SemaDecl.cpp revision f59a56e180bf54528d7d1d5afa68fcc13300965a
1//===--- SemaDecl.cpp - Semantic Analysis for Declarations ----------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "Sema.h" 15#include "SemaInherit.h" 16#include "clang/AST/APValue.h" 17#include "clang/AST/ASTConsumer.h" 18#include "clang/AST/ASTContext.h" 19#include "clang/AST/DeclObjC.h" 20#include "clang/AST/DeclTemplate.h" 21#include "clang/AST/ExprCXX.h" 22#include "clang/AST/StmtCXX.h" 23#include "clang/Parse/DeclSpec.h" 24#include "clang/Basic/TargetInfo.h" 25#include "clang/Basic/SourceManager.h" 26// FIXME: layering (ideally, Sema shouldn't be dependent on Lex API's) 27#include "clang/Lex/Preprocessor.h" 28#include "clang/Lex/HeaderSearch.h" 29#include "llvm/ADT/SmallSet.h" 30#include "llvm/ADT/STLExtras.h" 31#include <algorithm> 32#include <functional> 33using namespace clang; 34 35/// getDeclName - Return a pretty name for the specified decl if possible, or 36/// an empty string if not. This is used for pretty crash reporting. 37std::string Sema::getDeclName(DeclPtrTy d) { 38 Decl *D = d.getAs<Decl>(); 39 if (NamedDecl *DN = dyn_cast_or_null<NamedDecl>(D)) 40 return DN->getQualifiedNameAsString(); 41 return ""; 42} 43 44Sema::DeclGroupPtrTy Sema::ConvertDeclToDeclGroup(DeclPtrTy Ptr) { 45 return DeclGroupPtrTy::make(DeclGroupRef(Ptr.getAs<Decl>())); 46} 47 48/// \brief If the identifier refers to a type name within this scope, 49/// return the declaration of that type. 50/// 51/// This routine performs ordinary name lookup of the identifier II 52/// within the given scope, with optional C++ scope specifier SS, to 53/// determine whether the name refers to a type. If so, returns an 54/// opaque pointer (actually a QualType) corresponding to that 55/// type. Otherwise, returns NULL. 56/// 57/// If name lookup results in an ambiguity, this routine will complain 58/// and then return NULL. 59Sema::TypeTy *Sema::getTypeName(IdentifierInfo &II, SourceLocation NameLoc, 60 Scope *S, const CXXScopeSpec *SS) { 61 // C++ [temp.res]p3: 62 // A qualified-id that refers to a type and in which the 63 // nested-name-specifier depends on a template-parameter (14.6.2) 64 // shall be prefixed by the keyword typename to indicate that the 65 // qualified-id denotes a type, forming an 66 // elaborated-type-specifier (7.1.5.3). 67 // 68 // We therefore do not perform any name lookup if the result would 69 // refer to a member of an unknown specialization. 70 if (SS && isUnknownSpecialization(*SS)) 71 return 0; 72 73 LookupResult Result 74 = LookupParsedName(S, SS, &II, LookupOrdinaryName, false, false); 75 76 NamedDecl *IIDecl = 0; 77 switch (Result.getKind()) { 78 case LookupResult::NotFound: 79 case LookupResult::FoundOverloaded: 80 return 0; 81 82 case LookupResult::AmbiguousBaseSubobjectTypes: 83 case LookupResult::AmbiguousBaseSubobjects: 84 case LookupResult::AmbiguousReference: { 85 // Look to see if we have a type anywhere in the list of results. 86 for (LookupResult::iterator Res = Result.begin(), ResEnd = Result.end(); 87 Res != ResEnd; ++Res) { 88 if (isa<TypeDecl>(*Res) || isa<ObjCInterfaceDecl>(*Res)) { 89 if (!IIDecl || 90 (*Res)->getLocation().getRawEncoding() < 91 IIDecl->getLocation().getRawEncoding()) 92 IIDecl = *Res; 93 } 94 } 95 96 if (!IIDecl) { 97 // None of the entities we found is a type, so there is no way 98 // to even assume that the result is a type. In this case, don't 99 // complain about the ambiguity. The parser will either try to 100 // perform this lookup again (e.g., as an object name), which 101 // will produce the ambiguity, or will complain that it expected 102 // a type name. 103 Result.Destroy(); 104 return 0; 105 } 106 107 // We found a type within the ambiguous lookup; diagnose the 108 // ambiguity and then return that type. This might be the right 109 // answer, or it might not be, but it suppresses any attempt to 110 // perform the name lookup again. 111 DiagnoseAmbiguousLookup(Result, DeclarationName(&II), NameLoc); 112 break; 113 } 114 115 case LookupResult::Found: 116 IIDecl = Result.getAsDecl(); 117 break; 118 } 119 120 if (IIDecl) { 121 QualType T; 122 123 if (TypeDecl *TD = dyn_cast<TypeDecl>(IIDecl)) { 124 // Check whether we can use this type 125 (void)DiagnoseUseOfDecl(IIDecl, NameLoc); 126 127 if (getLangOptions().CPlusPlus) { 128 // C++ [temp.local]p2: 129 // Within the scope of a class template specialization or 130 // partial specialization, when the injected-class-name is 131 // not followed by a <, it is equivalent to the 132 // injected-class-name followed by the template-argument s 133 // of the class template specialization or partial 134 // specialization enclosed in <>. 135 if (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(TD)) 136 if (RD->isInjectedClassName()) 137 if (ClassTemplateDecl *Template = RD->getDescribedClassTemplate()) 138 T = Template->getInjectedClassNameType(Context); 139 } 140 141 if (T.isNull()) 142 T = Context.getTypeDeclType(TD); 143 } else if (ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(IIDecl)) { 144 // Check whether we can use this interface. 145 (void)DiagnoseUseOfDecl(IIDecl, NameLoc); 146 147 T = Context.getObjCInterfaceType(IDecl); 148 } else 149 return 0; 150 151 if (SS) 152 T = getQualifiedNameType(*SS, T); 153 154 return T.getAsOpaquePtr(); 155 } 156 157 return 0; 158} 159 160/// isTagName() - This method is called *for error recovery purposes only* 161/// to determine if the specified name is a valid tag name ("struct foo"). If 162/// so, this returns the TST for the tag corresponding to it (TST_enum, 163/// TST_union, TST_struct, TST_class). This is used to diagnose cases in C 164/// where the user forgot to specify the tag. 165DeclSpec::TST Sema::isTagName(IdentifierInfo &II, Scope *S) { 166 // Do a tag name lookup in this scope. 167 LookupResult R = LookupName(S, &II, LookupTagName, false, false); 168 if (R.getKind() == LookupResult::Found) 169 if (const TagDecl *TD = dyn_cast<TagDecl>(R.getAsDecl())) { 170 switch (TD->getTagKind()) { 171 case TagDecl::TK_struct: return DeclSpec::TST_struct; 172 case TagDecl::TK_union: return DeclSpec::TST_union; 173 case TagDecl::TK_class: return DeclSpec::TST_class; 174 case TagDecl::TK_enum: return DeclSpec::TST_enum; 175 } 176 } 177 178 return DeclSpec::TST_unspecified; 179} 180 181 182 183DeclContext *Sema::getContainingDC(DeclContext *DC) { 184 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(DC)) { 185 // A C++ out-of-line method will return to the file declaration context. 186 if (MD->isOutOfLine()) 187 return MD->getLexicalDeclContext(); 188 189 // A C++ inline method is parsed *after* the topmost class it was declared 190 // in is fully parsed (it's "complete"). 191 // The parsing of a C++ inline method happens at the declaration context of 192 // the topmost (non-nested) class it is lexically declared in. 193 assert(isa<CXXRecordDecl>(MD->getParent()) && "C++ method not in Record."); 194 DC = MD->getParent(); 195 while (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC->getLexicalParent())) 196 DC = RD; 197 198 // Return the declaration context of the topmost class the inline method is 199 // declared in. 200 return DC; 201 } 202 203 if (isa<ObjCMethodDecl>(DC)) 204 return Context.getTranslationUnitDecl(); 205 206 return DC->getLexicalParent(); 207} 208 209void Sema::PushDeclContext(Scope *S, DeclContext *DC) { 210 assert(getContainingDC(DC) == CurContext && 211 "The next DeclContext should be lexically contained in the current one."); 212 CurContext = DC; 213 S->setEntity(DC); 214} 215 216void Sema::PopDeclContext() { 217 assert(CurContext && "DeclContext imbalance!"); 218 219 CurContext = getContainingDC(CurContext); 220} 221 222/// EnterDeclaratorContext - Used when we must lookup names in the context 223/// of a declarator's nested name specifier. 224void Sema::EnterDeclaratorContext(Scope *S, DeclContext *DC) { 225 assert(PreDeclaratorDC == 0 && "Previous declarator context not popped?"); 226 PreDeclaratorDC = static_cast<DeclContext*>(S->getEntity()); 227 CurContext = DC; 228 assert(CurContext && "No context?"); 229 S->setEntity(CurContext); 230} 231 232void Sema::ExitDeclaratorContext(Scope *S) { 233 S->setEntity(PreDeclaratorDC); 234 PreDeclaratorDC = 0; 235 236 // Reset CurContext to the nearest enclosing context. 237 while (!S->getEntity() && S->getParent()) 238 S = S->getParent(); 239 CurContext = static_cast<DeclContext*>(S->getEntity()); 240 assert(CurContext && "No context?"); 241} 242 243/// \brief Determine whether we allow overloading of the function 244/// PrevDecl with another declaration. 245/// 246/// This routine determines whether overloading is possible, not 247/// whether some new function is actually an overload. It will return 248/// true in C++ (where we can always provide overloads) or, as an 249/// extension, in C when the previous function is already an 250/// overloaded function declaration or has the "overloadable" 251/// attribute. 252static bool AllowOverloadingOfFunction(Decl *PrevDecl, ASTContext &Context) { 253 if (Context.getLangOptions().CPlusPlus) 254 return true; 255 256 if (isa<OverloadedFunctionDecl>(PrevDecl)) 257 return true; 258 259 return PrevDecl->getAttr<OverloadableAttr>() != 0; 260} 261 262/// Add this decl to the scope shadowed decl chains. 263void Sema::PushOnScopeChains(NamedDecl *D, Scope *S) { 264 // Move up the scope chain until we find the nearest enclosing 265 // non-transparent context. The declaration will be introduced into this 266 // scope. 267 while (S->getEntity() && 268 ((DeclContext *)S->getEntity())->isTransparentContext()) 269 S = S->getParent(); 270 271 S->AddDecl(DeclPtrTy::make(D)); 272 273 // Add scoped declarations into their context, so that they can be 274 // found later. Declarations without a context won't be inserted 275 // into any context. 276 CurContext->addDecl(D); 277 278 // C++ [basic.scope]p4: 279 // -- exactly one declaration shall declare a class name or 280 // enumeration name that is not a typedef name and the other 281 // declarations shall all refer to the same object or 282 // enumerator, or all refer to functions and function templates; 283 // in this case the class name or enumeration name is hidden. 284 if (TagDecl *TD = dyn_cast<TagDecl>(D)) { 285 // We are pushing the name of a tag (enum or class). 286 if (CurContext->getLookupContext() 287 == TD->getDeclContext()->getLookupContext()) { 288 // We're pushing the tag into the current context, which might 289 // require some reshuffling in the identifier resolver. 290 IdentifierResolver::iterator 291 I = IdResolver.begin(TD->getDeclName()), 292 IEnd = IdResolver.end(); 293 if (I != IEnd && isDeclInScope(*I, CurContext, S)) { 294 NamedDecl *PrevDecl = *I; 295 for (; I != IEnd && isDeclInScope(*I, CurContext, S); 296 PrevDecl = *I, ++I) { 297 if (TD->declarationReplaces(*I)) { 298 // This is a redeclaration. Remove it from the chain and 299 // break out, so that we'll add in the shadowed 300 // declaration. 301 S->RemoveDecl(DeclPtrTy::make(*I)); 302 if (PrevDecl == *I) { 303 IdResolver.RemoveDecl(*I); 304 IdResolver.AddDecl(TD); 305 return; 306 } else { 307 IdResolver.RemoveDecl(*I); 308 break; 309 } 310 } 311 } 312 313 // There is already a declaration with the same name in the same 314 // scope, which is not a tag declaration. It must be found 315 // before we find the new declaration, so insert the new 316 // declaration at the end of the chain. 317 IdResolver.AddShadowedDecl(TD, PrevDecl); 318 319 return; 320 } 321 } 322 } else if ((isa<FunctionDecl>(D) && 323 AllowOverloadingOfFunction(D, Context)) || 324 isa<FunctionTemplateDecl>(D)) { 325 // We are pushing the name of a function or function template, 326 // which might be an overloaded name. 327 IdentifierResolver::iterator Redecl 328 = std::find_if(IdResolver.begin(D->getDeclName()), 329 IdResolver.end(), 330 std::bind1st(std::mem_fun(&NamedDecl::declarationReplaces), 331 D)); 332 if (Redecl != IdResolver.end() && 333 S->isDeclScope(DeclPtrTy::make(*Redecl))) { 334 // There is already a declaration of a function on our 335 // IdResolver chain. Replace it with this declaration. 336 S->RemoveDecl(DeclPtrTy::make(*Redecl)); 337 IdResolver.RemoveDecl(*Redecl); 338 } 339 } else if (isa<ObjCInterfaceDecl>(D)) { 340 // We're pushing an Objective-C interface into the current 341 // context. If there is already an alias declaration, remove it first. 342 for (IdentifierResolver::iterator 343 I = IdResolver.begin(D->getDeclName()), IEnd = IdResolver.end(); 344 I != IEnd; ++I) { 345 if (isa<ObjCCompatibleAliasDecl>(*I)) { 346 S->RemoveDecl(DeclPtrTy::make(*I)); 347 IdResolver.RemoveDecl(*I); 348 break; 349 } 350 } 351 } 352 353 IdResolver.AddDecl(D); 354} 355 356void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) { 357 if (S->decl_empty()) return; 358 assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) && 359 "Scope shouldn't contain decls!"); 360 361 for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end(); 362 I != E; ++I) { 363 Decl *TmpD = (*I).getAs<Decl>(); 364 assert(TmpD && "This decl didn't get pushed??"); 365 366 assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?"); 367 NamedDecl *D = cast<NamedDecl>(TmpD); 368 369 if (!D->getDeclName()) continue; 370 371 // Remove this name from our lexical scope. 372 IdResolver.RemoveDecl(D); 373 } 374} 375 376/// getObjCInterfaceDecl - Look up a for a class declaration in the scope. 377/// return 0 if one not found. 378ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *Id) { 379 // The third "scope" argument is 0 since we aren't enabling lazy built-in 380 // creation from this context. 381 NamedDecl *IDecl = LookupName(TUScope, Id, LookupOrdinaryName); 382 383 return dyn_cast_or_null<ObjCInterfaceDecl>(IDecl); 384} 385 386/// getNonFieldDeclScope - Retrieves the innermost scope, starting 387/// from S, where a non-field would be declared. This routine copes 388/// with the difference between C and C++ scoping rules in structs and 389/// unions. For example, the following code is well-formed in C but 390/// ill-formed in C++: 391/// @code 392/// struct S6 { 393/// enum { BAR } e; 394/// }; 395/// 396/// void test_S6() { 397/// struct S6 a; 398/// a.e = BAR; 399/// } 400/// @endcode 401/// For the declaration of BAR, this routine will return a different 402/// scope. The scope S will be the scope of the unnamed enumeration 403/// within S6. In C++, this routine will return the scope associated 404/// with S6, because the enumeration's scope is a transparent 405/// context but structures can contain non-field names. In C, this 406/// routine will return the translation unit scope, since the 407/// enumeration's scope is a transparent context and structures cannot 408/// contain non-field names. 409Scope *Sema::getNonFieldDeclScope(Scope *S) { 410 while (((S->getFlags() & Scope::DeclScope) == 0) || 411 (S->getEntity() && 412 ((DeclContext *)S->getEntity())->isTransparentContext()) || 413 (S->isClassScope() && !getLangOptions().CPlusPlus)) 414 S = S->getParent(); 415 return S; 416} 417 418void Sema::InitBuiltinVaListType() { 419 if (!Context.getBuiltinVaListType().isNull()) 420 return; 421 422 IdentifierInfo *VaIdent = &Context.Idents.get("__builtin_va_list"); 423 NamedDecl *VaDecl = LookupName(TUScope, VaIdent, LookupOrdinaryName); 424 TypedefDecl *VaTypedef = cast<TypedefDecl>(VaDecl); 425 Context.setBuiltinVaListType(Context.getTypedefType(VaTypedef)); 426} 427 428/// LazilyCreateBuiltin - The specified Builtin-ID was first used at 429/// file scope. lazily create a decl for it. ForRedeclaration is true 430/// if we're creating this built-in in anticipation of redeclaring the 431/// built-in. 432NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid, 433 Scope *S, bool ForRedeclaration, 434 SourceLocation Loc) { 435 Builtin::ID BID = (Builtin::ID)bid; 436 437 if (Context.BuiltinInfo.hasVAListUse(BID)) 438 InitBuiltinVaListType(); 439 440 ASTContext::GetBuiltinTypeError Error; 441 QualType R = Context.GetBuiltinType(BID, Error); 442 switch (Error) { 443 case ASTContext::GE_None: 444 // Okay 445 break; 446 447 case ASTContext::GE_Missing_FILE: 448 if (ForRedeclaration) 449 Diag(Loc, diag::err_implicit_decl_requires_stdio) 450 << Context.BuiltinInfo.GetName(BID); 451 return 0; 452 } 453 454 if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) { 455 Diag(Loc, diag::ext_implicit_lib_function_decl) 456 << Context.BuiltinInfo.GetName(BID) 457 << R; 458 if (Context.BuiltinInfo.getHeaderName(BID) && 459 Diags.getDiagnosticLevel(diag::ext_implicit_lib_function_decl) 460 != Diagnostic::Ignored) 461 Diag(Loc, diag::note_please_include_header) 462 << Context.BuiltinInfo.getHeaderName(BID) 463 << Context.BuiltinInfo.GetName(BID); 464 } 465 466 FunctionDecl *New = FunctionDecl::Create(Context, 467 Context.getTranslationUnitDecl(), 468 Loc, II, R, 469 FunctionDecl::Extern, false, 470 /*hasPrototype=*/true); 471 New->setImplicit(); 472 473 // Create Decl objects for each parameter, adding them to the 474 // FunctionDecl. 475 if (FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) { 476 llvm::SmallVector<ParmVarDecl*, 16> Params; 477 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) 478 Params.push_back(ParmVarDecl::Create(Context, New, SourceLocation(), 0, 479 FT->getArgType(i), VarDecl::None, 0)); 480 New->setParams(Context, Params.data(), Params.size()); 481 } 482 483 AddKnownFunctionAttributes(New); 484 485 // TUScope is the translation-unit scope to insert this function into. 486 // FIXME: This is hideous. We need to teach PushOnScopeChains to 487 // relate Scopes to DeclContexts, and probably eliminate CurContext 488 // entirely, but we're not there yet. 489 DeclContext *SavedContext = CurContext; 490 CurContext = Context.getTranslationUnitDecl(); 491 PushOnScopeChains(New, TUScope); 492 CurContext = SavedContext; 493 return New; 494} 495 496/// GetStdNamespace - This method gets the C++ "std" namespace. This is where 497/// everything from the standard library is defined. 498NamespaceDecl *Sema::GetStdNamespace() { 499 if (!StdNamespace) { 500 IdentifierInfo *StdIdent = &PP.getIdentifierTable().get("std"); 501 DeclContext *Global = Context.getTranslationUnitDecl(); 502 Decl *Std = LookupQualifiedName(Global, StdIdent, LookupNamespaceName); 503 StdNamespace = dyn_cast_or_null<NamespaceDecl>(Std); 504 } 505 return StdNamespace; 506} 507 508/// MergeTypeDefDecl - We just parsed a typedef 'New' which has the 509/// same name and scope as a previous declaration 'Old'. Figure out 510/// how to resolve this situation, merging decls or emitting 511/// diagnostics as appropriate. If there was an error, set New to be invalid. 512/// 513void Sema::MergeTypeDefDecl(TypedefDecl *New, Decl *OldD) { 514 // If either decl is known invalid already, set the new one to be invalid and 515 // don't bother doing any merging checks. 516 if (New->isInvalidDecl() || OldD->isInvalidDecl()) 517 return New->setInvalidDecl(); 518 519 // Allow multiple definitions for ObjC built-in typedefs. 520 // FIXME: Verify the underlying types are equivalent! 521 if (getLangOptions().ObjC1) { 522 const IdentifierInfo *TypeID = New->getIdentifier(); 523 switch (TypeID->getLength()) { 524 default: break; 525 case 2: 526 if (!TypeID->isStr("id")) 527 break; 528 // Install the built-in type for 'id', ignoring the current definition. 529 New->setTypeForDecl(Context.getObjCIdType().getTypePtr()); 530 return; 531 case 5: 532 if (!TypeID->isStr("Class")) 533 break; 534 // Install the built-in type for 'Class', ignoring the current definition. 535 New->setTypeForDecl(Context.getObjCClassType().getTypePtr()); 536 return; 537 case 3: 538 if (!TypeID->isStr("SEL")) 539 break; 540 Context.setObjCSelType(Context.getTypeDeclType(New)); 541 return; 542 case 8: 543 if (!TypeID->isStr("Protocol")) 544 break; 545 Context.setObjCProtoType(New->getUnderlyingType()); 546 return; 547 } 548 // Fall through - the typedef name was not a builtin type. 549 } 550 // Verify the old decl was also a type. 551 TypeDecl *Old = dyn_cast<TypeDecl>(OldD); 552 if (!Old) { 553 Diag(New->getLocation(), diag::err_redefinition_different_kind) 554 << New->getDeclName(); 555 if (OldD->getLocation().isValid()) 556 Diag(OldD->getLocation(), diag::note_previous_definition); 557 return New->setInvalidDecl(); 558 } 559 560 // Determine the "old" type we'll use for checking and diagnostics. 