SemaType.cpp revision f312b1ea179f1c44371f9ee0cd0bc006f612de11
1//===--- SemaType.cpp - Semantic Analysis for Types -----------------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements type-related semantic analysis. 11// 12//===----------------------------------------------------------------------===// 13 14#include "clang/Sema/SemaInternal.h" 15#include "clang/Sema/Template.h" 16#include "clang/AST/ASTContext.h" 17#include "clang/AST/CXXInheritance.h" 18#include "clang/AST/DeclObjC.h" 19#include "clang/AST/DeclTemplate.h" 20#include "clang/AST/TypeLoc.h" 21#include "clang/AST/TypeLocVisitor.h" 22#include "clang/AST/Expr.h" 23#include "clang/Basic/PartialDiagnostic.h" 24#include "clang/Basic/TargetInfo.h" 25#include "clang/Sema/DeclSpec.h" 26#include "llvm/ADT/SmallPtrSet.h" 27#include "llvm/Support/ErrorHandling.h" 28using namespace clang; 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 = dyn_cast_or_null<TypeDecl>(DS.getRepAsDecl()); 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.getRepAsType()); 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.getRepAsType()); 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 = DS.getRepAsExpr(); 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 = DS.getRepAsExpr(); 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, Expr *ArraySize, 754 SourceLocation AttrLoc) { 755 // unlike gcc's vector_size attribute, we do not allow vectors to be defined 756 // in conjunction with complex types (pointers, arrays, functions, etc.). 757 if (!T->isDependentType() && 758 !T->isIntegerType() && !T->isRealFloatingType()) { 759 Diag(AttrLoc, diag::err_attribute_invalid_vector_type) << T; 760 return QualType(); 761 } 762 763 if (!ArraySize->isTypeDependent() && !ArraySize->isValueDependent()) { 764 llvm::APSInt vecSize(32); 765 if (!ArraySize->isIntegerConstantExpr(vecSize, Context)) { 766 Diag(AttrLoc, diag::err_attribute_argument_not_int) 767 << "ext_vector_type" << ArraySize->getSourceRange(); 768 return QualType(); 769 } 770 771 // unlike gcc's vector_size attribute, the size is specified as the 772 // number of elements, not the number of bytes. 773 unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue()); 774 775 if (vectorSize == 0) { 776 Diag(AttrLoc, diag::err_attribute_zero_size) 777 << ArraySize->getSourceRange(); 778 return QualType(); 779 } 780 781 if (!T->isDependentType()) 782 return Context.getExtVectorType(T, vectorSize); 783 } 784 785 return Context.getDependentSizedExtVectorType(T, ArraySize, AttrLoc); 786} 787 788/// \brief Build a function type. 789/// 790/// This routine checks the function type according to C++ rules and 791/// under the assumption that the result type and parameter types have 792/// just been instantiated from a template. It therefore duplicates 793/// some of the behavior of GetTypeForDeclarator, but in a much 794/// simpler form that is only suitable for this narrow use case. 795/// 796/// \param T The return type of the function. 797/// 798/// \param ParamTypes The parameter types of the function. This array 799/// will be modified to account for adjustments to the types of the 800/// function parameters. 801/// 802/// \param NumParamTypes The number of parameter types in ParamTypes. 803/// 804/// \param Variadic Whether this is a variadic function type. 805/// 806/// \param Quals The cvr-qualifiers to be applied to the function type. 807/// 808/// \param Loc The location of the entity whose type involves this 809/// function type or, if there is no such entity, the location of the 810/// type that will have function type. 811/// 812/// \param Entity The name of the entity that involves the function 813/// type, if known. 814/// 815/// \returns A suitable function type, if there are no 816/// errors. Otherwise, returns a NULL type. 817QualType Sema::BuildFunctionType(QualType T, 818 QualType *ParamTypes, 819 unsigned NumParamTypes, 820 bool Variadic, unsigned Quals, 821 SourceLocation Loc, DeclarationName Entity, 822 const FunctionType::ExtInfo &Info) { 823 if (T->isArrayType() || T->isFunctionType()) { 824 Diag(Loc, diag::err_func_returning_array_function) 825 << T->isFunctionType() << T; 826 return QualType(); 827 } 828 829 bool Invalid = false; 830 for (unsigned Idx = 0; Idx < NumParamTypes; ++Idx) { 831 QualType ParamType = adjustParameterType(ParamTypes[Idx]); 832 if (ParamType->isVoidType()) { 833 Diag(Loc, diag::err_param_with_void_type); 834 Invalid = true; 835 } 836 837 ParamTypes[Idx] = ParamType; 838 } 839 840 if (Invalid) 841 return QualType(); 842 843 return Context.getFunctionType(T, ParamTypes, NumParamTypes, Variadic, 844 Quals, false, false, 0, 0, Info); 845} 846 847/// \brief Build a member pointer type \c T Class::*. 848/// 849/// \param T the type to which the member pointer refers. 850/// \param Class the class type into which the member pointer points. 851/// \param CVR Qualifiers applied to the member pointer type 852/// \param Loc the location where this type begins 853/// \param Entity the name of the entity that will have this member pointer type 854/// 855/// \returns a member pointer type, if successful, or a NULL type if there was 856/// an error. 857QualType Sema::BuildMemberPointerType(QualType T, QualType Class, 858 SourceLocation Loc, 859 DeclarationName Entity) { 860 // Verify that we're not building a pointer to pointer to function with 861 // exception specification. 862 if (CheckDistantExceptionSpec(T)) { 863 Diag(Loc, diag::err_distant_exception_spec); 864 865 // FIXME: If we're doing this as part of template instantiation, 866 // we should return immediately. 867 868 // Build the type anyway, but use the canonical type so that the 869 // exception specifiers are stripped off. 870 T = Context.getCanonicalType(T); 871 } 872 873 // C++ 8.3.3p3: A pointer to member shall not point to ... a member 874 // with reference type, or "cv void." 875 if (T->isReferenceType()) { 876 Diag(Loc, diag::err_illegal_decl_mempointer_to_reference) 877 << (Entity? Entity.getAsString() : "type name") << T; 878 return QualType(); 879 } 880 881 if (T->isVoidType()) { 882 Diag(Loc, diag::err_illegal_decl_mempointer_to_void) 883 << (Entity? Entity.getAsString() : "type name"); 884 return QualType(); 885 } 886 887 if (!Class->isDependentType() && !Class->isRecordType()) { 888 Diag(Loc, diag::err_mempointer_in_nonclass_type) << Class; 889 return QualType(); 890 } 891 892 // In the Microsoft ABI, the class is allowed to be an incomplete 893 // type. In such cases, the compiler makes a worst-case assumption. 894 // We make no such assumption right now, so emit an error if the 895 // class isn't a complete type. 896 if (Context.Target.getCXXABI() == CXXABI_Microsoft && 897 RequireCompleteType(Loc, Class, diag::err_incomplete_type)) 898 return QualType(); 899 900 return Context.getMemberPointerType(T, Class.getTypePtr()); 901} 902 903/// \brief Build a block pointer type. 904/// 905/// \param T The type to which we'll be building a block pointer. 