SemaDecl.cpp revision 89ef6e03665635d965ba6c92035a85b125e6c78c
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> 31 32using namespace clang; 33 34/// \brief If the identifier refers to a type name within this scope, 35/// return the declaration of that type. 36/// 37/// This routine performs ordinary name lookup of the identifier II 38/// within the given scope, with optional C++ scope specifier SS, to 39/// determine whether the name refers to a type. If so, returns the 40/// declaration corresponding to that type. Otherwise, returns NULL. 41/// 42/// If name lookup results in an ambiguity, this routine will complain 43/// and then return NULL. 44Sema::DeclTy *Sema::getTypeName(IdentifierInfo &II, SourceLocation NameLoc, 45 Scope *S, const CXXScopeSpec *SS) { 46 Decl *IIDecl = 0; 47 LookupResult Result = LookupParsedName(S, SS, &II, LookupOrdinaryName, false); 48 switch (Result.getKind()) { 49 case LookupResult::NotFound: 50 case LookupResult::FoundOverloaded: 51 return 0; 52 53 case LookupResult::AmbiguousBaseSubobjectTypes: 54 case LookupResult::AmbiguousBaseSubobjects: 55 case LookupResult::AmbiguousReference: 56 DiagnoseAmbiguousLookup(Result, DeclarationName(&II), NameLoc); 57 return 0; 58 59 case LookupResult::Found: 60 IIDecl = Result.getAsDecl(); 61 break; 62 } 63 64 if (IIDecl) { 65 if (isa<TypedefDecl>(IIDecl) || 66 isa<ObjCInterfaceDecl>(IIDecl) || 67 isa<TagDecl>(IIDecl) || 68 isa<TemplateTypeParmDecl>(IIDecl)) 69 return IIDecl; 70 } 71 return 0; 72} 73 74DeclContext *Sema::getContainingDC(DeclContext *DC) { 75 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(DC)) { 76 // A C++ out-of-line method will return to the file declaration context. 77 if (MD->isOutOfLineDefinition()) 78 return MD->getLexicalDeclContext(); 79 80 // A C++ inline method is parsed *after* the topmost class it was declared in 81 // is fully parsed (it's "complete"). 82 // The parsing of a C++ inline method happens at the declaration context of 83 // the topmost (non-nested) class it is lexically declared in. 84 assert(isa<CXXRecordDecl>(MD->getParent()) && "C++ method not in Record."); 85 DC = MD->getParent(); 86 while (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC->getLexicalParent())) 87 DC = RD; 88 89 // Return the declaration context of the topmost class the inline method is 90 // declared in. 91 return DC; 92 } 93 94 if (isa<ObjCMethodDecl>(DC)) 95 return Context.getTranslationUnitDecl(); 96 97 if (Decl *D = dyn_cast<Decl>(DC)) 98 return D->getLexicalDeclContext(); 99 100 return DC->getLexicalParent(); 101} 102 103void Sema::PushDeclContext(Scope *S, DeclContext *DC) { 104 assert(getContainingDC(DC) == CurContext && 105 "The next DeclContext should be lexically contained in the current one."); 106 CurContext = DC; 107 S->setEntity(DC); 108} 109 110void Sema::PopDeclContext() { 111 assert(CurContext && "DeclContext imbalance!"); 112 113 CurContext = getContainingDC(CurContext); 114} 115 116/// Add this decl to the scope shadowed decl chains. 117void Sema::PushOnScopeChains(NamedDecl *D, Scope *S) { 118 // Move up the scope chain until we find the nearest enclosing 119 // non-transparent context. The declaration will be introduced into this 120 // scope. 121 while (S->getEntity() && 122 ((DeclContext *)S->getEntity())->isTransparentContext()) 123 S = S->getParent(); 124 125 S->AddDecl(D); 126 127 // Add scoped declarations into their context, so that they can be 128 // found later. Declarations without a context won't be inserted 129 // into any context. 130 CurContext->addDecl(D); 131 132 // C++ [basic.scope]p4: 133 // -- exactly one declaration shall declare a class name or 134 // enumeration name that is not a typedef name and the other 135 // declarations shall all refer to the same object or 136 // enumerator, or all refer to functions and function templates; 137 // in this case the class name or enumeration name is hidden. 138 if (TagDecl *TD = dyn_cast<TagDecl>(D)) { 139 // We are pushing the name of a tag (enum or class). 140 if (CurContext->getLookupContext() 141 == TD->getDeclContext()->getLookupContext()) { 142 // We're pushing the tag into the current context, which might 143 // require some reshuffling in the identifier resolver. 144 IdentifierResolver::iterator 145 I = IdResolver.begin(TD->getDeclName()), 146 IEnd = IdResolver.end(); 147 if (I != IEnd && isDeclInScope(*I, CurContext, S)) { 148 NamedDecl *PrevDecl = *I; 149 for (; I != IEnd && isDeclInScope(*I, CurContext, S); 150 PrevDecl = *I, ++I) { 151 if (TD->declarationReplaces(*I)) { 152 // This is a redeclaration. Remove it from the chain and 153 // break out, so that we'll add in the shadowed 154 // declaration. 155 S->RemoveDecl(*I); 156 if (PrevDecl == *I) { 157 IdResolver.RemoveDecl(*I); 158 IdResolver.AddDecl(TD); 159 return; 160 } else { 161 IdResolver.RemoveDecl(*I); 162 break; 163 } 164 } 165 } 166 167 // There is already a declaration with the same name in the same 168 // scope, which is not a tag declaration. It must be found 169 // before we find the new declaration, so insert the new 170 // declaration at the end of the chain. 171 IdResolver.AddShadowedDecl(TD, PrevDecl); 172 173 return; 174 } 175 } 176 } else if (getLangOptions().CPlusPlus && isa<FunctionDecl>(D)) { 177 // We are pushing the name of a function, which might be an 178 // overloaded name. 179 FunctionDecl *FD = cast<FunctionDecl>(D); 180 IdentifierResolver::iterator Redecl 181 = std::find_if(IdResolver.begin(FD->getDeclName()), 182 IdResolver.end(), 183 std::bind1st(std::mem_fun(&NamedDecl::declarationReplaces), 184 FD)); 185 if (Redecl != IdResolver.end()) { 186 // There is already a declaration of a function on our 187 // IdResolver chain. Replace it with this declaration. 