SemaDecl.cpp revision 21ff9c99d3df1e4a13e6820fc2aa7a8cc6673198
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 "clang/AST/APValue.h" 16#include "clang/AST/ASTConsumer.h" 17#include "clang/AST/ASTContext.h" 18#include "clang/AST/DeclObjC.h" 19#include "clang/AST/DeclTemplate.h" 20#include "clang/AST/ExprCXX.h" 21#include "clang/Parse/DeclSpec.h" 22#include "clang/Basic/TargetInfo.h" 23#include "clang/Basic/SourceManager.h" 24// FIXME: layering (ideally, Sema shouldn't be dependent on Lex API's) 25#include "clang/Lex/Preprocessor.h" 26#include "clang/Lex/HeaderSearch.h" 27#include "llvm/ADT/SmallSet.h" 28#include "llvm/ADT/STLExtras.h" 29#include <algorithm> 30#include <functional> 31using namespace clang; 32 33/// getDeclName - Return a pretty name for the specified decl if possible, or 34/// an empty string if not. This is used for pretty crash reporting. 35std::string Sema::getDeclName(DeclTy *d) { 36 Decl *D = static_cast<Decl *>(d); 37 if (NamedDecl *DN = dyn_cast_or_null<NamedDecl>(D)) 38 return DN->getQualifiedNameAsString(); 39 return ""; 40} 41 42/// \brief If the identifier refers to a type name within this scope, 43/// return the declaration of that type. 44/// 45/// This routine performs ordinary name lookup of the identifier II 46/// within the given scope, with optional C++ scope specifier SS, to 47/// determine whether the name refers to a type. If so, returns an 48/// opaque pointer (actually a QualType) corresponding to that 49/// type. Otherwise, returns NULL. 50/// 51/// If name lookup results in an ambiguity, this routine will complain 52/// and then return NULL. 53Sema::TypeTy *Sema::getTypeName(IdentifierInfo &II, SourceLocation NameLoc, 54 Scope *S, const CXXScopeSpec *SS) { 55 NamedDecl *IIDecl = 0; 56 LookupResult Result = LookupParsedName(S, SS, &II, LookupOrdinaryName, 57 false, false); 58 switch (Result.getKind()) { 59 case LookupResult::NotFound: 60 case LookupResult::FoundOverloaded: 61 return 0; 62 63 case LookupResult::AmbiguousBaseSubobjectTypes: 64 case LookupResult::AmbiguousBaseSubobjects: 65 case LookupResult::AmbiguousReference: 66 DiagnoseAmbiguousLookup(Result, DeclarationName(&II), NameLoc); 67 return 0; 68 69 case LookupResult::Found: 70 IIDecl = Result.getAsDecl(); 71 break; 72 } 73 74 if (IIDecl) { 75 if (TypeDecl *TD = dyn_cast<TypeDecl>(IIDecl)) { 76 // Check whether we can use this type 77 (void)DiagnoseUseOfDecl(IIDecl, NameLoc); 78 79 return Context.getTypeDeclType(TD).getAsOpaquePtr(); 80 } 81 82 if (ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(IIDecl)) { 83 // Check whether we can use this interface. 84 (void)DiagnoseUseOfDecl(IIDecl, NameLoc); 85 86 return Context.getObjCInterfaceType(IDecl).getAsOpaquePtr(); 87 } 88 89 // Otherwise, could be a variable, function etc. 90 } 91 return 0; 92} 93 94DeclContext *Sema::getContainingDC(DeclContext *DC) { 95 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(DC)) { 96 // A C++ out-of-line method will return to the file declaration context. 97 if (MD->isOutOfLineDefinition()) 98 return MD->getLexicalDeclContext(); 99 100 // A C++ inline method is parsed *after* the topmost class it was declared 101 // in is fully parsed (it's "complete"). 102 // The parsing of a C++ inline method happens at the declaration context of 103 // the topmost (non-nested) class it is lexically declared in. 104 assert(isa<CXXRecordDecl>(MD->getParent()) && "C++ method not in Record."); 105 DC = MD->getParent(); 106 while (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC->getLexicalParent())) 107 DC = RD; 108 109 // Return the declaration context of the topmost class the inline method is 110 // declared in. 111 return DC; 112 } 113 114 if (isa<ObjCMethodDecl>(DC)) 115 return Context.getTranslationUnitDecl(); 116 117 return DC->getLexicalParent(); 118} 119 120void Sema::PushDeclContext(Scope *S, DeclContext *DC) { 121 assert(getContainingDC(DC) == CurContext && 122 "The next DeclContext should be lexically contained in the current one."); 123 CurContext = DC; 124 S->setEntity(DC); 125} 126 127void Sema::PopDeclContext() { 128 assert(CurContext && "DeclContext imbalance!"); 129 130 CurContext = getContainingDC(CurContext); 131} 132 133/// \brief Determine whether we allow overloading of the function 134/// PrevDecl with another declaration. 135/// 136/// This routine determines whether overloading is possible, not 137/// whether some new function is actually an overload. It will return 138/// true in C++ (where we can always provide overloads) or, as an 139/// extension, in C when the previous function is already an 140/// overloaded function declaration or has the "overloadable" 141/// attribute. 142static bool AllowOverloadingOfFunction(Decl *PrevDecl, ASTContext &Context) { 143 if (Context.getLangOptions().CPlusPlus) 144 return true; 145 146 if (isa<OverloadedFunctionDecl>(PrevDecl)) 147 return true; 148 149 return PrevDecl->getAttr<OverloadableAttr>() != 0; 150} 151 152/// Add this decl to the scope shadowed decl chains. 153void Sema::PushOnScopeChains(NamedDecl *D, Scope *S) { 154 // Move up the scope chain until we find the nearest enclosing 155 // non-transparent context. The declaration will be introduced into this 156 // scope. 157 while (S->getEntity() && 158 ((DeclContext *)S->getEntity())->isTransparentContext()) 159 S = S->getParent(); 160 161 S->AddDecl(D); 162 163 // Add scoped declarations into their context, so that they can be 164 // found later. Declarations without a context won't be inserted 165 // into any context. 166 CurContext->addDecl(D); 167 168 // C++ [basic.scope]p4: 169 // -- exactly one declaration shall declare a class name or 170 // enumeration name that is not a typedef name and the other 171 // declarations shall all refer to the same object or 172 // enumerator, or all refer to functions and function templates; 173 // in this case the class name or enumeration name is hidden. 174 if (TagDecl *TD = dyn_cast<TagDecl>(D)) { 175 // We are pushing the name of a tag (enum or class). 176 if (CurContext->getLookupContext() 177 == TD->getDeclContext()->getLookupContext()) { 178 // We're pushing the tag into the current context, which might 179 // require some reshuffling in the identifier resolver. 180 IdentifierResolver::iterator 181 I = IdResolver.begin(TD->getDeclName()), 182 IEnd = IdResolver.end(); 183 if (I != IEnd && isDeclInScope(*I, CurContext, S)) { 184 NamedDecl *PrevDecl = *I; 185 for (; I != IEnd && isDeclInScope(*I, CurContext, S); 186 PrevDecl = *I, ++I) { 187 if (TD->declarationReplaces(*I)) { 188 // This is a redeclaration. Remove it from the chain and 189 // break out, so that we'll add in the shadowed 190 // declaration. 191 S->RemoveDecl(*I); 192 if (PrevDecl == *I) { 193 IdResolver.RemoveDecl(*I); 194 IdResolver.AddDecl(TD); 195 return; 196 } else { 197 IdResolver.RemoveDecl(*I); 198 break; 199 } 200 } 201 } 202 203 // There is already a declaration with the same name in the same 204 // scope, which is not a tag declaration. It must be found 205 // before we find the new declaration, so insert the new 206 // declaration at the end of the chain. 207 IdResolver.AddShadowedDecl(TD, PrevDecl); 208 209 return; 210 } 211 } 212 } else if (isa<FunctionDecl>(D) && 213 AllowOverloadingOfFunction(D, Context)) { 214 // We are pushing the name of a function, which might be an 215 // overloaded name. 216 FunctionDecl *FD = cast<FunctionDecl>(D); 217 IdentifierResolver::iterator Redecl 218 = std::find_if(IdResolver.begin(FD->getDeclName()), 219 IdResolver.end(), 220 std::bind1st(std::mem_fun(&NamedDecl::declarationReplaces), 221 FD)); 222 if (Redecl != IdResolver.end() && S->isDeclScope(*Redecl)) { 223 // There is already a declaration of a function on our 224 // IdResolver chain. Replace it with this declaration. 225 S->RemoveDecl(*Redecl); 226 IdResolver.RemoveDecl(*Redecl); 227 } 228 } 229 230 IdResolver.AddDecl(D); 231} 232 233void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) { 234 if (S->decl_empty()) return; 235 assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) && 236 "Scope shouldn't contain decls!"); 237 238 for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end(); 239 I != E; ++I) { 240 Decl *TmpD = static_cast<Decl*>(*I); 241 assert(TmpD && "This decl didn't get pushed??"); 242 243 assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?"); 244 NamedDecl *D = cast<NamedDecl>(TmpD); 245 246 if (!D->getDeclName()) continue; 247 248 // Remove this name from our lexical scope. 249 IdResolver.RemoveDecl(D); 250 } 251} 252 253/// getObjCInterfaceDecl - Look up a for a class declaration in the scope. 254/// return 0 if one not found. 255ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *Id) { 256 // The third "scope" argument is 0 since we aren't enabling lazy built-in 257 // creation from this context. 258 NamedDecl *IDecl = LookupName(TUScope, Id, LookupOrdinaryName); 259 260 return dyn_cast_or_null<ObjCInterfaceDecl>(IDecl); 261} 262 263/// getNonFieldDeclScope - Retrieves the innermost scope, starting 264/// from S, where a non-field would be declared. This routine copes 265/// with the difference between C and C++ scoping rules in structs and 266/// unions. For example, the following code is well-formed in C but 267/// ill-formed in C++: 268/// @code 269/// struct S6 { 270/// enum { BAR } e; 271/// }; 272/// 273/// void test_S6() { 274/// struct S6 a; 275/// a.e = BAR; 276/// } 277/// @endcode 278/// For the declaration of BAR, this routine will return a different 279/// scope. The scope S will be the scope of the unnamed enumeration 280/// within S6. In C++, this routine will return the scope associated 281/// with S6, because the enumeration's scope is a transparent 282/// context but structures can contain non-field names. In C, this 283/// routine will return the translation unit scope, since the 284/// enumeration's scope is a transparent context and structures cannot 285/// contain non-field names. 286Scope *Sema::getNonFieldDeclScope(Scope *S) { 287 while (((S->getFlags() & Scope::DeclScope) == 0) || 288 (S->getEntity() && 289 ((DeclContext *)S->getEntity())->isTransparentContext()) || 290 (S->isClassScope() && !getLangOptions().CPlusPlus)) 291 S = S->getParent(); 292 return S; 293} 294 295void Sema::InitBuiltinVaListType() { 296 if (!Context.getBuiltinVaListType().isNull()) 297 return; 298 299 IdentifierInfo *VaIdent = &Context.Idents.get("__builtin_va_list"); 300 NamedDecl *VaDecl = LookupName(TUScope, VaIdent, LookupOrdinaryName); 301 TypedefDecl *VaTypedef = cast<TypedefDecl>(VaDecl); 302 Context.setBuiltinVaListType(Context.getTypedefType(VaTypedef)); 303} 304 305/// LazilyCreateBuiltin - The specified Builtin-ID was first used at 306/// file scope. lazily create a decl for it. ForRedeclaration is true 307/// if we're creating this built-in in anticipation of redeclaring the 308/// built-in. 309NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid, 310 Scope *S, bool ForRedeclaration, 311 SourceLocation Loc) { 312 Builtin::ID BID = (Builtin::ID)bid; 313 314 if (Context.BuiltinInfo.hasVAListUse(BID)) 315 InitBuiltinVaListType(); 316 317 Builtin::Context::GetBuiltinTypeError Error; 318 QualType R = Context.BuiltinInfo.GetBuiltinType(BID, Context, Error); 319 switch (Error) { 320 case Builtin::Context::GE_None: 321 // Okay 322 break; 323 324 case Builtin::Context::GE_Missing_FILE: 325 if (ForRedeclaration) 326 Diag(Loc, diag::err_implicit_decl_requires_stdio) 327 << Context.BuiltinInfo.GetName(BID); 328 return 0; 329 } 330 331 if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) { 332 Diag(Loc, diag::ext_implicit_lib_function_decl) 333 << Context.BuiltinInfo.GetName(BID) 334 << R; 335 if (Context.BuiltinInfo.getHeaderName(BID) && 336 Diags.getDiagnosticMapping(diag::ext_implicit_lib_function_decl) 337 != diag::MAP_IGNORE) 338 Diag(Loc, diag::note_please_include_header) 339 << Context.BuiltinInfo.getHeaderName(BID) 340 << Context.BuiltinInfo.GetName(BID); 341 } 342 343 FunctionDecl *New = FunctionDecl::Create(Context, 344 Context.getTranslationUnitDecl(), 345 Loc, II, R, 346 FunctionDecl::Extern, false, 347 /*hasPrototype=*/true); 348 New->setImplicit(); 349 350 // Create Decl objects for each parameter, adding them to the 351 // FunctionDecl. 352 if (FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) { 353 llvm::SmallVector<ParmVarDecl*, 16> Params; 354 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) 355 Params.push_back(ParmVarDecl::Create(Context, New, SourceLocation(), 0, 356 FT->getArgType(i), VarDecl::None, 0)); 357 New->setParams(Context, &Params[0], Params.size()); 358 } 359 360 AddKnownFunctionAttributes(New); 361 362 // TUScope is the translation-unit scope to insert this function into. 363 // FIXME: This is hideous. We need to teach PushOnScopeChains to 364 // relate Scopes to DeclContexts, and probably eliminate CurContext 365 // entirely, but we're not there yet. 366 DeclContext *SavedContext = CurContext; 367 CurContext = Context.getTranslationUnitDecl(); 368 PushOnScopeChains(New, TUScope); 369 CurContext = SavedContext; 370 return New; 371} 372 373/// GetStdNamespace - This method gets the C++ "std" namespace. This is where 374/// everything from the standard library is defined. 375NamespaceDecl *Sema::GetStdNamespace() { 376 if (!StdNamespace) { 377 IdentifierInfo *StdIdent = &PP.getIdentifierTable().get("std"); 378 DeclContext *Global = Context.getTranslationUnitDecl(); 379 Decl *Std = LookupQualifiedName(Global, StdIdent, LookupNamespaceName); 380 StdNamespace = dyn_cast_or_null<NamespaceDecl>(Std); 381 } 382 return StdNamespace; 383} 384 385/// MergeTypeDefDecl - We just parsed a typedef 'New' which has the 386/// same name and scope as a previous declaration 'Old'. Figure out 387/// how to resolve this situation, merging decls or emitting 388/// diagnostics as appropriate. Returns true if there was an error, 389/// false otherwise. 390/// 391bool Sema::MergeTypeDefDecl(TypedefDecl *New, Decl *OldD) { 392 bool objc_types = false; 393 // Allow multiple definitions for ObjC built-in typedefs. 394 // FIXME: Verify the underlying types are equivalent! 395 if (getLangOptions().ObjC1) { 396 const IdentifierInfo *TypeID = New->getIdentifier(); 397 switch (TypeID->getLength()) { 398 default: break; 399 case 2: 400 if (!TypeID->isStr("id")) 401 break; 402 Context.setObjCIdType(New); 403 objc_types = true; 404 break; 405 case 5: 406 if (!TypeID->isStr("Class")) 407 break; 408 Context.setObjCClassType(New); 409 objc_types = true; 410 return false; 411 case 3: 412 if (!TypeID->isStr("SEL")) 413 break; 414 Context.setObjCSelType(New); 415 objc_types = true; 416 return false; 417 case 8: 418 if (!TypeID->isStr("Protocol")) 419 break; 420 Context.setObjCProtoType(New->getUnderlyingType()); 421 objc_types = true; 422 return false; 423 } 424 // Fall through - the typedef name was not a builtin type. 425 } 426 // Verify the old decl was also a type. 427 TypeDecl *Old = dyn_cast<TypeDecl>(OldD); 428 if (!Old) { 429 Diag(New->getLocation(), diag::err_redefinition_different_kind) 430 << New->getDeclName(); 431 if (!objc_types) 432 Diag(OldD->getLocation(), diag::note_previous_definition); 433 return true; 434 } 435 436 // Determine the "old" type we'll use for checking and diagnostics. 437 QualType OldType; 438 if (TypedefDecl *OldTypedef = dyn_cast<TypedefDecl>(Old)) 439 OldType = OldTypedef->getUnderlyingType(); 440 else 441 OldType = Context.getTypeDeclType(Old); 442 443 // If the typedef types are not identical, reject them in all languages and 444 // with any extensions enabled. 445 446 if (OldType != New->getUnderlyingType() && 447 Context.getCanonicalType(OldType) != 448 Context.getCanonicalType(New->getUnderlyingType())) { 449 Diag(New->getLocation(), diag::err_redefinition_different_typedef) 450 << New->getUnderlyingType() << OldType; 451 if (!objc_types) 452 Diag(Old->getLocation(), diag::note_previous_definition); 453 return true; 454 } 455 if (objc_types) return false; 456 if (getLangOptions().Microsoft) return false; 457 458 // C++ [dcl.typedef]p2: 459 // In a given non-class scope, a typedef specifier can be used to 460 // redefine the name of any type declared in that scope to refer 461 // to the type to which it already refers. 462 if (getLangOptions().CPlusPlus && !isa<CXXRecordDecl>(CurContext)) 463 return false; 464 465 // In C, redeclaration of a type is a constraint violation (6.7.2.3p1). 466 // Apparently GCC, Intel, and Sun all silently ignore the redeclaration if 467 // *either* declaration is in a system header. The code below implements 468 // this adhoc compatibility rule. FIXME: The following code will not 469 // work properly when compiling ".i" files (containing preprocessed output). 470 if (PP.getDiagnostics().getSuppressSystemWarnings()) { 471 SourceManager &SrcMgr = Context.getSourceManager(); 472 if (SrcMgr.isInSystemHeader(Old->getLocation())) 473 return false; 474 if (SrcMgr.isInSystemHeader(New->getLocation())) 475 return false; 476 } 477 478 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 479 Diag(Old->getLocation(), diag::note_previous_definition); 480 return true; 481} 482 483/// DeclhasAttr - returns true if decl Declaration already has the target 484/// attribute. 