SemaDecl.cpp revision 260ad501d479ae610259272ad5ce13910b0cc0ac
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->isOutOfLineDefinition()) 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/// \brief Determine whether we allow overloading of the function 223/// PrevDecl with another declaration. 224/// 225/// This routine determines whether overloading is possible, not 226/// whether some new function is actually an overload. It will return 227/// true in C++ (where we can always provide overloads) or, as an 228/// extension, in C when the previous function is already an 229/// overloaded function declaration or has the "overloadable" 230/// attribute. 231static bool AllowOverloadingOfFunction(Decl *PrevDecl, ASTContext &Context) { 232 if (Context.getLangOptions().CPlusPlus) 233 return true; 234 235 if (isa<OverloadedFunctionDecl>(PrevDecl)) 236 return true; 237 238 return PrevDecl->getAttr<OverloadableAttr>() != 0; 239} 240 241/// Add this decl to the scope shadowed decl chains. 242void Sema::PushOnScopeChains(NamedDecl *D, Scope *S) { 243 // Move up the scope chain until we find the nearest enclosing 244 // non-transparent context. The declaration will be introduced into this 245 // scope. 246 while (S->getEntity() && 247 ((DeclContext *)S->getEntity())->isTransparentContext()) 248 S = S->getParent(); 249 250 S->AddDecl(DeclPtrTy::make(D)); 251 252 // Add scoped declarations into their context, so that they can be 253 // found later. Declarations without a context won't be inserted 254 // into any context. 255 CurContext->addDecl(Context, D); 256 257 // C++ [basic.scope]p4: 258 // -- exactly one declaration shall declare a class name or 259 // enumeration name that is not a typedef name and the other 260 // declarations shall all refer to the same object or 261 // enumerator, or all refer to functions and function templates; 262 // in this case the class name or enumeration name is hidden. 263 if (TagDecl *TD = dyn_cast<TagDecl>(D)) { 264 // We are pushing the name of a tag (enum or class). 265 if (CurContext->getLookupContext() 266 == TD->getDeclContext()->getLookupContext()) { 267 // We're pushing the tag into the current context, which might 268 // require some reshuffling in the identifier resolver. 269 IdentifierResolver::iterator 270 I = IdResolver.begin(TD->getDeclName()), 271 IEnd = IdResolver.end(); 272 if (I != IEnd && isDeclInScope(*I, CurContext, S)) { 273 NamedDecl *PrevDecl = *I; 274 for (; I != IEnd && isDeclInScope(*I, CurContext, S); 275 PrevDecl = *I, ++I) { 276 if (TD->declarationReplaces(*I)) { 277 // This is a redeclaration. Remove it from the chain and 278 // break out, so that we'll add in the shadowed 279 // declaration. 280 S->RemoveDecl(DeclPtrTy::make(*I)); 281 if (PrevDecl == *I) { 282 IdResolver.RemoveDecl(*I); 283 IdResolver.AddDecl(TD); 284 return; 285 } else { 286 IdResolver.RemoveDecl(*I); 287 break; 288 } 289 } 290 } 291 292 // There is already a declaration with the same name in the same 293 // scope, which is not a tag declaration. It must be found 294 // before we find the new declaration, so insert the new 295 // declaration at the end of the chain. 296 IdResolver.AddShadowedDecl(TD, PrevDecl); 297 298 return; 299 } 300 } 301 } else if (isa<FunctionDecl>(D) && 302 AllowOverloadingOfFunction(D, Context)) { 303 // We are pushing the name of a function, which might be an 304 // overloaded name. 305 FunctionDecl *FD = cast<FunctionDecl>(D); 306 IdentifierResolver::iterator Redecl 307 = std::find_if(IdResolver.begin(FD->getDeclName()), 308 IdResolver.end(), 309 std::bind1st(std::mem_fun(&NamedDecl::declarationReplaces), 310 FD)); 311 if (Redecl != IdResolver.end() && 312 S->isDeclScope(DeclPtrTy::make(*Redecl))) { 313 // There is already a declaration of a function on our 314 // IdResolver chain. Replace it with this declaration. 315 S->RemoveDecl(DeclPtrTy::make(*Redecl)); 316 IdResolver.RemoveDecl(*Redecl); 317 } 318 } else if (isa<ObjCInterfaceDecl>(D)) { 319 // We're pushing an Objective-C interface into the current 320 // context. If there is already an alias declaration, remove it first. 321 for (IdentifierResolver::iterator 322 I = IdResolver.begin(D->getDeclName()), IEnd = IdResolver.end(); 323 I != IEnd; ++I) { 324 if (isa<ObjCCompatibleAliasDecl>(*I)) { 325 S->RemoveDecl(DeclPtrTy::make(*I)); 326 IdResolver.RemoveDecl(*I); 327 break; 328 } 329 } 330 } 331 332 IdResolver.AddDecl(D); 333} 334 335void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) { 336 if (S->decl_empty()) return; 337 assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) && 338 "Scope shouldn't contain decls!"); 339 340 for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end(); 341 I != E; ++I) { 342 Decl *TmpD = (*I).getAs<Decl>(); 343 assert(TmpD && "This decl didn't get pushed??"); 344 345 assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?"); 346 NamedDecl *D = cast<NamedDecl>(TmpD); 347 348 if (!D->getDeclName()) continue; 349 350 // Remove this name from our lexical scope. 351 IdResolver.RemoveDecl(D); 352 } 353} 354 355/// getObjCInterfaceDecl - Look up a for a class declaration in the scope. 356/// return 0 if one not found. 357ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *Id) { 358 // The third "scope" argument is 0 since we aren't enabling lazy built-in 359 // creation from this context. 360 NamedDecl *IDecl = LookupName(TUScope, Id, LookupOrdinaryName); 361 362 return dyn_cast_or_null<ObjCInterfaceDecl>(IDecl); 363} 364 365/// getNonFieldDeclScope - Retrieves the innermost scope, starting 366/// from S, where a non-field would be declared. This routine copes 367/// with the difference between C and C++ scoping rules in structs and 368/// unions. For example, the following code is well-formed in C but 369/// ill-formed in C++: 370/// @code 371/// struct S6 { 372/// enum { BAR } e; 373/// }; 374/// 375/// void test_S6() { 376/// struct S6 a; 377/// a.e = BAR; 378/// } 379/// @endcode 380/// For the declaration of BAR, this routine will return a different 381/// scope. The scope S will be the scope of the unnamed enumeration 382/// within S6. In C++, this routine will return the scope associated 383/// with S6, because the enumeration's scope is a transparent 384/// context but structures can contain non-field names. In C, this 385/// routine will return the translation unit scope, since the 386/// enumeration's scope is a transparent context and structures cannot 387/// contain non-field names. 388Scope *Sema::getNonFieldDeclScope(Scope *S) { 389 while (((S->getFlags() & Scope::DeclScope) == 0) || 390 (S->getEntity() && 391 ((DeclContext *)S->getEntity())->isTransparentContext()) || 392 (S->isClassScope() && !getLangOptions().CPlusPlus)) 393 S = S->getParent(); 394 return S; 395} 396 397void Sema::InitBuiltinVaListType() { 398 if (!Context.getBuiltinVaListType().isNull()) 399 return; 400 401 IdentifierInfo *VaIdent = &Context.Idents.get("__builtin_va_list"); 402 NamedDecl *VaDecl = LookupName(TUScope, VaIdent, LookupOrdinaryName); 403 TypedefDecl *VaTypedef = cast<TypedefDecl>(VaDecl); 404 Context.setBuiltinVaListType(Context.getTypedefType(VaTypedef)); 405} 406 407/// LazilyCreateBuiltin - The specified Builtin-ID was first used at 408/// file scope. lazily create a decl for it. ForRedeclaration is true 409/// if we're creating this built-in in anticipation of redeclaring the 410/// built-in. 411NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid, 412 Scope *S, bool ForRedeclaration, 413 SourceLocation Loc) { 414 Builtin::ID BID = (Builtin::ID)bid; 415 416 if (Context.BuiltinInfo.hasVAListUse(BID)) 417 InitBuiltinVaListType(); 418 419 ASTContext::GetBuiltinTypeError Error; 420 QualType R = Context.GetBuiltinType(BID, Error); 421 switch (Error) { 422 case ASTContext::GE_None: 423 // Okay 424 break; 425 426 case ASTContext::GE_Missing_FILE: 427 if (ForRedeclaration) 428 Diag(Loc, diag::err_implicit_decl_requires_stdio) 429 << Context.BuiltinInfo.GetName(BID); 430 return 0; 431 } 432 433 if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) { 434 Diag(Loc, diag::ext_implicit_lib_function_decl) 435 << Context.BuiltinInfo.GetName(BID) 436 << R; 437 if (Context.BuiltinInfo.getHeaderName(BID) && 438 Diags.getDiagnosticLevel(diag::ext_implicit_lib_function_decl) 439 != Diagnostic::Ignored) 440 Diag(Loc, diag::note_please_include_header) 441 << Context.BuiltinInfo.getHeaderName(BID) 442 << Context.BuiltinInfo.GetName(BID); 443 } 444 445 FunctionDecl *New = FunctionDecl::Create(Context, 446 Context.getTranslationUnitDecl(), 447 Loc, II, R, 448 FunctionDecl::Extern, false, 449 /*hasPrototype=*/true); 450 New->setImplicit(); 451 452 // Create Decl objects for each parameter, adding them to the 453 // FunctionDecl. 454 if (FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) { 455 llvm::SmallVector<ParmVarDecl*, 16> Params; 456 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) 457 Params.push_back(ParmVarDecl::Create(Context, New, SourceLocation(), 0, 458 FT->getArgType(i), VarDecl::None, 0)); 459 New->setParams(Context, Params.data(), Params.size()); 460 } 461 462 AddKnownFunctionAttributes(New); 463 464 // TUScope is the translation-unit scope to insert this function into. 465 // FIXME: This is hideous. We need to teach PushOnScopeChains to 466 // relate Scopes to DeclContexts, and probably eliminate CurContext 467 // entirely, but we're not there yet. 468 DeclContext *SavedContext = CurContext; 469 CurContext = Context.getTranslationUnitDecl(); 470 PushOnScopeChains(New, TUScope); 471 CurContext = SavedContext; 472 return New; 473} 474 475/// GetStdNamespace - This method gets the C++ "std" namespace. This is where 476/// everything from the standard library is defined. 477NamespaceDecl *Sema::GetStdNamespace() { 478 if (!StdNamespace) { 479 IdentifierInfo *StdIdent = &PP.getIdentifierTable().get("std"); 480 DeclContext *Global = Context.getTranslationUnitDecl(); 481 Decl *Std = LookupQualifiedName(Global, StdIdent, LookupNamespaceName); 482 StdNamespace = dyn_cast_or_null<NamespaceDecl>(Std); 483 } 484 return StdNamespace; 485} 486 487/// MergeTypeDefDecl - We just parsed a typedef 'New' which has the 488/// same name and scope as a previous declaration 'Old'. Figure out 489/// how to resolve this situation, merging decls or emitting 490/// diagnostics as appropriate. If there was an error, set New to be invalid. 491/// 492void Sema::MergeTypeDefDecl(TypedefDecl *New, Decl *OldD) { 493 // If either decl is known invalid already, set the new one to be invalid and 494 // don't bother doing any merging checks. 495 if (New->isInvalidDecl() || OldD->isInvalidDecl()) 496 return New->setInvalidDecl(); 497 498 bool objc_types = false; 499 500 // Allow multiple definitions for ObjC built-in typedefs. 501 // FIXME: Verify the underlying types are equivalent! 502 if (getLangOptions().ObjC1) { 503 const IdentifierInfo *TypeID = New->getIdentifier(); 504 switch (TypeID->getLength()) { 505 default: break; 506 case 2: 507 if (!TypeID->isStr("id")) 508 break; 509 Context.setObjCIdType(Context.getTypeDeclType(New)); 510 objc_types = true; 511 break; 512 case 5: 513 if (!TypeID->isStr("Class")) 514 break; 515 Context.setObjCClassType(Context.getTypeDeclType(New)); 516 return; 517 case 3: 518 if (!TypeID->isStr("SEL")) 519 break; 520 Context.setObjCSelType(Context.getTypeDeclType(New)); 521 return; 522 case 8: 523 if (!TypeID->isStr("Protocol")) 524 break; 525 Context.setObjCProtoType(New->getUnderlyingType()); 526 return; 527 } 528 // Fall through - the typedef name was not a builtin type. 529 } 530 // Verify the old decl was also a type. 531 TypeDecl *Old = dyn_cast<TypeDecl>(OldD); 532 if (!Old) { 533 Diag(New->getLocation(), diag::err_redefinition_different_kind) 534 << New->getDeclName(); 535 if (OldD->getLocation().isValid()) 536 Diag(OldD->getLocation(), diag::note_previous_definition); 537 return New->setInvalidDecl(); 538 } 539 540 // Determine the "old" type we'll use for checking and diagnostics. 541 QualType OldType; 542 if (TypedefDecl *OldTypedef = dyn_cast<TypedefDecl>(Old)) 543 OldType = OldTypedef->getUnderlyingType(); 544 else 545 OldType = Context.getTypeDeclType(Old); 546 547 // If the typedef types are not identical, reject them in all languages and 548 // with any extensions enabled. 549 550 if (OldType != New->getUnderlyingType() && 551 Context.getCanonicalType(OldType) != 552 Context.getCanonicalType(New->getUnderlyingType())) { 553 Diag(New->getLocation(), diag::err_redefinition_different_typedef) 554 << New->getUnderlyingType() << OldType; 555 if (Old->getLocation().isValid()) 556 Diag(Old->getLocation(), diag::note_previous_definition); 557 return New->setInvalidDecl(); 558 } 559 560 if (objc_types || getLangOptions().Microsoft) 561 return; 562 563 // C++ [dcl.typedef]p2: 564 // In a given non-class scope, a typedef specifier can be used to 565 // redefine the name of any type declared in that scope to refer 566 // to the type to which it already refers. 567 if (getLangOptions().CPlusPlus) { 568 if (!isa<CXXRecordDecl>(CurContext)) 569 return; 570 Diag(New->getLocation(), diag::err_redefinition) 571 << New->getDeclName(); 572 Diag(Old->getLocation(), diag::note_previous_definition); 573 return New->setInvalidDecl(); 574 } 575 576 // If we have a redefinition of a typedef in C, emit a warning. This warning 577 // is normally mapped to an error, but can be controlled with 578 // -Wtypedef-redefinition. If either the original or the redefinition is 579 // in a system header, don't emit this for compatibility with GCC. 580 if (PP.getDiagnostics().getSuppressSystemWarnings() && 581 (Context.getSourceManager().isInSystemHeader(Old->getLocation()) || 582 Context.getSourceManager().isInSystemHeader(New->getLocation()))) 583 return; 584 585 Diag(New->getLocation(), diag::warn_redefinition_of_typedef) 586 << New->getDeclName(); 587 Diag(Old->getLocation(), diag::note_previous_definition); 588 return; 589} 590 591/// DeclhasAttr - returns true if decl Declaration already has the target 592/// attribute. 593static bool DeclHasAttr(const Decl *decl, const Attr *target) { 594 for (const Attr *attr = decl->getAttrs(); attr; attr = attr->getNext()) 595 if (attr->getKind() == target->getKind()) 596 return true; 597 598 return false; 599} 600 601/// MergeAttributes - append attributes from the Old decl to the New one. 602static void MergeAttributes(Decl *New, Decl *Old, ASTContext &C) { 603 for (const Attr *attr = Old->getAttrs(); attr; attr = attr->getNext()) { 604 if (!DeclHasAttr(New, attr) && attr->isMerged()) { 605 Attr *NewAttr = attr->clone(C); 606 NewAttr->setInherited(true); 607 New->addAttr(NewAttr); 608 } 609 } 610} 611 612/// Used in MergeFunctionDecl to keep track of function parameters in 613/// C. 614struct GNUCompatibleParamWarning { 615 ParmVarDecl *OldParm; 616 ParmVarDecl *NewParm; 617 QualType PromotedType; 618}; 619 620/// MergeFunctionDecl - We just parsed a function 'New' from 621/// declarator D which has the same name and scope as a previous 622/// declaration 'Old'. Figure out how to resolve this situation, 623/// merging decls or emitting diagnostics as appropriate. 624/// 625/// In C++, New and Old must be declarations that are not 626/// overloaded. Use IsOverload to determine whether New and Old are 627/// overloaded, and to select the Old declaration that New should be 628/// merged with. 629/// 630/// Returns true if there was an error, false otherwise. 631bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD) { 632 assert(!isa<OverloadedFunctionDecl>(OldD) && 633 "Cannot merge with an overloaded function declaration"); 634 635 // Verify the old decl was also a function. 636 FunctionDecl *Old = dyn_cast<FunctionDecl>(OldD); 637 if (!Old) { 638 Diag(New->getLocation(), diag::err_redefinition_different_kind) 639 << New->getDeclName(); 640 Diag(OldD->getLocation(), diag::note_previous_definition); 641 return true; 642 } 643 644 // Determine whether the previous declaration was a definition, 645 // implicit declaration, or a declaration. 646 diag::kind PrevDiag; 647 if (Old->isThisDeclarationADefinition()) 648 PrevDiag = diag::note_previous_definition; 649 else if (Old->isImplicit()) 650 PrevDiag = diag::note_previous_implicit_declaration; 651 else 652 PrevDiag = diag::note_previous_declaration; 653 654 QualType OldQType = Context.getCanonicalType(Old->getType()); 655 QualType NewQType = Context.getCanonicalType(New->getType()); 656 657 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) && 658 New->getStorageClass() == FunctionDecl::Static && 659 Old->getStorageClass() != FunctionDecl::Static) { 660 Diag(New->getLocation(), diag::err_static_non_static) 661 << New; 662 Diag(Old->getLocation(), PrevDiag); 663 return true; 664 } 665 666 if (getLangOptions().CPlusPlus) { 667 // (C++98 13.1p2): 668 // Certain function declarations cannot be overloaded: 669 // -- Function declarations that differ only in the return type 670 // cannot be overloaded. 671 QualType OldReturnType 672 = cast<FunctionType>(OldQType.getTypePtr())->getResultType(); 673 QualType NewReturnType 674 = cast<FunctionType>(NewQType.getTypePtr())->getResultType(); 675 if (OldReturnType != NewReturnType) { 676 Diag(New->getLocation(), diag::err_ovl_diff_return_type); 677 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 678 return true; 679 } 680 681 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 682 const CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 683 if (OldMethod && NewMethod && 684 OldMethod->getLexicalDeclContext() == 685 NewMethod->getLexicalDeclContext()) { 686 // -- Member function declarations with the same name and the 687 // same parameter types cannot be overloaded if any of them 688 // is a static member function declaration. 689 if (OldMethod->isStatic() || NewMethod->isStatic()) { 690 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 691 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 692 return true; 693 } 694 695 // C++ [class.mem]p1: 696 // [...] A member shall not be declared twice in the 697 // member-specification, except that a nested class or member 698 // class template can be declared and then later defined. 699 unsigned NewDiag; 700 if (isa<CXXConstructorDecl>(OldMethod)) 701 NewDiag = diag::err_constructor_redeclared; 702 else if (isa<CXXDestructorDecl>(NewMethod)) 703 NewDiag = diag::err_destructor_redeclared; 704 else if (isa<CXXConversionDecl>(NewMethod)) 705 NewDiag = diag::err_conv_function_redeclared; 706 else 707 NewDiag = diag::err_member_redeclared; 708 709 Diag(New->getLocation(), NewDiag); 710 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 711 } 712 713 // (C++98 8.3.5p3): 714 // All declarations for a function shall agree exactly in both the 715 // return type and the parameter-type-list. 716 if (OldQType == NewQType) 717 return MergeCompatibleFunctionDecls(New, Old); 718 719 // Fall through for conflicting redeclarations and redefinitions. 720 } 721 722 // C: Function types need to be compatible, not identical. This handles 723 // duplicate function decls like "void f(int); void f(enum X);" properly. 724 if (!getLangOptions().CPlusPlus && 725 Context.typesAreCompatible(OldQType, NewQType)) { 726 const FunctionType *OldFuncType = OldQType->getAsFunctionType(); 727 const FunctionType *NewFuncType = NewQType->getAsFunctionType(); 728 const FunctionProtoType *OldProto = 0; 729 if (isa<FunctionNoProtoType>(NewFuncType) && 730 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) { 731 // The old declaration provided a function prototype, but the 732 // new declaration does not. Merge in the prototype. 