SemaType.cpp revision 5fd818bec0c21e3072679d1a9a522be2649405d8
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/DeclObjC.h" 17#include "clang/AST/Expr.h" 18#include "clang/Parse/DeclSpec.h" 19using namespace clang; 20 21/// \brief Convert the specified declspec to the appropriate type 22/// object. 23/// \param DS the declaration specifiers 24/// \returns The type described by the declaration specifiers, or NULL 25/// if there was an 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 case DeclSpec::TST_void: 33 Result = Context.VoidTy; 34 break; 35 case DeclSpec::TST_char: 36 if (DS.getTypeSpecSign() == DeclSpec::TSS_unspecified) 37 Result = Context.CharTy; 38 else if (DS.getTypeSpecSign() == DeclSpec::TSS_signed) 39 Result = Context.SignedCharTy; 40 else { 41 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unsigned && 42 "Unknown TSS value"); 43 Result = Context.UnsignedCharTy; 44 } 45 break; 46 case DeclSpec::TST_wchar: 47 if (DS.getTypeSpecSign() == DeclSpec::TSS_unspecified) 48 Result = Context.WCharTy; 49 else if (DS.getTypeSpecSign() == DeclSpec::TSS_signed) { 50 Diag(DS.getTypeSpecSignLoc(), diag::ext_invalid_sign_spec) 51 << DS.getSpecifierName(DS.getTypeSpecType()); 52 Result = Context.getSignedWCharType(); 53 } else { 54 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unsigned && 55 "Unknown TSS value"); 56 Diag(DS.getTypeSpecSignLoc(), diag::ext_invalid_sign_spec) 57 << DS.getSpecifierName(DS.getTypeSpecType()); 58 Result = Context.getUnsignedWCharType(); 59 } 60 break; 61 case DeclSpec::TST_unspecified: 62 // "<proto1,proto2>" is an objc qualified ID with a missing id. 63 if (DeclSpec::ProtocolQualifierListTy PQ = DS.getProtocolQualifiers()) { 64 Result = Context.getObjCQualifiedIdType((ObjCProtocolDecl**)PQ, 65 DS.getNumProtocolQualifiers()); 66 break; 67 } 68 69 // Unspecified typespec defaults to int in C90. However, the C90 grammar 70 // [C90 6.5] only allows a decl-spec if there was *some* type-specifier, 71 // type-qualifier, or storage-class-specifier. If not, emit an extwarn. 72 // Note that the one exception to this is function definitions, which are 73 // allowed to be completely missing a declspec. This is handled in the 74 // parser already though by it pretending to have seen an 'int' in this 75 // case. 76 if (getLangOptions().ImplicitInt) { 77 if ((DS.getParsedSpecifiers() & (DeclSpec::PQ_StorageClassSpecifier | 78 DeclSpec::PQ_TypeSpecifier | 79 DeclSpec::PQ_TypeQualifier)) == 0) 80 Diag(DS.getSourceRange().getBegin(), diag::ext_missing_declspec); 81 } else if (!DS.hasTypeSpecifier()) { 82 // C99 and C++ require a type specifier. For example, C99 6.7.2p2 says: 83 // "At least one type specifier shall be given in the declaration 84 // specifiers in each declaration, and in the specifier-qualifier list in 85 // each struct declaration and type name." 86 // FIXME: Does Microsoft really have the implicit int extension in C++? 87 unsigned DK = getLangOptions().CPlusPlus && !getLangOptions().Microsoft? 88 diag::err_missing_type_specifier 89 : diag::ext_missing_type_specifier; 90 Diag(DS.getSourceRange().getBegin(), DK); 91 } 92 93 // FALL THROUGH. 94 case DeclSpec::TST_int: { 95 if (DS.getTypeSpecSign() != DeclSpec::TSS_unsigned) { 96 switch (DS.getTypeSpecWidth()) { 97 case DeclSpec::TSW_unspecified: Result = Context.IntTy; break; 98 case DeclSpec::TSW_short: Result = Context.ShortTy; break; 99 case DeclSpec::TSW_long: Result = Context.LongTy; break; 100 case DeclSpec::TSW_longlong: Result = Context.LongLongTy; break; 101 } 102 } else { 103 switch (DS.getTypeSpecWidth()) { 104 case DeclSpec::TSW_unspecified: Result = Context.UnsignedIntTy; break; 105 case DeclSpec::TSW_short: Result = Context.UnsignedShortTy; break; 106 case DeclSpec::TSW_long: Result = Context.UnsignedLongTy; break; 107 case DeclSpec::TSW_longlong: Result =Context.UnsignedLongLongTy; break; 108 } 109 } 110 break; 111 } 112 case DeclSpec::TST_float: Result = Context.FloatTy; break; 113 case DeclSpec::TST_double: 114 if (DS.getTypeSpecWidth() == DeclSpec::TSW_long) 115 Result = Context.LongDoubleTy; 116 else 117 Result = Context.DoubleTy; 118 break; 119 case DeclSpec::TST_bool: Result = Context.BoolTy; break; // _Bool or bool 120 case DeclSpec::TST_decimal32: // _Decimal32 121 case DeclSpec::TST_decimal64: // _Decimal64 122 case DeclSpec::TST_decimal128: // _Decimal128 123 assert(0 && "FIXME: GNU decimal extensions not supported yet!"); 124 case DeclSpec::TST_class: 125 case DeclSpec::TST_enum: 126 case DeclSpec::TST_union: 127 case DeclSpec::TST_struct: { 128 Decl *D = static_cast<Decl *>(DS.getTypeRep()); 129 assert(D && "Didn't get a decl for a class/enum/union/struct?"); 130 assert(DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 && 131 DS.getTypeSpecSign() == 0 && 132 "Can't handle qualifiers on typedef names yet!"); 133 // TypeQuals handled by caller. 