561 QualType OldType; 562 if (TypedefDecl *OldTypedef = dyn_cast<TypedefDecl>(Old)) 563 OldType = OldTypedef->getUnderlyingType(); 564 else 565 OldType = Context.getTypeDeclType(Old); 566 567 // If the typedef types are not identical, reject them in all languages and 568 // with any extensions enabled. 569 570 if (OldType != New->getUnderlyingType() && 571 Context.getCanonicalType(OldType) != 572 Context.getCanonicalType(New->getUnderlyingType())) { 573 Diag(New->getLocation(), diag::err_redefinition_different_typedef) 574 << New->getUnderlyingType() << OldType; 575 if (Old->getLocation().isValid()) 576 Diag(Old->getLocation(), diag::note_previous_definition); 577 return New->setInvalidDecl(); 578 } 579 580 if (getLangOptions().Microsoft) 581 return; 582 583 // C++ [dcl.typedef]p2: 584 // In a given non-class scope, a typedef specifier can be used to 585 // redefine the name of any type declared in that scope to refer 586 // to the type to which it already refers. 587 if (getLangOptions().CPlusPlus) { 588 if (!isa<CXXRecordDecl>(CurContext)) 589 return; 590 Diag(New->getLocation(), diag::err_redefinition) 591 << New->getDeclName(); 592 Diag(Old->getLocation(), diag::note_previous_definition); 593 return New->setInvalidDecl(); 594 } 595 596 // If we have a redefinition of a typedef in C, emit a warning. This warning 597 // is normally mapped to an error, but can be controlled with 598 // -Wtypedef-redefinition. If either the original or the redefinition is 599 // in a system header, don't emit this for compatibility with GCC. 600 if (PP.getDiagnostics().getSuppressSystemWarnings() && 601 (Context.getSourceManager().isInSystemHeader(Old->getLocation()) || 602 Context.getSourceManager().isInSystemHeader(New->getLocation()))) 603 return; 604 605 Diag(New->getLocation(), diag::warn_redefinition_of_typedef) 606 << New->getDeclName(); 607 Diag(Old->getLocation(), diag::note_previous_definition); 608 return; 609} 610 611/// DeclhasAttr - returns true if decl Declaration already has the target 612/// attribute. 613static bool 614DeclHasAttr(const Decl *decl, const Attr *target) { 615 for (const Attr *attr = decl->getAttrs(); attr; attr = attr->getNext()) 616 if (attr->getKind() == target->getKind()) 617 return true; 618 619 return false; 620} 621 622/// MergeAttributes - append attributes from the Old decl to the New one. 623static void MergeAttributes(Decl *New, Decl *Old, ASTContext &C) { 624 for (const Attr *attr = Old->getAttrs(); attr; attr = attr->getNext()) { 625 if (!DeclHasAttr(New, attr) && attr->isMerged()) { 626 Attr *NewAttr = attr->clone(C); 627 NewAttr->setInherited(true); 628 New->addAttr(NewAttr); 629 } 630 } 631} 632 633/// Used in MergeFunctionDecl to keep track of function parameters in 634/// C. 635struct GNUCompatibleParamWarning { 636 ParmVarDecl *OldParm; 637 ParmVarDecl *NewParm; 638 QualType PromotedType; 639}; 640 641/// MergeFunctionDecl - We just parsed a function 'New' from 642/// declarator D which has the same name and scope as a previous 643/// declaration 'Old'. Figure out how to resolve this situation, 644/// merging decls or emitting diagnostics as appropriate. 645/// 646/// In C++, New and Old must be declarations that are not 647/// overloaded. Use IsOverload to determine whether New and Old are 648/// overloaded, and to select the Old declaration that New should be 649/// merged with. 650/// 651/// Returns true if there was an error, false otherwise. 652bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD) { 653 assert(!isa<OverloadedFunctionDecl>(OldD) && 654 "Cannot merge with an overloaded function declaration"); 655 656 // Verify the old decl was also a function. 657 FunctionDecl *Old = 0; 658 if (FunctionTemplateDecl *OldFunctionTemplate 659 = dyn_cast<FunctionTemplateDecl>(OldD)) 660 Old = OldFunctionTemplate->getTemplatedDecl(); 661 else 662 Old = dyn_cast<FunctionDecl>(OldD); 663 if (!Old) { 664 Diag(New->getLocation(), diag::err_redefinition_different_kind) 665 << New->getDeclName(); 666 Diag(OldD->getLocation(), diag::note_previous_definition); 667 return true; 668 } 669 670 // Determine whether the previous declaration was a definition, 671 // implicit declaration, or a declaration. 672 diag::kind PrevDiag; 673 if (Old->isThisDeclarationADefinition()) 674 PrevDiag = diag::note_previous_definition; 675 else if (Old->isImplicit()) 676 PrevDiag = diag::note_previous_implicit_declaration; 677 else 678 PrevDiag = diag::note_previous_declaration; 679 680 QualType OldQType = Context.getCanonicalType(Old->getType()); 681 QualType NewQType = Context.getCanonicalType(New->getType()); 682 683 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) && 684 New->getStorageClass() == FunctionDecl::Static && 685 Old->getStorageClass() != FunctionDecl::Static) { 686 Diag(New->getLocation(), diag::err_static_non_static) 687 << New; 688 Diag(Old->getLocation(), PrevDiag); 689 return true; 690 } 691 692 if (getLangOptions().CPlusPlus) { 693 // (C++98 13.1p2): 694 // Certain function declarations cannot be overloaded: 695 // -- Function declarations that differ only in the return type 696 // cannot be overloaded. 697 QualType OldReturnType 698 = cast<FunctionType>(OldQType.getTypePtr())->getResultType(); 699 QualType NewReturnType 700 = cast<FunctionType>(NewQType.getTypePtr())->getResultType(); 701 if (OldReturnType != NewReturnType) { 702 Diag(New->getLocation(), diag::err_ovl_diff_return_type); 703 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 704 return true; 705 } 706 707 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 708 const CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 709 if (OldMethod && NewMethod && 710 NewMethod->getLexicalDeclContext()->isRecord()) { 711 // -- Member function declarations with the same name and the 712 // same parameter types cannot be overloaded if any of them 713 // is a static member function declaration. 714 if (OldMethod->isStatic() || NewMethod->isStatic()) { 715 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 716 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 717 return true; 718 } 719 720 // C++ [class.mem]p1: 721 // [...] A member shall not be declared twice in the 722 // member-specification, except that a nested class or member 723 // class template can be declared and then later defined. 724 unsigned NewDiag; 725 if (isa<CXXConstructorDecl>(OldMethod)) 726 NewDiag = diag::err_constructor_redeclared; 727 else if (isa<CXXDestructorDecl>(NewMethod)) 728 NewDiag = diag::err_destructor_redeclared; 729 else if (isa<CXXConversionDecl>(NewMethod)) 730 NewDiag = diag::err_conv_function_redeclared; 731 else 732 NewDiag = diag::err_member_redeclared; 733 734 Diag(New->getLocation(), NewDiag); 735 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 736 } 737 738 // (C++98 8.3.5p3): 739 // All declarations for a function shall agree exactly in both the 740 // return type and the parameter-type-list. 741 if (OldQType == NewQType) 742 return MergeCompatibleFunctionDecls(New, Old); 743 744 // Fall through for conflicting redeclarations and redefinitions. 745 } 746 747 // C: Function types need to be compatible, not identical. This handles 748 // duplicate function decls like "void f(int); void f(enum X);" properly. 749 if (!getLangOptions().CPlusPlus && 750 Context.typesAreCompatible(OldQType, NewQType)) { 751 const FunctionType *OldFuncType = OldQType->getAsFunctionType(); 752 const FunctionType *NewFuncType = NewQType->getAsFunctionType(); 753 const FunctionProtoType *OldProto = 0; 754 if (isa<FunctionNoProtoType>(NewFuncType) && 755 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) { 756 // The old declaration provided a function prototype, but the 757 // new declaration does not. Merge in the prototype. 758 assert(!OldProto->hasExceptionSpec() && "Exception spec in C"); 759 llvm::SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(), 760 OldProto->arg_type_end()); 761 NewQType = Context.getFunctionType(NewFuncType->getResultType(), 762 ParamTypes.data(), ParamTypes.size(), 763 OldProto->isVariadic(), 764 OldProto->getTypeQuals()); 765 New->setType(NewQType); 766 New->setHasInheritedPrototype(); 767 768 // Synthesize a parameter for each argument type. 769 llvm::SmallVector<ParmVarDecl*, 16> Params; 770 for (FunctionProtoType::arg_type_iterator 771 ParamType = OldProto->arg_type_begin(), 772 ParamEnd = OldProto->arg_type_end(); 773 ParamType != ParamEnd; ++ParamType) { 774 ParmVarDecl *Param = ParmVarDecl::Create(Context, New, 775 SourceLocation(), 0, 776 *ParamType, VarDecl::None, 777 0); 778 Param->setImplicit(); 779 Params.push_back(Param); 780 } 781 782 New->setParams(Context, Params.data(), Params.size()); 783 } 784 785 return MergeCompatibleFunctionDecls(New, Old); 786 } 787 788 // GNU C permits a K&R definition to follow a prototype declaration 789 // if the declared types of the parameters in the K&R definition 790 // match the types in the prototype declaration, even when the 791 // promoted types of the parameters from the K&R definition differ 792 // from the types in the prototype. GCC then keeps the types from 793 // the prototype. 794 // 795 // If a variadic prototype is followed by a non-variadic K&R definition, 796 // the K&R definition becomes variadic. This is sort of an edge case, but 797 // it's legal per the standard depending on how you read C99 6.7.5.3p15 and 798 // C99 6.9.1p8. 799 if (!getLangOptions().CPlusPlus && 800 Old->hasPrototype() && !New->hasPrototype() && 801 New->getType()->getAsFunctionProtoType() && 802 Old->getNumParams() == New->getNumParams()) { 803 llvm::SmallVector<QualType, 16> ArgTypes; 804 llvm::SmallVector<GNUCompatibleParamWarning, 16> Warnings; 805 const FunctionProtoType *OldProto 806 = Old->getType()->getAsFunctionProtoType(); 807 const FunctionProtoType *NewProto 808 = New->getType()->getAsFunctionProtoType(); 809 810 // Determine whether this is the GNU C extension. 811 QualType MergedReturn = Context.mergeTypes(OldProto->getResultType(), 812 NewProto->getResultType()); 813 bool LooseCompatible = !MergedReturn.isNull(); 814 for (unsigned Idx = 0, End = Old->getNumParams(); 815 LooseCompatible && Idx != End; ++Idx) { 816 ParmVarDecl *OldParm = Old->getParamDecl(Idx); 817 ParmVarDecl *NewParm = New->getParamDecl(Idx); 818 if (Context.typesAreCompatible(OldParm->getType(), 819 NewProto->getArgType(Idx))) { 820 ArgTypes.push_back(NewParm->getType()); 821 } else if (Context.typesAreCompatible(OldParm->getType(), 822 NewParm->getType())) { 823 GNUCompatibleParamWarning Warn 824 = { OldParm, NewParm, NewProto->getArgType(Idx) }; 825 Warnings.push_back(Warn); 826 ArgTypes.push_back(NewParm->getType()); 827 } else 828 LooseCompatible = false; 829 } 830 831 if (LooseCompatible) { 832 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) { 833 Diag(Warnings[Warn].NewParm->getLocation(), 834 diag::ext_param_promoted_not_compatible_with_prototype) 835 << Warnings[Warn].PromotedType 836 << Warnings[Warn].OldParm->getType(); 837 Diag(Warnings[Warn].OldParm->getLocation(), 838 diag::note_previous_declaration); 839 } 840 841 New->setType(Context.getFunctionType(MergedReturn, &ArgTypes[0], 842 ArgTypes.size(), 843 OldProto->isVariadic(), 0)); 844 return MergeCompatibleFunctionDecls(New, Old); 845 } 846 847 // Fall through to diagnose conflicting types. 848 } 849 850 // A function that has already been declared has been redeclared or defined 851 // with a different type- show appropriate diagnostic 852 if (unsigned BuiltinID = Old->getBuiltinID(Context)) { 853 // The user has declared a builtin function with an incompatible 854 // signature. 855 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 856 // The function the user is redeclaring is a library-defined 857 // function like 'malloc' or 'printf'. Warn about the 858 // redeclaration, then pretend that we don't know about this 859 // library built-in. 860 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; 861 Diag(Old->getLocation(), diag::note_previous_builtin_declaration) 862 << Old << Old->getType(); 863 New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin); 864 Old->setInvalidDecl(); 865 return false; 866 } 867 868 PrevDiag = diag::note_previous_builtin_declaration; 869 } 870 871 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 872 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 873 return true; 874} 875 876/// \brief Completes the merge of two function declarations that are 877/// known to be compatible. 878/// 879/// This routine handles the merging of attributes and other 880/// properties of function declarations form the old declaration to 881/// the new declaration, once we know that New is in fact a 882/// redeclaration of Old. 883/// 884/// \returns false 885bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old) { 886 // Merge the attributes 887 MergeAttributes(New, Old, Context); 888 889 // Merge the storage class. 890 if (Old->getStorageClass() != FunctionDecl::Extern) 891 New->setStorageClass(Old->getStorageClass()); 892 893 // Merge "inline" 894 if (Old->isInline()) 895 New->setInline(true); 896 897 // If this function declaration by itself qualifies as a C99 inline 898 // definition (C99 6.7.4p6), but the previous definition did not, 899 // then the function is not a C99 inline definition. 900 if (New->isC99InlineDefinition() && !Old->isC99InlineDefinition()) 901 New->setC99InlineDefinition(false); 902 else if (Old->isC99InlineDefinition() && !New->isC99InlineDefinition()) { 903 // Mark all preceding definitions as not being C99 inline definitions. 904 for (const FunctionDecl *Prev = Old; Prev; 905 Prev = Prev->getPreviousDeclaration()) 906 const_cast<FunctionDecl *>(Prev)->setC99InlineDefinition(false); 907 } 908 909 // Merge "pure" flag. 910 if (Old->isPure()) 911 New->setPure(); 912 913 // Merge the "deleted" flag. 914 if (Old->isDeleted()) 915 New->setDeleted(); 916 917 if (getLangOptions().CPlusPlus) 918 return MergeCXXFunctionDecl(New, Old); 919 920 return false; 921} 922 923/// MergeVarDecl - We just parsed a variable 'New' which has the same name 924/// and scope as a previous declaration 'Old'. Figure out how to resolve this 925/// situation, merging decls or emitting diagnostics as appropriate. 926/// 927/// Tentative definition rules (C99 6.9.2p2) are checked by 928/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 929/// definitions here, since the initializer hasn't been attached. 930/// 931void Sema::MergeVarDecl(VarDecl *New, Decl *OldD) { 932 // If either decl is invalid, make sure the new one is marked invalid and 933 // don't do any other checking. 934 if (New->isInvalidDecl() || OldD->isInvalidDecl()) 935 return New->setInvalidDecl(); 936 937 // Verify the old decl was also a variable. 938 VarDecl *Old = dyn_cast<VarDecl>(OldD); 939 if (!Old) { 940 Diag(New->getLocation(), diag::err_redefinition_different_kind) 941 << New->getDeclName(); 942 Diag(OldD->getLocation(), diag::note_previous_definition); 943 return New->setInvalidDecl(); 944 } 945 946 MergeAttributes(New, Old, Context); 947 948 // Merge the types 949 QualType MergedT; 950 if (getLangOptions().CPlusPlus) { 951 if (Context.hasSameType(New->getType(), Old->getType())) 952 MergedT = New->getType(); 953 } else { 954 MergedT = Context.mergeTypes(New->getType(), Old->getType()); 955 } 956 if (MergedT.isNull()) { 957 Diag(New->getLocation(), diag::err_redefinition_different_type) 958 << New->getDeclName(); 959 Diag(Old->getLocation(), diag::note_previous_definition); 960 return New->setInvalidDecl(); 961 } 962 New->setType(MergedT); 963 964 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 965 if (New->getStorageClass() == VarDecl::Static && 966 (Old->getStorageClass() == VarDecl::None || Old->hasExternalStorage())) { 967 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 968 Diag(Old->getLocation(), diag::note_previous_definition); 969 return New->setInvalidDecl(); 970 } 971 // C99 6.2.2p4: 972 // For an identifier declared with the storage-class specifier 973 // extern in a scope in which a prior declaration of that 974 // identifier is visible,23) if the prior declaration specifies 975 // internal or external linkage, the linkage of the identifier at 976 // the later declaration is the same as the linkage specified at 977 // the prior declaration. If no prior declaration is visible, or 978 // if the prior declaration specifies no linkage, then the 979 // identifier has external linkage. 980 if (New->hasExternalStorage() && Old->hasLinkage()) 981 /* Okay */; 982 else if (New->getStorageClass() != VarDecl::Static && 983 Old->getStorageClass() == VarDecl::Static) { 984 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 985 Diag(Old->getLocation(), diag::note_previous_definition); 986 return New->setInvalidDecl(); 987 } 988 989 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 990 991 // FIXME: The test for external storage here seems wrong? We still 992 // need to check for mismatches. 993 if (!New->hasExternalStorage() && !New->isFileVarDecl() && 994 // Don't complain about out-of-line definitions of static members. 995 !(Old->getLexicalDeclContext()->isRecord() && 996 !New->getLexicalDeclContext()->isRecord())) { 997 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 998 Diag(Old->getLocation(), diag::note_previous_definition); 999 return New->setInvalidDecl(); 1000 } 1001 1002 if (New->isThreadSpecified() && !Old->isThreadSpecified()) { 1003 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName(); 1004 Diag(Old->getLocation(), diag::note_previous_definition); 1005 } else if (!New->isThreadSpecified() && Old->isThreadSpecified()) { 1006 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName(); 1007 Diag(Old->getLocation(), diag::note_previous_definition); 1008 } 1009 1010 // Keep a chain of previous declarations. 1011 New->setPreviousDeclaration(Old); 1012} 1013 1014/// CheckParmsForFunctionDef - Check that the parameters of the given 1015/// function are appropriate for the definition of a function. This 1016/// takes care of any checks that cannot be performed on the 1017/// declaration itself, e.g., that the types of each of the function 1018/// parameters are complete. 1019bool Sema::CheckParmsForFunctionDef(FunctionDecl *FD) { 1020 bool HasInvalidParm = false; 1021 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 1022 ParmVarDecl *Param = FD->getParamDecl(p); 1023 1024 // C99 6.7.5.3p4: the parameters in a parameter type list in a 1025 // function declarator that is part of a function definition of 1026 // that function shall not have incomplete type. 1027 // 1028 // This is also C++ [dcl.fct]p6. 1029 if (!Param->isInvalidDecl() && 1030 RequireCompleteType(Param->getLocation(), Param->getType(), 1031 diag::err_typecheck_decl_incomplete_type)) { 1032 Param->setInvalidDecl(); 1033 HasInvalidParm = true; 1034 } 1035 1036 // C99 6.9.1p5: If the declarator includes a parameter type list, the 1037 // declaration of each parameter shall include an identifier. 1038 if (Param->getIdentifier() == 0 && 1039 !Param->isImplicit() && 1040 !getLangOptions().CPlusPlus) 1041 Diag(Param->getLocation(), diag::err_parameter_name_omitted); 1042 } 1043 1044 return HasInvalidParm; 1045} 1046 1047/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 1048/// no declarator (e.g. "struct foo;") is parsed. 