733 assert(!OldProto->hasExceptionSpec() && "Exception spec in C"); 734 llvm::SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(), 735 OldProto->arg_type_end()); 736 NewQType = Context.getFunctionType(NewFuncType->getResultType(), 737 ParamTypes.data(), ParamTypes.size(), 738 OldProto->isVariadic(), 739 OldProto->getTypeQuals()); 740 New->setType(NewQType); 741 New->setHasInheritedPrototype(); 742 743 // Synthesize a parameter for each argument type. 744 llvm::SmallVector<ParmVarDecl*, 16> Params; 745 for (FunctionProtoType::arg_type_iterator 746 ParamType = OldProto->arg_type_begin(), 747 ParamEnd = OldProto->arg_type_end(); 748 ParamType != ParamEnd; ++ParamType) { 749 ParmVarDecl *Param = ParmVarDecl::Create(Context, New, 750 SourceLocation(), 0, 751 *ParamType, VarDecl::None, 752 0); 753 Param->setImplicit(); 754 Params.push_back(Param); 755 } 756 757 New->setParams(Context, Params.data(), Params.size()); 758 } 759 760 return MergeCompatibleFunctionDecls(New, Old); 761 } 762 763 // GNU C permits a K&R definition to follow a prototype declaration 764 // if the declared types of the parameters in the K&R definition 765 // match the types in the prototype declaration, even when the 766 // promoted types of the parameters from the K&R definition differ 767 // from the types in the prototype. GCC then keeps the types from 768 // the prototype. 769 // 770 // If a variadic prototype is followed by a non-variadic K&R definition, 771 // the K&R definition becomes variadic. This is sort of an edge case, but 772 // it's legal per the standard depending on how you read C99 6.7.5.3p15 and 773 // C99 6.9.1p8. 774 if (!getLangOptions().CPlusPlus && 775 Old->hasPrototype() && !New->hasPrototype() && 776 New->getType()->getAsFunctionProtoType() && 777 Old->getNumParams() == New->getNumParams()) { 778 llvm::SmallVector<QualType, 16> ArgTypes; 779 llvm::SmallVector<GNUCompatibleParamWarning, 16> Warnings; 780 const FunctionProtoType *OldProto 781 = Old->getType()->getAsFunctionProtoType(); 782 const FunctionProtoType *NewProto 783 = New->getType()->getAsFunctionProtoType(); 784 785 // Determine whether this is the GNU C extension. 786 QualType MergedReturn = Context.mergeTypes(OldProto->getResultType(), 787 NewProto->getResultType()); 788 bool LooseCompatible = !MergedReturn.isNull(); 789 for (unsigned Idx = 0, End = Old->getNumParams(); 790 LooseCompatible && Idx != End; ++Idx) { 791 ParmVarDecl *OldParm = Old->getParamDecl(Idx); 792 ParmVarDecl *NewParm = New->getParamDecl(Idx); 793 if (Context.typesAreCompatible(OldParm->getType(), 794 NewProto->getArgType(Idx))) { 795 ArgTypes.push_back(NewParm->getType()); 796 } else if (Context.typesAreCompatible(OldParm->getType(), 797 NewParm->getType())) { 798 GNUCompatibleParamWarning Warn 799 = { OldParm, NewParm, NewProto->getArgType(Idx) }; 800 Warnings.push_back(Warn); 801 ArgTypes.push_back(NewParm->getType()); 802 } else 803 LooseCompatible = false; 804 } 805 806 if (LooseCompatible) { 807 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) { 808 Diag(Warnings[Warn].NewParm->getLocation(), 809 diag::ext_param_promoted_not_compatible_with_prototype) 810 << Warnings[Warn].PromotedType 811 << Warnings[Warn].OldParm->getType(); 812 Diag(Warnings[Warn].OldParm->getLocation(), 813 diag::note_previous_declaration); 814 } 815 816 New->setType(Context.getFunctionType(MergedReturn, &ArgTypes[0], 817 ArgTypes.size(), 818 OldProto->isVariadic(), 0)); 819 return MergeCompatibleFunctionDecls(New, Old); 820 } 821 822 // Fall through to diagnose conflicting types. 823 } 824 825 // A function that has already been declared has been redeclared or defined 826 // with a different type- show appropriate diagnostic 827 if (unsigned BuiltinID = Old->getBuiltinID(Context)) { 828 // The user has declared a builtin function with an incompatible 829 // signature. 830 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 831 // The function the user is redeclaring is a library-defined 832 // function like 'malloc' or 'printf'. Warn about the 833 // redeclaration, then pretend that we don't know about this 834 // library built-in. 835 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; 836 Diag(Old->getLocation(), diag::note_previous_builtin_declaration) 837 << Old << Old->getType(); 838 New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin); 839 Old->setInvalidDecl(); 840 return false; 841 } 842 843 PrevDiag = diag::note_previous_builtin_declaration; 844 } 845 846 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 847 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 848 return true; 849} 850 851/// \brief Completes the merge of two function declarations that are 852/// known to be compatible. 853/// 854/// This routine handles the merging of attributes and other 855/// properties of function declarations form the old declaration to 856/// the new declaration, once we know that New is in fact a 857/// redeclaration of Old. 858/// 859/// \returns false 860bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old) { 861 // Merge the attributes 862 MergeAttributes(New, Old, Context); 863 864 // Merge the storage class. 865 if (Old->getStorageClass() != FunctionDecl::Extern) 866 New->setStorageClass(Old->getStorageClass()); 867 868 // Merge "inline" 869 if (Old->isInline()) 870 New->setInline(true); 871 872 // If this function declaration by itself qualifies as a C99 inline 873 // definition (C99 6.7.4p6), but the previous definition did not, 874 // then the function is not a C99 inline definition. 875 if (New->isC99InlineDefinition() && !Old->isC99InlineDefinition()) 876 New->setC99InlineDefinition(false); 877 else if (Old->isC99InlineDefinition() && !New->isC99InlineDefinition()) { 878 // Mark all preceding definitions as not being C99 inline definitions. 879 for (const FunctionDecl *Prev = Old; Prev; 880 Prev = Prev->getPreviousDeclaration()) 881 const_cast<FunctionDecl *>(Prev)->setC99InlineDefinition(false); 882 } 883 884 // Merge "pure" flag. 885 if (Old->isPure()) 886 New->setPure(); 887 888 // Merge the "deleted" flag. 889 if (Old->isDeleted()) 890 New->setDeleted(); 891 892 if (getLangOptions().CPlusPlus) 893 return MergeCXXFunctionDecl(New, Old); 894 895 return false; 896} 897 898/// MergeVarDecl - We just parsed a variable 'New' which has the same name 899/// and scope as a previous declaration 'Old'. Figure out how to resolve this 900/// situation, merging decls or emitting diagnostics as appropriate. 901/// 902/// Tentative definition rules (C99 6.9.2p2) are checked by 903/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 904/// definitions here, since the initializer hasn't been attached. 905/// 906void Sema::MergeVarDecl(VarDecl *New, Decl *OldD) { 907 // If either decl is invalid, make sure the new one is marked invalid and 908 // don't do any other checking. 909 if (New->isInvalidDecl() || OldD->isInvalidDecl()) 910 return New->setInvalidDecl(); 911 912 // Verify the old decl was also a variable. 913 VarDecl *Old = dyn_cast<VarDecl>(OldD); 914 if (!Old) { 915 Diag(New->getLocation(), diag::err_redefinition_different_kind) 916 << New->getDeclName(); 917 Diag(OldD->getLocation(), diag::note_previous_definition); 918 return New->setInvalidDecl(); 919 } 920 921 MergeAttributes(New, Old, Context); 922 923 // Merge the types 924 QualType MergedT; 925 if (getLangOptions().CPlusPlus) { 926 if (Context.hasSameType(New->getType(), Old->getType())) 927 MergedT = New->getType(); 928 } else { 929 MergedT = Context.mergeTypes(New->getType(), Old->getType()); 930 } 931 if (MergedT.isNull()) { 932 Diag(New->getLocation(), diag::err_redefinition_different_type) 933 << New->getDeclName(); 934 Diag(Old->getLocation(), diag::note_previous_definition); 935 return New->setInvalidDecl(); 936 } 937 New->setType(MergedT); 938 939 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 940 if (New->getStorageClass() == VarDecl::Static && 941 (Old->getStorageClass() == VarDecl::None || Old->hasExternalStorage())) { 942 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 943 Diag(Old->getLocation(), diag::note_previous_definition); 944 return New->setInvalidDecl(); 945 } 946 // C99 6.2.2p4: 947 // For an identifier declared with the storage-class specifier 948 // extern in a scope in which a prior declaration of that 949 // identifier is visible,23) if the prior declaration specifies 950 // internal or external linkage, the linkage of the identifier at 951 // the later declaration is the same as the linkage specified at 952 // the prior declaration. If no prior declaration is visible, or 953 // if the prior declaration specifies no linkage, then the 954 // identifier has external linkage. 955 if (New->hasExternalStorage() && Old->hasLinkage()) 956 /* Okay */; 957 else if (New->getStorageClass() != VarDecl::Static && 958 Old->getStorageClass() == VarDecl::Static) { 959 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 960 Diag(Old->getLocation(), diag::note_previous_definition); 961 return New->setInvalidDecl(); 962 } 963 964 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 965 966 // FIXME: The test for external storage here seems wrong? We still 967 // need to check for mismatches. 968 if (!New->hasExternalStorage() && !New->isFileVarDecl() && 969 // Don't complain about out-of-line definitions of static members. 970 !(Old->getLexicalDeclContext()->isRecord() && 971 !New->getLexicalDeclContext()->isRecord())) { 972 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 973 Diag(Old->getLocation(), diag::note_previous_definition); 974 return New->setInvalidDecl(); 975 } 976 977 if (New->isThreadSpecified() && !Old->isThreadSpecified()) { 978 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName(); 979 Diag(Old->getLocation(), diag::note_previous_definition); 980 } else if (!New->isThreadSpecified() && Old->isThreadSpecified()) { 981 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName(); 982 Diag(Old->getLocation(), diag::note_previous_definition); 983 } 984 985 // Keep a chain of previous declarations. 986 New->setPreviousDeclaration(Old); 987} 988 989/// CheckParmsForFunctionDef - Check that the parameters of the given 990/// function are appropriate for the definition of a function. This 991/// takes care of any checks that cannot be performed on the 992/// declaration itself, e.g., that the types of each of the function 993/// parameters are complete. 994bool Sema::CheckParmsForFunctionDef(FunctionDecl *FD) { 995 bool HasInvalidParm = false; 996 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 997 ParmVarDecl *Param = FD->getParamDecl(p); 998 999 // C99 6.7.5.3p4: the parameters in a parameter type list in a 1000 // function declarator that is part of a function definition of 1001 // that function shall not have incomplete type. 1002 // 1003 // This is also C++ [dcl.fct]p6. 1004 if (!Param->isInvalidDecl() && 1005 RequireCompleteType(Param->getLocation(), Param->getType(), 1006 diag::err_typecheck_decl_incomplete_type)) { 1007 Param->setInvalidDecl(); 1008 HasInvalidParm = true; 1009 } 1010 1011 // C99 6.9.1p5: If the declarator includes a parameter type list, the 1012 // declaration of each parameter shall include an identifier. 1013 if (Param->getIdentifier() == 0 && 1014 !Param->isImplicit() && 1015 !getLangOptions().CPlusPlus) 1016 Diag(Param->getLocation(), diag::err_parameter_name_omitted); 1017 } 1018 1019 return HasInvalidParm; 1020} 1021 1022/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 1023/// no declarator (e.g. "struct foo;") is parsed. 1024Sema::DeclPtrTy Sema::ParsedFreeStandingDeclSpec(Scope *S, DeclSpec &DS) { 1025 // FIXME: Error on auto/register at file scope 1026 // FIXME: Error on inline/virtual/explicit 1027 // FIXME: Error on invalid restrict 1028 // FIXME: Warn on useless __thread 1029 // FIXME: Warn on useless const/volatile 1030 // FIXME: Warn on useless static/extern/typedef/private_extern/mutable 1031 // FIXME: Warn on useless attributes 1032 TagDecl *Tag = 0; 1033 if (DS.getTypeSpecType() == DeclSpec::TST_class || 1034 DS.getTypeSpecType() == DeclSpec::TST_struct || 1035 DS.getTypeSpecType() == DeclSpec::TST_union || 1036 DS.getTypeSpecType() == DeclSpec::TST_enum) { 1037 if (!DS.getTypeRep()) // We probably had an error 1038 return DeclPtrTy(); 1039 1040 Tag = dyn_cast<TagDecl>(static_cast<Decl *>(DS.getTypeRep())); 1041 } 1042 1043 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 1044 if (!Record->getDeclName() && Record->isDefinition() && 1045 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { 1046 if (getLangOptions().CPlusPlus || 1047 Record->getDeclContext()->isRecord()) 1048 return BuildAnonymousStructOrUnion(S, DS, Record); 1049 1050 Diag(DS.getSourceRange().getBegin(), diag::err_no_declarators) 1051 << DS.getSourceRange(); 1052 } 1053 1054 // Microsoft allows unnamed struct/union fields. Don't complain 1055 // about them. 1056 // FIXME: Should we support Microsoft's extensions in this area? 1057 if (Record->getDeclName() && getLangOptions().Microsoft) 1058 return DeclPtrTy::make(Tag); 1059 } 1060 1061 if (!DS.isMissingDeclaratorOk() && 1062 DS.getTypeSpecType() != DeclSpec::TST_error) { 1063 // Warn about typedefs of enums without names, since this is an 1064 // extension in both Microsoft an GNU. 1065 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 1066 Tag && isa<EnumDecl>(Tag)) { 1067 Diag(DS.getSourceRange().getBegin(), diag::ext_typedef_without_a_name) 1068 << DS.getSourceRange(); 1069 return DeclPtrTy::make(Tag); 1070 } 1071 1072 Diag(DS.getSourceRange().getBegin(), diag::err_no_declarators) 1073 << DS.getSourceRange(); 1074 return DeclPtrTy(); 1075 } 1076 1077 return DeclPtrTy::make(Tag); 1078} 1079 1080/// InjectAnonymousStructOrUnionMembers - Inject the members of the 1081/// anonymous struct or union AnonRecord into the owning context Owner 1082/// and scope S. This routine will be invoked just after we realize 1083/// that an unnamed union or struct is actually an anonymous union or 1084/// struct, e.g., 1085/// 1086/// @code 1087/// union { 1088/// int i; 1089/// float f; 1090/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 1091/// // f into the surrounding scope.x 1092/// @endcode 1093/// 1094/// This routine is recursive, injecting the names of nested anonymous 1095/// structs/unions into the owning context and scope as well. 1096bool Sema::InjectAnonymousStructOrUnionMembers(Scope *S, DeclContext *Owner, 1097 RecordDecl *AnonRecord) { 1098 bool Invalid = false; 1099 for (RecordDecl::field_iterator F = AnonRecord->field_begin(Context), 1100 FEnd = AnonRecord->field_end(Context); 1101 F != FEnd; ++F) { 1102 if ((*F)->getDeclName()) { 1103 NamedDecl *PrevDecl = LookupQualifiedName(Owner, (*F)->getDeclName(), 1104 LookupOrdinaryName, true); 1105 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 1106 // C++ [class.union]p2: 1107 // The names of the members of an anonymous union shall be 1108 // distinct from the names of any other entity in the 1109 // scope in which the anonymous union is declared. 1110 unsigned diagKind 1111 = AnonRecord->isUnion()? diag::err_anonymous_union_member_redecl 1112 : diag::err_anonymous_struct_member_redecl; 1113 Diag((*F)->getLocation(), diagKind) 1114 << (*F)->getDeclName(); 1115 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 1116 Invalid = true; 1117 } else { 1118 // C++ [class.union]p2: 1119 // For the purpose of name lookup, after the anonymous union 1120 // definition, the members of the anonymous union are 1121 // considered to have been defined in the scope in which the 1122 // anonymous union is declared. 1123 Owner->makeDeclVisibleInContext(Context, *F); 1124 S->AddDecl(DeclPtrTy::make(*F)); 1125 IdResolver.AddDecl(*F); 1126 } 1127 } else if (const RecordType *InnerRecordType 1128 = (*F)->getType()->getAsRecordType()) { 1129 RecordDecl *InnerRecord = InnerRecordType->getDecl(); 1130 if (InnerRecord->isAnonymousStructOrUnion()) 1131 Invalid = Invalid || 1132 InjectAnonymousStructOrUnionMembers(S, Owner, InnerRecord); 1133 } 1134 } 1135 1136 return Invalid; 1137} 1138 1139/// ActOnAnonymousStructOrUnion - Handle the declaration of an 1140/// anonymous structure or union. Anonymous unions are a C++ feature 1141/// (C++ [class.union]) and a GNU C extension; anonymous structures 1142/// are a GNU C and GNU C++ extension. 1143Sema::DeclPtrTy Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 1144 RecordDecl *Record) { 1145 DeclContext *Owner = Record->getDeclContext(); 1146 1147 // Diagnose whether this anonymous struct/union is an extension. 1148 if (Record->isUnion() && !getLangOptions().CPlusPlus) 1149 Diag(Record->getLocation(), diag::ext_anonymous_union); 1150 else if (!Record->isUnion()) 1151 Diag(Record->getLocation(), diag::ext_anonymous_struct); 1152 1153 // C and C++ require different kinds of checks for anonymous 1154 // structs/unions. 1155 bool Invalid = false; 1156 if (getLangOptions().CPlusPlus) { 1157 const char* PrevSpec = 0; 1158 // C++ [class.union]p3: 1159 // Anonymous unions declared in a named namespace or in the 1160 // global namespace shall be declared static. 1161 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 1162 (isa<TranslationUnitDecl>(Owner) || 1163 (isa<NamespaceDecl>(Owner) && 1164 cast<NamespaceDecl>(Owner)->getDeclName()))) { 1165 Diag(Record->getLocation(), diag::err_anonymous_union_not_static); 1166 Invalid = true; 1167 1168 // Recover by adding 'static'. 1169 DS.SetStorageClassSpec(DeclSpec::SCS_static, SourceLocation(), PrevSpec); 1170 } 1171 // C++ [class.union]p3: 1172 // A storage class is not allowed in a declaration of an 1173 // anonymous union in a class scope. 1174 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 1175 isa<RecordDecl>(Owner)) { 1176 Diag(DS.getStorageClassSpecLoc(), 1177 diag::err_anonymous_union_with_storage_spec); 1178 Invalid = true; 1179 1180 // Recover by removing the storage specifier. 1181 DS.SetStorageClassSpec(DeclSpec::SCS_unspecified, SourceLocation(), 1182 PrevSpec); 1183 } 1184 1185 // C++ [class.union]p2: 1186 // The member-specification of an anonymous union shall only 1187 // define non-static data members. [Note: nested types and 1188 // functions cannot be declared within an anonymous union. ] 1189 for (DeclContext::decl_iterator Mem = Record->decls_begin(Context), 1190 MemEnd = Record->decls_end(Context); 1191 Mem != MemEnd; ++Mem) { 1192 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 1193 // C++ [class.union]p3: 1194 // An anonymous union shall not have private or protected 1195 // members (clause 11). 1196 if (FD->getAccess() == AS_protected || FD->getAccess() == AS_private) { 1197 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 1198 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 1199 Invalid = true; 1200 } 1201 } else if ((*Mem)->isImplicit()) { 1202 // Any implicit members are fine. 1203 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 1204 // This is a type that showed up in an 1205 // elaborated-type-specifier inside the anonymous struct or 1206 // union, but which actually declares a type outside of the 1207 // anonymous struct or union. It's okay. 1208 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 1209 if (!MemRecord->isAnonymousStructOrUnion() && 1210 MemRecord->getDeclName()) { 1211 // This is a nested type declaration. 1212 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 1213 << (int)Record->isUnion(); 1214 Invalid = true; 1215 } 1216 } else { 1217 // We have something that isn't a non-static data 1218 // member. Complain about it. 1219 unsigned DK = diag::err_anonymous_record_bad_member; 1220 if (isa<TypeDecl>(*Mem)) 1221 DK = diag::err_anonymous_record_with_type; 1222 else if (isa<FunctionDecl>(*Mem)) 1223 DK = diag::err_anonymous_record_with_function; 1224 else if (isa<VarDecl>(*Mem)) 1225 DK = diag::err_anonymous_record_with_static; 1226 Diag((*Mem)->getLocation(), DK) 1227 << (int)Record->isUnion(); 1228 Invalid = true; 1229 } 1230 } 1231 } 1232 1233 if (!Record->isUnion() && !Owner->isRecord()) { 1234 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 1235 << (int)getLangOptions().CPlusPlus; 1236 Invalid = true; 1237 } 1238 1239 // Create a declaration for this anonymous struct/union. 