SemaDecl.cpp revision 7cdbc5832084f45721693dfb1d93284c3e08efee
1//===--- SemaDecl.cpp - Semantic Analysis for Declarations ----------------===// 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 semantic analysis for declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "Sema.h" 15#include "SemaInherit.h" 16#include "clang/AST/APValue.h" 17#include "clang/AST/ASTConsumer.h" 18#include "clang/AST/ASTContext.h" 19#include "clang/AST/DeclObjC.h" 20#include "clang/AST/DeclTemplate.h" 21#include "clang/AST/ExprCXX.h" 22#include "clang/AST/StmtCXX.h" 23#include "clang/Parse/DeclSpec.h" 24#include "clang/Basic/TargetInfo.h" 25#include "clang/Basic/SourceManager.h" 26// FIXME: layering (ideally, Sema shouldn't be dependent on Lex API's) 27#include "clang/Lex/Preprocessor.h" 28#include "clang/Lex/HeaderSearch.h" 29#include "llvm/ADT/SmallSet.h" 30#include "llvm/ADT/STLExtras.h" 31#include <algorithm> 32#include <functional> 33using namespace clang; 34 35/// getDeclName - Return a pretty name for the specified decl if possible, or 36/// an empty string if not. This is used for pretty crash reporting. 37std::string Sema::getDeclName(DeclPtrTy d) { 38 Decl *D = d.getAs<Decl>(); 39 if (NamedDecl *DN = dyn_cast_or_null<NamedDecl>(D)) 40 return DN->getQualifiedNameAsString(); 41 return ""; 42} 43 44Sema::DeclGroupPtrTy Sema::ConvertDeclToDeclGroup(DeclPtrTy Ptr) { 45 return DeclGroupPtrTy::make(DeclGroupRef(Ptr.getAs<Decl>())); 46} 47 48/// \brief If the identifier refers to a type name within this scope, 49/// return the declaration of that type. 50/// 51/// This routine performs ordinary name lookup of the identifier II 52/// within the given scope, with optional C++ scope specifier SS, to 53/// determine whether the name refers to a type. If so, returns an 54/// opaque pointer (actually a QualType) corresponding to that 55/// type. Otherwise, returns NULL. 56/// 57/// If name lookup results in an ambiguity, this routine will complain 58/// and then return NULL. 59Sema::TypeTy *Sema::getTypeName(IdentifierInfo &II, SourceLocation NameLoc, 60 Scope *S, const CXXScopeSpec *SS) { 61 // C++ [temp.res]p3: 62 // A qualified-id that refers to a type and in which the 63 // nested-name-specifier depends on a template-parameter (14.6.2) 64 // shall be prefixed by the keyword typename to indicate that the 65 // qualified-id denotes a type, forming an 66 // elaborated-type-specifier (7.1.5.3). 67 // 68 // We therefore do not perform any name lookup if the result would 69 // refer to a member of an unknown specialization. 70 if (SS && isUnknownSpecialization(*SS)) 71 return 0; 72 73 LookupResult Result 74 = LookupParsedName(S, SS, &II, LookupOrdinaryName, false, false); 75 76 NamedDecl *IIDecl = 0; 77 switch (Result.getKind()) { 78 case LookupResult::NotFound: 79 case LookupResult::FoundOverloaded: 80 return 0; 81 82 case LookupResult::AmbiguousBaseSubobjectTypes: 83 case LookupResult::AmbiguousBaseSubobjects: 84 case LookupResult::AmbiguousReference: { 85 // Look to see if we have a type anywhere in the list of results. 86 for (LookupResult::iterator Res = Result.begin(), ResEnd = Result.end(); 87 Res != ResEnd; ++Res) { 88 if (isa<TypeDecl>(*Res) || isa<ObjCInterfaceDecl>(*Res)) { 89 if (!IIDecl || 90 (*Res)->getLocation().getRawEncoding() < 91 IIDecl->getLocation().getRawEncoding()) 92 IIDecl = *Res; 93 } 94 } 95 96 if (!IIDecl) { 97 // None of the entities we found is a type, so there is no way 98 // to even assume that the result is a type. In this case, don't 99 // complain about the ambiguity. The parser will either try to 100 // perform this lookup again (e.g., as an object name), which 101 // will produce the ambiguity, or will complain that it expected 102 // a type name. 103 Result.Destroy(); 104 return 0; 105 } 106 107 // We found a type within the ambiguous lookup; diagnose the 108 // ambiguity and then return that type. This might be the right 109 // answer, or it might not be, but it suppresses any attempt to 110 // perform the name lookup again. 111 DiagnoseAmbiguousLookup(Result, DeclarationName(&II), NameLoc); 112 break; 113 } 114 115 case LookupResult::Found: 116 IIDecl = Result.getAsDecl(); 117 break; 118 } 119 120 if (IIDecl) { 121 QualType T; 122 123 if (TypeDecl *TD = dyn_cast<TypeDecl>(IIDecl)) { 124 // Check whether we can use this type 125 (void)DiagnoseUseOfDecl(IIDecl, NameLoc); 126 127 if (getLangOptions().CPlusPlus) { 128 // C++ [temp.local]p2: 129 // Within the scope of a class template specialization or 130 // partial specialization, when the injected-class-name is 131 // not followed by a <, it is equivalent to the 132 // injected-class-name followed by the template-argument s 133 // of the class template specialization or partial 134 // specialization enclosed in <>. 135 if (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(TD)) 136 if (RD->isInjectedClassName()) 137 if (ClassTemplateDecl *Template = RD->getDescribedClassTemplate()) 138 T = Template->getInjectedClassNameType(Context); 139 } 140 141 if (T.isNull()) 142 T = Context.getTypeDeclType(TD); 143 } else if (ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(IIDecl)) { 144 // Check whether we can use this interface. 145 (void)DiagnoseUseOfDecl(IIDecl, NameLoc); 146 147 T = Context.getObjCInterfaceType(IDecl); 148 } else 149 return 0; 150 151 if (SS) 152 T = getQualifiedNameType(*SS, T); 153 154 return T.getAsOpaquePtr(); 155 } 156 157 return 0; 158} 159 160/// isTagName() - This method is called *for error recovery purposes only* 161/// to determine if the specified name is a valid tag name ("struct foo"). If 162/// so, this returns the TST for the tag corresponding to it (TST_enum, 163/// TST_union, TST_struct, TST_class). This is used to diagnose cases in C 164/// where the user forgot to specify the tag. 165DeclSpec::TST Sema::isTagName(IdentifierInfo &II, Scope *S) { 166 // Do a tag name lookup in this scope. 167 LookupResult R = LookupName(S, &II, LookupTagName, false, false); 168 if (R.getKind() == LookupResult::Found) 169 if (const TagDecl *TD = dyn_cast<TagDecl>(R.getAsDecl())) { 170 switch (TD->getTagKind()) { 171 case TagDecl::TK_struct: return DeclSpec::TST_struct; 172 case TagDecl::TK_union: return DeclSpec::TST_union; 173 case TagDecl::TK_class: return DeclSpec::TST_class; 174 case TagDecl::TK_enum: return DeclSpec::TST_enum; 175 } 176 } 177 178 return DeclSpec::TST_unspecified; 179} 180 181 182 183DeclContext *Sema::getContainingDC(DeclContext *DC) { 184 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(DC)) { 185 // A C++ out-of-line method will return to the file declaration context. 186 if (MD->isOutOfLine()) 187 return MD->getLexicalDeclContext(); 188 189 // A C++ inline method is parsed *after* the topmost class it was declared 190 // in is fully parsed (it's "complete"). 191 // The parsing of a C++ inline method happens at the declaration context of 192 // the topmost (non-nested) class it is lexically declared in. 193 assert(isa<CXXRecordDecl>(MD->getParent()) && "C++ method not in Record."); 194 DC = MD->getParent(); 195 while (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC->getLexicalParent())) 196 DC = RD; 197 198 // Return the declaration context of the topmost class the inline method is 199 // declared in. 200 return DC; 201 } 202 203 if (isa<ObjCMethodDecl>(DC)) 204 return Context.getTranslationUnitDecl(); 205 206 return DC->getLexicalParent(); 207} 208 209void Sema::PushDeclContext(Scope *S, DeclContext *DC) { 210 assert(getContainingDC(DC) == CurContext && 211 "The next DeclContext should be lexically contained in the current one."); 212 CurContext = DC; 213 S->setEntity(DC); 214} 215 216void Sema::PopDeclContext() { 217 assert(CurContext && "DeclContext imbalance!"); 218 219 CurContext = getContainingDC(CurContext); 220} 221 222/// EnterDeclaratorContext - Used when we must lookup names in the context 223/// of a declarator's nested name specifier. 224void Sema::EnterDeclaratorContext(Scope *S, DeclContext *DC) { 225 assert(PreDeclaratorDC == 0 && "Previous declarator context not popped?"); 226 PreDeclaratorDC = static_cast<DeclContext*>(S->getEntity()); 227 CurContext = DC; 228 assert(CurContext && "No context?"); 229 S->setEntity(CurContext); 230} 231 232void Sema::ExitDeclaratorContext(Scope *S) { 233 S->setEntity(PreDeclaratorDC); 234 PreDeclaratorDC = 0; 235 236 // Reset CurContext to the nearest enclosing context. 237 while (!S->getEntity() && S->getParent()) 238 S = S->getParent(); 239 CurContext = static_cast<DeclContext*>(S->getEntity()); 240 assert(CurContext && "No context?"); 241} 242 243/// \brief Determine whether we allow overloading of the function 244/// PrevDecl with another declaration. 245/// 246/// This routine determines whether overloading is possible, not 247/// whether some new function is actually an overload. It will return 248/// true in C++ (where we can always provide overloads) or, as an 249/// extension, in C when the previous function is already an 250/// overloaded function declaration or has the "overloadable" 251/// attribute. 252static bool AllowOverloadingOfFunction(Decl *PrevDecl, ASTContext &Context) { 253 if (Context.getLangOptions().CPlusPlus) 254 return true; 255 256 if (isa<OverloadedFunctionDecl>(PrevDecl)) 257 return true; 258 259 return PrevDecl->getAttr<OverloadableAttr>() != 0; 260} 261 262/// Add this decl to the scope shadowed decl chains. 263void Sema::PushOnScopeChains(NamedDecl *D, Scope *S) { 264 // Move up the scope chain until we find the nearest enclosing 265 // non-transparent context. The declaration will be introduced into this 266 // scope. 267 while (S->getEntity() && 268 ((DeclContext *)S->getEntity())->isTransparentContext()) 269 S = S->getParent(); 270 271 S->AddDecl(DeclPtrTy::make(D)); 272 273 // Add scoped declarations into their context, so that they can be 274 // found later. Declarations without a context won't be inserted 275 // into any context. 276 CurContext->addDecl(D); 277 278 // C++ [basic.scope]p4: 279 // -- exactly one declaration shall declare a class name or 280 // enumeration name that is not a typedef name and the other 281 // declarations shall all refer to the same object or 282 // enumerator, or all refer to functions and function templates; 283 // in this case the class name or enumeration name is hidden. 284 if (TagDecl *TD = dyn_cast<TagDecl>(D)) { 285 // We are pushing the name of a tag (enum or class). 286 if (CurContext->getLookupContext() 287 == TD->getDeclContext()->getLookupContext()) { 288 // We're pushing the tag into the current context, which might 289 // require some reshuffling in the identifier resolver. 290 IdentifierResolver::iterator 291 I = IdResolver.begin(TD->getDeclName()), 292 IEnd = IdResolver.end(); 293 if (I != IEnd && isDeclInScope(*I, CurContext, S)) { 294 NamedDecl *PrevDecl = *I; 295 for (; I != IEnd && isDeclInScope(*I, CurContext, S); 296 PrevDecl = *I, ++I) { 297 if (TD->declarationReplaces(*I)) { 298 // This is a redeclaration. Remove it from the chain and 299 // break out, so that we'll add in the shadowed 300 // declaration. 301 S->RemoveDecl(DeclPtrTy::make(*I)); 302 if (PrevDecl == *I) { 303 IdResolver.RemoveDecl(*I); 304 IdResolver.AddDecl(TD); 305 return; 306 } else { 307 IdResolver.RemoveDecl(*I); 308 break; 309 } 310 } 311 } 312 313 // There is already a declaration with the same name in the same 314 // scope, which is not a tag declaration. It must be found 315 // before we find the new declaration, so insert the new 316 // declaration at the end of the chain. 317 IdResolver.AddShadowedDecl(TD, PrevDecl); 318 319 return; 320 } 321 } 322 } else if ((isa<FunctionDecl>(D) && 323 AllowOverloadingOfFunction(D, Context)) || 324 isa<FunctionTemplateDecl>(D)) { 325 // We are pushing the name of a function or function template, 326 // which might be an overloaded name. 327 IdentifierResolver::iterator Redecl 328 = std::find_if(IdResolver.begin(D->getDeclName()), 329 IdResolver.end(), 330 std::bind1st(std::mem_fun(&NamedDecl::declarationReplaces), 331 D)); 332 if (Redecl != IdResolver.end() && 333 S->isDeclScope(DeclPtrTy::make(*Redecl))) { 334 // There is already a declaration of a function on our 335 // IdResolver chain. Replace it with this declaration. 336 S->RemoveDecl(DeclPtrTy::make(*Redecl)); 337 IdResolver.RemoveDecl(*Redecl); 338 } 339 } else if (isa<ObjCInterfaceDecl>(D)) { 340 // We're pushing an Objective-C interface into the current 341 // context. If there is already an alias declaration, remove it first. 342 for (IdentifierResolver::iterator 343 I = IdResolver.begin(D->getDeclName()), IEnd = IdResolver.end(); 344 I != IEnd; ++I) { 345 if (isa<ObjCCompatibleAliasDecl>(*I)) { 346 S->RemoveDecl(DeclPtrTy::make(*I)); 347 IdResolver.RemoveDecl(*I); 348 break; 349 } 350 } 351 } 352 353 IdResolver.AddDecl(D); 354} 355 356void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) { 357 if (S->decl_empty()) return; 358 assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) && 359 "Scope shouldn't contain decls!"); 360 361 for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end(); 362 I != E; ++I) { 363 Decl *TmpD = (*I).getAs<Decl>(); 364 assert(TmpD && "This decl didn't get pushed??"); 365 366 assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?"); 367 NamedDecl *D = cast<NamedDecl>(TmpD); 368 369 if (!D->getDeclName()) continue; 370 371 // Remove this name from our lexical scope. 372 IdResolver.RemoveDecl(D); 373 } 374} 375 376/// getObjCInterfaceDecl - Look up a for a class declaration in the scope. 377/// return 0 if one not found. 378ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *Id) { 379 // The third "scope" argument is 0 since we aren't enabling lazy built-in 380 // creation from this context. 381 NamedDecl *IDecl = LookupName(TUScope, Id, LookupOrdinaryName); 382 383 return dyn_cast_or_null<ObjCInterfaceDecl>(IDecl); 384} 385 386/// getNonFieldDeclScope - Retrieves the innermost scope, starting 387/// from S, where a non-field would be declared. This routine copes 388/// with the difference between C and C++ scoping rules in structs and 389/// unions. For example, the following code is well-formed in C but 390/// ill-formed in C++: 391/// @code 392/// struct S6 { 393/// enum { BAR } e; 394/// }; 395/// 396/// void test_S6() { 397/// struct S6 a; 398/// a.e = BAR; 399/// } 400/// @endcode 401/// For the declaration of BAR, this routine will return a different 402/// scope. The scope S will be the scope of the unnamed enumeration 403/// within S6. In C++, this routine will return the scope associated 404/// with S6, because the enumeration's scope is a transparent 405/// context but structures can contain non-field names. In C, this 406/// routine will return the translation unit scope, since the 407/// enumeration's scope is a transparent context and structures cannot 408/// contain non-field names. 409Scope *Sema::getNonFieldDeclScope(Scope *S) { 410 while (((S->getFlags() & Scope::DeclScope) == 0) || 411 (S->getEntity() && 412 ((DeclContext *)S->getEntity())->isTransparentContext()) || 413 (S->isClassScope() && !getLangOptions().CPlusPlus)) 414 S = S->getParent(); 415 return S; 416} 417 418void Sema::InitBuiltinVaListType() { 419 if (!Context.getBuiltinVaListType().isNull()) 420 return; 421 422 IdentifierInfo *VaIdent = &Context.Idents.get("__builtin_va_list"); 423 NamedDecl *VaDecl = LookupName(TUScope, VaIdent, LookupOrdinaryName); 424 TypedefDecl *VaTypedef = cast<TypedefDecl>(VaDecl); 425 Context.setBuiltinVaListType(Context.getTypedefType(VaTypedef)); 426} 427 428/// LazilyCreateBuiltin - The specified Builtin-ID was first used at 429/// file scope. lazily create a decl for it. ForRedeclaration is true 430/// if we're creating this built-in in anticipation of redeclaring the 431/// built-in. 432NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid, 433 Scope *S, bool ForRedeclaration, 434 SourceLocation Loc) { 435 Builtin::ID BID = (Builtin::ID)bid; 436 437 if (Context.BuiltinInfo.hasVAListUse(BID)) 438 InitBuiltinVaListType(); 439 440 ASTContext::GetBuiltinTypeError Error; 441 QualType R = Context.GetBuiltinType(BID, Error); 442 switch (Error) { 443 case ASTContext::GE_None: 444 // Okay 445 break; 446 447 case ASTContext::GE_Missing_FILE: 448 if (ForRedeclaration) 449 Diag(Loc, diag::err_implicit_decl_requires_stdio) 450 << Context.BuiltinInfo.GetName(BID); 451 return 0; 452 } 453 454 if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) { 455 Diag(Loc, diag::ext_implicit_lib_function_decl) 456 << Context.BuiltinInfo.GetName(BID) 457 << R; 458 if (Context.BuiltinInfo.getHeaderName(BID) && 459 Diags.getDiagnosticLevel(diag::ext_implicit_lib_function_decl) 460 != Diagnostic::Ignored) 461 Diag(Loc, diag::note_please_include_header) 462 << Context.BuiltinInfo.getHeaderName(BID) 463 << Context.BuiltinInfo.GetName(BID); 464 } 465 466 FunctionDecl *New = FunctionDecl::Create(Context, 467 Context.getTranslationUnitDecl(), 468 Loc, II, R, 469 FunctionDecl::Extern, false, 470 /*hasPrototype=*/true); 471 New->setImplicit(); 472 473 // Create Decl objects for each parameter, adding them to the 474 // FunctionDecl. 475 if (FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) { 476 llvm::SmallVector<ParmVarDecl*, 16> Params; 477 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) 478 Params.push_back(ParmVarDecl::Create(Context, New, SourceLocation(), 0, 479 FT->getArgType(i), VarDecl::None, 0)); 480 New->setParams(Context, Params.data(), Params.size()); 481 } 482 483 AddKnownFunctionAttributes(New); 484 485 // TUScope is the translation-unit scope to insert this function into. 486 // FIXME: This is hideous. We need to teach PushOnScopeChains to 487 // relate Scopes to DeclContexts, and probably eliminate CurContext 488 // entirely, but we're not there yet. 489 DeclContext *SavedContext = CurContext; 490 CurContext = Context.getTranslationUnitDecl(); 491 PushOnScopeChains(New, TUScope); 492 CurContext = SavedContext; 493 return New; 494} 495 496/// GetStdNamespace - This method gets the C++ "std" namespace. This is where 497/// everything from the standard library is defined. 498NamespaceDecl *Sema::GetStdNamespace() { 499 if (!StdNamespace) { 500 IdentifierInfo *StdIdent = &PP.getIdentifierTable().get("std"); 501 DeclContext *Global = Context.getTranslationUnitDecl(); 502 Decl *Std = LookupQualifiedName(Global, StdIdent, LookupNamespaceName); 503 StdNamespace = dyn_cast_or_null<NamespaceDecl>(Std); 504 } 505 return StdNamespace; 506} 507 508/// MergeTypeDefDecl - We just parsed a typedef 'New' which has the 509/// same name and scope as a previous declaration 'Old'. Figure out 510/// how to resolve this situation, merging decls or emitting 511/// diagnostics as appropriate. If there was an error, set New to be invalid. 512/// 513void Sema::MergeTypeDefDecl(TypedefDecl *New, Decl *OldD) { 514 // If either decl is known invalid already, set the new one to be invalid and 515 // don't bother doing any merging checks. 516 if (New->isInvalidDecl() || OldD->isInvalidDecl()) 517 return New->setInvalidDecl(); 518 519 // Allow multiple definitions for ObjC built-in typedefs. 520 // FIXME: Verify the underlying types are equivalent! 521 if (getLangOptions().ObjC1) { 522 const IdentifierInfo *TypeID = New->getIdentifier(); 523 switch (TypeID->getLength()) { 524 default: break; 525 case 2: 526 if (!TypeID->isStr("id")) 527 break; 528 // Install the built-in type for 'id', ignoring the current definition. 529 New->setTypeForDecl(Context.getObjCIdType().getTypePtr()); 530 return; 531 case 5: 532 if (!TypeID->isStr("Class")) 533 break; 534 // Install the built-in type for 'Class', ignoring the current definition. 535 New->setTypeForDecl(Context.getObjCClassType().getTypePtr()); 536 return; 537 case 3: 538 if (!TypeID->isStr("SEL")) 539 break; 540 Context.setObjCSelType(Context.getTypeDeclType(New)); 541 return; 542 case 8: 543 if (!TypeID->isStr("Protocol")) 544 break; 545 Context.setObjCProtoType(New->getUnderlyingType()); 546 return; 547 } 548 // Fall through - the typedef name was not a builtin type. 549 } 550 // Verify the old decl was also a type. 551 TypeDecl *Old = dyn_cast<TypeDecl>(OldD); 552 if (!Old) { 553 Diag(New->getLocation(), diag::err_redefinition_different_kind) 554 << New->getDeclName(); 555 if (OldD->getLocation().isValid()) 556 Diag(OldD->getLocation(), diag::note_previous_definition); 557 return New->setInvalidDecl(); 558 } 559 560 // Determine the "old" type we'll use for checking and diagnostics. 561 QualType OldType; 562 if (TypedefDecl *OldTypedef = dyn_cast<TypedefDecl>(Old)) 563 OldType = OldTypedef->getUnderlyingType(); 564 else 565 OldType = Context.getTypeDeclType(Old); 566 567 // If the typedef types are not identical, reject them in all languages and 568 // with any extensions enabled. 569 570 if (OldType != New->getUnderlyingType() && 571 Context.getCanonicalType(OldType) != 572 Context.getCanonicalType(New->getUnderlyingType())) { 573 Diag(New->getLocation(), diag::err_redefinition_different_typedef) 574 << New->getUnderlyingType() << OldType; 575 if (Old->getLocation().isValid()) 576 Diag(Old->getLocation(), diag::note_previous_definition); 577 return New->setInvalidDecl(); 578 } 579 580 if (getLangOptions().Microsoft) 581 return; 582 583 // C++ [dcl.typedef]p2: 584 // In a given non-class scope, a typedef specifier can be used to 585 // redefine the name of any type declared in that scope to refer 586 // to the type to which it already refers. 587 if (getLangOptions().CPlusPlus) { 588 if (!isa<CXXRecordDecl>(CurContext)) 589 return; 590 Diag(New->getLocation(), diag::err_redefinition) 591 << New->getDeclName(); 592 Diag(Old->getLocation(), diag::note_previous_definition); 593 return New->setInvalidDecl(); 594 } 595 596 // If we have a redefinition of a typedef in C, emit a warning. This warning 597 // is normally mapped to an error, but can be controlled with 598 // -Wtypedef-redefinition. If either the original or the redefinition is 599 // in a system header, don't emit this for compatibility with GCC. 600 if (PP.getDiagnostics().getSuppressSystemWarnings() && 601 (Context.getSourceManager().isInSystemHeader(Old->getLocation()) || 602 Context.getSourceManager().isInSystemHeader(New->getLocation()))) 603 return; 604 605 Diag(New->getLocation(), diag::warn_redefinition_of_typedef) 606 << New->getDeclName(); 607 Diag(Old->getLocation(), diag::note_previous_definition); 608 return; 609} 610 611/// DeclhasAttr - returns true if decl Declaration already has the target 612/// attribute. 613static bool 614DeclHasAttr(const Decl *decl, const Attr *target) { 615 for (const Attr *attr = decl->getAttrs(); attr; attr = attr->getNext()) 616 if (attr->getKind() == target->getKind()) 617 return true; 618 619 return false; 620} 621 622/// MergeAttributes - append attributes from the Old decl to the New one. 623static void MergeAttributes(Decl *New, Decl *Old, ASTContext &C) { 624 for (const Attr *attr = Old->getAttrs(); attr; attr = attr->getNext()) { 625 if (!DeclHasAttr(New, attr) && attr->isMerged()) { 626 Attr *NewAttr = attr->clone(C); 627 NewAttr->setInherited(true); 628 New->addAttr(NewAttr); 629 } 630 } 631} 632 633/// Used in MergeFunctionDecl to keep track of function parameters in 634/// C. 635struct GNUCompatibleParamWarning { 636 ParmVarDecl *OldParm; 637 ParmVarDecl *NewParm; 638 QualType PromotedType; 639}; 640 641/// MergeFunctionDecl - We just parsed a function 'New' from 642/// declarator D which has the same name and scope as a previous 643/// declaration 'Old'. Figure out how to resolve this situation, 644/// merging decls or emitting diagnostics as appropriate. 