SemaType.cpp revision 4cf4a5e96ab0babd13774b17112e7c1d83042ea7
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 bool isProcessingDeclSpec() const { 154 return chunkIndex == declarator.getNumTypeObjects(); 155 } 156 157 unsigned getCurrentChunkIndex() const { 158 return chunkIndex; 159 } 160 161 void setCurrentChunkIndex(unsigned idx) { 162 assert(idx <= declarator.getNumTypeObjects()); 163 chunkIndex = idx; 164 } 165 166 AttributeList *&getCurrentAttrListRef() const { 167 if (isProcessingDeclSpec()) 168 return getMutableDeclSpec().getAttributes().getListRef(); 169 return declarator.getTypeObject(chunkIndex).getAttrListRef(); 170 } 171 172 /// Save the current set of attributes on the DeclSpec. 173 void saveDeclSpecAttrs() { 174 // Don't try to save them multiple times. 175 if (hasSavedAttrs) return; 176 177 DeclSpec &spec = getMutableDeclSpec(); 178 for (AttributeList *attr = spec.getAttributes().getList(); attr; 179 attr = attr->getNext()) 180 savedAttrs.push_back(attr); 181 trivial &= savedAttrs.empty(); 182 hasSavedAttrs = true; 183 } 184 185 /// Record that we had nowhere to put the given type attribute. 186 /// We will diagnose such attributes later. 187 void addIgnoredTypeAttr(AttributeList &attr) { 188 ignoredTypeAttrs.push_back(&attr); 189 } 190 191 /// Diagnose all the ignored type attributes, given that the 192 /// declarator worked out to the given type. 193 void diagnoseIgnoredTypeAttrs(QualType type) const { 194 for (SmallVectorImpl<AttributeList*>::const_iterator 195 i = ignoredTypeAttrs.begin(), e = ignoredTypeAttrs.end(); 196 i != e; ++i) 197 diagnoseBadTypeAttribute(getSema(), **i, type); 198 } 199 200 ~TypeProcessingState() { 201 if (trivial) return; 202 203 restoreDeclSpecAttrs(); 204 } 205 206 private: 207 DeclSpec &getMutableDeclSpec() const { 208 return const_cast<DeclSpec&>(declarator.getDeclSpec()); 209 } 210 211 void restoreDeclSpecAttrs() { 212 assert(hasSavedAttrs); 213 214 if (savedAttrs.empty()) { 215 getMutableDeclSpec().getAttributes().set(0); 216 return; 217 } 218 219 getMutableDeclSpec().getAttributes().set(savedAttrs[0]); 220 for (unsigned i = 0, e = savedAttrs.size() - 1; i != e; ++i) 221 savedAttrs[i]->setNext(savedAttrs[i+1]); 222 savedAttrs.back()->setNext(0); 223 } 224 }; 225 226 /// Basically std::pair except that we really want to avoid an 227 /// implicit operator= for safety concerns. It's also a minor 228 /// link-time optimization for this to be a private type. 229 struct AttrAndList { 230 /// The attribute. 231 AttributeList &first; 232 233 /// The head of the list the attribute is currently in. 234 AttributeList *&second; 235 236 AttrAndList(AttributeList &attr, AttributeList *&head) 237 : first(attr), second(head) {} 238 }; 239} 240 241namespace llvm { 242 template <> struct isPodLike<AttrAndList> { 243 static const bool value = true; 244 }; 245} 246 247static void spliceAttrIntoList(AttributeList &attr, AttributeList *&head) { 248 attr.setNext(head); 249 head = &attr; 250} 251 252static void spliceAttrOutOfList(AttributeList &attr, AttributeList *&head) { 253 if (head == &attr) { 254 head = attr.getNext(); 255 return; 256 } 257 258 AttributeList *cur = head; 259 while (true) { 260 assert(cur && cur->getNext() && "ran out of attrs?"); 261 if (cur->getNext() == &attr) { 262 cur->setNext(attr.getNext()); 263 return; 264 } 265 cur = cur->getNext(); 266 } 267} 268 269static void moveAttrFromListToList(AttributeList &attr, 270 AttributeList *&fromList, 271 AttributeList *&toList) { 272 spliceAttrOutOfList(attr, fromList); 273 spliceAttrIntoList(attr, toList); 274} 275 276/// The location of a type attribute. 277enum TypeAttrLocation { 278 /// The attribute is in the decl-specifier-seq. 279 TAL_DeclSpec, 280 /// The attribute is part of a DeclaratorChunk. 281 TAL_DeclChunk, 282 /// The attribute is immediately after the declaration's name. 283 TAL_DeclName 284}; 285 286static void processTypeAttrs(TypeProcessingState &state, 287 QualType &type, TypeAttrLocation TAL, 288 AttributeList *attrs); 289 290static bool handleFunctionTypeAttr(TypeProcessingState &state, 291 AttributeList &attr, 292 QualType &type); 293 294static bool handleObjCGCTypeAttr(TypeProcessingState &state, 295 AttributeList &attr, QualType &type); 296 297static bool handleObjCOwnershipTypeAttr(TypeProcessingState &state, 298 AttributeList &attr, QualType &type); 299 300static bool handleObjCPointerTypeAttr(TypeProcessingState &state, 301 AttributeList &attr, QualType &type) { 302 if (attr.getKind() == AttributeList::AT_ObjCGC) 303 return handleObjCGCTypeAttr(state, attr, type); 304 assert(attr.getKind() == AttributeList::AT_ObjCOwnership); 305 return handleObjCOwnershipTypeAttr(state, attr, type); 306} 307 308/// Given the index of a declarator chunk, check whether that chunk 309/// directly specifies the return type of a function and, if so, find 310/// an appropriate place for it. 311/// 312/// \param i - a notional index which the search will start 313/// immediately inside 314static DeclaratorChunk *maybeMovePastReturnType(Declarator &declarator, 315 unsigned i) { 316 assert(i <= declarator.getNumTypeObjects()); 317 318 DeclaratorChunk *result = 0; 319 320 // First, look inwards past parens for a function declarator. 321 for (; i != 0; --i) { 322 DeclaratorChunk &fnChunk = declarator.getTypeObject(i-1); 323 switch (fnChunk.Kind) { 324 case DeclaratorChunk::Paren: 325 continue; 326 327 // If we find anything except a function, bail out. 328 case DeclaratorChunk::Pointer: 329 case DeclaratorChunk::BlockPointer: 330 case DeclaratorChunk::Array: 331 case DeclaratorChunk::Reference: 332 case DeclaratorChunk::MemberPointer: 333 return result; 334 335 // If we do find a function declarator, scan inwards from that, 336 // looking for a block-pointer declarator. 337 case DeclaratorChunk::Function: 338 for (--i; i != 0; --i) { 339 DeclaratorChunk &blockChunk = declarator.getTypeObject(i-1); 340 switch (blockChunk.Kind) { 341 case DeclaratorChunk::Paren: 342 case DeclaratorChunk::Pointer: 343 case DeclaratorChunk::Array: 344 case DeclaratorChunk::Function: 345 case DeclaratorChunk::Reference: 346 case DeclaratorChunk::MemberPointer: 347 continue; 348 case DeclaratorChunk::BlockPointer: 349 result = &blockChunk; 350 goto continue_outer; 351 } 352 llvm_unreachable("bad declarator chunk kind"); 353 } 354 355 // If we run out of declarators doing that, we're done. 356 return result; 357 } 358 llvm_unreachable("bad declarator chunk kind"); 359 360 // Okay, reconsider from our new point. 361 continue_outer: ; 362 } 363 364 // Ran out of chunks, bail out. 365 return result; 366} 367 368/// Given that an objc_gc attribute was written somewhere on a 369/// declaration *other* than on the declarator itself (for which, use 370/// distributeObjCPointerTypeAttrFromDeclarator), and given that it 371/// didn't apply in whatever position it was written in, try to move 372/// it to a more appropriate position. 373static void distributeObjCPointerTypeAttr(TypeProcessingState &state, 374 AttributeList &attr, 375 QualType type) { 376 Declarator &declarator = state.getDeclarator(); 377 378 // Move it to the outermost normal or block pointer declarator. 379 for (unsigned i = state.getCurrentChunkIndex(); i != 0; --i) { 380 DeclaratorChunk &chunk = declarator.getTypeObject(i-1); 381 switch (chunk.Kind) { 382 case DeclaratorChunk::Pointer: 383 case DeclaratorChunk::BlockPointer: { 384 // But don't move an ARC ownership attribute to the return type 385 // of a block. 386 DeclaratorChunk *destChunk = 0; 387 if (state.isProcessingDeclSpec() && 388 attr.getKind() == AttributeList::AT_ObjCOwnership) 389 destChunk = maybeMovePastReturnType(declarator, i - 1); 390 if (!destChunk) destChunk = &chunk; 391 392 moveAttrFromListToList(attr, state.getCurrentAttrListRef(), 393 destChunk->getAttrListRef()); 394 return; 395 } 396 397 case DeclaratorChunk::Paren: 398 case DeclaratorChunk::Array: 399 continue; 400 401 // We may be starting at the return type of a block. 402 case DeclaratorChunk::Function: 403 if (state.isProcessingDeclSpec() && 404 attr.getKind() == AttributeList::AT_ObjCOwnership) { 405 if (DeclaratorChunk *dest = maybeMovePastReturnType(declarator, i)) { 406 moveAttrFromListToList(attr, state.getCurrentAttrListRef(), 407 dest->getAttrListRef()); 408 return; 409 } 410 } 411 goto error; 412 413 // Don't walk through these. 414 case DeclaratorChunk::Reference: 415 case DeclaratorChunk::MemberPointer: 416 goto error; 417 } 418 } 419 error: 420 421 diagnoseBadTypeAttribute(state.getSema(), attr, type); 422} 423 424/// Distribute an objc_gc type attribute that was written on the 425/// declarator. 426static void 427distributeObjCPointerTypeAttrFromDeclarator(TypeProcessingState &state, 428 AttributeList &attr, 429 QualType &declSpecType) { 430 Declarator &declarator = state.getDeclarator(); 431 432 // objc_gc goes on the innermost pointer to something that's not a 433 // pointer. 434 unsigned innermost = -1U; 435 bool considerDeclSpec = true; 436 for (unsigned i = 0, e = declarator.getNumTypeObjects(); i != e; ++i) { 437 DeclaratorChunk &chunk = declarator.getTypeObject(i); 438 switch (chunk.Kind) { 439 case DeclaratorChunk::Pointer: 440 case DeclaratorChunk::BlockPointer: 441 innermost = i; 442 continue; 443 444 case DeclaratorChunk::Reference: 445 case DeclaratorChunk::MemberPointer: 446 case DeclaratorChunk::Paren: 447 case DeclaratorChunk::Array: 448 continue; 449 450 case DeclaratorChunk::Function: 451 considerDeclSpec = false; 452 goto done; 453 } 454 } 455 done: 456 457 // That might actually be the decl spec if we weren't blocked by 458 // anything in the declarator. 459 if (considerDeclSpec) { 460 if (handleObjCPointerTypeAttr(state, attr, declSpecType)) { 461 // Splice the attribute into the decl spec. Prevents the 462 // attribute from being applied multiple times and gives 463 // the source-location-filler something to work with. 464 state.saveDeclSpecAttrs(); 465 moveAttrFromListToList(attr, declarator.getAttrListRef(), 466 declarator.getMutableDeclSpec().getAttributes().getListRef()); 467 return; 468 } 469 } 470 471 // Otherwise, if we found an appropriate chunk, splice the attribute 472 // into it. 473 if (innermost != -1U) { 474 moveAttrFromListToList(attr, declarator.getAttrListRef(), 475 declarator.getTypeObject(innermost).getAttrListRef()); 476 return; 477 } 478 479 // Otherwise, diagnose when we're done building the type. 480 spliceAttrOutOfList(attr, declarator.getAttrListRef()); 481 state.addIgnoredTypeAttr(attr); 482} 483 484/// A function type attribute was written somewhere in a declaration 485/// *other* than on the declarator itself or in the decl spec. Given 486/// that it didn't apply in whatever position it was written in, try 487/// to move it to a more appropriate position. 488static void distributeFunctionTypeAttr(TypeProcessingState &state, 489 AttributeList &attr, 490 QualType type) { 491 Declarator &declarator = state.getDeclarator(); 492 493 // Try to push the attribute from the return type of a function to 494 // the function itself. 495 for (unsigned i = state.getCurrentChunkIndex(); i != 0; --i) { 496 DeclaratorChunk &chunk = declarator.getTypeObject(i-1); 497 switch (chunk.Kind) { 498 case DeclaratorChunk::Function: 499 moveAttrFromListToList(attr, state.getCurrentAttrListRef(), 500 chunk.getAttrListRef()); 501 return; 502 503 case DeclaratorChunk::Paren: 504 case DeclaratorChunk::Pointer: 505 case DeclaratorChunk::BlockPointer: 506 case DeclaratorChunk::Array: 507 case DeclaratorChunk::Reference: 508 case DeclaratorChunk::MemberPointer: 509 continue; 510 } 511 } 512 513 diagnoseBadTypeAttribute(state.getSema(), attr, type); 514} 515 516/// Try to distribute a function type attribute to the innermost 517/// function chunk or type. Returns true if the attribute was 518/// distributed, false if no location was found. 519static bool 520distributeFunctionTypeAttrToInnermost(TypeProcessingState &state, 521 AttributeList &attr, 522 AttributeList *&attrList, 523 QualType &declSpecType) { 524 Declarator &declarator = state.getDeclarator(); 525 526 // Put it on the innermost function chunk, if there is one. 527 for (unsigned i = 0, e = declarator.getNumTypeObjects(); i != e; ++i) { 528 DeclaratorChunk &chunk = declarator.getTypeObject(i); 529 if (chunk.Kind != DeclaratorChunk::Function) continue; 530 531 moveAttrFromListToList(attr, attrList, chunk.getAttrListRef()); 532 return true; 533 } 534 535 if (handleFunctionTypeAttr(state, attr, declSpecType)) { 536 spliceAttrOutOfList(attr, attrList); 537 return true; 538 } 539 540 return false; 541} 542 543/// A function type attribute was written in the decl spec. Try to 544/// apply it somewhere. 545static void 546distributeFunctionTypeAttrFromDeclSpec(TypeProcessingState &state, 547 AttributeList &attr, 548 QualType &declSpecType) { 549 state.saveDeclSpecAttrs(); 550 551 // C++11 attributes before the decl specifiers actually appertain to 552 // the declarators. Move them straight there. We don't support the 553 // 'put them wherever you like' semantics we allow for GNU attributes. 554 if (attr.isCXX11Attribute()) { 555 moveAttrFromListToList(attr, state.getCurrentAttrListRef(), 556 state.getDeclarator().getAttrListRef()); 557 return; 558 } 559 560 // Try to distribute to the innermost. 561 if (distributeFunctionTypeAttrToInnermost(state, attr, 562 state.getCurrentAttrListRef(), 563 declSpecType)) 564 return; 565 566 // If that failed, diagnose the bad attribute when the declarator is 567 // fully built. 568 state.addIgnoredTypeAttr(attr); 569} 570 571/// A function type attribute was written on the declarator. Try to 572/// apply it somewhere. 573static void 574distributeFunctionTypeAttrFromDeclarator(TypeProcessingState &state, 575 AttributeList &attr, 576 QualType &declSpecType) { 577 Declarator &declarator = state.getDeclarator(); 578 579 // Try to distribute to the innermost. 580 if (distributeFunctionTypeAttrToInnermost(state, attr, 581 declarator.getAttrListRef(), 582 declSpecType)) 583 return; 584 585 // If that failed, diagnose the bad attribute when the declarator is 586 // fully built. 587 spliceAttrOutOfList(attr, declarator.getAttrListRef()); 588 state.addIgnoredTypeAttr(attr); 589} 590 591/// \brief Given that there are attributes written on the declarator 592/// itself, try to distribute any type attributes to the appropriate 593/// declarator chunk. 594/// 595/// These are attributes like the following: 596/// int f ATTR; 597/// int (f ATTR)(); 598/// but not necessarily this: 599/// int f() ATTR; 600static void distributeTypeAttrsFromDeclarator(TypeProcessingState &state, 601 QualType &declSpecType) { 602 // Collect all the type attributes from the declarator itself. 603 assert(state.getDeclarator().getAttributes() && "declarator has no attrs!"); 604 AttributeList *attr = state.getDeclarator().getAttributes(); 605 AttributeList *next; 606 do { 607 next = attr->getNext(); 608 609 // Do not distribute C++11 attributes. They have strict rules for what 610 // they appertain to. 611 if (attr->isCXX11Attribute()) 612 continue; 613 614 switch (attr->getKind()) { 615 OBJC_POINTER_TYPE_ATTRS_CASELIST: 616 distributeObjCPointerTypeAttrFromDeclarator(state, *attr, declSpecType); 617 break; 618 619 case AttributeList::AT_NSReturnsRetained: 620 if (!state.getSema().getLangOpts().ObjCAutoRefCount) 621 break; 622 // fallthrough 623 624 FUNCTION_TYPE_ATTRS_CASELIST: 625 distributeFunctionTypeAttrFromDeclarator(state, *attr, declSpecType); 626 break; 627 628 default: 629 break; 630 } 631 } while ((attr = next)); 632} 633 634/// Add a synthetic '()' to a block-literal declarator if it is 635/// required, given the return type. 636static void maybeSynthesizeBlockSignature(TypeProcessingState &state, 637 QualType declSpecType) { 638 Declarator &declarator = state.getDeclarator(); 639 640 // First, check whether the declarator would produce a function, 641 // i.e. whether the innermost semantic chunk is a function. 642 if (declarator.isFunctionDeclarator()) { 643 // If so, make that declarator a prototyped declarator. 644 declarator.getFunctionTypeInfo().hasPrototype = true; 645 return; 646 } 647 648 // If there are any type objects, the type as written won't name a 649 // function, regardless of the decl spec type. This is because a 650 // block signature declarator is always an abstract-declarator, and 651 // abstract-declarators can't just be parentheses chunks. Therefore 652 // we need to build a function chunk unless there are no type 653 // objects and the decl spec type is a function. 654 if (!declarator.getNumTypeObjects() && declSpecType->isFunctionType()) 655 return; 656 657 // Note that there *are* cases with invalid declarators where 658 // declarators consist solely of parentheses. In general, these 659 // occur only in failed efforts to make function declarators, so 660 // faking up the function chunk is still the right thing to do. 661 662 // Otherwise, we need to fake up a function declarator. 663 SourceLocation loc = declarator.getLocStart(); 664 665 // ...and *prepend* it to the declarator. 666 SourceLocation NoLoc; 667 declarator.AddInnermostTypeInfo(DeclaratorChunk::getFunction( 668 /*HasProto=*/true, 669 /*IsAmbiguous=*/false, 670 /*LParenLoc=*/NoLoc, 671 /*ArgInfo=*/0, 672 /*NumArgs=*/0, 673 /*EllipsisLoc=*/NoLoc, 674 /*RParenLoc=*/NoLoc, 675 /*TypeQuals=*/0, 676 /*RefQualifierIsLvalueRef=*/true, 677 /*RefQualifierLoc=*/NoLoc, 678 /*ConstQualifierLoc=*/NoLoc, 679 /*VolatileQualifierLoc=*/NoLoc, 680 /*MutableLoc=*/NoLoc, 681 EST_None, 682 /*ESpecLoc=*/NoLoc, 683 /*Exceptions=*/0, 684 /*ExceptionRanges=*/0, 685 /*NumExceptions=*/0, 686 /*NoexceptExpr=*/0, 687 loc, loc, declarator)); 688 689 // For consistency, make sure the state still has us as processing 690 // the decl spec. 691 assert(state.getCurrentChunkIndex() == declarator.getNumTypeObjects() - 1); 692 state.setCurrentChunkIndex(declarator.getNumTypeObjects()); 693} 694 695/// \brief Convert the specified declspec to the appropriate type 696/// object. 697/// \param state Specifies the declarator containing the declaration specifier 698/// to be converted, along with other associated processing state. 699/// \returns The type described by the declaration specifiers. This function 700/// never returns null. 701static QualType ConvertDeclSpecToType(TypeProcessingState &state) { 702 // FIXME: Should move the logic from DeclSpec::Finish to here for validity 703 // checking. 704 705 Sema &S = state.getSema(); 706 Declarator &declarator = state.getDeclarator(); 707 const DeclSpec &DS = declarator.getDeclSpec(); 708 SourceLocation DeclLoc = declarator.getIdentifierLoc(); 709 if (DeclLoc.isInvalid()) 710 DeclLoc = DS.getLocStart(); 711 712 ASTContext &Context = S.Context; 713 714 QualType Result; 715 switch (DS.getTypeSpecType()) { 716 case DeclSpec::TST_void: 717 Result = Context.VoidTy; 718 break; 719 case DeclSpec::TST_char: 720 if (DS.getTypeSpecSign() == DeclSpec::TSS_unspecified) 721 Result = Context.CharTy; 722 else if (DS.getTypeSpecSign() == DeclSpec::TSS_signed) 723 Result = Context.SignedCharTy; 724 else { 725 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unsigned && 726 "Unknown TSS value"); 727 Result = Context.UnsignedCharTy; 728 } 729 break; 730 case DeclSpec::TST_wchar: 731 if (DS.getTypeSpecSign() == DeclSpec::TSS_unspecified) 732 Result = Context.WCharTy; 733 else if (DS.getTypeSpecSign() == DeclSpec::TSS_signed) { 734 S.Diag(DS.getTypeSpecSignLoc(), diag::ext_invalid_sign_spec) 735 << DS.getSpecifierName(DS.getTypeSpecType()); 736 Result = Context.getSignedWCharType(); 737 } else { 738 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unsigned && 739 "Unknown TSS value"); 740 S.Diag(DS.getTypeSpecSignLoc(), diag::ext_invalid_sign_spec) 741 << DS.getSpecifierName(DS.getTypeSpecType()); 742 Result = Context.getUnsignedWCharType(); 743 } 744 break; 745 case DeclSpec::TST_char16: 746 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unspecified && 747 "Unknown TSS value"); 748 Result = Context.Char16Ty; 749 break; 750 case DeclSpec::TST_char32: 751 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unspecified && 752 "Unknown TSS value"); 753 Result = Context.Char32Ty; 754 break; 755 case DeclSpec::TST_unspecified: 756 // "<proto1,proto2>" is an objc qualified ID with a missing id. 757 if (DeclSpec::ProtocolQualifierListTy PQ = DS.getProtocolQualifiers()) { 758 Result = Context.getObjCObjectType(Context.ObjCBuiltinIdTy, 759 (ObjCProtocolDecl*const*)PQ, 760 DS.getNumProtocolQualifiers()); 761 Result = Context.getObjCObjectPointerType(Result); 762 break; 763 } 764 765 // If this is a missing declspec in a block literal return context, then it 766 // is inferred from the return statements inside the block. 767 // The declspec is always missing in a lambda expr context; it is either 768 // specified with a trailing return type or inferred. 769 if (declarator.getContext() == Declarator::LambdaExprContext || 770 isOmittedBlockReturnType(declarator)) { 771 Result = Context.DependentTy; 772 break; 773 } 774 775 // Unspecified typespec defaults to int in C90. However, the C90 grammar 776 // [C90 6.5] only allows a decl-spec if there was *some* type-specifier, 777 // type-qualifier, or storage-class-specifier. If not, emit an extwarn. 778 // Note that the one exception to this is function definitions, which are 779 // allowed to be completely missing a declspec. This is handled in the 780 // parser already though by it pretending to have seen an 'int' in this 781 // case. 782 if (S.getLangOpts().ImplicitInt) { 783 // In C89 mode, we only warn if there is a completely missing declspec 784 // when one is not allowed. 785 if (DS.isEmpty()) { 786 S.Diag(DeclLoc, diag::ext_missing_declspec) 787 << DS.getSourceRange() 788 << FixItHint::CreateInsertion(DS.getLocStart(), "int"); 789 } 790 } else if (!DS.hasTypeSpecifier()) { 791 // C99 and C++ require a type specifier. For example, C99 6.7.2p2 says: 792 // "At least one type specifier shall be given in the declaration 793 // specifiers in each declaration, and in the specifier-qualifier list in 794 // each struct declaration and type name." 795 // FIXME: Does Microsoft really have the implicit int extension in C++? 796 if (S.getLangOpts().CPlusPlus && 797 !S.getLangOpts().MicrosoftExt) { 798 S.Diag(DeclLoc, diag::err_missing_type_specifier) 799 << DS.getSourceRange(); 800 801 // When this occurs in C++ code, often something is very broken with the 802 // value being declared, poison it as invalid so we don't get chains of 803 // errors. 