SemaType.cpp revision ae17c7aa7f431e4c797133f272d47bbd027a957d
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 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 if (!DS.hasTypeSpecifier()) { 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 // FIXME: Does Microsoft really have the implicit int extension in C++? 88 unsigned DK = getLangOptions().CPlusPlus && !getLangOptions().Microsoft? 89 diag::err_missing_type_specifier 90 : diag::ext_missing_type_specifier; 91 Diag(DS.getSourceRange().getBegin(), DK); 92 } 93 94 // FALL THROUGH. 95 case DeclSpec::TST_int: { 96 if (DS.getTypeSpecSign() != DeclSpec::TSS_unsigned) { 97 switch (DS.getTypeSpecWidth()) { 98 case DeclSpec::TSW_unspecified: Result = Context.IntTy; break; 99 case DeclSpec::TSW_short: Result = Context.ShortTy; break; 100 case DeclSpec::TSW_long: Result = Context.LongTy; break; 101 case DeclSpec::TSW_longlong: Result = Context.LongLongTy; break; 102 } 103 } else { 104 switch (DS.getTypeSpecWidth()) { 105 case DeclSpec::TSW_unspecified: Result = Context.UnsignedIntTy; break; 106 case DeclSpec::TSW_short: Result = Context.UnsignedShortTy; break; 107 case DeclSpec::TSW_long: Result = Context.UnsignedLongTy; break; 108 case DeclSpec::TSW_longlong: Result =Context.UnsignedLongLongTy; break; 109 } 110 } 111 break; 112 } 113 case DeclSpec::TST_float: Result = Context.FloatTy; break; 114 case DeclSpec::TST_double: 115 if (DS.getTypeSpecWidth() == DeclSpec::TSW_long) 116 Result = Context.LongDoubleTy; 117 else 118 Result = Context.DoubleTy; 119 break; 120 case DeclSpec::TST_bool: Result = Context.BoolTy; break; // _Bool or bool 121 case DeclSpec::TST_decimal32: // _Decimal32 122 case DeclSpec::TST_decimal64: // _Decimal64 123 case DeclSpec::TST_decimal128: // _Decimal128 124 assert(0 && "FIXME: GNU decimal extensions not supported yet!"); 125 case DeclSpec::TST_class: 126 case DeclSpec::TST_enum: 127 case DeclSpec::TST_union: 128 case DeclSpec::TST_struct: { 129 Decl *D = static_cast<Decl *>(DS.getTypeRep()); 130 assert(D && "Didn't get a decl for a class/enum/union/struct?"); 131 assert(DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 && 132 DS.getTypeSpecSign() == 0 && 133 "Can't handle qualifiers on typedef names yet!"); 134 // TypeQuals handled by caller. 135 Result = Context.getTypeDeclType(cast<TypeDecl>(D)); 136 break; 137 } 138 case DeclSpec::TST_typename: { 139 assert(DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 && 140 DS.getTypeSpecSign() == 0 && 141 "Can't handle qualifiers on typedef names yet!"); 142 Result = QualType::getFromOpaquePtr(DS.getTypeRep()); 143 144 if (DeclSpec::ProtocolQualifierListTy PQ = DS.getProtocolQualifiers()) { 145 // FIXME: Adding a TST_objcInterface clause doesn't seem ideal, so 146 // we have this "hack" for now... 147 if (const ObjCInterfaceType *Interface = Result->getAsObjCInterfaceType()) 148 Result = Context.getObjCQualifiedInterfaceType(Interface->getDecl(), 149 (ObjCProtocolDecl**)PQ, 150 DS.getNumProtocolQualifiers()); 151 else if (Result == Context.getObjCIdType()) 152 // id<protocol-list> 153 Result = Context.getObjCQualifiedIdType((ObjCProtocolDecl**)PQ, 154 DS.getNumProtocolQualifiers()); 155 } 156 // TypeQuals handled by caller. 157 break; 158 } 159 case DeclSpec::TST_typeofType: 160 Result = QualType::getFromOpaquePtr(DS.getTypeRep()); 161 assert(!Result.isNull() && "Didn't get a type for typeof?"); 162 // TypeQuals handled by caller. 163 Result = Context.getTypeOfType(Result); 164 break; 165 case DeclSpec::TST_typeofExpr: { 166 Expr *E = static_cast<Expr *>(DS.getTypeRep()); 167 assert(E && "Didn't get an expression for typeof?"); 168 // TypeQuals handled by caller. 169 Result = Context.getTypeOfExpr(E); 170 break; 171 } 172 } 173 174 // Handle complex types. 