SemaType.cpp revision 2865474261a608c7873b87ba4af110d17907896d
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 "Sema.h" 15#include "clang/AST/ASTContext.h" 16#include "clang/AST/CXXInheritance.h" 17#include "clang/AST/DeclObjC.h" 18#include "clang/AST/DeclTemplate.h" 19#include "clang/AST/TypeLoc.h" 20#include "clang/AST/TypeLocVisitor.h" 21#include "clang/AST/Expr.h" 22#include "clang/Basic/PartialDiagnostic.h" 23#include "clang/Parse/DeclSpec.h" 24#include "llvm/ADT/SmallPtrSet.h" 25#include "llvm/Support/ErrorHandling.h" 26using namespace clang; 27 28#include <iostream> 29 30/// \brief Perform adjustment on the parameter type of a function. 31/// 32/// This routine adjusts the given parameter type @p T to the actual 33/// parameter type used by semantic analysis (C99 6.7.5.3p[7,8], 34/// C++ [dcl.fct]p3). The adjusted parameter type is returned. 35QualType Sema::adjustParameterType(QualType T) { 36 // C99 6.7.5.3p7: 37 // A declaration of a parameter as "array of type" shall be 38 // adjusted to "qualified pointer to type", where the type 39 // qualifiers (if any) are those specified within the [ and ] of 40 // the array type derivation. 41 if (T->isArrayType()) 42 return Context.getArrayDecayedType(T); 43 44 // C99 6.7.5.3p8: 45 // A declaration of a parameter as "function returning type" 46 // shall be adjusted to "pointer to function returning type", as 47 // in 6.3.2.1. 48 if (T->isFunctionType()) 49 return Context.getPointerType(T); 50 51 return T; 52} 53 54 55 56/// isOmittedBlockReturnType - Return true if this declarator is missing a 57/// return type because this is a omitted return type on a block literal. 58static bool isOmittedBlockReturnType(const Declarator &D) { 59 if (D.getContext() != Declarator::BlockLiteralContext || 60 D.getDeclSpec().hasTypeSpecifier()) 61 return false; 62 63 if (D.getNumTypeObjects() == 0) 64 return true; // ^{ ... } 65 66 if (D.getNumTypeObjects() == 1 && 67 D.getTypeObject(0).Kind == DeclaratorChunk::Function) 68 return true; // ^(int X, float Y) { ... } 69 70 return false; 71} 72 73typedef std::pair<const AttributeList*,QualType> DelayedAttribute; 74typedef llvm::SmallVectorImpl<DelayedAttribute> DelayedAttributeSet; 75 76static void ProcessTypeAttributeList(Sema &S, QualType &Type, 77 bool IsDeclSpec, 78 const AttributeList *Attrs, 79 DelayedAttributeSet &DelayedFnAttrs); 80static bool ProcessFnAttr(Sema &S, QualType &Type, const AttributeList &Attr); 81 82static void ProcessDelayedFnAttrs(Sema &S, QualType &Type, 83 DelayedAttributeSet &Attrs) { 84 for (DelayedAttributeSet::iterator I = Attrs.begin(), 85 E = Attrs.end(); I != E; ++I) 86 if (ProcessFnAttr(S, Type, *I->first)) { 87 S.Diag(I->first->getLoc(), diag::warn_function_attribute_wrong_type) 88 << I->first->getName() << I->second; 89 // Avoid any further processing of this attribute. 90 I->first->setInvalid(); 91 } 92 Attrs.clear(); 93} 94 95static void DiagnoseDelayedFnAttrs(Sema &S, DelayedAttributeSet &Attrs) { 96 for (DelayedAttributeSet::iterator I = Attrs.begin(), 97 E = Attrs.end(); I != E; ++I) { 98 S.Diag(I->first->getLoc(), diag::warn_function_attribute_wrong_type) 99 << I->first->getName() << I->second; 100 // Avoid any further processing of this attribute. 101 I->first->setInvalid(); 102 } 103 Attrs.clear(); 104} 105 106/// \brief Convert the specified declspec to the appropriate type 107/// object. 108/// \param D the declarator containing the declaration specifier. 109/// \returns The type described by the declaration specifiers. This function 110/// never returns null. 111static QualType ConvertDeclSpecToType(Sema &TheSema, 112 Declarator &TheDeclarator, 113 DelayedAttributeSet &Delayed) { 114 // FIXME: Should move the logic from DeclSpec::Finish to here for validity 115 // checking. 116 const DeclSpec &DS = TheDeclarator.getDeclSpec(); 117 SourceLocation DeclLoc = TheDeclarator.getIdentifierLoc(); 118 if (DeclLoc.isInvalid()) 119 DeclLoc = DS.getSourceRange().getBegin(); 120 121 ASTContext &Context = TheSema.Context; 122 123 QualType Result; 124 switch (DS.getTypeSpecType()) { 125 case DeclSpec::TST_void: 126 Result = Context.VoidTy; 127 break; 128 case DeclSpec::TST_char: 129 if (DS.getTypeSpecSign() == DeclSpec::TSS_unspecified) 130 Result = Context.CharTy; 131 else if (DS.getTypeSpecSign() == DeclSpec::TSS_signed) 132 Result = Context.SignedCharTy; 133 else { 134 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unsigned && 135 "Unknown TSS value"); 136 Result = Context.UnsignedCharTy; 137 } 138 break; 139 case DeclSpec::TST_wchar: 140 if (DS.getTypeSpecSign() == DeclSpec::TSS_unspecified) 141 Result = Context.WCharTy; 142 else if (DS.getTypeSpecSign() == DeclSpec::TSS_signed) { 143 TheSema.Diag(DS.getTypeSpecSignLoc(), diag::ext_invalid_sign_spec) 144 << DS.getSpecifierName(DS.getTypeSpecType()); 145 Result = Context.getSignedWCharType(); 146 } else { 147 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unsigned && 148 "Unknown TSS value"); 149 TheSema.Diag(DS.getTypeSpecSignLoc(), diag::ext_invalid_sign_spec) 150 << DS.getSpecifierName(DS.getTypeSpecType()); 151 Result = Context.getUnsignedWCharType(); 152 } 153 break; 154 case DeclSpec::TST_char16: 155 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unspecified && 156 "Unknown TSS value"); 157 Result = Context.Char16Ty; 158 break; 159 case DeclSpec::TST_char32: 160 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unspecified && 161 "Unknown TSS value"); 162 Result = Context.Char32Ty; 163 break; 164 case DeclSpec::TST_unspecified: 165 // "<proto1,proto2>" is an objc qualified ID with a missing id. 166 if (DeclSpec::ProtocolQualifierListTy PQ = DS.getProtocolQualifiers()) { 167 Result = Context.getObjCObjectType(Context.ObjCBuiltinIdTy, 168 (ObjCProtocolDecl**)PQ, 169 DS.getNumProtocolQualifiers()); 170 Result = Context.getObjCObjectPointerType(Result); 171 break; 172 } 173 174 // If this is a missing declspec in a block literal return context, then it 175 // is inferred from the return statements inside the block. 176 if (isOmittedBlockReturnType(TheDeclarator)) { 177 Result = Context.DependentTy; 178 break; 179 } 180 181 // Unspecified typespec defaults to int in C90. However, the C90 grammar 182 // [C90 6.5] only allows a decl-spec if there was *some* type-specifier, 183 // type-qualifier, or storage-class-specifier. If not, emit an extwarn. 184 // Note that the one exception to this is function definitions, which are 185 // allowed to be completely missing a declspec. This is handled in the 186 // parser already though by it pretending to have seen an 'int' in this 187 // case. 188 if (TheSema.getLangOptions().ImplicitInt) { 189 // In C89 mode, we only warn if there is a completely missing declspec 190 // when one is not allowed. 191 if (DS.isEmpty()) { 192 TheSema.Diag(DeclLoc, diag::ext_missing_declspec) 193 << DS.getSourceRange() 194 << FixItHint::CreateInsertion(DS.getSourceRange().getBegin(), "int"); 195 } 196 } else if (!DS.hasTypeSpecifier()) { 197 // C99 and C++ require a type specifier. For example, C99 6.7.2p2 says: 198 // "At least one type specifier shall be given in the declaration 199 // specifiers in each declaration, and in the specifier-qualifier list in 200 // each struct declaration and type name." 201 // FIXME: Does Microsoft really have the implicit int extension in C++? 202 if (TheSema.getLangOptions().CPlusPlus && 203 !TheSema.getLangOptions().Microsoft) { 204 TheSema.Diag(DeclLoc, diag::err_missing_type_specifier) 205 << DS.getSourceRange(); 206 207 // When this occurs in C++ code, often something is very broken with the 208 // value being declared, poison it as invalid so we don't get chains of 209 // errors. 210 TheDeclarator.setInvalidType(true); 211 } else { 212 TheSema.Diag(DeclLoc, diag::ext_missing_type_specifier) 213 << DS.getSourceRange(); 214 } 215 } 216 217 // FALL THROUGH. 218 case DeclSpec::TST_int: { 219 if (DS.getTypeSpecSign() != DeclSpec::TSS_unsigned) { 220 switch (DS.getTypeSpecWidth()) { 221 case DeclSpec::TSW_unspecified: Result = Context.IntTy; break; 222 case DeclSpec::TSW_short: Result = Context.ShortTy; break; 223 case DeclSpec::TSW_long: Result = Context.LongTy; break; 224 case DeclSpec::TSW_longlong: 225 Result = Context.LongLongTy; 226 227 // long long is a C99 feature. 228 if (!TheSema.getLangOptions().C99 && 229 !TheSema.getLangOptions().CPlusPlus0x) 230 TheSema.Diag(DS.getTypeSpecWidthLoc(), diag::ext_longlong); 231 break; 232 } 233 } else { 234 switch (DS.getTypeSpecWidth()) { 235 case DeclSpec::TSW_unspecified: Result = Context.UnsignedIntTy; break; 236 case DeclSpec::TSW_short: Result = Context.UnsignedShortTy; break; 237 case DeclSpec::TSW_long: Result = Context.UnsignedLongTy; break; 238 case DeclSpec::TSW_longlong: 239 Result = Context.UnsignedLongLongTy; 240 241 // long long is a C99 feature. 242 if (!TheSema.getLangOptions().C99 && 243 !TheSema.getLangOptions().CPlusPlus0x) 244 TheSema.Diag(DS.getTypeSpecWidthLoc(), diag::ext_longlong); 245 break; 246 } 247 } 248 break; 249 } 250 case DeclSpec::TST_float: Result = Context.FloatTy; break; 251 case DeclSpec::TST_double: 252 if (DS.getTypeSpecWidth() == DeclSpec::TSW_long) 253 Result = Context.LongDoubleTy; 254 else 255 Result = Context.DoubleTy; 256 break; 257 case DeclSpec::TST_bool: Result = Context.BoolTy; break; // _Bool or bool 258 case DeclSpec::TST_decimal32: // _Decimal32 259 case DeclSpec::TST_decimal64: // _Decimal64 260 case DeclSpec::TST_decimal128: // _Decimal128 261 TheSema.Diag(DS.getTypeSpecTypeLoc(), diag::err_decimal_unsupported); 262 Result = Context.IntTy; 263 TheDeclarator.setInvalidType(true); 264 break; 265 case DeclSpec::TST_class: 266 case DeclSpec::TST_enum: 267 case DeclSpec::TST_union: 268 case DeclSpec::TST_struct: { 269 TypeDecl *D 270 = dyn_cast_or_null<TypeDecl>(static_cast<Decl *>(DS.getTypeRep())); 271 if (!D) { 272 // This can happen in C++ with ambiguous lookups. 