SemaType.cpp revision b2381b1c91ac5dc2407e98f36e3a6ba93d771791
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 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 1089 // or incomplete types shall not be restrict-qualified." C++ also allows 1090 // restrict-qualified references. 1091 if (TypeQuals & DeclSpec::TQ_restrict) { 1092 if (Result->isAnyPointerType() || Result->isReferenceType()) { 1093 QualType EltTy; 1094 if (Result->isObjCObjectPointerType()) 1095 EltTy = Result; 1096 else 1097 EltTy = Result->isPointerType() ? 1098 Result->getAs<PointerType>()->getPointeeType() : 1099 Result->getAs<ReferenceType>()->getPointeeType(); 1100 1101 // If we have a pointer or reference, the pointee must have an object 1102 // incomplete type. 1103 if (!EltTy->isIncompleteOrObjectType()) { 1104 S.Diag(DS.getRestrictSpecLoc(), 1105 diag::err_typecheck_invalid_restrict_invalid_pointee) 1106 << EltTy << DS.getSourceRange(); 1107 TypeQuals &= ~DeclSpec::TQ_restrict; // Remove the restrict qualifier. 1108 } 1109 } else { 1110 S.Diag(DS.getRestrictSpecLoc(), 1111 diag::err_typecheck_invalid_restrict_not_pointer) 1112 << Result << DS.getSourceRange(); 1113 TypeQuals &= ~DeclSpec::TQ_restrict; // Remove the restrict qualifier. 1114 } 1115 } 1116 1117 // Warn about CV qualifiers on functions: C99 6.7.3p8: "If the specification 1118 // of a function type includes any type qualifiers, the behavior is 1119 // undefined." 1120 if (Result->isFunctionType() && TypeQuals) { 1121 // Get some location to point at, either the C or V location. 1122 SourceLocation Loc; 1123 if (TypeQuals & DeclSpec::TQ_const) 1124 Loc = DS.getConstSpecLoc(); 1125 else if (TypeQuals & DeclSpec::TQ_volatile) 1126 Loc = DS.getVolatileSpecLoc(); 1127 else { 1128 assert((TypeQuals & DeclSpec::TQ_restrict) && 1129 "Has CVR quals but not C, V, or R?"); 1130 Loc = DS.getRestrictSpecLoc(); 1131 } 1132 S.Diag(Loc, diag::warn_typecheck_function_qualifiers) 1133 << Result << DS.getSourceRange(); 1134 } 1135 1136 // C++ [dcl.ref]p1: 1137 // Cv-qualified references are ill-formed except when the 1138 // cv-qualifiers are introduced through the use of a typedef 1139 // (7.1.3) or of a template type argument (14.3), in which 1140 // case the cv-qualifiers are ignored. 1141 // FIXME: Shouldn't we be checking SCS_typedef here? 1142 if (DS.getTypeSpecType() == DeclSpec::TST_typename && 1143 TypeQuals && Result->isReferenceType()) { 1144 TypeQuals &= ~DeclSpec::TQ_const; 1145 TypeQuals &= ~DeclSpec::TQ_volatile; 1146 } 1147 1148 // C90 6.5.3 constraints: "The same type qualifier shall not appear more 1149 // than once in the same specifier-list or qualifier-list, either directly 1150 // or via one or more typedefs." 1151 if (!S.getLangOpts().C99 && !S.getLangOpts().CPlusPlus 1152 && TypeQuals & Result.getCVRQualifiers()) { 1153 if (TypeQuals & DeclSpec::TQ_const && Result.isConstQualified()) { 1154 S.Diag(DS.getConstSpecLoc(), diag::ext_duplicate_declspec) 1155 << "const"; 1156 } 1157 1158 if (TypeQuals & DeclSpec::TQ_volatile && Result.isVolatileQualified()) { 1159 S.Diag(DS.getVolatileSpecLoc(), diag::ext_duplicate_declspec) 1160 << "volatile"; 1161 } 1162 1163 // C90 doesn't have restrict, so it doesn't force us to produce a warning 1164 // in this case. 1165 } 1166 1167 Qualifiers Quals = Qualifiers::fromCVRMask(TypeQuals); 1168 Result = Context.getQualifiedType(Result, Quals); 1169 } 1170 1171 return Result; 1172} 1173 1174static std::string getPrintableNameForEntity(DeclarationName Entity) { 1175 if (Entity) 1176 return Entity.getAsString(); 1177 1178 return "type name"; 1179} 1180 1181QualType Sema::BuildQualifiedType(QualType T, SourceLocation Loc, 1182 Qualifiers Qs) { 1183 // Enforce C99 6.7.3p2: "Types other than pointer types derived from 1184 // object or incomplete types shall not be restrict-qualified." 1185 if (Qs.hasRestrict()) { 1186 unsigned DiagID = 0; 1187 QualType ProblemTy; 1188 1189 const Type *Ty = T->getCanonicalTypeInternal().getTypePtr(); 1190 if (const ReferenceType *RTy = dyn_cast<ReferenceType>(Ty)) { 1191 if (!RTy->getPointeeType()->isIncompleteOrObjectType()) { 1192 DiagID = diag::err_typecheck_invalid_restrict_invalid_pointee; 1193 ProblemTy = T->getAs<ReferenceType>()->getPointeeType(); 1194 } 1195 } else if (const PointerType *PTy = dyn_cast<PointerType>(Ty)) { 1196 if (!PTy->getPointeeType()->isIncompleteOrObjectType()) { 1197 DiagID = diag::err_typecheck_invalid_restrict_invalid_pointee; 1198 ProblemTy = T->getAs<PointerType>()->getPointeeType(); 1199 } 1200 } else if (const MemberPointerType *PTy = dyn_cast<MemberPointerType>(Ty)) { 1201 if (!PTy->getPointeeType()->isIncompleteOrObjectType()) { 1202 DiagID = diag::err_typecheck_invalid_restrict_invalid_pointee; 1203 ProblemTy = T->getAs<PointerType>()->getPointeeType(); 1204 } 1205 } else if (!Ty->isDependentType()) { 1206 // FIXME: this deserves a proper diagnostic 1207 DiagID = diag::err_typecheck_invalid_restrict_invalid_pointee; 1208 ProblemTy = T; 1209 } 1210 1211 if (DiagID) { 1212 Diag(Loc, DiagID) << ProblemTy; 1213 Qs.removeRestrict(); 1214 } 1215 } 1216 1217 return Context.getQualifiedType(T, Qs); 1218} 1219 1220/// \brief Build a paren type including \p T. 1221QualType Sema::BuildParenType(QualType T) { 1222 return Context.getParenType(T); 1223} 1224 1225/// Given that we're building a pointer or reference to the given 1226static QualType inferARCLifetimeForPointee(Sema &S, QualType type, 1227 SourceLocation loc, 1228 bool isReference) { 1229 // Bail out if retention is unrequired or already specified. 1230 if (!type->isObjCLifetimeType() || 1231 type.getObjCLifetime() != Qualifiers::OCL_None) 1232 return type; 1233 1234 Qualifiers::ObjCLifetime implicitLifetime = Qualifiers::OCL_None; 1235 1236 // If the object type is const-qualified, we can safely use 1237 // __unsafe_unretained. This is safe (because there are no read 1238 // barriers), and it'll be safe to coerce anything but __weak* to 1239 // the resulting type. 1240 if (type.isConstQualified()) { 1241 implicitLifetime = Qualifiers::OCL_ExplicitNone; 1242 1243 // Otherwise, check whether the static type does not require 1244 // retaining. This currently only triggers for Class (possibly 1245 // protocol-qualifed, and arrays thereof). 1246 } else if (type->isObjCARCImplicitlyUnretainedType()) { 1247 implicitLifetime = Qualifiers::OCL_ExplicitNone; 1248 1249 // If we are in an unevaluated context, like sizeof, skip adding a 1250 // qualification. 1251 } else if (S.isUnevaluatedContext()) { 1252 return type; 1253 1254 // If that failed, give an error and recover using __strong. __strong 1255 // is the option most likely to prevent spurious second-order diagnostics, 1256 // like when binding a reference to a field. 1257 } else { 1258 // These types can show up in private ivars in system headers, so 1259 // we need this to not be an error in those cases. Instead we 1260 // want to delay. 1261 if (S.DelayedDiagnostics.shouldDelayDiagnostics()) { 1262 S.DelayedDiagnostics.add( 1263 sema::DelayedDiagnostic::makeForbiddenType(loc, 1264 diag::err_arc_indirect_no_ownership, type, isReference)); 1265 } else { 1266 S.Diag(loc, diag::err_arc_indirect_no_ownership) << type << isReference; 1267 } 1268 implicitLifetime = Qualifiers::OCL_Strong; 1269 } 1270 assert(implicitLifetime && "didn't infer any lifetime!"); 1271 1272 Qualifiers qs; 1273 qs.addObjCLifetime(implicitLifetime); 1274 return S.Context.getQualifiedType(type, qs); 1275} 1276 1277/// \brief Build a pointer type. 1278/// 1279/// \param T The type to which we'll be building a pointer. 1280/// 1281/// \param Loc The location of the entity whose type involves this 1282/// pointer type or, if there is no such entity, the location of the 1283/// type that will have pointer type. 1284/// 1285/// \param Entity The name of the entity that involves the pointer 1286/// type, if known. 1287/// 1288/// \returns A suitable pointer type, if there are no 1289/// errors. Otherwise, returns a NULL type. 1290QualType Sema::BuildPointerType(QualType T, 1291 SourceLocation Loc, DeclarationName Entity) { 1292 if (T->isReferenceType()) { 1293 // C++ 8.3.2p4: There shall be no ... pointers to references ... 1294 Diag(Loc, diag::err_illegal_decl_pointer_to_reference) 1295 << getPrintableNameForEntity(Entity) << T; 1296 return QualType(); 1297 } 1298 1299 assert(!T->isObjCObjectType() && "Should build ObjCObjectPointerType"); 1300 1301 // In ARC, it is forbidden to build pointers to unqualified pointers. 1302 if (getLangOpts().ObjCAutoRefCount) 1303 T = inferARCLifetimeForPointee(*this, T, Loc, /*reference*/ false); 1304 1305 // Build the pointer type. 1306 return Context.getPointerType(T); 1307} 1308 1309/// \brief Build a reference type. 1310/// 1311/// \param T The type to which we'll be building a reference. 1312/// 1313/// \param Loc The location of the entity whose type involves this 1314/// reference type or, if there is no such entity, the location of the 1315/// type that will have reference type. 1316/// 1317/// \param Entity The name of the entity that involves the reference 1318/// type, if known. 1319/// 1320/// \returns A suitable reference type, if there are no 1321/// errors. Otherwise, returns a NULL type. 1322QualType Sema::BuildReferenceType(QualType T, bool SpelledAsLValue, 1323 SourceLocation Loc, 1324 DeclarationName Entity) { 1325 assert(Context.getCanonicalType(T) != Context.OverloadTy && 1326 "Unresolved overloaded function type"); 1327 1328 // C++0x [dcl.ref]p6: 1329 // If a typedef (7.1.3), a type template-parameter (14.3.1), or a 1330 // decltype-specifier (7.1.6.2) denotes a type TR that is a reference to a 1331 // type T, an attempt to create the type "lvalue reference to cv TR" creates 1332 // the type "lvalue reference to T", while an attempt to create the type 1333 // "rvalue reference to cv TR" creates the type TR. 1334 bool LValueRef = SpelledAsLValue || T->getAs<LValueReferenceType>(); 1335 1336 // C++ [dcl.ref]p4: There shall be no references to references. 1337 // 1338 // According to C++ DR 106, references to references are only 1339 // diagnosed when they are written directly (e.g., "int & &"), 1340 // but not when they happen via a typedef: 1341 // 1342 // typedef int& intref; 1343 // typedef intref& intref2; 1344 // 1345 // Parser::ParseDeclaratorInternal diagnoses the case where 1346 // references are written directly; here, we handle the 1347 // collapsing of references-to-references as described in C++0x. 1348 // DR 106 and 540 introduce reference-collapsing into C++98/03. 1349 1350 // C++ [dcl.ref]p1: 1351 // A declarator that specifies the type "reference to cv void" 1352 // is ill-formed. 1353 if (T->isVoidType()) { 1354 Diag(Loc, diag::err_reference_to_void); 1355 return QualType(); 1356 } 1357 1358 // In ARC, it is forbidden to build references to unqualified pointers. 1359 if (getLangOpts().ObjCAutoRefCount) 1360 T = inferARCLifetimeForPointee(*this, T, Loc, /*reference*/ true); 1361 1362 // Handle restrict on references. 1363 if (LValueRef) 1364 return Context.getLValueReferenceType(T, SpelledAsLValue); 1365 return Context.getRValueReferenceType(T); 1366} 1367 1368/// Check whether the specified array size makes the array type a VLA. If so, 1369/// return true, if not, return the size of the array in SizeVal. 1370static bool isArraySizeVLA(Sema &S, Expr *ArraySize, llvm::APSInt &SizeVal) { 1371 // If the size is an ICE, it certainly isn't a VLA. If we're in a GNU mode 1372 // (like gnu99, but not c99) accept any evaluatable value as an extension. 1373 class VLADiagnoser : public Sema::VerifyICEDiagnoser { 1374 public: 1375 VLADiagnoser() : Sema::VerifyICEDiagnoser(true) {} 1376 1377 virtual void diagnoseNotICE(Sema &S, SourceLocation Loc, SourceRange SR) { 1378 } 1379 1380 virtual void diagnoseFold(Sema &S, SourceLocation Loc, SourceRange SR) { 1381 S.Diag(Loc, diag::ext_vla_folded_to_constant) << SR; 1382 } 1383 } Diagnoser; 1384 1385 return S.VerifyIntegerConstantExpression(ArraySize, &SizeVal, Diagnoser, 1386 S.LangOpts.GNUMode).isInvalid(); 1387} 1388 1389 1390/// \brief Build an array type. 1391/// 1392/// \param T The type of each element in the array. 1393/// 1394/// \param ASM C99 array size modifier (e.g., '*', 'static'). 1395/// 1396/// \param ArraySize Expression describing the size of the array. 1397/// 1398/// \param Brackets The range from the opening '[' to the closing ']'. 1399/// 1400/// \param Entity The name of the entity that involves the array 1401/// type, if known. 1402/// 1403/// \returns A suitable array type, if there are no errors. Otherwise, 1404/// returns a NULL type. 1405QualType Sema::BuildArrayType(QualType T, ArrayType::ArraySizeModifier ASM, 1406 Expr *ArraySize, unsigned Quals, 1407 SourceRange Brackets, DeclarationName Entity) { 1408 1409 SourceLocation Loc = Brackets.getBegin(); 1410 if (getLangOpts().CPlusPlus) { 1411 // C++ [dcl.array]p1: 1412 // T is called the array element type; this type shall not be a reference 1413 // type, the (possibly cv-qualified) type void, a function type or an 1414 // abstract class type. 1415 // 1416 // C++ [dcl.array]p3: 1417 // When several "array of" specifications are adjacent, [...] only the 1418 // first of the constant expressions that specify the bounds of the arrays 1419 // may be omitted. 1420 // 1421 // Note: function types are handled in the common path with C. 1422 if (T->isReferenceType()) { 1423 Diag(Loc, diag::err_illegal_decl_array_of_references) 1424 << getPrintableNameForEntity(Entity) << T; 1425 return QualType(); 1426 } 1427 1428 if (T->isVoidType() || T->isIncompleteArrayType()) { 1429 Diag(Loc, diag::err_illegal_decl_array_incomplete_type) << T; 1430 return QualType(); 1431 } 1432 1433 if (RequireNonAbstractType(Brackets.getBegin(), T, 1434 diag::err_array_of_abstract_type)) 1435 return QualType(); 1436 1437 } else { 1438 // C99 6.7.5.2p1: If the element type is an incomplete or function type, 1439 // reject it (e.g. void ary[7], struct foo ary[7], void ary[7]()) 1440 if (RequireCompleteType(Loc, T, 1441 diag::err_illegal_decl_array_incomplete_type)) 1442 return QualType(); 1443 } 1444 1445 if (T->isFunctionType()) { 1446 Diag(Loc, diag::err_illegal_decl_array_of_functions) 1447 << getPrintableNameForEntity(Entity) << T; 1448 return QualType(); 1449 } 1450 1451 if (T->getContainedAutoType()) { 1452 Diag(Loc, diag::err_illegal_decl_array_of_auto) 1453 << getPrintableNameForEntity(Entity) << T; 1454 return QualType(); 1455 } 1456 1457 if (const RecordType *EltTy = T->getAs<RecordType>()) { 1458 // If the element type is a struct or union that contains a variadic 1459 // array, accept it as a GNU extension: C99 6.7.2.1p2. 1460 if (EltTy->getDecl()->hasFlexibleArrayMember()) 1461 Diag(Loc, diag::ext_flexible_array_in_array) << T; 1462 } else if (T->isObjCObjectType()) { 1463 Diag(Loc, diag::err_objc_array_of_interfaces) << T; 1464 return QualType(); 1465 } 1466 1467 // Do placeholder conversions on the array size expression. 1468 if (ArraySize && ArraySize->hasPlaceholderType()) { 1469 ExprResult Result = CheckPlaceholderExpr(ArraySize); 1470 if (Result.isInvalid()) return QualType(); 1471 ArraySize = Result.take(); 1472 } 1473 1474 // Do lvalue-to-rvalue conversions on the array size expression. 1475 if (ArraySize && !ArraySize->isRValue()) { 1476 ExprResult Result = DefaultLvalueConversion(ArraySize); 1477 if (Result.isInvalid()) 1478 return QualType(); 1479 1480 ArraySize = Result.take(); 1481 } 1482 1483 // C99 6.7.5.2p1: The size expression shall have integer type. 1484 // C++11 allows contextual conversions to such types. 1485 if (!getLangOpts().CPlusPlus11 && 1486 ArraySize && !ArraySize->isTypeDependent() && 1487 !ArraySize->getType()->isIntegralOrUnscopedEnumerationType()) { 1488 Diag(ArraySize->getLocStart(), diag::err_array_size_non_int) 1489 << ArraySize->getType() << ArraySize->getSourceRange(); 1490 return QualType(); 1491 } 1492 1493 llvm::APSInt ConstVal(Context.getTypeSize(Context.getSizeType())); 1494 if (!ArraySize) { 1495 if (ASM == ArrayType::Star) 1496 T = Context.getVariableArrayType(T, 0, ASM, Quals, Brackets); 1497 else 1498 T = Context.getIncompleteArrayType(T, ASM, Quals); 1499 } else if (ArraySize->isTypeDependent() || ArraySize->isValueDependent()) { 1500 T = Context.getDependentSizedArrayType(T, ArraySize, ASM, Quals, Brackets); 1501 } else if ((!T->isDependentType() && !T->isIncompleteType() && 1502 !T->isConstantSizeType()) || 1503 isArraySizeVLA(*this, ArraySize, ConstVal)) { 1504 // Even in C++11, don't allow contextual conversions in the array bound 1505 // of a VLA. 1506 if (getLangOpts().CPlusPlus11 && 1507 !ArraySize->getType()->isIntegralOrUnscopedEnumerationType()) { 1508 Diag(ArraySize->getLocStart(), diag::err_array_size_non_int) 1509 << ArraySize->getType() << ArraySize->getSourceRange(); 1510 return QualType(); 1511 } 1512 1513 // C99: an array with an element type that has a non-constant-size is a VLA. 1514 // C99: an array with a non-ICE size is a VLA. We accept any expression 1515 // that we can fold to a non-zero positive value as an extension. 1516 T = Context.getVariableArrayType(T, ArraySize, ASM, Quals, Brackets); 1517 } else { 1518 // C99 6.7.5.2p1: If the expression is a constant expression, it shall 1519 // have a value greater than zero. 1520 if (ConstVal.isSigned() && ConstVal.isNegative()) { 1521 if (Entity) 1522 Diag(ArraySize->getLocStart(), diag::err_decl_negative_array_size) 1523 << getPrintableNameForEntity(Entity) << ArraySize->getSourceRange(); 1524 else 1525 Diag(ArraySize->getLocStart(), diag::err_typecheck_negative_array_size) 1526 << ArraySize->getSourceRange(); 1527 return QualType(); 1528 } 1529 if (ConstVal == 0) { 1530 // GCC accepts zero sized static arrays. We allow them when 1531 // we're not in a SFINAE context. 1532 Diag(ArraySize->getLocStart(), 1533 isSFINAEContext()? diag::err_typecheck_zero_array_size 1534 : diag::ext_typecheck_zero_array_size) 1535 << ArraySize->getSourceRange(); 1536 1537 if (ASM == ArrayType::Static) { 1538 Diag(ArraySize->getLocStart(), 1539 diag::warn_typecheck_zero_static_array_size) 1540 << ArraySize->getSourceRange(); 1541 ASM = ArrayType::Normal; 1542 } 1543 } else if (!T->isDependentType() && !T->isVariablyModifiedType() && 1544 !T->isIncompleteType()) { 1545 // Is the array too large? 