SemaType.cpp revision f3a41af4d5c98a72a1d6720bbbfd658e57ef2541
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.getAsString() << 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.getAsString() << 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.getAsString() << 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. 253QualType Sema::GetTypeForDeclarator(Declarator &D, Scope *S) { 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 = 0, e = D.getNumTypeObjects(); i != e; ++i) { 264 DeclaratorChunk &DeclType = D.getTypeObject(e-i-1); 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.getAsString(); 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.getAsString(); 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 (T->isIncompleteType()) { 356 Diag(D.getIdentifierLoc(), diag::err_illegal_decl_array_incomplete_type) 357 << T.getAsString(); 358 T = Context.IntTy; 359 D.setInvalidType(true); 360 } else if (T->isFunctionType()) { 361 Diag(D.getIdentifierLoc(), diag::err_illegal_decl_array_of_functions) 362 << (D.getIdentifier() ? D.getIdentifier()->getName() : "type name"); 363 T = Context.getPointerType(T); 364 D.setInvalidType(true); 365 } else if (const ReferenceType *RT = T->getAsReferenceType()) { 366 // C++ 8.3.2p4: There shall be no ... arrays of references ... 367 Diag(D.getIdentifierLoc(), diag::err_illegal_decl_array_of_references) 368 << (D.getIdentifier() ? D.getIdentifier()->getName() : "type name"); 369 T = RT->getPointeeType(); 370 D.setInvalidType(true); 371 } else if (const RecordType *EltTy = T->getAsRecordType()) { 372 // If the element type is a struct or union that contains a variadic 373 // array, reject it: C99 6.7.2.1p2. 374 if (EltTy->getDecl()->hasFlexibleArrayMember()) { 375 Diag(DeclType.Loc, diag::err_flexible_array_in_array) 376 << T.getAsString(); 377 T = Context.IntTy; 378 D.setInvalidType(true); 379 } 380 } else if (T->isObjCInterfaceType()) { 381 Diag(DeclType.Loc, diag::warn_objc_array_of_interfaces) 382 << T.getAsString(); 383 } 384 385 // C99 6.7.5.2p1: The size expression shall have integer type. 386 if (ArraySize && !ArraySize->getType()->isIntegerType()) { 387 Diag(ArraySize->getLocStart(), diag::err_array_size_non_int) 388 << ArraySize->getType().getAsString() << ArraySize->getSourceRange(); 389 D.setInvalidType(true); 390 delete ArraySize; 391 ATI.NumElts = ArraySize = 0; 392 } 393 llvm::APSInt ConstVal(32); 394 if (!ArraySize) { 395 T = Context.getIncompleteArrayType(T, ASM, ATI.TypeQuals); 396 } else if (!ArraySize->isIntegerConstantExpr(ConstVal, Context) || 397 !T->isConstantSizeType()) { 398 // Per C99, a variable array is an array with either a non-constant 399 // size or an element type that has a non-constant-size 400 T = Context.getVariableArrayType(T, ArraySize, ASM, ATI.TypeQuals); 401 } else { 402 // C99 6.7.5.2p1: If the expression is a constant expression, it shall 403 // have a value greater than zero. 404 if (ConstVal.isSigned()) { 405 if (ConstVal.isNegative()) { 406 Diag(ArraySize->getLocStart(), 407 diag::err_typecheck_negative_array_size) 408 << ArraySize->getSourceRange(); 409 D.setInvalidType(true); 410 } else if (ConstVal == 0) { 411 // GCC accepts zero sized static arrays. 412 Diag(ArraySize->getLocStart(), diag::ext_typecheck_zero_array_size) 413 << ArraySize->getSourceRange(); 414 } 415 } 416 T = Context.getConstantArrayType(T, ConstVal, ASM, ATI.TypeQuals); 417 } 418 // If this is not C99, extwarn about VLA's and C99 array size modifiers. 