SemaType.cpp revision 2e78db3510b136b3f961af202e6a1a3df4839172
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/Parse/DeclSpec.h" 19#include "clang/Basic/LangOptions.h" 20using namespace clang; 21 22/// ConvertDeclSpecToType - Convert the specified declspec to the appropriate 23/// type object. This returns null on error. 24QualType Sema::ConvertDeclSpecToType(DeclSpec &DS) { 25 // FIXME: Should move the logic from DeclSpec::Finish to here for validity 26 // checking. 27 QualType Result; 28 29 switch (DS.getTypeSpecType()) { 30 default: assert(0 && "Unknown TypeSpecType!"); 31 case DeclSpec::TST_void: 32 Result = Context.VoidTy; 33 break; 34 case DeclSpec::TST_char: 35 if (DS.getTypeSpecSign() == DeclSpec::TSS_unspecified) 36 Result = Context.CharTy; 37 else if (DS.getTypeSpecSign() == DeclSpec::TSS_signed) 38 Result = Context.SignedCharTy; 39 else { 40 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unsigned && 41 "Unknown TSS value"); 42 Result = Context.UnsignedCharTy; 43 } 44 break; 45 case DeclSpec::TST_unspecified: 46 // Unspecified typespec defaults to int in C90. However, the C90 grammar 47 // [C90 6.5] only allows a decl-spec if there was *some* type-specifier, 48 // type-qualifier, or storage-class-specifier. If not, emit an extwarn. 49 // Note that the one exception to this is function definitions, which are 50 // allowed to be completely missing a declspec. This is handled in the 51 // parser already though by it pretending to have seen an 'int' in this 52 // case. 53 if (getLangOptions().ImplicitInt) { 54 if ((DS.getParsedSpecifiers() & (DeclSpec::PQ_StorageClassSpecifier | 55 DeclSpec::PQ_TypeSpecifier | 56 DeclSpec::PQ_TypeQualifier)) == 0) 57 Diag(DS.getSourceRange().getBegin(), diag::ext_missing_declspec); 58 } else { 59 // C99 and C++ require a type specifier. For example, C99 6.7.2p2 says: 60 // "At least one type specifier shall be given in the declaration 61 // specifiers in each declaration, and in the specifier-qualifier list in 62 // each struct declaration and type name." 63 if (!DS.hasTypeSpecifier()) 64 Diag(DS.getSourceRange().getBegin(), diag::ext_missing_type_specifier); 65 } 66 67 // FALL THROUGH. 68 case DeclSpec::TST_int: { 69 if (DS.getTypeSpecSign() != DeclSpec::TSS_unsigned) { 70 switch (DS.getTypeSpecWidth()) { 71 case DeclSpec::TSW_unspecified: Result = Context.IntTy; break; 72 case DeclSpec::TSW_short: Result = Context.ShortTy; break; 73 case DeclSpec::TSW_long: Result = Context.LongTy; break; 74 case DeclSpec::TSW_longlong: Result = Context.LongLongTy; break; 75 } 76 } else { 77 switch (DS.getTypeSpecWidth()) { 78 case DeclSpec::TSW_unspecified: Result = Context.UnsignedIntTy; break; 79 case DeclSpec::TSW_short: Result = Context.UnsignedShortTy; break; 80 case DeclSpec::TSW_long: Result = Context.UnsignedLongTy; break; 81 case DeclSpec::TSW_longlong: Result =Context.UnsignedLongLongTy; break; 82 } 83 } 84 break; 85 } 86 case DeclSpec::TST_float: Result = Context.FloatTy; break; 87 case DeclSpec::TST_double: 88 if (DS.getTypeSpecWidth() == DeclSpec::TSW_long) 89 Result = Context.LongDoubleTy; 90 else 91 Result = Context.DoubleTy; 92 break; 93 case DeclSpec::TST_bool: Result = Context.BoolTy; break; // _Bool or bool 94 case DeclSpec::TST_decimal32: // _Decimal32 95 case DeclSpec::TST_decimal64: // _Decimal64 96 case DeclSpec::TST_decimal128: // _Decimal128 97 assert(0 && "FIXME: GNU decimal extensions not supported yet!"); 98 case DeclSpec::TST_class: 99 case DeclSpec::TST_enum: 100 case DeclSpec::TST_union: 101 case DeclSpec::TST_struct: { 102 Decl *D = static_cast<Decl *>(DS.getTypeRep()); 103 assert(D && "Didn't get a decl for a class/enum/union/struct?"); 104 assert(DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 && 105 DS.getTypeSpecSign() == 0 && 106 "Can't handle qualifiers on typedef names yet!"); 107 // TypeQuals handled by caller. 