1546 unsigned ActiveSizeBits 1547 = ConstantArrayType::getNumAddressingBits(Context, T, ConstVal); 1548 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) 1549 Diag(ArraySize->getLocStart(), diag::err_array_too_large) 1550 << ConstVal.toString(10) 1551 << ArraySize->getSourceRange(); 1552 } 1553 1554 T = Context.getConstantArrayType(T, ConstVal, ASM, Quals); 1555 } 1556 1557 // OpenCL v1.2 s6.9.d: variable length arrays are not supported. 1558 if (getLangOpts().OpenCL && T->isVariableArrayType()) { 1559 Diag(Loc, diag::err_opencl_vla); 1560 return QualType(); 1561 } 1562 // If this is not C99, extwarn about VLA's and C99 array size modifiers. 1563 if (!getLangOpts().C99) { 1564 if (T->isVariableArrayType()) { 1565 // Prohibit the use of non-POD types in VLAs. 1566 QualType BaseT = Context.getBaseElementType(T); 1567 if (!T->isDependentType() && 1568 !BaseT.isPODType(Context) && 1569 !BaseT->isObjCLifetimeType()) { 1570 Diag(Loc, diag::err_vla_non_pod) 1571 << BaseT; 1572 return QualType(); 1573 } 1574 // Prohibit the use of VLAs during template argument deduction. 1575 else if (isSFINAEContext()) { 1576 Diag(Loc, diag::err_vla_in_sfinae); 1577 return QualType(); 1578 } 1579 // Just extwarn about VLAs. 1580 else 1581 Diag(Loc, diag::ext_vla); 1582 } else if (ASM != ArrayType::Normal || Quals != 0) 1583 Diag(Loc, 1584 getLangOpts().CPlusPlus? diag::err_c99_array_usage_cxx 1585 : diag::ext_c99_array_usage) << ASM; 1586 } 1587 1588 if (T->isVariableArrayType()) { 1589 // Warn about VLAs for -Wvla. 1590 Diag(Loc, diag::warn_vla_used); 1591 } 1592 1593 return T; 1594} 1595 1596/// \brief Build an ext-vector type. 1597/// 1598/// Run the required checks for the extended vector type. 1599QualType Sema::BuildExtVectorType(QualType T, Expr *ArraySize, 1600 SourceLocation AttrLoc) { 1601 // unlike gcc's vector_size attribute, we do not allow vectors to be defined 1602 // in conjunction with complex types (pointers, arrays, functions, etc.). 1603 if (!T->isDependentType() && 1604 !T->isIntegerType() && !T->isRealFloatingType()) { 1605 Diag(AttrLoc, diag::err_attribute_invalid_vector_type) << T; 1606 return QualType(); 1607 } 1608 1609 if (!ArraySize->isTypeDependent() && !ArraySize->isValueDependent()) { 1610 llvm::APSInt vecSize(32); 1611 if (!ArraySize->isIntegerConstantExpr(vecSize, Context)) { 1612 Diag(AttrLoc, diag::err_attribute_argument_not_int) 1613 << "ext_vector_type" << ArraySize->getSourceRange(); 1614 return QualType(); 1615 } 1616 1617 // unlike gcc's vector_size attribute, the size is specified as the 1618 // number of elements, not the number of bytes. 1619 unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue()); 1620 1621 if (vectorSize == 0) { 1622 Diag(AttrLoc, diag::err_attribute_zero_size) 1623 << ArraySize->getSourceRange(); 1624 return QualType(); 1625 } 1626 1627 return Context.getExtVectorType(T, vectorSize); 1628 } 1629 1630 return Context.getDependentSizedExtVectorType(T, ArraySize, AttrLoc); 1631} 1632 1633/// \brief Build a function type. 1634/// 1635/// This routine checks the function type according to C++ rules and 1636/// under the assumption that the result type and parameter types have 1637/// just been instantiated from a template. It therefore duplicates 1638/// some of the behavior of GetTypeForDeclarator, but in a much 1639/// simpler form that is only suitable for this narrow use case. 1640/// 1641/// \param T The return type of the function. 1642/// 1643/// \param ParamTypes The parameter types of the function. This array 1644/// will be modified to account for adjustments to the types of the 1645/// function parameters. 1646/// 1647/// \param NumParamTypes The number of parameter types in ParamTypes. 1648/// 1649/// \param Variadic Whether this is a variadic function type. 1650/// 1651/// \param HasTrailingReturn Whether this function has a trailing return type. 1652/// 1653/// \param Quals The cvr-qualifiers to be applied to the function type. 1654/// 1655/// \param Loc The location of the entity whose type involves this 1656/// function type or, if there is no such entity, the location of the 1657/// type that will have function type. 1658/// 1659/// \param Entity The name of the entity that involves the function 1660/// type, if known. 1661/// 1662/// \returns A suitable function type, if there are no 1663/// errors. Otherwise, returns a NULL type. 1664QualType Sema::BuildFunctionType(QualType T, 1665 QualType *ParamTypes, 1666 unsigned NumParamTypes, 1667 bool Variadic, bool HasTrailingReturn, 1668 unsigned Quals, 1669 RefQualifierKind RefQualifier, 1670 SourceLocation Loc, DeclarationName Entity, 1671 FunctionType::ExtInfo Info) { 1672 if (T->isArrayType() || T->isFunctionType()) { 1673 Diag(Loc, diag::err_func_returning_array_function) 1674 << T->isFunctionType() << T; 1675 return QualType(); 1676 } 1677 1678 // Functions cannot return half FP. 1679 if (T->isHalfType()) { 1680 Diag(Loc, diag::err_parameters_retval_cannot_have_fp16_type) << 1 << 1681 FixItHint::CreateInsertion(Loc, "*"); 1682 return QualType(); 1683 } 1684 1685 bool Invalid = false; 1686 for (unsigned Idx = 0; Idx < NumParamTypes; ++Idx) { 1687 // FIXME: Loc is too inprecise here, should use proper locations for args. 1688 QualType ParamType = Context.getAdjustedParameterType(ParamTypes[Idx]); 1689 if (ParamType->isVoidType()) { 1690 Diag(Loc, diag::err_param_with_void_type); 1691 Invalid = true; 1692 } else if (ParamType->isHalfType()) { 1693 // Disallow half FP arguments. 1694 Diag(Loc, diag::err_parameters_retval_cannot_have_fp16_type) << 0 << 1695 FixItHint::CreateInsertion(Loc, "*"); 1696 Invalid = true; 1697 } 1698 1699 ParamTypes[Idx] = ParamType; 1700 } 1701 1702 if (Invalid) 1703 return QualType(); 1704 1705 FunctionProtoType::ExtProtoInfo EPI; 1706 EPI.Variadic = Variadic; 1707 EPI.HasTrailingReturn = HasTrailingReturn; 1708 EPI.TypeQuals = Quals; 1709 EPI.RefQualifier = RefQualifier; 1710 EPI.ExtInfo = Info; 1711 1712 return Context.getFunctionType(T, ParamTypes, NumParamTypes, EPI); 1713} 1714 1715/// \brief Build a member pointer type \c T Class::*. 1716/// 1717/// \param T the type to which the member pointer refers. 1718/// \param Class the class type into which the member pointer points. 1719/// \param Loc the location where this type begins 1720/// \param Entity the name of the entity that will have this member pointer type 1721/// 1722/// \returns a member pointer type, if successful, or a NULL type if there was 1723/// an error. 1724QualType Sema::BuildMemberPointerType(QualType T, QualType Class, 1725 SourceLocation Loc, 1726 DeclarationName Entity) { 1727 // Verify that we're not building a pointer to pointer to function with 1728 // exception specification. 1729 if (CheckDistantExceptionSpec(T)) { 1730 Diag(Loc, diag::err_distant_exception_spec); 1731 1732 // FIXME: If we're doing this as part of template instantiation, 1733 // we should return immediately. 1734 1735 // Build the type anyway, but use the canonical type so that the 1736 // exception specifiers are stripped off. 1737 T = Context.getCanonicalType(T); 1738 } 1739 1740 // C++ 8.3.3p3: A pointer to member shall not point to ... a member 1741 // with reference type, or "cv void." 1742 if (T->isReferenceType()) { 1743 Diag(Loc, diag::err_illegal_decl_mempointer_to_reference) 1744 << (Entity? Entity.getAsString() : "type name") << T; 1745 return QualType(); 1746 } 1747 1748 if (T->isVoidType()) { 1749 Diag(Loc, diag::err_illegal_decl_mempointer_to_void) 1750 << (Entity? Entity.getAsString() : "type name"); 1751 return QualType(); 1752 } 1753 1754 if (!Class->isDependentType() && !Class->isRecordType()) { 1755 Diag(Loc, diag::err_mempointer_in_nonclass_type) << Class; 1756 return QualType(); 1757 } 1758 1759 // C++ allows the class type in a member pointer to be an incomplete type. 1760 // In the Microsoft ABI, the size of the member pointer can vary 1761 // according to the class type, which means that we really need a 1762 // complete type if possible, which means we need to instantiate templates. 1763 // 1764 // For now, just require a complete type, which will instantiate 1765 // templates. This will also error if the type is just forward-declared, 1766 // which is a bug, but it's a bug that saves us from dealing with some 1767 // complexities at the moment. 1768 if (Context.getTargetInfo().getCXXABI().isMicrosoft() && 1769 RequireCompleteType(Loc, Class, diag::err_incomplete_type)) 1770 return QualType(); 1771 1772 return Context.getMemberPointerType(T, Class.getTypePtr()); 1773} 1774 1775/// \brief Build a block pointer type. 1776/// 1777/// \param T The type to which we'll be building a block pointer. 1778/// 1779/// \param Loc The source location, used for diagnostics. 1780/// 1781/// \param Entity The name of the entity that involves the block pointer 1782/// type, if known. 1783/// 1784/// \returns A suitable block pointer type, if there are no 1785/// errors. Otherwise, returns a NULL type. 1786QualType Sema::BuildBlockPointerType(QualType T, 1787 SourceLocation Loc, 1788 DeclarationName Entity) { 1789 if (!T->isFunctionType()) { 1790 Diag(Loc, diag::err_nonfunction_block_type); 1791 return QualType(); 1792 } 1793 1794 return Context.getBlockPointerType(T); 1795} 1796 1797QualType Sema::GetTypeFromParser(ParsedType Ty, TypeSourceInfo **TInfo) { 1798 QualType QT = Ty.get(); 1799 if (QT.isNull()) { 1800 if (TInfo) *TInfo = 0; 1801 return QualType(); 1802 } 1803 1804 TypeSourceInfo *DI = 0; 1805 if (const LocInfoType *LIT = dyn_cast<LocInfoType>(QT)) { 1806 QT = LIT->getType(); 1807 DI = LIT->getTypeSourceInfo(); 1808 } 1809 1810 if (TInfo) *TInfo = DI; 1811 return QT; 1812} 1813 1814static void transferARCOwnershipToDeclaratorChunk(TypeProcessingState &state, 1815 Qualifiers::ObjCLifetime ownership, 1816 unsigned chunkIndex); 1817 1818/// Given that this is the declaration of a parameter under ARC, 1819/// attempt to infer attributes and such for pointer-to-whatever 1820/// types. 1821static void inferARCWriteback(TypeProcessingState &state, 1822 QualType &declSpecType) { 1823 Sema &S = state.getSema(); 1824 Declarator &declarator = state.getDeclarator(); 1825 1826 // TODO: should we care about decl qualifiers? 1827 1828 // Check whether the declarator has the expected form. We walk 1829 // from the inside out in order to make the block logic work. 1830 unsigned outermostPointerIndex = 0; 1831 bool isBlockPointer = false; 1832 unsigned numPointers = 0; 1833 for (unsigned i = 0, e = declarator.getNumTypeObjects(); i != e; ++i) { 1834 unsigned chunkIndex = i; 1835 DeclaratorChunk &chunk = declarator.getTypeObject(chunkIndex); 1836 switch (chunk.Kind) { 1837 case DeclaratorChunk::Paren: 1838 // Ignore parens. 1839 break; 1840 1841 case DeclaratorChunk::Reference: 1842 case DeclaratorChunk::Pointer: 1843 // Count the number of pointers. Treat references 1844 // interchangeably as pointers; if they're mis-ordered, normal 1845 // type building will discover that. 1846 outermostPointerIndex = chunkIndex; 1847 numPointers++; 1848 break; 1849 1850 case DeclaratorChunk::BlockPointer: 1851 // If we have a pointer to block pointer, that's an acceptable 1852 // indirect reference; anything else is not an application of 1853 // the rules. 1854 if (numPointers != 1) return; 1855 numPointers++; 1856 outermostPointerIndex = chunkIndex; 1857 isBlockPointer = true; 1858 1859 // We don't care about pointer structure in return values here. 1860 goto done; 1861 1862 case DeclaratorChunk::Array: // suppress if written (id[])? 1863 case DeclaratorChunk::Function: 1864 case DeclaratorChunk::MemberPointer: 1865 return; 1866 } 1867 } 1868 done: 1869 1870 // If we have *one* pointer, then we want to throw the qualifier on 1871 // the declaration-specifiers, which means that it needs to be a 1872 // retainable object type. 1873 if (numPointers == 1) { 1874 // If it's not a retainable object type, the rule doesn't apply. 1875 if (!declSpecType->isObjCRetainableType()) return; 1876 1877 // If it already has lifetime, don't do anything. 1878 if (declSpecType.getObjCLifetime()) return; 1879 1880 // Otherwise, modify the type in-place. 1881 Qualifiers qs; 1882 1883 if (declSpecType->isObjCARCImplicitlyUnretainedType()) 1884 qs.addObjCLifetime(Qualifiers::OCL_ExplicitNone); 1885 else 1886 qs.addObjCLifetime(Qualifiers::OCL_Autoreleasing); 1887 declSpecType = S.Context.getQualifiedType(declSpecType, qs); 1888 1889 // If we have *two* pointers, then we want to throw the qualifier on 1890 // the outermost pointer. 1891 } else if (numPointers == 2) { 1892 // If we don't have a block pointer, we need to check whether the 1893 // declaration-specifiers gave us something that will turn into a 1894 // retainable object pointer after we slap the first pointer on it. 1895 if (!isBlockPointer && !declSpecType->isObjCObjectType()) 1896 return; 1897 1898 // Look for an explicit lifetime attribute there. 1899 DeclaratorChunk &chunk = declarator.getTypeObject(outermostPointerIndex); 1900 if (chunk.Kind != DeclaratorChunk::Pointer && 1901 chunk.Kind != DeclaratorChunk::BlockPointer) 1902 return; 1903 for (const AttributeList *attr = chunk.getAttrs(); attr; 1904 attr = attr->getNext()) 1905 if (attr->getKind() == AttributeList::AT_ObjCOwnership) 1906 return; 1907 1908 transferARCOwnershipToDeclaratorChunk(state, Qualifiers::OCL_Autoreleasing, 1909 outermostPointerIndex); 1910 1911 // Any other number of pointers/references does not trigger the rule. 1912 } else return; 1913 1914 // TODO: mark whether we did this inference? 1915} 1916 1917static void DiagnoseIgnoredQualifiers(unsigned Quals, 1918 SourceLocation ConstQualLoc, 1919 SourceLocation VolatileQualLoc, 1920 SourceLocation RestrictQualLoc, 1921 Sema& S) { 1922 std::string QualStr; 1923 unsigned NumQuals = 0; 1924 SourceLocation Loc; 1925 1926 FixItHint ConstFixIt; 1927 FixItHint VolatileFixIt; 1928 FixItHint RestrictFixIt; 1929 1930 const SourceManager &SM = S.getSourceManager(); 1931 1932 // FIXME: The locations here are set kind of arbitrarily. It'd be nicer to 1933 // find a range and grow it to encompass all the qualifiers, regardless of 1934 // the order in which they textually appear. 1935 if (Quals & Qualifiers::Const) { 1936 ConstFixIt = FixItHint::CreateRemoval(ConstQualLoc); 1937 QualStr = "const"; 1938 ++NumQuals; 1939 if (!Loc.isValid() || SM.isBeforeInTranslationUnit(ConstQualLoc, Loc)) 1940 Loc = ConstQualLoc; 1941 } 1942 if (Quals & Qualifiers::Volatile) { 1943 VolatileFixIt = FixItHint::CreateRemoval(VolatileQualLoc); 1944 QualStr += (NumQuals == 0 ? "volatile" : " volatile"); 1945 ++NumQuals; 1946 if (!Loc.isValid() || SM.isBeforeInTranslationUnit(VolatileQualLoc, Loc)) 1947 Loc = VolatileQualLoc; 1948 } 1949 if (Quals & Qualifiers::Restrict) { 1950 RestrictFixIt = FixItHint::CreateRemoval(RestrictQualLoc); 1951 QualStr += (NumQuals == 0 ? "restrict" : " restrict"); 1952 ++NumQuals; 1953 if (!Loc.isValid() || SM.isBeforeInTranslationUnit(RestrictQualLoc, Loc)) 1954 Loc = RestrictQualLoc; 1955 } 1956 1957 assert(NumQuals > 0 && "No known qualifiers?"); 1958 1959 S.Diag(Loc, diag::warn_qual_return_type) 1960 << QualStr << NumQuals << ConstFixIt << VolatileFixIt << RestrictFixIt; 1961} 1962 1963static QualType GetDeclSpecTypeForDeclarator(TypeProcessingState &state, 1964 TypeSourceInfo *&ReturnTypeInfo) { 1965 Sema &SemaRef = state.getSema(); 1966 Declarator &D = state.getDeclarator(); 1967 QualType T; 1968 ReturnTypeInfo = 0; 1969 1970 // The TagDecl owned by the DeclSpec. 1971 TagDecl *OwnedTagDecl = 0; 1972 1973 switch (D.getName().getKind()) { 1974 case UnqualifiedId::IK_ImplicitSelfParam: 1975 case UnqualifiedId::IK_OperatorFunctionId: 1976 case UnqualifiedId::IK_Identifier: 1977 case UnqualifiedId::IK_LiteralOperatorId: 1978 case UnqualifiedId::IK_TemplateId: 1979 T = ConvertDeclSpecToType(state); 1980 1981 if (!D.isInvalidType() && D.getDeclSpec().isTypeSpecOwned()) { 1982 OwnedTagDecl = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 1983 // Owned declaration is embedded in declarator. 1984 OwnedTagDecl->setEmbeddedInDeclarator(true); 1985 } 1986 break; 1987 1988 case UnqualifiedId::IK_ConstructorName: 1989 case UnqualifiedId::IK_ConstructorTemplateId: 1990 case UnqualifiedId::IK_DestructorName: 1991 // Constructors and destructors don't have return types. Use 1992 // "void" instead. 1993 T = SemaRef.Context.VoidTy; 1994 if (AttributeList *attrs = D.getDeclSpec().getAttributes().getList()) 1995 processTypeAttrs(state, T, TAL_DeclSpec, attrs); 1996 break; 1997 1998 case UnqualifiedId::IK_ConversionFunctionId: 1999 // The result type of a conversion function is the type that it 2000 // converts to. 2001 T = SemaRef.GetTypeFromParser(D.getName().ConversionFunctionId, 2002 &ReturnTypeInfo); 2003 break; 2004 } 2005 2006 if (D.getAttributes()) 2007 distributeTypeAttrsFromDeclarator(state, T); 2008 2009 // C++11 [dcl.spec.auto]p5: reject 'auto' if it is not in an allowed context. 2010 // In C++11, a function declarator using 'auto' must have a trailing return 2011 // type (this is checked later) and we can skip this. In other languages 2012 // using auto, we need to check regardless. 2013 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto && 2014 (!SemaRef.getLangOpts().CPlusPlus11 || !D.isFunctionDeclarator())) { 2015 int Error = -1; 2016 2017 switch (D.getContext()) { 2018 case Declarator::KNRTypeListContext: 2019 llvm_unreachable("K&R type lists aren't allowed in C++"); 2020 case Declarator::LambdaExprContext: 2021 llvm_unreachable("Can't specify a type specifier in lambda grammar"); 2022 case Declarator::ObjCParameterContext: 2023 case Declarator::ObjCResultContext: 2024 case Declarator::PrototypeContext: 2025 Error = 0; // Function prototype 2026 break; 2027 case Declarator::MemberContext: 2028 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_static) 2029 break; 2030 switch (cast<TagDecl>(SemaRef.CurContext)->getTagKind()) { 2031 case TTK_Enum: llvm_unreachable("unhandled tag kind"); 2032 case TTK_Struct: Error = 1; /* Struct member */ break; 2033 case TTK_Union: Error = 2; /* Union member */ break; 2034 case TTK_Class: Error = 3; /* Class member */ break; 2035 case TTK_Interface: Error = 4; /* Interface member */ break; 2036 } 2037 break; 2038 case Declarator::CXXCatchContext: 2039 case Declarator::ObjCCatchContext: 2040 Error = 5; // Exception declaration 2041 break; 2042 case Declarator::TemplateParamContext: 2043 Error = 6; // Template parameter 2044 break; 2045 case Declarator::BlockLiteralContext: 2046 Error = 7; // Block literal 2047 break; 2048 case Declarator::TemplateTypeArgContext: 2049 Error = 8; // Template type argument 2050 break; 2051 case Declarator::AliasDeclContext: 2052 case Declarator::AliasTemplateContext: 2053 Error = 10; // Type alias 2054 break; 2055 case Declarator::TrailingReturnContext: 2056 Error = 11; // Function return type 2057 break; 2058 case Declarator::TypeNameContext: 2059 Error = 12; // Generic 2060 break; 2061 case Declarator::FileContext: 2062 case Declarator::BlockContext: 2063 case Declarator::ForContext: 2064 case Declarator::ConditionContext: 2065 case Declarator::CXXNewContext: 2066 break; 2067 } 2068 2069 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 2070 Error = 9; 2071 2072 // In Objective-C it is an error to use 'auto' on a function declarator. 