SemaDecl.cpp revision eb92564b8e5ab9eaadb835b0bf6aee735aa4f370
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 OldMethod->getLexicalDeclContext() == 711 NewMethod->getLexicalDeclContext()) { 712 // -- Member function declarations with the same name and the 713 // same parameter types cannot be overloaded if any of them 714 // is a static member function declaration. 715 if (OldMethod->isStatic() || NewMethod->isStatic()) { 716 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 717 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 718 return true; 719 } 720 721 // C++ [class.mem]p1: 722 // [...] A member shall not be declared twice in the 723 // member-specification, except that a nested class or member 724 // class template can be declared and then later defined. 725 unsigned NewDiag; 726 if (isa<CXXConstructorDecl>(OldMethod)) 727 NewDiag = diag::err_constructor_redeclared; 728 else if (isa<CXXDestructorDecl>(NewMethod)) 729 NewDiag = diag::err_destructor_redeclared; 730 else if (isa<CXXConversionDecl>(NewMethod)) 731 NewDiag = diag::err_conv_function_redeclared; 732 else 733 NewDiag = diag::err_member_redeclared; 734 735 Diag(New->getLocation(), NewDiag); 736 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 737 } 738 739 // (C++98 8.3.5p3): 740 // All declarations for a function shall agree exactly in both the 741 // return type and the parameter-type-list. 742 if (OldQType == NewQType) 743 return MergeCompatibleFunctionDecls(New, Old); 744 745 // Fall through for conflicting redeclarations and redefinitions. 746 } 747 748 // C: Function types need to be compatible, not identical. This handles 749 // duplicate function decls like "void f(int); void f(enum X);" properly. 750 if (!getLangOptions().CPlusPlus && 751 Context.typesAreCompatible(OldQType, NewQType)) { 752 const FunctionType *OldFuncType = OldQType->getAsFunctionType(); 753 const FunctionType *NewFuncType = NewQType->getAsFunctionType(); 754 const FunctionProtoType *OldProto = 0; 755 if (isa<FunctionNoProtoType>(NewFuncType) && 756 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) { 757 // The old declaration provided a function prototype, but the 758 // new declaration does not. Merge in the prototype. 759 assert(!OldProto->hasExceptionSpec() && "Exception spec in C"); 760 llvm::SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(), 761 OldProto->arg_type_end()); 762 NewQType = Context.getFunctionType(NewFuncType->getResultType(), 763 ParamTypes.data(), ParamTypes.size(), 764 OldProto->isVariadic(), 765 OldProto->getTypeQuals()); 766 New->setType(NewQType); 767 New->setHasInheritedPrototype(); 768 769 // Synthesize a parameter for each argument type. 770 llvm::SmallVector<ParmVarDecl*, 16> Params; 771 for (FunctionProtoType::arg_type_iterator 772 ParamType = OldProto->arg_type_begin(), 773 ParamEnd = OldProto->arg_type_end(); 774 ParamType != ParamEnd; ++ParamType) { 775 ParmVarDecl *Param = ParmVarDecl::Create(Context, New, 776 SourceLocation(), 0, 777 *ParamType, VarDecl::None, 778 0); 779 Param->setImplicit(); 780 Params.push_back(Param); 781 } 782 783 New->setParams(Context, Params.data(), Params.size()); 784 } 785 786 return MergeCompatibleFunctionDecls(New, Old); 787 } 788 789 // GNU C permits a K&R definition to follow a prototype declaration 790 // if the declared types of the parameters in the K&R definition 791 // match the types in the prototype declaration, even when the 792 // promoted types of the parameters from the K&R definition differ 793 // from the types in the prototype. GCC then keeps the types from 794 // the prototype. 795 // 796 // If a variadic prototype is followed by a non-variadic K&R definition, 797 // the K&R definition becomes variadic. This is sort of an edge case, but 798 // it's legal per the standard depending on how you read C99 6.7.5.3p15 and 799 // C99 6.9.1p8. 800 if (!getLangOptions().CPlusPlus && 801 Old->hasPrototype() && !New->hasPrototype() && 802 New->getType()->getAsFunctionProtoType() && 803 Old->getNumParams() == New->getNumParams()) { 804 llvm::SmallVector<QualType, 16> ArgTypes; 805 llvm::SmallVector<GNUCompatibleParamWarning, 16> Warnings; 806 const FunctionProtoType *OldProto 807 = Old->getType()->getAsFunctionProtoType(); 808 const FunctionProtoType *NewProto 809 = New->getType()->getAsFunctionProtoType(); 810 811 // Determine whether this is the GNU C extension. 812 QualType MergedReturn = Context.mergeTypes(OldProto->getResultType(), 813 NewProto->getResultType()); 814 bool LooseCompatible = !MergedReturn.isNull(); 815 for (unsigned Idx = 0, End = Old->getNumParams(); 816 LooseCompatible && Idx != End; ++Idx) { 817 ParmVarDecl *OldParm = Old->getParamDecl(Idx); 818 ParmVarDecl *NewParm = New->getParamDecl(Idx); 819 if (Context.typesAreCompatible(OldParm->getType(), 820 NewProto->getArgType(Idx))) { 821 ArgTypes.push_back(NewParm->getType()); 822 } else if (Context.typesAreCompatible(OldParm->getType(), 823 NewParm->getType())) { 824 GNUCompatibleParamWarning Warn 825 = { OldParm, NewParm, NewProto->getArgType(Idx) }; 826 Warnings.push_back(Warn); 827 ArgTypes.push_back(NewParm->getType()); 828 } else 829 LooseCompatible = false; 830 } 831 832 if (LooseCompatible) { 833 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) { 834 Diag(Warnings[Warn].NewParm->getLocation(), 835 diag::ext_param_promoted_not_compatible_with_prototype) 836 << Warnings[Warn].PromotedType 837 << Warnings[Warn].OldParm->getType(); 838 Diag(Warnings[Warn].OldParm->getLocation(), 839 diag::note_previous_declaration); 840 } 841 842 New->setType(Context.getFunctionType(MergedReturn, &ArgTypes[0], 843 ArgTypes.size(), 844 OldProto->isVariadic(), 0)); 845 return MergeCompatibleFunctionDecls(New, Old); 846 } 847 848 // Fall through to diagnose conflicting types. 849 } 850 851 // A function that has already been declared has been redeclared or defined 852 // with a different type- show appropriate diagnostic 853 if (unsigned BuiltinID = Old->getBuiltinID(Context)) { 854 // The user has declared a builtin function with an incompatible 855 // signature. 856 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 857 // The function the user is redeclaring is a library-defined 858 // function like 'malloc' or 'printf'. Warn about the 859 // redeclaration, then pretend that we don't know about this 860 // library built-in. 861 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; 862 Diag(Old->getLocation(), diag::note_previous_builtin_declaration) 863 << Old << Old->getType(); 864 New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin); 865 Old->setInvalidDecl(); 866 return false; 867 } 868 869 PrevDiag = diag::note_previous_builtin_declaration; 870 } 871 872 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 873 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 874 return true; 875} 876 877/// \brief Completes the merge of two function declarations that are 878/// known to be compatible. 879/// 880/// This routine handles the merging of attributes and other 881/// properties of function declarations form the old declaration to 882/// the new declaration, once we know that New is in fact a 883/// redeclaration of Old. 884/// 885/// \returns false 886bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old) { 887 // Merge the attributes 888 MergeAttributes(New, Old, Context); 889 890 // Merge the storage class. 891 if (Old->getStorageClass() != FunctionDecl::Extern) 892 New->setStorageClass(Old->getStorageClass()); 893 894 // Merge "inline" 895 if (Old->isInline()) 896 New->setInline(true); 897 898 // If this function declaration by itself qualifies as a C99 inline 899 // definition (C99 6.7.4p6), but the previous definition did not, 900 // then the function is not a C99 inline definition. 901 if (New->isC99InlineDefinition() && !Old->isC99InlineDefinition()) 902 New->setC99InlineDefinition(false); 903 else if (Old->isC99InlineDefinition() && !New->isC99InlineDefinition()) { 904 // Mark all preceding definitions as not being C99 inline definitions. 905 for (const FunctionDecl *Prev = Old; Prev; 906 Prev = Prev->getPreviousDeclaration()) 907 const_cast<FunctionDecl *>(Prev)->setC99InlineDefinition(false); 908 } 909 910 // Merge "pure" flag. 911 if (Old->isPure()) 912 New->setPure(); 913 914 // Merge the "deleted" flag. 915 if (Old->isDeleted()) 916 New->setDeleted(); 917 918 if (getLangOptions().CPlusPlus) 919 return MergeCXXFunctionDecl(New, Old); 920 921 return false; 922} 923 924/// MergeVarDecl - We just parsed a variable 'New' which has the same name 925/// and scope as a previous declaration 'Old'. Figure out how to resolve this 926/// situation, merging decls or emitting diagnostics as appropriate. 927/// 928/// Tentative definition rules (C99 6.9.2p2) are checked by 929/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 930/// definitions here, since the initializer hasn't been attached. 931/// 932void Sema::MergeVarDecl(VarDecl *New, Decl *OldD) { 933 // If either decl is invalid, make sure the new one is marked invalid and 934 // don't do any other checking. 935 if (New->isInvalidDecl() || OldD->isInvalidDecl()) 936 return New->setInvalidDecl(); 937 938 // Verify the old decl was also a variable. 939 VarDecl *Old = dyn_cast<VarDecl>(OldD); 940 if (!Old) { 941 Diag(New->getLocation(), diag::err_redefinition_different_kind) 942 << New->getDeclName(); 943 Diag(OldD->getLocation(), diag::note_previous_definition); 944 return New->setInvalidDecl(); 945 } 946 947 MergeAttributes(New, Old, Context); 948 949 // Merge the types 950 QualType MergedT; 951 if (getLangOptions().CPlusPlus) { 952 if (Context.hasSameType(New->getType(), Old->getType())) 953 MergedT = New->getType(); 954 } else { 955 MergedT = Context.mergeTypes(New->getType(), Old->getType()); 956 } 957 if (MergedT.isNull()) { 958 Diag(New->getLocation(), diag::err_redefinition_different_type) 959 << New->getDeclName(); 960 Diag(Old->getLocation(), diag::note_previous_definition); 961 return New->setInvalidDecl(); 962 } 963 New->setType(MergedT); 964 965 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 966 if (New->getStorageClass() == VarDecl::Static && 967 (Old->getStorageClass() == VarDecl::None || Old->hasExternalStorage())) { 968 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 969 Diag(Old->getLocation(), diag::note_previous_definition); 970 return New->setInvalidDecl(); 971 } 972 // C99 6.2.2p4: 973 // For an identifier declared with the storage-class specifier 974 // extern in a scope in which a prior declaration of that 975 // identifier is visible,23) if the prior declaration specifies 976 // internal or external linkage, the linkage of the identifier at 977 // the later declaration is the same as the linkage specified at 978 // the prior declaration. If no prior declaration is visible, or 979 // if the prior declaration specifies no linkage, then the 980 // identifier has external linkage. 981 if (New->hasExternalStorage() && Old->hasLinkage()) 982 /* Okay */; 983 else if (New->getStorageClass() != VarDecl::Static && 984 Old->getStorageClass() == VarDecl::Static) { 985 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 986 Diag(Old->getLocation(), diag::note_previous_definition); 987 return New->setInvalidDecl(); 988 } 989 990 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 991 992 // FIXME: The test for external storage here seems wrong? We still 993 // need to check for mismatches. 994 if (!New->hasExternalStorage() && !New->isFileVarDecl() && 995 // Don't complain about out-of-line definitions of static members. 996 !(Old->getLexicalDeclContext()->isRecord() && 997 !New->getLexicalDeclContext()->isRecord())) { 998 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 999 Diag(Old->getLocation(), diag::note_previous_definition); 1000 return New->setInvalidDecl(); 1001 } 1002 1003 if (New->isThreadSpecified() && !Old->isThreadSpecified()) { 1004 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName(); 1005 Diag(Old->getLocation(), diag::note_previous_definition); 1006 } else if (!New->isThreadSpecified() && Old->isThreadSpecified()) { 1007 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName(); 1008 Diag(Old->getLocation(), diag::note_previous_definition); 1009 } 1010 1011 // Keep a chain of previous declarations. 1012 New->setPreviousDeclaration(Old); 1013} 1014 1015/// CheckParmsForFunctionDef - Check that the parameters of the given 1016/// function are appropriate for the definition of a function. This 1017/// takes care of any checks that cannot be performed on the 1018/// declaration itself, e.g., that the types of each of the function 1019/// parameters are complete. 1020bool Sema::CheckParmsForFunctionDef(FunctionDecl *FD) { 1021 bool HasInvalidParm = false; 1022 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 1023 ParmVarDecl *Param = FD->getParamDecl(p); 1024 1025 // C99 6.7.5.3p4: the parameters in a parameter type list in a 1026 // function declarator that is part of a function definition of 1027 // that function shall not have incomplete type. 1028 // 1029 // This is also C++ [dcl.fct]p6. 1030 if (!Param->isInvalidDecl() && 1031 RequireCompleteType(Param->getLocation(), Param->getType(), 1032 diag::err_typecheck_decl_incomplete_type)) { 1033 Param->setInvalidDecl(); 1034 HasInvalidParm = true; 1035 } 1036 1037 // C99 6.9.1p5: If the declarator includes a parameter type list, the 1038 // declaration of each parameter shall include an identifier. 1039 if (Param->getIdentifier() == 0 && 1040 !Param->isImplicit() && 1041 !getLangOptions().CPlusPlus) 1042 Diag(Param->getLocation(), diag::err_parameter_name_omitted); 1043 } 1044 1045 return HasInvalidParm; 1046} 1047 1048/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 1049/// no declarator (e.g. "struct foo;") is parsed. 1050Sema::DeclPtrTy Sema::ParsedFreeStandingDeclSpec(Scope *S, DeclSpec &DS) { 1051 // FIXME: Error on auto/register at file scope 1052 // FIXME: Error on inline/virtual/explicit 1053 // FIXME: Error on invalid restrict 1054 // FIXME: Warn on useless __thread 1055 // FIXME: Warn on useless const/volatile 1056 // FIXME: Warn on useless static/extern/typedef/private_extern/mutable 1057 // FIXME: Warn on useless attributes 1058 TagDecl *Tag = 0; 1059 if (DS.getTypeSpecType() == DeclSpec::TST_class || 1060 DS.getTypeSpecType() == DeclSpec::TST_struct || 1061 DS.getTypeSpecType() == DeclSpec::TST_union || 1062 DS.getTypeSpecType() == DeclSpec::TST_enum) { 1063 if (!DS.getTypeRep()) // We probably had an error 1064 return DeclPtrTy(); 1065 1066 Tag = dyn_cast<TagDecl>(static_cast<Decl *>(DS.getTypeRep())); 1067 } 1068 1069 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 1070 if (!Record->getDeclName() && Record->isDefinition() && 1071 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { 1072 if (getLangOptions().CPlusPlus || 1073 Record->getDeclContext()->isRecord()) 1074 return BuildAnonymousStructOrUnion(S, DS, Record); 1075 1076 Diag(DS.getSourceRange().getBegin(), diag::err_no_declarators) 1077 << DS.getSourceRange(); 1078 } 1079 1080 // Microsoft allows unnamed struct/union fields. Don't complain 1081 // about them. 1082 // FIXME: Should we support Microsoft's extensions in this area? 1083 if (Record->getDeclName() && getLangOptions().Microsoft) 1084 return DeclPtrTy::make(Tag); 1085 } 1086 1087 if (!DS.isMissingDeclaratorOk() && 1088 DS.getTypeSpecType() != DeclSpec::TST_error) { 1089 // Warn about typedefs of enums without names, since this is an 1090 // extension in both Microsoft an GNU. 1091 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 1092 Tag && isa<EnumDecl>(Tag)) { 1093 Diag(DS.getSourceRange().getBegin(), diag::ext_typedef_without_a_name) 1094 << DS.getSourceRange(); 1095 return DeclPtrTy::make(Tag); 1096 } 1097 1098 Diag(DS.getSourceRange().getBegin(), diag::err_no_declarators) 1099 << DS.getSourceRange(); 1100 return DeclPtrTy(); 1101 } 1102 1103 return DeclPtrTy::make(Tag); 1104} 1105 1106/// InjectAnonymousStructOrUnionMembers - Inject the members of the 1107/// anonymous struct or union AnonRecord into the owning context Owner 1108/// and scope S. This routine will be invoked just after we realize 1109/// that an unnamed union or struct is actually an anonymous union or 1110/// struct, e.g., 1111/// 1112/// @code 1113/// union { 1114/// int i; 1115/// float f; 1116/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 1117/// // f into the surrounding scope.x 1118/// @endcode 1119/// 1120/// This routine is recursive, injecting the names of nested anonymous 1121/// structs/unions into the owning context and scope as well. 1122bool Sema::InjectAnonymousStructOrUnionMembers(Scope *S, DeclContext *Owner, 1123 RecordDecl *AnonRecord) { 1124 bool Invalid = false; 1125 for (RecordDecl::field_iterator F = AnonRecord->field_begin(), 1126 FEnd = AnonRecord->field_end(); 1127 F != FEnd; ++F) { 1128 if ((*F)->getDeclName()) { 1129 NamedDecl *PrevDecl = LookupQualifiedName(Owner, (*F)->getDeclName(), 1130 LookupOrdinaryName, true); 1131 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 1132 // C++ [class.union]p2: 1133 // The names of the members of an anonymous union shall be 1134 // distinct from the names of any other entity in the 1135 // scope in which the anonymous union is declared. 