SemaType.cpp revision e91593ef084479340582b2ba177b44be50a717b7
1//===--- SemaType.cpp - Semantic Analysis for Types -----------------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements type-related semantic analysis. 11// 12//===----------------------------------------------------------------------===// 13 14#include "Sema.h" 15#include "clang/AST/ASTContext.h" 16#include "clang/AST/Decl.h" 17#include "clang/AST/DeclObjC.h" 18#include "clang/AST/Expr.h" 19#include "clang/Basic/Diagnostic.h" 20#include "clang/Basic/LangOptions.h" 21#include "clang/Parse/DeclSpec.h" 22using namespace clang; 23 24/// ConvertDeclSpecToType - Convert the specified declspec to the appropriate 25/// type object. This returns null on error. 26QualType Sema::ConvertDeclSpecToType(const DeclSpec &DS) { 27 // FIXME: Should move the logic from DeclSpec::Finish to here for validity 28 // checking. 29 QualType Result; 30 31 switch (DS.getTypeSpecType()) { 32 default: assert(0 && "Unknown TypeSpecType!"); 33 case DeclSpec::TST_void: 34 Result = Context.VoidTy; 35 break; 36 case DeclSpec::TST_char: 37 if (DS.getTypeSpecSign() == DeclSpec::TSS_unspecified) 38 Result = Context.CharTy; 39 else if (DS.getTypeSpecSign() == DeclSpec::TSS_signed) 40 Result = Context.SignedCharTy; 41 else { 42 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unsigned && 43 "Unknown TSS value"); 44 Result = Context.UnsignedCharTy; 45 } 46 break; 47 case DeclSpec::TST_wchar: 48 if (DS.getTypeSpecSign() == DeclSpec::TSS_unspecified) 49 Result = Context.WCharTy; 50 else if (DS.getTypeSpecSign() == DeclSpec::TSS_signed) { 51 Diag(DS.getTypeSpecSignLoc(), diag::ext_invalid_sign_spec, 52 DS.getSpecifierName(DS.getTypeSpecType())); 53 Result = Context.getSignedWCharType(); 54 } else { 55 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unsigned && 56 "Unknown TSS value"); 57 Diag(DS.getTypeSpecSignLoc(), diag::ext_invalid_sign_spec, 58 DS.getSpecifierName(DS.getTypeSpecType())); 59 Result = Context.getUnsignedWCharType(); 60 } 61 break; 62 case DeclSpec::TST_unspecified: 63 // "<proto1,proto2>" is an objc qualified ID with a missing id. 64 if (DeclSpec::ProtocolQualifierListTy PQ = DS.getProtocolQualifiers()) { 65 Result = Context.getObjCQualifiedIdType((ObjCProtocolDecl**)PQ, 66 DS.getNumProtocolQualifiers()); 67 break; 68 } 69 70 // Unspecified typespec defaults to int in C90. However, the C90 grammar 71 // [C90 6.5] only allows a decl-spec if there was *some* type-specifier, 72 // type-qualifier, or storage-class-specifier. If not, emit an extwarn. 73 // Note that the one exception to this is function definitions, which are 74 // allowed to be completely missing a declspec. This is handled in the 75 // parser already though by it pretending to have seen an 'int' in this 76 // case. 77 if (getLangOptions().ImplicitInt) { 78 if ((DS.getParsedSpecifiers() & (DeclSpec::PQ_StorageClassSpecifier | 79 DeclSpec::PQ_TypeSpecifier | 80 DeclSpec::PQ_TypeQualifier)) == 0) 81 Diag(DS.getSourceRange().getBegin(), diag::ext_missing_declspec); 82 } else { 83 // C99 and C++ require a type specifier. For example, C99 6.7.2p2 says: 84 // "At least one type specifier shall be given in the declaration 85 // specifiers in each declaration, and in the specifier-qualifier list in 86 // each struct declaration and type name." 87 if (!DS.hasTypeSpecifier()) 88 Diag(DS.getSourceRange().getBegin(), diag::ext_missing_type_specifier); 89 } 90 91 // FALL THROUGH. 