1240 NamedDecl *Anon = 0; 1241 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 1242 Anon = FieldDecl::Create(Context, OwningClass, Record->getLocation(), 1243 /*IdentifierInfo=*/0, 1244 Context.getTypeDeclType(Record), 1245 /*BitWidth=*/0, /*Mutable=*/false); 1246 Anon->setAccess(AS_public); 1247 if (getLangOptions().CPlusPlus) 1248 FieldCollector->Add(cast<FieldDecl>(Anon)); 1249 } else { 1250 VarDecl::StorageClass SC; 1251 switch (DS.getStorageClassSpec()) { 1252 default: assert(0 && "Unknown storage class!"); 1253 case DeclSpec::SCS_unspecified: SC = VarDecl::None; break; 1254 case DeclSpec::SCS_extern: SC = VarDecl::Extern; break; 1255 case DeclSpec::SCS_static: SC = VarDecl::Static; break; 1256 case DeclSpec::SCS_auto: SC = VarDecl::Auto; break; 1257 case DeclSpec::SCS_register: SC = VarDecl::Register; break; 1258 case DeclSpec::SCS_private_extern: SC = VarDecl::PrivateExtern; break; 1259 case DeclSpec::SCS_mutable: 1260 // mutable can only appear on non-static class members, so it's always 1261 // an error here 1262 Diag(Record->getLocation(), diag::err_mutable_nonmember); 1263 Invalid = true; 1264 SC = VarDecl::None; 1265 break; 1266 } 1267 1268 Anon = VarDecl::Create(Context, Owner, Record->getLocation(), 1269 /*IdentifierInfo=*/0, 1270 Context.getTypeDeclType(Record), 1271 SC, DS.getSourceRange().getBegin()); 1272 } 1273 Anon->setImplicit(); 1274 1275 // Add the anonymous struct/union object to the current 1276 // context. We'll be referencing this object when we refer to one of 1277 // its members. 1278 Owner->addDecl(Context, Anon); 1279 1280 // Inject the members of the anonymous struct/union into the owning 1281 // context and into the identifier resolver chain for name lookup 1282 // purposes. 1283 if (InjectAnonymousStructOrUnionMembers(S, Owner, Record)) 1284 Invalid = true; 1285 1286 // Mark this as an anonymous struct/union type. Note that we do not 1287 // do this until after we have already checked and injected the 1288 // members of this anonymous struct/union type, because otherwise 1289 // the members could be injected twice: once by DeclContext when it 1290 // builds its lookup table, and once by 1291 // InjectAnonymousStructOrUnionMembers. 1292 Record->setAnonymousStructOrUnion(true); 1293 1294 if (Invalid) 1295 Anon->setInvalidDecl(); 1296 1297 return DeclPtrTy::make(Anon); 1298} 1299 1300 1301/// GetNameForDeclarator - Determine the full declaration name for the 1302/// given Declarator. 1303DeclarationName Sema::GetNameForDeclarator(Declarator &D) { 1304 switch (D.getKind()) { 1305 case Declarator::DK_Abstract: 1306 assert(D.getIdentifier() == 0 && "abstract declarators have no name"); 1307 return DeclarationName(); 1308 1309 case Declarator::DK_Normal: 1310 assert (D.getIdentifier() != 0 && "normal declarators have an identifier"); 1311 return DeclarationName(D.getIdentifier()); 1312 1313 case Declarator::DK_Constructor: { 1314 QualType Ty = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1315 Ty = Context.getCanonicalType(Ty); 1316 return Context.DeclarationNames.getCXXConstructorName(Ty); 1317 } 1318 1319 case Declarator::DK_Destructor: { 1320 QualType Ty = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1321 Ty = Context.getCanonicalType(Ty); 1322 return Context.DeclarationNames.getCXXDestructorName(Ty); 1323 } 1324 1325 case Declarator::DK_Conversion: { 1326 // FIXME: We'd like to keep the non-canonical type for diagnostics! 1327 QualType Ty = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1328 Ty = Context.getCanonicalType(Ty); 1329 return Context.DeclarationNames.getCXXConversionFunctionName(Ty); 1330 } 1331 1332 case Declarator::DK_Operator: 1333 assert(D.getIdentifier() == 0 && "operator names have no identifier"); 1334 return Context.DeclarationNames.getCXXOperatorName( 1335 D.getOverloadedOperator()); 1336 } 1337 1338 assert(false && "Unknown name kind"); 1339 return DeclarationName(); 1340} 1341 1342/// isNearlyMatchingFunction - Determine whether the C++ functions 1343/// Declaration and Definition are "nearly" matching. This heuristic 1344/// is used to improve diagnostics in the case where an out-of-line 1345/// function definition doesn't match any declaration within 1346/// the class or namespace. 1347static bool isNearlyMatchingFunction(ASTContext &Context, 1348 FunctionDecl *Declaration, 1349 FunctionDecl *Definition) { 1350 if (Declaration->param_size() != Definition->param_size()) 1351 return false; 1352 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 1353 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 1354 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 1355 1356 DeclParamTy = Context.getCanonicalType(DeclParamTy.getNonReferenceType()); 1357 DefParamTy = Context.getCanonicalType(DefParamTy.getNonReferenceType()); 1358 if (DeclParamTy.getUnqualifiedType() != DefParamTy.getUnqualifiedType()) 1359 return false; 1360 } 1361 1362 return true; 1363} 1364 1365Sema::DeclPtrTy 1366Sema::ActOnDeclarator(Scope *S, Declarator &D, bool IsFunctionDefinition) { 1367 DeclarationName Name = GetNameForDeclarator(D); 1368 1369 // All of these full declarators require an identifier. If it doesn't have 1370 // one, the ParsedFreeStandingDeclSpec action should be used. 1371 if (!Name) { 1372 if (!D.isInvalidType()) // Reject this if we think it is valid. 1373 Diag(D.getDeclSpec().getSourceRange().getBegin(), 1374 diag::err_declarator_need_ident) 1375 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 1376 return DeclPtrTy(); 1377 } 1378 1379 // The scope passed in may not be a decl scope. Zip up the scope tree until 1380 // we find one that is. 1381 while ((S->getFlags() & Scope::DeclScope) == 0 || 1382 (S->getFlags() & Scope::TemplateParamScope) != 0) 1383 S = S->getParent(); 1384 1385 DeclContext *DC; 1386 NamedDecl *PrevDecl; 1387 NamedDecl *New; 1388 1389 QualType R = GetTypeForDeclarator(D, S); 1390 1391 // See if this is a redefinition of a variable in the same scope. 1392 if (D.getCXXScopeSpec().isInvalid()) { 1393 DC = CurContext; 1394 PrevDecl = 0; 1395 D.setInvalidType(); 1396 } else if (!D.getCXXScopeSpec().isSet()) { 1397 LookupNameKind NameKind = LookupOrdinaryName; 1398 1399 // If the declaration we're planning to build will be a function 1400 // or object with linkage, then look for another declaration with 1401 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 1402 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 1403 /* Do nothing*/; 1404 else if (R->isFunctionType()) { 1405 if (CurContext->isFunctionOrMethod()) 1406 NameKind = LookupRedeclarationWithLinkage; 1407 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 1408 NameKind = LookupRedeclarationWithLinkage; 1409 1410 DC = CurContext; 1411 PrevDecl = LookupName(S, Name, NameKind, true, 1412 D.getDeclSpec().getStorageClassSpec() != 1413 DeclSpec::SCS_static, 1414 D.getIdentifierLoc()); 1415 } else { // Something like "int foo::x;" 1416 DC = computeDeclContext(D.getCXXScopeSpec()); 1417 // FIXME: RequireCompleteDeclContext(D.getCXXScopeSpec()); ? 1418 PrevDecl = LookupQualifiedName(DC, Name, LookupOrdinaryName, true); 1419 1420 // C++ 7.3.1.2p2: 1421 // Members (including explicit specializations of templates) of a named 1422 // namespace can also be defined outside that namespace by explicit 1423 // qualification of the name being defined, provided that the entity being 1424 // defined was already declared in the namespace and the definition appears 1425 // after the point of declaration in a namespace that encloses the 1426 // declarations namespace. 1427 // 1428 // Note that we only check the context at this point. We don't yet 1429 // have enough information to make sure that PrevDecl is actually 1430 // the declaration we want to match. For example, given: 1431 // 1432 // class X { 1433 // void f(); 1434 // void f(float); 1435 // }; 1436 // 1437 // void X::f(int) { } // ill-formed 1438 // 1439 // In this case, PrevDecl will point to the overload set 1440 // containing the two f's declared in X, but neither of them 1441 // matches. 1442 1443 // First check whether we named the global scope. 1444 if (isa<TranslationUnitDecl>(DC)) { 1445 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 1446 << Name << D.getCXXScopeSpec().getRange(); 1447 } else if (!CurContext->Encloses(DC)) { 1448 // The qualifying scope doesn't enclose the original declaration. 1449 // Emit diagnostic based on current scope. 1450 SourceLocation L = D.getIdentifierLoc(); 1451 SourceRange R = D.getCXXScopeSpec().getRange(); 1452 if (isa<FunctionDecl>(CurContext)) 1453 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 1454 else 1455 Diag(L, diag::err_invalid_declarator_scope) 1456 << Name << cast<NamedDecl>(DC) << R; 1457 D.setInvalidType(); 1458 } 1459 } 1460 1461 if (PrevDecl && PrevDecl->isTemplateParameter()) { 1462 // Maybe we will complain about the shadowed template parameter. 1463 if (!D.isInvalidType()) 1464 if (DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl)) 1465 D.setInvalidType(); 1466 1467 // Just pretend that we didn't see the previous declaration. 1468 PrevDecl = 0; 1469 } 1470 1471 // In C++, the previous declaration we find might be a tag type 1472 // (class or enum). In this case, the new declaration will hide the 1473 // tag type. Note that this does does not apply if we're declaring a 1474 // typedef (C++ [dcl.typedef]p4). 1475 if (PrevDecl && PrevDecl->getIdentifierNamespace() == Decl::IDNS_Tag && 1476 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 1477 PrevDecl = 0; 1478 1479 bool Redeclaration = false; 1480 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 1481 New = ActOnTypedefDeclarator(S, D, DC, R, PrevDecl, Redeclaration); 1482 } else if (R->isFunctionType()) { 1483 New = ActOnFunctionDeclarator(S, D, DC, R, PrevDecl, 1484 IsFunctionDefinition, Redeclaration); 1485 } else { 1486 New = ActOnVariableDeclarator(S, D, DC, R, PrevDecl, Redeclaration); 1487 } 1488 1489 if (New == 0) 1490 return DeclPtrTy(); 1491 1492 // If this has an identifier and is not an invalid redeclaration, 1493 // add it to the scope stack. 1494 if (Name && !(Redeclaration && New->isInvalidDecl())) 1495 PushOnScopeChains(New, S); 1496 1497 return DeclPtrTy::make(New); 1498} 1499 1500/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 1501/// types into constant array types in certain situations which would otherwise 1502/// be errors (for GCC compatibility). 1503static QualType TryToFixInvalidVariablyModifiedType(QualType T, 1504 ASTContext &Context, 1505 bool &SizeIsNegative) { 1506 // This method tries to turn a variable array into a constant 1507 // array even when the size isn't an ICE. This is necessary 1508 // for compatibility with code that depends on gcc's buggy 1509 // constant expression folding, like struct {char x[(int)(char*)2];} 1510 SizeIsNegative = false; 1511 1512 if (const PointerType* PTy = dyn_cast<PointerType>(T)) { 1513 QualType Pointee = PTy->getPointeeType(); 1514 QualType FixedType = 1515 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative); 1516 if (FixedType.isNull()) return FixedType; 1517 FixedType = Context.getPointerType(FixedType); 1518 FixedType.setCVRQualifiers(T.getCVRQualifiers()); 1519 return FixedType; 1520 } 1521 1522 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 1523 if (!VLATy) 1524 return QualType(); 1525 // FIXME: We should probably handle this case 1526 if (VLATy->getElementType()->isVariablyModifiedType()) 1527 return QualType(); 1528 1529 Expr::EvalResult EvalResult; 1530 if (!VLATy->getSizeExpr() || 1531 !VLATy->getSizeExpr()->Evaluate(EvalResult, Context) || 1532 !EvalResult.Val.isInt()) 1533 return QualType(); 1534 1535 llvm::APSInt &Res = EvalResult.Val.getInt(); 1536 if (Res >= llvm::APSInt(Res.getBitWidth(), Res.isUnsigned())) 1537 return Context.getConstantArrayType(VLATy->getElementType(), 1538 Res, ArrayType::Normal, 0); 1539 1540 SizeIsNegative = true; 1541 return QualType(); 1542} 1543 1544/// \brief Register the given locally-scoped external C declaration so 1545/// that it can be found later for redeclarations 1546void 1547Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, NamedDecl *PrevDecl, 1548 Scope *S) { 1549 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 1550 "Decl is not a locally-scoped decl!"); 1551 // Note that we have a locally-scoped external with this name. 1552 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 1553 1554 if (!PrevDecl) 1555 return; 1556 1557 // If there was a previous declaration of this variable, it may be 1558 // in our identifier chain. Update the identifier chain with the new 1559 // declaration. 1560 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 1561 // The previous declaration was found on the identifer resolver 1562 // chain, so remove it from its scope. 1563 while (S && !S->isDeclScope(DeclPtrTy::make(PrevDecl))) 1564 S = S->getParent(); 1565 1566 if (S) 1567 S->RemoveDecl(DeclPtrTy::make(PrevDecl)); 1568 } 1569} 1570 1571/// \brief Diagnose function specifiers on a declaration of an identifier that 1572/// does not identify a function. 1573void Sema::DiagnoseFunctionSpecifiers(Declarator& D) { 1574 // FIXME: We should probably indicate the identifier in question to avoid 1575 // confusion for constructs like "inline int a(), b;" 1576 if (D.getDeclSpec().isInlineSpecified()) 1577 Diag(D.getDeclSpec().getInlineSpecLoc(), 1578 diag::err_inline_non_function); 1579 1580 if (D.getDeclSpec().isVirtualSpecified()) 1581 Diag(D.getDeclSpec().getVirtualSpecLoc(), 1582 diag::err_virtual_non_function); 1583 1584 if (D.getDeclSpec().isExplicitSpecified()) 1585 Diag(D.getDeclSpec().getExplicitSpecLoc(), 1586 diag::err_explicit_non_function); 1587} 1588 1589NamedDecl* 1590Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 1591 QualType R, Decl* PrevDecl, bool &Redeclaration) { 1592 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 1593 if (D.getCXXScopeSpec().isSet()) { 1594 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 1595 << D.getCXXScopeSpec().getRange(); 1596 D.setInvalidType(); 1597 // Pretend we didn't see the scope specifier. 1598 DC = 0; 1599 } 1600 1601 if (getLangOptions().CPlusPlus) { 1602 // Check that there are no default arguments (C++ only). 1603 CheckExtraCXXDefaultArguments(D); 1604 } 1605 1606 DiagnoseFunctionSpecifiers(D); 1607 1608 if (D.getDeclSpec().isThreadSpecified()) 1609 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 1610 1611 TypedefDecl *NewTD = ParseTypedefDecl(S, D, R); 1612 if (!NewTD) return 0; 1613 1614 if (D.isInvalidType()) 1615 NewTD->setInvalidDecl(); 1616 1617 // Handle attributes prior to checking for duplicates in MergeVarDecl 1618 ProcessDeclAttributes(NewTD, D); 1619 // Merge the decl with the existing one if appropriate. If the decl is 1620 // in an outer scope, it isn't the same thing. 1621 if (PrevDecl && isDeclInScope(PrevDecl, DC, S)) { 1622 Redeclaration = true; 1623 MergeTypeDefDecl(NewTD, PrevDecl); 1624 } 1625 1626 // C99 6.7.7p2: If a typedef name specifies a variably modified type 1627 // then it shall have block scope. 1628 QualType T = NewTD->getUnderlyingType(); 1629 if (T->isVariablyModifiedType()) { 1630 CurFunctionNeedsScopeChecking = true; 1631 1632 if (S->getFnParent() == 0) { 1633 bool SizeIsNegative; 1634 QualType FixedTy = 1635 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative); 1636 if (!FixedTy.isNull()) { 1637 Diag(D.getIdentifierLoc(), diag::warn_illegal_constant_array_size); 1638 NewTD->setUnderlyingType(FixedTy); 1639 } else { 1640 if (SizeIsNegative) 1641 Diag(D.getIdentifierLoc(), diag::err_typecheck_negative_array_size); 1642 else if (T->isVariableArrayType()) 1643 Diag(D.getIdentifierLoc(), diag::err_vla_decl_in_file_scope); 1644 else 1645 Diag(D.getIdentifierLoc(), diag::err_vm_decl_in_file_scope); 1646 NewTD->setInvalidDecl(); 1647 } 1648 } 1649 } 1650 return NewTD; 1651} 1652 1653/// \brief Determines whether the given declaration is an out-of-scope 1654/// previous declaration. 1655/// 1656/// This routine should be invoked when name lookup has found a 1657/// previous declaration (PrevDecl) that is not in the scope where a 1658/// new declaration by the same name is being introduced. If the new 1659/// declaration occurs in a local scope, previous declarations with 1660/// linkage may still be considered previous declarations (C99 1661/// 6.2.2p4-5, C++ [basic.link]p6). 1662/// 1663/// \param PrevDecl the previous declaration found by name 1664/// lookup 1665/// 1666/// \param DC the context in which the new declaration is being 1667/// declared. 1668/// 1669/// \returns true if PrevDecl is an out-of-scope previous declaration 1670/// for a new delcaration with the same name. 1671static bool 1672isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 1673 ASTContext &Context) { 1674 if (!PrevDecl) 1675 return 0; 1676 1677 // FIXME: PrevDecl could be an OverloadedFunctionDecl, in which 1678 // case we need to check each of the overloaded functions. 1679 if (!PrevDecl->hasLinkage()) 1680 return false; 1681 1682 if (Context.getLangOptions().CPlusPlus) { 1683 // C++ [basic.link]p6: 1684 // If there is a visible declaration of an entity with linkage 1685 // having the same name and type, ignoring entities declared 1686 // outside the innermost enclosing namespace scope, the block 1687 // scope declaration declares that same entity and receives the 1688 // linkage of the previous declaration. 1689 DeclContext *OuterContext = DC->getLookupContext(); 1690 if (!OuterContext->isFunctionOrMethod()) 1691 // This rule only applies to block-scope declarations. 1692 return false; 1693 else { 1694 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 1695 if (PrevOuterContext->isRecord()) 1696 // We found a member function: ignore it. 1697 return false; 1698 else { 1699 // Find the innermost enclosing namespace for the new and 1700 // previous declarations. 1701 while (!OuterContext->isFileContext()) 1702 OuterContext = OuterContext->getParent(); 1703 while (!PrevOuterContext->isFileContext()) 1704 PrevOuterContext = PrevOuterContext->getParent(); 1705 1706 // The previous declaration is in a different namespace, so it 1707 // isn't the same function. 1708 if (OuterContext->getPrimaryContext() != 1709 PrevOuterContext->getPrimaryContext()) 1710 return false; 1711 } 1712 } 1713 } 1714 1715 return true; 1716} 1717 1718NamedDecl* 1719Sema::ActOnVariableDeclarator(Scope* S, Declarator& D, DeclContext* DC, 1720 QualType R,NamedDecl* PrevDecl, 1721 bool &Redeclaration) { 1722 DeclarationName Name = GetNameForDeclarator(D); 1723 1724 // Check that there are no default arguments (C++ only). 1725 if (getLangOptions().CPlusPlus) 1726 CheckExtraCXXDefaultArguments(D); 1727 1728 VarDecl *NewVD; 1729 VarDecl::StorageClass SC; 1730 switch (D.getDeclSpec().getStorageClassSpec()) { 1731 default: assert(0 && "Unknown storage class!"); 1732 case DeclSpec::SCS_unspecified: SC = VarDecl::None; break; 1733 case DeclSpec::SCS_extern: SC = VarDecl::Extern; break; 1734 case DeclSpec::SCS_static: SC = VarDecl::Static; break; 1735 case DeclSpec::SCS_auto: SC = VarDecl::Auto; break; 1736 case DeclSpec::SCS_register: SC = VarDecl::Register; break; 1737 case DeclSpec::SCS_private_extern: SC = VarDecl::PrivateExtern; break; 1738 case DeclSpec::SCS_mutable: 1739 // mutable can only appear on non-static class members, so it's always 1740 // an error here 1741 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 1742 D.setInvalidType(); 1743 SC = VarDecl::None; 1744 break; 1745 } 1746 1747 IdentifierInfo *II = Name.getAsIdentifierInfo(); 1748 if (!II) { 1749 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 1750 << Name.getAsString(); 1751 return 0; 1752 } 1753 1754 DiagnoseFunctionSpecifiers(D); 1755 1756 if (!DC->isRecord() && S->getFnParent() == 0) { 1757 // C99 6.9p2: The storage-class specifiers auto and register shall not 1758 // appear in the declaration specifiers in an external declaration. 1759 if (SC == VarDecl::Auto || SC == VarDecl::Register) { 1760 1761 // If this is a register variable with an asm label specified, then this 1762 // is a GNU extension. 1763 if (SC == VarDecl::Register && D.getAsmLabel()) 1764 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register); 1765 else 1766 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 1767 D.setInvalidType(); 1768 } 1769 } 1770 if (DC->isRecord() && !CurContext->isRecord()) { 1771 // This is an out-of-line definition of a static data member. 1772 if (SC == VarDecl::Static) { 1773 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 1774 diag::err_static_out_of_line) 1775 << CodeModificationHint::CreateRemoval( 1776 SourceRange(D.getDeclSpec().getStorageClassSpecLoc())); 1777 } else if (SC == VarDecl::None) 1778 SC = VarDecl::Static; 1779 } 1780 1781 // The variable can not 1782 NewVD = VarDecl::Create(Context, DC, D.getIdentifierLoc(), 1783 II, R, SC, 1784 // FIXME: Move to DeclGroup... 