SemaType.cpp revision b7165589b2eafc4b48d09a5914e21604ae580256
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/ASTConsumer.h" 16#include "clang/AST/ASTContext.h" 17#include "clang/AST/ASTMutationListener.h" 18#include "clang/AST/CXXInheritance.h" 19#include "clang/AST/DeclObjC.h" 20#include "clang/AST/DeclTemplate.h" 21#include "clang/AST/Expr.h" 22#include "clang/AST/TypeLoc.h" 23#include "clang/AST/TypeLocVisitor.h" 24#include "clang/Basic/OpenCL.h" 25#include "clang/Basic/PartialDiagnostic.h" 26#include "clang/Basic/TargetInfo.h" 27#include "clang/Lex/Preprocessor.h" 28#include "clang/Parse/ParseDiagnostic.h" 29#include "clang/Sema/DeclSpec.h" 30#include "clang/Sema/DelayedDiagnostic.h" 31#include "clang/Sema/Lookup.h" 32#include "clang/Sema/ScopeInfo.h" 33#include "clang/Sema/Template.h" 34#include "llvm/ADT/SmallPtrSet.h" 35#include "llvm/ADT/SmallString.h" 36#include "llvm/Support/ErrorHandling.h" 37#include "TypeLocBuilder.h" 38 39using namespace clang; 40 41enum TypeDiagSelector { 42 TDS_Function, 43 TDS_Pointer, 44 TDS_ObjCObjOrBlock 45}; 46 47/// isOmittedBlockReturnType - Return true if this declarator is missing a 48/// return type because this is a omitted return type on a block literal. 49static bool isOmittedBlockReturnType(const Declarator &D) { 50 if (D.getContext() != Declarator::BlockLiteralContext || 51 D.getDeclSpec().hasTypeSpecifier()) 52 return false; 53 54 if (D.getNumTypeObjects() == 0) 55 return true; // ^{ ... } 56 57 if (D.getNumTypeObjects() == 1 && 58 D.getTypeObject(0).Kind == DeclaratorChunk::Function) 59 return true; // ^(int X, float Y) { ... } 60 61 return false; 62} 63 64/// diagnoseBadTypeAttribute - Diagnoses a type attribute which 65/// doesn't apply to the given type. 66static void diagnoseBadTypeAttribute(Sema &S, const AttributeList &attr, 67 QualType type) { 68 TypeDiagSelector WhichType; 69 bool useExpansionLoc = true; 70 switch (attr.getKind()) { 71 case AttributeList::AT_ObjCGC: WhichType = TDS_Pointer; break; 72 case AttributeList::AT_ObjCOwnership: WhichType = TDS_ObjCObjOrBlock; break; 73 default: 74 // Assume everything else was a function attribute. 75 WhichType = TDS_Function; 76 useExpansionLoc = false; 77 break; 78 } 79 80 SourceLocation loc = attr.getLoc(); 81 StringRef name = attr.getName()->getName(); 82 83 // The GC attributes are usually written with macros; special-case them. 84 IdentifierInfo *II = attr.isArgIdent(0) ? attr.getArgAsIdent(0)->Ident : 0; 85 if (useExpansionLoc && loc.isMacroID() && II) { 86 if (II->isStr("strong")) { 87 if (S.findMacroSpelling(loc, "__strong")) name = "__strong"; 88 } else if (II->isStr("weak")) { 89 if (S.findMacroSpelling(loc, "__weak")) name = "__weak"; 90 } 91 } 92 93 S.Diag(loc, diag::warn_type_attribute_wrong_type) << name << WhichType 94 << type; 95} 96 97// objc_gc applies to Objective-C pointers or, otherwise, to the 98// smallest available pointer type (i.e. 'void*' in 'void**'). 99#define OBJC_POINTER_TYPE_ATTRS_CASELIST \ 100 case AttributeList::AT_ObjCGC: \ 101 case AttributeList::AT_ObjCOwnership 102 103// Function type attributes. 104#define FUNCTION_TYPE_ATTRS_CASELIST \ 105 case AttributeList::AT_NoReturn: \ 106 case AttributeList::AT_CDecl: \ 107 case AttributeList::AT_FastCall: \ 108 case AttributeList::AT_StdCall: \ 109 case AttributeList::AT_ThisCall: \ 110 case AttributeList::AT_Pascal: \ 111 case AttributeList::AT_MSABI: \ 112 case AttributeList::AT_SysVABI: \ 113 case AttributeList::AT_Regparm: \ 114 case AttributeList::AT_Pcs: \ 115 case AttributeList::AT_PnaclCall: \ 116 case AttributeList::AT_IntelOclBicc 117 118// Microsoft-specific type qualifiers. 119#define MS_TYPE_ATTRS_CASELIST \ 120 case AttributeList::AT_Ptr32: \ 121 case AttributeList::AT_Ptr64: \ 122 case AttributeList::AT_SPtr: \ 123 case AttributeList::AT_UPtr 124 125namespace { 126 /// An object which stores processing state for the entire 127 /// GetTypeForDeclarator process. 128 class TypeProcessingState { 129 Sema &sema; 130 131 /// The declarator being processed. 132 Declarator &declarator; 133 134 /// The index of the declarator chunk we're currently processing. 135 /// May be the total number of valid chunks, indicating the 136 /// DeclSpec. 137 unsigned chunkIndex; 138 139 /// Whether there are non-trivial modifications to the decl spec. 140 bool trivial; 141 142 /// Whether we saved the attributes in the decl spec. 143 bool hasSavedAttrs; 144 145 /// The original set of attributes on the DeclSpec. 146 SmallVector<AttributeList*, 2> savedAttrs; 147 148 /// A list of attributes to diagnose the uselessness of when the 149 /// processing is complete. 150 SmallVector<AttributeList*, 2> ignoredTypeAttrs; 151 152 public: 153 TypeProcessingState(Sema &sema, Declarator &declarator) 154 : sema(sema), declarator(declarator), 155 chunkIndex(declarator.getNumTypeObjects()), 156 trivial(true), hasSavedAttrs(false) {} 157 158 Sema &getSema() const { 159 return sema; 160 } 161 162 Declarator &getDeclarator() const { 163 return declarator; 164 } 165 166 bool isProcessingDeclSpec() const { 167 return chunkIndex == declarator.getNumTypeObjects(); 168 } 169 170 unsigned getCurrentChunkIndex() const { 171 return chunkIndex; 172 } 173 174 void setCurrentChunkIndex(unsigned idx) { 175 assert(idx <= declarator.getNumTypeObjects()); 176 chunkIndex = idx; 177 } 178 179 AttributeList *&getCurrentAttrListRef() const { 180 if (isProcessingDeclSpec()) 181 return getMutableDeclSpec().getAttributes().getListRef(); 182 return declarator.getTypeObject(chunkIndex).getAttrListRef(); 183 } 184 185 /// Save the current set of attributes on the DeclSpec. 186 void saveDeclSpecAttrs() { 187 // Don't try to save them multiple times. 188 if (hasSavedAttrs) return; 189 190 DeclSpec &spec = getMutableDeclSpec(); 191 for (AttributeList *attr = spec.getAttributes().getList(); attr; 192 attr = attr->getNext()) 193 savedAttrs.push_back(attr); 194 trivial &= savedAttrs.empty(); 195 hasSavedAttrs = true; 196 } 197 198 /// Record that we had nowhere to put the given type attribute. 199 /// We will diagnose such attributes later. 200 void addIgnoredTypeAttr(AttributeList &attr) { 201 ignoredTypeAttrs.push_back(&attr); 202 } 203 204 /// Diagnose all the ignored type attributes, given that the 205 /// declarator worked out to the given type. 206 void diagnoseIgnoredTypeAttrs(QualType type) const { 207 for (SmallVectorImpl<AttributeList*>::const_iterator 208 i = ignoredTypeAttrs.begin(), e = ignoredTypeAttrs.end(); 209 i != e; ++i) 210 diagnoseBadTypeAttribute(getSema(), **i, type); 211 } 212 213 ~TypeProcessingState() { 214 if (trivial) return; 215 216 restoreDeclSpecAttrs(); 217 } 218 219 private: 220 DeclSpec &getMutableDeclSpec() const { 221 return const_cast<DeclSpec&>(declarator.getDeclSpec()); 222 } 223 224 void restoreDeclSpecAttrs() { 225 assert(hasSavedAttrs); 226 227 if (savedAttrs.empty()) { 228 getMutableDeclSpec().getAttributes().set(0); 229 return; 230 } 231 232 getMutableDeclSpec().getAttributes().set(savedAttrs[0]); 233 for (unsigned i = 0, e = savedAttrs.size() - 1; i != e; ++i) 234 savedAttrs[i]->setNext(savedAttrs[i+1]); 235 savedAttrs.back()->setNext(0); 236 } 237 }; 238 239 /// Basically std::pair except that we really want to avoid an 240 /// implicit operator= for safety concerns. It's also a minor 241 /// link-time optimization for this to be a private type. 242 struct AttrAndList { 243 /// The attribute. 244 AttributeList &first; 245 246 /// The head of the list the attribute is currently in. 247 AttributeList *&second; 248 249 AttrAndList(AttributeList &attr, AttributeList *&head) 250 : first(attr), second(head) {} 251 }; 252} 253 254namespace llvm { 255 template <> struct isPodLike<AttrAndList> { 256 static const bool value = true; 257 }; 258} 259 260static void spliceAttrIntoList(AttributeList &attr, AttributeList *&head) { 261 attr.setNext(head); 262 head = &attr; 263} 264 265static void spliceAttrOutOfList(AttributeList &attr, AttributeList *&head) { 266 if (head == &attr) { 267 head = attr.getNext(); 268 return; 269 } 270 271 AttributeList *cur = head; 272 while (true) { 273 assert(cur && cur->getNext() && "ran out of attrs?"); 274 if (cur->getNext() == &attr) { 275 cur->setNext(attr.getNext()); 276 return; 277 } 278 cur = cur->getNext(); 279 } 280} 281 282static void moveAttrFromListToList(AttributeList &attr, 283 AttributeList *&fromList, 284 AttributeList *&toList) { 285 spliceAttrOutOfList(attr, fromList); 286 spliceAttrIntoList(attr, toList); 287} 288 289/// The location of a type attribute. 290enum TypeAttrLocation { 291 /// The attribute is in the decl-specifier-seq. 292 TAL_DeclSpec, 293 /// The attribute is part of a DeclaratorChunk. 294 TAL_DeclChunk, 295 /// The attribute is immediately after the declaration's name. 296 TAL_DeclName 297}; 298 299static void processTypeAttrs(TypeProcessingState &state, 300 QualType &type, TypeAttrLocation TAL, 301 AttributeList *attrs); 302 303static bool handleFunctionTypeAttr(TypeProcessingState &state, 304 AttributeList &attr, 305 QualType &type); 306 307static bool handleMSPointerTypeQualifierAttr(TypeProcessingState &state, 308 AttributeList &attr, 309 QualType &type); 310 311static bool handleObjCGCTypeAttr(TypeProcessingState &state, 312 AttributeList &attr, QualType &type); 313 314static bool handleObjCOwnershipTypeAttr(TypeProcessingState &state, 315 AttributeList &attr, QualType &type); 316 317static bool handleObjCPointerTypeAttr(TypeProcessingState &state, 318 AttributeList &attr, QualType &type) { 319 if (attr.getKind() == AttributeList::AT_ObjCGC) 320 return handleObjCGCTypeAttr(state, attr, type); 321 assert(attr.getKind() == AttributeList::AT_ObjCOwnership); 322 return handleObjCOwnershipTypeAttr(state, attr, type); 323} 324 325/// Given the index of a declarator chunk, check whether that chunk 326/// directly specifies the return type of a function and, if so, find 327/// an appropriate place for it. 328/// 329/// \param i - a notional index which the search will start 330/// immediately inside 331static DeclaratorChunk *maybeMovePastReturnType(Declarator &declarator, 332 unsigned i) { 333 assert(i <= declarator.getNumTypeObjects()); 334 335 DeclaratorChunk *result = 0; 336 337 // First, look inwards past parens for a function declarator. 338 for (; i != 0; --i) { 339 DeclaratorChunk &fnChunk = declarator.getTypeObject(i-1); 340 switch (fnChunk.Kind) { 341 case DeclaratorChunk::Paren: 342 continue; 343 344 // If we find anything except a function, bail out. 345 case DeclaratorChunk::Pointer: 346 case DeclaratorChunk::BlockPointer: 347 case DeclaratorChunk::Array: 348 case DeclaratorChunk::Reference: 349 case DeclaratorChunk::MemberPointer: 350 return result; 351 352 // If we do find a function declarator, scan inwards from that, 353 // looking for a block-pointer declarator. 354 case DeclaratorChunk::Function: 355 for (--i; i != 0; --i) { 356 DeclaratorChunk &blockChunk = declarator.getTypeObject(i-1); 357 switch (blockChunk.Kind) { 358 case DeclaratorChunk::Paren: 359 case DeclaratorChunk::Pointer: 360 case DeclaratorChunk::Array: 361 case DeclaratorChunk::Function: 362 case DeclaratorChunk::Reference: 363 case DeclaratorChunk::MemberPointer: 364 continue; 365 case DeclaratorChunk::BlockPointer: 366 result = &blockChunk; 367 goto continue_outer; 368 } 369 llvm_unreachable("bad declarator chunk kind"); 370 } 371 372 // If we run out of declarators doing that, we're done. 373 return result; 374 } 375 llvm_unreachable("bad declarator chunk kind"); 376 377 // Okay, reconsider from our new point. 378 continue_outer: ; 379 } 380 381 // Ran out of chunks, bail out. 382 return result; 383} 384 385/// Given that an objc_gc attribute was written somewhere on a 386/// declaration *other* than on the declarator itself (for which, use 387/// distributeObjCPointerTypeAttrFromDeclarator), and given that it 388/// didn't apply in whatever position it was written in, try to move 389/// it to a more appropriate position. 390static void distributeObjCPointerTypeAttr(TypeProcessingState &state, 391 AttributeList &attr, 392 QualType type) { 393 Declarator &declarator = state.getDeclarator(); 394 395 // Move it to the outermost normal or block pointer declarator. 396 for (unsigned i = state.getCurrentChunkIndex(); i != 0; --i) { 397 DeclaratorChunk &chunk = declarator.getTypeObject(i-1); 398 switch (chunk.Kind) { 399 case DeclaratorChunk::Pointer: 400 case DeclaratorChunk::BlockPointer: { 401 // But don't move an ARC ownership attribute to the return type 402 // of a block. 403 DeclaratorChunk *destChunk = 0; 404 if (state.isProcessingDeclSpec() && 405 attr.getKind() == AttributeList::AT_ObjCOwnership) 406 destChunk = maybeMovePastReturnType(declarator, i - 1); 407 if (!destChunk) destChunk = &chunk; 408 409 moveAttrFromListToList(attr, state.getCurrentAttrListRef(), 410 destChunk->getAttrListRef()); 411 return; 412 } 413 414 case DeclaratorChunk::Paren: 415 case DeclaratorChunk::Array: 416 continue; 417 418 // We may be starting at the return type of a block. 419 case DeclaratorChunk::Function: 420 if (state.isProcessingDeclSpec() && 421 attr.getKind() == AttributeList::AT_ObjCOwnership) { 422 if (DeclaratorChunk *dest = maybeMovePastReturnType(declarator, i)) { 423 moveAttrFromListToList(attr, state.getCurrentAttrListRef(), 424 dest->getAttrListRef()); 425 return; 426 } 427 } 428 goto error; 429 430 // Don't walk through these. 431 case DeclaratorChunk::Reference: 432 case DeclaratorChunk::MemberPointer: 433 goto error; 434 } 435 } 436 error: 437 438 diagnoseBadTypeAttribute(state.getSema(), attr, type); 439} 440 441/// Distribute an objc_gc type attribute that was written on the 442/// declarator. 443static void 444distributeObjCPointerTypeAttrFromDeclarator(TypeProcessingState &state, 445 AttributeList &attr, 446 QualType &declSpecType) { 447 Declarator &declarator = state.getDeclarator(); 448 449 // objc_gc goes on the innermost pointer to something that's not a 450 // pointer. 451 unsigned innermost = -1U; 452 bool considerDeclSpec = true; 453 for (unsigned i = 0, e = declarator.getNumTypeObjects(); i != e; ++i) { 454 DeclaratorChunk &chunk = declarator.getTypeObject(i); 455 switch (chunk.Kind) { 456 case DeclaratorChunk::Pointer: 457 case DeclaratorChunk::BlockPointer: 458 innermost = i; 459 continue; 460 461 case DeclaratorChunk::Reference: 462 case DeclaratorChunk::MemberPointer: 463 case DeclaratorChunk::Paren: 464 case DeclaratorChunk::Array: 465 continue; 466 467 case DeclaratorChunk::Function: 468 considerDeclSpec = false; 469 goto done; 470 } 471 } 472 done: 473 474 // That might actually be the decl spec if we weren't blocked by 475 // anything in the declarator. 476 if (considerDeclSpec) { 477 if (handleObjCPointerTypeAttr(state, attr, declSpecType)) { 478 // Splice the attribute into the decl spec. Prevents the 479 // attribute from being applied multiple times and gives 480 // the source-location-filler something to work with. 481 state.saveDeclSpecAttrs(); 482 moveAttrFromListToList(attr, declarator.getAttrListRef(), 483 declarator.getMutableDeclSpec().getAttributes().getListRef()); 484 return; 485 } 486 } 487 488 // Otherwise, if we found an appropriate chunk, splice the attribute 489 // into it. 490 if (innermost != -1U) { 491 moveAttrFromListToList(attr, declarator.getAttrListRef(), 492 declarator.getTypeObject(innermost).getAttrListRef()); 493 return; 494 } 495 496 // Otherwise, diagnose when we're done building the type. 497 spliceAttrOutOfList(attr, declarator.getAttrListRef()); 498 state.addIgnoredTypeAttr(attr); 499} 500 501/// A function type attribute was written somewhere in a declaration 502/// *other* than on the declarator itself or in the decl spec. Given 503/// that it didn't apply in whatever position it was written in, try 504/// to move it to a more appropriate position. 505static void distributeFunctionTypeAttr(TypeProcessingState &state, 506 AttributeList &attr, 507 QualType type) { 508 Declarator &declarator = state.getDeclarator(); 509 510 // Try to push the attribute from the return type of a function to 511 // the function itself. 512 for (unsigned i = state.getCurrentChunkIndex(); i != 0; --i) { 513 DeclaratorChunk &chunk = declarator.getTypeObject(i-1); 514 switch (chunk.Kind) { 515 case DeclaratorChunk::Function: 516 moveAttrFromListToList(attr, state.getCurrentAttrListRef(), 517 chunk.getAttrListRef()); 518 return; 519 520 case DeclaratorChunk::Paren: 521 case DeclaratorChunk::Pointer: 522 case DeclaratorChunk::BlockPointer: 523 case DeclaratorChunk::Array: 524 case DeclaratorChunk::Reference: 525 case DeclaratorChunk::MemberPointer: 526 continue; 527 } 528 } 529 530 diagnoseBadTypeAttribute(state.getSema(), attr, type); 531} 532 533/// Try to distribute a function type attribute to the innermost 534/// function chunk or type. Returns true if the attribute was 535/// distributed, false if no location was found. 536static bool 537distributeFunctionTypeAttrToInnermost(TypeProcessingState &state, 538 AttributeList &attr, 539 AttributeList *&attrList, 540 QualType &declSpecType) { 541 Declarator &declarator = state.getDeclarator(); 542 543 // Put it on the innermost function chunk, if there is one. 544 for (unsigned i = 0, e = declarator.getNumTypeObjects(); i != e; ++i) { 545 DeclaratorChunk &chunk = declarator.getTypeObject(i); 546 if (chunk.Kind != DeclaratorChunk::Function) continue; 547 548 moveAttrFromListToList(attr, attrList, chunk.getAttrListRef()); 549 return true; 550 } 551 552 return handleFunctionTypeAttr(state, attr, declSpecType); 553} 554 555/// A function type attribute was written in the decl spec. Try to 556/// apply it somewhere. 557static void 558distributeFunctionTypeAttrFromDeclSpec(TypeProcessingState &state, 559 AttributeList &attr, 560 QualType &declSpecType) { 561 state.saveDeclSpecAttrs(); 562 563 // C++11 attributes before the decl specifiers actually appertain to 564 // the declarators. Move them straight there. We don't support the 565 // 'put them wherever you like' semantics we allow for GNU attributes. 566 if (attr.isCXX11Attribute()) { 567 moveAttrFromListToList(attr, state.getCurrentAttrListRef(), 568 state.getDeclarator().getAttrListRef()); 569 return; 570 } 571 572 // Try to distribute to the innermost. 573 if (distributeFunctionTypeAttrToInnermost(state, attr, 574 state.getCurrentAttrListRef(), 575 declSpecType)) 576 return; 577 578 // If that failed, diagnose the bad attribute when the declarator is 579 // fully built. 580 state.addIgnoredTypeAttr(attr); 581} 582 583/// A function type attribute was written on the declarator. Try to 584/// apply it somewhere. 585static void 586distributeFunctionTypeAttrFromDeclarator(TypeProcessingState &state, 587 AttributeList &attr, 588 QualType &declSpecType) { 589 Declarator &declarator = state.getDeclarator(); 590 591 // Try to distribute to the innermost. 592 if (distributeFunctionTypeAttrToInnermost(state, attr, 593 declarator.getAttrListRef(), 594 declSpecType)) 595 return; 596 597 // If that failed, diagnose the bad attribute when the declarator is 598 // fully built. 599 spliceAttrOutOfList(attr, declarator.getAttrListRef()); 600 state.addIgnoredTypeAttr(attr); 601} 602 603/// \brief Given that there are attributes written on the declarator 604/// itself, try to distribute any type attributes to the appropriate 605/// declarator chunk. 606/// 607/// These are attributes like the following: 608/// int f ATTR; 609/// int (f ATTR)(); 610/// but not necessarily this: 611/// int f() ATTR; 612static void distributeTypeAttrsFromDeclarator(TypeProcessingState &state, 613 QualType &declSpecType) { 614 // Collect all the type attributes from the declarator itself. 615 assert(state.getDeclarator().getAttributes() && "declarator has no attrs!"); 616 AttributeList *attr = state.getDeclarator().getAttributes(); 617 AttributeList *next; 618 do { 619 next = attr->getNext(); 620 621 // Do not distribute C++11 attributes. They have strict rules for what 622 // they appertain to. 623 if (attr->isCXX11Attribute()) 624 continue; 625 626 switch (attr->getKind()) { 627 OBJC_POINTER_TYPE_ATTRS_CASELIST: 628 distributeObjCPointerTypeAttrFromDeclarator(state, *attr, declSpecType); 629 break; 630 631 case AttributeList::AT_NSReturnsRetained: 632 if (!state.getSema().getLangOpts().ObjCAutoRefCount) 633 break; 634 // fallthrough 635 636 FUNCTION_TYPE_ATTRS_CASELIST: 637 distributeFunctionTypeAttrFromDeclarator(state, *attr, declSpecType); 638 break; 639 640 MS_TYPE_ATTRS_CASELIST: 641 // Microsoft type attributes cannot go after the declarator-id. 642 continue; 643 644 default: 645 break; 646 } 647 } while ((attr = next)); 648} 649 650/// Add a synthetic '()' to a block-literal declarator if it is 651/// required, given the return type. 652static void maybeSynthesizeBlockSignature(TypeProcessingState &state, 653 QualType declSpecType) { 654 Declarator &declarator = state.getDeclarator(); 655 656 // First, check whether the declarator would produce a function, 657 // i.e. whether the innermost semantic chunk is a function. 658 if (declarator.isFunctionDeclarator()) { 659 // If so, make that declarator a prototyped declarator. 660 declarator.getFunctionTypeInfo().hasPrototype = true; 661 return; 662 } 663 664 // If there are any type objects, the type as written won't name a 665 // function, regardless of the decl spec type. This is because a 666 // block signature declarator is always an abstract-declarator, and 667 // abstract-declarators can't just be parentheses chunks. Therefore 668 // we need to build a function chunk unless there are no type 669 // objects and the decl spec type is a function. 670 if (!declarator.getNumTypeObjects() && declSpecType->isFunctionType()) 671 return; 672 673 // Note that there *are* cases with invalid declarators where 674 // declarators consist solely of parentheses. In general, these 675 // occur only in failed efforts to make function declarators, so 676 // faking up the function chunk is still the right thing to do. 677 678 // Otherwise, we need to fake up a function declarator. 679 SourceLocation loc = declarator.getLocStart(); 680 681 // ...and *prepend* it to the declarator. 682 SourceLocation NoLoc; 683 declarator.AddInnermostTypeInfo(DeclaratorChunk::getFunction( 684 /*HasProto=*/true, 685 /*IsAmbiguous=*/false, 686 /*LParenLoc=*/NoLoc, 687 /*ArgInfo=*/0, 688 /*NumArgs=*/0, 689 /*EllipsisLoc=*/NoLoc, 690 /*RParenLoc=*/NoLoc, 691 /*TypeQuals=*/0, 692 /*RefQualifierIsLvalueRef=*/true, 693 /*RefQualifierLoc=*/NoLoc, 694 /*ConstQualifierLoc=*/NoLoc, 695 /*VolatileQualifierLoc=*/NoLoc, 696 /*MutableLoc=*/NoLoc, 697 EST_None, 698 /*ESpecLoc=*/NoLoc, 699 /*Exceptions=*/0, 700 /*ExceptionRanges=*/0, 701 /*NumExceptions=*/0, 702 /*NoexceptExpr=*/0, 703 loc, loc, declarator)); 704 705 // For consistency, make sure the state still has us as processing 706 // the decl spec. 707 assert(state.getCurrentChunkIndex() == declarator.getNumTypeObjects() - 1); 708 state.setCurrentChunkIndex(declarator.getNumTypeObjects()); 709} 710 711/// \brief Convert the specified declspec to the appropriate type 712/// object. 713/// \param state Specifies the declarator containing the declaration specifier 714/// to be converted, along with other associated processing state. 715/// \returns The type described by the declaration specifiers. This function 716/// never returns null. 717static QualType ConvertDeclSpecToType(TypeProcessingState &state) { 718 // FIXME: Should move the logic from DeclSpec::Finish to here for validity 719 // checking. 720 721 Sema &S = state.getSema(); 722 Declarator &declarator = state.getDeclarator(); 723 const DeclSpec &DS = declarator.getDeclSpec(); 724 SourceLocation DeclLoc = declarator.getIdentifierLoc(); 725 if (DeclLoc.isInvalid()) 726 DeclLoc = DS.getLocStart(); 727 728 ASTContext &Context = S.Context; 729 730 QualType Result; 731 switch (DS.getTypeSpecType()) { 732 case DeclSpec::TST_void: 733 Result = Context.VoidTy; 734 break; 735 case DeclSpec::TST_char: 736 if (DS.getTypeSpecSign() == DeclSpec::TSS_unspecified) 737 Result = Context.CharTy; 738 else if (DS.getTypeSpecSign() == DeclSpec::TSS_signed) 739 Result = Context.SignedCharTy; 740 else { 741 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unsigned && 742 "Unknown TSS value"); 743 Result = Context.UnsignedCharTy; 744 } 745 break; 746 case DeclSpec::TST_wchar: 747 if (DS.getTypeSpecSign() == DeclSpec::TSS_unspecified) 748 Result = Context.WCharTy; 749 else if (DS.getTypeSpecSign() == DeclSpec::TSS_signed) { 750 S.Diag(DS.getTypeSpecSignLoc(), diag::ext_invalid_sign_spec) 751 << DS.getSpecifierName(DS.getTypeSpecType()); 752 Result = Context.getSignedWCharType(); 753 } else { 754 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unsigned && 755 "Unknown TSS value"); 756 S.Diag(DS.getTypeSpecSignLoc(), diag::ext_invalid_sign_spec) 757 << DS.getSpecifierName(DS.getTypeSpecType()); 758 Result = Context.getUnsignedWCharType(); 759 } 760 break; 761 case DeclSpec::TST_char16: 762 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unspecified && 763 "Unknown TSS value"); 764 Result = Context.Char16Ty; 765 break; 766 case DeclSpec::TST_char32: 767 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unspecified && 768 "Unknown TSS value"); 769 Result = Context.Char32Ty; 770 break; 771 case DeclSpec::TST_unspecified: 772 // "<proto1,proto2>" is an objc qualified ID with a missing id. 773 if (DeclSpec::ProtocolQualifierListTy PQ = DS.getProtocolQualifiers()) { 774 Result = Context.getObjCObjectType(Context.ObjCBuiltinIdTy, 775 (ObjCProtocolDecl*const*)PQ, 776 DS.getNumProtocolQualifiers()); 777 Result = Context.getObjCObjectPointerType(Result); 778 break; 779 } 780 781 // If this is a missing declspec in a block literal return context, then it 782 // is inferred from the return statements inside the block. 