419 if (!getLangOptions().C99 && 420 (ASM != ArrayType::Normal || 421 (ArraySize && !ArraySize->isIntegerConstantExpr(Context)))) 422 Diag(D.getIdentifierLoc(), diag::ext_vla); 423 break; 424 } 425 case DeclaratorChunk::Function: 426 // If the function declarator has a prototype (i.e. it is not () and 427 // does not have a K&R-style identifier list), then the arguments are part 428 // of the type, otherwise the argument list is (). 429 const DeclaratorChunk::FunctionTypeInfo &FTI = DeclType.Fun; 430 431 // C99 6.7.5.3p1: The return type may not be a function or array type. 432 if (T->isArrayType() || T->isFunctionType()) { 433 Diag(DeclType.Loc, diag::err_func_returning_array_function) 434 << T.getAsString(); 435 T = Context.IntTy; 436 D.setInvalidType(true); 437 } 438 439 if (FTI.NumArgs == 0) { 440 if (getLangOptions().CPlusPlus) { 441 // C++ 8.3.5p2: If the parameter-declaration-clause is empty, the 442 // function takes no arguments. 443 T = Context.getFunctionType(T, NULL, 0, FTI.isVariadic,FTI.TypeQuals); 444 } else { 445 // Simple void foo(), where the incoming T is the result type. 446 T = Context.getFunctionTypeNoProto(T); 447 } 448 } else if (FTI.ArgInfo[0].Param == 0) { 449 // C99 6.7.5.3p3: Reject int(x,y,z) when it's not a function definition. 450 Diag(FTI.ArgInfo[0].IdentLoc, diag::err_ident_list_in_fn_declaration); 451 } else { 452 // Otherwise, we have a function with an argument list that is 453 // potentially variadic. 454 llvm::SmallVector<QualType, 16> ArgTys; 455 456 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 457 ParmVarDecl *Param = (ParmVarDecl *)FTI.ArgInfo[i].Param; 458 QualType ArgTy = Param->getType(); 459 assert(!ArgTy.isNull() && "Couldn't parse type?"); 460 // 461 // Perform the default function/array conversion (C99 6.7.5.3p[7,8]). 462 // This matches the conversion that is done in 463 // Sema::ActOnParamDeclarator(). Without this conversion, the 464 // argument type in the function prototype *will not* match the 465 // type in ParmVarDecl (which makes the code generator unhappy). 466 // 467 // FIXME: We still apparently need the conversion in 468 // Sema::ActOnParamDeclarator(). This doesn't make any sense, since 469 // it should be driving off the type being created here. 470 // 471 // FIXME: If a source translation tool needs to see the original type, 472 // then we need to consider storing both types somewhere... 473 // 474 if (ArgTy->isArrayType()) { 475 ArgTy = Context.getArrayDecayedType(ArgTy); 476 } else if (ArgTy->isFunctionType()) 477 ArgTy = Context.getPointerType(ArgTy); 478 479 // Look for 'void'. void is allowed only as a single argument to a 480 // function with no other parameters (C99 6.7.5.3p10). We record 481 // int(void) as a FunctionTypeProto with an empty argument list. 482 else if (ArgTy->isVoidType()) { 483 // If this is something like 'float(int, void)', reject it. 'void' 484 // is an incomplete type (C99 6.2.5p19) and function decls cannot 485 // have arguments of incomplete type. 486 if (FTI.NumArgs != 1 || FTI.isVariadic) { 487 Diag(DeclType.Loc, diag::err_void_only_param); 488 ArgTy = Context.IntTy; 489 Param->setType(ArgTy); 490 } else if (FTI.ArgInfo[i].Ident) { 491 // Reject, but continue to parse 'int(void abc)'. 492 Diag(FTI.ArgInfo[i].IdentLoc, 493 diag::err_param_with_void_type); 494 ArgTy = Context.IntTy; 495 Param->setType(ArgTy); 496 } else { 497 // Reject, but continue to parse 'float(const void)'. 