485static bool DeclHasAttr(const Decl *decl, const Attr *target) { 486 for (const Attr *attr = decl->getAttrs(); attr; attr = attr->getNext()) 487 if (attr->getKind() == target->getKind()) 488 return true; 489 490 return false; 491} 492 493/// MergeAttributes - append attributes from the Old decl to the New one. 494static void MergeAttributes(Decl *New, Decl *Old, ASTContext &C) { 495 Attr *attr = const_cast<Attr*>(Old->getAttrs()); 496 497 while (attr) { 498 Attr *tmp = attr; 499 attr = attr->getNext(); 500 501 if (!DeclHasAttr(New, tmp) && tmp->isMerged()) { 502 tmp->setInherited(true); 503 New->addAttr(tmp); 504 } else { 505 tmp->setNext(0); 506 tmp->Destroy(C); 507 } 508 } 509 510 Old->invalidateAttrs(); 511} 512 513/// MergeFunctionDecl - We just parsed a function 'New' from 514/// declarator D which has the same name and scope as a previous 515/// declaration 'Old'. Figure out how to resolve this situation, 516/// merging decls or emitting diagnostics as appropriate. 517/// 518/// In C++, New and Old must be declarations that are not 519/// overloaded. Use IsOverload to determine whether New and Old are 520/// overloaded, and to select the Old declaration that New should be 521/// merged with. 522/// 523/// Returns true if there was an error, false otherwise. 524bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD) { 525 assert(!isa<OverloadedFunctionDecl>(OldD) && 526 "Cannot merge with an overloaded function declaration"); 527 528 // Verify the old decl was also a function. 529 FunctionDecl *Old = dyn_cast<FunctionDecl>(OldD); 530 if (!Old) { 531 Diag(New->getLocation(), diag::err_redefinition_different_kind) 532 << New->getDeclName(); 533 Diag(OldD->getLocation(), diag::note_previous_definition); 534 return true; 535 } 536 537 // Determine whether the previous declaration was a definition, 538 // implicit declaration, or a declaration. 539 diag::kind PrevDiag; 540 if (Old->isThisDeclarationADefinition()) 541 PrevDiag = diag::note_previous_definition; 542 else if (Old->isImplicit()) 543 PrevDiag = diag::note_previous_implicit_declaration; 544 else 545 PrevDiag = diag::note_previous_declaration; 546 547 QualType OldQType = Context.getCanonicalType(Old->getType()); 548 QualType NewQType = Context.getCanonicalType(New->getType()); 549 550 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) && 551 New->getStorageClass() == FunctionDecl::Static && 552 Old->getStorageClass() != FunctionDecl::Static) { 553 Diag(New->getLocation(), diag::err_static_non_static) 554 << New; 555 Diag(Old->getLocation(), PrevDiag); 556 return true; 557 } 558 559 if (getLangOptions().CPlusPlus) { 560 // (C++98 13.1p2): 561 // Certain function declarations cannot be overloaded: 562 // -- Function declarations that differ only in the return type 563 // cannot be overloaded. 564 QualType OldReturnType 565 = cast<FunctionType>(OldQType.getTypePtr())->getResultType(); 566 QualType NewReturnType 567 = cast<FunctionType>(NewQType.getTypePtr())->getResultType(); 568 if (OldReturnType != NewReturnType) { 569 Diag(New->getLocation(), diag::err_ovl_diff_return_type); 570 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 571 return true; 572 } 573 574 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 575 const CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 576 if (OldMethod && NewMethod) { 577 // -- Member function declarations with the same name and the 578 // same parameter types cannot be overloaded if any of them 579 // is a static member function declaration. 580 if (OldMethod->isStatic() || NewMethod->isStatic()) { 581 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 582 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 583 return true; 584 } 585 586 // C++ [class.mem]p1: 587 // [...] A member shall not be declared twice in the 588 // member-specification, except that a nested class or member 589 // class template can be declared and then later defined. 590 if (OldMethod->getLexicalDeclContext() == 591 NewMethod->getLexicalDeclContext()) { 592 unsigned NewDiag; 593 if (isa<CXXConstructorDecl>(OldMethod)) 594 NewDiag = diag::err_constructor_redeclared; 595 else if (isa<CXXDestructorDecl>(NewMethod)) 596 NewDiag = diag::err_destructor_redeclared; 597 else if (isa<CXXConversionDecl>(NewMethod)) 598 NewDiag = diag::err_conv_function_redeclared; 599 else 600 NewDiag = diag::err_member_redeclared; 601 602 Diag(New->getLocation(), NewDiag); 603 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 604 } 605 } 606 607 // (C++98 8.3.5p3): 608 // All declarations for a function shall agree exactly in both the 609 // return type and the parameter-type-list. 610 if (OldQType == NewQType) 611 return MergeCompatibleFunctionDecls(New, Old); 612 613 // Fall through for conflicting redeclarations and redefinitions. 614 } 615 616 // C: Function types need to be compatible, not identical. This handles 617 // duplicate function decls like "void f(int); void f(enum X);" properly. 618 if (!getLangOptions().CPlusPlus && 619 Context.typesAreCompatible(OldQType, NewQType)) { 620 const FunctionType *NewFuncType = NewQType->getAsFunctionType(); 621 const FunctionProtoType *OldProto = 0; 622 if (isa<FunctionNoProtoType>(NewFuncType) && 623 (OldProto = OldQType->getAsFunctionProtoType())) { 624 // The old declaration provided a function prototype, but the 625 // new declaration does not. Merge in the prototype. 626 llvm::SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(), 627 OldProto->arg_type_end()); 628 NewQType = Context.getFunctionType(NewFuncType->getResultType(), 629 &ParamTypes[0], ParamTypes.size(), 630 OldProto->isVariadic(), 631 OldProto->getTypeQuals()); 632 New->setType(NewQType); 633 New->setInheritedPrototype(); 634 635 // Synthesize a parameter for each argument type. 636 llvm::SmallVector<ParmVarDecl*, 16> Params; 637 for (FunctionProtoType::arg_type_iterator 638 ParamType = OldProto->arg_type_begin(), 639 ParamEnd = OldProto->arg_type_end(); 640 ParamType != ParamEnd; ++ParamType) { 641 ParmVarDecl *Param = ParmVarDecl::Create(Context, New, 642 SourceLocation(), 0, 643 *ParamType, VarDecl::None, 644 0); 645 Param->setImplicit(); 646 Params.push_back(Param); 647 } 648 649 New->setParams(Context, &Params[0], Params.size()); 650 651 } 652 653 return MergeCompatibleFunctionDecls(New, Old); 654 } 655 656 // A function that has already been declared has been redeclared or defined 657 // with a different type- show appropriate diagnostic 658 if (unsigned BuiltinID = Old->getBuiltinID(Context)) { 659 // The user has declared a builtin function with an incompatible 660 // signature. 661 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 662 // The function the user is redeclaring is a library-defined 663 // function like 'malloc' or 'printf'. Warn about the 664 // redeclaration, then ignore it. 665 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; 666 Diag(Old->getLocation(), diag::note_previous_builtin_declaration) 667 << Old << Old->getType(); 668 return true; 669 } 670 671 PrevDiag = diag::note_previous_builtin_declaration; 672 } 673 674 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 675 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 676 return true; 677} 678 679/// \brief Completes the merge of two function declarations that are 680/// known to be compatible. 681/// 682/// This routine handles the merging of attributes and other 683/// properties of function declarations form the old declaration to 684/// the new declaration, once we know that New is in fact a 685/// redeclaration of Old. 686/// 687/// \returns false 688bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old) { 689 // Merge the attributes 690 MergeAttributes(New, Old, Context); 691 692 // Merge the storage class. 693 New->setStorageClass(Old->getStorageClass()); 694 695 // FIXME: need to implement inline semantics 696 697 // Merge "pure" flag. 698 if (Old->isPure()) 699 New->setPure(); 700 701 // Merge the "deleted" flag. 702 if (Old->isDeleted()) 703 New->setDeleted(); 704 705 if (getLangOptions().CPlusPlus) 706 return MergeCXXFunctionDecl(New, Old); 707 708 return false; 709} 710 711/// Predicate for C "tentative" external object definitions (C99 6.9.2). 712static bool isTentativeDefinition(VarDecl *VD) { 713 if (VD->isFileVarDecl()) 714 return (!VD->getInit() && 715 (VD->getStorageClass() == VarDecl::None || 716 VD->getStorageClass() == VarDecl::Static)); 717 return false; 718} 719 720/// CheckForFileScopedRedefinitions - Make sure we forgo redefinition errors 721/// when dealing with C "tentative" external object definitions (C99 6.9.2). 722void Sema::CheckForFileScopedRedefinitions(Scope *S, VarDecl *VD) { 723 bool VDIsTentative = isTentativeDefinition(VD); 724 bool VDIsIncompleteArray = VD->getType()->isIncompleteArrayType(); 725 726 // FIXME: I don't think this will actually see all of the 727 // redefinitions. Can't we check this property on-the-fly? 728 for (IdentifierResolver::iterator I = IdResolver.begin(VD->getIdentifier()), 729 E = IdResolver.end(); 730 I != E; ++I) { 731 if (*I != VD && isDeclInScope(*I, VD->getDeclContext(), S)) { 732 VarDecl *OldDecl = dyn_cast<VarDecl>(*I); 733 734 // Handle the following case: 735 // int a[10]; 736 // int a[]; - the code below makes sure we set the correct type. 737 // int a[11]; - this is an error, size isn't 10. 738 if (OldDecl && VDIsTentative && VDIsIncompleteArray && 739 OldDecl->getType()->isConstantArrayType()) 740 VD->setType(OldDecl->getType()); 741 742 // Check for "tentative" definitions. We can't accomplish this in 743 // MergeVarDecl since the initializer hasn't been attached. 744 if (!OldDecl || isTentativeDefinition(OldDecl) || VDIsTentative) 745 continue; 746 747 // Handle __private_extern__ just like extern. 748 if (OldDecl->getStorageClass() != VarDecl::Extern && 749 OldDecl->getStorageClass() != VarDecl::PrivateExtern && 750 VD->getStorageClass() != VarDecl::Extern && 751 VD->getStorageClass() != VarDecl::PrivateExtern) { 752 Diag(VD->getLocation(), diag::err_redefinition) << VD->getDeclName(); 753 Diag(OldDecl->getLocation(), diag::note_previous_definition); 754 // One redefinition error is enough. 755 break; 756 } 757 } 758 } 759} 760 761/// MergeVarDecl - We just parsed a variable 'New' which has the same name 762/// and scope as a previous declaration 'Old'. Figure out how to resolve this 763/// situation, merging decls or emitting diagnostics as appropriate. 764/// 765/// Tentative definition rules (C99 6.9.2p2) are checked by 766/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 767/// definitions here, since the initializer hasn't been attached. 768/// 769bool Sema::MergeVarDecl(VarDecl *New, Decl *OldD) { 770 // Verify the old decl was also a variable. 771 VarDecl *Old = dyn_cast<VarDecl>(OldD); 772 if (!Old) { 773 Diag(New->getLocation(), diag::err_redefinition_different_kind) 774 << New->getDeclName(); 775 Diag(OldD->getLocation(), diag::note_previous_definition); 776 return true; 777 } 778 779 MergeAttributes(New, Old, Context); 780 781 // Merge the types 782 QualType MergedT = Context.mergeTypes(New->getType(), Old->getType()); 783 if (MergedT.isNull()) { 784 Diag(New->getLocation(), diag::err_redefinition_different_type) 785 << New->getDeclName(); 786 Diag(Old->getLocation(), diag::note_previous_definition); 787 return true; 788 } 789 New->setType(MergedT); 790 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 791 if (New->getStorageClass() == VarDecl::Static && 792 (Old->getStorageClass() == VarDecl::None || 793 Old->getStorageClass() == VarDecl::Extern)) { 794 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 795 Diag(Old->getLocation(), diag::note_previous_definition); 796 return true; 797 } 798 // C99 6.2.2p4: Check if we have a non-static decl followed by a static. 799 if (New->getStorageClass() != VarDecl::Static && 800 Old->getStorageClass() == VarDecl::Static) { 801 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 802 Diag(Old->getLocation(), diag::note_previous_definition); 803 return true; 804 } 805 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 806 if (New->getStorageClass() != VarDecl::Extern && !New->isFileVarDecl()) { 807 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 808 Diag(Old->getLocation(), diag::note_previous_definition); 809 return true; 810 } 811 return false; 812} 813 814/// CheckParmsForFunctionDef - Check that the parameters of the given 815/// function are appropriate for the definition of a function. This 816/// takes care of any checks that cannot be performed on the 817/// declaration itself, e.g., that the types of each of the function 818/// parameters are complete. 819bool Sema::CheckParmsForFunctionDef(FunctionDecl *FD) { 820 bool HasInvalidParm = false; 821 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 822 ParmVarDecl *Param = FD->getParamDecl(p); 823 824 // C99 6.7.5.3p4: the parameters in a parameter type list in a 825 // function declarator that is part of a function definition of 826 // that function shall not have incomplete type. 827 if (!Param->isInvalidDecl() && 828 DiagnoseIncompleteType(Param->getLocation(), Param->getType(), 829 diag::err_typecheck_decl_incomplete_type)) { 830 Param->setInvalidDecl(); 831 HasInvalidParm = true; 832 } 833 834 // C99 6.9.1p5: If the declarator includes a parameter type list, the 835 // declaration of each parameter shall include an identifier. 836 if (Param->getIdentifier() == 0 && 837 !Param->isImplicit() && 838 !getLangOptions().CPlusPlus) 839 Diag(Param->getLocation(), diag::err_parameter_name_omitted); 840 } 841 842 return HasInvalidParm; 843} 844 845/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 846/// no declarator (e.g. "struct foo;") is parsed. 847Sema::DeclTy *Sema::ParsedFreeStandingDeclSpec(Scope *S, DeclSpec &DS) { 848 TagDecl *Tag = 0; 849 if (DS.getTypeSpecType() == DeclSpec::TST_class || 850 DS.getTypeSpecType() == DeclSpec::TST_struct || 851 DS.getTypeSpecType() == DeclSpec::TST_union || 852 DS.getTypeSpecType() == DeclSpec::TST_enum) 853 Tag = dyn_cast<TagDecl>(static_cast<Decl *>(DS.getTypeRep())); 854 855 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 856 if (!Record->getDeclName() && Record->isDefinition() && 857 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) 858 return BuildAnonymousStructOrUnion(S, DS, Record); 859 860 // Microsoft allows unnamed struct/union fields. Don't complain 861 // about them. 862 // FIXME: Should we support Microsoft's extensions in this area? 863 if (Record->getDeclName() && getLangOptions().Microsoft) 864 return Tag; 865 } 866 867 if (!DS.isMissingDeclaratorOk() && 868 DS.getTypeSpecType() != DeclSpec::TST_error) { 869 // Warn about typedefs of enums without names, since this is an 870 // extension in both Microsoft an GNU. 871 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 872 Tag && isa<EnumDecl>(Tag)) { 873 Diag(DS.getSourceRange().getBegin(), diag::ext_typedef_without_a_name) 874 << DS.getSourceRange(); 875 return Tag; 876 } 877 878 Diag(DS.getSourceRange().getBegin(), diag::err_no_declarators) 879 << DS.getSourceRange(); 880 return 0; 881 } 882 883 return Tag; 884} 885 886/// InjectAnonymousStructOrUnionMembers - Inject the members of the 887/// anonymous struct or union AnonRecord into the owning context Owner 888/// and scope S. This routine will be invoked just after we realize 889/// that an unnamed union or struct is actually an anonymous union or 890/// struct, e.g., 891/// 892/// @code 893/// union { 894/// int i; 895/// float f; 896/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 897/// // f into the surrounding scope.x 898/// @endcode 899/// 900/// This routine is recursive, injecting the names of nested anonymous 901/// structs/unions into the owning context and scope as well. 902bool Sema::InjectAnonymousStructOrUnionMembers(Scope *S, DeclContext *Owner, 903 RecordDecl *AnonRecord) { 904 bool Invalid = false; 905 for (RecordDecl::field_iterator F = AnonRecord->field_begin(), 906 FEnd = AnonRecord->field_end(); 907 F != FEnd; ++F) { 908 if ((*F)->getDeclName()) { 909 NamedDecl *PrevDecl = LookupQualifiedName(Owner, (*F)->getDeclName(), 910 LookupOrdinaryName, true); 911 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 912 // C++ [class.union]p2: 913 // The names of the members of an anonymous union shall be 914 // distinct from the names of any other entity in the 915 // scope in which the anonymous union is declared. 916 unsigned diagKind 917 = AnonRecord->isUnion()? diag::err_anonymous_union_member_redecl 918 : diag::err_anonymous_struct_member_redecl; 919 Diag((*F)->getLocation(), diagKind) 920 << (*F)->getDeclName(); 921 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 922 Invalid = true; 923 } else { 924 // C++ [class.union]p2: 925 // For the purpose of name lookup, after the anonymous union 926 // definition, the members of the anonymous union are 927 // considered to have been defined in the scope in which the 928 // anonymous union is declared. 929 Owner->makeDeclVisibleInContext(*F); 930 S->AddDecl(*F); 931 IdResolver.AddDecl(*F); 932 } 933 } else if (const RecordType *InnerRecordType 934 = (*F)->getType()->getAsRecordType()) { 935 RecordDecl *InnerRecord = InnerRecordType->getDecl(); 936 if (InnerRecord->isAnonymousStructOrUnion()) 937 Invalid = Invalid || 938 InjectAnonymousStructOrUnionMembers(S, Owner, InnerRecord); 939 } 940 } 941 942 return Invalid; 943} 944 945/// ActOnAnonymousStructOrUnion - Handle the declaration of an 946/// anonymous structure or union. Anonymous unions are a C++ feature 947/// (C++ [class.union]) and a GNU C extension; anonymous structures 948/// are a GNU C and GNU C++ extension. 