134 Result = Context.getTypeDeclType(cast<TypeDecl>(D)); 135 break; 136 } 137 case DeclSpec::TST_typename: { 138 assert(DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 && 139 DS.getTypeSpecSign() == 0 && 140 "Can't handle qualifiers on typedef names yet!"); 141 Result = QualType::getFromOpaquePtr(DS.getTypeRep()); 142 143 if (DeclSpec::ProtocolQualifierListTy PQ = DS.getProtocolQualifiers()) { 144 // FIXME: Adding a TST_objcInterface clause doesn't seem ideal, so 145 // we have this "hack" for now... 146 if (const ObjCInterfaceType *Interface = Result->getAsObjCInterfaceType()) 147 Result = Context.getObjCQualifiedInterfaceType(Interface->getDecl(), 148 (ObjCProtocolDecl**)PQ, 149 DS.getNumProtocolQualifiers()); 150 else if (Result == Context.getObjCIdType()) 151 // id<protocol-list> 152 Result = Context.getObjCQualifiedIdType((ObjCProtocolDecl**)PQ, 153 DS.getNumProtocolQualifiers()); 154 else if (Result == Context.getObjCClassType()) 155 // Class<protocol-list> 156 Diag(DS.getSourceRange().getBegin(), 157 diag::err_qualified_class_unsupported) << DS.getSourceRange(); 158 else 159 Diag(DS.getSourceRange().getBegin(), 160 diag::err_invalid_protocol_qualifiers) << DS.getSourceRange(); 161 } 162 // TypeQuals handled by caller. 163 break; 164 } 165 case DeclSpec::TST_typeofType: 166 Result = QualType::getFromOpaquePtr(DS.getTypeRep()); 167 assert(!Result.isNull() && "Didn't get a type for typeof?"); 168 // TypeQuals handled by caller. 169 Result = Context.getTypeOfType(Result); 170 break; 171 case DeclSpec::TST_typeofExpr: { 172 Expr *E = static_cast<Expr *>(DS.getTypeRep()); 173 assert(E && "Didn't get an expression for typeof?"); 174 // TypeQuals handled by caller. 175 Result = Context.getTypeOfExpr(E); 176 break; 177 } 178 case DeclSpec::TST_error: 179 return QualType(); 180 } 181 182 // Handle complex types. 183 if (DS.getTypeSpecComplex() == DeclSpec::TSC_complex) { 184 if (getLangOptions().Freestanding) 185 Diag(DS.getTypeSpecComplexLoc(), diag::ext_freestanding_complex); 186 Result = Context.getComplexType(Result); 187 } 188 189 assert(DS.getTypeSpecComplex() != DeclSpec::TSC_imaginary && 190 "FIXME: imaginary types not supported yet!"); 191 192 // See if there are any attributes on the declspec that apply to the type (as 193 // opposed to the decl). 194 if (const AttributeList *AL = DS.getAttributes()) 195 ProcessTypeAttributeList(Result, AL); 196 197 // Apply const/volatile/restrict qualifiers to T. 198 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 199 200 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 201 // or incomplete types shall not be restrict-qualified." C++ also allows 202 // restrict-qualified references. 203 if (TypeQuals & QualType::Restrict) { 204 if (const PointerLikeType *PT = Result->getAsPointerLikeType()) { 205 QualType EltTy = PT->getPointeeType(); 206 207 // If we have a pointer or reference, the pointee must have an object or 208 // incomplete type. 209 if (!EltTy->isIncompleteOrObjectType()) { 210 Diag(DS.getRestrictSpecLoc(), 211 diag::err_typecheck_invalid_restrict_invalid_pointee) 212 << EltTy << DS.getSourceRange(); 213 TypeQuals &= ~QualType::Restrict; // Remove the restrict qualifier. 214 } 215 } else { 216 Diag(DS.getRestrictSpecLoc(), 217 diag::err_typecheck_invalid_restrict_not_pointer) 218 << Result << DS.getSourceRange(); 219 TypeQuals &= ~QualType::Restrict; // Remove the restrict qualifier. 220 } 221 } 222 223 // Warn about CV qualifiers on functions: C99 6.7.3p8: "If the specification 224 // of a function type includes any type qualifiers, the behavior is 225 // undefined." 226 if (Result->isFunctionType() && TypeQuals) { 227 // Get some location to point at, either the C or V location. 