175 if (DS.getTypeSpecComplex() == DeclSpec::TSC_complex) { 176 if (getLangOptions().Freestanding) 177 Diag(DS.getTypeSpecComplexLoc(), diag::ext_freestanding_complex); 178 Result = Context.getComplexType(Result); 179 } 180 181 assert(DS.getTypeSpecComplex() != DeclSpec::TSC_imaginary && 182 "FIXME: imaginary types not supported yet!"); 183 184 // See if there are any attributes on the declspec that apply to the type (as 185 // opposed to the decl). 186 if (const AttributeList *AL = DS.getAttributes()) 187 ProcessTypeAttributeList(Result, AL); 188 189 // Apply const/volatile/restrict qualifiers to T. 190 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 191 192 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 193 // or incomplete types shall not be restrict-qualified." C++ also allows 194 // restrict-qualified references. 195 if (TypeQuals & QualType::Restrict) { 196 if (const PointerLikeType *PT = Result->getAsPointerLikeType()) { 197 QualType EltTy = PT->getPointeeType(); 198 199 // If we have a pointer or reference, the pointee must have an object or 200 // incomplete type. 201 if (!EltTy->isIncompleteOrObjectType()) { 202 Diag(DS.getRestrictSpecLoc(), 203 diag::err_typecheck_invalid_restrict_invalid_pointee) 204 << EltTy << DS.getSourceRange(); 205 TypeQuals &= ~QualType::Restrict; // Remove the restrict qualifier. 206 } 207 } else { 208 Diag(DS.getRestrictSpecLoc(), 209 diag::err_typecheck_invalid_restrict_not_pointer) 210 << Result << DS.getSourceRange(); 211 TypeQuals &= ~QualType::Restrict; // Remove the restrict qualifier. 212 } 213 } 214 215 // Warn about CV qualifiers on functions: C99 6.7.3p8: "If the specification 216 // of a function type includes any type qualifiers, the behavior is 217 // undefined." 218 if (Result->isFunctionType() && TypeQuals) { 219 // Get some location to point at, either the C or V location. 220 SourceLocation Loc; 221 if (TypeQuals & QualType::Const) 222 Loc = DS.getConstSpecLoc(); 223 else { 224 assert((TypeQuals & QualType::Volatile) && 225 "Has CV quals but not C or V?"); 226 Loc = DS.getVolatileSpecLoc(); 227 } 228 Diag(Loc, diag::warn_typecheck_function_qualifiers) 229 << Result << DS.getSourceRange(); 230 } 231 232 // C++ [dcl.ref]p1: 233 // Cv-qualified references are ill-formed except when the 234 // cv-qualifiers are introduced through the use of a typedef 235 // (7.1.3) or of a template type argument (14.3), in which 236 // case the cv-qualifiers are ignored. 237 // FIXME: Shouldn't we be checking SCS_typedef here? 238 if (DS.getTypeSpecType() == DeclSpec::TST_typename && 239 TypeQuals && Result->isReferenceType()) { 240 TypeQuals &= ~QualType::Const; 241 TypeQuals &= ~QualType::Volatile; 242 } 243 244 Result = Result.getQualifiedType(TypeQuals); 245 } 246 return Result; 247} 248 249/// GetTypeForDeclarator - Convert the type for the specified 250/// declarator to Type instances. Skip the outermost Skip type 251/// objects. 252QualType Sema::GetTypeForDeclarator(Declarator &D, Scope *S, unsigned Skip) { 253 bool OmittedReturnType = false; 254 255 if (D.getContext() == Declarator::BlockLiteralContext 256 && Skip == 0 257 && !D.getDeclSpec().hasTypeSpecifier() 258 && (D.getNumTypeObjects() == 0 259 || (D.getNumTypeObjects() == 1 260 && D.getTypeObject(0).Kind == DeclaratorChunk::Function))) 261 OmittedReturnType = true; 262 263 // long long is a C99 feature. 264 if (!getLangOptions().C99 && !getLangOptions().CPlusPlus0x && 265 D.getDeclSpec().getTypeSpecWidth() == DeclSpec::TSW_longlong) 266 Diag(D.getDeclSpec().getTypeSpecWidthLoc(), diag::ext_longlong); 267 268 // Determine the type of the declarator. Not all forms of declarator 269 // have a type. 270 QualType T; 271 switch (D.getKind()) { 272 case Declarator::DK_Abstract: 273 case Declarator::DK_Normal: 274 case Declarator::DK_Operator: { 275 const DeclSpec& DS = D.getDeclSpec(); 276 if (OmittedReturnType) 277 // We default to a dependent type initially. Can be modified by 278 // the first return statement. 