SemaType.cpp revision 6b3d3e54c003b03f16e235ad2ff49e95587bbf92
1//===--- SemaType.cpp - Semantic Analysis for Types -----------------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements type-related semantic analysis. 11// 12//===----------------------------------------------------------------------===// 13 14#include "clang/Sema/SemaInternal.h" 15#include "clang/AST/ASTContext.h" 16#include "clang/AST/ASTMutationListener.h" 17#include "clang/AST/CXXInheritance.h" 18#include "clang/AST/DeclObjC.h" 19#include "clang/AST/DeclTemplate.h" 20#include "clang/AST/Expr.h" 21#include "clang/AST/TypeLoc.h" 22#include "clang/AST/TypeLocVisitor.h" 23#include "clang/Basic/OpenCL.h" 24#include "clang/Basic/PartialDiagnostic.h" 25#include "clang/Basic/TargetInfo.h" 26#include "clang/Lex/Preprocessor.h" 27#include "clang/Parse/ParseDiagnostic.h" 28#include "clang/Sema/DeclSpec.h" 29#include "clang/Sema/DelayedDiagnostic.h" 30#include "clang/Sema/Lookup.h" 31#include "clang/Sema/ScopeInfo.h" 32#include "clang/Sema/Template.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 case AttributeList::AT_IntelOclBicc \ 111 112namespace { 113 /// An object which stores processing state for the entire 114 /// GetTypeForDeclarator process. 115 class TypeProcessingState { 116 Sema &sema; 117 118 /// The declarator being processed. 119 Declarator &declarator; 120 121 /// The index of the declarator chunk we're currently processing. 122 /// May be the total number of valid chunks, indicating the 123 /// DeclSpec. 124 unsigned chunkIndex; 125 126 /// Whether there are non-trivial modifications to the decl spec. 127 bool trivial; 128 129 /// Whether we saved the attributes in the decl spec. 130 bool hasSavedAttrs; 131 132 /// The original set of attributes on the DeclSpec. 133 SmallVector<AttributeList*, 2> savedAttrs; 134 135 /// A list of attributes to diagnose the uselessness of when the 136 /// processing is complete. 137 SmallVector<AttributeList*, 2> ignoredTypeAttrs; 138 139 public: 140 TypeProcessingState(Sema &sema, Declarator &declarator) 141 : sema(sema), declarator(declarator), 142 chunkIndex(declarator.getNumTypeObjects()), 143 trivial(true), hasSavedAttrs(false) {} 144 145 Sema &getSema() const { 146 return sema; 147 } 148 149 Declarator &getDeclarator() const { 150 return declarator; 151 } 152 153 unsigned getCurrentChunkIndex() const { 154 return chunkIndex; 155 } 156 157 void setCurrentChunkIndex(unsigned idx) { 158 assert(idx <= declarator.getNumTypeObjects()); 159 chunkIndex = idx; 160 } 161 162 AttributeList *&getCurrentAttrListRef() const { 163 assert(chunkIndex <= declarator.getNumTypeObjects()); 164 if (chunkIndex == declarator.getNumTypeObjects()) 165 return getMutableDeclSpec().getAttributes().getListRef(); 166 return declarator.getTypeObject(chunkIndex).getAttrListRef(); 167 } 168 169 /// Save the current set of attributes on the DeclSpec. 170 void saveDeclSpecAttrs() { 171 // Don't try to save them multiple times. 172 if (hasSavedAttrs) return; 173 174 DeclSpec &spec = getMutableDeclSpec(); 175 for (AttributeList *attr = spec.getAttributes().getList(); attr; 176 attr = attr->getNext()) 177 savedAttrs.push_back(attr); 178 trivial &= savedAttrs.empty(); 179 hasSavedAttrs = true; 180 } 181 182 /// Record that we had nowhere to put the given type attribute. 183 /// We will diagnose such attributes later. 184 void addIgnoredTypeAttr(AttributeList &attr) { 185 ignoredTypeAttrs.push_back(&attr); 186 } 187 188 /// Diagnose all the ignored type attributes, given that the 189 /// declarator worked out to the given type. 190 void diagnoseIgnoredTypeAttrs(QualType type) const { 191 for (SmallVectorImpl<AttributeList*>::const_iterator 192 i = ignoredTypeAttrs.begin(), e = ignoredTypeAttrs.end(); 193 i != e; ++i) 194 diagnoseBadTypeAttribute(getSema(), **i, type); 195 } 196 197 ~TypeProcessingState() { 198 if (trivial) return; 199 200 restoreDeclSpecAttrs(); 201 } 202 203 private: 204 DeclSpec &getMutableDeclSpec() const { 205 return const_cast<DeclSpec&>(declarator.getDeclSpec()); 206 } 207 208 void restoreDeclSpecAttrs() { 209 assert(hasSavedAttrs); 210 211 if (savedAttrs.empty()) { 212 getMutableDeclSpec().getAttributes().set(0); 213 return; 214 } 215 216 getMutableDeclSpec().getAttributes().set(savedAttrs[0]); 217 for (unsigned i = 0, e = savedAttrs.size() - 1; i != e; ++i) 218 savedAttrs[i]->setNext(savedAttrs[i+1]); 219 savedAttrs.back()->setNext(0); 220 } 221 }; 222 223 /// Basically std::pair except that we really want to avoid an 224 /// implicit operator= for safety concerns. It's also a minor 225 /// link-time optimization for this to be a private type. 226 struct AttrAndList { 227 /// The attribute. 228 AttributeList &first; 229 230 /// The head of the list the attribute is currently in. 231 AttributeList *&second; 232 233 AttrAndList(AttributeList &attr, AttributeList *&head) 234 : first(attr), second(head) {} 235 }; 236} 237 238namespace llvm { 239 template <> struct isPodLike<AttrAndList> { 240 static const bool value = true; 241 }; 242} 243 244static void spliceAttrIntoList(AttributeList &attr, AttributeList *&head) { 245 attr.setNext(head); 246 head = &attr; 247} 248 249static void spliceAttrOutOfList(AttributeList &attr, AttributeList *&head) { 250 if (head == &attr) { 251 head = attr.getNext(); 252 return; 253 } 254 255 AttributeList *cur = head; 256 while (true) { 257 assert(cur && cur->getNext() && "ran out of attrs?"); 258 if (cur->getNext() == &attr) { 259 cur->setNext(attr.getNext()); 260 return; 261 } 262 cur = cur->getNext(); 263 } 264} 265 266static void moveAttrFromListToList(AttributeList &attr, 267 AttributeList *&fromList, 268 AttributeList *&toList) { 269 spliceAttrOutOfList(attr, fromList); 270 spliceAttrIntoList(attr, toList); 271} 272 273/// The location of a type attribute. 274enum TypeAttrLocation { 275 /// The attribute is in the decl-specifier-seq. 276 TAL_DeclSpec, 277 /// The attribute is part of a DeclaratorChunk. 278 TAL_DeclChunk, 279 /// The attribute is immediately after the declaration's name. 280 TAL_DeclName 281}; 282 283static void processTypeAttrs(TypeProcessingState &state, 284 QualType &type, TypeAttrLocation TAL, 285 AttributeList *attrs); 286 287static bool handleFunctionTypeAttr(TypeProcessingState &state, 288 AttributeList &attr, 289 QualType &type); 290 291static bool handleObjCGCTypeAttr(TypeProcessingState &state, 292 AttributeList &attr, QualType &type); 293 294static bool handleObjCOwnershipTypeAttr(TypeProcessingState &state, 295 AttributeList &attr, QualType &type); 296 297static bool handleObjCPointerTypeAttr(TypeProcessingState &state, 298 AttributeList &attr, QualType &type) { 299 if (attr.getKind() == AttributeList::AT_ObjCGC) 300 return handleObjCGCTypeAttr(state, attr, type); 301 assert(attr.getKind() == AttributeList::AT_ObjCOwnership); 302 return handleObjCOwnershipTypeAttr(state, attr, type); 303} 304 305/// Given that an objc_gc attribute was written somewhere on a 306/// declaration *other* than on the declarator itself (for which, use 307/// distributeObjCPointerTypeAttrFromDeclarator), and given that it 308/// didn't apply in whatever position it was written in, try to move 309/// it to a more appropriate position. 310static void distributeObjCPointerTypeAttr(TypeProcessingState &state, 311 AttributeList &attr, 312 QualType type) { 313 Declarator &declarator = state.getDeclarator(); 314 for (unsigned i = state.getCurrentChunkIndex(); i != 0; --i) { 315 DeclaratorChunk &chunk = declarator.getTypeObject(i-1); 316 switch (chunk.Kind) { 317 case DeclaratorChunk::Pointer: 318 case DeclaratorChunk::BlockPointer: 319 moveAttrFromListToList(attr, state.getCurrentAttrListRef(), 320 chunk.getAttrListRef()); 321 return; 322 323 case DeclaratorChunk::Paren: 324 case DeclaratorChunk::Array: 325 continue; 326 327 // Don't walk through these. 328 case DeclaratorChunk::Reference: 329 case DeclaratorChunk::Function: 330 case DeclaratorChunk::MemberPointer: 331 goto error; 332 } 333 } 334 error: 335 336 diagnoseBadTypeAttribute(state.getSema(), attr, type); 337} 338 339/// Distribute an objc_gc type attribute that was written on the 340/// declarator. 341static void 342distributeObjCPointerTypeAttrFromDeclarator(TypeProcessingState &state, 343 AttributeList &attr, 344 QualType &declSpecType) { 345 Declarator &declarator = state.getDeclarator(); 346 347 // objc_gc goes on the innermost pointer to something that's not a 348 // pointer. 349 unsigned innermost = -1U; 350 bool considerDeclSpec = true; 351 for (unsigned i = 0, e = declarator.getNumTypeObjects(); i != e; ++i) { 352 DeclaratorChunk &chunk = declarator.getTypeObject(i); 353 switch (chunk.Kind) { 354 case DeclaratorChunk::Pointer: 355 case DeclaratorChunk::BlockPointer: 356 innermost = i; 357 continue; 358 359 case DeclaratorChunk::Reference: 360 case DeclaratorChunk::MemberPointer: 361 case DeclaratorChunk::Paren: 362 case DeclaratorChunk::Array: 363 continue; 364 365 case DeclaratorChunk::Function: 366 considerDeclSpec = false; 367 goto done; 368 } 369 } 370 done: 371 372 // That might actually be the decl spec if we weren't blocked by 373 // anything in the declarator. 374 if (considerDeclSpec) { 375 if (handleObjCPointerTypeAttr(state, attr, declSpecType)) { 376 // Splice the attribute into the decl spec. Prevents the 377 // attribute from being applied multiple times and gives 378 // the source-location-filler something to work with. 379 state.saveDeclSpecAttrs(); 380 moveAttrFromListToList(attr, declarator.getAttrListRef(), 381 declarator.getMutableDeclSpec().getAttributes().getListRef()); 382 return; 383 } 384 } 385 386 // Otherwise, if we found an appropriate chunk, splice the attribute 387 // into it. 388 if (innermost != -1U) { 389 moveAttrFromListToList(attr, declarator.getAttrListRef(), 390 declarator.getTypeObject(innermost).getAttrListRef()); 391 return; 392 } 393 394 // Otherwise, diagnose when we're done building the type. 395 spliceAttrOutOfList(attr, declarator.getAttrListRef()); 396 state.addIgnoredTypeAttr(attr); 397} 398 399/// A function type attribute was written somewhere in a declaration 400/// *other* than on the declarator itself or in the decl spec. Given 401/// that it didn't apply in whatever position it was written in, try 402/// to move it to a more appropriate position. 403static void distributeFunctionTypeAttr(TypeProcessingState &state, 404 AttributeList &attr, 405 QualType type) { 406 Declarator &declarator = state.getDeclarator(); 407 408 // Try to push the attribute from the return type of a function to 409 // the function itself. 410 for (unsigned i = state.getCurrentChunkIndex(); i != 0; --i) { 411 DeclaratorChunk &chunk = declarator.getTypeObject(i-1); 412 switch (chunk.Kind) { 413 case DeclaratorChunk::Function: 414 moveAttrFromListToList(attr, state.getCurrentAttrListRef(), 415 chunk.getAttrListRef()); 416 return; 417 418 case DeclaratorChunk::Paren: 419 case DeclaratorChunk::Pointer: 420 case DeclaratorChunk::BlockPointer: 421 case DeclaratorChunk::Array: 422 case DeclaratorChunk::Reference: 423 case DeclaratorChunk::MemberPointer: 424 continue; 425 } 426 } 427 428 diagnoseBadTypeAttribute(state.getSema(), attr, type); 429} 430 431/// Try to distribute a function type attribute to the innermost 432/// function chunk or type. Returns true if the attribute was 433/// distributed, false if no location was found. 434static bool 435distributeFunctionTypeAttrToInnermost(TypeProcessingState &state, 436 AttributeList &attr, 437 AttributeList *&attrList, 438 QualType &declSpecType) { 439 Declarator &declarator = state.getDeclarator(); 440 441 // Put it on the innermost function chunk, if there is one. 442 for (unsigned i = 0, e = declarator.getNumTypeObjects(); i != e; ++i) { 443 DeclaratorChunk &chunk = declarator.getTypeObject(i); 444 if (chunk.Kind != DeclaratorChunk::Function) continue; 445 446 moveAttrFromListToList(attr, attrList, chunk.getAttrListRef()); 447 return true; 448 } 449 450 if (handleFunctionTypeAttr(state, attr, declSpecType)) { 451 spliceAttrOutOfList(attr, attrList); 452 return true; 453 } 454 455 return false; 456} 457 458/// A function type attribute was written in the decl spec. Try to 459/// apply it somewhere. 460static void 461distributeFunctionTypeAttrFromDeclSpec(TypeProcessingState &state, 462 AttributeList &attr, 463 QualType &declSpecType) { 464 state.saveDeclSpecAttrs(); 465 466 // C++11 attributes before the decl specifiers actually appertain to 467 // the declarators. Move them straight there. We don't support the 468 // 'put them wherever you like' semantics we allow for GNU attributes. 469 if (attr.isCXX11Attribute()) { 470 moveAttrFromListToList(attr, state.getCurrentAttrListRef(), 471 state.getDeclarator().getAttrListRef()); 472 return; 473 } 474 475 // Try to distribute to the innermost. 476 if (distributeFunctionTypeAttrToInnermost(state, attr, 477 state.getCurrentAttrListRef(), 478 declSpecType)) 479 return; 480 481 // If that failed, diagnose the bad attribute when the declarator is 482 // fully built. 483 state.addIgnoredTypeAttr(attr); 484} 485 486/// A function type attribute was written on the declarator. Try to 487/// apply it somewhere. 488static void 489distributeFunctionTypeAttrFromDeclarator(TypeProcessingState &state, 490 AttributeList &attr, 491 QualType &declSpecType) { 492 Declarator &declarator = state.getDeclarator(); 493 494 // Try to distribute to the innermost. 495 if (distributeFunctionTypeAttrToInnermost(state, attr, 496 declarator.getAttrListRef(), 497 declSpecType)) 498 return; 499 500 // If that failed, diagnose the bad attribute when the declarator is 501 // fully built. 502 spliceAttrOutOfList(attr, declarator.getAttrListRef()); 503 state.addIgnoredTypeAttr(attr); 504} 505 506/// \brief Given that there are attributes written on the declarator 507/// itself, try to distribute any type attributes to the appropriate 508/// declarator chunk. 509/// 510/// These are attributes like the following: 511/// int f ATTR; 512/// int (f ATTR)(); 513/// but not necessarily this: 514/// int f() ATTR; 515static void distributeTypeAttrsFromDeclarator(TypeProcessingState &state, 516 QualType &declSpecType) { 517 // Collect all the type attributes from the declarator itself. 518 assert(state.getDeclarator().getAttributes() && "declarator has no attrs!"); 519 AttributeList *attr = state.getDeclarator().getAttributes(); 520 AttributeList *next; 521 do { 522 next = attr->getNext(); 523 524 // Do not distribute C++11 attributes. They have strict rules for what 525 // they appertain to. 526 if (attr->isCXX11Attribute()) 527 continue; 528 529 switch (attr->getKind()) { 530 OBJC_POINTER_TYPE_ATTRS_CASELIST: 531 distributeObjCPointerTypeAttrFromDeclarator(state, *attr, declSpecType); 532 break; 533 534 case AttributeList::AT_NSReturnsRetained: 535 if (!state.getSema().getLangOpts().ObjCAutoRefCount) 536 break; 537 // fallthrough 538 539 FUNCTION_TYPE_ATTRS_CASELIST: 540 distributeFunctionTypeAttrFromDeclarator(state, *attr, declSpecType); 541 break; 542 543 default: 544 break; 545 } 546 } while ((attr = next)); 547} 548 549/// Add a synthetic '()' to a block-literal declarator if it is 550/// required, given the return type. 551static void maybeSynthesizeBlockSignature(TypeProcessingState &state, 552 QualType declSpecType) { 553 Declarator &declarator = state.getDeclarator(); 554 555 // First, check whether the declarator would produce a function, 556 // i.e. whether the innermost semantic chunk is a function. 557 if (declarator.isFunctionDeclarator()) { 558 // If so, make that declarator a prototyped declarator. 559 declarator.getFunctionTypeInfo().hasPrototype = true; 560 return; 561 } 562 563 // If there are any type objects, the type as written won't name a 564 // function, regardless of the decl spec type. This is because a 565 // block signature declarator is always an abstract-declarator, and 566 // abstract-declarators can't just be parentheses chunks. Therefore 567 // we need to build a function chunk unless there are no type 568 // objects and the decl spec type is a function. 569 if (!declarator.getNumTypeObjects() && declSpecType->isFunctionType()) 570 return; 571 572 // Note that there *are* cases with invalid declarators where 573 // declarators consist solely of parentheses. In general, these 574 // occur only in failed efforts to make function declarators, so 575 // faking up the function chunk is still the right thing to do. 576 577 // Otherwise, we need to fake up a function declarator. 578 SourceLocation loc = declarator.getLocStart(); 579 580 // ...and *prepend* it to the declarator. 581 SourceLocation NoLoc; 582 declarator.AddInnermostTypeInfo(DeclaratorChunk::getFunction( 583 /*HasProto=*/true, 584 /*IsAmbiguous=*/false, 585 /*LParenLoc=*/NoLoc, 586 /*ArgInfo=*/0, 587 /*NumArgs=*/0, 588 /*EllipsisLoc=*/NoLoc, 589 /*RParenLoc=*/NoLoc, 590 /*TypeQuals=*/0, 591 /*RefQualifierIsLvalueRef=*/true, 592 /*RefQualifierLoc=*/NoLoc, 593 /*ConstQualifierLoc=*/NoLoc, 594 /*VolatileQualifierLoc=*/NoLoc, 595 /*MutableLoc=*/NoLoc, 596 EST_None, 597 /*ESpecLoc=*/NoLoc, 598 /*Exceptions=*/0, 599 /*ExceptionRanges=*/0, 600 /*NumExceptions=*/0, 601 /*NoexceptExpr=*/0, 602 loc, loc, declarator)); 603 604 // For consistency, make sure the state still has us as processing 605 // the decl spec. 606 assert(state.getCurrentChunkIndex() == declarator.getNumTypeObjects() - 1); 607 state.setCurrentChunkIndex(declarator.getNumTypeObjects()); 608} 609 610/// \brief Convert the specified declspec to the appropriate type 611/// object. 612/// \param state Specifies the declarator containing the declaration specifier 613/// to be converted, along with other associated processing state. 614/// \returns The type described by the declaration specifiers. This function 615/// never returns null. 616static QualType ConvertDeclSpecToType(TypeProcessingState &state) { 617 // FIXME: Should move the logic from DeclSpec::Finish to here for validity 618 // checking. 619 620 Sema &S = state.getSema(); 621 Declarator &declarator = state.getDeclarator(); 622 const DeclSpec &DS = declarator.getDeclSpec(); 623 SourceLocation DeclLoc = declarator.getIdentifierLoc(); 624 if (DeclLoc.isInvalid()) 625 DeclLoc = DS.getLocStart(); 626 627 ASTContext &Context = S.Context; 628 629 QualType Result; 630 switch (DS.getTypeSpecType()) { 631 case DeclSpec::TST_void: 632 Result = Context.VoidTy; 633 break; 634 case DeclSpec::TST_char: 635 if (DS.getTypeSpecSign() == DeclSpec::TSS_unspecified) 636 Result = Context.CharTy; 637 else if (DS.getTypeSpecSign() == DeclSpec::TSS_signed) 638 Result = Context.SignedCharTy; 639 else { 640 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unsigned && 641 "Unknown TSS value"); 642 Result = Context.UnsignedCharTy; 643 } 644 break; 645 case DeclSpec::TST_wchar: 646 if (DS.getTypeSpecSign() == DeclSpec::TSS_unspecified) 647 Result = Context.WCharTy; 648 else if (DS.getTypeSpecSign() == DeclSpec::TSS_signed) { 649 S.Diag(DS.getTypeSpecSignLoc(), diag::ext_invalid_sign_spec) 650 << DS.getSpecifierName(DS.getTypeSpecType()); 651 Result = Context.getSignedWCharType(); 652 } else { 653 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unsigned && 654 "Unknown TSS value"); 655 S.Diag(DS.getTypeSpecSignLoc(), diag::ext_invalid_sign_spec) 656 << DS.getSpecifierName(DS.getTypeSpecType()); 657 Result = Context.getUnsignedWCharType(); 658 } 659 break; 660 case DeclSpec::TST_char16: 661 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unspecified && 662 "Unknown TSS value"); 663 Result = Context.Char16Ty; 664 break; 665 case DeclSpec::TST_char32: 666 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unspecified && 667 "Unknown TSS value"); 668 Result = Context.Char32Ty; 669 break; 670 case DeclSpec::TST_unspecified: 671 // "<proto1,proto2>" is an objc qualified ID with a missing id. 672 if (DeclSpec::ProtocolQualifierListTy PQ = DS.getProtocolQualifiers()) { 673 Result = Context.getObjCObjectType(Context.ObjCBuiltinIdTy, 674 (ObjCProtocolDecl*const*)PQ, 675 DS.getNumProtocolQualifiers()); 676 Result = Context.getObjCObjectPointerType(Result); 677 break; 678 } 679 680 // If this is a missing declspec in a block literal return context, then it 681 // is inferred from the return statements inside the block. 682 // The declspec is always missing in a lambda expr context; it is either 683 // specified with a trailing return type or inferred. 684 if (declarator.getContext() == Declarator::LambdaExprContext || 685 isOmittedBlockReturnType(declarator)) { 686 Result = Context.DependentTy; 687 break; 688 } 689 690 // Unspecified typespec defaults to int in C90. However, the C90 grammar 691 // [C90 6.5] only allows a decl-spec if there was *some* type-specifier, 692 // type-qualifier, or storage-class-specifier. If not, emit an extwarn. 693 // Note that the one exception to this is function definitions, which are 694 // allowed to be completely missing a declspec. This is handled in the 695 // parser already though by it pretending to have seen an 'int' in this 696 // case. 697 if (S.getLangOpts().ImplicitInt) { 698 // In C89 mode, we only warn if there is a completely missing declspec 699 // when one is not allowed. 700 if (DS.isEmpty()) { 701 S.Diag(DeclLoc, diag::ext_missing_declspec) 702 << DS.getSourceRange() 703 << FixItHint::CreateInsertion(DS.getLocStart(), "int"); 704 } 705 } else if (!DS.hasTypeSpecifier()) { 706 // C99 and C++ require a type specifier. For example, C99 6.7.2p2 says: 707 // "At least one type specifier shall be given in the declaration 708 // specifiers in each declaration, and in the specifier-qualifier list in 709 // each struct declaration and type name." 710 // FIXME: Does Microsoft really have the implicit int extension in C++? 711 if (S.getLangOpts().CPlusPlus && 712 !S.getLangOpts().MicrosoftExt) { 713 S.Diag(DeclLoc, diag::err_missing_type_specifier) 714 << DS.getSourceRange(); 715 716 // When this occurs in C++ code, often something is very broken with the 717 // value being declared, poison it as invalid so we don't get chains of 718 // errors. 719 declarator.setInvalidType(true); 720 } else { 721 S.Diag(DeclLoc, diag::ext_missing_type_specifier) 722 << DS.getSourceRange(); 723 } 724 } 725 726 // FALL THROUGH. 