SemaType.cpp revision e925322569cb4aad26cc62036a13e2d3daed862d
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 case AttributeList::AT_PnaclCall \ 110 111namespace { 112 /// An object which stores processing state for the entire 113 /// GetTypeForDeclarator process. 114 class TypeProcessingState { 115 Sema &sema; 116 117 /// The declarator being processed. 118 Declarator &declarator; 119 120 /// The index of the declarator chunk we're currently processing. 121 /// May be the total number of valid chunks, indicating the 122 /// DeclSpec. 123 unsigned chunkIndex; 124 125 /// Whether there are non-trivial modifications to the decl spec. 126 bool trivial; 127 128 /// Whether we saved the attributes in the decl spec. 129 bool hasSavedAttrs; 130 131 /// The original set of attributes on the DeclSpec. 132 SmallVector<AttributeList*, 2> savedAttrs; 133 134 /// A list of attributes to diagnose the uselessness of when the 135 /// processing is complete. 136 SmallVector<AttributeList*, 2> ignoredTypeAttrs; 137 138 public: 139 TypeProcessingState(Sema &sema, Declarator &declarator) 140 : sema(sema), declarator(declarator), 141 chunkIndex(declarator.getNumTypeObjects()), 142 trivial(true), hasSavedAttrs(false) {} 143 144 Sema &getSema() const { 145 return sema; 146 } 147 148 Declarator &getDeclarator() const { 149 return declarator; 150 } 151 152 unsigned getCurrentChunkIndex() const { 153 return chunkIndex; 154 } 155 156 void setCurrentChunkIndex(unsigned idx) { 157 assert(idx <= declarator.getNumTypeObjects()); 158 chunkIndex = idx; 159 } 160 161 AttributeList *&getCurrentAttrListRef() const { 162 assert(chunkIndex <= declarator.getNumTypeObjects()); 163 if (chunkIndex == declarator.getNumTypeObjects()) 164 return getMutableDeclSpec().getAttributes().getListRef(); 165 return declarator.getTypeObject(chunkIndex).getAttrListRef(); 166 } 167 168 /// Save the current set of attributes on the DeclSpec. 169 void saveDeclSpecAttrs() { 170 // Don't try to save them multiple times. 171 if (hasSavedAttrs) return; 172 173 DeclSpec &spec = getMutableDeclSpec(); 174 for (AttributeList *attr = spec.getAttributes().getList(); attr; 175 attr = attr->getNext()) 176 savedAttrs.push_back(attr); 177 trivial &= savedAttrs.empty(); 178 hasSavedAttrs = true; 179 } 180 181 /// Record that we had nowhere to put the given type attribute. 182 /// We will diagnose such attributes later. 183 void addIgnoredTypeAttr(AttributeList &attr) { 184 ignoredTypeAttrs.push_back(&attr); 185 } 186 187 /// Diagnose all the ignored type attributes, given that the 188 /// declarator worked out to the given type. 189 void diagnoseIgnoredTypeAttrs(QualType type) const { 190 for (SmallVectorImpl<AttributeList*>::const_iterator 191 i = ignoredTypeAttrs.begin(), e = ignoredTypeAttrs.end(); 192 i != e; ++i) 193 diagnoseBadTypeAttribute(getSema(), **i, type); 194 } 195 196 ~TypeProcessingState() { 197 if (trivial) return; 198 199 restoreDeclSpecAttrs(); 200 } 201 202 private: 203 DeclSpec &getMutableDeclSpec() const { 204 return const_cast<DeclSpec&>(declarator.getDeclSpec()); 205 } 206 207 void restoreDeclSpecAttrs() { 208 assert(hasSavedAttrs); 209 210 if (savedAttrs.empty()) { 211 getMutableDeclSpec().getAttributes().set(0); 212 return; 213 } 214 215 getMutableDeclSpec().getAttributes().set(savedAttrs[0]); 216 for (unsigned i = 0, e = savedAttrs.size() - 1; i != e; ++i) 217 savedAttrs[i]->setNext(savedAttrs[i+1]); 218 savedAttrs.back()->setNext(0); 219 } 220 }; 221 222 /// Basically std::pair except that we really want to avoid an 223 /// implicit operator= for safety concerns. It's also a minor 224 /// link-time optimization for this to be a private type. 225 struct AttrAndList { 226 /// The attribute. 227 AttributeList &first; 228 229 /// The head of the list the attribute is currently in. 230 AttributeList *&second; 231 232 AttrAndList(AttributeList &attr, AttributeList *&head) 233 : first(attr), second(head) {} 234 }; 235} 236 237namespace llvm { 238 template <> struct isPodLike<AttrAndList> { 239 static const bool value = true; 240 }; 241} 242 243static void spliceAttrIntoList(AttributeList &attr, AttributeList *&head) { 244 attr.setNext(head); 245 head = &attr; 246} 247 248static void spliceAttrOutOfList(AttributeList &attr, AttributeList *&head) { 249 if (head == &attr) { 250 head = attr.getNext(); 251 return; 252 } 253 254 AttributeList *cur = head; 255 while (true) { 256 assert(cur && cur->getNext() && "ran out of attrs?"); 257 if (cur->getNext() == &attr) { 258 cur->setNext(attr.getNext()); 259 return; 260 } 261 cur = cur->getNext(); 262 } 263} 264 265static void moveAttrFromListToList(AttributeList &attr, 266 AttributeList *&fromList, 267 AttributeList *&toList) { 268 spliceAttrOutOfList(attr, fromList); 269 spliceAttrIntoList(attr, toList); 270} 271 272static void processTypeAttrs(TypeProcessingState &state, 273 QualType &type, bool isDeclSpec, 274 AttributeList *attrs); 275 276static bool handleFunctionTypeAttr(TypeProcessingState &state, 277 AttributeList &attr, 278 QualType &type); 279 280static bool handleObjCGCTypeAttr(TypeProcessingState &state, 281 AttributeList &attr, QualType &type); 282 283static bool handleObjCOwnershipTypeAttr(TypeProcessingState &state, 284 AttributeList &attr, QualType &type); 285 286static bool handleObjCPointerTypeAttr(TypeProcessingState &state, 287 AttributeList &attr, QualType &type) { 288 if (attr.getKind() == AttributeList::AT_ObjCGC) 289 return handleObjCGCTypeAttr(state, attr, type); 290 assert(attr.getKind() == AttributeList::AT_ObjCOwnership); 291 return handleObjCOwnershipTypeAttr(state, attr, type); 292} 293 294/// Given that an objc_gc attribute was written somewhere on a 295/// declaration *other* than on the declarator itself (for which, use 296/// distributeObjCPointerTypeAttrFromDeclarator), and given that it 297/// didn't apply in whatever position it was written in, try to move 298/// it to a more appropriate position. 299static void distributeObjCPointerTypeAttr(TypeProcessingState &state, 300 AttributeList &attr, 301 QualType type) { 302 Declarator &declarator = state.getDeclarator(); 303 for (unsigned i = state.getCurrentChunkIndex(); i != 0; --i) { 304 DeclaratorChunk &chunk = declarator.getTypeObject(i-1); 305 switch (chunk.Kind) { 306 case DeclaratorChunk::Pointer: 307 case DeclaratorChunk::BlockPointer: 308 moveAttrFromListToList(attr, state.getCurrentAttrListRef(), 309 chunk.getAttrListRef()); 310 return; 311 312 case DeclaratorChunk::Paren: 313 case DeclaratorChunk::Array: 314 continue; 315 316 // Don't walk through these. 317 case DeclaratorChunk::Reference: 318 case DeclaratorChunk::Function: 319 case DeclaratorChunk::MemberPointer: 320 goto error; 321 } 322 } 323 error: 324 325 diagnoseBadTypeAttribute(state.getSema(), attr, type); 326} 327 328/// Distribute an objc_gc type attribute that was written on the 329/// declarator. 330static void 331distributeObjCPointerTypeAttrFromDeclarator(TypeProcessingState &state, 332 AttributeList &attr, 333 QualType &declSpecType) { 334 Declarator &declarator = state.getDeclarator(); 335 336 // objc_gc goes on the innermost pointer to something that's not a 337 // pointer. 338 unsigned innermost = -1U; 339 bool considerDeclSpec = true; 340 for (unsigned i = 0, e = declarator.getNumTypeObjects(); i != e; ++i) { 341 DeclaratorChunk &chunk = declarator.getTypeObject(i); 342 switch (chunk.Kind) { 343 case DeclaratorChunk::Pointer: 344 case DeclaratorChunk::BlockPointer: 345 innermost = i; 346 continue; 347 348 case DeclaratorChunk::Reference: 349 case DeclaratorChunk::MemberPointer: 350 case DeclaratorChunk::Paren: 351 case DeclaratorChunk::Array: 352 continue; 353 354 case DeclaratorChunk::Function: 355 considerDeclSpec = false; 356 goto done; 357 } 358 } 359 done: 360 361 // That might actually be the decl spec if we weren't blocked by 362 // anything in the declarator. 363 if (considerDeclSpec) { 364 if (handleObjCPointerTypeAttr(state, attr, declSpecType)) { 365 // Splice the attribute into the decl spec. Prevents the 366 // attribute from being applied multiple times and gives 367 // the source-location-filler something to work with. 368 state.saveDeclSpecAttrs(); 369 moveAttrFromListToList(attr, declarator.getAttrListRef(), 370 declarator.getMutableDeclSpec().getAttributes().getListRef()); 371 return; 372 } 373 } 374 375 // Otherwise, if we found an appropriate chunk, splice the attribute 376 // into it. 377 if (innermost != -1U) { 378 moveAttrFromListToList(attr, declarator.getAttrListRef(), 379 declarator.getTypeObject(innermost).getAttrListRef()); 380 return; 381 } 382 383 // Otherwise, diagnose when we're done building the type. 384 spliceAttrOutOfList(attr, declarator.getAttrListRef()); 385 state.addIgnoredTypeAttr(attr); 386} 387 388/// A function type attribute was written somewhere in a declaration 389/// *other* than on the declarator itself or in the decl spec. Given 390/// that it didn't apply in whatever position it was written in, try 391/// to move it to a more appropriate position. 392static void distributeFunctionTypeAttr(TypeProcessingState &state, 393 AttributeList &attr, 394 QualType type) { 395 Declarator &declarator = state.getDeclarator(); 396 397 // Try to push the attribute from the return type of a function to 398 // the function itself. 399 for (unsigned i = state.getCurrentChunkIndex(); i != 0; --i) { 400 DeclaratorChunk &chunk = declarator.getTypeObject(i-1); 401 switch (chunk.Kind) { 402 case DeclaratorChunk::Function: 403 moveAttrFromListToList(attr, state.getCurrentAttrListRef(), 404 chunk.getAttrListRef()); 405 return; 406 407 case DeclaratorChunk::Paren: 408 case DeclaratorChunk::Pointer: 409 case DeclaratorChunk::BlockPointer: 410 case DeclaratorChunk::Array: 411 case DeclaratorChunk::Reference: 412 case DeclaratorChunk::MemberPointer: 413 continue; 414 } 415 } 416 417 diagnoseBadTypeAttribute(state.getSema(), attr, type); 418} 419 420/// Try to distribute a function type attribute to the innermost 421/// function chunk or type. Returns true if the attribute was 422/// distributed, false if no location was found. 423static bool 424distributeFunctionTypeAttrToInnermost(TypeProcessingState &state, 425 AttributeList &attr, 426 AttributeList *&attrList, 427 QualType &declSpecType) { 428 Declarator &declarator = state.getDeclarator(); 429 430 // Put it on the innermost function chunk, if there is one. 431 for (unsigned i = 0, e = declarator.getNumTypeObjects(); i != e; ++i) { 432 DeclaratorChunk &chunk = declarator.getTypeObject(i); 433 if (chunk.Kind != DeclaratorChunk::Function) continue; 434 435 moveAttrFromListToList(attr, attrList, chunk.getAttrListRef()); 436 return true; 437 } 438 439 if (handleFunctionTypeAttr(state, attr, declSpecType)) { 440 spliceAttrOutOfList(attr, attrList); 441 return true; 442 } 443 444 return false; 445} 446 447/// A function type attribute was written in the decl spec. Try to 448/// apply it somewhere. 449static void 450distributeFunctionTypeAttrFromDeclSpec(TypeProcessingState &state, 451 AttributeList &attr, 452 QualType &declSpecType) { 453 state.saveDeclSpecAttrs(); 454 455 // Try to distribute to the innermost. 456 if (distributeFunctionTypeAttrToInnermost(state, attr, 457 state.getCurrentAttrListRef(), 458 declSpecType)) 459 return; 460 461 // If that failed, diagnose the bad attribute when the declarator is 462 // fully built. 463 state.addIgnoredTypeAttr(attr); 464} 465 466/// A function type attribute was written on the declarator. Try to 467/// apply it somewhere. 468static void 469distributeFunctionTypeAttrFromDeclarator(TypeProcessingState &state, 470 AttributeList &attr, 471 QualType &declSpecType) { 472 Declarator &declarator = state.getDeclarator(); 473 474 // Try to distribute to the innermost. 475 if (distributeFunctionTypeAttrToInnermost(state, attr, 476 declarator.getAttrListRef(), 477 declSpecType)) 478 return; 479 480 // If that failed, diagnose the bad attribute when the declarator is 481 // fully built. 482 spliceAttrOutOfList(attr, declarator.getAttrListRef()); 483 state.addIgnoredTypeAttr(attr); 484} 485 486/// \brief Given that there are attributes written on the declarator 487/// itself, try to distribute any type attributes to the appropriate 488/// declarator chunk. 489/// 490/// These are attributes like the following: 491/// int f ATTR; 492/// int (f ATTR)(); 493/// but not necessarily this: 494/// int f() ATTR; 495static void distributeTypeAttrsFromDeclarator(TypeProcessingState &state, 496 QualType &declSpecType) { 497 // Collect all the type attributes from the declarator itself. 498 assert(state.getDeclarator().getAttributes() && "declarator has no attrs!"); 499 AttributeList *attr = state.getDeclarator().getAttributes(); 500 AttributeList *next; 501 do { 502 next = attr->getNext(); 503 504 switch (attr->getKind()) { 505 OBJC_POINTER_TYPE_ATTRS_CASELIST: 506 distributeObjCPointerTypeAttrFromDeclarator(state, *attr, declSpecType); 507 break; 508 509 case AttributeList::AT_NSReturnsRetained: 510 if (!state.getSema().getLangOpts().ObjCAutoRefCount) 511 break; 512 // fallthrough 513 514 FUNCTION_TYPE_ATTRS_CASELIST: 515 distributeFunctionTypeAttrFromDeclarator(state, *attr, declSpecType); 516 break; 517 518 default: 519 break; 520 } 521 } while ((attr = next)); 522} 523 524/// Add a synthetic '()' to a block-literal declarator if it is 525/// required, given the return type. 526static void maybeSynthesizeBlockSignature(TypeProcessingState &state, 527 QualType declSpecType) { 528 Declarator &declarator = state.getDeclarator(); 529 530 // First, check whether the declarator would produce a function, 531 // i.e. whether the innermost semantic chunk is a function. 532 if (declarator.isFunctionDeclarator()) { 533 // If so, make that declarator a prototyped declarator. 534 declarator.getFunctionTypeInfo().hasPrototype = true; 535 return; 536 } 537 538 // If there are any type objects, the type as written won't name a 539 // function, regardless of the decl spec type. This is because a 540 // block signature declarator is always an abstract-declarator, and 541 // abstract-declarators can't just be parentheses chunks. Therefore 542 // we need to build a function chunk unless there are no type 543 // objects and the decl spec type is a function. 544 if (!declarator.getNumTypeObjects() && declSpecType->isFunctionType()) 545 return; 546 547 // Note that there *are* cases with invalid declarators where 548 // declarators consist solely of parentheses. In general, these 549 // occur only in failed efforts to make function declarators, so 550 // faking up the function chunk is still the right thing to do. 551 552 // Otherwise, we need to fake up a function declarator. 553 SourceLocation loc = declarator.getLocStart(); 554 555 // ...and *prepend* it to the declarator. 556 SourceLocation NoLoc; 557 declarator.AddInnermostTypeInfo(DeclaratorChunk::getFunction( 558 /*HasProto=*/true, 559 /*IsAmbiguous=*/false, 560 /*LParenLoc=*/NoLoc, 561 /*ArgInfo=*/0, 562 /*NumArgs=*/0, 563 /*EllipsisLoc=*/NoLoc, 564 /*RParenLoc=*/NoLoc, 565 /*TypeQuals=*/0, 566 /*RefQualifierIsLvalueRef=*/true, 567 /*RefQualifierLoc=*/NoLoc, 568 /*ConstQualifierLoc=*/NoLoc, 569 /*VolatileQualifierLoc=*/NoLoc, 570 /*MutableLoc=*/NoLoc, 571 EST_None, 572 /*ESpecLoc=*/NoLoc, 573 /*Exceptions=*/0, 574 /*ExceptionRanges=*/0, 575 /*NumExceptions=*/0, 576 /*NoexceptExpr=*/0, 577 loc, loc, declarator)); 578 579 // For consistency, make sure the state still has us as processing 580 // the decl spec. 581 assert(state.getCurrentChunkIndex() == declarator.getNumTypeObjects() - 1); 582 state.setCurrentChunkIndex(declarator.getNumTypeObjects()); 583} 584 585/// \brief Convert the specified declspec to the appropriate type 586/// object. 587/// \param state Specifies the declarator containing the declaration specifier 588/// to be converted, along with other associated processing state. 589/// \returns The type described by the declaration specifiers. This function 590/// never returns null. 591static QualType ConvertDeclSpecToType(TypeProcessingState &state) { 592 // FIXME: Should move the logic from DeclSpec::Finish to here for validity 593 // checking. 594 595 Sema &S = state.getSema(); 596 Declarator &declarator = state.getDeclarator(); 597 const DeclSpec &DS = declarator.getDeclSpec(); 598 SourceLocation DeclLoc = declarator.getIdentifierLoc(); 599 if (DeclLoc.isInvalid()) 600 DeclLoc = DS.getLocStart(); 601 602 ASTContext &Context = S.Context; 603 604 QualType Result; 605 switch (DS.getTypeSpecType()) { 606 case DeclSpec::TST_void: 607 Result = Context.VoidTy; 608 break; 609 case DeclSpec::TST_char: 610 if (DS.getTypeSpecSign() == DeclSpec::TSS_unspecified) 611 Result = Context.CharTy; 612 else if (DS.getTypeSpecSign() == DeclSpec::TSS_signed) 613 Result = Context.SignedCharTy; 614 else { 615 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unsigned && 616 "Unknown TSS value"); 617 Result = Context.UnsignedCharTy; 618 } 619 break; 620 case DeclSpec::TST_wchar: 621 if (DS.getTypeSpecSign() == DeclSpec::TSS_unspecified) 622 Result = Context.WCharTy; 623 else if (DS.getTypeSpecSign() == DeclSpec::TSS_signed) { 624 S.Diag(DS.getTypeSpecSignLoc(), diag::ext_invalid_sign_spec) 625 << DS.getSpecifierName(DS.getTypeSpecType()); 626 Result = Context.getSignedWCharType(); 627 } else { 628 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unsigned && 629 "Unknown TSS value"); 630 S.Diag(DS.getTypeSpecSignLoc(), diag::ext_invalid_sign_spec) 631 << DS.getSpecifierName(DS.getTypeSpecType()); 632 Result = Context.getUnsignedWCharType(); 633 } 634 break; 635 case DeclSpec::TST_char16: 636 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unspecified && 637 "Unknown TSS value"); 638 Result = Context.Char16Ty; 639 break; 640 case DeclSpec::TST_char32: 641 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unspecified && 642 "Unknown TSS value"); 643 Result = Context.Char32Ty; 644 break; 645 case DeclSpec::TST_unspecified: 646 // "<proto1,proto2>" is an objc qualified ID with a missing id. 647 if (DeclSpec::ProtocolQualifierListTy PQ = DS.getProtocolQualifiers()) { 648 Result = Context.getObjCObjectType(Context.ObjCBuiltinIdTy, 649 (ObjCProtocolDecl*const*)PQ, 650 DS.getNumProtocolQualifiers()); 651 Result = Context.getObjCObjectPointerType(Result); 652 break; 653 } 654 655 // If this is a missing declspec in a block literal return context, then it 656 // is inferred from the return statements inside the block. 657 // The declspec is always missing in a lambda expr context; it is either 658 // specified with a trailing return type or inferred. 659 if (declarator.getContext() == Declarator::LambdaExprContext || 660 isOmittedBlockReturnType(declarator)) { 661 Result = Context.DependentTy; 662 break; 663 } 664 665 // Unspecified typespec defaults to int in C90. However, the C90 grammar 666 // [C90 6.5] only allows a decl-spec if there was *some* type-specifier, 667 // type-qualifier, or storage-class-specifier. If not, emit an extwarn. 668 // Note that the one exception to this is function definitions, which are 669 // allowed to be completely missing a declspec. This is handled in the 670 // parser already though by it pretending to have seen an 'int' in this 671 // case. 672 if (S.getLangOpts().ImplicitInt) { 673 // In C89 mode, we only warn if there is a completely missing declspec 674 // when one is not allowed. 675 if (DS.isEmpty()) { 676 S.Diag(DeclLoc, diag::ext_missing_declspec) 677 << DS.getSourceRange() 678 << FixItHint::CreateInsertion(DS.getLocStart(), "int"); 679 } 680 } else if (!DS.hasTypeSpecifier()) { 681 // C99 and C++ require a type specifier. For example, C99 6.7.2p2 says: 682 // "At least one type specifier shall be given in the declaration 683 // specifiers in each declaration, and in the specifier-qualifier list in 684 // each struct declaration and type name." 685 // FIXME: Does Microsoft really have the implicit int extension in C++? 686 if (S.getLangOpts().CPlusPlus && 687 !S.getLangOpts().MicrosoftExt) { 688 S.Diag(DeclLoc, diag::err_missing_type_specifier) 689 << DS.getSourceRange(); 690 691 // When this occurs in C++ code, often something is very broken with the 692 // value being declared, poison it as invalid so we don't get chains of 693 // errors. 694 declarator.setInvalidType(true); 695 } else { 696 S.Diag(DeclLoc, diag::ext_missing_type_specifier) 697 << DS.getSourceRange(); 698 } 699 } 700 701 // FALL THROUGH. 