1785 D.getDeclSpec().getSourceRange().getBegin()); 1786 1787 if (D.isInvalidType()) 1788 NewVD->setInvalidDecl(); 1789 1790 if (D.getDeclSpec().isThreadSpecified()) { 1791 if (NewVD->hasLocalStorage()) 1792 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global); 1793 else if (!Context.Target.isTLSSupported()) 1794 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported); 1795 else 1796 NewVD->setThreadSpecified(true); 1797 } 1798 1799 // Set the lexical context. If the declarator has a C++ scope specifier, the 1800 // lexical context will be different from the semantic context. 1801 NewVD->setLexicalDeclContext(CurContext); 1802 1803 // Handle attributes prior to checking for duplicates in MergeVarDecl 1804 ProcessDeclAttributes(NewVD, D); 1805 1806 // Handle GNU asm-label extension (encoded as an attribute). 1807 if (Expr *E = (Expr*) D.getAsmLabel()) { 1808 // The parser guarantees this is a string. 1809 StringLiteral *SE = cast<StringLiteral>(E); 1810 NewVD->addAttr(::new (Context) AsmLabelAttr(std::string(SE->getStrData(), 1811 SE->getByteLength()))); 1812 } 1813 1814 // If name lookup finds a previous declaration that is not in the 1815 // same scope as the new declaration, this may still be an 1816 // acceptable redeclaration. 1817 if (PrevDecl && !isDeclInScope(PrevDecl, DC, S) && 1818 !(NewVD->hasLinkage() && 1819 isOutOfScopePreviousDeclaration(PrevDecl, DC, Context))) 1820 PrevDecl = 0; 1821 1822 // Merge the decl with the existing one if appropriate. 1823 if (PrevDecl) { 1824 if (isa<FieldDecl>(PrevDecl) && D.getCXXScopeSpec().isSet()) { 1825 // The user tried to define a non-static data member 1826 // out-of-line (C++ [dcl.meaning]p1). 1827 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 1828 << D.getCXXScopeSpec().getRange(); 1829 PrevDecl = 0; 1830 NewVD->setInvalidDecl(); 1831 } 1832 } else if (D.getCXXScopeSpec().isSet()) { 1833 // No previous declaration in the qualifying scope. 1834 Diag(D.getIdentifierLoc(), diag::err_typecheck_no_member) 1835 << Name << D.getCXXScopeSpec().getRange(); 1836 NewVD->setInvalidDecl(); 1837 } 1838 1839 CheckVariableDeclaration(NewVD, PrevDecl, Redeclaration); 1840 1841 // If this is a locally-scoped extern C variable, update the map of 1842 // such variables. 1843 if (CurContext->isFunctionOrMethod() && NewVD->isExternC(Context) && 1844 !NewVD->isInvalidDecl()) 1845 RegisterLocallyScopedExternCDecl(NewVD, PrevDecl, S); 1846 1847 return NewVD; 1848} 1849 1850/// \brief Perform semantic checking on a newly-created variable 1851/// declaration. 1852/// 1853/// This routine performs all of the type-checking required for a 1854/// variable declaration once it has been built. It is used both to 1855/// check variables after they have been parsed and their declarators 1856/// have been translated into a declaration, and to check variables 1857/// that have been instantiated from a template. 1858/// 1859/// Sets NewVD->isInvalidDecl() if an error was encountered. 1860void Sema::CheckVariableDeclaration(VarDecl *NewVD, NamedDecl *PrevDecl, 1861 bool &Redeclaration) { 1862 // If the decl is already known invalid, don't check it. 1863 if (NewVD->isInvalidDecl()) 1864 return; 1865 1866 QualType T = NewVD->getType(); 1867 1868 if (T->isObjCInterfaceType()) { 1869 Diag(NewVD->getLocation(), diag::err_statically_allocated_object); 1870 return NewVD->setInvalidDecl(); 1871 } 1872 1873 // The variable can not have an abstract class type. 1874 if (RequireNonAbstractType(NewVD->getLocation(), T, 1875 diag::err_abstract_type_in_decl, 1876 AbstractVariableType)) 1877 return NewVD->setInvalidDecl(); 1878 1879 // Emit an error if an address space was applied to decl with local storage. 1880 // This includes arrays of objects with address space qualifiers, but not 1881 // automatic variables that point to other address spaces. 1882 // ISO/IEC TR 18037 S5.1.2 1883 if (NewVD->hasLocalStorage() && (T.getAddressSpace() != 0)) { 1884 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 1885 return NewVD->setInvalidDecl(); 1886 } 1887 1888 if (NewVD->hasLocalStorage() && T.isObjCGCWeak() 1889 && !NewVD->hasAttr<BlocksAttr>()) 1890 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 1891 1892 bool isVM = T->isVariablyModifiedType(); 1893 if (isVM || NewVD->hasAttr<CleanupAttr>()) 1894 CurFunctionNeedsScopeChecking = true; 1895 1896 if ((isVM && NewVD->hasLinkage()) || 1897 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { 1898 bool SizeIsNegative; 1899 QualType FixedTy = 1900 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative); 1901 1902 if (FixedTy.isNull() && T->isVariableArrayType()) { 1903 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 1904 // FIXME: This won't give the correct result for 1905 // int a[10][n]; 1906 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 1907 1908 if (NewVD->isFileVarDecl()) 1909 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 1910 << SizeRange; 1911 else if (NewVD->getStorageClass() == VarDecl::Static) 1912 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 1913 << SizeRange; 1914 else 1915 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 1916 << SizeRange; 1917 return NewVD->setInvalidDecl(); 1918 } 1919 1920 if (FixedTy.isNull()) { 1921 if (NewVD->isFileVarDecl()) 1922 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 1923 else 1924 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 1925 return NewVD->setInvalidDecl(); 1926 } 1927 1928 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 1929 NewVD->setType(FixedTy); 1930 } 1931 1932 if (!PrevDecl && NewVD->isExternC(Context)) { 1933 // Since we did not find anything by this name and we're declaring 1934 // an extern "C" variable, look for a non-visible extern "C" 1935 // declaration with the same name. 1936 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 1937 = LocallyScopedExternalDecls.find(NewVD->getDeclName()); 1938 if (Pos != LocallyScopedExternalDecls.end()) 1939 PrevDecl = Pos->second; 1940 } 1941 1942 if (T->isVoidType() && !NewVD->hasExternalStorage()) { 1943 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 1944 << T; 1945 return NewVD->setInvalidDecl(); 1946 } 1947 1948 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { 1949 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); 1950 return NewVD->setInvalidDecl(); 1951 } 1952 1953 if (isVM && NewVD->hasAttr<BlocksAttr>()) { 1954 Diag(NewVD->getLocation(), diag::err_block_on_vm); 1955 return NewVD->setInvalidDecl(); 1956 } 1957 1958 if (PrevDecl) { 1959 Redeclaration = true; 1960 MergeVarDecl(NewVD, PrevDecl); 1961 } 1962} 1963 1964NamedDecl* 1965Sema::ActOnFunctionDeclarator(Scope* S, Declarator& D, DeclContext* DC, 1966 QualType R, NamedDecl* PrevDecl, 1967 bool IsFunctionDefinition, bool &Redeclaration) { 1968 assert(R.getTypePtr()->isFunctionType()); 1969 1970 DeclarationName Name = GetNameForDeclarator(D); 1971 FunctionDecl::StorageClass SC = FunctionDecl::None; 1972 switch (D.getDeclSpec().getStorageClassSpec()) { 1973 default: assert(0 && "Unknown storage class!"); 1974 case DeclSpec::SCS_auto: 1975 case DeclSpec::SCS_register: 1976 case DeclSpec::SCS_mutable: 1977 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 1978 diag::err_typecheck_sclass_func); 1979 D.setInvalidType(); 1980 break; 1981 case DeclSpec::SCS_unspecified: SC = FunctionDecl::None; break; 1982 case DeclSpec::SCS_extern: SC = FunctionDecl::Extern; break; 1983 case DeclSpec::SCS_static: { 1984 if (CurContext->getLookupContext()->isFunctionOrMethod()) { 1985 // C99 6.7.1p5: 1986 // The declaration of an identifier for a function that has 1987 // block scope shall have no explicit storage-class specifier 1988 // other than extern 1989 // See also (C++ [dcl.stc]p4). 1990 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 1991 diag::err_static_block_func); 1992 SC = FunctionDecl::None; 1993 } else 1994 SC = FunctionDecl::Static; 1995 break; 1996 } 1997 case DeclSpec::SCS_private_extern: SC = FunctionDecl::PrivateExtern;break; 1998 } 1999 2000 if (D.getDeclSpec().isThreadSpecified()) 2001 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 2002 2003 bool isInline = D.getDeclSpec().isInlineSpecified(); 2004 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2005 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 2006 2007 // Check that the return type is not an abstract class type. 2008 // For record types, this is done by the AbstractClassUsageDiagnoser once 2009 // the class has been completely parsed. 2010 if (!DC->isRecord() && 2011 RequireNonAbstractType(D.getIdentifierLoc(), 2012 R->getAsFunctionType()->getResultType(), 2013 diag::err_abstract_type_in_decl, 2014 AbstractReturnType)) 2015 D.setInvalidType(); 2016 2017 // Do not allow returning a objc interface by-value. 2018 if (R->getAsFunctionType()->getResultType()->isObjCInterfaceType()) { 2019 Diag(D.getIdentifierLoc(), 2020 diag::err_object_cannot_be_passed_returned_by_value) << 0 2021 << R->getAsFunctionType()->getResultType(); 2022 D.setInvalidType(); 2023 } 2024 2025 bool isVirtualOkay = false; 2026 FunctionDecl *NewFD; 2027 if (D.getKind() == Declarator::DK_Constructor) { 2028 // This is a C++ constructor declaration. 2029 assert(DC->isRecord() && 2030 "Constructors can only be declared in a member context"); 2031 2032 R = CheckConstructorDeclarator(D, R, SC); 2033 2034 // Create the new declaration 2035 NewFD = CXXConstructorDecl::Create(Context, 2036 cast<CXXRecordDecl>(DC), 2037 D.getIdentifierLoc(), Name, R, 2038 isExplicit, isInline, 2039 /*isImplicitlyDeclared=*/false); 2040 } else if (D.getKind() == Declarator::DK_Destructor) { 2041 // This is a C++ destructor declaration. 2042 if (DC->isRecord()) { 2043 R = CheckDestructorDeclarator(D, SC); 2044 2045 NewFD = CXXDestructorDecl::Create(Context, 2046 cast<CXXRecordDecl>(DC), 2047 D.getIdentifierLoc(), Name, R, 2048 isInline, 2049 /*isImplicitlyDeclared=*/false); 2050 2051 isVirtualOkay = true; 2052 } else { 2053 Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 2054 2055 // Create a FunctionDecl to satisfy the function definition parsing 2056 // code path. 2057 NewFD = FunctionDecl::Create(Context, DC, D.getIdentifierLoc(), 2058 Name, R, SC, isInline, 2059 /*hasPrototype=*/true, 2060 // FIXME: Move to DeclGroup... 2061 D.getDeclSpec().getSourceRange().getBegin()); 2062 D.setInvalidType(); 2063 } 2064 } else if (D.getKind() == Declarator::DK_Conversion) { 2065 if (!DC->isRecord()) { 2066 Diag(D.getIdentifierLoc(), 2067 diag::err_conv_function_not_member); 2068 return 0; 2069 } 2070 2071 CheckConversionDeclarator(D, R, SC); 2072 NewFD = CXXConversionDecl::Create(Context, cast<CXXRecordDecl>(DC), 2073 D.getIdentifierLoc(), Name, R, 2074 isInline, isExplicit); 2075 2076 isVirtualOkay = true; 2077 } else if (DC->isRecord()) { 2078 // If the of the function is the same as the name of the record, then this 2079 // must be an invalid constructor that has a return type. 2080 // (The parser checks for a return type and makes the declarator a 2081 // constructor if it has no return type). 2082 // must have an invalid constructor that has a return type 2083 if (Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ 2084 Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 2085 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2086 << SourceRange(D.getIdentifierLoc()); 2087 return 0; 2088 } 2089 2090 // This is a C++ method declaration. 2091 NewFD = CXXMethodDecl::Create(Context, cast<CXXRecordDecl>(DC), 2092 D.getIdentifierLoc(), Name, R, 2093 (SC == FunctionDecl::Static), isInline); 2094 2095 isVirtualOkay = (SC != FunctionDecl::Static); 2096 } else { 2097 // Determine whether the function was written with a 2098 // prototype. This true when: 2099 // - we're in C++ (where every function has a prototype), 2100 // - there is a prototype in the declarator, or 2101 // - the type R of the function is some kind of typedef or other reference 2102 // to a type name (which eventually refers to a function type). 2103 bool HasPrototype = 2104 getLangOptions().CPlusPlus || 2105 (D.getNumTypeObjects() && D.getTypeObject(0).Fun.hasPrototype) || 2106 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 2107 2108 NewFD = FunctionDecl::Create(Context, DC, 2109 D.getIdentifierLoc(), 2110 Name, R, SC, isInline, HasPrototype, 2111 // FIXME: Move to DeclGroup... 2112 D.getDeclSpec().getSourceRange().getBegin()); 2113 } 2114 2115 if (D.isInvalidType()) 2116 NewFD->setInvalidDecl(); 2117 2118 // Set the lexical context. If the declarator has a C++ 2119 // scope specifier, the lexical context will be different 2120 // from the semantic context. 2121 NewFD->setLexicalDeclContext(CurContext); 2122 2123 // C++ [dcl.fct.spec]p5: 2124 // The virtual specifier shall only be used in declarations of 2125 // nonstatic class member functions that appear within a 2126 // member-specification of a class declaration; see 10.3. 2127 // 2128 if (isVirtual && !NewFD->isInvalidDecl()) { 2129 if (!isVirtualOkay) { 2130 Diag(D.getDeclSpec().getVirtualSpecLoc(), 2131 diag::err_virtual_non_function); 2132 } else if (!CurContext->isRecord()) { 2133 // 'virtual' was specified outside of the class. 2134 Diag(D.getDeclSpec().getVirtualSpecLoc(), diag::err_virtual_out_of_class) 2135 << CodeModificationHint::CreateRemoval( 2136 SourceRange(D.getDeclSpec().getVirtualSpecLoc())); 2137 } else { 2138 // Okay: Add virtual to the method. 2139 cast<CXXMethodDecl>(NewFD)->setVirtualAsWritten(true); 2140 CXXRecordDecl *CurClass = cast<CXXRecordDecl>(DC); 2141 CurClass->setAggregate(false); 2142 CurClass->setPOD(false); 2143 CurClass->setPolymorphic(true); 2144 CurClass->setHasTrivialConstructor(false); 2145 } 2146 } 2147 2148 if (CXXMethodDecl *NewMD = dyn_cast<CXXMethodDecl>(NewFD)) { 2149 // Look for virtual methods in base classes that this method might override. 2150 2151 BasePaths Paths; 2152 if (LookupInBases(cast<CXXRecordDecl>(DC), 2153 MemberLookupCriteria(NewMD), Paths)) { 2154 for (BasePaths::decl_iterator I = Paths.found_decls_begin(), 2155 E = Paths.found_decls_end(); I != E; ++I) { 2156 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) { 2157 if (!CheckOverridingFunctionReturnType(NewMD, OldMD)) 2158 NewMD->addOverriddenMethod(OldMD); 2159 } 2160 } 2161 } 2162 } 2163 2164 if (SC == FunctionDecl::Static && isa<CXXMethodDecl>(NewFD) && 2165 !CurContext->isRecord()) { 2166 // C++ [class.static]p1: 2167 // A data or function member of a class may be declared static 2168 // in a class definition, in which case it is a static member of 2169 // the class. 2170 2171 // Complain about the 'static' specifier if it's on an out-of-line 2172 // member function definition. 2173 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2174 diag::err_static_out_of_line) 2175 << CodeModificationHint::CreateRemoval( 2176 SourceRange(D.getDeclSpec().getStorageClassSpecLoc())); 2177 } 2178 2179 // Handle GNU asm-label extension (encoded as an attribute). 2180 if (Expr *E = (Expr*) D.getAsmLabel()) { 2181 // The parser guarantees this is a string. 2182 StringLiteral *SE = cast<StringLiteral>(E); 2183 NewFD->addAttr(::new (Context) AsmLabelAttr(std::string(SE->getStrData(), 2184 SE->getByteLength()))); 2185 } 2186 2187 // Copy the parameter declarations from the declarator D to the function 2188 // declaration NewFD, if they are available. First scavenge them into Params. 2189 llvm::SmallVector<ParmVarDecl*, 16> Params; 2190 if (D.getNumTypeObjects() > 0) { 2191 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2192 2193 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 2194 // function that takes no arguments, not a function that takes a 2195 // single void argument. 2196 // We let through "const void" here because Sema::GetTypeForDeclarator 2197 // already checks for that case. 2198 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 2199 FTI.ArgInfo[0].Param && 2200 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()) { 2201 // Empty arg list, don't push any params. 2202 ParmVarDecl *Param = FTI.ArgInfo[0].Param.getAs<ParmVarDecl>(); 2203 2204 // In C++, the empty parameter-type-list must be spelled "void"; a 2205 // typedef of void is not permitted. 2206 if (getLangOptions().CPlusPlus && 2207 Param->getType().getUnqualifiedType() != Context.VoidTy) 2208 Diag(Param->getLocation(), diag::err_param_typedef_of_void); 2209 // FIXME: Leaks decl? 2210 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 2211 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) 2212 Params.push_back(FTI.ArgInfo[i].Param.getAs<ParmVarDecl>()); 2213 } 2214 2215 } else if (const FunctionProtoType *FT = R->getAsFunctionProtoType()) { 2216 // When we're declaring a function with a typedef, typeof, etc as in the 2217 // following example, we'll need to synthesize (unnamed) 2218 // parameters for use in the declaration. 2219 // 2220 // @code 2221 // typedef void fn(int); 2222 // fn f; 2223 // @endcode 2224 2225 // Synthesize a parameter for each argument type. 2226 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 2227 AE = FT->arg_type_end(); AI != AE; ++AI) { 2228 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, 2229 SourceLocation(), 0, 2230 *AI, VarDecl::None, 0); 2231 Param->setImplicit(); 2232 Params.push_back(Param); 2233 } 2234 } else { 2235 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && 2236 "Should not need args for typedef of non-prototype fn"); 2237 } 2238 // Finally, we know we have the right number of parameters, install them. 2239 NewFD->setParams(Context, Params.data(), Params.size()); 2240 2241 2242 2243 // If name lookup finds a previous declaration that is not in the 2244 // same scope as the new declaration, this may still be an 2245 // acceptable redeclaration. 2246 if (PrevDecl && !isDeclInScope(PrevDecl, DC, S) && 2247 !(NewFD->hasLinkage() && 2248 isOutOfScopePreviousDeclaration(PrevDecl, DC, Context))) 2249 PrevDecl = 0; 2250 2251 // Perform semantic checking on the function declaration. 2252 bool OverloadableAttrRequired = false; // FIXME: HACK! 2253 CheckFunctionDeclaration(NewFD, PrevDecl, Redeclaration, 2254 /*FIXME:*/OverloadableAttrRequired); 2255 2256 if (D.getCXXScopeSpec().isSet() && !NewFD->isInvalidDecl()) { 2257 // An out-of-line member function declaration must also be a 2258 // definition (C++ [dcl.meaning]p1). 2259 if (!IsFunctionDefinition) { 2260 Diag(NewFD->getLocation(), diag::err_out_of_line_declaration) 2261 << D.getCXXScopeSpec().getRange(); 2262 NewFD->setInvalidDecl(); 2263 } else if (!Redeclaration) { 2264 // The user tried to provide an out-of-line definition for a 2265 // function that is a member of a class or namespace, but there 2266 // was no such member function declared (C++ [class.mfct]p2, 2267 // C++ [namespace.memdef]p2). For example: 2268 // 2269 // class X { 2270 // void f() const; 2271 // }; 2272 // 2273 // void X::f() { } // ill-formed 2274 // 2275 // Complain about this problem, and attempt to suggest close 2276 // matches (e.g., those that differ only in cv-qualifiers and 2277 // whether the parameter types are references). 2278 Diag(D.getIdentifierLoc(), diag::err_member_def_does_not_match) 2279 << cast<NamedDecl>(DC) << D.getCXXScopeSpec().getRange(); 2280 NewFD->setInvalidDecl(); 2281 2282 LookupResult Prev = LookupQualifiedName(DC, Name, LookupOrdinaryName, 2283 true); 2284 assert(!Prev.isAmbiguous() && 2285 "Cannot have an ambiguity in previous-declaration lookup"); 2286 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 2287 Func != FuncEnd; ++Func) { 2288 if (isa<FunctionDecl>(*Func) && 2289 isNearlyMatchingFunction(Context, cast<FunctionDecl>(*Func), NewFD)) 2290 Diag((*Func)->getLocation(), diag::note_member_def_close_match); 2291 } 2292 2293 PrevDecl = 0; 2294 } 2295 } 2296 2297 // Handle attributes. We need to have merged decls when handling attributes 2298 // (for example to check for conflicts, etc). 2299 // FIXME: This needs to happen before we merge declarations. Then, 2300 // let attribute merging cope with attribute conflicts. 2301 ProcessDeclAttributes(NewFD, D); 2302 AddKnownFunctionAttributes(NewFD); 2303 2304 if (OverloadableAttrRequired && !NewFD->getAttr<OverloadableAttr>()) { 2305 // If a function name is overloadable in C, then every function 2306 // with that name must be marked "overloadable". 