If it's not a retainable object type, the rule doesn't apply. 1714 if (!declSpecType->isObjCRetainableType()) return; 1715 1716 // If it already has lifetime, don't do anything. 1717 if (declSpecType.getObjCLifetime()) return; 1718 1719 // Otherwise, modify the type in-place. 1720 Qualifiers qs; 1721 1722 if (declSpecType->isObjCARCImplicitlyUnretainedType()) 1723 qs.addObjCLifetime(Qualifiers::OCL_ExplicitNone); 1724 else 1725 qs.addObjCLifetime(Qualifiers::OCL_Autoreleasing); 1726 declSpecType = S.Context.getQualifiedType(declSpecType, qs); 1727 1728 // If we have *two* pointers, then we want to throw the qualifier on 1729 // the outermost pointer. 1730 } else if (numPointers == 2) { 1731 // If we don't have a block pointer, we need to check whether the 1732 // declaration-specifiers gave us something that will turn into a 1733 // retainable object pointer after we slap the first pointer on it. 1734 if (!isBlockPointer && !declSpecType->isObjCObjectType()) 1735 return; 1736 1737 // Look for an explicit lifetime attribute there. 1738 DeclaratorChunk &chunk = declarator.getTypeObject(outermostPointerIndex); 1739 if (chunk.Kind != DeclaratorChunk::Pointer && 1740 chunk.Kind != DeclaratorChunk::BlockPointer) 1741 return; 1742 for (const AttributeList *attr = chunk.getAttrs(); attr; 1743 attr = attr->getNext()) 1744 if (attr->getKind() == AttributeList::AT_ObjCOwnership) 1745 return; 1746 1747 transferARCOwnershipToDeclaratorChunk(state, Qualifiers::OCL_Autoreleasing, 1748 outermostPointerIndex); 1749 1750 // Any other number of pointers/references does not trigger the rule. 1751 } else return; 1752 1753 // TODO: mark whether we did this inference? 1754} 1755 1756static void DiagnoseIgnoredQualifiers(unsigned Quals, 1757 SourceLocation ConstQualLoc, 1758 SourceLocation VolatileQualLoc, 1759 SourceLocation RestrictQualLoc, 1760 Sema& S) { 1761 std::string QualStr; 1762 unsigned NumQuals = 0; 1763 SourceLocation Loc; 1764 1765 FixItHint ConstFixIt; 1766 FixItHint VolatileFixIt; 1767 FixItHint RestrictFixIt; 1768 1769 const SourceManager &SM = S.getSourceManager(); 1770 1771 // FIXME: The locations here are set kind of arbitrarily. It'd be nicer to 1772 // find a range and grow it to encompass all the qualifiers, regardless of 1773 // the order in which they textually appear. 1774 if (Quals & Qualifiers::Const) { 1775 ConstFixIt = FixItHint::CreateRemoval(ConstQualLoc); 1776 QualStr = "const"; 1777 ++NumQuals; 1778 if (!Loc.isValid() || SM.isBeforeInTranslationUnit(ConstQualLoc, Loc)) 1779 Loc = ConstQualLoc; 1780 } 1781 if (Quals & Qualifiers::Volatile) { 1782 VolatileFixIt = FixItHint::CreateRemoval(VolatileQualLoc); 1783 QualStr += (NumQuals == 0 ? "volatile" : " volatile"); 1784 ++NumQuals; 1785 if (!Loc.isValid() || SM.isBeforeInTranslationUnit(VolatileQualLoc, Loc)) 1786 Loc = VolatileQualLoc; 1787 } 1788 if (Quals & Qualifiers::Restrict) { 1789 RestrictFixIt = FixItHint::CreateRemoval(RestrictQualLoc); 1790 QualStr += (NumQuals == 0 ? "restrict" : " restrict"); 1791 ++NumQuals; 1792 if (!Loc.isValid() || SM.isBeforeInTranslationUnit(RestrictQualLoc, Loc)) 1793 Loc = RestrictQualLoc; 1794 } 1795 1796 assert(NumQuals > 0 && "No known qualifiers?"); 1797 1798 S.Diag(Loc, diag::warn_qual_return_type) 1799 << QualStr << NumQuals << ConstFixIt << VolatileFixIt << RestrictFixIt; 1800} 1801 1802static QualType GetDeclSpecTypeForDeclarator(TypeProcessingState &state, 1803 TypeSourceInfo *&ReturnTypeInfo) { 1804 Sema &SemaRef = state.getSema(); 1805 Declarator &D = state.getDeclarator(); 1806 QualType T; 1807 ReturnTypeInfo = 0; 1808 1809 // The TagDecl owned by the DeclSpec. 1810 TagDecl *OwnedTagDecl = 0; 1811 1812 switch (D.getName().getKind()) { 1813 case UnqualifiedId::IK_ImplicitSelfParam: 1814 case UnqualifiedId::IK_OperatorFunctionId: 1815 case UnqualifiedId::IK_Identifier: 1816 case UnqualifiedId::IK_LiteralOperatorId: 1817 case UnqualifiedId::IK_TemplateId: 1818 T = ConvertDeclSpecToType(state); 1819 1820 if (!D.isInvalidType() && D.getDeclSpec().isTypeSpecOwned()) { 1821 OwnedTagDecl = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 1822 // Owned declaration is embedded in declarator. 1823 OwnedTagDecl->setEmbeddedInDeclarator(true); 1824 } 1825 break; 1826 1827 case UnqualifiedId::IK_ConstructorName: 1828 case UnqualifiedId::IK_ConstructorTemplateId: 1829 case UnqualifiedId::IK_DestructorName: 1830 // Constructors and destructors don't have return types. Use 1831 // "void" instead. 1832 T = SemaRef.Context.VoidTy; 1833 if (AttributeList *attrs = D.getDeclSpec().getAttributes().getList()) 1834 processTypeAttrs(state, T, true, attrs); 1835 break; 1836 1837 case UnqualifiedId::IK_ConversionFunctionId: 1838 // The result type of a conversion function is the type that it 1839 // converts to. 1840 T = SemaRef.GetTypeFromParser(D.getName().ConversionFunctionId, 1841 &ReturnTypeInfo); 1842 break; 1843 } 1844 1845 if (D.getAttributes()) 1846 distributeTypeAttrsFromDeclarator(state, T); 1847 1848 // C++11 [dcl.spec.auto]p5: reject 'auto' if it is not in an allowed context. 1849 // In C++11, a function declarator using 'auto' must have a trailing return 1850 // type (this is checked later) and we can skip this. In other languages 1851 // using auto, we need to check regardless. 1852 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto && 1853 (!SemaRef.getLangOpts().CPlusPlus0x || !D.isFunctionDeclarator())) { 1854 int Error = -1; 1855 1856 switch (D.getContext()) { 1857 case Declarator::KNRTypeListContext: 1858 llvm_unreachable("K&R type lists aren't allowed in C++"); 1859 case Declarator::LambdaExprContext: 1860 llvm_unreachable("Can't specify a type specifier in lambda grammar"); 1861 case Declarator::ObjCParameterContext: 1862 case Declarator::ObjCResultContext: 1863 case Declarator::PrototypeContext: 1864 Error = 0; // Function prototype 1865 break; 1866 case Declarator::MemberContext: 1867 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_static) 1868 break; 1869 switch (cast<TagDecl>(SemaRef.CurContext)->getTagKind()) { 1870 case TTK_Enum: llvm_unreachable("unhandled tag kind"); 1871 case TTK_Struct: Error = 1; /* Struct member */ break; 1872 case TTK_Union: Error = 2; /* Union member */ break; 1873 case TTK_Class: Error = 3; /* Class member */ break; 1874 case TTK_Interface: Error = 4; /* Interface member */ break; 1875 } 1876 break; 1877 case Declarator::CXXCatchContext: 1878 case Declarator::ObjCCatchContext: 1879 Error = 5; // Exception declaration 1880 break; 1881 case Declarator::TemplateParamContext: 1882 Error = 6; // Template parameter 1883 break; 1884 case Declarator::BlockLiteralContext: 1885 Error = 7; // Block literal 1886 break; 1887 case Declarator::TemplateTypeArgContext: 1888 Error = 8; // Template type argument 1889 break; 1890 case Declarator::AliasDeclContext: 1891 case Declarator::AliasTemplateContext: 1892 Error = 10; // Type alias 1893 break; 1894 case Declarator::TrailingReturnContext: 1895 Error = 11; // Function return type 1896 break; 1897 case Declarator::TypeNameContext: 1898 Error = 12; // Generic 1899 break; 1900 case Declarator::FileContext: 1901 case Declarator::BlockContext: 1902 case Declarator::ForContext: 1903 case Declarator::ConditionContext: 1904 case Declarator::CXXNewContext: 1905 break; 1906 } 1907 1908 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 1909 Error = 9; 1910 1911 // In Objective-C it is an error to use 'auto' on a function declarator. 1912 if (D.isFunctionDeclarator()) 1913 Error = 11; 1914 1915 // C++11 [dcl.spec.auto]p2: 'auto' is always fine if the declarator 1916 // contains a trailing return type. That is only legal at the outermost 1917 // level. Check all declarator chunks (outermost first) anyway, to give 1918 // better diagnostics. 1919 if (SemaRef.getLangOpts().CPlusPlus0x && Error != -1) { 1920 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 1921 unsigned chunkIndex = e - i - 1; 1922 state.setCurrentChunkIndex(chunkIndex); 1923 DeclaratorChunk &DeclType = D.getTypeObject(chunkIndex); 1924 if (DeclType.Kind == DeclaratorChunk::Function) { 1925 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun; 1926 if (FTI.hasTrailingReturnType()) { 1927 Error = -1; 1928 break; 1929 } 1930 } 1931 } 1932 } 1933 1934 if (Error != -1) { 1935 SemaRef.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 1936 diag::err_auto_not_allowed) 1937 << Error; 1938 T = SemaRef.Context.IntTy; 1939 D.setInvalidType(true); 1940 } else 1941 SemaRef.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 1942 diag::warn_cxx98_compat_auto_type_specifier); 1943 } 1944 1945 if (SemaRef.getLangOpts().CPlusPlus && 1946 OwnedTagDecl && OwnedTagDecl->isCompleteDefinition()) { 1947 // Check the contexts where C++ forbids the declaration of a new class 1948 // or enumeration in a type-specifier-seq. 1949 switch (D.getContext()) { 1950 case Declarator::TrailingReturnContext: 1951 // Class and enumeration definitions are syntactically not allowed in 1952 // trailing return types. 1953 llvm_unreachable("parser should not have allowed this"); 1954 break; 1955 case Declarator::FileContext: 1956 case Declarator::MemberContext: 1957 case Declarator::BlockContext: 1958 case Declarator::ForContext: 1959 case Declarator::BlockLiteralContext: 1960 case Declarator::LambdaExprContext: 1961 // C++11 [dcl.type]p3: 1962 // A type-specifier-seq shall not define a class or enumeration unless 1963 // it appears in the type-id of an alias-declaration (7.1.3) that is not 1964 // the declaration of a template-declaration. 1965 case Declarator::AliasDeclContext: 1966 break; 1967 case Declarator::AliasTemplateContext: 1968 SemaRef.Diag(OwnedTagDecl->getLocation(), 1969 diag::err_type_defined_in_alias_template) 1970 << SemaRef.Context.getTypeDeclType(OwnedTagDecl); 1971 break; 1972 case Declarator::TypeNameContext: 1973 case Declarator::TemplateParamContext: 1974 case Declarator::CXXNewContext: 1975 case Declarator::CXXCatchContext: 1976 case Declarator::ObjCCatchContext: 1977 case Declarator::TemplateTypeArgContext: 1978 SemaRef.Diag(OwnedTagDecl->getLocation(), 1979 diag::err_type_defined_in_type_specifier) 1980 << SemaRef.Context.getTypeDeclType(OwnedTagDecl); 1981 break; 1982 case Declarator::PrototypeContext: 1983 case Declarator::ObjCParameterContext: 1984 case Declarator::ObjCResultContext: 1985 case Declarator::KNRTypeListContext: 1986 // C++ [dcl.fct]p6: 1987 // Types shall not be defined in return or parameter types. 1988 SemaRef.Diag(OwnedTagDecl->getLocation(), 1989 diag::err_type_defined_in_param_type) 1990 << SemaRef.Context.getTypeDeclType(OwnedTagDecl); 1991 break; 1992 case Declarator::ConditionContext: 1993 // C++ 6.4p2: 1994 // The type-specifier-seq shall not contain typedef and shall not declare 1995 // a new class or enumeration. 1996 SemaRef.Diag(OwnedTagDecl->getLocation(), 1997 diag::err_type_defined_in_condition); 1998 break; 1999 } 2000 } 2001 2002 return T; 2003} 2004 2005static std::string getFunctionQualifiersAsString(const FunctionProtoType *FnTy){ 2006 std::string Quals = 2007 Qualifiers::fromCVRMask(FnTy->getTypeQuals()).getAsString(); 2008 2009 switch (FnTy->getRefQualifier()) { 2010 case RQ_None: 2011 break; 2012 2013 case RQ_LValue: 2014 if (!Quals.empty()) 2015 Quals += ' '; 2016 Quals += '&'; 2017 break; 2018 2019 case RQ_RValue: 2020 if (!Quals.empty()) 2021 Quals += ' '; 2022 Quals += "&&"; 2023 break; 2024 } 2025 2026 return Quals; 2027} 2028 2029/// Check that the function type T, which has a cv-qualifier or a ref-qualifier, 2030/// can be contained within the declarator chunk DeclType, and produce an 2031/// appropriate diagnostic if not. 2032static void checkQualifiedFunction(Sema &S, QualType T, 2033 DeclaratorChunk &DeclType) { 2034 // C++98 [dcl.fct]p4 / C++11 [dcl.fct]p6: a function type with a 2035 // cv-qualifier or a ref-qualifier can only appear at the topmost level 2036 // of a type. 2037 int DiagKind = -1; 2038 switch (DeclType.Kind) { 2039 case DeclaratorChunk::Paren: 2040 case DeclaratorChunk::MemberPointer: 2041 // These cases are permitted. 2042 return; 2043 case DeclaratorChunk::Array: 2044 case DeclaratorChunk::Function: 2045 // These cases don't allow function types at all; no need to diagnose the 2046 // qualifiers separately. 2047 return; 2048 case DeclaratorChunk::BlockPointer: 2049 DiagKind = 0; 2050 break; 2051 case DeclaratorChunk::Pointer: 2052 DiagKind = 1; 2053 break; 2054 case DeclaratorChunk::Reference: 2055 DiagKind = 2; 2056 break; 2057 } 2058 2059 assert(DiagKind != -1); 2060 S.Diag(DeclType.Loc, diag::err_compound_qualified_function_type) 2061 << DiagKind << isa<FunctionType>(T.IgnoreParens()) << T 2062 << getFunctionQualifiersAsString(T->castAs<FunctionProtoType>()); 2063} 2064 2065/// Produce an approprioate diagnostic for an ambiguity between a function 2066/// declarator and a C++ direct-initializer. 2067static void warnAboutAmbiguousFunction(Sema &S, Declarator &D, 2068 DeclaratorChunk &DeclType, QualType RT) { 2069 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun; 2070 assert(FTI.isAmbiguous && "no direct-initializer / function ambiguity"); 2071 2072 // If the return type is void there is no ambiguity. 2073 if (RT->isVoidType()) 2074 return; 2075 2076 // An initializer for a non-class type can have at most one argument. 2077 if (!RT->isRecordType() && FTI.NumArgs > 1) 2078 return; 2079 2080 // An initializer for a reference must have exactly one argument. 2081 if (RT->isReferenceType() && FTI.NumArgs != 1) 2082 return; 2083 2084 // Only warn if this declarator is declaring a function at block scope, and 2085 // doesn't have a storage class (such as 'extern') specified. 2086 if (!D.isFunctionDeclarator() || 2087 D.getFunctionDefinitionKind() != FDK_Declaration || 2088 !S.CurContext->isFunctionOrMethod() || 2089 D.getDeclSpec().getStorageClassSpecAsWritten() 2090 != DeclSpec::SCS_unspecified) 2091 return; 2092 2093 // Inside a condition, a direct initializer is not permitted. We allow one to 2094 // be parsed in order to give better diagnostics in condition parsing. 2095 if (D.getContext() == Declarator::ConditionContext) 2096 return; 2097 2098 SourceRange ParenRange(DeclType.Loc, DeclType.EndLoc); 2099 2100 S.Diag(DeclType.Loc, 2101 FTI.NumArgs ? diag::warn_parens_disambiguated_as_function_declaration 2102 : diag::warn_empty_parens_are_function_decl) 2103 << ParenRange; 2104 2105 // If the declaration looks like: 2106 // T var1, 2107 // f(); 2108 // and name lookup finds a function named 'f', then the ',' was 2109 // probably intended to be a ';'. 