SemaType.cpp revision 658cd2c287b1a0b419f51cd18e5a48d4560d1c56
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 41/// isOmittedBlockReturnType - Return true if this declarator is missing a 42/// return type because this is a omitted return type on a block literal. 43static bool isOmittedBlockReturnType(const Declarator &D) { 44 if (D.getContext() != Declarator::BlockLiteralContext || 45 D.getDeclSpec().hasTypeSpecifier()) 46 return false; 47 48 if (D.getNumTypeObjects() == 0) 49 return true; // ^{ ... } 50 51 if (D.getNumTypeObjects() == 1 && 52 D.getTypeObject(0).Kind == DeclaratorChunk::Function) 53 return true; // ^(int X, float Y) { ... } 54 55 return false; 56} 57 58/// diagnoseBadTypeAttribute - Diagnoses a type attribute which 59/// doesn't apply to the given type. 60static void diagnoseBadTypeAttribute(Sema &S, const AttributeList &attr, 61 QualType type) { 62 bool useExpansionLoc = false; 63 64 unsigned diagID = 0; 65 switch (attr.getKind()) { 66 case AttributeList::AT_ObjCGC: 67 diagID = diag::warn_pointer_attribute_wrong_type; 68 useExpansionLoc = true; 69 break; 70 71 case AttributeList::AT_ObjCOwnership: 72 diagID = diag::warn_objc_object_attribute_wrong_type; 73 useExpansionLoc = true; 74 break; 75 76 default: 77 // Assume everything else was a function attribute. 78 diagID = diag::warn_function_attribute_wrong_type; 79 break; 80 } 81 82 SourceLocation loc = attr.getLoc(); 83 StringRef name = attr.getName()->getName(); 84 85 // The GC attributes are usually written with macros; special-case them. 86 if (useExpansionLoc && loc.isMacroID() && attr.getParameterName()) { 87 if (attr.getParameterName()->isStr("strong")) { 88 if (S.findMacroSpelling(loc, "__strong")) name = "__strong"; 89 } else if (attr.getParameterName()->isStr("weak")) { 90 if (S.findMacroSpelling(loc, "__weak")) name = "__weak"; 91 } 92 } 93 94 S.Diag(loc, diagID) << name << 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_Regparm: \ 112 case AttributeList::AT_Pcs: \ 113 case AttributeList::AT_PnaclCall: \ 114 case AttributeList::AT_IntelOclBicc 115 116// Microsoft-specific type qualifiers. 117#define MS_TYPE_ATTRS_CASELIST \ 118 case AttributeList::AT_Ptr32: \ 119 case AttributeList::AT_Ptr64: \ 120 case AttributeList::AT_SPtr: \ 121 case AttributeList::AT_UPtr 122 123namespace { 124 /// An object which stores processing state for the entire 125 /// GetTypeForDeclarator process. 126 class TypeProcessingState { 127 Sema &sema; 128 129 /// The declarator being processed. 130 Declarator &declarator; 131 132 /// The index of the declarator chunk we're currently processing. 133 /// May be the total number of valid chunks, indicating the 134 /// DeclSpec. 135 unsigned chunkIndex; 136 137 /// Whether there are non-trivial modifications to the decl spec. 138 bool trivial; 139 140 /// Whether we saved the attributes in the decl spec. 141 bool hasSavedAttrs; 142 143 /// The original set of attributes on the DeclSpec. 144 SmallVector<AttributeList*, 2> savedAttrs; 145 146 /// A list of attributes to diagnose the uselessness of when the 147 /// processing is complete. 148 SmallVector<AttributeList*, 2> ignoredTypeAttrs; 149 150 public: 151 TypeProcessingState(Sema &sema, Declarator &declarator) 152 : sema(sema), declarator(declarator), 153 chunkIndex(declarator.getNumTypeObjects()), 154 trivial(true), hasSavedAttrs(false) {} 155 156 Sema &getSema() const { 157 return sema; 158 } 159 160 Declarator &getDeclarator() const { 161 return declarator; 162 } 163 164 bool isProcessingDeclSpec() const { 165 return chunkIndex == declarator.getNumTypeObjects(); 166 } 167 168 unsigned getCurrentChunkIndex() const { 169 return chunkIndex; 170 } 171 172 void setCurrentChunkIndex(unsigned idx) { 173 assert(idx <= declarator.getNumTypeObjects()); 174 chunkIndex = idx; 175 } 176 177 AttributeList *&getCurrentAttrListRef() const { 178 if (isProcessingDeclSpec()) 179 return getMutableDeclSpec().getAttributes().getListRef(); 180 return declarator.getTypeObject(chunkIndex).getAttrListRef(); 181 } 182 183 /// Save the current set of attributes on the DeclSpec. 184 void saveDeclSpecAttrs() { 185 // Don't try to save them multiple times. 186 if (hasSavedAttrs) return; 187 188 DeclSpec &spec = getMutableDeclSpec(); 189 for (AttributeList *attr = spec.getAttributes().getList(); attr; 190 attr = attr->getNext()) 191 savedAttrs.push_back(attr); 192 trivial &= savedAttrs.empty(); 193 hasSavedAttrs = true; 194 } 195 196 /// Record that we had nowhere to put the given type attribute. 197 /// We will diagnose such attributes later. 198 void addIgnoredTypeAttr(AttributeList &attr) { 199 ignoredTypeAttrs.push_back(&attr); 200 } 201 202 /// Diagnose all the ignored type attributes, given that the 203 /// declarator worked out to the given type. 204 void diagnoseIgnoredTypeAttrs(QualType type) const { 205 for (SmallVectorImpl<AttributeList*>::const_iterator 206 i = ignoredTypeAttrs.begin(), e = ignoredTypeAttrs.end(); 207 i != e; ++i) 208 diagnoseBadTypeAttribute(getSema(), **i, type); 209 } 210 211 ~TypeProcessingState() { 212 if (trivial) return; 213 214 restoreDeclSpecAttrs(); 215 } 216 217 private: 218 DeclSpec &getMutableDeclSpec() const { 219 return const_cast<DeclSpec&>(declarator.getDeclSpec()); 220 } 221 222 void restoreDeclSpecAttrs() { 223 assert(hasSavedAttrs); 224 225 if (savedAttrs.empty()) { 226 getMutableDeclSpec().getAttributes().set(0); 227 return; 228 } 229 230 getMutableDeclSpec().getAttributes().set(savedAttrs[0]); 231 for (unsigned i = 0, e = savedAttrs.size() - 1; i != e; ++i) 232 savedAttrs[i]->setNext(savedAttrs[i+1]); 233 savedAttrs.back()->setNext(0); 234 } 235 }; 236 237 /// Basically std::pair except that we really want to avoid an 238 /// implicit operator= for safety concerns. It's also a minor 239 /// link-time optimization for this to be a private type. 240 struct AttrAndList { 241 /// The attribute. 242 AttributeList &first; 243 244 /// The head of the list the attribute is currently in. 245 AttributeList *&second; 246 247 AttrAndList(AttributeList &attr, AttributeList *&head) 248 : first(attr), second(head) {} 249 }; 250} 251 252namespace llvm { 253 template <> struct isPodLike<AttrAndList> { 254 static const bool value = true; 255 }; 256} 257 258static void spliceAttrIntoList(AttributeList &attr, AttributeList *&head) { 259 attr.setNext(head); 260 head = &attr; 261} 262 263static void spliceAttrOutOfList(AttributeList &attr, AttributeList *&head) { 264 if (head == &attr) { 265 head = attr.getNext(); 266 return; 267 } 268 269 AttributeList *cur = head; 270 while (true) { 271 assert(cur && cur->getNext() && "ran out of attrs?"); 272 if (cur->getNext() == &attr) { 273 cur->setNext(attr.getNext()); 274 return; 275 } 276 cur = cur->getNext(); 277 } 278} 279 280static void moveAttrFromListToList(AttributeList &attr, 281 AttributeList *&fromList, 282 AttributeList *&toList) { 283 spliceAttrOutOfList(attr, fromList); 284 spliceAttrIntoList(attr, toList); 285} 286 287/// The location of a type attribute. 288enum TypeAttrLocation { 289 /// The attribute is in the decl-specifier-seq. 290 TAL_DeclSpec, 291 /// The attribute is part of a DeclaratorChunk. 292 TAL_DeclChunk, 293 /// The attribute is immediately after the declaration's name. 294 TAL_DeclName 295}; 296 297static void processTypeAttrs(TypeProcessingState &state, 298 QualType &type, TypeAttrLocation TAL, 299 AttributeList *attrs); 300 301static bool handleFunctionTypeAttr(TypeProcessingState &state, 302 AttributeList &attr, 303 QualType &type); 304 305static bool handleMSPointerTypeQualifierAttr(TypeProcessingState &state, 306 AttributeList &attr, 307 QualType &type); 308 309static bool handleObjCGCTypeAttr(TypeProcessingState &state, 310 AttributeList &attr, QualType &type); 311 312static bool handleObjCOwnershipTypeAttr(TypeProcessingState &state, 313 AttributeList &attr, QualType &type); 314 315static bool handleObjCPointerTypeAttr(TypeProcessingState &state, 316 AttributeList &attr, QualType &type) { 317 if (attr.getKind() == AttributeList::AT_ObjCGC) 318 return handleObjCGCTypeAttr(state, attr, type); 319 assert(attr.getKind() == AttributeList::AT_ObjCOwnership); 320 return handleObjCOwnershipTypeAttr(state, attr, type); 321} 322 323/// Given the index of a declarator chunk, check whether that chunk 324/// directly specifies the return type of a function and, if so, find 325/// an appropriate place for it. 326/// 327/// \param i - a notional index which the search will start 328/// immediately inside 329static DeclaratorChunk *maybeMovePastReturnType(Declarator &declarator, 330 unsigned i) { 331 assert(i <= declarator.getNumTypeObjects()); 332 333 DeclaratorChunk *result = 0; 334 335 // First, look inwards past parens for a function declarator. 336 for (; i != 0; --i) { 337 DeclaratorChunk &fnChunk = declarator.getTypeObject(i-1); 338 switch (fnChunk.Kind) { 339 case DeclaratorChunk::Paren: 340 continue; 341 342 // If we find anything except a function, bail out. 343 case DeclaratorChunk::Pointer: 344 case DeclaratorChunk::BlockPointer: 345 case DeclaratorChunk::Array: 346 case DeclaratorChunk::Reference: 347 case DeclaratorChunk::MemberPointer: 348 return result; 349 350 // If we do find a function declarator, scan inwards from that, 351 // looking for a block-pointer declarator. 352 case DeclaratorChunk::Function: 353 for (--i; i != 0; --i) { 354 DeclaratorChunk &blockChunk = declarator.getTypeObject(i-1); 355 switch (blockChunk.Kind) { 356 case DeclaratorChunk::Paren: 357 case DeclaratorChunk::Pointer: 358 case DeclaratorChunk::Array: 359 case DeclaratorChunk::Function: 360 case DeclaratorChunk::Reference: 361 case DeclaratorChunk::MemberPointer: 362 continue; 363 case DeclaratorChunk::BlockPointer: 364 result = &blockChunk; 365 goto continue_outer; 366 } 367 llvm_unreachable("bad declarator chunk kind"); 368 } 369 370 // If we run out of declarators doing that, we're done. 371 return result; 372 } 373 llvm_unreachable("bad declarator chunk kind"); 374 375 // Okay, reconsider from our new point. 376 continue_outer: ; 377 } 378 379 // Ran out of chunks, bail out. 380 return result; 381} 382 383/// Given that an objc_gc attribute was written somewhere on a 384/// declaration *other* than on the declarator itself (for which, use 385/// distributeObjCPointerTypeAttrFromDeclarator), and given that it 386/// didn't apply in whatever position it was written in, try to move 387/// it to a more appropriate position. 388static void distributeObjCPointerTypeAttr(TypeProcessingState &state, 389 AttributeList &attr, 390 QualType type) { 391 Declarator &declarator = state.getDeclarator(); 392 393 // Move it to the outermost normal or block pointer declarator. 394 for (unsigned i = state.getCurrentChunkIndex(); i != 0; --i) { 395 DeclaratorChunk &chunk = declarator.getTypeObject(i-1); 396 switch (chunk.Kind) { 397 case DeclaratorChunk::Pointer: 398 case DeclaratorChunk::BlockPointer: { 399 // But don't move an ARC ownership attribute to the return type 400 // of a block. 401 DeclaratorChunk *destChunk = 0; 402 if (state.isProcessingDeclSpec() && 403 attr.getKind() == AttributeList::AT_ObjCOwnership) 404 destChunk = maybeMovePastReturnType(declarator, i - 1); 405 if (!destChunk) destChunk = &chunk; 406 407 moveAttrFromListToList(attr, state.getCurrentAttrListRef(), 408 destChunk->getAttrListRef()); 409 return; 410 } 411 412 case DeclaratorChunk::Paren: 413 case DeclaratorChunk::Array: 414 continue; 415 416 // We may be starting at the return type of a block. 417 case DeclaratorChunk::Function: 418 if (state.isProcessingDeclSpec() && 419 attr.getKind() == AttributeList::AT_ObjCOwnership) { 420 if (DeclaratorChunk *dest = maybeMovePastReturnType(declarator, i)) { 421 moveAttrFromListToList(attr, state.getCurrentAttrListRef(), 422 dest->getAttrListRef()); 423 return; 424 } 425 } 426 goto error; 427 428 // Don't walk through these. 429 case DeclaratorChunk::Reference: 430 case DeclaratorChunk::MemberPointer: 431 goto error; 432 } 433 } 434 error: 435 436 diagnoseBadTypeAttribute(state.getSema(), attr, type); 437} 438 439/// Distribute an objc_gc type attribute that was written on the 440/// declarator. 441static void 442distributeObjCPointerTypeAttrFromDeclarator(TypeProcessingState &state, 443 AttributeList &attr, 444 QualType &declSpecType) { 445 Declarator &declarator = state.getDeclarator(); 446 447 // objc_gc goes on the innermost pointer to something that's not a 448 // pointer. 449 unsigned innermost = -1U; 450 bool considerDeclSpec = true; 451 for (unsigned i = 0, e = declarator.getNumTypeObjects(); i != e; ++i) { 452 DeclaratorChunk &chunk = declarator.getTypeObject(i); 453 switch (chunk.Kind) { 454 case DeclaratorChunk::Pointer: 455 case DeclaratorChunk::BlockPointer: 456 innermost = i; 457 continue; 458 459 case DeclaratorChunk::Reference: 460 case DeclaratorChunk::MemberPointer: 461 case DeclaratorChunk::Paren: 462 case DeclaratorChunk::Array: 463 continue; 464 465 case DeclaratorChunk::Function: 466 considerDeclSpec = false; 467 goto done; 468 } 469 } 470 done: 471 472 // That might actually be the decl spec if we weren't blocked by 473 // anything in the declarator. 474 if (considerDeclSpec) { 475 if (handleObjCPointerTypeAttr(state, attr, declSpecType)) { 476 // Splice the attribute into the decl spec. Prevents the 477 // attribute from being applied multiple times and gives 478 // the source-location-filler something to work with. 479 state.saveDeclSpecAttrs(); 480 moveAttrFromListToList(attr, declarator.getAttrListRef(), 481 declarator.getMutableDeclSpec().getAttributes().getListRef()); 482 return; 483 } 484 } 485 486 // Otherwise, if we found an appropriate chunk, splice the attribute 487 // into it. 488 if (innermost != -1U) { 489 moveAttrFromListToList(attr, declarator.getAttrListRef(), 490 declarator.getTypeObject(innermost).getAttrListRef()); 491 return; 492 } 493 494 // Otherwise, diagnose when we're done building the type. 495 spliceAttrOutOfList(attr, declarator.getAttrListRef()); 496 state.addIgnoredTypeAttr(attr); 497} 498 499/// A function type attribute was written somewhere in a declaration 500/// *other* than on the declarator itself or in the decl spec. Given 501/// that it didn't apply in whatever position it was written in, try 502/// to move it to a more appropriate position. 503static void distributeFunctionTypeAttr(TypeProcessingState &state, 504 AttributeList &attr, 505 QualType type) { 506 Declarator &declarator = state.getDeclarator(); 507 508 // Try to push the attribute from the return type of a function to 509 // the function itself. 510 for (unsigned i = state.getCurrentChunkIndex(); i != 0; --i) { 511 DeclaratorChunk &chunk = declarator.getTypeObject(i-1); 512 switch (chunk.Kind) { 513 case DeclaratorChunk::Function: 514 moveAttrFromListToList(attr, state.getCurrentAttrListRef(), 515 chunk.getAttrListRef()); 516 return; 517 518 case DeclaratorChunk::Paren: 519 case DeclaratorChunk::Pointer: 520 case DeclaratorChunk::BlockPointer: 521 case DeclaratorChunk::Array: 522 case DeclaratorChunk::Reference: 523 case DeclaratorChunk::MemberPointer: 524 continue; 525 } 526 } 527 528 diagnoseBadTypeAttribute(state.getSema(), attr, type); 529} 530 531/// Try to distribute a function type attribute to the innermost 532/// function chunk or type. Returns true if the attribute was 533/// distributed, false if no location was found. 534static bool 535distributeFunctionTypeAttrToInnermost(TypeProcessingState &state, 536 AttributeList &attr, 537 AttributeList *&attrList, 538 QualType &declSpecType) { 539 Declarator &declarator = state.getDeclarator(); 540 541 // Put it on the innermost function chunk, if there is one. 542 for (unsigned i = 0, e = declarator.getNumTypeObjects(); i != e; ++i) { 543 DeclaratorChunk &chunk = declarator.getTypeObject(i); 544 if (chunk.Kind != DeclaratorChunk::Function) continue; 545 546 moveAttrFromListToList(attr, attrList, chunk.getAttrListRef()); 547 return true; 548 } 549 550 if (handleFunctionTypeAttr(state, attr, declSpecType)) { 551 spliceAttrOutOfList(attr, attrList); 552 return true; 553 } 554 555 return false; 556} 557 558/// A function type attribute was written in the decl spec. Try to 559/// apply it somewhere. 560static void 561distributeFunctionTypeAttrFromDeclSpec(TypeProcessingState &state, 562 AttributeList &attr, 563 QualType &declSpecType) { 564 state.saveDeclSpecAttrs(); 565 566 // C++11 attributes before the decl specifiers actually appertain to 567 // the declarators. Move them straight there. We don't support the 568 // 'put them wherever you like' semantics we allow for GNU attributes. 569 if (attr.isCXX11Attribute()) { 570 moveAttrFromListToList(attr, state.getCurrentAttrListRef(), 571 state.getDeclarator().getAttrListRef()); 572 return; 573 } 574 575 // Try to distribute to the innermost. 576 if (distributeFunctionTypeAttrToInnermost(state, attr, 577 state.getCurrentAttrListRef(), 578 declSpecType)) 579 return; 580 581 // If that failed, diagnose the bad attribute when the declarator is 582 // fully built. 583 state.addIgnoredTypeAttr(attr); 584} 585 586/// A function type attribute was written on the declarator. Try to 587/// apply it somewhere. 588static void 589distributeFunctionTypeAttrFromDeclarator(TypeProcessingState &state, 590 AttributeList &attr, 591 QualType &declSpecType) { 592 Declarator &declarator = state.getDeclarator(); 593 594 // Try to distribute to the innermost. 595 if (distributeFunctionTypeAttrToInnermost(state, attr, 596 declarator.getAttrListRef(), 597 declSpecType)) 598 return; 599 600 // If that failed, diagnose the bad attribute when the declarator is 601 // fully built. 602 spliceAttrOutOfList(attr, declarator.getAttrListRef()); 603 state.addIgnoredTypeAttr(attr); 604} 605 606/// \brief Given that there are attributes written on the declarator 607/// itself, try to distribute any type attributes to the appropriate 608/// declarator chunk. 609/// 610/// These are attributes like the following: 611/// int f ATTR; 612/// int (f ATTR)(); 613/// but not necessarily this: 614/// int f() ATTR; 615static void distributeTypeAttrsFromDeclarator(TypeProcessingState &state, 616 QualType &declSpecType) { 617 // Collect all the type attributes from the declarator itself. 618 assert(state.getDeclarator().getAttributes() && "declarator has no attrs!"); 619 AttributeList *attr = state.getDeclarator().getAttributes(); 620 AttributeList *next; 621 do { 622 next = attr->getNext(); 623 624 // Do not distribute C++11 attributes. They have strict rules for what 625 // they appertain to. 626 if (attr->isCXX11Attribute()) 627 continue; 628 629 switch (attr->getKind()) { 630 OBJC_POINTER_TYPE_ATTRS_CASELIST: 631 distributeObjCPointerTypeAttrFromDeclarator(state, *attr, declSpecType); 632 break; 633 634 case AttributeList::AT_NSReturnsRetained: 635 if (!state.getSema().getLangOpts().ObjCAutoRefCount) 636 break; 637 // fallthrough 638 639 FUNCTION_TYPE_ATTRS_CASELIST: 640 distributeFunctionTypeAttrFromDeclarator(state, *attr, declSpecType); 641 break; 642 643 MS_TYPE_ATTRS_CASELIST: 644 // Microsoft type attributes cannot go after the declarator-id. 645 continue; 646 647 default: 648 break; 649 } 650 } while ((attr = next)); 651} 652 653/// Add a synthetic '()' to a block-literal declarator if it is 654/// required, given the return type. 655static void maybeSynthesizeBlockSignature(TypeProcessingState &state, 656 QualType declSpecType) { 657 Declarator &declarator = state.getDeclarator(); 658 659 // First, check whether the declarator would produce a function, 660 // i.e. whether the innermost semantic chunk is a function. 661 if (declarator.isFunctionDeclarator()) { 662 // If so, make that declarator a prototyped declarator. 663 declarator.getFunctionTypeInfo().hasPrototype = true; 664 return; 665 } 666 667 // If there are any type objects, the type as written won't name a 668 // function, regardless of the decl spec type. This is because a 669 // block signature declarator is always an abstract-declarator, and 670 // abstract-declarators can't just be parentheses chunks. Therefore 671 // we need to build a function chunk unless there are no type 672 // objects and the decl spec type is a function. 673 if (!declarator.getNumTypeObjects() && declSpecType->isFunctionType()) 674 return; 675 676 // Note that there *are* cases with invalid declarators where 677 // declarators consist solely of parentheses. In general, these 678 // occur only in failed efforts to make function declarators, so 679 // faking up the function chunk is still the right thing to do. 680 681 // Otherwise, we need to fake up a function declarator. 682 SourceLocation loc = declarator.getLocStart(); 683 684 // ...and *prepend* it to the declarator. 685 SourceLocation NoLoc; 686 declarator.AddInnermostTypeInfo(DeclaratorChunk::getFunction( 687 /*HasProto=*/true, 688 /*IsAmbiguous=*/false, 689 /*LParenLoc=*/NoLoc, 690 /*ArgInfo=*/0, 691 /*NumArgs=*/0, 692 /*EllipsisLoc=*/NoLoc, 693 /*RParenLoc=*/NoLoc, 694 /*TypeQuals=*/0, 695 /*RefQualifierIsLvalueRef=*/true, 696 /*RefQualifierLoc=*/NoLoc, 697 /*ConstQualifierLoc=*/NoLoc, 698 /*VolatileQualifierLoc=*/NoLoc, 699 /*MutableLoc=*/NoLoc, 700 EST_None, 701 /*ESpecLoc=*/NoLoc, 702 /*Exceptions=*/0, 703 /*ExceptionRanges=*/0, 704 /*NumExceptions=*/0, 705 /*NoexceptExpr=*/0, 706 loc, loc, declarator)); 707 708 // For consistency, make sure the state still has us as processing 709 // the decl spec. 710 assert(state.getCurrentChunkIndex() == declarator.getNumTypeObjects() - 1); 711 state.setCurrentChunkIndex(declarator.getNumTypeObjects()); 712} 713 714/// \brief Convert the specified declspec to the appropriate type 715/// object. 716/// \param state Specifies the declarator containing the declaration specifier 717/// to be converted, along with other associated processing state. 718/// \returns The type described by the declaration specifiers. This function 719/// never returns null. 720static QualType ConvertDeclSpecToType(TypeProcessingState &state) { 721 // FIXME: Should move the logic from DeclSpec::Finish to here for validity 722 // checking. 723 724 Sema &S = state.getSema(); 725 Declarator &declarator = state.getDeclarator(); 726 const DeclSpec &DS = declarator.getDeclSpec(); 727 SourceLocation DeclLoc = declarator.getIdentifierLoc(); 728 if (DeclLoc.isInvalid()) 729 DeclLoc = DS.getLocStart(); 730 731 ASTContext &Context = S.Context; 732 733 QualType Result; 734 switch (DS.getTypeSpecType()) { 735 case DeclSpec::TST_void: 736 Result = Context.VoidTy; 737 break; 738 case DeclSpec::TST_char: 739 if (DS.getTypeSpecSign() == DeclSpec::TSS_unspecified) 740 Result = Context.CharTy; 741 else if (DS.getTypeSpecSign() == DeclSpec::TSS_signed) 742 Result = Context.SignedCharTy; 743 else { 744 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unsigned && 745 "Unknown TSS value"); 746 Result = Context.UnsignedCharTy; 747 } 748 break; 749 case DeclSpec::TST_wchar: 750 if (DS.getTypeSpecSign() == DeclSpec::TSS_unspecified) 751 Result = Context.WCharTy; 752 else if (DS.getTypeSpecSign() == DeclSpec::TSS_signed) { 753 S.Diag(DS.getTypeSpecSignLoc(), diag::ext_invalid_sign_spec) 754 << DS.getSpecifierName(DS.getTypeSpecType()); 755 Result = Context.getSignedWCharType(); 756 } else { 757 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unsigned && 758 "Unknown TSS value"); 759 S.Diag(DS.getTypeSpecSignLoc(), diag::ext_invalid_sign_spec) 760 << DS.getSpecifierName(DS.getTypeSpecType()); 761 Result = Context.getUnsignedWCharType(); 762 } 763 break; 764 case DeclSpec::TST_char16: 765 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unspecified && 766 "Unknown TSS value"); 767 Result = Context.Char16Ty; 768 break; 769 case DeclSpec::TST_char32: 770 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unspecified && 771 "Unknown TSS value"); 772 Result = Context.Char32Ty; 773 break; 774 case DeclSpec::TST_unspecified: 775 // "<proto1,proto2>" is an objc qualified ID with a missing id. 776 if (DeclSpec::ProtocolQualifierListTy PQ = DS.getProtocolQualifiers()) { 777 Result = Context.getObjCObjectType(Context.ObjCBuiltinIdTy, 778 (ObjCProtocolDecl*const*)PQ, 779 DS.getNumProtocolQualifiers()); 780 Result = Context.getObjCObjectPointerType(Result); 781 break; 782 } 783 784 // If this is a missing declspec in a block literal return context, then it 785 // is inferred from the return statements inside the block. 