1049Sema::DeclPtrTy Sema::ParsedFreeStandingDeclSpec(Scope *S, DeclSpec &DS) { 1050 // FIXME: Error on auto/register at file scope 1051 // FIXME: Error on inline/virtual/explicit 1052 // FIXME: Error on invalid restrict 1053 // FIXME: Warn on useless __thread 1054 // FIXME: Warn on useless const/volatile 1055 // FIXME: Warn on useless static/extern/typedef/private_extern/mutable 1056 // FIXME: Warn on useless attributes 1057 TagDecl *Tag = 0; 1058 if (DS.getTypeSpecType() == DeclSpec::TST_class || 1059 DS.getTypeSpecType() == DeclSpec::TST_struct || 1060 DS.getTypeSpecType() == DeclSpec::TST_union || 1061 DS.getTypeSpecType() == DeclSpec::TST_enum) { 1062 if (!DS.getTypeRep()) // We probably had an error 1063 return DeclPtrTy(); 1064 1065 Tag = dyn_cast<TagDecl>(static_cast<Decl *>(DS.getTypeRep())); 1066 } 1067 1068 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 1069 if (!Record->getDeclName() && Record->isDefinition() && 1070 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { 1071 if (getLangOptions().CPlusPlus || 1072 Record->getDeclContext()->isRecord()) 1073 return BuildAnonymousStructOrUnion(S, DS, Record); 1074 1075 Diag(DS.getSourceRange().getBegin(), diag::err_no_declarators) 1076 << DS.getSourceRange(); 1077 } 1078 1079 // Microsoft allows unnamed struct/union fields. Don't complain 1080 // about them. 1081 // FIXME: Should we support Microsoft's extensions in this area? 1082 if (Record->getDeclName() && getLangOptions().Microsoft) 1083 return DeclPtrTy::make(Tag); 1084 } 1085 1086 if (!DS.isMissingDeclaratorOk() && 1087 DS.getTypeSpecType() != DeclSpec::TST_error) { 1088 // Warn about typedefs of enums without names, since this is an 1089 // extension in both Microsoft an GNU. 1090 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 1091 Tag && isa<EnumDecl>(Tag)) { 1092 Diag(DS.getSourceRange().getBegin(), diag::ext_typedef_without_a_name) 1093 << DS.getSourceRange(); 1094 return DeclPtrTy::make(Tag); 1095 } 1096 1097 Diag(DS.getSourceRange().getBegin(), diag::err_no_declarators) 1098 << DS.getSourceRange(); 1099 return DeclPtrTy(); 1100 } 1101 1102 return DeclPtrTy::make(Tag); 1103} 1104 1105/// InjectAnonymousStructOrUnionMembers - Inject the members of the 1106/// anonymous struct or union AnonRecord into the owning context Owner 1107/// and scope S. This routine will be invoked just after we realize 1108/// that an unnamed union or struct is actually an anonymous union or 1109/// struct, e.g., 1110/// 1111/// @code 1112/// union { 1113/// int i; 1114/// float f; 1115/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 1116/// // f into the surrounding scope.x 1117/// @endcode 1118/// 1119/// This routine is recursive, injecting the names of nested anonymous 1120/// structs/unions into the owning context and scope as well. 1121bool Sema::InjectAnonymousStructOrUnionMembers(Scope *S, DeclContext *Owner, 1122 RecordDecl *AnonRecord) { 1123 bool Invalid = false; 1124 for (RecordDecl::field_iterator F = AnonRecord->field_begin(), 1125 FEnd = AnonRecord->field_end(); 1126 F != FEnd; ++F) { 1127 if ((*F)->getDeclName()) { 1128 NamedDecl *PrevDecl = LookupQualifiedName(Owner, (*F)->getDeclName(), 1129 LookupOrdinaryName, true); 1130 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 1131 // C++ [class.union]p2: 1132 // The names of the members of an anonymous union shall be 1133 // distinct from the names of any other entity in the 1134 // scope in which the anonymous union is declared. 1135 unsigned diagKind 1136 = AnonRecord->isUnion()? diag::err_anonymous_union_member_redecl 1137 : diag::err_anonymous_struct_member_redecl; 1138 Diag((*F)->getLocation(), diagKind) 1139 << (*F)->getDeclName(); 1140 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 1141 Invalid = true; 1142 } else { 1143 // C++ [class.union]p2: 1144 // For the purpose of name lookup, after the anonymous union 1145 // definition, the members of the anonymous union are 1146 // considered to have been defined in the scope in which the 1147 // anonymous union is declared. 1148 Owner->makeDeclVisibleInContext(*F); 1149 S->AddDecl(DeclPtrTy::make(*F)); 1150 IdResolver.AddDecl(*F); 1151 } 1152 } else if (const RecordType *InnerRecordType 1153 = (*F)->getType()->getAsRecordType()) { 1154 RecordDecl *InnerRecord = InnerRecordType->getDecl(); 1155 if (InnerRecord->isAnonymousStructOrUnion()) 1156 Invalid = Invalid || 1157 InjectAnonymousStructOrUnionMembers(S, Owner, InnerRecord); 1158 } 1159 } 1160 1161 return Invalid; 1162} 1163 1164/// ActOnAnonymousStructOrUnion - Handle the declaration of an 1165/// anonymous structure or union. Anonymous unions are a C++ feature 1166/// (C++ [class.union]) and a GNU C extension; anonymous structures 1167/// are a GNU C and GNU C++ extension. 1168Sema::DeclPtrTy Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 1169 RecordDecl *Record) { 1170 DeclContext *Owner = Record->getDeclContext(); 1171 1172 // Diagnose whether this anonymous struct/union is an extension. 1173 if (Record->isUnion() && !getLangOptions().CPlusPlus) 1174 Diag(Record->getLocation(), diag::ext_anonymous_union); 1175 else if (!Record->isUnion()) 1176 Diag(Record->getLocation(), diag::ext_anonymous_struct); 1177 1178 // C and C++ require different kinds of checks for anonymous 1179 // structs/unions. 1180 bool Invalid = false; 1181 if (getLangOptions().CPlusPlus) { 1182 const char* PrevSpec = 0; 1183 // C++ [class.union]p3: 1184 // Anonymous unions declared in a named namespace or in the 1185 // global namespace shall be declared static. 1186 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 1187 (isa<TranslationUnitDecl>(Owner) || 1188 (isa<NamespaceDecl>(Owner) && 1189 cast<NamespaceDecl>(Owner)->getDeclName()))) { 1190 Diag(Record->getLocation(), diag::err_anonymous_union_not_static); 1191 Invalid = true; 1192 1193 // Recover by adding 'static'. 1194 DS.SetStorageClassSpec(DeclSpec::SCS_static, SourceLocation(), PrevSpec); 1195 } 1196 // C++ [class.union]p3: 1197 // A storage class is not allowed in a declaration of an 1198 // anonymous union in a class scope. 1199 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 1200 isa<RecordDecl>(Owner)) { 1201 Diag(DS.getStorageClassSpecLoc(), 1202 diag::err_anonymous_union_with_storage_spec); 1203 Invalid = true; 1204 1205 // Recover by removing the storage specifier. 1206 DS.SetStorageClassSpec(DeclSpec::SCS_unspecified, SourceLocation(), 1207 PrevSpec); 1208 } 1209 1210 // C++ [class.union]p2: 1211 // The member-specification of an anonymous union shall only 1212 // define non-static data members. [Note: nested types and 1213 // functions cannot be declared within an anonymous union. ] 1214 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 1215 MemEnd = Record->decls_end(); 1216 Mem != MemEnd; ++Mem) { 1217 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 1218 // C++ [class.union]p3: 1219 // An anonymous union shall not have private or protected 1220 // members (clause 11). 1221 if (FD->getAccess() == AS_protected || FD->getAccess() == AS_private) { 1222 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 1223 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 1224 Invalid = true; 1225 } 1226 } else if ((*Mem)->isImplicit()) { 1227 // Any implicit members are fine. 1228 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 1229 // This is a type that showed up in an 1230 // elaborated-type-specifier inside the anonymous struct or 1231 // union, but which actually declares a type outside of the 1232 // anonymous struct or union. It's okay. 1233 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 1234 if (!MemRecord->isAnonymousStructOrUnion() && 1235 MemRecord->getDeclName()) { 1236 // This is a nested type declaration. 1237 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 1238 << (int)Record->isUnion(); 1239 Invalid = true; 1240 } 1241 } else { 1242 // We have something that isn't a non-static data 1243 // member. Complain about it. 1244 unsigned DK = diag::err_anonymous_record_bad_member; 1245 if (isa<TypeDecl>(*Mem)) 1246 DK = diag::err_anonymous_record_with_type; 1247 else if (isa<FunctionDecl>(*Mem)) 1248 DK = diag::err_anonymous_record_with_function; 1249 else if (isa<VarDecl>(*Mem)) 1250 DK = diag::err_anonymous_record_with_static; 1251 Diag((*Mem)->getLocation(), DK) 1252 << (int)Record->isUnion(); 1253 Invalid = true; 1254 } 1255 } 1256 } 1257 1258 if (!Record->isUnion() && !Owner->isRecord()) { 1259 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 1260 << (int)getLangOptions().CPlusPlus; 1261 Invalid = true; 1262 } 1263 1264 // Create a declaration for this anonymous struct/union. 1265 NamedDecl *Anon = 0; 1266 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 1267 Anon = FieldDecl::Create(Context, OwningClass, Record->getLocation(), 1268 /*IdentifierInfo=*/0, 1269 Context.getTypeDeclType(Record), 1270 /*BitWidth=*/0, /*Mutable=*/false, 1271 DS.getSourceRange().getBegin()); 1272 Anon->setAccess(AS_public); 1273 if (getLangOptions().CPlusPlus) 1274 FieldCollector->Add(cast<FieldDecl>(Anon)); 1275 } else { 1276 VarDecl::StorageClass SC; 1277 switch (DS.getStorageClassSpec()) { 1278 default: assert(0 && "Unknown storage class!"); 1279 case DeclSpec::SCS_unspecified: SC = VarDecl::None; break; 1280 case DeclSpec::SCS_extern: SC = VarDecl::Extern; break; 1281 case DeclSpec::SCS_static: SC = VarDecl::Static; break; 1282 case DeclSpec::SCS_auto: SC = VarDecl::Auto; break; 1283 case DeclSpec::SCS_register: SC = VarDecl::Register; break; 1284 case DeclSpec::SCS_private_extern: SC = VarDecl::PrivateExtern; break; 1285 case DeclSpec::SCS_mutable: 1286 // mutable can only appear on non-static class members, so it's always 1287 // an error here 1288 Diag(Record->getLocation(), diag::err_mutable_nonmember); 1289 Invalid = true; 1290 SC = VarDecl::None; 1291 break; 1292 } 1293 1294 Anon = VarDecl::Create(Context, Owner, Record->getLocation(), 1295 /*IdentifierInfo=*/0, 1296 Context.getTypeDeclType(Record), 1297 SC, DS.getSourceRange().getBegin()); 1298 } 1299 Anon->setImplicit(); 1300 1301 // Add the anonymous struct/union object to the current 1302 // context. We'll be referencing this object when we refer to one of 1303 // its members. 1304 Owner->addDecl(Anon); 1305 1306 // Inject the members of the anonymous struct/union into the owning 1307 // context and into the identifier resolver chain for name lookup 1308 // purposes. 1309 if (InjectAnonymousStructOrUnionMembers(S, Owner, Record)) 1310 Invalid = true; 1311 1312 // Mark this as an anonymous struct/union type. Note that we do not 1313 // do this until after we have already checked and injected the 1314 // members of this anonymous struct/union type, because otherwise 1315 // the members could be injected twice: once by DeclContext when it 1316 // builds its lookup table, and once by 1317 // InjectAnonymousStructOrUnionMembers. 1318 Record->setAnonymousStructOrUnion(true); 1319 1320 if (Invalid) 1321 Anon->setInvalidDecl(); 1322 1323 return DeclPtrTy::make(Anon); 1324} 1325 1326 1327/// GetNameForDeclarator - Determine the full declaration name for the 1328/// given Declarator. 1329DeclarationName Sema::GetNameForDeclarator(Declarator &D) { 1330 switch (D.getKind()) { 1331 case Declarator::DK_Abstract: 1332 assert(D.getIdentifier() == 0 && "abstract declarators have no name"); 1333 return DeclarationName(); 1334 1335 case Declarator::DK_Normal: 1336 assert (D.getIdentifier() != 0 && "normal declarators have an identifier"); 1337 return DeclarationName(D.getIdentifier()); 1338 1339 case Declarator::DK_Constructor: { 1340 QualType Ty = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1341 Ty = Context.getCanonicalType(Ty); 1342 return Context.DeclarationNames.getCXXConstructorName(Ty); 1343 } 1344 1345 case Declarator::DK_Destructor: { 1346 QualType Ty = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1347 Ty = Context.getCanonicalType(Ty); 1348 return Context.DeclarationNames.getCXXDestructorName(Ty); 1349 } 1350 1351 case Declarator::DK_Conversion: { 1352 // FIXME: We'd like to keep the non-canonical type for diagnostics! 1353 QualType Ty = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1354 Ty = Context.getCanonicalType(Ty); 1355 return Context.DeclarationNames.getCXXConversionFunctionName(Ty); 1356 } 1357 1358 case Declarator::DK_Operator: 1359 assert(D.getIdentifier() == 0 && "operator names have no identifier"); 1360 return Context.DeclarationNames.getCXXOperatorName( 1361 D.getOverloadedOperator()); 1362 } 1363 1364 assert(false && "Unknown name kind"); 1365 return DeclarationName(); 1366} 1367 1368/// isNearlyMatchingFunction - Determine whether the C++ functions 1369/// Declaration and Definition are "nearly" matching. This heuristic 1370/// is used to improve diagnostics in the case where an out-of-line 1371/// function definition doesn't match any declaration within 1372/// the class or namespace. 1373static bool isNearlyMatchingFunction(ASTContext &Context, 1374 FunctionDecl *Declaration, 1375 FunctionDecl *Definition) { 1376 if (Declaration->param_size() != Definition->param_size()) 1377 return false; 1378 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 1379 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 1380 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 1381 1382 DeclParamTy = Context.getCanonicalType(DeclParamTy.getNonReferenceType()); 1383 DefParamTy = Context.getCanonicalType(DefParamTy.getNonReferenceType()); 1384 if (DeclParamTy.getUnqualifiedType() != DefParamTy.getUnqualifiedType()) 1385 return false; 1386 } 1387 1388 return true; 1389} 1390 1391Sema::DeclPtrTy 1392Sema::HandleDeclarator(Scope *S, Declarator &D, 1393 MultiTemplateParamsArg TemplateParamLists, 1394 bool IsFunctionDefinition) { 1395 DeclarationName Name = GetNameForDeclarator(D); 1396 1397 // All of these full declarators require an identifier. If it doesn't have 1398 // one, the ParsedFreeStandingDeclSpec action should be used. 1399 if (!Name) { 1400 if (!D.isInvalidType()) // Reject this if we think it is valid. 1401 Diag(D.getDeclSpec().getSourceRange().getBegin(), 1402 diag::err_declarator_need_ident) 1403 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 1404 return DeclPtrTy(); 1405 } 1406 1407 // The scope passed in may not be a decl scope. Zip up the scope tree until 1408 // we find one that is. 1409 while ((S->getFlags() & Scope::DeclScope) == 0 || 1410 (S->getFlags() & Scope::TemplateParamScope) != 0) 1411 S = S->getParent(); 1412 1413 DeclContext *DC; 1414 NamedDecl *PrevDecl; 1415 NamedDecl *New; 1416 1417 QualType R = GetTypeForDeclarator(D, S); 1418 1419 // See if this is a redefinition of a variable in the same scope. 1420 if (D.getCXXScopeSpec().isInvalid()) { 1421 DC = CurContext; 1422 PrevDecl = 0; 1423 D.setInvalidType(); 1424 } else if (!D.getCXXScopeSpec().isSet()) { 1425 LookupNameKind NameKind = LookupOrdinaryName; 1426 1427 // If the declaration we're planning to build will be a function 1428 // or object with linkage, then look for another declaration with 1429 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 1430 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 1431 /* Do nothing*/; 1432 else if (R->isFunctionType()) { 1433 if (CurContext->isFunctionOrMethod() || 1434 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 1435 NameKind = LookupRedeclarationWithLinkage; 1436 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 1437 NameKind = LookupRedeclarationWithLinkage; 1438 else if (CurContext->getLookupContext()->isTranslationUnit() && 1439 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 1440 NameKind = LookupRedeclarationWithLinkage; 1441 1442 DC = CurContext; 1443 PrevDecl = LookupName(S, Name, NameKind, true, 1444 NameKind == LookupRedeclarationWithLinkage, 1445 D.getIdentifierLoc()); 1446 } else { // Something like "int foo::x;" 1447 DC = computeDeclContext(D.getCXXScopeSpec(), true); 1448 // FIXME: RequireCompleteDeclContext(D.getCXXScopeSpec()); ? 1449 PrevDecl = LookupQualifiedName(DC, Name, LookupOrdinaryName, true); 1450 1451 // C++ 7.3.1.2p2: 1452 // Members (including explicit specializations of templates) of a named 1453 // namespace can also be defined outside that namespace by explicit 1454 // qualification of the name being defined, provided that the entity being 1455 // defined was already declared in the namespace and the definition appears 1456 // after the point of declaration in a namespace that encloses the 1457 // declarations namespace. 1458 // 1459 // Note that we only check the context at this point. We don't yet 1460 // have enough information to make sure that PrevDecl is actually 1461 // the declaration we want to match. For example, given: 1462 // 1463 // class X { 1464 // void f(); 1465 // void f(float); 1466 // }; 1467 // 1468 // void X::f(int) { } // ill-formed 1469 // 1470 // In this case, PrevDecl will point to the overload set 1471 // containing the two f's declared in X, but neither of them 1472 // matches. 1473 1474 // First check whether we named the global scope. 1475 if (isa<TranslationUnitDecl>(DC)) { 1476 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 1477 << Name << D.getCXXScopeSpec().getRange(); 1478 } else if (!CurContext->Encloses(DC)) { 1479 // The qualifying scope doesn't enclose the original declaration. 1480 // Emit diagnostic based on current scope. 1481 SourceLocation L = D.getIdentifierLoc(); 1482 SourceRange R = D.getCXXScopeSpec().getRange(); 1483 if (isa<FunctionDecl>(CurContext)) 1484 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 1485 else 1486 Diag(L, diag::err_invalid_declarator_scope) 1487 << Name << cast<NamedDecl>(DC) << R; 1488 D.setInvalidType(); 1489 } 1490 } 1491 1492 if (PrevDecl && PrevDecl->isTemplateParameter()) { 1493 // Maybe we will complain about the shadowed template parameter. 1494 if (!D.isInvalidType()) 1495 if (DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl)) 1496 D.setInvalidType(); 1497 1498 // Just pretend that we didn't see the previous declaration. 1499 PrevDecl = 0; 1500 } 1501 1502 // In C++, the previous declaration we find might be a tag type 1503 // (class or enum). In this case, the new declaration will hide the 1504 // tag type. Note that this does does not apply if we're declaring a 1505 // typedef (C++ [dcl.typedef]p4). 1506 if (PrevDecl && PrevDecl->getIdentifierNamespace() == Decl::IDNS_Tag && 1507 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 1508 PrevDecl = 0; 1509 1510 bool Redeclaration = false; 1511 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 1512 if (TemplateParamLists.size()) { 1513 Diag(D.getIdentifierLoc(), diag::err_template_typedef); 1514 return DeclPtrTy(); 1515 } 1516 1517 New = ActOnTypedefDeclarator(S, D, DC, R, PrevDecl, Redeclaration); 1518 } else if (R->isFunctionType()) { 1519 New = ActOnFunctionDeclarator(S, D, DC, R, PrevDecl, 1520 move(TemplateParamLists), 1521 IsFunctionDefinition, Redeclaration); 1522 } else { 1523 New = ActOnVariableDeclarator(S, D, DC, R, PrevDecl, 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 NewVD->hasAttr<BlocksAttr>()) 1958 CurFunctionNeedsScopeChecking = true; 1959 1960 if ((isVM && NewVD->hasLinkage()) || 1961 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { 1962 bool SizeIsNegative; 1963 QualType FixedTy = 1964 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative); 1965 1966 if (FixedTy.isNull() && T->isVariableArrayType()) { 1967 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 1968 // FIXME: This won't give the correct result for 1969 // int a[10][n]; 1970 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 1971 1972 if (NewVD->isFileVarDecl()) 1973 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 1974 << SizeRange; 1975 else if (NewVD->getStorageClass() == VarDecl::Static) 1976 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 1977 << SizeRange; 1978 else 1979 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 1980 << SizeRange; 1981 return NewVD->setInvalidDecl(); 1982 } 1983 1984 if (FixedTy.isNull()) { 1985 if (NewVD->isFileVarDecl()) 1986 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 1987 else 1988 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 1989 return NewVD->setInvalidDecl(); 1990 } 1991 1992 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 1993 NewVD->setType(FixedTy); 1994 } 1995 1996 if (!PrevDecl && NewVD->isExternC(Context)) { 1997 // Since we did not find anything by this name and we're declaring 1998 // an extern "C" variable, look for a non-visible extern "C" 1999 // declaration with the same name. 2000 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 2001 = LocallyScopedExternalDecls.find(NewVD->getDeclName()); 2002 if (Pos != LocallyScopedExternalDecls.end()) 2003 PrevDecl = Pos->second; 2004 } 2005 2006 if (T->isVoidType() && !NewVD->hasExternalStorage()) { 2007 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 2008 << T; 2009 return NewVD->setInvalidDecl(); 2010 } 2011 2012 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { 2013 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); 2014 return NewVD->setInvalidDecl(); 2015 } 2016 2017 if (isVM && NewVD->hasAttr<BlocksAttr>()) { 2018 Diag(NewVD->getLocation(), diag::err_block_on_vm); 2019 return NewVD->setInvalidDecl(); 2020 } 2021 2022 if (PrevDecl) { 2023 Redeclaration = true; 2024 MergeVarDecl(NewVD, PrevDecl); 2025 } 2026} 2027 2028NamedDecl* 2029Sema::ActOnFunctionDeclarator(Scope* S, Declarator& D, DeclContext* DC, 2030 QualType R, NamedDecl* PrevDecl, 2031 MultiTemplateParamsArg TemplateParamLists, 2032 bool IsFunctionDefinition, bool &Redeclaration) { 2033 assert(R.getTypePtr()->isFunctionType()); 2034 2035 DeclarationName Name = GetNameForDeclarator(D); 2036 FunctionDecl::StorageClass SC = FunctionDecl::None; 2037 switch (D.getDeclSpec().getStorageClassSpec()) { 2038 default: assert(0 && "Unknown storage class!"); 2039 case DeclSpec::SCS_auto: 2040 case DeclSpec::SCS_register: 2041 case DeclSpec::SCS_mutable: 2042 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2043 diag::err_typecheck_sclass_func); 2044 D.setInvalidType(); 2045 break; 2046 case DeclSpec::SCS_unspecified: SC = FunctionDecl::None; break; 2047 case DeclSpec::SCS_extern: SC = FunctionDecl::Extern; break; 2048 case DeclSpec::SCS_static: { 2049 if (CurContext->getLookupContext()->isFunctionOrMethod()) { 2050 // C99 6.7.1p5: 2051 // The declaration of an identifier for a function that has 2052 // block scope shall have no explicit storage-class specifier 2053 // other than extern 2054 // See also (C++ [dcl.stc]p4). 