906/// 907/// \param CVR The cvr-qualifiers to be applied to the block pointer type. 908/// 909/// \param Loc The location of the entity whose type involves this 910/// block pointer type or, if there is no such entity, the location of the 911/// type that will have block pointer type. 912/// 913/// \param Entity The name of the entity that involves the block pointer 914/// type, if known. 915/// 916/// \returns A suitable block pointer type, if there are no 917/// errors. Otherwise, returns a NULL type. 918QualType Sema::BuildBlockPointerType(QualType T, 919 SourceLocation Loc, 920 DeclarationName Entity) { 921 if (!T->isFunctionType()) { 922 Diag(Loc, diag::err_nonfunction_block_type); 923 return QualType(); 924 } 925 926 return Context.getBlockPointerType(T); 927} 928 929QualType Sema::GetTypeFromParser(ParsedType Ty, TypeSourceInfo **TInfo) { 930 QualType QT = Ty.get(); 931 if (QT.isNull()) { 932 if (TInfo) *TInfo = 0; 933 return QualType(); 934 } 935 936 TypeSourceInfo *DI = 0; 937 if (LocInfoType *LIT = dyn_cast<LocInfoType>(QT)) { 938 QT = LIT->getType(); 939 DI = LIT->getTypeSourceInfo(); 940 } 941 942 if (TInfo) *TInfo = DI; 943 return QT; 944} 945 946/// GetTypeForDeclarator - Convert the type for the specified 947/// declarator to Type instances. 948/// 949/// If OwnedDecl is non-NULL, and this declarator's decl-specifier-seq 950/// owns the declaration of a type (e.g., the definition of a struct 951/// type), then *OwnedDecl will receive the owned declaration. 952/// 953/// The result of this call will never be null, but the associated 954/// type may be a null type if there's an unrecoverable error. 955TypeSourceInfo *Sema::GetTypeForDeclarator(Declarator &D, Scope *S, 956 TagDecl **OwnedDecl) { 957 // Determine the type of the declarator. Not all forms of declarator 958 // have a type. 959 QualType T; 960 TypeSourceInfo *ReturnTypeInfo = 0; 961 962 llvm::SmallVector<DelayedAttribute,4> FnAttrsFromDeclSpec; 963 964 switch (D.getName().getKind()) { 965 case UnqualifiedId::IK_Identifier: 966 case UnqualifiedId::IK_OperatorFunctionId: 967 case UnqualifiedId::IK_LiteralOperatorId: 968 case UnqualifiedId::IK_TemplateId: 969 T = ConvertDeclSpecToType(*this, D, FnAttrsFromDeclSpec); 970 971 if (!D.isInvalidType() && D.getDeclSpec().isTypeSpecOwned()) { 972 TagDecl* Owned = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 973 // Owned is embedded if it was defined here, or if it is the 974 // very first (i.e., canonical) declaration of this tag type. 975 Owned->setEmbeddedInDeclarator(Owned->isDefinition() || 976 Owned->isCanonicalDecl()); 977 if (OwnedDecl) *OwnedDecl = Owned; 978 } 979 break; 980 981 case UnqualifiedId::IK_ConstructorName: 982 case UnqualifiedId::IK_ConstructorTemplateId: 983 case UnqualifiedId::IK_DestructorName: 984 // Constructors and destructors don't have return types. Use 985 // "void" instead. 986 T = Context.VoidTy; 987 break; 988 989 case UnqualifiedId::IK_ConversionFunctionId: 990 // The result type of a conversion function is the type that it 991 // converts to. 992 T = GetTypeFromParser(D.getName().ConversionFunctionId, 993 &ReturnTypeInfo); 994 break; 995 } 996 997 if (T.isNull()) 998 return Context.getNullTypeSourceInfo(); 999 1000 if (T == Context.UndeducedAutoTy) { 1001 int Error = -1; 1002 1003 switch (D.getContext()) { 1004 case Declarator::KNRTypeListContext: 1005 assert(0 && "K&R type lists aren't allowed in C++"); 1006 break; 1007 case Declarator::PrototypeContext: 1008 Error = 0; // Function prototype 1009 break; 1010 case Declarator::MemberContext: 1011 switch (cast<TagDecl>(CurContext)->getTagKind()) { 1012 case TTK_Enum: assert(0 && "unhandled tag kind"); break; 1013 case TTK_Struct: Error = 1; /* Struct member */ break; 1014 case TTK_Union: Error = 2; /* Union member */ break; 1015 case TTK_Class: Error = 3; /* Class member */ break; 1016 } 1017 break; 1018 case Declarator::CXXCatchContext: 1019 Error = 4; // Exception declaration 1020 break; 1021 case Declarator::TemplateParamContext: 1022 Error = 5; // Template parameter 1023 break; 1024 case Declarator::BlockLiteralContext: 1025 Error = 6; // Block literal 1026 break; 1027 case Declarator::FileContext: 1028 case Declarator::BlockContext: 1029 case Declarator::ForContext: 1030 case Declarator::ConditionContext: 1031 case Declarator::TypeNameContext: 1032 break; 1033 } 1034 1035 if (Error != -1) { 1036 Diag(D.getDeclSpec().getTypeSpecTypeLoc(), diag::err_auto_not_allowed) 1037 << Error; 1038 T = Context.IntTy; 1039 D.setInvalidType(true); 1040 } 1041 } 1042 1043 // The name we're declaring, if any. 1044 DeclarationName Name; 1045 if (D.getIdentifier()) 1046 Name = D.getIdentifier(); 1047 1048 llvm::SmallVector<DelayedAttribute,4> FnAttrsFromPreviousChunk; 1049 1050 // Walk the DeclTypeInfo, building the recursive type as we go. 1051 // DeclTypeInfos are ordered from the identifier out, which is 1052 // opposite of what we want :). 1053 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 1054 DeclaratorChunk &DeclType = D.getTypeObject(e-i-1); 1055 switch (DeclType.Kind) { 1056 default: assert(0 && "Unknown decltype!"); 1057 case DeclaratorChunk::BlockPointer: 1058 // If blocks are disabled, emit an error. 1059 if (!LangOpts.Blocks) 1060 Diag(DeclType.Loc, diag::err_blocks_disable); 1061 1062 T = BuildBlockPointerType(T, D.getIdentifierLoc(), Name); 1063 if (DeclType.Cls.TypeQuals) 1064 T = BuildQualifiedType(T, DeclType.Loc, DeclType.Cls.TypeQuals); 1065 break; 1066 case DeclaratorChunk::Pointer: 1067 // Verify that we're not building a pointer 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 if (getLangOptions().ObjC1 && T->getAs<ObjCObjectType>()) { 1075 T = Context.getObjCObjectPointerType(T); 1076 if (DeclType.Ptr.TypeQuals) 1077 T = BuildQualifiedType(T, DeclType.Loc, DeclType.Ptr.TypeQuals); 1078 break; 1079 } 1080 T = BuildPointerType(T, DeclType.Loc, Name); 1081 if (DeclType.Ptr.TypeQuals) 1082 T = BuildQualifiedType(T, DeclType.Loc, DeclType.Ptr.TypeQuals); 1083 break; 1084 case DeclaratorChunk::Reference: { 1085 // Verify that we're not building a reference to pointer to function with 1086 // exception specification. 1087 if (getLangOptions().CPlusPlus && CheckDistantExceptionSpec(T)) { 1088 Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 1089 D.setInvalidType(true); 1090 // Build the type anyway. 1091 } 1092 T = BuildReferenceType(T, DeclType.Ref.LValueRef, DeclType.Loc, Name); 1093 1094 Qualifiers Quals; 1095 if (DeclType.Ref.HasRestrict) 1096 T = BuildQualifiedType(T, DeclType.Loc, Qualifiers::Restrict); 1097 break; 1098 } 1099 case DeclaratorChunk::Array: { 1100 // Verify that we're not building an array of pointers to function with 1101 // exception specification. 1102 if (getLangOptions().CPlusPlus && CheckDistantExceptionSpec(T)) { 1103 Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 1104 D.setInvalidType(true); 1105 // Build the type anyway. 