SemaType.cpp revision 19510856727e0e14a3696b2a72c35163bff2a71f
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/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/Basic/TargetInfo.h" 24#include "clang/Sema/DeclSpec.h" 25#include "llvm/ADT/SmallPtrSet.h" 26#include "llvm/Support/ErrorHandling.h" 27using namespace clang; 28 29/// \brief Perform adjustment on the parameter type of a function. 30/// 31/// This routine adjusts the given parameter type @p T to the actual 32/// parameter type used by semantic analysis (C99 6.7.5.3p[7,8], 33/// C++ [dcl.fct]p3). The adjusted parameter type is returned. 34QualType Sema::adjustParameterType(QualType T) { 35 // C99 6.7.5.3p7: 36 // A declaration of a parameter as "array of type" shall be 37 // adjusted to "qualified pointer to type", where the type 38 // qualifiers (if any) are those specified within the [ and ] of 39 // the array type derivation. 40 if (T->isArrayType()) 41 return Context.getArrayDecayedType(T); 42 43 // C99 6.7.5.3p8: 44 // A declaration of a parameter as "function returning type" 45 // shall be adjusted to "pointer to function returning type", as 46 // in 6.3.2.1. 47 if (T->isFunctionType()) 48 return Context.getPointerType(T); 49 50 return T; 51} 52 53 54 55/// isOmittedBlockReturnType - Return true if this declarator is missing a 56/// return type because this is a omitted return type on a block literal. 57static bool isOmittedBlockReturnType(const Declarator &D) { 58 if (D.getContext() != Declarator::BlockLiteralContext || 59 D.getDeclSpec().hasTypeSpecifier()) 60 return false; 61 62 if (D.getNumTypeObjects() == 0) 63 return true; // ^{ ... } 64 65 if (D.getNumTypeObjects() == 1 && 66 D.getTypeObject(0).Kind == DeclaratorChunk::Function) 67 return true; // ^(int X, float Y) { ... } 68 69 return false; 70} 71 72typedef std::pair<const AttributeList*,QualType> DelayedAttribute; 73typedef llvm::SmallVectorImpl<DelayedAttribute> DelayedAttributeSet; 74 75static void ProcessTypeAttributeList(Sema &S, QualType &Type, 76 bool IsDeclSpec, 77 const AttributeList *Attrs, 78 DelayedAttributeSet &DelayedFnAttrs); 79static bool ProcessFnAttr(Sema &S, QualType &Type, const AttributeList &Attr); 80 81static void ProcessDelayedFnAttrs(Sema &S, QualType &Type, 82 DelayedAttributeSet &Attrs) { 83 for (DelayedAttributeSet::iterator I = Attrs.begin(), 84 E = Attrs.end(); I != E; ++I) 85 if (ProcessFnAttr(S, Type, *I->first)) { 86 S.Diag(I->first->getLoc(), diag::warn_function_attribute_wrong_type) 87 << I->first->getName() << I->second; 88 // Avoid any further processing of this attribute. 89 I->first->setInvalid(); 90 } 91 Attrs.clear(); 92} 93 94static void DiagnoseDelayedFnAttrs(Sema &S, DelayedAttributeSet &Attrs) { 95 for (DelayedAttributeSet::iterator I = Attrs.begin(), 96 E = Attrs.end(); I != E; ++I) { 97 S.Diag(I->first->getLoc(), diag::warn_function_attribute_wrong_type) 98 << I->first->getName() << I->second; 99 // Avoid any further processing of this attribute. 100 I->first->setInvalid(); 101 } 102 Attrs.clear(); 103} 104 105/// \brief Convert the specified declspec to the appropriate type 106/// object. 107/// \param D the declarator containing the declaration specifier. 108/// \returns The type described by the declaration specifiers. This function 109/// never returns null. 110static QualType ConvertDeclSpecToType(Sema &TheSema, 111 Declarator &TheDeclarator, 112 DelayedAttributeSet &Delayed) { 113 // FIXME: Should move the logic from DeclSpec::Finish to here for validity 114 // checking. 115 const DeclSpec &DS = TheDeclarator.getDeclSpec(); 116 SourceLocation DeclLoc = TheDeclarator.getIdentifierLoc(); 117 if (DeclLoc.isInvalid()) 118 DeclLoc = DS.getSourceRange().getBegin(); 119 120 ASTContext &Context = TheSema.Context; 121 122 QualType Result; 123 switch (DS.getTypeSpecType()) { 124 case DeclSpec::TST_void: 125 Result = Context.VoidTy; 126 break; 127 case DeclSpec::TST_char: 128 if (DS.getTypeSpecSign() == DeclSpec::TSS_unspecified) 129 Result = Context.CharTy; 130 else if (DS.getTypeSpecSign() == DeclSpec::TSS_signed) 131 Result = Context.SignedCharTy; 132 else { 133 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unsigned && 134 "Unknown TSS value"); 135 Result = Context.UnsignedCharTy; 136 } 137 break; 138 case DeclSpec::TST_wchar: 139 if (DS.getTypeSpecSign() == DeclSpec::TSS_unspecified) 140 Result = Context.WCharTy; 141 else if (DS.getTypeSpecSign() == DeclSpec::TSS_signed) { 142 TheSema.Diag(DS.getTypeSpecSignLoc(), diag::ext_invalid_sign_spec) 143 << DS.getSpecifierName(DS.getTypeSpecType()); 144 Result = Context.getSignedWCharType(); 145 } else { 146 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unsigned && 147 "Unknown TSS value"); 148 TheSema.Diag(DS.getTypeSpecSignLoc(), diag::ext_invalid_sign_spec) 149 << DS.getSpecifierName(DS.getTypeSpecType()); 150 Result = Context.getUnsignedWCharType(); 151 } 152 break; 153 case DeclSpec::TST_char16: 154 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unspecified && 155 "Unknown TSS value"); 156 Result = Context.Char16Ty; 157 break; 158 case DeclSpec::TST_char32: 159 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unspecified && 160 "Unknown TSS value"); 161 Result = Context.Char32Ty; 162 break; 163 case DeclSpec::TST_unspecified: 164 // "<proto1,proto2>" is an objc qualified ID with a missing id. 165 if (DeclSpec::ProtocolQualifierListTy PQ = DS.getProtocolQualifiers()) { 166 Result = Context.getObjCObjectType(Context.ObjCBuiltinIdTy, 167 (ObjCProtocolDecl**)PQ, 168 DS.getNumProtocolQualifiers()); 169 Result = Context.getObjCObjectPointerType(Result); 170 break; 171 } 172 173 // If this is a missing declspec in a block literal return context, then it 174 // is inferred from the return statements inside the block. 175 if (isOmittedBlockReturnType(TheDeclarator)) { 176 Result = Context.DependentTy; 177 break; 178 } 179 180 // Unspecified typespec defaults to int in C90. However, the C90 grammar 181 // [C90 6.5] only allows a decl-spec if there was *some* type-specifier, 182 // type-qualifier, or storage-class-specifier. If not, emit an extwarn. 183 // Note that the one exception to this is function definitions, which are 184 // allowed to be completely missing a declspec. This is handled in the 185 // parser already though by it pretending to have seen an 'int' in this 186 // case. 187 if (TheSema.getLangOptions().ImplicitInt) { 188 // In C89 mode, we only warn if there is a completely missing declspec 189 // when one is not allowed. 190 if (DS.isEmpty()) { 191 TheSema.Diag(DeclLoc, diag::ext_missing_declspec) 192 << DS.getSourceRange() 193 << FixItHint::CreateInsertion(DS.getSourceRange().getBegin(), "int"); 194 } 195 } else if (!DS.hasTypeSpecifier()) { 196 // C99 and C++ require a type specifier. For example, C99 6.7.2p2 says: 197 // "At least one type specifier shall be given in the declaration 198 // specifiers in each declaration, and in the specifier-qualifier list in 199 // each struct declaration and type name." 200 // FIXME: Does Microsoft really have the implicit int extension in C++? 201 if (TheSema.getLangOptions().CPlusPlus && 202 !TheSema.getLangOptions().Microsoft) { 203 TheSema.Diag(DeclLoc, diag::err_missing_type_specifier) 204 << DS.getSourceRange(); 205 206 // When this occurs in C++ code, often something is very broken with the 207 // value being declared, poison it as invalid so we don't get chains of 208 // errors. 209 TheDeclarator.setInvalidType(true); 210 } else { 211 TheSema.Diag(DeclLoc, diag::ext_missing_type_specifier) 212 << DS.getSourceRange(); 213 } 214 } 215 216 // FALL THROUGH. 217 case DeclSpec::TST_int: { 218 if (DS.getTypeSpecSign() != DeclSpec::TSS_unsigned) { 219 switch (DS.getTypeSpecWidth()) { 220 case DeclSpec::TSW_unspecified: Result = Context.IntTy; break; 221 case DeclSpec::TSW_short: Result = Context.ShortTy; break; 222 case DeclSpec::TSW_long: Result = Context.LongTy; break; 223 case DeclSpec::TSW_longlong: 224 Result = Context.LongLongTy; 225 226 // long long is a C99 feature. 227 if (!TheSema.getLangOptions().C99 && 228 !TheSema.getLangOptions().CPlusPlus0x) 229 TheSema.Diag(DS.getTypeSpecWidthLoc(), diag::ext_longlong); 230 break; 231 } 232 } else { 233 switch (DS.getTypeSpecWidth()) { 234 case DeclSpec::TSW_unspecified: Result = Context.UnsignedIntTy; break; 235 case DeclSpec::TSW_short: Result = Context.UnsignedShortTy; break; 236 case DeclSpec::TSW_long: Result = Context.UnsignedLongTy; break; 237 case DeclSpec::TSW_longlong: 238 Result = Context.UnsignedLongLongTy; 239 240 // long long is a C99 feature. 241 if (!TheSema.getLangOptions().C99 && 242 !TheSema.getLangOptions().CPlusPlus0x) 243 TheSema.Diag(DS.getTypeSpecWidthLoc(), diag::ext_longlong); 244 break; 245 } 246 } 247 break; 248 } 249 case DeclSpec::TST_float: Result = Context.FloatTy; break; 250 case DeclSpec::TST_double: 251 if (DS.getTypeSpecWidth() == DeclSpec::TSW_long) 252 Result = Context.LongDoubleTy; 253 else 254 Result = Context.DoubleTy; 255 break; 256 case DeclSpec::TST_bool: Result = Context.BoolTy; break; // _Bool or bool 257 case DeclSpec::TST_decimal32: // _Decimal32 258 case DeclSpec::TST_decimal64: // _Decimal64 259 case DeclSpec::TST_decimal128: // _Decimal128 260 TheSema.Diag(DS.getTypeSpecTypeLoc(), diag::err_decimal_unsupported); 261 Result = Context.IntTy; 262 TheDeclarator.setInvalidType(true); 263 break; 264 case DeclSpec::TST_class: 265 case DeclSpec::TST_enum: 266 case DeclSpec::TST_union: 267 case DeclSpec::TST_struct: { 268 TypeDecl *D 269 = dyn_cast_or_null<TypeDecl>(static_cast<Decl *>(DS.getTypeRep())); 270 if (!D) { 271 // This can happen in C++ with ambiguous lookups. 272 Result = Context.IntTy; 273 TheDeclarator.setInvalidType(true); 274 break; 275 } 276 277 // If the type is deprecated or unavailable, diagnose it. 278 TheSema.DiagnoseUseOfDecl(D, DS.getTypeSpecTypeLoc()); 279 280 assert(DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 && 281 DS.getTypeSpecSign() == 0 && "No qualifiers on tag names!"); 282 283 // TypeQuals handled by caller. 284 Result = Context.getTypeDeclType(D); 285 286 // In C++, make an ElaboratedType. 