279 T = Context.DependentTy; 280 else 281 T = ConvertDeclSpecToType(DS); 282 break; 283 } 284 285 case Declarator::DK_Constructor: 286 case Declarator::DK_Destructor: 287 case Declarator::DK_Conversion: 288 // Constructors and destructors don't have return types. Use 289 // "void" instead. Conversion operators will check their return 290 // types separately. 291 T = Context.VoidTy; 292 break; 293 } 294 295 // Walk the DeclTypeInfo, building the recursive type as we go. 296 // DeclTypeInfos are ordered from the identifier out, which is 297 // opposite of what we want :). 298 for (unsigned i = Skip, e = D.getNumTypeObjects(); i != e; ++i) { 299 DeclaratorChunk &DeclType = D.getTypeObject(e-i-1+Skip); 300 switch (DeclType.Kind) { 301 default: assert(0 && "Unknown decltype!"); 302 case DeclaratorChunk::BlockPointer: 303 if (DeclType.Cls.TypeQuals) 304 Diag(D.getIdentifierLoc(), diag::err_qualified_block_pointer_type); 305 if (!T.getTypePtr()->isFunctionType()) 306 Diag(D.getIdentifierLoc(), diag::err_nonfunction_block_type); 307 else 308 T = Context.getBlockPointerType(T); 309 break; 310 case DeclaratorChunk::Pointer: 311 if (T->isReferenceType()) { 312 // C++ 8.3.2p4: There shall be no ... pointers to references ... 313 Diag(DeclType.Loc, diag::err_illegal_decl_pointer_to_reference) 314 << (D.getIdentifier() ? D.getIdentifier()->getName() : "type name"); 315 D.setInvalidType(true); 316 T = Context.IntTy; 317 } 318 319 // Enforce C99 6.7.3p2: "Types other than pointer types derived from 320 // object or incomplete types shall not be restrict-qualified." 321 if ((DeclType.Ptr.TypeQuals & QualType::Restrict) && 322 !T->isIncompleteOrObjectType()) { 323 Diag(DeclType.Loc, diag::err_typecheck_invalid_restrict_invalid_pointee) 324 << T; 325 DeclType.Ptr.TypeQuals &= ~QualType::Restrict; 326 } 327 328 // Apply the pointer typequals to the pointer object. 329 T = Context.getPointerType(T).getQualifiedType(DeclType.Ptr.TypeQuals); 330 break; 331 case DeclaratorChunk::Reference: { 332 // Whether we should suppress the creation of the reference. 333 bool SuppressReference = false; 334 if (T->isReferenceType()) { 335 // C++ [dcl.ref]p4: There shall be no references to references. 336 // 337 // According to C++ DR 106, references to references are only 338 // diagnosed when they are written directly (e.g., "int & &"), 339 // but not when they happen via a typedef: 340 // 341 // typedef int& intref; 342 // typedef intref& intref2; 343 // 344 // Parser::ParserDeclaratorInternal diagnoses the case where 345 // references are written directly; here, we handle the 346 // collapsing of references-to-references as described in C++ 347 // DR 106 and amended by C++ DR 540. 348 SuppressReference = true; 349 } 350 351 // C++ [dcl.ref]p1: 352 // A declarator that specifies the type “reference to cv void” 353 // is ill-formed. 354 if (T->isVoidType()) { 355 Diag(DeclType.Loc, diag::err_reference_to_void); 356 D.setInvalidType(true); 357 T = Context.IntTy; 358 } 359 360 // Enforce C99 6.7.3p2: "Types other than pointer types derived from 361 // object or incomplete types shall not be restrict-qualified." 362 if (DeclType.Ref.HasRestrict && 363 !T->isIncompleteOrObjectType()) { 364 Diag(DeclType.Loc, diag::err_typecheck_invalid_restrict_invalid_pointee) 365 << T; 366 DeclType.Ref.HasRestrict = false; 367 } 368 369 if (!SuppressReference) 370 T = Context.getReferenceType(T); 371 372 // Handle restrict on references. 