SemaType.cpp revision f30208ad5b334e93582e846a2a0c92f38a607b8a
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/Basic/Diagnostic.h" 19#include "clang/Parse/DeclSpec.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(const 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_wchar: 46 if (DS.getTypeSpecSign() == DeclSpec::TSS_unspecified) 47 Result = Context.WCharTy; 48 else if (DS.getTypeSpecSign() == DeclSpec::TSS_signed) { 49 Diag(DS.getTypeSpecSignLoc(), diag::ext_invalid_sign_spec) 50 << DS.getSpecifierName(DS.getTypeSpecType()); 51 Result = Context.getSignedWCharType(); 52 } else { 53 assert(DS.getTypeSpecSign() == DeclSpec::TSS_unsigned && 54 "Unknown TSS value"); 55 Diag(DS.getTypeSpecSignLoc(), diag::ext_invalid_sign_spec) 56 << DS.getSpecifierName(DS.getTypeSpecType()); 57 Result = Context.getUnsignedWCharType(); 58 } 59 break; 60 case DeclSpec::TST_unspecified: 61 // "<proto1,proto2>" is an objc qualified ID with a missing id. 62 if (DeclSpec::ProtocolQualifierListTy PQ = DS.getProtocolQualifiers()) { 63 Result = Context.getObjCQualifiedIdType((ObjCProtocolDecl**)PQ, 64 DS.getNumProtocolQualifiers()); 65 break; 66 } 67 68 // Unspecified typespec defaults to int in C90. However, the C90 grammar 69 // [C90 6.5] only allows a decl-spec if there was *some* type-specifier, 70 // type-qualifier, or storage-class-specifier. If not, emit an extwarn. 71 // Note that the one exception to this is function definitions, which are 72 // allowed to be completely missing a declspec. This is handled in the 73 // parser already though by it pretending to have seen an 'int' in this 74 // case. 75 if (getLangOptions().ImplicitInt) { 76 if ((DS.getParsedSpecifiers() & (DeclSpec::PQ_StorageClassSpecifier | 77 DeclSpec::PQ_TypeSpecifier | 78 DeclSpec::PQ_TypeQualifier)) == 0) 79 Diag(DS.getSourceRange().getBegin(), diag::ext_missing_declspec); 80 } else { 81 // C99 and C++ require a type specifier. For example, C99 6.7.2p2 says: 82 // "At least one type specifier shall be given in the declaration 83 // specifiers in each declaration, and in the specifier-qualifier list in 84 // each struct declaration and type name." 85 if (!DS.hasTypeSpecifier()) 86 Diag(DS.getSourceRange().getBegin(), diag::ext_missing_type_specifier); 87 } 88 89 // FALL THROUGH. 90 case DeclSpec::TST_int: { 91 if (DS.getTypeSpecSign() != DeclSpec::TSS_unsigned) { 92 switch (DS.getTypeSpecWidth()) { 93 case DeclSpec::TSW_unspecified: Result = Context.IntTy; break; 94 case DeclSpec::TSW_short: Result = Context.ShortTy; break; 95 case DeclSpec::TSW_long: Result = Context.LongTy; break; 96 case DeclSpec::TSW_longlong: Result = Context.LongLongTy; break; 97 } 98 } else { 99 switch (DS.getTypeSpecWidth()) { 100 case DeclSpec::TSW_unspecified: Result = Context.UnsignedIntTy; break; 101 case DeclSpec::TSW_short: Result = Context.UnsignedShortTy; break; 102 case DeclSpec::TSW_long: Result = Context.UnsignedLongTy; break; 103 case DeclSpec::TSW_longlong: Result =Context.UnsignedLongLongTy; break; 104 } 105 } 106 break; 107 } 108 case DeclSpec::TST_float: Result = Context.FloatTy; break; 109 case DeclSpec::TST_double: 110 if (DS.getTypeSpecWidth() == DeclSpec::TSW_long) 111 Result = Context.LongDoubleTy; 112 else 113 Result = Context.DoubleTy; 114 break; 115 case DeclSpec::TST_bool: Result = Context.BoolTy; break; // _Bool or bool 116 case DeclSpec::TST_decimal32: // _Decimal32 117 case DeclSpec::TST_decimal64: // _Decimal64 118 case DeclSpec::TST_decimal128: // _Decimal128 119 assert(0 && "FIXME: GNU decimal extensions not supported yet!"); 120 case DeclSpec::TST_class: 121 case DeclSpec::TST_enum: 122 case DeclSpec::TST_union: 123 case DeclSpec::TST_struct: { 124 Decl *D = static_cast<Decl *>(DS.getTypeRep()); 125 assert(D && "Didn't get a decl for a class/enum/union/struct?"); 126 assert(DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 && 127 DS.getTypeSpecSign() == 0 && 128 "Can't handle qualifiers on typedef names yet!"); 129 // TypeQuals handled by caller. 