804 declarator.setInvalidType(true); 805 } else { 806 S.Diag(DeclLoc, diag::ext_missing_type_specifier) 807 << DS.getSourceRange(); 808 } 809 } 810 811 // FALL THROUGH. 812 case DeclSpec::TST_int: { 813 if (DS.getTypeSpecSign() != DeclSpec::TSS_unsigned) { 814 switch (DS.getTypeSpecWidth()) { 815 case DeclSpec::TSW_unspecified: Result = Context.IntTy; break; 816 case DeclSpec::TSW_short: Result = Context.ShortTy; break; 817 case DeclSpec::TSW_long: Result = Context.LongTy; break; 818 case DeclSpec::TSW_longlong: 819 Result = Context.LongLongTy; 820 821 // 'long long' is a C99 or C++11 feature. 822 if (!S.getLangOpts().C99) { 823 if (S.getLangOpts().CPlusPlus) 824 S.Diag(DS.getTypeSpecWidthLoc(), 825 S.getLangOpts().CPlusPlus11 ? 826 diag::warn_cxx98_compat_longlong : diag::ext_cxx11_longlong); 827 else 828 S.Diag(DS.getTypeSpecWidthLoc(), diag::ext_c99_longlong); 829 } 830 break; 831 } 832 } else { 833 switch (DS.getTypeSpecWidth()) { 834 case DeclSpec::TSW_unspecified: Result = Context.UnsignedIntTy; break; 835 case DeclSpec::TSW_short: Result = Context.UnsignedShortTy; break; 836 case DeclSpec::TSW_long: Result = Context.UnsignedLongTy; break; 837 case DeclSpec::TSW_longlong: 838 Result = Context.UnsignedLongLongTy; 839 840 // 'long long' is a C99 or C++11 feature. 841 if (!S.getLangOpts().C99) { 842 if (S.getLangOpts().CPlusPlus) 843 S.Diag(DS.getTypeSpecWidthLoc(), 844 S.getLangOpts().CPlusPlus11 ? 845 diag::warn_cxx98_compat_longlong : diag::ext_cxx11_longlong); 846 else 847 S.Diag(DS.getTypeSpecWidthLoc(), diag::ext_c99_longlong); 848 } 849 break; 850 } 851 } 852 break; 853 } 854 case DeclSpec::TST_int128: 855 if (!S.PP.getTargetInfo().hasInt128Type()) 856 S.Diag(DS.getTypeSpecTypeLoc(), diag::err_int128_unsupported); 857 if (DS.getTypeSpecSign() == DeclSpec::TSS_unsigned) 858 Result = Context.UnsignedInt128Ty; 859 else 860 Result = Context.Int128Ty; 861 break; 862 case DeclSpec::TST_half: Result = Context.HalfTy; break; 863 case DeclSpec::TST_float: Result = Context.FloatTy; break; 864 case DeclSpec::TST_double: 865 if (DS.getTypeSpecWidth() == DeclSpec::TSW_long) 866 Result = Context.LongDoubleTy; 867 else 868 Result = Context.DoubleTy; 869 870 if (S.getLangOpts().OpenCL && !S.getOpenCLOptions().cl_khr_fp64) { 871 S.Diag(DS.getTypeSpecTypeLoc(), diag::err_double_requires_fp64); 872 declarator.setInvalidType(true); 873 } 874 break; 875 case DeclSpec::TST_bool: Result = Context.BoolTy; break; // _Bool or bool 876 case DeclSpec::TST_decimal32: // _Decimal32 877 case DeclSpec::TST_decimal64: // _Decimal64 878 case DeclSpec::TST_decimal128: // _Decimal128 879 S.Diag(DS.getTypeSpecTypeLoc(), diag::err_decimal_unsupported); 880 Result = Context.IntTy; 881 declarator.setInvalidType(true); 882 break; 883 case DeclSpec::TST_class: 884 case DeclSpec::TST_enum: 885 case DeclSpec::TST_union: 886 case DeclSpec::TST_struct: 887 case DeclSpec::TST_interface: { 888 TypeDecl *D = dyn_cast_or_null<TypeDecl>(DS.getRepAsDecl()); 889 if (!D) { 890 // This can happen in C++ with ambiguous lookups. 891 Result = Context.IntTy; 892 declarator.setInvalidType(true); 893 break; 894 } 895 896 // If the type is deprecated or unavailable, diagnose it. 897 S.DiagnoseUseOfDecl(D, DS.getTypeSpecTypeNameLoc()); 898 899 assert(DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 && 900 DS.getTypeSpecSign() == 0 && "No qualifiers on tag names!"); 901 902 // TypeQuals handled by caller. 903 Result = Context.getTypeDeclType(D); 904 905 // In both C and C++, make an ElaboratedType. 906 ElaboratedTypeKeyword Keyword 907 = ElaboratedType::getKeywordForTypeSpec(DS.getTypeSpecType()); 908 Result = S.getElaboratedType(Keyword, DS.getTypeSpecScope(), Result); 909 break; 910 } 911 case DeclSpec::TST_typename: { 912 assert(DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 && 913 DS.getTypeSpecSign() == 0 && 914 "Can't handle qualifiers on typedef names yet!"); 915 Result = S.GetTypeFromParser(DS.getRepAsType()); 916 if (Result.isNull()) 917 declarator.setInvalidType(true); 918 else if (DeclSpec::ProtocolQualifierListTy PQ 919 = DS.getProtocolQualifiers()) { 920 if (const ObjCObjectType *ObjT = Result->getAs<ObjCObjectType>()) { 921 // Silently drop any existing protocol qualifiers. 922 // TODO: determine whether that's the right thing to do. 923 if (ObjT->getNumProtocols()) 924 Result = ObjT->getBaseType(); 925 926 if (DS.getNumProtocolQualifiers()) 927 Result = Context.getObjCObjectType(Result, 928 (ObjCProtocolDecl*const*) PQ, 929 DS.getNumProtocolQualifiers()); 930 } else if (Result->isObjCIdType()) { 931 // id<protocol-list> 932 Result = Context.getObjCObjectType(Context.ObjCBuiltinIdTy, 933 (ObjCProtocolDecl*const*) PQ, 934 DS.getNumProtocolQualifiers()); 935 Result = Context.getObjCObjectPointerType(Result); 936 } else if (Result->isObjCClassType()) { 937 // Class<protocol-list> 938 Result = Context.getObjCObjectType(Context.ObjCBuiltinClassTy, 939 (ObjCProtocolDecl*const*) PQ, 940 DS.getNumProtocolQualifiers()); 941 Result = Context.getObjCObjectPointerType(Result); 942 } else { 943 S.Diag(DeclLoc, diag::err_invalid_protocol_qualifiers) 944 << DS.getSourceRange(); 945 declarator.setInvalidType(true); 946 } 947 } 948 949 // TypeQuals handled by caller. 950 break; 951 } 952 case DeclSpec::TST_typeofType: 953 // FIXME: Preserve type source info. 954 Result = S.GetTypeFromParser(DS.getRepAsType()); 955 assert(!Result.isNull() && "Didn't get a type for typeof?"); 956 if (!Result->isDependentType()) 957 if (const TagType *TT = Result->getAs<TagType>()) 958 S.DiagnoseUseOfDecl(TT->getDecl(), DS.getTypeSpecTypeLoc()); 959 // TypeQuals handled by caller. 960 Result = Context.getTypeOfType(Result); 961 break; 962 case DeclSpec::TST_typeofExpr: { 963 Expr *E = DS.getRepAsExpr(); 964 assert(E && "Didn't get an expression for typeof?"); 965 // TypeQuals handled by caller. 966 Result = S.BuildTypeofExprType(E, DS.getTypeSpecTypeLoc()); 967 if (Result.isNull()) { 968 Result = Context.IntTy; 969 declarator.setInvalidType(true); 970 } 971 break; 972 } 973 case DeclSpec::TST_decltype: { 974 Expr *E = DS.getRepAsExpr(); 975 assert(E && "Didn't get an expression for decltype?"); 976 // TypeQuals handled by caller. 977 Result = S.BuildDecltypeType(E, DS.getTypeSpecTypeLoc()); 978 if (Result.isNull()) { 979 Result = Context.IntTy; 980 declarator.setInvalidType(true); 981 } 982 break; 983 } 984 case DeclSpec::TST_underlyingType: 985 Result = S.GetTypeFromParser(DS.getRepAsType()); 986 assert(!Result.isNull() && "Didn't get a type for __underlying_type?"); 987 Result = S.BuildUnaryTransformType(Result, 988 UnaryTransformType::EnumUnderlyingType, 989 DS.getTypeSpecTypeLoc()); 990 if (Result.isNull()) { 991 Result = Context.IntTy; 992 declarator.setInvalidType(true); 993 } 994 break; 995 996 case DeclSpec::TST_auto: { 997 // TypeQuals handled by caller. 998 Result = Context.getAutoType(QualType()); 999 break; 1000 } 1001 1002 case DeclSpec::TST_unknown_anytype: 1003 Result = Context.UnknownAnyTy; 1004 break; 1005 1006 case DeclSpec::TST_atomic: 1007 Result = S.GetTypeFromParser(DS.getRepAsType()); 1008 assert(!Result.isNull() && "Didn't get a type for _Atomic?"); 1009 Result = S.BuildAtomicType(Result, DS.getTypeSpecTypeLoc()); 1010 if (Result.isNull()) { 1011 Result = Context.IntTy; 1012 declarator.setInvalidType(true); 1013 } 1014 break; 1015 1016 case DeclSpec::TST_image1d_t: 1017 Result = Context.OCLImage1dTy; 1018 break; 1019 1020 case DeclSpec::TST_image1d_array_t: 1021 Result = Context.OCLImage1dArrayTy; 1022 break; 1023 1024 case DeclSpec::TST_image1d_buffer_t: 1025 Result = Context.OCLImage1dBufferTy; 1026 break; 1027 1028 case DeclSpec::TST_image2d_t: 1029 Result = Context.OCLImage2dTy; 1030 break; 1031 1032 case DeclSpec::TST_image2d_array_t: 1033 Result = Context.OCLImage2dArrayTy; 1034 break; 1035 1036 case DeclSpec::TST_image3d_t: 1037 Result = Context.OCLImage3dTy; 1038 break; 1039 1040 case DeclSpec::TST_sampler_t: 1041 Result = Context.OCLSamplerTy; 1042 break; 1043 1044 case DeclSpec::TST_event_t: 1045 Result = Context.OCLEventTy; 1046 break; 1047 1048 case DeclSpec::TST_error: 1049 Result = Context.IntTy; 1050 declarator.setInvalidType(true); 1051 break; 1052 } 1053 1054 // Handle complex types. 1055 if (DS.getTypeSpecComplex() == DeclSpec::TSC_complex) { 1056 if (S.getLangOpts().Freestanding) 1057 S.Diag(DS.getTypeSpecComplexLoc(), diag::ext_freestanding_complex); 1058 Result = Context.getComplexType(Result); 1059 } else if (DS.isTypeAltiVecVector()) { 1060 unsigned typeSize = static_cast<unsigned>(Context.getTypeSize(Result)); 1061 assert(typeSize > 0 && "type size for vector must be greater than 0 bits"); 1062 VectorType::VectorKind VecKind = VectorType::AltiVecVector; 1063 if (DS.isTypeAltiVecPixel()) 1064 VecKind = VectorType::AltiVecPixel; 1065 else if (DS.isTypeAltiVecBool()) 1066 VecKind = VectorType::AltiVecBool; 1067 Result = Context.getVectorType(Result, 128/typeSize, VecKind); 1068 } 1069 1070 // FIXME: Imaginary. 1071 if (DS.getTypeSpecComplex() == DeclSpec::TSC_imaginary) 1072 S.Diag(DS.getTypeSpecComplexLoc(), diag::err_imaginary_not_supported); 1073 1074 // Before we process any type attributes, synthesize a block literal 1075 // function declarator if necessary. 1076 if (declarator.getContext() == Declarator::BlockLiteralContext) 1077 maybeSynthesizeBlockSignature(state, Result); 1078 1079 // Apply any type attributes from the decl spec. This may cause the 1080 // list of type attributes to be temporarily saved while the type 1081 // attributes are pushed around. 1082 if (AttributeList *attrs = DS.getAttributes().getList()) 1083 processTypeAttrs(state, Result, TAL_DeclSpec, attrs); 1084 1085 // Apply const/volatile/restrict qualifiers to T. 1086 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 1087 1088 // Warn about CV qualifiers on functions: C99 6.7.3p8: "If the specification 1089 // of a function type includes any type qualifiers, the behavior is 1090 // undefined." 1091 if (Result->isFunctionType() && TypeQuals) { 1092 if (TypeQuals & DeclSpec::TQ_const) 1093 S.Diag(DS.getConstSpecLoc(), diag::warn_typecheck_function_qualifiers) 1094 << Result << DS.getSourceRange(); 1095 else if (TypeQuals & DeclSpec::TQ_volatile) 1096 S.Diag(DS.getVolatileSpecLoc(), diag::warn_typecheck_function_qualifiers) 1097 << Result << DS.getSourceRange(); 1098 else { 1099 assert((TypeQuals & (DeclSpec::TQ_restrict | DeclSpec::TQ_atomic)) && 1100 "Has CVRA quals but not C, V, R, or A?"); 1101 // No diagnostic; we'll diagnose 'restrict' or '_Atomic' applied to a 1102 // function type later, in BuildQualifiedType. 1103 } 1104 } 1105 1106 // C++ [dcl.ref]p1: 1107 // Cv-qualified references are ill-formed except when the 1108 // cv-qualifiers are introduced through the use of a typedef 1109 // (7.1.3) or of a template type argument (14.3), in which 1110 // case the cv-qualifiers are ignored. 1111 // FIXME: Shouldn't we be checking SCS_typedef here? 1112 if (DS.getTypeSpecType() == DeclSpec::TST_typename && 1113 TypeQuals && Result->isReferenceType()) { 1114 TypeQuals &= ~DeclSpec::TQ_const; 1115 TypeQuals &= ~DeclSpec::TQ_volatile; 1116 TypeQuals &= ~DeclSpec::TQ_atomic; 1117 } 1118 1119 // C90 6.5.3 constraints: "The same type qualifier shall not appear more 1120 // than once in the same specifier-list or qualifier-list, either directly 1121 // or via one or more typedefs." 1122 if (!S.getLangOpts().C99 && !S.getLangOpts().CPlusPlus 1123 && TypeQuals & Result.getCVRQualifiers()) { 1124 if (TypeQuals & DeclSpec::TQ_const && Result.isConstQualified()) { 1125 S.Diag(DS.getConstSpecLoc(), diag::ext_duplicate_declspec) 1126 << "const"; 1127 } 1128 1129 if (TypeQuals & DeclSpec::TQ_volatile && Result.isVolatileQualified()) { 1130 S.Diag(DS.getVolatileSpecLoc(), diag::ext_duplicate_declspec) 1131 << "volatile"; 1132 } 1133 1134 // C90 doesn't have restrict nor _Atomic, so it doesn't force us to 1135 // produce a warning in this case. 1136 } 1137 1138 QualType Qualified = S.BuildQualifiedType(Result, DeclLoc, TypeQuals, &DS); 1139 1140 // If adding qualifiers fails, just use the unqualified type. 1141 if (Qualified.isNull()) 1142 declarator.setInvalidType(true); 1143 else 1144 Result = Qualified; 1145 } 1146 1147 return Result; 1148} 1149 1150static std::string getPrintableNameForEntity(DeclarationName Entity) { 1151 if (Entity) 1152 return Entity.getAsString(); 1153 1154 return "type name"; 1155} 1156 1157QualType Sema::BuildQualifiedType(QualType T, SourceLocation Loc, 1158 Qualifiers Qs, const DeclSpec *DS) { 1159 // Enforce C99 6.7.3p2: "Types other than pointer types derived from 1160 // object or incomplete types shall not be restrict-qualified." 1161 if (Qs.hasRestrict()) { 1162 unsigned DiagID = 0; 1163 QualType ProblemTy; 1164 1165 if (T->isAnyPointerType() || T->isReferenceType() || 1166 T->isMemberPointerType()) { 1167 QualType EltTy; 1168 if (T->isObjCObjectPointerType()) 1169 EltTy = T; 1170 else if (const MemberPointerType *PTy = T->getAs<MemberPointerType>()) 1171 EltTy = PTy->getPointeeType(); 1172 else 1173 EltTy = T->getPointeeType(); 1174 1175 // If we have a pointer or reference, the pointee must have an object 1176 // incomplete type. 1177 if (!EltTy->isIncompleteOrObjectType()) { 1178 DiagID = diag::err_typecheck_invalid_restrict_invalid_pointee; 1179 ProblemTy = EltTy; 1180 } 1181 } else if (!T->isDependentType()) { 1182 DiagID = diag::err_typecheck_invalid_restrict_not_pointer; 1183 ProblemTy = T; 1184 } 1185 1186 if (DiagID) { 1187 Diag(DS ? DS->getRestrictSpecLoc() : Loc, DiagID) << ProblemTy; 1188 Qs.removeRestrict(); 1189 } 1190 } 1191 1192 return Context.getQualifiedType(T, Qs); 1193} 1194 1195QualType Sema::BuildQualifiedType(QualType T, SourceLocation Loc, 1196 unsigned CVRA, const DeclSpec *DS) { 1197 // Convert from DeclSpec::TQ to Qualifiers::TQ by just dropping TQ_atomic. 1198 unsigned CVR = CVRA & ~DeclSpec::TQ_atomic; 1199 1200 // C11 6.7.3/5: 1201 // If the same qualifier appears more than once in the same 1202 // specifier-qualifier-list, either directly or via one or more typedefs, 1203 // the behavior is the same as if it appeared only once. 1204 // 1205 // It's not specified what happens when the _Atomic qualifier is applied to 1206 // a type specified with the _Atomic specifier, but we assume that this 1207 // should be treated as if the _Atomic qualifier appeared multiple times. 1208 if (CVRA & DeclSpec::TQ_atomic && !T->isAtomicType()) { 1209 // C11 6.7.3/5: 1210 // If other qualifiers appear along with the _Atomic qualifier in a 1211 // specifier-qualifier-list, the resulting type is the so-qualified 1212 // atomic type. 1213 // 1214 // Don't need to worry about array types here, since _Atomic can't be 1215 // applied to such types. 1216 SplitQualType Split = T.getSplitUnqualifiedType(); 1217 T = BuildAtomicType(QualType(Split.Ty, 0), 1218 DS ? DS->getAtomicSpecLoc() : Loc); 1219 if (T.isNull()) 1220 return T; 1221 Split.Quals.addCVRQualifiers(CVR); 1222 return BuildQualifiedType(T, Loc, Split.Quals); 1223 } 1224 1225 return BuildQualifiedType(T, Loc, Qualifiers::fromCVRMask(CVR), DS); 1226} 1227 1228/// \brief Build a paren type including \p T. 1229QualType Sema::BuildParenType(QualType T) { 1230 return Context.getParenType(T); 1231} 1232 1233/// Given that we're building a pointer or reference to the given 1234static QualType inferARCLifetimeForPointee(Sema &S, QualType type, 1235 SourceLocation loc, 1236 bool isReference) { 1237 // Bail out if retention is unrequired or already specified. 1238 if (!type->isObjCLifetimeType() || 1239 type.getObjCLifetime() != Qualifiers::OCL_None) 1240 return type; 1241 1242 Qualifiers::ObjCLifetime implicitLifetime = Qualifiers::OCL_None; 1243 1244 // If the object type is const-qualified, we can safely use 1245 // __unsafe_unretained. This is safe (because there are no read 1246 // barriers), and it'll be safe to coerce anything but __weak* to 1247 // the resulting type. 1248 if (type.isConstQualified()) { 1249 implicitLifetime = Qualifiers::OCL_ExplicitNone; 1250 1251 // Otherwise, check whether the static type does not require 1252 // retaining. This currently only triggers for Class (possibly 1253 // protocol-qualifed, and arrays thereof). 1254 } else if (type->isObjCARCImplicitlyUnretainedType()) { 1255 implicitLifetime = Qualifiers::OCL_ExplicitNone; 1256 1257 // If we are in an unevaluated context, like sizeof, skip adding a 1258 // qualification. 1259 } else if (S.isUnevaluatedContext()) { 1260 return type; 1261 1262 // If that failed, give an error and recover using __strong. __strong 1263 // is the option most likely to prevent spurious second-order diagnostics, 1264 // like when binding a reference to a field. 1265 } else { 1266 // These types can show up in private ivars in system headers, so 1267 // we need this to not be an error in those cases. Instead we 1268 // want to delay. 1269 if (S.DelayedDiagnostics.shouldDelayDiagnostics()) { 1270 S.DelayedDiagnostics.add( 1271 sema::DelayedDiagnostic::makeForbiddenType(loc, 1272 diag::err_arc_indirect_no_ownership, type, isReference)); 1273 } else { 1274 S.Diag(loc, diag::err_arc_indirect_no_ownership) << type << isReference; 1275 } 1276 implicitLifetime = Qualifiers::OCL_Strong; 1277 } 1278 assert(implicitLifetime && "didn't infer any lifetime!"); 1279 1280 Qualifiers qs; 1281 qs.addObjCLifetime(implicitLifetime); 1282 return S.Context.getQualifiedType(type, qs); 1283} 1284 1285/// \brief Build a pointer type. 1286/// 1287/// \param T The type to which we'll be building a pointer. 1288/// 1289/// \param Loc The location of the entity whose type involves this 1290/// pointer type or, if there is no such entity, the location of the 1291/// type that will have pointer type. 1292/// 1293/// \param Entity The name of the entity that involves the pointer 1294/// type, if known. 1295/// 1296/// \returns A suitable pointer type, if there are no 1297/// errors. Otherwise, returns a NULL type. 1298QualType Sema::BuildPointerType(QualType T, 1299 SourceLocation Loc, DeclarationName Entity) { 1300 if (T->isReferenceType()) { 1301 // C++ 8.3.2p4: There shall be no ... pointers to references ... 1302 Diag(Loc, diag::err_illegal_decl_pointer_to_reference) 1303 << getPrintableNameForEntity(Entity) << T; 1304 return QualType(); 1305 } 1306 1307 assert(!T->isObjCObjectType() && "Should build ObjCObjectPointerType"); 1308 1309 // In ARC, it is forbidden to build pointers to unqualified pointers. 1310 if (getLangOpts().ObjCAutoRefCount) 1311 T = inferARCLifetimeForPointee(*this, T, Loc, /*reference*/ false); 1312 1313 // Build the pointer type. 1314 return Context.getPointerType(T); 1315} 1316 1317/// \brief Build a reference type. 1318/// 1319/// \param T The type to which we'll be building a reference. 1320/// 1321/// \param Loc The location of the entity whose type involves this 1322/// reference type or, if there is no such entity, the location of the 1323/// type that will have reference type. 1324/// 1325/// \param Entity The name of the entity that involves the reference 1326/// type, if known. 1327/// 1328/// \returns A suitable reference type, if there are no 1329/// errors. Otherwise, returns a NULL type. 1330QualType Sema::BuildReferenceType(QualType T, bool SpelledAsLValue, 1331 SourceLocation Loc, 1332 DeclarationName Entity) { 1333 assert(Context.getCanonicalType(T) != Context.OverloadTy && 1334 "Unresolved overloaded function type"); 1335 1336 // C++0x [dcl.ref]p6: 1337 // If a typedef (7.1.3), a type template-parameter (14.3.1), or a 1338 // decltype-specifier (7.1.6.2) denotes a type TR that is a reference to a 1339 // type T, an attempt to create the type "lvalue reference to cv TR" creates 1340 // the type "lvalue reference to T", while an attempt to create the type 1341 // "rvalue reference to cv TR" creates the type TR. 1342 bool LValueRef = SpelledAsLValue || T->getAs<LValueReferenceType>(); 1343 1344 // C++ [dcl.ref]p4: There shall be no references to references. 1345 // 1346 // According to C++ DR 106, references to references are only 1347 // diagnosed when they are written directly (e.g., "int & &"), 1348 // but not when they happen via a typedef: 1349 // 1350 // typedef int& intref; 1351 // typedef intref& intref2; 1352 // 1353 // Parser::ParseDeclaratorInternal diagnoses the case where 1354 // references are written directly; here, we handle the 1355 // collapsing of references-to-references as described in C++0x. 1356 // DR 106 and 540 introduce reference-collapsing into C++98/03. 1357 1358 // C++ [dcl.ref]p1: 1359 // A declarator that specifies the type "reference to cv void" 1360 // is ill-formed. 1361 if (T->isVoidType()) { 1362 Diag(Loc, diag::err_reference_to_void); 1363 return QualType(); 1364 } 1365 1366 // In ARC, it is forbidden to build references to unqualified pointers. 1367 if (getLangOpts().ObjCAutoRefCount) 1368 T = inferARCLifetimeForPointee(*this, T, Loc, /*reference*/ true); 1369 1370 // Handle restrict on references. 1371 if (LValueRef) 1372 return Context.getLValueReferenceType(T, SpelledAsLValue); 1373 return Context.getRValueReferenceType(T); 1374} 1375 1376/// Check whether the specified array size makes the array type a VLA. If so, 1377/// return true, if not, return the size of the array in SizeVal. 1378static bool isArraySizeVLA(Sema &S, Expr *ArraySize, llvm::APSInt &SizeVal) { 1379 // If the size is an ICE, it certainly isn't a VLA. If we're in a GNU mode 1380 // (like gnu99, but not c99) accept any evaluatable value as an extension. 1381 class VLADiagnoser : public Sema::VerifyICEDiagnoser { 1382 public: 1383 VLADiagnoser() : Sema::VerifyICEDiagnoser(true) {} 1384 1385 virtual void diagnoseNotICE(Sema &S, SourceLocation Loc, SourceRange SR) { 1386 } 1387 1388 virtual void diagnoseFold(Sema &S, SourceLocation Loc, SourceRange SR) { 1389 S.Diag(Loc, diag::ext_vla_folded_to_constant) << SR; 1390 } 1391 } Diagnoser; 1392 1393 return S.VerifyIntegerConstantExpression(ArraySize, &SizeVal, Diagnoser, 1394 S.LangOpts.GNUMode).isInvalid(); 1395} 1396 1397 1398/// \brief Build an array type. 1399/// 1400/// \param T The type of each element in the array. 1401/// 1402/// \param ASM C99 array size modifier (e.g., '*', 'static'). 1403/// 1404/// \param ArraySize Expression describing the size of the array. 1405/// 1406/// \param Brackets The range from the opening '[' to the closing ']'. 1407/// 1408/// \param Entity The name of the entity that involves the array 1409/// type, if known. 