645/// 646/// In C++, New and Old must be declarations that are not 647/// overloaded. Use IsOverload to determine whether New and Old are 648/// overloaded, and to select the Old declaration that New should be 649/// merged with. 650/// 651/// Returns true if there was an error, false otherwise. 652bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD) { 653 assert(!isa<OverloadedFunctionDecl>(OldD) && 654 "Cannot merge with an overloaded function declaration"); 655 656 // Verify the old decl was also a function. 657 FunctionDecl *Old = 0; 658 if (FunctionTemplateDecl *OldFunctionTemplate 659 = dyn_cast<FunctionTemplateDecl>(OldD)) 660 Old = OldFunctionTemplate->getTemplatedDecl(); 661 else 662 Old = dyn_cast<FunctionDecl>(OldD); 663 if (!Old) { 664 Diag(New->getLocation(), diag::err_redefinition_different_kind) 665 << New->getDeclName(); 666 Diag(OldD->getLocation(), diag::note_previous_definition); 667 return true; 668 } 669 670 // Determine whether the previous declaration was a definition, 671 // implicit declaration, or a declaration. 672 diag::kind PrevDiag; 673 if (Old->isThisDeclarationADefinition()) 674 PrevDiag = diag::note_previous_definition; 675 else if (Old->isImplicit()) 676 PrevDiag = diag::note_previous_implicit_declaration; 677 else 678 PrevDiag = diag::note_previous_declaration; 679 680 QualType OldQType = Context.getCanonicalType(Old->getType()); 681 QualType NewQType = Context.getCanonicalType(New->getType()); 682 683 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) && 684 New->getStorageClass() == FunctionDecl::Static && 685 Old->getStorageClass() != FunctionDecl::Static) { 686 Diag(New->getLocation(), diag::err_static_non_static) 687 << New; 688 Diag(Old->getLocation(), PrevDiag); 689 return true; 690 } 691 692 if (getLangOptions().CPlusPlus) { 693 // (C++98 13.1p2): 694 // Certain function declarations cannot be overloaded: 695 // -- Function declarations that differ only in the return type 696 // cannot be overloaded. 697 QualType OldReturnType 698 = cast<FunctionType>(OldQType.getTypePtr())->getResultType(); 699 QualType NewReturnType 700 = cast<FunctionType>(NewQType.getTypePtr())->getResultType(); 701 if (OldReturnType != NewReturnType) { 702 Diag(New->getLocation(), diag::err_ovl_diff_return_type); 703 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 704 return true; 705 } 706 707 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 708 const CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 709 if (OldMethod && NewMethod && 710 NewMethod->getLexicalDeclContext()->isRecord()) { 711 // -- Member function declarations with the same name and the 712 // same parameter types cannot be overloaded if any of them 713 // is a static member function declaration. 714 if (OldMethod->isStatic() || NewMethod->isStatic()) { 715 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 716 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 717 return true; 718 } 719 720 // C++ [class.mem]p1: 721 // [...] A member shall not be declared twice in the 722 // member-specification, except that a nested class or member 723 // class template can be declared and then later defined. 724 unsigned NewDiag; 725 if (isa<CXXConstructorDecl>(OldMethod)) 726 NewDiag = diag::err_constructor_redeclared; 727 else if (isa<CXXDestructorDecl>(NewMethod)) 728 NewDiag = diag::err_destructor_redeclared; 729 else if (isa<CXXConversionDecl>(NewMethod)) 730 NewDiag = diag::err_conv_function_redeclared; 731 else 732 NewDiag = diag::err_member_redeclared; 733 734 Diag(New->getLocation(), NewDiag); 735 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 736 } 737 738 // (C++98 8.3.5p3): 739 // All declarations for a function shall agree exactly in both the 740 // return type and the parameter-type-list. 741 if (OldQType == NewQType) 742 return MergeCompatibleFunctionDecls(New, Old); 743 744 // Fall through for conflicting redeclarations and redefinitions. 745 } 746 747 // C: Function types need to be compatible, not identical. This handles 748 // duplicate function decls like "void f(int); void f(enum X);" properly. 749 if (!getLangOptions().CPlusPlus && 750 Context.typesAreCompatible(OldQType, NewQType)) { 751 const FunctionType *OldFuncType = OldQType->getAsFunctionType(); 752 const FunctionType *NewFuncType = NewQType->getAsFunctionType(); 753 const FunctionProtoType *OldProto = 0; 754 if (isa<FunctionNoProtoType>(NewFuncType) && 755 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) { 756 // The old declaration provided a function prototype, but the 757 // new declaration does not. Merge in the prototype. 758 assert(!OldProto->hasExceptionSpec() && "Exception spec in C"); 759 llvm::SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(), 760 OldProto->arg_type_end()); 761 NewQType = Context.getFunctionType(NewFuncType->getResultType(), 762 ParamTypes.data(), ParamTypes.size(), 763 OldProto->isVariadic(), 764 OldProto->getTypeQuals()); 765 New->setType(NewQType); 766 New->setHasInheritedPrototype(); 767 768 // Synthesize a parameter for each argument type. 769 llvm::SmallVector<ParmVarDecl*, 16> Params; 770 for (FunctionProtoType::arg_type_iterator 771 ParamType = OldProto->arg_type_begin(), 772 ParamEnd = OldProto->arg_type_end(); 773 ParamType != ParamEnd; ++ParamType) { 774 ParmVarDecl *Param = ParmVarDecl::Create(Context, New, 775 SourceLocation(), 0, 776 *ParamType, VarDecl::None, 777 0); 778 Param->setImplicit(); 779 Params.push_back(Param); 780 } 781 782 New->setParams(Context, Params.data(), Params.size()); 783 } 784 785 return MergeCompatibleFunctionDecls(New, Old); 786 } 787 788 // GNU C permits a K&R definition to follow a prototype declaration 789 // if the declared types of the parameters in the K&R definition 790 // match the types in the prototype declaration, even when the 791 // promoted types of the parameters from the K&R definition differ 792 // from the types in the prototype. GCC then keeps the types from 793 // the prototype. 794 // 795 // If a variadic prototype is followed by a non-variadic K&R definition, 796 // the K&R definition becomes variadic. This is sort of an edge case, but 797 // it's legal per the standard depending on how you read C99 6.7.5.3p15 and 798 // C99 6.9.1p8. 799 if (!getLangOptions().CPlusPlus && 800 Old->hasPrototype() && !New->hasPrototype() && 801 New->getType()->getAsFunctionProtoType() && 802 Old->getNumParams() == New->getNumParams()) { 803 llvm::SmallVector<QualType, 16> ArgTypes; 804 llvm::SmallVector<GNUCompatibleParamWarning, 16> Warnings; 805 const FunctionProtoType *OldProto 806 = Old->getType()->getAsFunctionProtoType(); 807 const FunctionProtoType *NewProto 808 = New->getType()->getAsFunctionProtoType(); 809 810 // Determine whether this is the GNU C extension. 811 QualType MergedReturn = Context.mergeTypes(OldProto->getResultType(), 812 NewProto->getResultType()); 813 bool LooseCompatible = !MergedReturn.isNull(); 814 for (unsigned Idx = 0, End = Old->getNumParams(); 815 LooseCompatible && Idx != End; ++Idx) { 816 ParmVarDecl *OldParm = Old->getParamDecl(Idx); 817 ParmVarDecl *NewParm = New->getParamDecl(Idx); 818 if (Context.typesAreCompatible(OldParm->getType(), 819 NewProto->getArgType(Idx))) { 820 ArgTypes.push_back(NewParm->getType()); 821 } else if (Context.typesAreCompatible(OldParm->getType(), 822 NewParm->getType())) { 823 GNUCompatibleParamWarning Warn 824 = { OldParm, NewParm, NewProto->getArgType(Idx) }; 825 Warnings.push_back(Warn); 826 ArgTypes.push_back(NewParm->getType()); 827 } else 828 LooseCompatible = false; 829 } 830 831 if (LooseCompatible) { 832 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) { 833 Diag(Warnings[Warn].NewParm->getLocation(), 834 diag::ext_param_promoted_not_compatible_with_prototype) 835 << Warnings[Warn].PromotedType 836 << Warnings[Warn].OldParm->getType(); 837 Diag(Warnings[Warn].OldParm->getLocation(), 838 diag::note_previous_declaration); 839 } 840 841 New->setType(Context.getFunctionType(MergedReturn, &ArgTypes[0], 842 ArgTypes.size(), 843 OldProto->isVariadic(), 0)); 844 return MergeCompatibleFunctionDecls(New, Old); 845 } 846 847 // Fall through to diagnose conflicting types. 848 } 849 850 // A function that has already been declared has been redeclared or defined 851 // with a different type- show appropriate diagnostic 852 if (unsigned BuiltinID = Old->getBuiltinID(Context)) { 853 // The user has declared a builtin function with an incompatible 854 // signature. 855 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 856 // The function the user is redeclaring is a library-defined 857 // function like 'malloc' or 'printf'. Warn about the 858 // redeclaration, then pretend that we don't know about this 859 // library built-in. 860 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; 861 Diag(Old->getLocation(), diag::note_previous_builtin_declaration) 862 << Old << Old->getType(); 863 New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin); 864 Old->setInvalidDecl(); 865 return false; 866 } 867 868 PrevDiag = diag::note_previous_builtin_declaration; 869 } 870 871 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 872 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 873 return true; 874} 875 876/// \brief Completes the merge of two function declarations that are 877/// known to be compatible. 878/// 879/// This routine handles the merging of attributes and other 880/// properties of function declarations form the old declaration to 881/// the new declaration, once we know that New is in fact a 882/// redeclaration of Old. 883/// 884/// \returns false 885bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old) { 886 // Merge the attributes 887 MergeAttributes(New, Old, Context); 888 889 // Merge the storage class. 890 if (Old->getStorageClass() != FunctionDecl::Extern) 891 New->setStorageClass(Old->getStorageClass()); 892 893 // Merge "inline" 894 if (Old->isInline()) 895 New->setInline(true); 896 897 // If this function declaration by itself qualifies as a C99 inline 898 // definition (C99 6.7.4p6), but the previous definition did not, 899 // then the function is not a C99 inline definition. 900 if (New->isC99InlineDefinition() && !Old->isC99InlineDefinition()) 901 New->setC99InlineDefinition(false); 902 else if (Old->isC99InlineDefinition() && !New->isC99InlineDefinition()) { 903 // Mark all preceding definitions as not being C99 inline definitions. 904 for (const FunctionDecl *Prev = Old; Prev; 905 Prev = Prev->getPreviousDeclaration()) 906 const_cast<FunctionDecl *>(Prev)->setC99InlineDefinition(false); 907 } 908 909 // Merge "pure" flag. 910 if (Old->isPure()) 911 New->setPure(); 912 913 // Merge the "deleted" flag. 914 if (Old->isDeleted()) 915 New->setDeleted(); 916 917 if (getLangOptions().CPlusPlus) 918 return MergeCXXFunctionDecl(New, Old); 919 920 return false; 921} 922 923/// MergeVarDecl - We just parsed a variable 'New' which has the same name 924/// and scope as a previous declaration 'Old'. Figure out how to resolve this 925/// situation, merging decls or emitting diagnostics as appropriate. 926/// 927/// Tentative definition rules (C99 6.9.2p2) are checked by 928/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 929/// definitions here, since the initializer hasn't been attached. 930/// 931void Sema::MergeVarDecl(VarDecl *New, Decl *OldD) { 932 // If either decl is invalid, make sure the new one is marked invalid and 933 // don't do any other checking. 934 if (New->isInvalidDecl() || OldD->isInvalidDecl()) 935 return New->setInvalidDecl(); 936 937 // Verify the old decl was also a variable. 938 VarDecl *Old = dyn_cast<VarDecl>(OldD); 939 if (!Old) { 940 Diag(New->getLocation(), diag::err_redefinition_different_kind) 941 << New->getDeclName(); 942 Diag(OldD->getLocation(), diag::note_previous_definition); 943 return New->setInvalidDecl(); 944 } 945 946 MergeAttributes(New, Old, Context); 947 948 // Merge the types 949 QualType MergedT; 950 if (getLangOptions().CPlusPlus) { 951 if (Context.hasSameType(New->getType(), Old->getType())) 952 MergedT = New->getType(); 953 } else { 954 MergedT = Context.mergeTypes(New->getType(), Old->getType()); 955 } 956 if (MergedT.isNull()) { 957 Diag(New->getLocation(), diag::err_redefinition_different_type) 958 << New->getDeclName(); 959 Diag(Old->getLocation(), diag::note_previous_definition); 960 return New->setInvalidDecl(); 961 } 962 New->setType(MergedT); 963 964 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 965 if (New->getStorageClass() == VarDecl::Static && 966 (Old->getStorageClass() == VarDecl::None || Old->hasExternalStorage())) { 967 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 968 Diag(Old->getLocation(), diag::note_previous_definition); 969 return New->setInvalidDecl(); 970 } 971 // C99 6.2.2p4: 972 // For an identifier declared with the storage-class specifier 973 // extern in a scope in which a prior declaration of that 974 // identifier is visible,23) if the prior declaration specifies 975 // internal or external linkage, the linkage of the identifier at 976 // the later declaration is the same as the linkage specified at 977 // the prior declaration. If no prior declaration is visible, or 978 // if the prior declaration specifies no linkage, then the 979 // identifier has external linkage. 980 if (New->hasExternalStorage() && Old->hasLinkage()) 981 /* Okay */; 982 else if (New->getStorageClass() != VarDecl::Static && 983 Old->getStorageClass() == VarDecl::Static) { 984 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 985 Diag(Old->getLocation(), diag::note_previous_definition); 986 return New->setInvalidDecl(); 987 } 988 989 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 990 991 // FIXME: The test for external storage here seems wrong? We still 992 // need to check for mismatches. 993 if (!New->hasExternalStorage() && !New->isFileVarDecl() && 994 // Don't complain about out-of-line definitions of static members. 995 !(Old->getLexicalDeclContext()->isRecord() && 996 !New->getLexicalDeclContext()->isRecord())) { 997 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 998 Diag(Old->getLocation(), diag::note_previous_definition); 999 return New->setInvalidDecl(); 1000 } 1001 1002 if (New->isThreadSpecified() && !Old->isThreadSpecified()) { 1003 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName(); 1004 Diag(Old->getLocation(), diag::note_previous_definition); 1005 } else if (!New->isThreadSpecified() && Old->isThreadSpecified()) { 1006 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName(); 1007 Diag(Old->getLocation(), diag::note_previous_definition); 1008 } 1009 1010 // Keep a chain of previous declarations. 1011 New->setPreviousDeclaration(Old); 1012} 1013 1014/// CheckParmsForFunctionDef - Check that the parameters of the given 1015/// function are appropriate for the definition of a function. This 1016/// takes care of any checks that cannot be performed on the 1017/// declaration itself, e.g., that the types of each of the function 1018/// parameters are complete. 1019bool Sema::CheckParmsForFunctionDef(FunctionDecl *FD) { 1020 bool HasInvalidParm = false; 1021 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 1022 ParmVarDecl *Param = FD->getParamDecl(p); 1023 1024 // C99 6.7.5.3p4: the parameters in a parameter type list in a 1025 // function declarator that is part of a function definition of 1026 // that function shall not have incomplete type. 1027 // 1028 // This is also C++ [dcl.fct]p6. 1029 if (!Param->isInvalidDecl() && 1030 RequireCompleteType(Param->getLocation(), Param->getType(), 1031 diag::err_typecheck_decl_incomplete_type)) { 1032 Param->setInvalidDecl(); 1033 HasInvalidParm = true; 1034 } 1035 1036 // C99 6.9.1p5: If the declarator includes a parameter type list, the 1037 // declaration of each parameter shall include an identifier. 1038 if (Param->getIdentifier() == 0 && 1039 !Param->isImplicit() && 1040 !getLangOptions().CPlusPlus) 1041 Diag(Param->getLocation(), diag::err_parameter_name_omitted); 1042 } 1043 1044 return HasInvalidParm; 1045} 1046 1047/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 1048/// no declarator (e.g. "struct foo;") is parsed. 1049Sema::DeclPtrTy Sema::ParsedFreeStandingDeclSpec(Scope *S, DeclSpec &DS) { 1050 // FIXME: Error on auto/register at file scope 1051 // FIXME: Error on inline/virtual/explicit 1052 // FIXME: Error on invalid restrict 1053 // FIXME: Warn on useless __thread 1054 // FIXME: Warn on useless const/volatile 1055 // FIXME: Warn on useless static/extern/typedef/private_extern/mutable 1056 // FIXME: Warn on useless attributes 1057 TagDecl *Tag = 0; 1058 if (DS.getTypeSpecType() == DeclSpec::TST_class || 1059 DS.getTypeSpecType() == DeclSpec::TST_struct || 1060 DS.getTypeSpecType() == DeclSpec::TST_union || 1061 DS.getTypeSpecType() == DeclSpec::TST_enum) { 1062 if (!DS.getTypeRep()) // We probably had an error 1063 return DeclPtrTy(); 1064 1065 Tag = dyn_cast<TagDecl>(static_cast<Decl *>(DS.getTypeRep())); 1066 } 1067 1068 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 1069 if (!Record->getDeclName() && Record->isDefinition() && 1070 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { 1071 if (getLangOptions().CPlusPlus || 1072 Record->getDeclContext()->isRecord()) 1073 return BuildAnonymousStructOrUnion(S, DS, Record); 1074 1075 Diag(DS.getSourceRange().getBegin(), diag::err_no_declarators) 1076 << DS.getSourceRange(); 1077 } 1078 1079 // Microsoft allows unnamed struct/union fields. Don't complain 1080 // about them. 1081 // FIXME: Should we support Microsoft's extensions in this area? 1082 if (Record->getDeclName() && getLangOptions().Microsoft) 1083 return DeclPtrTy::make(Tag); 1084 } 1085 1086 if (!DS.isMissingDeclaratorOk() && 1087 DS.getTypeSpecType() != DeclSpec::TST_error) { 1088 // Warn about typedefs of enums without names, since this is an 1089 // extension in both Microsoft an GNU. 1090 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 1091 Tag && isa<EnumDecl>(Tag)) { 1092 Diag(DS.getSourceRange().getBegin(), diag::ext_typedef_without_a_name) 1093 << DS.getSourceRange(); 1094 return DeclPtrTy::make(Tag); 1095 } 1096 1097 Diag(DS.getSourceRange().getBegin(), diag::err_no_declarators) 1098 << DS.getSourceRange(); 1099 return DeclPtrTy(); 1100 } 1101 1102 return DeclPtrTy::make(Tag); 1103} 1104 1105/// InjectAnonymousStructOrUnionMembers - Inject the members of the 1106/// anonymous struct or union AnonRecord into the owning context Owner 1107/// and scope S. This routine will be invoked just after we realize 1108/// that an unnamed union or struct is actually an anonymous union or 1109/// struct, e.g., 1110/// 1111/// @code 1112/// union { 1113/// int i; 1114/// float f; 1115/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 1116/// // f into the surrounding scope.x 1117/// @endcode 1118/// 1119/// This routine is recursive, injecting the names of nested anonymous 1120/// structs/unions into the owning context and scope as well. 1121bool Sema::InjectAnonymousStructOrUnionMembers(Scope *S, DeclContext *Owner, 1122 RecordDecl *AnonRecord) { 1123 bool Invalid = false; 1124 for (RecordDecl::field_iterator F = AnonRecord->field_begin(), 1125 FEnd = AnonRecord->field_end(); 1126 F != FEnd; ++F) { 1127 if ((*F)->getDeclName()) { 1128 NamedDecl *PrevDecl = LookupQualifiedName(Owner, (*F)->getDeclName(), 1129 LookupOrdinaryName, true); 1130 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 1131 // C++ [class.union]p2: 1132 // The names of the members of an anonymous union shall be 1133 // distinct from the names of any other entity in the 1134 // scope in which the anonymous union is declared. 1135 unsigned diagKind 1136 = AnonRecord->isUnion()? diag::err_anonymous_union_member_redecl 1137 : diag::err_anonymous_struct_member_redecl; 1138 Diag((*F)->getLocation(), diagKind) 1139 << (*F)->getDeclName(); 1140 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 1141 Invalid = true; 1142 } else { 1143 // C++ [class.union]p2: 1144 // For the purpose of name lookup, after the anonymous union 1145 // definition, the members of the anonymous union are 1146 // considered to have been defined in the scope in which the 1147 // anonymous union is declared. 1148 Owner->makeDeclVisibleInContext(*F); 1149 S->AddDecl(DeclPtrTy::make(*F)); 1150 IdResolver.AddDecl(*F); 1151 } 1152 } else if (const RecordType *InnerRecordType 1153 = (*F)->getType()->getAsRecordType()) { 1154 RecordDecl *InnerRecord = InnerRecordType->getDecl(); 1155 if (InnerRecord->isAnonymousStructOrUnion()) 1156 Invalid = Invalid || 1157 InjectAnonymousStructOrUnionMembers(S, Owner, InnerRecord); 1158 } 1159 } 1160 1161 return Invalid; 1162} 1163 1164/// ActOnAnonymousStructOrUnion - Handle the declaration of an 1165/// anonymous structure or union. Anonymous unions are a C++ feature 1166/// (C++ [class.union]) and a GNU C extension; anonymous structures 1167/// are a GNU C and GNU C++ extension. 1168Sema::DeclPtrTy Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 1169 RecordDecl *Record) { 1170 DeclContext *Owner = Record->getDeclContext(); 1171 1172 // Diagnose whether this anonymous struct/union is an extension. 1173 if (Record->isUnion() && !getLangOptions().CPlusPlus) 1174 Diag(Record->getLocation(), diag::ext_anonymous_union); 1175 else if (!Record->isUnion()) 1176 Diag(Record->getLocation(), diag::ext_anonymous_struct); 1177 1178 // C and C++ require different kinds of checks for anonymous 1179 // structs/unions. 1180 bool Invalid = false; 1181 if (getLangOptions().CPlusPlus) { 1182 const char* PrevSpec = 0; 1183 // C++ [class.union]p3: 1184 // Anonymous unions declared in a named namespace or in the 1185 // global namespace shall be declared static. 1186 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 1187 (isa<TranslationUnitDecl>(Owner) || 1188 (isa<NamespaceDecl>(Owner) && 1189 cast<NamespaceDecl>(Owner)->getDeclName()))) { 1190 Diag(Record->getLocation(), diag::err_anonymous_union_not_static); 1191 Invalid = true; 1192 1193 // Recover by adding 'static'. 1194 DS.SetStorageClassSpec(DeclSpec::SCS_static, SourceLocation(), PrevSpec); 1195 } 1196 // C++ [class.union]p3: 1197 // A storage class is not allowed in a declaration of an 1198 // anonymous union in a class scope. 1199 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 1200 isa<RecordDecl>(Owner)) { 1201 Diag(DS.getStorageClassSpecLoc(), 1202 diag::err_anonymous_union_with_storage_spec); 1203 Invalid = true; 1204 1205 // Recover by removing the storage specifier. 