SemaType.cpp revision 15d9630eba7f91a984019b236cdd071c4da879d3
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 // FIXME: Imaginary. 396 if (DS.getTypeSpecComplex() == DeclSpec::TSC_imaginary) 397 TheSema.Diag(DS.getTypeSpecComplexLoc(), diag::err_imaginary_not_supported); 398 399 // See if there are any attributes on the declspec that apply to the type (as 400 // opposed to the decl). 401 if (const AttributeList *AL = DS.getAttributes()) 402 ProcessTypeAttributeList(TheSema, Result, true, AL, Delayed); 403 404 // Apply const/volatile/restrict qualifiers to T. 405 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 406 407 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 408 // or incomplete types shall not be restrict-qualified." C++ also allows 409 // restrict-qualified references. 410 if (TypeQuals & DeclSpec::TQ_restrict) { 411 if (Result->isAnyPointerType() || Result->isReferenceType()) { 412 QualType EltTy; 413 if (Result->isObjCObjectPointerType()) 414 EltTy = Result; 415 else 416 EltTy = Result->isPointerType() ? 417 Result->getAs<PointerType>()->getPointeeType() : 418 Result->getAs<ReferenceType>()->getPointeeType(); 419 420 // If we have a pointer or reference, the pointee must have an object 421 // incomplete type. 422 if (!EltTy->isIncompleteOrObjectType()) { 423 TheSema.Diag(DS.getRestrictSpecLoc(), 424 diag::err_typecheck_invalid_restrict_invalid_pointee) 425 << EltTy << DS.getSourceRange(); 426 TypeQuals &= ~DeclSpec::TQ_restrict; // Remove the restrict qualifier. 427 } 428 } else { 429 TheSema.Diag(DS.getRestrictSpecLoc(), 430 diag::err_typecheck_invalid_restrict_not_pointer) 431 << Result << DS.getSourceRange(); 432 TypeQuals &= ~DeclSpec::TQ_restrict; // Remove the restrict qualifier. 433 } 434 } 435 436 // Warn about CV qualifiers on functions: C99 6.7.3p8: "If the specification 437 // of a function type includes any type qualifiers, the behavior is 438 // undefined." 439 if (Result->isFunctionType() && TypeQuals) { 440 // Get some location to point at, either the C or V location. 441 SourceLocation Loc; 442 if (TypeQuals & DeclSpec::TQ_const) 443 Loc = DS.getConstSpecLoc(); 444 else if (TypeQuals & DeclSpec::TQ_volatile) 445 Loc = DS.getVolatileSpecLoc(); 446 else { 447 assert((TypeQuals & DeclSpec::TQ_restrict) && 448 "Has CVR quals but not C, V, or R?"); 449 Loc = DS.getRestrictSpecLoc(); 450 } 451 TheSema.Diag(Loc, diag::warn_typecheck_function_qualifiers) 452 << Result << DS.getSourceRange(); 453 } 454 455 // C++ [dcl.ref]p1: 456 // Cv-qualified references are ill-formed except when the 457 // cv-qualifiers are introduced through the use of a typedef 458 // (7.1.3) or of a template type argument (14.3), in which 459 // case the cv-qualifiers are ignored. 460 // FIXME: Shouldn't we be checking SCS_typedef here? 461 if (DS.getTypeSpecType() == DeclSpec::TST_typename && 462 TypeQuals && Result->isReferenceType()) { 463 TypeQuals &= ~DeclSpec::TQ_const; 464 TypeQuals &= ~DeclSpec::TQ_volatile; 465 } 466 467 Qualifiers Quals = Qualifiers::fromCVRMask(TypeQuals); 468 Result = Context.getQualifiedType(Result, Quals); 469 } 470 471 return Result; 472} 473 474static std::string getPrintableNameForEntity(DeclarationName Entity) { 475 if (Entity) 476 return Entity.getAsString(); 477 478 return "type name"; 479} 480 481QualType Sema::BuildQualifiedType(QualType T, SourceLocation Loc, 482 Qualifiers Qs) { 483 // Enforce C99 6.7.3p2: "Types other than pointer types derived from 484 // object or incomplete types shall not be restrict-qualified." 485 if (Qs.hasRestrict()) { 486 unsigned DiagID = 0; 487 QualType ProblemTy; 488 489 const Type *Ty = T->getCanonicalTypeInternal().getTypePtr(); 490 if (const ReferenceType *RTy = dyn_cast<ReferenceType>(Ty)) { 491 if (!RTy->getPointeeType()->isIncompleteOrObjectType()) { 492 DiagID = diag::err_typecheck_invalid_restrict_invalid_pointee; 493 ProblemTy = T->getAs<ReferenceType>()->getPointeeType(); 494 } 495 } else if (const PointerType *PTy = dyn_cast<PointerType>(Ty)) { 496 if (!PTy->getPointeeType()->isIncompleteOrObjectType()) { 497 DiagID = diag::err_typecheck_invalid_restrict_invalid_pointee; 498 ProblemTy = T->getAs<PointerType>()->getPointeeType(); 499 } 500 } else if (const MemberPointerType *PTy = dyn_cast<MemberPointerType>(Ty)) { 501 if (!PTy->getPointeeType()->isIncompleteOrObjectType()) { 502 DiagID = diag::err_typecheck_invalid_restrict_invalid_pointee; 503 ProblemTy = T->getAs<PointerType>()->getPointeeType(); 504 } 505 } else if (!Ty->isDependentType()) { 506 // FIXME: this deserves a proper diagnostic 507 DiagID = diag::err_typecheck_invalid_restrict_invalid_pointee; 508 ProblemTy = T; 509 } 510 511 if (DiagID) { 512 Diag(Loc, DiagID) << ProblemTy; 513 Qs.removeRestrict(); 514 } 515 } 516 517 return Context.getQualifiedType(T, Qs); 518} 519 520/// \brief Build a pointer type. 521/// 522/// \param T The type to which we'll be building a pointer. 523/// 524/// \param Loc The location of the entity whose type involves this 525/// pointer type or, if there is no such entity, the location of the 526/// type that will have pointer type. 527/// 528/// \param Entity The name of the entity that involves the pointer 529/// type, if known. 530/// 531/// \returns A suitable pointer type, if there are no 532/// errors. Otherwise, returns a NULL type. 533QualType Sema::BuildPointerType(QualType T, 534 SourceLocation Loc, DeclarationName Entity) { 535 if (T->isReferenceType()) { 536 // C++ 8.3.2p4: There shall be no ... pointers to references ... 537 Diag(Loc, diag::err_illegal_decl_pointer_to_reference) 538 << getPrintableNameForEntity(Entity) << T; 539 return QualType(); 540 } 541 542 assert(!T->isObjCObjectType() && "Should build ObjCObjectPointerType"); 543 544 // Build the pointer type. 545 return Context.getPointerType(T); 546} 547 548/// \brief Build a reference type. 549/// 550/// \param T The type to which we'll be building a reference. 551/// 552/// \param Loc The location of the entity whose type involves this 553/// reference type or, if there is no such entity, the location of the 554/// type that will have reference type. 555/// 556/// \param Entity The name of the entity that involves the reference 557/// type, if known. 558/// 559/// \returns A suitable reference type, if there are no 560/// errors. Otherwise, returns a NULL type. 561QualType Sema::BuildReferenceType(QualType T, bool SpelledAsLValue, 562 SourceLocation Loc, 563 DeclarationName Entity) { 564 bool LValueRef = SpelledAsLValue || T->getAs<LValueReferenceType>(); 565 566 // C++0x [dcl.typedef]p9: If a typedef TD names a type that is a 567 // reference to a type T, and attempt to create the type "lvalue 568 // reference to cv TD" creates the type "lvalue reference to T". 569 // We use the qualifiers (restrict or none) of the original reference, 570 // not the new ones. This is consistent with GCC. 571 572 // C++ [dcl.ref]p4: There shall be no references to references. 573 // 574 // According to C++ DR 106, references to references are only 575 // diagnosed when they are written directly (e.g., "int & &"), 576 // but not when they happen via a typedef: 577 // 578 // typedef int& intref; 579 // typedef intref& intref2; 580 // 581 // Parser::ParseDeclaratorInternal diagnoses the case where 582 // references are written directly; here, we handle the 583 // collapsing of references-to-references as described in C++ 584 // DR 106 and amended by C++ DR 540. 585 586 // C++ [dcl.ref]p1: 587 // A declarator that specifies the type "reference to cv void" 588 // is ill-formed. 589 if (T->isVoidType()) { 590 Diag(Loc, diag::err_reference_to_void); 591 return QualType(); 592 } 593 594 // Handle restrict on references. 595 if (LValueRef) 596 return Context.getLValueReferenceType(T, SpelledAsLValue); 597 return Context.getRValueReferenceType(T); 598} 599 600/// \brief Build an array type. 601/// 602/// \param T The type of each element in the array. 603/// 604/// \param ASM C99 array size modifier (e.g., '*', 'static'). 605/// 606/// \param ArraySize Expression describing the size of the array. 607/// 608/// \param Loc The location of the entity whose type involves this 609/// array type or, if there is no such entity, the location of the 610/// type that will have array type. 611/// 612/// \param Entity The name of the entity that involves the array 613/// type, if known. 