1136 unsigned diagKind 1137 = AnonRecord->isUnion()? diag::err_anonymous_union_member_redecl 1138 : diag::err_anonymous_struct_member_redecl; 1139 Diag((*F)->getLocation(), diagKind) 1140 << (*F)->getDeclName(); 1141 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 1142 Invalid = true; 1143 } else { 1144 // C++ [class.union]p2: 1145 // For the purpose of name lookup, after the anonymous union 1146 // definition, the members of the anonymous union are 1147 // considered to have been defined in the scope in which the 1148 // anonymous union is declared. 1149 Owner->makeDeclVisibleInContext(*F); 1150 S->AddDecl(DeclPtrTy::make(*F)); 1151 IdResolver.AddDecl(*F); 1152 } 1153 } else if (const RecordType *InnerRecordType 1154 = (*F)->getType()->getAsRecordType()) { 1155 RecordDecl *InnerRecord = InnerRecordType->getDecl(); 1156 if (InnerRecord->isAnonymousStructOrUnion()) 1157 Invalid = Invalid || 1158 InjectAnonymousStructOrUnionMembers(S, Owner, InnerRecord); 1159 } 1160 } 1161 1162 return Invalid; 1163} 1164 1165/// ActOnAnonymousStructOrUnion - Handle the declaration of an 1166/// anonymous structure or union. Anonymous unions are a C++ feature 1167/// (C++ [class.union]) and a GNU C extension; anonymous structures 1168/// are a GNU C and GNU C++ extension. 1169Sema::DeclPtrTy Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 1170 RecordDecl *Record) { 1171 DeclContext *Owner = Record->getDeclContext(); 1172 1173 // Diagnose whether this anonymous struct/union is an extension. 1174 if (Record->isUnion() && !getLangOptions().CPlusPlus) 1175 Diag(Record->getLocation(), diag::ext_anonymous_union); 1176 else if (!Record->isUnion()) 1177 Diag(Record->getLocation(), diag::ext_anonymous_struct); 1178 1179 // C and C++ require different kinds of checks for anonymous 1180 // structs/unions. 1181 bool Invalid = false; 1182 if (getLangOptions().CPlusPlus) { 1183 const char* PrevSpec = 0; 1184 // C++ [class.union]p3: 1185 // Anonymous unions declared in a named namespace or in the 1186 // global namespace shall be declared static. 1187 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 1188 (isa<TranslationUnitDecl>(Owner) || 1189 (isa<NamespaceDecl>(Owner) && 1190 cast<NamespaceDecl>(Owner)->getDeclName()))) { 1191 Diag(Record->getLocation(), diag::err_anonymous_union_not_static); 1192 Invalid = true; 1193 1194 // Recover by adding 'static'. 1195 DS.SetStorageClassSpec(DeclSpec::SCS_static, SourceLocation(), PrevSpec); 1196 } 1197 // C++ [class.union]p3: 1198 // A storage class is not allowed in a declaration of an 1199 // anonymous union in a class scope. 1200 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 1201 isa<RecordDecl>(Owner)) { 1202 Diag(DS.getStorageClassSpecLoc(), 1203 diag::err_anonymous_union_with_storage_spec); 1204 Invalid = true; 1205 1206 // Recover by removing the storage specifier. 1207 DS.SetStorageClassSpec(DeclSpec::SCS_unspecified, SourceLocation(), 1208 PrevSpec); 1209 } 1210 1211 // C++ [class.union]p2: 1212 // The member-specification of an anonymous union shall only 1213 // define non-static data members. [Note: nested types and 1214 // functions cannot be declared within an anonymous union. ] 1215 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 1216 MemEnd = Record->decls_end(); 1217 Mem != MemEnd; ++Mem) { 1218 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 1219 // C++ [class.union]p3: 1220 // An anonymous union shall not have private or protected 1221 // members (clause 11). 1222 if (FD->getAccess() == AS_protected || FD->getAccess() == AS_private) { 1223 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 1224 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 1225 Invalid = true; 1226 } 1227 } else if ((*Mem)->isImplicit()) { 1228 // Any implicit members are fine. 1229 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 1230 // This is a type that showed up in an 1231 // elaborated-type-specifier inside the anonymous struct or 1232 // union, but which actually declares a type outside of the 1233 // anonymous struct or union. It's okay. 1234 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 1235 if (!MemRecord->isAnonymousStructOrUnion() && 1236 MemRecord->getDeclName()) { 1237 // This is a nested type declaration. 1238 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 1239 << (int)Record->isUnion(); 1240 Invalid = true; 1241 } 1242 } else { 1243 // We have something that isn't a non-static data 1244 // member. Complain about it. 1245 unsigned DK = diag::err_anonymous_record_bad_member; 1246 if (isa<TypeDecl>(*Mem)) 1247 DK = diag::err_anonymous_record_with_type; 1248 else if (isa<FunctionDecl>(*Mem)) 1249 DK = diag::err_anonymous_record_with_function; 1250 else if (isa<VarDecl>(*Mem)) 1251 DK = diag::err_anonymous_record_with_static; 1252 Diag((*Mem)->getLocation(), DK) 1253 << (int)Record->isUnion(); 1254 Invalid = true; 1255 } 1256 } 1257 } 1258 1259 if (!Record->isUnion() && !Owner->isRecord()) { 1260 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 1261 << (int)getLangOptions().CPlusPlus; 1262 Invalid = true; 1263 } 1264 1265 // Create a declaration for this anonymous struct/union. 1266 NamedDecl *Anon = 0; 1267 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 1268 Anon = FieldDecl::Create(Context, OwningClass, Record->getLocation(), 1269 /*IdentifierInfo=*/0, 1270 Context.getTypeDeclType(Record), 1271 /*BitWidth=*/0, /*Mutable=*/false); 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()); 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, Redeclaration); 1524 } 1525 1526 if (New == 0) 1527 return DeclPtrTy(); 1528 1529 // If this has an identifier and is not an invalid redeclaration, 1530 // add it to the scope stack. 1531 if (Name && !(Redeclaration && New->isInvalidDecl())) 1532 PushOnScopeChains(New, S); 1533 1534 return DeclPtrTy::make(New); 1535} 1536 1537/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 1538/// types into constant array types in certain situations which would otherwise 1539/// be errors (for GCC compatibility). 1540static QualType TryToFixInvalidVariablyModifiedType(QualType T, 1541 ASTContext &Context, 1542 bool &SizeIsNegative) { 1543 // This method tries to turn a variable array into a constant 1544 // array even when the size isn't an ICE. This is necessary 1545 // for compatibility with code that depends on gcc's buggy 1546 // constant expression folding, like struct {char x[(int)(char*)2];} 1547 SizeIsNegative = false; 1548 1549 if (const PointerType* PTy = dyn_cast<PointerType>(T)) { 1550 QualType Pointee = PTy->getPointeeType(); 1551 QualType FixedType = 1552 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative); 1553 if (FixedType.isNull()) return FixedType; 1554 FixedType = Context.getPointerType(FixedType); 1555 FixedType.setCVRQualifiers(T.getCVRQualifiers()); 1556 return FixedType; 1557 } 1558 1559 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 1560 if (!VLATy) 1561 return QualType(); 1562 // FIXME: We should probably handle this case 1563 if (VLATy->getElementType()->isVariablyModifiedType()) 1564 return QualType(); 1565 1566 Expr::EvalResult EvalResult; 1567 if (!VLATy->getSizeExpr() || 1568 !VLATy->getSizeExpr()->Evaluate(EvalResult, Context) || 1569 !EvalResult.Val.isInt()) 1570 return QualType(); 1571 1572 llvm::APSInt &Res = EvalResult.Val.getInt(); 1573 if (Res >= llvm::APSInt(Res.getBitWidth(), Res.isUnsigned())) { 1574 Expr* ArySizeExpr = VLATy->getSizeExpr(); 1575 // FIXME: here we could "steal" (how?) ArySizeExpr from the VLA, 1576 // so as to transfer ownership to the ConstantArrayWithExpr. 1577 // Alternatively, we could "clone" it (how?). 1578 // Since we don't know how to do things above, we just use the 1579 // very same Expr*. 1580 return Context.getConstantArrayWithExprType(VLATy->getElementType(), 1581 Res, ArySizeExpr, 1582 ArrayType::Normal, 0, 1583 VLATy->getBracketsRange()); 1584 } 1585 1586 SizeIsNegative = true; 1587 return QualType(); 1588} 1589 1590/// \brief Register the given locally-scoped external C declaration so 1591/// that it can be found later for redeclarations 1592void 1593Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, NamedDecl *PrevDecl, 1594 Scope *S) { 1595 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 1596 "Decl is not a locally-scoped decl!"); 1597 // Note that we have a locally-scoped external with this name. 1598 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 1599 1600 if (!PrevDecl) 1601 return; 1602 1603 // If there was a previous declaration of this variable, it may be 1604 // in our identifier chain. Update the identifier chain with the new 1605 // declaration. 1606 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 1607 // The previous declaration was found on the identifer resolver 1608 // chain, so remove it from its scope. 1609 while (S && !S->isDeclScope(DeclPtrTy::make(PrevDecl))) 1610 S = S->getParent(); 1611 1612 if (S) 1613 S->RemoveDecl(DeclPtrTy::make(PrevDecl)); 1614 } 1615} 1616 1617/// \brief Diagnose function specifiers on a declaration of an identifier that 1618/// does not identify a function. 1619void Sema::DiagnoseFunctionSpecifiers(Declarator& D) { 1620 // FIXME: We should probably indicate the identifier in question to avoid 1621 // confusion for constructs like "inline int a(), b;" 1622 if (D.getDeclSpec().isInlineSpecified()) 1623 Diag(D.getDeclSpec().getInlineSpecLoc(), 1624 diag::err_inline_non_function); 1625 1626 if (D.getDeclSpec().isVirtualSpecified()) 1627 Diag(D.getDeclSpec().getVirtualSpecLoc(), 1628 diag::err_virtual_non_function); 1629 1630 if (D.getDeclSpec().isExplicitSpecified()) 1631 Diag(D.getDeclSpec().getExplicitSpecLoc(), 1632 diag::err_explicit_non_function); 1633} 1634 1635NamedDecl* 1636Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 1637 QualType R, Decl* PrevDecl, bool &Redeclaration) { 1638 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 1639 if (D.getCXXScopeSpec().isSet()) { 1640 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 1641 << D.getCXXScopeSpec().getRange(); 1642 D.setInvalidType(); 1643 // Pretend we didn't see the scope specifier. 1644 DC = 0; 1645 } 1646 1647 if (getLangOptions().CPlusPlus) { 1648 // Check that there are no default arguments (C++ only). 1649 CheckExtraCXXDefaultArguments(D); 1650 } 1651 1652 DiagnoseFunctionSpecifiers(D); 1653 1654 if (D.getDeclSpec().isThreadSpecified()) 1655 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 1656 1657 TypedefDecl *NewTD = ParseTypedefDecl(S, D, R); 1658 if (!NewTD) return 0; 1659 1660 if (D.isInvalidType()) 1661 NewTD->setInvalidDecl(); 1662 1663 // Handle attributes prior to checking for duplicates in MergeVarDecl 1664 ProcessDeclAttributes(S, NewTD, D); 1665 // Merge the decl with the existing one if appropriate. If the decl is 1666 // in an outer scope, it isn't the same thing. 1667 if (PrevDecl && isDeclInScope(PrevDecl, DC, S)) { 1668 Redeclaration = true; 1669 MergeTypeDefDecl(NewTD, PrevDecl); 1670 } 1671 1672 // C99 6.7.7p2: If a typedef name specifies a variably modified type 1673 // then it shall have block scope. 1674 QualType T = NewTD->getUnderlyingType(); 1675 if (T->isVariablyModifiedType()) { 1676 CurFunctionNeedsScopeChecking = true; 1677 1678 if (S->getFnParent() == 0) { 1679 bool SizeIsNegative; 1680 QualType FixedTy = 1681 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative); 1682 if (!FixedTy.isNull()) { 1683 Diag(D.getIdentifierLoc(), diag::warn_illegal_constant_array_size); 1684 NewTD->setUnderlyingType(FixedTy); 1685 } else { 1686 if (SizeIsNegative) 1687 Diag(D.getIdentifierLoc(), diag::err_typecheck_negative_array_size); 1688 else if (T->isVariableArrayType()) 1689 Diag(D.getIdentifierLoc(), diag::err_vla_decl_in_file_scope); 1690 else 1691 Diag(D.getIdentifierLoc(), diag::err_vm_decl_in_file_scope); 1692 NewTD->setInvalidDecl(); 1693 } 1694 } 1695 } 1696 1697 // If this is the C FILE type, notify the AST context. 1698 if (IdentifierInfo *II = NewTD->getIdentifier()) 1699 if (!NewTD->isInvalidDecl() && 1700 NewTD->getDeclContext()->getLookupContext()->isTranslationUnit() && 1701 II->isStr("FILE")) 1702 Context.setFILEDecl(NewTD); 1703 1704 return NewTD; 1705} 1706 1707/// \brief Determines whether the given declaration is an out-of-scope 1708/// previous declaration. 1709/// 1710/// This routine should be invoked when name lookup has found a 1711/// previous declaration (PrevDecl) that is not in the scope where a 1712/// new declaration by the same name is being introduced. If the new 1713/// declaration occurs in a local scope, previous declarations with 1714/// linkage may still be considered previous declarations (C99 1715/// 6.2.2p4-5, C++ [basic.link]p6). 1716/// 1717/// \param PrevDecl the previous declaration found by name 1718/// lookup 1719/// 1720/// \param DC the context in which the new declaration is being 1721/// declared. 1722/// 1723/// \returns true if PrevDecl is an out-of-scope previous declaration 1724/// for a new delcaration with the same name. 1725static bool 1726isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 1727 ASTContext &Context) { 1728 if (!PrevDecl) 1729 return 0; 1730 1731 // FIXME: PrevDecl could be an OverloadedFunctionDecl, in which 1732 // case we need to check each of the overloaded functions. 1733 if (!PrevDecl->hasLinkage()) 1734 return false; 1735 1736 if (Context.getLangOptions().CPlusPlus) { 1737 // C++ [basic.link]p6: 1738 // If there is a visible declaration of an entity with linkage 1739 // having the same name and type, ignoring entities declared 1740 // outside the innermost enclosing namespace scope, the block 1741 // scope declaration declares that same entity and receives the 1742 // linkage of the previous declaration. 1743 DeclContext *OuterContext = DC->getLookupContext(); 1744 if (!OuterContext->isFunctionOrMethod()) 1745 // This rule only applies to block-scope declarations. 1746 return false; 1747 else { 1748 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 1749 if (PrevOuterContext->isRecord()) 1750 // We found a member function: ignore it. 1751 return false; 1752 else { 1753 // Find the innermost enclosing namespace for the new and 1754 // previous declarations. 1755 while (!OuterContext->isFileContext()) 1756 OuterContext = OuterContext->getParent(); 1757 while (!PrevOuterContext->isFileContext()) 1758 PrevOuterContext = PrevOuterContext->getParent(); 1759 1760 // The previous declaration is in a different namespace, so it 1761 // isn't the same function. 1762 if (OuterContext->getPrimaryContext() != 1763 PrevOuterContext->getPrimaryContext()) 1764 return false; 1765 } 1766 } 1767 } 1768 1769 return true; 1770} 1771 1772NamedDecl* 1773Sema::ActOnVariableDeclarator(Scope* S, Declarator& D, DeclContext* DC, 1774 QualType R,NamedDecl* PrevDecl, 1775 bool &Redeclaration) { 1776 DeclarationName Name = GetNameForDeclarator(D); 1777 1778 // Check that there are no default arguments (C++ only). 1779 if (getLangOptions().CPlusPlus) 1780 CheckExtraCXXDefaultArguments(D); 1781 1782 VarDecl *NewVD; 1783 VarDecl::StorageClass SC; 1784 switch (D.getDeclSpec().getStorageClassSpec()) { 1785 default: assert(0 && "Unknown storage class!"); 1786 case DeclSpec::SCS_unspecified: SC = VarDecl::None; break; 1787 case DeclSpec::SCS_extern: SC = VarDecl::Extern; break; 1788 case DeclSpec::SCS_static: SC = VarDecl::Static; break; 1789 case DeclSpec::SCS_auto: SC = VarDecl::Auto; break; 1790 case DeclSpec::SCS_register: SC = VarDecl::Register; break; 1791 case DeclSpec::SCS_private_extern: SC = VarDecl::PrivateExtern; break; 1792 case DeclSpec::SCS_mutable: 1793 // mutable can only appear on non-static class members, so it's always 1794 // an error here 1795 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 1796 D.setInvalidType(); 1797 SC = VarDecl::None; 1798 break; 1799 } 1800 1801 IdentifierInfo *II = Name.getAsIdentifierInfo(); 1802 if (!II) { 1803 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 1804 << Name.getAsString(); 1805 return 0; 1806 } 1807 1808 DiagnoseFunctionSpecifiers(D); 1809 1810 if (!DC->isRecord() && S->getFnParent() == 0) { 1811 // C99 6.9p2: The storage-class specifiers auto and register shall not 1812 // appear in the declaration specifiers in an external declaration. 1813 if (SC == VarDecl::Auto || SC == VarDecl::Register) { 1814 1815 // If this is a register variable with an asm label specified, then this 1816 // is a GNU extension. 1817 if (SC == VarDecl::Register && D.getAsmLabel()) 1818 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register); 1819 else 1820 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 1821 D.setInvalidType(); 1822 } 1823 } 1824 if (DC->isRecord() && !CurContext->isRecord()) { 1825 // This is an out-of-line definition of a static data member. 1826 if (SC == VarDecl::Static) { 1827 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 1828 diag::err_static_out_of_line) 1829 << CodeModificationHint::CreateRemoval( 1830 SourceRange(D.getDeclSpec().getStorageClassSpecLoc())); 1831 } else if (SC == VarDecl::None) 1832 SC = VarDecl::Static; 1833 } 1834 if (SC == VarDecl::Static) { 1835 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) { 1836 if (RD->isLocalClass()) 1837 Diag(D.getIdentifierLoc(), 1838 diag::err_static_data_member_not_allowed_in_local_class) 1839 << Name << RD->getDeclName(); 1840 } 1841 } 1842 1843 1844 // The variable can not 1845 NewVD = VarDecl::Create(Context, DC, D.getIdentifierLoc(), 1846 II, R, SC, 1847 // FIXME: Move to DeclGroup... 