2307 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 2308 << Redeclaration << NewFD; 2309 if (PrevDecl) 2310 Diag(PrevDecl->getLocation(), 2311 diag::note_attribute_overloadable_prev_overload); 2312 NewFD->addAttr(::new (Context) OverloadableAttr()); 2313 } 2314 2315 // If this is a locally-scoped extern C function, update the 2316 // map of such names. 2317 if (CurContext->isFunctionOrMethod() && NewFD->isExternC(Context) 2318 && !NewFD->isInvalidDecl()) 2319 RegisterLocallyScopedExternCDecl(NewFD, PrevDecl, S); 2320 2321 return NewFD; 2322} 2323 2324/// \brief Perform semantic checking of a new function declaration. 2325/// 2326/// Performs semantic analysis of the new function declaration 2327/// NewFD. This routine performs all semantic checking that does not 2328/// require the actual declarator involved in the declaration, and is 2329/// used both for the declaration of functions as they are parsed 2330/// (called via ActOnDeclarator) and for the declaration of functions 2331/// that have been instantiated via C++ template instantiation (called 2332/// via InstantiateDecl). 2333/// 2334/// This sets NewFD->isInvalidDecl() to true if there was an error. 2335void Sema::CheckFunctionDeclaration(FunctionDecl *NewFD, NamedDecl *&PrevDecl, 2336 bool &Redeclaration, 2337 bool &OverloadableAttrRequired) { 2338 // If NewFD is already known erroneous, don't do any of this checking. 2339 if (NewFD->isInvalidDecl()) 2340 return; 2341 2342 if (NewFD->getResultType()->isVariablyModifiedType()) { 2343 // Functions returning a variably modified type violate C99 6.7.5.2p2 2344 // because all functions have linkage. 2345 Diag(NewFD->getLocation(), diag::err_vm_func_decl); 2346 return NewFD->setInvalidDecl(); 2347 } 2348 2349 // Semantic checking for this function declaration (in isolation). 2350 if (getLangOptions().CPlusPlus) { 2351 // C++-specific checks. 2352 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { 2353 CheckConstructor(Constructor); 2354 } else if (isa<CXXDestructorDecl>(NewFD)) { 2355 CXXRecordDecl *Record = cast<CXXRecordDecl>(NewFD->getParent()); 2356 Record->setUserDeclaredDestructor(true); 2357 // C++ [class]p4: A POD-struct is an aggregate class that has [...] no 2358 // user-defined destructor. 2359 Record->setPOD(false); 2360 2361 // C++ [class.dtor]p3: A destructor is trivial if it is an implicitly- 2362 // declared destructor. 2363 Record->setHasTrivialDestructor(false); 2364 } else if (CXXConversionDecl *Conversion 2365 = dyn_cast<CXXConversionDecl>(NewFD)) 2366 ActOnConversionDeclarator(Conversion); 2367 2368 // Extra checking for C++ overloaded operators (C++ [over.oper]). 2369 if (NewFD->isOverloadedOperator() && 2370 CheckOverloadedOperatorDeclaration(NewFD)) 2371 return NewFD->setInvalidDecl(); 2372 } 2373 2374 // C99 6.7.4p6: 2375 // [... ] For a function with external linkage, the following 2376 // restrictions apply: [...] If all of the file scope declarations 2377 // for a function in a translation unit include the inline 2378 // function specifier without extern, then the definition in that 2379 // translation unit is an inline definition. An inline definition 2380 // does not provide an external definition for the function, and 2381 // does not forbid an external definition in another translation 2382 // unit. 2383 // 2384 // Here we determine whether this function, in isolation, would be a 2385 // C99 inline definition. MergeCompatibleFunctionDecls looks at 2386 // previous declarations. 2387 if (NewFD->isInline() && getLangOptions().C99 && 2388 NewFD->getStorageClass() == FunctionDecl::None && 2389 NewFD->getDeclContext()->getLookupContext()->isTranslationUnit()) 2390 NewFD->setC99InlineDefinition(true); 2391 2392 // Check for a previous declaration of this name. 2393 if (!PrevDecl && NewFD->isExternC(Context)) { 2394 // Since we did not find anything by this name and we're declaring 2395 // an extern "C" function, look for a non-visible extern "C" 2396 // declaration with the same name. 2397 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 2398 = LocallyScopedExternalDecls.find(NewFD->getDeclName()); 2399 if (Pos != LocallyScopedExternalDecls.end()) 2400 PrevDecl = Pos->second; 2401 } 2402 2403 // Merge or overload the declaration with an existing declaration of 2404 // the same name, if appropriate. 2405 if (PrevDecl) { 2406 // Determine whether NewFD is an overload of PrevDecl or 2407 // a declaration that requires merging. If it's an overload, 2408 // there's no more work to do here; we'll just add the new 2409 // function to the scope. 2410 OverloadedFunctionDecl::function_iterator MatchedDecl; 2411 2412 if (!getLangOptions().CPlusPlus && 2413 AllowOverloadingOfFunction(PrevDecl, Context)) { 2414 OverloadableAttrRequired = true; 2415 2416 // Functions marked "overloadable" must have a prototype (that 2417 // we can't get through declaration merging). 2418 if (!NewFD->getType()->getAsFunctionProtoType()) { 2419 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_no_prototype) 2420 << NewFD; 2421 Redeclaration = true; 2422 2423 // Turn this into a variadic function with no parameters. 2424 QualType R = Context.getFunctionType( 2425 NewFD->getType()->getAsFunctionType()->getResultType(), 2426 0, 0, true, 0); 2427 NewFD->setType(R); 2428 return NewFD->setInvalidDecl(); 2429 } 2430 } 2431 2432 if (PrevDecl && 2433 (!AllowOverloadingOfFunction(PrevDecl, Context) || 2434 !IsOverload(NewFD, PrevDecl, MatchedDecl))) { 2435 Redeclaration = true; 2436 Decl *OldDecl = PrevDecl; 2437 2438 // If PrevDecl was an overloaded function, extract the 2439 // FunctionDecl that matched. 2440 if (isa<OverloadedFunctionDecl>(PrevDecl)) 2441 OldDecl = *MatchedDecl; 2442 2443 // NewFD and OldDecl represent declarations that need to be 2444 // merged. 2445 if (MergeFunctionDecl(NewFD, OldDecl)) 2446 return NewFD->setInvalidDecl(); 2447 2448 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 2449 } 2450 } 2451 2452 // In C++, check default arguments now that we have merged decls. Unless 2453 // the lexical context is the class, because in this case this is done 2454 // during delayed parsing anyway. 2455 if (getLangOptions().CPlusPlus && !CurContext->isRecord()) 2456 CheckCXXDefaultArguments(NewFD); 2457} 2458 2459bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 2460 // FIXME: Need strict checking. In C89, we need to check for 2461 // any assignment, increment, decrement, function-calls, or 2462 // commas outside of a sizeof. In C99, it's the same list, 2463 // except that the aforementioned are allowed in unevaluated 2464 // expressions. Everything else falls under the 2465 // "may accept other forms of constant expressions" exception. 2466 // (We never end up here for C++, so the constant expression 2467 // rules there don't matter.) 2468 if (Init->isConstantInitializer(Context)) 2469 return false; 2470 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 2471 << Init->getSourceRange(); 2472 return true; 2473} 2474 2475void Sema::AddInitializerToDecl(DeclPtrTy dcl, FullExprArg init) { 2476 AddInitializerToDecl(dcl, init.release(), /*DirectInit=*/false); 2477} 2478 2479/// AddInitializerToDecl - Adds the initializer Init to the 2480/// declaration dcl. If DirectInit is true, this is C++ direct 2481/// initialization rather than copy initialization. 2482void Sema::AddInitializerToDecl(DeclPtrTy dcl, ExprArg init, bool DirectInit) { 2483 Decl *RealDecl = dcl.getAs<Decl>(); 2484 // If there is no declaration, there was an error parsing it. Just ignore 2485 // the initializer. 2486 if (RealDecl == 0) 2487 return; 2488 2489 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 2490 // With declarators parsed the way they are, the parser cannot 2491 // distinguish between a normal initializer and a pure-specifier. 2492 // Thus this grotesque test. 2493 IntegerLiteral *IL; 2494 Expr *Init = static_cast<Expr *>(init.get()); 2495 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 2496 Context.getCanonicalType(IL->getType()) == Context.IntTy) { 2497 if (Method->isVirtualAsWritten()) { 2498 Method->setPure(); 2499 2500 // A class is abstract if at least one function is pure virtual. 2501 cast<CXXRecordDecl>(CurContext)->setAbstract(true); 2502 } else if (!Method->isInvalidDecl()) { 2503 Diag(Method->getLocation(), diag::err_non_virtual_pure) 2504 << Method->getDeclName() << Init->getSourceRange(); 2505 Method->setInvalidDecl(); 2506 } 2507 } else { 2508 Diag(Method->getLocation(), diag::err_member_function_initialization) 2509 << Method->getDeclName() << Init->getSourceRange(); 2510 Method->setInvalidDecl(); 2511 } 2512 return; 2513 } 2514 2515 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 2516 if (!VDecl) { 2517 if (getLangOptions().CPlusPlus && 2518 RealDecl->getLexicalDeclContext()->isRecord() && 2519 isa<NamedDecl>(RealDecl)) 2520 Diag(RealDecl->getLocation(), diag::err_member_initialization) 2521 << cast<NamedDecl>(RealDecl)->getDeclName(); 2522 else 2523 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 2524 RealDecl->setInvalidDecl(); 2525 return; 2526 } 2527 2528 if (!VDecl->getType()->isArrayType() && 2529 RequireCompleteType(VDecl->getLocation(), VDecl->getType(), 2530 diag::err_typecheck_decl_incomplete_type)) { 2531 RealDecl->setInvalidDecl(); 2532 return; 2533 } 2534 2535 const VarDecl *Def = 0; 2536 if (VDecl->getDefinition(Def)) { 2537 Diag(VDecl->getLocation(), diag::err_redefinition) 2538 << VDecl->getDeclName(); 2539 Diag(Def->getLocation(), diag::note_previous_definition); 2540 VDecl->setInvalidDecl(); 2541 return; 2542 } 2543 2544 // Take ownership of the expression, now that we're sure we have somewhere 2545 // to put it. 2546 Expr *Init = init.takeAs<Expr>(); 2547 assert(Init && "missing initializer"); 2548 2549 // Get the decls type and save a reference for later, since 2550 // CheckInitializerTypes may change it. 2551 QualType DclT = VDecl->getType(), SavT = DclT; 2552 if (VDecl->isBlockVarDecl()) { 2553 if (VDecl->hasExternalStorage()) { // C99 6.7.8p5 2554 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 2555 VDecl->setInvalidDecl(); 2556 } else if (!VDecl->isInvalidDecl()) { 2557 if (CheckInitializerTypes(Init, DclT, VDecl->getLocation(), 2558 VDecl->getDeclName(), DirectInit)) 2559 VDecl->setInvalidDecl(); 2560 2561 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 2562 // Don't check invalid declarations to avoid emitting useless diagnostics. 2563 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 2564 if (VDecl->getStorageClass() == VarDecl::Static) // C99 6.7.8p4. 2565 CheckForConstantInitializer(Init, DclT); 2566 } 2567 } 2568 } else if (VDecl->isStaticDataMember() && 2569 VDecl->getLexicalDeclContext()->isRecord()) { 2570 // This is an in-class initialization for a static data member, e.g., 2571 // 2572 // struct S { 2573 // static const int value = 17; 2574 // }; 2575 2576 // Attach the initializer 2577 VDecl->setInit(Context, Init); 2578 2579 // C++ [class.mem]p4: 2580 // A member-declarator can contain a constant-initializer only 2581 // if it declares a static member (9.4) of const integral or 2582 // const enumeration type, see 9.4.2. 2583 QualType T = VDecl->getType(); 2584 if (!T->isDependentType() && 2585 (!Context.getCanonicalType(T).isConstQualified() || 2586 !T->isIntegralType())) { 2587 Diag(VDecl->getLocation(), diag::err_member_initialization) 2588 << VDecl->getDeclName() << Init->getSourceRange(); 2589 VDecl->setInvalidDecl(); 2590 } else { 2591 // C++ [class.static.data]p4: 2592 // If a static data member is of const integral or const 2593 // enumeration type, its declaration in the class definition 2594 // can specify a constant-initializer which shall be an 2595 // integral constant expression (5.19). 2596 if (!Init->isTypeDependent() && 2597 !Init->getType()->isIntegralType()) { 2598 // We have a non-dependent, non-integral or enumeration type. 2599 Diag(Init->getSourceRange().getBegin(), 2600 diag::err_in_class_initializer_non_integral_type) 2601 << Init->getType() << Init->getSourceRange(); 2602 VDecl->setInvalidDecl(); 2603 } else if (!Init->isTypeDependent() && !Init->isValueDependent()) { 2604 // Check whether the expression is a constant expression. 2605 llvm::APSInt Value; 2606 SourceLocation Loc; 2607 if (!Init->isIntegerConstantExpr(Value, Context, &Loc)) { 2608 Diag(Loc, diag::err_in_class_initializer_non_constant) 2609 << Init->getSourceRange(); 2610 VDecl->setInvalidDecl(); 2611 } else if (!VDecl->getType()->isDependentType()) 2612 ImpCastExprToType(Init, VDecl->getType()); 2613 } 2614 } 2615 } else if (VDecl->isFileVarDecl()) { 2616 if (VDecl->getStorageClass() == VarDecl::Extern) 2617 Diag(VDecl->getLocation(), diag::warn_extern_init); 2618 if (!VDecl->isInvalidDecl()) 2619 if (CheckInitializerTypes(Init, DclT, VDecl->getLocation(), 2620 VDecl->getDeclName(), DirectInit)) 2621 VDecl->setInvalidDecl(); 2622 2623 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 2624 // Don't check invalid declarations to avoid emitting useless diagnostics. 2625 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 2626 // C99 6.7.8p4. All file scoped initializers need to be constant. 2627 CheckForConstantInitializer(Init, DclT); 2628 } 2629 } 2630 // If the type changed, it means we had an incomplete type that was 2631 // completed by the initializer. For example: 2632 // int ary[] = { 1, 3, 5 }; 2633 // "ary" transitions from a VariableArrayType to a ConstantArrayType. 2634 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 2635 VDecl->setType(DclT); 2636 Init->setType(DclT); 2637 } 2638 2639 // Attach the initializer to the decl. 2640 VDecl->setInit(Context, Init); 2641 2642 // If the previous declaration of VDecl was a tentative definition, 2643 // remove it from the set of tentative definitions. 2644 if (VDecl->getPreviousDeclaration() && 2645 VDecl->getPreviousDeclaration()->isTentativeDefinition(Context)) { 2646 llvm::DenseMap<DeclarationName, VarDecl *>::iterator Pos 2647 = TentativeDefinitions.find(VDecl->getDeclName()); 2648 assert(Pos != TentativeDefinitions.end() && 2649 "Unrecorded tentative definition?"); 2650 TentativeDefinitions.erase(Pos); 2651 } 2652 2653 return; 2654} 2655 2656void Sema::ActOnUninitializedDecl(DeclPtrTy dcl) { 2657 Decl *RealDecl = dcl.getAs<Decl>(); 2658 2659 // If there is no declaration, there was an error parsing it. Just ignore it. 2660 if (RealDecl == 0) 2661 return; 2662 2663 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 2664 QualType Type = Var->getType(); 2665 2666 // Record tentative definitions. 2667 if (Var->isTentativeDefinition(Context)) 2668 TentativeDefinitions[Var->getDeclName()] = Var; 2669 2670 // C++ [dcl.init.ref]p3: 2671 // The initializer can be omitted for a reference only in a 2672 // parameter declaration (8.3.5), in the declaration of a 2673 // function return type, in the declaration of a class member 2674 // within its class declaration (9.2), and where the extern 2675 // specifier is explicitly used. 2676 if (Type->isReferenceType() && !Var->hasExternalStorage()) { 2677 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 2678 << Var->getDeclName() 2679 << SourceRange(Var->getLocation(), Var->getLocation()); 2680 Var->setInvalidDecl(); 2681 return; 2682 } 2683 2684 // C++ [dcl.init]p9: 2685 // 2686 // If no initializer is specified for an object, and the object 2687 // is of (possibly cv-qualified) non-POD class type (or array 2688 // thereof), the object shall be default-initialized; if the 2689 // object is of const-qualified type, the underlying class type 2690 // shall have a user-declared default constructor. 2691 if (getLangOptions().CPlusPlus) { 2692 QualType InitType = Type; 2693 if (const ArrayType *Array = Context.getAsArrayType(Type)) 2694 InitType = Array->getElementType(); 2695 if ((!Var->hasExternalStorage() && !Var->isExternC(Context)) && 2696 InitType->isRecordType() && !InitType->isDependentType()) { 2697 CXXRecordDecl *RD = 2698 cast<CXXRecordDecl>(InitType->getAsRecordType()->getDecl()); 2699 CXXConstructorDecl *Constructor = 0; 2700 if (!RequireCompleteType(Var->getLocation(), InitType, 2701 diag::err_invalid_incomplete_type_use)) 2702 Constructor 2703 = PerformInitializationByConstructor(InitType, 0, 0, 2704 Var->getLocation(), 2705 SourceRange(Var->getLocation(), 2706 Var->getLocation()), 2707 Var->getDeclName(), 2708 IK_Default); 2709 if (!Constructor) 2710 Var->setInvalidDecl(); 2711 else if (!RD->hasTrivialConstructor()) 2712 InitializeVarWithConstructor(Var, Constructor, InitType, 0, 0); 2713 } 2714 } 2715 2716#if 0 2717 // FIXME: Temporarily disabled because we are not properly parsing 2718 // linkage specifications on declarations, e.g., 2719 // 2720 // extern "C" const CGPoint CGPointerZero; 2721 // 2722 // C++ [dcl.init]p9: 2723 // 2724 // If no initializer is specified for an object, and the 2725 // object is of (possibly cv-qualified) non-POD class type (or 2726 // array thereof), the object shall be default-initialized; if 2727 // the object is of const-qualified type, the underlying class 2728 // type shall have a user-declared default 2729 // constructor. Otherwise, if no initializer is specified for 2730 // an object, the object and its subobjects, if any, have an 2731 // indeterminate initial value; if the object or any of its 2732 // subobjects are of const-qualified type, the program is 2733 // ill-formed. 2734 // 2735 // This isn't technically an error in C, so we don't diagnose it. 2736 // 2737 // FIXME: Actually perform the POD/user-defined default 2738 // constructor check. 2739 if (getLangOptions().CPlusPlus && 2740 Context.getCanonicalType(Type).isConstQualified() && 2741 !Var->hasExternalStorage()) 2742 Diag(Var->getLocation(), diag::err_const_var_requires_init) 2743 << Var->getName() 2744 << SourceRange(Var->getLocation(), Var->getLocation()); 2745#endif 2746 } 2747} 2748 2749Sema::DeclGroupPtrTy Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, 2750 DeclPtrTy *Group, 2751 unsigned NumDecls) { 2752 llvm::SmallVector<Decl*, 8> Decls; 2753 2754 if (DS.isTypeSpecOwned()) 2755 Decls.push_back((Decl*)DS.getTypeRep()); 2756 2757 for (unsigned i = 0; i != NumDecls; ++i) 2758 if (Decl *D = Group[i].getAs<Decl>()) 2759 Decls.push_back(D); 2760 2761 // Perform semantic analysis that depends on having fully processed both 2762 // the declarator and initializer. 2763 for (unsigned i = 0, e = Decls.size(); i != e; ++i) { 2764 VarDecl *IDecl = dyn_cast<VarDecl>(Decls[i]); 2765 if (!IDecl) 2766 continue; 2767 QualType T = IDecl->getType(); 2768 2769 // Block scope. C99 6.7p7: If an identifier for an object is declared with 2770 // no linkage (C99 6.2.2p6), the type for the object shall be complete... 2771 if (IDecl->isBlockVarDecl() && !IDecl->hasExternalStorage()) { 2772 if (!IDecl->isInvalidDecl() && 2773 RequireCompleteType(IDecl->getLocation(), T, 2774 diag::err_typecheck_decl_incomplete_type)) 2775 IDecl->setInvalidDecl(); 2776 } 2777 // File scope. C99 6.9.2p2: A declaration of an identifier for and 2778 // object that has file scope without an initializer, and without a 2779 // storage-class specifier or with the storage-class specifier "static", 2780 // constitutes a tentative definition. Note: A tentative definition with 2781 // external linkage is valid (C99 6.2.2p5). 2782 if (IDecl->isTentativeDefinition(Context)) { 2783 QualType CheckType = T; 2784 unsigned DiagID = diag::err_typecheck_decl_incomplete_type; 2785 2786 const IncompleteArrayType *ArrayT = Context.getAsIncompleteArrayType(T); 2787 if (ArrayT) { 2788 CheckType = ArrayT->getElementType(); 2789 DiagID = diag::err_illegal_decl_array_incomplete_type; 2790 } 2791 2792 if (IDecl->isInvalidDecl()) { 2793 // Do nothing with invalid declarations 2794 } else if ((ArrayT || IDecl->getStorageClass() == VarDecl::Static) && 2795 RequireCompleteType(IDecl->getLocation(), CheckType, DiagID)) { 2796 // C99 6.9.2p3: If the declaration of an identifier for an object is 2797 // a tentative definition and has internal linkage (C99 6.2.2p3), the 2798 // declared type shall not be an incomplete type. 2799 IDecl->setInvalidDecl(); 2800 } 2801 } 2802 } 2803 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, 2804 Decls.data(), Decls.size())); 2805} 2806 2807 2808/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 2809/// to introduce parameters into function prototype scope. 