188 S->RemoveDecl(*Redecl); 189 IdResolver.RemoveDecl(*Redecl); 190 } 191 } 192 193 IdResolver.AddDecl(D); 194} 195 196void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) { 197 if (S->decl_empty()) return; 198 assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) && 199 "Scope shouldn't contain decls!"); 200 201 for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end(); 202 I != E; ++I) { 203 Decl *TmpD = static_cast<Decl*>(*I); 204 assert(TmpD && "This decl didn't get pushed??"); 205 206 assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?"); 207 NamedDecl *D = cast<NamedDecl>(TmpD); 208 209 if (!D->getDeclName()) continue; 210 211 // Remove this name from our lexical scope. 212 IdResolver.RemoveDecl(D); 213 } 214} 215 216/// getObjCInterfaceDecl - Look up a for a class declaration in the scope. 217/// return 0 if one not found. 218ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *Id) { 219 // The third "scope" argument is 0 since we aren't enabling lazy built-in 220 // creation from this context. 221 NamedDecl *IDecl = LookupName(TUScope, Id, LookupOrdinaryName); 222 223 return dyn_cast_or_null<ObjCInterfaceDecl>(IDecl); 224} 225 226/// getNonFieldDeclScope - Retrieves the innermost scope, starting 227/// from S, where a non-field would be declared. This routine copes 228/// with the difference between C and C++ scoping rules in structs and 229/// unions. For example, the following code is well-formed in C but 230/// ill-formed in C++: 231/// @code 232/// struct S6 { 233/// enum { BAR } e; 234/// }; 235/// 236/// void test_S6() { 237/// struct S6 a; 238/// a.e = BAR; 239/// } 240/// @endcode 241/// For the declaration of BAR, this routine will return a different 242/// scope. The scope S will be the scope of the unnamed enumeration 243/// within S6. In C++, this routine will return the scope associated 244/// with S6, because the enumeration's scope is a transparent 245/// context but structures can contain non-field names. In C, this 246/// routine will return the translation unit scope, since the 247/// enumeration's scope is a transparent context and structures cannot 248/// contain non-field names. 249Scope *Sema::getNonFieldDeclScope(Scope *S) { 250 while (((S->getFlags() & Scope::DeclScope) == 0) || 251 (S->getEntity() && 252 ((DeclContext *)S->getEntity())->isTransparentContext()) || 253 (S->isClassScope() && !getLangOptions().CPlusPlus)) 254 S = S->getParent(); 255 return S; 256} 257 258void Sema::InitBuiltinVaListType() { 259 if (!Context.getBuiltinVaListType().isNull()) 260 return; 261 262 IdentifierInfo *VaIdent = &Context.Idents.get("__builtin_va_list"); 263 NamedDecl *VaDecl = LookupName(TUScope, VaIdent, LookupOrdinaryName); 264 TypedefDecl *VaTypedef = cast<TypedefDecl>(VaDecl); 265 Context.setBuiltinVaListType(Context.getTypedefType(VaTypedef)); 266} 267 268/// LazilyCreateBuiltin - The specified Builtin-ID was first used at file scope. 269/// lazily create a decl for it. 270NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid, 271 Scope *S) { 272 Builtin::ID BID = (Builtin::ID)bid; 273 274 if (Context.BuiltinInfo.hasVAListUse(BID)) 275 InitBuiltinVaListType(); 276 277 QualType R = Context.BuiltinInfo.GetBuiltinType(BID, Context); 278 FunctionDecl *New = FunctionDecl::Create(Context, 279 Context.getTranslationUnitDecl(), 280 SourceLocation(), II, R, 281 FunctionDecl::Extern, false); 282 283 // Create Decl objects for each parameter, adding them to the 284 // FunctionDecl. 285 if (FunctionTypeProto *FT = dyn_cast<FunctionTypeProto>(R)) { 286 llvm::SmallVector<ParmVarDecl*, 16> Params; 287 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) 288 Params.push_back(ParmVarDecl::Create(Context, New, SourceLocation(), 0, 289 FT->getArgType(i), VarDecl::None, 0)); 290 New->setParams(Context, &Params[0], Params.size()); 291 } 292 293 294 295 // TUScope is the translation-unit scope to insert this function into. 296 // FIXME: This is hideous. We need to teach PushOnScopeChains to 297 // relate Scopes to DeclContexts, and probably eliminate CurContext 298 // entirely, but we're not there yet. 299 DeclContext *SavedContext = CurContext; 300 CurContext = Context.getTranslationUnitDecl(); 301 PushOnScopeChains(New, TUScope); 302 CurContext = SavedContext; 303 return New; 304} 305 306/// GetStdNamespace - This method gets the C++ "std" namespace. This is where 307/// everything from the standard library is defined. 308NamespaceDecl *Sema::GetStdNamespace() { 309 if (!StdNamespace) { 310 IdentifierInfo *StdIdent = &PP.getIdentifierTable().get("std"); 311 DeclContext *Global = Context.getTranslationUnitDecl(); 312 Decl *Std = LookupQualifiedName(Global, StdIdent, LookupNamespaceName); 313 StdNamespace = dyn_cast_or_null<NamespaceDecl>(Std); 314 } 315 return StdNamespace; 316} 317 318/// MergeTypeDefDecl - We just parsed a typedef 'New' which has the same name 319/// and scope as a previous declaration 'Old'. Figure out how to resolve this 320/// situation, merging decls or emitting diagnostics as appropriate. 321/// 322TypedefDecl *Sema::MergeTypeDefDecl(TypedefDecl *New, Decl *OldD) { 323 bool objc_types = false; 324 // Allow multiple definitions for ObjC built-in typedefs. 325 // FIXME: Verify the underlying types are equivalent! 