702 case DeclSpec::TST_int: { 703 if (DS.getTypeSpecSign() != DeclSpec::TSS_unsigned) { 704 switch (DS.getTypeSpecWidth()) { 705 case DeclSpec::TSW_unspecified: Result = Context.IntTy; break; 706 case DeclSpec::TSW_short: Result = Context.ShortTy; break; 707 case DeclSpec::TSW_long: Result = Context.LongTy; break; 708 case DeclSpec::TSW_longlong: 709 Result = Context.LongLongTy; 710 711 // 'long long' is a C99 or C++11 feature. 712 if (!S.getLangOpts().C99) { 713 if (S.getLangOpts().CPlusPlus) 714 S.Diag(DS.getTypeSpecWidthLoc(), 715 S.getLangOpts().CPlusPlus0x ? 716 diag::warn_cxx98_compat_longlong : diag::ext_cxx11_longlong); 717 else 718 S.Diag(DS.getTypeSpecWidthLoc(), diag::ext_c99_longlong); 719 } 720 break; 721 } 722 } else { 723 switch (DS.getTypeSpecWidth()) { 724 case DeclSpec::TSW_unspecified: Result = Context.UnsignedIntTy; break; 725 case DeclSpec::TSW_short: Result = Context.UnsignedShortTy; break; 726 case DeclSpec::TSW_long: Result = Context.UnsignedLongTy; break; 727 case DeclSpec::TSW_longlong: 728 Result = Context.UnsignedLongLongTy; 729 730 // 'long long' is a C99 or C++11 feature. 731 if (!S.getLangOpts().C99) { 732 if (S.getLangOpts().CPlusPlus) 733 S.Diag(DS.getTypeSpecWidthLoc(), 734 S.getLangOpts().CPlusPlus0x ? 735 diag::warn_cxx98_compat_longlong : diag::ext_cxx11_longlong); 736 else 737 S.Diag(DS.getTypeSpecWidthLoc(), diag::ext_c99_longlong); 738 } 739 break; 740 } 741 } 742 break; 743 } 744 case DeclSpec::TST_int128: 745 if (DS.getTypeSpecSign() == DeclSpec::TSS_unsigned) 746 Result = Context.UnsignedInt128Ty; 747 else 748 Result = Context.Int128Ty; 749 break; 750 case DeclSpec::TST_half: Result = Context.HalfTy; break; 751 case DeclSpec::TST_float: Result = Context.FloatTy; break; 752 case DeclSpec::TST_double: 753 if (DS.getTypeSpecWidth() == DeclSpec::TSW_long) 754 Result = Context.LongDoubleTy; 755 else 756 Result = Context.DoubleTy; 757 758 if (S.getLangOpts().OpenCL && !S.getOpenCLOptions().cl_khr_fp64) { 759 S.Diag(DS.getTypeSpecTypeLoc(), diag::err_double_requires_fp64); 760 declarator.setInvalidType(true); 761 } 762 break; 763 case DeclSpec::TST_bool: Result = Context.BoolTy; break; // _Bool or bool 764 case DeclSpec::TST_decimal32: // _Decimal32 765 case DeclSpec::TST_decimal64: // _Decimal64 766 case DeclSpec::TST_decimal128: // _Decimal128 767 S.Diag(DS.getTypeSpecTypeLoc(), diag::err_decimal_unsupported); 768 Result = Context.IntTy; 769 declarator.setInvalidType(true); 770 break; 771 case DeclSpec::TST_class: 772 case DeclSpec::TST_enum: 773 case DeclSpec::TST_union: 774 case DeclSpec::TST_struct: 775 case DeclSpec::TST_interface: { 776 TypeDecl *D = dyn_cast_or_null<TypeDecl>(DS.getRepAsDecl()); 777 if (!D) { 778 // This can happen in C++ with ambiguous lookups. 779 Result = Context.IntTy; 780 declarator.setInvalidType(true); 781 break; 782 } 783 784 // If the type is deprecated or unavailable, diagnose it. 785 S.DiagnoseUseOfDecl(D, DS.getTypeSpecTypeNameLoc()); 786 787 assert(DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 && 788 DS.getTypeSpecSign() == 0 && "No qualifiers on tag names!"); 789 790 // TypeQuals handled by caller. 791 Result = Context.getTypeDeclType(D); 792 793 // In both C and C++, make an ElaboratedType. 794 ElaboratedTypeKeyword Keyword 795 = ElaboratedType::getKeywordForTypeSpec(DS.getTypeSpecType()); 796 Result = S.getElaboratedType(Keyword, DS.getTypeSpecScope(), Result); 797 break; 798 } 799 case DeclSpec::TST_typename: { 800 assert(DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 && 801 DS.getTypeSpecSign() == 0 && 802 "Can't handle qualifiers on typedef names yet!"); 803 Result = S.GetTypeFromParser(DS.getRepAsType()); 804 if (Result.isNull()) 805 declarator.setInvalidType(true); 806 else if (DeclSpec::ProtocolQualifierListTy PQ 807 = DS.getProtocolQualifiers()) { 808 if (const ObjCObjectType *ObjT = Result->getAs<ObjCObjectType>()) { 809 // Silently drop any existing protocol qualifiers. 810 // TODO: determine whether that's the right thing to do. 811 if (ObjT->getNumProtocols()) 812 Result = ObjT->getBaseType(); 813 814 if (DS.getNumProtocolQualifiers()) 815 Result = Context.getObjCObjectType(Result, 816 (ObjCProtocolDecl*const*) PQ, 817 DS.getNumProtocolQualifiers()); 818 } else if (Result->isObjCIdType()) { 819 // id<protocol-list> 820 Result = Context.getObjCObjectType(Context.ObjCBuiltinIdTy, 821 (ObjCProtocolDecl*const*) PQ, 822 DS.getNumProtocolQualifiers()); 823 Result = Context.getObjCObjectPointerType(Result); 824 } else if (Result->isObjCClassType()) { 825 // Class<protocol-list> 826 Result = Context.getObjCObjectType(Context.ObjCBuiltinClassTy, 827 (ObjCProtocolDecl*const*) PQ, 828 DS.getNumProtocolQualifiers()); 829 Result = Context.getObjCObjectPointerType(Result); 830 } else { 831 S.Diag(DeclLoc, diag::err_invalid_protocol_qualifiers) 832 << DS.getSourceRange(); 833 declarator.setInvalidType(true); 834 } 835 } 836 837 // TypeQuals handled by caller. 838 break; 839 } 840 case DeclSpec::TST_typeofType: 841 // FIXME: Preserve type source info. 842 Result = S.GetTypeFromParser(DS.getRepAsType()); 843 assert(!Result.isNull() && "Didn't get a type for typeof?"); 844 if (!Result->isDependentType()) 845 if (const TagType *TT = Result->getAs<TagType>()) 846 S.DiagnoseUseOfDecl(TT->getDecl(), DS.getTypeSpecTypeLoc()); 847 // TypeQuals handled by caller. 848 Result = Context.getTypeOfType(Result); 849 break; 850 case DeclSpec::TST_typeofExpr: { 851 Expr *E = DS.getRepAsExpr(); 852 assert(E && "Didn't get an expression for typeof?"); 853 // TypeQuals handled by caller. 854 Result = S.BuildTypeofExprType(E, DS.getTypeSpecTypeLoc()); 855 if (Result.isNull()) { 856 Result = Context.IntTy; 857 declarator.setInvalidType(true); 858 } 859 break; 860 } 861 case DeclSpec::TST_decltype: { 862 Expr *E = DS.getRepAsExpr(); 863 assert(E && "Didn't get an expression for decltype?"); 864 // TypeQuals handled by caller. 865 Result = S.BuildDecltypeType(E, DS.getTypeSpecTypeLoc()); 866 if (Result.isNull()) { 867 Result = Context.IntTy; 868 declarator.setInvalidType(true); 869 } 870 break; 871 } 872 case DeclSpec::TST_underlyingType: 873 Result = S.GetTypeFromParser(DS.getRepAsType()); 874 assert(!Result.isNull() && "Didn't get a type for __underlying_type?"); 875 Result = S.BuildUnaryTransformType(Result, 876 UnaryTransformType::EnumUnderlyingType, 877 DS.getTypeSpecTypeLoc()); 878 if (Result.isNull()) { 879 Result = Context.IntTy; 880 declarator.setInvalidType(true); 881 } 882 break; 883 884 case DeclSpec::TST_auto: { 885 // TypeQuals handled by caller. 886 Result = Context.getAutoType(QualType()); 887 break; 888 } 889 890 case DeclSpec::TST_unknown_anytype: 891 Result = Context.UnknownAnyTy; 892 break; 893 894 case DeclSpec::TST_atomic: 895 Result = S.GetTypeFromParser(DS.getRepAsType()); 896 assert(!Result.isNull() && "Didn't get a type for _Atomic?"); 897 Result = S.BuildAtomicType(Result, DS.getTypeSpecTypeLoc()); 898 if (Result.isNull()) { 899 Result = Context.IntTy; 900 declarator.setInvalidType(true); 901 } 902 break; 903 904 case DeclSpec::TST_error: 905 Result = Context.IntTy; 906 declarator.setInvalidType(true); 907 break; 908 } 909 910 // Handle complex types. 911 if (DS.getTypeSpecComplex() == DeclSpec::TSC_complex) { 912 if (S.getLangOpts().Freestanding) 913 S.Diag(DS.getTypeSpecComplexLoc(), diag::ext_freestanding_complex); 914 Result = Context.getComplexType(Result); 915 } else if (DS.isTypeAltiVecVector()) { 916 unsigned typeSize = static_cast<unsigned>(Context.getTypeSize(Result)); 917 assert(typeSize > 0 && "type size for vector must be greater than 0 bits"); 918 VectorType::VectorKind VecKind = VectorType::AltiVecVector; 919 if (DS.isTypeAltiVecPixel()) 920 VecKind = VectorType::AltiVecPixel; 921 else if (DS.isTypeAltiVecBool()) 922 VecKind = VectorType::AltiVecBool; 923 Result = Context.getVectorType(Result, 128/typeSize, VecKind); 924 } 925 926 // FIXME: Imaginary. 927 if (DS.getTypeSpecComplex() == DeclSpec::TSC_imaginary) 928 S.Diag(DS.getTypeSpecComplexLoc(), diag::err_imaginary_not_supported); 929 930 // Before we process any type attributes, synthesize a block literal 931 // function declarator if necessary. 932 if (declarator.getContext() == Declarator::BlockLiteralContext) 933 maybeSynthesizeBlockSignature(state, Result); 934 935 // Apply any type attributes from the decl spec. This may cause the 936 // list of type attributes to be temporarily saved while the type 937 // attributes are pushed around. 938 if (AttributeList *attrs = DS.getAttributes().getList()) 939 processTypeAttrs(state, Result, true, attrs); 940 941 // Apply const/volatile/restrict qualifiers to T. 942 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 943 944 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 945 // or incomplete types shall not be restrict-qualified." C++ also allows 946 // restrict-qualified references. 947 if (TypeQuals & DeclSpec::TQ_restrict) { 948 if (Result->isAnyPointerType() || Result->isReferenceType()) { 949 QualType EltTy; 950 if (Result->isObjCObjectPointerType()) 951 EltTy = Result; 952 else 953 EltTy = Result->isPointerType() ? 954 Result->getAs<PointerType>()->getPointeeType() : 955 Result->getAs<ReferenceType>()->getPointeeType(); 956 957 // If we have a pointer or reference, the pointee must have an object 958 // incomplete type. 959 if (!EltTy->isIncompleteOrObjectType()) { 960 S.Diag(DS.getRestrictSpecLoc(), 961 diag::err_typecheck_invalid_restrict_invalid_pointee) 962 << EltTy << DS.getSourceRange(); 963 TypeQuals &= ~DeclSpec::TQ_restrict; // Remove the restrict qualifier. 964 } 965 } else { 966 S.Diag(DS.getRestrictSpecLoc(), 967 diag::err_typecheck_invalid_restrict_not_pointer) 968 << Result << DS.getSourceRange(); 969 TypeQuals &= ~DeclSpec::TQ_restrict; // Remove the restrict qualifier. 970 } 971 } 972 973 // Warn about CV qualifiers on functions: C99 6.7.3p8: "If the specification 974 // of a function type includes any type qualifiers, the behavior is 975 // undefined." 976 if (Result->isFunctionType() && TypeQuals) { 977 // Get some location to point at, either the C or V location. 978 SourceLocation Loc; 979 if (TypeQuals & DeclSpec::TQ_const) 980 Loc = DS.getConstSpecLoc(); 981 else if (TypeQuals & DeclSpec::TQ_volatile) 982 Loc = DS.getVolatileSpecLoc(); 983 else { 984 assert((TypeQuals & DeclSpec::TQ_restrict) && 985 "Has CVR quals but not C, V, or R?"); 986 Loc = DS.getRestrictSpecLoc(); 987 } 988 S.Diag(Loc, diag::warn_typecheck_function_qualifiers) 989 << Result << DS.getSourceRange(); 990 } 991 992 // C++ [dcl.ref]p1: 993 // Cv-qualified references are ill-formed except when the 994 // cv-qualifiers are introduced through the use of a typedef 995 // (7.1.3) or of a template type argument (14.3), in which 996 // case the cv-qualifiers are ignored. 997 // FIXME: Shouldn't we be checking SCS_typedef here? 998 if (DS.getTypeSpecType() == DeclSpec::TST_typename && 999 TypeQuals && Result->isReferenceType()) { 1000 TypeQuals &= ~DeclSpec::TQ_const; 1001 TypeQuals &= ~DeclSpec::TQ_volatile; 1002 } 1003 1004 // C90 6.5.3 constraints: "The same type qualifier shall not appear more 1005 // than once in the same specifier-list or qualifier-list, either directly 1006 // or via one or more typedefs." 1007 if (!S.getLangOpts().C99 && !S.getLangOpts().CPlusPlus 1008 && TypeQuals & Result.getCVRQualifiers()) { 1009 if (TypeQuals & DeclSpec::TQ_const && Result.isConstQualified()) { 1010 S.Diag(DS.getConstSpecLoc(), diag::ext_duplicate_declspec) 1011 << "const"; 1012 } 1013 1014 if (TypeQuals & DeclSpec::TQ_volatile && Result.isVolatileQualified()) { 1015 S.Diag(DS.getVolatileSpecLoc(), diag::ext_duplicate_declspec) 1016 << "volatile"; 1017 } 1018 1019 // C90 doesn't have restrict, so it doesn't force us to produce a warning 1020 // in this case. 1021 } 1022 1023 Qualifiers Quals = Qualifiers::fromCVRMask(TypeQuals); 1024 Result = Context.getQualifiedType(Result, Quals); 1025 } 1026 1027 return Result; 1028} 1029 1030static std::string getPrintableNameForEntity(DeclarationName Entity) { 1031 if (Entity) 1032 return Entity.getAsString(); 1033 1034 return "type name"; 1035} 1036 1037QualType Sema::BuildQualifiedType(QualType T, SourceLocation Loc, 1038 Qualifiers Qs) { 1039 // Enforce C99 6.7.3p2: "Types other than pointer types derived from 1040 // object or incomplete types shall not be restrict-qualified." 1041 if (Qs.hasRestrict()) { 1042 unsigned DiagID = 0; 1043 QualType ProblemTy; 1044 1045 const Type *Ty = T->getCanonicalTypeInternal().getTypePtr(); 1046 if (const ReferenceType *RTy = dyn_cast<ReferenceType>(Ty)) { 1047 if (!RTy->getPointeeType()->isIncompleteOrObjectType()) { 1048 DiagID = diag::err_typecheck_invalid_restrict_invalid_pointee; 1049 ProblemTy = T->getAs<ReferenceType>()->getPointeeType(); 1050 } 1051 } else if (const PointerType *PTy = dyn_cast<PointerType>(Ty)) { 1052 if (!PTy->getPointeeType()->isIncompleteOrObjectType()) { 1053 DiagID = diag::err_typecheck_invalid_restrict_invalid_pointee; 1054 ProblemTy = T->getAs<PointerType>()->getPointeeType(); 1055 } 1056 } else if (const MemberPointerType *PTy = dyn_cast<MemberPointerType>(Ty)) { 1057 if (!PTy->getPointeeType()->isIncompleteOrObjectType()) { 1058 DiagID = diag::err_typecheck_invalid_restrict_invalid_pointee; 1059 ProblemTy = T->getAs<PointerType>()->getPointeeType(); 1060 } 1061 } else if (!Ty->isDependentType()) { 1062 // FIXME: this deserves a proper diagnostic 1063 DiagID = diag::err_typecheck_invalid_restrict_invalid_pointee; 1064 ProblemTy = T; 1065 } 1066 1067 if (DiagID) { 1068 Diag(Loc, DiagID) << ProblemTy; 1069 Qs.removeRestrict(); 1070 } 1071 } 1072 1073 return Context.getQualifiedType(T, Qs); 1074} 1075 1076/// \brief Build a paren type including \p T. 1077QualType Sema::BuildParenType(QualType T) { 1078 return Context.getParenType(T); 1079} 1080 1081/// Given that we're building a pointer or reference to the given 1082static QualType inferARCLifetimeForPointee(Sema &S, QualType type, 1083 SourceLocation loc, 1084 bool isReference) { 1085 // Bail out if retention is unrequired or already specified. 1086 if (!type->isObjCLifetimeType() || 1087 type.getObjCLifetime() != Qualifiers::OCL_None) 1088 return type; 1089 1090 Qualifiers::ObjCLifetime implicitLifetime = Qualifiers::OCL_None; 1091 1092 // If the object type is const-qualified, we can safely use 1093 // __unsafe_unretained. This is safe (because there are no read 1094 // barriers), and it'll be safe to coerce anything but __weak* to 1095 // the resulting type. 1096 if (type.isConstQualified()) { 1097 implicitLifetime = Qualifiers::OCL_ExplicitNone; 1098 1099 // Otherwise, check whether the static type does not require 1100 // retaining. This currently only triggers for Class (possibly 1101 // protocol-qualifed, and arrays thereof). 1102 } else if (type->isObjCARCImplicitlyUnretainedType()) { 1103 implicitLifetime = Qualifiers::OCL_ExplicitNone; 1104 1105 // If we are in an unevaluated context, like sizeof, skip adding a 1106 // qualification. 1107 } else if (S.isUnevaluatedContext()) { 1108 return type; 1109 1110 // If that failed, give an error and recover using __strong. __strong 1111 // is the option most likely to prevent spurious second-order diagnostics, 1112 // like when binding a reference to a field. 1113 } else { 1114 // These types can show up in private ivars in system headers, so 1115 // we need this to not be an error in those cases. Instead we 1116 // want to delay. 1117 if (S.DelayedDiagnostics.shouldDelayDiagnostics()) { 1118 S.DelayedDiagnostics.add( 1119 sema::DelayedDiagnostic::makeForbiddenType(loc, 1120 diag::err_arc_indirect_no_ownership, type, isReference)); 1121 } else { 1122 S.Diag(loc, diag::err_arc_indirect_no_ownership) << type << isReference; 1123 } 1124 implicitLifetime = Qualifiers::OCL_Strong; 1125 } 1126 assert(implicitLifetime && "didn't infer any lifetime!"); 1127 1128 Qualifiers qs; 1129 qs.addObjCLifetime(implicitLifetime); 1130 return S.Context.getQualifiedType(type, qs); 1131} 1132 1133/// \brief Build a pointer type. 1134/// 1135/// \param T The type to which we'll be building a pointer. 1136/// 1137/// \param Loc The location of the entity whose type involves this 1138/// pointer type or, if there is no such entity, the location of the 1139/// type that will have pointer type. 1140/// 1141/// \param Entity The name of the entity that involves the pointer 1142/// type, if known. 1143/// 1144/// \returns A suitable pointer type, if there are no 1145/// errors. Otherwise, returns a NULL type. 1146QualType Sema::BuildPointerType(QualType T, 1147 SourceLocation Loc, DeclarationName Entity) { 1148 if (T->isReferenceType()) { 1149 // C++ 8.3.2p4: There shall be no ... pointers to references ... 1150 Diag(Loc, diag::err_illegal_decl_pointer_to_reference) 1151 << getPrintableNameForEntity(Entity) << T; 1152 return QualType(); 1153 } 1154 1155 assert(!T->isObjCObjectType() && "Should build ObjCObjectPointerType"); 1156 1157 // In ARC, it is forbidden to build pointers to unqualified pointers. 1158 if (getLangOpts().ObjCAutoRefCount) 1159 T = inferARCLifetimeForPointee(*this, T, Loc, /*reference*/ false); 1160 1161 // Build the pointer type. 1162 return Context.getPointerType(T); 1163} 1164 1165/// \brief Build a reference type. 1166/// 1167/// \param T The type to which we'll be building a reference. 1168/// 1169/// \param Loc The location of the entity whose type involves this 1170/// reference type or, if there is no such entity, the location of the 1171/// type that will have reference type. 1172/// 1173/// \param Entity The name of the entity that involves the reference 1174/// type, if known. 1175/// 1176/// \returns A suitable reference type, if there are no 1177/// errors. Otherwise, returns a NULL type. 1178QualType Sema::BuildReferenceType(QualType T, bool SpelledAsLValue, 1179 SourceLocation Loc, 1180 DeclarationName Entity) { 1181 assert(Context.getCanonicalType(T) != Context.OverloadTy && 1182 "Unresolved overloaded function type"); 1183 1184 // C++0x [dcl.ref]p6: 1185 // If a typedef (7.1.3), a type template-parameter (14.3.1), or a 1186 // decltype-specifier (7.1.6.2) denotes a type TR that is a reference to a 1187 // type T, an attempt to create the type "lvalue reference to cv TR" creates 1188 // the type "lvalue reference to T", while an attempt to create the type 1189 // "rvalue reference to cv TR" creates the type TR. 1190 bool LValueRef = SpelledAsLValue || T->getAs<LValueReferenceType>(); 1191 1192 // C++ [dcl.ref]p4: There shall be no references to references. 1193 // 1194 // According to C++ DR 106, references to references are only 1195 // diagnosed when they are written directly (e.g., "int & &"), 1196 // but not when they happen via a typedef: 1197 // 1198 // typedef int& intref; 1199 // typedef intref& intref2; 1200 // 1201 // Parser::ParseDeclaratorInternal diagnoses the case where 1202 // references are written directly; here, we handle the 1203 // collapsing of references-to-references as described in C++0x. 1204 // DR 106 and 540 introduce reference-collapsing into C++98/03. 1205 1206 // C++ [dcl.ref]p1: 1207 // A declarator that specifies the type "reference to cv void" 1208 // is ill-formed. 1209 if (T->isVoidType()) { 1210 Diag(Loc, diag::err_reference_to_void); 1211 return QualType(); 1212 } 1213 1214 // In ARC, it is forbidden to build references to unqualified pointers. 1215 if (getLangOpts().ObjCAutoRefCount) 1216 T = inferARCLifetimeForPointee(*this, T, Loc, /*reference*/ true); 1217 1218 // Handle restrict on references. 1219 if (LValueRef) 1220 return Context.getLValueReferenceType(T, SpelledAsLValue); 1221 return Context.getRValueReferenceType(T); 1222} 1223 1224/// Check whether the specified array size makes the array type a VLA. If so, 1225/// return true, if not, return the size of the array in SizeVal. 1226static bool isArraySizeVLA(Sema &S, Expr *ArraySize, llvm::APSInt &SizeVal) { 1227 // If the size is an ICE, it certainly isn't a VLA. If we're in a GNU mode 1228 // (like gnu99, but not c99) accept any evaluatable value as an extension. 1229 class VLADiagnoser : public Sema::VerifyICEDiagnoser { 1230 public: 1231 VLADiagnoser() : Sema::VerifyICEDiagnoser(true) {} 1232 1233 virtual void diagnoseNotICE(Sema &S, SourceLocation Loc, SourceRange SR) { 1234 } 1235 1236 virtual void diagnoseFold(Sema &S, SourceLocation Loc, SourceRange SR) { 1237 S.Diag(Loc, diag::ext_vla_folded_to_constant) << SR; 1238 } 1239 } Diagnoser; 1240 1241 return S.VerifyIntegerConstantExpression(ArraySize, &SizeVal, Diagnoser, 1242 S.LangOpts.GNUMode).isInvalid(); 1243} 1244 1245 1246/// \brief Build an array type. 1247/// 1248/// \param T The type of each element in the array. 