SemaType.cpp revision 617bb317a7aeb6c3468a4170a5d6c1058da7cea1
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_error: 956 Result = Context.IntTy; 957 declarator.setInvalidType(true); 958 break; 959 } 960 961 // Handle complex types. 962 if (DS.getTypeSpecComplex() == DeclSpec::TSC_complex) { 963 if (S.getLangOpts().Freestanding) 964 S.Diag(DS.getTypeSpecComplexLoc(), diag::ext_freestanding_complex); 965 Result = Context.getComplexType(Result); 966 } else if (DS.isTypeAltiVecVector()) { 967 unsigned typeSize = static_cast<unsigned>(Context.getTypeSize(Result)); 968 assert(typeSize > 0 && "type size for vector must be greater than 0 bits"); 969 VectorType::VectorKind VecKind = VectorType::AltiVecVector; 970 if (DS.isTypeAltiVecPixel()) 971 VecKind = VectorType::AltiVecPixel; 972 else if (DS.isTypeAltiVecBool()) 973 VecKind = VectorType::AltiVecBool; 974 Result = Context.getVectorType(Result, 128/typeSize, VecKind); 975 } 976 977 // FIXME: Imaginary. 978 if (DS.getTypeSpecComplex() == DeclSpec::TSC_imaginary) 979 S.Diag(DS.getTypeSpecComplexLoc(), diag::err_imaginary_not_supported); 980 981 // Before we process any type attributes, synthesize a block literal 982 // function declarator if necessary. 983 if (declarator.getContext() == Declarator::BlockLiteralContext) 984 maybeSynthesizeBlockSignature(state, Result); 985 986 // Apply any type attributes from the decl spec. This may cause the 987 // list of type attributes to be temporarily saved while the type 988 // attributes are pushed around. 989 if (AttributeList *attrs = DS.getAttributes().getList()) 990 processTypeAttrs(state, Result, TAL_DeclSpec, attrs); 991 992 // Apply const/volatile/restrict qualifiers to T. 993 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 994 995 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 996 // or incomplete types shall not be restrict-qualified." C++ also allows 997 // restrict-qualified references. 998 if (TypeQuals & DeclSpec::TQ_restrict) { 999 if (Result->isAnyPointerType() || Result->isReferenceType()) { 1000 QualType EltTy; 1001 if (Result->isObjCObjectPointerType()) 1002 EltTy = Result; 1003 else 1004 EltTy = Result->isPointerType() ? 1005 Result->getAs<PointerType>()->getPointeeType() : 1006 Result->getAs<ReferenceType>()->getPointeeType(); 1007 1008 // If we have a pointer or reference, the pointee must have an object 1009 // incomplete type. 1010 if (!EltTy->isIncompleteOrObjectType()) { 1011 S.Diag(DS.getRestrictSpecLoc(), 1012 diag::err_typecheck_invalid_restrict_invalid_pointee) 1013 << EltTy << DS.getSourceRange(); 1014 TypeQuals &= ~DeclSpec::TQ_restrict; // Remove the restrict qualifier. 1015 } 1016 } else { 1017 S.Diag(DS.getRestrictSpecLoc(), 1018 diag::err_typecheck_invalid_restrict_not_pointer) 1019 << Result << DS.getSourceRange(); 1020 TypeQuals &= ~DeclSpec::TQ_restrict; // Remove the restrict qualifier. 1021 } 1022 } 1023 1024 // Warn about CV qualifiers on functions: C99 6.7.3p8: "If the specification 1025 // of a function type includes any type qualifiers, the behavior is 1026 // undefined." 1027 if (Result->isFunctionType() && TypeQuals) { 1028 // Get some location to point at, either the C or V location. 1029 SourceLocation Loc; 1030 if (TypeQuals & DeclSpec::TQ_const) 1031 Loc = DS.getConstSpecLoc(); 1032 else if (TypeQuals & DeclSpec::TQ_volatile) 1033 Loc = DS.getVolatileSpecLoc(); 1034 else { 1035 assert((TypeQuals & DeclSpec::TQ_restrict) && 1036 "Has CVR quals but not C, V, or R?"); 1037 Loc = DS.getRestrictSpecLoc(); 1038 } 1039 S.Diag(Loc, diag::warn_typecheck_function_qualifiers) 1040 << Result << DS.getSourceRange(); 1041 } 1042 1043 // C++ [dcl.ref]p1: 1044 // Cv-qualified references are ill-formed except when the 1045 // cv-qualifiers are introduced through the use of a typedef 1046 // (7.1.3) or of a template type argument (14.3), in which 1047 // case the cv-qualifiers are ignored. 1048 // FIXME: Shouldn't we be checking SCS_typedef here? 1049 if (DS.getTypeSpecType() == DeclSpec::TST_typename && 1050 TypeQuals && Result->isReferenceType()) { 1051 TypeQuals &= ~DeclSpec::TQ_const; 1052 TypeQuals &= ~DeclSpec::TQ_volatile; 1053 } 1054 1055 // C90 6.5.3 constraints: "The same type qualifier shall not appear more 1056 // than once in the same specifier-list or qualifier-list, either directly 1057 // or via one or more typedefs." 1058 if (!S.getLangOpts().C99 && !S.getLangOpts().CPlusPlus 1059 && TypeQuals & Result.getCVRQualifiers()) { 1060 if (TypeQuals & DeclSpec::TQ_const && Result.isConstQualified()) { 1061 S.Diag(DS.getConstSpecLoc(), diag::ext_duplicate_declspec) 1062 << "const"; 1063 } 1064 1065 if (TypeQuals & DeclSpec::TQ_volatile && Result.isVolatileQualified()) { 1066 S.Diag(DS.getVolatileSpecLoc(), diag::ext_duplicate_declspec) 1067 << "volatile"; 1068 } 1069 1070 // C90 doesn't have restrict, so it doesn't force us to produce a warning 1071 // in this case. 1072 } 1073 1074 Qualifiers Quals = Qualifiers::fromCVRMask(TypeQuals); 1075 Result = Context.getQualifiedType(Result, Quals); 1076 } 1077 1078 return Result; 1079} 1080 1081static std::string getPrintableNameForEntity(DeclarationName Entity) { 1082 if (Entity) 1083 return Entity.getAsString(); 1084 1085 return "type name"; 1086} 1087 1088QualType Sema::BuildQualifiedType(QualType T, SourceLocation Loc, 1089 Qualifiers Qs) { 1090 // Enforce C99 6.7.3p2: "Types other than pointer types derived from 1091 // object or incomplete types shall not be restrict-qualified." 1092 if (Qs.hasRestrict()) { 1093 unsigned DiagID = 0; 1094 QualType ProblemTy; 1095 1096 const Type *Ty = T->getCanonicalTypeInternal().getTypePtr(); 1097 if (const ReferenceType *RTy = dyn_cast<ReferenceType>(Ty)) { 1098 if (!RTy->getPointeeType()->isIncompleteOrObjectType()) { 1099 DiagID = diag::err_typecheck_invalid_restrict_invalid_pointee; 1100 ProblemTy = T->getAs<ReferenceType>()->getPointeeType(); 1101 } 1102 } else if (const PointerType *PTy = dyn_cast<PointerType>(Ty)) { 1103 if (!PTy->getPointeeType()->isIncompleteOrObjectType()) { 1104 DiagID = diag::err_typecheck_invalid_restrict_invalid_pointee; 1105 ProblemTy = T->getAs<PointerType>()->getPointeeType(); 1106 } 1107 } else if (const MemberPointerType *PTy = dyn_cast<MemberPointerType>(Ty)) { 1108 if (!PTy->getPointeeType()->isIncompleteOrObjectType()) { 1109 DiagID = diag::err_typecheck_invalid_restrict_invalid_pointee; 1110 ProblemTy = T->getAs<PointerType>()->getPointeeType(); 1111 } 1112 } else if (!Ty->isDependentType()) { 1113 // FIXME: this deserves a proper diagnostic 1114 DiagID = diag::err_typecheck_invalid_restrict_invalid_pointee; 1115 ProblemTy = T; 1116 } 1117 1118 if (DiagID) { 1119 Diag(Loc, DiagID) << ProblemTy; 1120 Qs.removeRestrict(); 1121 } 1122 } 1123 1124 return Context.getQualifiedType(T, Qs); 1125} 1126 1127/// \brief Build a paren type including \p T. 1128QualType Sema::BuildParenType(QualType T) { 1129 return Context.getParenType(T); 1130} 1131 1132/// Given that we're building a pointer or reference to the given 1133static QualType inferARCLifetimeForPointee(Sema &S, QualType type, 1134 SourceLocation loc, 1135 bool isReference) { 1136 // Bail out if retention is unrequired or already specified. 1137 if (!type->isObjCLifetimeType() || 1138 type.getObjCLifetime() != Qualifiers::OCL_None) 1139 return type; 1140 1141 Qualifiers::ObjCLifetime implicitLifetime = Qualifiers::OCL_None; 1142 1143 // If the object type is const-qualified, we can safely use 1144 // __unsafe_unretained. This is safe (because there are no read 1145 // barriers), and it'll be safe to coerce anything but __weak* to 1146 // the resulting type. 1147 if (type.isConstQualified()) { 1148 implicitLifetime = Qualifiers::OCL_ExplicitNone; 1149 1150 // Otherwise, check whether the static type does not require 1151 // retaining. This currently only triggers for Class (possibly 1152 // protocol-qualifed, and arrays thereof). 1153 } else if (type->isObjCARCImplicitlyUnretainedType()) { 1154 implicitLifetime = Qualifiers::OCL_ExplicitNone; 1155 1156 // If we are in an unevaluated context, like sizeof, skip adding a 1157 // qualification. 1158 } else if (S.isUnevaluatedContext()) { 1159 return type; 1160 1161 // If that failed, give an error and recover using __strong. __strong 1162 // is the option most likely to prevent spurious second-order diagnostics, 1163 // like when binding a reference to a field. 1164 } else { 1165 // These types can show up in private ivars in system headers, so 1166 // we need this to not be an error in those cases. Instead we 1167 // want to delay. 1168 if (S.DelayedDiagnostics.shouldDelayDiagnostics()) { 1169 S.DelayedDiagnostics.add( 1170 sema::DelayedDiagnostic::makeForbiddenType(loc, 1171 diag::err_arc_indirect_no_ownership, type, isReference)); 1172 } else { 1173 S.Diag(loc, diag::err_arc_indirect_no_ownership) << type << isReference; 1174 } 1175 implicitLifetime = Qualifiers::OCL_Strong; 1176 } 1177 assert(implicitLifetime && "didn't infer any lifetime!"); 1178 1179 Qualifiers qs; 1180 qs.addObjCLifetime(implicitLifetime); 1181 return S.Context.getQualifiedType(type, qs); 1182} 1183 1184/// \brief Build a pointer type. 1185/// 1186/// \param T The type to which we'll be building a pointer. 1187/// 1188/// \param Loc The location of the entity whose type involves this 1189/// pointer type or, if there is no such entity, the location of the 1190/// type that will have pointer type. 1191/// 1192/// \param Entity The name of the entity that involves the pointer 1193/// type, if known. 1194/// 1195/// \returns A suitable pointer type, if there are no 1196/// errors. Otherwise, returns a NULL type. 1197QualType Sema::BuildPointerType(QualType T, 1198 SourceLocation Loc, DeclarationName Entity) { 1199 if (T->isReferenceType()) { 1200 // C++ 8.3.2p4: There shall be no ... pointers to references ... 1201 Diag(Loc, diag::err_illegal_decl_pointer_to_reference) 1202 << getPrintableNameForEntity(Entity) << T; 1203 return QualType(); 1204 } 1205 1206 assert(!T->isObjCObjectType() && "Should build ObjCObjectPointerType"); 1207 1208 // In ARC, it is forbidden to build pointers to unqualified pointers. 1209 if (getLangOpts().ObjCAutoRefCount) 1210 T = inferARCLifetimeForPointee(*this, T, Loc, /*reference*/ false); 1211 1212 // Build the pointer type. 1213 return Context.getPointerType(T); 1214} 1215 1216/// \brief Build a reference type. 1217/// 1218/// \param T The type to which we'll be building a reference. 1219/// 1220/// \param Loc The location of the entity whose type involves this 1221/// reference type or, if there is no such entity, the location of the 1222/// type that will have reference type. 1223/// 1224/// \param Entity The name of the entity that involves the reference 1225/// type, if known. 1226/// 1227/// \returns A suitable reference type, if there are no 1228/// errors. Otherwise, returns a NULL type. 1229QualType Sema::BuildReferenceType(QualType T, bool SpelledAsLValue, 1230 SourceLocation Loc, 1231 DeclarationName Entity) { 1232 assert(Context.getCanonicalType(T) != Context.OverloadTy && 1233 "Unresolved overloaded function type"); 1234 1235 // C++0x [dcl.ref]p6: 1236 // If a typedef (7.1.3), a type template-parameter (14.3.1), or a 1237 // decltype-specifier (7.1.6.2) denotes a type TR that is a reference to a 1238 // type T, an attempt to create the type "lvalue reference to cv TR" creates 1239 // the type "lvalue reference to T", while an attempt to create the type 1240 // "rvalue reference to cv TR" creates the type TR. 1241 bool LValueRef = SpelledAsLValue || T->getAs<LValueReferenceType>(); 1242 1243 // C++ [dcl.ref]p4: There shall be no references to references. 1244 // 1245 // According to C++ DR 106, references to references are only 1246 // diagnosed when they are written directly (e.g., "int & &"), 1247 // but not when they happen via a typedef: 1248 // 1249 // typedef int& intref; 1250 // typedef intref& intref2; 1251 // 1252 // Parser::ParseDeclaratorInternal diagnoses the case where 1253 // references are written directly; here, we handle the 1254 // collapsing of references-to-references as described in C++0x. 1255 // DR 106 and 540 introduce reference-collapsing into C++98/03. 1256 1257 // C++ [dcl.ref]p1: 1258 // A declarator that specifies the type "reference to cv void" 1259 // is ill-formed. 1260 if (T->isVoidType()) { 1261 Diag(Loc, diag::err_reference_to_void); 1262 return QualType(); 1263 } 1264 1265 // In ARC, it is forbidden to build references to unqualified pointers. 1266 if (getLangOpts().ObjCAutoRefCount) 1267 T = inferARCLifetimeForPointee(*this, T, Loc, /*reference*/ true); 1268 1269 // Handle restrict on references. 1270 if (LValueRef) 1271 return Context.getLValueReferenceType(T, SpelledAsLValue); 1272 return Context.getRValueReferenceType(T); 1273} 1274 1275/// Check whether the specified array size makes the array type a VLA. If so, 1276/// return true, if not, return the size of the array in SizeVal. 1277static bool isArraySizeVLA(Sema &S, Expr *ArraySize, llvm::APSInt &SizeVal) { 1278 // If the size is an ICE, it certainly isn't a VLA. If we're in a GNU mode 1279 // (like gnu99, but not c99) accept any evaluatable value as an extension. 1280 class VLADiagnoser : public Sema::VerifyICEDiagnoser { 1281 public: 1282 VLADiagnoser() : Sema::VerifyICEDiagnoser(true) {} 1283 1284 virtual void diagnoseNotICE(Sema &S, SourceLocation Loc, SourceRange SR) { 1285 } 1286 1287 virtual void diagnoseFold(Sema &S, SourceLocation Loc, SourceRange SR) { 1288 S.Diag(Loc, diag::ext_vla_folded_to_constant) << SR; 1289 } 1290 } Diagnoser; 1291 1292 return S.VerifyIntegerConstantExpression(ArraySize, &SizeVal, Diagnoser, 1293 S.LangOpts.GNUMode).isInvalid(); 1294} 1295 1296 1297/// \brief Build an array type. 1298/// 1299/// \param T The type of each element in the array. 1300/// 1301/// \param ASM C99 array size modifier (e.g., '*', 'static'). 1302/// 1303/// \param ArraySize Expression describing the size of the array. 1304/// 1305/// \param Brackets The range from the opening '[' to the closing ']'. 1306/// 1307/// \param Entity The name of the entity that involves the array 1308/// type, if known. 1309/// 1310/// \returns A suitable array type, if there are no errors. Otherwise, 1311/// returns a NULL type. 1312QualType Sema::BuildArrayType(QualType T, ArrayType::ArraySizeModifier ASM, 1313 Expr *ArraySize, unsigned Quals, 1314 SourceRange Brackets, DeclarationName Entity) { 1315 1316 SourceLocation Loc = Brackets.getBegin(); 1317 if (getLangOpts().CPlusPlus) { 1318 // C++ [dcl.array]p1: 1319 // T is called the array element type; this type shall not be a reference 1320 // type, the (possibly cv-qualified) type void, a function type or an 1321 // abstract class type. 1322 // 1323 // C++ [dcl.array]p3: 1324 // When several "array of" specifications are adjacent, [...] only the 1325 // first of the constant expressions that specify the bounds of the arrays 1326 // may be omitted. 1327 // 1328 // Note: function types are handled in the common path with C. 1329 if (T->isReferenceType()) { 1330 Diag(Loc, diag::err_illegal_decl_array_of_references) 1331 << getPrintableNameForEntity(Entity) << T; 1332 return QualType(); 1333 } 1334 1335 if (T->isVoidType() || T->isIncompleteArrayType()) { 1336 Diag(Loc, diag::err_illegal_decl_array_incomplete_type) << T; 1337 return QualType(); 1338 } 1339 1340 if (RequireNonAbstractType(Brackets.getBegin(), T, 1341 diag::err_array_of_abstract_type)) 1342 return QualType(); 1343 1344 } else { 1345 // C99 6.7.5.2p1: If the element type is an incomplete or function type, 1346 // reject it (e.g. void ary[7], struct foo ary[7], void ary[7]()) 1347 if (RequireCompleteType(Loc, T, 1348 diag::err_illegal_decl_array_incomplete_type)) 1349 return QualType(); 1350 } 1351 1352 if (T->isFunctionType()) { 1353 Diag(Loc, diag::err_illegal_decl_array_of_functions) 1354 << getPrintableNameForEntity(Entity) << T; 1355 return QualType(); 1356 } 1357 1358 if (T->getContainedAutoType()) { 1359 Diag(Loc, diag::err_illegal_decl_array_of_auto) 1360 << getPrintableNameForEntity(Entity) << T; 1361 return QualType(); 1362 } 1363 1364 if (const RecordType *EltTy = T->getAs<RecordType>()) { 1365 // If the element type is a struct or union that contains a variadic 1366 // array, accept it as a GNU extension: C99 6.7.2.1p2. 1367 if (EltTy->getDecl()->hasFlexibleArrayMember()) 1368 Diag(Loc, diag::ext_flexible_array_in_array) << T; 1369 } else if (T->isObjCObjectType()) { 1370 Diag(Loc, diag::err_objc_array_of_interfaces) << T; 1371 return QualType(); 1372 } 1373 1374 // Do placeholder conversions on the array size expression. 1375 if (ArraySize && ArraySize->hasPlaceholderType()) { 1376 ExprResult Result = CheckPlaceholderExpr(ArraySize); 1377 if (Result.isInvalid()) return QualType(); 1378 ArraySize = Result.take(); 1379 } 1380 1381 // Do lvalue-to-rvalue conversions on the array size expression. 1382 if (ArraySize && !ArraySize->isRValue()) { 1383 ExprResult Result = DefaultLvalueConversion(ArraySize); 1384 if (Result.isInvalid()) 1385 return QualType(); 1386 1387 ArraySize = Result.take(); 1388 } 1389 1390 // C99 6.7.5.2p1: The size expression shall have integer type. 1391 // C++11 allows contextual conversions to such types. 1392 if (!getLangOpts().CPlusPlus11 && 1393 ArraySize && !ArraySize->isTypeDependent() && 1394 !ArraySize->getType()->isIntegralOrUnscopedEnumerationType()) { 1395 Diag(ArraySize->getLocStart(), diag::err_array_size_non_int) 1396 << ArraySize->getType() << ArraySize->getSourceRange(); 1397 return QualType(); 1398 } 1399 1400 llvm::APSInt ConstVal(Context.getTypeSize(Context.getSizeType())); 1401 if (!ArraySize) { 1402 if (ASM == ArrayType::Star) 1403 T = Context.getVariableArrayType(T, 0, ASM, Quals, Brackets); 1404 else 1405 T = Context.getIncompleteArrayType(T, ASM, Quals); 1406 } else if (ArraySize->isTypeDependent() || ArraySize->isValueDependent()) { 1407 T = Context.getDependentSizedArrayType(T, ArraySize, ASM, Quals, Brackets); 1408 } else if ((!T->isDependentType() && !T->isIncompleteType() && 1409 !T->isConstantSizeType()) || 1410 isArraySizeVLA(*this, ArraySize, ConstVal)) { 1411 // Even in C++11, don't allow contextual conversions in the array bound 1412 // of a VLA. 1413 if (getLangOpts().CPlusPlus11 && 1414 !ArraySize->getType()->isIntegralOrUnscopedEnumerationType()) { 1415 Diag(ArraySize->getLocStart(), diag::err_array_size_non_int) 1416 << ArraySize->getType() << ArraySize->getSourceRange(); 1417 return QualType(); 1418 } 1419 1420 // C99: an array with an element type that has a non-constant-size is a VLA. 1421 // C99: an array with a non-ICE size is a VLA. We accept any expression 1422 // that we can fold to a non-zero positive value as an extension. 