287 if (TheSema.getLangOptions().CPlusPlus) { 288 ElaboratedTypeKeyword Keyword 289 = ElaboratedType::getKeywordForTypeSpec(DS.getTypeSpecType()); 290 Result = TheSema.getElaboratedType(Keyword, DS.getTypeSpecScope(), 291 Result); 292 } 293 if (D->isInvalidDecl()) 294 TheDeclarator.setInvalidType(true); 295 break; 296 } 297 case DeclSpec::TST_typename: { 298 assert(DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 && 299 DS.getTypeSpecSign() == 0 && 300 "Can't handle qualifiers on typedef names yet!"); 301 Result = TheSema.GetTypeFromParser(DS.getTypeRep()); 302 if (Result.isNull()) 303 TheDeclarator.setInvalidType(true); 304 else if (DeclSpec::ProtocolQualifierListTy PQ 305 = DS.getProtocolQualifiers()) { 306 if (const ObjCObjectType *ObjT = Result->getAs<ObjCObjectType>()) { 307 // Silently drop any existing protocol qualifiers. 308 // TODO: determine whether that's the right thing to do. 309 if (ObjT->getNumProtocols()) 310 Result = ObjT->getBaseType(); 311 312 if (DS.getNumProtocolQualifiers()) 313 Result = Context.getObjCObjectType(Result, 314 (ObjCProtocolDecl**) PQ, 315 DS.getNumProtocolQualifiers()); 316 } else if (Result->isObjCIdType()) { 317 // id<protocol-list> 318 Result = Context.getObjCObjectType(Context.ObjCBuiltinIdTy, 319 (ObjCProtocolDecl**) PQ, 320 DS.getNumProtocolQualifiers()); 321 Result = Context.getObjCObjectPointerType(Result); 322 } else if (Result->isObjCClassType()) { 323 // Class<protocol-list> 324 Result = Context.getObjCObjectType(Context.ObjCBuiltinClassTy, 325 (ObjCProtocolDecl**) PQ, 326 DS.getNumProtocolQualifiers()); 327 Result = Context.getObjCObjectPointerType(Result); 328 } else { 329 TheSema.Diag(DeclLoc, diag::err_invalid_protocol_qualifiers) 330 << DS.getSourceRange(); 331 TheDeclarator.setInvalidType(true); 332 } 333 } 334 335 // TypeQuals handled by caller. 336 break; 337 } 338 case DeclSpec::TST_typeofType: 339 // FIXME: Preserve type source info. 340 Result = TheSema.GetTypeFromParser(DS.getTypeRep()); 341 assert(!Result.isNull() && "Didn't get a type for typeof?"); 342 // TypeQuals handled by caller. 343 Result = Context.getTypeOfType(Result); 344 break; 345 case DeclSpec::TST_typeofExpr: { 346 Expr *E = static_cast<Expr *>(DS.getTypeRep()); 347 assert(E && "Didn't get an expression for typeof?"); 348 // TypeQuals handled by caller. 349 Result = TheSema.BuildTypeofExprType(E); 350 if (Result.isNull()) { 351 Result = Context.IntTy; 352 TheDeclarator.setInvalidType(true); 353 } 354 break; 355 } 356 case DeclSpec::TST_decltype: { 357 Expr *E = static_cast<Expr *>(DS.getTypeRep()); 358 assert(E && "Didn't get an expression for decltype?"); 359 // TypeQuals handled by caller. 360 Result = TheSema.BuildDecltypeType(E); 361 if (Result.isNull()) { 362 Result = Context.IntTy; 363 TheDeclarator.setInvalidType(true); 364 } 365 break; 366 } 367 case DeclSpec::TST_auto: { 368 // TypeQuals handled by caller. 369 Result = Context.UndeducedAutoTy; 370 break; 371 } 372 373 case DeclSpec::TST_error: 374 Result = Context.IntTy; 375 TheDeclarator.setInvalidType(true); 376 break; 377 } 378 379 // Handle complex types. 380 if (DS.getTypeSpecComplex() == DeclSpec::TSC_complex) { 381 if (TheSema.getLangOptions().Freestanding) 382 TheSema.Diag(DS.getTypeSpecComplexLoc(), diag::ext_freestanding_complex); 383 Result = Context.getComplexType(Result); 384 } else if (DS.isTypeAltiVecVector()) { 385 unsigned typeSize = static_cast<unsigned>(Context.getTypeSize(Result)); 386 assert(typeSize > 0 && "type size for vector must be greater than 0 bits"); 387 VectorType::AltiVecSpecific AltiVecSpec = VectorType::AltiVec; 388 if (DS.isTypeAltiVecPixel()) 389 AltiVecSpec = VectorType::Pixel; 390 else if (DS.isTypeAltiVecBool()) 391 AltiVecSpec = VectorType::Bool; 392 Result = Context.getVectorType(Result, 128/typeSize, AltiVecSpec); 393 } 394 395 assert(DS.getTypeSpecComplex() != DeclSpec::TSC_imaginary && 396 "FIXME: imaginary types not supported yet!"); 397 398 // See if there are any attributes on the declspec that apply to the type (as 399 // opposed to the decl). 400 if (const AttributeList *AL = DS.getAttributes()) 401 ProcessTypeAttributeList(TheSema, Result, true, AL, Delayed); 402 403 // Apply const/volatile/restrict qualifiers to T. 404 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 405 406 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 407 // or incomplete types shall not be restrict-qualified." C++ also allows 408 // restrict-qualified references. 409 if (TypeQuals & DeclSpec::TQ_restrict) { 410 if (Result->isAnyPointerType() || Result->isReferenceType()) { 411 QualType EltTy; 412 if (Result->isObjCObjectPointerType()) 413 EltTy = Result; 414 else 415 EltTy = Result->isPointerType() ? 416 Result->getAs<PointerType>()->getPointeeType() : 417 Result->getAs<ReferenceType>()->getPointeeType(); 418 419 // If we have a pointer or reference, the pointee must have an object 420 // incomplete type. 421 if (!EltTy->isIncompleteOrObjectType()) { 422 TheSema.Diag(DS.getRestrictSpecLoc(), 423 diag::err_typecheck_invalid_restrict_invalid_pointee) 424 << EltTy << DS.getSourceRange(); 425 TypeQuals &= ~DeclSpec::TQ_restrict; // Remove the restrict qualifier. 426 } 427 } else { 428 TheSema.Diag(DS.getRestrictSpecLoc(), 429 diag::err_typecheck_invalid_restrict_not_pointer) 430 << Result << DS.getSourceRange(); 431 TypeQuals &= ~DeclSpec::TQ_restrict; // Remove the restrict qualifier. 432 } 433 } 434 435 // Warn about CV qualifiers on functions: C99 6.7.3p8: "If the specification 436 // of a function type includes any type qualifiers, the behavior is 437 // undefined." 438 if (Result->isFunctionType() && TypeQuals) { 439 // Get some location to point at, either the C or V location. 440 SourceLocation Loc; 441 if (TypeQuals & DeclSpec::TQ_const) 442 Loc = DS.getConstSpecLoc(); 443 else if (TypeQuals & DeclSpec::TQ_volatile) 444 Loc = DS.getVolatileSpecLoc(); 445 else { 446 assert((TypeQuals & DeclSpec::TQ_restrict) && 447 "Has CVR quals but not C, V, or R?"); 448 Loc = DS.getRestrictSpecLoc(); 449 } 450 TheSema.Diag(Loc, diag::warn_typecheck_function_qualifiers) 451 << Result << DS.getSourceRange(); 452 } 453 454 // C++ [dcl.ref]p1: 455 // Cv-qualified references are ill-formed except when the 456 // cv-qualifiers are introduced through the use of a typedef 457 // (7.1.3) or of a template type argument (14.3), in which 458 // case the cv-qualifiers are ignored. 459 // FIXME: Shouldn't we be checking SCS_typedef here? 460 if (DS.getTypeSpecType() == DeclSpec::TST_typename && 461 TypeQuals && Result->isReferenceType()) { 462 TypeQuals &= ~DeclSpec::TQ_const; 463 TypeQuals &= ~DeclSpec::TQ_volatile; 464 } 465 466 Qualifiers Quals = Qualifiers::fromCVRMask(TypeQuals); 467 Result = Context.getQualifiedType(Result, Quals); 468 } 469 470 return Result; 471} 472 473static std::string getPrintableNameForEntity(DeclarationName Entity) { 474 if (Entity) 475 return Entity.getAsString(); 476 477 return "type name"; 478} 479 480QualType Sema::BuildQualifiedType(QualType T, SourceLocation Loc, 481 Qualifiers Qs) { 482 // Enforce C99 6.7.3p2: "Types other than pointer types derived from 483 // object or incomplete types shall not be restrict-qualified." 484 if (Qs.hasRestrict()) { 485 unsigned DiagID = 0; 486 QualType ProblemTy; 487 488 const Type *Ty = T->getCanonicalTypeInternal().getTypePtr(); 489 if (const ReferenceType *RTy = dyn_cast<ReferenceType>(Ty)) { 490 if (!RTy->getPointeeType()->isIncompleteOrObjectType()) { 491 DiagID = diag::err_typecheck_invalid_restrict_invalid_pointee; 492 ProblemTy = T->getAs<ReferenceType>()->getPointeeType(); 493 } 494 } else if (const PointerType *PTy = dyn_cast<PointerType>(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 (const MemberPointerType *PTy = dyn_cast<MemberPointerType>(Ty)) { 500 if (!PTy->getPointeeType()->isIncompleteOrObjectType()) { 501 DiagID = diag::err_typecheck_invalid_restrict_invalid_pointee; 502 ProblemTy = T->getAs<PointerType>()->getPointeeType(); 503 } 504 } else if (!Ty->isDependentType()) { 505 // FIXME: this deserves a proper diagnostic 506 DiagID = diag::err_typecheck_invalid_restrict_invalid_pointee; 507 ProblemTy = T; 508 } 509 510 if (DiagID) { 511 Diag(Loc, DiagID) << ProblemTy; 512 Qs.removeRestrict(); 513 } 514 } 515 516 return Context.getQualifiedType(T, Qs); 517} 518 519/// \brief Build a pointer type. 520/// 521/// \param T The type to which we'll be building a pointer. 522/// 523/// \param Loc The location of the entity whose type involves this 524/// pointer type or, if there is no such entity, the location of the 525/// type that will have pointer type. 526/// 527/// \param Entity The name of the entity that involves the pointer 528/// type, if known. 529/// 530/// \returns A suitable pointer type, if there are no 531/// errors. Otherwise, returns a NULL type. 532QualType Sema::BuildPointerType(QualType T, 533 SourceLocation Loc, DeclarationName Entity) { 534 if (T->isReferenceType()) { 535 // C++ 8.3.2p4: There shall be no ... pointers to references ... 536 Diag(Loc, diag::err_illegal_decl_pointer_to_reference) 537 << getPrintableNameForEntity(Entity) << T; 538 return QualType(); 539 } 540 541 assert(!T->isObjCObjectType() && "Should build ObjCObjectPointerType"); 542 543 // Build the pointer type. 544 return Context.getPointerType(T); 545} 546 547/// \brief Build a reference type. 548/// 549/// \param T The type to which we'll be building a reference. 550/// 551/// \param Loc The location of the entity whose type involves this 552/// reference type or, if there is no such entity, the location of the 553/// type that will have reference type. 554/// 555/// \param Entity The name of the entity that involves the reference 556/// type, if known. 557/// 558/// \returns A suitable reference type, if there are no 559/// errors. Otherwise, returns a NULL type. 560QualType Sema::BuildReferenceType(QualType T, bool SpelledAsLValue, 561 SourceLocation Loc, 562 DeclarationName Entity) { 563 bool LValueRef = SpelledAsLValue || T->getAs<LValueReferenceType>(); 564 565 // C++0x [dcl.typedef]p9: If a typedef TD names a type that is a 566 // reference to a type T, and attempt to create the type "lvalue 567 // reference to cv TD" creates the type "lvalue reference to T". 568 // We use the qualifiers (restrict or none) of the original reference, 569 // not the new ones. This is consistent with GCC. 570 571 // C++ [dcl.ref]p4: There shall be no references to references. 