1249/// 1250/// \param ASM C99 array size modifier (e.g., '*', 'static'). 1251/// 1252/// \param ArraySize Expression describing the size of the array. 1253/// 1254/// \param Brackets The range from the opening '[' to the closing ']'. 1255/// 1256/// \param Entity The name of the entity that involves the array 1257/// type, if known. 1258/// 1259/// \returns A suitable array type, if there are no errors. Otherwise, 1260/// returns a NULL type. 1261QualType Sema::BuildArrayType(QualType T, ArrayType::ArraySizeModifier ASM, 1262 Expr *ArraySize, unsigned Quals, 1263 SourceRange Brackets, DeclarationName Entity) { 1264 1265 SourceLocation Loc = Brackets.getBegin(); 1266 if (getLangOpts().CPlusPlus) { 1267 // C++ [dcl.array]p1: 1268 // T is called the array element type; this type shall not be a reference 1269 // type, the (possibly cv-qualified) type void, a function type or an 1270 // abstract class type. 1271 // 1272 // C++ [dcl.array]p3: 1273 // When several "array of" specifications are adjacent, [...] only the 1274 // first of the constant expressions that specify the bounds of the arrays 1275 // may be omitted. 1276 // 1277 // Note: function types are handled in the common path with C. 1278 if (T->isReferenceType()) { 1279 Diag(Loc, diag::err_illegal_decl_array_of_references) 1280 << getPrintableNameForEntity(Entity) << T; 1281 return QualType(); 1282 } 1283 1284 if (T->isVoidType() || T->isIncompleteArrayType()) { 1285 Diag(Loc, diag::err_illegal_decl_array_incomplete_type) << T; 1286 return QualType(); 1287 } 1288 1289 if (RequireNonAbstractType(Brackets.getBegin(), T, 1290 diag::err_array_of_abstract_type)) 1291 return QualType(); 1292 1293 } else { 1294 // C99 6.7.5.2p1: If the element type is an incomplete or function type, 1295 // reject it (e.g. void ary[7], struct foo ary[7], void ary[7]()) 1296 if (RequireCompleteType(Loc, T, 1297 diag::err_illegal_decl_array_incomplete_type)) 1298 return QualType(); 1299 } 1300 1301 if (T->isFunctionType()) { 1302 Diag(Loc, diag::err_illegal_decl_array_of_functions) 1303 << getPrintableNameForEntity(Entity) << T; 1304 return QualType(); 1305 } 1306 1307 if (T->getContainedAutoType()) { 1308 Diag(Loc, diag::err_illegal_decl_array_of_auto) 1309 << getPrintableNameForEntity(Entity) << T; 1310 return QualType(); 1311 } 1312 1313 if (const RecordType *EltTy = T->getAs<RecordType>()) { 1314 // If the element type is a struct or union that contains a variadic 1315 // array, accept it as a GNU extension: C99 6.7.2.1p2. 1316 if (EltTy->getDecl()->hasFlexibleArrayMember()) 1317 Diag(Loc, diag::ext_flexible_array_in_array) << T; 1318 } else if (T->isObjCObjectType()) { 1319 Diag(Loc, diag::err_objc_array_of_interfaces) << T; 1320 return QualType(); 1321 } 1322 1323 // Do placeholder conversions on the array size expression. 1324 if (ArraySize && ArraySize->hasPlaceholderType()) { 1325 ExprResult Result = CheckPlaceholderExpr(ArraySize); 1326 if (Result.isInvalid()) return QualType(); 1327 ArraySize = Result.take(); 1328 } 1329 1330 // Do lvalue-to-rvalue conversions on the array size expression. 1331 if (ArraySize && !ArraySize->isRValue()) { 1332 ExprResult Result = DefaultLvalueConversion(ArraySize); 1333 if (Result.isInvalid()) 1334 return QualType(); 1335 1336 ArraySize = Result.take(); 1337 } 1338 1339 // C99 6.7.5.2p1: The size expression shall have integer type. 1340 // C++11 allows contextual conversions to such types. 1341 if (!getLangOpts().CPlusPlus0x && 1342 ArraySize && !ArraySize->isTypeDependent() && 1343 !ArraySize->getType()->isIntegralOrUnscopedEnumerationType()) { 1344 Diag(ArraySize->getLocStart(), diag::err_array_size_non_int) 1345 << ArraySize->getType() << ArraySize->getSourceRange(); 1346 return QualType(); 1347 } 1348 1349 llvm::APSInt ConstVal(Context.getTypeSize(Context.getSizeType())); 1350 if (!ArraySize) { 1351 if (ASM == ArrayType::Star) 1352 T = Context.getVariableArrayType(T, 0, ASM, Quals, Brackets); 1353 else 1354 T = Context.getIncompleteArrayType(T, ASM, Quals); 1355 } else if (ArraySize->isTypeDependent() || ArraySize->isValueDependent()) { 1356 T = Context.getDependentSizedArrayType(T, ArraySize, ASM, Quals, Brackets); 1357 } else if ((!T->isDependentType() && !T->isIncompleteType() && 1358 !T->isConstantSizeType()) || 1359 isArraySizeVLA(*this, ArraySize, ConstVal)) { 1360 // Even in C++11, don't allow contextual conversions in the array bound 1361 // of a VLA. 1362 if (getLangOpts().CPlusPlus0x && 1363 !ArraySize->getType()->isIntegralOrUnscopedEnumerationType()) { 1364 Diag(ArraySize->getLocStart(), diag::err_array_size_non_int) 1365 << ArraySize->getType() << ArraySize->getSourceRange(); 1366 return QualType(); 1367 } 1368 1369 // C99: an array with an element type that has a non-constant-size is a VLA. 1370 // C99: an array with a non-ICE size is a VLA. We accept any expression 1371 // that we can fold to a non-zero positive value as an extension. 1372 T = Context.getVariableArrayType(T, ArraySize, ASM, Quals, Brackets); 1373 } else { 1374 // C99 6.7.5.2p1: If the expression is a constant expression, it shall 1375 // have a value greater than zero. 1376 if (ConstVal.isSigned() && ConstVal.isNegative()) { 1377 if (Entity) 1378 Diag(ArraySize->getLocStart(), diag::err_decl_negative_array_size) 1379 << getPrintableNameForEntity(Entity) << ArraySize->getSourceRange(); 1380 else 1381 Diag(ArraySize->getLocStart(), diag::err_typecheck_negative_array_size) 1382 << ArraySize->getSourceRange(); 1383 return QualType(); 1384 } 1385 if (ConstVal == 0) { 1386 // GCC accepts zero sized static arrays. We allow them when 1387 // we're not in a SFINAE context. 1388 Diag(ArraySize->getLocStart(), 1389 isSFINAEContext()? diag::err_typecheck_zero_array_size 1390 : diag::ext_typecheck_zero_array_size) 1391 << ArraySize->getSourceRange(); 1392 1393 if (ASM == ArrayType::Static) { 1394 Diag(ArraySize->getLocStart(), 1395 diag::warn_typecheck_zero_static_array_size) 1396 << ArraySize->getSourceRange(); 1397 ASM = ArrayType::Normal; 1398 } 1399 } else if (!T->isDependentType() && !T->isVariablyModifiedType() && 1400 !T->isIncompleteType()) { 1401 // Is the array too large? 1402 unsigned ActiveSizeBits 1403 = ConstantArrayType::getNumAddressingBits(Context, T, ConstVal); 1404 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) 1405 Diag(ArraySize->getLocStart(), diag::err_array_too_large) 1406 << ConstVal.toString(10) 1407 << ArraySize->getSourceRange(); 1408 } 1409 1410 T = Context.getConstantArrayType(T, ConstVal, ASM, Quals); 1411 } 1412 // If this is not C99, extwarn about VLA's and C99 array size modifiers. 1413 if (!getLangOpts().C99) { 1414 if (T->isVariableArrayType()) { 1415 // Prohibit the use of non-POD types in VLAs. 1416 QualType BaseT = Context.getBaseElementType(T); 1417 if (!T->isDependentType() && 1418 !BaseT.isPODType(Context) && 1419 !BaseT->isObjCLifetimeType()) { 1420 Diag(Loc, diag::err_vla_non_pod) 1421 << BaseT; 1422 return QualType(); 1423 } 1424 // Prohibit the use of VLAs during template argument deduction. 1425 else if (isSFINAEContext()) { 1426 Diag(Loc, diag::err_vla_in_sfinae); 1427 return QualType(); 1428 } 1429 // Just extwarn about VLAs. 1430 else 1431 Diag(Loc, diag::ext_vla); 1432 } else if (ASM != ArrayType::Normal || Quals != 0) 1433 Diag(Loc, 1434 getLangOpts().CPlusPlus? diag::err_c99_array_usage_cxx 1435 : diag::ext_c99_array_usage) << ASM; 1436 } 1437 1438 return T; 1439} 1440 1441/// \brief Build an ext-vector type. 1442/// 1443/// Run the required checks for the extended vector type. 1444QualType Sema::BuildExtVectorType(QualType T, Expr *ArraySize, 1445 SourceLocation AttrLoc) { 1446 // unlike gcc's vector_size attribute, we do not allow vectors to be defined 1447 // in conjunction with complex types (pointers, arrays, functions, etc.). 1448 if (!T->isDependentType() && 1449 !T->isIntegerType() && !T->isRealFloatingType()) { 1450 Diag(AttrLoc, diag::err_attribute_invalid_vector_type) << T; 1451 return QualType(); 1452 } 1453 1454 if (!ArraySize->isTypeDependent() && !ArraySize->isValueDependent()) { 1455 llvm::APSInt vecSize(32); 1456 if (!ArraySize->isIntegerConstantExpr(vecSize, Context)) { 1457 Diag(AttrLoc, diag::err_attribute_argument_not_int) 1458 << "ext_vector_type" << ArraySize->getSourceRange(); 1459 return QualType(); 1460 } 1461 1462 // unlike gcc's vector_size attribute, the size is specified as the 1463 // number of elements, not the number of bytes. 1464 unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue()); 1465 1466 if (vectorSize == 0) { 1467 Diag(AttrLoc, diag::err_attribute_zero_size) 1468 << ArraySize->getSourceRange(); 1469 return QualType(); 1470 } 1471 1472 return Context.getExtVectorType(T, vectorSize); 1473 } 1474 1475 return Context.getDependentSizedExtVectorType(T, ArraySize, AttrLoc); 1476} 1477 1478/// \brief Build a function type. 1479/// 1480/// This routine checks the function type according to C++ rules and 1481/// under the assumption that the result type and parameter types have 1482/// just been instantiated from a template. It therefore duplicates 1483/// some of the behavior of GetTypeForDeclarator, but in a much 1484/// simpler form that is only suitable for this narrow use case. 1485/// 1486/// \param T The return type of the function. 1487/// 1488/// \param ParamTypes The parameter types of the function. This array 1489/// will be modified to account for adjustments to the types of the 1490/// function parameters. 1491/// 1492/// \param NumParamTypes The number of parameter types in ParamTypes. 1493/// 1494/// \param Variadic Whether this is a variadic function type. 1495/// 1496/// \param HasTrailingReturn Whether this function has a trailing return type. 1497/// 1498/// \param Quals The cvr-qualifiers to be applied to the function type. 1499/// 1500/// \param Loc The location of the entity whose type involves this 1501/// function type or, if there is no such entity, the location of the 1502/// type that will have function type. 1503/// 1504/// \param Entity The name of the entity that involves the function 1505/// type, if known. 1506/// 1507/// \returns A suitable function type, if there are no 1508/// errors. Otherwise, returns a NULL type. 1509QualType Sema::BuildFunctionType(QualType T, 1510 QualType *ParamTypes, 1511 unsigned NumParamTypes, 1512 bool Variadic, bool HasTrailingReturn, 1513 unsigned Quals, 1514 RefQualifierKind RefQualifier, 1515 SourceLocation Loc, DeclarationName Entity, 1516 FunctionType::ExtInfo Info) { 1517 if (T->isArrayType() || T->isFunctionType()) { 1518 Diag(Loc, diag::err_func_returning_array_function) 1519 << T->isFunctionType() << T; 1520 return QualType(); 1521 } 1522 1523 // Functions cannot return half FP. 1524 if (T->isHalfType()) { 1525 Diag(Loc, diag::err_parameters_retval_cannot_have_fp16_type) << 1 << 1526 FixItHint::CreateInsertion(Loc, "*"); 1527 return QualType(); 1528 } 1529 1530 bool Invalid = false; 1531 for (unsigned Idx = 0; Idx < NumParamTypes; ++Idx) { 1532 // FIXME: Loc is too inprecise here, should use proper locations for args. 1533 QualType ParamType = Context.getAdjustedParameterType(ParamTypes[Idx]); 1534 if (ParamType->isVoidType()) { 1535 Diag(Loc, diag::err_param_with_void_type); 1536 Invalid = true; 1537 } else if (ParamType->isHalfType()) { 1538 // Disallow half FP arguments. 1539 Diag(Loc, diag::err_parameters_retval_cannot_have_fp16_type) << 0 << 1540 FixItHint::CreateInsertion(Loc, "*"); 1541 Invalid = true; 1542 } 1543 1544 ParamTypes[Idx] = ParamType; 1545 } 1546 1547 if (Invalid) 1548 return QualType(); 1549 1550 FunctionProtoType::ExtProtoInfo EPI; 1551 EPI.Variadic = Variadic; 1552 EPI.HasTrailingReturn = HasTrailingReturn; 1553 EPI.TypeQuals = Quals; 1554 EPI.RefQualifier = RefQualifier; 1555 EPI.ExtInfo = Info; 1556 1557 return Context.getFunctionType(T, ParamTypes, NumParamTypes, EPI); 1558} 1559 1560/// \brief Build a member pointer type \c T Class::*. 1561/// 1562/// \param T the type to which the member pointer refers. 1563/// \param Class the class type into which the member pointer points. 1564/// \param Loc the location where this type begins 1565/// \param Entity the name of the entity that will have this member pointer type 1566/// 1567/// \returns a member pointer type, if successful, or a NULL type if there was 1568/// an error. 1569QualType Sema::BuildMemberPointerType(QualType T, QualType Class, 1570 SourceLocation Loc, 1571 DeclarationName Entity) { 1572 // Verify that we're not building a pointer to pointer to function with 1573 // exception specification. 1574 if (CheckDistantExceptionSpec(T)) { 1575 Diag(Loc, diag::err_distant_exception_spec); 1576 1577 // FIXME: If we're doing this as part of template instantiation, 1578 // we should return immediately. 1579 1580 // Build the type anyway, but use the canonical type so that the 1581 // exception specifiers are stripped off. 1582 T = Context.getCanonicalType(T); 1583 } 1584 1585 // C++ 8.3.3p3: A pointer to member shall not point to ... a member 1586 // with reference type, or "cv void." 1587 if (T->isReferenceType()) { 1588 Diag(Loc, diag::err_illegal_decl_mempointer_to_reference) 1589 << (Entity? Entity.getAsString() : "type name") << T; 1590 return QualType(); 1591 } 1592 1593 if (T->isVoidType()) { 1594 Diag(Loc, diag::err_illegal_decl_mempointer_to_void) 1595 << (Entity? Entity.getAsString() : "type name"); 1596 return QualType(); 1597 } 1598 1599 if (!Class->isDependentType() && !Class->isRecordType()) { 1600 Diag(Loc, diag::err_mempointer_in_nonclass_type) << Class; 1601 return QualType(); 1602 } 1603 1604 // In the Microsoft ABI, the class is allowed to be an incomplete 1605 // type. In such cases, the compiler makes a worst-case assumption. 1606 // We make no such assumption right now, so emit an error if the 1607 // class isn't a complete type. 1608 if (Context.getTargetInfo().getCXXABI() == CXXABI_Microsoft && 1609 RequireCompleteType(Loc, Class, diag::err_incomplete_type)) 1610 return QualType(); 1611 1612 return Context.getMemberPointerType(T, Class.getTypePtr()); 1613} 1614 1615/// \brief Build a block pointer type. 1616/// 1617/// \param T The type to which we'll be building a block pointer. 1618/// 1619/// \param Loc The source location, used for diagnostics. 1620/// 1621/// \param Entity The name of the entity that involves the block pointer 1622/// type, if known. 1623/// 1624/// \returns A suitable block pointer type, if there are no 1625/// errors. Otherwise, returns a NULL type. 1626QualType Sema::BuildBlockPointerType(QualType T, 1627 SourceLocation Loc, 1628 DeclarationName Entity) { 1629 if (!T->isFunctionType()) { 1630 Diag(Loc, diag::err_nonfunction_block_type); 1631 return QualType(); 1632 } 1633 1634 return Context.getBlockPointerType(T); 1635} 1636 1637QualType Sema::GetTypeFromParser(ParsedType Ty, TypeSourceInfo **TInfo) { 1638 QualType QT = Ty.get(); 1639 if (QT.isNull()) { 1640 if (TInfo) *TInfo = 0; 1641 return QualType(); 1642 } 1643 1644 TypeSourceInfo *DI = 0; 1645 if (const LocInfoType *LIT = dyn_cast<LocInfoType>(QT)) { 1646 QT = LIT->getType(); 1647 DI = LIT->getTypeSourceInfo(); 1648 } 1649 1650 if (TInfo) *TInfo = DI; 1651 return QT; 1652} 1653 1654static void transferARCOwnershipToDeclaratorChunk(TypeProcessingState &state, 1655 Qualifiers::ObjCLifetime ownership, 1656 unsigned chunkIndex); 1657 1658/// Given that this is the declaration of a parameter under ARC, 1659/// attempt to infer attributes and such for pointer-to-whatever 1660/// types. 1661static void inferARCWriteback(TypeProcessingState &state, 1662 QualType &declSpecType) { 1663 Sema &S = state.getSema(); 1664 Declarator &declarator = state.getDeclarator(); 1665 1666 // TODO: should we care about decl qualifiers? 1667 1668 // Check whether the declarator has the expected form. We walk 1669 // from the inside out in order to make the block logic work. 1670 unsigned outermostPointerIndex = 0; 1671 bool isBlockPointer = false; 1672 unsigned numPointers = 0; 1673 for (unsigned i = 0, e = declarator.getNumTypeObjects(); i != e; ++i) { 1674 unsigned chunkIndex = i; 1675 DeclaratorChunk &chunk = declarator.getTypeObject(chunkIndex); 1676 switch (chunk.Kind) { 1677 case DeclaratorChunk::Paren: 1678 // Ignore parens. 1679 break; 1680 1681 case DeclaratorChunk::Reference: 1682 case DeclaratorChunk::Pointer: 1683 // Count the number of pointers. Treat references 1684 // interchangeably as pointers; if they're mis-ordered, normal 1685 // type building will discover that. 1686 outermostPointerIndex = chunkIndex; 1687 numPointers++; 1688 break; 1689 1690 case DeclaratorChunk::BlockPointer: 1691 // If we have a pointer to block pointer, that's an acceptable 1692 // indirect reference; anything else is not an application of 1693 // the rules. 1694 if (numPointers != 1) return; 1695 numPointers++; 1696 outermostPointerIndex = chunkIndex; 1697 isBlockPointer = true; 1698 1699 // We don't care about pointer structure in return values here. 1700 goto done; 1701 1702 case DeclaratorChunk::Array: // suppress if written (id[])? 1703 case DeclaratorChunk::Function: 1704 case DeclaratorChunk::MemberPointer: 1705 return; 1706 } 1707 } 1708 done: 1709 1710 // If we have *one* pointer, then we want to throw the qualifier on 1711 // the declaration-specifiers, which means that it needs to be a 1712 // retainable object type. 1713 if (numPointers == 1) { 1714 // If it's not a retainable object type, the rule doesn't apply. 1715 if (!declSpecType->isObjCRetainableType()) return; 1716 1717 // If it already has lifetime, don't do anything. 1718 if (declSpecType.getObjCLifetime()) return; 1719 1720 // Otherwise, modify the type in-place. 1721 Qualifiers qs; 1722 1723 if (declSpecType->isObjCARCImplicitlyUnretainedType()) 1724 qs.addObjCLifetime(Qualifiers::OCL_ExplicitNone); 1725 else 1726 qs.addObjCLifetime(Qualifiers::OCL_Autoreleasing); 1727 declSpecType = S.Context.getQualifiedType(declSpecType, qs); 1728 1729 // If we have *two* pointers, then we want to throw the qualifier on 1730 // the outermost pointer. 1731 } else if (numPointers == 2) { 1732 // If we don't have a block pointer, we need to check whether the 1733 // declaration-specifiers gave us something that will turn into a 1734 // retainable object pointer after we slap the first pointer on it. 1735 if (!isBlockPointer && !declSpecType->isObjCObjectType()) 1736 return; 1737 1738 // Look for an explicit lifetime attribute there. 1739 DeclaratorChunk &chunk = declarator.getTypeObject(outermostPointerIndex); 1740 if (chunk.Kind != DeclaratorChunk::Pointer && 1741 chunk.Kind != DeclaratorChunk::BlockPointer) 1742 return; 1743 for (const AttributeList *attr = chunk.getAttrs(); attr; 1744 attr = attr->getNext()) 1745 if (attr->getKind() == AttributeList::AT_ObjCOwnership) 1746 return; 1747 1748 transferARCOwnershipToDeclaratorChunk(state, Qualifiers::OCL_Autoreleasing, 1749 outermostPointerIndex); 1750 1751 // Any other number of pointers/references does not trigger the rule. 1752 } else return; 1753 1754 // TODO: mark whether we did this inference? 1755} 1756 1757static void DiagnoseIgnoredQualifiers(unsigned Quals, 1758 SourceLocation ConstQualLoc, 1759 SourceLocation VolatileQualLoc, 1760 SourceLocation RestrictQualLoc, 1761 Sema& S) { 1762 std::string QualStr; 1763 unsigned NumQuals = 0; 1764 SourceLocation Loc; 1765 1766 FixItHint ConstFixIt; 1767 FixItHint VolatileFixIt; 1768 FixItHint RestrictFixIt; 1769 1770 const SourceManager &SM = S.getSourceManager(); 1771 1772 // FIXME: The locations here are set kind of arbitrarily. It'd be nicer to 1773 // find a range and grow it to encompass all the qualifiers, regardless of 1774 // the order in which they textually appear. 