2110 if (!D.isFirstDeclarator() && D.getIdentifier()) { 2111 FullSourceLoc Comma(D.getCommaLoc(), S.SourceMgr); 2112 FullSourceLoc Name(D.getIdentifierLoc(), S.SourceMgr); 2113 if (Comma.getFileID() != Name.getFileID() || 2114 Comma.getSpellingLineNumber() != Name.getSpellingLineNumber()) { 2115 LookupResult Result(S, D.getIdentifier(), SourceLocation(), 2116 Sema::LookupOrdinaryName); 2117 if (S.LookupName(Result, S.getCurScope())) 2118 S.Diag(D.getCommaLoc(), diag::note_empty_parens_function_call) 2119 << FixItHint::CreateReplacement(D.getCommaLoc(), ";") 2120 << D.getIdentifier(); 2121 } 2122 } 2123 2124 if (FTI.NumArgs > 0) { 2125 // For a declaration with parameters, eg. "T var(T());", suggest adding parens 2126 // around the first parameter to turn the declaration into a variable 2127 // declaration. 2128 SourceRange Range = FTI.ArgInfo[0].Param->getSourceRange(); 2129 SourceLocation B = Range.getBegin(); 2130 SourceLocation E = S.PP.getLocForEndOfToken(Range.getEnd()); 2131 // FIXME: Maybe we should suggest adding braces instead of parens 2132 // in C++11 for classes that don't have an initializer_list constructor. 2133 S.Diag(B, diag::note_additional_parens_for_variable_declaration) 2134 << FixItHint::CreateInsertion(B, "(") 2135 << FixItHint::CreateInsertion(E, ")"); 2136 } else { 2137 // For a declaration without parameters, eg. "T var();", suggest replacing the 2138 // parens with an initializer to turn the declaration into a variable 2139 // declaration. 2140 const CXXRecordDecl *RD = RT->getAsCXXRecordDecl(); 2141 2142 // Empty parens mean value-initialization, and no parens mean 2143 // default initialization. These are equivalent if the default 2144 // constructor is user-provided or if zero-initialization is a 2145 // no-op. 2146 if (RD && RD->hasDefinition() && 2147 (RD->isEmpty() || RD->hasUserProvidedDefaultConstructor())) 2148 S.Diag(DeclType.Loc, diag::note_empty_parens_default_ctor) 2149 << FixItHint::CreateRemoval(ParenRange); 2150 else { 2151 std::string Init = S.getFixItZeroInitializerForType(RT); 2152 if (Init.empty() && S.LangOpts.CPlusPlus0x) 2153 Init = "{}"; 2154 if (!Init.empty()) 2155 S.Diag(DeclType.Loc, diag::note_empty_parens_zero_initialize) 2156 << FixItHint::CreateReplacement(ParenRange, Init); 2157 } 2158 } 2159} 2160 2161static TypeSourceInfo *GetFullTypeForDeclarator(TypeProcessingState &state, 2162 QualType declSpecType, 2163 TypeSourceInfo *TInfo) { 2164 2165 QualType T = declSpecType; 2166 Declarator &D = state.getDeclarator(); 2167 Sema &S = state.getSema(); 2168 ASTContext &Context = S.Context; 2169 const LangOptions &LangOpts = S.getLangOpts(); 2170 2171 bool ImplicitlyNoexcept = false; 2172 if (D.getName().getKind() == UnqualifiedId::IK_OperatorFunctionId && 2173 LangOpts.CPlusPlus0x) { 2174 OverloadedOperatorKind OO = D.getName().OperatorFunctionId.Operator; 2175 /// In C++0x, deallocation functions (normal and array operator delete) 2176 /// are implicitly noexcept. 2177 if (OO == OO_Delete || OO == OO_Array_Delete) 2178 ImplicitlyNoexcept = true; 2179 } 2180 2181 // The name we're declaring, if any. 2182 DeclarationName Name; 2183 if (D.getIdentifier()) 2184 Name = D.getIdentifier(); 2185 2186 // Does this declaration declare a typedef-name? 2187 bool IsTypedefName = 2188 D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef || 2189 D.getContext() == Declarator::AliasDeclContext || 2190 D.getContext() == Declarator::AliasTemplateContext; 2191 2192 // Does T refer to a function type with a cv-qualifier or a ref-qualifier? 2193 bool IsQualifiedFunction = T->isFunctionProtoType() && 2194 (T->castAs<FunctionProtoType>()->getTypeQuals() != 0 || 2195 T->castAs<FunctionProtoType>()->getRefQualifier() != RQ_None); 2196 2197 // Walk the DeclTypeInfo, building the recursive type as we go. 2198 // DeclTypeInfos are ordered from the identifier out, which is 2199 // opposite of what we want :). 2200 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 2201 unsigned chunkIndex = e - i - 1; 2202 state.setCurrentChunkIndex(chunkIndex); 2203 DeclaratorChunk &DeclType = D.getTypeObject(chunkIndex); 2204 if (IsQualifiedFunction) { 2205 checkQualifiedFunction(S, T, DeclType); 2206 IsQualifiedFunction = DeclType.Kind == DeclaratorChunk::Paren; 2207 } 2208 switch (DeclType.Kind) { 2209 case DeclaratorChunk::Paren: 2210 T = S.BuildParenType(T); 2211 break; 2212 case DeclaratorChunk::BlockPointer: 2213 // If blocks are disabled, emit an error. 2214 if (!LangOpts.Blocks) 2215 S.Diag(DeclType.Loc, diag::err_blocks_disable); 2216 2217 T = S.BuildBlockPointerType(T, D.getIdentifierLoc(), Name); 2218 if (DeclType.Cls.TypeQuals) 2219 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Cls.TypeQuals); 2220 break; 2221 case DeclaratorChunk::Pointer: 2222 // Verify that we're not building a pointer to pointer to function with 2223 // exception specification. 2224 if (LangOpts.CPlusPlus && S.CheckDistantExceptionSpec(T)) { 2225 S.Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 2226 D.setInvalidType(true); 2227 // Build the type anyway. 2228 } 2229 if (LangOpts.ObjC1 && T->getAs<ObjCObjectType>()) { 2230 T = Context.getObjCObjectPointerType(T); 2231 if (DeclType.Ptr.TypeQuals) 2232 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Ptr.TypeQuals); 2233 break; 2234 } 2235 T = S.BuildPointerType(T, DeclType.Loc, Name); 2236 if (DeclType.Ptr.TypeQuals) 2237 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Ptr.TypeQuals); 2238 2239 break; 2240 case DeclaratorChunk::Reference: { 2241 // Verify that we're not building a reference to pointer to function with 2242 // exception specification. 2243 if (LangOpts.CPlusPlus && S.CheckDistantExceptionSpec(T)) { 2244 S.Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 2245 D.setInvalidType(true); 2246 // Build the type anyway. 2247 } 2248 T = S.BuildReferenceType(T, DeclType.Ref.LValueRef, DeclType.Loc, Name); 2249 2250 Qualifiers Quals; 2251 if (DeclType.Ref.HasRestrict) 2252 T = S.BuildQualifiedType(T, DeclType.Loc, Qualifiers::Restrict); 2253 break; 2254 } 2255 case DeclaratorChunk::Array: { 2256 // Verify that we're not building an array of pointers to function with 2257 // exception specification. 2258 if (LangOpts.CPlusPlus && S.CheckDistantExceptionSpec(T)) { 2259 S.Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 2260 D.setInvalidType(true); 2261 // Build the type anyway. 2262 } 2263 DeclaratorChunk::ArrayTypeInfo &ATI = DeclType.Arr; 2264 Expr *ArraySize = static_cast<Expr*>(ATI.NumElts); 2265 ArrayType::ArraySizeModifier ASM; 2266 if (ATI.isStar) 2267 ASM = ArrayType::Star; 2268 else if (ATI.hasStatic) 2269 ASM = ArrayType::Static; 2270 else 2271 ASM = ArrayType::Normal; 2272 if (ASM == ArrayType::Star && !D.isPrototypeContext()) { 2273 // FIXME: This check isn't quite right: it allows star in prototypes 2274 // for function definitions, and disallows some edge cases detailed 2275 // in http://gcc.gnu.org/ml/gcc-patches/2009-02/msg00133.html 2276 S.Diag(DeclType.Loc, diag::err_array_star_outside_prototype); 2277 ASM = ArrayType::Normal; 2278 D.setInvalidType(true); 2279 } 2280 2281 // C99 6.7.5.2p1: The optional type qualifiers and the keyword static 2282 // shall appear only in a declaration of a function parameter with an 2283 // array type, ... 2284 if (ASM == ArrayType::Static || ATI.TypeQuals) { 2285 if (!(D.isPrototypeContext() || 2286 D.getContext() == Declarator::KNRTypeListContext)) { 2287 S.Diag(DeclType.Loc, diag::err_array_static_outside_prototype) << 2288 (ASM == ArrayType::Static ? "'static'" : "type qualifier"); 2289 // Remove the 'static' and the type qualifiers. 2290 if (ASM == ArrayType::Static) 2291 ASM = ArrayType::Normal; 2292 ATI.TypeQuals = 0; 2293 D.setInvalidType(true); 2294 } 2295 2296 // C99 6.7.5.2p1: ... and then only in the outermost array type 2297 // derivation. 2298 unsigned x = chunkIndex; 2299 while (x != 0) { 2300 // Walk outwards along the declarator chunks. 2301 x--; 2302 const DeclaratorChunk &DC = D.getTypeObject(x); 2303 switch (DC.Kind) { 2304 case DeclaratorChunk::Paren: 2305 continue; 2306 case DeclaratorChunk::Array: 2307 case DeclaratorChunk::Pointer: 2308 case DeclaratorChunk::Reference: 2309 case DeclaratorChunk::MemberPointer: 2310 S.Diag(DeclType.Loc, diag::err_array_static_not_outermost) << 2311 (ASM == ArrayType::Static ? "'static'" : "type qualifier"); 2312 if (ASM == ArrayType::Static) 2313 ASM = ArrayType::Normal; 2314 ATI.TypeQuals = 0; 2315 D.setInvalidType(true); 2316 break; 2317 case DeclaratorChunk::Function: 2318 case DeclaratorChunk::BlockPointer: 2319 // These are invalid anyway, so just ignore. 2320 break; 2321 } 2322 } 2323 } 2324 2325 T = S.BuildArrayType(T, ASM, ArraySize, ATI.TypeQuals, 2326 SourceRange(DeclType.Loc, DeclType.EndLoc), Name); 2327 break; 2328 } 2329 case DeclaratorChunk::Function: { 2330 // If the function declarator has a prototype (i.e. it is not () and 2331 // does not have a K&R-style identifier list), then the arguments are part 2332 // of the type, otherwise the argument list is (). 2333 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun; 2334 IsQualifiedFunction = FTI.TypeQuals || FTI.hasRefQualifier(); 2335 2336 // Check for auto functions and trailing return type and adjust the 2337 // return type accordingly. 2338 if (!D.isInvalidType()) { 2339 // trailing-return-type is only required if we're declaring a function, 2340 // and not, for instance, a pointer to a function. 2341 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto && 2342 !FTI.hasTrailingReturnType() && chunkIndex == 0) { 2343 S.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 2344 diag::err_auto_missing_trailing_return); 2345 T = Context.IntTy; 2346 D.setInvalidType(true); 2347 } else if (FTI.hasTrailingReturnType()) { 2348 // T must be exactly 'auto' at this point. See CWG issue 681. 2349 if (isa<ParenType>(T)) { 2350 S.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 2351 diag::err_trailing_return_in_parens) 2352 << T << D.getDeclSpec().getSourceRange(); 2353 D.setInvalidType(true); 2354 } else if (D.getContext() != Declarator::LambdaExprContext && 2355 (T.hasQualifiers() || !isa<AutoType>(T))) { 2356 S.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 2357 diag::err_trailing_return_without_auto) 2358 << T << D.getDeclSpec().getSourceRange(); 2359 D.setInvalidType(true); 2360 } 2361 T = S.GetTypeFromParser(FTI.getTrailingReturnType(), &TInfo); 2362 if (T.isNull()) { 2363 // An error occurred parsing the trailing return type. 2364 T = Context.IntTy; 2365 D.setInvalidType(true); 2366 } 2367 } 2368 } 2369 2370 // C99 6.7.5.3p1: The return type may not be a function or array type. 2371 // For conversion functions, we'll diagnose this particular error later. 2372 if ((T->isArrayType() || T->isFunctionType()) && 2373 (D.getName().getKind() != UnqualifiedId::IK_ConversionFunctionId)) { 2374 unsigned diagID = diag::err_func_returning_array_function; 2375 // Last processing chunk in block context means this function chunk 2376 // represents the block. 2377 if (chunkIndex == 0 && 2378 D.getContext() == Declarator::BlockLiteralContext) 2379 diagID = diag::err_block_returning_array_function; 2380 S.Diag(DeclType.Loc, diagID) << T->isFunctionType() << T; 2381 T = Context.IntTy; 2382 D.setInvalidType(true); 2383 } 2384 2385 // Do not allow returning half FP value. 2386 // FIXME: This really should be in BuildFunctionType. 2387 if (T->isHalfType()) { 2388 S.Diag(D.getIdentifierLoc(), 2389 diag::err_parameters_retval_cannot_have_fp16_type) << 1 2390 << FixItHint::CreateInsertion(D.getIdentifierLoc(), "*"); 2391 D.setInvalidType(true); 2392 } 2393 2394 // cv-qualifiers on return types are pointless except when the type is a 2395 // class type in C++. 2396 if (isa<PointerType>(T) && T.getLocalCVRQualifiers() && 2397 (D.getName().getKind() != UnqualifiedId::IK_ConversionFunctionId) && 2398 (!LangOpts.CPlusPlus || !T->isDependentType())) { 2399 assert(chunkIndex + 1 < e && "No DeclaratorChunk for the return type?"); 2400 DeclaratorChunk ReturnTypeChunk = D.getTypeObject(chunkIndex + 1); 2401 assert(ReturnTypeChunk.Kind == DeclaratorChunk::Pointer); 2402 2403 DeclaratorChunk::PointerTypeInfo &PTI = ReturnTypeChunk.Ptr; 2404 2405 DiagnoseIgnoredQualifiers(PTI.TypeQuals, 2406 SourceLocation::getFromRawEncoding(PTI.ConstQualLoc), 2407 SourceLocation::getFromRawEncoding(PTI.VolatileQualLoc), 2408 SourceLocation::getFromRawEncoding(PTI.RestrictQualLoc), 2409 S); 2410 2411 } else if (T.getCVRQualifiers() && D.getDeclSpec().getTypeQualifiers() && 2412 (!LangOpts.CPlusPlus || 2413 (!T->isDependentType() && !T->isRecordType()))) { 2414 2415 DiagnoseIgnoredQualifiers(D.getDeclSpec().getTypeQualifiers(), 2416 D.getDeclSpec().getConstSpecLoc(), 2417 D.getDeclSpec().getVolatileSpecLoc(), 2418 D.getDeclSpec().getRestrictSpecLoc(), 2419 S); 2420 } 2421 2422 if (LangOpts.CPlusPlus && D.getDeclSpec().isTypeSpecOwned()) { 2423 // C++ [dcl.fct]p6: 2424 // Types shall not be defined in return or parameter types. 2425 TagDecl *Tag = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 2426 if (Tag->isCompleteDefinition()) 2427 S.Diag(Tag->getLocation(), diag::err_type_defined_in_result_type) 2428 << Context.getTypeDeclType(Tag); 2429 } 2430 2431 // Exception specs are not allowed in typedefs. Complain, but add it 2432 // anyway. 2433 if (IsTypedefName && FTI.getExceptionSpecType()) 2434 S.Diag(FTI.getExceptionSpecLoc(), diag::err_exception_spec_in_typedef) 2435 << (D.getContext() == Declarator::AliasDeclContext || 2436 D.getContext() == Declarator::AliasTemplateContext); 2437 2438 // If we see "T var();" or "T var(T());" at block scope, it is probably 2439 // an attempt to initialize a variable, not a function declaration. 