727 case DeclSpec::TST_int: { 728 if (DS.getTypeSpecSign() != DeclSpec::TSS_unsigned) { 729 switch (DS.getTypeSpecWidth()) { 730 case DeclSpec::TSW_unspecified: Result = Context.IntTy; break; 731 case DeclSpec::TSW_short: Result = Context.ShortTy; break; 732 case DeclSpec::TSW_long: Result = Context.LongTy; break; 733 case DeclSpec::TSW_longlong: 734 Result = Context.LongLongTy; 735 736 // 'long long' is a C99 or C++11 feature. 737 if (!S.getLangOpts().C99) { 738 if (S.getLangOpts().CPlusPlus) 739 S.Diag(DS.getTypeSpecWidthLoc(), 740 S.getLangOpts().CPlusPlus11 ? 741 diag::warn_cxx98_compat_longlong : diag::ext_cxx11_longlong); 742 else 743 S.Diag(DS.getTypeSpecWidthLoc(), diag::ext_c99_longlong); 744 } 745 break; 746 } 747 } else { 748 switch (DS.getTypeSpecWidth()) { 749 case DeclSpec::TSW_unspecified: Result = Context.UnsignedIntTy; break; 750 case DeclSpec::TSW_short: Result = Context.UnsignedShortTy; break; 751 case DeclSpec::TSW_long: Result = Context.UnsignedLongTy; break; 752 case DeclSpec::TSW_longlong: 753 Result = Context.UnsignedLongLongTy; 754 755 // 'long long' is a C99 or C++11 feature. 756 if (!S.getLangOpts().C99) { 757 if (S.getLangOpts().CPlusPlus) 758 S.Diag(DS.getTypeSpecWidthLoc(), 759 S.getLangOpts().CPlusPlus11 ? 760 diag::warn_cxx98_compat_longlong : diag::ext_cxx11_longlong); 761 else 762 S.Diag(DS.getTypeSpecWidthLoc(), diag::ext_c99_longlong); 763 } 764 break; 765 } 766 } 767 break; 768 } 769 case DeclSpec::TST_int128: 770 if (!S.PP.getTargetInfo().hasInt128Type()) 771 S.Diag(DS.getTypeSpecTypeLoc(), diag::err_int128_unsupported); 772 if (DS.getTypeSpecSign() == DeclSpec::TSS_unsigned) 773 Result = Context.UnsignedInt128Ty; 774 else 775 Result = Context.Int128Ty; 776 break; 777 case DeclSpec::TST_half: Result = Context.HalfTy; break; 778 case DeclSpec::TST_float: Result = Context.FloatTy; break; 779 case DeclSpec::TST_double: 780 if (DS.getTypeSpecWidth() == DeclSpec::TSW_long) 781 Result = Context.LongDoubleTy; 782 else 783 Result = Context.DoubleTy; 784 785 if (S.getLangOpts().OpenCL && !S.getOpenCLOptions().cl_khr_fp64) { 786 S.Diag(DS.getTypeSpecTypeLoc(), diag::err_double_requires_fp64); 787 declarator.setInvalidType(true); 788 } 789 break; 790 case DeclSpec::TST_bool: Result = Context.BoolTy; break; // _Bool or bool 791 case DeclSpec::TST_decimal32: // _Decimal32 792 case DeclSpec::TST_decimal64: // _Decimal64 793 case DeclSpec::TST_decimal128: // _Decimal128 794 S.Diag(DS.getTypeSpecTypeLoc(), diag::err_decimal_unsupported); 795 Result = Context.IntTy; 796 declarator.setInvalidType(true); 797 break; 798 case DeclSpec::TST_class: 799 case DeclSpec::TST_enum: 800 case DeclSpec::TST_union: 801 case DeclSpec::TST_struct: 802 case DeclSpec::TST_interface: { 803 TypeDecl *D = dyn_cast_or_null<TypeDecl>(DS.getRepAsDecl()); 804 if (!D) { 805 // This can happen in C++ with ambiguous lookups. 806 Result = Context.IntTy; 807 declarator.setInvalidType(true); 808 break; 809 } 810 811 // If the type is deprecated or unavailable, diagnose it. 812 S.DiagnoseUseOfDecl(D, DS.getTypeSpecTypeNameLoc()); 813 814 assert(DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 && 815 DS.getTypeSpecSign() == 0 && "No qualifiers on tag names!"); 816 817 // TypeQuals handled by caller. 818 Result = Context.getTypeDeclType(D); 819 820 // In both C and C++, make an ElaboratedType. 821 ElaboratedTypeKeyword Keyword 822 = ElaboratedType::getKeywordForTypeSpec(DS.getTypeSpecType()); 823 Result = S.getElaboratedType(Keyword, DS.getTypeSpecScope(), Result); 824 break; 825 } 826 case DeclSpec::TST_typename: { 827 assert(DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 && 828 DS.getTypeSpecSign() == 0 && 829 "Can't handle qualifiers on typedef names yet!"); 830 Result = S.GetTypeFromParser(DS.getRepAsType()); 831 if (Result.isNull()) 832 declarator.setInvalidType(true); 833 else if (DeclSpec::ProtocolQualifierListTy PQ 834 = DS.getProtocolQualifiers()) { 835 if (const ObjCObjectType *ObjT = Result->getAs<ObjCObjectType>()) { 836 // Silently drop any existing protocol qualifiers. 837 // TODO: determine whether that's the right thing to do. 838 if (ObjT->getNumProtocols()) 839 Result = ObjT->getBaseType(); 840 841 if (DS.getNumProtocolQualifiers()) 842 Result = Context.getObjCObjectType(Result, 843 (ObjCProtocolDecl*const*) PQ, 844 DS.getNumProtocolQualifiers()); 845 } else if (Result->isObjCIdType()) { 846 // id<protocol-list> 847 Result = Context.getObjCObjectType(Context.ObjCBuiltinIdTy, 848 (ObjCProtocolDecl*const*) PQ, 849 DS.getNumProtocolQualifiers()); 850 Result = Context.getObjCObjectPointerType(Result); 851 } else if (Result->isObjCClassType()) { 852 // Class<protocol-list> 853 Result = Context.getObjCObjectType(Context.ObjCBuiltinClassTy, 854 (ObjCProtocolDecl*const*) PQ, 855 DS.getNumProtocolQualifiers()); 856 Result = Context.getObjCObjectPointerType(Result); 857 } else { 858 S.Diag(DeclLoc, diag::err_invalid_protocol_qualifiers) 859 << DS.getSourceRange(); 860 declarator.setInvalidType(true); 861 } 862 } 863 864 // TypeQuals handled by caller. 865 break; 866 } 867 case DeclSpec::TST_typeofType: 868 // FIXME: Preserve type source info. 869 Result = S.GetTypeFromParser(DS.getRepAsType()); 870 assert(!Result.isNull() && "Didn't get a type for typeof?"); 871 if (!Result->isDependentType()) 872 if (const TagType *TT = Result->getAs<TagType>()) 873 S.DiagnoseUseOfDecl(TT->getDecl(), DS.getTypeSpecTypeLoc()); 874 // TypeQuals handled by caller. 875 Result = Context.getTypeOfType(Result); 876 break; 877 case DeclSpec::TST_typeofExpr: { 878 Expr *E = DS.getRepAsExpr(); 879 assert(E && "Didn't get an expression for typeof?"); 880 // TypeQuals handled by caller. 881 Result = S.BuildTypeofExprType(E, DS.getTypeSpecTypeLoc()); 882 if (Result.isNull()) { 883 Result = Context.IntTy; 884 declarator.setInvalidType(true); 885 } 886 break; 887 } 888 case DeclSpec::TST_decltype: { 889 Expr *E = DS.getRepAsExpr(); 890 assert(E && "Didn't get an expression for decltype?"); 891 // TypeQuals handled by caller. 892 Result = S.BuildDecltypeType(E, DS.getTypeSpecTypeLoc()); 893 if (Result.isNull()) { 894 Result = Context.IntTy; 895 declarator.setInvalidType(true); 896 } 897 break; 898 } 899 case DeclSpec::TST_underlyingType: 900 Result = S.GetTypeFromParser(DS.getRepAsType()); 901 assert(!Result.isNull() && "Didn't get a type for __underlying_type?"); 902 Result = S.BuildUnaryTransformType(Result, 903 UnaryTransformType::EnumUnderlyingType, 904 DS.getTypeSpecTypeLoc()); 905 if (Result.isNull()) { 906 Result = Context.IntTy; 907 declarator.setInvalidType(true); 908 } 909 break; 910 911 case DeclSpec::TST_auto: { 912 // TypeQuals handled by caller. 913 Result = Context.getAutoType(QualType()); 914 break; 915 } 916 917 case DeclSpec::TST_unknown_anytype: 918 Result = Context.UnknownAnyTy; 919 break; 920 921 case DeclSpec::TST_atomic: 922 Result = S.GetTypeFromParser(DS.getRepAsType()); 923 assert(!Result.isNull() && "Didn't get a type for _Atomic?"); 924 Result = S.BuildAtomicType(Result, DS.getTypeSpecTypeLoc()); 925 if (Result.isNull()) { 926 Result = Context.IntTy; 927 declarator.setInvalidType(true); 928 } 929 break; 930 931 case DeclSpec::TST_image1d_t: 932 Result = Context.OCLImage1dTy; 933 break; 934 935 case DeclSpec::TST_image1d_array_t: 936 Result = Context.OCLImage1dArrayTy; 937 break; 938 939 case DeclSpec::TST_image1d_buffer_t: 940 Result = Context.OCLImage1dBufferTy; 941 break; 942 943 case DeclSpec::TST_image2d_t: 944 Result = Context.OCLImage2dTy; 945 break; 946 947 case DeclSpec::TST_image2d_array_t: 948 Result = Context.OCLImage2dArrayTy; 949 break; 950 951 case DeclSpec::TST_image3d_t: 952 Result = Context.OCLImage3dTy; 953 break; 954 955 case DeclSpec::TST_sampler_t: 956 Result = Context.OCLSamplerTy; 957 break; 958 959 case DeclSpec::TST_event_t: 960 Result = Context.OCLEventTy; 961 break; 962 963 case DeclSpec::TST_error: 964 Result = Context.IntTy; 965 declarator.setInvalidType(true); 966 break; 967 } 968 969 // Handle complex types. 970 if (DS.getTypeSpecComplex() == DeclSpec::TSC_complex) { 971 if (S.getLangOpts().Freestanding) 972 S.Diag(DS.getTypeSpecComplexLoc(), diag::ext_freestanding_complex); 973 Result = Context.getComplexType(Result); 974 } else if (DS.isTypeAltiVecVector()) { 975 unsigned typeSize = static_cast<unsigned>(Context.getTypeSize(Result)); 976 assert(typeSize > 0 && "type size for vector must be greater than 0 bits"); 977 VectorType::VectorKind VecKind = VectorType::AltiVecVector; 978 if (DS.isTypeAltiVecPixel()) 979 VecKind = VectorType::AltiVecPixel; 980 else if (DS.isTypeAltiVecBool()) 981 VecKind = VectorType::AltiVecBool; 982 Result = Context.getVectorType(Result, 128/typeSize, VecKind); 983 } 984 985 // FIXME: Imaginary. 986 if (DS.getTypeSpecComplex() == DeclSpec::TSC_imaginary) 987 S.Diag(DS.getTypeSpecComplexLoc(), diag::err_imaginary_not_supported); 988 989 // Before we process any type attributes, synthesize a block literal 990 // function declarator if necessary. 991 if (declarator.getContext() == Declarator::BlockLiteralContext) 992 maybeSynthesizeBlockSignature(state, Result); 993 994 // Apply any type attributes from the decl spec. This may cause the 995 // list of type attributes to be temporarily saved while the type 996 // attributes are pushed around. 997 if (AttributeList *attrs = DS.getAttributes().getList()) 998 processTypeAttrs(state, Result, TAL_DeclSpec, attrs); 999 1000 // Apply const/volatile/restrict qualifiers to T. 1001 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 1002 1003 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 1004 // or incomplete types shall not be restrict-qualified." C++ also allows 1005 // restrict-qualified references. 1006 if (TypeQuals & DeclSpec::TQ_restrict) { 1007 if (Result->isAnyPointerType() || Result->isReferenceType()) { 1008 QualType EltTy; 1009 if (Result->isObjCObjectPointerType()) 1010 EltTy = Result; 1011 else 1012 EltTy = Result->isPointerType() ? 1013 Result->getAs<PointerType>()->getPointeeType() : 1014 Result->getAs<ReferenceType>()->getPointeeType(); 1015 1016 // If we have a pointer or reference, the pointee must have an object 1017 // incomplete type. 1018 if (!EltTy->isIncompleteOrObjectType()) { 1019 S.Diag(DS.getRestrictSpecLoc(), 1020 diag::err_typecheck_invalid_restrict_invalid_pointee) 1021 << EltTy << DS.getSourceRange(); 1022 TypeQuals &= ~DeclSpec::TQ_restrict; // Remove the restrict qualifier. 1023 } 1024 } else { 1025 S.Diag(DS.getRestrictSpecLoc(), 1026 diag::err_typecheck_invalid_restrict_not_pointer) 1027 << Result << DS.getSourceRange(); 1028 TypeQuals &= ~DeclSpec::TQ_restrict; // Remove the restrict qualifier. 1029 } 1030 } 1031 1032 // Warn about CV qualifiers on functions: C99 6.7.3p8: "If the specification 1033 // of a function type includes any type qualifiers, the behavior is 1034 // undefined." 1035 if (Result->isFunctionType() && TypeQuals) { 1036 // Get some location to point at, either the C or V location. 1037 SourceLocation Loc; 1038 if (TypeQuals & DeclSpec::TQ_const) 1039 Loc = DS.getConstSpecLoc(); 1040 else if (TypeQuals & DeclSpec::TQ_volatile) 1041 Loc = DS.getVolatileSpecLoc(); 1042 else { 1043 assert((TypeQuals & DeclSpec::TQ_restrict) && 1044 "Has CVR quals but not C, V, or R?"); 1045 Loc = DS.getRestrictSpecLoc(); 1046 } 1047 S.Diag(Loc, diag::warn_typecheck_function_qualifiers) 1048 << Result << DS.getSourceRange(); 1049 } 1050 1051 // C++ [dcl.ref]p1: 1052 // Cv-qualified references are ill-formed except when the 1053 // cv-qualifiers are introduced through the use of a typedef 1054 // (7.1.3) or of a template type argument (14.3), in which 1055 // case the cv-qualifiers are ignored. 1056 // FIXME: Shouldn't we be checking SCS_typedef here? 1057 if (DS.getTypeSpecType() == DeclSpec::TST_typename && 1058 TypeQuals && Result->isReferenceType()) { 1059 TypeQuals &= ~DeclSpec::TQ_const; 1060 TypeQuals &= ~DeclSpec::TQ_volatile; 1061 } 1062 1063 // C90 6.5.3 constraints: "The same type qualifier shall not appear more 1064 // than once in the same specifier-list or qualifier-list, either directly 1065 // or via one or more typedefs." 1066 if (!S.getLangOpts().C99 && !S.getLangOpts().CPlusPlus 1067 && TypeQuals & Result.getCVRQualifiers()) { 1068 if (TypeQuals & DeclSpec::TQ_const && Result.isConstQualified()) { 1069 S.Diag(DS.getConstSpecLoc(), diag::ext_duplicate_declspec) 1070 << "const"; 1071 } 1072 1073 if (TypeQuals & DeclSpec::TQ_volatile && Result.isVolatileQualified()) { 1074 S.Diag(DS.getVolatileSpecLoc(), diag::ext_duplicate_declspec) 1075 << "volatile"; 1076 } 1077 1078 // C90 doesn't have restrict, so it doesn't force us to produce a warning 1079 // in this case. 1080 } 1081 1082 Qualifiers Quals = Qualifiers::fromCVRMask(TypeQuals); 1083 Result = Context.getQualifiedType(Result, Quals); 1084 } 1085 1086 return Result; 1087} 1088 1089static std::string getPrintableNameForEntity(DeclarationName Entity) { 1090 if (Entity) 1091 return Entity.getAsString(); 1092 1093 return "type name"; 1094} 1095 1096QualType Sema::BuildQualifiedType(QualType T, SourceLocation Loc, 1097 Qualifiers Qs) { 1098 // Enforce C99 6.7.3p2: "Types other than pointer types derived from 1099 // object or incomplete types shall not be restrict-qualified." 1100 if (Qs.hasRestrict()) { 1101 unsigned DiagID = 0; 1102 QualType ProblemTy; 1103 1104 const Type *Ty = T->getCanonicalTypeInternal().getTypePtr(); 1105 if (const ReferenceType *RTy = dyn_cast<ReferenceType>(Ty)) { 1106 if (!RTy->getPointeeType()->isIncompleteOrObjectType()) { 1107 DiagID = diag::err_typecheck_invalid_restrict_invalid_pointee; 1108 ProblemTy = T->getAs<ReferenceType>()->getPointeeType(); 1109 } 1110 } else if (const PointerType *PTy = dyn_cast<PointerType>(Ty)) { 1111 if (!PTy->getPointeeType()->isIncompleteOrObjectType()) { 1112 DiagID = diag::err_typecheck_invalid_restrict_invalid_pointee; 1113 ProblemTy = T->getAs<PointerType>()->getPointeeType(); 1114 } 1115 } else if (const MemberPointerType *PTy = dyn_cast<MemberPointerType>(Ty)) { 1116 if (!PTy->getPointeeType()->isIncompleteOrObjectType()) { 1117 DiagID = diag::err_typecheck_invalid_restrict_invalid_pointee; 1118 ProblemTy = T->getAs<PointerType>()->getPointeeType(); 1119 } 1120 } else if (!Ty->isDependentType()) { 1121 // FIXME: this deserves a proper diagnostic 1122 DiagID = diag::err_typecheck_invalid_restrict_invalid_pointee; 1123 ProblemTy = T; 1124 } 1125 1126 if (DiagID) { 1127 Diag(Loc, DiagID) << ProblemTy; 1128 Qs.removeRestrict(); 1129 } 1130 } 1131 1132 return Context.getQualifiedType(T, Qs); 1133} 1134 1135/// \brief Build a paren type including \p T. 1136QualType Sema::BuildParenType(QualType T) { 1137 return Context.getParenType(T); 1138} 1139 1140/// Given that we're building a pointer or reference to the given 1141static QualType inferARCLifetimeForPointee(Sema &S, QualType type, 1142 SourceLocation loc, 1143 bool isReference) { 1144 // Bail out if retention is unrequired or already specified. 1145 if (!type->isObjCLifetimeType() || 1146 type.getObjCLifetime() != Qualifiers::OCL_None) 1147 return type; 1148 1149 Qualifiers::ObjCLifetime implicitLifetime = Qualifiers::OCL_None; 1150 1151 // If the object type is const-qualified, we can safely use 1152 // __unsafe_unretained. This is safe (because there are no read 1153 // barriers), and it'll be safe to coerce anything but __weak* to 1154 // the resulting type. 1155 if (type.isConstQualified()) { 1156 implicitLifetime = Qualifiers::OCL_ExplicitNone; 1157 1158 // Otherwise, check whether the static type does not require 1159 // retaining. This currently only triggers for Class (possibly 1160 // protocol-qualifed, and arrays thereof). 1161 } else if (type->isObjCARCImplicitlyUnretainedType()) { 1162 implicitLifetime = Qualifiers::OCL_ExplicitNone; 1163 1164 // If we are in an unevaluated context, like sizeof, skip adding a 1165 // qualification. 1166 } else if (S.isUnevaluatedContext()) { 1167 return type; 1168 1169 // If that failed, give an error and recover using __strong. __strong 1170 // is the option most likely to prevent spurious second-order diagnostics, 1171 // like when binding a reference to a field. 1172 } else { 1173 // These types can show up in private ivars in system headers, so 1174 // we need this to not be an error in those cases. Instead we 1175 // want to delay. 1176 if (S.DelayedDiagnostics.shouldDelayDiagnostics()) { 1177 S.DelayedDiagnostics.add( 1178 sema::DelayedDiagnostic::makeForbiddenType(loc, 1179 diag::err_arc_indirect_no_ownership, type, isReference)); 1180 } else { 1181 S.Diag(loc, diag::err_arc_indirect_no_ownership) << type << isReference; 1182 } 1183 implicitLifetime = Qualifiers::OCL_Strong; 1184 } 1185 assert(implicitLifetime && "didn't infer any lifetime!"); 1186 1187 Qualifiers qs; 1188 qs.addObjCLifetime(implicitLifetime); 1189 return S.Context.getQualifiedType(type, qs); 1190} 1191 1192/// \brief Build a pointer type. 1193/// 1194/// \param T The type to which we'll be building a pointer. 1195/// 1196/// \param Loc The location of the entity whose type involves this 1197/// pointer type or, if there is no such entity, the location of the 1198/// type that will have pointer type. 1199/// 1200/// \param Entity The name of the entity that involves the pointer 1201/// type, if known. 1202/// 1203/// \returns A suitable pointer type, if there are no 1204/// errors. Otherwise, returns a NULL type. 1205QualType Sema::BuildPointerType(QualType T, 1206 SourceLocation Loc, DeclarationName Entity) { 1207 if (T->isReferenceType()) { 1208 // C++ 8.3.2p4: There shall be no ... pointers to references ... 1209 Diag(Loc, diag::err_illegal_decl_pointer_to_reference) 1210 << getPrintableNameForEntity(Entity) << T; 1211 return QualType(); 1212 } 1213 1214 assert(!T->isObjCObjectType() && "Should build ObjCObjectPointerType"); 1215 1216 // In ARC, it is forbidden to build pointers to unqualified pointers. 1217 if (getLangOpts().ObjCAutoRefCount) 1218 T = inferARCLifetimeForPointee(*this, T, Loc, /*reference*/ false); 1219 1220 // Build the pointer type. 1221 return Context.getPointerType(T); 1222} 1223 1224/// \brief Build a reference type. 1225/// 1226/// \param T The type to which we'll be building a reference. 1227/// 1228/// \param Loc The location of the entity whose type involves this 1229/// reference type or, if there is no such entity, the location of the 1230/// type that will have reference type. 1231/// 1232/// \param Entity The name of the entity that involves the reference 1233/// type, if known. 1234/// 1235/// \returns A suitable reference type, if there are no 1236/// errors. Otherwise, returns a NULL type. 1237QualType Sema::BuildReferenceType(QualType T, bool SpelledAsLValue, 1238 SourceLocation Loc, 1239 DeclarationName Entity) { 1240 assert(Context.getCanonicalType(T) != Context.OverloadTy && 1241 "Unresolved overloaded function type"); 1242 1243 // C++0x [dcl.ref]p6: 1244 // If a typedef (7.1.3), a type template-parameter (14.3.1), or a 1245 // decltype-specifier (7.1.6.2) denotes a type TR that is a reference to a 1246 // type T, an attempt to create the type "lvalue reference to cv TR" creates 1247 // the type "lvalue reference to T", while an attempt to create the type 1248 // "rvalue reference to cv TR" creates the type TR. 1249 bool LValueRef = SpelledAsLValue || T->getAs<LValueReferenceType>(); 1250 1251 // C++ [dcl.ref]p4: There shall be no references to references. 1252 // 1253 // According to C++ DR 106, references to references are only 1254 // diagnosed when they are written directly (e.g., "int & &"), 1255 // but not when they happen via a typedef: 1256 // 1257 // typedef int& intref; 1258 // typedef intref& intref2; 1259 // 1260 // Parser::ParseDeclaratorInternal diagnoses the case where 1261 // references are written directly; here, we handle the 1262 // collapsing of references-to-references as described in C++0x. 1263 // DR 106 and 540 introduce reference-collapsing into C++98/03. 1264 1265 // C++ [dcl.ref]p1: 1266 // A declarator that specifies the type "reference to cv void" 1267 // is ill-formed. 1268 if (T->isVoidType()) { 1269 Diag(Loc, diag::err_reference_to_void); 1270 return QualType(); 1271 } 1272 1273 // In ARC, it is forbidden to build references to unqualified pointers. 1274 if (getLangOpts().ObjCAutoRefCount) 1275 T = inferARCLifetimeForPointee(*this, T, Loc, /*reference*/ true); 1276 1277 // Handle restrict on references. 1278 if (LValueRef) 1279 return Context.getLValueReferenceType(T, SpelledAsLValue); 1280 return Context.getRValueReferenceType(T); 1281} 1282 1283/// Check whether the specified array size makes the array type a VLA. If so, 1284/// return true, if not, return the size of the array in SizeVal. 1285static bool isArraySizeVLA(Sema &S, Expr *ArraySize, llvm::APSInt &SizeVal) { 1286 // If the size is an ICE, it certainly isn't a VLA. If we're in a GNU mode 1287 // (like gnu99, but not c99) accept any evaluatable value as an extension. 1288 class VLADiagnoser : public Sema::VerifyICEDiagnoser { 1289 public: 1290 VLADiagnoser() : Sema::VerifyICEDiagnoser(true) {} 1291 1292 virtual void diagnoseNotICE(Sema &S, SourceLocation Loc, SourceRange SR) { 1293 } 1294 1295 virtual void diagnoseFold(Sema &S, SourceLocation Loc, SourceRange SR) { 1296 S.Diag(Loc, diag::ext_vla_folded_to_constant) << SR; 1297 } 1298 } Diagnoser; 1299 1300 return S.VerifyIntegerConstantExpression(ArraySize, &SizeVal, Diagnoser, 1301 S.LangOpts.GNUMode).isInvalid(); 1302} 1303 1304 1305/// \brief Build an array type. 1306/// 1307/// \param T The type of each element in the array. 1308/// 1309/// \param ASM C99 array size modifier (e.g., '*', 'static'). 1310/// 1311/// \param ArraySize Expression describing the size of the array. 1312/// 1313/// \param Brackets The range from the opening '[' to the closing ']'. 1314/// 1315/// \param Entity The name of the entity that involves the array 1316/// type, if known. 1317/// 1318/// \returns A suitable array type, if there are no errors. Otherwise, 1319/// returns a NULL type. 1320QualType Sema::BuildArrayType(QualType T, ArrayType::ArraySizeModifier ASM, 1321 Expr *ArraySize, unsigned Quals, 1322 SourceRange Brackets, DeclarationName Entity) { 1323 1324 SourceLocation Loc = Brackets.getBegin(); 1325 if (getLangOpts().CPlusPlus) { 1326 // C++ [dcl.array]p1: 1327 // T is called the array element type; this type shall not be a reference 1328 // type, the (possibly cv-qualified) type void, a function type or an 1329 // abstract class type. 1330 // 1331 // C++ [dcl.array]p3: 1332 // When several "array of" specifications are adjacent, [...] only the 1333 // first of the constant expressions that specify the bounds of the arrays 1334 // may be omitted. 