1106 } 1107 DeclaratorChunk::ArrayTypeInfo &ATI = DeclType.Arr; 1108 Expr *ArraySize = static_cast<Expr*>(ATI.NumElts); 1109 ArrayType::ArraySizeModifier ASM; 1110 if (ATI.isStar) 1111 ASM = ArrayType::Star; 1112 else if (ATI.hasStatic) 1113 ASM = ArrayType::Static; 1114 else 1115 ASM = ArrayType::Normal; 1116 if (ASM == ArrayType::Star && 1117 D.getContext() != Declarator::PrototypeContext) { 1118 // FIXME: This check isn't quite right: it allows star in prototypes 1119 // for function definitions, and disallows some edge cases detailed 1120 // in http://gcc.gnu.org/ml/gcc-patches/2009-02/msg00133.html 1121 Diag(DeclType.Loc, diag::err_array_star_outside_prototype); 1122 ASM = ArrayType::Normal; 1123 D.setInvalidType(true); 1124 } 1125 T = BuildArrayType(T, ASM, ArraySize, 1126 Qualifiers::fromCVRMask(ATI.TypeQuals), 1127 SourceRange(DeclType.Loc, DeclType.EndLoc), Name); 1128 break; 1129 } 1130 case DeclaratorChunk::Function: { 1131 // If the function declarator has a prototype (i.e. it is not () and 1132 // does not have a K&R-style identifier list), then the arguments are part 1133 // of the type, otherwise the argument list is (). 1134 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun; 1135 1136 // C99 6.7.5.3p1: The return type may not be a function or array type. 1137 // For conversion functions, we'll diagnose this particular error later. 1138 if ((T->isArrayType() || T->isFunctionType()) && 1139 (D.getName().getKind() != UnqualifiedId::IK_ConversionFunctionId)) { 1140 Diag(DeclType.Loc, diag::err_func_returning_array_function) 1141 << T->isFunctionType() << T; 1142 T = Context.IntTy; 1143 D.setInvalidType(true); 1144 } 1145 1146 // cv-qualifiers on return types are pointless except when the type is a 1147 // class type in C++. 1148 if (T.getCVRQualifiers() && D.getDeclSpec().getTypeQualifiers() && 1149 (!getLangOptions().CPlusPlus || 1150 (!T->isDependentType() && !T->isRecordType()))) { 1151 unsigned Quals = D.getDeclSpec().getTypeQualifiers(); 1152 std::string QualStr; 1153 unsigned NumQuals = 0; 1154 SourceLocation Loc; 1155 if (Quals & Qualifiers::Const) { 1156 Loc = D.getDeclSpec().getConstSpecLoc(); 1157 ++NumQuals; 1158 QualStr = "const"; 1159 } 1160 if (Quals & Qualifiers::Volatile) { 1161 if (NumQuals == 0) { 1162 Loc = D.getDeclSpec().getVolatileSpecLoc(); 1163 QualStr = "volatile"; 1164 } else 1165 QualStr += " volatile"; 1166 ++NumQuals; 1167 } 1168 if (Quals & Qualifiers::Restrict) { 1169 if (NumQuals == 0) { 1170 Loc = D.getDeclSpec().getRestrictSpecLoc(); 1171 QualStr = "restrict"; 1172 } else 1173 QualStr += " restrict"; 1174 ++NumQuals; 1175 } 1176 assert(NumQuals > 0 && "No known qualifiers?"); 1177 1178 SemaDiagnosticBuilder DB = Diag(Loc, diag::warn_qual_return_type); 1179 DB << QualStr << NumQuals; 1180 if (Quals & Qualifiers::Const) 1181 DB << FixItHint::CreateRemoval(D.getDeclSpec().getConstSpecLoc()); 1182 if (Quals & Qualifiers::Volatile) 1183 DB << FixItHint::CreateRemoval(D.getDeclSpec().getVolatileSpecLoc()); 1184 if (Quals & Qualifiers::Restrict) 1185 DB << FixItHint::CreateRemoval(D.getDeclSpec().getRestrictSpecLoc()); 1186 } 1187 1188 if (getLangOptions().CPlusPlus && D.getDeclSpec().isTypeSpecOwned()) { 1189 // C++ [dcl.fct]p6: 1190 // Types shall not be defined in return or parameter types. 1191 TagDecl *Tag = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 1192 if (Tag->isDefinition()) 1193 Diag(Tag->getLocation(), diag::err_type_defined_in_result_type) 1194 << Context.getTypeDeclType(Tag); 1195 } 1196 1197 // Exception specs are not allowed in typedefs. Complain, but add it 1198 // anyway. 1199 if (FTI.hasExceptionSpec && 1200 D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 1201 Diag(FTI.getThrowLoc(), diag::err_exception_spec_in_typedef); 1202 1203 if (!FTI.NumArgs && !FTI.isVariadic && !getLangOptions().CPlusPlus) { 1204 // Simple void foo(), where the incoming T is the result type. 1205 T = Context.getFunctionNoProtoType(T); 1206 } else { 1207 // We allow a zero-parameter variadic function in C if the 1208 // function is marked with the "overloadable" attribute. Scan 1209 // for this attribute now. 1210 if (!FTI.NumArgs && FTI.isVariadic && !getLangOptions().CPlusPlus) { 1211 bool Overloadable = false; 1212 for (const AttributeList *Attrs = D.getAttributes(); 1213 Attrs; Attrs = Attrs->getNext()) { 1214 if (Attrs->getKind() == AttributeList::AT_overloadable) { 1215 Overloadable = true; 1216 break; 1217 } 1218 } 1219 1220 if (!Overloadable) 1221 Diag(FTI.getEllipsisLoc(), diag::err_ellipsis_first_arg); 1222 } 1223 1224 if (FTI.NumArgs && FTI.ArgInfo[0].Param == 0) { 1225 // C99 6.7.5.3p3: Reject int(x,y,z) when it's not a function 1226 // definition. 1227 Diag(FTI.ArgInfo[0].IdentLoc, diag::err_ident_list_in_fn_declaration); 1228 D.setInvalidType(true); 1229 break; 1230 } 1231 1232 // Otherwise, we have a function with an argument list that is 1233 // potentially variadic. 1234 llvm::SmallVector<QualType, 16> ArgTys; 1235 ArgTys.reserve(FTI.NumArgs); 1236 1237 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 1238 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 1239 QualType ArgTy = Param->getType(); 1240 assert(!ArgTy.isNull() && "Couldn't parse type?"); 1241 1242 // Adjust the parameter type. 1243 assert((ArgTy == adjustParameterType(ArgTy)) && "Unadjusted type?"); 1244 1245 // Look for 'void'. void is allowed only as a single argument to a 1246 // function with no other parameters (C99 6.7.5.3p10). We record 1247 // int(void) as a FunctionProtoType with an empty argument list. 1248 if (ArgTy->isVoidType()) { 1249 // If this is something like 'float(int, void)', reject it. 'void' 1250 // is an incomplete type (C99 6.2.5p19) and function decls cannot 1251 // have arguments of incomplete type. 1252 if (FTI.NumArgs != 1 || FTI.isVariadic) { 1253 Diag(DeclType.Loc, diag::err_void_only_param); 1254 ArgTy = Context.IntTy; 1255 Param->setType(ArgTy); 1256 } else if (FTI.ArgInfo[i].Ident) { 1257 // Reject, but continue to parse 'int(void abc)'. 1258 Diag(FTI.ArgInfo[i].IdentLoc, 1259 diag::err_param_with_void_type); 1260 ArgTy = Context.IntTy; 1261 Param->setType(ArgTy); 1262 } else { 1263 // Reject, but continue to parse 'float(const void)'. 1264 if (ArgTy.hasQualifiers()) 1265 Diag(DeclType.Loc, diag::err_void_param_qualified); 1266 1267 // Do not add 'void' to the ArgTys list. 1268 break; 1269 } 1270 } else if (!FTI.hasPrototype) { 1271 if (ArgTy->isPromotableIntegerType()) { 1272 ArgTy = Context.getPromotedIntegerType(ArgTy); 1273 } else if (const BuiltinType* BTy = ArgTy->getAs<BuiltinType>()) { 1274 if (BTy->getKind() == BuiltinType::Float) 1275 ArgTy = Context.DoubleTy; 1276 } 1277 } 1278 1279 ArgTys.push_back(ArgTy); 1280 } 1281 1282 llvm::SmallVector<QualType, 4> Exceptions; 1283 Exceptions.reserve(FTI.NumExceptions); 1284 for (unsigned ei = 0, ee = FTI.NumExceptions; ei != ee; ++ei) { 1285 // FIXME: Preserve type source info. 1286 QualType ET = GetTypeFromParser(FTI.Exceptions[ei].Ty); 1287 // Check that the type is valid for an exception spec, and drop it if 1288 // not. 1289 if (!CheckSpecifiedExceptionType(ET, FTI.Exceptions[ei].Range)) 1290 Exceptions.push_back(ET); 1291 } 1292 1293 T = Context.getFunctionType(T, ArgTys.data(), ArgTys.size(), 1294 FTI.isVariadic, FTI.TypeQuals, 1295 FTI.hasExceptionSpec, 1296 FTI.hasAnyExceptionSpec, 1297 Exceptions.size(), Exceptions.data(), 1298 FunctionType::ExtInfo()); 1299 } 1300 1301 // For GCC compatibility, we allow attributes that apply only to 1302 // function types to be placed on a function's return type 1303 // instead (as long as that type doesn't happen to be function 1304 // or function-pointer itself). 