92 case DeclSpec::TST_int: { 93 if (DS.getTypeSpecSign() != DeclSpec::TSS_unsigned) { 94 switch (DS.getTypeSpecWidth()) { 95 case DeclSpec::TSW_unspecified: Result = Context.IntTy; break; 96 case DeclSpec::TSW_short: Result = Context.ShortTy; break; 97 case DeclSpec::TSW_long: Result = Context.LongTy; break; 98 case DeclSpec::TSW_longlong: Result = Context.LongLongTy; break; 99 } 100 } else { 101 switch (DS.getTypeSpecWidth()) { 102 case DeclSpec::TSW_unspecified: Result = Context.UnsignedIntTy; break; 103 case DeclSpec::TSW_short: Result = Context.UnsignedShortTy; break; 104 case DeclSpec::TSW_long: Result = Context.UnsignedLongTy; break; 105 case DeclSpec::TSW_longlong: Result =Context.UnsignedLongLongTy; break; 106 } 107 } 108 break; 109 } 110 case DeclSpec::TST_float: Result = Context.FloatTy; break; 111 case DeclSpec::TST_double: 112 if (DS.getTypeSpecWidth() == DeclSpec::TSW_long) 113 Result = Context.LongDoubleTy; 114 else 115 Result = Context.DoubleTy; 116 break; 117 case DeclSpec::TST_bool: Result = Context.BoolTy; break; // _Bool or bool 118 case DeclSpec::TST_decimal32: // _Decimal32 119 case DeclSpec::TST_decimal64: // _Decimal64 120 case DeclSpec::TST_decimal128: // _Decimal128 121 assert(0 && "FIXME: GNU decimal extensions not supported yet!"); 122 case DeclSpec::TST_class: 123 case DeclSpec::TST_enum: 124 case DeclSpec::TST_union: 125 case DeclSpec::TST_struct: { 126 Decl *D = static_cast<Decl *>(DS.getTypeRep()); 127 assert(D && "Didn't get a decl for a class/enum/union/struct?"); 128 assert(DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 && 129 DS.getTypeSpecSign() == 0 && 130 "Can't handle qualifiers on typedef names yet!"); 131 // TypeQuals handled by caller. 132 Result = Context.getTypeDeclType(cast<TypeDecl>(D)); 133 break; 134 } 135 case DeclSpec::TST_typedef: { 136 Decl *D = static_cast<Decl *>(DS.getTypeRep()); 137 assert(D && "Didn't get a decl for a typedef?"); 138 assert(DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 && 139 DS.getTypeSpecSign() == 0 && 140 "Can't handle qualifiers on typedef names yet!"); 141 DeclSpec::ProtocolQualifierListTy PQ = DS.getProtocolQualifiers(); 142 143 // FIXME: Adding a TST_objcInterface clause doesn't seem ideal, so 144 // we have this "hack" for now... 145 if (ObjCInterfaceDecl *ObjCIntDecl = dyn_cast<ObjCInterfaceDecl>(D)) { 146 if (PQ == 0) { 147 Result = Context.getObjCInterfaceType(ObjCIntDecl); 148 break; 149 } 150 151 Result = Context.getObjCQualifiedInterfaceType(ObjCIntDecl, 152 (ObjCProtocolDecl**)PQ, 153 DS.getNumProtocolQualifiers()); 154 break; 155 } else if (TypedefDecl *typeDecl = dyn_cast<TypedefDecl>(D)) { 156 if (Context.getObjCIdType() == Context.getTypedefType(typeDecl) && PQ) { 157 // id<protocol-list> 158 Result = Context.getObjCQualifiedIdType((ObjCProtocolDecl**)PQ, 159 DS.getNumProtocolQualifiers()); 160 break; 161 } 162 } 163 // TypeQuals handled by caller. 164 Result = Context.getTypeDeclType(dyn_cast<TypeDecl>(D)); 165 break; 166 } 167 case DeclSpec::TST_typeofType: 168 Result = QualType::getFromOpaquePtr(DS.getTypeRep()); 169 assert(!Result.isNull() && "Didn't get a type for typeof?"); 170 // TypeQuals handled by caller. 