786 // The declspec is always missing in a lambda expr context; it is either 787 // specified with a trailing return type or inferred. 788 if (declarator.getContext() == Declarator::LambdaExprContext || 789 isOmittedBlockReturnType(declarator)) { 790 Result = Context.DependentTy; 791 break; 792 } 793 794 // Unspecified typespec defaults to int in C90. However, the C90 grammar 795 // [C90 6.5] only allows a decl-spec if there was *some* type-specifier, 796 // type-qualifier, or storage-class-specifier. If not, emit an extwarn. 797 // Note that the one exception to this is function definitions, which are 798 // allowed to be completely missing a declspec. This is handled in the 799 // parser already though by it pretending to have seen an 'int' in this 800 // case. 801 if (S.getLangOpts().ImplicitInt) { 802 // In C89 mode, we only warn if there is a completely missing declspec 803 // when one is not allowed. 804 if (DS.isEmpty()) { 805 S.Diag(DeclLoc, diag::ext_missing_declspec) 806 << DS.getSourceRange() 807 << FixItHint::CreateInsertion(DS.getLocStart(), "int"); 808 } 809 } else if (!DS.hasTypeSpecifier()) { 810 // C99 and C++ require a type specifier. For example, C99 6.7.2p2 says: 811 // "At least one type specifier shall be given in the declaration 812 // specifiers in each declaration, and in the specifier-qualifier list in 813 // each struct declaration and type name." 814 if (S.getLangOpts().CPlusPlus) { 815 S.Diag(DeclLoc, diag::err_missing_type_specifier) 816 << DS.getSourceRange(); 817 818 // When this occurs in C++ code, often something is very broken with the 819 // value being declared, poison it as invalid so we don't get chains of 820 // errors. 821 declarator.setInvalidType(true); 822 } else { 823 S.Diag(DeclLoc, diag::ext_missing_type_specifier) 824 << DS.getSourceRange(); 825 } 826 } 827 828 // FALL THROUGH. 829 case DeclSpec::TST_int: { 830 if (DS.getTypeSpecSign() != DeclSpec::TSS_unsigned) { 831 switch (DS.getTypeSpecWidth()) { 832 case DeclSpec::TSW_unspecified: Result = Context.IntTy; break; 833 case DeclSpec::TSW_short: Result = Context.ShortTy; break; 834 case DeclSpec::TSW_long: Result = Context.LongTy; break; 835 case DeclSpec::TSW_longlong: 836 Result = Context.LongLongTy; 837 838 // 'long long' is a C99 or C++11 feature. 839 if (!S.getLangOpts().C99) { 840 if (S.getLangOpts().CPlusPlus) 841 S.Diag(DS.getTypeSpecWidthLoc(), 842 S.getLangOpts().CPlusPlus11 ? 843 diag::warn_cxx98_compat_longlong : diag::ext_cxx11_longlong); 844 else 845 S.Diag(DS.getTypeSpecWidthLoc(), diag::ext_c99_longlong); 846 } 847 break; 848 } 849 } else { 850 switch (DS.getTypeSpecWidth()) { 851 case DeclSpec::TSW_unspecified: Result = Context.UnsignedIntTy; break; 852 case DeclSpec::TSW_short: Result = Context.UnsignedShortTy; break; 853 case DeclSpec::TSW_long: Result = Context.UnsignedLongTy; break; 854 case DeclSpec::TSW_longlong: 855 Result = Context.UnsignedLongLongTy; 856 857 // 'long long' is a C99 or C++11 feature. 858 if (!S.getLangOpts().C99) { 859 if (S.getLangOpts().CPlusPlus) 860 S.Diag(DS.getTypeSpecWidthLoc(), 861 S.getLangOpts().CPlusPlus11 ? 862 diag::warn_cxx98_compat_longlong : diag::ext_cxx11_longlong); 863 else 864 S.Diag(DS.getTypeSpecWidthLoc(), diag::ext_c99_longlong); 865 } 866 break; 867 } 868 } 869 break; 870 } 871 case DeclSpec::TST_int128: 872 if (!S.PP.getTargetInfo().hasInt128Type()) 873 S.Diag(DS.getTypeSpecTypeLoc(), diag::err_int128_unsupported); 874 if (DS.getTypeSpecSign() == DeclSpec::TSS_unsigned) 875 Result = Context.UnsignedInt128Ty; 876 else 877 Result = Context.Int128Ty; 878 break; 879 case DeclSpec::TST_half: Result = Context.HalfTy; break; 880 case DeclSpec::TST_float: Result = Context.FloatTy; break; 881 case DeclSpec::TST_double: 882 if (DS.getTypeSpecWidth() == DeclSpec::TSW_long) 883 Result = Context.LongDoubleTy; 884 else 885 Result = Context.DoubleTy; 886 887 if (S.getLangOpts().OpenCL && !S.getOpenCLOptions().cl_khr_fp64) { 888 S.Diag(DS.getTypeSpecTypeLoc(), diag::err_double_requires_fp64); 889 declarator.setInvalidType(true); 890 } 891 break; 892 case DeclSpec::TST_bool: Result = Context.BoolTy; break; // _Bool or bool 893 case DeclSpec::TST_decimal32: // _Decimal32 894 case DeclSpec::TST_decimal64: // _Decimal64 895 case DeclSpec::TST_decimal128: // _Decimal128 896 S.Diag(DS.getTypeSpecTypeLoc(), diag::err_decimal_unsupported); 897 Result = Context.IntTy; 898 declarator.setInvalidType(true); 899 break; 900 case DeclSpec::TST_class: 901 case DeclSpec::TST_enum: 902 case DeclSpec::TST_union: 903 case DeclSpec::TST_struct: 904 case DeclSpec::TST_interface: { 905 TypeDecl *D = dyn_cast_or_null<TypeDecl>(DS.getRepAsDecl()); 906 if (!D) { 907 // This can happen in C++ with ambiguous lookups. 908 Result = Context.IntTy; 909 declarator.setInvalidType(true); 910 break; 911 } 912 913 // If the type is deprecated or unavailable, diagnose it. 914 S.DiagnoseUseOfDecl(D, DS.getTypeSpecTypeNameLoc()); 915 916 assert(DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 && 917 DS.getTypeSpecSign() == 0 && "No qualifiers on tag names!"); 918 919 // TypeQuals handled by caller. 920 Result = Context.getTypeDeclType(D); 921 922 // In both C and C++, make an ElaboratedType. 923 ElaboratedTypeKeyword Keyword 924 = ElaboratedType::getKeywordForTypeSpec(DS.getTypeSpecType()); 925 Result = S.getElaboratedType(Keyword, DS.getTypeSpecScope(), Result); 926 break; 927 } 928 case DeclSpec::TST_typename: { 929 assert(DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 && 930 DS.getTypeSpecSign() == 0 && 931 "Can't handle qualifiers on typedef names yet!"); 932 Result = S.GetTypeFromParser(DS.getRepAsType()); 933 if (Result.isNull()) 934 declarator.setInvalidType(true); 935 else if (DeclSpec::ProtocolQualifierListTy PQ 936 = DS.getProtocolQualifiers()) { 937 if (const ObjCObjectType *ObjT = Result->getAs<ObjCObjectType>()) { 938 // Silently drop any existing protocol qualifiers. 939 // TODO: determine whether that's the right thing to do. 940 if (ObjT->getNumProtocols()) 941 Result = ObjT->getBaseType(); 942 943 if (DS.getNumProtocolQualifiers()) 944 Result = Context.getObjCObjectType(Result, 945 (ObjCProtocolDecl*const*) PQ, 946 DS.getNumProtocolQualifiers()); 947 } else if (Result->isObjCIdType()) { 948 // id<protocol-list> 949 Result = Context.getObjCObjectType(Context.ObjCBuiltinIdTy, 950 (ObjCProtocolDecl*const*) PQ, 951 DS.getNumProtocolQualifiers()); 952 Result = Context.getObjCObjectPointerType(Result); 953 } else if (Result->isObjCClassType()) { 954 // Class<protocol-list> 955 Result = Context.getObjCObjectType(Context.ObjCBuiltinClassTy, 956 (ObjCProtocolDecl*const*) PQ, 957 DS.getNumProtocolQualifiers()); 958 Result = Context.getObjCObjectPointerType(Result); 959 } else { 960 S.Diag(DeclLoc, diag::err_invalid_protocol_qualifiers) 961 << DS.getSourceRange(); 962 declarator.setInvalidType(true); 963 } 964 } 965 966 // TypeQuals handled by caller. 967 break; 968 } 969 case DeclSpec::TST_typeofType: 970 // FIXME: Preserve type source info. 971 Result = S.GetTypeFromParser(DS.getRepAsType()); 972 assert(!Result.isNull() && "Didn't get a type for typeof?"); 973 if (!Result->isDependentType()) 974 if (const TagType *TT = Result->getAs<TagType>()) 975 S.DiagnoseUseOfDecl(TT->getDecl(), DS.getTypeSpecTypeLoc()); 976 // TypeQuals handled by caller. 977 Result = Context.getTypeOfType(Result); 978 break; 979 case DeclSpec::TST_typeofExpr: { 980 Expr *E = DS.getRepAsExpr(); 981 assert(E && "Didn't get an expression for typeof?"); 982 // TypeQuals handled by caller. 983 Result = S.BuildTypeofExprType(E, DS.getTypeSpecTypeLoc()); 984 if (Result.isNull()) { 985 Result = Context.IntTy; 986 declarator.setInvalidType(true); 987 } 988 break; 989 } 990 case DeclSpec::TST_decltype: { 991 Expr *E = DS.getRepAsExpr(); 992 assert(E && "Didn't get an expression for decltype?"); 993 // TypeQuals handled by caller. 994 Result = S.BuildDecltypeType(E, DS.getTypeSpecTypeLoc()); 995 if (Result.isNull()) { 996 Result = Context.IntTy; 997 declarator.setInvalidType(true); 998 } 999 break; 1000 } 1001 case DeclSpec::TST_underlyingType: 1002 Result = S.GetTypeFromParser(DS.getRepAsType()); 1003 assert(!Result.isNull() && "Didn't get a type for __underlying_type?"); 1004 Result = S.BuildUnaryTransformType(Result, 1005 UnaryTransformType::EnumUnderlyingType, 1006 DS.getTypeSpecTypeLoc()); 1007 if (Result.isNull()) { 1008 Result = Context.IntTy; 1009 declarator.setInvalidType(true); 1010 } 1011 break; 1012 1013 case DeclSpec::TST_auto: 1014 // TypeQuals handled by caller. 1015 Result = Context.getAutoType(QualType(), /*decltype(auto)*/false); 1016 break; 1017 1018 case DeclSpec::TST_decltype_auto: 1019 Result = Context.getAutoType(QualType(), /*decltype(auto)*/true); 1020 break; 1021 1022 case DeclSpec::TST_unknown_anytype: 1023 Result = Context.UnknownAnyTy; 1024 break; 1025 1026 case DeclSpec::TST_atomic: 1027 Result = S.GetTypeFromParser(DS.getRepAsType()); 1028 assert(!Result.isNull() && "Didn't get a type for _Atomic?"); 1029 Result = S.BuildAtomicType(Result, DS.getTypeSpecTypeLoc()); 1030 if (Result.isNull()) { 1031 Result = Context.IntTy; 1032 declarator.setInvalidType(true); 1033 } 1034 break; 1035 1036 case DeclSpec::TST_image1d_t: 1037 Result = Context.OCLImage1dTy; 1038 break; 1039 1040 case DeclSpec::TST_image1d_array_t: 1041 Result = Context.OCLImage1dArrayTy; 1042 break; 1043 1044 case DeclSpec::TST_image1d_buffer_t: 1045 Result = Context.OCLImage1dBufferTy; 1046 break; 1047 1048 case DeclSpec::TST_image2d_t: 1049 Result = Context.OCLImage2dTy; 1050 break; 1051 1052 case DeclSpec::TST_image2d_array_t: 1053 Result = Context.OCLImage2dArrayTy; 1054 break; 1055 1056 case DeclSpec::TST_image3d_t: 1057 Result = Context.OCLImage3dTy; 1058 break; 1059 1060 case DeclSpec::TST_sampler_t: 1061 Result = Context.OCLSamplerTy; 1062 break; 1063 1064 case DeclSpec::TST_event_t: 1065 Result = Context.OCLEventTy; 1066 break; 1067 1068 case DeclSpec::TST_error: 1069 Result = Context.IntTy; 1070 declarator.setInvalidType(true); 1071 break; 1072 } 1073 1074 // Handle complex types. 1075 if (DS.getTypeSpecComplex() == DeclSpec::TSC_complex) { 1076 if (S.getLangOpts().Freestanding) 1077 S.Diag(DS.getTypeSpecComplexLoc(), diag::ext_freestanding_complex); 1078 Result = Context.getComplexType(Result); 1079 } else if (DS.isTypeAltiVecVector()) { 1080 unsigned typeSize = static_cast<unsigned>(Context.getTypeSize(Result)); 1081 assert(typeSize > 0 && "type size for vector must be greater than 0 bits"); 1082 VectorType::VectorKind VecKind = VectorType::AltiVecVector; 1083 if (DS.isTypeAltiVecPixel()) 1084 VecKind = VectorType::AltiVecPixel; 1085 else if (DS.isTypeAltiVecBool()) 1086 VecKind = VectorType::AltiVecBool; 1087 Result = Context.getVectorType(Result, 128/typeSize, VecKind); 1088 } 1089 1090 // FIXME: Imaginary. 1091 if (DS.getTypeSpecComplex() == DeclSpec::TSC_imaginary) 1092 S.Diag(DS.getTypeSpecComplexLoc(), diag::err_imaginary_not_supported); 1093 1094 // Before we process any type attributes, synthesize a block literal 1095 // function declarator if necessary. 1096 if (declarator.getContext() == Declarator::BlockLiteralContext) 1097 maybeSynthesizeBlockSignature(state, Result); 1098 1099 // Apply any type attributes from the decl spec. This may cause the 1100 // list of type attributes to be temporarily saved while the type 1101 // attributes are pushed around. 1102 if (AttributeList *attrs = DS.getAttributes().getList()) 1103 processTypeAttrs(state, Result, TAL_DeclSpec, attrs); 1104 1105 // Apply const/volatile/restrict qualifiers to T. 1106 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 1107 1108 // Warn about CV qualifiers on functions: C99 6.7.3p8: "If the specification 1109 // of a function type includes any type qualifiers, the behavior is 1110 // undefined." 1111 if (Result->isFunctionType() && TypeQuals) { 1112 if (TypeQuals & DeclSpec::TQ_const) 1113 S.Diag(DS.getConstSpecLoc(), diag::warn_typecheck_function_qualifiers) 1114 << Result << DS.getSourceRange(); 1115 else if (TypeQuals & DeclSpec::TQ_volatile) 1116 S.Diag(DS.getVolatileSpecLoc(), diag::warn_typecheck_function_qualifiers) 1117 << Result << DS.getSourceRange(); 1118 else { 1119 assert((TypeQuals & (DeclSpec::TQ_restrict | DeclSpec::TQ_atomic)) && 1120 "Has CVRA quals but not C, V, R, or A?"); 1121 // No diagnostic; we'll diagnose 'restrict' or '_Atomic' applied to a 1122 // function type later, in BuildQualifiedType. 1123 } 1124 } 1125 1126 // C++ [dcl.ref]p1: 1127 // Cv-qualified references are ill-formed except when the 1128 // cv-qualifiers are introduced through the use of a typedef 1129 // (7.1.3) or of a template type argument (14.3), in which 1130 // case the cv-qualifiers are ignored. 1131 // FIXME: Shouldn't we be checking SCS_typedef here? 1132 if (DS.getTypeSpecType() == DeclSpec::TST_typename && 1133 TypeQuals && Result->isReferenceType()) { 1134 TypeQuals &= ~DeclSpec::TQ_const; 1135 TypeQuals &= ~DeclSpec::TQ_volatile; 1136 TypeQuals &= ~DeclSpec::TQ_atomic; 1137 } 1138 1139 // C90 6.5.3 constraints: "The same type qualifier shall not appear more 1140 // than once in the same specifier-list or qualifier-list, either directly 1141 // or via one or more typedefs." 1142 if (!S.getLangOpts().C99 && !S.getLangOpts().CPlusPlus 1143 && TypeQuals & Result.getCVRQualifiers()) { 1144 if (TypeQuals & DeclSpec::TQ_const && Result.isConstQualified()) { 1145 S.Diag(DS.getConstSpecLoc(), diag::ext_duplicate_declspec) 1146 << "const"; 1147 } 1148 1149 if (TypeQuals & DeclSpec::TQ_volatile && Result.isVolatileQualified()) { 1150 S.Diag(DS.getVolatileSpecLoc(), diag::ext_duplicate_declspec) 1151 << "volatile"; 1152 } 1153 1154 // C90 doesn't have restrict nor _Atomic, so it doesn't force us to 1155 // produce a warning in this case. 1156 } 1157 1158 QualType Qualified = S.BuildQualifiedType(Result, DeclLoc, TypeQuals, &DS); 1159 1160 // If adding qualifiers fails, just use the unqualified type. 1161 if (Qualified.isNull()) 1162 declarator.setInvalidType(true); 1163 else 1164 Result = Qualified; 1165 } 1166 1167 return Result; 1168} 1169 1170static std::string getPrintableNameForEntity(DeclarationName Entity) { 1171 if (Entity) 1172 return Entity.getAsString(); 1173 1174 return "type name"; 1175} 1176 1177QualType Sema::BuildQualifiedType(QualType T, SourceLocation Loc, 1178 Qualifiers Qs, const DeclSpec *DS) { 1179 // Enforce C99 6.7.3p2: "Types other than pointer types derived from 1180 // object or incomplete types shall not be restrict-qualified." 1181 if (Qs.hasRestrict()) { 1182 unsigned DiagID = 0; 1183 QualType ProblemTy; 1184 1185 if (T->isAnyPointerType() || T->isReferenceType() || 1186 T->isMemberPointerType()) { 1187 QualType EltTy; 1188 if (T->isObjCObjectPointerType()) 1189 EltTy = T; 1190 else if (const MemberPointerType *PTy = T->getAs<MemberPointerType>()) 1191 EltTy = PTy->getPointeeType(); 1192 else 1193 EltTy = T->getPointeeType(); 1194 1195 // If we have a pointer or reference, the pointee must have an object 1196 // incomplete type. 1197 if (!EltTy->isIncompleteOrObjectType()) { 1198 DiagID = diag::err_typecheck_invalid_restrict_invalid_pointee; 1199 ProblemTy = EltTy; 1200 } 1201 } else if (!T->isDependentType()) { 1202 DiagID = diag::err_typecheck_invalid_restrict_not_pointer; 1203 ProblemTy = T; 1204 } 1205 1206 if (DiagID) { 1207 Diag(DS ? DS->getRestrictSpecLoc() : Loc, DiagID) << ProblemTy; 1208 Qs.removeRestrict(); 1209 } 1210 } 1211 1212 return Context.getQualifiedType(T, Qs); 1213} 1214 1215QualType Sema::BuildQualifiedType(QualType T, SourceLocation Loc, 1216 unsigned CVRA, const DeclSpec *DS) { 1217 // Convert from DeclSpec::TQ to Qualifiers::TQ by just dropping TQ_atomic. 1218 unsigned CVR = CVRA & ~DeclSpec::TQ_atomic; 1219 1220 // C11 6.7.3/5: 1221 // If the same qualifier appears more than once in the same 1222 // specifier-qualifier-list, either directly or via one or more typedefs, 1223 // the behavior is the same as if it appeared only once. 1224 // 1225 // It's not specified what happens when the _Atomic qualifier is applied to 1226 // a type specified with the _Atomic specifier, but we assume that this 1227 // should be treated as if the _Atomic qualifier appeared multiple times. 1228 if (CVRA & DeclSpec::TQ_atomic && !T->isAtomicType()) { 1229 // C11 6.7.3/5: 1230 // If other qualifiers appear along with the _Atomic qualifier in a 1231 // specifier-qualifier-list, the resulting type is the so-qualified 1232 // atomic type. 1233 // 1234 // Don't need to worry about array types here, since _Atomic can't be 1235 // applied to such types. 1236 SplitQualType Split = T.getSplitUnqualifiedType(); 1237 T = BuildAtomicType(QualType(Split.Ty, 0), 1238 DS ? DS->getAtomicSpecLoc() : Loc); 1239 if (T.isNull()) 1240 return T; 1241 Split.Quals.addCVRQualifiers(CVR); 1242 return BuildQualifiedType(T, Loc, Split.Quals); 1243 } 1244 1245 return BuildQualifiedType(T, Loc, Qualifiers::fromCVRMask(CVR), DS); 1246} 1247 1248/// \brief Build a paren type including \p T. 1249QualType Sema::BuildParenType(QualType T) { 1250 return Context.getParenType(T); 1251} 1252 1253/// Given that we're building a pointer or reference to the given 1254static QualType inferARCLifetimeForPointee(Sema &S, QualType type, 1255 SourceLocation loc, 1256 bool isReference) { 1257 // Bail out if retention is unrequired or already specified. 1258 if (!type->isObjCLifetimeType() || 1259 type.getObjCLifetime() != Qualifiers::OCL_None) 1260 return type; 1261 1262 Qualifiers::ObjCLifetime implicitLifetime = Qualifiers::OCL_None; 1263 1264 // If the object type is const-qualified, we can safely use 1265 // __unsafe_unretained. This is safe (because there are no read 1266 // barriers), and it'll be safe to coerce anything but __weak* to 1267 // the resulting type. 1268 if (type.isConstQualified()) { 1269 implicitLifetime = Qualifiers::OCL_ExplicitNone; 1270 1271 // Otherwise, check whether the static type does not require 1272 // retaining. This currently only triggers for Class (possibly 1273 // protocol-qualifed, and arrays thereof). 1274 } else if (type->isObjCARCImplicitlyUnretainedType()) { 1275 implicitLifetime = Qualifiers::OCL_ExplicitNone; 1276 1277 // If we are in an unevaluated context, like sizeof, skip adding a 1278 // qualification. 1279 } else if (S.isUnevaluatedContext()) { 1280 return type; 1281 1282 // If that failed, give an error and recover using __strong. __strong 1283 // is the option most likely to prevent spurious second-order diagnostics, 1284 // like when binding a reference to a field. 1285 } else { 1286 // These types can show up in private ivars in system headers, so 1287 // we need this to not be an error in those cases. Instead we 1288 // want to delay. 1289 if (S.DelayedDiagnostics.shouldDelayDiagnostics()) { 1290 S.DelayedDiagnostics.add( 1291 sema::DelayedDiagnostic::makeForbiddenType(loc, 1292 diag::err_arc_indirect_no_ownership, type, isReference)); 1293 } else { 1294 S.Diag(loc, diag::err_arc_indirect_no_ownership) << type << isReference; 1295 } 1296 implicitLifetime = Qualifiers::OCL_Strong; 1297 } 1298 assert(implicitLifetime && "didn't infer any lifetime!"); 1299 1300 Qualifiers qs; 1301 qs.addObjCLifetime(implicitLifetime); 1302 return S.Context.getQualifiedType(type, qs); 1303} 1304 1305/// \brief Build a pointer type. 1306/// 1307/// \param T The type to which we'll be building a pointer. 1308/// 1309/// \param Loc The location of the entity whose type involves this 1310/// pointer type or, if there is no such entity, the location of the 1311/// type that will have pointer type. 1312/// 1313/// \param Entity The name of the entity that involves the pointer 1314/// type, if known. 1315/// 1316/// \returns A suitable pointer type, if there are no 1317/// errors. Otherwise, returns a NULL type. 1318QualType Sema::BuildPointerType(QualType T, 1319 SourceLocation Loc, DeclarationName Entity) { 1320 if (T->isReferenceType()) { 1321 // C++ 8.3.2p4: There shall be no ... pointers to references ... 1322 Diag(Loc, diag::err_illegal_decl_pointer_to_reference) 1323 << getPrintableNameForEntity(Entity) << T; 1324 return QualType(); 1325 } 1326 1327 assert(!T->isObjCObjectType() && "Should build ObjCObjectPointerType"); 1328 1329 // In ARC, it is forbidden to build pointers to unqualified pointers. 1330 if (getLangOpts().ObjCAutoRefCount) 1331 T = inferARCLifetimeForPointee(*this, T, Loc, /*reference*/ false); 1332 1333 // Build the pointer type. 1334 return Context.getPointerType(T); 1335} 1336 1337/// \brief Build a reference type. 1338/// 1339/// \param T The type to which we'll be building a reference. 1340/// 1341/// \param Loc The location of the entity whose type involves this 1342/// reference type or, if there is no such entity, the location of the 1343/// type that will have reference type. 1344/// 1345/// \param Entity The name of the entity that involves the reference 1346/// type, if known. 1347/// 1348/// \returns A suitable reference type, if there are no 1349/// errors. Otherwise, returns a NULL type. 1350QualType Sema::BuildReferenceType(QualType T, bool SpelledAsLValue, 1351 SourceLocation Loc, 1352 DeclarationName Entity) { 1353 assert(Context.getCanonicalType(T) != Context.OverloadTy && 1354 "Unresolved overloaded function type"); 1355 1356 // C++0x [dcl.ref]p6: 1357 // If a typedef (7.1.3), a type template-parameter (14.3.1), or a 1358 // decltype-specifier (7.1.6.2) denotes a type TR that is a reference to a 1359 // type T, an attempt to create the type "lvalue reference to cv TR" creates 1360 // the type "lvalue reference to T", while an attempt to create the type 1361 // "rvalue reference to cv TR" creates the type TR. 1362 bool LValueRef = SpelledAsLValue || T->getAs<LValueReferenceType>(); 1363 1364 // C++ [dcl.ref]p4: There shall be no references to references. 1365 // 1366 // According to C++ DR 106, references to references are only 1367 // diagnosed when they are written directly (e.g., "int & &"), 1368 // but not when they happen via a typedef: 1369 // 1370 // typedef int& intref; 1371 // typedef intref& intref2; 1372 // 1373 // Parser::ParseDeclaratorInternal diagnoses the case where 1374 // references are written directly; here, we handle the 1375 // collapsing of references-to-references as described in C++0x. 1376 // DR 106 and 540 introduce reference-collapsing into C++98/03. 1377 1378 // C++ [dcl.ref]p1: 1379 // A declarator that specifies the type "reference to cv void" 1380 // is ill-formed. 1381 if (T->isVoidType()) { 1382 Diag(Loc, diag::err_reference_to_void); 1383 return QualType(); 1384 } 1385 1386 // In ARC, it is forbidden to build references to unqualified pointers. 1387 if (getLangOpts().ObjCAutoRefCount) 1388 T = inferARCLifetimeForPointee(*this, T, Loc, /*reference*/ true); 1389 1390 // Handle restrict on references. 1391 if (LValueRef) 1392 return Context.getLValueReferenceType(T, SpelledAsLValue); 1393 return Context.getRValueReferenceType(T); 1394} 1395 1396/// Check whether the specified array size makes the array type a VLA. If so, 1397/// return true, if not, return the size of the array in SizeVal. 1398static bool isArraySizeVLA(Sema &S, Expr *ArraySize, llvm::APSInt &SizeVal) { 1399 // If the size is an ICE, it certainly isn't a VLA. If we're in a GNU mode 1400 // (like gnu99, but not c99) accept any evaluatable value as an extension. 1401 class VLADiagnoser : public Sema::VerifyICEDiagnoser { 1402 public: 1403 VLADiagnoser() : Sema::VerifyICEDiagnoser(true) {} 1404 1405 virtual void diagnoseNotICE(Sema &S, SourceLocation Loc, SourceRange SR) { 1406 } 1407 1408 virtual void diagnoseFold(Sema &S, SourceLocation Loc, SourceRange SR) { 1409 S.Diag(Loc, diag::ext_vla_folded_to_constant) << SR; 1410 } 1411 } Diagnoser; 1412 1413 return S.VerifyIntegerConstantExpression(ArraySize, &SizeVal, Diagnoser, 1414 S.LangOpts.GNUMode).isInvalid(); 1415} 1416 1417 1418/// \brief Build an array type. 1419/// 1420/// \param T The type of each element in the array. 