108 Result = Context.getTagDeclType(cast<TagDecl>(D)); 109 break; 110 } 111 case DeclSpec::TST_typedef: { 112 Decl *D = static_cast<Decl *>(DS.getTypeRep()); 113 assert(D && "Didn't get a decl for a typedef?"); 114 assert(DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 && 115 DS.getTypeSpecSign() == 0 && 116 "Can't handle qualifiers on typedef names yet!"); 117 // FIXME: Adding a TST_objcInterface clause doesn't seem ideal, so 118 // we have this "hack" for now... 119 if (ObjCInterfaceDecl *ObjCIntDecl = dyn_cast<ObjCInterfaceDecl>(D)) { 120 if (DS.getProtocolQualifiers() == 0) { 121 Result = Context.getObjCInterfaceType(ObjCIntDecl); 122 break; 123 } 124 125 Action::DeclTy **PPDecl = &(*DS.getProtocolQualifiers())[0]; 126 Result = Context.getObjCQualifiedInterfaceType(ObjCIntDecl, 127 reinterpret_cast<ObjCProtocolDecl**>(PPDecl), 128 DS.getNumProtocolQualifiers()); 129 break; 130 } 131 else if (TypedefDecl *typeDecl = dyn_cast<TypedefDecl>(D)) { 132 if (Context.getObjCIdType() == Context.getTypedefType(typeDecl) 133 && DS.getProtocolQualifiers()) { 134 // id<protocol-list> 135 Action::DeclTy **PPDecl = &(*DS.getProtocolQualifiers())[0]; 136 Result = Context.getObjCQualifiedIdType(typeDecl->getUnderlyingType(), 137 reinterpret_cast<ObjCProtocolDecl**>(PPDecl), 138 DS.getNumProtocolQualifiers()); 139 break; 140 } 141 } 142 // TypeQuals handled by caller. 143 Result = Context.getTypedefType(cast<TypedefDecl>(D)); 144 break; 145 } 146 case DeclSpec::TST_typeofType: 147 Result = QualType::getFromOpaquePtr(DS.getTypeRep()); 148 assert(!Result.isNull() && "Didn't get a type for typeof?"); 149 // TypeQuals handled by caller. 150 Result = Context.getTypeOfType(Result); 151 break; 152 case DeclSpec::TST_typeofExpr: { 153 Expr *E = static_cast<Expr *>(DS.getTypeRep()); 154 assert(E && "Didn't get an expression for typeof?"); 155 // TypeQuals handled by caller. 156 Result = Context.getTypeOfExpr(E); 157 break; 158 } 159 } 160 161 // Handle complex types. 162 if (DS.getTypeSpecComplex() == DeclSpec::TSC_complex) 163 Result = Context.getComplexType(Result); 164 165 assert(DS.getTypeSpecComplex() != DeclSpec::TSC_imaginary && 166 "FIXME: imaginary types not supported yet!"); 167 168 // See if there are any attributes on the declspec that apply to the type (as 169 // opposed to the decl). 170 if (AttributeList *AL = DS.getAttributes()) 171 DS.SetAttributes(ProcessTypeAttributes(Result, AL)); 172 173 // Apply const/volatile/restrict qualifiers to T. 174 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 175 176 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 177 // or incomplete types shall not be restrict-qualified." C++ also allows 178 // restrict-qualified references. 179 if (TypeQuals & QualType::Restrict) { 180 if (const PointerLikeType *PT = Result->getAsPointerLikeType()) { 181 QualType EltTy = PT->getPointeeType(); 182 183 // If we have a pointer or reference, the pointee must have an object or 184 // incomplete type. 185 if (!EltTy->isIncompleteOrObjectType()) { 186 Diag(DS.getRestrictSpecLoc(), 187 diag::err_typecheck_invalid_restrict_invalid_pointee, 188 EltTy.getAsString(), DS.getSourceRange()); 189 TypeQuals &= ~QualType::Restrict; // Remove the restrict qualifier. 190 } 191 } else { 192 Diag(DS.getRestrictSpecLoc(), 193 diag::err_typecheck_invalid_restrict_not_pointer, 194 Result.getAsString(), DS.getSourceRange()); 195 TypeQuals &= ~QualType::Restrict; // Remove the restrict qualifier. 