1335 // 1336 // Note: function types are handled in the common path with C. 1337 if (T->isReferenceType()) { 1338 Diag(Loc, diag::err_illegal_decl_array_of_references) 1339 << getPrintableNameForEntity(Entity) << T; 1340 return QualType(); 1341 } 1342 1343 if (T->isVoidType() || T->isIncompleteArrayType()) { 1344 Diag(Loc, diag::err_illegal_decl_array_incomplete_type) << T; 1345 return QualType(); 1346 } 1347 1348 if (RequireNonAbstractType(Brackets.getBegin(), T, 1349 diag::err_array_of_abstract_type)) 1350 return QualType(); 1351 1352 } else { 1353 // C99 6.7.5.2p1: If the element type is an incomplete or function type, 1354 // reject it (e.g. void ary[7], struct foo ary[7], void ary[7]()) 1355 if (RequireCompleteType(Loc, T, 1356 diag::err_illegal_decl_array_incomplete_type)) 1357 return QualType(); 1358 } 1359 1360 if (T->isFunctionType()) { 1361 Diag(Loc, diag::err_illegal_decl_array_of_functions) 1362 << getPrintableNameForEntity(Entity) << T; 1363 return QualType(); 1364 } 1365 1366 if (T->getContainedAutoType()) { 1367 Diag(Loc, diag::err_illegal_decl_array_of_auto) 1368 << getPrintableNameForEntity(Entity) << T; 1369 return QualType(); 1370 } 1371 1372 if (const RecordType *EltTy = T->getAs<RecordType>()) { 1373 // If the element type is a struct or union that contains a variadic 1374 // array, accept it as a GNU extension: C99 6.7.2.1p2. 1375 if (EltTy->getDecl()->hasFlexibleArrayMember()) 1376 Diag(Loc, diag::ext_flexible_array_in_array) << T; 1377 } else if (T->isObjCObjectType()) { 1378 Diag(Loc, diag::err_objc_array_of_interfaces) << T; 1379 return QualType(); 1380 } 1381 1382 // Do placeholder conversions on the array size expression. 1383 if (ArraySize && ArraySize->hasPlaceholderType()) { 1384 ExprResult Result = CheckPlaceholderExpr(ArraySize); 1385 if (Result.isInvalid()) return QualType(); 1386 ArraySize = Result.take(); 1387 } 1388 1389 // Do lvalue-to-rvalue conversions on the array size expression. 1390 if (ArraySize && !ArraySize->isRValue()) { 1391 ExprResult Result = DefaultLvalueConversion(ArraySize); 1392 if (Result.isInvalid()) 1393 return QualType(); 1394 1395 ArraySize = Result.take(); 1396 } 1397 1398 // C99 6.7.5.2p1: The size expression shall have integer type. 1399 // C++11 allows contextual conversions to such types. 1400 if (!getLangOpts().CPlusPlus11 && 1401 ArraySize && !ArraySize->isTypeDependent() && 1402 !ArraySize->getType()->isIntegralOrUnscopedEnumerationType()) { 1403 Diag(ArraySize->getLocStart(), diag::err_array_size_non_int) 1404 << ArraySize->getType() << ArraySize->getSourceRange(); 1405 return QualType(); 1406 } 1407 1408 llvm::APSInt ConstVal(Context.getTypeSize(Context.getSizeType())); 1409 if (!ArraySize) { 1410 if (ASM == ArrayType::Star) 1411 T = Context.getVariableArrayType(T, 0, ASM, Quals, Brackets); 1412 else 1413 T = Context.getIncompleteArrayType(T, ASM, Quals); 1414 } else if (ArraySize->isTypeDependent() || ArraySize->isValueDependent()) { 1415 T = Context.getDependentSizedArrayType(T, ArraySize, ASM, Quals, Brackets); 1416 } else if ((!T->isDependentType() && !T->isIncompleteType() && 1417 !T->isConstantSizeType()) || 1418 isArraySizeVLA(*this, ArraySize, ConstVal)) { 1419 // Even in C++11, don't allow contextual conversions in the array bound 1420 // of a VLA. 1421 if (getLangOpts().CPlusPlus11 && 1422 !ArraySize->getType()->isIntegralOrUnscopedEnumerationType()) { 1423 Diag(ArraySize->getLocStart(), diag::err_array_size_non_int) 1424 << ArraySize->getType() << ArraySize->getSourceRange(); 1425 return QualType(); 1426 } 1427 1428 // C99: an array with an element type that has a non-constant-size is a VLA. 1429 // C99: an array with a non-ICE size is a VLA. We accept any expression 1430 // that we can fold to a non-zero positive value as an extension. 1431 T = Context.getVariableArrayType(T, ArraySize, ASM, Quals, Brackets); 1432 } else { 1433 // C99 6.7.5.2p1: If the expression is a constant expression, it shall 1434 // have a value greater than zero. 1435 if (ConstVal.isSigned() && ConstVal.isNegative()) { 1436 if (Entity) 1437 Diag(ArraySize->getLocStart(), diag::err_decl_negative_array_size) 1438 << getPrintableNameForEntity(Entity) << ArraySize->getSourceRange(); 1439 else 1440 Diag(ArraySize->getLocStart(), diag::err_typecheck_negative_array_size) 1441 << ArraySize->getSourceRange(); 1442 return QualType(); 1443 } 1444 if (ConstVal == 0) { 1445 // GCC accepts zero sized static arrays. We allow them when 1446 // we're not in a SFINAE context. 1447 Diag(ArraySize->getLocStart(), 1448 isSFINAEContext()? diag::err_typecheck_zero_array_size 1449 : diag::ext_typecheck_zero_array_size) 1450 << ArraySize->getSourceRange(); 1451 1452 if (ASM == ArrayType::Static) { 1453 Diag(ArraySize->getLocStart(), 1454 diag::warn_typecheck_zero_static_array_size) 1455 << ArraySize->getSourceRange(); 1456 ASM = ArrayType::Normal; 1457 } 1458 } else if (!T->isDependentType() && !T->isVariablyModifiedType() && 1459 !T->isIncompleteType()) { 1460 // Is the array too large? 1461 unsigned ActiveSizeBits 1462 = ConstantArrayType::getNumAddressingBits(Context, T, ConstVal); 1463 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) 1464 Diag(ArraySize->getLocStart(), diag::err_array_too_large) 1465 << ConstVal.toString(10) 1466 << ArraySize->getSourceRange(); 1467 } 1468 1469 T = Context.getConstantArrayType(T, ConstVal, ASM, Quals); 1470 } 1471 1472 // OpenCL v1.2 s6.9.d: variable length arrays are not supported. 1473 if (getLangOpts().OpenCL && T->isVariableArrayType()) { 1474 Diag(Loc, diag::err_opencl_vla); 1475 return QualType(); 1476 } 1477 // If this is not C99, extwarn about VLA's and C99 array size modifiers. 1478 if (!getLangOpts().C99) { 1479 if (T->isVariableArrayType()) { 1480 // Prohibit the use of non-POD types in VLAs. 1481 QualType BaseT = Context.getBaseElementType(T); 1482 if (!T->isDependentType() && 1483 !BaseT.isPODType(Context) && 1484 !BaseT->isObjCLifetimeType()) { 1485 Diag(Loc, diag::err_vla_non_pod) 1486 << BaseT; 1487 return QualType(); 1488 } 1489 // Prohibit the use of VLAs during template argument deduction. 1490 else if (isSFINAEContext()) { 1491 Diag(Loc, diag::err_vla_in_sfinae); 1492 return QualType(); 1493 } 1494 // Just extwarn about VLAs. 1495 else 1496 Diag(Loc, diag::ext_vla); 1497 } else if (ASM != ArrayType::Normal || Quals != 0) 1498 Diag(Loc, 1499 getLangOpts().CPlusPlus? diag::err_c99_array_usage_cxx 1500 : diag::ext_c99_array_usage) << ASM; 1501 } 1502 1503 if (T->isVariableArrayType()) { 1504 // Warn about VLAs for -Wvla. 1505 Diag(Loc, diag::warn_vla_used); 1506 } 1507 1508 return T; 1509} 1510 1511/// \brief Build an ext-vector type. 1512/// 1513/// Run the required checks for the extended vector type. 1514QualType Sema::BuildExtVectorType(QualType T, Expr *ArraySize, 1515 SourceLocation AttrLoc) { 1516 // unlike gcc's vector_size attribute, we do not allow vectors to be defined 1517 // in conjunction with complex types (pointers, arrays, functions, etc.). 1518 if (!T->isDependentType() && 1519 !T->isIntegerType() && !T->isRealFloatingType()) { 1520 Diag(AttrLoc, diag::err_attribute_invalid_vector_type) << T; 1521 return QualType(); 1522 } 1523 1524 if (!ArraySize->isTypeDependent() && !ArraySize->isValueDependent()) { 1525 llvm::APSInt vecSize(32); 1526 if (!ArraySize->isIntegerConstantExpr(vecSize, Context)) { 1527 Diag(AttrLoc, diag::err_attribute_argument_not_int) 1528 << "ext_vector_type" << ArraySize->getSourceRange(); 1529 return QualType(); 1530 } 1531 1532 // unlike gcc's vector_size attribute, the size is specified as the 1533 // number of elements, not the number of bytes. 1534 unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue()); 1535 1536 if (vectorSize == 0) { 1537 Diag(AttrLoc, diag::err_attribute_zero_size) 1538 << ArraySize->getSourceRange(); 1539 return QualType(); 1540 } 1541 1542 return Context.getExtVectorType(T, vectorSize); 1543 } 1544 1545 return Context.getDependentSizedExtVectorType(T, ArraySize, AttrLoc); 1546} 1547 1548/// \brief Build a function type. 1549/// 1550/// This routine checks the function type according to C++ rules and 1551/// under the assumption that the result type and parameter types have 1552/// just been instantiated from a template. It therefore duplicates 1553/// some of the behavior of GetTypeForDeclarator, but in a much 1554/// simpler form that is only suitable for this narrow use case. 1555/// 1556/// \param T The return type of the function. 1557/// 1558/// \param ParamTypes The parameter types of the function. This array 1559/// will be modified to account for adjustments to the types of the 1560/// function parameters. 1561/// 1562/// \param NumParamTypes The number of parameter types in ParamTypes. 1563/// 1564/// \param Variadic Whether this is a variadic function type. 1565/// 1566/// \param HasTrailingReturn Whether this function has a trailing return type. 1567/// 1568/// \param Quals The cvr-qualifiers to be applied to the function type. 1569/// 1570/// \param Loc The location of the entity whose type involves this 1571/// function type or, if there is no such entity, the location of the 1572/// type that will have function type. 1573/// 1574/// \param Entity The name of the entity that involves the function 1575/// type, if known. 1576/// 1577/// \returns A suitable function type, if there are no 1578/// errors. Otherwise, returns a NULL type. 1579QualType Sema::BuildFunctionType(QualType T, 1580 QualType *ParamTypes, 1581 unsigned NumParamTypes, 1582 bool Variadic, bool HasTrailingReturn, 1583 unsigned Quals, 1584 RefQualifierKind RefQualifier, 1585 SourceLocation Loc, DeclarationName Entity, 1586 FunctionType::ExtInfo Info) { 1587 if (T->isArrayType() || T->isFunctionType()) { 1588 Diag(Loc, diag::err_func_returning_array_function) 1589 << T->isFunctionType() << T; 1590 return QualType(); 1591 } 1592 1593 // Functions cannot return half FP. 1594 if (T->isHalfType()) { 1595 Diag(Loc, diag::err_parameters_retval_cannot_have_fp16_type) << 1 << 1596 FixItHint::CreateInsertion(Loc, "*"); 1597 return QualType(); 1598 } 1599 1600 bool Invalid = false; 1601 for (unsigned Idx = 0; Idx < NumParamTypes; ++Idx) { 1602 // FIXME: Loc is too inprecise here, should use proper locations for args. 1603 QualType ParamType = Context.getAdjustedParameterType(ParamTypes[Idx]); 1604 if (ParamType->isVoidType()) { 1605 Diag(Loc, diag::err_param_with_void_type); 1606 Invalid = true; 1607 } else if (ParamType->isHalfType()) { 1608 // Disallow half FP arguments. 1609 Diag(Loc, diag::err_parameters_retval_cannot_have_fp16_type) << 0 << 1610 FixItHint::CreateInsertion(Loc, "*"); 1611 Invalid = true; 1612 } 1613 1614 ParamTypes[Idx] = ParamType; 1615 } 1616 1617 if (Invalid) 1618 return QualType(); 1619 1620 FunctionProtoType::ExtProtoInfo EPI; 1621 EPI.Variadic = Variadic; 1622 EPI.HasTrailingReturn = HasTrailingReturn; 1623 EPI.TypeQuals = Quals; 1624 EPI.RefQualifier = RefQualifier; 1625 EPI.ExtInfo = Info; 1626 1627 return Context.getFunctionType(T, ParamTypes, NumParamTypes, EPI); 1628} 1629 1630/// \brief Build a member pointer type \c T Class::*. 1631/// 1632/// \param T the type to which the member pointer refers. 1633/// \param Class the class type into which the member pointer points. 1634/// \param Loc the location where this type begins 1635/// \param Entity the name of the entity that will have this member pointer type 1636/// 1637/// \returns a member pointer type, if successful, or a NULL type if there was 1638/// an error. 1639QualType Sema::BuildMemberPointerType(QualType T, QualType Class, 1640 SourceLocation Loc, 1641 DeclarationName Entity) { 1642 // Verify that we're not building a pointer to pointer to function with 1643 // exception specification. 1644 if (CheckDistantExceptionSpec(T)) { 1645 Diag(Loc, diag::err_distant_exception_spec); 1646 1647 // FIXME: If we're doing this as part of template instantiation, 1648 // we should return immediately. 1649 1650 // Build the type anyway, but use the canonical type so that the 1651 // exception specifiers are stripped off. 1652 T = Context.getCanonicalType(T); 1653 } 1654 1655 // C++ 8.3.3p3: A pointer to member shall not point to ... a member 1656 // with reference type, or "cv void." 1657 if (T->isReferenceType()) { 1658 Diag(Loc, diag::err_illegal_decl_mempointer_to_reference) 1659 << (Entity? Entity.getAsString() : "type name") << T; 1660 return QualType(); 1661 } 1662 1663 if (T->isVoidType()) { 1664 Diag(Loc, diag::err_illegal_decl_mempointer_to_void) 1665 << (Entity? Entity.getAsString() : "type name"); 1666 return QualType(); 1667 } 1668 1669 if (!Class->isDependentType() && !Class->isRecordType()) { 1670 Diag(Loc, diag::err_mempointer_in_nonclass_type) << Class; 1671 return QualType(); 1672 } 1673 1674 // C++ allows the class type in a member pointer to be an incomplete type. 1675 // In the Microsoft ABI, the size of the member pointer can vary 1676 // according to the class type, which means that we really need a 1677 // complete type if possible, which means we need to instantiate templates. 1678 // 1679 // For now, just require a complete type, which will instantiate 1680 // templates. This will also error if the type is just forward-declared, 1681 // which is a bug, but it's a bug that saves us from dealing with some 1682 // complexities at the moment. 1683 if (Context.getTargetInfo().getCXXABI().isMicrosoft() && 1684 RequireCompleteType(Loc, Class, diag::err_incomplete_type)) 1685 return QualType(); 1686 1687 return Context.getMemberPointerType(T, Class.getTypePtr()); 1688} 1689 1690/// \brief Build a block pointer type. 1691/// 1692/// \param T The type to which we'll be building a block pointer. 1693/// 1694/// \param Loc The source location, used for diagnostics. 1695/// 1696/// \param Entity The name of the entity that involves the block pointer 1697/// type, if known. 1698/// 1699/// \returns A suitable block pointer type, if there are no 1700/// errors. Otherwise, returns a NULL type. 1701QualType Sema::BuildBlockPointerType(QualType T, 1702 SourceLocation Loc, 1703 DeclarationName Entity) { 1704 if (!T->isFunctionType()) { 1705 Diag(Loc, diag::err_nonfunction_block_type); 1706 return QualType(); 1707 } 1708 1709 return Context.getBlockPointerType(T); 1710} 1711 1712QualType Sema::GetTypeFromParser(ParsedType Ty, TypeSourceInfo **TInfo) { 1713 QualType QT = Ty.get(); 1714 if (QT.isNull()) { 1715 if (TInfo) *TInfo = 0; 1716 return QualType(); 1717 } 1718 1719 TypeSourceInfo *DI = 0; 1720 if (const LocInfoType *LIT = dyn_cast<LocInfoType>(QT)) { 1721 QT = LIT->getType(); 1722 DI = LIT->getTypeSourceInfo(); 1723 } 1724 1725 if (TInfo) *TInfo = DI; 1726 return QT; 1727} 1728 1729static void transferARCOwnershipToDeclaratorChunk(TypeProcessingState &state, 1730 Qualifiers::ObjCLifetime ownership, 1731 unsigned chunkIndex); 1732 1733/// Given that this is the declaration of a parameter under ARC, 1734/// attempt to infer attributes and such for pointer-to-whatever 1735/// types. 1736static void inferARCWriteback(TypeProcessingState &state, 1737 QualType &declSpecType) { 1738 Sema &S = state.getSema(); 1739 Declarator &declarator = state.getDeclarator(); 1740 1741 // TODO: should we care about decl qualifiers? 1742 1743 // Check whether the declarator has the expected form. We walk 1744 // from the inside out in order to make the block logic work. 1745 unsigned outermostPointerIndex = 0; 1746 bool isBlockPointer = false; 1747 unsigned numPointers = 0; 1748 for (unsigned i = 0, e = declarator.getNumTypeObjects(); i != e; ++i) { 1749 unsigned chunkIndex = i; 1750 DeclaratorChunk &chunk = declarator.getTypeObject(chunkIndex); 1751 switch (chunk.Kind) { 1752 case DeclaratorChunk::Paren: 1753 // Ignore parens. 1754 break; 1755 1756 case DeclaratorChunk::Reference: 1757 case DeclaratorChunk::Pointer: 1758 // Count the number of pointers. Treat references 1759 // interchangeably as pointers; if they're mis-ordered, normal 1760 // type building will discover that. 1761 outermostPointerIndex = chunkIndex; 1762 numPointers++; 1763 break; 1764 1765 case DeclaratorChunk::BlockPointer: 1766 // If we have a pointer to block pointer, that's an acceptable 1767 // indirect reference; anything else is not an application of 1768 // the rules. 1769 if (numPointers != 1) return; 1770 numPointers++; 1771 outermostPointerIndex = chunkIndex; 1772 isBlockPointer = true; 1773 1774 // We don't care about pointer structure in return values here. 1775 goto done; 1776 1777 case DeclaratorChunk::Array: // suppress if written (id[])? 1778 case DeclaratorChunk::Function: 1779 case DeclaratorChunk::MemberPointer: 1780 return; 1781 } 1782 } 1783 done: 1784 1785 // If we have *one* pointer, then we want to throw the qualifier on 1786 // the declaration-specifiers, which means that it needs to be a 1787 // retainable object type. 1788 if (numPointers == 1) { 1789 // If it's not a retainable object type, the rule doesn't apply. 1790 if (!declSpecType->isObjCRetainableType()) return; 1791 1792 // If it already has lifetime, don't do anything. 1793 if (declSpecType.getObjCLifetime()) return; 1794 1795 // Otherwise, modify the type in-place. 1796 Qualifiers qs; 1797 1798 if (declSpecType->isObjCARCImplicitlyUnretainedType()) 1799 qs.addObjCLifetime(Qualifiers::OCL_ExplicitNone); 1800 else 1801 qs.addObjCLifetime(Qualifiers::OCL_Autoreleasing); 1802 declSpecType = S.Context.getQualifiedType(declSpecType, qs); 1803 1804 // If we have *two* pointers, then we want to throw the qualifier on 1805 // the outermost pointer. 1806 } else if (numPointers == 2) { 1807 // If we don't have a block pointer, we need to check whether the 1808 // declaration-specifiers gave us something that will turn into a 1809 // retainable object pointer after we slap the first pointer on it. 1810 if (!isBlockPointer && !declSpecType->isObjCObjectType()) 1811 return; 1812 1813 // Look for an explicit lifetime attribute there. 1814 DeclaratorChunk &chunk = declarator.getTypeObject(outermostPointerIndex); 1815 if (chunk.Kind != DeclaratorChunk::Pointer && 1816 chunk.Kind != DeclaratorChunk::BlockPointer) 1817 return; 1818 for (const AttributeList *attr = chunk.getAttrs(); attr; 1819 attr = attr->getNext()) 1820 if (attr->getKind() == AttributeList::AT_ObjCOwnership) 1821 return; 1822 1823 transferARCOwnershipToDeclaratorChunk(state, Qualifiers::OCL_Autoreleasing, 1824 outermostPointerIndex); 1825 1826 // Any other number of pointers/references does not trigger the rule. 1827 } else return; 1828 1829 // TODO: mark whether we did this inference? 1830} 1831 1832static void DiagnoseIgnoredQualifiers(unsigned Quals, 1833 SourceLocation ConstQualLoc, 1834 SourceLocation VolatileQualLoc, 1835 SourceLocation RestrictQualLoc, 1836 Sema& S) { 1837 std::string QualStr; 1838 unsigned NumQuals = 0; 1839 SourceLocation Loc; 1840 1841 FixItHint ConstFixIt; 1842 FixItHint VolatileFixIt; 1843 FixItHint RestrictFixIt; 1844 1845 const SourceManager &SM = S.getSourceManager(); 1846 1847 // FIXME: The locations here are set kind of arbitrarily. It'd be nicer to 1848 // find a range and grow it to encompass all the qualifiers, regardless of 1849 // the order in which they textually appear. 1850 if (Quals & Qualifiers::Const) { 1851 ConstFixIt = FixItHint::CreateRemoval(ConstQualLoc); 1852 QualStr = "const"; 1853 ++NumQuals; 1854 if (!Loc.isValid() || SM.isBeforeInTranslationUnit(ConstQualLoc, Loc)) 1855 Loc = ConstQualLoc; 1856 } 1857 if (Quals & Qualifiers::Volatile) { 1858 VolatileFixIt = FixItHint::CreateRemoval(VolatileQualLoc); 1859 QualStr += (NumQuals == 0 ? "volatile" : " volatile"); 1860 ++NumQuals; 1861 if (!Loc.isValid() || SM.isBeforeInTranslationUnit(VolatileQualLoc, Loc)) 1862 Loc = VolatileQualLoc; 1863 } 1864 if (Quals & Qualifiers::Restrict) { 1865 RestrictFixIt = FixItHint::CreateRemoval(RestrictQualLoc); 1866 QualStr += (NumQuals == 0 ? "restrict" : " restrict"); 1867 ++NumQuals; 1868 if (!Loc.isValid() || SM.isBeforeInTranslationUnit(RestrictQualLoc, Loc)) 1869 Loc = RestrictQualLoc; 1870 } 1871 1872 assert(NumQuals > 0 && "No known qualifiers?"); 1873 1874 S.Diag(Loc, diag::warn_qual_return_type) 1875 << QualStr << NumQuals << ConstFixIt << VolatileFixIt << RestrictFixIt; 1876} 1877 1878static QualType GetDeclSpecTypeForDeclarator(TypeProcessingState &state, 1879 TypeSourceInfo *&ReturnTypeInfo) { 1880 Sema &SemaRef = state.getSema(); 1881 Declarator &D = state.getDeclarator(); 1882 QualType T; 1883 ReturnTypeInfo = 0; 1884 1885 // The TagDecl owned by the DeclSpec. 1886 TagDecl *OwnedTagDecl = 0; 1887 1888 switch (D.getName().getKind()) { 1889 case UnqualifiedId::IK_ImplicitSelfParam: 1890 case UnqualifiedId::IK_OperatorFunctionId: 1891 case UnqualifiedId::IK_Identifier: 1892 case UnqualifiedId::IK_LiteralOperatorId: 1893 case UnqualifiedId::IK_TemplateId: 1894 T = ConvertDeclSpecToType(state); 1895 1896 if (!D.isInvalidType() && D.getDeclSpec().isTypeSpecOwned()) { 1897 OwnedTagDecl = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 1898 // Owned declaration is embedded in declarator. 1899 OwnedTagDecl->setEmbeddedInDeclarator(true); 1900 } 1901 break; 1902 1903 case UnqualifiedId::IK_ConstructorName: 1904 case UnqualifiedId::IK_ConstructorTemplateId: 1905 case UnqualifiedId::IK_DestructorName: 1906 // Constructors and destructors don't have return types. Use 1907 // "void" instead. 1908 T = SemaRef.Context.VoidTy; 1909 if (AttributeList *attrs = D.getDeclSpec().getAttributes().getList()) 1910 processTypeAttrs(state, T, TAL_DeclSpec, attrs); 1911 break; 1912 1913 case UnqualifiedId::IK_ConversionFunctionId: 1914 // The result type of a conversion function is the type that it 1915 // converts to. 1916 T = SemaRef.GetTypeFromParser(D.getName().ConversionFunctionId, 1917 &ReturnTypeInfo); 1918 break; 1919 } 1920 1921 if (D.getAttributes()) 1922 distributeTypeAttrsFromDeclarator(state, T); 1923 1924 // C++11 [dcl.spec.auto]p5: reject 'auto' if it is not in an allowed context. 1925 // In C++11, a function declarator using 'auto' must have a trailing return 1926 // type (this is checked later) and we can skip this. In other languages 1927 // using auto, we need to check regardless. 