572 // 573 // According to C++ DR 106, references to references are only 574 // diagnosed when they are written directly (e.g., "int & &"), 575 // but not when they happen via a typedef: 576 // 577 // typedef int& intref; 578 // typedef intref& intref2; 579 // 580 // Parser::ParseDeclaratorInternal diagnoses the case where 581 // references are written directly; here, we handle the 582 // collapsing of references-to-references as described in C++ 583 // DR 106 and amended by C++ DR 540. 584 585 // C++ [dcl.ref]p1: 586 // A declarator that specifies the type "reference to cv void" 587 // is ill-formed. 588 if (T->isVoidType()) { 589 Diag(Loc, diag::err_reference_to_void); 590 return QualType(); 591 } 592 593 // Handle restrict on references. 594 if (LValueRef) 595 return Context.getLValueReferenceType(T, SpelledAsLValue); 596 return Context.getRValueReferenceType(T); 597} 598 599/// \brief Build an array type. 600/// 601/// \param T The type of each element in the array. 602/// 603/// \param ASM C99 array size modifier (e.g., '*', 'static'). 604/// 605/// \param ArraySize Expression describing the size of the array. 606/// 607/// \param Loc The location of the entity whose type involves this 608/// array type or, if there is no such entity, the location of the 609/// type that will have array type. 610/// 611/// \param Entity The name of the entity that involves the array 612/// type, if known. 613/// 614/// \returns A suitable array type, if there are no errors. Otherwise, 615/// returns a NULL type. 616QualType Sema::BuildArrayType(QualType T, ArrayType::ArraySizeModifier ASM, 617 Expr *ArraySize, unsigned Quals, 618 SourceRange Brackets, DeclarationName Entity) { 619 620 SourceLocation Loc = Brackets.getBegin(); 621 if (getLangOptions().CPlusPlus) { 622 // C++ [dcl.array]p1: 623 // T is called the array element type; this type shall not be a reference 624 // type, the (possibly cv-qualified) type void, a function type or an 625 // abstract class type. 626 // 627 // Note: function types are handled in the common path with C. 628 if (T->isReferenceType()) { 629 Diag(Loc, diag::err_illegal_decl_array_of_references) 630 << getPrintableNameForEntity(Entity) << T; 631 return QualType(); 632 } 633 634 if (T->isVoidType()) { 635 Diag(Loc, diag::err_illegal_decl_array_incomplete_type) << T; 636 return QualType(); 637 } 638 639 if (RequireNonAbstractType(Brackets.getBegin(), T, 640 diag::err_array_of_abstract_type)) 641 return QualType(); 642 643 } else { 644 // C99 6.7.5.2p1: If the element type is an incomplete or function type, 645 // reject it (e.g. void ary[7], struct foo ary[7], void ary[7]()) 646 if (RequireCompleteType(Loc, T, 647 diag::err_illegal_decl_array_incomplete_type)) 648 return QualType(); 649 } 650 651 if (T->isFunctionType()) { 652 Diag(Loc, diag::err_illegal_decl_array_of_functions) 653 << getPrintableNameForEntity(Entity) << T; 654 return QualType(); 655 } 656 657 if (Context.getCanonicalType(T) == Context.UndeducedAutoTy) { 658 Diag(Loc, diag::err_illegal_decl_array_of_auto) 659 << getPrintableNameForEntity(Entity); 660 return QualType(); 661 } 662 663 if (const RecordType *EltTy = T->getAs<RecordType>()) { 664 // If the element type is a struct or union that contains a variadic 665 // array, accept it as a GNU extension: C99 6.7.2.1p2. 666 if (EltTy->getDecl()->hasFlexibleArrayMember()) 667 Diag(Loc, diag::ext_flexible_array_in_array) << T; 668 } else if (T->isObjCObjectType()) { 669 Diag(Loc, diag::err_objc_array_of_interfaces) << T; 670 return QualType(); 671 } 672 673 // C99 6.7.5.2p1: The size expression shall have integer type. 674 if (ArraySize && !ArraySize->isTypeDependent() && 675 !ArraySize->getType()->isIntegerType()) { 676 Diag(ArraySize->getLocStart(), diag::err_array_size_non_int) 677 << ArraySize->getType() << ArraySize->getSourceRange(); 678 return QualType(); 679 } 680 llvm::APSInt ConstVal(Context.getTypeSize(Context.getSizeType())); 681 if (!ArraySize) { 682 if (ASM == ArrayType::Star) 683 T = Context.getVariableArrayType(T, 0, ASM, Quals, Brackets); 684 else 685 T = Context.getIncompleteArrayType(T, ASM, Quals); 686 } else if (ArraySize->isTypeDependent() || ArraySize->isValueDependent()) { 687 T = Context.getDependentSizedArrayType(T, ArraySize, ASM, Quals, Brackets); 688 } else if (!ArraySize->isIntegerConstantExpr(ConstVal, Context) || 689 (!T->isDependentType() && !T->isIncompleteType() && 690 !T->isConstantSizeType())) { 691 // Per C99, a variable array is an array with either a non-constant 692 // size or an element type that has a non-constant-size 693 T = Context.getVariableArrayType(T, ArraySize, ASM, Quals, Brackets); 694 } else { 695 // C99 6.7.5.2p1: If the expression is a constant expression, it shall 696 // have a value greater than zero. 697 if (ConstVal.isSigned() && ConstVal.isNegative()) { 698 Diag(ArraySize->getLocStart(), 699 diag::err_typecheck_negative_array_size) 700 << ArraySize->getSourceRange(); 701 return QualType(); 702 } 703 if (ConstVal == 0) { 704 // GCC accepts zero sized static arrays. We allow them when 705 // we're not in a SFINAE context. 706 Diag(ArraySize->getLocStart(), 707 isSFINAEContext()? diag::err_typecheck_zero_array_size 708 : diag::ext_typecheck_zero_array_size) 709 << ArraySize->getSourceRange(); 710 } else if (!T->isDependentType() && !T->isVariablyModifiedType() && 711 !T->isIncompleteType()) { 712 // Is the array too large? 713 unsigned ActiveSizeBits 714 = ConstantArrayType::getNumAddressingBits(Context, T, ConstVal); 715 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) 716 Diag(ArraySize->getLocStart(), diag::err_array_too_large) 717 << ConstVal.toString(10) 718 << ArraySize->getSourceRange(); 719 } 720 721 T = Context.getConstantArrayType(T, ConstVal, ASM, Quals); 722 } 723 // If this is not C99, extwarn about VLA's and C99 array size modifiers. 724 if (!getLangOptions().C99) { 725 if (T->isVariableArrayType()) { 726 // Prohibit the use of non-POD types in VLAs. 727 if (!T->isDependentType() && 728 !Context.getBaseElementType(T)->isPODType()) { 729 Diag(Loc, diag::err_vla_non_pod) 730 << Context.getBaseElementType(T); 731 return QualType(); 732 } 733 // Prohibit the use of VLAs during template argument deduction. 734 else if (isSFINAEContext()) { 735 Diag(Loc, diag::err_vla_in_sfinae); 736 return QualType(); 737 } 738 // Just extwarn about VLAs. 739 else 740 Diag(Loc, diag::ext_vla); 741 } else if (ASM != ArrayType::Normal || Quals != 0) 742 Diag(Loc, 743 getLangOptions().CPlusPlus? diag::err_c99_array_usage_cxx 744 : diag::ext_c99_array_usage); 745 } 746 747 return T; 748} 749 750/// \brief Build an ext-vector type. 751/// 752/// Run the required checks for the extended vector type. 753QualType Sema::BuildExtVectorType(QualType T, ExprArg ArraySize, 754 SourceLocation AttrLoc) { 755 756 Expr *Arg = (Expr *)ArraySize.get(); 757 758 // unlike gcc's vector_size attribute, we do not allow vectors to be defined 759 // in conjunction with complex types (pointers, arrays, functions, etc.). 760 if (!T->isDependentType() && 761 !T->isIntegerType() && !T->isRealFloatingType()) { 762 Diag(AttrLoc, diag::err_attribute_invalid_vector_type) << T; 763 return QualType(); 764 } 765 766 if (!Arg->isTypeDependent() && !Arg->isValueDependent()) { 767 llvm::APSInt vecSize(32); 768 if (!Arg->isIntegerConstantExpr(vecSize, Context)) { 769 Diag(AttrLoc, diag::err_attribute_argument_not_int) 770 << "ext_vector_type" << Arg->getSourceRange(); 771 return QualType(); 772 } 773 774 // unlike gcc's vector_size attribute, the size is specified as the 775 // number of elements, not the number of bytes. 776 unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue()); 777 778 if (vectorSize == 0) { 779 Diag(AttrLoc, diag::err_attribute_zero_size) 780 << Arg->getSourceRange(); 781 return QualType(); 782 } 783 784 if (!T->isDependentType()) 785 return Context.getExtVectorType(T, vectorSize); 786 } 787 788 return Context.getDependentSizedExtVectorType(T, ArraySize.takeAs<Expr>(), 789 AttrLoc); 790} 791 792/// \brief Build a function type. 793/// 794/// This routine checks the function type according to C++ rules and 795/// under the assumption that the result type and parameter types have 796/// just been instantiated from a template. It therefore duplicates 797/// some of the behavior of GetTypeForDeclarator, but in a much 798/// simpler form that is only suitable for this narrow use case. 799/// 800/// \param T The return type of the function. 801/// 802/// \param ParamTypes The parameter types of the function. This array 803/// will be modified to account for adjustments to the types of the 804/// function parameters. 805/// 806/// \param NumParamTypes The number of parameter types in ParamTypes. 807/// 808/// \param Variadic Whether this is a variadic function type. 809/// 810/// \param Quals The cvr-qualifiers to be applied to the function type. 811/// 812/// \param Loc The location of the entity whose type involves this 813/// function type or, if there is no such entity, the location of the 814/// type that will have function type. 815/// 816/// \param Entity The name of the entity that involves the function 817/// type, if known. 818/// 819/// \returns A suitable function type, if there are no 820/// errors. Otherwise, returns a NULL type. 821QualType Sema::BuildFunctionType(QualType T, 822 QualType *ParamTypes, 823 unsigned NumParamTypes, 824 bool Variadic, unsigned Quals, 825 SourceLocation Loc, DeclarationName Entity, 826 const FunctionType::ExtInfo &Info) { 827 if (T->isArrayType() || T->isFunctionType()) { 828 Diag(Loc, diag::err_func_returning_array_function) 829 << T->isFunctionType() << T; 830 return QualType(); 831 } 832 833 bool Invalid = false; 834 for (unsigned Idx = 0; Idx < NumParamTypes; ++Idx) { 835 QualType ParamType = adjustParameterType(ParamTypes[Idx]); 836 if (ParamType->isVoidType()) { 837 Diag(Loc, diag::err_param_with_void_type); 838 Invalid = true; 839 } 840 841 ParamTypes[Idx] = ParamType; 842 } 843 844 if (Invalid) 845 return QualType(); 846 847 return Context.getFunctionType(T, ParamTypes, NumParamTypes, Variadic, 848 Quals, false, false, 0, 0, Info); 849} 850 851/// \brief Build a member pointer type \c T Class::*. 852/// 853/// \param T the type to which the member pointer refers. 854/// \param Class the class type into which the member pointer points. 