2055 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2056 diag::err_static_block_func); 2057 SC = FunctionDecl::None; 2058 } else 2059 SC = FunctionDecl::Static; 2060 break; 2061 } 2062 case DeclSpec::SCS_private_extern: SC = FunctionDecl::PrivateExtern;break; 2063 } 2064 2065 if (D.getDeclSpec().isThreadSpecified()) 2066 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 2067 2068 bool isInline = D.getDeclSpec().isInlineSpecified(); 2069 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2070 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 2071 2072 // Check that the return type is not an abstract class type. 2073 // For record types, this is done by the AbstractClassUsageDiagnoser once 2074 // the class has been completely parsed. 2075 if (!DC->isRecord() && 2076 RequireNonAbstractType(D.getIdentifierLoc(), 2077 R->getAsFunctionType()->getResultType(), 2078 diag::err_abstract_type_in_decl, 2079 AbstractReturnType)) 2080 D.setInvalidType(); 2081 2082 // Do not allow returning a objc interface by-value. 2083 if (R->getAsFunctionType()->getResultType()->isObjCInterfaceType()) { 2084 Diag(D.getIdentifierLoc(), 2085 diag::err_object_cannot_be_passed_returned_by_value) << 0 2086 << R->getAsFunctionType()->getResultType(); 2087 D.setInvalidType(); 2088 } 2089 2090 // Check that we can declare a template here. 2091 if (TemplateParamLists.size() && 2092 CheckTemplateDeclScope(S, TemplateParamLists)) 2093 return 0; 2094 2095 bool isVirtualOkay = false; 2096 FunctionDecl *NewFD; 2097 if (D.getKind() == Declarator::DK_Constructor) { 2098 // This is a C++ constructor declaration. 2099 assert(DC->isRecord() && 2100 "Constructors can only be declared in a member context"); 2101 2102 R = CheckConstructorDeclarator(D, R, SC); 2103 2104 // Create the new declaration 2105 NewFD = CXXConstructorDecl::Create(Context, 2106 cast<CXXRecordDecl>(DC), 2107 D.getIdentifierLoc(), Name, R, 2108 isExplicit, isInline, 2109 /*isImplicitlyDeclared=*/false); 2110 } else if (D.getKind() == Declarator::DK_Destructor) { 2111 // This is a C++ destructor declaration. 2112 if (DC->isRecord()) { 2113 R = CheckDestructorDeclarator(D, SC); 2114 2115 NewFD = CXXDestructorDecl::Create(Context, 2116 cast<CXXRecordDecl>(DC), 2117 D.getIdentifierLoc(), Name, R, 2118 isInline, 2119 /*isImplicitlyDeclared=*/false); 2120 2121 isVirtualOkay = true; 2122 } else { 2123 Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 2124 2125 // Create a FunctionDecl to satisfy the function definition parsing 2126 // code path. 2127 NewFD = FunctionDecl::Create(Context, DC, D.getIdentifierLoc(), 2128 Name, R, SC, isInline, 2129 /*hasPrototype=*/true, 2130 // FIXME: Move to DeclGroup... 2131 D.getDeclSpec().getSourceRange().getBegin()); 2132 D.setInvalidType(); 2133 } 2134 } else if (D.getKind() == Declarator::DK_Conversion) { 2135 if (!DC->isRecord()) { 2136 Diag(D.getIdentifierLoc(), 2137 diag::err_conv_function_not_member); 2138 return 0; 2139 } 2140 2141 CheckConversionDeclarator(D, R, SC); 2142 NewFD = CXXConversionDecl::Create(Context, cast<CXXRecordDecl>(DC), 2143 D.getIdentifierLoc(), Name, R, 2144 isInline, isExplicit); 2145 2146 isVirtualOkay = true; 2147 } else if (DC->isRecord()) { 2148 // If the of the function is the same as the name of the record, then this 2149 // must be an invalid constructor that has a return type. 2150 // (The parser checks for a return type and makes the declarator a 2151 // constructor if it has no return type). 2152 // must have an invalid constructor that has a return type 2153 if (Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ 2154 Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 2155 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2156 << SourceRange(D.getIdentifierLoc()); 2157 return 0; 2158 } 2159 2160 // This is a C++ method declaration. 2161 NewFD = CXXMethodDecl::Create(Context, cast<CXXRecordDecl>(DC), 2162 D.getIdentifierLoc(), Name, R, 2163 (SC == FunctionDecl::Static), isInline); 2164 2165 isVirtualOkay = (SC != FunctionDecl::Static); 2166 } else { 2167 // Determine whether the function was written with a 2168 // prototype. This true when: 2169 // - we're in C++ (where every function has a prototype), 2170 // - there is a prototype in the declarator, or 2171 // - the type R of the function is some kind of typedef or other reference 2172 // to a type name (which eventually refers to a function type). 2173 bool HasPrototype = 2174 getLangOptions().CPlusPlus || 2175 (D.getNumTypeObjects() && D.getTypeObject(0).Fun.hasPrototype) || 2176 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 2177 2178 NewFD = FunctionDecl::Create(Context, DC, 2179 D.getIdentifierLoc(), 2180 Name, R, SC, isInline, HasPrototype, 2181 // FIXME: Move to DeclGroup... 2182 D.getDeclSpec().getSourceRange().getBegin()); 2183 } 2184 2185 if (D.isInvalidType()) 2186 NewFD->setInvalidDecl(); 2187 2188 // Set the lexical context. If the declarator has a C++ 2189 // scope specifier, the lexical context will be different 2190 // from the semantic context. 2191 NewFD->setLexicalDeclContext(CurContext); 2192 2193 // Match up the template parameter lists with the scope specifier, then 2194 // determine whether we have a template or a template specialization. 2195 FunctionTemplateDecl *FunctionTemplate = 0; 2196 if (TemplateParameterList *TemplateParams 2197 = MatchTemplateParametersToScopeSpecifier( 2198 D.getDeclSpec().getSourceRange().getBegin(), 2199 D.getCXXScopeSpec(), 2200 (TemplateParameterList**)TemplateParamLists.release(), 2201 TemplateParamLists.size())) { 2202 if (TemplateParams->size() > 0) { 2203 // This is a function template 2204 FunctionTemplate = FunctionTemplateDecl::Create(Context, CurContext, 2205 NewFD->getLocation(), 2206 Name, TemplateParams, 2207 NewFD); 2208 NewFD->setDescribedFunctionTemplate(FunctionTemplate); 2209 } else { 2210 // FIXME: Handle function template specializations 2211 } 2212 } 2213 2214 2215 // C++ [dcl.fct.spec]p5: 2216 // The virtual specifier shall only be used in declarations of 2217 // nonstatic class member functions that appear within a 2218 // member-specification of a class declaration; see 10.3. 2219 // 2220 if (isVirtual && !NewFD->isInvalidDecl()) { 2221 if (!isVirtualOkay) { 2222 Diag(D.getDeclSpec().getVirtualSpecLoc(), 2223 diag::err_virtual_non_function); 2224 } else if (!CurContext->isRecord()) { 2225 // 'virtual' was specified outside of the class. 2226 Diag(D.getDeclSpec().getVirtualSpecLoc(), diag::err_virtual_out_of_class) 2227 << CodeModificationHint::CreateRemoval( 2228 SourceRange(D.getDeclSpec().getVirtualSpecLoc())); 2229 } else { 2230 // Okay: Add virtual to the method. 2231 cast<CXXMethodDecl>(NewFD)->setVirtualAsWritten(true); 2232 CXXRecordDecl *CurClass = cast<CXXRecordDecl>(DC); 2233 CurClass->setAggregate(false); 2234 CurClass->setPOD(false); 2235 CurClass->setPolymorphic(true); 2236 CurClass->setHasTrivialConstructor(false); 2237 } 2238 } 2239 2240 if (CXXMethodDecl *NewMD = dyn_cast<CXXMethodDecl>(NewFD)) { 2241 // Look for virtual methods in base classes that this method might override. 2242 2243 BasePaths Paths; 2244 if (LookupInBases(cast<CXXRecordDecl>(DC), 2245 MemberLookupCriteria(NewMD), Paths)) { 2246 for (BasePaths::decl_iterator I = Paths.found_decls_begin(), 2247 E = Paths.found_decls_end(); I != E; ++I) { 2248 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) { 2249 if (!CheckOverridingFunctionReturnType(NewMD, OldMD) && 2250 !CheckOverridingFunctionExceptionSpec(NewMD, OldMD)) 2251 NewMD->addOverriddenMethod(OldMD); 2252 } 2253 } 2254 } 2255 } 2256 2257 if (SC == FunctionDecl::Static && isa<CXXMethodDecl>(NewFD) && 2258 !CurContext->isRecord()) { 2259 // C++ [class.static]p1: 2260 // A data or function member of a class may be declared static 2261 // in a class definition, in which case it is a static member of 2262 // the class. 2263 2264 // Complain about the 'static' specifier if it's on an out-of-line 2265 // member function definition. 2266 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2267 diag::err_static_out_of_line) 2268 << CodeModificationHint::CreateRemoval( 2269 SourceRange(D.getDeclSpec().getStorageClassSpecLoc())); 2270 } 2271 2272 // Handle GNU asm-label extension (encoded as an attribute). 2273 if (Expr *E = (Expr*) D.getAsmLabel()) { 2274 // The parser guarantees this is a string. 2275 StringLiteral *SE = cast<StringLiteral>(E); 2276 NewFD->addAttr(::new (Context) AsmLabelAttr(std::string(SE->getStrData(), 2277 SE->getByteLength()))); 2278 } 2279 2280 // Copy the parameter declarations from the declarator D to the function 2281 // declaration NewFD, if they are available. First scavenge them into Params. 2282 llvm::SmallVector<ParmVarDecl*, 16> Params; 2283 if (D.getNumTypeObjects() > 0) { 2284 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2285 2286 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 2287 // function that takes no arguments, not a function that takes a 2288 // single void argument. 2289 // We let through "const void" here because Sema::GetTypeForDeclarator 2290 // already checks for that case. 2291 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 2292 FTI.ArgInfo[0].Param && 2293 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()) { 2294 // Empty arg list, don't push any params. 2295 ParmVarDecl *Param = FTI.ArgInfo[0].Param.getAs<ParmVarDecl>(); 2296 2297 // In C++, the empty parameter-type-list must be spelled "void"; a 2298 // typedef of void is not permitted. 2299 if (getLangOptions().CPlusPlus && 2300 Param->getType().getUnqualifiedType() != Context.VoidTy) 2301 Diag(Param->getLocation(), diag::err_param_typedef_of_void); 2302 // FIXME: Leaks decl? 2303 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 2304 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 2305 ParmVarDecl *Param = FTI.ArgInfo[i].Param.getAs<ParmVarDecl>(); 2306 assert(Param->getDeclContext() != NewFD && "Was set before ?"); 2307 Param->setDeclContext(NewFD); 2308 Params.push_back(Param); 2309 } 2310 } 2311 2312 } else if (const FunctionProtoType *FT = R->getAsFunctionProtoType()) { 2313 // When we're declaring a function with a typedef, typeof, etc as in the 2314 // following example, we'll need to synthesize (unnamed) 2315 // parameters for use in the declaration. 2316 // 2317 // @code 2318 // typedef void fn(int); 2319 // fn f; 2320 // @endcode 2321 2322 // Synthesize a parameter for each argument type. 2323 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 2324 AE = FT->arg_type_end(); AI != AE; ++AI) { 2325 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, 2326 SourceLocation(), 0, 2327 *AI, VarDecl::None, 0); 2328 Param->setImplicit(); 2329 Params.push_back(Param); 2330 } 2331 } else { 2332 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && 2333 "Should not need args for typedef of non-prototype fn"); 2334 } 2335 // Finally, we know we have the right number of parameters, install them. 2336 NewFD->setParams(Context, Params.data(), Params.size()); 2337 2338 // If name lookup finds a previous declaration that is not in the 2339 // same scope as the new declaration, this may still be an 2340 // acceptable redeclaration. 2341 if (PrevDecl && !isDeclInScope(PrevDecl, DC, S) && 2342 !(NewFD->hasLinkage() && 2343 isOutOfScopePreviousDeclaration(PrevDecl, DC, Context))) 2344 PrevDecl = 0; 2345 2346 // Perform semantic checking on the function declaration. 2347 bool OverloadableAttrRequired = false; // FIXME: HACK! 2348 CheckFunctionDeclaration(NewFD, PrevDecl, Redeclaration, 2349 /*FIXME:*/OverloadableAttrRequired); 2350 2351 if (D.getCXXScopeSpec().isSet() && !NewFD->isInvalidDecl()) { 2352 // An out-of-line member function declaration must also be a 2353 // definition (C++ [dcl.meaning]p1). 2354 if (!IsFunctionDefinition) { 2355 Diag(NewFD->getLocation(), diag::err_out_of_line_declaration) 2356 << D.getCXXScopeSpec().getRange(); 2357 NewFD->setInvalidDecl(); 2358 } else if (!Redeclaration && (!PrevDecl || !isa<UsingDecl>(PrevDecl))) { 2359 // The user tried to provide an out-of-line definition for a 2360 // function that is a member of a class or namespace, but there 2361 // was no such member function declared (C++ [class.mfct]p2, 2362 // C++ [namespace.memdef]p2). For example: 2363 // 2364 // class X { 2365 // void f() const; 2366 // }; 2367 // 2368 // void X::f() { } // ill-formed 2369 // 2370 // Complain about this problem, and attempt to suggest close 2371 // matches (e.g., those that differ only in cv-qualifiers and 2372 // whether the parameter types are references). 2373 Diag(D.getIdentifierLoc(), diag::err_member_def_does_not_match) 2374 << cast<NamedDecl>(DC) << D.getCXXScopeSpec().getRange(); 2375 NewFD->setInvalidDecl(); 2376 2377 LookupResult Prev = LookupQualifiedName(DC, Name, LookupOrdinaryName, 2378 true); 2379 assert(!Prev.isAmbiguous() && 2380 "Cannot have an ambiguity in previous-declaration lookup"); 2381 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 2382 Func != FuncEnd; ++Func) { 2383 if (isa<FunctionDecl>(*Func) && 2384 isNearlyMatchingFunction(Context, cast<FunctionDecl>(*Func), NewFD)) 2385 Diag((*Func)->getLocation(), diag::note_member_def_close_match); 2386 } 2387 2388 PrevDecl = 0; 2389 } 2390 } 2391 2392 // Handle attributes. We need to have merged decls when handling attributes 2393 // (for example to check for conflicts, etc). 2394 // FIXME: This needs to happen before we merge declarations. Then, 2395 // let attribute merging cope with attribute conflicts. 2396 ProcessDeclAttributes(S, NewFD, D); 2397 AddKnownFunctionAttributes(NewFD); 2398 2399 if (OverloadableAttrRequired && !NewFD->getAttr<OverloadableAttr>()) { 2400 // If a function name is overloadable in C, then every function 2401 // with that name must be marked "overloadable". 2402 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 2403 << Redeclaration << NewFD; 2404 if (PrevDecl) 2405 Diag(PrevDecl->getLocation(), 2406 diag::note_attribute_overloadable_prev_overload); 2407 NewFD->addAttr(::new (Context) OverloadableAttr()); 2408 } 2409 2410 // If this is a locally-scoped extern C function, update the 2411 // map of such names. 2412 if (CurContext->isFunctionOrMethod() && NewFD->isExternC(Context) 2413 && !NewFD->isInvalidDecl()) 2414 RegisterLocallyScopedExternCDecl(NewFD, PrevDecl, S); 2415 2416 // Set this FunctionDecl's range up to the right paren. 2417 NewFD->setLocEnd(D.getSourceRange().getEnd()); 2418 2419 if (FunctionTemplate && NewFD->isInvalidDecl()) 2420 FunctionTemplate->setInvalidDecl(); 2421 2422 if (FunctionTemplate) 2423 return FunctionTemplate; 2424 2425 return NewFD; 2426} 2427 2428/// \brief Perform semantic checking of a new function declaration. 2429/// 2430/// Performs semantic analysis of the new function declaration 2431/// NewFD. This routine performs all semantic checking that does not 2432/// require the actual declarator involved in the declaration, and is 2433/// used both for the declaration of functions as they are parsed 2434/// (called via ActOnDeclarator) and for the declaration of functions 2435/// that have been instantiated via C++ template instantiation (called 2436/// via InstantiateDecl). 2437/// 2438/// This sets NewFD->isInvalidDecl() to true if there was an error. 2439void Sema::CheckFunctionDeclaration(FunctionDecl *NewFD, NamedDecl *&PrevDecl, 2440 bool &Redeclaration, 2441 bool &OverloadableAttrRequired) { 2442 // If NewFD is already known erroneous, don't do any of this checking. 2443 if (NewFD->isInvalidDecl()) 2444 return; 2445 2446 if (NewFD->getResultType()->isVariablyModifiedType()) { 2447 // Functions returning a variably modified type violate C99 6.7.5.2p2 2448 // because all functions have linkage. 2449 Diag(NewFD->getLocation(), diag::err_vm_func_decl); 2450 return NewFD->setInvalidDecl(); 2451 } 2452 2453 // Semantic checking for this function declaration (in isolation). 2454 if (getLangOptions().CPlusPlus) { 2455 // C++-specific checks. 2456 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { 2457 CheckConstructor(Constructor); 2458 } else if (isa<CXXDestructorDecl>(NewFD)) { 2459 CXXRecordDecl *Record = cast<CXXRecordDecl>(NewFD->getParent()); 2460 QualType ClassType = Context.getTypeDeclType(Record); 2461 if (!ClassType->isDependentType()) { 2462 ClassType = Context.getCanonicalType(ClassType); 2463 DeclarationName Name 2464 = Context.DeclarationNames.getCXXDestructorName(ClassType); 2465 if (NewFD->getDeclName() != Name) { 2466 Diag(NewFD->getLocation(), diag::err_destructor_name); 2467 return NewFD->setInvalidDecl(); 2468 } 2469 } 2470 Record->setUserDeclaredDestructor(true); 2471 // C++ [class]p4: A POD-struct is an aggregate class that has [...] no 2472 // user-defined destructor. 2473 Record->setPOD(false); 2474 2475 // C++ [class.dtor]p3: A destructor is trivial if it is an implicitly- 2476 // declared destructor. 2477 Record->setHasTrivialDestructor(false); 2478 } else if (CXXConversionDecl *Conversion 2479 = dyn_cast<CXXConversionDecl>(NewFD)) 2480 ActOnConversionDeclarator(Conversion); 2481 2482 // Extra checking for C++ overloaded operators (C++ [over.oper]). 2483 if (NewFD->isOverloadedOperator() && 2484 CheckOverloadedOperatorDeclaration(NewFD)) 2485 return NewFD->setInvalidDecl(); 2486 } 2487 2488 // C99 6.7.4p6: 2489 // [... ] For a function with external linkage, the following 2490 // restrictions apply: [...] If all of the file scope declarations 2491 // for a function in a translation unit include the inline 2492 // function specifier without extern, then the definition in that 2493 // translation unit is an inline definition. An inline definition 2494 // does not provide an external definition for the function, and 2495 // does not forbid an external definition in another translation 2496 // unit. 2497 // 2498 // Here we determine whether this function, in isolation, would be a 2499 // C99 inline definition. MergeCompatibleFunctionDecls looks at 2500 // previous declarations. 