1421/// 1422/// \param ASM C99 array size modifier (e.g., '*', 'static'). 1423/// 1424/// \param ArraySize Expression describing the size of the array. 1425/// 1426/// \param Brackets The range from the opening '[' to the closing ']'. 1427/// 1428/// \param Entity The name of the entity that involves the array 1429/// type, if known. 1430/// 1431/// \returns A suitable array type, if there are no errors. Otherwise, 1432/// returns a NULL type. 1433QualType Sema::BuildArrayType(QualType T, ArrayType::ArraySizeModifier ASM, 1434 Expr *ArraySize, unsigned Quals, 1435 SourceRange Brackets, DeclarationName Entity) { 1436 1437 SourceLocation Loc = Brackets.getBegin(); 1438 if (getLangOpts().CPlusPlus) { 1439 // C++ [dcl.array]p1: 1440 // T is called the array element type; this type shall not be a reference 1441 // type, the (possibly cv-qualified) type void, a function type or an 1442 // abstract class type. 1443 // 1444 // C++ [dcl.array]p3: 1445 // When several "array of" specifications are adjacent, [...] only the 1446 // first of the constant expressions that specify the bounds of the arrays 1447 // may be omitted. 1448 // 1449 // Note: function types are handled in the common path with C. 1450 if (T->isReferenceType()) { 1451 Diag(Loc, diag::err_illegal_decl_array_of_references) 1452 << getPrintableNameForEntity(Entity) << T; 1453 return QualType(); 1454 } 1455 1456 if (T->isVoidType() || T->isIncompleteArrayType()) { 1457 Diag(Loc, diag::err_illegal_decl_array_incomplete_type) << T; 1458 return QualType(); 1459 } 1460 1461 if (RequireNonAbstractType(Brackets.getBegin(), T, 1462 diag::err_array_of_abstract_type)) 1463 return QualType(); 1464 1465 } else { 1466 // C99 6.7.5.2p1: If the element type is an incomplete or function type, 1467 // reject it (e.g. void ary[7], struct foo ary[7], void ary[7]()) 1468 if (RequireCompleteType(Loc, T, 1469 diag::err_illegal_decl_array_incomplete_type)) 1470 return QualType(); 1471 } 1472 1473 if (T->isFunctionType()) { 1474 Diag(Loc, diag::err_illegal_decl_array_of_functions) 1475 << getPrintableNameForEntity(Entity) << T; 1476 return QualType(); 1477 } 1478 1479 if (const RecordType *EltTy = T->getAs<RecordType>()) { 1480 // If the element type is a struct or union that contains a variadic 1481 // array, accept it as a GNU extension: C99 6.7.2.1p2. 1482 if (EltTy->getDecl()->hasFlexibleArrayMember()) 1483 Diag(Loc, diag::ext_flexible_array_in_array) << T; 1484 } else if (T->isObjCObjectType()) { 1485 Diag(Loc, diag::err_objc_array_of_interfaces) << T; 1486 return QualType(); 1487 } 1488 1489 // Do placeholder conversions on the array size expression. 1490 if (ArraySize && ArraySize->hasPlaceholderType()) { 1491 ExprResult Result = CheckPlaceholderExpr(ArraySize); 1492 if (Result.isInvalid()) return QualType(); 1493 ArraySize = Result.take(); 1494 } 1495 1496 // Do lvalue-to-rvalue conversions on the array size expression. 1497 if (ArraySize && !ArraySize->isRValue()) { 1498 ExprResult Result = DefaultLvalueConversion(ArraySize); 1499 if (Result.isInvalid()) 1500 return QualType(); 1501 1502 ArraySize = Result.take(); 1503 } 1504 1505 // C99 6.7.5.2p1: The size expression shall have integer type. 1506 // C++11 allows contextual conversions to such types. 1507 if (!getLangOpts().CPlusPlus11 && 1508 ArraySize && !ArraySize->isTypeDependent() && 1509 !ArraySize->getType()->isIntegralOrUnscopedEnumerationType()) { 1510 Diag(ArraySize->getLocStart(), diag::err_array_size_non_int) 1511 << ArraySize->getType() << ArraySize->getSourceRange(); 1512 return QualType(); 1513 } 1514 1515 llvm::APSInt ConstVal(Context.getTypeSize(Context.getSizeType())); 1516 if (!ArraySize) { 1517 if (ASM == ArrayType::Star) 1518 T = Context.getVariableArrayType(T, 0, ASM, Quals, Brackets); 1519 else 1520 T = Context.getIncompleteArrayType(T, ASM, Quals); 1521 } else if (ArraySize->isTypeDependent() || ArraySize->isValueDependent()) { 1522 T = Context.getDependentSizedArrayType(T, ArraySize, ASM, Quals, Brackets); 1523 } else if ((!T->isDependentType() && !T->isIncompleteType() && 1524 !T->isConstantSizeType()) || 1525 isArraySizeVLA(*this, ArraySize, ConstVal)) { 1526 // Even in C++11, don't allow contextual conversions in the array bound 1527 // of a VLA. 1528 if (getLangOpts().CPlusPlus11 && 1529 !ArraySize->getType()->isIntegralOrUnscopedEnumerationType()) { 1530 Diag(ArraySize->getLocStart(), diag::err_array_size_non_int) 1531 << ArraySize->getType() << ArraySize->getSourceRange(); 1532 return QualType(); 1533 } 1534 1535 // C99: an array with an element type that has a non-constant-size is a VLA. 1536 // C99: an array with a non-ICE size is a VLA. We accept any expression 1537 // that we can fold to a non-zero positive value as an extension. 1538 T = Context.getVariableArrayType(T, ArraySize, ASM, Quals, Brackets); 1539 } else { 1540 // C99 6.7.5.2p1: If the expression is a constant expression, it shall 1541 // have a value greater than zero. 1542 if (ConstVal.isSigned() && ConstVal.isNegative()) { 1543 if (Entity) 1544 Diag(ArraySize->getLocStart(), diag::err_decl_negative_array_size) 1545 << getPrintableNameForEntity(Entity) << ArraySize->getSourceRange(); 1546 else 1547 Diag(ArraySize->getLocStart(), diag::err_typecheck_negative_array_size) 1548 << ArraySize->getSourceRange(); 1549 return QualType(); 1550 } 1551 if (ConstVal == 0) { 1552 // GCC accepts zero sized static arrays. We allow them when 1553 // we're not in a SFINAE context. 1554 Diag(ArraySize->getLocStart(), 1555 isSFINAEContext()? diag::err_typecheck_zero_array_size 1556 : diag::ext_typecheck_zero_array_size) 1557 << ArraySize->getSourceRange(); 1558 1559 if (ASM == ArrayType::Static) { 1560 Diag(ArraySize->getLocStart(), 1561 diag::warn_typecheck_zero_static_array_size) 1562 << ArraySize->getSourceRange(); 1563 ASM = ArrayType::Normal; 1564 } 1565 } else if (!T->isDependentType() && !T->isVariablyModifiedType() && 1566 !T->isIncompleteType()) { 1567 // Is the array too large? 1568 unsigned ActiveSizeBits 1569 = ConstantArrayType::getNumAddressingBits(Context, T, ConstVal); 1570 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) { 1571 Diag(ArraySize->getLocStart(), diag::err_array_too_large) 1572 << ConstVal.toString(10) 1573 << ArraySize->getSourceRange(); 1574 return QualType(); 1575 } 1576 } 1577 1578 T = Context.getConstantArrayType(T, ConstVal, ASM, Quals); 1579 } 1580 1581 // OpenCL v1.2 s6.9.d: variable length arrays are not supported. 1582 if (getLangOpts().OpenCL && T->isVariableArrayType()) { 1583 Diag(Loc, diag::err_opencl_vla); 1584 return QualType(); 1585 } 1586 // If this is not C99, extwarn about VLA's and C99 array size modifiers. 1587 if (!getLangOpts().C99) { 1588 if (T->isVariableArrayType()) { 1589 // Prohibit the use of non-POD types in VLAs. 1590 // FIXME: C++1y allows this. 1591 QualType BaseT = Context.getBaseElementType(T); 1592 if (!T->isDependentType() && 1593 !BaseT.isPODType(Context) && 1594 !BaseT->isObjCLifetimeType()) { 1595 Diag(Loc, diag::err_vla_non_pod) 1596 << BaseT; 1597 return QualType(); 1598 } 1599 // Prohibit the use of VLAs during template argument deduction. 1600 else if (isSFINAEContext()) { 1601 Diag(Loc, diag::err_vla_in_sfinae); 1602 return QualType(); 1603 } 1604 // Just extwarn about VLAs. 1605 else 1606 Diag(Loc, getLangOpts().CPlusPlus1y 1607 ? diag::warn_cxx11_compat_array_of_runtime_bound 1608 : diag::ext_vla); 1609 } else if (ASM != ArrayType::Normal || Quals != 0) 1610 Diag(Loc, 1611 getLangOpts().CPlusPlus? diag::err_c99_array_usage_cxx 1612 : diag::ext_c99_array_usage) << ASM; 1613 } 1614 1615 if (T->isVariableArrayType()) { 1616 // Warn about VLAs for -Wvla. 1617 Diag(Loc, diag::warn_vla_used); 1618 } 1619 1620 return T; 1621} 1622 1623/// \brief Build an ext-vector type. 1624/// 1625/// Run the required checks for the extended vector type. 1626QualType Sema::BuildExtVectorType(QualType T, Expr *ArraySize, 1627 SourceLocation AttrLoc) { 1628 // unlike gcc's vector_size attribute, we do not allow vectors to be defined 1629 // in conjunction with complex types (pointers, arrays, functions, etc.). 1630 if (!T->isDependentType() && 1631 !T->isIntegerType() && !T->isRealFloatingType()) { 1632 Diag(AttrLoc, diag::err_attribute_invalid_vector_type) << T; 1633 return QualType(); 1634 } 1635 1636 if (!ArraySize->isTypeDependent() && !ArraySize->isValueDependent()) { 1637 llvm::APSInt vecSize(32); 1638 if (!ArraySize->isIntegerConstantExpr(vecSize, Context)) { 1639 Diag(AttrLoc, diag::err_attribute_argument_not_int) 1640 << "ext_vector_type" << ArraySize->getSourceRange(); 1641 return QualType(); 1642 } 1643 1644 // unlike gcc's vector_size attribute, the size is specified as the 1645 // number of elements, not the number of bytes. 1646 unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue()); 1647 1648 if (vectorSize == 0) { 1649 Diag(AttrLoc, diag::err_attribute_zero_size) 1650 << ArraySize->getSourceRange(); 1651 return QualType(); 1652 } 1653 1654 return Context.getExtVectorType(T, vectorSize); 1655 } 1656 1657 return Context.getDependentSizedExtVectorType(T, ArraySize, AttrLoc); 1658} 1659 1660bool Sema::CheckFunctionReturnType(QualType T, SourceLocation Loc) { 1661 if (T->isArrayType() || T->isFunctionType()) { 1662 Diag(Loc, diag::err_func_returning_array_function) 1663 << T->isFunctionType() << T; 1664 return true; 1665 } 1666 1667 // Functions cannot return half FP. 1668 if (T->isHalfType()) { 1669 Diag(Loc, diag::err_parameters_retval_cannot_have_fp16_type) << 1 << 1670 FixItHint::CreateInsertion(Loc, "*"); 1671 return true; 1672 } 1673 1674 // Methods cannot return interface types. All ObjC objects are 1675 // passed by reference. 1676 if (T->isObjCObjectType()) { 1677 Diag(Loc, diag::err_object_cannot_be_passed_returned_by_value) << 0 << T; 1678 return 0; 1679 } 1680 1681 return false; 1682} 1683 1684QualType Sema::BuildFunctionType(QualType T, 1685 llvm::MutableArrayRef<QualType> ParamTypes, 1686 SourceLocation Loc, DeclarationName Entity, 1687 const FunctionProtoType::ExtProtoInfo &EPI) { 1688 bool Invalid = false; 1689 1690 Invalid |= CheckFunctionReturnType(T, Loc); 1691 1692 for (unsigned Idx = 0, Cnt = ParamTypes.size(); Idx < Cnt; ++Idx) { 1693 // FIXME: Loc is too inprecise here, should use proper locations for args. 1694 QualType ParamType = Context.getAdjustedParameterType(ParamTypes[Idx]); 1695 if (ParamType->isVoidType()) { 1696 Diag(Loc, diag::err_param_with_void_type); 1697 Invalid = true; 1698 } else if (ParamType->isHalfType()) { 1699 // Disallow half FP arguments. 1700 Diag(Loc, diag::err_parameters_retval_cannot_have_fp16_type) << 0 << 1701 FixItHint::CreateInsertion(Loc, "*"); 1702 Invalid = true; 1703 } 1704 1705 ParamTypes[Idx] = ParamType; 1706 } 1707 1708 if (Invalid) 1709 return QualType(); 1710 1711 return Context.getFunctionType(T, ParamTypes, EPI); 1712} 1713 1714/// \brief Build a member pointer type \c T Class::*. 1715/// 1716/// \param T the type to which the member pointer refers. 1717/// \param Class the class type into which the member pointer points. 1718/// \param Loc the location where this type begins 1719/// \param Entity the name of the entity that will have this member pointer type 1720/// 1721/// \returns a member pointer type, if successful, or a NULL type if there was 1722/// an error. 1723QualType Sema::BuildMemberPointerType(QualType T, QualType Class, 1724 SourceLocation Loc, 1725 DeclarationName Entity) { 1726 // Verify that we're not building a pointer to pointer to function with 1727 // exception specification. 1728 if (CheckDistantExceptionSpec(T)) { 1729 Diag(Loc, diag::err_distant_exception_spec); 1730 1731 // FIXME: If we're doing this as part of template instantiation, 1732 // we should return immediately. 1733 1734 // Build the type anyway, but use the canonical type so that the 1735 // exception specifiers are stripped off. 1736 T = Context.getCanonicalType(T); 1737 } 1738 1739 // C++ 8.3.3p3: A pointer to member shall not point to ... a member 1740 // with reference type, or "cv void." 1741 if (T->isReferenceType()) { 1742 Diag(Loc, diag::err_illegal_decl_mempointer_to_reference) 1743 << (Entity? Entity.getAsString() : "type name") << T; 1744 return QualType(); 1745 } 1746 1747 if (T->isVoidType()) { 1748 Diag(Loc, diag::err_illegal_decl_mempointer_to_void) 1749 << (Entity? Entity.getAsString() : "type name"); 1750 return QualType(); 1751 } 1752 1753 if (!Class->isDependentType() && !Class->isRecordType()) { 1754 Diag(Loc, diag::err_mempointer_in_nonclass_type) << Class; 1755 return QualType(); 1756 } 1757 1758 // C++ allows the class type in a member pointer to be an incomplete type. 1759 // In the Microsoft ABI, the size of the member pointer can vary 1760 // according to the class type, which means that we really need a 1761 // complete type if possible, which means we need to instantiate templates. 1762 // 1763 // If template instantiation fails or the type is just incomplete, we have to 1764 // add an extra slot to the member pointer. Yes, this does cause problems 1765 // when passing pointers between TUs that disagree about the size. 1766 if (Context.getTargetInfo().getCXXABI().isMicrosoft()) { 1767 CXXRecordDecl *RD = Class->getAsCXXRecordDecl(); 1768 if (RD && !RD->hasAttr<MSInheritanceAttr>()) { 1769 // Lock in the inheritance model on the first use of a member pointer. 1770 // Otherwise we may disagree about the size at different points in the TU. 1771 // FIXME: MSVC picks a model on the first use that needs to know the size, 1772 // rather than on the first mention of the type, e.g. typedefs. 1773 if (RequireCompleteType(Loc, Class, 0) && !RD->isBeingDefined()) { 1774 // We know it doesn't have an attribute and it's incomplete, so use the 1775 // unspecified inheritance model. If we're in the record body, we can 1776 // figure out the inheritance model. 1777 for (CXXRecordDecl::redecl_iterator I = RD->redecls_begin(), 1778 E = RD->redecls_end(); I != E; ++I) { 1779 I->addAttr(::new (Context) UnspecifiedInheritanceAttr( 1780 RD->getSourceRange(), Context)); 1781 } 1782 } 1783 } 1784 } 1785 1786 return Context.getMemberPointerType(T, Class.getTypePtr()); 1787} 1788 1789/// \brief Build a block pointer type. 1790/// 1791/// \param T The type to which we'll be building a block pointer. 1792/// 1793/// \param Loc The source location, used for diagnostics. 1794/// 1795/// \param Entity The name of the entity that involves the block pointer 1796/// type, if known. 1797/// 1798/// \returns A suitable block pointer type, if there are no 1799/// errors. Otherwise, returns a NULL type. 1800QualType Sema::BuildBlockPointerType(QualType T, 1801 SourceLocation Loc, 1802 DeclarationName Entity) { 1803 if (!T->isFunctionType()) { 1804 Diag(Loc, diag::err_nonfunction_block_type); 1805 return QualType(); 1806 } 1807 1808 return Context.getBlockPointerType(T); 1809} 1810 1811QualType Sema::GetTypeFromParser(ParsedType Ty, TypeSourceInfo **TInfo) { 1812 QualType QT = Ty.get(); 1813 if (QT.isNull()) { 1814 if (TInfo) *TInfo = 0; 1815 return QualType(); 1816 } 1817 1818 TypeSourceInfo *DI = 0; 1819 if (const LocInfoType *LIT = dyn_cast<LocInfoType>(QT)) { 1820 QT = LIT->getType(); 1821 DI = LIT->getTypeSourceInfo(); 1822 } 1823 1824 if (TInfo) *TInfo = DI; 1825 return QT; 1826} 1827 1828static void transferARCOwnershipToDeclaratorChunk(TypeProcessingState &state, 1829 Qualifiers::ObjCLifetime ownership, 1830 unsigned chunkIndex); 1831 1832/// Given that this is the declaration of a parameter under ARC, 1833/// attempt to infer attributes and such for pointer-to-whatever 1834/// types. 1835static void inferARCWriteback(TypeProcessingState &state, 1836 QualType &declSpecType) { 1837 Sema &S = state.getSema(); 1838 Declarator &declarator = state.getDeclarator(); 1839 1840 // TODO: should we care about decl qualifiers? 1841 1842 // Check whether the declarator has the expected form. We walk 1843 // from the inside out in order to make the block logic work. 1844 unsigned outermostPointerIndex = 0; 1845 bool isBlockPointer = false; 1846 unsigned numPointers = 0; 1847 for (unsigned i = 0, e = declarator.getNumTypeObjects(); i != e; ++i) { 1848 unsigned chunkIndex = i; 1849 DeclaratorChunk &chunk = declarator.getTypeObject(chunkIndex); 1850 switch (chunk.Kind) { 1851 case DeclaratorChunk::Paren: 1852 // Ignore parens. 1853 break; 1854 1855 case DeclaratorChunk::Reference: 1856 case DeclaratorChunk::Pointer: 1857 // Count the number of pointers. Treat references 1858 // interchangeably as pointers; if they're mis-ordered, normal 1859 // type building will discover that. 1860 outermostPointerIndex = chunkIndex; 1861 numPointers++; 1862 break; 1863 1864 case DeclaratorChunk::BlockPointer: 1865 // If we have a pointer to block pointer, that's an acceptable 1866 // indirect reference; anything else is not an application of 1867 // the rules. 1868 if (numPointers != 1) return; 1869 numPointers++; 1870 outermostPointerIndex = chunkIndex; 1871 isBlockPointer = true; 1872 1873 // We don't care about pointer structure in return values here. 1874 goto done; 1875 1876 case DeclaratorChunk::Array: // suppress if written (id[])? 1877 case DeclaratorChunk::Function: 1878 case DeclaratorChunk::MemberPointer: 1879 return; 1880 } 1881 } 1882 done: 1883 1884 // If we have *one* pointer, then we want to throw the qualifier on 1885 // the declaration-specifiers, which means that it needs to be a 1886 // retainable object type. 1887 if (numPointers == 1) { 1888 // If it's not a retainable object type, the rule doesn't apply. 1889 if (!declSpecType->isObjCRetainableType()) return; 1890 1891 // If it already has lifetime, don't do anything. 1892 if (declSpecType.getObjCLifetime()) return; 1893 1894 // Otherwise, modify the type in-place. 1895 Qualifiers qs; 1896 1897 if (declSpecType->isObjCARCImplicitlyUnretainedType()) 1898 qs.addObjCLifetime(Qualifiers::OCL_ExplicitNone); 1899 else 1900 qs.addObjCLifetime(Qualifiers::OCL_Autoreleasing); 1901 declSpecType = S.Context.getQualifiedType(declSpecType, qs); 1902 1903 // If we have *two* pointers, then we want to throw the qualifier on 1904 // the outermost pointer. 1905 } else if (numPointers == 2) { 1906 // If we don't have a block pointer, we need to check whether the 1907 // declaration-specifiers gave us something that will turn into a 1908 // retainable object pointer after we slap the first pointer on it. 1909 if (!isBlockPointer && !declSpecType->isObjCObjectType()) 1910 return; 1911 1912 // Look for an explicit lifetime attribute there. 1913 DeclaratorChunk &chunk = declarator.getTypeObject(outermostPointerIndex); 1914 if (chunk.Kind != DeclaratorChunk::Pointer && 1915 chunk.Kind != DeclaratorChunk::BlockPointer) 1916 return; 1917 for (const AttributeList *attr = chunk.getAttrs(); attr; 1918 attr = attr->getNext()) 1919 if (attr->getKind() == AttributeList::AT_ObjCOwnership) 1920 return; 1921 1922 transferARCOwnershipToDeclaratorChunk(state, Qualifiers::OCL_Autoreleasing, 1923 outermostPointerIndex); 1924 1925 // Any other number of pointers/references does not trigger the rule. 1926 } else return; 1927 1928 // TODO: mark whether we did this inference? 1929} 1930 1931static void diagnoseIgnoredQualifiers( 1932 Sema &S, unsigned Quals, 1933 SourceLocation FallbackLoc, 1934 SourceLocation ConstQualLoc = SourceLocation(), 1935 SourceLocation VolatileQualLoc = SourceLocation(), 1936 SourceLocation RestrictQualLoc = SourceLocation(), 1937 SourceLocation AtomicQualLoc = SourceLocation()) { 1938 if (!Quals) 1939 return; 1940 1941 const SourceManager &SM = S.getSourceManager(); 1942 1943 struct Qual { 1944 unsigned Mask; 1945 const char *Name; 1946 SourceLocation Loc; 1947 } const QualKinds[4] = { 1948 { DeclSpec::TQ_const, "const", ConstQualLoc }, 1949 { DeclSpec::TQ_volatile, "volatile", VolatileQualLoc }, 1950 { DeclSpec::TQ_restrict, "restrict", RestrictQualLoc }, 1951 { DeclSpec::TQ_atomic, "_Atomic", AtomicQualLoc } 1952 }; 1953 1954 llvm::SmallString<32> QualStr; 1955 unsigned NumQuals = 0; 1956 SourceLocation Loc; 1957 FixItHint FixIts[4]; 1958 1959 // Build a string naming the redundant qualifiers. 1960 for (unsigned I = 0; I != 4; ++I) { 1961 if (Quals & QualKinds[I].Mask) { 1962 if (!QualStr.empty()) QualStr += ' '; 1963 QualStr += QualKinds[I].Name; 1964 1965 // If we have a location for the qualifier, offer a fixit. 1966 SourceLocation QualLoc = QualKinds[I].Loc; 1967 if (!QualLoc.isInvalid()) { 1968 FixIts[NumQuals] = FixItHint::CreateRemoval(QualLoc); 1969 if (Loc.isInvalid() || SM.isBeforeInTranslationUnit(QualLoc, Loc)) 1970 Loc = QualLoc; 1971 } 1972 1973 ++NumQuals; 1974 } 1975 } 1976 1977 S.Diag(Loc.isInvalid() ? FallbackLoc : Loc, diag::warn_qual_return_type) 1978 << QualStr << NumQuals << FixIts[0] << FixIts[1] << FixIts[2] << FixIts[3]; 1979} 1980 1981// Diagnose pointless type qualifiers on the return type of a function. 1982static void diagnoseIgnoredFunctionQualifiers(Sema &S, QualType RetTy, 1983 Declarator &D, 1984 unsigned FunctionChunkIndex) { 1985 if (D.getTypeObject(FunctionChunkIndex).Fun.hasTrailingReturnType()) { 1986 // FIXME: TypeSourceInfo doesn't preserve location information for 1987 // qualifiers. 1988 diagnoseIgnoredQualifiers(S, RetTy.getLocalCVRQualifiers(), 1989 D.getIdentifierLoc()); 1990 return; 1991 } 1992 1993 for (unsigned OuterChunkIndex = FunctionChunkIndex + 1, 1994 End = D.getNumTypeObjects(); 1995 OuterChunkIndex != End; ++OuterChunkIndex) { 1996 DeclaratorChunk &OuterChunk = D.getTypeObject(OuterChunkIndex); 1997 switch (OuterChunk.Kind) { 1998 case DeclaratorChunk::Paren: 1999 continue; 2000 2001 case DeclaratorChunk::Pointer: { 2002 DeclaratorChunk::PointerTypeInfo &PTI = OuterChunk.Ptr; 2003 diagnoseIgnoredQualifiers( 2004 S, PTI.TypeQuals, 2005 SourceLocation(), 2006 SourceLocation::getFromRawEncoding(PTI.ConstQualLoc), 2007 SourceLocation::getFromRawEncoding(PTI.VolatileQualLoc), 2008 SourceLocation::getFromRawEncoding(PTI.RestrictQualLoc), 2009 SourceLocation::getFromRawEncoding(PTI.AtomicQualLoc)); 2010 return; 2011 } 2012 2013 case DeclaratorChunk::Function: 2014 case DeclaratorChunk::BlockPointer: 2015 case DeclaratorChunk::Reference: 2016 case DeclaratorChunk::Array: 2017 case DeclaratorChunk::MemberPointer: 2018 // FIXME: We can't currently provide an accurate source location and a 2019 // fix-it hint for these. 2020 unsigned AtomicQual = RetTy->isAtomicType() ? DeclSpec::TQ_atomic : 0; 2021 diagnoseIgnoredQualifiers(S, RetTy.getCVRQualifiers() | AtomicQual, 2022 D.getIdentifierLoc()); 2023 return; 2024 } 2025 2026 llvm_unreachable("unknown declarator chunk kind"); 2027 } 2028 2029 // If the qualifiers come from a conversion function type, don't diagnose 2030 // them -- they're not necessarily redundant, since such a conversion 2031 // operator can be explicitly called as "x.operator const int()". 2032 if (D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) 2033 return; 2034 2035 // Just parens all the way out to the decl specifiers. Diagnose any qualifiers 2036 // which are present there. 2037 diagnoseIgnoredQualifiers(S, D.getDeclSpec().getTypeQualifiers(), 2038 D.getIdentifierLoc(), 2039 D.getDeclSpec().getConstSpecLoc(), 2040 D.getDeclSpec().getVolatileSpecLoc(), 2041 D.getDeclSpec().getRestrictSpecLoc(), 2042 D.getDeclSpec().getAtomicSpecLoc()); 2043} 2044 2045static QualType GetDeclSpecTypeForDeclarator(TypeProcessingState &state, 2046 TypeSourceInfo *&ReturnTypeInfo) { 2047 Sema &SemaRef = state.getSema(); 2048 Declarator &D = state.getDeclarator(); 2049 QualType T; 2050 ReturnTypeInfo = 0; 2051 2052 // The TagDecl owned by the DeclSpec. 2053 TagDecl *OwnedTagDecl = 0; 2054 2055 bool ContainsPlaceholderType = false; 2056 2057 switch (D.getName().getKind()) { 2058 case UnqualifiedId::IK_ImplicitSelfParam: 2059 case UnqualifiedId::IK_OperatorFunctionId: 2060 case UnqualifiedId::IK_Identifier: 2061 case UnqualifiedId::IK_LiteralOperatorId: 2062 case UnqualifiedId::IK_TemplateId: 2063 T = ConvertDeclSpecToType(state); 2064 ContainsPlaceholderType = D.getDeclSpec().containsPlaceholderType(); 2065 2066 if (!D.isInvalidType() && D.getDeclSpec().isTypeSpecOwned()) { 2067 OwnedTagDecl = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 2068 // Owned declaration is embedded in declarator. 