855/// \param CVR Qualifiers applied to the member pointer type 856/// \param Loc the location where this type begins 857/// \param Entity the name of the entity that will have this member pointer type 858/// 859/// \returns a member pointer type, if successful, or a NULL type if there was 860/// an error. 861QualType Sema::BuildMemberPointerType(QualType T, QualType Class, 862 SourceLocation Loc, 863 DeclarationName Entity) { 864 // Verify that we're not building a pointer to pointer to function with 865 // exception specification. 866 if (CheckDistantExceptionSpec(T)) { 867 Diag(Loc, diag::err_distant_exception_spec); 868 869 // FIXME: If we're doing this as part of template instantiation, 870 // we should return immediately. 871 872 // Build the type anyway, but use the canonical type so that the 873 // exception specifiers are stripped off. 874 T = Context.getCanonicalType(T); 875 } 876 877 // C++ 8.3.3p3: A pointer to member shall not point to ... a member 878 // with reference type, or "cv void." 879 if (T->isReferenceType()) { 880 Diag(Loc, diag::err_illegal_decl_mempointer_to_reference) 881 << (Entity? Entity.getAsString() : "type name") << T; 882 return QualType(); 883 } 884 885 if (T->isVoidType()) { 886 Diag(Loc, diag::err_illegal_decl_mempointer_to_void) 887 << (Entity? Entity.getAsString() : "type name"); 888 return QualType(); 889 } 890 891 if (!Class->isDependentType() && !Class->isRecordType()) { 892 Diag(Loc, diag::err_mempointer_in_nonclass_type) << Class; 893 return QualType(); 894 } 895 896 // In the Microsoft ABI, the class is allowed to be an incomplete 897 // type. In such cases, the compiler makes a worst-case assumption. 898 // We make no such assumption right now, so emit an error if the 899 // class isn't a complete type. 900 if (Context.Target.getCXXABI() == CXXABI_Microsoft && 901 RequireCompleteType(Loc, Class, diag::err_incomplete_type)) 902 return QualType(); 903 904 return Context.getMemberPointerType(T, Class.getTypePtr()); 905} 906 907/// \brief Build a block pointer type. 908/// 909/// \param T The type to which we'll be building a block pointer. 910/// 911/// \param CVR The cvr-qualifiers to be applied to the block pointer type. 912/// 913/// \param Loc The location of the entity whose type involves this 914/// block pointer type or, if there is no such entity, the location of the 915/// type that will have block pointer type. 916/// 917/// \param Entity The name of the entity that involves the block pointer 918/// type, if known. 919/// 920/// \returns A suitable block pointer type, if there are no 921/// errors. Otherwise, returns a NULL type. 922QualType Sema::BuildBlockPointerType(QualType T, 923 SourceLocation Loc, 924 DeclarationName Entity) { 925 if (!T->isFunctionType()) { 926 Diag(Loc, diag::err_nonfunction_block_type); 927 return QualType(); 928 } 929 930 return Context.getBlockPointerType(T); 931} 932 933QualType Sema::GetTypeFromParser(TypeTy *Ty, TypeSourceInfo **TInfo) { 934 QualType QT = QualType::getFromOpaquePtr(Ty); 935 if (QT.isNull()) { 936 if (TInfo) *TInfo = 0; 937 return QualType(); 938 } 939 940 TypeSourceInfo *DI = 0; 941 if (LocInfoType *LIT = dyn_cast<LocInfoType>(QT)) { 942 QT = LIT->getType(); 943 DI = LIT->getTypeSourceInfo(); 944 } 945 946 if (TInfo) *TInfo = DI; 947 return QT; 948} 949 950/// GetTypeForDeclarator - Convert the type for the specified 951/// declarator to Type instances. 952/// 953/// If OwnedDecl is non-NULL, and this declarator's decl-specifier-seq 954/// owns the declaration of a type (e.g., the definition of a struct 955/// type), then *OwnedDecl will receive the owned declaration. 956/// 957/// The result of this call will never be null, but the associated 958/// type may be a null type if there's an unrecoverable error. 959TypeSourceInfo *Sema::GetTypeForDeclarator(Declarator &D, Scope *S, 960 TagDecl **OwnedDecl) { 961 // Determine the type of the declarator. Not all forms of declarator 962 // have a type. 963 QualType T; 964 TypeSourceInfo *ReturnTypeInfo = 0; 965 966 llvm::SmallVector<DelayedAttribute,4> FnAttrsFromDeclSpec; 967 968 switch (D.getName().getKind()) { 969 case UnqualifiedId::IK_Identifier: 970 case UnqualifiedId::IK_OperatorFunctionId: 971 case UnqualifiedId::IK_LiteralOperatorId: 972 case UnqualifiedId::IK_TemplateId: 973 T = ConvertDeclSpecToType(*this, D, FnAttrsFromDeclSpec); 974 975 if (!D.isInvalidType() && D.getDeclSpec().isTypeSpecOwned()) { 976 TagDecl* Owned = cast<TagDecl>((Decl *)D.getDeclSpec().getTypeRep()); 977 // Owned is embedded if it was defined here, or if it is the 978 // very first (i.e., canonical) declaration of this tag type. 979 Owned->setEmbeddedInDeclarator(Owned->isDefinition() || 980 Owned->isCanonicalDecl()); 981 if (OwnedDecl) *OwnedDecl = Owned; 982 } 983 break; 984 985 case UnqualifiedId::IK_ConstructorName: 986 case UnqualifiedId::IK_ConstructorTemplateId: 987 case UnqualifiedId::IK_DestructorName: 988 // Constructors and destructors don't have return types. Use 989 // "void" instead. 990 T = Context.VoidTy; 991 break; 992 993 case UnqualifiedId::IK_ConversionFunctionId: 994 // The result type of a conversion function is the type that it 995 // converts to. 996 T = GetTypeFromParser(D.getName().ConversionFunctionId, 997 &ReturnTypeInfo); 998 break; 999 } 1000 1001 if (T.isNull()) 1002 return Context.getNullTypeSourceInfo(); 1003 1004 if (T == Context.UndeducedAutoTy) { 1005 int Error = -1; 1006 1007 switch (D.getContext()) { 1008 case Declarator::KNRTypeListContext: 1009 assert(0 && "K&R type lists aren't allowed in C++"); 1010 break; 1011 case Declarator::PrototypeContext: 1012 Error = 0; // Function prototype 1013 break; 1014 case Declarator::MemberContext: 1015 switch (cast<TagDecl>(CurContext)->getTagKind()) { 1016 case TTK_Enum: assert(0 && "unhandled tag kind"); break; 1017 case TTK_Struct: Error = 1; /* Struct member */ break; 1018 case TTK_Union: Error = 2; /* Union member */ break; 1019 case TTK_Class: Error = 3; /* Class member */ break; 1020 } 1021 break; 1022 case Declarator::CXXCatchContext: 1023 Error = 4; // Exception declaration 1024 break; 1025 case Declarator::TemplateParamContext: 1026 Error = 5; // Template parameter 1027 break; 1028 case Declarator::BlockLiteralContext: 1029 Error = 6; // Block literal 1030 break; 1031 case Declarator::FileContext: 1032 case Declarator::BlockContext: 1033 case Declarator::ForContext: 1034 case Declarator::ConditionContext: 1035 case Declarator::TypeNameContext: 1036 break; 1037 } 1038 1039 if (Error != -1) { 1040 Diag(D.getDeclSpec().getTypeSpecTypeLoc(), diag::err_auto_not_allowed) 1041 << Error; 1042 T = Context.IntTy; 1043 D.setInvalidType(true); 1044 } 1045 } 1046 1047 // The name we're declaring, if any. 1048 DeclarationName Name; 1049 if (D.getIdentifier()) 1050 Name = D.getIdentifier(); 1051 1052 llvm::SmallVector<DelayedAttribute,4> FnAttrsFromPreviousChunk; 1053 1054 // Walk the DeclTypeInfo, building the recursive type as we go. 1055 // DeclTypeInfos are ordered from the identifier out, which is 1056 // opposite of what we want :). 1057 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 1058 DeclaratorChunk &DeclType = D.getTypeObject(e-i-1); 1059 switch (DeclType.Kind) { 1060 default: assert(0 && "Unknown decltype!"); 1061 case DeclaratorChunk::BlockPointer: 1062 // If blocks are disabled, emit an error. 1063 if (!LangOpts.Blocks) 1064 Diag(DeclType.Loc, diag::err_blocks_disable); 1065 1066 T = BuildBlockPointerType(T, D.getIdentifierLoc(), Name); 1067 if (DeclType.Cls.TypeQuals) 1068 T = BuildQualifiedType(T, DeclType.Loc, DeclType.Cls.TypeQuals); 1069 break; 1070 case DeclaratorChunk::Pointer: 1071 // Verify that we're not building a pointer to pointer to function with 1072 // exception specification. 1073 if (getLangOptions().CPlusPlus && CheckDistantExceptionSpec(T)) { 1074 Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 1075 D.setInvalidType(true); 1076 // Build the type anyway. 1077 } 1078 if (getLangOptions().ObjC1 && T->getAs<ObjCObjectType>()) { 1079 T = Context.getObjCObjectPointerType(T); 1080 if (DeclType.Ptr.TypeQuals) 1081 T = BuildQualifiedType(T, DeclType.Loc, DeclType.Ptr.TypeQuals); 1082 break; 1083 } 1084 T = BuildPointerType(T, DeclType.Loc, Name); 1085 if (DeclType.Ptr.TypeQuals) 1086 T = BuildQualifiedType(T, DeclType.Loc, DeclType.Ptr.TypeQuals); 1087 break; 1088 case DeclaratorChunk::Reference: { 1089 // Verify that we're not building a reference to pointer to function with 1090 // exception specification. 1091 if (getLangOptions().CPlusPlus && CheckDistantExceptionSpec(T)) { 1092 Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 1093 D.setInvalidType(true); 1094 // Build the type anyway. 1095 } 1096 T = BuildReferenceType(T, DeclType.Ref.LValueRef, DeclType.Loc, Name); 1097 1098 Qualifiers Quals; 1099 if (DeclType.Ref.HasRestrict) 1100 T = BuildQualifiedType(T, DeclType.Loc, Qualifiers::Restrict); 1101 break; 1102 } 1103 case DeclaratorChunk::Array: { 1104 // Verify that we're not building an array of pointers to function with 1105 // exception specification. 1106 if (getLangOptions().CPlusPlus && CheckDistantExceptionSpec(T)) { 1107 Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 1108 D.setInvalidType(true); 1109 // Build the type anyway. 1110 } 1111 DeclaratorChunk::ArrayTypeInfo &ATI = DeclType.Arr; 1112 Expr *ArraySize = static_cast<Expr*>(ATI.NumElts); 1113 ArrayType::ArraySizeModifier ASM; 1114 if (ATI.isStar) 1115 ASM = ArrayType::Star; 1116 else if (ATI.hasStatic) 1117 ASM = ArrayType::Static; 1118 else 1119 ASM = ArrayType::Normal; 1120 if (ASM == ArrayType::Star && 1121 D.getContext() != Declarator::PrototypeContext) { 1122 // FIXME: This check isn't quite right: it allows star in prototypes 1123 // for function definitions, and disallows some edge cases detailed 1124 // in http://gcc.gnu.org/ml/gcc-patches/2009-02/msg00133.html 1125 Diag(DeclType.Loc, diag::err_array_star_outside_prototype); 1126 ASM = ArrayType::Normal; 1127 D.setInvalidType(true); 1128 } 1129 T = BuildArrayType(T, ASM, ArraySize, 1130 Qualifiers::fromCVRMask(ATI.TypeQuals), 1131 SourceRange(DeclType.Loc, DeclType.EndLoc), Name); 1132 break; 1133 } 1134 case DeclaratorChunk::Function: { 1135 // If the function declarator has a prototype (i.e. it is not () and 1136 // does not have a K&R-style identifier list), then the arguments are part 1137 // of the type, otherwise the argument list is (). 