2501 if (NewFD->isInline() && getLangOptions().C99 && 2502 NewFD->getStorageClass() == FunctionDecl::None && 2503 NewFD->getDeclContext()->getLookupContext()->isTranslationUnit()) 2504 NewFD->setC99InlineDefinition(true); 2505 2506 // Check for a previous declaration of this name. 2507 if (!PrevDecl && NewFD->isExternC(Context)) { 2508 // Since we did not find anything by this name and we're declaring 2509 // an extern "C" function, look for a non-visible extern "C" 2510 // declaration with the same name. 2511 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 2512 = LocallyScopedExternalDecls.find(NewFD->getDeclName()); 2513 if (Pos != LocallyScopedExternalDecls.end()) 2514 PrevDecl = Pos->second; 2515 } 2516 2517 // Merge or overload the declaration with an existing declaration of 2518 // the same name, if appropriate. 2519 if (PrevDecl) { 2520 // Determine whether NewFD is an overload of PrevDecl or 2521 // a declaration that requires merging. If it's an overload, 2522 // there's no more work to do here; we'll just add the new 2523 // function to the scope. 2524 OverloadedFunctionDecl::function_iterator MatchedDecl; 2525 2526 if (!getLangOptions().CPlusPlus && 2527 AllowOverloadingOfFunction(PrevDecl, Context)) { 2528 OverloadableAttrRequired = true; 2529 2530 // Functions marked "overloadable" must have a prototype (that 2531 // we can't get through declaration merging). 2532 if (!NewFD->getType()->getAsFunctionProtoType()) { 2533 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_no_prototype) 2534 << NewFD; 2535 Redeclaration = true; 2536 2537 // Turn this into a variadic function with no parameters. 2538 QualType R = Context.getFunctionType( 2539 NewFD->getType()->getAsFunctionType()->getResultType(), 2540 0, 0, true, 0); 2541 NewFD->setType(R); 2542 return NewFD->setInvalidDecl(); 2543 } 2544 } 2545 2546 if (PrevDecl && 2547 (!AllowOverloadingOfFunction(PrevDecl, Context) || 2548 !IsOverload(NewFD, PrevDecl, MatchedDecl)) && 2549 !isa<UsingDecl>(PrevDecl)) { 2550 Redeclaration = true; 2551 Decl *OldDecl = PrevDecl; 2552 2553 // If PrevDecl was an overloaded function, extract the 2554 // FunctionDecl that matched. 2555 if (isa<OverloadedFunctionDecl>(PrevDecl)) 2556 OldDecl = *MatchedDecl; 2557 2558 // NewFD and OldDecl represent declarations that need to be 2559 // merged. 2560 if (MergeFunctionDecl(NewFD, OldDecl)) 2561 return NewFD->setInvalidDecl(); 2562 2563 if (FunctionTemplateDecl *OldTemplateDecl 2564 = dyn_cast<FunctionTemplateDecl>(OldDecl)) 2565 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl()); 2566 else { 2567 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions 2568 NewFD->setAccess(OldDecl->getAccess()); 2569 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 2570 } 2571 } 2572 } 2573 2574 // In C++, check default arguments now that we have merged decls. Unless 2575 // the lexical context is the class, because in this case this is done 2576 // during delayed parsing anyway. 2577 if (getLangOptions().CPlusPlus && !CurContext->isRecord()) 2578 CheckCXXDefaultArguments(NewFD); 2579} 2580 2581bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 2582 // FIXME: Need strict checking. In C89, we need to check for 2583 // any assignment, increment, decrement, function-calls, or 2584 // commas outside of a sizeof. In C99, it's the same list, 2585 // except that the aforementioned are allowed in unevaluated 2586 // expressions. Everything else falls under the 2587 // "may accept other forms of constant expressions" exception. 2588 // (We never end up here for C++, so the constant expression 2589 // rules there don't matter.) 2590 if (Init->isConstantInitializer(Context)) 2591 return false; 2592 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 2593 << Init->getSourceRange(); 2594 return true; 2595} 2596 2597void Sema::AddInitializerToDecl(DeclPtrTy dcl, FullExprArg init) { 2598 AddInitializerToDecl(dcl, init.release(), /*DirectInit=*/false); 2599} 2600 2601/// AddInitializerToDecl - Adds the initializer Init to the 2602/// declaration dcl. If DirectInit is true, this is C++ direct 2603/// initialization rather than copy initialization. 2604void Sema::AddInitializerToDecl(DeclPtrTy dcl, ExprArg init, bool DirectInit) { 2605 Decl *RealDecl = dcl.getAs<Decl>(); 2606 // If there is no declaration, there was an error parsing it. Just ignore 2607 // the initializer. 2608 if (RealDecl == 0) 2609 return; 2610 2611 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 2612 // With declarators parsed the way they are, the parser cannot 2613 // distinguish between a normal initializer and a pure-specifier. 2614 // Thus this grotesque test. 2615 IntegerLiteral *IL; 2616 Expr *Init = static_cast<Expr *>(init.get()); 2617 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 2618 Context.getCanonicalType(IL->getType()) == Context.IntTy) { 2619 if (Method->isVirtualAsWritten()) { 2620 Method->setPure(); 2621 2622 // A class is abstract if at least one function is pure virtual. 2623 cast<CXXRecordDecl>(CurContext)->setAbstract(true); 2624 } else if (!Method->isInvalidDecl()) { 2625 Diag(Method->getLocation(), diag::err_non_virtual_pure) 2626 << Method->getDeclName() << Init->getSourceRange(); 2627 Method->setInvalidDecl(); 2628 } 2629 } else { 2630 Diag(Method->getLocation(), diag::err_member_function_initialization) 2631 << Method->getDeclName() << Init->getSourceRange(); 2632 Method->setInvalidDecl(); 2633 } 2634 return; 2635 } 2636 2637 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 2638 if (!VDecl) { 2639 if (getLangOptions().CPlusPlus && 2640 RealDecl->getLexicalDeclContext()->isRecord() && 2641 isa<NamedDecl>(RealDecl)) 2642 Diag(RealDecl->getLocation(), diag::err_member_initialization) 2643 << cast<NamedDecl>(RealDecl)->getDeclName(); 2644 else 2645 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 2646 RealDecl->setInvalidDecl(); 2647 return; 2648 } 2649 2650 if (!VDecl->getType()->isArrayType() && 2651 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 2652 diag::err_typecheck_decl_incomplete_type)) { 2653 RealDecl->setInvalidDecl(); 2654 return; 2655 } 2656 2657 const VarDecl *Def = 0; 2658 if (VDecl->getDefinition(Def)) { 2659 Diag(VDecl->getLocation(), diag::err_redefinition) 2660 << VDecl->getDeclName(); 2661 Diag(Def->getLocation(), diag::note_previous_definition); 2662 VDecl->setInvalidDecl(); 2663 return; 2664 } 2665 2666 // Take ownership of the expression, now that we're sure we have somewhere 2667 // to put it. 2668 Expr *Init = init.takeAs<Expr>(); 2669 assert(Init && "missing initializer"); 2670 2671 // Get the decls type and save a reference for later, since 2672 // CheckInitializerTypes may change it. 2673 QualType DclT = VDecl->getType(), SavT = DclT; 2674 if (VDecl->isBlockVarDecl()) { 2675 if (VDecl->hasExternalStorage()) { // C99 6.7.8p5 2676 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 2677 VDecl->setInvalidDecl(); 2678 } else if (!VDecl->isInvalidDecl()) { 2679 if (CheckInitializerTypes(Init, DclT, VDecl->getLocation(), 2680 VDecl->getDeclName(), DirectInit)) 2681 VDecl->setInvalidDecl(); 2682 2683 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 2684 // Don't check invalid declarations to avoid emitting useless diagnostics. 2685 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 2686 if (VDecl->getStorageClass() == VarDecl::Static) // C99 6.7.8p4. 2687 CheckForConstantInitializer(Init, DclT); 2688 } 2689 } 2690 } else if (VDecl->isStaticDataMember() && 2691 VDecl->getLexicalDeclContext()->isRecord()) { 2692 // This is an in-class initialization for a static data member, e.g., 2693 // 2694 // struct S { 2695 // static const int value = 17; 2696 // }; 2697 2698 // Attach the initializer 2699 VDecl->setInit(Context, Init); 2700 2701 // C++ [class.mem]p4: 2702 // A member-declarator can contain a constant-initializer only 2703 // if it declares a static member (9.4) of const integral or 2704 // const enumeration type, see 9.4.2. 2705 QualType T = VDecl->getType(); 2706 if (!T->isDependentType() && 2707 (!Context.getCanonicalType(T).isConstQualified() || 2708 !T->isIntegralType())) { 2709 Diag(VDecl->getLocation(), diag::err_member_initialization) 2710 << VDecl->getDeclName() << Init->getSourceRange(); 2711 VDecl->setInvalidDecl(); 2712 } else { 2713 // C++ [class.static.data]p4: 2714 // If a static data member is of const integral or const 2715 // enumeration type, its declaration in the class definition 2716 // can specify a constant-initializer which shall be an 2717 // integral constant expression (5.19). 2718 if (!Init->isTypeDependent() && 2719 !Init->getType()->isIntegralType()) { 2720 // We have a non-dependent, non-integral or enumeration type. 2721 Diag(Init->getSourceRange().getBegin(), 2722 diag::err_in_class_initializer_non_integral_type) 2723 << Init->getType() << Init->getSourceRange(); 2724 VDecl->setInvalidDecl(); 2725 } else if (!Init->isTypeDependent() && !Init->isValueDependent()) { 2726 // Check whether the expression is a constant expression. 2727 llvm::APSInt Value; 2728 SourceLocation Loc; 2729 if (!Init->isIntegerConstantExpr(Value, Context, &Loc)) { 2730 Diag(Loc, diag::err_in_class_initializer_non_constant) 2731 << Init->getSourceRange(); 2732 VDecl->setInvalidDecl(); 2733 } else if (!VDecl->getType()->isDependentType()) 2734 ImpCastExprToType(Init, VDecl->getType()); 2735 } 2736 } 2737 } else if (VDecl->isFileVarDecl()) { 2738 if (VDecl->getStorageClass() == VarDecl::Extern) 2739 Diag(VDecl->getLocation(), diag::warn_extern_init); 2740 if (!VDecl->isInvalidDecl()) 2741 if (CheckInitializerTypes(Init, DclT, VDecl->getLocation(), 2742 VDecl->getDeclName(), DirectInit)) 2743 VDecl->setInvalidDecl(); 2744 2745 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 2746 // Don't check invalid declarations to avoid emitting useless diagnostics. 2747 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 2748 // C99 6.7.8p4. All file scoped initializers need to be constant. 2749 CheckForConstantInitializer(Init, DclT); 2750 } 2751 } 2752 // If the type changed, it means we had an incomplete type that was 2753 // completed by the initializer. For example: 2754 // int ary[] = { 1, 3, 5 }; 2755 // "ary" transitions from a VariableArrayType to a ConstantArrayType. 2756 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 2757 VDecl->setType(DclT); 2758 Init->setType(DclT); 2759 } 2760 2761 // Attach the initializer to the decl. 2762 VDecl->setInit(Context, Init); 2763 2764 // If the previous declaration of VDecl was a tentative definition, 2765 // remove it from the set of tentative definitions. 2766 if (VDecl->getPreviousDeclaration() && 2767 VDecl->getPreviousDeclaration()->isTentativeDefinition(Context)) { 2768 llvm::DenseMap<DeclarationName, VarDecl *>::iterator Pos 2769 = TentativeDefinitions.find(VDecl->getDeclName()); 2770 assert(Pos != TentativeDefinitions.end() && 2771 "Unrecorded tentative definition?"); 2772 TentativeDefinitions.erase(Pos); 2773 } 2774 2775 return; 2776} 2777 2778void Sema::ActOnUninitializedDecl(DeclPtrTy dcl, 2779 bool TypeContainsUndeducedAuto) { 2780 Decl *RealDecl = dcl.getAs<Decl>(); 2781 2782 // If there is no declaration, there was an error parsing it. Just ignore it. 2783 if (RealDecl == 0) 2784 return; 2785 2786 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 2787 QualType Type = Var->getType(); 2788 2789 // Record tentative definitions. 2790 if (Var->isTentativeDefinition(Context)) 2791 TentativeDefinitions[Var->getDeclName()] = Var; 2792 2793 // C++ [dcl.init.ref]p3: 2794 // The initializer can be omitted for a reference only in a 2795 // parameter declaration (8.3.5), in the declaration of a 2796 // function return type, in the declaration of a class member 2797 // within its class declaration (9.2), and where the extern 2798 // specifier is explicitly used. 2799 if (Type->isReferenceType() && !Var->hasExternalStorage()) { 2800 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 2801 << Var->getDeclName() 2802 << SourceRange(Var->getLocation(), Var->getLocation()); 2803 Var->setInvalidDecl(); 2804 return; 2805 } 2806 2807 // C++0x [dcl.spec.auto]p3 2808 if (TypeContainsUndeducedAuto) { 2809 Diag(Var->getLocation(), diag::err_auto_var_requires_init) 2810 << Var->getDeclName() << Type; 2811 Var->setInvalidDecl(); 2812 return; 2813 } 2814 2815 // C++ [dcl.init]p9: 2816 // 2817 // If no initializer is specified for an object, and the object 2818 // is of (possibly cv-qualified) non-POD class type (or array 2819 // thereof), the object shall be default-initialized; if the 2820 // object is of const-qualified type, the underlying class type 2821 // shall have a user-declared default constructor. 2822 if (getLangOptions().CPlusPlus) { 2823 QualType InitType = Type; 2824 if (const ArrayType *Array = Context.getAsArrayType(Type)) 2825 InitType = Array->getElementType(); 2826 if ((!Var->hasExternalStorage() && !Var->isExternC(Context)) && 2827 InitType->isRecordType() && !InitType->isDependentType()) { 2828 CXXRecordDecl *RD = 2829 cast<CXXRecordDecl>(InitType->getAsRecordType()->getDecl()); 2830 CXXConstructorDecl *Constructor = 0; 2831 if (!RequireCompleteType(Var->getLocation(), InitType, 2832 diag::err_invalid_incomplete_type_use)) 2833 Constructor 2834 = PerformInitializationByConstructor(InitType, 0, 0, 2835 Var->getLocation(), 2836 SourceRange(Var->getLocation(), 2837 Var->getLocation()), 2838 Var->getDeclName(), 2839 IK_Default); 2840 if (!Constructor) 2841 Var->setInvalidDecl(); 2842 else { 2843 if (!RD->hasTrivialConstructor()) 2844 InitializeVarWithConstructor(Var, Constructor, InitType, 0, 0); 2845 // FIXME. Must do all that is needed to destroy the object 2846 // on scope exit. For now, just mark the destructor as used. 2847 MarkDestructorReferenced(Var->getLocation(), InitType); 2848 } 2849 } 2850 } 2851 2852#if 0 2853 // FIXME: Temporarily disabled because we are not properly parsing 2854 // linkage specifications on declarations, e.g., 2855 // 2856 // extern "C" const CGPoint CGPointerZero; 2857 // 2858 // C++ [dcl.init]p9: 2859 // 2860 // If no initializer is specified for an object, and the 2861 // object is of (possibly cv-qualified) non-POD class type (or 2862 // array thereof), the object shall be default-initialized; if 2863 // the object is of const-qualified type, the underlying class 2864 // type shall have a user-declared default 2865 // constructor. Otherwise, if no initializer is specified for 2866 // an object, the object and its subobjects, if any, have an 2867 // indeterminate initial value; if the object or any of its 2868 // subobjects are of const-qualified type, the program is 2869 // ill-formed. 2870 // 2871 // This isn't technically an error in C, so we don't diagnose it. 2872 // 2873 // FIXME: Actually perform the POD/user-defined default 2874 // constructor check. 2875 if (getLangOptions().CPlusPlus && 2876 Context.getCanonicalType(Type).isConstQualified() && 2877 !Var->hasExternalStorage()) 2878 Diag(Var->getLocation(), diag::err_const_var_requires_init) 2879 << Var->getName() 2880 << SourceRange(Var->getLocation(), Var->getLocation()); 2881#endif 2882 } 2883} 2884 2885Sema::DeclGroupPtrTy Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, 2886 DeclPtrTy *Group, 2887 unsigned NumDecls) { 2888 llvm::SmallVector<Decl*, 8> Decls; 2889 2890 if (DS.isTypeSpecOwned()) 2891 Decls.push_back((Decl*)DS.getTypeRep()); 2892 2893 for (unsigned i = 0; i != NumDecls; ++i) 2894 if (Decl *D = Group[i].getAs<Decl>()) 2895 Decls.push_back(D); 2896 2897 // Perform semantic analysis that depends on having fully processed both 2898 // the declarator and initializer. 2899 for (unsigned i = 0, e = Decls.size(); i != e; ++i) { 2900 VarDecl *IDecl = dyn_cast<VarDecl>(Decls[i]); 2901 if (!IDecl) 2902 continue; 2903 QualType T = IDecl->getType(); 2904 2905 // Block scope. C99 6.7p7: If an identifier for an object is declared with 2906 // no linkage (C99 6.2.2p6), the type for the object shall be complete... 2907 if (IDecl->isBlockVarDecl() && !IDecl->hasExternalStorage()) { 2908 if (!IDecl->isInvalidDecl() && 2909 RequireCompleteType(IDecl->getLocation(), T, 2910 diag::err_typecheck_decl_incomplete_type)) 2911 IDecl->setInvalidDecl(); 2912 } 2913 // File scope. C99 6.9.2p2: A declaration of an identifier for an 2914 // object that has file scope without an initializer, and without a 2915 // storage-class specifier or with the storage-class specifier "static", 2916 // constitutes a tentative definition. Note: A tentative definition with 2917 // external linkage is valid (C99 6.2.2p5). 2918 if (IDecl->isTentativeDefinition(Context) && !IDecl->isInvalidDecl()) { 2919 if (const IncompleteArrayType *ArrayT 2920 = Context.getAsIncompleteArrayType(T)) { 2921 if (RequireCompleteType(IDecl->getLocation(), 2922 ArrayT->getElementType(), 2923 diag::err_illegal_decl_array_incomplete_type)) 2924 IDecl->setInvalidDecl(); 2925 } 2926 else if (IDecl->getStorageClass() == VarDecl::Static) { 2927 // C99 6.9.2p3: If the declaration of an identifier for an object is 2928 // a tentative definition and has internal linkage (C99 6.2.2p3), the 2929 // declared type shall not be an incomplete type. 2930 // NOTE: code such as the following 2931 // static struct s; 2932 // struct s { int a; }; 2933 // is accepted by gcc. Hence here we issue a warning instead of 2934 // an error and we do not invalidate the static declaration. 2935 // NOTE: to avoid multiple warnings, only check the first declaration. 2936 if (IDecl->getPreviousDeclaration() == 0) 2937 RequireCompleteType(IDecl->getLocation(), T, 2938 diag::ext_typecheck_decl_incomplete_type); 2939 } 2940 } 2941 } 2942 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, 2943 Decls.data(), Decls.size())); 2944} 2945 2946 2947/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 2948/// to introduce parameters into function prototype scope. 2949Sema::DeclPtrTy 2950Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 2951 const DeclSpec &DS = D.getDeclSpec(); 2952 2953 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 2954 VarDecl::StorageClass StorageClass = VarDecl::None; 2955 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 2956 StorageClass = VarDecl::Register; 2957 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 2958 Diag(DS.getStorageClassSpecLoc(), 2959 diag::err_invalid_storage_class_in_func_decl); 2960 D.getMutableDeclSpec().ClearStorageClassSpecs(); 2961 } 2962 2963 if (D.getDeclSpec().isThreadSpecified()) 2964 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 2965 2966 DiagnoseFunctionSpecifiers(D); 2967 2968 // Check that there are no default arguments inside the type of this 2969 // parameter (C++ only). 2970 if (getLangOptions().CPlusPlus) 2971 CheckExtraCXXDefaultArguments(D); 2972 2973 TagDecl *OwnedDecl = 0; 2974 QualType parmDeclType = GetTypeForDeclarator(D, S, /*Skip=*/0, &OwnedDecl); 2975 2976 if (getLangOptions().CPlusPlus && OwnedDecl && OwnedDecl->isDefinition()) { 2977 // C++ [dcl.fct]p6: 2978 // Types shall not be defined in return or parameter types. 2979 Diag(OwnedDecl->getLocation(), diag::err_type_defined_in_param_type) 2980 << Context.getTypeDeclType(OwnedDecl); 2981 } 2982 2983 // TODO: CHECK FOR CONFLICTS, multiple decls with same name in one scope. 2984 // Can this happen for params? We already checked that they don't conflict 2985 // among each other. Here they can only shadow globals, which is ok. 2986 IdentifierInfo *II = D.getIdentifier(); 2987 if (II) { 2988 if (NamedDecl *PrevDecl = LookupName(S, II, LookupOrdinaryName)) { 2989 if (PrevDecl->isTemplateParameter()) { 2990 // Maybe we will complain about the shadowed template parameter. 2991 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 2992 // Just pretend that we didn't see the previous declaration. 2993 PrevDecl = 0; 2994 } else if (S->isDeclScope(DeclPtrTy::make(PrevDecl))) { 2995 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 2996 2997 // Recover by removing the name 2998 II = 0; 2999 D.SetIdentifier(0, D.getIdentifierLoc()); 3000 } 3001 } 3002 } 3003 3004 // Parameters can not be abstract class types. 3005 // For record types, this is done by the AbstractClassUsageDiagnoser once 3006 // the class has been completely parsed. 