1423 T = Context.getVariableArrayType(T, ArraySize, ASM, Quals, Brackets); 1424 } else { 1425 // C99 6.7.5.2p1: If the expression is a constant expression, it shall 1426 // have a value greater than zero. 1427 if (ConstVal.isSigned() && ConstVal.isNegative()) { 1428 if (Entity) 1429 Diag(ArraySize->getLocStart(), diag::err_decl_negative_array_size) 1430 << getPrintableNameForEntity(Entity) << ArraySize->getSourceRange(); 1431 else 1432 Diag(ArraySize->getLocStart(), diag::err_typecheck_negative_array_size) 1433 << ArraySize->getSourceRange(); 1434 return QualType(); 1435 } 1436 if (ConstVal == 0) { 1437 // GCC accepts zero sized static arrays. We allow them when 1438 // we're not in a SFINAE context. 1439 Diag(ArraySize->getLocStart(), 1440 isSFINAEContext()? diag::err_typecheck_zero_array_size 1441 : diag::ext_typecheck_zero_array_size) 1442 << ArraySize->getSourceRange(); 1443 1444 if (ASM == ArrayType::Static) { 1445 Diag(ArraySize->getLocStart(), 1446 diag::warn_typecheck_zero_static_array_size) 1447 << ArraySize->getSourceRange(); 1448 ASM = ArrayType::Normal; 1449 } 1450 } else if (!T->isDependentType() && !T->isVariablyModifiedType() && 1451 !T->isIncompleteType()) { 1452 // Is the array too large? 1453 unsigned ActiveSizeBits 1454 = ConstantArrayType::getNumAddressingBits(Context, T, ConstVal); 1455 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) 1456 Diag(ArraySize->getLocStart(), diag::err_array_too_large) 1457 << ConstVal.toString(10) 1458 << ArraySize->getSourceRange(); 1459 } 1460 1461 T = Context.getConstantArrayType(T, ConstVal, ASM, Quals); 1462 } 1463 1464 // OpenCL v1.2 s6.9.d: variable length arrays are not supported. 1465 if (getLangOpts().OpenCL && T->isVariableArrayType()) { 1466 Diag(Loc, diag::err_opencl_vla); 1467 return QualType(); 1468 } 1469 // If this is not C99, extwarn about VLA's and C99 array size modifiers. 1470 if (!getLangOpts().C99) { 1471 if (T->isVariableArrayType()) { 1472 // Prohibit the use of non-POD types in VLAs. 1473 QualType BaseT = Context.getBaseElementType(T); 1474 if (!T->isDependentType() && 1475 !BaseT.isPODType(Context) && 1476 !BaseT->isObjCLifetimeType()) { 1477 Diag(Loc, diag::err_vla_non_pod) 1478 << BaseT; 1479 return QualType(); 1480 } 1481 // Prohibit the use of VLAs during template argument deduction. 1482 else if (isSFINAEContext()) { 1483 Diag(Loc, diag::err_vla_in_sfinae); 1484 return QualType(); 1485 } 1486 // Just extwarn about VLAs. 1487 else 1488 Diag(Loc, diag::ext_vla); 1489 } else if (ASM != ArrayType::Normal || Quals != 0) 1490 Diag(Loc, 1491 getLangOpts().CPlusPlus? diag::err_c99_array_usage_cxx 1492 : diag::ext_c99_array_usage) << ASM; 1493 } 1494 1495 return T; 1496} 1497 1498/// \brief Build an ext-vector type. 1499/// 1500/// Run the required checks for the extended vector type. 1501QualType Sema::BuildExtVectorType(QualType T, Expr *ArraySize, 1502 SourceLocation AttrLoc) { 1503 // unlike gcc's vector_size attribute, we do not allow vectors to be defined 1504 // in conjunction with complex types (pointers, arrays, functions, etc.). 1505 if (!T->isDependentType() && 1506 !T->isIntegerType() && !T->isRealFloatingType()) { 1507 Diag(AttrLoc, diag::err_attribute_invalid_vector_type) << T; 1508 return QualType(); 1509 } 1510 1511 if (!ArraySize->isTypeDependent() && !ArraySize->isValueDependent()) { 1512 llvm::APSInt vecSize(32); 1513 if (!ArraySize->isIntegerConstantExpr(vecSize, Context)) { 1514 Diag(AttrLoc, diag::err_attribute_argument_not_int) 1515 << "ext_vector_type" << ArraySize->getSourceRange(); 1516 return QualType(); 1517 } 1518 1519 // unlike gcc's vector_size attribute, the size is specified as the 1520 // number of elements, not the number of bytes. 1521 unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue()); 1522 1523 if (vectorSize == 0) { 1524 Diag(AttrLoc, diag::err_attribute_zero_size) 1525 << ArraySize->getSourceRange(); 1526 return QualType(); 1527 } 1528 1529 return Context.getExtVectorType(T, vectorSize); 1530 } 1531 1532 return Context.getDependentSizedExtVectorType(T, ArraySize, AttrLoc); 1533} 1534 1535/// \brief Build a function type. 1536/// 1537/// This routine checks the function type according to C++ rules and 1538/// under the assumption that the result type and parameter types have 1539/// just been instantiated from a template. It therefore duplicates 1540/// some of the behavior of GetTypeForDeclarator, but in a much 1541/// simpler form that is only suitable for this narrow use case. 1542/// 1543/// \param T The return type of the function. 1544/// 1545/// \param ParamTypes The parameter types of the function. This array 1546/// will be modified to account for adjustments to the types of the 1547/// function parameters. 1548/// 1549/// \param NumParamTypes The number of parameter types in ParamTypes. 1550/// 1551/// \param Variadic Whether this is a variadic function type. 1552/// 1553/// \param HasTrailingReturn Whether this function has a trailing return type. 1554/// 1555/// \param Quals The cvr-qualifiers to be applied to the function type. 1556/// 1557/// \param Loc The location of the entity whose type involves this 1558/// function type or, if there is no such entity, the location of the 1559/// type that will have function type. 1560/// 1561/// \param Entity The name of the entity that involves the function 1562/// type, if known. 1563/// 1564/// \returns A suitable function type, if there are no 1565/// errors. Otherwise, returns a NULL type. 1566QualType Sema::BuildFunctionType(QualType T, 1567 QualType *ParamTypes, 1568 unsigned NumParamTypes, 1569 bool Variadic, bool HasTrailingReturn, 1570 unsigned Quals, 1571 RefQualifierKind RefQualifier, 1572 SourceLocation Loc, DeclarationName Entity, 1573 FunctionType::ExtInfo Info) { 1574 if (T->isArrayType() || T->isFunctionType()) { 1575 Diag(Loc, diag::err_func_returning_array_function) 1576 << T->isFunctionType() << T; 1577 return QualType(); 1578 } 1579 1580 // Functions cannot return half FP. 1581 if (T->isHalfType()) { 1582 Diag(Loc, diag::err_parameters_retval_cannot_have_fp16_type) << 1 << 1583 FixItHint::CreateInsertion(Loc, "*"); 1584 return QualType(); 1585 } 1586 1587 bool Invalid = false; 1588 for (unsigned Idx = 0; Idx < NumParamTypes; ++Idx) { 1589 // FIXME: Loc is too inprecise here, should use proper locations for args. 1590 QualType ParamType = Context.getAdjustedParameterType(ParamTypes[Idx]); 1591 if (ParamType->isVoidType()) { 1592 Diag(Loc, diag::err_param_with_void_type); 1593 Invalid = true; 1594 } else if (ParamType->isHalfType()) { 1595 // Disallow half FP arguments. 1596 Diag(Loc, diag::err_parameters_retval_cannot_have_fp16_type) << 0 << 1597 FixItHint::CreateInsertion(Loc, "*"); 1598 Invalid = true; 1599 } 1600 1601 ParamTypes[Idx] = ParamType; 1602 } 1603 1604 if (Invalid) 1605 return QualType(); 1606 1607 FunctionProtoType::ExtProtoInfo EPI; 1608 EPI.Variadic = Variadic; 1609 EPI.HasTrailingReturn = HasTrailingReturn; 1610 EPI.TypeQuals = Quals; 1611 EPI.RefQualifier = RefQualifier; 1612 EPI.ExtInfo = Info; 1613 1614 return Context.getFunctionType(T, ParamTypes, NumParamTypes, EPI); 1615} 1616 1617/// \brief Build a member pointer type \c T Class::*. 1618/// 1619/// \param T the type to which the member pointer refers. 1620/// \param Class the class type into which the member pointer points. 1621/// \param Loc the location where this type begins 1622/// \param Entity the name of the entity that will have this member pointer type 1623/// 1624/// \returns a member pointer type, if successful, or a NULL type if there was 1625/// an error. 1626QualType Sema::BuildMemberPointerType(QualType T, QualType Class, 1627 SourceLocation Loc, 1628 DeclarationName Entity) { 1629 // Verify that we're not building a pointer to pointer to function with 1630 // exception specification. 1631 if (CheckDistantExceptionSpec(T)) { 1632 Diag(Loc, diag::err_distant_exception_spec); 1633 1634 // FIXME: If we're doing this as part of template instantiation, 1635 // we should return immediately. 1636 1637 // Build the type anyway, but use the canonical type so that the 1638 // exception specifiers are stripped off. 1639 T = Context.getCanonicalType(T); 1640 } 1641 1642 // C++ 8.3.3p3: A pointer to member shall not point to ... a member 1643 // with reference type, or "cv void." 1644 if (T->isReferenceType()) { 1645 Diag(Loc, diag::err_illegal_decl_mempointer_to_reference) 1646 << (Entity? Entity.getAsString() : "type name") << T; 1647 return QualType(); 1648 } 1649 1650 if (T->isVoidType()) { 1651 Diag(Loc, diag::err_illegal_decl_mempointer_to_void) 1652 << (Entity? Entity.getAsString() : "type name"); 1653 return QualType(); 1654 } 1655 1656 if (!Class->isDependentType() && !Class->isRecordType()) { 1657 Diag(Loc, diag::err_mempointer_in_nonclass_type) << Class; 1658 return QualType(); 1659 } 1660 1661 // In the Microsoft ABI, the class is allowed to be an incomplete 1662 // type. In such cases, the compiler makes a worst-case assumption. 1663 // We make no such assumption right now, so emit an error if the 1664 // class isn't a complete type. 1665 if (Context.getTargetInfo().getCXXABI() == CXXABI_Microsoft && 1666 RequireCompleteType(Loc, Class, diag::err_incomplete_type)) 1667 return QualType(); 1668 1669 return Context.getMemberPointerType(T, Class.getTypePtr()); 1670} 1671 1672/// \brief Build a block pointer type. 1673/// 1674/// \param T The type to which we'll be building a block pointer. 1675/// 1676/// \param Loc The source location, used for diagnostics. 1677/// 1678/// \param Entity The name of the entity that involves the block pointer 1679/// type, if known. 1680/// 1681/// \returns A suitable block pointer type, if there are no 1682/// errors. Otherwise, returns a NULL type. 1683QualType Sema::BuildBlockPointerType(QualType T, 1684 SourceLocation Loc, 1685 DeclarationName Entity) { 1686 if (!T->isFunctionType()) { 1687 Diag(Loc, diag::err_nonfunction_block_type); 1688 return QualType(); 1689 } 1690 1691 return Context.getBlockPointerType(T); 1692} 1693 1694QualType Sema::GetTypeFromParser(ParsedType Ty, TypeSourceInfo **TInfo) { 1695 QualType QT = Ty.get(); 1696 if (QT.isNull()) { 1697 if (TInfo) *TInfo = 0; 1698 return QualType(); 1699 } 1700 1701 TypeSourceInfo *DI = 0; 1702 if (const LocInfoType *LIT = dyn_cast<LocInfoType>(QT)) { 1703 QT = LIT->getType(); 1704 DI = LIT->getTypeSourceInfo(); 1705 } 1706 1707 if (TInfo) *TInfo = DI; 1708 return QT; 1709} 1710 1711static void transferARCOwnershipToDeclaratorChunk(TypeProcessingState &state, 1712 Qualifiers::ObjCLifetime ownership, 1713 unsigned chunkIndex); 1714 1715/// Given that this is the declaration of a parameter under ARC, 1716/// attempt to infer attributes and such for pointer-to-whatever 1717/// types. 1718static void inferARCWriteback(TypeProcessingState &state, 1719 QualType &declSpecType) { 1720 Sema &S = state.getSema(); 1721 Declarator &declarator = state.getDeclarator(); 1722 1723 // TODO: should we care about decl qualifiers? 1724 1725 // Check whether the declarator has the expected form. We walk 1726 // from the inside out in order to make the block logic work. 1727 unsigned outermostPointerIndex = 0; 1728 bool isBlockPointer = false; 1729 unsigned numPointers = 0; 1730 for (unsigned i = 0, e = declarator.getNumTypeObjects(); i != e; ++i) { 1731 unsigned chunkIndex = i; 1732 DeclaratorChunk &chunk = declarator.getTypeObject(chunkIndex); 1733 switch (chunk.Kind) { 1734 case DeclaratorChunk::Paren: 1735 // Ignore parens. 1736 break; 1737 1738 case DeclaratorChunk::Reference: 1739 case DeclaratorChunk::Pointer: 1740 // Count the number of pointers. Treat references 1741 // interchangeably as pointers; if they're mis-ordered, normal 1742 // type building will discover that. 1743 outermostPointerIndex = chunkIndex; 1744 numPointers++; 1745 break; 1746 1747 case DeclaratorChunk::BlockPointer: 1748 // If we have a pointer to block pointer, that's an acceptable 1749 // indirect reference; anything else is not an application of 1750 // the rules. 1751 if (numPointers != 1) return; 1752 numPointers++; 1753 outermostPointerIndex = chunkIndex; 1754 isBlockPointer = true; 1755 1756 // We don't care about pointer structure in return values here. 1757 goto done; 1758 1759 case DeclaratorChunk::Array: // suppress if written (id[])? 1760 case DeclaratorChunk::Function: 1761 case DeclaratorChunk::MemberPointer: 1762 return; 1763 } 1764 } 1765 done: 1766 1767 // If we have *one* pointer, then we want to throw the qualifier on 1768 // the declaration-specifiers, which means that it needs to be a 1769 // retainable object type. 1770 if (numPointers == 1) { 1771 // If it's not a retainable object type, the rule doesn't apply. 1772 if (!declSpecType->isObjCRetainableType()) return; 1773 1774 // If it already has lifetime, don't do anything. 1775 if (declSpecType.getObjCLifetime()) return; 1776 1777 // Otherwise, modify the type in-place. 1778 Qualifiers qs; 1779 1780 if (declSpecType->isObjCARCImplicitlyUnretainedType()) 1781 qs.addObjCLifetime(Qualifiers::OCL_ExplicitNone); 1782 else 1783 qs.addObjCLifetime(Qualifiers::OCL_Autoreleasing); 1784 declSpecType = S.Context.getQualifiedType(declSpecType, qs); 1785 1786 // If we have *two* pointers, then we want to throw the qualifier on 1787 // the outermost pointer. 1788 } else if (numPointers == 2) { 1789 // If we don't have a block pointer, we need to check whether the 1790 // declaration-specifiers gave us something that will turn into a 1791 // retainable object pointer after we slap the first pointer on it. 1792 if (!isBlockPointer && !declSpecType->isObjCObjectType()) 1793 return; 1794 1795 // Look for an explicit lifetime attribute there. 1796 DeclaratorChunk &chunk = declarator.getTypeObject(outermostPointerIndex); 1797 if (chunk.Kind != DeclaratorChunk::Pointer && 1798 chunk.Kind != DeclaratorChunk::BlockPointer) 1799 return; 1800 for (const AttributeList *attr = chunk.getAttrs(); attr; 1801 attr = attr->getNext()) 1802 if (attr->getKind() == AttributeList::AT_ObjCOwnership) 1803 return; 1804 1805 transferARCOwnershipToDeclaratorChunk(state, Qualifiers::OCL_Autoreleasing, 1806 outermostPointerIndex); 1807 1808 // Any other number of pointers/references does not trigger the rule. 1809 } else return; 1810 1811 // TODO: mark whether we did this inference? 1812} 1813 1814static void DiagnoseIgnoredQualifiers(unsigned Quals, 1815 SourceLocation ConstQualLoc, 1816 SourceLocation VolatileQualLoc, 1817 SourceLocation RestrictQualLoc, 1818 Sema& S) { 1819 std::string QualStr; 1820 unsigned NumQuals = 0; 1821 SourceLocation Loc; 1822 1823 FixItHint ConstFixIt; 1824 FixItHint VolatileFixIt; 1825 FixItHint RestrictFixIt; 1826 1827 const SourceManager &SM = S.getSourceManager(); 1828 1829 // FIXME: The locations here are set kind of arbitrarily. It'd be nicer to 1830 // find a range and grow it to encompass all the qualifiers, regardless of 1831 // the order in which they textually appear. 1832 if (Quals & Qualifiers::Const) { 1833 ConstFixIt = FixItHint::CreateRemoval(ConstQualLoc); 1834 QualStr = "const"; 1835 ++NumQuals; 1836 if (!Loc.isValid() || SM.isBeforeInTranslationUnit(ConstQualLoc, Loc)) 1837 Loc = ConstQualLoc; 1838 } 1839 if (Quals & Qualifiers::Volatile) { 1840 VolatileFixIt = FixItHint::CreateRemoval(VolatileQualLoc); 1841 QualStr += (NumQuals == 0 ? "volatile" : " volatile"); 1842 ++NumQuals; 1843 if (!Loc.isValid() || SM.isBeforeInTranslationUnit(VolatileQualLoc, Loc)) 1844 Loc = VolatileQualLoc; 1845 } 1846 if (Quals & Qualifiers::Restrict) { 1847 RestrictFixIt = FixItHint::CreateRemoval(RestrictQualLoc); 1848 QualStr += (NumQuals == 0 ? "restrict" : " restrict"); 1849 ++NumQuals; 1850 if (!Loc.isValid() || SM.isBeforeInTranslationUnit(RestrictQualLoc, Loc)) 1851 Loc = RestrictQualLoc; 1852 } 1853 1854 assert(NumQuals > 0 && "No known qualifiers?"); 1855 1856 S.Diag(Loc, diag::warn_qual_return_type) 1857 << QualStr << NumQuals << ConstFixIt << VolatileFixIt << RestrictFixIt; 1858} 1859 1860static QualType GetDeclSpecTypeForDeclarator(TypeProcessingState &state, 1861 TypeSourceInfo *&ReturnTypeInfo) { 1862 Sema &SemaRef = state.getSema(); 1863 Declarator &D = state.getDeclarator(); 1864 QualType T; 1865 ReturnTypeInfo = 0; 1866 1867 // The TagDecl owned by the DeclSpec. 1868 TagDecl *OwnedTagDecl = 0; 1869 1870 switch (D.getName().getKind()) { 1871 case UnqualifiedId::IK_ImplicitSelfParam: 1872 case UnqualifiedId::IK_OperatorFunctionId: 1873 case UnqualifiedId::IK_Identifier: 1874 case UnqualifiedId::IK_LiteralOperatorId: 1875 case UnqualifiedId::IK_TemplateId: 1876 T = ConvertDeclSpecToType(state); 1877 1878 if (!D.isInvalidType() && D.getDeclSpec().isTypeSpecOwned()) { 1879 OwnedTagDecl = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 1880 // Owned declaration is embedded in declarator. 1881 OwnedTagDecl->setEmbeddedInDeclarator(true); 1882 } 1883 break; 1884 1885 case UnqualifiedId::IK_ConstructorName: 1886 case UnqualifiedId::IK_ConstructorTemplateId: 1887 case UnqualifiedId::IK_DestructorName: 1888 // Constructors and destructors don't have return types. Use 1889 // "void" instead. 1890 T = SemaRef.Context.VoidTy; 1891 if (AttributeList *attrs = D.getDeclSpec().getAttributes().getList()) 1892 processTypeAttrs(state, T, TAL_DeclSpec, attrs); 1893 break; 1894 1895 case UnqualifiedId::IK_ConversionFunctionId: 1896 // The result type of a conversion function is the type that it 1897 // converts to. 1898 T = SemaRef.GetTypeFromParser(D.getName().ConversionFunctionId, 1899 &ReturnTypeInfo); 1900 break; 1901 } 1902 1903 if (D.getAttributes()) 1904 distributeTypeAttrsFromDeclarator(state, T); 1905 1906 // C++11 [dcl.spec.auto]p5: reject 'auto' if it is not in an allowed context. 1907 // In C++11, a function declarator using 'auto' must have a trailing return 1908 // type (this is checked later) and we can skip this. In other languages 1909 // using auto, we need to check regardless. 