1305 ProcessDelayedFnAttrs(*this, T, FnAttrsFromPreviousChunk); 1306 1307 break; 1308 } 1309 case DeclaratorChunk::MemberPointer: 1310 // The scope spec must refer to a class, or be dependent. 1311 CXXScopeSpec &SS = DeclType.Mem.Scope(); 1312 QualType ClsType; 1313 if (SS.isInvalid()) { 1314 // Avoid emitting extra errors if we already errored on the scope. 1315 D.setInvalidType(true); 1316 } else if (isDependentScopeSpecifier(SS) || 1317 dyn_cast_or_null<CXXRecordDecl>(computeDeclContext(SS))) { 1318 NestedNameSpecifier *NNS 1319 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1320 NestedNameSpecifier *NNSPrefix = NNS->getPrefix(); 1321 switch (NNS->getKind()) { 1322 case NestedNameSpecifier::Identifier: 1323 ClsType = Context.getDependentNameType(ETK_None, NNSPrefix, 1324 NNS->getAsIdentifier()); 1325 break; 1326 1327 case NestedNameSpecifier::Namespace: 1328 case NestedNameSpecifier::Global: 1329 llvm_unreachable("Nested-name-specifier must name a type"); 1330 break; 1331 1332 case NestedNameSpecifier::TypeSpec: 1333 case NestedNameSpecifier::TypeSpecWithTemplate: 1334 ClsType = QualType(NNS->getAsType(), 0); 1335 // Note: if NNS is dependent, then its prefix (if any) is already 1336 // included in ClsType; this does not hold if the NNS is 1337 // nondependent: in this case (if there is indeed a prefix) 1338 // ClsType needs to be wrapped into an elaborated type. 1339 if (NNSPrefix && !NNS->isDependent()) 1340 ClsType = Context.getElaboratedType(ETK_None, NNSPrefix, ClsType); 1341 break; 1342 } 1343 } else { 1344 Diag(DeclType.Mem.Scope().getBeginLoc(), 1345 diag::err_illegal_decl_mempointer_in_nonclass) 1346 << (D.getIdentifier() ? D.getIdentifier()->getName() : "type name") 1347 << DeclType.Mem.Scope().getRange(); 1348 D.setInvalidType(true); 1349 } 1350 1351 if (!ClsType.isNull()) 1352 T = BuildMemberPointerType(T, ClsType, DeclType.Loc, D.getIdentifier()); 1353 if (T.isNull()) { 1354 T = Context.IntTy; 1355 D.setInvalidType(true); 1356 } else if (DeclType.Mem.TypeQuals) { 1357 T = BuildQualifiedType(T, DeclType.Loc, DeclType.Mem.TypeQuals); 1358 } 1359 break; 1360 } 1361 1362 if (T.isNull()) { 1363 D.setInvalidType(true); 1364 T = Context.IntTy; 1365 } 1366 1367 DiagnoseDelayedFnAttrs(*this, FnAttrsFromPreviousChunk); 1368 1369 // See if there are any attributes on this declarator chunk. 1370 if (const AttributeList *AL = DeclType.getAttrs()) 1371 ProcessTypeAttributeList(*this, T, false, AL, FnAttrsFromPreviousChunk); 1372 } 1373 1374 if (getLangOptions().CPlusPlus && T->isFunctionType()) { 1375 const FunctionProtoType *FnTy = T->getAs<FunctionProtoType>(); 1376 assert(FnTy && "Why oh why is there not a FunctionProtoType here?"); 1377 1378 // C++ 8.3.5p4: A cv-qualifier-seq shall only be part of the function type 1379 // for a nonstatic member function, the function type to which a pointer 1380 // to member refers, or the top-level function type of a function typedef 1381 // declaration. 1382 bool FreeFunction = (D.getContext() != Declarator::MemberContext && 1383 (!D.getCXXScopeSpec().isSet() || 1384 !computeDeclContext(D.getCXXScopeSpec(), /*FIXME:*/true)->isRecord())); 1385 if (FnTy->getTypeQuals() != 0 && 1386 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 1387 (FreeFunction || 1388 D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_static)) { 1389 if (D.isFunctionDeclarator()) 1390 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_function_type); 1391 else 1392 Diag(D.getIdentifierLoc(), 1393 diag::err_invalid_qualified_typedef_function_type_use) 1394 << FreeFunction; 1395 1396 // Strip the cv-quals from the type. 1397 T = Context.getFunctionType(FnTy->getResultType(), FnTy->arg_type_begin(), 1398 FnTy->getNumArgs(), FnTy->isVariadic(), 0, 1399 false, false, 0, 0, FunctionType::ExtInfo()); 1400 } 1401 } 1402 1403 // If there's a constexpr specifier, treat it as a top-level const. 1404 if (D.getDeclSpec().isConstexprSpecified()) { 1405 T.addConst(); 1406 } 1407 1408 // Process any function attributes we might have delayed from the 1409 // declaration-specifiers. 1410 ProcessDelayedFnAttrs(*this, T, FnAttrsFromDeclSpec); 1411 1412 // If there were any type attributes applied to the decl itself, not 1413 // the type, apply them to the result type. But don't do this for 1414 // block-literal expressions, which are parsed wierdly. 1415 if (D.getContext() != Declarator::BlockLiteralContext) 1416 if (const AttributeList *Attrs = D.getAttributes()) 1417 ProcessTypeAttributeList(*this, T, false, Attrs, 1418 FnAttrsFromPreviousChunk); 1419 1420 DiagnoseDelayedFnAttrs(*this, FnAttrsFromPreviousChunk); 1421 1422 if (T.isNull()) 1423 return Context.getNullTypeSourceInfo(); 1424 else if (D.isInvalidType()) 1425 return Context.getTrivialTypeSourceInfo(T); 1426 return GetTypeSourceInfoForDeclarator(D, T, ReturnTypeInfo); 1427} 1428 1429namespace { 1430 class TypeSpecLocFiller : public TypeLocVisitor<TypeSpecLocFiller> { 1431 const DeclSpec &DS; 1432 1433 public: 1434 TypeSpecLocFiller(const DeclSpec &DS) : DS(DS) {} 1435 1436 void VisitQualifiedTypeLoc(QualifiedTypeLoc TL) { 1437 Visit(TL.getUnqualifiedLoc()); 1438 } 1439 void VisitTypedefTypeLoc(TypedefTypeLoc TL) { 1440 TL.setNameLoc(DS.getTypeSpecTypeLoc()); 1441 } 1442 void VisitObjCInterfaceTypeLoc(ObjCInterfaceTypeLoc TL) { 1443 TL.setNameLoc(DS.getTypeSpecTypeLoc()); 1444 } 1445 void VisitObjCObjectTypeLoc(ObjCObjectTypeLoc TL) { 1446 // Handle the base type, which might not have been written explicitly. 1447 if (DS.getTypeSpecType() == DeclSpec::TST_unspecified) { 1448 TL.setHasBaseTypeAsWritten(false); 1449 TL.getBaseLoc().initialize(SourceLocation()); 1450 } else { 1451 TL.setHasBaseTypeAsWritten(true); 1452 Visit(TL.getBaseLoc()); 1453 } 1454 1455 // Protocol qualifiers. 