498 if (ArgTy.getCVRQualifiers()) 499 Diag(DeclType.Loc, diag::err_void_param_qualified); 500 501 // Do not add 'void' to the ArgTys list. 502 break; 503 } 504 } else if (!FTI.hasPrototype) { 505 if (ArgTy->isPromotableIntegerType()) { 506 ArgTy = Context.IntTy; 507 } else if (const BuiltinType* BTy = ArgTy->getAsBuiltinType()) { 508 if (BTy->getKind() == BuiltinType::Float) 509 ArgTy = Context.DoubleTy; 510 } 511 } 512 513 ArgTys.push_back(ArgTy); 514 } 515 T = Context.getFunctionType(T, &ArgTys[0], ArgTys.size(), 516 FTI.isVariadic, FTI.TypeQuals); 517 } 518 break; 519 } 520 521 // See if there are any attributes on this declarator chunk. 522 if (const AttributeList *AL = DeclType.getAttrs()) 523 ProcessTypeAttributeList(T, AL); 524 } 525 526 if (getLangOptions().CPlusPlus && T->isFunctionType()) { 527 const FunctionTypeProto *FnTy = T->getAsFunctionTypeProto(); 528 assert(FnTy && "Why oh why is there not a FunctionTypeProto here ?"); 529 530 // C++ 8.3.5p4: A cv-qualifier-seq shall only be part of the function type 531 // for a nonstatic member function, the function type to which a pointer 532 // to member refers, or the top-level function type of a function typedef 533 // declaration. 534 if (FnTy->getTypeQuals() != 0 && 535 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef && 536 (D.getContext() != Declarator::MemberContext || 537 D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_static)) { 538 539 if (D.isFunctionDeclarator()) 540 Diag(D.getIdentifierLoc(), diag::err_invalid_qualified_function_type); 541 else 542 Diag(D.getIdentifierLoc(), 543 diag::err_invalid_qualified_typedef_function_type_use); 544 545 // Strip the cv-quals from the type. 546 T = Context.getFunctionType(FnTy->getResultType(), FnTy->arg_type_begin(), 547 FnTy->getNumArgs(), FnTy->isVariadic(), 0); 548 } 549 } 550 551 // If there were any type attributes applied to the decl itself (not the 552 // type, apply the type attribute to the type!) 553 if (const AttributeList *Attrs = D.getAttributes()) 554 ProcessTypeAttributeList(T, Attrs); 555 556 return T; 557} 558 559/// ObjCGetTypeForMethodDefinition - Builds the type for a method definition 560/// declarator 561QualType Sema::ObjCGetTypeForMethodDefinition(DeclTy *D) { 562 ObjCMethodDecl *MDecl = dyn_cast<ObjCMethodDecl>(static_cast<Decl *>(D)); 563 QualType T = MDecl->getResultType(); 564 llvm::SmallVector<QualType, 16> ArgTys; 565 566 // Add the first two invisible argument types for self and _cmd. 567 if (MDecl->isInstance()) { 568 QualType selfTy = Context.getObjCInterfaceType(MDecl->getClassInterface()); 569 selfTy = Context.getPointerType(selfTy); 570 ArgTys.push_back(selfTy); 571 } 572 else 573 ArgTys.push_back(Context.getObjCIdType()); 574 ArgTys.push_back(Context.getObjCSelType()); 575 576 for (int i = 0, e = MDecl->getNumParams(); i != e; ++i) { 577 ParmVarDecl *PDecl = MDecl->getParamDecl(i); 578 QualType ArgTy = PDecl->getType(); 579 assert(!ArgTy.isNull() && "Couldn't parse type?"); 580 // Perform the default function/array conversion (C99 6.7.5.3p[7,8]). 581 // This matches the conversion that is done in 582 // Sema::ActOnParamDeclarator(). 583 if (ArgTy->isArrayType()) 584 ArgTy = Context.getArrayDecayedType(ArgTy); 585 else if (ArgTy->isFunctionType()) 586 ArgTy = Context.getPointerType(ArgTy); 587 ArgTys.push_back(ArgTy); 588 } 589 T = Context.getFunctionType(T, &ArgTys[0], ArgTys.size(), 590 MDecl->isVariadic(), 0); 591 return T; 592} 593 594/// UnwrapSimilarPointerTypes - If T1 and T2 are pointer types (FIXME: 595/// or pointer-to-member types) that may be similar (C++ 4.4), 596/// replaces T1 and T2 with the type that they point to and return 597/// true. If T1 and T2 aren't pointer types or pointer-to-member 598/// types, or if they are not similar at this level, returns false and 599/// leaves T1 and T2 unchanged. Top-level qualifiers on T1 and T2 are 600/// ignored. This function will typically be called in a loop that 601/// successively "unwraps" pointer and pointer-to-member types to 602/// compare them at each level. 