326 if (getLangOptions().ObjC1) { 327 const IdentifierInfo *TypeID = New->getIdentifier(); 328 switch (TypeID->getLength()) { 329 default: break; 330 case 2: 331 if (!TypeID->isStr("id")) 332 break; 333 Context.setObjCIdType(New); 334 objc_types = true; 335 break; 336 case 5: 337 if (!TypeID->isStr("Class")) 338 break; 339 Context.setObjCClassType(New); 340 objc_types = true; 341 return New; 342 case 3: 343 if (!TypeID->isStr("SEL")) 344 break; 345 Context.setObjCSelType(New); 346 objc_types = true; 347 return New; 348 case 8: 349 if (!TypeID->isStr("Protocol")) 350 break; 351 Context.setObjCProtoType(New->getUnderlyingType()); 352 objc_types = true; 353 return New; 354 } 355 // Fall through - the typedef name was not a builtin type. 356 } 357 // Verify the old decl was also a type. 358 TypeDecl *Old = dyn_cast<TypeDecl>(OldD); 359 if (!Old) { 360 Diag(New->getLocation(), diag::err_redefinition_different_kind) 361 << New->getDeclName(); 362 if (!objc_types) 363 Diag(OldD->getLocation(), diag::note_previous_definition); 364 return New; 365 } 366 367 // Determine the "old" type we'll use for checking and diagnostics. 368 QualType OldType; 369 if (TypedefDecl *OldTypedef = dyn_cast<TypedefDecl>(Old)) 370 OldType = OldTypedef->getUnderlyingType(); 371 else 372 OldType = Context.getTypeDeclType(Old); 373 374 // If the typedef types are not identical, reject them in all languages and 375 // with any extensions enabled. 376 377 if (OldType != New->getUnderlyingType() && 378 Context.getCanonicalType(OldType) != 379 Context.getCanonicalType(New->getUnderlyingType())) { 380 Diag(New->getLocation(), diag::err_redefinition_different_typedef) 381 << New->getUnderlyingType() << OldType; 382 if (!objc_types) 383 Diag(Old->getLocation(), diag::note_previous_definition); 384 return New; 385 } 386 if (objc_types) return New; 387 if (getLangOptions().Microsoft) return New; 388 389 // C++ [dcl.typedef]p2: 390 // In a given non-class scope, a typedef specifier can be used to 391 // redefine the name of any type declared in that scope to refer 392 // to the type to which it already refers. 393 if (getLangOptions().CPlusPlus && !isa<CXXRecordDecl>(CurContext)) 394 return New; 395 396 // In C, redeclaration of a type is a constraint violation (6.7.2.3p1). 397 // Apparently GCC, Intel, and Sun all silently ignore the redeclaration if 398 // *either* declaration is in a system header. The code below implements 399 // this adhoc compatibility rule. FIXME: The following code will not 400 // work properly when compiling ".i" files (containing preprocessed output). 401 if (PP.getDiagnostics().getSuppressSystemWarnings()) { 402 SourceManager &SrcMgr = Context.getSourceManager(); 403 if (SrcMgr.isInSystemHeader(Old->getLocation())) 404 return New; 405 if (SrcMgr.isInSystemHeader(New->getLocation())) 406 return New; 407 } 408 409 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 410 Diag(Old->getLocation(), diag::note_previous_definition); 411 return New; 412} 413 414/// DeclhasAttr - returns true if decl Declaration already has the target 415/// attribute. 416static bool DeclHasAttr(const Decl *decl, const Attr *target) { 417 for (const Attr *attr = decl->getAttrs(); attr; attr = attr->getNext()) 418 if (attr->getKind() == target->getKind()) 419 return true; 420 421 return false; 422} 423 424/// MergeAttributes - append attributes from the Old decl to the New one. 425static void MergeAttributes(Decl *New, Decl *Old) { 426 Attr *attr = const_cast<Attr*>(Old->getAttrs()), *tmp; 427 428 while (attr) { 429 tmp = attr; 430 attr = attr->getNext(); 431 432 if (!DeclHasAttr(New, tmp)) { 433 tmp->setInherited(true); 434 New->addAttr(tmp); 435 } else { 436 tmp->setNext(0); 437 delete(tmp); 438 } 439 } 440 441 Old->invalidateAttrs(); 442} 443 444/// MergeFunctionDecl - We just parsed a function 'New' from 445/// declarator D which has the same name and scope as a previous 446/// declaration 'Old'. Figure out how to resolve this situation, 447/// merging decls or emitting diagnostics as appropriate. 448/// Redeclaration will be set true if this New is a redeclaration OldD. 449/// 450/// In C++, New and Old must be declarations that are not 451/// overloaded. Use IsOverload to determine whether New and Old are 452/// overloaded, and to select the Old declaration that New should be 453/// merged with. 454FunctionDecl * 455Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD, bool &Redeclaration) { 456 assert(!isa<OverloadedFunctionDecl>(OldD) && 457 "Cannot merge with an overloaded function declaration"); 458 459 Redeclaration = false; 460 // Verify the old decl was also a function. 461 FunctionDecl *Old = dyn_cast<FunctionDecl>(OldD); 462 if (!Old) { 463 Diag(New->getLocation(), diag::err_redefinition_different_kind) 464 << New->getDeclName(); 465 Diag(OldD->getLocation(), diag::note_previous_definition); 466 return New; 467 } 468 469 // Determine whether the previous declaration was a definition, 470 // implicit declaration, or a declaration. 471 diag::kind PrevDiag; 472 if (Old->isThisDeclarationADefinition()) 473 PrevDiag = diag::note_previous_definition; 474 else if (Old->isImplicit()) 475 PrevDiag = diag::note_previous_implicit_declaration; 476 else 477 PrevDiag = diag::note_previous_declaration; 478 479 QualType OldQType = Context.getCanonicalType(Old->getType()); 480 QualType NewQType = Context.getCanonicalType(New->getType()); 481 482 if (getLangOptions().CPlusPlus) { 483 // (C++98 13.1p2): 484 // Certain function declarations cannot be overloaded: 485 // -- Function declarations that differ only in the return type 486 // cannot be overloaded. 