1910 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto && 1911 (!SemaRef.getLangOpts().CPlusPlus11 || !D.isFunctionDeclarator())) { 1912 int Error = -1; 1913 1914 switch (D.getContext()) { 1915 case Declarator::KNRTypeListContext: 1916 llvm_unreachable("K&R type lists aren't allowed in C++"); 1917 case Declarator::LambdaExprContext: 1918 llvm_unreachable("Can't specify a type specifier in lambda grammar"); 1919 case Declarator::ObjCParameterContext: 1920 case Declarator::ObjCResultContext: 1921 case Declarator::PrototypeContext: 1922 Error = 0; // Function prototype 1923 break; 1924 case Declarator::MemberContext: 1925 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_static) 1926 break; 1927 switch (cast<TagDecl>(SemaRef.CurContext)->getTagKind()) { 1928 case TTK_Enum: llvm_unreachable("unhandled tag kind"); 1929 case TTK_Struct: Error = 1; /* Struct member */ break; 1930 case TTK_Union: Error = 2; /* Union member */ break; 1931 case TTK_Class: Error = 3; /* Class member */ break; 1932 case TTK_Interface: Error = 4; /* Interface member */ break; 1933 } 1934 break; 1935 case Declarator::CXXCatchContext: 1936 case Declarator::ObjCCatchContext: 1937 Error = 5; // Exception declaration 1938 break; 1939 case Declarator::TemplateParamContext: 1940 Error = 6; // Template parameter 1941 break; 1942 case Declarator::BlockLiteralContext: 1943 Error = 7; // Block literal 1944 break; 1945 case Declarator::TemplateTypeArgContext: 1946 Error = 8; // Template type argument 1947 break; 1948 case Declarator::AliasDeclContext: 1949 case Declarator::AliasTemplateContext: 1950 Error = 10; // Type alias 1951 break; 1952 case Declarator::TrailingReturnContext: 1953 Error = 11; // Function return type 1954 break; 1955 case Declarator::TypeNameContext: 1956 Error = 12; // Generic 1957 break; 1958 case Declarator::FileContext: 1959 case Declarator::BlockContext: 1960 case Declarator::ForContext: 1961 case Declarator::ConditionContext: 1962 case Declarator::CXXNewContext: 1963 break; 1964 } 1965 1966 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 1967 Error = 9; 1968 1969 // In Objective-C it is an error to use 'auto' on a function declarator. 1970 if (D.isFunctionDeclarator()) 1971 Error = 11; 1972 1973 // C++11 [dcl.spec.auto]p2: 'auto' is always fine if the declarator 1974 // contains a trailing return type. That is only legal at the outermost 1975 // level. Check all declarator chunks (outermost first) anyway, to give 1976 // better diagnostics. 1977 if (SemaRef.getLangOpts().CPlusPlus11 && Error != -1) { 1978 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 1979 unsigned chunkIndex = e - i - 1; 1980 state.setCurrentChunkIndex(chunkIndex); 1981 DeclaratorChunk &DeclType = D.getTypeObject(chunkIndex); 1982 if (DeclType.Kind == DeclaratorChunk::Function) { 1983 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun; 1984 if (FTI.hasTrailingReturnType()) { 1985 Error = -1; 1986 break; 1987 } 1988 } 1989 } 1990 } 1991 1992 if (Error != -1) { 1993 SemaRef.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 1994 diag::err_auto_not_allowed) 1995 << Error; 1996 T = SemaRef.Context.IntTy; 1997 D.setInvalidType(true); 1998 } else 1999 SemaRef.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 2000 diag::warn_cxx98_compat_auto_type_specifier); 2001 } 2002 2003 if (SemaRef.getLangOpts().CPlusPlus && 2004 OwnedTagDecl && OwnedTagDecl->isCompleteDefinition()) { 2005 // Check the contexts where C++ forbids the declaration of a new class 2006 // or enumeration in a type-specifier-seq. 2007 switch (D.getContext()) { 2008 case Declarator::TrailingReturnContext: 2009 // Class and enumeration definitions are syntactically not allowed in 2010 // trailing return types. 2011 llvm_unreachable("parser should not have allowed this"); 2012 break; 2013 case Declarator::FileContext: 2014 case Declarator::MemberContext: 2015 case Declarator::BlockContext: 2016 case Declarator::ForContext: 2017 case Declarator::BlockLiteralContext: 2018 case Declarator::LambdaExprContext: 2019 // C++11 [dcl.type]p3: 2020 // A type-specifier-seq shall not define a class or enumeration unless 2021 // it appears in the type-id of an alias-declaration (7.1.3) that is not 2022 // the declaration of a template-declaration. 2023 case Declarator::AliasDeclContext: 2024 break; 2025 case Declarator::AliasTemplateContext: 2026 SemaRef.Diag(OwnedTagDecl->getLocation(), 2027 diag::err_type_defined_in_alias_template) 2028 << SemaRef.Context.getTypeDeclType(OwnedTagDecl); 2029 D.setInvalidType(true); 2030 break; 2031 case Declarator::TypeNameContext: 2032 case Declarator::TemplateParamContext: 2033 case Declarator::CXXNewContext: 2034 case Declarator::CXXCatchContext: 2035 case Declarator::ObjCCatchContext: 2036 case Declarator::TemplateTypeArgContext: 2037 SemaRef.Diag(OwnedTagDecl->getLocation(), 2038 diag::err_type_defined_in_type_specifier) 2039 << SemaRef.Context.getTypeDeclType(OwnedTagDecl); 2040 D.setInvalidType(true); 2041 break; 2042 case Declarator::PrototypeContext: 2043 case Declarator::ObjCParameterContext: 2044 case Declarator::ObjCResultContext: 2045 case Declarator::KNRTypeListContext: 2046 // C++ [dcl.fct]p6: 2047 // Types shall not be defined in return or parameter types. 2048 SemaRef.Diag(OwnedTagDecl->getLocation(), 2049 diag::err_type_defined_in_param_type) 2050 << SemaRef.Context.getTypeDeclType(OwnedTagDecl); 2051 D.setInvalidType(true); 2052 break; 2053 case Declarator::ConditionContext: 2054 // C++ 6.4p2: 2055 // The type-specifier-seq shall not contain typedef and shall not declare 2056 // a new class or enumeration. 2057 SemaRef.Diag(OwnedTagDecl->getLocation(), 2058 diag::err_type_defined_in_condition); 2059 D.setInvalidType(true); 2060 break; 2061 } 2062 } 2063 2064 return T; 2065} 2066 2067static std::string getFunctionQualifiersAsString(const FunctionProtoType *FnTy){ 2068 std::string Quals = 2069 Qualifiers::fromCVRMask(FnTy->getTypeQuals()).getAsString(); 2070 2071 switch (FnTy->getRefQualifier()) { 2072 case RQ_None: 2073 break; 2074 2075 case RQ_LValue: 2076 if (!Quals.empty()) 2077 Quals += ' '; 2078 Quals += '&'; 2079 break; 2080 2081 case RQ_RValue: 2082 if (!Quals.empty()) 2083 Quals += ' '; 2084 Quals += "&&"; 2085 break; 2086 } 2087 2088 return Quals; 2089} 2090 2091/// Check that the function type T, which has a cv-qualifier or a ref-qualifier, 2092/// can be contained within the declarator chunk DeclType, and produce an 2093/// appropriate diagnostic if not. 2094static void checkQualifiedFunction(Sema &S, QualType T, 2095 DeclaratorChunk &DeclType) { 2096 // C++98 [dcl.fct]p4 / C++11 [dcl.fct]p6: a function type with a 2097 // cv-qualifier or a ref-qualifier can only appear at the topmost level 2098 // of a type. 2099 int DiagKind = -1; 2100 switch (DeclType.Kind) { 2101 case DeclaratorChunk::Paren: 2102 case DeclaratorChunk::MemberPointer: 2103 // These cases are permitted. 2104 return; 2105 case DeclaratorChunk::Array: 2106 case DeclaratorChunk::Function: 2107 // These cases don't allow function types at all; no need to diagnose the 2108 // qualifiers separately. 2109 return; 2110 case DeclaratorChunk::BlockPointer: 2111 DiagKind = 0; 2112 break; 2113 case DeclaratorChunk::Pointer: 2114 DiagKind = 1; 2115 break; 2116 case DeclaratorChunk::Reference: 2117 DiagKind = 2; 2118 break; 2119 } 2120 2121 assert(DiagKind != -1); 2122 S.Diag(DeclType.Loc, diag::err_compound_qualified_function_type) 2123 << DiagKind << isa<FunctionType>(T.IgnoreParens()) << T 2124 << getFunctionQualifiersAsString(T->castAs<FunctionProtoType>()); 2125} 2126 2127/// Produce an approprioate diagnostic for an ambiguity between a function 2128/// declarator and a C++ direct-initializer. 2129static void warnAboutAmbiguousFunction(Sema &S, Declarator &D, 2130 DeclaratorChunk &DeclType, QualType RT) { 2131 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun; 2132 assert(FTI.isAmbiguous && "no direct-initializer / function ambiguity"); 2133 2134 // If the return type is void there is no ambiguity. 2135 if (RT->isVoidType()) 2136 return; 2137 2138 // An initializer for a non-class type can have at most one argument. 2139 if (!RT->isRecordType() && FTI.NumArgs > 1) 2140 return; 2141 2142 // An initializer for a reference must have exactly one argument. 2143 if (RT->isReferenceType() && FTI.NumArgs != 1) 2144 return; 2145 2146 // Only warn if this declarator is declaring a function at block scope, and 2147 // doesn't have a storage class (such as 'extern') specified. 2148 if (!D.isFunctionDeclarator() || 2149 D.getFunctionDefinitionKind() != FDK_Declaration || 2150 !S.CurContext->isFunctionOrMethod() || 2151 D.getDeclSpec().getStorageClassSpecAsWritten() 2152 != DeclSpec::SCS_unspecified) 2153 return; 2154 2155 // Inside a condition, a direct initializer is not permitted. We allow one to 2156 // be parsed in order to give better diagnostics in condition parsing. 2157 if (D.getContext() == Declarator::ConditionContext) 2158 return; 2159 2160 SourceRange ParenRange(DeclType.Loc, DeclType.EndLoc); 2161 2162 S.Diag(DeclType.Loc, 2163 FTI.NumArgs ? diag::warn_parens_disambiguated_as_function_declaration 2164 : diag::warn_empty_parens_are_function_decl) 2165 << ParenRange; 2166 2167 // If the declaration looks like: 2168 // T var1, 2169 // f(); 2170 // and name lookup finds a function named 'f', then the ',' was 2171 // probably intended to be a ';'. 2172 if (!D.isFirstDeclarator() && D.getIdentifier()) { 2173 FullSourceLoc Comma(D.getCommaLoc(), S.SourceMgr); 2174 FullSourceLoc Name(D.getIdentifierLoc(), S.SourceMgr); 2175 if (Comma.getFileID() != Name.getFileID() || 2176 Comma.getSpellingLineNumber() != Name.getSpellingLineNumber()) { 2177 LookupResult Result(S, D.getIdentifier(), SourceLocation(), 2178 Sema::LookupOrdinaryName); 2179 if (S.LookupName(Result, S.getCurScope())) 2180 S.Diag(D.getCommaLoc(), diag::note_empty_parens_function_call) 2181 << FixItHint::CreateReplacement(D.getCommaLoc(), ";") 2182 << D.getIdentifier(); 2183 } 2184 } 2185 2186 if (FTI.NumArgs > 0) { 2187 // For a declaration with parameters, eg. "T var(T());", suggest adding parens 2188 // around the first parameter to turn the declaration into a variable 2189 // declaration. 2190 SourceRange Range = FTI.ArgInfo[0].Param->getSourceRange(); 2191 SourceLocation B = Range.getBegin(); 2192 SourceLocation E = S.PP.getLocForEndOfToken(Range.getEnd()); 2193 // FIXME: Maybe we should suggest adding braces instead of parens 2194 // in C++11 for classes that don't have an initializer_list constructor. 2195 S.Diag(B, diag::note_additional_parens_for_variable_declaration) 2196 << FixItHint::CreateInsertion(B, "(") 2197 << FixItHint::CreateInsertion(E, ")"); 2198 } else { 2199 // For a declaration without parameters, eg. "T var();", suggest replacing the 2200 // parens with an initializer to turn the declaration into a variable 2201 // declaration. 2202 const CXXRecordDecl *RD = RT->getAsCXXRecordDecl(); 2203 2204 // Empty parens mean value-initialization, and no parens mean 2205 // default initialization. These are equivalent if the default 2206 // constructor is user-provided or if zero-initialization is a 2207 // no-op. 2208 if (RD && RD->hasDefinition() && 2209 (RD->isEmpty() || RD->hasUserProvidedDefaultConstructor())) 2210 S.Diag(DeclType.Loc, diag::note_empty_parens_default_ctor) 2211 << FixItHint::CreateRemoval(ParenRange); 2212 else { 2213 std::string Init = S.getFixItZeroInitializerForType(RT); 2214 if (Init.empty() && S.LangOpts.CPlusPlus11) 2215 Init = "{}"; 2216 if (!Init.empty()) 2217 S.Diag(DeclType.Loc, diag::note_empty_parens_zero_initialize) 2218 << FixItHint::CreateReplacement(ParenRange, Init); 2219 } 2220 } 2221} 2222 2223static TypeSourceInfo *GetFullTypeForDeclarator(TypeProcessingState &state, 2224 QualType declSpecType, 2225 TypeSourceInfo *TInfo) { 2226 2227 QualType T = declSpecType; 2228 Declarator &D = state.getDeclarator(); 2229 Sema &S = state.getSema(); 2230 ASTContext &Context = S.Context; 2231 const LangOptions &LangOpts = S.getLangOpts(); 2232 2233 // The name we're declaring, if any. 2234 DeclarationName Name; 2235 if (D.getIdentifier()) 2236 Name = D.getIdentifier(); 2237 2238 // Does this declaration declare a typedef-name? 2239 bool IsTypedefName = 2240 D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef || 2241 D.getContext() == Declarator::AliasDeclContext || 2242 D.getContext() == Declarator::AliasTemplateContext; 2243 2244 // Does T refer to a function type with a cv-qualifier or a ref-qualifier? 2245 bool IsQualifiedFunction = T->isFunctionProtoType() && 2246 (T->castAs<FunctionProtoType>()->getTypeQuals() != 0 || 2247 T->castAs<FunctionProtoType>()->getRefQualifier() != RQ_None); 2248 2249 // Walk the DeclTypeInfo, building the recursive type as we go. 2250 // DeclTypeInfos are ordered from the identifier out, which is 2251 // opposite of what we want :). 2252 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 2253 unsigned chunkIndex = e - i - 1; 2254 state.setCurrentChunkIndex(chunkIndex); 2255 DeclaratorChunk &DeclType = D.getTypeObject(chunkIndex); 2256 if (IsQualifiedFunction) { 2257 checkQualifiedFunction(S, T, DeclType); 2258 IsQualifiedFunction = DeclType.Kind == DeclaratorChunk::Paren; 2259 } 2260 switch (DeclType.Kind) { 2261 case DeclaratorChunk::Paren: 2262 T = S.BuildParenType(T); 2263 break; 2264 case DeclaratorChunk::BlockPointer: 2265 // If blocks are disabled, emit an error. 2266 if (!LangOpts.Blocks) 2267 S.Diag(DeclType.Loc, diag::err_blocks_disable); 2268 2269 T = S.BuildBlockPointerType(T, D.getIdentifierLoc(), Name); 2270 if (DeclType.Cls.TypeQuals) 2271 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Cls.TypeQuals); 2272 break; 2273 case DeclaratorChunk::Pointer: 2274 // Verify that we're not building a pointer to pointer to function with 2275 // exception specification. 2276 if (LangOpts.CPlusPlus && S.CheckDistantExceptionSpec(T)) { 2277 S.Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 2278 D.setInvalidType(true); 2279 // Build the type anyway. 2280 } 2281 if (LangOpts.ObjC1 && T->getAs<ObjCObjectType>()) { 2282 T = Context.getObjCObjectPointerType(T); 2283 if (DeclType.Ptr.TypeQuals) 2284 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Ptr.TypeQuals); 2285 break; 2286 } 2287 T = S.BuildPointerType(T, DeclType.Loc, Name); 2288 if (DeclType.Ptr.TypeQuals) 2289 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Ptr.TypeQuals); 2290 2291 break; 2292 case DeclaratorChunk::Reference: { 2293 // Verify that we're not building a reference to pointer to function with 2294 // exception specification. 2295 if (LangOpts.CPlusPlus && S.CheckDistantExceptionSpec(T)) { 2296 S.Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 2297 D.setInvalidType(true); 2298 // Build the type anyway. 2299 } 2300 T = S.BuildReferenceType(T, DeclType.Ref.LValueRef, DeclType.Loc, Name); 2301 2302 Qualifiers Quals; 2303 if (DeclType.Ref.HasRestrict) 2304 T = S.BuildQualifiedType(T, DeclType.Loc, Qualifiers::Restrict); 2305 break; 2306 } 2307 case DeclaratorChunk::Array: { 2308 // Verify that we're not building an array of pointers to function with 2309 // exception specification. 2310 if (LangOpts.CPlusPlus && S.CheckDistantExceptionSpec(T)) { 2311 S.Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 2312 D.setInvalidType(true); 2313 // Build the type anyway. 2314 } 2315 DeclaratorChunk::ArrayTypeInfo &ATI = DeclType.Arr; 2316 Expr *ArraySize = static_cast<Expr*>(ATI.NumElts); 2317 ArrayType::ArraySizeModifier ASM; 2318 if (ATI.isStar) 2319 ASM = ArrayType::Star; 2320 else if (ATI.hasStatic) 2321 ASM = ArrayType::Static; 2322 else 2323 ASM = ArrayType::Normal; 2324 if (ASM == ArrayType::Star && !D.isPrototypeContext()) { 2325 // FIXME: This check isn't quite right: it allows star in prototypes 2326 // for function definitions, and disallows some edge cases detailed 2327 // in http://gcc.gnu.org/ml/gcc-patches/2009-02/msg00133.html 2328 S.Diag(DeclType.Loc, diag::err_array_star_outside_prototype); 2329 ASM = ArrayType::Normal; 2330 D.setInvalidType(true); 2331 } 2332 2333 // C99 6.7.5.2p1: The optional type qualifiers and the keyword static 2334 // shall appear only in a declaration of a function parameter with an 2335 // array type, ... 2336 if (ASM == ArrayType::Static || ATI.TypeQuals) { 2337 if (!(D.isPrototypeContext() || 2338 D.getContext() == Declarator::KNRTypeListContext)) { 2339 S.Diag(DeclType.Loc, diag::err_array_static_outside_prototype) << 2340 (ASM == ArrayType::Static ? "'static'" : "type qualifier"); 2341 // Remove the 'static' and the type qualifiers. 2342 if (ASM == ArrayType::Static) 2343 ASM = ArrayType::Normal; 2344 ATI.TypeQuals = 0; 2345 D.setInvalidType(true); 2346 } 2347 2348 // C99 6.7.5.2p1: ... and then only in the outermost array type 2349 // derivation. 2350 unsigned x = chunkIndex; 2351 while (x != 0) { 2352 // Walk outwards along the declarator chunks. 2353 x--; 2354 const DeclaratorChunk &DC = D.getTypeObject(x); 2355 switch (DC.Kind) { 2356 case DeclaratorChunk::Paren: 2357 continue; 2358 case DeclaratorChunk::Array: 2359 case DeclaratorChunk::Pointer: 2360 case DeclaratorChunk::Reference: 2361 case DeclaratorChunk::MemberPointer: 2362 S.Diag(DeclType.Loc, diag::err_array_static_not_outermost) << 2363 (ASM == ArrayType::Static ? "'static'" : "type qualifier"); 2364 if (ASM == ArrayType::Static) 2365 ASM = ArrayType::Normal; 2366 ATI.TypeQuals = 0; 2367 D.setInvalidType(true); 2368 break; 2369 case DeclaratorChunk::Function: 2370 case DeclaratorChunk::BlockPointer: 2371 // These are invalid anyway, so just ignore. 2372 break; 2373 } 2374 } 2375 } 2376 2377 T = S.BuildArrayType(T, ASM, ArraySize, ATI.TypeQuals, 2378 SourceRange(DeclType.Loc, DeclType.EndLoc), Name); 2379 break; 2380 } 2381 case DeclaratorChunk::Function: { 2382 // If the function declarator has a prototype (i.e. it is not () and 2383 // does not have a K&R-style identifier list), then the arguments are part 2384 // of the type, otherwise the argument list is (). 2385 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun; 2386 IsQualifiedFunction = FTI.TypeQuals || FTI.hasRefQualifier(); 2387 2388 // Check for auto functions and trailing return type and adjust the 2389 // return type accordingly. 