949Sema::DeclTy *Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 950 RecordDecl *Record) { 951 DeclContext *Owner = Record->getDeclContext(); 952 953 // Diagnose whether this anonymous struct/union is an extension. 954 if (Record->isUnion() && !getLangOptions().CPlusPlus) 955 Diag(Record->getLocation(), diag::ext_anonymous_union); 956 else if (!Record->isUnion()) 957 Diag(Record->getLocation(), diag::ext_anonymous_struct); 958 959 // C and C++ require different kinds of checks for anonymous 960 // structs/unions. 961 bool Invalid = false; 962 if (getLangOptions().CPlusPlus) { 963 const char* PrevSpec = 0; 964 // C++ [class.union]p3: 965 // Anonymous unions declared in a named namespace or in the 966 // global namespace shall be declared static. 967 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 968 (isa<TranslationUnitDecl>(Owner) || 969 (isa<NamespaceDecl>(Owner) && 970 cast<NamespaceDecl>(Owner)->getDeclName()))) { 971 Diag(Record->getLocation(), diag::err_anonymous_union_not_static); 972 Invalid = true; 973 974 // Recover by adding 'static'. 975 DS.SetStorageClassSpec(DeclSpec::SCS_static, SourceLocation(), PrevSpec); 976 } 977 // C++ [class.union]p3: 978 // A storage class is not allowed in a declaration of an 979 // anonymous union in a class scope. 980 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 981 isa<RecordDecl>(Owner)) { 982 Diag(DS.getStorageClassSpecLoc(), 983 diag::err_anonymous_union_with_storage_spec); 984 Invalid = true; 985 986 // Recover by removing the storage specifier. 987 DS.SetStorageClassSpec(DeclSpec::SCS_unspecified, SourceLocation(), 988 PrevSpec); 989 } 990 991 // C++ [class.union]p2: 992 // The member-specification of an anonymous union shall only 993 // define non-static data members. [Note: nested types and 994 // functions cannot be declared within an anonymous union. ] 995 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 996 MemEnd = Record->decls_end(); 997 Mem != MemEnd; ++Mem) { 998 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 999 // C++ [class.union]p3: 1000 // An anonymous union shall not have private or protected 1001 // members (clause 11). 1002 if (FD->getAccess() == AS_protected || FD->getAccess() == AS_private) { 1003 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 1004 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 1005 Invalid = true; 1006 } 1007 } else if ((*Mem)->isImplicit()) { 1008 // Any implicit members are fine. 1009 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 1010 // This is a type that showed up in an 1011 // elaborated-type-specifier inside the anonymous struct or 1012 // union, but which actually declares a type outside of the 1013 // anonymous struct or union. It's okay. 1014 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 1015 if (!MemRecord->isAnonymousStructOrUnion() && 1016 MemRecord->getDeclName()) { 1017 // This is a nested type declaration. 1018 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 1019 << (int)Record->isUnion(); 1020 Invalid = true; 1021 } 1022 } else { 1023 // We have something that isn't a non-static data 1024 // member. Complain about it. 1025 unsigned DK = diag::err_anonymous_record_bad_member; 1026 if (isa<TypeDecl>(*Mem)) 1027 DK = diag::err_anonymous_record_with_type; 1028 else if (isa<FunctionDecl>(*Mem)) 1029 DK = diag::err_anonymous_record_with_function; 1030 else if (isa<VarDecl>(*Mem)) 1031 DK = diag::err_anonymous_record_with_static; 1032 Diag((*Mem)->getLocation(), DK) 1033 << (int)Record->isUnion(); 1034 Invalid = true; 1035 } 1036 } 1037 } else { 1038 // FIXME: Check GNU C semantics 1039 if (Record->isUnion() && !Owner->isRecord()) { 1040 Diag(Record->getLocation(), diag::err_anonymous_union_not_member) 1041 << (int)getLangOptions().CPlusPlus; 1042 Invalid = true; 1043 } 1044 } 1045 1046 if (!Record->isUnion() && !Owner->isRecord()) { 1047 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 1048 << (int)getLangOptions().CPlusPlus; 1049 Invalid = true; 1050 } 1051 1052 // Create a declaration for this anonymous struct/union. 1053 NamedDecl *Anon = 0; 1054 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 1055 Anon = FieldDecl::Create(Context, OwningClass, Record->getLocation(), 1056 /*IdentifierInfo=*/0, 1057 Context.getTypeDeclType(Record), 1058 /*BitWidth=*/0, /*Mutable=*/false); 1059 Anon->setAccess(AS_public); 1060 if (getLangOptions().CPlusPlus) 1061 FieldCollector->Add(cast<FieldDecl>(Anon)); 1062 } else { 1063 VarDecl::StorageClass SC; 1064 switch (DS.getStorageClassSpec()) { 1065 default: assert(0 && "Unknown storage class!"); 1066 case DeclSpec::SCS_unspecified: SC = VarDecl::None; break; 1067 case DeclSpec::SCS_extern: SC = VarDecl::Extern; break; 1068 case DeclSpec::SCS_static: SC = VarDecl::Static; break; 1069 case DeclSpec::SCS_auto: SC = VarDecl::Auto; break; 1070 case DeclSpec::SCS_register: SC = VarDecl::Register; break; 1071 case DeclSpec::SCS_private_extern: SC = VarDecl::PrivateExtern; break; 1072 case DeclSpec::SCS_mutable: 1073 // mutable can only appear on non-static class members, so it's always 1074 // an error here 1075 Diag(Record->getLocation(), diag::err_mutable_nonmember); 1076 Invalid = true; 1077 SC = VarDecl::None; 1078 break; 1079 } 1080 1081 Anon = VarDecl::Create(Context, Owner, Record->getLocation(), 1082 /*IdentifierInfo=*/0, 1083 Context.getTypeDeclType(Record), 1084 SC, DS.getSourceRange().getBegin()); 1085 } 1086 Anon->setImplicit(); 1087 1088 // Add the anonymous struct/union object to the current 1089 // context. We'll be referencing this object when we refer to one of 1090 // its members. 1091 Owner->addDecl(Anon); 1092 1093 // Inject the members of the anonymous struct/union into the owning 1094 // context and into the identifier resolver chain for name lookup 1095 // purposes. 1096 if (InjectAnonymousStructOrUnionMembers(S, Owner, Record)) 1097 Invalid = true; 1098 1099 // Mark this as an anonymous struct/union type. Note that we do not 1100 // do this until after we have already checked and injected the 1101 // members of this anonymous struct/union type, because otherwise 1102 // the members could be injected twice: once by DeclContext when it 1103 // builds its lookup table, and once by 1104 // InjectAnonymousStructOrUnionMembers. 1105 Record->setAnonymousStructOrUnion(true); 1106 1107 if (Invalid) 1108 Anon->setInvalidDecl(); 1109 1110 return Anon; 1111} 1112 1113 1114/// GetNameForDeclarator - Determine the full declaration name for the 1115/// given Declarator. 1116DeclarationName Sema::GetNameForDeclarator(Declarator &D) { 1117 switch (D.getKind()) { 1118 case Declarator::DK_Abstract: 1119 assert(D.getIdentifier() == 0 && "abstract declarators have no name"); 1120 return DeclarationName(); 1121 1122 case Declarator::DK_Normal: 1123 assert (D.getIdentifier() != 0 && "normal declarators have an identifier"); 1124 return DeclarationName(D.getIdentifier()); 1125 1126 case Declarator::DK_Constructor: { 1127 QualType Ty = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1128 Ty = Context.getCanonicalType(Ty); 1129 return Context.DeclarationNames.getCXXConstructorName(Ty); 1130 } 1131 1132 case Declarator::DK_Destructor: { 1133 QualType Ty = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1134 Ty = Context.getCanonicalType(Ty); 1135 return Context.DeclarationNames.getCXXDestructorName(Ty); 1136 } 1137 1138 case Declarator::DK_Conversion: { 1139 // FIXME: We'd like to keep the non-canonical type for diagnostics! 1140 QualType Ty = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1141 Ty = Context.getCanonicalType(Ty); 1142 return Context.DeclarationNames.getCXXConversionFunctionName(Ty); 1143 } 1144 1145 case Declarator::DK_Operator: 1146 assert(D.getIdentifier() == 0 && "operator names have no identifier"); 1147 return Context.DeclarationNames.getCXXOperatorName( 1148 D.getOverloadedOperator()); 1149 } 1150 1151 assert(false && "Unknown name kind"); 1152 return DeclarationName(); 1153} 1154 1155/// isNearlyMatchingFunction - Determine whether the C++ functions 1156/// Declaration and Definition are "nearly" matching. This heuristic 1157/// is used to improve diagnostics in the case where an out-of-line 1158/// function definition doesn't match any declaration within 1159/// the class or namespace. 1160static bool isNearlyMatchingFunction(ASTContext &Context, 1161 FunctionDecl *Declaration, 1162 FunctionDecl *Definition) { 1163 if (Declaration->param_size() != Definition->param_size()) 1164 return false; 1165 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 1166 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 1167 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 1168 1169 DeclParamTy = Context.getCanonicalType(DeclParamTy.getNonReferenceType()); 1170 DefParamTy = Context.getCanonicalType(DefParamTy.getNonReferenceType()); 1171 if (DeclParamTy.getUnqualifiedType() != DefParamTy.getUnqualifiedType()) 1172 return false; 1173 } 1174 1175 return true; 1176} 1177 1178Sema::DeclTy * 1179Sema::ActOnDeclarator(Scope *S, Declarator &D, DeclTy *lastDecl, 1180 bool IsFunctionDefinition) { 1181 NamedDecl *LastDeclarator = dyn_cast_or_null<NamedDecl>((Decl *)lastDecl); 1182 DeclarationName Name = GetNameForDeclarator(D); 1183 1184 // All of these full declarators require an identifier. If it doesn't have 1185 // one, the ParsedFreeStandingDeclSpec action should be used. 1186 if (!Name) { 1187 if (!D.getInvalidType()) // Reject this if we think it is valid. 1188 Diag(D.getDeclSpec().getSourceRange().getBegin(), 1189 diag::err_declarator_need_ident) 1190 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 1191 return 0; 1192 } 1193 1194 // The scope passed in may not be a decl scope. Zip up the scope tree until 1195 // we find one that is. 1196 while ((S->getFlags() & Scope::DeclScope) == 0 || 1197 (S->getFlags() & Scope::TemplateParamScope) != 0) 1198 S = S->getParent(); 1199 1200 DeclContext *DC; 1201 NamedDecl *PrevDecl; 1202 NamedDecl *New; 1203 bool InvalidDecl = false; 1204 1205 QualType R = GetTypeForDeclarator(D, S); 1206 if (R.isNull()) { 1207 InvalidDecl = true; 1208 R = Context.IntTy; 1209 } 1210 1211 // See if this is a redefinition of a variable in the same scope. 1212 if (!D.getCXXScopeSpec().isSet() && !D.getCXXScopeSpec().isInvalid()) { 1213 LookupNameKind NameKind = LookupOrdinaryName; 1214 1215 // If the declaration we're planning to build will be a function 1216 // or object with linkage, then look for another declaration with 1217 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 1218 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 1219 /* Do nothing*/; 1220 else if (R->isFunctionType()) { 1221 if (CurContext->isFunctionOrMethod()) 1222 NameKind = LookupRedeclarationWithLinkage; 1223 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 1224 NameKind = LookupRedeclarationWithLinkage; 1225 1226 DC = CurContext; 1227 PrevDecl = LookupName(S, Name, NameKind, true, 1228 D.getDeclSpec().getStorageClassSpec() != 1229 DeclSpec::SCS_static, 1230 D.getIdentifierLoc()); 1231 } else { // Something like "int foo::x;" 1232 DC = static_cast<DeclContext*>(D.getCXXScopeSpec().getScopeRep()); 1233 PrevDecl = LookupQualifiedName(DC, Name, LookupOrdinaryName, true); 1234 1235 // C++ 7.3.1.2p2: 1236 // Members (including explicit specializations of templates) of a named 1237 // namespace can also be defined outside that namespace by explicit 1238 // qualification of the name being defined, provided that the entity being 1239 // defined was already declared in the namespace and the definition appears 1240 // after the point of declaration in a namespace that encloses the 1241 // declarations namespace. 1242 // 1243 // Note that we only check the context at this point. We don't yet 1244 // have enough information to make sure that PrevDecl is actually 1245 // the declaration we want to match. For example, given: 1246 // 1247 // class X { 1248 // void f(); 1249 // void f(float); 1250 // }; 1251 // 1252 // void X::f(int) { } // ill-formed 1253 // 1254 // In this case, PrevDecl will point to the overload set 1255 // containing the two f's declared in X, but neither of them 1256 // matches. 1257 1258 // First check whether we named the global scope. 1259 if (isa<TranslationUnitDecl>(DC)) { 1260 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 1261 << Name << D.getCXXScopeSpec().getRange(); 1262 } else if (!CurContext->Encloses(DC)) { 1263 // The qualifying scope doesn't enclose the original declaration. 1264 // Emit diagnostic based on current scope. 1265 SourceLocation L = D.getIdentifierLoc(); 1266 SourceRange R = D.getCXXScopeSpec().getRange(); 1267 if (isa<FunctionDecl>(CurContext)) 1268 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 1269 else 1270 Diag(L, diag::err_invalid_declarator_scope) 1271 << Name << cast<NamedDecl>(DC) << R; 1272 InvalidDecl = true; 1273 } 1274 } 1275 1276 if (PrevDecl && PrevDecl->isTemplateParameter()) { 1277 // Maybe we will complain about the shadowed template parameter. 1278 InvalidDecl = InvalidDecl 1279 || DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 1280 // Just pretend that we didn't see the previous declaration. 1281 PrevDecl = 0; 1282 } 1283 1284 // In C++, the previous declaration we find might be a tag type 1285 // (class or enum). In this case, the new declaration will hide the 1286 // tag type. Note that this does does not apply if we're declaring a 1287 // typedef (C++ [dcl.typedef]p4). 1288 if (PrevDecl && PrevDecl->getIdentifierNamespace() == Decl::IDNS_Tag && 1289 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 1290 PrevDecl = 0; 1291 1292 bool Redeclaration = false; 1293 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 1294 New = ActOnTypedefDeclarator(S, D, DC, R, LastDeclarator, PrevDecl, 1295 InvalidDecl, Redeclaration); 1296 } else if (R->isFunctionType()) { 1297 New = ActOnFunctionDeclarator(S, D, DC, R, LastDeclarator, PrevDecl, 1298 IsFunctionDefinition, InvalidDecl, 1299 Redeclaration); 1300 } else { 1301 New = ActOnVariableDeclarator(S, D, DC, R, LastDeclarator, PrevDecl, 1302 InvalidDecl, Redeclaration); 1303 } 1304 1305 if (New == 0) 1306 return 0; 1307 1308 // Set the lexical context. If the declarator has a C++ scope specifier, the 1309 // lexical context will be different from the semantic context. 1310 New->setLexicalDeclContext(CurContext); 1311 1312 // If this has an identifier and is not an invalid redeclaration, 1313 // add it to the scope stack. 1314 if (Name && !(Redeclaration && InvalidDecl)) 1315 PushOnScopeChains(New, S); 1316 // If any semantic error occurred, mark the decl as invalid. 1317 if (D.getInvalidType() || InvalidDecl) 1318 New->setInvalidDecl(); 1319 1320 return New; 1321} 1322 1323/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 1324/// types into constant array types in certain situations which would otherwise 1325/// be errors (for GCC compatibility). 1326static QualType TryToFixInvalidVariablyModifiedType(QualType T, 1327 ASTContext &Context, 1328 bool &SizeIsNegative) { 1329 // This method tries to turn a variable array into a constant 1330 // array even when the size isn't an ICE. This is necessary 1331 // for compatibility with code that depends on gcc's buggy 1332 // constant expression folding, like struct {char x[(int)(char*)2];} 1333 SizeIsNegative = false; 1334 1335 if (const PointerType* PTy = dyn_cast<PointerType>(T)) { 1336 QualType Pointee = PTy->getPointeeType(); 1337 QualType FixedType = 1338 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative); 1339 if (FixedType.isNull()) return FixedType; 1340 FixedType = Context.getPointerType(FixedType); 1341 FixedType.setCVRQualifiers(T.getCVRQualifiers()); 1342 return FixedType; 1343 } 1344 1345 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 1346 if (!VLATy) 1347 return QualType(); 1348 // FIXME: We should probably handle this case 1349 if (VLATy->getElementType()->isVariablyModifiedType()) 1350 return QualType(); 1351 1352 Expr::EvalResult EvalResult; 1353 if (!VLATy->getSizeExpr() || 1354 !VLATy->getSizeExpr()->Evaluate(EvalResult, Context) || 1355 !EvalResult.Val.isInt()) 1356 return QualType(); 1357 1358 llvm::APSInt &Res = EvalResult.Val.getInt(); 1359 if (Res >= llvm::APSInt(Res.getBitWidth(), Res.isUnsigned())) 1360 return Context.getConstantArrayType(VLATy->getElementType(), 1361 Res, ArrayType::Normal, 0); 1362 1363 SizeIsNegative = true; 1364 return QualType(); 1365} 1366 1367/// \brief Register the given locally-scoped external C declaration so 1368/// that it can be found later for redeclarations 1369void 1370Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, NamedDecl *PrevDecl, 1371 Scope *S) { 1372 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 1373 "Decl is not a locally-scoped decl!"); 1374 // Note that we have a locally-scoped external with this name. 1375 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 1376 1377 if (!PrevDecl) 1378 return; 1379 1380 // If there was a previous declaration of this variable, it may be 1381 // in our identifier chain. Update the identifier chain with the new 1382 // declaration. 1383 if (IdResolver.ReplaceDecl(PrevDecl, ND)) { 1384 // The previous declaration was found on the identifer resolver 1385 // chain, so remove it from its scope. 