614/// 615/// \returns A suitable array type, if there are no errors. Otherwise, 616/// returns a NULL type. 617QualType Sema::BuildArrayType(QualType T, ArrayType::ArraySizeModifier ASM, 618 Expr *ArraySize, unsigned Quals, 619 SourceRange Brackets, DeclarationName Entity) { 620 621 SourceLocation Loc = Brackets.getBegin(); 622 if (getLangOptions().CPlusPlus) { 623 // C++ [dcl.array]p1: 624 // T is called the array element type; this type shall not be a reference 625 // type, the (possibly cv-qualified) type void, a function type or an 626 // abstract class type. 627 // 628 // Note: function types are handled in the common path with C. 629 if (T->isReferenceType()) { 630 Diag(Loc, diag::err_illegal_decl_array_of_references) 631 << getPrintableNameForEntity(Entity) << T; 632 return QualType(); 633 } 634 635 if (T->isVoidType()) { 636 Diag(Loc, diag::err_illegal_decl_array_incomplete_type) << T; 637 return QualType(); 638 } 639 640 if (RequireNonAbstractType(Brackets.getBegin(), T, 641 diag::err_array_of_abstract_type)) 642 return QualType(); 643 644 } else { 645 // C99 6.7.5.2p1: If the element type is an incomplete or function type, 646 // reject it (e.g. void ary[7], struct foo ary[7], void ary[7]()) 647 if (RequireCompleteType(Loc, T, 648 diag::err_illegal_decl_array_incomplete_type)) 649 return QualType(); 650 } 651 652 if (T->isFunctionType()) { 653 Diag(Loc, diag::err_illegal_decl_array_of_functions) 654 << getPrintableNameForEntity(Entity) << T; 655 return QualType(); 656 } 657 658 if (Context.getCanonicalType(T) == Context.UndeducedAutoTy) { 659 Diag(Loc, diag::err_illegal_decl_array_of_auto) 660 << getPrintableNameForEntity(Entity); 661 return QualType(); 662 } 663 664 if (const RecordType *EltTy = T->getAs<RecordType>()) { 665 // If the element type is a struct or union that contains a variadic 666 // array, accept it as a GNU extension: C99 6.7.2.1p2. 667 if (EltTy->getDecl()->hasFlexibleArrayMember()) 668 Diag(Loc, diag::ext_flexible_array_in_array) << T; 669 } else if (T->isObjCObjectType()) { 670 Diag(Loc, diag::err_objc_array_of_interfaces) << T; 671 return QualType(); 672 } 673 674 // C99 6.7.5.2p1: The size expression shall have integer type. 675 if (ArraySize && !ArraySize->isTypeDependent() && 676 !ArraySize->getType()->isIntegerType()) { 677 Diag(ArraySize->getLocStart(), diag::err_array_size_non_int) 678 << ArraySize->getType() << ArraySize->getSourceRange(); 679 return QualType(); 680 } 681 llvm::APSInt ConstVal(Context.getTypeSize(Context.getSizeType())); 682 if (!ArraySize) { 683 if (ASM == ArrayType::Star) 684 T = Context.getVariableArrayType(T, 0, ASM, Quals, Brackets); 685 else 686 T = Context.getIncompleteArrayType(T, ASM, Quals); 687 } else if (ArraySize->isTypeDependent() || ArraySize->isValueDependent()) { 688 T = Context.getDependentSizedArrayType(T, ArraySize, ASM, Quals, Brackets); 689 } else if (!ArraySize->isIntegerConstantExpr(ConstVal, Context) || 690 (!T->isDependentType() && !T->isIncompleteType() && 691 !T->isConstantSizeType())) { 692 // Per C99, a variable array is an array with either a non-constant 693 // size or an element type that has a non-constant-size 694 T = Context.getVariableArrayType(T, ArraySize, ASM, Quals, Brackets); 695 } else { 696 // C99 6.7.5.2p1: If the expression is a constant expression, it shall 697 // have a value greater than zero. 698 if (ConstVal.isSigned() && ConstVal.isNegative()) { 699 Diag(ArraySize->getLocStart(), 700 diag::err_typecheck_negative_array_size) 701 << ArraySize->getSourceRange(); 702 return QualType(); 703 } 704 if (ConstVal == 0) { 705 // GCC accepts zero sized static arrays. We allow them when 706 // we're not in a SFINAE context. 707 Diag(ArraySize->getLocStart(), 708 isSFINAEContext()? diag::err_typecheck_zero_array_size 709 : diag::ext_typecheck_zero_array_size) 710 << ArraySize->getSourceRange(); 711 } else if (!T->isDependentType() && !T->isVariablyModifiedType() && 712 !T->isIncompleteType()) { 713 // Is the array too large? 714 unsigned ActiveSizeBits 715 = ConstantArrayType::getNumAddressingBits(Context, T, ConstVal); 716 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) 717 Diag(ArraySize->getLocStart(), diag::err_array_too_large) 718 << ConstVal.toString(10) 719 << ArraySize->getSourceRange(); 720 } 721 722 T = Context.getConstantArrayType(T, ConstVal, ASM, Quals); 723 } 724 // If this is not C99, extwarn about VLA's and C99 array size modifiers. 725 if (!getLangOptions().C99) { 726 if (T->isVariableArrayType()) { 727 // Prohibit the use of non-POD types in VLAs. 728 if (!T->isDependentType() && 729 !Context.getBaseElementType(T)->isPODType()) { 730 Diag(Loc, diag::err_vla_non_pod) 731 << Context.getBaseElementType(T); 732 return QualType(); 733 } 734 // Prohibit the use of VLAs during template argument deduction. 735 else if (isSFINAEContext()) { 736 Diag(Loc, diag::err_vla_in_sfinae); 737 return QualType(); 738 } 739 // Just extwarn about VLAs. 740 else 741 Diag(Loc, diag::ext_vla); 742 } else if (ASM != ArrayType::Normal || Quals != 0) 743 Diag(Loc, 744 getLangOptions().CPlusPlus? diag::err_c99_array_usage_cxx 745 : diag::ext_c99_array_usage); 746 } 747 748 return T; 749} 750 751/// \brief Build an ext-vector type. 752/// 753/// Run the required checks for the extended vector type. 754QualType Sema::BuildExtVectorType(QualType T, Expr *ArraySize, 755 SourceLocation AttrLoc) { 756 // unlike gcc's vector_size attribute, we do not allow vectors to be defined 757 // in conjunction with complex types (pointers, arrays, functions, etc.). 758 if (!T->isDependentType() && 759 !T->isIntegerType() && !T->isRealFloatingType()) { 760 Diag(AttrLoc, diag::err_attribute_invalid_vector_type) << T; 761 return QualType(); 762 } 763 764 if (!ArraySize->isTypeDependent() && !ArraySize->isValueDependent()) { 765 llvm::APSInt vecSize(32); 766 if (!ArraySize->isIntegerConstantExpr(vecSize, Context)) { 767 Diag(AttrLoc, diag::err_attribute_argument_not_int) 768 << "ext_vector_type" << ArraySize->getSourceRange(); 769 return QualType(); 770 } 771 772 // unlike gcc's vector_size attribute, the size is specified as the 773 // number of elements, not the number of bytes. 774 unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue()); 775 776 if (vectorSize == 0) { 777 Diag(AttrLoc, diag::err_attribute_zero_size) 778 << ArraySize->getSourceRange(); 779 return QualType(); 780 } 781 782 if (!T->isDependentType()) 783 return Context.getExtVectorType(T, vectorSize); 784 } 785 786 return Context.getDependentSizedExtVectorType(T, ArraySize, AttrLoc); 787} 788 789/// \brief Build a function type. 790/// 791/// This routine checks the function type according to C++ rules and 792/// under the assumption that the result type and parameter types have 793/// just been instantiated from a template. It therefore duplicates 794/// some of the behavior of GetTypeForDeclarator, but in a much 795/// simpler form that is only suitable for this narrow use case. 796/// 797/// \param T The return type of the function. 798/// 799/// \param ParamTypes The parameter types of the function. This array 800/// will be modified to account for adjustments to the types of the 801/// function parameters. 802/// 803/// \param NumParamTypes The number of parameter types in ParamTypes. 804/// 805/// \param Variadic Whether this is a variadic function type. 806/// 807/// \param Quals The cvr-qualifiers to be applied to the function type. 808/// 809/// \param Loc The location of the entity whose type involves this 810/// function type or, if there is no such entity, the location of the 811/// type that will have function type. 812/// 813/// \param Entity The name of the entity that involves the function 814/// type, if known. 815/// 816/// \returns A suitable function type, if there are no 817/// errors. Otherwise, returns a NULL type. 818QualType Sema::BuildFunctionType(QualType T, 819 QualType *ParamTypes, 820 unsigned NumParamTypes, 821 bool Variadic, unsigned Quals, 822 SourceLocation Loc, DeclarationName Entity, 823 const FunctionType::ExtInfo &Info) { 824 if (T->isArrayType() || T->isFunctionType()) { 825 Diag(Loc, diag::err_func_returning_array_function) 826 << T->isFunctionType() << T; 827 return QualType(); 828 } 829 830 bool Invalid = false; 831 for (unsigned Idx = 0; Idx < NumParamTypes; ++Idx) { 832 QualType ParamType = adjustParameterType(ParamTypes[Idx]); 833 if (ParamType->isVoidType()) { 834 Diag(Loc, diag::err_param_with_void_type); 835 Invalid = true; 836 } 837 838 ParamTypes[Idx] = ParamType; 839 } 840 841 if (Invalid) 842 return QualType(); 843 844 return Context.getFunctionType(T, ParamTypes, NumParamTypes, Variadic, 845 Quals, false, false, 0, 0, Info); 846} 847 848/// \brief Build a member pointer type \c T Class::*. 849/// 850/// \param T the type to which the member pointer refers. 851/// \param Class the class type into which the member pointer points. 852/// \param CVR Qualifiers applied to the member pointer type 853/// \param Loc the location where this type begins 854/// \param Entity the name of the entity that will have this member pointer type 855/// 856/// \returns a member pointer type, if successful, or a NULL type if there was 857/// an error. 