2440 if (FTI.isAmbiguous) 2441 warnAboutAmbiguousFunction(S, D, DeclType, T); 2442 2443 if (!FTI.NumArgs && !FTI.isVariadic && !LangOpts.CPlusPlus) { 2444 // Simple void foo(), where the incoming T is the result type. 2445 T = Context.getFunctionNoProtoType(T); 2446 } else { 2447 // We allow a zero-parameter variadic function in C if the 2448 // function is marked with the "overloadable" attribute. Scan 2449 // for this attribute now. 2450 if (!FTI.NumArgs && FTI.isVariadic && !LangOpts.CPlusPlus) { 2451 bool Overloadable = false; 2452 for (const AttributeList *Attrs = D.getAttributes(); 2453 Attrs; Attrs = Attrs->getNext()) { 2454 if (Attrs->getKind() == AttributeList::AT_Overloadable) { 2455 Overloadable = true; 2456 break; 2457 } 2458 } 2459 2460 if (!Overloadable) 2461 S.Diag(FTI.getEllipsisLoc(), diag::err_ellipsis_first_arg); 2462 } 2463 2464 if (FTI.NumArgs && FTI.ArgInfo[0].Param == 0) { 2465 // C99 6.7.5.3p3: Reject int(x,y,z) when it's not a function 2466 // definition. 2467 S.Diag(FTI.ArgInfo[0].IdentLoc, diag::err_ident_list_in_fn_declaration); 2468 D.setInvalidType(true); 2469 break; 2470 } 2471 2472 FunctionProtoType::ExtProtoInfo EPI; 2473 EPI.Variadic = FTI.isVariadic; 2474 EPI.HasTrailingReturn = FTI.hasTrailingReturnType(); 2475 EPI.TypeQuals = FTI.TypeQuals; 2476 EPI.RefQualifier = !FTI.hasRefQualifier()? RQ_None 2477 : FTI.RefQualifierIsLValueRef? RQ_LValue 2478 : RQ_RValue; 2479 2480 // Otherwise, we have a function with an argument list that is 2481 // potentially variadic. 2482 SmallVector<QualType, 16> ArgTys; 2483 ArgTys.reserve(FTI.NumArgs); 2484 2485 SmallVector<bool, 16> ConsumedArguments; 2486 ConsumedArguments.reserve(FTI.NumArgs); 2487 bool HasAnyConsumedArguments = false; 2488 2489 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 2490 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 2491 QualType ArgTy = Param->getType(); 2492 assert(!ArgTy.isNull() && "Couldn't parse type?"); 2493 2494 // Adjust the parameter type. 2495 assert((ArgTy == Context.getAdjustedParameterType(ArgTy)) && 2496 "Unadjusted type?"); 2497 2498 // Look for 'void'. void is allowed only as a single argument to a 2499 // function with no other parameters (C99 6.7.5.3p10). We record 2500 // int(void) as a FunctionProtoType with an empty argument list. 2501 if (ArgTy->isVoidType()) { 2502 // If this is something like 'float(int, void)', reject it. 'void' 2503 // is an incomplete type (C99 6.2.5p19) and function decls cannot 2504 // have arguments of incomplete type. 2505 if (FTI.NumArgs != 1 || FTI.isVariadic) { 2506 S.Diag(DeclType.Loc, diag::err_void_only_param); 2507 ArgTy = Context.IntTy; 2508 Param->setType(ArgTy); 2509 } else if (FTI.ArgInfo[i].Ident) { 2510 // Reject, but continue to parse 'int(void abc)'. 2511 S.Diag(FTI.ArgInfo[i].IdentLoc, 2512 diag::err_param_with_void_type); 2513 ArgTy = Context.IntTy; 2514 Param->setType(ArgTy); 2515 } else { 2516 // Reject, but continue to parse 'float(const void)'. 2517 if (ArgTy.hasQualifiers()) 2518 S.Diag(DeclType.Loc, diag::err_void_param_qualified); 2519 2520 // Do not add 'void' to the ArgTys list. 2521 break; 2522 } 2523 } else if (ArgTy->isHalfType()) { 2524 // Disallow half FP arguments. 2525 // FIXME: This really should be in BuildFunctionType. 2526 S.Diag(Param->getLocation(), 2527 diag::err_parameters_retval_cannot_have_fp16_type) << 0 2528 << FixItHint::CreateInsertion(Param->getLocation(), "*"); 2529 D.setInvalidType(); 2530 } else if (!FTI.hasPrototype) { 2531 if (ArgTy->isPromotableIntegerType()) { 2532 ArgTy = Context.getPromotedIntegerType(ArgTy); 2533 Param->setKNRPromoted(true); 2534 } else if (const BuiltinType* BTy = ArgTy->getAs<BuiltinType>()) { 2535 if (BTy->getKind() == BuiltinType::Float) { 2536 ArgTy = Context.DoubleTy; 2537 Param->setKNRPromoted(true); 2538 } 2539 } 2540 } 2541 2542 if (LangOpts.ObjCAutoRefCount) { 2543 bool Consumed = Param->hasAttr<NSConsumedAttr>(); 2544 ConsumedArguments.push_back(Consumed); 2545 HasAnyConsumedArguments |= Consumed; 2546 } 2547 2548 ArgTys.push_back(ArgTy); 2549 } 2550 2551 if (HasAnyConsumedArguments) 2552 EPI.ConsumedArguments = ConsumedArguments.data(); 2553 2554 SmallVector<QualType, 4> Exceptions; 2555 SmallVector<ParsedType, 2> DynamicExceptions; 2556 SmallVector<SourceRange, 2> DynamicExceptionRanges; 2557 Expr *NoexceptExpr = 0; 2558 2559 if (FTI.getExceptionSpecType() == EST_Dynamic) { 2560 // FIXME: It's rather inefficient to have to split into two vectors 2561 // here. 2562 unsigned N = FTI.NumExceptions; 2563 DynamicExceptions.reserve(N); 2564 DynamicExceptionRanges.reserve(N); 2565 for (unsigned I = 0; I != N; ++I) { 2566 DynamicExceptions.push_back(FTI.Exceptions[I].Ty); 2567 DynamicExceptionRanges.push_back(FTI.Exceptions[I].Range); 2568 } 2569 } else if (FTI.getExceptionSpecType() == EST_ComputedNoexcept) { 2570 NoexceptExpr = FTI.NoexceptExpr; 2571 } 2572 2573 S.checkExceptionSpecification(FTI.getExceptionSpecType(), 2574 DynamicExceptions, 2575 DynamicExceptionRanges, 2576 NoexceptExpr, 2577 Exceptions, 2578 EPI); 2579 2580 if (FTI.getExceptionSpecType() == EST_None && 2581 ImplicitlyNoexcept && chunkIndex == 0) { 2582 // Only the outermost chunk is marked noexcept, of course. 2583 EPI.ExceptionSpecType = EST_BasicNoexcept; 2584 } 2585 2586 T = Context.getFunctionType(T, ArgTys.data(), ArgTys.size(), EPI); 2587 } 2588 2589 break; 2590 } 2591 case DeclaratorChunk::MemberPointer: 2592 // The scope spec must refer to a class, or be dependent. 2593 CXXScopeSpec &SS = DeclType.Mem.Scope(); 2594 QualType ClsType; 2595 if (SS.isInvalid()) { 2596 // Avoid emitting extra errors if we already errored on the scope. 2597 D.setInvalidType(true); 2598 } else if (S.isDependentScopeSpecifier(SS) || 2599 dyn_cast_or_null<CXXRecordDecl>(S.computeDeclContext(SS))) { 2600 NestedNameSpecifier *NNS 2601 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 2602 NestedNameSpecifier *NNSPrefix = NNS->getPrefix(); 2603 switch (NNS->getKind()) { 2604 case NestedNameSpecifier::Identifier: 2605 ClsType = Context.getDependentNameType(ETK_None, NNSPrefix, 2606 NNS->getAsIdentifier()); 2607 break; 2608 2609 case NestedNameSpecifier::Namespace: 2610 case NestedNameSpecifier::NamespaceAlias: 2611 case NestedNameSpecifier::Global: 2612 llvm_unreachable("Nested-name-specifier must name a type"); 2613 2614 case NestedNameSpecifier::TypeSpec: 2615 case NestedNameSpecifier::TypeSpecWithTemplate: 2616 ClsType = QualType(NNS->getAsType(), 0); 2617 // Note: if the NNS has a prefix and ClsType is a nondependent 2618 // TemplateSpecializationType, then the NNS prefix is NOT included 2619 // in ClsType; hence we wrap ClsType into an ElaboratedType. 2620 // NOTE: in particular, no wrap occurs if ClsType already is an 2621 // Elaborated, DependentName, or DependentTemplateSpecialization. 2622 if (NNSPrefix && isa<TemplateSpecializationType>(NNS->getAsType())) 2623 ClsType = Context.getElaboratedType(ETK_None, NNSPrefix, ClsType); 2624 break; 2625 } 2626 } else { 2627 S.Diag(DeclType.Mem.Scope().getBeginLoc(), 2628 diag::err_illegal_decl_mempointer_in_nonclass) 2629 << (D.getIdentifier() ? D.getIdentifier()->getName() : "type name") 2630 << DeclType.Mem.Scope().getRange(); 2631 D.setInvalidType(true); 2632 } 2633 2634 if (!ClsType.isNull()) 2635 T = S.BuildMemberPointerType(T, ClsType, DeclType.Loc, D.getIdentifier()); 2636 if (T.isNull()) { 2637 T = Context.IntTy; 2638 D.setInvalidType(true); 2639 } else if (DeclType.Mem.TypeQuals) { 2640 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Mem.TypeQuals); 2641 } 2642 break; 2643 } 2644 2645 if (T.isNull()) { 2646 D.setInvalidType(true); 2647 T = Context.IntTy; 2648 } 2649 2650 // See if there are any attributes on this declarator chunk. 2651 if (AttributeList *attrs = const_cast<AttributeList*>(DeclType.getAttrs())) 2652 processTypeAttrs(state, T, false, attrs); 2653 } 2654 2655 if (LangOpts.CPlusPlus && T->isFunctionType()) { 2656 const FunctionProtoType *FnTy = T->getAs<FunctionProtoType>(); 2657 assert(FnTy && "Why oh why is there not a FunctionProtoType here?"); 2658 2659 // C++ 8.3.5p4: 2660 // A cv-qualifier-seq shall only be part of the function type 2661 // for a nonstatic member function, the function type to which a pointer 2662 // to member refers, or the top-level function type of a function typedef 2663 // declaration. 2664 // 2665 // Core issue 547 also allows cv-qualifiers on function types that are 2666 // top-level template type arguments. 2667 bool FreeFunction; 2668 if (!D.getCXXScopeSpec().isSet()) { 2669 FreeFunction = ((D.getContext() != Declarator::MemberContext && 2670 D.getContext() != Declarator::LambdaExprContext) || 2671 D.getDeclSpec().isFriendSpecified()); 2672 } else { 2673 DeclContext *DC = S.computeDeclContext(D.getCXXScopeSpec()); 2674 FreeFunction = (DC && !DC->isRecord()); 2675 } 2676 2677 // C++0x [dcl.constexpr]p8: A constexpr specifier for a non-static member 2678 // function that is not a constructor declares that function to be const. 2679 if (D.getDeclSpec().isConstexprSpecified() && !FreeFunction && 2680 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static && 2681 D.getName().getKind() != UnqualifiedId::IK_ConstructorName && 2682 D.getName().getKind() != UnqualifiedId::IK_ConstructorTemplateId && 2683 !(FnTy->getTypeQuals() & DeclSpec::TQ_const)) { 2684 // Rebuild function type adding a 'const' qualifier. 2685 FunctionProtoType::ExtProtoInfo EPI = FnTy->getExtProtoInfo(); 2686 EPI.TypeQuals |= DeclSpec::TQ_const; 2687 T = Context.getFunctionType(FnTy->getResultType(), 2688 FnTy->arg_type_begin(), 2689 FnTy->getNumArgs(), EPI); 2690 } 2691 2692 // C++11 [dcl.fct]p6 (w/DR1417): 2693 // An attempt to specify a function type with a cv-qualifier-seq or a 2694 // ref-qualifier (including by typedef-name) is ill-formed unless it is: 2695 // - the function type for a non-static member function, 2696 // - the function type to which a pointer to member refers, 2697 // - the top-level function type of a function typedef declaration or 2698 // alias-declaration, 2699 // - the type-id in the default argument of a type-parameter, or 2700 // - the type-id of a template-argument for a type-parameter 2701 if (IsQualifiedFunction && 2702 !(!FreeFunction && 2703 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) && 2704 !IsTypedefName && 2705 D.getContext() != Declarator::TemplateTypeArgContext) { 2706 SourceLocation Loc = D.getLocStart(); 2707 SourceRange RemovalRange; 2708 unsigned I; 2709 if (D.isFunctionDeclarator(I)) { 2710 SmallVector<SourceLocation, 4> RemovalLocs; 2711 const DeclaratorChunk &Chunk = D.getTypeObject(I); 2712 assert(Chunk.Kind == DeclaratorChunk::Function); 2713 if (Chunk.Fun.hasRefQualifier()) 2714 RemovalLocs.push_back(Chunk.Fun.getRefQualifierLoc()); 2715 if (Chunk.Fun.TypeQuals & Qualifiers::Const) 2716 RemovalLocs.push_back(Chunk.Fun.getConstQualifierLoc()); 2717 if (Chunk.Fun.TypeQuals & Qualifiers::Volatile) 2718 RemovalLocs.push_back(Chunk.Fun.getVolatileQualifierLoc()); 2719 // FIXME: We do not track the location of the __restrict qualifier. 2720 //if (Chunk.Fun.TypeQuals & Qualifiers::Restrict) 2721 // RemovalLocs.push_back(Chunk.Fun.getRestrictQualifierLoc()); 2722 if (!RemovalLocs.empty()) { 2723 std::sort(RemovalLocs.begin(), RemovalLocs.end(), 2724 BeforeThanCompare<SourceLocation>(S.getSourceManager())); 2725 RemovalRange = SourceRange(RemovalLocs.front(), RemovalLocs.back()); 2726 Loc = RemovalLocs.front(); 2727 } 2728 } 2729 2730 S.Diag(Loc, diag::err_invalid_qualified_function_type) 2731 << FreeFunction << D.isFunctionDeclarator() << T 2732 << getFunctionQualifiersAsString(FnTy) 2733 << FixItHint::CreateRemoval(RemovalRange); 2734 2735 // Strip the cv-qualifiers and ref-qualifiers from the type. 2736 FunctionProtoType::ExtProtoInfo EPI = FnTy->getExtProtoInfo(); 2737 EPI.TypeQuals = 0; 2738 EPI.RefQualifier = RQ_None; 2739 2740 T = Context.getFunctionType(FnTy->getResultType(), 2741 FnTy->arg_type_begin(), 2742 FnTy->getNumArgs(), EPI); 2743 } 2744 } 2745 2746 // Apply any undistributed attributes from the declarator. 2747 if (!T.isNull()) 2748 if (AttributeList *attrs = D.getAttributes()) 2749 processTypeAttrs(state, T, false, attrs); 2750 2751 // Diagnose any ignored type attributes. 2752 if (!T.isNull()) state.diagnoseIgnoredTypeAttrs(T); 2753 2754 // C++0x [dcl.constexpr]p9: 2755 // A constexpr specifier used in an object declaration declares the object 2756 // as const. 2757 if (D.getDeclSpec().isConstexprSpecified() && T->isObjectType()) { 2758 T.addConst(); 2759 } 2760 2761 // If there was an ellipsis in the declarator, the declaration declares a 2762 // parameter pack whose type may be a pack expansion type. 2763 if (D.hasEllipsis() && !T.isNull()) { 2764 // C++0x [dcl.fct]p13: 2765 // A declarator-id or abstract-declarator containing an ellipsis shall 2766 // only be used in a parameter-declaration. Such a parameter-declaration 2767 // is a parameter pack (14.5.3). [...] 2768 switch (D.getContext()) { 2769 case Declarator::PrototypeContext: 2770 // C++0x [dcl.fct]p13: 2771 // [...] When it is part of a parameter-declaration-clause, the 2772 // parameter pack is a function parameter pack (14.5.3). The type T 2773 // of the declarator-id of the function parameter pack shall contain 2774 // a template parameter pack; each template parameter pack in T is 2775 // expanded by the function parameter pack. 2776 // 2777 // We represent function parameter packs as function parameters whose 2778 // type is a pack expansion. 2779 if (!T->containsUnexpandedParameterPack()) { 2780 S.Diag(D.getEllipsisLoc(), 2781 diag::err_function_parameter_pack_without_parameter_packs) 2782 << T << D.getSourceRange(); 2783 D.setEllipsisLoc(SourceLocation()); 2784 } else { 2785 T = Context.getPackExpansionType(T, llvm::Optional<unsigned>()); 2786 } 2787 break; 2788 2789 case Declarator::TemplateParamContext: 2790 // C++0x [temp.param]p15: 2791 // If a template-parameter is a [...] is a parameter-declaration that 2792 // declares a parameter pack (8.3.5), then the template-parameter is a 2793 // template parameter pack (14.5.3). 2794 // 2795 // Note: core issue 778 clarifies that, if there are any unexpanded 2796 // parameter packs in the type of the non-type template parameter, then 2797 // it expands those parameter packs. 