1456 if (DS.getProtocolQualifiers()) { 1457 assert(TL.getNumProtocols() > 0); 1458 assert(TL.getNumProtocols() == DS.getNumProtocolQualifiers()); 1459 TL.setLAngleLoc(DS.getProtocolLAngleLoc()); 1460 TL.setRAngleLoc(DS.getSourceRange().getEnd()); 1461 for (unsigned i = 0, e = DS.getNumProtocolQualifiers(); i != e; ++i) 1462 TL.setProtocolLoc(i, DS.getProtocolLocs()[i]); 1463 } else { 1464 assert(TL.getNumProtocols() == 0); 1465 TL.setLAngleLoc(SourceLocation()); 1466 TL.setRAngleLoc(SourceLocation()); 1467 } 1468 } 1469 void VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL) { 1470 TL.setStarLoc(SourceLocation()); 1471 Visit(TL.getPointeeLoc()); 1472 } 1473 void VisitTemplateSpecializationTypeLoc(TemplateSpecializationTypeLoc TL) { 1474 TypeSourceInfo *TInfo = 0; 1475 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 1476 1477 // If we got no declarator info from previous Sema routines, 1478 // just fill with the typespec loc. 1479 if (!TInfo) { 1480 TL.initialize(DS.getTypeSpecTypeLoc()); 1481 return; 1482 } 1483 1484 TypeLoc OldTL = TInfo->getTypeLoc(); 1485 if (TInfo->getType()->getAs<ElaboratedType>()) { 1486 ElaboratedTypeLoc ElabTL = cast<ElaboratedTypeLoc>(OldTL); 1487 TemplateSpecializationTypeLoc NamedTL = 1488 cast<TemplateSpecializationTypeLoc>(ElabTL.getNamedTypeLoc()); 1489 TL.copy(NamedTL); 1490 } 1491 else 1492 TL.copy(cast<TemplateSpecializationTypeLoc>(OldTL)); 1493 } 1494 void VisitTypeOfExprTypeLoc(TypeOfExprTypeLoc TL) { 1495 assert(DS.getTypeSpecType() == DeclSpec::TST_typeofExpr); 1496 TL.setTypeofLoc(DS.getTypeSpecTypeLoc()); 1497 TL.setParensRange(DS.getTypeofParensRange()); 1498 } 1499 void VisitTypeOfTypeLoc(TypeOfTypeLoc TL) { 1500 assert(DS.getTypeSpecType() == DeclSpec::TST_typeofType); 1501 TL.setTypeofLoc(DS.getTypeSpecTypeLoc()); 1502 TL.setParensRange(DS.getTypeofParensRange()); 1503 assert(DS.getRepAsType()); 1504 TypeSourceInfo *TInfo = 0; 1505 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 1506 TL.setUnderlyingTInfo(TInfo); 1507 } 1508 void VisitBuiltinTypeLoc(BuiltinTypeLoc TL) { 1509 // By default, use the source location of the type specifier. 1510 TL.setBuiltinLoc(DS.getTypeSpecTypeLoc()); 1511 if (TL.needsExtraLocalData()) { 1512 // Set info for the written builtin specifiers. 1513 TL.getWrittenBuiltinSpecs() = DS.getWrittenBuiltinSpecs(); 1514 // Try to have a meaningful source location. 1515 if (TL.getWrittenSignSpec() != TSS_unspecified) 1516 // Sign spec loc overrides the others (e.g., 'unsigned long'). 1517 TL.setBuiltinLoc(DS.getTypeSpecSignLoc()); 1518 else if (TL.getWrittenWidthSpec() != TSW_unspecified) 1519 // Width spec loc overrides type spec loc (e.g., 'short int'). 1520 TL.setBuiltinLoc(DS.getTypeSpecWidthLoc()); 1521 } 1522 } 1523 void VisitElaboratedTypeLoc(ElaboratedTypeLoc TL) { 1524 ElaboratedTypeKeyword Keyword 1525 = TypeWithKeyword::getKeywordForTypeSpec(DS.getTypeSpecType()); 1526 if (Keyword == ETK_Typename) { 1527 TypeSourceInfo *TInfo = 0; 1528 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 1529 if (TInfo) { 1530 TL.copy(cast<ElaboratedTypeLoc>(TInfo->getTypeLoc())); 1531 return; 1532 } 1533 } 1534 TL.setKeywordLoc(Keyword != ETK_None 1535 ? DS.getTypeSpecTypeLoc() 1536 : SourceLocation()); 1537 const CXXScopeSpec& SS = DS.getTypeSpecScope(); 1538 TL.setQualifierRange(SS.isEmpty() ? SourceRange(): SS.getRange()); 1539 Visit(TL.getNextTypeLoc().getUnqualifiedLoc()); 1540 } 1541 void VisitDependentNameTypeLoc(DependentNameTypeLoc TL) { 1542 ElaboratedTypeKeyword Keyword 1543 = TypeWithKeyword::getKeywordForTypeSpec(DS.getTypeSpecType()); 1544 if (Keyword == ETK_Typename) { 1545 TypeSourceInfo *TInfo = 0; 1546 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 1547 if (TInfo) { 1548 TL.copy(cast<DependentNameTypeLoc>(TInfo->getTypeLoc())); 1549 return; 1550 } 1551 } 1552 TL.setKeywordLoc(Keyword != ETK_None 1553 ? DS.getTypeSpecTypeLoc() 1554 : SourceLocation()); 1555 const CXXScopeSpec& SS = DS.getTypeSpecScope(); 1556 TL.setQualifierRange(SS.isEmpty() ? SourceRange() : SS.getRange()); 1557 // FIXME: load appropriate source location. 1558 TL.setNameLoc(DS.getTypeSpecTypeLoc()); 1559 } 1560 void VisitDependentTemplateSpecializationTypeLoc( 1561 DependentTemplateSpecializationTypeLoc TL) { 1562 ElaboratedTypeKeyword Keyword 1563 = TypeWithKeyword::getKeywordForTypeSpec(DS.getTypeSpecType()); 1564 if (Keyword == ETK_Typename) { 1565 TypeSourceInfo *TInfo = 0; 1566 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 1567 if (TInfo) { 1568 TL.copy(cast<DependentTemplateSpecializationTypeLoc>( 1569 TInfo->getTypeLoc())); 1570 return; 1571 } 1572 } 1573 TL.initializeLocal(SourceLocation()); 1574 TL.setKeywordLoc(Keyword != ETK_None 1575 ? DS.getTypeSpecTypeLoc() 1576 : SourceLocation()); 1577 const CXXScopeSpec& SS = DS.getTypeSpecScope(); 1578 TL.setQualifierRange(SS.isEmpty() ? SourceRange() : SS.getRange()); 1579 // FIXME: load appropriate source location. 1580 TL.setNameLoc(DS.getTypeSpecTypeLoc()); 1581 } 1582 1583 void VisitTypeLoc(TypeLoc TL) { 1584 // FIXME: add other typespec types and change this to an assert. 1585 TL.initialize(DS.getTypeSpecTypeLoc()); 1586 } 1587 }; 1588 1589 class DeclaratorLocFiller : public TypeLocVisitor<DeclaratorLocFiller> { 1590 const DeclaratorChunk &Chunk; 1591 1592 public: 1593 DeclaratorLocFiller(const DeclaratorChunk &Chunk) : Chunk(Chunk) {} 1594 1595 void VisitQualifiedTypeLoc(QualifiedTypeLoc TL) { 1596 llvm_unreachable("qualified type locs not expected here!"); 1597 } 1598 1599 void VisitBlockPointerTypeLoc(BlockPointerTypeLoc TL) { 1600 assert(Chunk.Kind == DeclaratorChunk::BlockPointer); 1601 TL.setCaretLoc(Chunk.Loc); 1602 } 1603 void VisitPointerTypeLoc(PointerTypeLoc TL) { 1604 assert(Chunk.Kind == DeclaratorChunk::Pointer); 1605 TL.setStarLoc(Chunk.Loc); 1606 } 1607 void VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL) { 1608 assert(Chunk.Kind == DeclaratorChunk::Pointer); 1609 TL.setStarLoc(Chunk.Loc); 1610 } 1611 void VisitMemberPointerTypeLoc(MemberPointerTypeLoc TL) { 1612 assert(Chunk.Kind == DeclaratorChunk::MemberPointer); 1613 TL.setStarLoc(Chunk.Loc); 1614 // FIXME: nested name specifier 1615 } 1616 void VisitLValueReferenceTypeLoc(LValueReferenceTypeLoc TL) { 1617 assert(Chunk.Kind == DeclaratorChunk::Reference); 1618 // 'Amp' is misleading: this might have been originally 1619 /// spelled with AmpAmp. 1620 TL.setAmpLoc(Chunk.Loc); 1621 } 1622 void VisitRValueReferenceTypeLoc(RValueReferenceTypeLoc TL) { 1623 assert(Chunk.Kind == DeclaratorChunk::Reference); 1624 assert(!Chunk.Ref.LValueRef); 1625 TL.setAmpAmpLoc(Chunk.Loc); 1626 } 1627 void VisitArrayTypeLoc(ArrayTypeLoc TL) { 1628 assert(Chunk.Kind == DeclaratorChunk::Array); 1629 TL.setLBracketLoc(Chunk.Loc); 1630 TL.setRBracketLoc(Chunk.EndLoc); 1631 TL.setSizeExpr(static_cast<Expr*>(Chunk.Arr.NumElts)); 1632 } 1633 void VisitFunctionTypeLoc(FunctionTypeLoc TL) { 1634 assert(Chunk.Kind == DeclaratorChunk::Function); 1635 TL.setLParenLoc(Chunk.Loc); 1636 TL.setRParenLoc(Chunk.EndLoc); 1637 1638 const DeclaratorChunk::FunctionTypeInfo &FTI = Chunk.Fun; 1639 for (unsigned i = 0, e = TL.getNumArgs(), tpi = 0; i != e; ++i) { 1640 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 1641 TL.setArg(tpi++, Param); 1642 } 1643 // FIXME: exception specs 1644 } 1645 1646 void VisitTypeLoc(TypeLoc TL) { 1647 llvm_unreachable("unsupported TypeLoc kind in declarator!"); 1648 } 1649 }; 1650} 1651 1652/// \brief Create and instantiate a TypeSourceInfo with type source information. 