228 SourceLocation Loc; 229 if (TypeQuals & QualType::Const) 230 Loc = DS.getConstSpecLoc(); 231 else { 232 assert((TypeQuals & QualType::Volatile) && 233 "Has CV quals but not C or V?"); 234 Loc = DS.getVolatileSpecLoc(); 235 } 236 Diag(Loc, diag::warn_typecheck_function_qualifiers) 237 << Result << DS.getSourceRange(); 238 } 239 240 // C++ [dcl.ref]p1: 241 // Cv-qualified references are ill-formed except when the 242 // cv-qualifiers are introduced through the use of a typedef 243 // (7.1.3) or of a template type argument (14.3), in which 244 // case the cv-qualifiers are ignored. 245 // FIXME: Shouldn't we be checking SCS_typedef here? 246 if (DS.getTypeSpecType() == DeclSpec::TST_typename && 247 TypeQuals && Result->isReferenceType()) { 248 TypeQuals &= ~QualType::Const; 249 TypeQuals &= ~QualType::Volatile; 250 } 251 252 Result = Result.getQualifiedType(TypeQuals); 253 } 254 return Result; 255} 256 257/// GetTypeForDeclarator - Convert the type for the specified 258/// declarator to Type instances. Skip the outermost Skip type 259/// objects. 260QualType Sema::GetTypeForDeclarator(Declarator &D, Scope *S, unsigned Skip) { 261 bool OmittedReturnType = false; 262 263 if (D.getContext() == Declarator::BlockLiteralContext 264 && Skip == 0 265 && !D.getDeclSpec().hasTypeSpecifier() 266 && (D.getNumTypeObjects() == 0 267 || (D.getNumTypeObjects() == 1 268 && D.getTypeObject(0).Kind == DeclaratorChunk::Function))) 269 OmittedReturnType = true; 270 271 // long long is a C99 feature. 272 if (!getLangOptions().C99 && !getLangOptions().CPlusPlus0x && 273 D.getDeclSpec().getTypeSpecWidth() == DeclSpec::TSW_longlong) 274 Diag(D.getDeclSpec().getTypeSpecWidthLoc(), diag::ext_longlong); 275 276 // Determine the type of the declarator. Not all forms of declarator 277 // have a type. 278 QualType T; 279 switch (D.getKind()) { 280 case Declarator::DK_Abstract: 281 case Declarator::DK_Normal: 282 case Declarator::DK_Operator: { 283 const DeclSpec& DS = D.getDeclSpec(); 284 if (OmittedReturnType) 285 // We default to a dependent type initially. Can be modified by 286 // the first return statement. 287 T = Context.DependentTy; 288 else { 289 T = ConvertDeclSpecToType(DS); 290 if (T.isNull()) 291 return T; 292 } 293 break; 294 } 295 296 case Declarator::DK_Constructor: 297 case Declarator::DK_Destructor: 298 case Declarator::DK_Conversion: 299 // Constructors and destructors don't have return types. Use 300 // "void" instead. Conversion operators will check their return 301 // types separately. 302 T = Context.VoidTy; 303 break; 304 } 305 306 // Walk the DeclTypeInfo, building the recursive type as we go. 307 // DeclTypeInfos are ordered from the identifier out, which is 308 // opposite of what we want :). 309 for (unsigned i = Skip, e = D.getNumTypeObjects(); i != e; ++i) { 310 DeclaratorChunk &DeclType = D.getTypeObject(e-i-1+Skip); 311 switch (DeclType.Kind) { 312 default: assert(0 && "Unknown decltype!"); 313 case DeclaratorChunk::BlockPointer: 314 if (DeclType.Cls.TypeQuals) 315 Diag(D.getIdentifierLoc(), diag::err_qualified_block_pointer_type); 316 if (!T.getTypePtr()->isFunctionType()) 317 Diag(D.getIdentifierLoc(), diag::err_nonfunction_block_type); 318 else 319 T = Context.getBlockPointerType(T); 320 break; 321 case DeclaratorChunk::Pointer: 322 if (T->isReferenceType()) { 323 // C++ 8.3.2p4: There shall be no ... pointers to references ... 324 Diag(DeclType.Loc, diag::err_illegal_decl_pointer_to_reference) 325 << (D.getIdentifier() ? D.getIdentifier()->getName() : "type name"); 326 D.setInvalidType(true); 327 T = Context.IntTy; 328 } 329 330 // Enforce C99 6.7.3p2: "Types other than pointer types derived from 331 // object or incomplete types shall not be restrict-qualified." 332 if ((DeclType.Ptr.TypeQuals & QualType::Restrict) && 333 !T->isIncompleteOrObjectType()) { 334 Diag(DeclType.Loc, diag::err_typecheck_invalid_restrict_invalid_pointee) 335 << T; 336 DeclType.Ptr.TypeQuals &= ~QualType::Restrict; 337 } 338 339 // Apply the pointer typequals to the pointer object. 340 T = Context.getPointerType(T).getQualifiedType(DeclType.Ptr.TypeQuals); 341 break; 342 case DeclaratorChunk::Reference: { 343 // Whether we should suppress the creation of the reference. 344 bool SuppressReference = false; 345 if (T->isReferenceType()) { 346 // C++ [dcl.ref]p4: There shall be no references to references. 