2798 if (T->containsUnexpandedParameterPack()) 2799 T = Context.getPackExpansionType(T, llvm::Optional<unsigned>()); 2800 else 2801 S.Diag(D.getEllipsisLoc(), 2802 LangOpts.CPlusPlus0x 2803 ? diag::warn_cxx98_compat_variadic_templates 2804 : diag::ext_variadic_templates); 2805 break; 2806 2807 case Declarator::FileContext: 2808 case Declarator::KNRTypeListContext: 2809 case Declarator::ObjCParameterContext: // FIXME: special diagnostic here? 2810 case Declarator::ObjCResultContext: // FIXME: special diagnostic here? 2811 case Declarator::TypeNameContext: 2812 case Declarator::CXXNewContext: 2813 case Declarator::AliasDeclContext: 2814 case Declarator::AliasTemplateContext: 2815 case Declarator::MemberContext: 2816 case Declarator::BlockContext: 2817 case Declarator::ForContext: 2818 case Declarator::ConditionContext: 2819 case Declarator::CXXCatchContext: 2820 case Declarator::ObjCCatchContext: 2821 case Declarator::BlockLiteralContext: 2822 case Declarator::LambdaExprContext: 2823 case Declarator::TrailingReturnContext: 2824 case Declarator::TemplateTypeArgContext: 2825 // FIXME: We may want to allow parameter packs in block-literal contexts 2826 // in the future. 2827 S.Diag(D.getEllipsisLoc(), diag::err_ellipsis_in_declarator_not_parameter); 2828 D.setEllipsisLoc(SourceLocation()); 2829 break; 2830 } 2831 } 2832 2833 if (T.isNull()) 2834 return Context.getNullTypeSourceInfo(); 2835 else if (D.isInvalidType()) 2836 return Context.getTrivialTypeSourceInfo(T); 2837 2838 return S.GetTypeSourceInfoForDeclarator(D, T, TInfo); 2839} 2840 2841/// GetTypeForDeclarator - Convert the type for the specified 2842/// declarator to Type instances. 2843/// 2844/// The result of this call will never be null, but the associated 2845/// type may be a null type if there's an unrecoverable error. 2846TypeSourceInfo *Sema::GetTypeForDeclarator(Declarator &D, Scope *S) { 2847 // Determine the type of the declarator. Not all forms of declarator 2848 // have a type. 2849 2850 TypeProcessingState state(*this, D); 2851 2852 TypeSourceInfo *ReturnTypeInfo = 0; 2853 QualType T = GetDeclSpecTypeForDeclarator(state, ReturnTypeInfo); 2854 if (T.isNull()) 2855 return Context.getNullTypeSourceInfo(); 2856 2857 if (D.isPrototypeContext() && getLangOpts().ObjCAutoRefCount) 2858 inferARCWriteback(state, T); 2859 2860 return GetFullTypeForDeclarator(state, T, ReturnTypeInfo); 2861} 2862 2863static void transferARCOwnershipToDeclSpec(Sema &S, 2864 QualType &declSpecTy, 2865 Qualifiers::ObjCLifetime ownership) { 2866 if (declSpecTy->isObjCRetainableType() && 2867 declSpecTy.getObjCLifetime() == Qualifiers::OCL_None) { 2868 Qualifiers qs; 2869 qs.addObjCLifetime(ownership); 2870 declSpecTy = S.Context.getQualifiedType(declSpecTy, qs); 2871 } 2872} 2873 2874static void transferARCOwnershipToDeclaratorChunk(TypeProcessingState &state, 2875 Qualifiers::ObjCLifetime ownership, 2876 unsigned chunkIndex) { 2877 Sema &S = state.getSema(); 2878 Declarator &D = state.getDeclarator(); 2879 2880 // Look for an explicit lifetime attribute. 2881 DeclaratorChunk &chunk = D.getTypeObject(chunkIndex); 2882 for (const AttributeList *attr = chunk.getAttrs(); attr; 2883 attr = attr->getNext()) 2884 if (attr->getKind() == AttributeList::AT_ObjCOwnership) 2885 return; 2886 2887 const char *attrStr = 0; 2888 switch (ownership) { 2889 case Qualifiers::OCL_None: llvm_unreachable("no ownership!"); 2890 case Qualifiers::OCL_ExplicitNone: attrStr = "none"; break; 2891 case Qualifiers::OCL_Strong: attrStr = "strong"; break; 2892 case Qualifiers::OCL_Weak: attrStr = "weak"; break; 2893 case Qualifiers::OCL_Autoreleasing: attrStr = "autoreleasing"; break; 2894 } 2895 2896 // If there wasn't one, add one (with an invalid source location 2897 // so that we don't make an AttributedType for it). 2898 AttributeList *attr = D.getAttributePool() 2899 .create(&S.Context.Idents.get("objc_ownership"), SourceLocation(), 2900 /*scope*/ 0, SourceLocation(), 2901 &S.Context.Idents.get(attrStr), SourceLocation(), 2902 /*args*/ 0, 0, AttributeList::AS_GNU); 2903 spliceAttrIntoList(*attr, chunk.getAttrListRef()); 2904 2905 // TODO: mark whether we did this inference? 2906} 2907 2908/// \brief Used for transferring ownership in casts resulting in l-values. 2909static void transferARCOwnership(TypeProcessingState &state, 2910 QualType &declSpecTy, 2911 Qualifiers::ObjCLifetime ownership) { 2912 Sema &S = state.getSema(); 2913 Declarator &D = state.getDeclarator(); 2914 2915 int inner = -1; 2916 bool hasIndirection = false; 2917 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 2918 DeclaratorChunk &chunk = D.getTypeObject(i); 2919 switch (chunk.Kind) { 2920 case DeclaratorChunk::Paren: 2921 // Ignore parens. 2922 break; 2923 2924 case DeclaratorChunk::Array: 2925 case DeclaratorChunk::Reference: 2926 case DeclaratorChunk::Pointer: 2927 if (inner != -1) 2928 hasIndirection = true; 2929 inner = i; 2930 break; 2931 2932 case DeclaratorChunk::BlockPointer: 2933 if (inner != -1) 2934 transferARCOwnershipToDeclaratorChunk(state, ownership, i); 2935 return; 2936 2937 case DeclaratorChunk::Function: 2938 case DeclaratorChunk::MemberPointer: 2939 return; 2940 } 2941 } 2942 2943 if (inner == -1) 2944 return; 2945 2946 DeclaratorChunk &chunk = D.getTypeObject(inner); 2947 if (chunk.Kind == DeclaratorChunk::Pointer) { 2948 if (declSpecTy->isObjCRetainableType()) 2949 return transferARCOwnershipToDeclSpec(S, declSpecTy, ownership); 2950 if (declSpecTy->isObjCObjectType() && hasIndirection) 2951 return transferARCOwnershipToDeclaratorChunk(state, ownership, inner); 2952 } else { 2953 assert(chunk.Kind == DeclaratorChunk::Array || 2954 chunk.Kind == DeclaratorChunk::Reference); 2955 return transferARCOwnershipToDeclSpec(S, declSpecTy, ownership); 2956 } 2957} 2958 2959TypeSourceInfo *Sema::GetTypeForDeclaratorCast(Declarator &D, QualType FromTy) { 2960 TypeProcessingState state(*this, D); 2961 2962 TypeSourceInfo *ReturnTypeInfo = 0; 2963 QualType declSpecTy = GetDeclSpecTypeForDeclarator(state, ReturnTypeInfo); 2964 if (declSpecTy.isNull()) 2965 return Context.getNullTypeSourceInfo(); 2966 2967 if (getLangOpts().ObjCAutoRefCount) { 2968 Qualifiers::ObjCLifetime ownership = Context.getInnerObjCOwnership(FromTy); 2969 if (ownership != Qualifiers::OCL_None) 2970 transferARCOwnership(state, declSpecTy, ownership); 2971 } 2972 2973 return GetFullTypeForDeclarator(state, declSpecTy, ReturnTypeInfo); 2974} 2975 2976/// Map an AttributedType::Kind to an AttributeList::Kind. 2977static AttributeList::Kind getAttrListKind(AttributedType::Kind kind) { 2978 switch (kind) { 2979 case AttributedType::attr_address_space: 2980 return AttributeList::AT_AddressSpace; 2981 case AttributedType::attr_regparm: 2982 return AttributeList::AT_Regparm; 2983 case AttributedType::attr_vector_size: 2984 return AttributeList::AT_VectorSize; 2985 case AttributedType::attr_neon_vector_type: 2986 return AttributeList::AT_NeonVectorType; 2987 case AttributedType::attr_neon_polyvector_type: 2988 return AttributeList::AT_NeonPolyVectorType; 2989 case AttributedType::attr_objc_gc: 2990 return AttributeList::AT_ObjCGC; 2991 case AttributedType::attr_objc_ownership: 2992 return AttributeList::AT_ObjCOwnership; 2993 case AttributedType::attr_noreturn: 2994 return AttributeList::AT_NoReturn; 2995 case AttributedType::attr_cdecl: 2996 return AttributeList::AT_CDecl; 2997 case AttributedType::attr_fastcall: 2998 return AttributeList::AT_FastCall; 2999 case AttributedType::attr_stdcall: 3000 return AttributeList::AT_StdCall; 3001 case AttributedType::attr_thiscall: 3002 return AttributeList::AT_ThisCall; 3003 case AttributedType::attr_pascal: 3004 return AttributeList::AT_Pascal; 3005 case AttributedType::attr_pcs: 3006 return AttributeList::AT_Pcs; 3007 } 3008 llvm_unreachable("unexpected attribute kind!"); 3009} 3010 3011static void fillAttributedTypeLoc(AttributedTypeLoc TL, 3012 const AttributeList *attrs) { 3013 AttributedType::Kind kind = TL.getAttrKind(); 3014 3015 assert(attrs && "no type attributes in the expected location!"); 3016 AttributeList::Kind parsedKind = getAttrListKind(kind); 3017 while (attrs->getKind() != parsedKind) { 3018 attrs = attrs->getNext(); 3019 assert(attrs && "no matching attribute in expected location!"); 3020 } 3021 3022 TL.setAttrNameLoc(attrs->getLoc()); 3023 if (TL.hasAttrExprOperand()) 3024 TL.setAttrExprOperand(attrs->getArg(0)); 3025 else if (TL.hasAttrEnumOperand()) 3026 TL.setAttrEnumOperandLoc(attrs->getParameterLoc()); 3027 3028 // FIXME: preserve this information to here. 3029 if (TL.hasAttrOperand()) 3030 TL.setAttrOperandParensRange(SourceRange()); 3031} 3032 3033namespace { 3034 class TypeSpecLocFiller : public TypeLocVisitor<TypeSpecLocFiller> { 3035 ASTContext &Context; 3036 const DeclSpec &DS; 3037 3038 public: 3039 TypeSpecLocFiller(ASTContext &Context, const DeclSpec &DS) 3040 : Context(Context), DS(DS) {} 3041 3042 void VisitAttributedTypeLoc(AttributedTypeLoc TL) { 3043 fillAttributedTypeLoc(TL, DS.getAttributes().getList()); 3044 Visit(TL.getModifiedLoc()); 3045 } 3046 void VisitQualifiedTypeLoc(QualifiedTypeLoc TL) { 3047 Visit(TL.getUnqualifiedLoc()); 3048 } 3049 void VisitTypedefTypeLoc(TypedefTypeLoc TL) { 3050 TL.setNameLoc(DS.getTypeSpecTypeLoc()); 3051 } 3052 void VisitObjCInterfaceTypeLoc(ObjCInterfaceTypeLoc TL) { 3053 TL.setNameLoc(DS.getTypeSpecTypeLoc()); 3054 // FIXME. We should have DS.getTypeSpecTypeEndLoc(). But, it requires 3055 // addition field. What we have is good enough for dispay of location 3056 // of 'fixit' on interface name. 3057 TL.setNameEndLoc(DS.getLocEnd()); 3058 } 3059 void VisitObjCObjectTypeLoc(ObjCObjectTypeLoc TL) { 3060 // Handle the base type, which might not have been written explicitly. 3061 if (DS.getTypeSpecType() == DeclSpec::TST_unspecified) { 3062 TL.setHasBaseTypeAsWritten(false); 3063 TL.getBaseLoc().initialize(Context, SourceLocation()); 3064 } else { 3065 TL.setHasBaseTypeAsWritten(true); 3066 Visit(TL.getBaseLoc()); 3067 } 3068 3069 // Protocol qualifiers. 3070 if (DS.getProtocolQualifiers()) { 3071 assert(TL.getNumProtocols() > 0); 3072 assert(TL.getNumProtocols() == DS.getNumProtocolQualifiers()); 3073 TL.setLAngleLoc(DS.getProtocolLAngleLoc()); 3074 TL.setRAngleLoc(DS.getSourceRange().getEnd()); 3075 for (unsigned i = 0, e = DS.getNumProtocolQualifiers(); i != e; ++i) 3076 TL.setProtocolLoc(i, DS.getProtocolLocs()[i]); 3077 } else { 3078 assert(TL.getNumProtocols() == 0); 3079 TL.setLAngleLoc(SourceLocation()); 3080 TL.setRAngleLoc(SourceLocation()); 3081 } 3082 } 3083 void VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL) { 3084 TL.setStarLoc(SourceLocation()); 3085 Visit(TL.getPointeeLoc()); 3086 } 3087 void VisitTemplateSpecializationTypeLoc(TemplateSpecializationTypeLoc TL) { 3088 TypeSourceInfo *TInfo = 0; 3089 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 3090 3091 // If we got no declarator info from previous Sema routines, 3092 // just fill with the typespec loc. 3093 if (!TInfo) { 3094 TL.initialize(Context, DS.getTypeSpecTypeNameLoc()); 3095 return; 3096 } 3097 3098 TypeLoc OldTL = TInfo->getTypeLoc(); 3099 if (TInfo->getType()->getAs<ElaboratedType>()) { 3100 ElaboratedTypeLoc ElabTL = cast<ElaboratedTypeLoc>(OldTL); 3101 TemplateSpecializationTypeLoc NamedTL = 3102 cast<TemplateSpecializationTypeLoc>(ElabTL.getNamedTypeLoc()); 3103 TL.copy(NamedTL); 3104 } 3105 else 3106 TL.copy(cast<TemplateSpecializationTypeLoc>(OldTL)); 3107 } 3108 void VisitTypeOfExprTypeLoc(TypeOfExprTypeLoc TL) { 3109 assert(DS.getTypeSpecType() == DeclSpec::TST_typeofExpr); 3110 TL.setTypeofLoc(DS.getTypeSpecTypeLoc()); 3111 TL.setParensRange(DS.getTypeofParensRange()); 3112 } 3113 void VisitTypeOfTypeLoc(TypeOfTypeLoc TL) { 3114 assert(DS.getTypeSpecType() == DeclSpec::TST_typeofType); 3115 TL.setTypeofLoc(DS.getTypeSpecTypeLoc()); 3116 TL.setParensRange(DS.getTypeofParensRange()); 3117 assert(DS.getRepAsType()); 3118 TypeSourceInfo *TInfo = 0; 3119 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 3120 TL.setUnderlyingTInfo(TInfo); 3121 } 3122 void VisitUnaryTransformTypeLoc(UnaryTransformTypeLoc TL) { 3123 // FIXME: This holds only because we only have one unary transform. 3124 assert(DS.getTypeSpecType() == DeclSpec::TST_underlyingType); 3125 TL.setKWLoc(DS.getTypeSpecTypeLoc()); 3126 TL.setParensRange(DS.getTypeofParensRange()); 3127 assert(DS.getRepAsType()); 3128 TypeSourceInfo *TInfo = 0; 3129 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 3130 TL.setUnderlyingTInfo(TInfo); 3131 } 3132 void VisitBuiltinTypeLoc(BuiltinTypeLoc TL) { 3133 // By default, use the source location of the type specifier. 3134 TL.setBuiltinLoc(DS.getTypeSpecTypeLoc()); 3135 if (TL.needsExtraLocalData()) { 3136 // Set info for the written builtin specifiers. 3137 TL.getWrittenBuiltinSpecs() = DS.getWrittenBuiltinSpecs(); 3138 // Try to have a meaningful source location. 3139 if (TL.getWrittenSignSpec() != TSS_unspecified) 3140 // Sign spec loc overrides the others (e.g., 'unsigned long'). 3141 TL.setBuiltinLoc(DS.getTypeSpecSignLoc()); 3142 else if (TL.getWrittenWidthSpec() != TSW_unspecified) 3143 // Width spec loc overrides type spec loc (e.g., 'short int'). 3144 TL.setBuiltinLoc(DS.getTypeSpecWidthLoc()); 3145 } 3146 } 3147 void VisitElaboratedTypeLoc(ElaboratedTypeLoc TL) { 3148 ElaboratedTypeKeyword Keyword 3149 = TypeWithKeyword::getKeywordForTypeSpec(DS.getTypeSpecType()); 3150 if (DS.getTypeSpecType() == TST_typename) { 3151 TypeSourceInfo *TInfo = 0; 3152 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 3153 if (TInfo) { 3154 TL.copy(cast<ElaboratedTypeLoc>(TInfo->getTypeLoc())); 3155 return; 3156 } 3157 } 3158 TL.setElaboratedKeywordLoc(Keyword != ETK_None 3159 ? DS.getTypeSpecTypeLoc() 3160 : SourceLocation()); 3161 const CXXScopeSpec& SS = DS.getTypeSpecScope(); 3162 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 3163 Visit(TL.getNextTypeLoc().getUnqualifiedLoc()); 3164 } 3165 void VisitDependentNameTypeLoc(DependentNameTypeLoc TL) { 3166 assert(DS.getTypeSpecType() == TST_typename); 3167 TypeSourceInfo *TInfo = 0; 3168 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 3169 assert(TInfo); 3170 TL.copy(cast<DependentNameTypeLoc>(TInfo->getTypeLoc())); 3171 } 3172 void VisitDependentTemplateSpecializationTypeLoc( 3173 DependentTemplateSpecializationTypeLoc TL) { 3174 assert(DS.getTypeSpecType() == TST_typename); 3175 TypeSourceInfo *TInfo = 0; 3176 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 3177 assert(TInfo); 3178 TL.copy(cast<DependentTemplateSpecializationTypeLoc>( 3179 TInfo->getTypeLoc())); 3180 } 3181 void VisitTagTypeLoc(TagTypeLoc TL) { 3182 TL.setNameLoc(DS.getTypeSpecTypeNameLoc()); 3183 } 3184 void VisitAtomicTypeLoc(AtomicTypeLoc TL) { 3185 TL.setKWLoc(DS.getTypeSpecTypeLoc()); 3186 TL.setParensRange(DS.getTypeofParensRange()); 3187 3188 TypeSourceInfo *TInfo = 0; 3189 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 3190 TL.getValueLoc().initializeFullCopy(TInfo->getTypeLoc()); 3191 } 3192 3193 void VisitTypeLoc(TypeLoc TL) { 3194 // FIXME: add other typespec types and change this to an assert. 