1775 if (Quals & Qualifiers::Const) { 1776 ConstFixIt = FixItHint::CreateRemoval(ConstQualLoc); 1777 QualStr = "const"; 1778 ++NumQuals; 1779 if (!Loc.isValid() || SM.isBeforeInTranslationUnit(ConstQualLoc, Loc)) 1780 Loc = ConstQualLoc; 1781 } 1782 if (Quals & Qualifiers::Volatile) { 1783 VolatileFixIt = FixItHint::CreateRemoval(VolatileQualLoc); 1784 QualStr += (NumQuals == 0 ? "volatile" : " volatile"); 1785 ++NumQuals; 1786 if (!Loc.isValid() || SM.isBeforeInTranslationUnit(VolatileQualLoc, Loc)) 1787 Loc = VolatileQualLoc; 1788 } 1789 if (Quals & Qualifiers::Restrict) { 1790 RestrictFixIt = FixItHint::CreateRemoval(RestrictQualLoc); 1791 QualStr += (NumQuals == 0 ? "restrict" : " restrict"); 1792 ++NumQuals; 1793 if (!Loc.isValid() || SM.isBeforeInTranslationUnit(RestrictQualLoc, Loc)) 1794 Loc = RestrictQualLoc; 1795 } 1796 1797 assert(NumQuals > 0 && "No known qualifiers?"); 1798 1799 S.Diag(Loc, diag::warn_qual_return_type) 1800 << QualStr << NumQuals << ConstFixIt << VolatileFixIt << RestrictFixIt; 1801} 1802 1803static QualType GetDeclSpecTypeForDeclarator(TypeProcessingState &state, 1804 TypeSourceInfo *&ReturnTypeInfo) { 1805 Sema &SemaRef = state.getSema(); 1806 Declarator &D = state.getDeclarator(); 1807 QualType T; 1808 ReturnTypeInfo = 0; 1809 1810 // The TagDecl owned by the DeclSpec. 1811 TagDecl *OwnedTagDecl = 0; 1812 1813 switch (D.getName().getKind()) { 1814 case UnqualifiedId::IK_ImplicitSelfParam: 1815 case UnqualifiedId::IK_OperatorFunctionId: 1816 case UnqualifiedId::IK_Identifier: 1817 case UnqualifiedId::IK_LiteralOperatorId: 1818 case UnqualifiedId::IK_TemplateId: 1819 T = ConvertDeclSpecToType(state); 1820 1821 if (!D.isInvalidType() && D.getDeclSpec().isTypeSpecOwned()) { 1822 OwnedTagDecl = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 1823 // Owned declaration is embedded in declarator. 1824 OwnedTagDecl->setEmbeddedInDeclarator(true); 1825 } 1826 break; 1827 1828 case UnqualifiedId::IK_ConstructorName: 1829 case UnqualifiedId::IK_ConstructorTemplateId: 1830 case UnqualifiedId::IK_DestructorName: 1831 // Constructors and destructors don't have return types. Use 1832 // "void" instead. 1833 T = SemaRef.Context.VoidTy; 1834 if (AttributeList *attrs = D.getDeclSpec().getAttributes().getList()) 1835 processTypeAttrs(state, T, true, attrs); 1836 break; 1837 1838 case UnqualifiedId::IK_ConversionFunctionId: 1839 // The result type of a conversion function is the type that it 1840 // converts to. 1841 T = SemaRef.GetTypeFromParser(D.getName().ConversionFunctionId, 1842 &ReturnTypeInfo); 1843 break; 1844 } 1845 1846 if (D.getAttributes()) 1847 distributeTypeAttrsFromDeclarator(state, T); 1848 1849 // C++11 [dcl.spec.auto]p5: reject 'auto' if it is not in an allowed context. 1850 // In C++11, a function declarator using 'auto' must have a trailing return 1851 // type (this is checked later) and we can skip this. In other languages 1852 // using auto, we need to check regardless. 1853 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto && 1854 (!SemaRef.getLangOpts().CPlusPlus0x || !D.isFunctionDeclarator())) { 1855 int Error = -1; 1856 1857 switch (D.getContext()) { 1858 case Declarator::KNRTypeListContext: 1859 llvm_unreachable("K&R type lists aren't allowed in C++"); 1860 case Declarator::LambdaExprContext: 1861 llvm_unreachable("Can't specify a type specifier in lambda grammar"); 1862 case Declarator::ObjCParameterContext: 1863 case Declarator::ObjCResultContext: 1864 case Declarator::PrototypeContext: 1865 Error = 0; // Function prototype 1866 break; 1867 case Declarator::MemberContext: 1868 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_static) 1869 break; 1870 switch (cast<TagDecl>(SemaRef.CurContext)->getTagKind()) { 1871 case TTK_Enum: llvm_unreachable("unhandled tag kind"); 1872 case TTK_Struct: Error = 1; /* Struct member */ break; 1873 case TTK_Union: Error = 2; /* Union member */ break; 1874 case TTK_Class: Error = 3; /* Class member */ break; 1875 case TTK_Interface: Error = 4; /* Interface member */ break; 1876 } 1877 break; 1878 case Declarator::CXXCatchContext: 1879 case Declarator::ObjCCatchContext: 1880 Error = 5; // Exception declaration 1881 break; 1882 case Declarator::TemplateParamContext: 1883 Error = 6; // Template parameter 1884 break; 1885 case Declarator::BlockLiteralContext: 1886 Error = 7; // Block literal 1887 break; 1888 case Declarator::TemplateTypeArgContext: 1889 Error = 8; // Template type argument 1890 break; 1891 case Declarator::AliasDeclContext: 1892 case Declarator::AliasTemplateContext: 1893 Error = 10; // Type alias 1894 break; 1895 case Declarator::TrailingReturnContext: 1896 Error = 11; // Function return type 1897 break; 1898 case Declarator::TypeNameContext: 1899 Error = 12; // Generic 1900 break; 1901 case Declarator::FileContext: 1902 case Declarator::BlockContext: 1903 case Declarator::ForContext: 1904 case Declarator::ConditionContext: 1905 case Declarator::CXXNewContext: 1906 break; 1907 } 1908 1909 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 1910 Error = 9; 1911 1912 // In Objective-C it is an error to use 'auto' on a function declarator. 1913 if (D.isFunctionDeclarator()) 1914 Error = 11; 1915 1916 // C++11 [dcl.spec.auto]p2: 'auto' is always fine if the declarator 1917 // contains a trailing return type. That is only legal at the outermost 1918 // level. Check all declarator chunks (outermost first) anyway, to give 1919 // better diagnostics. 1920 if (SemaRef.getLangOpts().CPlusPlus0x && Error != -1) { 1921 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 1922 unsigned chunkIndex = e - i - 1; 1923 state.setCurrentChunkIndex(chunkIndex); 1924 DeclaratorChunk &DeclType = D.getTypeObject(chunkIndex); 1925 if (DeclType.Kind == DeclaratorChunk::Function) { 1926 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun; 1927 if (FTI.hasTrailingReturnType()) { 1928 Error = -1; 1929 break; 1930 } 1931 } 1932 } 1933 } 1934 1935 if (Error != -1) { 1936 SemaRef.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 1937 diag::err_auto_not_allowed) 1938 << Error; 1939 T = SemaRef.Context.IntTy; 1940 D.setInvalidType(true); 1941 } else 1942 SemaRef.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 1943 diag::warn_cxx98_compat_auto_type_specifier); 1944 } 1945 1946 if (SemaRef.getLangOpts().CPlusPlus && 1947 OwnedTagDecl && OwnedTagDecl->isCompleteDefinition()) { 1948 // Check the contexts where C++ forbids the declaration of a new class 1949 // or enumeration in a type-specifier-seq. 1950 switch (D.getContext()) { 1951 case Declarator::TrailingReturnContext: 1952 // Class and enumeration definitions are syntactically not allowed in 1953 // trailing return types. 1954 llvm_unreachable("parser should not have allowed this"); 1955 break; 1956 case Declarator::FileContext: 1957 case Declarator::MemberContext: 1958 case Declarator::BlockContext: 1959 case Declarator::ForContext: 1960 case Declarator::BlockLiteralContext: 1961 case Declarator::LambdaExprContext: 1962 // C++11 [dcl.type]p3: 1963 // A type-specifier-seq shall not define a class or enumeration unless 1964 // it appears in the type-id of an alias-declaration (7.1.3) that is not 1965 // the declaration of a template-declaration. 1966 case Declarator::AliasDeclContext: 1967 break; 1968 case Declarator::AliasTemplateContext: 1969 SemaRef.Diag(OwnedTagDecl->getLocation(), 1970 diag::err_type_defined_in_alias_template) 1971 << SemaRef.Context.getTypeDeclType(OwnedTagDecl); 1972 break; 1973 case Declarator::TypeNameContext: 1974 case Declarator::TemplateParamContext: 1975 case Declarator::CXXNewContext: 1976 case Declarator::CXXCatchContext: 1977 case Declarator::ObjCCatchContext: 1978 case Declarator::TemplateTypeArgContext: 1979 SemaRef.Diag(OwnedTagDecl->getLocation(), 1980 diag::err_type_defined_in_type_specifier) 1981 << SemaRef.Context.getTypeDeclType(OwnedTagDecl); 1982 break; 1983 case Declarator::PrototypeContext: 1984 case Declarator::ObjCParameterContext: 1985 case Declarator::ObjCResultContext: 1986 case Declarator::KNRTypeListContext: 1987 // C++ [dcl.fct]p6: 1988 // Types shall not be defined in return or parameter types. 1989 SemaRef.Diag(OwnedTagDecl->getLocation(), 1990 diag::err_type_defined_in_param_type) 1991 << SemaRef.Context.getTypeDeclType(OwnedTagDecl); 1992 break; 1993 case Declarator::ConditionContext: 1994 // C++ 6.4p2: 1995 // The type-specifier-seq shall not contain typedef and shall not declare 1996 // a new class or enumeration. 1997 SemaRef.Diag(OwnedTagDecl->getLocation(), 1998 diag::err_type_defined_in_condition); 1999 break; 2000 } 2001 } 2002 2003 return T; 2004} 2005 2006static std::string getFunctionQualifiersAsString(const FunctionProtoType *FnTy){ 2007 std::string Quals = 2008 Qualifiers::fromCVRMask(FnTy->getTypeQuals()).getAsString(); 2009 2010 switch (FnTy->getRefQualifier()) { 2011 case RQ_None: 2012 break; 2013 2014 case RQ_LValue: 2015 if (!Quals.empty()) 2016 Quals += ' '; 2017 Quals += '&'; 2018 break; 2019 2020 case RQ_RValue: 2021 if (!Quals.empty()) 2022 Quals += ' '; 2023 Quals += "&&"; 2024 break; 2025 } 2026 2027 return Quals; 2028} 2029 2030/// Check that the function type T, which has a cv-qualifier or a ref-qualifier, 2031/// can be contained within the declarator chunk DeclType, and produce an 2032/// appropriate diagnostic if not. 2033static void checkQualifiedFunction(Sema &S, QualType T, 2034 DeclaratorChunk &DeclType) { 2035 // C++98 [dcl.fct]p4 / C++11 [dcl.fct]p6: a function type with a 2036 // cv-qualifier or a ref-qualifier can only appear at the topmost level 2037 // of a type. 2038 int DiagKind = -1; 2039 switch (DeclType.Kind) { 2040 case DeclaratorChunk::Paren: 2041 case DeclaratorChunk::MemberPointer: 2042 // These cases are permitted. 2043 return; 2044 case DeclaratorChunk::Array: 2045 case DeclaratorChunk::Function: 2046 // These cases don't allow function types at all; no need to diagnose the 2047 // qualifiers separately. 2048 return; 2049 case DeclaratorChunk::BlockPointer: 2050 DiagKind = 0; 2051 break; 2052 case DeclaratorChunk::Pointer: 2053 DiagKind = 1; 2054 break; 2055 case DeclaratorChunk::Reference: 2056 DiagKind = 2; 2057 break; 2058 } 2059 2060 assert(DiagKind != -1); 2061 S.Diag(DeclType.Loc, diag::err_compound_qualified_function_type) 2062 << DiagKind << isa<FunctionType>(T.IgnoreParens()) << T 2063 << getFunctionQualifiersAsString(T->castAs<FunctionProtoType>()); 2064} 2065 2066/// Produce an approprioate diagnostic for an ambiguity between a function 2067/// declarator and a C++ direct-initializer. 2068static void warnAboutAmbiguousFunction(Sema &S, Declarator &D, 2069 DeclaratorChunk &DeclType, QualType RT) { 2070 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun; 2071 assert(FTI.isAmbiguous && "no direct-initializer / function ambiguity"); 2072 2073 // If the return type is void there is no ambiguity. 2074 if (RT->isVoidType()) 2075 return; 2076 2077 // An initializer for a non-class type can have at most one argument. 2078 if (!RT->isRecordType() && FTI.NumArgs > 1) 2079 return; 2080 2081 // An initializer for a reference must have exactly one argument. 2082 if (RT->isReferenceType() && FTI.NumArgs != 1) 2083 return; 2084 2085 // Only warn if this declarator is declaring a function at block scope, and 2086 // doesn't have a storage class (such as 'extern') specified. 2087 if (!D.isFunctionDeclarator() || 2088 D.getFunctionDefinitionKind() != FDK_Declaration || 2089 !S.CurContext->isFunctionOrMethod() || 2090 D.getDeclSpec().getStorageClassSpecAsWritten() 2091 != DeclSpec::SCS_unspecified) 2092 return; 2093 2094 // Inside a condition, a direct initializer is not permitted. We allow one to 2095 // be parsed in order to give better diagnostics in condition parsing. 2096 if (D.getContext() == Declarator::ConditionContext) 2097 return; 2098 2099 SourceRange ParenRange(DeclType.Loc, DeclType.EndLoc); 2100 2101 S.Diag(DeclType.Loc, 2102 FTI.NumArgs ? diag::warn_parens_disambiguated_as_function_declaration 2103 : diag::warn_empty_parens_are_function_decl) 2104 << ParenRange; 2105 2106 // If the declaration looks like: 2107 // T var1, 2108 // f(); 2109 // and name lookup finds a function named 'f', then the ',' was 2110 // probably intended to be a ';'. 2111 if (!D.isFirstDeclarator() && D.getIdentifier()) { 2112 FullSourceLoc Comma(D.getCommaLoc(), S.SourceMgr); 2113 FullSourceLoc Name(D.getIdentifierLoc(), S.SourceMgr); 2114 if (Comma.getFileID() != Name.getFileID() || 2115 Comma.getSpellingLineNumber() != Name.getSpellingLineNumber()) { 2116 LookupResult Result(S, D.getIdentifier(), SourceLocation(), 2117 Sema::LookupOrdinaryName); 2118 if (S.LookupName(Result, S.getCurScope())) 2119 S.Diag(D.getCommaLoc(), diag::note_empty_parens_function_call) 2120 << FixItHint::CreateReplacement(D.getCommaLoc(), ";") 2121 << D.getIdentifier(); 2122 } 2123 } 2124 2125 if (FTI.NumArgs > 0) { 2126 // For a declaration with parameters, eg. "T var(T());", suggest adding parens 2127 // around the first parameter to turn the declaration into a variable 2128 // declaration. 2129 SourceRange Range = FTI.ArgInfo[0].Param->getSourceRange(); 2130 SourceLocation B = Range.getBegin(); 2131 SourceLocation E = S.PP.getLocForEndOfToken(Range.getEnd()); 2132 // FIXME: Maybe we should suggest adding braces instead of parens 2133 // in C++11 for classes that don't have an initializer_list constructor. 2134 S.Diag(B, diag::note_additional_parens_for_variable_declaration) 2135 << FixItHint::CreateInsertion(B, "(") 2136 << FixItHint::CreateInsertion(E, ")"); 2137 } else { 2138 // For a declaration without parameters, eg. "T var();", suggest replacing the 2139 // parens with an initializer to turn the declaration into a variable 2140 // declaration. 2141 const CXXRecordDecl *RD = RT->getAsCXXRecordDecl(); 2142 2143 // Empty parens mean value-initialization, and no parens mean 2144 // default initialization. These are equivalent if the default 2145 // constructor is user-provided or if zero-initialization is a 2146 // no-op. 2147 if (RD && RD->hasDefinition() && 2148 (RD->isEmpty() || RD->hasUserProvidedDefaultConstructor())) 2149 S.Diag(DeclType.Loc, diag::note_empty_parens_default_ctor) 2150 << FixItHint::CreateRemoval(ParenRange); 2151 else { 2152 std::string Init = S.getFixItZeroInitializerForType(RT); 2153 if (Init.empty() && S.LangOpts.CPlusPlus0x) 2154 Init = "{}"; 2155 if (!Init.empty()) 2156 S.Diag(DeclType.Loc, diag::note_empty_parens_zero_initialize) 2157 << FixItHint::CreateReplacement(ParenRange, Init); 2158 } 2159 } 2160} 2161 2162static TypeSourceInfo *GetFullTypeForDeclarator(TypeProcessingState &state, 2163 QualType declSpecType, 2164 TypeSourceInfo *TInfo) { 2165 2166 QualType T = declSpecType; 2167 Declarator &D = state.getDeclarator(); 2168 Sema &S = state.getSema(); 2169 ASTContext &Context = S.Context; 2170 const LangOptions &LangOpts = S.getLangOpts(); 2171 2172 // The name we're declaring, if any. 2173 DeclarationName Name; 2174 if (D.getIdentifier()) 2175 Name = D.getIdentifier(); 2176 2177 // Does this declaration declare a typedef-name? 2178 bool IsTypedefName = 2179 D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef || 2180 D.getContext() == Declarator::AliasDeclContext || 2181 D.getContext() == Declarator::AliasTemplateContext; 2182 2183 // Does T refer to a function type with a cv-qualifier or a ref-qualifier? 2184 bool IsQualifiedFunction = T->isFunctionProtoType() && 2185 (T->castAs<FunctionProtoType>()->getTypeQuals() != 0 || 2186 T->castAs<FunctionProtoType>()->getRefQualifier() != RQ_None); 2187 2188 // Walk the DeclTypeInfo, building the recursive type as we go. 2189 // DeclTypeInfos are ordered from the identifier out, which is 2190 // opposite of what we want :). 2191 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 2192 unsigned chunkIndex = e - i - 1; 2193 state.setCurrentChunkIndex(chunkIndex); 2194 DeclaratorChunk &DeclType = D.getTypeObject(chunkIndex); 2195 if (IsQualifiedFunction) { 2196 checkQualifiedFunction(S, T, DeclType); 2197 IsQualifiedFunction = DeclType.Kind == DeclaratorChunk::Paren; 2198 } 2199 switch (DeclType.Kind) { 2200 case DeclaratorChunk::Paren: 2201 T = S.BuildParenType(T); 2202 break; 2203 case DeclaratorChunk::BlockPointer: 2204 // If blocks are disabled, emit an error. 2205 if (!LangOpts.Blocks) 2206 S.Diag(DeclType.Loc, diag::err_blocks_disable); 2207 2208 T = S.BuildBlockPointerType(T, D.getIdentifierLoc(), Name); 2209 if (DeclType.Cls.TypeQuals) 2210 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Cls.TypeQuals); 2211 break; 2212 case DeclaratorChunk::Pointer: 2213 // Verify that we're not building a pointer to pointer to function with 2214 // exception specification. 2215 if (LangOpts.CPlusPlus && S.CheckDistantExceptionSpec(T)) { 2216 S.Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 2217 D.setInvalidType(true); 2218 // Build the type anyway. 2219 } 2220 if (LangOpts.ObjC1 && T->getAs<ObjCObjectType>()) { 2221 T = Context.getObjCObjectPointerType(T); 2222 if (DeclType.Ptr.TypeQuals) 2223 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Ptr.TypeQuals); 2224 break; 2225 } 2226 T = S.BuildPointerType(T, DeclType.Loc, Name); 2227 if (DeclType.Ptr.TypeQuals) 2228 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Ptr.TypeQuals); 2229 2230 break; 2231 case DeclaratorChunk::Reference: { 2232 // Verify that we're not building a reference to pointer to function with 2233 // exception specification. 2234 if (LangOpts.CPlusPlus && S.CheckDistantExceptionSpec(T)) { 2235 S.Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 2236 D.setInvalidType(true); 2237 // Build the type anyway. 2238 } 2239 T = S.BuildReferenceType(T, DeclType.Ref.LValueRef, DeclType.Loc, Name); 2240 2241 Qualifiers Quals; 2242 if (DeclType.Ref.HasRestrict) 2243 T = S.BuildQualifiedType(T, DeclType.Loc, Qualifiers::Restrict); 2244 break; 2245 } 2246 case DeclaratorChunk::Array: { 2247 // Verify that we're not building an array of pointers to function with 2248 // exception specification. 2249 if (LangOpts.CPlusPlus && S.CheckDistantExceptionSpec(T)) { 2250 S.Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 2251 D.setInvalidType(true); 2252 // Build the type anyway. 2253 } 2254 DeclaratorChunk::ArrayTypeInfo &ATI = DeclType.Arr; 2255 Expr *ArraySize = static_cast<Expr*>(ATI.NumElts); 2256 ArrayType::ArraySizeModifier ASM; 2257 if (ATI.isStar) 2258 ASM = ArrayType::Star; 2259 else if (ATI.hasStatic) 2260 ASM = ArrayType::Static; 2261 else 2262 ASM = ArrayType::Normal; 2263 if (ASM == ArrayType::Star && !D.isPrototypeContext()) { 2264 // FIXME: This check isn't quite right: it allows star in prototypes 2265 // for function definitions, and disallows some edge cases detailed 2266 // in http://gcc.gnu.org/ml/gcc-patches/2009-02/msg00133.html 2267 S.Diag(DeclType.Loc, diag::err_array_star_outside_prototype); 2268 ASM = ArrayType::Normal; 2269 D.setInvalidType(true); 2270 } 2271 2272 // C99 6.7.5.2p1: The optional type qualifiers and the keyword static 2273 // shall appear only in a declaration of a function parameter with an 2274 // array type, ... 2275 if (ASM == ArrayType::Static || ATI.TypeQuals) { 2276 if (!(D.isPrototypeContext() || 2277 D.getContext() == Declarator::KNRTypeListContext)) { 2278 S.Diag(DeclType.Loc, diag::err_array_static_outside_prototype) << 2279 (ASM == ArrayType::Static ? "'static'" : "type qualifier"); 2280 // Remove the 'static' and the type qualifiers. 2281 if (ASM == ArrayType::Static) 2282 ASM = ArrayType::Normal; 2283 ATI.TypeQuals = 0; 2284 D.setInvalidType(true); 2285 } 2286 2287 // C99 6.7.5.2p1: ... and then only in the outermost array type 2288 // derivation. 2289 unsigned x = chunkIndex; 2290 while (x != 0) { 2291 // Walk outwards along the declarator chunks. 2292 x--; 2293 const DeclaratorChunk &DC = D.getTypeObject(x); 2294 switch (DC.Kind) { 2295 case DeclaratorChunk::Paren: 2296 continue; 2297 case DeclaratorChunk::Array: 2298 case DeclaratorChunk::Pointer: 2299 case DeclaratorChunk::Reference: 2300 case DeclaratorChunk::MemberPointer: 2301 S.Diag(DeclType.Loc, diag::err_array_static_not_outermost) << 2302 (ASM == ArrayType::Static ? "'static'" : "type qualifier"); 2303 if (ASM == ArrayType::Static) 2304 ASM = ArrayType::Normal; 2305 ATI.TypeQuals = 0; 2306 D.setInvalidType(true); 2307 break; 2308 case DeclaratorChunk::Function: 2309 case DeclaratorChunk::BlockPointer: 2310 // These are invalid anyway, so just ignore. 2311 break; 2312 } 2313 } 2314 } 2315 2316 T = S.BuildArrayType(T, ASM, ArraySize, ATI.TypeQuals, 2317 SourceRange(DeclType.Loc, DeclType.EndLoc), Name); 2318 break; 2319 } 2320 case DeclaratorChunk::Function: { 2321 // If the function declarator has a prototype (i.e. it is not () and 2322 // does not have a K&R-style identifier list), then the arguments are part 2323 // of the type, otherwise the argument list is (). 