3007 if (!CurContext->isRecord() && 3008 RequireNonAbstractType(D.getIdentifierLoc(), parmDeclType, 3009 diag::err_abstract_type_in_decl, 3010 AbstractParamType)) 3011 D.setInvalidType(true); 3012 3013 QualType T = adjustParameterType(parmDeclType); 3014 3015 ParmVarDecl *New; 3016 if (T == parmDeclType) // parameter type did not need adjustment 3017 New = ParmVarDecl::Create(Context, CurContext, 3018 D.getIdentifierLoc(), II, 3019 parmDeclType, StorageClass, 3020 0); 3021 else // keep track of both the adjusted and unadjusted types 3022 New = OriginalParmVarDecl::Create(Context, CurContext, 3023 D.getIdentifierLoc(), II, T, 3024 parmDeclType, StorageClass, 0); 3025 3026 if (D.isInvalidType()) 3027 New->setInvalidDecl(); 3028 3029 // Parameter declarators cannot be interface types. All ObjC objects are 3030 // passed by reference. 3031 if (T->isObjCInterfaceType()) { 3032 Diag(D.getIdentifierLoc(), 3033 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T; 3034 New->setInvalidDecl(); 3035 } 3036 3037 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 3038 if (D.getCXXScopeSpec().isSet()) { 3039 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 3040 << D.getCXXScopeSpec().getRange(); 3041 New->setInvalidDecl(); 3042 } 3043 3044 // Add the parameter declaration into this scope. 3045 S->AddDecl(DeclPtrTy::make(New)); 3046 if (II) 3047 IdResolver.AddDecl(New); 3048 3049 ProcessDeclAttributes(S, New, D); 3050 3051 if (New->hasAttr<BlocksAttr>()) { 3052 Diag(New->getLocation(), diag::err_block_on_nonlocal); 3053 } 3054 return DeclPtrTy::make(New); 3055} 3056 3057void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 3058 SourceLocation LocAfterDecls) { 3059 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 3060 "Not a function declarator!"); 3061 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 3062 3063 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 3064 // for a K&R function. 3065 if (!FTI.hasPrototype) { 3066 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 3067 --i; 3068 if (FTI.ArgInfo[i].Param == 0) { 3069 std::string Code = " int "; 3070 Code += FTI.ArgInfo[i].Ident->getName(); 3071 Code += ";\n"; 3072 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 3073 << FTI.ArgInfo[i].Ident 3074 << CodeModificationHint::CreateInsertion(LocAfterDecls, Code); 3075 3076 // Implicitly declare the argument as type 'int' for lack of a better 3077 // type. 3078 DeclSpec DS; 3079 const char* PrevSpec; // unused 3080 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 3081 PrevSpec); 3082 Declarator ParamD(DS, Declarator::KNRTypeListContext); 3083 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 3084 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 3085 } 3086 } 3087 } 3088} 3089 3090Sema::DeclPtrTy Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, 3091 Declarator &D) { 3092 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 3093 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 3094 "Not a function declarator!"); 3095 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 3096 3097 if (FTI.hasPrototype) { 3098 // FIXME: Diagnose arguments without names in C. 3099 } 3100 3101 Scope *ParentScope = FnBodyScope->getParent(); 3102 3103 DeclPtrTy DP = HandleDeclarator(ParentScope, D, 3104 MultiTemplateParamsArg(*this), 3105 /*IsFunctionDefinition=*/true); 3106 return ActOnStartOfFunctionDef(FnBodyScope, DP); 3107} 3108 3109Sema::DeclPtrTy Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, DeclPtrTy D) { 3110 if (!D) 3111 return D; 3112 FunctionDecl *FD = cast<FunctionDecl>(D.getAs<Decl>()); 3113 3114 CurFunctionNeedsScopeChecking = false; 3115 3116 // See if this is a redefinition. 3117 const FunctionDecl *Definition; 3118 if (FD->getBody(Definition)) { 3119 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 3120 Diag(Definition->getLocation(), diag::note_previous_definition); 3121 } 3122 3123 // Builtin functions cannot be defined. 3124 if (unsigned BuiltinID = FD->getBuiltinID(Context)) { 3125 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 3126 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 3127 FD->setInvalidDecl(); 3128 } 3129 } 3130 3131 // The return type of a function definition must be complete 3132 // (C99 6.9.1p3, C++ [dcl.fct]p6). 3133 QualType ResultType = FD->getResultType(); 3134 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 3135 !FD->isInvalidDecl() && 3136 RequireCompleteType(FD->getLocation(), ResultType, 3137 diag::err_func_def_incomplete_result)) 3138 FD->setInvalidDecl(); 3139 3140 // GNU warning -Wmissing-prototypes: 3141 // Warn if a global function is defined without a previous 3142 // prototype declaration. This warning is issued even if the 3143 // definition itself provides a prototype. The aim is to detect 3144 // global functions that fail to be declared in header files. 3145 if (!FD->isInvalidDecl() && FD->isGlobal() && !isa<CXXMethodDecl>(FD) && 3146 !FD->isMain()) { 3147 bool MissingPrototype = true; 3148 for (const FunctionDecl *Prev = FD->getPreviousDeclaration(); 3149 Prev; Prev = Prev->getPreviousDeclaration()) { 3150 // Ignore any declarations that occur in function or method 3151 // scope, because they aren't visible from the header. 3152 if (Prev->getDeclContext()->isFunctionOrMethod()) 3153 continue; 3154 3155 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 3156 break; 3157 } 3158 3159 if (MissingPrototype) 3160 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 3161 } 3162 3163 if (FnBodyScope) 3164 PushDeclContext(FnBodyScope, FD); 3165 3166 // Check the validity of our function parameters 3167 CheckParmsForFunctionDef(FD); 3168 3169 // Introduce our parameters into the function scope 3170 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 3171 ParmVarDecl *Param = FD->getParamDecl(p); 3172 Param->setOwningFunction(FD); 3173 3174 // If this has an identifier, add it to the scope stack. 3175 if (Param->getIdentifier() && FnBodyScope) 3176 PushOnScopeChains(Param, FnBodyScope); 3177 } 3178 3179 // Checking attributes of current function definition 3180 // dllimport attribute. 3181 if (FD->getAttr<DLLImportAttr>() && 3182 (!FD->getAttr<DLLExportAttr>())) { 3183 // dllimport attribute cannot be applied to definition. 3184 if (!(FD->getAttr<DLLImportAttr>())->isInherited()) { 3185 Diag(FD->getLocation(), 3186 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 3187 << "dllimport"; 3188 FD->setInvalidDecl(); 3189 return DeclPtrTy::make(FD); 3190 } else { 3191 // If a symbol previously declared dllimport is later defined, the 3192 // attribute is ignored in subsequent references, and a warning is 3193 // emitted. 3194 Diag(FD->getLocation(), 3195 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 3196 << FD->getNameAsCString() << "dllimport"; 3197 } 3198 } 3199 return DeclPtrTy::make(FD); 3200} 3201 3202Sema::DeclPtrTy Sema::ActOnFinishFunctionBody(DeclPtrTy D, StmtArg BodyArg) { 3203 return ActOnFinishFunctionBody(D, move(BodyArg), false); 3204} 3205 3206Sema::DeclPtrTy Sema::ActOnFinishFunctionBody(DeclPtrTy D, StmtArg BodyArg, 3207 bool IsInstantiation) { 3208 Decl *dcl = D.getAs<Decl>(); 3209 Stmt *Body = BodyArg.takeAs<Stmt>(); 3210 if (FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(dcl)) { 3211 FD->setBody(Body); 3212 3213 if (!FD->isInvalidDecl()) 3214 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end()); 3215 3216 // C++ [basic.def.odr]p2: 3217 // [...] A virtual member function is used if it is not pure. [...] 3218 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FD)) 3219 if (Method->isVirtual() && !Method->isPure()) 3220 MarkDeclarationReferenced(Method->getLocation(), Method); 3221 3222 assert(FD == getCurFunctionDecl() && "Function parsing confused"); 3223 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 3224 assert(MD == getCurMethodDecl() && "Method parsing confused"); 3225 MD->setBody(Body); 3226 MD->setEndLoc(Body->getLocEnd()); 3227 3228 if (!MD->isInvalidDecl()) 3229 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end()); 3230 } else { 3231 Body->Destroy(Context); 3232 return DeclPtrTy(); 3233 } 3234 if (!IsInstantiation) 3235 PopDeclContext(); 3236 3237 // Verify and clean out per-function state. 3238 3239 assert(&getLabelMap() == &FunctionLabelMap && "Didn't pop block right?"); 3240 3241 // Check goto/label use. 3242 for (llvm::DenseMap<IdentifierInfo*, LabelStmt*>::iterator 3243 I = FunctionLabelMap.begin(), E = FunctionLabelMap.end(); I != E; ++I) { 3244 LabelStmt *L = I->second; 3245 3246 // Verify that we have no forward references left. If so, there was a goto 3247 // or address of a label taken, but no definition of it. Label fwd 3248 // definitions are indicated with a null substmt. 3249 if (L->getSubStmt() != 0) 3250 continue; 3251 3252 // Emit error. 3253 Diag(L->getIdentLoc(), diag::err_undeclared_label_use) << L->getName(); 3254 3255 // At this point, we have gotos that use the bogus label. Stitch it into 3256 // the function body so that they aren't leaked and that the AST is well 3257 // formed. 3258 if (Body == 0) { 3259 // The whole function wasn't parsed correctly, just delete this. 3260 L->Destroy(Context); 3261 continue; 3262 } 3263 3264 // Otherwise, the body is valid: we want to stitch the label decl into the 3265 // function somewhere so that it is properly owned and so that the goto 3266 // has a valid target. Do this by creating a new compound stmt with the 3267 // label in it. 3268 3269 // Give the label a sub-statement. 3270 L->setSubStmt(new (Context) NullStmt(L->getIdentLoc())); 3271 3272 CompoundStmt *Compound = isa<CXXTryStmt>(Body) ? 3273 cast<CXXTryStmt>(Body)->getTryBlock() : 3274 cast<CompoundStmt>(Body); 3275 std::vector<Stmt*> Elements(Compound->body_begin(), Compound->body_end()); 3276 Elements.push_back(L); 3277 Compound->setStmts(Context, &Elements[0], Elements.size()); 3278 } 3279 FunctionLabelMap.clear(); 3280 3281 if (!Body) return D; 3282 3283 // Verify that that gotos and switch cases don't jump into scopes illegally. 3284 if (CurFunctionNeedsScopeChecking) 3285 DiagnoseInvalidJumps(Body); 3286 3287 // C++ constructors that have function-try-blocks can't have return 3288 // statements in the handlers of that block. (C++ [except.handle]p14) 3289 // Verify this. 3290 if (isa<CXXConstructorDecl>(dcl) && isa<CXXTryStmt>(Body)) 3291 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); 3292 3293 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) 3294 Destructor->computeBaseOrMembersToDestroy(Context); 3295 return D; 3296} 3297 3298/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 3299/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 3300NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 3301 IdentifierInfo &II, Scope *S) { 3302 // Before we produce a declaration for an implicitly defined 3303 // function, see whether there was a locally-scoped declaration of 3304 // this name as a function or variable. If so, use that 3305 // (non-visible) declaration, and complain about it. 3306 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3307 = LocallyScopedExternalDecls.find(&II); 3308 if (Pos != LocallyScopedExternalDecls.end()) { 3309 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 3310 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 3311 return Pos->second; 3312 } 3313 3314 // Extension in C99. Legal in C90, but warn about it. 3315 if (getLangOptions().C99) 3316 Diag(Loc, diag::ext_implicit_function_decl) << &II; 3317 else 3318 Diag(Loc, diag::warn_implicit_function_decl) << &II; 3319 3320 // FIXME: handle stuff like: 3321 // void foo() { extern float X(); } 3322 // void bar() { X(); } <-- implicit decl for X in another scope. 3323 3324 // Set a Declarator for the implicit definition: int foo(); 3325 const char *Dummy; 3326 DeclSpec DS; 3327 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy); 3328 Error = Error; // Silence warning. 3329 assert(!Error && "Error setting up implicit decl!"); 3330 Declarator D(DS, Declarator::BlockContext); 3331 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0, 3332 0, 0, false, SourceLocation(), 3333 false, 0,0,0, Loc, D), 3334 SourceLocation()); 3335 D.SetIdentifier(&II, Loc); 3336 3337 // Insert this function into translation-unit scope. 3338 3339 DeclContext *PrevDC = CurContext; 3340 CurContext = Context.getTranslationUnitDecl(); 3341 3342 FunctionDecl *FD = 3343 dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D).getAs<Decl>()); 3344 FD->setImplicit(); 3345 3346 CurContext = PrevDC; 3347 3348 AddKnownFunctionAttributes(FD); 3349 3350 return FD; 3351} 3352 3353/// \brief Adds any function attributes that we know a priori based on 3354/// the declaration of this function. 3355/// 3356/// These attributes can apply both to implicitly-declared builtins 3357/// (like __builtin___printf_chk) or to library-declared functions 3358/// like NSLog or printf. 3359void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 3360 if (FD->isInvalidDecl()) 3361 return; 3362 3363 // If this is a built-in function, map its builtin attributes to 3364 // actual attributes. 3365 if (unsigned BuiltinID = FD->getBuiltinID(Context)) { 3366 // Handle printf-formatting attributes. 3367 unsigned FormatIdx; 3368 bool HasVAListArg; 3369 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 3370 if (!FD->getAttr<FormatAttr>()) 3371 FD->addAttr(::new (Context) FormatAttr("printf", FormatIdx + 1, 3372 HasVAListArg ? 0 : FormatIdx + 2)); 3373 } 3374 3375 // Mark const if we don't care about errno and that is the only 3376 // thing preventing the function from being const. This allows 3377 // IRgen to use LLVM intrinsics for such functions. 3378 if (!getLangOptions().MathErrno && 3379 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 3380 if (!FD->getAttr<ConstAttr>()) 3381 FD->addAttr(::new (Context) ConstAttr()); 3382 } 3383 } 3384 3385 IdentifierInfo *Name = FD->getIdentifier(); 3386 if (!Name) 3387 return; 3388 if ((!getLangOptions().CPlusPlus && 3389 FD->getDeclContext()->isTranslationUnit()) || 3390 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 3391 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 3392 LinkageSpecDecl::lang_c)) { 3393 // Okay: this could be a libc/libm/Objective-C function we know 3394 // about. 3395 } else 3396 return; 3397 3398 if (Name->isStr("NSLog") || Name->isStr("NSLogv")) { 3399 if (const FormatAttr *Format = FD->getAttr<FormatAttr>()) { 3400 // FIXME: We known better than our headers. 3401 const_cast<FormatAttr *>(Format)->setType("printf"); 3402 } else 3403 FD->addAttr(::new (Context) FormatAttr("printf", 1, 3404 Name->isStr("NSLogv") ? 0 : 2)); 3405 } else if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { 3406 if (!FD->getAttr<FormatAttr>()) 3407 FD->addAttr(::new (Context) FormatAttr("printf", 2, 3408 Name->isStr("vasprintf") ? 0 : 3)); 3409 } 3410} 3411 3412TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T) { 3413 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 3414 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 3415 3416 // Scope manipulation handled by caller. 3417 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 3418 D.getIdentifierLoc(), 3419 D.getIdentifier(), 3420 T); 3421 3422 if (TagType *TT = dyn_cast<TagType>(T)) { 3423 TagDecl *TD = TT->getDecl(); 3424 3425 // If the TagDecl that the TypedefDecl points to is an anonymous decl 3426 // keep track of the TypedefDecl. 3427 if (!TD->getIdentifier() && !TD->getTypedefForAnonDecl()) 3428 TD->setTypedefForAnonDecl(NewTD); 3429 } 3430 3431 if (D.isInvalidType()) 3432 NewTD->setInvalidDecl(); 3433 return NewTD; 3434} 3435 3436 3437/// \brief Determine whether a tag with a given kind is acceptable 3438/// as a redeclaration of the given tag declaration. 3439/// 3440/// \returns true if the new tag kind is acceptable, false otherwise. 3441bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, 3442 TagDecl::TagKind NewTag, 3443 SourceLocation NewTagLoc, 3444 const IdentifierInfo &Name) { 3445 // C++ [dcl.type.elab]p3: 3446 // The class-key or enum keyword present in the 3447 // elaborated-type-specifier shall agree in kind with the 3448 // declaration to which the name in theelaborated-type-specifier 3449 // refers. This rule also applies to the form of 3450 // elaborated-type-specifier that declares a class-name or 3451 // friend class since it can be construed as referring to the 3452 // definition of the class. Thus, in any 3453 // elaborated-type-specifier, the enum keyword shall be used to 3454 // refer to an enumeration (7.2), the union class-keyshall be 3455 // used to refer to a union (clause 9), and either the class or 3456 // struct class-key shall be used to refer to a class (clause 9) 3457 // declared using the class or struct class-key. 3458 TagDecl::TagKind OldTag = Previous->getTagKind(); 3459 if (OldTag == NewTag) 3460 return true; 3461 3462 if ((OldTag == TagDecl::TK_struct || OldTag == TagDecl::TK_class) && 3463 (NewTag == TagDecl::TK_struct || NewTag == TagDecl::TK_class)) { 3464 // Warn about the struct/class tag mismatch. 3465 bool isTemplate = false; 3466 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) 3467 isTemplate = Record->getDescribedClassTemplate(); 3468 3469 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 3470 << (NewTag == TagDecl::TK_class) 3471 << isTemplate << &Name 3472 << CodeModificationHint::CreateReplacement(SourceRange(NewTagLoc), 3473 OldTag == TagDecl::TK_class? "class" : "struct"); 3474 Diag(Previous->getLocation(), diag::note_previous_use); 3475 return true; 3476 } 3477 return false; 3478} 3479 3480/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 3481/// former case, Name will be non-null. In the later case, Name will be null. 3482/// TagSpec indicates what kind of tag this is. TK indicates whether this is a 3483/// reference/declaration/definition of a tag. 3484Sema::DeclPtrTy Sema::ActOnTag(Scope *S, unsigned TagSpec, TagKind TK, 3485 SourceLocation KWLoc, const CXXScopeSpec &SS, 3486 IdentifierInfo *Name, SourceLocation NameLoc, 3487 AttributeList *Attr, AccessSpecifier AS, 3488 bool &OwnedDecl) { 3489 // If this is not a definition, it must have a name. 3490 assert((Name != 0 || TK == TK_Definition) && 3491 "Nameless record must be a definition!"); 3492 3493 OwnedDecl = false; 3494 TagDecl::TagKind Kind; 3495 switch (TagSpec) { 3496 default: assert(0 && "Unknown tag type!"); 3497 case DeclSpec::TST_struct: Kind = TagDecl::TK_struct; break; 3498 case DeclSpec::TST_union: Kind = TagDecl::TK_union; break; 3499 case DeclSpec::TST_class: Kind = TagDecl::TK_class; break; 3500 case DeclSpec::TST_enum: Kind = TagDecl::TK_enum; break; 3501 } 3502 3503 DeclContext *SearchDC = CurContext; 3504 DeclContext *DC = CurContext; 3505 NamedDecl *PrevDecl = 0; 3506 3507 bool Invalid = false; 3508 3509 if (Name && SS.isNotEmpty()) { 3510 // We have a nested-name tag ('struct foo::bar'). 3511 3512 // Check for invalid 'foo::'. 3513 if (SS.isInvalid()) { 3514 Name = 0; 3515 goto CreateNewDecl; 3516 } 3517 3518 if (RequireCompleteDeclContext(SS)) 3519 return DeclPtrTy::make((Decl *)0); 3520 3521 DC = computeDeclContext(SS, true); 3522 SearchDC = DC; 3523 // Look-up name inside 'foo::'. 3524 PrevDecl 3525 = dyn_cast_or_null<TagDecl>( 3526 LookupQualifiedName(DC, Name, LookupTagName, true).getAsDecl()); 3527 3528 // A tag 'foo::bar' must already exist. 3529 if (PrevDecl == 0) { 3530 Diag(NameLoc, diag::err_not_tag_in_scope) << Name << SS.getRange(); 3531 Name = 0; 3532 Invalid = true; 3533 goto CreateNewDecl; 3534 } 3535 } else if (Name) { 3536 // If this is a named struct, check to see if there was a previous forward 3537 // declaration or definition. 3538 // FIXME: We're looking into outer scopes here, even when we 3539 // shouldn't be. Doing so can result in ambiguities that we 3540 // shouldn't be diagnosing. 3541 LookupResult R = LookupName(S, Name, LookupTagName, 3542 /*RedeclarationOnly=*/(TK != TK_Reference)); 3543 if (R.isAmbiguous()) { 3544 DiagnoseAmbiguousLookup(R, Name, NameLoc); 3545 // FIXME: This is not best way to recover from case like: 3546 // 3547 // struct S s; 3548 // 3549 // causes needless "incomplete type" error later. 