130 Result = Context.getTypeDeclType(cast<TypeDecl>(D)); 131 break; 132 } 133 case DeclSpec::TST_typedef: { 134 Decl *D = static_cast<Decl *>(DS.getTypeRep()); 135 assert(D && "Didn't get a decl for a typedef?"); 136 assert(DS.getTypeSpecWidth() == 0 && DS.getTypeSpecComplex() == 0 && 137 DS.getTypeSpecSign() == 0 && 138 "Can't handle qualifiers on typedef names yet!"); 139 DeclSpec::ProtocolQualifierListTy PQ = DS.getProtocolQualifiers(); 140 141 // FIXME: Adding a TST_objcInterface clause doesn't seem ideal, so 142 // we have this "hack" for now... 143 if (ObjCInterfaceDecl *ObjCIntDecl = dyn_cast<ObjCInterfaceDecl>(D)) { 144 if (PQ == 0) { 145 Result = Context.getObjCInterfaceType(ObjCIntDecl); 146 break; 147 } 148 149 Result = Context.getObjCQualifiedInterfaceType(ObjCIntDecl, 150 (ObjCProtocolDecl**)PQ, 151 DS.getNumProtocolQualifiers()); 152 break; 153 } else if (TypedefDecl *typeDecl = dyn_cast<TypedefDecl>(D)) { 154 if (Context.getObjCIdType() == Context.getTypedefType(typeDecl) && PQ) { 155 // id<protocol-list> 156 Result = Context.getObjCQualifiedIdType((ObjCProtocolDecl**)PQ, 157 DS.getNumProtocolQualifiers()); 158 break; 159 } 160 } 161 // TypeQuals handled by caller. 162 Result = Context.getTypeDeclType(dyn_cast<TypeDecl>(D)); 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 } 179 180 // Handle complex types. 181 if (DS.getTypeSpecComplex() == DeclSpec::TSC_complex) 182 Result = Context.getComplexType(Result); 183 184 assert(DS.getTypeSpecComplex() != DeclSpec::TSC_imaginary && 185 "FIXME: imaginary types not supported yet!"); 186 187 // See if there are any attributes on the declspec that apply to the type (as 188 // opposed to the decl). 189 if (const AttributeList *AL = DS.getAttributes()) 190 ProcessTypeAttributeList(Result, AL); 191 192 // Apply const/volatile/restrict qualifiers to T. 193 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 194 195 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 196 // or incomplete types shall not be restrict-qualified." C++ also allows 197 // restrict-qualified references. 198 if (TypeQuals & QualType::Restrict) { 199 if (const PointerLikeType *PT = Result->getAsPointerLikeType()) { 200 QualType EltTy = PT->getPointeeType(); 201 202 // If we have a pointer or reference, the pointee must have an object or 203 // incomplete type. 204 if (!EltTy->isIncompleteOrObjectType()) { 205 Diag(DS.getRestrictSpecLoc(), 206 diag::err_typecheck_invalid_restrict_invalid_pointee) 207 << EltTy << DS.getSourceRange(); 208 TypeQuals &= ~QualType::Restrict; // Remove the restrict qualifier. 209 } 210 } else { 211 Diag(DS.getRestrictSpecLoc(), 212 diag::err_typecheck_invalid_restrict_not_pointer) 213 << Result << DS.getSourceRange(); 214 TypeQuals &= ~QualType::Restrict; // Remove the restrict qualifier. 215 } 216 } 217 218 // Warn about CV qualifiers on functions: C99 6.7.3p8: "If the specification 219 // of a function type includes any type qualifiers, the behavior is 220 // undefined." 221 if (Result->isFunctionType() && TypeQuals) { 222 // Get some location to point at, either the C or V location. 223 SourceLocation Loc; 224 if (TypeQuals & QualType::Const) 225 Loc = DS.getConstSpecLoc(); 226 else { 227 assert((TypeQuals & QualType::Volatile) && 228 "Has CV quals but not C or V?"); 229 Loc = DS.getVolatileSpecLoc(); 230 } 231 Diag(Loc, diag::warn_typecheck_function_qualifiers) 232 << Result << DS.getSourceRange(); 233 } 234 235 // C++ [dcl.ref]p1: 236 // Cv-qualified references are ill-formed except when the 237 // cv-qualifiers are introduced through the use of a typedef 238 // (7.1.3) or of a template type argument (14.3), in which 239 // case the cv-qualifiers are ignored. 