783 // The declspec is always missing in a lambda expr context; it is either 784 // specified with a trailing return type or inferred. 785 if (declarator.getContext() == Declarator::LambdaExprContext || 786 isOmittedBlockReturnType(declarator)) { 787 Result = Context.DependentTy; 788 break; 789 } 790 791 // Unspecified typespec defaults to int in C90. However, the C90 grammar 792 // [C90 6.5] only allows a decl-spec if there was *some* type-specifier, 793 // type-qualifier, or storage-class-specifier. If not, emit an extwarn. 794 // Note that the one exception to this is function definitions, which are 795 // allowed to be completely missing a declspec. This is handled in the 796 // parser already though by it pretending to have seen an 'int' in this 797 // case. 798 if (S.getLangOpts().ImplicitInt) { 799 // In C89 mode, we only warn if there is a completely missing declspec 800 // when one is not allowed. 801 if (DS.isEmpty()) { 802 S.Diag(DeclLoc, diag::ext_missing_declspec) 803 << DS.getSourceRange() 804 << FixItHint::CreateInsertion(DS.getLocStart(), "int"); 805 } 806 } else if (!DS.hasTypeSpecifier()) { 807 // C99 and C++ require a type specifier. For example, C99 6.7.2p2 says: 808 // "At least one type specifier shall be given in the declaration 809 // specifiers in each declaration, and in the specifier-qualifier list in 810 // each struct declaration and type name." 811 if (S.getLangOpts().CPlusPlus) { 812 S.Diag(DeclLoc, diag::err_missing_type_specifier) 813 << DS.getSourceRange(); 814 815 // When this occurs in C++ code, often something is very broken with the 816 // value being declared, poison it as invalid so we don't get chains of 817 // errors. 818 declarator.setInvalidType(true); 819 } else { 820 S.Diag(DeclLoc, diag::ext_missing_type_specifier) 821 << DS.getSourceRange(); 822 } 823 } 824 825 // FALL THROUGH. 826 case DeclSpec::TST_int: { 827 if (DS.getTypeSpecSign() != DeclSpec::TSS_unsigned) { 828 switch (DS.getTypeSpecWidth()) { 829 case DeclSpec::TSW_unspecified: Result = Context.IntTy; break; 830 case DeclSpec::TSW_short: Result = Context.ShortTy; break; 831 case DeclSpec::TSW_long: Result = Context.LongTy; break; 832 case DeclSpec::TSW_longlong: 833 Result = Context.LongLongTy; 834 835 // 'long long' is a C99 or C++11 feature. 836 if (!S.getLangOpts().C99) { 837 if (S.getLangOpts().CPlusPlus) 838 S.Diag(DS.getTypeSpecWidthLoc(), 839 S.getLangOpts().CPlusPlus11 ? 840 diag::warn_cxx98_compat_longlong : diag::ext_cxx11_longlong); 841 else 842 S.Diag(DS.getTypeSpecWidthLoc(), diag::ext_c99_longlong); 843 } 844 break; 845 } 846 } else { 847 switch (DS.getTypeSpecWidth()) { 848 case DeclSpec::TSW_unspecified: Result = Context.UnsignedIntTy; break; 849 case DeclSpec::TSW_short: Result = Context.UnsignedShortTy; break; 850 case DeclSpec::TSW_long: Result = Context.UnsignedLongTy; break; 851 case DeclSpec::TSW_longlong: 852 Result = Context.UnsignedLongLongTy; 853 854 // 'long long' is a C99 or C++11 feature. 855 if (!S.getLangOpts().C99) { 856 if (S.getLangOpts().CPlusPlus) 857 S.Diag(DS.getTypeSpecWidthLoc(), 858 S.getLangOpts().CPlusPlus11 ? 859 diag::warn_cxx98_compat_longlong : diag::ext_cxx11_longlong); 860 else 861 S.Diag(DS.getTypeSpecWidthLoc(), diag::ext_c99_longlong); 862 } 863 break; 864 } 865 } 866 break; 867 } 868 case DeclSpec::TST_int128: 869 if (!S.PP.getTargetInfo().hasInt128Type()) 870 S.Diag(DS.getTypeSpecTypeLoc(), diag::err_int128_unsupported); 871 if (DS.getTypeSpecSign() == DeclSpec::TSS_unsigned) 872 Result = Context.UnsignedInt128Ty; 873 else 874 Result = Context.Int128Ty; 875 break; 876 case DeclSpec::TST_half: Result = Context.HalfTy; break; 877 case DeclSpec::TST_float: Result = Context.FloatTy; break; 878 case DeclSpec::TST_double: 879 if (DS.getTypeSpecWidth() == DeclSpec::TSW_long) 880 Result = Context.LongDoubleTy; 881 else 882 Result = Context.DoubleTy; 883 884 if (S.getLangOpts().OpenCL && !S.getOpenCLOptions().cl_khr_fp64) { 885 S.Diag(DS.getTypeSpecTypeLoc(), diag::err_double_requires_fp64); 886 declarator.setInvalidType(true); 887 } 888 break; 889 case DeclSpec::TST_bool: Result = Context.BoolTy; break; // _Bool or bool 890 case DeclSpec::TST_decimal32: // _Decimal32 891 case DeclSpec::TST_decimal64: // _Decimal64 892 case DeclSpec::TST_decimal128: // _Decimal128 893 S.Diag(DS.getTypeSpecTypeLoc(), diag::err_decimal_unsupported); 894 Result = Context.IntTy; 895 declarator.setInvalidType(true); 896 break; 897 case DeclSpec::TST_class: 898 case DeclSpec::TST_enum: 899 case DeclSpec::TST_union: 900 case DeclSpec::TST_struct: 901 case DeclSpec::TST_interface: { 902 TypeDecl *D = dyn_cast_or_null<TypeDecl>(DS.getRepAsDecl()); 903 if (!D) { 904 // This can happen in C++ with ambiguous lookups. 905 Result = Context.IntTy; 906 declarator.setInvalidType(true); 907 break; 908 } 909 910 // If the type is deprecated or unavailable, diagnose it. 911 S.DiagnoseUseOfDecl(D, DS.getTypeSpecTypeNameLoc()); 912 913 assert(DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 && 914 DS.getTypeSpecSign() == 0 && "No qualifiers on tag names!"); 915 916 // TypeQuals handled by caller. 917 Result = Context.getTypeDeclType(D); 918 919 // In both C and C++, make an ElaboratedType. 920 ElaboratedTypeKeyword Keyword 921 = ElaboratedType::getKeywordForTypeSpec(DS.getTypeSpecType()); 922 Result = S.getElaboratedType(Keyword, DS.getTypeSpecScope(), Result); 923 break; 924 } 925 case DeclSpec::TST_typename: { 926 assert(DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 && 927 DS.getTypeSpecSign() == 0 && 928 "Can't handle qualifiers on typedef names yet!"); 929 Result = S.GetTypeFromParser(DS.getRepAsType()); 930 if (Result.isNull()) 931 declarator.setInvalidType(true); 932 else if (DeclSpec::ProtocolQualifierListTy PQ 933 = DS.getProtocolQualifiers()) { 934 if (const ObjCObjectType *ObjT = Result->getAs<ObjCObjectType>()) { 935 // Silently drop any existing protocol qualifiers. 936 // TODO: determine whether that's the right thing to do. 937 if (ObjT->getNumProtocols()) 938 Result = ObjT->getBaseType(); 939 940 if (DS.getNumProtocolQualifiers()) 941 Result = Context.getObjCObjectType(Result, 942 (ObjCProtocolDecl*const*) PQ, 943 DS.getNumProtocolQualifiers()); 944 } else if (Result->isObjCIdType()) { 945 // id<protocol-list> 946 Result = Context.getObjCObjectType(Context.ObjCBuiltinIdTy, 947 (ObjCProtocolDecl*const*) PQ, 948 DS.getNumProtocolQualifiers()); 949 Result = Context.getObjCObjectPointerType(Result); 950 } else if (Result->isObjCClassType()) { 951 // Class<protocol-list> 952 Result = Context.getObjCObjectType(Context.ObjCBuiltinClassTy, 953 (ObjCProtocolDecl*const*) PQ, 954 DS.getNumProtocolQualifiers()); 955 Result = Context.getObjCObjectPointerType(Result); 956 } else { 957 S.Diag(DeclLoc, diag::err_invalid_protocol_qualifiers) 958 << DS.getSourceRange(); 959 declarator.setInvalidType(true); 960 } 961 } 962 963 // TypeQuals handled by caller. 964 break; 965 } 966 case DeclSpec::TST_typeofType: 967 // FIXME: Preserve type source info. 968 Result = S.GetTypeFromParser(DS.getRepAsType()); 969 assert(!Result.isNull() && "Didn't get a type for typeof?"); 970 if (!Result->isDependentType()) 971 if (const TagType *TT = Result->getAs<TagType>()) 972 S.DiagnoseUseOfDecl(TT->getDecl(), DS.getTypeSpecTypeLoc()); 973 // TypeQuals handled by caller. 974 Result = Context.getTypeOfType(Result); 975 break; 976 case DeclSpec::TST_typeofExpr: { 977 Expr *E = DS.getRepAsExpr(); 978 assert(E && "Didn't get an expression for typeof?"); 979 // TypeQuals handled by caller. 980 Result = S.BuildTypeofExprType(E, DS.getTypeSpecTypeLoc()); 981 if (Result.isNull()) { 982 Result = Context.IntTy; 983 declarator.setInvalidType(true); 984 } 985 break; 986 } 987 case DeclSpec::TST_decltype: { 988 Expr *E = DS.getRepAsExpr(); 989 assert(E && "Didn't get an expression for decltype?"); 990 // TypeQuals handled by caller. 991 Result = S.BuildDecltypeType(E, DS.getTypeSpecTypeLoc()); 992 if (Result.isNull()) { 993 Result = Context.IntTy; 994 declarator.setInvalidType(true); 995 } 996 break; 997 } 998 case DeclSpec::TST_underlyingType: 999 Result = S.GetTypeFromParser(DS.getRepAsType()); 1000 assert(!Result.isNull() && "Didn't get a type for __underlying_type?"); 1001 Result = S.BuildUnaryTransformType(Result, 1002 UnaryTransformType::EnumUnderlyingType, 1003 DS.getTypeSpecTypeLoc()); 1004 if (Result.isNull()) { 1005 Result = Context.IntTy; 1006 declarator.setInvalidType(true); 1007 } 1008 break; 1009 1010 case DeclSpec::TST_auto: 1011 // TypeQuals handled by caller. 1012 Result = Context.getAutoType(QualType(), /*decltype(auto)*/false); 1013 break; 1014 1015 case DeclSpec::TST_decltype_auto: 1016 Result = Context.getAutoType(QualType(), /*decltype(auto)*/true); 1017 break; 1018 1019 case DeclSpec::TST_unknown_anytype: 1020 Result = Context.UnknownAnyTy; 1021 break; 1022 1023 case DeclSpec::TST_atomic: 1024 Result = S.GetTypeFromParser(DS.getRepAsType()); 1025 assert(!Result.isNull() && "Didn't get a type for _Atomic?"); 1026 Result = S.BuildAtomicType(Result, DS.getTypeSpecTypeLoc()); 1027 if (Result.isNull()) { 1028 Result = Context.IntTy; 1029 declarator.setInvalidType(true); 1030 } 1031 break; 1032 1033 case DeclSpec::TST_image1d_t: 1034 Result = Context.OCLImage1dTy; 1035 break; 1036 1037 case DeclSpec::TST_image1d_array_t: 1038 Result = Context.OCLImage1dArrayTy; 1039 break; 1040 1041 case DeclSpec::TST_image1d_buffer_t: 1042 Result = Context.OCLImage1dBufferTy; 1043 break; 1044 1045 case DeclSpec::TST_image2d_t: 1046 Result = Context.OCLImage2dTy; 1047 break; 1048 1049 case DeclSpec::TST_image2d_array_t: 1050 Result = Context.OCLImage2dArrayTy; 1051 break; 1052 1053 case DeclSpec::TST_image3d_t: 1054 Result = Context.OCLImage3dTy; 1055 break; 1056 1057 case DeclSpec::TST_sampler_t: 1058 Result = Context.OCLSamplerTy; 1059 break; 1060 1061 case DeclSpec::TST_event_t: 1062 Result = Context.OCLEventTy; 1063 break; 1064 1065 case DeclSpec::TST_error: 1066 Result = Context.IntTy; 1067 declarator.setInvalidType(true); 1068 break; 1069 } 1070 1071 // Handle complex types. 1072 if (DS.getTypeSpecComplex() == DeclSpec::TSC_complex) { 1073 if (S.getLangOpts().Freestanding) 1074 S.Diag(DS.getTypeSpecComplexLoc(), diag::ext_freestanding_complex); 1075 Result = Context.getComplexType(Result); 1076 } else if (DS.isTypeAltiVecVector()) { 1077 unsigned typeSize = static_cast<unsigned>(Context.getTypeSize(Result)); 1078 assert(typeSize > 0 && "type size for vector must be greater than 0 bits"); 1079 VectorType::VectorKind VecKind = VectorType::AltiVecVector; 1080 if (DS.isTypeAltiVecPixel()) 1081 VecKind = VectorType::AltiVecPixel; 1082 else if (DS.isTypeAltiVecBool()) 1083 VecKind = VectorType::AltiVecBool; 1084 Result = Context.getVectorType(Result, 128/typeSize, VecKind); 1085 } 1086 1087 // FIXME: Imaginary. 1088 if (DS.getTypeSpecComplex() == DeclSpec::TSC_imaginary) 1089 S.Diag(DS.getTypeSpecComplexLoc(), diag::err_imaginary_not_supported); 1090 1091 // Before we process any type attributes, synthesize a block literal 1092 // function declarator if necessary. 1093 if (declarator.getContext() == Declarator::BlockLiteralContext) 1094 maybeSynthesizeBlockSignature(state, Result); 1095 1096 // Apply any type attributes from the decl spec. This may cause the 1097 // list of type attributes to be temporarily saved while the type 1098 // attributes are pushed around. 1099 if (AttributeList *attrs = DS.getAttributes().getList()) 1100 processTypeAttrs(state, Result, TAL_DeclSpec, attrs); 1101 1102 // Apply const/volatile/restrict qualifiers to T. 1103 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 1104 1105 // Warn about CV qualifiers on functions: C99 6.7.3p8: "If the specification 1106 // of a function type includes any type qualifiers, the behavior is 1107 // undefined." 1108 if (Result->isFunctionType() && TypeQuals) { 1109 if (TypeQuals & DeclSpec::TQ_const) 1110 S.Diag(DS.getConstSpecLoc(), diag::warn_typecheck_function_qualifiers) 1111 << Result << DS.getSourceRange(); 1112 else if (TypeQuals & DeclSpec::TQ_volatile) 1113 S.Diag(DS.getVolatileSpecLoc(), diag::warn_typecheck_function_qualifiers) 1114 << Result << DS.getSourceRange(); 1115 else { 1116 assert((TypeQuals & (DeclSpec::TQ_restrict | DeclSpec::TQ_atomic)) && 1117 "Has CVRA quals but not C, V, R, or A?"); 1118 // No diagnostic; we'll diagnose 'restrict' or '_Atomic' applied to a 1119 // function type later, in BuildQualifiedType. 1120 } 1121 } 1122 1123 // C++ [dcl.ref]p1: 1124 // Cv-qualified references are ill-formed except when the 1125 // cv-qualifiers are introduced through the use of a typedef 1126 // (7.1.3) or of a template type argument (14.3), in which 1127 // case the cv-qualifiers are ignored. 1128 // FIXME: Shouldn't we be checking SCS_typedef here? 1129 if (DS.getTypeSpecType() == DeclSpec::TST_typename && 1130 TypeQuals && Result->isReferenceType()) { 1131 TypeQuals &= ~DeclSpec::TQ_const; 1132 TypeQuals &= ~DeclSpec::TQ_volatile; 1133 TypeQuals &= ~DeclSpec::TQ_atomic; 1134 } 1135 1136 // C90 6.5.3 constraints: "The same type qualifier shall not appear more 1137 // than once in the same specifier-list or qualifier-list, either directly 1138 // or via one or more typedefs." 1139 if (!S.getLangOpts().C99 && !S.getLangOpts().CPlusPlus 1140 && TypeQuals & Result.getCVRQualifiers()) { 1141 if (TypeQuals & DeclSpec::TQ_const && Result.isConstQualified()) { 1142 S.Diag(DS.getConstSpecLoc(), diag::ext_duplicate_declspec) 1143 << "const"; 1144 } 1145 1146 if (TypeQuals & DeclSpec::TQ_volatile && Result.isVolatileQualified()) { 1147 S.Diag(DS.getVolatileSpecLoc(), diag::ext_duplicate_declspec) 1148 << "volatile"; 1149 } 1150 1151 // C90 doesn't have restrict nor _Atomic, so it doesn't force us to 1152 // produce a warning in this case. 1153 } 1154 1155 QualType Qualified = S.BuildQualifiedType(Result, DeclLoc, TypeQuals, &DS); 1156 1157 // If adding qualifiers fails, just use the unqualified type. 1158 if (Qualified.isNull()) 1159 declarator.setInvalidType(true); 1160 else 1161 Result = Qualified; 1162 } 1163 1164 return Result; 1165} 1166 1167static std::string getPrintableNameForEntity(DeclarationName Entity) { 1168 if (Entity) 1169 return Entity.getAsString(); 1170 1171 return "type name"; 1172} 1173 1174QualType Sema::BuildQualifiedType(QualType T, SourceLocation Loc, 1175 Qualifiers Qs, const DeclSpec *DS) { 1176 // Enforce C99 6.7.3p2: "Types other than pointer types derived from 1177 // object or incomplete types shall not be restrict-qualified." 1178 if (Qs.hasRestrict()) { 1179 unsigned DiagID = 0; 1180 QualType ProblemTy; 1181 1182 if (T->isAnyPointerType() || T->isReferenceType() || 1183 T->isMemberPointerType()) { 1184 QualType EltTy; 1185 if (T->isObjCObjectPointerType()) 1186 EltTy = T; 1187 else if (const MemberPointerType *PTy = T->getAs<MemberPointerType>()) 1188 EltTy = PTy->getPointeeType(); 1189 else 1190 EltTy = T->getPointeeType(); 1191 1192 // If we have a pointer or reference, the pointee must have an object 1193 // incomplete type. 1194 if (!EltTy->isIncompleteOrObjectType()) { 1195 DiagID = diag::err_typecheck_invalid_restrict_invalid_pointee; 1196 ProblemTy = EltTy; 1197 } 1198 } else if (!T->isDependentType()) { 1199 DiagID = diag::err_typecheck_invalid_restrict_not_pointer; 1200 ProblemTy = T; 1201 } 1202 1203 if (DiagID) { 1204 Diag(DS ? DS->getRestrictSpecLoc() : Loc, DiagID) << ProblemTy; 1205 Qs.removeRestrict(); 1206 } 1207 } 1208 1209 return Context.getQualifiedType(T, Qs); 1210} 1211 1212QualType Sema::BuildQualifiedType(QualType T, SourceLocation Loc, 1213 unsigned CVRA, const DeclSpec *DS) { 1214 // Convert from DeclSpec::TQ to Qualifiers::TQ by just dropping TQ_atomic. 1215 unsigned CVR = CVRA & ~DeclSpec::TQ_atomic; 1216 1217 // C11 6.7.3/5: 1218 // If the same qualifier appears more than once in the same 1219 // specifier-qualifier-list, either directly or via one or more typedefs, 1220 // the behavior is the same as if it appeared only once. 1221 // 1222 // It's not specified what happens when the _Atomic qualifier is applied to 1223 // a type specified with the _Atomic specifier, but we assume that this 1224 // should be treated as if the _Atomic qualifier appeared multiple times. 1225 if (CVRA & DeclSpec::TQ_atomic && !T->isAtomicType()) { 1226 // C11 6.7.3/5: 1227 // If other qualifiers appear along with the _Atomic qualifier in a 1228 // specifier-qualifier-list, the resulting type is the so-qualified 1229 // atomic type. 1230 // 1231 // Don't need to worry about array types here, since _Atomic can't be 1232 // applied to such types. 1233 SplitQualType Split = T.getSplitUnqualifiedType(); 1234 T = BuildAtomicType(QualType(Split.Ty, 0), 1235 DS ? DS->getAtomicSpecLoc() : Loc); 1236 if (T.isNull()) 1237 return T; 1238 Split.Quals.addCVRQualifiers(CVR); 1239 return BuildQualifiedType(T, Loc, Split.Quals); 1240 } 1241 1242 return BuildQualifiedType(T, Loc, Qualifiers::fromCVRMask(CVR), DS); 1243} 1244 1245/// \brief Build a paren type including \p T. 1246QualType Sema::BuildParenType(QualType T) { 1247 return Context.getParenType(T); 1248} 1249 1250/// Given that we're building a pointer or reference to the given 1251static QualType inferARCLifetimeForPointee(Sema &S, QualType type, 1252 SourceLocation loc, 1253 bool isReference) { 1254 // Bail out if retention is unrequired or already specified. 1255 if (!type->isObjCLifetimeType() || 1256 type.getObjCLifetime() != Qualifiers::OCL_None) 1257 return type; 1258 1259 Qualifiers::ObjCLifetime implicitLifetime = Qualifiers::OCL_None; 1260 1261 // If the object type is const-qualified, we can safely use 1262 // __unsafe_unretained. This is safe (because there are no read 1263 // barriers), and it'll be safe to coerce anything but __weak* to 1264 // the resulting type. 1265 if (type.isConstQualified()) { 1266 implicitLifetime = Qualifiers::OCL_ExplicitNone; 1267 1268 // Otherwise, check whether the static type does not require 1269 // retaining. This currently only triggers for Class (possibly 1270 // protocol-qualifed, and arrays thereof). 1271 } else if (type->isObjCARCImplicitlyUnretainedType()) { 1272 implicitLifetime = Qualifiers::OCL_ExplicitNone; 1273 1274 // If we are in an unevaluated context, like sizeof, skip adding a 1275 // qualification. 1276 } else if (S.isUnevaluatedContext()) { 1277 return type; 1278 1279 // If that failed, give an error and recover using __strong. __strong 1280 // is the option most likely to prevent spurious second-order diagnostics, 1281 // like when binding a reference to a field. 1282 } else { 1283 // These types can show up in private ivars in system headers, so 1284 // we need this to not be an error in those cases. Instead we 1285 // want to delay. 1286 if (S.DelayedDiagnostics.shouldDelayDiagnostics()) { 1287 S.DelayedDiagnostics.add( 1288 sema::DelayedDiagnostic::makeForbiddenType(loc, 1289 diag::err_arc_indirect_no_ownership, type, isReference)); 1290 } else { 1291 S.Diag(loc, diag::err_arc_indirect_no_ownership) << type << isReference; 1292 } 1293 implicitLifetime = Qualifiers::OCL_Strong; 1294 } 1295 assert(implicitLifetime && "didn't infer any lifetime!"); 1296 1297 Qualifiers qs; 1298 qs.addObjCLifetime(implicitLifetime); 1299 return S.Context.getQualifiedType(type, qs); 1300} 1301 1302/// \brief Build a pointer type. 1303/// 1304/// \param T The type to which we'll be building a pointer. 1305/// 1306/// \param Loc The location of the entity whose type involves this 1307/// pointer type or, if there is no such entity, the location of the 1308/// type that will have pointer type. 1309/// 1310/// \param Entity The name of the entity that involves the pointer 1311/// type, if known. 1312/// 1313/// \returns A suitable pointer type, if there are no 1314/// errors. Otherwise, returns a NULL type. 1315QualType Sema::BuildPointerType(QualType T, 1316 SourceLocation Loc, DeclarationName Entity) { 1317 if (T->isReferenceType()) { 1318 // C++ 8.3.2p4: There shall be no ... pointers to references ... 1319 Diag(Loc, diag::err_illegal_decl_pointer_to_reference) 1320 << getPrintableNameForEntity(Entity) << T; 1321 return QualType(); 1322 } 1323 1324 assert(!T->isObjCObjectType() && "Should build ObjCObjectPointerType"); 1325 1326 // In ARC, it is forbidden to build pointers to unqualified pointers. 1327 if (getLangOpts().ObjCAutoRefCount) 1328 T = inferARCLifetimeForPointee(*this, T, Loc, /*reference*/ false); 1329 1330 // Build the pointer type. 1331 return Context.getPointerType(T); 1332} 1333 1334/// \brief Build a reference type. 1335/// 1336/// \param T The type to which we'll be building a reference. 1337/// 1338/// \param Loc The location of the entity whose type involves this 1339/// reference type or, if there is no such entity, the location of the 1340/// type that will have reference type. 1341/// 1342/// \param Entity The name of the entity that involves the reference 1343/// type, if known. 1344/// 1345/// \returns A suitable reference type, if there are no 1346/// errors. Otherwise, returns a NULL type. 1347QualType Sema::BuildReferenceType(QualType T, bool SpelledAsLValue, 1348 SourceLocation Loc, 1349 DeclarationName Entity) { 1350 assert(Context.getCanonicalType(T) != Context.OverloadTy && 1351 "Unresolved overloaded function type"); 1352 1353 // C++0x [dcl.ref]p6: 1354 // If a typedef (7.1.3), a type template-parameter (14.3.1), or a 1355 // decltype-specifier (7.1.6.2) denotes a type TR that is a reference to a 1356 // type T, an attempt to create the type "lvalue reference to cv TR" creates 1357 // the type "lvalue reference to T", while an attempt to create the type 1358 // "rvalue reference to cv TR" creates the type TR. 1359 bool LValueRef = SpelledAsLValue || T->getAs<LValueReferenceType>(); 1360 1361 // C++ [dcl.ref]p4: There shall be no references to references. 1362 // 1363 // According to C++ DR 106, references to references are only 1364 // diagnosed when they are written directly (e.g., "int & &"), 1365 // but not when they happen via a typedef: 1366 // 1367 // typedef int& intref; 1368 // typedef intref& intref2; 1369 // 1370 // Parser::ParseDeclaratorInternal diagnoses the case where 1371 // references are written directly; here, we handle the 1372 // collapsing of references-to-references as described in C++0x. 1373 // DR 106 and 540 introduce reference-collapsing into C++98/03. 1374 1375 // C++ [dcl.ref]p1: 1376 // A declarator that specifies the type "reference to cv void" 1377 // is ill-formed. 1378 if (T->isVoidType()) { 1379 Diag(Loc, diag::err_reference_to_void); 1380 return QualType(); 1381 } 1382 1383 // In ARC, it is forbidden to build references to unqualified pointers. 1384 if (getLangOpts().ObjCAutoRefCount) 1385 T = inferARCLifetimeForPointee(*this, T, Loc, /*reference*/ true); 1386 1387 // Handle restrict on references. 1388 if (LValueRef) 1389 return Context.getLValueReferenceType(T, SpelledAsLValue); 1390 return Context.getRValueReferenceType(T); 1391} 1392 1393/// Check whether the specified array size makes the array type a VLA. If so, 1394/// return true, if not, return the size of the array in SizeVal. 1395static bool isArraySizeVLA(Sema &S, Expr *ArraySize, llvm::APSInt &SizeVal) { 1396 // If the size is an ICE, it certainly isn't a VLA. If we're in a GNU mode 1397 // (like gnu99, but not c99) accept any evaluatable value as an extension. 1398 class VLADiagnoser : public Sema::VerifyICEDiagnoser { 1399 public: 1400 VLADiagnoser() : Sema::VerifyICEDiagnoser(true) {} 1401 1402 virtual void diagnoseNotICE(Sema &S, SourceLocation Loc, SourceRange SR) { 1403 } 1404 1405 virtual void diagnoseFold(Sema &S, SourceLocation Loc, SourceRange SR) { 1406 S.Diag(Loc, diag::ext_vla_folded_to_constant) << SR; 1407 } 1408 } Diagnoser; 1409 1410 return S.VerifyIntegerConstantExpression(ArraySize, &SizeVal, Diagnoser, 1411 S.LangOpts.GNUMode).isInvalid(); 1412} 1413 1414 1415/// \brief Build an array type. 1416/// 1417/// \param T The type of each element in the array. 1418/// 1419/// \param ASM C99 array size modifier (e.g., '*', 'static'). 1420/// 1421/// \param ArraySize Expression describing the size of the array. 1422/// 1423/// \param Brackets The range from the opening '[' to the closing ']'. 1424/// 1425/// \param Entity The name of the entity that involves the array 1426/// type, if known. 