1206 DS.SetStorageClassSpec(DeclSpec::SCS_unspecified, SourceLocation(), 1207 PrevSpec); 1208 } 1209 1210 // C++ [class.union]p2: 1211 // The member-specification of an anonymous union shall only 1212 // define non-static data members. [Note: nested types and 1213 // functions cannot be declared within an anonymous union. ] 1214 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 1215 MemEnd = Record->decls_end(); 1216 Mem != MemEnd; ++Mem) { 1217 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 1218 // C++ [class.union]p3: 1219 // An anonymous union shall not have private or protected 1220 // members (clause 11). 1221 if (FD->getAccess() == AS_protected || FD->getAccess() == AS_private) { 1222 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 1223 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 1224 Invalid = true; 1225 } 1226 } else if ((*Mem)->isImplicit()) { 1227 // Any implicit members are fine. 1228 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 1229 // This is a type that showed up in an 1230 // elaborated-type-specifier inside the anonymous struct or 1231 // union, but which actually declares a type outside of the 1232 // anonymous struct or union. It's okay. 1233 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 1234 if (!MemRecord->isAnonymousStructOrUnion() && 1235 MemRecord->getDeclName()) { 1236 // This is a nested type declaration. 1237 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 1238 << (int)Record->isUnion(); 1239 Invalid = true; 1240 } 1241 } else { 1242 // We have something that isn't a non-static data 1243 // member. Complain about it. 1244 unsigned DK = diag::err_anonymous_record_bad_member; 1245 if (isa<TypeDecl>(*Mem)) 1246 DK = diag::err_anonymous_record_with_type; 1247 else if (isa<FunctionDecl>(*Mem)) 1248 DK = diag::err_anonymous_record_with_function; 1249 else if (isa<VarDecl>(*Mem)) 1250 DK = diag::err_anonymous_record_with_static; 1251 Diag((*Mem)->getLocation(), DK) 1252 << (int)Record->isUnion(); 1253 Invalid = true; 1254 } 1255 } 1256 } 1257 1258 if (!Record->isUnion() && !Owner->isRecord()) { 1259 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 1260 << (int)getLangOptions().CPlusPlus; 1261 Invalid = true; 1262 } 1263 1264 // Create a declaration for this anonymous struct/union. 1265 NamedDecl *Anon = 0; 1266 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 1267 Anon = FieldDecl::Create(Context, OwningClass, Record->getLocation(), 1268 /*IdentifierInfo=*/0, 1269 Context.getTypeDeclType(Record), 1270 /*BitWidth=*/0, /*Mutable=*/false, 1271 DS.getSourceRange().getBegin()); 1272 Anon->setAccess(AS_public); 1273 if (getLangOptions().CPlusPlus) 1274 FieldCollector->Add(cast<FieldDecl>(Anon)); 1275 } else { 1276 VarDecl::StorageClass SC; 1277 switch (DS.getStorageClassSpec()) { 1278 default: assert(0 && "Unknown storage class!"); 1279 case DeclSpec::SCS_unspecified: SC = VarDecl::None; break; 1280 case DeclSpec::SCS_extern: SC = VarDecl::Extern; break; 1281 case DeclSpec::SCS_static: SC = VarDecl::Static; break; 1282 case DeclSpec::SCS_auto: SC = VarDecl::Auto; break; 1283 case DeclSpec::SCS_register: SC = VarDecl::Register; break; 1284 case DeclSpec::SCS_private_extern: SC = VarDecl::PrivateExtern; break; 1285 case DeclSpec::SCS_mutable: 1286 // mutable can only appear on non-static class members, so it's always 1287 // an error here 1288 Diag(Record->getLocation(), diag::err_mutable_nonmember); 1289 Invalid = true; 1290 SC = VarDecl::None; 1291 break; 1292 } 1293 1294 Anon = VarDecl::Create(Context, Owner, Record->getLocation(), 1295 /*IdentifierInfo=*/0, 1296 Context.getTypeDeclType(Record), 1297 SC, DS.getSourceRange().getBegin()); 1298 } 1299 Anon->setImplicit(); 1300 1301 // Add the anonymous struct/union object to the current 1302 // context. We'll be referencing this object when we refer to one of 1303 // its members. 1304 Owner->addDecl(Anon); 1305 1306 // Inject the members of the anonymous struct/union into the owning 1307 // context and into the identifier resolver chain for name lookup 1308 // purposes. 1309 if (InjectAnonymousStructOrUnionMembers(S, Owner, Record)) 1310 Invalid = true; 1311 1312 // Mark this as an anonymous struct/union type. Note that we do not 1313 // do this until after we have already checked and injected the 1314 // members of this anonymous struct/union type, because otherwise 1315 // the members could be injected twice: once by DeclContext when it 1316 // builds its lookup table, and once by 1317 // InjectAnonymousStructOrUnionMembers. 1318 Record->setAnonymousStructOrUnion(true); 1319 1320 if (Invalid) 1321 Anon->setInvalidDecl(); 1322 1323 return DeclPtrTy::make(Anon); 1324} 1325 1326 1327/// GetNameForDeclarator - Determine the full declaration name for the 1328/// given Declarator. 1329DeclarationName Sema::GetNameForDeclarator(Declarator &D) { 1330 switch (D.getKind()) { 1331 case Declarator::DK_Abstract: 1332 assert(D.getIdentifier() == 0 && "abstract declarators have no name"); 1333 return DeclarationName(); 1334 1335 case Declarator::DK_Normal: 1336 assert (D.getIdentifier() != 0 && "normal declarators have an identifier"); 1337 return DeclarationName(D.getIdentifier()); 1338 1339 case Declarator::DK_Constructor: { 1340 QualType Ty = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1341 Ty = Context.getCanonicalType(Ty); 1342 return Context.DeclarationNames.getCXXConstructorName(Ty); 1343 } 1344 1345 case Declarator::DK_Destructor: { 1346 QualType Ty = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1347 Ty = Context.getCanonicalType(Ty); 1348 return Context.DeclarationNames.getCXXDestructorName(Ty); 1349 } 1350 1351 case Declarator::DK_Conversion: { 1352 // FIXME: We'd like to keep the non-canonical type for diagnostics! 1353 QualType Ty = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1354 Ty = Context.getCanonicalType(Ty); 1355 return Context.DeclarationNames.getCXXConversionFunctionName(Ty); 1356 } 1357 1358 case Declarator::DK_Operator: 1359 assert(D.getIdentifier() == 0 && "operator names have no identifier"); 1360 return Context.DeclarationNames.getCXXOperatorName( 1361 D.getOverloadedOperator()); 1362 } 1363 1364 assert(false && "Unknown name kind"); 1365 return DeclarationName(); 1366} 1367 1368/// isNearlyMatchingFunction - Determine whether the C++ functions 1369/// Declaration and Definition are "nearly" matching. This heuristic 1370/// is used to improve diagnostics in the case where an out-of-line 1371/// function definition doesn't match any declaration within 1372/// the class or namespace. 1373static bool isNearlyMatchingFunction(ASTContext &Context, 1374 FunctionDecl *Declaration, 1375 FunctionDecl *Definition) { 1376 if (Declaration->param_size() != Definition->param_size()) 1377 return false; 1378 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 1379 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 1380 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 1381 1382 DeclParamTy = Context.getCanonicalType(DeclParamTy.getNonReferenceType()); 1383 DefParamTy = Context.getCanonicalType(DefParamTy.getNonReferenceType()); 1384 if (DeclParamTy.getUnqualifiedType() != DefParamTy.getUnqualifiedType()) 1385 return false; 1386 } 1387 1388 return true; 1389} 1390 1391Sema::DeclPtrTy 1392Sema::HandleDeclarator(Scope *S, Declarator &D, 1393 MultiTemplateParamsArg TemplateParamLists, 1394 bool IsFunctionDefinition) { 1395 DeclarationName Name = GetNameForDeclarator(D); 1396 1397 // All of these full declarators require an identifier. If it doesn't have 1398 // one, the ParsedFreeStandingDeclSpec action should be used. 1399 if (!Name) { 1400 if (!D.isInvalidType()) // Reject this if we think it is valid. 1401 Diag(D.getDeclSpec().getSourceRange().getBegin(), 1402 diag::err_declarator_need_ident) 1403 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 1404 return DeclPtrTy(); 1405 } 1406 1407 // The scope passed in may not be a decl scope. Zip up the scope tree until 1408 // we find one that is. 1409 while ((S->getFlags() & Scope::DeclScope) == 0 || 1410 (S->getFlags() & Scope::TemplateParamScope) != 0) 1411 S = S->getParent(); 1412 1413 DeclContext *DC; 1414 NamedDecl *PrevDecl; 1415 NamedDecl *New; 1416 1417 QualType R = GetTypeForDeclarator(D, S); 1418 1419 // See if this is a redefinition of a variable in the same scope. 1420 if (D.getCXXScopeSpec().isInvalid()) { 1421 DC = CurContext; 1422 PrevDecl = 0; 1423 D.setInvalidType(); 1424 } else if (!D.getCXXScopeSpec().isSet()) { 1425 LookupNameKind NameKind = LookupOrdinaryName; 1426 1427 // If the declaration we're planning to build will be a function 1428 // or object with linkage, then look for another declaration with 1429 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 1430 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 1431 /* Do nothing*/; 1432 else if (R->isFunctionType()) { 1433 if (CurContext->isFunctionOrMethod() || 1434 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 1435 NameKind = LookupRedeclarationWithLinkage; 1436 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 1437 NameKind = LookupRedeclarationWithLinkage; 1438 else if (CurContext->getLookupContext()->isTranslationUnit() && 1439 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 1440 NameKind = LookupRedeclarationWithLinkage; 1441 1442 DC = CurContext; 1443 PrevDecl = LookupName(S, Name, NameKind, true, 1444 NameKind == LookupRedeclarationWithLinkage, 1445 D.getIdentifierLoc()); 1446 } else { // Something like "int foo::x;" 1447 DC = computeDeclContext(D.getCXXScopeSpec(), true); 1448 // FIXME: RequireCompleteDeclContext(D.getCXXScopeSpec()); ? 1449 PrevDecl = LookupQualifiedName(DC, Name, LookupOrdinaryName, true); 1450 1451 // C++ 7.3.1.2p2: 1452 // Members (including explicit specializations of templates) of a named 1453 // namespace can also be defined outside that namespace by explicit 1454 // qualification of the name being defined, provided that the entity being 1455 // defined was already declared in the namespace and the definition appears 1456 // after the point of declaration in a namespace that encloses the 1457 // declarations namespace. 1458 // 1459 // Note that we only check the context at this point. We don't yet 1460 // have enough information to make sure that PrevDecl is actually 1461 // the declaration we want to match. For example, given: 1462 // 1463 // class X { 1464 // void f(); 1465 // void f(float); 1466 // }; 1467 // 1468 // void X::f(int) { } // ill-formed 1469 // 1470 // In this case, PrevDecl will point to the overload set 1471 // containing the two f's declared in X, but neither of them 1472 // matches. 1473 1474 // First check whether we named the global scope. 1475 if (isa<TranslationUnitDecl>(DC)) { 1476 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 1477 << Name << D.getCXXScopeSpec().getRange(); 1478 } else if (!CurContext->Encloses(DC)) { 1479 // The qualifying scope doesn't enclose the original declaration. 1480 // Emit diagnostic based on current scope. 1481 SourceLocation L = D.getIdentifierLoc(); 1482 SourceRange R = D.getCXXScopeSpec().getRange(); 1483 if (isa<FunctionDecl>(CurContext)) 1484 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 1485 else 1486 Diag(L, diag::err_invalid_declarator_scope) 1487 << Name << cast<NamedDecl>(DC) << R; 1488 D.setInvalidType(); 1489 } 1490 } 1491 1492 if (PrevDecl && PrevDecl->isTemplateParameter()) { 1493 // Maybe we will complain about the shadowed template parameter. 1494 if (!D.isInvalidType()) 1495 if (DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl)) 1496 D.setInvalidType(); 1497 1498 // Just pretend that we didn't see the previous declaration. 1499 PrevDecl = 0; 1500 } 1501 1502 // In C++, the previous declaration we find might be a tag type 1503 // (class or enum). In this case, the new declaration will hide the 1504 // tag type. Note that this does does not apply if we're declaring a 1505 // typedef (C++ [dcl.typedef]p4). 1506 if (PrevDecl && PrevDecl->getIdentifierNamespace() == Decl::IDNS_Tag && 1507 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 1508 PrevDecl = 0; 1509 1510 bool Redeclaration = false; 1511 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 1512 if (TemplateParamLists.size()) { 1513 Diag(D.getIdentifierLoc(), diag::err_template_typedef); 1514 return DeclPtrTy(); 1515 } 1516 1517 New = ActOnTypedefDeclarator(S, D, DC, R, PrevDecl, Redeclaration); 1518 } else if (R->isFunctionType()) { 1519 New = ActOnFunctionDeclarator(S, D, DC, R, PrevDecl, 1520 move(TemplateParamLists), 1521 IsFunctionDefinition, Redeclaration); 1522 } else { 1523 New = ActOnVariableDeclarator(S, D, DC, R, PrevDecl, 1524 move(TemplateParamLists), 1525 Redeclaration); 1526 } 1527 1528 if (New == 0) 1529 return DeclPtrTy(); 1530 1531 // If this has an identifier and is not an invalid redeclaration, 1532 // add it to the scope stack. 1533 if (Name && !(Redeclaration && New->isInvalidDecl())) 1534 PushOnScopeChains(New, S); 1535 1536 return DeclPtrTy::make(New); 1537} 1538 1539/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 1540/// types into constant array types in certain situations which would otherwise 1541/// be errors (for GCC compatibility). 1542static QualType TryToFixInvalidVariablyModifiedType(QualType T, 1543 ASTContext &Context, 1544 bool &SizeIsNegative) { 1545 // This method tries to turn a variable array into a constant 1546 // array even when the size isn't an ICE. This is necessary 1547 // for compatibility with code that depends on gcc's buggy 1548 // constant expression folding, like struct {char x[(int)(char*)2];} 1549 SizeIsNegative = false; 1550 1551 if (const PointerType* PTy = dyn_cast<PointerType>(T)) { 1552 QualType Pointee = PTy->getPointeeType(); 1553 QualType FixedType = 1554 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative); 1555 if (FixedType.isNull()) return FixedType; 1556 FixedType = Context.getPointerType(FixedType); 1557 FixedType.setCVRQualifiers(T.getCVRQualifiers()); 1558 return FixedType; 1559 } 1560 1561 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 1562 if (!VLATy) 1563 return QualType(); 1564 // FIXME: We should probably handle this case 1565 if (VLATy->getElementType()->isVariablyModifiedType()) 1566 return QualType(); 1567 1568 Expr::EvalResult EvalResult; 1569 if (!VLATy->getSizeExpr() || 1570 !VLATy->getSizeExpr()->Evaluate(EvalResult, Context) || 1571 !EvalResult.Val.isInt()) 1572 return QualType(); 1573 1574 llvm::APSInt &Res = EvalResult.Val.getInt(); 1575 if (Res >= llvm::APSInt(Res.getBitWidth(), Res.isUnsigned())) { 1576 Expr* ArySizeExpr = VLATy->getSizeExpr(); 1577 // FIXME: here we could "steal" (how?) ArySizeExpr from the VLA, 1578 // so as to transfer ownership to the ConstantArrayWithExpr. 1579 // Alternatively, we could "clone" it (how?). 1580 // Since we don't know how to do things above, we just use the 1581 // very same Expr*. 1582 return Context.getConstantArrayWithExprType(VLATy->getElementType(), 1583 Res, ArySizeExpr, 1584 ArrayType::Normal, 0, 1585 VLATy->getBracketsRange()); 1586 } 1587 1588 SizeIsNegative = true; 1589 return QualType(); 1590} 1591 1592/// \brief Register the given locally-scoped external C declaration so 1593/// that it can be found later for redeclarations 1594void 1595Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, NamedDecl *PrevDecl, 1596 Scope *S) { 1597 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 1598 "Decl is not a locally-scoped decl!"); 1599 // Note that we have a locally-scoped external with this name. 1600 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 1601 1602 if (!PrevDecl) 1603 return; 1604 1605 // If there was a previous declaration of this variable, it may be 1606 // in our identifier chain. Update the identifier chain with the new 1607 // declaration. 1608 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 1609 // The previous declaration was found on the identifer resolver 1610 // chain, so remove it from its scope. 1611 while (S && !S->isDeclScope(DeclPtrTy::make(PrevDecl))) 1612 S = S->getParent(); 1613 1614 if (S) 1615 S->RemoveDecl(DeclPtrTy::make(PrevDecl)); 1616 } 1617} 1618 1619/// \brief Diagnose function specifiers on a declaration of an identifier that 1620/// does not identify a function. 1621void Sema::DiagnoseFunctionSpecifiers(Declarator& D) { 1622 // FIXME: We should probably indicate the identifier in question to avoid 1623 // confusion for constructs like "inline int a(), b;" 1624 if (D.getDeclSpec().isInlineSpecified()) 1625 Diag(D.getDeclSpec().getInlineSpecLoc(), 1626 diag::err_inline_non_function); 1627 1628 if (D.getDeclSpec().isVirtualSpecified()) 1629 Diag(D.getDeclSpec().getVirtualSpecLoc(), 1630 diag::err_virtual_non_function); 1631 1632 if (D.getDeclSpec().isExplicitSpecified()) 1633 Diag(D.getDeclSpec().getExplicitSpecLoc(), 1634 diag::err_explicit_non_function); 1635} 1636 1637NamedDecl* 1638Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 1639 QualType R, Decl* PrevDecl, bool &Redeclaration) { 1640 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 1641 if (D.getCXXScopeSpec().isSet()) { 1642 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 1643 << D.getCXXScopeSpec().getRange(); 1644 D.setInvalidType(); 1645 // Pretend we didn't see the scope specifier. 1646 DC = 0; 1647 } 1648 1649 if (getLangOptions().CPlusPlus) { 1650 // Check that there are no default arguments (C++ only). 1651 CheckExtraCXXDefaultArguments(D); 1652 } 1653 1654 DiagnoseFunctionSpecifiers(D); 1655 1656 if (D.getDeclSpec().isThreadSpecified()) 1657 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 1658 1659 TypedefDecl *NewTD = ParseTypedefDecl(S, D, R); 1660 if (!NewTD) return 0; 1661 1662 if (D.isInvalidType()) 1663 NewTD->setInvalidDecl(); 1664 1665 // Handle attributes prior to checking for duplicates in MergeVarDecl 1666 ProcessDeclAttributes(S, NewTD, D); 1667 // Merge the decl with the existing one if appropriate. If the decl is 1668 // in an outer scope, it isn't the same thing. 1669 if (PrevDecl && isDeclInScope(PrevDecl, DC, S)) { 1670 Redeclaration = true; 1671 MergeTypeDefDecl(NewTD, PrevDecl); 1672 } 1673 1674 // C99 6.7.7p2: If a typedef name specifies a variably modified type 1675 // then it shall have block scope. 1676 QualType T = NewTD->getUnderlyingType(); 1677 if (T->isVariablyModifiedType()) { 1678 CurFunctionNeedsScopeChecking = true; 1679 1680 if (S->getFnParent() == 0) { 1681 bool SizeIsNegative; 1682 QualType FixedTy = 1683 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative); 1684 if (!FixedTy.isNull()) { 1685 Diag(D.getIdentifierLoc(), diag::warn_illegal_constant_array_size); 1686 NewTD->setUnderlyingType(FixedTy); 1687 } else { 1688 if (SizeIsNegative) 1689 Diag(D.getIdentifierLoc(), diag::err_typecheck_negative_array_size); 1690 else if (T->isVariableArrayType()) 1691 Diag(D.getIdentifierLoc(), diag::err_vla_decl_in_file_scope); 1692 else 1693 Diag(D.getIdentifierLoc(), diag::err_vm_decl_in_file_scope); 1694 NewTD->setInvalidDecl(); 1695 } 1696 } 1697 } 1698 1699 // If this is the C FILE type, notify the AST context. 1700 if (IdentifierInfo *II = NewTD->getIdentifier()) 1701 if (!NewTD->isInvalidDecl() && 1702 NewTD->getDeclContext()->getLookupContext()->isTranslationUnit() && 1703 II->isStr("FILE")) 1704 Context.setFILEDecl(NewTD); 1705 1706 return NewTD; 1707} 1708 1709/// \brief Determines whether the given declaration is an out-of-scope 1710/// previous declaration. 1711/// 1712/// This routine should be invoked when name lookup has found a 1713/// previous declaration (PrevDecl) that is not in the scope where a 1714/// new declaration by the same name is being introduced. If the new 1715/// declaration occurs in a local scope, previous declarations with 1716/// linkage may still be considered previous declarations (C99 1717/// 6.2.2p4-5, C++ [basic.link]p6). 1718/// 1719/// \param PrevDecl the previous declaration found by name 1720/// lookup 1721/// 1722/// \param DC the context in which the new declaration is being 1723/// declared. 1724/// 1725/// \returns true if PrevDecl is an out-of-scope previous declaration 1726/// for a new delcaration with the same name. 1727static bool 1728isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 1729 ASTContext &Context) { 1730 if (!PrevDecl) 1731 return 0; 1732 1733 // FIXME: PrevDecl could be an OverloadedFunctionDecl, in which 1734 // case we need to check each of the overloaded functions. 1735 if (!PrevDecl->hasLinkage()) 1736 return false; 1737 1738 if (Context.getLangOptions().CPlusPlus) { 1739 // C++ [basic.link]p6: 1740 // If there is a visible declaration of an entity with linkage 1741 // having the same name and type, ignoring entities declared 1742 // outside the innermost enclosing namespace scope, the block 1743 // scope declaration declares that same entity and receives the 1744 // linkage of the previous declaration. 1745 DeclContext *OuterContext = DC->getLookupContext(); 1746 if (!OuterContext->isFunctionOrMethod()) 1747 // This rule only applies to block-scope declarations. 1748 return false; 1749 else { 1750 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 1751 if (PrevOuterContext->isRecord()) 1752 // We found a member function: ignore it. 1753 return false; 1754 else { 1755 // Find the innermost enclosing namespace for the new and 1756 // previous declarations. 1757 while (!OuterContext->isFileContext()) 1758 OuterContext = OuterContext->getParent(); 1759 while (!PrevOuterContext->isFileContext()) 1760 PrevOuterContext = PrevOuterContext->getParent(); 1761 1762 // The previous declaration is in a different namespace, so it 1763 // isn't the same function. 1764 if (OuterContext->getPrimaryContext() != 1765 PrevOuterContext->getPrimaryContext()) 1766 return false; 1767 } 1768 } 1769 } 1770 1771 return true; 1772} 1773 1774NamedDecl* 1775Sema::ActOnVariableDeclarator(Scope* S, Declarator& D, DeclContext* DC, 1776 QualType R,NamedDecl* PrevDecl, 1777 MultiTemplateParamsArg TemplateParamLists, 1778 bool &Redeclaration) { 1779 DeclarationName Name = GetNameForDeclarator(D); 1780 1781 // Check that there are no default arguments (C++ only). 1782 if (getLangOptions().CPlusPlus) 1783 CheckExtraCXXDefaultArguments(D); 1784 1785 VarDecl *NewVD; 1786 VarDecl::StorageClass SC; 1787 switch (D.getDeclSpec().getStorageClassSpec()) { 1788 default: assert(0 && "Unknown storage class!"); 1789 case DeclSpec::SCS_unspecified: SC = VarDecl::None; break; 1790 case DeclSpec::SCS_extern: SC = VarDecl::Extern; break; 1791 case DeclSpec::SCS_static: SC = VarDecl::Static; break; 1792 case DeclSpec::SCS_auto: SC = VarDecl::Auto; break; 1793 case DeclSpec::SCS_register: SC = VarDecl::Register; break; 1794 case DeclSpec::SCS_private_extern: SC = VarDecl::PrivateExtern; break; 1795 case DeclSpec::SCS_mutable: 1796 // mutable can only appear on non-static class members, so it's always 1797 // an error here 1798 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 1799 D.setInvalidType(); 1800 SC = VarDecl::None; 1801 break; 1802 } 1803 1804 IdentifierInfo *II = Name.getAsIdentifierInfo(); 1805 if (!II) { 1806 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 1807 << Name.getAsString(); 1808 return 0; 1809 } 1810 1811 DiagnoseFunctionSpecifiers(D); 1812 1813 if (!DC->isRecord() && S->getFnParent() == 0) { 1814 // C99 6.9p2: The storage-class specifiers auto and register shall not 1815 // appear in the declaration specifiers in an external declaration. 