347 // 348 // According to C++ DR 106, references to references are only 349 // diagnosed when they are written directly (e.g., "int & &"), 350 // but not when they happen via a typedef: 351 // 352 // typedef int& intref; 353 // typedef intref& intref2; 354 // 355 // Parser::ParserDeclaratorInternal diagnoses the case where 356 // references are written directly; here, we handle the 357 // collapsing of references-to-references as described in C++ 358 // DR 106 and amended by C++ DR 540. 359 SuppressReference = true; 360 } 361 362 // C++ [dcl.ref]p1: 363 // A declarator that specifies the type “reference to cv void” 364 // is ill-formed. 365 if (T->isVoidType()) { 366 Diag(DeclType.Loc, diag::err_reference_to_void); 367 D.setInvalidType(true); 368 T = Context.IntTy; 369 } 370 371 // Enforce C99 6.7.3p2: "Types other than pointer types derived from 372 // object or incomplete types shall not be restrict-qualified." 373 if (DeclType.Ref.HasRestrict && 374 !T->isIncompleteOrObjectType()) { 375 Diag(DeclType.Loc, diag::err_typecheck_invalid_restrict_invalid_pointee) 376 << T; 377 DeclType.Ref.HasRestrict = false; 378 } 379 380 if (!SuppressReference) 381 T = Context.getReferenceType(T); 382 383 // Handle restrict on references. 384 if (DeclType.Ref.HasRestrict) 385 T.addRestrict(); 386 break; 387 } 388 case DeclaratorChunk::Array: { 389 DeclaratorChunk::ArrayTypeInfo &ATI = DeclType.Arr; 390 Expr *ArraySize = static_cast<Expr*>(ATI.NumElts); 391 ArrayType::ArraySizeModifier ASM; 392 if (ATI.isStar) 393 ASM = ArrayType::Star; 394 else if (ATI.hasStatic) 395 ASM = ArrayType::Static; 396 else 397 ASM = ArrayType::Normal; 398 399 // C99 6.7.5.2p1: If the element type is an incomplete or function type, 400 // reject it (e.g. void ary[7], struct foo ary[7], void ary[7]()) 401 if (DiagnoseIncompleteType(D.getIdentifierLoc(), T, 402 diag::err_illegal_decl_array_incomplete_type)) { 403 T = Context.IntTy; 404 D.setInvalidType(true); 405 } else if (T->isFunctionType()) { 406 Diag(D.getIdentifierLoc(), diag::err_illegal_decl_array_of_functions) 407 << (D.getIdentifier() ? D.getIdentifier()->getName() : "type name"); 408 T = Context.getPointerType(T); 409 D.setInvalidType(true); 410 } else if (const ReferenceType *RT = T->getAsReferenceType()) { 411 // C++ 8.3.2p4: There shall be no ... arrays of references ... 412 Diag(D.getIdentifierLoc(), diag::err_illegal_decl_array_of_references) 413 << (D.getIdentifier() ? D.getIdentifier()->getName() : "type name"); 414 T = RT->getPointeeType(); 415 D.setInvalidType(true); 416 } else if (const RecordType *EltTy = T->getAsRecordType()) { 417 // If the element type is a struct or union that contains a variadic 418 // array, accept it as a GNU extension: C99 6.7.2.1p2. 419 if (EltTy->getDecl()->hasFlexibleArrayMember()) 420 Diag(DeclType.Loc, diag::ext_flexible_array_in_array) << T; 421 } else if (T->isObjCInterfaceType()) { 422 Diag(DeclType.Loc, diag::warn_objc_array_of_interfaces) << T; 423 } 424 425 // C99 6.7.5.2p1: The size expression shall have integer type. 426 if (ArraySize && !ArraySize->getType()->isIntegerType()) { 427 Diag(ArraySize->getLocStart(), diag::err_array_size_non_int) 428 << ArraySize->getType() << ArraySize->getSourceRange(); 429 D.setInvalidType(true); 430 ArraySize->Destroy(Context); 431 ATI.NumElts = ArraySize = 0; 432 } 433 llvm::APSInt ConstVal(32); 434 if (!ArraySize) { 435 T = Context.getIncompleteArrayType(T, ASM, ATI.TypeQuals); 436 } else if (ArraySize->isValueDependent()) { 437 T = Context.getDependentSizedArrayType(T, ArraySize, ASM, ATI.TypeQuals); 438 } else if (!ArraySize->isIntegerConstantExpr(ConstVal, Context) || 439 !T->isConstantSizeType()) { 440 // Per C99, a variable array is an array with either a non-constant 441 // size or an element type that has a non-constant-size 442 T = Context.getVariableArrayType(T, ArraySize, ASM, ATI.TypeQuals); 443 } else { 444 // C99 6.7.5.2p1: If the expression is a constant expression, it shall 445 // have a value greater than zero. 446 if (ConstVal.isSigned()) { 447 if (ConstVal.isNegative()) { 448 Diag(ArraySize->getLocStart(), 449 diag::err_typecheck_negative_array_size) 450 << ArraySize->getSourceRange(); 451 D.setInvalidType(true); 452 } else if (ConstVal == 0) { 453 // GCC accepts zero sized static arrays. 