273 Result = Context.IntTy; 274 TheDeclarator.setInvalidType(true); 275 break; 276 } 277 278 // If the type is deprecated or unavailable, diagnose it. 279 TheSema.DiagnoseUseOfDecl(D, DS.getTypeSpecTypeLoc()); 280 281 assert(DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 && 282 DS.getTypeSpecSign() == 0 && "No qualifiers on tag names!"); 283 284 // TypeQuals handled by caller. 285 Result = Context.getTypeDeclType(D); 286 287 // In C++, make an ElaboratedType. 288 if (TheSema.getLangOptions().CPlusPlus) { 289 ElaboratedTypeKeyword Keyword 290 = ElaboratedType::getKeywordForTypeSpec(DS.getTypeSpecType()); 291 Result = TheSema.getElaboratedType(Keyword, DS.getTypeSpecScope(), 292 Result); 293 } 294 if (D->isInvalidDecl()) 295 TheDeclarator.setInvalidType(true); 296 break; 297 } 298 case DeclSpec::TST_typename: { 299 assert(DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 && 300 DS.getTypeSpecSign() == 0 && 301 "Can't handle qualifiers on typedef names yet!"); 302 Result = TheSema.GetTypeFromParser(DS.getTypeRep()); 303 304 if (DeclSpec::ProtocolQualifierListTy PQ = DS.getProtocolQualifiers()) { 305 if (const ObjCObjectType *ObjT = Result->getAs<ObjCObjectType>()) { 306 // Silently drop any existing protocol qualifiers. 307 // TODO: determine whether that's the right thing to do. 308 if (ObjT->getNumProtocols()) 309 Result = ObjT->getBaseType(); 310 311 if (DS.getNumProtocolQualifiers()) 312 Result = Context.getObjCObjectType(Result, 313 (ObjCProtocolDecl**) PQ, 314 DS.getNumProtocolQualifiers()); 315 } else if (Result->isObjCIdType()) { 316 // id<protocol-list> 317 Result = Context.getObjCObjectType(Context.ObjCBuiltinIdTy, 318 (ObjCProtocolDecl**) PQ, 319 DS.getNumProtocolQualifiers()); 320 Result = Context.getObjCObjectPointerType(Result); 321 } else if (Result->isObjCClassType()) { 322 // Class<protocol-list> 323 Result = Context.getObjCObjectType(Context.ObjCBuiltinClassTy, 324 (ObjCProtocolDecl**) PQ, 325 DS.getNumProtocolQualifiers()); 326 Result = Context.getObjCObjectPointerType(Result); 327 } else { 328 TheSema.Diag(DeclLoc, diag::err_invalid_protocol_qualifiers) 329 << DS.getSourceRange(); 330 TheDeclarator.setInvalidType(true); 331 } 332 } 333 334 // TypeQuals handled by caller. 335 break; 336 } 337 case DeclSpec::TST_typeofType: 338 // FIXME: Preserve type source info. 339 Result = TheSema.GetTypeFromParser(DS.getTypeRep()); 340 assert(!Result.isNull() && "Didn't get a type for typeof?"); 341 // TypeQuals handled by caller. 342 Result = Context.getTypeOfType(Result); 343 break; 344 case DeclSpec::TST_typeofExpr: { 345 Expr *E = static_cast<Expr *>(DS.getTypeRep()); 346 assert(E && "Didn't get an expression for typeof?"); 347 // TypeQuals handled by caller. 348 Result = TheSema.BuildTypeofExprType(E); 349 if (Result.isNull()) { 350 Result = Context.IntTy; 351 TheDeclarator.setInvalidType(true); 352 } 353 break; 354 } 355 case DeclSpec::TST_decltype: { 356 Expr *E = static_cast<Expr *>(DS.getTypeRep()); 357 assert(E && "Didn't get an expression for decltype?"); 358 // TypeQuals handled by caller. 359 Result = TheSema.BuildDecltypeType(E); 360 if (Result.isNull()) { 361 Result = Context.IntTy; 362 TheDeclarator.setInvalidType(true); 363 } 364 break; 365 } 366 case DeclSpec::TST_auto: { 367 // TypeQuals handled by caller. 368 Result = Context.UndeducedAutoTy; 369 break; 370 } 371 372 case DeclSpec::TST_error: 373 Result = Context.IntTy; 374 TheDeclarator.setInvalidType(true); 375 break; 376 } 377 378 // Handle complex types. 379 if (DS.getTypeSpecComplex() == DeclSpec::TSC_complex) { 380 if (TheSema.getLangOptions().Freestanding) 381 TheSema.Diag(DS.getTypeSpecComplexLoc(), diag::ext_freestanding_complex); 382 Result = Context.getComplexType(Result); 383 } else if (DS.isTypeAltiVecVector()) { 384 unsigned typeSize = static_cast<unsigned>(Context.getTypeSize(Result)); 385 assert(typeSize > 0 && "type size for vector must be greater than 0 bits"); 386 Result = Context.getVectorType(Result, 128/typeSize, true, 387 DS.isTypeAltiVecPixel()); 388 } 389 390 assert(DS.getTypeSpecComplex() != DeclSpec::TSC_imaginary && 391 "FIXME: imaginary types not supported yet!"); 392 393 // See if there are any attributes on the declspec that apply to the type (as 394 // opposed to the decl). 395 if (const AttributeList *AL = DS.getAttributes()) 396 ProcessTypeAttributeList(TheSema, Result, true, AL, Delayed); 397 398 // Apply const/volatile/restrict qualifiers to T. 399 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 400 401 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 402 // or incomplete types shall not be restrict-qualified." C++ also allows 403 // restrict-qualified references. 404 if (TypeQuals & DeclSpec::TQ_restrict) { 405 if (Result->isAnyPointerType() || Result->isReferenceType()) { 406 QualType EltTy; 407 if (Result->isObjCObjectPointerType()) 408 EltTy = Result; 409 else 410 EltTy = Result->isPointerType() ? 411 Result->getAs<PointerType>()->getPointeeType() : 412 Result->getAs<ReferenceType>()->getPointeeType(); 413 414 // If we have a pointer or reference, the pointee must have an object 415 // incomplete type. 416 if (!EltTy->isIncompleteOrObjectType()) { 417 TheSema.Diag(DS.getRestrictSpecLoc(), 418 diag::err_typecheck_invalid_restrict_invalid_pointee) 419 << EltTy << DS.getSourceRange(); 420 TypeQuals &= ~DeclSpec::TQ_restrict; // Remove the restrict qualifier. 421 } 422 } else { 423 TheSema.Diag(DS.getRestrictSpecLoc(), 424 diag::err_typecheck_invalid_restrict_not_pointer) 425 << Result << DS.getSourceRange(); 426 TypeQuals &= ~DeclSpec::TQ_restrict; // Remove the restrict qualifier. 427 } 428 } 429 430 // Warn about CV qualifiers on functions: C99 6.7.3p8: "If the specification 431 // of a function type includes any type qualifiers, the behavior is 432 // undefined." 433 if (Result->isFunctionType() && TypeQuals) { 434 // Get some location to point at, either the C or V location. 435 SourceLocation Loc; 436 if (TypeQuals & DeclSpec::TQ_const) 437 Loc = DS.getConstSpecLoc(); 438 else if (TypeQuals & DeclSpec::TQ_volatile) 439 Loc = DS.getVolatileSpecLoc(); 440 else { 441 assert((TypeQuals & DeclSpec::TQ_restrict) && 442 "Has CVR quals but not C, V, or R?"); 443 Loc = DS.getRestrictSpecLoc(); 444 } 445 TheSema.Diag(Loc, diag::warn_typecheck_function_qualifiers) 446 << Result << DS.getSourceRange(); 447 } 448 449 // C++ [dcl.ref]p1: 450 // Cv-qualified references are ill-formed except when the 451 // cv-qualifiers are introduced through the use of a typedef 452 // (7.1.3) or of a template type argument (14.3), in which 453 // case the cv-qualifiers are ignored. 454 // FIXME: Shouldn't we be checking SCS_typedef here? 455 if (DS.getTypeSpecType() == DeclSpec::TST_typename && 456 TypeQuals && Result->isReferenceType()) { 457 TypeQuals &= ~DeclSpec::TQ_const; 458 TypeQuals &= ~DeclSpec::TQ_volatile; 459 } 460 461 Qualifiers Quals = Qualifiers::fromCVRMask(TypeQuals); 462 Result = Context.getQualifiedType(Result, Quals); 463 } 464 465 return Result; 466} 467 468static std::string getPrintableNameForEntity(DeclarationName Entity) { 469 if (Entity) 470 return Entity.getAsString(); 471 472 return "type name"; 473} 474 475QualType Sema::BuildQualifiedType(QualType T, SourceLocation Loc, 476 Qualifiers Qs) { 477 // Enforce C99 6.7.3p2: "Types other than pointer types derived from 478 // object or incomplete types shall not be restrict-qualified." 479 if (Qs.hasRestrict()) { 480 unsigned DiagID = 0; 481 QualType ProblemTy; 482 483 const Type *Ty = T->getCanonicalTypeInternal().getTypePtr(); 484 if (const ReferenceType *RTy = dyn_cast<ReferenceType>(Ty)) { 485 if (!RTy->getPointeeType()->isIncompleteOrObjectType()) { 486 DiagID = diag::err_typecheck_invalid_restrict_invalid_pointee; 487 ProblemTy = T->getAs<ReferenceType>()->getPointeeType(); 488 } 489 } else if (const PointerType *PTy = dyn_cast<PointerType>(Ty)) { 490 if (!PTy->getPointeeType()->isIncompleteOrObjectType()) { 491 DiagID = diag::err_typecheck_invalid_restrict_invalid_pointee; 492 ProblemTy = T->getAs<PointerType>()->getPointeeType(); 493 } 494 } else if (const MemberPointerType *PTy = dyn_cast<MemberPointerType>(Ty)) { 495 if (!PTy->getPointeeType()->isIncompleteOrObjectType()) { 496 DiagID = diag::err_typecheck_invalid_restrict_invalid_pointee; 497 ProblemTy = T->getAs<PointerType>()->getPointeeType(); 498 } 499 } else if (!Ty->isDependentType()) { 500 // FIXME: this deserves a proper diagnostic 501 DiagID = diag::err_typecheck_invalid_restrict_invalid_pointee; 502 ProblemTy = T; 503 } 504 505 if (DiagID) { 506 Diag(Loc, DiagID) << ProblemTy; 507 Qs.removeRestrict(); 508 } 509 } 510 511 return Context.getQualifiedType(T, Qs); 512} 513 514/// \brief Build a pointer type. 515/// 516/// \param T The type to which we'll be building a pointer. 517/// 518/// \param Loc The location of the entity whose type involves this 519/// pointer type or, if there is no such entity, the location of the 520/// type that will have pointer type. 521/// 522/// \param Entity The name of the entity that involves the pointer 523/// type, if known. 524/// 525/// \returns A suitable pointer type, if there are no 526/// errors. Otherwise, returns a NULL type. 527QualType Sema::BuildPointerType(QualType T, 528 SourceLocation Loc, DeclarationName Entity) { 529 if (T->isReferenceType()) { 530 // C++ 8.3.2p4: There shall be no ... pointers to references ... 531 Diag(Loc, diag::err_illegal_decl_pointer_to_reference) 532 << getPrintableNameForEntity(Entity) << T; 533 return QualType(); 534 } 535 536 assert(!T->isObjCObjectType() && "Should build ObjCObjectPointerType"); 537 538 // Build the pointer type. 539 return Context.getPointerType(T); 540} 541 542/// \brief Build a reference type. 543/// 544/// \param T The type to which we'll be building a reference. 545/// 546/// \param Loc The location of the entity whose type involves this 547/// reference type or, if there is no such entity, the location of the 548/// type that will have reference type. 549/// 550/// \param Entity The name of the entity that involves the reference 551/// type, if known. 