1427/// 1428/// \returns A suitable array type, if there are no errors. Otherwise, 1429/// returns a NULL type. 1430QualType Sema::BuildArrayType(QualType T, ArrayType::ArraySizeModifier ASM, 1431 Expr *ArraySize, unsigned Quals, 1432 SourceRange Brackets, DeclarationName Entity) { 1433 1434 SourceLocation Loc = Brackets.getBegin(); 1435 if (getLangOpts().CPlusPlus) { 1436 // C++ [dcl.array]p1: 1437 // T is called the array element type; this type shall not be a reference 1438 // type, the (possibly cv-qualified) type void, a function type or an 1439 // abstract class type. 1440 // 1441 // C++ [dcl.array]p3: 1442 // When several "array of" specifications are adjacent, [...] only the 1443 // first of the constant expressions that specify the bounds of the arrays 1444 // may be omitted. 1445 // 1446 // Note: function types are handled in the common path with C. 1447 if (T->isReferenceType()) { 1448 Diag(Loc, diag::err_illegal_decl_array_of_references) 1449 << getPrintableNameForEntity(Entity) << T; 1450 return QualType(); 1451 } 1452 1453 if (T->isVoidType() || T->isIncompleteArrayType()) { 1454 Diag(Loc, diag::err_illegal_decl_array_incomplete_type) << T; 1455 return QualType(); 1456 } 1457 1458 if (RequireNonAbstractType(Brackets.getBegin(), T, 1459 diag::err_array_of_abstract_type)) 1460 return QualType(); 1461 1462 } else { 1463 // C99 6.7.5.2p1: If the element type is an incomplete or function type, 1464 // reject it (e.g. void ary[7], struct foo ary[7], void ary[7]()) 1465 if (RequireCompleteType(Loc, T, 1466 diag::err_illegal_decl_array_incomplete_type)) 1467 return QualType(); 1468 } 1469 1470 if (T->isFunctionType()) { 1471 Diag(Loc, diag::err_illegal_decl_array_of_functions) 1472 << getPrintableNameForEntity(Entity) << T; 1473 return QualType(); 1474 } 1475 1476 if (const RecordType *EltTy = T->getAs<RecordType>()) { 1477 // If the element type is a struct or union that contains a variadic 1478 // array, accept it as a GNU extension: C99 6.7.2.1p2. 1479 if (EltTy->getDecl()->hasFlexibleArrayMember()) 1480 Diag(Loc, diag::ext_flexible_array_in_array) << T; 1481 } else if (T->isObjCObjectType()) { 1482 Diag(Loc, diag::err_objc_array_of_interfaces) << T; 1483 return QualType(); 1484 } 1485 1486 // Do placeholder conversions on the array size expression. 1487 if (ArraySize && ArraySize->hasPlaceholderType()) { 1488 ExprResult Result = CheckPlaceholderExpr(ArraySize); 1489 if (Result.isInvalid()) return QualType(); 1490 ArraySize = Result.take(); 1491 } 1492 1493 // Do lvalue-to-rvalue conversions on the array size expression. 1494 if (ArraySize && !ArraySize->isRValue()) { 1495 ExprResult Result = DefaultLvalueConversion(ArraySize); 1496 if (Result.isInvalid()) 1497 return QualType(); 1498 1499 ArraySize = Result.take(); 1500 } 1501 1502 // C99 6.7.5.2p1: The size expression shall have integer type. 1503 // C++11 allows contextual conversions to such types. 1504 if (!getLangOpts().CPlusPlus11 && 1505 ArraySize && !ArraySize->isTypeDependent() && 1506 !ArraySize->getType()->isIntegralOrUnscopedEnumerationType()) { 1507 Diag(ArraySize->getLocStart(), diag::err_array_size_non_int) 1508 << ArraySize->getType() << ArraySize->getSourceRange(); 1509 return QualType(); 1510 } 1511 1512 llvm::APSInt ConstVal(Context.getTypeSize(Context.getSizeType())); 1513 if (!ArraySize) { 1514 if (ASM == ArrayType::Star) 1515 T = Context.getVariableArrayType(T, 0, ASM, Quals, Brackets); 1516 else 1517 T = Context.getIncompleteArrayType(T, ASM, Quals); 1518 } else if (ArraySize->isTypeDependent() || ArraySize->isValueDependent()) { 1519 T = Context.getDependentSizedArrayType(T, ArraySize, ASM, Quals, Brackets); 1520 } else if ((!T->isDependentType() && !T->isIncompleteType() && 1521 !T->isConstantSizeType()) || 1522 isArraySizeVLA(*this, ArraySize, ConstVal)) { 1523 // Even in C++11, don't allow contextual conversions in the array bound 1524 // of a VLA. 1525 if (getLangOpts().CPlusPlus11 && 1526 !ArraySize->getType()->isIntegralOrUnscopedEnumerationType()) { 1527 Diag(ArraySize->getLocStart(), diag::err_array_size_non_int) 1528 << ArraySize->getType() << ArraySize->getSourceRange(); 1529 return QualType(); 1530 } 1531 1532 // C99: an array with an element type that has a non-constant-size is a VLA. 1533 // C99: an array with a non-ICE size is a VLA. We accept any expression 1534 // that we can fold to a non-zero positive value as an extension. 1535 T = Context.getVariableArrayType(T, ArraySize, ASM, Quals, Brackets); 1536 } else { 1537 // C99 6.7.5.2p1: If the expression is a constant expression, it shall 1538 // have a value greater than zero. 1539 if (ConstVal.isSigned() && ConstVal.isNegative()) { 1540 if (Entity) 1541 Diag(ArraySize->getLocStart(), diag::err_decl_negative_array_size) 1542 << getPrintableNameForEntity(Entity) << ArraySize->getSourceRange(); 1543 else 1544 Diag(ArraySize->getLocStart(), diag::err_typecheck_negative_array_size) 1545 << ArraySize->getSourceRange(); 1546 return QualType(); 1547 } 1548 if (ConstVal == 0) { 1549 // GCC accepts zero sized static arrays. We allow them when 1550 // we're not in a SFINAE context. 1551 Diag(ArraySize->getLocStart(), 1552 isSFINAEContext()? diag::err_typecheck_zero_array_size 1553 : diag::ext_typecheck_zero_array_size) 1554 << ArraySize->getSourceRange(); 1555 1556 if (ASM == ArrayType::Static) { 1557 Diag(ArraySize->getLocStart(), 1558 diag::warn_typecheck_zero_static_array_size) 1559 << ArraySize->getSourceRange(); 1560 ASM = ArrayType::Normal; 1561 } 1562 } else if (!T->isDependentType() && !T->isVariablyModifiedType() && 1563 !T->isIncompleteType()) { 1564 // Is the array too large? 1565 unsigned ActiveSizeBits 1566 = ConstantArrayType::getNumAddressingBits(Context, T, ConstVal); 1567 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) { 1568 Diag(ArraySize->getLocStart(), diag::err_array_too_large) 1569 << ConstVal.toString(10) 1570 << ArraySize->getSourceRange(); 1571 return QualType(); 1572 } 1573 } 1574 1575 T = Context.getConstantArrayType(T, ConstVal, ASM, Quals); 1576 } 1577 1578 // OpenCL v1.2 s6.9.d: variable length arrays are not supported. 1579 if (getLangOpts().OpenCL && T->isVariableArrayType()) { 1580 Diag(Loc, diag::err_opencl_vla); 1581 return QualType(); 1582 } 1583 // If this is not C99, extwarn about VLA's and C99 array size modifiers. 1584 if (!getLangOpts().C99) { 1585 if (T->isVariableArrayType()) { 1586 // Prohibit the use of non-POD types in VLAs. 1587 // FIXME: C++1y allows this. 1588 QualType BaseT = Context.getBaseElementType(T); 1589 if (!T->isDependentType() && 1590 !BaseT.isPODType(Context) && 1591 !BaseT->isObjCLifetimeType()) { 1592 Diag(Loc, diag::err_vla_non_pod) 1593 << BaseT; 1594 return QualType(); 1595 } 1596 // Prohibit the use of VLAs during template argument deduction. 1597 else if (isSFINAEContext()) { 1598 Diag(Loc, diag::err_vla_in_sfinae); 1599 return QualType(); 1600 } 1601 // Just extwarn about VLAs. 1602 else 1603 Diag(Loc, getLangOpts().CPlusPlus1y 1604 ? diag::warn_cxx11_compat_array_of_runtime_bound 1605 : diag::ext_vla); 1606 } else if (ASM != ArrayType::Normal || Quals != 0) 1607 Diag(Loc, 1608 getLangOpts().CPlusPlus? diag::err_c99_array_usage_cxx 1609 : diag::ext_c99_array_usage) << ASM; 1610 } 1611 1612 if (T->isVariableArrayType()) { 1613 // Warn about VLAs for -Wvla. 1614 Diag(Loc, diag::warn_vla_used); 1615 } 1616 1617 return T; 1618} 1619 1620/// \brief Build an ext-vector type. 1621/// 1622/// Run the required checks for the extended vector type. 1623QualType Sema::BuildExtVectorType(QualType T, Expr *ArraySize, 1624 SourceLocation AttrLoc) { 1625 // unlike gcc's vector_size attribute, we do not allow vectors to be defined 1626 // in conjunction with complex types (pointers, arrays, functions, etc.). 1627 if (!T->isDependentType() && 1628 !T->isIntegerType() && !T->isRealFloatingType()) { 1629 Diag(AttrLoc, diag::err_attribute_invalid_vector_type) << T; 1630 return QualType(); 1631 } 1632 1633 if (!ArraySize->isTypeDependent() && !ArraySize->isValueDependent()) { 1634 llvm::APSInt vecSize(32); 1635 if (!ArraySize->isIntegerConstantExpr(vecSize, Context)) { 1636 Diag(AttrLoc, diag::err_attribute_argument_type) 1637 << "ext_vector_type" << AANT_ArgumentIntegerConstant 1638 << ArraySize->getSourceRange(); 1639 return QualType(); 1640 } 1641 1642 // unlike gcc's vector_size attribute, the size is specified as the 1643 // number of elements, not the number of bytes. 1644 unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue()); 1645 1646 if (vectorSize == 0) { 1647 Diag(AttrLoc, diag::err_attribute_zero_size) 1648 << ArraySize->getSourceRange(); 1649 return QualType(); 1650 } 1651 1652 if (VectorType::isVectorSizeTooLarge(vectorSize)) { 1653 Diag(AttrLoc, diag::err_attribute_size_too_large) 1654 << ArraySize->getSourceRange(); 1655 return QualType(); 1656 } 1657 1658 return Context.getExtVectorType(T, vectorSize); 1659 } 1660 1661 return Context.getDependentSizedExtVectorType(T, ArraySize, AttrLoc); 1662} 1663 1664bool Sema::CheckFunctionReturnType(QualType T, SourceLocation Loc) { 1665 if (T->isArrayType() || T->isFunctionType()) { 1666 Diag(Loc, diag::err_func_returning_array_function) 1667 << T->isFunctionType() << T; 1668 return true; 1669 } 1670 1671 // Functions cannot return half FP. 1672 if (T->isHalfType()) { 1673 Diag(Loc, diag::err_parameters_retval_cannot_have_fp16_type) << 1 << 1674 FixItHint::CreateInsertion(Loc, "*"); 1675 return true; 1676 } 1677 1678 // Methods cannot return interface types. All ObjC objects are 1679 // passed by reference. 1680 if (T->isObjCObjectType()) { 1681 Diag(Loc, diag::err_object_cannot_be_passed_returned_by_value) << 0 << T; 1682 return 0; 1683 } 1684 1685 return false; 1686} 1687 1688QualType Sema::BuildFunctionType(QualType T, 1689 llvm::MutableArrayRef<QualType> ParamTypes, 1690 SourceLocation Loc, DeclarationName Entity, 1691 const FunctionProtoType::ExtProtoInfo &EPI) { 1692 bool Invalid = false; 1693 1694 Invalid |= CheckFunctionReturnType(T, Loc); 1695 1696 for (unsigned Idx = 0, Cnt = ParamTypes.size(); Idx < Cnt; ++Idx) { 1697 // FIXME: Loc is too inprecise here, should use proper locations for args. 1698 QualType ParamType = Context.getAdjustedParameterType(ParamTypes[Idx]); 1699 if (ParamType->isVoidType()) { 1700 Diag(Loc, diag::err_param_with_void_type); 1701 Invalid = true; 1702 } else if (ParamType->isHalfType()) { 1703 // Disallow half FP arguments. 1704 Diag(Loc, diag::err_parameters_retval_cannot_have_fp16_type) << 0 << 1705 FixItHint::CreateInsertion(Loc, "*"); 1706 Invalid = true; 1707 } 1708 1709 ParamTypes[Idx] = ParamType; 1710 } 1711 1712 if (Invalid) 1713 return QualType(); 1714 1715 return Context.getFunctionType(T, ParamTypes, EPI); 1716} 1717 1718/// \brief Build a member pointer type \c T Class::*. 1719/// 1720/// \param T the type to which the member pointer refers. 1721/// \param Class the class type into which the member pointer points. 1722/// \param Loc the location where this type begins 1723/// \param Entity the name of the entity that will have this member pointer type 1724/// 1725/// \returns a member pointer type, if successful, or a NULL type if there was 1726/// an error. 1727QualType Sema::BuildMemberPointerType(QualType T, QualType Class, 1728 SourceLocation Loc, 1729 DeclarationName Entity) { 1730 // Verify that we're not building a pointer to pointer to function with 1731 // exception specification. 1732 if (CheckDistantExceptionSpec(T)) { 1733 Diag(Loc, diag::err_distant_exception_spec); 1734 1735 // FIXME: If we're doing this as part of template instantiation, 1736 // we should return immediately. 1737 1738 // Build the type anyway, but use the canonical type so that the 1739 // exception specifiers are stripped off. 1740 T = Context.getCanonicalType(T); 1741 } 1742 1743 // C++ 8.3.3p3: A pointer to member shall not point to ... a member 1744 // with reference type, or "cv void." 1745 if (T->isReferenceType()) { 1746 Diag(Loc, diag::err_illegal_decl_mempointer_to_reference) 1747 << (Entity? Entity.getAsString() : "type name") << T; 1748 return QualType(); 1749 } 1750 1751 if (T->isVoidType()) { 1752 Diag(Loc, diag::err_illegal_decl_mempointer_to_void) 1753 << (Entity? Entity.getAsString() : "type name"); 1754 return QualType(); 1755 } 1756 1757 if (!Class->isDependentType() && !Class->isRecordType()) { 1758 Diag(Loc, diag::err_mempointer_in_nonclass_type) << Class; 1759 return QualType(); 1760 } 1761 1762 // C++ allows the class type in a member pointer to be an incomplete type. 1763 // In the Microsoft ABI, the size of the member pointer can vary 1764 // according to the class type, which means that we really need a 1765 // complete type if possible, which means we need to instantiate templates. 1766 // 1767 // If template instantiation fails or the type is just incomplete, we have to 1768 // add an extra slot to the member pointer. Yes, this does cause problems 1769 // when passing pointers between TUs that disagree about the size. 1770 if (Context.getTargetInfo().getCXXABI().isMicrosoft()) { 1771 CXXRecordDecl *RD = Class->getAsCXXRecordDecl(); 1772 if (RD && !RD->hasAttr<MSInheritanceAttr>()) { 1773 // Lock in the inheritance model on the first use of a member pointer. 1774 // Otherwise we may disagree about the size at different points in the TU. 1775 // FIXME: MSVC picks a model on the first use that needs to know the size, 1776 // rather than on the first mention of the type, e.g. typedefs. 1777 if (RequireCompleteType(Loc, Class, 0) && !RD->isBeingDefined()) { 1778 // We know it doesn't have an attribute and it's incomplete, so use the 1779 // unspecified inheritance model. If we're in the record body, we can 1780 // figure out the inheritance model. 1781 for (CXXRecordDecl::redecl_iterator I = RD->redecls_begin(), 1782 E = RD->redecls_end(); I != E; ++I) { 1783 I->addAttr(::new (Context) UnspecifiedInheritanceAttr( 1784 RD->getSourceRange(), Context)); 1785 } 1786 } 1787 } 1788 } 1789 1790 // FIXME: Adjust member function pointer calling conventions. 1791 1792 return Context.getMemberPointerType(T, Class.getTypePtr()); 1793} 1794 1795/// \brief Build a block pointer type. 1796/// 1797/// \param T The type to which we'll be building a block pointer. 1798/// 1799/// \param Loc The source location, used for diagnostics. 1800/// 1801/// \param Entity The name of the entity that involves the block pointer 1802/// type, if known. 1803/// 1804/// \returns A suitable block pointer type, if there are no 1805/// errors. Otherwise, returns a NULL type. 1806QualType Sema::BuildBlockPointerType(QualType T, 1807 SourceLocation Loc, 1808 DeclarationName Entity) { 1809 if (!T->isFunctionType()) { 1810 Diag(Loc, diag::err_nonfunction_block_type); 1811 return QualType(); 1812 } 1813 1814 return Context.getBlockPointerType(T); 1815} 1816 1817QualType Sema::GetTypeFromParser(ParsedType Ty, TypeSourceInfo **TInfo) { 1818 QualType QT = Ty.get(); 1819 if (QT.isNull()) { 1820 if (TInfo) *TInfo = 0; 1821 return QualType(); 1822 } 1823 1824 TypeSourceInfo *DI = 0; 1825 if (const LocInfoType *LIT = dyn_cast<LocInfoType>(QT)) { 1826 QT = LIT->getType(); 1827 DI = LIT->getTypeSourceInfo(); 1828 } 1829 1830 if (TInfo) *TInfo = DI; 1831 return QT; 1832} 1833 1834static void transferARCOwnershipToDeclaratorChunk(TypeProcessingState &state, 1835 Qualifiers::ObjCLifetime ownership, 1836 unsigned chunkIndex); 1837 1838/// Given that this is the declaration of a parameter under ARC, 1839/// attempt to infer attributes and such for pointer-to-whatever 1840/// types. 1841static void inferARCWriteback(TypeProcessingState &state, 1842 QualType &declSpecType) { 1843 Sema &S = state.getSema(); 1844 Declarator &declarator = state.getDeclarator(); 1845 1846 // TODO: should we care about decl qualifiers? 1847 1848 // Check whether the declarator has the expected form. We walk 1849 // from the inside out in order to make the block logic work. 1850 unsigned outermostPointerIndex = 0; 1851 bool isBlockPointer = false; 1852 unsigned numPointers = 0; 1853 for (unsigned i = 0, e = declarator.getNumTypeObjects(); i != e; ++i) { 1854 unsigned chunkIndex = i; 1855 DeclaratorChunk &chunk = declarator.getTypeObject(chunkIndex); 1856 switch (chunk.Kind) { 1857 case DeclaratorChunk::Paren: 1858 // Ignore parens. 1859 break; 1860 1861 case DeclaratorChunk::Reference: 1862 case DeclaratorChunk::Pointer: 1863 // Count the number of pointers. Treat references 1864 // interchangeably as pointers; if they're mis-ordered, normal 1865 // type building will discover that. 1866 outermostPointerIndex = chunkIndex; 1867 numPointers++; 1868 break; 1869 1870 case DeclaratorChunk::BlockPointer: 1871 // If we have a pointer to block pointer, that's an acceptable 1872 // indirect reference; anything else is not an application of 1873 // the rules. 1874 if (numPointers != 1) return; 1875 numPointers++; 1876 outermostPointerIndex = chunkIndex; 1877 isBlockPointer = true; 1878 1879 // We don't care about pointer structure in return values here. 1880 goto done; 1881 1882 case DeclaratorChunk::Array: // suppress if written (id[])? 1883 case DeclaratorChunk::Function: 1884 case DeclaratorChunk::MemberPointer: 1885 return; 1886 } 1887 } 1888 done: 1889 1890 // If we have *one* pointer, then we want to throw the qualifier on 1891 // the declaration-specifiers, which means that it needs to be a 1892 // retainable object type. 1893 if (numPointers == 1) { 1894 // If it's not a retainable object type, the rule doesn't apply. 1895 if (!declSpecType->isObjCRetainableType()) return; 1896 1897 // If it already has lifetime, don't do anything. 1898 if (declSpecType.getObjCLifetime()) return; 1899 1900 // Otherwise, modify the type in-place. 1901 Qualifiers qs; 1902 1903 if (declSpecType->isObjCARCImplicitlyUnretainedType()) 1904 qs.addObjCLifetime(Qualifiers::OCL_ExplicitNone); 1905 else 1906 qs.addObjCLifetime(Qualifiers::OCL_Autoreleasing); 1907 declSpecType = S.Context.getQualifiedType(declSpecType, qs); 1908 1909 // If we have *two* pointers, then we want to throw the qualifier on 1910 // the outermost pointer. 1911 } else if (numPointers == 2) { 1912 // If we don't have a block pointer, we need to check whether the 1913 // declaration-specifiers gave us something that will turn into a 1914 // retainable object pointer after we slap the first pointer on it. 1915 if (!isBlockPointer && !declSpecType->isObjCObjectType()) 1916 return; 1917 1918 // Look for an explicit lifetime attribute there. 1919 DeclaratorChunk &chunk = declarator.getTypeObject(outermostPointerIndex); 1920 if (chunk.Kind != DeclaratorChunk::Pointer && 1921 chunk.Kind != DeclaratorChunk::BlockPointer) 1922 return; 1923 for (const AttributeList *attr = chunk.getAttrs(); attr; 1924 attr = attr->getNext()) 1925 if (attr->getKind() == AttributeList::AT_ObjCOwnership) 1926 return; 1927 1928 transferARCOwnershipToDeclaratorChunk(state, Qualifiers::OCL_Autoreleasing, 1929 outermostPointerIndex); 1930 1931 // Any other number of pointers/references does not trigger the rule. 1932 } else return; 1933 1934 // TODO: mark whether we did this inference? 1935} 1936 1937static void diagnoseIgnoredQualifiers( 1938 Sema &S, unsigned Quals, 1939 SourceLocation FallbackLoc, 1940 SourceLocation ConstQualLoc = SourceLocation(), 1941 SourceLocation VolatileQualLoc = SourceLocation(), 1942 SourceLocation RestrictQualLoc = SourceLocation(), 1943 SourceLocation AtomicQualLoc = SourceLocation()) { 1944 if (!Quals) 1945 return; 1946 1947 const SourceManager &SM = S.getSourceManager(); 1948 1949 struct Qual { 1950 unsigned Mask; 1951 const char *Name; 1952 SourceLocation Loc; 1953 } const QualKinds[4] = { 1954 { DeclSpec::TQ_const, "const", ConstQualLoc }, 1955 { DeclSpec::TQ_volatile, "volatile", VolatileQualLoc }, 1956 { DeclSpec::TQ_restrict, "restrict", RestrictQualLoc }, 1957 { DeclSpec::TQ_atomic, "_Atomic", AtomicQualLoc } 1958 }; 1959 1960 SmallString<32> QualStr; 1961 unsigned NumQuals = 0; 1962 SourceLocation Loc; 1963 FixItHint FixIts[4]; 1964 1965 // Build a string naming the redundant qualifiers. 1966 for (unsigned I = 0; I != 4; ++I) { 1967 if (Quals & QualKinds[I].Mask) { 1968 if (!QualStr.empty()) QualStr += ' '; 1969 QualStr += QualKinds[I].Name; 1970 1971 // If we have a location for the qualifier, offer a fixit. 1972 SourceLocation QualLoc = QualKinds[I].Loc; 1973 if (!QualLoc.isInvalid()) { 1974 FixIts[NumQuals] = FixItHint::CreateRemoval(QualLoc); 1975 if (Loc.isInvalid() || SM.isBeforeInTranslationUnit(QualLoc, Loc)) 1976 Loc = QualLoc; 1977 } 1978 1979 ++NumQuals; 1980 } 1981 } 1982 1983 S.Diag(Loc.isInvalid() ? FallbackLoc : Loc, diag::warn_qual_return_type) 1984 << QualStr << NumQuals << FixIts[0] << FixIts[1] << FixIts[2] << FixIts[3]; 1985} 1986 1987// Diagnose pointless type qualifiers on the return type of a function. 1988static void diagnoseIgnoredFunctionQualifiers(Sema &S, QualType RetTy, 1989 Declarator &D, 1990 unsigned FunctionChunkIndex) { 1991 if (D.getTypeObject(FunctionChunkIndex).Fun.hasTrailingReturnType()) { 1992 // FIXME: TypeSourceInfo doesn't preserve location information for 1993 // qualifiers. 1994 diagnoseIgnoredQualifiers(S, RetTy.getLocalCVRQualifiers(), 1995 D.getIdentifierLoc()); 1996 return; 1997 } 1998 1999 for (unsigned OuterChunkIndex = FunctionChunkIndex + 1, 2000 End = D.getNumTypeObjects(); 2001 OuterChunkIndex != End; ++OuterChunkIndex) { 2002 DeclaratorChunk &OuterChunk = D.getTypeObject(OuterChunkIndex); 2003 switch (OuterChunk.Kind) { 2004 case DeclaratorChunk::Paren: 2005 continue; 2006 2007 case DeclaratorChunk::Pointer: { 2008 DeclaratorChunk::PointerTypeInfo &PTI = OuterChunk.Ptr; 2009 diagnoseIgnoredQualifiers( 2010 S, PTI.TypeQuals, 2011 SourceLocation(), 2012 SourceLocation::getFromRawEncoding(PTI.ConstQualLoc), 2013 SourceLocation::getFromRawEncoding(PTI.VolatileQualLoc), 2014 SourceLocation::getFromRawEncoding(PTI.RestrictQualLoc), 2015 SourceLocation::getFromRawEncoding(PTI.AtomicQualLoc)); 2016 return; 2017 } 2018 2019 case DeclaratorChunk::Function: 2020 case DeclaratorChunk::BlockPointer: 2021 case DeclaratorChunk::Reference: 2022 case DeclaratorChunk::Array: 2023 case DeclaratorChunk::MemberPointer: 2024 // FIXME: We can't currently provide an accurate source location and a 2025 // fix-it hint for these. 2026 unsigned AtomicQual = RetTy->isAtomicType() ? DeclSpec::TQ_atomic : 0; 2027 diagnoseIgnoredQualifiers(S, RetTy.getCVRQualifiers() | AtomicQual, 2028 D.getIdentifierLoc()); 2029 return; 2030 } 2031 2032 llvm_unreachable("unknown declarator chunk kind"); 2033 } 2034 2035 // If the qualifiers come from a conversion function type, don't diagnose 2036 // them -- they're not necessarily redundant, since such a conversion 2037 // operator can be explicitly called as "x.operator const int()". 2038 if (D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) 2039 return; 2040 2041 // Just parens all the way out to the decl specifiers. Diagnose any qualifiers 2042 // which are present there. 2043 diagnoseIgnoredQualifiers(S, D.getDeclSpec().getTypeQualifiers(), 2044 D.getIdentifierLoc(), 2045 D.getDeclSpec().getConstSpecLoc(), 2046 D.getDeclSpec().getVolatileSpecLoc(), 2047 D.getDeclSpec().getRestrictSpecLoc(), 2048 D.getDeclSpec().getAtomicSpecLoc()); 2049} 2050 2051static QualType GetDeclSpecTypeForDeclarator(TypeProcessingState &state, 2052 TypeSourceInfo *&ReturnTypeInfo) { 2053 Sema &SemaRef = state.getSema(); 2054 Declarator &D = state.getDeclarator(); 2055 QualType T; 2056 ReturnTypeInfo = 0; 2057 2058 // The TagDecl owned by the DeclSpec. 2059 TagDecl *OwnedTagDecl = 0; 2060 2061 bool ContainsPlaceholderType = false; 2062 2063 switch (D.getName().getKind()) { 2064 case UnqualifiedId::IK_ImplicitSelfParam: 2065 case UnqualifiedId::IK_OperatorFunctionId: 2066 case UnqualifiedId::IK_Identifier: 2067 case UnqualifiedId::IK_LiteralOperatorId: 2068 case UnqualifiedId::IK_TemplateId: 2069 T = ConvertDeclSpecToType(state); 2070 ContainsPlaceholderType = D.getDeclSpec().containsPlaceholderType(); 2071 2072 if (!D.isInvalidType() && D.getDeclSpec().isTypeSpecOwned()) { 2073 OwnedTagDecl = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 2074 // Owned declaration is embedded in declarator. 2075 OwnedTagDecl->setEmbeddedInDeclarator(true); 2076 } 2077 break; 2078 2079 case UnqualifiedId::IK_ConstructorName: 2080 case UnqualifiedId::IK_ConstructorTemplateId: 2081 case UnqualifiedId::IK_DestructorName: 2082 // Constructors and destructors don't have return types. Use 2083 // "void" instead. 2084 T = SemaRef.Context.VoidTy; 2085 if (AttributeList *attrs = D.getDeclSpec().getAttributes().getList()) 2086 processTypeAttrs(state, T, TAL_DeclSpec, attrs); 2087 break; 2088 2089 case UnqualifiedId::IK_ConversionFunctionId: 2090 // The result type of a conversion function is the type that it 2091 // converts to. 2092 T = SemaRef.GetTypeFromParser(D.getName().ConversionFunctionId, 2093 &ReturnTypeInfo); 2094 ContainsPlaceholderType = T->getContainedAutoType(); 2095 break; 2096 } 2097 2098 if (D.getAttributes()) 2099 distributeTypeAttrsFromDeclarator(state, T); 2100 2101 // C++11 [dcl.spec.auto]p5: reject 'auto' if it is not in an allowed context. 2102 // In C++11, a function declarator using 'auto' must have a trailing return 2103 // type (this is checked later) and we can skip this. In other languages 2104 // using auto, we need to check regardless. 