373 if (DeclType.Ref.HasRestrict) 374 T.addRestrict(); 375 break; 376 } 377 case DeclaratorChunk::Array: { 378 DeclaratorChunk::ArrayTypeInfo &ATI = DeclType.Arr; 379 Expr *ArraySize = static_cast<Expr*>(ATI.NumElts); 380 ArrayType::ArraySizeModifier ASM; 381 if (ATI.isStar) 382 ASM = ArrayType::Star; 383 else if (ATI.hasStatic) 384 ASM = ArrayType::Static; 385 else 386 ASM = ArrayType::Normal; 387 388 // C99 6.7.5.2p1: If the element type is an incomplete or function type, 389 // reject it (e.g. void ary[7], struct foo ary[7], void ary[7]()) 390 if (DiagnoseIncompleteType(D.getIdentifierLoc(), T, 391 diag::err_illegal_decl_array_incomplete_type)) { 392 T = Context.IntTy; 393 D.setInvalidType(true); 394 } else if (T->isFunctionType()) { 395 Diag(D.getIdentifierLoc(), diag::err_illegal_decl_array_of_functions) 396 << (D.getIdentifier() ? D.getIdentifier()->getName() : "type name"); 397 T = Context.getPointerType(T); 398 D.setInvalidType(true); 399 } else if (const ReferenceType *RT = T->getAsReferenceType()) { 400 // C++ 8.3.2p4: There shall be no ... arrays of references ... 401 Diag(D.getIdentifierLoc(), diag::err_illegal_decl_array_of_references) 402 << (D.getIdentifier() ? D.getIdentifier()->getName() : "type name"); 403 T = RT->getPointeeType(); 404 D.setInvalidType(true); 405 } else if (const RecordType *EltTy = T->getAsRecordType()) { 406 // If the element type is a struct or union that contains a variadic 407 // array, accept it as a GNU extension: C99 6.7.2.1p2. 408 if (EltTy->getDecl()->hasFlexibleArrayMember()) 409 Diag(DeclType.Loc, diag::ext_flexible_array_in_array) << T; 410 } else if (T->isObjCInterfaceType()) { 411 Diag(DeclType.Loc, diag::warn_objc_array_of_interfaces) << T; 412 } 413 414 // C99 6.7.5.2p1: The size expression shall have integer type. 415 if (ArraySize && !ArraySize->getType()->isIntegerType()) { 416 Diag(ArraySize->getLocStart(), diag::err_array_size_non_int) 417 << ArraySize->getType() << ArraySize->getSourceRange(); 418 D.setInvalidType(true); 419 ArraySize->Destroy(Context); 420 ATI.NumElts = ArraySize = 0; 421 } 422 llvm::APSInt ConstVal(32); 423 if (!ArraySize) { 424 T = Context.getIncompleteArrayType(T, ASM, ATI.TypeQuals); 425 } else if (ArraySize->isValueDependent()) { 426 T = Context.getDependentSizedArrayType(T, ArraySize, ASM, ATI.TypeQuals); 427 } else if (!ArraySize->isIntegerConstantExpr(ConstVal, Context) || 428 !T->isConstantSizeType()) { 429 // Per C99, a variable array is an array with either a non-constant 430 // size or an element type that has a non-constant-size 431 T = Context.getVariableArrayType(T, ArraySize, ASM, ATI.TypeQuals); 432 } else { 433 // C99 6.7.5.2p1: If the expression is a constant expression, it shall 434 // have a value greater than zero. 435 if (ConstVal.isSigned()) { 436 if (ConstVal.isNegative()) { 437 Diag(ArraySize->getLocStart(), 438 diag::err_typecheck_negative_array_size) 439 << ArraySize->getSourceRange(); 440 D.setInvalidType(true); 441 } else if (ConstVal == 0) { 442 // GCC accepts zero sized static arrays. 443 Diag(ArraySize->getLocStart(), diag::ext_typecheck_zero_array_size) 444 << ArraySize->getSourceRange(); 445 } 446 } 447 T = Context.getConstantArrayType(T, ConstVal, ASM, ATI.TypeQuals); 448 } 449 // If this is not C99, extwarn about VLA's and C99 array size modifiers. 450 if (!getLangOptions().C99) { 451 if (ArraySize && !ArraySize->isValueDependent() && 452 !ArraySize->isIntegerConstantExpr(Context)) 453 Diag(D.getIdentifierLoc(), diag::ext_vla); 454 else if (ASM != ArrayType::Normal || ATI.TypeQuals != 0) 455 Diag(D.getIdentifierLoc(), diag::ext_c99_array_usage); 456 } 457 break; 458 } 459 case DeclaratorChunk::Function: { 460 // If the function declarator has a prototype (i.e. it is not () and 461 // does not have a K&R-style identifier list), then the arguments are part 462 // of the type, otherwise the argument list is (). 