2324 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun; 2325 IsQualifiedFunction = FTI.TypeQuals || FTI.hasRefQualifier(); 2326 2327 // Check for auto functions and trailing return type and adjust the 2328 // return type accordingly. 2329 if (!D.isInvalidType()) { 2330 // trailing-return-type is only required if we're declaring a function, 2331 // and not, for instance, a pointer to a function. 2332 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto && 2333 !FTI.hasTrailingReturnType() && chunkIndex == 0) { 2334 S.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 2335 diag::err_auto_missing_trailing_return); 2336 T = Context.IntTy; 2337 D.setInvalidType(true); 2338 } else if (FTI.hasTrailingReturnType()) { 2339 // T must be exactly 'auto' at this point. See CWG issue 681. 2340 if (isa<ParenType>(T)) { 2341 S.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 2342 diag::err_trailing_return_in_parens) 2343 << T << D.getDeclSpec().getSourceRange(); 2344 D.setInvalidType(true); 2345 } else if (D.getContext() != Declarator::LambdaExprContext && 2346 (T.hasQualifiers() || !isa<AutoType>(T))) { 2347 S.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 2348 diag::err_trailing_return_without_auto) 2349 << T << D.getDeclSpec().getSourceRange(); 2350 D.setInvalidType(true); 2351 } 2352 T = S.GetTypeFromParser(FTI.getTrailingReturnType(), &TInfo); 2353 if (T.isNull()) { 2354 // An error occurred parsing the trailing return type. 2355 T = Context.IntTy; 2356 D.setInvalidType(true); 2357 } 2358 } 2359 } 2360 2361 // C99 6.7.5.3p1: The return type may not be a function or array type. 2362 // For conversion functions, we'll diagnose this particular error later. 2363 if ((T->isArrayType() || T->isFunctionType()) && 2364 (D.getName().getKind() != UnqualifiedId::IK_ConversionFunctionId)) { 2365 unsigned diagID = diag::err_func_returning_array_function; 2366 // Last processing chunk in block context means this function chunk 2367 // represents the block. 2368 if (chunkIndex == 0 && 2369 D.getContext() == Declarator::BlockLiteralContext) 2370 diagID = diag::err_block_returning_array_function; 2371 S.Diag(DeclType.Loc, diagID) << T->isFunctionType() << T; 2372 T = Context.IntTy; 2373 D.setInvalidType(true); 2374 } 2375 2376 // Do not allow returning half FP value. 2377 // FIXME: This really should be in BuildFunctionType. 2378 if (T->isHalfType()) { 2379 S.Diag(D.getIdentifierLoc(), 2380 diag::err_parameters_retval_cannot_have_fp16_type) << 1 2381 << FixItHint::CreateInsertion(D.getIdentifierLoc(), "*"); 2382 D.setInvalidType(true); 2383 } 2384 2385 // cv-qualifiers on return types are pointless except when the type is a 2386 // class type in C++. 2387 if (isa<PointerType>(T) && T.getLocalCVRQualifiers() && 2388 (D.getName().getKind() != UnqualifiedId::IK_ConversionFunctionId) && 2389 (!LangOpts.CPlusPlus || !T->isDependentType())) { 2390 assert(chunkIndex + 1 < e && "No DeclaratorChunk for the return type?"); 2391 DeclaratorChunk ReturnTypeChunk = D.getTypeObject(chunkIndex + 1); 2392 assert(ReturnTypeChunk.Kind == DeclaratorChunk::Pointer); 2393 2394 DeclaratorChunk::PointerTypeInfo &PTI = ReturnTypeChunk.Ptr; 2395 2396 DiagnoseIgnoredQualifiers(PTI.TypeQuals, 2397 SourceLocation::getFromRawEncoding(PTI.ConstQualLoc), 2398 SourceLocation::getFromRawEncoding(PTI.VolatileQualLoc), 2399 SourceLocation::getFromRawEncoding(PTI.RestrictQualLoc), 2400 S); 2401 2402 } else if (T.getCVRQualifiers() && D.getDeclSpec().getTypeQualifiers() && 2403 (!LangOpts.CPlusPlus || 2404 (!T->isDependentType() && !T->isRecordType()))) { 2405 2406 DiagnoseIgnoredQualifiers(D.getDeclSpec().getTypeQualifiers(), 2407 D.getDeclSpec().getConstSpecLoc(), 2408 D.getDeclSpec().getVolatileSpecLoc(), 2409 D.getDeclSpec().getRestrictSpecLoc(), 2410 S); 2411 } 2412 2413 if (LangOpts.CPlusPlus && D.getDeclSpec().isTypeSpecOwned()) { 2414 // C++ [dcl.fct]p6: 2415 // Types shall not be defined in return or parameter types. 2416 TagDecl *Tag = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 2417 if (Tag->isCompleteDefinition()) 2418 S.Diag(Tag->getLocation(), diag::err_type_defined_in_result_type) 2419 << Context.getTypeDeclType(Tag); 2420 } 2421 2422 // Exception specs are not allowed in typedefs. Complain, but add it 2423 // anyway. 2424 if (IsTypedefName && FTI.getExceptionSpecType()) 2425 S.Diag(FTI.getExceptionSpecLoc(), diag::err_exception_spec_in_typedef) 2426 << (D.getContext() == Declarator::AliasDeclContext || 2427 D.getContext() == Declarator::AliasTemplateContext); 2428 2429 // If we see "T var();" or "T var(T());" at block scope, it is probably 2430 // an attempt to initialize a variable, not a function declaration. 2431 if (FTI.isAmbiguous) 2432 warnAboutAmbiguousFunction(S, D, DeclType, T); 2433 2434 if (!FTI.NumArgs && !FTI.isVariadic && !LangOpts.CPlusPlus) { 2435 // Simple void foo(), where the incoming T is the result type. 2436 T = Context.getFunctionNoProtoType(T); 2437 } else { 2438 // We allow a zero-parameter variadic function in C if the 2439 // function is marked with the "overloadable" attribute. Scan 2440 // for this attribute now. 2441 if (!FTI.NumArgs && FTI.isVariadic && !LangOpts.CPlusPlus) { 2442 bool Overloadable = false; 2443 for (const AttributeList *Attrs = D.getAttributes(); 2444 Attrs; Attrs = Attrs->getNext()) { 2445 if (Attrs->getKind() == AttributeList::AT_Overloadable) { 2446 Overloadable = true; 2447 break; 2448 } 2449 } 2450 2451 if (!Overloadable) 2452 S.Diag(FTI.getEllipsisLoc(), diag::err_ellipsis_first_arg); 2453 } 2454 2455 if (FTI.NumArgs && FTI.ArgInfo[0].Param == 0) { 2456 // C99 6.7.5.3p3: Reject int(x,y,z) when it's not a function 2457 // definition. 2458 S.Diag(FTI.ArgInfo[0].IdentLoc, diag::err_ident_list_in_fn_declaration); 2459 D.setInvalidType(true); 2460 break; 2461 } 2462 2463 FunctionProtoType::ExtProtoInfo EPI; 2464 EPI.Variadic = FTI.isVariadic; 2465 EPI.HasTrailingReturn = FTI.hasTrailingReturnType(); 2466 EPI.TypeQuals = FTI.TypeQuals; 2467 EPI.RefQualifier = !FTI.hasRefQualifier()? RQ_None 2468 : FTI.RefQualifierIsLValueRef? RQ_LValue 2469 : RQ_RValue; 2470 2471 // Otherwise, we have a function with an argument list that is 2472 // potentially variadic. 2473 SmallVector<QualType, 16> ArgTys; 2474 ArgTys.reserve(FTI.NumArgs); 2475 2476 SmallVector<bool, 16> ConsumedArguments; 2477 ConsumedArguments.reserve(FTI.NumArgs); 2478 bool HasAnyConsumedArguments = false; 2479 2480 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 2481 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 2482 QualType ArgTy = Param->getType(); 2483 assert(!ArgTy.isNull() && "Couldn't parse type?"); 2484 2485 // Adjust the parameter type. 2486 assert((ArgTy == Context.getAdjustedParameterType(ArgTy)) && 2487 "Unadjusted type?"); 2488 2489 // Look for 'void'. void is allowed only as a single argument to a 2490 // function with no other parameters (C99 6.7.5.3p10). We record 2491 // int(void) as a FunctionProtoType with an empty argument list. 2492 if (ArgTy->isVoidType()) { 2493 // If this is something like 'float(int, void)', reject it. 'void' 2494 // is an incomplete type (C99 6.2.5p19) and function decls cannot 2495 // have arguments of incomplete type. 2496 if (FTI.NumArgs != 1 || FTI.isVariadic) { 2497 S.Diag(DeclType.Loc, diag::err_void_only_param); 2498 ArgTy = Context.IntTy; 2499 Param->setType(ArgTy); 2500 } else if (FTI.ArgInfo[i].Ident) { 2501 // Reject, but continue to parse 'int(void abc)'. 2502 S.Diag(FTI.ArgInfo[i].IdentLoc, 2503 diag::err_param_with_void_type); 2504 ArgTy = Context.IntTy; 2505 Param->setType(ArgTy); 2506 } else { 2507 // Reject, but continue to parse 'float(const void)'. 2508 if (ArgTy.hasQualifiers()) 2509 S.Diag(DeclType.Loc, diag::err_void_param_qualified); 2510 2511 // Do not add 'void' to the ArgTys list. 2512 break; 2513 } 2514 } else if (ArgTy->isHalfType()) { 2515 // Disallow half FP arguments. 2516 // FIXME: This really should be in BuildFunctionType. 2517 S.Diag(Param->getLocation(), 2518 diag::err_parameters_retval_cannot_have_fp16_type) << 0 2519 << FixItHint::CreateInsertion(Param->getLocation(), "*"); 2520 D.setInvalidType(); 2521 } else if (!FTI.hasPrototype) { 2522 if (ArgTy->isPromotableIntegerType()) { 2523 ArgTy = Context.getPromotedIntegerType(ArgTy); 2524 Param->setKNRPromoted(true); 2525 } else if (const BuiltinType* BTy = ArgTy->getAs<BuiltinType>()) { 2526 if (BTy->getKind() == BuiltinType::Float) { 2527 ArgTy = Context.DoubleTy; 2528 Param->setKNRPromoted(true); 2529 } 2530 } 2531 } 2532 2533 if (LangOpts.ObjCAutoRefCount) { 2534 bool Consumed = Param->hasAttr<NSConsumedAttr>(); 2535 ConsumedArguments.push_back(Consumed); 2536 HasAnyConsumedArguments |= Consumed; 2537 } 2538 2539 ArgTys.push_back(ArgTy); 2540 } 2541 2542 if (HasAnyConsumedArguments) 2543 EPI.ConsumedArguments = ConsumedArguments.data(); 2544 2545 SmallVector<QualType, 4> Exceptions; 2546 SmallVector<ParsedType, 2> DynamicExceptions; 2547 SmallVector<SourceRange, 2> DynamicExceptionRanges; 2548 Expr *NoexceptExpr = 0; 2549 2550 if (FTI.getExceptionSpecType() == EST_Dynamic) { 2551 // FIXME: It's rather inefficient to have to split into two vectors 2552 // here. 2553 unsigned N = FTI.NumExceptions; 2554 DynamicExceptions.reserve(N); 2555 DynamicExceptionRanges.reserve(N); 2556 for (unsigned I = 0; I != N; ++I) { 2557 DynamicExceptions.push_back(FTI.Exceptions[I].Ty); 2558 DynamicExceptionRanges.push_back(FTI.Exceptions[I].Range); 2559 } 2560 } else if (FTI.getExceptionSpecType() == EST_ComputedNoexcept) { 2561 NoexceptExpr = FTI.NoexceptExpr; 2562 } 2563 2564 S.checkExceptionSpecification(FTI.getExceptionSpecType(), 2565 DynamicExceptions, 2566 DynamicExceptionRanges, 2567 NoexceptExpr, 2568 Exceptions, 2569 EPI); 2570 2571 T = Context.getFunctionType(T, ArgTys.data(), ArgTys.size(), EPI); 2572 } 2573 2574 break; 2575 } 2576 case DeclaratorChunk::MemberPointer: 2577 // The scope spec must refer to a class, or be dependent. 2578 CXXScopeSpec &SS = DeclType.Mem.Scope(); 2579 QualType ClsType; 2580 if (SS.isInvalid()) { 2581 // Avoid emitting extra errors if we already errored on the scope. 2582 D.setInvalidType(true); 2583 } else if (S.isDependentScopeSpecifier(SS) || 2584 dyn_cast_or_null<CXXRecordDecl>(S.computeDeclContext(SS))) { 2585 NestedNameSpecifier *NNS 2586 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 2587 NestedNameSpecifier *NNSPrefix = NNS->getPrefix(); 2588 switch (NNS->getKind()) { 2589 case NestedNameSpecifier::Identifier: 2590 ClsType = Context.getDependentNameType(ETK_None, NNSPrefix, 2591 NNS->getAsIdentifier()); 2592 break; 2593 2594 case NestedNameSpecifier::Namespace: 2595 case NestedNameSpecifier::NamespaceAlias: 2596 case NestedNameSpecifier::Global: 2597 llvm_unreachable("Nested-name-specifier must name a type"); 2598 2599 case NestedNameSpecifier::TypeSpec: 2600 case NestedNameSpecifier::TypeSpecWithTemplate: 2601 ClsType = QualType(NNS->getAsType(), 0); 2602 // Note: if the NNS has a prefix and ClsType is a nondependent 2603 // TemplateSpecializationType, then the NNS prefix is NOT included 2604 // in ClsType; hence we wrap ClsType into an ElaboratedType. 2605 // NOTE: in particular, no wrap occurs if ClsType already is an 2606 // Elaborated, DependentName, or DependentTemplateSpecialization. 2607 if (NNSPrefix && isa<TemplateSpecializationType>(NNS->getAsType())) 2608 ClsType = Context.getElaboratedType(ETK_None, NNSPrefix, ClsType); 2609 break; 2610 } 2611 } else { 2612 S.Diag(DeclType.Mem.Scope().getBeginLoc(), 2613 diag::err_illegal_decl_mempointer_in_nonclass) 2614 << (D.getIdentifier() ? D.getIdentifier()->getName() : "type name") 2615 << DeclType.Mem.Scope().getRange(); 2616 D.setInvalidType(true); 2617 } 2618 2619 if (!ClsType.isNull()) 2620 T = S.BuildMemberPointerType(T, ClsType, DeclType.Loc, D.getIdentifier()); 2621 if (T.isNull()) { 2622 T = Context.IntTy; 2623 D.setInvalidType(true); 2624 } else if (DeclType.Mem.TypeQuals) { 2625 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Mem.TypeQuals); 2626 } 2627 break; 2628 } 2629 2630 if (T.isNull()) { 2631 D.setInvalidType(true); 2632 T = Context.IntTy; 2633 } 2634 2635 // See if there are any attributes on this declarator chunk. 2636 if (AttributeList *attrs = const_cast<AttributeList*>(DeclType.getAttrs())) 2637 processTypeAttrs(state, T, false, attrs); 2638 } 2639 2640 if (LangOpts.CPlusPlus && T->isFunctionType()) { 2641 const FunctionProtoType *FnTy = T->getAs<FunctionProtoType>(); 2642 assert(FnTy && "Why oh why is there not a FunctionProtoType here?"); 2643 2644 // C++ 8.3.5p4: 2645 // A cv-qualifier-seq shall only be part of the function type 2646 // for a nonstatic member function, the function type to which a pointer 2647 // to member refers, or the top-level function type of a function typedef 2648 // declaration. 2649 // 2650 // Core issue 547 also allows cv-qualifiers on function types that are 2651 // top-level template type arguments. 2652 bool FreeFunction; 2653 if (!D.getCXXScopeSpec().isSet()) { 2654 FreeFunction = ((D.getContext() != Declarator::MemberContext && 2655 D.getContext() != Declarator::LambdaExprContext) || 2656 D.getDeclSpec().isFriendSpecified()); 2657 } else { 2658 DeclContext *DC = S.computeDeclContext(D.getCXXScopeSpec()); 2659 FreeFunction = (DC && !DC->isRecord()); 2660 } 2661 2662 // C++0x [dcl.constexpr]p8: A constexpr specifier for a non-static member 2663 // function that is not a constructor declares that function to be const. 2664 // FIXME: This should be deferred until we know whether this is a static 2665 // member function (for an out-of-class definition, we don't know 2666 // this until we perform redeclaration lookup). 2667 if (D.getDeclSpec().isConstexprSpecified() && !FreeFunction && 2668 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static && 2669 D.getName().getKind() != UnqualifiedId::IK_ConstructorName && 2670 D.getName().getKind() != UnqualifiedId::IK_ConstructorTemplateId && 2671 !(FnTy->getTypeQuals() & DeclSpec::TQ_const)) { 2672 // Rebuild function type adding a 'const' qualifier. 2673 FunctionProtoType::ExtProtoInfo EPI = FnTy->getExtProtoInfo(); 2674 EPI.TypeQuals |= DeclSpec::TQ_const; 2675 T = Context.getFunctionType(FnTy->getResultType(), 2676 FnTy->arg_type_begin(), 2677 FnTy->getNumArgs(), EPI); 2678 // Rebuild any parens around the identifier in the function type. 2679 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 2680 if (D.getTypeObject(i).Kind != DeclaratorChunk::Paren) 2681 break; 2682 T = S.BuildParenType(T); 2683 } 2684 } 2685 2686 // C++11 [dcl.fct]p6 (w/DR1417): 2687 // An attempt to specify a function type with a cv-qualifier-seq or a 2688 // ref-qualifier (including by typedef-name) is ill-formed unless it is: 2689 // - the function type for a non-static member function, 2690 // - the function type to which a pointer to member refers, 2691 // - the top-level function type of a function typedef declaration or 2692 // alias-declaration, 2693 // - the type-id in the default argument of a type-parameter, or 2694 // - the type-id of a template-argument for a type-parameter 2695 if (IsQualifiedFunction && 2696 !(!FreeFunction && 2697 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) && 2698 !IsTypedefName && 2699 D.getContext() != Declarator::TemplateTypeArgContext) { 2700 SourceLocation Loc = D.getLocStart(); 2701 SourceRange RemovalRange; 2702 unsigned I; 2703 if (D.isFunctionDeclarator(I)) { 2704 SmallVector<SourceLocation, 4> RemovalLocs; 2705 const DeclaratorChunk &Chunk = D.getTypeObject(I); 2706 assert(Chunk.Kind == DeclaratorChunk::Function); 2707 if (Chunk.Fun.hasRefQualifier()) 2708 RemovalLocs.push_back(Chunk.Fun.getRefQualifierLoc()); 2709 if (Chunk.Fun.TypeQuals & Qualifiers::Const) 2710 RemovalLocs.push_back(Chunk.Fun.getConstQualifierLoc()); 2711 if (Chunk.Fun.TypeQuals & Qualifiers::Volatile) 2712 RemovalLocs.push_back(Chunk.Fun.getVolatileQualifierLoc()); 2713 // FIXME: We do not track the location of the __restrict qualifier. 2714 //if (Chunk.Fun.TypeQuals & Qualifiers::Restrict) 2715 // RemovalLocs.push_back(Chunk.Fun.getRestrictQualifierLoc()); 2716 if (!RemovalLocs.empty()) { 2717 std::sort(RemovalLocs.begin(), RemovalLocs.end(), 2718 BeforeThanCompare<SourceLocation>(S.getSourceManager())); 2719 RemovalRange = SourceRange(RemovalLocs.front(), RemovalLocs.back()); 2720 Loc = RemovalLocs.front(); 2721 } 2722 } 2723 2724 S.Diag(Loc, diag::err_invalid_qualified_function_type) 2725 << FreeFunction << D.isFunctionDeclarator() << T 2726 << getFunctionQualifiersAsString(FnTy) 2727 << FixItHint::CreateRemoval(RemovalRange); 2728 2729 // Strip the cv-qualifiers and ref-qualifiers from the type. 2730 FunctionProtoType::ExtProtoInfo EPI = FnTy->getExtProtoInfo(); 2731 EPI.TypeQuals = 0; 2732 EPI.RefQualifier = RQ_None; 2733 2734 T = Context.getFunctionType(FnTy->getResultType(), 2735 FnTy->arg_type_begin(), 2736 FnTy->getNumArgs(), EPI); 2737 // Rebuild any parens around the identifier in the function type. 2738 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 2739 if (D.getTypeObject(i).Kind != DeclaratorChunk::Paren) 2740 break; 2741 T = S.BuildParenType(T); 2742 } 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 case AttributedType::attr_pnaclcall: 3008 return AttributeList::AT_PnaclCall; 3009 } 3010 llvm_unreachable("unexpected attribute kind!"); 3011} 3012 3013static void fillAttributedTypeLoc(AttributedTypeLoc TL, 3014 const AttributeList *attrs) { 3015 AttributedType::Kind kind = TL.getAttrKind(); 3016 3017 assert(attrs && "no type attributes in the expected location!"); 3018 AttributeList::Kind parsedKind = getAttrListKind(kind); 3019 while (attrs->getKind() != parsedKind) { 3020 attrs = attrs->getNext(); 3021 assert(attrs && "no matching attribute in expected location!"); 3022 } 3023 3024 TL.setAttrNameLoc(attrs->getLoc()); 3025 if (TL.hasAttrExprOperand()) 3026 TL.setAttrExprOperand(attrs->getArg(0)); 3027 else if (TL.hasAttrEnumOperand()) 3028 TL.setAttrEnumOperandLoc(attrs->getParameterLoc()); 3029 3030 // FIXME: preserve this information to here. 3031 if (TL.hasAttrOperand()) 3032 TL.setAttrOperandParensRange(SourceRange()); 3033} 3034 3035namespace { 3036 class TypeSpecLocFiller : public TypeLocVisitor<TypeSpecLocFiller> { 3037 ASTContext &Context; 3038 const DeclSpec &DS; 3039 3040 public: 3041 TypeSpecLocFiller(ASTContext &Context, const DeclSpec &DS) 3042 : Context(Context), DS(DS) {} 3043 3044 void VisitAttributedTypeLoc(AttributedTypeLoc TL) { 3045 fillAttributedTypeLoc(TL, DS.getAttributes().getList()); 3046 Visit(TL.getModifiedLoc()); 3047 } 3048 void VisitQualifiedTypeLoc(QualifiedTypeLoc TL) { 3049 Visit(TL.getUnqualifiedLoc()); 3050 } 3051 void VisitTypedefTypeLoc(TypedefTypeLoc TL) { 3052 TL.setNameLoc(DS.getTypeSpecTypeLoc()); 3053 } 3054 void VisitObjCInterfaceTypeLoc(ObjCInterfaceTypeLoc TL) { 3055 TL.setNameLoc(DS.getTypeSpecTypeLoc()); 3056 // FIXME. We should have DS.getTypeSpecTypeEndLoc(). But, it requires 3057 // addition field. What we have is good enough for dispay of location 3058 // of 'fixit' on interface name. 3059 TL.setNameEndLoc(DS.getLocEnd()); 3060 } 3061 void VisitObjCObjectTypeLoc(ObjCObjectTypeLoc TL) { 3062 // Handle the base type, which might not have been written explicitly. 3063 if (DS.getTypeSpecType() == DeclSpec::TST_unspecified) { 3064 TL.setHasBaseTypeAsWritten(false); 3065 TL.getBaseLoc().initialize(Context, SourceLocation()); 3066 } else { 3067 TL.setHasBaseTypeAsWritten(true); 3068 Visit(TL.getBaseLoc()); 3069 } 3070 3071 // Protocol qualifiers. 