2069 OwnedTagDecl->setEmbeddedInDeclarator(true); 2070 } 2071 break; 2072 2073 case UnqualifiedId::IK_ConstructorName: 2074 case UnqualifiedId::IK_ConstructorTemplateId: 2075 case UnqualifiedId::IK_DestructorName: 2076 // Constructors and destructors don't have return types. Use 2077 // "void" instead. 2078 T = SemaRef.Context.VoidTy; 2079 if (AttributeList *attrs = D.getDeclSpec().getAttributes().getList()) 2080 processTypeAttrs(state, T, TAL_DeclSpec, attrs); 2081 break; 2082 2083 case UnqualifiedId::IK_ConversionFunctionId: 2084 // The result type of a conversion function is the type that it 2085 // converts to. 2086 T = SemaRef.GetTypeFromParser(D.getName().ConversionFunctionId, 2087 &ReturnTypeInfo); 2088 ContainsPlaceholderType = T->getContainedAutoType(); 2089 break; 2090 } 2091 2092 if (D.getAttributes()) 2093 distributeTypeAttrsFromDeclarator(state, T); 2094 2095 // C++11 [dcl.spec.auto]p5: reject 'auto' if it is not in an allowed context. 2096 // In C++11, a function declarator using 'auto' must have a trailing return 2097 // type (this is checked later) and we can skip this. In other languages 2098 // using auto, we need to check regardless. 2099 if (ContainsPlaceholderType && 2100 (!SemaRef.getLangOpts().CPlusPlus11 || !D.isFunctionDeclarator())) { 2101 int Error = -1; 2102 2103 switch (D.getContext()) { 2104 case Declarator::KNRTypeListContext: 2105 llvm_unreachable("K&R type lists aren't allowed in C++"); 2106 case Declarator::LambdaExprContext: 2107 llvm_unreachable("Can't specify a type specifier in lambda grammar"); 2108 case Declarator::ObjCParameterContext: 2109 case Declarator::ObjCResultContext: 2110 case Declarator::PrototypeContext: 2111 Error = 0; // Function prototype 2112 break; 2113 case Declarator::MemberContext: 2114 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_static) 2115 break; 2116 switch (cast<TagDecl>(SemaRef.CurContext)->getTagKind()) { 2117 case TTK_Enum: llvm_unreachable("unhandled tag kind"); 2118 case TTK_Struct: Error = 1; /* Struct member */ break; 2119 case TTK_Union: Error = 2; /* Union member */ break; 2120 case TTK_Class: Error = 3; /* Class member */ break; 2121 case TTK_Interface: Error = 4; /* Interface member */ break; 2122 } 2123 break; 2124 case Declarator::CXXCatchContext: 2125 case Declarator::ObjCCatchContext: 2126 Error = 5; // Exception declaration 2127 break; 2128 case Declarator::TemplateParamContext: 2129 Error = 6; // Template parameter 2130 break; 2131 case Declarator::BlockLiteralContext: 2132 Error = 7; // Block literal 2133 break; 2134 case Declarator::TemplateTypeArgContext: 2135 Error = 8; // Template type argument 2136 break; 2137 case Declarator::AliasDeclContext: 2138 case Declarator::AliasTemplateContext: 2139 Error = 10; // Type alias 2140 break; 2141 case Declarator::TrailingReturnContext: 2142 if (!SemaRef.getLangOpts().CPlusPlus1y) 2143 Error = 11; // Function return type 2144 break; 2145 case Declarator::ConversionIdContext: 2146 if (!SemaRef.getLangOpts().CPlusPlus1y) 2147 Error = 12; // conversion-type-id 2148 break; 2149 case Declarator::TypeNameContext: 2150 Error = 13; // Generic 2151 break; 2152 case Declarator::FileContext: 2153 case Declarator::BlockContext: 2154 case Declarator::ForContext: 2155 case Declarator::ConditionContext: 2156 case Declarator::CXXNewContext: 2157 break; 2158 } 2159 2160 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 2161 Error = 9; 2162 2163 // In Objective-C it is an error to use 'auto' on a function declarator. 2164 if (D.isFunctionDeclarator()) 2165 Error = 11; 2166 2167 // C++11 [dcl.spec.auto]p2: 'auto' is always fine if the declarator 2168 // contains a trailing return type. That is only legal at the outermost 2169 // level. Check all declarator chunks (outermost first) anyway, to give 2170 // better diagnostics. 2171 if (SemaRef.getLangOpts().CPlusPlus11 && Error != -1) { 2172 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 2173 unsigned chunkIndex = e - i - 1; 2174 state.setCurrentChunkIndex(chunkIndex); 2175 DeclaratorChunk &DeclType = D.getTypeObject(chunkIndex); 2176 if (DeclType.Kind == DeclaratorChunk::Function) { 2177 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun; 2178 if (FTI.hasTrailingReturnType()) { 2179 Error = -1; 2180 break; 2181 } 2182 } 2183 } 2184 } 2185 2186 SourceRange AutoRange = D.getDeclSpec().getTypeSpecTypeLoc(); 2187 if (D.getName().getKind() == UnqualifiedId::IK_ConversionFunctionId) 2188 AutoRange = D.getName().getSourceRange(); 2189 2190 if (Error != -1) { 2191 SemaRef.Diag(AutoRange.getBegin(), diag::err_auto_not_allowed) 2192 << Error << AutoRange; 2193 T = SemaRef.Context.IntTy; 2194 D.setInvalidType(true); 2195 } else 2196 SemaRef.Diag(AutoRange.getBegin(), 2197 diag::warn_cxx98_compat_auto_type_specifier) 2198 << AutoRange; 2199 } 2200 2201 if (SemaRef.getLangOpts().CPlusPlus && 2202 OwnedTagDecl && OwnedTagDecl->isCompleteDefinition()) { 2203 // Check the contexts where C++ forbids the declaration of a new class 2204 // or enumeration in a type-specifier-seq. 2205 switch (D.getContext()) { 2206 case Declarator::TrailingReturnContext: 2207 // Class and enumeration definitions are syntactically not allowed in 2208 // trailing return types. 2209 llvm_unreachable("parser should not have allowed this"); 2210 break; 2211 case Declarator::FileContext: 2212 case Declarator::MemberContext: 2213 case Declarator::BlockContext: 2214 case Declarator::ForContext: 2215 case Declarator::BlockLiteralContext: 2216 case Declarator::LambdaExprContext: 2217 // C++11 [dcl.type]p3: 2218 // A type-specifier-seq shall not define a class or enumeration unless 2219 // it appears in the type-id of an alias-declaration (7.1.3) that is not 2220 // the declaration of a template-declaration. 2221 case Declarator::AliasDeclContext: 2222 break; 2223 case Declarator::AliasTemplateContext: 2224 SemaRef.Diag(OwnedTagDecl->getLocation(), 2225 diag::err_type_defined_in_alias_template) 2226 << SemaRef.Context.getTypeDeclType(OwnedTagDecl); 2227 D.setInvalidType(true); 2228 break; 2229 case Declarator::TypeNameContext: 2230 case Declarator::ConversionIdContext: 2231 case Declarator::TemplateParamContext: 2232 case Declarator::CXXNewContext: 2233 case Declarator::CXXCatchContext: 2234 case Declarator::ObjCCatchContext: 2235 case Declarator::TemplateTypeArgContext: 2236 SemaRef.Diag(OwnedTagDecl->getLocation(), 2237 diag::err_type_defined_in_type_specifier) 2238 << SemaRef.Context.getTypeDeclType(OwnedTagDecl); 2239 D.setInvalidType(true); 2240 break; 2241 case Declarator::PrototypeContext: 2242 case Declarator::ObjCParameterContext: 2243 case Declarator::ObjCResultContext: 2244 case Declarator::KNRTypeListContext: 2245 // C++ [dcl.fct]p6: 2246 // Types shall not be defined in return or parameter types. 2247 SemaRef.Diag(OwnedTagDecl->getLocation(), 2248 diag::err_type_defined_in_param_type) 2249 << SemaRef.Context.getTypeDeclType(OwnedTagDecl); 2250 D.setInvalidType(true); 2251 break; 2252 case Declarator::ConditionContext: 2253 // C++ 6.4p2: 2254 // The type-specifier-seq shall not contain typedef and shall not declare 2255 // a new class or enumeration. 2256 SemaRef.Diag(OwnedTagDecl->getLocation(), 2257 diag::err_type_defined_in_condition); 2258 D.setInvalidType(true); 2259 break; 2260 } 2261 } 2262 2263 return T; 2264} 2265 2266static std::string getFunctionQualifiersAsString(const FunctionProtoType *FnTy){ 2267 std::string Quals = 2268 Qualifiers::fromCVRMask(FnTy->getTypeQuals()).getAsString(); 2269 2270 switch (FnTy->getRefQualifier()) { 2271 case RQ_None: 2272 break; 2273 2274 case RQ_LValue: 2275 if (!Quals.empty()) 2276 Quals += ' '; 2277 Quals += '&'; 2278 break; 2279 2280 case RQ_RValue: 2281 if (!Quals.empty()) 2282 Quals += ' '; 2283 Quals += "&&"; 2284 break; 2285 } 2286 2287 return Quals; 2288} 2289 2290/// Check that the function type T, which has a cv-qualifier or a ref-qualifier, 2291/// can be contained within the declarator chunk DeclType, and produce an 2292/// appropriate diagnostic if not. 2293static void checkQualifiedFunction(Sema &S, QualType T, 2294 DeclaratorChunk &DeclType) { 2295 // C++98 [dcl.fct]p4 / C++11 [dcl.fct]p6: a function type with a 2296 // cv-qualifier or a ref-qualifier can only appear at the topmost level 2297 // of a type. 2298 int DiagKind = -1; 2299 switch (DeclType.Kind) { 2300 case DeclaratorChunk::Paren: 2301 case DeclaratorChunk::MemberPointer: 2302 // These cases are permitted. 2303 return; 2304 case DeclaratorChunk::Array: 2305 case DeclaratorChunk::Function: 2306 // These cases don't allow function types at all; no need to diagnose the 2307 // qualifiers separately. 2308 return; 2309 case DeclaratorChunk::BlockPointer: 2310 DiagKind = 0; 2311 break; 2312 case DeclaratorChunk::Pointer: 2313 DiagKind = 1; 2314 break; 2315 case DeclaratorChunk::Reference: 2316 DiagKind = 2; 2317 break; 2318 } 2319 2320 assert(DiagKind != -1); 2321 S.Diag(DeclType.Loc, diag::err_compound_qualified_function_type) 2322 << DiagKind << isa<FunctionType>(T.IgnoreParens()) << T 2323 << getFunctionQualifiersAsString(T->castAs<FunctionProtoType>()); 2324} 2325 2326/// Produce an approprioate diagnostic for an ambiguity between a function 2327/// declarator and a C++ direct-initializer. 2328static void warnAboutAmbiguousFunction(Sema &S, Declarator &D, 2329 DeclaratorChunk &DeclType, QualType RT) { 2330 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun; 2331 assert(FTI.isAmbiguous && "no direct-initializer / function ambiguity"); 2332 2333 // If the return type is void there is no ambiguity. 2334 if (RT->isVoidType()) 2335 return; 2336 2337 // An initializer for a non-class type can have at most one argument. 2338 if (!RT->isRecordType() && FTI.NumArgs > 1) 2339 return; 2340 2341 // An initializer for a reference must have exactly one argument. 2342 if (RT->isReferenceType() && FTI.NumArgs != 1) 2343 return; 2344 2345 // Only warn if this declarator is declaring a function at block scope, and 2346 // doesn't have a storage class (such as 'extern') specified. 2347 if (!D.isFunctionDeclarator() || 2348 D.getFunctionDefinitionKind() != FDK_Declaration || 2349 !S.CurContext->isFunctionOrMethod() || 2350 D.getDeclSpec().getStorageClassSpec() 2351 != DeclSpec::SCS_unspecified) 2352 return; 2353 2354 // Inside a condition, a direct initializer is not permitted. We allow one to 2355 // be parsed in order to give better diagnostics in condition parsing. 2356 if (D.getContext() == Declarator::ConditionContext) 2357 return; 2358 2359 SourceRange ParenRange(DeclType.Loc, DeclType.EndLoc); 2360 2361 S.Diag(DeclType.Loc, 2362 FTI.NumArgs ? diag::warn_parens_disambiguated_as_function_declaration 2363 : diag::warn_empty_parens_are_function_decl) 2364 << ParenRange; 2365 2366 // If the declaration looks like: 2367 // T var1, 2368 // f(); 2369 // and name lookup finds a function named 'f', then the ',' was 2370 // probably intended to be a ';'. 2371 if (!D.isFirstDeclarator() && D.getIdentifier()) { 2372 FullSourceLoc Comma(D.getCommaLoc(), S.SourceMgr); 2373 FullSourceLoc Name(D.getIdentifierLoc(), S.SourceMgr); 2374 if (Comma.getFileID() != Name.getFileID() || 2375 Comma.getSpellingLineNumber() != Name.getSpellingLineNumber()) { 2376 LookupResult Result(S, D.getIdentifier(), SourceLocation(), 2377 Sema::LookupOrdinaryName); 2378 if (S.LookupName(Result, S.getCurScope())) 2379 S.Diag(D.getCommaLoc(), diag::note_empty_parens_function_call) 2380 << FixItHint::CreateReplacement(D.getCommaLoc(), ";") 2381 << D.getIdentifier(); 2382 } 2383 } 2384 2385 if (FTI.NumArgs > 0) { 2386 // For a declaration with parameters, eg. "T var(T());", suggest adding parens 2387 // around the first parameter to turn the declaration into a variable 2388 // declaration. 2389 SourceRange Range = FTI.ArgInfo[0].Param->getSourceRange(); 2390 SourceLocation B = Range.getBegin(); 2391 SourceLocation E = S.PP.getLocForEndOfToken(Range.getEnd()); 2392 // FIXME: Maybe we should suggest adding braces instead of parens 2393 // in C++11 for classes that don't have an initializer_list constructor. 2394 S.Diag(B, diag::note_additional_parens_for_variable_declaration) 2395 << FixItHint::CreateInsertion(B, "(") 2396 << FixItHint::CreateInsertion(E, ")"); 2397 } else { 2398 // For a declaration without parameters, eg. "T var();", suggest replacing the 2399 // parens with an initializer to turn the declaration into a variable 2400 // declaration. 2401 const CXXRecordDecl *RD = RT->getAsCXXRecordDecl(); 2402 2403 // Empty parens mean value-initialization, and no parens mean 2404 // default initialization. These are equivalent if the default 2405 // constructor is user-provided or if zero-initialization is a 2406 // no-op. 2407 if (RD && RD->hasDefinition() && 2408 (RD->isEmpty() || RD->hasUserProvidedDefaultConstructor())) 2409 S.Diag(DeclType.Loc, diag::note_empty_parens_default_ctor) 2410 << FixItHint::CreateRemoval(ParenRange); 2411 else { 2412 std::string Init = S.getFixItZeroInitializerForType(RT); 2413 if (Init.empty() && S.LangOpts.CPlusPlus11) 2414 Init = "{}"; 2415 if (!Init.empty()) 2416 S.Diag(DeclType.Loc, diag::note_empty_parens_zero_initialize) 2417 << FixItHint::CreateReplacement(ParenRange, Init); 2418 } 2419 } 2420} 2421 2422static TypeSourceInfo *GetFullTypeForDeclarator(TypeProcessingState &state, 2423 QualType declSpecType, 2424 TypeSourceInfo *TInfo) { 2425 2426 QualType T = declSpecType; 2427 Declarator &D = state.getDeclarator(); 2428 Sema &S = state.getSema(); 2429 ASTContext &Context = S.Context; 2430 const LangOptions &LangOpts = S.getLangOpts(); 2431 2432 // The name we're declaring, if any. 2433 DeclarationName Name; 2434 if (D.getIdentifier()) 2435 Name = D.getIdentifier(); 2436 2437 // Does this declaration declare a typedef-name? 2438 bool IsTypedefName = 2439 D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef || 2440 D.getContext() == Declarator::AliasDeclContext || 2441 D.getContext() == Declarator::AliasTemplateContext; 2442 2443 // Does T refer to a function type with a cv-qualifier or a ref-qualifier? 2444 bool IsQualifiedFunction = T->isFunctionProtoType() && 2445 (T->castAs<FunctionProtoType>()->getTypeQuals() != 0 || 2446 T->castAs<FunctionProtoType>()->getRefQualifier() != RQ_None); 2447 2448 // If T is 'decltype(auto)', the only declarators we can have are parens 2449 // and at most one function declarator if this is a function declaration. 2450 if (const AutoType *AT = T->getAs<AutoType>()) { 2451 if (AT->isDecltypeAuto()) { 2452 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) { 2453 unsigned Index = E - I - 1; 2454 DeclaratorChunk &DeclChunk = D.getTypeObject(Index); 2455 unsigned DiagId = diag::err_decltype_auto_compound_type; 2456 unsigned DiagKind = 0; 2457 switch (DeclChunk.Kind) { 2458 case DeclaratorChunk::Paren: 2459 continue; 2460 case DeclaratorChunk::Function: { 2461 unsigned FnIndex; 2462 if (D.isFunctionDeclarationContext() && 2463 D.isFunctionDeclarator(FnIndex) && FnIndex == Index) 2464 continue; 2465 DiagId = diag::err_decltype_auto_function_declarator_not_declaration; 2466 break; 2467 } 2468 case DeclaratorChunk::Pointer: 2469 case DeclaratorChunk::BlockPointer: 2470 case DeclaratorChunk::MemberPointer: 2471 DiagKind = 0; 2472 break; 2473 case DeclaratorChunk::Reference: 2474 DiagKind = 1; 2475 break; 2476 case DeclaratorChunk::Array: 2477 DiagKind = 2; 2478 break; 2479 } 2480 2481 S.Diag(DeclChunk.Loc, DiagId) << DiagKind; 2482 D.setInvalidType(true); 2483 break; 2484 } 2485 } 2486 } 2487 2488 // Walk the DeclTypeInfo, building the recursive type as we go. 2489 // DeclTypeInfos are ordered from the identifier out, which is 2490 // opposite of what we want :). 2491 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 2492 unsigned chunkIndex = e - i - 1; 2493 state.setCurrentChunkIndex(chunkIndex); 2494 DeclaratorChunk &DeclType = D.getTypeObject(chunkIndex); 2495 if (IsQualifiedFunction) { 2496 checkQualifiedFunction(S, T, DeclType); 2497 IsQualifiedFunction = DeclType.Kind == DeclaratorChunk::Paren; 2498 } 2499 switch (DeclType.Kind) { 2500 case DeclaratorChunk::Paren: 2501 T = S.BuildParenType(T); 2502 break; 2503 case DeclaratorChunk::BlockPointer: 2504 // If blocks are disabled, emit an error. 2505 if (!LangOpts.Blocks) 2506 S.Diag(DeclType.Loc, diag::err_blocks_disable); 2507 2508 T = S.BuildBlockPointerType(T, D.getIdentifierLoc(), Name); 2509 if (DeclType.Cls.TypeQuals) 2510 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Cls.TypeQuals); 2511 break; 2512 case DeclaratorChunk::Pointer: 2513 // Verify that we're not building a pointer to pointer to function with 2514 // exception specification. 2515 if (LangOpts.CPlusPlus && S.CheckDistantExceptionSpec(T)) { 2516 S.Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 2517 D.setInvalidType(true); 2518 // Build the type anyway. 2519 } 2520 if (LangOpts.ObjC1 && T->getAs<ObjCObjectType>()) { 2521 T = Context.getObjCObjectPointerType(T); 2522 if (DeclType.Ptr.TypeQuals) 2523 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Ptr.TypeQuals); 2524 break; 2525 } 2526 T = S.BuildPointerType(T, DeclType.Loc, Name); 2527 if (DeclType.Ptr.TypeQuals) 2528 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Ptr.TypeQuals); 2529 2530 break; 2531 case DeclaratorChunk::Reference: { 2532 // Verify that we're not building a reference to pointer to function with 2533 // exception specification. 2534 if (LangOpts.CPlusPlus && S.CheckDistantExceptionSpec(T)) { 2535 S.Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 2536 D.setInvalidType(true); 2537 // Build the type anyway. 2538 } 2539 T = S.BuildReferenceType(T, DeclType.Ref.LValueRef, DeclType.Loc, Name); 2540 2541 Qualifiers Quals; 2542 if (DeclType.Ref.HasRestrict) 2543 T = S.BuildQualifiedType(T, DeclType.Loc, Qualifiers::Restrict); 2544 break; 2545 } 2546 case DeclaratorChunk::Array: { 2547 // Verify that we're not building an array of pointers to function with 2548 // exception specification. 2549 if (LangOpts.CPlusPlus && S.CheckDistantExceptionSpec(T)) { 2550 S.Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 2551 D.setInvalidType(true); 2552 // Build the type anyway. 2553 } 2554 DeclaratorChunk::ArrayTypeInfo &ATI = DeclType.Arr; 2555 Expr *ArraySize = static_cast<Expr*>(ATI.NumElts); 2556 ArrayType::ArraySizeModifier ASM; 2557 if (ATI.isStar) 2558 ASM = ArrayType::Star; 2559 else if (ATI.hasStatic) 2560 ASM = ArrayType::Static; 2561 else 2562 ASM = ArrayType::Normal; 2563 if (ASM == ArrayType::Star && !D.isPrototypeContext()) { 2564 // FIXME: This check isn't quite right: it allows star in prototypes 2565 // for function definitions, and disallows some edge cases detailed 2566 // in http://gcc.gnu.org/ml/gcc-patches/2009-02/msg00133.html 2567 S.Diag(DeclType.Loc, diag::err_array_star_outside_prototype); 2568 ASM = ArrayType::Normal; 2569 D.setInvalidType(true); 2570 } 2571 2572 // C99 6.7.5.2p1: The optional type qualifiers and the keyword static 2573 // shall appear only in a declaration of a function parameter with an 2574 // array type, ... 2575 if (ASM == ArrayType::Static || ATI.TypeQuals) { 2576 if (!(D.isPrototypeContext() || 2577 D.getContext() == Declarator::KNRTypeListContext)) { 2578 S.Diag(DeclType.Loc, diag::err_array_static_outside_prototype) << 2579 (ASM == ArrayType::Static ? "'static'" : "type qualifier"); 2580 // Remove the 'static' and the type qualifiers. 2581 if (ASM == ArrayType::Static) 2582 ASM = ArrayType::Normal; 2583 ATI.TypeQuals = 0; 2584 D.setInvalidType(true); 2585 } 2586 2587 // C99 6.7.5.2p1: ... and then only in the outermost array type 2588 // derivation. 2589 unsigned x = chunkIndex; 2590 while (x != 0) { 2591 // Walk outwards along the declarator chunks. 2592 x--; 2593 const DeclaratorChunk &DC = D.getTypeObject(x); 2594 switch (DC.Kind) { 2595 case DeclaratorChunk::Paren: 2596 continue; 2597 case DeclaratorChunk::Array: 2598 case DeclaratorChunk::Pointer: 2599 case DeclaratorChunk::Reference: 2600 case DeclaratorChunk::MemberPointer: 2601 S.Diag(DeclType.Loc, diag::err_array_static_not_outermost) << 2602 (ASM == ArrayType::Static ? "'static'" : "type qualifier"); 2603 if (ASM == ArrayType::Static) 2604 ASM = ArrayType::Normal; 2605 ATI.TypeQuals = 0; 2606 D.setInvalidType(true); 2607 break; 2608 case DeclaratorChunk::Function: 2609 case DeclaratorChunk::BlockPointer: 2610 // These are invalid anyway, so just ignore. 2611 break; 2612 } 2613 } 2614 } 2615 2616 if (const AutoType *AT = T->getContainedAutoType()) { 2617 // We've already diagnosed this for decltype(auto). 2618 if (!AT->isDecltypeAuto()) 2619 S.Diag(DeclType.Loc, diag::err_illegal_decl_array_of_auto) 2620 << getPrintableNameForEntity(Name) << T; 2621 T = QualType(); 2622 break; 2623 } 2624 2625 T = S.BuildArrayType(T, ASM, ArraySize, ATI.TypeQuals, 2626 SourceRange(DeclType.Loc, DeclType.EndLoc), Name); 2627 break; 2628 } 2629 case DeclaratorChunk::Function: { 2630 // If the function declarator has a prototype (i.e. it is not () and 2631 // does not have a K&R-style identifier list), then the arguments are part 2632 // of the type, otherwise the argument list is (). 2633 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun; 2634 IsQualifiedFunction = FTI.TypeQuals || FTI.hasRefQualifier(); 2635 2636 // Check for auto functions and trailing return type and adjust the 2637 // return type accordingly. 2638 if (!D.isInvalidType()) { 2639 // trailing-return-type is only required if we're declaring a function, 2640 // and not, for instance, a pointer to a function. 2641 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto && 2642 !FTI.hasTrailingReturnType() && chunkIndex == 0 && 2643 !S.getLangOpts().CPlusPlus1y) { 2644 S.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 2645 diag::err_auto_missing_trailing_return); 2646 T = Context.IntTy; 2647 D.setInvalidType(true); 2648 } else if (FTI.hasTrailingReturnType()) { 2649 // T must be exactly 'auto' at this point. See CWG issue 681. 2650 if (isa<ParenType>(T)) { 2651 S.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 2652 diag::err_trailing_return_in_parens) 2653 << T << D.getDeclSpec().getSourceRange(); 2654 D.setInvalidType(true); 2655 } else if (D.getContext() != Declarator::LambdaExprContext && 2656 (T.hasQualifiers() || !isa<AutoType>(T) || 2657 cast<AutoType>(T)->isDecltypeAuto())) { 2658 S.Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 2659 diag::err_trailing_return_without_auto) 2660 << T << D.getDeclSpec().getSourceRange(); 2661 D.setInvalidType(true); 2662 } 2663 T = S.GetTypeFromParser(FTI.getTrailingReturnType(), &TInfo); 2664 if (T.isNull()) { 2665 // An error occurred parsing the trailing return type. 2666 T = Context.IntTy; 2667 D.setInvalidType(true); 2668 } 2669 } 2670 } 2671 2672 // C99 6.7.5.3p1: The return type may not be a function or array type. 2673 // For conversion functions, we'll diagnose this particular error later. 2674 if ((T->isArrayType() || T->isFunctionType()) && 2675 (D.getName().getKind() != UnqualifiedId::IK_ConversionFunctionId)) { 2676 unsigned diagID = diag::err_func_returning_array_function; 2677 // Last processing chunk in block context means this function chunk 2678 // represents the block. 2679 if (chunkIndex == 0 && 2680 D.getContext() == Declarator::BlockLiteralContext) 2681 diagID = diag::err_block_returning_array_function; 2682 S.Diag(DeclType.Loc, diagID) << T->isFunctionType() << T; 2683 T = Context.IntTy; 2684 D.setInvalidType(true); 2685 } 2686 2687 // Do not allow returning half FP value. 2688 // FIXME: This really should be in BuildFunctionType. 2689 if (T->isHalfType()) { 2690 if (S.getLangOpts().OpenCL) { 2691 if (!S.getOpenCLOptions().cl_khr_fp16) { 2692 S.Diag(D.getIdentifierLoc(), diag::err_opencl_half_return) << T; 2693 D.setInvalidType(true); 2694 } 2695 } else { 2696 S.Diag(D.getIdentifierLoc(), 2697 diag::err_parameters_retval_cannot_have_fp16_type) << 1; 2698 D.setInvalidType(true); 2699 } 2700 } 2701 2702 // Methods cannot return interface types. All ObjC objects are 2703 // passed by reference. 