1848 D.getDeclSpec().getSourceRange().getBegin()); 1849 1850 if (D.isInvalidType()) 1851 NewVD->setInvalidDecl(); 1852 1853 if (D.getDeclSpec().isThreadSpecified()) { 1854 if (NewVD->hasLocalStorage()) 1855 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global); 1856 else if (!Context.Target.isTLSSupported()) 1857 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported); 1858 else 1859 NewVD->setThreadSpecified(true); 1860 } 1861 1862 // Set the lexical context. If the declarator has a C++ scope specifier, the 1863 // lexical context will be different from the semantic context. 1864 NewVD->setLexicalDeclContext(CurContext); 1865 1866 // Handle attributes prior to checking for duplicates in MergeVarDecl 1867 ProcessDeclAttributes(S, NewVD, D); 1868 1869 // Handle GNU asm-label extension (encoded as an attribute). 1870 if (Expr *E = (Expr*) D.getAsmLabel()) { 1871 // The parser guarantees this is a string. 1872 StringLiteral *SE = cast<StringLiteral>(E); 1873 NewVD->addAttr(::new (Context) AsmLabelAttr(std::string(SE->getStrData(), 1874 SE->getByteLength()))); 1875 } 1876 1877 // If name lookup finds a previous declaration that is not in the 1878 // same scope as the new declaration, this may still be an 1879 // acceptable redeclaration. 1880 if (PrevDecl && !isDeclInScope(PrevDecl, DC, S) && 1881 !(NewVD->hasLinkage() && 1882 isOutOfScopePreviousDeclaration(PrevDecl, DC, Context))) 1883 PrevDecl = 0; 1884 1885 // Merge the decl with the existing one if appropriate. 1886 if (PrevDecl) { 1887 if (isa<FieldDecl>(PrevDecl) && D.getCXXScopeSpec().isSet()) { 1888 // The user tried to define a non-static data member 1889 // out-of-line (C++ [dcl.meaning]p1). 1890 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 1891 << D.getCXXScopeSpec().getRange(); 1892 PrevDecl = 0; 1893 NewVD->setInvalidDecl(); 1894 } 1895 } else if (D.getCXXScopeSpec().isSet()) { 1896 // No previous declaration in the qualifying scope. 1897 Diag(D.getIdentifierLoc(), diag::err_typecheck_no_member) 1898 << Name << D.getCXXScopeSpec().getRange(); 1899 NewVD->setInvalidDecl(); 1900 } 1901 1902 CheckVariableDeclaration(NewVD, PrevDecl, Redeclaration); 1903 1904 // If this is a locally-scoped extern C variable, update the map of 1905 // such variables. 1906 if (CurContext->isFunctionOrMethod() && NewVD->isExternC(Context) && 1907 !NewVD->isInvalidDecl()) 1908 RegisterLocallyScopedExternCDecl(NewVD, PrevDecl, S); 1909 1910 return NewVD; 1911} 1912 1913/// \brief Perform semantic checking on a newly-created variable 1914/// declaration. 1915/// 1916/// This routine performs all of the type-checking required for a 1917/// variable declaration once it has been built. It is used both to 1918/// check variables after they have been parsed and their declarators 1919/// have been translated into a declaration, and to check variables 1920/// that have been instantiated from a template. 1921/// 1922/// Sets NewVD->isInvalidDecl() if an error was encountered. 1923void Sema::CheckVariableDeclaration(VarDecl *NewVD, NamedDecl *PrevDecl, 1924 bool &Redeclaration) { 1925 // If the decl is already known invalid, don't check it. 1926 if (NewVD->isInvalidDecl()) 1927 return; 1928 1929 QualType T = NewVD->getType(); 1930 1931 if (T->isObjCInterfaceType()) { 1932 Diag(NewVD->getLocation(), diag::err_statically_allocated_object); 1933 return NewVD->setInvalidDecl(); 1934 } 1935 1936 // The variable can not have an abstract class type. 1937 if (RequireNonAbstractType(NewVD->getLocation(), T, 1938 diag::err_abstract_type_in_decl, 1939 AbstractVariableType)) 1940 return NewVD->setInvalidDecl(); 1941 1942 // Emit an error if an address space was applied to decl with local storage. 1943 // This includes arrays of objects with address space qualifiers, but not 1944 // automatic variables that point to other address spaces. 1945 // ISO/IEC TR 18037 S5.1.2 1946 if (NewVD->hasLocalStorage() && (T.getAddressSpace() != 0)) { 1947 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 1948 return NewVD->setInvalidDecl(); 1949 } 1950 1951 if (NewVD->hasLocalStorage() && T.isObjCGCWeak() 1952 && !NewVD->hasAttr<BlocksAttr>()) 1953 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 1954 1955 bool isVM = T->isVariablyModifiedType(); 1956 if (isVM || NewVD->hasAttr<CleanupAttr>()) 1957 CurFunctionNeedsScopeChecking = true; 1958 1959 if ((isVM && NewVD->hasLinkage()) || 1960 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { 1961 bool SizeIsNegative; 1962 QualType FixedTy = 1963 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative); 1964 1965 if (FixedTy.isNull() && T->isVariableArrayType()) { 1966 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 1967 // FIXME: This won't give the correct result for 1968 // int a[10][n]; 1969 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 1970 1971 if (NewVD->isFileVarDecl()) 1972 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 1973 << SizeRange; 1974 else if (NewVD->getStorageClass() == VarDecl::Static) 1975 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 1976 << SizeRange; 1977 else 1978 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 1979 << SizeRange; 1980 return NewVD->setInvalidDecl(); 1981 } 1982 1983 if (FixedTy.isNull()) { 1984 if (NewVD->isFileVarDecl()) 1985 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 1986 else 1987 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 1988 return NewVD->setInvalidDecl(); 1989 } 1990 1991 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 1992 NewVD->setType(FixedTy); 1993 } 1994 1995 if (!PrevDecl && NewVD->isExternC(Context)) { 1996 // Since we did not find anything by this name and we're declaring 1997 // an extern "C" variable, look for a non-visible extern "C" 1998 // declaration with the same name. 1999 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 2000 = LocallyScopedExternalDecls.find(NewVD->getDeclName()); 2001 if (Pos != LocallyScopedExternalDecls.end()) 2002 PrevDecl = Pos->second; 2003 } 2004 2005 if (T->isVoidType() && !NewVD->hasExternalStorage()) { 2006 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 2007 << T; 2008 return NewVD->setInvalidDecl(); 2009 } 2010 2011 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { 2012 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); 2013 return NewVD->setInvalidDecl(); 2014 } 2015 2016 if (isVM && NewVD->hasAttr<BlocksAttr>()) { 2017 Diag(NewVD->getLocation(), diag::err_block_on_vm); 2018 return NewVD->setInvalidDecl(); 2019 } 2020 2021 if (PrevDecl) { 2022 Redeclaration = true; 2023 MergeVarDecl(NewVD, PrevDecl); 2024 } 2025} 2026 2027NamedDecl* 2028Sema::ActOnFunctionDeclarator(Scope* S, Declarator& D, DeclContext* DC, 2029 QualType R, NamedDecl* PrevDecl, 2030 MultiTemplateParamsArg TemplateParamLists, 2031 bool IsFunctionDefinition, bool &Redeclaration) { 2032 assert(R.getTypePtr()->isFunctionType()); 2033 2034 DeclarationName Name = GetNameForDeclarator(D); 2035 FunctionDecl::StorageClass SC = FunctionDecl::None; 2036 switch (D.getDeclSpec().getStorageClassSpec()) { 2037 default: assert(0 && "Unknown storage class!"); 2038 case DeclSpec::SCS_auto: 2039 case DeclSpec::SCS_register: 2040 case DeclSpec::SCS_mutable: 2041 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2042 diag::err_typecheck_sclass_func); 2043 D.setInvalidType(); 2044 break; 2045 case DeclSpec::SCS_unspecified: SC = FunctionDecl::None; break; 2046 case DeclSpec::SCS_extern: SC = FunctionDecl::Extern; break; 2047 case DeclSpec::SCS_static: { 2048 if (CurContext->getLookupContext()->isFunctionOrMethod()) { 2049 // C99 6.7.1p5: 2050 // The declaration of an identifier for a function that has 2051 // block scope shall have no explicit storage-class specifier 2052 // other than extern 2053 // See also (C++ [dcl.stc]p4). 2054 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2055 diag::err_static_block_func); 2056 SC = FunctionDecl::None; 2057 } else 2058 SC = FunctionDecl::Static; 2059 break; 2060 } 2061 case DeclSpec::SCS_private_extern: SC = FunctionDecl::PrivateExtern;break; 2062 } 2063 2064 if (D.getDeclSpec().isThreadSpecified()) 2065 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 2066 2067 bool isInline = D.getDeclSpec().isInlineSpecified(); 2068 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2069 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 2070 2071 // Check that the return type is not an abstract class type. 2072 // For record types, this is done by the AbstractClassUsageDiagnoser once 2073 // the class has been completely parsed. 2074 if (!DC->isRecord() && 2075 RequireNonAbstractType(D.getIdentifierLoc(), 2076 R->getAsFunctionType()->getResultType(), 2077 diag::err_abstract_type_in_decl, 2078 AbstractReturnType)) 2079 D.setInvalidType(); 2080 2081 // Do not allow returning a objc interface by-value. 2082 if (R->getAsFunctionType()->getResultType()->isObjCInterfaceType()) { 2083 Diag(D.getIdentifierLoc(), 2084 diag::err_object_cannot_be_passed_returned_by_value) << 0 2085 << R->getAsFunctionType()->getResultType(); 2086 D.setInvalidType(); 2087 } 2088 2089 // Check that we can declare a template here. 2090 if (TemplateParamLists.size() && 2091 CheckTemplateDeclScope(S, TemplateParamLists)) 2092 return 0; 2093 2094 bool isVirtualOkay = false; 2095 FunctionDecl *NewFD; 2096 if (D.getKind() == Declarator::DK_Constructor) { 2097 // This is a C++ constructor declaration. 2098 assert(DC->isRecord() && 2099 "Constructors can only be declared in a member context"); 2100 2101 R = CheckConstructorDeclarator(D, R, SC); 2102 2103 // Create the new declaration 2104 NewFD = CXXConstructorDecl::Create(Context, 2105 cast<CXXRecordDecl>(DC), 2106 D.getIdentifierLoc(), Name, R, 2107 isExplicit, isInline, 2108 /*isImplicitlyDeclared=*/false); 2109 } else if (D.getKind() == Declarator::DK_Destructor) { 2110 // This is a C++ destructor declaration. 2111 if (DC->isRecord()) { 2112 R = CheckDestructorDeclarator(D, SC); 2113 2114 NewFD = CXXDestructorDecl::Create(Context, 2115 cast<CXXRecordDecl>(DC), 2116 D.getIdentifierLoc(), Name, R, 2117 isInline, 2118 /*isImplicitlyDeclared=*/false); 2119 2120 isVirtualOkay = true; 2121 } else { 2122 Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 2123 2124 // Create a FunctionDecl to satisfy the function definition parsing 2125 // code path. 2126 NewFD = FunctionDecl::Create(Context, DC, D.getIdentifierLoc(), 2127 Name, R, SC, isInline, 2128 /*hasPrototype=*/true, 2129 // FIXME: Move to DeclGroup... 2130 D.getDeclSpec().getSourceRange().getBegin()); 2131 D.setInvalidType(); 2132 } 2133 } else if (D.getKind() == Declarator::DK_Conversion) { 2134 if (!DC->isRecord()) { 2135 Diag(D.getIdentifierLoc(), 2136 diag::err_conv_function_not_member); 2137 return 0; 2138 } 2139 2140 CheckConversionDeclarator(D, R, SC); 2141 NewFD = CXXConversionDecl::Create(Context, cast<CXXRecordDecl>(DC), 2142 D.getIdentifierLoc(), Name, R, 2143 isInline, isExplicit); 2144 2145 isVirtualOkay = true; 2146 } else if (DC->isRecord()) { 2147 // If the of the function is the same as the name of the record, then this 2148 // must be an invalid constructor that has a return type. 2149 // (The parser checks for a return type and makes the declarator a 2150 // constructor if it has no return type). 2151 // must have an invalid constructor that has a return type 2152 if (Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ 2153 Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 2154 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2155 << SourceRange(D.getIdentifierLoc()); 2156 return 0; 2157 } 2158 2159 // This is a C++ method declaration. 2160 NewFD = CXXMethodDecl::Create(Context, cast<CXXRecordDecl>(DC), 2161 D.getIdentifierLoc(), Name, R, 2162 (SC == FunctionDecl::Static), isInline); 2163 2164 isVirtualOkay = (SC != FunctionDecl::Static); 2165 } else { 2166 // Determine whether the function was written with a 2167 // prototype. This true when: 2168 // - we're in C++ (where every function has a prototype), 2169 // - there is a prototype in the declarator, or 2170 // - the type R of the function is some kind of typedef or other reference 2171 // to a type name (which eventually refers to a function type). 2172 bool HasPrototype = 2173 getLangOptions().CPlusPlus || 2174 (D.getNumTypeObjects() && D.getTypeObject(0).Fun.hasPrototype) || 2175 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 2176 2177 NewFD = FunctionDecl::Create(Context, DC, 2178 D.getIdentifierLoc(), 2179 Name, R, SC, isInline, HasPrototype, 2180 // FIXME: Move to DeclGroup... 2181 D.getDeclSpec().getSourceRange().getBegin()); 2182 } 2183 2184 if (D.isInvalidType()) 2185 NewFD->setInvalidDecl(); 2186 2187 // Set the lexical context. If the declarator has a C++ 2188 // scope specifier, the lexical context will be different 2189 // from the semantic context. 2190 NewFD->setLexicalDeclContext(CurContext); 2191 2192 // If there is a template parameter list, then we are dealing with a 2193 // template declaration or specialization. 2194 FunctionTemplateDecl *FunctionTemplate = 0; 2195 if (TemplateParamLists.size()) { 2196 // FIXME: member templates! 2197 TemplateParameterList *TemplateParams 2198 = static_cast<TemplateParameterList *>(*TemplateParamLists.release()); 2199 2200 if (TemplateParams->size() > 0) { 2201 // This is a function template 2202 FunctionTemplate = FunctionTemplateDecl::Create(Context, CurContext, 2203 NewFD->getLocation(), 2204 Name, TemplateParams, 2205 NewFD); 2206 NewFD->setDescribedFunctionTemplate(FunctionTemplate); 2207 } else { 2208 // FIXME: Handle function template specializations 2209 } 2210 } 2211 2212 // C++ [dcl.fct.spec]p5: 2213 // The virtual specifier shall only be used in declarations of 2214 // nonstatic class member functions that appear within a 2215 // member-specification of a class declaration; see 10.3. 2216 // 2217 if (isVirtual && !NewFD->isInvalidDecl()) { 2218 if (!isVirtualOkay) { 2219 Diag(D.getDeclSpec().getVirtualSpecLoc(), 2220 diag::err_virtual_non_function); 2221 } else if (!CurContext->isRecord()) { 2222 // 'virtual' was specified outside of the class. 2223 Diag(D.getDeclSpec().getVirtualSpecLoc(), diag::err_virtual_out_of_class) 2224 << CodeModificationHint::CreateRemoval( 2225 SourceRange(D.getDeclSpec().getVirtualSpecLoc())); 2226 } else { 2227 // Okay: Add virtual to the method. 2228 cast<CXXMethodDecl>(NewFD)->setVirtualAsWritten(true); 2229 CXXRecordDecl *CurClass = cast<CXXRecordDecl>(DC); 2230 CurClass->setAggregate(false); 2231 CurClass->setPOD(false); 2232 CurClass->setPolymorphic(true); 2233 CurClass->setHasTrivialConstructor(false); 2234 } 2235 } 2236 2237 if (CXXMethodDecl *NewMD = dyn_cast<CXXMethodDecl>(NewFD)) { 2238 // Look for virtual methods in base classes that this method might override. 2239 2240 BasePaths Paths; 2241 if (LookupInBases(cast<CXXRecordDecl>(DC), 2242 MemberLookupCriteria(NewMD), Paths)) { 2243 for (BasePaths::decl_iterator I = Paths.found_decls_begin(), 2244 E = Paths.found_decls_end(); I != E; ++I) { 2245 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) { 2246 if (!CheckOverridingFunctionReturnType(NewMD, OldMD) && 2247 !CheckOverridingFunctionExceptionSpec(NewMD, OldMD)) 2248 NewMD->addOverriddenMethod(OldMD); 2249 } 2250 } 2251 } 2252 } 2253 2254 if (SC == FunctionDecl::Static && isa<CXXMethodDecl>(NewFD) && 2255 !CurContext->isRecord()) { 2256 // C++ [class.static]p1: 2257 // A data or function member of a class may be declared static 2258 // in a class definition, in which case it is a static member of 2259 // the class. 2260 2261 // Complain about the 'static' specifier if it's on an out-of-line 2262 // member function definition. 2263 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2264 diag::err_static_out_of_line) 2265 << CodeModificationHint::CreateRemoval( 2266 SourceRange(D.getDeclSpec().getStorageClassSpecLoc())); 2267 } 2268 2269 // Handle GNU asm-label extension (encoded as an attribute). 2270 if (Expr *E = (Expr*) D.getAsmLabel()) { 2271 // The parser guarantees this is a string. 2272 StringLiteral *SE = cast<StringLiteral>(E); 2273 NewFD->addAttr(::new (Context) AsmLabelAttr(std::string(SE->getStrData(), 2274 SE->getByteLength()))); 2275 } 2276 2277 // Copy the parameter declarations from the declarator D to the function 2278 // declaration NewFD, if they are available. First scavenge them into Params. 2279 llvm::SmallVector<ParmVarDecl*, 16> Params; 2280 if (D.getNumTypeObjects() > 0) { 2281 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2282 2283 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 2284 // function that takes no arguments, not a function that takes a 2285 // single void argument. 2286 // We let through "const void" here because Sema::GetTypeForDeclarator 2287 // already checks for that case. 2288 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 2289 FTI.ArgInfo[0].Param && 2290 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()) { 2291 // Empty arg list, don't push any params. 2292 ParmVarDecl *Param = FTI.ArgInfo[0].Param.getAs<ParmVarDecl>(); 2293 2294 // In C++, the empty parameter-type-list must be spelled "void"; a 2295 // typedef of void is not permitted. 2296 if (getLangOptions().CPlusPlus && 2297 Param->getType().getUnqualifiedType() != Context.VoidTy) 2298 Diag(Param->getLocation(), diag::err_param_typedef_of_void); 2299 // FIXME: Leaks decl? 2300 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 2301 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) 2302 Params.push_back(FTI.ArgInfo[i].Param.getAs<ParmVarDecl>()); 2303 } 2304 2305 } else if (const FunctionProtoType *FT = R->getAsFunctionProtoType()) { 2306 // When we're declaring a function with a typedef, typeof, etc as in the 2307 // following example, we'll need to synthesize (unnamed) 2308 // parameters for use in the declaration. 