2073 if (D.isFunctionDeclarator()) 2074 Error = 11; 2075 2076 // C++11 [dcl.spec.auto]p2: 'auto' is always fine if the declarator 2077 // contains a trailing return type. That is only legal at the outermost 2078 // level. Check all declarator chunks (outermost first) anyway, to give 2079 // better diagnostics. 2080 if (SemaRef.getLangOpts().CPlusPlus11 && Error != -1) { 2081 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 2082 unsigned chunkIndex = e - i - 1; 2083 state.setCurrentChunkIndex(chunkIndex); 2084 DeclaratorChunk &DeclType = D.getTypeObject(chunkIndex); 2085 if (DeclType.Kind == DeclaratorChunk::Function) { 2086 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun; 2087 if (FTI.hasTrailingReturnType()) { 2088 Error = -1; 2089 break; 2090 } 2091 } 2092 } 2093 } 2094 2095 if (Error != -1) { 2096 SemaRef.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 2097 diag::err_auto_not_allowed) 2098 << Error; 2099 T = SemaRef.Context.IntTy; 2100 D.setInvalidType(true); 2101 } else 2102 SemaRef.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 2103 diag::warn_cxx98_compat_auto_type_specifier); 2104 } 2105 2106 if (SemaRef.getLangOpts().CPlusPlus && 2107 OwnedTagDecl && OwnedTagDecl->isCompleteDefinition()) { 2108 // Check the contexts where C++ forbids the declaration of a new class 2109 // or enumeration in a type-specifier-seq. 2110 switch (D.getContext()) { 2111 case Declarator::TrailingReturnContext: 2112 // Class and enumeration definitions are syntactically not allowed in 2113 // trailing return types. 2114 llvm_unreachable("parser should not have allowed this"); 2115 break; 2116 case Declarator::FileContext: 2117 case Declarator::MemberContext: 2118 case Declarator::BlockContext: 2119 case Declarator::ForContext: 2120 case Declarator::BlockLiteralContext: 2121 case Declarator::LambdaExprContext: 2122 // C++11 [dcl.type]p3: 2123 // A type-specifier-seq shall not define a class or enumeration unless 2124 // it appears in the type-id of an alias-declaration (7.1.3) that is not 2125 // the declaration of a template-declaration. 2126 case Declarator::AliasDeclContext: 2127 break; 2128 case Declarator::AliasTemplateContext: 2129 SemaRef.Diag(OwnedTagDecl->getLocation(), 2130 diag::err_type_defined_in_alias_template) 2131 << SemaRef.Context.getTypeDeclType(OwnedTagDecl); 2132 D.setInvalidType(true); 2133 break; 2134 case Declarator::TypeNameContext: 2135 case Declarator::TemplateParamContext: 2136 case Declarator::CXXNewContext: 2137 case Declarator::CXXCatchContext: 2138 case Declarator::ObjCCatchContext: 2139 case Declarator::TemplateTypeArgContext: 2140 SemaRef.Diag(OwnedTagDecl->getLocation(), 2141 diag::err_type_defined_in_type_specifier) 2142 << SemaRef.Context.getTypeDeclType(OwnedTagDecl); 2143 D.setInvalidType(true); 2144 break; 2145 case Declarator::PrototypeContext: 2146 case Declarator::ObjCParameterContext: 2147 case Declarator::ObjCResultContext: 2148 case Declarator::KNRTypeListContext: 2149 // C++ [dcl.fct]p6: 2150 // Types shall not be defined in return or parameter types. 2151 SemaRef.Diag(OwnedTagDecl->getLocation(), 2152 diag::err_type_defined_in_param_type) 2153 << SemaRef.Context.getTypeDeclType(OwnedTagDecl); 2154 D.setInvalidType(true); 2155 break; 2156 case Declarator::ConditionContext: 2157 // C++ 6.4p2: 2158 // The type-specifier-seq shall not contain typedef and shall not declare 2159 // a new class or enumeration. 2160 SemaRef.Diag(OwnedTagDecl->getLocation(), 2161 diag::err_type_defined_in_condition); 2162 D.setInvalidType(true); 2163 break; 2164 } 2165 } 2166 2167 return T; 2168} 2169 2170static std::string getFunctionQualifiersAsString(const FunctionProtoType *FnTy){ 2171 std::string Quals = 2172 Qualifiers::fromCVRMask(FnTy->getTypeQuals()).getAsString(); 2173 2174 switch (FnTy->getRefQualifier()) { 2175 case RQ_None: 2176 break; 2177 2178 case RQ_LValue: 2179 if (!Quals.empty()) 2180 Quals += ' '; 2181 Quals += '&'; 2182 break; 2183 2184 case RQ_RValue: 2185 if (!Quals.empty()) 2186 Quals += ' '; 2187 Quals += "&&"; 2188 break; 2189 } 2190 2191 return Quals; 2192} 2193 2194/// Check that the function type T, which has a cv-qualifier or a ref-qualifier, 2195/// can be contained within the declarator chunk DeclType, and produce an 2196/// appropriate diagnostic if not. 2197static void checkQualifiedFunction(Sema &S, QualType T, 2198 DeclaratorChunk &DeclType) { 2199 // C++98 [dcl.fct]p4 / C++11 [dcl.fct]p6: a function type with a 2200 // cv-qualifier or a ref-qualifier can only appear at the topmost level 2201 // of a type. 2202 int DiagKind = -1; 2203 switch (DeclType.Kind) { 2204 case DeclaratorChunk::Paren: 2205 case DeclaratorChunk::MemberPointer: 2206 // These cases are permitted. 2207 return; 2208 case DeclaratorChunk::Array: 2209 case DeclaratorChunk::Function: 2210 // These cases don't allow function types at all; no need to diagnose the 2211 // qualifiers separately. 2212 return; 2213 case DeclaratorChunk::BlockPointer: 2214 DiagKind = 0; 2215 break; 2216 case DeclaratorChunk::Pointer: 2217 DiagKind = 1; 2218 break; 2219 case DeclaratorChunk::Reference: 2220 DiagKind = 2; 2221 break; 2222 } 2223 2224 assert(DiagKind != -1); 2225 S.Diag(DeclType.Loc, diag::err_compound_qualified_function_type) 2226 << DiagKind << isa<FunctionType>(T.IgnoreParens()) << T 2227 << getFunctionQualifiersAsString(T->castAs<FunctionProtoType>()); 2228} 2229 2230/// Produce an approprioate diagnostic for an ambiguity between a function 2231/// declarator and a C++ direct-initializer. 2232static void warnAboutAmbiguousFunction(Sema &S, Declarator &D, 2233 DeclaratorChunk &DeclType, QualType RT) { 2234 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun; 2235 assert(FTI.isAmbiguous && "no direct-initializer / function ambiguity"); 2236 2237 // If the return type is void there is no ambiguity. 2238 if (RT->isVoidType()) 2239 return; 2240 2241 // An initializer for a non-class type can have at most one argument. 2242 if (!RT->isRecordType() && FTI.NumArgs > 1) 2243 return; 2244 2245 // An initializer for a reference must have exactly one argument. 2246 if (RT->isReferenceType() && FTI.NumArgs != 1) 2247 return; 2248 2249 // Only warn if this declarator is declaring a function at block scope, and 2250 // doesn't have a storage class (such as 'extern') specified. 2251 if (!D.isFunctionDeclarator() || 2252 D.getFunctionDefinitionKind() != FDK_Declaration || 2253 !S.CurContext->isFunctionOrMethod() || 2254 D.getDeclSpec().getStorageClassSpecAsWritten() 2255 != DeclSpec::SCS_unspecified) 2256 return; 2257 2258 // Inside a condition, a direct initializer is not permitted. We allow one to 2259 // be parsed in order to give better diagnostics in condition parsing. 2260 if (D.getContext() == Declarator::ConditionContext) 2261 return; 2262 2263 SourceRange ParenRange(DeclType.Loc, DeclType.EndLoc); 2264 2265 S.Diag(DeclType.Loc, 2266 FTI.NumArgs ? diag::warn_parens_disambiguated_as_function_declaration 2267 : diag::warn_empty_parens_are_function_decl) 2268 << ParenRange; 2269 2270 // If the declaration looks like: 2271 // T var1, 2272 // f(); 2273 // and name lookup finds a function named 'f', then the ',' was 2274 // probably intended to be a ';'. 2275 if (!D.isFirstDeclarator() && D.getIdentifier()) { 2276 FullSourceLoc Comma(D.getCommaLoc(), S.SourceMgr); 2277 FullSourceLoc Name(D.getIdentifierLoc(), S.SourceMgr); 2278 if (Comma.getFileID() != Name.getFileID() || 2279 Comma.getSpellingLineNumber() != Name.getSpellingLineNumber()) { 2280 LookupResult Result(S, D.getIdentifier(), SourceLocation(), 2281 Sema::LookupOrdinaryName); 2282 if (S.LookupName(Result, S.getCurScope())) 2283 S.Diag(D.getCommaLoc(), diag::note_empty_parens_function_call) 2284 << FixItHint::CreateReplacement(D.getCommaLoc(), ";") 2285 << D.getIdentifier(); 2286 } 2287 } 2288 2289 if (FTI.NumArgs > 0) { 2290 // For a declaration with parameters, eg. "T var(T());", suggest adding parens 2291 // around the first parameter to turn the declaration into a variable 2292 // declaration. 2293 SourceRange Range = FTI.ArgInfo[0].Param->getSourceRange(); 2294 SourceLocation B = Range.getBegin(); 2295 SourceLocation E = S.PP.getLocForEndOfToken(Range.getEnd()); 2296 // FIXME: Maybe we should suggest adding braces instead of parens 2297 // in C++11 for classes that don't have an initializer_list constructor. 2298 S.Diag(B, diag::note_additional_parens_for_variable_declaration) 2299 << FixItHint::CreateInsertion(B, "(") 2300 << FixItHint::CreateInsertion(E, ")"); 2301 } else { 2302 // For a declaration without parameters, eg. "T var();", suggest replacing the 2303 // parens with an initializer to turn the declaration into a variable 2304 // declaration. 2305 const CXXRecordDecl *RD = RT->getAsCXXRecordDecl(); 2306 2307 // Empty parens mean value-initialization, and no parens mean 2308 // default initialization. These are equivalent if the default 2309 // constructor is user-provided or if zero-initialization is a 2310 // no-op. 2311 if (RD && RD->hasDefinition() && 2312 (RD->isEmpty() || RD->hasUserProvidedDefaultConstructor())) 2313 S.Diag(DeclType.Loc, diag::note_empty_parens_default_ctor) 2314 << FixItHint::CreateRemoval(ParenRange); 2315 else { 2316 std::string Init = S.getFixItZeroInitializerForType(RT); 2317 if (Init.empty() && S.LangOpts.CPlusPlus11) 2318 Init = "{}"; 2319 if (!Init.empty()) 2320 S.Diag(DeclType.Loc, diag::note_empty_parens_zero_initialize) 2321 << FixItHint::CreateReplacement(ParenRange, Init); 2322 } 2323 } 2324} 2325 2326static TypeSourceInfo *GetFullTypeForDeclarator(TypeProcessingState &state, 2327 QualType declSpecType, 2328 TypeSourceInfo *TInfo) { 2329 2330 QualType T = declSpecType; 2331 Declarator &D = state.getDeclarator(); 2332 Sema &S = state.getSema(); 2333 ASTContext &Context = S.Context; 2334 const LangOptions &LangOpts = S.getLangOpts(); 2335 2336 // The name we're declaring, if any. 2337 DeclarationName Name; 2338 if (D.getIdentifier()) 2339 Name = D.getIdentifier(); 2340 2341 // Does this declaration declare a typedef-name? 2342 bool IsTypedefName = 2343 D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef || 2344 D.getContext() == Declarator::AliasDeclContext || 2345 D.getContext() == Declarator::AliasTemplateContext; 2346 2347 // Does T refer to a function type with a cv-qualifier or a ref-qualifier? 2348 bool IsQualifiedFunction = T->isFunctionProtoType() && 2349 (T->castAs<FunctionProtoType>()->getTypeQuals() != 0 || 2350 T->castAs<FunctionProtoType>()->getRefQualifier() != RQ_None); 2351 2352 // Walk the DeclTypeInfo, building the recursive type as we go. 2353 // DeclTypeInfos are ordered from the identifier out, which is 2354 // opposite of what we want :). 2355 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 2356 unsigned chunkIndex = e - i - 1; 2357 state.setCurrentChunkIndex(chunkIndex); 2358 DeclaratorChunk &DeclType = D.getTypeObject(chunkIndex); 2359 if (IsQualifiedFunction) { 2360 checkQualifiedFunction(S, T, DeclType); 2361 IsQualifiedFunction = DeclType.Kind == DeclaratorChunk::Paren; 2362 } 2363 switch (DeclType.Kind) { 2364 case DeclaratorChunk::Paren: 2365 T = S.BuildParenType(T); 2366 break; 2367 case DeclaratorChunk::BlockPointer: 2368 // If blocks are disabled, emit an error. 2369 if (!LangOpts.Blocks) 2370 S.Diag(DeclType.Loc, diag::err_blocks_disable); 2371 2372 T = S.BuildBlockPointerType(T, D.getIdentifierLoc(), Name); 2373 if (DeclType.Cls.TypeQuals) 2374 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Cls.TypeQuals); 2375 break; 2376 case DeclaratorChunk::Pointer: 2377 // Verify that we're not building a pointer to pointer to function with 2378 // exception specification. 2379 if (LangOpts.CPlusPlus && S.CheckDistantExceptionSpec(T)) { 2380 S.Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 2381 D.setInvalidType(true); 2382 // Build the type anyway. 2383 } 2384 if (LangOpts.ObjC1 && T->getAs<ObjCObjectType>()) { 2385 T = Context.getObjCObjectPointerType(T); 2386 if (DeclType.Ptr.TypeQuals) 2387 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Ptr.TypeQuals); 2388 break; 2389 } 2390 T = S.BuildPointerType(T, DeclType.Loc, Name); 2391 if (DeclType.Ptr.TypeQuals) 2392 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Ptr.TypeQuals); 2393 2394 break; 2395 case DeclaratorChunk::Reference: { 2396 // Verify that we're not building a reference to pointer to function with 2397 // exception specification. 2398 if (LangOpts.CPlusPlus && S.CheckDistantExceptionSpec(T)) { 2399 S.Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 2400 D.setInvalidType(true); 2401 // Build the type anyway. 2402 } 2403 T = S.BuildReferenceType(T, DeclType.Ref.LValueRef, DeclType.Loc, Name); 2404 2405 Qualifiers Quals; 2406 if (DeclType.Ref.HasRestrict) 2407 T = S.BuildQualifiedType(T, DeclType.Loc, Qualifiers::Restrict); 2408 break; 2409 } 2410 case DeclaratorChunk::Array: { 2411 // Verify that we're not building an array of pointers to function with 2412 // exception specification. 2413 if (LangOpts.CPlusPlus && S.CheckDistantExceptionSpec(T)) { 2414 S.Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 2415 D.setInvalidType(true); 2416 // Build the type anyway. 2417 } 2418 DeclaratorChunk::ArrayTypeInfo &ATI = DeclType.Arr; 2419 Expr *ArraySize = static_cast<Expr*>(ATI.NumElts); 2420 ArrayType::ArraySizeModifier ASM; 2421 if (ATI.isStar) 2422 ASM = ArrayType::Star; 2423 else if (ATI.hasStatic) 2424 ASM = ArrayType::Static; 2425 else 2426 ASM = ArrayType::Normal; 2427 if (ASM == ArrayType::Star && !D.isPrototypeContext()) { 2428 // FIXME: This check isn't quite right: it allows star in prototypes 2429 // for function definitions, and disallows some edge cases detailed 2430 // in http://gcc.gnu.org/ml/gcc-patches/2009-02/msg00133.html 2431 S.Diag(DeclType.Loc, diag::err_array_star_outside_prototype); 2432 ASM = ArrayType::Normal; 2433 D.setInvalidType(true); 2434 } 2435 2436 // C99 6.7.5.2p1: The optional type qualifiers and the keyword static 2437 // shall appear only in a declaration of a function parameter with an 2438 // array type, ... 2439 if (ASM == ArrayType::Static || ATI.TypeQuals) { 2440 if (!(D.isPrototypeContext() || 2441 D.getContext() == Declarator::KNRTypeListContext)) { 2442 S.Diag(DeclType.Loc, diag::err_array_static_outside_prototype) << 2443 (ASM == ArrayType::Static ? "'static'" : "type qualifier"); 2444 // Remove the 'static' and the type qualifiers. 2445 if (ASM == ArrayType::Static) 2446 ASM = ArrayType::Normal; 2447 ATI.TypeQuals = 0; 2448 D.setInvalidType(true); 2449 } 2450 2451 // C99 6.7.5.2p1: ... and then only in the outermost array type 2452 // derivation. 2453 unsigned x = chunkIndex; 2454 while (x != 0) { 2455 // Walk outwards along the declarator chunks. 2456 x--; 2457 const DeclaratorChunk &DC = D.getTypeObject(x); 2458 switch (DC.Kind) { 2459 case DeclaratorChunk::Paren: 2460 continue; 2461 case DeclaratorChunk::Array: 2462 case DeclaratorChunk::Pointer: 2463 case DeclaratorChunk::Reference: 2464 case DeclaratorChunk::MemberPointer: 2465 S.Diag(DeclType.Loc, diag::err_array_static_not_outermost) << 2466 (ASM == ArrayType::Static ? "'static'" : "type qualifier"); 2467 if (ASM == ArrayType::Static) 2468 ASM = ArrayType::Normal; 2469 ATI.TypeQuals = 0; 2470 D.setInvalidType(true); 2471 break; 2472 case DeclaratorChunk::Function: 2473 case DeclaratorChunk::BlockPointer: 2474 // These are invalid anyway, so just ignore. 2475 break; 2476 } 2477 } 2478 } 2479 2480 T = S.BuildArrayType(T, ASM, ArraySize, ATI.TypeQuals, 2481 SourceRange(DeclType.Loc, DeclType.EndLoc), Name); 2482 break; 2483 } 2484 case DeclaratorChunk::Function: { 2485 // If the function declarator has a prototype (i.e. it is not () and 2486 // does not have a K&R-style identifier list), then the arguments are part 2487 // of the type, otherwise the argument list is (). 2488 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun; 2489 IsQualifiedFunction = FTI.TypeQuals || FTI.hasRefQualifier(); 2490 2491 // Check for auto functions and trailing return type and adjust the 2492 // return type accordingly. 2493 if (!D.isInvalidType()) { 2494 // trailing-return-type is only required if we're declaring a function, 2495 // and not, for instance, a pointer to a function. 2496 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto && 2497 !FTI.hasTrailingReturnType() && chunkIndex == 0) { 2498 S.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 2499 diag::err_auto_missing_trailing_return); 2500 T = Context.IntTy; 2501 D.setInvalidType(true); 2502 } else if (FTI.hasTrailingReturnType()) { 2503 // T must be exactly 'auto' at this point. See CWG issue 681. 2504 if (isa<ParenType>(T)) { 2505 S.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 2506 diag::err_trailing_return_in_parens) 2507 << T << D.getDeclSpec().getSourceRange(); 2508 D.setInvalidType(true); 2509 } else if (D.getContext() != Declarator::LambdaExprContext && 2510 (T.hasQualifiers() || !isa<AutoType>(T))) { 2511 S.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 2512 diag::err_trailing_return_without_auto) 2513 << T << D.getDeclSpec().getSourceRange(); 2514 D.setInvalidType(true); 2515 } 2516 T = S.GetTypeFromParser(FTI.getTrailingReturnType(), &TInfo); 2517 if (T.isNull()) { 2518 // An error occurred parsing the trailing return type. 2519 T = Context.IntTy; 2520 D.setInvalidType(true); 2521 } 2522 } 2523 } 2524 2525 // C99 6.7.5.3p1: The return type may not be a function or array type. 2526 // For conversion functions, we'll diagnose this particular error later. 2527 if ((T->isArrayType() || T->isFunctionType()) && 2528 (D.getName().getKind() != UnqualifiedId::IK_ConversionFunctionId)) { 2529 unsigned diagID = diag::err_func_returning_array_function; 2530 // Last processing chunk in block context means this function chunk 2531 // represents the block. 