552/// 553/// \returns A suitable reference type, if there are no 554/// errors. Otherwise, returns a NULL type. 555QualType Sema::BuildReferenceType(QualType T, bool SpelledAsLValue, 556 SourceLocation Loc, 557 DeclarationName Entity) { 558 bool LValueRef = SpelledAsLValue || T->getAs<LValueReferenceType>(); 559 560 // C++0x [dcl.typedef]p9: If a typedef TD names a type that is a 561 // reference to a type T, and attempt to create the type "lvalue 562 // reference to cv TD" creates the type "lvalue reference to T". 563 // We use the qualifiers (restrict or none) of the original reference, 564 // not the new ones. This is consistent with GCC. 565 566 // C++ [dcl.ref]p4: There shall be no references to references. 567 // 568 // According to C++ DR 106, references to references are only 569 // diagnosed when they are written directly (e.g., "int & &"), 570 // but not when they happen via a typedef: 571 // 572 // typedef int& intref; 573 // typedef intref& intref2; 574 // 575 // Parser::ParseDeclaratorInternal diagnoses the case where 576 // references are written directly; here, we handle the 577 // collapsing of references-to-references as described in C++ 578 // DR 106 and amended by C++ DR 540. 579 580 // C++ [dcl.ref]p1: 581 // A declarator that specifies the type "reference to cv void" 582 // is ill-formed. 583 if (T->isVoidType()) { 584 Diag(Loc, diag::err_reference_to_void); 585 return QualType(); 586 } 587 588 // Handle restrict on references. 589 if (LValueRef) 590 return Context.getLValueReferenceType(T, SpelledAsLValue); 591 return Context.getRValueReferenceType(T); 592} 593 594/// \brief Build an array type. 595/// 596/// \param T The type of each element in the array. 597/// 598/// \param ASM C99 array size modifier (e.g., '*', 'static'). 599/// 600/// \param ArraySize Expression describing the size of the array. 601/// 602/// \param Loc The location of the entity whose type involves this 603/// array type or, if there is no such entity, the location of the 604/// type that will have array type. 605/// 606/// \param Entity The name of the entity that involves the array 607/// type, if known. 608/// 609/// \returns A suitable array type, if there are no errors. Otherwise, 610/// returns a NULL type. 611QualType Sema::BuildArrayType(QualType T, ArrayType::ArraySizeModifier ASM, 612 Expr *ArraySize, unsigned Quals, 613 SourceRange Brackets, DeclarationName Entity) { 614 615 SourceLocation Loc = Brackets.getBegin(); 616 if (getLangOptions().CPlusPlus) { 617 // C++ [dcl.array]p1: 618 // T is called the array element type; this type shall not be a reference 619 // type, the (possibly cv-qualified) type void, a function type or an 620 // abstract class type. 621 // 622 // Note: function types are handled in the common path with C. 623 if (T->isReferenceType()) { 624 Diag(Loc, diag::err_illegal_decl_array_of_references) 625 << getPrintableNameForEntity(Entity) << T; 626 return QualType(); 627 } 628 629 if (T->isVoidType()) { 630 Diag(Loc, diag::err_illegal_decl_array_incomplete_type) << T; 631 return QualType(); 632 } 633 634 if (RequireNonAbstractType(Brackets.getBegin(), T, 635 diag::err_array_of_abstract_type)) 636 return QualType(); 637 638 } else { 639 // C99 6.7.5.2p1: If the element type is an incomplete or function type, 640 // reject it (e.g. void ary[7], struct foo ary[7], void ary[7]()) 641 if (RequireCompleteType(Loc, T, 642 diag::err_illegal_decl_array_incomplete_type)) 643 return QualType(); 644 } 645 646 if (T->isFunctionType()) { 647 Diag(Loc, diag::err_illegal_decl_array_of_functions) 648 << getPrintableNameForEntity(Entity) << T; 649 return QualType(); 650 } 651 652 if (Context.getCanonicalType(T) == Context.UndeducedAutoTy) { 653 Diag(Loc, diag::err_illegal_decl_array_of_auto) 654 << getPrintableNameForEntity(Entity); 655 return QualType(); 656 } 657 658 if (const RecordType *EltTy = T->getAs<RecordType>()) { 659 // If the element type is a struct or union that contains a variadic 660 // array, accept it as a GNU extension: C99 6.7.2.1p2. 661 if (EltTy->getDecl()->hasFlexibleArrayMember()) 662 Diag(Loc, diag::ext_flexible_array_in_array) << T; 663 } else if (T->isObjCObjectType()) { 664 Diag(Loc, diag::err_objc_array_of_interfaces) << T; 665 return QualType(); 666 } 667 668 // C99 6.7.5.2p1: The size expression shall have integer type. 669 if (ArraySize && !ArraySize->isTypeDependent() && 670 !ArraySize->getType()->isIntegerType()) { 671 Diag(ArraySize->getLocStart(), diag::err_array_size_non_int) 672 << ArraySize->getType() << ArraySize->getSourceRange(); 673 ArraySize->Destroy(Context); 674 return QualType(); 675 } 676 llvm::APSInt ConstVal(32); 677 if (!ArraySize) { 678 if (ASM == ArrayType::Star) 679 T = Context.getVariableArrayType(T, 0, ASM, Quals, Brackets); 680 else 681 T = Context.getIncompleteArrayType(T, ASM, Quals); 682 } else if (ArraySize->isTypeDependent() || ArraySize->isValueDependent()) { 683 T = Context.getDependentSizedArrayType(T, ArraySize, ASM, Quals, Brackets); 684 } else if (!ArraySize->isIntegerConstantExpr(ConstVal, Context) || 685 (!T->isDependentType() && !T->isIncompleteType() && 686 !T->isConstantSizeType())) { 687 // Per C99, a variable array is an array with either a non-constant 688 // size or an element type that has a non-constant-size 689 T = Context.getVariableArrayType(T, ArraySize, ASM, Quals, Brackets); 690 } else { 691 // C99 6.7.5.2p1: If the expression is a constant expression, it shall 692 // have a value greater than zero. 693 if (ConstVal.isSigned() && ConstVal.isNegative()) { 694 Diag(ArraySize->getLocStart(), 695 diag::err_typecheck_negative_array_size) 696 << ArraySize->getSourceRange(); 697 return QualType(); 698 } 699 if (ConstVal == 0) { 700 // GCC accepts zero sized static arrays. We allow them when 701 // we're not in a SFINAE context. 702 Diag(ArraySize->getLocStart(), 703 isSFINAEContext()? diag::err_typecheck_zero_array_size 704 : diag::ext_typecheck_zero_array_size) 705 << ArraySize->getSourceRange(); 706 } 707 T = Context.getConstantArrayType(T, ConstVal, ASM, Quals); 708 } 709 // If this is not C99, extwarn about VLA's and C99 array size modifiers. 710 if (!getLangOptions().C99) { 711 if (T->isVariableArrayType()) { 712 // Prohibit the use of non-POD types in VLAs. 713 if (!T->isDependentType() && 714 !Context.getBaseElementType(T)->isPODType()) { 715 Diag(Loc, diag::err_vla_non_pod) 716 << Context.getBaseElementType(T); 717 return QualType(); 718 } 719 // Prohibit the use of VLAs during template argument deduction. 720 else if (isSFINAEContext()) { 721 Diag(Loc, diag::err_vla_in_sfinae); 722 return QualType(); 723 } 724 // Just extwarn about VLAs. 725 else 726 Diag(Loc, diag::ext_vla); 727 } else if (ASM != ArrayType::Normal || Quals != 0) 728 Diag(Loc, 729 getLangOptions().CPlusPlus? diag::err_c99_array_usage_cxx 730 : diag::ext_c99_array_usage); 731 } 732 733 return T; 734} 735 736/// \brief Build an ext-vector type. 737/// 738/// Run the required checks for the extended vector type. 739QualType Sema::BuildExtVectorType(QualType T, ExprArg ArraySize, 740 SourceLocation AttrLoc) { 741 742 Expr *Arg = (Expr *)ArraySize.get(); 743 744 // unlike gcc's vector_size attribute, we do not allow vectors to be defined 745 // in conjunction with complex types (pointers, arrays, functions, etc.). 746 if (!T->isDependentType() && 747 !T->isIntegerType() && !T->isRealFloatingType()) { 748 Diag(AttrLoc, diag::err_attribute_invalid_vector_type) << T; 749 return QualType(); 750 } 751 752 if (!Arg->isTypeDependent() && !Arg->isValueDependent()) { 753 llvm::APSInt vecSize(32); 754 if (!Arg->isIntegerConstantExpr(vecSize, Context)) { 755 Diag(AttrLoc, diag::err_attribute_argument_not_int) 756 << "ext_vector_type" << Arg->getSourceRange(); 757 return QualType(); 758 } 759 760 // unlike gcc's vector_size attribute, the size is specified as the 761 // number of elements, not the number of bytes. 762 unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue()); 763 764 if (vectorSize == 0) { 765 Diag(AttrLoc, diag::err_attribute_zero_size) 766 << Arg->getSourceRange(); 767 return QualType(); 768 } 769 770 if (!T->isDependentType()) 771 return Context.getExtVectorType(T, vectorSize); 772 } 773 774 return Context.getDependentSizedExtVectorType(T, ArraySize.takeAs<Expr>(), 775 AttrLoc); 776} 777 778/// \brief Build a function type. 779/// 780/// This routine checks the function type according to C++ rules and 781/// under the assumption that the result type and parameter types have 782/// just been instantiated from a template. It therefore duplicates 783/// some of the behavior of GetTypeForDeclarator, but in a much 784/// simpler form that is only suitable for this narrow use case. 785/// 786/// \param T The return type of the function. 787/// 788/// \param ParamTypes The parameter types of the function. This array 789/// will be modified to account for adjustments to the types of the 790/// function parameters. 791/// 792/// \param NumParamTypes The number of parameter types in ParamTypes. 793/// 794/// \param Variadic Whether this is a variadic function type. 795/// 796/// \param Quals The cvr-qualifiers to be applied to the function type. 797/// 798/// \param Loc The location of the entity whose type involves this 799/// function type or, if there is no such entity, the location of the 800/// type that will have function type. 801/// 802/// \param Entity The name of the entity that involves the function 803/// type, if known. 804/// 805/// \returns A suitable function type, if there are no 806/// errors. Otherwise, returns a NULL type. 807QualType Sema::BuildFunctionType(QualType T, 808 QualType *ParamTypes, 809 unsigned NumParamTypes, 810 bool Variadic, unsigned Quals, 811 SourceLocation Loc, DeclarationName Entity) { 812 if (T->isArrayType() || T->isFunctionType()) { 813 Diag(Loc, diag::err_func_returning_array_function) 814 << T->isFunctionType() << T; 815 return QualType(); 816 } 817 818 bool Invalid = false; 819 for (unsigned Idx = 0; Idx < NumParamTypes; ++Idx) { 820 QualType ParamType = adjustParameterType(ParamTypes[Idx]); 821 if (ParamType->isVoidType()) { 822 Diag(Loc, diag::err_param_with_void_type); 823 Invalid = true; 824 } 825 826 ParamTypes[Idx] = ParamType; 827 } 828 829 if (Invalid) 830 return QualType(); 831 832 return Context.getFunctionType(T, ParamTypes, NumParamTypes, Variadic, 833 Quals, false, false, 0, 0, 834 FunctionType::ExtInfo()); 835} 836 837/// \brief Build a member pointer type \c T Class::*. 