2390 if (!D.isInvalidType()) { 2391 // trailing-return-type is only required if we're declaring a function, 2392 // and not, for instance, a pointer to a function. 2393 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto && 2394 !FTI.hasTrailingReturnType() && chunkIndex == 0) { 2395 S.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 2396 diag::err_auto_missing_trailing_return); 2397 T = Context.IntTy; 2398 D.setInvalidType(true); 2399 } else if (FTI.hasTrailingReturnType()) { 2400 // T must be exactly 'auto' at this point. See CWG issue 681. 2401 if (isa<ParenType>(T)) { 2402 S.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 2403 diag::err_trailing_return_in_parens) 2404 << T << D.getDeclSpec().getSourceRange(); 2405 D.setInvalidType(true); 2406 } else if (D.getContext() != Declarator::LambdaExprContext && 2407 (T.hasQualifiers() || !isa<AutoType>(T))) { 2408 S.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 2409 diag::err_trailing_return_without_auto) 2410 << T << D.getDeclSpec().getSourceRange(); 2411 D.setInvalidType(true); 2412 } 2413 T = S.GetTypeFromParser(FTI.getTrailingReturnType(), &TInfo); 2414 if (T.isNull()) { 2415 // An error occurred parsing the trailing return type. 2416 T = Context.IntTy; 2417 D.setInvalidType(true); 2418 } 2419 } 2420 } 2421 2422 // C99 6.7.5.3p1: The return type may not be a function or array type. 2423 // For conversion functions, we'll diagnose this particular error later. 2424 if ((T->isArrayType() || T->isFunctionType()) && 2425 (D.getName().getKind() != UnqualifiedId::IK_ConversionFunctionId)) { 2426 unsigned diagID = diag::err_func_returning_array_function; 2427 // Last processing chunk in block context means this function chunk 2428 // represents the block. 2429 if (chunkIndex == 0 && 2430 D.getContext() == Declarator::BlockLiteralContext) 2431 diagID = diag::err_block_returning_array_function; 2432 S.Diag(DeclType.Loc, diagID) << T->isFunctionType() << T; 2433 T = Context.IntTy; 2434 D.setInvalidType(true); 2435 } 2436 2437 // Do not allow returning half FP value. 2438 // FIXME: This really should be in BuildFunctionType. 2439 if (T->isHalfType()) { 2440 S.Diag(D.getIdentifierLoc(), 2441 diag::err_parameters_retval_cannot_have_fp16_type) << 1 2442 << FixItHint::CreateInsertion(D.getIdentifierLoc(), "*"); 2443 D.setInvalidType(true); 2444 } 2445 2446 // cv-qualifiers on return types are pointless except when the type is a 2447 // class type in C++. 2448 if (isa<PointerType>(T) && T.getLocalCVRQualifiers() && 2449 (D.getName().getKind() != UnqualifiedId::IK_ConversionFunctionId) && 2450 (!LangOpts.CPlusPlus || !T->isDependentType())) { 2451 assert(chunkIndex + 1 < e && "No DeclaratorChunk for the return type?"); 2452 DeclaratorChunk ReturnTypeChunk = D.getTypeObject(chunkIndex + 1); 2453 assert(ReturnTypeChunk.Kind == DeclaratorChunk::Pointer); 2454 2455 DeclaratorChunk::PointerTypeInfo &PTI = ReturnTypeChunk.Ptr; 2456 2457 DiagnoseIgnoredQualifiers(PTI.TypeQuals, 2458 SourceLocation::getFromRawEncoding(PTI.ConstQualLoc), 2459 SourceLocation::getFromRawEncoding(PTI.VolatileQualLoc), 2460 SourceLocation::getFromRawEncoding(PTI.RestrictQualLoc), 2461 S); 2462 2463 } else if (T.getCVRQualifiers() && D.getDeclSpec().getTypeQualifiers() && 2464 (!LangOpts.CPlusPlus || 2465 (!T->isDependentType() && !T->isRecordType()))) { 2466 2467 DiagnoseIgnoredQualifiers(D.getDeclSpec().getTypeQualifiers(), 2468 D.getDeclSpec().getConstSpecLoc(), 2469 D.getDeclSpec().getVolatileSpecLoc(), 2470 D.getDeclSpec().getRestrictSpecLoc(), 2471 S); 2472 } 2473 2474 if (LangOpts.CPlusPlus && D.getDeclSpec().isTypeSpecOwned()) { 2475 // C++ [dcl.fct]p6: 2476 // Types shall not be defined in return or parameter types. 2477 TagDecl *Tag = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 2478 if (Tag->isCompleteDefinition()) 2479 S.Diag(Tag->getLocation(), diag::err_type_defined_in_result_type) 2480 << Context.getTypeDeclType(Tag); 2481 } 2482 2483 // Exception specs are not allowed in typedefs. Complain, but add it 2484 // anyway. 2485 if (IsTypedefName && FTI.getExceptionSpecType()) 2486 S.Diag(FTI.getExceptionSpecLoc(), diag::err_exception_spec_in_typedef) 2487 << (D.getContext() == Declarator::AliasDeclContext || 2488 D.getContext() == Declarator::AliasTemplateContext); 2489 2490 // If we see "T var();" or "T var(T());" at block scope, it is probably 2491 // an attempt to initialize a variable, not a function declaration. 2492 if (FTI.isAmbiguous) 2493 warnAboutAmbiguousFunction(S, D, DeclType, T); 2494 2495 if (!FTI.NumArgs && !FTI.isVariadic && !LangOpts.CPlusPlus) { 2496 // Simple void foo(), where the incoming T is the result type. 2497 T = Context.getFunctionNoProtoType(T); 2498 } else { 2499 // We allow a zero-parameter variadic function in C if the 2500 // function is marked with the "overloadable" attribute. Scan 2501 // for this attribute now. 2502 if (!FTI.NumArgs && FTI.isVariadic && !LangOpts.CPlusPlus) { 2503 bool Overloadable = false; 2504 for (const AttributeList *Attrs = D.getAttributes(); 2505 Attrs; Attrs = Attrs->getNext()) { 2506 if (Attrs->getKind() == AttributeList::AT_Overloadable) { 2507 Overloadable = true; 2508 break; 2509 } 2510 } 2511 2512 if (!Overloadable) 2513 S.Diag(FTI.getEllipsisLoc(), diag::err_ellipsis_first_arg); 2514 } 2515 2516 if (FTI.NumArgs && FTI.ArgInfo[0].Param == 0) { 2517 // C99 6.7.5.3p3: Reject int(x,y,z) when it's not a function 2518 // definition. 2519 S.Diag(FTI.ArgInfo[0].IdentLoc, diag::err_ident_list_in_fn_declaration); 2520 D.setInvalidType(true); 2521 break; 2522 } 2523 2524 FunctionProtoType::ExtProtoInfo EPI; 2525 EPI.Variadic = FTI.isVariadic; 2526 EPI.HasTrailingReturn = FTI.hasTrailingReturnType(); 2527 EPI.TypeQuals = FTI.TypeQuals; 2528 EPI.RefQualifier = !FTI.hasRefQualifier()? RQ_None 2529 : FTI.RefQualifierIsLValueRef? RQ_LValue 2530 : RQ_RValue; 2531 2532 // Otherwise, we have a function with an argument list that is 2533 // potentially variadic. 2534 SmallVector<QualType, 16> ArgTys; 2535 ArgTys.reserve(FTI.NumArgs); 2536 2537 SmallVector<bool, 16> ConsumedArguments; 2538 ConsumedArguments.reserve(FTI.NumArgs); 2539 bool HasAnyConsumedArguments = false; 2540 2541 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 2542 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 2543 QualType ArgTy = Param->getType(); 2544 assert(!ArgTy.isNull() && "Couldn't parse type?"); 2545 2546 // Adjust the parameter type. 2547 assert((ArgTy == Context.getAdjustedParameterType(ArgTy)) && 2548 "Unadjusted type?"); 2549 2550 // Look for 'void'. void is allowed only as a single argument to a 2551 // function with no other parameters (C99 6.7.5.3p10). We record 2552 // int(void) as a FunctionProtoType with an empty argument list. 2553 if (ArgTy->isVoidType()) { 2554 // If this is something like 'float(int, void)', reject it. 'void' 2555 // is an incomplete type (C99 6.2.5p19) and function decls cannot 2556 // have arguments of incomplete type. 2557 if (FTI.NumArgs != 1 || FTI.isVariadic) { 2558 S.Diag(DeclType.Loc, diag::err_void_only_param); 2559 ArgTy = Context.IntTy; 2560 Param->setType(ArgTy); 2561 } else if (FTI.ArgInfo[i].Ident) { 2562 // Reject, but continue to parse 'int(void abc)'. 2563 S.Diag(FTI.ArgInfo[i].IdentLoc, 2564 diag::err_param_with_void_type); 2565 ArgTy = Context.IntTy; 2566 Param->setType(ArgTy); 2567 } else { 2568 // Reject, but continue to parse 'float(const void)'. 2569 if (ArgTy.hasQualifiers()) 2570 S.Diag(DeclType.Loc, diag::err_void_param_qualified); 2571 2572 // Do not add 'void' to the ArgTys list. 2573 break; 2574 } 2575 } else if (ArgTy->isHalfType()) { 2576 // Disallow half FP arguments. 2577 // FIXME: This really should be in BuildFunctionType. 2578 S.Diag(Param->getLocation(), 2579 diag::err_parameters_retval_cannot_have_fp16_type) << 0 2580 << FixItHint::CreateInsertion(Param->getLocation(), "*"); 2581 D.setInvalidType(); 2582 } else if (!FTI.hasPrototype) { 2583 if (ArgTy->isPromotableIntegerType()) { 2584 ArgTy = Context.getPromotedIntegerType(ArgTy); 2585 Param->setKNRPromoted(true); 2586 } else if (const BuiltinType* BTy = ArgTy->getAs<BuiltinType>()) { 2587 if (BTy->getKind() == BuiltinType::Float) { 2588 ArgTy = Context.DoubleTy; 2589 Param->setKNRPromoted(true); 2590 } 2591 } 2592 } 2593 2594 if (LangOpts.ObjCAutoRefCount) { 2595 bool Consumed = Param->hasAttr<NSConsumedAttr>(); 2596 ConsumedArguments.push_back(Consumed); 2597 HasAnyConsumedArguments |= Consumed; 2598 } 2599 2600 ArgTys.push_back(ArgTy); 2601 } 2602 2603 if (HasAnyConsumedArguments) 2604 EPI.ConsumedArguments = ConsumedArguments.data(); 2605 2606 SmallVector<QualType, 4> Exceptions; 2607 SmallVector<ParsedType, 2> DynamicExceptions; 2608 SmallVector<SourceRange, 2> DynamicExceptionRanges; 2609 Expr *NoexceptExpr = 0; 2610 2611 if (FTI.getExceptionSpecType() == EST_Dynamic) { 2612 // FIXME: It's rather inefficient to have to split into two vectors 2613 // here. 2614 unsigned N = FTI.NumExceptions; 2615 DynamicExceptions.reserve(N); 2616 DynamicExceptionRanges.reserve(N); 2617 for (unsigned I = 0; I != N; ++I) { 2618 DynamicExceptions.push_back(FTI.Exceptions[I].Ty); 2619 DynamicExceptionRanges.push_back(FTI.Exceptions[I].Range); 2620 } 2621 } else if (FTI.getExceptionSpecType() == EST_ComputedNoexcept) { 2622 NoexceptExpr = FTI.NoexceptExpr; 2623 } 2624 2625 S.checkExceptionSpecification(FTI.getExceptionSpecType(), 2626 DynamicExceptions, 2627 DynamicExceptionRanges, 2628 NoexceptExpr, 2629 Exceptions, 2630 EPI); 2631 2632 T = Context.getFunctionType(T, ArgTys.data(), ArgTys.size(), EPI); 2633 } 2634 2635 break; 2636 } 2637 case DeclaratorChunk::MemberPointer: 2638 // The scope spec must refer to a class, or be dependent. 2639 CXXScopeSpec &SS = DeclType.Mem.Scope(); 2640 QualType ClsType; 2641 if (SS.isInvalid()) { 2642 // Avoid emitting extra errors if we already errored on the scope. 2643 D.setInvalidType(true); 2644 } else if (S.isDependentScopeSpecifier(SS) || 2645 dyn_cast_or_null<CXXRecordDecl>(S.computeDeclContext(SS))) { 2646 NestedNameSpecifier *NNS 2647 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 2648 NestedNameSpecifier *NNSPrefix = NNS->getPrefix(); 2649 switch (NNS->getKind()) { 2650 case NestedNameSpecifier::Identifier: 2651 ClsType = Context.getDependentNameType(ETK_None, NNSPrefix, 2652 NNS->getAsIdentifier()); 2653 break; 2654 2655 case NestedNameSpecifier::Namespace: 2656 case NestedNameSpecifier::NamespaceAlias: 2657 case NestedNameSpecifier::Global: 2658 llvm_unreachable("Nested-name-specifier must name a type"); 2659 2660 case NestedNameSpecifier::TypeSpec: 2661 case NestedNameSpecifier::TypeSpecWithTemplate: 2662 ClsType = QualType(NNS->getAsType(), 0); 2663 // Note: if the NNS has a prefix and ClsType is a nondependent 2664 // TemplateSpecializationType, then the NNS prefix is NOT included 2665 // in ClsType; hence we wrap ClsType into an ElaboratedType. 2666 // NOTE: in particular, no wrap occurs if ClsType already is an 2667 // Elaborated, DependentName, or DependentTemplateSpecialization. 2668 if (NNSPrefix && isa<TemplateSpecializationType>(NNS->getAsType())) 2669 ClsType = Context.getElaboratedType(ETK_None, NNSPrefix, ClsType); 2670 break; 2671 } 2672 } else { 2673 S.Diag(DeclType.Mem.Scope().getBeginLoc(), 2674 diag::err_illegal_decl_mempointer_in_nonclass) 2675 << (D.getIdentifier() ? D.getIdentifier()->getName() : "type name") 2676 << DeclType.Mem.Scope().getRange(); 2677 D.setInvalidType(true); 2678 } 2679 2680 if (!ClsType.isNull()) 2681 T = S.BuildMemberPointerType(T, ClsType, DeclType.Loc, D.getIdentifier()); 2682 if (T.isNull()) { 2683 T = Context.IntTy; 2684 D.setInvalidType(true); 2685 } else if (DeclType.Mem.TypeQuals) { 2686 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Mem.TypeQuals); 2687 } 2688 break; 2689 } 2690 2691 if (T.isNull()) { 2692 D.setInvalidType(true); 2693 T = Context.IntTy; 2694 } 2695 2696 // See if there are any attributes on this declarator chunk. 2697 if (AttributeList *attrs = const_cast<AttributeList*>(DeclType.getAttrs())) 2698 processTypeAttrs(state, T, TAL_DeclChunk, attrs); 2699 } 2700 2701 if (LangOpts.CPlusPlus && T->isFunctionType()) { 2702 const FunctionProtoType *FnTy = T->getAs<FunctionProtoType>(); 2703 assert(FnTy && "Why oh why is there not a FunctionProtoType here?"); 2704 2705 // C++ 8.3.5p4: 2706 // A cv-qualifier-seq shall only be part of the function type 2707 // for a nonstatic member function, the function type to which a pointer 2708 // to member refers, or the top-level function type of a function typedef 2709 // declaration. 2710 // 2711 // Core issue 547 also allows cv-qualifiers on function types that are 2712 // top-level template type arguments. 2713 bool FreeFunction; 2714 if (!D.getCXXScopeSpec().isSet()) { 2715 FreeFunction = ((D.getContext() != Declarator::MemberContext && 2716 D.getContext() != Declarator::LambdaExprContext) || 2717 D.getDeclSpec().isFriendSpecified()); 2718 } else { 2719 DeclContext *DC = S.computeDeclContext(D.getCXXScopeSpec()); 2720 FreeFunction = (DC && !DC->isRecord()); 2721 } 2722 2723 // C++11 [dcl.fct]p6 (w/DR1417): 2724 // An attempt to specify a function type with a cv-qualifier-seq or a 2725 // ref-qualifier (including by typedef-name) is ill-formed unless it is: 2726 // - the function type for a non-static member function, 2727 // - the function type to which a pointer to member refers, 2728 // - the top-level function type of a function typedef declaration or 2729 // alias-declaration, 2730 // - the type-id in the default argument of a type-parameter, or 2731 // - the type-id of a template-argument for a type-parameter 2732 if (IsQualifiedFunction && 2733 !(!FreeFunction && 2734 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) && 2735 !IsTypedefName && 2736 D.getContext() != Declarator::TemplateTypeArgContext) { 2737 SourceLocation Loc = D.getLocStart(); 2738 SourceRange RemovalRange; 2739 unsigned I; 2740 if (D.isFunctionDeclarator(I)) { 2741 SmallVector<SourceLocation, 4> RemovalLocs; 2742 const DeclaratorChunk &Chunk = D.getTypeObject(I); 2743 assert(Chunk.Kind == DeclaratorChunk::Function); 2744 if (Chunk.Fun.hasRefQualifier()) 2745 RemovalLocs.push_back(Chunk.Fun.getRefQualifierLoc()); 2746 if (Chunk.Fun.TypeQuals & Qualifiers::Const) 2747 RemovalLocs.push_back(Chunk.Fun.getConstQualifierLoc()); 2748 if (Chunk.Fun.TypeQuals & Qualifiers::Volatile) 2749 RemovalLocs.push_back(Chunk.Fun.getVolatileQualifierLoc()); 2750 // FIXME: We do not track the location of the __restrict qualifier. 2751 //if (Chunk.Fun.TypeQuals & Qualifiers::Restrict) 2752 // RemovalLocs.push_back(Chunk.Fun.getRestrictQualifierLoc()); 2753 if (!RemovalLocs.empty()) { 2754 std::sort(RemovalLocs.begin(), RemovalLocs.end(), 2755 BeforeThanCompare<SourceLocation>(S.getSourceManager())); 2756 RemovalRange = SourceRange(RemovalLocs.front(), RemovalLocs.back()); 2757 Loc = RemovalLocs.front(); 2758 } 2759 } 2760 2761 S.Diag(Loc, diag::err_invalid_qualified_function_type) 2762 << FreeFunction << D.isFunctionDeclarator() << T 2763 << getFunctionQualifiersAsString(FnTy) 2764 << FixItHint::CreateRemoval(RemovalRange); 2765 2766 // Strip the cv-qualifiers and ref-qualifiers from the type. 2767 FunctionProtoType::ExtProtoInfo EPI = FnTy->getExtProtoInfo(); 2768 EPI.TypeQuals = 0; 2769 EPI.RefQualifier = RQ_None; 2770 2771 T = Context.getFunctionType(FnTy->getResultType(), 2772 FnTy->arg_type_begin(), 2773 FnTy->getNumArgs(), EPI); 2774 // Rebuild any parens around the identifier in the function type. 2775 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 2776 if (D.getTypeObject(i).Kind != DeclaratorChunk::Paren) 2777 break; 2778 T = S.BuildParenType(T); 2779 } 2780 } 2781 } 2782 2783 // Apply any undistributed attributes from the declarator. 2784 if (!T.isNull()) 2785 if (AttributeList *attrs = D.getAttributes()) 2786 processTypeAttrs(state, T, TAL_DeclName, attrs); 2787 2788 // Diagnose any ignored type attributes. 2789 if (!T.isNull()) state.diagnoseIgnoredTypeAttrs(T); 2790 2791 // C++0x [dcl.constexpr]p9: 2792 // A constexpr specifier used in an object declaration declares the object 2793 // as const. 2794 if (D.getDeclSpec().isConstexprSpecified() && T->isObjectType()) { 2795 T.addConst(); 2796 } 2797 2798 // If there was an ellipsis in the declarator, the declaration declares a 2799 // parameter pack whose type may be a pack expansion type. 2800 if (D.hasEllipsis() && !T.isNull()) { 2801 // C++0x [dcl.fct]p13: 2802 // A declarator-id or abstract-declarator containing an ellipsis shall 2803 // only be used in a parameter-declaration. Such a parameter-declaration 2804 // is a parameter pack (14.5.3). [...] 2805 switch (D.getContext()) { 2806 case Declarator::PrototypeContext: 2807 // C++0x [dcl.fct]p13: 2808 // [...] When it is part of a parameter-declaration-clause, the 2809 // parameter pack is a function parameter pack (14.5.3). The type T 2810 // of the declarator-id of the function parameter pack shall contain 2811 // a template parameter pack; each template parameter pack in T is 2812 // expanded by the function parameter pack. 2813 // 2814 // We represent function parameter packs as function parameters whose 2815 // type is a pack expansion. 2816 if (!T->containsUnexpandedParameterPack()) { 2817 S.Diag(D.getEllipsisLoc(), 2818 diag::err_function_parameter_pack_without_parameter_packs) 2819 << T << D.getSourceRange(); 2820 D.setEllipsisLoc(SourceLocation()); 2821 } else { 2822 T = Context.getPackExpansionType(T, llvm::Optional<unsigned>()); 2823 } 2824 break; 2825 2826 case Declarator::TemplateParamContext: 2827 // C++0x [temp.param]p15: 2828 // If a template-parameter is a [...] is a parameter-declaration that 2829 // declares a parameter pack (8.3.5), then the template-parameter is a 2830 // template parameter pack (14.5.3). 2831 // 2832 // Note: core issue 778 clarifies that, if there are any unexpanded 2833 // parameter packs in the type of the non-type template parameter, then 2834 // it expands those parameter packs. 