3195 TL.initialize(Context, DS.getTypeSpecTypeLoc()); 3196 } 3197 }; 3198 3199 class DeclaratorLocFiller : public TypeLocVisitor<DeclaratorLocFiller> { 3200 ASTContext &Context; 3201 const DeclaratorChunk &Chunk; 3202 3203 public: 3204 DeclaratorLocFiller(ASTContext &Context, const DeclaratorChunk &Chunk) 3205 : Context(Context), Chunk(Chunk) {} 3206 3207 void VisitQualifiedTypeLoc(QualifiedTypeLoc TL) { 3208 llvm_unreachable("qualified type locs not expected here!"); 3209 } 3210 3211 void VisitAttributedTypeLoc(AttributedTypeLoc TL) { 3212 fillAttributedTypeLoc(TL, Chunk.getAttrs()); 3213 } 3214 void VisitBlockPointerTypeLoc(BlockPointerTypeLoc TL) { 3215 assert(Chunk.Kind == DeclaratorChunk::BlockPointer); 3216 TL.setCaretLoc(Chunk.Loc); 3217 } 3218 void VisitPointerTypeLoc(PointerTypeLoc TL) { 3219 assert(Chunk.Kind == DeclaratorChunk::Pointer); 3220 TL.setStarLoc(Chunk.Loc); 3221 } 3222 void VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL) { 3223 assert(Chunk.Kind == DeclaratorChunk::Pointer); 3224 TL.setStarLoc(Chunk.Loc); 3225 } 3226 void VisitMemberPointerTypeLoc(MemberPointerTypeLoc TL) { 3227 assert(Chunk.Kind == DeclaratorChunk::MemberPointer); 3228 const CXXScopeSpec& SS = Chunk.Mem.Scope(); 3229 NestedNameSpecifierLoc NNSLoc = SS.getWithLocInContext(Context); 3230 3231 const Type* ClsTy = TL.getClass(); 3232 QualType ClsQT = QualType(ClsTy, 0); 3233 TypeSourceInfo *ClsTInfo = Context.CreateTypeSourceInfo(ClsQT, 0); 3234 // Now copy source location info into the type loc component. 3235 TypeLoc ClsTL = ClsTInfo->getTypeLoc(); 3236 switch (NNSLoc.getNestedNameSpecifier()->getKind()) { 3237 case NestedNameSpecifier::Identifier: 3238 assert(isa<DependentNameType>(ClsTy) && "Unexpected TypeLoc"); 3239 { 3240 DependentNameTypeLoc DNTLoc = cast<DependentNameTypeLoc>(ClsTL); 3241 DNTLoc.setElaboratedKeywordLoc(SourceLocation()); 3242 DNTLoc.setQualifierLoc(NNSLoc.getPrefix()); 3243 DNTLoc.setNameLoc(NNSLoc.getLocalBeginLoc()); 3244 } 3245 break; 3246 3247 case NestedNameSpecifier::TypeSpec: 3248 case NestedNameSpecifier::TypeSpecWithTemplate: 3249 if (isa<ElaboratedType>(ClsTy)) { 3250 ElaboratedTypeLoc ETLoc = *cast<ElaboratedTypeLoc>(&ClsTL); 3251 ETLoc.setElaboratedKeywordLoc(SourceLocation()); 3252 ETLoc.setQualifierLoc(NNSLoc.getPrefix()); 3253 TypeLoc NamedTL = ETLoc.getNamedTypeLoc(); 3254 NamedTL.initializeFullCopy(NNSLoc.getTypeLoc()); 3255 } else { 3256 ClsTL.initializeFullCopy(NNSLoc.getTypeLoc()); 3257 } 3258 break; 3259 3260 case NestedNameSpecifier::Namespace: 3261 case NestedNameSpecifier::NamespaceAlias: 3262 case NestedNameSpecifier::Global: 3263 llvm_unreachable("Nested-name-specifier must name a type"); 3264 } 3265 3266 // Finally fill in MemberPointerLocInfo fields. 3267 TL.setStarLoc(Chunk.Loc); 3268 TL.setClassTInfo(ClsTInfo); 3269 } 3270 void VisitLValueReferenceTypeLoc(LValueReferenceTypeLoc TL) { 3271 assert(Chunk.Kind == DeclaratorChunk::Reference); 3272 // 'Amp' is misleading: this might have been originally 3273 /// spelled with AmpAmp. 3274 TL.setAmpLoc(Chunk.Loc); 3275 } 3276 void VisitRValueReferenceTypeLoc(RValueReferenceTypeLoc TL) { 3277 assert(Chunk.Kind == DeclaratorChunk::Reference); 3278 assert(!Chunk.Ref.LValueRef); 3279 TL.setAmpAmpLoc(Chunk.Loc); 3280 } 3281 void VisitArrayTypeLoc(ArrayTypeLoc TL) { 3282 assert(Chunk.Kind == DeclaratorChunk::Array); 3283 TL.setLBracketLoc(Chunk.Loc); 3284 TL.setRBracketLoc(Chunk.EndLoc); 3285 TL.setSizeExpr(static_cast<Expr*>(Chunk.Arr.NumElts)); 3286 } 3287 void VisitFunctionTypeLoc(FunctionTypeLoc TL) { 3288 assert(Chunk.Kind == DeclaratorChunk::Function); 3289 TL.setLocalRangeBegin(Chunk.Loc); 3290 TL.setLocalRangeEnd(Chunk.EndLoc); 3291 3292 const DeclaratorChunk::FunctionTypeInfo &FTI = Chunk.Fun; 3293 TL.setLParenLoc(FTI.getLParenLoc()); 3294 TL.setRParenLoc(FTI.getRParenLoc()); 3295 for (unsigned i = 0, e = TL.getNumArgs(), tpi = 0; i != e; ++i) { 3296 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 3297 TL.setArg(tpi++, Param); 3298 } 3299 // FIXME: exception specs 3300 } 3301 void VisitParenTypeLoc(ParenTypeLoc TL) { 3302 assert(Chunk.Kind == DeclaratorChunk::Paren); 3303 TL.setLParenLoc(Chunk.Loc); 3304 TL.setRParenLoc(Chunk.EndLoc); 3305 } 3306 3307 void VisitTypeLoc(TypeLoc TL) { 3308 llvm_unreachable("unsupported TypeLoc kind in declarator!"); 3309 } 3310 }; 3311} 3312 3313/// \brief Create and instantiate a TypeSourceInfo with type source information. 3314/// 3315/// \param T QualType referring to the type as written in source code. 3316/// 3317/// \param ReturnTypeInfo For declarators whose return type does not show 3318/// up in the normal place in the declaration specifiers (such as a C++ 3319/// conversion function), this pointer will refer to a type source information 3320/// for that return type. 3321TypeSourceInfo * 3322Sema::GetTypeSourceInfoForDeclarator(Declarator &D, QualType T, 3323 TypeSourceInfo *ReturnTypeInfo) { 3324 TypeSourceInfo *TInfo = Context.CreateTypeSourceInfo(T); 3325 UnqualTypeLoc CurrTL = TInfo->getTypeLoc().getUnqualifiedLoc(); 3326 3327 // Handle parameter packs whose type is a pack expansion. 3328 if (isa<PackExpansionType>(T)) { 3329 cast<PackExpansionTypeLoc>(CurrTL).setEllipsisLoc(D.getEllipsisLoc()); 3330 CurrTL = CurrTL.getNextTypeLoc().getUnqualifiedLoc(); 3331 } 3332 3333 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 3334 while (isa<AttributedTypeLoc>(CurrTL)) { 3335 AttributedTypeLoc TL = cast<AttributedTypeLoc>(CurrTL); 3336 fillAttributedTypeLoc(TL, D.getTypeObject(i).getAttrs()); 3337 CurrTL = TL.getNextTypeLoc().getUnqualifiedLoc(); 3338 } 3339 3340 DeclaratorLocFiller(Context, D.getTypeObject(i)).Visit(CurrTL); 3341 CurrTL = CurrTL.getNextTypeLoc().getUnqualifiedLoc(); 3342 } 3343 3344 // If we have different source information for the return type, use 3345 // that. This really only applies to C++ conversion functions. 3346 if (ReturnTypeInfo) { 3347 TypeLoc TL = ReturnTypeInfo->getTypeLoc(); 3348 assert(TL.getFullDataSize() == CurrTL.getFullDataSize()); 3349 memcpy(CurrTL.getOpaqueData(), TL.getOpaqueData(), TL.getFullDataSize()); 3350 } else { 3351 TypeSpecLocFiller(Context, D.getDeclSpec()).Visit(CurrTL); 3352 } 3353 3354 return TInfo; 3355} 3356 3357/// \brief Create a LocInfoType to hold the given QualType and TypeSourceInfo. 3358ParsedType Sema::CreateParsedType(QualType T, TypeSourceInfo *TInfo) { 3359 // FIXME: LocInfoTypes are "transient", only needed for passing to/from Parser 3360 // and Sema during declaration parsing. Try deallocating/caching them when 3361 // it's appropriate, instead of allocating them and keeping them around. 3362 LocInfoType *LocT = (LocInfoType*)BumpAlloc.Allocate(sizeof(LocInfoType), 3363 TypeAlignment); 3364 new (LocT) LocInfoType(T, TInfo); 3365 assert(LocT->getTypeClass() != T->getTypeClass() && 3366 "LocInfoType's TypeClass conflicts with an existing Type class"); 3367 return ParsedType::make(QualType(LocT, 0)); 3368} 3369 3370void LocInfoType::getAsStringInternal(std::string &Str, 3371 const PrintingPolicy &Policy) const { 3372 llvm_unreachable("LocInfoType leaked into the type system; an opaque TypeTy*" 3373 " was used directly instead of getting the QualType through" 3374 " GetTypeFromParser"); 3375} 3376 3377TypeResult Sema::ActOnTypeName(Scope *S, Declarator &D) { 3378 // C99 6.7.6: Type names have no identifier. This is already validated by 3379 // the parser. 3380 assert(D.getIdentifier() == 0 && "Type name should have no identifier!"); 3381 3382 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 3383 QualType T = TInfo->getType(); 3384 if (D.isInvalidType()) 3385 return true; 3386 3387 // Make sure there are no unused decl attributes on the declarator. 3388 // We don't want to do this for ObjC parameters because we're going 3389 // to apply them to the actual parameter declaration. 3390 if (D.getContext() != Declarator::ObjCParameterContext) 3391 checkUnusedDeclAttributes(D); 3392 3393 if (getLangOpts().CPlusPlus) { 3394 // Check that there are no default arguments (C++ only). 3395 CheckExtraCXXDefaultArguments(D); 3396 } 3397 3398 return CreateParsedType(T, TInfo); 3399} 3400 3401ParsedType Sema::ActOnObjCInstanceType(SourceLocation Loc) { 3402 QualType T = Context.getObjCInstanceType(); 3403 TypeSourceInfo *TInfo = Context.getTrivialTypeSourceInfo(T, Loc); 3404 return CreateParsedType(T, TInfo); 3405} 3406 3407 3408//===----------------------------------------------------------------------===// 3409// Type Attribute Processing 3410//===----------------------------------------------------------------------===// 3411 3412/// HandleAddressSpaceTypeAttribute - Process an address_space attribute on the 3413/// specified type. The attribute contains 1 argument, the id of the address 3414/// space for the type. 3415static void HandleAddressSpaceTypeAttribute(QualType &Type, 3416 const AttributeList &Attr, Sema &S){ 3417 3418 // If this type is already address space qualified, reject it. 3419 // ISO/IEC TR 18037 S5.3 (amending C99 6.7.3): "No type shall be qualified by 3420 // qualifiers for two or more different address spaces." 3421 if (Type.getAddressSpace()) { 3422 S.Diag(Attr.getLoc(), diag::err_attribute_address_multiple_qualifiers); 3423 Attr.setInvalid(); 3424 return; 3425 } 3426 3427 // ISO/IEC TR 18037 S5.3 (amending C99 6.7.3): "A function type shall not be 3428 // qualified by an address-space qualifier." 3429 if (Type->isFunctionType()) { 3430 S.Diag(Attr.getLoc(), diag::err_attribute_address_function_type); 3431 Attr.setInvalid(); 3432 return; 3433 } 3434 3435 // Check the attribute arguments. 3436 if (Attr.getNumArgs() != 1) { 3437 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 3438 Attr.setInvalid(); 3439 return; 3440 } 3441 Expr *ASArgExpr = static_cast<Expr *>(Attr.getArg(0)); 3442 llvm::APSInt addrSpace(32); 3443 if (ASArgExpr->isTypeDependent() || ASArgExpr->isValueDependent() || 3444 !ASArgExpr->isIntegerConstantExpr(addrSpace, S.Context)) { 3445 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_not_int) 3446 << ASArgExpr->getSourceRange(); 3447 Attr.setInvalid(); 3448 return; 3449 } 3450 3451 // Bounds checking. 3452 if (addrSpace.isSigned()) { 3453 if (addrSpace.isNegative()) { 3454 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_negative) 3455 << ASArgExpr->getSourceRange(); 3456 Attr.setInvalid(); 3457 return; 3458 } 3459 addrSpace.setIsSigned(false); 3460 } 3461 llvm::APSInt max(addrSpace.getBitWidth()); 3462 max = Qualifiers::MaxAddressSpace; 3463 if (addrSpace > max) { 3464 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_too_high) 3465 << Qualifiers::MaxAddressSpace << ASArgExpr->getSourceRange(); 3466 Attr.setInvalid(); 3467 return; 3468 } 3469 3470 unsigned ASIdx = static_cast<unsigned>(addrSpace.getZExtValue()); 3471 Type = S.Context.getAddrSpaceQualType(Type, ASIdx); 3472} 3473 3474/// Does this type have a "direct" ownership qualifier? That is, 3475/// is it written like "__strong id", as opposed to something like 3476/// "typeof(foo)", where that happens to be strong? 3477static bool hasDirectOwnershipQualifier(QualType type) { 3478 // Fast path: no qualifier at all. 3479 assert(type.getQualifiers().hasObjCLifetime()); 3480 3481 while (true) { 3482 // __strong id 3483 if (const AttributedType *attr = dyn_cast<AttributedType>(type)) { 3484 if (attr->getAttrKind() == AttributedType::attr_objc_ownership) 3485 return true; 3486 3487 type = attr->getModifiedType(); 3488 3489 // X *__strong (...) 3490 } else if (const ParenType *paren = dyn_cast<ParenType>(type)) { 3491 type = paren->getInnerType(); 3492 3493 // That's it for things we want to complain about. In particular, 3494 // we do not want to look through typedefs, typeof(expr), 3495 // typeof(type), or any other way that the type is somehow 3496 // abstracted. 3497 } else { 3498 3499 return false; 3500 } 3501 } 3502} 3503 3504/// handleObjCOwnershipTypeAttr - Process an objc_ownership 3505/// attribute on the specified type. 3506/// 3507/// Returns 'true' if the attribute was handled. 3508static bool handleObjCOwnershipTypeAttr(TypeProcessingState &state, 3509 AttributeList &attr, 3510 QualType &type) { 3511 bool NonObjCPointer = false; 3512 3513 if (!type->isDependentType()) { 3514 if (const PointerType *ptr = type->getAs<PointerType>()) { 3515 QualType pointee = ptr->getPointeeType(); 3516 if (pointee->isObjCRetainableType() || pointee->isPointerType()) 3517 return false; 3518 // It is important not to lose the source info that there was an attribute 3519 // applied to non-objc pointer. We will create an attributed type but 3520 // its type will be the same as the original type. 3521 NonObjCPointer = true; 3522 } else if (!type->isObjCRetainableType()) { 3523 return false; 3524 } 3525 } 3526 3527 Sema &S = state.getSema(); 3528 SourceLocation AttrLoc = attr.getLoc(); 3529 if (AttrLoc.isMacroID()) 3530 AttrLoc = S.getSourceManager().getImmediateExpansionRange(AttrLoc).first; 3531 3532 if (!attr.getParameterName()) { 3533 S.Diag(AttrLoc, diag::err_attribute_argument_n_not_string) 3534 << "objc_ownership" << 1; 3535 attr.setInvalid(); 3536 return true; 3537 } 3538 3539 // Consume lifetime attributes without further comment outside of 3540 // ARC mode. 3541 if (!S.getLangOpts().ObjCAutoRefCount) 3542 return true; 3543 3544 Qualifiers::ObjCLifetime lifetime; 3545 if (attr.getParameterName()->isStr("none")) 3546 lifetime = Qualifiers::OCL_ExplicitNone; 3547 else if (attr.getParameterName()->isStr("strong")) 3548 lifetime = Qualifiers::OCL_Strong; 3549 else if (attr.getParameterName()->isStr("weak")) 3550 lifetime = Qualifiers::OCL_Weak; 3551 else if (attr.getParameterName()->isStr("autoreleasing")) 3552 lifetime = Qualifiers::OCL_Autoreleasing; 3553 else { 3554 S.Diag(AttrLoc, diag::warn_attribute_type_not_supported) 3555 << "objc_ownership" << attr.getParameterName(); 3556 attr.setInvalid(); 3557 return true; 3558 } 3559 3560 SplitQualType underlyingType = type.split(); 3561 3562 // Check for redundant/conflicting ownership qualifiers. 