858QualType Sema::BuildMemberPointerType(QualType T, QualType Class, 859 SourceLocation Loc, 860 DeclarationName Entity) { 861 // Verify that we're not building a pointer to pointer to function with 862 // exception specification. 863 if (CheckDistantExceptionSpec(T)) { 864 Diag(Loc, diag::err_distant_exception_spec); 865 866 // FIXME: If we're doing this as part of template instantiation, 867 // we should return immediately. 868 869 // Build the type anyway, but use the canonical type so that the 870 // exception specifiers are stripped off. 871 T = Context.getCanonicalType(T); 872 } 873 874 // C++ 8.3.3p3: A pointer to member shall not point to ... a member 875 // with reference type, or "cv void." 876 if (T->isReferenceType()) { 877 Diag(Loc, diag::err_illegal_decl_mempointer_to_reference) 878 << (Entity? Entity.getAsString() : "type name") << T; 879 return QualType(); 880 } 881 882 if (T->isVoidType()) { 883 Diag(Loc, diag::err_illegal_decl_mempointer_to_void) 884 << (Entity? Entity.getAsString() : "type name"); 885 return QualType(); 886 } 887 888 if (!Class->isDependentType() && !Class->isRecordType()) { 889 Diag(Loc, diag::err_mempointer_in_nonclass_type) << Class; 890 return QualType(); 891 } 892 893 // In the Microsoft ABI, the class is allowed to be an incomplete 894 // type. In such cases, the compiler makes a worst-case assumption. 895 // We make no such assumption right now, so emit an error if the 896 // class isn't a complete type. 897 if (Context.Target.getCXXABI() == CXXABI_Microsoft && 898 RequireCompleteType(Loc, Class, diag::err_incomplete_type)) 899 return QualType(); 900 901 return Context.getMemberPointerType(T, Class.getTypePtr()); 902} 903 904/// \brief Build a block pointer type. 905/// 906/// \param T The type to which we'll be building a block pointer. 907/// 908/// \param CVR The cvr-qualifiers to be applied to the block pointer type. 909/// 910/// \param Loc The location of the entity whose type involves this 911/// block pointer type or, if there is no such entity, the location of the 912/// type that will have block pointer type. 913/// 914/// \param Entity The name of the entity that involves the block pointer 915/// type, if known. 916/// 917/// \returns A suitable block pointer type, if there are no 918/// errors. Otherwise, returns a NULL type. 919QualType Sema::BuildBlockPointerType(QualType T, 920 SourceLocation Loc, 921 DeclarationName Entity) { 922 if (!T->isFunctionType()) { 923 Diag(Loc, diag::err_nonfunction_block_type); 924 return QualType(); 925 } 926 927 return Context.getBlockPointerType(T); 928} 929 930QualType Sema::GetTypeFromParser(ParsedType Ty, TypeSourceInfo **TInfo) { 931 QualType QT = Ty.get(); 932 if (QT.isNull()) { 933 if (TInfo) *TInfo = 0; 934 return QualType(); 935 } 936 937 TypeSourceInfo *DI = 0; 938 if (LocInfoType *LIT = dyn_cast<LocInfoType>(QT)) { 939 QT = LIT->getType(); 940 DI = LIT->getTypeSourceInfo(); 941 } 942 943 if (TInfo) *TInfo = DI; 944 return QT; 945} 946 947/// GetTypeForDeclarator - Convert the type for the specified 948/// declarator to Type instances. 949/// 950/// If OwnedDecl is non-NULL, and this declarator's decl-specifier-seq 951/// owns the declaration of a type (e.g., the definition of a struct 952/// type), then *OwnedDecl will receive the owned declaration. 953/// 954/// The result of this call will never be null, but the associated 955/// type may be a null type if there's an unrecoverable error. 956TypeSourceInfo *Sema::GetTypeForDeclarator(Declarator &D, Scope *S, 957 TagDecl **OwnedDecl) { 958 // Determine the type of the declarator. Not all forms of declarator 959 // have a type. 960 QualType T; 961 TypeSourceInfo *ReturnTypeInfo = 0; 962 963 llvm::SmallVector<DelayedAttribute,4> FnAttrsFromDeclSpec; 964 965 switch (D.getName().getKind()) { 966 case UnqualifiedId::IK_Identifier: 967 case UnqualifiedId::IK_OperatorFunctionId: 968 case UnqualifiedId::IK_LiteralOperatorId: 969 case UnqualifiedId::IK_TemplateId: 970 T = ConvertDeclSpecToType(*this, D, FnAttrsFromDeclSpec); 971 972 if (!D.isInvalidType() && D.getDeclSpec().isTypeSpecOwned()) { 973 TagDecl* Owned = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 974 // Owned is embedded if it was defined here, or if it is the 975 // very first (i.e., canonical) declaration of this tag type. 976 Owned->setEmbeddedInDeclarator(Owned->isDefinition() || 977 Owned->isCanonicalDecl()); 978 if (OwnedDecl) *OwnedDecl = Owned; 979 } 980 break; 981 982 case UnqualifiedId::IK_ConstructorName: 983 case UnqualifiedId::IK_ConstructorTemplateId: 984 case UnqualifiedId::IK_DestructorName: 985 // Constructors and destructors don't have return types. Use 986 // "void" instead. 987 T = Context.VoidTy; 988 break; 989 990 case UnqualifiedId::IK_ConversionFunctionId: 991 // The result type of a conversion function is the type that it 992 // converts to. 993 T = GetTypeFromParser(D.getName().ConversionFunctionId, 994 &ReturnTypeInfo); 995 break; 996 } 997 998 // Check for auto functions and trailing return type and adjust the 999 // return type accordingly. 1000 if (getLangOptions().CPlusPlus0x && D.isFunctionDeclarator()) { 1001 const DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1002 if (T == Context.UndeducedAutoTy) { 1003 if (FTI.TrailingReturnType) { 1004 T = GetTypeFromParser(ParsedType::getFromOpaquePtr(FTI.TrailingReturnType), 1005 &ReturnTypeInfo); 1006 } 1007 else { 1008 Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 1009 diag::err_auto_missing_trailing_return); 1010 T = Context.IntTy; 1011 D.setInvalidType(true); 1012 } 1013 } 1014 else if (FTI.TrailingReturnType) { 1015 Diag(D.getDeclSpec().getTypeSpecTypeLoc(), 1016 diag::err_trailing_return_without_auto); 1017 D.setInvalidType(true); 1018 } 1019 } 1020 1021 if (T.isNull()) 1022 return Context.getNullTypeSourceInfo(); 1023 1024 if (T == Context.UndeducedAutoTy) { 1025 int Error = -1; 1026 1027 switch (D.getContext()) { 1028 case Declarator::KNRTypeListContext: 1029 assert(0 && "K&R type lists aren't allowed in C++"); 1030 break; 1031 case Declarator::PrototypeContext: 1032 Error = 0; // Function prototype 1033 break; 1034 case Declarator::MemberContext: 1035 switch (cast<TagDecl>(CurContext)->getTagKind()) { 1036 case TTK_Enum: assert(0 && "unhandled tag kind"); break; 1037 case TTK_Struct: Error = 1; /* Struct member */ break; 1038 case TTK_Union: Error = 2; /* Union member */ break; 1039 case TTK_Class: Error = 3; /* Class member */ break; 1040 } 1041 break; 1042 case Declarator::CXXCatchContext: 1043 Error = 4; // Exception declaration 1044 break; 1045 case Declarator::TemplateParamContext: 1046 Error = 5; // Template parameter 1047 break; 1048 case Declarator::BlockLiteralContext: 1049 Error = 6; // Block literal 1050 break; 1051 case Declarator::FileContext: 1052 case Declarator::BlockContext: 1053 case Declarator::ForContext: 1054 case Declarator::ConditionContext: 1055 case Declarator::TypeNameContext: 1056 break; 1057 } 1058 1059 if (Error != -1) { 1060 Diag(D.getDeclSpec().getTypeSpecTypeLoc(), diag::err_auto_not_allowed) 1061 << Error; 1062 T = Context.IntTy; 1063 D.setInvalidType(true); 1064 } 1065 } 1066 1067 // The name we're declaring, if any. 1068 DeclarationName Name; 1069 if (D.getIdentifier()) 1070 Name = D.getIdentifier(); 1071 1072 llvm::SmallVector<DelayedAttribute,4> FnAttrsFromPreviousChunk; 1073 1074 // Walk the DeclTypeInfo, building the recursive type as we go. 1075 // DeclTypeInfos are ordered from the identifier out, which is 1076 // opposite of what we want :). 1077 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 1078 DeclaratorChunk &DeclType = D.getTypeObject(e-i-1); 1079 switch (DeclType.Kind) { 1080 default: assert(0 && "Unknown decltype!"); 1081 case DeclaratorChunk::BlockPointer: 1082 // If blocks are disabled, emit an error. 1083 if (!LangOpts.Blocks) 1084 Diag(DeclType.Loc, diag::err_blocks_disable); 1085 1086 T = BuildBlockPointerType(T, D.getIdentifierLoc(), Name); 1087 if (DeclType.Cls.TypeQuals) 1088 T = BuildQualifiedType(T, DeclType.Loc, DeclType.Cls.TypeQuals); 1089 break; 1090 case DeclaratorChunk::Pointer: 1091 // Verify that we're not building a pointer to pointer to function with 1092 // exception specification. 1093 if (getLangOptions().CPlusPlus && CheckDistantExceptionSpec(T)) { 1094 Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 1095 D.setInvalidType(true); 1096 // Build the type anyway. 