240 if (DS.getTypeSpecType() == DeclSpec::TST_typedef && 241 TypeQuals && Result->isReferenceType()) { 242 TypeQuals &= ~QualType::Const; 243 TypeQuals &= ~QualType::Volatile; 244 } 245 246 Result = Result.getQualifiedType(TypeQuals); 247 } 248 return Result; 249} 250 251/// GetTypeForDeclarator - Convert the type for the specified declarator to Type 252/// instances. Skip the outermost Skip type objects. 253QualType Sema::GetTypeForDeclarator(Declarator &D, Scope *S, unsigned Skip) { 254 // long long is a C99 feature. 255 if (!getLangOptions().C99 && !getLangOptions().CPlusPlus0x && 256 D.getDeclSpec().getTypeSpecWidth() == DeclSpec::TSW_longlong) 257 Diag(D.getDeclSpec().getTypeSpecWidthLoc(), diag::ext_longlong); 258 259 QualType T = ConvertDeclSpecToType(D.getDeclSpec()); 260 261 // Walk the DeclTypeInfo, building the recursive type as we go. DeclTypeInfos 262 // are ordered from the identifier out, which is opposite of what we want :). 263 for (unsigned i = Skip, e = D.getNumTypeObjects(); i != e; ++i) { 264 DeclaratorChunk &DeclType = D.getTypeObject(e-i-1+Skip); 265 switch (DeclType.Kind) { 266 default: assert(0 && "Unknown decltype!"); 267 case DeclaratorChunk::BlockPointer: 268 if (DeclType.Cls.TypeQuals) 269 Diag(D.getIdentifierLoc(), diag::err_qualified_block_pointer_type); 270 if (!T.getTypePtr()->isFunctionType()) 271 Diag(D.getIdentifierLoc(), diag::err_nonfunction_block_type); 272 else 273 T = Context.getBlockPointerType(T); 274 break; 275 case DeclaratorChunk::Pointer: 276 if (T->isReferenceType()) { 277 // C++ 8.3.2p4: There shall be no ... pointers to references ... 278 Diag(DeclType.Loc, diag::err_illegal_decl_pointer_to_reference) 279 << (D.getIdentifier() ? D.getIdentifier()->getName() : "type name"); 280 D.setInvalidType(true); 281 T = Context.IntTy; 282 } 283 284 // Enforce C99 6.7.3p2: "Types other than pointer types derived from 285 // object or incomplete types shall not be restrict-qualified." 286 if ((DeclType.Ptr.TypeQuals & QualType::Restrict) && 287 !T->isIncompleteOrObjectType()) { 288 Diag(DeclType.Loc, diag::err_typecheck_invalid_restrict_invalid_pointee) 289 << T; 290 DeclType.Ptr.TypeQuals &= ~QualType::Restrict; 291 } 292 293 // Apply the pointer typequals to the pointer object. 294 T = Context.getPointerType(T).getQualifiedType(DeclType.Ptr.TypeQuals); 295 break; 296 case DeclaratorChunk::Reference: { 297 // Whether we should suppress the creation of the reference. 298 bool SuppressReference = false; 299 if (T->isReferenceType()) { 300 // C++ [dcl.ref]p4: There shall be no references to references. 301 // 302 // According to C++ DR 106, references to references are only 303 // diagnosed when they are written directly (e.g., "int & &"), 304 // but not when they happen via a typedef: 305 // 306 // typedef int& intref; 307 // typedef intref& intref2; 308 // 309 // Parser::ParserDeclaratorInternal diagnoses the case where 310 // references are written directly; here, we handle the 311 // collapsing of references-to-references as described in C++ 312 // DR 106 and amended by C++ DR 540. 313 SuppressReference = true; 314 } 315 316 // C++ [dcl.ref]p1: 317 // A declarator that specifies the type “reference to cv void” 318 // is ill-formed. 319 if (T->isVoidType()) { 320 Diag(DeclType.Loc, diag::err_reference_to_void); 321 D.setInvalidType(true); 322 T = Context.IntTy; 323 } 324 325 // Enforce C99 6.7.3p2: "Types other than pointer types derived from 326 // object or incomplete types shall not be restrict-qualified." 