3072 if (DS.getProtocolQualifiers()) { 3073 assert(TL.getNumProtocols() > 0); 3074 assert(TL.getNumProtocols() == DS.getNumProtocolQualifiers()); 3075 TL.setLAngleLoc(DS.getProtocolLAngleLoc()); 3076 TL.setRAngleLoc(DS.getSourceRange().getEnd()); 3077 for (unsigned i = 0, e = DS.getNumProtocolQualifiers(); i != e; ++i) 3078 TL.setProtocolLoc(i, DS.getProtocolLocs()[i]); 3079 } else { 3080 assert(TL.getNumProtocols() == 0); 3081 TL.setLAngleLoc(SourceLocation()); 3082 TL.setRAngleLoc(SourceLocation()); 3083 } 3084 } 3085 void VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL) { 3086 TL.setStarLoc(SourceLocation()); 3087 Visit(TL.getPointeeLoc()); 3088 } 3089 void VisitTemplateSpecializationTypeLoc(TemplateSpecializationTypeLoc TL) { 3090 TypeSourceInfo *TInfo = 0; 3091 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 3092 3093 // If we got no declarator info from previous Sema routines, 3094 // just fill with the typespec loc. 3095 if (!TInfo) { 3096 TL.initialize(Context, DS.getTypeSpecTypeNameLoc()); 3097 return; 3098 } 3099 3100 TypeLoc OldTL = TInfo->getTypeLoc(); 3101 if (TInfo->getType()->getAs<ElaboratedType>()) { 3102 ElaboratedTypeLoc ElabTL = cast<ElaboratedTypeLoc>(OldTL); 3103 TemplateSpecializationTypeLoc NamedTL = 3104 cast<TemplateSpecializationTypeLoc>(ElabTL.getNamedTypeLoc()); 3105 TL.copy(NamedTL); 3106 } 3107 else 3108 TL.copy(cast<TemplateSpecializationTypeLoc>(OldTL)); 3109 } 3110 void VisitTypeOfExprTypeLoc(TypeOfExprTypeLoc TL) { 3111 assert(DS.getTypeSpecType() == DeclSpec::TST_typeofExpr); 3112 TL.setTypeofLoc(DS.getTypeSpecTypeLoc()); 3113 TL.setParensRange(DS.getTypeofParensRange()); 3114 } 3115 void VisitTypeOfTypeLoc(TypeOfTypeLoc TL) { 3116 assert(DS.getTypeSpecType() == DeclSpec::TST_typeofType); 3117 TL.setTypeofLoc(DS.getTypeSpecTypeLoc()); 3118 TL.setParensRange(DS.getTypeofParensRange()); 3119 assert(DS.getRepAsType()); 3120 TypeSourceInfo *TInfo = 0; 3121 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 3122 TL.setUnderlyingTInfo(TInfo); 3123 } 3124 void VisitUnaryTransformTypeLoc(UnaryTransformTypeLoc TL) { 3125 // FIXME: This holds only because we only have one unary transform. 3126 assert(DS.getTypeSpecType() == DeclSpec::TST_underlyingType); 3127 TL.setKWLoc(DS.getTypeSpecTypeLoc()); 3128 TL.setParensRange(DS.getTypeofParensRange()); 3129 assert(DS.getRepAsType()); 3130 TypeSourceInfo *TInfo = 0; 3131 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 3132 TL.setUnderlyingTInfo(TInfo); 3133 } 3134 void VisitBuiltinTypeLoc(BuiltinTypeLoc TL) { 3135 // By default, use the source location of the type specifier. 3136 TL.setBuiltinLoc(DS.getTypeSpecTypeLoc()); 3137 if (TL.needsExtraLocalData()) { 3138 // Set info for the written builtin specifiers. 3139 TL.getWrittenBuiltinSpecs() = DS.getWrittenBuiltinSpecs(); 3140 // Try to have a meaningful source location. 3141 if (TL.getWrittenSignSpec() != TSS_unspecified) 3142 // Sign spec loc overrides the others (e.g., 'unsigned long'). 3143 TL.setBuiltinLoc(DS.getTypeSpecSignLoc()); 3144 else if (TL.getWrittenWidthSpec() != TSW_unspecified) 3145 // Width spec loc overrides type spec loc (e.g., 'short int'). 3146 TL.setBuiltinLoc(DS.getTypeSpecWidthLoc()); 3147 } 3148 } 3149 void VisitElaboratedTypeLoc(ElaboratedTypeLoc TL) { 3150 ElaboratedTypeKeyword Keyword 3151 = TypeWithKeyword::getKeywordForTypeSpec(DS.getTypeSpecType()); 3152 if (DS.getTypeSpecType() == TST_typename) { 3153 TypeSourceInfo *TInfo = 0; 3154 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 3155 if (TInfo) { 3156 TL.copy(cast<ElaboratedTypeLoc>(TInfo->getTypeLoc())); 3157 return; 3158 } 3159 } 3160 TL.setElaboratedKeywordLoc(Keyword != ETK_None 3161 ? DS.getTypeSpecTypeLoc() 3162 : SourceLocation()); 3163 const CXXScopeSpec& SS = DS.getTypeSpecScope(); 3164 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 3165 Visit(TL.getNextTypeLoc().getUnqualifiedLoc()); 3166 } 3167 void VisitDependentNameTypeLoc(DependentNameTypeLoc TL) { 3168 assert(DS.getTypeSpecType() == TST_typename); 3169 TypeSourceInfo *TInfo = 0; 3170 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 3171 assert(TInfo); 3172 TL.copy(cast<DependentNameTypeLoc>(TInfo->getTypeLoc())); 3173 } 3174 void VisitDependentTemplateSpecializationTypeLoc( 3175 DependentTemplateSpecializationTypeLoc TL) { 3176 assert(DS.getTypeSpecType() == TST_typename); 3177 TypeSourceInfo *TInfo = 0; 3178 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 3179 assert(TInfo); 3180 TL.copy(cast<DependentTemplateSpecializationTypeLoc>( 3181 TInfo->getTypeLoc())); 3182 } 3183 void VisitTagTypeLoc(TagTypeLoc TL) { 3184 TL.setNameLoc(DS.getTypeSpecTypeNameLoc()); 3185 } 3186 void VisitAtomicTypeLoc(AtomicTypeLoc TL) { 3187 TL.setKWLoc(DS.getTypeSpecTypeLoc()); 3188 TL.setParensRange(DS.getTypeofParensRange()); 3189 3190 TypeSourceInfo *TInfo = 0; 3191 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 3192 TL.getValueLoc().initializeFullCopy(TInfo->getTypeLoc()); 3193 } 3194 3195 void VisitTypeLoc(TypeLoc TL) { 3196 // FIXME: add other typespec types and change this to an assert. 3197 TL.initialize(Context, DS.getTypeSpecTypeLoc()); 3198 } 3199 }; 3200 3201 class DeclaratorLocFiller : public TypeLocVisitor<DeclaratorLocFiller> { 3202 ASTContext &Context; 3203 const DeclaratorChunk &Chunk; 3204 3205 public: 3206 DeclaratorLocFiller(ASTContext &Context, const DeclaratorChunk &Chunk) 3207 : Context(Context), Chunk(Chunk) {} 3208 3209 void VisitQualifiedTypeLoc(QualifiedTypeLoc TL) { 3210 llvm_unreachable("qualified type locs not expected here!"); 3211 } 3212 3213 void VisitAttributedTypeLoc(AttributedTypeLoc TL) { 3214 fillAttributedTypeLoc(TL, Chunk.getAttrs()); 3215 } 3216 void VisitBlockPointerTypeLoc(BlockPointerTypeLoc TL) { 3217 assert(Chunk.Kind == DeclaratorChunk::BlockPointer); 3218 TL.setCaretLoc(Chunk.Loc); 3219 } 3220 void VisitPointerTypeLoc(PointerTypeLoc TL) { 3221 assert(Chunk.Kind == DeclaratorChunk::Pointer); 3222 TL.setStarLoc(Chunk.Loc); 3223 } 3224 void VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL) { 3225 assert(Chunk.Kind == DeclaratorChunk::Pointer); 3226 TL.setStarLoc(Chunk.Loc); 3227 } 3228 void VisitMemberPointerTypeLoc(MemberPointerTypeLoc TL) { 3229 assert(Chunk.Kind == DeclaratorChunk::MemberPointer); 3230 const CXXScopeSpec& SS = Chunk.Mem.Scope(); 3231 NestedNameSpecifierLoc NNSLoc = SS.getWithLocInContext(Context); 3232 3233 const Type* ClsTy = TL.getClass(); 3234 QualType ClsQT = QualType(ClsTy, 0); 3235 TypeSourceInfo *ClsTInfo = Context.CreateTypeSourceInfo(ClsQT, 0); 3236 // Now copy source location info into the type loc component. 3237 TypeLoc ClsTL = ClsTInfo->getTypeLoc(); 3238 switch (NNSLoc.getNestedNameSpecifier()->getKind()) { 3239 case NestedNameSpecifier::Identifier: 3240 assert(isa<DependentNameType>(ClsTy) && "Unexpected TypeLoc"); 3241 { 3242 DependentNameTypeLoc DNTLoc = cast<DependentNameTypeLoc>(ClsTL); 3243 DNTLoc.setElaboratedKeywordLoc(SourceLocation()); 3244 DNTLoc.setQualifierLoc(NNSLoc.getPrefix()); 3245 DNTLoc.setNameLoc(NNSLoc.getLocalBeginLoc()); 3246 } 3247 break; 3248 3249 case NestedNameSpecifier::TypeSpec: 3250 case NestedNameSpecifier::TypeSpecWithTemplate: 3251 if (isa<ElaboratedType>(ClsTy)) { 3252 ElaboratedTypeLoc ETLoc = *cast<ElaboratedTypeLoc>(&ClsTL); 3253 ETLoc.setElaboratedKeywordLoc(SourceLocation()); 3254 ETLoc.setQualifierLoc(NNSLoc.getPrefix()); 3255 TypeLoc NamedTL = ETLoc.getNamedTypeLoc(); 3256 NamedTL.initializeFullCopy(NNSLoc.getTypeLoc()); 3257 } else { 3258 ClsTL.initializeFullCopy(NNSLoc.getTypeLoc()); 3259 } 3260 break; 3261 3262 case NestedNameSpecifier::Namespace: 3263 case NestedNameSpecifier::NamespaceAlias: 3264 case NestedNameSpecifier::Global: 3265 llvm_unreachable("Nested-name-specifier must name a type"); 3266 } 3267 3268 // Finally fill in MemberPointerLocInfo fields. 3269 TL.setStarLoc(Chunk.Loc); 3270 TL.setClassTInfo(ClsTInfo); 3271 } 3272 void VisitLValueReferenceTypeLoc(LValueReferenceTypeLoc TL) { 3273 assert(Chunk.Kind == DeclaratorChunk::Reference); 3274 // 'Amp' is misleading: this might have been originally 3275 /// spelled with AmpAmp. 3276 TL.setAmpLoc(Chunk.Loc); 3277 } 3278 void VisitRValueReferenceTypeLoc(RValueReferenceTypeLoc TL) { 3279 assert(Chunk.Kind == DeclaratorChunk::Reference); 3280 assert(!Chunk.Ref.LValueRef); 3281 TL.setAmpAmpLoc(Chunk.Loc); 3282 } 3283 void VisitArrayTypeLoc(ArrayTypeLoc TL) { 3284 assert(Chunk.Kind == DeclaratorChunk::Array); 3285 TL.setLBracketLoc(Chunk.Loc); 3286 TL.setRBracketLoc(Chunk.EndLoc); 3287 TL.setSizeExpr(static_cast<Expr*>(Chunk.Arr.NumElts)); 3288 } 3289 void VisitFunctionTypeLoc(FunctionTypeLoc TL) { 3290 assert(Chunk.Kind == DeclaratorChunk::Function); 3291 TL.setLocalRangeBegin(Chunk.Loc); 3292 TL.setLocalRangeEnd(Chunk.EndLoc); 3293 3294 const DeclaratorChunk::FunctionTypeInfo &FTI = Chunk.Fun; 3295 TL.setLParenLoc(FTI.getLParenLoc()); 3296 TL.setRParenLoc(FTI.getRParenLoc()); 3297 for (unsigned i = 0, e = TL.getNumArgs(), tpi = 0; i != e; ++i) { 3298 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 3299 TL.setArg(tpi++, Param); 3300 } 3301 // FIXME: exception specs 3302 } 3303 void VisitParenTypeLoc(ParenTypeLoc TL) { 3304 assert(Chunk.Kind == DeclaratorChunk::Paren); 3305 TL.setLParenLoc(Chunk.Loc); 3306 TL.setRParenLoc(Chunk.EndLoc); 3307 } 3308 3309 void VisitTypeLoc(TypeLoc TL) { 3310 llvm_unreachable("unsupported TypeLoc kind in declarator!"); 3311 } 3312 }; 3313} 3314 3315/// \brief Create and instantiate a TypeSourceInfo with type source information. 3316/// 3317/// \param T QualType referring to the type as written in source code. 3318/// 3319/// \param ReturnTypeInfo For declarators whose return type does not show 3320/// up in the normal place in the declaration specifiers (such as a C++ 3321/// conversion function), this pointer will refer to a type source information 3322/// for that return type. 3323TypeSourceInfo * 3324Sema::GetTypeSourceInfoForDeclarator(Declarator &D, QualType T, 3325 TypeSourceInfo *ReturnTypeInfo) { 3326 TypeSourceInfo *TInfo = Context.CreateTypeSourceInfo(T); 3327 UnqualTypeLoc CurrTL = TInfo->getTypeLoc().getUnqualifiedLoc(); 3328 3329 // Handle parameter packs whose type is a pack expansion. 3330 if (isa<PackExpansionType>(T)) { 3331 cast<PackExpansionTypeLoc>(CurrTL).setEllipsisLoc(D.getEllipsisLoc()); 3332 CurrTL = CurrTL.getNextTypeLoc().getUnqualifiedLoc(); 3333 } 3334 3335 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 3336 while (isa<AttributedTypeLoc>(CurrTL)) { 3337 AttributedTypeLoc TL = cast<AttributedTypeLoc>(CurrTL); 3338 fillAttributedTypeLoc(TL, D.getTypeObject(i).getAttrs()); 3339 CurrTL = TL.getNextTypeLoc().getUnqualifiedLoc(); 3340 } 3341 3342 DeclaratorLocFiller(Context, D.getTypeObject(i)).Visit(CurrTL); 3343 CurrTL = CurrTL.getNextTypeLoc().getUnqualifiedLoc(); 3344 } 3345 3346 // If we have different source information for the return type, use 3347 // that. This really only applies to C++ conversion functions. 3348 if (ReturnTypeInfo) { 3349 TypeLoc TL = ReturnTypeInfo->getTypeLoc(); 3350 assert(TL.getFullDataSize() == CurrTL.getFullDataSize()); 3351 memcpy(CurrTL.getOpaqueData(), TL.getOpaqueData(), TL.getFullDataSize()); 3352 } else { 3353 TypeSpecLocFiller(Context, D.getDeclSpec()).Visit(CurrTL); 3354 } 3355 3356 return TInfo; 3357} 3358 3359/// \brief Create a LocInfoType to hold the given QualType and TypeSourceInfo. 3360ParsedType Sema::CreateParsedType(QualType T, TypeSourceInfo *TInfo) { 3361 // FIXME: LocInfoTypes are "transient", only needed for passing to/from Parser 3362 // and Sema during declaration parsing. Try deallocating/caching them when 3363 // it's appropriate, instead of allocating them and keeping them around. 3364 LocInfoType *LocT = (LocInfoType*)BumpAlloc.Allocate(sizeof(LocInfoType), 3365 TypeAlignment); 3366 new (LocT) LocInfoType(T, TInfo); 3367 assert(LocT->getTypeClass() != T->getTypeClass() && 3368 "LocInfoType's TypeClass conflicts with an existing Type class"); 3369 return ParsedType::make(QualType(LocT, 0)); 3370} 3371 3372void LocInfoType::getAsStringInternal(std::string &Str, 3373 const PrintingPolicy &Policy) const { 3374 llvm_unreachable("LocInfoType leaked into the type system; an opaque TypeTy*" 3375 " was used directly instead of getting the QualType through" 3376 " GetTypeFromParser"); 3377} 3378 3379TypeResult Sema::ActOnTypeName(Scope *S, Declarator &D) { 3380 // C99 6.7.6: Type names have no identifier. This is already validated by 3381 // the parser. 3382 assert(D.getIdentifier() == 0 && "Type name should have no identifier!"); 3383 3384 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 3385 QualType T = TInfo->getType(); 3386 if (D.isInvalidType()) 3387 return true; 3388 3389 // Make sure there are no unused decl attributes on the declarator. 3390 // We don't want to do this for ObjC parameters because we're going 3391 // to apply them to the actual parameter declaration. 3392 if (D.getContext() != Declarator::ObjCParameterContext) 3393 checkUnusedDeclAttributes(D); 3394 3395 if (getLangOpts().CPlusPlus) { 3396 // Check that there are no default arguments (C++ only). 3397 CheckExtraCXXDefaultArguments(D); 3398 } 3399 3400 return CreateParsedType(T, TInfo); 3401} 3402 3403ParsedType Sema::ActOnObjCInstanceType(SourceLocation Loc) { 3404 QualType T = Context.getObjCInstanceType(); 3405 TypeSourceInfo *TInfo = Context.getTrivialTypeSourceInfo(T, Loc); 3406 return CreateParsedType(T, TInfo); 3407} 3408 3409 3410//===----------------------------------------------------------------------===// 3411// Type Attribute Processing 3412//===----------------------------------------------------------------------===// 3413 3414/// HandleAddressSpaceTypeAttribute - Process an address_space attribute on the 3415/// specified type. The attribute contains 1 argument, the id of the address 3416/// space for the type. 3417static void HandleAddressSpaceTypeAttribute(QualType &Type, 3418 const AttributeList &Attr, Sema &S){ 3419 3420 // If this type is already address space qualified, reject it. 3421 // ISO/IEC TR 18037 S5.3 (amending C99 6.7.3): "No type shall be qualified by 3422 // qualifiers for two or more different address spaces." 3423 if (Type.getAddressSpace()) { 3424 S.Diag(Attr.getLoc(), diag::err_attribute_address_multiple_qualifiers); 3425 Attr.setInvalid(); 3426 return; 3427 } 3428 3429 // ISO/IEC TR 18037 S5.3 (amending C99 6.7.3): "A function type shall not be 3430 // qualified by an address-space qualifier." 3431 if (Type->isFunctionType()) { 3432 S.Diag(Attr.getLoc(), diag::err_attribute_address_function_type); 3433 Attr.setInvalid(); 3434 return; 3435 } 3436 3437 // Check the attribute arguments. 3438 if (Attr.getNumArgs() != 1) { 3439 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 3440 Attr.setInvalid(); 3441 return; 3442 } 3443 Expr *ASArgExpr = static_cast<Expr *>(Attr.getArg(0)); 3444 llvm::APSInt addrSpace(32); 3445 if (ASArgExpr->isTypeDependent() || ASArgExpr->isValueDependent() || 3446 !ASArgExpr->isIntegerConstantExpr(addrSpace, S.Context)) { 3447 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_not_int) 3448 << ASArgExpr->getSourceRange(); 3449 Attr.setInvalid(); 3450 return; 3451 } 3452 3453 // Bounds checking. 3454 if (addrSpace.isSigned()) { 3455 if (addrSpace.isNegative()) { 3456 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_negative) 3457 << ASArgExpr->getSourceRange(); 3458 Attr.setInvalid(); 3459 return; 3460 } 3461 addrSpace.setIsSigned(false); 3462 } 3463 llvm::APSInt max(addrSpace.getBitWidth()); 3464 max = Qualifiers::MaxAddressSpace; 3465 if (addrSpace > max) { 3466 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_too_high) 3467 << Qualifiers::MaxAddressSpace << ASArgExpr->getSourceRange(); 3468 Attr.setInvalid(); 3469 return; 3470 } 3471 3472 unsigned ASIdx = static_cast<unsigned>(addrSpace.getZExtValue()); 3473 Type = S.Context.getAddrSpaceQualType(Type, ASIdx); 3474} 3475 3476/// Does this type have a "direct" ownership qualifier? That is, 3477/// is it written like "__strong id", as opposed to something like 3478/// "typeof(foo)", where that happens to be strong? 3479static bool hasDirectOwnershipQualifier(QualType type) { 3480 // Fast path: no qualifier at all. 3481 assert(type.getQualifiers().hasObjCLifetime()); 3482 3483 while (true) { 3484 // __strong id 3485 if (const AttributedType *attr = dyn_cast<AttributedType>(type)) { 3486 if (attr->getAttrKind() == AttributedType::attr_objc_ownership) 3487 return true; 3488 3489 type = attr->getModifiedType(); 3490 3491 // X *__strong (...) 3492 } else if (const ParenType *paren = dyn_cast<ParenType>(type)) { 3493 type = paren->getInnerType(); 3494 3495 // That's it for things we want to complain about. In particular, 3496 // we do not want to look through typedefs, typeof(expr), 3497 // typeof(type), or any other way that the type is somehow 3498 // abstracted. 3499 } else { 3500 3501 return false; 3502 } 3503 } 3504} 3505 3506/// handleObjCOwnershipTypeAttr - Process an objc_ownership 3507/// attribute on the specified type. 3508/// 3509/// Returns 'true' if the attribute was handled. 3510static bool handleObjCOwnershipTypeAttr(TypeProcessingState &state, 3511 AttributeList &attr, 3512 QualType &type) { 3513 bool NonObjCPointer = false; 3514 3515 if (!type->isDependentType()) { 3516 if (const PointerType *ptr = type->getAs<PointerType>()) { 3517 QualType pointee = ptr->getPointeeType(); 3518 if (pointee->isObjCRetainableType() || pointee->isPointerType()) 3519 return false; 3520 // It is important not to lose the source info that there was an attribute 3521 // applied to non-objc pointer. We will create an attributed type but 3522 // its type will be the same as the original type. 3523 NonObjCPointer = true; 3524 } else if (!type->isObjCRetainableType()) { 3525 return false; 3526 } 3527 } 3528 3529 Sema &S = state.getSema(); 3530 SourceLocation AttrLoc = attr.getLoc(); 3531 if (AttrLoc.isMacroID()) 3532 AttrLoc = S.getSourceManager().getImmediateExpansionRange(AttrLoc).first; 3533 3534 if (!attr.getParameterName()) { 3535 S.Diag(AttrLoc, diag::err_attribute_argument_n_not_string) 3536 << "objc_ownership" << 1; 3537 attr.setInvalid(); 3538 return true; 3539 } 3540 3541 // Consume lifetime attributes without further comment outside of 3542 // ARC mode. 3543 if (!S.getLangOpts().ObjCAutoRefCount) 3544 return true; 3545 3546 Qualifiers::ObjCLifetime lifetime; 3547 if (attr.getParameterName()->isStr("none")) 3548 lifetime = Qualifiers::OCL_ExplicitNone; 3549 else if (attr.getParameterName()->isStr("strong")) 3550 lifetime = Qualifiers::OCL_Strong; 3551 else if (attr.getParameterName()->isStr("weak")) 3552 lifetime = Qualifiers::OCL_Weak; 3553 else if (attr.getParameterName()->isStr("autoreleasing")) 3554 lifetime = Qualifiers::OCL_Autoreleasing; 3555 else { 3556 S.Diag(AttrLoc, diag::warn_attribute_type_not_supported) 3557 << "objc_ownership" << attr.getParameterName(); 3558 attr.setInvalid(); 3559 return true; 3560 } 3561 3562 SplitQualType underlyingType = type.split(); 3563 3564 // Check for redundant/conflicting ownership qualifiers. 3565 if (Qualifiers::ObjCLifetime previousLifetime 3566 = type.getQualifiers().getObjCLifetime()) { 3567 // If it's written directly, that's an error. 3568 if (hasDirectOwnershipQualifier(type)) { 3569 S.Diag(AttrLoc, diag::err_attr_objc_ownership_redundant) 3570 << type; 3571 return true; 3572 } 3573 3574 // Otherwise, if the qualifiers actually conflict, pull sugar off 3575 // until we reach a type that is directly qualified. 3576 if (previousLifetime != lifetime) { 3577 // This should always terminate: the canonical type is 3578 // qualified, so some bit of sugar must be hiding it. 3579 while (!underlyingType.Quals.hasObjCLifetime()) { 3580 underlyingType = underlyingType.getSingleStepDesugaredType(); 3581 } 3582 underlyingType.Quals.removeObjCLifetime(); 3583 } 3584 } 3585 3586 underlyingType.Quals.addObjCLifetime(lifetime); 3587 3588 if (NonObjCPointer) { 3589 StringRef name = attr.getName()->getName(); 3590 switch (lifetime) { 3591 case Qualifiers::OCL_None: 3592 case Qualifiers::OCL_ExplicitNone: 3593 break; 3594 case Qualifiers::OCL_Strong: name = "__strong"; break; 3595 case Qualifiers::OCL_Weak: name = "__weak"; break; 3596 case Qualifiers::OCL_Autoreleasing: name = "__autoreleasing"; break; 3597 } 3598 S.Diag(AttrLoc, diag::warn_objc_object_attribute_wrong_type) 3599 << name << type; 3600 } 3601 3602 QualType origType = type; 3603 if (!NonObjCPointer) 3604 type = S.Context.getQualifiedType(underlyingType); 3605 3606 // If we have a valid source location for the attribute, use an 3607 // AttributedType instead. 3608 if (AttrLoc.isValid()) 3609 type = S.Context.getAttributedType(AttributedType::attr_objc_ownership, 3610 origType, type); 3611 3612 // Forbid __weak if the runtime doesn't support it. 3613 if (lifetime == Qualifiers::OCL_Weak && 3614 !S.getLangOpts().ObjCARCWeak && !NonObjCPointer) { 3615 3616 // Actually, delay this until we know what we're parsing. 