1410/// 1411/// \returns A suitable array type, if there are no errors. Otherwise, 1412/// returns a NULL type. 1413QualType Sema::BuildArrayType(QualType T, ArrayType::ArraySizeModifier ASM, 1414 Expr *ArraySize, unsigned Quals, 1415 SourceRange Brackets, DeclarationName Entity) { 1416 1417 SourceLocation Loc = Brackets.getBegin(); 1418 if (getLangOpts().CPlusPlus) { 1419 // C++ [dcl.array]p1: 1420 // T is called the array element type; this type shall not be a reference 1421 // type, the (possibly cv-qualified) type void, a function type or an 1422 // abstract class type. 1423 // 1424 // C++ [dcl.array]p3: 1425 // When several "array of" specifications are adjacent, [...] only the 1426 // first of the constant expressions that specify the bounds of the arrays 1427 // may be omitted. 1428 // 1429 // Note: function types are handled in the common path with C. 1430 if (T->isReferenceType()) { 1431 Diag(Loc, diag::err_illegal_decl_array_of_references) 1432 << getPrintableNameForEntity(Entity) << T; 1433 return QualType(); 1434 } 1435 1436 if (T->isVoidType() || T->isIncompleteArrayType()) { 1437 Diag(Loc, diag::err_illegal_decl_array_incomplete_type) << T; 1438 return QualType(); 1439 } 1440 1441 if (RequireNonAbstractType(Brackets.getBegin(), T, 1442 diag::err_array_of_abstract_type)) 1443 return QualType(); 1444 1445 } else { 1446 // C99 6.7.5.2p1: If the element type is an incomplete or function type, 1447 // reject it (e.g. void ary[7], struct foo ary[7], void ary[7]()) 1448 if (RequireCompleteType(Loc, T, 1449 diag::err_illegal_decl_array_incomplete_type)) 1450 return QualType(); 1451 } 1452 1453 if (T->isFunctionType()) { 1454 Diag(Loc, diag::err_illegal_decl_array_of_functions) 1455 << getPrintableNameForEntity(Entity) << T; 1456 return QualType(); 1457 } 1458 1459 if (T->getContainedAutoType()) { 1460 Diag(Loc, diag::err_illegal_decl_array_of_auto) 1461 << getPrintableNameForEntity(Entity) << T; 1462 return QualType(); 1463 } 1464 1465 if (const RecordType *EltTy = T->getAs<RecordType>()) { 1466 // If the element type is a struct or union that contains a variadic 1467 // array, accept it as a GNU extension: C99 6.7.2.1p2. 1468 if (EltTy->getDecl()->hasFlexibleArrayMember()) 1469 Diag(Loc, diag::ext_flexible_array_in_array) << T; 1470 } else if (T->isObjCObjectType()) { 1471 Diag(Loc, diag::err_objc_array_of_interfaces) << T; 1472 return QualType(); 1473 } 1474 1475 // Do placeholder conversions on the array size expression. 1476 if (ArraySize && ArraySize->hasPlaceholderType()) { 1477 ExprResult Result = CheckPlaceholderExpr(ArraySize); 1478 if (Result.isInvalid()) return QualType(); 1479 ArraySize = Result.take(); 1480 } 1481 1482 // Do lvalue-to-rvalue conversions on the array size expression. 1483 if (ArraySize && !ArraySize->isRValue()) { 1484 ExprResult Result = DefaultLvalueConversion(ArraySize); 1485 if (Result.isInvalid()) 1486 return QualType(); 1487 1488 ArraySize = Result.take(); 1489 } 1490 1491 // C99 6.7.5.2p1: The size expression shall have integer type. 1492 // C++11 allows contextual conversions to such types. 1493 if (!getLangOpts().CPlusPlus11 && 1494 ArraySize && !ArraySize->isTypeDependent() && 1495 !ArraySize->getType()->isIntegralOrUnscopedEnumerationType()) { 1496 Diag(ArraySize->getLocStart(), diag::err_array_size_non_int) 1497 << ArraySize->getType() << ArraySize->getSourceRange(); 1498 return QualType(); 1499 } 1500 1501 llvm::APSInt ConstVal(Context.getTypeSize(Context.getSizeType())); 1502 if (!ArraySize) { 1503 if (ASM == ArrayType::Star) 1504 T = Context.getVariableArrayType(T, 0, ASM, Quals, Brackets); 1505 else 1506 T = Context.getIncompleteArrayType(T, ASM, Quals); 1507 } else if (ArraySize->isTypeDependent() || ArraySize->isValueDependent()) { 1508 T = Context.getDependentSizedArrayType(T, ArraySize, ASM, Quals, Brackets); 1509 } else if ((!T->isDependentType() && !T->isIncompleteType() && 1510 !T->isConstantSizeType()) || 1511 isArraySizeVLA(*this, ArraySize, ConstVal)) { 1512 // Even in C++11, don't allow contextual conversions in the array bound 1513 // of a VLA. 1514 if (getLangOpts().CPlusPlus11 && 1515 !ArraySize->getType()->isIntegralOrUnscopedEnumerationType()) { 1516 Diag(ArraySize->getLocStart(), diag::err_array_size_non_int) 1517 << ArraySize->getType() << ArraySize->getSourceRange(); 1518 return QualType(); 1519 } 1520 1521 // C99: an array with an element type that has a non-constant-size is a VLA. 1522 // C99: an array with a non-ICE size is a VLA. We accept any expression 1523 // that we can fold to a non-zero positive value as an extension. 1524 T = Context.getVariableArrayType(T, ArraySize, ASM, Quals, Brackets); 1525 } else { 1526 // C99 6.7.5.2p1: If the expression is a constant expression, it shall 1527 // have a value greater than zero. 1528 if (ConstVal.isSigned() && ConstVal.isNegative()) { 1529 if (Entity) 1530 Diag(ArraySize->getLocStart(), diag::err_decl_negative_array_size) 1531 << getPrintableNameForEntity(Entity) << ArraySize->getSourceRange(); 1532 else 1533 Diag(ArraySize->getLocStart(), diag::err_typecheck_negative_array_size) 1534 << ArraySize->getSourceRange(); 1535 return QualType(); 1536 } 1537 if (ConstVal == 0) { 1538 // GCC accepts zero sized static arrays. We allow them when 1539 // we're not in a SFINAE context. 1540 Diag(ArraySize->getLocStart(), 1541 isSFINAEContext()? diag::err_typecheck_zero_array_size 1542 : diag::ext_typecheck_zero_array_size) 1543 << ArraySize->getSourceRange(); 1544 1545 if (ASM == ArrayType::Static) { 1546 Diag(ArraySize->getLocStart(), 1547 diag::warn_typecheck_zero_static_array_size) 1548 << ArraySize->getSourceRange(); 1549 ASM = ArrayType::Normal; 1550 } 1551 } else if (!T->isDependentType() && !T->isVariablyModifiedType() && 1552 !T->isIncompleteType()) { 1553 // Is the array too large? 1554 unsigned ActiveSizeBits 1555 = ConstantArrayType::getNumAddressingBits(Context, T, ConstVal); 1556 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) 1557 Diag(ArraySize->getLocStart(), diag::err_array_too_large) 1558 << ConstVal.toString(10) 1559 << ArraySize->getSourceRange(); 1560 } 1561 1562 T = Context.getConstantArrayType(T, ConstVal, ASM, Quals); 1563 } 1564 1565 // OpenCL v1.2 s6.9.d: variable length arrays are not supported. 1566 if (getLangOpts().OpenCL && T->isVariableArrayType()) { 1567 Diag(Loc, diag::err_opencl_vla); 1568 return QualType(); 1569 } 1570 // If this is not C99, extwarn about VLA's and C99 array size modifiers. 1571 if (!getLangOpts().C99) { 1572 if (T->isVariableArrayType()) { 1573 // Prohibit the use of non-POD types in VLAs. 1574 QualType BaseT = Context.getBaseElementType(T); 1575 if (!T->isDependentType() && 1576 !BaseT.isPODType(Context) && 1577 !BaseT->isObjCLifetimeType()) { 1578 Diag(Loc, diag::err_vla_non_pod) 1579 << BaseT; 1580 return QualType(); 1581 } 1582 // Prohibit the use of VLAs during template argument deduction. 1583 else if (isSFINAEContext()) { 1584 Diag(Loc, diag::err_vla_in_sfinae); 1585 return QualType(); 1586 } 1587 // Just extwarn about VLAs. 1588 else 1589 Diag(Loc, diag::ext_vla); 1590 } else if (ASM != ArrayType::Normal || Quals != 0) 1591 Diag(Loc, 1592 getLangOpts().CPlusPlus? diag::err_c99_array_usage_cxx 1593 : diag::ext_c99_array_usage) << ASM; 1594 } 1595 1596 if (T->isVariableArrayType()) { 1597 // Warn about VLAs for -Wvla. 1598 Diag(Loc, diag::warn_vla_used); 1599 } 1600 1601 return T; 1602} 1603 1604/// \brief Build an ext-vector type. 1605/// 1606/// Run the required checks for the extended vector type. 1607QualType Sema::BuildExtVectorType(QualType T, Expr *ArraySize, 1608 SourceLocation AttrLoc) { 1609 // unlike gcc's vector_size attribute, we do not allow vectors to be defined 1610 // in conjunction with complex types (pointers, arrays, functions, etc.). 1611 if (!T->isDependentType() && 1612 !T->isIntegerType() && !T->isRealFloatingType()) { 1613 Diag(AttrLoc, diag::err_attribute_invalid_vector_type) << T; 1614 return QualType(); 1615 } 1616 1617 if (!ArraySize->isTypeDependent() && !ArraySize->isValueDependent()) { 1618 llvm::APSInt vecSize(32); 1619 if (!ArraySize->isIntegerConstantExpr(vecSize, Context)) { 1620 Diag(AttrLoc, diag::err_attribute_argument_not_int) 1621 << "ext_vector_type" << ArraySize->getSourceRange(); 1622 return QualType(); 1623 } 1624 1625 // unlike gcc's vector_size attribute, the size is specified as the 1626 // number of elements, not the number of bytes. 1627 unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue()); 1628 1629 if (vectorSize == 0) { 1630 Diag(AttrLoc, diag::err_attribute_zero_size) 1631 << ArraySize->getSourceRange(); 1632 return QualType(); 1633 } 1634 1635 return Context.getExtVectorType(T, vectorSize); 1636 } 1637 1638 return Context.getDependentSizedExtVectorType(T, ArraySize, AttrLoc); 1639} 1640 1641QualType Sema::BuildFunctionType(QualType T, 1642 llvm::MutableArrayRef<QualType> ParamTypes, 1643 SourceLocation Loc, DeclarationName Entity, 1644 const FunctionProtoType::ExtProtoInfo &EPI) { 1645 if (T->isArrayType() || T->isFunctionType()) { 1646 Diag(Loc, diag::err_func_returning_array_function) 1647 << T->isFunctionType() << T; 1648 return QualType(); 1649 } 1650 1651 // Functions cannot return half FP. 1652 if (T->isHalfType()) { 1653 Diag(Loc, diag::err_parameters_retval_cannot_have_fp16_type) << 1 << 1654 FixItHint::CreateInsertion(Loc, "*"); 1655 return QualType(); 1656 } 1657 1658 bool Invalid = false; 1659 for (unsigned Idx = 0, Cnt = ParamTypes.size(); Idx < Cnt; ++Idx) { 1660 // FIXME: Loc is too inprecise here, should use proper locations for args. 1661 QualType ParamType = Context.getAdjustedParameterType(ParamTypes[Idx]); 1662 if (ParamType->isVoidType()) { 1663 Diag(Loc, diag::err_param_with_void_type); 1664 Invalid = true; 1665 } else if (ParamType->isHalfType()) { 1666 // Disallow half FP arguments. 1667 Diag(Loc, diag::err_parameters_retval_cannot_have_fp16_type) << 0 << 1668 FixItHint::CreateInsertion(Loc, "*"); 1669 Invalid = true; 1670 } 1671 1672 ParamTypes[Idx] = ParamType; 1673 } 1674 1675 if (Invalid) 1676 return QualType(); 1677 1678 return Context.getFunctionType(T, ParamTypes, EPI); 1679} 1680 1681/// \brief Build a member pointer type \c T Class::*. 1682/// 1683/// \param T the type to which the member pointer refers. 1684/// \param Class the class type into which the member pointer points. 1685/// \param Loc the location where this type begins 1686/// \param Entity the name of the entity that will have this member pointer type 1687/// 1688/// \returns a member pointer type, if successful, or a NULL type if there was 1689/// an error. 1690QualType Sema::BuildMemberPointerType(QualType T, QualType Class, 1691 SourceLocation Loc, 1692 DeclarationName Entity) { 1693 // Verify that we're not building a pointer to pointer to function with 1694 // exception specification. 1695 if (CheckDistantExceptionSpec(T)) { 1696 Diag(Loc, diag::err_distant_exception_spec); 1697 1698 // FIXME: If we're doing this as part of template instantiation, 1699 // we should return immediately. 1700 1701 // Build the type anyway, but use the canonical type so that the 1702 // exception specifiers are stripped off. 1703 T = Context.getCanonicalType(T); 1704 } 1705 1706 // C++ 8.3.3p3: A pointer to member shall not point to ... a member 1707 // with reference type, or "cv void." 1708 if (T->isReferenceType()) { 1709 Diag(Loc, diag::err_illegal_decl_mempointer_to_reference) 1710 << (Entity? Entity.getAsString() : "type name") << T; 1711 return QualType(); 1712 } 1713 1714 if (T->isVoidType()) { 1715 Diag(Loc, diag::err_illegal_decl_mempointer_to_void) 1716 << (Entity? Entity.getAsString() : "type name"); 1717 return QualType(); 1718 } 1719 1720 if (!Class->isDependentType() && !Class->isRecordType()) { 1721 Diag(Loc, diag::err_mempointer_in_nonclass_type) << Class; 1722 return QualType(); 1723 } 1724 1725 // C++ allows the class type in a member pointer to be an incomplete type. 1726 // In the Microsoft ABI, the size of the member pointer can vary 1727 // according to the class type, which means that we really need a 1728 // complete type if possible, which means we need to instantiate templates. 1729 // 1730 // For now, just require a complete type, which will instantiate 1731 // templates. This will also error if the type is just forward-declared, 1732 // which is a bug, but it's a bug that saves us from dealing with some 1733 // complexities at the moment. 1734 if (Context.getTargetInfo().getCXXABI().isMicrosoft() && 1735 RequireCompleteType(Loc, Class, diag::err_incomplete_type)) 1736 return QualType(); 1737 1738 return Context.getMemberPointerType(T, Class.getTypePtr()); 1739} 1740 1741/// \brief Build a block pointer type. 1742/// 1743/// \param T The type to which we'll be building a block pointer. 1744/// 1745/// \param Loc The source location, used for diagnostics. 1746/// 1747/// \param Entity The name of the entity that involves the block pointer 1748/// type, if known. 1749/// 1750/// \returns A suitable block pointer type, if there are no 1751/// errors. Otherwise, returns a NULL type. 1752QualType Sema::BuildBlockPointerType(QualType T, 1753 SourceLocation Loc, 1754 DeclarationName Entity) { 1755 if (!T->isFunctionType()) { 1756 Diag(Loc, diag::err_nonfunction_block_type); 1757 return QualType(); 1758 } 1759 1760 return Context.getBlockPointerType(T); 1761} 1762 1763QualType Sema::GetTypeFromParser(ParsedType Ty, TypeSourceInfo **TInfo) { 1764 QualType QT = Ty.get(); 1765 if (QT.isNull()) { 1766 if (TInfo) *TInfo = 0; 1767 return QualType(); 1768 } 1769 1770 TypeSourceInfo *DI = 0; 1771 if (const LocInfoType *LIT = dyn_cast<LocInfoType>(QT)) { 1772 QT = LIT->getType(); 1773 DI = LIT->getTypeSourceInfo(); 1774 } 1775 1776 if (TInfo) *TInfo = DI; 1777 return QT; 1778} 1779 1780static void transferARCOwnershipToDeclaratorChunk(TypeProcessingState &state, 1781 Qualifiers::ObjCLifetime ownership, 1782 unsigned chunkIndex); 1783 1784/// Given that this is the declaration of a parameter under ARC, 1785/// attempt to infer attributes and such for pointer-to-whatever 1786/// types. 1787static void inferARCWriteback(TypeProcessingState &state, 1788 QualType &declSpecType) { 1789 Sema &S = state.getSema(); 1790 Declarator &declarator = state.getDeclarator(); 1791 1792 // TODO: should we care about decl qualifiers? 1793 1794 // Check whether the declarator has the expected form. We walk 1795 // from the inside out in order to make the block logic work. 1796 unsigned outermostPointerIndex = 0; 1797 bool isBlockPointer = false; 1798 unsigned numPointers = 0; 1799 for (unsigned i = 0, e = declarator.getNumTypeObjects(); i != e; ++i) { 1800 unsigned chunkIndex = i; 1801 DeclaratorChunk &chunk = declarator.getTypeObject(chunkIndex); 1802 switch (chunk.Kind) { 1803 case DeclaratorChunk::Paren: 1804 // Ignore parens. 1805 break; 1806 1807 case DeclaratorChunk::Reference: 1808 case DeclaratorChunk::Pointer: 1809 // Count the number of pointers. Treat references 1810 // interchangeably as pointers; if they're mis-ordered, normal 1811 // type building will discover that. 1812 outermostPointerIndex = chunkIndex; 1813 numPointers++; 1814 break; 1815 1816 case DeclaratorChunk::BlockPointer: 1817 // If we have a pointer to block pointer, that's an acceptable 1818 // indirect reference; anything else is not an application of 1819 // the rules. 1820 if (numPointers != 1) return; 1821 numPointers++; 1822 outermostPointerIndex = chunkIndex; 1823 isBlockPointer = true; 1824 1825 // We don't care about pointer structure in return values here. 1826 goto done; 1827 1828 case DeclaratorChunk::Array: // suppress if written (id[])? 1829 case DeclaratorChunk::Function: 1830 case DeclaratorChunk::MemberPointer: 1831 return; 1832 } 1833 } 1834 done: 1835 1836 // If we have *one* pointer, then we want to throw the qualifier on 1837 // the declaration-specifiers, which means that it needs to be a 1838 // retainable object type. 1839 if (numPointers == 1) { 1840 // If it's not a retainable object type, the rule doesn't apply. 1841 if (!declSpecType->isObjCRetainableType()) return; 1842 1843 // If it already has lifetime, don't do anything. 1844 if (declSpecType.getObjCLifetime()) return; 1845 1846 // Otherwise, modify the type in-place. 1847 Qualifiers qs; 1848 1849 if (declSpecType->isObjCARCImplicitlyUnretainedType()) 1850 qs.addObjCLifetime(Qualifiers::OCL_ExplicitNone); 1851 else 1852 qs.addObjCLifetime(Qualifiers::OCL_Autoreleasing); 1853 declSpecType = S.Context.getQualifiedType(declSpecType, qs); 1854 1855 // If we have *two* pointers, then we want to throw the qualifier on 1856 // the outermost pointer. 1857 } else if (numPointers == 2) { 1858 // If we don't have a block pointer, we need to check whether the 1859 // declaration-specifiers gave us something that will turn into a 1860 // retainable object pointer after we slap the first pointer on it. 1861 if (!isBlockPointer && !declSpecType->isObjCObjectType()) 1862 return; 1863 1864 // Look for an explicit lifetime attribute there. 1865 DeclaratorChunk &chunk = declarator.getTypeObject(outermostPointerIndex); 1866 if (chunk.Kind != DeclaratorChunk::Pointer && 1867 chunk.Kind != DeclaratorChunk::BlockPointer) 1868 return; 1869 for (const AttributeList *attr = chunk.getAttrs(); attr; 1870 attr = attr->getNext()) 1871 if (attr->getKind() == AttributeList::AT_ObjCOwnership) 1872 return; 1873 1874 transferARCOwnershipToDeclaratorChunk(state, Qualifiers::OCL_Autoreleasing, 1875 outermostPointerIndex); 1876 1877 // Any other number of pointers/references does not trigger the rule. 1878 } else return; 1879 1880 // TODO: mark whether we did this inference? 1881} 1882 1883static void DiagnoseIgnoredQualifiers(unsigned Quals, 1884 SourceLocation ConstQualLoc, 1885 SourceLocation VolatileQualLoc, 1886 SourceLocation RestrictQualLoc, 1887 SourceLocation AtomicQualLoc, 1888 Sema& S) { 1889 std::string QualStr; 1890 unsigned NumQuals = 0; 1891 SourceLocation Loc; 1892 1893 FixItHint ConstFixIt; 1894 FixItHint VolatileFixIt; 1895 FixItHint RestrictFixIt; 1896 FixItHint AtomicFixIt; 1897 1898 const SourceManager &SM = S.getSourceManager(); 1899 1900 // FIXME: The locations here are set kind of arbitrarily. It'd be nicer to 1901 // find a range and grow it to encompass all the qualifiers, regardless of 1902 // the order in which they textually appear. 1903 if (Quals & DeclSpec::TQ_const) { 1904 ConstFixIt = FixItHint::CreateRemoval(ConstQualLoc); 1905 QualStr = "const"; 1906 ++NumQuals; 1907 if (!Loc.isValid() || SM.isBeforeInTranslationUnit(ConstQualLoc, Loc)) 1908 Loc = ConstQualLoc; 1909 } 1910 if (Quals & DeclSpec::TQ_volatile) { 1911 VolatileFixIt = FixItHint::CreateRemoval(VolatileQualLoc); 1912 QualStr += (NumQuals == 0 ? "volatile" : " volatile"); 1913 ++NumQuals; 1914 if (!Loc.isValid() || SM.isBeforeInTranslationUnit(VolatileQualLoc, Loc)) 1915 Loc = VolatileQualLoc; 1916 } 1917 if (Quals & DeclSpec::TQ_restrict) { 1918 RestrictFixIt = FixItHint::CreateRemoval(RestrictQualLoc); 1919 QualStr += (NumQuals == 0 ? "restrict" : " restrict"); 1920 ++NumQuals; 1921 if (!Loc.isValid() || SM.isBeforeInTranslationUnit(RestrictQualLoc, Loc)) 1922 Loc = RestrictQualLoc; 1923 } 1924 if (Quals & DeclSpec::TQ_atomic) { 1925 AtomicFixIt = FixItHint::CreateRemoval(AtomicQualLoc); 1926 QualStr += (NumQuals == 0 ? "_Atomic" : " _Atomic"); 1927 ++NumQuals; 1928 if (!Loc.isValid() || SM.isBeforeInTranslationUnit(AtomicQualLoc, Loc)) 1929 Loc = AtomicQualLoc; 1930 } 1931 1932 assert(NumQuals > 0 && "No known qualifiers?"); 1933 1934 S.Diag(Loc, diag::warn_qual_return_type) 1935 << QualStr << NumQuals 1936 << ConstFixIt << VolatileFixIt << RestrictFixIt << AtomicFixIt; 1937} 1938 1939static QualType GetDeclSpecTypeForDeclarator(TypeProcessingState &state, 1940 TypeSourceInfo *&ReturnTypeInfo) { 1941 Sema &SemaRef = state.getSema(); 1942 Declarator &D = state.getDeclarator(); 1943 QualType T; 1944 ReturnTypeInfo = 0; 1945 1946 // The TagDecl owned by the DeclSpec. 1947 TagDecl *OwnedTagDecl = 0; 1948 1949 switch (D.getName().getKind()) { 1950 case UnqualifiedId::IK_ImplicitSelfParam: 1951 case UnqualifiedId::IK_OperatorFunctionId: 1952 case UnqualifiedId::IK_Identifier: 1953 case UnqualifiedId::IK_LiteralOperatorId: 1954 case UnqualifiedId::IK_TemplateId: 1955 T = ConvertDeclSpecToType(state); 1956 1957 if (!D.isInvalidType() && D.getDeclSpec().isTypeSpecOwned()) { 1958 OwnedTagDecl = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 1959 // Owned declaration is embedded in declarator. 1960 OwnedTagDecl->setEmbeddedInDeclarator(true); 1961 } 1962 break; 1963 1964 case UnqualifiedId::IK_ConstructorName: 1965 case UnqualifiedId::IK_ConstructorTemplateId: 1966 case UnqualifiedId::IK_DestructorName: 1967 // Constructors and destructors don't have return types. Use 1968 // "void" instead. 1969 T = SemaRef.Context.VoidTy; 1970 if (AttributeList *attrs = D.getDeclSpec().getAttributes().getList()) 1971 processTypeAttrs(state, T, TAL_DeclSpec, attrs); 1972 break; 1973 1974 case UnqualifiedId::IK_ConversionFunctionId: 1975 // The result type of a conversion function is the type that it 1976 // converts to. 1977 T = SemaRef.GetTypeFromParser(D.getName().ConversionFunctionId, 1978 &ReturnTypeInfo); 1979 break; 1980 } 1981 1982 if (D.getAttributes()) 1983 distributeTypeAttrsFromDeclarator(state, T); 1984 1985 // C++11 [dcl.spec.auto]p5: reject 'auto' if it is not in an allowed context. 1986 // In C++11, a function declarator using 'auto' must have a trailing return 1987 // type (this is checked later) and we can skip this. In other languages 1988 // using auto, we need to check regardless. 