3550 Name = 0; 3551 PrevDecl = 0; 3552 Invalid = true; 3553 } 3554 else 3555 PrevDecl = R; 3556 3557 if (!getLangOptions().CPlusPlus && TK != TK_Reference) { 3558 // FIXME: This makes sure that we ignore the contexts associated 3559 // with C structs, unions, and enums when looking for a matching 3560 // tag declaration or definition. See the similar lookup tweak 3561 // in Sema::LookupName; is there a better way to deal with this? 3562 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 3563 SearchDC = SearchDC->getParent(); 3564 } 3565 } 3566 3567 if (PrevDecl && PrevDecl->isTemplateParameter()) { 3568 // Maybe we will complain about the shadowed template parameter. 3569 DiagnoseTemplateParameterShadow(NameLoc, PrevDecl); 3570 // Just pretend that we didn't see the previous declaration. 3571 PrevDecl = 0; 3572 } 3573 3574 if (PrevDecl) { 3575 // Check whether the previous declaration is usable. 3576 (void)DiagnoseUseOfDecl(PrevDecl, NameLoc); 3577 3578 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 3579 // If this is a use of a previous tag, or if the tag is already declared 3580 // in the same scope (so that the definition/declaration completes or 3581 // rementions the tag), reuse the decl. 3582 if (TK == TK_Reference || isDeclInScope(PrevDecl, SearchDC, S)) { 3583 // Make sure that this wasn't declared as an enum and now used as a 3584 // struct or something similar. 3585 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, KWLoc, *Name)) { 3586 bool SafeToContinue 3587 = (PrevTagDecl->getTagKind() != TagDecl::TK_enum && 3588 Kind != TagDecl::TK_enum); 3589 if (SafeToContinue) 3590 Diag(KWLoc, diag::err_use_with_wrong_tag) 3591 << Name 3592 << CodeModificationHint::CreateReplacement(SourceRange(KWLoc), 3593 PrevTagDecl->getKindName()); 3594 else 3595 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 3596 Diag(PrevDecl->getLocation(), diag::note_previous_use); 3597 3598 if (SafeToContinue) 3599 Kind = PrevTagDecl->getTagKind(); 3600 else { 3601 // Recover by making this an anonymous redefinition. 3602 Name = 0; 3603 PrevDecl = 0; 3604 Invalid = true; 3605 } 3606 } 3607 3608 if (!Invalid) { 3609 // If this is a use, just return the declaration we found. 3610 3611 // FIXME: In the future, return a variant or some other clue 3612 // for the consumer of this Decl to know it doesn't own it. 3613 // For our current ASTs this shouldn't be a problem, but will 3614 // need to be changed with DeclGroups. 3615 if (TK == TK_Reference) 3616 return DeclPtrTy::make(PrevDecl); 3617 3618 // Diagnose attempts to redefine a tag. 3619 if (TK == TK_Definition) { 3620 if (TagDecl *Def = PrevTagDecl->getDefinition(Context)) { 3621 Diag(NameLoc, diag::err_redefinition) << Name; 3622 Diag(Def->getLocation(), diag::note_previous_definition); 3623 // If this is a redefinition, recover by making this 3624 // struct be anonymous, which will make any later 3625 // references get the previous definition. 3626 Name = 0; 3627 PrevDecl = 0; 3628 Invalid = true; 3629 } else { 3630 // If the type is currently being defined, complain 3631 // about a nested redefinition. 3632 TagType *Tag = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 3633 if (Tag->isBeingDefined()) { 3634 Diag(NameLoc, diag::err_nested_redefinition) << Name; 3635 Diag(PrevTagDecl->getLocation(), 3636 diag::note_previous_definition); 3637 Name = 0; 3638 PrevDecl = 0; 3639 Invalid = true; 3640 } 3641 } 3642 3643 // Okay, this is definition of a previously declared or referenced 3644 // tag PrevDecl. We're going to create a new Decl for it. 3645 } 3646 } 3647 // If we get here we have (another) forward declaration or we 3648 // have a definition. Just create a new decl. 3649 } else { 3650 // If we get here, this is a definition of a new tag type in a nested 3651 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 3652 // new decl/type. We set PrevDecl to NULL so that the entities 3653 // have distinct types. 3654 PrevDecl = 0; 3655 } 3656 // If we get here, we're going to create a new Decl. If PrevDecl 3657 // is non-NULL, it's a definition of the tag declared by 3658 // PrevDecl. If it's NULL, we have a new definition. 3659 } else { 3660 // PrevDecl is a namespace, template, or anything else 3661 // that lives in the IDNS_Tag identifier namespace. 3662 if (isDeclInScope(PrevDecl, SearchDC, S)) { 3663 // The tag name clashes with a namespace name, issue an error and 3664 // recover by making this tag be anonymous. 3665 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 3666 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3667 Name = 0; 3668 PrevDecl = 0; 3669 Invalid = true; 3670 } else { 3671 // The existing declaration isn't relevant to us; we're in a 3672 // new scope, so clear out the previous declaration. 3673 PrevDecl = 0; 3674 } 3675 } 3676 } else if (TK == TK_Reference && SS.isEmpty() && Name && 3677 (Kind != TagDecl::TK_enum || !getLangOptions().CPlusPlus)) { 3678 // C++ [basic.scope.pdecl]p5: 3679 // -- for an elaborated-type-specifier of the form 3680 // 3681 // class-key identifier 3682 // 3683 // if the elaborated-type-specifier is used in the 3684 // decl-specifier-seq or parameter-declaration-clause of a 3685 // function defined in namespace scope, the identifier is 3686 // declared as a class-name in the namespace that contains 3687 // the declaration; otherwise, except as a friend 3688 // declaration, the identifier is declared in the smallest 3689 // non-class, non-function-prototype scope that contains the 3690 // declaration. 3691 // 3692 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 3693 // C structs and unions. 3694 // 3695 // GNU C also supports this behavior as part of its incomplete 3696 // enum types extension, while GNU C++ does not. 3697 // 3698 // Find the context where we'll be declaring the tag. 3699 // FIXME: We would like to maintain the current DeclContext as the 3700 // lexical context, 3701 while (SearchDC->isRecord()) 3702 SearchDC = SearchDC->getParent(); 3703 3704 // Find the scope where we'll be declaring the tag. 3705 while (S->isClassScope() || 3706 (getLangOptions().CPlusPlus && S->isFunctionPrototypeScope()) || 3707 ((S->getFlags() & Scope::DeclScope) == 0) || 3708 (S->getEntity() && 3709 ((DeclContext *)S->getEntity())->isTransparentContext())) 3710 S = S->getParent(); 3711 } 3712 3713CreateNewDecl: 3714 3715 // If there is an identifier, use the location of the identifier as the 3716 // location of the decl, otherwise use the location of the struct/union 3717 // keyword. 3718 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 3719 3720 // Otherwise, create a new declaration. If there is a previous 3721 // declaration of the same entity, the two will be linked via 3722 // PrevDecl. 3723 TagDecl *New; 3724 3725 if (Kind == TagDecl::TK_enum) { 3726 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 3727 // enum X { A, B, C } D; D should chain to X. 3728 New = EnumDecl::Create(Context, SearchDC, Loc, Name, KWLoc, 3729 cast_or_null<EnumDecl>(PrevDecl)); 3730 // If this is an undefined enum, warn. 3731 if (TK != TK_Definition && !Invalid) { 3732 unsigned DK = getLangOptions().CPlusPlus? diag::err_forward_ref_enum 3733 : diag::ext_forward_ref_enum; 3734 Diag(Loc, DK); 3735 } 3736 } else { 3737 // struct/union/class 3738 3739 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 3740 // struct X { int A; } D; D should chain to X. 3741 if (getLangOptions().CPlusPlus) 3742 // FIXME: Look for a way to use RecordDecl for simple structs. 3743 New = CXXRecordDecl::Create(Context, Kind, SearchDC, Loc, Name, KWLoc, 3744 cast_or_null<CXXRecordDecl>(PrevDecl)); 3745 else 3746 New = RecordDecl::Create(Context, Kind, SearchDC, Loc, Name, KWLoc, 3747 cast_or_null<RecordDecl>(PrevDecl)); 3748 } 3749 3750 if (Kind != TagDecl::TK_enum) { 3751 // Handle #pragma pack: if the #pragma pack stack has non-default 3752 // alignment, make up a packed attribute for this decl. These 3753 // attributes are checked when the ASTContext lays out the 3754 // structure. 3755 // 3756 // It is important for implementing the correct semantics that this 3757 // happen here (in act on tag decl). The #pragma pack stack is 3758 // maintained as a result of parser callbacks which can occur at 3759 // many points during the parsing of a struct declaration (because 3760 // the #pragma tokens are effectively skipped over during the 3761 // parsing of the struct). 3762 if (unsigned Alignment = getPragmaPackAlignment()) 3763 New->addAttr(::new (Context) PackedAttr(Alignment * 8)); 3764 } 3765 3766 if (getLangOptions().CPlusPlus && SS.isEmpty() && Name && !Invalid) { 3767 // C++ [dcl.typedef]p3: 3768 // [...] Similarly, in a given scope, a class or enumeration 3769 // shall not be declared with the same name as a typedef-name 3770 // that is declared in that scope and refers to a type other 3771 // than the class or enumeration itself. 3772 LookupResult Lookup = LookupName(S, Name, LookupOrdinaryName, true); 3773 TypedefDecl *PrevTypedef = 0; 3774 if (Lookup.getKind() == LookupResult::Found) 3775 PrevTypedef = dyn_cast<TypedefDecl>(Lookup.getAsDecl()); 3776 3777 if (PrevTypedef && isDeclInScope(PrevTypedef, SearchDC, S) && 3778 Context.getCanonicalType(Context.getTypeDeclType(PrevTypedef)) != 3779 Context.getCanonicalType(Context.getTypeDeclType(New))) { 3780 Diag(Loc, diag::err_tag_definition_of_typedef) 3781 << Context.getTypeDeclType(New) 3782 << PrevTypedef->getUnderlyingType(); 3783 Diag(PrevTypedef->getLocation(), diag::note_previous_definition); 3784 Invalid = true; 3785 } 3786 } 3787 3788 if (Invalid) 3789 New->setInvalidDecl(); 3790 3791 if (Attr) 3792 ProcessDeclAttributeList(S, New, Attr); 3793 3794 // If we're declaring or defining a tag in function prototype scope 3795 // in C, note that this type can only be used within the function. 3796 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 3797 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 3798 3799 // Set the lexical context. If the tag has a C++ scope specifier, the 3800 // lexical context will be different from the semantic context. 3801 New->setLexicalDeclContext(CurContext); 3802 3803 // Set the access specifier. 3804 if (!Invalid) 3805 SetMemberAccessSpecifier(New, PrevDecl, AS); 3806 3807 if (TK == TK_Definition) 3808 New->startDefinition(); 3809 3810 // If this has an identifier, add it to the scope stack. 3811 if (Name) { 3812 S = getNonFieldDeclScope(S); 3813 PushOnScopeChains(New, S); 3814 } else { 3815 CurContext->addDecl(New); 3816 } 3817 3818 // If this is the C FILE type, notify the AST context. 3819 if (IdentifierInfo *II = New->getIdentifier()) 3820 if (!New->isInvalidDecl() && 3821 New->getDeclContext()->getLookupContext()->isTranslationUnit() && 3822 II->isStr("FILE")) 3823 Context.setFILEDecl(New); 3824 3825 OwnedDecl = true; 3826 return DeclPtrTy::make(New); 3827} 3828 3829void Sema::ActOnTagStartDefinition(Scope *S, DeclPtrTy TagD) { 3830 AdjustDeclIfTemplate(TagD); 3831 TagDecl *Tag = cast<TagDecl>(TagD.getAs<Decl>()); 3832 3833 // Enter the tag context. 3834 PushDeclContext(S, Tag); 3835 3836 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Tag)) { 3837 FieldCollector->StartClass(); 3838 3839 if (Record->getIdentifier()) { 3840 // C++ [class]p2: 3841 // [...] The class-name is also inserted into the scope of the 3842 // class itself; this is known as the injected-class-name. For 3843 // purposes of access checking, the injected-class-name is treated 3844 // as if it were a public member name. 3845 CXXRecordDecl *InjectedClassName 3846 = CXXRecordDecl::Create(Context, Record->getTagKind(), 3847 CurContext, Record->getLocation(), 3848 Record->getIdentifier(), 3849 Record->getTagKeywordLoc(), 3850 Record); 3851 InjectedClassName->setImplicit(); 3852 InjectedClassName->setAccess(AS_public); 3853 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 3854 InjectedClassName->setDescribedClassTemplate(Template); 3855 PushOnScopeChains(InjectedClassName, S); 3856 assert(InjectedClassName->isInjectedClassName() && 3857 "Broken injected-class-name"); 3858 } 3859 } 3860} 3861 3862void Sema::ActOnTagFinishDefinition(Scope *S, DeclPtrTy TagD, 3863 SourceLocation RBraceLoc) { 3864 AdjustDeclIfTemplate(TagD); 3865 TagDecl *Tag = cast<TagDecl>(TagD.getAs<Decl>()); 3866 Tag->setRBraceLoc(RBraceLoc); 3867 3868 if (isa<CXXRecordDecl>(Tag)) 3869 FieldCollector->FinishClass(); 3870 3871 // Exit this scope of this tag's definition. 3872 PopDeclContext(); 3873 3874 // Notify the consumer that we've defined a tag. 3875 Consumer.HandleTagDeclDefinition(Tag); 3876} 3877 3878// Note that FieldName may be null for anonymous bitfields. 3879bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName, 3880 QualType FieldTy, const Expr *BitWidth) { 3881 3882 // C99 6.7.2.1p4 - verify the field type. 3883 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 3884 if (!FieldTy->isDependentType() && !FieldTy->isIntegralType()) { 3885 // Handle incomplete types with specific error. 3886 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 3887 return true; 3888 if (FieldName) 3889 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 3890 << FieldName << FieldTy << BitWidth->getSourceRange(); 3891 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) 3892 << FieldTy << BitWidth->getSourceRange(); 3893 } 3894 3895 // If the bit-width is type- or value-dependent, don't try to check 3896 // it now. 3897 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 3898 return false; 3899 3900 llvm::APSInt Value; 3901 if (VerifyIntegerConstantExpression(BitWidth, &Value)) 3902 return true; 3903 3904 // Zero-width bitfield is ok for anonymous field. 3905 if (Value == 0 && FieldName) 3906 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 3907 3908 if (Value.isSigned() && Value.isNegative()) { 3909 if (FieldName) 3910 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 3911 << FieldName << Value.toString(10); 3912 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) 3913 << Value.toString(10); 3914 } 3915 3916 if (!FieldTy->isDependentType()) { 3917 uint64_t TypeSize = Context.getTypeSize(FieldTy); 3918 if (Value.getZExtValue() > TypeSize) { 3919 if (FieldName) 3920 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 3921 << FieldName << (unsigned)TypeSize; 3922 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) 3923 << (unsigned)TypeSize; 3924 } 3925 } 3926 3927 return false; 3928} 3929 3930/// ActOnField - Each field of a struct/union/class is passed into this in order 3931/// to create a FieldDecl object for it. 3932Sema::DeclPtrTy Sema::ActOnField(Scope *S, DeclPtrTy TagD, 3933 SourceLocation DeclStart, 3934 Declarator &D, ExprTy *BitfieldWidth) { 3935 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD.getAs<Decl>()), 3936 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 3937 AS_public); 3938 return DeclPtrTy::make(Res); 3939} 3940 3941/// HandleField - Analyze a field of a C struct or a C++ data member. 3942/// 3943FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 3944 SourceLocation DeclStart, 3945 Declarator &D, Expr *BitWidth, 3946 AccessSpecifier AS) { 3947 IdentifierInfo *II = D.getIdentifier(); 3948 SourceLocation Loc = DeclStart; 3949 if (II) Loc = D.getIdentifierLoc(); 3950 3951 QualType T = GetTypeForDeclarator(D, S); 3952 if (getLangOptions().CPlusPlus) 3953 CheckExtraCXXDefaultArguments(D); 3954 3955 DiagnoseFunctionSpecifiers(D); 3956 3957 if (D.getDeclSpec().isThreadSpecified()) 3958 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 3959 3960 NamedDecl *PrevDecl = LookupName(S, II, LookupMemberName, true); 3961 3962 if (PrevDecl && PrevDecl->isTemplateParameter()) { 3963 // Maybe we will complain about the shadowed template parameter. 3964 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 3965 // Just pretend that we didn't see the previous declaration. 3966 PrevDecl = 0; 3967 } 3968 3969 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 3970 PrevDecl = 0; 3971 3972 bool Mutable 3973 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable); 3974 SourceLocation TSSL = D.getSourceRange().getBegin(); 3975 FieldDecl *NewFD 3976 = CheckFieldDecl(II, T, Record, Loc, Mutable, BitWidth, TSSL, 3977 AS, PrevDecl, &D); 3978 if (NewFD->isInvalidDecl() && PrevDecl) { 3979 // Don't introduce NewFD into scope; there's already something 3980 // with the same name in the same scope. 3981 } else if (II) { 3982 PushOnScopeChains(NewFD, S); 3983 } else 3984 Record->addDecl(NewFD); 3985 3986 return NewFD; 3987} 3988 3989/// \brief Build a new FieldDecl and check its well-formedness. 3990/// 3991/// This routine builds a new FieldDecl given the fields name, type, 3992/// record, etc. \p PrevDecl should refer to any previous declaration 3993/// with the same name and in the same scope as the field to be 3994/// created. 3995/// 3996/// \returns a new FieldDecl. 3997/// 3998/// \todo The Declarator argument is a hack. It will be removed once 3999FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 4000 RecordDecl *Record, SourceLocation Loc, 4001 bool Mutable, Expr *BitWidth, 4002 SourceLocation TSSL, 4003 AccessSpecifier AS, NamedDecl *PrevDecl, 4004 Declarator *D) { 4005 IdentifierInfo *II = Name.getAsIdentifierInfo(); 4006 bool InvalidDecl = false; 4007 if (D) InvalidDecl = D->isInvalidType(); 4008 4009 // If we receive a broken type, recover by assuming 'int' and 4010 // marking this declaration as invalid. 4011 if (T.isNull()) { 4012 InvalidDecl = true; 4013 T = Context.IntTy; 4014 } 4015 4016 // C99 6.7.2.1p8: A member of a structure or union may have any type other 4017 // than a variably modified type. 4018 if (T->isVariablyModifiedType()) { 4019 bool SizeIsNegative; 4020 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 4021 SizeIsNegative); 4022 if (!FixedTy.isNull()) { 4023 Diag(Loc, diag::warn_illegal_constant_array_size); 4024 T = FixedTy; 4025 } else { 4026 if (SizeIsNegative) 4027 Diag(Loc, diag::err_typecheck_negative_array_size); 4028 else 4029 Diag(Loc, diag::err_typecheck_field_variable_size); 4030 InvalidDecl = true; 4031 } 4032 } 4033 4034 // Fields can not have abstract class types 4035 if (RequireNonAbstractType(Loc, T, diag::err_abstract_type_in_decl, 4036 AbstractFieldType)) 4037 InvalidDecl = true; 4038 4039 // If this is declared as a bit-field, check the bit-field. 4040 if (BitWidth && VerifyBitField(Loc, II, T, BitWidth)) { 4041 InvalidDecl = true; 4042 DeleteExpr(BitWidth); 4043 BitWidth = 0; 4044 } 4045 4046 FieldDecl *NewFD = FieldDecl::Create(Context, Record, Loc, II, T, BitWidth, 4047 Mutable, TSSL); 4048 if (InvalidDecl) 4049 NewFD->setInvalidDecl(); 4050 4051 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 4052 Diag(Loc, diag::err_duplicate_member) << II; 4053 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 4054 NewFD->setInvalidDecl(); 4055 } 4056 4057 if (getLangOptions().CPlusPlus && !T->isPODType()) 4058 cast<CXXRecordDecl>(Record)->setPOD(false); 4059 4060 // FIXME: We need to pass in the attributes given an AST 4061 // representation, not a parser representation. 4062 if (D) 4063 // FIXME: What to pass instead of TUScope? 4064 ProcessDeclAttributes(TUScope, NewFD, *D); 4065 4066 if (T.isObjCGCWeak()) 4067 Diag(Loc, diag::warn_attribute_weak_on_field); 4068 4069 NewFD->setAccess(AS); 4070 4071 // C++ [dcl.init.aggr]p1: 4072 // An aggregate is an array or a class (clause 9) with [...] no 4073 // private or protected non-static data members (clause 11). 4074 // A POD must be an aggregate. 4075 if (getLangOptions().CPlusPlus && 4076 (AS == AS_private || AS == AS_protected)) { 4077 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record); 4078 CXXRecord->setAggregate(false); 4079 CXXRecord->setPOD(false); 4080 } 4081 4082 return NewFD; 4083} 4084 4085/// TranslateIvarVisibility - Translate visibility from a token ID to an 4086/// AST enum value. 