327 if (DeclType.Ref.HasRestrict && 328 !T->isIncompleteOrObjectType()) { 329 Diag(DeclType.Loc, diag::err_typecheck_invalid_restrict_invalid_pointee) 330 << T; 331 DeclType.Ref.HasRestrict = false; 332 } 333 334 if (!SuppressReference) 335 T = Context.getReferenceType(T); 336 337 // Handle restrict on references. 338 if (DeclType.Ref.HasRestrict) 339 T.addRestrict(); 340 break; 341 } 342 case DeclaratorChunk::Array: { 343 DeclaratorChunk::ArrayTypeInfo &ATI = DeclType.Arr; 344 Expr *ArraySize = static_cast<Expr*>(ATI.NumElts); 345 ArrayType::ArraySizeModifier ASM; 346 if (ATI.isStar) 347 ASM = ArrayType::Star; 348 else if (ATI.hasStatic) 349 ASM = ArrayType::Static; 350 else 351 ASM = ArrayType::Normal; 352 353 // C99 6.7.5.2p1: If the element type is an incomplete or function type, 354 // reject it (e.g. void ary[7], struct foo ary[7], void ary[7]()) 355 if (DiagnoseIncompleteType(D.getIdentifierLoc(), T, 356 diag::err_illegal_decl_array_incomplete_type)) { 357 T = Context.IntTy; 358 D.setInvalidType(true); 359 } else if (T->isFunctionType()) { 360 Diag(D.getIdentifierLoc(), diag::err_illegal_decl_array_of_functions) 361 << (D.getIdentifier() ? D.getIdentifier()->getName() : "type name"); 362 T = Context.getPointerType(T); 363 D.setInvalidType(true); 364 } else if (const ReferenceType *RT = T->getAsReferenceType()) { 365 // C++ 8.3.2p4: There shall be no ... arrays of references ... 366 Diag(D.getIdentifierLoc(), diag::err_illegal_decl_array_of_references) 367 << (D.getIdentifier() ? D.getIdentifier()->getName() : "type name"); 368 T = RT->getPointeeType(); 369 D.setInvalidType(true); 370 } else if (const RecordType *EltTy = T->getAsRecordType()) { 371 // If the element type is a struct or union that contains a variadic 372 // array, reject it: C99 6.7.2.1p2. 373 if (EltTy->getDecl()->hasFlexibleArrayMember()) { 374 Diag(DeclType.Loc, diag::err_flexible_array_in_array) << T; 375 T = Context.IntTy; 376 D.setInvalidType(true); 377 } 378 } else if (T->isObjCInterfaceType()) { 379 Diag(DeclType.Loc, diag::warn_objc_array_of_interfaces) << T; 380 } 381 382 // C99 6.7.5.2p1: The size expression shall have integer type. 383 if (ArraySize && !ArraySize->getType()->isIntegerType()) { 384 Diag(ArraySize->getLocStart(), diag::err_array_size_non_int) 385 << ArraySize->getType() << ArraySize->getSourceRange(); 386 D.setInvalidType(true); 387 delete ArraySize; 388 ATI.NumElts = ArraySize = 0; 389 } 390 llvm::APSInt ConstVal(32); 391 if (!ArraySize) { 392 T = Context.getIncompleteArrayType(T, ASM, ATI.TypeQuals); 393 } else if (ArraySize->isValueDependent()) { 394 T = Context.getDependentSizedArrayType(T, ArraySize, ASM, ATI.TypeQuals); 395 } else if (!ArraySize->isIntegerConstantExpr(ConstVal, Context) || 396 !T->isConstantSizeType()) { 397 // Per C99, a variable array is an array with either a non-constant 398 // size or an element type that has a non-constant-size 399 T = Context.getVariableArrayType(T, ArraySize, ASM, ATI.TypeQuals); 400 } else { 401 // C99 6.7.5.2p1: If the expression is a constant expression, it shall 402 // have a value greater than zero. 403 if (ConstVal.isSigned()) { 404 if (ConstVal.isNegative()) { 405 Diag(ArraySize->getLocStart(), 406 diag::err_typecheck_negative_array_size) 407 << ArraySize->getSourceRange(); 408 D.setInvalidType(true); 409 } else if (ConstVal == 0) { 410 // GCC accepts zero sized static arrays. 411 Diag(ArraySize->getLocStart(), diag::ext_typecheck_zero_array_size) 412 << ArraySize->getSourceRange(); 413 } 414 } 415 T = Context.getConstantArrayType(T, ConstVal, ASM, ATI.TypeQuals); 416 } 417 // If this is not C99, extwarn about VLA's and C99 array size modifiers. 