1989 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto && 1990 (!SemaRef.getLangOpts().CPlusPlus11 || !D.isFunctionDeclarator())) { 1991 int Error = -1; 1992 1993 switch (D.getContext()) { 1994 case Declarator::KNRTypeListContext: 1995 llvm_unreachable("K&R type lists aren't allowed in C++"); 1996 case Declarator::LambdaExprContext: 1997 llvm_unreachable("Can't specify a type specifier in lambda grammar"); 1998 case Declarator::ObjCParameterContext: 1999 case Declarator::ObjCResultContext: 2000 case Declarator::PrototypeContext: 2001 Error = 0; // Function prototype 2002 break; 2003 case Declarator::MemberContext: 2004 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_static) 2005 break; 2006 switch (cast<TagDecl>(SemaRef.CurContext)->getTagKind()) { 2007 case TTK_Enum: llvm_unreachable("unhandled tag kind"); 2008 case TTK_Struct: Error = 1; /* Struct member */ break; 2009 case TTK_Union: Error = 2; /* Union member */ break; 2010 case TTK_Class: Error = 3; /* Class member */ break; 2011 case TTK_Interface: Error = 4; /* Interface member */ break; 2012 } 2013 break; 2014 case Declarator::CXXCatchContext: 2015 case Declarator::ObjCCatchContext: 2016 Error = 5; // Exception declaration 2017 break; 2018 case Declarator::TemplateParamContext: 2019 Error = 6; // Template parameter 2020 break; 2021 case Declarator::BlockLiteralContext: 2022 Error = 7; // Block literal 2023 break; 2024 case Declarator::TemplateTypeArgContext: 2025 Error = 8; // Template type argument 2026 break; 2027 case Declarator::AliasDeclContext: 2028 case Declarator::AliasTemplateContext: 2029 Error = 10; // Type alias 2030 break; 2031 case Declarator::TrailingReturnContext: 2032 Error = 11; // Function return type 2033 break; 2034 case Declarator::TypeNameContext: 2035 Error = 12; // Generic 2036 break; 2037 case Declarator::FileContext: 2038 case Declarator::BlockContext: 2039 case Declarator::ForContext: 2040 case Declarator::ConditionContext: 2041 case Declarator::CXXNewContext: 2042 break; 2043 } 2044 2045 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 2046 Error = 9; 2047 2048 // In Objective-C it is an error to use 'auto' on a function declarator. 2049 if (D.isFunctionDeclarator()) 2050 Error = 11; 2051 2052 // C++11 [dcl.spec.auto]p2: 'auto' is always fine if the declarator 2053 // contains a trailing return type. That is only legal at the outermost 2054 // level. Check all declarator chunks (outermost first) anyway, to give 2055 // better diagnostics. 2056 if (SemaRef.getLangOpts().CPlusPlus11 && Error != -1) { 2057 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 2058 unsigned chunkIndex = e - i - 1; 2059 state.setCurrentChunkIndex(chunkIndex); 2060 DeclaratorChunk &DeclType = D.getTypeObject(chunkIndex); 2061 if (DeclType.Kind == DeclaratorChunk::Function) { 2062 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun; 2063 if (FTI.hasTrailingReturnType()) { 2064 Error = -1; 2065 break; 2066 } 2067 } 2068 } 2069 } 2070 2071 if (Error != -1) { 2072 SemaRef.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 2073 diag::err_auto_not_allowed) 2074 << Error; 2075 T = SemaRef.Context.IntTy; 2076 D.setInvalidType(true); 2077 } else 2078 SemaRef.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 2079 diag::warn_cxx98_compat_auto_type_specifier); 2080 } 2081 2082 if (SemaRef.getLangOpts().CPlusPlus && 2083 OwnedTagDecl && OwnedTagDecl->isCompleteDefinition()) { 2084 // Check the contexts where C++ forbids the declaration of a new class 2085 // or enumeration in a type-specifier-seq. 2086 switch (D.getContext()) { 2087 case Declarator::TrailingReturnContext: 2088 // Class and enumeration definitions are syntactically not allowed in 2089 // trailing return types. 2090 llvm_unreachable("parser should not have allowed this"); 2091 break; 2092 case Declarator::FileContext: 2093 case Declarator::MemberContext: 2094 case Declarator::BlockContext: 2095 case Declarator::ForContext: 2096 case Declarator::BlockLiteralContext: 2097 case Declarator::LambdaExprContext: 2098 // C++11 [dcl.type]p3: 2099 // A type-specifier-seq shall not define a class or enumeration unless 2100 // it appears in the type-id of an alias-declaration (7.1.3) that is not 2101 // the declaration of a template-declaration. 2102 case Declarator::AliasDeclContext: 2103 break; 2104 case Declarator::AliasTemplateContext: 2105 SemaRef.Diag(OwnedTagDecl->getLocation(), 2106 diag::err_type_defined_in_alias_template) 2107 << SemaRef.Context.getTypeDeclType(OwnedTagDecl); 2108 D.setInvalidType(true); 2109 break; 2110 case Declarator::TypeNameContext: 2111 case Declarator::TemplateParamContext: 2112 case Declarator::CXXNewContext: 2113 case Declarator::CXXCatchContext: 2114 case Declarator::ObjCCatchContext: 2115 case Declarator::TemplateTypeArgContext: 2116 SemaRef.Diag(OwnedTagDecl->getLocation(), 2117 diag::err_type_defined_in_type_specifier) 2118 << SemaRef.Context.getTypeDeclType(OwnedTagDecl); 2119 D.setInvalidType(true); 2120 break; 2121 case Declarator::PrototypeContext: 2122 case Declarator::ObjCParameterContext: 2123 case Declarator::ObjCResultContext: 2124 case Declarator::KNRTypeListContext: 2125 // C++ [dcl.fct]p6: 2126 // Types shall not be defined in return or parameter types. 2127 SemaRef.Diag(OwnedTagDecl->getLocation(), 2128 diag::err_type_defined_in_param_type) 2129 << SemaRef.Context.getTypeDeclType(OwnedTagDecl); 2130 D.setInvalidType(true); 2131 break; 2132 case Declarator::ConditionContext: 2133 // C++ 6.4p2: 2134 // The type-specifier-seq shall not contain typedef and shall not declare 2135 // a new class or enumeration. 2136 SemaRef.Diag(OwnedTagDecl->getLocation(), 2137 diag::err_type_defined_in_condition); 2138 D.setInvalidType(true); 2139 break; 2140 } 2141 } 2142 2143 return T; 2144} 2145 2146static std::string getFunctionQualifiersAsString(const FunctionProtoType *FnTy){ 2147 std::string Quals = 2148 Qualifiers::fromCVRMask(FnTy->getTypeQuals()).getAsString(); 2149 2150 switch (FnTy->getRefQualifier()) { 2151 case RQ_None: 2152 break; 2153 2154 case RQ_LValue: 2155 if (!Quals.empty()) 2156 Quals += ' '; 2157 Quals += '&'; 2158 break; 2159 2160 case RQ_RValue: 2161 if (!Quals.empty()) 2162 Quals += ' '; 2163 Quals += "&&"; 2164 break; 2165 } 2166 2167 return Quals; 2168} 2169 2170/// Check that the function type T, which has a cv-qualifier or a ref-qualifier, 2171/// can be contained within the declarator chunk DeclType, and produce an 2172/// appropriate diagnostic if not. 2173static void checkQualifiedFunction(Sema &S, QualType T, 2174 DeclaratorChunk &DeclType) { 2175 // C++98 [dcl.fct]p4 / C++11 [dcl.fct]p6: a function type with a 2176 // cv-qualifier or a ref-qualifier can only appear at the topmost level 2177 // of a type. 2178 int DiagKind = -1; 2179 switch (DeclType.Kind) { 2180 case DeclaratorChunk::Paren: 2181 case DeclaratorChunk::MemberPointer: 2182 // These cases are permitted. 2183 return; 2184 case DeclaratorChunk::Array: 2185 case DeclaratorChunk::Function: 2186 // These cases don't allow function types at all; no need to diagnose the 2187 // qualifiers separately. 2188 return; 2189 case DeclaratorChunk::BlockPointer: 2190 DiagKind = 0; 2191 break; 2192 case DeclaratorChunk::Pointer: 2193 DiagKind = 1; 2194 break; 2195 case DeclaratorChunk::Reference: 2196 DiagKind = 2; 2197 break; 2198 } 2199 2200 assert(DiagKind != -1); 2201 S.Diag(DeclType.Loc, diag::err_compound_qualified_function_type) 2202 << DiagKind << isa<FunctionType>(T.IgnoreParens()) << T 2203 << getFunctionQualifiersAsString(T->castAs<FunctionProtoType>()); 2204} 2205 2206/// Produce an approprioate diagnostic for an ambiguity between a function 2207/// declarator and a C++ direct-initializer. 2208static void warnAboutAmbiguousFunction(Sema &S, Declarator &D, 2209 DeclaratorChunk &DeclType, QualType RT) { 2210 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun; 2211 assert(FTI.isAmbiguous && "no direct-initializer / function ambiguity"); 2212 2213 // If the return type is void there is no ambiguity. 2214 if (RT->isVoidType()) 2215 return; 2216 2217 // An initializer for a non-class type can have at most one argument. 2218 if (!RT->isRecordType() && FTI.NumArgs > 1) 2219 return; 2220 2221 // An initializer for a reference must have exactly one argument. 2222 if (RT->isReferenceType() && FTI.NumArgs != 1) 2223 return; 2224 2225 // Only warn if this declarator is declaring a function at block scope, and 2226 // doesn't have a storage class (such as 'extern') specified. 2227 if (!D.isFunctionDeclarator() || 2228 D.getFunctionDefinitionKind() != FDK_Declaration || 2229 !S.CurContext->isFunctionOrMethod() || 2230 D.getDeclSpec().getStorageClassSpecAsWritten() 2231 != DeclSpec::SCS_unspecified) 2232 return; 2233 2234 // Inside a condition, a direct initializer is not permitted. We allow one to 2235 // be parsed in order to give better diagnostics in condition parsing. 2236 if (D.getContext() == Declarator::ConditionContext) 2237 return; 2238 2239 SourceRange ParenRange(DeclType.Loc, DeclType.EndLoc); 2240 2241 S.Diag(DeclType.Loc, 2242 FTI.NumArgs ? diag::warn_parens_disambiguated_as_function_declaration 2243 : diag::warn_empty_parens_are_function_decl) 2244 << ParenRange; 2245 2246 // If the declaration looks like: 2247 // T var1, 2248 // f(); 2249 // and name lookup finds a function named 'f', then the ',' was 2250 // probably intended to be a ';'. 2251 if (!D.isFirstDeclarator() && D.getIdentifier()) { 2252 FullSourceLoc Comma(D.getCommaLoc(), S.SourceMgr); 2253 FullSourceLoc Name(D.getIdentifierLoc(), S.SourceMgr); 2254 if (Comma.getFileID() != Name.getFileID() || 2255 Comma.getSpellingLineNumber() != Name.getSpellingLineNumber()) { 2256 LookupResult Result(S, D.getIdentifier(), SourceLocation(), 2257 Sema::LookupOrdinaryName); 2258 if (S.LookupName(Result, S.getCurScope())) 2259 S.Diag(D.getCommaLoc(), diag::note_empty_parens_function_call) 2260 << FixItHint::CreateReplacement(D.getCommaLoc(), ";") 2261 << D.getIdentifier(); 2262 } 2263 } 2264 2265 if (FTI.NumArgs > 0) { 2266 // For a declaration with parameters, eg. "T var(T());", suggest adding parens 2267 // around the first parameter to turn the declaration into a variable 2268 // declaration. 2269 SourceRange Range = FTI.ArgInfo[0].Param->getSourceRange(); 2270 SourceLocation B = Range.getBegin(); 2271 SourceLocation E = S.PP.getLocForEndOfToken(Range.getEnd()); 2272 // FIXME: Maybe we should suggest adding braces instead of parens 2273 // in C++11 for classes that don't have an initializer_list constructor. 2274 S.Diag(B, diag::note_additional_parens_for_variable_declaration) 2275 << FixItHint::CreateInsertion(B, "(") 2276 << FixItHint::CreateInsertion(E, ")"); 2277 } else { 2278 // For a declaration without parameters, eg. "T var();", suggest replacing the 2279 // parens with an initializer to turn the declaration into a variable 2280 // declaration. 2281 const CXXRecordDecl *RD = RT->getAsCXXRecordDecl(); 2282 2283 // Empty parens mean value-initialization, and no parens mean 2284 // default initialization. These are equivalent if the default 2285 // constructor is user-provided or if zero-initialization is a 2286 // no-op. 2287 if (RD && RD->hasDefinition() && 2288 (RD->isEmpty() || RD->hasUserProvidedDefaultConstructor())) 2289 S.Diag(DeclType.Loc, diag::note_empty_parens_default_ctor) 2290 << FixItHint::CreateRemoval(ParenRange); 2291 else { 2292 std::string Init = S.getFixItZeroInitializerForType(RT); 2293 if (Init.empty() && S.LangOpts.CPlusPlus11) 2294 Init = "{}"; 2295 if (!Init.empty()) 2296 S.Diag(DeclType.Loc, diag::note_empty_parens_zero_initialize) 2297 << FixItHint::CreateReplacement(ParenRange, Init); 2298 } 2299 } 2300} 2301 2302static TypeSourceInfo *GetFullTypeForDeclarator(TypeProcessingState &state, 2303 QualType declSpecType, 2304 TypeSourceInfo *TInfo) { 2305 2306 QualType T = declSpecType; 2307 Declarator &D = state.getDeclarator(); 2308 Sema &S = state.getSema(); 2309 ASTContext &Context = S.Context; 2310 const LangOptions &LangOpts = S.getLangOpts(); 2311 2312 // The name we're declaring, if any. 2313 DeclarationName Name; 2314 if (D.getIdentifier()) 2315 Name = D.getIdentifier(); 2316 2317 // Does this declaration declare a typedef-name? 2318 bool IsTypedefName = 2319 D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef || 2320 D.getContext() == Declarator::AliasDeclContext || 2321 D.getContext() == Declarator::AliasTemplateContext; 2322 2323 // Does T refer to a function type with a cv-qualifier or a ref-qualifier? 2324 bool IsQualifiedFunction = T->isFunctionProtoType() && 2325 (T->castAs<FunctionProtoType>()->getTypeQuals() != 0 || 2326 T->castAs<FunctionProtoType>()->getRefQualifier() != RQ_None); 2327 2328 // Walk the DeclTypeInfo, building the recursive type as we go. 2329 // DeclTypeInfos are ordered from the identifier out, which is 2330 // opposite of what we want :). 2331 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 2332 unsigned chunkIndex = e - i - 1; 2333 state.setCurrentChunkIndex(chunkIndex); 2334 DeclaratorChunk &DeclType = D.getTypeObject(chunkIndex); 2335 if (IsQualifiedFunction) { 2336 checkQualifiedFunction(S, T, DeclType); 2337 IsQualifiedFunction = DeclType.Kind == DeclaratorChunk::Paren; 2338 } 2339 switch (DeclType.Kind) { 2340 case DeclaratorChunk::Paren: 2341 T = S.BuildParenType(T); 2342 break; 2343 case DeclaratorChunk::BlockPointer: 2344 // If blocks are disabled, emit an error. 2345 if (!LangOpts.Blocks) 2346 S.Diag(DeclType.Loc, diag::err_blocks_disable); 2347 2348 T = S.BuildBlockPointerType(T, D.getIdentifierLoc(), Name); 2349 if (DeclType.Cls.TypeQuals) 2350 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Cls.TypeQuals); 2351 break; 2352 case DeclaratorChunk::Pointer: 2353 // Verify that we're not building a pointer to pointer to function with 2354 // exception specification. 2355 if (LangOpts.CPlusPlus && S.CheckDistantExceptionSpec(T)) { 2356 S.Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 2357 D.setInvalidType(true); 2358 // Build the type anyway. 2359 } 2360 if (LangOpts.ObjC1 && T->getAs<ObjCObjectType>()) { 2361 T = Context.getObjCObjectPointerType(T); 2362 if (DeclType.Ptr.TypeQuals) 2363 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Ptr.TypeQuals); 2364 break; 2365 } 2366 T = S.BuildPointerType(T, DeclType.Loc, Name); 2367 if (DeclType.Ptr.TypeQuals) 2368 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Ptr.TypeQuals); 2369 2370 break; 2371 case DeclaratorChunk::Reference: { 2372 // Verify that we're not building a reference to pointer to function with 2373 // exception specification. 2374 if (LangOpts.CPlusPlus && S.CheckDistantExceptionSpec(T)) { 2375 S.Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 2376 D.setInvalidType(true); 2377 // Build the type anyway. 2378 } 2379 T = S.BuildReferenceType(T, DeclType.Ref.LValueRef, DeclType.Loc, Name); 2380 2381 Qualifiers Quals; 2382 if (DeclType.Ref.HasRestrict) 2383 T = S.BuildQualifiedType(T, DeclType.Loc, Qualifiers::Restrict); 2384 break; 2385 } 2386 case DeclaratorChunk::Array: { 2387 // Verify that we're not building an array of pointers to function with 2388 // exception specification. 2389 if (LangOpts.CPlusPlus && S.CheckDistantExceptionSpec(T)) { 2390 S.Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 2391 D.setInvalidType(true); 2392 // Build the type anyway. 2393 } 2394 DeclaratorChunk::ArrayTypeInfo &ATI = DeclType.Arr; 2395 Expr *ArraySize = static_cast<Expr*>(ATI.NumElts); 2396 ArrayType::ArraySizeModifier ASM; 2397 if (ATI.isStar) 2398 ASM = ArrayType::Star; 2399 else if (ATI.hasStatic) 2400 ASM = ArrayType::Static; 2401 else 2402 ASM = ArrayType::Normal; 2403 if (ASM == ArrayType::Star && !D.isPrototypeContext()) { 2404 // FIXME: This check isn't quite right: it allows star in prototypes 2405 // for function definitions, and disallows some edge cases detailed 2406 // in http://gcc.gnu.org/ml/gcc-patches/2009-02/msg00133.html 2407 S.Diag(DeclType.Loc, diag::err_array_star_outside_prototype); 2408 ASM = ArrayType::Normal; 2409 D.setInvalidType(true); 2410 } 2411 2412 // C99 6.7.5.2p1: The optional type qualifiers and the keyword static 2413 // shall appear only in a declaration of a function parameter with an 2414 // array type, ... 2415 if (ASM == ArrayType::Static || ATI.TypeQuals) { 2416 if (!(D.isPrototypeContext() || 2417 D.getContext() == Declarator::KNRTypeListContext)) { 2418 S.Diag(DeclType.Loc, diag::err_array_static_outside_prototype) << 2419 (ASM == ArrayType::Static ? "'static'" : "type qualifier"); 2420 // Remove the 'static' and the type qualifiers. 2421 if (ASM == ArrayType::Static) 2422 ASM = ArrayType::Normal; 2423 ATI.TypeQuals = 0; 2424 D.setInvalidType(true); 2425 } 2426 2427 // C99 6.7.5.2p1: ... and then only in the outermost array type 2428 // derivation. 2429 unsigned x = chunkIndex; 2430 while (x != 0) { 2431 // Walk outwards along the declarator chunks. 2432 x--; 2433 const DeclaratorChunk &DC = D.getTypeObject(x); 2434 switch (DC.Kind) { 2435 case DeclaratorChunk::Paren: 2436 continue; 2437 case DeclaratorChunk::Array: 2438 case DeclaratorChunk::Pointer: 2439 case DeclaratorChunk::Reference: 2440 case DeclaratorChunk::MemberPointer: 2441 S.Diag(DeclType.Loc, diag::err_array_static_not_outermost) << 2442 (ASM == ArrayType::Static ? "'static'" : "type qualifier"); 2443 if (ASM == ArrayType::Static) 2444 ASM = ArrayType::Normal; 2445 ATI.TypeQuals = 0; 2446 D.setInvalidType(true); 2447 break; 2448 case DeclaratorChunk::Function: 2449 case DeclaratorChunk::BlockPointer: 2450 // These are invalid anyway, so just ignore. 2451 break; 2452 } 2453 } 2454 } 2455 2456 T = S.BuildArrayType(T, ASM, ArraySize, ATI.TypeQuals, 2457 SourceRange(DeclType.Loc, DeclType.EndLoc), Name); 2458 break; 2459 } 2460 case DeclaratorChunk::Function: { 2461 // If the function declarator has a prototype (i.e. it is not () and 2462 // does not have a K&R-style identifier list), then the arguments are part 2463 // of the type, otherwise the argument list is (). 2464 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun; 2465 IsQualifiedFunction = FTI.TypeQuals || FTI.hasRefQualifier(); 2466 2467 // Check for auto functions and trailing return type and adjust the 2468 // return type accordingly. 2469 if (!D.isInvalidType()) { 2470 // trailing-return-type is only required if we're declaring a function, 2471 // and not, for instance, a pointer to a function. 2472 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto && 2473 !FTI.hasTrailingReturnType() && chunkIndex == 0) { 2474 S.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 2475 diag::err_auto_missing_trailing_return); 2476 T = Context.IntTy; 2477 D.setInvalidType(true); 2478 } else if (FTI.hasTrailingReturnType()) { 2479 // T must be exactly 'auto' at this point. See CWG issue 681. 2480 if (isa<ParenType>(T)) { 2481 S.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 2482 diag::err_trailing_return_in_parens) 2483 << T << D.getDeclSpec().getSourceRange(); 2484 D.setInvalidType(true); 2485 } else if (D.getContext() != Declarator::LambdaExprContext && 2486 (T.hasQualifiers() || !isa<AutoType>(T))) { 2487 S.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 2488 diag::err_trailing_return_without_auto) 2489 << T << D.getDeclSpec().getSourceRange(); 2490 D.setInvalidType(true); 2491 } 2492 T = S.GetTypeFromParser(FTI.getTrailingReturnType(), &TInfo); 2493 if (T.isNull()) { 2494 // An error occurred parsing the trailing return type. 2495 T = Context.IntTy; 2496 D.setInvalidType(true); 2497 } 2498 } 2499 } 2500 2501 // C99 6.7.5.3p1: The return type may not be a function or array type. 2502 // For conversion functions, we'll diagnose this particular error later. 2503 if ((T->isArrayType() || T->isFunctionType()) && 2504 (D.getName().getKind() != UnqualifiedId::IK_ConversionFunctionId)) { 2505 unsigned diagID = diag::err_func_returning_array_function; 2506 // Last processing chunk in block context means this function chunk 2507 // represents the block. 2508 if (chunkIndex == 0 && 2509 D.getContext() == Declarator::BlockLiteralContext) 2510 diagID = diag::err_block_returning_array_function; 2511 S.Diag(DeclType.Loc, diagID) << T->isFunctionType() << T; 2512 T = Context.IntTy; 2513 D.setInvalidType(true); 2514 } 2515 2516 // Do not allow returning half FP value. 2517 // FIXME: This really should be in BuildFunctionType. 2518 if (T->isHalfType()) { 2519 if (S.getLangOpts().OpenCL) { 2520 if (!S.getOpenCLOptions().cl_khr_fp16) { 2521 S.Diag(D.getIdentifierLoc(), diag::err_opencl_half_return) << T; 2522 D.setInvalidType(true); 2523 } 2524 } else { 2525 S.Diag(D.getIdentifierLoc(), 2526 diag::err_parameters_retval_cannot_have_fp16_type) << 1; 2527 D.setInvalidType(true); 2528 } 2529 } 2530 2531 // cv-qualifiers on return types are pointless except when the type is a 2532 // class type in C++. 2533 if (isa<PointerType>(T) && T.getLocalCVRQualifiers() && 2534 (D.getName().getKind() != UnqualifiedId::IK_ConversionFunctionId) && 2535 (!LangOpts.CPlusPlus || !T->isDependentType())) { 2536 assert(chunkIndex + 1 < e && "No DeclaratorChunk for the return type?"); 2537 DeclaratorChunk ReturnTypeChunk = D.getTypeObject(chunkIndex + 1); 2538 assert(ReturnTypeChunk.Kind == DeclaratorChunk::Pointer); 2539 2540 DeclaratorChunk::PointerTypeInfo &PTI = ReturnTypeChunk.Ptr; 2541 2542 DiagnoseIgnoredQualifiers(PTI.TypeQuals, 2543 SourceLocation::getFromRawEncoding(PTI.ConstQualLoc), 2544 SourceLocation::getFromRawEncoding(PTI.VolatileQualLoc), 2545 SourceLocation::getFromRawEncoding(PTI.RestrictQualLoc), 2546 SourceLocation::getFromRawEncoding(PTI.AtomicQualLoc), 2547 S); 2548 2549 } else if (T.getCVRQualifiers() && D.getDeclSpec().getTypeQualifiers() && 2550 (!LangOpts.CPlusPlus || 2551 (!T->isDependentType() && !T->isRecordType()))) { 2552 2553 DiagnoseIgnoredQualifiers(D.getDeclSpec().getTypeQualifiers(), 2554 D.getDeclSpec().getConstSpecLoc(), 2555 D.getDeclSpec().getVolatileSpecLoc(), 2556 D.getDeclSpec().getRestrictSpecLoc(), 2557 D.getDeclSpec().getAtomicSpecLoc(), 2558 S); 2559 } 2560 2561 // Objective-C ARC ownership qualifiers are ignored on the function 2562 // return type (by type canonicalization). Complain if this attribute 2563 // was written here. 2564 if (T.getQualifiers().hasObjCLifetime()) { 2565 SourceLocation AttrLoc; 2566 if (chunkIndex + 1 < D.getNumTypeObjects()) { 2567 DeclaratorChunk ReturnTypeChunk = D.getTypeObject(chunkIndex + 1); 2568 for (const AttributeList *Attr = ReturnTypeChunk.getAttrs(); 2569 Attr; Attr = Attr->getNext()) { 2570 if (Attr->getKind() == AttributeList::AT_ObjCOwnership) { 2571 AttrLoc = Attr->getLoc(); 2572 break; 2573 } 2574 } 2575 } 2576 if (AttrLoc.isInvalid()) { 2577 for (const AttributeList *Attr 2578 = D.getDeclSpec().getAttributes().getList(); 2579 Attr; Attr = Attr->getNext()) { 2580 if (Attr->getKind() == AttributeList::AT_ObjCOwnership) { 2581 AttrLoc = Attr->getLoc(); 2582 break; 2583 } 2584 } 2585 } 2586 2587 if (AttrLoc.isValid()) { 2588 // The ownership attributes are almost always written via 2589 // the predefined 2590 // __strong/__weak/__autoreleasing/__unsafe_unretained. 2591 if (AttrLoc.isMacroID()) 2592 AttrLoc = S.SourceMgr.getImmediateExpansionRange(AttrLoc).first; 2593 2594 S.Diag(AttrLoc, diag::warn_arc_lifetime_result_type) 2595 << T.getQualifiers().getObjCLifetime(); 2596 } 2597 } 2598 2599 if (LangOpts.CPlusPlus && D.getDeclSpec().isTypeSpecOwned()) { 2600 // C++ [dcl.fct]p6: 2601 // Types shall not be defined in return or parameter types. 