2810Sema::DeclPtrTy 2811Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 2812 const DeclSpec &DS = D.getDeclSpec(); 2813 2814 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 2815 VarDecl::StorageClass StorageClass = VarDecl::None; 2816 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 2817 StorageClass = VarDecl::Register; 2818 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 2819 Diag(DS.getStorageClassSpecLoc(), 2820 diag::err_invalid_storage_class_in_func_decl); 2821 D.getMutableDeclSpec().ClearStorageClassSpecs(); 2822 } 2823 2824 if (D.getDeclSpec().isThreadSpecified()) 2825 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 2826 2827 DiagnoseFunctionSpecifiers(D); 2828 2829 // Check that there are no default arguments inside the type of this 2830 // parameter (C++ only). 2831 if (getLangOptions().CPlusPlus) 2832 CheckExtraCXXDefaultArguments(D); 2833 2834 TagDecl *OwnedDecl = 0; 2835 QualType parmDeclType = GetTypeForDeclarator(D, S, /*Skip=*/0, &OwnedDecl); 2836 2837 if (getLangOptions().CPlusPlus && OwnedDecl && OwnedDecl->isDefinition()) { 2838 // C++ [dcl.fct]p6: 2839 // Types shall not be defined in return or parameter types. 2840 Diag(OwnedDecl->getLocation(), diag::err_type_defined_in_param_type) 2841 << Context.getTypeDeclType(OwnedDecl); 2842 } 2843 2844 // TODO: CHECK FOR CONFLICTS, multiple decls with same name in one scope. 2845 // Can this happen for params? We already checked that they don't conflict 2846 // among each other. Here they can only shadow globals, which is ok. 2847 IdentifierInfo *II = D.getIdentifier(); 2848 if (II) { 2849 if (NamedDecl *PrevDecl = LookupName(S, II, LookupOrdinaryName)) { 2850 if (PrevDecl->isTemplateParameter()) { 2851 // Maybe we will complain about the shadowed template parameter. 2852 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 2853 // Just pretend that we didn't see the previous declaration. 2854 PrevDecl = 0; 2855 } else if (S->isDeclScope(DeclPtrTy::make(PrevDecl))) { 2856 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 2857 2858 // Recover by removing the name 2859 II = 0; 2860 D.SetIdentifier(0, D.getIdentifierLoc()); 2861 } 2862 } 2863 } 2864 2865 // Parameters can not be abstract class types. 2866 // For record types, this is done by the AbstractClassUsageDiagnoser once 2867 // the class has been completely parsed. 2868 if (!CurContext->isRecord() && 2869 RequireNonAbstractType(D.getIdentifierLoc(), parmDeclType, 2870 diag::err_abstract_type_in_decl, 2871 AbstractParamType)) 2872 D.setInvalidType(true); 2873 2874 QualType T = adjustParameterType(parmDeclType); 2875 2876 ParmVarDecl *New; 2877 if (T == parmDeclType) // parameter type did not need adjustment 2878 New = ParmVarDecl::Create(Context, CurContext, 2879 D.getIdentifierLoc(), II, 2880 parmDeclType, StorageClass, 2881 0); 2882 else // keep track of both the adjusted and unadjusted types 2883 New = OriginalParmVarDecl::Create(Context, CurContext, 2884 D.getIdentifierLoc(), II, T, 2885 parmDeclType, StorageClass, 0); 2886 2887 if (D.isInvalidType()) 2888 New->setInvalidDecl(); 2889 2890 // Parameter declarators cannot be interface types. All ObjC objects are 2891 // passed by reference. 2892 if (T->isObjCInterfaceType()) { 2893 Diag(D.getIdentifierLoc(), 2894 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T; 2895 New->setInvalidDecl(); 2896 } 2897 2898 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 2899 if (D.getCXXScopeSpec().isSet()) { 2900 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 2901 << D.getCXXScopeSpec().getRange(); 2902 New->setInvalidDecl(); 2903 } 2904 2905 // Add the parameter declaration into this scope. 2906 S->AddDecl(DeclPtrTy::make(New)); 2907 if (II) 2908 IdResolver.AddDecl(New); 2909 2910 ProcessDeclAttributes(New, D); 2911 2912 if (New->hasAttr<BlocksAttr>()) { 2913 Diag(New->getLocation(), diag::err_block_on_nonlocal); 2914 } 2915 return DeclPtrTy::make(New); 2916} 2917 2918void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 2919 SourceLocation LocAfterDecls) { 2920 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 2921 "Not a function declarator!"); 2922 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2923 2924 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 2925 // for a K&R function. 2926 if (!FTI.hasPrototype) { 2927 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 2928 --i; 2929 if (FTI.ArgInfo[i].Param == 0) { 2930 std::string Code = " int "; 2931 Code += FTI.ArgInfo[i].Ident->getName(); 2932 Code += ";\n"; 2933 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 2934 << FTI.ArgInfo[i].Ident 2935 << CodeModificationHint::CreateInsertion(LocAfterDecls, Code); 2936 2937 // Implicitly declare the argument as type 'int' for lack of a better 2938 // type. 2939 DeclSpec DS; 2940 const char* PrevSpec; // unused 2941 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 2942 PrevSpec); 2943 Declarator ParamD(DS, Declarator::KNRTypeListContext); 2944 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 2945 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 2946 } 2947 } 2948 } 2949} 2950 2951Sema::DeclPtrTy Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, 2952 Declarator &D) { 2953 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 2954 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 2955 "Not a function declarator!"); 2956 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2957 2958 if (FTI.hasPrototype) { 2959 // FIXME: Diagnose arguments without names in C. 2960 } 2961 2962 Scope *ParentScope = FnBodyScope->getParent(); 2963 2964 DeclPtrTy DP = ActOnDeclarator(ParentScope, D, /*IsFunctionDefinition=*/true); 2965 return ActOnStartOfFunctionDef(FnBodyScope, DP); 2966} 2967 2968Sema::DeclPtrTy Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, DeclPtrTy D) { 2969 FunctionDecl *FD = cast<FunctionDecl>(D.getAs<Decl>()); 2970 2971 CurFunctionNeedsScopeChecking = false; 2972 2973 // See if this is a redefinition. 2974 const FunctionDecl *Definition; 2975 if (FD->getBody(Context, Definition)) { 2976 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 2977 Diag(Definition->getLocation(), diag::note_previous_definition); 2978 } 2979 2980 // Builtin functions cannot be defined. 2981 if (unsigned BuiltinID = FD->getBuiltinID(Context)) { 2982 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 2983 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 2984 FD->setInvalidDecl(); 2985 } 2986 } 2987 2988 // The return type of a function definition must be complete 2989 // (C99 6.9.1p3, C++ [dcl.fct]p6). 2990 QualType ResultType = FD->getResultType(); 2991 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 2992 !FD->isInvalidDecl() && 2993 RequireCompleteType(FD->getLocation(), ResultType, 2994 diag::err_func_def_incomplete_result)) 2995 FD->setInvalidDecl(); 2996 2997 // GNU warning -Wmissing-prototypes: 2998 // Warn if a global function is defined without a previous 2999 // prototype declaration. This warning is issued even if the 3000 // definition itself provides a prototype. The aim is to detect 3001 // global functions that fail to be declared in header files. 3002 if (!FD->isInvalidDecl() && FD->isGlobal() && !isa<CXXMethodDecl>(FD) && 3003 !FD->isMain()) { 3004 bool MissingPrototype = true; 3005 for (const FunctionDecl *Prev = FD->getPreviousDeclaration(); 3006 Prev; Prev = Prev->getPreviousDeclaration()) { 3007 // Ignore any declarations that occur in function or method 3008 // scope, because they aren't visible from the header. 3009 if (Prev->getDeclContext()->isFunctionOrMethod()) 3010 continue; 3011 3012 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 3013 break; 3014 } 3015 3016 if (MissingPrototype) 3017 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 3018 } 3019 3020 if (FnBodyScope) 3021 PushDeclContext(FnBodyScope, FD); 3022 3023 // Check the validity of our function parameters 3024 CheckParmsForFunctionDef(FD); 3025 3026 // Introduce our parameters into the function scope 3027 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 3028 ParmVarDecl *Param = FD->getParamDecl(p); 3029 Param->setOwningFunction(FD); 3030 3031 // If this has an identifier, add it to the scope stack. 3032 if (Param->getIdentifier() && FnBodyScope) 3033 PushOnScopeChains(Param, FnBodyScope); 3034 } 3035 3036 // Checking attributes of current function definition 3037 // dllimport attribute. 3038 if (FD->getAttr<DLLImportAttr>() && (!FD->getAttr<DLLExportAttr>())) { 3039 // dllimport attribute cannot be applied to definition. 3040 if (!(FD->getAttr<DLLImportAttr>())->isInherited()) { 3041 Diag(FD->getLocation(), 3042 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 3043 << "dllimport"; 3044 FD->setInvalidDecl(); 3045 return DeclPtrTy::make(FD); 3046 } else { 3047 // If a symbol previously declared dllimport is later defined, the 3048 // attribute is ignored in subsequent references, and a warning is 3049 // emitted. 3050 Diag(FD->getLocation(), 3051 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 3052 << FD->getNameAsCString() << "dllimport"; 3053 } 3054 } 3055 return DeclPtrTy::make(FD); 3056} 3057 3058Sema::DeclPtrTy Sema::ActOnFinishFunctionBody(DeclPtrTy D, StmtArg BodyArg) { 3059 return ActOnFinishFunctionBody(D, move(BodyArg), false); 3060} 3061 3062Sema::DeclPtrTy Sema::ActOnFinishFunctionBody(DeclPtrTy D, StmtArg BodyArg, 3063 bool IsInstantiation) { 3064 Decl *dcl = D.getAs<Decl>(); 3065 Stmt *Body = BodyArg.takeAs<Stmt>(); 3066 if (FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(dcl)) { 3067 FD->setBody(Body); 3068 assert(FD == getCurFunctionDecl() && "Function parsing confused"); 3069 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 3070 assert(MD == getCurMethodDecl() && "Method parsing confused"); 3071 MD->setBody(Body); 3072 } else { 3073 Body->Destroy(Context); 3074 return DeclPtrTy(); 3075 } 3076 if (!IsInstantiation) 3077 PopDeclContext(); 3078 3079 // Verify and clean out per-function state. 3080 3081 assert(&getLabelMap() == &FunctionLabelMap && "Didn't pop block right?"); 3082 3083 // Check goto/label use. 3084 for (llvm::DenseMap<IdentifierInfo*, LabelStmt*>::iterator 3085 I = FunctionLabelMap.begin(), E = FunctionLabelMap.end(); I != E; ++I) { 3086 LabelStmt *L = I->second; 3087 3088 // Verify that we have no forward references left. If so, there was a goto 3089 // or address of a label taken, but no definition of it. Label fwd 3090 // definitions are indicated with a null substmt. 3091 if (L->getSubStmt() != 0) 3092 continue; 3093 3094 // Emit error. 3095 Diag(L->getIdentLoc(), diag::err_undeclared_label_use) << L->getName(); 3096 3097 // At this point, we have gotos that use the bogus label. Stitch it into 3098 // the function body so that they aren't leaked and that the AST is well 3099 // formed. 3100 if (Body == 0) { 3101 // The whole function wasn't parsed correctly, just delete this. 3102 L->Destroy(Context); 3103 continue; 3104 } 3105 3106 // Otherwise, the body is valid: we want to stitch the label decl into the 3107 // function somewhere so that it is properly owned and so that the goto 3108 // has a valid target. Do this by creating a new compound stmt with the 3109 // label in it. 3110 3111 // Give the label a sub-statement. 3112 L->setSubStmt(new (Context) NullStmt(L->getIdentLoc())); 3113 3114 CompoundStmt *Compound = isa<CXXTryStmt>(Body) ? 3115 cast<CXXTryStmt>(Body)->getTryBlock() : 3116 cast<CompoundStmt>(Body); 3117 std::vector<Stmt*> Elements(Compound->body_begin(), Compound->body_end()); 3118 Elements.push_back(L); 3119 Compound->setStmts(Context, &Elements[0], Elements.size()); 3120 } 3121 FunctionLabelMap.clear(); 3122 3123 if (!Body) return D; 3124 3125 // Verify that that gotos and switch cases don't jump into scopes illegally. 3126 if (CurFunctionNeedsScopeChecking) 3127 DiagnoseInvalidJumps(Body); 3128 3129 // C++ constructors that have function-try-blocks can't have return statements 3130 // in the handlers of that block. (C++ [except.handle]p14) Verify this. 3131 if (isa<CXXConstructorDecl>(dcl) && isa<CXXTryStmt>(Body)) 3132 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); 3133 3134 return D; 3135} 3136 3137/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 3138/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 3139NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 3140 IdentifierInfo &II, Scope *S) { 3141 // Before we produce a declaration for an implicitly defined 3142 // function, see whether there was a locally-scoped declaration of 3143 // this name as a function or variable. If so, use that 3144 // (non-visible) declaration, and complain about it. 3145 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3146 = LocallyScopedExternalDecls.find(&II); 3147 if (Pos != LocallyScopedExternalDecls.end()) { 3148 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 3149 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 3150 return Pos->second; 3151 } 3152 3153 // Extension in C99. Legal in C90, but warn about it. 3154 if (getLangOptions().C99) 3155 Diag(Loc, diag::ext_implicit_function_decl) << &II; 3156 else 3157 Diag(Loc, diag::warn_implicit_function_decl) << &II; 3158 3159 // FIXME: handle stuff like: 3160 // void foo() { extern float X(); } 3161 // void bar() { X(); } <-- implicit decl for X in another scope. 3162 3163 // Set a Declarator for the implicit definition: int foo(); 3164 const char *Dummy; 3165 DeclSpec DS; 3166 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy); 3167 Error = Error; // Silence warning. 3168 assert(!Error && "Error setting up implicit decl!"); 3169 Declarator D(DS, Declarator::BlockContext); 3170 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0, 3171 0, 0, false, SourceLocation(), 3172 false, 0,0,0, Loc, D), 3173 SourceLocation()); 3174 D.SetIdentifier(&II, Loc); 3175 3176 // Insert this function into translation-unit scope. 3177 3178 DeclContext *PrevDC = CurContext; 3179 CurContext = Context.getTranslationUnitDecl(); 3180 3181 FunctionDecl *FD = 3182 dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D, DeclPtrTy()).getAs<Decl>()); 3183 FD->setImplicit(); 3184 3185 CurContext = PrevDC; 3186 3187 AddKnownFunctionAttributes(FD); 3188 3189 return FD; 3190} 3191 3192/// \brief Adds any function attributes that we know a priori based on 3193/// the declaration of this function. 3194/// 3195/// These attributes can apply both to implicitly-declared builtins 3196/// (like __builtin___printf_chk) or to library-declared functions 3197/// like NSLog or printf. 3198void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 3199 if (FD->isInvalidDecl()) 3200 return; 3201 3202 // If this is a built-in function, map its builtin attributes to 3203 // actual attributes. 3204 if (unsigned BuiltinID = FD->getBuiltinID(Context)) { 3205 // Handle printf-formatting attributes. 3206 unsigned FormatIdx; 3207 bool HasVAListArg; 3208 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 3209 if (!FD->getAttr<FormatAttr>()) 3210 FD->addAttr(::new (Context) FormatAttr("printf", FormatIdx + 1, 3211 HasVAListArg ? 0 : FormatIdx + 2)); 3212 } 3213 3214 // Mark const if we don't care about errno and that is the only 3215 // thing preventing the function from being const. This allows 3216 // IRgen to use LLVM intrinsics for such functions. 3217 if (!getLangOptions().MathErrno && 3218 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 3219 if (!FD->getAttr<ConstAttr>()) 3220 FD->addAttr(::new (Context) ConstAttr()); 3221 } 3222 } 3223 3224 IdentifierInfo *Name = FD->getIdentifier(); 3225 if (!Name) 3226 return; 3227 if ((!getLangOptions().CPlusPlus && 3228 FD->getDeclContext()->isTranslationUnit()) || 3229 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 3230 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 3231 LinkageSpecDecl::lang_c)) { 3232 // Okay: this could be a libc/libm/Objective-C function we know 3233 // about. 3234 } else 3235 return; 3236 3237 if (Name->isStr("NSLog") || Name->isStr("NSLogv")) { 3238 if (const FormatAttr *Format = FD->getAttr<FormatAttr>()) { 3239 // FIXME: We known better than our headers. 3240 const_cast<FormatAttr *>(Format)->setType("printf"); 3241 } else 3242 FD->addAttr(::new (Context) FormatAttr("printf", 1, 3243 Name->isStr("NSLogv") ? 0 : 2)); 3244 } else if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { 3245 if (!FD->getAttr<FormatAttr>()) 3246 FD->addAttr(::new (Context) FormatAttr("printf", 2, 3247 Name->isStr("vasprintf") ? 0 : 3)); 3248 } 3249} 3250 3251TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T) { 3252 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 3253 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 3254 3255 // Scope manipulation handled by caller. 3256 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 3257 D.getIdentifierLoc(), 3258 D.getIdentifier(), 3259 T); 3260 3261 if (TagType *TT = dyn_cast<TagType>(T)) { 3262 TagDecl *TD = TT->getDecl(); 3263 3264 // If the TagDecl that the TypedefDecl points to is an anonymous decl 3265 // keep track of the TypedefDecl. 3266 if (!TD->getIdentifier() && !TD->getTypedefForAnonDecl()) 3267 TD->setTypedefForAnonDecl(NewTD); 3268 } 3269 3270 if (D.isInvalidType()) 3271 NewTD->setInvalidDecl(); 3272 return NewTD; 3273} 3274 3275 3276/// \brief Determine whether a tag with a given kind is acceptable 3277/// as a redeclaration of the given tag declaration. 3278/// 3279/// \returns true if the new tag kind is acceptable, false otherwise. 3280bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, 3281 TagDecl::TagKind NewTag, 3282 SourceLocation NewTagLoc, 3283 const IdentifierInfo &Name) { 3284 // C++ [dcl.type.elab]p3: 3285 // The class-key or enum keyword present in the 3286 // elaborated-type-specifier shall agree in kind with the 3287 // declaration to which the name in theelaborated-type-specifier 3288 // refers. This rule also applies to the form of 3289 // elaborated-type-specifier that declares a class-name or 3290 // friend class since it can be construed as referring to the 3291 // definition of the class. Thus, in any 3292 // elaborated-type-specifier, the enum keyword shall be used to 3293 // refer to an enumeration (7.2), the union class-keyshall be 3294 // used to refer to a union (clause 9), and either the class or 3295 // struct class-key shall be used to refer to a class (clause 9) 3296 // declared using the class or struct class-key. 3297 TagDecl::TagKind OldTag = Previous->getTagKind(); 3298 if (OldTag == NewTag) 3299 return true; 3300 3301 if ((OldTag == TagDecl::TK_struct || OldTag == TagDecl::TK_class) && 3302 (NewTag == TagDecl::TK_struct || NewTag == TagDecl::TK_class)) { 3303 // Warn about the struct/class tag mismatch. 3304 bool isTemplate = false; 3305 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) 3306 isTemplate = Record->getDescribedClassTemplate(); 3307 3308 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 3309 << (NewTag == TagDecl::TK_class) 3310 << isTemplate << &Name 3311 << CodeModificationHint::CreateReplacement(SourceRange(NewTagLoc), 3312 OldTag == TagDecl::TK_class? "class" : "struct"); 3313 Diag(Previous->getLocation(), diag::note_previous_use); 3314 return true; 3315 } 3316 return false; 3317} 3318 3319/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 3320/// former case, Name will be non-null. In the later case, Name will be null. 3321/// TagSpec indicates what kind of tag this is. TK indicates whether this is a 3322/// reference/declaration/definition of a tag. 3323Sema::DeclPtrTy Sema::ActOnTag(Scope *S, unsigned TagSpec, TagKind TK, 3324 SourceLocation KWLoc, const CXXScopeSpec &SS, 3325 IdentifierInfo *Name, SourceLocation NameLoc, 3326 AttributeList *Attr, AccessSpecifier AS, 3327 bool &OwnedDecl) { 3328 // If this is not a definition, it must have a name. 3329 assert((Name != 0 || TK == TK_Definition) && 3330 "Nameless record must be a definition!"); 3331 3332 OwnedDecl = false; 3333 TagDecl::TagKind Kind; 3334 switch (TagSpec) { 3335 default: assert(0 && "Unknown tag type!"); 3336 case DeclSpec::TST_struct: Kind = TagDecl::TK_struct; break; 3337 case DeclSpec::TST_union: Kind = TagDecl::TK_union; break; 3338 case DeclSpec::TST_class: Kind = TagDecl::TK_class; break; 3339 case DeclSpec::TST_enum: Kind = TagDecl::TK_enum; break; 3340 } 3341 3342 DeclContext *SearchDC = CurContext; 3343 DeclContext *DC = CurContext; 3344 NamedDecl *PrevDecl = 0; 3345 3346 bool Invalid = false; 3347 3348 if (Name && SS.isNotEmpty()) { 3349 // We have a nested-name tag ('struct foo::bar'). 