1138 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun; 1139 1140 // C99 6.7.5.3p1: The return type may not be a function or array type. 1141 // For conversion functions, we'll diagnose this particular error later. 1142 if ((T->isArrayType() || T->isFunctionType()) && 1143 (D.getName().getKind() != UnqualifiedId::IK_ConversionFunctionId)) { 1144 Diag(DeclType.Loc, diag::err_func_returning_array_function) 1145 << T->isFunctionType() << T; 1146 T = Context.IntTy; 1147 D.setInvalidType(true); 1148 } 1149 1150 // cv-qualifiers on return types are pointless except when the type is a 1151 // class type in C++. 1152 if (T.getCVRQualifiers() && D.getDeclSpec().getTypeQualifiers() && 1153 (!getLangOptions().CPlusPlus || 1154 (!T->isDependentType() && !T->isRecordType()))) { 1155 unsigned Quals = D.getDeclSpec().getTypeQualifiers(); 1156 std::string QualStr; 1157 unsigned NumQuals = 0; 1158 SourceLocation Loc; 1159 if (Quals & Qualifiers::Const) { 1160 Loc = D.getDeclSpec().getConstSpecLoc(); 1161 ++NumQuals; 1162 QualStr = "const"; 1163 } 1164 if (Quals & Qualifiers::Volatile) { 1165 if (NumQuals == 0) { 1166 Loc = D.getDeclSpec().getVolatileSpecLoc(); 1167 QualStr = "volatile"; 1168 } else 1169 QualStr += " volatile"; 1170 ++NumQuals; 1171 } 1172 if (Quals & Qualifiers::Restrict) { 1173 if (NumQuals == 0) { 1174 Loc = D.getDeclSpec().getRestrictSpecLoc(); 1175 QualStr = "restrict"; 1176 } else 1177 QualStr += " restrict"; 1178 ++NumQuals; 1179 } 1180 assert(NumQuals > 0 && "No known qualifiers?"); 1181 1182 SemaDiagnosticBuilder DB = Diag(Loc, diag::warn_qual_return_type); 1183 DB << QualStr << NumQuals; 1184 if (Quals & Qualifiers::Const) 1185 DB << FixItHint::CreateRemoval(D.getDeclSpec().getConstSpecLoc()); 1186 if (Quals & Qualifiers::Volatile) 1187 DB << FixItHint::CreateRemoval(D.getDeclSpec().getVolatileSpecLoc()); 1188 if (Quals & Qualifiers::Restrict) 1189 DB << FixItHint::CreateRemoval(D.getDeclSpec().getRestrictSpecLoc()); 1190 } 1191 1192 if (getLangOptions().CPlusPlus && D.getDeclSpec().isTypeSpecOwned()) { 1193 // C++ [dcl.fct]p6: 1194 // Types shall not be defined in return or parameter types. 1195 TagDecl *Tag = cast<TagDecl>((Decl *)D.getDeclSpec().getTypeRep()); 1196 if (Tag->isDefinition()) 1197 Diag(Tag->getLocation(), diag::err_type_defined_in_result_type) 1198 << Context.getTypeDeclType(Tag); 1199 } 1200 1201 // Exception specs are not allowed in typedefs. Complain, but add it 1202 // anyway. 1203 if (FTI.hasExceptionSpec && 1204 D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 1205 Diag(FTI.getThrowLoc(), diag::err_exception_spec_in_typedef); 1206 1207 if (!FTI.NumArgs && !FTI.isVariadic && !getLangOptions().CPlusPlus) { 1208 // Simple void foo(), where the incoming T is the result type. 1209 T = Context.getFunctionNoProtoType(T); 1210 } else { 1211 // We allow a zero-parameter variadic function in C if the 1212 // function is marked with the "overloadable" attribute. Scan 1213 // for this attribute now. 1214 if (!FTI.NumArgs && FTI.isVariadic && !getLangOptions().CPlusPlus) { 1215 bool Overloadable = false; 1216 for (const AttributeList *Attrs = D.getAttributes(); 1217 Attrs; Attrs = Attrs->getNext()) { 1218 if (Attrs->getKind() == AttributeList::AT_overloadable) { 1219 Overloadable = true; 1220 break; 1221 } 1222 } 1223 1224 if (!Overloadable) 1225 Diag(FTI.getEllipsisLoc(), diag::err_ellipsis_first_arg); 1226 } 1227 1228 if (FTI.NumArgs && FTI.ArgInfo[0].Param == 0) { 1229 // C99 6.7.5.3p3: Reject int(x,y,z) when it's not a function 1230 // definition. 1231 Diag(FTI.ArgInfo[0].IdentLoc, diag::err_ident_list_in_fn_declaration); 1232 D.setInvalidType(true); 1233 break; 1234 } 1235 1236 // Otherwise, we have a function with an argument list that is 1237 // potentially variadic. 1238 llvm::SmallVector<QualType, 16> ArgTys; 1239 ArgTys.reserve(FTI.NumArgs); 1240 1241 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 1242 ParmVarDecl *Param = 1243 cast<ParmVarDecl>(FTI.ArgInfo[i].Param.getAs<Decl>()); 1244 QualType ArgTy = Param->getType(); 1245 assert(!ArgTy.isNull() && "Couldn't parse type?"); 1246 1247 // Adjust the parameter type. 1248 assert((ArgTy == adjustParameterType(ArgTy)) && "Unadjusted type?"); 1249 1250 // Look for 'void'. void is allowed only as a single argument to a 1251 // function with no other parameters (C99 6.7.5.3p10). We record 1252 // int(void) as a FunctionProtoType with an empty argument list. 1253 if (ArgTy->isVoidType()) { 1254 // If this is something like 'float(int, void)', reject it. 'void' 1255 // is an incomplete type (C99 6.2.5p19) and function decls cannot 1256 // have arguments of incomplete type. 1257 if (FTI.NumArgs != 1 || FTI.isVariadic) { 1258 Diag(DeclType.Loc, diag::err_void_only_param); 1259 ArgTy = Context.IntTy; 1260 Param->setType(ArgTy); 1261 } else if (FTI.ArgInfo[i].Ident) { 1262 // Reject, but continue to parse 'int(void abc)'. 1263 Diag(FTI.ArgInfo[i].IdentLoc, 1264 diag::err_param_with_void_type); 1265 ArgTy = Context.IntTy; 1266 Param->setType(ArgTy); 1267 } else { 1268 // Reject, but continue to parse 'float(const void)'. 1269 if (ArgTy.hasQualifiers()) 1270 Diag(DeclType.Loc, diag::err_void_param_qualified); 1271 1272 // Do not add 'void' to the ArgTys list. 1273 break; 1274 } 1275 } else if (!FTI.hasPrototype) { 1276 if (ArgTy->isPromotableIntegerType()) { 1277 ArgTy = Context.getPromotedIntegerType(ArgTy); 1278 } else if (const BuiltinType* BTy = ArgTy->getAs<BuiltinType>()) { 1279 if (BTy->getKind() == BuiltinType::Float) 1280 ArgTy = Context.DoubleTy; 1281 } 1282 } 1283 1284 ArgTys.push_back(ArgTy); 1285 } 1286 1287 llvm::SmallVector<QualType, 4> Exceptions; 1288 Exceptions.reserve(FTI.NumExceptions); 1289 for (unsigned ei = 0, ee = FTI.NumExceptions; ei != ee; ++ei) { 1290 // FIXME: Preserve type source info. 1291 QualType ET = GetTypeFromParser(FTI.Exceptions[ei].Ty); 1292 // Check that the type is valid for an exception spec, and drop it if 1293 // not. 1294 if (!CheckSpecifiedExceptionType(ET, FTI.Exceptions[ei].Range)) 1295 Exceptions.push_back(ET); 1296 } 1297 1298 T = Context.getFunctionType(T, ArgTys.data(), ArgTys.size(), 1299 FTI.isVariadic, FTI.TypeQuals, 1300 FTI.hasExceptionSpec, 1301 FTI.hasAnyExceptionSpec, 1302 Exceptions.size(), Exceptions.data(), 1303 FunctionType::ExtInfo()); 1304 } 1305 1306 // For GCC compatibility, we allow attributes that apply only to 1307 // function types to be placed on a function's return type 1308 // instead (as long as that type doesn't happen to be function 1309 // or function-pointer itself). 1310 ProcessDelayedFnAttrs(*this, T, FnAttrsFromPreviousChunk); 1311 1312 break; 1313 } 1314 case DeclaratorChunk::MemberPointer: 1315 // The scope spec must refer to a class, or be dependent. 1316 CXXScopeSpec &SS = DeclType.Mem.Scope(); 1317 QualType ClsType; 1318 if (SS.isInvalid()) { 1319 // Avoid emitting extra errors if we already errored on the scope. 1320 D.setInvalidType(true); 1321 } else if (isDependentScopeSpecifier(SS) || 1322 dyn_cast_or_null<CXXRecordDecl>(computeDeclContext(SS))) { 1323 NestedNameSpecifier *NNS 1324 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1325 NestedNameSpecifier *NNSPrefix = NNS->getPrefix(); 1326 switch (NNS->getKind()) { 1327 case NestedNameSpecifier::Identifier: 1328 ClsType = Context.getDependentNameType(ETK_None, NNSPrefix, 1329 NNS->getAsIdentifier()); 1330 break; 1331 1332 case NestedNameSpecifier::Namespace: 1333 case NestedNameSpecifier::Global: 1334 llvm_unreachable("Nested-name-specifier must name a type"); 1335 break; 1336 1337 case NestedNameSpecifier::TypeSpec: 1338 case NestedNameSpecifier::TypeSpecWithTemplate: 1339 ClsType = QualType(NNS->getAsType(), 0); 1340 // Note: if NNS is dependent, then its prefix (if any) is already 1341 // included in ClsType; this does not hold if the NNS is 1342 // nondependent: in this case (if there is indeed a prefix) 1343 // ClsType needs to be wrapped into an elaborated type. 1344 if (NNSPrefix && !NNS->isDependent()) 1345 ClsType = Context.getElaboratedType(ETK_None, NNSPrefix, ClsType); 1346 break; 1347 } 1348 } else { 1349 Diag(DeclType.Mem.Scope().getBeginLoc(), 1350 diag::err_illegal_decl_mempointer_in_nonclass) 1351 << (D.getIdentifier() ? D.getIdentifier()->getName() : "type name") 1352 << DeclType.Mem.Scope().getRange(); 1353 D.setInvalidType(true); 1354 } 1355 1356 if (!ClsType.isNull()) 1357 T = BuildMemberPointerType(T, ClsType, DeclType.Loc, D.getIdentifier()); 1358 if (T.isNull()) { 1359 T = Context.IntTy; 1360 D.setInvalidType(true); 1361 } else if (DeclType.Mem.TypeQuals) { 1362 T = BuildQualifiedType(T, DeclType.Loc, DeclType.Mem.TypeQuals); 1363 } 1364 break; 1365 } 1366 1367 if (T.isNull()) { 1368 D.setInvalidType(true); 1369 T = Context.IntTy; 1370 } 1371 1372 DiagnoseDelayedFnAttrs(*this, FnAttrsFromPreviousChunk); 1373 1374 // See if there are any attributes on this declarator chunk. 1375 if (const AttributeList *AL = DeclType.getAttrs()) 1376 ProcessTypeAttributeList(*this, T, false, AL, FnAttrsFromPreviousChunk); 1377 } 1378 1379 if (getLangOptions().CPlusPlus && T->isFunctionType()) { 1380 const FunctionProtoType *FnTy = T->getAs<FunctionProtoType>(); 1381 assert(FnTy && "Why oh why is there not a FunctionProtoType here?"); 1382 1383 // C++ 8.3.5p4: A cv-qualifier-seq shall only be part of the function type 1384 // for a nonstatic member function, the function type to which a pointer 1385 // to member refers, or the top-level function type of a function typedef 1386 // declaration. 1387 bool FreeFunction = (D.getContext() != Declarator::MemberContext && 1388 (!D.getCXXScopeSpec().isSet() || 1389 !computeDeclContext(D.getCXXScopeSpec(), /*FIXME:*/true)->isRecord())); 1390 if (FnTy->getTypeQuals() != 0 && 1391 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 1392 (FreeFunction || 1393 D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_static)) { 1394 if (D.isFunctionDeclarator()) 1395 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_function_type); 1396 else 1397 Diag(D.getIdentifierLoc(), 1398 diag::err_invalid_qualified_typedef_function_type_use) 1399 << FreeFunction; 1400 1401 // Strip the cv-quals from the type. 1402 T = Context.getFunctionType(FnTy->getResultType(), FnTy->arg_type_begin(), 1403 FnTy->getNumArgs(), FnTy->isVariadic(), 0, 1404 false, false, 0, 0, FunctionType::ExtInfo()); 1405 } 1406 } 1407 1408 // If there's a constexpr specifier, treat it as a top-level const. 