463 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun; 464 465 // C99 6.7.5.3p1: The return type may not be a function or array type. 466 if (T->isArrayType() || T->isFunctionType()) { 467 Diag(DeclType.Loc, diag::err_func_returning_array_function) << T; 468 T = Context.IntTy; 469 D.setInvalidType(true); 470 } 471 472 if (FTI.NumArgs == 0) { 473 if (getLangOptions().CPlusPlus) { 474 // C++ 8.3.5p2: If the parameter-declaration-clause is empty, the 475 // function takes no arguments. 476 T = Context.getFunctionType(T, NULL, 0, FTI.isVariadic,FTI.TypeQuals); 477 } else { 478 // Simple void foo(), where the incoming T is the result type. 479 T = Context.getFunctionTypeNoProto(T); 480 } 481 } else if (FTI.ArgInfo[0].Param == 0) { 482 // C99 6.7.5.3p3: Reject int(x,y,z) when it's not a function definition. 483 Diag(FTI.ArgInfo[0].IdentLoc, diag::err_ident_list_in_fn_declaration); 484 } else { 485 // Otherwise, we have a function with an argument list that is 486 // potentially variadic. 487 llvm::SmallVector<QualType, 16> ArgTys; 488 489 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 490 ParmVarDecl *Param = (ParmVarDecl *)FTI.ArgInfo[i].Param; 491 QualType ArgTy = Param->getType(); 492 assert(!ArgTy.isNull() && "Couldn't parse type?"); 493 // 494 // Perform the default function/array conversion (C99 6.7.5.3p[7,8]). 495 // This matches the conversion that is done in 496 // Sema::ActOnParamDeclarator(). Without this conversion, the 497 // argument type in the function prototype *will not* match the 498 // type in ParmVarDecl (which makes the code generator unhappy). 499 // 500 // FIXME: We still apparently need the conversion in 501 // Sema::ActOnParamDeclarator(). This doesn't make any sense, since 502 // it should be driving off the type being created here. 503 // 504 // FIXME: If a source translation tool needs to see the original type, 505 // then we need to consider storing both types somewhere... 506 // 507 if (ArgTy->isArrayType()) { 508 ArgTy = Context.getArrayDecayedType(ArgTy); 509 } else if (ArgTy->isFunctionType()) 510 ArgTy = Context.getPointerType(ArgTy); 511 512 // Look for 'void'. void is allowed only as a single argument to a 513 // function with no other parameters (C99 6.7.5.3p10). We record 514 // int(void) as a FunctionTypeProto with an empty argument list. 515 else if (ArgTy->isVoidType()) { 516 // If this is something like 'float(int, void)', reject it. 'void' 517 // is an incomplete type (C99 6.2.5p19) and function decls cannot 518 // have arguments of incomplete type. 519 if (FTI.NumArgs != 1 || FTI.isVariadic) { 520 Diag(DeclType.Loc, diag::err_void_only_param); 521 ArgTy = Context.IntTy; 522 Param->setType(ArgTy); 523 } else if (FTI.ArgInfo[i].Ident) { 524 // Reject, but continue to parse 'int(void abc)'. 525 Diag(FTI.ArgInfo[i].IdentLoc, 526 diag::err_param_with_void_type); 527 ArgTy = Context.IntTy; 528 Param->setType(ArgTy); 529 } else { 530 // Reject, but continue to parse 'float(const void)'. 531 if (ArgTy.getCVRQualifiers()) 532 Diag(DeclType.Loc, diag::err_void_param_qualified); 533 534 // Do not add 'void' to the ArgTys list. 535 break; 536 } 537 } else if (!FTI.hasPrototype) { 538 if (ArgTy->isPromotableIntegerType()) { 539 ArgTy = Context.IntTy; 540 } else if (const BuiltinType* BTy = ArgTy->getAsBuiltinType()) { 541 if (BTy->getKind() == BuiltinType::Float) 542 ArgTy = Context.DoubleTy; 543 } 544 } 545 546 ArgTys.push_back(ArgTy); 547 } 548 T = Context.getFunctionType(T, &ArgTys[0], ArgTys.size(), 549 FTI.isVariadic, FTI.TypeQuals); 550 } 551 break; 552 } 553 case DeclaratorChunk::MemberPointer: 554 // The scope spec must refer to a class, or be dependent. 