2704 if (T->isObjCObjectType()) { 2705 SourceLocation DiagLoc, FixitLoc; 2706 if (TInfo) { 2707 DiagLoc = TInfo->getTypeLoc().getLocStart(); 2708 FixitLoc = S.PP.getLocForEndOfToken(TInfo->getTypeLoc().getLocEnd()); 2709 } else { 2710 DiagLoc = D.getDeclSpec().getTypeSpecTypeLoc(); 2711 FixitLoc = S.PP.getLocForEndOfToken(D.getDeclSpec().getLocEnd()); 2712 } 2713 S.Diag(DiagLoc, diag::err_object_cannot_be_passed_returned_by_value) 2714 << 0 << T 2715 << FixItHint::CreateInsertion(FixitLoc, "*"); 2716 2717 T = Context.getObjCObjectPointerType(T); 2718 if (TInfo) { 2719 TypeLocBuilder TLB; 2720 TLB.pushFullCopy(TInfo->getTypeLoc()); 2721 ObjCObjectPointerTypeLoc TLoc = TLB.push<ObjCObjectPointerTypeLoc>(T); 2722 TLoc.setStarLoc(FixitLoc); 2723 TInfo = TLB.getTypeSourceInfo(Context, T); 2724 } 2725 2726 D.setInvalidType(true); 2727 } 2728 2729 // cv-qualifiers on return types are pointless except when the type is a 2730 // class type in C++. 2731 if ((T.getCVRQualifiers() || T->isAtomicType()) && 2732 !(S.getLangOpts().CPlusPlus && 2733 (T->isDependentType() || T->isRecordType()))) 2734 diagnoseIgnoredFunctionQualifiers(S, T, D, chunkIndex); 2735 2736 // Objective-C ARC ownership qualifiers are ignored on the function 2737 // return type (by type canonicalization). Complain if this attribute 2738 // was written here. 2739 if (T.getQualifiers().hasObjCLifetime()) { 2740 SourceLocation AttrLoc; 2741 if (chunkIndex + 1 < D.getNumTypeObjects()) { 2742 DeclaratorChunk ReturnTypeChunk = D.getTypeObject(chunkIndex + 1); 2743 for (const AttributeList *Attr = ReturnTypeChunk.getAttrs(); 2744 Attr; Attr = Attr->getNext()) { 2745 if (Attr->getKind() == AttributeList::AT_ObjCOwnership) { 2746 AttrLoc = Attr->getLoc(); 2747 break; 2748 } 2749 } 2750 } 2751 if (AttrLoc.isInvalid()) { 2752 for (const AttributeList *Attr 2753 = D.getDeclSpec().getAttributes().getList(); 2754 Attr; Attr = Attr->getNext()) { 2755 if (Attr->getKind() == AttributeList::AT_ObjCOwnership) { 2756 AttrLoc = Attr->getLoc(); 2757 break; 2758 } 2759 } 2760 } 2761 2762 if (AttrLoc.isValid()) { 2763 // The ownership attributes are almost always written via 2764 // the predefined 2765 // __strong/__weak/__autoreleasing/__unsafe_unretained. 2766 if (AttrLoc.isMacroID()) 2767 AttrLoc = S.SourceMgr.getImmediateExpansionRange(AttrLoc).first; 2768 2769 S.Diag(AttrLoc, diag::warn_arc_lifetime_result_type) 2770 << T.getQualifiers().getObjCLifetime(); 2771 } 2772 } 2773 2774 if (LangOpts.CPlusPlus && D.getDeclSpec().isTypeSpecOwned()) { 2775 // C++ [dcl.fct]p6: 2776 // Types shall not be defined in return or parameter types. 2777 TagDecl *Tag = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 2778 if (Tag->isCompleteDefinition()) 2779 S.Diag(Tag->getLocation(), diag::err_type_defined_in_result_type) 2780 << Context.getTypeDeclType(Tag); 2781 } 2782 2783 // Exception specs are not allowed in typedefs. Complain, but add it 2784 // anyway. 2785 if (IsTypedefName && FTI.getExceptionSpecType()) 2786 S.Diag(FTI.getExceptionSpecLoc(), diag::err_exception_spec_in_typedef) 2787 << (D.getContext() == Declarator::AliasDeclContext || 2788 D.getContext() == Declarator::AliasTemplateContext); 2789 2790 // If we see "T var();" or "T var(T());" at block scope, it is probably 2791 // an attempt to initialize a variable, not a function declaration. 2792 if (FTI.isAmbiguous) 2793 warnAboutAmbiguousFunction(S, D, DeclType, T); 2794 2795 if (!FTI.NumArgs && !FTI.isVariadic && !LangOpts.CPlusPlus) { 2796 // Simple void foo(), where the incoming T is the result type. 2797 T = Context.getFunctionNoProtoType(T); 2798 } else { 2799 // We allow a zero-parameter variadic function in C if the 2800 // function is marked with the "overloadable" attribute. Scan 2801 // for this attribute now. 2802 if (!FTI.NumArgs && FTI.isVariadic && !LangOpts.CPlusPlus) { 2803 bool Overloadable = false; 2804 for (const AttributeList *Attrs = D.getAttributes(); 2805 Attrs; Attrs = Attrs->getNext()) { 2806 if (Attrs->getKind() == AttributeList::AT_Overloadable) { 2807 Overloadable = true; 2808 break; 2809 } 2810 } 2811 2812 if (!Overloadable) 2813 S.Diag(FTI.getEllipsisLoc(), diag::err_ellipsis_first_arg); 2814 } 2815 2816 if (FTI.NumArgs && FTI.ArgInfo[0].Param == 0) { 2817 // C99 6.7.5.3p3: Reject int(x,y,z) when it's not a function 2818 // definition. 2819 S.Diag(FTI.ArgInfo[0].IdentLoc, diag::err_ident_list_in_fn_declaration); 2820 D.setInvalidType(true); 2821 // Recover by creating a K&R-style function type. 2822 T = Context.getFunctionNoProtoType(T); 2823 break; 2824 } 2825 2826 FunctionProtoType::ExtProtoInfo EPI; 2827 EPI.Variadic = FTI.isVariadic; 2828 EPI.HasTrailingReturn = FTI.hasTrailingReturnType(); 2829 EPI.TypeQuals = FTI.TypeQuals; 2830 EPI.RefQualifier = !FTI.hasRefQualifier()? RQ_None 2831 : FTI.RefQualifierIsLValueRef? RQ_LValue 2832 : RQ_RValue; 2833 2834 // Otherwise, we have a function with an argument list that is 2835 // potentially variadic. 2836 SmallVector<QualType, 16> ArgTys; 2837 ArgTys.reserve(FTI.NumArgs); 2838 2839 SmallVector<bool, 16> ConsumedArguments; 2840 ConsumedArguments.reserve(FTI.NumArgs); 2841 bool HasAnyConsumedArguments = false; 2842 2843 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 2844 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 2845 QualType ArgTy = Param->getType(); 2846 assert(!ArgTy.isNull() && "Couldn't parse type?"); 2847 2848 // Look for 'void'. void is allowed only as a single argument to a 2849 // function with no other parameters (C99 6.7.5.3p10). We record 2850 // int(void) as a FunctionProtoType with an empty argument list. 2851 if (ArgTy->isVoidType()) { 2852 // If this is something like 'float(int, void)', reject it. 'void' 2853 // is an incomplete type (C99 6.2.5p19) and function decls cannot 2854 // have arguments of incomplete type. 2855 if (FTI.NumArgs != 1 || FTI.isVariadic) { 2856 S.Diag(DeclType.Loc, diag::err_void_only_param); 2857 ArgTy = Context.IntTy; 2858 Param->setType(ArgTy); 2859 } else if (FTI.ArgInfo[i].Ident) { 2860 // Reject, but continue to parse 'int(void abc)'. 2861 S.Diag(FTI.ArgInfo[i].IdentLoc, 2862 diag::err_param_with_void_type); 2863 ArgTy = Context.IntTy; 2864 Param->setType(ArgTy); 2865 } else { 2866 // Reject, but continue to parse 'float(const void)'. 2867 if (ArgTy.hasQualifiers()) 2868 S.Diag(DeclType.Loc, diag::err_void_param_qualified); 2869 2870 // Do not add 'void' to the ArgTys list. 2871 break; 2872 } 2873 } else if (ArgTy->isHalfType()) { 2874 // Disallow half FP arguments. 2875 // FIXME: This really should be in BuildFunctionType. 2876 if (S.getLangOpts().OpenCL) { 2877 if (!S.getOpenCLOptions().cl_khr_fp16) { 2878 S.Diag(Param->getLocation(), 2879 diag::err_opencl_half_argument) << ArgTy; 2880 D.setInvalidType(); 2881 Param->setInvalidDecl(); 2882 } 2883 } else { 2884 S.Diag(Param->getLocation(), 2885 diag::err_parameters_retval_cannot_have_fp16_type) << 0; 2886 D.setInvalidType(); 2887 } 2888 } else if (!FTI.hasPrototype) { 2889 if (ArgTy->isPromotableIntegerType()) { 2890 ArgTy = Context.getPromotedIntegerType(ArgTy); 2891 Param->setKNRPromoted(true); 2892 } else if (const BuiltinType* BTy = ArgTy->getAs<BuiltinType>()) { 2893 if (BTy->getKind() == BuiltinType::Float) { 2894 ArgTy = Context.DoubleTy; 2895 Param->setKNRPromoted(true); 2896 } 2897 } 2898 } 2899 2900 if (LangOpts.ObjCAutoRefCount) { 2901 bool Consumed = Param->hasAttr<NSConsumedAttr>(); 2902 ConsumedArguments.push_back(Consumed); 2903 HasAnyConsumedArguments |= Consumed; 2904 } 2905 2906 ArgTys.push_back(ArgTy); 2907 } 2908 2909 if (HasAnyConsumedArguments) 2910 EPI.ConsumedArguments = ConsumedArguments.data(); 2911 2912 SmallVector<QualType, 4> Exceptions; 2913 SmallVector<ParsedType, 2> DynamicExceptions; 2914 SmallVector<SourceRange, 2> DynamicExceptionRanges; 2915 Expr *NoexceptExpr = 0; 2916 2917 if (FTI.getExceptionSpecType() == EST_Dynamic) { 2918 // FIXME: It's rather inefficient to have to split into two vectors 2919 // here. 2920 unsigned N = FTI.NumExceptions; 2921 DynamicExceptions.reserve(N); 2922 DynamicExceptionRanges.reserve(N); 2923 for (unsigned I = 0; I != N; ++I) { 2924 DynamicExceptions.push_back(FTI.Exceptions[I].Ty); 2925 DynamicExceptionRanges.push_back(FTI.Exceptions[I].Range); 2926 } 2927 } else if (FTI.getExceptionSpecType() == EST_ComputedNoexcept) { 2928 NoexceptExpr = FTI.NoexceptExpr; 2929 } 2930 2931 S.checkExceptionSpecification(FTI.getExceptionSpecType(), 2932 DynamicExceptions, 2933 DynamicExceptionRanges, 2934 NoexceptExpr, 2935 Exceptions, 2936 EPI); 2937 2938 T = Context.getFunctionType(T, ArgTys, EPI); 2939 } 2940 2941 break; 2942 } 2943 case DeclaratorChunk::MemberPointer: 2944 // The scope spec must refer to a class, or be dependent. 2945 CXXScopeSpec &SS = DeclType.Mem.Scope(); 2946 QualType ClsType; 2947 if (SS.isInvalid()) { 2948 // Avoid emitting extra errors if we already errored on the scope. 2949 D.setInvalidType(true); 2950 } else if (S.isDependentScopeSpecifier(SS) || 2951 dyn_cast_or_null<CXXRecordDecl>(S.computeDeclContext(SS))) { 2952 NestedNameSpecifier *NNS 2953 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 2954 NestedNameSpecifier *NNSPrefix = NNS->getPrefix(); 2955 switch (NNS->getKind()) { 2956 case NestedNameSpecifier::Identifier: 2957 ClsType = Context.getDependentNameType(ETK_None, NNSPrefix, 2958 NNS->getAsIdentifier()); 2959 break; 2960 2961 case NestedNameSpecifier::Namespace: 2962 case NestedNameSpecifier::NamespaceAlias: 2963 case NestedNameSpecifier::Global: 2964 llvm_unreachable("Nested-name-specifier must name a type"); 2965 2966 case NestedNameSpecifier::TypeSpec: 2967 case NestedNameSpecifier::TypeSpecWithTemplate: 2968 ClsType = QualType(NNS->getAsType(), 0); 2969 // Note: if the NNS has a prefix and ClsType is a nondependent 2970 // TemplateSpecializationType, then the NNS prefix is NOT included 2971 // in ClsType; hence we wrap ClsType into an ElaboratedType. 2972 // NOTE: in particular, no wrap occurs if ClsType already is an 2973 // Elaborated, DependentName, or DependentTemplateSpecialization. 2974 if (NNSPrefix && isa<TemplateSpecializationType>(NNS->getAsType())) 2975 ClsType = Context.getElaboratedType(ETK_None, NNSPrefix, ClsType); 2976 break; 2977 } 2978 } else { 2979 S.Diag(DeclType.Mem.Scope().getBeginLoc(), 2980 diag::err_illegal_decl_mempointer_in_nonclass) 2981 << (D.getIdentifier() ? D.getIdentifier()->getName() : "type name") 2982 << DeclType.Mem.Scope().getRange(); 2983 D.setInvalidType(true); 2984 } 2985 2986 if (!ClsType.isNull()) 2987 T = S.BuildMemberPointerType(T, ClsType, DeclType.Loc, D.getIdentifier()); 2988 if (T.isNull()) { 2989 T = Context.IntTy; 2990 D.setInvalidType(true); 2991 } else if (DeclType.Mem.TypeQuals) { 2992 T = S.BuildQualifiedType(T, DeclType.Loc, DeclType.Mem.TypeQuals); 2993 } 2994 break; 2995 } 2996 2997 if (T.isNull()) { 2998 D.setInvalidType(true); 2999 T = Context.IntTy; 3000 } 3001 3002 // See if there are any attributes on this declarator chunk. 3003 if (AttributeList *attrs = const_cast<AttributeList*>(DeclType.getAttrs())) 3004 processTypeAttrs(state, T, TAL_DeclChunk, attrs); 3005 } 3006 3007 if (LangOpts.CPlusPlus && T->isFunctionType()) { 3008 const FunctionProtoType *FnTy = T->getAs<FunctionProtoType>(); 3009 assert(FnTy && "Why oh why is there not a FunctionProtoType here?"); 3010 3011 // C++ 8.3.5p4: 3012 // A cv-qualifier-seq shall only be part of the function type 3013 // for a nonstatic member function, the function type to which a pointer 3014 // to member refers, or the top-level function type of a function typedef 3015 // declaration. 3016 // 3017 // Core issue 547 also allows cv-qualifiers on function types that are 3018 // top-level template type arguments. 3019 bool FreeFunction; 3020 if (!D.getCXXScopeSpec().isSet()) { 3021 FreeFunction = ((D.getContext() != Declarator::MemberContext && 3022 D.getContext() != Declarator::LambdaExprContext) || 3023 D.getDeclSpec().isFriendSpecified()); 3024 } else { 3025 DeclContext *DC = S.computeDeclContext(D.getCXXScopeSpec()); 3026 FreeFunction = (DC && !DC->isRecord()); 3027 } 3028 3029 // C++11 [dcl.fct]p6 (w/DR1417): 3030 // An attempt to specify a function type with a cv-qualifier-seq or a 3031 // ref-qualifier (including by typedef-name) is ill-formed unless it is: 3032 // - the function type for a non-static member function, 3033 // - the function type to which a pointer to member refers, 3034 // - the top-level function type of a function typedef declaration or 3035 // alias-declaration, 3036 // - the type-id in the default argument of a type-parameter, or 3037 // - the type-id of a template-argument for a type-parameter 3038 if (IsQualifiedFunction && 3039 !(!FreeFunction && 3040 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) && 3041 !IsTypedefName && 3042 D.getContext() != Declarator::TemplateTypeArgContext) { 3043 SourceLocation Loc = D.getLocStart(); 3044 SourceRange RemovalRange; 3045 unsigned I; 3046 if (D.isFunctionDeclarator(I)) { 3047 SmallVector<SourceLocation, 4> RemovalLocs; 3048 const DeclaratorChunk &Chunk = D.getTypeObject(I); 3049 assert(Chunk.Kind == DeclaratorChunk::Function); 3050 if (Chunk.Fun.hasRefQualifier()) 3051 RemovalLocs.push_back(Chunk.Fun.getRefQualifierLoc()); 3052 if (Chunk.Fun.TypeQuals & Qualifiers::Const) 3053 RemovalLocs.push_back(Chunk.Fun.getConstQualifierLoc()); 3054 if (Chunk.Fun.TypeQuals & Qualifiers::Volatile) 3055 RemovalLocs.push_back(Chunk.Fun.getVolatileQualifierLoc()); 3056 // FIXME: We do not track the location of the __restrict qualifier. 3057 //if (Chunk.Fun.TypeQuals & Qualifiers::Restrict) 3058 // RemovalLocs.push_back(Chunk.Fun.getRestrictQualifierLoc()); 3059 if (!RemovalLocs.empty()) { 3060 std::sort(RemovalLocs.begin(), RemovalLocs.end(), 3061 BeforeThanCompare<SourceLocation>(S.getSourceManager())); 3062 RemovalRange = SourceRange(RemovalLocs.front(), RemovalLocs.back()); 3063 Loc = RemovalLocs.front(); 3064 } 3065 } 3066 3067 S.Diag(Loc, diag::err_invalid_qualified_function_type) 3068 << FreeFunction << D.isFunctionDeclarator() << T 3069 << getFunctionQualifiersAsString(FnTy) 3070 << FixItHint::CreateRemoval(RemovalRange); 3071 3072 // Strip the cv-qualifiers and ref-qualifiers from the type. 3073 FunctionProtoType::ExtProtoInfo EPI = FnTy->getExtProtoInfo(); 3074 EPI.TypeQuals = 0; 3075 EPI.RefQualifier = RQ_None; 3076 3077 T = Context.getFunctionType(FnTy->getResultType(), FnTy->getArgTypes(), 3078 EPI); 3079 // Rebuild any parens around the identifier in the function type. 3080 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 3081 if (D.getTypeObject(i).Kind != DeclaratorChunk::Paren) 3082 break; 3083 T = S.BuildParenType(T); 3084 } 3085 } 3086 } 3087 3088 // Apply any undistributed attributes from the declarator. 3089 if (!T.isNull()) 3090 if (AttributeList *attrs = D.getAttributes()) 3091 processTypeAttrs(state, T, TAL_DeclName, attrs); 3092 3093 // Diagnose any ignored type attributes. 3094 if (!T.isNull()) state.diagnoseIgnoredTypeAttrs(T); 3095 3096 // C++0x [dcl.constexpr]p9: 3097 // A constexpr specifier used in an object declaration declares the object 3098 // as const. 3099 if (D.getDeclSpec().isConstexprSpecified() && T->isObjectType()) { 3100 T.addConst(); 3101 } 3102 3103 // If there was an ellipsis in the declarator, the declaration declares a 3104 // parameter pack whose type may be a pack expansion type. 3105 if (D.hasEllipsis() && !T.isNull()) { 3106 // C++0x [dcl.fct]p13: 3107 // A declarator-id or abstract-declarator containing an ellipsis shall 3108 // only be used in a parameter-declaration. Such a parameter-declaration 3109 // is a parameter pack (14.5.3). [...] 3110 switch (D.getContext()) { 3111 case Declarator::PrototypeContext: 3112 // C++0x [dcl.fct]p13: 3113 // [...] When it is part of a parameter-declaration-clause, the 3114 // parameter pack is a function parameter pack (14.5.3). The type T 3115 // of the declarator-id of the function parameter pack shall contain 3116 // a template parameter pack; each template parameter pack in T is 3117 // expanded by the function parameter pack. 3118 // 3119 // We represent function parameter packs as function parameters whose 3120 // type is a pack expansion. 3121 if (!T->containsUnexpandedParameterPack()) { 3122 S.Diag(D.getEllipsisLoc(), 3123 diag::err_function_parameter_pack_without_parameter_packs) 3124 << T << D.getSourceRange(); 3125 D.setEllipsisLoc(SourceLocation()); 3126 } else { 3127 T = Context.getPackExpansionType(T, None); 3128 } 3129 break; 3130 3131 case Declarator::TemplateParamContext: 3132 // C++0x [temp.param]p15: 3133 // If a template-parameter is a [...] is a parameter-declaration that 3134 // declares a parameter pack (8.3.5), then the template-parameter is a 3135 // template parameter pack (14.5.3). 3136 // 3137 // Note: core issue 778 clarifies that, if there are any unexpanded 3138 // parameter packs in the type of the non-type template parameter, then 3139 // it expands those parameter packs. 3140 if (T->containsUnexpandedParameterPack()) 3141 T = Context.getPackExpansionType(T, None); 3142 else 3143 S.Diag(D.getEllipsisLoc(), 3144 LangOpts.CPlusPlus11 3145 ? diag::warn_cxx98_compat_variadic_templates 3146 : diag::ext_variadic_templates); 3147 break; 3148 3149 case Declarator::FileContext: 3150 case Declarator::KNRTypeListContext: 3151 case Declarator::ObjCParameterContext: // FIXME: special diagnostic here? 3152 case Declarator::ObjCResultContext: // FIXME: special diagnostic here? 3153 case Declarator::TypeNameContext: 3154 case Declarator::CXXNewContext: 3155 case Declarator::AliasDeclContext: 3156 case Declarator::AliasTemplateContext: 3157 case Declarator::MemberContext: 3158 case Declarator::BlockContext: 3159 case Declarator::ForContext: 3160 case Declarator::ConditionContext: 3161 case Declarator::CXXCatchContext: 3162 case Declarator::ObjCCatchContext: 3163 case Declarator::BlockLiteralContext: 3164 case Declarator::LambdaExprContext: 3165 case Declarator::ConversionIdContext: 3166 case Declarator::TrailingReturnContext: 3167 case Declarator::TemplateTypeArgContext: 3168 // FIXME: We may want to allow parameter packs in block-literal contexts 3169 // in the future. 3170 S.Diag(D.getEllipsisLoc(), diag::err_ellipsis_in_declarator_not_parameter); 3171 D.setEllipsisLoc(SourceLocation()); 3172 break; 3173 } 3174 } 3175 3176 if (T.isNull()) 3177 return Context.getNullTypeSourceInfo(); 3178 else if (D.isInvalidType()) 3179 return Context.getTrivialTypeSourceInfo(T); 3180 3181 return S.GetTypeSourceInfoForDeclarator(D, T, TInfo); 3182} 3183 3184/// GetTypeForDeclarator - Convert the type for the specified 3185/// declarator to Type instances. 3186/// 3187/// The result of this call will never be null, but the associated 3188/// type may be a null type if there's an unrecoverable error. 3189TypeSourceInfo *Sema::GetTypeForDeclarator(Declarator &D, Scope *S) { 3190 // Determine the type of the declarator. Not all forms of declarator 3191 // have a type. 3192 3193 TypeProcessingState state(*this, D); 3194 3195 TypeSourceInfo *ReturnTypeInfo = 0; 3196 QualType T = GetDeclSpecTypeForDeclarator(state, ReturnTypeInfo); 3197 if (T.isNull()) 3198 return Context.getNullTypeSourceInfo(); 3199 3200 if (D.isPrototypeContext() && getLangOpts().ObjCAutoRefCount) 3201 inferARCWriteback(state, T); 3202 3203 return GetFullTypeForDeclarator(state, T, ReturnTypeInfo); 3204} 3205 3206static void transferARCOwnershipToDeclSpec(Sema &S, 3207 QualType &declSpecTy, 3208 Qualifiers::ObjCLifetime ownership) { 3209 if (declSpecTy->isObjCRetainableType() && 3210 declSpecTy.getObjCLifetime() == Qualifiers::OCL_None) { 3211 Qualifiers qs; 3212 qs.addObjCLifetime(ownership); 3213 declSpecTy = S.Context.getQualifiedType(declSpecTy, qs); 3214 } 3215} 3216 3217static void transferARCOwnershipToDeclaratorChunk(TypeProcessingState &state, 3218 Qualifiers::ObjCLifetime ownership, 3219 unsigned chunkIndex) { 3220 Sema &S = state.getSema(); 3221 Declarator &D = state.getDeclarator(); 3222 3223 // Look for an explicit lifetime attribute. 3224 DeclaratorChunk &chunk = D.getTypeObject(chunkIndex); 3225 for (const AttributeList *attr = chunk.getAttrs(); attr; 3226 attr = attr->getNext()) 3227 if (attr->getKind() == AttributeList::AT_ObjCOwnership) 3228 return; 3229 3230 const char *attrStr = 0; 3231 switch (ownership) { 3232 case Qualifiers::OCL_None: llvm_unreachable("no ownership!"); 3233 case Qualifiers::OCL_ExplicitNone: attrStr = "none"; break; 3234 case Qualifiers::OCL_Strong: attrStr = "strong"; break; 3235 case Qualifiers::OCL_Weak: attrStr = "weak"; break; 3236 case Qualifiers::OCL_Autoreleasing: attrStr = "autoreleasing"; break; 3237 } 3238 3239 // If there wasn't one, add one (with an invalid source location 3240 // so that we don't make an AttributedType for it). 3241 AttributeList *attr = D.getAttributePool() 3242 .create(&S.Context.Idents.get("objc_ownership"), SourceLocation(), 3243 /*scope*/ 0, SourceLocation(), 3244 &S.Context.Idents.get(attrStr), SourceLocation(), 3245 /*args*/ 0, 0, AttributeList::AS_GNU); 3246 spliceAttrIntoList(*attr, chunk.getAttrListRef()); 3247 3248 // TODO: mark whether we did this inference? 3249} 3250 3251/// \brief Used for transferring ownership in casts resulting in l-values. 3252static void transferARCOwnership(TypeProcessingState &state, 3253 QualType &declSpecTy, 3254 Qualifiers::ObjCLifetime ownership) { 3255 Sema &S = state.getSema(); 3256 Declarator &D = state.getDeclarator(); 3257 3258 int inner = -1; 3259 bool hasIndirection = false; 3260 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 3261 DeclaratorChunk &chunk = D.getTypeObject(i); 3262 switch (chunk.Kind) { 3263 case DeclaratorChunk::Paren: 3264 // Ignore parens. 