2602 TagDecl *Tag = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 2603 if (Tag->isCompleteDefinition()) 2604 S.Diag(Tag->getLocation(), diag::err_type_defined_in_result_type) 2605 << Context.getTypeDeclType(Tag); 2606 } 2607 2608 // Exception specs are not allowed in typedefs. Complain, but add it 2609 // anyway. 2610 if (IsTypedefName && FTI.getExceptionSpecType()) 2611 S.Diag(FTI.getExceptionSpecLoc(), diag::err_exception_spec_in_typedef) 2612 << (D.getContext() == Declarator::AliasDeclContext || 2613 D.getContext() == Declarator::AliasTemplateContext); 2614 2615 // If we see "T var();" or "T var(T());" at block scope, it is probably 2616 // an attempt to initialize a variable, not a function declaration. 2617 if (FTI.isAmbiguous) 2618 warnAboutAmbiguousFunction(S, D, DeclType, T); 2619 2620 if (!FTI.NumArgs && !FTI.isVariadic && !LangOpts.CPlusPlus) { 2621 // Simple void foo(), where the incoming T is the result type. 2622 T = Context.getFunctionNoProtoType(T); 2623 } else { 2624 // We allow a zero-parameter variadic function in C if the 2625 // function is marked with the "overloadable" attribute. Scan 2626 // for this attribute now. 2627 if (!FTI.NumArgs && FTI.isVariadic && !LangOpts.CPlusPlus) { 2628 bool Overloadable = false; 2629 for (const AttributeList *Attrs = D.getAttributes(); 2630 Attrs; Attrs = Attrs->getNext()) { 2631 if (Attrs->getKind() == AttributeList::AT_Overloadable) { 2632 Overloadable = true; 2633 break; 2634 } 2635 } 2636 2637 if (!Overloadable) 2638 S.Diag(FTI.getEllipsisLoc(), diag::err_ellipsis_first_arg); 2639 } 2640 2641 if (FTI.NumArgs && FTI.ArgInfo[0].Param == 0) { 2642 // C99 6.7.5.3p3: Reject int(x,y,z) when it's not a function 2643 // definition. 2644 S.Diag(FTI.ArgInfo[0].IdentLoc, diag::err_ident_list_in_fn_declaration); 2645 D.setInvalidType(true); 2646 // Recover by creating a K&R-style function type. 2647 T = Context.getFunctionNoProtoType(T); 2648 break; 2649 } 2650 2651 FunctionProtoType::ExtProtoInfo EPI; 2652 EPI.Variadic = FTI.isVariadic; 2653 EPI.HasTrailingReturn = FTI.hasTrailingReturnType(); 2654 EPI.TypeQuals = FTI.TypeQuals; 2655 EPI.RefQualifier = !FTI.hasRefQualifier()? RQ_None 2656 : FTI.RefQualifierIsLValueRef? RQ_LValue 2657 : RQ_RValue; 2658 2659 // Otherwise, we have a function with an argument list that is 2660 // potentially variadic. 2661 SmallVector<QualType, 16> ArgTys; 2662 ArgTys.reserve(FTI.NumArgs); 2663 2664 SmallVector<bool, 16> ConsumedArguments; 2665 ConsumedArguments.reserve(FTI.NumArgs); 2666 bool HasAnyConsumedArguments = false; 2667 2668 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 2669 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 2670 QualType ArgTy = Param->getType(); 2671 assert(!ArgTy.isNull() && "Couldn't parse type?"); 2672 2673 // Adjust the parameter type. 2674 assert((ArgTy == Context.getAdjustedParameterType(ArgTy)) && 2675 "Unadjusted type?"); 2676 2677 // Look for 'void'. void is allowed only as a single argument to a 2678 // function with no other parameters (C99 6.7.5.3p10). We record 2679 // int(void) as a FunctionProtoType with an empty argument list. 2680 if (ArgTy->isVoidType()) { 2681 // If this is something like 'float(int, void)', reject it. 'void' 2682 // is an incomplete type (C99 6.2.5p19) and function decls cannot 2683 // have arguments of incomplete type. 2684 if (FTI.NumArgs != 1 || FTI.isVariadic) { 2685 S.Diag(DeclType.Loc, diag::err_void_only_param); 2686 ArgTy = Context.IntTy; 2687 Param->setType(ArgTy); 2688 } else if (FTI.ArgInfo[i].Ident) { 2689 // Reject, but continue to parse 'int(void abc)'. 2690 S.Diag(FTI.ArgInfo[i].IdentLoc, 2691 diag::err_param_with_void_type); 2692 ArgTy = Context.IntTy; 2693 Param->setType(ArgTy); 2694 } else { 2695 // Reject, but continue to parse 'float(const void)'. 2696 if (ArgTy.hasQualifiers()) 2697 S.Diag(DeclType.Loc, diag::err_void_param_qualified); 2698 2699 // Do not add 'void' to the ArgTys list. 2700 break; 2701 } 2702 } else if (ArgTy->isHalfType()) { 2703 // Disallow half FP arguments. 2704 // FIXME: This really should be in BuildFunctionType. 2705 if (S.getLangOpts().OpenCL) { 2706 if (!S.getOpenCLOptions().cl_khr_fp16) { 2707 S.Diag(Param->getLocation(), 2708 diag::err_opencl_half_argument) << ArgTy; 2709 D.setInvalidType(); 2710 Param->setInvalidDecl(); 2711 } 2712 } else { 2713 S.Diag(Param->getLocation(), 2714 diag::err_parameters_retval_cannot_have_fp16_type) << 0; 2715 D.setInvalidType(); 2716 } 2717 } else if (!FTI.hasPrototype) { 2718 if (ArgTy->isPromotableIntegerType()) { 2719 ArgTy = Context.getPromotedIntegerType(ArgTy); 2720 Param->setKNRPromoted(true); 2721 } else if (const BuiltinType* BTy = ArgTy->getAs<BuiltinType>()) { 2722 if (BTy->getKind() == BuiltinType::Float) { 2723 ArgTy = Context.DoubleTy; 2724 Param->setKNRPromoted(true); 2725 } 2726 } 2727 } 2728 2729 if (LangOpts.ObjCAutoRefCount) { 2730 bool Consumed = Param->hasAttr<NSConsumedAttr>(); 2731 ConsumedArguments.push_back(Consumed); 2732 HasAnyConsumedArguments |= Consumed; 2733 } 2734 2735 ArgTys.push_back(ArgTy); 2736 } 2737 2738 if (HasAnyConsumedArguments) 2739 EPI.ConsumedArguments = ConsumedArguments.data(); 2740 2741 SmallVector<QualType, 4> Exceptions; 2742 SmallVector<ParsedType, 2> DynamicExceptions; 2743 SmallVector<SourceRange, 2> DynamicExceptionRanges; 2744 Expr *NoexceptExpr = 0; 2745 2746 if (FTI.getExceptionSpecType() == EST_Dynamic) { 2747 // FIXME: It's rather inefficient to have to split into two vectors 2748 // here. 2749 unsigned N = FTI.NumExceptions; 2750 DynamicExceptions.reserve(N); 2751 DynamicExceptionRanges.reserve(N); 2752 for (unsigned I = 0; I != N; ++I) { 2753 DynamicExceptions.push_back(FTI.Exceptions[I].Ty); 2754 DynamicExceptionRanges.push_back(FTI.Exceptions[I].Range); 2755 } 2756 } else if (FTI.getExceptionSpecType() == EST_ComputedNoexcept) { 2757 NoexceptExpr = FTI.NoexceptExpr; 2758 } 2759 2760 S.checkExceptionSpecification(FTI.getExceptionSpecType(), 2761 DynamicExceptions, 2762 DynamicExceptionRanges, 2763 NoexceptExpr, 2764 Exceptions, 2765 EPI); 2766 2767 T = Context.getFunctionType(T, ArgTys, EPI); 2768 } 2769 2770 break; 2771 } 2772 case DeclaratorChunk::MemberPointer: 2773 // The scope spec must refer to a class, or be dependent. 2774 CXXScopeSpec &SS = DeclType.Mem.Scope(); 2775 QualType ClsType; 2776 if (SS.isInvalid()) { 2777 // Avoid emitting extra errors if we already errored on the scope. 2778 D.setInvalidType(true); 2779 } else if (S.isDependentScopeSpecifier(SS) || 2780 dyn_cast_or_null<CXXRecordDecl>(S.computeDeclContext(SS))) { 2781 NestedNameSpecifier *NNS 2782 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 2783 NestedNameSpecifier *NNSPrefix = NNS->getPrefix(); 2784 switch (NNS->getKind()) { 2785 case NestedNameSpecifier::Identifier: 2786 ClsType = Context.getDependentNameType(ETK_None, NNSPrefix, 2787 NNS->getAsIdentifier()); 2788 break; 2789 2790 case NestedNameSpecifier::Namespace: 2791 case NestedNameSpecifier::NamespaceAlias: 2792 case NestedNameSpecifier::Global: 2793 llvm_unreachable("Nested-name-specifier must name a type"); 2794 2795 case NestedNameSpecifier::TypeSpec: 2796 case NestedNameSpecifier::TypeSpecWithTemplate: 2797 ClsType = QualType(NNS->getAsType(), 0); 2798 // Note: if the NNS has a prefix and ClsType is a nondependent 2799 // TemplateSpecializationType, then the NNS prefix is NOT included 2800 // in ClsType; hence we wrap ClsType into an ElaboratedType. 2801 // NOTE: in particular, no wrap occurs if ClsType already is an 2802 // Elaborated, DependentName, or DependentTemplateSpecialization. 2803 if (NNSPrefix && isa<TemplateSpecializationType>(NNS->getAsType())) 2804 ClsType = Context.getElaboratedType(ETK_None, NNSPrefix, ClsType); 2805 break; 2806 } 2807 } else { 2808 S.Diag(DeclType.Mem.Scope().getBeginLoc(), 2809 diag::err_illegal_decl_mempointer_in_nonclass) 2810 << (D.getIdentifier() ? D.getIdentifier()->getName() : "type name") 2811 << DeclType.Mem.Scope().getRange(); 2812 D.setInvalidType(true); 2813 } 2814 2815 if (!ClsType.isNull()) 2816 T = S.BuildMemberPointerType(T, ClsType, DeclType.Loc, D.getIdentifier()); 2817 if (T.isNull()) { 2818 T = Context.IntTy; 2819 D.setInvalidType(true); 2820 } else if (DeclType.Mem.TypeQuals) { 2821 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Mem.TypeQuals); 2822 } 2823 break; 2824 } 2825 2826 if (T.isNull()) { 2827 D.setInvalidType(true); 2828 T = Context.IntTy; 2829 } 2830 2831 // See if there are any attributes on this declarator chunk. 2832 if (AttributeList *attrs = const_cast<AttributeList*>(DeclType.getAttrs())) 2833 processTypeAttrs(state, T, TAL_DeclChunk, attrs); 2834 } 2835 2836 if (LangOpts.CPlusPlus && T->isFunctionType()) { 2837 const FunctionProtoType *FnTy = T->getAs<FunctionProtoType>(); 2838 assert(FnTy && "Why oh why is there not a FunctionProtoType here?"); 2839 2840 // C++ 8.3.5p4: 2841 // A cv-qualifier-seq shall only be part of the function type 2842 // for a nonstatic member function, the function type to which a pointer 2843 // to member refers, or the top-level function type of a function typedef 2844 // declaration. 2845 // 2846 // Core issue 547 also allows cv-qualifiers on function types that are 2847 // top-level template type arguments. 2848 bool FreeFunction; 2849 if (!D.getCXXScopeSpec().isSet()) { 2850 FreeFunction = ((D.getContext() != Declarator::MemberContext && 2851 D.getContext() != Declarator::LambdaExprContext) || 2852 D.getDeclSpec().isFriendSpecified()); 2853 } else { 2854 DeclContext *DC = S.computeDeclContext(D.getCXXScopeSpec()); 2855 FreeFunction = (DC && !DC->isRecord()); 2856 } 2857 2858 // C++11 [dcl.fct]p6 (w/DR1417): 2859 // An attempt to specify a function type with a cv-qualifier-seq or a 2860 // ref-qualifier (including by typedef-name) is ill-formed unless it is: 2861 // - the function type for a non-static member function, 2862 // - the function type to which a pointer to member refers, 2863 // - the top-level function type of a function typedef declaration or 2864 // alias-declaration, 2865 // - the type-id in the default argument of a type-parameter, or 2866 // - the type-id of a template-argument for a type-parameter 2867 if (IsQualifiedFunction && 2868 !(!FreeFunction && 2869 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) && 2870 !IsTypedefName && 2871 D.getContext() != Declarator::TemplateTypeArgContext) { 2872 SourceLocation Loc = D.getLocStart(); 2873 SourceRange RemovalRange; 2874 unsigned I; 2875 if (D.isFunctionDeclarator(I)) { 2876 SmallVector<SourceLocation, 4> RemovalLocs; 2877 const DeclaratorChunk &Chunk = D.getTypeObject(I); 2878 assert(Chunk.Kind == DeclaratorChunk::Function); 2879 if (Chunk.Fun.hasRefQualifier()) 2880 RemovalLocs.push_back(Chunk.Fun.getRefQualifierLoc()); 2881 if (Chunk.Fun.TypeQuals & Qualifiers::Const) 2882 RemovalLocs.push_back(Chunk.Fun.getConstQualifierLoc()); 2883 if (Chunk.Fun.TypeQuals & Qualifiers::Volatile) 2884 RemovalLocs.push_back(Chunk.Fun.getVolatileQualifierLoc()); 2885 // FIXME: We do not track the location of the __restrict qualifier. 2886 //if (Chunk.Fun.TypeQuals & Qualifiers::Restrict) 2887 // RemovalLocs.push_back(Chunk.Fun.getRestrictQualifierLoc()); 2888 if (!RemovalLocs.empty()) { 2889 std::sort(RemovalLocs.begin(), RemovalLocs.end(), 2890 BeforeThanCompare<SourceLocation>(S.getSourceManager())); 2891 RemovalRange = SourceRange(RemovalLocs.front(), RemovalLocs.back()); 2892 Loc = RemovalLocs.front(); 2893 } 2894 } 2895 2896 S.Diag(Loc, diag::err_invalid_qualified_function_type) 2897 << FreeFunction << D.isFunctionDeclarator() << T 2898 << getFunctionQualifiersAsString(FnTy) 2899 << FixItHint::CreateRemoval(RemovalRange); 2900 2901 // Strip the cv-qualifiers and ref-qualifiers from the type. 2902 FunctionProtoType::ExtProtoInfo EPI = FnTy->getExtProtoInfo(); 2903 EPI.TypeQuals = 0; 2904 EPI.RefQualifier = RQ_None; 2905 2906 T = Context.getFunctionType(FnTy->getResultType(), 2907 ArrayRef<QualType>(FnTy->arg_type_begin(), 2908 FnTy->getNumArgs()), 2909 EPI); 2910 // Rebuild any parens around the identifier in the function type. 2911 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 2912 if (D.getTypeObject(i).Kind != DeclaratorChunk::Paren) 2913 break; 2914 T = S.BuildParenType(T); 2915 } 2916 } 2917 } 2918 2919 // Apply any undistributed attributes from the declarator. 2920 if (!T.isNull()) 2921 if (AttributeList *attrs = D.getAttributes()) 2922 processTypeAttrs(state, T, TAL_DeclName, attrs); 2923 2924 // Diagnose any ignored type attributes. 2925 if (!T.isNull()) state.diagnoseIgnoredTypeAttrs(T); 2926 2927 // C++0x [dcl.constexpr]p9: 2928 // A constexpr specifier used in an object declaration declares the object 2929 // as const. 2930 if (D.getDeclSpec().isConstexprSpecified() && T->isObjectType()) { 2931 T.addConst(); 2932 } 2933 2934 // If there was an ellipsis in the declarator, the declaration declares a 2935 // parameter pack whose type may be a pack expansion type. 2936 if (D.hasEllipsis() && !T.isNull()) { 2937 // C++0x [dcl.fct]p13: 2938 // A declarator-id or abstract-declarator containing an ellipsis shall 2939 // only be used in a parameter-declaration. Such a parameter-declaration 2940 // is a parameter pack (14.5.3). [...] 2941 switch (D.getContext()) { 2942 case Declarator::PrototypeContext: 2943 // C++0x [dcl.fct]p13: 2944 // [...] When it is part of a parameter-declaration-clause, the 2945 // parameter pack is a function parameter pack (14.5.3). The type T 2946 // of the declarator-id of the function parameter pack shall contain 2947 // a template parameter pack; each template parameter pack in T is 2948 // expanded by the function parameter pack. 2949 // 2950 // We represent function parameter packs as function parameters whose 2951 // type is a pack expansion. 2952 if (!T->containsUnexpandedParameterPack()) { 2953 S.Diag(D.getEllipsisLoc(), 2954 diag::err_function_parameter_pack_without_parameter_packs) 2955 << T << D.getSourceRange(); 2956 D.setEllipsisLoc(SourceLocation()); 2957 } else { 2958 T = Context.getPackExpansionType(T, None); 2959 } 2960 break; 2961 2962 case Declarator::TemplateParamContext: 2963 // C++0x [temp.param]p15: 2964 // If a template-parameter is a [...] is a parameter-declaration that 2965 // declares a parameter pack (8.3.5), then the template-parameter is a 2966 // template parameter pack (14.5.3). 2967 // 2968 // Note: core issue 778 clarifies that, if there are any unexpanded 2969 // parameter packs in the type of the non-type template parameter, then 2970 // it expands those parameter packs. 2971 if (T->containsUnexpandedParameterPack()) 2972 T = Context.getPackExpansionType(T, None); 2973 else 2974 S.Diag(D.getEllipsisLoc(), 2975 LangOpts.CPlusPlus11 2976 ? diag::warn_cxx98_compat_variadic_templates 2977 : diag::ext_variadic_templates); 2978 break; 2979 2980 case Declarator::FileContext: 2981 case Declarator::KNRTypeListContext: 2982 case Declarator::ObjCParameterContext: // FIXME: special diagnostic here? 2983 case Declarator::ObjCResultContext: // FIXME: special diagnostic here? 2984 case Declarator::TypeNameContext: 2985 case Declarator::CXXNewContext: 2986 case Declarator::AliasDeclContext: 2987 case Declarator::AliasTemplateContext: 2988 case Declarator::MemberContext: 2989 case Declarator::BlockContext: 2990 case Declarator::ForContext: 2991 case Declarator::ConditionContext: 2992 case Declarator::CXXCatchContext: 2993 case Declarator::ObjCCatchContext: 2994 case Declarator::BlockLiteralContext: 2995 case Declarator::LambdaExprContext: 2996 case Declarator::TrailingReturnContext: 2997 case Declarator::TemplateTypeArgContext: 2998 // FIXME: We may want to allow parameter packs in block-literal contexts 2999 // in the future. 3000 S.Diag(D.getEllipsisLoc(), diag::err_ellipsis_in_declarator_not_parameter); 3001 D.setEllipsisLoc(SourceLocation()); 3002 break; 3003 } 3004 } 3005 3006 if (T.isNull()) 3007 return Context.getNullTypeSourceInfo(); 3008 else if (D.isInvalidType()) 3009 return Context.getTrivialTypeSourceInfo(T); 3010 3011 return S.GetTypeSourceInfoForDeclarator(D, T, TInfo); 3012} 3013 3014/// GetTypeForDeclarator - Convert the type for the specified 3015/// declarator to Type instances. 3016/// 3017/// The result of this call will never be null, but the associated 3018/// type may be a null type if there's an unrecoverable error. 3019TypeSourceInfo *Sema::GetTypeForDeclarator(Declarator &D, Scope *S) { 3020 // Determine the type of the declarator. Not all forms of declarator 3021 // have a type. 3022 3023 TypeProcessingState state(*this, D); 3024 3025 TypeSourceInfo *ReturnTypeInfo = 0; 3026 QualType T = GetDeclSpecTypeForDeclarator(state, ReturnTypeInfo); 3027 if (T.isNull()) 3028 return Context.getNullTypeSourceInfo(); 3029 3030 if (D.isPrototypeContext() && getLangOpts().ObjCAutoRefCount) 3031 inferARCWriteback(state, T); 3032 3033 return GetFullTypeForDeclarator(state, T, ReturnTypeInfo); 3034} 3035 3036static void transferARCOwnershipToDeclSpec(Sema &S, 3037 QualType &declSpecTy, 3038 Qualifiers::ObjCLifetime ownership) { 3039 if (declSpecTy->isObjCRetainableType() && 3040 declSpecTy.getObjCLifetime() == Qualifiers::OCL_None) { 3041 Qualifiers qs; 3042 qs.addObjCLifetime(ownership); 3043 declSpecTy = S.Context.getQualifiedType(declSpecTy, qs); 3044 } 3045} 3046 3047static void transferARCOwnershipToDeclaratorChunk(TypeProcessingState &state, 3048 Qualifiers::ObjCLifetime ownership, 3049 unsigned chunkIndex) { 3050 Sema &S = state.getSema(); 3051 Declarator &D = state.getDeclarator(); 3052 3053 // Look for an explicit lifetime attribute. 3054 DeclaratorChunk &chunk = D.getTypeObject(chunkIndex); 3055 for (const AttributeList *attr = chunk.getAttrs(); attr; 3056 attr = attr->getNext()) 3057 if (attr->getKind() == AttributeList::AT_ObjCOwnership) 3058 return; 3059 3060 const char *attrStr = 0; 3061 switch (ownership) { 3062 case Qualifiers::OCL_None: llvm_unreachable("no ownership!"); 3063 case Qualifiers::OCL_ExplicitNone: attrStr = "none"; break; 3064 case Qualifiers::OCL_Strong: attrStr = "strong"; break; 3065 case Qualifiers::OCL_Weak: attrStr = "weak"; break; 3066 case Qualifiers::OCL_Autoreleasing: attrStr = "autoreleasing"; break; 3067 } 3068 3069 // If there wasn't one, add one (with an invalid source location 3070 // so that we don't make an AttributedType for it). 3071 AttributeList *attr = D.getAttributePool() 3072 .create(&S.Context.Idents.get("objc_ownership"), SourceLocation(), 3073 /*scope*/ 0, SourceLocation(), 3074 &S.Context.Idents.get(attrStr), SourceLocation(), 3075 /*args*/ 0, 0, AttributeList::AS_GNU); 3076 spliceAttrIntoList(*attr, chunk.getAttrListRef()); 3077 3078 // TODO: mark whether we did this inference? 3079} 3080 3081/// \brief Used for transferring ownership in casts resulting in l-values. 3082static void transferARCOwnership(TypeProcessingState &state, 3083 QualType &declSpecTy, 3084 Qualifiers::ObjCLifetime ownership) { 3085 Sema &S = state.getSema(); 3086 Declarator &D = state.getDeclarator(); 3087 3088 int inner = -1; 3089 bool hasIndirection = false; 3090 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 3091 DeclaratorChunk &chunk = D.getTypeObject(i); 3092 switch (chunk.Kind) { 3093 case DeclaratorChunk::Paren: 3094 // Ignore parens. 3095 break; 3096 3097 case DeclaratorChunk::Array: 3098 case DeclaratorChunk::Reference: 3099 case DeclaratorChunk::Pointer: 3100 if (inner != -1) 3101 hasIndirection = true; 3102 inner = i; 3103 break; 3104 3105 case DeclaratorChunk::BlockPointer: 3106 if (inner != -1) 3107 transferARCOwnershipToDeclaratorChunk(state, ownership, i); 3108 return; 3109 3110 case DeclaratorChunk::Function: 3111 case DeclaratorChunk::MemberPointer: 3112 return; 3113 } 3114 } 3115 3116 if (inner == -1) 3117 return; 3118 3119 DeclaratorChunk &chunk = D.getTypeObject(inner); 3120 if (chunk.Kind == DeclaratorChunk::Pointer) { 3121 if (declSpecTy->isObjCRetainableType()) 3122 return transferARCOwnershipToDeclSpec(S, declSpecTy, ownership); 3123 if (declSpecTy->isObjCObjectType() && hasIndirection) 3124 return transferARCOwnershipToDeclaratorChunk(state, ownership, inner); 3125 } else { 3126 assert(chunk.Kind == DeclaratorChunk::Array || 3127 chunk.Kind == DeclaratorChunk::Reference); 3128 return transferARCOwnershipToDeclSpec(S, declSpecTy, ownership); 3129 } 3130} 3131 3132TypeSourceInfo *Sema::GetTypeForDeclaratorCast(Declarator &D, QualType FromTy) { 3133 TypeProcessingState state(*this, D); 3134 3135 TypeSourceInfo *ReturnTypeInfo = 0; 3136 QualType declSpecTy = GetDeclSpecTypeForDeclarator(state, ReturnTypeInfo); 3137 if (declSpecTy.isNull()) 3138 return Context.getNullTypeSourceInfo(); 3139 3140 if (getLangOpts().ObjCAutoRefCount) { 3141 Qualifiers::ObjCLifetime ownership = Context.getInnerObjCOwnership(FromTy); 3142 if (ownership != Qualifiers::OCL_None) 3143 transferARCOwnership(state, declSpecTy, ownership); 3144 } 3145 3146 return GetFullTypeForDeclarator(state, declSpecTy, ReturnTypeInfo); 3147} 3148 3149/// Map an AttributedType::Kind to an AttributeList::Kind. 3150static AttributeList::Kind getAttrListKind(AttributedType::Kind kind) { 3151 switch (kind) { 3152 case AttributedType::attr_address_space: 3153 return AttributeList::AT_AddressSpace; 3154 case AttributedType::attr_regparm: 3155 return AttributeList::AT_Regparm; 3156 case AttributedType::attr_vector_size: 3157 return AttributeList::AT_VectorSize; 3158 case AttributedType::attr_neon_vector_type: 3159 return AttributeList::AT_NeonVectorType; 3160 case AttributedType::attr_neon_polyvector_type: 3161 return AttributeList::AT_NeonPolyVectorType; 3162 case AttributedType::attr_objc_gc: 3163 return AttributeList::AT_ObjCGC; 3164 case AttributedType::attr_objc_ownership: 3165 return AttributeList::AT_ObjCOwnership; 3166 case AttributedType::attr_noreturn: 3167 return AttributeList::AT_NoReturn; 3168 case AttributedType::attr_cdecl: 3169 return AttributeList::AT_CDecl; 3170 case AttributedType::attr_fastcall: 3171 return AttributeList::AT_FastCall; 3172 case AttributedType::attr_stdcall: 3173 return AttributeList::AT_StdCall; 3174 case AttributedType::attr_thiscall: 3175 return AttributeList::AT_ThisCall; 3176 case AttributedType::attr_pascal: 3177 return AttributeList::AT_Pascal; 3178 case AttributedType::attr_pcs: 3179 return AttributeList::AT_Pcs; 3180 case AttributedType::attr_pnaclcall: 3181 return AttributeList::AT_PnaclCall; 3182 case AttributedType::attr_inteloclbicc: 3183 return AttributeList::AT_IntelOclBicc; 3184 } 3185 llvm_unreachable("unexpected attribute kind!"); 3186} 3187 3188static void fillAttributedTypeLoc(AttributedTypeLoc TL, 3189 const AttributeList *attrs) { 3190 AttributedType::Kind kind = TL.getAttrKind(); 3191 3192 assert(attrs && "no type attributes in the expected location!"); 3193 AttributeList::Kind parsedKind = getAttrListKind(kind); 3194 while (attrs->getKind() != parsedKind) { 3195 attrs = attrs->getNext(); 3196 assert(attrs && "no matching attribute in expected location!"); 3197 } 3198 3199 TL.setAttrNameLoc(attrs->getLoc()); 3200 if (TL.hasAttrExprOperand()) 3201 TL.setAttrExprOperand(attrs->getArg(0)); 3202 else if (TL.hasAttrEnumOperand()) 3203 TL.setAttrEnumOperandLoc(attrs->getParameterLoc()); 3204 3205 // FIXME: preserve this information to here. 3206 if (TL.hasAttrOperand()) 3207 TL.setAttrOperandParensRange(SourceRange()); 3208} 3209 3210namespace { 3211 class TypeSpecLocFiller : public TypeLocVisitor<TypeSpecLocFiller> { 3212 ASTContext &Context; 3213 const DeclSpec &DS; 3214 3215 public: 3216 TypeSpecLocFiller(ASTContext &Context, const DeclSpec &DS) 3217 : Context(Context), DS(DS) {} 3218 3219 void VisitAttributedTypeLoc(AttributedTypeLoc TL) { 3220 fillAttributedTypeLoc(TL, DS.getAttributes().getList()); 3221 Visit(TL.getModifiedLoc()); 3222 } 3223 void VisitQualifiedTypeLoc(QualifiedTypeLoc TL) { 3224 Visit(TL.getUnqualifiedLoc()); 3225 } 3226 void VisitTypedefTypeLoc(TypedefTypeLoc TL) { 3227 TL.setNameLoc(DS.getTypeSpecTypeLoc()); 3228 } 3229 void VisitObjCInterfaceTypeLoc(ObjCInterfaceTypeLoc TL) { 3230 TL.setNameLoc(DS.getTypeSpecTypeLoc()); 3231 // FIXME. We should have DS.getTypeSpecTypeEndLoc(). But, it requires 3232 // addition field. What we have is good enough for dispay of location 3233 // of 'fixit' on interface name. 3234 TL.setNameEndLoc(DS.getLocEnd()); 3235 } 3236 void VisitObjCObjectTypeLoc(ObjCObjectTypeLoc TL) { 3237 // Handle the base type, which might not have been written explicitly. 