1386 while (S && !S->isDeclScope(PrevDecl)) 1387 S = S->getParent(); 1388 1389 if (S) 1390 S->RemoveDecl(PrevDecl); 1391 } 1392} 1393 1394NamedDecl* 1395Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 1396 QualType R, Decl* LastDeclarator, 1397 Decl* PrevDecl, bool& InvalidDecl, 1398 bool &Redeclaration) { 1399 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 1400 if (D.getCXXScopeSpec().isSet()) { 1401 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 1402 << D.getCXXScopeSpec().getRange(); 1403 InvalidDecl = true; 1404 // Pretend we didn't see the scope specifier. 1405 DC = 0; 1406 } 1407 1408 // Check that there are no default arguments (C++ only). 1409 if (getLangOptions().CPlusPlus) 1410 CheckExtraCXXDefaultArguments(D); 1411 1412 TypedefDecl *NewTD = ParseTypedefDecl(S, D, R, LastDeclarator); 1413 if (!NewTD) return 0; 1414 1415 // Handle attributes prior to checking for duplicates in MergeVarDecl 1416 ProcessDeclAttributes(NewTD, D); 1417 // Merge the decl with the existing one if appropriate. If the decl is 1418 // in an outer scope, it isn't the same thing. 1419 if (PrevDecl && isDeclInScope(PrevDecl, DC, S)) { 1420 Redeclaration = true; 1421 if (MergeTypeDefDecl(NewTD, PrevDecl)) 1422 InvalidDecl = true; 1423 } 1424 1425 if (S->getFnParent() == 0) { 1426 QualType T = NewTD->getUnderlyingType(); 1427 // C99 6.7.7p2: If a typedef name specifies a variably modified type 1428 // then it shall have block scope. 1429 if (T->isVariablyModifiedType()) { 1430 bool SizeIsNegative; 1431 QualType FixedTy = 1432 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative); 1433 if (!FixedTy.isNull()) { 1434 Diag(D.getIdentifierLoc(), diag::warn_illegal_constant_array_size); 1435 NewTD->setUnderlyingType(FixedTy); 1436 } else { 1437 if (SizeIsNegative) 1438 Diag(D.getIdentifierLoc(), diag::err_typecheck_negative_array_size); 1439 else if (T->isVariableArrayType()) 1440 Diag(D.getIdentifierLoc(), diag::err_vla_decl_in_file_scope); 1441 else 1442 Diag(D.getIdentifierLoc(), diag::err_vm_decl_in_file_scope); 1443 InvalidDecl = true; 1444 } 1445 } 1446 } 1447 return NewTD; 1448} 1449 1450/// \brief Determines whether the given declaration is an out-of-scope 1451/// previous declaration. 1452/// 1453/// This routine should be invoked when name lookup has found a 1454/// previous declaration (PrevDecl) that is not in the scope where a 1455/// new declaration by the same name is being introduced. If the new 1456/// declaration occurs in a local scope, previous declarations with 1457/// linkage may still be considered previous declarations (C99 1458/// 6.2.2p4-5, C++ [basic.link]p6). 1459/// 1460/// \param PrevDecl the previous declaration found by name 1461/// lookup 1462/// 1463/// \param DC the context in which the new declaration is being 1464/// declared. 1465/// 1466/// \returns true if PrevDecl is an out-of-scope previous declaration 1467/// for a new delcaration with the same name. 1468static bool 1469isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 1470 ASTContext &Context) { 1471 if (!PrevDecl) 1472 return 0; 1473 1474 // FIXME: PrevDecl could be an OverloadedFunctionDecl, in which 1475 // case we need to check each of the overloaded functions. 1476 if (!PrevDecl->hasLinkage()) 1477 return false; 1478 1479 if (Context.getLangOptions().CPlusPlus) { 1480 // C++ [basic.link]p6: 1481 // If there is a visible declaration of an entity with linkage 1482 // having the same name and type, ignoring entities declared 1483 // outside the innermost enclosing namespace scope, the block 1484 // scope declaration declares that same entity and receives the 1485 // linkage of the previous declaration. 1486 DeclContext *OuterContext = DC->getLookupContext(); 1487 if (!OuterContext->isFunctionOrMethod()) 1488 // This rule only applies to block-scope declarations. 1489 return false; 1490 else { 1491 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 1492 if (PrevOuterContext->isRecord()) 1493 // We found a member function: ignore it. 1494 return false; 1495 else { 1496 // Find the innermost enclosing namespace for the new and 1497 // previous declarations. 1498 while (!OuterContext->isFileContext()) 1499 OuterContext = OuterContext->getParent(); 1500 while (!PrevOuterContext->isFileContext()) 1501 PrevOuterContext = PrevOuterContext->getParent(); 1502 1503 // The previous declaration is in a different namespace, so it 1504 // isn't the same function. 1505 if (OuterContext->getPrimaryContext() != 1506 PrevOuterContext->getPrimaryContext()) 1507 return false; 1508 } 1509 } 1510 } 1511 1512 return true; 1513} 1514 1515NamedDecl* 1516Sema::ActOnVariableDeclarator(Scope* S, Declarator& D, DeclContext* DC, 1517 QualType R, Decl* LastDeclarator, 1518 NamedDecl* PrevDecl, bool& InvalidDecl, 1519 bool &Redeclaration) { 1520 DeclarationName Name = GetNameForDeclarator(D); 1521 1522 // Check that there are no default arguments (C++ only). 1523 if (getLangOptions().CPlusPlus) 1524 CheckExtraCXXDefaultArguments(D); 1525 1526 if (R.getTypePtr()->isObjCInterfaceType()) { 1527 Diag(D.getIdentifierLoc(), diag::err_statically_allocated_object); 1528 InvalidDecl = true; 1529 } 1530 1531 VarDecl *NewVD; 1532 VarDecl::StorageClass SC; 1533 switch (D.getDeclSpec().getStorageClassSpec()) { 1534 default: assert(0 && "Unknown storage class!"); 1535 case DeclSpec::SCS_unspecified: SC = VarDecl::None; break; 1536 case DeclSpec::SCS_extern: SC = VarDecl::Extern; break; 1537 case DeclSpec::SCS_static: SC = VarDecl::Static; break; 1538 case DeclSpec::SCS_auto: SC = VarDecl::Auto; break; 1539 case DeclSpec::SCS_register: SC = VarDecl::Register; break; 1540 case DeclSpec::SCS_private_extern: SC = VarDecl::PrivateExtern; break; 1541 case DeclSpec::SCS_mutable: 1542 // mutable can only appear on non-static class members, so it's always 1543 // an error here 1544 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 1545 InvalidDecl = true; 1546 SC = VarDecl::None; 1547 break; 1548 } 1549 1550 IdentifierInfo *II = Name.getAsIdentifierInfo(); 1551 if (!II) { 1552 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 1553 << Name.getAsString(); 1554 return 0; 1555 } 1556 1557 if (DC->isRecord()) { 1558 // This is a static data member for a C++ class. 1559 NewVD = CXXClassVarDecl::Create(Context, cast<CXXRecordDecl>(DC), 1560 D.getIdentifierLoc(), II, 1561 R); 1562 } else { 1563 bool ThreadSpecified = D.getDeclSpec().isThreadSpecified(); 1564 if (S->getFnParent() == 0) { 1565 // C99 6.9p2: The storage-class specifiers auto and register shall not 1566 // appear in the declaration specifiers in an external declaration. 1567 if (SC == VarDecl::Auto || SC == VarDecl::Register) { 1568 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 1569 InvalidDecl = true; 1570 } 1571 } 1572 NewVD = VarDecl::Create(Context, DC, D.getIdentifierLoc(), 1573 II, R, SC, 1574 // FIXME: Move to DeclGroup... 1575 D.getDeclSpec().getSourceRange().getBegin()); 1576 NewVD->setThreadSpecified(ThreadSpecified); 1577 } 1578 NewVD->setNextDeclarator(LastDeclarator); 1579 1580 // Handle attributes prior to checking for duplicates in MergeVarDecl 1581 ProcessDeclAttributes(NewVD, D); 1582 1583 // Handle GNU asm-label extension (encoded as an attribute). 1584 if (Expr *E = (Expr*) D.getAsmLabel()) { 1585 // The parser guarantees this is a string. 1586 StringLiteral *SE = cast<StringLiteral>(E); 1587 NewVD->addAttr(::new (Context) AsmLabelAttr(std::string(SE->getStrData(), 1588 SE->getByteLength()))); 1589 } 1590 1591 // Emit an error if an address space was applied to decl with local storage. 1592 // This includes arrays of objects with address space qualifiers, but not 1593 // automatic variables that point to other address spaces. 1594 // ISO/IEC TR 18037 S5.1.2 1595 if (NewVD->hasLocalStorage() && (NewVD->getType().getAddressSpace() != 0)) { 1596 Diag(D.getIdentifierLoc(), diag::err_as_qualified_auto_decl); 1597 InvalidDecl = true; 1598 } 1599 1600 if (NewVD->hasLocalStorage() && NewVD->getType().isObjCGCWeak()) { 1601 Diag(D.getIdentifierLoc(), diag::warn_attribute_weak_on_local); 1602 } 1603 1604 bool isIllegalVLA = R->isVariableArrayType() && NewVD->hasGlobalStorage(); 1605 bool isIllegalVM = R->isVariablyModifiedType() && NewVD->hasLinkage(); 1606 if (isIllegalVLA || isIllegalVM) { 1607 bool SizeIsNegative; 1608 QualType FixedTy = 1609 TryToFixInvalidVariablyModifiedType(R, Context, SizeIsNegative); 1610 if (!FixedTy.isNull()) { 1611 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 1612 NewVD->setType(FixedTy); 1613 } else if (R->isVariableArrayType()) { 1614 NewVD->setInvalidDecl(); 1615 1616 const VariableArrayType *VAT = Context.getAsVariableArrayType(R); 1617 // FIXME: This won't give the correct result for 1618 // int a[10][n]; 1619 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 1620 1621 if (NewVD->isFileVarDecl()) 1622 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 1623 << SizeRange; 1624 else if (NewVD->getStorageClass() == VarDecl::Static) 1625 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 1626 << SizeRange; 1627 else 1628 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 1629 << SizeRange; 1630 } else { 1631 InvalidDecl = true; 1632 1633 if (NewVD->isFileVarDecl()) 1634 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 1635 else 1636 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 1637 } 1638 } 1639 1640 // If name lookup finds a previous declaration that is not in the 1641 // same scope as the new declaration, this may still be an 1642 // acceptable redeclaration. 1643 if (PrevDecl && !isDeclInScope(PrevDecl, DC, S) && 1644 !(NewVD->hasLinkage() && 1645 isOutOfScopePreviousDeclaration(PrevDecl, DC, Context))) 1646 PrevDecl = 0; 1647 1648 if (!PrevDecl && NewVD->isExternC(Context)) { 1649 // Since we did not find anything by this name and we're declaring 1650 // an extern "C" variable, look for a non-visible extern "C" 1651 // declaration with the same name. 1652 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 1653 = LocallyScopedExternalDecls.find(Name); 1654 if (Pos != LocallyScopedExternalDecls.end()) 1655 PrevDecl = Pos->second; 1656 } 1657 1658 // Merge the decl with the existing one if appropriate. 1659 if (PrevDecl) { 1660 if (isa<FieldDecl>(PrevDecl) && D.getCXXScopeSpec().isSet()) { 1661 // The user tried to define a non-static data member 1662 // out-of-line (C++ [dcl.meaning]p1). 1663 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 1664 << D.getCXXScopeSpec().getRange(); 1665 NewVD->Destroy(Context); 1666 return 0; 1667 } 1668 1669 Redeclaration = true; 1670 if (MergeVarDecl(NewVD, PrevDecl)) 1671 InvalidDecl = true; 1672 1673 if (D.getCXXScopeSpec().isSet()) { 1674 // No previous declaration in the qualifying scope. 1675 Diag(D.getIdentifierLoc(), diag::err_typecheck_no_member) 1676 << Name << D.getCXXScopeSpec().getRange(); 1677 InvalidDecl = true; 1678 } 1679 } 1680 1681 // If this is a locally-scoped extern C variable, update the map of 1682 // such variables. 1683 if (CurContext->isFunctionOrMethod() && NewVD->isExternC(Context) && 1684 !InvalidDecl) 1685 RegisterLocallyScopedExternCDecl(NewVD, PrevDecl, S); 1686 1687 return NewVD; 1688} 1689 1690NamedDecl* 1691Sema::ActOnFunctionDeclarator(Scope* S, Declarator& D, DeclContext* DC, 1692 QualType R, Decl *LastDeclarator, 1693 NamedDecl* PrevDecl, bool IsFunctionDefinition, 1694 bool& InvalidDecl, bool &Redeclaration) { 1695 assert(R.getTypePtr()->isFunctionType()); 1696 1697 DeclarationName Name = GetNameForDeclarator(D); 1698 FunctionDecl::StorageClass SC = FunctionDecl::None; 1699 switch (D.getDeclSpec().getStorageClassSpec()) { 1700 default: assert(0 && "Unknown storage class!"); 1701 case DeclSpec::SCS_auto: 1702 case DeclSpec::SCS_register: 1703 case DeclSpec::SCS_mutable: 1704 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 1705 diag::err_typecheck_sclass_func); 1706 InvalidDecl = true; 1707 break; 1708 case DeclSpec::SCS_unspecified: SC = FunctionDecl::None; break; 1709 case DeclSpec::SCS_extern: SC = FunctionDecl::Extern; break; 1710 case DeclSpec::SCS_static: { 1711 if (DC->getLookupContext()->isFunctionOrMethod()) { 1712 // C99 6.7.1p5: 1713 // The declaration of an identifier for a function that has 1714 // block scope shall have no explicit storage-class specifier 1715 // other than extern 1716 // See also (C++ [dcl.stc]p4). 1717 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 1718 diag::err_static_block_func); 1719 SC = FunctionDecl::None; 1720 } else 1721 SC = FunctionDecl::Static; 1722 break; 1723 } 1724 case DeclSpec::SCS_private_extern: SC = FunctionDecl::PrivateExtern;break; 1725 } 1726 1727 bool isInline = D.getDeclSpec().isInlineSpecified(); 1728 // bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 1729 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 1730 1731 FunctionDecl *NewFD; 1732 if (D.getKind() == Declarator::DK_Constructor) { 1733 // This is a C++ constructor declaration. 1734 assert(DC->isRecord() && 1735 "Constructors can only be declared in a member context"); 1736 1737 InvalidDecl = InvalidDecl || CheckConstructorDeclarator(D, R, SC); 1738 1739 // Create the new declaration 1740 NewFD = CXXConstructorDecl::Create(Context, 1741 cast<CXXRecordDecl>(DC), 1742 D.getIdentifierLoc(), Name, R, 1743 isExplicit, isInline, 1744 /*isImplicitlyDeclared=*/false); 1745 1746 if (InvalidDecl) 1747 NewFD->setInvalidDecl(); 1748 } else if (D.getKind() == Declarator::DK_Destructor) { 1749 // This is a C++ destructor declaration. 1750 if (DC->isRecord()) { 1751 InvalidDecl = InvalidDecl || CheckDestructorDeclarator(D, R, SC); 1752 1753 NewFD = CXXDestructorDecl::Create(Context, 1754 cast<CXXRecordDecl>(DC), 1755 D.getIdentifierLoc(), Name, R, 1756 isInline, 1757 /*isImplicitlyDeclared=*/false); 1758 1759 if (InvalidDecl) 1760 NewFD->setInvalidDecl(); 1761 } else { 1762 Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 1763 1764 // Create a FunctionDecl to satisfy the function definition parsing 1765 // code path. 1766 NewFD = FunctionDecl::Create(Context, DC, D.getIdentifierLoc(), 1767 Name, R, SC, isInline, 1768 /*hasPrototype=*/true, 1769 // FIXME: Move to DeclGroup... 1770 D.getDeclSpec().getSourceRange().getBegin()); 1771 InvalidDecl = true; 1772 NewFD->setInvalidDecl(); 1773 } 1774 } else if (D.getKind() == Declarator::DK_Conversion) { 1775 if (!DC->isRecord()) { 1776 Diag(D.getIdentifierLoc(), 1777 diag::err_conv_function_not_member); 1778 return 0; 1779 } else { 1780 InvalidDecl = InvalidDecl || CheckConversionDeclarator(D, R, SC); 1781 1782 NewFD = CXXConversionDecl::Create(Context, cast<CXXRecordDecl>(DC), 1783 D.getIdentifierLoc(), Name, R, 1784 isInline, isExplicit); 1785 1786 if (InvalidDecl) 1787 NewFD->setInvalidDecl(); 1788 } 1789 } else if (DC->isRecord()) { 1790 // This is a C++ method declaration. 1791 NewFD = CXXMethodDecl::Create(Context, cast<CXXRecordDecl>(DC), 1792 D.getIdentifierLoc(), Name, R, 1793 (SC == FunctionDecl::Static), isInline); 1794 } else { 1795 NewFD = FunctionDecl::Create(Context, DC, 1796 D.getIdentifierLoc(), 1797 Name, R, SC, isInline, 1798 /*hasPrototype=*/ 1799 (getLangOptions().CPlusPlus || 1800 (D.getNumTypeObjects() && 1801 D.getTypeObject(0).Fun.hasPrototype)), 1802 // FIXME: Move to DeclGroup... 1803 D.getDeclSpec().getSourceRange().getBegin()); 1804 } 1805 NewFD->setNextDeclarator(LastDeclarator); 1806 1807 // Set the lexical context. If the declarator has a C++ 1808 // scope specifier, the lexical context will be different 1809 // from the semantic context. 1810 NewFD->setLexicalDeclContext(CurContext); 1811 1812 // Handle GNU asm-label extension (encoded as an attribute). 1813 if (Expr *E = (Expr*) D.getAsmLabel()) { 1814 // The parser guarantees this is a string. 1815 StringLiteral *SE = cast<StringLiteral>(E); 1816 NewFD->addAttr(::new (Context) AsmLabelAttr(std::string(SE->getStrData(), 1817 SE->getByteLength()))); 1818 } 1819 1820 // Copy the parameter declarations from the declarator D to 1821 // the function declaration NewFD, if they are available. 1822 if (D.getNumTypeObjects() > 0) { 1823 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1824 1825 // Create Decl objects for each parameter, adding them to the 1826 // FunctionDecl. 1827 llvm::SmallVector<ParmVarDecl*, 16> Params; 1828 1829 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 1830 // function that takes no arguments, not a function that takes a 1831 // single void argument. 1832 // We let through "const void" here because Sema::GetTypeForDeclarator 1833 // already checks for that case. 1834 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 1835 FTI.ArgInfo[0].Param && 1836 ((ParmVarDecl*)FTI.ArgInfo[0].Param)->getType()->isVoidType()) { 1837 // empty arg list, don't push any params. 1838 ParmVarDecl *Param = (ParmVarDecl*)FTI.ArgInfo[0].Param; 1839 1840 // In C++, the empty parameter-type-list must be spelled "void"; a 1841 // typedef of void is not permitted. 1842 if (getLangOptions().CPlusPlus && 1843 Param->getType().getUnqualifiedType() != Context.VoidTy) { 1844 Diag(Param->getLocation(), diag::ext_param_typedef_of_void); 1845 } 1846 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 1847 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) 1848 Params.push_back((ParmVarDecl *)FTI.ArgInfo[i].Param); 1849 } 1850 1851 NewFD->setParams(Context, &Params[0], Params.size()); 1852 } else if (R->getAsTypedefType()) { 1853 // When we're declaring a function with a typedef, as in the 1854 // following example, we'll need to synthesize (unnamed) 1855 // parameters for use in the declaration. 