454 Diag(ArraySize->getLocStart(), diag::ext_typecheck_zero_array_size) 455 << ArraySize->getSourceRange(); 456 } 457 } 458 T = Context.getConstantArrayType(T, ConstVal, ASM, ATI.TypeQuals); 459 } 460 // If this is not C99, extwarn about VLA's and C99 array size modifiers. 461 if (!getLangOptions().C99) { 462 if (ArraySize && !ArraySize->isValueDependent() && 463 !ArraySize->isIntegerConstantExpr(Context)) 464 Diag(D.getIdentifierLoc(), diag::ext_vla); 465 else if (ASM != ArrayType::Normal || ATI.TypeQuals != 0) 466 Diag(D.getIdentifierLoc(), diag::ext_c99_array_usage); 467 } 468 break; 469 } 470 case DeclaratorChunk::Function: { 471 // If the function declarator has a prototype (i.e. it is not () and 472 // does not have a K&R-style identifier list), then the arguments are part 473 // of the type, otherwise the argument list is (). 474 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun; 475 476 // C99 6.7.5.3p1: The return type may not be a function or array type. 477 if (T->isArrayType() || T->isFunctionType()) { 478 Diag(DeclType.Loc, diag::err_func_returning_array_function) << T; 479 T = Context.IntTy; 480 D.setInvalidType(true); 481 } 482 483 if (FTI.NumArgs == 0) { 484 if (getLangOptions().CPlusPlus) { 485 // C++ 8.3.5p2: If the parameter-declaration-clause is empty, the 486 // function takes no arguments. 487 T = Context.getFunctionType(T, NULL, 0, FTI.isVariadic,FTI.TypeQuals); 488 } else if (FTI.isVariadic) { 489 // We allow a zero-parameter variadic function in C if the 490 // function is marked with the "overloadable" 491 // attribute. Scan for this attribute now. 492 bool Overloadable = false; 493 for (const AttributeList *Attrs = D.getAttributes(); 494 Attrs; Attrs = Attrs->getNext()) { 495 if (Attrs->getKind() == AttributeList::AT_overloadable) { 496 Overloadable = true; 497 break; 498 } 499 } 500 501 if (!Overloadable) 502 Diag(FTI.getEllipsisLoc(), diag::err_ellipsis_first_arg); 503 T = Context.getFunctionType(T, NULL, 0, FTI.isVariadic, 0); 504 } else { 505 // Simple void foo(), where the incoming T is the result type. 506 T = Context.getFunctionTypeNoProto(T); 507 } 508 } else if (FTI.ArgInfo[0].Param == 0) { 509 // C99 6.7.5.3p3: Reject int(x,y,z) when it's not a function definition. 510 Diag(FTI.ArgInfo[0].IdentLoc, diag::err_ident_list_in_fn_declaration); 511 } else { 512 // Otherwise, we have a function with an argument list that is 513 // potentially variadic. 514 llvm::SmallVector<QualType, 16> ArgTys; 515 516 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 517 ParmVarDecl *Param = (ParmVarDecl *)FTI.ArgInfo[i].Param; 518 QualType ArgTy = Param->getType(); 519 assert(!ArgTy.isNull() && "Couldn't parse type?"); 520 // 521 // Perform the default function/array conversion (C99 6.7.5.3p[7,8]). 522 // This matches the conversion that is done in 523 // Sema::ActOnParamDeclarator(). Without this conversion, the 524 // argument type in the function prototype *will not* match the 525 // type in ParmVarDecl (which makes the code generator unhappy). 526 // 527 // FIXME: We still apparently need the conversion in 528 // Sema::ActOnParamDeclarator(). This doesn't make any sense, since 529 // it should be driving off the type being created here. 530 // 531 // FIXME: If a source translation tool needs to see the original type, 532 // then we need to consider storing both types somewhere... 533 // 534 if (ArgTy->isArrayType()) { 535 ArgTy = Context.getArrayDecayedType(ArgTy); 536 } else if (ArgTy->isFunctionType()) 537 ArgTy = Context.getPointerType(ArgTy); 538 539 // Look for 'void'. void is allowed only as a single argument to a 540 // function with no other parameters (C99 6.7.5.3p10). We record 541 // int(void) as a FunctionTypeProto with an empty argument list. 542 else if (ArgTy->isVoidType()) { 543 // If this is something like 'float(int, void)', reject it. 'void' 544 // is an incomplete type (C99 6.2.5p19) and function decls cannot 545 // have arguments of incomplete type. 546 if (FTI.NumArgs != 1 || FTI.isVariadic) { 547 Diag(DeclType.Loc, diag::err_void_only_param); 548 ArgTy = Context.IntTy; 549 Param->setType(ArgTy); 550 } else if (FTI.ArgInfo[i].Ident) { 551 // Reject, but continue to parse 'int(void abc)'. 552 Diag(FTI.ArgInfo[i].IdentLoc, 553 diag::err_param_with_void_type); 554 ArgTy = Context.IntTy; 555 Param->setType(ArgTy); 556 } else { 557 // Reject, but continue to parse 'float(const void)'. 