196 } 197 } 198 199 // Warn about CV qualifiers on functions: C99 6.7.3p8: "If the specification 200 // of a function type includes any type qualifiers, the behavior is 201 // undefined." 202 if (Result->isFunctionType() && TypeQuals) { 203 // Get some location to point at, either the C or V location. 204 SourceLocation Loc; 205 if (TypeQuals & QualType::Const) 206 Loc = DS.getConstSpecLoc(); 207 else { 208 assert((TypeQuals & QualType::Volatile) && 209 "Has CV quals but not C or V?"); 210 Loc = DS.getVolatileSpecLoc(); 211 } 212 Diag(Loc, diag::warn_typecheck_function_qualifiers, 213 Result.getAsString(), DS.getSourceRange()); 214 } 215 216 Result = Result.getQualifiedType(TypeQuals); 217 } 218 return Result; 219} 220 221/// GetTypeForDeclarator - Convert the type for the specified declarator to Type 222/// instances. 223QualType Sema::GetTypeForDeclarator(Declarator &D, Scope *S) { 224 // long long is a C99 feature. 225 if (!getLangOptions().C99 && !getLangOptions().CPlusPlus0x && 226 D.getDeclSpec().getTypeSpecWidth() == DeclSpec::TSW_longlong) 227 Diag(D.getDeclSpec().getTypeSpecWidthLoc(), diag::ext_longlong); 228 229 QualType T = ConvertDeclSpecToType(D.getDeclSpec()); 230 231 // Walk the DeclTypeInfo, building the recursive type as we go. DeclTypeInfos 232 // are ordered from the identifier out, which is opposite of what we want :). 233 for (unsigned i = 0, e = D.getNumTypeObjects(); i != e; ++i) { 234 DeclaratorChunk &DeclType = D.getTypeObject(e-i-1); 235 switch (DeclType.Kind) { 236 default: assert(0 && "Unknown decltype!"); 237 case DeclaratorChunk::Pointer: 238 if (T->isReferenceType()) { 239 // C++ 8.3.2p4: There shall be no ... pointers to references ... 240 Diag(DeclType.Loc, diag::err_illegal_decl_pointer_to_reference, 241 D.getIdentifier() ? D.getIdentifier()->getName() : "type name"); 242 D.setInvalidType(true); 243 T = Context.IntTy; 244 } 245 246 // Enforce C99 6.7.3p2: "Types other than pointer types derived from 247 // object or incomplete types shall not be restrict-qualified." 248 if ((DeclType.Ptr.TypeQuals & QualType::Restrict) && 249 !T->isIncompleteOrObjectType()) { 250 Diag(DeclType.Loc, 251 diag::err_typecheck_invalid_restrict_invalid_pointee, 252 T.getAsString()); 253 DeclType.Ptr.TypeQuals &= QualType::Restrict; 254 } 255 256 // Apply the pointer typequals to the pointer object. 257 T = Context.getPointerType(T).getQualifiedType(DeclType.Ptr.TypeQuals); 258 259 // See if there are any attributes on the pointer that apply to it. 260 if (AttributeList *AL = DeclType.Ptr.AttrList) 261 DeclType.Ptr.AttrList = ProcessTypeAttributes(T, AL); 262 263 break; 264 case DeclaratorChunk::Reference: 265 if (const ReferenceType *RT = T->getAsReferenceType()) { 266 // C++ 8.3.2p4: There shall be no references to references. 267 Diag(DeclType.Loc, diag::err_illegal_decl_reference_to_reference, 268 D.getIdentifier() ? D.getIdentifier()->getName() : "type name"); 269 D.setInvalidType(true); 270 T = RT->getPointeeType(); 271 } 272 273 // Enforce C99 6.7.3p2: "Types other than pointer types derived from 274 // object or incomplete types shall not be restrict-qualified." 275 if (DeclType.Ref.HasRestrict && 276 !T->isIncompleteOrObjectType()) { 277 Diag(DeclType.Loc, 278 diag::err_typecheck_invalid_restrict_invalid_pointee, 279 T.getAsString()); 280 DeclType.Ref.HasRestrict = false; 281 } 282 283 T = Context.getReferenceType(T); 284 285 // Handle restrict on references. 