1928 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto && 1929 (!SemaRef.getLangOpts().CPlusPlus11 || !D.isFunctionDeclarator())) { 1930 int Error = -1; 1931 1932 switch (D.getContext()) { 1933 case Declarator::KNRTypeListContext: 1934 llvm_unreachable("K&R type lists aren't allowed in C++"); 1935 case Declarator::LambdaExprContext: 1936 llvm_unreachable("Can't specify a type specifier in lambda grammar"); 1937 case Declarator::ObjCParameterContext: 1938 case Declarator::ObjCResultContext: 1939 case Declarator::PrototypeContext: 1940 Error = 0; // Function prototype 1941 break; 1942 case Declarator::MemberContext: 1943 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_static) 1944 break; 1945 switch (cast<TagDecl>(SemaRef.CurContext)->getTagKind()) { 1946 case TTK_Enum: llvm_unreachable("unhandled tag kind"); 1947 case TTK_Struct: Error = 1; /* Struct member */ break; 1948 case TTK_Union: Error = 2; /* Union member */ break; 1949 case TTK_Class: Error = 3; /* Class member */ break; 1950 case TTK_Interface: Error = 4; /* Interface member */ break; 1951 } 1952 break; 1953 case Declarator::CXXCatchContext: 1954 case Declarator::ObjCCatchContext: 1955 Error = 5; // Exception declaration 1956 break; 1957 case Declarator::TemplateParamContext: 1958 Error = 6; // Template parameter 1959 break; 1960 case Declarator::BlockLiteralContext: 1961 Error = 7; // Block literal 1962 break; 1963 case Declarator::TemplateTypeArgContext: 1964 Error = 8; // Template type argument 1965 break; 1966 case Declarator::AliasDeclContext: 1967 case Declarator::AliasTemplateContext: 1968 Error = 10; // Type alias 1969 break; 1970 case Declarator::TrailingReturnContext: 1971 Error = 11; // Function return type 1972 break; 1973 case Declarator::TypeNameContext: 1974 Error = 12; // Generic 1975 break; 1976 case Declarator::FileContext: 1977 case Declarator::BlockContext: 1978 case Declarator::ForContext: 1979 case Declarator::ConditionContext: 1980 case Declarator::CXXNewContext: 1981 break; 1982 } 1983 1984 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 1985 Error = 9; 1986 1987 // In Objective-C it is an error to use 'auto' on a function declarator. 1988 if (D.isFunctionDeclarator()) 1989 Error = 11; 1990 1991 // C++11 [dcl.spec.auto]p2: 'auto' is always fine if the declarator 1992 // contains a trailing return type. That is only legal at the outermost 1993 // level. Check all declarator chunks (outermost first) anyway, to give 1994 // better diagnostics. 1995 if (SemaRef.getLangOpts().CPlusPlus11 && Error != -1) { 1996 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 1997 unsigned chunkIndex = e - i - 1; 1998 state.setCurrentChunkIndex(chunkIndex); 1999 DeclaratorChunk &DeclType = D.getTypeObject(chunkIndex); 2000 if (DeclType.Kind == DeclaratorChunk::Function) { 2001 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun; 2002 if (FTI.hasTrailingReturnType()) { 2003 Error = -1; 2004 break; 2005 } 2006 } 2007 } 2008 } 2009 2010 if (Error != -1) { 2011 SemaRef.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 2012 diag::err_auto_not_allowed) 2013 << Error; 2014 T = SemaRef.Context.IntTy; 2015 D.setInvalidType(true); 2016 } else 2017 SemaRef.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 2018 diag::warn_cxx98_compat_auto_type_specifier); 2019 } 2020 2021 if (SemaRef.getLangOpts().CPlusPlus && 2022 OwnedTagDecl && OwnedTagDecl->isCompleteDefinition()) { 2023 // Check the contexts where C++ forbids the declaration of a new class 2024 // or enumeration in a type-specifier-seq. 2025 switch (D.getContext()) { 2026 case Declarator::TrailingReturnContext: 2027 // Class and enumeration definitions are syntactically not allowed in 2028 // trailing return types. 2029 llvm_unreachable("parser should not have allowed this"); 2030 break; 2031 case Declarator::FileContext: 2032 case Declarator::MemberContext: 2033 case Declarator::BlockContext: 2034 case Declarator::ForContext: 2035 case Declarator::BlockLiteralContext: 2036 case Declarator::LambdaExprContext: 2037 // C++11 [dcl.type]p3: 2038 // A type-specifier-seq shall not define a class or enumeration unless 2039 // it appears in the type-id of an alias-declaration (7.1.3) that is not 2040 // the declaration of a template-declaration. 2041 case Declarator::AliasDeclContext: 2042 break; 2043 case Declarator::AliasTemplateContext: 2044 SemaRef.Diag(OwnedTagDecl->getLocation(), 2045 diag::err_type_defined_in_alias_template) 2046 << SemaRef.Context.getTypeDeclType(OwnedTagDecl); 2047 D.setInvalidType(true); 2048 break; 2049 case Declarator::TypeNameContext: 2050 case Declarator::TemplateParamContext: 2051 case Declarator::CXXNewContext: 2052 case Declarator::CXXCatchContext: 2053 case Declarator::ObjCCatchContext: 2054 case Declarator::TemplateTypeArgContext: 2055 SemaRef.Diag(OwnedTagDecl->getLocation(), 2056 diag::err_type_defined_in_type_specifier) 2057 << SemaRef.Context.getTypeDeclType(OwnedTagDecl); 2058 D.setInvalidType(true); 2059 break; 2060 case Declarator::PrototypeContext: 2061 case Declarator::ObjCParameterContext: 2062 case Declarator::ObjCResultContext: 2063 case Declarator::KNRTypeListContext: 2064 // C++ [dcl.fct]p6: 2065 // Types shall not be defined in return or parameter types. 2066 SemaRef.Diag(OwnedTagDecl->getLocation(), 2067 diag::err_type_defined_in_param_type) 2068 << SemaRef.Context.getTypeDeclType(OwnedTagDecl); 2069 D.setInvalidType(true); 2070 break; 2071 case Declarator::ConditionContext: 2072 // C++ 6.4p2: 2073 // The type-specifier-seq shall not contain typedef and shall not declare 2074 // a new class or enumeration. 2075 SemaRef.Diag(OwnedTagDecl->getLocation(), 2076 diag::err_type_defined_in_condition); 2077 D.setInvalidType(true); 2078 break; 2079 } 2080 } 2081 2082 return T; 2083} 2084 2085static std::string getFunctionQualifiersAsString(const FunctionProtoType *FnTy){ 2086 std::string Quals = 2087 Qualifiers::fromCVRMask(FnTy->getTypeQuals()).getAsString(); 2088 2089 switch (FnTy->getRefQualifier()) { 2090 case RQ_None: 2091 break; 2092 2093 case RQ_LValue: 2094 if (!Quals.empty()) 2095 Quals += ' '; 2096 Quals += '&'; 2097 break; 2098 2099 case RQ_RValue: 2100 if (!Quals.empty()) 2101 Quals += ' '; 2102 Quals += "&&"; 2103 break; 2104 } 2105 2106 return Quals; 2107} 2108 2109/// Check that the function type T, which has a cv-qualifier or a ref-qualifier, 2110/// can be contained within the declarator chunk DeclType, and produce an 2111/// appropriate diagnostic if not. 2112static void checkQualifiedFunction(Sema &S, QualType T, 2113 DeclaratorChunk &DeclType) { 2114 // C++98 [dcl.fct]p4 / C++11 [dcl.fct]p6: a function type with a 2115 // cv-qualifier or a ref-qualifier can only appear at the topmost level 2116 // of a type. 2117 int DiagKind = -1; 2118 switch (DeclType.Kind) { 2119 case DeclaratorChunk::Paren: 2120 case DeclaratorChunk::MemberPointer: 2121 // These cases are permitted. 2122 return; 2123 case DeclaratorChunk::Array: 2124 case DeclaratorChunk::Function: 2125 // These cases don't allow function types at all; no need to diagnose the 2126 // qualifiers separately. 2127 return; 2128 case DeclaratorChunk::BlockPointer: 2129 DiagKind = 0; 2130 break; 2131 case DeclaratorChunk::Pointer: 2132 DiagKind = 1; 2133 break; 2134 case DeclaratorChunk::Reference: 2135 DiagKind = 2; 2136 break; 2137 } 2138 2139 assert(DiagKind != -1); 2140 S.Diag(DeclType.Loc, diag::err_compound_qualified_function_type) 2141 << DiagKind << isa<FunctionType>(T.IgnoreParens()) << T 2142 << getFunctionQualifiersAsString(T->castAs<FunctionProtoType>()); 2143} 2144 2145/// Produce an approprioate diagnostic for an ambiguity between a function 2146/// declarator and a C++ direct-initializer. 2147static void warnAboutAmbiguousFunction(Sema &S, Declarator &D, 2148 DeclaratorChunk &DeclType, QualType RT) { 2149 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun; 2150 assert(FTI.isAmbiguous && "no direct-initializer / function ambiguity"); 2151 2152 // If the return type is void there is no ambiguity. 2153 if (RT->isVoidType()) 2154 return; 2155 2156 // An initializer for a non-class type can have at most one argument. 2157 if (!RT->isRecordType() && FTI.NumArgs > 1) 2158 return; 2159 2160 // An initializer for a reference must have exactly one argument. 2161 if (RT->isReferenceType() && FTI.NumArgs != 1) 2162 return; 2163 2164 // Only warn if this declarator is declaring a function at block scope, and 2165 // doesn't have a storage class (such as 'extern') specified. 2166 if (!D.isFunctionDeclarator() || 2167 D.getFunctionDefinitionKind() != FDK_Declaration || 2168 !S.CurContext->isFunctionOrMethod() || 2169 D.getDeclSpec().getStorageClassSpecAsWritten() 2170 != DeclSpec::SCS_unspecified) 2171 return; 2172 2173 // Inside a condition, a direct initializer is not permitted. We allow one to 2174 // be parsed in order to give better diagnostics in condition parsing. 2175 if (D.getContext() == Declarator::ConditionContext) 2176 return; 2177 2178 SourceRange ParenRange(DeclType.Loc, DeclType.EndLoc); 2179 2180 S.Diag(DeclType.Loc, 2181 FTI.NumArgs ? diag::warn_parens_disambiguated_as_function_declaration 2182 : diag::warn_empty_parens_are_function_decl) 2183 << ParenRange; 2184 2185 // If the declaration looks like: 2186 // T var1, 2187 // f(); 2188 // and name lookup finds a function named 'f', then the ',' was 2189 // probably intended to be a ';'. 2190 if (!D.isFirstDeclarator() && D.getIdentifier()) { 2191 FullSourceLoc Comma(D.getCommaLoc(), S.SourceMgr); 2192 FullSourceLoc Name(D.getIdentifierLoc(), S.SourceMgr); 2193 if (Comma.getFileID() != Name.getFileID() || 2194 Comma.getSpellingLineNumber() != Name.getSpellingLineNumber()) { 2195 LookupResult Result(S, D.getIdentifier(), SourceLocation(), 2196 Sema::LookupOrdinaryName); 2197 if (S.LookupName(Result, S.getCurScope())) 2198 S.Diag(D.getCommaLoc(), diag::note_empty_parens_function_call) 2199 << FixItHint::CreateReplacement(D.getCommaLoc(), ";") 2200 << D.getIdentifier(); 2201 } 2202 } 2203 2204 if (FTI.NumArgs > 0) { 2205 // For a declaration with parameters, eg. "T var(T());", suggest adding parens 2206 // around the first parameter to turn the declaration into a variable 2207 // declaration. 2208 SourceRange Range = FTI.ArgInfo[0].Param->getSourceRange(); 2209 SourceLocation B = Range.getBegin(); 2210 SourceLocation E = S.PP.getLocForEndOfToken(Range.getEnd()); 2211 // FIXME: Maybe we should suggest adding braces instead of parens 2212 // in C++11 for classes that don't have an initializer_list constructor. 2213 S.Diag(B, diag::note_additional_parens_for_variable_declaration) 2214 << FixItHint::CreateInsertion(B, "(") 2215 << FixItHint::CreateInsertion(E, ")"); 2216 } else { 2217 // For a declaration without parameters, eg. "T var();", suggest replacing the 2218 // parens with an initializer to turn the declaration into a variable 2219 // declaration. 2220 const CXXRecordDecl *RD = RT->getAsCXXRecordDecl(); 2221 2222 // Empty parens mean value-initialization, and no parens mean 2223 // default initialization. These are equivalent if the default 2224 // constructor is user-provided or if zero-initialization is a 2225 // no-op. 2226 if (RD && RD->hasDefinition() && 2227 (RD->isEmpty() || RD->hasUserProvidedDefaultConstructor())) 2228 S.Diag(DeclType.Loc, diag::note_empty_parens_default_ctor) 2229 << FixItHint::CreateRemoval(ParenRange); 2230 else { 2231 std::string Init = S.getFixItZeroInitializerForType(RT); 2232 if (Init.empty() && S.LangOpts.CPlusPlus11) 2233 Init = "{}"; 2234 if (!Init.empty()) 2235 S.Diag(DeclType.Loc, diag::note_empty_parens_zero_initialize) 2236 << FixItHint::CreateReplacement(ParenRange, Init); 2237 } 2238 } 2239} 2240 2241static TypeSourceInfo *GetFullTypeForDeclarator(TypeProcessingState &state, 2242 QualType declSpecType, 2243 TypeSourceInfo *TInfo) { 2244 2245 QualType T = declSpecType; 2246 Declarator &D = state.getDeclarator(); 2247 Sema &S = state.getSema(); 2248 ASTContext &Context = S.Context; 2249 const LangOptions &LangOpts = S.getLangOpts(); 2250 2251 // The name we're declaring, if any. 2252 DeclarationName Name; 2253 if (D.getIdentifier()) 2254 Name = D.getIdentifier(); 2255 2256 // Does this declaration declare a typedef-name? 2257 bool IsTypedefName = 2258 D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef || 2259 D.getContext() == Declarator::AliasDeclContext || 2260 D.getContext() == Declarator::AliasTemplateContext; 2261 2262 // Does T refer to a function type with a cv-qualifier or a ref-qualifier? 2263 bool IsQualifiedFunction = T->isFunctionProtoType() && 2264 (T->castAs<FunctionProtoType>()->getTypeQuals() != 0 || 2265 T->castAs<FunctionProtoType>()->getRefQualifier() != RQ_None); 2266 2267 // Walk the DeclTypeInfo, building the recursive type as we go. 2268 // DeclTypeInfos are ordered from the identifier out, which is 2269 // opposite of what we want :). 2270 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 2271 unsigned chunkIndex = e - i - 1; 2272 state.setCurrentChunkIndex(chunkIndex); 2273 DeclaratorChunk &DeclType = D.getTypeObject(chunkIndex); 2274 if (IsQualifiedFunction) { 2275 checkQualifiedFunction(S, T, DeclType); 2276 IsQualifiedFunction = DeclType.Kind == DeclaratorChunk::Paren; 2277 } 2278 switch (DeclType.Kind) { 2279 case DeclaratorChunk::Paren: 2280 T = S.BuildParenType(T); 2281 break; 2282 case DeclaratorChunk::BlockPointer: 2283 // If blocks are disabled, emit an error. 2284 if (!LangOpts.Blocks) 2285 S.Diag(DeclType.Loc, diag::err_blocks_disable); 2286 2287 T = S.BuildBlockPointerType(T, D.getIdentifierLoc(), Name); 2288 if (DeclType.Cls.TypeQuals) 2289 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Cls.TypeQuals); 2290 break; 2291 case DeclaratorChunk::Pointer: 2292 // Verify that we're not building a pointer to pointer to function with 2293 // exception specification. 2294 if (LangOpts.CPlusPlus && S.CheckDistantExceptionSpec(T)) { 2295 S.Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 2296 D.setInvalidType(true); 2297 // Build the type anyway. 2298 } 2299 if (LangOpts.ObjC1 && T->getAs<ObjCObjectType>()) { 2300 T = Context.getObjCObjectPointerType(T); 2301 if (DeclType.Ptr.TypeQuals) 2302 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Ptr.TypeQuals); 2303 break; 2304 } 2305 T = S.BuildPointerType(T, DeclType.Loc, Name); 2306 if (DeclType.Ptr.TypeQuals) 2307 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Ptr.TypeQuals); 2308 2309 break; 2310 case DeclaratorChunk::Reference: { 2311 // Verify that we're not building a reference to pointer to function with 2312 // exception specification. 2313 if (LangOpts.CPlusPlus && S.CheckDistantExceptionSpec(T)) { 2314 S.Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 2315 D.setInvalidType(true); 2316 // Build the type anyway. 2317 } 2318 T = S.BuildReferenceType(T, DeclType.Ref.LValueRef, DeclType.Loc, Name); 2319 2320 Qualifiers Quals; 2321 if (DeclType.Ref.HasRestrict) 2322 T = S.BuildQualifiedType(T, DeclType.Loc, Qualifiers::Restrict); 2323 break; 2324 } 2325 case DeclaratorChunk::Array: { 2326 // Verify that we're not building an array of pointers to function with 2327 // exception specification. 2328 if (LangOpts.CPlusPlus && S.CheckDistantExceptionSpec(T)) { 2329 S.Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 2330 D.setInvalidType(true); 2331 // Build the type anyway. 2332 } 2333 DeclaratorChunk::ArrayTypeInfo &ATI = DeclType.Arr; 2334 Expr *ArraySize = static_cast<Expr*>(ATI.NumElts); 2335 ArrayType::ArraySizeModifier ASM; 2336 if (ATI.isStar) 2337 ASM = ArrayType::Star; 2338 else if (ATI.hasStatic) 2339 ASM = ArrayType::Static; 2340 else 2341 ASM = ArrayType::Normal; 2342 if (ASM == ArrayType::Star && !D.isPrototypeContext()) { 2343 // FIXME: This check isn't quite right: it allows star in prototypes 2344 // for function definitions, and disallows some edge cases detailed 2345 // in http://gcc.gnu.org/ml/gcc-patches/2009-02/msg00133.html 2346 S.Diag(DeclType.Loc, diag::err_array_star_outside_prototype); 2347 ASM = ArrayType::Normal; 2348 D.setInvalidType(true); 2349 } 2350 2351 // C99 6.7.5.2p1: The optional type qualifiers and the keyword static 2352 // shall appear only in a declaration of a function parameter with an 2353 // array type, ... 2354 if (ASM == ArrayType::Static || ATI.TypeQuals) { 2355 if (!(D.isPrototypeContext() || 2356 D.getContext() == Declarator::KNRTypeListContext)) { 2357 S.Diag(DeclType.Loc, diag::err_array_static_outside_prototype) << 2358 (ASM == ArrayType::Static ? "'static'" : "type qualifier"); 2359 // Remove the 'static' and the type qualifiers. 2360 if (ASM == ArrayType::Static) 2361 ASM = ArrayType::Normal; 2362 ATI.TypeQuals = 0; 2363 D.setInvalidType(true); 2364 } 2365 2366 // C99 6.7.5.2p1: ... and then only in the outermost array type 2367 // derivation. 2368 unsigned x = chunkIndex; 2369 while (x != 0) { 2370 // Walk outwards along the declarator chunks. 2371 x--; 2372 const DeclaratorChunk &DC = D.getTypeObject(x); 2373 switch (DC.Kind) { 2374 case DeclaratorChunk::Paren: 2375 continue; 2376 case DeclaratorChunk::Array: 2377 case DeclaratorChunk::Pointer: 2378 case DeclaratorChunk::Reference: 2379 case DeclaratorChunk::MemberPointer: 2380 S.Diag(DeclType.Loc, diag::err_array_static_not_outermost) << 2381 (ASM == ArrayType::Static ? "'static'" : "type qualifier"); 2382 if (ASM == ArrayType::Static) 2383 ASM = ArrayType::Normal; 2384 ATI.TypeQuals = 0; 2385 D.setInvalidType(true); 2386 break; 2387 case DeclaratorChunk::Function: 2388 case DeclaratorChunk::BlockPointer: 2389 // These are invalid anyway, so just ignore. 2390 break; 2391 } 2392 } 2393 } 2394 2395 T = S.BuildArrayType(T, ASM, ArraySize, ATI.TypeQuals, 2396 SourceRange(DeclType.Loc, DeclType.EndLoc), Name); 2397 break; 2398 } 2399 case DeclaratorChunk::Function: { 2400 // If the function declarator has a prototype (i.e. it is not () and 2401 // does not have a K&R-style identifier list), then the arguments are part 2402 // of the type, otherwise the argument list is (). 2403 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun; 2404 IsQualifiedFunction = FTI.TypeQuals || FTI.hasRefQualifier(); 2405 2406 // Check for auto functions and trailing return type and adjust the 2407 // return type accordingly. 2408 if (!D.isInvalidType()) { 2409 // trailing-return-type is only required if we're declaring a function, 2410 // and not, for instance, a pointer to a function. 2411 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto && 2412 !FTI.hasTrailingReturnType() && chunkIndex == 0) { 2413 S.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 2414 diag::err_auto_missing_trailing_return); 2415 T = Context.IntTy; 2416 D.setInvalidType(true); 2417 } else if (FTI.hasTrailingReturnType()) { 2418 // T must be exactly 'auto' at this point. See CWG issue 681. 2419 if (isa<ParenType>(T)) { 2420 S.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 2421 diag::err_trailing_return_in_parens) 2422 << T << D.getDeclSpec().getSourceRange(); 2423 D.setInvalidType(true); 2424 } else if (D.getContext() != Declarator::LambdaExprContext && 2425 (T.hasQualifiers() || !isa<AutoType>(T))) { 2426 S.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 2427 diag::err_trailing_return_without_auto) 2428 << T << D.getDeclSpec().getSourceRange(); 2429 D.setInvalidType(true); 2430 } 2431 T = S.GetTypeFromParser(FTI.getTrailingReturnType(), &TInfo); 2432 if (T.isNull()) { 2433 // An error occurred parsing the trailing return type. 2434 T = Context.IntTy; 2435 D.setInvalidType(true); 2436 } 2437 } 2438 } 2439 2440 // C99 6.7.5.3p1: The return type may not be a function or array type. 2441 // For conversion functions, we'll diagnose this particular error later. 2442 if ((T->isArrayType() || T->isFunctionType()) && 2443 (D.getName().getKind() != UnqualifiedId::IK_ConversionFunctionId)) { 2444 unsigned diagID = diag::err_func_returning_array_function; 2445 // Last processing chunk in block context means this function chunk 2446 // represents the block. 2447 if (chunkIndex == 0 && 2448 D.getContext() == Declarator::BlockLiteralContext) 2449 diagID = diag::err_block_returning_array_function; 2450 S.Diag(DeclType.Loc, diagID) << T->isFunctionType() << T; 2451 T = Context.IntTy; 2452 D.setInvalidType(true); 2453 } 2454 2455 // Do not allow returning half FP value. 2456 // FIXME: This really should be in BuildFunctionType. 2457 if (T->isHalfType()) { 2458 if (S.getLangOpts().OpenCL) { 2459 if (!S.getOpenCLOptions().cl_khr_fp16) { 2460 S.Diag(D.getIdentifierLoc(), diag::err_opencl_half_return) << T; 2461 D.setInvalidType(true); 2462 } 2463 } else { 2464 S.Diag(D.getIdentifierLoc(), 2465 diag::err_parameters_retval_cannot_have_fp16_type) << 1; 2466 D.setInvalidType(true); 2467 } 2468 } 2469 2470 // cv-qualifiers on return types are pointless except when the type is a 2471 // class type in C++. 2472 if (isa<PointerType>(T) && T.getLocalCVRQualifiers() && 2473 (D.getName().getKind() != UnqualifiedId::IK_ConversionFunctionId) && 2474 (!LangOpts.CPlusPlus || !T->isDependentType())) { 2475 assert(chunkIndex + 1 < e && "No DeclaratorChunk for the return type?"); 2476 DeclaratorChunk ReturnTypeChunk = D.getTypeObject(chunkIndex + 1); 2477 assert(ReturnTypeChunk.Kind == DeclaratorChunk::Pointer); 2478 2479 DeclaratorChunk::PointerTypeInfo &PTI = ReturnTypeChunk.Ptr; 2480 2481 DiagnoseIgnoredQualifiers(PTI.TypeQuals, 2482 SourceLocation::getFromRawEncoding(PTI.ConstQualLoc), 2483 SourceLocation::getFromRawEncoding(PTI.VolatileQualLoc), 2484 SourceLocation::getFromRawEncoding(PTI.RestrictQualLoc), 2485 S); 2486 2487 } else if (T.getCVRQualifiers() && D.getDeclSpec().getTypeQualifiers() && 2488 (!LangOpts.CPlusPlus || 2489 (!T->isDependentType() && !T->isRecordType()))) { 2490 2491 DiagnoseIgnoredQualifiers(D.getDeclSpec().getTypeQualifiers(), 2492 D.getDeclSpec().getConstSpecLoc(), 2493 D.getDeclSpec().getVolatileSpecLoc(), 2494 D.getDeclSpec().getRestrictSpecLoc(), 2495 S); 2496 } 2497 2498 // Objective-C ARC ownership qualifiers are ignored on the function 2499 // return type (by type canonicalization). Complain if this attribute 2500 // was written here. 2501 if (T.getQualifiers().hasObjCLifetime()) { 2502 SourceLocation AttrLoc; 2503 if (chunkIndex + 1 < D.getNumTypeObjects()) { 2504 DeclaratorChunk ReturnTypeChunk = D.getTypeObject(chunkIndex + 1); 2505 for (const AttributeList *Attr = ReturnTypeChunk.getAttrs(); 2506 Attr; Attr = Attr->getNext()) { 2507 if (Attr->getKind() == AttributeList::AT_ObjCOwnership) { 2508 AttrLoc = Attr->getLoc(); 2509 break; 2510 } 2511 } 2512 } 2513 if (AttrLoc.isInvalid()) { 2514 for (const AttributeList *Attr 2515 = D.getDeclSpec().getAttributes().getList(); 2516 Attr; Attr = Attr->getNext()) { 2517 if (Attr->getKind() == AttributeList::AT_ObjCOwnership) { 2518 AttrLoc = Attr->getLoc(); 2519 break; 2520 } 2521 } 2522 } 2523 2524 if (AttrLoc.isValid()) { 2525 // The ownership attributes are almost always written via 2526 // the predefined 2527 // __strong/__weak/__autoreleasing/__unsafe_unretained. 