1409 if (D.getDeclSpec().isConstexprSpecified()) { 1410 T.addConst(); 1411 } 1412 1413 // Process any function attributes we might have delayed from the 1414 // declaration-specifiers. 1415 ProcessDelayedFnAttrs(*this, T, FnAttrsFromDeclSpec); 1416 1417 // If there were any type attributes applied to the decl itself, not 1418 // the type, apply them to the result type. But don't do this for 1419 // block-literal expressions, which are parsed wierdly. 1420 if (D.getContext() != Declarator::BlockLiteralContext) 1421 if (const AttributeList *Attrs = D.getAttributes()) 1422 ProcessTypeAttributeList(*this, T, false, Attrs, 1423 FnAttrsFromPreviousChunk); 1424 1425 DiagnoseDelayedFnAttrs(*this, FnAttrsFromPreviousChunk); 1426 1427 if (T.isNull()) 1428 return Context.getNullTypeSourceInfo(); 1429 else if (D.isInvalidType()) 1430 return Context.getTrivialTypeSourceInfo(T); 1431 return GetTypeSourceInfoForDeclarator(D, T, ReturnTypeInfo); 1432} 1433 1434namespace { 1435 class TypeSpecLocFiller : public TypeLocVisitor<TypeSpecLocFiller> { 1436 const DeclSpec &DS; 1437 1438 public: 1439 TypeSpecLocFiller(const DeclSpec &DS) : DS(DS) {} 1440 1441 void VisitQualifiedTypeLoc(QualifiedTypeLoc TL) { 1442 Visit(TL.getUnqualifiedLoc()); 1443 } 1444 void VisitTypedefTypeLoc(TypedefTypeLoc TL) { 1445 TL.setNameLoc(DS.getTypeSpecTypeLoc()); 1446 } 1447 void VisitObjCInterfaceTypeLoc(ObjCInterfaceTypeLoc TL) { 1448 TL.setNameLoc(DS.getTypeSpecTypeLoc()); 1449 } 1450 void VisitObjCObjectTypeLoc(ObjCObjectTypeLoc TL) { 1451 // Handle the base type, which might not have been written explicitly. 1452 if (DS.getTypeSpecType() == DeclSpec::TST_unspecified) { 1453 TL.setHasBaseTypeAsWritten(false); 1454 TL.getBaseLoc().initialize(SourceLocation()); 1455 } else { 1456 TL.setHasBaseTypeAsWritten(true); 1457 Visit(TL.getBaseLoc()); 1458 } 1459 1460 // Protocol qualifiers. 1461 if (DS.getProtocolQualifiers()) { 1462 assert(TL.getNumProtocols() > 0); 1463 assert(TL.getNumProtocols() == DS.getNumProtocolQualifiers()); 1464 TL.setLAngleLoc(DS.getProtocolLAngleLoc()); 1465 TL.setRAngleLoc(DS.getSourceRange().getEnd()); 1466 for (unsigned i = 0, e = DS.getNumProtocolQualifiers(); i != e; ++i) 1467 TL.setProtocolLoc(i, DS.getProtocolLocs()[i]); 1468 } else { 1469 assert(TL.getNumProtocols() == 0); 1470 TL.setLAngleLoc(SourceLocation()); 1471 TL.setRAngleLoc(SourceLocation()); 1472 } 1473 } 1474 void VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL) { 1475 TL.setStarLoc(SourceLocation()); 1476 Visit(TL.getPointeeLoc()); 1477 } 1478 void VisitTemplateSpecializationTypeLoc(TemplateSpecializationTypeLoc TL) { 1479 TypeSourceInfo *TInfo = 0; 1480 Sema::GetTypeFromParser(DS.getTypeRep(), &TInfo); 1481 1482 // If we got no declarator info from previous Sema routines, 1483 // just fill with the typespec loc. 1484 if (!TInfo) { 1485 TL.initialize(DS.getTypeSpecTypeLoc()); 1486 return; 1487 } 1488 1489 TypeLoc OldTL = TInfo->getTypeLoc(); 1490 if (TInfo->getType()->getAs<ElaboratedType>()) { 1491 ElaboratedTypeLoc ElabTL = cast<ElaboratedTypeLoc>(OldTL); 1492 TemplateSpecializationTypeLoc NamedTL = 1493 cast<TemplateSpecializationTypeLoc>(ElabTL.getNamedTypeLoc()); 1494 TL.copy(NamedTL); 1495 } 1496 else 1497 TL.copy(cast<TemplateSpecializationTypeLoc>(OldTL)); 1498 } 1499 void VisitTypeOfExprTypeLoc(TypeOfExprTypeLoc TL) { 1500 assert(DS.getTypeSpecType() == DeclSpec::TST_typeofExpr); 1501 TL.setTypeofLoc(DS.getTypeSpecTypeLoc()); 1502 TL.setParensRange(DS.getTypeofParensRange()); 1503 } 1504 void VisitTypeOfTypeLoc(TypeOfTypeLoc TL) { 1505 assert(DS.getTypeSpecType() == DeclSpec::TST_typeofType); 1506 TL.setTypeofLoc(DS.getTypeSpecTypeLoc()); 1507 TL.setParensRange(DS.getTypeofParensRange()); 1508 assert(DS.getTypeRep()); 1509 TypeSourceInfo *TInfo = 0; 1510 Sema::GetTypeFromParser(DS.getTypeRep(), &TInfo); 1511 TL.setUnderlyingTInfo(TInfo); 1512 } 1513 void VisitBuiltinTypeLoc(BuiltinTypeLoc TL) { 1514 // By default, use the source location of the type specifier. 1515 TL.setBuiltinLoc(DS.getTypeSpecTypeLoc()); 1516 if (TL.needsExtraLocalData()) { 1517 // Set info for the written builtin specifiers. 1518 TL.getWrittenBuiltinSpecs() = DS.getWrittenBuiltinSpecs(); 1519 // Try to have a meaningful source location. 1520 if (TL.getWrittenSignSpec() != TSS_unspecified) 1521 // Sign spec loc overrides the others (e.g., 'unsigned long'). 1522 TL.setBuiltinLoc(DS.getTypeSpecSignLoc()); 1523 else if (TL.getWrittenWidthSpec() != TSW_unspecified) 1524 // Width spec loc overrides type spec loc (e.g., 'short int'). 1525 TL.setBuiltinLoc(DS.getTypeSpecWidthLoc()); 1526 } 1527 } 1528 void VisitElaboratedTypeLoc(ElaboratedTypeLoc TL) { 1529 ElaboratedTypeKeyword Keyword 1530 = TypeWithKeyword::getKeywordForTypeSpec(DS.getTypeSpecType()); 1531 if (Keyword == ETK_Typename) { 1532 TypeSourceInfo *TInfo = 0; 1533 Sema::GetTypeFromParser(DS.getTypeRep(), &TInfo); 1534 if (TInfo) { 1535 TL.copy(cast<ElaboratedTypeLoc>(TInfo->getTypeLoc())); 1536 return; 1537 } 1538 } 1539 TL.setKeywordLoc(Keyword != ETK_None 1540 ? DS.getTypeSpecTypeLoc() 1541 : SourceLocation()); 1542 const CXXScopeSpec& SS = DS.getTypeSpecScope(); 1543 TL.setQualifierRange(SS.isEmpty() ? SourceRange(): SS.getRange()); 1544 Visit(TL.getNextTypeLoc().getUnqualifiedLoc()); 1545 } 1546 void VisitDependentNameTypeLoc(DependentNameTypeLoc TL) { 1547 ElaboratedTypeKeyword Keyword 1548 = TypeWithKeyword::getKeywordForTypeSpec(DS.getTypeSpecType()); 1549 if (Keyword == ETK_Typename) { 1550 TypeSourceInfo *TInfo = 0; 1551 Sema::GetTypeFromParser(DS.getTypeRep(), &TInfo); 1552 if (TInfo) { 1553 TL.copy(cast<DependentNameTypeLoc>(TInfo->getTypeLoc())); 1554 return; 1555 } 1556 } 1557 TL.setKeywordLoc(Keyword != ETK_None 1558 ? DS.getTypeSpecTypeLoc() 1559 : SourceLocation()); 1560 const CXXScopeSpec& SS = DS.getTypeSpecScope(); 1561 TL.setQualifierRange(SS.isEmpty() ? SourceRange() : SS.getRange()); 1562 // FIXME: load appropriate source location. 1563 TL.setNameLoc(DS.getTypeSpecTypeLoc()); 1564 } 1565 void VisitDependentTemplateSpecializationTypeLoc( 1566 DependentTemplateSpecializationTypeLoc TL) { 1567 ElaboratedTypeKeyword Keyword 1568 = TypeWithKeyword::getKeywordForTypeSpec(DS.getTypeSpecType()); 1569 if (Keyword == ETK_Typename) { 1570 TypeSourceInfo *TInfo = 0; 1571 Sema::GetTypeFromParser(DS.getTypeRep(), &TInfo); 1572 if (TInfo) { 1573 TL.copy(cast<DependentTemplateSpecializationTypeLoc>( 1574 TInfo->getTypeLoc())); 1575 return; 1576 } 1577 } 1578 TL.initializeLocal(SourceLocation()); 1579 TL.setKeywordLoc(Keyword != ETK_None 1580 ? DS.getTypeSpecTypeLoc() 1581 : SourceLocation()); 1582 const CXXScopeSpec& SS = DS.getTypeSpecScope(); 1583 TL.setQualifierRange(SS.isEmpty() ? SourceRange() : SS.getRange()); 1584 // FIXME: load appropriate source location. 1585 TL.setNameLoc(DS.getTypeSpecTypeLoc()); 1586 } 1587 1588 void VisitTypeLoc(TypeLoc TL) { 1589 // FIXME: add other typespec types and change this to an assert. 1590 TL.initialize(DS.getTypeSpecTypeLoc()); 1591 } 1592 }; 1593 1594 class DeclaratorLocFiller : public TypeLocVisitor<DeclaratorLocFiller> { 1595 const DeclaratorChunk &Chunk; 1596 1597 public: 1598 DeclaratorLocFiller(const DeclaratorChunk &Chunk) : Chunk(Chunk) {} 1599 1600 void VisitQualifiedTypeLoc(QualifiedTypeLoc TL) { 1601 llvm_unreachable("qualified type locs not expected here!"); 1602 } 1603 1604 void VisitBlockPointerTypeLoc(BlockPointerTypeLoc TL) { 1605 assert(Chunk.Kind == DeclaratorChunk::BlockPointer); 1606 TL.setCaretLoc(Chunk.Loc); 1607 } 1608 void VisitPointerTypeLoc(PointerTypeLoc TL) { 1609 assert(Chunk.Kind == DeclaratorChunk::Pointer); 1610 TL.setStarLoc(Chunk.Loc); 1611 } 1612 void VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL) { 1613 assert(Chunk.Kind == DeclaratorChunk::Pointer); 1614 TL.setStarLoc(Chunk.Loc); 1615 } 1616 void VisitMemberPointerTypeLoc(MemberPointerTypeLoc TL) { 1617 assert(Chunk.Kind == DeclaratorChunk::MemberPointer); 1618 TL.setStarLoc(Chunk.Loc); 1619 // FIXME: nested name specifier 1620 } 1621 void VisitLValueReferenceTypeLoc(LValueReferenceTypeLoc TL) { 1622 assert(Chunk.Kind == DeclaratorChunk::Reference); 1623 // 'Amp' is misleading: this might have been originally 1624 /// spelled with AmpAmp. 1625 TL.setAmpLoc(Chunk.Loc); 1626 } 1627 void VisitRValueReferenceTypeLoc(RValueReferenceTypeLoc TL) { 1628 assert(Chunk.Kind == DeclaratorChunk::Reference); 1629 assert(!Chunk.Ref.LValueRef); 1630 TL.setAmpAmpLoc(Chunk.Loc); 1631 } 1632 void VisitArrayTypeLoc(ArrayTypeLoc TL) { 1633 assert(Chunk.Kind == DeclaratorChunk::Array); 1634 TL.setLBracketLoc(Chunk.Loc); 1635 TL.setRBracketLoc(Chunk.EndLoc); 1636 TL.setSizeExpr(static_cast<Expr*>(Chunk.Arr.NumElts)); 1637 } 1638 void VisitFunctionTypeLoc(FunctionTypeLoc TL) { 1639 assert(Chunk.Kind == DeclaratorChunk::Function); 1640 TL.setLParenLoc(Chunk.Loc); 1641 TL.setRParenLoc(Chunk.EndLoc); 1642 1643 const DeclaratorChunk::FunctionTypeInfo &FTI = Chunk.Fun; 1644 for (unsigned i = 0, e = TL.getNumArgs(), tpi = 0; i != e; ++i) { 1645 ParmVarDecl *Param = FTI.ArgInfo[i].Param.getAs<ParmVarDecl>(); 1646 TL.setArg(tpi++, Param); 1647 } 1648 // FIXME: exception specs 1649 } 1650 1651 void VisitTypeLoc(TypeLoc TL) { 1652 llvm_unreachable("unsupported TypeLoc kind in declarator!"); 1653 } 1654 }; 1655} 1656 1657/// \brief Create and instantiate a TypeSourceInfo with type source information. 1658/// 1659/// \param T QualType referring to the type as written in source code. 1660/// 1661/// \param ReturnTypeInfo For declarators whose return type does not show 1662/// up in the normal place in the declaration specifiers (such as a C++ 1663/// conversion function), this pointer will refer to a type source information 1664/// for that return type. 1665TypeSourceInfo * 1666Sema::GetTypeSourceInfoForDeclarator(Declarator &D, QualType T, 1667 TypeSourceInfo *ReturnTypeInfo) { 1668 TypeSourceInfo *TInfo = Context.CreateTypeSourceInfo(T); 1669 UnqualTypeLoc CurrTL = TInfo->getTypeLoc().getUnqualifiedLoc(); 1670 1671 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 1672 DeclaratorLocFiller(D.getTypeObject(i)).Visit(CurrTL); 1673 CurrTL = CurrTL.getNextTypeLoc().getUnqualifiedLoc(); 1674 } 1675 1676 TypeSpecLocFiller(D.getDeclSpec()).Visit(CurrTL); 1677 1678 // We have source information for the return type that was not in the 1679 // declaration specifiers; copy that information into the current type 1680 // location so that it will be retained. This occurs, for example, with 1681 // a C++ conversion function, where the return type occurs within the 1682 // declarator-id rather than in the declaration specifiers. 