2105 if (ContainsPlaceholderType && 2106 (!SemaRef.getLangOpts().CPlusPlus11 || !D.isFunctionDeclarator())) { 2107 int Error = -1; 2108 2109 switch (D.getContext()) { 2110 case Declarator::KNRTypeListContext: 2111 llvm_unreachable("K&R type lists aren't allowed in C++"); 2112 case Declarator::LambdaExprContext: 2113 llvm_unreachable("Can't specify a type specifier in lambda grammar"); 2114 case Declarator::ObjCParameterContext: 2115 case Declarator::ObjCResultContext: 2116 case Declarator::PrototypeContext: 2117 Error = 0; // Function prototype 2118 break; 2119 case Declarator::MemberContext: 2120 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_static) 2121 break; 2122 switch (cast<TagDecl>(SemaRef.CurContext)->getTagKind()) { 2123 case TTK_Enum: llvm_unreachable("unhandled tag kind"); 2124 case TTK_Struct: Error = 1; /* Struct member */ break; 2125 case TTK_Union: Error = 2; /* Union member */ break; 2126 case TTK_Class: Error = 3; /* Class member */ break; 2127 case TTK_Interface: Error = 4; /* Interface member */ break; 2128 } 2129 break; 2130 case Declarator::CXXCatchContext: 2131 case Declarator::ObjCCatchContext: 2132 Error = 5; // Exception declaration 2133 break; 2134 case Declarator::TemplateParamContext: 2135 Error = 6; // Template parameter 2136 break; 2137 case Declarator::BlockLiteralContext: 2138 Error = 7; // Block literal 2139 break; 2140 case Declarator::TemplateTypeArgContext: 2141 Error = 8; // Template type argument 2142 break; 2143 case Declarator::AliasDeclContext: 2144 case Declarator::AliasTemplateContext: 2145 Error = 10; // Type alias 2146 break; 2147 case Declarator::TrailingReturnContext: 2148 if (!SemaRef.getLangOpts().CPlusPlus1y) 2149 Error = 11; // Function return type 2150 break; 2151 case Declarator::ConversionIdContext: 2152 if (!SemaRef.getLangOpts().CPlusPlus1y) 2153 Error = 12; // conversion-type-id 2154 break; 2155 case Declarator::TypeNameContext: 2156 Error = 13; // Generic 2157 break; 2158 case Declarator::FileContext: 2159 case Declarator::BlockContext: 2160 case Declarator::ForContext: 2161 case Declarator::ConditionContext: 2162 case Declarator::CXXNewContext: 2163 break; 2164 } 2165 2166 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 2167 Error = 9; 2168 2169 // In Objective-C it is an error to use 'auto' on a function declarator. 2170 if (D.isFunctionDeclarator()) 2171 Error = 11; 2172 2173 // C++11 [dcl.spec.auto]p2: 'auto' is always fine if the declarator 2174 // contains a trailing return type. That is only legal at the outermost 2175 // level. Check all declarator chunks (outermost first) anyway, to give 2176 // better diagnostics. 2177 if (SemaRef.getLangOpts().CPlusPlus11 && Error != -1) { 2178 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 2179 unsigned chunkIndex = e - i - 1; 2180 state.setCurrentChunkIndex(chunkIndex); 2181 DeclaratorChunk &DeclType = D.getTypeObject(chunkIndex); 2182 if (DeclType.Kind == DeclaratorChunk::Function) { 2183 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun; 2184 if (FTI.hasTrailingReturnType()) { 2185 Error = -1; 2186 break; 2187 } 2188 } 2189 } 2190 } 2191 2192 SourceRange AutoRange = D.getDeclSpec().getTypeSpecTypeLoc(); 2193 if (D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) 2194 AutoRange = D.getName().getSourceRange(); 2195 2196 if (Error != -1) { 2197 SemaRef.Diag(AutoRange.getBegin(), diag::err_auto_not_allowed) 2198 << Error << AutoRange; 2199 T = SemaRef.Context.IntTy; 2200 D.setInvalidType(true); 2201 } else 2202 SemaRef.Diag(AutoRange.getBegin(), 2203 diag::warn_cxx98_compat_auto_type_specifier) 2204 << AutoRange; 2205 } 2206 2207 if (SemaRef.getLangOpts().CPlusPlus && 2208 OwnedTagDecl && OwnedTagDecl->isCompleteDefinition()) { 2209 // Check the contexts where C++ forbids the declaration of a new class 2210 // or enumeration in a type-specifier-seq. 2211 switch (D.getContext()) { 2212 case Declarator::TrailingReturnContext: 2213 // Class and enumeration definitions are syntactically not allowed in 2214 // trailing return types. 2215 llvm_unreachable("parser should not have allowed this"); 2216 break; 2217 case Declarator::FileContext: 2218 case Declarator::MemberContext: 2219 case Declarator::BlockContext: 2220 case Declarator::ForContext: 2221 case Declarator::BlockLiteralContext: 2222 case Declarator::LambdaExprContext: 2223 // C++11 [dcl.type]p3: 2224 // A type-specifier-seq shall not define a class or enumeration unless 2225 // it appears in the type-id of an alias-declaration (7.1.3) that is not 2226 // the declaration of a template-declaration. 2227 case Declarator::AliasDeclContext: 2228 break; 2229 case Declarator::AliasTemplateContext: 2230 SemaRef.Diag(OwnedTagDecl->getLocation(), 2231 diag::err_type_defined_in_alias_template) 2232 << SemaRef.Context.getTypeDeclType(OwnedTagDecl); 2233 D.setInvalidType(true); 2234 break; 2235 case Declarator::TypeNameContext: 2236 case Declarator::ConversionIdContext: 2237 case Declarator::TemplateParamContext: 2238 case Declarator::CXXNewContext: 2239 case Declarator::CXXCatchContext: 2240 case Declarator::ObjCCatchContext: 2241 case Declarator::TemplateTypeArgContext: 2242 SemaRef.Diag(OwnedTagDecl->getLocation(), 2243 diag::err_type_defined_in_type_specifier) 2244 << SemaRef.Context.getTypeDeclType(OwnedTagDecl); 2245 D.setInvalidType(true); 2246 break; 2247 case Declarator::PrototypeContext: 2248 case Declarator::ObjCParameterContext: 2249 case Declarator::ObjCResultContext: 2250 case Declarator::KNRTypeListContext: 2251 // C++ [dcl.fct]p6: 2252 // Types shall not be defined in return or parameter types. 2253 SemaRef.Diag(OwnedTagDecl->getLocation(), 2254 diag::err_type_defined_in_param_type) 2255 << SemaRef.Context.getTypeDeclType(OwnedTagDecl); 2256 D.setInvalidType(true); 2257 break; 2258 case Declarator::ConditionContext: 2259 // C++ 6.4p2: 2260 // The type-specifier-seq shall not contain typedef and shall not declare 2261 // a new class or enumeration. 2262 SemaRef.Diag(OwnedTagDecl->getLocation(), 2263 diag::err_type_defined_in_condition); 2264 D.setInvalidType(true); 2265 break; 2266 } 2267 } 2268 2269 return T; 2270} 2271 2272static std::string getFunctionQualifiersAsString(const FunctionProtoType *FnTy){ 2273 std::string Quals = 2274 Qualifiers::fromCVRMask(FnTy->getTypeQuals()).getAsString(); 2275 2276 switch (FnTy->getRefQualifier()) { 2277 case RQ_None: 2278 break; 2279 2280 case RQ_LValue: 2281 if (!Quals.empty()) 2282 Quals += ' '; 2283 Quals += '&'; 2284 break; 2285 2286 case RQ_RValue: 2287 if (!Quals.empty()) 2288 Quals += ' '; 2289 Quals += "&&"; 2290 break; 2291 } 2292 2293 return Quals; 2294} 2295 2296/// Check that the function type T, which has a cv-qualifier or a ref-qualifier, 2297/// can be contained within the declarator chunk DeclType, and produce an 2298/// appropriate diagnostic if not. 2299static void checkQualifiedFunction(Sema &S, QualType T, 2300 DeclaratorChunk &DeclType) { 2301 // C++98 [dcl.fct]p4 / C++11 [dcl.fct]p6: a function type with a 2302 // cv-qualifier or a ref-qualifier can only appear at the topmost level 2303 // of a type. 2304 int DiagKind = -1; 2305 switch (DeclType.Kind) { 2306 case DeclaratorChunk::Paren: 2307 case DeclaratorChunk::MemberPointer: 2308 // These cases are permitted. 2309 return; 2310 case DeclaratorChunk::Array: 2311 case DeclaratorChunk::Function: 2312 // These cases don't allow function types at all; no need to diagnose the 2313 // qualifiers separately. 2314 return; 2315 case DeclaratorChunk::BlockPointer: 2316 DiagKind = 0; 2317 break; 2318 case DeclaratorChunk::Pointer: 2319 DiagKind = 1; 2320 break; 2321 case DeclaratorChunk::Reference: 2322 DiagKind = 2; 2323 break; 2324 } 2325 2326 assert(DiagKind != -1); 2327 S.Diag(DeclType.Loc, diag::err_compound_qualified_function_type) 2328 << DiagKind << isa<FunctionType>(T.IgnoreParens()) << T 2329 << getFunctionQualifiersAsString(T->castAs<FunctionProtoType>()); 2330} 2331 2332/// Produce an approprioate diagnostic for an ambiguity between a function 2333/// declarator and a C++ direct-initializer. 2334static void warnAboutAmbiguousFunction(Sema &S, Declarator &D, 2335 DeclaratorChunk &DeclType, QualType RT) { 2336 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun; 2337 assert(FTI.isAmbiguous && "no direct-initializer / function ambiguity"); 2338 2339 // If the return type is void there is no ambiguity. 2340 if (RT->isVoidType()) 2341 return; 2342 2343 // An initializer for a non-class type can have at most one argument. 2344 if (!RT->isRecordType() && FTI.NumArgs > 1) 2345 return; 2346 2347 // An initializer for a reference must have exactly one argument. 2348 if (RT->isReferenceType() && FTI.NumArgs != 1) 2349 return; 2350 2351 // Only warn if this declarator is declaring a function at block scope, and 2352 // doesn't have a storage class (such as 'extern') specified. 2353 if (!D.isFunctionDeclarator() || 2354 D.getFunctionDefinitionKind() != FDK_Declaration || 2355 !S.CurContext->isFunctionOrMethod() || 2356 D.getDeclSpec().getStorageClassSpec() 2357 != DeclSpec::SCS_unspecified) 2358 return; 2359 2360 // Inside a condition, a direct initializer is not permitted. We allow one to 2361 // be parsed in order to give better diagnostics in condition parsing. 2362 if (D.getContext() == Declarator::ConditionContext) 2363 return; 2364 2365 SourceRange ParenRange(DeclType.Loc, DeclType.EndLoc); 2366 2367 S.Diag(DeclType.Loc, 2368 FTI.NumArgs ? diag::warn_parens_disambiguated_as_function_declaration 2369 : diag::warn_empty_parens_are_function_decl) 2370 << ParenRange; 2371 2372 // If the declaration looks like: 2373 // T var1, 2374 // f(); 2375 // and name lookup finds a function named 'f', then the ',' was 2376 // probably intended to be a ';'. 2377 if (!D.isFirstDeclarator() && D.getIdentifier()) { 2378 FullSourceLoc Comma(D.getCommaLoc(), S.SourceMgr); 2379 FullSourceLoc Name(D.getIdentifierLoc(), S.SourceMgr); 2380 if (Comma.getFileID() != Name.getFileID() || 2381 Comma.getSpellingLineNumber() != Name.getSpellingLineNumber()) { 2382 LookupResult Result(S, D.getIdentifier(), SourceLocation(), 2383 Sema::LookupOrdinaryName); 2384 if (S.LookupName(Result, S.getCurScope())) 2385 S.Diag(D.getCommaLoc(), diag::note_empty_parens_function_call) 2386 << FixItHint::CreateReplacement(D.getCommaLoc(), ";") 2387 << D.getIdentifier(); 2388 } 2389 } 2390 2391 if (FTI.NumArgs > 0) { 2392 // For a declaration with parameters, eg. "T var(T());", suggest adding parens 2393 // around the first parameter to turn the declaration into a variable 2394 // declaration. 2395 SourceRange Range = FTI.ArgInfo[0].Param->getSourceRange(); 2396 SourceLocation B = Range.getBegin(); 2397 SourceLocation E = S.PP.getLocForEndOfToken(Range.getEnd()); 2398 // FIXME: Maybe we should suggest adding braces instead of parens 2399 // in C++11 for classes that don't have an initializer_list constructor. 2400 S.Diag(B, diag::note_additional_parens_for_variable_declaration) 2401 << FixItHint::CreateInsertion(B, "(") 2402 << FixItHint::CreateInsertion(E, ")"); 2403 } else { 2404 // For a declaration without parameters, eg. "T var();", suggest replacing the 2405 // parens with an initializer to turn the declaration into a variable 2406 // declaration. 2407 const CXXRecordDecl *RD = RT->getAsCXXRecordDecl(); 2408 2409 // Empty parens mean value-initialization, and no parens mean 2410 // default initialization. These are equivalent if the default 2411 // constructor is user-provided or if zero-initialization is a 2412 // no-op. 2413 if (RD && RD->hasDefinition() && 2414 (RD->isEmpty() || RD->hasUserProvidedDefaultConstructor())) 2415 S.Diag(DeclType.Loc, diag::note_empty_parens_default_ctor) 2416 << FixItHint::CreateRemoval(ParenRange); 2417 else { 2418 std::string Init = S.getFixItZeroInitializerForType(RT); 2419 if (Init.empty() && S.LangOpts.CPlusPlus11) 2420 Init = "{}"; 2421 if (!Init.empty()) 2422 S.Diag(DeclType.Loc, diag::note_empty_parens_zero_initialize) 2423 << FixItHint::CreateReplacement(ParenRange, Init); 2424 } 2425 } 2426} 2427 2428/// Helper for figuring out the default CC for a function declarator type. If 2429/// this is the outermost chunk, then we can determine the CC from the 2430/// declarator context. If not, then this could be either a member function 2431/// type or normal function type. 2432static CallingConv 2433getCCForDeclaratorChunk(Sema &S, Declarator &D, 2434 const DeclaratorChunk::FunctionTypeInfo &FTI, 2435 unsigned ChunkIndex) { 2436 assert(D.getTypeObject(ChunkIndex).Kind == DeclaratorChunk::Function); 2437 2438 bool IsCXXInstanceMethod = false; 2439 2440 if (S.getLangOpts().CPlusPlus) { 2441 // Look inwards through parentheses to see if this chunk will form a 2442 // member pointer type or if we're the declarator. Any type attributes 2443 // between here and there will override the CC we choose here. 2444 unsigned I = ChunkIndex; 2445 bool FoundNonParen = false; 2446 while (I && !FoundNonParen) { 2447 --I; 2448 if (D.getTypeObject(I).Kind != DeclaratorChunk::Paren) 2449 FoundNonParen = true; 2450 } 2451 2452 if (FoundNonParen) { 2453 // If we're not the declarator, we're a regular function type unless we're 2454 // in a member pointer. 2455 IsCXXInstanceMethod = 2456 D.getTypeObject(I).Kind == DeclaratorChunk::MemberPointer; 2457 } else { 2458 // We're the innermost decl chunk, so must be a function declarator. 2459 assert(D.isFunctionDeclarator()); 2460 2461 // If we're inside a record, we're declaring a method, but it could be 2462 // static. 2463 IsCXXInstanceMethod = 2464 (D.getContext() == Declarator::MemberContext && 2465 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 2466 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static && 2467 !D.getDeclSpec().isFriendSpecified()); 2468 } 2469 } 2470 2471 return S.Context.getDefaultCallingConvention(FTI.isVariadic, 2472 IsCXXInstanceMethod); 2473} 2474 2475static TypeSourceInfo *GetFullTypeForDeclarator(TypeProcessingState &state, 2476 QualType declSpecType, 2477 TypeSourceInfo *TInfo) { 2478 2479 QualType T = declSpecType; 2480 Declarator &D = state.getDeclarator(); 2481 Sema &S = state.getSema(); 2482 ASTContext &Context = S.Context; 2483 const LangOptions &LangOpts = S.getLangOpts(); 2484 2485 // The name we're declaring, if any. 2486 DeclarationName Name; 2487 if (D.getIdentifier()) 2488 Name = D.getIdentifier(); 2489 2490 // Does this declaration declare a typedef-name? 2491 bool IsTypedefName = 2492 D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef || 2493 D.getContext() == Declarator::AliasDeclContext || 2494 D.getContext() == Declarator::AliasTemplateContext; 2495 2496 // Does T refer to a function type with a cv-qualifier or a ref-qualifier? 2497 bool IsQualifiedFunction = T->isFunctionProtoType() && 2498 (T->castAs<FunctionProtoType>()->getTypeQuals() != 0 || 2499 T->castAs<FunctionProtoType>()->getRefQualifier() != RQ_None); 2500 2501 // If T is 'decltype(auto)', the only declarators we can have are parens 2502 // and at most one function declarator if this is a function declaration. 2503 if (const AutoType *AT = T->getAs<AutoType>()) { 2504 if (AT->isDecltypeAuto()) { 2505 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) { 2506 unsigned Index = E - I - 1; 2507 DeclaratorChunk &DeclChunk = D.getTypeObject(Index); 2508 unsigned DiagId = diag::err_decltype_auto_compound_type; 2509 unsigned DiagKind = 0; 2510 switch (DeclChunk.Kind) { 2511 case DeclaratorChunk::Paren: 2512 continue; 2513 case DeclaratorChunk::Function: { 2514 unsigned FnIndex; 2515 if (D.isFunctionDeclarationContext() && 2516 D.isFunctionDeclarator(FnIndex) && FnIndex == Index) 2517 continue; 2518 DiagId = diag::err_decltype_auto_function_declarator_not_declaration; 2519 break; 2520 } 2521 case DeclaratorChunk::Pointer: 2522 case DeclaratorChunk::BlockPointer: 2523 case DeclaratorChunk::MemberPointer: 2524 DiagKind = 0; 2525 break; 2526 case DeclaratorChunk::Reference: 2527 DiagKind = 1; 2528 break; 2529 case DeclaratorChunk::Array: 2530 DiagKind = 2; 2531 break; 2532 } 2533 2534 S.Diag(DeclChunk.Loc, DiagId) << DiagKind; 2535 D.setInvalidType(true); 2536 break; 2537 } 2538 } 2539 } 2540 2541 // Walk the DeclTypeInfo, building the recursive type as we go. 2542 // DeclTypeInfos are ordered from the identifier out, which is 2543 // opposite of what we want :). 2544 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 2545 unsigned chunkIndex = e - i - 1; 2546 state.setCurrentChunkIndex(chunkIndex); 2547 DeclaratorChunk &DeclType = D.getTypeObject(chunkIndex); 2548 if (IsQualifiedFunction) { 2549 checkQualifiedFunction(S, T, DeclType); 2550 IsQualifiedFunction = DeclType.Kind == DeclaratorChunk::Paren; 2551 } 2552 switch (DeclType.Kind) { 2553 case DeclaratorChunk::Paren: 2554 T = S.BuildParenType(T); 2555 break; 2556 case DeclaratorChunk::BlockPointer: 2557 // If blocks are disabled, emit an error. 2558 if (!LangOpts.Blocks) 2559 S.Diag(DeclType.Loc, diag::err_blocks_disable); 2560 2561 T = S.BuildBlockPointerType(T, D.getIdentifierLoc(), Name); 2562 if (DeclType.Cls.TypeQuals) 2563 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Cls.TypeQuals); 2564 break; 2565 case DeclaratorChunk::Pointer: 2566 // Verify that we're not building a pointer to pointer to function with 2567 // exception specification. 2568 if (LangOpts.CPlusPlus && S.CheckDistantExceptionSpec(T)) { 2569 S.Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 2570 D.setInvalidType(true); 2571 // Build the type anyway. 2572 } 2573 if (LangOpts.ObjC1 && T->getAs<ObjCObjectType>()) { 2574 T = Context.getObjCObjectPointerType(T); 2575 if (DeclType.Ptr.TypeQuals) 2576 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Ptr.TypeQuals); 2577 break; 2578 } 2579 T = S.BuildPointerType(T, DeclType.Loc, Name); 2580 if (DeclType.Ptr.TypeQuals) 2581 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Ptr.TypeQuals); 2582 2583 break; 2584 case DeclaratorChunk::Reference: { 2585 // Verify that we're not building a reference to pointer to function with 2586 // exception specification. 2587 if (LangOpts.CPlusPlus && S.CheckDistantExceptionSpec(T)) { 2588 S.Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 2589 D.setInvalidType(true); 2590 // Build the type anyway. 2591 } 2592 T = S.BuildReferenceType(T, DeclType.Ref.LValueRef, DeclType.Loc, Name); 2593 2594 Qualifiers Quals; 2595 if (DeclType.Ref.HasRestrict) 2596 T = S.BuildQualifiedType(T, DeclType.Loc, Qualifiers::Restrict); 2597 break; 2598 } 2599 case DeclaratorChunk::Array: { 2600 // Verify that we're not building an array of pointers to function with 2601 // exception specification. 2602 if (LangOpts.CPlusPlus && S.CheckDistantExceptionSpec(T)) { 2603 S.Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 2604 D.setInvalidType(true); 2605 // Build the type anyway. 2606 } 2607 DeclaratorChunk::ArrayTypeInfo &ATI = DeclType.Arr; 2608 Expr *ArraySize = static_cast<Expr*>(ATI.NumElts); 2609 ArrayType::ArraySizeModifier ASM; 2610 if (ATI.isStar) 2611 ASM = ArrayType::Star; 2612 else if (ATI.hasStatic) 2613 ASM = ArrayType::Static; 2614 else 2615 ASM = ArrayType::Normal; 2616 if (ASM == ArrayType::Star && !D.isPrototypeContext()) { 2617 // FIXME: This check isn't quite right: it allows star in prototypes 2618 // for function definitions, and disallows some edge cases detailed 2619 // in http://gcc.gnu.org/ml/gcc-patches/2009-02/msg00133.html 2620 S.Diag(DeclType.Loc, diag::err_array_star_outside_prototype); 2621 ASM = ArrayType::Normal; 2622 D.setInvalidType(true); 2623 } 2624 2625 // C99 6.7.5.2p1: The optional type qualifiers and the keyword static 2626 // shall appear only in a declaration of a function parameter with an 2627 // array type, ... 2628 if (ASM == ArrayType::Static || ATI.TypeQuals) { 2629 if (!(D.isPrototypeContext() || 2630 D.getContext() == Declarator::KNRTypeListContext)) { 2631 S.Diag(DeclType.Loc, diag::err_array_static_outside_prototype) << 2632 (ASM == ArrayType::Static ? "'static'" : "type qualifier"); 2633 // Remove the 'static' and the type qualifiers. 2634 if (ASM == ArrayType::Static) 2635 ASM = ArrayType::Normal; 2636 ATI.TypeQuals = 0; 2637 D.setInvalidType(true); 2638 } 2639 2640 // C99 6.7.5.2p1: ... and then only in the outermost array type 2641 // derivation. 2642 unsigned x = chunkIndex; 2643 while (x != 0) { 2644 // Walk outwards along the declarator chunks. 2645 x--; 2646 const DeclaratorChunk &DC = D.getTypeObject(x); 2647 switch (DC.Kind) { 2648 case DeclaratorChunk::Paren: 2649 continue; 2650 case DeclaratorChunk::Array: 2651 case DeclaratorChunk::Pointer: 2652 case DeclaratorChunk::Reference: 2653 case DeclaratorChunk::MemberPointer: 2654 S.Diag(DeclType.Loc, diag::err_array_static_not_outermost) << 2655 (ASM == ArrayType::Static ? "'static'" : "type qualifier"); 2656 if (ASM == ArrayType::Static) 2657 ASM = ArrayType::Normal; 2658 ATI.TypeQuals = 0; 2659 D.setInvalidType(true); 2660 break; 2661 case DeclaratorChunk::Function: 2662 case DeclaratorChunk::BlockPointer: 2663 // These are invalid anyway, so just ignore. 2664 break; 2665 } 2666 } 2667 } 2668 2669 if (const AutoType *AT = T->getContainedAutoType()) { 2670 // We've already diagnosed this for decltype(auto). 2671 if (!AT->isDecltypeAuto()) 2672 S.Diag(DeclType.Loc, diag::err_illegal_decl_array_of_auto) 2673 << getPrintableNameForEntity(Name) << T; 2674 T = QualType(); 2675 break; 2676 } 2677 2678 T = S.BuildArrayType(T, ASM, ArraySize, ATI.TypeQuals, 2679 SourceRange(DeclType.Loc, DeclType.EndLoc), Name); 2680 break; 2681 } 2682 case DeclaratorChunk::Function: { 2683 // If the function declarator has a prototype (i.e. it is not () and 2684 // does not have a K&R-style identifier list), then the arguments are part 2685 // of the type, otherwise the argument list is (). 2686 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun; 2687 IsQualifiedFunction = FTI.TypeQuals || FTI.hasRefQualifier(); 2688 2689 // Check for auto functions and trailing return type and adjust the 2690 // return type accordingly. 2691 if (!D.isInvalidType()) { 2692 // trailing-return-type is only required if we're declaring a function, 2693 // and not, for instance, a pointer to a function. 2694 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto && 2695 !FTI.hasTrailingReturnType() && chunkIndex == 0 && 2696 !S.getLangOpts().CPlusPlus1y) { 2697 S.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 2698 diag::err_auto_missing_trailing_return); 2699 T = Context.IntTy; 2700 D.setInvalidType(true); 2701 } else if (FTI.hasTrailingReturnType()) { 2702 // T must be exactly 'auto' at this point. See CWG issue 681. 2703 if (isa<ParenType>(T)) { 2704 S.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 2705 diag::err_trailing_return_in_parens) 2706 << T << D.getDeclSpec().getSourceRange(); 2707 D.setInvalidType(true); 2708 } else if (D.getContext() != Declarator::LambdaExprContext && 2709 (T.hasQualifiers() || !isa<AutoType>(T) || 2710 cast<AutoType>(T)->isDecltypeAuto())) { 2711 S.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 2712 diag::err_trailing_return_without_auto) 2713 << T << D.getDeclSpec().getSourceRange(); 2714 D.setInvalidType(true); 2715 } 2716 T = S.GetTypeFromParser(FTI.getTrailingReturnType(), &TInfo); 2717 if (T.isNull()) { 2718 // An error occurred parsing the trailing return type. 2719 T = Context.IntTy; 2720 D.setInvalidType(true); 2721 } 2722 } 2723 } 2724 2725 // C99 6.7.5.3p1: The return type may not be a function or array type. 2726 // For conversion functions, we'll diagnose this particular error later. 2727 if ((T->isArrayType() || T->isFunctionType()) && 2728 (D.getName().getKind() != UnqualifiedId::IK_ConversionFunctionId)) { 2729 unsigned diagID = diag::err_func_returning_array_function; 2730 // Last processing chunk in block context means this function chunk 2731 // represents the block. 2732 if (chunkIndex == 0 && 2733 D.getContext() == Declarator::BlockLiteralContext) 2734 diagID = diag::err_block_returning_array_function; 2735 S.Diag(DeclType.Loc, diagID) << T->isFunctionType() << T; 2736 T = Context.IntTy; 2737 D.setInvalidType(true); 2738 } 2739 2740 // Do not allow returning half FP value. 2741 // FIXME: This really should be in BuildFunctionType. 2742 if (T->isHalfType()) { 2743 if (S.getLangOpts().OpenCL) { 2744 if (!S.getOpenCLOptions().cl_khr_fp16) { 2745 S.Diag(D.getIdentifierLoc(), diag::err_opencl_half_return) << T; 2746 D.setInvalidType(true); 2747 } 2748 } else { 2749 S.Diag(D.getIdentifierLoc(), 2750 diag::err_parameters_retval_cannot_have_fp16_type) << 1; 2751 D.setInvalidType(true); 2752 } 2753 } 2754 2755 // Methods cannot return interface types. All ObjC objects are 2756 // passed by reference. 2757 if (T->isObjCObjectType()) { 2758 SourceLocation DiagLoc, FixitLoc; 2759 if (TInfo) { 2760 DiagLoc = TInfo->getTypeLoc().getLocStart(); 2761 FixitLoc = S.PP.getLocForEndOfToken(TInfo->getTypeLoc().getLocEnd()); 2762 } else { 2763 DiagLoc = D.getDeclSpec().getTypeSpecTypeLoc(); 2764 FixitLoc = S.PP.getLocForEndOfToken(D.getDeclSpec().getLocEnd()); 2765 } 2766 S.Diag(DiagLoc, diag::err_object_cannot_be_passed_returned_by_value) 2767 << 0 << T 2768 << FixItHint::CreateInsertion(FixitLoc, "*"); 2769 2770 T = Context.getObjCObjectPointerType(T); 2771 if (TInfo) { 2772 TypeLocBuilder TLB; 2773 TLB.pushFullCopy(TInfo->getTypeLoc()); 2774 ObjCObjectPointerTypeLoc TLoc = TLB.push<ObjCObjectPointerTypeLoc>(T); 2775 TLoc.setStarLoc(FixitLoc); 2776 TInfo = TLB.getTypeSourceInfo(Context, T); 2777 } 2778 2779 D.setInvalidType(true); 2780 } 2781 2782 // cv-qualifiers on return types are pointless except when the type is a 2783 // class type in C++. 