2309 // 2310 // @code 2311 // typedef void fn(int); 2312 // fn f; 2313 // @endcode 2314 2315 // Synthesize a parameter for each argument type. 2316 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 2317 AE = FT->arg_type_end(); AI != AE; ++AI) { 2318 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, 2319 SourceLocation(), 0, 2320 *AI, VarDecl::None, 0); 2321 Param->setImplicit(); 2322 Params.push_back(Param); 2323 } 2324 } else { 2325 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && 2326 "Should not need args for typedef of non-prototype fn"); 2327 } 2328 // Finally, we know we have the right number of parameters, install them. 2329 NewFD->setParams(Context, Params.data(), Params.size()); 2330 2331 // If name lookup finds a previous declaration that is not in the 2332 // same scope as the new declaration, this may still be an 2333 // acceptable redeclaration. 2334 if (PrevDecl && !isDeclInScope(PrevDecl, DC, S) && 2335 !(NewFD->hasLinkage() && 2336 isOutOfScopePreviousDeclaration(PrevDecl, DC, Context))) 2337 PrevDecl = 0; 2338 2339 // Perform semantic checking on the function declaration. 2340 bool OverloadableAttrRequired = false; // FIXME: HACK! 2341 CheckFunctionDeclaration(NewFD, PrevDecl, Redeclaration, 2342 /*FIXME:*/OverloadableAttrRequired); 2343 2344 if (D.getCXXScopeSpec().isSet() && !NewFD->isInvalidDecl()) { 2345 // An out-of-line member function declaration must also be a 2346 // definition (C++ [dcl.meaning]p1). 2347 if (!IsFunctionDefinition) { 2348 Diag(NewFD->getLocation(), diag::err_out_of_line_declaration) 2349 << D.getCXXScopeSpec().getRange(); 2350 NewFD->setInvalidDecl(); 2351 } else if (!Redeclaration && (!PrevDecl || !isa<UsingDecl>(PrevDecl))) { 2352 // The user tried to provide an out-of-line definition for a 2353 // function that is a member of a class or namespace, but there 2354 // was no such member function declared (C++ [class.mfct]p2, 2355 // C++ [namespace.memdef]p2). For example: 2356 // 2357 // class X { 2358 // void f() const; 2359 // }; 2360 // 2361 // void X::f() { } // ill-formed 2362 // 2363 // Complain about this problem, and attempt to suggest close 2364 // matches (e.g., those that differ only in cv-qualifiers and 2365 // whether the parameter types are references). 2366 Diag(D.getIdentifierLoc(), diag::err_member_def_does_not_match) 2367 << cast<NamedDecl>(DC) << D.getCXXScopeSpec().getRange(); 2368 NewFD->setInvalidDecl(); 2369 2370 LookupResult Prev = LookupQualifiedName(DC, Name, LookupOrdinaryName, 2371 true); 2372 assert(!Prev.isAmbiguous() && 2373 "Cannot have an ambiguity in previous-declaration lookup"); 2374 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 2375 Func != FuncEnd; ++Func) { 2376 if (isa<FunctionDecl>(*Func) && 2377 isNearlyMatchingFunction(Context, cast<FunctionDecl>(*Func), NewFD)) 2378 Diag((*Func)->getLocation(), diag::note_member_def_close_match); 2379 } 2380 2381 PrevDecl = 0; 2382 } 2383 } 2384 2385 // Handle attributes. We need to have merged decls when handling attributes 2386 // (for example to check for conflicts, etc). 2387 // FIXME: This needs to happen before we merge declarations. Then, 2388 // let attribute merging cope with attribute conflicts. 2389 ProcessDeclAttributes(S, NewFD, D); 2390 AddKnownFunctionAttributes(NewFD); 2391 2392 if (OverloadableAttrRequired && !NewFD->getAttr<OverloadableAttr>()) { 2393 // If a function name is overloadable in C, then every function 2394 // with that name must be marked "overloadable". 2395 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 2396 << Redeclaration << NewFD; 2397 if (PrevDecl) 2398 Diag(PrevDecl->getLocation(), 2399 diag::note_attribute_overloadable_prev_overload); 2400 NewFD->addAttr(::new (Context) OverloadableAttr()); 2401 } 2402 2403 // If this is a locally-scoped extern C function, update the 2404 // map of such names. 2405 if (CurContext->isFunctionOrMethod() && NewFD->isExternC(Context) 2406 && !NewFD->isInvalidDecl()) 2407 RegisterLocallyScopedExternCDecl(NewFD, PrevDecl, S); 2408 2409 // Set this FunctionDecl's range up to the right paren. 2410 NewFD->setLocEnd(D.getSourceRange().getEnd()); 2411 2412 if (FunctionTemplate && NewFD->isInvalidDecl()) 2413 FunctionTemplate->setInvalidDecl(); 2414 2415 if (FunctionTemplate) 2416 return FunctionTemplate; 2417 2418 return NewFD; 2419} 2420 2421/// \brief Perform semantic checking of a new function declaration. 2422/// 2423/// Performs semantic analysis of the new function declaration 2424/// NewFD. This routine performs all semantic checking that does not 2425/// require the actual declarator involved in the declaration, and is 2426/// used both for the declaration of functions as they are parsed 2427/// (called via ActOnDeclarator) and for the declaration of functions 2428/// that have been instantiated via C++ template instantiation (called 2429/// via InstantiateDecl). 2430/// 2431/// This sets NewFD->isInvalidDecl() to true if there was an error. 2432void Sema::CheckFunctionDeclaration(FunctionDecl *NewFD, NamedDecl *&PrevDecl, 2433 bool &Redeclaration, 2434 bool &OverloadableAttrRequired) { 2435 // If NewFD is already known erroneous, don't do any of this checking. 2436 if (NewFD->isInvalidDecl()) 2437 return; 2438 2439 if (NewFD->getResultType()->isVariablyModifiedType()) { 2440 // Functions returning a variably modified type violate C99 6.7.5.2p2 2441 // because all functions have linkage. 2442 Diag(NewFD->getLocation(), diag::err_vm_func_decl); 2443 return NewFD->setInvalidDecl(); 2444 } 2445 2446 // Semantic checking for this function declaration (in isolation). 2447 if (getLangOptions().CPlusPlus) { 2448 // C++-specific checks. 2449 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { 2450 CheckConstructor(Constructor); 2451 } else if (isa<CXXDestructorDecl>(NewFD)) { 2452 CXXRecordDecl *Record = cast<CXXRecordDecl>(NewFD->getParent()); 2453 Record->setUserDeclaredDestructor(true); 2454 // C++ [class]p4: A POD-struct is an aggregate class that has [...] no 2455 // user-defined destructor. 2456 Record->setPOD(false); 2457 2458 // C++ [class.dtor]p3: A destructor is trivial if it is an implicitly- 2459 // declared destructor. 2460 Record->setHasTrivialDestructor(false); 2461 } else if (CXXConversionDecl *Conversion 2462 = dyn_cast<CXXConversionDecl>(NewFD)) 2463 ActOnConversionDeclarator(Conversion); 2464 2465 // Extra checking for C++ overloaded operators (C++ [over.oper]). 2466 if (NewFD->isOverloadedOperator() && 2467 CheckOverloadedOperatorDeclaration(NewFD)) 2468 return NewFD->setInvalidDecl(); 2469 } 2470 2471 // C99 6.7.4p6: 2472 // [... ] For a function with external linkage, the following 2473 // restrictions apply: [...] If all of the file scope declarations 2474 // for a function in a translation unit include the inline 2475 // function specifier without extern, then the definition in that 2476 // translation unit is an inline definition. An inline definition 2477 // does not provide an external definition for the function, and 2478 // does not forbid an external definition in another translation 2479 // unit. 2480 // 2481 // Here we determine whether this function, in isolation, would be a 2482 // C99 inline definition. MergeCompatibleFunctionDecls looks at 2483 // previous declarations. 2484 if (NewFD->isInline() && getLangOptions().C99 && 2485 NewFD->getStorageClass() == FunctionDecl::None && 2486 NewFD->getDeclContext()->getLookupContext()->isTranslationUnit()) 2487 NewFD->setC99InlineDefinition(true); 2488 2489 // Check for a previous declaration of this name. 2490 if (!PrevDecl && NewFD->isExternC(Context)) { 2491 // Since we did not find anything by this name and we're declaring 2492 // an extern "C" function, look for a non-visible extern "C" 2493 // declaration with the same name. 2494 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 2495 = LocallyScopedExternalDecls.find(NewFD->getDeclName()); 2496 if (Pos != LocallyScopedExternalDecls.end()) 2497 PrevDecl = Pos->second; 2498 } 2499 2500 // Merge or overload the declaration with an existing declaration of 2501 // the same name, if appropriate. 2502 if (PrevDecl) { 2503 // Determine whether NewFD is an overload of PrevDecl or 2504 // a declaration that requires merging. If it's an overload, 2505 // there's no more work to do here; we'll just add the new 2506 // function to the scope. 2507 OverloadedFunctionDecl::function_iterator MatchedDecl; 2508 2509 if (!getLangOptions().CPlusPlus && 2510 AllowOverloadingOfFunction(PrevDecl, Context)) { 2511 OverloadableAttrRequired = true; 2512 2513 // Functions marked "overloadable" must have a prototype (that 2514 // we can't get through declaration merging). 2515 if (!NewFD->getType()->getAsFunctionProtoType()) { 2516 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_no_prototype) 2517 << NewFD; 2518 Redeclaration = true; 2519 2520 // Turn this into a variadic function with no parameters. 2521 QualType R = Context.getFunctionType( 2522 NewFD->getType()->getAsFunctionType()->getResultType(), 2523 0, 0, true, 0); 2524 NewFD->setType(R); 2525 return NewFD->setInvalidDecl(); 2526 } 2527 } 2528 2529 if (PrevDecl && 2530 (!AllowOverloadingOfFunction(PrevDecl, Context) || 2531 !IsOverload(NewFD, PrevDecl, MatchedDecl)) && 2532 !isa<UsingDecl>(PrevDecl)) { 2533 Redeclaration = true; 2534 Decl *OldDecl = PrevDecl; 2535 2536 // If PrevDecl was an overloaded function, extract the 2537 // FunctionDecl that matched. 2538 if (isa<OverloadedFunctionDecl>(PrevDecl)) 2539 OldDecl = *MatchedDecl; 2540 2541 // NewFD and OldDecl represent declarations that need to be 2542 // merged. 2543 if (MergeFunctionDecl(NewFD, OldDecl)) 2544 return NewFD->setInvalidDecl(); 2545 2546 if (FunctionTemplateDecl *OldTemplateDecl 2547 = dyn_cast<FunctionTemplateDecl>(OldDecl)) 2548 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl()); 2549 else 2550 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 2551 } 2552 } 2553 2554 // In C++, check default arguments now that we have merged decls. Unless 2555 // the lexical context is the class, because in this case this is done 2556 // during delayed parsing anyway. 2557 if (getLangOptions().CPlusPlus && !CurContext->isRecord()) 2558 CheckCXXDefaultArguments(NewFD); 2559} 2560 2561bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 2562 // FIXME: Need strict checking. In C89, we need to check for 2563 // any assignment, increment, decrement, function-calls, or 2564 // commas outside of a sizeof. In C99, it's the same list, 2565 // except that the aforementioned are allowed in unevaluated 2566 // expressions. Everything else falls under the 2567 // "may accept other forms of constant expressions" exception. 2568 // (We never end up here for C++, so the constant expression 2569 // rules there don't matter.) 2570 if (Init->isConstantInitializer(Context)) 2571 return false; 2572 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 2573 << Init->getSourceRange(); 2574 return true; 2575} 2576 2577void Sema::AddInitializerToDecl(DeclPtrTy dcl, FullExprArg init) { 2578 AddInitializerToDecl(dcl, init.release(), /*DirectInit=*/false); 2579} 2580 2581/// AddInitializerToDecl - Adds the initializer Init to the 2582/// declaration dcl. If DirectInit is true, this is C++ direct 2583/// initialization rather than copy initialization. 2584void Sema::AddInitializerToDecl(DeclPtrTy dcl, ExprArg init, bool DirectInit) { 2585 Decl *RealDecl = dcl.getAs<Decl>(); 2586 // If there is no declaration, there was an error parsing it. Just ignore 2587 // the initializer. 2588 if (RealDecl == 0) 2589 return; 2590 2591 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 2592 // With declarators parsed the way they are, the parser cannot 2593 // distinguish between a normal initializer and a pure-specifier. 2594 // Thus this grotesque test. 2595 IntegerLiteral *IL; 2596 Expr *Init = static_cast<Expr *>(init.get()); 2597 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 2598 Context.getCanonicalType(IL->getType()) == Context.IntTy) { 2599 if (Method->isVirtualAsWritten()) { 2600 Method->setPure(); 2601 2602 // A class is abstract if at least one function is pure virtual. 2603 cast<CXXRecordDecl>(CurContext)->setAbstract(true); 2604 } else if (!Method->isInvalidDecl()) { 2605 Diag(Method->getLocation(), diag::err_non_virtual_pure) 2606 << Method->getDeclName() << Init->getSourceRange(); 2607 Method->setInvalidDecl(); 2608 } 2609 } else { 2610 Diag(Method->getLocation(), diag::err_member_function_initialization) 2611 << Method->getDeclName() << Init->getSourceRange(); 2612 Method->setInvalidDecl(); 2613 } 2614 return; 2615 } 2616 2617 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 2618 if (!VDecl) { 2619 if (getLangOptions().CPlusPlus && 2620 RealDecl->getLexicalDeclContext()->isRecord() && 2621 isa<NamedDecl>(RealDecl)) 2622 Diag(RealDecl->getLocation(), diag::err_member_initialization) 2623 << cast<NamedDecl>(RealDecl)->getDeclName(); 2624 else 2625 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 2626 RealDecl->setInvalidDecl(); 2627 return; 2628 } 2629 2630 if (!VDecl->getType()->isArrayType() && 2631 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 2632 diag::err_typecheck_decl_incomplete_type)) { 2633 RealDecl->setInvalidDecl(); 2634 return; 2635 } 2636 2637 const VarDecl *Def = 0; 2638 if (VDecl->getDefinition(Def)) { 2639 Diag(VDecl->getLocation(), diag::err_redefinition) 2640 << VDecl->getDeclName(); 2641 Diag(Def->getLocation(), diag::note_previous_definition); 2642 VDecl->setInvalidDecl(); 2643 return; 2644 } 2645 2646 // Take ownership of the expression, now that we're sure we have somewhere 2647 // to put it. 2648 Expr *Init = init.takeAs<Expr>(); 2649 assert(Init && "missing initializer"); 2650 2651 // Get the decls type and save a reference for later, since 2652 // CheckInitializerTypes may change it. 2653 QualType DclT = VDecl->getType(), SavT = DclT; 2654 if (VDecl->isBlockVarDecl()) { 2655 if (VDecl->hasExternalStorage()) { // C99 6.7.8p5 2656 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 2657 VDecl->setInvalidDecl(); 2658 } else if (!VDecl->isInvalidDecl()) { 2659 if (CheckInitializerTypes(Init, DclT, VDecl->getLocation(), 2660 VDecl->getDeclName(), DirectInit)) 2661 VDecl->setInvalidDecl(); 2662 2663 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 2664 // Don't check invalid declarations to avoid emitting useless diagnostics. 2665 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 2666 if (VDecl->getStorageClass() == VarDecl::Static) // C99 6.7.8p4. 2667 CheckForConstantInitializer(Init, DclT); 2668 } 2669 } 2670 } else if (VDecl->isStaticDataMember() && 2671 VDecl->getLexicalDeclContext()->isRecord()) { 2672 // This is an in-class initialization for a static data member, e.g., 2673 // 2674 // struct S { 2675 // static const int value = 17; 2676 // }; 2677 2678 // Attach the initializer 2679 VDecl->setInit(Context, Init); 2680 2681 // C++ [class.mem]p4: 2682 // A member-declarator can contain a constant-initializer only 2683 // if it declares a static member (9.4) of const integral or 2684 // const enumeration type, see 9.4.2. 2685 QualType T = VDecl->getType(); 2686 if (!T->isDependentType() && 2687 (!Context.getCanonicalType(T).isConstQualified() || 2688 !T->isIntegralType())) { 2689 Diag(VDecl->getLocation(), diag::err_member_initialization) 2690 << VDecl->getDeclName() << Init->getSourceRange(); 2691 VDecl->setInvalidDecl(); 2692 } else { 2693 // C++ [class.static.data]p4: 2694 // If a static data member is of const integral or const 2695 // enumeration type, its declaration in the class definition 2696 // can specify a constant-initializer which shall be an 2697 // integral constant expression (5.19). 2698 if (!Init->isTypeDependent() && 2699 !Init->getType()->isIntegralType()) { 2700 // We have a non-dependent, non-integral or enumeration type. 2701 Diag(Init->getSourceRange().getBegin(), 2702 diag::err_in_class_initializer_non_integral_type) 2703 << Init->getType() << Init->getSourceRange(); 2704 VDecl->setInvalidDecl(); 2705 } else if (!Init->isTypeDependent() && !Init->isValueDependent()) { 2706 // Check whether the expression is a constant expression. 2707 llvm::APSInt Value; 2708 SourceLocation Loc; 2709 if (!Init->isIntegerConstantExpr(Value, Context, &Loc)) { 2710 Diag(Loc, diag::err_in_class_initializer_non_constant) 2711 << Init->getSourceRange(); 2712 VDecl->setInvalidDecl(); 2713 } else if (!VDecl->getType()->isDependentType()) 2714 ImpCastExprToType(Init, VDecl->getType()); 2715 } 2716 } 2717 } else if (VDecl->isFileVarDecl()) { 2718 if (VDecl->getStorageClass() == VarDecl::Extern) 2719 Diag(VDecl->getLocation(), diag::warn_extern_init); 2720 if (!VDecl->isInvalidDecl()) 2721 if (CheckInitializerTypes(Init, DclT, VDecl->getLocation(), 2722 VDecl->getDeclName(), DirectInit)) 2723 VDecl->setInvalidDecl(); 2724 2725 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 2726 // Don't check invalid declarations to avoid emitting useless diagnostics. 2727 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 2728 // C99 6.7.8p4. All file scoped initializers need to be constant. 