3238 if (DS.getTypeSpecType() == DeclSpec::TST_unspecified) { 3239 TL.setHasBaseTypeAsWritten(false); 3240 TL.getBaseLoc().initialize(Context, SourceLocation()); 3241 } else { 3242 TL.setHasBaseTypeAsWritten(true); 3243 Visit(TL.getBaseLoc()); 3244 } 3245 3246 // Protocol qualifiers. 3247 if (DS.getProtocolQualifiers()) { 3248 assert(TL.getNumProtocols() > 0); 3249 assert(TL.getNumProtocols() == DS.getNumProtocolQualifiers()); 3250 TL.setLAngleLoc(DS.getProtocolLAngleLoc()); 3251 TL.setRAngleLoc(DS.getSourceRange().getEnd()); 3252 for (unsigned i = 0, e = DS.getNumProtocolQualifiers(); i != e; ++i) 3253 TL.setProtocolLoc(i, DS.getProtocolLocs()[i]); 3254 } else { 3255 assert(TL.getNumProtocols() == 0); 3256 TL.setLAngleLoc(SourceLocation()); 3257 TL.setRAngleLoc(SourceLocation()); 3258 } 3259 } 3260 void VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL) { 3261 TL.setStarLoc(SourceLocation()); 3262 Visit(TL.getPointeeLoc()); 3263 } 3264 void VisitTemplateSpecializationTypeLoc(TemplateSpecializationTypeLoc TL) { 3265 TypeSourceInfo *TInfo = 0; 3266 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 3267 3268 // If we got no declarator info from previous Sema routines, 3269 // just fill with the typespec loc. 3270 if (!TInfo) { 3271 TL.initialize(Context, DS.getTypeSpecTypeNameLoc()); 3272 return; 3273 } 3274 3275 TypeLoc OldTL = TInfo->getTypeLoc(); 3276 if (TInfo->getType()->getAs<ElaboratedType>()) { 3277 ElaboratedTypeLoc ElabTL = OldTL.castAs<ElaboratedTypeLoc>(); 3278 TemplateSpecializationTypeLoc NamedTL = ElabTL.getNamedTypeLoc() 3279 .castAs<TemplateSpecializationTypeLoc>(); 3280 TL.copy(NamedTL); 3281 } 3282 else 3283 TL.copy(OldTL.castAs<TemplateSpecializationTypeLoc>()); 3284 } 3285 void VisitTypeOfExprTypeLoc(TypeOfExprTypeLoc TL) { 3286 assert(DS.getTypeSpecType() == DeclSpec::TST_typeofExpr); 3287 TL.setTypeofLoc(DS.getTypeSpecTypeLoc()); 3288 TL.setParensRange(DS.getTypeofParensRange()); 3289 } 3290 void VisitTypeOfTypeLoc(TypeOfTypeLoc TL) { 3291 assert(DS.getTypeSpecType() == DeclSpec::TST_typeofType); 3292 TL.setTypeofLoc(DS.getTypeSpecTypeLoc()); 3293 TL.setParensRange(DS.getTypeofParensRange()); 3294 assert(DS.getRepAsType()); 3295 TypeSourceInfo *TInfo = 0; 3296 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 3297 TL.setUnderlyingTInfo(TInfo); 3298 } 3299 void VisitUnaryTransformTypeLoc(UnaryTransformTypeLoc TL) { 3300 // FIXME: This holds only because we only have one unary transform. 3301 assert(DS.getTypeSpecType() == DeclSpec::TST_underlyingType); 3302 TL.setKWLoc(DS.getTypeSpecTypeLoc()); 3303 TL.setParensRange(DS.getTypeofParensRange()); 3304 assert(DS.getRepAsType()); 3305 TypeSourceInfo *TInfo = 0; 3306 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 3307 TL.setUnderlyingTInfo(TInfo); 3308 } 3309 void VisitBuiltinTypeLoc(BuiltinTypeLoc TL) { 3310 // By default, use the source location of the type specifier. 3311 TL.setBuiltinLoc(DS.getTypeSpecTypeLoc()); 3312 if (TL.needsExtraLocalData()) { 3313 // Set info for the written builtin specifiers. 3314 TL.getWrittenBuiltinSpecs() = DS.getWrittenBuiltinSpecs(); 3315 // Try to have a meaningful source location. 3316 if (TL.getWrittenSignSpec() != TSS_unspecified) 3317 // Sign spec loc overrides the others (e.g., 'unsigned long'). 3318 TL.setBuiltinLoc(DS.getTypeSpecSignLoc()); 3319 else if (TL.getWrittenWidthSpec() != TSW_unspecified) 3320 // Width spec loc overrides type spec loc (e.g., 'short int'). 3321 TL.setBuiltinLoc(DS.getTypeSpecWidthLoc()); 3322 } 3323 } 3324 void VisitElaboratedTypeLoc(ElaboratedTypeLoc TL) { 3325 ElaboratedTypeKeyword Keyword 3326 = TypeWithKeyword::getKeywordForTypeSpec(DS.getTypeSpecType()); 3327 if (DS.getTypeSpecType() == TST_typename) { 3328 TypeSourceInfo *TInfo = 0; 3329 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 3330 if (TInfo) { 3331 TL.copy(TInfo->getTypeLoc().castAs<ElaboratedTypeLoc>()); 3332 return; 3333 } 3334 } 3335 TL.setElaboratedKeywordLoc(Keyword != ETK_None 3336 ? DS.getTypeSpecTypeLoc() 3337 : SourceLocation()); 3338 const CXXScopeSpec& SS = DS.getTypeSpecScope(); 3339 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 3340 Visit(TL.getNextTypeLoc().getUnqualifiedLoc()); 3341 } 3342 void VisitDependentNameTypeLoc(DependentNameTypeLoc TL) { 3343 assert(DS.getTypeSpecType() == TST_typename); 3344 TypeSourceInfo *TInfo = 0; 3345 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 3346 assert(TInfo); 3347 TL.copy(TInfo->getTypeLoc().castAs<DependentNameTypeLoc>()); 3348 } 3349 void VisitDependentTemplateSpecializationTypeLoc( 3350 DependentTemplateSpecializationTypeLoc TL) { 3351 assert(DS.getTypeSpecType() == TST_typename); 3352 TypeSourceInfo *TInfo = 0; 3353 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 3354 assert(TInfo); 3355 TL.copy( 3356 TInfo->getTypeLoc().castAs<DependentTemplateSpecializationTypeLoc>()); 3357 } 3358 void VisitTagTypeLoc(TagTypeLoc TL) { 3359 TL.setNameLoc(DS.getTypeSpecTypeNameLoc()); 3360 } 3361 void VisitAtomicTypeLoc(AtomicTypeLoc TL) { 3362 // An AtomicTypeLoc can come from either an _Atomic(...) type specifier 3363 // or an _Atomic qualifier. 3364 if (DS.getTypeSpecType() == DeclSpec::TST_atomic) { 3365 TL.setKWLoc(DS.getTypeSpecTypeLoc()); 3366 TL.setParensRange(DS.getTypeofParensRange()); 3367 3368 TypeSourceInfo *TInfo = 0; 3369 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 3370 assert(TInfo); 3371 TL.getValueLoc().initializeFullCopy(TInfo->getTypeLoc()); 3372 } else { 3373 TL.setKWLoc(DS.getAtomicSpecLoc()); 3374 // No parens, to indicate this was spelled as an _Atomic qualifier. 3375 TL.setParensRange(SourceRange()); 3376 Visit(TL.getValueLoc()); 3377 } 3378 } 3379 3380 void VisitTypeLoc(TypeLoc TL) { 3381 // FIXME: add other typespec types and change this to an assert. 3382 TL.initialize(Context, DS.getTypeSpecTypeLoc()); 3383 } 3384 }; 3385 3386 class DeclaratorLocFiller : public TypeLocVisitor<DeclaratorLocFiller> { 3387 ASTContext &Context; 3388 const DeclaratorChunk &Chunk; 3389 3390 public: 3391 DeclaratorLocFiller(ASTContext &Context, const DeclaratorChunk &Chunk) 3392 : Context(Context), Chunk(Chunk) {} 3393 3394 void VisitQualifiedTypeLoc(QualifiedTypeLoc TL) { 3395 llvm_unreachable("qualified type locs not expected here!"); 3396 } 3397 3398 void VisitAttributedTypeLoc(AttributedTypeLoc TL) { 3399 fillAttributedTypeLoc(TL, Chunk.getAttrs()); 3400 } 3401 void VisitBlockPointerTypeLoc(BlockPointerTypeLoc TL) { 3402 assert(Chunk.Kind == DeclaratorChunk::BlockPointer); 3403 TL.setCaretLoc(Chunk.Loc); 3404 } 3405 void VisitPointerTypeLoc(PointerTypeLoc TL) { 3406 assert(Chunk.Kind == DeclaratorChunk::Pointer); 3407 TL.setStarLoc(Chunk.Loc); 3408 } 3409 void VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL) { 3410 assert(Chunk.Kind == DeclaratorChunk::Pointer); 3411 TL.setStarLoc(Chunk.Loc); 3412 } 3413 void VisitMemberPointerTypeLoc(MemberPointerTypeLoc TL) { 3414 assert(Chunk.Kind == DeclaratorChunk::MemberPointer); 3415 const CXXScopeSpec& SS = Chunk.Mem.Scope(); 3416 NestedNameSpecifierLoc NNSLoc = SS.getWithLocInContext(Context); 3417 3418 const Type* ClsTy = TL.getClass(); 3419 QualType ClsQT = QualType(ClsTy, 0); 3420 TypeSourceInfo *ClsTInfo = Context.CreateTypeSourceInfo(ClsQT, 0); 3421 // Now copy source location info into the type loc component. 3422 TypeLoc ClsTL = ClsTInfo->getTypeLoc(); 3423 switch (NNSLoc.getNestedNameSpecifier()->getKind()) { 3424 case NestedNameSpecifier::Identifier: 3425 assert(isa<DependentNameType>(ClsTy) && "Unexpected TypeLoc"); 3426 { 3427 DependentNameTypeLoc DNTLoc = ClsTL.castAs<DependentNameTypeLoc>(); 3428 DNTLoc.setElaboratedKeywordLoc(SourceLocation()); 3429 DNTLoc.setQualifierLoc(NNSLoc.getPrefix()); 3430 DNTLoc.setNameLoc(NNSLoc.getLocalBeginLoc()); 3431 } 3432 break; 3433 3434 case NestedNameSpecifier::TypeSpec: 3435 case NestedNameSpecifier::TypeSpecWithTemplate: 3436 if (isa<ElaboratedType>(ClsTy)) { 3437 ElaboratedTypeLoc ETLoc = ClsTL.castAs<ElaboratedTypeLoc>(); 3438 ETLoc.setElaboratedKeywordLoc(SourceLocation()); 3439 ETLoc.setQualifierLoc(NNSLoc.getPrefix()); 3440 TypeLoc NamedTL = ETLoc.getNamedTypeLoc(); 3441 NamedTL.initializeFullCopy(NNSLoc.getTypeLoc()); 3442 } else { 3443 ClsTL.initializeFullCopy(NNSLoc.getTypeLoc()); 3444 } 3445 break; 3446 3447 case NestedNameSpecifier::Namespace: 3448 case NestedNameSpecifier::NamespaceAlias: 3449 case NestedNameSpecifier::Global: 3450 llvm_unreachable("Nested-name-specifier must name a type"); 3451 } 3452 3453 // Finally fill in MemberPointerLocInfo fields. 3454 TL.setStarLoc(Chunk.Loc); 3455 TL.setClassTInfo(ClsTInfo); 3456 } 3457 void VisitLValueReferenceTypeLoc(LValueReferenceTypeLoc TL) { 3458 assert(Chunk.Kind == DeclaratorChunk::Reference); 3459 // 'Amp' is misleading: this might have been originally 3460 /// spelled with AmpAmp. 3461 TL.setAmpLoc(Chunk.Loc); 3462 } 3463 void VisitRValueReferenceTypeLoc(RValueReferenceTypeLoc TL) { 3464 assert(Chunk.Kind == DeclaratorChunk::Reference); 3465 assert(!Chunk.Ref.LValueRef); 3466 TL.setAmpAmpLoc(Chunk.Loc); 3467 } 3468 void VisitArrayTypeLoc(ArrayTypeLoc TL) { 3469 assert(Chunk.Kind == DeclaratorChunk::Array); 3470 TL.setLBracketLoc(Chunk.Loc); 3471 TL.setRBracketLoc(Chunk.EndLoc); 3472 TL.setSizeExpr(static_cast<Expr*>(Chunk.Arr.NumElts)); 3473 } 3474 void VisitFunctionTypeLoc(FunctionTypeLoc TL) { 3475 assert(Chunk.Kind == DeclaratorChunk::Function); 3476 TL.setLocalRangeBegin(Chunk.Loc); 3477 TL.setLocalRangeEnd(Chunk.EndLoc); 3478 3479 const DeclaratorChunk::FunctionTypeInfo &FTI = Chunk.Fun; 3480 TL.setLParenLoc(FTI.getLParenLoc()); 3481 TL.setRParenLoc(FTI.getRParenLoc()); 3482 for (unsigned i = 0, e = TL.getNumArgs(), tpi = 0; i != e; ++i) { 3483 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 3484 TL.setArg(tpi++, Param); 3485 } 3486 // FIXME: exception specs 3487 } 3488 void VisitParenTypeLoc(ParenTypeLoc TL) { 3489 assert(Chunk.Kind == DeclaratorChunk::Paren); 3490 TL.setLParenLoc(Chunk.Loc); 3491 TL.setRParenLoc(Chunk.EndLoc); 3492 } 3493 3494 void VisitTypeLoc(TypeLoc TL) { 3495 llvm_unreachable("unsupported TypeLoc kind in declarator!"); 3496 } 3497 }; 3498} 3499 3500static void fillAtomicQualLoc(AtomicTypeLoc ATL, const DeclaratorChunk &Chunk) { 3501 SourceLocation Loc; 3502 switch (Chunk.Kind) { 3503 case DeclaratorChunk::Function: 3504 case DeclaratorChunk::Array: 3505 case DeclaratorChunk::Paren: 3506 llvm_unreachable("cannot be _Atomic qualified"); 3507 3508 case DeclaratorChunk::Pointer: 3509 Loc = SourceLocation::getFromRawEncoding(Chunk.Ptr.AtomicQualLoc); 3510 break; 3511 3512 case DeclaratorChunk::BlockPointer: 3513 case DeclaratorChunk::Reference: 3514 case DeclaratorChunk::MemberPointer: 3515 // FIXME: Provide a source location for the _Atomic keyword. 3516 break; 3517 } 3518 3519 ATL.setKWLoc(Loc); 3520 ATL.setParensRange(SourceRange()); 3521} 3522 3523/// \brief Create and instantiate a TypeSourceInfo with type source information. 3524/// 3525/// \param T QualType referring to the type as written in source code. 3526/// 3527/// \param ReturnTypeInfo For declarators whose return type does not show 3528/// up in the normal place in the declaration specifiers (such as a C++ 3529/// conversion function), this pointer will refer to a type source information 3530/// for that return type. 3531TypeSourceInfo * 3532Sema::GetTypeSourceInfoForDeclarator(Declarator &D, QualType T, 3533 TypeSourceInfo *ReturnTypeInfo) { 3534 TypeSourceInfo *TInfo = Context.CreateTypeSourceInfo(T); 3535 UnqualTypeLoc CurrTL = TInfo->getTypeLoc().getUnqualifiedLoc(); 3536 3537 // Handle parameter packs whose type is a pack expansion. 3538 if (isa<PackExpansionType>(T)) { 3539 CurrTL.castAs<PackExpansionTypeLoc>().setEllipsisLoc(D.getEllipsisLoc()); 3540 CurrTL = CurrTL.getNextTypeLoc().getUnqualifiedLoc(); 3541 } 3542 3543 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 3544 // An AtomicTypeLoc might be produced by an atomic qualifier in this 3545 // declarator chunk. 3546 // FIXME: Relative order of this and attributed type loc? 3547 if (AtomicTypeLoc ATL = CurrTL.getAs<AtomicTypeLoc>()) { 3548 fillAtomicQualLoc(ATL, D.getTypeObject(i)); 3549 CurrTL = ATL.getValueLoc().getUnqualifiedLoc(); 3550 } 3551 3552 while (AttributedTypeLoc TL = CurrTL.getAs<AttributedTypeLoc>()) { 3553 fillAttributedTypeLoc(TL, D.getTypeObject(i).getAttrs()); 3554 CurrTL = TL.getNextTypeLoc().getUnqualifiedLoc(); 3555 } 3556 3557 DeclaratorLocFiller(Context, D.getTypeObject(i)).Visit(CurrTL); 3558 CurrTL = CurrTL.getNextTypeLoc().getUnqualifiedLoc(); 3559 } 3560 3561 // If we have different source information for the return type, use 3562 // that. This really only applies to C++ conversion functions. 3563 if (ReturnTypeInfo) { 3564 TypeLoc TL = ReturnTypeInfo->getTypeLoc(); 3565 assert(TL.getFullDataSize() == CurrTL.getFullDataSize()); 3566 memcpy(CurrTL.getOpaqueData(), TL.getOpaqueData(), TL.getFullDataSize()); 3567 } else { 3568 TypeSpecLocFiller(Context, D.getDeclSpec()).Visit(CurrTL); 3569 } 3570 3571 return TInfo; 3572} 3573 3574/// \brief Create a LocInfoType to hold the given QualType and TypeSourceInfo. 3575ParsedType Sema::CreateParsedType(QualType T, TypeSourceInfo *TInfo) { 3576 // FIXME: LocInfoTypes are "transient", only needed for passing to/from Parser 3577 // and Sema during declaration parsing. Try deallocating/caching them when 3578 // it's appropriate, instead of allocating them and keeping them around. 3579 LocInfoType *LocT = (LocInfoType*)BumpAlloc.Allocate(sizeof(LocInfoType), 3580 TypeAlignment); 3581 new (LocT) LocInfoType(T, TInfo); 3582 assert(LocT->getTypeClass() != T->getTypeClass() && 3583 "LocInfoType's TypeClass conflicts with an existing Type class"); 3584 return ParsedType::make(QualType(LocT, 0)); 3585} 3586 3587void LocInfoType::getAsStringInternal(std::string &Str, 3588 const PrintingPolicy &Policy) const { 3589 llvm_unreachable("LocInfoType leaked into the type system; an opaque TypeTy*" 3590 " was used directly instead of getting the QualType through" 3591 " GetTypeFromParser"); 3592} 3593 3594TypeResult Sema::ActOnTypeName(Scope *S, Declarator &D) { 3595 // C99 6.7.6: Type names have no identifier. This is already validated by 3596 // the parser. 3597 assert(D.getIdentifier() == 0 && "Type name should have no identifier!"); 3598 3599 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 3600 QualType T = TInfo->getType(); 3601 if (D.isInvalidType()) 3602 return true; 3603 3604 // Make sure there are no unused decl attributes on the declarator. 3605 // We don't want to do this for ObjC parameters because we're going 3606 // to apply them to the actual parameter declaration. 3607 // Likewise, we don't want to do this for alias declarations, because 3608 // we are actually going to build a declaration from this eventually. 3609 if (D.getContext() != Declarator::ObjCParameterContext && 3610 D.getContext() != Declarator::AliasDeclContext && 3611 D.getContext() != Declarator::AliasTemplateContext) 3612 checkUnusedDeclAttributes(D); 3613 3614 if (getLangOpts().CPlusPlus) { 3615 // Check that there are no default arguments (C++ only). 3616 CheckExtraCXXDefaultArguments(D); 3617 } 3618 3619 return CreateParsedType(T, TInfo); 3620} 3621 3622ParsedType Sema::ActOnObjCInstanceType(SourceLocation Loc) { 3623 QualType T = Context.getObjCInstanceType(); 3624 TypeSourceInfo *TInfo = Context.getTrivialTypeSourceInfo(T, Loc); 3625 return CreateParsedType(T, TInfo); 3626} 3627 3628 3629//===----------------------------------------------------------------------===// 3630// Type Attribute Processing 3631//===----------------------------------------------------------------------===// 3632 3633/// HandleAddressSpaceTypeAttribute - Process an address_space attribute on the 3634/// specified type. The attribute contains 1 argument, the id of the address 3635/// space for the type. 3636static void HandleAddressSpaceTypeAttribute(QualType &Type, 3637 const AttributeList &Attr, Sema &S){ 3638 3639 // If this type is already address space qualified, reject it. 3640 // ISO/IEC TR 18037 S5.3 (amending C99 6.7.3): "No type shall be qualified by 3641 // qualifiers for two or more different address spaces." 3642 if (Type.getAddressSpace()) { 3643 S.Diag(Attr.getLoc(), diag::err_attribute_address_multiple_qualifiers); 3644 Attr.setInvalid(); 3645 return; 3646 } 3647 3648 // ISO/IEC TR 18037 S5.3 (amending C99 6.7.3): "A function type shall not be 3649 // qualified by an address-space qualifier." 3650 if (Type->isFunctionType()) { 3651 S.Diag(Attr.getLoc(), diag::err_attribute_address_function_type); 3652 Attr.setInvalid(); 3653 return; 3654 } 3655 3656 // Check the attribute arguments. 3657 if (Attr.getNumArgs() != 1) { 3658 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 3659 Attr.setInvalid(); 3660 return; 3661 } 3662 Expr *ASArgExpr = static_cast<Expr *>(Attr.getArg(0)); 3663 llvm::APSInt addrSpace(32); 3664 if (ASArgExpr->isTypeDependent() || ASArgExpr->isValueDependent() || 3665 !ASArgExpr->isIntegerConstantExpr(addrSpace, S.Context)) { 3666 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_not_int) 3667 << ASArgExpr->getSourceRange(); 3668 Attr.setInvalid(); 3669 return; 3670 } 3671 3672 // Bounds checking. 3673 if (addrSpace.isSigned()) { 3674 if (addrSpace.isNegative()) { 3675 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_negative) 3676 << ASArgExpr->getSourceRange(); 3677 Attr.setInvalid(); 3678 return; 3679 } 3680 addrSpace.setIsSigned(false); 3681 } 3682 llvm::APSInt max(addrSpace.getBitWidth()); 3683 max = Qualifiers::MaxAddressSpace; 3684 if (addrSpace > max) { 3685 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_too_high) 3686 << Qualifiers::MaxAddressSpace << ASArgExpr->getSourceRange(); 3687 Attr.setInvalid(); 3688 return; 3689 } 3690 3691 unsigned ASIdx = static_cast<unsigned>(addrSpace.getZExtValue()); 3692 Type = S.Context.getAddrSpaceQualType(Type, ASIdx); 3693} 3694 3695/// Does this type have a "direct" ownership qualifier? That is, 3696/// is it written like "__strong id", as opposed to something like 3697/// "typeof(foo)", where that happens to be strong? 3698static bool hasDirectOwnershipQualifier(QualType type) { 3699 // Fast path: no qualifier at all. 3700 assert(type.getQualifiers().hasObjCLifetime()); 3701 3702 while (true) { 3703 // __strong id 3704 if (const AttributedType *attr = dyn_cast<AttributedType>(type)) { 3705 if (attr->getAttrKind() == AttributedType::attr_objc_ownership) 3706 return true; 3707 3708 type = attr->getModifiedType(); 3709 3710 // X *__strong (...) 3711 } else if (const ParenType *paren = dyn_cast<ParenType>(type)) { 3712 type = paren->getInnerType(); 3713 3714 // That's it for things we want to complain about. In particular, 3715 // we do not want to look through typedefs, typeof(expr), 3716 // typeof(type), or any other way that the type is somehow 3717 // abstracted. 3718 } else { 3719 3720 return false; 3721 } 3722 } 3723} 3724 3725/// handleObjCOwnershipTypeAttr - Process an objc_ownership 3726/// attribute on the specified type. 3727/// 3728/// Returns 'true' if the attribute was handled. 3729static bool handleObjCOwnershipTypeAttr(TypeProcessingState &state, 3730 AttributeList &attr, 3731 QualType &type) { 3732 bool NonObjCPointer = false; 3733 3734 if (!type->isDependentType()) { 3735 if (const PointerType *ptr = type->getAs<PointerType>()) { 3736 QualType pointee = ptr->getPointeeType(); 3737 if (pointee->isObjCRetainableType() || pointee->isPointerType()) 3738 return false; 3739 // It is important not to lose the source info that there was an attribute 3740 // applied to non-objc pointer. We will create an attributed type but 3741 // its type will be the same as the original type. 3742 NonObjCPointer = true; 3743 } else if (!type->isObjCRetainableType()) { 3744 return false; 3745 } 3746 3747 // Don't accept an ownership attribute in the declspec if it would 3748 // just be the return type of a block pointer. 3749 if (state.isProcessingDeclSpec()) { 3750 Declarator &D = state.getDeclarator(); 3751 if (maybeMovePastReturnType(D, D.getNumTypeObjects())) 3752 return false; 3753 } 3754 } 3755 3756 Sema &S = state.getSema(); 3757 SourceLocation AttrLoc = attr.getLoc(); 3758 if (AttrLoc.isMacroID()) 3759 AttrLoc = S.getSourceManager().getImmediateExpansionRange(AttrLoc).first; 3760 3761 if (!attr.getParameterName()) { 3762 S.Diag(AttrLoc, diag::err_attribute_argument_n_not_string) 3763 << "objc_ownership" << 1; 3764 attr.setInvalid(); 3765 return true; 3766 } 3767 3768 // Consume lifetime attributes without further comment outside of 3769 // ARC mode. 3770 if (!S.getLangOpts().ObjCAutoRefCount) 3771 return true; 3772 3773 Qualifiers::ObjCLifetime lifetime; 3774 if (attr.getParameterName()->isStr("none")) 3775 lifetime = Qualifiers::OCL_ExplicitNone; 3776 else if (attr.getParameterName()->isStr("strong")) 3777 lifetime = Qualifiers::OCL_Strong; 3778 else if (attr.getParameterName()->isStr("weak")) 3779 lifetime = Qualifiers::OCL_Weak; 3780 else if (attr.getParameterName()->isStr("autoreleasing")) 3781 lifetime = Qualifiers::OCL_Autoreleasing; 3782 else { 3783 S.Diag(AttrLoc, diag::warn_attribute_type_not_supported) 3784 << "objc_ownership" << attr.getParameterName(); 3785 attr.setInvalid(); 3786 return true; 3787 } 3788 3789 SplitQualType underlyingType = type.split(); 3790 3791 // Check for redundant/conflicting ownership qualifiers. 