1816 if (SC == VarDecl::Auto || SC == VarDecl::Register) { 1817 1818 // If this is a register variable with an asm label specified, then this 1819 // is a GNU extension. 1820 if (SC == VarDecl::Register && D.getAsmLabel()) 1821 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register); 1822 else 1823 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 1824 D.setInvalidType(); 1825 } 1826 } 1827 if (DC->isRecord() && !CurContext->isRecord()) { 1828 // This is an out-of-line definition of a static data member. 1829 if (SC == VarDecl::Static) { 1830 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 1831 diag::err_static_out_of_line) 1832 << CodeModificationHint::CreateRemoval( 1833 SourceRange(D.getDeclSpec().getStorageClassSpecLoc())); 1834 } else if (SC == VarDecl::None) 1835 SC = VarDecl::Static; 1836 } 1837 if (SC == VarDecl::Static) { 1838 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) { 1839 if (RD->isLocalClass()) 1840 Diag(D.getIdentifierLoc(), 1841 diag::err_static_data_member_not_allowed_in_local_class) 1842 << Name << RD->getDeclName(); 1843 } 1844 } 1845 1846 // Check that we can declare a template here. 1847 if (TemplateParamLists.size() && 1848 CheckTemplateDeclScope(S, TemplateParamLists)) 1849 return 0; 1850 1851 // Match up the template parameter lists with the scope specifier, then 1852 // determine whether we have a template or a template specialization. 1853 if (TemplateParameterList *TemplateParams 1854 = MatchTemplateParametersToScopeSpecifier( 1855 D.getDeclSpec().getSourceRange().getBegin(), 1856 D.getCXXScopeSpec(), 1857 (TemplateParameterList**)TemplateParamLists.get(), 1858 TemplateParamLists.size())) { 1859 if (TemplateParams->size() > 0) { 1860 // There is no such thing as a variable template. 1861 Diag(D.getIdentifierLoc(), diag::err_template_variable) 1862 << II 1863 << SourceRange(TemplateParams->getTemplateLoc(), 1864 TemplateParams->getRAngleLoc()); 1865 return 0; 1866 } else { 1867 // There is an extraneous 'template<>' for this variable. Complain 1868 // about it, but allow the declaration of the variable. 1869 Diag(TemplateParams->getTemplateLoc(), 1870 diag::err_template_variable_noparams) 1871 << II 1872 << SourceRange(TemplateParams->getTemplateLoc(), 1873 TemplateParams->getRAngleLoc()); 1874 } 1875 } 1876 1877 NewVD = VarDecl::Create(Context, DC, D.getIdentifierLoc(), 1878 II, R, SC, 1879 // FIXME: Move to DeclGroup... 1880 D.getDeclSpec().getSourceRange().getBegin()); 1881 1882 if (D.isInvalidType()) 1883 NewVD->setInvalidDecl(); 1884 1885 if (D.getDeclSpec().isThreadSpecified()) { 1886 if (NewVD->hasLocalStorage()) 1887 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global); 1888 else if (!Context.Target.isTLSSupported()) 1889 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported); 1890 else 1891 NewVD->setThreadSpecified(true); 1892 } 1893 1894 // Set the lexical context. If the declarator has a C++ scope specifier, the 1895 // lexical context will be different from the semantic context. 1896 NewVD->setLexicalDeclContext(CurContext); 1897 1898 // Handle attributes prior to checking for duplicates in MergeVarDecl 1899 ProcessDeclAttributes(S, NewVD, D); 1900 1901 // Handle GNU asm-label extension (encoded as an attribute). 1902 if (Expr *E = (Expr*) D.getAsmLabel()) { 1903 // The parser guarantees this is a string. 1904 StringLiteral *SE = cast<StringLiteral>(E); 1905 NewVD->addAttr(::new (Context) AsmLabelAttr(std::string(SE->getStrData(), 1906 SE->getByteLength()))); 1907 } 1908 1909 // If name lookup finds a previous declaration that is not in the 1910 // same scope as the new declaration, this may still be an 1911 // acceptable redeclaration. 1912 if (PrevDecl && !isDeclInScope(PrevDecl, DC, S) && 1913 !(NewVD->hasLinkage() && 1914 isOutOfScopePreviousDeclaration(PrevDecl, DC, Context))) 1915 PrevDecl = 0; 1916 1917 // Merge the decl with the existing one if appropriate. 1918 if (PrevDecl) { 1919 if (isa<FieldDecl>(PrevDecl) && D.getCXXScopeSpec().isSet()) { 1920 // The user tried to define a non-static data member 1921 // out-of-line (C++ [dcl.meaning]p1). 1922 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 1923 << D.getCXXScopeSpec().getRange(); 1924 PrevDecl = 0; 1925 NewVD->setInvalidDecl(); 1926 } 1927 } else if (D.getCXXScopeSpec().isSet()) { 1928 // No previous declaration in the qualifying scope. 1929 Diag(D.getIdentifierLoc(), diag::err_typecheck_no_member) 1930 << Name << D.getCXXScopeSpec().getRange(); 1931 NewVD->setInvalidDecl(); 1932 } 1933 1934 CheckVariableDeclaration(NewVD, PrevDecl, Redeclaration); 1935 1936 // If this is a locally-scoped extern C variable, update the map of 1937 // such variables. 1938 if (CurContext->isFunctionOrMethod() && NewVD->isExternC(Context) && 1939 !NewVD->isInvalidDecl()) 1940 RegisterLocallyScopedExternCDecl(NewVD, PrevDecl, S); 1941 1942 return NewVD; 1943} 1944 1945/// \brief Perform semantic checking on a newly-created variable 1946/// declaration. 1947/// 1948/// This routine performs all of the type-checking required for a 1949/// variable declaration once it has been built. It is used both to 1950/// check variables after they have been parsed and their declarators 1951/// have been translated into a declaration, and to check variables 1952/// that have been instantiated from a template. 1953/// 1954/// Sets NewVD->isInvalidDecl() if an error was encountered. 1955void Sema::CheckVariableDeclaration(VarDecl *NewVD, NamedDecl *PrevDecl, 1956 bool &Redeclaration) { 1957 // If the decl is already known invalid, don't check it. 1958 if (NewVD->isInvalidDecl()) 1959 return; 1960 1961 QualType T = NewVD->getType(); 1962 1963 if (T->isObjCInterfaceType()) { 1964 Diag(NewVD->getLocation(), diag::err_statically_allocated_object); 1965 return NewVD->setInvalidDecl(); 1966 } 1967 1968 // The variable can not have an abstract class type. 1969 if (RequireNonAbstractType(NewVD->getLocation(), T, 1970 diag::err_abstract_type_in_decl, 1971 AbstractVariableType)) 1972 return NewVD->setInvalidDecl(); 1973 1974 // Emit an error if an address space was applied to decl with local storage. 1975 // This includes arrays of objects with address space qualifiers, but not 1976 // automatic variables that point to other address spaces. 1977 // ISO/IEC TR 18037 S5.1.2 1978 if (NewVD->hasLocalStorage() && (T.getAddressSpace() != 0)) { 1979 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 1980 return NewVD->setInvalidDecl(); 1981 } 1982 1983 if (NewVD->hasLocalStorage() && T.isObjCGCWeak() 1984 && !NewVD->hasAttr<BlocksAttr>()) 1985 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 1986 1987 bool isVM = T->isVariablyModifiedType(); 1988 if (isVM || NewVD->hasAttr<CleanupAttr>() || 1989 NewVD->hasAttr<BlocksAttr>()) 1990 CurFunctionNeedsScopeChecking = true; 1991 1992 if ((isVM && NewVD->hasLinkage()) || 1993 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { 1994 bool SizeIsNegative; 1995 QualType FixedTy = 1996 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative); 1997 1998 if (FixedTy.isNull() && T->isVariableArrayType()) { 1999 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 2000 // FIXME: This won't give the correct result for 2001 // int a[10][n]; 2002 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 2003 2004 if (NewVD->isFileVarDecl()) 2005 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 2006 << SizeRange; 2007 else if (NewVD->getStorageClass() == VarDecl::Static) 2008 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 2009 << SizeRange; 2010 else 2011 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 2012 << SizeRange; 2013 return NewVD->setInvalidDecl(); 2014 } 2015 2016 if (FixedTy.isNull()) { 2017 if (NewVD->isFileVarDecl()) 2018 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 2019 else 2020 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 2021 return NewVD->setInvalidDecl(); 2022 } 2023 2024 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 2025 NewVD->setType(FixedTy); 2026 } 2027 2028 if (!PrevDecl && NewVD->isExternC(Context)) { 2029 // Since we did not find anything by this name and we're declaring 2030 // an extern "C" variable, look for a non-visible extern "C" 2031 // declaration with the same name. 2032 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 2033 = LocallyScopedExternalDecls.find(NewVD->getDeclName()); 2034 if (Pos != LocallyScopedExternalDecls.end()) 2035 PrevDecl = Pos->second; 2036 } 2037 2038 if (T->isVoidType() && !NewVD->hasExternalStorage()) { 2039 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 2040 << T; 2041 return NewVD->setInvalidDecl(); 2042 } 2043 2044 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { 2045 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); 2046 return NewVD->setInvalidDecl(); 2047 } 2048 2049 if (isVM && NewVD->hasAttr<BlocksAttr>()) { 2050 Diag(NewVD->getLocation(), diag::err_block_on_vm); 2051 return NewVD->setInvalidDecl(); 2052 } 2053 2054 if (PrevDecl) { 2055 Redeclaration = true; 2056 MergeVarDecl(NewVD, PrevDecl); 2057 } 2058} 2059 2060NamedDecl* 2061Sema::ActOnFunctionDeclarator(Scope* S, Declarator& D, DeclContext* DC, 2062 QualType R, NamedDecl* PrevDecl, 2063 MultiTemplateParamsArg TemplateParamLists, 2064 bool IsFunctionDefinition, bool &Redeclaration) { 2065 assert(R.getTypePtr()->isFunctionType()); 2066 2067 DeclarationName Name = GetNameForDeclarator(D); 2068 FunctionDecl::StorageClass SC = FunctionDecl::None; 2069 switch (D.getDeclSpec().getStorageClassSpec()) { 2070 default: assert(0 && "Unknown storage class!"); 2071 case DeclSpec::SCS_auto: 2072 case DeclSpec::SCS_register: 2073 case DeclSpec::SCS_mutable: 2074 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2075 diag::err_typecheck_sclass_func); 2076 D.setInvalidType(); 2077 break; 2078 case DeclSpec::SCS_unspecified: SC = FunctionDecl::None; break; 2079 case DeclSpec::SCS_extern: SC = FunctionDecl::Extern; break; 2080 case DeclSpec::SCS_static: { 2081 if (CurContext->getLookupContext()->isFunctionOrMethod()) { 2082 // C99 6.7.1p5: 2083 // The declaration of an identifier for a function that has 2084 // block scope shall have no explicit storage-class specifier 2085 // other than extern 2086 // See also (C++ [dcl.stc]p4). 2087 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2088 diag::err_static_block_func); 2089 SC = FunctionDecl::None; 2090 } else 2091 SC = FunctionDecl::Static; 2092 break; 2093 } 2094 case DeclSpec::SCS_private_extern: SC = FunctionDecl::PrivateExtern;break; 2095 } 2096 2097 if (D.getDeclSpec().isThreadSpecified()) 2098 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 2099 2100 bool isInline = D.getDeclSpec().isInlineSpecified(); 2101 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2102 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 2103 2104 // Check that the return type is not an abstract class type. 2105 // For record types, this is done by the AbstractClassUsageDiagnoser once 2106 // the class has been completely parsed. 2107 if (!DC->isRecord() && 2108 RequireNonAbstractType(D.getIdentifierLoc(), 2109 R->getAsFunctionType()->getResultType(), 2110 diag::err_abstract_type_in_decl, 2111 AbstractReturnType)) 2112 D.setInvalidType(); 2113 2114 // Do not allow returning a objc interface by-value. 2115 if (R->getAsFunctionType()->getResultType()->isObjCInterfaceType()) { 2116 Diag(D.getIdentifierLoc(), 2117 diag::err_object_cannot_be_passed_returned_by_value) << 0 2118 << R->getAsFunctionType()->getResultType(); 2119 D.setInvalidType(); 2120 } 2121 2122 // Check that we can declare a template here. 2123 if (TemplateParamLists.size() && 2124 CheckTemplateDeclScope(S, TemplateParamLists)) 2125 return 0; 2126 2127 bool isVirtualOkay = false; 2128 FunctionDecl *NewFD; 2129 if (D.getKind() == Declarator::DK_Constructor) { 2130 // This is a C++ constructor declaration. 2131 assert(DC->isRecord() && 2132 "Constructors can only be declared in a member context"); 2133 2134 R = CheckConstructorDeclarator(D, R, SC); 2135 2136 // Create the new declaration 2137 NewFD = CXXConstructorDecl::Create(Context, 2138 cast<CXXRecordDecl>(DC), 2139 D.getIdentifierLoc(), Name, R, 2140 isExplicit, isInline, 2141 /*isImplicitlyDeclared=*/false); 2142 } else if (D.getKind() == Declarator::DK_Destructor) { 2143 // This is a C++ destructor declaration. 2144 if (DC->isRecord()) { 2145 R = CheckDestructorDeclarator(D, SC); 2146 2147 NewFD = CXXDestructorDecl::Create(Context, 2148 cast<CXXRecordDecl>(DC), 2149 D.getIdentifierLoc(), Name, R, 2150 isInline, 2151 /*isImplicitlyDeclared=*/false); 2152 2153 isVirtualOkay = true; 2154 } else { 2155 Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 2156 2157 // Create a FunctionDecl to satisfy the function definition parsing 2158 // code path. 2159 NewFD = FunctionDecl::Create(Context, DC, D.getIdentifierLoc(), 2160 Name, R, SC, isInline, 2161 /*hasPrototype=*/true, 2162 // FIXME: Move to DeclGroup... 2163 D.getDeclSpec().getSourceRange().getBegin()); 2164 D.setInvalidType(); 2165 } 2166 } else if (D.getKind() == Declarator::DK_Conversion) { 2167 if (!DC->isRecord()) { 2168 Diag(D.getIdentifierLoc(), 2169 diag::err_conv_function_not_member); 2170 return 0; 2171 } 2172 2173 CheckConversionDeclarator(D, R, SC); 2174 NewFD = CXXConversionDecl::Create(Context, cast<CXXRecordDecl>(DC), 2175 D.getIdentifierLoc(), Name, R, 2176 isInline, isExplicit); 2177 2178 isVirtualOkay = true; 2179 } else if (DC->isRecord()) { 2180 // If the of the function is the same as the name of the record, then this 2181 // must be an invalid constructor that has a return type. 2182 // (The parser checks for a return type and makes the declarator a 2183 // constructor if it has no return type). 2184 // must have an invalid constructor that has a return type 2185 if (Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ 2186 Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 2187 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2188 << SourceRange(D.getIdentifierLoc()); 2189 return 0; 2190 } 2191 2192 // This is a C++ method declaration. 2193 NewFD = CXXMethodDecl::Create(Context, cast<CXXRecordDecl>(DC), 2194 D.getIdentifierLoc(), Name, R, 2195 (SC == FunctionDecl::Static), isInline); 2196 2197 isVirtualOkay = (SC != FunctionDecl::Static); 2198 } else { 2199 // Determine whether the function was written with a 2200 // prototype. This true when: 2201 // - we're in C++ (where every function has a prototype), 2202 // - there is a prototype in the declarator, or 2203 // - the type R of the function is some kind of typedef or other reference 2204 // to a type name (which eventually refers to a function type). 2205 bool HasPrototype = 2206 getLangOptions().CPlusPlus || 2207 (D.getNumTypeObjects() && D.getTypeObject(0).Fun.hasPrototype) || 2208 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 2209 2210 NewFD = FunctionDecl::Create(Context, DC, 2211 D.getIdentifierLoc(), 2212 Name, R, SC, isInline, HasPrototype, 2213 // FIXME: Move to DeclGroup... 2214 D.getDeclSpec().getSourceRange().getBegin()); 2215 } 2216 2217 if (D.isInvalidType()) 2218 NewFD->setInvalidDecl(); 2219 2220 // Set the lexical context. If the declarator has a C++ 2221 // scope specifier, the lexical context will be different 2222 // from the semantic context. 2223 NewFD->setLexicalDeclContext(CurContext); 2224 2225 // Match up the template parameter lists with the scope specifier, then 2226 // determine whether we have a template or a template specialization. 2227 FunctionTemplateDecl *FunctionTemplate = 0; 2228 if (TemplateParameterList *TemplateParams 2229 = MatchTemplateParametersToScopeSpecifier( 2230 D.getDeclSpec().getSourceRange().getBegin(), 2231 D.getCXXScopeSpec(), 2232 (TemplateParameterList**)TemplateParamLists.get(), 2233 TemplateParamLists.size())) { 2234 if (TemplateParams->size() > 0) { 2235 // This is a function template 2236 FunctionTemplate = FunctionTemplateDecl::Create(Context, CurContext, 2237 NewFD->getLocation(), 2238 Name, TemplateParams, 2239 NewFD); 2240 NewFD->setDescribedFunctionTemplate(FunctionTemplate); 2241 } else { 2242 // FIXME: Handle function template specializations 2243 } 2244 2245 // FIXME: Free this memory properly. 2246 TemplateParamLists.release(); 2247 } 2248 2249 // C++ [dcl.fct.spec]p5: 2250 // The virtual specifier shall only be used in declarations of 2251 // nonstatic class member functions that appear within a 2252 // member-specification of a class declaration; see 10.3. 2253 // 2254 if (isVirtual && !NewFD->isInvalidDecl()) { 2255 if (!isVirtualOkay) { 2256 Diag(D.getDeclSpec().getVirtualSpecLoc(), 2257 diag::err_virtual_non_function); 2258 } else if (!CurContext->isRecord()) { 2259 // 'virtual' was specified outside of the class. 2260 Diag(D.getDeclSpec().getVirtualSpecLoc(), diag::err_virtual_out_of_class) 2261 << CodeModificationHint::CreateRemoval( 2262 SourceRange(D.getDeclSpec().getVirtualSpecLoc())); 2263 } else { 2264 // Okay: Add virtual to the method. 2265 cast<CXXMethodDecl>(NewFD)->setVirtualAsWritten(true); 2266 CXXRecordDecl *CurClass = cast<CXXRecordDecl>(DC); 2267 CurClass->setAggregate(false); 2268 CurClass->setPOD(false); 2269 CurClass->setPolymorphic(true); 2270 CurClass->setHasTrivialConstructor(false); 2271 CurClass->setHasTrivialCopyConstructor(false); 2272 CurClass->setHasTrivialCopyAssignment(false); 2273 } 2274 } 2275 2276 if (CXXMethodDecl *NewMD = dyn_cast<CXXMethodDecl>(NewFD)) { 2277 // Look for virtual methods in base classes that this method might override. 2278 2279 BasePaths Paths; 2280 if (LookupInBases(cast<CXXRecordDecl>(DC), 2281 MemberLookupCriteria(NewMD), Paths)) { 2282 for (BasePaths::decl_iterator I = Paths.found_decls_begin(), 2283 E = Paths.found_decls_end(); I != E; ++I) { 2284 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) { 2285 if (!CheckOverridingFunctionReturnType(NewMD, OldMD) && 2286 !CheckOverridingFunctionExceptionSpec(NewMD, OldMD)) 2287 NewMD->addOverriddenMethod(OldMD); 2288 } 2289 } 2290 } 2291 } 2292 2293 if (SC == FunctionDecl::Static && isa<CXXMethodDecl>(NewFD) && 2294 !CurContext->isRecord()) { 2295 // C++ [class.static]p1: 2296 // A data or function member of a class may be declared static 2297 // in a class definition, in which case it is a static member of 2298 // the class. 2299 2300 // Complain about the 'static' specifier if it's on an out-of-line 2301 // member function definition. 2302 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2303 diag::err_static_out_of_line) 2304 << CodeModificationHint::CreateRemoval( 2305 SourceRange(D.getDeclSpec().getStorageClassSpecLoc())); 2306 } 2307 2308 // Handle GNU asm-label extension (encoded as an attribute). 2309 if (Expr *E = (Expr*) D.getAsmLabel()) { 2310 // The parser guarantees this is a string. 2311 StringLiteral *SE = cast<StringLiteral>(E); 2312 NewFD->addAttr(::new (Context) AsmLabelAttr(std::string(SE->getStrData(), 2313 SE->getByteLength()))); 2314 } 2315 2316 // Copy the parameter declarations from the declarator D to the function 2317 // declaration NewFD, if they are available. First scavenge them into Params. 2318 llvm::SmallVector<ParmVarDecl*, 16> Params; 2319 if (D.getNumTypeObjects() > 0) { 2320 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2321 2322 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 2323 // function that takes no arguments, not a function that takes a 2324 // single void argument. 2325 // We let through "const void" here because Sema::GetTypeForDeclarator 2326 // already checks for that case. 2327 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 2328 FTI.ArgInfo[0].Param && 2329 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()) { 2330 // Empty arg list, don't push any params. 2331 ParmVarDecl *Param = FTI.ArgInfo[0].Param.getAs<ParmVarDecl>(); 2332 2333 // In C++, the empty parameter-type-list must be spelled "void"; a 2334 // typedef of void is not permitted. 2335 if (getLangOptions().CPlusPlus && 2336 Param->getType().getUnqualifiedType() != Context.VoidTy) 2337 Diag(Param->getLocation(), diag::err_param_typedef_of_void); 2338 // FIXME: Leaks decl? 2339 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 2340 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 2341 ParmVarDecl *Param = FTI.ArgInfo[i].Param.getAs<ParmVarDecl>(); 2342 assert(Param->getDeclContext() != NewFD && "Was set before ?"); 2343 Param->setDeclContext(NewFD); 2344 Params.push_back(Param); 2345 } 2346 } 2347 2348 } else if (const FunctionProtoType *FT = R->getAsFunctionProtoType()) { 2349 // When we're declaring a function with a typedef, typeof, etc as in the 2350 // following example, we'll need to synthesize (unnamed) 2351 // parameters for use in the declaration. 2352 // 2353 // @code 2354 // typedef void fn(int); 2355 // fn f; 2356 // @endcode 2357 2358 // Synthesize a parameter for each argument type. 2359 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 2360 AE = FT->arg_type_end(); AI != AE; ++AI) { 2361 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, 2362 SourceLocation(), 0, 2363 *AI, VarDecl::None, 0); 2364 Param->setImplicit(); 2365 Params.push_back(Param); 2366 } 2367 } else { 2368 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && 2369 "Should not need args for typedef of non-prototype fn"); 2370 } 2371 // Finally, we know we have the right number of parameters, install them. 2372 NewFD->setParams(Context, Params.data(), Params.size()); 2373 2374 // If name lookup finds a previous declaration that is not in the 2375 // same scope as the new declaration, this may still be an 2376 // acceptable redeclaration. 2377 if (PrevDecl && !isDeclInScope(PrevDecl, DC, S) && 2378 !(NewFD->hasLinkage() && 2379 isOutOfScopePreviousDeclaration(PrevDecl, DC, Context))) 2380 PrevDecl = 0; 2381 2382 // Perform semantic checking on the function declaration. 2383 bool OverloadableAttrRequired = false; // FIXME: HACK! 2384 CheckFunctionDeclaration(NewFD, PrevDecl, Redeclaration, 2385 /*FIXME:*/OverloadableAttrRequired); 2386 2387 if (D.getCXXScopeSpec().isSet() && !NewFD->isInvalidDecl()) { 2388 // An out-of-line member function declaration must also be a 2389 // definition (C++ [dcl.meaning]p1). 2390 if (!IsFunctionDefinition) { 2391 Diag(NewFD->getLocation(), diag::err_out_of_line_declaration) 2392 << D.getCXXScopeSpec().getRange(); 2393 NewFD->setInvalidDecl(); 2394 } else if (!Redeclaration && (!PrevDecl || !isa<UsingDecl>(PrevDecl))) { 2395 // The user tried to provide an out-of-line definition for a 2396 // function that is a member of a class or namespace, but there 2397 // was no such member function declared (C++ [class.mfct]p2, 2398 // C++ [namespace.memdef]p2). For example: 2399 // 2400 // class X { 2401 // void f() const; 2402 // }; 2403 // 2404 // void X::f() { } // ill-formed 2405 // 2406 // Complain about this problem, and attempt to suggest close 2407 // matches (e.g., those that differ only in cv-qualifiers and 2408 // whether the parameter types are references). 