838/// 839/// \param T the type to which the member pointer refers. 840/// \param Class the class type into which the member pointer points. 841/// \param CVR Qualifiers applied to the member pointer type 842/// \param Loc the location where this type begins 843/// \param Entity the name of the entity that will have this member pointer type 844/// 845/// \returns a member pointer type, if successful, or a NULL type if there was 846/// an error. 847QualType Sema::BuildMemberPointerType(QualType T, QualType Class, 848 SourceLocation Loc, 849 DeclarationName Entity) { 850 // Verify that we're not building a pointer to pointer to function with 851 // exception specification. 852 if (CheckDistantExceptionSpec(T)) { 853 Diag(Loc, diag::err_distant_exception_spec); 854 855 // FIXME: If we're doing this as part of template instantiation, 856 // we should return immediately. 857 858 // Build the type anyway, but use the canonical type so that the 859 // exception specifiers are stripped off. 860 T = Context.getCanonicalType(T); 861 } 862 863 // C++ 8.3.3p3: A pointer to member shall not pointer to ... a member 864 // with reference type, or "cv void." 865 if (T->isReferenceType()) { 866 Diag(Loc, diag::err_illegal_decl_mempointer_to_reference) 867 << (Entity? Entity.getAsString() : "type name") << T; 868 return QualType(); 869 } 870 871 if (T->isVoidType()) { 872 Diag(Loc, diag::err_illegal_decl_mempointer_to_void) 873 << (Entity? Entity.getAsString() : "type name"); 874 return QualType(); 875 } 876 877 if (!Class->isDependentType() && !Class->isRecordType()) { 878 Diag(Loc, diag::err_mempointer_in_nonclass_type) << Class; 879 return QualType(); 880 } 881 882 return Context.getMemberPointerType(T, Class.getTypePtr()); 883} 884 885/// \brief Build a block pointer type. 886/// 887/// \param T The type to which we'll be building a block pointer. 888/// 889/// \param CVR The cvr-qualifiers to be applied to the block pointer type. 890/// 891/// \param Loc The location of the entity whose type involves this 892/// block pointer type or, if there is no such entity, the location of the 893/// type that will have block pointer type. 894/// 895/// \param Entity The name of the entity that involves the block pointer 896/// type, if known. 897/// 898/// \returns A suitable block pointer type, if there are no 899/// errors. Otherwise, returns a NULL type. 900QualType Sema::BuildBlockPointerType(QualType T, 901 SourceLocation Loc, 902 DeclarationName Entity) { 903 if (!T->isFunctionType()) { 904 Diag(Loc, diag::err_nonfunction_block_type); 905 return QualType(); 906 } 907 908 return Context.getBlockPointerType(T); 909} 910 911QualType Sema::GetTypeFromParser(TypeTy *Ty, TypeSourceInfo **TInfo) { 912 QualType QT = QualType::getFromOpaquePtr(Ty); 913 if (QT.isNull()) { 914 if (TInfo) *TInfo = 0; 915 return QualType(); 916 } 917 918 TypeSourceInfo *DI = 0; 919 if (LocInfoType *LIT = dyn_cast<LocInfoType>(QT)) { 920 QT = LIT->getType(); 921 DI = LIT->getTypeSourceInfo(); 922 } 923 924 if (TInfo) *TInfo = DI; 925 return QT; 926} 927 928/// GetTypeForDeclarator - Convert the type for the specified 929/// declarator to Type instances. 930/// 931/// If OwnedDecl is non-NULL, and this declarator's decl-specifier-seq 932/// owns the declaration of a type (e.g., the definition of a struct 933/// type), then *OwnedDecl will receive the owned declaration. 934/// 935/// The result of this call will never be null, but the associated 936/// type may be a null type if there's an unrecoverable error. 937TypeSourceInfo *Sema::GetTypeForDeclarator(Declarator &D, Scope *S, 938 TagDecl **OwnedDecl) { 939 // Determine the type of the declarator. Not all forms of declarator 940 // have a type. 941 QualType T; 942 TypeSourceInfo *ReturnTypeInfo = 0; 943 944 llvm::SmallVector<DelayedAttribute,4> FnAttrsFromDeclSpec; 945 946 switch (D.getName().getKind()) { 947 case UnqualifiedId::IK_Identifier: 948 case UnqualifiedId::IK_OperatorFunctionId: 949 case UnqualifiedId::IK_LiteralOperatorId: 950 case UnqualifiedId::IK_TemplateId: 951 T = ConvertDeclSpecToType(*this, D, FnAttrsFromDeclSpec); 952 953 if (!D.isInvalidType() && D.getDeclSpec().isTypeSpecOwned()) { 954 TagDecl* Owned = cast<TagDecl>((Decl *)D.getDeclSpec().getTypeRep()); 955 // Owned is embedded if it was defined here, or if it is the 956 // very first (i.e., canonical) declaration of this tag type. 957 Owned->setEmbeddedInDeclarator(Owned->isDefinition() || 958 Owned->isCanonicalDecl()); 959 if (OwnedDecl) *OwnedDecl = Owned; 960 } 961 break; 962 963 case UnqualifiedId::IK_ConstructorName: 964 case UnqualifiedId::IK_ConstructorTemplateId: 965 case UnqualifiedId::IK_DestructorName: 966 // Constructors and destructors don't have return types. Use 967 // "void" instead. 968 T = Context.VoidTy; 969 break; 970 971 case UnqualifiedId::IK_ConversionFunctionId: 972 // The result type of a conversion function is the type that it 973 // converts to. 974 T = GetTypeFromParser(D.getName().ConversionFunctionId, 975 &ReturnTypeInfo); 976 break; 977 } 978 979 if (T.isNull()) 980 return Context.getNullTypeSourceInfo(); 981 982 if (T == Context.UndeducedAutoTy) { 983 int Error = -1; 984 985 switch (D.getContext()) { 986 case Declarator::KNRTypeListContext: 987 assert(0 && "K&R type lists aren't allowed in C++"); 988 break; 989 case Declarator::PrototypeContext: 990 Error = 0; // Function prototype 991 break; 992 case Declarator::MemberContext: 993 switch (cast<TagDecl>(CurContext)->getTagKind()) { 994 case TTK_Enum: assert(0 && "unhandled tag kind"); break; 995 case TTK_Struct: Error = 1; /* Struct member */ break; 996 case TTK_Union: Error = 2; /* Union member */ break; 997 case TTK_Class: Error = 3; /* Class member */ break; 998 } 999 break; 1000 case Declarator::CXXCatchContext: 1001 Error = 4; // Exception declaration 1002 break; 1003 case Declarator::TemplateParamContext: 1004 Error = 5; // Template parameter 1005 break; 1006 case Declarator::BlockLiteralContext: 1007 Error = 6; // Block literal 1008 break; 1009 case Declarator::FileContext: 1010 case Declarator::BlockContext: 1011 case Declarator::ForContext: 1012 case Declarator::ConditionContext: 1013 case Declarator::TypeNameContext: 1014 break; 1015 } 1016 1017 if (Error != -1) { 1018 Diag(D.getDeclSpec().getTypeSpecTypeLoc(), diag::err_auto_not_allowed) 1019 << Error; 1020 T = Context.IntTy; 1021 D.setInvalidType(true); 1022 } 1023 } 1024 1025 // The name we're declaring, if any. 1026 DeclarationName Name; 1027 if (D.getIdentifier()) 1028 Name = D.getIdentifier(); 1029 1030 llvm::SmallVector<DelayedAttribute,4> FnAttrsFromPreviousChunk; 1031 1032 // Walk the DeclTypeInfo, building the recursive type as we go. 1033 // DeclTypeInfos are ordered from the identifier out, which is 1034 // opposite of what we want :). 1035 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 1036 DeclaratorChunk &DeclType = D.getTypeObject(e-i-1); 1037 switch (DeclType.Kind) { 1038 default: assert(0 && "Unknown decltype!"); 1039 case DeclaratorChunk::BlockPointer: 1040 // If blocks are disabled, emit an error. 1041 if (!LangOpts.Blocks) 1042 Diag(DeclType.Loc, diag::err_blocks_disable); 1043 1044 T = BuildBlockPointerType(T, D.getIdentifierLoc(), Name); 1045 if (DeclType.Cls.TypeQuals) 1046 T = BuildQualifiedType(T, DeclType.Loc, DeclType.Cls.TypeQuals); 1047 break; 1048 case DeclaratorChunk::Pointer: 1049 // Verify that we're not building a pointer to pointer to function with 1050 // exception specification. 1051 if (getLangOptions().CPlusPlus && CheckDistantExceptionSpec(T)) { 1052 Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 1053 D.setInvalidType(true); 1054 // Build the type anyway. 1055 } 1056 if (getLangOptions().ObjC1 && T->getAs<ObjCObjectType>()) { 1057 T = Context.getObjCObjectPointerType(T); 1058 if (DeclType.Ptr.TypeQuals) 1059 T = BuildQualifiedType(T, DeclType.Loc, DeclType.Ptr.TypeQuals); 1060 break; 1061 } 1062 T = BuildPointerType(T, DeclType.Loc, Name); 1063 if (DeclType.Ptr.TypeQuals) 1064 T = BuildQualifiedType(T, DeclType.Loc, DeclType.Ptr.TypeQuals); 1065 break; 1066 case DeclaratorChunk::Reference: { 1067 // Verify that we're not building a reference to pointer to function with 1068 // exception specification. 1069 if (getLangOptions().CPlusPlus && CheckDistantExceptionSpec(T)) { 1070 Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 1071 D.setInvalidType(true); 1072 // Build the type anyway. 1073 } 1074 T = BuildReferenceType(T, DeclType.Ref.LValueRef, DeclType.Loc, Name); 1075 1076 Qualifiers Quals; 1077 if (DeclType.Ref.HasRestrict) 1078 T = BuildQualifiedType(T, DeclType.Loc, Qualifiers::Restrict); 1079 break; 1080 } 1081 case DeclaratorChunk::Array: { 1082 // Verify that we're not building an array of pointers to function with 1083 // exception specification. 1084 if (getLangOptions().CPlusPlus && CheckDistantExceptionSpec(T)) { 1085 Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 1086 D.setInvalidType(true); 1087 // Build the type anyway. 1088 } 1089 DeclaratorChunk::ArrayTypeInfo &ATI = DeclType.Arr; 1090 Expr *ArraySize = static_cast<Expr*>(ATI.NumElts); 1091 ArrayType::ArraySizeModifier ASM; 1092 if (ATI.isStar) 1093 ASM = ArrayType::Star; 1094 else if (ATI.hasStatic) 1095 ASM = ArrayType::Static; 1096 else 1097 ASM = ArrayType::Normal; 1098 if (ASM == ArrayType::Star && 1099 D.getContext() != Declarator::PrototypeContext) { 1100 // FIXME: This check isn't quite right: it allows star in prototypes 1101 // for function definitions, and disallows some edge cases detailed 1102 // in http://gcc.gnu.org/ml/gcc-patches/2009-02/msg00133.html 1103 Diag(DeclType.Loc, diag::err_array_star_outside_prototype); 1104 ASM = ArrayType::Normal; 1105 D.setInvalidType(true); 1106 } 1107 T = BuildArrayType(T, ASM, ArraySize, 1108 Qualifiers::fromCVRMask(ATI.TypeQuals), 1109 SourceRange(DeclType.Loc, DeclType.EndLoc), Name); 1110 break; 1111 } 1112 case DeclaratorChunk::Function: { 1113 // If the function declarator has a prototype (i.e. it is not () and 1114 // does not have a K&R-style identifier list), then the arguments are part 1115 // of the type, otherwise the argument list is (). 