1097 } 1098 if (getLangOptions().ObjC1 && T->getAs<ObjCObjectType>()) { 1099 T = Context.getObjCObjectPointerType(T); 1100 if (DeclType.Ptr.TypeQuals) 1101 T = BuildQualifiedType(T, DeclType.Loc, DeclType.Ptr.TypeQuals); 1102 break; 1103 } 1104 T = BuildPointerType(T, DeclType.Loc, Name); 1105 if (DeclType.Ptr.TypeQuals) 1106 T = BuildQualifiedType(T, DeclType.Loc, DeclType.Ptr.TypeQuals); 1107 break; 1108 case DeclaratorChunk::Reference: { 1109 // Verify that we're not building a reference to pointer to function with 1110 // exception specification. 1111 if (getLangOptions().CPlusPlus && CheckDistantExceptionSpec(T)) { 1112 Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 1113 D.setInvalidType(true); 1114 // Build the type anyway. 1115 } 1116 T = BuildReferenceType(T, DeclType.Ref.LValueRef, DeclType.Loc, Name); 1117 1118 Qualifiers Quals; 1119 if (DeclType.Ref.HasRestrict) 1120 T = BuildQualifiedType(T, DeclType.Loc, Qualifiers::Restrict); 1121 break; 1122 } 1123 case DeclaratorChunk::Array: { 1124 // Verify that we're not building an array of pointers to function with 1125 // exception specification. 1126 if (getLangOptions().CPlusPlus && CheckDistantExceptionSpec(T)) { 1127 Diag(D.getIdentifierLoc(), diag::err_distant_exception_spec); 1128 D.setInvalidType(true); 1129 // Build the type anyway. 1130 } 1131 DeclaratorChunk::ArrayTypeInfo &ATI = DeclType.Arr; 1132 Expr *ArraySize = static_cast<Expr*>(ATI.NumElts); 1133 ArrayType::ArraySizeModifier ASM; 1134 if (ATI.isStar) 1135 ASM = ArrayType::Star; 1136 else if (ATI.hasStatic) 1137 ASM = ArrayType::Static; 1138 else 1139 ASM = ArrayType::Normal; 1140 if (ASM == ArrayType::Star && 1141 D.getContext() != Declarator::PrototypeContext) { 1142 // FIXME: This check isn't quite right: it allows star in prototypes 1143 // for function definitions, and disallows some edge cases detailed 1144 // in http://gcc.gnu.org/ml/gcc-patches/2009-02/msg00133.html 1145 Diag(DeclType.Loc, diag::err_array_star_outside_prototype); 1146 ASM = ArrayType::Normal; 1147 D.setInvalidType(true); 1148 } 1149 T = BuildArrayType(T, ASM, ArraySize, 1150 Qualifiers::fromCVRMask(ATI.TypeQuals), 1151 SourceRange(DeclType.Loc, DeclType.EndLoc), Name); 1152 break; 1153 } 1154 case DeclaratorChunk::Function: { 1155 // If the function declarator has a prototype (i.e. it is not () and 1156 // does not have a K&R-style identifier list), then the arguments are part 1157 // of the type, otherwise the argument list is (). 1158 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun; 1159 1160 // C99 6.7.5.3p1: The return type may not be a function or array type. 1161 // For conversion functions, we'll diagnose this particular error later. 1162 if ((T->isArrayType() || T->isFunctionType()) && 1163 (D.getName().getKind() != UnqualifiedId::IK_ConversionFunctionId)) { 1164 Diag(DeclType.Loc, diag::err_func_returning_array_function) 1165 << T->isFunctionType() << T; 1166 T = Context.IntTy; 1167 D.setInvalidType(true); 1168 } 1169 1170 // cv-qualifiers on return types are pointless except when the type is a 1171 // class type in C++. 1172 if (T.getCVRQualifiers() && D.getDeclSpec().getTypeQualifiers() && 1173 (!getLangOptions().CPlusPlus || 1174 (!T->isDependentType() && !T->isRecordType()))) { 1175 unsigned Quals = D.getDeclSpec().getTypeQualifiers(); 1176 std::string QualStr; 1177 unsigned NumQuals = 0; 1178 SourceLocation Loc; 1179 if (Quals & Qualifiers::Const) { 1180 Loc = D.getDeclSpec().getConstSpecLoc(); 1181 ++NumQuals; 1182 QualStr = "const"; 1183 } 1184 if (Quals & Qualifiers::Volatile) { 1185 if (NumQuals == 0) { 1186 Loc = D.getDeclSpec().getVolatileSpecLoc(); 1187 QualStr = "volatile"; 1188 } else 1189 QualStr += " volatile"; 1190 ++NumQuals; 1191 } 1192 if (Quals & Qualifiers::Restrict) { 1193 if (NumQuals == 0) { 1194 Loc = D.getDeclSpec().getRestrictSpecLoc(); 1195 QualStr = "restrict"; 1196 } else 1197 QualStr += " restrict"; 1198 ++NumQuals; 1199 } 1200 assert(NumQuals > 0 && "No known qualifiers?"); 1201 1202 SemaDiagnosticBuilder DB = Diag(Loc, diag::warn_qual_return_type); 1203 DB << QualStr << NumQuals; 1204 if (Quals & Qualifiers::Const) 1205 DB << FixItHint::CreateRemoval(D.getDeclSpec().getConstSpecLoc()); 1206 if (Quals & Qualifiers::Volatile) 1207 DB << FixItHint::CreateRemoval(D.getDeclSpec().getVolatileSpecLoc()); 1208 if (Quals & Qualifiers::Restrict) 1209 DB << FixItHint::CreateRemoval(D.getDeclSpec().getRestrictSpecLoc()); 1210 } 1211 1212 if (getLangOptions().CPlusPlus && D.getDeclSpec().isTypeSpecOwned()) { 1213 // C++ [dcl.fct]p6: 1214 // Types shall not be defined in return or parameter types. 1215 TagDecl *Tag = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 1216 if (Tag->isDefinition()) 1217 Diag(Tag->getLocation(), diag::err_type_defined_in_result_type) 1218 << Context.getTypeDeclType(Tag); 1219 } 1220 1221 // Exception specs are not allowed in typedefs. Complain, but add it 1222 // anyway. 1223 if (FTI.hasExceptionSpec && 1224 D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 1225 Diag(FTI.getThrowLoc(), diag::err_exception_spec_in_typedef); 1226 1227 if (!FTI.NumArgs && !FTI.isVariadic && !getLangOptions().CPlusPlus) { 1228 // Simple void foo(), where the incoming T is the result type. 1229 T = Context.getFunctionNoProtoType(T); 1230 } else { 1231 // We allow a zero-parameter variadic function in C if the 1232 // function is marked with the "overloadable" attribute. Scan 1233 // for this attribute now. 1234 if (!FTI.NumArgs && FTI.isVariadic && !getLangOptions().CPlusPlus) { 1235 bool Overloadable = false; 1236 for (const AttributeList *Attrs = D.getAttributes(); 1237 Attrs; Attrs = Attrs->getNext()) { 1238 if (Attrs->getKind() == AttributeList::AT_overloadable) { 1239 Overloadable = true; 1240 break; 1241 } 1242 } 1243 1244 if (!Overloadable) 1245 Diag(FTI.getEllipsisLoc(), diag::err_ellipsis_first_arg); 1246 } 1247 1248 if (FTI.NumArgs && FTI.ArgInfo[0].Param == 0) { 1249 // C99 6.7.5.3p3: Reject int(x,y,z) when it's not a function 1250 // definition. 1251 Diag(FTI.ArgInfo[0].IdentLoc, diag::err_ident_list_in_fn_declaration); 1252 D.setInvalidType(true); 1253 break; 1254 } 1255 1256 // Otherwise, we have a function with an argument list that is 1257 // potentially variadic. 1258 llvm::SmallVector<QualType, 16> ArgTys; 1259 ArgTys.reserve(FTI.NumArgs); 1260 1261 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 1262 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 1263 QualType ArgTy = Param->getType(); 1264 assert(!ArgTy.isNull() && "Couldn't parse type?"); 1265 1266 // Adjust the parameter type. 1267 assert((ArgTy == adjustParameterType(ArgTy)) && "Unadjusted type?"); 1268 1269 // Look for 'void'. void is allowed only as a single argument to a 1270 // function with no other parameters (C99 6.7.5.3p10). We record 1271 // int(void) as a FunctionProtoType with an empty argument list. 1272 if (ArgTy->isVoidType()) { 1273 // If this is something like 'float(int, void)', reject it. 'void' 1274 // is an incomplete type (C99 6.2.5p19) and function decls cannot 1275 // have arguments of incomplete type. 1276 if (FTI.NumArgs != 1 || FTI.isVariadic) { 1277 Diag(DeclType.Loc, diag::err_void_only_param); 1278 ArgTy = Context.IntTy; 1279 Param->setType(ArgTy); 1280 } else if (FTI.ArgInfo[i].Ident) { 1281 // Reject, but continue to parse 'int(void abc)'. 1282 Diag(FTI.ArgInfo[i].IdentLoc, 1283 diag::err_param_with_void_type); 1284 ArgTy = Context.IntTy; 1285 Param->setType(ArgTy); 1286 } else { 1287 // Reject, but continue to parse 'float(const void)'. 1288 if (ArgTy.hasQualifiers()) 1289 Diag(DeclType.Loc, diag::err_void_param_qualified); 1290 1291 // Do not add 'void' to the ArgTys list. 1292 break; 1293 } 1294 } else if (!FTI.hasPrototype) { 1295 if (ArgTy->isPromotableIntegerType()) { 1296 ArgTy = Context.getPromotedIntegerType(ArgTy); 1297 } else if (const BuiltinType* BTy = ArgTy->getAs<BuiltinType>()) { 1298 if (BTy->getKind() == BuiltinType::Float) 1299 ArgTy = Context.DoubleTy; 1300 } 1301 } 1302 1303 ArgTys.push_back(ArgTy); 1304 } 1305 1306 llvm::SmallVector<QualType, 4> Exceptions; 1307 Exceptions.reserve(FTI.NumExceptions); 1308 for (unsigned ei = 0, ee = FTI.NumExceptions; ei != ee; ++ei) { 1309 // FIXME: Preserve type source info. 1310 QualType ET = GetTypeFromParser(FTI.Exceptions[ei].Ty); 1311 // Check that the type is valid for an exception spec, and drop it if 1312 // not. 1313 if (!CheckSpecifiedExceptionType(ET, FTI.Exceptions[ei].Range)) 1314 Exceptions.push_back(ET); 1315 } 1316 1317 T = Context.getFunctionType(T, ArgTys.data(), ArgTys.size(), 1318 FTI.isVariadic, FTI.TypeQuals, 1319 FTI.hasExceptionSpec, 1320 FTI.hasAnyExceptionSpec, 1321 Exceptions.size(), Exceptions.data(), 1322 FunctionType::ExtInfo()); 1323 } 1324 1325 // For GCC compatibility, we allow attributes that apply only to 1326 // function types to be placed on a function's return type 1327 // instead (as long as that type doesn't happen to be function 1328 // or function-pointer itself). 