2409 Diag(D.getIdentifierLoc(), diag::err_member_def_does_not_match) 2410 << cast<NamedDecl>(DC) << D.getCXXScopeSpec().getRange(); 2411 NewFD->setInvalidDecl(); 2412 2413 LookupResult Prev = LookupQualifiedName(DC, Name, LookupOrdinaryName, 2414 true); 2415 assert(!Prev.isAmbiguous() && 2416 "Cannot have an ambiguity in previous-declaration lookup"); 2417 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 2418 Func != FuncEnd; ++Func) { 2419 if (isa<FunctionDecl>(*Func) && 2420 isNearlyMatchingFunction(Context, cast<FunctionDecl>(*Func), NewFD)) 2421 Diag((*Func)->getLocation(), diag::note_member_def_close_match); 2422 } 2423 2424 PrevDecl = 0; 2425 } 2426 } 2427 2428 // Handle attributes. We need to have merged decls when handling attributes 2429 // (for example to check for conflicts, etc). 2430 // FIXME: This needs to happen before we merge declarations. Then, 2431 // let attribute merging cope with attribute conflicts. 2432 ProcessDeclAttributes(S, NewFD, D); 2433 AddKnownFunctionAttributes(NewFD); 2434 2435 if (OverloadableAttrRequired && !NewFD->getAttr<OverloadableAttr>()) { 2436 // If a function name is overloadable in C, then every function 2437 // with that name must be marked "overloadable". 2438 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 2439 << Redeclaration << NewFD; 2440 if (PrevDecl) 2441 Diag(PrevDecl->getLocation(), 2442 diag::note_attribute_overloadable_prev_overload); 2443 NewFD->addAttr(::new (Context) OverloadableAttr()); 2444 } 2445 2446 // If this is a locally-scoped extern C function, update the 2447 // map of such names. 2448 if (CurContext->isFunctionOrMethod() && NewFD->isExternC(Context) 2449 && !NewFD->isInvalidDecl()) 2450 RegisterLocallyScopedExternCDecl(NewFD, PrevDecl, S); 2451 2452 // Set this FunctionDecl's range up to the right paren. 2453 NewFD->setLocEnd(D.getSourceRange().getEnd()); 2454 2455 if (FunctionTemplate && NewFD->isInvalidDecl()) 2456 FunctionTemplate->setInvalidDecl(); 2457 2458 if (FunctionTemplate) 2459 return FunctionTemplate; 2460 2461 return NewFD; 2462} 2463 2464/// \brief Perform semantic checking of a new function declaration. 2465/// 2466/// Performs semantic analysis of the new function declaration 2467/// NewFD. This routine performs all semantic checking that does not 2468/// require the actual declarator involved in the declaration, and is 2469/// used both for the declaration of functions as they are parsed 2470/// (called via ActOnDeclarator) and for the declaration of functions 2471/// that have been instantiated via C++ template instantiation (called 2472/// via InstantiateDecl). 2473/// 2474/// This sets NewFD->isInvalidDecl() to true if there was an error. 2475void Sema::CheckFunctionDeclaration(FunctionDecl *NewFD, NamedDecl *&PrevDecl, 2476 bool &Redeclaration, 2477 bool &OverloadableAttrRequired) { 2478 // If NewFD is already known erroneous, don't do any of this checking. 2479 if (NewFD->isInvalidDecl()) 2480 return; 2481 2482 if (NewFD->getResultType()->isVariablyModifiedType()) { 2483 // Functions returning a variably modified type violate C99 6.7.5.2p2 2484 // because all functions have linkage. 2485 Diag(NewFD->getLocation(), diag::err_vm_func_decl); 2486 return NewFD->setInvalidDecl(); 2487 } 2488 2489 // Semantic checking for this function declaration (in isolation). 2490 if (getLangOptions().CPlusPlus) { 2491 // C++-specific checks. 2492 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { 2493 CheckConstructor(Constructor); 2494 } else if (isa<CXXDestructorDecl>(NewFD)) { 2495 CXXRecordDecl *Record = cast<CXXRecordDecl>(NewFD->getParent()); 2496 QualType ClassType = Context.getTypeDeclType(Record); 2497 if (!ClassType->isDependentType()) { 2498 ClassType = Context.getCanonicalType(ClassType); 2499 DeclarationName Name 2500 = Context.DeclarationNames.getCXXDestructorName(ClassType); 2501 if (NewFD->getDeclName() != Name) { 2502 Diag(NewFD->getLocation(), diag::err_destructor_name); 2503 return NewFD->setInvalidDecl(); 2504 } 2505 } 2506 Record->setUserDeclaredDestructor(true); 2507 // C++ [class]p4: A POD-struct is an aggregate class that has [...] no 2508 // user-defined destructor. 2509 Record->setPOD(false); 2510 2511 // C++ [class.dtor]p3: A destructor is trivial if it is an implicitly- 2512 // declared destructor. 2513 // FIXME: C++0x: don't do this for "= default" destructors 2514 Record->setHasTrivialDestructor(false); 2515 } else if (CXXConversionDecl *Conversion 2516 = dyn_cast<CXXConversionDecl>(NewFD)) 2517 ActOnConversionDeclarator(Conversion); 2518 2519 // Extra checking for C++ overloaded operators (C++ [over.oper]). 2520 if (NewFD->isOverloadedOperator() && 2521 CheckOverloadedOperatorDeclaration(NewFD)) 2522 return NewFD->setInvalidDecl(); 2523 } 2524 2525 // C99 6.7.4p6: 2526 // [... ] For a function with external linkage, the following 2527 // restrictions apply: [...] If all of the file scope declarations 2528 // for a function in a translation unit include the inline 2529 // function specifier without extern, then the definition in that 2530 // translation unit is an inline definition. An inline definition 2531 // does not provide an external definition for the function, and 2532 // does not forbid an external definition in another translation 2533 // unit. 2534 // 2535 // Here we determine whether this function, in isolation, would be a 2536 // C99 inline definition. MergeCompatibleFunctionDecls looks at 2537 // previous declarations. 2538 if (NewFD->isInline() && getLangOptions().C99 && 2539 NewFD->getStorageClass() == FunctionDecl::None && 2540 NewFD->getDeclContext()->getLookupContext()->isTranslationUnit()) 2541 NewFD->setC99InlineDefinition(true); 2542 2543 // Check for a previous declaration of this name. 2544 if (!PrevDecl && NewFD->isExternC(Context)) { 2545 // Since we did not find anything by this name and we're declaring 2546 // an extern "C" function, look for a non-visible extern "C" 2547 // declaration with the same name. 2548 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 2549 = LocallyScopedExternalDecls.find(NewFD->getDeclName()); 2550 if (Pos != LocallyScopedExternalDecls.end()) 2551 PrevDecl = Pos->second; 2552 } 2553 2554 // Merge or overload the declaration with an existing declaration of 2555 // the same name, if appropriate. 2556 if (PrevDecl) { 2557 // Determine whether NewFD is an overload of PrevDecl or 2558 // a declaration that requires merging. If it's an overload, 2559 // there's no more work to do here; we'll just add the new 2560 // function to the scope. 2561 OverloadedFunctionDecl::function_iterator MatchedDecl; 2562 2563 if (!getLangOptions().CPlusPlus && 2564 AllowOverloadingOfFunction(PrevDecl, Context)) { 2565 OverloadableAttrRequired = true; 2566 2567 // Functions marked "overloadable" must have a prototype (that 2568 // we can't get through declaration merging). 2569 if (!NewFD->getType()->getAsFunctionProtoType()) { 2570 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_no_prototype) 2571 << NewFD; 2572 Redeclaration = true; 2573 2574 // Turn this into a variadic function with no parameters. 2575 QualType R = Context.getFunctionType( 2576 NewFD->getType()->getAsFunctionType()->getResultType(), 2577 0, 0, true, 0); 2578 NewFD->setType(R); 2579 return NewFD->setInvalidDecl(); 2580 } 2581 } 2582 2583 if (PrevDecl && 2584 (!AllowOverloadingOfFunction(PrevDecl, Context) || 2585 !IsOverload(NewFD, PrevDecl, MatchedDecl)) && 2586 !isa<UsingDecl>(PrevDecl)) { 2587 Redeclaration = true; 2588 Decl *OldDecl = PrevDecl; 2589 2590 // If PrevDecl was an overloaded function, extract the 2591 // FunctionDecl that matched. 2592 if (isa<OverloadedFunctionDecl>(PrevDecl)) 2593 OldDecl = *MatchedDecl; 2594 2595 // NewFD and OldDecl represent declarations that need to be 2596 // merged. 2597 if (MergeFunctionDecl(NewFD, OldDecl)) 2598 return NewFD->setInvalidDecl(); 2599 2600 if (FunctionTemplateDecl *OldTemplateDecl 2601 = dyn_cast<FunctionTemplateDecl>(OldDecl)) 2602 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl()); 2603 else { 2604 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions 2605 NewFD->setAccess(OldDecl->getAccess()); 2606 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 2607 } 2608 } 2609 } 2610 2611 // In C++, check default arguments now that we have merged decls. Unless 2612 // the lexical context is the class, because in this case this is done 2613 // during delayed parsing anyway. 2614 if (getLangOptions().CPlusPlus && !CurContext->isRecord()) 2615 CheckCXXDefaultArguments(NewFD); 2616} 2617 2618bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 2619 // FIXME: Need strict checking. In C89, we need to check for 2620 // any assignment, increment, decrement, function-calls, or 2621 // commas outside of a sizeof. In C99, it's the same list, 2622 // except that the aforementioned are allowed in unevaluated 2623 // expressions. Everything else falls under the 2624 // "may accept other forms of constant expressions" exception. 2625 // (We never end up here for C++, so the constant expression 2626 // rules there don't matter.) 2627 if (Init->isConstantInitializer(Context)) 2628 return false; 2629 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 2630 << Init->getSourceRange(); 2631 return true; 2632} 2633 2634void Sema::AddInitializerToDecl(DeclPtrTy dcl, FullExprArg init) { 2635 AddInitializerToDecl(dcl, init.release(), /*DirectInit=*/false); 2636} 2637 2638/// AddInitializerToDecl - Adds the initializer Init to the 2639/// declaration dcl. If DirectInit is true, this is C++ direct 2640/// initialization rather than copy initialization. 2641void Sema::AddInitializerToDecl(DeclPtrTy dcl, ExprArg init, bool DirectInit) { 2642 Decl *RealDecl = dcl.getAs<Decl>(); 2643 // If there is no declaration, there was an error parsing it. Just ignore 2644 // the initializer. 2645 if (RealDecl == 0) 2646 return; 2647 2648 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 2649 // With declarators parsed the way they are, the parser cannot 2650 // distinguish between a normal initializer and a pure-specifier. 2651 // Thus this grotesque test. 2652 IntegerLiteral *IL; 2653 Expr *Init = static_cast<Expr *>(init.get()); 2654 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 2655 Context.getCanonicalType(IL->getType()) == Context.IntTy) { 2656 if (Method->isVirtualAsWritten()) { 2657 Method->setPure(); 2658 2659 // A class is abstract if at least one function is pure virtual. 2660 cast<CXXRecordDecl>(CurContext)->setAbstract(true); 2661 } else if (!Method->isInvalidDecl()) { 2662 Diag(Method->getLocation(), diag::err_non_virtual_pure) 2663 << Method->getDeclName() << Init->getSourceRange(); 2664 Method->setInvalidDecl(); 2665 } 2666 } else { 2667 Diag(Method->getLocation(), diag::err_member_function_initialization) 2668 << Method->getDeclName() << Init->getSourceRange(); 2669 Method->setInvalidDecl(); 2670 } 2671 return; 2672 } 2673 2674 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 2675 if (!VDecl) { 2676 if (getLangOptions().CPlusPlus && 2677 RealDecl->getLexicalDeclContext()->isRecord() && 2678 isa<NamedDecl>(RealDecl)) 2679 Diag(RealDecl->getLocation(), diag::err_member_initialization) 2680 << cast<NamedDecl>(RealDecl)->getDeclName(); 2681 else 2682 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 2683 RealDecl->setInvalidDecl(); 2684 return; 2685 } 2686 2687 if (!VDecl->getType()->isArrayType() && 2688 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 2689 diag::err_typecheck_decl_incomplete_type)) { 2690 RealDecl->setInvalidDecl(); 2691 return; 2692 } 2693 2694 const VarDecl *Def = 0; 2695 if (VDecl->getDefinition(Def)) { 2696 Diag(VDecl->getLocation(), diag::err_redefinition) 2697 << VDecl->getDeclName(); 2698 Diag(Def->getLocation(), diag::note_previous_definition); 2699 VDecl->setInvalidDecl(); 2700 return; 2701 } 2702 2703 // Take ownership of the expression, now that we're sure we have somewhere 2704 // to put it. 2705 Expr *Init = init.takeAs<Expr>(); 2706 assert(Init && "missing initializer"); 2707 2708 // Get the decls type and save a reference for later, since 2709 // CheckInitializerTypes may change it. 2710 QualType DclT = VDecl->getType(), SavT = DclT; 2711 if (VDecl->isBlockVarDecl()) { 2712 if (VDecl->hasExternalStorage()) { // C99 6.7.8p5 2713 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 2714 VDecl->setInvalidDecl(); 2715 } else if (!VDecl->isInvalidDecl()) { 2716 if (CheckInitializerTypes(Init, DclT, VDecl->getLocation(), 2717 VDecl->getDeclName(), DirectInit)) 2718 VDecl->setInvalidDecl(); 2719 2720 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 2721 // Don't check invalid declarations to avoid emitting useless diagnostics. 2722 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 2723 if (VDecl->getStorageClass() == VarDecl::Static) // C99 6.7.8p4. 2724 CheckForConstantInitializer(Init, DclT); 2725 } 2726 } 2727 } else if (VDecl->isStaticDataMember() && 2728 VDecl->getLexicalDeclContext()->isRecord()) { 2729 // This is an in-class initialization for a static data member, e.g., 2730 // 2731 // struct S { 2732 // static const int value = 17; 2733 // }; 2734 2735 // Attach the initializer 2736 VDecl->setInit(Context, Init); 2737 2738 // C++ [class.mem]p4: 2739 // A member-declarator can contain a constant-initializer only 2740 // if it declares a static member (9.4) of const integral or 2741 // const enumeration type, see 9.4.2. 2742 QualType T = VDecl->getType(); 2743 if (!T->isDependentType() && 2744 (!Context.getCanonicalType(T).isConstQualified() || 2745 !T->isIntegralType())) { 2746 Diag(VDecl->getLocation(), diag::err_member_initialization) 2747 << VDecl->getDeclName() << Init->getSourceRange(); 2748 VDecl->setInvalidDecl(); 2749 } else { 2750 // C++ [class.static.data]p4: 2751 // If a static data member is of const integral or const 2752 // enumeration type, its declaration in the class definition 2753 // can specify a constant-initializer which shall be an 2754 // integral constant expression (5.19). 2755 if (!Init->isTypeDependent() && 2756 !Init->getType()->isIntegralType()) { 2757 // We have a non-dependent, non-integral or enumeration type. 2758 Diag(Init->getSourceRange().getBegin(), 2759 diag::err_in_class_initializer_non_integral_type) 2760 << Init->getType() << Init->getSourceRange(); 2761 VDecl->setInvalidDecl(); 2762 } else if (!Init->isTypeDependent() && !Init->isValueDependent()) { 2763 // Check whether the expression is a constant expression. 2764 llvm::APSInt Value; 2765 SourceLocation Loc; 2766 if (!Init->isIntegerConstantExpr(Value, Context, &Loc)) { 2767 Diag(Loc, diag::err_in_class_initializer_non_constant) 2768 << Init->getSourceRange(); 2769 VDecl->setInvalidDecl(); 2770 } else if (!VDecl->getType()->isDependentType()) 2771 ImpCastExprToType(Init, VDecl->getType()); 2772 } 2773 } 2774 } else if (VDecl->isFileVarDecl()) { 2775 if (VDecl->getStorageClass() == VarDecl::Extern) 2776 Diag(VDecl->getLocation(), diag::warn_extern_init); 2777 if (!VDecl->isInvalidDecl()) 2778 if (CheckInitializerTypes(Init, DclT, VDecl->getLocation(), 2779 VDecl->getDeclName(), DirectInit)) 2780 VDecl->setInvalidDecl(); 2781 2782 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 2783 // Don't check invalid declarations to avoid emitting useless diagnostics. 2784 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 2785 // C99 6.7.8p4. All file scoped initializers need to be constant. 2786 CheckForConstantInitializer(Init, DclT); 2787 } 2788 } 2789 // If the type changed, it means we had an incomplete type that was 2790 // completed by the initializer. For example: 2791 // int ary[] = { 1, 3, 5 }; 2792 // "ary" transitions from a VariableArrayType to a ConstantArrayType. 2793 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 2794 VDecl->setType(DclT); 2795 Init->setType(DclT); 2796 } 2797 2798 // Attach the initializer to the decl. 2799 VDecl->setInit(Context, Init); 2800 2801 // If the previous declaration of VDecl was a tentative definition, 2802 // remove it from the set of tentative definitions. 2803 if (VDecl->getPreviousDeclaration() && 2804 VDecl->getPreviousDeclaration()->isTentativeDefinition(Context)) { 2805 llvm::DenseMap<DeclarationName, VarDecl *>::iterator Pos 2806 = TentativeDefinitions.find(VDecl->getDeclName()); 2807 assert(Pos != TentativeDefinitions.end() && 2808 "Unrecorded tentative definition?"); 2809 TentativeDefinitions.erase(Pos); 2810 } 2811 2812 return; 2813} 2814 2815void Sema::ActOnUninitializedDecl(DeclPtrTy dcl, 2816 bool TypeContainsUndeducedAuto) { 2817 Decl *RealDecl = dcl.getAs<Decl>(); 2818 2819 // If there is no declaration, there was an error parsing it. Just ignore it. 2820 if (RealDecl == 0) 2821 return; 2822 2823 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 2824 QualType Type = Var->getType(); 2825 2826 // Record tentative definitions. 2827 if (Var->isTentativeDefinition(Context)) 2828 TentativeDefinitions[Var->getDeclName()] = Var; 2829 2830 // C++ [dcl.init.ref]p3: 2831 // The initializer can be omitted for a reference only in a 2832 // parameter declaration (8.3.5), in the declaration of a 2833 // function return type, in the declaration of a class member 2834 // within its class declaration (9.2), and where the extern 2835 // specifier is explicitly used. 2836 if (Type->isReferenceType() && !Var->hasExternalStorage()) { 2837 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 2838 << Var->getDeclName() 2839 << SourceRange(Var->getLocation(), Var->getLocation()); 2840 Var->setInvalidDecl(); 2841 return; 2842 } 2843 2844 // C++0x [dcl.spec.auto]p3 2845 if (TypeContainsUndeducedAuto) { 2846 Diag(Var->getLocation(), diag::err_auto_var_requires_init) 2847 << Var->getDeclName() << Type; 2848 Var->setInvalidDecl(); 2849 return; 2850 } 2851 2852 // C++ [dcl.init]p9: 2853 // 2854 // If no initializer is specified for an object, and the object 2855 // is of (possibly cv-qualified) non-POD class type (or array 2856 // thereof), the object shall be default-initialized; if the 2857 // object is of const-qualified type, the underlying class type 2858 // shall have a user-declared default constructor. 2859 if (getLangOptions().CPlusPlus) { 2860 QualType InitType = Type; 2861 if (const ArrayType *Array = Context.getAsArrayType(Type)) 2862 InitType = Array->getElementType(); 2863 if ((!Var->hasExternalStorage() && !Var->isExternC(Context)) && 2864 InitType->isRecordType() && !InitType->isDependentType()) { 2865 CXXRecordDecl *RD = 2866 cast<CXXRecordDecl>(InitType->getAsRecordType()->getDecl()); 2867 CXXConstructorDecl *Constructor = 0; 2868 if (!RequireCompleteType(Var->getLocation(), InitType, 2869 diag::err_invalid_incomplete_type_use)) 2870 Constructor 2871 = PerformInitializationByConstructor(InitType, 0, 0, 2872 Var->getLocation(), 2873 SourceRange(Var->getLocation(), 2874 Var->getLocation()), 2875 Var->getDeclName(), 2876 IK_Default); 2877 if (!Constructor) 2878 Var->setInvalidDecl(); 2879 else { 2880 if (!RD->hasTrivialConstructor()) 2881 InitializeVarWithConstructor(Var, Constructor, InitType, 0, 0); 2882 // FIXME. Must do all that is needed to destroy the object 2883 // on scope exit. For now, just mark the destructor as used. 2884 MarkDestructorReferenced(Var->getLocation(), InitType); 2885 } 2886 } 2887 } 2888 2889#if 0 2890 // FIXME: Temporarily disabled because we are not properly parsing 2891 // linkage specifications on declarations, e.g., 2892 // 2893 // extern "C" const CGPoint CGPointerZero; 2894 // 2895 // C++ [dcl.init]p9: 2896 // 2897 // If no initializer is specified for an object, and the 2898 // object is of (possibly cv-qualified) non-POD class type (or 2899 // array thereof), the object shall be default-initialized; if 2900 // the object is of const-qualified type, the underlying class 2901 // type shall have a user-declared default 2902 // constructor. Otherwise, if no initializer is specified for 2903 // an object, the object and its subobjects, if any, have an 2904 // indeterminate initial value; if the object or any of its 2905 // subobjects are of const-qualified type, the program is 2906 // ill-formed. 2907 // 2908 // This isn't technically an error in C, so we don't diagnose it. 2909 // 2910 // FIXME: Actually perform the POD/user-defined default 2911 // constructor check. 2912 if (getLangOptions().CPlusPlus && 2913 Context.getCanonicalType(Type).isConstQualified() && 2914 !Var->hasExternalStorage()) 2915 Diag(Var->getLocation(), diag::err_const_var_requires_init) 2916 << Var->getName() 2917 << SourceRange(Var->getLocation(), Var->getLocation()); 2918#endif 2919 } 2920} 2921 2922Sema::DeclGroupPtrTy Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, 2923 DeclPtrTy *Group, 2924 unsigned NumDecls) { 2925 llvm::SmallVector<Decl*, 8> Decls; 2926 2927 if (DS.isTypeSpecOwned()) 2928 Decls.push_back((Decl*)DS.getTypeRep()); 2929 2930 for (unsigned i = 0; i != NumDecls; ++i) 2931 if (Decl *D = Group[i].getAs<Decl>()) 2932 Decls.push_back(D); 2933 2934 // Perform semantic analysis that depends on having fully processed both 2935 // the declarator and initializer. 2936 for (unsigned i = 0, e = Decls.size(); i != e; ++i) { 2937 VarDecl *IDecl = dyn_cast<VarDecl>(Decls[i]); 2938 if (!IDecl) 2939 continue; 2940 QualType T = IDecl->getType(); 2941 2942 // Block scope. C99 6.7p7: If an identifier for an object is declared with 2943 // no linkage (C99 6.2.2p6), the type for the object shall be complete... 2944 if (IDecl->isBlockVarDecl() && !IDecl->hasExternalStorage()) { 2945 if (!IDecl->isInvalidDecl() && 2946 RequireCompleteType(IDecl->getLocation(), T, 2947 diag::err_typecheck_decl_incomplete_type)) 2948 IDecl->setInvalidDecl(); 2949 } 2950 // File scope. C99 6.9.2p2: A declaration of an identifier for an 2951 // object that has file scope without an initializer, and without a 2952 // storage-class specifier or with the storage-class specifier "static", 2953 // constitutes a tentative definition. Note: A tentative definition with 2954 // external linkage is valid (C99 6.2.2p5). 2955 if (IDecl->isTentativeDefinition(Context) && !IDecl->isInvalidDecl()) { 2956 if (const IncompleteArrayType *ArrayT 2957 = Context.getAsIncompleteArrayType(T)) { 2958 if (RequireCompleteType(IDecl->getLocation(), 2959 ArrayT->getElementType(), 2960 diag::err_illegal_decl_array_incomplete_type)) 2961 IDecl->setInvalidDecl(); 2962 } 2963 else if (IDecl->getStorageClass() == VarDecl::Static) { 2964 // C99 6.9.2p3: If the declaration of an identifier for an object is 2965 // a tentative definition and has internal linkage (C99 6.2.2p3), the 2966 // declared type shall not be an incomplete type. 2967 // NOTE: code such as the following 2968 // static struct s; 2969 // struct s { int a; }; 2970 // is accepted by gcc. Hence here we issue a warning instead of 2971 // an error and we do not invalidate the static declaration. 2972 // NOTE: to avoid multiple warnings, only check the first declaration. 2973 if (IDecl->getPreviousDeclaration() == 0) 2974 RequireCompleteType(IDecl->getLocation(), T, 2975 diag::ext_typecheck_decl_incomplete_type); 2976 } 2977 } 2978 } 2979 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, 2980 Decls.data(), Decls.size())); 2981} 2982 2983 2984/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 2985/// to introduce parameters into function prototype scope. 