171 Result = Context.getTypeOfType(Result); 172 break; 173 case DeclSpec::TST_typeofExpr: { 174 Expr *E = static_cast<Expr *>(DS.getTypeRep()); 175 assert(E && "Didn't get an expression for typeof?"); 176 // TypeQuals handled by caller. 177 Result = Context.getTypeOfExpr(E); 178 break; 179 } 180 } 181 182 // Handle complex types. 183 if (DS.getTypeSpecComplex() == DeclSpec::TSC_complex) 184 Result = Context.getComplexType(Result); 185 186 assert(DS.getTypeSpecComplex() != DeclSpec::TSC_imaginary && 187 "FIXME: imaginary types not supported yet!"); 188 189 // See if there are any attributes on the declspec that apply to the type (as 190 // opposed to the decl). 191 if (const AttributeList *AL = DS.getAttributes()) 192 ProcessTypeAttributeList(Result, AL); 193 194 // Apply const/volatile/restrict qualifiers to T. 195 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 196 197 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 198 // or incomplete types shall not be restrict-qualified." C++ also allows 199 // restrict-qualified references. 200 if (TypeQuals & QualType::Restrict) { 201 if (const PointerLikeType *PT = Result->getAsPointerLikeType()) { 202 QualType EltTy = PT->getPointeeType(); 203 204 // If we have a pointer or reference, the pointee must have an object or 205 // incomplete type. 206 if (!EltTy->isIncompleteOrObjectType()) { 207 Diag(DS.getRestrictSpecLoc(), 208 diag::err_typecheck_invalid_restrict_invalid_pointee, 209 EltTy.getAsString(), DS.getSourceRange()); 210 TypeQuals &= ~QualType::Restrict; // Remove the restrict qualifier. 211 } 212 } else { 213 Diag(DS.getRestrictSpecLoc(), 214 diag::err_typecheck_invalid_restrict_not_pointer, 215 Result.getAsString(), DS.getSourceRange()); 216 TypeQuals &= ~QualType::Restrict; // Remove the restrict qualifier. 217 } 218 } 219 220 // Warn about CV qualifiers on functions: C99 6.7.3p8: "If the specification 221 // of a function type includes any type qualifiers, the behavior is 222 // undefined." 223 if (Result->isFunctionType() && TypeQuals) { 224 // Get some location to point at, either the C or V location. 225 SourceLocation Loc; 226 if (TypeQuals & QualType::Const) 227 Loc = DS.getConstSpecLoc(); 228 else { 229 assert((TypeQuals & QualType::Volatile) && 230 "Has CV quals but not C or V?"); 231 Loc = DS.getVolatileSpecLoc(); 232 } 233 Diag(Loc, diag::warn_typecheck_function_qualifiers, 234 Result.getAsString(), DS.getSourceRange()); 235 } 236 237 Result = Result.getQualifiedType(TypeQuals); 238 } 239 return Result; 240} 241 242/// GetTypeForDeclarator - Convert the type for the specified declarator to Type 243/// instances. 244QualType Sema::GetTypeForDeclarator(Declarator &D, Scope *S) { 245 // long long is a C99 feature. 246 if (!getLangOptions().C99 && !getLangOptions().CPlusPlus0x && 247 D.getDeclSpec().getTypeSpecWidth() == DeclSpec::TSW_longlong) 248 Diag(D.getDeclSpec().getTypeSpecWidthLoc(), diag::ext_longlong); 249 250 QualType T = ConvertDeclSpecToType(D.getDeclSpec()); 251 252 // Walk the DeclTypeInfo, building the recursive type as we go. DeclTypeInfos 253 // are ordered from the identifier out, which is opposite of what we want :). 