1856 // 1857 // @code 1858 // typedef void fn(int); 1859 // fn f; 1860 // @endcode 1861 const FunctionProtoType *FT = R->getAsFunctionProtoType(); 1862 if (!FT) { 1863 // This is a typedef of a function with no prototype, so we 1864 // don't need to do anything. 1865 } else if ((FT->getNumArgs() == 0) || 1866 (FT->getNumArgs() == 1 && !FT->isVariadic() && 1867 FT->getArgType(0)->isVoidType())) { 1868 // This is a zero-argument function. We don't need to do anything. 1869 } else { 1870 // Synthesize a parameter for each argument type. 1871 llvm::SmallVector<ParmVarDecl*, 16> Params; 1872 for (FunctionProtoType::arg_type_iterator ArgType = FT->arg_type_begin(); 1873 ArgType != FT->arg_type_end(); ++ArgType) { 1874 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, 1875 SourceLocation(), 0, 1876 *ArgType, VarDecl::None, 1877 0); 1878 Param->setImplicit(); 1879 Params.push_back(Param); 1880 } 1881 1882 NewFD->setParams(Context, &Params[0], Params.size()); 1883 } 1884 } 1885 1886 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) 1887 InvalidDecl = InvalidDecl || CheckConstructor(Constructor); 1888 else if (isa<CXXDestructorDecl>(NewFD)) { 1889 CXXRecordDecl *Record = cast<CXXRecordDecl>(NewFD->getParent()); 1890 Record->setUserDeclaredDestructor(true); 1891 // C++ [class]p4: A POD-struct is an aggregate class that has [...] no 1892 // user-defined destructor. 1893 Record->setPOD(false); 1894 } else if (CXXConversionDecl *Conversion = 1895 dyn_cast<CXXConversionDecl>(NewFD)) 1896 ActOnConversionDeclarator(Conversion); 1897 1898 // Extra checking for C++ overloaded operators (C++ [over.oper]). 1899 if (NewFD->isOverloadedOperator() && 1900 CheckOverloadedOperatorDeclaration(NewFD)) 1901 NewFD->setInvalidDecl(); 1902 1903 // If name lookup finds a previous declaration that is not in the 1904 // same scope as the new declaration, this may still be an 1905 // acceptable redeclaration. 1906 if (PrevDecl && !isDeclInScope(PrevDecl, DC, S) && 1907 !(NewFD->hasLinkage() && 1908 isOutOfScopePreviousDeclaration(PrevDecl, DC, Context))) 1909 PrevDecl = 0; 1910 1911 if (!PrevDecl && NewFD->isExternC(Context)) { 1912 // Since we did not find anything by this name and we're declaring 1913 // an extern "C" function, look for a non-visible extern "C" 1914 // declaration with the same name. 1915 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 1916 = LocallyScopedExternalDecls.find(Name); 1917 if (Pos != LocallyScopedExternalDecls.end()) 1918 PrevDecl = Pos->second; 1919 } 1920 1921 // Merge or overload the declaration with an existing declaration of 1922 // the same name, if appropriate. 1923 bool OverloadableAttrRequired = false; 1924 if (PrevDecl) { 1925 // Determine whether NewFD is an overload of PrevDecl or 1926 // a declaration that requires merging. If it's an overload, 1927 // there's no more work to do here; we'll just add the new 1928 // function to the scope. 1929 OverloadedFunctionDecl::function_iterator MatchedDecl; 1930 1931 if (!getLangOptions().CPlusPlus && 1932 AllowOverloadingOfFunction(PrevDecl, Context)) { 1933 OverloadableAttrRequired = true; 1934 1935 // Functions marked "overloadable" must have a prototype (that 1936 // we can't get through declaration merging). 1937 if (!R->getAsFunctionProtoType()) { 1938 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_no_prototype) 1939 << NewFD; 1940 InvalidDecl = true; 1941 Redeclaration = true; 1942 1943 // Turn this into a variadic function with no parameters. 1944 R = Context.getFunctionType(R->getAsFunctionType()->getResultType(), 1945 0, 0, true, 0); 1946 NewFD->setType(R); 1947 } 1948 } 1949 1950 if (PrevDecl && 1951 (!AllowOverloadingOfFunction(PrevDecl, Context) || 1952 !IsOverload(NewFD, PrevDecl, MatchedDecl))) { 1953 Redeclaration = true; 1954 Decl *OldDecl = PrevDecl; 1955 1956 // If PrevDecl was an overloaded function, extract the 1957 // FunctionDecl that matched. 1958 if (isa<OverloadedFunctionDecl>(PrevDecl)) 1959 OldDecl = *MatchedDecl; 1960 1961 // NewFD and PrevDecl represent declarations that need to be 1962 // merged. 1963 if (MergeFunctionDecl(NewFD, OldDecl)) 1964 InvalidDecl = true; 1965 1966 if (!InvalidDecl) { 1967 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 1968 1969 // An out-of-line member function declaration must also be a 1970 // definition (C++ [dcl.meaning]p1). 1971 if (!IsFunctionDefinition && D.getCXXScopeSpec().isSet() && 1972 !InvalidDecl) { 1973 Diag(NewFD->getLocation(), diag::err_out_of_line_declaration) 1974 << D.getCXXScopeSpec().getRange(); 1975 NewFD->setInvalidDecl(); 1976 } 1977 } 1978 } 1979 } 1980 1981 if (D.getCXXScopeSpec().isSet() && 1982 (!PrevDecl || !Redeclaration)) { 1983 // The user tried to provide an out-of-line definition for a 1984 // function that is a member of a class or namespace, but there 1985 // was no such member function declared (C++ [class.mfct]p2, 1986 // C++ [namespace.memdef]p2). For example: 1987 // 1988 // class X { 1989 // void f() const; 1990 // }; 1991 // 1992 // void X::f() { } // ill-formed 1993 // 1994 // Complain about this problem, and attempt to suggest close 1995 // matches (e.g., those that differ only in cv-qualifiers and 1996 // whether the parameter types are references). 1997 Diag(D.getIdentifierLoc(), diag::err_member_def_does_not_match) 1998 << cast<NamedDecl>(DC) << D.getCXXScopeSpec().getRange(); 1999 InvalidDecl = true; 2000 2001 LookupResult Prev = LookupQualifiedName(DC, Name, LookupOrdinaryName, 2002 true); 2003 assert(!Prev.isAmbiguous() && 2004 "Cannot have an ambiguity in previous-declaration lookup"); 2005 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 2006 Func != FuncEnd; ++Func) { 2007 if (isa<FunctionDecl>(*Func) && 2008 isNearlyMatchingFunction(Context, cast<FunctionDecl>(*Func), NewFD)) 2009 Diag((*Func)->getLocation(), diag::note_member_def_close_match); 2010 } 2011 2012 PrevDecl = 0; 2013 } 2014 2015 // Handle attributes. We need to have merged decls when handling attributes 2016 // (for example to check for conflicts, etc). 2017 ProcessDeclAttributes(NewFD, D); 2018 AddKnownFunctionAttributes(NewFD); 2019 2020 if (OverloadableAttrRequired && !NewFD->getAttr<OverloadableAttr>()) { 2021 // If a function name is overloadable in C, then every function 2022 // with that name must be marked "overloadable". 2023 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 2024 << Redeclaration << NewFD; 2025 if (PrevDecl) 2026 Diag(PrevDecl->getLocation(), 2027 diag::note_attribute_overloadable_prev_overload); 2028 NewFD->addAttr(::new (Context) OverloadableAttr()); 2029 } 2030 2031 if (getLangOptions().CPlusPlus) { 2032 // In C++, check default arguments now that we have merged decls. Unless 2033 // the lexical context is the class, because in this case this is done 2034 // during delayed parsing anyway. 2035 if (!CurContext->isRecord()) 2036 CheckCXXDefaultArguments(NewFD); 2037 2038 // An out-of-line member function declaration must also be a 2039 // definition (C++ [dcl.meaning]p1). 2040 if (!IsFunctionDefinition && D.getCXXScopeSpec().isSet() && !InvalidDecl) { 2041 Diag(NewFD->getLocation(), diag::err_out_of_line_declaration) 2042 << D.getCXXScopeSpec().getRange(); 2043 InvalidDecl = true; 2044 } 2045 } 2046 2047 // If this is a locally-scoped extern C function, update the 2048 // map of such names. 2049 if (CurContext->isFunctionOrMethod() && NewFD->isExternC(Context) 2050 && !InvalidDecl) 2051 RegisterLocallyScopedExternCDecl(NewFD, PrevDecl, S); 2052 2053 return NewFD; 2054} 2055 2056bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 2057 // FIXME: Need strict checking. In C89, we need to check for 2058 // any assignment, increment, decrement, function-calls, or 2059 // commas outside of a sizeof. In C99, it's the same list, 2060 // except that the aforementioned are allowed in unevaluated 2061 // expressions. Everything else falls under the 2062 // "may accept other forms of constant expressions" exception. 2063 // (We never end up here for C++, so the constant expression 2064 // rules there don't matter.) 2065 if (Init->isConstantInitializer(Context)) 2066 return false; 2067 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 2068 << Init->getSourceRange(); 2069 return true; 2070} 2071 2072void Sema::AddInitializerToDecl(DeclTy *dcl, ExprArg init) { 2073 AddInitializerToDecl(dcl, move(init), /*DirectInit=*/false); 2074} 2075 2076/// AddInitializerToDecl - Adds the initializer Init to the 2077/// declaration dcl. If DirectInit is true, this is C++ direct 2078/// initialization rather than copy initialization. 2079void Sema::AddInitializerToDecl(DeclTy *dcl, ExprArg init, bool DirectInit) { 2080 Decl *RealDecl = static_cast<Decl *>(dcl); 2081 // If there is no declaration, there was an error parsing it. Just ignore 2082 // the initializer. 2083 if (RealDecl == 0) 2084 return; 2085 2086 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 2087 if (!VDecl) { 2088 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 2089 RealDecl->setInvalidDecl(); 2090 return; 2091 } 2092 2093 // Take ownership of the expression, now that we're sure we have somewhere 2094 // to put it. 2095 Expr *Init = static_cast<Expr *>(init.release()); 2096 assert(Init && "missing initializer"); 2097 2098 // Get the decls type and save a reference for later, since 2099 // CheckInitializerTypes may change it. 2100 QualType DclT = VDecl->getType(), SavT = DclT; 2101 if (VDecl->isBlockVarDecl()) { 2102 VarDecl::StorageClass SC = VDecl->getStorageClass(); 2103 if (SC == VarDecl::Extern) { // C99 6.7.8p5 2104 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 2105 VDecl->setInvalidDecl(); 2106 } else if (!VDecl->isInvalidDecl()) { 2107 if (CheckInitializerTypes(Init, DclT, VDecl->getLocation(), 2108 VDecl->getDeclName(), DirectInit)) 2109 VDecl->setInvalidDecl(); 2110 2111 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 2112 // Don't check invalid declarations to avoid emitting useless diagnostics. 2113 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 2114 if (SC == VarDecl::Static) // C99 6.7.8p4. 2115 CheckForConstantInitializer(Init, DclT); 2116 } 2117 } 2118 } else if (VDecl->isFileVarDecl()) { 2119 if (VDecl->getStorageClass() == VarDecl::Extern) 2120 Diag(VDecl->getLocation(), diag::warn_extern_init); 2121 if (!VDecl->isInvalidDecl()) 2122 if (CheckInitializerTypes(Init, DclT, VDecl->getLocation(), 2123 VDecl->getDeclName(), DirectInit)) 2124 VDecl->setInvalidDecl(); 2125 2126 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 2127 // Don't check invalid declarations to avoid emitting useless diagnostics. 2128 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 2129 // C99 6.7.8p4. All file scoped initializers need to be constant. 2130 CheckForConstantInitializer(Init, DclT); 2131 } 2132 } 2133 // If the type changed, it means we had an incomplete type that was 2134 // completed by the initializer. For example: 2135 // int ary[] = { 1, 3, 5 }; 2136 // "ary" transitions from a VariableArrayType to a ConstantArrayType. 2137 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 2138 VDecl->setType(DclT); 2139 Init->setType(DclT); 2140 } 2141 2142 // Attach the initializer to the decl. 2143 VDecl->setInit(Init); 2144 return; 2145} 2146 2147void Sema::ActOnUninitializedDecl(DeclTy *dcl) { 2148 Decl *RealDecl = static_cast<Decl *>(dcl); 2149 2150 // If there is no declaration, there was an error parsing it. Just ignore it. 2151 if (RealDecl == 0) 2152 return; 2153 2154 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 2155 QualType Type = Var->getType(); 2156 // C++ [dcl.init.ref]p3: 2157 // The initializer can be omitted for a reference only in a 2158 // parameter declaration (8.3.5), in the declaration of a 2159 // function return type, in the declaration of a class member 2160 // within its class declaration (9.2), and where the extern 2161 // specifier is explicitly used. 2162 if (Type->isReferenceType() && 2163 Var->getStorageClass() != VarDecl::Extern && 2164 Var->getStorageClass() != VarDecl::PrivateExtern) { 2165 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 2166 << Var->getDeclName() 2167 << SourceRange(Var->getLocation(), Var->getLocation()); 2168 Var->setInvalidDecl(); 2169 return; 2170 } 2171 2172 // C++ [dcl.init]p9: 2173 // 2174 // If no initializer is specified for an object, and the object 2175 // is of (possibly cv-qualified) non-POD class type (or array 2176 // thereof), the object shall be default-initialized; if the 2177 // object is of const-qualified type, the underlying class type 2178 // shall have a user-declared default constructor. 2179 if (getLangOptions().CPlusPlus) { 2180 QualType InitType = Type; 2181 if (const ArrayType *Array = Context.getAsArrayType(Type)) 2182 InitType = Array->getElementType(); 2183 if (Var->getStorageClass() != VarDecl::Extern && 2184 Var->getStorageClass() != VarDecl::PrivateExtern && 2185 InitType->isRecordType()) { 2186 const CXXConstructorDecl *Constructor = 0; 2187 if (!DiagnoseIncompleteType(Var->getLocation(), InitType, 2188 diag::err_invalid_incomplete_type_use)) 2189 Constructor 2190 = PerformInitializationByConstructor(InitType, 0, 0, 2191 Var->getLocation(), 2192 SourceRange(Var->getLocation(), 2193 Var->getLocation()), 2194 Var->getDeclName(), 2195 IK_Default); 2196 if (!Constructor) 2197 Var->setInvalidDecl(); 2198 } 2199 } 2200 2201#if 0 2202 // FIXME: Temporarily disabled because we are not properly parsing 2203 // linkage specifications on declarations, e.g., 2204 // 2205 // extern "C" const CGPoint CGPointerZero; 2206 // 2207 // C++ [dcl.init]p9: 2208 // 2209 // If no initializer is specified for an object, and the 2210 // object is of (possibly cv-qualified) non-POD class type (or 2211 // array thereof), the object shall be default-initialized; if 2212 // the object is of const-qualified type, the underlying class 2213 // type shall have a user-declared default 2214 // constructor. Otherwise, if no initializer is specified for 2215 // an object, the object and its subobjects, if any, have an 2216 // indeterminate initial value; if the object or any of its 2217 // subobjects are of const-qualified type, the program is 2218 // ill-formed. 2219 // 2220 // This isn't technically an error in C, so we don't diagnose it. 2221 // 2222 // FIXME: Actually perform the POD/user-defined default 2223 // constructor check. 2224 if (getLangOptions().CPlusPlus && 2225 Context.getCanonicalType(Type).isConstQualified() && 2226 Var->getStorageClass() != VarDecl::Extern) 2227 Diag(Var->getLocation(), diag::err_const_var_requires_init) 2228 << Var->getName() 2229 << SourceRange(Var->getLocation(), Var->getLocation()); 2230#endif 2231 } 2232} 2233 2234/// The declarators are chained together backwards, reverse the list. 2235Sema::DeclTy *Sema::FinalizeDeclaratorGroup(Scope *S, DeclTy *group) { 2236 // Often we have single declarators, handle them quickly. 2237 Decl *Group = static_cast<Decl*>(group); 2238 if (Group == 0) 2239 return 0; 2240 2241 Decl *NewGroup = 0; 2242 if (Group->getNextDeclarator() == 0) 2243 NewGroup = Group; 2244 else { // reverse the list. 2245 while (Group) { 2246 Decl *Next = Group->getNextDeclarator(); 2247 Group->setNextDeclarator(NewGroup); 2248 NewGroup = Group; 2249 Group = Next; 2250 } 2251 } 2252 // Perform semantic analysis that depends on having fully processed both 2253 // the declarator and initializer. 2254 for (Decl *ID = NewGroup; ID; ID = ID->getNextDeclarator()) { 2255 VarDecl *IDecl = dyn_cast<VarDecl>(ID); 2256 if (!IDecl) 2257 continue; 2258 QualType T = IDecl->getType(); 2259 2260 // Block scope. C99 6.7p7: If an identifier for an object is declared with 2261 // no linkage (C99 6.2.2p6), the type for the object shall be complete... 2262 if (IDecl->isBlockVarDecl() && 2263 IDecl->getStorageClass() != VarDecl::Extern) { 2264 if (!IDecl->isInvalidDecl() && 2265 DiagnoseIncompleteType(IDecl->getLocation(), T, 2266 diag::err_typecheck_decl_incomplete_type)) 2267 IDecl->setInvalidDecl(); 2268 } 2269 // File scope. C99 6.9.2p2: A declaration of an identifier for and 2270 // object that has file scope without an initializer, and without a 2271 // storage-class specifier or with the storage-class specifier "static", 2272 // constitutes a tentative definition. Note: A tentative definition with 2273 // external linkage is valid (C99 6.2.2p5). 2274 if (isTentativeDefinition(IDecl)) { 2275 if (T->isIncompleteArrayType()) { 2276 // C99 6.9.2 (p2, p5): Implicit initialization causes an incomplete 2277 // array to be completed. Don't issue a diagnostic. 2278 } else if (!IDecl->isInvalidDecl() && 2279 DiagnoseIncompleteType(IDecl->getLocation(), T, 2280 diag::err_typecheck_decl_incomplete_type)) 2281 // C99 6.9.2p3: If the declaration of an identifier for an object is 2282 // a tentative definition and has internal linkage (C99 6.2.2p3), the 2283 // declared type shall not be an incomplete type. 2284 IDecl->setInvalidDecl(); 2285 } 2286 if (IDecl->isFileVarDecl()) 2287 CheckForFileScopedRedefinitions(S, IDecl); 2288 } 2289 return NewGroup; 2290} 2291 2292/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 2293/// to introduce parameters into function prototype scope. 