2784 if ((T.getCVRQualifiers() || T->isAtomicType()) && 2785 !(S.getLangOpts().CPlusPlus && 2786 (T->isDependentType() || T->isRecordType()))) 2787 diagnoseIgnoredFunctionQualifiers(S, T, D, chunkIndex); 2788 2789 // Objective-C ARC ownership qualifiers are ignored on the function 2790 // return type (by type canonicalization). Complain if this attribute 2791 // was written here. 2792 if (T.getQualifiers().hasObjCLifetime()) { 2793 SourceLocation AttrLoc; 2794 if (chunkIndex + 1 < D.getNumTypeObjects()) { 2795 DeclaratorChunk ReturnTypeChunk = D.getTypeObject(chunkIndex + 1); 2796 for (const AttributeList *Attr = ReturnTypeChunk.getAttrs(); 2797 Attr; Attr = Attr->getNext()) { 2798 if (Attr->getKind() == AttributeList::AT_ObjCOwnership) { 2799 AttrLoc = Attr->getLoc(); 2800 break; 2801 } 2802 } 2803 } 2804 if (AttrLoc.isInvalid()) { 2805 for (const AttributeList *Attr 2806 = D.getDeclSpec().getAttributes().getList(); 2807 Attr; Attr = Attr->getNext()) { 2808 if (Attr->getKind() == AttributeList::AT_ObjCOwnership) { 2809 AttrLoc = Attr->getLoc(); 2810 break; 2811 } 2812 } 2813 } 2814 2815 if (AttrLoc.isValid()) { 2816 // The ownership attributes are almost always written via 2817 // the predefined 2818 // __strong/__weak/__autoreleasing/__unsafe_unretained. 2819 if (AttrLoc.isMacroID()) 2820 AttrLoc = S.SourceMgr.getImmediateExpansionRange(AttrLoc).first; 2821 2822 S.Diag(AttrLoc, diag::warn_arc_lifetime_result_type) 2823 << T.getQualifiers().getObjCLifetime(); 2824 } 2825 } 2826 2827 if (LangOpts.CPlusPlus && D.getDeclSpec().isTypeSpecOwned()) { 2828 // C++ [dcl.fct]p6: 2829 // Types shall not be defined in return or parameter types. 2830 TagDecl *Tag = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 2831 if (Tag->isCompleteDefinition()) 2832 S.Diag(Tag->getLocation(), diag::err_type_defined_in_result_type) 2833 << Context.getTypeDeclType(Tag); 2834 } 2835 2836 // Exception specs are not allowed in typedefs. Complain, but add it 2837 // anyway. 2838 if (IsTypedefName && FTI.getExceptionSpecType()) 2839 S.Diag(FTI.getExceptionSpecLoc(), diag::err_exception_spec_in_typedef) 2840 << (D.getContext() == Declarator::AliasDeclContext || 2841 D.getContext() == Declarator::AliasTemplateContext); 2842 2843 // If we see "T var();" or "T var(T());" at block scope, it is probably 2844 // an attempt to initialize a variable, not a function declaration. 2845 if (FTI.isAmbiguous) 2846 warnAboutAmbiguousFunction(S, D, DeclType, T); 2847 2848 FunctionType::ExtInfo EI(getCCForDeclaratorChunk(S, D, FTI, chunkIndex)); 2849 2850 if (!FTI.NumArgs && !FTI.isVariadic && !LangOpts.CPlusPlus) { 2851 // Simple void foo(), where the incoming T is the result type. 2852 T = Context.getFunctionNoProtoType(T, EI); 2853 } else { 2854 // We allow a zero-parameter variadic function in C if the 2855 // function is marked with the "overloadable" attribute. Scan 2856 // for this attribute now. 2857 if (!FTI.NumArgs && FTI.isVariadic && !LangOpts.CPlusPlus) { 2858 bool Overloadable = false; 2859 for (const AttributeList *Attrs = D.getAttributes(); 2860 Attrs; Attrs = Attrs->getNext()) { 2861 if (Attrs->getKind() == AttributeList::AT_Overloadable) { 2862 Overloadable = true; 2863 break; 2864 } 2865 } 2866 2867 if (!Overloadable) 2868 S.Diag(FTI.getEllipsisLoc(), diag::err_ellipsis_first_arg); 2869 } 2870 2871 if (FTI.NumArgs && FTI.ArgInfo[0].Param == 0) { 2872 // C99 6.7.5.3p3: Reject int(x,y,z) when it's not a function 2873 // definition. 2874 S.Diag(FTI.ArgInfo[0].IdentLoc, diag::err_ident_list_in_fn_declaration); 2875 D.setInvalidType(true); 2876 // Recover by creating a K&R-style function type. 2877 T = Context.getFunctionNoProtoType(T, EI); 2878 break; 2879 } 2880 2881 FunctionProtoType::ExtProtoInfo EPI; 2882 EPI.ExtInfo = EI; 2883 EPI.Variadic = FTI.isVariadic; 2884 EPI.HasTrailingReturn = FTI.hasTrailingReturnType(); 2885 EPI.TypeQuals = FTI.TypeQuals; 2886 EPI.RefQualifier = !FTI.hasRefQualifier()? RQ_None 2887 : FTI.RefQualifierIsLValueRef? RQ_LValue 2888 : RQ_RValue; 2889 2890 // Otherwise, we have a function with an argument list that is 2891 // potentially variadic. 2892 SmallVector<QualType, 16> ArgTys; 2893 ArgTys.reserve(FTI.NumArgs); 2894 2895 SmallVector<bool, 16> ConsumedArguments; 2896 ConsumedArguments.reserve(FTI.NumArgs); 2897 bool HasAnyConsumedArguments = false; 2898 2899 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 2900 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 2901 QualType ArgTy = Param->getType(); 2902 assert(!ArgTy.isNull() && "Couldn't parse type?"); 2903 2904 // Look for 'void'. void is allowed only as a single argument to a 2905 // function with no other parameters (C99 6.7.5.3p10). We record 2906 // int(void) as a FunctionProtoType with an empty argument list. 2907 if (ArgTy->isVoidType()) { 2908 // If this is something like 'float(int, void)', reject it. 'void' 2909 // is an incomplete type (C99 6.2.5p19) and function decls cannot 2910 // have arguments of incomplete type. 2911 if (FTI.NumArgs != 1 || FTI.isVariadic) { 2912 S.Diag(DeclType.Loc, diag::err_void_only_param); 2913 ArgTy = Context.IntTy; 2914 Param->setType(ArgTy); 2915 } else if (FTI.ArgInfo[i].Ident) { 2916 // Reject, but continue to parse 'int(void abc)'. 2917 S.Diag(FTI.ArgInfo[i].IdentLoc, 2918 diag::err_param_with_void_type); 2919 ArgTy = Context.IntTy; 2920 Param->setType(ArgTy); 2921 } else { 2922 // Reject, but continue to parse 'float(const void)'. 2923 if (ArgTy.hasQualifiers()) 2924 S.Diag(DeclType.Loc, diag::err_void_param_qualified); 2925 2926 // Do not add 'void' to the ArgTys list. 2927 break; 2928 } 2929 } else if (ArgTy->isHalfType()) { 2930 // Disallow half FP arguments. 2931 // FIXME: This really should be in BuildFunctionType. 2932 if (S.getLangOpts().OpenCL) { 2933 if (!S.getOpenCLOptions().cl_khr_fp16) { 2934 S.Diag(Param->getLocation(), 2935 diag::err_opencl_half_argument) << ArgTy; 2936 D.setInvalidType(); 2937 Param->setInvalidDecl(); 2938 } 2939 } else { 2940 S.Diag(Param->getLocation(), 2941 diag::err_parameters_retval_cannot_have_fp16_type) << 0; 2942 D.setInvalidType(); 2943 } 2944 } else if (!FTI.hasPrototype) { 2945 if (ArgTy->isPromotableIntegerType()) { 2946 ArgTy = Context.getPromotedIntegerType(ArgTy); 2947 Param->setKNRPromoted(true); 2948 } else if (const BuiltinType* BTy = ArgTy->getAs<BuiltinType>()) { 2949 if (BTy->getKind() == BuiltinType::Float) { 2950 ArgTy = Context.DoubleTy; 2951 Param->setKNRPromoted(true); 2952 } 2953 } 2954 } 2955 2956 if (LangOpts.ObjCAutoRefCount) { 2957 bool Consumed = Param->hasAttr<NSConsumedAttr>(); 2958 ConsumedArguments.push_back(Consumed); 2959 HasAnyConsumedArguments |= Consumed; 2960 } 2961 2962 ArgTys.push_back(ArgTy); 2963 } 2964 2965 if (HasAnyConsumedArguments) 2966 EPI.ConsumedArguments = ConsumedArguments.data(); 2967 2968 SmallVector<QualType, 4> Exceptions; 2969 SmallVector<ParsedType, 2> DynamicExceptions; 2970 SmallVector<SourceRange, 2> DynamicExceptionRanges; 2971 Expr *NoexceptExpr = 0; 2972 2973 if (FTI.getExceptionSpecType() == EST_Dynamic) { 2974 // FIXME: It's rather inefficient to have to split into two vectors 2975 // here. 2976 unsigned N = FTI.NumExceptions; 2977 DynamicExceptions.reserve(N); 2978 DynamicExceptionRanges.reserve(N); 2979 for (unsigned I = 0; I != N; ++I) { 2980 DynamicExceptions.push_back(FTI.Exceptions[I].Ty); 2981 DynamicExceptionRanges.push_back(FTI.Exceptions[I].Range); 2982 } 2983 } else if (FTI.getExceptionSpecType() == EST_ComputedNoexcept) { 2984 NoexceptExpr = FTI.NoexceptExpr; 2985 } 2986 2987 S.checkExceptionSpecification(FTI.getExceptionSpecType(), 2988 DynamicExceptions, 2989 DynamicExceptionRanges, 2990 NoexceptExpr, 2991 Exceptions, 2992 EPI); 2993 2994 T = Context.getFunctionType(T, ArgTys, EPI); 2995 } 2996 2997 break; 2998 } 2999 case DeclaratorChunk::MemberPointer: 3000 // The scope spec must refer to a class, or be dependent. 3001 CXXScopeSpec &SS = DeclType.Mem.Scope(); 3002 QualType ClsType; 3003 if (SS.isInvalid()) { 3004 // Avoid emitting extra errors if we already errored on the scope. 3005 D.setInvalidType(true); 3006 } else if (S.isDependentScopeSpecifier(SS) || 3007 dyn_cast_or_null<CXXRecordDecl>(S.computeDeclContext(SS))) { 3008 NestedNameSpecifier *NNS 3009 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 3010 NestedNameSpecifier *NNSPrefix = NNS->getPrefix(); 3011 switch (NNS->getKind()) { 3012 case NestedNameSpecifier::Identifier: 3013 ClsType = Context.getDependentNameType(ETK_None, NNSPrefix, 3014 NNS->getAsIdentifier()); 3015 break; 3016 3017 case NestedNameSpecifier::Namespace: 3018 case NestedNameSpecifier::NamespaceAlias: 3019 case NestedNameSpecifier::Global: 3020 llvm_unreachable("Nested-name-specifier must name a type"); 3021 3022 case NestedNameSpecifier::TypeSpec: 3023 case NestedNameSpecifier::TypeSpecWithTemplate: 3024 ClsType = QualType(NNS->getAsType(), 0); 3025 // Note: if the NNS has a prefix and ClsType is a nondependent 3026 // TemplateSpecializationType, then the NNS prefix is NOT included 3027 // in ClsType; hence we wrap ClsType into an ElaboratedType. 3028 // NOTE: in particular, no wrap occurs if ClsType already is an 3029 // Elaborated, DependentName, or DependentTemplateSpecialization. 3030 if (NNSPrefix && isa<TemplateSpecializationType>(NNS->getAsType())) 3031 ClsType = Context.getElaboratedType(ETK_None, NNSPrefix, ClsType); 3032 break; 3033 } 3034 } else { 3035 S.Diag(DeclType.Mem.Scope().getBeginLoc(), 3036 diag::err_illegal_decl_mempointer_in_nonclass) 3037 << (D.getIdentifier() ? D.getIdentifier()->getName() : "type name") 3038 << DeclType.Mem.Scope().getRange(); 3039 D.setInvalidType(true); 3040 } 3041 3042 if (!ClsType.isNull()) 3043 T = S.BuildMemberPointerType(T, ClsType, DeclType.Loc, D.getIdentifier()); 3044 if (T.isNull()) { 3045 T = Context.IntTy; 3046 D.setInvalidType(true); 3047 } else if (DeclType.Mem.TypeQuals) { 3048 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Mem.TypeQuals); 3049 } 3050 break; 3051 } 3052 3053 if (T.isNull()) { 3054 D.setInvalidType(true); 3055 T = Context.IntTy; 3056 } 3057 3058 // See if there are any attributes on this declarator chunk. 3059 if (AttributeList *attrs = const_cast<AttributeList*>(DeclType.getAttrs())) 3060 processTypeAttrs(state, T, TAL_DeclChunk, attrs); 3061 } 3062 3063 if (LangOpts.CPlusPlus && T->isFunctionType()) { 3064 const FunctionProtoType *FnTy = T->getAs<FunctionProtoType>(); 3065 assert(FnTy && "Why oh why is there not a FunctionProtoType here?"); 3066 3067 // C++ 8.3.5p4: 3068 // A cv-qualifier-seq shall only be part of the function type 3069 // for a nonstatic member function, the function type to which a pointer 3070 // to member refers, or the top-level function type of a function typedef 3071 // declaration. 3072 // 3073 // Core issue 547 also allows cv-qualifiers on function types that are 3074 // top-level template type arguments. 3075 bool FreeFunction; 3076 if (!D.getCXXScopeSpec().isSet()) { 3077 FreeFunction = ((D.getContext() != Declarator::MemberContext && 3078 D.getContext() != Declarator::LambdaExprContext) || 3079 D.getDeclSpec().isFriendSpecified()); 3080 } else { 3081 DeclContext *DC = S.computeDeclContext(D.getCXXScopeSpec()); 3082 FreeFunction = (DC && !DC->isRecord()); 3083 } 3084 3085 // C++11 [dcl.fct]p6 (w/DR1417): 3086 // An attempt to specify a function type with a cv-qualifier-seq or a 3087 // ref-qualifier (including by typedef-name) is ill-formed unless it is: 3088 // - the function type for a non-static member function, 3089 // - the function type to which a pointer to member refers, 3090 // - the top-level function type of a function typedef declaration or 3091 // alias-declaration, 3092 // - the type-id in the default argument of a type-parameter, or 3093 // - the type-id of a template-argument for a type-parameter 3094 if (IsQualifiedFunction && 3095 !(!FreeFunction && 3096 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) && 3097 !IsTypedefName && 3098 D.getContext() != Declarator::TemplateTypeArgContext) { 3099 SourceLocation Loc = D.getLocStart(); 3100 SourceRange RemovalRange; 3101 unsigned I; 3102 if (D.isFunctionDeclarator(I)) { 3103 SmallVector<SourceLocation, 4> RemovalLocs; 3104 const DeclaratorChunk &Chunk = D.getTypeObject(I); 3105 assert(Chunk.Kind == DeclaratorChunk::Function); 3106 if (Chunk.Fun.hasRefQualifier()) 3107 RemovalLocs.push_back(Chunk.Fun.getRefQualifierLoc()); 3108 if (Chunk.Fun.TypeQuals & Qualifiers::Const) 3109 RemovalLocs.push_back(Chunk.Fun.getConstQualifierLoc()); 3110 if (Chunk.Fun.TypeQuals & Qualifiers::Volatile) 3111 RemovalLocs.push_back(Chunk.Fun.getVolatileQualifierLoc()); 3112 // FIXME: We do not track the location of the __restrict qualifier. 3113 //if (Chunk.Fun.TypeQuals & Qualifiers::Restrict) 3114 // RemovalLocs.push_back(Chunk.Fun.getRestrictQualifierLoc()); 3115 if (!RemovalLocs.empty()) { 3116 std::sort(RemovalLocs.begin(), RemovalLocs.end(), 3117 BeforeThanCompare<SourceLocation>(S.getSourceManager())); 3118 RemovalRange = SourceRange(RemovalLocs.front(), RemovalLocs.back()); 3119 Loc = RemovalLocs.front(); 3120 } 3121 } 3122 3123 S.Diag(Loc, diag::err_invalid_qualified_function_type) 3124 << FreeFunction << D.isFunctionDeclarator() << T 3125 << getFunctionQualifiersAsString(FnTy) 3126 << FixItHint::CreateRemoval(RemovalRange); 3127 3128 // Strip the cv-qualifiers and ref-qualifiers from the type. 3129 FunctionProtoType::ExtProtoInfo EPI = FnTy->getExtProtoInfo(); 3130 EPI.TypeQuals = 0; 3131 EPI.RefQualifier = RQ_None; 3132 3133 T = Context.getFunctionType(FnTy->getResultType(), FnTy->getArgTypes(), 3134 EPI); 3135 // Rebuild any parens around the identifier in the function type. 3136 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 3137 if (D.getTypeObject(i).Kind != DeclaratorChunk::Paren) 3138 break; 3139 T = S.BuildParenType(T); 3140 } 3141 } 3142 } 3143 3144 // Apply any undistributed attributes from the declarator. 3145 if (!T.isNull()) 3146 if (AttributeList *attrs = D.getAttributes()) 3147 processTypeAttrs(state, T, TAL_DeclName, attrs); 3148 3149 // Diagnose any ignored type attributes. 3150 if (!T.isNull()) state.diagnoseIgnoredTypeAttrs(T); 3151 3152 // C++0x [dcl.constexpr]p9: 3153 // A constexpr specifier used in an object declaration declares the object 3154 // as const. 3155 if (D.getDeclSpec().isConstexprSpecified() && T->isObjectType()) { 3156 T.addConst(); 3157 } 3158 3159 // If there was an ellipsis in the declarator, the declaration declares a 3160 // parameter pack whose type may be a pack expansion type. 3161 if (D.hasEllipsis() && !T.isNull()) { 3162 // C++0x [dcl.fct]p13: 3163 // A declarator-id or abstract-declarator containing an ellipsis shall 3164 // only be used in a parameter-declaration. Such a parameter-declaration 3165 // is a parameter pack (14.5.3). [...] 3166 switch (D.getContext()) { 3167 case Declarator::PrototypeContext: 3168 // C++0x [dcl.fct]p13: 3169 // [...] When it is part of a parameter-declaration-clause, the 3170 // parameter pack is a function parameter pack (14.5.3). The type T 3171 // of the declarator-id of the function parameter pack shall contain 3172 // a template parameter pack; each template parameter pack in T is 3173 // expanded by the function parameter pack. 3174 // 3175 // We represent function parameter packs as function parameters whose 3176 // type is a pack expansion. 3177 if (!T->containsUnexpandedParameterPack()) { 3178 S.Diag(D.getEllipsisLoc(), 3179 diag::err_function_parameter_pack_without_parameter_packs) 3180 << T << D.getSourceRange(); 3181 D.setEllipsisLoc(SourceLocation()); 3182 } else { 3183 T = Context.getPackExpansionType(T, None); 3184 } 3185 break; 3186 3187 case Declarator::TemplateParamContext: 3188 // C++0x [temp.param]p15: 3189 // If a template-parameter is a [...] is a parameter-declaration that 3190 // declares a parameter pack (8.3.5), then the template-parameter is a 3191 // template parameter pack (14.5.3). 3192 // 3193 // Note: core issue 778 clarifies that, if there are any unexpanded 3194 // parameter packs in the type of the non-type template parameter, then 3195 // it expands those parameter packs. 3196 if (T->containsUnexpandedParameterPack()) 3197 T = Context.getPackExpansionType(T, None); 3198 else 3199 S.Diag(D.getEllipsisLoc(), 3200 LangOpts.CPlusPlus11 3201 ? diag::warn_cxx98_compat_variadic_templates 3202 : diag::ext_variadic_templates); 3203 break; 3204 3205 case Declarator::FileContext: 3206 case Declarator::KNRTypeListContext: 3207 case Declarator::ObjCParameterContext: // FIXME: special diagnostic here? 3208 case Declarator::ObjCResultContext: // FIXME: special diagnostic here? 3209 case Declarator::TypeNameContext: 3210 case Declarator::CXXNewContext: 3211 case Declarator::AliasDeclContext: 3212 case Declarator::AliasTemplateContext: 3213 case Declarator::MemberContext: 3214 case Declarator::BlockContext: 3215 case Declarator::ForContext: 3216 case Declarator::ConditionContext: 3217 case Declarator::CXXCatchContext: 3218 case Declarator::ObjCCatchContext: 3219 case Declarator::BlockLiteralContext: 3220 case Declarator::LambdaExprContext: 3221 case Declarator::ConversionIdContext: 3222 case Declarator::TrailingReturnContext: 3223 case Declarator::TemplateTypeArgContext: 3224 // FIXME: We may want to allow parameter packs in block-literal contexts 3225 // in the future. 3226 S.Diag(D.getEllipsisLoc(), diag::err_ellipsis_in_declarator_not_parameter); 3227 D.setEllipsisLoc(SourceLocation()); 3228 break; 3229 } 3230 } 3231 3232 if (T.isNull()) 3233 return Context.getNullTypeSourceInfo(); 3234 else if (D.isInvalidType()) 3235 return Context.getTrivialTypeSourceInfo(T); 3236 3237 return S.GetTypeSourceInfoForDeclarator(D, T, TInfo); 3238} 3239 3240/// GetTypeForDeclarator - Convert the type for the specified 3241/// declarator to Type instances. 3242/// 3243/// The result of this call will never be null, but the associated 3244/// type may be a null type if there's an unrecoverable error. 3245TypeSourceInfo *Sema::GetTypeForDeclarator(Declarator &D, Scope *S) { 3246 // Determine the type of the declarator. Not all forms of declarator 3247 // have a type. 3248 3249 TypeProcessingState state(*this, D); 3250 3251 TypeSourceInfo *ReturnTypeInfo = 0; 3252 QualType T = GetDeclSpecTypeForDeclarator(state, ReturnTypeInfo); 3253 if (T.isNull()) 3254 return Context.getNullTypeSourceInfo(); 3255 3256 if (D.isPrototypeContext() && getLangOpts().ObjCAutoRefCount) 3257 inferARCWriteback(state, T); 3258 3259 return GetFullTypeForDeclarator(state, T, ReturnTypeInfo); 3260} 3261 3262static void transferARCOwnershipToDeclSpec(Sema &S, 3263 QualType &declSpecTy, 3264 Qualifiers::ObjCLifetime ownership) { 3265 if (declSpecTy->isObjCRetainableType() && 3266 declSpecTy.getObjCLifetime() == Qualifiers::OCL_None) { 3267 Qualifiers qs; 3268 qs.addObjCLifetime(ownership); 3269 declSpecTy = S.Context.getQualifiedType(declSpecTy, qs); 3270 } 3271} 3272 3273static void transferARCOwnershipToDeclaratorChunk(TypeProcessingState &state, 3274 Qualifiers::ObjCLifetime ownership, 3275 unsigned chunkIndex) { 3276 Sema &S = state.getSema(); 3277 Declarator &D = state.getDeclarator(); 3278 3279 // Look for an explicit lifetime attribute. 3280 DeclaratorChunk &chunk = D.getTypeObject(chunkIndex); 3281 for (const AttributeList *attr = chunk.getAttrs(); attr; 3282 attr = attr->getNext()) 3283 if (attr->getKind() == AttributeList::AT_ObjCOwnership) 3284 return; 3285 3286 const char *attrStr = 0; 3287 switch (ownership) { 3288 case Qualifiers::OCL_None: llvm_unreachable("no ownership!"); 3289 case Qualifiers::OCL_ExplicitNone: attrStr = "none"; break; 3290 case Qualifiers::OCL_Strong: attrStr = "strong"; break; 3291 case Qualifiers::OCL_Weak: attrStr = "weak"; break; 3292 case Qualifiers::OCL_Autoreleasing: attrStr = "autoreleasing"; break; 3293 } 3294 3295 IdentifierLoc *Arg = new (S.Context) IdentifierLoc; 3296 Arg->Ident = &S.Context.Idents.get(attrStr); 3297 Arg->Loc = SourceLocation(); 3298 3299 ArgsUnion Args(Arg); 3300 3301 // If there wasn't one, add one (with an invalid source location 3302 // so that we don't make an AttributedType for it). 3303 AttributeList *attr = D.getAttributePool() 3304 .create(&S.Context.Idents.get("objc_ownership"), SourceLocation(), 3305 /*scope*/ 0, SourceLocation(), 3306 /*args*/ &Args, 1, AttributeList::AS_GNU); 3307 spliceAttrIntoList(*attr, chunk.getAttrListRef()); 3308 3309 // TODO: mark whether we did this inference? 3310} 3311 3312/// \brief Used for transferring ownership in casts resulting in l-values. 3313static void transferARCOwnership(TypeProcessingState &state, 3314 QualType &declSpecTy, 3315 Qualifiers::ObjCLifetime ownership) { 3316 Sema &S = state.getSema(); 3317 Declarator &D = state.getDeclarator(); 3318 3319 int inner = -1; 3320 bool hasIndirection = false; 3321 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 3322 DeclaratorChunk &chunk = D.getTypeObject(i); 3323 switch (chunk.Kind) { 3324 case DeclaratorChunk::Paren: 3325 // Ignore parens. 3326 break; 3327 3328 case DeclaratorChunk::Array: 3329 case DeclaratorChunk::Reference: 3330 case DeclaratorChunk::Pointer: 3331 if (inner != -1) 3332 hasIndirection = true; 3333 inner = i; 3334 break; 3335 3336 case DeclaratorChunk::BlockPointer: 3337 if (inner != -1) 3338 transferARCOwnershipToDeclaratorChunk(state, ownership, i); 3339 return; 3340 3341 case DeclaratorChunk::Function: 3342 case DeclaratorChunk::MemberPointer: 3343 return; 3344 } 3345 } 3346 3347 if (inner == -1) 3348 return; 3349 3350 DeclaratorChunk &chunk = D.getTypeObject(inner); 3351 if (chunk.Kind == DeclaratorChunk::Pointer) { 3352 if (declSpecTy->isObjCRetainableType()) 3353 return transferARCOwnershipToDeclSpec(S, declSpecTy, ownership); 3354 if (declSpecTy->isObjCObjectType() && hasIndirection) 3355 return transferARCOwnershipToDeclaratorChunk(state, ownership, inner); 3356 } else { 3357 assert(chunk.Kind == DeclaratorChunk::Array || 3358 chunk.Kind == DeclaratorChunk::Reference); 3359 return transferARCOwnershipToDeclSpec(S, declSpecTy, ownership); 3360 } 3361} 3362 3363TypeSourceInfo *Sema::GetTypeForDeclaratorCast(Declarator &D, QualType FromTy) { 3364 TypeProcessingState state(*this, D); 3365 3366 TypeSourceInfo *ReturnTypeInfo = 0; 3367 QualType declSpecTy = GetDeclSpecTypeForDeclarator(state, ReturnTypeInfo); 3368 if (declSpecTy.isNull()) 3369 return Context.getNullTypeSourceInfo(); 3370 3371 if (getLangOpts().ObjCAutoRefCount) { 3372 Qualifiers::ObjCLifetime ownership = Context.getInnerObjCOwnership(FromTy); 3373 if (ownership != Qualifiers::OCL_None) 3374 transferARCOwnership(state, declSpecTy, ownership); 3375 } 3376 3377 return GetFullTypeForDeclarator(state, declSpecTy, ReturnTypeInfo); 3378} 3379 3380/// Map an AttributedType::Kind to an AttributeList::Kind. 3381static AttributeList::Kind getAttrListKind(AttributedType::Kind kind) { 3382 switch (kind) { 3383 case AttributedType::attr_address_space: 3384 return AttributeList::AT_AddressSpace; 3385 case AttributedType::attr_regparm: 3386 return AttributeList::AT_Regparm; 3387 case AttributedType::attr_vector_size: 3388 return AttributeList::AT_VectorSize; 3389 case AttributedType::attr_neon_vector_type: 3390 return AttributeList::AT_NeonVectorType; 3391 case AttributedType::attr_neon_polyvector_type: 3392 return AttributeList::AT_NeonPolyVectorType; 3393 case AttributedType::attr_objc_gc: 3394 return AttributeList::AT_ObjCGC; 3395 case AttributedType::attr_objc_ownership: 3396 return AttributeList::AT_ObjCOwnership; 3397 case AttributedType::attr_noreturn: 3398 return AttributeList::AT_NoReturn; 3399 case AttributedType::attr_cdecl: 3400 return AttributeList::AT_CDecl; 3401 case AttributedType::attr_fastcall: 3402 return AttributeList::AT_FastCall; 3403 case AttributedType::attr_stdcall: 3404 return AttributeList::AT_StdCall; 3405 case AttributedType::attr_thiscall: 3406 return AttributeList::AT_ThisCall; 3407 case AttributedType::attr_pascal: 3408 return AttributeList::AT_Pascal; 3409 case AttributedType::attr_pcs: 3410 case AttributedType::attr_pcs_vfp: 3411 return AttributeList::AT_Pcs; 3412 case AttributedType::attr_pnaclcall: 3413 return AttributeList::AT_PnaclCall; 3414 case AttributedType::attr_inteloclbicc: 3415 return AttributeList::AT_IntelOclBicc; 3416 case AttributedType::attr_ms_abi: 3417 return AttributeList::AT_MSABI; 3418 case AttributedType::attr_sysv_abi: 3419 return AttributeList::AT_SysVABI; 3420 case AttributedType::attr_ptr32: 3421 return AttributeList::AT_Ptr32; 3422 case AttributedType::attr_ptr64: 3423 return AttributeList::AT_Ptr64; 3424 case AttributedType::attr_sptr: 3425 return AttributeList::AT_SPtr; 3426 case AttributedType::attr_uptr: 3427 return AttributeList::AT_UPtr; 3428 } 3429 llvm_unreachable("unexpected attribute kind!"); 3430} 3431 3432static void fillAttributedTypeLoc(AttributedTypeLoc TL, 3433 const AttributeList *attrs) { 3434 AttributedType::Kind kind = TL.getAttrKind(); 3435 3436 assert(attrs && "no type attributes in the expected location!"); 3437 AttributeList::Kind parsedKind = getAttrListKind(kind); 3438 while (attrs->getKind() != parsedKind) { 3439 attrs = attrs->getNext(); 3440 assert(attrs && "no matching attribute in expected location!"); 3441 } 3442 3443 TL.setAttrNameLoc(attrs->getLoc()); 3444 if (TL.hasAttrExprOperand() && attrs->isArgExpr(0)) 3445 TL.setAttrExprOperand(attrs->getArgAsExpr(0)); 3446 else if (TL.hasAttrEnumOperand() && attrs->isArgIdent(0)) 3447 TL.setAttrEnumOperandLoc(attrs->getArgAsIdent(0)->Loc); 3448 3449 // FIXME: preserve this information to here. 3450 if (TL.hasAttrOperand()) 3451 TL.setAttrOperandParensRange(SourceRange()); 3452} 3453 3454namespace { 3455 class TypeSpecLocFiller : public TypeLocVisitor<TypeSpecLocFiller> { 3456 ASTContext &Context; 3457 const DeclSpec &DS; 3458 3459 public: 3460 TypeSpecLocFiller(ASTContext &Context, const DeclSpec &DS) 3461 : Context(Context), DS(DS) {} 3462 3463 void VisitAttributedTypeLoc(AttributedTypeLoc TL) { 3464 fillAttributedTypeLoc(TL, DS.getAttributes().getList()); 3465 Visit(TL.getModifiedLoc()); 3466 } 3467 void VisitQualifiedTypeLoc(QualifiedTypeLoc TL) { 3468 Visit(TL.getUnqualifiedLoc()); 3469 } 3470 void VisitTypedefTypeLoc(TypedefTypeLoc TL) { 3471 TL.setNameLoc(DS.getTypeSpecTypeLoc()); 3472 } 3473 void VisitObjCInterfaceTypeLoc(ObjCInterfaceTypeLoc TL) { 3474 TL.setNameLoc(DS.getTypeSpecTypeLoc()); 3475 // FIXME. We should have DS.getTypeSpecTypeEndLoc(). But, it requires 3476 // addition field. What we have is good enough for dispay of location 3477 // of 'fixit' on interface name. 3478 TL.setNameEndLoc(DS.getLocEnd()); 3479 } 3480 void VisitObjCObjectTypeLoc(ObjCObjectTypeLoc TL) { 3481 // Handle the base type, which might not have been written explicitly. 