3265 break; 3266 3267 case DeclaratorChunk::Array: 3268 case DeclaratorChunk::Reference: 3269 case DeclaratorChunk::Pointer: 3270 if (inner != -1) 3271 hasIndirection = true; 3272 inner = i; 3273 break; 3274 3275 case DeclaratorChunk::BlockPointer: 3276 if (inner != -1) 3277 transferARCOwnershipToDeclaratorChunk(state, ownership, i); 3278 return; 3279 3280 case DeclaratorChunk::Function: 3281 case DeclaratorChunk::MemberPointer: 3282 return; 3283 } 3284 } 3285 3286 if (inner == -1) 3287 return; 3288 3289 DeclaratorChunk &chunk = D.getTypeObject(inner); 3290 if (chunk.Kind == DeclaratorChunk::Pointer) { 3291 if (declSpecTy->isObjCRetainableType()) 3292 return transferARCOwnershipToDeclSpec(S, declSpecTy, ownership); 3293 if (declSpecTy->isObjCObjectType() && hasIndirection) 3294 return transferARCOwnershipToDeclaratorChunk(state, ownership, inner); 3295 } else { 3296 assert(chunk.Kind == DeclaratorChunk::Array || 3297 chunk.Kind == DeclaratorChunk::Reference); 3298 return transferARCOwnershipToDeclSpec(S, declSpecTy, ownership); 3299 } 3300} 3301 3302TypeSourceInfo *Sema::GetTypeForDeclaratorCast(Declarator &D, QualType FromTy) { 3303 TypeProcessingState state(*this, D); 3304 3305 TypeSourceInfo *ReturnTypeInfo = 0; 3306 QualType declSpecTy = GetDeclSpecTypeForDeclarator(state, ReturnTypeInfo); 3307 if (declSpecTy.isNull()) 3308 return Context.getNullTypeSourceInfo(); 3309 3310 if (getLangOpts().ObjCAutoRefCount) { 3311 Qualifiers::ObjCLifetime ownership = Context.getInnerObjCOwnership(FromTy); 3312 if (ownership != Qualifiers::OCL_None) 3313 transferARCOwnership(state, declSpecTy, ownership); 3314 } 3315 3316 return GetFullTypeForDeclarator(state, declSpecTy, ReturnTypeInfo); 3317} 3318 3319/// Map an AttributedType::Kind to an AttributeList::Kind. 3320static AttributeList::Kind getAttrListKind(AttributedType::Kind kind) { 3321 switch (kind) { 3322 case AttributedType::attr_address_space: 3323 return AttributeList::AT_AddressSpace; 3324 case AttributedType::attr_regparm: 3325 return AttributeList::AT_Regparm; 3326 case AttributedType::attr_vector_size: 3327 return AttributeList::AT_VectorSize; 3328 case AttributedType::attr_neon_vector_type: 3329 return AttributeList::AT_NeonVectorType; 3330 case AttributedType::attr_neon_polyvector_type: 3331 return AttributeList::AT_NeonPolyVectorType; 3332 case AttributedType::attr_objc_gc: 3333 return AttributeList::AT_ObjCGC; 3334 case AttributedType::attr_objc_ownership: 3335 return AttributeList::AT_ObjCOwnership; 3336 case AttributedType::attr_noreturn: 3337 return AttributeList::AT_NoReturn; 3338 case AttributedType::attr_cdecl: 3339 return AttributeList::AT_CDecl; 3340 case AttributedType::attr_fastcall: 3341 return AttributeList::AT_FastCall; 3342 case AttributedType::attr_stdcall: 3343 return AttributeList::AT_StdCall; 3344 case AttributedType::attr_thiscall: 3345 return AttributeList::AT_ThisCall; 3346 case AttributedType::attr_pascal: 3347 return AttributeList::AT_Pascal; 3348 case AttributedType::attr_pcs: 3349 return AttributeList::AT_Pcs; 3350 case AttributedType::attr_pnaclcall: 3351 return AttributeList::AT_PnaclCall; 3352 case AttributedType::attr_inteloclbicc: 3353 return AttributeList::AT_IntelOclBicc; 3354 case AttributedType::attr_ptr32: 3355 return AttributeList::AT_Ptr32; 3356 case AttributedType::attr_ptr64: 3357 return AttributeList::AT_Ptr64; 3358 case AttributedType::attr_sptr: 3359 return AttributeList::AT_SPtr; 3360 case AttributedType::attr_uptr: 3361 return AttributeList::AT_UPtr; 3362 } 3363 llvm_unreachable("unexpected attribute kind!"); 3364} 3365 3366static void fillAttributedTypeLoc(AttributedTypeLoc TL, 3367 const AttributeList *attrs) { 3368 AttributedType::Kind kind = TL.getAttrKind(); 3369 3370 assert(attrs && "no type attributes in the expected location!"); 3371 AttributeList::Kind parsedKind = getAttrListKind(kind); 3372 while (attrs->getKind() != parsedKind) { 3373 attrs = attrs->getNext(); 3374 assert(attrs && "no matching attribute in expected location!"); 3375 } 3376 3377 TL.setAttrNameLoc(attrs->getLoc()); 3378 if (TL.hasAttrExprOperand()) 3379 TL.setAttrExprOperand(attrs->getArg(0)); 3380 else if (TL.hasAttrEnumOperand()) 3381 TL.setAttrEnumOperandLoc(attrs->getParameterLoc()); 3382 3383 // FIXME: preserve this information to here. 3384 if (TL.hasAttrOperand()) 3385 TL.setAttrOperandParensRange(SourceRange()); 3386} 3387 3388namespace { 3389 class TypeSpecLocFiller : public TypeLocVisitor<TypeSpecLocFiller> { 3390 ASTContext &Context; 3391 const DeclSpec &DS; 3392 3393 public: 3394 TypeSpecLocFiller(ASTContext &Context, const DeclSpec &DS) 3395 : Context(Context), DS(DS) {} 3396 3397 void VisitAttributedTypeLoc(AttributedTypeLoc TL) { 3398 fillAttributedTypeLoc(TL, DS.getAttributes().getList()); 3399 Visit(TL.getModifiedLoc()); 3400 } 3401 void VisitQualifiedTypeLoc(QualifiedTypeLoc TL) { 3402 Visit(TL.getUnqualifiedLoc()); 3403 } 3404 void VisitTypedefTypeLoc(TypedefTypeLoc TL) { 3405 TL.setNameLoc(DS.getTypeSpecTypeLoc()); 3406 } 3407 void VisitObjCInterfaceTypeLoc(ObjCInterfaceTypeLoc TL) { 3408 TL.setNameLoc(DS.getTypeSpecTypeLoc()); 3409 // FIXME. We should have DS.getTypeSpecTypeEndLoc(). But, it requires 3410 // addition field. What we have is good enough for dispay of location 3411 // of 'fixit' on interface name. 3412 TL.setNameEndLoc(DS.getLocEnd()); 3413 } 3414 void VisitObjCObjectTypeLoc(ObjCObjectTypeLoc TL) { 3415 // Handle the base type, which might not have been written explicitly. 3416 if (DS.getTypeSpecType() == DeclSpec::TST_unspecified) { 3417 TL.setHasBaseTypeAsWritten(false); 3418 TL.getBaseLoc().initialize(Context, SourceLocation()); 3419 } else { 3420 TL.setHasBaseTypeAsWritten(true); 3421 Visit(TL.getBaseLoc()); 3422 } 3423 3424 // Protocol qualifiers. 3425 if (DS.getProtocolQualifiers()) { 3426 assert(TL.getNumProtocols() > 0); 3427 assert(TL.getNumProtocols() == DS.getNumProtocolQualifiers()); 3428 TL.setLAngleLoc(DS.getProtocolLAngleLoc()); 3429 TL.setRAngleLoc(DS.getSourceRange().getEnd()); 3430 for (unsigned i = 0, e = DS.getNumProtocolQualifiers(); i != e; ++i) 3431 TL.setProtocolLoc(i, DS.getProtocolLocs()[i]); 3432 } else { 3433 assert(TL.getNumProtocols() == 0); 3434 TL.setLAngleLoc(SourceLocation()); 3435 TL.setRAngleLoc(SourceLocation()); 3436 } 3437 } 3438 void VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL) { 3439 TL.setStarLoc(SourceLocation()); 3440 Visit(TL.getPointeeLoc()); 3441 } 3442 void VisitTemplateSpecializationTypeLoc(TemplateSpecializationTypeLoc TL) { 3443 TypeSourceInfo *TInfo = 0; 3444 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 3445 3446 // If we got no declarator info from previous Sema routines, 3447 // just fill with the typespec loc. 3448 if (!TInfo) { 3449 TL.initialize(Context, DS.getTypeSpecTypeNameLoc()); 3450 return; 3451 } 3452 3453 TypeLoc OldTL = TInfo->getTypeLoc(); 3454 if (TInfo->getType()->getAs<ElaboratedType>()) { 3455 ElaboratedTypeLoc ElabTL = OldTL.castAs<ElaboratedTypeLoc>(); 3456 TemplateSpecializationTypeLoc NamedTL = ElabTL.getNamedTypeLoc() 3457 .castAs<TemplateSpecializationTypeLoc>(); 3458 TL.copy(NamedTL); 3459 } else { 3460 TL.copy(OldTL.castAs<TemplateSpecializationTypeLoc>()); 3461 assert(TL.getRAngleLoc() == OldTL.castAs<TemplateSpecializationTypeLoc>().getRAngleLoc()); 3462 } 3463 3464 } 3465 void VisitTypeOfExprTypeLoc(TypeOfExprTypeLoc TL) { 3466 assert(DS.getTypeSpecType() == DeclSpec::TST_typeofExpr); 3467 TL.setTypeofLoc(DS.getTypeSpecTypeLoc()); 3468 TL.setParensRange(DS.getTypeofParensRange()); 3469 } 3470 void VisitTypeOfTypeLoc(TypeOfTypeLoc TL) { 3471 assert(DS.getTypeSpecType() == DeclSpec::TST_typeofType); 3472 TL.setTypeofLoc(DS.getTypeSpecTypeLoc()); 3473 TL.setParensRange(DS.getTypeofParensRange()); 3474 assert(DS.getRepAsType()); 3475 TypeSourceInfo *TInfo = 0; 3476 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 3477 TL.setUnderlyingTInfo(TInfo); 3478 } 3479 void VisitUnaryTransformTypeLoc(UnaryTransformTypeLoc TL) { 3480 // FIXME: This holds only because we only have one unary transform. 3481 assert(DS.getTypeSpecType() == DeclSpec::TST_underlyingType); 3482 TL.setKWLoc(DS.getTypeSpecTypeLoc()); 3483 TL.setParensRange(DS.getTypeofParensRange()); 3484 assert(DS.getRepAsType()); 3485 TypeSourceInfo *TInfo = 0; 3486 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 3487 TL.setUnderlyingTInfo(TInfo); 3488 } 3489 void VisitBuiltinTypeLoc(BuiltinTypeLoc TL) { 3490 // By default, use the source location of the type specifier. 3491 TL.setBuiltinLoc(DS.getTypeSpecTypeLoc()); 3492 if (TL.needsExtraLocalData()) { 3493 // Set info for the written builtin specifiers. 3494 TL.getWrittenBuiltinSpecs() = DS.getWrittenBuiltinSpecs(); 3495 // Try to have a meaningful source location. 3496 if (TL.getWrittenSignSpec() != TSS_unspecified) 3497 // Sign spec loc overrides the others (e.g., 'unsigned long'). 3498 TL.setBuiltinLoc(DS.getTypeSpecSignLoc()); 3499 else if (TL.getWrittenWidthSpec() != TSW_unspecified) 3500 // Width spec loc overrides type spec loc (e.g., 'short int'). 3501 TL.setBuiltinLoc(DS.getTypeSpecWidthLoc()); 3502 } 3503 } 3504 void VisitElaboratedTypeLoc(ElaboratedTypeLoc TL) { 3505 ElaboratedTypeKeyword Keyword 3506 = TypeWithKeyword::getKeywordForTypeSpec(DS.getTypeSpecType()); 3507 if (DS.getTypeSpecType() == TST_typename) { 3508 TypeSourceInfo *TInfo = 0; 3509 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 3510 if (TInfo) { 3511 TL.copy(TInfo->getTypeLoc().castAs<ElaboratedTypeLoc>()); 3512 return; 3513 } 3514 } 3515 TL.setElaboratedKeywordLoc(Keyword != ETK_None 3516 ? DS.getTypeSpecTypeLoc() 3517 : SourceLocation()); 3518 const CXXScopeSpec& SS = DS.getTypeSpecScope(); 3519 TL.setQualifierLoc(SS.getWithLocInContext(Context)); 3520 Visit(TL.getNextTypeLoc().getUnqualifiedLoc()); 3521 } 3522 void VisitDependentNameTypeLoc(DependentNameTypeLoc TL) { 3523 assert(DS.getTypeSpecType() == TST_typename); 3524 TypeSourceInfo *TInfo = 0; 3525 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 3526 assert(TInfo); 3527 TL.copy(TInfo->getTypeLoc().castAs<DependentNameTypeLoc>()); 3528 } 3529 void VisitDependentTemplateSpecializationTypeLoc( 3530 DependentTemplateSpecializationTypeLoc TL) { 3531 assert(DS.getTypeSpecType() == TST_typename); 3532 TypeSourceInfo *TInfo = 0; 3533 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 3534 assert(TInfo); 3535 TL.copy( 3536 TInfo->getTypeLoc().castAs<DependentTemplateSpecializationTypeLoc>()); 3537 } 3538 void VisitTagTypeLoc(TagTypeLoc TL) { 3539 TL.setNameLoc(DS.getTypeSpecTypeNameLoc()); 3540 } 3541 void VisitAtomicTypeLoc(AtomicTypeLoc TL) { 3542 // An AtomicTypeLoc can come from either an _Atomic(...) type specifier 3543 // or an _Atomic qualifier. 3544 if (DS.getTypeSpecType() == DeclSpec::TST_atomic) { 3545 TL.setKWLoc(DS.getTypeSpecTypeLoc()); 3546 TL.setParensRange(DS.getTypeofParensRange()); 3547 3548 TypeSourceInfo *TInfo = 0; 3549 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 3550 assert(TInfo); 3551 TL.getValueLoc().initializeFullCopy(TInfo->getTypeLoc()); 3552 } else { 3553 TL.setKWLoc(DS.getAtomicSpecLoc()); 3554 // No parens, to indicate this was spelled as an _Atomic qualifier. 3555 TL.setParensRange(SourceRange()); 3556 Visit(TL.getValueLoc()); 3557 } 3558 } 3559 3560 void VisitTypeLoc(TypeLoc TL) { 3561 // FIXME: add other typespec types and change this to an assert. 3562 TL.initialize(Context, DS.getTypeSpecTypeLoc()); 3563 } 3564 }; 3565 3566 class DeclaratorLocFiller : public TypeLocVisitor<DeclaratorLocFiller> { 3567 ASTContext &Context; 3568 const DeclaratorChunk &Chunk; 3569 3570 public: 3571 DeclaratorLocFiller(ASTContext &Context, const DeclaratorChunk &Chunk) 3572 : Context(Context), Chunk(Chunk) {} 3573 3574 void VisitQualifiedTypeLoc(QualifiedTypeLoc TL) { 3575 llvm_unreachable("qualified type locs not expected here!"); 3576 } 3577 void VisitDecayedTypeLoc(DecayedTypeLoc TL) { 3578 llvm_unreachable("decayed type locs not expected here!"); 3579 } 3580 3581 void VisitAttributedTypeLoc(AttributedTypeLoc TL) { 3582 fillAttributedTypeLoc(TL, Chunk.getAttrs()); 3583 } 3584 void VisitBlockPointerTypeLoc(BlockPointerTypeLoc TL) { 3585 assert(Chunk.Kind == DeclaratorChunk::BlockPointer); 3586 TL.setCaretLoc(Chunk.Loc); 3587 } 3588 void VisitPointerTypeLoc(PointerTypeLoc TL) { 3589 assert(Chunk.Kind == DeclaratorChunk::Pointer); 3590 TL.setStarLoc(Chunk.Loc); 3591 } 3592 void VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL) { 3593 assert(Chunk.Kind == DeclaratorChunk::Pointer); 3594 TL.setStarLoc(Chunk.Loc); 3595 } 3596 void VisitMemberPointerTypeLoc(MemberPointerTypeLoc TL) { 3597 assert(Chunk.Kind == DeclaratorChunk::MemberPointer); 3598 const CXXScopeSpec& SS = Chunk.Mem.Scope(); 3599 NestedNameSpecifierLoc NNSLoc = SS.getWithLocInContext(Context); 3600 3601 const Type* ClsTy = TL.getClass(); 3602 QualType ClsQT = QualType(ClsTy, 0); 3603 TypeSourceInfo *ClsTInfo = Context.CreateTypeSourceInfo(ClsQT, 0); 3604 // Now copy source location info into the type loc component. 3605 TypeLoc ClsTL = ClsTInfo->getTypeLoc(); 3606 switch (NNSLoc.getNestedNameSpecifier()->getKind()) { 3607 case NestedNameSpecifier::Identifier: 3608 assert(isa<DependentNameType>(ClsTy) && "Unexpected TypeLoc"); 3609 { 3610 DependentNameTypeLoc DNTLoc = ClsTL.castAs<DependentNameTypeLoc>(); 3611 DNTLoc.setElaboratedKeywordLoc(SourceLocation()); 3612 DNTLoc.setQualifierLoc(NNSLoc.getPrefix()); 3613 DNTLoc.setNameLoc(NNSLoc.getLocalBeginLoc()); 3614 } 3615 break; 3616 3617 case NestedNameSpecifier::TypeSpec: 3618 case NestedNameSpecifier::TypeSpecWithTemplate: 3619 if (isa<ElaboratedType>(ClsTy)) { 3620 ElaboratedTypeLoc ETLoc = ClsTL.castAs<ElaboratedTypeLoc>(); 3621 ETLoc.setElaboratedKeywordLoc(SourceLocation()); 3622 ETLoc.setQualifierLoc(NNSLoc.getPrefix()); 3623 TypeLoc NamedTL = ETLoc.getNamedTypeLoc(); 3624 NamedTL.initializeFullCopy(NNSLoc.getTypeLoc()); 3625 } else { 3626 ClsTL.initializeFullCopy(NNSLoc.getTypeLoc()); 3627 } 3628 break; 3629 3630 case NestedNameSpecifier::Namespace: 3631 case NestedNameSpecifier::NamespaceAlias: 3632 case NestedNameSpecifier::Global: 3633 llvm_unreachable("Nested-name-specifier must name a type"); 3634 } 3635 3636 // Finally fill in MemberPointerLocInfo fields. 3637 TL.setStarLoc(Chunk.Loc); 3638 TL.setClassTInfo(ClsTInfo); 3639 } 3640 void VisitLValueReferenceTypeLoc(LValueReferenceTypeLoc TL) { 3641 assert(Chunk.Kind == DeclaratorChunk::Reference); 3642 // 'Amp' is misleading: this might have been originally 3643 /// spelled with AmpAmp. 3644 TL.setAmpLoc(Chunk.Loc); 3645 } 3646 void VisitRValueReferenceTypeLoc(RValueReferenceTypeLoc TL) { 3647 assert(Chunk.Kind == DeclaratorChunk::Reference); 3648 assert(!Chunk.Ref.LValueRef); 3649 TL.setAmpAmpLoc(Chunk.Loc); 3650 } 3651 void VisitArrayTypeLoc(ArrayTypeLoc TL) { 3652 assert(Chunk.Kind == DeclaratorChunk::Array); 3653 TL.setLBracketLoc(Chunk.Loc); 3654 TL.setRBracketLoc(Chunk.EndLoc); 3655 TL.setSizeExpr(static_cast<Expr*>(Chunk.Arr.NumElts)); 3656 } 3657 void VisitFunctionTypeLoc(FunctionTypeLoc TL) { 3658 assert(Chunk.Kind == DeclaratorChunk::Function); 3659 TL.setLocalRangeBegin(Chunk.Loc); 3660 TL.setLocalRangeEnd(Chunk.EndLoc); 3661 3662 const DeclaratorChunk::FunctionTypeInfo &FTI = Chunk.Fun; 3663 TL.setLParenLoc(FTI.getLParenLoc()); 3664 TL.setRParenLoc(FTI.getRParenLoc()); 3665 for (unsigned i = 0, e = TL.getNumArgs(), tpi = 0; i != e; ++i) { 3666 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 3667 TL.setArg(tpi++, Param); 3668 } 3669 // FIXME: exception specs 3670 } 3671 void VisitParenTypeLoc(ParenTypeLoc TL) { 3672 assert(Chunk.Kind == DeclaratorChunk::Paren); 3673 TL.setLParenLoc(Chunk.Loc); 3674 TL.setRParenLoc(Chunk.EndLoc); 3675 } 3676 3677 void VisitTypeLoc(TypeLoc TL) { 3678 llvm_unreachable("unsupported TypeLoc kind in declarator!"); 3679 } 3680 }; 3681} 3682 3683static void fillAtomicQualLoc(AtomicTypeLoc ATL, const DeclaratorChunk &Chunk) { 3684 SourceLocation Loc; 3685 switch (Chunk.Kind) { 3686 case DeclaratorChunk::Function: 3687 case DeclaratorChunk::Array: 3688 case DeclaratorChunk::Paren: 3689 llvm_unreachable("cannot be _Atomic qualified"); 3690 3691 case DeclaratorChunk::Pointer: 3692 Loc = SourceLocation::getFromRawEncoding(Chunk.Ptr.AtomicQualLoc); 3693 break; 3694 3695 case DeclaratorChunk::BlockPointer: 3696 case DeclaratorChunk::Reference: 3697 case DeclaratorChunk::MemberPointer: 3698 // FIXME: Provide a source location for the _Atomic keyword. 3699 break; 3700 } 3701 3702 ATL.setKWLoc(Loc); 3703 ATL.setParensRange(SourceRange()); 3704} 3705 3706/// \brief Create and instantiate a TypeSourceInfo with type source information. 3707/// 3708/// \param T QualType referring to the type as written in source code. 3709/// 3710/// \param ReturnTypeInfo For declarators whose return type does not show 3711/// up in the normal place in the declaration specifiers (such as a C++ 3712/// conversion function), this pointer will refer to a type source information 3713/// for that return type. 3714TypeSourceInfo * 3715Sema::GetTypeSourceInfoForDeclarator(Declarator &D, QualType T, 3716 TypeSourceInfo *ReturnTypeInfo) { 3717 TypeSourceInfo *TInfo = Context.CreateTypeSourceInfo(T); 3718 UnqualTypeLoc CurrTL = TInfo->getTypeLoc().getUnqualifiedLoc(); 3719 3720 // Handle parameter packs whose type is a pack expansion. 3721 if (isa<PackExpansionType>(T)) { 3722 CurrTL.castAs<PackExpansionTypeLoc>().setEllipsisLoc(D.getEllipsisLoc()); 3723 CurrTL = CurrTL.getNextTypeLoc().getUnqualifiedLoc(); 3724 } 3725 3726 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 3727 // An AtomicTypeLoc might be produced by an atomic qualifier in this 3728 // declarator chunk. 3729 if (AtomicTypeLoc ATL = CurrTL.getAs<AtomicTypeLoc>()) { 3730 fillAtomicQualLoc(ATL, D.getTypeObject(i)); 3731 CurrTL = ATL.getValueLoc().getUnqualifiedLoc(); 3732 } 3733 3734 while (AttributedTypeLoc TL = CurrTL.getAs<AttributedTypeLoc>()) { 3735 fillAttributedTypeLoc(TL, D.getTypeObject(i).getAttrs()); 3736 CurrTL = TL.getNextTypeLoc().getUnqualifiedLoc(); 3737 } 3738 3739 DeclaratorLocFiller(Context, D.getTypeObject(i)).Visit(CurrTL); 3740 CurrTL = CurrTL.getNextTypeLoc().getUnqualifiedLoc(); 3741 } 3742 3743 // If we have different source information for the return type, use 3744 // that. This really only applies to C++ conversion functions. 3745 if (ReturnTypeInfo) { 3746 TypeLoc TL = ReturnTypeInfo->getTypeLoc(); 3747 assert(TL.getFullDataSize() == CurrTL.getFullDataSize()); 3748 memcpy(CurrTL.getOpaqueData(), TL.getOpaqueData(), TL.getFullDataSize()); 3749 } else { 3750 TypeSpecLocFiller(Context, D.getDeclSpec()).Visit(CurrTL); 3751 } 3752 3753 return TInfo; 3754} 3755 3756/// \brief Create a LocInfoType to hold the given QualType and TypeSourceInfo. 3757ParsedType Sema::CreateParsedType(QualType T, TypeSourceInfo *TInfo) { 3758 // FIXME: LocInfoTypes are "transient", only needed for passing to/from Parser 3759 // and Sema during declaration parsing. Try deallocating/caching them when 3760 // it's appropriate, instead of allocating them and keeping them around. 3761 LocInfoType *LocT = (LocInfoType*)BumpAlloc.Allocate(sizeof(LocInfoType), 3762 TypeAlignment); 3763 new (LocT) LocInfoType(T, TInfo); 3764 assert(LocT->getTypeClass() != T->getTypeClass() && 3765 "LocInfoType's TypeClass conflicts with an existing Type class"); 3766 return ParsedType::make(QualType(LocT, 0)); 3767} 3768 3769void LocInfoType::getAsStringInternal(std::string &Str, 3770 const PrintingPolicy &Policy) const { 3771 llvm_unreachable("LocInfoType leaked into the type system; an opaque TypeTy*" 3772 " was used directly instead of getting the QualType through" 3773 " GetTypeFromParser"); 3774} 3775 3776TypeResult Sema::ActOnTypeName(Scope *S, Declarator &D) { 3777 // C99 6.7.6: Type names have no identifier. This is already validated by 3778 // the parser. 3779 assert(D.getIdentifier() == 0 && "Type name should have no identifier!"); 3780 3781 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 3782 QualType T = TInfo->getType(); 3783 if (D.isInvalidType()) 3784 return true; 3785 3786 // Make sure there are no unused decl attributes on the declarator. 3787 // We don't want to do this for ObjC parameters because we're going 3788 // to apply them to the actual parameter declaration. 3789 // Likewise, we don't want to do this for alias declarations, because 3790 // we are actually going to build a declaration from this eventually. 3791 if (D.getContext() != Declarator::ObjCParameterContext && 3792 D.getContext() != Declarator::AliasDeclContext && 3793 D.getContext() != Declarator::AliasTemplateContext) 3794 checkUnusedDeclAttributes(D); 3795 3796 if (getLangOpts().CPlusPlus) { 3797 // Check that there are no default arguments (C++ only). 3798 CheckExtraCXXDefaultArguments(D); 3799 } 3800 3801 return CreateParsedType(T, TInfo); 3802} 3803 3804ParsedType Sema::ActOnObjCInstanceType(SourceLocation Loc) { 3805 QualType T = Context.getObjCInstanceType(); 3806 TypeSourceInfo *TInfo = Context.getTrivialTypeSourceInfo(T, Loc); 3807 return CreateParsedType(T, TInfo); 3808} 3809 3810 3811//===----------------------------------------------------------------------===// 3812// Type Attribute Processing 3813//===----------------------------------------------------------------------===// 3814 3815/// HandleAddressSpaceTypeAttribute - Process an address_space attribute on the 3816/// specified type. The attribute contains 1 argument, the id of the address 3817/// space for the type. 3818static void HandleAddressSpaceTypeAttribute(QualType &Type, 3819 const AttributeList &Attr, Sema &S){ 3820 3821 // If this type is already address space qualified, reject it. 3822 // ISO/IEC TR 18037 S5.3 (amending C99 6.7.3): "No type shall be qualified by 3823 // qualifiers for two or more different address spaces." 3824 if (Type.getAddressSpace()) { 3825 S.Diag(Attr.getLoc(), diag::err_attribute_address_multiple_qualifiers); 3826 Attr.setInvalid(); 3827 return; 3828 } 3829 3830 // ISO/IEC TR 18037 S5.3 (amending C99 6.7.3): "A function type shall not be 3831 // qualified by an address-space qualifier." 3832 if (Type->isFunctionType()) { 3833 S.Diag(Attr.getLoc(), diag::err_attribute_address_function_type); 3834 Attr.setInvalid(); 3835 return; 3836 } 3837 3838 // Check the attribute arguments. 3839 if (Attr.getNumArgs() != 1) { 3840 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 3841 Attr.setInvalid(); 3842 return; 3843 } 3844 Expr *ASArgExpr = static_cast<Expr *>(Attr.getArg(0)); 3845 llvm::APSInt addrSpace(32); 3846 if (ASArgExpr->isTypeDependent() || ASArgExpr->isValueDependent() || 3847 !ASArgExpr->isIntegerConstantExpr(addrSpace, S.Context)) { 3848 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_not_int) 3849 << ASArgExpr->getSourceRange(); 3850 Attr.setInvalid(); 3851 return; 3852 } 3853 3854 // Bounds checking. 3855 if (addrSpace.isSigned()) { 3856 if (addrSpace.isNegative()) { 3857 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_negative) 3858 << ASArgExpr->getSourceRange(); 3859 Attr.setInvalid(); 3860 return; 3861 } 3862 addrSpace.setIsSigned(false); 3863 } 3864 llvm::APSInt max(addrSpace.getBitWidth()); 3865 max = Qualifiers::MaxAddressSpace; 3866 if (addrSpace > max) { 3867 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_too_high) 3868 << int(Qualifiers::MaxAddressSpace) << ASArgExpr->getSourceRange(); 3869 Attr.setInvalid(); 3870 return; 3871 } 3872 3873 unsigned ASIdx = static_cast<unsigned>(addrSpace.getZExtValue()); 3874 Type = S.Context.getAddrSpaceQualType(Type, ASIdx); 3875} 3876 3877/// Does this type have a "direct" ownership qualifier? That is, 3878/// is it written like "__strong id", as opposed to something like 3879/// "typeof(foo)", where that happens to be strong? 3880static bool hasDirectOwnershipQualifier(QualType type) { 3881 // Fast path: no qualifier at all. 3882 assert(type.getQualifiers().hasObjCLifetime()); 3883 3884 while (true) { 3885 // __strong id 3886 if (const AttributedType *attr = dyn_cast<AttributedType>(type)) { 3887 if (attr->getAttrKind() == AttributedType::attr_objc_ownership) 3888 return true; 3889 3890 type = attr->getModifiedType(); 3891 3892 // X *__strong (...) 3893 } else if (const ParenType *paren = dyn_cast<ParenType>(type)) { 3894 type = paren->getInnerType(); 3895 3896 // That's it for things we want to complain about. In particular, 3897 // we do not want to look through typedefs, typeof(expr), 3898 // typeof(type), or any other way that the type is somehow 3899 // abstracted. 3900 } else { 3901 3902 return false; 3903 } 3904 } 3905} 3906 3907/// handleObjCOwnershipTypeAttr - Process an objc_ownership 3908/// attribute on the specified type. 3909/// 3910/// Returns 'true' if the attribute was handled. 3911static bool handleObjCOwnershipTypeAttr(TypeProcessingState &state, 3912 AttributeList &attr, 3913 QualType &type) { 3914 bool NonObjCPointer = false; 3915 3916 if (!type->isDependentType() && !type->isUndeducedType()) { 3917 if (const PointerType *ptr = type->getAs<PointerType>()) { 3918 QualType pointee = ptr->getPointeeType(); 3919 if (pointee->isObjCRetainableType() || pointee->isPointerType()) 3920 return false; 3921 // It is important not to lose the source info that there was an attribute 3922 // applied to non-objc pointer. We will create an attributed type but 3923 // its type will be the same as the original type. 3924 NonObjCPointer = true; 3925 } else if (!type->isObjCRetainableType()) { 3926 return false; 3927 } 3928 3929 // Don't accept an ownership attribute in the declspec if it would 3930 // just be the return type of a block pointer. 