2729 CheckForConstantInitializer(Init, DclT); 2730 } 2731 } 2732 // If the type changed, it means we had an incomplete type that was 2733 // completed by the initializer. For example: 2734 // int ary[] = { 1, 3, 5 }; 2735 // "ary" transitions from a VariableArrayType to a ConstantArrayType. 2736 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 2737 VDecl->setType(DclT); 2738 Init->setType(DclT); 2739 } 2740 2741 // Attach the initializer to the decl. 2742 VDecl->setInit(Context, Init); 2743 2744 // If the previous declaration of VDecl was a tentative definition, 2745 // remove it from the set of tentative definitions. 2746 if (VDecl->getPreviousDeclaration() && 2747 VDecl->getPreviousDeclaration()->isTentativeDefinition(Context)) { 2748 llvm::DenseMap<DeclarationName, VarDecl *>::iterator Pos 2749 = TentativeDefinitions.find(VDecl->getDeclName()); 2750 assert(Pos != TentativeDefinitions.end() && 2751 "Unrecorded tentative definition?"); 2752 TentativeDefinitions.erase(Pos); 2753 } 2754 2755 return; 2756} 2757 2758void Sema::ActOnUninitializedDecl(DeclPtrTy dcl, 2759 bool TypeContainsUndeducedAuto) { 2760 Decl *RealDecl = dcl.getAs<Decl>(); 2761 2762 // If there is no declaration, there was an error parsing it. Just ignore it. 2763 if (RealDecl == 0) 2764 return; 2765 2766 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 2767 QualType Type = Var->getType(); 2768 2769 // Record tentative definitions. 2770 if (Var->isTentativeDefinition(Context)) 2771 TentativeDefinitions[Var->getDeclName()] = Var; 2772 2773 // C++ [dcl.init.ref]p3: 2774 // The initializer can be omitted for a reference only in a 2775 // parameter declaration (8.3.5), in the declaration of a 2776 // function return type, in the declaration of a class member 2777 // within its class declaration (9.2), and where the extern 2778 // specifier is explicitly used. 2779 if (Type->isReferenceType() && !Var->hasExternalStorage()) { 2780 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 2781 << Var->getDeclName() 2782 << SourceRange(Var->getLocation(), Var->getLocation()); 2783 Var->setInvalidDecl(); 2784 return; 2785 } 2786 2787 // C++0x [dcl.spec.auto]p3 2788 if (TypeContainsUndeducedAuto) { 2789 Diag(Var->getLocation(), diag::err_auto_var_requires_init) 2790 << Var->getDeclName() << Type; 2791 Var->setInvalidDecl(); 2792 return; 2793 } 2794 2795 // C++ [dcl.init]p9: 2796 // 2797 // If no initializer is specified for an object, and the object 2798 // is of (possibly cv-qualified) non-POD class type (or array 2799 // thereof), the object shall be default-initialized; if the 2800 // object is of const-qualified type, the underlying class type 2801 // shall have a user-declared default constructor. 2802 if (getLangOptions().CPlusPlus) { 2803 QualType InitType = Type; 2804 if (const ArrayType *Array = Context.getAsArrayType(Type)) 2805 InitType = Array->getElementType(); 2806 if ((!Var->hasExternalStorage() && !Var->isExternC(Context)) && 2807 InitType->isRecordType() && !InitType->isDependentType()) { 2808 CXXRecordDecl *RD = 2809 cast<CXXRecordDecl>(InitType->getAsRecordType()->getDecl()); 2810 CXXConstructorDecl *Constructor = 0; 2811 if (!RequireCompleteType(Var->getLocation(), InitType, 2812 diag::err_invalid_incomplete_type_use)) 2813 Constructor 2814 = PerformInitializationByConstructor(InitType, 0, 0, 2815 Var->getLocation(), 2816 SourceRange(Var->getLocation(), 2817 Var->getLocation()), 2818 Var->getDeclName(), 2819 IK_Default); 2820 if (!Constructor) 2821 Var->setInvalidDecl(); 2822 else { 2823 if (!RD->hasTrivialConstructor()) 2824 InitializeVarWithConstructor(Var, Constructor, InitType, 0, 0); 2825 // FIXME. Must do all that is needed to destroy the object 2826 // on scope exit. For now, just mark the destructor as used. 2827 MarkDestructorReferenced(Var->getLocation(), InitType); 2828 } 2829 } 2830 } 2831 2832#if 0 2833 // FIXME: Temporarily disabled because we are not properly parsing 2834 // linkage specifications on declarations, e.g., 2835 // 2836 // extern "C" const CGPoint CGPointerZero; 2837 // 2838 // C++ [dcl.init]p9: 2839 // 2840 // If no initializer is specified for an object, and the 2841 // object is of (possibly cv-qualified) non-POD class type (or 2842 // array thereof), the object shall be default-initialized; if 2843 // the object is of const-qualified type, the underlying class 2844 // type shall have a user-declared default 2845 // constructor. Otherwise, if no initializer is specified for 2846 // an object, the object and its subobjects, if any, have an 2847 // indeterminate initial value; if the object or any of its 2848 // subobjects are of const-qualified type, the program is 2849 // ill-formed. 2850 // 2851 // This isn't technically an error in C, so we don't diagnose it. 2852 // 2853 // FIXME: Actually perform the POD/user-defined default 2854 // constructor check. 2855 if (getLangOptions().CPlusPlus && 2856 Context.getCanonicalType(Type).isConstQualified() && 2857 !Var->hasExternalStorage()) 2858 Diag(Var->getLocation(), diag::err_const_var_requires_init) 2859 << Var->getName() 2860 << SourceRange(Var->getLocation(), Var->getLocation()); 2861#endif 2862 } 2863} 2864 2865Sema::DeclGroupPtrTy Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, 2866 DeclPtrTy *Group, 2867 unsigned NumDecls) { 2868 llvm::SmallVector<Decl*, 8> Decls; 2869 2870 if (DS.isTypeSpecOwned()) 2871 Decls.push_back((Decl*)DS.getTypeRep()); 2872 2873 for (unsigned i = 0; i != NumDecls; ++i) 2874 if (Decl *D = Group[i].getAs<Decl>()) 2875 Decls.push_back(D); 2876 2877 // Perform semantic analysis that depends on having fully processed both 2878 // the declarator and initializer. 2879 for (unsigned i = 0, e = Decls.size(); i != e; ++i) { 2880 VarDecl *IDecl = dyn_cast<VarDecl>(Decls[i]); 2881 if (!IDecl) 2882 continue; 2883 QualType T = IDecl->getType(); 2884 2885 // Block scope. C99 6.7p7: If an identifier for an object is declared with 2886 // no linkage (C99 6.2.2p6), the type for the object shall be complete... 2887 if (IDecl->isBlockVarDecl() && !IDecl->hasExternalStorage()) { 2888 if (!IDecl->isInvalidDecl() && 2889 RequireCompleteType(IDecl->getLocation(), T, 2890 diag::err_typecheck_decl_incomplete_type)) 2891 IDecl->setInvalidDecl(); 2892 } 2893 // File scope. C99 6.9.2p2: A declaration of an identifier for and 2894 // object that has file scope without an initializer, and without a 2895 // storage-class specifier or with the storage-class specifier "static", 2896 // constitutes a tentative definition. Note: A tentative definition with 2897 // external linkage is valid (C99 6.2.2p5). 2898 if (IDecl->isTentativeDefinition(Context)) { 2899 QualType CheckType = T; 2900 unsigned DiagID = diag::err_typecheck_decl_incomplete_type; 2901 2902 const IncompleteArrayType *ArrayT = Context.getAsIncompleteArrayType(T); 2903 if (ArrayT) { 2904 CheckType = ArrayT->getElementType(); 2905 DiagID = diag::err_illegal_decl_array_incomplete_type; 2906 } 2907 2908 if (IDecl->isInvalidDecl()) { 2909 // Do nothing with invalid declarations 2910 } else if ((ArrayT || IDecl->getStorageClass() == VarDecl::Static) && 2911 RequireCompleteType(IDecl->getLocation(), CheckType, DiagID)) { 2912 // C99 6.9.2p3: If the declaration of an identifier for an object is 2913 // a tentative definition and has internal linkage (C99 6.2.2p3), the 2914 // declared type shall not be an incomplete type. 2915 IDecl->setInvalidDecl(); 2916 } 2917 } 2918 } 2919 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, 2920 Decls.data(), Decls.size())); 2921} 2922 2923 2924/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 2925/// to introduce parameters into function prototype scope. 2926Sema::DeclPtrTy 2927Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 2928 const DeclSpec &DS = D.getDeclSpec(); 2929 2930 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 2931 VarDecl::StorageClass StorageClass = VarDecl::None; 2932 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 2933 StorageClass = VarDecl::Register; 2934 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 2935 Diag(DS.getStorageClassSpecLoc(), 2936 diag::err_invalid_storage_class_in_func_decl); 2937 D.getMutableDeclSpec().ClearStorageClassSpecs(); 2938 } 2939 2940 if (D.getDeclSpec().isThreadSpecified()) 2941 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 2942 2943 DiagnoseFunctionSpecifiers(D); 2944 2945 // Check that there are no default arguments inside the type of this 2946 // parameter (C++ only). 2947 if (getLangOptions().CPlusPlus) 2948 CheckExtraCXXDefaultArguments(D); 2949 2950 TagDecl *OwnedDecl = 0; 2951 QualType parmDeclType = GetTypeForDeclarator(D, S, /*Skip=*/0, &OwnedDecl); 2952 2953 if (getLangOptions().CPlusPlus && OwnedDecl && OwnedDecl->isDefinition()) { 2954 // C++ [dcl.fct]p6: 2955 // Types shall not be defined in return or parameter types. 2956 Diag(OwnedDecl->getLocation(), diag::err_type_defined_in_param_type) 2957 << Context.getTypeDeclType(OwnedDecl); 2958 } 2959 2960 // TODO: CHECK FOR CONFLICTS, multiple decls with same name in one scope. 2961 // Can this happen for params? We already checked that they don't conflict 2962 // among each other. Here they can only shadow globals, which is ok. 2963 IdentifierInfo *II = D.getIdentifier(); 2964 if (II) { 2965 if (NamedDecl *PrevDecl = LookupName(S, II, LookupOrdinaryName)) { 2966 if (PrevDecl->isTemplateParameter()) { 2967 // Maybe we will complain about the shadowed template parameter. 2968 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 2969 // Just pretend that we didn't see the previous declaration. 2970 PrevDecl = 0; 2971 } else if (S->isDeclScope(DeclPtrTy::make(PrevDecl))) { 2972 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 2973 2974 // Recover by removing the name 2975 II = 0; 2976 D.SetIdentifier(0, D.getIdentifierLoc()); 2977 } 2978 } 2979 } 2980 2981 // Parameters can not be abstract class types. 2982 // For record types, this is done by the AbstractClassUsageDiagnoser once 2983 // the class has been completely parsed. 2984 if (!CurContext->isRecord() && 2985 RequireNonAbstractType(D.getIdentifierLoc(), parmDeclType, 2986 diag::err_abstract_type_in_decl, 2987 AbstractParamType)) 2988 D.setInvalidType(true); 2989 2990 QualType T = adjustParameterType(parmDeclType); 2991 2992 ParmVarDecl *New; 2993 if (T == parmDeclType) // parameter type did not need adjustment 2994 New = ParmVarDecl::Create(Context, CurContext, 2995 D.getIdentifierLoc(), II, 2996 parmDeclType, StorageClass, 2997 0); 2998 else // keep track of both the adjusted and unadjusted types 2999 New = OriginalParmVarDecl::Create(Context, CurContext, 3000 D.getIdentifierLoc(), II, T, 3001 parmDeclType, StorageClass, 0); 3002 3003 if (D.isInvalidType()) 3004 New->setInvalidDecl(); 3005 3006 // Parameter declarators cannot be interface types. All ObjC objects are 3007 // passed by reference. 3008 if (T->isObjCInterfaceType()) { 3009 Diag(D.getIdentifierLoc(), 3010 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T; 3011 New->setInvalidDecl(); 3012 } 3013 3014 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 3015 if (D.getCXXScopeSpec().isSet()) { 3016 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 3017 << D.getCXXScopeSpec().getRange(); 3018 New->setInvalidDecl(); 3019 } 3020 3021 // Add the parameter declaration into this scope. 3022 S->AddDecl(DeclPtrTy::make(New)); 3023 if (II) 3024 IdResolver.AddDecl(New); 3025 3026 ProcessDeclAttributes(S, New, D); 3027 3028 if (New->hasAttr<BlocksAttr>()) { 3029 Diag(New->getLocation(), diag::err_block_on_nonlocal); 3030 } 3031 return DeclPtrTy::make(New); 3032} 3033 3034void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 3035 SourceLocation LocAfterDecls) { 3036 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 3037 "Not a function declarator!"); 3038 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 3039 3040 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 3041 // for a K&R function. 3042 if (!FTI.hasPrototype) { 3043 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 3044 --i; 3045 if (FTI.ArgInfo[i].Param == 0) { 3046 std::string Code = " int "; 3047 Code += FTI.ArgInfo[i].Ident->getName(); 3048 Code += ";\n"; 3049 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 3050 << FTI.ArgInfo[i].Ident 3051 << CodeModificationHint::CreateInsertion(LocAfterDecls, Code); 3052 3053 // Implicitly declare the argument as type 'int' for lack of a better 3054 // type. 3055 DeclSpec DS; 3056 const char* PrevSpec; // unused 3057 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 3058 PrevSpec); 3059 Declarator ParamD(DS, Declarator::KNRTypeListContext); 3060 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 3061 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 3062 } 3063 } 3064 } 3065} 3066 3067Sema::DeclPtrTy Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, 3068 Declarator &D) { 3069 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 3070 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 3071 "Not a function declarator!"); 3072 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 3073 3074 if (FTI.hasPrototype) { 3075 // FIXME: Diagnose arguments without names in C. 3076 } 3077 3078 Scope *ParentScope = FnBodyScope->getParent(); 3079 3080 DeclPtrTy DP = HandleDeclarator(ParentScope, D, 3081 MultiTemplateParamsArg(*this), 3082 /*IsFunctionDefinition=*/true); 3083 return ActOnStartOfFunctionDef(FnBodyScope, DP); 3084} 3085 3086Sema::DeclPtrTy Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, DeclPtrTy D) { 3087 if (!D) 3088 return D; 3089 FunctionDecl *FD = cast<FunctionDecl>(D.getAs<Decl>()); 3090 3091 CurFunctionNeedsScopeChecking = false; 3092 3093 // See if this is a redefinition. 3094 const FunctionDecl *Definition; 3095 if (FD->getBody(Definition)) { 3096 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 3097 Diag(Definition->getLocation(), diag::note_previous_definition); 3098 } 3099 3100 // Builtin functions cannot be defined. 3101 if (unsigned BuiltinID = FD->getBuiltinID(Context)) { 3102 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 3103 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 3104 FD->setInvalidDecl(); 3105 } 3106 } 3107 3108 // The return type of a function definition must be complete 3109 // (C99 6.9.1p3, C++ [dcl.fct]p6). 3110 QualType ResultType = FD->getResultType(); 3111 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 3112 !FD->isInvalidDecl() && 3113 RequireCompleteType(FD->getLocation(), ResultType, 3114 diag::err_func_def_incomplete_result)) 3115 FD->setInvalidDecl(); 3116 3117 // GNU warning -Wmissing-prototypes: 3118 // Warn if a global function is defined without a previous 3119 // prototype declaration. This warning is issued even if the 3120 // definition itself provides a prototype. The aim is to detect 3121 // global functions that fail to be declared in header files. 3122 if (!FD->isInvalidDecl() && FD->isGlobal() && !isa<CXXMethodDecl>(FD) && 3123 !FD->isMain()) { 3124 bool MissingPrototype = true; 3125 for (const FunctionDecl *Prev = FD->getPreviousDeclaration(); 3126 Prev; Prev = Prev->getPreviousDeclaration()) { 3127 // Ignore any declarations that occur in function or method 3128 // scope, because they aren't visible from the header. 3129 if (Prev->getDeclContext()->isFunctionOrMethod()) 3130 continue; 3131 3132 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 3133 break; 3134 } 3135 3136 if (MissingPrototype) 3137 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 3138 } 3139 3140 if (FnBodyScope) 3141 PushDeclContext(FnBodyScope, FD); 3142 3143 // Check the validity of our function parameters 3144 CheckParmsForFunctionDef(FD); 3145 3146 // Introduce our parameters into the function scope 3147 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 3148 ParmVarDecl *Param = FD->getParamDecl(p); 3149 Param->setOwningFunction(FD); 3150 3151 // If this has an identifier, add it to the scope stack. 3152 if (Param->getIdentifier() && FnBodyScope) 3153 PushOnScopeChains(Param, FnBodyScope); 3154 } 3155 3156 // Checking attributes of current function definition 3157 // dllimport attribute. 3158 if (FD->getAttr<DLLImportAttr>() && 3159 (!FD->getAttr<DLLExportAttr>())) { 3160 // dllimport attribute cannot be applied to definition. 3161 if (!(FD->getAttr<DLLImportAttr>())->isInherited()) { 3162 Diag(FD->getLocation(), 3163 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 3164 << "dllimport"; 3165 FD->setInvalidDecl(); 3166 return DeclPtrTy::make(FD); 3167 } else { 3168 // If a symbol previously declared dllimport is later defined, the 3169 // attribute is ignored in subsequent references, and a warning is 3170 // emitted. 3171 Diag(FD->getLocation(), 3172 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 3173 << FD->getNameAsCString() << "dllimport"; 3174 } 3175 } 3176 return DeclPtrTy::make(FD); 3177} 3178 3179Sema::DeclPtrTy Sema::ActOnFinishFunctionBody(DeclPtrTy D, StmtArg BodyArg) { 3180 return ActOnFinishFunctionBody(D, move(BodyArg), false); 3181} 3182 3183Sema::DeclPtrTy Sema::ActOnFinishFunctionBody(DeclPtrTy D, StmtArg BodyArg, 3184 bool IsInstantiation) { 3185 Decl *dcl = D.getAs<Decl>(); 3186 Stmt *Body = BodyArg.takeAs<Stmt>(); 3187 if (FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(dcl)) { 3188 FD->setBody(Body); 3189 3190 if (!FD->isInvalidDecl()) 3191 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end()); 3192 3193 // C++ [basic.def.odr]p2: 3194 // [...] A virtual member function is used if it is not pure. [...] 