2835 if (T->containsUnexpandedParameterPack()) 2836 T = Context.getPackExpansionType(T, llvm::Optional<unsigned>()); 2837 else 2838 S.Diag(D.getEllipsisLoc(), 2839 LangOpts.CPlusPlus11 2840 ? diag::warn_cxx98_compat_variadic_templates 2841 : diag::ext_variadic_templates); 2842 break; 2843 2844 case Declarator::FileContext: 2845 case Declarator::KNRTypeListContext: 2846 case Declarator::ObjCParameterContext: // FIXME: special diagnostic here? 2847 case Declarator::ObjCResultContext: // FIXME: special diagnostic here? 2848 case Declarator::TypeNameContext: 2849 case Declarator::CXXNewContext: 2850 case Declarator::AliasDeclContext: 2851 case Declarator::AliasTemplateContext: 2852 case Declarator::MemberContext: 2853 case Declarator::BlockContext: 2854 case Declarator::ForContext: 2855 case Declarator::ConditionContext: 2856 case Declarator::CXXCatchContext: 2857 case Declarator::ObjCCatchContext: 2858 case Declarator::BlockLiteralContext: 2859 case Declarator::LambdaExprContext: 2860 case Declarator::TrailingReturnContext: 2861 case Declarator::TemplateTypeArgContext: 2862 // FIXME: We may want to allow parameter packs in block-literal contexts 2863 // in the future. 2864 S.Diag(D.getEllipsisLoc(), diag::err_ellipsis_in_declarator_not_parameter); 2865 D.setEllipsisLoc(SourceLocation()); 2866 break; 2867 } 2868 } 2869 2870 if (T.isNull()) 2871 return Context.getNullTypeSourceInfo(); 2872 else if (D.isInvalidType()) 2873 return Context.getTrivialTypeSourceInfo(T); 2874 2875 return S.GetTypeSourceInfoForDeclarator(D, T, TInfo); 2876} 2877 2878/// GetTypeForDeclarator - Convert the type for the specified 2879/// declarator to Type instances. 2880/// 2881/// The result of this call will never be null, but the associated 2882/// type may be a null type if there's an unrecoverable error. 2883TypeSourceInfo *Sema::GetTypeForDeclarator(Declarator &D, Scope *S) { 2884 // Determine the type of the declarator. Not all forms of declarator 2885 // have a type. 2886 2887 TypeProcessingState state(*this, D); 2888 2889 TypeSourceInfo *ReturnTypeInfo = 0; 2890 QualType T = GetDeclSpecTypeForDeclarator(state, ReturnTypeInfo); 2891 if (T.isNull()) 2892 return Context.getNullTypeSourceInfo(); 2893 2894 if (D.isPrototypeContext() && getLangOpts().ObjCAutoRefCount) 2895 inferARCWriteback(state, T); 2896 2897 return GetFullTypeForDeclarator(state, T, ReturnTypeInfo); 2898} 2899 2900static void transferARCOwnershipToDeclSpec(Sema &S, 2901 QualType &declSpecTy, 2902 Qualifiers::ObjCLifetime ownership) { 2903 if (declSpecTy->isObjCRetainableType() && 2904 declSpecTy.getObjCLifetime() == Qualifiers::OCL_None) { 2905 Qualifiers qs; 2906 qs.addObjCLifetime(ownership); 2907 declSpecTy = S.Context.getQualifiedType(declSpecTy, qs); 2908 } 2909} 2910 2911static void transferARCOwnershipToDeclaratorChunk(TypeProcessingState &state, 2912 Qualifiers::ObjCLifetime ownership, 2913 unsigned chunkIndex) { 2914 Sema &S = state.getSema(); 2915 Declarator &D = state.getDeclarator(); 2916 2917 // Look for an explicit lifetime attribute. 2918 DeclaratorChunk &chunk = D.getTypeObject(chunkIndex); 2919 for (const AttributeList *attr = chunk.getAttrs(); attr; 2920 attr = attr->getNext()) 2921 if (attr->getKind() == AttributeList::AT_ObjCOwnership) 2922 return; 2923 2924 const char *attrStr = 0; 2925 switch (ownership) { 2926 case Qualifiers::OCL_None: llvm_unreachable("no ownership!"); 2927 case Qualifiers::OCL_ExplicitNone: attrStr = "none"; break; 2928 case Qualifiers::OCL_Strong: attrStr = "strong"; break; 2929 case Qualifiers::OCL_Weak: attrStr = "weak"; break; 2930 case Qualifiers::OCL_Autoreleasing: attrStr = "autoreleasing"; break; 2931 } 2932 2933 // If there wasn't one, add one (with an invalid source location 2934 // so that we don't make an AttributedType for it). 2935 AttributeList *attr = D.getAttributePool() 2936 .create(&S.Context.Idents.get("objc_ownership"), SourceLocation(), 2937 /*scope*/ 0, SourceLocation(), 2938 &S.Context.Idents.get(attrStr), SourceLocation(), 2939 /*args*/ 0, 0, AttributeList::AS_GNU); 2940 spliceAttrIntoList(*attr, chunk.getAttrListRef()); 2941 2942 // TODO: mark whether we did this inference? 2943} 2944 2945/// \brief Used for transferring ownership in casts resulting in l-values. 2946static void transferARCOwnership(TypeProcessingState &state, 2947 QualType &declSpecTy, 2948 Qualifiers::ObjCLifetime ownership) { 2949 Sema &S = state.getSema(); 2950 Declarator &D = state.getDeclarator(); 2951 2952 int inner = -1; 2953 bool hasIndirection = false; 2954 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 2955 DeclaratorChunk &chunk = D.getTypeObject(i); 2956 switch (chunk.Kind) { 2957 case DeclaratorChunk::Paren: 2958 // Ignore parens. 2959 break; 2960 2961 case DeclaratorChunk::Array: 2962 case DeclaratorChunk::Reference: 2963 case DeclaratorChunk::Pointer: 2964 if (inner != -1) 2965 hasIndirection = true; 2966 inner = i; 2967 break; 2968 2969 case DeclaratorChunk::BlockPointer: 2970 if (inner != -1) 2971 transferARCOwnershipToDeclaratorChunk(state, ownership, i); 2972 return; 2973 2974 case DeclaratorChunk::Function: 2975 case DeclaratorChunk::MemberPointer: 2976 return; 2977 } 2978 } 2979 2980 if (inner == -1) 2981 return; 2982 2983 DeclaratorChunk &chunk = D.getTypeObject(inner); 2984 if (chunk.Kind == DeclaratorChunk::Pointer) { 2985 if (declSpecTy->isObjCRetainableType()) 2986 return transferARCOwnershipToDeclSpec(S, declSpecTy, ownership); 2987 if (declSpecTy->isObjCObjectType() && hasIndirection) 2988 return transferARCOwnershipToDeclaratorChunk(state, ownership, inner); 2989 } else { 2990 assert(chunk.Kind == DeclaratorChunk::Array || 2991 chunk.Kind == DeclaratorChunk::Reference); 2992 return transferARCOwnershipToDeclSpec(S, declSpecTy, ownership); 2993 } 2994} 2995 2996TypeSourceInfo *Sema::GetTypeForDeclaratorCast(Declarator &D, QualType FromTy) { 2997 TypeProcessingState state(*this, D); 2998 2999 TypeSourceInfo *ReturnTypeInfo = 0; 3000 QualType declSpecTy = GetDeclSpecTypeForDeclarator(state, ReturnTypeInfo); 3001 if (declSpecTy.isNull()) 3002 return Context.getNullTypeSourceInfo(); 3003 3004 if (getLangOpts().ObjCAutoRefCount) { 3005 Qualifiers::ObjCLifetime ownership = Context.getInnerObjCOwnership(FromTy); 3006 if (ownership != Qualifiers::OCL_None) 3007 transferARCOwnership(state, declSpecTy, ownership); 3008 } 3009 3010 return GetFullTypeForDeclarator(state, declSpecTy, ReturnTypeInfo); 3011} 3012 3013/// Map an AttributedType::Kind to an AttributeList::Kind. 3014static AttributeList::Kind getAttrListKind(AttributedType::Kind kind) { 3015 switch (kind) { 3016 case AttributedType::attr_address_space: 3017 return AttributeList::AT_AddressSpace; 3018 case AttributedType::attr_regparm: 3019 return AttributeList::AT_Regparm; 3020 case AttributedType::attr_vector_size: 3021 return AttributeList::AT_VectorSize; 3022 case AttributedType::attr_neon_vector_type: 3023 return AttributeList::AT_NeonVectorType; 3024 case AttributedType::attr_neon_polyvector_type: 3025 return AttributeList::AT_NeonPolyVectorType; 3026 case AttributedType::attr_objc_gc: 3027 return AttributeList::AT_ObjCGC; 3028 case AttributedType::attr_objc_ownership: 3029 return AttributeList::AT_ObjCOwnership; 3030 case AttributedType::attr_noreturn: 3031 return AttributeList::AT_NoReturn; 3032 case AttributedType::attr_cdecl: 3033 return AttributeList::AT_CDecl; 3034 case AttributedType::attr_fastcall: 3035 return AttributeList::AT_FastCall; 3036 case AttributedType::attr_stdcall: 3037 return AttributeList::AT_StdCall; 3038 case AttributedType::attr_thiscall: 3039 return AttributeList::AT_ThisCall; 3040 case AttributedType::attr_pascal: 3041 return AttributeList::AT_Pascal; 3042 case AttributedType::attr_pcs: 3043 return AttributeList::AT_Pcs; 3044 case AttributedType::attr_pnaclcall: 3045 return AttributeList::AT_PnaclCall; 3046 case AttributedType::attr_inteloclbicc: 3047 return AttributeList::AT_IntelOclBicc; 3048 } 3049 llvm_unreachable("unexpected attribute kind!"); 3050} 3051 3052static void fillAttributedTypeLoc(AttributedTypeLoc TL, 3053 const AttributeList *attrs) { 3054 AttributedType::Kind kind = TL.getAttrKind(); 3055 3056 assert(attrs && "no type attributes in the expected location!"); 3057 AttributeList::Kind parsedKind = getAttrListKind(kind); 3058 while (attrs->getKind() != parsedKind) { 3059 attrs = attrs->getNext(); 3060 assert(attrs && "no matching attribute in expected location!"); 3061 } 3062 3063 TL.setAttrNameLoc(attrs->getLoc()); 3064 if (TL.hasAttrExprOperand()) 3065 TL.setAttrExprOperand(attrs->getArg(0)); 3066 else if (TL.hasAttrEnumOperand()) 3067 TL.setAttrEnumOperandLoc(attrs->getParameterLoc()); 3068 3069 // FIXME: preserve this information to here. 3070 if (TL.hasAttrOperand()) 3071 TL.setAttrOperandParensRange(SourceRange()); 3072} 3073 3074namespace { 3075 class TypeSpecLocFiller : public TypeLocVisitor<TypeSpecLocFiller> { 3076 ASTContext &Context; 3077 const DeclSpec &DS; 3078 3079 public: 3080 TypeSpecLocFiller(ASTContext &Context, const DeclSpec &DS) 3081 : Context(Context), DS(DS) {} 3082 3083 void VisitAttributedTypeLoc(AttributedTypeLoc TL) { 3084 fillAttributedTypeLoc(TL, DS.getAttributes().getList()); 3085 Visit(TL.getModifiedLoc()); 3086 } 3087 void VisitQualifiedTypeLoc(QualifiedTypeLoc TL) { 3088 Visit(TL.getUnqualifiedLoc()); 3089 } 3090 void VisitTypedefTypeLoc(TypedefTypeLoc TL) { 3091 TL.setNameLoc(DS.getTypeSpecTypeLoc()); 3092 } 3093 void VisitObjCInterfaceTypeLoc(ObjCInterfaceTypeLoc TL) { 3094 TL.setNameLoc(DS.getTypeSpecTypeLoc()); 3095 // FIXME. We should have DS.getTypeSpecTypeEndLoc(). But, it requires 3096 // addition field. What we have is good enough for dispay of location 3097 // of 'fixit' on interface name. 3098 TL.setNameEndLoc(DS.getLocEnd()); 3099 } 3100 void VisitObjCObjectTypeLoc(ObjCObjectTypeLoc TL) { 3101 // Handle the base type, which might not have been written explicitly. 3102 if (DS.getTypeSpecType() == DeclSpec::TST_unspecified) { 3103 TL.setHasBaseTypeAsWritten(false); 3104 TL.getBaseLoc().initialize(Context, SourceLocation()); 3105 } else { 3106 TL.setHasBaseTypeAsWritten(true); 3107 Visit(TL.getBaseLoc()); 3108 } 3109 3110 // Protocol qualifiers. 3111 if (DS.getProtocolQualifiers()) { 3112 assert(TL.getNumProtocols() > 0); 3113 assert(TL.getNumProtocols() == DS.getNumProtocolQualifiers()); 3114 TL.setLAngleLoc(DS.getProtocolLAngleLoc()); 3115 TL.setRAngleLoc(DS.getSourceRange().getEnd()); 3116 for (unsigned i = 0, e = DS.getNumProtocolQualifiers(); i != e; ++i) 3117 TL.setProtocolLoc(i, DS.getProtocolLocs()[i]); 3118 } else { 3119 assert(TL.getNumProtocols() == 0); 3120 TL.setLAngleLoc(SourceLocation()); 3121 TL.setRAngleLoc(SourceLocation()); 3122 } 3123 } 3124 void VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL) { 3125 TL.setStarLoc(SourceLocation()); 3126 Visit(TL.getPointeeLoc()); 3127 } 3128 void VisitTemplateSpecializationTypeLoc(TemplateSpecializationTypeLoc TL) { 3129 TypeSourceInfo *TInfo = 0; 3130 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 3131 3132 // If we got no declarator info from previous Sema routines, 3133 // just fill with the typespec loc. 3134 if (!TInfo) { 3135 TL.initialize(Context, DS.getTypeSpecTypeNameLoc()); 3136 return; 3137 } 3138 3139 TypeLoc OldTL = TInfo->getTypeLoc(); 3140 if (TInfo->getType()->getAs<ElaboratedType>()) { 3141 ElaboratedTypeLoc ElabTL = cast<ElaboratedTypeLoc>(OldTL); 3142 TemplateSpecializationTypeLoc NamedTL = 3143 cast<TemplateSpecializationTypeLoc>(ElabTL.getNamedTypeLoc()); 3144 TL.copy(NamedTL); 3145 } 3146 else 3147 TL.copy(cast<TemplateSpecializationTypeLoc>(OldTL)); 3148 } 3149 void VisitTypeOfExprTypeLoc(TypeOfExprTypeLoc TL) { 3150 assert(DS.getTypeSpecType() == DeclSpec::TST_typeofExpr); 3151 TL.setTypeofLoc(DS.getTypeSpecTypeLoc()); 3152 TL.setParensRange(DS.getTypeofParensRange()); 3153 } 3154 void VisitTypeOfTypeLoc(TypeOfTypeLoc TL) { 3155 assert(DS.getTypeSpecType() == DeclSpec::TST_typeofType); 3156 TL.setTypeofLoc(DS.getTypeSpecTypeLoc()); 3157 TL.setParensRange(DS.getTypeofParensRange()); 3158 assert(DS.getRepAsType()); 3159 TypeSourceInfo *TInfo = 0; 3160 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 3161 TL.setUnderlyingTInfo(TInfo); 3162 } 3163 void VisitUnaryTransformTypeLoc(UnaryTransformTypeLoc TL) { 3164 // FIXME: This holds only because we only have one unary transform. 3165 assert(DS.getTypeSpecType() == DeclSpec::TST_underlyingType); 3166 TL.setKWLoc(DS.getTypeSpecTypeLoc()); 3167 TL.setParensRange(DS.getTypeofParensRange()); 3168 assert(DS.getRepAsType()); 3169 TypeSourceInfo *TInfo = 0; 3170 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 3171 TL.setUnderlyingTInfo(TInfo); 3172 } 3173 void VisitBuiltinTypeLoc(BuiltinTypeLoc TL) { 3174 // By default, use the source location of the type specifier. 3175 TL.setBuiltinLoc(DS.getTypeSpecTypeLoc()); 3176 if (TL.needsExtraLocalData()) { 3177 // Set info for the written builtin specifiers. 3178 TL.getWrittenBuiltinSpecs() = DS.getWrittenBuiltinSpecs(); 3179 // Try to have a meaningful source location. 3180 if (TL.getWrittenSignSpec() != TSS_unspecified) 3181 // Sign spec loc overrides the others (e.g., 'unsigned long'). 3182 TL.setBuiltinLoc(DS.getTypeSpecSignLoc()); 3183 else if (TL.getWrittenWidthSpec() != TSW_unspecified) 3184 // Width spec loc overrides type spec loc (e.g., 'short int'). 3185 TL.setBuiltinLoc(DS.getTypeSpecWidthLoc()); 3186 } 3187 } 3188 void VisitElaboratedTypeLoc(ElaboratedTypeLoc TL) { 3189 ElaboratedTypeKeyword Keyword 3190 = TypeWithKeyword::getKeywordForTypeSpec(DS.getTypeSpecType()); 3191 if (DS.getTypeSpecType() == TST_typename) { 3192 TypeSourceInfo *TInfo = 0; 3193 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 3194 if (TInfo) { 3195 TL.copy(cast<ElaboratedTypeLoc>(TInfo->getTypeLoc())); 3196 return; 3197 } 3198 } 3199 TL.setElaboratedKeywordLoc(Keyword != ETK_None 3200 ? DS.getTypeSpecTypeLoc() 3201 : SourceLocation()); 3202 const CXXScopeSpec& SS = DS.getTypeSpecScope(); 3203 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 3204 Visit(TL.getNextTypeLoc().getUnqualifiedLoc()); 3205 } 3206 void VisitDependentNameTypeLoc(DependentNameTypeLoc TL) { 3207 assert(DS.getTypeSpecType() == TST_typename); 3208 TypeSourceInfo *TInfo = 0; 3209 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 3210 assert(TInfo); 3211 TL.copy(cast<DependentNameTypeLoc>(TInfo->getTypeLoc())); 3212 } 3213 void VisitDependentTemplateSpecializationTypeLoc( 3214 DependentTemplateSpecializationTypeLoc TL) { 3215 assert(DS.getTypeSpecType() == TST_typename); 3216 TypeSourceInfo *TInfo = 0; 3217 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 3218 assert(TInfo); 3219 TL.copy(cast<DependentTemplateSpecializationTypeLoc>( 3220 TInfo->getTypeLoc())); 3221 } 3222 void VisitTagTypeLoc(TagTypeLoc TL) { 3223 TL.setNameLoc(DS.getTypeSpecTypeNameLoc()); 3224 } 3225 void VisitAtomicTypeLoc(AtomicTypeLoc TL) { 3226 TL.setKWLoc(DS.getTypeSpecTypeLoc()); 3227 TL.setParensRange(DS.getTypeofParensRange()); 3228 3229 TypeSourceInfo *TInfo = 0; 3230 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 3231 TL.getValueLoc().initializeFullCopy(TInfo->getTypeLoc()); 3232 } 3233 3234 void VisitTypeLoc(TypeLoc TL) { 3235 // FIXME: add other typespec types and change this to an assert. 3236 TL.initialize(Context, DS.getTypeSpecTypeLoc()); 3237 } 3238 }; 3239 3240 class DeclaratorLocFiller : public TypeLocVisitor<DeclaratorLocFiller> { 3241 ASTContext &Context; 3242 const DeclaratorChunk &Chunk; 3243 3244 public: 3245 DeclaratorLocFiller(ASTContext &Context, const DeclaratorChunk &Chunk) 3246 : Context(Context), Chunk(Chunk) {} 3247 3248 void VisitQualifiedTypeLoc(QualifiedTypeLoc TL) { 3249 llvm_unreachable("qualified type locs not expected here!"); 3250 } 3251 3252 void VisitAttributedTypeLoc(AttributedTypeLoc TL) { 3253 fillAttributedTypeLoc(TL, Chunk.getAttrs()); 3254 } 3255 void VisitBlockPointerTypeLoc(BlockPointerTypeLoc TL) { 3256 assert(Chunk.Kind == DeclaratorChunk::BlockPointer); 3257 TL.setCaretLoc(Chunk.Loc); 3258 } 3259 void VisitPointerTypeLoc(PointerTypeLoc TL) { 3260 assert(Chunk.Kind == DeclaratorChunk::Pointer); 3261 TL.setStarLoc(Chunk.Loc); 3262 } 3263 void VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL) { 3264 assert(Chunk.Kind == DeclaratorChunk::Pointer); 3265 TL.setStarLoc(Chunk.Loc); 3266 } 3267 void VisitMemberPointerTypeLoc(MemberPointerTypeLoc TL) { 3268 assert(Chunk.Kind == DeclaratorChunk::MemberPointer); 3269 const CXXScopeSpec& SS = Chunk.Mem.Scope(); 3270 NestedNameSpecifierLoc NNSLoc = SS.getWithLocInContext(Context); 3271 3272 const Type* ClsTy = TL.getClass(); 3273 QualType ClsQT = QualType(ClsTy, 0); 3274 TypeSourceInfo *ClsTInfo = Context.CreateTypeSourceInfo(ClsQT, 0); 3275 // Now copy source location info into the type loc component. 3276 TypeLoc ClsTL = ClsTInfo->getTypeLoc(); 3277 switch (NNSLoc.getNestedNameSpecifier()->getKind()) { 3278 case NestedNameSpecifier::Identifier: 3279 assert(isa<DependentNameType>(ClsTy) && "Unexpected TypeLoc"); 3280 { 3281 DependentNameTypeLoc DNTLoc = cast<DependentNameTypeLoc>(ClsTL); 3282 DNTLoc.setElaboratedKeywordLoc(SourceLocation()); 3283 DNTLoc.setQualifierLoc(NNSLoc.getPrefix()); 3284 DNTLoc.setNameLoc(NNSLoc.getLocalBeginLoc()); 3285 } 3286 break; 3287 3288 case NestedNameSpecifier::TypeSpec: 3289 case NestedNameSpecifier::TypeSpecWithTemplate: 3290 if (isa<ElaboratedType>(ClsTy)) { 3291 ElaboratedTypeLoc ETLoc = *cast<ElaboratedTypeLoc>(&ClsTL); 3292 ETLoc.setElaboratedKeywordLoc(SourceLocation()); 3293 ETLoc.setQualifierLoc(NNSLoc.getPrefix()); 3294 TypeLoc NamedTL = ETLoc.getNamedTypeLoc(); 3295 NamedTL.initializeFullCopy(NNSLoc.getTypeLoc()); 3296 } else { 3297 ClsTL.initializeFullCopy(NNSLoc.getTypeLoc()); 3298 } 3299 break; 3300 3301 case NestedNameSpecifier::Namespace: 3302 case NestedNameSpecifier::NamespaceAlias: 3303 case NestedNameSpecifier::Global: 3304 llvm_unreachable("Nested-name-specifier must name a type"); 3305 } 3306 3307 // Finally fill in MemberPointerLocInfo fields. 3308 TL.setStarLoc(Chunk.Loc); 3309 TL.setClassTInfo(ClsTInfo); 3310 } 3311 void VisitLValueReferenceTypeLoc(LValueReferenceTypeLoc TL) { 3312 assert(Chunk.Kind == DeclaratorChunk::Reference); 3313 // 'Amp' is misleading: this might have been originally 3314 /// spelled with AmpAmp. 