555 DeclContext *DC = static_cast<DeclContext*>( 556 DeclType.Mem.Scope().getScopeRep()); 557 QualType ClsType; 558 // FIXME: Extend for dependent types when it's actually supported. 559 // See ActOnCXXNestedNameSpecifier. 560 if (CXXRecordDecl *RD = dyn_cast_or_null<CXXRecordDecl>(DC)) { 561 ClsType = Context.getTagDeclType(RD); 562 } else { 563 if (DC) { 564 Diag(DeclType.Mem.Scope().getBeginLoc(), 565 diag::err_illegal_decl_mempointer_in_nonclass) 566 << (D.getIdentifier() ? D.getIdentifier()->getName() : "type name") 567 << DeclType.Mem.Scope().getRange(); 568 } 569 D.setInvalidType(true); 570 ClsType = Context.IntTy; 571 } 572 573 // C++ 8.3.3p3: A pointer to member shall not pointer to ... a member 574 // with reference type, or "cv void." 575 if (T->isReferenceType()) { 576 Diag(DeclType.Loc, diag::err_illegal_decl_pointer_to_reference) 577 << (D.getIdentifier() ? D.getIdentifier()->getName() : "type name"); 578 D.setInvalidType(true); 579 T = Context.IntTy; 580 } 581 if (T->isVoidType()) { 582 Diag(DeclType.Loc, diag::err_illegal_decl_mempointer_to_void) 583 << (D.getIdentifier() ? D.getIdentifier()->getName() : "type name"); 584 T = Context.IntTy; 585 } 586 587 // Enforce C99 6.7.3p2: "Types other than pointer types derived from 588 // object or incomplete types shall not be restrict-qualified." 589 if ((DeclType.Mem.TypeQuals & QualType::Restrict) && 590 !T->isIncompleteOrObjectType()) { 591 Diag(DeclType.Loc, diag::err_typecheck_invalid_restrict_invalid_pointee) 592 << T; 593 DeclType.Mem.TypeQuals &= ~QualType::Restrict; 594 } 595 596 T = Context.getMemberPointerType(T, ClsType.getTypePtr()). 597 getQualifiedType(DeclType.Mem.TypeQuals); 598 599 break; 600 } 601 602 // See if there are any attributes on this declarator chunk. 603 if (const AttributeList *AL = DeclType.getAttrs()) 604 ProcessTypeAttributeList(T, AL); 605 } 606 607 if (getLangOptions().CPlusPlus && T->isFunctionType()) { 608 const FunctionTypeProto *FnTy = T->getAsFunctionTypeProto(); 609 assert(FnTy && "Why oh why is there not a FunctionTypeProto here ?"); 610 611 // C++ 8.3.5p4: A cv-qualifier-seq shall only be part of the function type 612 // for a nonstatic member function, the function type to which a pointer 613 // to member refers, or the top-level function type of a function typedef 614 // declaration. 615 if (FnTy->getTypeQuals() != 0 && 616 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 617 ((D.getContext() != Declarator::MemberContext && 618 (!D.getCXXScopeSpec().isSet() || 619 !static_cast<DeclContext*>(D.getCXXScopeSpec().getScopeRep()) 620 ->isRecord())) || 621 D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_static)) { 622 if (D.isFunctionDeclarator()) 623 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_function_type); 624 else 625 Diag(D.getIdentifierLoc(), 626 diag::err_invalid_qualified_typedef_function_type_use); 627 628 // Strip the cv-quals from the type. 629 T = Context.getFunctionType(FnTy->getResultType(), FnTy->arg_type_begin(), 630 FnTy->getNumArgs(), FnTy->isVariadic(), 0); 631 } 632 } 633 634 // If there were any type attributes applied to the decl itself (not the 635 // type, apply the type attribute to the type!) 636 if (const AttributeList *Attrs = D.getAttributes()) 637 ProcessTypeAttributeList(T, Attrs); 638 639 return T; 640} 641 642/// ObjCGetTypeForMethodDefinition - Builds the type for a method definition 643/// declarator 644QualType Sema::ObjCGetTypeForMethodDefinition(DeclTy *D) { 645 ObjCMethodDecl *MDecl = dyn_cast<ObjCMethodDecl>(static_cast<Decl *>(D)); 646 QualType T = MDecl->getResultType(); 647 llvm::SmallVector<QualType, 16> ArgTys; 648 649 // Add the first two invisible argument types for self and _cmd. 650 if (MDecl->isInstanceMethod()) { 651 QualType selfTy = Context.getObjCInterfaceType(MDecl->getClassInterface()); 652 selfTy = Context.getPointerType(selfTy); 653 ArgTys.push_back(selfTy); 654 } 655 else 656 ArgTys.push_back(Context.getObjCIdType()); 657 ArgTys.push_back(Context.getObjCSelType()); 658 659 for (int i = 0, e = MDecl->getNumParams(); i != e; ++i) { 660 ParmVarDecl *PDecl = MDecl->getParamDecl(i); 661 QualType ArgTy = PDecl->getType(); 662 assert(!ArgTy.isNull() && "Couldn't parse type?"); 663 // Perform the default function/array conversion (C99 6.7.5.3p[7,8]). 