487 QualType OldReturnType 488 = cast<FunctionType>(OldQType.getTypePtr())->getResultType(); 489 QualType NewReturnType 490 = cast<FunctionType>(NewQType.getTypePtr())->getResultType(); 491 if (OldReturnType != NewReturnType) { 492 Diag(New->getLocation(), diag::err_ovl_diff_return_type); 493 Diag(Old->getLocation(), PrevDiag); 494 Redeclaration = true; 495 return New; 496 } 497 498 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 499 const CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 500 if (OldMethod && NewMethod) { 501 // -- Member function declarations with the same name and the 502 // same parameter types cannot be overloaded if any of them 503 // is a static member function declaration. 504 if (OldMethod->isStatic() || NewMethod->isStatic()) { 505 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 506 Diag(Old->getLocation(), PrevDiag); 507 return New; 508 } 509 510 // C++ [class.mem]p1: 511 // [...] A member shall not be declared twice in the 512 // member-specification, except that a nested class or member 513 // class template can be declared and then later defined. 514 if (OldMethod->getLexicalDeclContext() == 515 NewMethod->getLexicalDeclContext()) { 516 unsigned NewDiag; 517 if (isa<CXXConstructorDecl>(OldMethod)) 518 NewDiag = diag::err_constructor_redeclared; 519 else if (isa<CXXDestructorDecl>(NewMethod)) 520 NewDiag = diag::err_destructor_redeclared; 521 else if (isa<CXXConversionDecl>(NewMethod)) 522 NewDiag = diag::err_conv_function_redeclared; 523 else 524 NewDiag = diag::err_member_redeclared; 525 526 Diag(New->getLocation(), NewDiag); 527 Diag(Old->getLocation(), PrevDiag); 528 } 529 } 530 531 // (C++98 8.3.5p3): 532 // All declarations for a function shall agree exactly in both the 533 // return type and the parameter-type-list. 534 if (OldQType == NewQType) { 535 // We have a redeclaration. 536 MergeAttributes(New, Old); 537 Redeclaration = true; 538 return MergeCXXFunctionDecl(New, Old); 539 } 540 541 // Fall through for conflicting redeclarations and redefinitions. 542 } 543 544 // C: Function types need to be compatible, not identical. This handles 545 // duplicate function decls like "void f(int); void f(enum X);" properly. 546 if (!getLangOptions().CPlusPlus && 547 Context.typesAreCompatible(OldQType, NewQType)) { 548 MergeAttributes(New, Old); 549 Redeclaration = true; 550 return New; 551 } 552 553 // A function that has already been declared has been redeclared or defined 554 // with a different type- show appropriate diagnostic 555 556 // TODO: CHECK FOR CONFLICTS, multiple decls with same name in one scope. 557 // TODO: This is totally simplistic. It should handle merging functions 558 // together etc, merging extern int X; int X; ... 559 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 560 Diag(Old->getLocation(), PrevDiag); 561 return New; 562} 563 564/// Predicate for C "tentative" external object definitions (C99 6.9.2). 565static bool isTentativeDefinition(VarDecl *VD) { 566 if (VD->isFileVarDecl()) 567 return (!VD->getInit() && 568 (VD->getStorageClass() == VarDecl::None || 569 VD->getStorageClass() == VarDecl::Static)); 570 return false; 571} 572 573/// CheckForFileScopedRedefinitions - Make sure we forgo redefinition errors 574/// when dealing with C "tentative" external object definitions (C99 6.9.2). 575void Sema::CheckForFileScopedRedefinitions(Scope *S, VarDecl *VD) { 576 bool VDIsTentative = isTentativeDefinition(VD); 577 bool VDIsIncompleteArray = VD->getType()->isIncompleteArrayType(); 578 579 // FIXME: I don't think this will actually see all of the 580 // redefinitions. Can't we check this property on-the-fly? 581 for (IdentifierResolver::iterator I = IdResolver.begin(VD->getIdentifier()), 582 E = IdResolver.end(); 583 I != E; ++I) { 584 if (*I != VD && isDeclInScope(*I, VD->getDeclContext(), S)) { 585 VarDecl *OldDecl = dyn_cast<VarDecl>(*I); 586 587 // Handle the following case: 588 // int a[10]; 589 // int a[]; - the code below makes sure we set the correct type. 590 // int a[11]; - this is an error, size isn't 10. 591 if (OldDecl && VDIsTentative && VDIsIncompleteArray && 592 OldDecl->getType()->isConstantArrayType()) 593 VD->setType(OldDecl->getType()); 594 595 // Check for "tentative" definitions. We can't accomplish this in 596 // MergeVarDecl since the initializer hasn't been attached. 597 if (!OldDecl || isTentativeDefinition(OldDecl) || VDIsTentative) 598 continue; 599 600 // Handle __private_extern__ just like extern. 601 if (OldDecl->getStorageClass() != VarDecl::Extern && 602 OldDecl->getStorageClass() != VarDecl::PrivateExtern && 603 VD->getStorageClass() != VarDecl::Extern && 604 VD->getStorageClass() != VarDecl::PrivateExtern) { 605 Diag(VD->getLocation(), diag::err_redefinition) << VD->getDeclName(); 606 Diag(OldDecl->getLocation(), diag::note_previous_definition); 607 // One redefinition error is enough. 608 break; 609 } 610 } 611 } 612} 613 614/// MergeVarDecl - We just parsed a variable 'New' which has the same name 615/// and scope as a previous declaration 'Old'. Figure out how to resolve this 616/// situation, merging decls or emitting diagnostics as appropriate. 617/// 618/// Tentative definition rules (C99 6.9.2p2) are checked by 619/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 620/// definitions here, since the initializer hasn't been attached. 621/// 622VarDecl *Sema::MergeVarDecl(VarDecl *New, Decl *OldD) { 623 // Verify the old decl was also a variable. 