3195 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FD)) 3196 if (Method->isVirtual() && !Method->isPure()) 3197 MarkDeclarationReferenced(Method->getLocation(), Method); 3198 3199 assert(FD == getCurFunctionDecl() && "Function parsing confused"); 3200 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 3201 assert(MD == getCurMethodDecl() && "Method parsing confused"); 3202 MD->setBody(Body); 3203 3204 if (!MD->isInvalidDecl()) 3205 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end()); 3206 } else { 3207 Body->Destroy(Context); 3208 return DeclPtrTy(); 3209 } 3210 if (!IsInstantiation) 3211 PopDeclContext(); 3212 3213 // Verify and clean out per-function state. 3214 3215 assert(&getLabelMap() == &FunctionLabelMap && "Didn't pop block right?"); 3216 3217 // Check goto/label use. 3218 for (llvm::DenseMap<IdentifierInfo*, LabelStmt*>::iterator 3219 I = FunctionLabelMap.begin(), E = FunctionLabelMap.end(); I != E; ++I) { 3220 LabelStmt *L = I->second; 3221 3222 // Verify that we have no forward references left. If so, there was a goto 3223 // or address of a label taken, but no definition of it. Label fwd 3224 // definitions are indicated with a null substmt. 3225 if (L->getSubStmt() != 0) 3226 continue; 3227 3228 // Emit error. 3229 Diag(L->getIdentLoc(), diag::err_undeclared_label_use) << L->getName(); 3230 3231 // At this point, we have gotos that use the bogus label. Stitch it into 3232 // the function body so that they aren't leaked and that the AST is well 3233 // formed. 3234 if (Body == 0) { 3235 // The whole function wasn't parsed correctly, just delete this. 3236 L->Destroy(Context); 3237 continue; 3238 } 3239 3240 // Otherwise, the body is valid: we want to stitch the label decl into the 3241 // function somewhere so that it is properly owned and so that the goto 3242 // has a valid target. Do this by creating a new compound stmt with the 3243 // label in it. 3244 3245 // Give the label a sub-statement. 3246 L->setSubStmt(new (Context) NullStmt(L->getIdentLoc())); 3247 3248 CompoundStmt *Compound = isa<CXXTryStmt>(Body) ? 3249 cast<CXXTryStmt>(Body)->getTryBlock() : 3250 cast<CompoundStmt>(Body); 3251 std::vector<Stmt*> Elements(Compound->body_begin(), Compound->body_end()); 3252 Elements.push_back(L); 3253 Compound->setStmts(Context, &Elements[0], Elements.size()); 3254 } 3255 FunctionLabelMap.clear(); 3256 3257 if (!Body) return D; 3258 3259 // Verify that that gotos and switch cases don't jump into scopes illegally. 3260 if (CurFunctionNeedsScopeChecking) 3261 DiagnoseInvalidJumps(Body); 3262 3263 // C++ constructors that have function-try-blocks can't have return statements 3264 // in the handlers of that block. (C++ [except.handle]p14) Verify this. 3265 if (isa<CXXConstructorDecl>(dcl) && isa<CXXTryStmt>(Body)) 3266 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); 3267 3268 return D; 3269} 3270 3271/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 3272/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 3273NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 3274 IdentifierInfo &II, Scope *S) { 3275 // Before we produce a declaration for an implicitly defined 3276 // function, see whether there was a locally-scoped declaration of 3277 // this name as a function or variable. If so, use that 3278 // (non-visible) declaration, and complain about it. 3279 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3280 = LocallyScopedExternalDecls.find(&II); 3281 if (Pos != LocallyScopedExternalDecls.end()) { 3282 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 3283 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 3284 return Pos->second; 3285 } 3286 3287 // Extension in C99. Legal in C90, but warn about it. 3288 if (getLangOptions().C99) 3289 Diag(Loc, diag::ext_implicit_function_decl) << &II; 3290 else 3291 Diag(Loc, diag::warn_implicit_function_decl) << &II; 3292 3293 // FIXME: handle stuff like: 3294 // void foo() { extern float X(); } 3295 // void bar() { X(); } <-- implicit decl for X in another scope. 3296 3297 // Set a Declarator for the implicit definition: int foo(); 3298 const char *Dummy; 3299 DeclSpec DS; 3300 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy); 3301 Error = Error; // Silence warning. 3302 assert(!Error && "Error setting up implicit decl!"); 3303 Declarator D(DS, Declarator::BlockContext); 3304 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0, 3305 0, 0, false, SourceLocation(), 3306 false, 0,0,0, Loc, D), 3307 SourceLocation()); 3308 D.SetIdentifier(&II, Loc); 3309 3310 // Insert this function into translation-unit scope. 3311 3312 DeclContext *PrevDC = CurContext; 3313 CurContext = Context.getTranslationUnitDecl(); 3314 3315 FunctionDecl *FD = 3316 dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D).getAs<Decl>()); 3317 FD->setImplicit(); 3318 3319 CurContext = PrevDC; 3320 3321 AddKnownFunctionAttributes(FD); 3322 3323 return FD; 3324} 3325 3326/// \brief Adds any function attributes that we know a priori based on 3327/// the declaration of this function. 3328/// 3329/// These attributes can apply both to implicitly-declared builtins 3330/// (like __builtin___printf_chk) or to library-declared functions 3331/// like NSLog or printf. 3332void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 3333 if (FD->isInvalidDecl()) 3334 return; 3335 3336 // If this is a built-in function, map its builtin attributes to 3337 // actual attributes. 3338 if (unsigned BuiltinID = FD->getBuiltinID(Context)) { 3339 // Handle printf-formatting attributes. 3340 unsigned FormatIdx; 3341 bool HasVAListArg; 3342 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 3343 if (!FD->getAttr<FormatAttr>()) 3344 FD->addAttr(::new (Context) FormatAttr("printf", FormatIdx + 1, 3345 HasVAListArg ? 0 : FormatIdx + 2)); 3346 } 3347 3348 // Mark const if we don't care about errno and that is the only 3349 // thing preventing the function from being const. This allows 3350 // IRgen to use LLVM intrinsics for such functions. 3351 if (!getLangOptions().MathErrno && 3352 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 3353 if (!FD->getAttr<ConstAttr>()) 3354 FD->addAttr(::new (Context) ConstAttr()); 3355 } 3356 } 3357 3358 IdentifierInfo *Name = FD->getIdentifier(); 3359 if (!Name) 3360 return; 3361 if ((!getLangOptions().CPlusPlus && 3362 FD->getDeclContext()->isTranslationUnit()) || 3363 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 3364 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 3365 LinkageSpecDecl::lang_c)) { 3366 // Okay: this could be a libc/libm/Objective-C function we know 3367 // about. 3368 } else 3369 return; 3370 3371 if (Name->isStr("NSLog") || Name->isStr("NSLogv")) { 3372 if (const FormatAttr *Format = FD->getAttr<FormatAttr>()) { 3373 // FIXME: We known better than our headers. 3374 const_cast<FormatAttr *>(Format)->setType("printf"); 3375 } else 3376 FD->addAttr(::new (Context) FormatAttr("printf", 1, 3377 Name->isStr("NSLogv") ? 0 : 2)); 3378 } else if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { 3379 if (!FD->getAttr<FormatAttr>()) 3380 FD->addAttr(::new (Context) FormatAttr("printf", 2, 3381 Name->isStr("vasprintf") ? 0 : 3)); 3382 } 3383} 3384 3385TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T) { 3386 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 3387 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 3388 3389 // Scope manipulation handled by caller. 3390 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 3391 D.getIdentifierLoc(), 3392 D.getIdentifier(), 3393 T); 3394 3395 if (TagType *TT = dyn_cast<TagType>(T)) { 3396 TagDecl *TD = TT->getDecl(); 3397 3398 // If the TagDecl that the TypedefDecl points to is an anonymous decl 3399 // keep track of the TypedefDecl. 3400 if (!TD->getIdentifier() && !TD->getTypedefForAnonDecl()) 3401 TD->setTypedefForAnonDecl(NewTD); 3402 } 3403 3404 if (D.isInvalidType()) 3405 NewTD->setInvalidDecl(); 3406 return NewTD; 3407} 3408 3409 3410/// \brief Determine whether a tag with a given kind is acceptable 3411/// as a redeclaration of the given tag declaration. 3412/// 3413/// \returns true if the new tag kind is acceptable, false otherwise. 3414bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, 3415 TagDecl::TagKind NewTag, 3416 SourceLocation NewTagLoc, 3417 const IdentifierInfo &Name) { 3418 // C++ [dcl.type.elab]p3: 3419 // The class-key or enum keyword present in the 3420 // elaborated-type-specifier shall agree in kind with the 3421 // declaration to which the name in theelaborated-type-specifier 3422 // refers. This rule also applies to the form of 3423 // elaborated-type-specifier that declares a class-name or 3424 // friend class since it can be construed as referring to the 3425 // definition of the class. Thus, in any 3426 // elaborated-type-specifier, the enum keyword shall be used to 3427 // refer to an enumeration (7.2), the union class-keyshall be 3428 // used to refer to a union (clause 9), and either the class or 3429 // struct class-key shall be used to refer to a class (clause 9) 3430 // declared using the class or struct class-key. 3431 TagDecl::TagKind OldTag = Previous->getTagKind(); 3432 if (OldTag == NewTag) 3433 return true; 3434 3435 if ((OldTag == TagDecl::TK_struct || OldTag == TagDecl::TK_class) && 3436 (NewTag == TagDecl::TK_struct || NewTag == TagDecl::TK_class)) { 3437 // Warn about the struct/class tag mismatch. 3438 bool isTemplate = false; 3439 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) 3440 isTemplate = Record->getDescribedClassTemplate(); 3441 3442 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 3443 << (NewTag == TagDecl::TK_class) 3444 << isTemplate << &Name 3445 << CodeModificationHint::CreateReplacement(SourceRange(NewTagLoc), 3446 OldTag == TagDecl::TK_class? "class" : "struct"); 3447 Diag(Previous->getLocation(), diag::note_previous_use); 3448 return true; 3449 } 3450 return false; 3451} 3452 3453/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 3454/// former case, Name will be non-null. In the later case, Name will be null. 3455/// TagSpec indicates what kind of tag this is. TK indicates whether this is a 3456/// reference/declaration/definition of a tag. 3457Sema::DeclPtrTy Sema::ActOnTag(Scope *S, unsigned TagSpec, TagKind TK, 3458 SourceLocation KWLoc, const CXXScopeSpec &SS, 3459 IdentifierInfo *Name, SourceLocation NameLoc, 3460 AttributeList *Attr, AccessSpecifier AS, 3461 bool &OwnedDecl) { 3462 // If this is not a definition, it must have a name. 3463 assert((Name != 0 || TK == TK_Definition) && 3464 "Nameless record must be a definition!"); 3465 3466 OwnedDecl = false; 3467 TagDecl::TagKind Kind; 3468 switch (TagSpec) { 3469 default: assert(0 && "Unknown tag type!"); 3470 case DeclSpec::TST_struct: Kind = TagDecl::TK_struct; break; 3471 case DeclSpec::TST_union: Kind = TagDecl::TK_union; break; 3472 case DeclSpec::TST_class: Kind = TagDecl::TK_class; break; 3473 case DeclSpec::TST_enum: Kind = TagDecl::TK_enum; break; 3474 } 3475 3476 DeclContext *SearchDC = CurContext; 3477 DeclContext *DC = CurContext; 3478 NamedDecl *PrevDecl = 0; 3479 3480 bool Invalid = false; 3481 3482 if (Name && SS.isNotEmpty()) { 3483 // We have a nested-name tag ('struct foo::bar'). 3484 3485 // Check for invalid 'foo::'. 3486 if (SS.isInvalid()) { 3487 Name = 0; 3488 goto CreateNewDecl; 3489 } 3490 3491 if (RequireCompleteDeclContext(SS)) 3492 return DeclPtrTy::make((Decl *)0); 3493 3494 DC = computeDeclContext(SS); 3495 SearchDC = DC; 3496 // Look-up name inside 'foo::'. 3497 PrevDecl 3498 = dyn_cast_or_null<TagDecl>( 3499 LookupQualifiedName(DC, Name, LookupTagName, true).getAsDecl()); 3500 3501 // A tag 'foo::bar' must already exist. 3502 if (PrevDecl == 0) { 3503 Diag(NameLoc, diag::err_not_tag_in_scope) << Name << SS.getRange(); 3504 Name = 0; 3505 Invalid = true; 3506 goto CreateNewDecl; 3507 } 3508 } else if (Name) { 3509 // If this is a named struct, check to see if there was a previous forward 3510 // declaration or definition. 3511 // FIXME: We're looking into outer scopes here, even when we 3512 // shouldn't be. Doing so can result in ambiguities that we 3513 // shouldn't be diagnosing. 3514 LookupResult R = LookupName(S, Name, LookupTagName, 3515 /*RedeclarationOnly=*/(TK != TK_Reference)); 3516 if (R.isAmbiguous()) { 3517 DiagnoseAmbiguousLookup(R, Name, NameLoc); 3518 // FIXME: This is not best way to recover from case like: 3519 // 3520 // struct S s; 3521 // 3522 // causes needless "incomplete type" error later. 3523 Name = 0; 3524 PrevDecl = 0; 3525 Invalid = true; 3526 } 3527 else 3528 PrevDecl = R; 3529 3530 if (!getLangOptions().CPlusPlus && TK != TK_Reference) { 3531 // FIXME: This makes sure that we ignore the contexts associated 3532 // with C structs, unions, and enums when looking for a matching 3533 // tag declaration or definition. See the similar lookup tweak 3534 // in Sema::LookupName; is there a better way to deal with this? 3535 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 3536 SearchDC = SearchDC->getParent(); 3537 } 3538 } 3539 3540 if (PrevDecl && PrevDecl->isTemplateParameter()) { 3541 // Maybe we will complain about the shadowed template parameter. 3542 DiagnoseTemplateParameterShadow(NameLoc, PrevDecl); 3543 // Just pretend that we didn't see the previous declaration. 3544 PrevDecl = 0; 3545 } 3546 3547 if (PrevDecl) { 3548 // Check whether the previous declaration is usable. 3549 (void)DiagnoseUseOfDecl(PrevDecl, NameLoc); 3550 3551 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 3552 // If this is a use of a previous tag, or if the tag is already declared 3553 // in the same scope (so that the definition/declaration completes or 3554 // rementions the tag), reuse the decl. 3555 if (TK == TK_Reference || isDeclInScope(PrevDecl, SearchDC, S)) { 3556 // Make sure that this wasn't declared as an enum and now used as a 3557 // struct or something similar. 3558 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, KWLoc, *Name)) { 3559 bool SafeToContinue 3560 = (PrevTagDecl->getTagKind() != TagDecl::TK_enum && 3561 Kind != TagDecl::TK_enum); 3562 if (SafeToContinue) 3563 Diag(KWLoc, diag::err_use_with_wrong_tag) 3564 << Name 3565 << CodeModificationHint::CreateReplacement(SourceRange(KWLoc), 3566 PrevTagDecl->getKindName()); 3567 else 3568 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 3569 Diag(PrevDecl->getLocation(), diag::note_previous_use); 3570 3571 if (SafeToContinue) 3572 Kind = PrevTagDecl->getTagKind(); 3573 else { 3574 // Recover by making this an anonymous redefinition. 3575 Name = 0; 3576 PrevDecl = 0; 3577 Invalid = true; 3578 } 3579 } 3580 3581 if (!Invalid) { 3582 // If this is a use, just return the declaration we found. 3583 3584 // FIXME: In the future, return a variant or some other clue 3585 // for the consumer of this Decl to know it doesn't own it. 3586 // For our current ASTs this shouldn't be a problem, but will 3587 // need to be changed with DeclGroups. 3588 if (TK == TK_Reference) 3589 return DeclPtrTy::make(PrevDecl); 3590 3591 // Diagnose attempts to redefine a tag. 3592 if (TK == TK_Definition) { 3593 if (TagDecl *Def = PrevTagDecl->getDefinition(Context)) { 3594 Diag(NameLoc, diag::err_redefinition) << Name; 3595 Diag(Def->getLocation(), diag::note_previous_definition); 3596 // If this is a redefinition, recover by making this 3597 // struct be anonymous, which will make any later 3598 // references get the previous definition. 3599 Name = 0; 3600 PrevDecl = 0; 3601 Invalid = true; 3602 } else { 3603 // If the type is currently being defined, complain 3604 // about a nested redefinition. 3605 TagType *Tag = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 3606 if (Tag->isBeingDefined()) { 3607 Diag(NameLoc, diag::err_nested_redefinition) << Name; 3608 Diag(PrevTagDecl->getLocation(), 3609 diag::note_previous_definition); 3610 Name = 0; 3611 PrevDecl = 0; 3612 Invalid = true; 3613 } 3614 } 3615 3616 // Okay, this is definition of a previously declared or referenced 3617 // tag PrevDecl. We're going to create a new Decl for it. 3618 } 3619 } 3620 // If we get here we have (another) forward declaration or we 3621 // have a definition. Just create a new decl. 3622 } else { 3623 // If we get here, this is a definition of a new tag type in a nested 3624 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 3625 // new decl/type. We set PrevDecl to NULL so that the entities 3626 // have distinct types. 3627 PrevDecl = 0; 3628 } 3629 // If we get here, we're going to create a new Decl. If PrevDecl 3630 // is non-NULL, it's a definition of the tag declared by 3631 // PrevDecl. If it's NULL, we have a new definition. 3632 } else { 3633 // PrevDecl is a namespace, template, or anything else 3634 // that lives in the IDNS_Tag identifier namespace. 3635 if (isDeclInScope(PrevDecl, SearchDC, S)) { 3636 // The tag name clashes with a namespace name, issue an error and 3637 // recover by making this tag be anonymous. 3638 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 3639 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3640 Name = 0; 3641 PrevDecl = 0; 3642 Invalid = true; 3643 } else { 3644 // The existing declaration isn't relevant to us; we're in a 3645 // new scope, so clear out the previous declaration. 