418 if (!getLangOptions().C99) { 419 if (ArraySize && !ArraySize->isValueDependent() && 420 !ArraySize->isIntegerConstantExpr(Context)) 421 Diag(D.getIdentifierLoc(), diag::ext_vla); 422 else if (ASM != ArrayType::Normal || ATI.TypeQuals != 0) 423 Diag(D.getIdentifierLoc(), diag::ext_c99_array_usage); 424 } 425 break; 426 } 427 case DeclaratorChunk::Function: { 428 // If the function declarator has a prototype (i.e. it is not () and 429 // does not have a K&R-style identifier list), then the arguments are part 430 // of the type, otherwise the argument list is (). 431 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun; 432 433 // C99 6.7.5.3p1: The return type may not be a function or array type. 434 if (T->isArrayType() || T->isFunctionType()) { 435 Diag(DeclType.Loc, diag::err_func_returning_array_function) << T; 436 T = Context.IntTy; 437 D.setInvalidType(true); 438 } 439 440 if (FTI.NumArgs == 0) { 441 if (getLangOptions().CPlusPlus) { 442 // C++ 8.3.5p2: If the parameter-declaration-clause is empty, the 443 // function takes no arguments. 444 T = Context.getFunctionType(T, NULL, 0, FTI.isVariadic,FTI.TypeQuals); 445 } else { 446 // Simple void foo(), where the incoming T is the result type. 447 T = Context.getFunctionTypeNoProto(T); 448 } 449 } else if (FTI.ArgInfo[0].Param == 0) { 450 // C99 6.7.5.3p3: Reject int(x,y,z) when it's not a function definition. 451 Diag(FTI.ArgInfo[0].IdentLoc, diag::err_ident_list_in_fn_declaration); 452 } else { 453 // Otherwise, we have a function with an argument list that is 454 // potentially variadic. 455 llvm::SmallVector<QualType, 16> ArgTys; 456 457 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 458 ParmVarDecl *Param = (ParmVarDecl *)FTI.ArgInfo[i].Param; 459 QualType ArgTy = Param->getType(); 460 assert(!ArgTy.isNull() && "Couldn't parse type?"); 461 // 462 // Perform the default function/array conversion (C99 6.7.5.3p[7,8]). 463 // This matches the conversion that is done in 464 // Sema::ActOnParamDeclarator(). Without this conversion, the 465 // argument type in the function prototype *will not* match the 466 // type in ParmVarDecl (which makes the code generator unhappy). 467 // 468 // FIXME: We still apparently need the conversion in 469 // Sema::ActOnParamDeclarator(). This doesn't make any sense, since 470 // it should be driving off the type being created here. 471 // 472 // FIXME: If a source translation tool needs to see the original type, 473 // then we need to consider storing both types somewhere... 474 // 475 if (ArgTy->isArrayType()) { 476 ArgTy = Context.getArrayDecayedType(ArgTy); 477 } else if (ArgTy->isFunctionType()) 478 ArgTy = Context.getPointerType(ArgTy); 479 480 // Look for 'void'. void is allowed only as a single argument to a 481 // function with no other parameters (C99 6.7.5.3p10). We record 482 // int(void) as a FunctionTypeProto with an empty argument list. 483 else if (ArgTy->isVoidType()) { 484 // If this is something like 'float(int, void)', reject it. 'void' 485 // is an incomplete type (C99 6.2.5p19) and function decls cannot 486 // have arguments of incomplete type. 487 if (FTI.NumArgs != 1 || FTI.isVariadic) { 488 Diag(DeclType.Loc, diag::err_void_only_param); 489 ArgTy = Context.IntTy; 490 Param->setType(ArgTy); 491 } else if (FTI.ArgInfo[i].Ident) { 492 // Reject, but continue to parse 'int(void abc)'. 493 Diag(FTI.ArgInfo[i].IdentLoc, 494 diag::err_param_with_void_type); 495 ArgTy = Context.IntTy; 496 Param->setType(ArgTy); 497 } else { 498 // Reject, but continue to parse 'float(const void)'. 499 if (ArgTy.getCVRQualifiers()) 500 Diag(DeclType.Loc, diag::err_void_param_qualified); 501 502 // Do not add 'void' to the ArgTys list. 503 break; 504 } 505 } else if (!FTI.hasPrototype) { 506 if (ArgTy->isPromotableIntegerType()) { 507 ArgTy = Context.IntTy; 508 } else if (const BuiltinType* BTy = ArgTy->getAsBuiltinType()) { 509 if (BTy->getKind() == BuiltinType::Float) 510 ArgTy = Context.DoubleTy; 511 } 512 } 513 514 ArgTys.push_back(ArgTy); 515 } 516 T = Context.getFunctionType(T, &ArgTys[0], ArgTys.size(), 517 FTI.isVariadic, FTI.TypeQuals); 518 } 519 break; 520 } 521 case DeclaratorChunk::MemberPointer: 522 // The scope spec must refer to a class, or be dependent. 