664 // This matches the conversion that is done in 665 // Sema::ActOnParamDeclarator(). 666 if (ArgTy->isArrayType()) 667 ArgTy = Context.getArrayDecayedType(ArgTy); 668 else if (ArgTy->isFunctionType()) 669 ArgTy = Context.getPointerType(ArgTy); 670 ArgTys.push_back(ArgTy); 671 } 672 T = Context.getFunctionType(T, &ArgTys[0], ArgTys.size(), 673 MDecl->isVariadic(), 0); 674 return T; 675} 676 677/// UnwrapSimilarPointerTypes - If T1 and T2 are pointer types that 678/// may be similar (C++ 4.4), replaces T1 and T2 with the type that 679/// they point to and return true. If T1 and T2 aren't pointer types 680/// or pointer-to-member types, or if they are not similar at this 681/// level, returns false and leaves T1 and T2 unchanged. Top-level 682/// qualifiers on T1 and T2 are ignored. This function will typically 683/// be called in a loop that successively "unwraps" pointer and 684/// pointer-to-member types to compare them at each level. 685bool Sema::UnwrapSimilarPointerTypes(QualType& T1, QualType& T2) { 686 const PointerType *T1PtrType = T1->getAsPointerType(), 687 *T2PtrType = T2->getAsPointerType(); 688 if (T1PtrType && T2PtrType) { 689 T1 = T1PtrType->getPointeeType(); 690 T2 = T2PtrType->getPointeeType(); 691 return true; 692 } 693 694 const MemberPointerType *T1MPType = T1->getAsMemberPointerType(), 695 *T2MPType = T2->getAsMemberPointerType(); 696 if (T1MPType && T2MPType && 697 Context.getCanonicalType(T1MPType->getClass()) == 698 Context.getCanonicalType(T2MPType->getClass())) { 699 T1 = T1MPType->getPointeeType(); 700 T2 = T2MPType->getPointeeType(); 701 return true; 702 } 703 return false; 704} 705 706Sema::TypeResult Sema::ActOnTypeName(Scope *S, Declarator &D) { 707 // C99 6.7.6: Type names have no identifier. This is already validated by 708 // the parser. 709 assert(D.getIdentifier() == 0 && "Type name should have no identifier!"); 710 711 QualType T = GetTypeForDeclarator(D, S); 712 713 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 714 715 // Check that there are no default arguments (C++ only). 716 if (getLangOptions().CPlusPlus) 717 CheckExtraCXXDefaultArguments(D); 718 719 // In this context, we *do not* check D.getInvalidType(). If the declarator 720 // type was invalid, GetTypeForDeclarator() still returns a "valid" type, 721 // though it will not reflect the user specified type. 722 return T.getAsOpaquePtr(); 723} 724 725 726 727//===----------------------------------------------------------------------===// 728// Type Attribute Processing 729//===----------------------------------------------------------------------===// 730 731/// HandleAddressSpaceTypeAttribute - Process an address_space attribute on the 732/// specified type. The attribute contains 1 argument, the id of the address 733/// space for the type. 734static void HandleAddressSpaceTypeAttribute(QualType &Type, 735 const AttributeList &Attr, Sema &S){ 736 // If this type is already address space qualified, reject it. 737 // Clause 6.7.3 - Type qualifiers: "No type shall be qualified by qualifiers 738 // for two or more different address spaces." 739 if (Type.getAddressSpace()) { 740 S.Diag(Attr.getLoc(), diag::err_attribute_address_multiple_qualifiers); 741 return; 742 } 743 744 // Check the attribute arguments. 