558 if (ArgTy.getCVRQualifiers()) 559 Diag(DeclType.Loc, diag::err_void_param_qualified); 560 561 // Do not add 'void' to the ArgTys list. 562 break; 563 } 564 } else if (!FTI.hasPrototype) { 565 if (ArgTy->isPromotableIntegerType()) { 566 ArgTy = Context.IntTy; 567 } else if (const BuiltinType* BTy = ArgTy->getAsBuiltinType()) { 568 if (BTy->getKind() == BuiltinType::Float) 569 ArgTy = Context.DoubleTy; 570 } 571 } 572 573 ArgTys.push_back(ArgTy); 574 } 575 T = Context.getFunctionType(T, &ArgTys[0], ArgTys.size(), 576 FTI.isVariadic, FTI.TypeQuals); 577 } 578 break; 579 } 580 case DeclaratorChunk::MemberPointer: 581 // The scope spec must refer to a class, or be dependent. 582 DeclContext *DC = static_cast<DeclContext*>( 583 DeclType.Mem.Scope().getScopeRep()); 584 QualType ClsType; 585 // FIXME: Extend for dependent types when it's actually supported. 586 // See ActOnCXXNestedNameSpecifier. 587 if (CXXRecordDecl *RD = dyn_cast_or_null<CXXRecordDecl>(DC)) { 588 ClsType = Context.getTagDeclType(RD); 589 } else { 590 if (DC) { 591 Diag(DeclType.Mem.Scope().getBeginLoc(), 592 diag::err_illegal_decl_mempointer_in_nonclass) 593 << (D.getIdentifier() ? D.getIdentifier()->getName() : "type name") 594 << DeclType.Mem.Scope().getRange(); 595 } 596 D.setInvalidType(true); 597 ClsType = Context.IntTy; 598 } 599 600 // C++ 8.3.3p3: A pointer to member shall not pointer to ... a member 601 // with reference type, or "cv void." 602 if (T->isReferenceType()) { 603 Diag(DeclType.Loc, diag::err_illegal_decl_pointer_to_reference) 604 << (D.getIdentifier() ? D.getIdentifier()->getName() : "type name"); 605 D.setInvalidType(true); 606 T = Context.IntTy; 607 } 608 if (T->isVoidType()) { 609 Diag(DeclType.Loc, diag::err_illegal_decl_mempointer_to_void) 610 << (D.getIdentifier() ? D.getIdentifier()->getName() : "type name"); 611 T = Context.IntTy; 612 } 613 614 // Enforce C99 6.7.3p2: "Types other than pointer types derived from 615 // object or incomplete types shall not be restrict-qualified." 616 if ((DeclType.Mem.TypeQuals & QualType::Restrict) && 617 !T->isIncompleteOrObjectType()) { 618 Diag(DeclType.Loc, diag::err_typecheck_invalid_restrict_invalid_pointee) 619 << T; 620 DeclType.Mem.TypeQuals &= ~QualType::Restrict; 621 } 622 623 T = Context.getMemberPointerType(T, ClsType.getTypePtr()). 624 getQualifiedType(DeclType.Mem.TypeQuals); 625 626 break; 627 } 628 629 // See if there are any attributes on this declarator chunk. 630 if (const AttributeList *AL = DeclType.getAttrs()) 631 ProcessTypeAttributeList(T, AL); 632 } 633 634 if (getLangOptions().CPlusPlus && T->isFunctionType()) { 635 const FunctionTypeProto *FnTy = T->getAsFunctionTypeProto(); 636 assert(FnTy && "Why oh why is there not a FunctionTypeProto here ?"); 637 638 // C++ 8.3.5p4: A cv-qualifier-seq shall only be part of the function type 639 // for a nonstatic member function, the function type to which a pointer 640 // to member refers, or the top-level function type of a function typedef 641 // declaration. 642 if (FnTy->getTypeQuals() != 0 && 643 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 644 ((D.getContext() != Declarator::MemberContext && 645 (!D.getCXXScopeSpec().isSet() || 646 !static_cast<DeclContext*>(D.getCXXScopeSpec().getScopeRep()) 647 ->isRecord())) || 648 D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_static)) { 649 if (D.isFunctionDeclarator()) 650 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_function_type); 651 else 652 Diag(D.getIdentifierLoc(), 653 diag::err_invalid_qualified_typedef_function_type_use); 654 655 // Strip the cv-quals from the type. 656 T = Context.getFunctionType(FnTy->getResultType(), FnTy->arg_type_begin(), 657 FnTy->getNumArgs(), FnTy->isVariadic(), 0); 658 } 659 } 660 661 // If there were any type attributes applied to the decl itself (not the 662 // type, apply the type attribute to the type!) 663 if (const AttributeList *Attrs = D.getAttributes()) 664 ProcessTypeAttributeList(T, Attrs); 665 666 return T; 667} 668 669/// ObjCGetTypeForMethodDefinition - Builds the type for a method definition 670/// declarator 671QualType Sema::ObjCGetTypeForMethodDefinition(DeclTy *D) { 672 ObjCMethodDecl *MDecl = cast<ObjCMethodDecl>(static_cast<Decl *>(D)); 673 QualType T = MDecl->getResultType(); 674 llvm::SmallVector<QualType, 16> ArgTys; 675 676 // Add the first two invisible argument types for self and _cmd. 677 if (MDecl->isInstanceMethod()) { 678 QualType selfTy = Context.getObjCInterfaceType(MDecl->getClassInterface()); 679 selfTy = Context.getPointerType(selfTy); 680 ArgTys.push_back(selfTy); 681 } else 682 ArgTys.push_back(Context.getObjCIdType()); 683 ArgTys.push_back(Context.getObjCSelType()); 684 685 for (ObjCMethodDecl::param_iterator PI = MDecl->param_begin(), 686 E = MDecl->param_end(); PI != E; ++PI) { 687 QualType ArgTy = (*PI)->getType(); 688 assert(!ArgTy.isNull() && "Couldn't parse type?"); 689 // Perform the default function/array conversion (C99 6.7.5.3p[7,8]). 