1653/// 1654/// \param T QualType referring to the type as written in source code. 1655/// 1656/// \param ReturnTypeInfo For declarators whose return type does not show 1657/// up in the normal place in the declaration specifiers (such as a C++ 1658/// conversion function), this pointer will refer to a type source information 1659/// for that return type. 1660TypeSourceInfo * 1661Sema::GetTypeSourceInfoForDeclarator(Declarator &D, QualType T, 1662 TypeSourceInfo *ReturnTypeInfo) { 1663 TypeSourceInfo *TInfo = Context.CreateTypeSourceInfo(T); 1664 UnqualTypeLoc CurrTL = TInfo->getTypeLoc().getUnqualifiedLoc(); 1665 1666 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 1667 DeclaratorLocFiller(D.getTypeObject(i)).Visit(CurrTL); 1668 CurrTL = CurrTL.getNextTypeLoc().getUnqualifiedLoc(); 1669 } 1670 1671 // If we have different source information for the return type, use 1672 // that. This really only applies to C++ conversion functions. 1673 if (ReturnTypeInfo) { 1674 TypeLoc TL = ReturnTypeInfo->getTypeLoc(); 1675 assert(TL.getFullDataSize() == CurrTL.getFullDataSize()); 1676 memcpy(CurrTL.getOpaqueData(), TL.getOpaqueData(), TL.getFullDataSize()); 1677 } else { 1678 TypeSpecLocFiller(D.getDeclSpec()).Visit(CurrTL); 1679 } 1680 1681 return TInfo; 1682} 1683 1684/// \brief Create a LocInfoType to hold the given QualType and TypeSourceInfo. 1685ParsedType Sema::CreateParsedType(QualType T, TypeSourceInfo *TInfo) { 1686 // FIXME: LocInfoTypes are "transient", only needed for passing to/from Parser 1687 // and Sema during declaration parsing. Try deallocating/caching them when 1688 // it's appropriate, instead of allocating them and keeping them around. 1689 LocInfoType *LocT = (LocInfoType*)BumpAlloc.Allocate(sizeof(LocInfoType), 8); 1690 new (LocT) LocInfoType(T, TInfo); 1691 assert(LocT->getTypeClass() != T->getTypeClass() && 1692 "LocInfoType's TypeClass conflicts with an existing Type class"); 1693 return ParsedType::make(QualType(LocT, 0)); 1694} 1695 1696void LocInfoType::getAsStringInternal(std::string &Str, 1697 const PrintingPolicy &Policy) const { 1698 assert(false && "LocInfoType leaked into the type system; an opaque TypeTy*" 1699 " was used directly instead of getting the QualType through" 1700 " GetTypeFromParser"); 1701} 1702 1703TypeResult Sema::ActOnTypeName(Scope *S, Declarator &D) { 1704 // C99 6.7.6: Type names have no identifier. This is already validated by 1705 // the parser. 1706 assert(D.getIdentifier() == 0 && "Type name should have no identifier!"); 1707 1708 TagDecl *OwnedTag = 0; 1709 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S, &OwnedTag); 1710 QualType T = TInfo->getType(); 1711 if (D.isInvalidType()) 1712 return true; 1713 1714 if (getLangOptions().CPlusPlus) { 1715 // Check that there are no default arguments (C++ only). 1716 CheckExtraCXXDefaultArguments(D); 1717 1718 // C++0x [dcl.type]p3: 1719 // A type-specifier-seq shall not define a class or enumeration 1720 // unless it appears in the type-id of an alias-declaration 1721 // (7.1.3). 1722 if (OwnedTag && OwnedTag->isDefinition()) 1723 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_type_specifier) 1724 << Context.getTypeDeclType(OwnedTag); 1725 } 1726 1727 return CreateParsedType(T, TInfo); 1728} 1729 1730 1731 1732//===----------------------------------------------------------------------===// 1733// Type Attribute Processing 1734//===----------------------------------------------------------------------===// 1735 1736/// HandleAddressSpaceTypeAttribute - Process an address_space attribute on the 1737/// specified type. The attribute contains 1 argument, the id of the address 1738/// space for the type. 1739static void HandleAddressSpaceTypeAttribute(QualType &Type, 1740 const AttributeList &Attr, Sema &S){ 1741 1742 // If this type is already address space qualified, reject it. 1743 // Clause 6.7.3 - Type qualifiers: "No type shall be qualified by qualifiers 1744 // for two or more different address spaces." 1745 if (Type.getAddressSpace()) { 1746 S.Diag(Attr.getLoc(), diag::err_attribute_address_multiple_qualifiers); 1747 Attr.setInvalid(); 1748 return; 1749 } 1750 1751 // Check the attribute arguments. 1752 if (Attr.getNumArgs() != 1) { 1753 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 1754 Attr.setInvalid(); 1755 return; 1756 } 1757 Expr *ASArgExpr = static_cast<Expr *>(Attr.getArg(0)); 1758 llvm::APSInt addrSpace(32); 1759 if (ASArgExpr->isTypeDependent() || ASArgExpr->isValueDependent() || 1760 !ASArgExpr->isIntegerConstantExpr(addrSpace, S.Context)) { 1761 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_not_int) 1762 << ASArgExpr->getSourceRange(); 1763 Attr.setInvalid(); 1764 return; 1765 } 1766 1767 // Bounds checking. 1768 if (addrSpace.isSigned()) { 1769 if (addrSpace.isNegative()) { 1770 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_negative) 1771 << ASArgExpr->getSourceRange(); 1772 Attr.setInvalid(); 1773 return; 1774 } 1775 addrSpace.setIsSigned(false); 1776 } 1777 llvm::APSInt max(addrSpace.getBitWidth()); 1778 max = Qualifiers::MaxAddressSpace; 1779 if (addrSpace > max) { 1780 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_too_high) 1781 << Qualifiers::MaxAddressSpace << ASArgExpr->getSourceRange(); 1782 Attr.setInvalid(); 1783 return; 1784 } 1785 1786 unsigned ASIdx = static_cast<unsigned>(addrSpace.getZExtValue()); 1787 Type = S.Context.getAddrSpaceQualType(Type, ASIdx); 1788} 1789 1790/// HandleObjCGCTypeAttribute - Process an objc's gc attribute on the 1791/// specified type. The attribute contains 1 argument, weak or strong. 1792static void HandleObjCGCTypeAttribute(QualType &Type, 1793 const AttributeList &Attr, Sema &S) { 1794 if (Type.getObjCGCAttr() != Qualifiers::GCNone) { 1795 S.Diag(Attr.getLoc(), diag::err_attribute_multiple_objc_gc); 1796 Attr.setInvalid(); 1797 return; 1798 } 1799 1800 // Check the attribute arguments. 1801 if (!Attr.getParameterName()) { 1802 S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_string) 1803 << "objc_gc" << 1; 1804 Attr.setInvalid(); 1805 return; 1806 } 1807 Qualifiers::GC GCAttr; 1808 if (Attr.getNumArgs() != 0) { 1809 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 1810 Attr.setInvalid(); 1811 return; 1812 } 1813 if (Attr.getParameterName()->isStr("weak")) 1814 GCAttr = Qualifiers::Weak; 1815 else if (Attr.getParameterName()->isStr("strong")) 1816 GCAttr = Qualifiers::Strong; 1817 else { 1818 S.Diag(Attr.getLoc(), diag::warn_attribute_type_not_supported) 1819 << "objc_gc" << Attr.getParameterName(); 1820 Attr.setInvalid(); 1821 return; 1822 } 1823 1824 Type = S.Context.getObjCGCQualType(Type, GCAttr); 1825} 1826 1827static QualType GetResultType(QualType T) { 1828 if (const PointerType *PT = T->getAs<PointerType>()) 1829 T = PT->getPointeeType(); 1830 else if (const BlockPointerType *BT = T->getAs<BlockPointerType>()) 1831 T = BT->getPointeeType(); 1832 return T->getAs<FunctionType>()->getResultType(); 1833} 1834 1835/// Process an individual function attribute. Returns true if the 1836/// attribute does not make sense to apply to this type. 1837bool ProcessFnAttr(Sema &S, QualType &Type, const AttributeList &Attr) { 1838 if (Attr.getKind() == AttributeList::AT_noreturn) { 1839 // Complain immediately if the arg count is wrong. 