1116 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun; 1117 1118 // C99 6.7.5.3p1: The return type may not be a function or array type. 1119 // For conversion functions, we'll diagnose this particular error later. 1120 if ((T->isArrayType() || T->isFunctionType()) && 1121 (D.getName().getKind() != UnqualifiedId::IK_ConversionFunctionId)) { 1122 Diag(DeclType.Loc, diag::err_func_returning_array_function) 1123 << T->isFunctionType() << T; 1124 T = Context.IntTy; 1125 D.setInvalidType(true); 1126 } 1127 1128 if (getLangOptions().CPlusPlus && D.getDeclSpec().isTypeSpecOwned()) { 1129 // C++ [dcl.fct]p6: 1130 // Types shall not be defined in return or parameter types. 1131 TagDecl *Tag = cast<TagDecl>((Decl *)D.getDeclSpec().getTypeRep()); 1132 if (Tag->isDefinition()) 1133 Diag(Tag->getLocation(), diag::err_type_defined_in_result_type) 1134 << Context.getTypeDeclType(Tag); 1135 } 1136 1137 // Exception specs are not allowed in typedefs. Complain, but add it 1138 // anyway. 1139 if (FTI.hasExceptionSpec && 1140 D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 1141 Diag(FTI.getThrowLoc(), diag::err_exception_spec_in_typedef); 1142 1143 if (!FTI.NumArgs && !FTI.isVariadic && !getLangOptions().CPlusPlus) { 1144 // Simple void foo(), where the incoming T is the result type. 1145 T = Context.getFunctionNoProtoType(T); 1146 } else { 1147 // We allow a zero-parameter variadic function in C if the 1148 // function is marked with the "overloadable" attribute. Scan 1149 // for this attribute now. 1150 if (!FTI.NumArgs && FTI.isVariadic && !getLangOptions().CPlusPlus) { 1151 bool Overloadable = false; 1152 for (const AttributeList *Attrs = D.getAttributes(); 1153 Attrs; Attrs = Attrs->getNext()) { 1154 if (Attrs->getKind() == AttributeList::AT_overloadable) { 1155 Overloadable = true; 1156 break; 1157 } 1158 } 1159 1160 if (!Overloadable) 1161 Diag(FTI.getEllipsisLoc(), diag::err_ellipsis_first_arg); 1162 } 1163 1164 if (FTI.NumArgs && FTI.ArgInfo[0].Param == 0) { 1165 // C99 6.7.5.3p3: Reject int(x,y,z) when it's not a function definition. 1166 Diag(FTI.ArgInfo[0].IdentLoc, diag::err_ident_list_in_fn_declaration); 1167 D.setInvalidType(true); 1168 break; 1169 } 1170 1171 // Otherwise, we have a function with an argument list that is 1172 // potentially variadic. 1173 llvm::SmallVector<QualType, 16> ArgTys; 1174 ArgTys.reserve(FTI.NumArgs); 1175 1176 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 1177 ParmVarDecl *Param = 1178 cast<ParmVarDecl>(FTI.ArgInfo[i].Param.getAs<Decl>()); 1179 QualType ArgTy = Param->getType(); 1180 assert(!ArgTy.isNull() && "Couldn't parse type?"); 1181 1182 // Adjust the parameter type. 1183 assert((ArgTy == adjustParameterType(ArgTy)) && "Unadjusted type?"); 1184 1185 // Look for 'void'. void is allowed only as a single argument to a 1186 // function with no other parameters (C99 6.7.5.3p10). We record 1187 // int(void) as a FunctionProtoType with an empty argument list. 1188 if (ArgTy->isVoidType()) { 1189 // If this is something like 'float(int, void)', reject it. 'void' 1190 // is an incomplete type (C99 6.2.5p19) and function decls cannot 1191 // have arguments of incomplete type. 1192 if (FTI.NumArgs != 1 || FTI.isVariadic) { 1193 Diag(DeclType.Loc, diag::err_void_only_param); 1194 ArgTy = Context.IntTy; 1195 Param->setType(ArgTy); 1196 } else if (FTI.ArgInfo[i].Ident) { 1197 // Reject, but continue to parse 'int(void abc)'. 1198 Diag(FTI.ArgInfo[i].IdentLoc, 1199 diag::err_param_with_void_type); 1200 ArgTy = Context.IntTy; 1201 Param->setType(ArgTy); 1202 } else { 1203 // Reject, but continue to parse 'float(const void)'. 1204 if (ArgTy.hasQualifiers()) 1205 Diag(DeclType.Loc, diag::err_void_param_qualified); 1206 1207 // Do not add 'void' to the ArgTys list. 1208 break; 1209 } 1210 } else if (!FTI.hasPrototype) { 1211 if (ArgTy->isPromotableIntegerType()) { 1212 ArgTy = Context.getPromotedIntegerType(ArgTy); 1213 } else if (const BuiltinType* BTy = ArgTy->getAs<BuiltinType>()) { 1214 if (BTy->getKind() == BuiltinType::Float) 1215 ArgTy = Context.DoubleTy; 1216 } 1217 } 1218 1219 ArgTys.push_back(ArgTy); 1220 } 1221 1222 llvm::SmallVector<QualType, 4> Exceptions; 1223 Exceptions.reserve(FTI.NumExceptions); 1224 for (unsigned ei = 0, ee = FTI.NumExceptions; ei != ee; ++ei) { 1225 // FIXME: Preserve type source info. 1226 QualType ET = GetTypeFromParser(FTI.Exceptions[ei].Ty); 1227 // Check that the type is valid for an exception spec, and drop it if 1228 // not. 1229 if (!CheckSpecifiedExceptionType(ET, FTI.Exceptions[ei].Range)) 1230 Exceptions.push_back(ET); 1231 } 1232 1233 T = Context.getFunctionType(T, ArgTys.data(), ArgTys.size(), 1234 FTI.isVariadic, FTI.TypeQuals, 1235 FTI.hasExceptionSpec, 1236 FTI.hasAnyExceptionSpec, 1237 Exceptions.size(), Exceptions.data(), 1238 FunctionType::ExtInfo()); 1239 } 1240 1241 // For GCC compatibility, we allow attributes that apply only to 1242 // function types to be placed on a function's return type 1243 // instead (as long as that type doesn't happen to be function 1244 // or function-pointer itself). 1245 ProcessDelayedFnAttrs(*this, T, FnAttrsFromPreviousChunk); 1246 1247 break; 1248 } 1249 case DeclaratorChunk::MemberPointer: 1250 // The scope spec must refer to a class, or be dependent. 1251 QualType ClsType; 1252 if (DeclType.Mem.Scope().isInvalid()) { 1253 // Avoid emitting extra errors if we already errored on the scope. 1254 D.setInvalidType(true); 1255 } else if (isDependentScopeSpecifier(DeclType.Mem.Scope()) 1256 || dyn_cast_or_null<CXXRecordDecl>( 1257 computeDeclContext(DeclType.Mem.Scope()))) { 1258 NestedNameSpecifier *NNS 1259 = (NestedNameSpecifier *)DeclType.Mem.Scope().getScopeRep(); 1260 NestedNameSpecifier *NNSPrefix = NNS->getPrefix(); 1261 switch (NNS->getKind()) { 1262 case NestedNameSpecifier::Identifier: 1263 ClsType = Context.getDependentNameType(ETK_None, NNSPrefix, 1264 NNS->getAsIdentifier()); 1265 break; 1266 1267 case NestedNameSpecifier::Namespace: 1268 case NestedNameSpecifier::Global: 1269 llvm_unreachable("Nested-name-specifier must name a type"); 1270 break; 1271 1272 case NestedNameSpecifier::TypeSpec: 1273 case NestedNameSpecifier::TypeSpecWithTemplate: 1274 ClsType = QualType(NNS->getAsType(), 0); 1275 if (NNSPrefix) 1276 ClsType = Context.getElaboratedType(ETK_None, NNSPrefix, ClsType); 1277 break; 1278 } 1279 } else { 1280 Diag(DeclType.Mem.Scope().getBeginLoc(), 1281 diag::err_illegal_decl_mempointer_in_nonclass) 1282 << (D.getIdentifier() ? D.getIdentifier()->getName() : "type name") 1283 << DeclType.Mem.Scope().getRange(); 1284 D.setInvalidType(true); 1285 } 1286 1287 if (!ClsType.isNull()) 1288 T = BuildMemberPointerType(T, ClsType, DeclType.Loc, D.getIdentifier()); 1289 if (T.isNull()) { 1290 T = Context.IntTy; 1291 D.setInvalidType(true); 1292 } else if (DeclType.Mem.TypeQuals) { 1293 T = BuildQualifiedType(T, DeclType.Loc, DeclType.Mem.TypeQuals); 1294 } 1295 break; 1296 } 1297 1298 if (T.isNull()) { 1299 D.setInvalidType(true); 1300 T = Context.IntTy; 1301 } 1302 1303 DiagnoseDelayedFnAttrs(*this, FnAttrsFromPreviousChunk); 1304 1305 // See if there are any attributes on this declarator chunk. 1306 if (const AttributeList *AL = DeclType.getAttrs()) 1307 ProcessTypeAttributeList(*this, T, false, AL, FnAttrsFromPreviousChunk); 1308 } 1309 1310 if (getLangOptions().CPlusPlus && T->isFunctionType()) { 1311 const FunctionProtoType *FnTy = T->getAs<FunctionProtoType>(); 1312 assert(FnTy && "Why oh why is there not a FunctionProtoType here?"); 1313 1314 // C++ 8.3.5p4: A cv-qualifier-seq shall only be part of the function type 1315 // for a nonstatic member function, the function type to which a pointer 1316 // to member refers, or the top-level function type of a function typedef 1317 // declaration. 1318 if (FnTy->getTypeQuals() != 0 && 1319 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 1320 ((D.getContext() != Declarator::MemberContext && 1321 (!D.getCXXScopeSpec().isSet() || 1322 !computeDeclContext(D.getCXXScopeSpec(), /*FIXME:*/true) 1323 ->isRecord())) || 1324 D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_static)) { 1325 if (D.isFunctionDeclarator()) 1326 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_function_type); 1327 else 1328 Diag(D.getIdentifierLoc(), 1329 diag::err_invalid_qualified_typedef_function_type_use); 1330 1331 // Strip the cv-quals from the type. 1332 T = Context.getFunctionType(FnTy->getResultType(), FnTy->arg_type_begin(), 1333 FnTy->getNumArgs(), FnTy->isVariadic(), 0, 1334 false, false, 0, 0, FunctionType::ExtInfo()); 1335 } 1336 } 1337 1338 // Process any function attributes we might have delayed from the 1339 // declaration-specifiers. 1340 ProcessDelayedFnAttrs(*this, T, FnAttrsFromDeclSpec); 1341 1342 // If there were any type attributes applied to the decl itself, not 1343 // the type, apply them to the result type. But don't do this for 1344 // block-literal expressions, which are parsed wierdly. 1345 if (D.getContext() != Declarator::BlockLiteralContext) 1346 if (const AttributeList *Attrs = D.getAttributes()) 1347 ProcessTypeAttributeList(*this, T, false, Attrs, 1348 FnAttrsFromPreviousChunk); 1349 1350 DiagnoseDelayedFnAttrs(*this, FnAttrsFromPreviousChunk); 1351 1352 if (T.isNull()) 1353 return Context.getNullTypeSourceInfo(); 1354 else if (D.isInvalidType()) 1355 return Context.getTrivialTypeSourceInfo(T); 1356 return GetTypeSourceInfoForDeclarator(D, T, ReturnTypeInfo); 1357} 1358 1359namespace { 1360 class TypeSpecLocFiller : public TypeLocVisitor<TypeSpecLocFiller> { 1361 const DeclSpec &DS; 1362 1363 public: 1364 TypeSpecLocFiller(const DeclSpec &DS) : DS(DS) {} 1365 1366 void VisitQualifiedTypeLoc(QualifiedTypeLoc TL) { 1367 Visit(TL.getUnqualifiedLoc()); 1368 } 1369 void VisitTypedefTypeLoc(TypedefTypeLoc TL) { 1370 TL.setNameLoc(DS.getTypeSpecTypeLoc()); 1371 } 1372 void VisitObjCInterfaceTypeLoc(ObjCInterfaceTypeLoc TL) { 1373 TL.setNameLoc(DS.getTypeSpecTypeLoc()); 1374 } 1375 void VisitObjCObjectTypeLoc(ObjCObjectTypeLoc TL) { 1376 // Handle the base type, which might not have been written explicitly. 