3350 3351 // Check for invalid 'foo::'. 3352 if (SS.isInvalid()) { 3353 Name = 0; 3354 goto CreateNewDecl; 3355 } 3356 3357 if (RequireCompleteDeclContext(SS)) 3358 return DeclPtrTy::make((Decl *)0); 3359 3360 DC = computeDeclContext(SS); 3361 SearchDC = DC; 3362 // Look-up name inside 'foo::'. 3363 PrevDecl 3364 = dyn_cast_or_null<TagDecl>( 3365 LookupQualifiedName(DC, Name, LookupTagName, true).getAsDecl()); 3366 3367 // A tag 'foo::bar' must already exist. 3368 if (PrevDecl == 0) { 3369 Diag(NameLoc, diag::err_not_tag_in_scope) << Name << SS.getRange(); 3370 Name = 0; 3371 Invalid = true; 3372 goto CreateNewDecl; 3373 } 3374 } else if (Name) { 3375 // If this is a named struct, check to see if there was a previous forward 3376 // declaration or definition. 3377 // FIXME: We're looking into outer scopes here, even when we 3378 // shouldn't be. Doing so can result in ambiguities that we 3379 // shouldn't be diagnosing. 3380 LookupResult R = LookupName(S, Name, LookupTagName, 3381 /*RedeclarationOnly=*/(TK != TK_Reference)); 3382 if (R.isAmbiguous()) { 3383 DiagnoseAmbiguousLookup(R, Name, NameLoc); 3384 // FIXME: This is not best way to recover from case like: 3385 // 3386 // struct S s; 3387 // 3388 // causes needless "incomplete type" error later. 3389 Name = 0; 3390 PrevDecl = 0; 3391 Invalid = true; 3392 } 3393 else 3394 PrevDecl = R; 3395 3396 if (!getLangOptions().CPlusPlus && TK != TK_Reference) { 3397 // FIXME: This makes sure that we ignore the contexts associated 3398 // with C structs, unions, and enums when looking for a matching 3399 // tag declaration or definition. See the similar lookup tweak 3400 // in Sema::LookupName; is there a better way to deal with this? 3401 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 3402 SearchDC = SearchDC->getParent(); 3403 } 3404 } 3405 3406 if (PrevDecl && PrevDecl->isTemplateParameter()) { 3407 // Maybe we will complain about the shadowed template parameter. 3408 DiagnoseTemplateParameterShadow(NameLoc, PrevDecl); 3409 // Just pretend that we didn't see the previous declaration. 3410 PrevDecl = 0; 3411 } 3412 3413 if (PrevDecl) { 3414 // Check whether the previous declaration is usable. 3415 (void)DiagnoseUseOfDecl(PrevDecl, NameLoc); 3416 3417 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 3418 // If this is a use of a previous tag, or if the tag is already declared 3419 // in the same scope (so that the definition/declaration completes or 3420 // rementions the tag), reuse the decl. 3421 if (TK == TK_Reference || isDeclInScope(PrevDecl, SearchDC, S)) { 3422 // Make sure that this wasn't declared as an enum and now used as a 3423 // struct or something similar. 3424 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, KWLoc, *Name)) { 3425 bool SafeToContinue 3426 = (PrevTagDecl->getTagKind() != TagDecl::TK_enum && 3427 Kind != TagDecl::TK_enum); 3428 if (SafeToContinue) 3429 Diag(KWLoc, diag::err_use_with_wrong_tag) 3430 << Name 3431 << CodeModificationHint::CreateReplacement(SourceRange(KWLoc), 3432 PrevTagDecl->getKindName()); 3433 else 3434 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 3435 Diag(PrevDecl->getLocation(), diag::note_previous_use); 3436 3437 if (SafeToContinue) 3438 Kind = PrevTagDecl->getTagKind(); 3439 else { 3440 // Recover by making this an anonymous redefinition. 3441 Name = 0; 3442 PrevDecl = 0; 3443 Invalid = true; 3444 } 3445 } 3446 3447 if (!Invalid) { 3448 // If this is a use, just return the declaration we found. 3449 3450 // FIXME: In the future, return a variant or some other clue 3451 // for the consumer of this Decl to know it doesn't own it. 3452 // For our current ASTs this shouldn't be a problem, but will 3453 // need to be changed with DeclGroups. 3454 if (TK == TK_Reference) 3455 return DeclPtrTy::make(PrevDecl); 3456 3457 // Diagnose attempts to redefine a tag. 3458 if (TK == TK_Definition) { 3459 if (TagDecl *Def = PrevTagDecl->getDefinition(Context)) { 3460 Diag(NameLoc, diag::err_redefinition) << Name; 3461 Diag(Def->getLocation(), diag::note_previous_definition); 3462 // If this is a redefinition, recover by making this 3463 // struct be anonymous, which will make any later 3464 // references get the previous definition. 3465 Name = 0; 3466 PrevDecl = 0; 3467 Invalid = true; 3468 } else { 3469 // If the type is currently being defined, complain 3470 // about a nested redefinition. 3471 TagType *Tag = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 3472 if (Tag->isBeingDefined()) { 3473 Diag(NameLoc, diag::err_nested_redefinition) << Name; 3474 Diag(PrevTagDecl->getLocation(), 3475 diag::note_previous_definition); 3476 Name = 0; 3477 PrevDecl = 0; 3478 Invalid = true; 3479 } 3480 } 3481 3482 // Okay, this is definition of a previously declared or referenced 3483 // tag PrevDecl. We're going to create a new Decl for it. 3484 } 3485 } 3486 // If we get here we have (another) forward declaration or we 3487 // have a definition. Just create a new decl. 3488 } else { 3489 // If we get here, this is a definition of a new tag type in a nested 3490 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 3491 // new decl/type. We set PrevDecl to NULL so that the entities 3492 // have distinct types. 3493 PrevDecl = 0; 3494 } 3495 // If we get here, we're going to create a new Decl. If PrevDecl 3496 // is non-NULL, it's a definition of the tag declared by 3497 // PrevDecl. If it's NULL, we have a new definition. 3498 } else { 3499 // PrevDecl is a namespace, template, or anything else 3500 // that lives in the IDNS_Tag identifier namespace. 3501 if (isDeclInScope(PrevDecl, SearchDC, S)) { 3502 // The tag name clashes with a namespace name, issue an error and 3503 // recover by making this tag be anonymous. 3504 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 3505 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3506 Name = 0; 3507 PrevDecl = 0; 3508 Invalid = true; 3509 } else { 3510 // The existing declaration isn't relevant to us; we're in a 3511 // new scope, so clear out the previous declaration. 3512 PrevDecl = 0; 3513 } 3514 } 3515 } else if (TK == TK_Reference && SS.isEmpty() && Name && 3516 (Kind != TagDecl::TK_enum || !getLangOptions().CPlusPlus)) { 3517 // C++ [basic.scope.pdecl]p5: 3518 // -- for an elaborated-type-specifier of the form 3519 // 3520 // class-key identifier 3521 // 3522 // if the elaborated-type-specifier is used in the 3523 // decl-specifier-seq or parameter-declaration-clause of a 3524 // function defined in namespace scope, the identifier is 3525 // declared as a class-name in the namespace that contains 3526 // the declaration; otherwise, except as a friend 3527 // declaration, the identifier is declared in the smallest 3528 // non-class, non-function-prototype scope that contains the 3529 // declaration. 3530 // 3531 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 3532 // C structs and unions. 3533 // 3534 // GNU C also supports this behavior as part of its incomplete 3535 // enum types extension, while GNU C++ does not. 3536 // 3537 // Find the context where we'll be declaring the tag. 3538 // FIXME: We would like to maintain the current DeclContext as the 3539 // lexical context, 3540 while (SearchDC->isRecord()) 3541 SearchDC = SearchDC->getParent(); 3542 3543 // Find the scope where we'll be declaring the tag. 3544 while (S->isClassScope() || 3545 (getLangOptions().CPlusPlus && S->isFunctionPrototypeScope()) || 3546 ((S->getFlags() & Scope::DeclScope) == 0) || 3547 (S->getEntity() && 3548 ((DeclContext *)S->getEntity())->isTransparentContext())) 3549 S = S->getParent(); 3550 } 3551 3552CreateNewDecl: 3553 3554 // If there is an identifier, use the location of the identifier as the 3555 // location of the decl, otherwise use the location of the struct/union 3556 // keyword. 3557 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 3558 3559 // Otherwise, create a new declaration. If there is a previous 3560 // declaration of the same entity, the two will be linked via 3561 // PrevDecl. 3562 TagDecl *New; 3563 3564 if (Kind == TagDecl::TK_enum) { 3565 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 3566 // enum X { A, B, C } D; D should chain to X. 3567 New = EnumDecl::Create(Context, SearchDC, Loc, Name, 3568 cast_or_null<EnumDecl>(PrevDecl)); 3569 // If this is an undefined enum, warn. 3570 if (TK != TK_Definition && !Invalid) { 3571 unsigned DK = getLangOptions().CPlusPlus? diag::err_forward_ref_enum 3572 : diag::ext_forward_ref_enum; 3573 Diag(Loc, DK); 3574 } 3575 } else { 3576 // struct/union/class 3577 3578 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 3579 // struct X { int A; } D; D should chain to X. 3580 if (getLangOptions().CPlusPlus) 3581 // FIXME: Look for a way to use RecordDecl for simple structs. 3582 New = CXXRecordDecl::Create(Context, Kind, SearchDC, Loc, Name, 3583 cast_or_null<CXXRecordDecl>(PrevDecl)); 3584 else 3585 New = RecordDecl::Create(Context, Kind, SearchDC, Loc, Name, 3586 cast_or_null<RecordDecl>(PrevDecl)); 3587 } 3588 3589 if (Kind != TagDecl::TK_enum) { 3590 // Handle #pragma pack: if the #pragma pack stack has non-default 3591 // alignment, make up a packed attribute for this decl. These 3592 // attributes are checked when the ASTContext lays out the 3593 // structure. 3594 // 3595 // It is important for implementing the correct semantics that this 3596 // happen here (in act on tag decl). The #pragma pack stack is 3597 // maintained as a result of parser callbacks which can occur at 3598 // many points during the parsing of a struct declaration (because 3599 // the #pragma tokens are effectively skipped over during the 3600 // parsing of the struct). 3601 if (unsigned Alignment = getPragmaPackAlignment()) 3602 New->addAttr(::new (Context) PackedAttr(Alignment * 8)); 3603 } 3604 3605 if (getLangOptions().CPlusPlus && SS.isEmpty() && Name && !Invalid) { 3606 // C++ [dcl.typedef]p3: 3607 // [...] Similarly, in a given scope, a class or enumeration 3608 // shall not be declared with the same name as a typedef-name 3609 // that is declared in that scope and refers to a type other 3610 // than the class or enumeration itself. 3611 LookupResult Lookup = LookupName(S, Name, LookupOrdinaryName, true); 3612 TypedefDecl *PrevTypedef = 0; 3613 if (Lookup.getKind() == LookupResult::Found) 3614 PrevTypedef = dyn_cast<TypedefDecl>(Lookup.getAsDecl()); 3615 3616 if (PrevTypedef && isDeclInScope(PrevTypedef, SearchDC, S) && 3617 Context.getCanonicalType(Context.getTypeDeclType(PrevTypedef)) != 3618 Context.getCanonicalType(Context.getTypeDeclType(New))) { 3619 Diag(Loc, diag::err_tag_definition_of_typedef) 3620 << Context.getTypeDeclType(New) 3621 << PrevTypedef->getUnderlyingType(); 3622 Diag(PrevTypedef->getLocation(), diag::note_previous_definition); 3623 Invalid = true; 3624 } 3625 } 3626 3627 if (Invalid) 3628 New->setInvalidDecl(); 3629 3630 if (Attr) 3631 ProcessDeclAttributeList(New, Attr); 3632 3633 // If we're declaring or defining a tag in function prototype scope 3634 // in C, note that this type can only be used within the function. 3635 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 3636 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 3637 3638 // Set the lexical context. If the tag has a C++ scope specifier, the 3639 // lexical context will be different from the semantic context. 3640 New->setLexicalDeclContext(CurContext); 3641 3642 // Set the access specifier. 3643 if (!Invalid) 3644 SetMemberAccessSpecifier(New, PrevDecl, AS); 3645 3646 if (TK == TK_Definition) 3647 New->startDefinition(); 3648 3649 // If this has an identifier, add it to the scope stack. 3650 if (Name) { 3651 S = getNonFieldDeclScope(S); 3652 PushOnScopeChains(New, S); 3653 } else { 3654 CurContext->addDecl(Context, New); 3655 } 3656 3657 OwnedDecl = true; 3658 return DeclPtrTy::make(New); 3659} 3660 3661void Sema::ActOnTagStartDefinition(Scope *S, DeclPtrTy TagD) { 3662 AdjustDeclIfTemplate(TagD); 3663 TagDecl *Tag = cast<TagDecl>(TagD.getAs<Decl>()); 3664 3665 // Enter the tag context. 3666 PushDeclContext(S, Tag); 3667 3668 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Tag)) { 3669 FieldCollector->StartClass(); 3670 3671 if (Record->getIdentifier()) { 3672 // C++ [class]p2: 3673 // [...] The class-name is also inserted into the scope of the 3674 // class itself; this is known as the injected-class-name. For 3675 // purposes of access checking, the injected-class-name is treated 3676 // as if it were a public member name. 3677 CXXRecordDecl *InjectedClassName 3678 = CXXRecordDecl::Create(Context, Record->getTagKind(), 3679 CurContext, Record->getLocation(), 3680 Record->getIdentifier(), Record); 3681 InjectedClassName->setImplicit(); 3682 InjectedClassName->setAccess(AS_public); 3683 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 3684 InjectedClassName->setDescribedClassTemplate(Template); 3685 PushOnScopeChains(InjectedClassName, S); 3686 assert(InjectedClassName->isInjectedClassName() && 3687 "Broken injected-class-name"); 3688 } 3689 } 3690} 3691 3692void Sema::ActOnTagFinishDefinition(Scope *S, DeclPtrTy TagD) { 3693 AdjustDeclIfTemplate(TagD); 3694 TagDecl *Tag = cast<TagDecl>(TagD.getAs<Decl>()); 3695 3696 if (isa<CXXRecordDecl>(Tag)) 3697 FieldCollector->FinishClass(); 3698 3699 // Exit this scope of this tag's definition. 3700 PopDeclContext(); 3701 3702 // Notify the consumer that we've defined a tag. 3703 Consumer.HandleTagDeclDefinition(Tag); 3704} 3705 3706// Note that FieldName may be null for anonymous bitfields. 3707bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName, 3708 QualType FieldTy, const Expr *BitWidth) { 3709 3710 // C99 6.7.2.1p4 - verify the field type. 3711 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 3712 if (!FieldTy->isDependentType() && !FieldTy->isIntegralType()) { 3713 // Handle incomplete types with specific error. 3714 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 3715 return true; 3716 if (FieldName) 3717 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 3718 << FieldName << FieldTy << BitWidth->getSourceRange(); 3719 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) 3720 << FieldTy << BitWidth->getSourceRange(); 3721 } 3722 3723 // If the bit-width is type- or value-dependent, don't try to check 3724 // it now. 3725 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 3726 return false; 3727 3728 llvm::APSInt Value; 3729 if (VerifyIntegerConstantExpression(BitWidth, &Value)) 3730 return true; 3731 3732 // Zero-width bitfield is ok for anonymous field. 3733 if (Value == 0 && FieldName) 3734 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 3735 3736 if (Value.isSigned() && Value.isNegative()) { 3737 if (FieldName) 3738 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 3739 << FieldName << Value.toString(10); 3740 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) 3741 << Value.toString(10); 3742 } 3743 3744 if (!FieldTy->isDependentType()) { 3745 uint64_t TypeSize = Context.getTypeSize(FieldTy); 3746 if (Value.getZExtValue() > TypeSize) { 3747 if (FieldName) 3748 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 3749 << FieldName << (unsigned)TypeSize; 3750 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) 3751 << (unsigned)TypeSize; 3752 } 3753 } 3754 3755 return false; 3756} 3757 3758/// ActOnField - Each field of a struct/union/class is passed into this in order 3759/// to create a FieldDecl object for it. 3760Sema::DeclPtrTy Sema::ActOnField(Scope *S, DeclPtrTy TagD, 3761 SourceLocation DeclStart, 3762 Declarator &D, ExprTy *BitfieldWidth) { 3763 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD.getAs<Decl>()), 3764 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 3765 AS_public); 3766 return DeclPtrTy::make(Res); 3767} 3768 3769/// HandleField - Analyze a field of a C struct or a C++ data member. 3770/// 3771FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 3772 SourceLocation DeclStart, 3773 Declarator &D, Expr *BitWidth, 3774 AccessSpecifier AS) { 3775 IdentifierInfo *II = D.getIdentifier(); 3776 SourceLocation Loc = DeclStart; 3777 if (II) Loc = D.getIdentifierLoc(); 3778 3779 QualType T = GetTypeForDeclarator(D, S); 3780 if (getLangOptions().CPlusPlus) 3781 CheckExtraCXXDefaultArguments(D); 3782 3783 DiagnoseFunctionSpecifiers(D); 3784 3785 if (D.getDeclSpec().isThreadSpecified()) 3786 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 3787 3788 NamedDecl *PrevDecl = LookupName(S, II, LookupMemberName, true); 3789 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 3790 PrevDecl = 0; 3791 3792 FieldDecl *NewFD 3793 = CheckFieldDecl(II, T, Record, Loc, 3794 D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable, 3795 BitWidth, AS, PrevDecl, &D); 3796 if (NewFD->isInvalidDecl() && PrevDecl) { 3797 // Don't introduce NewFD into scope; there's already something 3798 // with the same name in the same scope. 3799 } else if (II) { 3800 PushOnScopeChains(NewFD, S); 3801 } else 3802 Record->addDecl(Context, NewFD); 3803 3804 return NewFD; 3805} 3806 3807/// \brief Build a new FieldDecl and check its well-formedness. 3808/// 3809/// This routine builds a new FieldDecl given the fields name, type, 3810/// record, etc. \p PrevDecl should refer to any previous declaration 3811/// with the same name and in the same scope as the field to be 3812/// created. 3813/// 3814/// \returns a new FieldDecl. 3815/// 3816/// \todo The Declarator argument is a hack. It will be removed once 3817FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 3818 RecordDecl *Record, SourceLocation Loc, 3819 bool Mutable, Expr *BitWidth, 3820 AccessSpecifier AS, NamedDecl *PrevDecl, 3821 Declarator *D) { 3822 IdentifierInfo *II = Name.getAsIdentifierInfo(); 3823 bool InvalidDecl = false; 3824 if (D) InvalidDecl = D->isInvalidType(); 3825 3826 // If we receive a broken type, recover by assuming 'int' and 3827 // marking this declaration as invalid. 3828 if (T.isNull()) { 3829 InvalidDecl = true; 3830 T = Context.IntTy; 3831 } 3832 3833 // C99 6.7.2.1p8: A member of a structure or union may have any type other 3834 // than a variably modified type. 3835 if (T->isVariablyModifiedType()) { 3836 bool SizeIsNegative; 3837 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 3838 SizeIsNegative); 3839 if (!FixedTy.isNull()) { 3840 Diag(Loc, diag::warn_illegal_constant_array_size); 3841 T = FixedTy; 3842 } else { 3843 if (SizeIsNegative) 3844 Diag(Loc, diag::err_typecheck_negative_array_size); 3845 else 3846 Diag(Loc, diag::err_typecheck_field_variable_size); 3847 T = Context.IntTy; 3848 InvalidDecl = true; 3849 } 3850 } 3851 3852 // Fields can not have abstract class types 3853 if (RequireNonAbstractType(Loc, T, diag::err_abstract_type_in_decl, 3854 AbstractFieldType)) 3855 InvalidDecl = true; 3856 3857 // If this is declared as a bit-field, check the bit-field. 3858 if (BitWidth && VerifyBitField(Loc, II, T, BitWidth)) { 3859 InvalidDecl = true; 3860 DeleteExpr(BitWidth); 3861 BitWidth = 0; 3862 } 3863 3864 FieldDecl *NewFD = FieldDecl::Create(Context, Record, Loc, II, T, BitWidth, 3865 Mutable); 3866 if (InvalidDecl) 3867 NewFD->setInvalidDecl(); 3868 3869 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 3870 Diag(Loc, diag::err_duplicate_member) << II; 3871 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 3872 NewFD->setInvalidDecl(); 3873 } 3874 3875 if (getLangOptions().CPlusPlus && !T->isPODType()) 3876 cast<CXXRecordDecl>(Record)->setPOD(false); 3877 3878 // FIXME: We need to pass in the attributes given an AST 3879 // representation, not a parser representation. 3880 if (D) 3881 ProcessDeclAttributes(NewFD, *D); 3882 3883 if (T.isObjCGCWeak()) 3884 Diag(Loc, diag::warn_attribute_weak_on_field); 3885 3886 NewFD->setAccess(AS); 3887 3888 // C++ [dcl.init.aggr]p1: 3889 // An aggregate is an array or a class (clause 9) with [...] no 3890 // private or protected non-static data members (clause 11). 3891 // A POD must be an aggregate. 