3315 TL.setAmpLoc(Chunk.Loc); 3316 } 3317 void VisitRValueReferenceTypeLoc(RValueReferenceTypeLoc TL) { 3318 assert(Chunk.Kind == DeclaratorChunk::Reference); 3319 assert(!Chunk.Ref.LValueRef); 3320 TL.setAmpAmpLoc(Chunk.Loc); 3321 } 3322 void VisitArrayTypeLoc(ArrayTypeLoc TL) { 3323 assert(Chunk.Kind == DeclaratorChunk::Array); 3324 TL.setLBracketLoc(Chunk.Loc); 3325 TL.setRBracketLoc(Chunk.EndLoc); 3326 TL.setSizeExpr(static_cast<Expr*>(Chunk.Arr.NumElts)); 3327 } 3328 void VisitFunctionTypeLoc(FunctionTypeLoc TL) { 3329 assert(Chunk.Kind == DeclaratorChunk::Function); 3330 TL.setLocalRangeBegin(Chunk.Loc); 3331 TL.setLocalRangeEnd(Chunk.EndLoc); 3332 3333 const DeclaratorChunk::FunctionTypeInfo &FTI = Chunk.Fun; 3334 TL.setLParenLoc(FTI.getLParenLoc()); 3335 TL.setRParenLoc(FTI.getRParenLoc()); 3336 for (unsigned i = 0, e = TL.getNumArgs(), tpi = 0; i != e; ++i) { 3337 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 3338 TL.setArg(tpi++, Param); 3339 } 3340 // FIXME: exception specs 3341 } 3342 void VisitParenTypeLoc(ParenTypeLoc TL) { 3343 assert(Chunk.Kind == DeclaratorChunk::Paren); 3344 TL.setLParenLoc(Chunk.Loc); 3345 TL.setRParenLoc(Chunk.EndLoc); 3346 } 3347 3348 void VisitTypeLoc(TypeLoc TL) { 3349 llvm_unreachable("unsupported TypeLoc kind in declarator!"); 3350 } 3351 }; 3352} 3353 3354/// \brief Create and instantiate a TypeSourceInfo with type source information. 3355/// 3356/// \param T QualType referring to the type as written in source code. 3357/// 3358/// \param ReturnTypeInfo For declarators whose return type does not show 3359/// up in the normal place in the declaration specifiers (such as a C++ 3360/// conversion function), this pointer will refer to a type source information 3361/// for that return type. 3362TypeSourceInfo * 3363Sema::GetTypeSourceInfoForDeclarator(Declarator &D, QualType T, 3364 TypeSourceInfo *ReturnTypeInfo) { 3365 TypeSourceInfo *TInfo = Context.CreateTypeSourceInfo(T); 3366 UnqualTypeLoc CurrTL = TInfo->getTypeLoc().getUnqualifiedLoc(); 3367 3368 // Handle parameter packs whose type is a pack expansion. 3369 if (isa<PackExpansionType>(T)) { 3370 cast<PackExpansionTypeLoc>(CurrTL).setEllipsisLoc(D.getEllipsisLoc()); 3371 CurrTL = CurrTL.getNextTypeLoc().getUnqualifiedLoc(); 3372 } 3373 3374 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 3375 while (isa<AttributedTypeLoc>(CurrTL)) { 3376 AttributedTypeLoc TL = cast<AttributedTypeLoc>(CurrTL); 3377 fillAttributedTypeLoc(TL, D.getTypeObject(i).getAttrs()); 3378 CurrTL = TL.getNextTypeLoc().getUnqualifiedLoc(); 3379 } 3380 3381 DeclaratorLocFiller(Context, D.getTypeObject(i)).Visit(CurrTL); 3382 CurrTL = CurrTL.getNextTypeLoc().getUnqualifiedLoc(); 3383 } 3384 3385 // If we have different source information for the return type, use 3386 // that. This really only applies to C++ conversion functions. 3387 if (ReturnTypeInfo) { 3388 TypeLoc TL = ReturnTypeInfo->getTypeLoc(); 3389 assert(TL.getFullDataSize() == CurrTL.getFullDataSize()); 3390 memcpy(CurrTL.getOpaqueData(), TL.getOpaqueData(), TL.getFullDataSize()); 3391 } else { 3392 TypeSpecLocFiller(Context, D.getDeclSpec()).Visit(CurrTL); 3393 } 3394 3395 return TInfo; 3396} 3397 3398/// \brief Create a LocInfoType to hold the given QualType and TypeSourceInfo. 3399ParsedType Sema::CreateParsedType(QualType T, TypeSourceInfo *TInfo) { 3400 // FIXME: LocInfoTypes are "transient", only needed for passing to/from Parser 3401 // and Sema during declaration parsing. Try deallocating/caching them when 3402 // it's appropriate, instead of allocating them and keeping them around. 3403 LocInfoType *LocT = (LocInfoType*)BumpAlloc.Allocate(sizeof(LocInfoType), 3404 TypeAlignment); 3405 new (LocT) LocInfoType(T, TInfo); 3406 assert(LocT->getTypeClass() != T->getTypeClass() && 3407 "LocInfoType's TypeClass conflicts with an existing Type class"); 3408 return ParsedType::make(QualType(LocT, 0)); 3409} 3410 3411void LocInfoType::getAsStringInternal(std::string &Str, 3412 const PrintingPolicy &Policy) const { 3413 llvm_unreachable("LocInfoType leaked into the type system; an opaque TypeTy*" 3414 " was used directly instead of getting the QualType through" 3415 " GetTypeFromParser"); 3416} 3417 3418TypeResult Sema::ActOnTypeName(Scope *S, Declarator &D) { 3419 // C99 6.7.6: Type names have no identifier. This is already validated by 3420 // the parser. 3421 assert(D.getIdentifier() == 0 && "Type name should have no identifier!"); 3422 3423 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 3424 QualType T = TInfo->getType(); 3425 if (D.isInvalidType()) 3426 return true; 3427 3428 // Make sure there are no unused decl attributes on the declarator. 3429 // We don't want to do this for ObjC parameters because we're going 3430 // to apply them to the actual parameter declaration. 3431 if (D.getContext() != Declarator::ObjCParameterContext) 3432 checkUnusedDeclAttributes(D); 3433 3434 if (getLangOpts().CPlusPlus) { 3435 // Check that there are no default arguments (C++ only). 3436 CheckExtraCXXDefaultArguments(D); 3437 } 3438 3439 return CreateParsedType(T, TInfo); 3440} 3441 3442ParsedType Sema::ActOnObjCInstanceType(SourceLocation Loc) { 3443 QualType T = Context.getObjCInstanceType(); 3444 TypeSourceInfo *TInfo = Context.getTrivialTypeSourceInfo(T, Loc); 3445 return CreateParsedType(T, TInfo); 3446} 3447 3448 3449//===----------------------------------------------------------------------===// 3450// Type Attribute Processing 3451//===----------------------------------------------------------------------===// 3452 3453/// HandleAddressSpaceTypeAttribute - Process an address_space attribute on the 3454/// specified type. The attribute contains 1 argument, the id of the address 3455/// space for the type. 3456static void HandleAddressSpaceTypeAttribute(QualType &Type, 3457 const AttributeList &Attr, Sema &S){ 3458 3459 // If this type is already address space qualified, reject it. 3460 // ISO/IEC TR 18037 S5.3 (amending C99 6.7.3): "No type shall be qualified by 3461 // qualifiers for two or more different address spaces." 3462 if (Type.getAddressSpace()) { 3463 S.Diag(Attr.getLoc(), diag::err_attribute_address_multiple_qualifiers); 3464 Attr.setInvalid(); 3465 return; 3466 } 3467 3468 // ISO/IEC TR 18037 S5.3 (amending C99 6.7.3): "A function type shall not be 3469 // qualified by an address-space qualifier." 3470 if (Type->isFunctionType()) { 3471 S.Diag(Attr.getLoc(), diag::err_attribute_address_function_type); 3472 Attr.setInvalid(); 3473 return; 3474 } 3475 3476 // Check the attribute arguments. 3477 if (Attr.getNumArgs() != 1) { 3478 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 3479 Attr.setInvalid(); 3480 return; 3481 } 3482 Expr *ASArgExpr = static_cast<Expr *>(Attr.getArg(0)); 3483 llvm::APSInt addrSpace(32); 3484 if (ASArgExpr->isTypeDependent() || ASArgExpr->isValueDependent() || 3485 !ASArgExpr->isIntegerConstantExpr(addrSpace, S.Context)) { 3486 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_not_int) 3487 << ASArgExpr->getSourceRange(); 3488 Attr.setInvalid(); 3489 return; 3490 } 3491 3492 // Bounds checking. 3493 if (addrSpace.isSigned()) { 3494 if (addrSpace.isNegative()) { 3495 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_negative) 3496 << ASArgExpr->getSourceRange(); 3497 Attr.setInvalid(); 3498 return; 3499 } 3500 addrSpace.setIsSigned(false); 3501 } 3502 llvm::APSInt max(addrSpace.getBitWidth()); 3503 max = Qualifiers::MaxAddressSpace; 3504 if (addrSpace > max) { 3505 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_too_high) 3506 << Qualifiers::MaxAddressSpace << ASArgExpr->getSourceRange(); 3507 Attr.setInvalid(); 3508 return; 3509 } 3510 3511 unsigned ASIdx = static_cast<unsigned>(addrSpace.getZExtValue()); 3512 Type = S.Context.getAddrSpaceQualType(Type, ASIdx); 3513} 3514 3515/// Does this type have a "direct" ownership qualifier? That is, 3516/// is it written like "__strong id", as opposed to something like 3517/// "typeof(foo)", where that happens to be strong? 3518static bool hasDirectOwnershipQualifier(QualType type) { 3519 // Fast path: no qualifier at all. 3520 assert(type.getQualifiers().hasObjCLifetime()); 3521 3522 while (true) { 3523 // __strong id 3524 if (const AttributedType *attr = dyn_cast<AttributedType>(type)) { 3525 if (attr->getAttrKind() == AttributedType::attr_objc_ownership) 3526 return true; 3527 3528 type = attr->getModifiedType(); 3529 3530 // X *__strong (...) 3531 } else if (const ParenType *paren = dyn_cast<ParenType>(type)) { 3532 type = paren->getInnerType(); 3533 3534 // That's it for things we want to complain about. In particular, 3535 // we do not want to look through typedefs, typeof(expr), 3536 // typeof(type), or any other way that the type is somehow 3537 // abstracted. 3538 } else { 3539 3540 return false; 3541 } 3542 } 3543} 3544 3545/// handleObjCOwnershipTypeAttr - Process an objc_ownership 3546/// attribute on the specified type. 3547/// 3548/// Returns 'true' if the attribute was handled. 3549static bool handleObjCOwnershipTypeAttr(TypeProcessingState &state, 3550 AttributeList &attr, 3551 QualType &type) { 3552 bool NonObjCPointer = false; 3553 3554 if (!type->isDependentType()) { 3555 if (const PointerType *ptr = type->getAs<PointerType>()) { 3556 QualType pointee = ptr->getPointeeType(); 3557 if (pointee->isObjCRetainableType() || pointee->isPointerType()) 3558 return false; 3559 // It is important not to lose the source info that there was an attribute 3560 // applied to non-objc pointer. We will create an attributed type but 3561 // its type will be the same as the original type. 3562 NonObjCPointer = true; 3563 } else if (!type->isObjCRetainableType()) { 3564 return false; 3565 } 3566 } 3567 3568 Sema &S = state.getSema(); 3569 SourceLocation AttrLoc = attr.getLoc(); 3570 if (AttrLoc.isMacroID()) 3571 AttrLoc = S.getSourceManager().getImmediateExpansionRange(AttrLoc).first; 3572 3573 if (!attr.getParameterName()) { 3574 S.Diag(AttrLoc, diag::err_attribute_argument_n_not_string) 3575 << "objc_ownership" << 1; 3576 attr.setInvalid(); 3577 return true; 3578 } 3579 3580 // Consume lifetime attributes without further comment outside of 3581 // ARC mode. 3582 if (!S.getLangOpts().ObjCAutoRefCount) 3583 return true; 3584 3585 Qualifiers::ObjCLifetime lifetime; 3586 if (attr.getParameterName()->isStr("none")) 3587 lifetime = Qualifiers::OCL_ExplicitNone; 3588 else if (attr.getParameterName()->isStr("strong")) 3589 lifetime = Qualifiers::OCL_Strong; 3590 else if (attr.getParameterName()->isStr("weak")) 3591 lifetime = Qualifiers::OCL_Weak; 3592 else if (attr.getParameterName()->isStr("autoreleasing")) 3593 lifetime = Qualifiers::OCL_Autoreleasing; 3594 else { 3595 S.Diag(AttrLoc, diag::warn_attribute_type_not_supported) 3596 << "objc_ownership" << attr.getParameterName(); 3597 attr.setInvalid(); 3598 return true; 3599 } 3600 3601 SplitQualType underlyingType = type.split(); 3602 3603 // Check for redundant/conflicting ownership qualifiers. 3604 if (Qualifiers::ObjCLifetime previousLifetime 3605 = type.getQualifiers().getObjCLifetime()) { 3606 // If it's written directly, that's an error. 3607 if (hasDirectOwnershipQualifier(type)) { 3608 S.Diag(AttrLoc, diag::err_attr_objc_ownership_redundant) 3609 << type; 3610 return true; 3611 } 3612 3613 // Otherwise, if the qualifiers actually conflict, pull sugar off 3614 // until we reach a type that is directly qualified. 3615 if (previousLifetime != lifetime) { 3616 // This should always terminate: the canonical type is 3617 // qualified, so some bit of sugar must be hiding it. 3618 while (!underlyingType.Quals.hasObjCLifetime()) { 3619 underlyingType = underlyingType.getSingleStepDesugaredType(); 3620 } 3621 underlyingType.Quals.removeObjCLifetime(); 3622 } 3623 } 3624 3625 underlyingType.Quals.addObjCLifetime(lifetime); 3626 3627 if (NonObjCPointer) { 3628 StringRef name = attr.getName()->getName(); 3629 switch (lifetime) { 3630 case Qualifiers::OCL_None: 3631 case Qualifiers::OCL_ExplicitNone: 3632 break; 3633 case Qualifiers::OCL_Strong: name = "__strong"; break; 3634 case Qualifiers::OCL_Weak: name = "__weak"; break; 3635 case Qualifiers::OCL_Autoreleasing: name = "__autoreleasing"; break; 3636 } 3637 S.Diag(AttrLoc, diag::warn_objc_object_attribute_wrong_type) 3638 << name << type; 3639 } 3640 3641 QualType origType = type; 3642 if (!NonObjCPointer) 3643 type = S.Context.getQualifiedType(underlyingType); 3644 3645 // If we have a valid source location for the attribute, use an 3646 // AttributedType instead. 3647 if (AttrLoc.isValid()) 3648 type = S.Context.getAttributedType(AttributedType::attr_objc_ownership, 3649 origType, type); 3650 3651 // Forbid __weak if the runtime doesn't support it. 3652 if (lifetime == Qualifiers::OCL_Weak && 3653 !S.getLangOpts().ObjCARCWeak && !NonObjCPointer) { 3654 3655 // Actually, delay this until we know what we're parsing. 3656 if (S.DelayedDiagnostics.shouldDelayDiagnostics()) { 3657 S.DelayedDiagnostics.add( 3658 sema::DelayedDiagnostic::makeForbiddenType( 3659 S.getSourceManager().getExpansionLoc(AttrLoc), 3660 diag::err_arc_weak_no_runtime, type, /*ignored*/ 0)); 3661 } else { 3662 S.Diag(AttrLoc, diag::err_arc_weak_no_runtime); 3663 } 3664 3665 attr.setInvalid(); 3666 return true; 3667 } 3668 3669 // Forbid __weak for class objects marked as 3670 // objc_arc_weak_reference_unavailable 3671 if (lifetime == Qualifiers::OCL_Weak) { 3672 QualType T = type; 3673 while (const PointerType *ptr = T->getAs<PointerType>()) 3674 T = ptr->getPointeeType(); 3675 if (const ObjCObjectPointerType *ObjT = T->getAs<ObjCObjectPointerType>()) { 3676 if (ObjCInterfaceDecl *Class = ObjT->getInterfaceDecl()) { 3677 if (Class->isArcWeakrefUnavailable()) { 3678 S.Diag(AttrLoc, diag::err_arc_unsupported_weak_class); 3679 S.Diag(ObjT->getInterfaceDecl()->getLocation(), 3680 diag::note_class_declared); 3681 } 3682 } 3683 } 3684 } 3685 3686 return true; 3687} 3688 3689/// handleObjCGCTypeAttr - Process the __attribute__((objc_gc)) type 3690/// attribute on the specified type. Returns true to indicate that 3691/// the attribute was handled, false to indicate that the type does 3692/// not permit the attribute. 3693static bool handleObjCGCTypeAttr(TypeProcessingState &state, 3694 AttributeList &attr, 3695 QualType &type) { 3696 Sema &S = state.getSema(); 3697 3698 // Delay if this isn't some kind of pointer. 3699 if (!type->isPointerType() && 3700 !type->isObjCObjectPointerType() && 3701 !type->isBlockPointerType()) 3702 return false; 3703 3704 if (type.getObjCGCAttr() != Qualifiers::GCNone) { 3705 S.Diag(attr.getLoc(), diag::err_attribute_multiple_objc_gc); 3706 attr.setInvalid(); 3707 return true; 3708 } 3709 3710 // Check the attribute arguments. 3711 if (!attr.getParameterName()) { 3712 S.Diag(attr.getLoc(), diag::err_attribute_argument_n_not_string) 3713 << "objc_gc" << 1; 3714 attr.setInvalid(); 3715 return true; 3716 } 3717 Qualifiers::GC GCAttr; 3718 if (attr.getNumArgs() != 0) { 3719 S.Diag(attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 3720 attr.setInvalid(); 3721 return true; 3722 } 3723 if (attr.getParameterName()->isStr("weak")) 3724 GCAttr = Qualifiers::Weak; 3725 else if (attr.getParameterName()->isStr("strong")) 3726 GCAttr = Qualifiers::Strong; 3727 else { 3728 S.Diag(attr.getLoc(), diag::warn_attribute_type_not_supported) 3729 << "objc_gc" << attr.getParameterName(); 3730 attr.setInvalid(); 3731 return true; 3732 } 3733 3734 QualType origType = type; 3735 type = S.Context.getObjCGCQualType(origType, GCAttr); 3736 3737 // Make an attributed type to preserve the source information. 3738 if (attr.getLoc().isValid()) 3739 type = S.Context.getAttributedType(AttributedType::attr_objc_gc, 3740 origType, type); 3741 3742 return true; 3743} 3744 3745namespace { 3746 /// A helper class to unwrap a type down to a function for the 3747 /// purposes of applying attributes there. 3748 /// 3749 /// Use: 3750 /// FunctionTypeUnwrapper unwrapped(SemaRef, T); 3751 /// if (unwrapped.isFunctionType()) { 3752 /// const FunctionType *fn = unwrapped.get(); 3753 /// // change fn somehow 3754 /// T = unwrapped.wrap(fn); 3755 /// } 3756 struct FunctionTypeUnwrapper { 3757 enum WrapKind { 3758 Desugar, 3759 Parens, 3760 Pointer, 3761 BlockPointer, 3762 Reference, 3763 MemberPointer 3764 }; 3765 3766 QualType Original; 3767 const FunctionType *Fn; 3768 SmallVector<unsigned char /*WrapKind*/, 8> Stack; 3769 3770 FunctionTypeUnwrapper(Sema &S, QualType T) : Original(T) { 3771 while (true) { 3772 const Type *Ty = T.getTypePtr(); 3773 if (isa<FunctionType>(Ty)) { 3774 Fn = cast<FunctionType>(Ty); 3775 return; 3776 } else if (isa<ParenType>(Ty)) { 3777 T = cast<ParenType>(Ty)->getInnerType(); 3778 Stack.push_back(Parens); 3779 } else if (isa<PointerType>(Ty)) { 3780 T = cast<PointerType>(Ty)->getPointeeType(); 3781 Stack.push_back(Pointer); 3782 } else if (isa<BlockPointerType>(Ty)) { 3783 T = cast<BlockPointerType>(Ty)->getPointeeType(); 3784 Stack.push_back(BlockPointer); 3785 } else if (isa<MemberPointerType>(Ty)) { 3786 T = cast<MemberPointerType>(Ty)->getPointeeType(); 3787 Stack.push_back(MemberPointer); 3788 } else if (isa<ReferenceType>(Ty)) { 3789 T = cast<ReferenceType>(Ty)->getPointeeType(); 3790 Stack.push_back(Reference); 3791 } else { 3792 const Type *DTy = Ty->getUnqualifiedDesugaredType(); 3793 if (Ty == DTy) { 3794 Fn = 0; 3795 return; 3796 } 3797 3798 T = QualType(DTy, 0); 3799 Stack.push_back(Desugar); 3800 } 3801 } 3802 } 3803 3804 bool isFunctionType() const { return (Fn != 0); } 3805 const FunctionType *get() const { return Fn; } 3806 3807 QualType wrap(Sema &S, const FunctionType *New) { 3808 // If T wasn't modified from the unwrapped type, do nothing. 3809 if (New == get()) return Original; 3810 3811 Fn = New; 3812 return wrap(S.Context, Original, 0); 3813 } 3814 3815 private: 3816 QualType wrap(ASTContext &C, QualType Old, unsigned I) { 3817 if (I == Stack.size()) 3818 return C.getQualifiedType(Fn, Old.getQualifiers()); 3819 3820 // Build up the inner type, applying the qualifiers from the old 3821 // type to the new type. 3822 SplitQualType SplitOld = Old.split(); 3823 3824 // As a special case, tail-recurse if there are no qualifiers. 3825 if (SplitOld.Quals.empty()) 3826 return wrap(C, SplitOld.Ty, I); 3827 return C.getQualifiedType(wrap(C, SplitOld.Ty, I), SplitOld.Quals); 3828 } 3829 3830 QualType wrap(ASTContext &C, const Type *Old, unsigned I) { 3831 if (I == Stack.size()) return QualType(Fn, 0); 3832 3833 switch (static_cast<WrapKind>(Stack[I++])) { 3834 case Desugar: 3835 // This is the point at which we potentially lose source 3836 // information. 