1377 if (DS.getTypeSpecType() == DeclSpec::TST_unspecified) { 1378 TL.setHasBaseTypeAsWritten(false); 1379 TL.getBaseLoc().initialize(SourceLocation()); 1380 } else { 1381 TL.setHasBaseTypeAsWritten(true); 1382 Visit(TL.getBaseLoc()); 1383 } 1384 1385 // Protocol qualifiers. 1386 if (DS.getProtocolQualifiers()) { 1387 assert(TL.getNumProtocols() > 0); 1388 assert(TL.getNumProtocols() == DS.getNumProtocolQualifiers()); 1389 TL.setLAngleLoc(DS.getProtocolLAngleLoc()); 1390 TL.setRAngleLoc(DS.getSourceRange().getEnd()); 1391 for (unsigned i = 0, e = DS.getNumProtocolQualifiers(); i != e; ++i) 1392 TL.setProtocolLoc(i, DS.getProtocolLocs()[i]); 1393 } else { 1394 assert(TL.getNumProtocols() == 0); 1395 TL.setLAngleLoc(SourceLocation()); 1396 TL.setRAngleLoc(SourceLocation()); 1397 } 1398 } 1399 void VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL) { 1400 TL.setStarLoc(SourceLocation()); 1401 Visit(TL.getPointeeLoc()); 1402 } 1403 void VisitTemplateSpecializationTypeLoc(TemplateSpecializationTypeLoc TL) { 1404 TypeSourceInfo *TInfo = 0; 1405 Sema::GetTypeFromParser(DS.getTypeRep(), &TInfo); 1406 1407 // If we got no declarator info from previous Sema routines, 1408 // just fill with the typespec loc. 1409 if (!TInfo) { 1410 TL.initialize(DS.getTypeSpecTypeLoc()); 1411 return; 1412 } 1413 1414 TypeLoc OldTL = TInfo->getTypeLoc(); 1415 if (TInfo->getType()->getAs<ElaboratedType>()) { 1416 ElaboratedTypeLoc ElabTL = cast<ElaboratedTypeLoc>(OldTL); 1417 TemplateSpecializationTypeLoc NamedTL = 1418 cast<TemplateSpecializationTypeLoc>(ElabTL.getNamedTypeLoc()); 1419 TL.copy(NamedTL); 1420 } 1421 else 1422 TL.copy(cast<TemplateSpecializationTypeLoc>(OldTL)); 1423 } 1424 void VisitTypeOfExprTypeLoc(TypeOfExprTypeLoc TL) { 1425 assert(DS.getTypeSpecType() == DeclSpec::TST_typeofExpr); 1426 TL.setTypeofLoc(DS.getTypeSpecTypeLoc()); 1427 TL.setParensRange(DS.getTypeofParensRange()); 1428 } 1429 void VisitTypeOfTypeLoc(TypeOfTypeLoc TL) { 1430 assert(DS.getTypeSpecType() == DeclSpec::TST_typeofType); 1431 TL.setTypeofLoc(DS.getTypeSpecTypeLoc()); 1432 TL.setParensRange(DS.getTypeofParensRange()); 1433 assert(DS.getTypeRep()); 1434 TypeSourceInfo *TInfo = 0; 1435 Sema::GetTypeFromParser(DS.getTypeRep(), &TInfo); 1436 TL.setUnderlyingTInfo(TInfo); 1437 } 1438 void VisitBuiltinTypeLoc(BuiltinTypeLoc TL) { 1439 // By default, use the source location of the type specifier. 1440 TL.setBuiltinLoc(DS.getTypeSpecTypeLoc()); 1441 if (TL.needsExtraLocalData()) { 1442 // Set info for the written builtin specifiers. 1443 TL.getWrittenBuiltinSpecs() = DS.getWrittenBuiltinSpecs(); 1444 // Try to have a meaningful source location. 1445 if (TL.getWrittenSignSpec() != TSS_unspecified) 1446 // Sign spec loc overrides the others (e.g., 'unsigned long'). 1447 TL.setBuiltinLoc(DS.getTypeSpecSignLoc()); 1448 else if (TL.getWrittenWidthSpec() != TSW_unspecified) 1449 // Width spec loc overrides type spec loc (e.g., 'short int'). 1450 TL.setBuiltinLoc(DS.getTypeSpecWidthLoc()); 1451 } 1452 } 1453 void VisitElaboratedTypeLoc(ElaboratedTypeLoc TL) { 1454 ElaboratedTypeKeyword Keyword 1455 = TypeWithKeyword::getKeywordForTypeSpec(DS.getTypeSpecType()); 1456 if (Keyword == ETK_Typename) { 1457 TypeSourceInfo *TInfo = 0; 1458 Sema::GetTypeFromParser(DS.getTypeRep(), &TInfo); 1459 if (TInfo) { 1460 TL.copy(cast<ElaboratedTypeLoc>(TInfo->getTypeLoc())); 1461 return; 1462 } 1463 } 1464 TL.setKeywordLoc(Keyword != ETK_None 1465 ? DS.getTypeSpecTypeLoc() 1466 : SourceLocation()); 1467 const CXXScopeSpec& SS = DS.getTypeSpecScope(); 1468 TL.setQualifierRange(SS.isEmpty() ? SourceRange(): SS.getRange()); 1469 Visit(TL.getNextTypeLoc().getUnqualifiedLoc()); 1470 } 1471 void VisitDependentNameTypeLoc(DependentNameTypeLoc TL) { 1472 ElaboratedTypeKeyword Keyword 1473 = TypeWithKeyword::getKeywordForTypeSpec(DS.getTypeSpecType()); 1474 if (Keyword == ETK_Typename) { 1475 TypeSourceInfo *TInfo = 0; 1476 Sema::GetTypeFromParser(DS.getTypeRep(), &TInfo); 1477 if (TInfo) { 1478 TL.copy(cast<DependentNameTypeLoc>(TInfo->getTypeLoc())); 1479 return; 1480 } 1481 } 1482 TL.setKeywordLoc(Keyword != ETK_None 1483 ? DS.getTypeSpecTypeLoc() 1484 : SourceLocation()); 1485 const CXXScopeSpec& SS = DS.getTypeSpecScope(); 1486 TL.setQualifierRange(SS.isEmpty() ? SourceRange() : SS.getRange()); 1487 // FIXME: load appropriate source location. 1488 TL.setNameLoc(DS.getTypeSpecTypeLoc()); 1489 } 1490 1491 void VisitTypeLoc(TypeLoc TL) { 1492 // FIXME: add other typespec types and change this to an assert. 1493 TL.initialize(DS.getTypeSpecTypeLoc()); 1494 } 1495 }; 1496 1497 class DeclaratorLocFiller : public TypeLocVisitor<DeclaratorLocFiller> { 1498 const DeclaratorChunk &Chunk; 1499 1500 public: 1501 DeclaratorLocFiller(const DeclaratorChunk &Chunk) : Chunk(Chunk) {} 1502 1503 void VisitQualifiedTypeLoc(QualifiedTypeLoc TL) { 1504 llvm_unreachable("qualified type locs not expected here!"); 1505 } 1506 1507 void VisitBlockPointerTypeLoc(BlockPointerTypeLoc TL) { 1508 assert(Chunk.Kind == DeclaratorChunk::BlockPointer); 1509 TL.setCaretLoc(Chunk.Loc); 1510 } 1511 void VisitPointerTypeLoc(PointerTypeLoc TL) { 1512 assert(Chunk.Kind == DeclaratorChunk::Pointer); 1513 TL.setStarLoc(Chunk.Loc); 1514 } 1515 void VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL) { 1516 assert(Chunk.Kind == DeclaratorChunk::Pointer); 1517 TL.setStarLoc(Chunk.Loc); 1518 } 1519 void VisitMemberPointerTypeLoc(MemberPointerTypeLoc TL) { 1520 assert(Chunk.Kind == DeclaratorChunk::MemberPointer); 1521 TL.setStarLoc(Chunk.Loc); 1522 // FIXME: nested name specifier 1523 } 1524 void VisitLValueReferenceTypeLoc(LValueReferenceTypeLoc TL) { 1525 assert(Chunk.Kind == DeclaratorChunk::Reference); 1526 // 'Amp' is misleading: this might have been originally 1527 /// spelled with AmpAmp. 1528 TL.setAmpLoc(Chunk.Loc); 1529 } 1530 void VisitRValueReferenceTypeLoc(RValueReferenceTypeLoc TL) { 1531 assert(Chunk.Kind == DeclaratorChunk::Reference); 1532 assert(!Chunk.Ref.LValueRef); 1533 TL.setAmpAmpLoc(Chunk.Loc); 1534 } 1535 void VisitArrayTypeLoc(ArrayTypeLoc TL) { 1536 assert(Chunk.Kind == DeclaratorChunk::Array); 1537 TL.setLBracketLoc(Chunk.Loc); 1538 TL.setRBracketLoc(Chunk.EndLoc); 1539 TL.setSizeExpr(static_cast<Expr*>(Chunk.Arr.NumElts)); 1540 } 1541 void VisitFunctionTypeLoc(FunctionTypeLoc TL) { 1542 assert(Chunk.Kind == DeclaratorChunk::Function); 1543 TL.setLParenLoc(Chunk.Loc); 1544 TL.setRParenLoc(Chunk.EndLoc); 1545 1546 const DeclaratorChunk::FunctionTypeInfo &FTI = Chunk.Fun; 1547 for (unsigned i = 0, e = TL.getNumArgs(), tpi = 0; i != e; ++i) { 1548 ParmVarDecl *Param = FTI.ArgInfo[i].Param.getAs<ParmVarDecl>(); 1549 TL.setArg(tpi++, Param); 1550 } 1551 // FIXME: exception specs 1552 } 1553 1554 void VisitTypeLoc(TypeLoc TL) { 1555 llvm_unreachable("unsupported TypeLoc kind in declarator!"); 1556 } 1557 }; 1558} 1559 1560/// \brief Create and instantiate a TypeSourceInfo with type source information. 1561/// 1562/// \param T QualType referring to the type as written in source code. 1563/// 1564/// \param ReturnTypeInfo For declarators whose return type does not show 1565/// up in the normal place in the declaration specifiers (such as a C++ 1566/// conversion function), this pointer will refer to a type source information 1567/// for that return type. 1568TypeSourceInfo * 1569Sema::GetTypeSourceInfoForDeclarator(Declarator &D, QualType T, 1570 TypeSourceInfo *ReturnTypeInfo) { 1571 TypeSourceInfo *TInfo = Context.CreateTypeSourceInfo(T); 1572 UnqualTypeLoc CurrTL = TInfo->getTypeLoc().getUnqualifiedLoc(); 1573 1574 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 1575 DeclaratorLocFiller(D.getTypeObject(i)).Visit(CurrTL); 1576 CurrTL = CurrTL.getNextTypeLoc().getUnqualifiedLoc(); 1577 } 1578 1579 TypeSpecLocFiller(D.getDeclSpec()).Visit(CurrTL); 1580 1581 // We have source information for the return type that was not in the 1582 // declaration specifiers; copy that information into the current type 1583 // location so that it will be retained. This occurs, for example, with 1584 // a C++ conversion function, where the return type occurs within the 1585 // declarator-id rather than in the declaration specifiers. 1586 if (ReturnTypeInfo && D.getDeclSpec().getTypeSpecType() == TST_unspecified) { 1587 TypeLoc TL = ReturnTypeInfo->getTypeLoc(); 1588 assert(TL.getFullDataSize() == CurrTL.getFullDataSize()); 1589 memcpy(CurrTL.getOpaqueData(), TL.getOpaqueData(), TL.getFullDataSize()); 1590 } 1591 1592 return TInfo; 1593} 1594 1595/// \brief Create a LocInfoType to hold the given QualType and TypeSourceInfo. 1596QualType Sema::CreateLocInfoType(QualType T, TypeSourceInfo *TInfo) { 1597 // FIXME: LocInfoTypes are "transient", only needed for passing to/from Parser 1598 // and Sema during declaration parsing. Try deallocating/caching them when 1599 // it's appropriate, instead of allocating them and keeping them around. 1600 LocInfoType *LocT = (LocInfoType*)BumpAlloc.Allocate(sizeof(LocInfoType), 8); 1601 new (LocT) LocInfoType(T, TInfo); 1602 assert(LocT->getTypeClass() != T->getTypeClass() && 1603 "LocInfoType's TypeClass conflicts with an existing Type class"); 1604 return QualType(LocT, 0); 1605} 1606 1607void LocInfoType::getAsStringInternal(std::string &Str, 1608 const PrintingPolicy &Policy) const { 1609 assert(false && "LocInfoType leaked into the type system; an opaque TypeTy*" 1610 " was used directly instead of getting the QualType through" 1611 " GetTypeFromParser"); 1612} 1613 1614/// UnwrapSimilarPointerTypes - If T1 and T2 are pointer types that 1615/// may be similar (C++ 4.4), replaces T1 and T2 with the type that 1616/// they point to and return true. If T1 and T2 aren't pointer types 1617/// or pointer-to-member types, or if they are not similar at this 1618/// level, returns false and leaves T1 and T2 unchanged. Top-level 1619/// qualifiers on T1 and T2 are ignored. This function will typically 1620/// be called in a loop that successively "unwraps" pointer and 1621/// pointer-to-member types to compare them at each level. 