3482 if (DS.getTypeSpecType() == DeclSpec::TST_unspecified) { 3483 TL.setHasBaseTypeAsWritten(false); 3484 TL.getBaseLoc().initialize(Context, SourceLocation()); 3485 } else { 3486 TL.setHasBaseTypeAsWritten(true); 3487 Visit(TL.getBaseLoc()); 3488 } 3489 3490 // Protocol qualifiers. 3491 if (DS.getProtocolQualifiers()) { 3492 assert(TL.getNumProtocols() > 0); 3493 assert(TL.getNumProtocols() == DS.getNumProtocolQualifiers()); 3494 TL.setLAngleLoc(DS.getProtocolLAngleLoc()); 3495 TL.setRAngleLoc(DS.getSourceRange().getEnd()); 3496 for (unsigned i = 0, e = DS.getNumProtocolQualifiers(); i != e; ++i) 3497 TL.setProtocolLoc(i, DS.getProtocolLocs()[i]); 3498 } else { 3499 assert(TL.getNumProtocols() == 0); 3500 TL.setLAngleLoc(SourceLocation()); 3501 TL.setRAngleLoc(SourceLocation()); 3502 } 3503 } 3504 void VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL) { 3505 TL.setStarLoc(SourceLocation()); 3506 Visit(TL.getPointeeLoc()); 3507 } 3508 void VisitTemplateSpecializationTypeLoc(TemplateSpecializationTypeLoc TL) { 3509 TypeSourceInfo *TInfo = 0; 3510 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 3511 3512 // If we got no declarator info from previous Sema routines, 3513 // just fill with the typespec loc. 3514 if (!TInfo) { 3515 TL.initialize(Context, DS.getTypeSpecTypeNameLoc()); 3516 return; 3517 } 3518 3519 TypeLoc OldTL = TInfo->getTypeLoc(); 3520 if (TInfo->getType()->getAs<ElaboratedType>()) { 3521 ElaboratedTypeLoc ElabTL = OldTL.castAs<ElaboratedTypeLoc>(); 3522 TemplateSpecializationTypeLoc NamedTL = ElabTL.getNamedTypeLoc() 3523 .castAs<TemplateSpecializationTypeLoc>(); 3524 TL.copy(NamedTL); 3525 } else { 3526 TL.copy(OldTL.castAs<TemplateSpecializationTypeLoc>()); 3527 assert(TL.getRAngleLoc() == OldTL.castAs<TemplateSpecializationTypeLoc>().getRAngleLoc()); 3528 } 3529 3530 } 3531 void VisitTypeOfExprTypeLoc(TypeOfExprTypeLoc TL) { 3532 assert(DS.getTypeSpecType() == DeclSpec::TST_typeofExpr); 3533 TL.setTypeofLoc(DS.getTypeSpecTypeLoc()); 3534 TL.setParensRange(DS.getTypeofParensRange()); 3535 } 3536 void VisitTypeOfTypeLoc(TypeOfTypeLoc TL) { 3537 assert(DS.getTypeSpecType() == DeclSpec::TST_typeofType); 3538 TL.setTypeofLoc(DS.getTypeSpecTypeLoc()); 3539 TL.setParensRange(DS.getTypeofParensRange()); 3540 assert(DS.getRepAsType()); 3541 TypeSourceInfo *TInfo = 0; 3542 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 3543 TL.setUnderlyingTInfo(TInfo); 3544 } 3545 void VisitUnaryTransformTypeLoc(UnaryTransformTypeLoc TL) { 3546 // FIXME: This holds only because we only have one unary transform. 3547 assert(DS.getTypeSpecType() == DeclSpec::TST_underlyingType); 3548 TL.setKWLoc(DS.getTypeSpecTypeLoc()); 3549 TL.setParensRange(DS.getTypeofParensRange()); 3550 assert(DS.getRepAsType()); 3551 TypeSourceInfo *TInfo = 0; 3552 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 3553 TL.setUnderlyingTInfo(TInfo); 3554 } 3555 void VisitBuiltinTypeLoc(BuiltinTypeLoc TL) { 3556 // By default, use the source location of the type specifier. 3557 TL.setBuiltinLoc(DS.getTypeSpecTypeLoc()); 3558 if (TL.needsExtraLocalData()) { 3559 // Set info for the written builtin specifiers. 3560 TL.getWrittenBuiltinSpecs() = DS.getWrittenBuiltinSpecs(); 3561 // Try to have a meaningful source location. 3562 if (TL.getWrittenSignSpec() != TSS_unspecified) 3563 // Sign spec loc overrides the others (e.g., 'unsigned long'). 3564 TL.setBuiltinLoc(DS.getTypeSpecSignLoc()); 3565 else if (TL.getWrittenWidthSpec() != TSW_unspecified) 3566 // Width spec loc overrides type spec loc (e.g., 'short int'). 3567 TL.setBuiltinLoc(DS.getTypeSpecWidthLoc()); 3568 } 3569 } 3570 void VisitElaboratedTypeLoc(ElaboratedTypeLoc TL) { 3571 ElaboratedTypeKeyword Keyword 3572 = TypeWithKeyword::getKeywordForTypeSpec(DS.getTypeSpecType()); 3573 if (DS.getTypeSpecType() == TST_typename) { 3574 TypeSourceInfo *TInfo = 0; 3575 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 3576 if (TInfo) { 3577 TL.copy(TInfo->getTypeLoc().castAs<ElaboratedTypeLoc>()); 3578 return; 3579 } 3580 } 3581 TL.setElaboratedKeywordLoc(Keyword != ETK_None 3582 ? DS.getTypeSpecTypeLoc() 3583 : SourceLocation()); 3584 const CXXScopeSpec& SS = DS.getTypeSpecScope(); 3585 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 3586 Visit(TL.getNextTypeLoc().getUnqualifiedLoc()); 3587 } 3588 void VisitDependentNameTypeLoc(DependentNameTypeLoc TL) { 3589 assert(DS.getTypeSpecType() == TST_typename); 3590 TypeSourceInfo *TInfo = 0; 3591 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 3592 assert(TInfo); 3593 TL.copy(TInfo->getTypeLoc().castAs<DependentNameTypeLoc>()); 3594 } 3595 void VisitDependentTemplateSpecializationTypeLoc( 3596 DependentTemplateSpecializationTypeLoc TL) { 3597 assert(DS.getTypeSpecType() == TST_typename); 3598 TypeSourceInfo *TInfo = 0; 3599 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 3600 assert(TInfo); 3601 TL.copy( 3602 TInfo->getTypeLoc().castAs<DependentTemplateSpecializationTypeLoc>()); 3603 } 3604 void VisitTagTypeLoc(TagTypeLoc TL) { 3605 TL.setNameLoc(DS.getTypeSpecTypeNameLoc()); 3606 } 3607 void VisitAtomicTypeLoc(AtomicTypeLoc TL) { 3608 // An AtomicTypeLoc can come from either an _Atomic(...) type specifier 3609 // or an _Atomic qualifier. 3610 if (DS.getTypeSpecType() == DeclSpec::TST_atomic) { 3611 TL.setKWLoc(DS.getTypeSpecTypeLoc()); 3612 TL.setParensRange(DS.getTypeofParensRange()); 3613 3614 TypeSourceInfo *TInfo = 0; 3615 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 3616 assert(TInfo); 3617 TL.getValueLoc().initializeFullCopy(TInfo->getTypeLoc()); 3618 } else { 3619 TL.setKWLoc(DS.getAtomicSpecLoc()); 3620 // No parens, to indicate this was spelled as an _Atomic qualifier. 3621 TL.setParensRange(SourceRange()); 3622 Visit(TL.getValueLoc()); 3623 } 3624 } 3625 3626 void VisitTypeLoc(TypeLoc TL) { 3627 // FIXME: add other typespec types and change this to an assert. 3628 TL.initialize(Context, DS.getTypeSpecTypeLoc()); 3629 } 3630 }; 3631 3632 class DeclaratorLocFiller : public TypeLocVisitor<DeclaratorLocFiller> { 3633 ASTContext &Context; 3634 const DeclaratorChunk &Chunk; 3635 3636 public: 3637 DeclaratorLocFiller(ASTContext &Context, const DeclaratorChunk &Chunk) 3638 : Context(Context), Chunk(Chunk) {} 3639 3640 void VisitQualifiedTypeLoc(QualifiedTypeLoc TL) { 3641 llvm_unreachable("qualified type locs not expected here!"); 3642 } 3643 void VisitDecayedTypeLoc(DecayedTypeLoc TL) { 3644 llvm_unreachable("decayed type locs not expected here!"); 3645 } 3646 3647 void VisitAttributedTypeLoc(AttributedTypeLoc TL) { 3648 fillAttributedTypeLoc(TL, Chunk.getAttrs()); 3649 } 3650 void VisitBlockPointerTypeLoc(BlockPointerTypeLoc TL) { 3651 assert(Chunk.Kind == DeclaratorChunk::BlockPointer); 3652 TL.setCaretLoc(Chunk.Loc); 3653 } 3654 void VisitPointerTypeLoc(PointerTypeLoc TL) { 3655 assert(Chunk.Kind == DeclaratorChunk::Pointer); 3656 TL.setStarLoc(Chunk.Loc); 3657 } 3658 void VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL) { 3659 assert(Chunk.Kind == DeclaratorChunk::Pointer); 3660 TL.setStarLoc(Chunk.Loc); 3661 } 3662 void VisitMemberPointerTypeLoc(MemberPointerTypeLoc TL) { 3663 assert(Chunk.Kind == DeclaratorChunk::MemberPointer); 3664 const CXXScopeSpec& SS = Chunk.Mem.Scope(); 3665 NestedNameSpecifierLoc NNSLoc = SS.getWithLocInContext(Context); 3666 3667 const Type* ClsTy = TL.getClass(); 3668 QualType ClsQT = QualType(ClsTy, 0); 3669 TypeSourceInfo *ClsTInfo = Context.CreateTypeSourceInfo(ClsQT, 0); 3670 // Now copy source location info into the type loc component. 3671 TypeLoc ClsTL = ClsTInfo->getTypeLoc(); 3672 switch (NNSLoc.getNestedNameSpecifier()->getKind()) { 3673 case NestedNameSpecifier::Identifier: 3674 assert(isa<DependentNameType>(ClsTy) && "Unexpected TypeLoc"); 3675 { 3676 DependentNameTypeLoc DNTLoc = ClsTL.castAs<DependentNameTypeLoc>(); 3677 DNTLoc.setElaboratedKeywordLoc(SourceLocation()); 3678 DNTLoc.setQualifierLoc(NNSLoc.getPrefix()); 3679 DNTLoc.setNameLoc(NNSLoc.getLocalBeginLoc()); 3680 } 3681 break; 3682 3683 case NestedNameSpecifier::TypeSpec: 3684 case NestedNameSpecifier::TypeSpecWithTemplate: 3685 if (isa<ElaboratedType>(ClsTy)) { 3686 ElaboratedTypeLoc ETLoc = ClsTL.castAs<ElaboratedTypeLoc>(); 3687 ETLoc.setElaboratedKeywordLoc(SourceLocation()); 3688 ETLoc.setQualifierLoc(NNSLoc.getPrefix()); 3689 TypeLoc NamedTL = ETLoc.getNamedTypeLoc(); 3690 NamedTL.initializeFullCopy(NNSLoc.getTypeLoc()); 3691 } else { 3692 ClsTL.initializeFullCopy(NNSLoc.getTypeLoc()); 3693 } 3694 break; 3695 3696 case NestedNameSpecifier::Namespace: 3697 case NestedNameSpecifier::NamespaceAlias: 3698 case NestedNameSpecifier::Global: 3699 llvm_unreachable("Nested-name-specifier must name a type"); 3700 } 3701 3702 // Finally fill in MemberPointerLocInfo fields. 3703 TL.setStarLoc(Chunk.Loc); 3704 TL.setClassTInfo(ClsTInfo); 3705 } 3706 void VisitLValueReferenceTypeLoc(LValueReferenceTypeLoc TL) { 3707 assert(Chunk.Kind == DeclaratorChunk::Reference); 3708 // 'Amp' is misleading: this might have been originally 3709 /// spelled with AmpAmp. 3710 TL.setAmpLoc(Chunk.Loc); 3711 } 3712 void VisitRValueReferenceTypeLoc(RValueReferenceTypeLoc TL) { 3713 assert(Chunk.Kind == DeclaratorChunk::Reference); 3714 assert(!Chunk.Ref.LValueRef); 3715 TL.setAmpAmpLoc(Chunk.Loc); 3716 } 3717 void VisitArrayTypeLoc(ArrayTypeLoc TL) { 3718 assert(Chunk.Kind == DeclaratorChunk::Array); 3719 TL.setLBracketLoc(Chunk.Loc); 3720 TL.setRBracketLoc(Chunk.EndLoc); 3721 TL.setSizeExpr(static_cast<Expr*>(Chunk.Arr.NumElts)); 3722 } 3723 void VisitFunctionTypeLoc(FunctionTypeLoc TL) { 3724 assert(Chunk.Kind == DeclaratorChunk::Function); 3725 TL.setLocalRangeBegin(Chunk.Loc); 3726 TL.setLocalRangeEnd(Chunk.EndLoc); 3727 3728 const DeclaratorChunk::FunctionTypeInfo &FTI = Chunk.Fun; 3729 TL.setLParenLoc(FTI.getLParenLoc()); 3730 TL.setRParenLoc(FTI.getRParenLoc()); 3731 for (unsigned i = 0, e = TL.getNumArgs(), tpi = 0; i != e; ++i) { 3732 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 3733 TL.setArg(tpi++, Param); 3734 } 3735 // FIXME: exception specs 3736 } 3737 void VisitParenTypeLoc(ParenTypeLoc TL) { 3738 assert(Chunk.Kind == DeclaratorChunk::Paren); 3739 TL.setLParenLoc(Chunk.Loc); 3740 TL.setRParenLoc(Chunk.EndLoc); 3741 } 3742 3743 void VisitTypeLoc(TypeLoc TL) { 3744 llvm_unreachable("unsupported TypeLoc kind in declarator!"); 3745 } 3746 }; 3747} 3748 3749static void fillAtomicQualLoc(AtomicTypeLoc ATL, const DeclaratorChunk &Chunk) { 3750 SourceLocation Loc; 3751 switch (Chunk.Kind) { 3752 case DeclaratorChunk::Function: 3753 case DeclaratorChunk::Array: 3754 case DeclaratorChunk::Paren: 3755 llvm_unreachable("cannot be _Atomic qualified"); 3756 3757 case DeclaratorChunk::Pointer: 3758 Loc = SourceLocation::getFromRawEncoding(Chunk.Ptr.AtomicQualLoc); 3759 break; 3760 3761 case DeclaratorChunk::BlockPointer: 3762 case DeclaratorChunk::Reference: 3763 case DeclaratorChunk::MemberPointer: 3764 // FIXME: Provide a source location for the _Atomic keyword. 3765 break; 3766 } 3767 3768 ATL.setKWLoc(Loc); 3769 ATL.setParensRange(SourceRange()); 3770} 3771 3772/// \brief Create and instantiate a TypeSourceInfo with type source information. 3773/// 3774/// \param T QualType referring to the type as written in source code. 3775/// 3776/// \param ReturnTypeInfo For declarators whose return type does not show 3777/// up in the normal place in the declaration specifiers (such as a C++ 3778/// conversion function), this pointer will refer to a type source information 3779/// for that return type. 3780TypeSourceInfo * 3781Sema::GetTypeSourceInfoForDeclarator(Declarator &D, QualType T, 3782 TypeSourceInfo *ReturnTypeInfo) { 3783 TypeSourceInfo *TInfo = Context.CreateTypeSourceInfo(T); 3784 UnqualTypeLoc CurrTL = TInfo->getTypeLoc().getUnqualifiedLoc(); 3785 3786 // Handle parameter packs whose type is a pack expansion. 3787 if (isa<PackExpansionType>(T)) { 3788 CurrTL.castAs<PackExpansionTypeLoc>().setEllipsisLoc(D.getEllipsisLoc()); 3789 CurrTL = CurrTL.getNextTypeLoc().getUnqualifiedLoc(); 3790 } 3791 3792 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 3793 // An AtomicTypeLoc might be produced by an atomic qualifier in this 3794 // declarator chunk. 3795 if (AtomicTypeLoc ATL = CurrTL.getAs<AtomicTypeLoc>()) { 3796 fillAtomicQualLoc(ATL, D.getTypeObject(i)); 3797 CurrTL = ATL.getValueLoc().getUnqualifiedLoc(); 3798 } 3799 3800 while (AttributedTypeLoc TL = CurrTL.getAs<AttributedTypeLoc>()) { 3801 fillAttributedTypeLoc(TL, D.getTypeObject(i).getAttrs()); 3802 CurrTL = TL.getNextTypeLoc().getUnqualifiedLoc(); 3803 } 3804 3805 DeclaratorLocFiller(Context, D.getTypeObject(i)).Visit(CurrTL); 3806 CurrTL = CurrTL.getNextTypeLoc().getUnqualifiedLoc(); 3807 } 3808 3809 // If we have different source information for the return type, use 3810 // that. This really only applies to C++ conversion functions. 3811 if (ReturnTypeInfo) { 3812 TypeLoc TL = ReturnTypeInfo->getTypeLoc(); 3813 assert(TL.getFullDataSize() == CurrTL.getFullDataSize()); 3814 memcpy(CurrTL.getOpaqueData(), TL.getOpaqueData(), TL.getFullDataSize()); 3815 } else { 3816 TypeSpecLocFiller(Context, D.getDeclSpec()).Visit(CurrTL); 3817 } 3818 3819 return TInfo; 3820} 3821 3822/// \brief Create a LocInfoType to hold the given QualType and TypeSourceInfo. 3823ParsedType Sema::CreateParsedType(QualType T, TypeSourceInfo *TInfo) { 3824 // FIXME: LocInfoTypes are "transient", only needed for passing to/from Parser 3825 // and Sema during declaration parsing. Try deallocating/caching them when 3826 // it's appropriate, instead of allocating them and keeping them around. 3827 LocInfoType *LocT = (LocInfoType*)BumpAlloc.Allocate(sizeof(LocInfoType), 3828 TypeAlignment); 3829 new (LocT) LocInfoType(T, TInfo); 3830 assert(LocT->getTypeClass() != T->getTypeClass() && 3831 "LocInfoType's TypeClass conflicts with an existing Type class"); 3832 return ParsedType::make(QualType(LocT, 0)); 3833} 3834 3835void LocInfoType::getAsStringInternal(std::string &Str, 3836 const PrintingPolicy &Policy) const { 3837 llvm_unreachable("LocInfoType leaked into the type system; an opaque TypeTy*" 3838 " was used directly instead of getting the QualType through" 3839 " GetTypeFromParser"); 3840} 3841 3842TypeResult Sema::ActOnTypeName(Scope *S, Declarator &D) { 3843 // C99 6.7.6: Type names have no identifier. This is already validated by 3844 // the parser. 3845 assert(D.getIdentifier() == 0 && "Type name should have no identifier!"); 3846 3847 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 3848 QualType T = TInfo->getType(); 3849 if (D.isInvalidType()) 3850 return true; 3851 3852 // Make sure there are no unused decl attributes on the declarator. 3853 // We don't want to do this for ObjC parameters because we're going 3854 // to apply them to the actual parameter declaration. 3855 // Likewise, we don't want to do this for alias declarations, because 3856 // we are actually going to build a declaration from this eventually. 3857 if (D.getContext() != Declarator::ObjCParameterContext && 3858 D.getContext() != Declarator::AliasDeclContext && 3859 D.getContext() != Declarator::AliasTemplateContext) 3860 checkUnusedDeclAttributes(D); 3861 3862 if (getLangOpts().CPlusPlus) { 3863 // Check that there are no default arguments (C++ only). 3864 CheckExtraCXXDefaultArguments(D); 3865 } 3866 3867 return CreateParsedType(T, TInfo); 3868} 3869 3870ParsedType Sema::ActOnObjCInstanceType(SourceLocation Loc) { 3871 QualType T = Context.getObjCInstanceType(); 3872 TypeSourceInfo *TInfo = Context.getTrivialTypeSourceInfo(T, Loc); 3873 return CreateParsedType(T, TInfo); 3874} 3875 3876 3877//===----------------------------------------------------------------------===// 3878// Type Attribute Processing 3879//===----------------------------------------------------------------------===// 3880 3881/// HandleAddressSpaceTypeAttribute - Process an address_space attribute on the 3882/// specified type. The attribute contains 1 argument, the id of the address 3883/// space for the type. 3884static void HandleAddressSpaceTypeAttribute(QualType &Type, 3885 const AttributeList &Attr, Sema &S){ 3886 3887 // If this type is already address space qualified, reject it. 3888 // ISO/IEC TR 18037 S5.3 (amending C99 6.7.3): "No type shall be qualified by 3889 // qualifiers for two or more different address spaces." 3890 if (Type.getAddressSpace()) { 3891 S.Diag(Attr.getLoc(), diag::err_attribute_address_multiple_qualifiers); 3892 Attr.setInvalid(); 3893 return; 3894 } 3895 3896 // ISO/IEC TR 18037 S5.3 (amending C99 6.7.3): "A function type shall not be 3897 // qualified by an address-space qualifier." 3898 if (Type->isFunctionType()) { 3899 S.Diag(Attr.getLoc(), diag::err_attribute_address_function_type); 3900 Attr.setInvalid(); 3901 return; 3902 } 3903 3904 // Check the attribute arguments. 3905 if (Attr.getNumArgs() != 1) { 3906 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) 3907 << Attr.getName() << 1; 3908 Attr.setInvalid(); 3909 return; 3910 } 3911 Expr *ASArgExpr = static_cast<Expr *>(Attr.getArgAsExpr(0)); 3912 llvm::APSInt addrSpace(32); 3913 if (ASArgExpr->isTypeDependent() || ASArgExpr->isValueDependent() || 3914 !ASArgExpr->isIntegerConstantExpr(addrSpace, S.Context)) { 3915 S.Diag(Attr.getLoc(), diag::err_attribute_argument_type) 3916 << Attr.getName() << AANT_ArgumentIntegerConstant 3917 << ASArgExpr->getSourceRange(); 3918 Attr.setInvalid(); 3919 return; 3920 } 3921 3922 // Bounds checking. 3923 if (addrSpace.isSigned()) { 3924 if (addrSpace.isNegative()) { 3925 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_negative) 3926 << ASArgExpr->getSourceRange(); 3927 Attr.setInvalid(); 3928 return; 3929 } 3930 addrSpace.setIsSigned(false); 3931 } 3932 llvm::APSInt max(addrSpace.getBitWidth()); 3933 max = Qualifiers::MaxAddressSpace; 3934 if (addrSpace > max) { 3935 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_too_high) 3936 << int(Qualifiers::MaxAddressSpace) << ASArgExpr->getSourceRange(); 3937 Attr.setInvalid(); 3938 return; 3939 } 3940 3941 unsigned ASIdx = static_cast<unsigned>(addrSpace.getZExtValue()); 3942 Type = S.Context.getAddrSpaceQualType(Type, ASIdx); 3943} 3944 3945/// Does this type have a "direct" ownership qualifier? That is, 3946/// is it written like "__strong id", as opposed to something like 3947/// "typeof(foo)", where that happens to be strong? 3948static bool hasDirectOwnershipQualifier(QualType type) { 3949 // Fast path: no qualifier at all. 3950 assert(type.getQualifiers().hasObjCLifetime()); 3951 3952 while (true) { 3953 // __strong id 3954 if (const AttributedType *attr = dyn_cast<AttributedType>(type)) { 3955 if (attr->getAttrKind() == AttributedType::attr_objc_ownership) 3956 return true; 3957 3958 type = attr->getModifiedType(); 3959 3960 // X *__strong (...) 3961 } else if (const ParenType *paren = dyn_cast<ParenType>(type)) { 3962 type = paren->getInnerType(); 3963 3964 // That's it for things we want to complain about. In particular, 3965 // we do not want to look through typedefs, typeof(expr), 3966 // typeof(type), or any other way that the type is somehow 3967 // abstracted. 3968 } else { 3969 3970 return false; 3971 } 3972 } 3973} 3974 3975/// handleObjCOwnershipTypeAttr - Process an objc_ownership 3976/// attribute on the specified type. 3977/// 3978/// Returns 'true' if the attribute was handled. 3979static bool handleObjCOwnershipTypeAttr(TypeProcessingState &state, 3980 AttributeList &attr, 3981 QualType &type) { 3982 bool NonObjCPointer = false; 3983 3984 if (!type->isDependentType() && !type->isUndeducedType()) { 3985 if (const PointerType *ptr = type->getAs<PointerType>()) { 3986 QualType pointee = ptr->getPointeeType(); 3987 if (pointee->isObjCRetainableType() || pointee->isPointerType()) 3988 return false; 3989 // It is important not to lose the source info that there was an attribute 3990 // applied to non-objc pointer. We will create an attributed type but 3991 // its type will be the same as the original type. 3992 NonObjCPointer = true; 3993 } else if (!type->isObjCRetainableType()) { 3994 return false; 3995 } 3996 3997 // Don't accept an ownership attribute in the declspec if it would 3998 // just be the return type of a block pointer. 3999 if (state.isProcessingDeclSpec()) { 4000 Declarator &D = state.getDeclarator(); 4001 if (maybeMovePastReturnType(D, D.getNumTypeObjects())) 4002 return false; 4003 } 4004 } 4005 4006 Sema &S = state.getSema(); 4007 SourceLocation AttrLoc = attr.getLoc(); 4008 if (AttrLoc.isMacroID()) 4009 AttrLoc = S.getSourceManager().getImmediateExpansionRange(AttrLoc).first; 4010 4011 if (!attr.isArgIdent(0)) { 4012 S.Diag(AttrLoc, diag::err_attribute_argument_type) 4013 << attr.getName() << AANT_ArgumentString; 4014 attr.setInvalid(); 4015 return true; 4016 } 4017 4018 // Consume lifetime attributes without further comment outside of 4019 // ARC mode. 4020 if (!S.getLangOpts().ObjCAutoRefCount) 4021 return true; 4022 4023 IdentifierInfo *II = attr.getArgAsIdent(0)->Ident; 4024 Qualifiers::ObjCLifetime lifetime; 4025 if (II->isStr("none")) 4026 lifetime = Qualifiers::OCL_ExplicitNone; 4027 else if (II->isStr("strong")) 4028 lifetime = Qualifiers::OCL_Strong; 4029 else if (II->isStr("weak")) 4030 lifetime = Qualifiers::OCL_Weak; 4031 else if (II->isStr("autoreleasing")) 4032 lifetime = Qualifiers::OCL_Autoreleasing; 4033 else { 4034 S.Diag(AttrLoc, diag::warn_attribute_type_not_supported) 4035 << "objc_ownership" << II; 4036 attr.setInvalid(); 4037 return true; 4038 } 4039 4040 SplitQualType underlyingType = type.split(); 4041 4042 // Check for redundant/conflicting ownership qualifiers. 4043 if (Qualifiers::ObjCLifetime previousLifetime 4044 = type.getQualifiers().getObjCLifetime()) { 4045 // If it's written directly, that's an error. 4046 if (hasDirectOwnershipQualifier(type)) { 4047 S.Diag(AttrLoc, diag::err_attr_objc_ownership_redundant) 4048 << type; 4049 return true; 4050 } 4051 4052 // Otherwise, if the qualifiers actually conflict, pull sugar off 4053 // until we reach a type that is directly qualified. 4054 if (previousLifetime != lifetime) { 4055 // This should always terminate: the canonical type is 4056 // qualified, so some bit of sugar must be hiding it. 4057 while (!underlyingType.Quals.hasObjCLifetime()) { 4058 underlyingType = underlyingType.getSingleStepDesugaredType(); 4059 } 4060 underlyingType.Quals.removeObjCLifetime(); 4061 } 4062 } 4063 4064 underlyingType.Quals.addObjCLifetime(lifetime); 4065 4066 if (NonObjCPointer) { 4067 StringRef name = attr.getName()->getName(); 4068 switch (lifetime) { 4069 case Qualifiers::OCL_None: 4070 case Qualifiers::OCL_ExplicitNone: 4071 break; 4072 case Qualifiers::OCL_Strong: name = "__strong"; break; 4073 case Qualifiers::OCL_Weak: name = "__weak"; break; 4074 case Qualifiers::OCL_Autoreleasing: name = "__autoreleasing"; break; 4075 } 4076 S.Diag(AttrLoc, diag::warn_type_attribute_wrong_type) << name 4077 << TDS_ObjCObjOrBlock << type; 4078 } 4079 4080 QualType origType = type; 4081 if (!NonObjCPointer) 4082 type = S.Context.getQualifiedType(underlyingType); 4083 4084 // If we have a valid source location for the attribute, use an 4085 // AttributedType instead. 4086 if (AttrLoc.isValid()) 4087 type = S.Context.getAttributedType(AttributedType::attr_objc_ownership, 4088 origType, type); 4089 4090 // Forbid __weak if the runtime doesn't support it. 4091 if (lifetime == Qualifiers::OCL_Weak && 4092 !S.getLangOpts().ObjCARCWeak && !NonObjCPointer) { 4093 4094 // Actually, delay this until we know what we're parsing. 