2528 if (AttrLoc.isMacroID()) 2529 AttrLoc = S.SourceMgr.getImmediateExpansionRange(AttrLoc).first; 2530 2531 S.Diag(AttrLoc, diag::warn_arc_lifetime_result_type) 2532 << T.getQualifiers().getObjCLifetime(); 2533 } 2534 } 2535 2536 if (LangOpts.CPlusPlus && D.getDeclSpec().isTypeSpecOwned()) { 2537 // C++ [dcl.fct]p6: 2538 // Types shall not be defined in return or parameter types. 2539 TagDecl *Tag = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 2540 if (Tag->isCompleteDefinition()) 2541 S.Diag(Tag->getLocation(), diag::err_type_defined_in_result_type) 2542 << Context.getTypeDeclType(Tag); 2543 } 2544 2545 // Exception specs are not allowed in typedefs. Complain, but add it 2546 // anyway. 2547 if (IsTypedefName && FTI.getExceptionSpecType()) 2548 S.Diag(FTI.getExceptionSpecLoc(), diag::err_exception_spec_in_typedef) 2549 << (D.getContext() == Declarator::AliasDeclContext || 2550 D.getContext() == Declarator::AliasTemplateContext); 2551 2552 // If we see "T var();" or "T var(T());" at block scope, it is probably 2553 // an attempt to initialize a variable, not a function declaration. 2554 if (FTI.isAmbiguous) 2555 warnAboutAmbiguousFunction(S, D, DeclType, T); 2556 2557 if (!FTI.NumArgs && !FTI.isVariadic && !LangOpts.CPlusPlus) { 2558 // Simple void foo(), where the incoming T is the result type. 2559 T = Context.getFunctionNoProtoType(T); 2560 } else { 2561 // We allow a zero-parameter variadic function in C if the 2562 // function is marked with the "overloadable" attribute. Scan 2563 // for this attribute now. 2564 if (!FTI.NumArgs && FTI.isVariadic && !LangOpts.CPlusPlus) { 2565 bool Overloadable = false; 2566 for (const AttributeList *Attrs = D.getAttributes(); 2567 Attrs; Attrs = Attrs->getNext()) { 2568 if (Attrs->getKind() == AttributeList::AT_Overloadable) { 2569 Overloadable = true; 2570 break; 2571 } 2572 } 2573 2574 if (!Overloadable) 2575 S.Diag(FTI.getEllipsisLoc(), diag::err_ellipsis_first_arg); 2576 } 2577 2578 if (FTI.NumArgs && FTI.ArgInfo[0].Param == 0) { 2579 // C99 6.7.5.3p3: Reject int(x,y,z) when it's not a function 2580 // definition. 2581 S.Diag(FTI.ArgInfo[0].IdentLoc, diag::err_ident_list_in_fn_declaration); 2582 D.setInvalidType(true); 2583 break; 2584 } 2585 2586 FunctionProtoType::ExtProtoInfo EPI; 2587 EPI.Variadic = FTI.isVariadic; 2588 EPI.HasTrailingReturn = FTI.hasTrailingReturnType(); 2589 EPI.TypeQuals = FTI.TypeQuals; 2590 EPI.RefQualifier = !FTI.hasRefQualifier()? RQ_None 2591 : FTI.RefQualifierIsLValueRef? RQ_LValue 2592 : RQ_RValue; 2593 2594 // Otherwise, we have a function with an argument list that is 2595 // potentially variadic. 2596 SmallVector<QualType, 16> ArgTys; 2597 ArgTys.reserve(FTI.NumArgs); 2598 2599 SmallVector<bool, 16> ConsumedArguments; 2600 ConsumedArguments.reserve(FTI.NumArgs); 2601 bool HasAnyConsumedArguments = false; 2602 2603 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 2604 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 2605 QualType ArgTy = Param->getType(); 2606 assert(!ArgTy.isNull() && "Couldn't parse type?"); 2607 2608 // Adjust the parameter type. 2609 assert((ArgTy == Context.getAdjustedParameterType(ArgTy)) && 2610 "Unadjusted type?"); 2611 2612 // Look for 'void'. void is allowed only as a single argument to a 2613 // function with no other parameters (C99 6.7.5.3p10). We record 2614 // int(void) as a FunctionProtoType with an empty argument list. 2615 if (ArgTy->isVoidType()) { 2616 // If this is something like 'float(int, void)', reject it. 'void' 2617 // is an incomplete type (C99 6.2.5p19) and function decls cannot 2618 // have arguments of incomplete type. 2619 if (FTI.NumArgs != 1 || FTI.isVariadic) { 2620 S.Diag(DeclType.Loc, diag::err_void_only_param); 2621 ArgTy = Context.IntTy; 2622 Param->setType(ArgTy); 2623 } else if (FTI.ArgInfo[i].Ident) { 2624 // Reject, but continue to parse 'int(void abc)'. 2625 S.Diag(FTI.ArgInfo[i].IdentLoc, 2626 diag::err_param_with_void_type); 2627 ArgTy = Context.IntTy; 2628 Param->setType(ArgTy); 2629 } else { 2630 // Reject, but continue to parse 'float(const void)'. 2631 if (ArgTy.hasQualifiers()) 2632 S.Diag(DeclType.Loc, diag::err_void_param_qualified); 2633 2634 // Do not add 'void' to the ArgTys list. 2635 break; 2636 } 2637 } else if (ArgTy->isHalfType()) { 2638 // Disallow half FP arguments. 2639 // FIXME: This really should be in BuildFunctionType. 2640 if (S.getLangOpts().OpenCL) { 2641 if (!S.getOpenCLOptions().cl_khr_fp16) { 2642 S.Diag(Param->getLocation(), 2643 diag::err_opencl_half_argument) << ArgTy; 2644 D.setInvalidType(); 2645 Param->setInvalidDecl(); 2646 } 2647 } else { 2648 S.Diag(Param->getLocation(), 2649 diag::err_parameters_retval_cannot_have_fp16_type) << 0; 2650 D.setInvalidType(); 2651 } 2652 } else if (!FTI.hasPrototype) { 2653 if (ArgTy->isPromotableIntegerType()) { 2654 ArgTy = Context.getPromotedIntegerType(ArgTy); 2655 Param->setKNRPromoted(true); 2656 } else if (const BuiltinType* BTy = ArgTy->getAs<BuiltinType>()) { 2657 if (BTy->getKind() == BuiltinType::Float) { 2658 ArgTy = Context.DoubleTy; 2659 Param->setKNRPromoted(true); 2660 } 2661 } 2662 } 2663 2664 if (LangOpts.ObjCAutoRefCount) { 2665 bool Consumed = Param->hasAttr<NSConsumedAttr>(); 2666 ConsumedArguments.push_back(Consumed); 2667 HasAnyConsumedArguments |= Consumed; 2668 } 2669 2670 ArgTys.push_back(ArgTy); 2671 } 2672 2673 if (HasAnyConsumedArguments) 2674 EPI.ConsumedArguments = ConsumedArguments.data(); 2675 2676 SmallVector<QualType, 4> Exceptions; 2677 SmallVector<ParsedType, 2> DynamicExceptions; 2678 SmallVector<SourceRange, 2> DynamicExceptionRanges; 2679 Expr *NoexceptExpr = 0; 2680 2681 if (FTI.getExceptionSpecType() == EST_Dynamic) { 2682 // FIXME: It's rather inefficient to have to split into two vectors 2683 // here. 2684 unsigned N = FTI.NumExceptions; 2685 DynamicExceptions.reserve(N); 2686 DynamicExceptionRanges.reserve(N); 2687 for (unsigned I = 0; I != N; ++I) { 2688 DynamicExceptions.push_back(FTI.Exceptions[I].Ty); 2689 DynamicExceptionRanges.push_back(FTI.Exceptions[I].Range); 2690 } 2691 } else if (FTI.getExceptionSpecType() == EST_ComputedNoexcept) { 2692 NoexceptExpr = FTI.NoexceptExpr; 2693 } 2694 2695 S.checkExceptionSpecification(FTI.getExceptionSpecType(), 2696 DynamicExceptions, 2697 DynamicExceptionRanges, 2698 NoexceptExpr, 2699 Exceptions, 2700 EPI); 2701 2702 T = Context.getFunctionType(T, ArgTys.data(), ArgTys.size(), EPI); 2703 } 2704 2705 break; 2706 } 2707 case DeclaratorChunk::MemberPointer: 2708 // The scope spec must refer to a class, or be dependent. 2709 CXXScopeSpec &SS = DeclType.Mem.Scope(); 2710 QualType ClsType; 2711 if (SS.isInvalid()) { 2712 // Avoid emitting extra errors if we already errored on the scope. 2713 D.setInvalidType(true); 2714 } else if (S.isDependentScopeSpecifier(SS) || 2715 dyn_cast_or_null<CXXRecordDecl>(S.computeDeclContext(SS))) { 2716 NestedNameSpecifier *NNS 2717 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 2718 NestedNameSpecifier *NNSPrefix = NNS->getPrefix(); 2719 switch (NNS->getKind()) { 2720 case NestedNameSpecifier::Identifier: 2721 ClsType = Context.getDependentNameType(ETK_None, NNSPrefix, 2722 NNS->getAsIdentifier()); 2723 break; 2724 2725 case NestedNameSpecifier::Namespace: 2726 case NestedNameSpecifier::NamespaceAlias: 2727 case NestedNameSpecifier::Global: 2728 llvm_unreachable("Nested-name-specifier must name a type"); 2729 2730 case NestedNameSpecifier::TypeSpec: 2731 case NestedNameSpecifier::TypeSpecWithTemplate: 2732 ClsType = QualType(NNS->getAsType(), 0); 2733 // Note: if the NNS has a prefix and ClsType is a nondependent 2734 // TemplateSpecializationType, then the NNS prefix is NOT included 2735 // in ClsType; hence we wrap ClsType into an ElaboratedType. 2736 // NOTE: in particular, no wrap occurs if ClsType already is an 2737 // Elaborated, DependentName, or DependentTemplateSpecialization. 2738 if (NNSPrefix && isa<TemplateSpecializationType>(NNS->getAsType())) 2739 ClsType = Context.getElaboratedType(ETK_None, NNSPrefix, ClsType); 2740 break; 2741 } 2742 } else { 2743 S.Diag(DeclType.Mem.Scope().getBeginLoc(), 2744 diag::err_illegal_decl_mempointer_in_nonclass) 2745 << (D.getIdentifier() ? D.getIdentifier()->getName() : "type name") 2746 << DeclType.Mem.Scope().getRange(); 2747 D.setInvalidType(true); 2748 } 2749 2750 if (!ClsType.isNull()) 2751 T = S.BuildMemberPointerType(T, ClsType, DeclType.Loc, D.getIdentifier()); 2752 if (T.isNull()) { 2753 T = Context.IntTy; 2754 D.setInvalidType(true); 2755 } else if (DeclType.Mem.TypeQuals) { 2756 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Mem.TypeQuals); 2757 } 2758 break; 2759 } 2760 2761 if (T.isNull()) { 2762 D.setInvalidType(true); 2763 T = Context.IntTy; 2764 } 2765 2766 // See if there are any attributes on this declarator chunk. 2767 if (AttributeList *attrs = const_cast<AttributeList*>(DeclType.getAttrs())) 2768 processTypeAttrs(state, T, TAL_DeclChunk, attrs); 2769 } 2770 2771 if (LangOpts.CPlusPlus && T->isFunctionType()) { 2772 const FunctionProtoType *FnTy = T->getAs<FunctionProtoType>(); 2773 assert(FnTy && "Why oh why is there not a FunctionProtoType here?"); 2774 2775 // C++ 8.3.5p4: 2776 // A cv-qualifier-seq shall only be part of the function type 2777 // for a nonstatic member function, the function type to which a pointer 2778 // to member refers, or the top-level function type of a function typedef 2779 // declaration. 2780 // 2781 // Core issue 547 also allows cv-qualifiers on function types that are 2782 // top-level template type arguments. 2783 bool FreeFunction; 2784 if (!D.getCXXScopeSpec().isSet()) { 2785 FreeFunction = ((D.getContext() != Declarator::MemberContext && 2786 D.getContext() != Declarator::LambdaExprContext) || 2787 D.getDeclSpec().isFriendSpecified()); 2788 } else { 2789 DeclContext *DC = S.computeDeclContext(D.getCXXScopeSpec()); 2790 FreeFunction = (DC && !DC->isRecord()); 2791 } 2792 2793 // C++11 [dcl.fct]p6 (w/DR1417): 2794 // An attempt to specify a function type with a cv-qualifier-seq or a 2795 // ref-qualifier (including by typedef-name) is ill-formed unless it is: 2796 // - the function type for a non-static member function, 2797 // - the function type to which a pointer to member refers, 2798 // - the top-level function type of a function typedef declaration or 2799 // alias-declaration, 2800 // - the type-id in the default argument of a type-parameter, or 2801 // - the type-id of a template-argument for a type-parameter 2802 if (IsQualifiedFunction && 2803 !(!FreeFunction && 2804 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) && 2805 !IsTypedefName && 2806 D.getContext() != Declarator::TemplateTypeArgContext) { 2807 SourceLocation Loc = D.getLocStart(); 2808 SourceRange RemovalRange; 2809 unsigned I; 2810 if (D.isFunctionDeclarator(I)) { 2811 SmallVector<SourceLocation, 4> RemovalLocs; 2812 const DeclaratorChunk &Chunk = D.getTypeObject(I); 2813 assert(Chunk.Kind == DeclaratorChunk::Function); 2814 if (Chunk.Fun.hasRefQualifier()) 2815 RemovalLocs.push_back(Chunk.Fun.getRefQualifierLoc()); 2816 if (Chunk.Fun.TypeQuals & Qualifiers::Const) 2817 RemovalLocs.push_back(Chunk.Fun.getConstQualifierLoc()); 2818 if (Chunk.Fun.TypeQuals & Qualifiers::Volatile) 2819 RemovalLocs.push_back(Chunk.Fun.getVolatileQualifierLoc()); 2820 // FIXME: We do not track the location of the __restrict qualifier. 2821 //if (Chunk.Fun.TypeQuals & Qualifiers::Restrict) 2822 // RemovalLocs.push_back(Chunk.Fun.getRestrictQualifierLoc()); 2823 if (!RemovalLocs.empty()) { 2824 std::sort(RemovalLocs.begin(), RemovalLocs.end(), 2825 BeforeThanCompare<SourceLocation>(S.getSourceManager())); 2826 RemovalRange = SourceRange(RemovalLocs.front(), RemovalLocs.back()); 2827 Loc = RemovalLocs.front(); 2828 } 2829 } 2830 2831 S.Diag(Loc, diag::err_invalid_qualified_function_type) 2832 << FreeFunction << D.isFunctionDeclarator() << T 2833 << getFunctionQualifiersAsString(FnTy) 2834 << FixItHint::CreateRemoval(RemovalRange); 2835 2836 // Strip the cv-qualifiers and ref-qualifiers from the type. 2837 FunctionProtoType::ExtProtoInfo EPI = FnTy->getExtProtoInfo(); 2838 EPI.TypeQuals = 0; 2839 EPI.RefQualifier = RQ_None; 2840 2841 T = Context.getFunctionType(FnTy->getResultType(), 2842 FnTy->arg_type_begin(), 2843 FnTy->getNumArgs(), EPI); 2844 // Rebuild any parens around the identifier in the function type. 2845 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 2846 if (D.getTypeObject(i).Kind != DeclaratorChunk::Paren) 2847 break; 2848 T = S.BuildParenType(T); 2849 } 2850 } 2851 } 2852 2853 // Apply any undistributed attributes from the declarator. 2854 if (!T.isNull()) 2855 if (AttributeList *attrs = D.getAttributes()) 2856 processTypeAttrs(state, T, TAL_DeclName, attrs); 2857 2858 // Diagnose any ignored type attributes. 2859 if (!T.isNull()) state.diagnoseIgnoredTypeAttrs(T); 2860 2861 // C++0x [dcl.constexpr]p9: 2862 // A constexpr specifier used in an object declaration declares the object 2863 // as const. 2864 if (D.getDeclSpec().isConstexprSpecified() && T->isObjectType()) { 2865 T.addConst(); 2866 } 2867 2868 // If there was an ellipsis in the declarator, the declaration declares a 2869 // parameter pack whose type may be a pack expansion type. 2870 if (D.hasEllipsis() && !T.isNull()) { 2871 // C++0x [dcl.fct]p13: 2872 // A declarator-id or abstract-declarator containing an ellipsis shall 2873 // only be used in a parameter-declaration. Such a parameter-declaration 2874 // is a parameter pack (14.5.3). [...] 2875 switch (D.getContext()) { 2876 case Declarator::PrototypeContext: 2877 // C++0x [dcl.fct]p13: 2878 // [...] When it is part of a parameter-declaration-clause, the 2879 // parameter pack is a function parameter pack (14.5.3). The type T 2880 // of the declarator-id of the function parameter pack shall contain 2881 // a template parameter pack; each template parameter pack in T is 2882 // expanded by the function parameter pack. 2883 // 2884 // We represent function parameter packs as function parameters whose 2885 // type is a pack expansion. 2886 if (!T->containsUnexpandedParameterPack()) { 2887 S.Diag(D.getEllipsisLoc(), 2888 diag::err_function_parameter_pack_without_parameter_packs) 2889 << T << D.getSourceRange(); 2890 D.setEllipsisLoc(SourceLocation()); 2891 } else { 2892 T = Context.getPackExpansionType(T, llvm::Optional<unsigned>()); 2893 } 2894 break; 2895 2896 case Declarator::TemplateParamContext: 2897 // C++0x [temp.param]p15: 2898 // If a template-parameter is a [...] is a parameter-declaration that 2899 // declares a parameter pack (8.3.5), then the template-parameter is a 2900 // template parameter pack (14.5.3). 2901 // 2902 // Note: core issue 778 clarifies that, if there are any unexpanded 2903 // parameter packs in the type of the non-type template parameter, then 2904 // it expands those parameter packs. 2905 if (T->containsUnexpandedParameterPack()) 2906 T = Context.getPackExpansionType(T, llvm::Optional<unsigned>()); 2907 else 2908 S.Diag(D.getEllipsisLoc(), 2909 LangOpts.CPlusPlus11 2910 ? diag::warn_cxx98_compat_variadic_templates 2911 : diag::ext_variadic_templates); 2912 break; 2913 2914 case Declarator::FileContext: 2915 case Declarator::KNRTypeListContext: 2916 case Declarator::ObjCParameterContext: // FIXME: special diagnostic here? 2917 case Declarator::ObjCResultContext: // FIXME: special diagnostic here? 2918 case Declarator::TypeNameContext: 2919 case Declarator::CXXNewContext: 2920 case Declarator::AliasDeclContext: 2921 case Declarator::AliasTemplateContext: 2922 case Declarator::MemberContext: 2923 case Declarator::BlockContext: 2924 case Declarator::ForContext: 2925 case Declarator::ConditionContext: 2926 case Declarator::CXXCatchContext: 2927 case Declarator::ObjCCatchContext: 2928 case Declarator::BlockLiteralContext: 2929 case Declarator::LambdaExprContext: 2930 case Declarator::TrailingReturnContext: 2931 case Declarator::TemplateTypeArgContext: 2932 // FIXME: We may want to allow parameter packs in block-literal contexts 2933 // in the future. 2934 S.Diag(D.getEllipsisLoc(), diag::err_ellipsis_in_declarator_not_parameter); 2935 D.setEllipsisLoc(SourceLocation()); 2936 break; 2937 } 2938 } 2939 2940 if (T.isNull()) 2941 return Context.getNullTypeSourceInfo(); 2942 else if (D.isInvalidType()) 2943 return Context.getTrivialTypeSourceInfo(T); 2944 2945 return S.GetTypeSourceInfoForDeclarator(D, T, TInfo); 2946} 2947 2948/// GetTypeForDeclarator - Convert the type for the specified 2949/// declarator to Type instances. 2950/// 2951/// The result of this call will never be null, but the associated 2952/// type may be a null type if there's an unrecoverable error. 2953TypeSourceInfo *Sema::GetTypeForDeclarator(Declarator &D, Scope *S) { 2954 // Determine the type of the declarator. Not all forms of declarator 2955 // have a type. 2956 2957 TypeProcessingState state(*this, D); 2958 2959 TypeSourceInfo *ReturnTypeInfo = 0; 2960 QualType T = GetDeclSpecTypeForDeclarator(state, ReturnTypeInfo); 2961 if (T.isNull()) 2962 return Context.getNullTypeSourceInfo(); 2963 2964 if (D.isPrototypeContext() && getLangOpts().ObjCAutoRefCount) 2965 inferARCWriteback(state, T); 2966 2967 return GetFullTypeForDeclarator(state, T, ReturnTypeInfo); 2968} 2969 2970static void transferARCOwnershipToDeclSpec(Sema &S, 2971 QualType &declSpecTy, 2972 Qualifiers::ObjCLifetime ownership) { 2973 if (declSpecTy->isObjCRetainableType() && 2974 declSpecTy.getObjCLifetime() == Qualifiers::OCL_None) { 2975 Qualifiers qs; 2976 qs.addObjCLifetime(ownership); 2977 declSpecTy = S.Context.getQualifiedType(declSpecTy, qs); 2978 } 2979} 2980 2981static void transferARCOwnershipToDeclaratorChunk(TypeProcessingState &state, 2982 Qualifiers::ObjCLifetime ownership, 2983 unsigned chunkIndex) { 2984 Sema &S = state.getSema(); 2985 Declarator &D = state.getDeclarator(); 2986 2987 // Look for an explicit lifetime attribute. 2988 DeclaratorChunk &chunk = D.getTypeObject(chunkIndex); 2989 for (const AttributeList *attr = chunk.getAttrs(); attr; 2990 attr = attr->getNext()) 2991 if (attr->getKind() == AttributeList::AT_ObjCOwnership) 2992 return; 2993 2994 const char *attrStr = 0; 2995 switch (ownership) { 2996 case Qualifiers::OCL_None: llvm_unreachable("no ownership!"); 2997 case Qualifiers::OCL_ExplicitNone: attrStr = "none"; break; 2998 case Qualifiers::OCL_Strong: attrStr = "strong"; break; 2999 case Qualifiers::OCL_Weak: attrStr = "weak"; break; 3000 case Qualifiers::OCL_Autoreleasing: attrStr = "autoreleasing"; break; 3001 } 3002 3003 // If there wasn't one, add one (with an invalid source location 3004 // so that we don't make an AttributedType for it). 3005 AttributeList *attr = D.getAttributePool() 3006 .create(&S.Context.Idents.get("objc_ownership"), SourceLocation(), 3007 /*scope*/ 0, SourceLocation(), 3008 &S.Context.Idents.get(attrStr), SourceLocation(), 3009 /*args*/ 0, 0, AttributeList::AS_GNU); 3010 spliceAttrIntoList(*attr, chunk.getAttrListRef()); 3011 3012 // TODO: mark whether we did this inference? 3013} 3014 3015/// \brief Used for transferring ownership in casts resulting in l-values. 3016static void transferARCOwnership(TypeProcessingState &state, 3017 QualType &declSpecTy, 3018 Qualifiers::ObjCLifetime ownership) { 3019 Sema &S = state.getSema(); 3020 Declarator &D = state.getDeclarator(); 3021 3022 int inner = -1; 3023 bool hasIndirection = false; 3024 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 3025 DeclaratorChunk &chunk = D.getTypeObject(i); 3026 switch (chunk.Kind) { 3027 case DeclaratorChunk::Paren: 3028 // Ignore parens. 