3792 if (Qualifiers::ObjCLifetime previousLifetime 3793 = type.getQualifiers().getObjCLifetime()) { 3794 // If it's written directly, that's an error. 3795 if (hasDirectOwnershipQualifier(type)) { 3796 S.Diag(AttrLoc, diag::err_attr_objc_ownership_redundant) 3797 << type; 3798 return true; 3799 } 3800 3801 // Otherwise, if the qualifiers actually conflict, pull sugar off 3802 // until we reach a type that is directly qualified. 3803 if (previousLifetime != lifetime) { 3804 // This should always terminate: the canonical type is 3805 // qualified, so some bit of sugar must be hiding it. 3806 while (!underlyingType.Quals.hasObjCLifetime()) { 3807 underlyingType = underlyingType.getSingleStepDesugaredType(); 3808 } 3809 underlyingType.Quals.removeObjCLifetime(); 3810 } 3811 } 3812 3813 underlyingType.Quals.addObjCLifetime(lifetime); 3814 3815 if (NonObjCPointer) { 3816 StringRef name = attr.getName()->getName(); 3817 switch (lifetime) { 3818 case Qualifiers::OCL_None: 3819 case Qualifiers::OCL_ExplicitNone: 3820 break; 3821 case Qualifiers::OCL_Strong: name = "__strong"; break; 3822 case Qualifiers::OCL_Weak: name = "__weak"; break; 3823 case Qualifiers::OCL_Autoreleasing: name = "__autoreleasing"; break; 3824 } 3825 S.Diag(AttrLoc, diag::warn_objc_object_attribute_wrong_type) 3826 << name << type; 3827 } 3828 3829 QualType origType = type; 3830 if (!NonObjCPointer) 3831 type = S.Context.getQualifiedType(underlyingType); 3832 3833 // If we have a valid source location for the attribute, use an 3834 // AttributedType instead. 3835 if (AttrLoc.isValid()) 3836 type = S.Context.getAttributedType(AttributedType::attr_objc_ownership, 3837 origType, type); 3838 3839 // Forbid __weak if the runtime doesn't support it. 3840 if (lifetime == Qualifiers::OCL_Weak && 3841 !S.getLangOpts().ObjCARCWeak && !NonObjCPointer) { 3842 3843 // Actually, delay this until we know what we're parsing. 3844 if (S.DelayedDiagnostics.shouldDelayDiagnostics()) { 3845 S.DelayedDiagnostics.add( 3846 sema::DelayedDiagnostic::makeForbiddenType( 3847 S.getSourceManager().getExpansionLoc(AttrLoc), 3848 diag::err_arc_weak_no_runtime, type, /*ignored*/ 0)); 3849 } else { 3850 S.Diag(AttrLoc, diag::err_arc_weak_no_runtime); 3851 } 3852 3853 attr.setInvalid(); 3854 return true; 3855 } 3856 3857 // Forbid __weak for class objects marked as 3858 // objc_arc_weak_reference_unavailable 3859 if (lifetime == Qualifiers::OCL_Weak) { 3860 if (const ObjCObjectPointerType *ObjT = 3861 type->getAs<ObjCObjectPointerType>()) { 3862 if (ObjCInterfaceDecl *Class = ObjT->getInterfaceDecl()) { 3863 if (Class->isArcWeakrefUnavailable()) { 3864 S.Diag(AttrLoc, diag::err_arc_unsupported_weak_class); 3865 S.Diag(ObjT->getInterfaceDecl()->getLocation(), 3866 diag::note_class_declared); 3867 } 3868 } 3869 } 3870 } 3871 3872 return true; 3873} 3874 3875/// handleObjCGCTypeAttr - Process the __attribute__((objc_gc)) type 3876/// attribute on the specified type. Returns true to indicate that 3877/// the attribute was handled, false to indicate that the type does 3878/// not permit the attribute. 3879static bool handleObjCGCTypeAttr(TypeProcessingState &state, 3880 AttributeList &attr, 3881 QualType &type) { 3882 Sema &S = state.getSema(); 3883 3884 // Delay if this isn't some kind of pointer. 3885 if (!type->isPointerType() && 3886 !type->isObjCObjectPointerType() && 3887 !type->isBlockPointerType()) 3888 return false; 3889 3890 if (type.getObjCGCAttr() != Qualifiers::GCNone) { 3891 S.Diag(attr.getLoc(), diag::err_attribute_multiple_objc_gc); 3892 attr.setInvalid(); 3893 return true; 3894 } 3895 3896 // Check the attribute arguments. 3897 if (!attr.getParameterName()) { 3898 S.Diag(attr.getLoc(), diag::err_attribute_argument_n_not_string) 3899 << "objc_gc" << 1; 3900 attr.setInvalid(); 3901 return true; 3902 } 3903 Qualifiers::GC GCAttr; 3904 if (attr.getNumArgs() != 0) { 3905 S.Diag(attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 3906 attr.setInvalid(); 3907 return true; 3908 } 3909 if (attr.getParameterName()->isStr("weak")) 3910 GCAttr = Qualifiers::Weak; 3911 else if (attr.getParameterName()->isStr("strong")) 3912 GCAttr = Qualifiers::Strong; 3913 else { 3914 S.Diag(attr.getLoc(), diag::warn_attribute_type_not_supported) 3915 << "objc_gc" << attr.getParameterName(); 3916 attr.setInvalid(); 3917 return true; 3918 } 3919 3920 QualType origType = type; 3921 type = S.Context.getObjCGCQualType(origType, GCAttr); 3922 3923 // Make an attributed type to preserve the source information. 3924 if (attr.getLoc().isValid()) 3925 type = S.Context.getAttributedType(AttributedType::attr_objc_gc, 3926 origType, type); 3927 3928 return true; 3929} 3930 3931namespace { 3932 /// A helper class to unwrap a type down to a function for the 3933 /// purposes of applying attributes there. 3934 /// 3935 /// Use: 3936 /// FunctionTypeUnwrapper unwrapped(SemaRef, T); 3937 /// if (unwrapped.isFunctionType()) { 3938 /// const FunctionType *fn = unwrapped.get(); 3939 /// // change fn somehow 3940 /// T = unwrapped.wrap(fn); 3941 /// } 3942 struct FunctionTypeUnwrapper { 3943 enum WrapKind { 3944 Desugar, 3945 Parens, 3946 Pointer, 3947 BlockPointer, 3948 Reference, 3949 MemberPointer 3950 }; 3951 3952 QualType Original; 3953 const FunctionType *Fn; 3954 SmallVector<unsigned char /*WrapKind*/, 8> Stack; 3955 3956 FunctionTypeUnwrapper(Sema &S, QualType T) : Original(T) { 3957 while (true) { 3958 const Type *Ty = T.getTypePtr(); 3959 if (isa<FunctionType>(Ty)) { 3960 Fn = cast<FunctionType>(Ty); 3961 return; 3962 } else if (isa<ParenType>(Ty)) { 3963 T = cast<ParenType>(Ty)->getInnerType(); 3964 Stack.push_back(Parens); 3965 } else if (isa<PointerType>(Ty)) { 3966 T = cast<PointerType>(Ty)->getPointeeType(); 3967 Stack.push_back(Pointer); 3968 } else if (isa<BlockPointerType>(Ty)) { 3969 T = cast<BlockPointerType>(Ty)->getPointeeType(); 3970 Stack.push_back(BlockPointer); 3971 } else if (isa<MemberPointerType>(Ty)) { 3972 T = cast<MemberPointerType>(Ty)->getPointeeType(); 3973 Stack.push_back(MemberPointer); 3974 } else if (isa<ReferenceType>(Ty)) { 3975 T = cast<ReferenceType>(Ty)->getPointeeType(); 3976 Stack.push_back(Reference); 3977 } else { 3978 const Type *DTy = Ty->getUnqualifiedDesugaredType(); 3979 if (Ty == DTy) { 3980 Fn = 0; 3981 return; 3982 } 3983 3984 T = QualType(DTy, 0); 3985 Stack.push_back(Desugar); 3986 } 3987 } 3988 } 3989 3990 bool isFunctionType() const { return (Fn != 0); } 3991 const FunctionType *get() const { return Fn; } 3992 3993 QualType wrap(Sema &S, const FunctionType *New) { 3994 // If T wasn't modified from the unwrapped type, do nothing. 3995 if (New == get()) return Original; 3996 3997 Fn = New; 3998 return wrap(S.Context, Original, 0); 3999 } 4000 4001 private: 4002 QualType wrap(ASTContext &C, QualType Old, unsigned I) { 4003 if (I == Stack.size()) 4004 return C.getQualifiedType(Fn, Old.getQualifiers()); 4005 4006 // Build up the inner type, applying the qualifiers from the old 4007 // type to the new type. 4008 SplitQualType SplitOld = Old.split(); 4009 4010 // As a special case, tail-recurse if there are no qualifiers. 4011 if (SplitOld.Quals.empty()) 4012 return wrap(C, SplitOld.Ty, I); 4013 return C.getQualifiedType(wrap(C, SplitOld.Ty, I), SplitOld.Quals); 4014 } 4015 4016 QualType wrap(ASTContext &C, const Type *Old, unsigned I) { 4017 if (I == Stack.size()) return QualType(Fn, 0); 4018 4019 switch (static_cast<WrapKind>(Stack[I++])) { 4020 case Desugar: 4021 // This is the point at which we potentially lose source 4022 // information. 4023 return wrap(C, Old->getUnqualifiedDesugaredType(), I); 4024 4025 case Parens: { 4026 QualType New = wrap(C, cast<ParenType>(Old)->getInnerType(), I); 4027 return C.getParenType(New); 4028 } 4029 4030 case Pointer: { 4031 QualType New = wrap(C, cast<PointerType>(Old)->getPointeeType(), I); 4032 return C.getPointerType(New); 4033 } 4034 4035 case BlockPointer: { 4036 QualType New = wrap(C, cast<BlockPointerType>(Old)->getPointeeType(),I); 4037 return C.getBlockPointerType(New); 4038 } 4039 4040 case MemberPointer: { 4041 const MemberPointerType *OldMPT = cast<MemberPointerType>(Old); 4042 QualType New = wrap(C, OldMPT->getPointeeType(), I); 4043 return C.getMemberPointerType(New, OldMPT->getClass()); 4044 } 4045 4046 case Reference: { 4047 const ReferenceType *OldRef = cast<ReferenceType>(Old); 4048 QualType New = wrap(C, OldRef->getPointeeType(), I); 4049 if (isa<LValueReferenceType>(OldRef)) 4050 return C.getLValueReferenceType(New, OldRef->isSpelledAsLValue()); 4051 else 4052 return C.getRValueReferenceType(New); 4053 } 4054 } 4055 4056 llvm_unreachable("unknown wrapping kind"); 4057 } 4058 }; 4059} 4060 4061/// Process an individual function attribute. Returns true to 4062/// indicate that the attribute was handled, false if it wasn't. 4063static bool handleFunctionTypeAttr(TypeProcessingState &state, 4064 AttributeList &attr, 4065 QualType &type) { 4066 Sema &S = state.getSema(); 4067 4068 FunctionTypeUnwrapper unwrapped(S, type); 4069 4070 if (attr.getKind() == AttributeList::AT_NoReturn) { 4071 if (S.CheckNoReturnAttr(attr)) 4072 return true; 4073 4074 // Delay if this is not a function type. 4075 if (!unwrapped.isFunctionType()) 4076 return false; 4077 4078 // Otherwise we can process right away. 4079 FunctionType::ExtInfo EI = unwrapped.get()->getExtInfo().withNoReturn(true); 4080 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 4081 return true; 4082 } 4083 4084 // ns_returns_retained is not always a type attribute, but if we got 4085 // here, we're treating it as one right now. 4086 if (attr.getKind() == AttributeList::AT_NSReturnsRetained) { 4087 assert(S.getLangOpts().ObjCAutoRefCount && 4088 "ns_returns_retained treated as type attribute in non-ARC"); 4089 if (attr.getNumArgs()) return true; 4090 4091 // Delay if this is not a function type. 4092 if (!unwrapped.isFunctionType()) 4093 return false; 4094 4095 FunctionType::ExtInfo EI 4096 = unwrapped.get()->getExtInfo().withProducesResult(true); 4097 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 4098 return true; 4099 } 4100 4101 if (attr.getKind() == AttributeList::AT_Regparm) { 4102 unsigned value; 4103 if (S.CheckRegparmAttr(attr, value)) 4104 return true; 4105 4106 // Delay if this is not a function type. 4107 if (!unwrapped.isFunctionType()) 4108 return false; 4109 4110 // Diagnose regparm with fastcall. 4111 const FunctionType *fn = unwrapped.get(); 4112 CallingConv CC = fn->getCallConv(); 4113 if (CC == CC_X86FastCall) { 4114 S.Diag(attr.getLoc(), diag::err_attributes_are_not_compatible) 4115 << FunctionType::getNameForCallConv(CC) 4116 << "regparm"; 4117 attr.setInvalid(); 4118 return true; 4119 } 4120 4121 FunctionType::ExtInfo EI = 4122 unwrapped.get()->getExtInfo().withRegParm(value); 4123 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 4124 return true; 4125 } 4126 4127 // Delay if the type didn't work out to a function. 4128 if (!unwrapped.isFunctionType()) return false; 4129 4130 // Otherwise, a calling convention. 4131 CallingConv CC; 4132 if (S.CheckCallingConvAttr(attr, CC)) 4133 return true; 4134 4135 const FunctionType *fn = unwrapped.get(); 4136 CallingConv CCOld = fn->getCallConv(); 4137 if (S.Context.getCanonicalCallConv(CC) == 4138 S.Context.getCanonicalCallConv(CCOld)) { 4139 FunctionType::ExtInfo EI= unwrapped.get()->getExtInfo().withCallingConv(CC); 4140 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 4141 return true; 4142 } 4143 4144 if (CCOld != (S.LangOpts.MRTD ? CC_X86StdCall : CC_Default)) { 4145 // Should we diagnose reapplications of the same convention? 4146 S.Diag(attr.getLoc(), diag::err_attributes_are_not_compatible) 4147 << FunctionType::getNameForCallConv(CC) 4148 << FunctionType::getNameForCallConv(CCOld); 4149 attr.setInvalid(); 4150 return true; 4151 } 4152 4153 // Diagnose the use of X86 fastcall on varargs or unprototyped functions. 4154 if (CC == CC_X86FastCall) { 4155 if (isa<FunctionNoProtoType>(fn)) { 4156 S.Diag(attr.getLoc(), diag::err_cconv_knr) 4157 << FunctionType::getNameForCallConv(CC); 4158 attr.setInvalid(); 4159 return true; 4160 } 4161 4162 const FunctionProtoType *FnP = cast<FunctionProtoType>(fn); 4163 if (FnP->isVariadic()) { 4164 S.Diag(attr.getLoc(), diag::err_cconv_varargs) 4165 << FunctionType::getNameForCallConv(CC); 4166 attr.setInvalid(); 4167 return true; 4168 } 4169 4170 // Also diagnose fastcall with regparm. 4171 if (fn->getHasRegParm()) { 4172 S.Diag(attr.getLoc(), diag::err_attributes_are_not_compatible) 4173 << "regparm" 4174 << FunctionType::getNameForCallConv(CC); 4175 attr.setInvalid(); 4176 return true; 4177 } 4178 } 4179 4180 FunctionType::ExtInfo EI = unwrapped.get()->getExtInfo().withCallingConv(CC); 4181 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 4182 return true; 4183} 4184 4185/// Handle OpenCL image access qualifiers: read_only, write_only, read_write 4186static void HandleOpenCLImageAccessAttribute(QualType& CurType, 4187 const AttributeList &Attr, 4188 Sema &S) { 4189 // Check the attribute arguments. 4190 if (Attr.getNumArgs() != 1) { 4191 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 4192 Attr.setInvalid(); 4193 return; 4194 } 4195 Expr *sizeExpr = static_cast<Expr *>(Attr.getArg(0)); 4196 llvm::APSInt arg(32); 4197 if (sizeExpr->isTypeDependent() || sizeExpr->isValueDependent() || 4198 !sizeExpr->isIntegerConstantExpr(arg, S.Context)) { 4199 S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int) 4200 << "opencl_image_access" << sizeExpr->getSourceRange(); 4201 Attr.setInvalid(); 4202 return; 4203 } 4204 unsigned iarg = static_cast<unsigned>(arg.getZExtValue()); 4205 switch (iarg) { 4206 case CLIA_read_only: 4207 case CLIA_write_only: 4208 case CLIA_read_write: 4209 // Implemented in a separate patch 4210 break; 4211 default: 4212 // Implemented in a separate patch 4213 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_size) 4214 << sizeExpr->getSourceRange(); 4215 Attr.setInvalid(); 4216 break; 4217 } 4218} 4219 4220/// HandleVectorSizeAttribute - this attribute is only applicable to integral 4221/// and float scalars, although arrays, pointers, and function return values are 4222/// allowed in conjunction with this construct. Aggregates with this attribute 4223/// are invalid, even if they are of the same size as a corresponding scalar. 4224/// The raw attribute should contain precisely 1 argument, the vector size for 4225/// the variable, measured in bytes. If curType and rawAttr are well formed, 4226/// this routine will return a new vector type. 4227static void HandleVectorSizeAttr(QualType& CurType, const AttributeList &Attr, 4228 Sema &S) { 4229 // Check the attribute arguments. 4230 if (Attr.getNumArgs() != 1) { 4231 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 4232 Attr.setInvalid(); 4233 return; 4234 } 4235 Expr *sizeExpr = static_cast<Expr *>(Attr.getArg(0)); 4236 llvm::APSInt vecSize(32); 4237 if (sizeExpr->isTypeDependent() || sizeExpr->isValueDependent() || 4238 !sizeExpr->isIntegerConstantExpr(vecSize, S.Context)) { 4239 S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int) 4240 << "vector_size" << sizeExpr->getSourceRange(); 4241 Attr.setInvalid(); 4242 return; 4243 } 4244 // the base type must be integer or float, and can't already be a vector. 4245 if (!CurType->isIntegerType() && !CurType->isRealFloatingType()) { 4246 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_vector_type) << CurType; 4247 Attr.setInvalid(); 4248 return; 4249 } 4250 unsigned typeSize = static_cast<unsigned>(S.Context.getTypeSize(CurType)); 4251 // vecSize is specified in bytes - convert to bits. 4252 unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue() * 8); 4253 4254 // the vector size needs to be an integral multiple of the type size. 4255 if (vectorSize % typeSize) { 4256 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_size) 4257 << sizeExpr->getSourceRange(); 4258 Attr.setInvalid(); 4259 return; 4260 } 4261 if (vectorSize == 0) { 4262 S.Diag(Attr.getLoc(), diag::err_attribute_zero_size) 4263 << sizeExpr->getSourceRange(); 4264 Attr.setInvalid(); 4265 return; 4266 } 4267 4268 // Success! Instantiate the vector type, the number of elements is > 0, and 4269 // not required to be a power of 2, unlike GCC. 4270 CurType = S.Context.getVectorType(CurType, vectorSize/typeSize, 4271 VectorType::GenericVector); 4272} 4273 4274/// \brief Process the OpenCL-like ext_vector_type attribute when it occurs on 4275/// a type. 4276static void HandleExtVectorTypeAttr(QualType &CurType, 4277 const AttributeList &Attr, 4278 Sema &S) { 4279 Expr *sizeExpr; 4280 4281 // Special case where the argument is a template id. 4282 if (Attr.getParameterName()) { 4283 CXXScopeSpec SS; 4284 SourceLocation TemplateKWLoc; 4285 UnqualifiedId id; 4286 id.setIdentifier(Attr.getParameterName(), Attr.getLoc()); 4287 4288 ExprResult Size = S.ActOnIdExpression(S.getCurScope(), SS, TemplateKWLoc, 4289 id, false, false); 4290 if (Size.isInvalid()) 4291 return; 4292 4293 sizeExpr = Size.get(); 4294 } else { 4295 // check the attribute arguments. 4296 if (Attr.getNumArgs() != 1) { 4297 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 4298 return; 4299 } 4300 sizeExpr = Attr.getArg(0); 4301 } 4302 4303 // Create the vector type. 4304 QualType T = S.BuildExtVectorType(CurType, sizeExpr, Attr.getLoc()); 4305 if (!T.isNull()) 4306 CurType = T; 4307} 4308 4309/// HandleNeonVectorTypeAttr - The "neon_vector_type" and 4310/// "neon_polyvector_type" attributes are used to create vector types that 4311/// are mangled according to ARM's ABI. Otherwise, these types are identical 4312/// to those created with the "vector_size" attribute. Unlike "vector_size" 4313/// the argument to these Neon attributes is the number of vector elements, 4314/// not the vector size in bytes. The vector width and element type must 4315/// match one of the standard Neon vector types. 4316static void HandleNeonVectorTypeAttr(QualType& CurType, 4317 const AttributeList &Attr, Sema &S, 4318 VectorType::VectorKind VecKind, 4319 const char *AttrName) { 4320 // Check the attribute arguments. 4321 if (Attr.getNumArgs() != 1) { 4322 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 4323 Attr.setInvalid(); 4324 return; 4325 } 4326 // The number of elements must be an ICE. 4327 Expr *numEltsExpr = static_cast<Expr *>(Attr.getArg(0)); 4328 llvm::APSInt numEltsInt(32); 4329 if (numEltsExpr->isTypeDependent() || numEltsExpr->isValueDependent() || 4330 !numEltsExpr->isIntegerConstantExpr(numEltsInt, S.Context)) { 4331 S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int) 4332 << AttrName << numEltsExpr->getSourceRange(); 4333 Attr.setInvalid(); 4334 return; 4335 } 4336 // Only certain element types are supported for Neon vectors. 4337 const BuiltinType* BTy = CurType->getAs<BuiltinType>(); 4338 if (!BTy || 4339 (VecKind == VectorType::NeonPolyVector && 4340 BTy->getKind() != BuiltinType::SChar && 4341 BTy->getKind() != BuiltinType::Short) || 4342 (BTy->getKind() != BuiltinType::SChar && 4343 BTy->getKind() != BuiltinType::UChar && 4344 BTy->getKind() != BuiltinType::Short && 4345 BTy->getKind() != BuiltinType::UShort && 4346 BTy->getKind() != BuiltinType::Int && 4347 BTy->getKind() != BuiltinType::UInt && 4348 BTy->getKind() != BuiltinType::LongLong && 4349 BTy->getKind() != BuiltinType::ULongLong && 4350 BTy->getKind() != BuiltinType::Float)) { 4351 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_vector_type) <<CurType; 4352 Attr.setInvalid(); 4353 return; 4354 } 4355 // The total size of the vector must be 64 or 128 bits. 4356 unsigned typeSize = static_cast<unsigned>(S.Context.getTypeSize(CurType)); 4357 unsigned numElts = static_cast<unsigned>(numEltsInt.getZExtValue()); 4358 unsigned vecSize = typeSize * numElts; 4359 if (vecSize != 64 && vecSize != 128) { 4360 S.Diag(Attr.getLoc(), diag::err_attribute_bad_neon_vector_size) << CurType; 4361 Attr.setInvalid(); 4362 return; 4363 } 4364 4365 CurType = S.Context.getVectorType(CurType, numElts, VecKind); 4366} 4367 4368static void processTypeAttrs(TypeProcessingState &state, QualType &type, 4369 TypeAttrLocation TAL, AttributeList *attrs) { 4370 // Scan through and apply attributes to this type where it makes sense. Some 4371 // attributes (such as __address_space__, __vector_size__, etc) apply to the 4372 // type, but others can be present in the type specifiers even though they 4373 // apply to the decl. Here we apply type attributes and ignore the rest. 4374 4375 AttributeList *next; 4376 do { 4377 AttributeList &attr = *attrs; 4378 next = attr.getNext(); 4379 4380 // Skip attributes that were marked to be invalid. 4381 if (attr.isInvalid()) 4382 continue; 4383 4384 if (attr.isCXX11Attribute()) { 4385 // [[gnu::...]] attributes are treated as declaration attributes, so may 4386 // not appertain to a DeclaratorChunk, even if we handle them as type 4387 // attributes. 4388 if (attr.getScopeName() && attr.getScopeName()->isStr("gnu")) { 4389 if (TAL == TAL_DeclChunk) { 4390 state.getSema().Diag(attr.getLoc(), 4391 diag::warn_cxx11_gnu_attribute_on_type) 4392 << attr.getName(); 4393 continue; 4394 } 4395 } else if (TAL != TAL_DeclChunk) { 4396 // Otherwise, only consider type processing for a C++11 attribute if 4397 // it's actually been applied to a type. 4398 continue; 4399 } 4400 } 4401 4402 // If this is an attribute we can handle, do so now, 4403 // otherwise, add it to the FnAttrs list for rechaining. 4404 switch (attr.getKind()) { 4405 default: 4406 // A C++11 attribute on a declarator chunk must appertain to a type. 4407 if (attr.isCXX11Attribute() && TAL == TAL_DeclChunk) { 4408 state.getSema().Diag(attr.getLoc(), diag::err_attribute_not_type_attr) 4409 << attr.getName(); 4410 attr.setUsedAsTypeAttr(); 4411 } 4412 break; 4413 4414 case AttributeList::UnknownAttribute: 4415 if (attr.isCXX11Attribute() && TAL == TAL_DeclChunk) 4416 state.getSema().Diag(attr.getLoc(), 4417 diag::warn_unknown_attribute_ignored) 4418 << attr.getName(); 4419 break; 4420 4421 case AttributeList::IgnoredAttribute: 4422 break; 4423 4424 case AttributeList::AT_MayAlias: 4425 // FIXME: This attribute needs to actually be handled, but if we ignore 4426 // it it breaks large amounts of Linux software. 