1329 ProcessDelayedFnAttrs(*this, T, FnAttrsFromPreviousChunk); 1330 1331 break; 1332 } 1333 case DeclaratorChunk::MemberPointer: 1334 // The scope spec must refer to a class, or be dependent. 1335 CXXScopeSpec &SS = DeclType.Mem.Scope(); 1336 QualType ClsType; 1337 if (SS.isInvalid()) { 1338 // Avoid emitting extra errors if we already errored on the scope. 1339 D.setInvalidType(true); 1340 } else if (isDependentScopeSpecifier(SS) || 1341 dyn_cast_or_null<CXXRecordDecl>(computeDeclContext(SS))) { 1342 NestedNameSpecifier *NNS 1343 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 1344 NestedNameSpecifier *NNSPrefix = NNS->getPrefix(); 1345 switch (NNS->getKind()) { 1346 case NestedNameSpecifier::Identifier: 1347 ClsType = Context.getDependentNameType(ETK_None, NNSPrefix, 1348 NNS->getAsIdentifier()); 1349 break; 1350 1351 case NestedNameSpecifier::Namespace: 1352 case NestedNameSpecifier::Global: 1353 llvm_unreachable("Nested-name-specifier must name a type"); 1354 break; 1355 1356 case NestedNameSpecifier::TypeSpec: 1357 case NestedNameSpecifier::TypeSpecWithTemplate: 1358 ClsType = QualType(NNS->getAsType(), 0); 1359 // Note: if NNS is dependent, then its prefix (if any) is already 1360 // included in ClsType; this does not hold if the NNS is 1361 // nondependent: in this case (if there is indeed a prefix) 1362 // ClsType needs to be wrapped into an elaborated type. 1363 if (NNSPrefix && !NNS->isDependent()) 1364 ClsType = Context.getElaboratedType(ETK_None, NNSPrefix, ClsType); 1365 break; 1366 } 1367 } else { 1368 Diag(DeclType.Mem.Scope().getBeginLoc(), 1369 diag::err_illegal_decl_mempointer_in_nonclass) 1370 << (D.getIdentifier() ? D.getIdentifier()->getName() : "type name") 1371 << DeclType.Mem.Scope().getRange(); 1372 D.setInvalidType(true); 1373 } 1374 1375 if (!ClsType.isNull()) 1376 T = BuildMemberPointerType(T, ClsType, DeclType.Loc, D.getIdentifier()); 1377 if (T.isNull()) { 1378 T = Context.IntTy; 1379 D.setInvalidType(true); 1380 } else if (DeclType.Mem.TypeQuals) { 1381 T = BuildQualifiedType(T, DeclType.Loc, DeclType.Mem.TypeQuals); 1382 } 1383 break; 1384 } 1385 1386 if (T.isNull()) { 1387 D.setInvalidType(true); 1388 T = Context.IntTy; 1389 } 1390 1391 DiagnoseDelayedFnAttrs(*this, FnAttrsFromPreviousChunk); 1392 1393 // See if there are any attributes on this declarator chunk. 1394 if (const AttributeList *AL = DeclType.getAttrs()) 1395 ProcessTypeAttributeList(*this, T, false, AL, FnAttrsFromPreviousChunk); 1396 } 1397 1398 if (getLangOptions().CPlusPlus && T->isFunctionType()) { 1399 const FunctionProtoType *FnTy = T->getAs<FunctionProtoType>(); 1400 assert(FnTy && "Why oh why is there not a FunctionProtoType here?"); 1401 1402 // C++ 8.3.5p4: A cv-qualifier-seq shall only be part of the function type 1403 // for a nonstatic member function, the function type to which a pointer 1404 // to member refers, or the top-level function type of a function typedef 1405 // declaration. 1406 bool FreeFunction = (D.getContext() != Declarator::MemberContext && 1407 (!D.getCXXScopeSpec().isSet() || 1408 !computeDeclContext(D.getCXXScopeSpec(), /*FIXME:*/true)->isRecord())); 1409 if (FnTy->getTypeQuals() != 0 && 1410 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 1411 (FreeFunction || 1412 D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_static)) { 1413 if (D.isFunctionDeclarator()) 1414 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_function_type); 1415 else 1416 Diag(D.getIdentifierLoc(), 1417 diag::err_invalid_qualified_typedef_function_type_use) 1418 << FreeFunction; 1419 1420 // Strip the cv-quals from the type. 1421 T = Context.getFunctionType(FnTy->getResultType(), FnTy->arg_type_begin(), 1422 FnTy->getNumArgs(), FnTy->isVariadic(), 0, 1423 false, false, 0, 0, FunctionType::ExtInfo()); 1424 } 1425 } 1426 1427 // If there's a constexpr specifier, treat it as a top-level const. 1428 if (D.getDeclSpec().isConstexprSpecified()) { 1429 T.addConst(); 1430 } 1431 1432 // Process any function attributes we might have delayed from the 1433 // declaration-specifiers. 1434 ProcessDelayedFnAttrs(*this, T, FnAttrsFromDeclSpec); 1435 1436 // If there were any type attributes applied to the decl itself, not 1437 // the type, apply them to the result type. But don't do this for 1438 // block-literal expressions, which are parsed wierdly. 1439 if (D.getContext() != Declarator::BlockLiteralContext) 1440 if (const AttributeList *Attrs = D.getAttributes()) 1441 ProcessTypeAttributeList(*this, T, false, Attrs, 1442 FnAttrsFromPreviousChunk); 1443 1444 DiagnoseDelayedFnAttrs(*this, FnAttrsFromPreviousChunk); 1445 1446 if (T.isNull()) 1447 return Context.getNullTypeSourceInfo(); 1448 else if (D.isInvalidType()) 1449 return Context.getTrivialTypeSourceInfo(T); 1450 return GetTypeSourceInfoForDeclarator(D, T, ReturnTypeInfo); 1451} 1452 1453namespace { 1454 class TypeSpecLocFiller : public TypeLocVisitor<TypeSpecLocFiller> { 1455 const DeclSpec &DS; 1456 1457 public: 1458 TypeSpecLocFiller(const DeclSpec &DS) : DS(DS) {} 1459 1460 void VisitQualifiedTypeLoc(QualifiedTypeLoc TL) { 1461 Visit(TL.getUnqualifiedLoc()); 1462 } 1463 void VisitTypedefTypeLoc(TypedefTypeLoc TL) { 1464 TL.setNameLoc(DS.getTypeSpecTypeLoc()); 1465 } 1466 void VisitObjCInterfaceTypeLoc(ObjCInterfaceTypeLoc TL) { 1467 TL.setNameLoc(DS.getTypeSpecTypeLoc()); 1468 } 1469 void VisitObjCObjectTypeLoc(ObjCObjectTypeLoc TL) { 1470 // Handle the base type, which might not have been written explicitly. 1471 if (DS.getTypeSpecType() == DeclSpec::TST_unspecified) { 1472 TL.setHasBaseTypeAsWritten(false); 1473 TL.getBaseLoc().initialize(SourceLocation()); 1474 } else { 1475 TL.setHasBaseTypeAsWritten(true); 1476 Visit(TL.getBaseLoc()); 1477 } 1478 1479 // Protocol qualifiers. 1480 if (DS.getProtocolQualifiers()) { 1481 assert(TL.getNumProtocols() > 0); 1482 assert(TL.getNumProtocols() == DS.getNumProtocolQualifiers()); 1483 TL.setLAngleLoc(DS.getProtocolLAngleLoc()); 1484 TL.setRAngleLoc(DS.getSourceRange().getEnd()); 1485 for (unsigned i = 0, e = DS.getNumProtocolQualifiers(); i != e; ++i) 1486 TL.setProtocolLoc(i, DS.getProtocolLocs()[i]); 1487 } else { 1488 assert(TL.getNumProtocols() == 0); 1489 TL.setLAngleLoc(SourceLocation()); 1490 TL.setRAngleLoc(SourceLocation()); 1491 } 1492 } 1493 void VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL) { 1494 TL.setStarLoc(SourceLocation()); 1495 Visit(TL.getPointeeLoc()); 1496 } 1497 void VisitTemplateSpecializationTypeLoc(TemplateSpecializationTypeLoc TL) { 1498 TypeSourceInfo *TInfo = 0; 1499 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 1500 1501 // If we got no declarator info from previous Sema routines, 1502 // just fill with the typespec loc. 1503 if (!TInfo) { 1504 TL.initialize(DS.getTypeSpecTypeLoc()); 1505 return; 1506 } 1507 1508 TypeLoc OldTL = TInfo->getTypeLoc(); 1509 if (TInfo->getType()->getAs<ElaboratedType>()) { 1510 ElaboratedTypeLoc ElabTL = cast<ElaboratedTypeLoc>(OldTL); 1511 TemplateSpecializationTypeLoc NamedTL = 1512 cast<TemplateSpecializationTypeLoc>(ElabTL.getNamedTypeLoc()); 1513 TL.copy(NamedTL); 1514 } 1515 else 1516 TL.copy(cast<TemplateSpecializationTypeLoc>(OldTL)); 1517 } 1518 void VisitTypeOfExprTypeLoc(TypeOfExprTypeLoc TL) { 1519 assert(DS.getTypeSpecType() == DeclSpec::TST_typeofExpr); 1520 TL.setTypeofLoc(DS.getTypeSpecTypeLoc()); 1521 TL.setParensRange(DS.getTypeofParensRange()); 1522 } 1523 void VisitTypeOfTypeLoc(TypeOfTypeLoc TL) { 1524 assert(DS.getTypeSpecType() == DeclSpec::TST_typeofType); 1525 TL.setTypeofLoc(DS.getTypeSpecTypeLoc()); 1526 TL.setParensRange(DS.getTypeofParensRange()); 1527 assert(DS.getRepAsType()); 1528 TypeSourceInfo *TInfo = 0; 1529 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 1530 TL.setUnderlyingTInfo(TInfo); 1531 } 1532 void VisitBuiltinTypeLoc(BuiltinTypeLoc TL) { 1533 // By default, use the source location of the type specifier. 1534 TL.setBuiltinLoc(DS.getTypeSpecTypeLoc()); 1535 if (TL.needsExtraLocalData()) { 1536 // Set info for the written builtin specifiers. 1537 TL.getWrittenBuiltinSpecs() = DS.getWrittenBuiltinSpecs(); 1538 // Try to have a meaningful source location. 1539 if (TL.getWrittenSignSpec() != TSS_unspecified) 1540 // Sign spec loc overrides the others (e.g., 'unsigned long'). 1541 TL.setBuiltinLoc(DS.getTypeSpecSignLoc()); 1542 else if (TL.getWrittenWidthSpec() != TSW_unspecified) 1543 // Width spec loc overrides type spec loc (e.g., 'short int'). 