4095 if (S.DelayedDiagnostics.shouldDelayDiagnostics()) { 4096 S.DelayedDiagnostics.add( 4097 sema::DelayedDiagnostic::makeForbiddenType( 4098 S.getSourceManager().getExpansionLoc(AttrLoc), 4099 diag::err_arc_weak_no_runtime, type, /*ignored*/ 0)); 4100 } else { 4101 S.Diag(AttrLoc, diag::err_arc_weak_no_runtime); 4102 } 4103 4104 attr.setInvalid(); 4105 return true; 4106 } 4107 4108 // Forbid __weak for class objects marked as 4109 // objc_arc_weak_reference_unavailable 4110 if (lifetime == Qualifiers::OCL_Weak) { 4111 if (const ObjCObjectPointerType *ObjT = 4112 type->getAs<ObjCObjectPointerType>()) { 4113 if (ObjCInterfaceDecl *Class = ObjT->getInterfaceDecl()) { 4114 if (Class->isArcWeakrefUnavailable()) { 4115 S.Diag(AttrLoc, diag::err_arc_unsupported_weak_class); 4116 S.Diag(ObjT->getInterfaceDecl()->getLocation(), 4117 diag::note_class_declared); 4118 } 4119 } 4120 } 4121 } 4122 4123 return true; 4124} 4125 4126/// handleObjCGCTypeAttr - Process the __attribute__((objc_gc)) type 4127/// attribute on the specified type. Returns true to indicate that 4128/// the attribute was handled, false to indicate that the type does 4129/// not permit the attribute. 4130static bool handleObjCGCTypeAttr(TypeProcessingState &state, 4131 AttributeList &attr, 4132 QualType &type) { 4133 Sema &S = state.getSema(); 4134 4135 // Delay if this isn't some kind of pointer. 4136 if (!type->isPointerType() && 4137 !type->isObjCObjectPointerType() && 4138 !type->isBlockPointerType()) 4139 return false; 4140 4141 if (type.getObjCGCAttr() != Qualifiers::GCNone) { 4142 S.Diag(attr.getLoc(), diag::err_attribute_multiple_objc_gc); 4143 attr.setInvalid(); 4144 return true; 4145 } 4146 4147 // Check the attribute arguments. 4148 if (!attr.isArgIdent(0)) { 4149 S.Diag(attr.getLoc(), diag::err_attribute_argument_type) 4150 << attr.getName() << AANT_ArgumentString; 4151 attr.setInvalid(); 4152 return true; 4153 } 4154 Qualifiers::GC GCAttr; 4155 if (attr.getNumArgs() > 1) { 4156 S.Diag(attr.getLoc(), diag::err_attribute_wrong_number_arguments) 4157 << attr.getName() << 1; 4158 attr.setInvalid(); 4159 return true; 4160 } 4161 4162 IdentifierInfo *II = attr.getArgAsIdent(0)->Ident; 4163 if (II->isStr("weak")) 4164 GCAttr = Qualifiers::Weak; 4165 else if (II->isStr("strong")) 4166 GCAttr = Qualifiers::Strong; 4167 else { 4168 S.Diag(attr.getLoc(), diag::warn_attribute_type_not_supported) 4169 << "objc_gc" << II; 4170 attr.setInvalid(); 4171 return true; 4172 } 4173 4174 QualType origType = type; 4175 type = S.Context.getObjCGCQualType(origType, GCAttr); 4176 4177 // Make an attributed type to preserve the source information. 4178 if (attr.getLoc().isValid()) 4179 type = S.Context.getAttributedType(AttributedType::attr_objc_gc, 4180 origType, type); 4181 4182 return true; 4183} 4184 4185namespace { 4186 /// A helper class to unwrap a type down to a function for the 4187 /// purposes of applying attributes there. 4188 /// 4189 /// Use: 4190 /// FunctionTypeUnwrapper unwrapped(SemaRef, T); 4191 /// if (unwrapped.isFunctionType()) { 4192 /// const FunctionType *fn = unwrapped.get(); 4193 /// // change fn somehow 4194 /// T = unwrapped.wrap(fn); 4195 /// } 4196 struct FunctionTypeUnwrapper { 4197 enum WrapKind { 4198 Desugar, 4199 Parens, 4200 Pointer, 4201 BlockPointer, 4202 Reference, 4203 MemberPointer 4204 }; 4205 4206 QualType Original; 4207 const FunctionType *Fn; 4208 SmallVector<unsigned char /*WrapKind*/, 8> Stack; 4209 4210 FunctionTypeUnwrapper(Sema &S, QualType T) : Original(T) { 4211 while (true) { 4212 const Type *Ty = T.getTypePtr(); 4213 if (isa<FunctionType>(Ty)) { 4214 Fn = cast<FunctionType>(Ty); 4215 return; 4216 } else if (isa<ParenType>(Ty)) { 4217 T = cast<ParenType>(Ty)->getInnerType(); 4218 Stack.push_back(Parens); 4219 } else if (isa<PointerType>(Ty)) { 4220 T = cast<PointerType>(Ty)->getPointeeType(); 4221 Stack.push_back(Pointer); 4222 } else if (isa<BlockPointerType>(Ty)) { 4223 T = cast<BlockPointerType>(Ty)->getPointeeType(); 4224 Stack.push_back(BlockPointer); 4225 } else if (isa<MemberPointerType>(Ty)) { 4226 T = cast<MemberPointerType>(Ty)->getPointeeType(); 4227 Stack.push_back(MemberPointer); 4228 } else if (isa<ReferenceType>(Ty)) { 4229 T = cast<ReferenceType>(Ty)->getPointeeType(); 4230 Stack.push_back(Reference); 4231 } else { 4232 const Type *DTy = Ty->getUnqualifiedDesugaredType(); 4233 if (Ty == DTy) { 4234 Fn = 0; 4235 return; 4236 } 4237 4238 T = QualType(DTy, 0); 4239 Stack.push_back(Desugar); 4240 } 4241 } 4242 } 4243 4244 bool isFunctionType() const { return (Fn != 0); } 4245 const FunctionType *get() const { return Fn; } 4246 4247 QualType wrap(Sema &S, const FunctionType *New) { 4248 // If T wasn't modified from the unwrapped type, do nothing. 4249 if (New == get()) return Original; 4250 4251 Fn = New; 4252 return wrap(S.Context, Original, 0); 4253 } 4254 4255 private: 4256 QualType wrap(ASTContext &C, QualType Old, unsigned I) { 4257 if (I == Stack.size()) 4258 return C.getQualifiedType(Fn, Old.getQualifiers()); 4259 4260 // Build up the inner type, applying the qualifiers from the old 4261 // type to the new type. 4262 SplitQualType SplitOld = Old.split(); 4263 4264 // As a special case, tail-recurse if there are no qualifiers. 4265 if (SplitOld.Quals.empty()) 4266 return wrap(C, SplitOld.Ty, I); 4267 return C.getQualifiedType(wrap(C, SplitOld.Ty, I), SplitOld.Quals); 4268 } 4269 4270 QualType wrap(ASTContext &C, const Type *Old, unsigned I) { 4271 if (I == Stack.size()) return QualType(Fn, 0); 4272 4273 switch (static_cast<WrapKind>(Stack[I++])) { 4274 case Desugar: 4275 // This is the point at which we potentially lose source 4276 // information. 4277 return wrap(C, Old->getUnqualifiedDesugaredType(), I); 4278 4279 case Parens: { 4280 QualType New = wrap(C, cast<ParenType>(Old)->getInnerType(), I); 4281 return C.getParenType(New); 4282 } 4283 4284 case Pointer: { 4285 QualType New = wrap(C, cast<PointerType>(Old)->getPointeeType(), I); 4286 return C.getPointerType(New); 4287 } 4288 4289 case BlockPointer: { 4290 QualType New = wrap(C, cast<BlockPointerType>(Old)->getPointeeType(),I); 4291 return C.getBlockPointerType(New); 4292 } 4293 4294 case MemberPointer: { 4295 const MemberPointerType *OldMPT = cast<MemberPointerType>(Old); 4296 QualType New = wrap(C, OldMPT->getPointeeType(), I); 4297 return C.getMemberPointerType(New, OldMPT->getClass()); 4298 } 4299 4300 case Reference: { 4301 const ReferenceType *OldRef = cast<ReferenceType>(Old); 4302 QualType New = wrap(C, OldRef->getPointeeType(), I); 4303 if (isa<LValueReferenceType>(OldRef)) 4304 return C.getLValueReferenceType(New, OldRef->isSpelledAsLValue()); 4305 else 4306 return C.getRValueReferenceType(New); 4307 } 4308 } 4309 4310 llvm_unreachable("unknown wrapping kind"); 4311 } 4312 }; 4313} 4314 4315static bool handleMSPointerTypeQualifierAttr(TypeProcessingState &State, 4316 AttributeList &Attr, 4317 QualType &Type) { 4318 Sema &S = State.getSema(); 4319 4320 AttributeList::Kind Kind = Attr.getKind(); 4321 QualType Desugared = Type; 4322 const AttributedType *AT = dyn_cast<AttributedType>(Type); 4323 while (AT) { 4324 AttributedType::Kind CurAttrKind = AT->getAttrKind(); 4325 4326 // You cannot specify duplicate type attributes, so if the attribute has 4327 // already been applied, flag it. 4328 if (getAttrListKind(CurAttrKind) == Kind) { 4329 S.Diag(Attr.getLoc(), diag::warn_duplicate_attribute_exact) 4330 << Attr.getName(); 4331 return true; 4332 } 4333 4334 // You cannot have both __sptr and __uptr on the same type, nor can you 4335 // have __ptr32 and __ptr64. 4336 if ((CurAttrKind == AttributedType::attr_ptr32 && 4337 Kind == AttributeList::AT_Ptr64) || 4338 (CurAttrKind == AttributedType::attr_ptr64 && 4339 Kind == AttributeList::AT_Ptr32)) { 4340 S.Diag(Attr.getLoc(), diag::err_attributes_are_not_compatible) 4341 << "'__ptr32'" << "'__ptr64'"; 4342 return true; 4343 } else if ((CurAttrKind == AttributedType::attr_sptr && 4344 Kind == AttributeList::AT_UPtr) || 4345 (CurAttrKind == AttributedType::attr_uptr && 4346 Kind == AttributeList::AT_SPtr)) { 4347 S.Diag(Attr.getLoc(), diag::err_attributes_are_not_compatible) 4348 << "'__sptr'" << "'__uptr'"; 4349 return true; 4350 } 4351 4352 Desugared = AT->getEquivalentType(); 4353 AT = dyn_cast<AttributedType>(Desugared); 4354 } 4355 4356 // Pointer type qualifiers can only operate on pointer types, but not 4357 // pointer-to-member types. 4358 if (!isa<PointerType>(Desugared)) { 4359 S.Diag(Attr.getLoc(), Type->isMemberPointerType() ? 4360 diag::err_attribute_no_member_pointers : 4361 diag::err_attribute_pointers_only) << Attr.getName(); 4362 return true; 4363 } 4364 4365 AttributedType::Kind TAK; 4366 switch (Kind) { 4367 default: llvm_unreachable("Unknown attribute kind"); 4368 case AttributeList::AT_Ptr32: TAK = AttributedType::attr_ptr32; break; 4369 case AttributeList::AT_Ptr64: TAK = AttributedType::attr_ptr64; break; 4370 case AttributeList::AT_SPtr: TAK = AttributedType::attr_sptr; break; 4371 case AttributeList::AT_UPtr: TAK = AttributedType::attr_uptr; break; 4372 } 4373 4374 Type = S.Context.getAttributedType(TAK, Type, Type); 4375 return false; 4376} 4377 4378static AttributedType::Kind getCCTypeAttrKind(AttributeList &Attr) { 4379 assert(!Attr.isInvalid()); 4380 switch (Attr.getKind()) { 4381 default: 4382 llvm_unreachable("not a calling convention attribute"); 4383 case AttributeList::AT_CDecl: 4384 return AttributedType::attr_cdecl; 4385 case AttributeList::AT_FastCall: 4386 return AttributedType::attr_fastcall; 4387 case AttributeList::AT_StdCall: 4388 return AttributedType::attr_stdcall; 4389 case AttributeList::AT_ThisCall: 4390 return AttributedType::attr_thiscall; 4391 case AttributeList::AT_Pascal: 4392 return AttributedType::attr_pascal; 4393 case AttributeList::AT_Pcs: { 4394 // We know attr is valid so it can only have one of two strings args. 4395 StringLiteral *Str = cast<StringLiteral>(Attr.getArgAsExpr(0)); 4396 return llvm::StringSwitch<AttributedType::Kind>(Str->getString()) 4397 .Case("aapcs", AttributedType::attr_pcs) 4398 .Case("aapcs-vfp", AttributedType::attr_pcs_vfp); 4399 } 4400 case AttributeList::AT_PnaclCall: 4401 return AttributedType::attr_pnaclcall; 4402 case AttributeList::AT_IntelOclBicc: 4403 return AttributedType::attr_inteloclbicc; 4404 case AttributeList::AT_MSABI: 4405 return AttributedType::attr_ms_abi; 4406 case AttributeList::AT_SysVABI: 4407 return AttributedType::attr_sysv_abi; 4408 } 4409 llvm_unreachable("unexpected attribute kind!"); 4410} 4411 4412/// Process an individual function attribute. Returns true to 4413/// indicate that the attribute was handled, false if it wasn't. 4414static bool handleFunctionTypeAttr(TypeProcessingState &state, 4415 AttributeList &attr, 4416 QualType &type) { 4417 Sema &S = state.getSema(); 4418 4419 FunctionTypeUnwrapper unwrapped(S, type); 4420 4421 if (attr.getKind() == AttributeList::AT_NoReturn) { 4422 if (S.CheckNoReturnAttr(attr)) 4423 return true; 4424 4425 // Delay if this is not a function type. 4426 if (!unwrapped.isFunctionType()) 4427 return false; 4428 4429 // Otherwise we can process right away. 4430 FunctionType::ExtInfo EI = unwrapped.get()->getExtInfo().withNoReturn(true); 4431 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 4432 return true; 4433 } 4434 4435 // ns_returns_retained is not always a type attribute, but if we got 4436 // here, we're treating it as one right now. 4437 if (attr.getKind() == AttributeList::AT_NSReturnsRetained) { 4438 assert(S.getLangOpts().ObjCAutoRefCount && 4439 "ns_returns_retained treated as type attribute in non-ARC"); 4440 if (attr.getNumArgs()) return true; 4441 4442 // Delay if this is not a function type. 4443 if (!unwrapped.isFunctionType()) 4444 return false; 4445 4446 FunctionType::ExtInfo EI 4447 = unwrapped.get()->getExtInfo().withProducesResult(true); 4448 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 4449 return true; 4450 } 4451 4452 if (attr.getKind() == AttributeList::AT_Regparm) { 4453 unsigned value; 4454 if (S.CheckRegparmAttr(attr, value)) 4455 return true; 4456 4457 // Delay if this is not a function type. 4458 if (!unwrapped.isFunctionType()) 4459 return false; 4460 4461 // Diagnose regparm with fastcall. 4462 const FunctionType *fn = unwrapped.get(); 4463 CallingConv CC = fn->getCallConv(); 4464 if (CC == CC_X86FastCall) { 4465 S.Diag(attr.getLoc(), diag::err_attributes_are_not_compatible) 4466 << FunctionType::getNameForCallConv(CC) 4467 << "regparm"; 4468 attr.setInvalid(); 4469 return true; 4470 } 4471 4472 FunctionType::ExtInfo EI = 4473 unwrapped.get()->getExtInfo().withRegParm(value); 4474 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 4475 return true; 4476 } 4477 4478 // Delay if the type didn't work out to a function. 4479 if (!unwrapped.isFunctionType()) return false; 4480 4481 // Otherwise, a calling convention. 4482 CallingConv CC; 4483 if (S.CheckCallingConvAttr(attr, CC)) 4484 return true; 4485 4486 const FunctionType *fn = unwrapped.get(); 4487 CallingConv CCOld = fn->getCallConv(); 4488 AttributedType::Kind CCAttrKind = getCCTypeAttrKind(attr); 4489 4490 if (CCOld != CC) { 4491 // Error out on when there's already an attribute on the type 4492 // and the CCs don't match. 4493 const AttributedType *AT = S.getCallingConvAttributedType(type); 4494 if (AT && AT->getAttrKind() != CCAttrKind) { 4495 S.Diag(attr.getLoc(), diag::err_attributes_are_not_compatible) 4496 << FunctionType::getNameForCallConv(CC) 4497 << FunctionType::getNameForCallConv(CCOld); 4498 attr.setInvalid(); 4499 return true; 4500 } 4501 } 4502 4503 // Diagnose the use of X86 fastcall on varargs or unprototyped functions. 4504 if (CC == CC_X86FastCall) { 4505 if (isa<FunctionNoProtoType>(fn)) { 4506 S.Diag(attr.getLoc(), diag::err_cconv_knr) 4507 << FunctionType::getNameForCallConv(CC); 4508 attr.setInvalid(); 4509 return true; 4510 } 4511 4512 const FunctionProtoType *FnP = cast<FunctionProtoType>(fn); 4513 if (FnP->isVariadic()) { 4514 S.Diag(attr.getLoc(), diag::err_cconv_varargs) 4515 << FunctionType::getNameForCallConv(CC); 4516 attr.setInvalid(); 4517 return true; 4518 } 4519 4520 // Also diagnose fastcall with regparm. 4521 if (fn->getHasRegParm()) { 4522 S.Diag(attr.getLoc(), diag::err_attributes_are_not_compatible) 4523 << "regparm" 4524 << FunctionType::getNameForCallConv(CC); 4525 attr.setInvalid(); 4526 return true; 4527 } 4528 } 4529 4530 // Modify the CC from the wrapped function type, wrap it all back, and then 4531 // wrap the whole thing in an AttributedType as written. The modified type 4532 // might have a different CC if we ignored the attribute. 4533 FunctionType::ExtInfo EI = unwrapped.get()->getExtInfo().withCallingConv(CC); 4534 QualType Equivalent = 4535 unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 4536 type = S.Context.getAttributedType(CCAttrKind, type, Equivalent); 4537 return true; 4538} 4539 4540void Sema::adjustMemberFunctionCC(QualType &T) { 4541 const FunctionType *FT = T->castAs<FunctionType>(); 4542 bool IsVariadic = (isa<FunctionProtoType>(FT) && 4543 cast<FunctionProtoType>(FT)->isVariadic()); 4544 CallingConv CC = FT->getCallConv(); 4545 CallingConv DefaultCC = 4546 Context.getDefaultCallingConvention(IsVariadic, /*IsCXXMethod=*/false); 4547 if (CC != DefaultCC) 4548 return; 4549 4550 // Check if there was an explicit attribute, but only look through parens. 4551 // The intent is to look for an attribute on the current declarator, but not 4552 // one that came from a typedef. 4553 QualType R = T.IgnoreParens(); 4554 while (const AttributedType *AT = dyn_cast<AttributedType>(R)) { 4555 if (AT->isCallingConv()) 4556 return; 4557 R = AT->getModifiedType().IgnoreParens(); 4558 } 4559 4560 // FIXME: This loses sugar. This should probably be fixed with an implicit 4561 // AttributedType node that adjusts the convention. 4562 CC = Context.getDefaultCallingConvention(IsVariadic, /*IsCXXMethod=*/true); 4563 FT = Context.adjustFunctionType(FT, FT->getExtInfo().withCallingConv(CC)); 4564 FunctionTypeUnwrapper Unwrapped(*this, T); 4565 T = Unwrapped.wrap(*this, FT); 4566} 4567 4568/// Handle OpenCL image access qualifiers: read_only, write_only, read_write 4569static void HandleOpenCLImageAccessAttribute(QualType& CurType, 4570 const AttributeList &Attr, 4571 Sema &S) { 4572 // Check the attribute arguments. 4573 if (Attr.getNumArgs() != 1) { 4574 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) 4575 << Attr.getName() << 1; 4576 Attr.setInvalid(); 4577 return; 4578 } 4579 Expr *sizeExpr = static_cast<Expr *>(Attr.getArgAsExpr(0)); 4580 llvm::APSInt arg(32); 4581 if (sizeExpr->isTypeDependent() || sizeExpr->isValueDependent() || 4582 !sizeExpr->isIntegerConstantExpr(arg, S.Context)) { 4583 S.Diag(Attr.getLoc(), diag::err_attribute_argument_type) 4584 << Attr.getName() << AANT_ArgumentIntegerConstant 4585 << sizeExpr->getSourceRange(); 4586 Attr.setInvalid(); 4587 return; 4588 } 4589 unsigned iarg = static_cast<unsigned>(arg.getZExtValue()); 4590 switch (iarg) { 4591 case CLIA_read_only: 4592 case CLIA_write_only: 4593 case CLIA_read_write: 4594 // Implemented in a separate patch 4595 break; 4596 default: 4597 // Implemented in a separate patch 4598 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_size) 4599 << sizeExpr->getSourceRange(); 4600 Attr.setInvalid(); 4601 break; 4602 } 4603} 4604 4605/// HandleVectorSizeAttribute - this attribute is only applicable to integral 4606/// and float scalars, although arrays, pointers, and function return values are 4607/// allowed in conjunction with this construct. Aggregates with this attribute 4608/// are invalid, even if they are of the same size as a corresponding scalar. 4609/// The raw attribute should contain precisely 1 argument, the vector size for 4610/// the variable, measured in bytes. If curType and rawAttr are well formed, 4611/// this routine will return a new vector type. 4612static void HandleVectorSizeAttr(QualType& CurType, const AttributeList &Attr, 4613 Sema &S) { 4614 // Check the attribute arguments. 4615 if (Attr.getNumArgs() != 1) { 4616 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) 4617 << Attr.getName() << 1; 4618 Attr.setInvalid(); 4619 return; 4620 } 4621 Expr *sizeExpr = static_cast<Expr *>(Attr.getArgAsExpr(0)); 4622 llvm::APSInt vecSize(32); 4623 if (sizeExpr->isTypeDependent() || sizeExpr->isValueDependent() || 4624 !sizeExpr->isIntegerConstantExpr(vecSize, S.Context)) { 4625 S.Diag(Attr.getLoc(), diag::err_attribute_argument_type) 4626 << Attr.getName() << AANT_ArgumentIntegerConstant 4627 << sizeExpr->getSourceRange(); 4628 Attr.setInvalid(); 4629 return; 4630 } 4631 // the base type must be integer or float, and can't already be a vector. 4632 if (!CurType->isBuiltinType() || 4633 (!CurType->isIntegerType() && !CurType->isRealFloatingType())) { 4634 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_vector_type) << CurType; 4635 Attr.setInvalid(); 4636 return; 4637 } 4638 unsigned typeSize = static_cast<unsigned>(S.Context.getTypeSize(CurType)); 4639 // vecSize is specified in bytes - convert to bits. 4640 unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue() * 8); 4641 4642 // the vector size needs to be an integral multiple of the type size. 4643 if (vectorSize % typeSize) { 4644 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_size) 4645 << sizeExpr->getSourceRange(); 4646 Attr.setInvalid(); 4647 return; 4648 } 4649 if (VectorType::isVectorSizeTooLarge(vectorSize / typeSize)) { 4650 S.Diag(Attr.getLoc(), diag::err_attribute_size_too_large) 4651 << sizeExpr->getSourceRange(); 4652 Attr.setInvalid(); 4653 return; 4654 } 4655 if (vectorSize == 0) { 4656 S.Diag(Attr.getLoc(), diag::err_attribute_zero_size) 4657 << sizeExpr->getSourceRange(); 4658 Attr.setInvalid(); 4659 return; 4660 } 4661 4662 // Success! Instantiate the vector type, the number of elements is > 0, and 4663 // not required to be a power of 2, unlike GCC. 4664 CurType = S.Context.getVectorType(CurType, vectorSize/typeSize, 4665 VectorType::GenericVector); 4666} 4667 4668/// \brief Process the OpenCL-like ext_vector_type attribute when it occurs on 4669/// a type. 4670static void HandleExtVectorTypeAttr(QualType &CurType, 4671 const AttributeList &Attr, 4672 Sema &S) { 4673 // check the attribute arguments. 4674 if (Attr.getNumArgs() != 1) { 4675 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) 4676 << Attr.getName() << 1; 4677 return; 4678 } 4679 4680 Expr *sizeExpr; 4681 4682 // Special case where the argument is a template id. 4683 if (Attr.isArgIdent(0)) { 4684 CXXScopeSpec SS; 4685 SourceLocation TemplateKWLoc; 4686 UnqualifiedId id; 4687 id.setIdentifier(Attr.getArgAsIdent(0)->Ident, Attr.getLoc()); 4688 4689 ExprResult Size = S.ActOnIdExpression(S.getCurScope(), SS, TemplateKWLoc, 4690 id, false, false); 4691 if (Size.isInvalid()) 4692 return; 4693 4694 sizeExpr = Size.get(); 4695 } else { 4696 sizeExpr = Attr.getArgAsExpr(0); 4697 } 4698 4699 // Create the vector type. 4700 QualType T = S.BuildExtVectorType(CurType, sizeExpr, Attr.getLoc()); 4701 if (!T.isNull()) 4702 CurType = T; 4703} 4704 4705static bool isPermittedNeonBaseType(QualType &Ty, 4706 VectorType::VectorKind VecKind, 4707 bool IsAArch64) { 4708 const BuiltinType *BTy = Ty->getAs<BuiltinType>(); 4709 if (!BTy) 4710 return false; 4711 4712 if (VecKind == VectorType::NeonPolyVector) { 4713 if (IsAArch64) { 4714 // AArch64 polynomial vectors are unsigned 4715 return BTy->getKind() == BuiltinType::UChar || 4716 BTy->getKind() == BuiltinType::UShort; 4717 } else { 4718 // AArch32 polynomial vector are signed. 4719 return BTy->getKind() == BuiltinType::SChar || 4720 BTy->getKind() == BuiltinType::Short; 4721 } 4722 } 4723 4724 // Non-polynomial vector types: the usual suspects are allowed, as well as 4725 // float64_t on AArch64. 4726 if (IsAArch64 && BTy->getKind() == BuiltinType::Double) 4727 return true; 4728 4729 return BTy->getKind() == BuiltinType::SChar || 4730 BTy->getKind() == BuiltinType::UChar || 4731 BTy->getKind() == BuiltinType::Short || 4732 BTy->getKind() == BuiltinType::UShort || 4733 BTy->getKind() == BuiltinType::Int || 4734 BTy->getKind() == BuiltinType::UInt || 4735 BTy->getKind() == BuiltinType::LongLong || 4736 BTy->getKind() == BuiltinType::ULongLong || 4737 BTy->getKind() == BuiltinType::Float || 4738 BTy->getKind() == BuiltinType::Half; 4739} 4740 4741/// HandleNeonVectorTypeAttr - The "neon_vector_type" and 4742/// "neon_polyvector_type" attributes are used to create vector types that 4743/// are mangled according to ARM's ABI. Otherwise, these types are identical 4744/// to those created with the "vector_size" attribute. Unlike "vector_size" 4745/// the argument to these Neon attributes is the number of vector elements, 4746/// not the vector size in bytes. The vector width and element type must 4747/// match one of the standard Neon vector types. 4748static void HandleNeonVectorTypeAttr(QualType& CurType, 4749 const AttributeList &Attr, Sema &S, 4750 VectorType::VectorKind VecKind) { 4751 // Check the attribute arguments. 4752 if (Attr.getNumArgs() != 1) { 4753 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) 4754 << Attr.getName() << 1; 4755 Attr.setInvalid(); 4756 return; 4757 } 4758 // The number of elements must be an ICE. 4759 Expr *numEltsExpr = static_cast<Expr *>(Attr.getArgAsExpr(0)); 4760 llvm::APSInt numEltsInt(32); 4761 if (numEltsExpr->isTypeDependent() || numEltsExpr->isValueDependent() || 4762 !numEltsExpr->isIntegerConstantExpr(numEltsInt, S.Context)) { 4763 S.Diag(Attr.getLoc(), diag::err_attribute_argument_type) 4764 << Attr.getName() << AANT_ArgumentIntegerConstant 4765 << numEltsExpr->getSourceRange(); 4766 Attr.setInvalid(); 4767 return; 4768 } 4769 // Only certain element types are supported for Neon vectors. 4770 llvm::Triple::ArchType Arch = 4771 S.Context.getTargetInfo().getTriple().getArch(); 4772 if (!isPermittedNeonBaseType(CurType, VecKind, 4773 Arch == llvm::Triple::aarch64)) { 4774 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_vector_type) << CurType; 4775 Attr.setInvalid(); 4776 return; 4777 } 4778 4779 // The total size of the vector must be 64 or 128 bits. 4780 unsigned typeSize = static_cast<unsigned>(S.Context.getTypeSize(CurType)); 4781 unsigned numElts = static_cast<unsigned>(numEltsInt.getZExtValue()); 4782 unsigned vecSize = typeSize * numElts; 4783 if (vecSize != 64 && vecSize != 128) { 4784 S.Diag(Attr.getLoc(), diag::err_attribute_bad_neon_vector_size) << CurType; 4785 Attr.setInvalid(); 4786 return; 4787 } 4788 4789 CurType = S.Context.getVectorType(CurType, numElts, VecKind); 4790} 4791 4792static void processTypeAttrs(TypeProcessingState &state, QualType &type, 4793 TypeAttrLocation TAL, AttributeList *attrs) { 4794 // Scan through and apply attributes to this type where it makes sense. Some 4795 // attributes (such as __address_space__, __vector_size__, etc) apply to the 4796 // type, but others can be present in the type specifiers even though they 4797 // apply to the decl. Here we apply type attributes and ignore the rest. 4798 4799 AttributeList *next; 4800 do { 4801 AttributeList &attr = *attrs; 4802 next = attr.getNext(); 4803 4804 // Skip attributes that were marked to be invalid. 