2986Sema::DeclPtrTy 2987Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 2988 const DeclSpec &DS = D.getDeclSpec(); 2989 2990 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 2991 VarDecl::StorageClass StorageClass = VarDecl::None; 2992 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 2993 StorageClass = VarDecl::Register; 2994 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 2995 Diag(DS.getStorageClassSpecLoc(), 2996 diag::err_invalid_storage_class_in_func_decl); 2997 D.getMutableDeclSpec().ClearStorageClassSpecs(); 2998 } 2999 3000 if (D.getDeclSpec().isThreadSpecified()) 3001 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 3002 3003 DiagnoseFunctionSpecifiers(D); 3004 3005 // Check that there are no default arguments inside the type of this 3006 // parameter (C++ only). 3007 if (getLangOptions().CPlusPlus) 3008 CheckExtraCXXDefaultArguments(D); 3009 3010 TagDecl *OwnedDecl = 0; 3011 QualType parmDeclType = GetTypeForDeclarator(D, S, /*Skip=*/0, &OwnedDecl); 3012 3013 if (getLangOptions().CPlusPlus && OwnedDecl && OwnedDecl->isDefinition()) { 3014 // C++ [dcl.fct]p6: 3015 // Types shall not be defined in return or parameter types. 3016 Diag(OwnedDecl->getLocation(), diag::err_type_defined_in_param_type) 3017 << Context.getTypeDeclType(OwnedDecl); 3018 } 3019 3020 // TODO: CHECK FOR CONFLICTS, multiple decls with same name in one scope. 3021 // Can this happen for params? We already checked that they don't conflict 3022 // among each other. Here they can only shadow globals, which is ok. 3023 IdentifierInfo *II = D.getIdentifier(); 3024 if (II) { 3025 if (NamedDecl *PrevDecl = LookupName(S, II, LookupOrdinaryName)) { 3026 if (PrevDecl->isTemplateParameter()) { 3027 // Maybe we will complain about the shadowed template parameter. 3028 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 3029 // Just pretend that we didn't see the previous declaration. 3030 PrevDecl = 0; 3031 } else if (S->isDeclScope(DeclPtrTy::make(PrevDecl))) { 3032 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 3033 3034 // Recover by removing the name 3035 II = 0; 3036 D.SetIdentifier(0, D.getIdentifierLoc()); 3037 } 3038 } 3039 } 3040 3041 // Parameters can not be abstract class types. 3042 // For record types, this is done by the AbstractClassUsageDiagnoser once 3043 // the class has been completely parsed. 3044 if (!CurContext->isRecord() && 3045 RequireNonAbstractType(D.getIdentifierLoc(), parmDeclType, 3046 diag::err_abstract_type_in_decl, 3047 AbstractParamType)) 3048 D.setInvalidType(true); 3049 3050 QualType T = adjustParameterType(parmDeclType); 3051 3052 ParmVarDecl *New; 3053 if (T == parmDeclType) // parameter type did not need adjustment 3054 New = ParmVarDecl::Create(Context, CurContext, 3055 D.getIdentifierLoc(), II, 3056 parmDeclType, StorageClass, 3057 0); 3058 else // keep track of both the adjusted and unadjusted types 3059 New = OriginalParmVarDecl::Create(Context, CurContext, 3060 D.getIdentifierLoc(), II, T, 3061 parmDeclType, StorageClass, 0); 3062 3063 if (D.isInvalidType()) 3064 New->setInvalidDecl(); 3065 3066 // Parameter declarators cannot be interface types. All ObjC objects are 3067 // passed by reference. 3068 if (T->isObjCInterfaceType()) { 3069 Diag(D.getIdentifierLoc(), 3070 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T; 3071 New->setInvalidDecl(); 3072 } 3073 3074 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 3075 if (D.getCXXScopeSpec().isSet()) { 3076 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 3077 << D.getCXXScopeSpec().getRange(); 3078 New->setInvalidDecl(); 3079 } 3080 3081 // Add the parameter declaration into this scope. 3082 S->AddDecl(DeclPtrTy::make(New)); 3083 if (II) 3084 IdResolver.AddDecl(New); 3085 3086 ProcessDeclAttributes(S, New, D); 3087 3088 if (New->hasAttr<BlocksAttr>()) { 3089 Diag(New->getLocation(), diag::err_block_on_nonlocal); 3090 } 3091 return DeclPtrTy::make(New); 3092} 3093 3094void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 3095 SourceLocation LocAfterDecls) { 3096 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 3097 "Not a function declarator!"); 3098 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 3099 3100 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 3101 // for a K&R function. 3102 if (!FTI.hasPrototype) { 3103 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 3104 --i; 3105 if (FTI.ArgInfo[i].Param == 0) { 3106 std::string Code = " int "; 3107 Code += FTI.ArgInfo[i].Ident->getName(); 3108 Code += ";\n"; 3109 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 3110 << FTI.ArgInfo[i].Ident 3111 << CodeModificationHint::CreateInsertion(LocAfterDecls, Code); 3112 3113 // Implicitly declare the argument as type 'int' for lack of a better 3114 // type. 3115 DeclSpec DS; 3116 const char* PrevSpec; // unused 3117 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 3118 PrevSpec); 3119 Declarator ParamD(DS, Declarator::KNRTypeListContext); 3120 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 3121 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 3122 } 3123 } 3124 } 3125} 3126 3127Sema::DeclPtrTy Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, 3128 Declarator &D) { 3129 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 3130 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 3131 "Not a function declarator!"); 3132 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 3133 3134 if (FTI.hasPrototype) { 3135 // FIXME: Diagnose arguments without names in C. 3136 } 3137 3138 Scope *ParentScope = FnBodyScope->getParent(); 3139 3140 DeclPtrTy DP = HandleDeclarator(ParentScope, D, 3141 MultiTemplateParamsArg(*this), 3142 /*IsFunctionDefinition=*/true); 3143 return ActOnStartOfFunctionDef(FnBodyScope, DP); 3144} 3145 3146Sema::DeclPtrTy Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, DeclPtrTy D) { 3147 if (!D) 3148 return D; 3149 FunctionDecl *FD = cast<FunctionDecl>(D.getAs<Decl>()); 3150 3151 CurFunctionNeedsScopeChecking = false; 3152 3153 // See if this is a redefinition. 3154 const FunctionDecl *Definition; 3155 if (FD->getBody(Definition)) { 3156 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 3157 Diag(Definition->getLocation(), diag::note_previous_definition); 3158 } 3159 3160 // Builtin functions cannot be defined. 3161 if (unsigned BuiltinID = FD->getBuiltinID(Context)) { 3162 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 3163 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 3164 FD->setInvalidDecl(); 3165 } 3166 } 3167 3168 // The return type of a function definition must be complete 3169 // (C99 6.9.1p3, C++ [dcl.fct]p6). 3170 QualType ResultType = FD->getResultType(); 3171 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 3172 !FD->isInvalidDecl() && 3173 RequireCompleteType(FD->getLocation(), ResultType, 3174 diag::err_func_def_incomplete_result)) 3175 FD->setInvalidDecl(); 3176 3177 // GNU warning -Wmissing-prototypes: 3178 // Warn if a global function is defined without a previous 3179 // prototype declaration. This warning is issued even if the 3180 // definition itself provides a prototype. The aim is to detect 3181 // global functions that fail to be declared in header files. 3182 if (!FD->isInvalidDecl() && FD->isGlobal() && !isa<CXXMethodDecl>(FD) && 3183 !FD->isMain()) { 3184 bool MissingPrototype = true; 3185 for (const FunctionDecl *Prev = FD->getPreviousDeclaration(); 3186 Prev; Prev = Prev->getPreviousDeclaration()) { 3187 // Ignore any declarations that occur in function or method 3188 // scope, because they aren't visible from the header. 3189 if (Prev->getDeclContext()->isFunctionOrMethod()) 3190 continue; 3191 3192 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 3193 break; 3194 } 3195 3196 if (MissingPrototype) 3197 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 3198 } 3199 3200 if (FnBodyScope) 3201 PushDeclContext(FnBodyScope, FD); 3202 3203 // Check the validity of our function parameters 3204 CheckParmsForFunctionDef(FD); 3205 3206 // Introduce our parameters into the function scope 3207 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 3208 ParmVarDecl *Param = FD->getParamDecl(p); 3209 Param->setOwningFunction(FD); 3210 3211 // If this has an identifier, add it to the scope stack. 3212 if (Param->getIdentifier() && FnBodyScope) 3213 PushOnScopeChains(Param, FnBodyScope); 3214 } 3215 3216 // Checking attributes of current function definition 3217 // dllimport attribute. 3218 if (FD->getAttr<DLLImportAttr>() && 3219 (!FD->getAttr<DLLExportAttr>())) { 3220 // dllimport attribute cannot be applied to definition. 3221 if (!(FD->getAttr<DLLImportAttr>())->isInherited()) { 3222 Diag(FD->getLocation(), 3223 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 3224 << "dllimport"; 3225 FD->setInvalidDecl(); 3226 return DeclPtrTy::make(FD); 3227 } else { 3228 // If a symbol previously declared dllimport is later defined, the 3229 // attribute is ignored in subsequent references, and a warning is 3230 // emitted. 3231 Diag(FD->getLocation(), 3232 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 3233 << FD->getNameAsCString() << "dllimport"; 3234 } 3235 } 3236 return DeclPtrTy::make(FD); 3237} 3238 3239Sema::DeclPtrTy Sema::ActOnFinishFunctionBody(DeclPtrTy D, StmtArg BodyArg) { 3240 return ActOnFinishFunctionBody(D, move(BodyArg), false); 3241} 3242 3243Sema::DeclPtrTy Sema::ActOnFinishFunctionBody(DeclPtrTy D, StmtArg BodyArg, 3244 bool IsInstantiation) { 3245 Decl *dcl = D.getAs<Decl>(); 3246 Stmt *Body = BodyArg.takeAs<Stmt>(); 3247 if (FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(dcl)) { 3248 FD->setBody(Body); 3249 3250 if (!FD->isInvalidDecl()) 3251 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end()); 3252 3253 // C++ [basic.def.odr]p2: 3254 // [...] A virtual member function is used if it is not pure. [...] 3255 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FD)) 3256 if (Method->isVirtual() && !Method->isPure()) 3257 MarkDeclarationReferenced(Method->getLocation(), Method); 3258 3259 assert(FD == getCurFunctionDecl() && "Function parsing confused"); 3260 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 3261 assert(MD == getCurMethodDecl() && "Method parsing confused"); 3262 MD->setBody(Body); 3263 MD->setEndLoc(Body->getLocEnd()); 3264 3265 if (!MD->isInvalidDecl()) 3266 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end()); 3267 } else { 3268 Body->Destroy(Context); 3269 return DeclPtrTy(); 3270 } 3271 if (!IsInstantiation) 3272 PopDeclContext(); 3273 3274 // Verify and clean out per-function state. 3275 3276 assert(&getLabelMap() == &FunctionLabelMap && "Didn't pop block right?"); 3277 3278 // Check goto/label use. 3279 for (llvm::DenseMap<IdentifierInfo*, LabelStmt*>::iterator 3280 I = FunctionLabelMap.begin(), E = FunctionLabelMap.end(); I != E; ++I) { 3281 LabelStmt *L = I->second; 3282 3283 // Verify that we have no forward references left. If so, there was a goto 3284 // or address of a label taken, but no definition of it. Label fwd 3285 // definitions are indicated with a null substmt. 3286 if (L->getSubStmt() != 0) 3287 continue; 3288 3289 // Emit error. 3290 Diag(L->getIdentLoc(), diag::err_undeclared_label_use) << L->getName(); 3291 3292 // At this point, we have gotos that use the bogus label. Stitch it into 3293 // the function body so that they aren't leaked and that the AST is well 3294 // formed. 3295 if (Body == 0) { 3296 // The whole function wasn't parsed correctly, just delete this. 3297 L->Destroy(Context); 3298 continue; 3299 } 3300 3301 // Otherwise, the body is valid: we want to stitch the label decl into the 3302 // function somewhere so that it is properly owned and so that the goto 3303 // has a valid target. Do this by creating a new compound stmt with the 3304 // label in it. 3305 3306 // Give the label a sub-statement. 3307 L->setSubStmt(new (Context) NullStmt(L->getIdentLoc())); 3308 3309 CompoundStmt *Compound = isa<CXXTryStmt>(Body) ? 3310 cast<CXXTryStmt>(Body)->getTryBlock() : 3311 cast<CompoundStmt>(Body); 3312 std::vector<Stmt*> Elements(Compound->body_begin(), Compound->body_end()); 3313 Elements.push_back(L); 3314 Compound->setStmts(Context, &Elements[0], Elements.size()); 3315 } 3316 FunctionLabelMap.clear(); 3317 3318 if (!Body) return D; 3319 3320 // Verify that that gotos and switch cases don't jump into scopes illegally. 3321 if (CurFunctionNeedsScopeChecking) 3322 DiagnoseInvalidJumps(Body); 3323 3324 // C++ constructors that have function-try-blocks can't have return 3325 // statements in the handlers of that block. (C++ [except.handle]p14) 3326 // Verify this. 3327 if (isa<CXXConstructorDecl>(dcl) && isa<CXXTryStmt>(Body)) 3328 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); 3329 3330 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) 3331 Destructor->computeBaseOrMembersToDestroy(Context); 3332 return D; 3333} 3334 3335/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 3336/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 3337NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 3338 IdentifierInfo &II, Scope *S) { 3339 // Before we produce a declaration for an implicitly defined 3340 // function, see whether there was a locally-scoped declaration of 3341 // this name as a function or variable. If so, use that 3342 // (non-visible) declaration, and complain about it. 3343 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3344 = LocallyScopedExternalDecls.find(&II); 3345 if (Pos != LocallyScopedExternalDecls.end()) { 3346 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 3347 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 3348 return Pos->second; 3349 } 3350 3351 // Extension in C99. Legal in C90, but warn about it. 3352 if (getLangOptions().C99) 3353 Diag(Loc, diag::ext_implicit_function_decl) << &II; 3354 else 3355 Diag(Loc, diag::warn_implicit_function_decl) << &II; 3356 3357 // FIXME: handle stuff like: 3358 // void foo() { extern float X(); } 3359 // void bar() { X(); } <-- implicit decl for X in another scope. 3360 3361 // Set a Declarator for the implicit definition: int foo(); 3362 const char *Dummy; 3363 DeclSpec DS; 3364 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy); 3365 Error = Error; // Silence warning. 3366 assert(!Error && "Error setting up implicit decl!"); 3367 Declarator D(DS, Declarator::BlockContext); 3368 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0, 3369 0, 0, false, SourceLocation(), 3370 false, 0,0,0, Loc, D), 3371 SourceLocation()); 3372 D.SetIdentifier(&II, Loc); 3373 3374 // Insert this function into translation-unit scope. 3375 3376 DeclContext *PrevDC = CurContext; 3377 CurContext = Context.getTranslationUnitDecl(); 3378 3379 FunctionDecl *FD = 3380 dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D).getAs<Decl>()); 3381 FD->setImplicit(); 3382 3383 CurContext = PrevDC; 3384 3385 AddKnownFunctionAttributes(FD); 3386 3387 return FD; 3388} 3389 3390/// \brief Adds any function attributes that we know a priori based on 3391/// the declaration of this function. 3392/// 3393/// These attributes can apply both to implicitly-declared builtins 3394/// (like __builtin___printf_chk) or to library-declared functions 3395/// like NSLog or printf. 3396void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 3397 if (FD->isInvalidDecl()) 3398 return; 3399 3400 // If this is a built-in function, map its builtin attributes to 3401 // actual attributes. 3402 if (unsigned BuiltinID = FD->getBuiltinID(Context)) { 3403 // Handle printf-formatting attributes. 3404 unsigned FormatIdx; 3405 bool HasVAListArg; 3406 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 3407 if (!FD->getAttr<FormatAttr>()) 3408 FD->addAttr(::new (Context) FormatAttr("printf", FormatIdx + 1, 3409 HasVAListArg ? 0 : FormatIdx + 2)); 3410 } 3411 3412 // Mark const if we don't care about errno and that is the only 3413 // thing preventing the function from being const. This allows 3414 // IRgen to use LLVM intrinsics for such functions. 3415 if (!getLangOptions().MathErrno && 3416 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 3417 if (!FD->getAttr<ConstAttr>()) 3418 FD->addAttr(::new (Context) ConstAttr()); 3419 } 3420 } 3421 3422 IdentifierInfo *Name = FD->getIdentifier(); 3423 if (!Name) 3424 return; 3425 if ((!getLangOptions().CPlusPlus && 3426 FD->getDeclContext()->isTranslationUnit()) || 3427 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 3428 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 3429 LinkageSpecDecl::lang_c)) { 3430 // Okay: this could be a libc/libm/Objective-C function we know 3431 // about. 3432 } else 3433 return; 3434 3435 if (Name->isStr("NSLog") || Name->isStr("NSLogv")) { 3436 if (const FormatAttr *Format = FD->getAttr<FormatAttr>()) { 3437 // FIXME: We known better than our headers. 3438 const_cast<FormatAttr *>(Format)->setType("printf"); 3439 } else 3440 FD->addAttr(::new (Context) FormatAttr("printf", 1, 3441 Name->isStr("NSLogv") ? 0 : 2)); 3442 } else if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { 3443 if (!FD->getAttr<FormatAttr>()) 3444 FD->addAttr(::new (Context) FormatAttr("printf", 2, 3445 Name->isStr("vasprintf") ? 0 : 3)); 3446 } 3447} 3448 3449TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T) { 3450 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 3451 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 3452 3453 // Scope manipulation handled by caller. 3454 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 3455 D.getIdentifierLoc(), 3456 D.getIdentifier(), 3457 T); 3458 3459 if (TagType *TT = dyn_cast<TagType>(T)) { 3460 TagDecl *TD = TT->getDecl(); 3461 3462 // If the TagDecl that the TypedefDecl points to is an anonymous decl 3463 // keep track of the TypedefDecl. 3464 if (!TD->getIdentifier() && !TD->getTypedefForAnonDecl()) 3465 TD->setTypedefForAnonDecl(NewTD); 3466 } 3467 3468 if (D.isInvalidType()) 3469 NewTD->setInvalidDecl(); 3470 return NewTD; 3471} 3472 3473 3474/// \brief Determine whether a tag with a given kind is acceptable 3475/// as a redeclaration of the given tag declaration. 3476/// 3477/// \returns true if the new tag kind is acceptable, false otherwise. 3478bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, 3479 TagDecl::TagKind NewTag, 3480 SourceLocation NewTagLoc, 3481 const IdentifierInfo &Name) { 3482 // C++ [dcl.type.elab]p3: 3483 // The class-key or enum keyword present in the 3484 // elaborated-type-specifier shall agree in kind with the 3485 // declaration to which the name in theelaborated-type-specifier 3486 // refers. This rule also applies to the form of 3487 // elaborated-type-specifier that declares a class-name or 3488 // friend class since it can be construed as referring to the 3489 // definition of the class. Thus, in any 3490 // elaborated-type-specifier, the enum keyword shall be used to 3491 // refer to an enumeration (7.2), the union class-keyshall be 3492 // used to refer to a union (clause 9), and either the class or 3493 // struct class-key shall be used to refer to a class (clause 9) 3494 // declared using the class or struct class-key. 3495 TagDecl::TagKind OldTag = Previous->getTagKind(); 3496 if (OldTag == NewTag) 3497 return true; 3498 3499 if ((OldTag == TagDecl::TK_struct || OldTag == TagDecl::TK_class) && 3500 (NewTag == TagDecl::TK_struct || NewTag == TagDecl::TK_class)) { 3501 // Warn about the struct/class tag mismatch. 3502 bool isTemplate = false; 3503 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) 3504 isTemplate = Record->getDescribedClassTemplate(); 3505 3506 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 3507 << (NewTag == TagDecl::TK_class) 3508 << isTemplate << &Name 3509 << CodeModificationHint::CreateReplacement(SourceRange(NewTagLoc), 3510 OldTag == TagDecl::TK_class? "class" : "struct"); 3511 Diag(Previous->getLocation(), diag::note_previous_use); 3512 return true; 3513 } 3514 return false; 3515} 3516 3517/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 3518/// former case, Name will be non-null. In the later case, Name will be null. 3519/// TagSpec indicates what kind of tag this is. TK indicates whether this is a 3520/// reference/declaration/definition of a tag. 3521Sema::DeclPtrTy Sema::ActOnTag(Scope *S, unsigned TagSpec, TagKind TK, 3522 SourceLocation KWLoc, const CXXScopeSpec &SS, 3523 IdentifierInfo *Name, SourceLocation NameLoc, 3524 AttributeList *Attr, AccessSpecifier AS, 3525 MultiTemplateParamsArg TemplateParameterLists, 3526 bool &OwnedDecl) { 3527 // If this is not a definition, it must have a name. 3528 assert((Name != 0 || TK == TK_Definition) && 3529 "Nameless record must be a definition!"); 3530 3531 OwnedDecl = false; 3532 TagDecl::TagKind Kind; 3533 switch (TagSpec) { 3534 default: assert(0 && "Unknown tag type!"); 3535 case DeclSpec::TST_struct: Kind = TagDecl::TK_struct; break; 3536 case DeclSpec::TST_union: Kind = TagDecl::TK_union; break; 3537 case DeclSpec::TST_class: Kind = TagDecl::TK_class; break; 3538 case DeclSpec::TST_enum: Kind = TagDecl::TK_enum; break; 3539 } 3540 3541 if (TK != TK_Reference) { 3542 if (TemplateParameterList *TemplateParams 3543 = MatchTemplateParametersToScopeSpecifier(KWLoc, SS, 3544 (TemplateParameterList**)TemplateParameterLists.get(), 3545 TemplateParameterLists.size())) { 3546 if (TemplateParams->size() > 0) { 3547 // This is a declaration or definition of a class template (which may 3548 // be a member of another template). 3549 OwnedDecl = false; 3550 DeclResult Result = ActOnClassTemplate(S, TagSpec, TK, KWLoc, 3551 SS, Name, NameLoc, Attr, 3552 move(TemplateParameterLists), 3553 AS); 3554 return Result.get(); 3555 } else { 3556 // FIXME: diagnose the extraneous 'template<>', once we recover 3557 // slightly better in ParseTemplate.cpp from bogus template 3558 // parameters. 3559 } 3560 } 3561 } 3562 3563 DeclContext *SearchDC = CurContext; 3564 DeclContext *DC = CurContext; 3565 NamedDecl *PrevDecl = 0; 3566 3567 bool Invalid = false; 3568 3569 if (Name && SS.isNotEmpty()) { 3570 // We have a nested-name tag ('struct foo::bar'). 3571 3572 // Check for invalid 'foo::'. 3573 if (SS.isInvalid()) { 3574 Name = 0; 3575 goto CreateNewDecl; 3576 } 3577 3578 if (RequireCompleteDeclContext(SS)) 3579 return DeclPtrTy::make((Decl *)0); 3580 3581 DC = computeDeclContext(SS, true); 3582 SearchDC = DC; 3583 // Look-up name inside 'foo::'. 3584 PrevDecl 3585 = dyn_cast_or_null<TagDecl>( 3586 LookupQualifiedName(DC, Name, LookupTagName, true).getAsDecl()); 3587 3588 // A tag 'foo::bar' must already exist. 3589 if (PrevDecl == 0) { 3590 Diag(NameLoc, diag::err_not_tag_in_scope) << Name << SS.getRange(); 3591 Name = 0; 3592 Invalid = true; 3593 goto CreateNewDecl; 3594 } 3595 } else if (Name) { 3596 // If this is a named struct, check to see if there was a previous forward 3597 // declaration or definition. 3598 // FIXME: We're looking into outer scopes here, even when we 3599 // shouldn't be. Doing so can result in ambiguities that we 3600 // shouldn't be diagnosing. 3601 LookupResult R = LookupName(S, Name, LookupTagName, 3602 /*RedeclarationOnly=*/(TK != TK_Reference)); 3603 if (R.isAmbiguous()) { 3604 DiagnoseAmbiguousLookup(R, Name, NameLoc); 3605 // FIXME: This is not best way to recover from case like: 3606 // 3607 // struct S s; 3608 // 3609 // causes needless "incomplete type" error later. 