3892 if (getLangOptions().CPlusPlus && 3893 (AS == AS_private || AS == AS_protected)) { 3894 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record); 3895 CXXRecord->setAggregate(false); 3896 CXXRecord->setPOD(false); 3897 } 3898 3899 return NewFD; 3900} 3901 3902/// TranslateIvarVisibility - Translate visibility from a token ID to an 3903/// AST enum value. 3904static ObjCIvarDecl::AccessControl 3905TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 3906 switch (ivarVisibility) { 3907 default: assert(0 && "Unknown visitibility kind"); 3908 case tok::objc_private: return ObjCIvarDecl::Private; 3909 case tok::objc_public: return ObjCIvarDecl::Public; 3910 case tok::objc_protected: return ObjCIvarDecl::Protected; 3911 case tok::objc_package: return ObjCIvarDecl::Package; 3912 } 3913} 3914 3915/// ActOnIvar - Each ivar field of an objective-c class is passed into this 3916/// in order to create an IvarDecl object for it. 3917Sema::DeclPtrTy Sema::ActOnIvar(Scope *S, 3918 SourceLocation DeclStart, 3919 DeclPtrTy IntfDecl, 3920 Declarator &D, ExprTy *BitfieldWidth, 3921 tok::ObjCKeywordKind Visibility) { 3922 3923 IdentifierInfo *II = D.getIdentifier(); 3924 Expr *BitWidth = (Expr*)BitfieldWidth; 3925 SourceLocation Loc = DeclStart; 3926 if (II) Loc = D.getIdentifierLoc(); 3927 3928 // FIXME: Unnamed fields can be handled in various different ways, for 3929 // example, unnamed unions inject all members into the struct namespace! 3930 3931 QualType T = GetTypeForDeclarator(D, S); 3932 3933 if (BitWidth) { 3934 // 6.7.2.1p3, 6.7.2.1p4 3935 if (VerifyBitField(Loc, II, T, BitWidth)) { 3936 D.setInvalidType(); 3937 DeleteExpr(BitWidth); 3938 BitWidth = 0; 3939 } 3940 } else { 3941 // Not a bitfield. 3942 3943 // validate II. 3944 3945 } 3946 3947 // C99 6.7.2.1p8: A member of a structure or union may have any type other 3948 // than a variably modified type. 3949 if (T->isVariablyModifiedType()) { 3950 Diag(Loc, diag::err_typecheck_ivar_variable_size); 3951 D.setInvalidType(); 3952 } 3953 3954 // Get the visibility (access control) for this ivar. 3955 ObjCIvarDecl::AccessControl ac = 3956 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 3957 : ObjCIvarDecl::None; 3958 // Must set ivar's DeclContext to its enclosing interface. 3959 Decl *EnclosingDecl = IntfDecl.getAs<Decl>(); 3960 DeclContext *EnclosingContext; 3961 if (ObjCImplementationDecl *IMPDecl = 3962 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 3963 // Case of ivar declared in an implementation. Context is that of its class. 3964 ObjCInterfaceDecl* IDecl = IMPDecl->getClassInterface(); 3965 assert(IDecl && "No class- ActOnIvar"); 3966 EnclosingContext = cast_or_null<DeclContext>(IDecl); 3967 } 3968 else 3969 EnclosingContext = dyn_cast<DeclContext>(EnclosingDecl); 3970 assert(EnclosingContext && "null DeclContext for ivar - ActOnIvar"); 3971 3972 // Construct the decl. 3973 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, 3974 EnclosingContext, Loc, II, T,ac, 3975 (Expr *)BitfieldWidth); 3976 3977 if (II) { 3978 NamedDecl *PrevDecl = LookupName(S, II, LookupMemberName, true); 3979 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S) 3980 && !isa<TagDecl>(PrevDecl)) { 3981 Diag(Loc, diag::err_duplicate_member) << II; 3982 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 3983 NewID->setInvalidDecl(); 3984 } 3985 } 3986 3987 // Process attributes attached to the ivar. 3988 ProcessDeclAttributes(NewID, D); 3989 3990 if (D.isInvalidType()) 3991 NewID->setInvalidDecl(); 3992 3993 if (II) { 3994 // FIXME: When interfaces are DeclContexts, we'll need to add 3995 // these to the interface. 3996 S->AddDecl(DeclPtrTy::make(NewID)); 3997 IdResolver.AddDecl(NewID); 3998 } 3999 4000 return DeclPtrTy::make(NewID); 4001} 4002 4003void Sema::ActOnFields(Scope* S, 4004 SourceLocation RecLoc, DeclPtrTy RecDecl, 4005 DeclPtrTy *Fields, unsigned NumFields, 4006 SourceLocation LBrac, SourceLocation RBrac, 4007 AttributeList *Attr) { 4008 Decl *EnclosingDecl = RecDecl.getAs<Decl>(); 4009 assert(EnclosingDecl && "missing record or interface decl"); 4010 4011 // If the decl this is being inserted into is invalid, then it may be a 4012 // redeclaration or some other bogus case. Don't try to add fields to it. 4013 if (EnclosingDecl->isInvalidDecl()) { 4014 // FIXME: Deallocate fields? 4015 return; 4016 } 4017 4018 4019 // Verify that all the fields are okay. 4020 unsigned NumNamedMembers = 0; 4021 llvm::SmallVector<FieldDecl*, 32> RecFields; 4022 4023 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 4024 for (unsigned i = 0; i != NumFields; ++i) { 4025 FieldDecl *FD = cast<FieldDecl>(Fields[i].getAs<Decl>()); 4026 4027 // Get the type for the field. 4028 Type *FDTy = FD->getType().getTypePtr(); 4029 4030 if (!FD->isAnonymousStructOrUnion()) { 4031 // Remember all fields written by the user. 4032 RecFields.push_back(FD); 4033 } 4034 4035 // If the field is already invalid for some reason, don't emit more 4036 // diagnostics about it. 4037 if (FD->isInvalidDecl()) 4038 continue; 4039 4040 // C99 6.7.2.1p2: 4041 // A structure or union shall not contain a member with 4042 // incomplete or function type (hence, a structure shall not 4043 // contain an instance of itself, but may contain a pointer to 4044 // an instance of itself), except that the last member of a 4045 // structure with more than one named member may have incomplete 4046 // array type; such a structure (and any union containing, 4047 // possibly recursively, a member that is such a structure) 4048 // shall not be a member of a structure or an element of an 4049 // array. 4050 if (FDTy->isFunctionType()) { 4051 // Field declared as a function. 4052 Diag(FD->getLocation(), diag::err_field_declared_as_function) 4053 << FD->getDeclName(); 4054 FD->setInvalidDecl(); 4055 EnclosingDecl->setInvalidDecl(); 4056 continue; 4057 } else if (FDTy->isIncompleteArrayType() && i == NumFields - 1 && 4058 Record && Record->isStruct()) { 4059 // Flexible array member. 4060 if (NumNamedMembers < 1) { 4061 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 4062 << FD->getDeclName(); 4063 FD->setInvalidDecl(); 4064 EnclosingDecl->setInvalidDecl(); 4065 continue; 4066 } 4067 // Okay, we have a legal flexible array member at the end of the struct. 4068 if (Record) 4069 Record->setHasFlexibleArrayMember(true); 4070 } else if (!FDTy->isDependentType() && 4071 RequireCompleteType(FD->getLocation(), FD->getType(), 4072 diag::err_field_incomplete)) { 4073 // Incomplete type 4074 FD->setInvalidDecl(); 4075 EnclosingDecl->setInvalidDecl(); 4076 continue; 4077 } else if (const RecordType *FDTTy = FDTy->getAsRecordType()) { 4078 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 4079 // If this is a member of a union, then entire union becomes "flexible". 4080 if (Record && Record->isUnion()) { 4081 Record->setHasFlexibleArrayMember(true); 4082 } else { 4083 // If this is a struct/class and this is not the last element, reject 4084 // it. Note that GCC supports variable sized arrays in the middle of 4085 // structures. 4086 if (i != NumFields-1) 4087 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 4088 << FD->getDeclName() << FD->getType(); 4089 else { 4090 // We support flexible arrays at the end of structs in 4091 // other structs as an extension. 4092 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 4093 << FD->getDeclName(); 4094 if (Record) 4095 Record->setHasFlexibleArrayMember(true); 4096 } 4097 } 4098 } 4099 } else if (FDTy->isObjCInterfaceType()) { 4100 /// A field cannot be an Objective-c object 4101 Diag(FD->getLocation(), diag::err_statically_allocated_object); 4102 FD->setInvalidDecl(); 4103 EnclosingDecl->setInvalidDecl(); 4104 continue; 4105 } 4106 // Keep track of the number of named members. 4107 if (FD->getIdentifier()) 4108 ++NumNamedMembers; 4109 } 4110 4111 // Okay, we successfully defined 'Record'. 4112 if (Record) { 4113 Record->completeDefinition(Context); 4114 } else { 4115 ObjCIvarDecl **ClsFields = 4116 reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); 4117 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 4118 ID->setIVarList(ClsFields, RecFields.size(), Context); 4119 ID->setLocEnd(RBrac); 4120 // Add ivar's to class's DeclContext. 4121 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 4122 ClsFields[i]->setLexicalDeclContext(ID); 4123 ID->addDecl(Context, ClsFields[i]); 4124 } 4125 // Must enforce the rule that ivars in the base classes may not be 4126 // duplicates. 4127 if (ID->getSuperClass()) { 4128 for (ObjCInterfaceDecl::ivar_iterator IVI = ID->ivar_begin(), 4129 IVE = ID->ivar_end(); IVI != IVE; ++IVI) { 4130 ObjCIvarDecl* Ivar = (*IVI); 4131 4132 if (IdentifierInfo *II = Ivar->getIdentifier()) { 4133 ObjCIvarDecl* prevIvar = 4134 ID->getSuperClass()->lookupInstanceVariable(Context, II); 4135 if (prevIvar) { 4136 Diag(Ivar->getLocation(), diag::err_duplicate_member) << II; 4137 Diag(prevIvar->getLocation(), diag::note_previous_declaration); 4138 } 4139 } 4140 } 4141 } 4142 } else if (ObjCImplementationDecl *IMPDecl = 4143 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 4144 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 4145 for (unsigned I = 0, N = RecFields.size(); I != N; ++I) 4146 // Ivar declared in @implementation never belongs to the implementation. 4147 // Only it is in implementation's lexical context. 4148 ClsFields[I]->setLexicalDeclContext(IMPDecl); 4149 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 4150 } 4151 } 4152 4153 if (Attr) 4154 ProcessDeclAttributeList(Record, Attr); 4155} 4156 4157EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 4158 EnumConstantDecl *LastEnumConst, 4159 SourceLocation IdLoc, 4160 IdentifierInfo *Id, 4161 ExprArg val) { 4162 Expr *Val = (Expr *)val.get(); 4163 4164 llvm::APSInt EnumVal(32); 4165 QualType EltTy; 4166 if (Val && !Val->isTypeDependent()) { 4167 // Make sure to promote the operand type to int. 4168 UsualUnaryConversions(Val); 4169 if (Val != val.get()) { 4170 val.release(); 4171 val = Val; 4172 } 4173 4174 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 4175 SourceLocation ExpLoc; 4176 if (!Val->isValueDependent() && 4177 VerifyIntegerConstantExpression(Val, &EnumVal)) { 4178 Val = 0; 4179 } else { 4180 EltTy = Val->getType(); 4181 } 4182 } 4183 4184 if (!Val) { 4185 if (LastEnumConst) { 4186 // Assign the last value + 1. 4187 EnumVal = LastEnumConst->getInitVal(); 4188 ++EnumVal; 4189 4190 // Check for overflow on increment. 4191 if (EnumVal < LastEnumConst->getInitVal()) 4192 Diag(IdLoc, diag::warn_enum_value_overflow); 4193 4194 EltTy = LastEnumConst->getType(); 4195 } else { 4196 // First value, set to zero. 4197 EltTy = Context.IntTy; 4198 EnumVal.zextOrTrunc(static_cast<uint32_t>(Context.getTypeSize(EltTy))); 4199 } 4200 } 4201 4202 val.release(); 4203 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 4204 Val, EnumVal); 4205} 4206 4207 4208Sema::DeclPtrTy Sema::ActOnEnumConstant(Scope *S, DeclPtrTy theEnumDecl, 4209 DeclPtrTy lastEnumConst, 4210 SourceLocation IdLoc, 4211 IdentifierInfo *Id, 4212 SourceLocation EqualLoc, ExprTy *val) { 4213 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl.getAs<Decl>()); 4214 EnumConstantDecl *LastEnumConst = 4215 cast_or_null<EnumConstantDecl>(lastEnumConst.getAs<Decl>()); 4216 Expr *Val = static_cast<Expr*>(val); 4217 4218 // The scope passed in may not be a decl scope. Zip up the scope tree until 4219 // we find one that is. 4220 S = getNonFieldDeclScope(S); 4221 4222 // Verify that there isn't already something declared with this name in this 4223 // scope. 4224 NamedDecl *PrevDecl = LookupName(S, Id, LookupOrdinaryName); 4225 if (PrevDecl && PrevDecl->isTemplateParameter()) { 4226 // Maybe we will complain about the shadowed template parameter. 4227 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 4228 // Just pretend that we didn't see the previous declaration. 4229 PrevDecl = 0; 4230 } 4231 4232 if (PrevDecl) { 4233 // When in C++, we may get a TagDecl with the same name; in this case the 4234 // enum constant will 'hide' the tag. 4235 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 4236 "Received TagDecl when not in C++!"); 4237 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 4238 if (isa<EnumConstantDecl>(PrevDecl)) 4239 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 4240 else 4241 Diag(IdLoc, diag::err_redefinition) << Id; 4242 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4243 if (Val) Val->Destroy(Context); 4244 return DeclPtrTy(); 4245 } 4246 } 4247 4248 EnumConstantDecl *New = CheckEnumConstant(TheEnumDecl, LastEnumConst, 4249 IdLoc, Id, Owned(Val)); 4250 4251 // Register this decl in the current scope stack. 4252 if (New) 4253 PushOnScopeChains(New, S); 4254 4255 return DeclPtrTy::make(New); 4256} 4257 4258void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc, 4259 SourceLocation RBraceLoc, DeclPtrTy EnumDeclX, 4260 DeclPtrTy *Elements, unsigned NumElements) { 4261 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX.getAs<Decl>()); 4262 QualType EnumType = Context.getTypeDeclType(Enum); 4263 4264 // TODO: If the result value doesn't fit in an int, it must be a long or long 4265 // long value. ISO C does not support this, but GCC does as an extension, 4266 // emit a warning. 4267 unsigned IntWidth = Context.Target.getIntWidth(); 4268 4269 // Verify that all the values are okay, compute the size of the values, and 4270 // reverse the list. 4271 unsigned NumNegativeBits = 0; 4272 unsigned NumPositiveBits = 0; 4273 4274 // Keep track of whether all elements have type int. 4275 bool AllElementsInt = true; 4276 4277 for (unsigned i = 0; i != NumElements; ++i) { 4278 EnumConstantDecl *ECD = 4279 cast_or_null<EnumConstantDecl>(Elements[i].getAs<Decl>()); 4280 if (!ECD) continue; // Already issued a diagnostic. 4281 4282 // If the enum value doesn't fit in an int, emit an extension warning. 4283 const llvm::APSInt &InitVal = ECD->getInitVal(); 4284 assert(InitVal.getBitWidth() >= IntWidth && 4285 "Should have promoted value to int"); 4286 if (InitVal.getBitWidth() > IntWidth) { 4287 llvm::APSInt V(InitVal); 4288 V.trunc(IntWidth); 4289 V.extend(InitVal.getBitWidth()); 4290 if (V != InitVal) 4291 Diag(ECD->getLocation(), diag::ext_enum_value_not_int) 4292 << InitVal.toString(10); 4293 } 4294 4295 // Keep track of the size of positive and negative values. 4296 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 4297 NumPositiveBits = std::max(NumPositiveBits, 4298 (unsigned)InitVal.getActiveBits()); 4299 else 4300 NumNegativeBits = std::max(NumNegativeBits, 4301 (unsigned)InitVal.getMinSignedBits()); 4302 4303 // Keep track of whether every enum element has type int (very commmon). 4304 if (AllElementsInt) 4305 AllElementsInt = ECD->getType() == Context.IntTy; 4306 } 4307 4308 // Figure out the type that should be used for this enum. 4309 // FIXME: Support attribute(packed) on enums and -fshort-enums. 4310 QualType BestType; 4311 unsigned BestWidth; 4312 4313 if (NumNegativeBits) { 4314 // If there is a negative value, figure out the smallest integer type (of 4315 // int/long/longlong) that fits. 4316 if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 4317 BestType = Context.IntTy; 4318 BestWidth = IntWidth; 4319 } else { 4320 BestWidth = Context.Target.getLongWidth(); 4321 4322 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) 4323 BestType = Context.LongTy; 4324 else { 4325 BestWidth = Context.Target.getLongLongWidth(); 4326 4327 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 4328 Diag(Enum->getLocation(), diag::warn_enum_too_large); 4329 BestType = Context.LongLongTy; 4330 } 4331 } 4332 } else { 4333 // If there is no negative value, figure out which of uint, ulong, ulonglong 4334 // fits. 4335 if (NumPositiveBits <= IntWidth) { 4336 BestType = Context.UnsignedIntTy; 4337 BestWidth = IntWidth; 4338 } else if (NumPositiveBits <= 4339 (BestWidth = Context.Target.getLongWidth())) { 4340 BestType = Context.UnsignedLongTy; 4341 } else { 4342 BestWidth = Context.Target.getLongLongWidth(); 4343 assert(NumPositiveBits <= BestWidth && 4344 "How could an initializer get larger than ULL?"); 4345 BestType = Context.UnsignedLongLongTy; 4346 } 4347 } 4348 4349 // Loop over all of the enumerator constants, changing their types to match 4350 // the type of the enum if needed. 4351 for (unsigned i = 0; i != NumElements; ++i) { 4352 EnumConstantDecl *ECD = 4353 cast_or_null<EnumConstantDecl>(Elements[i].getAs<Decl>()); 4354 if (!ECD) continue; // Already issued a diagnostic. 4355 4356 // Standard C says the enumerators have int type, but we allow, as an 4357 // extension, the enumerators to be larger than int size. If each 4358 // enumerator value fits in an int, type it as an int, otherwise type it the 4359 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 4360 // that X has type 'int', not 'unsigned'. 4361 if (ECD->getType() == Context.IntTy) { 4362 // Make sure the init value is signed. 4363 llvm::APSInt IV = ECD->getInitVal(); 4364 IV.setIsSigned(true); 4365 ECD->setInitVal(IV); 4366 4367 if (getLangOptions().CPlusPlus) 4368 // C++ [dcl.enum]p4: Following the closing brace of an 4369 // enum-specifier, each enumerator has the type of its 4370 // enumeration. 4371 ECD->setType(EnumType); 4372 continue; // Already int type. 4373 } 4374 4375 // Determine whether the value fits into an int. 4376 llvm::APSInt InitVal = ECD->getInitVal(); 4377 bool FitsInInt; 4378 if (InitVal.isUnsigned() || !InitVal.isNegative()) 4379 FitsInInt = InitVal.getActiveBits() < IntWidth; 4380 else 4381 FitsInInt = InitVal.getMinSignedBits() <= IntWidth; 4382 4383 // If it fits into an integer type, force it. Otherwise force it to match 4384 // the enum decl type. 4385 QualType NewTy; 4386 unsigned NewWidth; 4387 bool NewSign; 4388 if (FitsInInt) { 4389 NewTy = Context.IntTy; 4390 NewWidth = IntWidth; 4391 NewSign = true; 4392 } else if (ECD->getType() == BestType) { 4393 // Already the right type! 4394 if (getLangOptions().CPlusPlus) 4395 // C++ [dcl.enum]p4: Following the closing brace of an 4396 // enum-specifier, each enumerator has the type of its 4397 // enumeration. 4398 ECD->setType(EnumType); 4399 continue; 4400 } else { 4401 NewTy = BestType; 4402 NewWidth = BestWidth; 4403 NewSign = BestType->isSignedIntegerType(); 4404 } 4405 4406 // Adjust the APSInt value. 4407 InitVal.extOrTrunc(NewWidth); 4408 InitVal.setIsSigned(NewSign); 4409 ECD->setInitVal(InitVal); 4410 4411 // Adjust the Expr initializer and type. 4412 if (ECD->getInitExpr()) 4413 ECD->setInitExpr(new (Context) ImplicitCastExpr(NewTy, ECD->getInitExpr(), 4414 /*isLvalue=*/false)); 4415 if (getLangOptions().CPlusPlus) 4416 // C++ [dcl.enum]p4: Following the closing brace of an 4417 // enum-specifier, each enumerator has the type of its 4418 // enumeration. 4419 ECD->setType(EnumType); 4420 else 4421 ECD->setType(NewTy); 4422 } 4423 4424 Enum->completeDefinition(Context, BestType); 4425} 4426 4427Sema::DeclPtrTy Sema::ActOnFileScopeAsmDecl(SourceLocation Loc, 4428 ExprArg expr) { 4429 StringLiteral *AsmString = cast<StringLiteral>(expr.takeAs<Expr>()); 4430 4431 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext, 4432 Loc, AsmString); 4433 CurContext->addDecl(Context, New); 4434 return DeclPtrTy::make(New); 4435} 4436 4437void Sema::ActOnPragmaWeakID(IdentifierInfo* Name, 4438 SourceLocation PragmaLoc, 4439 SourceLocation NameLoc) { 4440 Decl *PrevDecl = LookupName(TUScope, Name, LookupOrdinaryName); 4441 4442 // FIXME: This implementation is an ugly hack! 4443 if (PrevDecl) { 4444 PrevDecl->addAttr(::new (Context) WeakAttr()); 4445 return; 4446 } 4447 Diag(PragmaLoc, diag::err_unsupported_pragma_weak); 4448 return; 4449} 4450 4451void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name, 4452 IdentifierInfo* AliasName, 4453 SourceLocation PragmaLoc, 4454 SourceLocation NameLoc, 4455 SourceLocation AliasNameLoc) { 4456 Decl *PrevDecl = LookupName(TUScope, Name, LookupOrdinaryName); 4457 4458 // FIXME: This implementation is an ugly hack! 4459 if (PrevDecl) { 4460 PrevDecl->addAttr(::new (Context) AliasAttr(AliasName->getName())); 4461 PrevDecl->addAttr(::new (Context) WeakAttr()); 4462 return; 4463 } 4464 Diag(PragmaLoc, diag::err_unsupported_pragma_weak); 4465 return; 4466} 4467