3029 break; 3030 3031 case DeclaratorChunk::Array: 3032 case DeclaratorChunk::Reference: 3033 case DeclaratorChunk::Pointer: 3034 if (inner != -1) 3035 hasIndirection = true; 3036 inner = i; 3037 break; 3038 3039 case DeclaratorChunk::BlockPointer: 3040 if (inner != -1) 3041 transferARCOwnershipToDeclaratorChunk(state, ownership, i); 3042 return; 3043 3044 case DeclaratorChunk::Function: 3045 case DeclaratorChunk::MemberPointer: 3046 return; 3047 } 3048 } 3049 3050 if (inner == -1) 3051 return; 3052 3053 DeclaratorChunk &chunk = D.getTypeObject(inner); 3054 if (chunk.Kind == DeclaratorChunk::Pointer) { 3055 if (declSpecTy->isObjCRetainableType()) 3056 return transferARCOwnershipToDeclSpec(S, declSpecTy, ownership); 3057 if (declSpecTy->isObjCObjectType() && hasIndirection) 3058 return transferARCOwnershipToDeclaratorChunk(state, ownership, inner); 3059 } else { 3060 assert(chunk.Kind == DeclaratorChunk::Array || 3061 chunk.Kind == DeclaratorChunk::Reference); 3062 return transferARCOwnershipToDeclSpec(S, declSpecTy, ownership); 3063 } 3064} 3065 3066TypeSourceInfo *Sema::GetTypeForDeclaratorCast(Declarator &D, QualType FromTy) { 3067 TypeProcessingState state(*this, D); 3068 3069 TypeSourceInfo *ReturnTypeInfo = 0; 3070 QualType declSpecTy = GetDeclSpecTypeForDeclarator(state, ReturnTypeInfo); 3071 if (declSpecTy.isNull()) 3072 return Context.getNullTypeSourceInfo(); 3073 3074 if (getLangOpts().ObjCAutoRefCount) { 3075 Qualifiers::ObjCLifetime ownership = Context.getInnerObjCOwnership(FromTy); 3076 if (ownership != Qualifiers::OCL_None) 3077 transferARCOwnership(state, declSpecTy, ownership); 3078 } 3079 3080 return GetFullTypeForDeclarator(state, declSpecTy, ReturnTypeInfo); 3081} 3082 3083/// Map an AttributedType::Kind to an AttributeList::Kind. 3084static AttributeList::Kind getAttrListKind(AttributedType::Kind kind) { 3085 switch (kind) { 3086 case AttributedType::attr_address_space: 3087 return AttributeList::AT_AddressSpace; 3088 case AttributedType::attr_regparm: 3089 return AttributeList::AT_Regparm; 3090 case AttributedType::attr_vector_size: 3091 return AttributeList::AT_VectorSize; 3092 case AttributedType::attr_neon_vector_type: 3093 return AttributeList::AT_NeonVectorType; 3094 case AttributedType::attr_neon_polyvector_type: 3095 return AttributeList::AT_NeonPolyVectorType; 3096 case AttributedType::attr_objc_gc: 3097 return AttributeList::AT_ObjCGC; 3098 case AttributedType::attr_objc_ownership: 3099 return AttributeList::AT_ObjCOwnership; 3100 case AttributedType::attr_noreturn: 3101 return AttributeList::AT_NoReturn; 3102 case AttributedType::attr_cdecl: 3103 return AttributeList::AT_CDecl; 3104 case AttributedType::attr_fastcall: 3105 return AttributeList::AT_FastCall; 3106 case AttributedType::attr_stdcall: 3107 return AttributeList::AT_StdCall; 3108 case AttributedType::attr_thiscall: 3109 return AttributeList::AT_ThisCall; 3110 case AttributedType::attr_pascal: 3111 return AttributeList::AT_Pascal; 3112 case AttributedType::attr_pcs: 3113 return AttributeList::AT_Pcs; 3114 case AttributedType::attr_pnaclcall: 3115 return AttributeList::AT_PnaclCall; 3116 case AttributedType::attr_inteloclbicc: 3117 return AttributeList::AT_IntelOclBicc; 3118 } 3119 llvm_unreachable("unexpected attribute kind!"); 3120} 3121 3122static void fillAttributedTypeLoc(AttributedTypeLoc TL, 3123 const AttributeList *attrs) { 3124 AttributedType::Kind kind = TL.getAttrKind(); 3125 3126 assert(attrs && "no type attributes in the expected location!"); 3127 AttributeList::Kind parsedKind = getAttrListKind(kind); 3128 while (attrs->getKind() != parsedKind) { 3129 attrs = attrs->getNext(); 3130 assert(attrs && "no matching attribute in expected location!"); 3131 } 3132 3133 TL.setAttrNameLoc(attrs->getLoc()); 3134 if (TL.hasAttrExprOperand()) 3135 TL.setAttrExprOperand(attrs->getArg(0)); 3136 else if (TL.hasAttrEnumOperand()) 3137 TL.setAttrEnumOperandLoc(attrs->getParameterLoc()); 3138 3139 // FIXME: preserve this information to here. 3140 if (TL.hasAttrOperand()) 3141 TL.setAttrOperandParensRange(SourceRange()); 3142} 3143 3144namespace { 3145 class TypeSpecLocFiller : public TypeLocVisitor<TypeSpecLocFiller> { 3146 ASTContext &Context; 3147 const DeclSpec &DS; 3148 3149 public: 3150 TypeSpecLocFiller(ASTContext &Context, const DeclSpec &DS) 3151 : Context(Context), DS(DS) {} 3152 3153 void VisitAttributedTypeLoc(AttributedTypeLoc TL) { 3154 fillAttributedTypeLoc(TL, DS.getAttributes().getList()); 3155 Visit(TL.getModifiedLoc()); 3156 } 3157 void VisitQualifiedTypeLoc(QualifiedTypeLoc TL) { 3158 Visit(TL.getUnqualifiedLoc()); 3159 } 3160 void VisitTypedefTypeLoc(TypedefTypeLoc TL) { 3161 TL.setNameLoc(DS.getTypeSpecTypeLoc()); 3162 } 3163 void VisitObjCInterfaceTypeLoc(ObjCInterfaceTypeLoc TL) { 3164 TL.setNameLoc(DS.getTypeSpecTypeLoc()); 3165 // FIXME. We should have DS.getTypeSpecTypeEndLoc(). But, it requires 3166 // addition field. What we have is good enough for dispay of location 3167 // of 'fixit' on interface name. 3168 TL.setNameEndLoc(DS.getLocEnd()); 3169 } 3170 void VisitObjCObjectTypeLoc(ObjCObjectTypeLoc TL) { 3171 // Handle the base type, which might not have been written explicitly. 3172 if (DS.getTypeSpecType() == DeclSpec::TST_unspecified) { 3173 TL.setHasBaseTypeAsWritten(false); 3174 TL.getBaseLoc().initialize(Context, SourceLocation()); 3175 } else { 3176 TL.setHasBaseTypeAsWritten(true); 3177 Visit(TL.getBaseLoc()); 3178 } 3179 3180 // Protocol qualifiers. 3181 if (DS.getProtocolQualifiers()) { 3182 assert(TL.getNumProtocols() > 0); 3183 assert(TL.getNumProtocols() == DS.getNumProtocolQualifiers()); 3184 TL.setLAngleLoc(DS.getProtocolLAngleLoc()); 3185 TL.setRAngleLoc(DS.getSourceRange().getEnd()); 3186 for (unsigned i = 0, e = DS.getNumProtocolQualifiers(); i != e; ++i) 3187 TL.setProtocolLoc(i, DS.getProtocolLocs()[i]); 3188 } else { 3189 assert(TL.getNumProtocols() == 0); 3190 TL.setLAngleLoc(SourceLocation()); 3191 TL.setRAngleLoc(SourceLocation()); 3192 } 3193 } 3194 void VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL) { 3195 TL.setStarLoc(SourceLocation()); 3196 Visit(TL.getPointeeLoc()); 3197 } 3198 void VisitTemplateSpecializationTypeLoc(TemplateSpecializationTypeLoc TL) { 3199 TypeSourceInfo *TInfo = 0; 3200 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 3201 3202 // If we got no declarator info from previous Sema routines, 3203 // just fill with the typespec loc. 3204 if (!TInfo) { 3205 TL.initialize(Context, DS.getTypeSpecTypeNameLoc()); 3206 return; 3207 } 3208 3209 TypeLoc OldTL = TInfo->getTypeLoc(); 3210 if (TInfo->getType()->getAs<ElaboratedType>()) { 3211 ElaboratedTypeLoc ElabTL = OldTL.castAs<ElaboratedTypeLoc>(); 3212 TemplateSpecializationTypeLoc NamedTL = ElabTL.getNamedTypeLoc() 3213 .castAs<TemplateSpecializationTypeLoc>(); 3214 TL.copy(NamedTL); 3215 } 3216 else 3217 TL.copy(OldTL.castAs<TemplateSpecializationTypeLoc>()); 3218 } 3219 void VisitTypeOfExprTypeLoc(TypeOfExprTypeLoc TL) { 3220 assert(DS.getTypeSpecType() == DeclSpec::TST_typeofExpr); 3221 TL.setTypeofLoc(DS.getTypeSpecTypeLoc()); 3222 TL.setParensRange(DS.getTypeofParensRange()); 3223 } 3224 void VisitTypeOfTypeLoc(TypeOfTypeLoc TL) { 3225 assert(DS.getTypeSpecType() == DeclSpec::TST_typeofType); 3226 TL.setTypeofLoc(DS.getTypeSpecTypeLoc()); 3227 TL.setParensRange(DS.getTypeofParensRange()); 3228 assert(DS.getRepAsType()); 3229 TypeSourceInfo *TInfo = 0; 3230 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 3231 TL.setUnderlyingTInfo(TInfo); 3232 } 3233 void VisitUnaryTransformTypeLoc(UnaryTransformTypeLoc TL) { 3234 // FIXME: This holds only because we only have one unary transform. 3235 assert(DS.getTypeSpecType() == DeclSpec::TST_underlyingType); 3236 TL.setKWLoc(DS.getTypeSpecTypeLoc()); 3237 TL.setParensRange(DS.getTypeofParensRange()); 3238 assert(DS.getRepAsType()); 3239 TypeSourceInfo *TInfo = 0; 3240 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 3241 TL.setUnderlyingTInfo(TInfo); 3242 } 3243 void VisitBuiltinTypeLoc(BuiltinTypeLoc TL) { 3244 // By default, use the source location of the type specifier. 3245 TL.setBuiltinLoc(DS.getTypeSpecTypeLoc()); 3246 if (TL.needsExtraLocalData()) { 3247 // Set info for the written builtin specifiers. 3248 TL.getWrittenBuiltinSpecs() = DS.getWrittenBuiltinSpecs(); 3249 // Try to have a meaningful source location. 3250 if (TL.getWrittenSignSpec() != TSS_unspecified) 3251 // Sign spec loc overrides the others (e.g., 'unsigned long'). 3252 TL.setBuiltinLoc(DS.getTypeSpecSignLoc()); 3253 else if (TL.getWrittenWidthSpec() != TSW_unspecified) 3254 // Width spec loc overrides type spec loc (e.g., 'short int'). 3255 TL.setBuiltinLoc(DS.getTypeSpecWidthLoc()); 3256 } 3257 } 3258 void VisitElaboratedTypeLoc(ElaboratedTypeLoc TL) { 3259 ElaboratedTypeKeyword Keyword 3260 = TypeWithKeyword::getKeywordForTypeSpec(DS.getTypeSpecType()); 3261 if (DS.getTypeSpecType() == TST_typename) { 3262 TypeSourceInfo *TInfo = 0; 3263 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 3264 if (TInfo) { 3265 TL.copy(TInfo->getTypeLoc().castAs<ElaboratedTypeLoc>()); 3266 return; 3267 } 3268 } 3269 TL.setElaboratedKeywordLoc(Keyword != ETK_None 3270 ? DS.getTypeSpecTypeLoc() 3271 : SourceLocation()); 3272 const CXXScopeSpec& SS = DS.getTypeSpecScope(); 3273 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 3274 Visit(TL.getNextTypeLoc().getUnqualifiedLoc()); 3275 } 3276 void VisitDependentNameTypeLoc(DependentNameTypeLoc TL) { 3277 assert(DS.getTypeSpecType() == TST_typename); 3278 TypeSourceInfo *TInfo = 0; 3279 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 3280 assert(TInfo); 3281 TL.copy(TInfo->getTypeLoc().castAs<DependentNameTypeLoc>()); 3282 } 3283 void VisitDependentTemplateSpecializationTypeLoc( 3284 DependentTemplateSpecializationTypeLoc TL) { 3285 assert(DS.getTypeSpecType() == TST_typename); 3286 TypeSourceInfo *TInfo = 0; 3287 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 3288 assert(TInfo); 3289 TL.copy( 3290 TInfo->getTypeLoc().castAs<DependentTemplateSpecializationTypeLoc>()); 3291 } 3292 void VisitTagTypeLoc(TagTypeLoc TL) { 3293 TL.setNameLoc(DS.getTypeSpecTypeNameLoc()); 3294 } 3295 void VisitAtomicTypeLoc(AtomicTypeLoc TL) { 3296 TL.setKWLoc(DS.getTypeSpecTypeLoc()); 3297 TL.setParensRange(DS.getTypeofParensRange()); 3298 3299 TypeSourceInfo *TInfo = 0; 3300 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 3301 TL.getValueLoc().initializeFullCopy(TInfo->getTypeLoc()); 3302 } 3303 3304 void VisitTypeLoc(TypeLoc TL) { 3305 // FIXME: add other typespec types and change this to an assert. 3306 TL.initialize(Context, DS.getTypeSpecTypeLoc()); 3307 } 3308 }; 3309 3310 class DeclaratorLocFiller : public TypeLocVisitor<DeclaratorLocFiller> { 3311 ASTContext &Context; 3312 const DeclaratorChunk &Chunk; 3313 3314 public: 3315 DeclaratorLocFiller(ASTContext &Context, const DeclaratorChunk &Chunk) 3316 : Context(Context), Chunk(Chunk) {} 3317 3318 void VisitQualifiedTypeLoc(QualifiedTypeLoc TL) { 3319 llvm_unreachable("qualified type locs not expected here!"); 3320 } 3321 3322 void VisitAttributedTypeLoc(AttributedTypeLoc TL) { 3323 fillAttributedTypeLoc(TL, Chunk.getAttrs()); 3324 } 3325 void VisitBlockPointerTypeLoc(BlockPointerTypeLoc TL) { 3326 assert(Chunk.Kind == DeclaratorChunk::BlockPointer); 3327 TL.setCaretLoc(Chunk.Loc); 3328 } 3329 void VisitPointerTypeLoc(PointerTypeLoc TL) { 3330 assert(Chunk.Kind == DeclaratorChunk::Pointer); 3331 TL.setStarLoc(Chunk.Loc); 3332 } 3333 void VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL) { 3334 assert(Chunk.Kind == DeclaratorChunk::Pointer); 3335 TL.setStarLoc(Chunk.Loc); 3336 } 3337 void VisitMemberPointerTypeLoc(MemberPointerTypeLoc TL) { 3338 assert(Chunk.Kind == DeclaratorChunk::MemberPointer); 3339 const CXXScopeSpec& SS = Chunk.Mem.Scope(); 3340 NestedNameSpecifierLoc NNSLoc = SS.getWithLocInContext(Context); 3341 3342 const Type* ClsTy = TL.getClass(); 3343 QualType ClsQT = QualType(ClsTy, 0); 3344 TypeSourceInfo *ClsTInfo = Context.CreateTypeSourceInfo(ClsQT, 0); 3345 // Now copy source location info into the type loc component. 3346 TypeLoc ClsTL = ClsTInfo->getTypeLoc(); 3347 switch (NNSLoc.getNestedNameSpecifier()->getKind()) { 3348 case NestedNameSpecifier::Identifier: 3349 assert(isa<DependentNameType>(ClsTy) && "Unexpected TypeLoc"); 3350 { 3351 DependentNameTypeLoc DNTLoc = ClsTL.castAs<DependentNameTypeLoc>(); 3352 DNTLoc.setElaboratedKeywordLoc(SourceLocation()); 3353 DNTLoc.setQualifierLoc(NNSLoc.getPrefix()); 3354 DNTLoc.setNameLoc(NNSLoc.getLocalBeginLoc()); 3355 } 3356 break; 3357 3358 case NestedNameSpecifier::TypeSpec: 3359 case NestedNameSpecifier::TypeSpecWithTemplate: 3360 if (isa<ElaboratedType>(ClsTy)) { 3361 ElaboratedTypeLoc ETLoc = ClsTL.castAs<ElaboratedTypeLoc>(); 3362 ETLoc.setElaboratedKeywordLoc(SourceLocation()); 3363 ETLoc.setQualifierLoc(NNSLoc.getPrefix()); 3364 TypeLoc NamedTL = ETLoc.getNamedTypeLoc(); 3365 NamedTL.initializeFullCopy(NNSLoc.getTypeLoc()); 3366 } else { 3367 ClsTL.initializeFullCopy(NNSLoc.getTypeLoc()); 3368 } 3369 break; 3370 3371 case NestedNameSpecifier::Namespace: 3372 case NestedNameSpecifier::NamespaceAlias: 3373 case NestedNameSpecifier::Global: 3374 llvm_unreachable("Nested-name-specifier must name a type"); 3375 } 3376 3377 // Finally fill in MemberPointerLocInfo fields. 3378 TL.setStarLoc(Chunk.Loc); 3379 TL.setClassTInfo(ClsTInfo); 3380 } 3381 void VisitLValueReferenceTypeLoc(LValueReferenceTypeLoc TL) { 3382 assert(Chunk.Kind == DeclaratorChunk::Reference); 3383 // 'Amp' is misleading: this might have been originally 3384 /// spelled with AmpAmp. 3385 TL.setAmpLoc(Chunk.Loc); 3386 } 3387 void VisitRValueReferenceTypeLoc(RValueReferenceTypeLoc TL) { 3388 assert(Chunk.Kind == DeclaratorChunk::Reference); 3389 assert(!Chunk.Ref.LValueRef); 3390 TL.setAmpAmpLoc(Chunk.Loc); 3391 } 3392 void VisitArrayTypeLoc(ArrayTypeLoc TL) { 3393 assert(Chunk.Kind == DeclaratorChunk::Array); 3394 TL.setLBracketLoc(Chunk.Loc); 3395 TL.setRBracketLoc(Chunk.EndLoc); 3396 TL.setSizeExpr(static_cast<Expr*>(Chunk.Arr.NumElts)); 3397 } 3398 void VisitFunctionTypeLoc(FunctionTypeLoc TL) { 3399 assert(Chunk.Kind == DeclaratorChunk::Function); 3400 TL.setLocalRangeBegin(Chunk.Loc); 3401 TL.setLocalRangeEnd(Chunk.EndLoc); 3402 3403 const DeclaratorChunk::FunctionTypeInfo &FTI = Chunk.Fun; 3404 TL.setLParenLoc(FTI.getLParenLoc()); 3405 TL.setRParenLoc(FTI.getRParenLoc()); 3406 for (unsigned i = 0, e = TL.getNumArgs(), tpi = 0; i != e; ++i) { 3407 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 3408 TL.setArg(tpi++, Param); 3409 } 3410 // FIXME: exception specs 3411 } 3412 void VisitParenTypeLoc(ParenTypeLoc TL) { 3413 assert(Chunk.Kind == DeclaratorChunk::Paren); 3414 TL.setLParenLoc(Chunk.Loc); 3415 TL.setRParenLoc(Chunk.EndLoc); 3416 } 3417 3418 void VisitTypeLoc(TypeLoc TL) { 3419 llvm_unreachable("unsupported TypeLoc kind in declarator!"); 3420 } 3421 }; 3422} 3423 3424/// \brief Create and instantiate a TypeSourceInfo with type source information. 3425/// 3426/// \param T QualType referring to the type as written in source code. 3427/// 3428/// \param ReturnTypeInfo For declarators whose return type does not show 3429/// up in the normal place in the declaration specifiers (such as a C++ 3430/// conversion function), this pointer will refer to a type source information 3431/// for that return type. 3432TypeSourceInfo * 3433Sema::GetTypeSourceInfoForDeclarator(Declarator &D, QualType T, 3434 TypeSourceInfo *ReturnTypeInfo) { 3435 TypeSourceInfo *TInfo = Context.CreateTypeSourceInfo(T); 3436 UnqualTypeLoc CurrTL = TInfo->getTypeLoc().getUnqualifiedLoc(); 3437 3438 // Handle parameter packs whose type is a pack expansion. 3439 if (isa<PackExpansionType>(T)) { 3440 CurrTL.castAs<PackExpansionTypeLoc>().setEllipsisLoc(D.getEllipsisLoc()); 3441 CurrTL = CurrTL.getNextTypeLoc().getUnqualifiedLoc(); 3442 } 3443 3444 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 3445 while (AttributedTypeLoc TL = CurrTL.getAs<AttributedTypeLoc>()) { 3446 fillAttributedTypeLoc(TL, D.getTypeObject(i).getAttrs()); 3447 CurrTL = TL.getNextTypeLoc().getUnqualifiedLoc(); 3448 } 3449 3450 DeclaratorLocFiller(Context, D.getTypeObject(i)).Visit(CurrTL); 3451 CurrTL = CurrTL.getNextTypeLoc().getUnqualifiedLoc(); 3452 } 3453 3454 // If we have different source information for the return type, use 3455 // that. This really only applies to C++ conversion functions. 3456 if (ReturnTypeInfo) { 3457 TypeLoc TL = ReturnTypeInfo->getTypeLoc(); 3458 assert(TL.getFullDataSize() == CurrTL.getFullDataSize()); 3459 memcpy(CurrTL.getOpaqueData(), TL.getOpaqueData(), TL.getFullDataSize()); 3460 } else { 3461 TypeSpecLocFiller(Context, D.getDeclSpec()).Visit(CurrTL); 3462 } 3463 3464 return TInfo; 3465} 3466 3467/// \brief Create a LocInfoType to hold the given QualType and TypeSourceInfo. 3468ParsedType Sema::CreateParsedType(QualType T, TypeSourceInfo *TInfo) { 3469 // FIXME: LocInfoTypes are "transient", only needed for passing to/from Parser 3470 // and Sema during declaration parsing. Try deallocating/caching them when 3471 // it's appropriate, instead of allocating them and keeping them around. 3472 LocInfoType *LocT = (LocInfoType*)BumpAlloc.Allocate(sizeof(LocInfoType), 3473 TypeAlignment); 3474 new (LocT) LocInfoType(T, TInfo); 3475 assert(LocT->getTypeClass() != T->getTypeClass() && 3476 "LocInfoType's TypeClass conflicts with an existing Type class"); 3477 return ParsedType::make(QualType(LocT, 0)); 3478} 3479 3480void LocInfoType::getAsStringInternal(std::string &Str, 3481 const PrintingPolicy &Policy) const { 3482 llvm_unreachable("LocInfoType leaked into the type system; an opaque TypeTy*" 3483 " was used directly instead of getting the QualType through" 3484 " GetTypeFromParser"); 3485} 3486 3487TypeResult Sema::ActOnTypeName(Scope *S, Declarator &D) { 3488 // C99 6.7.6: Type names have no identifier. This is already validated by 3489 // the parser. 3490 assert(D.getIdentifier() == 0 && "Type name should have no identifier!"); 3491 3492 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 3493 QualType T = TInfo->getType(); 3494 if (D.isInvalidType()) 3495 return true; 3496 3497 // Make sure there are no unused decl attributes on the declarator. 3498 // We don't want to do this for ObjC parameters because we're going 3499 // to apply them to the actual parameter declaration. 3500 // Likewise, we don't want to do this for alias declarations, because 3501 // we are actually going to build a declaration from this eventually. 3502 if (D.getContext() != Declarator::ObjCParameterContext && 3503 D.getContext() != Declarator::AliasDeclContext && 3504 D.getContext() != Declarator::AliasTemplateContext) 3505 checkUnusedDeclAttributes(D); 3506 3507 if (getLangOpts().CPlusPlus) { 3508 // Check that there are no default arguments (C++ only). 3509 CheckExtraCXXDefaultArguments(D); 3510 } 3511 3512 return CreateParsedType(T, TInfo); 3513} 3514 3515ParsedType Sema::ActOnObjCInstanceType(SourceLocation Loc) { 3516 QualType T = Context.getObjCInstanceType(); 3517 TypeSourceInfo *TInfo = Context.getTrivialTypeSourceInfo(T, Loc); 3518 return CreateParsedType(T, TInfo); 3519} 3520 3521 3522//===----------------------------------------------------------------------===// 3523// Type Attribute Processing 3524//===----------------------------------------------------------------------===// 3525 3526/// HandleAddressSpaceTypeAttribute - Process an address_space attribute on the 3527/// specified type. The attribute contains 1 argument, the id of the address 3528/// space for the type. 3529static void HandleAddressSpaceTypeAttribute(QualType &Type, 3530 const AttributeList &Attr, Sema &S){ 3531 3532 // If this type is already address space qualified, reject it. 3533 // ISO/IEC TR 18037 S5.3 (amending C99 6.7.3): "No type shall be qualified by 3534 // qualifiers for two or more different address spaces." 3535 if (Type.getAddressSpace()) { 3536 S.Diag(Attr.getLoc(), diag::err_attribute_address_multiple_qualifiers); 3537 Attr.setInvalid(); 3538 return; 3539 } 3540 3541 // ISO/IEC TR 18037 S5.3 (amending C99 6.7.3): "A function type shall not be 3542 // qualified by an address-space qualifier." 3543 if (Type->isFunctionType()) { 3544 S.Diag(Attr.getLoc(), diag::err_attribute_address_function_type); 3545 Attr.setInvalid(); 3546 return; 3547 } 3548 3549 // Check the attribute arguments. 3550 if (Attr.getNumArgs() != 1) { 3551 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 3552 Attr.setInvalid(); 3553 return; 3554 } 3555 Expr *ASArgExpr = static_cast<Expr *>(Attr.getArg(0)); 3556 llvm::APSInt addrSpace(32); 3557 if (ASArgExpr->isTypeDependent() || ASArgExpr->isValueDependent() || 3558 !ASArgExpr->isIntegerConstantExpr(addrSpace, S.Context)) { 3559 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_not_int) 3560 << ASArgExpr->getSourceRange(); 3561 Attr.setInvalid(); 3562 return; 3563 } 3564 3565 // Bounds checking. 3566 if (addrSpace.isSigned()) { 3567 if (addrSpace.isNegative()) { 3568 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_negative) 3569 << ASArgExpr->getSourceRange(); 3570 Attr.setInvalid(); 3571 return; 3572 } 3573 addrSpace.setIsSigned(false); 3574 } 3575 llvm::APSInt max(addrSpace.getBitWidth()); 3576 max = Qualifiers::MaxAddressSpace; 3577 if (addrSpace > max) { 3578 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_too_high) 3579 << Qualifiers::MaxAddressSpace << ASArgExpr->getSourceRange(); 3580 Attr.setInvalid(); 3581 return; 3582 } 3583 3584 unsigned ASIdx = static_cast<unsigned>(addrSpace.getZExtValue()); 3585 Type = S.Context.getAddrSpaceQualType(Type, ASIdx); 3586} 3587 3588/// Does this type have a "direct" ownership qualifier? That is, 3589/// is it written like "__strong id", as opposed to something like 3590/// "typeof(foo)", where that happens to be strong? 3591static bool hasDirectOwnershipQualifier(QualType type) { 3592 // Fast path: no qualifier at all. 3593 assert(type.getQualifiers().hasObjCLifetime()); 3594 3595 while (true) { 3596 // __strong id 3597 if (const AttributedType *attr = dyn_cast<AttributedType>(type)) { 3598 if (attr->getAttrKind() == AttributedType::attr_objc_ownership) 3599 return true; 3600 3601 type = attr->getModifiedType(); 3602 3603 // X *__strong (...) 3604 } else if (const ParenType *paren = dyn_cast<ParenType>(type)) { 3605 type = paren->getInnerType(); 3606 3607 // That's it for things we want to complain about. In particular, 3608 // we do not want to look through typedefs, typeof(expr), 3609 // typeof(type), or any other way that the type is somehow 3610 // abstracted. 3611 } else { 3612 3613 return false; 3614 } 3615 } 3616} 3617 3618/// handleObjCOwnershipTypeAttr - Process an objc_ownership 3619/// attribute on the specified type. 3620/// 3621/// Returns 'true' if the attribute was handled. 3622static bool handleObjCOwnershipTypeAttr(TypeProcessingState &state, 3623 AttributeList &attr, 3624 QualType &type) { 3625 bool NonObjCPointer = false; 3626 3627 if (!type->isDependentType()) { 3628 if (const PointerType *ptr = type->getAs<PointerType>()) { 3629 QualType pointee = ptr->getPointeeType(); 3630 if (pointee->isObjCRetainableType() || pointee->isPointerType()) 3631 return false; 3632 // It is important not to lose the source info that there was an attribute 3633 // applied to non-objc pointer. We will create an attributed type but 3634 // its type will be the same as the original type. 3635 NonObjCPointer = true; 3636 } else if (!type->isObjCRetainableType()) { 3637 return false; 3638 } 3639 } 3640 3641 Sema &S = state.getSema(); 3642 SourceLocation AttrLoc = attr.getLoc(); 3643 if (AttrLoc.isMacroID()) 3644 AttrLoc = S.getSourceManager().getImmediateExpansionRange(AttrLoc).first; 3645 3646 if (!attr.getParameterName()) { 3647 S.Diag(AttrLoc, diag::err_attribute_argument_n_not_string) 3648 << "objc_ownership" << 1; 3649 attr.setInvalid(); 3650 return true; 3651 } 3652 3653 // Consume lifetime attributes without further comment outside of 3654 // ARC mode. 3655 if (!S.getLangOpts().ObjCAutoRefCount) 3656 return true; 3657 3658 Qualifiers::ObjCLifetime lifetime; 3659 if (attr.getParameterName()->isStr("none")) 3660 lifetime = Qualifiers::OCL_ExplicitNone; 3661 else if (attr.getParameterName()->isStr("strong")) 3662 lifetime = Qualifiers::OCL_Strong; 3663 else if (attr.getParameterName()->isStr("weak")) 3664 lifetime = Qualifiers::OCL_Weak; 3665 else if (attr.getParameterName()->isStr("autoreleasing")) 3666 lifetime = Qualifiers::OCL_Autoreleasing; 3667 else { 3668 S.Diag(AttrLoc, diag::warn_attribute_type_not_supported) 3669 << "objc_ownership" << attr.getParameterName(); 3670 attr.setInvalid(); 3671 return true; 3672 } 3673 3674 SplitQualType underlyingType = type.split(); 3675 3676 // Check for redundant/conflicting ownership qualifiers. 