3610 Name = 0; 3611 PrevDecl = 0; 3612 Invalid = true; 3613 } 3614 else 3615 PrevDecl = R; 3616 3617 if (!getLangOptions().CPlusPlus && TK != TK_Reference) { 3618 // FIXME: This makes sure that we ignore the contexts associated 3619 // with C structs, unions, and enums when looking for a matching 3620 // tag declaration or definition. See the similar lookup tweak 3621 // in Sema::LookupName; is there a better way to deal with this? 3622 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 3623 SearchDC = SearchDC->getParent(); 3624 } 3625 } 3626 3627 if (PrevDecl && PrevDecl->isTemplateParameter()) { 3628 // Maybe we will complain about the shadowed template parameter. 3629 DiagnoseTemplateParameterShadow(NameLoc, PrevDecl); 3630 // Just pretend that we didn't see the previous declaration. 3631 PrevDecl = 0; 3632 } 3633 3634 if (PrevDecl) { 3635 // Check whether the previous declaration is usable. 3636 (void)DiagnoseUseOfDecl(PrevDecl, NameLoc); 3637 3638 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 3639 // If this is a use of a previous tag, or if the tag is already declared 3640 // in the same scope (so that the definition/declaration completes or 3641 // rementions the tag), reuse the decl. 3642 if (TK == TK_Reference || isDeclInScope(PrevDecl, SearchDC, S)) { 3643 // Make sure that this wasn't declared as an enum and now used as a 3644 // struct or something similar. 3645 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, KWLoc, *Name)) { 3646 bool SafeToContinue 3647 = (PrevTagDecl->getTagKind() != TagDecl::TK_enum && 3648 Kind != TagDecl::TK_enum); 3649 if (SafeToContinue) 3650 Diag(KWLoc, diag::err_use_with_wrong_tag) 3651 << Name 3652 << CodeModificationHint::CreateReplacement(SourceRange(KWLoc), 3653 PrevTagDecl->getKindName()); 3654 else 3655 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 3656 Diag(PrevDecl->getLocation(), diag::note_previous_use); 3657 3658 if (SafeToContinue) 3659 Kind = PrevTagDecl->getTagKind(); 3660 else { 3661 // Recover by making this an anonymous redefinition. 3662 Name = 0; 3663 PrevDecl = 0; 3664 Invalid = true; 3665 } 3666 } 3667 3668 if (!Invalid) { 3669 // If this is a use, just return the declaration we found. 3670 3671 // FIXME: In the future, return a variant or some other clue 3672 // for the consumer of this Decl to know it doesn't own it. 3673 // For our current ASTs this shouldn't be a problem, but will 3674 // need to be changed with DeclGroups. 3675 if (TK == TK_Reference) 3676 return DeclPtrTy::make(PrevDecl); 3677 3678 // Diagnose attempts to redefine a tag. 3679 if (TK == TK_Definition) { 3680 if (TagDecl *Def = PrevTagDecl->getDefinition(Context)) { 3681 Diag(NameLoc, diag::err_redefinition) << Name; 3682 Diag(Def->getLocation(), diag::note_previous_definition); 3683 // If this is a redefinition, recover by making this 3684 // struct be anonymous, which will make any later 3685 // references get the previous definition. 3686 Name = 0; 3687 PrevDecl = 0; 3688 Invalid = true; 3689 } else { 3690 // If the type is currently being defined, complain 3691 // about a nested redefinition. 3692 TagType *Tag = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 3693 if (Tag->isBeingDefined()) { 3694 Diag(NameLoc, diag::err_nested_redefinition) << Name; 3695 Diag(PrevTagDecl->getLocation(), 3696 diag::note_previous_definition); 3697 Name = 0; 3698 PrevDecl = 0; 3699 Invalid = true; 3700 } 3701 } 3702 3703 // Okay, this is definition of a previously declared or referenced 3704 // tag PrevDecl. We're going to create a new Decl for it. 3705 } 3706 } 3707 // If we get here we have (another) forward declaration or we 3708 // have a definition. Just create a new decl. 3709 } else { 3710 // If we get here, this is a definition of a new tag type in a nested 3711 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 3712 // new decl/type. We set PrevDecl to NULL so that the entities 3713 // have distinct types. 3714 PrevDecl = 0; 3715 } 3716 // If we get here, we're going to create a new Decl. If PrevDecl 3717 // is non-NULL, it's a definition of the tag declared by 3718 // PrevDecl. If it's NULL, we have a new definition. 3719 } else { 3720 // PrevDecl is a namespace, template, or anything else 3721 // that lives in the IDNS_Tag identifier namespace. 3722 if (isDeclInScope(PrevDecl, SearchDC, S)) { 3723 // The tag name clashes with a namespace name, issue an error and 3724 // recover by making this tag be anonymous. 3725 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 3726 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3727 Name = 0; 3728 PrevDecl = 0; 3729 Invalid = true; 3730 } else { 3731 // The existing declaration isn't relevant to us; we're in a 3732 // new scope, so clear out the previous declaration. 3733 PrevDecl = 0; 3734 } 3735 } 3736 } else if (TK == TK_Reference && SS.isEmpty() && Name && 3737 (Kind != TagDecl::TK_enum || !getLangOptions().CPlusPlus)) { 3738 // C++ [basic.scope.pdecl]p5: 3739 // -- for an elaborated-type-specifier of the form 3740 // 3741 // class-key identifier 3742 // 3743 // if the elaborated-type-specifier is used in the 3744 // decl-specifier-seq or parameter-declaration-clause of a 3745 // function defined in namespace scope, the identifier is 3746 // declared as a class-name in the namespace that contains 3747 // the declaration; otherwise, except as a friend 3748 // declaration, the identifier is declared in the smallest 3749 // non-class, non-function-prototype scope that contains the 3750 // declaration. 3751 // 3752 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 3753 // C structs and unions. 3754 // 3755 // GNU C also supports this behavior as part of its incomplete 3756 // enum types extension, while GNU C++ does not. 3757 // 3758 // Find the context where we'll be declaring the tag. 3759 // FIXME: We would like to maintain the current DeclContext as the 3760 // lexical context, 3761 while (SearchDC->isRecord()) 3762 SearchDC = SearchDC->getParent(); 3763 3764 // Find the scope where we'll be declaring the tag. 3765 while (S->isClassScope() || 3766 (getLangOptions().CPlusPlus && S->isFunctionPrototypeScope()) || 3767 ((S->getFlags() & Scope::DeclScope) == 0) || 3768 (S->getEntity() && 3769 ((DeclContext *)S->getEntity())->isTransparentContext())) 3770 S = S->getParent(); 3771 } 3772 3773CreateNewDecl: 3774 3775 // If there is an identifier, use the location of the identifier as the 3776 // location of the decl, otherwise use the location of the struct/union 3777 // keyword. 3778 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 3779 3780 // Otherwise, create a new declaration. If there is a previous 3781 // declaration of the same entity, the two will be linked via 3782 // PrevDecl. 3783 TagDecl *New; 3784 3785 if (Kind == TagDecl::TK_enum) { 3786 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 3787 // enum X { A, B, C } D; D should chain to X. 3788 New = EnumDecl::Create(Context, SearchDC, Loc, Name, KWLoc, 3789 cast_or_null<EnumDecl>(PrevDecl)); 3790 // If this is an undefined enum, warn. 3791 if (TK != TK_Definition && !Invalid) { 3792 unsigned DK = getLangOptions().CPlusPlus? diag::err_forward_ref_enum 3793 : diag::ext_forward_ref_enum; 3794 Diag(Loc, DK); 3795 } 3796 } else { 3797 // struct/union/class 3798 3799 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 3800 // struct X { int A; } D; D should chain to X. 3801 if (getLangOptions().CPlusPlus) 3802 // FIXME: Look for a way to use RecordDecl for simple structs. 3803 New = CXXRecordDecl::Create(Context, Kind, SearchDC, Loc, Name, KWLoc, 3804 cast_or_null<CXXRecordDecl>(PrevDecl)); 3805 else 3806 New = RecordDecl::Create(Context, Kind, SearchDC, Loc, Name, KWLoc, 3807 cast_or_null<RecordDecl>(PrevDecl)); 3808 } 3809 3810 if (Kind != TagDecl::TK_enum) { 3811 // Handle #pragma pack: if the #pragma pack stack has non-default 3812 // alignment, make up a packed attribute for this decl. These 3813 // attributes are checked when the ASTContext lays out the 3814 // structure. 3815 // 3816 // It is important for implementing the correct semantics that this 3817 // happen here (in act on tag decl). The #pragma pack stack is 3818 // maintained as a result of parser callbacks which can occur at 3819 // many points during the parsing of a struct declaration (because 3820 // the #pragma tokens are effectively skipped over during the 3821 // parsing of the struct). 3822 if (unsigned Alignment = getPragmaPackAlignment()) 3823 New->addAttr(::new (Context) PackedAttr(Alignment * 8)); 3824 } 3825 3826 if (getLangOptions().CPlusPlus && SS.isEmpty() && Name && !Invalid) { 3827 // C++ [dcl.typedef]p3: 3828 // [...] Similarly, in a given scope, a class or enumeration 3829 // shall not be declared with the same name as a typedef-name 3830 // that is declared in that scope and refers to a type other 3831 // than the class or enumeration itself. 3832 LookupResult Lookup = LookupName(S, Name, LookupOrdinaryName, true); 3833 TypedefDecl *PrevTypedef = 0; 3834 if (Lookup.getKind() == LookupResult::Found) 3835 PrevTypedef = dyn_cast<TypedefDecl>(Lookup.getAsDecl()); 3836 3837 if (PrevTypedef && isDeclInScope(PrevTypedef, SearchDC, S) && 3838 Context.getCanonicalType(Context.getTypeDeclType(PrevTypedef)) != 3839 Context.getCanonicalType(Context.getTypeDeclType(New))) { 3840 Diag(Loc, diag::err_tag_definition_of_typedef) 3841 << Context.getTypeDeclType(New) 3842 << PrevTypedef->getUnderlyingType(); 3843 Diag(PrevTypedef->getLocation(), diag::note_previous_definition); 3844 Invalid = true; 3845 } 3846 } 3847 3848 if (Invalid) 3849 New->setInvalidDecl(); 3850 3851 if (Attr) 3852 ProcessDeclAttributeList(S, New, Attr); 3853 3854 // If we're declaring or defining a tag in function prototype scope 3855 // in C, note that this type can only be used within the function. 3856 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 3857 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 3858 3859 // Set the lexical context. If the tag has a C++ scope specifier, the 3860 // lexical context will be different from the semantic context. 3861 New->setLexicalDeclContext(CurContext); 3862 3863 // Set the access specifier. 3864 if (!Invalid) 3865 SetMemberAccessSpecifier(New, PrevDecl, AS); 3866 3867 if (TK == TK_Definition) 3868 New->startDefinition(); 3869 3870 // If this has an identifier, add it to the scope stack. 3871 if (Name) { 3872 S = getNonFieldDeclScope(S); 3873 PushOnScopeChains(New, S); 3874 } else { 3875 CurContext->addDecl(New); 3876 } 3877 3878 // If this is the C FILE type, notify the AST context. 3879 if (IdentifierInfo *II = New->getIdentifier()) 3880 if (!New->isInvalidDecl() && 3881 New->getDeclContext()->getLookupContext()->isTranslationUnit() && 3882 II->isStr("FILE")) 3883 Context.setFILEDecl(New); 3884 3885 OwnedDecl = true; 3886 return DeclPtrTy::make(New); 3887} 3888 3889void Sema::ActOnTagStartDefinition(Scope *S, DeclPtrTy TagD) { 3890 AdjustDeclIfTemplate(TagD); 3891 TagDecl *Tag = cast<TagDecl>(TagD.getAs<Decl>()); 3892 3893 // Enter the tag context. 3894 PushDeclContext(S, Tag); 3895 3896 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Tag)) { 3897 FieldCollector->StartClass(); 3898 3899 if (Record->getIdentifier()) { 3900 // C++ [class]p2: 3901 // [...] The class-name is also inserted into the scope of the 3902 // class itself; this is known as the injected-class-name. For 3903 // purposes of access checking, the injected-class-name is treated 3904 // as if it were a public member name. 3905 CXXRecordDecl *InjectedClassName 3906 = CXXRecordDecl::Create(Context, Record->getTagKind(), 3907 CurContext, Record->getLocation(), 3908 Record->getIdentifier(), 3909 Record->getTagKeywordLoc(), 3910 Record); 3911 InjectedClassName->setImplicit(); 3912 InjectedClassName->setAccess(AS_public); 3913 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 3914 InjectedClassName->setDescribedClassTemplate(Template); 3915 PushOnScopeChains(InjectedClassName, S); 3916 assert(InjectedClassName->isInjectedClassName() && 3917 "Broken injected-class-name"); 3918 } 3919 } 3920} 3921 3922void Sema::ActOnTagFinishDefinition(Scope *S, DeclPtrTy TagD, 3923 SourceLocation RBraceLoc) { 3924 AdjustDeclIfTemplate(TagD); 3925 TagDecl *Tag = cast<TagDecl>(TagD.getAs<Decl>()); 3926 Tag->setRBraceLoc(RBraceLoc); 3927 3928 if (isa<CXXRecordDecl>(Tag)) 3929 FieldCollector->FinishClass(); 3930 3931 // Exit this scope of this tag's definition. 3932 PopDeclContext(); 3933 3934 // Notify the consumer that we've defined a tag. 3935 Consumer.HandleTagDeclDefinition(Tag); 3936} 3937 3938// Note that FieldName may be null for anonymous bitfields. 3939bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName, 3940 QualType FieldTy, const Expr *BitWidth) { 3941 3942 // C99 6.7.2.1p4 - verify the field type. 3943 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 3944 if (!FieldTy->isDependentType() && !FieldTy->isIntegralType()) { 3945 // Handle incomplete types with specific error. 3946 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 3947 return true; 3948 if (FieldName) 3949 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 3950 << FieldName << FieldTy << BitWidth->getSourceRange(); 3951 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) 3952 << FieldTy << BitWidth->getSourceRange(); 3953 } 3954 3955 // If the bit-width is type- or value-dependent, don't try to check 3956 // it now. 3957 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 3958 return false; 3959 3960 llvm::APSInt Value; 3961 if (VerifyIntegerConstantExpression(BitWidth, &Value)) 3962 return true; 3963 3964 // Zero-width bitfield is ok for anonymous field. 3965 if (Value == 0 && FieldName) 3966 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 3967 3968 if (Value.isSigned() && Value.isNegative()) { 3969 if (FieldName) 3970 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 3971 << FieldName << Value.toString(10); 3972 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) 3973 << Value.toString(10); 3974 } 3975 3976 if (!FieldTy->isDependentType()) { 3977 uint64_t TypeSize = Context.getTypeSize(FieldTy); 3978 if (Value.getZExtValue() > TypeSize) { 3979 if (FieldName) 3980 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 3981 << FieldName << (unsigned)TypeSize; 3982 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) 3983 << (unsigned)TypeSize; 3984 } 3985 } 3986 3987 return false; 3988} 3989 3990/// ActOnField - Each field of a struct/union/class is passed into this in order 3991/// to create a FieldDecl object for it. 3992Sema::DeclPtrTy Sema::ActOnField(Scope *S, DeclPtrTy TagD, 3993 SourceLocation DeclStart, 3994 Declarator &D, ExprTy *BitfieldWidth) { 3995 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD.getAs<Decl>()), 3996 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 3997 AS_public); 3998 return DeclPtrTy::make(Res); 3999} 4000 4001/// HandleField - Analyze a field of a C struct or a C++ data member. 4002/// 4003FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 4004 SourceLocation DeclStart, 4005 Declarator &D, Expr *BitWidth, 4006 AccessSpecifier AS) { 4007 IdentifierInfo *II = D.getIdentifier(); 4008 SourceLocation Loc = DeclStart; 4009 if (II) Loc = D.getIdentifierLoc(); 4010 4011 QualType T = GetTypeForDeclarator(D, S); 4012 if (getLangOptions().CPlusPlus) 4013 CheckExtraCXXDefaultArguments(D); 4014 4015 DiagnoseFunctionSpecifiers(D); 4016 4017 if (D.getDeclSpec().isThreadSpecified()) 4018 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 4019 4020 NamedDecl *PrevDecl = LookupName(S, II, LookupMemberName, true); 4021 4022 if (PrevDecl && PrevDecl->isTemplateParameter()) { 4023 // Maybe we will complain about the shadowed template parameter. 4024 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 4025 // Just pretend that we didn't see the previous declaration. 4026 PrevDecl = 0; 4027 } 4028 4029 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 4030 PrevDecl = 0; 4031 4032 bool Mutable 4033 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable); 4034 SourceLocation TSSL = D.getSourceRange().getBegin(); 4035 FieldDecl *NewFD 4036 = CheckFieldDecl(II, T, Record, Loc, Mutable, BitWidth, TSSL, 4037 AS, PrevDecl, &D); 4038 if (NewFD->isInvalidDecl() && PrevDecl) { 4039 // Don't introduce NewFD into scope; there's already something 4040 // with the same name in the same scope. 4041 } else if (II) { 4042 PushOnScopeChains(NewFD, S); 4043 } else 4044 Record->addDecl(NewFD); 4045 4046 return NewFD; 4047} 4048 4049/// \brief Build a new FieldDecl and check its well-formedness. 4050/// 4051/// This routine builds a new FieldDecl given the fields name, type, 4052/// record, etc. \p PrevDecl should refer to any previous declaration 4053/// with the same name and in the same scope as the field to be 4054/// created. 4055/// 4056/// \returns a new FieldDecl. 4057/// 4058/// \todo The Declarator argument is a hack. It will be removed once 4059FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 4060 RecordDecl *Record, SourceLocation Loc, 4061 bool Mutable, Expr *BitWidth, 4062 SourceLocation TSSL, 4063 AccessSpecifier AS, NamedDecl *PrevDecl, 4064 Declarator *D) { 4065 IdentifierInfo *II = Name.getAsIdentifierInfo(); 4066 bool InvalidDecl = false; 4067 if (D) InvalidDecl = D->isInvalidType(); 4068 4069 // If we receive a broken type, recover by assuming 'int' and 4070 // marking this declaration as invalid. 4071 if (T.isNull()) { 4072 InvalidDecl = true; 4073 T = Context.IntTy; 4074 } 4075 4076 // C99 6.7.2.1p8: A member of a structure or union may have any type other 4077 // than a variably modified type. 4078 if (T->isVariablyModifiedType()) { 4079 bool SizeIsNegative; 4080 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 4081 SizeIsNegative); 4082 if (!FixedTy.isNull()) { 4083 Diag(Loc, diag::warn_illegal_constant_array_size); 4084 T = FixedTy; 4085 } else { 4086 if (SizeIsNegative) 4087 Diag(Loc, diag::err_typecheck_negative_array_size); 4088 else 4089 Diag(Loc, diag::err_typecheck_field_variable_size); 4090 InvalidDecl = true; 4091 } 4092 } 4093 4094 // Fields can not have abstract class types 4095 if (RequireNonAbstractType(Loc, T, diag::err_abstract_type_in_decl, 4096 AbstractFieldType)) 4097 InvalidDecl = true; 4098 4099 // If this is declared as a bit-field, check the bit-field. 4100 if (BitWidth && VerifyBitField(Loc, II, T, BitWidth)) { 4101 InvalidDecl = true; 4102 DeleteExpr(BitWidth); 4103 BitWidth = 0; 4104 } 4105 4106 FieldDecl *NewFD = FieldDecl::Create(Context, Record, Loc, II, T, BitWidth, 4107 Mutable, TSSL); 4108 if (InvalidDecl) 4109 NewFD->setInvalidDecl(); 4110 4111 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 4112 Diag(Loc, diag::err_duplicate_member) << II; 4113 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 4114 NewFD->setInvalidDecl(); 4115 } 4116 4117 if (getLangOptions().CPlusPlus) { 4118 QualType EltTy = T; 4119 while (const ArrayType *AT = Context.getAsArrayType(EltTy)) 4120 EltTy = AT->getElementType(); 4121 4122 if (const RecordType *RT = EltTy->getAsRecordType()) { 4123 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 4124 4125 if (!RDecl->hasTrivialConstructor()) 4126 cast<CXXRecordDecl>(Record)->setHasTrivialConstructor(false); 4127 if (!RDecl->hasTrivialCopyConstructor()) 4128 cast<CXXRecordDecl>(Record)->setHasTrivialCopyConstructor(false); 4129 if (!RDecl->hasTrivialCopyAssignment()) 4130 cast<CXXRecordDecl>(Record)->setHasTrivialCopyAssignment(false); 4131 if (!RDecl->hasTrivialDestructor()) 4132 cast<CXXRecordDecl>(Record)->setHasTrivialDestructor(false); 4133 4134 // C++ 9.5p1: An object of a class with a non-trivial 4135 // constructor, a non-trivial copy constructor, a non-trivial 4136 // destructor, or a non-trivial copy assignment operator 4137 // cannot be a member of a union, nor can an array of such 4138 // objects. 4139 // TODO: C++0x alters this restriction significantly. 4140 if (Record->isUnion()) { 4141 // We check for copy constructors before constructors 4142 // because otherwise we'll never get complaints about 4143 // copy constructors. 4144 4145 const CXXSpecialMember invalid = (CXXSpecialMember) -1; 4146 4147 CXXSpecialMember member; 4148 if (!RDecl->hasTrivialCopyConstructor()) 4149 member = CXXCopyConstructor; 4150 else if (!RDecl->hasTrivialConstructor()) 4151 member = CXXDefaultConstructor; 4152 else if (!RDecl->hasTrivialCopyAssignment()) 4153 member = CXXCopyAssignment; 4154 else if (!RDecl->hasTrivialDestructor()) 4155 member = CXXDestructor; 4156 else 4157 member = invalid; 4158 4159 if (member != invalid) { 4160 Diag(Loc, diag::err_illegal_union_member) << Name << member; 4161 DiagnoseNontrivial(RT, member); 4162 NewFD->setInvalidDecl(); 4163 } 4164 } 4165 } 4166 } 4167 4168 if (getLangOptions().CPlusPlus && !T->isPODType()) 4169 cast<CXXRecordDecl>(Record)->setPOD(false); 4170 4171 // FIXME: We need to pass in the attributes given an AST 4172 // representation, not a parser representation. 4173 if (D) 4174 // FIXME: What to pass instead of TUScope? 4175 ProcessDeclAttributes(TUScope, NewFD, *D); 4176 4177 if (T.isObjCGCWeak()) 4178 Diag(Loc, diag::warn_attribute_weak_on_field); 4179 4180 NewFD->setAccess(AS); 4181 4182 // C++ [dcl.init.aggr]p1: 4183 // An aggregate is an array or a class (clause 9) with [...] no 4184 // private or protected non-static data members (clause 11). 4185 // A POD must be an aggregate. 4186 if (getLangOptions().CPlusPlus && 4187 (AS == AS_private || AS == AS_protected)) { 4188 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record); 4189 CXXRecord->setAggregate(false); 4190 CXXRecord->setPOD(false); 4191 } 4192 4193 return NewFD; 4194} 4195 4196/// DiagnoseNontrivial - Given that a class has a non-trivial 4197/// special member, figure out why. 4198void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) { 4199 QualType QT(T, 0U); 4200 CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl()); 4201 4202 // Check whether the member was user-declared. 4203 switch (member) { 4204 case CXXDefaultConstructor: 4205 if (RD->hasUserDeclaredConstructor()) { 4206 typedef CXXRecordDecl::ctor_iterator ctor_iter; 4207 for (ctor_iter ci = RD->ctor_begin(), ce = RD->ctor_end(); ci != ce; ++ci) 4208 if (!ci->isImplicitlyDefined(Context)) { 4209 SourceLocation CtorLoc = ci->getLocation(); 4210 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 4211 return; 4212 } 4213 4214 assert(0 && "found no user-declared constructors"); 4215 return; 4216 } 4217 break; 4218 4219 case CXXCopyConstructor: 4220 if (RD->hasUserDeclaredCopyConstructor()) { 4221 SourceLocation CtorLoc = 4222 RD->getCopyConstructor(Context, 0)->getLocation(); 4223 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 4224 return; 4225 } 4226 break; 4227 4228 case CXXCopyAssignment: 4229 if (RD->hasUserDeclaredCopyAssignment()) { 4230 // FIXME: this should use the location of the copy 4231 // assignment, not the type. 4232 SourceLocation TyLoc = RD->getSourceRange().getBegin(); 4233 Diag(TyLoc, diag::note_nontrivial_user_defined) << QT << member; 4234 return; 4235 } 4236 break; 4237 4238 case CXXDestructor: 4239 if (RD->hasUserDeclaredDestructor()) { 4240 SourceLocation DtorLoc = RD->getDestructor(Context)->getLocation(); 4241 Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member; 4242 return; 4243 } 4244 break; 4245 } 4246 4247 typedef CXXRecordDecl::base_class_iterator base_iter; 4248 4249 // Virtual bases and members inhibit trivial copying/construction, 4250 // but not trivial destruction. 