3646 PrevDecl = 0; 3647 } 3648 } 3649 } else if (TK == TK_Reference && SS.isEmpty() && Name && 3650 (Kind != TagDecl::TK_enum || !getLangOptions().CPlusPlus)) { 3651 // C++ [basic.scope.pdecl]p5: 3652 // -- for an elaborated-type-specifier of the form 3653 // 3654 // class-key identifier 3655 // 3656 // if the elaborated-type-specifier is used in the 3657 // decl-specifier-seq or parameter-declaration-clause of a 3658 // function defined in namespace scope, the identifier is 3659 // declared as a class-name in the namespace that contains 3660 // the declaration; otherwise, except as a friend 3661 // declaration, the identifier is declared in the smallest 3662 // non-class, non-function-prototype scope that contains the 3663 // declaration. 3664 // 3665 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 3666 // C structs and unions. 3667 // 3668 // GNU C also supports this behavior as part of its incomplete 3669 // enum types extension, while GNU C++ does not. 3670 // 3671 // Find the context where we'll be declaring the tag. 3672 // FIXME: We would like to maintain the current DeclContext as the 3673 // lexical context, 3674 while (SearchDC->isRecord()) 3675 SearchDC = SearchDC->getParent(); 3676 3677 // Find the scope where we'll be declaring the tag. 3678 while (S->isClassScope() || 3679 (getLangOptions().CPlusPlus && S->isFunctionPrototypeScope()) || 3680 ((S->getFlags() & Scope::DeclScope) == 0) || 3681 (S->getEntity() && 3682 ((DeclContext *)S->getEntity())->isTransparentContext())) 3683 S = S->getParent(); 3684 } 3685 3686CreateNewDecl: 3687 3688 // If there is an identifier, use the location of the identifier as the 3689 // location of the decl, otherwise use the location of the struct/union 3690 // keyword. 3691 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 3692 3693 // Otherwise, create a new declaration. If there is a previous 3694 // declaration of the same entity, the two will be linked via 3695 // PrevDecl. 3696 TagDecl *New; 3697 3698 if (Kind == TagDecl::TK_enum) { 3699 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 3700 // enum X { A, B, C } D; D should chain to X. 3701 New = EnumDecl::Create(Context, SearchDC, Loc, Name, 3702 cast_or_null<EnumDecl>(PrevDecl)); 3703 // If this is an undefined enum, warn. 3704 if (TK != TK_Definition && !Invalid) { 3705 unsigned DK = getLangOptions().CPlusPlus? diag::err_forward_ref_enum 3706 : diag::ext_forward_ref_enum; 3707 Diag(Loc, DK); 3708 } 3709 } else { 3710 // struct/union/class 3711 3712 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 3713 // struct X { int A; } D; D should chain to X. 3714 if (getLangOptions().CPlusPlus) 3715 // FIXME: Look for a way to use RecordDecl for simple structs. 3716 New = CXXRecordDecl::Create(Context, Kind, SearchDC, Loc, Name, 3717 cast_or_null<CXXRecordDecl>(PrevDecl)); 3718 else 3719 New = RecordDecl::Create(Context, Kind, SearchDC, Loc, Name, 3720 cast_or_null<RecordDecl>(PrevDecl)); 3721 } 3722 3723 if (Kind != TagDecl::TK_enum) { 3724 // Handle #pragma pack: if the #pragma pack stack has non-default 3725 // alignment, make up a packed attribute for this decl. These 3726 // attributes are checked when the ASTContext lays out the 3727 // structure. 3728 // 3729 // It is important for implementing the correct semantics that this 3730 // happen here (in act on tag decl). The #pragma pack stack is 3731 // maintained as a result of parser callbacks which can occur at 3732 // many points during the parsing of a struct declaration (because 3733 // the #pragma tokens are effectively skipped over during the 3734 // parsing of the struct). 3735 if (unsigned Alignment = getPragmaPackAlignment()) 3736 New->addAttr(::new (Context) PackedAttr(Alignment * 8)); 3737 } 3738 3739 if (getLangOptions().CPlusPlus && SS.isEmpty() && Name && !Invalid) { 3740 // C++ [dcl.typedef]p3: 3741 // [...] Similarly, in a given scope, a class or enumeration 3742 // shall not be declared with the same name as a typedef-name 3743 // that is declared in that scope and refers to a type other 3744 // than the class or enumeration itself. 3745 LookupResult Lookup = LookupName(S, Name, LookupOrdinaryName, true); 3746 TypedefDecl *PrevTypedef = 0; 3747 if (Lookup.getKind() == LookupResult::Found) 3748 PrevTypedef = dyn_cast<TypedefDecl>(Lookup.getAsDecl()); 3749 3750 if (PrevTypedef && isDeclInScope(PrevTypedef, SearchDC, S) && 3751 Context.getCanonicalType(Context.getTypeDeclType(PrevTypedef)) != 3752 Context.getCanonicalType(Context.getTypeDeclType(New))) { 3753 Diag(Loc, diag::err_tag_definition_of_typedef) 3754 << Context.getTypeDeclType(New) 3755 << PrevTypedef->getUnderlyingType(); 3756 Diag(PrevTypedef->getLocation(), diag::note_previous_definition); 3757 Invalid = true; 3758 } 3759 } 3760 3761 if (Invalid) 3762 New->setInvalidDecl(); 3763 3764 if (Attr) 3765 ProcessDeclAttributeList(S, New, Attr); 3766 3767 // If we're declaring or defining a tag in function prototype scope 3768 // in C, note that this type can only be used within the function. 3769 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 3770 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 3771 3772 // Set the lexical context. If the tag has a C++ scope specifier, the 3773 // lexical context will be different from the semantic context. 3774 New->setLexicalDeclContext(CurContext); 3775 3776 // Set the access specifier. 3777 if (!Invalid) 3778 SetMemberAccessSpecifier(New, PrevDecl, AS); 3779 3780 if (TK == TK_Definition) 3781 New->startDefinition(); 3782 3783 // If this has an identifier, add it to the scope stack. 3784 if (Name) { 3785 S = getNonFieldDeclScope(S); 3786 PushOnScopeChains(New, S); 3787 } else { 3788 CurContext->addDecl(New); 3789 } 3790 3791 // If this is the C FILE type, notify the AST context. 3792 if (IdentifierInfo *II = New->getIdentifier()) 3793 if (!New->isInvalidDecl() && 3794 New->getDeclContext()->getLookupContext()->isTranslationUnit() && 3795 II->isStr("FILE")) 3796 Context.setFILEDecl(New); 3797 3798 OwnedDecl = true; 3799 return DeclPtrTy::make(New); 3800} 3801 3802void Sema::ActOnTagStartDefinition(Scope *S, DeclPtrTy TagD) { 3803 AdjustDeclIfTemplate(TagD); 3804 TagDecl *Tag = cast<TagDecl>(TagD.getAs<Decl>()); 3805 3806 // Enter the tag context. 3807 PushDeclContext(S, Tag); 3808 3809 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Tag)) { 3810 FieldCollector->StartClass(); 3811 3812 if (Record->getIdentifier()) { 3813 // C++ [class]p2: 3814 // [...] The class-name is also inserted into the scope of the 3815 // class itself; this is known as the injected-class-name. For 3816 // purposes of access checking, the injected-class-name is treated 3817 // as if it were a public member name. 3818 CXXRecordDecl *InjectedClassName 3819 = CXXRecordDecl::Create(Context, Record->getTagKind(), 3820 CurContext, Record->getLocation(), 3821 Record->getIdentifier(), Record); 3822 InjectedClassName->setImplicit(); 3823 InjectedClassName->setAccess(AS_public); 3824 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 3825 InjectedClassName->setDescribedClassTemplate(Template); 3826 PushOnScopeChains(InjectedClassName, S); 3827 assert(InjectedClassName->isInjectedClassName() && 3828 "Broken injected-class-name"); 3829 } 3830 } 3831} 3832 3833void Sema::ActOnTagFinishDefinition(Scope *S, DeclPtrTy TagD, 3834 SourceLocation RBraceLoc) { 3835 AdjustDeclIfTemplate(TagD); 3836 TagDecl *Tag = cast<TagDecl>(TagD.getAs<Decl>()); 3837 Tag->setRBraceLoc(RBraceLoc); 3838 3839 if (isa<CXXRecordDecl>(Tag)) 3840 FieldCollector->FinishClass(); 3841 3842 // Exit this scope of this tag's definition. 3843 PopDeclContext(); 3844 3845 // Notify the consumer that we've defined a tag. 3846 Consumer.HandleTagDeclDefinition(Tag); 3847} 3848 3849// Note that FieldName may be null for anonymous bitfields. 3850bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName, 3851 QualType FieldTy, const Expr *BitWidth) { 3852 3853 // C99 6.7.2.1p4 - verify the field type. 3854 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 3855 if (!FieldTy->isDependentType() && !FieldTy->isIntegralType()) { 3856 // Handle incomplete types with specific error. 3857 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 3858 return true; 3859 if (FieldName) 3860 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 3861 << FieldName << FieldTy << BitWidth->getSourceRange(); 3862 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) 3863 << FieldTy << BitWidth->getSourceRange(); 3864 } 3865 3866 // If the bit-width is type- or value-dependent, don't try to check 3867 // it now. 3868 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 3869 return false; 3870 3871 llvm::APSInt Value; 3872 if (VerifyIntegerConstantExpression(BitWidth, &Value)) 3873 return true; 3874 3875 // Zero-width bitfield is ok for anonymous field. 3876 if (Value == 0 && FieldName) 3877 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 3878 3879 if (Value.isSigned() && Value.isNegative()) { 3880 if (FieldName) 3881 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 3882 << FieldName << Value.toString(10); 3883 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) 3884 << Value.toString(10); 3885 } 3886 3887 if (!FieldTy->isDependentType()) { 3888 uint64_t TypeSize = Context.getTypeSize(FieldTy); 3889 if (Value.getZExtValue() > TypeSize) { 3890 if (FieldName) 3891 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 3892 << FieldName << (unsigned)TypeSize; 3893 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) 3894 << (unsigned)TypeSize; 3895 } 3896 } 3897 3898 return false; 3899} 3900 3901/// ActOnField - Each field of a struct/union/class is passed into this in order 3902/// to create a FieldDecl object for it. 3903Sema::DeclPtrTy Sema::ActOnField(Scope *S, DeclPtrTy TagD, 3904 SourceLocation DeclStart, 3905 Declarator &D, ExprTy *BitfieldWidth) { 3906 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD.getAs<Decl>()), 3907 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 3908 AS_public); 3909 return DeclPtrTy::make(Res); 3910} 3911 3912/// HandleField - Analyze a field of a C struct or a C++ data member. 3913/// 3914FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 3915 SourceLocation DeclStart, 3916 Declarator &D, Expr *BitWidth, 3917 AccessSpecifier AS) { 3918 IdentifierInfo *II = D.getIdentifier(); 3919 SourceLocation Loc = DeclStart; 3920 if (II) Loc = D.getIdentifierLoc(); 3921 3922 QualType T = GetTypeForDeclarator(D, S); 3923 if (getLangOptions().CPlusPlus) 3924 CheckExtraCXXDefaultArguments(D); 3925 3926 DiagnoseFunctionSpecifiers(D); 3927 3928 if (D.getDeclSpec().isThreadSpecified()) 3929 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 3930 3931 NamedDecl *PrevDecl = LookupName(S, II, LookupMemberName, true); 3932 3933 if (PrevDecl && PrevDecl->isTemplateParameter()) { 3934 // Maybe we will complain about the shadowed template parameter. 3935 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 3936 // Just pretend that we didn't see the previous declaration. 3937 PrevDecl = 0; 3938 } 3939 3940 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 3941 PrevDecl = 0; 3942 3943 FieldDecl *NewFD 3944 = CheckFieldDecl(II, T, Record, Loc, 3945 D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable, 3946 BitWidth, AS, PrevDecl, &D); 3947 if (NewFD->isInvalidDecl() && PrevDecl) { 3948 // Don't introduce NewFD into scope; there's already something 3949 // with the same name in the same scope. 3950 } else if (II) { 3951 PushOnScopeChains(NewFD, S); 3952 } else 3953 Record->addDecl(NewFD); 3954 3955 return NewFD; 3956} 3957 3958/// \brief Build a new FieldDecl and check its well-formedness. 3959/// 3960/// This routine builds a new FieldDecl given the fields name, type, 3961/// record, etc. \p PrevDecl should refer to any previous declaration 3962/// with the same name and in the same scope as the field to be 3963/// created. 3964/// 3965/// \returns a new FieldDecl. 3966/// 3967/// \todo The Declarator argument is a hack. It will be removed once 3968FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 3969 RecordDecl *Record, SourceLocation Loc, 3970 bool Mutable, Expr *BitWidth, 3971 AccessSpecifier AS, NamedDecl *PrevDecl, 3972 Declarator *D) { 3973 IdentifierInfo *II = Name.getAsIdentifierInfo(); 3974 bool InvalidDecl = false; 3975 if (D) InvalidDecl = D->isInvalidType(); 3976 3977 // If we receive a broken type, recover by assuming 'int' and 3978 // marking this declaration as invalid. 3979 if (T.isNull()) { 3980 InvalidDecl = true; 3981 T = Context.IntTy; 3982 } 3983 3984 // C99 6.7.2.1p8: A member of a structure or union may have any type other 3985 // than a variably modified type. 3986 if (T->isVariablyModifiedType()) { 3987 bool SizeIsNegative; 3988 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 3989 SizeIsNegative); 3990 if (!FixedTy.isNull()) { 3991 Diag(Loc, diag::warn_illegal_constant_array_size); 3992 T = FixedTy; 3993 } else { 3994 if (SizeIsNegative) 3995 Diag(Loc, diag::err_typecheck_negative_array_size); 3996 else 3997 Diag(Loc, diag::err_typecheck_field_variable_size); 3998 T = Context.IntTy; 3999 InvalidDecl = true; 4000 } 4001 } 4002 4003 // Fields can not have abstract class types 4004 if (RequireNonAbstractType(Loc, T, diag::err_abstract_type_in_decl, 4005 AbstractFieldType)) 4006 InvalidDecl = true; 4007 4008 // If this is declared as a bit-field, check the bit-field. 4009 if (BitWidth && VerifyBitField(Loc, II, T, BitWidth)) { 4010 InvalidDecl = true; 4011 DeleteExpr(BitWidth); 4012 BitWidth = 0; 4013 } 4014 4015 FieldDecl *NewFD = FieldDecl::Create(Context, Record, Loc, II, T, BitWidth, 4016 Mutable); 4017 if (InvalidDecl) 4018 NewFD->setInvalidDecl(); 4019 4020 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 4021 Diag(Loc, diag::err_duplicate_member) << II; 4022 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 4023 NewFD->setInvalidDecl(); 4024 } 4025 4026 if (getLangOptions().CPlusPlus && !T->isPODType()) 4027 cast<CXXRecordDecl>(Record)->setPOD(false); 4028 4029 // FIXME: We need to pass in the attributes given an AST 4030 // representation, not a parser representation. 4031 if (D) 4032 // FIXME: What to pass instead of TUScope? 4033 ProcessDeclAttributes(TUScope, NewFD, *D); 4034 4035 if (T.isObjCGCWeak()) 4036 Diag(Loc, diag::warn_attribute_weak_on_field); 4037 4038 NewFD->setAccess(AS); 4039 4040 // C++ [dcl.init.aggr]p1: 4041 // An aggregate is an array or a class (clause 9) with [...] no 4042 // private or protected non-static data members (clause 11). 4043 // A POD must be an aggregate. 4044 if (getLangOptions().CPlusPlus && 4045 (AS == AS_private || AS == AS_protected)) { 4046 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record); 4047 CXXRecord->setAggregate(false); 4048 CXXRecord->setPOD(false); 4049 } 4050 4051 return NewFD; 4052} 4053 4054/// TranslateIvarVisibility - Translate visibility from a token ID to an 4055/// AST enum value. 4056static ObjCIvarDecl::AccessControl 4057TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 4058 switch (ivarVisibility) { 4059 default: assert(0 && "Unknown visitibility kind"); 4060 case tok::objc_private: return ObjCIvarDecl::Private; 4061 case tok::objc_public: return ObjCIvarDecl::Public; 4062 case tok::objc_protected: return ObjCIvarDecl::Protected; 4063 case tok::objc_package: return ObjCIvarDecl::Package; 4064 } 4065} 4066 4067/// ActOnIvar - Each ivar field of an objective-c class is passed into this 4068/// in order to create an IvarDecl object for it. 4069Sema::DeclPtrTy Sema::ActOnIvar(Scope *S, 4070 SourceLocation DeclStart, 4071 DeclPtrTy IntfDecl, 4072 Declarator &D, ExprTy *BitfieldWidth, 4073 tok::ObjCKeywordKind Visibility) { 4074 4075 IdentifierInfo *II = D.getIdentifier(); 4076 Expr *BitWidth = (Expr*)BitfieldWidth; 4077 SourceLocation Loc = DeclStart; 4078 if (II) Loc = D.getIdentifierLoc(); 4079 4080 // FIXME: Unnamed fields can be handled in various different ways, for 4081 // example, unnamed unions inject all members into the struct namespace! 4082 4083 QualType T = GetTypeForDeclarator(D, S); 4084 4085 if (BitWidth) { 4086 // 6.7.2.1p3, 6.7.2.1p4 4087 if (VerifyBitField(Loc, II, T, BitWidth)) { 4088 D.setInvalidType(); 4089 DeleteExpr(BitWidth); 4090 BitWidth = 0; 4091 } 4092 } else { 4093 // Not a bitfield. 4094 4095 // validate II. 4096 4097 } 4098 4099 // C99 6.7.2.1p8: A member of a structure or union may have any type other 4100 // than a variably modified type. 4101 if (T->isVariablyModifiedType()) { 4102 Diag(Loc, diag::err_typecheck_ivar_variable_size); 4103 D.setInvalidType(); 4104 } 4105 4106 // Get the visibility (access control) for this ivar. 4107 ObjCIvarDecl::AccessControl ac = 4108 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 4109 : ObjCIvarDecl::None; 4110 // Must set ivar's DeclContext to its enclosing interface. 4111 Decl *EnclosingDecl = IntfDecl.getAs<Decl>(); 4112 DeclContext *EnclosingContext; 4113 if (ObjCImplementationDecl *IMPDecl = 4114 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 4115 // Case of ivar declared in an implementation. Context is that of its class. 4116 ObjCInterfaceDecl* IDecl = IMPDecl->getClassInterface(); 4117 assert(IDecl && "No class- ActOnIvar"); 4118 EnclosingContext = cast_or_null<DeclContext>(IDecl); 4119 } 4120 else 4121 EnclosingContext = dyn_cast<DeclContext>(EnclosingDecl); 4122 assert(EnclosingContext && "null DeclContext for ivar - ActOnIvar"); 4123 4124 // Construct the decl. 4125 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, 4126 EnclosingContext, Loc, II, T,ac, 4127 (Expr *)BitfieldWidth); 4128 4129 if (II) { 4130 NamedDecl *PrevDecl = LookupName(S, II, LookupMemberName, true); 4131 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S) 4132 && !isa<TagDecl>(PrevDecl)) { 4133 Diag(Loc, diag::err_duplicate_member) << II; 4134 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 4135 NewID->setInvalidDecl(); 4136 } 4137 } 4138 4139 // Process attributes attached to the ivar. 4140 ProcessDeclAttributes(S, NewID, D); 4141 4142 if (D.isInvalidType()) 4143 NewID->setInvalidDecl(); 4144 4145 if (II) { 4146 // FIXME: When interfaces are DeclContexts, we'll need to add 4147 // these to the interface. 