286 if (DeclType.Ref.HasRestrict) 287 T.addRestrict(); 288 289 // See if there are any attributes on the pointer that apply to it. 290 if (AttributeList *AL = DeclType.Ref.AttrList) 291 DeclType.Ref.AttrList = ProcessTypeAttributes(T, AL); 292 break; 293 case DeclaratorChunk::Array: { 294 DeclaratorChunk::ArrayTypeInfo &ATI = DeclType.Arr; 295 Expr *ArraySize = static_cast<Expr*>(ATI.NumElts); 296 ArrayType::ArraySizeModifier ASM; 297 if (ATI.isStar) 298 ASM = ArrayType::Star; 299 else if (ATI.hasStatic) 300 ASM = ArrayType::Static; 301 else 302 ASM = ArrayType::Normal; 303 304 // C99 6.7.5.2p1: If the element type is an incomplete or function type, 305 // reject it (e.g. void ary[7], struct foo ary[7], void ary[7]()) 306 if (T->isIncompleteType()) { 307 Diag(D.getIdentifierLoc(), diag::err_illegal_decl_array_incomplete_type, 308 T.getAsString()); 309 T = Context.IntTy; 310 D.setInvalidType(true); 311 } else if (T->isFunctionType()) { 312 Diag(D.getIdentifierLoc(), diag::err_illegal_decl_array_of_functions, 313 D.getIdentifier() ? D.getIdentifier()->getName() : "type name"); 314 T = Context.getPointerType(T); 315 D.setInvalidType(true); 316 } else if (const ReferenceType *RT = T->getAsReferenceType()) { 317 // C++ 8.3.2p4: There shall be no ... arrays of references ... 318 Diag(D.getIdentifierLoc(), diag::err_illegal_decl_array_of_references, 319 D.getIdentifier() ? D.getIdentifier()->getName() : "type name"); 320 T = RT->getPointeeType(); 321 D.setInvalidType(true); 322 } else if (const RecordType *EltTy = T->getAsRecordType()) { 323 // If the element type is a struct or union that contains a variadic 324 // array, reject it: C99 6.7.2.1p2. 325 if (EltTy->getDecl()->hasFlexibleArrayMember()) { 326 Diag(DeclType.Loc, diag::err_flexible_array_in_array, 327 T.getAsString()); 328 T = Context.IntTy; 329 D.setInvalidType(true); 330 } 331 } 332 // C99 6.7.5.2p1: The size expression shall have integer type. 333 if (ArraySize && !ArraySize->getType()->isIntegerType()) { 334 Diag(ArraySize->getLocStart(), diag::err_array_size_non_int, 335 ArraySize->getType().getAsString(), ArraySize->getSourceRange()); 336 D.setInvalidType(true); 337 delete ArraySize; 338 ATI.NumElts = ArraySize = 0; 339 } 340 llvm::APSInt ConstVal(32); 341 // If no expression was provided, we consider it an incomplete array. 342 if (!ArraySize) { 343 T = Context.getIncompleteArrayType(T, ASM, ATI.TypeQuals); 344 } else if (!ArraySize->isIntegerConstantExpr(ConstVal, Context)) { 345 T = Context.getVariableArrayType(T, ArraySize, ASM, ATI.TypeQuals); 346 } else { 347 // C99 6.7.5.2p1: If the expression is a constant expression, it shall 348 // have a value greater than zero. 349 if (ConstVal.isSigned()) { 350 if (ConstVal.isNegative()) { 351 Diag(ArraySize->getLocStart(), 352 diag::err_typecheck_negative_array_size, 353 ArraySize->getSourceRange()); 354 D.setInvalidType(true); 355 } else if (ConstVal == 0) { 356 // GCC accepts zero sized static arrays. 357 Diag(ArraySize->getLocStart(), diag::ext_typecheck_zero_array_size, 358 ArraySize->getSourceRange()); 359 } 360 } 361 T = Context.getConstantArrayType(T, ConstVal, ASM, ATI.TypeQuals); 362 } 363 // If this is not C99, extwarn about VLA's and C99 array size modifiers. 364 if (!getLangOptions().C99 && 365 (ASM != ArrayType::Normal || 366 (ArraySize && !ArraySize->isIntegerConstantExpr(Context)))) 367 Diag(D.getIdentifierLoc(), diag::ext_vla); 368 break; 369 } 370 case DeclaratorChunk::Function: 371 // If the function declarator has a prototype (i.e. it is not () and 372 // does not have a K&R-style identifier list), then the arguments are part 373 // of the type, otherwise the argument list is (). 