1683 if (ReturnTypeInfo && D.getDeclSpec().getTypeSpecType() == TST_unspecified) { 1684 TypeLoc TL = ReturnTypeInfo->getTypeLoc(); 1685 assert(TL.getFullDataSize() == CurrTL.getFullDataSize()); 1686 memcpy(CurrTL.getOpaqueData(), TL.getOpaqueData(), TL.getFullDataSize()); 1687 } 1688 1689 return TInfo; 1690} 1691 1692/// \brief Create a LocInfoType to hold the given QualType and TypeSourceInfo. 1693QualType Sema::CreateLocInfoType(QualType T, TypeSourceInfo *TInfo) { 1694 // FIXME: LocInfoTypes are "transient", only needed for passing to/from Parser 1695 // and Sema during declaration parsing. Try deallocating/caching them when 1696 // it's appropriate, instead of allocating them and keeping them around. 1697 LocInfoType *LocT = (LocInfoType*)BumpAlloc.Allocate(sizeof(LocInfoType), 8); 1698 new (LocT) LocInfoType(T, TInfo); 1699 assert(LocT->getTypeClass() != T->getTypeClass() && 1700 "LocInfoType's TypeClass conflicts with an existing Type class"); 1701 return QualType(LocT, 0); 1702} 1703 1704void LocInfoType::getAsStringInternal(std::string &Str, 1705 const PrintingPolicy &Policy) const { 1706 assert(false && "LocInfoType leaked into the type system; an opaque TypeTy*" 1707 " was used directly instead of getting the QualType through" 1708 " GetTypeFromParser"); 1709} 1710 1711Sema::TypeResult Sema::ActOnTypeName(Scope *S, Declarator &D) { 1712 // C99 6.7.6: Type names have no identifier. This is already validated by 1713 // the parser. 1714 assert(D.getIdentifier() == 0 && "Type name should have no identifier!"); 1715 1716 TagDecl *OwnedTag = 0; 1717 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S, &OwnedTag); 1718 QualType T = TInfo->getType(); 1719 if (D.isInvalidType()) 1720 return true; 1721 1722 if (getLangOptions().CPlusPlus) { 1723 // Check that there are no default arguments (C++ only). 1724 CheckExtraCXXDefaultArguments(D); 1725 1726 // C++0x [dcl.type]p3: 1727 // A type-specifier-seq shall not define a class or enumeration 1728 // unless it appears in the type-id of an alias-declaration 1729 // (7.1.3). 1730 if (OwnedTag && OwnedTag->isDefinition()) 1731 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_type_specifier) 1732 << Context.getTypeDeclType(OwnedTag); 1733 } 1734 1735 T = CreateLocInfoType(T, TInfo); 1736 return T.getAsOpaquePtr(); 1737} 1738 1739 1740 1741//===----------------------------------------------------------------------===// 1742// Type Attribute Processing 1743//===----------------------------------------------------------------------===// 1744 1745/// HandleAddressSpaceTypeAttribute - Process an address_space attribute on the 1746/// specified type. The attribute contains 1 argument, the id of the address 1747/// space for the type. 1748static void HandleAddressSpaceTypeAttribute(QualType &Type, 1749 const AttributeList &Attr, Sema &S){ 1750 1751 // If this type is already address space qualified, reject it. 1752 // Clause 6.7.3 - Type qualifiers: "No type shall be qualified by qualifiers 1753 // for two or more different address spaces." 1754 if (Type.getAddressSpace()) { 1755 S.Diag(Attr.getLoc(), diag::err_attribute_address_multiple_qualifiers); 1756 Attr.setInvalid(); 1757 return; 1758 } 1759 1760 // Check the attribute arguments. 1761 if (Attr.getNumArgs() != 1) { 1762 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 1763 Attr.setInvalid(); 1764 return; 1765 } 1766 Expr *ASArgExpr = static_cast<Expr *>(Attr.getArg(0)); 1767 llvm::APSInt addrSpace(32); 1768 if (ASArgExpr->isTypeDependent() || ASArgExpr->isValueDependent() || 1769 !ASArgExpr->isIntegerConstantExpr(addrSpace, S.Context)) { 1770 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_not_int) 1771 << ASArgExpr->getSourceRange(); 1772 Attr.setInvalid(); 1773 return; 1774 } 1775 1776 // Bounds checking. 1777 if (addrSpace.isSigned()) { 1778 if (addrSpace.isNegative()) { 1779 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_negative) 1780 << ASArgExpr->getSourceRange(); 1781 Attr.setInvalid(); 1782 return; 1783 } 1784 addrSpace.setIsSigned(false); 1785 } 1786 llvm::APSInt max(addrSpace.getBitWidth()); 1787 max = Qualifiers::MaxAddressSpace; 1788 if (addrSpace > max) { 1789 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_too_high) 1790 << Qualifiers::MaxAddressSpace << ASArgExpr->getSourceRange(); 1791 Attr.setInvalid(); 1792 return; 1793 } 1794 1795 unsigned ASIdx = static_cast<unsigned>(addrSpace.getZExtValue()); 1796 Type = S.Context.getAddrSpaceQualType(Type, ASIdx); 1797} 1798 1799/// HandleObjCGCTypeAttribute - Process an objc's gc attribute on the 1800/// specified type. The attribute contains 1 argument, weak or strong. 1801static void HandleObjCGCTypeAttribute(QualType &Type, 1802 const AttributeList &Attr, Sema &S) { 1803 if (Type.getObjCGCAttr() != Qualifiers::GCNone) { 1804 S.Diag(Attr.getLoc(), diag::err_attribute_multiple_objc_gc); 1805 Attr.setInvalid(); 1806 return; 1807 } 1808 1809 // Check the attribute arguments. 1810 if (!Attr.getParameterName()) { 1811 S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_string) 1812 << "objc_gc" << 1; 1813 Attr.setInvalid(); 1814 return; 1815 } 1816 Qualifiers::GC GCAttr; 1817 if (Attr.getNumArgs() != 0) { 1818 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 1819 Attr.setInvalid(); 1820 return; 1821 } 1822 if (Attr.getParameterName()->isStr("weak")) 1823 GCAttr = Qualifiers::Weak; 1824 else if (Attr.getParameterName()->isStr("strong")) 1825 GCAttr = Qualifiers::Strong; 1826 else { 1827 S.Diag(Attr.getLoc(), diag::warn_attribute_type_not_supported) 1828 << "objc_gc" << Attr.getParameterName(); 1829 Attr.setInvalid(); 1830 return; 1831 } 1832 1833 Type = S.Context.getObjCGCQualType(Type, GCAttr); 1834} 1835 1836static QualType GetResultType(QualType T) { 1837 if (const PointerType *PT = T->getAs<PointerType>()) 1838 T = PT->getPointeeType(); 1839 else if (const BlockPointerType *BT = T->getAs<BlockPointerType>()) 1840 T = BT->getPointeeType(); 1841 return T->getAs<FunctionType>()->getResultType(); 1842} 1843 1844/// Process an individual function attribute. Returns true if the 1845/// attribute does not make sense to apply to this type. 1846bool ProcessFnAttr(Sema &S, QualType &Type, const AttributeList &Attr) { 1847 if (Attr.getKind() == AttributeList::AT_noreturn) { 1848 // Complain immediately if the arg count is wrong. 1849 if (Attr.getNumArgs() != 0) { 1850 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0; 1851 Attr.setInvalid(); 1852 return false; 1853 } 1854 1855 // Delay if this is not a function or pointer to block. 1856 if (!Type->isFunctionPointerType() 1857 && !Type->isBlockPointerType() 1858 && !Type->isFunctionType()) 1859 return true; 1860 1861 if (!GetResultType(Type)->isVoidType()) { 1862 S.Diag(Attr.getLoc(), diag::warn_noreturn_function_has_nonvoid_result) 1863 << (Type->isBlockPointerType() ? /* blocks */ 1 : /* functions */ 0); 1864 } 1865 1866 // Otherwise we can process right away. 1867 Type = S.Context.getNoReturnType(Type); 1868 return false; 1869 } 1870 1871 if (Attr.getKind() == AttributeList::AT_regparm) { 1872 // The warning is emitted elsewhere 1873 if (Attr.getNumArgs() != 1) { 1874 return false; 1875 } 1876 1877 // Delay if this is not a function or pointer to block. 1878 if (!Type->isFunctionPointerType() 1879 && !Type->isBlockPointerType() 1880 && !Type->isFunctionType()) 1881 return true; 1882 1883 // Otherwise we can process right away. 1884 Expr *NumParamsExpr = static_cast<Expr *>(Attr.getArg(0)); 1885 llvm::APSInt NumParams(32); 1886 1887 // The warning is emitted elsewhere 1888 if (NumParamsExpr->isTypeDependent() || NumParamsExpr->isValueDependent() || 1889 !NumParamsExpr->isIntegerConstantExpr(NumParams, S.Context)) 1890 return false; 1891 1892 Type = S.Context.getRegParmType(Type, NumParams.getZExtValue()); 1893 return false; 1894 } 1895 1896 // Otherwise, a calling convention. 1897 if (Attr.getNumArgs() != 0) { 1898 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0; 1899 Attr.setInvalid(); 1900 return false; 1901 } 1902 1903 QualType T = Type; 1904 if (const PointerType *PT = Type->getAs<PointerType>()) 1905 T = PT->getPointeeType(); 1906 const FunctionType *Fn = T->getAs<FunctionType>(); 1907 1908 // Delay if the type didn't work out to a function. 1909 if (!Fn) return true; 1910 1911 // TODO: diagnose uses of these conventions on the wrong target. 1912 CallingConv CC; 1913 switch (Attr.getKind()) { 1914 case AttributeList::AT_cdecl: CC = CC_C; break; 1915 case AttributeList::AT_fastcall: CC = CC_X86FastCall; break; 1916 case AttributeList::AT_stdcall: CC = CC_X86StdCall; break; 1917 case AttributeList::AT_thiscall: CC = CC_X86ThisCall; break; 1918 default: llvm_unreachable("unexpected attribute kind"); return false; 1919 } 1920 1921 CallingConv CCOld = Fn->getCallConv(); 1922 if (S.Context.getCanonicalCallConv(CC) == 1923 S.Context.getCanonicalCallConv(CCOld)) { 1924 Attr.setInvalid(); 1925 return false; 1926 } 1927 1928 if (CCOld != CC_Default) { 1929 // Should we diagnose reapplications of the same convention? 1930 S.Diag(Attr.getLoc(), diag::err_attributes_are_not_compatible) 1931 << FunctionType::getNameForCallConv(CC) 1932 << FunctionType::getNameForCallConv(CCOld); 1933 Attr.setInvalid(); 1934 return false; 1935 } 1936 1937 // Diagnose the use of X86 fastcall on varargs or unprototyped functions. 1938 if (CC == CC_X86FastCall) { 1939 if (isa<FunctionNoProtoType>(Fn)) { 1940 S.Diag(Attr.getLoc(), diag::err_cconv_knr) 1941 << FunctionType::getNameForCallConv(CC); 1942 Attr.setInvalid(); 1943 return false; 1944 } 1945 1946 const FunctionProtoType *FnP = cast<FunctionProtoType>(Fn); 1947 if (FnP->isVariadic()) { 1948 S.Diag(Attr.getLoc(), diag::err_cconv_varargs) 1949 << FunctionType::getNameForCallConv(CC); 1950 Attr.setInvalid(); 1951 return false; 1952 } 1953 } 1954 1955 Type = S.Context.getCallConvType(Type, CC); 1956 return false; 1957} 1958 1959/// HandleVectorSizeAttribute - this attribute is only applicable to integral 1960/// and float scalars, although arrays, pointers, and function return values are 1961/// allowed in conjunction with this construct. Aggregates with this attribute 1962/// are invalid, even if they are of the same size as a corresponding scalar. 