690 // This matches the conversion that is done in 691 // Sema::ActOnParamDeclarator(). 692 if (ArgTy->isArrayType()) 693 ArgTy = Context.getArrayDecayedType(ArgTy); 694 else if (ArgTy->isFunctionType()) 695 ArgTy = Context.getPointerType(ArgTy); 696 ArgTys.push_back(ArgTy); 697 } 698 T = Context.getFunctionType(T, &ArgTys[0], ArgTys.size(), 699 MDecl->isVariadic(), 0); 700 return T; 701} 702 703/// UnwrapSimilarPointerTypes - If T1 and T2 are pointer types that 704/// may be similar (C++ 4.4), replaces T1 and T2 with the type that 705/// they point to and return true. If T1 and T2 aren't pointer types 706/// or pointer-to-member types, or if they are not similar at this 707/// level, returns false and leaves T1 and T2 unchanged. Top-level 708/// qualifiers on T1 and T2 are ignored. This function will typically 709/// be called in a loop that successively "unwraps" pointer and 710/// pointer-to-member types to compare them at each level. 711bool Sema::UnwrapSimilarPointerTypes(QualType& T1, QualType& T2) { 712 const PointerType *T1PtrType = T1->getAsPointerType(), 713 *T2PtrType = T2->getAsPointerType(); 714 if (T1PtrType && T2PtrType) { 715 T1 = T1PtrType->getPointeeType(); 716 T2 = T2PtrType->getPointeeType(); 717 return true; 718 } 719 720 const MemberPointerType *T1MPType = T1->getAsMemberPointerType(), 721 *T2MPType = T2->getAsMemberPointerType(); 722 if (T1MPType && T2MPType && 723 Context.getCanonicalType(T1MPType->getClass()) == 724 Context.getCanonicalType(T2MPType->getClass())) { 725 T1 = T1MPType->getPointeeType(); 726 T2 = T2MPType->getPointeeType(); 727 return true; 728 } 729 return false; 730} 731 732Sema::TypeResult Sema::ActOnTypeName(Scope *S, Declarator &D) { 733 // C99 6.7.6: Type names have no identifier. This is already validated by 734 // the parser. 735 assert(D.getIdentifier() == 0 && "Type name should have no identifier!"); 736 737 QualType T = GetTypeForDeclarator(D, S); 738 if (T.isNull()) 739 return true; 740 741 // Check that there are no default arguments (C++ only). 742 if (getLangOptions().CPlusPlus) 743 CheckExtraCXXDefaultArguments(D); 744 745 return T.getAsOpaquePtr(); 746} 747 748 749 750//===----------------------------------------------------------------------===// 751// Type Attribute Processing 752//===----------------------------------------------------------------------===// 753 754/// HandleAddressSpaceTypeAttribute - Process an address_space attribute on the 755/// specified type. The attribute contains 1 argument, the id of the address 756/// space for the type. 757static void HandleAddressSpaceTypeAttribute(QualType &Type, 758 const AttributeList &Attr, Sema &S){ 759 // If this type is already address space qualified, reject it. 760 // Clause 6.7.3 - Type qualifiers: "No type shall be qualified by qualifiers 761 // for two or more different address spaces." 762 if (Type.getAddressSpace()) { 763 S.Diag(Attr.getLoc(), diag::err_attribute_address_multiple_qualifiers); 764 return; 765 } 766 767 // Check the attribute arguments. 768 if (Attr.getNumArgs() != 1) { 769 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 770 return; 771 } 772 Expr *ASArgExpr = static_cast<Expr *>(Attr.getArg(0)); 773 llvm::APSInt addrSpace(32); 774 if (!ASArgExpr->isIntegerConstantExpr(addrSpace, S.Context)) { 775 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_not_int) 776 << ASArgExpr->getSourceRange(); 777 return; 778 } 779 780 unsigned ASIdx = static_cast<unsigned>(addrSpace.getZExtValue()); 781 Type = S.Context.getAddrSpaceQualType(Type, ASIdx); 782} 783 784/// HandleObjCGCTypeAttribute - Process an objc's gc attribute on the 785/// specified type. The attribute contains 1 argument, weak or strong. 