2294Sema::DeclTy * 2295Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 2296 const DeclSpec &DS = D.getDeclSpec(); 2297 2298 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 2299 VarDecl::StorageClass StorageClass = VarDecl::None; 2300 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 2301 StorageClass = VarDecl::Register; 2302 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 2303 Diag(DS.getStorageClassSpecLoc(), 2304 diag::err_invalid_storage_class_in_func_decl); 2305 D.getMutableDeclSpec().ClearStorageClassSpecs(); 2306 } 2307 if (DS.isThreadSpecified()) { 2308 Diag(DS.getThreadSpecLoc(), 2309 diag::err_invalid_storage_class_in_func_decl); 2310 D.getMutableDeclSpec().ClearStorageClassSpecs(); 2311 } 2312 2313 // Check that there are no default arguments inside the type of this 2314 // parameter (C++ only). 2315 if (getLangOptions().CPlusPlus) 2316 CheckExtraCXXDefaultArguments(D); 2317 2318 // In this context, we *do not* check D.getInvalidType(). If the declarator 2319 // type was invalid, GetTypeForDeclarator() still returns a "valid" type, 2320 // though it will not reflect the user specified type. 2321 QualType parmDeclType = GetTypeForDeclarator(D, S); 2322 2323 assert(!parmDeclType.isNull() && "GetTypeForDeclarator() returned null type"); 2324 2325 // TODO: CHECK FOR CONFLICTS, multiple decls with same name in one scope. 2326 // Can this happen for params? We already checked that they don't conflict 2327 // among each other. Here they can only shadow globals, which is ok. 2328 IdentifierInfo *II = D.getIdentifier(); 2329 if (II) { 2330 if (NamedDecl *PrevDecl = LookupName(S, II, LookupOrdinaryName)) { 2331 if (PrevDecl->isTemplateParameter()) { 2332 // Maybe we will complain about the shadowed template parameter. 2333 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 2334 // Just pretend that we didn't see the previous declaration. 2335 PrevDecl = 0; 2336 } else if (S->isDeclScope(PrevDecl)) { 2337 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 2338 2339 // Recover by removing the name 2340 II = 0; 2341 D.SetIdentifier(0, D.getIdentifierLoc()); 2342 } 2343 } 2344 } 2345 2346 // Perform the default function/array conversion (C99 6.7.5.3p[7,8]). 2347 // Doing the promotion here has a win and a loss. The win is the type for 2348 // both Decl's and DeclRefExpr's will match (a convenient invariant for the 2349 // code generator). The loss is the orginal type isn't preserved. For example: 2350 // 2351 // void func(int parmvardecl[5]) { // convert "int [5]" to "int *" 2352 // int blockvardecl[5]; 2353 // sizeof(parmvardecl); // size == 4 2354 // sizeof(blockvardecl); // size == 20 2355 // } 2356 // 2357 // For expressions, all implicit conversions are captured using the 2358 // ImplicitCastExpr AST node (we have no such mechanism for Decl's). 2359 // 2360 // FIXME: If a source translation tool needs to see the original type, then 2361 // we need to consider storing both types (in ParmVarDecl)... 2362 // 2363 if (parmDeclType->isArrayType()) { 2364 // int x[restrict 4] -> int *restrict 2365 parmDeclType = Context.getArrayDecayedType(parmDeclType); 2366 } else if (parmDeclType->isFunctionType()) 2367 parmDeclType = Context.getPointerType(parmDeclType); 2368 2369 ParmVarDecl *New = ParmVarDecl::Create(Context, CurContext, 2370 D.getIdentifierLoc(), II, 2371 parmDeclType, StorageClass, 2372 0); 2373 2374 if (D.getInvalidType()) 2375 New->setInvalidDecl(); 2376 2377 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 2378 if (D.getCXXScopeSpec().isSet()) { 2379 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 2380 << D.getCXXScopeSpec().getRange(); 2381 New->setInvalidDecl(); 2382 } 2383 // Parameter declarators cannot be interface types. All ObjC objects are 2384 // passed by reference. 2385 if (parmDeclType->isObjCInterfaceType()) { 2386 Diag(D.getIdentifierLoc(), diag::err_object_cannot_be_by_value) 2387 << "passed"; 2388 New->setInvalidDecl(); 2389 } 2390 2391 // Add the parameter declaration into this scope. 2392 S->AddDecl(New); 2393 if (II) 2394 IdResolver.AddDecl(New); 2395 2396 ProcessDeclAttributes(New, D); 2397 return New; 2398 2399} 2400 2401void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D) { 2402 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 2403 "Not a function declarator!"); 2404 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2405 2406 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 2407 // for a K&R function. 2408 if (!FTI.hasPrototype) { 2409 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 2410 if (FTI.ArgInfo[i].Param == 0) { 2411 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 2412 << FTI.ArgInfo[i].Ident; 2413 // Implicitly declare the argument as type 'int' for lack of a better 2414 // type. 2415 DeclSpec DS; 2416 const char* PrevSpec; // unused 2417 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 2418 PrevSpec); 2419 Declarator ParamD(DS, Declarator::KNRTypeListContext); 2420 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 2421 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 2422 } 2423 } 2424 } 2425} 2426 2427Sema::DeclTy *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Declarator &D) { 2428 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 2429 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 2430 "Not a function declarator!"); 2431 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2432 2433 if (FTI.hasPrototype) { 2434 // FIXME: Diagnose arguments without names in C. 2435 } 2436 2437 Scope *ParentScope = FnBodyScope->getParent(); 2438 2439 return ActOnStartOfFunctionDef(FnBodyScope, 2440 ActOnDeclarator(ParentScope, D, 0, 2441 /*IsFunctionDefinition=*/true)); 2442} 2443 2444Sema::DeclTy *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, DeclTy *D) { 2445 Decl *decl = static_cast<Decl*>(D); 2446 FunctionDecl *FD = cast<FunctionDecl>(decl); 2447 2448 ActiveScope = FnBodyScope; 2449 2450 // See if this is a redefinition. 2451 const FunctionDecl *Definition; 2452 if (FD->getBody(Definition)) { 2453 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 2454 Diag(Definition->getLocation(), diag::note_previous_definition); 2455 } 2456 2457 // Builtin functions cannot be defined. 2458 if (unsigned BuiltinID = FD->getBuiltinID(Context)) { 2459 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 2460 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 2461 FD->setInvalidDecl(); 2462 } 2463 } 2464 2465 // The return type of a function definition must be complete 2466 // (C99 6.9.1p3) 2467 if (FD->getResultType()->isIncompleteType() && 2468 !FD->getResultType()->isVoidType()) { 2469 Diag(FD->getLocation(), diag::err_func_def_incomplete_result) << FD; 2470 FD->setInvalidDecl(); 2471 } 2472 2473 PushDeclContext(FnBodyScope, FD); 2474 2475 // Check the validity of our function parameters 2476 CheckParmsForFunctionDef(FD); 2477 2478 // Introduce our parameters into the function scope 2479 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 2480 ParmVarDecl *Param = FD->getParamDecl(p); 2481 Param->setOwningFunction(FD); 2482 2483 // If this has an identifier, add it to the scope stack. 2484 if (Param->getIdentifier()) 2485 PushOnScopeChains(Param, FnBodyScope); 2486 } 2487 2488 // Checking attributes of current function definition 2489 // dllimport attribute. 2490 if (FD->getAttr<DLLImportAttr>() && (!FD->getAttr<DLLExportAttr>())) { 2491 // dllimport attribute cannot be applied to definition. 2492 if (!(FD->getAttr<DLLImportAttr>())->isInherited()) { 2493 Diag(FD->getLocation(), 2494 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 2495 << "dllimport"; 2496 FD->setInvalidDecl(); 2497 return FD; 2498 } else { 2499 // If a symbol previously declared dllimport is later defined, the 2500 // attribute is ignored in subsequent references, and a warning is 2501 // emitted. 2502 Diag(FD->getLocation(), 2503 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 2504 << FD->getNameAsCString() << "dllimport"; 2505 } 2506 } 2507 return FD; 2508} 2509 2510static bool StatementCreatesScope(Stmt* S) { 2511 bool result = false; 2512 if (DeclStmt* DS = dyn_cast<DeclStmt>(S)) { 2513 for (DeclStmt::decl_iterator i = DS->decl_begin(); 2514 i != DS->decl_end(); ++i) { 2515 if (VarDecl* D = dyn_cast<VarDecl>(*i)) { 2516 result |= D->getType()->isVariablyModifiedType(); 2517 result |= !!D->getAttr<CleanupAttr>(); 2518 } else if (TypedefDecl* D = dyn_cast<TypedefDecl>(*i)) { 2519 result |= D->getUnderlyingType()->isVariablyModifiedType(); 2520 } 2521 } 2522 } 2523 2524 return result; 2525} 2526 2527void Sema::RecursiveCalcLabelScopes(llvm::DenseMap<Stmt*, void*>& LabelScopeMap, 2528 llvm::DenseMap<void*, Stmt*>& PopScopeMap, 2529 std::vector<void*>& ScopeStack, 2530 Stmt* CurStmt, 2531 Stmt* ParentCompoundStmt) { 2532 for (Stmt::child_iterator i = CurStmt->child_begin(); 2533 i != CurStmt->child_end(); ++i) { 2534 if (!*i) continue; 2535 if (StatementCreatesScope(*i)) { 2536 ScopeStack.push_back(*i); 2537 PopScopeMap[*i] = ParentCompoundStmt; 2538 } else if (isa<LabelStmt>(CurStmt)) { 2539 LabelScopeMap[CurStmt] = ScopeStack.size() ? ScopeStack.back() : 0; 2540 } 2541 if (isa<DeclStmt>(*i)) continue; 2542 Stmt* CurCompound = isa<CompoundStmt>(*i) ? *i : ParentCompoundStmt; 2543 RecursiveCalcLabelScopes(LabelScopeMap, PopScopeMap, ScopeStack, 2544 *i, CurCompound); 2545 } 2546 2547 while (ScopeStack.size() && PopScopeMap[ScopeStack.back()] == CurStmt) { 2548 ScopeStack.pop_back(); 2549 } 2550} 2551 2552void Sema::RecursiveCalcJumpScopes(llvm::DenseMap<Stmt*, void*>& LabelScopeMap, 2553 llvm::DenseMap<void*, Stmt*>& PopScopeMap, 2554 llvm::DenseMap<Stmt*, void*>& GotoScopeMap, 2555 std::vector<void*>& ScopeStack, 2556 Stmt* CurStmt) { 2557 for (Stmt::child_iterator i = CurStmt->child_begin(); 2558 i != CurStmt->child_end(); ++i) { 2559 if (!*i) continue; 2560 if (StatementCreatesScope(*i)) { 2561 ScopeStack.push_back(*i); 2562 } else if (GotoStmt* GS = dyn_cast<GotoStmt>(*i)) { 2563 void* LScope = LabelScopeMap[GS->getLabel()]; 2564 if (LScope) { 2565 bool foundScopeInStack = false; 2566 for (unsigned i = ScopeStack.size(); i > 0; --i) { 2567 if (LScope == ScopeStack[i-1]) { 2568 foundScopeInStack = true; 2569 break; 2570 } 2571 } 2572 if (!foundScopeInStack) { 2573 Diag(GS->getSourceRange().getBegin(), diag::err_goto_into_scope); 2574 } 2575 } 2576 } 2577 if (isa<DeclStmt>(*i)) continue; 2578 RecursiveCalcJumpScopes(LabelScopeMap, PopScopeMap, GotoScopeMap, ScopeStack, *i); 2579 } 2580 2581 while (ScopeStack.size() && PopScopeMap[ScopeStack.back()] == CurStmt) { 2582 ScopeStack.pop_back(); 2583 } 2584} 2585 2586Sema::DeclTy *Sema::ActOnFinishFunctionBody(DeclTy *D, StmtArg BodyArg) { 2587 Decl *dcl = static_cast<Decl *>(D); 2588 Stmt *Body = static_cast<Stmt*>(BodyArg.release()); 2589 if (FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(dcl)) { 2590 FD->setBody(Body); 2591 assert(FD == getCurFunctionDecl() && "Function parsing confused"); 2592 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 2593 assert(MD == getCurMethodDecl() && "Method parsing confused"); 2594 MD->setBody((Stmt*)Body); 2595 } else { 2596 Body->Destroy(Context); 2597 return 0; 2598 } 2599 PopDeclContext(); 2600 2601 // FIXME: Temporary hack to workaround nested C++ functions. For example: 2602 // class C2 { 2603 // void f() { 2604 // class LC1 { 2605 // int m() { return 1; } 2606 // }; 2607 // } 2608 // }; 2609 if (ActiveScope == 0) 2610 return D; 2611 2612 // Verify and clean out per-function state. 2613 2614 bool HaveLabels = !ActiveScope->LabelMap.empty(); 2615 // Check goto/label use. 2616 for (Scope::LabelMapTy::iterator I = ActiveScope->LabelMap.begin(), 2617 E = ActiveScope->LabelMap.end(); I != E; ++I) { 2618 // Verify that we have no forward references left. If so, there was a goto 2619 // or address of a label taken, but no definition of it. Label fwd 2620 // definitions are indicated with a null substmt. 2621 LabelStmt *L = static_cast<LabelStmt*>(I->second); 2622 if (L->getSubStmt() == 0) { 2623 // Emit error. 2624 Diag(L->getIdentLoc(), diag::err_undeclared_label_use) << L->getName(); 2625 2626 // At this point, we have gotos that use the bogus label. Stitch it into 2627 // the function body so that they aren't leaked and that the AST is well 2628 // formed. 2629 if (Body) { 2630#if 0 2631 // FIXME: Why do this? Having a 'push_back' in CompoundStmt is ugly, 2632 // and the AST is malformed anyway. We should just blow away 'L'. 2633 L->setSubStmt(new (Context) NullStmt(L->getIdentLoc())); 2634 cast<CompoundStmt>(Body)->push_back(L); 2635#else 2636 L->Destroy(Context); 2637#endif 2638 } else { 2639 // The whole function wasn't parsed correctly, just delete this. 2640 L->Destroy(Context); 2641 } 2642 } 2643 } 2644 // This reset is for both functions and methods. 2645 ActiveScope = 0; 2646 2647 if (!Body) return D; 2648 2649 if (HaveLabels) { 2650 llvm::DenseMap<Stmt*, void*> LabelScopeMap; 2651 llvm::DenseMap<void*, Stmt*> PopScopeMap; 2652 llvm::DenseMap<Stmt*, void*> GotoScopeMap; 2653 std::vector<void*> ScopeStack; 2654 RecursiveCalcLabelScopes(LabelScopeMap, PopScopeMap, ScopeStack, Body, Body); 2655 RecursiveCalcJumpScopes(LabelScopeMap, PopScopeMap, GotoScopeMap, ScopeStack, Body); 2656 } 2657 2658 return D; 2659} 2660 2661/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 2662/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 2663NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 2664 IdentifierInfo &II, Scope *S) { 2665 // Before we produce a declaration for an implicitly defined 2666 // function, see whether there was a locally-scoped declaration of 2667 // this name as a function or variable. If so, use that 2668 // (non-visible) declaration, and complain about it. 2669 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 2670 = LocallyScopedExternalDecls.find(&II); 2671 if (Pos != LocallyScopedExternalDecls.end()) { 2672 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 2673 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 2674 return Pos->second; 2675 } 2676 2677 // Extension in C99. Legal in C90, but warn about it. 2678 if (getLangOptions().C99) 2679 Diag(Loc, diag::ext_implicit_function_decl) << &II; 2680 else 2681 Diag(Loc, diag::warn_implicit_function_decl) << &II; 2682 2683 // FIXME: handle stuff like: 2684 // void foo() { extern float X(); } 2685 // void bar() { X(); } <-- implicit decl for X in another scope. 2686 2687 // Set a Declarator for the implicit definition: int foo(); 2688 const char *Dummy; 2689 DeclSpec DS; 2690 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy); 2691 Error = Error; // Silence warning. 2692 assert(!Error && "Error setting up implicit decl!"); 2693 Declarator D(DS, Declarator::BlockContext); 2694 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 2695 0, 0, 0, Loc, D), 2696 SourceLocation()); 2697 D.SetIdentifier(&II, Loc); 2698 2699 // Insert this function into translation-unit scope. 2700 2701 DeclContext *PrevDC = CurContext; 2702 CurContext = Context.getTranslationUnitDecl(); 2703 2704 FunctionDecl *FD = 2705 dyn_cast<FunctionDecl>(static_cast<Decl*>(ActOnDeclarator(TUScope, D, 0))); 2706 FD->setImplicit(); 2707 2708 CurContext = PrevDC; 2709 2710 AddKnownFunctionAttributes(FD); 2711 2712 return FD; 2713} 2714 2715/// \brief Adds any function attributes that we know a priori based on 2716/// the declaration of this function. 2717/// 2718/// These attributes can apply both to implicitly-declared builtins 2719/// (like __builtin___printf_chk) or to library-declared functions 2720/// like NSLog or printf. 2721void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 2722 if (FD->isInvalidDecl()) 2723 return; 2724 2725 // If this is a built-in function, map its builtin attributes to 2726 // actual attributes. 2727 if (unsigned BuiltinID = FD->getBuiltinID(Context)) { 2728 // Handle printf-formatting attributes. 2729 unsigned FormatIdx; 2730 bool HasVAListArg; 2731 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 2732 if (!FD->getAttr<FormatAttr>()) 2733 FD->addAttr(::new (Context) FormatAttr("printf", FormatIdx + 1, 2734 FormatIdx + 2)); 2735 } 2736 2737 // Mark const if we don't care about errno and that is the only 2738 // thing preventing the function from being const. This allows 2739 // IRgen to use LLVM intrinsics for such functions. 2740 if (!getLangOptions().MathErrno && 2741 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 2742 if (!FD->getAttr<ConstAttr>()) 2743 FD->addAttr(::new (Context) ConstAttr()); 2744 } 2745 } 2746 2747 IdentifierInfo *Name = FD->getIdentifier(); 2748 if (!Name) 2749 return; 2750 if ((!getLangOptions().CPlusPlus && 2751 FD->getDeclContext()->isTranslationUnit()) || 2752 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 2753 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 2754 LinkageSpecDecl::lang_c)) { 2755 // Okay: this could be a libc/libm/Objective-C function we know 2756 // about. 2757 } else 2758 return; 2759 2760 unsigned KnownID; 2761 for (KnownID = 0; KnownID != id_num_known_functions; ++KnownID) 2762 if (KnownFunctionIDs[KnownID] == Name) 2763 break; 2764 2765 switch (KnownID) { 2766 case id_NSLog: 2767 case id_NSLogv: 2768 if (const FormatAttr *Format = FD->getAttr<FormatAttr>()) { 2769 // FIXME: We known better than our headers. 2770 const_cast<FormatAttr *>(Format)->setType("printf"); 2771 } else 2772 FD->addAttr(::new (Context) FormatAttr("printf", 1, 2)); 2773 break; 2774 2775 case id_asprintf: 2776 case id_vasprintf: 2777 if (!FD->getAttr<FormatAttr>()) 2778 FD->addAttr(::new (Context) FormatAttr("printf", 2, 3)); 2779 break; 2780 2781 default: 2782 // Unknown function or known function without any attributes to 2783 // add. Do nothing. 