4427 attr.setUsedAsTypeAttr(); 4428 break; 4429 case AttributeList::AT_AddressSpace: 4430 HandleAddressSpaceTypeAttribute(type, attr, state.getSema()); 4431 attr.setUsedAsTypeAttr(); 4432 break; 4433 OBJC_POINTER_TYPE_ATTRS_CASELIST: 4434 if (!handleObjCPointerTypeAttr(state, attr, type)) 4435 distributeObjCPointerTypeAttr(state, attr, type); 4436 attr.setUsedAsTypeAttr(); 4437 break; 4438 case AttributeList::AT_VectorSize: 4439 HandleVectorSizeAttr(type, attr, state.getSema()); 4440 attr.setUsedAsTypeAttr(); 4441 break; 4442 case AttributeList::AT_ExtVectorType: 4443 HandleExtVectorTypeAttr(type, attr, state.getSema()); 4444 attr.setUsedAsTypeAttr(); 4445 break; 4446 case AttributeList::AT_NeonVectorType: 4447 HandleNeonVectorTypeAttr(type, attr, state.getSema(), 4448 VectorType::NeonVector, "neon_vector_type"); 4449 attr.setUsedAsTypeAttr(); 4450 break; 4451 case AttributeList::AT_NeonPolyVectorType: 4452 HandleNeonVectorTypeAttr(type, attr, state.getSema(), 4453 VectorType::NeonPolyVector, 4454 "neon_polyvector_type"); 4455 attr.setUsedAsTypeAttr(); 4456 break; 4457 case AttributeList::AT_OpenCLImageAccess: 4458 HandleOpenCLImageAccessAttribute(type, attr, state.getSema()); 4459 attr.setUsedAsTypeAttr(); 4460 break; 4461 4462 case AttributeList::AT_Win64: 4463 case AttributeList::AT_Ptr32: 4464 case AttributeList::AT_Ptr64: 4465 // FIXME: Don't ignore these. We have partial handling for them as 4466 // declaration attributes in SemaDeclAttr.cpp; that should be moved here. 4467 attr.setUsedAsTypeAttr(); 4468 break; 4469 4470 case AttributeList::AT_NSReturnsRetained: 4471 if (!state.getSema().getLangOpts().ObjCAutoRefCount) 4472 break; 4473 // fallthrough into the function attrs 4474 4475 FUNCTION_TYPE_ATTRS_CASELIST: 4476 attr.setUsedAsTypeAttr(); 4477 4478 // Never process function type attributes as part of the 4479 // declaration-specifiers. 4480 if (TAL == TAL_DeclSpec) 4481 distributeFunctionTypeAttrFromDeclSpec(state, attr, type); 4482 4483 // Otherwise, handle the possible delays. 4484 else if (!handleFunctionTypeAttr(state, attr, type)) 4485 distributeFunctionTypeAttr(state, attr, type); 4486 break; 4487 } 4488 } while ((attrs = next)); 4489} 4490 4491/// \brief Ensure that the type of the given expression is complete. 4492/// 4493/// This routine checks whether the expression \p E has a complete type. If the 4494/// expression refers to an instantiable construct, that instantiation is 4495/// performed as needed to complete its type. Furthermore 4496/// Sema::RequireCompleteType is called for the expression's type (or in the 4497/// case of a reference type, the referred-to type). 4498/// 4499/// \param E The expression whose type is required to be complete. 4500/// \param Diagnoser The object that will emit a diagnostic if the type is 4501/// incomplete. 4502/// 4503/// \returns \c true if the type of \p E is incomplete and diagnosed, \c false 4504/// otherwise. 4505bool Sema::RequireCompleteExprType(Expr *E, TypeDiagnoser &Diagnoser){ 4506 QualType T = E->getType(); 4507 4508 // Fast path the case where the type is already complete. 4509 if (!T->isIncompleteType()) 4510 return false; 4511 4512 // Incomplete array types may be completed by the initializer attached to 4513 // their definitions. For static data members of class templates we need to 4514 // instantiate the definition to get this initializer and complete the type. 4515 if (T->isIncompleteArrayType()) { 4516 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E->IgnoreParens())) { 4517 if (VarDecl *Var = dyn_cast<VarDecl>(DRE->getDecl())) { 4518 if (Var->isStaticDataMember() && 4519 Var->getInstantiatedFromStaticDataMember()) { 4520 4521 MemberSpecializationInfo *MSInfo = Var->getMemberSpecializationInfo(); 4522 assert(MSInfo && "Missing member specialization information?"); 4523 if (MSInfo->getTemplateSpecializationKind() 4524 != TSK_ExplicitSpecialization) { 4525 // If we don't already have a point of instantiation, this is it. 4526 if (MSInfo->getPointOfInstantiation().isInvalid()) { 4527 MSInfo->setPointOfInstantiation(E->getLocStart()); 4528 4529 // This is a modification of an existing AST node. Notify 4530 // listeners. 4531 if (ASTMutationListener *L = getASTMutationListener()) 4532 L->StaticDataMemberInstantiated(Var); 4533 } 4534 4535 InstantiateStaticDataMemberDefinition(E->getExprLoc(), Var); 4536 4537 // Update the type to the newly instantiated definition's type both 4538 // here and within the expression. 4539 if (VarDecl *Def = Var->getDefinition()) { 4540 DRE->setDecl(Def); 4541 T = Def->getType(); 4542 DRE->setType(T); 4543 E->setType(T); 4544 } 4545 } 4546 4547 // We still go on to try to complete the type independently, as it 4548 // may also require instantiations or diagnostics if it remains 4549 // incomplete. 4550 } 4551 } 4552 } 4553 } 4554 4555 // FIXME: Are there other cases which require instantiating something other 4556 // than the type to complete the type of an expression? 4557 4558 // Look through reference types and complete the referred type. 4559 if (const ReferenceType *Ref = T->getAs<ReferenceType>()) 4560 T = Ref->getPointeeType(); 4561 4562 return RequireCompleteType(E->getExprLoc(), T, Diagnoser); 4563} 4564 4565namespace { 4566 struct TypeDiagnoserDiag : Sema::TypeDiagnoser { 4567 unsigned DiagID; 4568 4569 TypeDiagnoserDiag(unsigned DiagID) 4570 : Sema::TypeDiagnoser(DiagID == 0), DiagID(DiagID) {} 4571 4572 virtual void diagnose(Sema &S, SourceLocation Loc, QualType T) { 4573 if (Suppressed) return; 4574 S.Diag(Loc, DiagID) << T; 4575 } 4576 }; 4577} 4578 4579bool Sema::RequireCompleteExprType(Expr *E, unsigned DiagID) { 4580 TypeDiagnoserDiag Diagnoser(DiagID); 4581 return RequireCompleteExprType(E, Diagnoser); 4582} 4583 4584/// @brief Ensure that the type T is a complete type. 4585/// 4586/// This routine checks whether the type @p T is complete in any 4587/// context where a complete type is required. If @p T is a complete 4588/// type, returns false. If @p T is a class template specialization, 4589/// this routine then attempts to perform class template 4590/// instantiation. If instantiation fails, or if @p T is incomplete 4591/// and cannot be completed, issues the diagnostic @p diag (giving it 4592/// the type @p T) and returns true. 4593/// 4594/// @param Loc The location in the source that the incomplete type 4595/// diagnostic should refer to. 4596/// 4597/// @param T The type that this routine is examining for completeness. 4598/// 4599/// @returns @c true if @p T is incomplete and a diagnostic was emitted, 4600/// @c false otherwise. 4601bool Sema::RequireCompleteType(SourceLocation Loc, QualType T, 4602 TypeDiagnoser &Diagnoser) { 4603 // FIXME: Add this assertion to make sure we always get instantiation points. 4604 // assert(!Loc.isInvalid() && "Invalid location in RequireCompleteType"); 4605 // FIXME: Add this assertion to help us flush out problems with 4606 // checking for dependent types and type-dependent expressions. 4607 // 4608 // assert(!T->isDependentType() && 4609 // "Can't ask whether a dependent type is complete"); 4610 4611 // If we have a complete type, we're done. 4612 NamedDecl *Def = 0; 4613 if (!T->isIncompleteType(&Def)) { 4614 // If we know about the definition but it is not visible, complain. 4615 if (!Diagnoser.Suppressed && Def && !LookupResult::isVisible(Def)) { 4616 // Suppress this error outside of a SFINAE context if we've already 4617 // emitted the error once for this type. There's no usefulness in 4618 // repeating the diagnostic. 4619 // FIXME: Add a Fix-It that imports the corresponding module or includes 4620 // the header. 4621 Module *Owner = Def->getOwningModule(); 4622 Diag(Loc, diag::err_module_private_definition) 4623 << T << Owner->getFullModuleName(); 4624 Diag(Def->getLocation(), diag::note_previous_definition); 4625 4626 if (!isSFINAEContext()) { 4627 // Recover by implicitly importing this module. 4628 createImplicitModuleImport(Loc, Owner); 4629 } 4630 } 4631 4632 return false; 4633 } 4634 4635 const TagType *Tag = T->getAs<TagType>(); 4636 const ObjCInterfaceType *IFace = 0; 4637 4638 if (Tag) { 4639 // Avoid diagnosing invalid decls as incomplete. 4640 if (Tag->getDecl()->isInvalidDecl()) 4641 return true; 4642 4643 // Give the external AST source a chance to complete the type. 4644 if (Tag->getDecl()->hasExternalLexicalStorage()) { 4645 Context.getExternalSource()->CompleteType(Tag->getDecl()); 4646 if (!Tag->isIncompleteType()) 4647 return false; 4648 } 4649 } 4650 else if ((IFace = T->getAs<ObjCInterfaceType>())) { 4651 // Avoid diagnosing invalid decls as incomplete. 4652 if (IFace->getDecl()->isInvalidDecl()) 4653 return true; 4654 4655 // Give the external AST source a chance to complete the type. 4656 if (IFace->getDecl()->hasExternalLexicalStorage()) { 4657 Context.getExternalSource()->CompleteType(IFace->getDecl()); 4658 if (!IFace->isIncompleteType()) 4659 return false; 4660 } 4661 } 4662 4663 // If we have a class template specialization or a class member of a 4664 // class template specialization, or an array with known size of such, 4665 // try to instantiate it. 4666 QualType MaybeTemplate = T; 4667 while (const ConstantArrayType *Array 4668 = Context.getAsConstantArrayType(MaybeTemplate)) 4669 MaybeTemplate = Array->getElementType(); 4670 if (const RecordType *Record = MaybeTemplate->getAs<RecordType>()) { 4671 if (ClassTemplateSpecializationDecl *ClassTemplateSpec 4672 = dyn_cast<ClassTemplateSpecializationDecl>(Record->getDecl())) { 4673 if (ClassTemplateSpec->getSpecializationKind() == TSK_Undeclared) 4674 return InstantiateClassTemplateSpecialization(Loc, ClassTemplateSpec, 4675 TSK_ImplicitInstantiation, 4676 /*Complain=*/!Diagnoser.Suppressed); 4677 } else if (CXXRecordDecl *Rec 4678 = dyn_cast<CXXRecordDecl>(Record->getDecl())) { 4679 CXXRecordDecl *Pattern = Rec->getInstantiatedFromMemberClass(); 4680 if (!Rec->isBeingDefined() && Pattern) { 4681 MemberSpecializationInfo *MSI = Rec->getMemberSpecializationInfo(); 4682 assert(MSI && "Missing member specialization information?"); 4683 // This record was instantiated from a class within a template. 4684 if (MSI->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 4685 return InstantiateClass(Loc, Rec, Pattern, 4686 getTemplateInstantiationArgs(Rec), 4687 TSK_ImplicitInstantiation, 4688 /*Complain=*/!Diagnoser.Suppressed); 4689 } 4690 } 4691 } 4692 4693 if (Diagnoser.Suppressed) 4694 return true; 4695 4696 // We have an incomplete type. Produce a diagnostic. 4697 Diagnoser.diagnose(*this, Loc, T); 4698 4699 // If the type was a forward declaration of a class/struct/union 4700 // type, produce a note. 4701 if (Tag && !Tag->getDecl()->isInvalidDecl()) 4702 Diag(Tag->getDecl()->getLocation(), 4703 Tag->isBeingDefined() ? diag::note_type_being_defined 4704 : diag::note_forward_declaration) 4705 << QualType(Tag, 0); 4706 4707 // If the Objective-C class was a forward declaration, produce a note. 4708 if (IFace && !IFace->getDecl()->isInvalidDecl()) 4709 Diag(IFace->getDecl()->getLocation(), diag::note_forward_class); 4710 4711 return true; 4712} 4713 4714bool Sema::RequireCompleteType(SourceLocation Loc, QualType T, 4715 unsigned DiagID) { 4716 TypeDiagnoserDiag Diagnoser(DiagID); 4717 return RequireCompleteType(Loc, T, Diagnoser); 4718} 4719 4720/// \brief Get diagnostic %select index for tag kind for 4721/// literal type diagnostic message. 4722/// WARNING: Indexes apply to particular diagnostics only! 4723/// 4724/// \returns diagnostic %select index. 4725static unsigned getLiteralDiagFromTagKind(TagTypeKind Tag) { 4726 switch (Tag) { 4727 case TTK_Struct: return 0; 4728 case TTK_Interface: return 1; 4729 case TTK_Class: return 2; 4730 default: llvm_unreachable("Invalid tag kind for literal type diagnostic!"); 4731 } 4732} 4733 4734/// @brief Ensure that the type T is a literal type. 4735/// 4736/// This routine checks whether the type @p T is a literal type. If @p T is an 4737/// incomplete type, an attempt is made to complete it. If @p T is a literal 4738/// type, or @p AllowIncompleteType is true and @p T is an incomplete type, 4739/// returns false. Otherwise, this routine issues the diagnostic @p PD (giving 4740/// it the type @p T), along with notes explaining why the type is not a 4741/// literal type, and returns true. 4742/// 4743/// @param Loc The location in the source that the non-literal type 4744/// diagnostic should refer to. 4745/// 4746/// @param T The type that this routine is examining for literalness. 4747/// 4748/// @param Diagnoser Emits a diagnostic if T is not a literal type. 4749/// 4750/// @returns @c true if @p T is not a literal type and a diagnostic was emitted, 4751/// @c false otherwise. 4752bool Sema::RequireLiteralType(SourceLocation Loc, QualType T, 4753 TypeDiagnoser &Diagnoser) { 4754 assert(!T->isDependentType() && "type should not be dependent"); 4755 4756 QualType ElemType = Context.getBaseElementType(T); 4757 RequireCompleteType(Loc, ElemType, 0); 4758 4759 if (T->isLiteralType()) 4760 return false; 4761 4762 if (Diagnoser.Suppressed) 4763 return true; 4764 4765 Diagnoser.diagnose(*this, Loc, T); 4766 4767 if (T->isVariableArrayType()) 4768 return true; 4769 4770 const RecordType *RT = ElemType->getAs<RecordType>(); 4771 if (!RT) 4772 return true; 4773 4774 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 4775 4776 // A partially-defined class type can't be a literal type, because a literal 4777 // class type must have a trivial destructor (which can't be checked until 4778 // the class definition is complete). 4779 if (!RD->isCompleteDefinition()) { 4780 RequireCompleteType(Loc, ElemType, diag::note_non_literal_incomplete, T); 4781 return true; 4782 } 4783 4784 // If the class has virtual base classes, then it's not an aggregate, and 4785 // cannot have any constexpr constructors or a trivial default constructor, 4786 // so is non-literal. This is better to diagnose than the resulting absence 4787 // of constexpr constructors. 4788 if (RD->getNumVBases()) { 4789 Diag(RD->getLocation(), diag::note_non_literal_virtual_base) 4790 << getLiteralDiagFromTagKind(RD->getTagKind()) << RD->getNumVBases(); 4791 for (CXXRecordDecl::base_class_const_iterator I = RD->vbases_begin(), 4792 E = RD->vbases_end(); I != E; ++I) 4793 Diag(I->getLocStart(), 4794 diag::note_constexpr_virtual_base_here) << I->getSourceRange(); 4795 } else if (!RD->isAggregate() && !RD->hasConstexprNonCopyMoveConstructor() && 4796 !RD->hasTrivialDefaultConstructor()) { 4797 Diag(RD->getLocation(), diag::note_non_literal_no_constexpr_ctors) << RD; 4798 } else if (RD->hasNonLiteralTypeFieldsOrBases()) { 4799 for (CXXRecordDecl::base_class_const_iterator I = RD->bases_begin(), 4800 E = RD->bases_end(); I != E; ++I) { 4801 if (!I->getType()->isLiteralType()) { 4802 Diag(I->getLocStart(), 4803 diag::note_non_literal_base_class) 4804 << RD << I->getType() << I->getSourceRange(); 4805 return true; 4806 } 4807 } 4808 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 4809 E = RD->field_end(); I != E; ++I) { 4810 if (!I->getType()->isLiteralType() || 4811 I->getType().isVolatileQualified()) { 4812 Diag(I->getLocation(), diag::note_non_literal_field) 4813 << RD << *I << I->getType() 4814 << I->getType().isVolatileQualified(); 4815 return true; 4816 } 4817 } 4818 } else if (!RD->hasTrivialDestructor()) { 4819 // All fields and bases are of literal types, so have trivial destructors. 4820 // If this class's destructor is non-trivial it must be user-declared. 4821 CXXDestructorDecl *Dtor = RD->getDestructor(); 4822 assert(Dtor && "class has literal fields and bases but no dtor?"); 4823 if (!Dtor) 4824 return true; 4825 4826 Diag(Dtor->getLocation(), Dtor->isUserProvided() ? 4827 diag::note_non_literal_user_provided_dtor : 4828 diag::note_non_literal_nontrivial_dtor) << RD; 4829 if (!Dtor->isUserProvided()) 4830 SpecialMemberIsTrivial(Dtor, CXXDestructor, /*Diagnose*/true); 4831 } 4832 4833 return true; 4834} 4835 4836bool Sema::RequireLiteralType(SourceLocation Loc, QualType T, unsigned DiagID) { 4837 TypeDiagnoserDiag Diagnoser(DiagID); 4838 return RequireLiteralType(Loc, T, Diagnoser); 4839} 4840 4841/// \brief Retrieve a version of the type 'T' that is elaborated by Keyword 4842/// and qualified by the nested-name-specifier contained in SS. 4843QualType Sema::getElaboratedType(ElaboratedTypeKeyword Keyword, 4844 const CXXScopeSpec &SS, QualType T) { 4845 if (T.isNull()) 4846 return T; 4847 NestedNameSpecifier *NNS; 4848 if (SS.isValid()) 4849 NNS = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 4850 else { 4851 if (Keyword == ETK_None) 4852 return T; 4853 NNS = 0; 4854 } 4855 return Context.getElaboratedType(Keyword, NNS, T); 4856} 4857 4858QualType Sema::BuildTypeofExprType(Expr *E, SourceLocation Loc) { 4859 ExprResult ER = CheckPlaceholderExpr(E); 4860 if (ER.isInvalid()) return QualType(); 4861 E = ER.take(); 4862 4863 if (!E->isTypeDependent()) { 4864 QualType T = E->getType(); 4865 if (const TagType *TT = T->getAs<TagType>()) 4866 DiagnoseUseOfDecl(TT->getDecl(), E->getExprLoc()); 4867 } 4868 return Context.getTypeOfExprType(E); 4869} 4870 4871/// getDecltypeForExpr - Given an expr, will return the decltype for 4872/// that expression, according to the rules in C++11 4873/// [dcl.type.simple]p4 and C++11 [expr.lambda.prim]p18. 4874static QualType getDecltypeForExpr(Sema &S, Expr *E) { 4875 if (E->isTypeDependent()) 4876 return S.Context.DependentTy; 4877 4878 // C++11 [dcl.type.simple]p4: 4879 // The type denoted by decltype(e) is defined as follows: 4880 // 4881 // - if e is an unparenthesized id-expression or an unparenthesized class 4882 // member access (5.2.5), decltype(e) is the type of the entity named 4883 // by e. If there is no such entity, or if e names a set of overloaded 4884 // functions, the program is ill-formed; 4885 // 4886 // We apply the same rules for Objective-C ivar and property references. 4887 if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E)) { 4888 if (const ValueDecl *VD = dyn_cast<ValueDecl>(DRE->getDecl())) 4889 return VD->getType(); 4890 } else if (const MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 4891 if (const FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl())) 4892 return FD->getType(); 4893 } else if (const ObjCIvarRefExpr *IR = dyn_cast<ObjCIvarRefExpr>(E)) { 4894 return IR->getDecl()->getType(); 4895 } else if (const ObjCPropertyRefExpr *PR = dyn_cast<ObjCPropertyRefExpr>(E)) { 4896 if (PR->isExplicitProperty()) 4897 return PR->getExplicitProperty()->getType(); 4898 } 4899 4900 // C++11 [expr.lambda.prim]p18: 4901 // Every occurrence of decltype((x)) where x is a possibly 4902 // parenthesized id-expression that names an entity of automatic 4903 // storage duration is treated as if x were transformed into an 4904 // access to a corresponding data member of the closure type that 4905 // would have been declared if x were an odr-use of the denoted 4906 // entity. 4907 using namespace sema; 4908 if (S.getCurLambda()) { 4909 if (isa<ParenExpr>(E)) { 4910 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E->IgnoreParens())) { 4911 if (VarDecl *Var = dyn_cast<VarDecl>(DRE->getDecl())) { 4912 QualType T = S.getCapturedDeclRefType(Var, DRE->getLocation()); 4913 if (!T.isNull()) 4914 return S.Context.getLValueReferenceType(T); 4915 } 4916 } 4917 } 4918 } 4919 4920 4921 // C++11 [dcl.type.simple]p4: 4922 // [...] 4923 QualType T = E->getType(); 4924 switch (E->getValueKind()) { 4925 // - otherwise, if e is an xvalue, decltype(e) is T&&, where T is the 4926 // type of e; 4927 case VK_XValue: T = S.Context.getRValueReferenceType(T); break; 4928 // - otherwise, if e is an lvalue, decltype(e) is T&, where T is the 4929 // type of e; 4930 case VK_LValue: T = S.Context.getLValueReferenceType(T); break; 4931 // - otherwise, decltype(e) is the type of e. 4932 case VK_RValue: break; 4933 } 4934 4935 return T; 4936} 4937 4938QualType Sema::BuildDecltypeType(Expr *E, SourceLocation Loc) { 4939 ExprResult ER = CheckPlaceholderExpr(E); 4940 if (ER.isInvalid()) return QualType(); 4941 E = ER.take(); 4942 4943 return Context.getDecltypeType(E, getDecltypeForExpr(*this, E)); 4944} 4945 4946QualType Sema::BuildUnaryTransformType(QualType BaseType, 4947 UnaryTransformType::UTTKind UKind, 4948 SourceLocation Loc) { 4949 switch (UKind) { 4950 case UnaryTransformType::EnumUnderlyingType: 4951 if (!BaseType->isDependentType() && !BaseType->isEnumeralType()) { 4952 Diag(Loc, diag::err_only_enums_have_underlying_types); 4953 return QualType(); 4954 } else { 4955 QualType Underlying = BaseType; 4956 if (!BaseType->isDependentType()) { 4957 EnumDecl *ED = BaseType->getAs<EnumType>()->getDecl(); 4958 assert(ED && "EnumType has no EnumDecl"); 4959 DiagnoseUseOfDecl(ED, Loc); 4960 Underlying = ED->getIntegerType(); 4961 } 4962 assert(!Underlying.isNull()); 4963 return Context.getUnaryTransformType(BaseType, Underlying, 4964 UnaryTransformType::EnumUnderlyingType); 4965 } 4966 } 4967 llvm_unreachable("unknown unary transform type"); 4968} 4969 4970QualType Sema::BuildAtomicType(QualType T, SourceLocation Loc) { 4971 if (!T->isDependentType()) { 4972 // FIXME: It isn't entirely clear whether incomplete atomic types 4973 // are allowed or not; for simplicity, ban them for the moment. 4974 if (RequireCompleteType(Loc, T, diag::err_atomic_specifier_bad_type, 0)) 4975 return QualType(); 4976 4977 int DisallowedKind = -1; 4978 if (T->isArrayType()) 4979 DisallowedKind = 1; 4980 else if (T->isFunctionType()) 4981 DisallowedKind = 2; 4982 else if (T->isReferenceType()) 4983 DisallowedKind = 3; 4984 else if (T->isAtomicType()) 4985 DisallowedKind = 4; 4986 else if (T.hasQualifiers()) 4987 DisallowedKind = 5; 4988 else if (!T.isTriviallyCopyableType(Context)) 4989 // Some other non-trivially-copyable type (probably a C++ class) 4990 DisallowedKind = 6; 4991 4992 if (DisallowedKind != -1) { 4993 Diag(Loc, diag::err_atomic_specifier_bad_type) << DisallowedKind << T; 4994 return QualType(); 4995 } 4996 4997 // FIXME: Do we need any handling for ARC here? 4998 } 4999 5000 // Build the pointer type. 5001 return Context.getAtomicType(T); 5002} 5003