786static void HandleObjCGCTypeAttribute(QualType &Type, 787 const AttributeList &Attr, Sema &S) { 788 if (Type.getObjCGCAttr() != QualType::GCNone) { 789 S.Diag(Attr.getLoc(), diag::err_attribute_multiple_objc_gc); 790 return; 791 } 792 793 // Check the attribute arguments. 794 if (!Attr.getParameterName()) { 795 S.Diag(Attr.getLoc(), diag::err_attribute_argument_n_not_string) 796 << "objc_gc" << 1; 797 return; 798 } 799 QualType::GCAttrTypes GCAttr; 800 if (Attr.getNumArgs() != 0) { 801 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 802 return; 803 } 804 if (Attr.getParameterName()->isStr("weak")) 805 GCAttr = QualType::Weak; 806 else if (Attr.getParameterName()->isStr("strong")) 807 GCAttr = QualType::Strong; 808 else { 809 S.Diag(Attr.getLoc(), diag::warn_attribute_type_not_supported) 810 << "objc_gc" << Attr.getParameterName(); 811 return; 812 } 813 814 Type = S.Context.getObjCGCQualType(Type, GCAttr); 815} 816 817void Sema::ProcessTypeAttributeList(QualType &Result, const AttributeList *AL) { 818 // Scan through and apply attributes to this type where it makes sense. Some 819 // attributes (such as __address_space__, __vector_size__, etc) apply to the 820 // type, but others can be present in the type specifiers even though they 821 // apply to the decl. Here we apply type attributes and ignore the rest. 822 for (; AL; AL = AL->getNext()) { 823 // If this is an attribute we can handle, do so now, otherwise, add it to 824 // the LeftOverAttrs list for rechaining. 825 switch (AL->getKind()) { 826 default: break; 827 case AttributeList::AT_address_space: 828 HandleAddressSpaceTypeAttribute(Result, *AL, *this); 829 break; 830 case AttributeList::AT_objc_gc: 831 HandleObjCGCTypeAttribute(Result, *AL, *this); 832 break; 833 } 834 } 835} 836 837/// @brief If the type T is incomplete and cannot be completed, 838/// produce a suitable diagnostic. 839/// 840/// This routine checks whether the type @p T is complete in any 841/// context where a complete type is required. If @p T is a complete 842/// type, returns false. If @p T is incomplete, issues the diagnostic 843/// @p diag (giving it the type @p T) and returns true. 844/// 845/// @param Loc The location in the source that the incomplete type 846/// diagnostic should refer to. 847/// 848/// @param T The type that this routine is examining for completeness. 849/// 850/// @param diag The diagnostic value (e.g., 851/// @c diag::err_typecheck_decl_incomplete_type) that will be used 852/// for the error message if @p T is incomplete. 853/// 854/// @param Range1 An optional range in the source code that will be a 855/// part of the "incomplete type" error message. 856/// 857/// @param Range2 An optional range in the source code that will be a 858/// part of the "incomplete type" error message. 859/// 860/// @param PrintType If non-NULL, the type that should be printed 861/// instead of @p T. This parameter should be used when the type that 862/// we're checking for incompleteness isn't the type that should be 863/// displayed to the user, e.g., when T is a type and PrintType is a 864/// pointer to T. 865/// 866/// @returns @c true if @p T is incomplete and a diagnostic was emitted, 867/// @c false otherwise. 868/// 869/// @todo When Clang gets proper support for C++ templates, this 870/// routine will also be able perform template instantiation when @p T 871/// is a class template specialization. 872bool Sema::DiagnoseIncompleteType(SourceLocation Loc, QualType T, unsigned diag, 873 SourceRange Range1, SourceRange Range2, 874 QualType PrintType) { 875 // If we have a complete type, we're done. 876 if (!T->isIncompleteType()) 877 return false; 878 879 if (PrintType.isNull()) 880 PrintType = T; 881 882 // We have an incomplete type. Produce a diagnostic. 883 Diag(Loc, diag) << PrintType << Range1 << Range2; 884 885 // If the type was a forward declaration of a class/struct/union 886 // type, produce 887 const TagType *Tag = 0; 888 if (const RecordType *Record = T->getAsRecordType()) 889 Tag = Record; 890 else if (const EnumType *Enum = T->getAsEnumType()) 891 Tag = Enum; 892 893 if (Tag && !Tag->getDecl()->isInvalidDecl()) 894 Diag(Tag->getDecl()->getLocation(), 895 Tag->isBeingDefined() ? diag::note_type_being_defined 896 : diag::note_forward_declaration) 897 << QualType(Tag, 0); 898 899 return true; 900} 901