624 VarDecl *Old = dyn_cast<VarDecl>(OldD); 625 if (!Old) { 626 Diag(New->getLocation(), diag::err_redefinition_different_kind) 627 << New->getDeclName(); 628 Diag(OldD->getLocation(), diag::note_previous_definition); 629 return New; 630 } 631 632 MergeAttributes(New, Old); 633 634 // Merge the types 635 QualType MergedT = Context.mergeTypes(New->getType(), Old->getType()); 636 if (MergedT.isNull()) { 637 Diag(New->getLocation(), diag::err_redefinition_different_type) 638 << New->getDeclName(); 639 Diag(Old->getLocation(), diag::note_previous_definition); 640 return New; 641 } 642 New->setType(MergedT); 643 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 644 if (New->getStorageClass() == VarDecl::Static && 645 (Old->getStorageClass() == VarDecl::None || 646 Old->getStorageClass() == VarDecl::Extern)) { 647 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 648 Diag(Old->getLocation(), diag::note_previous_definition); 649 return New; 650 } 651 // C99 6.2.2p4: Check if we have a non-static decl followed by a static. 652 if (New->getStorageClass() != VarDecl::Static && 653 Old->getStorageClass() == VarDecl::Static) { 654 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 655 Diag(Old->getLocation(), diag::note_previous_definition); 656 return New; 657 } 658 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 659 if (New->getStorageClass() != VarDecl::Extern && !New->isFileVarDecl()) { 660 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 661 Diag(Old->getLocation(), diag::note_previous_definition); 662 } 663 return New; 664} 665 666/// CheckParmsForFunctionDef - Check that the parameters of the given 667/// function are appropriate for the definition of a function. This 668/// takes care of any checks that cannot be performed on the 669/// declaration itself, e.g., that the types of each of the function 670/// parameters are complete. 671bool Sema::CheckParmsForFunctionDef(FunctionDecl *FD) { 672 bool HasInvalidParm = false; 673 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 674 ParmVarDecl *Param = FD->getParamDecl(p); 675 676 // C99 6.7.5.3p4: the parameters in a parameter type list in a 677 // function declarator that is part of a function definition of 678 // that function shall not have incomplete type. 679 if (!Param->isInvalidDecl() && 680 DiagnoseIncompleteType(Param->getLocation(), Param->getType(), 681 diag::err_typecheck_decl_incomplete_type)) { 682 Param->setInvalidDecl(); 683 HasInvalidParm = true; 684 } 685 686 // C99 6.9.1p5: If the declarator includes a parameter type list, the 687 // declaration of each parameter shall include an identifier. 688 if (Param->getIdentifier() == 0 && !getLangOptions().CPlusPlus) 689 Diag(Param->getLocation(), diag::err_parameter_name_omitted); 690 } 691 692 return HasInvalidParm; 693} 694 695/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 696/// no declarator (e.g. "struct foo;") is parsed. 697Sema::DeclTy *Sema::ParsedFreeStandingDeclSpec(Scope *S, DeclSpec &DS) { 698 TagDecl *Tag 699 = dyn_cast_or_null<TagDecl>(static_cast<Decl *>(DS.getTypeRep())); 700 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 701 if (!Record->getDeclName() && Record->isDefinition() && 702 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) 703 return BuildAnonymousStructOrUnion(S, DS, Record); 704 705 // Microsoft allows unnamed struct/union fields. Don't complain 706 // about them. 707 // FIXME: Should we support Microsoft's extensions in this area? 708 if (Record->getDeclName() && getLangOptions().Microsoft) 709 return Tag; 710 } 711 712 if (!DS.isMissingDeclaratorOk() && 713 DS.getTypeSpecType() != DeclSpec::TST_error) { 714 // Warn about typedefs of enums without names, since this is an 715 // extension in both Microsoft an GNU. 716 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 717 Tag && isa<EnumDecl>(Tag)) { 718 Diag(DS.getSourceRange().getBegin(), diag::ext_typedef_without_a_name) 719 << DS.getSourceRange(); 720 return Tag; 721 } 722 723 Diag(DS.getSourceRange().getBegin(), diag::err_no_declarators) 724 << DS.getSourceRange(); 725 return 0; 726 } 727 728 return Tag; 729} 730 731/// InjectAnonymousStructOrUnionMembers - Inject the members of the 732/// anonymous struct or union AnonRecord into the owning context Owner 733/// and scope S. This routine will be invoked just after we realize 734/// that an unnamed union or struct is actually an anonymous union or 735/// struct, e.g., 736/// 737/// @code 738/// union { 739/// int i; 740/// float f; 741/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 742/// // f into the surrounding scope.x 743/// @endcode 744/// 745/// This routine is recursive, injecting the names of nested anonymous 746/// structs/unions into the owning context and scope as well. 747bool Sema::InjectAnonymousStructOrUnionMembers(Scope *S, DeclContext *Owner, 748 RecordDecl *AnonRecord) { 749 bool Invalid = false; 750 for (RecordDecl::field_iterator F = AnonRecord->field_begin(), 751 FEnd = AnonRecord->field_end(); 752 F != FEnd; ++F) { 753 if ((*F)->getDeclName()) { 754 NamedDecl *PrevDecl = LookupQualifiedName(Owner, (*F)->getDeclName(), 755 LookupOrdinaryName, true); 756 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 757 // C++ [class.union]p2: 758 // The names of the members of an anonymous union shall be 759 // distinct from the names of any other entity in the 760 // scope in which the anonymous union is declared. 761 unsigned diagKind 762 = AnonRecord->isUnion()? diag::err_anonymous_union_member_redecl 763 : diag::err_anonymous_struct_member_redecl; 764 Diag((*F)->getLocation(), diagKind) 765 << (*F)->getDeclName(); 766 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 767 Invalid = true; 768 } else { 769 // C++ [class.union]p2: 770 // For the purpose of name lookup, after the anonymous union 771 // definition, the members of the anonymous union are 772 // considered to have been defined in the scope in which the 773 // anonymous union is declared. 