2532 if (chunkIndex == 0 && 2533 D.getContext() == Declarator::BlockLiteralContext) 2534 diagID = diag::err_block_returning_array_function; 2535 S.Diag(DeclType.Loc, diagID) << T->isFunctionType() << T; 2536 T = Context.IntTy; 2537 D.setInvalidType(true); 2538 } 2539 2540 // Do not allow returning half FP value. 2541 // FIXME: This really should be in BuildFunctionType. 2542 if (T->isHalfType()) { 2543 if (S.getLangOpts().OpenCL) { 2544 if (!S.getOpenCLOptions().cl_khr_fp16) { 2545 S.Diag(D.getIdentifierLoc(), diag::err_opencl_half_return) << T; 2546 D.setInvalidType(true); 2547 } 2548 } else { 2549 S.Diag(D.getIdentifierLoc(), 2550 diag::err_parameters_retval_cannot_have_fp16_type) << 1; 2551 D.setInvalidType(true); 2552 } 2553 } 2554 2555 // cv-qualifiers on return types are pointless except when the type is a 2556 // class type in C++. 2557 if (isa<PointerType>(T) && T.getLocalCVRQualifiers() && 2558 (D.getName().getKind() != UnqualifiedId::IK_ConversionFunctionId) && 2559 (!LangOpts.CPlusPlus || !T->isDependentType())) { 2560 assert(chunkIndex + 1 < e && "No DeclaratorChunk for the return type?"); 2561 DeclaratorChunk ReturnTypeChunk = D.getTypeObject(chunkIndex + 1); 2562 assert(ReturnTypeChunk.Kind == DeclaratorChunk::Pointer); 2563 2564 DeclaratorChunk::PointerTypeInfo &PTI = ReturnTypeChunk.Ptr; 2565 2566 DiagnoseIgnoredQualifiers(PTI.TypeQuals, 2567 SourceLocation::getFromRawEncoding(PTI.ConstQualLoc), 2568 SourceLocation::getFromRawEncoding(PTI.VolatileQualLoc), 2569 SourceLocation::getFromRawEncoding(PTI.RestrictQualLoc), 2570 S); 2571 2572 } else if (T.getCVRQualifiers() && D.getDeclSpec().getTypeQualifiers() && 2573 (!LangOpts.CPlusPlus || 2574 (!T->isDependentType() && !T->isRecordType()))) { 2575 2576 DiagnoseIgnoredQualifiers(D.getDeclSpec().getTypeQualifiers(), 2577 D.getDeclSpec().getConstSpecLoc(), 2578 D.getDeclSpec().getVolatileSpecLoc(), 2579 D.getDeclSpec().getRestrictSpecLoc(), 2580 S); 2581 } 2582 2583 // Objective-C ARC ownership qualifiers are ignored on the function 2584 // return type (by type canonicalization). Complain if this attribute 2585 // was written here. 2586 if (T.getQualifiers().hasObjCLifetime()) { 2587 SourceLocation AttrLoc; 2588 if (chunkIndex + 1 < D.getNumTypeObjects()) { 2589 DeclaratorChunk ReturnTypeChunk = D.getTypeObject(chunkIndex + 1); 2590 for (const AttributeList *Attr = ReturnTypeChunk.getAttrs(); 2591 Attr; Attr = Attr->getNext()) { 2592 if (Attr->getKind() == AttributeList::AT_ObjCOwnership) { 2593 AttrLoc = Attr->getLoc(); 2594 break; 2595 } 2596 } 2597 } 2598 if (AttrLoc.isInvalid()) { 2599 for (const AttributeList *Attr 2600 = D.getDeclSpec().getAttributes().getList(); 2601 Attr; Attr = Attr->getNext()) { 2602 if (Attr->getKind() == AttributeList::AT_ObjCOwnership) { 2603 AttrLoc = Attr->getLoc(); 2604 break; 2605 } 2606 } 2607 } 2608 2609 if (AttrLoc.isValid()) { 2610 // The ownership attributes are almost always written via 2611 // the predefined 2612 // __strong/__weak/__autoreleasing/__unsafe_unretained. 2613 if (AttrLoc.isMacroID()) 2614 AttrLoc = S.SourceMgr.getImmediateExpansionRange(AttrLoc).first; 2615 2616 S.Diag(AttrLoc, diag::warn_arc_lifetime_result_type) 2617 << T.getQualifiers().getObjCLifetime(); 2618 } 2619 } 2620 2621 if (LangOpts.CPlusPlus && D.getDeclSpec().isTypeSpecOwned()) { 2622 // C++ [dcl.fct]p6: 2623 // Types shall not be defined in return or parameter types. 2624 TagDecl *Tag = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 2625 if (Tag->isCompleteDefinition()) 2626 S.Diag(Tag->getLocation(), diag::err_type_defined_in_result_type) 2627 << Context.getTypeDeclType(Tag); 2628 } 2629 2630 // Exception specs are not allowed in typedefs. Complain, but add it 2631 // anyway. 2632 if (IsTypedefName && FTI.getExceptionSpecType()) 2633 S.Diag(FTI.getExceptionSpecLoc(), diag::err_exception_spec_in_typedef) 2634 << (D.getContext() == Declarator::AliasDeclContext || 2635 D.getContext() == Declarator::AliasTemplateContext); 2636 2637 // If we see "T var();" or "T var(T());" at block scope, it is probably 2638 // an attempt to initialize a variable, not a function declaration. 2639 if (FTI.isAmbiguous) 2640 warnAboutAmbiguousFunction(S, D, DeclType, T); 2641 2642 if (!FTI.NumArgs && !FTI.isVariadic && !LangOpts.CPlusPlus) { 2643 // Simple void foo(), where the incoming T is the result type. 2644 T = Context.getFunctionNoProtoType(T); 2645 } else { 2646 // We allow a zero-parameter variadic function in C if the 2647 // function is marked with the "overloadable" attribute. Scan 2648 // for this attribute now. 2649 if (!FTI.NumArgs && FTI.isVariadic && !LangOpts.CPlusPlus) { 2650 bool Overloadable = false; 2651 for (const AttributeList *Attrs = D.getAttributes(); 2652 Attrs; Attrs = Attrs->getNext()) { 2653 if (Attrs->getKind() == AttributeList::AT_Overloadable) { 2654 Overloadable = true; 2655 break; 2656 } 2657 } 2658 2659 if (!Overloadable) 2660 S.Diag(FTI.getEllipsisLoc(), diag::err_ellipsis_first_arg); 2661 } 2662 2663 if (FTI.NumArgs && FTI.ArgInfo[0].Param == 0) { 2664 // C99 6.7.5.3p3: Reject int(x,y,z) when it's not a function 2665 // definition. 2666 S.Diag(FTI.ArgInfo[0].IdentLoc, diag::err_ident_list_in_fn_declaration); 2667 D.setInvalidType(true); 2668 // Recover by creating a K&R-style function type. 2669 T = Context.getFunctionNoProtoType(T); 2670 break; 2671 } 2672 2673 FunctionProtoType::ExtProtoInfo EPI; 2674 EPI.Variadic = FTI.isVariadic; 2675 EPI.HasTrailingReturn = FTI.hasTrailingReturnType(); 2676 EPI.TypeQuals = FTI.TypeQuals; 2677 EPI.RefQualifier = !FTI.hasRefQualifier()? RQ_None 2678 : FTI.RefQualifierIsLValueRef? RQ_LValue 2679 : RQ_RValue; 2680 2681 // Otherwise, we have a function with an argument list that is 2682 // potentially variadic. 2683 SmallVector<QualType, 16> ArgTys; 2684 ArgTys.reserve(FTI.NumArgs); 2685 2686 SmallVector<bool, 16> ConsumedArguments; 2687 ConsumedArguments.reserve(FTI.NumArgs); 2688 bool HasAnyConsumedArguments = false; 2689 2690 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 2691 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 2692 QualType ArgTy = Param->getType(); 2693 assert(!ArgTy.isNull() && "Couldn't parse type?"); 2694 2695 // Adjust the parameter type. 2696 assert((ArgTy == Context.getAdjustedParameterType(ArgTy)) && 2697 "Unadjusted type?"); 2698 2699 // Look for 'void'. void is allowed only as a single argument to a 2700 // function with no other parameters (C99 6.7.5.3p10). We record 2701 // int(void) as a FunctionProtoType with an empty argument list. 2702 if (ArgTy->isVoidType()) { 2703 // If this is something like 'float(int, void)', reject it. 'void' 2704 // is an incomplete type (C99 6.2.5p19) and function decls cannot 2705 // have arguments of incomplete type. 2706 if (FTI.NumArgs != 1 || FTI.isVariadic) { 2707 S.Diag(DeclType.Loc, diag::err_void_only_param); 2708 ArgTy = Context.IntTy; 2709 Param->setType(ArgTy); 2710 } else if (FTI.ArgInfo[i].Ident) { 2711 // Reject, but continue to parse 'int(void abc)'. 2712 S.Diag(FTI.ArgInfo[i].IdentLoc, 2713 diag::err_param_with_void_type); 2714 ArgTy = Context.IntTy; 2715 Param->setType(ArgTy); 2716 } else { 2717 // Reject, but continue to parse 'float(const void)'. 2718 if (ArgTy.hasQualifiers()) 2719 S.Diag(DeclType.Loc, diag::err_void_param_qualified); 2720 2721 // Do not add 'void' to the ArgTys list. 2722 break; 2723 } 2724 } else if (ArgTy->isHalfType()) { 2725 // Disallow half FP arguments. 2726 // FIXME: This really should be in BuildFunctionType. 2727 if (S.getLangOpts().OpenCL) { 2728 if (!S.getOpenCLOptions().cl_khr_fp16) { 2729 S.Diag(Param->getLocation(), 2730 diag::err_opencl_half_argument) << ArgTy; 2731 D.setInvalidType(); 2732 Param->setInvalidDecl(); 2733 } 2734 } else { 2735 S.Diag(Param->getLocation(), 2736 diag::err_parameters_retval_cannot_have_fp16_type) << 0; 2737 D.setInvalidType(); 2738 } 2739 } else if (!FTI.hasPrototype) { 2740 if (ArgTy->isPromotableIntegerType()) { 2741 ArgTy = Context.getPromotedIntegerType(ArgTy); 2742 Param->setKNRPromoted(true); 2743 } else if (const BuiltinType* BTy = ArgTy->getAs<BuiltinType>()) { 2744 if (BTy->getKind() == BuiltinType::Float) { 2745 ArgTy = Context.DoubleTy; 2746 Param->setKNRPromoted(true); 2747 } 2748 } 2749 } 2750 2751 if (LangOpts.ObjCAutoRefCount) { 2752 bool Consumed = Param->hasAttr<NSConsumedAttr>(); 2753 ConsumedArguments.push_back(Consumed); 2754 HasAnyConsumedArguments |= Consumed; 2755 } 2756 2757 ArgTys.push_back(ArgTy); 2758 } 2759 2760 if (HasAnyConsumedArguments) 2761 EPI.ConsumedArguments = ConsumedArguments.data(); 2762 2763 SmallVector<QualType, 4> Exceptions; 2764 SmallVector<ParsedType, 2> DynamicExceptions; 2765 SmallVector<SourceRange, 2> DynamicExceptionRanges; 2766 Expr *NoexceptExpr = 0; 2767 2768 if (FTI.getExceptionSpecType() == EST_Dynamic) { 2769 // FIXME: It's rather inefficient to have to split into two vectors 2770 // here. 2771 unsigned N = FTI.NumExceptions; 2772 DynamicExceptions.reserve(N); 2773 DynamicExceptionRanges.reserve(N); 2774 for (unsigned I = 0; I != N; ++I) { 2775 DynamicExceptions.push_back(FTI.Exceptions[I].Ty); 2776 DynamicExceptionRanges.push_back(FTI.Exceptions[I].Range); 2777 } 2778 } else if (FTI.getExceptionSpecType() == EST_ComputedNoexcept) { 2779 NoexceptExpr = FTI.NoexceptExpr; 2780 } 2781 2782 S.checkExceptionSpecification(FTI.getExceptionSpecType(), 2783 DynamicExceptions, 2784 DynamicExceptionRanges, 2785 NoexceptExpr, 2786 Exceptions, 2787 EPI); 2788 2789 T = Context.getFunctionType(T, ArgTys.data(), ArgTys.size(), EPI); 2790 } 2791 2792 break; 2793 } 2794 case DeclaratorChunk::MemberPointer: 2795 // The scope spec must refer to a class, or be dependent. 2796 CXXScopeSpec &SS = DeclType.Mem.Scope(); 2797 QualType ClsType; 2798 if (SS.isInvalid()) { 2799 // Avoid emitting extra errors if we already errored on the scope. 2800 D.setInvalidType(true); 2801 } else if (S.isDependentScopeSpecifier(SS) || 2802 dyn_cast_or_null<CXXRecordDecl>(S.computeDeclContext(SS))) { 2803 NestedNameSpecifier *NNS 2804 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 2805 NestedNameSpecifier *NNSPrefix = NNS->getPrefix(); 2806 switch (NNS->getKind()) { 2807 case NestedNameSpecifier::Identifier: 2808 ClsType = Context.getDependentNameType(ETK_None, NNSPrefix, 2809 NNS->getAsIdentifier()); 2810 break; 2811 2812 case NestedNameSpecifier::Namespace: 2813 case NestedNameSpecifier::NamespaceAlias: 2814 case NestedNameSpecifier::Global: 2815 llvm_unreachable("Nested-name-specifier must name a type"); 2816 2817 case NestedNameSpecifier::TypeSpec: 2818 case NestedNameSpecifier::TypeSpecWithTemplate: 2819 ClsType = QualType(NNS->getAsType(), 0); 2820 // Note: if the NNS has a prefix and ClsType is a nondependent 2821 // TemplateSpecializationType, then the NNS prefix is NOT included 2822 // in ClsType; hence we wrap ClsType into an ElaboratedType. 2823 // NOTE: in particular, no wrap occurs if ClsType already is an 2824 // Elaborated, DependentName, or DependentTemplateSpecialization. 2825 if (NNSPrefix && isa<TemplateSpecializationType>(NNS->getAsType())) 2826 ClsType = Context.getElaboratedType(ETK_None, NNSPrefix, ClsType); 2827 break; 2828 } 2829 } else { 2830 S.Diag(DeclType.Mem.Scope().getBeginLoc(), 2831 diag::err_illegal_decl_mempointer_in_nonclass) 2832 << (D.getIdentifier() ? D.getIdentifier()->getName() : "type name") 2833 << DeclType.Mem.Scope().getRange(); 2834 D.setInvalidType(true); 2835 } 2836 2837 if (!ClsType.isNull()) 2838 T = S.BuildMemberPointerType(T, ClsType, DeclType.Loc, D.getIdentifier()); 2839 if (T.isNull()) { 2840 T = Context.IntTy; 2841 D.setInvalidType(true); 2842 } else if (DeclType.Mem.TypeQuals) { 2843 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Mem.TypeQuals); 2844 } 2845 break; 2846 } 2847 2848 if (T.isNull()) { 2849 D.setInvalidType(true); 2850 T = Context.IntTy; 2851 } 2852 2853 // See if there are any attributes on this declarator chunk. 2854 if (AttributeList *attrs = const_cast<AttributeList*>(DeclType.getAttrs())) 2855 processTypeAttrs(state, T, TAL_DeclChunk, attrs); 2856 } 2857 2858 if (LangOpts.CPlusPlus && T->isFunctionType()) { 2859 const FunctionProtoType *FnTy = T->getAs<FunctionProtoType>(); 2860 assert(FnTy && "Why oh why is there not a FunctionProtoType here?"); 2861 2862 // C++ 8.3.5p4: 2863 // A cv-qualifier-seq shall only be part of the function type 2864 // for a nonstatic member function, the function type to which a pointer 2865 // to member refers, or the top-level function type of a function typedef 2866 // declaration. 2867 // 2868 // Core issue 547 also allows cv-qualifiers on function types that are 2869 // top-level template type arguments. 2870 bool FreeFunction; 2871 if (!D.getCXXScopeSpec().isSet()) { 2872 FreeFunction = ((D.getContext() != Declarator::MemberContext && 2873 D.getContext() != Declarator::LambdaExprContext) || 2874 D.getDeclSpec().isFriendSpecified()); 2875 } else { 2876 DeclContext *DC = S.computeDeclContext(D.getCXXScopeSpec()); 2877 FreeFunction = (DC && !DC->isRecord()); 2878 } 2879 2880 // C++11 [dcl.fct]p6 (w/DR1417): 2881 // An attempt to specify a function type with a cv-qualifier-seq or a 2882 // ref-qualifier (including by typedef-name) is ill-formed unless it is: 2883 // - the function type for a non-static member function, 2884 // - the function type to which a pointer to member refers, 2885 // - the top-level function type of a function typedef declaration or 2886 // alias-declaration, 2887 // - the type-id in the default argument of a type-parameter, or 2888 // - the type-id of a template-argument for a type-parameter 2889 if (IsQualifiedFunction && 2890 !(!FreeFunction && 2891 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) && 2892 !IsTypedefName && 2893 D.getContext() != Declarator::TemplateTypeArgContext) { 2894 SourceLocation Loc = D.getLocStart(); 2895 SourceRange RemovalRange; 2896 unsigned I; 2897 if (D.isFunctionDeclarator(I)) { 2898 SmallVector<SourceLocation, 4> RemovalLocs; 2899 const DeclaratorChunk &Chunk = D.getTypeObject(I); 2900 assert(Chunk.Kind == DeclaratorChunk::Function); 2901 if (Chunk.Fun.hasRefQualifier()) 2902 RemovalLocs.push_back(Chunk.Fun.getRefQualifierLoc()); 2903 if (Chunk.Fun.TypeQuals & Qualifiers::Const) 2904 RemovalLocs.push_back(Chunk.Fun.getConstQualifierLoc()); 2905 if (Chunk.Fun.TypeQuals & Qualifiers::Volatile) 2906 RemovalLocs.push_back(Chunk.Fun.getVolatileQualifierLoc()); 2907 // FIXME: We do not track the location of the __restrict qualifier. 2908 //if (Chunk.Fun.TypeQuals & Qualifiers::Restrict) 2909 // RemovalLocs.push_back(Chunk.Fun.getRestrictQualifierLoc()); 2910 if (!RemovalLocs.empty()) { 2911 std::sort(RemovalLocs.begin(), RemovalLocs.end(), 2912 BeforeThanCompare<SourceLocation>(S.getSourceManager())); 2913 RemovalRange = SourceRange(RemovalLocs.front(), RemovalLocs.back()); 2914 Loc = RemovalLocs.front(); 2915 } 2916 } 2917 2918 S.Diag(Loc, diag::err_invalid_qualified_function_type) 2919 << FreeFunction << D.isFunctionDeclarator() << T 2920 << getFunctionQualifiersAsString(FnTy) 2921 << FixItHint::CreateRemoval(RemovalRange); 2922 2923 // Strip the cv-qualifiers and ref-qualifiers from the type. 2924 FunctionProtoType::ExtProtoInfo EPI = FnTy->getExtProtoInfo(); 2925 EPI.TypeQuals = 0; 2926 EPI.RefQualifier = RQ_None; 2927 2928 T = Context.getFunctionType(FnTy->getResultType(), 2929 FnTy->arg_type_begin(), 2930 FnTy->getNumArgs(), EPI); 2931 // Rebuild any parens around the identifier in the function type. 2932 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 2933 if (D.getTypeObject(i).Kind != DeclaratorChunk::Paren) 2934 break; 2935 T = S.BuildParenType(T); 2936 } 2937 } 2938 } 2939 2940 // Apply any undistributed attributes from the declarator. 2941 if (!T.isNull()) 2942 if (AttributeList *attrs = D.getAttributes()) 2943 processTypeAttrs(state, T, TAL_DeclName, attrs); 2944 2945 // Diagnose any ignored type attributes. 2946 if (!T.isNull()) state.diagnoseIgnoredTypeAttrs(T); 2947 2948 // C++0x [dcl.constexpr]p9: 2949 // A constexpr specifier used in an object declaration declares the object 2950 // as const. 2951 if (D.getDeclSpec().isConstexprSpecified() && T->isObjectType()) { 2952 T.addConst(); 2953 } 2954 2955 // If there was an ellipsis in the declarator, the declaration declares a 2956 // parameter pack whose type may be a pack expansion type. 2957 if (D.hasEllipsis() && !T.isNull()) { 2958 // C++0x [dcl.fct]p13: 2959 // A declarator-id or abstract-declarator containing an ellipsis shall 2960 // only be used in a parameter-declaration. Such a parameter-declaration 2961 // is a parameter pack (14.5.3). [...] 2962 switch (D.getContext()) { 2963 case Declarator::PrototypeContext: 2964 // C++0x [dcl.fct]p13: 2965 // [...] When it is part of a parameter-declaration-clause, the 2966 // parameter pack is a function parameter pack (14.5.3). The type T 2967 // of the declarator-id of the function parameter pack shall contain 2968 // a template parameter pack; each template parameter pack in T is 2969 // expanded by the function parameter pack. 2970 // 2971 // We represent function parameter packs as function parameters whose 2972 // type is a pack expansion. 2973 if (!T->containsUnexpandedParameterPack()) { 2974 S.Diag(D.getEllipsisLoc(), 2975 diag::err_function_parameter_pack_without_parameter_packs) 2976 << T << D.getSourceRange(); 2977 D.setEllipsisLoc(SourceLocation()); 2978 } else { 2979 T = Context.getPackExpansionType(T, None); 2980 } 2981 break; 2982 2983 case Declarator::TemplateParamContext: 2984 // C++0x [temp.param]p15: 2985 // If a template-parameter is a [...] is a parameter-declaration that 2986 // declares a parameter pack (8.3.5), then the template-parameter is a 2987 // template parameter pack (14.5.3). 2988 // 2989 // Note: core issue 778 clarifies that, if there are any unexpanded 2990 // parameter packs in the type of the non-type template parameter, then 2991 // it expands those parameter packs. 