1544 TL.setBuiltinLoc(DS.getTypeSpecWidthLoc()); 1545 } 1546 } 1547 void VisitElaboratedTypeLoc(ElaboratedTypeLoc TL) { 1548 ElaboratedTypeKeyword Keyword 1549 = TypeWithKeyword::getKeywordForTypeSpec(DS.getTypeSpecType()); 1550 if (Keyword == ETK_Typename) { 1551 TypeSourceInfo *TInfo = 0; 1552 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 1553 if (TInfo) { 1554 TL.copy(cast<ElaboratedTypeLoc>(TInfo->getTypeLoc())); 1555 return; 1556 } 1557 } 1558 TL.setKeywordLoc(Keyword != ETK_None 1559 ? DS.getTypeSpecTypeLoc() 1560 : SourceLocation()); 1561 const CXXScopeSpec& SS = DS.getTypeSpecScope(); 1562 TL.setQualifierRange(SS.isEmpty() ? SourceRange(): SS.getRange()); 1563 Visit(TL.getNextTypeLoc().getUnqualifiedLoc()); 1564 } 1565 void VisitDependentNameTypeLoc(DependentNameTypeLoc TL) { 1566 ElaboratedTypeKeyword Keyword 1567 = TypeWithKeyword::getKeywordForTypeSpec(DS.getTypeSpecType()); 1568 if (Keyword == ETK_Typename) { 1569 TypeSourceInfo *TInfo = 0; 1570 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 1571 if (TInfo) { 1572 TL.copy(cast<DependentNameTypeLoc>(TInfo->getTypeLoc())); 1573 return; 1574 } 1575 } 1576 TL.setKeywordLoc(Keyword != ETK_None 1577 ? DS.getTypeSpecTypeLoc() 1578 : SourceLocation()); 1579 const CXXScopeSpec& SS = DS.getTypeSpecScope(); 1580 TL.setQualifierRange(SS.isEmpty() ? SourceRange() : SS.getRange()); 1581 // FIXME: load appropriate source location. 1582 TL.setNameLoc(DS.getTypeSpecTypeLoc()); 1583 } 1584 void VisitDependentTemplateSpecializationTypeLoc( 1585 DependentTemplateSpecializationTypeLoc TL) { 1586 ElaboratedTypeKeyword Keyword 1587 = TypeWithKeyword::getKeywordForTypeSpec(DS.getTypeSpecType()); 1588 if (Keyword == ETK_Typename) { 1589 TypeSourceInfo *TInfo = 0; 1590 Sema::GetTypeFromParser(DS.getRepAsType(), &TInfo); 1591 if (TInfo) { 1592 TL.copy(cast<DependentTemplateSpecializationTypeLoc>( 1593 TInfo->getTypeLoc())); 1594 return; 1595 } 1596 } 1597 TL.initializeLocal(SourceLocation()); 1598 TL.setKeywordLoc(Keyword != ETK_None 1599 ? DS.getTypeSpecTypeLoc() 1600 : SourceLocation()); 1601 const CXXScopeSpec& SS = DS.getTypeSpecScope(); 1602 TL.setQualifierRange(SS.isEmpty() ? SourceRange() : SS.getRange()); 1603 // FIXME: load appropriate source location. 1604 TL.setNameLoc(DS.getTypeSpecTypeLoc()); 1605 } 1606 1607 void VisitTypeLoc(TypeLoc TL) { 1608 // FIXME: add other typespec types and change this to an assert. 1609 TL.initialize(DS.getTypeSpecTypeLoc()); 1610 } 1611 }; 1612 1613 class DeclaratorLocFiller : public TypeLocVisitor<DeclaratorLocFiller> { 1614 const DeclaratorChunk &Chunk; 1615 1616 public: 1617 DeclaratorLocFiller(const DeclaratorChunk &Chunk) : Chunk(Chunk) {} 1618 1619 void VisitQualifiedTypeLoc(QualifiedTypeLoc TL) { 1620 llvm_unreachable("qualified type locs not expected here!"); 1621 } 1622 1623 void VisitBlockPointerTypeLoc(BlockPointerTypeLoc TL) { 1624 assert(Chunk.Kind == DeclaratorChunk::BlockPointer); 1625 TL.setCaretLoc(Chunk.Loc); 1626 } 1627 void VisitPointerTypeLoc(PointerTypeLoc TL) { 1628 assert(Chunk.Kind == DeclaratorChunk::Pointer); 1629 TL.setStarLoc(Chunk.Loc); 1630 } 1631 void VisitObjCObjectPointerTypeLoc(ObjCObjectPointerTypeLoc TL) { 1632 assert(Chunk.Kind == DeclaratorChunk::Pointer); 1633 TL.setStarLoc(Chunk.Loc); 1634 } 1635 void VisitMemberPointerTypeLoc(MemberPointerTypeLoc TL) { 1636 assert(Chunk.Kind == DeclaratorChunk::MemberPointer); 1637 TL.setStarLoc(Chunk.Loc); 1638 // FIXME: nested name specifier 1639 } 1640 void VisitLValueReferenceTypeLoc(LValueReferenceTypeLoc TL) { 1641 assert(Chunk.Kind == DeclaratorChunk::Reference); 1642 // 'Amp' is misleading: this might have been originally 1643 /// spelled with AmpAmp. 1644 TL.setAmpLoc(Chunk.Loc); 1645 } 1646 void VisitRValueReferenceTypeLoc(RValueReferenceTypeLoc TL) { 1647 assert(Chunk.Kind == DeclaratorChunk::Reference); 1648 assert(!Chunk.Ref.LValueRef); 1649 TL.setAmpAmpLoc(Chunk.Loc); 1650 } 1651 void VisitArrayTypeLoc(ArrayTypeLoc TL) { 1652 assert(Chunk.Kind == DeclaratorChunk::Array); 1653 TL.setLBracketLoc(Chunk.Loc); 1654 TL.setRBracketLoc(Chunk.EndLoc); 1655 TL.setSizeExpr(static_cast<Expr*>(Chunk.Arr.NumElts)); 1656 } 1657 void VisitFunctionTypeLoc(FunctionTypeLoc TL) { 1658 assert(Chunk.Kind == DeclaratorChunk::Function); 1659 TL.setLParenLoc(Chunk.Loc); 1660 TL.setRParenLoc(Chunk.EndLoc); 1661 TL.setTrailingReturn(!!Chunk.Fun.TrailingReturnType); 1662 1663 const DeclaratorChunk::FunctionTypeInfo &FTI = Chunk.Fun; 1664 for (unsigned i = 0, e = TL.getNumArgs(), tpi = 0; i != e; ++i) { 1665 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 1666 TL.setArg(tpi++, Param); 1667 } 1668 // FIXME: exception specs 1669 } 1670 1671 void VisitTypeLoc(TypeLoc TL) { 1672 llvm_unreachable("unsupported TypeLoc kind in declarator!"); 1673 } 1674 }; 1675} 1676 1677/// \brief Create and instantiate a TypeSourceInfo with type source information. 1678/// 1679/// \param T QualType referring to the type as written in source code. 1680/// 1681/// \param ReturnTypeInfo For declarators whose return type does not show 1682/// up in the normal place in the declaration specifiers (such as a C++ 1683/// conversion function), this pointer will refer to a type source information 1684/// for that return type. 1685TypeSourceInfo * 1686Sema::GetTypeSourceInfoForDeclarator(Declarator &D, QualType T, 1687 TypeSourceInfo *ReturnTypeInfo) { 1688 TypeSourceInfo *TInfo = Context.CreateTypeSourceInfo(T); 1689 UnqualTypeLoc CurrTL = TInfo->getTypeLoc().getUnqualifiedLoc(); 1690 1691 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 1692 DeclaratorLocFiller(D.getTypeObject(i)).Visit(CurrTL); 1693 CurrTL = CurrTL.getNextTypeLoc().getUnqualifiedLoc(); 1694 } 1695 1696 // If we have different source information for the return type, use 1697 // that. This really only applies to C++ conversion functions. 1698 if (ReturnTypeInfo) { 1699 TypeLoc TL = ReturnTypeInfo->getTypeLoc(); 1700 assert(TL.getFullDataSize() == CurrTL.getFullDataSize()); 1701 memcpy(CurrTL.getOpaqueData(), TL.getOpaqueData(), TL.getFullDataSize()); 1702 } else { 1703 TypeSpecLocFiller(D.getDeclSpec()).Visit(CurrTL); 1704 } 1705 1706 return TInfo; 1707} 1708 1709/// \brief Create a LocInfoType to hold the given QualType and TypeSourceInfo. 1710ParsedType Sema::CreateParsedType(QualType T, TypeSourceInfo *TInfo) { 1711 // FIXME: LocInfoTypes are "transient", only needed for passing to/from Parser 1712 // and Sema during declaration parsing. Try deallocating/caching them when 1713 // it's appropriate, instead of allocating them and keeping them around. 1714 LocInfoType *LocT = (LocInfoType*)BumpAlloc.Allocate(sizeof(LocInfoType), 8); 1715 new (LocT) LocInfoType(T, TInfo); 1716 assert(LocT->getTypeClass() != T->getTypeClass() && 1717 "LocInfoType's TypeClass conflicts with an existing Type class"); 1718 return ParsedType::make(QualType(LocT, 0)); 1719} 1720 1721void LocInfoType::getAsStringInternal(std::string &Str, 1722 const PrintingPolicy &Policy) const { 1723 assert(false && "LocInfoType leaked into the type system; an opaque TypeTy*" 1724 " was used directly instead of getting the QualType through" 1725 " GetTypeFromParser"); 1726} 1727 1728TypeResult Sema::ActOnTypeName(Scope *S, Declarator &D) { 1729 // C99 6.7.6: Type names have no identifier. This is already validated by 1730 // the parser. 1731 assert(D.getIdentifier() == 0 && "Type name should have no identifier!"); 1732 1733 TagDecl *OwnedTag = 0; 1734 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S, &OwnedTag); 1735 QualType T = TInfo->getType(); 1736 if (D.isInvalidType()) 1737 return true; 1738 1739 if (getLangOptions().CPlusPlus) { 1740 // Check that there are no default arguments (C++ only). 1741 CheckExtraCXXDefaultArguments(D); 1742 1743 // C++0x [dcl.type]p3: 1744 // A type-specifier-seq shall not define a class or enumeration 1745 // unless it appears in the type-id of an alias-declaration 1746 // (7.1.3). 1747 if (OwnedTag && OwnedTag->isDefinition()) 1748 Diag(OwnedTag->getLocation(), diag::err_type_defined_in_type_specifier) 1749 << Context.getTypeDeclType(OwnedTag); 1750 } 1751 1752 return CreateParsedType(T, TInfo); 1753} 1754 1755 1756 1757//===----------------------------------------------------------------------===// 1758// Type Attribute Processing 1759//===----------------------------------------------------------------------===// 1760 1761/// HandleAddressSpaceTypeAttribute - Process an address_space attribute on the 1762/// specified type. The attribute contains 1 argument, the id of the address 1763/// space for the type. 1764static void HandleAddressSpaceTypeAttribute(QualType &Type, 1765 const AttributeList &Attr, Sema &S){ 1766 1767 // If this type is already address space qualified, reject it. 1768 // Clause 6.7.3 - Type qualifiers: "No type shall be qualified by qualifiers 1769 // for two or more different address spaces." 1770 if (Type.getAddressSpace()) { 1771 S.Diag(Attr.getLoc(), diag::err_attribute_address_multiple_qualifiers); 1772 Attr.setInvalid(); 1773 return; 1774 } 1775 1776 // Check the attribute arguments. 