774 Owner->makeDeclVisibleInContext(*F); 775 S->AddDecl(*F); 776 IdResolver.AddDecl(*F); 777 } 778 } else if (const RecordType *InnerRecordType 779 = (*F)->getType()->getAsRecordType()) { 780 RecordDecl *InnerRecord = InnerRecordType->getDecl(); 781 if (InnerRecord->isAnonymousStructOrUnion()) 782 Invalid = Invalid || 783 InjectAnonymousStructOrUnionMembers(S, Owner, InnerRecord); 784 } 785 } 786 787 return Invalid; 788} 789 790/// ActOnAnonymousStructOrUnion - Handle the declaration of an 791/// anonymous structure or union. Anonymous unions are a C++ feature 792/// (C++ [class.union]) and a GNU C extension; anonymous structures 793/// are a GNU C and GNU C++ extension. 794Sema::DeclTy *Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 795 RecordDecl *Record) { 796 DeclContext *Owner = Record->getDeclContext(); 797 798 // Diagnose whether this anonymous struct/union is an extension. 799 if (Record->isUnion() && !getLangOptions().CPlusPlus) 800 Diag(Record->getLocation(), diag::ext_anonymous_union); 801 else if (!Record->isUnion()) 802 Diag(Record->getLocation(), diag::ext_anonymous_struct); 803 804 // C and C++ require different kinds of checks for anonymous 805 // structs/unions. 806 bool Invalid = false; 807 if (getLangOptions().CPlusPlus) { 808 const char* PrevSpec = 0; 809 // C++ [class.union]p3: 810 // Anonymous unions declared in a named namespace or in the 811 // global namespace shall be declared static. 812 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 813 (isa<TranslationUnitDecl>(Owner) || 814 (isa<NamespaceDecl>(Owner) && 815 cast<NamespaceDecl>(Owner)->getDeclName()))) { 816 Diag(Record->getLocation(), diag::err_anonymous_union_not_static); 817 Invalid = true; 818 819 // Recover by adding 'static'. 820 DS.SetStorageClassSpec(DeclSpec::SCS_static, SourceLocation(), PrevSpec); 821 } 822 // C++ [class.union]p3: 823 // A storage class is not allowed in a declaration of an 824 // anonymous union in a class scope. 825 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 826 isa<RecordDecl>(Owner)) { 827 Diag(DS.getStorageClassSpecLoc(), 828 diag::err_anonymous_union_with_storage_spec); 829 Invalid = true; 830 831 // Recover by removing the storage specifier. 832 DS.SetStorageClassSpec(DeclSpec::SCS_unspecified, SourceLocation(), 833 PrevSpec); 834 } 835 836 // C++ [class.union]p2: 837 // The member-specification of an anonymous union shall only 838 // define non-static data members. [Note: nested types and 839 // functions cannot be declared within an anonymous union. ] 840 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 841 MemEnd = Record->decls_end(); 842 Mem != MemEnd; ++Mem) { 843 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 844 // C++ [class.union]p3: 845 // An anonymous union shall not have private or protected 846 // members (clause 11). 847 if (FD->getAccess() == AS_protected || FD->getAccess() == AS_private) { 848 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 849 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 850 Invalid = true; 851 } 852 } else if ((*Mem)->isImplicit()) { 853 // Any implicit members are fine. 854 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 855 // This is a type that showed up in an 856 // elaborated-type-specifier inside the anonymous struct or 857 // union, but which actually declares a type outside of the 858 // anonymous struct or union. It's okay. 859 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 860 if (!MemRecord->isAnonymousStructOrUnion() && 861 MemRecord->getDeclName()) { 862 // This is a nested type declaration. 863 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 864 << (int)Record->isUnion(); 865 Invalid = true; 866 } 867 } else { 868 // We have something that isn't a non-static data 869 // member. Complain about it. 870 unsigned DK = diag::err_anonymous_record_bad_member; 871 if (isa<TypeDecl>(*Mem)) 872 DK = diag::err_anonymous_record_with_type; 873 else if (isa<FunctionDecl>(*Mem)) 874 DK = diag::err_anonymous_record_with_function; 875 else if (isa<VarDecl>(*Mem)) 876 DK = diag::err_anonymous_record_with_static; 877 Diag((*Mem)->getLocation(), DK) 878 << (int)Record->isUnion(); 879 Invalid = true; 880 } 881 } 882 } else { 883 // FIXME: Check GNU C semantics 884 if (Record->isUnion() && !Owner->isRecord()) { 885 Diag(Record->getLocation(), diag::err_anonymous_union_not_member) 886 << (int)getLangOptions().CPlusPlus; 887 Invalid = true; 888 } 889 } 890 891 if (!Record->isUnion() && !Owner->isRecord()) { 892 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 893 << (int)getLangOptions().CPlusPlus; 894 Invalid = true; 895 } 896 897 // Create a declaration for this anonymous struct/union. 