374 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun; 375 376 // C99 6.7.5.3p1: The return type may not be a function or array type. 377 if (T->isArrayType() || T->isFunctionType()) { 378 Diag(DeclType.Loc, diag::err_func_returning_array_function, 379 T.getAsString()); 380 T = Context.IntTy; 381 D.setInvalidType(true); 382 } 383 384 if (!FTI.hasPrototype) { 385 // Simple void foo(), where the incoming T is the result type. 386 T = Context.getFunctionTypeNoProto(T); 387 388 // C99 6.7.5.3p3: Reject int(x,y,z) when it's not a function definition. 389 if (FTI.NumArgs != 0) 390 Diag(FTI.ArgInfo[0].IdentLoc, diag::err_ident_list_in_fn_declaration); 391 392 } else { 393 // Otherwise, we have a function with an argument list that is 394 // potentially variadic. 395 llvm::SmallVector<QualType, 16> ArgTys; 396 397 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 398 ParmVarDecl *Param = (ParmVarDecl *)FTI.ArgInfo[i].Param; 399 QualType ArgTy = Param->getType(); 400 assert(!ArgTy.isNull() && "Couldn't parse type?"); 401 // 402 // Perform the default function/array conversion (C99 6.7.5.3p[7,8]). 403 // This matches the conversion that is done in 404 // Sema::ActOnParamDeclarator(). Without this conversion, the 405 // argument type in the function prototype *will not* match the 406 // type in ParmVarDecl (which makes the code generator unhappy). 407 // 408 // FIXME: We still apparently need the conversion in 409 // Sema::ActOnParamDeclarator(). This doesn't make any sense, since 410 // it should be driving off the type being created here. 411 // 412 // FIXME: If a source translation tool needs to see the original type, 413 // then we need to consider storing both types somewhere... 414 // 415 if (ArgTy->isArrayType()) { 416 ArgTy = Context.getArrayDecayedType(ArgTy); 417 } else if (ArgTy->isFunctionType()) 418 ArgTy = Context.getPointerType(ArgTy); 419 420 // Look for 'void'. void is allowed only as a single argument to a 421 // function with no other parameters (C99 6.7.5.3p10). We record 422 // int(void) as a FunctionTypeProto with an empty argument list. 423 else if (ArgTy->isVoidType()) { 424 // If this is something like 'float(int, void)', reject it. 'void' 425 // is an incomplete type (C99 6.2.5p19) and function decls cannot 426 // have arguments of incomplete type. 427 if (FTI.NumArgs != 1 || FTI.isVariadic) { 428 Diag(DeclType.Loc, diag::err_void_only_param); 429 ArgTy = Context.IntTy; 430 Param->setType(ArgTy); 431 } else if (FTI.ArgInfo[i].Ident) { 432 // Reject, but continue to parse 'int(void abc)'. 433 Diag(FTI.ArgInfo[i].IdentLoc, 434 diag::err_param_with_void_type); 435 ArgTy = Context.IntTy; 436 Param->setType(ArgTy); 437 } else { 438 // Reject, but continue to parse 'float(const void)'. 439 if (ArgTy.getCVRQualifiers()) 440 Diag(DeclType.Loc, diag::err_void_param_qualified); 441 442 // Do not add 'void' to the ArgTys list. 443 break; 444 } 445 } 446 447 ArgTys.push_back(ArgTy); 448 } 449 T = Context.getFunctionType(T, &ArgTys[0], ArgTys.size(), 450 FTI.isVariadic); 451 } 452 break; 453 } 454 } 455 456 return T; 457} 458 459/// ObjCGetTypeForMethodDefinition - Builds the type for a method definition 460/// declarator 461QualType Sema::ObjCGetTypeForMethodDefinition(DeclTy *D) { 462 ObjCMethodDecl *MDecl = dyn_cast<ObjCMethodDecl>(static_cast<Decl *>(D)); 463 QualType T = MDecl->getResultType(); 464 llvm::SmallVector<QualType, 16> ArgTys; 465 466 // Add the first two invisible argument types for self and _cmd. 467 if (MDecl->isInstance()) { 468 QualType selfTy = Context.getObjCInterfaceType(MDecl->getClassInterface()); 469 selfTy = Context.getPointerType(selfTy); 470 ArgTys.push_back(selfTy); 471 } 472 else 473 ArgTys.push_back(Context.getObjCIdType()); 474 ArgTys.push_back(Context.getObjCSelType()); 475 476 for (int i = 0, e = MDecl->getNumParams(); i != e; ++i) { 477 ParmVarDecl *PDecl = MDecl->getParamDecl(i); 478 QualType ArgTy = PDecl->getType(); 479 assert(!ArgTy.isNull() && "Couldn't parse type?"); 480 // Perform the default function/array conversion (C99 6.7.5.3p[7,8]). 