1840 if (Attr.getNumArgs() != 0) { 1841 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0; 1842 Attr.setInvalid(); 1843 return false; 1844 } 1845 1846 // Delay if this is not a function or pointer to block. 1847 if (!Type->isFunctionPointerType() 1848 && !Type->isBlockPointerType() 1849 && !Type->isFunctionType()) 1850 return true; 1851 1852 if (!GetResultType(Type)->isVoidType()) { 1853 S.Diag(Attr.getLoc(), diag::warn_noreturn_function_has_nonvoid_result) 1854 << (Type->isBlockPointerType() ? /* blocks */ 1 : /* functions */ 0); 1855 } 1856 1857 // Otherwise we can process right away. 1858 Type = S.Context.getNoReturnType(Type); 1859 return false; 1860 } 1861 1862 if (Attr.getKind() == AttributeList::AT_regparm) { 1863 // The warning is emitted elsewhere 1864 if (Attr.getNumArgs() != 1) { 1865 return false; 1866 } 1867 1868 // Delay if this is not a function or pointer to block. 1869 if (!Type->isFunctionPointerType() 1870 && !Type->isBlockPointerType() 1871 && !Type->isFunctionType()) 1872 return true; 1873 1874 // Otherwise we can process right away. 1875 Expr *NumParamsExpr = static_cast<Expr *>(Attr.getArg(0)); 1876 llvm::APSInt NumParams(32); 1877 1878 // The warning is emitted elsewhere 1879 if (NumParamsExpr->isTypeDependent() || NumParamsExpr->isValueDependent() || 1880 !NumParamsExpr->isIntegerConstantExpr(NumParams, S.Context)) 1881 return false; 1882 1883 Type = S.Context.getRegParmType(Type, NumParams.getZExtValue()); 1884 return false; 1885 } 1886 1887 // Otherwise, a calling convention. 1888 if (Attr.getNumArgs() != 0) { 1889 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0; 1890 Attr.setInvalid(); 1891 return false; 1892 } 1893 1894 QualType T = Type; 1895 if (const PointerType *PT = Type->getAs<PointerType>()) 1896 T = PT->getPointeeType(); 1897 const FunctionType *Fn = T->getAs<FunctionType>(); 1898 1899 // Delay if the type didn't work out to a function. 1900 if (!Fn) return true; 1901 1902 // TODO: diagnose uses of these conventions on the wrong target. 1903 CallingConv CC; 1904 switch (Attr.getKind()) { 1905 case AttributeList::AT_cdecl: CC = CC_C; break; 1906 case AttributeList::AT_fastcall: CC = CC_X86FastCall; break; 1907 case AttributeList::AT_stdcall: CC = CC_X86StdCall; break; 1908 case AttributeList::AT_thiscall: CC = CC_X86ThisCall; break; 1909 default: llvm_unreachable("unexpected attribute kind"); return false; 1910 } 1911 1912 CallingConv CCOld = Fn->getCallConv(); 1913 if (S.Context.getCanonicalCallConv(CC) == 1914 S.Context.getCanonicalCallConv(CCOld)) { 1915 Attr.setInvalid(); 1916 return false; 1917 } 1918 1919 if (CCOld != CC_Default) { 1920 // Should we diagnose reapplications of the same convention? 1921 S.Diag(Attr.getLoc(), diag::err_attributes_are_not_compatible) 1922 << FunctionType::getNameForCallConv(CC) 1923 << FunctionType::getNameForCallConv(CCOld); 1924 Attr.setInvalid(); 1925 return false; 1926 } 1927 1928 // Diagnose the use of X86 fastcall on varargs or unprototyped functions. 1929 if (CC == CC_X86FastCall) { 1930 if (isa<FunctionNoProtoType>(Fn)) { 1931 S.Diag(Attr.getLoc(), diag::err_cconv_knr) 1932 << FunctionType::getNameForCallConv(CC); 1933 Attr.setInvalid(); 1934 return false; 1935 } 1936 1937 const FunctionProtoType *FnP = cast<FunctionProtoType>(Fn); 1938 if (FnP->isVariadic()) { 1939 S.Diag(Attr.getLoc(), diag::err_cconv_varargs) 1940 << FunctionType::getNameForCallConv(CC); 1941 Attr.setInvalid(); 1942 return false; 1943 } 1944 } 1945 1946 Type = S.Context.getCallConvType(Type, CC); 1947 return false; 1948} 1949 1950/// HandleVectorSizeAttribute - this attribute is only applicable to integral 1951/// and float scalars, although arrays, pointers, and function return values are 1952/// allowed in conjunction with this construct. Aggregates with this attribute 1953/// are invalid, even if they are of the same size as a corresponding scalar. 1954/// The raw attribute should contain precisely 1 argument, the vector size for 1955/// the variable, measured in bytes. If curType and rawAttr are well formed, 1956/// this routine will return a new vector type. 1957static void HandleVectorSizeAttr(QualType& CurType, const AttributeList &Attr, 1958 Sema &S) { 1959 // Check the attribute arugments. 1960 if (Attr.getNumArgs() != 1) { 1961 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 1962 Attr.setInvalid(); 1963 return; 1964 } 1965 Expr *sizeExpr = static_cast<Expr *>(Attr.getArg(0)); 1966 llvm::APSInt vecSize(32); 1967 if (sizeExpr->isTypeDependent() || sizeExpr->isValueDependent() || 1968 !sizeExpr->isIntegerConstantExpr(vecSize, S.Context)) { 1969 S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int) 1970 << "vector_size" << sizeExpr->getSourceRange(); 1971 Attr.setInvalid(); 1972 return; 1973 } 1974 // the base type must be integer or float, and can't already be a vector. 1975 if (!CurType->isIntegerType() && !CurType->isRealFloatingType()) { 1976 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_vector_type) << CurType; 1977 Attr.setInvalid(); 1978 return; 1979 } 1980 unsigned typeSize = static_cast<unsigned>(S.Context.getTypeSize(CurType)); 1981 // vecSize is specified in bytes - convert to bits. 1982 unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue() * 8); 1983 1984 // the vector size needs to be an integral multiple of the type size. 1985 if (vectorSize % typeSize) { 1986 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_size) 1987 << sizeExpr->getSourceRange(); 1988 Attr.setInvalid(); 1989 return; 1990 } 1991 if (vectorSize == 0) { 1992 S.Diag(Attr.getLoc(), diag::err_attribute_zero_size) 1993 << sizeExpr->getSourceRange(); 1994 Attr.setInvalid(); 1995 return; 1996 } 1997 1998 // Success! Instantiate the vector type, the number of elements is > 0, and 1999 // not required to be a power of 2, unlike GCC. 2000 CurType = S.Context.getVectorType(CurType, vectorSize/typeSize, 2001 VectorType::NotAltiVec); 2002} 2003 2004void ProcessTypeAttributeList(Sema &S, QualType &Result, 2005 bool IsDeclSpec, const AttributeList *AL, 2006 DelayedAttributeSet &FnAttrs) { 2007 // Scan through and apply attributes to this type where it makes sense. Some 2008 // attributes (such as __address_space__, __vector_size__, etc) apply to the 2009 // type, but others can be present in the type specifiers even though they 2010 // apply to the decl. Here we apply type attributes and ignore the rest. 2011 for (; AL; AL = AL->getNext()) { 2012 // Skip attributes that were marked to be invalid. 2013 if (AL->isInvalid()) 2014 continue; 2015 2016 // If this is an attribute we can handle, do so now, 2017 // otherwise, add it to the FnAttrs list for rechaining. 2018 switch (AL->getKind()) { 2019 default: break; 2020 2021 case AttributeList::AT_address_space: 2022 HandleAddressSpaceTypeAttribute(Result, *AL, S); 2023 break; 2024 case AttributeList::AT_objc_gc: 2025 HandleObjCGCTypeAttribute(Result, *AL, S); 2026 break; 2027 case AttributeList::AT_vector_size: 2028 HandleVectorSizeAttr(Result, *AL, S); 2029 break; 2030 2031 case AttributeList::AT_noreturn: 2032 case AttributeList::AT_cdecl: 2033 case AttributeList::AT_fastcall: 2034 case AttributeList::AT_stdcall: 2035 case AttributeList::AT_thiscall: 2036 case AttributeList::AT_regparm: 2037 // Don't process these on the DeclSpec. 