3677 if (Qualifiers::ObjCLifetime previousLifetime 3678 = type.getQualifiers().getObjCLifetime()) { 3679 // If it's written directly, that's an error. 3680 if (hasDirectOwnershipQualifier(type)) { 3681 S.Diag(AttrLoc, diag::err_attr_objc_ownership_redundant) 3682 << type; 3683 return true; 3684 } 3685 3686 // Otherwise, if the qualifiers actually conflict, pull sugar off 3687 // until we reach a type that is directly qualified. 3688 if (previousLifetime != lifetime) { 3689 // This should always terminate: the canonical type is 3690 // qualified, so some bit of sugar must be hiding it. 3691 while (!underlyingType.Quals.hasObjCLifetime()) { 3692 underlyingType = underlyingType.getSingleStepDesugaredType(); 3693 } 3694 underlyingType.Quals.removeObjCLifetime(); 3695 } 3696 } 3697 3698 underlyingType.Quals.addObjCLifetime(lifetime); 3699 3700 if (NonObjCPointer) { 3701 StringRef name = attr.getName()->getName(); 3702 switch (lifetime) { 3703 case Qualifiers::OCL_None: 3704 case Qualifiers::OCL_ExplicitNone: 3705 break; 3706 case Qualifiers::OCL_Strong: name = "__strong"; break; 3707 case Qualifiers::OCL_Weak: name = "__weak"; break; 3708 case Qualifiers::OCL_Autoreleasing: name = "__autoreleasing"; break; 3709 } 3710 S.Diag(AttrLoc, diag::warn_objc_object_attribute_wrong_type) 3711 << name << type; 3712 } 3713 3714 QualType origType = type; 3715 if (!NonObjCPointer) 3716 type = S.Context.getQualifiedType(underlyingType); 3717 3718 // If we have a valid source location for the attribute, use an 3719 // AttributedType instead. 3720 if (AttrLoc.isValid()) 3721 type = S.Context.getAttributedType(AttributedType::attr_objc_ownership, 3722 origType, type); 3723 3724 // Forbid __weak if the runtime doesn't support it. 3725 if (lifetime == Qualifiers::OCL_Weak && 3726 !S.getLangOpts().ObjCARCWeak && !NonObjCPointer) { 3727 3728 // Actually, delay this until we know what we're parsing. 3729 if (S.DelayedDiagnostics.shouldDelayDiagnostics()) { 3730 S.DelayedDiagnostics.add( 3731 sema::DelayedDiagnostic::makeForbiddenType( 3732 S.getSourceManager().getExpansionLoc(AttrLoc), 3733 diag::err_arc_weak_no_runtime, type, /*ignored*/ 0)); 3734 } else { 3735 S.Diag(AttrLoc, diag::err_arc_weak_no_runtime); 3736 } 3737 3738 attr.setInvalid(); 3739 return true; 3740 } 3741 3742 // Forbid __weak for class objects marked as 3743 // objc_arc_weak_reference_unavailable 3744 if (lifetime == Qualifiers::OCL_Weak) { 3745 QualType T = type; 3746 while (const PointerType *ptr = T->getAs<PointerType>()) 3747 T = ptr->getPointeeType(); 3748 if (const ObjCObjectPointerType *ObjT = T->getAs<ObjCObjectPointerType>()) { 3749 if (ObjCInterfaceDecl *Class = ObjT->getInterfaceDecl()) { 3750 if (Class->isArcWeakrefUnavailable()) { 3751 S.Diag(AttrLoc, diag::err_arc_unsupported_weak_class); 3752 S.Diag(ObjT->getInterfaceDecl()->getLocation(), 3753 diag::note_class_declared); 3754 } 3755 } 3756 } 3757 } 3758 3759 return true; 3760} 3761 3762/// handleObjCGCTypeAttr - Process the __attribute__((objc_gc)) type 3763/// attribute on the specified type. Returns true to indicate that 3764/// the attribute was handled, false to indicate that the type does 3765/// not permit the attribute. 3766static bool handleObjCGCTypeAttr(TypeProcessingState &state, 3767 AttributeList &attr, 3768 QualType &type) { 3769 Sema &S = state.getSema(); 3770 3771 // Delay if this isn't some kind of pointer. 3772 if (!type->isPointerType() && 3773 !type->isObjCObjectPointerType() && 3774 !type->isBlockPointerType()) 3775 return false; 3776 3777 if (type.getObjCGCAttr() != Qualifiers::GCNone) { 3778 S.Diag(attr.getLoc(), diag::err_attribute_multiple_objc_gc); 3779 attr.setInvalid(); 3780 return true; 3781 } 3782 3783 // Check the attribute arguments. 3784 if (!attr.getParameterName()) { 3785 S.Diag(attr.getLoc(), diag::err_attribute_argument_n_not_string) 3786 << "objc_gc" << 1; 3787 attr.setInvalid(); 3788 return true; 3789 } 3790 Qualifiers::GC GCAttr; 3791 if (attr.getNumArgs() != 0) { 3792 S.Diag(attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 3793 attr.setInvalid(); 3794 return true; 3795 } 3796 if (attr.getParameterName()->isStr("weak")) 3797 GCAttr = Qualifiers::Weak; 3798 else if (attr.getParameterName()->isStr("strong")) 3799 GCAttr = Qualifiers::Strong; 3800 else { 3801 S.Diag(attr.getLoc(), diag::warn_attribute_type_not_supported) 3802 << "objc_gc" << attr.getParameterName(); 3803 attr.setInvalid(); 3804 return true; 3805 } 3806 3807 QualType origType = type; 3808 type = S.Context.getObjCGCQualType(origType, GCAttr); 3809 3810 // Make an attributed type to preserve the source information. 3811 if (attr.getLoc().isValid()) 3812 type = S.Context.getAttributedType(AttributedType::attr_objc_gc, 3813 origType, type); 3814 3815 return true; 3816} 3817 3818namespace { 3819 /// A helper class to unwrap a type down to a function for the 3820 /// purposes of applying attributes there. 3821 /// 3822 /// Use: 3823 /// FunctionTypeUnwrapper unwrapped(SemaRef, T); 3824 /// if (unwrapped.isFunctionType()) { 3825 /// const FunctionType *fn = unwrapped.get(); 3826 /// // change fn somehow 3827 /// T = unwrapped.wrap(fn); 3828 /// } 3829 struct FunctionTypeUnwrapper { 3830 enum WrapKind { 3831 Desugar, 3832 Parens, 3833 Pointer, 3834 BlockPointer, 3835 Reference, 3836 MemberPointer 3837 }; 3838 3839 QualType Original; 3840 const FunctionType *Fn; 3841 SmallVector<unsigned char /*WrapKind*/, 8> Stack; 3842 3843 FunctionTypeUnwrapper(Sema &S, QualType T) : Original(T) { 3844 while (true) { 3845 const Type *Ty = T.getTypePtr(); 3846 if (isa<FunctionType>(Ty)) { 3847 Fn = cast<FunctionType>(Ty); 3848 return; 3849 } else if (isa<ParenType>(Ty)) { 3850 T = cast<ParenType>(Ty)->getInnerType(); 3851 Stack.push_back(Parens); 3852 } else if (isa<PointerType>(Ty)) { 3853 T = cast<PointerType>(Ty)->getPointeeType(); 3854 Stack.push_back(Pointer); 3855 } else if (isa<BlockPointerType>(Ty)) { 3856 T = cast<BlockPointerType>(Ty)->getPointeeType(); 3857 Stack.push_back(BlockPointer); 3858 } else if (isa<MemberPointerType>(Ty)) { 3859 T = cast<MemberPointerType>(Ty)->getPointeeType(); 3860 Stack.push_back(MemberPointer); 3861 } else if (isa<ReferenceType>(Ty)) { 3862 T = cast<ReferenceType>(Ty)->getPointeeType(); 3863 Stack.push_back(Reference); 3864 } else { 3865 const Type *DTy = Ty->getUnqualifiedDesugaredType(); 3866 if (Ty == DTy) { 3867 Fn = 0; 3868 return; 3869 } 3870 3871 T = QualType(DTy, 0); 3872 Stack.push_back(Desugar); 3873 } 3874 } 3875 } 3876 3877 bool isFunctionType() const { return (Fn != 0); } 3878 const FunctionType *get() const { return Fn; } 3879 3880 QualType wrap(Sema &S, const FunctionType *New) { 3881 // If T wasn't modified from the unwrapped type, do nothing. 3882 if (New == get()) return Original; 3883 3884 Fn = New; 3885 return wrap(S.Context, Original, 0); 3886 } 3887 3888 private: 3889 QualType wrap(ASTContext &C, QualType Old, unsigned I) { 3890 if (I == Stack.size()) 3891 return C.getQualifiedType(Fn, Old.getQualifiers()); 3892 3893 // Build up the inner type, applying the qualifiers from the old 3894 // type to the new type. 3895 SplitQualType SplitOld = Old.split(); 3896 3897 // As a special case, tail-recurse if there are no qualifiers. 3898 if (SplitOld.Quals.empty()) 3899 return wrap(C, SplitOld.Ty, I); 3900 return C.getQualifiedType(wrap(C, SplitOld.Ty, I), SplitOld.Quals); 3901 } 3902 3903 QualType wrap(ASTContext &C, const Type *Old, unsigned I) { 3904 if (I == Stack.size()) return QualType(Fn, 0); 3905 3906 switch (static_cast<WrapKind>(Stack[I++])) { 3907 case Desugar: 3908 // This is the point at which we potentially lose source 3909 // information. 3910 return wrap(C, Old->getUnqualifiedDesugaredType(), I); 3911 3912 case Parens: { 3913 QualType New = wrap(C, cast<ParenType>(Old)->getInnerType(), I); 3914 return C.getParenType(New); 3915 } 3916 3917 case Pointer: { 3918 QualType New = wrap(C, cast<PointerType>(Old)->getPointeeType(), I); 3919 return C.getPointerType(New); 3920 } 3921 3922 case BlockPointer: { 3923 QualType New = wrap(C, cast<BlockPointerType>(Old)->getPointeeType(),I); 3924 return C.getBlockPointerType(New); 3925 } 3926 3927 case MemberPointer: { 3928 const MemberPointerType *OldMPT = cast<MemberPointerType>(Old); 3929 QualType New = wrap(C, OldMPT->getPointeeType(), I); 3930 return C.getMemberPointerType(New, OldMPT->getClass()); 3931 } 3932 3933 case Reference: { 3934 const ReferenceType *OldRef = cast<ReferenceType>(Old); 3935 QualType New = wrap(C, OldRef->getPointeeType(), I); 3936 if (isa<LValueReferenceType>(OldRef)) 3937 return C.getLValueReferenceType(New, OldRef->isSpelledAsLValue()); 3938 else 3939 return C.getRValueReferenceType(New); 3940 } 3941 } 3942 3943 llvm_unreachable("unknown wrapping kind"); 3944 } 3945 }; 3946} 3947 3948/// Process an individual function attribute. Returns true to 3949/// indicate that the attribute was handled, false if it wasn't. 3950static bool handleFunctionTypeAttr(TypeProcessingState &state, 3951 AttributeList &attr, 3952 QualType &type) { 3953 Sema &S = state.getSema(); 3954 3955 FunctionTypeUnwrapper unwrapped(S, type); 3956 3957 if (attr.getKind() == AttributeList::AT_NoReturn) { 3958 if (S.CheckNoReturnAttr(attr)) 3959 return true; 3960 3961 // Delay if this is not a function type. 3962 if (!unwrapped.isFunctionType()) 3963 return false; 3964 3965 // Otherwise we can process right away. 3966 FunctionType::ExtInfo EI = unwrapped.get()->getExtInfo().withNoReturn(true); 3967 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 3968 return true; 3969 } 3970 3971 // ns_returns_retained is not always a type attribute, but if we got 3972 // here, we're treating it as one right now. 3973 if (attr.getKind() == AttributeList::AT_NSReturnsRetained) { 3974 assert(S.getLangOpts().ObjCAutoRefCount && 3975 "ns_returns_retained treated as type attribute in non-ARC"); 3976 if (attr.getNumArgs()) return true; 3977 3978 // Delay if this is not a function type. 3979 if (!unwrapped.isFunctionType()) 3980 return false; 3981 3982 FunctionType::ExtInfo EI 3983 = unwrapped.get()->getExtInfo().withProducesResult(true); 3984 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 3985 return true; 3986 } 3987 3988 if (attr.getKind() == AttributeList::AT_Regparm) { 3989 unsigned value; 3990 if (S.CheckRegparmAttr(attr, value)) 3991 return true; 3992 3993 // Delay if this is not a function type. 3994 if (!unwrapped.isFunctionType()) 3995 return false; 3996 3997 // Diagnose regparm with fastcall. 3998 const FunctionType *fn = unwrapped.get(); 3999 CallingConv CC = fn->getCallConv(); 4000 if (CC == CC_X86FastCall) { 4001 S.Diag(attr.getLoc(), diag::err_attributes_are_not_compatible) 4002 << FunctionType::getNameForCallConv(CC) 4003 << "regparm"; 4004 attr.setInvalid(); 4005 return true; 4006 } 4007 4008 FunctionType::ExtInfo EI = 4009 unwrapped.get()->getExtInfo().withRegParm(value); 4010 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 4011 return true; 4012 } 4013 4014 // Delay if the type didn't work out to a function. 4015 if (!unwrapped.isFunctionType()) return false; 4016 4017 // Otherwise, a calling convention. 4018 CallingConv CC; 4019 if (S.CheckCallingConvAttr(attr, CC)) 4020 return true; 4021 4022 const FunctionType *fn = unwrapped.get(); 4023 CallingConv CCOld = fn->getCallConv(); 4024 if (S.Context.getCanonicalCallConv(CC) == 4025 S.Context.getCanonicalCallConv(CCOld)) { 4026 FunctionType::ExtInfo EI= unwrapped.get()->getExtInfo().withCallingConv(CC); 4027 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 4028 return true; 4029 } 4030 4031 if (CCOld != (S.LangOpts.MRTD ? CC_X86StdCall : CC_Default)) { 4032 // Should we diagnose reapplications of the same convention? 4033 S.Diag(attr.getLoc(), diag::err_attributes_are_not_compatible) 4034 << FunctionType::getNameForCallConv(CC) 4035 << FunctionType::getNameForCallConv(CCOld); 4036 attr.setInvalid(); 4037 return true; 4038 } 4039 4040 // Diagnose the use of X86 fastcall on varargs or unprototyped functions. 4041 if (CC == CC_X86FastCall) { 4042 if (isa<FunctionNoProtoType>(fn)) { 4043 S.Diag(attr.getLoc(), diag::err_cconv_knr) 4044 << FunctionType::getNameForCallConv(CC); 4045 attr.setInvalid(); 4046 return true; 4047 } 4048 4049 const FunctionProtoType *FnP = cast<FunctionProtoType>(fn); 4050 if (FnP->isVariadic()) { 4051 S.Diag(attr.getLoc(), diag::err_cconv_varargs) 4052 << FunctionType::getNameForCallConv(CC); 4053 attr.setInvalid(); 4054 return true; 4055 } 4056 4057 // Also diagnose fastcall with regparm. 4058 if (fn->getHasRegParm()) { 4059 S.Diag(attr.getLoc(), diag::err_attributes_are_not_compatible) 4060 << "regparm" 4061 << FunctionType::getNameForCallConv(CC); 4062 attr.setInvalid(); 4063 return true; 4064 } 4065 } 4066 4067 FunctionType::ExtInfo EI = unwrapped.get()->getExtInfo().withCallingConv(CC); 4068 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 4069 return true; 4070} 4071 4072/// Handle OpenCL image access qualifiers: read_only, write_only, read_write 4073static void HandleOpenCLImageAccessAttribute(QualType& CurType, 4074 const AttributeList &Attr, 4075 Sema &S) { 4076 // Check the attribute arguments. 4077 if (Attr.getNumArgs() != 1) { 4078 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 4079 Attr.setInvalid(); 4080 return; 4081 } 4082 Expr *sizeExpr = static_cast<Expr *>(Attr.getArg(0)); 4083 llvm::APSInt arg(32); 4084 if (sizeExpr->isTypeDependent() || sizeExpr->isValueDependent() || 4085 !sizeExpr->isIntegerConstantExpr(arg, S.Context)) { 4086 S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int) 4087 << "opencl_image_access" << sizeExpr->getSourceRange(); 4088 Attr.setInvalid(); 4089 return; 4090 } 4091 unsigned iarg = static_cast<unsigned>(arg.getZExtValue()); 4092 switch (iarg) { 4093 case CLIA_read_only: 4094 case CLIA_write_only: 4095 case CLIA_read_write: 4096 // Implemented in a separate patch 4097 break; 4098 default: 4099 // Implemented in a separate patch 4100 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_size) 4101 << sizeExpr->getSourceRange(); 4102 Attr.setInvalid(); 4103 break; 4104 } 4105} 4106 4107/// HandleVectorSizeAttribute - this attribute is only applicable to integral 4108/// and float scalars, although arrays, pointers, and function return values are 4109/// allowed in conjunction with this construct. Aggregates with this attribute 4110/// are invalid, even if they are of the same size as a corresponding scalar. 4111/// The raw attribute should contain precisely 1 argument, the vector size for 4112/// the variable, measured in bytes. If curType and rawAttr are well formed, 4113/// this routine will return a new vector type. 4114static void HandleVectorSizeAttr(QualType& CurType, const AttributeList &Attr, 4115 Sema &S) { 4116 // Check the attribute arguments. 4117 if (Attr.getNumArgs() != 1) { 4118 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 4119 Attr.setInvalid(); 4120 return; 4121 } 4122 Expr *sizeExpr = static_cast<Expr *>(Attr.getArg(0)); 4123 llvm::APSInt vecSize(32); 4124 if (sizeExpr->isTypeDependent() || sizeExpr->isValueDependent() || 4125 !sizeExpr->isIntegerConstantExpr(vecSize, S.Context)) { 4126 S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int) 4127 << "vector_size" << sizeExpr->getSourceRange(); 4128 Attr.setInvalid(); 4129 return; 4130 } 4131 // the base type must be integer or float, and can't already be a vector. 4132 if (!CurType->isIntegerType() && !CurType->isRealFloatingType()) { 4133 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_vector_type) << CurType; 4134 Attr.setInvalid(); 4135 return; 4136 } 4137 unsigned typeSize = static_cast<unsigned>(S.Context.getTypeSize(CurType)); 4138 // vecSize is specified in bytes - convert to bits. 4139 unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue() * 8); 4140 4141 // the vector size needs to be an integral multiple of the type size. 4142 if (vectorSize % typeSize) { 4143 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_size) 4144 << sizeExpr->getSourceRange(); 4145 Attr.setInvalid(); 4146 return; 4147 } 4148 if (vectorSize == 0) { 4149 S.Diag(Attr.getLoc(), diag::err_attribute_zero_size) 4150 << sizeExpr->getSourceRange(); 4151 Attr.setInvalid(); 4152 return; 4153 } 4154 4155 // Success! Instantiate the vector type, the number of elements is > 0, and 4156 // not required to be a power of 2, unlike GCC. 4157 CurType = S.Context.getVectorType(CurType, vectorSize/typeSize, 4158 VectorType::GenericVector); 4159} 4160 4161/// \brief Process the OpenCL-like ext_vector_type attribute when it occurs on 4162/// a type. 4163static void HandleExtVectorTypeAttr(QualType &CurType, 4164 const AttributeList &Attr, 4165 Sema &S) { 4166 Expr *sizeExpr; 4167 4168 // Special case where the argument is a template id. 4169 if (Attr.getParameterName()) { 4170 CXXScopeSpec SS; 4171 SourceLocation TemplateKWLoc; 4172 UnqualifiedId id; 4173 id.setIdentifier(Attr.getParameterName(), Attr.getLoc()); 4174 4175 ExprResult Size = S.ActOnIdExpression(S.getCurScope(), SS, TemplateKWLoc, 4176 id, false, false); 4177 if (Size.isInvalid()) 4178 return; 4179 4180 sizeExpr = Size.get(); 4181 } else { 4182 // check the attribute arguments. 4183 if (Attr.getNumArgs() != 1) { 4184 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 4185 return; 4186 } 4187 sizeExpr = Attr.getArg(0); 4188 } 4189 4190 // Create the vector type. 4191 QualType T = S.BuildExtVectorType(CurType, sizeExpr, Attr.getLoc()); 4192 if (!T.isNull()) 4193 CurType = T; 4194} 4195 4196/// HandleNeonVectorTypeAttr - The "neon_vector_type" and 4197/// "neon_polyvector_type" attributes are used to create vector types that 4198/// are mangled according to ARM's ABI. Otherwise, these types are identical 4199/// to those created with the "vector_size" attribute. Unlike "vector_size" 4200/// the argument to these Neon attributes is the number of vector elements, 4201/// not the vector size in bytes. The vector width and element type must 4202/// match one of the standard Neon vector types. 4203static void HandleNeonVectorTypeAttr(QualType& CurType, 4204 const AttributeList &Attr, Sema &S, 4205 VectorType::VectorKind VecKind, 4206 const char *AttrName) { 4207 // Check the attribute arguments. 4208 if (Attr.getNumArgs() != 1) { 4209 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 4210 Attr.setInvalid(); 4211 return; 4212 } 4213 // The number of elements must be an ICE. 4214 Expr *numEltsExpr = static_cast<Expr *>(Attr.getArg(0)); 4215 llvm::APSInt numEltsInt(32); 4216 if (numEltsExpr->isTypeDependent() || numEltsExpr->isValueDependent() || 4217 !numEltsExpr->isIntegerConstantExpr(numEltsInt, S.Context)) { 4218 S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int) 4219 << AttrName << numEltsExpr->getSourceRange(); 4220 Attr.setInvalid(); 4221 return; 4222 } 4223 // Only certain element types are supported for Neon vectors. 4224 const BuiltinType* BTy = CurType->getAs<BuiltinType>(); 4225 if (!BTy || 4226 (VecKind == VectorType::NeonPolyVector && 4227 BTy->getKind() != BuiltinType::SChar && 4228 BTy->getKind() != BuiltinType::Short) || 4229 (BTy->getKind() != BuiltinType::SChar && 4230 BTy->getKind() != BuiltinType::UChar && 4231 BTy->getKind() != BuiltinType::Short && 4232 BTy->getKind() != BuiltinType::UShort && 4233 BTy->getKind() != BuiltinType::Int && 4234 BTy->getKind() != BuiltinType::UInt && 4235 BTy->getKind() != BuiltinType::LongLong && 4236 BTy->getKind() != BuiltinType::ULongLong && 4237 BTy->getKind() != BuiltinType::Float)) { 4238 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_vector_type) <<CurType; 4239 Attr.setInvalid(); 4240 return; 4241 } 4242 // The total size of the vector must be 64 or 128 bits. 4243 unsigned typeSize = static_cast<unsigned>(S.Context.getTypeSize(CurType)); 4244 unsigned numElts = static_cast<unsigned>(numEltsInt.getZExtValue()); 4245 unsigned vecSize = typeSize * numElts; 4246 if (vecSize != 64 && vecSize != 128) { 4247 S.Diag(Attr.getLoc(), diag::err_attribute_bad_neon_vector_size) << CurType; 4248 Attr.setInvalid(); 4249 return; 4250 } 4251 4252 CurType = S.Context.getVectorType(CurType, numElts, VecKind); 4253} 4254 4255static void processTypeAttrs(TypeProcessingState &state, QualType &type, 4256 TypeAttrLocation TAL, AttributeList *attrs) { 4257 // Scan through and apply attributes to this type where it makes sense. Some 4258 // attributes (such as __address_space__, __vector_size__, etc) apply to the 4259 // type, but others can be present in the type specifiers even though they 4260 // apply to the decl. Here we apply type attributes and ignore the rest. 4261 4262 AttributeList *next; 4263 do { 4264 AttributeList &attr = *attrs; 4265 next = attr.getNext(); 4266 4267 // Skip attributes that were marked to be invalid. 4268 if (attr.isInvalid()) 4269 continue; 4270 4271 if (attr.isCXX11Attribute()) { 4272 // [[gnu::...]] attributes are treated as declaration attributes, so may 4273 // not appertain to a DeclaratorChunk, even if we handle them as type 4274 // attributes. 4275 if (attr.getScopeName() && attr.getScopeName()->isStr("gnu")) { 4276 if (TAL == TAL_DeclChunk) { 4277 state.getSema().Diag(attr.getLoc(), 4278 diag::warn_cxx11_gnu_attribute_on_type) 4279 << attr.getName(); 4280 continue; 4281 } 4282 } else if (TAL != TAL_DeclChunk) { 4283 // Otherwise, only consider type processing for a C++11 attribute if 4284 // it's actually been applied to a type. 4285 continue; 4286 } 4287 } 4288 4289 // If this is an attribute we can handle, do so now, 4290 // otherwise, add it to the FnAttrs list for rechaining. 4291 switch (attr.getKind()) { 4292 default: 4293 // A C++11 attribute on a declarator chunk must appertain to a type. 4294 if (attr.isCXX11Attribute() && TAL == TAL_DeclChunk) { 4295 state.getSema().Diag(attr.getLoc(), diag::err_attribute_not_type_attr) 4296 << attr.getName(); 4297 attr.setUsedAsTypeAttr(); 4298 } 4299 break; 4300 4301 case AttributeList::UnknownAttribute: 4302 if (attr.isCXX11Attribute() && TAL == TAL_DeclChunk) 4303 state.getSema().Diag(attr.getLoc(), 4304 diag::warn_unknown_attribute_ignored) 4305 << attr.getName(); 4306 break; 4307 4308 case AttributeList::IgnoredAttribute: 4309 break; 4310 4311 case AttributeList::AT_MayAlias: 4312 // FIXME: This attribute needs to actually be handled, but if we ignore 4313 // it it breaks large amounts of Linux software. 