1777 if (Attr.getNumArgs() != 1) { 1778 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 1779 Attr.setInvalid(); 1780 return; 1781 } 1782 Expr *ASArgExpr = static_cast<Expr *>(Attr.getArg(0)); 1783 llvm::APSInt addrSpace(32); 1784 if (ASArgExpr->isTypeDependent() || ASArgExpr->isValueDependent() || 1785 !ASArgExpr->isIntegerConstantExpr(addrSpace, S.Context)) { 1786 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_not_int) 1787 << ASArgExpr->getSourceRange(); 1788 Attr.setInvalid(); 1789 return; 1790 } 1791 1792 // Bounds checking. 1793 if (addrSpace.isSigned()) { 1794 if (addrSpace.isNegative()) { 1795 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_negative) 1796 << ASArgExpr->getSourceRange(); 1797 Attr.setInvalid(); 1798 return; 1799 } 1800 addrSpace.setIsSigned(false); 1801 } 1802 llvm::APSInt max(addrSpace.getBitWidth()); 1803 max = Qualifiers::MaxAddressSpace; 1804 if (addrSpace > max) { 1805 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_too_high) 1806 << Qualifiers::MaxAddressSpace << ASArgExpr->getSourceRange(); 1807 Attr.setInvalid(); 1808 return; 1809 } 1810 1811 unsigned ASIdx = static_cast<unsigned>(addrSpace.getZExtValue()); 1812 Type = S.Context.getAddrSpaceQualType(Type, ASIdx); 1813} 1814 1815/// HandleObjCGCTypeAttribute - Process an objc's gc attribute on the 1816/// specified type. The attribute contains 1 argument, weak or strong. 1817static void HandleObjCGCTypeAttribute(QualType &Type, 1818 const AttributeList &Attr, Sema &S) { 1819 if (Type.getObjCGCAttr() != Qualifiers::GCNone) { 1820 S.Diag(Attr.getLoc(), diag::err_attribute_multiple_objc_gc); 1821 Attr.setInvalid(); 1822 return; 1823 } 1824 1825 // Check the attribute arguments. 1826 if (!Attr.getParameterName()) { 1827 S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_string) 1828 << "objc_gc" << 1; 1829 Attr.setInvalid(); 1830 return; 1831 } 1832 Qualifiers::GC GCAttr; 1833 if (Attr.getNumArgs() != 0) { 1834 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 1835 Attr.setInvalid(); 1836 return; 1837 } 1838 if (Attr.getParameterName()->isStr("weak")) 1839 GCAttr = Qualifiers::Weak; 1840 else if (Attr.getParameterName()->isStr("strong")) 1841 GCAttr = Qualifiers::Strong; 1842 else { 1843 S.Diag(Attr.getLoc(), diag::warn_attribute_type_not_supported) 1844 << "objc_gc" << Attr.getParameterName(); 1845 Attr.setInvalid(); 1846 return; 1847 } 1848 1849 Type = S.Context.getObjCGCQualType(Type, GCAttr); 1850} 1851 1852/// Process an individual function attribute. Returns true if the 1853/// attribute does not make sense to apply to this type. 1854bool ProcessFnAttr(Sema &S, QualType &Type, const AttributeList &Attr) { 1855 if (Attr.getKind() == AttributeList::AT_noreturn) { 1856 // Complain immediately if the arg count is wrong. 1857 if (Attr.getNumArgs() != 0) { 1858 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0; 1859 Attr.setInvalid(); 1860 return false; 1861 } 1862 1863 // Delay if this is not a function or pointer to block. 1864 if (!Type->isFunctionPointerType() 1865 && !Type->isBlockPointerType() 1866 && !Type->isFunctionType() 1867 && !Type->isMemberFunctionPointerType()) 1868 return true; 1869 1870 // Otherwise we can process right away. 1871 Type = S.Context.getNoReturnType(Type); 1872 return false; 1873 } 1874 1875 if (Attr.getKind() == AttributeList::AT_regparm) { 1876 // The warning is emitted elsewhere 1877 if (Attr.getNumArgs() != 1) { 1878 return false; 1879 } 1880 1881 // Delay if this is not a function or pointer to block. 1882 if (!Type->isFunctionPointerType() 1883 && !Type->isBlockPointerType() 1884 && !Type->isFunctionType() 1885 && !Type->isMemberFunctionPointerType()) 1886 return true; 1887 1888 // Otherwise we can process right away. 1889 Expr *NumParamsExpr = static_cast<Expr *>(Attr.getArg(0)); 1890 llvm::APSInt NumParams(32); 1891 1892 // The warning is emitted elsewhere 1893 if (NumParamsExpr->isTypeDependent() || NumParamsExpr->isValueDependent() || 1894 !NumParamsExpr->isIntegerConstantExpr(NumParams, S.Context)) 1895 return false; 1896 1897 Type = S.Context.getRegParmType(Type, NumParams.getZExtValue()); 1898 return false; 1899 } 1900 1901 // Otherwise, a calling convention. 1902 if (Attr.getNumArgs() != 0) { 1903 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 0; 1904 Attr.setInvalid(); 1905 return false; 1906 } 1907 1908 QualType T = Type; 1909 if (const PointerType *PT = Type->getAs<PointerType>()) 1910 T = PT->getPointeeType(); 1911 else if (const BlockPointerType *BPT = Type->getAs<BlockPointerType>()) 1912 T = BPT->getPointeeType(); 1913 else if (const MemberPointerType *MPT = Type->getAs<MemberPointerType>()) 1914 T = MPT->getPointeeType(); 1915 else if (const ReferenceType *RT = Type->getAs<ReferenceType>()) 1916 T = RT->getPointeeType(); 1917 const FunctionType *Fn = T->getAs<FunctionType>(); 1918 1919 // Delay if the type didn't work out to a function. 1920 if (!Fn) return true; 1921 1922 // TODO: diagnose uses of these conventions on the wrong target. 1923 CallingConv CC; 1924 switch (Attr.getKind()) { 1925 case AttributeList::AT_cdecl: CC = CC_C; break; 1926 case AttributeList::AT_fastcall: CC = CC_X86FastCall; break; 1927 case AttributeList::AT_stdcall: CC = CC_X86StdCall; break; 1928 case AttributeList::AT_thiscall: CC = CC_X86ThisCall; break; 1929 case AttributeList::AT_pascal: CC = CC_X86Pascal; break; 1930 default: llvm_unreachable("unexpected attribute kind"); return false; 1931 } 1932 1933 CallingConv CCOld = Fn->getCallConv(); 1934 if (S.Context.getCanonicalCallConv(CC) == 1935 S.Context.getCanonicalCallConv(CCOld)) { 1936 Attr.setInvalid(); 1937 return false; 1938 } 1939 1940 if (CCOld != CC_Default) { 1941 // Should we diagnose reapplications of the same convention? 1942 S.Diag(Attr.getLoc(), diag::err_attributes_are_not_compatible) 1943 << FunctionType::getNameForCallConv(CC) 1944 << FunctionType::getNameForCallConv(CCOld); 1945 Attr.setInvalid(); 1946 return false; 1947 } 1948 1949 // Diagnose the use of X86 fastcall on varargs or unprototyped functions. 1950 if (CC == CC_X86FastCall) { 1951 if (isa<FunctionNoProtoType>(Fn)) { 1952 S.Diag(Attr.getLoc(), diag::err_cconv_knr) 1953 << FunctionType::getNameForCallConv(CC); 1954 Attr.setInvalid(); 1955 return false; 1956 } 1957 1958 const FunctionProtoType *FnP = cast<FunctionProtoType>(Fn); 1959 if (FnP->isVariadic()) { 1960 S.Diag(Attr.getLoc(), diag::err_cconv_varargs) 1961 << FunctionType::getNameForCallConv(CC); 1962 Attr.setInvalid(); 1963 return false; 1964 } 1965 } 1966 1967 Type = S.Context.getCallConvType(Type, CC); 1968 return false; 1969} 1970 1971/// HandleVectorSizeAttribute - this attribute is only applicable to integral 1972/// and float scalars, although arrays, pointers, and function return values are 1973/// allowed in conjunction with this construct. Aggregates with this attribute 1974/// are invalid, even if they are of the same size as a corresponding scalar. 1975/// The raw attribute should contain precisely 1 argument, the vector size for 1976/// the variable, measured in bytes. If curType and rawAttr are well formed, 1977/// this routine will return a new vector type. 1978static void HandleVectorSizeAttr(QualType& CurType, const AttributeList &Attr, 1979 Sema &S) { 1980 // Check the attribute arugments. 1981 if (Attr.getNumArgs() != 1) { 1982 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 1983 Attr.setInvalid(); 1984 return; 1985 } 1986 Expr *sizeExpr = static_cast<Expr *>(Attr.getArg(0)); 1987 llvm::APSInt vecSize(32); 1988 if (sizeExpr->isTypeDependent() || sizeExpr->isValueDependent() || 1989 !sizeExpr->isIntegerConstantExpr(vecSize, S.Context)) { 1990 S.Diag(Attr.getLoc(), diag::err_attribute_argument_not_int) 1991 << "vector_size" << sizeExpr->getSourceRange(); 1992 Attr.setInvalid(); 1993 return; 1994 } 1995 // the base type must be integer or float, and can't already be a vector. 