1622bool Sema::UnwrapSimilarPointerTypes(QualType& T1, QualType& T2) { 1623 const PointerType *T1PtrType = T1->getAs<PointerType>(), 1624 *T2PtrType = T2->getAs<PointerType>(); 1625 if (T1PtrType && T2PtrType) { 1626 T1 = T1PtrType->getPointeeType(); 1627 T2 = T2PtrType->getPointeeType(); 1628 return true; 1629 } 1630 1631 const MemberPointerType *T1MPType = T1->getAs<MemberPointerType>(), 1632 *T2MPType = T2->getAs<MemberPointerType>(); 1633 if (T1MPType && T2MPType && 1634 Context.getCanonicalType(T1MPType->getClass()) == 1635 Context.getCanonicalType(T2MPType->getClass())) { 1636 T1 = T1MPType->getPointeeType(); 1637 T2 = T2MPType->getPointeeType(); 1638 return true; 1639 } 1640 1641 if (getLangOptions().ObjC1) { 1642 const ObjCObjectPointerType *T1OPType = T1->getAs<ObjCObjectPointerType>(), 1643 *T2OPType = T2->getAs<ObjCObjectPointerType>(); 1644 if (T1OPType && T2OPType) { 1645 T1 = T1OPType->getPointeeType(); 1646 T2 = T2OPType->getPointeeType(); 1647 return true; 1648 } 1649 } 1650 return false; 1651} 1652 1653Sema::TypeResult Sema::ActOnTypeName(Scope *S, Declarator &D) { 1654 // C99 6.7.6: Type names have no identifier. This is already validated by 1655 // the parser. 1656 assert(D.getIdentifier() == 0 && "Type name should have no identifier!"); 1657 1658 TagDecl *OwnedTag = 0; 1659 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S, &OwnedTag); 1660 QualType T = TInfo->getType(); 1661 if (D.isInvalidType()) 1662 return true; 1663 1664 if (getLangOptions().CPlusPlus) { 1665 // Check that there are no default arguments (C++ only). 1666 CheckExtraCXXDefaultArguments(D); 1667 1668 // C++0x [dcl.type]p3: 1669 // A type-specifier-seq shall not define a class or enumeration 1670 // unless it appears in the type-id of an alias-declaration 1671 // (7.1.3). 1672 if (OwnedTag && OwnedTag->isDefinition()) 1673 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_type_specifier) 1674 << Context.getTypeDeclType(OwnedTag); 1675 } 1676 1677 T = CreateLocInfoType(T, TInfo); 1678 return T.getAsOpaquePtr(); 1679} 1680 1681 1682 1683//===----------------------------------------------------------------------===// 1684// Type Attribute Processing 1685//===----------------------------------------------------------------------===// 1686 1687/// HandleAddressSpaceTypeAttribute - Process an address_space attribute on the 1688/// specified type. The attribute contains 1 argument, the id of the address 1689/// space for the type. 1690static void HandleAddressSpaceTypeAttribute(QualType &Type, 1691 const AttributeList &Attr, Sema &S){ 1692 1693 // If this type is already address space qualified, reject it. 1694 // Clause 6.7.3 - Type qualifiers: "No type shall be qualified by qualifiers 1695 // for two or more different address spaces." 1696 if (Type.getAddressSpace()) { 1697 S.Diag(Attr.getLoc(), diag::err_attribute_address_multiple_qualifiers); 1698 Attr.setInvalid(); 1699 return; 1700 } 1701 1702 // Check the attribute arguments. 1703 if (Attr.getNumArgs() != 1) { 1704 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 1705 Attr.setInvalid(); 1706 return; 1707 } 1708 Expr *ASArgExpr = static_cast<Expr *>(Attr.getArg(0)); 1709 llvm::APSInt addrSpace(32); 1710 if (ASArgExpr->isTypeDependent() || ASArgExpr->isValueDependent() || 1711 !ASArgExpr->isIntegerConstantExpr(addrSpace, S.Context)) { 1712 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_not_int) 1713 << ASArgExpr->getSourceRange(); 1714 Attr.setInvalid(); 1715 return; 1716 } 1717 1718 // Bounds checking. 1719 if (addrSpace.isSigned()) { 1720 if (addrSpace.isNegative()) { 1721 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_negative) 1722 << ASArgExpr->getSourceRange(); 1723 Attr.setInvalid(); 1724 return; 1725 } 1726 addrSpace.setIsSigned(false); 1727 } 1728 llvm::APSInt max(addrSpace.getBitWidth()); 1729 max = Qualifiers::MaxAddressSpace; 1730 if (addrSpace > max) { 1731 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_too_high) 1732 << Qualifiers::MaxAddressSpace << ASArgExpr->getSourceRange(); 1733 Attr.setInvalid(); 1734 return; 1735 } 1736 1737 unsigned ASIdx = static_cast<unsigned>(addrSpace.getZExtValue()); 1738 Type = S.Context.getAddrSpaceQualType(Type, ASIdx); 1739} 1740 1741/// HandleObjCGCTypeAttribute - Process an objc's gc attribute on the 1742/// specified type. The attribute contains 1 argument, weak or strong. 1743static void HandleObjCGCTypeAttribute(QualType &Type, 1744 const AttributeList &Attr, Sema &S) { 1745 if (Type.getObjCGCAttr() != Qualifiers::GCNone) { 1746 S.Diag(Attr.getLoc(), diag::err_attribute_multiple_objc_gc); 1747 Attr.setInvalid(); 1748 return; 1749 } 1750 1751 // Check the attribute arguments. 1752 if (!Attr.getParameterName()) { 1753 S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_string) 1754 << "objc_gc" << 1; 1755 Attr.setInvalid(); 1756 return; 1757 } 1758 Qualifiers::GC GCAttr; 1759 if (Attr.getNumArgs() != 0) { 1760 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 1761 Attr.setInvalid(); 1762 return; 1763 } 1764 if (Attr.getParameterName()->isStr("weak")) 1765 GCAttr = Qualifiers::Weak; 1766 else if (Attr.getParameterName()->isStr("strong")) 1767 GCAttr = Qualifiers::Strong; 1768 else { 1769 S.Diag(Attr.getLoc(), diag::warn_attribute_type_not_supported) 1770 << "objc_gc" << Attr.getParameterName(); 1771 Attr.setInvalid(); 1772 return; 1773 } 1774 1775 Type = S.Context.getObjCGCQualType(Type, GCAttr); 1776} 1777 1778/// Process an individual function attribute. Returns true if the 1779/// attribute does not make sense to apply to this type. 1780bool ProcessFnAttr(Sema &S, QualType &Type, const AttributeList &Attr) { 1781 if (Attr.getKind() == AttributeList::AT_noreturn) { 1782 // Complain immediately if the arg count is wrong. 1783 if (Attr.getNumArgs() != 0) { 1784 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0; 1785 Attr.setInvalid(); 1786 return false; 1787 } 1788 1789 // Delay if this is not a function or pointer to block. 1790 if (!Type->isFunctionPointerType() 1791 && !Type->isBlockPointerType() 1792 && !Type->isFunctionType()) 1793 return true; 1794 1795 // Otherwise we can process right away. 1796 Type = S.Context.getNoReturnType(Type); 1797 return false; 1798 } 1799 1800 if (Attr.getKind() == AttributeList::AT_regparm) { 1801 // The warning is emitted elsewhere 1802 if (Attr.getNumArgs() != 1) { 1803 return false; 1804 } 1805 1806 // Delay if this is not a function or pointer to block. 1807 if (!Type->isFunctionPointerType() 1808 && !Type->isBlockPointerType() 1809 && !Type->isFunctionType()) 1810 return true; 1811 1812 // Otherwise we can process right away. 1813 Expr *NumParamsExpr = static_cast<Expr *>(Attr.getArg(0)); 1814 llvm::APSInt NumParams(32); 1815 1816 // The warning is emitted elsewhere 1817 if (NumParamsExpr->isTypeDependent() || NumParamsExpr->isValueDependent() || 1818 !NumParamsExpr->isIntegerConstantExpr(NumParams, S.Context)) 1819 return false; 1820 1821 Type = S.Context.getRegParmType(Type, NumParams.getZExtValue()); 1822 return false; 1823 } 1824 1825 // Otherwise, a calling convention. 1826 if (Attr.getNumArgs() != 0) { 1827 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0; 1828 Attr.setInvalid(); 1829 return false; 1830 } 1831 1832 QualType T = Type; 1833 if (const PointerType *PT = Type->getAs<PointerType>()) 1834 T = PT->getPointeeType(); 1835 const FunctionType *Fn = T->getAs<FunctionType>(); 1836 1837 // Delay if the type didn't work out to a function. 1838 if (!Fn) return true; 1839 1840 // TODO: diagnose uses of these conventions on the wrong target. 1841 CallingConv CC; 1842 switch (Attr.getKind()) { 1843 case AttributeList::AT_cdecl: CC = CC_C; break; 1844 case AttributeList::AT_fastcall: CC = CC_X86FastCall; break; 1845 case AttributeList::AT_stdcall: CC = CC_X86StdCall; break; 1846 case AttributeList::AT_thiscall: CC = CC_X86ThisCall; break; 1847 default: llvm_unreachable("unexpected attribute kind"); return false; 1848 } 1849 1850 CallingConv CCOld = Fn->getCallConv(); 1851 if (S.Context.getCanonicalCallConv(CC) == 1852 S.Context.getCanonicalCallConv(CCOld)) { 1853 Attr.setInvalid(); 1854 return false; 1855 } 1856 1857 if (CCOld != CC_Default) { 1858 // Should we diagnose reapplications of the same convention? 1859 S.Diag(Attr.getLoc(), diag::err_attributes_are_not_compatible) 1860 << FunctionType::getNameForCallConv(CC) 1861 << FunctionType::getNameForCallConv(CCOld); 1862 Attr.setInvalid(); 1863 return false; 1864 } 1865 1866 // Diagnose the use of X86 fastcall on varargs or unprototyped functions. 1867 if (CC == CC_X86FastCall) { 1868 if (isa<FunctionNoProtoType>(Fn)) { 1869 S.Diag(Attr.getLoc(), diag::err_cconv_knr) 1870 << FunctionType::getNameForCallConv(CC); 1871 Attr.setInvalid(); 1872 return false; 1873 } 1874 1875 const FunctionProtoType *FnP = cast<FunctionProtoType>(Fn); 1876 if (FnP->isVariadic()) { 1877 S.Diag(Attr.getLoc(), diag::err_cconv_varargs) 1878 << FunctionType::getNameForCallConv(CC); 1879 Attr.setInvalid(); 1880 return false; 1881 } 1882 } 1883 1884 Type = S.Context.getCallConvType(Type, CC); 1885 return false; 1886} 1887 1888/// HandleVectorSizeAttribute - this attribute is only applicable to integral 1889/// and float scalars, although arrays, pointers, and function return values are 1890/// allowed in conjunction with this construct. Aggregates with this attribute 1891/// are invalid, even if they are of the same size as a corresponding scalar. 