481 // This matches the conversion that is done in 482 // Sema::ActOnParamDeclarator(). 483 if (ArgTy->isArrayType()) 484 ArgTy = Context.getArrayDecayedType(ArgTy); 485 else if (ArgTy->isFunctionType()) 486 ArgTy = Context.getPointerType(ArgTy); 487 ArgTys.push_back(ArgTy); 488 } 489 T = Context.getFunctionType(T, &ArgTys[0], ArgTys.size(), 490 MDecl->isVariadic()); 491 return T; 492} 493 494Sema::TypeResult Sema::ActOnTypeName(Scope *S, Declarator &D) { 495 // C99 6.7.6: Type names have no identifier. This is already validated by 496 // the parser. 497 assert(D.getIdentifier() == 0 && "Type name should have no identifier!"); 498 499 QualType T = GetTypeForDeclarator(D, S); 500 501 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 502 503 // In this context, we *do not* check D.getInvalidType(). If the declarator 504 // type was invalid, GetTypeForDeclarator() still returns a "valid" type, 505 // though it will not reflect the user specified type. 506 return T.getAsOpaquePtr(); 507} 508 509AttributeList *Sema::ProcessTypeAttributes(QualType &Result, AttributeList *AL){ 510 // Scan through and apply attributes to this type where it makes sense. Some 511 // attributes (such as __address_space__, __vector_size__, etc) apply to the 512 // type, but others can be present in the type specifiers even though they 513 // apply to the decl. Here we apply and delete attributes that apply to the 514 // type and leave the others alone. 515 llvm::SmallVector<AttributeList *, 8> LeftOverAttrs; 516 while (AL) { 517 // Unlink this attribute from the chain, so we can process it independently. 518 AttributeList *ThisAttr = AL; 519 AL = AL->getNext(); 520 ThisAttr->setNext(0); 521 522 // If this is an attribute we can handle, do so now, otherwise, add it to 523 // the LeftOverAttrs list for rechaining. 524 switch (ThisAttr->getKind()) { 525 default: break; 526 case AttributeList::AT_address_space: 527 Result = HandleAddressSpaceTypeAttribute(Result, ThisAttr); 528 delete ThisAttr; // Consume the attribute. 529 continue; 530 } 531 532 LeftOverAttrs.push_back(ThisAttr); 533 } 534 535 // Rechain any attributes that haven't been deleted to the DeclSpec. 536 AttributeList *List = 0; 537 for (unsigned i = 0, e = LeftOverAttrs.size(); i != e; ++i) { 538 LeftOverAttrs[i]->setNext(List); 539 List = LeftOverAttrs[i]; 540 } 541 542 return List; 543} 544 545/// HandleAddressSpaceTypeAttribute - Process an address_space attribute on the 546/// specified type. 547QualType Sema::HandleAddressSpaceTypeAttribute(QualType Type, 548 AttributeList *Attr) { 549 // If this type is already address space qualified, reject it. 550 // Clause 6.7.3 - Type qualifiers: "No type shall be qualified by qualifiers 551 // for two or more different address spaces." 552 if (Type.getAddressSpace()) { 553 Diag(Attr->getLoc(), diag::err_attribute_address_multiple_qualifiers); 554 return Type; 555 } 556 557 // Check the attribute arguments. 558 if (Attr->getNumArgs() != 1) { 559 Diag(Attr->getLoc(), diag::err_attribute_wrong_number_arguments, 560 std::string("1")); 561 return Type; 562 } 563 Expr *ASArgExpr = static_cast<Expr *>(Attr->getArg(0)); 564 llvm::APSInt addrSpace(32); 565 if (!ASArgExpr->isIntegerConstantExpr(addrSpace, Context)) { 566 Diag(Attr->getLoc(), diag::err_attribute_address_space_not_int, 567 ASArgExpr->getSourceRange()); 568 return Type; 569 } 570 571 unsigned ASIdx = static_cast<unsigned>(addrSpace.getZExtValue()); 572 return Context.getASQualType(Type, ASIdx); 573} 574 575