2992 if (T->containsUnexpandedParameterPack()) 2993 T = Context.getPackExpansionType(T, None); 2994 else 2995 S.Diag(D.getEllipsisLoc(), 2996 LangOpts.CPlusPlus11 2997 ? diag::warn_cxx98_compat_variadic_templates 2998 : diag::ext_variadic_templates); 2999 break; 3000 3001 case Declarator::FileContext: 3002 case Declarator::KNRTypeListContext: 3003 case Declarator::ObjCParameterContext: // FIXME: special diagnostic here? 3004 case Declarator::ObjCResultContext: // FIXME: special diagnostic here? 3005 case Declarator::TypeNameContext: 3006 case Declarator::CXXNewContext: 3007 case Declarator::AliasDeclContext: 3008 case Declarator::AliasTemplateContext: 3009 case Declarator::MemberContext: 3010 case Declarator::BlockContext: 3011 case Declarator::ForContext: 3012 case Declarator::ConditionContext: 3013 case Declarator::CXXCatchContext: 3014 case Declarator::ObjCCatchContext: 3015 case Declarator::BlockLiteralContext: 3016 case Declarator::LambdaExprContext: 3017 case Declarator::TrailingReturnContext: 3018 case Declarator::TemplateTypeArgContext: 3019 // FIXME: We may want to allow parameter packs in block-literal contexts 3020 // in the future. 3021 S.Diag(D.getEllipsisLoc(), diag::err_ellipsis_in_declarator_not_parameter); 3022 D.setEllipsisLoc(SourceLocation()); 3023 break; 3024 } 3025 } 3026 3027 if (T.isNull()) 3028 return Context.getNullTypeSourceInfo(); 3029 else if (D.isInvalidType()) 3030 return Context.getTrivialTypeSourceInfo(T); 3031 3032 return S.GetTypeSourceInfoForDeclarator(D, T, TInfo); 3033} 3034 3035/// GetTypeForDeclarator - Convert the type for the specified 3036/// declarator to Type instances. 3037/// 3038/// The result of this call will never be null, but the associated 3039/// type may be a null type if there's an unrecoverable error. 3040TypeSourceInfo *Sema::GetTypeForDeclarator(Declarator &D, Scope *S) { 3041 // Determine the type of the declarator. Not all forms of declarator 3042 // have a type. 3043 3044 TypeProcessingState state(*this, D); 3045 3046 TypeSourceInfo *ReturnTypeInfo = 0; 3047 QualType T = GetDeclSpecTypeForDeclarator(state, ReturnTypeInfo); 3048 if (T.isNull()) 3049 return Context.getNullTypeSourceInfo(); 3050 3051 if (D.isPrototypeContext() && getLangOpts().ObjCAutoRefCount) 3052 inferARCWriteback(state, T); 3053 3054 return GetFullTypeForDeclarator(state, T, ReturnTypeInfo); 3055} 3056 3057static void transferARCOwnershipToDeclSpec(Sema &S, 3058 QualType &declSpecTy, 3059 Qualifiers::ObjCLifetime ownership) { 3060 if (declSpecTy->isObjCRetainableType() && 3061 declSpecTy.getObjCLifetime() == Qualifiers::OCL_None) { 3062 Qualifiers qs; 3063 qs.addObjCLifetime(ownership); 3064 declSpecTy = S.Context.getQualifiedType(declSpecTy, qs); 3065 } 3066} 3067 3068static void transferARCOwnershipToDeclaratorChunk(TypeProcessingState &state, 3069 Qualifiers::ObjCLifetime ownership, 3070 unsigned chunkIndex) { 3071 Sema &S = state.getSema(); 3072 Declarator &D = state.getDeclarator(); 3073 3074 // Look for an explicit lifetime attribute. 3075 DeclaratorChunk &chunk = D.getTypeObject(chunkIndex); 3076 for (const AttributeList *attr = chunk.getAttrs(); attr; 3077 attr = attr->getNext()) 3078 if (attr->getKind() == AttributeList::AT_ObjCOwnership) 3079 return; 3080 3081 const char *attrStr = 0; 3082 switch (ownership) { 3083 case Qualifiers::OCL_None: llvm_unreachable("no ownership!"); 3084 case Qualifiers::OCL_ExplicitNone: attrStr = "none"; break; 3085 case Qualifiers::OCL_Strong: attrStr = "strong"; break; 3086 case Qualifiers::OCL_Weak: attrStr = "weak"; break; 3087 case Qualifiers::OCL_Autoreleasing: attrStr = "autoreleasing"; break; 3088 } 3089 3090 // If there wasn't one, add one (with an invalid source location 3091 // so that we don't make an AttributedType for it). 3092 AttributeList *attr = D.getAttributePool() 3093 .create(&S.Context.Idents.get("objc_ownership"), SourceLocation(), 3094 /*scope*/ 0, SourceLocation(), 3095 &S.Context.Idents.get(attrStr), SourceLocation(), 3096 /*args*/ 0, 0, AttributeList::AS_GNU); 3097 spliceAttrIntoList(*attr, chunk.getAttrListRef()); 3098 3099 // TODO: mark whether we did this inference? 3100} 3101 3102/// \brief Used for transferring ownership in casts resulting in l-values. 3103static void transferARCOwnership(TypeProcessingState &state, 3104 QualType &declSpecTy, 3105 Qualifiers::ObjCLifetime ownership) { 3106 Sema &S = state.getSema(); 3107 Declarator &D = state.getDeclarator(); 3108 3109 int inner = -1; 3110 bool hasIndirection = false; 3111 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 3112 DeclaratorChunk &chunk = D.getTypeObject(i); 3113 switch (chunk.Kind) { 3114 case DeclaratorChunk::Paren: 3115 // Ignore parens. 3116 break; 3117 3118 case DeclaratorChunk::Array: 3119 case DeclaratorChunk::Reference: 3120 case DeclaratorChunk::Pointer: 3121 if (inner != -1) 3122 hasIndirection = true; 3123 inner = i; 3124 break; 3125 3126 case DeclaratorChunk::BlockPointer: 3127 if (inner != -1) 3128 transferARCOwnershipToDeclaratorChunk(state, ownership, i); 3129 return; 3130 3131 case DeclaratorChunk::Function: 3132 case DeclaratorChunk::MemberPointer: 3133 return; 3134 } 3135 } 3136 3137 if (inner == -1) 3138 return; 3139 3140 DeclaratorChunk &chunk = D.getTypeObject(inner); 3141 if (chunk.Kind == DeclaratorChunk::Pointer) { 3142 if (declSpecTy->isObjCRetainableType()) 3143 return transferARCOwnershipToDeclSpec(S, declSpecTy, ownership); 3144 if (declSpecTy->isObjCObjectType() && hasIndirection) 3145 return transferARCOwnershipToDeclaratorChunk(state, ownership, inner); 3146 } else { 3147 assert(chunk.Kind == DeclaratorChunk::Array || 3148 chunk.Kind == DeclaratorChunk::Reference); 3149 return transferARCOwnershipToDeclSpec(S, declSpecTy, ownership); 3150 } 3151} 3152 3153TypeSourceInfo *Sema::GetTypeForDeclaratorCast(Declarator &D, QualType FromTy) { 3154 TypeProcessingState state(*this, D); 3155 3156 TypeSourceInfo *ReturnTypeInfo = 0; 3157 QualType declSpecTy = GetDeclSpecTypeForDeclarator(state, ReturnTypeInfo); 3158 if (declSpecTy.isNull()) 3159 return Context.getNullTypeSourceInfo(); 3160 3161 if (getLangOpts().ObjCAutoRefCount) { 3162 Qualifiers::ObjCLifetime ownership = Context.getInnerObjCOwnership(FromTy); 3163 if (ownership != Qualifiers::OCL_None) 3164 transferARCOwnership(state, declSpecTy, ownership); 3165 } 3166 3167 return GetFullTypeForDeclarator(state, declSpecTy, ReturnTypeInfo); 3168} 3169 3170/// Map an AttributedType::Kind to an AttributeList::Kind. 3171static AttributeList::Kind getAttrListKind(AttributedType::Kind kind) { 3172 switch (kind) { 3173 case AttributedType::attr_address_space: 3174 return AttributeList::AT_AddressSpace; 3175 case AttributedType::attr_regparm: 3176 return AttributeList::AT_Regparm; 3177 case AttributedType::attr_vector_size: 3178 return AttributeList::AT_VectorSize; 3179 case AttributedType::attr_neon_vector_type: 3180 return AttributeList::AT_NeonVectorType; 3181 case AttributedType::attr_neon_polyvector_type: 3182 return AttributeList::AT_NeonPolyVectorType; 3183 case AttributedType::attr_objc_gc: 3184 return AttributeList::AT_ObjCGC; 3185 case AttributedType::attr_objc_ownership: 3186 return AttributeList::AT_ObjCOwnership; 3187 case AttributedType::attr_noreturn: 3188 return AttributeList::AT_NoReturn; 3189 case AttributedType::attr_cdecl: 3190 return AttributeList::AT_CDecl; 3191 case AttributedType::attr_fastcall: 3192 return AttributeList::AT_FastCall; 3193 case AttributedType::attr_stdcall: 3194 return AttributeList::AT_StdCall; 3195 case AttributedType::attr_thiscall: 3196 return AttributeList::AT_ThisCall; 3197 case AttributedType::attr_pascal: 3198 return AttributeList::AT_Pascal; 3199 case AttributedType::attr_pcs: 3200 return AttributeList::AT_Pcs; 3201 case AttributedType::attr_pnaclcall: 3202 return AttributeList::AT_PnaclCall; 3203 case AttributedType::attr_inteloclbicc: 3204 return AttributeList::AT_IntelOclBicc; 3205 } 3206 llvm_unreachable("unexpected attribute kind!"); 3207} 3208 3209static void fillAttributedTypeLoc(AttributedTypeLoc TL, 3210 const AttributeList *attrs) { 3211 AttributedType::Kind kind = TL.getAttrKind(); 3212 3213 assert(attrs && "no type attributes in the expected location!"); 3214 AttributeList::Kind parsedKind = getAttrListKind(kind); 3215 while (attrs->getKind() != parsedKind) { 3216 attrs = attrs->getNext(); 3217 assert(attrs && "no matching attribute in expected location!"); 3218 } 3219 3220 TL.setAttrNameLoc(attrs->getLoc()); 3221 if (TL.hasAttrExprOperand()) 3222 TL.setAttrExprOperand(attrs->getArg(0)); 3223 else if (TL.hasAttrEnumOperand()) 3224 TL.setAttrEnumOperandLoc(attrs->getParameterLoc()); 3225 3226 // FIXME: preserve this information to here. 3227 if (TL.hasAttrOperand()) 3228 TL.setAttrOperandParensRange(SourceRange()); 3229} 3230 3231namespace { 3232 class TypeSpecLocFiller : public TypeLocVisitor<TypeSpecLocFiller> { 3233 ASTContext &Context; 3234 const DeclSpec &DS; 3235 3236 public: 3237 TypeSpecLocFiller(ASTContext &Context, const DeclSpec &DS) 3238 : Context(Context), DS(DS) {} 3239 3240 void VisitAttributedTypeLoc(AttributedTypeLoc TL) { 3241 fillAttributedTypeLoc(TL, DS.getAttributes().getList()); 3242 Visit(TL.getModifiedLoc()); 3243 } 3244 void VisitQualifiedTypeLoc(QualifiedTypeLoc TL) { 3245 Visit(TL.getUnqualifiedLoc()); 3246 } 3247 void VisitTypedefTypeLoc(TypedefTypeLoc TL) { 3248 TL.setNameLoc(DS.getTypeSpecTypeLoc()); 3249 } 3250 void VisitObjCInterfaceTypeLoc(ObjCInterfaceTypeLoc TL) { 3251 TL.setNameLoc(DS.getTypeSpecTypeLoc()); 3252 // FIXME. We should have DS.getTypeSpecTypeEndLoc(). But, it requires 3253 // addition field. What we have is good enough for dispay of location 3254 // of 'fixit' on interface name. 3255 TL.setNameEndLoc(DS.getLocEnd()); 3256 } 3257 void VisitObjCObjectTypeLoc(ObjCObjectTypeLoc TL) { 3258 // Handle the base type, which might not have been written explicitly. 3259 if (DS.getTypeSpecType() == DeclSpec::TST_unspecified) { 3260 TL.setHasBaseTypeAsWritten(false); 3261 TL.getBaseLoc().initialize(Context, SourceLocation()); 3262 } else { 3263 TL.setHasBaseTypeAsWritten(true); 3264 Visit(TL.getBaseLoc()); 3265 } 3266 3267 // Protocol qualifiers. 3268 if (DS.getProtocolQualifiers()) { 3269 assert(TL.getNumProtocols() > 0); 3270 assert(TL.getNumProtocols() == DS.getNumProtocolQualifiers()); 3271 TL.setLAngleLoc(DS.getProtocolLAngleLoc()); 3272 TL.setRAngleLoc(DS.getSourceRange().getEnd()); 3273 for (unsigned i = 0, e = DS.getNumProtocolQualifiers(); i != e; ++i) 3274 TL.setProtocolLoc(i, DS.getProtocolLocs()[i]); 3275 } else { 3276 assert(TL.getNumProtocols() == 0); 3277 TL.setLAngleLoc(SourceLocation()); 3278 TL.setRAngleLoc(SourceLocation()); 3279 } 3280 } 3281 void VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL) { 3282 TL.setStarLoc(SourceLocation()); 3283 Visit(TL.getPointeeLoc()); 3284 } 3285 void VisitTemplateSpecializationTypeLoc(TemplateSpecializationTypeLoc TL) { 3286 TypeSourceInfo *TInfo = 0; 3287 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 3288 3289 // If we got no declarator info from previous Sema routines, 3290 // just fill with the typespec loc. 3291 if (!TInfo) { 3292 TL.initialize(Context, DS.getTypeSpecTypeNameLoc()); 3293 return; 3294 } 3295 3296 TypeLoc OldTL = TInfo->getTypeLoc(); 3297 if (TInfo->getType()->getAs<ElaboratedType>()) { 3298 ElaboratedTypeLoc ElabTL = OldTL.castAs<ElaboratedTypeLoc>(); 3299 TemplateSpecializationTypeLoc NamedTL = ElabTL.getNamedTypeLoc() 3300 .castAs<TemplateSpecializationTypeLoc>(); 3301 TL.copy(NamedTL); 3302 } 3303 else 3304 TL.copy(OldTL.castAs<TemplateSpecializationTypeLoc>()); 3305 } 3306 void VisitTypeOfExprTypeLoc(TypeOfExprTypeLoc TL) { 3307 assert(DS.getTypeSpecType() == DeclSpec::TST_typeofExpr); 3308 TL.setTypeofLoc(DS.getTypeSpecTypeLoc()); 3309 TL.setParensRange(DS.getTypeofParensRange()); 3310 } 3311 void VisitTypeOfTypeLoc(TypeOfTypeLoc TL) { 3312 assert(DS.getTypeSpecType() == DeclSpec::TST_typeofType); 3313 TL.setTypeofLoc(DS.getTypeSpecTypeLoc()); 3314 TL.setParensRange(DS.getTypeofParensRange()); 3315 assert(DS.getRepAsType()); 3316 TypeSourceInfo *TInfo = 0; 3317 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 3318 TL.setUnderlyingTInfo(TInfo); 3319 } 3320 void VisitUnaryTransformTypeLoc(UnaryTransformTypeLoc TL) { 3321 // FIXME: This holds only because we only have one unary transform. 3322 assert(DS.getTypeSpecType() == DeclSpec::TST_underlyingType); 3323 TL.setKWLoc(DS.getTypeSpecTypeLoc()); 3324 TL.setParensRange(DS.getTypeofParensRange()); 3325 assert(DS.getRepAsType()); 3326 TypeSourceInfo *TInfo = 0; 3327 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 3328 TL.setUnderlyingTInfo(TInfo); 3329 } 3330 void VisitBuiltinTypeLoc(BuiltinTypeLoc TL) { 3331 // By default, use the source location of the type specifier. 3332 TL.setBuiltinLoc(DS.getTypeSpecTypeLoc()); 3333 if (TL.needsExtraLocalData()) { 3334 // Set info for the written builtin specifiers. 3335 TL.getWrittenBuiltinSpecs() = DS.getWrittenBuiltinSpecs(); 3336 // Try to have a meaningful source location. 3337 if (TL.getWrittenSignSpec() != TSS_unspecified) 3338 // Sign spec loc overrides the others (e.g., 'unsigned long'). 3339 TL.setBuiltinLoc(DS.getTypeSpecSignLoc()); 3340 else if (TL.getWrittenWidthSpec() != TSW_unspecified) 3341 // Width spec loc overrides type spec loc (e.g., 'short int'). 3342 TL.setBuiltinLoc(DS.getTypeSpecWidthLoc()); 3343 } 3344 } 3345 void VisitElaboratedTypeLoc(ElaboratedTypeLoc TL) { 3346 ElaboratedTypeKeyword Keyword 3347 = TypeWithKeyword::getKeywordForTypeSpec(DS.getTypeSpecType()); 3348 if (DS.getTypeSpecType() == TST_typename) { 3349 TypeSourceInfo *TInfo = 0; 3350 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 3351 if (TInfo) { 3352 TL.copy(TInfo->getTypeLoc().castAs<ElaboratedTypeLoc>()); 3353 return; 3354 } 3355 } 3356 TL.setElaboratedKeywordLoc(Keyword != ETK_None 3357 ? DS.getTypeSpecTypeLoc() 3358 : SourceLocation()); 3359 const CXXScopeSpec& SS = DS.getTypeSpecScope(); 3360 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 3361 Visit(TL.getNextTypeLoc().getUnqualifiedLoc()); 3362 } 3363 void VisitDependentNameTypeLoc(DependentNameTypeLoc TL) { 3364 assert(DS.getTypeSpecType() == TST_typename); 3365 TypeSourceInfo *TInfo = 0; 3366 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 3367 assert(TInfo); 3368 TL.copy(TInfo->getTypeLoc().castAs<DependentNameTypeLoc>()); 3369 } 3370 void VisitDependentTemplateSpecializationTypeLoc( 3371 DependentTemplateSpecializationTypeLoc TL) { 3372 assert(DS.getTypeSpecType() == TST_typename); 3373 TypeSourceInfo *TInfo = 0; 3374 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 3375 assert(TInfo); 3376 TL.copy( 3377 TInfo->getTypeLoc().castAs<DependentTemplateSpecializationTypeLoc>()); 3378 } 3379 void VisitTagTypeLoc(TagTypeLoc TL) { 3380 TL.setNameLoc(DS.getTypeSpecTypeNameLoc()); 3381 } 3382 void VisitAtomicTypeLoc(AtomicTypeLoc TL) { 3383 TL.setKWLoc(DS.getTypeSpecTypeLoc()); 3384 TL.setParensRange(DS.getTypeofParensRange()); 3385 3386 TypeSourceInfo *TInfo = 0; 3387 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 3388 TL.getValueLoc().initializeFullCopy(TInfo->getTypeLoc()); 3389 } 3390 3391 void VisitTypeLoc(TypeLoc TL) { 3392 // FIXME: add other typespec types and change this to an assert. 3393 TL.initialize(Context, DS.getTypeSpecTypeLoc()); 3394 } 3395 }; 3396 3397 class DeclaratorLocFiller : public TypeLocVisitor<DeclaratorLocFiller> { 3398 ASTContext &Context; 3399 const DeclaratorChunk &Chunk; 3400 3401 public: 3402 DeclaratorLocFiller(ASTContext &Context, const DeclaratorChunk &Chunk) 3403 : Context(Context), Chunk(Chunk) {} 3404 3405 void VisitQualifiedTypeLoc(QualifiedTypeLoc TL) { 3406 llvm_unreachable("qualified type locs not expected here!"); 3407 } 3408 3409 void VisitAttributedTypeLoc(AttributedTypeLoc TL) { 3410 fillAttributedTypeLoc(TL, Chunk.getAttrs()); 3411 } 3412 void VisitBlockPointerTypeLoc(BlockPointerTypeLoc TL) { 3413 assert(Chunk.Kind == DeclaratorChunk::BlockPointer); 3414 TL.setCaretLoc(Chunk.Loc); 3415 } 3416 void VisitPointerTypeLoc(PointerTypeLoc TL) { 3417 assert(Chunk.Kind == DeclaratorChunk::Pointer); 3418 TL.setStarLoc(Chunk.Loc); 3419 } 3420 void VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL) { 3421 assert(Chunk.Kind == DeclaratorChunk::Pointer); 3422 TL.setStarLoc(Chunk.Loc); 3423 } 3424 void VisitMemberPointerTypeLoc(MemberPointerTypeLoc TL) { 3425 assert(Chunk.Kind == DeclaratorChunk::MemberPointer); 3426 const CXXScopeSpec& SS = Chunk.Mem.Scope(); 3427 NestedNameSpecifierLoc NNSLoc = SS.getWithLocInContext(Context); 3428 3429 const Type* ClsTy = TL.getClass(); 3430 QualType ClsQT = QualType(ClsTy, 0); 3431 TypeSourceInfo *ClsTInfo = Context.CreateTypeSourceInfo(ClsQT, 0); 3432 // Now copy source location info into the type loc component. 3433 TypeLoc ClsTL = ClsTInfo->getTypeLoc(); 3434 switch (NNSLoc.getNestedNameSpecifier()->getKind()) { 3435 case NestedNameSpecifier::Identifier: 3436 assert(isa<DependentNameType>(ClsTy) && "Unexpected TypeLoc"); 3437 { 3438 DependentNameTypeLoc DNTLoc = ClsTL.castAs<DependentNameTypeLoc>(); 3439 DNTLoc.setElaboratedKeywordLoc(SourceLocation()); 3440 DNTLoc.setQualifierLoc(NNSLoc.getPrefix()); 3441 DNTLoc.setNameLoc(NNSLoc.getLocalBeginLoc()); 3442 } 3443 break; 3444 3445 case NestedNameSpecifier::TypeSpec: 3446 case NestedNameSpecifier::TypeSpecWithTemplate: 3447 if (isa<ElaboratedType>(ClsTy)) { 3448 ElaboratedTypeLoc ETLoc = ClsTL.castAs<ElaboratedTypeLoc>(); 3449 ETLoc.setElaboratedKeywordLoc(SourceLocation()); 3450 ETLoc.setQualifierLoc(NNSLoc.getPrefix()); 3451 TypeLoc NamedTL = ETLoc.getNamedTypeLoc(); 3452 NamedTL.initializeFullCopy(NNSLoc.getTypeLoc()); 3453 } else { 3454 ClsTL.initializeFullCopy(NNSLoc.getTypeLoc()); 3455 } 3456 break; 3457 3458 case NestedNameSpecifier::Namespace: 3459 case NestedNameSpecifier::NamespaceAlias: 3460 case NestedNameSpecifier::Global: 3461 llvm_unreachable("Nested-name-specifier must name a type"); 3462 } 3463 3464 // Finally fill in MemberPointerLocInfo fields. 3465 TL.setStarLoc(Chunk.Loc); 3466 TL.setClassTInfo(ClsTInfo); 3467 } 3468 void VisitLValueReferenceTypeLoc(LValueReferenceTypeLoc TL) { 3469 assert(Chunk.Kind == DeclaratorChunk::Reference); 3470 // 'Amp' is misleading: this might have been originally 3471 /// spelled with AmpAmp. 