1963/// The raw attribute should contain precisely 1 argument, the vector size for 1964/// the variable, measured in bytes. If curType and rawAttr are well formed, 1965/// this routine will return a new vector type. 1966static void HandleVectorSizeAttr(QualType& CurType, const AttributeList &Attr, 1967 Sema &S) { 1968 // Check the attribute arugments. 1969 if (Attr.getNumArgs() != 1) { 1970 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 1971 Attr.setInvalid(); 1972 return; 1973 } 1974 Expr *sizeExpr = static_cast<Expr *>(Attr.getArg(0)); 1975 llvm::APSInt vecSize(32); 1976 if (sizeExpr->isTypeDependent() || sizeExpr->isValueDependent() || 1977 !sizeExpr->isIntegerConstantExpr(vecSize, S.Context)) { 1978 S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int) 1979 << "vector_size" << sizeExpr->getSourceRange(); 1980 Attr.setInvalid(); 1981 return; 1982 } 1983 // the base type must be integer or float, and can't already be a vector. 1984 if (!CurType->isIntegerType() && !CurType->isRealFloatingType()) { 1985 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_vector_type) << CurType; 1986 Attr.setInvalid(); 1987 return; 1988 } 1989 unsigned typeSize = static_cast<unsigned>(S.Context.getTypeSize(CurType)); 1990 // vecSize is specified in bytes - convert to bits. 1991 unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue() * 8); 1992 1993 // the vector size needs to be an integral multiple of the type size. 1994 if (vectorSize % typeSize) { 1995 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_size) 1996 << sizeExpr->getSourceRange(); 1997 Attr.setInvalid(); 1998 return; 1999 } 2000 if (vectorSize == 0) { 2001 S.Diag(Attr.getLoc(), diag::err_attribute_zero_size) 2002 << sizeExpr->getSourceRange(); 2003 Attr.setInvalid(); 2004 return; 2005 } 2006 2007 // Success! Instantiate the vector type, the number of elements is > 0, and 2008 // not required to be a power of 2, unlike GCC. 2009 CurType = S.Context.getVectorType(CurType, vectorSize/typeSize, 2010 VectorType::NotAltiVec); 2011} 2012 2013void ProcessTypeAttributeList(Sema &S, QualType &Result, 2014 bool IsDeclSpec, const AttributeList *AL, 2015 DelayedAttributeSet &FnAttrs) { 2016 // Scan through and apply attributes to this type where it makes sense. Some 2017 // attributes (such as __address_space__, __vector_size__, etc) apply to the 2018 // type, but others can be present in the type specifiers even though they 2019 // apply to the decl. Here we apply type attributes and ignore the rest. 2020 for (; AL; AL = AL->getNext()) { 2021 // Skip attributes that were marked to be invalid. 2022 if (AL->isInvalid()) 2023 continue; 2024 2025 // If this is an attribute we can handle, do so now, 2026 // otherwise, add it to the FnAttrs list for rechaining. 2027 switch (AL->getKind()) { 2028 default: break; 2029 2030 case AttributeList::AT_address_space: 2031 HandleAddressSpaceTypeAttribute(Result, *AL, S); 2032 break; 2033 case AttributeList::AT_objc_gc: 2034 HandleObjCGCTypeAttribute(Result, *AL, S); 2035 break; 2036 case AttributeList::AT_vector_size: 2037 HandleVectorSizeAttr(Result, *AL, S); 2038 break; 2039 2040 case AttributeList::AT_noreturn: 2041 case AttributeList::AT_cdecl: 2042 case AttributeList::AT_fastcall: 2043 case AttributeList::AT_stdcall: 2044 case AttributeList::AT_thiscall: 2045 case AttributeList::AT_regparm: 2046 // Don't process these on the DeclSpec. 2047 if (IsDeclSpec || 2048 ProcessFnAttr(S, Result, *AL)) 2049 FnAttrs.push_back(DelayedAttribute(AL, Result)); 2050 break; 2051 } 2052 } 2053} 2054 2055/// @brief Ensure that the type T is a complete type. 2056/// 2057/// This routine checks whether the type @p T is complete in any 2058/// context where a complete type is required. If @p T is a complete 2059/// type, returns false. If @p T is a class template specialization, 2060/// this routine then attempts to perform class template 2061/// instantiation. If instantiation fails, or if @p T is incomplete 2062/// and cannot be completed, issues the diagnostic @p diag (giving it 2063/// the type @p T) and returns true. 2064/// 2065/// @param Loc The location in the source that the incomplete type 2066/// diagnostic should refer to. 2067/// 2068/// @param T The type that this routine is examining for completeness. 2069/// 2070/// @param PD The partial diagnostic that will be printed out if T is not a 2071/// complete type. 2072/// 2073/// @returns @c true if @p T is incomplete and a diagnostic was emitted, 2074/// @c false otherwise. 2075bool Sema::RequireCompleteType(SourceLocation Loc, QualType T, 2076 const PartialDiagnostic &PD, 2077 std::pair<SourceLocation, 2078 PartialDiagnostic> Note) { 2079 unsigned diag = PD.getDiagID(); 2080 2081 // FIXME: Add this assertion to make sure we always get instantiation points. 2082 // assert(!Loc.isInvalid() && "Invalid location in RequireCompleteType"); 2083 // FIXME: Add this assertion to help us flush out problems with 2084 // checking for dependent types and type-dependent expressions. 2085 // 2086 // assert(!T->isDependentType() && 2087 // "Can't ask whether a dependent type is complete"); 2088 2089 // If we have a complete type, we're done. 2090 if (!T->isIncompleteType()) 2091 return false; 2092 2093 // If we have a class template specialization or a class member of a 2094 // class template specialization, or an array with known size of such, 2095 // try to instantiate it. 2096 QualType MaybeTemplate = T; 2097 if (const ConstantArrayType *Array = Context.getAsConstantArrayType(T)) 2098 MaybeTemplate = Array->getElementType(); 2099 if (const RecordType *Record = MaybeTemplate->getAs<RecordType>()) { 2100 if (ClassTemplateSpecializationDecl *ClassTemplateSpec 2101 = dyn_cast<ClassTemplateSpecializationDecl>(Record->getDecl())) { 2102 if (ClassTemplateSpec->getSpecializationKind() == TSK_Undeclared) 2103 return InstantiateClassTemplateSpecialization(Loc, ClassTemplateSpec, 2104 TSK_ImplicitInstantiation, 2105 /*Complain=*/diag != 0); 2106 } else if (CXXRecordDecl *Rec 2107 = dyn_cast<CXXRecordDecl>(Record->getDecl())) { 2108 if (CXXRecordDecl *Pattern = Rec->getInstantiatedFromMemberClass()) { 2109 MemberSpecializationInfo *MSInfo = Rec->getMemberSpecializationInfo(); 2110 assert(MSInfo && "Missing member specialization information?"); 2111 // This record was instantiated from a class within a template. 2112 if (MSInfo->getTemplateSpecializationKind() 2113 != TSK_ExplicitSpecialization) 2114 return InstantiateClass(Loc, Rec, Pattern, 2115 getTemplateInstantiationArgs(Rec), 2116 TSK_ImplicitInstantiation, 2117 /*Complain=*/diag != 0); 2118 } 2119 } 2120 } 2121 2122 if (diag == 0) 2123 return true; 2124 2125 const TagType *Tag = 0; 2126 if (const RecordType *Record = T->getAs<RecordType>()) 2127 Tag = Record; 2128 else if (const EnumType *Enum = T->getAs<EnumType>()) 2129 Tag = Enum; 2130 2131 // Avoid diagnosing invalid decls as incomplete. 2132 if (Tag && Tag->getDecl()->isInvalidDecl()) 2133 return true; 2134 2135 // We have an incomplete type. Produce a diagnostic. 2136 Diag(Loc, PD) << T; 2137 2138 // If we have a note, produce it. 2139 if (!Note.first.isInvalid()) 2140 Diag(Note.first, Note.second); 2141 2142 // If the type was a forward declaration of a class/struct/union 2143 // type, produce a note. 2144 if (Tag && !Tag->getDecl()->isInvalidDecl()) 2145 Diag(Tag->getDecl()->getLocation(), 2146 Tag->isBeingDefined() ? diag::note_type_being_defined 2147 : diag::note_forward_declaration) 2148 << QualType(Tag, 0); 2149 2150 return true; 2151} 2152 2153bool Sema::RequireCompleteType(SourceLocation Loc, QualType T, 2154 const PartialDiagnostic &PD) { 2155 return RequireCompleteType(Loc, T, PD, 2156 std::make_pair(SourceLocation(), PDiag(0))); 2157} 2158 2159bool Sema::RequireCompleteType(SourceLocation Loc, QualType T, 2160 unsigned DiagID) { 2161 return RequireCompleteType(Loc, T, PDiag(DiagID), 2162 std::make_pair(SourceLocation(), PDiag(0))); 2163} 2164 2165/// \brief Retrieve a version of the type 'T' that is elaborated by Keyword 2166/// and qualified by the nested-name-specifier contained in SS. 2167QualType Sema::getElaboratedType(ElaboratedTypeKeyword Keyword, 2168 const CXXScopeSpec &SS, QualType T) { 2169 if (T.isNull()) 2170 return T; 2171 NestedNameSpecifier *NNS; 2172 if (SS.isValid()) 2173 NNS = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 2174 else { 2175 if (Keyword == ETK_None) 2176 return T; 2177 NNS = 0; 2178 } 2179 return Context.getElaboratedType(Keyword, NNS, T); 2180} 2181 2182QualType Sema::BuildTypeofExprType(Expr *E) { 2183 if (E->getType() == Context.OverloadTy) { 2184 // C++ [temp.arg.explicit]p3 allows us to resolve a template-id to a 2185 // function template specialization wherever deduction cannot occur. 2186 if (FunctionDecl *Specialization 2187 = ResolveSingleFunctionTemplateSpecialization(E)) { 2188 // The access doesn't really matter in this case. 2189 DeclAccessPair Found = DeclAccessPair::make(Specialization, 2190 Specialization->getAccess()); 2191 E = FixOverloadedFunctionReference(E, Found, Specialization); 2192 if (!E) 2193 return QualType(); 2194 } else { 2195 Diag(E->getLocStart(), 2196 diag::err_cannot_determine_declared_type_of_overloaded_function) 2197 << false << E->getSourceRange(); 2198 return QualType(); 2199 } 2200 } 2201 2202 return Context.getTypeOfExprType(E); 2203} 2204 2205QualType Sema::BuildDecltypeType(Expr *E) { 2206 if (E->getType() == Context.OverloadTy) { 2207 // C++ [temp.arg.explicit]p3 allows us to resolve a template-id to a 2208 // function template specialization wherever deduction cannot occur. 2209 if (FunctionDecl *Specialization 2210 = ResolveSingleFunctionTemplateSpecialization(E)) { 2211 // The access doesn't really matter in this case. 2212 DeclAccessPair Found = DeclAccessPair::make(Specialization, 2213 Specialization->getAccess()); 2214 E = FixOverloadedFunctionReference(E, Found, Specialization); 2215 if (!E) 2216 return QualType(); 2217 } else { 2218 Diag(E->getLocStart(), 2219 diag::err_cannot_determine_declared_type_of_overloaded_function) 2220 << true << E->getSourceRange(); 2221 return QualType(); 2222 } 2223 } 2224 2225 return Context.getDecltypeType(E); 2226} 2227