2038 if (IsDeclSpec || 2039 ProcessFnAttr(S, Result, *AL)) 2040 FnAttrs.push_back(DelayedAttribute(AL, Result)); 2041 break; 2042 } 2043 } 2044} 2045 2046/// @brief Ensure that the type T is a complete type. 2047/// 2048/// This routine checks whether the type @p T is complete in any 2049/// context where a complete type is required. If @p T is a complete 2050/// type, returns false. If @p T is a class template specialization, 2051/// this routine then attempts to perform class template 2052/// instantiation. If instantiation fails, or if @p T is incomplete 2053/// and cannot be completed, issues the diagnostic @p diag (giving it 2054/// the type @p T) and returns true. 2055/// 2056/// @param Loc The location in the source that the incomplete type 2057/// diagnostic should refer to. 2058/// 2059/// @param T The type that this routine is examining for completeness. 2060/// 2061/// @param PD The partial diagnostic that will be printed out if T is not a 2062/// complete type. 2063/// 2064/// @returns @c true if @p T is incomplete and a diagnostic was emitted, 2065/// @c false otherwise. 2066bool Sema::RequireCompleteType(SourceLocation Loc, QualType T, 2067 const PartialDiagnostic &PD, 2068 std::pair<SourceLocation, 2069 PartialDiagnostic> Note) { 2070 unsigned diag = PD.getDiagID(); 2071 2072 // FIXME: Add this assertion to make sure we always get instantiation points. 2073 // assert(!Loc.isInvalid() && "Invalid location in RequireCompleteType"); 2074 // FIXME: Add this assertion to help us flush out problems with 2075 // checking for dependent types and type-dependent expressions. 2076 // 2077 // assert(!T->isDependentType() && 2078 // "Can't ask whether a dependent type is complete"); 2079 2080 // If we have a complete type, we're done. 2081 if (!T->isIncompleteType()) 2082 return false; 2083 2084 // If we have a class template specialization or a class member of a 2085 // class template specialization, or an array with known size of such, 2086 // try to instantiate it. 2087 QualType MaybeTemplate = T; 2088 if (const ConstantArrayType *Array = Context.getAsConstantArrayType(T)) 2089 MaybeTemplate = Array->getElementType(); 2090 if (const RecordType *Record = MaybeTemplate->getAs<RecordType>()) { 2091 if (ClassTemplateSpecializationDecl *ClassTemplateSpec 2092 = dyn_cast<ClassTemplateSpecializationDecl>(Record->getDecl())) { 2093 if (ClassTemplateSpec->getSpecializationKind() == TSK_Undeclared) 2094 return InstantiateClassTemplateSpecialization(Loc, ClassTemplateSpec, 2095 TSK_ImplicitInstantiation, 2096 /*Complain=*/diag != 0); 2097 } else if (CXXRecordDecl *Rec 2098 = dyn_cast<CXXRecordDecl>(Record->getDecl())) { 2099 if (CXXRecordDecl *Pattern = Rec->getInstantiatedFromMemberClass()) { 2100 MemberSpecializationInfo *MSInfo = Rec->getMemberSpecializationInfo(); 2101 assert(MSInfo && "Missing member specialization information?"); 2102 // This record was instantiated from a class within a template. 2103 if (MSInfo->getTemplateSpecializationKind() 2104 != TSK_ExplicitSpecialization) 2105 return InstantiateClass(Loc, Rec, Pattern, 2106 getTemplateInstantiationArgs(Rec), 2107 TSK_ImplicitInstantiation, 2108 /*Complain=*/diag != 0); 2109 } 2110 } 2111 } 2112 2113 if (diag == 0) 2114 return true; 2115 2116 const TagType *Tag = 0; 2117 if (const RecordType *Record = T->getAs<RecordType>()) 2118 Tag = Record; 2119 else if (const EnumType *Enum = T->getAs<EnumType>()) 2120 Tag = Enum; 2121 2122 // Avoid diagnosing invalid decls as incomplete. 2123 if (Tag && Tag->getDecl()->isInvalidDecl()) 2124 return true; 2125 2126 // We have an incomplete type. Produce a diagnostic. 2127 Diag(Loc, PD) << T; 2128 2129 // If we have a note, produce it. 2130 if (!Note.first.isInvalid()) 2131 Diag(Note.first, Note.second); 2132 2133 // If the type was a forward declaration of a class/struct/union 2134 // type, produce a note. 2135 if (Tag && !Tag->getDecl()->isInvalidDecl()) 2136 Diag(Tag->getDecl()->getLocation(), 2137 Tag->isBeingDefined() ? diag::note_type_being_defined 2138 : diag::note_forward_declaration) 2139 << QualType(Tag, 0); 2140 2141 return true; 2142} 2143 2144bool Sema::RequireCompleteType(SourceLocation Loc, QualType T, 2145 const PartialDiagnostic &PD) { 2146 return RequireCompleteType(Loc, T, PD, 2147 std::make_pair(SourceLocation(), PDiag(0))); 2148} 2149 2150bool Sema::RequireCompleteType(SourceLocation Loc, QualType T, 2151 unsigned DiagID) { 2152 return RequireCompleteType(Loc, T, PDiag(DiagID), 2153 std::make_pair(SourceLocation(), PDiag(0))); 2154} 2155 2156/// \brief Retrieve a version of the type 'T' that is elaborated by Keyword 2157/// and qualified by the nested-name-specifier contained in SS. 2158QualType Sema::getElaboratedType(ElaboratedTypeKeyword Keyword, 2159 const CXXScopeSpec &SS, QualType T) { 2160 if (T.isNull()) 2161 return T; 2162 NestedNameSpecifier *NNS; 2163 if (SS.isValid()) 2164 NNS = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 2165 else { 2166 if (Keyword == ETK_None) 2167 return T; 2168 NNS = 0; 2169 } 2170 return Context.getElaboratedType(Keyword, NNS, T); 2171} 2172 2173QualType Sema::BuildTypeofExprType(Expr *E) { 2174 if (E->getType() == Context.OverloadTy) { 2175 // C++ [temp.arg.explicit]p3 allows us to resolve a template-id to a 2176 // function template specialization wherever deduction cannot occur. 2177 if (FunctionDecl *Specialization 2178 = ResolveSingleFunctionTemplateSpecialization(E)) { 2179 // The access doesn't really matter in this case. 2180 DeclAccessPair Found = DeclAccessPair::make(Specialization, 2181 Specialization->getAccess()); 2182 E = FixOverloadedFunctionReference(E, Found, Specialization); 2183 if (!E) 2184 return QualType(); 2185 } else { 2186 Diag(E->getLocStart(), 2187 diag::err_cannot_determine_declared_type_of_overloaded_function) 2188 << false << E->getSourceRange(); 2189 return QualType(); 2190 } 2191 } 2192 2193 return Context.getTypeOfExprType(E); 2194} 2195 2196QualType Sema::BuildDecltypeType(Expr *E) { 2197 if (E->getType() == Context.OverloadTy) { 2198 // C++ [temp.arg.explicit]p3 allows us to resolve a template-id to a 2199 // function template specialization wherever deduction cannot occur. 2200 if (FunctionDecl *Specialization 2201 = ResolveSingleFunctionTemplateSpecialization(E)) { 2202 // The access doesn't really matter in this case. 2203 DeclAccessPair Found = DeclAccessPair::make(Specialization, 2204 Specialization->getAccess()); 2205 E = FixOverloadedFunctionReference(E, Found, Specialization); 2206 if (!E) 2207 return QualType(); 2208 } else { 2209 Diag(E->getLocStart(), 2210 diag::err_cannot_determine_declared_type_of_overloaded_function) 2211 << true << E->getSourceRange(); 2212 return QualType(); 2213 } 2214 } 2215 2216 return Context.getDecltypeType(E); 2217} 2218