745 if (Attr.getNumArgs() != 1) { 746 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 747 return; 748 } 749 Expr *ASArgExpr = static_cast<Expr *>(Attr.getArg(0)); 750 llvm::APSInt addrSpace(32); 751 if (!ASArgExpr->isIntegerConstantExpr(addrSpace, S.Context)) { 752 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_not_int) 753 << ASArgExpr->getSourceRange(); 754 return; 755 } 756 757 unsigned ASIdx = static_cast<unsigned>(addrSpace.getZExtValue()); 758 Type = S.Context.getASQualType(Type, ASIdx); 759} 760 761void Sema::ProcessTypeAttributeList(QualType &Result, const AttributeList *AL) { 762 // Scan through and apply attributes to this type where it makes sense. Some 763 // attributes (such as __address_space__, __vector_size__, etc) apply to the 764 // type, but others can be present in the type specifiers even though they 765 // apply to the decl. Here we apply type attributes and ignore the rest. 766 for (; AL; AL = AL->getNext()) { 767 // If this is an attribute we can handle, do so now, otherwise, add it to 768 // the LeftOverAttrs list for rechaining. 769 switch (AL->getKind()) { 770 default: break; 771 case AttributeList::AT_address_space: 772 HandleAddressSpaceTypeAttribute(Result, *AL, *this); 773 break; 774 } 775 } 776} 777 778/// @brief If the type T is incomplete and cannot be completed, 779/// produce a suitable diagnostic. 780/// 781/// This routine checks whether the type @p T is complete in any 782/// context where a complete type is required. If @p T is a complete 783/// type, returns false. If @p T is incomplete, issues the diagnostic 784/// @p diag (giving it the type @p T) and returns true. 785/// 786/// @param Loc The location in the source that the incomplete type 787/// diagnostic should refer to. 788/// 789/// @param T The type that this routine is examining for completeness. 790/// 791/// @param diag The diagnostic value (e.g., 792/// @c diag::err_typecheck_decl_incomplete_type) that will be used 793/// for the error message if @p T is incomplete. 794/// 795/// @param Range1 An optional range in the source code that will be a 796/// part of the "incomplete type" error message. 797/// 798/// @param Range2 An optional range in the source code that will be a 799/// part of the "incomplete type" error message. 800/// 801/// @param PrintType If non-NULL, the type that should be printed 802/// instead of @p T. This parameter should be used when the type that 803/// we're checking for incompleteness isn't the type that should be 804/// displayed to the user, e.g., when T is a type and PrintType is a 805/// pointer to T. 806/// 807/// @returns @c true if @p T is incomplete and a diagnostic was emitted, 808/// @c false otherwise. 809/// 810/// @todo When Clang gets proper support for C++ templates, this 811/// routine will also be able perform template instantiation when @p T 812/// is a class template specialization. 813bool Sema::DiagnoseIncompleteType(SourceLocation Loc, QualType T, unsigned diag, 814 SourceRange Range1, SourceRange Range2, 815 QualType PrintType) { 816 // If we have a complete type, we're done. 817 if (!T->isIncompleteType()) 818 return false; 819 820 if (PrintType.isNull()) 821 PrintType = T; 822 823 // We have an incomplete type. Produce a diagnostic. 824 Diag(Loc, diag) << PrintType << Range1 << Range2; 825 826 // If the type was a forward declaration of a class/struct/union 827 // type, produce 828 const TagType *Tag = 0; 829 if (const RecordType *Record = T->getAsRecordType()) 830 Tag = Record; 831 else if (const EnumType *Enum = T->getAsEnumType()) 832 Tag = Enum; 833 834 if (Tag && !Tag->getDecl()->isInvalidDecl()) 835 Diag(Tag->getDecl()->getLocation(), 836 Tag->isBeingDefined() ? diag::note_type_being_defined 837 : diag::note_forward_declaration) 838 << QualType(Tag, 0); 839 840 return true; 841} 842