4314 attr.setUsedAsTypeAttr(); 4315 break; 4316 case AttributeList::AT_AddressSpace: 4317 HandleAddressSpaceTypeAttribute(type, attr, state.getSema()); 4318 attr.setUsedAsTypeAttr(); 4319 break; 4320 OBJC_POINTER_TYPE_ATTRS_CASELIST: 4321 if (!handleObjCPointerTypeAttr(state, attr, type)) 4322 distributeObjCPointerTypeAttr(state, attr, type); 4323 attr.setUsedAsTypeAttr(); 4324 break; 4325 case AttributeList::AT_VectorSize: 4326 HandleVectorSizeAttr(type, attr, state.getSema()); 4327 attr.setUsedAsTypeAttr(); 4328 break; 4329 case AttributeList::AT_ExtVectorType: 4330 HandleExtVectorTypeAttr(type, attr, state.getSema()); 4331 attr.setUsedAsTypeAttr(); 4332 break; 4333 case AttributeList::AT_NeonVectorType: 4334 HandleNeonVectorTypeAttr(type, attr, state.getSema(), 4335 VectorType::NeonVector, "neon_vector_type"); 4336 attr.setUsedAsTypeAttr(); 4337 break; 4338 case AttributeList::AT_NeonPolyVectorType: 4339 HandleNeonVectorTypeAttr(type, attr, state.getSema(), 4340 VectorType::NeonPolyVector, 4341 "neon_polyvector_type"); 4342 attr.setUsedAsTypeAttr(); 4343 break; 4344 case AttributeList::AT_OpenCLImageAccess: 4345 HandleOpenCLImageAccessAttribute(type, attr, state.getSema()); 4346 attr.setUsedAsTypeAttr(); 4347 break; 4348 4349 case AttributeList::AT_Win64: 4350 case AttributeList::AT_Ptr32: 4351 case AttributeList::AT_Ptr64: 4352 // FIXME: Don't ignore these. We have partial handling for them as 4353 // declaration attributes in SemaDeclAttr.cpp; that should be moved here. 4354 attr.setUsedAsTypeAttr(); 4355 break; 4356 4357 case AttributeList::AT_NSReturnsRetained: 4358 if (!state.getSema().getLangOpts().ObjCAutoRefCount) 4359 break; 4360 // fallthrough into the function attrs 4361 4362 FUNCTION_TYPE_ATTRS_CASELIST: 4363 attr.setUsedAsTypeAttr(); 4364 4365 // Never process function type attributes as part of the 4366 // declaration-specifiers. 4367 if (TAL == TAL_DeclSpec) 4368 distributeFunctionTypeAttrFromDeclSpec(state, attr, type); 4369 4370 // Otherwise, handle the possible delays. 4371 else if (!handleFunctionTypeAttr(state, attr, type)) 4372 distributeFunctionTypeAttr(state, attr, type); 4373 break; 4374 } 4375 } while ((attrs = next)); 4376} 4377 4378/// \brief Ensure that the type of the given expression is complete. 4379/// 4380/// This routine checks whether the expression \p E has a complete type. If the 4381/// expression refers to an instantiable construct, that instantiation is 4382/// performed as needed to complete its type. Furthermore 4383/// Sema::RequireCompleteType is called for the expression's type (or in the 4384/// case of a reference type, the referred-to type). 4385/// 4386/// \param E The expression whose type is required to be complete. 4387/// \param Diagnoser The object that will emit a diagnostic if the type is 4388/// incomplete. 4389/// 4390/// \returns \c true if the type of \p E is incomplete and diagnosed, \c false 4391/// otherwise. 4392bool Sema::RequireCompleteExprType(Expr *E, TypeDiagnoser &Diagnoser){ 4393 QualType T = E->getType(); 4394 4395 // Fast path the case where the type is already complete. 4396 if (!T->isIncompleteType()) 4397 return false; 4398 4399 // Incomplete array types may be completed by the initializer attached to 4400 // their definitions. For static data members of class templates we need to 4401 // instantiate the definition to get this initializer and complete the type. 4402 if (T->isIncompleteArrayType()) { 4403 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E->IgnoreParens())) { 4404 if (VarDecl *Var = dyn_cast<VarDecl>(DRE->getDecl())) { 4405 if (Var->isStaticDataMember() && 4406 Var->getInstantiatedFromStaticDataMember()) { 4407 4408 MemberSpecializationInfo *MSInfo = Var->getMemberSpecializationInfo(); 4409 assert(MSInfo && "Missing member specialization information?"); 4410 if (MSInfo->getTemplateSpecializationKind() 4411 != TSK_ExplicitSpecialization) { 4412 // If we don't already have a point of instantiation, this is it. 4413 if (MSInfo->getPointOfInstantiation().isInvalid()) { 4414 MSInfo->setPointOfInstantiation(E->getLocStart()); 4415 4416 // This is a modification of an existing AST node. Notify 4417 // listeners. 4418 if (ASTMutationListener *L = getASTMutationListener()) 4419 L->StaticDataMemberInstantiated(Var); 4420 } 4421 4422 InstantiateStaticDataMemberDefinition(E->getExprLoc(), Var); 4423 4424 // Update the type to the newly instantiated definition's type both 4425 // here and within the expression. 4426 if (VarDecl *Def = Var->getDefinition()) { 4427 DRE->setDecl(Def); 4428 T = Def->getType(); 4429 DRE->setType(T); 4430 E->setType(T); 4431 } 4432 } 4433 4434 // We still go on to try to complete the type independently, as it 4435 // may also require instantiations or diagnostics if it remains 4436 // incomplete. 4437 } 4438 } 4439 } 4440 } 4441 4442 // FIXME: Are there other cases which require instantiating something other 4443 // than the type to complete the type of an expression? 4444 4445 // Look through reference types and complete the referred type. 4446 if (const ReferenceType *Ref = T->getAs<ReferenceType>()) 4447 T = Ref->getPointeeType(); 4448 4449 return RequireCompleteType(E->getExprLoc(), T, Diagnoser); 4450} 4451 4452namespace { 4453 struct TypeDiagnoserDiag : Sema::TypeDiagnoser { 4454 unsigned DiagID; 4455 4456 TypeDiagnoserDiag(unsigned DiagID) 4457 : Sema::TypeDiagnoser(DiagID == 0), DiagID(DiagID) {} 4458 4459 virtual void diagnose(Sema &S, SourceLocation Loc, QualType T) { 4460 if (Suppressed) return; 4461 S.Diag(Loc, DiagID) << T; 4462 } 4463 }; 4464} 4465 4466bool Sema::RequireCompleteExprType(Expr *E, unsigned DiagID) { 4467 TypeDiagnoserDiag Diagnoser(DiagID); 4468 return RequireCompleteExprType(E, Diagnoser); 4469} 4470 4471/// @brief Ensure that the type T is a complete type. 4472/// 4473/// This routine checks whether the type @p T is complete in any 4474/// context where a complete type is required. If @p T is a complete 4475/// type, returns false. If @p T is a class template specialization, 4476/// this routine then attempts to perform class template 4477/// instantiation. If instantiation fails, or if @p T is incomplete 4478/// and cannot be completed, issues the diagnostic @p diag (giving it 4479/// the type @p T) and returns true. 4480/// 4481/// @param Loc The location in the source that the incomplete type 4482/// diagnostic should refer to. 4483/// 4484/// @param T The type that this routine is examining for completeness. 4485/// 4486/// @returns @c true if @p T is incomplete and a diagnostic was emitted, 4487/// @c false otherwise. 4488bool Sema::RequireCompleteType(SourceLocation Loc, QualType T, 4489 TypeDiagnoser &Diagnoser) { 4490 // FIXME: Add this assertion to make sure we always get instantiation points. 4491 // assert(!Loc.isInvalid() && "Invalid location in RequireCompleteType"); 4492 // FIXME: Add this assertion to help us flush out problems with 4493 // checking for dependent types and type-dependent expressions. 4494 // 4495 // assert(!T->isDependentType() && 4496 // "Can't ask whether a dependent type is complete"); 4497 4498 // If we have a complete type, we're done. 4499 NamedDecl *Def = 0; 4500 if (!T->isIncompleteType(&Def)) { 4501 // If we know about the definition but it is not visible, complain. 4502 if (!Diagnoser.Suppressed && Def && !LookupResult::isVisible(Def)) { 4503 // Suppress this error outside of a SFINAE context if we've already 4504 // emitted the error once for this type. There's no usefulness in 4505 // repeating the diagnostic. 4506 // FIXME: Add a Fix-It that imports the corresponding module or includes 4507 // the header. 4508 Module *Owner = Def->getOwningModule(); 4509 Diag(Loc, diag::err_module_private_definition) 4510 << T << Owner->getFullModuleName(); 4511 Diag(Def->getLocation(), diag::note_previous_definition); 4512 4513 if (!isSFINAEContext()) { 4514 // Recover by implicitly importing this module. 4515 createImplicitModuleImport(Loc, Owner); 4516 } 4517 } 4518 4519 return false; 4520 } 4521 4522 const TagType *Tag = T->getAs<TagType>(); 4523 const ObjCInterfaceType *IFace = 0; 4524 4525 if (Tag) { 4526 // Avoid diagnosing invalid decls as incomplete. 4527 if (Tag->getDecl()->isInvalidDecl()) 4528 return true; 4529 4530 // Give the external AST source a chance to complete the type. 4531 if (Tag->getDecl()->hasExternalLexicalStorage()) { 4532 Context.getExternalSource()->CompleteType(Tag->getDecl()); 4533 if (!Tag->isIncompleteType()) 4534 return false; 4535 } 4536 } 4537 else if ((IFace = T->getAs<ObjCInterfaceType>())) { 4538 // Avoid diagnosing invalid decls as incomplete. 4539 if (IFace->getDecl()->isInvalidDecl()) 4540 return true; 4541 4542 // Give the external AST source a chance to complete the type. 4543 if (IFace->getDecl()->hasExternalLexicalStorage()) { 4544 Context.getExternalSource()->CompleteType(IFace->getDecl()); 4545 if (!IFace->isIncompleteType()) 4546 return false; 4547 } 4548 } 4549 4550 // If we have a class template specialization or a class member of a 4551 // class template specialization, or an array with known size of such, 4552 // try to instantiate it. 4553 QualType MaybeTemplate = T; 4554 while (const ConstantArrayType *Array 4555 = Context.getAsConstantArrayType(MaybeTemplate)) 4556 MaybeTemplate = Array->getElementType(); 4557 if (const RecordType *Record = MaybeTemplate->getAs<RecordType>()) { 4558 if (ClassTemplateSpecializationDecl *ClassTemplateSpec 4559 = dyn_cast<ClassTemplateSpecializationDecl>(Record->getDecl())) { 4560 if (ClassTemplateSpec->getSpecializationKind() == TSK_Undeclared) 4561 return InstantiateClassTemplateSpecialization(Loc, ClassTemplateSpec, 4562 TSK_ImplicitInstantiation, 4563 /*Complain=*/!Diagnoser.Suppressed); 4564 } else if (CXXRecordDecl *Rec 4565 = dyn_cast<CXXRecordDecl>(Record->getDecl())) { 4566 CXXRecordDecl *Pattern = Rec->getInstantiatedFromMemberClass(); 4567 if (!Rec->isBeingDefined() && Pattern) { 4568 MemberSpecializationInfo *MSI = Rec->getMemberSpecializationInfo(); 4569 assert(MSI && "Missing member specialization information?"); 4570 // This record was instantiated from a class within a template. 4571 if (MSI->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 4572 return InstantiateClass(Loc, Rec, Pattern, 4573 getTemplateInstantiationArgs(Rec), 4574 TSK_ImplicitInstantiation, 4575 /*Complain=*/!Diagnoser.Suppressed); 4576 } 4577 } 4578 } 4579 4580 if (Diagnoser.Suppressed) 4581 return true; 4582 4583 // We have an incomplete type. Produce a diagnostic. 4584 Diagnoser.diagnose(*this, Loc, T); 4585 4586 // If the type was a forward declaration of a class/struct/union 4587 // type, produce a note. 4588 if (Tag && !Tag->getDecl()->isInvalidDecl()) 4589 Diag(Tag->getDecl()->getLocation(), 4590 Tag->isBeingDefined() ? diag::note_type_being_defined 4591 : diag::note_forward_declaration) 4592 << QualType(Tag, 0); 4593 4594 // If the Objective-C class was a forward declaration, produce a note. 4595 if (IFace && !IFace->getDecl()->isInvalidDecl()) 4596 Diag(IFace->getDecl()->getLocation(), diag::note_forward_class); 4597 4598 return true; 4599} 4600 4601bool Sema::RequireCompleteType(SourceLocation Loc, QualType T, 4602 unsigned DiagID) { 4603 TypeDiagnoserDiag Diagnoser(DiagID); 4604 return RequireCompleteType(Loc, T, Diagnoser); 4605} 4606 4607/// \brief Get diagnostic %select index for tag kind for 4608/// literal type diagnostic message. 4609/// WARNING: Indexes apply to particular diagnostics only! 4610/// 4611/// \returns diagnostic %select index. 4612static unsigned getLiteralDiagFromTagKind(TagTypeKind Tag) { 4613 switch (Tag) { 4614 case TTK_Struct: return 0; 4615 case TTK_Interface: return 1; 4616 case TTK_Class: return 2; 4617 default: llvm_unreachable("Invalid tag kind for literal type diagnostic!"); 4618 } 4619} 4620 4621/// @brief Ensure that the type T is a literal type. 4622/// 4623/// This routine checks whether the type @p T is a literal type. If @p T is an 4624/// incomplete type, an attempt is made to complete it. If @p T is a literal 4625/// type, or @p AllowIncompleteType is true and @p T is an incomplete type, 4626/// returns false. Otherwise, this routine issues the diagnostic @p PD (giving 4627/// it the type @p T), along with notes explaining why the type is not a 4628/// literal type, and returns true. 4629/// 4630/// @param Loc The location in the source that the non-literal type 4631/// diagnostic should refer to. 4632/// 4633/// @param T The type that this routine is examining for literalness. 4634/// 4635/// @param Diagnoser Emits a diagnostic if T is not a literal type. 4636/// 4637/// @returns @c true if @p T is not a literal type and a diagnostic was emitted, 4638/// @c false otherwise. 4639bool Sema::RequireLiteralType(SourceLocation Loc, QualType T, 4640 TypeDiagnoser &Diagnoser) { 4641 assert(!T->isDependentType() && "type should not be dependent"); 4642 4643 QualType ElemType = Context.getBaseElementType(T); 4644 RequireCompleteType(Loc, ElemType, 0); 4645 4646 if (T->isLiteralType()) 4647 return false; 4648 4649 if (Diagnoser.Suppressed) 4650 return true; 4651 4652 Diagnoser.diagnose(*this, Loc, T); 4653 4654 if (T->isVariableArrayType()) 4655 return true; 4656 4657 const RecordType *RT = ElemType->getAs<RecordType>(); 4658 if (!RT) 4659 return true; 4660 4661 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 4662 4663 // A partially-defined class type can't be a literal type, because a literal 4664 // class type must have a trivial destructor (which can't be checked until 4665 // the class definition is complete). 4666 if (!RD->isCompleteDefinition()) { 4667 RequireCompleteType(Loc, ElemType, diag::note_non_literal_incomplete, T); 4668 return true; 4669 } 4670 4671 // If the class has virtual base classes, then it's not an aggregate, and 4672 // cannot have any constexpr constructors or a trivial default constructor, 4673 // so is non-literal. This is better to diagnose than the resulting absence 4674 // of constexpr constructors. 4675 if (RD->getNumVBases()) { 4676 Diag(RD->getLocation(), diag::note_non_literal_virtual_base) 4677 << getLiteralDiagFromTagKind(RD->getTagKind()) << RD->getNumVBases(); 4678 for (CXXRecordDecl::base_class_const_iterator I = RD->vbases_begin(), 4679 E = RD->vbases_end(); I != E; ++I) 4680 Diag(I->getLocStart(), 4681 diag::note_constexpr_virtual_base_here) << I->getSourceRange(); 4682 } else if (!RD->isAggregate() && !RD->hasConstexprNonCopyMoveConstructor() && 4683 !RD->hasTrivialDefaultConstructor()) { 4684 Diag(RD->getLocation(), diag::note_non_literal_no_constexpr_ctors) << RD; 4685 } else if (RD->hasNonLiteralTypeFieldsOrBases()) { 4686 for (CXXRecordDecl::base_class_const_iterator I = RD->bases_begin(), 4687 E = RD->bases_end(); I != E; ++I) { 4688 if (!I->getType()->isLiteralType()) { 4689 Diag(I->getLocStart(), 4690 diag::note_non_literal_base_class) 4691 << RD << I->getType() << I->getSourceRange(); 4692 return true; 4693 } 4694 } 4695 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 4696 E = RD->field_end(); I != E; ++I) { 4697 if (!I->getType()->isLiteralType() || 4698 I->getType().isVolatileQualified()) { 4699 Diag(I->getLocation(), diag::note_non_literal_field) 4700 << RD << *I << I->getType() 4701 << I->getType().isVolatileQualified(); 4702 return true; 4703 } 4704 } 4705 } else if (!RD->hasTrivialDestructor()) { 4706 // All fields and bases are of literal types, so have trivial destructors. 4707 // If this class's destructor is non-trivial it must be user-declared. 4708 CXXDestructorDecl *Dtor = RD->getDestructor(); 4709 assert(Dtor && "class has literal fields and bases but no dtor?"); 4710 if (!Dtor) 4711 return true; 4712 4713 Diag(Dtor->getLocation(), Dtor->isUserProvided() ? 4714 diag::note_non_literal_user_provided_dtor : 4715 diag::note_non_literal_nontrivial_dtor) << RD; 4716 if (!Dtor->isUserProvided()) 4717 SpecialMemberIsTrivial(Dtor, CXXDestructor, /*Diagnose*/true); 4718 } 4719 4720 return true; 4721} 4722 4723bool Sema::RequireLiteralType(SourceLocation Loc, QualType T, unsigned DiagID) { 4724 TypeDiagnoserDiag Diagnoser(DiagID); 4725 return RequireLiteralType(Loc, T, Diagnoser); 4726} 4727 4728/// \brief Retrieve a version of the type 'T' that is elaborated by Keyword 4729/// and qualified by the nested-name-specifier contained in SS. 4730QualType Sema::getElaboratedType(ElaboratedTypeKeyword Keyword, 4731 const CXXScopeSpec &SS, QualType T) { 4732 if (T.isNull()) 4733 return T; 4734 NestedNameSpecifier *NNS; 4735 if (SS.isValid()) 4736 NNS = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 4737 else { 4738 if (Keyword == ETK_None) 4739 return T; 4740 NNS = 0; 4741 } 4742 return Context.getElaboratedType(Keyword, NNS, T); 4743} 4744 4745QualType Sema::BuildTypeofExprType(Expr *E, SourceLocation Loc) { 4746 ExprResult ER = CheckPlaceholderExpr(E); 4747 if (ER.isInvalid()) return QualType(); 4748 E = ER.take(); 4749 4750 if (!E->isTypeDependent()) { 4751 QualType T = E->getType(); 4752 if (const TagType *TT = T->getAs<TagType>()) 4753 DiagnoseUseOfDecl(TT->getDecl(), E->getExprLoc()); 4754 } 4755 return Context.getTypeOfExprType(E); 4756} 4757 4758/// getDecltypeForExpr - Given an expr, will return the decltype for 4759/// that expression, according to the rules in C++11 4760/// [dcl.type.simple]p4 and C++11 [expr.lambda.prim]p18. 4761static QualType getDecltypeForExpr(Sema &S, Expr *E) { 4762 if (E->isTypeDependent()) 4763 return S.Context.DependentTy; 4764 4765 // C++11 [dcl.type.simple]p4: 4766 // The type denoted by decltype(e) is defined as follows: 4767 // 4768 // - if e is an unparenthesized id-expression or an unparenthesized class 4769 // member access (5.2.5), decltype(e) is the type of the entity named 4770 // by e. If there is no such entity, or if e names a set of overloaded 4771 // functions, the program is ill-formed; 4772 // 4773 // We apply the same rules for Objective-C ivar and property references. 4774 if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E)) { 4775 if (const ValueDecl *VD = dyn_cast<ValueDecl>(DRE->getDecl())) 4776 return VD->getType(); 4777 } else if (const MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 4778 if (const FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl())) 4779 return FD->getType(); 4780 } else if (const ObjCIvarRefExpr *IR = dyn_cast<ObjCIvarRefExpr>(E)) { 4781 return IR->getDecl()->getType(); 4782 } else if (const ObjCPropertyRefExpr *PR = dyn_cast<ObjCPropertyRefExpr>(E)) { 4783 if (PR->isExplicitProperty()) 4784 return PR->getExplicitProperty()->getType(); 4785 } 4786 4787 // C++11 [expr.lambda.prim]p18: 4788 // Every occurrence of decltype((x)) where x is a possibly 4789 // parenthesized id-expression that names an entity of automatic 4790 // storage duration is treated as if x were transformed into an 4791 // access to a corresponding data member of the closure type that 4792 // would have been declared if x were an odr-use of the denoted 4793 // entity. 4794 using namespace sema; 4795 if (S.getCurLambda()) { 4796 if (isa<ParenExpr>(E)) { 4797 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E->IgnoreParens())) { 4798 if (VarDecl *Var = dyn_cast<VarDecl>(DRE->getDecl())) { 4799 QualType T = S.getCapturedDeclRefType(Var, DRE->getLocation()); 4800 if (!T.isNull()) 4801 return S.Context.getLValueReferenceType(T); 4802 } 4803 } 4804 } 4805 } 4806 4807 4808 // C++11 [dcl.type.simple]p4: 4809 // [...] 4810 QualType T = E->getType(); 4811 switch (E->getValueKind()) { 4812 // - otherwise, if e is an xvalue, decltype(e) is T&&, where T is the 4813 // type of e; 4814 case VK_XValue: T = S.Context.getRValueReferenceType(T); break; 4815 // - otherwise, if e is an lvalue, decltype(e) is T&, where T is the 4816 // type of e; 4817 case VK_LValue: T = S.Context.getLValueReferenceType(T); break; 4818 // - otherwise, decltype(e) is the type of e. 4819 case VK_RValue: break; 4820 } 4821 4822 return T; 4823} 4824 4825QualType Sema::BuildDecltypeType(Expr *E, SourceLocation Loc) { 4826 ExprResult ER = CheckPlaceholderExpr(E); 4827 if (ER.isInvalid()) return QualType(); 4828 E = ER.take(); 4829 4830 return Context.getDecltypeType(E, getDecltypeForExpr(*this, E)); 4831} 4832 4833QualType Sema::BuildUnaryTransformType(QualType BaseType, 4834 UnaryTransformType::UTTKind UKind, 4835 SourceLocation Loc) { 4836 switch (UKind) { 4837 case UnaryTransformType::EnumUnderlyingType: 4838 if (!BaseType->isDependentType() && !BaseType->isEnumeralType()) { 4839 Diag(Loc, diag::err_only_enums_have_underlying_types); 4840 return QualType(); 4841 } else { 4842 QualType Underlying = BaseType; 4843 if (!BaseType->isDependentType()) { 4844 EnumDecl *ED = BaseType->getAs<EnumType>()->getDecl(); 4845 assert(ED && "EnumType has no EnumDecl"); 4846 DiagnoseUseOfDecl(ED, Loc); 4847 Underlying = ED->getIntegerType(); 4848 } 4849 assert(!Underlying.isNull()); 4850 return Context.getUnaryTransformType(BaseType, Underlying, 4851 UnaryTransformType::EnumUnderlyingType); 4852 } 4853 } 4854 llvm_unreachable("unknown unary transform type"); 4855} 4856 4857QualType Sema::BuildAtomicType(QualType T, SourceLocation Loc) { 4858 if (!T->isDependentType()) { 4859 // FIXME: It isn't entirely clear whether incomplete atomic types 4860 // are allowed or not; for simplicity, ban them for the moment. 4861 if (RequireCompleteType(Loc, T, diag::err_atomic_specifier_bad_type, 0)) 4862 return QualType(); 4863 4864 int DisallowedKind = -1; 4865 if (T->isArrayType()) 4866 DisallowedKind = 1; 4867 else if (T->isFunctionType()) 4868 DisallowedKind = 2; 4869 else if (T->isReferenceType()) 4870 DisallowedKind = 3; 4871 else if (T->isAtomicType()) 4872 DisallowedKind = 4; 4873 else if (T.hasQualifiers()) 4874 DisallowedKind = 5; 4875 else if (!T.isTriviallyCopyableType(Context)) 4876 // Some other non-trivially-copyable type (probably a C++ class) 4877 DisallowedKind = 6; 4878 4879 if (DisallowedKind != -1) { 4880 Diag(Loc, diag::err_atomic_specifier_bad_type) << DisallowedKind << T; 4881 return QualType(); 4882 } 4883 4884 // FIXME: Do we need any handling for ARC here? 4885 } 4886 4887 // Build the pointer type. 4888 return Context.getAtomicType(T); 4889} 4890