603bool Sema::UnwrapSimilarPointerTypes(QualType& T1, QualType& T2) 604{ 605 const PointerType *T1PtrType = T1->getAsPointerType(), 606 *T2PtrType = T2->getAsPointerType(); 607 if (T1PtrType && T2PtrType) { 608 T1 = T1PtrType->getPointeeType(); 609 T2 = T2PtrType->getPointeeType(); 610 return true; 611 } 612 613 // FIXME: pointer-to-member types 614 return false; 615} 616 617Sema::TypeResult Sema::ActOnTypeName(Scope *S, Declarator &D) { 618 // C99 6.7.6: Type names have no identifier. This is already validated by 619 // the parser. 620 assert(D.getIdentifier() == 0 && "Type name should have no identifier!"); 621 622 QualType T = GetTypeForDeclarator(D, S); 623 624 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 625 626 // Check that there are no default arguments (C++ only). 627 if (getLangOptions().CPlusPlus) 628 CheckExtraCXXDefaultArguments(D); 629 630 // In this context, we *do not* check D.getInvalidType(). If the declarator 631 // type was invalid, GetTypeForDeclarator() still returns a "valid" type, 632 // though it will not reflect the user specified type. 633 return T.getAsOpaquePtr(); 634} 635 636 637 638//===----------------------------------------------------------------------===// 639// Type Attribute Processing 640//===----------------------------------------------------------------------===// 641 642/// HandleAddressSpaceTypeAttribute - Process an address_space attribute on the 643/// specified type. The attribute contains 1 argument, the id of the address 644/// space for the type. 645static void HandleAddressSpaceTypeAttribute(QualType &Type, 646 const AttributeList &Attr, Sema &S){ 647 // If this type is already address space qualified, reject it. 648 // Clause 6.7.3 - Type qualifiers: "No type shall be qualified by qualifiers 649 // for two or more different address spaces." 650 if (Type.getAddressSpace()) { 651 S.Diag(Attr.getLoc(), diag::err_attribute_address_multiple_qualifiers); 652 return; 653 } 654 655 // Check the attribute arguments. 656 if (Attr.getNumArgs() != 1) { 657 S.Diag(Attr.getLoc(), diag::err_attribute_wrong_number_arguments) << 1; 658 return; 659 } 660 Expr *ASArgExpr = static_cast<Expr *>(Attr.getArg(0)); 661 llvm::APSInt addrSpace(32); 662 if (!ASArgExpr->isIntegerConstantExpr(addrSpace, S.Context)) { 663 S.Diag(Attr.getLoc(), diag::err_attribute_address_space_not_int) 664 << ASArgExpr->getSourceRange(); 665 return; 666 } 667 668 unsigned ASIdx = static_cast<unsigned>(addrSpace.getZExtValue()); 669 Type = S.Context.getASQualType(Type, ASIdx); 670} 671 672void Sema::ProcessTypeAttributeList(QualType &Result, const AttributeList *AL) { 673 // Scan through and apply attributes to this type where it makes sense. Some 674 // attributes (such as __address_space__, __vector_size__, etc) apply to the 675 // type, but others can be present in the type specifiers even though they 676 // apply to the decl. Here we apply type attributes and ignore the rest. 677 for (; AL; AL = AL->getNext()) { 678 // If this is an attribute we can handle, do so now, otherwise, add it to 679 // the LeftOverAttrs list for rechaining. 680 switch (AL->getKind()) { 681 default: break; 682 case AttributeList::AT_address_space: 683 HandleAddressSpaceTypeAttribute(Result, *AL, *this); 684 break; 685 } 686 } 687} 688 689 690