3617 if (S.DelayedDiagnostics.shouldDelayDiagnostics()) { 3618 S.DelayedDiagnostics.add( 3619 sema::DelayedDiagnostic::makeForbiddenType( 3620 S.getSourceManager().getExpansionLoc(AttrLoc), 3621 diag::err_arc_weak_no_runtime, type, /*ignored*/ 0)); 3622 } else { 3623 S.Diag(AttrLoc, diag::err_arc_weak_no_runtime); 3624 } 3625 3626 attr.setInvalid(); 3627 return true; 3628 } 3629 3630 // Forbid __weak for class objects marked as 3631 // objc_arc_weak_reference_unavailable 3632 if (lifetime == Qualifiers::OCL_Weak) { 3633 QualType T = type; 3634 while (const PointerType *ptr = T->getAs<PointerType>()) 3635 T = ptr->getPointeeType(); 3636 if (const ObjCObjectPointerType *ObjT = T->getAs<ObjCObjectPointerType>()) { 3637 if (ObjCInterfaceDecl *Class = ObjT->getInterfaceDecl()) { 3638 if (Class->isArcWeakrefUnavailable()) { 3639 S.Diag(AttrLoc, diag::err_arc_unsupported_weak_class); 3640 S.Diag(ObjT->getInterfaceDecl()->getLocation(), 3641 diag::note_class_declared); 3642 } 3643 } 3644 } 3645 } 3646 3647 return true; 3648} 3649 3650/// handleObjCGCTypeAttr - Process the __attribute__((objc_gc)) type 3651/// attribute on the specified type. Returns true to indicate that 3652/// the attribute was handled, false to indicate that the type does 3653/// not permit the attribute. 3654static bool handleObjCGCTypeAttr(TypeProcessingState &state, 3655 AttributeList &attr, 3656 QualType &type) { 3657 Sema &S = state.getSema(); 3658 3659 // Delay if this isn't some kind of pointer. 3660 if (!type->isPointerType() && 3661 !type->isObjCObjectPointerType() && 3662 !type->isBlockPointerType()) 3663 return false; 3664 3665 if (type.getObjCGCAttr() != Qualifiers::GCNone) { 3666 S.Diag(attr.getLoc(), diag::err_attribute_multiple_objc_gc); 3667 attr.setInvalid(); 3668 return true; 3669 } 3670 3671 // Check the attribute arguments. 3672 if (!attr.getParameterName()) { 3673 S.Diag(attr.getLoc(), diag::err_attribute_argument_n_not_string) 3674 << "objc_gc" << 1; 3675 attr.setInvalid(); 3676 return true; 3677 } 3678 Qualifiers::GC GCAttr; 3679 if (attr.getNumArgs() != 0) { 3680 S.Diag(attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 3681 attr.setInvalid(); 3682 return true; 3683 } 3684 if (attr.getParameterName()->isStr("weak")) 3685 GCAttr = Qualifiers::Weak; 3686 else if (attr.getParameterName()->isStr("strong")) 3687 GCAttr = Qualifiers::Strong; 3688 else { 3689 S.Diag(attr.getLoc(), diag::warn_attribute_type_not_supported) 3690 << "objc_gc" << attr.getParameterName(); 3691 attr.setInvalid(); 3692 return true; 3693 } 3694 3695 QualType origType = type; 3696 type = S.Context.getObjCGCQualType(origType, GCAttr); 3697 3698 // Make an attributed type to preserve the source information. 3699 if (attr.getLoc().isValid()) 3700 type = S.Context.getAttributedType(AttributedType::attr_objc_gc, 3701 origType, type); 3702 3703 return true; 3704} 3705 3706namespace { 3707 /// A helper class to unwrap a type down to a function for the 3708 /// purposes of applying attributes there. 3709 /// 3710 /// Use: 3711 /// FunctionTypeUnwrapper unwrapped(SemaRef, T); 3712 /// if (unwrapped.isFunctionType()) { 3713 /// const FunctionType *fn = unwrapped.get(); 3714 /// // change fn somehow 3715 /// T = unwrapped.wrap(fn); 3716 /// } 3717 struct FunctionTypeUnwrapper { 3718 enum WrapKind { 3719 Desugar, 3720 Parens, 3721 Pointer, 3722 BlockPointer, 3723 Reference, 3724 MemberPointer 3725 }; 3726 3727 QualType Original; 3728 const FunctionType *Fn; 3729 SmallVector<unsigned char /*WrapKind*/, 8> Stack; 3730 3731 FunctionTypeUnwrapper(Sema &S, QualType T) : Original(T) { 3732 while (true) { 3733 const Type *Ty = T.getTypePtr(); 3734 if (isa<FunctionType>(Ty)) { 3735 Fn = cast<FunctionType>(Ty); 3736 return; 3737 } else if (isa<ParenType>(Ty)) { 3738 T = cast<ParenType>(Ty)->getInnerType(); 3739 Stack.push_back(Parens); 3740 } else if (isa<PointerType>(Ty)) { 3741 T = cast<PointerType>(Ty)->getPointeeType(); 3742 Stack.push_back(Pointer); 3743 } else if (isa<BlockPointerType>(Ty)) { 3744 T = cast<BlockPointerType>(Ty)->getPointeeType(); 3745 Stack.push_back(BlockPointer); 3746 } else if (isa<MemberPointerType>(Ty)) { 3747 T = cast<MemberPointerType>(Ty)->getPointeeType(); 3748 Stack.push_back(MemberPointer); 3749 } else if (isa<ReferenceType>(Ty)) { 3750 T = cast<ReferenceType>(Ty)->getPointeeType(); 3751 Stack.push_back(Reference); 3752 } else { 3753 const Type *DTy = Ty->getUnqualifiedDesugaredType(); 3754 if (Ty == DTy) { 3755 Fn = 0; 3756 return; 3757 } 3758 3759 T = QualType(DTy, 0); 3760 Stack.push_back(Desugar); 3761 } 3762 } 3763 } 3764 3765 bool isFunctionType() const { return (Fn != 0); } 3766 const FunctionType *get() const { return Fn; } 3767 3768 QualType wrap(Sema &S, const FunctionType *New) { 3769 // If T wasn't modified from the unwrapped type, do nothing. 3770 if (New == get()) return Original; 3771 3772 Fn = New; 3773 return wrap(S.Context, Original, 0); 3774 } 3775 3776 private: 3777 QualType wrap(ASTContext &C, QualType Old, unsigned I) { 3778 if (I == Stack.size()) 3779 return C.getQualifiedType(Fn, Old.getQualifiers()); 3780 3781 // Build up the inner type, applying the qualifiers from the old 3782 // type to the new type. 3783 SplitQualType SplitOld = Old.split(); 3784 3785 // As a special case, tail-recurse if there are no qualifiers. 3786 if (SplitOld.Quals.empty()) 3787 return wrap(C, SplitOld.Ty, I); 3788 return C.getQualifiedType(wrap(C, SplitOld.Ty, I), SplitOld.Quals); 3789 } 3790 3791 QualType wrap(ASTContext &C, const Type *Old, unsigned I) { 3792 if (I == Stack.size()) return QualType(Fn, 0); 3793 3794 switch (static_cast<WrapKind>(Stack[I++])) { 3795 case Desugar: 3796 // This is the point at which we potentially lose source 3797 // information. 3798 return wrap(C, Old->getUnqualifiedDesugaredType(), I); 3799 3800 case Parens: { 3801 QualType New = wrap(C, cast<ParenType>(Old)->getInnerType(), I); 3802 return C.getParenType(New); 3803 } 3804 3805 case Pointer: { 3806 QualType New = wrap(C, cast<PointerType>(Old)->getPointeeType(), I); 3807 return C.getPointerType(New); 3808 } 3809 3810 case BlockPointer: { 3811 QualType New = wrap(C, cast<BlockPointerType>(Old)->getPointeeType(),I); 3812 return C.getBlockPointerType(New); 3813 } 3814 3815 case MemberPointer: { 3816 const MemberPointerType *OldMPT = cast<MemberPointerType>(Old); 3817 QualType New = wrap(C, OldMPT->getPointeeType(), I); 3818 return C.getMemberPointerType(New, OldMPT->getClass()); 3819 } 3820 3821 case Reference: { 3822 const ReferenceType *OldRef = cast<ReferenceType>(Old); 3823 QualType New = wrap(C, OldRef->getPointeeType(), I); 3824 if (isa<LValueReferenceType>(OldRef)) 3825 return C.getLValueReferenceType(New, OldRef->isSpelledAsLValue()); 3826 else 3827 return C.getRValueReferenceType(New); 3828 } 3829 } 3830 3831 llvm_unreachable("unknown wrapping kind"); 3832 } 3833 }; 3834} 3835 3836/// Process an individual function attribute. Returns true to 3837/// indicate that the attribute was handled, false if it wasn't. 3838static bool handleFunctionTypeAttr(TypeProcessingState &state, 3839 AttributeList &attr, 3840 QualType &type) { 3841 Sema &S = state.getSema(); 3842 3843 FunctionTypeUnwrapper unwrapped(S, type); 3844 3845 if (attr.getKind() == AttributeList::AT_NoReturn) { 3846 if (S.CheckNoReturnAttr(attr)) 3847 return true; 3848 3849 // Delay if this is not a function type. 3850 if (!unwrapped.isFunctionType()) 3851 return false; 3852 3853 // Otherwise we can process right away. 3854 FunctionType::ExtInfo EI = unwrapped.get()->getExtInfo().withNoReturn(true); 3855 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 3856 return true; 3857 } 3858 3859 // ns_returns_retained is not always a type attribute, but if we got 3860 // here, we're treating it as one right now. 3861 if (attr.getKind() == AttributeList::AT_NSReturnsRetained) { 3862 assert(S.getLangOpts().ObjCAutoRefCount && 3863 "ns_returns_retained treated as type attribute in non-ARC"); 3864 if (attr.getNumArgs()) return true; 3865 3866 // Delay if this is not a function type. 3867 if (!unwrapped.isFunctionType()) 3868 return false; 3869 3870 FunctionType::ExtInfo EI 3871 = unwrapped.get()->getExtInfo().withProducesResult(true); 3872 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 3873 return true; 3874 } 3875 3876 if (attr.getKind() == AttributeList::AT_Regparm) { 3877 unsigned value; 3878 if (S.CheckRegparmAttr(attr, value)) 3879 return true; 3880 3881 // Delay if this is not a function type. 3882 if (!unwrapped.isFunctionType()) 3883 return false; 3884 3885 // Diagnose regparm with fastcall. 3886 const FunctionType *fn = unwrapped.get(); 3887 CallingConv CC = fn->getCallConv(); 3888 if (CC == CC_X86FastCall) { 3889 S.Diag(attr.getLoc(), diag::err_attributes_are_not_compatible) 3890 << FunctionType::getNameForCallConv(CC) 3891 << "regparm"; 3892 attr.setInvalid(); 3893 return true; 3894 } 3895 3896 FunctionType::ExtInfo EI = 3897 unwrapped.get()->getExtInfo().withRegParm(value); 3898 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 3899 return true; 3900 } 3901 3902 // Delay if the type didn't work out to a function. 3903 if (!unwrapped.isFunctionType()) return false; 3904 3905 // Otherwise, a calling convention. 3906 CallingConv CC; 3907 if (S.CheckCallingConvAttr(attr, CC)) 3908 return true; 3909 3910 const FunctionType *fn = unwrapped.get(); 3911 CallingConv CCOld = fn->getCallConv(); 3912 if (S.Context.getCanonicalCallConv(CC) == 3913 S.Context.getCanonicalCallConv(CCOld)) { 3914 FunctionType::ExtInfo EI= unwrapped.get()->getExtInfo().withCallingConv(CC); 3915 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 3916 return true; 3917 } 3918 3919 if (CCOld != (S.LangOpts.MRTD ? CC_X86StdCall : CC_Default)) { 3920 // Should we diagnose reapplications of the same convention? 3921 S.Diag(attr.getLoc(), diag::err_attributes_are_not_compatible) 3922 << FunctionType::getNameForCallConv(CC) 3923 << FunctionType::getNameForCallConv(CCOld); 3924 attr.setInvalid(); 3925 return true; 3926 } 3927 3928 // Diagnose the use of X86 fastcall on varargs or unprototyped functions. 3929 if (CC == CC_X86FastCall) { 3930 if (isa<FunctionNoProtoType>(fn)) { 3931 S.Diag(attr.getLoc(), diag::err_cconv_knr) 3932 << FunctionType::getNameForCallConv(CC); 3933 attr.setInvalid(); 3934 return true; 3935 } 3936 3937 const FunctionProtoType *FnP = cast<FunctionProtoType>(fn); 3938 if (FnP->isVariadic()) { 3939 S.Diag(attr.getLoc(), diag::err_cconv_varargs) 3940 << FunctionType::getNameForCallConv(CC); 3941 attr.setInvalid(); 3942 return true; 3943 } 3944 3945 // Also diagnose fastcall with regparm. 3946 if (fn->getHasRegParm()) { 3947 S.Diag(attr.getLoc(), diag::err_attributes_are_not_compatible) 3948 << "regparm" 3949 << FunctionType::getNameForCallConv(CC); 3950 attr.setInvalid(); 3951 return true; 3952 } 3953 } 3954 3955 FunctionType::ExtInfo EI = unwrapped.get()->getExtInfo().withCallingConv(CC); 3956 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 3957 return true; 3958} 3959 3960/// Handle OpenCL image access qualifiers: read_only, write_only, read_write 3961static void HandleOpenCLImageAccessAttribute(QualType& CurType, 3962 const AttributeList &Attr, 3963 Sema &S) { 3964 // Check the attribute arguments. 3965 if (Attr.getNumArgs() != 1) { 3966 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 3967 Attr.setInvalid(); 3968 return; 3969 } 3970 Expr *sizeExpr = static_cast<Expr *>(Attr.getArg(0)); 3971 llvm::APSInt arg(32); 3972 if (sizeExpr->isTypeDependent() || sizeExpr->isValueDependent() || 3973 !sizeExpr->isIntegerConstantExpr(arg, S.Context)) { 3974 S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int) 3975 << "opencl_image_access" << sizeExpr->getSourceRange(); 3976 Attr.setInvalid(); 3977 return; 3978 } 3979 unsigned iarg = static_cast<unsigned>(arg.getZExtValue()); 3980 switch (iarg) { 3981 case CLIA_read_only: 3982 case CLIA_write_only: 3983 case CLIA_read_write: 3984 // Implemented in a separate patch 3985 break; 3986 default: 3987 // Implemented in a separate patch 3988 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_size) 3989 << sizeExpr->getSourceRange(); 3990 Attr.setInvalid(); 3991 break; 3992 } 3993} 3994 3995/// HandleVectorSizeAttribute - this attribute is only applicable to integral 3996/// and float scalars, although arrays, pointers, and function return values are 3997/// allowed in conjunction with this construct. Aggregates with this attribute 3998/// are invalid, even if they are of the same size as a corresponding scalar. 3999/// The raw attribute should contain precisely 1 argument, the vector size for 4000/// the variable, measured in bytes. If curType and rawAttr are well formed, 4001/// this routine will return a new vector type. 4002static void HandleVectorSizeAttr(QualType& CurType, const AttributeList &Attr, 4003 Sema &S) { 4004 // Check the attribute arguments. 4005 if (Attr.getNumArgs() != 1) { 4006 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 4007 Attr.setInvalid(); 4008 return; 4009 } 4010 Expr *sizeExpr = static_cast<Expr *>(Attr.getArg(0)); 4011 llvm::APSInt vecSize(32); 4012 if (sizeExpr->isTypeDependent() || sizeExpr->isValueDependent() || 4013 !sizeExpr->isIntegerConstantExpr(vecSize, S.Context)) { 4014 S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int) 4015 << "vector_size" << sizeExpr->getSourceRange(); 4016 Attr.setInvalid(); 4017 return; 4018 } 4019 // the base type must be integer or float, and can't already be a vector. 4020 if (!CurType->isIntegerType() && !CurType->isRealFloatingType()) { 4021 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_vector_type) << CurType; 4022 Attr.setInvalid(); 4023 return; 4024 } 4025 unsigned typeSize = static_cast<unsigned>(S.Context.getTypeSize(CurType)); 4026 // vecSize is specified in bytes - convert to bits. 4027 unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue() * 8); 4028 4029 // the vector size needs to be an integral multiple of the type size. 4030 if (vectorSize % typeSize) { 4031 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_size) 4032 << sizeExpr->getSourceRange(); 4033 Attr.setInvalid(); 4034 return; 4035 } 4036 if (vectorSize == 0) { 4037 S.Diag(Attr.getLoc(), diag::err_attribute_zero_size) 4038 << sizeExpr->getSourceRange(); 4039 Attr.setInvalid(); 4040 return; 4041 } 4042 4043 // Success! Instantiate the vector type, the number of elements is > 0, and 4044 // not required to be a power of 2, unlike GCC. 4045 CurType = S.Context.getVectorType(CurType, vectorSize/typeSize, 4046 VectorType::GenericVector); 4047} 4048 4049/// \brief Process the OpenCL-like ext_vector_type attribute when it occurs on 4050/// a type. 4051static void HandleExtVectorTypeAttr(QualType &CurType, 4052 const AttributeList &Attr, 4053 Sema &S) { 4054 Expr *sizeExpr; 4055 4056 // Special case where the argument is a template id. 4057 if (Attr.getParameterName()) { 4058 CXXScopeSpec SS; 4059 SourceLocation TemplateKWLoc; 4060 UnqualifiedId id; 4061 id.setIdentifier(Attr.getParameterName(), Attr.getLoc()); 4062 4063 ExprResult Size = S.ActOnIdExpression(S.getCurScope(), SS, TemplateKWLoc, 4064 id, false, false); 4065 if (Size.isInvalid()) 4066 return; 4067 4068 sizeExpr = Size.get(); 4069 } else { 4070 // check the attribute arguments. 4071 if (Attr.getNumArgs() != 1) { 4072 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 4073 return; 4074 } 4075 sizeExpr = Attr.getArg(0); 4076 } 4077 4078 // Create the vector type. 4079 QualType T = S.BuildExtVectorType(CurType, sizeExpr, Attr.getLoc()); 4080 if (!T.isNull()) 4081 CurType = T; 4082} 4083 4084/// HandleNeonVectorTypeAttr - The "neon_vector_type" and 4085/// "neon_polyvector_type" attributes are used to create vector types that 4086/// are mangled according to ARM's ABI. Otherwise, these types are identical 4087/// to those created with the "vector_size" attribute. Unlike "vector_size" 4088/// the argument to these Neon attributes is the number of vector elements, 4089/// not the vector size in bytes. The vector width and element type must 4090/// match one of the standard Neon vector types. 4091static void HandleNeonVectorTypeAttr(QualType& CurType, 4092 const AttributeList &Attr, Sema &S, 4093 VectorType::VectorKind VecKind, 4094 const char *AttrName) { 4095 // Check the attribute arguments. 4096 if (Attr.getNumArgs() != 1) { 4097 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 4098 Attr.setInvalid(); 4099 return; 4100 } 4101 // The number of elements must be an ICE. 4102 Expr *numEltsExpr = static_cast<Expr *>(Attr.getArg(0)); 4103 llvm::APSInt numEltsInt(32); 4104 if (numEltsExpr->isTypeDependent() || numEltsExpr->isValueDependent() || 4105 !numEltsExpr->isIntegerConstantExpr(numEltsInt, S.Context)) { 4106 S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int) 4107 << AttrName << numEltsExpr->getSourceRange(); 4108 Attr.setInvalid(); 4109 return; 4110 } 4111 // Only certain element types are supported for Neon vectors. 4112 const BuiltinType* BTy = CurType->getAs<BuiltinType>(); 4113 if (!BTy || 4114 (VecKind == VectorType::NeonPolyVector && 4115 BTy->getKind() != BuiltinType::SChar && 4116 BTy->getKind() != BuiltinType::Short) || 4117 (BTy->getKind() != BuiltinType::SChar && 4118 BTy->getKind() != BuiltinType::UChar && 4119 BTy->getKind() != BuiltinType::Short && 4120 BTy->getKind() != BuiltinType::UShort && 4121 BTy->getKind() != BuiltinType::Int && 4122 BTy->getKind() != BuiltinType::UInt && 4123 BTy->getKind() != BuiltinType::LongLong && 4124 BTy->getKind() != BuiltinType::ULongLong && 4125 BTy->getKind() != BuiltinType::Float)) { 4126 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_vector_type) <<CurType; 4127 Attr.setInvalid(); 4128 return; 4129 } 4130 // The total size of the vector must be 64 or 128 bits. 4131 unsigned typeSize = static_cast<unsigned>(S.Context.getTypeSize(CurType)); 4132 unsigned numElts = static_cast<unsigned>(numEltsInt.getZExtValue()); 4133 unsigned vecSize = typeSize * numElts; 4134 if (vecSize != 64 && vecSize != 128) { 4135 S.Diag(Attr.getLoc(), diag::err_attribute_bad_neon_vector_size) << CurType; 4136 Attr.setInvalid(); 4137 return; 4138 } 4139 4140 CurType = S.Context.getVectorType(CurType, numElts, VecKind); 4141} 4142 4143static void processTypeAttrs(TypeProcessingState &state, QualType &type, 4144 bool isDeclSpec, AttributeList *attrs) { 4145 // Scan through and apply attributes to this type where it makes sense. Some 4146 // attributes (such as __address_space__, __vector_size__, etc) apply to the 4147 // type, but others can be present in the type specifiers even though they 4148 // apply to the decl. Here we apply type attributes and ignore the rest. 4149 4150 AttributeList *next; 4151 do { 4152 AttributeList &attr = *attrs; 4153 next = attr.getNext(); 4154 4155 // Skip attributes that were marked to be invalid. 4156 if (attr.isInvalid()) 4157 continue; 4158 4159 // If this is an attribute we can handle, do so now, 4160 // otherwise, add it to the FnAttrs list for rechaining. 4161 switch (attr.getKind()) { 4162 default: break; 4163 4164 case AttributeList::AT_MayAlias: 4165 // FIXME: This attribute needs to actually be handled, but if we ignore 4166 // it it breaks large amounts of Linux software. 4167 attr.setUsedAsTypeAttr(); 4168 break; 4169 case AttributeList::AT_AddressSpace: 4170 HandleAddressSpaceTypeAttribute(type, attr, state.getSema()); 4171 attr.setUsedAsTypeAttr(); 4172 break; 4173 OBJC_POINTER_TYPE_ATTRS_CASELIST: 4174 if (!handleObjCPointerTypeAttr(state, attr, type)) 4175 distributeObjCPointerTypeAttr(state, attr, type); 4176 attr.setUsedAsTypeAttr(); 4177 break; 4178 case AttributeList::AT_VectorSize: 4179 HandleVectorSizeAttr(type, attr, state.getSema()); 4180 attr.setUsedAsTypeAttr(); 4181 break; 4182 case AttributeList::AT_ExtVectorType: 4183 if (state.getDeclarator().getDeclSpec().getStorageClassSpec() 4184 != DeclSpec::SCS_typedef) 4185 HandleExtVectorTypeAttr(type, attr, state.getSema()); 4186 attr.setUsedAsTypeAttr(); 4187 break; 4188 case AttributeList::AT_NeonVectorType: 4189 HandleNeonVectorTypeAttr(type, attr, state.getSema(), 4190 VectorType::NeonVector, "neon_vector_type"); 4191 attr.setUsedAsTypeAttr(); 4192 break; 4193 case AttributeList::AT_NeonPolyVectorType: 4194 HandleNeonVectorTypeAttr(type, attr, state.getSema(), 4195 VectorType::NeonPolyVector, 4196 "neon_polyvector_type"); 4197 attr.setUsedAsTypeAttr(); 4198 break; 4199 case AttributeList::AT_OpenCLImageAccess: 4200 HandleOpenCLImageAccessAttribute(type, attr, state.getSema()); 4201 attr.setUsedAsTypeAttr(); 4202 break; 4203 4204 case AttributeList::AT_Win64: 4205 case AttributeList::AT_Ptr32: 4206 case AttributeList::AT_Ptr64: 4207 // FIXME: don't ignore these 4208 attr.setUsedAsTypeAttr(); 4209 break; 4210 4211 case AttributeList::AT_NSReturnsRetained: 4212 if (!state.getSema().getLangOpts().ObjCAutoRefCount) 4213 break; 4214 // fallthrough into the function attrs 4215 4216 FUNCTION_TYPE_ATTRS_CASELIST: 4217 attr.setUsedAsTypeAttr(); 4218 4219 // Never process function type attributes as part of the 4220 // declaration-specifiers. 