254 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 255 DeclaratorChunk &DeclType = D.getTypeObject(e-i-1); 256 switch (DeclType.Kind) { 257 default: assert(0 && "Unknown decltype!"); 258 case DeclaratorChunk::Pointer: 259 if (T->isReferenceType()) { 260 // C++ 8.3.2p4: There shall be no ... pointers to references ... 261 Diag(DeclType.Loc, diag::err_illegal_decl_pointer_to_reference, 262 D.getIdentifier() ? D.getIdentifier()->getName() : "type name"); 263 D.setInvalidType(true); 264 T = Context.IntTy; 265 } 266 267 // Enforce C99 6.7.3p2: "Types other than pointer types derived from 268 // object or incomplete types shall not be restrict-qualified." 269 if ((DeclType.Ptr.TypeQuals & QualType::Restrict) && 270 !T->isIncompleteOrObjectType()) { 271 Diag(DeclType.Loc, 272 diag::err_typecheck_invalid_restrict_invalid_pointee, 273 T.getAsString()); 274 DeclType.Ptr.TypeQuals &= QualType::Restrict; 275 } 276 277 // Apply the pointer typequals to the pointer object. 278 T = Context.getPointerType(T).getQualifiedType(DeclType.Ptr.TypeQuals); 279 break; 280 case DeclaratorChunk::Reference: 281 if (const ReferenceType *RT = T->getAsReferenceType()) { 282 // C++ 8.3.2p4: There shall be no references to references. 283 Diag(DeclType.Loc, diag::err_illegal_decl_reference_to_reference, 284 D.getIdentifier() ? D.getIdentifier()->getName() : "type name"); 285 D.setInvalidType(true); 286 T = RT->getPointeeType(); 287 } 288 289 // Enforce C99 6.7.3p2: "Types other than pointer types derived from 290 // object or incomplete types shall not be restrict-qualified." 291 if (DeclType.Ref.HasRestrict && 292 !T->isIncompleteOrObjectType()) { 293 Diag(DeclType.Loc, 294 diag::err_typecheck_invalid_restrict_invalid_pointee, 295 T.getAsString()); 296 DeclType.Ref.HasRestrict = false; 297 } 298 299 T = Context.getReferenceType(T); 300 301 // Handle restrict on references. 302 if (DeclType.Ref.HasRestrict) 303 T.addRestrict(); 304 break; 305 case DeclaratorChunk::Array: { 306 DeclaratorChunk::ArrayTypeInfo &ATI = DeclType.Arr; 307 Expr *ArraySize = static_cast<Expr*>(ATI.NumElts); 308 ArrayType::ArraySizeModifier ASM; 309 if (ATI.isStar) 310 ASM = ArrayType::Star; 311 else if (ATI.hasStatic) 312 ASM = ArrayType::Static; 313 else 314 ASM = ArrayType::Normal; 315 316 // C99 6.7.5.2p1: If the element type is an incomplete or function type, 317 // reject it (e.g. void ary[7], struct foo ary[7], void ary[7]()) 318 if (T->isIncompleteType()) { 319 Diag(D.getIdentifierLoc(), diag::err_illegal_decl_array_incomplete_type, 320 T.getAsString()); 321 T = Context.IntTy; 322 D.setInvalidType(true); 323 } else if (T->isFunctionType()) { 324 Diag(D.getIdentifierLoc(), diag::err_illegal_decl_array_of_functions, 325 D.getIdentifier() ? D.getIdentifier()->getName() : "type name"); 326 T = Context.getPointerType(T); 327 D.setInvalidType(true); 328 } else if (const ReferenceType *RT = T->getAsReferenceType()) { 329 // C++ 8.3.2p4: There shall be no ... arrays of references ... 330 Diag(D.getIdentifierLoc(), diag::err_illegal_decl_array_of_references, 331 D.getIdentifier() ? D.getIdentifier()->getName() : "type name"); 332 T = RT->getPointeeType(); 333 D.setInvalidType(true); 334 } else if (const RecordType *EltTy = T->getAsRecordType()) { 335 // If the element type is a struct or union that contains a variadic 336 // array, reject it: C99 6.7.2.1p2. 