2784 break; 2785 } 2786} 2787 2788TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 2789 Decl *LastDeclarator) { 2790 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 2791 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 2792 2793 // Scope manipulation handled by caller. 2794 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 2795 D.getIdentifierLoc(), 2796 D.getIdentifier(), 2797 T); 2798 NewTD->setNextDeclarator(LastDeclarator); 2799 if (D.getInvalidType()) 2800 NewTD->setInvalidDecl(); 2801 return NewTD; 2802} 2803 2804/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 2805/// former case, Name will be non-null. In the later case, Name will be null. 2806/// TagSpec indicates what kind of tag this is. TK indicates whether this is a 2807/// reference/declaration/definition of a tag. 2808Sema::DeclTy *Sema::ActOnTag(Scope *S, unsigned TagSpec, TagKind TK, 2809 SourceLocation KWLoc, const CXXScopeSpec &SS, 2810 IdentifierInfo *Name, SourceLocation NameLoc, 2811 AttributeList *Attr) { 2812 // If this is not a definition, it must have a name. 2813 assert((Name != 0 || TK == TK_Definition) && 2814 "Nameless record must be a definition!"); 2815 2816 TagDecl::TagKind Kind; 2817 switch (TagSpec) { 2818 default: assert(0 && "Unknown tag type!"); 2819 case DeclSpec::TST_struct: Kind = TagDecl::TK_struct; break; 2820 case DeclSpec::TST_union: Kind = TagDecl::TK_union; break; 2821 case DeclSpec::TST_class: Kind = TagDecl::TK_class; break; 2822 case DeclSpec::TST_enum: Kind = TagDecl::TK_enum; break; 2823 } 2824 2825 DeclContext *SearchDC = CurContext; 2826 DeclContext *DC = CurContext; 2827 NamedDecl *PrevDecl = 0; 2828 2829 bool Invalid = false; 2830 2831 if (Name && SS.isNotEmpty()) { 2832 // We have a nested-name tag ('struct foo::bar'). 2833 2834 // Check for invalid 'foo::'. 2835 if (SS.isInvalid()) { 2836 Name = 0; 2837 goto CreateNewDecl; 2838 } 2839 2840 DC = static_cast<DeclContext*>(SS.getScopeRep()); 2841 SearchDC = DC; 2842 // Look-up name inside 'foo::'. 2843 PrevDecl = dyn_cast_or_null<TagDecl>( 2844 LookupQualifiedName(DC, Name, LookupTagName, true).getAsDecl()); 2845 2846 // A tag 'foo::bar' must already exist. 2847 if (PrevDecl == 0) { 2848 Diag(NameLoc, diag::err_not_tag_in_scope) << Name << SS.getRange(); 2849 Name = 0; 2850 goto CreateNewDecl; 2851 } 2852 } else if (Name) { 2853 // If this is a named struct, check to see if there was a previous forward 2854 // declaration or definition. 2855 // FIXME: We're looking into outer scopes here, even when we 2856 // shouldn't be. Doing so can result in ambiguities that we 2857 // shouldn't be diagnosing. 2858 LookupResult R = LookupName(S, Name, LookupTagName, 2859 /*RedeclarationOnly=*/(TK != TK_Reference)); 2860 if (R.isAmbiguous()) { 2861 DiagnoseAmbiguousLookup(R, Name, NameLoc); 2862 // FIXME: This is not best way to recover from case like: 2863 // 2864 // struct S s; 2865 // 2866 // causes needless err_ovl_no_viable_function_in_init latter. 2867 Name = 0; 2868 PrevDecl = 0; 2869 Invalid = true; 2870 } 2871 else 2872 PrevDecl = R; 2873 2874 if (!getLangOptions().CPlusPlus && TK != TK_Reference) { 2875 // FIXME: This makes sure that we ignore the contexts associated 2876 // with C structs, unions, and enums when looking for a matching 2877 // tag declaration or definition. See the similar lookup tweak 2878 // in Sema::LookupName; is there a better way to deal with this? 2879 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 2880 SearchDC = SearchDC->getParent(); 2881 } 2882 } 2883 2884 if (PrevDecl && PrevDecl->isTemplateParameter()) { 2885 // Maybe we will complain about the shadowed template parameter. 2886 DiagnoseTemplateParameterShadow(NameLoc, PrevDecl); 2887 // Just pretend that we didn't see the previous declaration. 2888 PrevDecl = 0; 2889 } 2890 2891 if (PrevDecl) { 2892 // Check whether the previous declaration is usable. 2893 (void)DiagnoseUseOfDecl(PrevDecl, NameLoc); 2894 2895 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 2896 // If this is a use of a previous tag, or if the tag is already declared 2897 // in the same scope (so that the definition/declaration completes or 2898 // rementions the tag), reuse the decl. 2899 if (TK == TK_Reference || isDeclInScope(PrevDecl, SearchDC, S)) { 2900 // Make sure that this wasn't declared as an enum and now used as a 2901 // struct or something similar. 2902 if (PrevTagDecl->getTagKind() != Kind) { 2903 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 2904 Diag(PrevDecl->getLocation(), diag::note_previous_use); 2905 // Recover by making this an anonymous redefinition. 2906 Name = 0; 2907 PrevDecl = 0; 2908 Invalid = true; 2909 } else { 2910 // If this is a use, just return the declaration we found. 2911 2912 // FIXME: In the future, return a variant or some other clue 2913 // for the consumer of this Decl to know it doesn't own it. 2914 // For our current ASTs this shouldn't be a problem, but will 2915 // need to be changed with DeclGroups. 2916 if (TK == TK_Reference) 2917 return PrevDecl; 2918 2919 // Diagnose attempts to redefine a tag. 2920 if (TK == TK_Definition) { 2921 if (TagDecl *Def = PrevTagDecl->getDefinition(Context)) { 2922 Diag(NameLoc, diag::err_redefinition) << Name; 2923 Diag(Def->getLocation(), diag::note_previous_definition); 2924 // If this is a redefinition, recover by making this 2925 // struct be anonymous, which will make any later 2926 // references get the previous definition. 2927 Name = 0; 2928 PrevDecl = 0; 2929 Invalid = true; 2930 } else { 2931 // If the type is currently being defined, complain 2932 // about a nested redefinition. 2933 TagType *Tag = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 2934 if (Tag->isBeingDefined()) { 2935 Diag(NameLoc, diag::err_nested_redefinition) << Name; 2936 Diag(PrevTagDecl->getLocation(), 2937 diag::note_previous_definition); 2938 Name = 0; 2939 PrevDecl = 0; 2940 Invalid = true; 2941 } 2942 } 2943 2944 // Okay, this is definition of a previously declared or referenced 2945 // tag PrevDecl. We're going to create a new Decl for it. 2946 } 2947 } 2948 // If we get here we have (another) forward declaration or we 2949 // have a definition. Just create a new decl. 2950 } else { 2951 // If we get here, this is a definition of a new tag type in a nested 2952 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 2953 // new decl/type. We set PrevDecl to NULL so that the entities 2954 // have distinct types. 2955 PrevDecl = 0; 2956 } 2957 // If we get here, we're going to create a new Decl. If PrevDecl 2958 // is non-NULL, it's a definition of the tag declared by 2959 // PrevDecl. If it's NULL, we have a new definition. 2960 } else { 2961 // PrevDecl is a namespace, template, or anything else 2962 // that lives in the IDNS_Tag identifier namespace. 2963 if (isDeclInScope(PrevDecl, SearchDC, S)) { 2964 // The tag name clashes with a namespace name, issue an error and 2965 // recover by making this tag be anonymous. 2966 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 2967 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 2968 Name = 0; 2969 PrevDecl = 0; 2970 Invalid = true; 2971 } else { 2972 // The existing declaration isn't relevant to us; we're in a 2973 // new scope, so clear out the previous declaration. 2974 PrevDecl = 0; 2975 } 2976 } 2977 } else if (TK == TK_Reference && SS.isEmpty() && Name && 2978 (Kind != TagDecl::TK_enum)) { 2979 // C++ [basic.scope.pdecl]p5: 2980 // -- for an elaborated-type-specifier of the form 2981 // 2982 // class-key identifier 2983 // 2984 // if the elaborated-type-specifier is used in the 2985 // decl-specifier-seq or parameter-declaration-clause of a 2986 // function defined in namespace scope, the identifier is 2987 // declared as a class-name in the namespace that contains 2988 // the declaration; otherwise, except as a friend 2989 // declaration, the identifier is declared in the smallest 2990 // non-class, non-function-prototype scope that contains the 2991 // declaration. 2992 // 2993 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 2994 // C structs and unions. 2995 2996 // Find the context where we'll be declaring the tag. 2997 // FIXME: We would like to maintain the current DeclContext as the 2998 // lexical context, 2999 while (SearchDC->isRecord()) 3000 SearchDC = SearchDC->getParent(); 3001 3002 // Find the scope where we'll be declaring the tag. 3003 while (S->isClassScope() || 3004 (getLangOptions().CPlusPlus && S->isFunctionPrototypeScope()) || 3005 ((S->getFlags() & Scope::DeclScope) == 0) || 3006 (S->getEntity() && 3007 ((DeclContext *)S->getEntity())->isTransparentContext())) 3008 S = S->getParent(); 3009 } 3010 3011CreateNewDecl: 3012 3013 // If there is an identifier, use the location of the identifier as the 3014 // location of the decl, otherwise use the location of the struct/union 3015 // keyword. 3016 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 3017 3018 // Otherwise, create a new declaration. If there is a previous 3019 // declaration of the same entity, the two will be linked via 3020 // PrevDecl. 3021 TagDecl *New; 3022 3023 if (Kind == TagDecl::TK_enum) { 3024 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 3025 // enum X { A, B, C } D; D should chain to X. 3026 New = EnumDecl::Create(Context, SearchDC, Loc, Name, 3027 cast_or_null<EnumDecl>(PrevDecl)); 3028 // If this is an undefined enum, warn. 3029 if (TK != TK_Definition) Diag(Loc, diag::ext_forward_ref_enum); 3030 } else { 3031 // struct/union/class 3032 3033 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 3034 // struct X { int A; } D; D should chain to X. 3035 if (getLangOptions().CPlusPlus) 3036 // FIXME: Look for a way to use RecordDecl for simple structs. 3037 New = CXXRecordDecl::Create(Context, Kind, SearchDC, Loc, Name, 3038 cast_or_null<CXXRecordDecl>(PrevDecl)); 3039 else 3040 New = RecordDecl::Create(Context, Kind, SearchDC, Loc, Name, 3041 cast_or_null<RecordDecl>(PrevDecl)); 3042 } 3043 3044 if (Kind != TagDecl::TK_enum) { 3045 // Handle #pragma pack: if the #pragma pack stack has non-default 3046 // alignment, make up a packed attribute for this decl. These 3047 // attributes are checked when the ASTContext lays out the 3048 // structure. 3049 // 3050 // It is important for implementing the correct semantics that this 3051 // happen here (in act on tag decl). The #pragma pack stack is 3052 // maintained as a result of parser callbacks which can occur at 3053 // many points during the parsing of a struct declaration (because 3054 // the #pragma tokens are effectively skipped over during the 3055 // parsing of the struct). 3056 if (unsigned Alignment = getPragmaPackAlignment()) 3057 New->addAttr(::new (Context) PackedAttr(Alignment * 8)); 3058 } 3059 3060 if (getLangOptions().CPlusPlus && SS.isEmpty() && Name && !Invalid) { 3061 // C++ [dcl.typedef]p3: 3062 // [...] Similarly, in a given scope, a class or enumeration 3063 // shall not be declared with the same name as a typedef-name 3064 // that is declared in that scope and refers to a type other 3065 // than the class or enumeration itself. 3066 LookupResult Lookup = LookupName(S, Name, LookupOrdinaryName, true); 3067 TypedefDecl *PrevTypedef = 0; 3068 if (Lookup.getKind() == LookupResult::Found) 3069 PrevTypedef = dyn_cast<TypedefDecl>(Lookup.getAsDecl()); 3070 3071 if (PrevTypedef && isDeclInScope(PrevTypedef, SearchDC, S) && 3072 Context.getCanonicalType(Context.getTypeDeclType(PrevTypedef)) != 3073 Context.getCanonicalType(Context.getTypeDeclType(New))) { 3074 Diag(Loc, diag::err_tag_definition_of_typedef) 3075 << Context.getTypeDeclType(New) 3076 << PrevTypedef->getUnderlyingType(); 3077 Diag(PrevTypedef->getLocation(), diag::note_previous_definition); 3078 Invalid = true; 3079 } 3080 } 3081 3082 if (Invalid) 3083 New->setInvalidDecl(); 3084 3085 if (Attr) 3086 ProcessDeclAttributeList(New, Attr); 3087 3088 // If we're declaring or defining a tag in function prototype scope 3089 // in C, note that this type can only be used within the function. 3090 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 3091 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 3092 3093 // Set the lexical context. If the tag has a C++ scope specifier, the 3094 // lexical context will be different from the semantic context. 3095 New->setLexicalDeclContext(CurContext); 3096 3097 if (TK == TK_Definition) 3098 New->startDefinition(); 3099 3100 // If this has an identifier, add it to the scope stack. 3101 if (Name) { 3102 S = getNonFieldDeclScope(S); 3103 PushOnScopeChains(New, S); 3104 } else { 3105 CurContext->addDecl(New); 3106 } 3107 3108 return New; 3109} 3110 3111void Sema::ActOnTagStartDefinition(Scope *S, DeclTy *TagD) { 3112 AdjustDeclIfTemplate(TagD); 3113 TagDecl *Tag = cast<TagDecl>((Decl *)TagD); 3114 3115 // Enter the tag context. 3116 PushDeclContext(S, Tag); 3117 3118 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Tag)) { 3119 FieldCollector->StartClass(); 3120 3121 if (Record->getIdentifier()) { 3122 // C++ [class]p2: 3123 // [...] The class-name is also inserted into the scope of the 3124 // class itself; this is known as the injected-class-name. For 3125 // purposes of access checking, the injected-class-name is treated 3126 // as if it were a public member name. 3127 RecordDecl *InjectedClassName 3128 = CXXRecordDecl::Create(Context, Record->getTagKind(), 3129 CurContext, Record->getLocation(), 3130 Record->getIdentifier(), Record); 3131 InjectedClassName->setImplicit(); 3132 PushOnScopeChains(InjectedClassName, S); 3133 } 3134 } 3135} 3136 3137void Sema::ActOnTagFinishDefinition(Scope *S, DeclTy *TagD) { 3138 AdjustDeclIfTemplate(TagD); 3139 TagDecl *Tag = cast<TagDecl>((Decl *)TagD); 3140 3141 if (isa<CXXRecordDecl>(Tag)) 3142 FieldCollector->FinishClass(); 3143 3144 // Exit this scope of this tag's definition. 3145 PopDeclContext(); 3146 3147 // Notify the consumer that we've defined a tag. 3148 Consumer.HandleTagDeclDefinition(Tag); 3149} 3150 3151bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName, 3152 QualType FieldTy, const Expr *BitWidth) { 3153 // FIXME: 6.7.2.1p4 - verify the field type. 3154 3155 llvm::APSInt Value; 3156 if (VerifyIntegerConstantExpression(BitWidth, &Value)) 3157 return true; 3158 3159 // Zero-width bitfield is ok for anonymous field. 3160 if (Value == 0 && FieldName) 3161 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 3162 3163 if (Value.isNegative()) 3164 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) << FieldName; 3165 3166 uint64_t TypeSize = Context.getTypeSize(FieldTy); 3167 // FIXME: We won't need the 0 size once we check that the field type is valid. 3168 if (TypeSize && Value.getZExtValue() > TypeSize) 3169 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 3170 << FieldName << (unsigned)TypeSize; 3171 3172 return false; 3173} 3174 3175/// ActOnField - Each field of a struct/union/class is passed into this in order 3176/// to create a FieldDecl object for it. 3177Sema::DeclTy *Sema::ActOnField(Scope *S, DeclTy *TagD, 3178 SourceLocation DeclStart, 3179 Declarator &D, ExprTy *BitfieldWidth) { 3180 IdentifierInfo *II = D.getIdentifier(); 3181 Expr *BitWidth = (Expr*)BitfieldWidth; 3182 SourceLocation Loc = DeclStart; 3183 RecordDecl *Record = (RecordDecl *)TagD; 3184 if (II) Loc = D.getIdentifierLoc(); 3185 3186 // FIXME: Unnamed fields can be handled in various different ways, for 3187 // example, unnamed unions inject all members into the struct namespace! 3188 3189 QualType T = GetTypeForDeclarator(D, S); 3190 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 3191 bool InvalidDecl = false; 3192 3193 // C99 6.7.2.1p8: A member of a structure or union may have any type other 3194 // than a variably modified type. 3195 if (T->isVariablyModifiedType()) { 3196 bool SizeIsNegative; 3197 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 3198 SizeIsNegative); 3199 if (!FixedTy.isNull()) { 3200 Diag(Loc, diag::warn_illegal_constant_array_size); 3201 T = FixedTy; 3202 } else { 3203 if (SizeIsNegative) 3204 Diag(Loc, diag::err_typecheck_negative_array_size); 3205 else 3206 Diag(Loc, diag::err_typecheck_field_variable_size); 3207 T = Context.IntTy; 3208 InvalidDecl = true; 3209 } 3210 } 3211 3212 if (BitWidth) { 3213 if (VerifyBitField(Loc, II, T, BitWidth)) 3214 InvalidDecl = true; 3215 } else { 3216 // Not a bitfield. 3217 3218 // validate II. 3219 3220 } 3221 3222 FieldDecl *NewFD = FieldDecl::Create(Context, Record, 3223 Loc, II, T, BitWidth, 3224 D.getDeclSpec().getStorageClassSpec() == 3225 DeclSpec::SCS_mutable); 3226 3227 if (II) { 3228 NamedDecl *PrevDecl = LookupName(S, II, LookupMemberName, true); 3229 if (PrevDecl && isDeclInScope(PrevDecl, CurContext, S) 3230 && !isa<TagDecl>(PrevDecl)) { 3231 Diag(Loc, diag::err_duplicate_member) << II; 3232 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 3233 NewFD->setInvalidDecl(); 3234 Record->setInvalidDecl(); 3235 } 3236 } 3237 3238 if (getLangOptions().CPlusPlus) { 3239 CheckExtraCXXDefaultArguments(D); 3240 if (!T->isPODType()) 3241 cast<CXXRecordDecl>(Record)->setPOD(false); 3242 } 3243 3244 ProcessDeclAttributes(NewFD, D); 3245 if (T.isObjCGCWeak()) 3246 Diag(Loc, diag::warn_attribute_weak_on_field); 3247 3248 if (D.getInvalidType() || InvalidDecl) 3249 NewFD->setInvalidDecl(); 3250 3251 if (II) { 3252 PushOnScopeChains(NewFD, S); 3253 } else 3254 Record->addDecl(NewFD); 3255 3256 return NewFD; 3257} 3258 3259/// TranslateIvarVisibility - Translate visibility from a token ID to an 3260/// AST enum value. 