3472 TL.setAmpLoc(Chunk.Loc); 3473 } 3474 void VisitRValueReferenceTypeLoc(RValueReferenceTypeLoc TL) { 3475 assert(Chunk.Kind == DeclaratorChunk::Reference); 3476 assert(!Chunk.Ref.LValueRef); 3477 TL.setAmpAmpLoc(Chunk.Loc); 3478 } 3479 void VisitArrayTypeLoc(ArrayTypeLoc TL) { 3480 assert(Chunk.Kind == DeclaratorChunk::Array); 3481 TL.setLBracketLoc(Chunk.Loc); 3482 TL.setRBracketLoc(Chunk.EndLoc); 3483 TL.setSizeExpr(static_cast<Expr*>(Chunk.Arr.NumElts)); 3484 } 3485 void VisitFunctionTypeLoc(FunctionTypeLoc TL) { 3486 assert(Chunk.Kind == DeclaratorChunk::Function); 3487 TL.setLocalRangeBegin(Chunk.Loc); 3488 TL.setLocalRangeEnd(Chunk.EndLoc); 3489 3490 const DeclaratorChunk::FunctionTypeInfo &FTI = Chunk.Fun; 3491 TL.setLParenLoc(FTI.getLParenLoc()); 3492 TL.setRParenLoc(FTI.getRParenLoc()); 3493 for (unsigned i = 0, e = TL.getNumArgs(), tpi = 0; i != e; ++i) { 3494 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 3495 TL.setArg(tpi++, Param); 3496 } 3497 // FIXME: exception specs 3498 } 3499 void VisitParenTypeLoc(ParenTypeLoc TL) { 3500 assert(Chunk.Kind == DeclaratorChunk::Paren); 3501 TL.setLParenLoc(Chunk.Loc); 3502 TL.setRParenLoc(Chunk.EndLoc); 3503 } 3504 3505 void VisitTypeLoc(TypeLoc TL) { 3506 llvm_unreachable("unsupported TypeLoc kind in declarator!"); 3507 } 3508 }; 3509} 3510 3511/// \brief Create and instantiate a TypeSourceInfo with type source information. 3512/// 3513/// \param T QualType referring to the type as written in source code. 3514/// 3515/// \param ReturnTypeInfo For declarators whose return type does not show 3516/// up in the normal place in the declaration specifiers (such as a C++ 3517/// conversion function), this pointer will refer to a type source information 3518/// for that return type. 3519TypeSourceInfo * 3520Sema::GetTypeSourceInfoForDeclarator(Declarator &D, QualType T, 3521 TypeSourceInfo *ReturnTypeInfo) { 3522 TypeSourceInfo *TInfo = Context.CreateTypeSourceInfo(T); 3523 UnqualTypeLoc CurrTL = TInfo->getTypeLoc().getUnqualifiedLoc(); 3524 3525 // Handle parameter packs whose type is a pack expansion. 3526 if (isa<PackExpansionType>(T)) { 3527 CurrTL.castAs<PackExpansionTypeLoc>().setEllipsisLoc(D.getEllipsisLoc()); 3528 CurrTL = CurrTL.getNextTypeLoc().getUnqualifiedLoc(); 3529 } 3530 3531 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 3532 while (AttributedTypeLoc TL = CurrTL.getAs<AttributedTypeLoc>()) { 3533 fillAttributedTypeLoc(TL, D.getTypeObject(i).getAttrs()); 3534 CurrTL = TL.getNextTypeLoc().getUnqualifiedLoc(); 3535 } 3536 3537 DeclaratorLocFiller(Context, D.getTypeObject(i)).Visit(CurrTL); 3538 CurrTL = CurrTL.getNextTypeLoc().getUnqualifiedLoc(); 3539 } 3540 3541 // If we have different source information for the return type, use 3542 // that. This really only applies to C++ conversion functions. 3543 if (ReturnTypeInfo) { 3544 TypeLoc TL = ReturnTypeInfo->getTypeLoc(); 3545 assert(TL.getFullDataSize() == CurrTL.getFullDataSize()); 3546 memcpy(CurrTL.getOpaqueData(), TL.getOpaqueData(), TL.getFullDataSize()); 3547 } else { 3548 TypeSpecLocFiller(Context, D.getDeclSpec()).Visit(CurrTL); 3549 } 3550 3551 return TInfo; 3552} 3553 3554/// \brief Create a LocInfoType to hold the given QualType and TypeSourceInfo. 3555ParsedType Sema::CreateParsedType(QualType T, TypeSourceInfo *TInfo) { 3556 // FIXME: LocInfoTypes are "transient", only needed for passing to/from Parser 3557 // and Sema during declaration parsing. Try deallocating/caching them when 3558 // it's appropriate, instead of allocating them and keeping them around. 3559 LocInfoType *LocT = (LocInfoType*)BumpAlloc.Allocate(sizeof(LocInfoType), 3560 TypeAlignment); 3561 new (LocT) LocInfoType(T, TInfo); 3562 assert(LocT->getTypeClass() != T->getTypeClass() && 3563 "LocInfoType's TypeClass conflicts with an existing Type class"); 3564 return ParsedType::make(QualType(LocT, 0)); 3565} 3566 3567void LocInfoType::getAsStringInternal(std::string &Str, 3568 const PrintingPolicy &Policy) const { 3569 llvm_unreachable("LocInfoType leaked into the type system; an opaque TypeTy*" 3570 " was used directly instead of getting the QualType through" 3571 " GetTypeFromParser"); 3572} 3573 3574TypeResult Sema::ActOnTypeName(Scope *S, Declarator &D) { 3575 // C99 6.7.6: Type names have no identifier. This is already validated by 3576 // the parser. 3577 assert(D.getIdentifier() == 0 && "Type name should have no identifier!"); 3578 3579 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 3580 QualType T = TInfo->getType(); 3581 if (D.isInvalidType()) 3582 return true; 3583 3584 // Make sure there are no unused decl attributes on the declarator. 3585 // We don't want to do this for ObjC parameters because we're going 3586 // to apply them to the actual parameter declaration. 3587 // Likewise, we don't want to do this for alias declarations, because 3588 // we are actually going to build a declaration from this eventually. 3589 if (D.getContext() != Declarator::ObjCParameterContext && 3590 D.getContext() != Declarator::AliasDeclContext && 3591 D.getContext() != Declarator::AliasTemplateContext) 3592 checkUnusedDeclAttributes(D); 3593 3594 if (getLangOpts().CPlusPlus) { 3595 // Check that there are no default arguments (C++ only). 3596 CheckExtraCXXDefaultArguments(D); 3597 } 3598 3599 return CreateParsedType(T, TInfo); 3600} 3601 3602ParsedType Sema::ActOnObjCInstanceType(SourceLocation Loc) { 3603 QualType T = Context.getObjCInstanceType(); 3604 TypeSourceInfo *TInfo = Context.getTrivialTypeSourceInfo(T, Loc); 3605 return CreateParsedType(T, TInfo); 3606} 3607 3608 3609//===----------------------------------------------------------------------===// 3610// Type Attribute Processing 3611//===----------------------------------------------------------------------===// 3612 3613/// HandleAddressSpaceTypeAttribute - Process an address_space attribute on the 3614/// specified type. The attribute contains 1 argument, the id of the address 3615/// space for the type. 3616static void HandleAddressSpaceTypeAttribute(QualType &Type, 3617 const AttributeList &Attr, Sema &S){ 3618 3619 // If this type is already address space qualified, reject it. 3620 // ISO/IEC TR 18037 S5.3 (amending C99 6.7.3): "No type shall be qualified by 3621 // qualifiers for two or more different address spaces." 3622 if (Type.getAddressSpace()) { 3623 S.Diag(Attr.getLoc(), diag::err_attribute_address_multiple_qualifiers); 3624 Attr.setInvalid(); 3625 return; 3626 } 3627 3628 // ISO/IEC TR 18037 S5.3 (amending C99 6.7.3): "A function type shall not be 3629 // qualified by an address-space qualifier." 3630 if (Type->isFunctionType()) { 3631 S.Diag(Attr.getLoc(), diag::err_attribute_address_function_type); 3632 Attr.setInvalid(); 3633 return; 3634 } 3635 3636 // Check the attribute arguments. 3637 if (Attr.getNumArgs() != 1) { 3638 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 3639 Attr.setInvalid(); 3640 return; 3641 } 3642 Expr *ASArgExpr = static_cast<Expr *>(Attr.getArg(0)); 3643 llvm::APSInt addrSpace(32); 3644 if (ASArgExpr->isTypeDependent() || ASArgExpr->isValueDependent() || 3645 !ASArgExpr->isIntegerConstantExpr(addrSpace, S.Context)) { 3646 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_not_int) 3647 << ASArgExpr->getSourceRange(); 3648 Attr.setInvalid(); 3649 return; 3650 } 3651 3652 // Bounds checking. 3653 if (addrSpace.isSigned()) { 3654 if (addrSpace.isNegative()) { 3655 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_negative) 3656 << ASArgExpr->getSourceRange(); 3657 Attr.setInvalid(); 3658 return; 3659 } 3660 addrSpace.setIsSigned(false); 3661 } 3662 llvm::APSInt max(addrSpace.getBitWidth()); 3663 max = Qualifiers::MaxAddressSpace; 3664 if (addrSpace > max) { 3665 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_too_high) 3666 << Qualifiers::MaxAddressSpace << ASArgExpr->getSourceRange(); 3667 Attr.setInvalid(); 3668 return; 3669 } 3670 3671 unsigned ASIdx = static_cast<unsigned>(addrSpace.getZExtValue()); 3672 Type = S.Context.getAddrSpaceQualType(Type, ASIdx); 3673} 3674 3675/// Does this type have a "direct" ownership qualifier? That is, 3676/// is it written like "__strong id", as opposed to something like 3677/// "typeof(foo)", where that happens to be strong? 3678static bool hasDirectOwnershipQualifier(QualType type) { 3679 // Fast path: no qualifier at all. 3680 assert(type.getQualifiers().hasObjCLifetime()); 3681 3682 while (true) { 3683 // __strong id 3684 if (const AttributedType *attr = dyn_cast<AttributedType>(type)) { 3685 if (attr->getAttrKind() == AttributedType::attr_objc_ownership) 3686 return true; 3687 3688 type = attr->getModifiedType(); 3689 3690 // X *__strong (...) 3691 } else if (const ParenType *paren = dyn_cast<ParenType>(type)) { 3692 type = paren->getInnerType(); 3693 3694 // That's it for things we want to complain about. In particular, 3695 // we do not want to look through typedefs, typeof(expr), 3696 // typeof(type), or any other way that the type is somehow 3697 // abstracted. 3698 } else { 3699 3700 return false; 3701 } 3702 } 3703} 3704 3705/// handleObjCOwnershipTypeAttr - Process an objc_ownership 3706/// attribute on the specified type. 3707/// 3708/// Returns 'true' if the attribute was handled. 3709static bool handleObjCOwnershipTypeAttr(TypeProcessingState &state, 3710 AttributeList &attr, 3711 QualType &type) { 3712 bool NonObjCPointer = false; 3713 3714 if (!type->isDependentType()) { 3715 if (const PointerType *ptr = type->getAs<PointerType>()) { 3716 QualType pointee = ptr->getPointeeType(); 3717 if (pointee->isObjCRetainableType() || pointee->isPointerType()) 3718 return false; 3719 // It is important not to lose the source info that there was an attribute 3720 // applied to non-objc pointer. We will create an attributed type but 3721 // its type will be the same as the original type. 3722 NonObjCPointer = true; 3723 } else if (!type->isObjCRetainableType()) { 3724 return false; 3725 } 3726 3727 // Don't accept an ownership attribute in the declspec if it would 3728 // just be the return type of a block pointer. 3729 if (state.isProcessingDeclSpec()) { 3730 Declarator &D = state.getDeclarator(); 3731 if (maybeMovePastReturnType(D, D.getNumTypeObjects())) 3732 return false; 3733 } 3734 } 3735 3736 Sema &S = state.getSema(); 3737 SourceLocation AttrLoc = attr.getLoc(); 3738 if (AttrLoc.isMacroID()) 3739 AttrLoc = S.getSourceManager().getImmediateExpansionRange(AttrLoc).first; 3740 3741 if (!attr.getParameterName()) { 3742 S.Diag(AttrLoc, diag::err_attribute_argument_n_not_string) 3743 << "objc_ownership" << 1; 3744 attr.setInvalid(); 3745 return true; 3746 } 3747 3748 // Consume lifetime attributes without further comment outside of 3749 // ARC mode. 3750 if (!S.getLangOpts().ObjCAutoRefCount) 3751 return true; 3752 3753 Qualifiers::ObjCLifetime lifetime; 3754 if (attr.getParameterName()->isStr("none")) 3755 lifetime = Qualifiers::OCL_ExplicitNone; 3756 else if (attr.getParameterName()->isStr("strong")) 3757 lifetime = Qualifiers::OCL_Strong; 3758 else if (attr.getParameterName()->isStr("weak")) 3759 lifetime = Qualifiers::OCL_Weak; 3760 else if (attr.getParameterName()->isStr("autoreleasing")) 3761 lifetime = Qualifiers::OCL_Autoreleasing; 3762 else { 3763 S.Diag(AttrLoc, diag::warn_attribute_type_not_supported) 3764 << "objc_ownership" << attr.getParameterName(); 3765 attr.setInvalid(); 3766 return true; 3767 } 3768 3769 SplitQualType underlyingType = type.split(); 3770 3771 // Check for redundant/conflicting ownership qualifiers. 3772 if (Qualifiers::ObjCLifetime previousLifetime 3773 = type.getQualifiers().getObjCLifetime()) { 3774 // If it's written directly, that's an error. 3775 if (hasDirectOwnershipQualifier(type)) { 3776 S.Diag(AttrLoc, diag::err_attr_objc_ownership_redundant) 3777 << type; 3778 return true; 3779 } 3780 3781 // Otherwise, if the qualifiers actually conflict, pull sugar off 3782 // until we reach a type that is directly qualified. 3783 if (previousLifetime != lifetime) { 3784 // This should always terminate: the canonical type is 3785 // qualified, so some bit of sugar must be hiding it. 3786 while (!underlyingType.Quals.hasObjCLifetime()) { 3787 underlyingType = underlyingType.getSingleStepDesugaredType(); 3788 } 3789 underlyingType.Quals.removeObjCLifetime(); 3790 } 3791 } 3792 3793 underlyingType.Quals.addObjCLifetime(lifetime); 3794 3795 if (NonObjCPointer) { 3796 StringRef name = attr.getName()->getName(); 3797 switch (lifetime) { 3798 case Qualifiers::OCL_None: 3799 case Qualifiers::OCL_ExplicitNone: 3800 break; 3801 case Qualifiers::OCL_Strong: name = "__strong"; break; 3802 case Qualifiers::OCL_Weak: name = "__weak"; break; 3803 case Qualifiers::OCL_Autoreleasing: name = "__autoreleasing"; break; 3804 } 3805 S.Diag(AttrLoc, diag::warn_objc_object_attribute_wrong_type) 3806 << name << type; 3807 } 3808 3809 QualType origType = type; 3810 if (!NonObjCPointer) 3811 type = S.Context.getQualifiedType(underlyingType); 3812 3813 // If we have a valid source location for the attribute, use an 3814 // AttributedType instead. 3815 if (AttrLoc.isValid()) 3816 type = S.Context.getAttributedType(AttributedType::attr_objc_ownership, 3817 origType, type); 3818 3819 // Forbid __weak if the runtime doesn't support it. 3820 if (lifetime == Qualifiers::OCL_Weak && 3821 !S.getLangOpts().ObjCARCWeak && !NonObjCPointer) { 3822 3823 // Actually, delay this until we know what we're parsing. 3824 if (S.DelayedDiagnostics.shouldDelayDiagnostics()) { 3825 S.DelayedDiagnostics.add( 3826 sema::DelayedDiagnostic::makeForbiddenType( 3827 S.getSourceManager().getExpansionLoc(AttrLoc), 3828 diag::err_arc_weak_no_runtime, type, /*ignored*/ 0)); 3829 } else { 3830 S.Diag(AttrLoc, diag::err_arc_weak_no_runtime); 3831 } 3832 3833 attr.setInvalid(); 3834 return true; 3835 } 3836 3837 // Forbid __weak for class objects marked as 3838 // objc_arc_weak_reference_unavailable 3839 if (lifetime == Qualifiers::OCL_Weak) { 3840 if (const ObjCObjectPointerType *ObjT = 3841 type->getAs<ObjCObjectPointerType>()) { 3842 if (ObjCInterfaceDecl *Class = ObjT->getInterfaceDecl()) { 3843 if (Class->isArcWeakrefUnavailable()) { 3844 S.Diag(AttrLoc, diag::err_arc_unsupported_weak_class); 3845 S.Diag(ObjT->getInterfaceDecl()->getLocation(), 3846 diag::note_class_declared); 3847 } 3848 } 3849 } 3850 } 3851 3852 return true; 3853} 3854 3855/// handleObjCGCTypeAttr - Process the __attribute__((objc_gc)) type 3856/// attribute on the specified type. Returns true to indicate that 3857/// the attribute was handled, false to indicate that the type does 3858/// not permit the attribute. 3859static bool handleObjCGCTypeAttr(TypeProcessingState &state, 3860 AttributeList &attr, 3861 QualType &type) { 3862 Sema &S = state.getSema(); 3863 3864 // Delay if this isn't some kind of pointer. 3865 if (!type->isPointerType() && 3866 !type->isObjCObjectPointerType() && 3867 !type->isBlockPointerType()) 3868 return false; 3869 3870 if (type.getObjCGCAttr() != Qualifiers::GCNone) { 3871 S.Diag(attr.getLoc(), diag::err_attribute_multiple_objc_gc); 3872 attr.setInvalid(); 3873 return true; 3874 } 3875 3876 // Check the attribute arguments. 3877 if (!attr.getParameterName()) { 3878 S.Diag(attr.getLoc(), diag::err_attribute_argument_n_not_string) 3879 << "objc_gc" << 1; 3880 attr.setInvalid(); 3881 return true; 3882 } 3883 Qualifiers::GC GCAttr; 3884 if (attr.getNumArgs() != 0) { 3885 S.Diag(attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 3886 attr.setInvalid(); 3887 return true; 3888 } 3889 if (attr.getParameterName()->isStr("weak")) 3890 GCAttr = Qualifiers::Weak; 3891 else if (attr.getParameterName()->isStr("strong")) 3892 GCAttr = Qualifiers::Strong; 3893 else { 3894 S.Diag(attr.getLoc(), diag::warn_attribute_type_not_supported) 3895 << "objc_gc" << attr.getParameterName(); 3896 attr.setInvalid(); 3897 return true; 3898 } 3899 3900 QualType origType = type; 3901 type = S.Context.getObjCGCQualType(origType, GCAttr); 3902 3903 // Make an attributed type to preserve the source information. 3904 if (attr.getLoc().isValid()) 3905 type = S.Context.getAttributedType(AttributedType::attr_objc_gc, 3906 origType, type); 3907 3908 return true; 3909} 3910 3911namespace { 3912 /// A helper class to unwrap a type down to a function for the 3913 /// purposes of applying attributes there. 3914 /// 3915 /// Use: 3916 /// FunctionTypeUnwrapper unwrapped(SemaRef, T); 3917 /// if (unwrapped.isFunctionType()) { 3918 /// const FunctionType *fn = unwrapped.get(); 3919 /// // change fn somehow 3920 /// T = unwrapped.wrap(fn); 3921 /// } 3922 struct FunctionTypeUnwrapper { 3923 enum WrapKind { 3924 Desugar, 3925 Parens, 3926 Pointer, 3927 BlockPointer, 3928 Reference, 3929 MemberPointer 3930 }; 3931 3932 QualType Original; 3933 const FunctionType *Fn; 3934 SmallVector<unsigned char /*WrapKind*/, 8> Stack; 3935 3936 FunctionTypeUnwrapper(Sema &S, QualType T) : Original(T) { 3937 while (true) { 3938 const Type *Ty = T.getTypePtr(); 3939 if (isa<FunctionType>(Ty)) { 3940 Fn = cast<FunctionType>(Ty); 3941 return; 3942 } else if (isa<ParenType>(Ty)) { 3943 T = cast<ParenType>(Ty)->getInnerType(); 3944 Stack.push_back(Parens); 3945 } else if (isa<PointerType>(Ty)) { 3946 T = cast<PointerType>(Ty)->getPointeeType(); 3947 Stack.push_back(Pointer); 3948 } else if (isa<BlockPointerType>(Ty)) { 3949 T = cast<BlockPointerType>(Ty)->getPointeeType(); 3950 Stack.push_back(BlockPointer); 3951 } else if (isa<MemberPointerType>(Ty)) { 3952 T = cast<MemberPointerType>(Ty)->getPointeeType(); 3953 Stack.push_back(MemberPointer); 3954 } else if (isa<ReferenceType>(Ty)) { 3955 T = cast<ReferenceType>(Ty)->getPointeeType(); 3956 Stack.push_back(Reference); 3957 } else { 3958 const Type *DTy = Ty->getUnqualifiedDesugaredType(); 3959 if (Ty == DTy) { 3960 Fn = 0; 3961 return; 3962 } 3963 3964 T = QualType(DTy, 0); 3965 Stack.push_back(Desugar); 3966 } 3967 } 3968 } 3969 3970 bool isFunctionType() const { return (Fn != 0); } 3971 const FunctionType *get() const { return Fn; } 3972 3973 QualType wrap(Sema &S, const FunctionType *New) { 3974 // If T wasn't modified from the unwrapped type, do nothing. 3975 if (New == get()) return Original; 3976 3977 Fn = New; 3978 return wrap(S.Context, Original, 0); 3979 } 3980 3981 private: 3982 QualType wrap(ASTContext &C, QualType Old, unsigned I) { 3983 if (I == Stack.size()) 3984 return C.getQualifiedType(Fn, Old.getQualifiers()); 3985 3986 // Build up the inner type, applying the qualifiers from the old 3987 // type to the new type. 3988 SplitQualType SplitOld = Old.split(); 3989 3990 // As a special case, tail-recurse if there are no qualifiers. 3991 if (SplitOld.Quals.empty()) 3992 return wrap(C, SplitOld.Ty, I); 3993 return C.getQualifiedType(wrap(C, SplitOld.Ty, I), SplitOld.Quals); 3994 } 3995 3996 QualType wrap(ASTContext &C, const Type *Old, unsigned I) { 3997 if (I == Stack.size()) return QualType(Fn, 0); 3998 3999 switch (static_cast<WrapKind>(Stack[I++])) { 4000 case Desugar: 4001 // This is the point at which we potentially lose source 4002 // information. 