3837 return wrap(C, Old->getUnqualifiedDesugaredType(), I); 3838 3839 case Parens: { 3840 QualType New = wrap(C, cast<ParenType>(Old)->getInnerType(), I); 3841 return C.getParenType(New); 3842 } 3843 3844 case Pointer: { 3845 QualType New = wrap(C, cast<PointerType>(Old)->getPointeeType(), I); 3846 return C.getPointerType(New); 3847 } 3848 3849 case BlockPointer: { 3850 QualType New = wrap(C, cast<BlockPointerType>(Old)->getPointeeType(),I); 3851 return C.getBlockPointerType(New); 3852 } 3853 3854 case MemberPointer: { 3855 const MemberPointerType *OldMPT = cast<MemberPointerType>(Old); 3856 QualType New = wrap(C, OldMPT->getPointeeType(), I); 3857 return C.getMemberPointerType(New, OldMPT->getClass()); 3858 } 3859 3860 case Reference: { 3861 const ReferenceType *OldRef = cast<ReferenceType>(Old); 3862 QualType New = wrap(C, OldRef->getPointeeType(), I); 3863 if (isa<LValueReferenceType>(OldRef)) 3864 return C.getLValueReferenceType(New, OldRef->isSpelledAsLValue()); 3865 else 3866 return C.getRValueReferenceType(New); 3867 } 3868 } 3869 3870 llvm_unreachable("unknown wrapping kind"); 3871 } 3872 }; 3873} 3874 3875/// Process an individual function attribute. Returns true to 3876/// indicate that the attribute was handled, false if it wasn't. 3877static bool handleFunctionTypeAttr(TypeProcessingState &state, 3878 AttributeList &attr, 3879 QualType &type) { 3880 Sema &S = state.getSema(); 3881 3882 FunctionTypeUnwrapper unwrapped(S, type); 3883 3884 if (attr.getKind() == AttributeList::AT_NoReturn) { 3885 if (S.CheckNoReturnAttr(attr)) 3886 return true; 3887 3888 // Delay if this is not a function type. 3889 if (!unwrapped.isFunctionType()) 3890 return false; 3891 3892 // Otherwise we can process right away. 3893 FunctionType::ExtInfo EI = unwrapped.get()->getExtInfo().withNoReturn(true); 3894 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 3895 return true; 3896 } 3897 3898 // ns_returns_retained is not always a type attribute, but if we got 3899 // here, we're treating it as one right now. 3900 if (attr.getKind() == AttributeList::AT_NSReturnsRetained) { 3901 assert(S.getLangOpts().ObjCAutoRefCount && 3902 "ns_returns_retained treated as type attribute in non-ARC"); 3903 if (attr.getNumArgs()) return true; 3904 3905 // Delay if this is not a function type. 3906 if (!unwrapped.isFunctionType()) 3907 return false; 3908 3909 FunctionType::ExtInfo EI 3910 = unwrapped.get()->getExtInfo().withProducesResult(true); 3911 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 3912 return true; 3913 } 3914 3915 if (attr.getKind() == AttributeList::AT_Regparm) { 3916 unsigned value; 3917 if (S.CheckRegparmAttr(attr, value)) 3918 return true; 3919 3920 // Delay if this is not a function type. 3921 if (!unwrapped.isFunctionType()) 3922 return false; 3923 3924 // Diagnose regparm with fastcall. 3925 const FunctionType *fn = unwrapped.get(); 3926 CallingConv CC = fn->getCallConv(); 3927 if (CC == CC_X86FastCall) { 3928 S.Diag(attr.getLoc(), diag::err_attributes_are_not_compatible) 3929 << FunctionType::getNameForCallConv(CC) 3930 << "regparm"; 3931 attr.setInvalid(); 3932 return true; 3933 } 3934 3935 FunctionType::ExtInfo EI = 3936 unwrapped.get()->getExtInfo().withRegParm(value); 3937 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 3938 return true; 3939 } 3940 3941 // Delay if the type didn't work out to a function. 3942 if (!unwrapped.isFunctionType()) return false; 3943 3944 // Otherwise, a calling convention. 3945 CallingConv CC; 3946 if (S.CheckCallingConvAttr(attr, CC)) 3947 return true; 3948 3949 const FunctionType *fn = unwrapped.get(); 3950 CallingConv CCOld = fn->getCallConv(); 3951 if (S.Context.getCanonicalCallConv(CC) == 3952 S.Context.getCanonicalCallConv(CCOld)) { 3953 FunctionType::ExtInfo EI= unwrapped.get()->getExtInfo().withCallingConv(CC); 3954 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 3955 return true; 3956 } 3957 3958 if (CCOld != (S.LangOpts.MRTD ? CC_X86StdCall : CC_Default)) { 3959 // Should we diagnose reapplications of the same convention? 3960 S.Diag(attr.getLoc(), diag::err_attributes_are_not_compatible) 3961 << FunctionType::getNameForCallConv(CC) 3962 << FunctionType::getNameForCallConv(CCOld); 3963 attr.setInvalid(); 3964 return true; 3965 } 3966 3967 // Diagnose the use of X86 fastcall on varargs or unprototyped functions. 3968 if (CC == CC_X86FastCall) { 3969 if (isa<FunctionNoProtoType>(fn)) { 3970 S.Diag(attr.getLoc(), diag::err_cconv_knr) 3971 << FunctionType::getNameForCallConv(CC); 3972 attr.setInvalid(); 3973 return true; 3974 } 3975 3976 const FunctionProtoType *FnP = cast<FunctionProtoType>(fn); 3977 if (FnP->isVariadic()) { 3978 S.Diag(attr.getLoc(), diag::err_cconv_varargs) 3979 << FunctionType::getNameForCallConv(CC); 3980 attr.setInvalid(); 3981 return true; 3982 } 3983 3984 // Also diagnose fastcall with regparm. 3985 if (fn->getHasRegParm()) { 3986 S.Diag(attr.getLoc(), diag::err_attributes_are_not_compatible) 3987 << "regparm" 3988 << FunctionType::getNameForCallConv(CC); 3989 attr.setInvalid(); 3990 return true; 3991 } 3992 } 3993 3994 FunctionType::ExtInfo EI = unwrapped.get()->getExtInfo().withCallingConv(CC); 3995 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 3996 return true; 3997} 3998 3999/// Handle OpenCL image access qualifiers: read_only, write_only, read_write 4000static void HandleOpenCLImageAccessAttribute(QualType& CurType, 4001 const AttributeList &Attr, 4002 Sema &S) { 4003 // Check the attribute arguments. 4004 if (Attr.getNumArgs() != 1) { 4005 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 4006 Attr.setInvalid(); 4007 return; 4008 } 4009 Expr *sizeExpr = static_cast<Expr *>(Attr.getArg(0)); 4010 llvm::APSInt arg(32); 4011 if (sizeExpr->isTypeDependent() || sizeExpr->isValueDependent() || 4012 !sizeExpr->isIntegerConstantExpr(arg, S.Context)) { 4013 S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int) 4014 << "opencl_image_access" << sizeExpr->getSourceRange(); 4015 Attr.setInvalid(); 4016 return; 4017 } 4018 unsigned iarg = static_cast<unsigned>(arg.getZExtValue()); 4019 switch (iarg) { 4020 case CLIA_read_only: 4021 case CLIA_write_only: 4022 case CLIA_read_write: 4023 // Implemented in a separate patch 4024 break; 4025 default: 4026 // Implemented in a separate patch 4027 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_size) 4028 << sizeExpr->getSourceRange(); 4029 Attr.setInvalid(); 4030 break; 4031 } 4032} 4033 4034/// HandleVectorSizeAttribute - this attribute is only applicable to integral 4035/// and float scalars, although arrays, pointers, and function return values are 4036/// allowed in conjunction with this construct. Aggregates with this attribute 4037/// are invalid, even if they are of the same size as a corresponding scalar. 4038/// The raw attribute should contain precisely 1 argument, the vector size for 4039/// the variable, measured in bytes. If curType and rawAttr are well formed, 4040/// this routine will return a new vector type. 4041static void HandleVectorSizeAttr(QualType& CurType, const AttributeList &Attr, 4042 Sema &S) { 4043 // Check the attribute arguments. 4044 if (Attr.getNumArgs() != 1) { 4045 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 4046 Attr.setInvalid(); 4047 return; 4048 } 4049 Expr *sizeExpr = static_cast<Expr *>(Attr.getArg(0)); 4050 llvm::APSInt vecSize(32); 4051 if (sizeExpr->isTypeDependent() || sizeExpr->isValueDependent() || 4052 !sizeExpr->isIntegerConstantExpr(vecSize, S.Context)) { 4053 S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int) 4054 << "vector_size" << sizeExpr->getSourceRange(); 4055 Attr.setInvalid(); 4056 return; 4057 } 4058 // the base type must be integer or float, and can't already be a vector. 4059 if (!CurType->isIntegerType() && !CurType->isRealFloatingType()) { 4060 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_vector_type) << CurType; 4061 Attr.setInvalid(); 4062 return; 4063 } 4064 unsigned typeSize = static_cast<unsigned>(S.Context.getTypeSize(CurType)); 4065 // vecSize is specified in bytes - convert to bits. 4066 unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue() * 8); 4067 4068 // the vector size needs to be an integral multiple of the type size. 4069 if (vectorSize % typeSize) { 4070 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_size) 4071 << sizeExpr->getSourceRange(); 4072 Attr.setInvalid(); 4073 return; 4074 } 4075 if (vectorSize == 0) { 4076 S.Diag(Attr.getLoc(), diag::err_attribute_zero_size) 4077 << sizeExpr->getSourceRange(); 4078 Attr.setInvalid(); 4079 return; 4080 } 4081 4082 // Success! Instantiate the vector type, the number of elements is > 0, and 4083 // not required to be a power of 2, unlike GCC. 4084 CurType = S.Context.getVectorType(CurType, vectorSize/typeSize, 4085 VectorType::GenericVector); 4086} 4087 4088/// \brief Process the OpenCL-like ext_vector_type attribute when it occurs on 4089/// a type. 4090static void HandleExtVectorTypeAttr(QualType &CurType, 4091 const AttributeList &Attr, 4092 Sema &S) { 4093 Expr *sizeExpr; 4094 4095 // Special case where the argument is a template id. 4096 if (Attr.getParameterName()) { 4097 CXXScopeSpec SS; 4098 SourceLocation TemplateKWLoc; 4099 UnqualifiedId id; 4100 id.setIdentifier(Attr.getParameterName(), Attr.getLoc()); 4101 4102 ExprResult Size = S.ActOnIdExpression(S.getCurScope(), SS, TemplateKWLoc, 4103 id, false, false); 4104 if (Size.isInvalid()) 4105 return; 4106 4107 sizeExpr = Size.get(); 4108 } else { 4109 // check the attribute arguments. 4110 if (Attr.getNumArgs() != 1) { 4111 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 4112 return; 4113 } 4114 sizeExpr = Attr.getArg(0); 4115 } 4116 4117 // Create the vector type. 4118 QualType T = S.BuildExtVectorType(CurType, sizeExpr, Attr.getLoc()); 4119 if (!T.isNull()) 4120 CurType = T; 4121} 4122 4123/// HandleNeonVectorTypeAttr - The "neon_vector_type" and 4124/// "neon_polyvector_type" attributes are used to create vector types that 4125/// are mangled according to ARM's ABI. Otherwise, these types are identical 4126/// to those created with the "vector_size" attribute. Unlike "vector_size" 4127/// the argument to these Neon attributes is the number of vector elements, 4128/// not the vector size in bytes. The vector width and element type must 4129/// match one of the standard Neon vector types. 4130static void HandleNeonVectorTypeAttr(QualType& CurType, 4131 const AttributeList &Attr, Sema &S, 4132 VectorType::VectorKind VecKind, 4133 const char *AttrName) { 4134 // Check the attribute arguments. 4135 if (Attr.getNumArgs() != 1) { 4136 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 4137 Attr.setInvalid(); 4138 return; 4139 } 4140 // The number of elements must be an ICE. 4141 Expr *numEltsExpr = static_cast<Expr *>(Attr.getArg(0)); 4142 llvm::APSInt numEltsInt(32); 4143 if (numEltsExpr->isTypeDependent() || numEltsExpr->isValueDependent() || 4144 !numEltsExpr->isIntegerConstantExpr(numEltsInt, S.Context)) { 4145 S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int) 4146 << AttrName << numEltsExpr->getSourceRange(); 4147 Attr.setInvalid(); 4148 return; 4149 } 4150 // Only certain element types are supported for Neon vectors. 4151 const BuiltinType* BTy = CurType->getAs<BuiltinType>(); 4152 if (!BTy || 4153 (VecKind == VectorType::NeonPolyVector && 4154 BTy->getKind() != BuiltinType::SChar && 4155 BTy->getKind() != BuiltinType::Short) || 4156 (BTy->getKind() != BuiltinType::SChar && 4157 BTy->getKind() != BuiltinType::UChar && 4158 BTy->getKind() != BuiltinType::Short && 4159 BTy->getKind() != BuiltinType::UShort && 4160 BTy->getKind() != BuiltinType::Int && 4161 BTy->getKind() != BuiltinType::UInt && 4162 BTy->getKind() != BuiltinType::LongLong && 4163 BTy->getKind() != BuiltinType::ULongLong && 4164 BTy->getKind() != BuiltinType::Float)) { 4165 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_vector_type) <<CurType; 4166 Attr.setInvalid(); 4167 return; 4168 } 4169 // The total size of the vector must be 64 or 128 bits. 4170 unsigned typeSize = static_cast<unsigned>(S.Context.getTypeSize(CurType)); 4171 unsigned numElts = static_cast<unsigned>(numEltsInt.getZExtValue()); 4172 unsigned vecSize = typeSize * numElts; 4173 if (vecSize != 64 && vecSize != 128) { 4174 S.Diag(Attr.getLoc(), diag::err_attribute_bad_neon_vector_size) << CurType; 4175 Attr.setInvalid(); 4176 return; 4177 } 4178 4179 CurType = S.Context.getVectorType(CurType, numElts, VecKind); 4180} 4181 4182static void processTypeAttrs(TypeProcessingState &state, QualType &type, 4183 TypeAttrLocation TAL, AttributeList *attrs) { 4184 // Scan through and apply attributes to this type where it makes sense. Some 4185 // attributes (such as __address_space__, __vector_size__, etc) apply to the 4186 // type, but others can be present in the type specifiers even though they 4187 // apply to the decl. Here we apply type attributes and ignore the rest. 4188 4189 AttributeList *next; 4190 do { 4191 AttributeList &attr = *attrs; 4192 next = attr.getNext(); 4193 4194 // Skip attributes that were marked to be invalid. 4195 if (attr.isInvalid()) 4196 continue; 4197 4198 if (attr.isCXX11Attribute()) { 4199 // [[gnu::...]] attributes are treated as declaration attributes, so may 4200 // not appertain to a DeclaratorChunk, even if we handle them as type 4201 // attributes. 4202 if (attr.getScopeName() && attr.getScopeName()->isStr("gnu")) { 4203 if (TAL == TAL_DeclChunk) { 4204 state.getSema().Diag(attr.getLoc(), 4205 diag::warn_cxx11_gnu_attribute_on_type) 4206 << attr.getName(); 4207 continue; 4208 } 4209 } else if (TAL != TAL_DeclChunk) { 4210 // Otherwise, only consider type processing for a C++11 attribute if 4211 // it's actually been applied to a type. 4212 continue; 4213 } 4214 } 4215 4216 // If this is an attribute we can handle, do so now, 4217 // otherwise, add it to the FnAttrs list for rechaining. 4218 switch (attr.getKind()) { 4219 default: 4220 // A C++11 attribute on a declarator chunk must appertain to a type. 4221 if (attr.isCXX11Attribute() && TAL == TAL_DeclChunk) 4222 state.getSema().Diag(attr.getLoc(), diag::err_attribute_not_type_attr) 4223 << attr.getName()->getName(); 4224 break; 4225 4226 case AttributeList::UnknownAttribute: 4227 if (attr.isCXX11Attribute() && TAL == TAL_DeclChunk) 4228 state.getSema().Diag(attr.getLoc(), 4229 diag::warn_unknown_attribute_ignored) 4230 << attr.getName(); 4231 break; 4232 4233 case AttributeList::IgnoredAttribute: 4234 break; 4235 4236 case AttributeList::AT_MayAlias: 4237 // FIXME: This attribute needs to actually be handled, but if we ignore 4238 // it it breaks large amounts of Linux software. 4239 attr.setUsedAsTypeAttr(); 4240 break; 4241 case AttributeList::AT_AddressSpace: 4242 HandleAddressSpaceTypeAttribute(type, attr, state.getSema()); 4243 attr.setUsedAsTypeAttr(); 4244 break; 4245 OBJC_POINTER_TYPE_ATTRS_CASELIST: 4246 if (!handleObjCPointerTypeAttr(state, attr, type)) 4247 distributeObjCPointerTypeAttr(state, attr, type); 4248 attr.setUsedAsTypeAttr(); 4249 break; 4250 case AttributeList::AT_VectorSize: 4251 HandleVectorSizeAttr(type, attr, state.getSema()); 4252 attr.setUsedAsTypeAttr(); 4253 break; 4254 case AttributeList::AT_ExtVectorType: 4255 HandleExtVectorTypeAttr(type, attr, state.getSema()); 4256 attr.setUsedAsTypeAttr(); 4257 break; 4258 case AttributeList::AT_NeonVectorType: 4259 HandleNeonVectorTypeAttr(type, attr, state.getSema(), 4260 VectorType::NeonVector, "neon_vector_type"); 4261 attr.setUsedAsTypeAttr(); 4262 break; 4263 case AttributeList::AT_NeonPolyVectorType: 4264 HandleNeonVectorTypeAttr(type, attr, state.getSema(), 4265 VectorType::NeonPolyVector, 4266 "neon_polyvector_type"); 4267 attr.setUsedAsTypeAttr(); 4268 break; 4269 case AttributeList::AT_OpenCLImageAccess: 4270 HandleOpenCLImageAccessAttribute(type, attr, state.getSema()); 4271 attr.setUsedAsTypeAttr(); 4272 break; 4273 4274 case AttributeList::AT_Win64: 4275 case AttributeList::AT_Ptr32: 4276 case AttributeList::AT_Ptr64: 4277 // FIXME: don't ignore these 4278 attr.setUsedAsTypeAttr(); 4279 break; 4280 4281 case AttributeList::AT_NSReturnsRetained: 4282 if (!state.getSema().getLangOpts().ObjCAutoRefCount) 4283 break; 4284 // fallthrough into the function attrs 4285 4286 FUNCTION_TYPE_ATTRS_CASELIST: 4287 attr.setUsedAsTypeAttr(); 4288 4289 // Never process function type attributes as part of the 4290 // declaration-specifiers. 4291 if (TAL == TAL_DeclSpec) 4292 distributeFunctionTypeAttrFromDeclSpec(state, attr, type); 4293 4294 // Otherwise, handle the possible delays. 4295 else if (!handleFunctionTypeAttr(state, attr, type)) 4296 distributeFunctionTypeAttr(state, attr, type); 4297 break; 4298 } 4299 } while ((attrs = next)); 4300} 4301 4302/// \brief Ensure that the type of the given expression is complete. 4303/// 4304/// This routine checks whether the expression \p E has a complete type. If the 4305/// expression refers to an instantiable construct, that instantiation is 4306/// performed as needed to complete its type. Furthermore 4307/// Sema::RequireCompleteType is called for the expression's type (or in the 4308/// case of a reference type, the referred-to type). 4309/// 4310/// \param E The expression whose type is required to be complete. 4311/// \param Diagnoser The object that will emit a diagnostic if the type is 4312/// incomplete. 4313/// 4314/// \returns \c true if the type of \p E is incomplete and diagnosed, \c false 4315/// otherwise. 4316bool Sema::RequireCompleteExprType(Expr *E, TypeDiagnoser &Diagnoser){ 4317 QualType T = E->getType(); 4318 4319 // Fast path the case where the type is already complete. 4320 if (!T->isIncompleteType()) 4321 return false; 4322 4323 // Incomplete array types may be completed by the initializer attached to 4324 // their definitions. For static data members of class templates we need to 4325 // instantiate the definition to get this initializer and complete the type. 4326 if (T->isIncompleteArrayType()) { 4327 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E->IgnoreParens())) { 4328 if (VarDecl *Var = dyn_cast<VarDecl>(DRE->getDecl())) { 4329 if (Var->isStaticDataMember() && 4330 Var->getInstantiatedFromStaticDataMember()) { 4331 4332 MemberSpecializationInfo *MSInfo = Var->getMemberSpecializationInfo(); 4333 assert(MSInfo && "Missing member specialization information?"); 4334 if (MSInfo->getTemplateSpecializationKind() 4335 != TSK_ExplicitSpecialization) { 4336 // If we don't already have a point of instantiation, this is it. 4337 if (MSInfo->getPointOfInstantiation().isInvalid()) { 4338 MSInfo->setPointOfInstantiation(E->getLocStart()); 4339 4340 // This is a modification of an existing AST node. Notify 4341 // listeners. 