1892/// The raw attribute should contain precisely 1 argument, the vector size for 1893/// the variable, measured in bytes. If curType and rawAttr are well formed, 1894/// this routine will return a new vector type. 1895static void HandleVectorSizeAttr(QualType& CurType, const AttributeList &Attr, Sema &S) { 1896 // Check the attribute arugments. 1897 if (Attr.getNumArgs() != 1) { 1898 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 1899 Attr.setInvalid(); 1900 return; 1901 } 1902 Expr *sizeExpr = static_cast<Expr *>(Attr.getArg(0)); 1903 llvm::APSInt vecSize(32); 1904 if (sizeExpr->isTypeDependent() || sizeExpr->isValueDependent() || 1905 !sizeExpr->isIntegerConstantExpr(vecSize, S.Context)) { 1906 S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int) 1907 << "vector_size" << sizeExpr->getSourceRange(); 1908 Attr.setInvalid(); 1909 return; 1910 } 1911 // the base type must be integer or float, and can't already be a vector. 1912 if (CurType->isVectorType() || 1913 (!CurType->isIntegerType() && !CurType->isRealFloatingType())) { 1914 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_vector_type) << CurType; 1915 Attr.setInvalid(); 1916 return; 1917 } 1918 unsigned typeSize = static_cast<unsigned>(S.Context.getTypeSize(CurType)); 1919 // vecSize is specified in bytes - convert to bits. 1920 unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue() * 8); 1921 1922 // the vector size needs to be an integral multiple of the type size. 1923 if (vectorSize % typeSize) { 1924 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_size) 1925 << sizeExpr->getSourceRange(); 1926 Attr.setInvalid(); 1927 return; 1928 } 1929 if (vectorSize == 0) { 1930 S.Diag(Attr.getLoc(), diag::err_attribute_zero_size) 1931 << sizeExpr->getSourceRange(); 1932 Attr.setInvalid(); 1933 return; 1934 } 1935 1936 // Success! Instantiate the vector type, the number of elements is > 0, and 1937 // not required to be a power of 2, unlike GCC. 1938 CurType = S.Context.getVectorType(CurType, vectorSize/typeSize, false, false); 1939} 1940 1941void ProcessTypeAttributeList(Sema &S, QualType &Result, 1942 bool IsDeclSpec, const AttributeList *AL, 1943 DelayedAttributeSet &FnAttrs) { 1944 // Scan through and apply attributes to this type where it makes sense. Some 1945 // attributes (such as __address_space__, __vector_size__, etc) apply to the 1946 // type, but others can be present in the type specifiers even though they 1947 // apply to the decl. Here we apply type attributes and ignore the rest. 1948 for (; AL; AL = AL->getNext()) { 1949 // Skip attributes that were marked to be invalid. 1950 if (AL->isInvalid()) 1951 continue; 1952 1953 // If this is an attribute we can handle, do so now, 1954 // otherwise, add it to the FnAttrs list for rechaining. 1955 switch (AL->getKind()) { 1956 default: break; 1957 1958 case AttributeList::AT_address_space: 1959 HandleAddressSpaceTypeAttribute(Result, *AL, S); 1960 break; 1961 case AttributeList::AT_objc_gc: 1962 HandleObjCGCTypeAttribute(Result, *AL, S); 1963 break; 1964 case AttributeList::AT_vector_size: 1965 HandleVectorSizeAttr(Result, *AL, S); 1966 break; 1967 1968 case AttributeList::AT_noreturn: 1969 case AttributeList::AT_cdecl: 1970 case AttributeList::AT_fastcall: 1971 case AttributeList::AT_stdcall: 1972 case AttributeList::AT_thiscall: 1973 case AttributeList::AT_regparm: 1974 // Don't process these on the DeclSpec. 1975 if (IsDeclSpec || 1976 ProcessFnAttr(S, Result, *AL)) 1977 FnAttrs.push_back(DelayedAttribute(AL, Result)); 1978 break; 1979 } 1980 } 1981} 1982 1983/// @brief Ensure that the type T is a complete type. 1984/// 1985/// This routine checks whether the type @p T is complete in any 1986/// context where a complete type is required. If @p T is a complete 1987/// type, returns false. If @p T is a class template specialization, 1988/// this routine then attempts to perform class template 1989/// instantiation. If instantiation fails, or if @p T is incomplete 1990/// and cannot be completed, issues the diagnostic @p diag (giving it 1991/// the type @p T) and returns true. 1992/// 1993/// @param Loc The location in the source that the incomplete type 1994/// diagnostic should refer to. 1995/// 1996/// @param T The type that this routine is examining for completeness. 1997/// 1998/// @param PD The partial diagnostic that will be printed out if T is not a 1999/// complete type. 2000/// 2001/// @returns @c true if @p T is incomplete and a diagnostic was emitted, 2002/// @c false otherwise. 2003bool Sema::RequireCompleteType(SourceLocation Loc, QualType T, 2004 const PartialDiagnostic &PD, 2005 std::pair<SourceLocation, 2006 PartialDiagnostic> Note) { 2007 unsigned diag = PD.getDiagID(); 2008 2009 // FIXME: Add this assertion to make sure we always get instantiation points. 2010 // assert(!Loc.isInvalid() && "Invalid location in RequireCompleteType"); 2011 // FIXME: Add this assertion to help us flush out problems with 2012 // checking for dependent types and type-dependent expressions. 2013 // 2014 // assert(!T->isDependentType() && 2015 // "Can't ask whether a dependent type is complete"); 2016 2017 // If we have a complete type, we're done. 2018 if (!T->isIncompleteType()) 2019 return false; 2020 2021 // If we have a class template specialization or a class member of a 2022 // class template specialization, or an array with known size of such, 2023 // try to instantiate it. 2024 QualType MaybeTemplate = T; 2025 if (const ConstantArrayType *Array = Context.getAsConstantArrayType(T)) 2026 MaybeTemplate = Array->getElementType(); 2027 if (const RecordType *Record = MaybeTemplate->getAs<RecordType>()) { 2028 if (ClassTemplateSpecializationDecl *ClassTemplateSpec 2029 = dyn_cast<ClassTemplateSpecializationDecl>(Record->getDecl())) { 2030 if (ClassTemplateSpec->getSpecializationKind() == TSK_Undeclared) 2031 return InstantiateClassTemplateSpecialization(Loc, ClassTemplateSpec, 2032 TSK_ImplicitInstantiation, 2033 /*Complain=*/diag != 0); 2034 } else if (CXXRecordDecl *Rec 2035 = dyn_cast<CXXRecordDecl>(Record->getDecl())) { 2036 if (CXXRecordDecl *Pattern = Rec->getInstantiatedFromMemberClass()) { 2037 MemberSpecializationInfo *MSInfo = Rec->getMemberSpecializationInfo(); 2038 assert(MSInfo && "Missing member specialization information?"); 2039 // This record was instantiated from a class within a template. 2040 if (MSInfo->getTemplateSpecializationKind() 2041 != TSK_ExplicitSpecialization) 2042 return InstantiateClass(Loc, Rec, Pattern, 2043 getTemplateInstantiationArgs(Rec), 2044 TSK_ImplicitInstantiation, 2045 /*Complain=*/diag != 0); 2046 } 2047 } 2048 } 2049 2050 if (diag == 0) 2051 return true; 2052 2053 const TagType *Tag = 0; 2054 if (const RecordType *Record = T->getAs<RecordType>()) 2055 Tag = Record; 2056 else if (const EnumType *Enum = T->getAs<EnumType>()) 2057 Tag = Enum; 2058 2059 // Avoid diagnosing invalid decls as incomplete. 2060 if (Tag && Tag->getDecl()->isInvalidDecl()) 2061 return true; 2062 2063 // We have an incomplete type. Produce a diagnostic. 2064 Diag(Loc, PD) << T; 2065 2066 // If we have a note, produce it. 2067 if (!Note.first.isInvalid()) 2068 Diag(Note.first, Note.second); 2069 2070 // If the type was a forward declaration of a class/struct/union 2071 // type, produce a note. 2072 if (Tag && !Tag->getDecl()->isInvalidDecl()) 2073 Diag(Tag->getDecl()->getLocation(), 2074 Tag->isBeingDefined() ? diag::note_type_being_defined 2075 : diag::note_forward_declaration) 2076 << QualType(Tag, 0); 2077 2078 return true; 2079} 2080 2081bool Sema::RequireCompleteType(SourceLocation Loc, QualType T, 2082 const PartialDiagnostic &PD) { 2083 return RequireCompleteType(Loc, T, PD, 2084 std::make_pair(SourceLocation(), PDiag(0))); 2085} 2086 2087bool Sema::RequireCompleteType(SourceLocation Loc, QualType T, 2088 unsigned DiagID) { 2089 return RequireCompleteType(Loc, T, PDiag(DiagID), 2090 std::make_pair(SourceLocation(), PDiag(0))); 2091} 2092 2093/// \brief Retrieve a version of the type 'T' that is elaborated by Keyword 2094/// and qualified by the nested-name-specifier contained in SS. 2095QualType Sema::getElaboratedType(ElaboratedTypeKeyword Keyword, 2096 const CXXScopeSpec &SS, QualType T) { 2097 if (T.isNull()) 2098 return T; 2099 NestedNameSpecifier *NNS; 2100 if (SS.isValid()) 2101 NNS = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 2102 else { 2103 if (Keyword == ETK_None) 2104 return T; 2105 NNS = 0; 2106 } 2107 return Context.getElaboratedType(Keyword, NNS, T); 2108} 2109 2110QualType Sema::BuildTypeofExprType(Expr *E) { 2111 if (E->getType() == Context.OverloadTy) { 2112 // C++ [temp.arg.explicit]p3 allows us to resolve a template-id to a 2113 // function template specialization wherever deduction cannot occur. 2114 if (FunctionDecl *Specialization 2115 = ResolveSingleFunctionTemplateSpecialization(E)) { 2116 // The access doesn't really matter in this case. 2117 DeclAccessPair Found = DeclAccessPair::make(Specialization, 2118 Specialization->getAccess()); 2119 E = FixOverloadedFunctionReference(E, Found, Specialization); 2120 if (!E) 2121 return QualType(); 2122 } else { 2123 Diag(E->getLocStart(), 2124 diag::err_cannot_determine_declared_type_of_overloaded_function) 2125 << false << E->getSourceRange(); 2126 return QualType(); 2127 } 2128 } 2129 2130 return Context.getTypeOfExprType(E); 2131} 2132 2133QualType Sema::BuildDecltypeType(Expr *E) { 2134 if (E->getType() == Context.OverloadTy) { 2135 // C++ [temp.arg.explicit]p3 allows us to resolve a template-id to a 2136 // function template specialization wherever deduction cannot occur. 2137 if (FunctionDecl *Specialization 2138 = ResolveSingleFunctionTemplateSpecialization(E)) { 2139 // The access doesn't really matter in this case. 2140 DeclAccessPair Found = DeclAccessPair::make(Specialization, 2141 Specialization->getAccess()); 2142 E = FixOverloadedFunctionReference(E, Found, Specialization); 2143 if (!E) 2144 return QualType(); 2145 } else { 2146 Diag(E->getLocStart(), 2147 diag::err_cannot_determine_declared_type_of_overloaded_function) 2148 << true << E->getSourceRange(); 2149 return QualType(); 2150 } 2151 } 2152 2153 return Context.getDecltypeType(E); 2154} 2155