3563 if (Qualifiers::ObjCLifetime previousLifetime 3564 = type.getQualifiers().getObjCLifetime()) { 3565 // If it's written directly, that's an error. 3566 if (hasDirectOwnershipQualifier(type)) { 3567 S.Diag(AttrLoc, diag::err_attr_objc_ownership_redundant) 3568 << type; 3569 return true; 3570 } 3571 3572 // Otherwise, if the qualifiers actually conflict, pull sugar off 3573 // until we reach a type that is directly qualified. 3574 if (previousLifetime != lifetime) { 3575 // This should always terminate: the canonical type is 3576 // qualified, so some bit of sugar must be hiding it. 3577 while (!underlyingType.Quals.hasObjCLifetime()) { 3578 underlyingType = underlyingType.getSingleStepDesugaredType(); 3579 } 3580 underlyingType.Quals.removeObjCLifetime(); 3581 } 3582 } 3583 3584 underlyingType.Quals.addObjCLifetime(lifetime); 3585 3586 if (NonObjCPointer) { 3587 StringRef name = attr.getName()->getName(); 3588 switch (lifetime) { 3589 case Qualifiers::OCL_None: 3590 case Qualifiers::OCL_ExplicitNone: 3591 break; 3592 case Qualifiers::OCL_Strong: name = "__strong"; break; 3593 case Qualifiers::OCL_Weak: name = "__weak"; break; 3594 case Qualifiers::OCL_Autoreleasing: name = "__autoreleasing"; break; 3595 } 3596 S.Diag(AttrLoc, diag::warn_objc_object_attribute_wrong_type) 3597 << name << type; 3598 } 3599 3600 QualType origType = type; 3601 if (!NonObjCPointer) 3602 type = S.Context.getQualifiedType(underlyingType); 3603 3604 // If we have a valid source location for the attribute, use an 3605 // AttributedType instead. 3606 if (AttrLoc.isValid()) 3607 type = S.Context.getAttributedType(AttributedType::attr_objc_ownership, 3608 origType, type); 3609 3610 // Forbid __weak if the runtime doesn't support it. 3611 if (lifetime == Qualifiers::OCL_Weak && 3612 !S.getLangOpts().ObjCARCWeak && !NonObjCPointer) { 3613 3614 // Actually, delay this until we know what we're parsing. 3615 if (S.DelayedDiagnostics.shouldDelayDiagnostics()) { 3616 S.DelayedDiagnostics.add( 3617 sema::DelayedDiagnostic::makeForbiddenType( 3618 S.getSourceManager().getExpansionLoc(AttrLoc), 3619 diag::err_arc_weak_no_runtime, type, /*ignored*/ 0)); 3620 } else { 3621 S.Diag(AttrLoc, diag::err_arc_weak_no_runtime); 3622 } 3623 3624 attr.setInvalid(); 3625 return true; 3626 } 3627 3628 // Forbid __weak for class objects marked as 3629 // objc_arc_weak_reference_unavailable 3630 if (lifetime == Qualifiers::OCL_Weak) { 3631 QualType T = type; 3632 while (const PointerType *ptr = T->getAs<PointerType>()) 3633 T = ptr->getPointeeType(); 3634 if (const ObjCObjectPointerType *ObjT = T->getAs<ObjCObjectPointerType>()) { 3635 if (ObjCInterfaceDecl *Class = ObjT->getInterfaceDecl()) { 3636 if (Class->isArcWeakrefUnavailable()) { 3637 S.Diag(AttrLoc, diag::err_arc_unsupported_weak_class); 3638 S.Diag(ObjT->getInterfaceDecl()->getLocation(), 3639 diag::note_class_declared); 3640 } 3641 } 3642 } 3643 } 3644 3645 return true; 3646} 3647 3648/// handleObjCGCTypeAttr - Process the __attribute__((objc_gc)) type 3649/// attribute on the specified type. Returns true to indicate that 3650/// the attribute was handled, false to indicate that the type does 3651/// not permit the attribute. 3652static bool handleObjCGCTypeAttr(TypeProcessingState &state, 3653 AttributeList &attr, 3654 QualType &type) { 3655 Sema &S = state.getSema(); 3656 3657 // Delay if this isn't some kind of pointer. 3658 if (!type->isPointerType() && 3659 !type->isObjCObjectPointerType() && 3660 !type->isBlockPointerType()) 3661 return false; 3662 3663 if (type.getObjCGCAttr() != Qualifiers::GCNone) { 3664 S.Diag(attr.getLoc(), diag::err_attribute_multiple_objc_gc); 3665 attr.setInvalid(); 3666 return true; 3667 } 3668 3669 // Check the attribute arguments. 3670 if (!attr.getParameterName()) { 3671 S.Diag(attr.getLoc(), diag::err_attribute_argument_n_not_string) 3672 << "objc_gc" << 1; 3673 attr.setInvalid(); 3674 return true; 3675 } 3676 Qualifiers::GC GCAttr; 3677 if (attr.getNumArgs() != 0) { 3678 S.Diag(attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 3679 attr.setInvalid(); 3680 return true; 3681 } 3682 if (attr.getParameterName()->isStr("weak")) 3683 GCAttr = Qualifiers::Weak; 3684 else if (attr.getParameterName()->isStr("strong")) 3685 GCAttr = Qualifiers::Strong; 3686 else { 3687 S.Diag(attr.getLoc(), diag::warn_attribute_type_not_supported) 3688 << "objc_gc" << attr.getParameterName(); 3689 attr.setInvalid(); 3690 return true; 3691 } 3692 3693 QualType origType = type; 3694 type = S.Context.getObjCGCQualType(origType, GCAttr); 3695 3696 // Make an attributed type to preserve the source information. 3697 if (attr.getLoc().isValid()) 3698 type = S.Context.getAttributedType(AttributedType::attr_objc_gc, 3699 origType, type); 3700 3701 return true; 3702} 3703 3704namespace { 3705 /// A helper class to unwrap a type down to a function for the 3706 /// purposes of applying attributes there. 3707 /// 3708 /// Use: 3709 /// FunctionTypeUnwrapper unwrapped(SemaRef, T); 3710 /// if (unwrapped.isFunctionType()) { 3711 /// const FunctionType *fn = unwrapped.get(); 3712 /// // change fn somehow 3713 /// T = unwrapped.wrap(fn); 3714 /// } 3715 struct FunctionTypeUnwrapper { 3716 enum WrapKind { 3717 Desugar, 3718 Parens, 3719 Pointer, 3720 BlockPointer, 3721 Reference, 3722 MemberPointer 3723 }; 3724 3725 QualType Original; 3726 const FunctionType *Fn; 3727 SmallVector<unsigned char /*WrapKind*/, 8> Stack; 3728 3729 FunctionTypeUnwrapper(Sema &S, QualType T) : Original(T) { 3730 while (true) { 3731 const Type *Ty = T.getTypePtr(); 3732 if (isa<FunctionType>(Ty)) { 3733 Fn = cast<FunctionType>(Ty); 3734 return; 3735 } else if (isa<ParenType>(Ty)) { 3736 T = cast<ParenType>(Ty)->getInnerType(); 3737 Stack.push_back(Parens); 3738 } else if (isa<PointerType>(Ty)) { 3739 T = cast<PointerType>(Ty)->getPointeeType(); 3740 Stack.push_back(Pointer); 3741 } else if (isa<BlockPointerType>(Ty)) { 3742 T = cast<BlockPointerType>(Ty)->getPointeeType(); 3743 Stack.push_back(BlockPointer); 3744 } else if (isa<MemberPointerType>(Ty)) { 3745 T = cast<MemberPointerType>(Ty)->getPointeeType(); 3746 Stack.push_back(MemberPointer); 3747 } else if (isa<ReferenceType>(Ty)) { 3748 T = cast<ReferenceType>(Ty)->getPointeeType(); 3749 Stack.push_back(Reference); 3750 } else { 3751 const Type *DTy = Ty->getUnqualifiedDesugaredType(); 3752 if (Ty == DTy) { 3753 Fn = 0; 3754 return; 3755 } 3756 3757 T = QualType(DTy, 0); 3758 Stack.push_back(Desugar); 3759 } 3760 } 3761 } 3762 3763 bool isFunctionType() const { return (Fn != 0); } 3764 const FunctionType *get() const { return Fn; } 3765 3766 QualType wrap(Sema &S, const FunctionType *New) { 3767 // If T wasn't modified from the unwrapped type, do nothing. 3768 if (New == get()) return Original; 3769 3770 Fn = New; 3771 return wrap(S.Context, Original, 0); 3772 } 3773 3774 private: 3775 QualType wrap(ASTContext &C, QualType Old, unsigned I) { 3776 if (I == Stack.size()) 3777 return C.getQualifiedType(Fn, Old.getQualifiers()); 3778 3779 // Build up the inner type, applying the qualifiers from the old 3780 // type to the new type. 3781 SplitQualType SplitOld = Old.split(); 3782 3783 // As a special case, tail-recurse if there are no qualifiers. 3784 if (SplitOld.Quals.empty()) 3785 return wrap(C, SplitOld.Ty, I); 3786 return C.getQualifiedType(wrap(C, SplitOld.Ty, I), SplitOld.Quals); 3787 } 3788 3789 QualType wrap(ASTContext &C, const Type *Old, unsigned I) { 3790 if (I == Stack.size()) return QualType(Fn, 0); 3791 3792 switch (static_cast<WrapKind>(Stack[I++])) { 3793 case Desugar: 3794 // This is the point at which we potentially lose source 3795 // information. 3796 return wrap(C, Old->getUnqualifiedDesugaredType(), I); 3797 3798 case Parens: { 3799 QualType New = wrap(C, cast<ParenType>(Old)->getInnerType(), I); 3800 return C.getParenType(New); 3801 } 3802 3803 case Pointer: { 3804 QualType New = wrap(C, cast<PointerType>(Old)->getPointeeType(), I); 3805 return C.getPointerType(New); 3806 } 3807 3808 case BlockPointer: { 3809 QualType New = wrap(C, cast<BlockPointerType>(Old)->getPointeeType(),I); 3810 return C.getBlockPointerType(New); 3811 } 3812 3813 case MemberPointer: { 3814 const MemberPointerType *OldMPT = cast<MemberPointerType>(Old); 3815 QualType New = wrap(C, OldMPT->getPointeeType(), I); 3816 return C.getMemberPointerType(New, OldMPT->getClass()); 3817 } 3818 3819 case Reference: { 3820 const ReferenceType *OldRef = cast<ReferenceType>(Old); 3821 QualType New = wrap(C, OldRef->getPointeeType(), I); 3822 if (isa<LValueReferenceType>(OldRef)) 3823 return C.getLValueReferenceType(New, OldRef->isSpelledAsLValue()); 3824 else 3825 return C.getRValueReferenceType(New); 3826 } 3827 } 3828 3829 llvm_unreachable("unknown wrapping kind"); 3830 } 3831 }; 3832} 3833 3834/// Process an individual function attribute. Returns true to 3835/// indicate that the attribute was handled, false if it wasn't. 3836static bool handleFunctionTypeAttr(TypeProcessingState &state, 3837 AttributeList &attr, 3838 QualType &type) { 3839 Sema &S = state.getSema(); 3840 3841 FunctionTypeUnwrapper unwrapped(S, type); 3842 3843 if (attr.getKind() == AttributeList::AT_NoReturn) { 3844 if (S.CheckNoReturnAttr(attr)) 3845 return true; 3846 3847 // Delay if this is not a function type. 3848 if (!unwrapped.isFunctionType()) 3849 return false; 3850 3851 // Otherwise we can process right away. 3852 FunctionType::ExtInfo EI = unwrapped.get()->getExtInfo().withNoReturn(true); 3853 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 3854 return true; 3855 } 3856 3857 // ns_returns_retained is not always a type attribute, but if we got 3858 // here, we're treating it as one right now. 3859 if (attr.getKind() == AttributeList::AT_NSReturnsRetained) { 3860 assert(S.getLangOpts().ObjCAutoRefCount && 3861 "ns_returns_retained treated as type attribute in non-ARC"); 3862 if (attr.getNumArgs()) return true; 3863 3864 // Delay if this is not a function type. 3865 if (!unwrapped.isFunctionType()) 3866 return false; 3867 3868 FunctionType::ExtInfo EI 3869 = unwrapped.get()->getExtInfo().withProducesResult(true); 3870 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 3871 return true; 3872 } 3873 3874 if (attr.getKind() == AttributeList::AT_Regparm) { 3875 unsigned value; 3876 if (S.CheckRegparmAttr(attr, value)) 3877 return true; 3878 3879 // Delay if this is not a function type. 3880 if (!unwrapped.isFunctionType()) 3881 return false; 3882 3883 // Diagnose regparm with fastcall. 3884 const FunctionType *fn = unwrapped.get(); 3885 CallingConv CC = fn->getCallConv(); 3886 if (CC == CC_X86FastCall) { 3887 S.Diag(attr.getLoc(), diag::err_attributes_are_not_compatible) 3888 << FunctionType::getNameForCallConv(CC) 3889 << "regparm"; 3890 attr.setInvalid(); 3891 return true; 3892 } 3893 3894 FunctionType::ExtInfo EI = 3895 unwrapped.get()->getExtInfo().withRegParm(value); 3896 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 3897 return true; 3898 } 3899 3900 // Delay if the type didn't work out to a function. 3901 if (!unwrapped.isFunctionType()) return false; 3902 3903 // Otherwise, a calling convention. 3904 CallingConv CC; 3905 if (S.CheckCallingConvAttr(attr, CC)) 3906 return true; 3907 3908 const FunctionType *fn = unwrapped.get(); 3909 CallingConv CCOld = fn->getCallConv(); 3910 if (S.Context.getCanonicalCallConv(CC) == 3911 S.Context.getCanonicalCallConv(CCOld)) { 3912 FunctionType::ExtInfo EI= unwrapped.get()->getExtInfo().withCallingConv(CC); 3913 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 3914 return true; 3915 } 3916 3917 if (CCOld != (S.LangOpts.MRTD ? CC_X86StdCall : CC_Default)) { 3918 // Should we diagnose reapplications of the same convention? 3919 S.Diag(attr.getLoc(), diag::err_attributes_are_not_compatible) 3920 << FunctionType::getNameForCallConv(CC) 3921 << FunctionType::getNameForCallConv(CCOld); 3922 attr.setInvalid(); 3923 return true; 3924 } 3925 3926 // Diagnose the use of X86 fastcall on varargs or unprototyped functions. 3927 if (CC == CC_X86FastCall) { 3928 if (isa<FunctionNoProtoType>(fn)) { 3929 S.Diag(attr.getLoc(), diag::err_cconv_knr) 3930 << FunctionType::getNameForCallConv(CC); 3931 attr.setInvalid(); 3932 return true; 3933 } 3934 3935 const FunctionProtoType *FnP = cast<FunctionProtoType>(fn); 3936 if (FnP->isVariadic()) { 3937 S.Diag(attr.getLoc(), diag::err_cconv_varargs) 3938 << FunctionType::getNameForCallConv(CC); 3939 attr.setInvalid(); 3940 return true; 3941 } 3942 3943 // Also diagnose fastcall with regparm. 3944 if (fn->getHasRegParm()) { 3945 S.Diag(attr.getLoc(), diag::err_attributes_are_not_compatible) 3946 << "regparm" 3947 << FunctionType::getNameForCallConv(CC); 3948 attr.setInvalid(); 3949 return true; 3950 } 3951 } 3952 3953 FunctionType::ExtInfo EI = unwrapped.get()->getExtInfo().withCallingConv(CC); 3954 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 3955 return true; 3956} 3957 3958/// Handle OpenCL image access qualifiers: read_only, write_only, read_write 3959static void HandleOpenCLImageAccessAttribute(QualType& CurType, 3960 const AttributeList &Attr, 3961 Sema &S) { 3962 // Check the attribute arguments. 3963 if (Attr.getNumArgs() != 1) { 3964 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 3965 Attr.setInvalid(); 3966 return; 3967 } 3968 Expr *sizeExpr = static_cast<Expr *>(Attr.getArg(0)); 3969 llvm::APSInt arg(32); 3970 if (sizeExpr->isTypeDependent() || sizeExpr->isValueDependent() || 3971 !sizeExpr->isIntegerConstantExpr(arg, S.Context)) { 3972 S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int) 3973 << "opencl_image_access" << sizeExpr->getSourceRange(); 3974 Attr.setInvalid(); 3975 return; 3976 } 3977 unsigned iarg = static_cast<unsigned>(arg.getZExtValue()); 3978 switch (iarg) { 3979 case CLIA_read_only: 3980 case CLIA_write_only: 3981 case CLIA_read_write: 3982 // Implemented in a separate patch 3983 break; 3984 default: 3985 // Implemented in a separate patch 3986 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_size) 3987 << sizeExpr->getSourceRange(); 3988 Attr.setInvalid(); 3989 break; 3990 } 3991} 3992 3993/// HandleVectorSizeAttribute - this attribute is only applicable to integral 3994/// and float scalars, although arrays, pointers, and function return values are 3995/// allowed in conjunction with this construct. Aggregates with this attribute 3996/// are invalid, even if they are of the same size as a corresponding scalar. 