4342 if (ASTMutationListener *L = getASTMutationListener()) 4343 L->StaticDataMemberInstantiated(Var); 4344 } 4345 4346 InstantiateStaticDataMemberDefinition(E->getExprLoc(), Var); 4347 4348 // Update the type to the newly instantiated definition's type both 4349 // here and within the expression. 4350 if (VarDecl *Def = Var->getDefinition()) { 4351 DRE->setDecl(Def); 4352 T = Def->getType(); 4353 DRE->setType(T); 4354 E->setType(T); 4355 } 4356 } 4357 4358 // We still go on to try to complete the type independently, as it 4359 // may also require instantiations or diagnostics if it remains 4360 // incomplete. 4361 } 4362 } 4363 } 4364 } 4365 4366 // FIXME: Are there other cases which require instantiating something other 4367 // than the type to complete the type of an expression? 4368 4369 // Look through reference types and complete the referred type. 4370 if (const ReferenceType *Ref = T->getAs<ReferenceType>()) 4371 T = Ref->getPointeeType(); 4372 4373 return RequireCompleteType(E->getExprLoc(), T, Diagnoser); 4374} 4375 4376namespace { 4377 struct TypeDiagnoserDiag : Sema::TypeDiagnoser { 4378 unsigned DiagID; 4379 4380 TypeDiagnoserDiag(unsigned DiagID) 4381 : Sema::TypeDiagnoser(DiagID == 0), DiagID(DiagID) {} 4382 4383 virtual void diagnose(Sema &S, SourceLocation Loc, QualType T) { 4384 if (Suppressed) return; 4385 S.Diag(Loc, DiagID) << T; 4386 } 4387 }; 4388} 4389 4390bool Sema::RequireCompleteExprType(Expr *E, unsigned DiagID) { 4391 TypeDiagnoserDiag Diagnoser(DiagID); 4392 return RequireCompleteExprType(E, Diagnoser); 4393} 4394 4395/// @brief Ensure that the type T is a complete type. 4396/// 4397/// This routine checks whether the type @p T is complete in any 4398/// context where a complete type is required. If @p T is a complete 4399/// type, returns false. If @p T is a class template specialization, 4400/// this routine then attempts to perform class template 4401/// instantiation. If instantiation fails, or if @p T is incomplete 4402/// and cannot be completed, issues the diagnostic @p diag (giving it 4403/// the type @p T) and returns true. 4404/// 4405/// @param Loc The location in the source that the incomplete type 4406/// diagnostic should refer to. 4407/// 4408/// @param T The type that this routine is examining for completeness. 4409/// 4410/// @returns @c true if @p T is incomplete and a diagnostic was emitted, 4411/// @c false otherwise. 4412bool Sema::RequireCompleteType(SourceLocation Loc, QualType T, 4413 TypeDiagnoser &Diagnoser) { 4414 // FIXME: Add this assertion to make sure we always get instantiation points. 4415 // assert(!Loc.isInvalid() && "Invalid location in RequireCompleteType"); 4416 // FIXME: Add this assertion to help us flush out problems with 4417 // checking for dependent types and type-dependent expressions. 4418 // 4419 // assert(!T->isDependentType() && 4420 // "Can't ask whether a dependent type is complete"); 4421 4422 // If we have a complete type, we're done. 4423 NamedDecl *Def = 0; 4424 if (!T->isIncompleteType(&Def)) { 4425 // If we know about the definition but it is not visible, complain. 4426 if (!Diagnoser.Suppressed && Def && !LookupResult::isVisible(Def)) { 4427 // Suppress this error outside of a SFINAE context if we've already 4428 // emitted the error once for this type. There's no usefulness in 4429 // repeating the diagnostic. 4430 // FIXME: Add a Fix-It that imports the corresponding module or includes 4431 // the header. 4432 Module *Owner = Def->getOwningModule(); 4433 Diag(Loc, diag::err_module_private_definition) 4434 << T << Owner->getFullModuleName(); 4435 Diag(Def->getLocation(), diag::note_previous_definition); 4436 4437 if (!isSFINAEContext()) { 4438 // Recover by implicitly importing this module. 4439 createImplicitModuleImport(Loc, Owner); 4440 } 4441 } 4442 4443 return false; 4444 } 4445 4446 const TagType *Tag = T->getAs<TagType>(); 4447 const ObjCInterfaceType *IFace = 0; 4448 4449 if (Tag) { 4450 // Avoid diagnosing invalid decls as incomplete. 4451 if (Tag->getDecl()->isInvalidDecl()) 4452 return true; 4453 4454 // Give the external AST source a chance to complete the type. 4455 if (Tag->getDecl()->hasExternalLexicalStorage()) { 4456 Context.getExternalSource()->CompleteType(Tag->getDecl()); 4457 if (!Tag->isIncompleteType()) 4458 return false; 4459 } 4460 } 4461 else if ((IFace = T->getAs<ObjCInterfaceType>())) { 4462 // Avoid diagnosing invalid decls as incomplete. 4463 if (IFace->getDecl()->isInvalidDecl()) 4464 return true; 4465 4466 // Give the external AST source a chance to complete the type. 4467 if (IFace->getDecl()->hasExternalLexicalStorage()) { 4468 Context.getExternalSource()->CompleteType(IFace->getDecl()); 4469 if (!IFace->isIncompleteType()) 4470 return false; 4471 } 4472 } 4473 4474 // If we have a class template specialization or a class member of a 4475 // class template specialization, or an array with known size of such, 4476 // try to instantiate it. 4477 QualType MaybeTemplate = T; 4478 while (const ConstantArrayType *Array 4479 = Context.getAsConstantArrayType(MaybeTemplate)) 4480 MaybeTemplate = Array->getElementType(); 4481 if (const RecordType *Record = MaybeTemplate->getAs<RecordType>()) { 4482 if (ClassTemplateSpecializationDecl *ClassTemplateSpec 4483 = dyn_cast<ClassTemplateSpecializationDecl>(Record->getDecl())) { 4484 if (ClassTemplateSpec->getSpecializationKind() == TSK_Undeclared) 4485 return InstantiateClassTemplateSpecialization(Loc, ClassTemplateSpec, 4486 TSK_ImplicitInstantiation, 4487 /*Complain=*/!Diagnoser.Suppressed); 4488 } else if (CXXRecordDecl *Rec 4489 = dyn_cast<CXXRecordDecl>(Record->getDecl())) { 4490 CXXRecordDecl *Pattern = Rec->getInstantiatedFromMemberClass(); 4491 if (!Rec->isBeingDefined() && Pattern) { 4492 MemberSpecializationInfo *MSI = Rec->getMemberSpecializationInfo(); 4493 assert(MSI && "Missing member specialization information?"); 4494 // This record was instantiated from a class within a template. 4495 if (MSI->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 4496 return InstantiateClass(Loc, Rec, Pattern, 4497 getTemplateInstantiationArgs(Rec), 4498 TSK_ImplicitInstantiation, 4499 /*Complain=*/!Diagnoser.Suppressed); 4500 } 4501 } 4502 } 4503 4504 if (Diagnoser.Suppressed) 4505 return true; 4506 4507 // We have an incomplete type. Produce a diagnostic. 4508 Diagnoser.diagnose(*this, Loc, T); 4509 4510 // If the type was a forward declaration of a class/struct/union 4511 // type, produce a note. 4512 if (Tag && !Tag->getDecl()->isInvalidDecl()) 4513 Diag(Tag->getDecl()->getLocation(), 4514 Tag->isBeingDefined() ? diag::note_type_being_defined 4515 : diag::note_forward_declaration) 4516 << QualType(Tag, 0); 4517 4518 // If the Objective-C class was a forward declaration, produce a note. 4519 if (IFace && !IFace->getDecl()->isInvalidDecl()) 4520 Diag(IFace->getDecl()->getLocation(), diag::note_forward_class); 4521 4522 return true; 4523} 4524 4525bool Sema::RequireCompleteType(SourceLocation Loc, QualType T, 4526 unsigned DiagID) { 4527 TypeDiagnoserDiag Diagnoser(DiagID); 4528 return RequireCompleteType(Loc, T, Diagnoser); 4529} 4530 4531/// \brief Get diagnostic %select index for tag kind for 4532/// literal type diagnostic message. 4533/// WARNING: Indexes apply to particular diagnostics only! 4534/// 4535/// \returns diagnostic %select index. 4536static unsigned getLiteralDiagFromTagKind(TagTypeKind Tag) { 4537 switch (Tag) { 4538 case TTK_Struct: return 0; 4539 case TTK_Interface: return 1; 4540 case TTK_Class: return 2; 4541 default: llvm_unreachable("Invalid tag kind for literal type diagnostic!"); 4542 } 4543} 4544 4545/// @brief Ensure that the type T is a literal type. 4546/// 4547/// This routine checks whether the type @p T is a literal type. If @p T is an 4548/// incomplete type, an attempt is made to complete it. If @p T is a literal 4549/// type, or @p AllowIncompleteType is true and @p T is an incomplete type, 4550/// returns false. Otherwise, this routine issues the diagnostic @p PD (giving 4551/// it the type @p T), along with notes explaining why the type is not a 4552/// literal type, and returns true. 4553/// 4554/// @param Loc The location in the source that the non-literal type 4555/// diagnostic should refer to. 4556/// 4557/// @param T The type that this routine is examining for literalness. 4558/// 4559/// @param Diagnoser Emits a diagnostic if T is not a literal type. 4560/// 4561/// @returns @c true if @p T is not a literal type and a diagnostic was emitted, 4562/// @c false otherwise. 4563bool Sema::RequireLiteralType(SourceLocation Loc, QualType T, 4564 TypeDiagnoser &Diagnoser) { 4565 assert(!T->isDependentType() && "type should not be dependent"); 4566 4567 QualType ElemType = Context.getBaseElementType(T); 4568 RequireCompleteType(Loc, ElemType, 0); 4569 4570 if (T->isLiteralType()) 4571 return false; 4572 4573 if (Diagnoser.Suppressed) 4574 return true; 4575 4576 Diagnoser.diagnose(*this, Loc, T); 4577 4578 if (T->isVariableArrayType()) 4579 return true; 4580 4581 const RecordType *RT = ElemType->getAs<RecordType>(); 4582 if (!RT) 4583 return true; 4584 4585 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 4586 4587 // A partially-defined class type can't be a literal type, because a literal 4588 // class type must have a trivial destructor (which can't be checked until 4589 // the class definition is complete). 4590 if (!RD->isCompleteDefinition()) { 4591 RequireCompleteType(Loc, ElemType, diag::note_non_literal_incomplete, T); 4592 return true; 4593 } 4594 4595 // If the class has virtual base classes, then it's not an aggregate, and 4596 // cannot have any constexpr constructors or a trivial default constructor, 4597 // so is non-literal. This is better to diagnose than the resulting absence 4598 // of constexpr constructors. 4599 if (RD->getNumVBases()) { 4600 Diag(RD->getLocation(), diag::note_non_literal_virtual_base) 4601 << getLiteralDiagFromTagKind(RD->getTagKind()) << RD->getNumVBases(); 4602 for (CXXRecordDecl::base_class_const_iterator I = RD->vbases_begin(), 4603 E = RD->vbases_end(); I != E; ++I) 4604 Diag(I->getLocStart(), 4605 diag::note_constexpr_virtual_base_here) << I->getSourceRange(); 4606 } else if (!RD->isAggregate() && !RD->hasConstexprNonCopyMoveConstructor() && 4607 !RD->hasTrivialDefaultConstructor()) { 4608 Diag(RD->getLocation(), diag::note_non_literal_no_constexpr_ctors) << RD; 4609 } else if (RD->hasNonLiteralTypeFieldsOrBases()) { 4610 for (CXXRecordDecl::base_class_const_iterator I = RD->bases_begin(), 4611 E = RD->bases_end(); I != E; ++I) { 4612 if (!I->getType()->isLiteralType()) { 4613 Diag(I->getLocStart(), 4614 diag::note_non_literal_base_class) 4615 << RD << I->getType() << I->getSourceRange(); 4616 return true; 4617 } 4618 } 4619 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 4620 E = RD->field_end(); I != E; ++I) { 4621 if (!I->getType()->isLiteralType() || 4622 I->getType().isVolatileQualified()) { 4623 Diag(I->getLocation(), diag::note_non_literal_field) 4624 << RD << *I << I->getType() 4625 << I->getType().isVolatileQualified(); 4626 return true; 4627 } 4628 } 4629 } else if (!RD->hasTrivialDestructor()) { 4630 // All fields and bases are of literal types, so have trivial destructors. 4631 // If this class's destructor is non-trivial it must be user-declared. 4632 CXXDestructorDecl *Dtor = RD->getDestructor(); 4633 assert(Dtor && "class has literal fields and bases but no dtor?"); 4634 if (!Dtor) 4635 return true; 4636 4637 Diag(Dtor->getLocation(), Dtor->isUserProvided() ? 4638 diag::note_non_literal_user_provided_dtor : 4639 diag::note_non_literal_nontrivial_dtor) << RD; 4640 if (!Dtor->isUserProvided()) 4641 SpecialMemberIsTrivial(Dtor, CXXDestructor, /*Diagnose*/true); 4642 } 4643 4644 return true; 4645} 4646 4647bool Sema::RequireLiteralType(SourceLocation Loc, QualType T, unsigned DiagID) { 4648 TypeDiagnoserDiag Diagnoser(DiagID); 4649 return RequireLiteralType(Loc, T, Diagnoser); 4650} 4651 4652/// \brief Retrieve a version of the type 'T' that is elaborated by Keyword 4653/// and qualified by the nested-name-specifier contained in SS. 4654QualType Sema::getElaboratedType(ElaboratedTypeKeyword Keyword, 4655 const CXXScopeSpec &SS, QualType T) { 4656 if (T.isNull()) 4657 return T; 4658 NestedNameSpecifier *NNS; 4659 if (SS.isValid()) 4660 NNS = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 4661 else { 4662 if (Keyword == ETK_None) 4663 return T; 4664 NNS = 0; 4665 } 4666 return Context.getElaboratedType(Keyword, NNS, T); 4667} 4668 4669QualType Sema::BuildTypeofExprType(Expr *E, SourceLocation Loc) { 4670 ExprResult ER = CheckPlaceholderExpr(E); 4671 if (ER.isInvalid()) return QualType(); 4672 E = ER.take(); 4673 4674 if (!E->isTypeDependent()) { 4675 QualType T = E->getType(); 4676 if (const TagType *TT = T->getAs<TagType>()) 4677 DiagnoseUseOfDecl(TT->getDecl(), E->getExprLoc()); 4678 } 4679 return Context.getTypeOfExprType(E); 4680} 4681 4682/// getDecltypeForExpr - Given an expr, will return the decltype for 4683/// that expression, according to the rules in C++11 4684/// [dcl.type.simple]p4 and C++11 [expr.lambda.prim]p18. 4685static QualType getDecltypeForExpr(Sema &S, Expr *E) { 4686 if (E->isTypeDependent()) 4687 return S.Context.DependentTy; 4688 4689 // C++11 [dcl.type.simple]p4: 4690 // The type denoted by decltype(e) is defined as follows: 4691 // 4692 // - if e is an unparenthesized id-expression or an unparenthesized class 4693 // member access (5.2.5), decltype(e) is the type of the entity named 4694 // by e. If there is no such entity, or if e names a set of overloaded 4695 // functions, the program is ill-formed; 4696 // 4697 // We apply the same rules for Objective-C ivar and property references. 4698 if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E)) { 4699 if (const ValueDecl *VD = dyn_cast<ValueDecl>(DRE->getDecl())) 4700 return VD->getType(); 4701 } else if (const MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 4702 if (const FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl())) 4703 return FD->getType(); 4704 } else if (const ObjCIvarRefExpr *IR = dyn_cast<ObjCIvarRefExpr>(E)) { 4705 return IR->getDecl()->getType(); 4706 } else if (const ObjCPropertyRefExpr *PR = dyn_cast<ObjCPropertyRefExpr>(E)) { 4707 if (PR->isExplicitProperty()) 4708 return PR->getExplicitProperty()->getType(); 4709 } 4710 4711 // C++11 [expr.lambda.prim]p18: 4712 // Every occurrence of decltype((x)) where x is a possibly 4713 // parenthesized id-expression that names an entity of automatic 4714 // storage duration is treated as if x were transformed into an 4715 // access to a corresponding data member of the closure type that 4716 // would have been declared if x were an odr-use of the denoted 4717 // entity. 4718 using namespace sema; 4719 if (S.getCurLambda()) { 4720 if (isa<ParenExpr>(E)) { 4721 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E->IgnoreParens())) { 4722 if (VarDecl *Var = dyn_cast<VarDecl>(DRE->getDecl())) { 4723 QualType T = S.getCapturedDeclRefType(Var, DRE->getLocation()); 4724 if (!T.isNull()) 4725 return S.Context.getLValueReferenceType(T); 4726 } 4727 } 4728 } 4729 } 4730 4731 4732 // C++11 [dcl.type.simple]p4: 4733 // [...] 4734 QualType T = E->getType(); 4735 switch (E->getValueKind()) { 4736 // - otherwise, if e is an xvalue, decltype(e) is T&&, where T is the 4737 // type of e; 4738 case VK_XValue: T = S.Context.getRValueReferenceType(T); break; 4739 // - otherwise, if e is an lvalue, decltype(e) is T&, where T is the 4740 // type of e; 4741 case VK_LValue: T = S.Context.getLValueReferenceType(T); break; 4742 // - otherwise, decltype(e) is the type of e. 4743 case VK_RValue: break; 4744 } 4745 4746 return T; 4747} 4748 4749QualType Sema::BuildDecltypeType(Expr *E, SourceLocation Loc) { 4750 ExprResult ER = CheckPlaceholderExpr(E); 4751 if (ER.isInvalid()) return QualType(); 4752 E = ER.take(); 4753 4754 return Context.getDecltypeType(E, getDecltypeForExpr(*this, E)); 4755} 4756 4757QualType Sema::BuildUnaryTransformType(QualType BaseType, 4758 UnaryTransformType::UTTKind UKind, 4759 SourceLocation Loc) { 4760 switch (UKind) { 4761 case UnaryTransformType::EnumUnderlyingType: 4762 if (!BaseType->isDependentType() && !BaseType->isEnumeralType()) { 4763 Diag(Loc, diag::err_only_enums_have_underlying_types); 4764 return QualType(); 4765 } else { 4766 QualType Underlying = BaseType; 4767 if (!BaseType->isDependentType()) { 4768 EnumDecl *ED = BaseType->getAs<EnumType>()->getDecl(); 4769 assert(ED && "EnumType has no EnumDecl"); 4770 DiagnoseUseOfDecl(ED, Loc); 4771 Underlying = ED->getIntegerType(); 4772 } 4773 assert(!Underlying.isNull()); 4774 return Context.getUnaryTransformType(BaseType, Underlying, 4775 UnaryTransformType::EnumUnderlyingType); 4776 } 4777 } 4778 llvm_unreachable("unknown unary transform type"); 4779} 4780 4781QualType Sema::BuildAtomicType(QualType T, SourceLocation Loc) { 4782 if (!T->isDependentType()) { 4783 // FIXME: It isn't entirely clear whether incomplete atomic types 4784 // are allowed or not; for simplicity, ban them for the moment. 4785 if (RequireCompleteType(Loc, T, diag::err_atomic_specifier_bad_type, 0)) 4786 return QualType(); 4787 4788 int DisallowedKind = -1; 4789 if (T->isArrayType()) 4790 DisallowedKind = 1; 4791 else if (T->isFunctionType()) 4792 DisallowedKind = 2; 4793 else if (T->isReferenceType()) 4794 DisallowedKind = 3; 4795 else if (T->isAtomicType()) 4796 DisallowedKind = 4; 4797 else if (T.hasQualifiers()) 4798 DisallowedKind = 5; 4799 else if (!T.isTriviallyCopyableType(Context)) 4800 // Some other non-trivially-copyable type (probably a C++ class) 4801 DisallowedKind = 6; 4802 4803 if (DisallowedKind != -1) { 4804 Diag(Loc, diag::err_atomic_specifier_bad_type) << DisallowedKind << T; 4805 return QualType(); 4806 } 4807 4808 // FIXME: Do we need any handling for ARC here? 4809 } 4810 4811 // Build the pointer type. 4812 return Context.getAtomicType(T); 4813} 4814