4087static ObjCIvarDecl::AccessControl 4088TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 4089 switch (ivarVisibility) { 4090 default: assert(0 && "Unknown visitibility kind"); 4091 case tok::objc_private: return ObjCIvarDecl::Private; 4092 case tok::objc_public: return ObjCIvarDecl::Public; 4093 case tok::objc_protected: return ObjCIvarDecl::Protected; 4094 case tok::objc_package: return ObjCIvarDecl::Package; 4095 } 4096} 4097 4098/// ActOnIvar - Each ivar field of an objective-c class is passed into this 4099/// in order to create an IvarDecl object for it. 4100Sema::DeclPtrTy Sema::ActOnIvar(Scope *S, 4101 SourceLocation DeclStart, 4102 DeclPtrTy IntfDecl, 4103 Declarator &D, ExprTy *BitfieldWidth, 4104 tok::ObjCKeywordKind Visibility) { 4105 4106 IdentifierInfo *II = D.getIdentifier(); 4107 Expr *BitWidth = (Expr*)BitfieldWidth; 4108 SourceLocation Loc = DeclStart; 4109 if (II) Loc = D.getIdentifierLoc(); 4110 4111 // FIXME: Unnamed fields can be handled in various different ways, for 4112 // example, unnamed unions inject all members into the struct namespace! 4113 4114 QualType T = GetTypeForDeclarator(D, S); 4115 4116 if (BitWidth) { 4117 // 6.7.2.1p3, 6.7.2.1p4 4118 if (VerifyBitField(Loc, II, T, BitWidth)) { 4119 D.setInvalidType(); 4120 DeleteExpr(BitWidth); 4121 BitWidth = 0; 4122 } 4123 } else { 4124 // Not a bitfield. 4125 4126 // validate II. 4127 4128 } 4129 4130 // C99 6.7.2.1p8: A member of a structure or union may have any type other 4131 // than a variably modified type. 4132 if (T->isVariablyModifiedType()) { 4133 Diag(Loc, diag::err_typecheck_ivar_variable_size); 4134 D.setInvalidType(); 4135 } 4136 4137 // Get the visibility (access control) for this ivar. 4138 ObjCIvarDecl::AccessControl ac = 4139 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 4140 : ObjCIvarDecl::None; 4141 // Must set ivar's DeclContext to its enclosing interface. 4142 Decl *EnclosingDecl = IntfDecl.getAs<Decl>(); 4143 DeclContext *EnclosingContext; 4144 if (ObjCImplementationDecl *IMPDecl = 4145 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 4146 // Case of ivar declared in an implementation. Context is that of its class. 4147 ObjCInterfaceDecl* IDecl = IMPDecl->getClassInterface(); 4148 assert(IDecl && "No class- ActOnIvar"); 4149 EnclosingContext = cast_or_null<DeclContext>(IDecl); 4150 } 4151 else 4152 EnclosingContext = dyn_cast<DeclContext>(EnclosingDecl); 4153 assert(EnclosingContext && "null DeclContext for ivar - ActOnIvar"); 4154 4155 // Construct the decl. 4156 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, 4157 EnclosingContext, Loc, II, T,ac, 4158 (Expr *)BitfieldWidth); 4159 4160 if (II) { 4161 NamedDecl *PrevDecl = LookupName(S, II, LookupMemberName, true); 4162 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S) 4163 && !isa<TagDecl>(PrevDecl)) { 4164 Diag(Loc, diag::err_duplicate_member) << II; 4165 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 4166 NewID->setInvalidDecl(); 4167 } 4168 } 4169 4170 // Process attributes attached to the ivar. 4171 ProcessDeclAttributes(S, NewID, D); 4172 4173 if (D.isInvalidType()) 4174 NewID->setInvalidDecl(); 4175 4176 if (II) { 4177 // FIXME: When interfaces are DeclContexts, we'll need to add 4178 // these to the interface. 4179 S->AddDecl(DeclPtrTy::make(NewID)); 4180 IdResolver.AddDecl(NewID); 4181 } 4182 4183 return DeclPtrTy::make(NewID); 4184} 4185 4186void Sema::ActOnFields(Scope* S, 4187 SourceLocation RecLoc, DeclPtrTy RecDecl, 4188 DeclPtrTy *Fields, unsigned NumFields, 4189 SourceLocation LBrac, SourceLocation RBrac, 4190 AttributeList *Attr) { 4191 Decl *EnclosingDecl = RecDecl.getAs<Decl>(); 4192 assert(EnclosingDecl && "missing record or interface decl"); 4193 4194 // If the decl this is being inserted into is invalid, then it may be a 4195 // redeclaration or some other bogus case. Don't try to add fields to it. 4196 if (EnclosingDecl->isInvalidDecl()) { 4197 // FIXME: Deallocate fields? 4198 return; 4199 } 4200 4201 4202 // Verify that all the fields are okay. 4203 unsigned NumNamedMembers = 0; 4204 llvm::SmallVector<FieldDecl*, 32> RecFields; 4205 4206 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 4207 for (unsigned i = 0; i != NumFields; ++i) { 4208 FieldDecl *FD = cast<FieldDecl>(Fields[i].getAs<Decl>()); 4209 4210 // Get the type for the field. 4211 Type *FDTy = FD->getType().getTypePtr(); 4212 4213 if (!FD->isAnonymousStructOrUnion()) { 4214 // Remember all fields written by the user. 4215 RecFields.push_back(FD); 4216 } 4217 4218 // If the field is already invalid for some reason, don't emit more 4219 // diagnostics about it. 4220 if (FD->isInvalidDecl()) 4221 continue; 4222 4223 // C99 6.7.2.1p2: 4224 // A structure or union shall not contain a member with 4225 // incomplete or function type (hence, a structure shall not 4226 // contain an instance of itself, but may contain a pointer to 4227 // an instance of itself), except that the last member of a 4228 // structure with more than one named member may have incomplete 4229 // array type; such a structure (and any union containing, 4230 // possibly recursively, a member that is such a structure) 4231 // shall not be a member of a structure or an element of an 4232 // array. 4233 if (FDTy->isFunctionType()) { 4234 // Field declared as a function. 4235 Diag(FD->getLocation(), diag::err_field_declared_as_function) 4236 << FD->getDeclName(); 4237 FD->setInvalidDecl(); 4238 EnclosingDecl->setInvalidDecl(); 4239 continue; 4240 } else if (FDTy->isIncompleteArrayType() && i == NumFields - 1 && 4241 Record && Record->isStruct()) { 4242 // Flexible array member. 4243 if (NumNamedMembers < 1) { 4244 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 4245 << FD->getDeclName(); 4246 FD->setInvalidDecl(); 4247 EnclosingDecl->setInvalidDecl(); 4248 continue; 4249 } 4250 // Okay, we have a legal flexible array member at the end of the struct. 4251 if (Record) 4252 Record->setHasFlexibleArrayMember(true); 4253 } else if (!FDTy->isDependentType() && 4254 RequireCompleteType(FD->getLocation(), FD->getType(), 4255 diag::err_field_incomplete)) { 4256 // Incomplete type 4257 FD->setInvalidDecl(); 4258 EnclosingDecl->setInvalidDecl(); 4259 continue; 4260 } else if (const RecordType *FDTTy = FDTy->getAsRecordType()) { 4261 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 4262 // If this is a member of a union, then entire union becomes "flexible". 4263 if (Record && Record->isUnion()) { 4264 Record->setHasFlexibleArrayMember(true); 4265 } else { 4266 // If this is a struct/class and this is not the last element, reject 4267 // it. Note that GCC supports variable sized arrays in the middle of 4268 // structures. 4269 if (i != NumFields-1) 4270 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 4271 << FD->getDeclName() << FD->getType(); 4272 else { 4273 // We support flexible arrays at the end of structs in 4274 // other structs as an extension. 4275 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 4276 << FD->getDeclName(); 4277 if (Record) 4278 Record->setHasFlexibleArrayMember(true); 4279 } 4280 } 4281 } 4282 if (Record && FDTTy->getDecl()->hasObjectMember()) 4283 Record->setHasObjectMember(true); 4284 } else if (FDTy->isObjCInterfaceType()) { 4285 /// A field cannot be an Objective-c object 4286 Diag(FD->getLocation(), diag::err_statically_allocated_object); 4287 FD->setInvalidDecl(); 4288 EnclosingDecl->setInvalidDecl(); 4289 continue; 4290 } 4291 else if (getLangOptions().ObjC1 && 4292 getLangOptions().getGCMode() != LangOptions::NonGC && 4293 Record && 4294 (FD->getType()->isObjCObjectPointerType() || 4295 FD->getType().isObjCGCStrong())) 4296 Record->setHasObjectMember(true); 4297 // Keep track of the number of named members. 4298 if (FD->getIdentifier()) 4299 ++NumNamedMembers; 4300 } 4301 4302 // Okay, we successfully defined 'Record'. 4303 if (Record) { 4304 Record->completeDefinition(Context); 4305 } else { 4306 ObjCIvarDecl **ClsFields = 4307 reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); 4308 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 4309 ID->setIVarList(ClsFields, RecFields.size(), Context); 4310 ID->setLocEnd(RBrac); 4311 // Add ivar's to class's DeclContext. 4312 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 4313 ClsFields[i]->setLexicalDeclContext(ID); 4314 ID->addDecl(ClsFields[i]); 4315 } 4316 // Must enforce the rule that ivars in the base classes may not be 4317 // duplicates. 4318 if (ID->getSuperClass()) { 4319 for (ObjCInterfaceDecl::ivar_iterator IVI = ID->ivar_begin(), 4320 IVE = ID->ivar_end(); IVI != IVE; ++IVI) { 4321 ObjCIvarDecl* Ivar = (*IVI); 4322 4323 if (IdentifierInfo *II = Ivar->getIdentifier()) { 4324 ObjCIvarDecl* prevIvar = 4325 ID->getSuperClass()->lookupInstanceVariable(II); 4326 if (prevIvar) { 4327 Diag(Ivar->getLocation(), diag::err_duplicate_member) << II; 4328 Diag(prevIvar->getLocation(), diag::note_previous_declaration); 4329 } 4330 } 4331 } 4332 } 4333 } else if (ObjCImplementationDecl *IMPDecl = 4334 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 4335 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 4336 for (unsigned I = 0, N = RecFields.size(); I != N; ++I) 4337 // Ivar declared in @implementation never belongs to the implementation. 4338 // Only it is in implementation's lexical context. 4339 ClsFields[I]->setLexicalDeclContext(IMPDecl); 4340 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 4341 } 4342 } 4343 4344 if (Attr) 4345 ProcessDeclAttributeList(S, Record, Attr); 4346} 4347 4348EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 4349 EnumConstantDecl *LastEnumConst, 4350 SourceLocation IdLoc, 4351 IdentifierInfo *Id, 4352 ExprArg val) { 4353 Expr *Val = (Expr *)val.get(); 4354 4355 llvm::APSInt EnumVal(32); 4356 QualType EltTy; 4357 if (Val && !Val->isTypeDependent()) { 4358 // Make sure to promote the operand type to int. 4359 UsualUnaryConversions(Val); 4360 if (Val != val.get()) { 4361 val.release(); 4362 val = Val; 4363 } 4364 4365 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 4366 SourceLocation ExpLoc; 4367 if (!Val->isValueDependent() && 4368 VerifyIntegerConstantExpression(Val, &EnumVal)) { 4369 Val = 0; 4370 } else { 4371 EltTy = Val->getType(); 4372 } 4373 } 4374 4375 if (!Val) { 4376 if (LastEnumConst) { 4377 // Assign the last value + 1. 4378 EnumVal = LastEnumConst->getInitVal(); 4379 ++EnumVal; 4380 4381 // Check for overflow on increment. 4382 if (EnumVal < LastEnumConst->getInitVal()) 4383 Diag(IdLoc, diag::warn_enum_value_overflow); 4384 4385 EltTy = LastEnumConst->getType(); 4386 } else { 4387 // First value, set to zero. 4388 EltTy = Context.IntTy; 4389 EnumVal.zextOrTrunc(static_cast<uint32_t>(Context.getTypeSize(EltTy))); 4390 } 4391 } 4392 4393 val.release(); 4394 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 4395 Val, EnumVal); 4396} 4397 4398 4399Sema::DeclPtrTy Sema::ActOnEnumConstant(Scope *S, DeclPtrTy theEnumDecl, 4400 DeclPtrTy lastEnumConst, 4401 SourceLocation IdLoc, 4402 IdentifierInfo *Id, 4403 SourceLocation EqualLoc, ExprTy *val) { 4404 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl.getAs<Decl>()); 4405 EnumConstantDecl *LastEnumConst = 4406 cast_or_null<EnumConstantDecl>(lastEnumConst.getAs<Decl>()); 4407 Expr *Val = static_cast<Expr*>(val); 4408 4409 // The scope passed in may not be a decl scope. Zip up the scope tree until 4410 // we find one that is. 4411 S = getNonFieldDeclScope(S); 4412 4413 // Verify that there isn't already something declared with this name in this 4414 // scope. 4415 NamedDecl *PrevDecl = LookupName(S, Id, LookupOrdinaryName); 4416 if (PrevDecl && PrevDecl->isTemplateParameter()) { 4417 // Maybe we will complain about the shadowed template parameter. 4418 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 4419 // Just pretend that we didn't see the previous declaration. 4420 PrevDecl = 0; 4421 } 4422 4423 if (PrevDecl) { 4424 // When in C++, we may get a TagDecl with the same name; in this case the 4425 // enum constant will 'hide' the tag. 4426 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 4427 "Received TagDecl when not in C++!"); 4428 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 4429 if (isa<EnumConstantDecl>(PrevDecl)) 4430 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 4431 else 4432 Diag(IdLoc, diag::err_redefinition) << Id; 4433 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4434 if (Val) Val->Destroy(Context); 4435 return DeclPtrTy(); 4436 } 4437 } 4438 4439 EnumConstantDecl *New = CheckEnumConstant(TheEnumDecl, LastEnumConst, 4440 IdLoc, Id, Owned(Val)); 4441 4442 // Register this decl in the current scope stack. 4443 if (New) 4444 PushOnScopeChains(New, S); 4445 4446 return DeclPtrTy::make(New); 4447} 4448 4449void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc, 4450 SourceLocation RBraceLoc, DeclPtrTy EnumDeclX, 4451 DeclPtrTy *Elements, unsigned NumElements) { 4452 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX.getAs<Decl>()); 4453 QualType EnumType = Context.getTypeDeclType(Enum); 4454 4455 // TODO: If the result value doesn't fit in an int, it must be a long or long 4456 // long value. ISO C does not support this, but GCC does as an extension, 4457 // emit a warning. 4458 unsigned IntWidth = Context.Target.getIntWidth(); 4459 4460 // Verify that all the values are okay, compute the size of the values, and 4461 // reverse the list. 4462 unsigned NumNegativeBits = 0; 4463 unsigned NumPositiveBits = 0; 4464 4465 // Keep track of whether all elements have type int. 4466 bool AllElementsInt = true; 4467 4468 for (unsigned i = 0; i != NumElements; ++i) { 4469 EnumConstantDecl *ECD = 4470 cast_or_null<EnumConstantDecl>(Elements[i].getAs<Decl>()); 4471 if (!ECD) continue; // Already issued a diagnostic. 4472 4473 // If the enum value doesn't fit in an int, emit an extension warning. 4474 const llvm::APSInt &InitVal = ECD->getInitVal(); 4475 assert(InitVal.getBitWidth() >= IntWidth && 4476 "Should have promoted value to int"); 4477 if (InitVal.getBitWidth() > IntWidth) { 4478 llvm::APSInt V(InitVal); 4479 V.trunc(IntWidth); 4480 V.extend(InitVal.getBitWidth()); 4481 if (V != InitVal) 4482 Diag(ECD->getLocation(), diag::ext_enum_value_not_int) 4483 << InitVal.toString(10); 4484 } 4485 4486 // Keep track of the size of positive and negative values. 4487 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 4488 NumPositiveBits = std::max(NumPositiveBits, 4489 (unsigned)InitVal.getActiveBits()); 4490 else 4491 NumNegativeBits = std::max(NumNegativeBits, 4492 (unsigned)InitVal.getMinSignedBits()); 4493 4494 // Keep track of whether every enum element has type int (very commmon). 4495 if (AllElementsInt) 4496 AllElementsInt = ECD->getType() == Context.IntTy; 4497 } 4498 4499 // Figure out the type that should be used for this enum. 4500 // FIXME: Support attribute(packed) on enums and -fshort-enums. 4501 QualType BestType; 4502 unsigned BestWidth; 4503 4504 if (NumNegativeBits) { 4505 // If there is a negative value, figure out the smallest integer type (of 4506 // int/long/longlong) that fits. 4507 if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 4508 BestType = Context.IntTy; 4509 BestWidth = IntWidth; 4510 } else { 4511 BestWidth = Context.Target.getLongWidth(); 4512 4513 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) 4514 BestType = Context.LongTy; 4515 else { 4516 BestWidth = Context.Target.getLongLongWidth(); 4517 4518 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 4519 Diag(Enum->getLocation(), diag::warn_enum_too_large); 4520 BestType = Context.LongLongTy; 4521 } 4522 } 4523 } else { 4524 // If there is no negative value, figure out which of uint, ulong, ulonglong 4525 // fits. 4526 if (NumPositiveBits <= IntWidth) { 4527 BestType = Context.UnsignedIntTy; 4528 BestWidth = IntWidth; 4529 } else if (NumPositiveBits <= 4530 (BestWidth = Context.Target.getLongWidth())) { 4531 BestType = Context.UnsignedLongTy; 4532 } else { 4533 BestWidth = Context.Target.getLongLongWidth(); 4534 assert(NumPositiveBits <= BestWidth && 4535 "How could an initializer get larger than ULL?"); 4536 BestType = Context.UnsignedLongLongTy; 4537 } 4538 } 4539 4540 // Loop over all of the enumerator constants, changing their types to match 4541 // the type of the enum if needed. 4542 for (unsigned i = 0; i != NumElements; ++i) { 4543 EnumConstantDecl *ECD = 4544 cast_or_null<EnumConstantDecl>(Elements[i].getAs<Decl>()); 4545 if (!ECD) continue; // Already issued a diagnostic. 4546 4547 // Standard C says the enumerators have int type, but we allow, as an 4548 // extension, the enumerators to be larger than int size. If each 4549 // enumerator value fits in an int, type it as an int, otherwise type it the 4550 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 4551 // that X has type 'int', not 'unsigned'. 4552 if (ECD->getType() == Context.IntTy) { 4553 // Make sure the init value is signed. 4554 llvm::APSInt IV = ECD->getInitVal(); 4555 IV.setIsSigned(true); 4556 ECD->setInitVal(IV); 4557 4558 if (getLangOptions().CPlusPlus) 4559 // C++ [dcl.enum]p4: Following the closing brace of an 4560 // enum-specifier, each enumerator has the type of its 4561 // enumeration. 4562 ECD->setType(EnumType); 4563 continue; // Already int type. 4564 } 4565 4566 // Determine whether the value fits into an int. 4567 llvm::APSInt InitVal = ECD->getInitVal(); 4568 bool FitsInInt; 4569 if (InitVal.isUnsigned() || !InitVal.isNegative()) 4570 FitsInInt = InitVal.getActiveBits() < IntWidth; 4571 else 4572 FitsInInt = InitVal.getMinSignedBits() <= IntWidth; 4573 4574 // If it fits into an integer type, force it. Otherwise force it to match 4575 // the enum decl type. 4576 QualType NewTy; 4577 unsigned NewWidth; 4578 bool NewSign; 4579 if (FitsInInt) { 4580 NewTy = Context.IntTy; 4581 NewWidth = IntWidth; 4582 NewSign = true; 4583 } else if (ECD->getType() == BestType) { 4584 // Already the right type! 4585 if (getLangOptions().CPlusPlus) 4586 // C++ [dcl.enum]p4: Following the closing brace of an 4587 // enum-specifier, each enumerator has the type of its 4588 // enumeration. 4589 ECD->setType(EnumType); 4590 continue; 4591 } else { 4592 NewTy = BestType; 4593 NewWidth = BestWidth; 4594 NewSign = BestType->isSignedIntegerType(); 4595 } 4596 4597 // Adjust the APSInt value. 4598 InitVal.extOrTrunc(NewWidth); 4599 InitVal.setIsSigned(NewSign); 4600 ECD->setInitVal(InitVal); 4601 4602 // Adjust the Expr initializer and type. 4603 if (ECD->getInitExpr()) 4604 ECD->setInitExpr(new (Context) ImplicitCastExpr(NewTy, ECD->getInitExpr(), 4605 /*isLvalue=*/false)); 4606 if (getLangOptions().CPlusPlus) 4607 // C++ [dcl.enum]p4: Following the closing brace of an 4608 // enum-specifier, each enumerator has the type of its 4609 // enumeration. 4610 ECD->setType(EnumType); 4611 else 4612 ECD->setType(NewTy); 4613 } 4614 4615 Enum->completeDefinition(Context, BestType); 4616} 4617 4618Sema::DeclPtrTy Sema::ActOnFileScopeAsmDecl(SourceLocation Loc, 4619 ExprArg expr) { 4620 StringLiteral *AsmString = cast<StringLiteral>(expr.takeAs<Expr>()); 4621 4622 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext, 4623 Loc, AsmString); 4624 CurContext->addDecl(New); 4625 return DeclPtrTy::make(New); 4626} 4627 4628void Sema::ActOnPragmaWeakID(IdentifierInfo* Name, 4629 SourceLocation PragmaLoc, 4630 SourceLocation NameLoc) { 4631 Decl *PrevDecl = LookupName(TUScope, Name, LookupOrdinaryName); 4632 4633 // FIXME: This implementation is an ugly hack! 4634 if (PrevDecl) { 4635 PrevDecl->addAttr(::new (Context) WeakAttr()); 4636 return; 4637 } 4638 Diag(PragmaLoc, diag::err_unsupported_pragma_weak); 4639 return; 4640} 4641 4642void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name, 4643 IdentifierInfo* AliasName, 4644 SourceLocation PragmaLoc, 4645 SourceLocation NameLoc, 4646 SourceLocation AliasNameLoc) { 4647 Decl *PrevDecl = LookupName(TUScope, Name, LookupOrdinaryName); 4648 4649 // FIXME: This implementation is an ugly hack! 4650 if (PrevDecl) { 4651 PrevDecl->addAttr(::new (Context) AliasAttr(AliasName->getName())); 4652 PrevDecl->addAttr(::new (Context) WeakAttr()); 4653 return; 4654 } 4655 Diag(PragmaLoc, diag::err_unsupported_pragma_weak); 4656 return; 4657} 4658