4221 if (isDeclSpec) 4222 distributeFunctionTypeAttrFromDeclSpec(state, attr, type); 4223 4224 // Otherwise, handle the possible delays. 4225 else if (!handleFunctionTypeAttr(state, attr, type)) 4226 distributeFunctionTypeAttr(state, attr, type); 4227 break; 4228 } 4229 } while ((attrs = next)); 4230} 4231 4232/// \brief Ensure that the type of the given expression is complete. 4233/// 4234/// This routine checks whether the expression \p E has a complete type. If the 4235/// expression refers to an instantiable construct, that instantiation is 4236/// performed as needed to complete its type. Furthermore 4237/// Sema::RequireCompleteType is called for the expression's type (or in the 4238/// case of a reference type, the referred-to type). 4239/// 4240/// \param E The expression whose type is required to be complete. 4241/// \param Diagnoser The object that will emit a diagnostic if the type is 4242/// incomplete. 4243/// 4244/// \returns \c true if the type of \p E is incomplete and diagnosed, \c false 4245/// otherwise. 4246bool Sema::RequireCompleteExprType(Expr *E, TypeDiagnoser &Diagnoser){ 4247 QualType T = E->getType(); 4248 4249 // Fast path the case where the type is already complete. 4250 if (!T->isIncompleteType()) 4251 return false; 4252 4253 // Incomplete array types may be completed by the initializer attached to 4254 // their definitions. For static data members of class templates we need to 4255 // instantiate the definition to get this initializer and complete the type. 4256 if (T->isIncompleteArrayType()) { 4257 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E->IgnoreParens())) { 4258 if (VarDecl *Var = dyn_cast<VarDecl>(DRE->getDecl())) { 4259 if (Var->isStaticDataMember() && 4260 Var->getInstantiatedFromStaticDataMember()) { 4261 4262 MemberSpecializationInfo *MSInfo = Var->getMemberSpecializationInfo(); 4263 assert(MSInfo && "Missing member specialization information?"); 4264 if (MSInfo->getTemplateSpecializationKind() 4265 != TSK_ExplicitSpecialization) { 4266 // If we don't already have a point of instantiation, this is it. 4267 if (MSInfo->getPointOfInstantiation().isInvalid()) { 4268 MSInfo->setPointOfInstantiation(E->getLocStart()); 4269 4270 // This is a modification of an existing AST node. Notify 4271 // listeners. 4272 if (ASTMutationListener *L = getASTMutationListener()) 4273 L->StaticDataMemberInstantiated(Var); 4274 } 4275 4276 InstantiateStaticDataMemberDefinition(E->getExprLoc(), Var); 4277 4278 // Update the type to the newly instantiated definition's type both 4279 // here and within the expression. 4280 if (VarDecl *Def = Var->getDefinition()) { 4281 DRE->setDecl(Def); 4282 T = Def->getType(); 4283 DRE->setType(T); 4284 E->setType(T); 4285 } 4286 } 4287 4288 // We still go on to try to complete the type independently, as it 4289 // may also require instantiations or diagnostics if it remains 4290 // incomplete. 4291 } 4292 } 4293 } 4294 } 4295 4296 // FIXME: Are there other cases which require instantiating something other 4297 // than the type to complete the type of an expression? 4298 4299 // Look through reference types and complete the referred type. 4300 if (const ReferenceType *Ref = T->getAs<ReferenceType>()) 4301 T = Ref->getPointeeType(); 4302 4303 return RequireCompleteType(E->getExprLoc(), T, Diagnoser); 4304} 4305 4306namespace { 4307 struct TypeDiagnoserDiag : Sema::TypeDiagnoser { 4308 unsigned DiagID; 4309 4310 TypeDiagnoserDiag(unsigned DiagID) 4311 : Sema::TypeDiagnoser(DiagID == 0), DiagID(DiagID) {} 4312 4313 virtual void diagnose(Sema &S, SourceLocation Loc, QualType T) { 4314 if (Suppressed) return; 4315 S.Diag(Loc, DiagID) << T; 4316 } 4317 }; 4318} 4319 4320bool Sema::RequireCompleteExprType(Expr *E, unsigned DiagID) { 4321 TypeDiagnoserDiag Diagnoser(DiagID); 4322 return RequireCompleteExprType(E, Diagnoser); 4323} 4324 4325/// @brief Ensure that the type T is a complete type. 4326/// 4327/// This routine checks whether the type @p T is complete in any 4328/// context where a complete type is required. If @p T is a complete 4329/// type, returns false. If @p T is a class template specialization, 4330/// this routine then attempts to perform class template 4331/// instantiation. If instantiation fails, or if @p T is incomplete 4332/// and cannot be completed, issues the diagnostic @p diag (giving it 4333/// the type @p T) and returns true. 4334/// 4335/// @param Loc The location in the source that the incomplete type 4336/// diagnostic should refer to. 4337/// 4338/// @param T The type that this routine is examining for completeness. 4339/// 4340/// @returns @c true if @p T is incomplete and a diagnostic was emitted, 4341/// @c false otherwise. 4342bool Sema::RequireCompleteType(SourceLocation Loc, QualType T, 4343 TypeDiagnoser &Diagnoser) { 4344 // FIXME: Add this assertion to make sure we always get instantiation points. 4345 // assert(!Loc.isInvalid() && "Invalid location in RequireCompleteType"); 4346 // FIXME: Add this assertion to help us flush out problems with 4347 // checking for dependent types and type-dependent expressions. 4348 // 4349 // assert(!T->isDependentType() && 4350 // "Can't ask whether a dependent type is complete"); 4351 4352 // If we have a complete type, we're done. 4353 NamedDecl *Def = 0; 4354 if (!T->isIncompleteType(&Def)) { 4355 // If we know about the definition but it is not visible, complain. 4356 if (!Diagnoser.Suppressed && Def && !LookupResult::isVisible(Def)) { 4357 // Suppress this error outside of a SFINAE context if we've already 4358 // emitted the error once for this type. There's no usefulness in 4359 // repeating the diagnostic. 4360 // FIXME: Add a Fix-It that imports the corresponding module or includes 4361 // the header. 4362 if (isSFINAEContext() || HiddenDefinitions.insert(Def)) { 4363 Diag(Loc, diag::err_module_private_definition) << T; 4364 Diag(Def->getLocation(), diag::note_previous_definition); 4365 } 4366 } 4367 4368 return false; 4369 } 4370 4371 const TagType *Tag = T->getAs<TagType>(); 4372 const ObjCInterfaceType *IFace = 0; 4373 4374 if (Tag) { 4375 // Avoid diagnosing invalid decls as incomplete. 4376 if (Tag->getDecl()->isInvalidDecl()) 4377 return true; 4378 4379 // Give the external AST source a chance to complete the type. 4380 if (Tag->getDecl()->hasExternalLexicalStorage()) { 4381 Context.getExternalSource()->CompleteType(Tag->getDecl()); 4382 if (!Tag->isIncompleteType()) 4383 return false; 4384 } 4385 } 4386 else if ((IFace = T->getAs<ObjCInterfaceType>())) { 4387 // Avoid diagnosing invalid decls as incomplete. 4388 if (IFace->getDecl()->isInvalidDecl()) 4389 return true; 4390 4391 // Give the external AST source a chance to complete the type. 4392 if (IFace->getDecl()->hasExternalLexicalStorage()) { 4393 Context.getExternalSource()->CompleteType(IFace->getDecl()); 4394 if (!IFace->isIncompleteType()) 4395 return false; 4396 } 4397 } 4398 4399 // If we have a class template specialization or a class member of a 4400 // class template specialization, or an array with known size of such, 4401 // try to instantiate it. 4402 QualType MaybeTemplate = T; 4403 while (const ConstantArrayType *Array 4404 = Context.getAsConstantArrayType(MaybeTemplate)) 4405 MaybeTemplate = Array->getElementType(); 4406 if (const RecordType *Record = MaybeTemplate->getAs<RecordType>()) { 4407 if (ClassTemplateSpecializationDecl *ClassTemplateSpec 4408 = dyn_cast<ClassTemplateSpecializationDecl>(Record->getDecl())) { 4409 if (ClassTemplateSpec->getSpecializationKind() == TSK_Undeclared) 4410 return InstantiateClassTemplateSpecialization(Loc, ClassTemplateSpec, 4411 TSK_ImplicitInstantiation, 4412 /*Complain=*/!Diagnoser.Suppressed); 4413 } else if (CXXRecordDecl *Rec 4414 = dyn_cast<CXXRecordDecl>(Record->getDecl())) { 4415 CXXRecordDecl *Pattern = Rec->getInstantiatedFromMemberClass(); 4416 if (!Rec->isBeingDefined() && Pattern) { 4417 MemberSpecializationInfo *MSI = Rec->getMemberSpecializationInfo(); 4418 assert(MSI && "Missing member specialization information?"); 4419 // This record was instantiated from a class within a template. 4420 if (MSI->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 4421 return InstantiateClass(Loc, Rec, Pattern, 4422 getTemplateInstantiationArgs(Rec), 4423 TSK_ImplicitInstantiation, 4424 /*Complain=*/!Diagnoser.Suppressed); 4425 } 4426 } 4427 } 4428 4429 if (Diagnoser.Suppressed) 4430 return true; 4431 4432 // We have an incomplete type. Produce a diagnostic. 4433 Diagnoser.diagnose(*this, Loc, T); 4434 4435 // If the type was a forward declaration of a class/struct/union 4436 // type, produce a note. 4437 if (Tag && !Tag->getDecl()->isInvalidDecl()) 4438 Diag(Tag->getDecl()->getLocation(), 4439 Tag->isBeingDefined() ? diag::note_type_being_defined 4440 : diag::note_forward_declaration) 4441 << QualType(Tag, 0); 4442 4443 // If the Objective-C class was a forward declaration, produce a note. 4444 if (IFace && !IFace->getDecl()->isInvalidDecl()) 4445 Diag(IFace->getDecl()->getLocation(), diag::note_forward_class); 4446 4447 return true; 4448} 4449 4450bool Sema::RequireCompleteType(SourceLocation Loc, QualType T, 4451 unsigned DiagID) { 4452 TypeDiagnoserDiag Diagnoser(DiagID); 4453 return RequireCompleteType(Loc, T, Diagnoser); 4454} 4455 4456/// \brief Get diagnostic %select index for tag kind for 4457/// literal type diagnostic message. 4458/// WARNING: Indexes apply to particular diagnostics only! 4459/// 4460/// \returns diagnostic %select index. 4461static unsigned getLiteralDiagFromTagKind(TagTypeKind Tag) { 4462 switch (Tag) { 4463 case TTK_Struct: return 0; 4464 case TTK_Interface: return 1; 4465 case TTK_Class: return 2; 4466 default: llvm_unreachable("Invalid tag kind for literal type diagnostic!"); 4467 } 4468} 4469 4470/// @brief Ensure that the type T is a literal type. 4471/// 4472/// This routine checks whether the type @p T is a literal type. If @p T is an 4473/// incomplete type, an attempt is made to complete it. If @p T is a literal 4474/// type, or @p AllowIncompleteType is true and @p T is an incomplete type, 4475/// returns false. Otherwise, this routine issues the diagnostic @p PD (giving 4476/// it the type @p T), along with notes explaining why the type is not a 4477/// literal type, and returns true. 4478/// 4479/// @param Loc The location in the source that the non-literal type 4480/// diagnostic should refer to. 4481/// 4482/// @param T The type that this routine is examining for literalness. 4483/// 4484/// @param Diagnoser Emits a diagnostic if T is not a literal type. 4485/// 4486/// @returns @c true if @p T is not a literal type and a diagnostic was emitted, 4487/// @c false otherwise. 4488bool Sema::RequireLiteralType(SourceLocation Loc, QualType T, 4489 TypeDiagnoser &Diagnoser) { 4490 assert(!T->isDependentType() && "type should not be dependent"); 4491 4492 QualType ElemType = Context.getBaseElementType(T); 4493 RequireCompleteType(Loc, ElemType, 0); 4494 4495 if (T->isLiteralType()) 4496 return false; 4497 4498 if (Diagnoser.Suppressed) 4499 return true; 4500 4501 Diagnoser.diagnose(*this, Loc, T); 4502 4503 if (T->isVariableArrayType()) 4504 return true; 4505 4506 const RecordType *RT = ElemType->getAs<RecordType>(); 4507 if (!RT) 4508 return true; 4509 4510 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 4511 4512 // A partially-defined class type can't be a literal type, because a literal 4513 // class type must have a trivial destructor (which can't be checked until 4514 // the class definition is complete). 4515 if (!RD->isCompleteDefinition()) { 4516 RequireCompleteType(Loc, ElemType, diag::note_non_literal_incomplete, T); 4517 return true; 4518 } 4519 4520 // If the class has virtual base classes, then it's not an aggregate, and 4521 // cannot have any constexpr constructors or a trivial default constructor, 4522 // so is non-literal. This is better to diagnose than the resulting absence 4523 // of constexpr constructors. 4524 if (RD->getNumVBases()) { 4525 Diag(RD->getLocation(), diag::note_non_literal_virtual_base) 4526 << getLiteralDiagFromTagKind(RD->getTagKind()) << RD->getNumVBases(); 4527 for (CXXRecordDecl::base_class_const_iterator I = RD->vbases_begin(), 4528 E = RD->vbases_end(); I != E; ++I) 4529 Diag(I->getLocStart(), 4530 diag::note_constexpr_virtual_base_here) << I->getSourceRange(); 4531 } else if (!RD->isAggregate() && !RD->hasConstexprNonCopyMoveConstructor() && 4532 !RD->hasTrivialDefaultConstructor()) { 4533 Diag(RD->getLocation(), diag::note_non_literal_no_constexpr_ctors) << RD; 4534 } else if (RD->hasNonLiteralTypeFieldsOrBases()) { 4535 for (CXXRecordDecl::base_class_const_iterator I = RD->bases_begin(), 4536 E = RD->bases_end(); I != E; ++I) { 4537 if (!I->getType()->isLiteralType()) { 4538 Diag(I->getLocStart(), 4539 diag::note_non_literal_base_class) 4540 << RD << I->getType() << I->getSourceRange(); 4541 return true; 4542 } 4543 } 4544 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 4545 E = RD->field_end(); I != E; ++I) { 4546 if (!I->getType()->isLiteralType() || 4547 I->getType().isVolatileQualified()) { 4548 Diag(I->getLocation(), diag::note_non_literal_field) 4549 << RD << *I << I->getType() 4550 << I->getType().isVolatileQualified(); 4551 return true; 4552 } 4553 } 4554 } else if (!RD->hasTrivialDestructor()) { 4555 // All fields and bases are of literal types, so have trivial destructors. 4556 // If this class's destructor is non-trivial it must be user-declared. 4557 CXXDestructorDecl *Dtor = RD->getDestructor(); 4558 assert(Dtor && "class has literal fields and bases but no dtor?"); 4559 if (!Dtor) 4560 return true; 4561 4562 Diag(Dtor->getLocation(), Dtor->isUserProvided() ? 4563 diag::note_non_literal_user_provided_dtor : 4564 diag::note_non_literal_nontrivial_dtor) << RD; 4565 } 4566 4567 return true; 4568} 4569 4570bool Sema::RequireLiteralType(SourceLocation Loc, QualType T, unsigned DiagID) { 4571 TypeDiagnoserDiag Diagnoser(DiagID); 4572 return RequireLiteralType(Loc, T, Diagnoser); 4573} 4574 4575/// \brief Retrieve a version of the type 'T' that is elaborated by Keyword 4576/// and qualified by the nested-name-specifier contained in SS. 4577QualType Sema::getElaboratedType(ElaboratedTypeKeyword Keyword, 4578 const CXXScopeSpec &SS, QualType T) { 4579 if (T.isNull()) 4580 return T; 4581 NestedNameSpecifier *NNS; 4582 if (SS.isValid()) 4583 NNS = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 4584 else { 4585 if (Keyword == ETK_None) 4586 return T; 4587 NNS = 0; 4588 } 4589 return Context.getElaboratedType(Keyword, NNS, T); 4590} 4591 4592QualType Sema::BuildTypeofExprType(Expr *E, SourceLocation Loc) { 4593 ExprResult ER = CheckPlaceholderExpr(E); 4594 if (ER.isInvalid()) return QualType(); 4595 E = ER.take(); 4596 4597 if (!E->isTypeDependent()) { 4598 QualType T = E->getType(); 4599 if (const TagType *TT = T->getAs<TagType>()) 4600 DiagnoseUseOfDecl(TT->getDecl(), E->getExprLoc()); 4601 } 4602 return Context.getTypeOfExprType(E); 4603} 4604 4605/// getDecltypeForExpr - Given an expr, will return the decltype for 4606/// that expression, according to the rules in C++11 4607/// [dcl.type.simple]p4 and C++11 [expr.lambda.prim]p18. 4608static QualType getDecltypeForExpr(Sema &S, Expr *E) { 4609 if (E->isTypeDependent()) 4610 return S.Context.DependentTy; 4611 4612 // C++11 [dcl.type.simple]p4: 4613 // The type denoted by decltype(e) is defined as follows: 4614 // 4615 // - if e is an unparenthesized id-expression or an unparenthesized class 4616 // member access (5.2.5), decltype(e) is the type of the entity named 4617 // by e. If there is no such entity, or if e names a set of overloaded 4618 // functions, the program is ill-formed; 4619 // 4620 // We apply the same rules for Objective-C ivar and property references. 4621 if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E)) { 4622 if (const ValueDecl *VD = dyn_cast<ValueDecl>(DRE->getDecl())) 4623 return VD->getType(); 4624 } else if (const MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 4625 if (const FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl())) 4626 return FD->getType(); 4627 } else if (const ObjCIvarRefExpr *IR = dyn_cast<ObjCIvarRefExpr>(E)) { 4628 return IR->getDecl()->getType(); 4629 } else if (const ObjCPropertyRefExpr *PR = dyn_cast<ObjCPropertyRefExpr>(E)) { 4630 if (PR->isExplicitProperty()) 4631 return PR->getExplicitProperty()->getType(); 4632 } 4633 4634 // C++11 [expr.lambda.prim]p18: 4635 // Every occurrence of decltype((x)) where x is a possibly 4636 // parenthesized id-expression that names an entity of automatic 4637 // storage duration is treated as if x were transformed into an 4638 // access to a corresponding data member of the closure type that 4639 // would have been declared if x were an odr-use of the denoted 4640 // entity. 4641 using namespace sema; 4642 if (S.getCurLambda()) { 4643 if (isa<ParenExpr>(E)) { 4644 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E->IgnoreParens())) { 4645 if (VarDecl *Var = dyn_cast<VarDecl>(DRE->getDecl())) { 4646 QualType T = S.getCapturedDeclRefType(Var, DRE->getLocation()); 4647 if (!T.isNull()) 4648 return S.Context.getLValueReferenceType(T); 4649 } 4650 } 4651 } 4652 } 4653 4654 4655 // C++11 [dcl.type.simple]p4: 4656 // [...] 4657 QualType T = E->getType(); 4658 switch (E->getValueKind()) { 4659 // - otherwise, if e is an xvalue, decltype(e) is T&&, where T is the 4660 // type of e; 4661 case VK_XValue: T = S.Context.getRValueReferenceType(T); break; 4662 // - otherwise, if e is an lvalue, decltype(e) is T&, where T is the 4663 // type of e; 4664 case VK_LValue: T = S.Context.getLValueReferenceType(T); break; 4665 // - otherwise, decltype(e) is the type of e. 4666 case VK_RValue: break; 4667 } 4668 4669 return T; 4670} 4671 4672QualType Sema::BuildDecltypeType(Expr *E, SourceLocation Loc) { 4673 ExprResult ER = CheckPlaceholderExpr(E); 4674 if (ER.isInvalid()) return QualType(); 4675 E = ER.take(); 4676 4677 return Context.getDecltypeType(E, getDecltypeForExpr(*this, E)); 4678} 4679 4680QualType Sema::BuildUnaryTransformType(QualType BaseType, 4681 UnaryTransformType::UTTKind UKind, 4682 SourceLocation Loc) { 4683 switch (UKind) { 4684 case UnaryTransformType::EnumUnderlyingType: 4685 if (!BaseType->isDependentType() && !BaseType->isEnumeralType()) { 4686 Diag(Loc, diag::err_only_enums_have_underlying_types); 4687 return QualType(); 4688 } else { 4689 QualType Underlying = BaseType; 4690 if (!BaseType->isDependentType()) { 4691 EnumDecl *ED = BaseType->getAs<EnumType>()->getDecl(); 4692 assert(ED && "EnumType has no EnumDecl"); 4693 DiagnoseUseOfDecl(ED, Loc); 4694 Underlying = ED->getIntegerType(); 4695 } 4696 assert(!Underlying.isNull()); 4697 return Context.getUnaryTransformType(BaseType, Underlying, 4698 UnaryTransformType::EnumUnderlyingType); 4699 } 4700 } 4701 llvm_unreachable("unknown unary transform type"); 4702} 4703 4704QualType Sema::BuildAtomicType(QualType T, SourceLocation Loc) { 4705 if (!T->isDependentType()) { 4706 // FIXME: It isn't entirely clear whether incomplete atomic types 4707 // are allowed or not; for simplicity, ban them for the moment. 4708 if (RequireCompleteType(Loc, T, diag::err_atomic_specifier_bad_type, 0)) 4709 return QualType(); 4710 4711 int DisallowedKind = -1; 4712 if (T->isArrayType()) 4713 DisallowedKind = 1; 4714 else if (T->isFunctionType()) 4715 DisallowedKind = 2; 4716 else if (T->isReferenceType()) 4717 DisallowedKind = 3; 4718 else if (T->isAtomicType()) 4719 DisallowedKind = 4; 4720 else if (T.hasQualifiers()) 4721 DisallowedKind = 5; 4722 else if (!T.isTriviallyCopyableType(Context)) 4723 // Some other non-trivially-copyable type (probably a C++ class) 4724 DisallowedKind = 6; 4725 4726 if (DisallowedKind != -1) { 4727 Diag(Loc, diag::err_atomic_specifier_bad_type) << DisallowedKind << T; 4728 return QualType(); 4729 } 4730 4731 // FIXME: Do we need any handling for ARC here? 4732 } 4733 4734 // Build the pointer type. 4735 return Context.getAtomicType(T); 4736} 4737