4251 if (member != CXXDestructor) { 4252 // Check for virtual bases. vbases includes indirect virtual bases, 4253 // so we just iterate through the direct bases. 4254 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) 4255 if (bi->isVirtual()) { 4256 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 4257 Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1; 4258 return; 4259 } 4260 4261 // Check for virtual methods. 4262 typedef CXXRecordDecl::method_iterator meth_iter; 4263 for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me; 4264 ++mi) { 4265 if (mi->isVirtual()) { 4266 SourceLocation MLoc = mi->getSourceRange().getBegin(); 4267 Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0; 4268 return; 4269 } 4270 } 4271 } 4272 4273 bool (CXXRecordDecl::*hasTrivial)() const; 4274 switch (member) { 4275 case CXXDefaultConstructor: 4276 hasTrivial = &CXXRecordDecl::hasTrivialConstructor; break; 4277 case CXXCopyConstructor: 4278 hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break; 4279 case CXXCopyAssignment: 4280 hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break; 4281 case CXXDestructor: 4282 hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break; 4283 default: 4284 assert(0 && "unexpected special member"); return; 4285 } 4286 4287 // Check for nontrivial bases (and recurse). 4288 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) { 4289 const RecordType *BaseRT = bi->getType()->getAsRecordType(); 4290 assert(BaseRT); 4291 CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl()); 4292 if (!(BaseRecTy->*hasTrivial)()) { 4293 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 4294 Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member; 4295 DiagnoseNontrivial(BaseRT, member); 4296 return; 4297 } 4298 } 4299 4300 // Check for nontrivial members (and recurse). 4301 typedef RecordDecl::field_iterator field_iter; 4302 for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe; 4303 ++fi) { 4304 QualType EltTy = (*fi)->getType(); 4305 while (const ArrayType *AT = Context.getAsArrayType(EltTy)) 4306 EltTy = AT->getElementType(); 4307 4308 if (const RecordType *EltRT = EltTy->getAsRecordType()) { 4309 CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl()); 4310 4311 if (!(EltRD->*hasTrivial)()) { 4312 SourceLocation FLoc = (*fi)->getLocation(); 4313 Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member; 4314 DiagnoseNontrivial(EltRT, member); 4315 return; 4316 } 4317 } 4318 } 4319 4320 assert(0 && "found no explanation for non-trivial member"); 4321} 4322 4323/// TranslateIvarVisibility - Translate visibility from a token ID to an 4324/// AST enum value. 4325static ObjCIvarDecl::AccessControl 4326TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 4327 switch (ivarVisibility) { 4328 default: assert(0 && "Unknown visitibility kind"); 4329 case tok::objc_private: return ObjCIvarDecl::Private; 4330 case tok::objc_public: return ObjCIvarDecl::Public; 4331 case tok::objc_protected: return ObjCIvarDecl::Protected; 4332 case tok::objc_package: return ObjCIvarDecl::Package; 4333 } 4334} 4335 4336/// ActOnIvar - Each ivar field of an objective-c class is passed into this 4337/// in order to create an IvarDecl object for it. 4338Sema::DeclPtrTy Sema::ActOnIvar(Scope *S, 4339 SourceLocation DeclStart, 4340 DeclPtrTy IntfDecl, 4341 Declarator &D, ExprTy *BitfieldWidth, 4342 tok::ObjCKeywordKind Visibility) { 4343 4344 IdentifierInfo *II = D.getIdentifier(); 4345 Expr *BitWidth = (Expr*)BitfieldWidth; 4346 SourceLocation Loc = DeclStart; 4347 if (II) Loc = D.getIdentifierLoc(); 4348 4349 // FIXME: Unnamed fields can be handled in various different ways, for 4350 // example, unnamed unions inject all members into the struct namespace! 4351 4352 QualType T = GetTypeForDeclarator(D, S); 4353 4354 if (BitWidth) { 4355 // 6.7.2.1p3, 6.7.2.1p4 4356 if (VerifyBitField(Loc, II, T, BitWidth)) { 4357 D.setInvalidType(); 4358 DeleteExpr(BitWidth); 4359 BitWidth = 0; 4360 } 4361 } else { 4362 // Not a bitfield. 4363 4364 // validate II. 4365 4366 } 4367 4368 // C99 6.7.2.1p8: A member of a structure or union may have any type other 4369 // than a variably modified type. 4370 if (T->isVariablyModifiedType()) { 4371 Diag(Loc, diag::err_typecheck_ivar_variable_size); 4372 D.setInvalidType(); 4373 } 4374 4375 // Get the visibility (access control) for this ivar. 4376 ObjCIvarDecl::AccessControl ac = 4377 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 4378 : ObjCIvarDecl::None; 4379 // Must set ivar's DeclContext to its enclosing interface. 4380 Decl *EnclosingDecl = IntfDecl.getAs<Decl>(); 4381 DeclContext *EnclosingContext; 4382 if (ObjCImplementationDecl *IMPDecl = 4383 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 4384 // Case of ivar declared in an implementation. Context is that of its class. 4385 ObjCInterfaceDecl* IDecl = IMPDecl->getClassInterface(); 4386 assert(IDecl && "No class- ActOnIvar"); 4387 EnclosingContext = cast_or_null<DeclContext>(IDecl); 4388 } 4389 else 4390 EnclosingContext = dyn_cast<DeclContext>(EnclosingDecl); 4391 assert(EnclosingContext && "null DeclContext for ivar - ActOnIvar"); 4392 4393 // Construct the decl. 4394 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, 4395 EnclosingContext, Loc, II, T,ac, 4396 (Expr *)BitfieldWidth); 4397 4398 if (II) { 4399 NamedDecl *PrevDecl = LookupName(S, II, LookupMemberName, true); 4400 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S) 4401 && !isa<TagDecl>(PrevDecl)) { 4402 Diag(Loc, diag::err_duplicate_member) << II; 4403 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 4404 NewID->setInvalidDecl(); 4405 } 4406 } 4407 4408 // Process attributes attached to the ivar. 4409 ProcessDeclAttributes(S, NewID, D); 4410 4411 if (D.isInvalidType()) 4412 NewID->setInvalidDecl(); 4413 4414 if (II) { 4415 // FIXME: When interfaces are DeclContexts, we'll need to add 4416 // these to the interface. 4417 S->AddDecl(DeclPtrTy::make(NewID)); 4418 IdResolver.AddDecl(NewID); 4419 } 4420 4421 return DeclPtrTy::make(NewID); 4422} 4423 4424void Sema::ActOnFields(Scope* S, 4425 SourceLocation RecLoc, DeclPtrTy RecDecl, 4426 DeclPtrTy *Fields, unsigned NumFields, 4427 SourceLocation LBrac, SourceLocation RBrac, 4428 AttributeList *Attr) { 4429 Decl *EnclosingDecl = RecDecl.getAs<Decl>(); 4430 assert(EnclosingDecl && "missing record or interface decl"); 4431 4432 // If the decl this is being inserted into is invalid, then it may be a 4433 // redeclaration or some other bogus case. Don't try to add fields to it. 4434 if (EnclosingDecl->isInvalidDecl()) { 4435 // FIXME: Deallocate fields? 4436 return; 4437 } 4438 4439 4440 // Verify that all the fields are okay. 4441 unsigned NumNamedMembers = 0; 4442 llvm::SmallVector<FieldDecl*, 32> RecFields; 4443 4444 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 4445 for (unsigned i = 0; i != NumFields; ++i) { 4446 FieldDecl *FD = cast<FieldDecl>(Fields[i].getAs<Decl>()); 4447 4448 // Get the type for the field. 4449 Type *FDTy = FD->getType().getTypePtr(); 4450 4451 if (!FD->isAnonymousStructOrUnion()) { 4452 // Remember all fields written by the user. 4453 RecFields.push_back(FD); 4454 } 4455 4456 // If the field is already invalid for some reason, don't emit more 4457 // diagnostics about it. 4458 if (FD->isInvalidDecl()) 4459 continue; 4460 4461 // C99 6.7.2.1p2: 4462 // A structure or union shall not contain a member with 4463 // incomplete or function type (hence, a structure shall not 4464 // contain an instance of itself, but may contain a pointer to 4465 // an instance of itself), except that the last member of a 4466 // structure with more than one named member may have incomplete 4467 // array type; such a structure (and any union containing, 4468 // possibly recursively, a member that is such a structure) 4469 // shall not be a member of a structure or an element of an 4470 // array. 4471 if (FDTy->isFunctionType()) { 4472 // Field declared as a function. 4473 Diag(FD->getLocation(), diag::err_field_declared_as_function) 4474 << FD->getDeclName(); 4475 FD->setInvalidDecl(); 4476 EnclosingDecl->setInvalidDecl(); 4477 continue; 4478 } else if (FDTy->isIncompleteArrayType() && i == NumFields - 1 && 4479 Record && Record->isStruct()) { 4480 // Flexible array member. 4481 if (NumNamedMembers < 1) { 4482 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 4483 << FD->getDeclName(); 4484 FD->setInvalidDecl(); 4485 EnclosingDecl->setInvalidDecl(); 4486 continue; 4487 } 4488 // Okay, we have a legal flexible array member at the end of the struct. 4489 if (Record) 4490 Record->setHasFlexibleArrayMember(true); 4491 } else if (!FDTy->isDependentType() && 4492 RequireCompleteType(FD->getLocation(), FD->getType(), 4493 diag::err_field_incomplete)) { 4494 // Incomplete type 4495 FD->setInvalidDecl(); 4496 EnclosingDecl->setInvalidDecl(); 4497 continue; 4498 } else if (const RecordType *FDTTy = FDTy->getAsRecordType()) { 4499 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 4500 // If this is a member of a union, then entire union becomes "flexible". 4501 if (Record && Record->isUnion()) { 4502 Record->setHasFlexibleArrayMember(true); 4503 } else { 4504 // If this is a struct/class and this is not the last element, reject 4505 // it. Note that GCC supports variable sized arrays in the middle of 4506 // structures. 4507 if (i != NumFields-1) 4508 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 4509 << FD->getDeclName() << FD->getType(); 4510 else { 4511 // We support flexible arrays at the end of structs in 4512 // other structs as an extension. 4513 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 4514 << FD->getDeclName(); 4515 if (Record) 4516 Record->setHasFlexibleArrayMember(true); 4517 } 4518 } 4519 } 4520 if (Record && FDTTy->getDecl()->hasObjectMember()) 4521 Record->setHasObjectMember(true); 4522 } else if (FDTy->isObjCInterfaceType()) { 4523 /// A field cannot be an Objective-c object 4524 Diag(FD->getLocation(), diag::err_statically_allocated_object); 4525 FD->setInvalidDecl(); 4526 EnclosingDecl->setInvalidDecl(); 4527 continue; 4528 } 4529 else if (getLangOptions().ObjC1 && 4530 getLangOptions().getGCMode() != LangOptions::NonGC && 4531 Record && 4532 (FD->getType()->isObjCObjectPointerType() || 4533 FD->getType().isObjCGCStrong())) 4534 Record->setHasObjectMember(true); 4535 // Keep track of the number of named members. 4536 if (FD->getIdentifier()) 4537 ++NumNamedMembers; 4538 } 4539 4540 // Okay, we successfully defined 'Record'. 4541 if (Record) { 4542 Record->completeDefinition(Context); 4543 } else { 4544 ObjCIvarDecl **ClsFields = 4545 reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); 4546 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 4547 ID->setIVarList(ClsFields, RecFields.size(), Context); 4548 ID->setLocEnd(RBrac); 4549 // Add ivar's to class's DeclContext. 4550 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 4551 ClsFields[i]->setLexicalDeclContext(ID); 4552 ID->addDecl(ClsFields[i]); 4553 } 4554 // Must enforce the rule that ivars in the base classes may not be 4555 // duplicates. 4556 if (ID->getSuperClass()) { 4557 for (ObjCInterfaceDecl::ivar_iterator IVI = ID->ivar_begin(), 4558 IVE = ID->ivar_end(); IVI != IVE; ++IVI) { 4559 ObjCIvarDecl* Ivar = (*IVI); 4560 4561 if (IdentifierInfo *II = Ivar->getIdentifier()) { 4562 ObjCIvarDecl* prevIvar = 4563 ID->getSuperClass()->lookupInstanceVariable(II); 4564 if (prevIvar) { 4565 Diag(Ivar->getLocation(), diag::err_duplicate_member) << II; 4566 Diag(prevIvar->getLocation(), diag::note_previous_declaration); 4567 } 4568 } 4569 } 4570 } 4571 } else if (ObjCImplementationDecl *IMPDecl = 4572 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 4573 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 4574 for (unsigned I = 0, N = RecFields.size(); I != N; ++I) 4575 // Ivar declared in @implementation never belongs to the implementation. 4576 // Only it is in implementation's lexical context. 4577 ClsFields[I]->setLexicalDeclContext(IMPDecl); 4578 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 4579 } 4580 } 4581 4582 if (Attr) 4583 ProcessDeclAttributeList(S, Record, Attr); 4584} 4585 4586EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 4587 EnumConstantDecl *LastEnumConst, 4588 SourceLocation IdLoc, 4589 IdentifierInfo *Id, 4590 ExprArg val) { 4591 Expr *Val = (Expr *)val.get(); 4592 4593 llvm::APSInt EnumVal(32); 4594 QualType EltTy; 4595 if (Val && !Val->isTypeDependent()) { 4596 // Make sure to promote the operand type to int. 4597 UsualUnaryConversions(Val); 4598 if (Val != val.get()) { 4599 val.release(); 4600 val = Val; 4601 } 4602 4603 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 4604 SourceLocation ExpLoc; 4605 if (!Val->isValueDependent() && 4606 VerifyIntegerConstantExpression(Val, &EnumVal)) { 4607 Val = 0; 4608 } else { 4609 EltTy = Val->getType(); 4610 } 4611 } 4612 4613 if (!Val) { 4614 if (LastEnumConst) { 4615 // Assign the last value + 1. 4616 EnumVal = LastEnumConst->getInitVal(); 4617 ++EnumVal; 4618 4619 // Check for overflow on increment. 4620 if (EnumVal < LastEnumConst->getInitVal()) 4621 Diag(IdLoc, diag::warn_enum_value_overflow); 4622 4623 EltTy = LastEnumConst->getType(); 4624 } else { 4625 // First value, set to zero. 4626 EltTy = Context.IntTy; 4627 EnumVal.zextOrTrunc(static_cast<uint32_t>(Context.getTypeSize(EltTy))); 4628 } 4629 } 4630 4631 val.release(); 4632 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 4633 Val, EnumVal); 4634} 4635 4636 4637Sema::DeclPtrTy Sema::ActOnEnumConstant(Scope *S, DeclPtrTy theEnumDecl, 4638 DeclPtrTy lastEnumConst, 4639 SourceLocation IdLoc, 4640 IdentifierInfo *Id, 4641 SourceLocation EqualLoc, ExprTy *val) { 4642 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl.getAs<Decl>()); 4643 EnumConstantDecl *LastEnumConst = 4644 cast_or_null<EnumConstantDecl>(lastEnumConst.getAs<Decl>()); 4645 Expr *Val = static_cast<Expr*>(val); 4646 4647 // The scope passed in may not be a decl scope. Zip up the scope tree until 4648 // we find one that is. 4649 S = getNonFieldDeclScope(S); 4650 4651 // Verify that there isn't already something declared with this name in this 4652 // scope. 4653 NamedDecl *PrevDecl = LookupName(S, Id, LookupOrdinaryName); 4654 if (PrevDecl && PrevDecl->isTemplateParameter()) { 4655 // Maybe we will complain about the shadowed template parameter. 4656 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 4657 // Just pretend that we didn't see the previous declaration. 4658 PrevDecl = 0; 4659 } 4660 4661 if (PrevDecl) { 4662 // When in C++, we may get a TagDecl with the same name; in this case the 4663 // enum constant will 'hide' the tag. 4664 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 4665 "Received TagDecl when not in C++!"); 4666 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 4667 if (isa<EnumConstantDecl>(PrevDecl)) 4668 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 4669 else 4670 Diag(IdLoc, diag::err_redefinition) << Id; 4671 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4672 if (Val) Val->Destroy(Context); 4673 return DeclPtrTy(); 4674 } 4675 } 4676 4677 EnumConstantDecl *New = CheckEnumConstant(TheEnumDecl, LastEnumConst, 4678 IdLoc, Id, Owned(Val)); 4679 4680 // Register this decl in the current scope stack. 4681 if (New) 4682 PushOnScopeChains(New, S); 4683 4684 return DeclPtrTy::make(New); 4685} 4686 4687void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc, 4688 SourceLocation RBraceLoc, DeclPtrTy EnumDeclX, 4689 DeclPtrTy *Elements, unsigned NumElements) { 4690 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX.getAs<Decl>()); 4691 QualType EnumType = Context.getTypeDeclType(Enum); 4692 4693 // TODO: If the result value doesn't fit in an int, it must be a long or long 4694 // long value. ISO C does not support this, but GCC does as an extension, 4695 // emit a warning. 4696 unsigned IntWidth = Context.Target.getIntWidth(); 4697 4698 // Verify that all the values are okay, compute the size of the values, and 4699 // reverse the list. 4700 unsigned NumNegativeBits = 0; 4701 unsigned NumPositiveBits = 0; 4702 4703 // Keep track of whether all elements have type int. 4704 bool AllElementsInt = true; 4705 4706 for (unsigned i = 0; i != NumElements; ++i) { 4707 EnumConstantDecl *ECD = 4708 cast_or_null<EnumConstantDecl>(Elements[i].getAs<Decl>()); 4709 if (!ECD) continue; // Already issued a diagnostic. 4710 4711 // If the enum value doesn't fit in an int, emit an extension warning. 4712 const llvm::APSInt &InitVal = ECD->getInitVal(); 4713 assert(InitVal.getBitWidth() >= IntWidth && 4714 "Should have promoted value to int"); 4715 if (InitVal.getBitWidth() > IntWidth) { 4716 llvm::APSInt V(InitVal); 4717 V.trunc(IntWidth); 4718 V.extend(InitVal.getBitWidth()); 4719 if (V != InitVal) 4720 Diag(ECD->getLocation(), diag::ext_enum_value_not_int) 4721 << InitVal.toString(10); 4722 } 4723 4724 // Keep track of the size of positive and negative values. 4725 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 4726 NumPositiveBits = std::max(NumPositiveBits, 4727 (unsigned)InitVal.getActiveBits()); 4728 else 4729 NumNegativeBits = std::max(NumNegativeBits, 4730 (unsigned)InitVal.getMinSignedBits()); 4731 4732 // Keep track of whether every enum element has type int (very commmon). 4733 if (AllElementsInt) 4734 AllElementsInt = ECD->getType() == Context.IntTy; 4735 } 4736 4737 // Figure out the type that should be used for this enum. 4738 // FIXME: Support attribute(packed) on enums and -fshort-enums. 4739 QualType BestType; 4740 unsigned BestWidth; 4741 4742 if (NumNegativeBits) { 4743 // If there is a negative value, figure out the smallest integer type (of 4744 // int/long/longlong) that fits. 4745 if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 4746 BestType = Context.IntTy; 4747 BestWidth = IntWidth; 4748 } else { 4749 BestWidth = Context.Target.getLongWidth(); 4750 4751 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) 4752 BestType = Context.LongTy; 4753 else { 4754 BestWidth = Context.Target.getLongLongWidth(); 4755 4756 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 4757 Diag(Enum->getLocation(), diag::warn_enum_too_large); 4758 BestType = Context.LongLongTy; 4759 } 4760 } 4761 } else { 4762 // If there is no negative value, figure out which of uint, ulong, ulonglong 4763 // fits. 4764 if (NumPositiveBits <= IntWidth) { 4765 BestType = Context.UnsignedIntTy; 4766 BestWidth = IntWidth; 4767 } else if (NumPositiveBits <= 4768 (BestWidth = Context.Target.getLongWidth())) { 4769 BestType = Context.UnsignedLongTy; 4770 } else { 4771 BestWidth = Context.Target.getLongLongWidth(); 4772 assert(NumPositiveBits <= BestWidth && 4773 "How could an initializer get larger than ULL?"); 4774 BestType = Context.UnsignedLongLongTy; 4775 } 4776 } 4777 4778 // Loop over all of the enumerator constants, changing their types to match 4779 // the type of the enum if needed. 4780 for (unsigned i = 0; i != NumElements; ++i) { 4781 EnumConstantDecl *ECD = 4782 cast_or_null<EnumConstantDecl>(Elements[i].getAs<Decl>()); 4783 if (!ECD) continue; // Already issued a diagnostic. 4784 4785 // Standard C says the enumerators have int type, but we allow, as an 4786 // extension, the enumerators to be larger than int size. If each 4787 // enumerator value fits in an int, type it as an int, otherwise type it the 4788 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 4789 // that X has type 'int', not 'unsigned'. 4790 if (ECD->getType() == Context.IntTy) { 4791 // Make sure the init value is signed. 4792 llvm::APSInt IV = ECD->getInitVal(); 4793 IV.setIsSigned(true); 4794 ECD->setInitVal(IV); 4795 4796 if (getLangOptions().CPlusPlus) 4797 // C++ [dcl.enum]p4: Following the closing brace of an 4798 // enum-specifier, each enumerator has the type of its 4799 // enumeration. 4800 ECD->setType(EnumType); 4801 continue; // Already int type. 4802 } 4803 4804 // Determine whether the value fits into an int. 4805 llvm::APSInt InitVal = ECD->getInitVal(); 4806 bool FitsInInt; 4807 if (InitVal.isUnsigned() || !InitVal.isNegative()) 4808 FitsInInt = InitVal.getActiveBits() < IntWidth; 4809 else 4810 FitsInInt = InitVal.getMinSignedBits() <= IntWidth; 4811 4812 // If it fits into an integer type, force it. Otherwise force it to match 4813 // the enum decl type. 4814 QualType NewTy; 4815 unsigned NewWidth; 4816 bool NewSign; 4817 if (FitsInInt) { 4818 NewTy = Context.IntTy; 4819 NewWidth = IntWidth; 4820 NewSign = true; 4821 } else if (ECD->getType() == BestType) { 4822 // Already the right type! 4823 if (getLangOptions().CPlusPlus) 4824 // C++ [dcl.enum]p4: Following the closing brace of an 4825 // enum-specifier, each enumerator has the type of its 4826 // enumeration. 4827 ECD->setType(EnumType); 4828 continue; 4829 } else { 4830 NewTy = BestType; 4831 NewWidth = BestWidth; 4832 NewSign = BestType->isSignedIntegerType(); 4833 } 4834 4835 // Adjust the APSInt value. 4836 InitVal.extOrTrunc(NewWidth); 4837 InitVal.setIsSigned(NewSign); 4838 ECD->setInitVal(InitVal); 4839 4840 // Adjust the Expr initializer and type. 4841 if (ECD->getInitExpr()) 4842 ECD->setInitExpr(new (Context) ImplicitCastExpr(NewTy, ECD->getInitExpr(), 4843 /*isLvalue=*/false)); 4844 if (getLangOptions().CPlusPlus) 4845 // C++ [dcl.enum]p4: Following the closing brace of an 4846 // enum-specifier, each enumerator has the type of its 4847 // enumeration. 4848 ECD->setType(EnumType); 4849 else 4850 ECD->setType(NewTy); 4851 } 4852 4853 Enum->completeDefinition(Context, BestType); 4854} 4855 4856Sema::DeclPtrTy Sema::ActOnFileScopeAsmDecl(SourceLocation Loc, 4857 ExprArg expr) { 4858 StringLiteral *AsmString = cast<StringLiteral>(expr.takeAs<Expr>()); 4859 4860 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext, 4861 Loc, AsmString); 4862 CurContext->addDecl(New); 4863 return DeclPtrTy::make(New); 4864} 4865 4866void Sema::ActOnPragmaWeakID(IdentifierInfo* Name, 4867 SourceLocation PragmaLoc, 4868 SourceLocation NameLoc) { 4869 Decl *PrevDecl = LookupName(TUScope, Name, LookupOrdinaryName); 4870 4871 // FIXME: This implementation is an ugly hack! 4872 if (PrevDecl) { 4873 PrevDecl->addAttr(::new (Context) WeakAttr()); 4874 return; 4875 } 4876 Diag(PragmaLoc, diag::err_unsupported_pragma_weak); 4877 return; 4878} 4879 4880void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name, 4881 IdentifierInfo* AliasName, 4882 SourceLocation PragmaLoc, 4883 SourceLocation NameLoc, 4884 SourceLocation AliasNameLoc) { 4885 Decl *PrevDecl = LookupName(TUScope, Name, LookupOrdinaryName); 4886 4887 // FIXME: This implementation is an ugly hack! 4888 if (PrevDecl) { 4889 PrevDecl->addAttr(::new (Context) AliasAttr(AliasName->getName())); 4890 PrevDecl->addAttr(::new (Context) WeakAttr()); 4891 return; 4892 } 4893 Diag(PragmaLoc, diag::err_unsupported_pragma_weak); 4894 return; 4895} 4896