3997/// The raw attribute should contain precisely 1 argument, the vector size for 3998/// the variable, measured in bytes. If curType and rawAttr are well formed, 3999/// this routine will return a new vector type. 4000static void HandleVectorSizeAttr(QualType& CurType, const AttributeList &Attr, 4001 Sema &S) { 4002 // Check the attribute arguments. 4003 if (Attr.getNumArgs() != 1) { 4004 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 4005 Attr.setInvalid(); 4006 return; 4007 } 4008 Expr *sizeExpr = static_cast<Expr *>(Attr.getArg(0)); 4009 llvm::APSInt vecSize(32); 4010 if (sizeExpr->isTypeDependent() || sizeExpr->isValueDependent() || 4011 !sizeExpr->isIntegerConstantExpr(vecSize, S.Context)) { 4012 S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int) 4013 << "vector_size" << sizeExpr->getSourceRange(); 4014 Attr.setInvalid(); 4015 return; 4016 } 4017 // the base type must be integer or float, and can't already be a vector. 4018 if (!CurType->isIntegerType() && !CurType->isRealFloatingType()) { 4019 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_vector_type) << CurType; 4020 Attr.setInvalid(); 4021 return; 4022 } 4023 unsigned typeSize = static_cast<unsigned>(S.Context.getTypeSize(CurType)); 4024 // vecSize is specified in bytes - convert to bits. 4025 unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue() * 8); 4026 4027 // the vector size needs to be an integral multiple of the type size. 4028 if (vectorSize % typeSize) { 4029 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_size) 4030 << sizeExpr->getSourceRange(); 4031 Attr.setInvalid(); 4032 return; 4033 } 4034 if (vectorSize == 0) { 4035 S.Diag(Attr.getLoc(), diag::err_attribute_zero_size) 4036 << sizeExpr->getSourceRange(); 4037 Attr.setInvalid(); 4038 return; 4039 } 4040 4041 // Success! Instantiate the vector type, the number of elements is > 0, and 4042 // not required to be a power of 2, unlike GCC. 4043 CurType = S.Context.getVectorType(CurType, vectorSize/typeSize, 4044 VectorType::GenericVector); 4045} 4046 4047/// \brief Process the OpenCL-like ext_vector_type attribute when it occurs on 4048/// a type. 4049static void HandleExtVectorTypeAttr(QualType &CurType, 4050 const AttributeList &Attr, 4051 Sema &S) { 4052 Expr *sizeExpr; 4053 4054 // Special case where the argument is a template id. 4055 if (Attr.getParameterName()) { 4056 CXXScopeSpec SS; 4057 SourceLocation TemplateKWLoc; 4058 UnqualifiedId id; 4059 id.setIdentifier(Attr.getParameterName(), Attr.getLoc()); 4060 4061 ExprResult Size = S.ActOnIdExpression(S.getCurScope(), SS, TemplateKWLoc, 4062 id, false, false); 4063 if (Size.isInvalid()) 4064 return; 4065 4066 sizeExpr = Size.get(); 4067 } else { 4068 // check the attribute arguments. 4069 if (Attr.getNumArgs() != 1) { 4070 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 4071 return; 4072 } 4073 sizeExpr = Attr.getArg(0); 4074 } 4075 4076 // Create the vector type. 4077 QualType T = S.BuildExtVectorType(CurType, sizeExpr, Attr.getLoc()); 4078 if (!T.isNull()) 4079 CurType = T; 4080} 4081 4082/// HandleNeonVectorTypeAttr - The "neon_vector_type" and 4083/// "neon_polyvector_type" attributes are used to create vector types that 4084/// are mangled according to ARM's ABI. Otherwise, these types are identical 4085/// to those created with the "vector_size" attribute. Unlike "vector_size" 4086/// the argument to these Neon attributes is the number of vector elements, 4087/// not the vector size in bytes. The vector width and element type must 4088/// match one of the standard Neon vector types. 4089static void HandleNeonVectorTypeAttr(QualType& CurType, 4090 const AttributeList &Attr, Sema &S, 4091 VectorType::VectorKind VecKind, 4092 const char *AttrName) { 4093 // Check the attribute arguments. 4094 if (Attr.getNumArgs() != 1) { 4095 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 4096 Attr.setInvalid(); 4097 return; 4098 } 4099 // The number of elements must be an ICE. 4100 Expr *numEltsExpr = static_cast<Expr *>(Attr.getArg(0)); 4101 llvm::APSInt numEltsInt(32); 4102 if (numEltsExpr->isTypeDependent() || numEltsExpr->isValueDependent() || 4103 !numEltsExpr->isIntegerConstantExpr(numEltsInt, S.Context)) { 4104 S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int) 4105 << AttrName << numEltsExpr->getSourceRange(); 4106 Attr.setInvalid(); 4107 return; 4108 } 4109 // Only certain element types are supported for Neon vectors. 4110 const BuiltinType* BTy = CurType->getAs<BuiltinType>(); 4111 if (!BTy || 4112 (VecKind == VectorType::NeonPolyVector && 4113 BTy->getKind() != BuiltinType::SChar && 4114 BTy->getKind() != BuiltinType::Short) || 4115 (BTy->getKind() != BuiltinType::SChar && 4116 BTy->getKind() != BuiltinType::UChar && 4117 BTy->getKind() != BuiltinType::Short && 4118 BTy->getKind() != BuiltinType::UShort && 4119 BTy->getKind() != BuiltinType::Int && 4120 BTy->getKind() != BuiltinType::UInt && 4121 BTy->getKind() != BuiltinType::LongLong && 4122 BTy->getKind() != BuiltinType::ULongLong && 4123 BTy->getKind() != BuiltinType::Float)) { 4124 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_vector_type) <<CurType; 4125 Attr.setInvalid(); 4126 return; 4127 } 4128 // The total size of the vector must be 64 or 128 bits. 4129 unsigned typeSize = static_cast<unsigned>(S.Context.getTypeSize(CurType)); 4130 unsigned numElts = static_cast<unsigned>(numEltsInt.getZExtValue()); 4131 unsigned vecSize = typeSize * numElts; 4132 if (vecSize != 64 && vecSize != 128) { 4133 S.Diag(Attr.getLoc(), diag::err_attribute_bad_neon_vector_size) << CurType; 4134 Attr.setInvalid(); 4135 return; 4136 } 4137 4138 CurType = S.Context.getVectorType(CurType, numElts, VecKind); 4139} 4140 4141static void processTypeAttrs(TypeProcessingState &state, QualType &type, 4142 bool isDeclSpec, AttributeList *attrs) { 4143 // Scan through and apply attributes to this type where it makes sense. Some 4144 // attributes (such as __address_space__, __vector_size__, etc) apply to the 4145 // type, but others can be present in the type specifiers even though they 4146 // apply to the decl. Here we apply type attributes and ignore the rest. 4147 4148 AttributeList *next; 4149 do { 4150 AttributeList &attr = *attrs; 4151 next = attr.getNext(); 4152 4153 // Skip attributes that were marked to be invalid. 4154 if (attr.isInvalid()) 4155 continue; 4156 4157 // If this is an attribute we can handle, do so now, 4158 // otherwise, add it to the FnAttrs list for rechaining. 4159 switch (attr.getKind()) { 4160 default: break; 4161 4162 case AttributeList::AT_MayAlias: 4163 // FIXME: This attribute needs to actually be handled, but if we ignore 4164 // it it breaks large amounts of Linux software. 4165 attr.setUsedAsTypeAttr(); 4166 break; 4167 case AttributeList::AT_AddressSpace: 4168 HandleAddressSpaceTypeAttribute(type, attr, state.getSema()); 4169 attr.setUsedAsTypeAttr(); 4170 break; 4171 OBJC_POINTER_TYPE_ATTRS_CASELIST: 4172 if (!handleObjCPointerTypeAttr(state, attr, type)) 4173 distributeObjCPointerTypeAttr(state, attr, type); 4174 attr.setUsedAsTypeAttr(); 4175 break; 4176 case AttributeList::AT_VectorSize: 4177 HandleVectorSizeAttr(type, attr, state.getSema()); 4178 attr.setUsedAsTypeAttr(); 4179 break; 4180 case AttributeList::AT_ExtVectorType: 4181 if (state.getDeclarator().getDeclSpec().getStorageClassSpec() 4182 != DeclSpec::SCS_typedef) 4183 HandleExtVectorTypeAttr(type, attr, state.getSema()); 4184 attr.setUsedAsTypeAttr(); 4185 break; 4186 case AttributeList::AT_NeonVectorType: 4187 HandleNeonVectorTypeAttr(type, attr, state.getSema(), 4188 VectorType::NeonVector, "neon_vector_type"); 4189 attr.setUsedAsTypeAttr(); 4190 break; 4191 case AttributeList::AT_NeonPolyVectorType: 4192 HandleNeonVectorTypeAttr(type, attr, state.getSema(), 4193 VectorType::NeonPolyVector, 4194 "neon_polyvector_type"); 4195 attr.setUsedAsTypeAttr(); 4196 break; 4197 case AttributeList::AT_OpenCLImageAccess: 4198 HandleOpenCLImageAccessAttribute(type, attr, state.getSema()); 4199 attr.setUsedAsTypeAttr(); 4200 break; 4201 4202 case AttributeList::AT_Win64: 4203 case AttributeList::AT_Ptr32: 4204 case AttributeList::AT_Ptr64: 4205 // FIXME: don't ignore these 4206 attr.setUsedAsTypeAttr(); 4207 break; 4208 4209 case AttributeList::AT_NSReturnsRetained: 4210 if (!state.getSema().getLangOpts().ObjCAutoRefCount) 4211 break; 4212 // fallthrough into the function attrs 4213 4214 FUNCTION_TYPE_ATTRS_CASELIST: 4215 attr.setUsedAsTypeAttr(); 4216 4217 // Never process function type attributes as part of the 4218 // declaration-specifiers. 4219 if (isDeclSpec) 4220 distributeFunctionTypeAttrFromDeclSpec(state, attr, type); 4221 4222 // Otherwise, handle the possible delays. 4223 else if (!handleFunctionTypeAttr(state, attr, type)) 4224 distributeFunctionTypeAttr(state, attr, type); 4225 break; 4226 } 4227 } while ((attrs = next)); 4228} 4229 4230/// \brief Ensure that the type of the given expression is complete. 4231/// 4232/// This routine checks whether the expression \p E has a complete type. If the 4233/// expression refers to an instantiable construct, that instantiation is 4234/// performed as needed to complete its type. Furthermore 4235/// Sema::RequireCompleteType is called for the expression's type (or in the 4236/// case of a reference type, the referred-to type). 4237/// 4238/// \param E The expression whose type is required to be complete. 4239/// \param Diagnoser The object that will emit a diagnostic if the type is 4240/// incomplete. 4241/// 4242/// \returns \c true if the type of \p E is incomplete and diagnosed, \c false 4243/// otherwise. 4244bool Sema::RequireCompleteExprType(Expr *E, TypeDiagnoser &Diagnoser){ 4245 QualType T = E->getType(); 4246 4247 // Fast path the case where the type is already complete. 4248 if (!T->isIncompleteType()) 4249 return false; 4250 4251 // Incomplete array types may be completed by the initializer attached to 4252 // their definitions. For static data members of class templates we need to 4253 // instantiate the definition to get this initializer and complete the type. 4254 if (T->isIncompleteArrayType()) { 4255 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E->IgnoreParens())) { 4256 if (VarDecl *Var = dyn_cast<VarDecl>(DRE->getDecl())) { 4257 if (Var->isStaticDataMember() && 4258 Var->getInstantiatedFromStaticDataMember()) { 4259 4260 MemberSpecializationInfo *MSInfo = Var->getMemberSpecializationInfo(); 4261 assert(MSInfo && "Missing member specialization information?"); 4262 if (MSInfo->getTemplateSpecializationKind() 4263 != TSK_ExplicitSpecialization) { 4264 // If we don't already have a point of instantiation, this is it. 4265 if (MSInfo->getPointOfInstantiation().isInvalid()) { 4266 MSInfo->setPointOfInstantiation(E->getLocStart()); 4267 4268 // This is a modification of an existing AST node. Notify 4269 // listeners. 4270 if (ASTMutationListener *L = getASTMutationListener()) 4271 L->StaticDataMemberInstantiated(Var); 4272 } 4273 4274 InstantiateStaticDataMemberDefinition(E->getExprLoc(), Var); 4275 4276 // Update the type to the newly instantiated definition's type both 4277 // here and within the expression. 4278 if (VarDecl *Def = Var->getDefinition()) { 4279 DRE->setDecl(Def); 4280 T = Def->getType(); 4281 DRE->setType(T); 4282 E->setType(T); 4283 } 4284 } 4285 4286 // We still go on to try to complete the type independently, as it 4287 // may also require instantiations or diagnostics if it remains 4288 // incomplete. 4289 } 4290 } 4291 } 4292 } 4293 4294 // FIXME: Are there other cases which require instantiating something other 4295 // than the type to complete the type of an expression? 4296 4297 // Look through reference types and complete the referred type. 4298 if (const ReferenceType *Ref = T->getAs<ReferenceType>()) 4299 T = Ref->getPointeeType(); 4300 4301 return RequireCompleteType(E->getExprLoc(), T, Diagnoser); 4302} 4303 4304namespace { 4305 struct TypeDiagnoserDiag : Sema::TypeDiagnoser { 4306 unsigned DiagID; 4307 4308 TypeDiagnoserDiag(unsigned DiagID) 4309 : Sema::TypeDiagnoser(DiagID == 0), DiagID(DiagID) {} 4310 4311 virtual void diagnose(Sema &S, SourceLocation Loc, QualType T) { 4312 if (Suppressed) return; 4313 S.Diag(Loc, DiagID) << T; 4314 } 4315 }; 4316} 4317 4318bool Sema::RequireCompleteExprType(Expr *E, unsigned DiagID) { 4319 TypeDiagnoserDiag Diagnoser(DiagID); 4320 return RequireCompleteExprType(E, Diagnoser); 4321} 4322 4323/// @brief Ensure that the type T is a complete type. 4324/// 4325/// This routine checks whether the type @p T is complete in any 4326/// context where a complete type is required. If @p T is a complete 4327/// type, returns false. If @p T is a class template specialization, 4328/// this routine then attempts to perform class template 4329/// instantiation. If instantiation fails, or if @p T is incomplete 4330/// and cannot be completed, issues the diagnostic @p diag (giving it 4331/// the type @p T) and returns true. 4332/// 4333/// @param Loc The location in the source that the incomplete type 4334/// diagnostic should refer to. 4335/// 4336/// @param T The type that this routine is examining for completeness. 4337/// 4338/// @returns @c true if @p T is incomplete and a diagnostic was emitted, 4339/// @c false otherwise. 4340bool Sema::RequireCompleteType(SourceLocation Loc, QualType T, 4341 TypeDiagnoser &Diagnoser) { 4342 // FIXME: Add this assertion to make sure we always get instantiation points. 4343 // assert(!Loc.isInvalid() && "Invalid location in RequireCompleteType"); 4344 // FIXME: Add this assertion to help us flush out problems with 4345 // checking for dependent types and type-dependent expressions. 4346 // 4347 // assert(!T->isDependentType() && 4348 // "Can't ask whether a dependent type is complete"); 4349 4350 // If we have a complete type, we're done. 4351 NamedDecl *Def = 0; 4352 if (!T->isIncompleteType(&Def)) { 4353 // If we know about the definition but it is not visible, complain. 4354 if (!Diagnoser.Suppressed && Def && !LookupResult::isVisible(Def)) { 4355 // Suppress this error outside of a SFINAE context if we've already 4356 // emitted the error once for this type. There's no usefulness in 4357 // repeating the diagnostic. 