4003 return wrap(C, Old->getUnqualifiedDesugaredType(), I); 4004 4005 case Parens: { 4006 QualType New = wrap(C, cast<ParenType>(Old)->getInnerType(), I); 4007 return C.getParenType(New); 4008 } 4009 4010 case Pointer: { 4011 QualType New = wrap(C, cast<PointerType>(Old)->getPointeeType(), I); 4012 return C.getPointerType(New); 4013 } 4014 4015 case BlockPointer: { 4016 QualType New = wrap(C, cast<BlockPointerType>(Old)->getPointeeType(),I); 4017 return C.getBlockPointerType(New); 4018 } 4019 4020 case MemberPointer: { 4021 const MemberPointerType *OldMPT = cast<MemberPointerType>(Old); 4022 QualType New = wrap(C, OldMPT->getPointeeType(), I); 4023 return C.getMemberPointerType(New, OldMPT->getClass()); 4024 } 4025 4026 case Reference: { 4027 const ReferenceType *OldRef = cast<ReferenceType>(Old); 4028 QualType New = wrap(C, OldRef->getPointeeType(), I); 4029 if (isa<LValueReferenceType>(OldRef)) 4030 return C.getLValueReferenceType(New, OldRef->isSpelledAsLValue()); 4031 else 4032 return C.getRValueReferenceType(New); 4033 } 4034 } 4035 4036 llvm_unreachable("unknown wrapping kind"); 4037 } 4038 }; 4039} 4040 4041/// Process an individual function attribute. Returns true to 4042/// indicate that the attribute was handled, false if it wasn't. 4043static bool handleFunctionTypeAttr(TypeProcessingState &state, 4044 AttributeList &attr, 4045 QualType &type) { 4046 Sema &S = state.getSema(); 4047 4048 FunctionTypeUnwrapper unwrapped(S, type); 4049 4050 if (attr.getKind() == AttributeList::AT_NoReturn) { 4051 if (S.CheckNoReturnAttr(attr)) 4052 return true; 4053 4054 // Delay if this is not a function type. 4055 if (!unwrapped.isFunctionType()) 4056 return false; 4057 4058 // Otherwise we can process right away. 4059 FunctionType::ExtInfo EI = unwrapped.get()->getExtInfo().withNoReturn(true); 4060 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 4061 return true; 4062 } 4063 4064 // ns_returns_retained is not always a type attribute, but if we got 4065 // here, we're treating it as one right now. 4066 if (attr.getKind() == AttributeList::AT_NSReturnsRetained) { 4067 assert(S.getLangOpts().ObjCAutoRefCount && 4068 "ns_returns_retained treated as type attribute in non-ARC"); 4069 if (attr.getNumArgs()) return true; 4070 4071 // Delay if this is not a function type. 4072 if (!unwrapped.isFunctionType()) 4073 return false; 4074 4075 FunctionType::ExtInfo EI 4076 = unwrapped.get()->getExtInfo().withProducesResult(true); 4077 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 4078 return true; 4079 } 4080 4081 if (attr.getKind() == AttributeList::AT_Regparm) { 4082 unsigned value; 4083 if (S.CheckRegparmAttr(attr, value)) 4084 return true; 4085 4086 // Delay if this is not a function type. 4087 if (!unwrapped.isFunctionType()) 4088 return false; 4089 4090 // Diagnose regparm with fastcall. 4091 const FunctionType *fn = unwrapped.get(); 4092 CallingConv CC = fn->getCallConv(); 4093 if (CC == CC_X86FastCall) { 4094 S.Diag(attr.getLoc(), diag::err_attributes_are_not_compatible) 4095 << FunctionType::getNameForCallConv(CC) 4096 << "regparm"; 4097 attr.setInvalid(); 4098 return true; 4099 } 4100 4101 FunctionType::ExtInfo EI = 4102 unwrapped.get()->getExtInfo().withRegParm(value); 4103 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 4104 return true; 4105 } 4106 4107 // Delay if the type didn't work out to a function. 4108 if (!unwrapped.isFunctionType()) return false; 4109 4110 // Otherwise, a calling convention. 4111 CallingConv CC; 4112 if (S.CheckCallingConvAttr(attr, CC)) 4113 return true; 4114 4115 const FunctionType *fn = unwrapped.get(); 4116 CallingConv CCOld = fn->getCallConv(); 4117 if (S.Context.getCanonicalCallConv(CC) == 4118 S.Context.getCanonicalCallConv(CCOld)) { 4119 FunctionType::ExtInfo EI= unwrapped.get()->getExtInfo().withCallingConv(CC); 4120 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 4121 return true; 4122 } 4123 4124 if (CCOld != (S.LangOpts.MRTD ? CC_X86StdCall : CC_Default)) { 4125 // Should we diagnose reapplications of the same convention? 4126 S.Diag(attr.getLoc(), diag::err_attributes_are_not_compatible) 4127 << FunctionType::getNameForCallConv(CC) 4128 << FunctionType::getNameForCallConv(CCOld); 4129 attr.setInvalid(); 4130 return true; 4131 } 4132 4133 // Diagnose the use of X86 fastcall on varargs or unprototyped functions. 4134 if (CC == CC_X86FastCall) { 4135 if (isa<FunctionNoProtoType>(fn)) { 4136 S.Diag(attr.getLoc(), diag::err_cconv_knr) 4137 << FunctionType::getNameForCallConv(CC); 4138 attr.setInvalid(); 4139 return true; 4140 } 4141 4142 const FunctionProtoType *FnP = cast<FunctionProtoType>(fn); 4143 if (FnP->isVariadic()) { 4144 S.Diag(attr.getLoc(), diag::err_cconv_varargs) 4145 << FunctionType::getNameForCallConv(CC); 4146 attr.setInvalid(); 4147 return true; 4148 } 4149 4150 // Also diagnose fastcall with regparm. 4151 if (fn->getHasRegParm()) { 4152 S.Diag(attr.getLoc(), diag::err_attributes_are_not_compatible) 4153 << "regparm" 4154 << FunctionType::getNameForCallConv(CC); 4155 attr.setInvalid(); 4156 return true; 4157 } 4158 } 4159 4160 FunctionType::ExtInfo EI = unwrapped.get()->getExtInfo().withCallingConv(CC); 4161 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 4162 return true; 4163} 4164 4165/// Handle OpenCL image access qualifiers: read_only, write_only, read_write 4166static void HandleOpenCLImageAccessAttribute(QualType& CurType, 4167 const AttributeList &Attr, 4168 Sema &S) { 4169 // Check the attribute arguments. 4170 if (Attr.getNumArgs() != 1) { 4171 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 4172 Attr.setInvalid(); 4173 return; 4174 } 4175 Expr *sizeExpr = static_cast<Expr *>(Attr.getArg(0)); 4176 llvm::APSInt arg(32); 4177 if (sizeExpr->isTypeDependent() || sizeExpr->isValueDependent() || 4178 !sizeExpr->isIntegerConstantExpr(arg, S.Context)) { 4179 S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int) 4180 << "opencl_image_access" << sizeExpr->getSourceRange(); 4181 Attr.setInvalid(); 4182 return; 4183 } 4184 unsigned iarg = static_cast<unsigned>(arg.getZExtValue()); 4185 switch (iarg) { 4186 case CLIA_read_only: 4187 case CLIA_write_only: 4188 case CLIA_read_write: 4189 // Implemented in a separate patch 4190 break; 4191 default: 4192 // Implemented in a separate patch 4193 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_size) 4194 << sizeExpr->getSourceRange(); 4195 Attr.setInvalid(); 4196 break; 4197 } 4198} 4199 4200/// HandleVectorSizeAttribute - this attribute is only applicable to integral 4201/// and float scalars, although arrays, pointers, and function return values are 4202/// allowed in conjunction with this construct. Aggregates with this attribute 4203/// are invalid, even if they are of the same size as a corresponding scalar. 4204/// The raw attribute should contain precisely 1 argument, the vector size for 4205/// the variable, measured in bytes. If curType and rawAttr are well formed, 4206/// this routine will return a new vector type. 4207static void HandleVectorSizeAttr(QualType& CurType, const AttributeList &Attr, 4208 Sema &S) { 4209 // Check the attribute arguments. 4210 if (Attr.getNumArgs() != 1) { 4211 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 4212 Attr.setInvalid(); 4213 return; 4214 } 4215 Expr *sizeExpr = static_cast<Expr *>(Attr.getArg(0)); 4216 llvm::APSInt vecSize(32); 4217 if (sizeExpr->isTypeDependent() || sizeExpr->isValueDependent() || 4218 !sizeExpr->isIntegerConstantExpr(vecSize, S.Context)) { 4219 S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int) 4220 << "vector_size" << sizeExpr->getSourceRange(); 4221 Attr.setInvalid(); 4222 return; 4223 } 4224 // the base type must be integer or float, and can't already be a vector. 4225 if (!CurType->isIntegerType() && !CurType->isRealFloatingType()) { 4226 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_vector_type) << CurType; 4227 Attr.setInvalid(); 4228 return; 4229 } 4230 unsigned typeSize = static_cast<unsigned>(S.Context.getTypeSize(CurType)); 4231 // vecSize is specified in bytes - convert to bits. 4232 unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue() * 8); 4233 4234 // the vector size needs to be an integral multiple of the type size. 4235 if (vectorSize % typeSize) { 4236 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_size) 4237 << sizeExpr->getSourceRange(); 4238 Attr.setInvalid(); 4239 return; 4240 } 4241 if (vectorSize == 0) { 4242 S.Diag(Attr.getLoc(), diag::err_attribute_zero_size) 4243 << sizeExpr->getSourceRange(); 4244 Attr.setInvalid(); 4245 return; 4246 } 4247 4248 // Success! Instantiate the vector type, the number of elements is > 0, and 4249 // not required to be a power of 2, unlike GCC. 4250 CurType = S.Context.getVectorType(CurType, vectorSize/typeSize, 4251 VectorType::GenericVector); 4252} 4253 4254/// \brief Process the OpenCL-like ext_vector_type attribute when it occurs on 4255/// a type. 4256static void HandleExtVectorTypeAttr(QualType &CurType, 4257 const AttributeList &Attr, 4258 Sema &S) { 4259 Expr *sizeExpr; 4260 4261 // Special case where the argument is a template id. 4262 if (Attr.getParameterName()) { 4263 CXXScopeSpec SS; 4264 SourceLocation TemplateKWLoc; 4265 UnqualifiedId id; 4266 id.setIdentifier(Attr.getParameterName(), Attr.getLoc()); 4267 4268 ExprResult Size = S.ActOnIdExpression(S.getCurScope(), SS, TemplateKWLoc, 4269 id, false, false); 4270 if (Size.isInvalid()) 4271 return; 4272 4273 sizeExpr = Size.get(); 4274 } else { 4275 // check the attribute arguments. 4276 if (Attr.getNumArgs() != 1) { 4277 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 4278 return; 4279 } 4280 sizeExpr = Attr.getArg(0); 4281 } 4282 4283 // Create the vector type. 4284 QualType T = S.BuildExtVectorType(CurType, sizeExpr, Attr.getLoc()); 4285 if (!T.isNull()) 4286 CurType = T; 4287} 4288 4289/// HandleNeonVectorTypeAttr - The "neon_vector_type" and 4290/// "neon_polyvector_type" attributes are used to create vector types that 4291/// are mangled according to ARM's ABI. Otherwise, these types are identical 4292/// to those created with the "vector_size" attribute. Unlike "vector_size" 4293/// the argument to these Neon attributes is the number of vector elements, 4294/// not the vector size in bytes. The vector width and element type must 4295/// match one of the standard Neon vector types. 4296static void HandleNeonVectorTypeAttr(QualType& CurType, 4297 const AttributeList &Attr, Sema &S, 4298 VectorType::VectorKind VecKind, 4299 const char *AttrName) { 4300 // Check the attribute arguments. 4301 if (Attr.getNumArgs() != 1) { 4302 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 4303 Attr.setInvalid(); 4304 return; 4305 } 4306 // The number of elements must be an ICE. 4307 Expr *numEltsExpr = static_cast<Expr *>(Attr.getArg(0)); 4308 llvm::APSInt numEltsInt(32); 4309 if (numEltsExpr->isTypeDependent() || numEltsExpr->isValueDependent() || 4310 !numEltsExpr->isIntegerConstantExpr(numEltsInt, S.Context)) { 4311 S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int) 4312 << AttrName << numEltsExpr->getSourceRange(); 4313 Attr.setInvalid(); 4314 return; 4315 } 4316 // Only certain element types are supported for Neon vectors. 4317 const BuiltinType* BTy = CurType->getAs<BuiltinType>(); 4318 if (!BTy || 4319 (VecKind == VectorType::NeonPolyVector && 4320 BTy->getKind() != BuiltinType::SChar && 4321 BTy->getKind() != BuiltinType::Short) || 4322 (BTy->getKind() != BuiltinType::SChar && 4323 BTy->getKind() != BuiltinType::UChar && 4324 BTy->getKind() != BuiltinType::Short && 4325 BTy->getKind() != BuiltinType::UShort && 4326 BTy->getKind() != BuiltinType::Int && 4327 BTy->getKind() != BuiltinType::UInt && 4328 BTy->getKind() != BuiltinType::LongLong && 4329 BTy->getKind() != BuiltinType::ULongLong && 4330 BTy->getKind() != BuiltinType::Float)) { 4331 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_vector_type) <<CurType; 4332 Attr.setInvalid(); 4333 return; 4334 } 4335 // The total size of the vector must be 64 or 128 bits. 4336 unsigned typeSize = static_cast<unsigned>(S.Context.getTypeSize(CurType)); 4337 unsigned numElts = static_cast<unsigned>(numEltsInt.getZExtValue()); 4338 unsigned vecSize = typeSize * numElts; 4339 if (vecSize != 64 && vecSize != 128) { 4340 S.Diag(Attr.getLoc(), diag::err_attribute_bad_neon_vector_size) << CurType; 4341 Attr.setInvalid(); 4342 return; 4343 } 4344 4345 CurType = S.Context.getVectorType(CurType, numElts, VecKind); 4346} 4347 4348static void processTypeAttrs(TypeProcessingState &state, QualType &type, 4349 TypeAttrLocation TAL, AttributeList *attrs) { 4350 // Scan through and apply attributes to this type where it makes sense. Some 4351 // attributes (such as __address_space__, __vector_size__, etc) apply to the 4352 // type, but others can be present in the type specifiers even though they 4353 // apply to the decl. Here we apply type attributes and ignore the rest. 4354 4355 AttributeList *next; 4356 do { 4357 AttributeList &attr = *attrs; 4358 next = attr.getNext(); 4359 4360 // Skip attributes that were marked to be invalid. 4361 if (attr.isInvalid()) 4362 continue; 4363 4364 if (attr.isCXX11Attribute()) { 4365 // [[gnu::...]] attributes are treated as declaration attributes, so may 4366 // not appertain to a DeclaratorChunk, even if we handle them as type 4367 // attributes. 4368 if (attr.getScopeName() && attr.getScopeName()->isStr("gnu")) { 4369 if (TAL == TAL_DeclChunk) { 4370 state.getSema().Diag(attr.getLoc(), 4371 diag::warn_cxx11_gnu_attribute_on_type) 4372 << attr.getName(); 4373 continue; 4374 } 4375 } else if (TAL != TAL_DeclChunk) { 4376 // Otherwise, only consider type processing for a C++11 attribute if 4377 // it's actually been applied to a type. 4378 continue; 4379 } 4380 } 4381 4382 // If this is an attribute we can handle, do so now, 4383 // otherwise, add it to the FnAttrs list for rechaining. 4384 switch (attr.getKind()) { 4385 default: 4386 // A C++11 attribute on a declarator chunk must appertain to a type. 4387 if (attr.isCXX11Attribute() && TAL == TAL_DeclChunk) { 4388 state.getSema().Diag(attr.getLoc(), diag::err_attribute_not_type_attr) 4389 << attr.getName(); 4390 attr.setUsedAsTypeAttr(); 4391 } 4392 break; 4393 4394 case AttributeList::UnknownAttribute: 4395 if (attr.isCXX11Attribute() && TAL == TAL_DeclChunk) 4396 state.getSema().Diag(attr.getLoc(), 4397 diag::warn_unknown_attribute_ignored) 4398 << attr.getName(); 4399 break; 4400 4401 case AttributeList::IgnoredAttribute: 4402 break; 4403 4404 case AttributeList::AT_MayAlias: 4405 // FIXME: This attribute needs to actually be handled, but if we ignore 4406 // it it breaks large amounts of Linux software. 4407 attr.setUsedAsTypeAttr(); 4408 break; 4409 case AttributeList::AT_AddressSpace: 4410 HandleAddressSpaceTypeAttribute(type, attr, state.getSema()); 4411 attr.setUsedAsTypeAttr(); 4412 break; 4413 OBJC_POINTER_TYPE_ATTRS_CASELIST: 4414 if (!handleObjCPointerTypeAttr(state, attr, type)) 4415 distributeObjCPointerTypeAttr(state, attr, type); 4416 attr.setUsedAsTypeAttr(); 4417 break; 4418 case AttributeList::AT_VectorSize: 4419 HandleVectorSizeAttr(type, attr, state.getSema()); 4420 attr.setUsedAsTypeAttr(); 4421 break; 4422 case AttributeList::AT_ExtVectorType: 4423 HandleExtVectorTypeAttr(type, attr, state.getSema()); 4424 attr.setUsedAsTypeAttr(); 4425 break; 4426 case AttributeList::AT_NeonVectorType: 4427 HandleNeonVectorTypeAttr(type, attr, state.getSema(), 4428 VectorType::NeonVector, "neon_vector_type"); 4429 attr.setUsedAsTypeAttr(); 4430 break; 4431 case AttributeList::AT_NeonPolyVectorType: 4432 HandleNeonVectorTypeAttr(type, attr, state.getSema(), 4433 VectorType::NeonPolyVector, 4434 "neon_polyvector_type"); 4435 attr.setUsedAsTypeAttr(); 4436 break; 4437 case AttributeList::AT_OpenCLImageAccess: 4438 HandleOpenCLImageAccessAttribute(type, attr, state.getSema()); 4439 attr.setUsedAsTypeAttr(); 4440 break; 4441 4442 case AttributeList::AT_Win64: 4443 case AttributeList::AT_Ptr32: 4444 case AttributeList::AT_Ptr64: 4445 // FIXME: Don't ignore these. We have partial handling for them as 4446 // declaration attributes in SemaDeclAttr.cpp; that should be moved here. 4447 attr.setUsedAsTypeAttr(); 4448 break; 4449 4450 case AttributeList::AT_NSReturnsRetained: 4451 if (!state.getSema().getLangOpts().ObjCAutoRefCount) 4452 break; 4453 // fallthrough into the function attrs 4454 4455 FUNCTION_TYPE_ATTRS_CASELIST: 4456 attr.setUsedAsTypeAttr(); 4457 4458 // Never process function type attributes as part of the 4459 // declaration-specifiers. 4460 if (TAL == TAL_DeclSpec) 4461 distributeFunctionTypeAttrFromDeclSpec(state, attr, type); 4462 4463 // Otherwise, handle the possible delays. 4464 else if (!handleFunctionTypeAttr(state, attr, type)) 4465 distributeFunctionTypeAttr(state, attr, type); 4466 break; 4467 } 4468 } while ((attrs = next)); 4469} 4470 4471/// \brief Ensure that the type of the given expression is complete. 4472/// 4473/// This routine checks whether the expression \p E has a complete type. If the 4474/// expression refers to an instantiable construct, that instantiation is 4475/// performed as needed to complete its type. Furthermore 4476/// Sema::RequireCompleteType is called for the expression's type (or in the 4477/// case of a reference type, the referred-to type). 4478/// 4479/// \param E The expression whose type is required to be complete. 4480/// \param Diagnoser The object that will emit a diagnostic if the type is 4481/// incomplete. 4482/// 4483/// \returns \c true if the type of \p E is incomplete and diagnosed, \c false 4484/// otherwise. 4485bool Sema::RequireCompleteExprType(Expr *E, TypeDiagnoser &Diagnoser){ 4486 QualType T = E->getType(); 4487 4488 // Fast path the case where the type is already complete. 4489 if (!T->isIncompleteType()) 4490 return false; 4491 4492 // Incomplete array types may be completed by the initializer attached to 4493 // their definitions. For static data members of class templates we need to 4494 // instantiate the definition to get this initializer and complete the type. 4495 if (T->isIncompleteArrayType()) { 4496 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E->IgnoreParens())) { 4497 if (VarDecl *Var = dyn_cast<VarDecl>(DRE->getDecl())) { 4498 if (Var->isStaticDataMember() && 4499 Var->getInstantiatedFromStaticDataMember()) { 4500 4501 MemberSpecializationInfo *MSInfo = Var->getMemberSpecializationInfo(); 4502 assert(MSInfo && "Missing member specialization information?"); 4503 if (MSInfo->getTemplateSpecializationKind() 4504 != TSK_ExplicitSpecialization) { 4505 // If we don't already have a point of instantiation, this is it. 4506 if (MSInfo->getPointOfInstantiation().isInvalid()) { 4507 MSInfo->setPointOfInstantiation(E->getLocStart()); 4508 4509 // This is a modification of an existing AST node. Notify 4510 // listeners. 