1996 if (!CurType->isIntegerType() && !CurType->isRealFloatingType()) { 1997 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_vector_type) << CurType; 1998 Attr.setInvalid(); 1999 return; 2000 } 2001 unsigned typeSize = static_cast<unsigned>(S.Context.getTypeSize(CurType)); 2002 // vecSize is specified in bytes - convert to bits. 2003 unsigned vectorSize = static_cast<unsigned>(vecSize.getZExtValue() * 8); 2004 2005 // the vector size needs to be an integral multiple of the type size. 2006 if (vectorSize % typeSize) { 2007 S.Diag(Attr.getLoc(), diag::err_attribute_invalid_size) 2008 << sizeExpr->getSourceRange(); 2009 Attr.setInvalid(); 2010 return; 2011 } 2012 if (vectorSize == 0) { 2013 S.Diag(Attr.getLoc(), diag::err_attribute_zero_size) 2014 << sizeExpr->getSourceRange(); 2015 Attr.setInvalid(); 2016 return; 2017 } 2018 2019 // Success! Instantiate the vector type, the number of elements is > 0, and 2020 // not required to be a power of 2, unlike GCC. 2021 CurType = S.Context.getVectorType(CurType, vectorSize/typeSize, 2022 VectorType::NotAltiVec); 2023} 2024 2025void ProcessTypeAttributeList(Sema &S, QualType &Result, 2026 bool IsDeclSpec, const AttributeList *AL, 2027 DelayedAttributeSet &FnAttrs) { 2028 // Scan through and apply attributes to this type where it makes sense. Some 2029 // attributes (such as __address_space__, __vector_size__, etc) apply to the 2030 // type, but others can be present in the type specifiers even though they 2031 // apply to the decl. Here we apply type attributes and ignore the rest. 2032 for (; AL; AL = AL->getNext()) { 2033 // Skip attributes that were marked to be invalid. 2034 if (AL->isInvalid()) 2035 continue; 2036 2037 // If this is an attribute we can handle, do so now, 2038 // otherwise, add it to the FnAttrs list for rechaining. 2039 switch (AL->getKind()) { 2040 default: break; 2041 2042 case AttributeList::AT_address_space: 2043 HandleAddressSpaceTypeAttribute(Result, *AL, S); 2044 break; 2045 case AttributeList::AT_objc_gc: 2046 HandleObjCGCTypeAttribute(Result, *AL, S); 2047 break; 2048 case AttributeList::AT_vector_size: 2049 HandleVectorSizeAttr(Result, *AL, S); 2050 break; 2051 2052 case AttributeList::AT_noreturn: 2053 case AttributeList::AT_cdecl: 2054 case AttributeList::AT_fastcall: 2055 case AttributeList::AT_stdcall: 2056 case AttributeList::AT_thiscall: 2057 case AttributeList::AT_pascal: 2058 case AttributeList::AT_regparm: 2059 // Don't process these on the DeclSpec. 2060 if (IsDeclSpec || 2061 ProcessFnAttr(S, Result, *AL)) 2062 FnAttrs.push_back(DelayedAttribute(AL, Result)); 2063 break; 2064 } 2065 } 2066} 2067 2068/// @brief Ensure that the type T is a complete type. 2069/// 2070/// This routine checks whether the type @p T is complete in any 2071/// context where a complete type is required. If @p T is a complete 2072/// type, returns false. If @p T is a class template specialization, 2073/// this routine then attempts to perform class template 2074/// instantiation. If instantiation fails, or if @p T is incomplete 2075/// and cannot be completed, issues the diagnostic @p diag (giving it 2076/// the type @p T) and returns true. 2077/// 2078/// @param Loc The location in the source that the incomplete type 2079/// diagnostic should refer to. 2080/// 2081/// @param T The type that this routine is examining for completeness. 2082/// 2083/// @param PD The partial diagnostic that will be printed out if T is not a 2084/// complete type. 2085/// 2086/// @returns @c true if @p T is incomplete and a diagnostic was emitted, 2087/// @c false otherwise. 2088bool Sema::RequireCompleteType(SourceLocation Loc, QualType T, 2089 const PartialDiagnostic &PD, 2090 std::pair<SourceLocation, 2091 PartialDiagnostic> Note) { 2092 unsigned diag = PD.getDiagID(); 2093 2094 // FIXME: Add this assertion to make sure we always get instantiation points. 2095 // assert(!Loc.isInvalid() && "Invalid location in RequireCompleteType"); 2096 // FIXME: Add this assertion to help us flush out problems with 2097 // checking for dependent types and type-dependent expressions. 2098 // 2099 // assert(!T->isDependentType() && 2100 // "Can't ask whether a dependent type is complete"); 2101 2102 // If we have a complete type, we're done. 2103 if (!T->isIncompleteType()) 2104 return false; 2105 2106 // If we have a class template specialization or a class member of a 2107 // class template specialization, or an array with known size of such, 2108 // try to instantiate it. 2109 QualType MaybeTemplate = T; 2110 if (const ConstantArrayType *Array = Context.getAsConstantArrayType(T)) 2111 MaybeTemplate = Array->getElementType(); 2112 if (const RecordType *Record = MaybeTemplate->getAs<RecordType>()) { 2113 if (ClassTemplateSpecializationDecl *ClassTemplateSpec 2114 = dyn_cast<ClassTemplateSpecializationDecl>(Record->getDecl())) { 2115 if (ClassTemplateSpec->getSpecializationKind() == TSK_Undeclared) 2116 return InstantiateClassTemplateSpecialization(Loc, ClassTemplateSpec, 2117 TSK_ImplicitInstantiation, 2118 /*Complain=*/diag != 0); 2119 } else if (CXXRecordDecl *Rec 2120 = dyn_cast<CXXRecordDecl>(Record->getDecl())) { 2121 if (CXXRecordDecl *Pattern = Rec->getInstantiatedFromMemberClass()) { 2122 MemberSpecializationInfo *MSInfo = Rec->getMemberSpecializationInfo(); 2123 assert(MSInfo && "Missing member specialization information?"); 2124 // This record was instantiated from a class within a template. 2125 if (MSInfo->getTemplateSpecializationKind() 2126 != TSK_ExplicitSpecialization) 2127 return InstantiateClass(Loc, Rec, Pattern, 2128 getTemplateInstantiationArgs(Rec), 2129 TSK_ImplicitInstantiation, 2130 /*Complain=*/diag != 0); 2131 } 2132 } 2133 } 2134 2135 if (diag == 0) 2136 return true; 2137 2138 const TagType *Tag = 0; 2139 if (const RecordType *Record = T->getAs<RecordType>()) 2140 Tag = Record; 2141 else if (const EnumType *Enum = T->getAs<EnumType>()) 2142 Tag = Enum; 2143 2144 // Avoid diagnosing invalid decls as incomplete. 2145 if (Tag && Tag->getDecl()->isInvalidDecl()) 2146 return true; 2147 2148 // We have an incomplete type. Produce a diagnostic. 2149 Diag(Loc, PD) << T; 2150 2151 // If we have a note, produce it. 2152 if (!Note.first.isInvalid()) 2153 Diag(Note.first, Note.second); 2154 2155 // If the type was a forward declaration of a class/struct/union 2156 // type, produce a note. 2157 if (Tag && !Tag->getDecl()->isInvalidDecl()) 2158 Diag(Tag->getDecl()->getLocation(), 2159 Tag->isBeingDefined() ? diag::note_type_being_defined 2160 : diag::note_forward_declaration) 2161 << QualType(Tag, 0); 2162 2163 return true; 2164} 2165 2166bool Sema::RequireCompleteType(SourceLocation Loc, QualType T, 2167 const PartialDiagnostic &PD) { 2168 return RequireCompleteType(Loc, T, PD, 2169 std::make_pair(SourceLocation(), PDiag(0))); 2170} 2171 2172bool Sema::RequireCompleteType(SourceLocation Loc, QualType T, 2173 unsigned DiagID) { 2174 return RequireCompleteType(Loc, T, PDiag(DiagID), 2175 std::make_pair(SourceLocation(), PDiag(0))); 2176} 2177 2178/// \brief Retrieve a version of the type 'T' that is elaborated by Keyword 2179/// and qualified by the nested-name-specifier contained in SS. 2180QualType Sema::getElaboratedType(ElaboratedTypeKeyword Keyword, 2181 const CXXScopeSpec &SS, QualType T) { 2182 if (T.isNull()) 2183 return T; 2184 NestedNameSpecifier *NNS; 2185 if (SS.isValid()) 2186 NNS = static_cast<NestedNameSpecifier *>(SS.getScopeRep()); 2187 else { 2188 if (Keyword == ETK_None) 2189 return T; 2190 NNS = 0; 2191 } 2192 return Context.getElaboratedType(Keyword, NNS, T); 2193} 2194 2195QualType Sema::BuildTypeofExprType(Expr *E) { 2196 if (E->getType() == Context.OverloadTy) { 2197 // C++ [temp.arg.explicit]p3 allows us to resolve a template-id to a 2198 // function template specialization wherever deduction cannot occur. 2199 if (FunctionDecl *Specialization 2200 = ResolveSingleFunctionTemplateSpecialization(E)) { 2201 // The access doesn't really matter in this case. 2202 DeclAccessPair Found = DeclAccessPair::make(Specialization, 2203 Specialization->getAccess()); 2204 E = FixOverloadedFunctionReference(E, Found, Specialization); 2205 if (!E) 2206 return QualType(); 2207 } else { 2208 Diag(E->getLocStart(), 2209 diag::err_cannot_determine_declared_type_of_overloaded_function) 2210 << false << E->getSourceRange(); 2211 return QualType(); 2212 } 2213 } 2214 if (!E->isTypeDependent()) { 2215 QualType T = E->getType(); 2216 // FIXME. Issue warning for types built from deprecated types as well. 2217 if (const TagType *TT = T->getAs<TagType>()) 2218 DiagnoseUseOfDecl(TT->getDecl(), E->getExprLoc()); 2219 } 2220 return Context.getTypeOfExprType(E); 2221} 2222 2223QualType Sema::BuildDecltypeType(Expr *E) { 2224 if (E->getType() == Context.OverloadTy) { 2225 // C++ [temp.arg.explicit]p3 allows us to resolve a template-id to a 2226 // function template specialization wherever deduction cannot occur. 2227 if (FunctionDecl *Specialization 2228 = ResolveSingleFunctionTemplateSpecialization(E)) { 2229 // The access doesn't really matter in this case. 2230 DeclAccessPair Found = DeclAccessPair::make(Specialization, 2231 Specialization->getAccess()); 2232 E = FixOverloadedFunctionReference(E, Found, Specialization); 2233 if (!E) 2234 return QualType(); 2235 } else { 2236 Diag(E->getLocStart(), 2237 diag::err_cannot_determine_declared_type_of_overloaded_function) 2238 << true << E->getSourceRange(); 2239 return QualType(); 2240 } 2241 } 2242 2243 return Context.getDecltypeType(E); 2244} 2245