4358 // FIXME: Add a Fix-It that imports the corresponding module or includes 4359 // the header. 4360 if (isSFINAEContext() || HiddenDefinitions.insert(Def)) { 4361 Diag(Loc, diag::err_module_private_definition) << T; 4362 Diag(Def->getLocation(), diag::note_previous_definition); 4363 } 4364 } 4365 4366 return false; 4367 } 4368 4369 const TagType *Tag = T->getAs<TagType>(); 4370 const ObjCInterfaceType *IFace = 0; 4371 4372 if (Tag) { 4373 // Avoid diagnosing invalid decls as incomplete. 4374 if (Tag->getDecl()->isInvalidDecl()) 4375 return true; 4376 4377 // Give the external AST source a chance to complete the type. 4378 if (Tag->getDecl()->hasExternalLexicalStorage()) { 4379 Context.getExternalSource()->CompleteType(Tag->getDecl()); 4380 if (!Tag->isIncompleteType()) 4381 return false; 4382 } 4383 } 4384 else if ((IFace = T->getAs<ObjCInterfaceType>())) { 4385 // Avoid diagnosing invalid decls as incomplete. 4386 if (IFace->getDecl()->isInvalidDecl()) 4387 return true; 4388 4389 // Give the external AST source a chance to complete the type. 4390 if (IFace->getDecl()->hasExternalLexicalStorage()) { 4391 Context.getExternalSource()->CompleteType(IFace->getDecl()); 4392 if (!IFace->isIncompleteType()) 4393 return false; 4394 } 4395 } 4396 4397 // If we have a class template specialization or a class member of a 4398 // class template specialization, or an array with known size of such, 4399 // try to instantiate it. 4400 QualType MaybeTemplate = T; 4401 while (const ConstantArrayType *Array 4402 = Context.getAsConstantArrayType(MaybeTemplate)) 4403 MaybeTemplate = Array->getElementType(); 4404 if (const RecordType *Record = MaybeTemplate->getAs<RecordType>()) { 4405 if (ClassTemplateSpecializationDecl *ClassTemplateSpec 4406 = dyn_cast<ClassTemplateSpecializationDecl>(Record->getDecl())) { 4407 if (ClassTemplateSpec->getSpecializationKind() == TSK_Undeclared) 4408 return InstantiateClassTemplateSpecialization(Loc, ClassTemplateSpec, 4409 TSK_ImplicitInstantiation, 4410 /*Complain=*/!Diagnoser.Suppressed); 4411 } else if (CXXRecordDecl *Rec 4412 = dyn_cast<CXXRecordDecl>(Record->getDecl())) { 4413 CXXRecordDecl *Pattern = Rec->getInstantiatedFromMemberClass(); 4414 if (!Rec->isBeingDefined() && Pattern) { 4415 MemberSpecializationInfo *MSI = Rec->getMemberSpecializationInfo(); 4416 assert(MSI && "Missing member specialization information?"); 4417 // This record was instantiated from a class within a template. 4418 if (MSI->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 4419 return InstantiateClass(Loc, Rec, Pattern, 4420 getTemplateInstantiationArgs(Rec), 4421 TSK_ImplicitInstantiation, 4422 /*Complain=*/!Diagnoser.Suppressed); 4423 } 4424 } 4425 } 4426 4427 if (Diagnoser.Suppressed) 4428 return true; 4429 4430 // We have an incomplete type. Produce a diagnostic. 4431 Diagnoser.diagnose(*this, Loc, T); 4432 4433 // If the type was a forward declaration of a class/struct/union 4434 // type, produce a note. 4435 if (Tag && !Tag->getDecl()->isInvalidDecl()) 4436 Diag(Tag->getDecl()->getLocation(), 4437 Tag->isBeingDefined() ? diag::note_type_being_defined 4438 : diag::note_forward_declaration) 4439 << QualType(Tag, 0); 4440 4441 // If the Objective-C class was a forward declaration, produce a note. 4442 if (IFace && !IFace->getDecl()->isInvalidDecl()) 4443 Diag(IFace->getDecl()->getLocation(), diag::note_forward_class); 4444 4445 return true; 4446} 4447 4448bool Sema::RequireCompleteType(SourceLocation Loc, QualType T, 4449 unsigned DiagID) { 4450 TypeDiagnoserDiag Diagnoser(DiagID); 4451 return RequireCompleteType(Loc, T, Diagnoser); 4452} 4453 4454/// \brief Get diagnostic %select index for tag kind for 4455/// literal type diagnostic message. 4456/// WARNING: Indexes apply to particular diagnostics only! 4457/// 4458/// \returns diagnostic %select index. 4459static unsigned getLiteralDiagFromTagKind(TagTypeKind Tag) { 4460 switch (Tag) { 4461 case TTK_Struct: return 0; 4462 case TTK_Interface: return 1; 4463 case TTK_Class: return 2; 4464 default: llvm_unreachable("Invalid tag kind for literal type diagnostic!"); 4465 } 4466} 4467 4468/// @brief Ensure that the type T is a literal type. 4469/// 4470/// This routine checks whether the type @p T is a literal type. If @p T is an 4471/// incomplete type, an attempt is made to complete it. If @p T is a literal 4472/// type, or @p AllowIncompleteType is true and @p T is an incomplete type, 4473/// returns false. Otherwise, this routine issues the diagnostic @p PD (giving 4474/// it the type @p T), along with notes explaining why the type is not a 4475/// literal type, and returns true. 4476/// 4477/// @param Loc The location in the source that the non-literal type 4478/// diagnostic should refer to. 4479/// 4480/// @param T The type that this routine is examining for literalness. 4481/// 4482/// @param Diagnoser Emits a diagnostic if T is not a literal type. 4483/// 4484/// @returns @c true if @p T is not a literal type and a diagnostic was emitted, 4485/// @c false otherwise. 4486bool Sema::RequireLiteralType(SourceLocation Loc, QualType T, 4487 TypeDiagnoser &Diagnoser) { 4488 assert(!T->isDependentType() && "type should not be dependent"); 4489 4490 QualType ElemType = Context.getBaseElementType(T); 4491 RequireCompleteType(Loc, ElemType, 0); 4492 4493 if (T->isLiteralType()) 4494 return false; 4495 4496 if (Diagnoser.Suppressed) 4497 return true; 4498 4499 Diagnoser.diagnose(*this, Loc, T); 4500 4501 if (T->isVariableArrayType()) 4502 return true; 4503 4504 const RecordType *RT = ElemType->getAs<RecordType>(); 4505 if (!RT) 4506 return true; 4507 4508 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 4509 4510 // A partially-defined class type can't be a literal type, because a literal 4511 // class type must have a trivial destructor (which can't be checked until 4512 // the class definition is complete). 4513 if (!RD->isCompleteDefinition()) { 4514 RequireCompleteType(Loc, ElemType, diag::note_non_literal_incomplete, T); 4515 return true; 4516 } 4517 4518 // If the class has virtual base classes, then it's not an aggregate, and 4519 // cannot have any constexpr constructors or a trivial default constructor, 4520 // so is non-literal. This is better to diagnose than the resulting absence 4521 // of constexpr constructors. 4522 if (RD->getNumVBases()) { 4523 Diag(RD->getLocation(), diag::note_non_literal_virtual_base) 4524 << getLiteralDiagFromTagKind(RD->getTagKind()) << RD->getNumVBases(); 4525 for (CXXRecordDecl::base_class_const_iterator I = RD->vbases_begin(), 4526 E = RD->vbases_end(); I != E; ++I) 4527 Diag(I->getLocStart(), 4528 diag::note_constexpr_virtual_base_here) << I->getSourceRange(); 4529 } else if (!RD->isAggregate() && !RD->hasConstexprNonCopyMoveConstructor() && 4530 !RD->hasTrivialDefaultConstructor()) { 4531 Diag(RD->getLocation(), diag::note_non_literal_no_constexpr_ctors) << RD; 4532 } else if (RD->hasNonLiteralTypeFieldsOrBases()) { 4533 for (CXXRecordDecl::base_class_const_iterator I = RD->bases_begin(), 4534 E = RD->bases_end(); I != E; ++I) { 4535 if (!I->getType()->isLiteralType()) { 4536 Diag(I->getLocStart(), 4537 diag::note_non_literal_base_class) 4538 << RD << I->getType() << I->getSourceRange(); 4539 return true; 4540 } 4541 } 4542 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 4543 E = RD->field_end(); I != E; ++I) { 4544 if (!I->getType()->isLiteralType() || 4545 I->getType().isVolatileQualified()) { 4546 Diag(I->getLocation(), diag::note_non_literal_field) 4547 << RD << *I << I->getType() 4548 << I->getType().isVolatileQualified(); 4549 return true; 4550 } 4551 } 4552 } else if (!RD->hasTrivialDestructor()) { 4553 // All fields and bases are of literal types, so have trivial destructors. 4554 // If this class's destructor is non-trivial it must be user-declared. 4555 CXXDestructorDecl *Dtor = RD->getDestructor(); 4556 assert(Dtor && "class has literal fields and bases but no dtor?"); 4557 if (!Dtor) 4558 return true; 4559 4560 Diag(Dtor->getLocation(), Dtor->isUserProvided() ? 4561 diag::note_non_literal_user_provided_dtor : 4562 diag::note_non_literal_nontrivial_dtor) << RD; 4563 } 4564 4565 return true; 4566} 4567 4568bool Sema::RequireLiteralType(SourceLocation Loc, QualType T, unsigned DiagID) { 4569 TypeDiagnoserDiag Diagnoser(DiagID); 4570 return RequireLiteralType(Loc, T, Diagnoser); 4571} 4572 4573/// \brief Retrieve a version of the type 'T' that is elaborated by Keyword 4574/// and qualified by the nested-name-specifier contained in SS. 4575QualType Sema::getElaboratedType(ElaboratedTypeKeyword Keyword, 4576 const CXXScopeSpec &SS, QualType T) { 4577 if (T.isNull()) 4578 return T; 4579 NestedNameSpecifier *NNS; 4580 if (SS.isValid()) 4581 NNS = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 4582 else { 4583 if (Keyword == ETK_None) 4584 return T; 4585 NNS = 0; 4586 } 4587 return Context.getElaboratedType(Keyword, NNS, T); 4588} 4589 4590QualType Sema::BuildTypeofExprType(Expr *E, SourceLocation Loc) { 4591 ExprResult ER = CheckPlaceholderExpr(E); 4592 if (ER.isInvalid()) return QualType(); 4593 E = ER.take(); 4594 4595 if (!E->isTypeDependent()) { 4596 QualType T = E->getType(); 4597 if (const TagType *TT = T->getAs<TagType>()) 4598 DiagnoseUseOfDecl(TT->getDecl(), E->getExprLoc()); 4599 } 4600 return Context.getTypeOfExprType(E); 4601} 4602 4603/// getDecltypeForExpr - Given an expr, will return the decltype for 4604/// that expression, according to the rules in C++11 4605/// [dcl.type.simple]p4 and C++11 [expr.lambda.prim]p18. 4606static QualType getDecltypeForExpr(Sema &S, Expr *E) { 4607 if (E->isTypeDependent()) 4608 return S.Context.DependentTy; 4609 4610 // C++11 [dcl.type.simple]p4: 4611 // The type denoted by decltype(e) is defined as follows: 4612 // 4613 // - if e is an unparenthesized id-expression or an unparenthesized class 4614 // member access (5.2.5), decltype(e) is the type of the entity named 4615 // by e. If there is no such entity, or if e names a set of overloaded 4616 // functions, the program is ill-formed; 4617 // 4618 // We apply the same rules for Objective-C ivar and property references. 4619 if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E)) { 4620 if (const ValueDecl *VD = dyn_cast<ValueDecl>(DRE->getDecl())) 4621 return VD->getType(); 4622 } else if (const MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 4623 if (const FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl())) 4624 return FD->getType(); 4625 } else if (const ObjCIvarRefExpr *IR = dyn_cast<ObjCIvarRefExpr>(E)) { 4626 return IR->getDecl()->getType(); 4627 } else if (const ObjCPropertyRefExpr *PR = dyn_cast<ObjCPropertyRefExpr>(E)) { 4628 if (PR->isExplicitProperty()) 4629 return PR->getExplicitProperty()->getType(); 4630 } 4631 4632 // C++11 [expr.lambda.prim]p18: 4633 // Every occurrence of decltype((x)) where x is a possibly 4634 // parenthesized id-expression that names an entity of automatic 4635 // storage duration is treated as if x were transformed into an 4636 // access to a corresponding data member of the closure type that 4637 // would have been declared if x were an odr-use of the denoted 4638 // entity. 4639 using namespace sema; 4640 if (S.getCurLambda()) { 4641 if (isa<ParenExpr>(E)) { 4642 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E->IgnoreParens())) { 4643 if (VarDecl *Var = dyn_cast<VarDecl>(DRE->getDecl())) { 4644 QualType T = S.getCapturedDeclRefType(Var, DRE->getLocation()); 4645 if (!T.isNull()) 4646 return S.Context.getLValueReferenceType(T); 4647 } 4648 } 4649 } 4650 } 4651 4652 4653 // C++11 [dcl.type.simple]p4: 4654 // [...] 4655 QualType T = E->getType(); 4656 switch (E->getValueKind()) { 4657 // - otherwise, if e is an xvalue, decltype(e) is T&&, where T is the 4658 // type of e; 4659 case VK_XValue: T = S.Context.getRValueReferenceType(T); break; 4660 // - otherwise, if e is an lvalue, decltype(e) is T&, where T is the 4661 // type of e; 4662 case VK_LValue: T = S.Context.getLValueReferenceType(T); break; 4663 // - otherwise, decltype(e) is the type of e. 4664 case VK_RValue: break; 4665 } 4666 4667 return T; 4668} 4669 4670QualType Sema::BuildDecltypeType(Expr *E, SourceLocation Loc) { 4671 ExprResult ER = CheckPlaceholderExpr(E); 4672 if (ER.isInvalid()) return QualType(); 4673 E = ER.take(); 4674 4675 return Context.getDecltypeType(E, getDecltypeForExpr(*this, E)); 4676} 4677 4678QualType Sema::BuildUnaryTransformType(QualType BaseType, 4679 UnaryTransformType::UTTKind UKind, 4680 SourceLocation Loc) { 4681 switch (UKind) { 4682 case UnaryTransformType::EnumUnderlyingType: 4683 if (!BaseType->isDependentType() && !BaseType->isEnumeralType()) { 4684 Diag(Loc, diag::err_only_enums_have_underlying_types); 4685 return QualType(); 4686 } else { 4687 QualType Underlying = BaseType; 4688 if (!BaseType->isDependentType()) { 4689 EnumDecl *ED = BaseType->getAs<EnumType>()->getDecl(); 4690 assert(ED && "EnumType has no EnumDecl"); 4691 DiagnoseUseOfDecl(ED, Loc); 4692 Underlying = ED->getIntegerType(); 4693 } 4694 assert(!Underlying.isNull()); 4695 return Context.getUnaryTransformType(BaseType, Underlying, 4696 UnaryTransformType::EnumUnderlyingType); 4697 } 4698 } 4699 llvm_unreachable("unknown unary transform type"); 4700} 4701 4702QualType Sema::BuildAtomicType(QualType T, SourceLocation Loc) { 4703 if (!T->isDependentType()) { 4704 // FIXME: It isn't entirely clear whether incomplete atomic types 4705 // are allowed or not; for simplicity, ban them for the moment. 4706 if (RequireCompleteType(Loc, T, diag::err_atomic_specifier_bad_type, 0)) 4707 return QualType(); 4708 4709 int DisallowedKind = -1; 4710 if (T->isArrayType()) 4711 DisallowedKind = 1; 4712 else if (T->isFunctionType()) 4713 DisallowedKind = 2; 4714 else if (T->isReferenceType()) 4715 DisallowedKind = 3; 4716 else if (T->isAtomicType()) 4717 DisallowedKind = 4; 4718 else if (T.hasQualifiers()) 4719 DisallowedKind = 5; 4720 else if (!T.isTriviallyCopyableType(Context)) 4721 // Some other non-trivially-copyable type (probably a C++ class) 4722 DisallowedKind = 6; 4723 4724 if (DisallowedKind != -1) { 4725 Diag(Loc, diag::err_atomic_specifier_bad_type) << DisallowedKind << T; 4726 return QualType(); 4727 } 4728 4729 // FIXME: Do we need any handling for ARC here? 4730 } 4731 4732 // Build the pointer type. 4733 return Context.getAtomicType(T); 4734} 4735