3931 if (state.isProcessingDeclSpec()) { 3932 Declarator &D = state.getDeclarator(); 3933 if (maybeMovePastReturnType(D, D.getNumTypeObjects())) 3934 return false; 3935 } 3936 } 3937 3938 Sema &S = state.getSema(); 3939 SourceLocation AttrLoc = attr.getLoc(); 3940 if (AttrLoc.isMacroID()) 3941 AttrLoc = S.getSourceManager().getImmediateExpansionRange(AttrLoc).first; 3942 3943 if (!attr.getParameterName()) { 3944 S.Diag(AttrLoc, diag::err_attribute_argument_n_not_string) 3945 << "objc_ownership" << 1; 3946 attr.setInvalid(); 3947 return true; 3948 } 3949 3950 // Consume lifetime attributes without further comment outside of 3951 // ARC mode. 3952 if (!S.getLangOpts().ObjCAutoRefCount) 3953 return true; 3954 3955 Qualifiers::ObjCLifetime lifetime; 3956 if (attr.getParameterName()->isStr("none")) 3957 lifetime = Qualifiers::OCL_ExplicitNone; 3958 else if (attr.getParameterName()->isStr("strong")) 3959 lifetime = Qualifiers::OCL_Strong; 3960 else if (attr.getParameterName()->isStr("weak")) 3961 lifetime = Qualifiers::OCL_Weak; 3962 else if (attr.getParameterName()->isStr("autoreleasing")) 3963 lifetime = Qualifiers::OCL_Autoreleasing; 3964 else { 3965 S.Diag(AttrLoc, diag::warn_attribute_type_not_supported) 3966 << "objc_ownership" << attr.getParameterName(); 3967 attr.setInvalid(); 3968 return true; 3969 } 3970 3971 SplitQualType underlyingType = type.split(); 3972 3973 // Check for redundant/conflicting ownership qualifiers. 3974 if (Qualifiers::ObjCLifetime previousLifetime 3975 = type.getQualifiers().getObjCLifetime()) { 3976 // If it's written directly, that's an error. 3977 if (hasDirectOwnershipQualifier(type)) { 3978 S.Diag(AttrLoc, diag::err_attr_objc_ownership_redundant) 3979 << type; 3980 return true; 3981 } 3982 3983 // Otherwise, if the qualifiers actually conflict, pull sugar off 3984 // until we reach a type that is directly qualified. 3985 if (previousLifetime != lifetime) { 3986 // This should always terminate: the canonical type is 3987 // qualified, so some bit of sugar must be hiding it. 3988 while (!underlyingType.Quals.hasObjCLifetime()) { 3989 underlyingType = underlyingType.getSingleStepDesugaredType(); 3990 } 3991 underlyingType.Quals.removeObjCLifetime(); 3992 } 3993 } 3994 3995 underlyingType.Quals.addObjCLifetime(lifetime); 3996 3997 if (NonObjCPointer) { 3998 StringRef name = attr.getName()->getName(); 3999 switch (lifetime) { 4000 case Qualifiers::OCL_None: 4001 case Qualifiers::OCL_ExplicitNone: 4002 break; 4003 case Qualifiers::OCL_Strong: name = "__strong"; break; 4004 case Qualifiers::OCL_Weak: name = "__weak"; break; 4005 case Qualifiers::OCL_Autoreleasing: name = "__autoreleasing"; break; 4006 } 4007 S.Diag(AttrLoc, diag::warn_objc_object_attribute_wrong_type) 4008 << name << type; 4009 } 4010 4011 QualType origType = type; 4012 if (!NonObjCPointer) 4013 type = S.Context.getQualifiedType(underlyingType); 4014 4015 // If we have a valid source location for the attribute, use an 4016 // AttributedType instead. 4017 if (AttrLoc.isValid()) 4018 type = S.Context.getAttributedType(AttributedType::attr_objc_ownership, 4019 origType, type); 4020 4021 // Forbid __weak if the runtime doesn't support it. 4022 if (lifetime == Qualifiers::OCL_Weak && 4023 !S.getLangOpts().ObjCARCWeak && !NonObjCPointer) { 4024 4025 // Actually, delay this until we know what we're parsing. 4026 if (S.DelayedDiagnostics.shouldDelayDiagnostics()) { 4027 S.DelayedDiagnostics.add( 4028 sema::DelayedDiagnostic::makeForbiddenType( 4029 S.getSourceManager().getExpansionLoc(AttrLoc), 4030 diag::err_arc_weak_no_runtime, type, /*ignored*/ 0)); 4031 } else { 4032 S.Diag(AttrLoc, diag::err_arc_weak_no_runtime); 4033 } 4034 4035 attr.setInvalid(); 4036 return true; 4037 } 4038 4039 // Forbid __weak for class objects marked as 4040 // objc_arc_weak_reference_unavailable 4041 if (lifetime == Qualifiers::OCL_Weak) { 4042 if (const ObjCObjectPointerType *ObjT = 4043 type->getAs<ObjCObjectPointerType>()) { 4044 if (ObjCInterfaceDecl *Class = ObjT->getInterfaceDecl()) { 4045 if (Class->isArcWeakrefUnavailable()) { 4046 S.Diag(AttrLoc, diag::err_arc_unsupported_weak_class); 4047 S.Diag(ObjT->getInterfaceDecl()->getLocation(), 4048 diag::note_class_declared); 4049 } 4050 } 4051 } 4052 } 4053 4054 return true; 4055} 4056 4057/// handleObjCGCTypeAttr - Process the __attribute__((objc_gc)) type 4058/// attribute on the specified type. Returns true to indicate that 4059/// the attribute was handled, false to indicate that the type does 4060/// not permit the attribute. 4061static bool handleObjCGCTypeAttr(TypeProcessingState &state, 4062 AttributeList &attr, 4063 QualType &type) { 4064 Sema &S = state.getSema(); 4065 4066 // Delay if this isn't some kind of pointer. 4067 if (!type->isPointerType() && 4068 !type->isObjCObjectPointerType() && 4069 !type->isBlockPointerType()) 4070 return false; 4071 4072 if (type.getObjCGCAttr() != Qualifiers::GCNone) { 4073 S.Diag(attr.getLoc(), diag::err_attribute_multiple_objc_gc); 4074 attr.setInvalid(); 4075 return true; 4076 } 4077 4078 // Check the attribute arguments. 4079 if (!attr.getParameterName()) { 4080 S.Diag(attr.getLoc(), diag::err_attribute_argument_n_not_string) 4081 << "objc_gc" << 1; 4082 attr.setInvalid(); 4083 return true; 4084 } 4085 Qualifiers::GC GCAttr; 4086 if (attr.getNumArgs() != 0) { 4087 S.Diag(attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 4088 attr.setInvalid(); 4089 return true; 4090 } 4091 if (attr.getParameterName()->isStr("weak")) 4092 GCAttr = Qualifiers::Weak; 4093 else if (attr.getParameterName()->isStr("strong")) 4094 GCAttr = Qualifiers::Strong; 4095 else { 4096 S.Diag(attr.getLoc(), diag::warn_attribute_type_not_supported) 4097 << "objc_gc" << attr.getParameterName(); 4098 attr.setInvalid(); 4099 return true; 4100 } 4101 4102 QualType origType = type; 4103 type = S.Context.getObjCGCQualType(origType, GCAttr); 4104 4105 // Make an attributed type to preserve the source information. 4106 if (attr.getLoc().isValid()) 4107 type = S.Context.getAttributedType(AttributedType::attr_objc_gc, 4108 origType, type); 4109 4110 return true; 4111} 4112 4113namespace { 4114 /// A helper class to unwrap a type down to a function for the 4115 /// purposes of applying attributes there. 4116 /// 4117 /// Use: 4118 /// FunctionTypeUnwrapper unwrapped(SemaRef, T); 4119 /// if (unwrapped.isFunctionType()) { 4120 /// const FunctionType *fn = unwrapped.get(); 4121 /// // change fn somehow 4122 /// T = unwrapped.wrap(fn); 4123 /// } 4124 struct FunctionTypeUnwrapper { 4125 enum WrapKind { 4126 Desugar, 4127 Parens, 4128 Pointer, 4129 BlockPointer, 4130 Reference, 4131 MemberPointer 4132 }; 4133 4134 QualType Original; 4135 const FunctionType *Fn; 4136 SmallVector<unsigned char /*WrapKind*/, 8> Stack; 4137 4138 FunctionTypeUnwrapper(Sema &S, QualType T) : Original(T) { 4139 while (true) { 4140 const Type *Ty = T.getTypePtr(); 4141 if (isa<FunctionType>(Ty)) { 4142 Fn = cast<FunctionType>(Ty); 4143 return; 4144 } else if (isa<ParenType>(Ty)) { 4145 T = cast<ParenType>(Ty)->getInnerType(); 4146 Stack.push_back(Parens); 4147 } else if (isa<PointerType>(Ty)) { 4148 T = cast<PointerType>(Ty)->getPointeeType(); 4149 Stack.push_back(Pointer); 4150 } else if (isa<BlockPointerType>(Ty)) { 4151 T = cast<BlockPointerType>(Ty)->getPointeeType(); 4152 Stack.push_back(BlockPointer); 4153 } else if (isa<MemberPointerType>(Ty)) { 4154 T = cast<MemberPointerType>(Ty)->getPointeeType(); 4155 Stack.push_back(MemberPointer); 4156 } else if (isa<ReferenceType>(Ty)) { 4157 T = cast<ReferenceType>(Ty)->getPointeeType(); 4158 Stack.push_back(Reference); 4159 } else { 4160 const Type *DTy = Ty->getUnqualifiedDesugaredType(); 4161 if (Ty == DTy) { 4162 Fn = 0; 4163 return; 4164 } 4165 4166 T = QualType(DTy, 0); 4167 Stack.push_back(Desugar); 4168 } 4169 } 4170 } 4171 4172 bool isFunctionType() const { return (Fn != 0); } 4173 const FunctionType *get() const { return Fn; } 4174 4175 QualType wrap(Sema &S, const FunctionType *New) { 4176 // If T wasn't modified from the unwrapped type, do nothing. 4177 if (New == get()) return Original; 4178 4179 Fn = New; 4180 return wrap(S.Context, Original, 0); 4181 } 4182 4183 private: 4184 QualType wrap(ASTContext &C, QualType Old, unsigned I) { 4185 if (I == Stack.size()) 4186 return C.getQualifiedType(Fn, Old.getQualifiers()); 4187 4188 // Build up the inner type, applying the qualifiers from the old 4189 // type to the new type. 4190 SplitQualType SplitOld = Old.split(); 4191 4192 // As a special case, tail-recurse if there are no qualifiers. 4193 if (SplitOld.Quals.empty()) 4194 return wrap(C, SplitOld.Ty, I); 4195 return C.getQualifiedType(wrap(C, SplitOld.Ty, I), SplitOld.Quals); 4196 } 4197 4198 QualType wrap(ASTContext &C, const Type *Old, unsigned I) { 4199 if (I == Stack.size()) return QualType(Fn, 0); 4200 4201 switch (static_cast<WrapKind>(Stack[I++])) { 4202 case Desugar: 4203 // This is the point at which we potentially lose source 4204 // information. 4205 return wrap(C, Old->getUnqualifiedDesugaredType(), I); 4206 4207 case Parens: { 4208 QualType New = wrap(C, cast<ParenType>(Old)->getInnerType(), I); 4209 return C.getParenType(New); 4210 } 4211 4212 case Pointer: { 4213 QualType New = wrap(C, cast<PointerType>(Old)->getPointeeType(), I); 4214 return C.getPointerType(New); 4215 } 4216 4217 case BlockPointer: { 4218 QualType New = wrap(C, cast<BlockPointerType>(Old)->getPointeeType(),I); 4219 return C.getBlockPointerType(New); 4220 } 4221 4222 case MemberPointer: { 4223 const MemberPointerType *OldMPT = cast<MemberPointerType>(Old); 4224 QualType New = wrap(C, OldMPT->getPointeeType(), I); 4225 return C.getMemberPointerType(New, OldMPT->getClass()); 4226 } 4227 4228 case Reference: { 4229 const ReferenceType *OldRef = cast<ReferenceType>(Old); 4230 QualType New = wrap(C, OldRef->getPointeeType(), I); 4231 if (isa<LValueReferenceType>(OldRef)) 4232 return C.getLValueReferenceType(New, OldRef->isSpelledAsLValue()); 4233 else 4234 return C.getRValueReferenceType(New); 4235 } 4236 } 4237 4238 llvm_unreachable("unknown wrapping kind"); 4239 } 4240 }; 4241} 4242 4243static bool handleMSPointerTypeQualifierAttr(TypeProcessingState &State, 4244 AttributeList &Attr, 4245 QualType &Type) { 4246 Sema &S = State.getSema(); 4247 4248 AttributeList::Kind Kind = Attr.getKind(); 4249 QualType Desugared = Type; 4250 const AttributedType *AT = dyn_cast<AttributedType>(Type); 4251 while (AT) { 4252 AttributedType::Kind CurAttrKind = AT->getAttrKind(); 4253 4254 // You cannot specify duplicate type attributes, so if the attribute has 4255 // already been applied, flag it. 4256 if (getAttrListKind(CurAttrKind) == Kind) { 4257 S.Diag(Attr.getLoc(), diag::warn_duplicate_attribute_exact) 4258 << Attr.getName(); 4259 return true; 4260 } 4261 4262 // You cannot have both __sptr and __uptr on the same type, nor can you 4263 // have __ptr32 and __ptr64. 4264 if ((CurAttrKind == AttributedType::attr_ptr32 && 4265 Kind == AttributeList::AT_Ptr64) || 4266 (CurAttrKind == AttributedType::attr_ptr64 && 4267 Kind == AttributeList::AT_Ptr32)) { 4268 S.Diag(Attr.getLoc(), diag::err_attributes_are_not_compatible) 4269 << "'__ptr32'" << "'__ptr64'"; 4270 return true; 4271 } else if ((CurAttrKind == AttributedType::attr_sptr && 4272 Kind == AttributeList::AT_UPtr) || 4273 (CurAttrKind == AttributedType::attr_uptr && 4274 Kind == AttributeList::AT_SPtr)) { 4275 S.Diag(Attr.getLoc(), diag::err_attributes_are_not_compatible) 4276 << "'__sptr'" << "'__uptr'"; 4277 return true; 4278 } 4279 4280 Desugared = AT->getEquivalentType(); 4281 AT = dyn_cast<AttributedType>(Desugared); 4282 } 4283 4284 // Pointer type qualifiers can only operate on pointer types, but not 4285 // pointer-to-member types. 4286 if (!isa<PointerType>(Desugared)) { 4287 S.Diag(Attr.getLoc(), Type->isMemberPointerType() ? 4288 diag::err_attribute_no_member_pointers : 4289 diag::err_attribute_pointers_only) << Attr.getName(); 4290 return true; 4291 } 4292 4293 AttributedType::Kind TAK; 4294 switch (Kind) { 4295 default: llvm_unreachable("Unknown attribute kind"); 4296 case AttributeList::AT_Ptr32: TAK = AttributedType::attr_ptr32; break; 4297 case AttributeList::AT_Ptr64: TAK = AttributedType::attr_ptr64; break; 4298 case AttributeList::AT_SPtr: TAK = AttributedType::attr_sptr; break; 4299 case AttributeList::AT_UPtr: TAK = AttributedType::attr_uptr; break; 4300 } 4301 4302 Type = S.Context.getAttributedType(TAK, Type, Type); 4303 return false; 4304} 4305 4306/// Process an individual function attribute. Returns true to 4307/// indicate that the attribute was handled, false if it wasn't. 4308static bool handleFunctionTypeAttr(TypeProcessingState &state, 4309 AttributeList &attr, 4310 QualType &type) { 4311 Sema &S = state.getSema(); 4312 4313 FunctionTypeUnwrapper unwrapped(S, type); 4314 4315 if (attr.getKind() == AttributeList::AT_NoReturn) { 4316 if (S.CheckNoReturnAttr(attr)) 4317 return true; 4318 4319 // Delay if this is not a function type. 4320 if (!unwrapped.isFunctionType()) 4321 return false; 4322 4323 // Otherwise we can process right away. 4324 FunctionType::ExtInfo EI = unwrapped.get()->getExtInfo().withNoReturn(true); 4325 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 4326 return true; 4327 } 4328 4329 // ns_returns_retained is not always a type attribute, but if we got 4330 // here, we're treating it as one right now. 4331 if (attr.getKind() == AttributeList::AT_NSReturnsRetained) { 4332 assert(S.getLangOpts().ObjCAutoRefCount && 4333 "ns_returns_retained treated as type attribute in non-ARC"); 4334 if (attr.getNumArgs()) return true; 4335 4336 // Delay if this is not a function type. 4337 if (!unwrapped.isFunctionType()) 4338 return false; 4339 4340 FunctionType::ExtInfo EI 4341 = unwrapped.get()->getExtInfo().withProducesResult(true); 4342 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 4343 return true; 4344 } 4345 4346 if (attr.getKind() == AttributeList::AT_Regparm) { 4347 unsigned value; 4348 if (S.CheckRegparmAttr(attr, value)) 4349 return true; 4350 4351 // Delay if this is not a function type. 4352 if (!unwrapped.isFunctionType()) 4353 return false; 4354 4355 // Diagnose regparm with fastcall. 4356 const FunctionType *fn = unwrapped.get(); 4357 CallingConv CC = fn->getCallConv(); 4358 if (CC == CC_X86FastCall) { 4359 S.Diag(attr.getLoc(), diag::err_attributes_are_not_compatible) 4360 << FunctionType::getNameForCallConv(CC) 4361 << "regparm"; 4362 attr.setInvalid(); 4363 return true; 4364 } 4365 4366 FunctionType::ExtInfo EI = 4367 unwrapped.get()->getExtInfo().withRegParm(value); 4368 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 4369 return true; 4370 } 4371 4372 // Delay if the type didn't work out to a function. 4373 if (!unwrapped.isFunctionType()) return false; 4374 4375 // Otherwise, a calling convention. 4376 CallingConv CC; 4377 if (S.CheckCallingConvAttr(attr, CC)) 4378 return true; 4379 4380 const FunctionType *fn = unwrapped.get(); 4381 CallingConv CCOld = fn->getCallConv(); 4382 if (S.Context.getCanonicalCallConv(CC) == 4383 S.Context.getCanonicalCallConv(CCOld)) { 4384 FunctionType::ExtInfo EI= unwrapped.get()->getExtInfo().withCallingConv(CC); 4385 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 4386 return true; 4387 } 4388 4389 if (CCOld != (S.LangOpts.MRTD ? CC_X86StdCall : CC_Default)) { 4390 // Should we diagnose reapplications of the same convention? 4391 S.Diag(attr.getLoc(), diag::err_attributes_are_not_compatible) 4392 << FunctionType::getNameForCallConv(CC) 4393 << FunctionType::getNameForCallConv(CCOld); 4394 attr.setInvalid(); 4395 return true; 4396 } 4397 4398 // Diagnose the use of X86 fastcall on varargs or unprototyped functions. 4399 if (CC == CC_X86FastCall) { 4400 if (isa<FunctionNoProtoType>(fn)) { 4401 S.Diag(attr.getLoc(), diag::err_cconv_knr) 4402 << FunctionType::getNameForCallConv(CC); 4403 attr.setInvalid(); 4404 return true; 4405 } 4406 4407 const FunctionProtoType *FnP = cast<FunctionProtoType>(fn); 4408 if (FnP->isVariadic()) { 4409 S.Diag(attr.getLoc(), diag::err_cconv_varargs) 4410 << FunctionType::getNameForCallConv(CC); 4411 attr.setInvalid(); 4412 return true; 4413 } 4414 4415 // Also diagnose fastcall with regparm. 4416 if (fn->getHasRegParm()) { 4417 S.Diag(attr.getLoc(), diag::err_attributes_are_not_compatible) 4418 << "regparm" 4419 << FunctionType::getNameForCallConv(CC); 4420 attr.setInvalid(); 4421 return true; 4422 } 4423 } 4424 4425 FunctionType::ExtInfo EI = unwrapped.get()->getExtInfo().withCallingConv(CC); 4426 type = unwrapped.wrap(S, S.Context.adjustFunctionType(unwrapped.get(), EI)); 4427 return true; 4428} 4429 4430/// Handle OpenCL image access qualifiers: read_only, write_only, read_write 4431static void HandleOpenCLImageAccessAttribute(QualType& CurType, 4432 const AttributeList &Attr, 4433 Sema &S) { 4434 // Check the attribute arguments. 4435 if (Attr.getNumArgs() != 1) { 4436 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 4437 Attr.setInvalid(); 4438 return; 4439 } 4440 Expr *sizeExpr = static_cast<Expr *>(Attr.getArg(0)); 4441 llvm::APSInt arg(32); 4442 if (sizeExpr->isTypeDependent() || sizeExpr->isValueDependent() || 4443 !sizeExpr->isIntegerConstantExpr(arg, S.Context)) { 4444 S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int) 4445 << "opencl_image_access" << sizeExpr->getSourceRange(); 4446 Attr.setInvalid(); 4447 return; 4448 } 4449 unsigned iarg = static_cast<unsigned>(arg.getZExtValue()); 4450 switch (iarg) { 4451 case CLIA_read_only: 4452 case CLIA_write_only: 4453 case CLIA_read_write: 4454 // Implemented in a separate patch 4455 break; 4456 default: 4457 // Implemented in a separate patch 4458 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_size) 4459 << sizeExpr->getSourceRange(); 4460 Attr.setInvalid(); 4461 break; 4462 } 4463} 4464 4465/// HandleVectorSizeAttribute - this attribute is only applicable to integral 4466/// and float scalars, although arrays, pointers, and function return values are 4467/// allowed in conjunction with this construct. Aggregates with this attribute 4468/// are invalid, even if they are of the same size as a corresponding scalar. 4469/// The raw attribute should contain precisely 1 argument, the vector size for 4470/// the variable, measured in bytes. If curType and rawAttr are well formed, 4471/// this routine will return a new vector type. 4472static void HandleVectorSizeAttr(QualType& CurType, const AttributeList &Attr, 4473 Sema &S) { 4474 // Check the attribute arguments. 4475 if (Attr.getNumArgs() != 1) { 4476 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 4477 Attr.setInvalid(); 4478 return; 4479 } 4480 Expr *sizeExpr = static_cast<Expr *>(Attr.getArg(0)); 4481 llvm::APSInt vecSize(32); 4482 if (sizeExpr->isTypeDependent() || sizeExpr->isValueDependent() || 4483 !sizeExpr->isIntegerConstantExpr(vecSize, S.Context)) { 4484 S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int) 4485 << "vector_size" << sizeExpr->getSourceRange(); 4486 Attr.setInvalid(); 4487 return; 4488 } 4489 // the base type must be integer or float, and can't already be a vector. 4490 if (!CurType->isIntegerType() && !CurType->isRealFloatingType()) { 4491 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_vector_type) << CurType; 4492 Attr.setInvalid(); 4493 return; 4494 } 4495 unsigned typeSize = static_cast<unsigned>(S.Context.getTypeSize(CurType)); 4496 // vecSize is specified in bytes - convert to bits. 4497 unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue() * 8); 4498 4499 // the vector size needs to be an integral multiple of the type size. 4500 if (vectorSize % typeSize) { 4501 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_size) 4502 << sizeExpr->getSourceRange(); 4503 Attr.setInvalid(); 4504 return; 4505 } 4506 if (vectorSize == 0) { 4507 S.Diag(Attr.getLoc(), diag::err_attribute_zero_size) 4508 << sizeExpr->getSourceRange(); 4509 Attr.setInvalid(); 4510 return; 4511 } 4512 4513 // Success! Instantiate the vector type, the number of elements is > 0, and 4514 // not required to be a power of 2, unlike GCC. 4515 CurType = S.Context.getVectorType(CurType, vectorSize/typeSize, 4516 VectorType::GenericVector); 4517} 4518 4519/// \brief Process the OpenCL-like ext_vector_type attribute when it occurs on 4520/// a type. 4521static void HandleExtVectorTypeAttr(QualType &CurType, 4522 const AttributeList &Attr, 4523 Sema &S) { 4524 Expr *sizeExpr; 4525 4526 // Special case where the argument is a template id. 4527 if (Attr.getParameterName()) { 4528 CXXScopeSpec SS; 4529 SourceLocation TemplateKWLoc; 4530 UnqualifiedId id; 4531 id.setIdentifier(Attr.getParameterName(), Attr.getLoc()); 4532 4533 ExprResult Size = S.ActOnIdExpression(S.getCurScope(), SS, TemplateKWLoc, 4534 id, false, false); 4535 if (Size.isInvalid()) 4536 return; 4537 4538 sizeExpr = Size.get(); 4539 } else { 4540 // check the attribute arguments. 4541 if (Attr.getNumArgs() != 1) { 4542 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 4543 return; 4544 } 4545 sizeExpr = Attr.getArg(0); 4546 } 4547 4548 // Create the vector type. 4549 QualType T = S.BuildExtVectorType(CurType, sizeExpr, Attr.getLoc()); 4550 if (!T.isNull()) 4551 CurType = T; 4552} 4553 4554/// HandleNeonVectorTypeAttr - The "neon_vector_type" and 4555/// "neon_polyvector_type" attributes are used to create vector types that 4556/// are mangled according to ARM's ABI. Otherwise, these types are identical 4557/// to those created with the "vector_size" attribute. Unlike "vector_size" 4558/// the argument to these Neon attributes is the number of vector elements, 4559/// not the vector size in bytes. The vector width and element type must 4560/// match one of the standard Neon vector types. 4561static void HandleNeonVectorTypeAttr(QualType& CurType, 4562 const AttributeList &Attr, Sema &S, 4563 VectorType::VectorKind VecKind, 4564 const char *AttrName) { 4565 // Check the attribute arguments. 4566 if (Attr.getNumArgs() != 1) { 4567 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 4568 Attr.setInvalid(); 4569 return; 4570 } 4571 // The number of elements must be an ICE. 4572 Expr *numEltsExpr = static_cast<Expr *>(Attr.getArg(0)); 4573 llvm::APSInt numEltsInt(32); 4574 if (numEltsExpr->isTypeDependent() || numEltsExpr->isValueDependent() || 4575 !numEltsExpr->isIntegerConstantExpr(numEltsInt, S.Context)) { 4576 S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int) 4577 << AttrName << numEltsExpr->getSourceRange(); 4578 Attr.setInvalid(); 4579 return; 4580 } 4581 // Only certain element types are supported for Neon vectors. 4582 const BuiltinType* BTy = CurType->getAs<BuiltinType>(); 4583 if (!BTy || 4584 (VecKind == VectorType::NeonPolyVector && 4585 BTy->getKind() != BuiltinType::SChar && 4586 BTy->getKind() != BuiltinType::Short) || 4587 (BTy->getKind() != BuiltinType::SChar && 4588 BTy->getKind() != BuiltinType::UChar && 4589 BTy->getKind() != BuiltinType::Short && 4590 BTy->getKind() != BuiltinType::UShort && 4591 BTy->getKind() != BuiltinType::Int && 4592 BTy->getKind() != BuiltinType::UInt && 4593 BTy->getKind() != BuiltinType::LongLong && 4594 BTy->getKind() != BuiltinType::ULongLong && 4595 BTy->getKind() != BuiltinType::Float)) { 4596 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_vector_type) <<CurType; 4597 Attr.setInvalid(); 4598 return; 4599 } 4600 // The total size of the vector must be 64 or 128 bits. 4601 unsigned typeSize = static_cast<unsigned>(S.Context.getTypeSize(CurType)); 4602 unsigned numElts = static_cast<unsigned>(numEltsInt.getZExtValue()); 4603 unsigned vecSize = typeSize * numElts; 4604 if (vecSize != 64 && vecSize != 128) { 4605 S.Diag(Attr.getLoc(), diag::err_attribute_bad_neon_vector_size) << CurType; 4606 Attr.setInvalid(); 4607 return; 4608 } 4609 4610 CurType = S.Context.getVectorType(CurType, numElts, VecKind); 4611} 4612 4613static void processTypeAttrs(TypeProcessingState &state, QualType &type, 4614 TypeAttrLocation TAL, AttributeList *attrs) { 4615 // Scan through and apply attributes to this type where it makes sense. Some 4616 // attributes (such as __address_space__, __vector_size__, etc) apply to the 4617 // type, but others can be present in the type specifiers even though they 4618 // apply to the decl. Here we apply type attributes and ignore the rest. 4619 4620 AttributeList *next; 4621 do { 4622 AttributeList &attr = *attrs; 4623 next = attr.getNext(); 4624 4625 // Skip attributes that were marked to be invalid. 4626 if (attr.isInvalid()) 4627 continue; 4628 4629 if (attr.isCXX11Attribute()) { 4630 // [[gnu::...]] attributes are treated as declaration attributes, so may 4631 // not appertain to a DeclaratorChunk, even if we handle them as type 4632 // attributes. 