337 if (EltTy->getDecl()->hasFlexibleArrayMember()) { 338 Diag(DeclType.Loc, diag::err_flexible_array_in_array, 339 T.getAsString()); 340 T = Context.IntTy; 341 D.setInvalidType(true); 342 } 343 } 344 // C99 6.7.5.2p1: The size expression shall have integer type. 345 if (ArraySize && !ArraySize->getType()->isIntegerType()) { 346 Diag(ArraySize->getLocStart(), diag::err_array_size_non_int, 347 ArraySize->getType().getAsString(), ArraySize->getSourceRange()); 348 D.setInvalidType(true); 349 delete ArraySize; 350 ATI.NumElts = ArraySize = 0; 351 } 352 llvm::APSInt ConstVal(32); 353 if (!ArraySize) { 354 T = Context.getIncompleteArrayType(T, ASM, ATI.TypeQuals); 355 } else if (!ArraySize->isIntegerConstantExpr(ConstVal, Context) || 356 !T->isConstantSizeType()) { 357 // Per C99, a variable array is an array with either a non-constant 358 // size or an element type that has a non-constant-size 359 T = Context.getVariableArrayType(T, ArraySize, ASM, ATI.TypeQuals); 360 } else { 361 // C99 6.7.5.2p1: If the expression is a constant expression, it shall 362 // have a value greater than zero. 363 if (ConstVal.isSigned()) { 364 if (ConstVal.isNegative()) { 365 Diag(ArraySize->getLocStart(), 366 diag::err_typecheck_negative_array_size, 367 ArraySize->getSourceRange()); 368 D.setInvalidType(true); 369 } else if (ConstVal == 0) { 370 // GCC accepts zero sized static arrays. 371 Diag(ArraySize->getLocStart(), diag::ext_typecheck_zero_array_size, 372 ArraySize->getSourceRange()); 373 } 374 } 375 T = Context.getConstantArrayType(T, ConstVal, ASM, ATI.TypeQuals); 376 } 377 // If this is not C99, extwarn about VLA's and C99 array size modifiers. 378 if (!getLangOptions().C99 && 379 (ASM != ArrayType::Normal || 380 (ArraySize && !ArraySize->isIntegerConstantExpr(Context)))) 381 Diag(D.getIdentifierLoc(), diag::ext_vla); 382 break; 383 } 384 case DeclaratorChunk::Function: 385 // If the function declarator has a prototype (i.e. it is not () and 386 // does not have a K&R-style identifier list), then the arguments are part 387 // of the type, otherwise the argument list is (). 388 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun; 389 390 // C99 6.7.5.3p1: The return type may not be a function or array type. 391 if (T->isArrayType() || T->isFunctionType()) { 392 Diag(DeclType.Loc, diag::err_func_returning_array_function, 393 T.getAsString()); 394 T = Context.IntTy; 395 D.setInvalidType(true); 396 } 397 398 if (!FTI.hasPrototype) { 399 // Simple void foo(), where the incoming T is the result type. 400 T = Context.getFunctionTypeNoProto(T); 401 402 // C99 6.7.5.3p3: Reject int(x,y,z) when it's not a function definition. 403 if (FTI.NumArgs != 0) 404 Diag(FTI.ArgInfo[0].IdentLoc, diag::err_ident_list_in_fn_declaration); 405 406 } else { 407 // Otherwise, we have a function with an argument list that is 408 // potentially variadic. 409 llvm::SmallVector<QualType, 16> ArgTys; 410 411 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 412 ParmVarDecl *Param = (ParmVarDecl *)FTI.ArgInfo[i].Param; 413 QualType ArgTy = Param->getType(); 414 assert(!ArgTy.isNull() && "Couldn't parse type?"); 415 // 416 // Perform the default function/array conversion (C99 6.7.5.3p[7,8]). 