898 NamedDecl *Anon = 0; 899 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 900 Anon = FieldDecl::Create(Context, OwningClass, Record->getLocation(), 901 /*IdentifierInfo=*/0, 902 Context.getTypeDeclType(Record), 903 /*BitWidth=*/0, /*Mutable=*/false); 904 Anon->setAccess(AS_public); 905 if (getLangOptions().CPlusPlus) 906 FieldCollector->Add(cast<FieldDecl>(Anon)); 907 } else { 908 VarDecl::StorageClass SC; 909 switch (DS.getStorageClassSpec()) { 910 default: assert(0 && "Unknown storage class!"); 911 case DeclSpec::SCS_unspecified: SC = VarDecl::None; break; 912 case DeclSpec::SCS_extern: SC = VarDecl::Extern; break; 913 case DeclSpec::SCS_static: SC = VarDecl::Static; break; 914 case DeclSpec::SCS_auto: SC = VarDecl::Auto; break; 915 case DeclSpec::SCS_register: SC = VarDecl::Register; break; 916 case DeclSpec::SCS_private_extern: SC = VarDecl::PrivateExtern; break; 917 case DeclSpec::SCS_mutable: 918 // mutable can only appear on non-static class members, so it's always 919 // an error here 920 Diag(Record->getLocation(), diag::err_mutable_nonmember); 921 Invalid = true; 922 SC = VarDecl::None; 923 break; 924 } 925 926 Anon = VarDecl::Create(Context, Owner, Record->getLocation(), 927 /*IdentifierInfo=*/0, 928 Context.getTypeDeclType(Record), 929 SC, DS.getSourceRange().getBegin()); 930 } 931 Anon->setImplicit(); 932 933 // Add the anonymous struct/union object to the current 934 // context. We'll be referencing this object when we refer to one of 935 // its members. 936 Owner->addDecl(Anon); 937 938 // Inject the members of the anonymous struct/union into the owning 939 // context and into the identifier resolver chain for name lookup 940 // purposes. 941 if (InjectAnonymousStructOrUnionMembers(S, Owner, Record)) 942 Invalid = true; 943 944 // Mark this as an anonymous struct/union type. Note that we do not 945 // do this until after we have already checked and injected the 946 // members of this anonymous struct/union type, because otherwise 947 // the members could be injected twice: once by DeclContext when it 948 // builds its lookup table, and once by 949 // InjectAnonymousStructOrUnionMembers. 950 Record->setAnonymousStructOrUnion(true); 951 952 if (Invalid) 953 Anon->setInvalidDecl(); 954 955 return Anon; 956} 957 958bool Sema::CheckSingleInitializer(Expr *&Init, QualType DeclType, 959 bool DirectInit) { 960 // Get the type before calling CheckSingleAssignmentConstraints(), since 961 // it can promote the expression. 962 QualType InitType = Init->getType(); 963 964 if (getLangOptions().CPlusPlus) { 965 // FIXME: I dislike this error message. A lot. 966 if (PerformImplicitConversion(Init, DeclType, "initializing", DirectInit)) 967 return Diag(Init->getSourceRange().getBegin(), 968 diag::err_typecheck_convert_incompatible) 969 << DeclType << Init->getType() << "initializing" 970 << Init->getSourceRange(); 971 972 return false; 973 } 974 975 AssignConvertType ConvTy = CheckSingleAssignmentConstraints(DeclType, Init); 976 return DiagnoseAssignmentResult(ConvTy, Init->getLocStart(), DeclType, 977 InitType, Init, "initializing"); 978} 979 980bool Sema::CheckStringLiteralInit(StringLiteral *strLiteral, QualType &DeclT) { 981 const ArrayType *AT = Context.getAsArrayType(DeclT); 982 983 if (const IncompleteArrayType *IAT = dyn_cast<IncompleteArrayType>(AT)) { 984 // C99 6.7.8p14. We have an array of character type with unknown size 985 // being initialized to a string literal. 986 llvm::APSInt ConstVal(32); 987 ConstVal = strLiteral->getByteLength() + 1; 988 // Return a new array type (C99 6.7.8p22). 989 DeclT = Context.getConstantArrayType(IAT->getElementType(), ConstVal, 990 ArrayType::Normal, 0); 991 } else { 992 const ConstantArrayType *CAT = cast<ConstantArrayType>(AT); 993 // C99 6.7.8p14. We have an array of character type with known size. 994 // FIXME: Avoid truncation for 64-bit length strings. 995 if (strLiteral->getByteLength() > (unsigned)CAT->getSize().getZExtValue()) 996 Diag(strLiteral->getSourceRange().getBegin(), 997 diag::warn_initializer_string_for_char_array_too_long) 998 << strLiteral->getSourceRange(); 999 } 1000 // Set type from "char *" to "constant array of char". 1001 strLiteral->setType(DeclT); 1002 // For now, we always return false (meaning success). 1003 return false; 1004} 1005 1006StringLiteral *Sema::IsStringLiteralInit(Expr *Init, QualType DeclType) { 1007 const ArrayType *AT = Context.getAsArrayType(DeclType); 1008 if (AT && AT->getElementType()->isCharType()) { 1009 return dyn_cast<StringLiteral>(Init->IgnoreParens()); 1010 } 1011 return 0; 1012} 1013 1014bool Sema::CheckInitializerTypes(Expr *&Init, QualType &DeclType, 1015 SourceLocation InitLoc, 1016 DeclarationName InitEntity, 1017 bool DirectInit) { 1018 if (DeclType->isDependentType() || Init->isTypeDependent()) 1019 return false; 1020 1021 // C++ [dcl.init.ref]p1: 1022 // A variable declared to be a T&, that is "reference to type T" 1023 // (8.3.2), shall be initialized by an object, or function, of 1024 // type T or by an object that can be converted into a T. 1025 if (DeclType->isReferenceType()) 1026 return CheckReferenceInit(Init, DeclType, 0, false, DirectInit); 1027 1028 // C99 6.7.8p3: The type of the entity to be initialized shall be an array 1029 // of unknown size ("[]") or an object type that is not a variable array type. 1030 if (const VariableArrayType *VAT = Context.getAsVariableArrayType(DeclType)) 1031 return Diag(InitLoc, diag::err_variable_object_no_init) 1032 << VAT->getSizeExpr()->getSourceRange(); 1033 1034 InitListExpr *InitList = dyn_cast<InitListExpr>(Init); 1035 if (!InitList) { 1036 // FIXME: Handle wide strings 1037 if (StringLiteral *strLiteral = IsStringLiteralInit(Init, DeclType)) 1038 return CheckStringLiteralInit(strLiteral, DeclType); 1039 1040 // C++ [dcl.init]p14: 1041 // -- If the destination type is a (possibly cv-qualified) class 1042 // type: 1043 if (getLangOptions().CPlusPlus && DeclType->isRecordType()) { 1044 QualType DeclTypeC = Context.getCanonicalType(DeclType); 1045 QualType InitTypeC = Context.getCanonicalType(Init->getType()); 1046 1047 // -- If the initialization is direct-initialization, or if it is 1048 // copy-initialization where the cv-unqualified version of the 1049 // source type is the same class as, or a derived class of, the 1050 // class of the destination, constructors are considered. 