523 DeclContext *DC = static_cast<DeclContext*>( 524 DeclType.Mem.Scope().getScopeRep()); 525 QualType ClsType; 526 // FIXME: Extend for dependent types when it's actually supported. 527 // See ActOnCXXNestedNameSpecifier. 528 if (CXXRecordDecl *RD = dyn_cast_or_null<CXXRecordDecl>(DC)) { 529 ClsType = Context.getTagDeclType(RD); 530 } else { 531 if (DC) { 532 Diag(DeclType.Mem.Scope().getBeginLoc(), 533 diag::err_illegal_decl_mempointer_in_nonclass) 534 << (D.getIdentifier() ? D.getIdentifier()->getName() : "type name") 535 << DeclType.Mem.Scope().getRange(); 536 } 537 D.setInvalidType(true); 538 ClsType = Context.IntTy; 539 } 540 541 // C++ 8.3.3p3: A pointer to member shall not pointer to ... a member 542 // with reference type, or "cv void." 543 if (T->isReferenceType()) { 544 Diag(DeclType.Loc, diag::err_illegal_decl_pointer_to_reference) 545 << (D.getIdentifier() ? D.getIdentifier()->getName() : "type name"); 546 D.setInvalidType(true); 547 T = Context.IntTy; 548 } 549 if (T->isVoidType()) { 550 Diag(DeclType.Loc, diag::err_illegal_decl_mempointer_to_void) 551 << (D.getIdentifier() ? D.getIdentifier()->getName() : "type name"); 552 T = Context.IntTy; 553 } 554 555 // Enforce C99 6.7.3p2: "Types other than pointer types derived from 556 // object or incomplete types shall not be restrict-qualified." 557 if ((DeclType.Mem.TypeQuals & QualType::Restrict) && 558 !T->isIncompleteOrObjectType()) { 559 Diag(DeclType.Loc, diag::err_typecheck_invalid_restrict_invalid_pointee) 560 << T; 561 DeclType.Mem.TypeQuals &= ~QualType::Restrict; 562 } 563 564 T = Context.getMemberPointerType(T, ClsType.getTypePtr()); 565 566 break; 567 } 568 569 // See if there are any attributes on this declarator chunk. 570 if (const AttributeList *AL = DeclType.getAttrs()) 571 ProcessTypeAttributeList(T, AL); 572 } 573 574 if (getLangOptions().CPlusPlus && T->isFunctionType()) { 575 const FunctionTypeProto *FnTy = T->getAsFunctionTypeProto(); 576 assert(FnTy && "Why oh why is there not a FunctionTypeProto here ?"); 577 578 // C++ 8.3.5p4: A cv-qualifier-seq shall only be part of the function type 579 // for a nonstatic member function, the function type to which a pointer 580 // to member refers, or the top-level function type of a function typedef 581 // declaration. 582 if (FnTy->getTypeQuals() != 0 && 583 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 584 ((D.getContext() != Declarator::MemberContext && 585 (!D.getCXXScopeSpec().isSet() || 586 !static_cast<DeclContext*>(D.getCXXScopeSpec().getScopeRep()) 587 ->isRecord())) || 588 D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_static)) { 589 if (D.isFunctionDeclarator()) 590 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_function_type); 591 else 592 Diag(D.getIdentifierLoc(), 593 diag::err_invalid_qualified_typedef_function_type_use); 594 595 // Strip the cv-quals from the type. 596 T = Context.getFunctionType(FnTy->getResultType(), FnTy->arg_type_begin(), 597 FnTy->getNumArgs(), FnTy->isVariadic(), 0); 598 } 599 } 600 601 // If there were any type attributes applied to the decl itself (not the 602 // type, apply the type attribute to the type!) 603 if (const AttributeList *Attrs = D.getAttributes()) 604 ProcessTypeAttributeList(T, Attrs); 605 606 return T; 607} 608 609/// ObjCGetTypeForMethodDefinition - Builds the type for a method definition 610/// declarator 611QualType Sema::ObjCGetTypeForMethodDefinition(DeclTy *D) { 612 ObjCMethodDecl *MDecl = dyn_cast<ObjCMethodDecl>(static_cast<Decl *>(D)); 613 QualType T = MDecl->getResultType(); 614 llvm::SmallVector<QualType, 16> ArgTys; 615 616 // Add the first two invisible argument types for self and _cmd. 617 if (MDecl->isInstanceMethod()) { 618 QualType selfTy = Context.getObjCInterfaceType(MDecl->getClassInterface()); 619 selfTy = Context.getPointerType(selfTy); 620 ArgTys.push_back(selfTy); 621 } 622 else 623 ArgTys.push_back(Context.getObjCIdType()); 624 ArgTys.push_back(Context.getObjCSelType()); 625 626 for (int i = 0, e = MDecl->getNumParams(); i != e; ++i) { 627 ParmVarDecl *PDecl = MDecl->getParamDecl(i); 628 QualType ArgTy = PDecl->getType(); 629 assert(!ArgTy.isNull() && "Couldn't parse type?"); 630 // Perform the default function/array conversion (C99 6.7.5.3p[7,8]). 631 // This matches the conversion that is done in 632 // Sema::ActOnParamDeclarator(). 633 if (ArgTy->isArrayType()) 634 ArgTy = Context.getArrayDecayedType(ArgTy); 635 else if (ArgTy->isFunctionType()) 636 ArgTy = Context.getPointerType(ArgTy); 637 ArgTys.push_back(ArgTy); 638 } 639 T = Context.getFunctionType(T, &ArgTys[0], ArgTys.size(), 640 MDecl->isVariadic(), 0); 641 return T; 642} 643 644/// UnwrapSimilarPointerTypes - If T1 and T2 are pointer types (FIXME: 645/// or pointer-to-member types) that may be similar (C++ 4.4), 646/// replaces T1 and T2 with the type that they point to and return 647/// true. If T1 and T2 aren't pointer types or pointer-to-member 648/// types, or if they are not similar at this level, returns false and 649/// leaves T1 and T2 unchanged. Top-level qualifiers on T1 and T2 are 650/// ignored. This function will typically be called in a loop that 651/// successively "unwraps" pointer and pointer-to-member types to 652/// compare them at each level. 653bool Sema::UnwrapSimilarPointerTypes(QualType& T1, QualType& T2) 654{ 655 const PointerType *T1PtrType = T1->getAsPointerType(), 656 *T2PtrType = T2->getAsPointerType(); 657 if (T1PtrType && T2PtrType) { 658 T1 = T1PtrType->getPointeeType(); 659 T2 = T2PtrType->getPointeeType(); 660 return true; 661 } 662 663 // FIXME: pointer-to-member types 664 return false; 665} 666 667Sema::TypeResult Sema::ActOnTypeName(Scope *S, Declarator &D) { 668 // C99 6.7.6: Type names have no identifier. This is already validated by 669 // the parser. 670 assert(D.getIdentifier() == 0 && "Type name should have no identifier!"); 671 672 QualType T = GetTypeForDeclarator(D, S); 673 674 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 675 676 // Check that there are no default arguments (C++ only). 677 if (getLangOptions().CPlusPlus) 678 CheckExtraCXXDefaultArguments(D); 679 680 // In this context, we *do not* check D.getInvalidType(). If the declarator 681 // type was invalid, GetTypeForDeclarator() still returns a "valid" type, 682 // though it will not reflect the user specified type. 683 return T.getAsOpaquePtr(); 684} 685 686 687 688//===----------------------------------------------------------------------===// 689// Type Attribute Processing 690//===----------------------------------------------------------------------===// 691 692/// HandleAddressSpaceTypeAttribute - Process an address_space attribute on the 693/// specified type. The attribute contains 1 argument, the id of the address 694/// space for the type. 695static void HandleAddressSpaceTypeAttribute(QualType &Type, 696 const AttributeList &Attr, Sema &S){ 697 // If this type is already address space qualified, reject it. 698 // Clause 6.7.3 - Type qualifiers: "No type shall be qualified by qualifiers 699 // for two or more different address spaces." 700 if (Type.getAddressSpace()) { 701 S.Diag(Attr.getLoc(), diag::err_attribute_address_multiple_qualifiers); 702 return; 703 } 704 705 // Check the attribute arguments. 