417 // This matches the conversion that is done in 418 // Sema::ActOnParamDeclarator(). Without this conversion, the 419 // argument type in the function prototype *will not* match the 420 // type in ParmVarDecl (which makes the code generator unhappy). 421 // 422 // FIXME: We still apparently need the conversion in 423 // Sema::ActOnParamDeclarator(). This doesn't make any sense, since 424 // it should be driving off the type being created here. 425 // 426 // FIXME: If a source translation tool needs to see the original type, 427 // then we need to consider storing both types somewhere... 428 // 429 if (ArgTy->isArrayType()) { 430 ArgTy = Context.getArrayDecayedType(ArgTy); 431 } else if (ArgTy->isFunctionType()) 432 ArgTy = Context.getPointerType(ArgTy); 433 434 // Look for 'void'. void is allowed only as a single argument to a 435 // function with no other parameters (C99 6.7.5.3p10). We record 436 // int(void) as a FunctionTypeProto with an empty argument list. 437 else if (ArgTy->isVoidType()) { 438 // If this is something like 'float(int, void)', reject it. 'void' 439 // is an incomplete type (C99 6.2.5p19) and function decls cannot 440 // have arguments of incomplete type. 441 if (FTI.NumArgs != 1 || FTI.isVariadic) { 442 Diag(DeclType.Loc, diag::err_void_only_param); 443 ArgTy = Context.IntTy; 444 Param->setType(ArgTy); 445 } else if (FTI.ArgInfo[i].Ident) { 446 // Reject, but continue to parse 'int(void abc)'. 447 Diag(FTI.ArgInfo[i].IdentLoc, 448 diag::err_param_with_void_type); 449 ArgTy = Context.IntTy; 450 Param->setType(ArgTy); 451 } else { 452 // Reject, but continue to parse 'float(const void)'. 453 if (ArgTy.getCVRQualifiers()) 454 Diag(DeclType.Loc, diag::err_void_param_qualified); 455 456 // Do not add 'void' to the ArgTys list. 457 break; 458 } 459 } 460 461 ArgTys.push_back(ArgTy); 462 } 463 T = Context.getFunctionType(T, &ArgTys[0], ArgTys.size(), 464 FTI.isVariadic); 465 } 466 break; 467 } 468 469 // See if there are any attributes on this declarator chunk. 470 if (const AttributeList *AL = DeclType.getAttrs()) 471 ProcessTypeAttributeList(T, AL); 472 } 473 474 // If there were any type attributes applied to the decl itself (not the 475 // type, apply the type attribute to the type!) 476 if (const AttributeList *Attrs = D.getAttributes()) 477 ProcessTypeAttributeList(T, Attrs); 478 479 return T; 480} 481 482/// ObjCGetTypeForMethodDefinition - Builds the type for a method definition 483/// declarator 484QualType Sema::ObjCGetTypeForMethodDefinition(DeclTy *D) { 485 ObjCMethodDecl *MDecl = dyn_cast<ObjCMethodDecl>(static_cast<Decl *>(D)); 486 QualType T = MDecl->getResultType(); 487 llvm::SmallVector<QualType, 16> ArgTys; 488 489 // Add the first two invisible argument types for self and _cmd. 490 if (MDecl->isInstance()) { 491 QualType selfTy = Context.getObjCInterfaceType(MDecl->getClassInterface()); 492 selfTy = Context.getPointerType(selfTy); 493 ArgTys.push_back(selfTy); 494 } 495 else 496 ArgTys.push_back(Context.getObjCIdType()); 497 ArgTys.push_back(Context.getObjCSelType()); 498 499 for (int i = 0, e = MDecl->getNumParams(); i != e; ++i) { 500 ParmVarDecl *PDecl = MDecl->getParamDecl(i); 501 QualType ArgTy = PDecl->getType(); 502 assert(!ArgTy.isNull() && "Couldn't parse type?"); 503 // Perform the default function/array conversion (C99 6.7.5.3p[7,8]). 