4805 if (attr.isInvalid()) 4806 continue; 4807 4808 if (attr.isCXX11Attribute()) { 4809 // [[gnu::...]] attributes are treated as declaration attributes, so may 4810 // not appertain to a DeclaratorChunk, even if we handle them as type 4811 // attributes. 4812 if (attr.getScopeName() && attr.getScopeName()->isStr("gnu")) { 4813 if (TAL == TAL_DeclChunk) { 4814 state.getSema().Diag(attr.getLoc(), 4815 diag::warn_cxx11_gnu_attribute_on_type) 4816 << attr.getName(); 4817 continue; 4818 } 4819 } else if (TAL != TAL_DeclChunk) { 4820 // Otherwise, only consider type processing for a C++11 attribute if 4821 // it's actually been applied to a type. 4822 continue; 4823 } 4824 } 4825 4826 // If this is an attribute we can handle, do so now, 4827 // otherwise, add it to the FnAttrs list for rechaining. 4828 switch (attr.getKind()) { 4829 default: 4830 // A C++11 attribute on a declarator chunk must appertain to a type. 4831 if (attr.isCXX11Attribute() && TAL == TAL_DeclChunk) { 4832 state.getSema().Diag(attr.getLoc(), diag::err_attribute_not_type_attr) 4833 << attr.getName(); 4834 attr.setUsedAsTypeAttr(); 4835 } 4836 break; 4837 4838 case AttributeList::UnknownAttribute: 4839 if (attr.isCXX11Attribute() && TAL == TAL_DeclChunk) 4840 state.getSema().Diag(attr.getLoc(), 4841 diag::warn_unknown_attribute_ignored) 4842 << attr.getName(); 4843 break; 4844 4845 case AttributeList::IgnoredAttribute: 4846 break; 4847 4848 case AttributeList::AT_MayAlias: 4849 // FIXME: This attribute needs to actually be handled, but if we ignore 4850 // it it breaks large amounts of Linux software. 4851 attr.setUsedAsTypeAttr(); 4852 break; 4853 case AttributeList::AT_AddressSpace: 4854 HandleAddressSpaceTypeAttribute(type, attr, state.getSema()); 4855 attr.setUsedAsTypeAttr(); 4856 break; 4857 OBJC_POINTER_TYPE_ATTRS_CASELIST: 4858 if (!handleObjCPointerTypeAttr(state, attr, type)) 4859 distributeObjCPointerTypeAttr(state, attr, type); 4860 attr.setUsedAsTypeAttr(); 4861 break; 4862 case AttributeList::AT_VectorSize: 4863 HandleVectorSizeAttr(type, attr, state.getSema()); 4864 attr.setUsedAsTypeAttr(); 4865 break; 4866 case AttributeList::AT_ExtVectorType: 4867 HandleExtVectorTypeAttr(type, attr, state.getSema()); 4868 attr.setUsedAsTypeAttr(); 4869 break; 4870 case AttributeList::AT_NeonVectorType: 4871 HandleNeonVectorTypeAttr(type, attr, state.getSema(), 4872 VectorType::NeonVector); 4873 attr.setUsedAsTypeAttr(); 4874 break; 4875 case AttributeList::AT_NeonPolyVectorType: 4876 HandleNeonVectorTypeAttr(type, attr, state.getSema(), 4877 VectorType::NeonPolyVector); 4878 attr.setUsedAsTypeAttr(); 4879 break; 4880 case AttributeList::AT_OpenCLImageAccess: 4881 HandleOpenCLImageAccessAttribute(type, attr, state.getSema()); 4882 attr.setUsedAsTypeAttr(); 4883 break; 4884 4885 case AttributeList::AT_Win64: 4886 attr.setUsedAsTypeAttr(); 4887 break; 4888 MS_TYPE_ATTRS_CASELIST: 4889 if (!handleMSPointerTypeQualifierAttr(state, attr, type)) 4890 attr.setUsedAsTypeAttr(); 4891 break; 4892 4893 case AttributeList::AT_NSReturnsRetained: 4894 if (!state.getSema().getLangOpts().ObjCAutoRefCount) 4895 break; 4896 // fallthrough into the function attrs 4897 4898 FUNCTION_TYPE_ATTRS_CASELIST: 4899 attr.setUsedAsTypeAttr(); 4900 4901 // Never process function type attributes as part of the 4902 // declaration-specifiers. 4903 if (TAL == TAL_DeclSpec) 4904 distributeFunctionTypeAttrFromDeclSpec(state, attr, type); 4905 4906 // Otherwise, handle the possible delays. 4907 else if (!handleFunctionTypeAttr(state, attr, type)) 4908 distributeFunctionTypeAttr(state, attr, type); 4909 break; 4910 } 4911 } while ((attrs = next)); 4912} 4913 4914/// \brief Ensure that the type of the given expression is complete. 4915/// 4916/// This routine checks whether the expression \p E has a complete type. If the 4917/// expression refers to an instantiable construct, that instantiation is 4918/// performed as needed to complete its type. Furthermore 4919/// Sema::RequireCompleteType is called for the expression's type (or in the 4920/// case of a reference type, the referred-to type). 4921/// 4922/// \param E The expression whose type is required to be complete. 4923/// \param Diagnoser The object that will emit a diagnostic if the type is 4924/// incomplete. 4925/// 4926/// \returns \c true if the type of \p E is incomplete and diagnosed, \c false 4927/// otherwise. 4928bool Sema::RequireCompleteExprType(Expr *E, TypeDiagnoser &Diagnoser){ 4929 QualType T = E->getType(); 4930 4931 // Fast path the case where the type is already complete. 4932 if (!T->isIncompleteType()) 4933 // FIXME: The definition might not be visible. 4934 return false; 4935 4936 // Incomplete array types may be completed by the initializer attached to 4937 // their definitions. For static data members of class templates we need to 4938 // instantiate the definition to get this initializer and complete the type. 4939 if (T->isIncompleteArrayType()) { 4940 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E->IgnoreParens())) { 4941 if (VarDecl *Var = dyn_cast<VarDecl>(DRE->getDecl())) { 4942 if (Var->isStaticDataMember() && 4943 Var->getInstantiatedFromStaticDataMember()) { 4944 4945 MemberSpecializationInfo *MSInfo = Var->getMemberSpecializationInfo(); 4946 assert(MSInfo && "Missing member specialization information?"); 4947 if (MSInfo->getTemplateSpecializationKind() 4948 != TSK_ExplicitSpecialization) { 4949 // If we don't already have a point of instantiation, this is it. 4950 if (MSInfo->getPointOfInstantiation().isInvalid()) { 4951 MSInfo->setPointOfInstantiation(E->getLocStart()); 4952 4953 // This is a modification of an existing AST node. Notify 4954 // listeners. 4955 if (ASTMutationListener *L = getASTMutationListener()) 4956 L->StaticDataMemberInstantiated(Var); 4957 } 4958 4959 InstantiateStaticDataMemberDefinition(E->getExprLoc(), Var); 4960 4961 // Update the type to the newly instantiated definition's type both 4962 // here and within the expression. 4963 if (VarDecl *Def = Var->getDefinition()) { 4964 DRE->setDecl(Def); 4965 T = Def->getType(); 4966 DRE->setType(T); 4967 E->setType(T); 4968 } 4969 } 4970 4971 // We still go on to try to complete the type independently, as it 4972 // may also require instantiations or diagnostics if it remains 4973 // incomplete. 4974 } 4975 } 4976 } 4977 } 4978 4979 // FIXME: Are there other cases which require instantiating something other 4980 // than the type to complete the type of an expression? 4981 4982 // Look through reference types and complete the referred type. 4983 if (const ReferenceType *Ref = T->getAs<ReferenceType>()) 4984 T = Ref->getPointeeType(); 4985 4986 return RequireCompleteType(E->getExprLoc(), T, Diagnoser); 4987} 4988 4989namespace { 4990 struct TypeDiagnoserDiag : Sema::TypeDiagnoser { 4991 unsigned DiagID; 4992 4993 TypeDiagnoserDiag(unsigned DiagID) 4994 : Sema::TypeDiagnoser(DiagID == 0), DiagID(DiagID) {} 4995 4996 virtual void diagnose(Sema &S, SourceLocation Loc, QualType T) { 4997 if (Suppressed) return; 4998 S.Diag(Loc, DiagID) << T; 4999 } 5000 }; 5001} 5002 5003bool Sema::RequireCompleteExprType(Expr *E, unsigned DiagID) { 5004 TypeDiagnoserDiag Diagnoser(DiagID); 5005 return RequireCompleteExprType(E, Diagnoser); 5006} 5007 5008/// @brief Ensure that the type T is a complete type. 5009/// 5010/// This routine checks whether the type @p T is complete in any 5011/// context where a complete type is required. If @p T is a complete 5012/// type, returns false. If @p T is a class template specialization, 5013/// this routine then attempts to perform class template 5014/// instantiation. If instantiation fails, or if @p T is incomplete 5015/// and cannot be completed, issues the diagnostic @p diag (giving it 5016/// the type @p T) and returns true. 5017/// 5018/// @param Loc The location in the source that the incomplete type 5019/// diagnostic should refer to. 5020/// 5021/// @param T The type that this routine is examining for completeness. 5022/// 5023/// @returns @c true if @p T is incomplete and a diagnostic was emitted, 5024/// @c false otherwise. 5025bool Sema::RequireCompleteType(SourceLocation Loc, QualType T, 5026 TypeDiagnoser &Diagnoser) { 5027 if (RequireCompleteTypeImpl(Loc, T, Diagnoser)) 5028 return true; 5029 if (const TagType *Tag = T->getAs<TagType>()) { 5030 if (!Tag->getDecl()->isCompleteDefinitionRequired()) { 5031 Tag->getDecl()->setCompleteDefinitionRequired(); 5032 Consumer.HandleTagDeclRequiredDefinition(Tag->getDecl()); 5033 } 5034 } 5035 return false; 5036} 5037 5038/// \brief The implementation of RequireCompleteType 5039bool Sema::RequireCompleteTypeImpl(SourceLocation Loc, QualType T, 5040 TypeDiagnoser &Diagnoser) { 5041 // FIXME: Add this assertion to make sure we always get instantiation points. 5042 // assert(!Loc.isInvalid() && "Invalid location in RequireCompleteType"); 5043 // FIXME: Add this assertion to help us flush out problems with 5044 // checking for dependent types and type-dependent expressions. 5045 // 5046 // assert(!T->isDependentType() && 5047 // "Can't ask whether a dependent type is complete"); 5048 5049 // If we have a complete type, we're done. 5050 NamedDecl *Def = 0; 5051 if (!T->isIncompleteType(&Def)) { 5052 // If we know about the definition but it is not visible, complain. 5053 if (!Diagnoser.Suppressed && Def && !LookupResult::isVisible(*this, Def)) { 5054 // Suppress this error outside of a SFINAE context if we've already 5055 // emitted the error once for this type. There's no usefulness in 5056 // repeating the diagnostic. 5057 // FIXME: Add a Fix-It that imports the corresponding module or includes 5058 // the header. 5059 Module *Owner = Def->getOwningModule(); 5060 Diag(Loc, diag::err_module_private_definition) 5061 << T << Owner->getFullModuleName(); 5062 Diag(Def->getLocation(), diag::note_previous_definition); 5063 5064 if (!isSFINAEContext()) { 5065 // Recover by implicitly importing this module. 5066 createImplicitModuleImport(Loc, Owner); 5067 } 5068 } 5069 5070 return false; 5071 } 5072 5073 // FIXME: If there's an unimported definition of this type in a module (for 5074 // instance, because we forward declared it, then imported the definition), 5075 // import that definition now. 5076 // FIXME: What about other cases where an import extends a redeclaration 5077 // chain for a declaration that can be accessed through a mechanism other 5078 // than name lookup (eg, referenced in a template, or a variable whose type 5079 // could be completed by the module)? 5080 5081 const TagType *Tag = T->getAs<TagType>(); 5082 const ObjCInterfaceType *IFace = 0; 5083 5084 if (Tag) { 5085 // Avoid diagnosing invalid decls as incomplete. 5086 if (Tag->getDecl()->isInvalidDecl()) 5087 return true; 5088 5089 // Give the external AST source a chance to complete the type. 5090 if (Tag->getDecl()->hasExternalLexicalStorage()) { 5091 Context.getExternalSource()->CompleteType(Tag->getDecl()); 5092 if (!Tag->isIncompleteType()) 5093 return false; 5094 } 5095 } 5096 else if ((IFace = T->getAs<ObjCInterfaceType>())) { 5097 // Avoid diagnosing invalid decls as incomplete. 5098 if (IFace->getDecl()->isInvalidDecl()) 5099 return true; 5100 5101 // Give the external AST source a chance to complete the type. 5102 if (IFace->getDecl()->hasExternalLexicalStorage()) { 5103 Context.getExternalSource()->CompleteType(IFace->getDecl()); 5104 if (!IFace->isIncompleteType()) 5105 return false; 5106 } 5107 } 5108 5109 // If we have a class template specialization or a class member of a 5110 // class template specialization, or an array with known size of such, 5111 // try to instantiate it. 5112 QualType MaybeTemplate = T; 5113 while (const ConstantArrayType *Array 5114 = Context.getAsConstantArrayType(MaybeTemplate)) 5115 MaybeTemplate = Array->getElementType(); 5116 if (const RecordType *Record = MaybeTemplate->getAs<RecordType>()) { 5117 if (ClassTemplateSpecializationDecl *ClassTemplateSpec 5118 = dyn_cast<ClassTemplateSpecializationDecl>(Record->getDecl())) { 5119 if (ClassTemplateSpec->getSpecializationKind() == TSK_Undeclared) 5120 return InstantiateClassTemplateSpecialization(Loc, ClassTemplateSpec, 5121 TSK_ImplicitInstantiation, 5122 /*Complain=*/!Diagnoser.Suppressed); 5123 } else if (CXXRecordDecl *Rec 5124 = dyn_cast<CXXRecordDecl>(Record->getDecl())) { 5125 CXXRecordDecl *Pattern = Rec->getInstantiatedFromMemberClass(); 5126 if (!Rec->isBeingDefined() && Pattern) { 5127 MemberSpecializationInfo *MSI = Rec->getMemberSpecializationInfo(); 5128 assert(MSI && "Missing member specialization information?"); 5129 // This record was instantiated from a class within a template. 5130 if (MSI->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 5131 return InstantiateClass(Loc, Rec, Pattern, 5132 getTemplateInstantiationArgs(Rec), 5133 TSK_ImplicitInstantiation, 5134 /*Complain=*/!Diagnoser.Suppressed); 5135 } 5136 } 5137 } 5138 5139 if (Diagnoser.Suppressed) 5140 return true; 5141 5142 // We have an incomplete type. Produce a diagnostic. 5143 if (Ident___float128 && 5144 T == Context.getTypeDeclType(Context.getFloat128StubType())) { 5145 Diag(Loc, diag::err_typecheck_decl_incomplete_type___float128); 5146 return true; 5147 } 5148 5149 Diagnoser.diagnose(*this, Loc, T); 5150 5151 // If the type was a forward declaration of a class/struct/union 5152 // type, produce a note. 5153 if (Tag && !Tag->getDecl()->isInvalidDecl()) 5154 Diag(Tag->getDecl()->getLocation(), 5155 Tag->isBeingDefined() ? diag::note_type_being_defined 5156 : diag::note_forward_declaration) 5157 << QualType(Tag, 0); 5158 5159 // If the Objective-C class was a forward declaration, produce a note. 5160 if (IFace && !IFace->getDecl()->isInvalidDecl()) 5161 Diag(IFace->getDecl()->getLocation(), diag::note_forward_class); 5162 5163 // If we have external information that we can use to suggest a fix, 5164 // produce a note. 5165 if (ExternalSource) 5166 ExternalSource->MaybeDiagnoseMissingCompleteType(Loc, T); 5167 5168 return true; 5169} 5170 5171bool Sema::RequireCompleteType(SourceLocation Loc, QualType T, 5172 unsigned DiagID) { 5173 TypeDiagnoserDiag Diagnoser(DiagID); 5174 return RequireCompleteType(Loc, T, Diagnoser); 5175} 5176 5177/// \brief Get diagnostic %select index for tag kind for 5178/// literal type diagnostic message. 5179/// WARNING: Indexes apply to particular diagnostics only! 5180/// 5181/// \returns diagnostic %select index. 5182static unsigned getLiteralDiagFromTagKind(TagTypeKind Tag) { 5183 switch (Tag) { 5184 case TTK_Struct: return 0; 5185 case TTK_Interface: return 1; 5186 case TTK_Class: return 2; 5187 default: llvm_unreachable("Invalid tag kind for literal type diagnostic!"); 5188 } 5189} 5190 5191/// @brief Ensure that the type T is a literal type. 5192/// 5193/// This routine checks whether the type @p T is a literal type. If @p T is an 5194/// incomplete type, an attempt is made to complete it. If @p T is a literal 5195/// type, or @p AllowIncompleteType is true and @p T is an incomplete type, 5196/// returns false. Otherwise, this routine issues the diagnostic @p PD (giving 5197/// it the type @p T), along with notes explaining why the type is not a 5198/// literal type, and returns true. 5199/// 5200/// @param Loc The location in the source that the non-literal type 5201/// diagnostic should refer to. 5202/// 5203/// @param T The type that this routine is examining for literalness. 5204/// 5205/// @param Diagnoser Emits a diagnostic if T is not a literal type. 5206/// 5207/// @returns @c true if @p T is not a literal type and a diagnostic was emitted, 5208/// @c false otherwise. 5209bool Sema::RequireLiteralType(SourceLocation Loc, QualType T, 5210 TypeDiagnoser &Diagnoser) { 5211 assert(!T->isDependentType() && "type should not be dependent"); 5212 5213 QualType ElemType = Context.getBaseElementType(T); 5214 RequireCompleteType(Loc, ElemType, 0); 5215 5216 if (T->isLiteralType(Context)) 5217 return false; 5218 5219 if (Diagnoser.Suppressed) 5220 return true; 5221 5222 Diagnoser.diagnose(*this, Loc, T); 5223 5224 if (T->isVariableArrayType()) 5225 return true; 5226 5227 const RecordType *RT = ElemType->getAs<RecordType>(); 5228 if (!RT) 5229 return true; 5230 5231 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 5232 5233 // A partially-defined class type can't be a literal type, because a literal 5234 // class type must have a trivial destructor (which can't be checked until 5235 // the class definition is complete). 5236 if (!RD->isCompleteDefinition()) { 5237 RequireCompleteType(Loc, ElemType, diag::note_non_literal_incomplete, T); 5238 return true; 5239 } 5240 5241 // If the class has virtual base classes, then it's not an aggregate, and 5242 // cannot have any constexpr constructors or a trivial default constructor, 5243 // so is non-literal. This is better to diagnose than the resulting absence 5244 // of constexpr constructors. 5245 if (RD->getNumVBases()) { 5246 Diag(RD->getLocation(), diag::note_non_literal_virtual_base) 5247 << getLiteralDiagFromTagKind(RD->getTagKind()) << RD->getNumVBases(); 5248 for (CXXRecordDecl::base_class_const_iterator I = RD->vbases_begin(), 5249 E = RD->vbases_end(); I != E; ++I) 5250 Diag(I->getLocStart(), 5251 diag::note_constexpr_virtual_base_here) << I->getSourceRange(); 5252 } else if (!RD->isAggregate() && !RD->hasConstexprNonCopyMoveConstructor() && 5253 !RD->hasTrivialDefaultConstructor()) { 5254 Diag(RD->getLocation(), diag::note_non_literal_no_constexpr_ctors) << RD; 5255 } else if (RD->hasNonLiteralTypeFieldsOrBases()) { 5256 for (CXXRecordDecl::base_class_const_iterator I = RD->bases_begin(), 5257 E = RD->bases_end(); I != E; ++I) { 5258 if (!I->getType()->isLiteralType(Context)) { 5259 Diag(I->getLocStart(), 5260 diag::note_non_literal_base_class) 5261 << RD << I->getType() << I->getSourceRange(); 5262 return true; 5263 } 5264 } 5265 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 5266 E = RD->field_end(); I != E; ++I) { 5267 if (!I->getType()->isLiteralType(Context) || 5268 I->getType().isVolatileQualified()) { 5269 Diag(I->getLocation(), diag::note_non_literal_field) 5270 << RD << *I << I->getType() 5271 << I->getType().isVolatileQualified(); 5272 return true; 5273 } 5274 } 5275 } else if (!RD->hasTrivialDestructor()) { 5276 // All fields and bases are of literal types, so have trivial destructors. 5277 // If this class's destructor is non-trivial it must be user-declared. 5278 CXXDestructorDecl *Dtor = RD->getDestructor(); 5279 assert(Dtor && "class has literal fields and bases but no dtor?"); 5280 if (!Dtor) 5281 return true; 5282 5283 Diag(Dtor->getLocation(), Dtor->isUserProvided() ? 5284 diag::note_non_literal_user_provided_dtor : 5285 diag::note_non_literal_nontrivial_dtor) << RD; 5286 if (!Dtor->isUserProvided()) 5287 SpecialMemberIsTrivial(Dtor, CXXDestructor, /*Diagnose*/true); 5288 } 5289 5290 return true; 5291} 5292 5293bool Sema::RequireLiteralType(SourceLocation Loc, QualType T, unsigned DiagID) { 5294 TypeDiagnoserDiag Diagnoser(DiagID); 5295 return RequireLiteralType(Loc, T, Diagnoser); 5296} 5297 5298/// \brief Retrieve a version of the type 'T' that is elaborated by Keyword 5299/// and qualified by the nested-name-specifier contained in SS. 5300QualType Sema::getElaboratedType(ElaboratedTypeKeyword Keyword, 5301 const CXXScopeSpec &SS, QualType T) { 5302 if (T.isNull()) 5303 return T; 5304 NestedNameSpecifier *NNS; 5305 if (SS.isValid()) 5306 NNS = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 5307 else { 5308 if (Keyword == ETK_None) 5309 return T; 5310 NNS = 0; 5311 } 5312 return Context.getElaboratedType(Keyword, NNS, T); 5313} 5314 5315QualType Sema::BuildTypeofExprType(Expr *E, SourceLocation Loc) { 5316 ExprResult ER = CheckPlaceholderExpr(E); 5317 if (ER.isInvalid()) return QualType(); 5318 E = ER.take(); 5319 5320 if (!E->isTypeDependent()) { 5321 QualType T = E->getType(); 5322 if (const TagType *TT = T->getAs<TagType>()) 5323 DiagnoseUseOfDecl(TT->getDecl(), E->getExprLoc()); 5324 } 5325 return Context.getTypeOfExprType(E); 5326} 5327 5328/// getDecltypeForExpr - Given an expr, will return the decltype for 5329/// that expression, according to the rules in C++11 5330/// [dcl.type.simple]p4 and C++11 [expr.lambda.prim]p18. 5331static QualType getDecltypeForExpr(Sema &S, Expr *E) { 5332 if (E->isTypeDependent()) 5333 return S.Context.DependentTy; 5334 5335 // C++11 [dcl.type.simple]p4: 5336 // The type denoted by decltype(e) is defined as follows: 5337 // 5338 // - if e is an unparenthesized id-expression or an unparenthesized class 5339 // member access (5.2.5), decltype(e) is the type of the entity named 5340 // by e. If there is no such entity, or if e names a set of overloaded 5341 // functions, the program is ill-formed; 5342 // 5343 // We apply the same rules for Objective-C ivar and property references. 5344 if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E)) { 5345 if (const ValueDecl *VD = dyn_cast<ValueDecl>(DRE->getDecl())) 5346 return VD->getType(); 5347 } else if (const MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 5348 if (const FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl())) 5349 return FD->getType(); 5350 } else if (const ObjCIvarRefExpr *IR = dyn_cast<ObjCIvarRefExpr>(E)) { 5351 return IR->getDecl()->getType(); 5352 } else if (const ObjCPropertyRefExpr *PR = dyn_cast<ObjCPropertyRefExpr>(E)) { 5353 if (PR->isExplicitProperty()) 5354 return PR->getExplicitProperty()->getType(); 5355 } 5356 5357 // C++11 [expr.lambda.prim]p18: 5358 // Every occurrence of decltype((x)) where x is a possibly 5359 // parenthesized id-expression that names an entity of automatic 5360 // storage duration is treated as if x were transformed into an 5361 // access to a corresponding data member of the closure type that 5362 // would have been declared if x were an odr-use of the denoted 5363 // entity. 5364 using namespace sema; 5365 if (S.getCurLambda()) { 5366 if (isa<ParenExpr>(E)) { 5367 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E->IgnoreParens())) { 5368 if (VarDecl *Var = dyn_cast<VarDecl>(DRE->getDecl())) { 5369 QualType T = S.getCapturedDeclRefType(Var, DRE->getLocation()); 5370 if (!T.isNull()) 5371 return S.Context.getLValueReferenceType(T); 5372 } 5373 } 5374 } 5375 } 5376 5377 5378 // C++11 [dcl.type.simple]p4: 5379 // [...] 5380 QualType T = E->getType(); 5381 switch (E->getValueKind()) { 5382 // - otherwise, if e is an xvalue, decltype(e) is T&&, where T is the 5383 // type of e; 5384 case VK_XValue: T = S.Context.getRValueReferenceType(T); break; 5385 // - otherwise, if e is an lvalue, decltype(e) is T&, where T is the 5386 // type of e; 5387 case VK_LValue: T = S.Context.getLValueReferenceType(T); break; 5388 // - otherwise, decltype(e) is the type of e. 5389 case VK_RValue: break; 5390 } 5391 5392 return T; 5393} 5394 5395QualType Sema::BuildDecltypeType(Expr *E, SourceLocation Loc) { 5396 ExprResult ER = CheckPlaceholderExpr(E); 5397 if (ER.isInvalid()) return QualType(); 5398 E = ER.take(); 5399 5400 return Context.getDecltypeType(E, getDecltypeForExpr(*this, E)); 5401} 5402 5403QualType Sema::BuildUnaryTransformType(QualType BaseType, 5404 UnaryTransformType::UTTKind UKind, 5405 SourceLocation Loc) { 5406 switch (UKind) { 5407 case UnaryTransformType::EnumUnderlyingType: 5408 if (!BaseType->isDependentType() && !BaseType->isEnumeralType()) { 5409 Diag(Loc, diag::err_only_enums_have_underlying_types); 5410 return QualType(); 5411 } else { 5412 QualType Underlying = BaseType; 5413 if (!BaseType->isDependentType()) { 5414 EnumDecl *ED = BaseType->getAs<EnumType>()->getDecl(); 5415 assert(ED && "EnumType has no EnumDecl"); 5416 DiagnoseUseOfDecl(ED, Loc); 5417 Underlying = ED->getIntegerType(); 5418 } 5419 assert(!Underlying.isNull()); 5420 return Context.getUnaryTransformType(BaseType, Underlying, 5421 UnaryTransformType::EnumUnderlyingType); 5422 } 5423 } 5424 llvm_unreachable("unknown unary transform type"); 5425} 5426 5427QualType Sema::BuildAtomicType(QualType T, SourceLocation Loc) { 5428 if (!T->isDependentType()) { 5429 // FIXME: It isn't entirely clear whether incomplete atomic types 5430 // are allowed or not; for simplicity, ban them for the moment. 5431 if (RequireCompleteType(Loc, T, diag::err_atomic_specifier_bad_type, 0)) 5432 return QualType(); 5433 5434 int DisallowedKind = -1; 5435 if (T->isArrayType()) 5436 DisallowedKind = 1; 5437 else if (T->isFunctionType()) 5438 DisallowedKind = 2; 5439 else if (T->isReferenceType()) 5440 DisallowedKind = 3; 5441 else if (T->isAtomicType()) 5442 DisallowedKind = 4; 5443 else if (T.hasQualifiers()) 5444 DisallowedKind = 5; 5445 else if (!T.isTriviallyCopyableType(Context)) 5446 // Some other non-trivially-copyable type (probably a C++ class) 5447 DisallowedKind = 6; 5448 5449 if (DisallowedKind != -1) { 5450 Diag(Loc, diag::err_atomic_specifier_bad_type) << DisallowedKind << T; 5451 return QualType(); 5452 } 5453 5454 // FIXME: Do we need any handling for ARC here? 5455 } 5456 5457 // Build the pointer type. 5458 return Context.getAtomicType(T); 5459} 5460