706 if (Attr.getNumArgs() != 1) { 707 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 708 return; 709 } 710 Expr *ASArgExpr = static_cast<Expr *>(Attr.getArg(0)); 711 llvm::APSInt addrSpace(32); 712 if (!ASArgExpr->isIntegerConstantExpr(addrSpace, S.Context)) { 713 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_not_int) 714 << ASArgExpr->getSourceRange(); 715 return; 716 } 717 718 unsigned ASIdx = static_cast<unsigned>(addrSpace.getZExtValue()); 719 Type = S.Context.getASQualType(Type, ASIdx); 720} 721 722void Sema::ProcessTypeAttributeList(QualType &Result, const AttributeList *AL) { 723 // Scan through and apply attributes to this type where it makes sense. Some 724 // attributes (such as __address_space__, __vector_size__, etc) apply to the 725 // type, but others can be present in the type specifiers even though they 726 // apply to the decl. Here we apply type attributes and ignore the rest. 727 for (; AL; AL = AL->getNext()) { 728 // If this is an attribute we can handle, do so now, otherwise, add it to 729 // the LeftOverAttrs list for rechaining. 730 switch (AL->getKind()) { 731 default: break; 732 case AttributeList::AT_address_space: 733 HandleAddressSpaceTypeAttribute(Result, *AL, *this); 734 break; 735 } 736 } 737} 738 739/// @brief If the type T is incomplete and cannot be completed, 740/// produce a suitable diagnostic. 741/// 742/// This routine checks whether the type @p T is complete in any 743/// context where a complete type is required. If @p T is a complete 744/// type, returns false. If @p T is incomplete, issues the diagnostic 745/// @p diag (giving it the type @p T) and returns true. 746/// 747/// @param Loc The location in the source that the incomplete type 748/// diagnostic should refer to. 749/// 750/// @param T The type that this routine is examining for completeness. 751/// 752/// @param diag The diagnostic value (e.g., 753/// @c diag::err_typecheck_decl_incomplete_type) that will be used 754/// for the error message if @p T is incomplete. 755/// 756/// @param Range1 An optional range in the source code that will be a 757/// part of the "incomplete type" error message. 758/// 759/// @param Range2 An optional range in the source code that will be a 760/// part of the "incomplete type" error message. 761/// 762/// @param PrintType If non-NULL, the type that should be printed 763/// instead of @p T. This parameter should be used when the type that 764/// we're checking for incompleteness isn't the type that should be 765/// displayed to the user, e.g., when T is a type and PrintType is a 766/// pointer to T. 767/// 768/// @returns @c true if @p T is incomplete and a diagnostic was emitted, 769/// @c false otherwise. 770/// 771/// @todo When Clang gets proper support for C++ templates, this 772/// routine will also be able perform template instantiation when @p T 773/// is a class template specialization. 774bool Sema::DiagnoseIncompleteType(SourceLocation Loc, QualType T, unsigned diag, 775 SourceRange Range1, SourceRange Range2, 776 QualType PrintType) { 777 // If we have a complete type, we're done. 778 if (!T->isIncompleteType()) 779 return false; 780 781 if (PrintType.isNull()) 782 PrintType = T; 783 784 // We have an incomplete type. Produce a diagnostic. 785 Diag(Loc, diag) << PrintType << Range1 << Range2; 786 787 // If the type was a forward declaration of a class/struct/union 788 // type, produce 789 const TagType *Tag = 0; 790 if (const RecordType *Record = T->getAsRecordType()) 791 Tag = Record; 792 else if (const EnumType *Enum = T->getAsEnumType()) 793 Tag = Enum; 794 795 if (Tag && !Tag->getDecl()->isInvalidDecl()) 796 Diag(Tag->getDecl()->getLocation(), 797 Tag->isBeingDefined() ? diag::note_type_being_defined 798 : diag::note_forward_declaration) 799 << QualType(Tag, 0); 800 801 return true; 802} 803