4148 S->AddDecl(DeclPtrTy::make(NewID)); 4149 IdResolver.AddDecl(NewID); 4150 } 4151 4152 return DeclPtrTy::make(NewID); 4153} 4154 4155void Sema::ActOnFields(Scope* S, 4156 SourceLocation RecLoc, DeclPtrTy RecDecl, 4157 DeclPtrTy *Fields, unsigned NumFields, 4158 SourceLocation LBrac, SourceLocation RBrac, 4159 AttributeList *Attr) { 4160 Decl *EnclosingDecl = RecDecl.getAs<Decl>(); 4161 assert(EnclosingDecl && "missing record or interface decl"); 4162 4163 // If the decl this is being inserted into is invalid, then it may be a 4164 // redeclaration or some other bogus case. Don't try to add fields to it. 4165 if (EnclosingDecl->isInvalidDecl()) { 4166 // FIXME: Deallocate fields? 4167 return; 4168 } 4169 4170 4171 // Verify that all the fields are okay. 4172 unsigned NumNamedMembers = 0; 4173 llvm::SmallVector<FieldDecl*, 32> RecFields; 4174 4175 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 4176 for (unsigned i = 0; i != NumFields; ++i) { 4177 FieldDecl *FD = cast<FieldDecl>(Fields[i].getAs<Decl>()); 4178 4179 // Get the type for the field. 4180 Type *FDTy = FD->getType().getTypePtr(); 4181 4182 if (!FD->isAnonymousStructOrUnion()) { 4183 // Remember all fields written by the user. 4184 RecFields.push_back(FD); 4185 } 4186 4187 // If the field is already invalid for some reason, don't emit more 4188 // diagnostics about it. 4189 if (FD->isInvalidDecl()) 4190 continue; 4191 4192 // C99 6.7.2.1p2: 4193 // A structure or union shall not contain a member with 4194 // incomplete or function type (hence, a structure shall not 4195 // contain an instance of itself, but may contain a pointer to 4196 // an instance of itself), except that the last member of a 4197 // structure with more than one named member may have incomplete 4198 // array type; such a structure (and any union containing, 4199 // possibly recursively, a member that is such a structure) 4200 // shall not be a member of a structure or an element of an 4201 // array. 4202 if (FDTy->isFunctionType()) { 4203 // Field declared as a function. 4204 Diag(FD->getLocation(), diag::err_field_declared_as_function) 4205 << FD->getDeclName(); 4206 FD->setInvalidDecl(); 4207 EnclosingDecl->setInvalidDecl(); 4208 continue; 4209 } else if (FDTy->isIncompleteArrayType() && i == NumFields - 1 && 4210 Record && Record->isStruct()) { 4211 // Flexible array member. 4212 if (NumNamedMembers < 1) { 4213 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 4214 << FD->getDeclName(); 4215 FD->setInvalidDecl(); 4216 EnclosingDecl->setInvalidDecl(); 4217 continue; 4218 } 4219 // Okay, we have a legal flexible array member at the end of the struct. 4220 if (Record) 4221 Record->setHasFlexibleArrayMember(true); 4222 } else if (!FDTy->isDependentType() && 4223 RequireCompleteType(FD->getLocation(), FD->getType(), 4224 diag::err_field_incomplete)) { 4225 // Incomplete type 4226 FD->setInvalidDecl(); 4227 EnclosingDecl->setInvalidDecl(); 4228 continue; 4229 } else if (const RecordType *FDTTy = FDTy->getAsRecordType()) { 4230 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 4231 // If this is a member of a union, then entire union becomes "flexible". 4232 if (Record && Record->isUnion()) { 4233 Record->setHasFlexibleArrayMember(true); 4234 } else { 4235 // If this is a struct/class and this is not the last element, reject 4236 // it. Note that GCC supports variable sized arrays in the middle of 4237 // structures. 4238 if (i != NumFields-1) 4239 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 4240 << FD->getDeclName() << FD->getType(); 4241 else { 4242 // We support flexible arrays at the end of structs in 4243 // other structs as an extension. 4244 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 4245 << FD->getDeclName(); 4246 if (Record) 4247 Record->setHasFlexibleArrayMember(true); 4248 } 4249 } 4250 } 4251 if (Record && FDTTy->getDecl()->hasObjectMember()) 4252 Record->setHasObjectMember(true); 4253 } else if (FDTy->isObjCInterfaceType()) { 4254 /// A field cannot be an Objective-c object 4255 Diag(FD->getLocation(), diag::err_statically_allocated_object); 4256 FD->setInvalidDecl(); 4257 EnclosingDecl->setInvalidDecl(); 4258 continue; 4259 } 4260 else if (getLangOptions().ObjC1 && 4261 getLangOptions().getGCMode() != LangOptions::NonGC && 4262 Record && 4263 (Context.isObjCObjectPointerType(FD->getType()) || 4264 FD->getType().isObjCGCStrong())) 4265 Record->setHasObjectMember(true); 4266 // Keep track of the number of named members. 4267 if (FD->getIdentifier()) 4268 ++NumNamedMembers; 4269 } 4270 4271 // Okay, we successfully defined 'Record'. 4272 if (Record) { 4273 Record->completeDefinition(Context); 4274 } else { 4275 ObjCIvarDecl **ClsFields = 4276 reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); 4277 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 4278 ID->setIVarList(ClsFields, RecFields.size(), Context); 4279 ID->setLocEnd(RBrac); 4280 // Add ivar's to class's DeclContext. 4281 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 4282 ClsFields[i]->setLexicalDeclContext(ID); 4283 ID->addDecl(ClsFields[i]); 4284 } 4285 // Must enforce the rule that ivars in the base classes may not be 4286 // duplicates. 4287 if (ID->getSuperClass()) { 4288 for (ObjCInterfaceDecl::ivar_iterator IVI = ID->ivar_begin(), 4289 IVE = ID->ivar_end(); IVI != IVE; ++IVI) { 4290 ObjCIvarDecl* Ivar = (*IVI); 4291 4292 if (IdentifierInfo *II = Ivar->getIdentifier()) { 4293 ObjCIvarDecl* prevIvar = 4294 ID->getSuperClass()->lookupInstanceVariable(II); 4295 if (prevIvar) { 4296 Diag(Ivar->getLocation(), diag::err_duplicate_member) << II; 4297 Diag(prevIvar->getLocation(), diag::note_previous_declaration); 4298 } 4299 } 4300 } 4301 } 4302 } else if (ObjCImplementationDecl *IMPDecl = 4303 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 4304 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 4305 for (unsigned I = 0, N = RecFields.size(); I != N; ++I) 4306 // Ivar declared in @implementation never belongs to the implementation. 4307 // Only it is in implementation's lexical context. 4308 ClsFields[I]->setLexicalDeclContext(IMPDecl); 4309 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 4310 } 4311 } 4312 4313 if (Attr) 4314 ProcessDeclAttributeList(S, Record, Attr); 4315} 4316 4317EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 4318 EnumConstantDecl *LastEnumConst, 4319 SourceLocation IdLoc, 4320 IdentifierInfo *Id, 4321 ExprArg val) { 4322 Expr *Val = (Expr *)val.get(); 4323 4324 llvm::APSInt EnumVal(32); 4325 QualType EltTy; 4326 if (Val && !Val->isTypeDependent()) { 4327 // Make sure to promote the operand type to int. 4328 UsualUnaryConversions(Val); 4329 if (Val != val.get()) { 4330 val.release(); 4331 val = Val; 4332 } 4333 4334 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 4335 SourceLocation ExpLoc; 4336 if (!Val->isValueDependent() && 4337 VerifyIntegerConstantExpression(Val, &EnumVal)) { 4338 Val = 0; 4339 } else { 4340 EltTy = Val->getType(); 4341 } 4342 } 4343 4344 if (!Val) { 4345 if (LastEnumConst) { 4346 // Assign the last value + 1. 4347 EnumVal = LastEnumConst->getInitVal(); 4348 ++EnumVal; 4349 4350 // Check for overflow on increment. 4351 if (EnumVal < LastEnumConst->getInitVal()) 4352 Diag(IdLoc, diag::warn_enum_value_overflow); 4353 4354 EltTy = LastEnumConst->getType(); 4355 } else { 4356 // First value, set to zero. 4357 EltTy = Context.IntTy; 4358 EnumVal.zextOrTrunc(static_cast<uint32_t>(Context.getTypeSize(EltTy))); 4359 } 4360 } 4361 4362 val.release(); 4363 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 4364 Val, EnumVal); 4365} 4366 4367 4368Sema::DeclPtrTy Sema::ActOnEnumConstant(Scope *S, DeclPtrTy theEnumDecl, 4369 DeclPtrTy lastEnumConst, 4370 SourceLocation IdLoc, 4371 IdentifierInfo *Id, 4372 SourceLocation EqualLoc, ExprTy *val) { 4373 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl.getAs<Decl>()); 4374 EnumConstantDecl *LastEnumConst = 4375 cast_or_null<EnumConstantDecl>(lastEnumConst.getAs<Decl>()); 4376 Expr *Val = static_cast<Expr*>(val); 4377 4378 // The scope passed in may not be a decl scope. Zip up the scope tree until 4379 // we find one that is. 4380 S = getNonFieldDeclScope(S); 4381 4382 // Verify that there isn't already something declared with this name in this 4383 // scope. 4384 NamedDecl *PrevDecl = LookupName(S, Id, LookupOrdinaryName); 4385 if (PrevDecl && PrevDecl->isTemplateParameter()) { 4386 // Maybe we will complain about the shadowed template parameter. 4387 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 4388 // Just pretend that we didn't see the previous declaration. 4389 PrevDecl = 0; 4390 } 4391 4392 if (PrevDecl) { 4393 // When in C++, we may get a TagDecl with the same name; in this case the 4394 // enum constant will 'hide' the tag. 4395 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 4396 "Received TagDecl when not in C++!"); 4397 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 4398 if (isa<EnumConstantDecl>(PrevDecl)) 4399 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 4400 else 4401 Diag(IdLoc, diag::err_redefinition) << Id; 4402 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4403 if (Val) Val->Destroy(Context); 4404 return DeclPtrTy(); 4405 } 4406 } 4407 4408 EnumConstantDecl *New = CheckEnumConstant(TheEnumDecl, LastEnumConst, 4409 IdLoc, Id, Owned(Val)); 4410 4411 // Register this decl in the current scope stack. 4412 if (New) 4413 PushOnScopeChains(New, S); 4414 4415 return DeclPtrTy::make(New); 4416} 4417 4418void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc, 4419 SourceLocation RBraceLoc, DeclPtrTy EnumDeclX, 4420 DeclPtrTy *Elements, unsigned NumElements) { 4421 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX.getAs<Decl>()); 4422 QualType EnumType = Context.getTypeDeclType(Enum); 4423 4424 // TODO: If the result value doesn't fit in an int, it must be a long or long 4425 // long value. ISO C does not support this, but GCC does as an extension, 4426 // emit a warning. 4427 unsigned IntWidth = Context.Target.getIntWidth(); 4428 4429 // Verify that all the values are okay, compute the size of the values, and 4430 // reverse the list. 4431 unsigned NumNegativeBits = 0; 4432 unsigned NumPositiveBits = 0; 4433 4434 // Keep track of whether all elements have type int. 4435 bool AllElementsInt = true; 4436 4437 for (unsigned i = 0; i != NumElements; ++i) { 4438 EnumConstantDecl *ECD = 4439 cast_or_null<EnumConstantDecl>(Elements[i].getAs<Decl>()); 4440 if (!ECD) continue; // Already issued a diagnostic. 4441 4442 // If the enum value doesn't fit in an int, emit an extension warning. 4443 const llvm::APSInt &InitVal = ECD->getInitVal(); 4444 assert(InitVal.getBitWidth() >= IntWidth && 4445 "Should have promoted value to int"); 4446 if (InitVal.getBitWidth() > IntWidth) { 4447 llvm::APSInt V(InitVal); 4448 V.trunc(IntWidth); 4449 V.extend(InitVal.getBitWidth()); 4450 if (V != InitVal) 4451 Diag(ECD->getLocation(), diag::ext_enum_value_not_int) 4452 << InitVal.toString(10); 4453 } 4454 4455 // Keep track of the size of positive and negative values. 4456 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 4457 NumPositiveBits = std::max(NumPositiveBits, 4458 (unsigned)InitVal.getActiveBits()); 4459 else 4460 NumNegativeBits = std::max(NumNegativeBits, 4461 (unsigned)InitVal.getMinSignedBits()); 4462 4463 // Keep track of whether every enum element has type int (very commmon). 4464 if (AllElementsInt) 4465 AllElementsInt = ECD->getType() == Context.IntTy; 4466 } 4467 4468 // Figure out the type that should be used for this enum. 4469 // FIXME: Support attribute(packed) on enums and -fshort-enums. 4470 QualType BestType; 4471 unsigned BestWidth; 4472 4473 if (NumNegativeBits) { 4474 // If there is a negative value, figure out the smallest integer type (of 4475 // int/long/longlong) that fits. 4476 if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 4477 BestType = Context.IntTy; 4478 BestWidth = IntWidth; 4479 } else { 4480 BestWidth = Context.Target.getLongWidth(); 4481 4482 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) 4483 BestType = Context.LongTy; 4484 else { 4485 BestWidth = Context.Target.getLongLongWidth(); 4486 4487 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 4488 Diag(Enum->getLocation(), diag::warn_enum_too_large); 4489 BestType = Context.LongLongTy; 4490 } 4491 } 4492 } else { 4493 // If there is no negative value, figure out which of uint, ulong, ulonglong 4494 // fits. 4495 if (NumPositiveBits <= IntWidth) { 4496 BestType = Context.UnsignedIntTy; 4497 BestWidth = IntWidth; 4498 } else if (NumPositiveBits <= 4499 (BestWidth = Context.Target.getLongWidth())) { 4500 BestType = Context.UnsignedLongTy; 4501 } else { 4502 BestWidth = Context.Target.getLongLongWidth(); 4503 assert(NumPositiveBits <= BestWidth && 4504 "How could an initializer get larger than ULL?"); 4505 BestType = Context.UnsignedLongLongTy; 4506 } 4507 } 4508 4509 // Loop over all of the enumerator constants, changing their types to match 4510 // the type of the enum if needed. 4511 for (unsigned i = 0; i != NumElements; ++i) { 4512 EnumConstantDecl *ECD = 4513 cast_or_null<EnumConstantDecl>(Elements[i].getAs<Decl>()); 4514 if (!ECD) continue; // Already issued a diagnostic. 4515 4516 // Standard C says the enumerators have int type, but we allow, as an 4517 // extension, the enumerators to be larger than int size. If each 4518 // enumerator value fits in an int, type it as an int, otherwise type it the 4519 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 4520 // that X has type 'int', not 'unsigned'. 4521 if (ECD->getType() == Context.IntTy) { 4522 // Make sure the init value is signed. 4523 llvm::APSInt IV = ECD->getInitVal(); 4524 IV.setIsSigned(true); 4525 ECD->setInitVal(IV); 4526 4527 if (getLangOptions().CPlusPlus) 4528 // C++ [dcl.enum]p4: Following the closing brace of an 4529 // enum-specifier, each enumerator has the type of its 4530 // enumeration. 4531 ECD->setType(EnumType); 4532 continue; // Already int type. 4533 } 4534 4535 // Determine whether the value fits into an int. 4536 llvm::APSInt InitVal = ECD->getInitVal(); 4537 bool FitsInInt; 4538 if (InitVal.isUnsigned() || !InitVal.isNegative()) 4539 FitsInInt = InitVal.getActiveBits() < IntWidth; 4540 else 4541 FitsInInt = InitVal.getMinSignedBits() <= IntWidth; 4542 4543 // If it fits into an integer type, force it. Otherwise force it to match 4544 // the enum decl type. 4545 QualType NewTy; 4546 unsigned NewWidth; 4547 bool NewSign; 4548 if (FitsInInt) { 4549 NewTy = Context.IntTy; 4550 NewWidth = IntWidth; 4551 NewSign = true; 4552 } else if (ECD->getType() == BestType) { 4553 // Already the right type! 4554 if (getLangOptions().CPlusPlus) 4555 // C++ [dcl.enum]p4: Following the closing brace of an 4556 // enum-specifier, each enumerator has the type of its 4557 // enumeration. 4558 ECD->setType(EnumType); 4559 continue; 4560 } else { 4561 NewTy = BestType; 4562 NewWidth = BestWidth; 4563 NewSign = BestType->isSignedIntegerType(); 4564 } 4565 4566 // Adjust the APSInt value. 4567 InitVal.extOrTrunc(NewWidth); 4568 InitVal.setIsSigned(NewSign); 4569 ECD->setInitVal(InitVal); 4570 4571 // Adjust the Expr initializer and type. 4572 if (ECD->getInitExpr()) 4573 ECD->setInitExpr(new (Context) ImplicitCastExpr(NewTy, ECD->getInitExpr(), 4574 /*isLvalue=*/false)); 4575 if (getLangOptions().CPlusPlus) 4576 // C++ [dcl.enum]p4: Following the closing brace of an 4577 // enum-specifier, each enumerator has the type of its 4578 // enumeration. 4579 ECD->setType(EnumType); 4580 else 4581 ECD->setType(NewTy); 4582 } 4583 4584 Enum->completeDefinition(Context, BestType); 4585} 4586 4587Sema::DeclPtrTy Sema::ActOnFileScopeAsmDecl(SourceLocation Loc, 4588 ExprArg expr) { 4589 StringLiteral *AsmString = cast<StringLiteral>(expr.takeAs<Expr>()); 4590 4591 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext, 4592 Loc, AsmString); 4593 CurContext->addDecl(New); 4594 return DeclPtrTy::make(New); 4595} 4596 4597void Sema::ActOnPragmaWeakID(IdentifierInfo* Name, 4598 SourceLocation PragmaLoc, 4599 SourceLocation NameLoc) { 4600 Decl *PrevDecl = LookupName(TUScope, Name, LookupOrdinaryName); 4601 4602 // FIXME: This implementation is an ugly hack! 4603 if (PrevDecl) { 4604 PrevDecl->addAttr(::new (Context) WeakAttr()); 4605 return; 4606 } 4607 Diag(PragmaLoc, diag::err_unsupported_pragma_weak); 4608 return; 4609} 4610 4611void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name, 4612 IdentifierInfo* AliasName, 4613 SourceLocation PragmaLoc, 4614 SourceLocation NameLoc, 4615 SourceLocation AliasNameLoc) { 4616 Decl *PrevDecl = LookupName(TUScope, Name, LookupOrdinaryName); 4617 4618 // FIXME: This implementation is an ugly hack! 4619 if (PrevDecl) { 4620 PrevDecl->addAttr(::new (Context) AliasAttr(AliasName->getName())); 4621 PrevDecl->addAttr(::new (Context) WeakAttr()); 4622 return; 4623 } 4624 Diag(PragmaLoc, diag::err_unsupported_pragma_weak); 4625 return; 4626} 4627