504 // This matches the conversion that is done in 505 // Sema::ActOnParamDeclarator(). 506 if (ArgTy->isArrayType()) 507 ArgTy = Context.getArrayDecayedType(ArgTy); 508 else if (ArgTy->isFunctionType()) 509 ArgTy = Context.getPointerType(ArgTy); 510 ArgTys.push_back(ArgTy); 511 } 512 T = Context.getFunctionType(T, &ArgTys[0], ArgTys.size(), 513 MDecl->isVariadic()); 514 return T; 515} 516 517Sema::TypeResult Sema::ActOnTypeName(Scope *S, Declarator &D) { 518 // C99 6.7.6: Type names have no identifier. This is already validated by 519 // the parser. 520 assert(D.getIdentifier() == 0 && "Type name should have no identifier!"); 521 522 QualType T = GetTypeForDeclarator(D, S); 523 524 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 525 526 // Check that there are no default arguments (C++ only). 527 if (getLangOptions().CPlusPlus) 528 CheckExtraCXXDefaultArguments(D); 529 530 // In this context, we *do not* check D.getInvalidType(). If the declarator 531 // type was invalid, GetTypeForDeclarator() still returns a "valid" type, 532 // though it will not reflect the user specified type. 533 return T.getAsOpaquePtr(); 534} 535 536 537 538//===----------------------------------------------------------------------===// 539// Type Attribute Processing 540//===----------------------------------------------------------------------===// 541 542/// HandleAddressSpaceTypeAttribute - Process an address_space attribute on the 543/// specified type. The attribute contains 1 argument, the id of the address 544/// space for the type. 545static void HandleAddressSpaceTypeAttribute(QualType &Type, 546 const AttributeList &Attr, Sema &S){ 547 // If this type is already address space qualified, reject it. 548 // Clause 6.7.3 - Type qualifiers: "No type shall be qualified by qualifiers 549 // for two or more different address spaces." 550 if (Type.getAddressSpace()) { 551 S.Diag(Attr.getLoc(), diag::err_attribute_address_multiple_qualifiers); 552 return; 553 } 554 555 // Check the attribute arguments. 556 if (Attr.getNumArgs() != 1) { 557 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments, 558 std::string("1")); 559 return; 560 } 561 Expr *ASArgExpr = static_cast<Expr *>(Attr.getArg(0)); 562 llvm::APSInt addrSpace(32); 563 if (!ASArgExpr->isIntegerConstantExpr(addrSpace, S.Context)) { 564 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_not_int, 565 ASArgExpr->getSourceRange()); 566 return; 567 } 568 569 unsigned ASIdx = static_cast<unsigned>(addrSpace.getZExtValue()); 570 Type = S.Context.getASQualType(Type, ASIdx); 571} 572 573void Sema::ProcessTypeAttributeList(QualType &Result, const AttributeList *AL) { 574 // Scan through and apply attributes to this type where it makes sense. Some 575 // attributes (such as __address_space__, __vector_size__, etc) apply to the 576 // type, but others can be present in the type specifiers even though they 577 // apply to the decl. Here we apply type attributes and ignore the rest. 578 for (; AL; AL = AL->getNext()) { 579 // If this is an attribute we can handle, do so now, otherwise, add it to 580 // the LeftOverAttrs list for rechaining. 581 switch (AL->getKind()) { 582 default: break; 583 case AttributeList::AT_address_space: 584 HandleAddressSpaceTypeAttribute(Result, *AL, *this); 585 break; 586 } 587 } 588} 589 590 591