4633 if (attr.getScopeName() && attr.getScopeName()->isStr("gnu")) { 4634 if (TAL == TAL_DeclChunk) { 4635 state.getSema().Diag(attr.getLoc(), 4636 diag::warn_cxx11_gnu_attribute_on_type) 4637 << attr.getName(); 4638 continue; 4639 } 4640 } else if (TAL != TAL_DeclChunk) { 4641 // Otherwise, only consider type processing for a C++11 attribute if 4642 // it's actually been applied to a type. 4643 continue; 4644 } 4645 } 4646 4647 // If this is an attribute we can handle, do so now, 4648 // otherwise, add it to the FnAttrs list for rechaining. 4649 switch (attr.getKind()) { 4650 default: 4651 // A C++11 attribute on a declarator chunk must appertain to a type. 4652 if (attr.isCXX11Attribute() && TAL == TAL_DeclChunk) { 4653 state.getSema().Diag(attr.getLoc(), diag::err_attribute_not_type_attr) 4654 << attr.getName(); 4655 attr.setUsedAsTypeAttr(); 4656 } 4657 break; 4658 4659 case AttributeList::UnknownAttribute: 4660 if (attr.isCXX11Attribute() && TAL == TAL_DeclChunk) 4661 state.getSema().Diag(attr.getLoc(), 4662 diag::warn_unknown_attribute_ignored) 4663 << attr.getName(); 4664 break; 4665 4666 case AttributeList::IgnoredAttribute: 4667 break; 4668 4669 case AttributeList::AT_MayAlias: 4670 // FIXME: This attribute needs to actually be handled, but if we ignore 4671 // it it breaks large amounts of Linux software. 4672 attr.setUsedAsTypeAttr(); 4673 break; 4674 case AttributeList::AT_AddressSpace: 4675 HandleAddressSpaceTypeAttribute(type, attr, state.getSema()); 4676 attr.setUsedAsTypeAttr(); 4677 break; 4678 OBJC_POINTER_TYPE_ATTRS_CASELIST: 4679 if (!handleObjCPointerTypeAttr(state, attr, type)) 4680 distributeObjCPointerTypeAttr(state, attr, type); 4681 attr.setUsedAsTypeAttr(); 4682 break; 4683 case AttributeList::AT_VectorSize: 4684 HandleVectorSizeAttr(type, attr, state.getSema()); 4685 attr.setUsedAsTypeAttr(); 4686 break; 4687 case AttributeList::AT_ExtVectorType: 4688 HandleExtVectorTypeAttr(type, attr, state.getSema()); 4689 attr.setUsedAsTypeAttr(); 4690 break; 4691 case AttributeList::AT_NeonVectorType: 4692 HandleNeonVectorTypeAttr(type, attr, state.getSema(), 4693 VectorType::NeonVector, "neon_vector_type"); 4694 attr.setUsedAsTypeAttr(); 4695 break; 4696 case AttributeList::AT_NeonPolyVectorType: 4697 HandleNeonVectorTypeAttr(type, attr, state.getSema(), 4698 VectorType::NeonPolyVector, 4699 "neon_polyvector_type"); 4700 attr.setUsedAsTypeAttr(); 4701 break; 4702 case AttributeList::AT_OpenCLImageAccess: 4703 HandleOpenCLImageAccessAttribute(type, attr, state.getSema()); 4704 attr.setUsedAsTypeAttr(); 4705 break; 4706 4707 case AttributeList::AT_Win64: 4708 attr.setUsedAsTypeAttr(); 4709 break; 4710 MS_TYPE_ATTRS_CASELIST: 4711 if (!handleMSPointerTypeQualifierAttr(state, attr, type)) 4712 attr.setUsedAsTypeAttr(); 4713 break; 4714 4715 case AttributeList::AT_NSReturnsRetained: 4716 if (!state.getSema().getLangOpts().ObjCAutoRefCount) 4717 break; 4718 // fallthrough into the function attrs 4719 4720 FUNCTION_TYPE_ATTRS_CASELIST: 4721 attr.setUsedAsTypeAttr(); 4722 4723 // Never process function type attributes as part of the 4724 // declaration-specifiers. 4725 if (TAL == TAL_DeclSpec) 4726 distributeFunctionTypeAttrFromDeclSpec(state, attr, type); 4727 4728 // Otherwise, handle the possible delays. 4729 else if (!handleFunctionTypeAttr(state, attr, type)) 4730 distributeFunctionTypeAttr(state, attr, type); 4731 break; 4732 } 4733 } while ((attrs = next)); 4734} 4735 4736/// \brief Ensure that the type of the given expression is complete. 4737/// 4738/// This routine checks whether the expression \p E has a complete type. If the 4739/// expression refers to an instantiable construct, that instantiation is 4740/// performed as needed to complete its type. Furthermore 4741/// Sema::RequireCompleteType is called for the expression's type (or in the 4742/// case of a reference type, the referred-to type). 4743/// 4744/// \param E The expression whose type is required to be complete. 4745/// \param Diagnoser The object that will emit a diagnostic if the type is 4746/// incomplete. 4747/// 4748/// \returns \c true if the type of \p E is incomplete and diagnosed, \c false 4749/// otherwise. 4750bool Sema::RequireCompleteExprType(Expr *E, TypeDiagnoser &Diagnoser){ 4751 QualType T = E->getType(); 4752 4753 // Fast path the case where the type is already complete. 4754 if (!T->isIncompleteType()) 4755 return false; 4756 4757 // Incomplete array types may be completed by the initializer attached to 4758 // their definitions. For static data members of class templates we need to 4759 // instantiate the definition to get this initializer and complete the type. 4760 if (T->isIncompleteArrayType()) { 4761 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E->IgnoreParens())) { 4762 if (VarDecl *Var = dyn_cast<VarDecl>(DRE->getDecl())) { 4763 if (Var->isStaticDataMember() && 4764 Var->getInstantiatedFromStaticDataMember()) { 4765 4766 MemberSpecializationInfo *MSInfo = Var->getMemberSpecializationInfo(); 4767 assert(MSInfo && "Missing member specialization information?"); 4768 if (MSInfo->getTemplateSpecializationKind() 4769 != TSK_ExplicitSpecialization) { 4770 // If we don't already have a point of instantiation, this is it. 4771 if (MSInfo->getPointOfInstantiation().isInvalid()) { 4772 MSInfo->setPointOfInstantiation(E->getLocStart()); 4773 4774 // This is a modification of an existing AST node. Notify 4775 // listeners. 4776 if (ASTMutationListener *L = getASTMutationListener()) 4777 L->StaticDataMemberInstantiated(Var); 4778 } 4779 4780 InstantiateStaticDataMemberDefinition(E->getExprLoc(), Var); 4781 4782 // Update the type to the newly instantiated definition's type both 4783 // here and within the expression. 4784 if (VarDecl *Def = Var->getDefinition()) { 4785 DRE->setDecl(Def); 4786 T = Def->getType(); 4787 DRE->setType(T); 4788 E->setType(T); 4789 } 4790 } 4791 4792 // We still go on to try to complete the type independently, as it 4793 // may also require instantiations or diagnostics if it remains 4794 // incomplete. 4795 } 4796 } 4797 } 4798 } 4799 4800 // FIXME: Are there other cases which require instantiating something other 4801 // than the type to complete the type of an expression? 4802 4803 // Look through reference types and complete the referred type. 4804 if (const ReferenceType *Ref = T->getAs<ReferenceType>()) 4805 T = Ref->getPointeeType(); 4806 4807 return RequireCompleteType(E->getExprLoc(), T, Diagnoser); 4808} 4809 4810namespace { 4811 struct TypeDiagnoserDiag : Sema::TypeDiagnoser { 4812 unsigned DiagID; 4813 4814 TypeDiagnoserDiag(unsigned DiagID) 4815 : Sema::TypeDiagnoser(DiagID == 0), DiagID(DiagID) {} 4816 4817 virtual void diagnose(Sema &S, SourceLocation Loc, QualType T) { 4818 if (Suppressed) return; 4819 S.Diag(Loc, DiagID) << T; 4820 } 4821 }; 4822} 4823 4824bool Sema::RequireCompleteExprType(Expr *E, unsigned DiagID) { 4825 TypeDiagnoserDiag Diagnoser(DiagID); 4826 return RequireCompleteExprType(E, Diagnoser); 4827} 4828 4829/// @brief Ensure that the type T is a complete type. 4830/// 4831/// This routine checks whether the type @p T is complete in any 4832/// context where a complete type is required. If @p T is a complete 4833/// type, returns false. If @p T is a class template specialization, 4834/// this routine then attempts to perform class template 4835/// instantiation. If instantiation fails, or if @p T is incomplete 4836/// and cannot be completed, issues the diagnostic @p diag (giving it 4837/// the type @p T) and returns true. 4838/// 4839/// @param Loc The location in the source that the incomplete type 4840/// diagnostic should refer to. 4841/// 4842/// @param T The type that this routine is examining for completeness. 4843/// 4844/// @returns @c true if @p T is incomplete and a diagnostic was emitted, 4845/// @c false otherwise. 4846bool Sema::RequireCompleteType(SourceLocation Loc, QualType T, 4847 TypeDiagnoser &Diagnoser) { 4848 if (RequireCompleteTypeImpl(Loc, T, Diagnoser)) 4849 return true; 4850 if (const TagType *Tag = T->getAs<TagType>()) { 4851 if (!Tag->getDecl()->isCompleteDefinitionRequired()) { 4852 Tag->getDecl()->setCompleteDefinitionRequired(); 4853 Consumer.HandleTagDeclRequiredDefinition(Tag->getDecl()); 4854 } 4855 } 4856 return false; 4857} 4858 4859/// \brief The implementation of RequireCompleteType 4860bool Sema::RequireCompleteTypeImpl(SourceLocation Loc, QualType T, 4861 TypeDiagnoser &Diagnoser) { 4862 // FIXME: Add this assertion to make sure we always get instantiation points. 4863 // assert(!Loc.isInvalid() && "Invalid location in RequireCompleteType"); 4864 // FIXME: Add this assertion to help us flush out problems with 4865 // checking for dependent types and type-dependent expressions. 4866 // 4867 // assert(!T->isDependentType() && 4868 // "Can't ask whether a dependent type is complete"); 4869 4870 // If we have a complete type, we're done. 4871 NamedDecl *Def = 0; 4872 if (!T->isIncompleteType(&Def)) { 4873 // If we know about the definition but it is not visible, complain. 4874 if (!Diagnoser.Suppressed && Def && !LookupResult::isVisible(Def)) { 4875 // Suppress this error outside of a SFINAE context if we've already 4876 // emitted the error once for this type. There's no usefulness in 4877 // repeating the diagnostic. 4878 // FIXME: Add a Fix-It that imports the corresponding module or includes 4879 // the header. 4880 Module *Owner = Def->getOwningModule(); 4881 Diag(Loc, diag::err_module_private_definition) 4882 << T << Owner->getFullModuleName(); 4883 Diag(Def->getLocation(), diag::note_previous_definition); 4884 4885 if (!isSFINAEContext()) { 4886 // Recover by implicitly importing this module. 4887 createImplicitModuleImport(Loc, Owner); 4888 } 4889 } 4890 4891 return false; 4892 } 4893 4894 const TagType *Tag = T->getAs<TagType>(); 4895 const ObjCInterfaceType *IFace = 0; 4896 4897 if (Tag) { 4898 // Avoid diagnosing invalid decls as incomplete. 4899 if (Tag->getDecl()->isInvalidDecl()) 4900 return true; 4901 4902 // Give the external AST source a chance to complete the type. 4903 if (Tag->getDecl()->hasExternalLexicalStorage()) { 4904 Context.getExternalSource()->CompleteType(Tag->getDecl()); 4905 if (!Tag->isIncompleteType()) 4906 return false; 4907 } 4908 } 4909 else if ((IFace = T->getAs<ObjCInterfaceType>())) { 4910 // Avoid diagnosing invalid decls as incomplete. 4911 if (IFace->getDecl()->isInvalidDecl()) 4912 return true; 4913 4914 // Give the external AST source a chance to complete the type. 4915 if (IFace->getDecl()->hasExternalLexicalStorage()) { 4916 Context.getExternalSource()->CompleteType(IFace->getDecl()); 4917 if (!IFace->isIncompleteType()) 4918 return false; 4919 } 4920 } 4921 4922 // If we have a class template specialization or a class member of a 4923 // class template specialization, or an array with known size of such, 4924 // try to instantiate it. 4925 QualType MaybeTemplate = T; 4926 while (const ConstantArrayType *Array 4927 = Context.getAsConstantArrayType(MaybeTemplate)) 4928 MaybeTemplate = Array->getElementType(); 4929 if (const RecordType *Record = MaybeTemplate->getAs<RecordType>()) { 4930 if (ClassTemplateSpecializationDecl *ClassTemplateSpec 4931 = dyn_cast<ClassTemplateSpecializationDecl>(Record->getDecl())) { 4932 if (ClassTemplateSpec->getSpecializationKind() == TSK_Undeclared) 4933 return InstantiateClassTemplateSpecialization(Loc, ClassTemplateSpec, 4934 TSK_ImplicitInstantiation, 4935 /*Complain=*/!Diagnoser.Suppressed); 4936 } else if (CXXRecordDecl *Rec 4937 = dyn_cast<CXXRecordDecl>(Record->getDecl())) { 4938 CXXRecordDecl *Pattern = Rec->getInstantiatedFromMemberClass(); 4939 if (!Rec->isBeingDefined() && Pattern) { 4940 MemberSpecializationInfo *MSI = Rec->getMemberSpecializationInfo(); 4941 assert(MSI && "Missing member specialization information?"); 4942 // This record was instantiated from a class within a template. 4943 if (MSI->getTemplateSpecializationKind() != TSK_ExplicitSpecialization) 4944 return InstantiateClass(Loc, Rec, Pattern, 4945 getTemplateInstantiationArgs(Rec), 4946 TSK_ImplicitInstantiation, 4947 /*Complain=*/!Diagnoser.Suppressed); 4948 } 4949 } 4950 } 4951 4952 if (Diagnoser.Suppressed) 4953 return true; 4954 4955 // We have an incomplete type. Produce a diagnostic. 4956 if (Ident___float128 && 4957 T == Context.getTypeDeclType(Context.getFloat128StubType())) { 4958 Diag(Loc, diag::err_typecheck_decl_incomplete_type___float128); 4959 return true; 4960 } 4961 4962 Diagnoser.diagnose(*this, Loc, T); 4963 4964 // If the type was a forward declaration of a class/struct/union 4965 // type, produce a note. 4966 if (Tag && !Tag->getDecl()->isInvalidDecl()) 4967 Diag(Tag->getDecl()->getLocation(), 4968 Tag->isBeingDefined() ? diag::note_type_being_defined 4969 : diag::note_forward_declaration) 4970 << QualType(Tag, 0); 4971 4972 // If the Objective-C class was a forward declaration, produce a note. 4973 if (IFace && !IFace->getDecl()->isInvalidDecl()) 4974 Diag(IFace->getDecl()->getLocation(), diag::note_forward_class); 4975 4976 return true; 4977} 4978 4979bool Sema::RequireCompleteType(SourceLocation Loc, QualType T, 4980 unsigned DiagID) { 4981 TypeDiagnoserDiag Diagnoser(DiagID); 4982 return RequireCompleteType(Loc, T, Diagnoser); 4983} 4984 4985/// \brief Get diagnostic %select index for tag kind for 4986/// literal type diagnostic message. 4987/// WARNING: Indexes apply to particular diagnostics only! 4988/// 4989/// \returns diagnostic %select index. 4990static unsigned getLiteralDiagFromTagKind(TagTypeKind Tag) { 4991 switch (Tag) { 4992 case TTK_Struct: return 0; 4993 case TTK_Interface: return 1; 4994 case TTK_Class: return 2; 4995 default: llvm_unreachable("Invalid tag kind for literal type diagnostic!"); 4996 } 4997} 4998 4999/// @brief Ensure that the type T is a literal type. 5000/// 5001/// This routine checks whether the type @p T is a literal type. If @p T is an 5002/// incomplete type, an attempt is made to complete it. If @p T is a literal 5003/// type, or @p AllowIncompleteType is true and @p T is an incomplete type, 5004/// returns false. Otherwise, this routine issues the diagnostic @p PD (giving 5005/// it the type @p T), along with notes explaining why the type is not a 5006/// literal type, and returns true. 5007/// 5008/// @param Loc The location in the source that the non-literal type 5009/// diagnostic should refer to. 5010/// 5011/// @param T The type that this routine is examining for literalness. 5012/// 5013/// @param Diagnoser Emits a diagnostic if T is not a literal type. 5014/// 5015/// @returns @c true if @p T is not a literal type and a diagnostic was emitted, 5016/// @c false otherwise. 5017bool Sema::RequireLiteralType(SourceLocation Loc, QualType T, 5018 TypeDiagnoser &Diagnoser) { 5019 assert(!T->isDependentType() && "type should not be dependent"); 5020 5021 QualType ElemType = Context.getBaseElementType(T); 5022 RequireCompleteType(Loc, ElemType, 0); 5023 5024 if (T->isLiteralType(Context)) 5025 return false; 5026 5027 if (Diagnoser.Suppressed) 5028 return true; 5029 5030 Diagnoser.diagnose(*this, Loc, T); 5031 5032 if (T->isVariableArrayType()) 5033 return true; 5034 5035 const RecordType *RT = ElemType->getAs<RecordType>(); 5036 if (!RT) 5037 return true; 5038 5039 const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); 5040 5041 // A partially-defined class type can't be a literal type, because a literal 5042 // class type must have a trivial destructor (which can't be checked until 5043 // the class definition is complete). 5044 if (!RD->isCompleteDefinition()) { 5045 RequireCompleteType(Loc, ElemType, diag::note_non_literal_incomplete, T); 5046 return true; 5047 } 5048 5049 // If the class has virtual base classes, then it's not an aggregate, and 5050 // cannot have any constexpr constructors or a trivial default constructor, 5051 // so is non-literal. This is better to diagnose than the resulting absence 5052 // of constexpr constructors. 5053 if (RD->getNumVBases()) { 5054 Diag(RD->getLocation(), diag::note_non_literal_virtual_base) 5055 << getLiteralDiagFromTagKind(RD->getTagKind()) << RD->getNumVBases(); 5056 for (CXXRecordDecl::base_class_const_iterator I = RD->vbases_begin(), 5057 E = RD->vbases_end(); I != E; ++I) 5058 Diag(I->getLocStart(), 5059 diag::note_constexpr_virtual_base_here) << I->getSourceRange(); 5060 } else if (!RD->isAggregate() && !RD->hasConstexprNonCopyMoveConstructor() && 5061 !RD->hasTrivialDefaultConstructor()) { 5062 Diag(RD->getLocation(), diag::note_non_literal_no_constexpr_ctors) << RD; 5063 } else if (RD->hasNonLiteralTypeFieldsOrBases()) { 5064 for (CXXRecordDecl::base_class_const_iterator I = RD->bases_begin(), 5065 E = RD->bases_end(); I != E; ++I) { 5066 if (!I->getType()->isLiteralType(Context)) { 5067 Diag(I->getLocStart(), 5068 diag::note_non_literal_base_class) 5069 << RD << I->getType() << I->getSourceRange(); 5070 return true; 5071 } 5072 } 5073 for (CXXRecordDecl::field_iterator I = RD->field_begin(), 5074 E = RD->field_end(); I != E; ++I) { 5075 if (!I->getType()->isLiteralType(Context) || 5076 I->getType().isVolatileQualified()) { 5077 Diag(I->getLocation(), diag::note_non_literal_field) 5078 << RD << *I << I->getType() 5079 << I->getType().isVolatileQualified(); 5080 return true; 5081 } 5082 } 5083 } else if (!RD->hasTrivialDestructor()) { 5084 // All fields and bases are of literal types, so have trivial destructors. 5085 // If this class's destructor is non-trivial it must be user-declared. 5086 CXXDestructorDecl *Dtor = RD->getDestructor(); 5087 assert(Dtor && "class has literal fields and bases but no dtor?"); 5088 if (!Dtor) 5089 return true; 5090 5091 Diag(Dtor->getLocation(), Dtor->isUserProvided() ? 5092 diag::note_non_literal_user_provided_dtor : 5093 diag::note_non_literal_nontrivial_dtor) << RD; 5094 if (!Dtor->isUserProvided()) 5095 SpecialMemberIsTrivial(Dtor, CXXDestructor, /*Diagnose*/true); 5096 } 5097 5098 return true; 5099} 5100 5101bool Sema::RequireLiteralType(SourceLocation Loc, QualType T, unsigned DiagID) { 5102 TypeDiagnoserDiag Diagnoser(DiagID); 5103 return RequireLiteralType(Loc, T, Diagnoser); 5104} 5105 5106/// \brief Retrieve a version of the type 'T' that is elaborated by Keyword 5107/// and qualified by the nested-name-specifier contained in SS. 5108QualType Sema::getElaboratedType(ElaboratedTypeKeyword Keyword, 5109 const CXXScopeSpec &SS, QualType T) { 5110 if (T.isNull()) 5111 return T; 5112 NestedNameSpecifier *NNS; 5113 if (SS.isValid()) 5114 NNS = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 5115 else { 5116 if (Keyword == ETK_None) 5117 return T; 5118 NNS = 0; 5119 } 5120 return Context.getElaboratedType(Keyword, NNS, T); 5121} 5122 5123QualType Sema::BuildTypeofExprType(Expr *E, SourceLocation Loc) { 5124 ExprResult ER = CheckPlaceholderExpr(E); 5125 if (ER.isInvalid()) return QualType(); 5126 E = ER.take(); 5127 5128 if (!E->isTypeDependent()) { 5129 QualType T = E->getType(); 5130 if (const TagType *TT = T->getAs<TagType>()) 5131 DiagnoseUseOfDecl(TT->getDecl(), E->getExprLoc()); 5132 } 5133 return Context.getTypeOfExprType(E); 5134} 5135 5136/// getDecltypeForExpr - Given an expr, will return the decltype for 5137/// that expression, according to the rules in C++11 5138/// [dcl.type.simple]p4 and C++11 [expr.lambda.prim]p18. 5139static QualType getDecltypeForExpr(Sema &S, Expr *E) { 5140 if (E->isTypeDependent()) 5141 return S.Context.DependentTy; 5142 5143 // C++11 [dcl.type.simple]p4: 5144 // The type denoted by decltype(e) is defined as follows: 5145 // 5146 // - if e is an unparenthesized id-expression or an unparenthesized class 5147 // member access (5.2.5), decltype(e) is the type of the entity named 5148 // by e. If there is no such entity, or if e names a set of overloaded 5149 // functions, the program is ill-formed; 5150 // 5151 // We apply the same rules for Objective-C ivar and property references. 5152 if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E)) { 5153 if (const ValueDecl *VD = dyn_cast<ValueDecl>(DRE->getDecl())) 5154 return VD->getType(); 5155 } else if (const MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 5156 if (const FieldDecl *FD = dyn_cast<FieldDecl>(ME->getMemberDecl())) 5157 return FD->getType(); 5158 } else if (const ObjCIvarRefExpr *IR = dyn_cast<ObjCIvarRefExpr>(E)) { 5159 return IR->getDecl()->getType(); 5160 } else if (const ObjCPropertyRefExpr *PR = dyn_cast<ObjCPropertyRefExpr>(E)) { 5161 if (PR->isExplicitProperty()) 5162 return PR->getExplicitProperty()->getType(); 5163 } 5164 5165 // C++11 [expr.lambda.prim]p18: 5166 // Every occurrence of decltype((x)) where x is a possibly 5167 // parenthesized id-expression that names an entity of automatic 5168 // storage duration is treated as if x were transformed into an 5169 // access to a corresponding data member of the closure type that 5170 // would have been declared if x were an odr-use of the denoted 5171 // entity. 5172 using namespace sema; 5173 if (S.getCurLambda()) { 5174 if (isa<ParenExpr>(E)) { 5175 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E->IgnoreParens())) { 5176 if (VarDecl *Var = dyn_cast<VarDecl>(DRE->getDecl())) { 5177 QualType T = S.getCapturedDeclRefType(Var, DRE->getLocation()); 5178 if (!T.isNull()) 5179 return S.Context.getLValueReferenceType(T); 5180 } 5181 } 5182 } 5183 } 5184 5185 5186 // C++11 [dcl.type.simple]p4: 5187 // [...] 5188 QualType T = E->getType(); 5189 switch (E->getValueKind()) { 5190 // - otherwise, if e is an xvalue, decltype(e) is T&&, where T is the 5191 // type of e; 5192 case VK_XValue: T = S.Context.getRValueReferenceType(T); break; 5193 // - otherwise, if e is an lvalue, decltype(e) is T&, where T is the 5194 // type of e; 5195 case VK_LValue: T = S.Context.getLValueReferenceType(T); break; 5196 // - otherwise, decltype(e) is the type of e. 5197 case VK_RValue: break; 5198 } 5199 5200 return T; 5201} 5202 5203QualType Sema::BuildDecltypeType(Expr *E, SourceLocation Loc) { 5204 ExprResult ER = CheckPlaceholderExpr(E); 5205 if (ER.isInvalid()) return QualType(); 5206 E = ER.take(); 5207 5208 return Context.getDecltypeType(E, getDecltypeForExpr(*this, E)); 5209} 5210 5211QualType Sema::BuildUnaryTransformType(QualType BaseType, 5212 UnaryTransformType::UTTKind UKind, 5213 SourceLocation Loc) { 5214 switch (UKind) { 5215 case UnaryTransformType::EnumUnderlyingType: 5216 if (!BaseType->isDependentType() && !BaseType->isEnumeralType()) { 5217 Diag(Loc, diag::err_only_enums_have_underlying_types); 5218 return QualType(); 5219 } else { 5220 QualType Underlying = BaseType; 5221 if (!BaseType->isDependentType()) { 5222 EnumDecl *ED = BaseType->getAs<EnumType>()->getDecl(); 5223 assert(ED && "EnumType has no EnumDecl"); 5224 DiagnoseUseOfDecl(ED, Loc); 5225 Underlying = ED->getIntegerType(); 5226 } 5227 assert(!Underlying.isNull()); 5228 return Context.getUnaryTransformType(BaseType, Underlying, 5229 UnaryTransformType::EnumUnderlyingType); 5230 } 5231 } 5232 llvm_unreachable("unknown unary transform type"); 5233} 5234 5235QualType Sema::BuildAtomicType(QualType T, SourceLocation Loc) { 5236 if (!T->isDependentType()) { 5237 // FIXME: It isn't entirely clear whether incomplete atomic types 5238 // are allowed or not; for simplicity, ban them for the moment. 5239 if (RequireCompleteType(Loc, T, diag::err_atomic_specifier_bad_type, 0)) 5240 return QualType(); 5241 5242 int DisallowedKind = -1; 5243 if (T->isArrayType()) 5244 DisallowedKind = 1; 5245 else if (T->isFunctionType()) 5246 DisallowedKind = 2; 5247 else if (T->isReferenceType()) 5248 DisallowedKind = 3; 5249 else if (T->isAtomicType()) 5250 DisallowedKind = 4; 5251 else if (T.hasQualifiers()) 5252 DisallowedKind = 5; 5253 else if (!T.isTriviallyCopyableType(Context)) 5254 // Some other non-trivially-copyable type (probably a C++ class) 5255 DisallowedKind = 6; 5256 5257 if (DisallowedKind != -1) { 5258 Diag(Loc, diag::err_atomic_specifier_bad_type) << DisallowedKind << T; 5259 return QualType(); 5260 } 5261 5262 // FIXME: Do we need any handling for ARC here? 5263 } 5264 5265 // Build the pointer type. 5266 return Context.getAtomicType(T); 5267} 5268