4511 if (ASTMutationListener *L = getASTMutationListener()) 4512 L->StaticDataMemberInstantiated(Var); 4513 } 4514 4515 InstantiateStaticDataMemberDefinition(E->getExprLoc(), Var); 4516 4517 // Update the type to the newly instantiated definition's type both 4518 // here and within the expression. 4519 if (VarDecl *Def = Var->getDefinition()) { 4520 DRE->setDecl(Def); 4521 T = Def->getType(); 4522 DRE->setType(T); 4523 E->setType(T); 4524 } 4525 } 4526 4527 // We still go on to try to complete the type independently, as it 4528 // may also require instantiations or diagnostics if it remains 4529 // incomplete. 4530 } 4531 } 4532 } 4533 } 4534 4535 // FIXME: Are there other cases which require instantiating something other 4536 // than the type to complete the type of an expression? 4537 4538 // Look through reference types and complete the referred type. 4539 if (const ReferenceType *Ref = T->getAs<ReferenceType>()) 4540 T = Ref->getPointeeType(); 4541 4542 return RequireCompleteType(E->getExprLoc(), T, Diagnoser); 4543} 4544 4545namespace { 4546 struct TypeDiagnoserDiag : Sema::TypeDiagnoser { 4547 unsigned DiagID; 4548 4549 TypeDiagnoserDiag(unsigned DiagID) 4550 : Sema::TypeDiagnoser(DiagID == 0), DiagID(DiagID) {} 4551 4552 virtual void diagnose(Sema &S, SourceLocation Loc, QualType T) { 4553 if (Suppressed) return; 4554 S.Diag(Loc, DiagID) << T; 4555 } 4556 }; 4557} 4558 4559bool Sema::RequireCompleteExprType(Expr *E, unsigned DiagID) { 4560 TypeDiagnoserDiag Diagnoser(DiagID); 4561 return RequireCompleteExprType(E, Diagnoser); 4562} 4563 4564/// @brief Ensure that the type T is a complete type. 4565/// 4566/// This routine checks whether the type @p T is complete in any 4567/// context where a complete type is required. If @p T is a complete 4568/// type, returns false. If @p T is a class template specialization, 4569/// this routine then attempts to perform class template 4570/// instantiation. If instantiation fails, or if @p T is incomplete 4571/// and cannot be completed, issues the diagnostic @p diag (giving it 4572/// the type @p T) and returns true. 4573/// 4574/// @param Loc The location in the source that the incomplete type 4575/// diagnostic should refer to. 4576/// 4577/// @param T The type that this routine is examining for completeness. 4578/// 4579/// @returns @c true if @p T is incomplete and a diagnostic was emitted, 4580/// @c false otherwise. 4581bool Sema::RequireCompleteType(SourceLocation Loc, QualType T, 4582 TypeDiagnoser &Diagnoser) { 4583 // FIXME: Add this assertion to make sure we always get instantiation points. 4584 // assert(!Loc.isInvalid() && "Invalid location in RequireCompleteType"); 4585 // FIXME: Add this assertion to help us flush out problems with 4586 // checking for dependent types and type-dependent expressions. 4587 // 4588 // assert(!T->isDependentType() && 4589 // "Can't ask whether a dependent type is complete"); 4590 4591 // If we have a complete type, we're done. 4592 NamedDecl *Def = 0; 4593 if (!T->isIncompleteType(&Def)) { 4594 // If we know about the definition but it is not visible, complain. 4595 if (!Diagnoser.Suppressed && Def && !LookupResult::isVisible(Def)) { 4596 // Suppress this error outside of a SFINAE context if we've already 4597 // emitted the error once for this type. There's no usefulness in 4598 // repeating the diagnostic. 4599 // FIXME: Add a Fix-It that imports the corresponding module or includes 4600 // the header. 4601 Module *Owner = Def->getOwningModule(); 4602 Diag(Loc, diag::err_module_private_definition) 4603 << T << Owner->getFullModuleName(); 4604 Diag(Def->getLocation(), diag::note_previous_definition); 4605 4606 if (!isSFINAEContext()) { 4607 // Recover by implicitly importing this module. 4608 createImplicitModuleImport(Loc, Owner); 4609 } 4610 } 4611 4612 return false; 4613 } 4614 4615 const TagType *Tag = T->getAs<TagType>(); 4616 const ObjCInterfaceType *IFace = 0; 4617 4618 if (Tag) { 4619 // Avoid diagnosing invalid decls as incomplete. 4620 if (Tag->getDecl()->isInvalidDecl()) 4621 return true; 4622 4623 // Give the external AST source a chance to complete the type. 4624 if (Tag->getDecl()->hasExternalLexicalStorage()) { 4625 Context.getExternalSource()->CompleteType(Tag->getDecl()); 4626 if (!Tag->isIncompleteType()) 4627 return false; 4628 } 4629 } 4630 else if ((IFace = T->getAs<ObjCInterfaceType>())) { 4631 // Avoid diagnosing invalid decls as incomplete. 4632 if (IFace->getDecl()->isInvalidDecl()) 4633 return true; 4634 4635 // Give the external AST source a chance to complete the type. 4636 if (IFace->getDecl()->hasExternalLexicalStorage()) { 4637 Context.getExternalSource()->CompleteType(IFace->getDecl()); 4638 if (!IFace->isIncompleteType()) 4639 return false; 4640 } 4641 } 4642 4643 // If we have a class template specialization or a class member of a 4644 // class template specialization, or an array with known size of such, 4645 // try to instantiate it. 4646 QualType MaybeTemplate = T; 4647 while (const ConstantArrayType *Array 4648 = Context.getAsConstantArrayType(MaybeTemplate)) 4649 MaybeTemplate = Array->getElementType(); 4650 if (const RecordType *Record = MaybeTemplate->getAs<RecordType>()) { 4651 if (ClassTemplateSpecializationDecl *ClassTemplateSpec 4652 = dyn_cast<ClassTemplateSpecializationDecl>(Record->getDecl())) { 4653 if (ClassTemplateSpec->getSpecializationKind() == TSK_Undeclared) 4654 return InstantiateClassTemplateSpecialization(Loc, ClassTemplateSpec, 4655 TSK_ImplicitInstantiation, 4656 /*Complain=*/!Diagnoser.Suppressed); 4657 } else if (CXXRecordDecl *Rec 4658 = dyn_cast<CXXRecordDecl>(Record->getDecl())) { 4659 CXXRecordDecl *Pattern = Rec->getInstantiatedFromMemberClass(); 4660 if (!Rec->isBeingDefined() && Pattern) { 4661 MemberSpecializationInfo *MSI = Rec->getMemberSpecializationInfo(); 4662 assert(MSI && "Missing member specialization information?"); 4663 // This record was instantiated from a class within a template. 4664 if (MSI->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 4665 return InstantiateClass(Loc, Rec, Pattern, 4666 getTemplateInstantiationArgs(Rec), 4667 TSK_ImplicitInstantiation, 4668 /*Complain=*/!Diagnoser.Suppressed); 4669 } 4670 } 4671 } 4672 4673 if (Diagnoser.Suppressed) 4674 return true; 4675 4676 // We have an incomplete type. Produce a diagnostic. 4677 Diagnoser.diagnose(*this, Loc, T); 4678 4679 // If the type was a forward declaration of a class/struct/union 4680 // type, produce a note. 4681 if (Tag && !Tag->getDecl()->isInvalidDecl()) 4682 Diag(Tag->getDecl()->getLocation(), 4683 Tag->isBeingDefined() ? diag::note_type_being_defined 4684 : diag::note_forward_declaration) 4685 << QualType(Tag, 0); 4686 4687 // If the Objective-C class was a forward declaration, produce a note. 4688 if (IFace && !IFace->getDecl()->isInvalidDecl()) 4689 Diag(IFace->getDecl()->getLocation(), diag::note_forward_class); 4690 4691 return true; 4692} 4693 4694bool Sema::RequireCompleteType(SourceLocation Loc, QualType T, 4695 unsigned DiagID) { 4696 TypeDiagnoserDiag Diagnoser(DiagID); 4697 return RequireCompleteType(Loc, T, Diagnoser); 4698} 4699 4700/// \brief Get diagnostic %select index for tag kind for 4701/// literal type diagnostic message. 4702/// WARNING: Indexes apply to particular diagnostics only! 4703/// 4704/// \returns diagnostic %select index. 4705static unsigned getLiteralDiagFromTagKind(TagTypeKind Tag) { 4706 switch (Tag) { 4707 case TTK_Struct: return 0; 4708 case TTK_Interface: return 1; 4709 case TTK_Class: return 2; 4710 default: llvm_unreachable("Invalid tag kind for literal type diagnostic!"); 4711 } 4712} 4713 4714/// @brief Ensure that the type T is a literal type. 4715/// 4716/// This routine checks whether the type @p T is a literal type. If @p T is an 4717/// incomplete type, an attempt is made to complete it. If @p T is a literal 4718/// type, or @p AllowIncompleteType is true and @p T is an incomplete type, 4719/// returns false. Otherwise, this routine issues the diagnostic @p PD (giving 4720/// it the type @p T), along with notes explaining why the type is not a 4721/// literal type, and returns true. 4722/// 4723/// @param Loc The location in the source that the non-literal type 4724/// diagnostic should refer to. 4725/// 4726/// @param T The type that this routine is examining for literalness. 4727/// 4728/// @param Diagnoser Emits a diagnostic if T is not a literal type. 4729/// 4730/// @returns @c true if @p T is not a literal type and a diagnostic was emitted, 4731/// @c false otherwise. 4732bool Sema::RequireLiteralType(SourceLocation Loc, QualType T, 4733 TypeDiagnoser &Diagnoser) { 4734 assert(!T->isDependentType() && "type should not be dependent"); 4735 4736 QualType ElemType = Context.getBaseElementType(T); 4737 RequireCompleteType(Loc, ElemType, 0); 4738 4739 if (T->isLiteralType()) 4740 return false; 4741 4742 if (Diagnoser.Suppressed) 4743 return true; 4744 4745 Diagnoser.diagnose(*this, Loc, T); 4746 4747 if (T->isVariableArrayType()) 4748 return true; 4749 4750 const RecordType *RT = ElemType->getAs<RecordType>(); 4751 if (!RT) 4752 return true; 4753 4754 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 4755 4756 // A partially-defined class type can't be a literal type, because a literal 4757 // class type must have a trivial destructor (which can't be checked until 4758 // the class definition is complete). 4759 if (!RD->isCompleteDefinition()) { 4760 RequireCompleteType(Loc, ElemType, diag::note_non_literal_incomplete, T); 4761 return true; 4762 } 4763 4764 // If the class has virtual base classes, then it's not an aggregate, and 4765 // cannot have any constexpr constructors or a trivial default constructor, 4766 // so is non-literal. This is better to diagnose than the resulting absence 4767 // of constexpr constructors. 4768 if (RD->getNumVBases()) { 4769 Diag(RD->getLocation(), diag::note_non_literal_virtual_base) 4770 << getLiteralDiagFromTagKind(RD->getTagKind()) << RD->getNumVBases(); 4771 for (CXXRecordDecl::base_class_const_iterator I = RD->vbases_begin(), 4772 E = RD->vbases_end(); I != E; ++I) 4773 Diag(I->getLocStart(), 4774 diag::note_constexpr_virtual_base_here) << I->getSourceRange(); 4775 } else if (!RD->isAggregate() && !RD->hasConstexprNonCopyMoveConstructor() && 4776 !RD->hasTrivialDefaultConstructor()) { 4777 Diag(RD->getLocation(), diag::note_non_literal_no_constexpr_ctors) << RD; 4778 } else if (RD->hasNonLiteralTypeFieldsOrBases()) { 4779 for (CXXRecordDecl::base_class_const_iterator I = RD->bases_begin(), 4780 E = RD->bases_end(); I != E; ++I) { 4781 if (!I->getType()->isLiteralType()) { 4782 Diag(I->getLocStart(), 4783 diag::note_non_literal_base_class) 4784 << RD << I->getType() << I->getSourceRange(); 4785 return true; 4786 } 4787 } 4788 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 4789 E = RD->field_end(); I != E; ++I) { 4790 if (!I->getType()->isLiteralType() || 4791 I->getType().isVolatileQualified()) { 4792 Diag(I->getLocation(), diag::note_non_literal_field) 4793 << RD << *I << I->getType() 4794 << I->getType().isVolatileQualified(); 4795 return true; 4796 } 4797 } 4798 } else if (!RD->hasTrivialDestructor()) { 4799 // All fields and bases are of literal types, so have trivial destructors. 4800 // If this class's destructor is non-trivial it must be user-declared. 4801 CXXDestructorDecl *Dtor = RD->getDestructor(); 4802 assert(Dtor && "class has literal fields and bases but no dtor?"); 4803 if (!Dtor) 4804 return true; 4805 4806 Diag(Dtor->getLocation(), Dtor->isUserProvided() ? 4807 diag::note_non_literal_user_provided_dtor : 4808 diag::note_non_literal_nontrivial_dtor) << RD; 4809 if (!Dtor->isUserProvided()) 4810 SpecialMemberIsTrivial(Dtor, CXXDestructor, /*Diagnose*/true); 4811 } 4812 4813 return true; 4814} 4815 4816bool Sema::RequireLiteralType(SourceLocation Loc, QualType T, unsigned DiagID) { 4817 TypeDiagnoserDiag Diagnoser(DiagID); 4818 return RequireLiteralType(Loc, T, Diagnoser); 4819} 4820 4821/// \brief Retrieve a version of the type 'T' that is elaborated by Keyword 4822/// and qualified by the nested-name-specifier contained in SS. 4823QualType Sema::getElaboratedType(ElaboratedTypeKeyword Keyword, 4824 const CXXScopeSpec &SS, QualType T) { 4825 if (T.isNull()) 4826 return T; 4827 NestedNameSpecifier *NNS; 4828 if (SS.isValid()) 4829 NNS = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 4830 else { 4831 if (Keyword == ETK_None) 4832 return T; 4833 NNS = 0; 4834 } 4835 return Context.getElaboratedType(Keyword, NNS, T); 4836} 4837 4838QualType Sema::BuildTypeofExprType(Expr *E, SourceLocation Loc) { 4839 ExprResult ER = CheckPlaceholderExpr(E); 4840 if (ER.isInvalid()) return QualType(); 4841 E = ER.take(); 4842 4843 if (!E->isTypeDependent()) { 4844 QualType T = E->getType(); 4845 if (const TagType *TT = T->getAs<TagType>()) 4846 DiagnoseUseOfDecl(TT->getDecl(), E->getExprLoc()); 4847 } 4848 return Context.getTypeOfExprType(E); 4849} 4850 4851/// getDecltypeForExpr - Given an expr, will return the decltype for 4852/// that expression, according to the rules in C++11 4853/// [dcl.type.simple]p4 and C++11 [expr.lambda.prim]p18. 4854static QualType getDecltypeForExpr(Sema &S, Expr *E) { 4855 if (E->isTypeDependent()) 4856 return S.Context.DependentTy; 4857 4858 // C++11 [dcl.type.simple]p4: 4859 // The type denoted by decltype(e) is defined as follows: 4860 // 4861 // - if e is an unparenthesized id-expression or an unparenthesized class 4862 // member access (5.2.5), decltype(e) is the type of the entity named 4863 // by e. If there is no such entity, or if e names a set of overloaded 4864 // functions, the program is ill-formed; 4865 // 4866 // We apply the same rules for Objective-C ivar and property references. 4867 if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E)) { 4868 if (const ValueDecl *VD = dyn_cast<ValueDecl>(DRE->getDecl())) 4869 return VD->getType(); 4870 } else if (const MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 4871 if (const FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl())) 4872 return FD->getType(); 4873 } else if (const ObjCIvarRefExpr *IR = dyn_cast<ObjCIvarRefExpr>(E)) { 4874 return IR->getDecl()->getType(); 4875 } else if (const ObjCPropertyRefExpr *PR = dyn_cast<ObjCPropertyRefExpr>(E)) { 4876 if (PR->isExplicitProperty()) 4877 return PR->getExplicitProperty()->getType(); 4878 } 4879 4880 // C++11 [expr.lambda.prim]p18: 4881 // Every occurrence of decltype((x)) where x is a possibly 4882 // parenthesized id-expression that names an entity of automatic 4883 // storage duration is treated as if x were transformed into an 4884 // access to a corresponding data member of the closure type that 4885 // would have been declared if x were an odr-use of the denoted 4886 // entity. 4887 using namespace sema; 4888 if (S.getCurLambda()) { 4889 if (isa<ParenExpr>(E)) { 4890 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E->IgnoreParens())) { 4891 if (VarDecl *Var = dyn_cast<VarDecl>(DRE->getDecl())) { 4892 QualType T = S.getCapturedDeclRefType(Var, DRE->getLocation()); 4893 if (!T.isNull()) 4894 return S.Context.getLValueReferenceType(T); 4895 } 4896 } 4897 } 4898 } 4899 4900 4901 // C++11 [dcl.type.simple]p4: 4902 // [...] 4903 QualType T = E->getType(); 4904 switch (E->getValueKind()) { 4905 // - otherwise, if e is an xvalue, decltype(e) is T&&, where T is the 4906 // type of e; 4907 case VK_XValue: T = S.Context.getRValueReferenceType(T); break; 4908 // - otherwise, if e is an lvalue, decltype(e) is T&, where T is the 4909 // type of e; 4910 case VK_LValue: T = S.Context.getLValueReferenceType(T); break; 4911 // - otherwise, decltype(e) is the type of e. 4912 case VK_RValue: break; 4913 } 4914 4915 return T; 4916} 4917 4918QualType Sema::BuildDecltypeType(Expr *E, SourceLocation Loc) { 4919 ExprResult ER = CheckPlaceholderExpr(E); 4920 if (ER.isInvalid()) return QualType(); 4921 E = ER.take(); 4922 4923 return Context.getDecltypeType(E, getDecltypeForExpr(*this, E)); 4924} 4925 4926QualType Sema::BuildUnaryTransformType(QualType BaseType, 4927 UnaryTransformType::UTTKind UKind, 4928 SourceLocation Loc) { 4929 switch (UKind) { 4930 case UnaryTransformType::EnumUnderlyingType: 4931 if (!BaseType->isDependentType() && !BaseType->isEnumeralType()) { 4932 Diag(Loc, diag::err_only_enums_have_underlying_types); 4933 return QualType(); 4934 } else { 4935 QualType Underlying = BaseType; 4936 if (!BaseType->isDependentType()) { 4937 EnumDecl *ED = BaseType->getAs<EnumType>()->getDecl(); 4938 assert(ED && "EnumType has no EnumDecl"); 4939 DiagnoseUseOfDecl(ED, Loc); 4940 Underlying = ED->getIntegerType(); 4941 } 4942 assert(!Underlying.isNull()); 4943 return Context.getUnaryTransformType(BaseType, Underlying, 4944 UnaryTransformType::EnumUnderlyingType); 4945 } 4946 } 4947 llvm_unreachable("unknown unary transform type"); 4948} 4949 4950QualType Sema::BuildAtomicType(QualType T, SourceLocation Loc) { 4951 if (!T->isDependentType()) { 4952 // FIXME: It isn't entirely clear whether incomplete atomic types 4953 // are allowed or not; for simplicity, ban them for the moment. 4954 if (RequireCompleteType(Loc, T, diag::err_atomic_specifier_bad_type, 0)) 4955 return QualType(); 4956 4957 int DisallowedKind = -1; 4958 if (T->isArrayType()) 4959 DisallowedKind = 1; 4960 else if (T->isFunctionType()) 4961 DisallowedKind = 2; 4962 else if (T->isReferenceType()) 4963 DisallowedKind = 3; 4964 else if (T->isAtomicType()) 4965 DisallowedKind = 4; 4966 else if (T.hasQualifiers()) 4967 DisallowedKind = 5; 4968 else if (!T.isTriviallyCopyableType(Context)) 4969 // Some other non-trivially-copyable type (probably a C++ class) 4970 DisallowedKind = 6; 4971 4972 if (DisallowedKind != -1) { 4973 Diag(Loc, diag::err_atomic_specifier_bad_type) << DisallowedKind << T; 4974 return QualType(); 4975 } 4976 4977 // FIXME: Do we need any handling for ARC here? 4978 } 4979 4980 // Build the pointer type. 4981 return Context.getAtomicType(T); 4982} 4983