3261static ObjCIvarDecl::AccessControl 3262TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 3263 switch (ivarVisibility) { 3264 default: assert(0 && "Unknown visitibility kind"); 3265 case tok::objc_private: return ObjCIvarDecl::Private; 3266 case tok::objc_public: return ObjCIvarDecl::Public; 3267 case tok::objc_protected: return ObjCIvarDecl::Protected; 3268 case tok::objc_package: return ObjCIvarDecl::Package; 3269 } 3270} 3271 3272/// ActOnIvar - Each ivar field of an objective-c class is passed into this 3273/// in order to create an IvarDecl object for it. 3274Sema::DeclTy *Sema::ActOnIvar(Scope *S, 3275 SourceLocation DeclStart, 3276 Declarator &D, ExprTy *BitfieldWidth, 3277 tok::ObjCKeywordKind Visibility) { 3278 3279 IdentifierInfo *II = D.getIdentifier(); 3280 Expr *BitWidth = (Expr*)BitfieldWidth; 3281 SourceLocation Loc = DeclStart; 3282 if (II) Loc = D.getIdentifierLoc(); 3283 3284 // FIXME: Unnamed fields can be handled in various different ways, for 3285 // example, unnamed unions inject all members into the struct namespace! 3286 3287 QualType T = GetTypeForDeclarator(D, S); 3288 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 3289 bool InvalidDecl = false; 3290 3291 if (BitWidth) { 3292 // 6.7.2.1p3, 6.7.2.1p4 3293 if (VerifyBitField(Loc, II, T, BitWidth)) 3294 InvalidDecl = true; 3295 } else { 3296 // Not a bitfield. 3297 3298 // validate II. 3299 3300 } 3301 3302 // C99 6.7.2.1p8: A member of a structure or union may have any type other 3303 // than a variably modified type. 3304 if (T->isVariablyModifiedType()) { 3305 Diag(Loc, diag::err_typecheck_ivar_variable_size); 3306 InvalidDecl = true; 3307 } 3308 3309 // Get the visibility (access control) for this ivar. 3310 ObjCIvarDecl::AccessControl ac = 3311 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 3312 : ObjCIvarDecl::None; 3313 3314 // Construct the decl. 3315 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, CurContext, Loc, II, T,ac, 3316 (Expr *)BitfieldWidth); 3317 3318 if (II) { 3319 NamedDecl *PrevDecl = LookupName(S, II, LookupMemberName, true); 3320 if (PrevDecl && isDeclInScope(PrevDecl, CurContext, S) 3321 && !isa<TagDecl>(PrevDecl)) { 3322 Diag(Loc, diag::err_duplicate_member) << II; 3323 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 3324 NewID->setInvalidDecl(); 3325 } 3326 } 3327 3328 // Process attributes attached to the ivar. 3329 ProcessDeclAttributes(NewID, D); 3330 3331 if (D.getInvalidType() || InvalidDecl) 3332 NewID->setInvalidDecl(); 3333 3334 if (II) { 3335 // FIXME: When interfaces are DeclContexts, we'll need to add 3336 // these to the interface. 3337 S->AddDecl(NewID); 3338 IdResolver.AddDecl(NewID); 3339 } 3340 3341 return NewID; 3342} 3343 3344void Sema::ActOnFields(Scope* S, 3345 SourceLocation RecLoc, DeclTy *RecDecl, 3346 DeclTy **Fields, unsigned NumFields, 3347 SourceLocation LBrac, SourceLocation RBrac, 3348 AttributeList *Attr) { 3349 Decl *EnclosingDecl = static_cast<Decl*>(RecDecl); 3350 assert(EnclosingDecl && "missing record or interface decl"); 3351 3352 // If the decl this is being inserted into is invalid, then it may be a 3353 // redeclaration or some other bogus case. Don't try to add fields to it. 3354 if (EnclosingDecl->isInvalidDecl()) { 3355 // FIXME: Deallocate fields? 3356 return; 3357 } 3358 3359 3360 // Verify that all the fields are okay. 3361 unsigned NumNamedMembers = 0; 3362 llvm::SmallVector<FieldDecl*, 32> RecFields; 3363 3364 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 3365 for (unsigned i = 0; i != NumFields; ++i) { 3366 FieldDecl *FD = cast_or_null<FieldDecl>(static_cast<Decl*>(Fields[i])); 3367 assert(FD && "missing field decl"); 3368 3369 // Get the type for the field. 3370 Type *FDTy = FD->getType().getTypePtr(); 3371 3372 if (!FD->isAnonymousStructOrUnion()) { 3373 // Remember all fields written by the user. 3374 RecFields.push_back(FD); 3375 } 3376 3377 // C99 6.7.2.1p2 - A field may not be a function type. 3378 if (FDTy->isFunctionType()) { 3379 Diag(FD->getLocation(), diag::err_field_declared_as_function) 3380 << FD->getDeclName(); 3381 FD->setInvalidDecl(); 3382 EnclosingDecl->setInvalidDecl(); 3383 continue; 3384 } 3385 // C99 6.7.2.1p2 - A field may not be an incomplete type except... 3386 if (FDTy->isIncompleteType()) { 3387 if (!Record) { // Incomplete ivar type is always an error. 3388 DiagnoseIncompleteType(FD->getLocation(), FD->getType(), 3389 diag::err_field_incomplete); 3390 FD->setInvalidDecl(); 3391 EnclosingDecl->setInvalidDecl(); 3392 continue; 3393 } 3394 if (i != NumFields-1 || // ... that the last member ... 3395 !Record->isStruct() || // ... of a structure ... 3396 !FDTy->isArrayType()) { //... may have incomplete array type. 3397 DiagnoseIncompleteType(FD->getLocation(), FD->getType(), 3398 diag::err_field_incomplete); 3399 FD->setInvalidDecl(); 3400 EnclosingDecl->setInvalidDecl(); 3401 continue; 3402 } 3403 if (NumNamedMembers < 1) { //... must have more than named member ... 3404 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 3405 << FD->getDeclName(); 3406 FD->setInvalidDecl(); 3407 EnclosingDecl->setInvalidDecl(); 3408 continue; 3409 } 3410 // Okay, we have a legal flexible array member at the end of the struct. 3411 if (Record) 3412 Record->setHasFlexibleArrayMember(true); 3413 } 3414 /// C99 6.7.2.1p2 - a struct ending in a flexible array member cannot be the 3415 /// field of another structure or the element of an array. 3416 if (const RecordType *FDTTy = FDTy->getAsRecordType()) { 3417 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 3418 // If this is a member of a union, then entire union becomes "flexible". 3419 if (Record && Record->isUnion()) { 3420 Record->setHasFlexibleArrayMember(true); 3421 } else { 3422 // If this is a struct/class and this is not the last element, reject 3423 // it. Note that GCC supports variable sized arrays in the middle of 3424 // structures. 3425 if (i != NumFields-1) { 3426 Diag(FD->getLocation(), diag::err_variable_sized_type_in_struct) 3427 << FD->getDeclName(); 3428 FD->setInvalidDecl(); 3429 EnclosingDecl->setInvalidDecl(); 3430 continue; 3431 } 3432 // We support flexible arrays at the end of structs in other structs 3433 // as an extension. 3434 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 3435 << FD->getDeclName(); 3436 if (Record) 3437 Record->setHasFlexibleArrayMember(true); 3438 } 3439 } 3440 } 3441 /// A field cannot be an Objective-c object 3442 if (FDTy->isObjCInterfaceType()) { 3443 Diag(FD->getLocation(), diag::err_statically_allocated_object); 3444 FD->setInvalidDecl(); 3445 EnclosingDecl->setInvalidDecl(); 3446 continue; 3447 } 3448 // Keep track of the number of named members. 3449 if (FD->getIdentifier()) 3450 ++NumNamedMembers; 3451 } 3452 3453 // Okay, we successfully defined 'Record'. 3454 if (Record) { 3455 Record->completeDefinition(Context); 3456 } else { 3457 ObjCIvarDecl **ClsFields = reinterpret_cast<ObjCIvarDecl**>(&RecFields[0]); 3458 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 3459 ID->setIVarList(ClsFields, RecFields.size(), Context); 3460 ID->setLocEnd(RBrac); 3461 3462 // Must enforce the rule that ivars in the base classes may not be 3463 // duplicates. 3464 if (ID->getSuperClass()) { 3465 for (ObjCInterfaceDecl::ivar_iterator IVI = ID->ivar_begin(), 3466 IVE = ID->ivar_end(); IVI != IVE; ++IVI) { 3467 ObjCIvarDecl* Ivar = (*IVI); 3468 IdentifierInfo *II = Ivar->getIdentifier(); 3469 ObjCIvarDecl* prevIvar = ID->getSuperClass()->lookupInstanceVariable(II); 3470 if (prevIvar) { 3471 Diag(Ivar->getLocation(), diag::err_duplicate_member) << II; 3472 Diag(prevIvar->getLocation(), diag::note_previous_declaration); 3473 } 3474 } 3475 } 3476 } else if (ObjCImplementationDecl *IMPDecl = 3477 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 3478 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 3479 IMPDecl->setIVarList(ClsFields, RecFields.size(), Context); 3480 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 3481 } 3482 } 3483 3484 if (Attr) 3485 ProcessDeclAttributeList(Record, Attr); 3486} 3487 3488Sema::DeclTy *Sema::ActOnEnumConstant(Scope *S, DeclTy *theEnumDecl, 3489 DeclTy *lastEnumConst, 3490 SourceLocation IdLoc, IdentifierInfo *Id, 3491 SourceLocation EqualLoc, ExprTy *val) { 3492 EnumDecl *TheEnumDecl = cast<EnumDecl>(static_cast<Decl*>(theEnumDecl)); 3493 EnumConstantDecl *LastEnumConst = 3494 cast_or_null<EnumConstantDecl>(static_cast<Decl*>(lastEnumConst)); 3495 Expr *Val = static_cast<Expr*>(val); 3496 3497 // The scope passed in may not be a decl scope. Zip up the scope tree until 3498 // we find one that is. 3499 S = getNonFieldDeclScope(S); 3500 3501 // Verify that there isn't already something declared with this name in this 3502 // scope. 3503 NamedDecl *PrevDecl = LookupName(S, Id, LookupOrdinaryName); 3504 if (PrevDecl && PrevDecl->isTemplateParameter()) { 3505 // Maybe we will complain about the shadowed template parameter. 3506 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 3507 // Just pretend that we didn't see the previous declaration. 3508 PrevDecl = 0; 3509 } 3510 3511 if (PrevDecl) { 3512 // When in C++, we may get a TagDecl with the same name; in this case the 3513 // enum constant will 'hide' the tag. 3514 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 3515 "Received TagDecl when not in C++!"); 3516 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 3517 if (isa<EnumConstantDecl>(PrevDecl)) 3518 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 3519 else 3520 Diag(IdLoc, diag::err_redefinition) << Id; 3521 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3522 if (Val) Val->Destroy(Context); 3523 return 0; 3524 } 3525 } 3526 3527 llvm::APSInt EnumVal(32); 3528 QualType EltTy; 3529 if (Val) { 3530 // Make sure to promote the operand type to int. 3531 UsualUnaryConversions(Val); 3532 3533 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 3534 SourceLocation ExpLoc; 3535 if (VerifyIntegerConstantExpression(Val, &EnumVal)) { 3536 Val->Destroy(Context); 3537 Val = 0; // Just forget about it. 3538 } else { 3539 EltTy = Val->getType(); 3540 } 3541 } 3542 3543 if (!Val) { 3544 if (LastEnumConst) { 3545 // Assign the last value + 1. 3546 EnumVal = LastEnumConst->getInitVal(); 3547 ++EnumVal; 3548 3549 // Check for overflow on increment. 3550 if (EnumVal < LastEnumConst->getInitVal()) 3551 Diag(IdLoc, diag::warn_enum_value_overflow); 3552 3553 EltTy = LastEnumConst->getType(); 3554 } else { 3555 // First value, set to zero. 3556 EltTy = Context.IntTy; 3557 EnumVal.zextOrTrunc(static_cast<uint32_t>(Context.getTypeSize(EltTy))); 3558 } 3559 } 3560 3561 EnumConstantDecl *New = 3562 EnumConstantDecl::Create(Context, TheEnumDecl, IdLoc, Id, EltTy, 3563 Val, EnumVal); 3564 3565 // Register this decl in the current scope stack. 3566 PushOnScopeChains(New, S); 3567 3568 return New; 3569} 3570 3571// FIXME: For consistency with ActOnFields(), we should have the parser 3572// pass in the source location for the left/right braces. 3573void Sema::ActOnEnumBody(SourceLocation EnumLoc, DeclTy *EnumDeclX, 3574 DeclTy **Elements, unsigned NumElements) { 3575 EnumDecl *Enum = cast<EnumDecl>(static_cast<Decl*>(EnumDeclX)); 3576 QualType EnumType = Context.getTypeDeclType(Enum); 3577 3578 // TODO: If the result value doesn't fit in an int, it must be a long or long 3579 // long value. ISO C does not support this, but GCC does as an extension, 3580 // emit a warning. 3581 unsigned IntWidth = Context.Target.getIntWidth(); 3582 3583 // Verify that all the values are okay, compute the size of the values, and 3584 // reverse the list. 3585 unsigned NumNegativeBits = 0; 3586 unsigned NumPositiveBits = 0; 3587 3588 // Keep track of whether all elements have type int. 3589 bool AllElementsInt = true; 3590 3591 for (unsigned i = 0; i != NumElements; ++i) { 3592 EnumConstantDecl *ECD = 3593 cast_or_null<EnumConstantDecl>(static_cast<Decl*>(Elements[i])); 3594 if (!ECD) continue; // Already issued a diagnostic. 3595 3596 // If the enum value doesn't fit in an int, emit an extension warning. 3597 const llvm::APSInt &InitVal = ECD->getInitVal(); 3598 assert(InitVal.getBitWidth() >= IntWidth && 3599 "Should have promoted value to int"); 3600 if (InitVal.getBitWidth() > IntWidth) { 3601 llvm::APSInt V(InitVal); 3602 V.trunc(IntWidth); 3603 V.extend(InitVal.getBitWidth()); 3604 if (V != InitVal) 3605 Diag(ECD->getLocation(), diag::ext_enum_value_not_int) 3606 << InitVal.toString(10); 3607 } 3608 3609 // Keep track of the size of positive and negative values. 3610 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 3611 NumPositiveBits = std::max(NumPositiveBits, 3612 (unsigned)InitVal.getActiveBits()); 3613 else 3614 NumNegativeBits = std::max(NumNegativeBits, 3615 (unsigned)InitVal.getMinSignedBits()); 3616 3617 // Keep track of whether every enum element has type int (very commmon). 3618 if (AllElementsInt) 3619 AllElementsInt = ECD->getType() == Context.IntTy; 3620 } 3621 3622 // Figure out the type that should be used for this enum. 3623 // FIXME: Support attribute(packed) on enums and -fshort-enums. 3624 QualType BestType; 3625 unsigned BestWidth; 3626 3627 if (NumNegativeBits) { 3628 // If there is a negative value, figure out the smallest integer type (of 3629 // int/long/longlong) that fits. 3630 if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 3631 BestType = Context.IntTy; 3632 BestWidth = IntWidth; 3633 } else { 3634 BestWidth = Context.Target.getLongWidth(); 3635 3636 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) 3637 BestType = Context.LongTy; 3638 else { 3639 BestWidth = Context.Target.getLongLongWidth(); 3640 3641 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 3642 Diag(Enum->getLocation(), diag::warn_enum_too_large); 3643 BestType = Context.LongLongTy; 3644 } 3645 } 3646 } else { 3647 // If there is no negative value, figure out which of uint, ulong, ulonglong 3648 // fits. 3649 if (NumPositiveBits <= IntWidth) { 3650 BestType = Context.UnsignedIntTy; 3651 BestWidth = IntWidth; 3652 } else if (NumPositiveBits <= 3653 (BestWidth = Context.Target.getLongWidth())) { 3654 BestType = Context.UnsignedLongTy; 3655 } else { 3656 BestWidth = Context.Target.getLongLongWidth(); 3657 assert(NumPositiveBits <= BestWidth && 3658 "How could an initializer get larger than ULL?"); 3659 BestType = Context.UnsignedLongLongTy; 3660 } 3661 } 3662 3663 // Loop over all of the enumerator constants, changing their types to match 3664 // the type of the enum if needed. 3665 for (unsigned i = 0; i != NumElements; ++i) { 3666 EnumConstantDecl *ECD = 3667 cast_or_null<EnumConstantDecl>(static_cast<Decl*>(Elements[i])); 3668 if (!ECD) continue; // Already issued a diagnostic. 3669 3670 // Standard C says the enumerators have int type, but we allow, as an 3671 // extension, the enumerators to be larger than int size. If each 3672 // enumerator value fits in an int, type it as an int, otherwise type it the 3673 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 3674 // that X has type 'int', not 'unsigned'. 3675 if (ECD->getType() == Context.IntTy) { 3676 // Make sure the init value is signed. 3677 llvm::APSInt IV = ECD->getInitVal(); 3678 IV.setIsSigned(true); 3679 ECD->setInitVal(IV); 3680 3681 if (getLangOptions().CPlusPlus) 3682 // C++ [dcl.enum]p4: Following the closing brace of an 3683 // enum-specifier, each enumerator has the type of its 3684 // enumeration. 3685 ECD->setType(EnumType); 3686 continue; // Already int type. 3687 } 3688 3689 // Determine whether the value fits into an int. 3690 llvm::APSInt InitVal = ECD->getInitVal(); 3691 bool FitsInInt; 3692 if (InitVal.isUnsigned() || !InitVal.isNegative()) 3693 FitsInInt = InitVal.getActiveBits() < IntWidth; 3694 else 3695 FitsInInt = InitVal.getMinSignedBits() <= IntWidth; 3696 3697 // If it fits into an integer type, force it. Otherwise force it to match 3698 // the enum decl type. 3699 QualType NewTy; 3700 unsigned NewWidth; 3701 bool NewSign; 3702 if (FitsInInt) { 3703 NewTy = Context.IntTy; 3704 NewWidth = IntWidth; 3705 NewSign = true; 3706 } else if (ECD->getType() == BestType) { 3707 // Already the right type! 3708 if (getLangOptions().CPlusPlus) 3709 // C++ [dcl.enum]p4: Following the closing brace of an 3710 // enum-specifier, each enumerator has the type of its 3711 // enumeration. 3712 ECD->setType(EnumType); 3713 continue; 3714 } else { 3715 NewTy = BestType; 3716 NewWidth = BestWidth; 3717 NewSign = BestType->isSignedIntegerType(); 3718 } 3719 3720 // Adjust the APSInt value. 3721 InitVal.extOrTrunc(NewWidth); 3722 InitVal.setIsSigned(NewSign); 3723 ECD->setInitVal(InitVal); 3724 3725 // Adjust the Expr initializer and type. 3726 if (ECD->getInitExpr()) 3727 ECD->setInitExpr(new (Context) ImplicitCastExpr(NewTy, ECD->getInitExpr(), 3728 /*isLvalue=*/false)); 3729 if (getLangOptions().CPlusPlus) 3730 // C++ [dcl.enum]p4: Following the closing brace of an 3731 // enum-specifier, each enumerator has the type of its 3732 // enumeration. 3733 ECD->setType(EnumType); 3734 else 3735 ECD->setType(NewTy); 3736 } 3737 3738 Enum->completeDefinition(Context, BestType); 3739} 3740 3741Sema::DeclTy *Sema::ActOnFileScopeAsmDecl(SourceLocation Loc, 3742 ExprArg expr) { 3743 StringLiteral *AsmString = cast<StringLiteral>((Expr*)expr.release()); 3744 3745 return FileScopeAsmDecl::Create(Context, CurContext, Loc, AsmString); 3746} 3747 3748