1051 if ((DeclTypeC.getUnqualifiedType() == InitTypeC.getUnqualifiedType()) || 1052 IsDerivedFrom(InitTypeC, DeclTypeC)) { 1053 CXXConstructorDecl *Constructor 1054 = PerformInitializationByConstructor(DeclType, &Init, 1, 1055 InitLoc, Init->getSourceRange(), 1056 InitEntity, 1057 DirectInit? IK_Direct : IK_Copy); 1058 return Constructor == 0; 1059 } 1060 1061 // -- Otherwise (i.e., for the remaining copy-initialization 1062 // cases), user-defined conversion sequences that can 1063 // convert from the source type to the destination type or 1064 // (when a conversion function is used) to a derived class 1065 // thereof are enumerated as described in 13.3.1.4, and the 1066 // best one is chosen through overload resolution 1067 // (13.3). If the conversion cannot be done or is 1068 // ambiguous, the initialization is ill-formed. The 1069 // function selected is called with the initializer 1070 // expression as its argument; if the function is a 1071 // constructor, the call initializes a temporary of the 1072 // destination type. 1073 // FIXME: We're pretending to do copy elision here; return to 1074 // this when we have ASTs for such things. 1075 if (!PerformImplicitConversion(Init, DeclType, "initializing")) 1076 return false; 1077 1078 if (InitEntity) 1079 return Diag(InitLoc, diag::err_cannot_initialize_decl) 1080 << InitEntity << (int)(Init->isLvalue(Context) == Expr::LV_Valid) 1081 << Init->getType() << Init->getSourceRange(); 1082 else 1083 return Diag(InitLoc, diag::err_cannot_initialize_decl_noname) 1084 << DeclType << (int)(Init->isLvalue(Context) == Expr::LV_Valid) 1085 << Init->getType() << Init->getSourceRange(); 1086 } 1087 1088 // C99 6.7.8p16. 1089 if (DeclType->isArrayType()) 1090 return Diag(Init->getLocStart(), diag::err_array_init_list_required) 1091 << Init->getSourceRange(); 1092 1093 return CheckSingleInitializer(Init, DeclType, DirectInit); 1094 } 1095 1096 bool hadError = CheckInitList(InitList, DeclType); 1097 Init = InitList; 1098 return hadError; 1099} 1100 1101/// GetNameForDeclarator - Determine the full declaration name for the 1102/// given Declarator. 1103DeclarationName Sema::GetNameForDeclarator(Declarator &D) { 1104 switch (D.getKind()) { 1105 case Declarator::DK_Abstract: 1106 assert(D.getIdentifier() == 0 && "abstract declarators have no name"); 1107 return DeclarationName(); 1108 1109 case Declarator::DK_Normal: 1110 assert (D.getIdentifier() != 0 && "normal declarators have an identifier"); 1111 return DeclarationName(D.getIdentifier()); 1112 1113 case Declarator::DK_Constructor: { 1114 QualType Ty = Context.getTypeDeclType((TypeDecl *)D.getDeclaratorIdType()); 1115 Ty = Context.getCanonicalType(Ty); 1116 return Context.DeclarationNames.getCXXConstructorName(Ty); 1117 } 1118 1119 case Declarator::DK_Destructor: { 1120 QualType Ty = Context.getTypeDeclType((TypeDecl *)D.getDeclaratorIdType()); 1121 Ty = Context.getCanonicalType(Ty); 1122 return Context.DeclarationNames.getCXXDestructorName(Ty); 1123 } 1124 1125 case Declarator::DK_Conversion: { 1126 QualType Ty = QualType::getFromOpaquePtr(D.getDeclaratorIdType()); 1127 Ty = Context.getCanonicalType(Ty); 1128 return Context.DeclarationNames.getCXXConversionFunctionName(Ty); 1129 } 1130 1131 case Declarator::DK_Operator: 1132 assert(D.getIdentifier() == 0 && "operator names have no identifier"); 1133 return Context.DeclarationNames.getCXXOperatorName( 1134 D.getOverloadedOperator()); 1135 } 1136 1137 assert(false && "Unknown name kind"); 1138 return DeclarationName(); 1139} 1140 1141/// isNearlyMatchingFunction - Determine whether the C++ functions 1142/// Declaration and Definition are "nearly" matching. This heuristic 1143/// is used to improve diagnostics in the case where an out-of-line 1144/// function definition doesn't match any declaration within 1145/// the class or namespace. 1146static bool isNearlyMatchingFunction(ASTContext &Context, 1147 FunctionDecl *Declaration, 1148 FunctionDecl *Definition) { 1149 if (Declaration->param_size() != Definition->param_size()) 1150 return false; 1151 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 1152 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 1153 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 1154 1155 DeclParamTy = Context.getCanonicalType(DeclParamTy.getNonReferenceType()); 1156 DefParamTy = Context.getCanonicalType(DefParamTy.getNonReferenceType()); 1157 if (DeclParamTy.getUnqualifiedType() != DefParamTy.getUnqualifiedType()) 1158 return false; 1159 } 1160 1161 return true; 1162} 1163 1164Sema::DeclTy * 1165Sema::ActOnDeclarator(Scope *S, Declarator &D, DeclTy *lastDecl, 1166 bool IsFunctionDefinition) { 1167 NamedDecl *LastDeclarator = dyn_cast_or_null<NamedDecl>((Decl *)lastDecl); 1168 DeclarationName Name = GetNameForDeclarator(D); 1169 1170 // All of these full declarators require an identifier. If it doesn't have 1171 // one, the ParsedFreeStandingDeclSpec action should be used. 1172 if (!Name) { 1173 if (!D.getInvalidType()) // Reject this if we think it is valid. 1174 Diag(D.getDeclSpec().getSourceRange().getBegin(), 1175 diag::err_declarator_need_ident) 1176 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 1177 return 0; 1178 } 1179 1180 // The scope passed in may not be a decl scope. Zip up the scope tree until 1181 // we find one that is. 1182 while ((S->getFlags() & Scope::DeclScope) == 0 || 1183 (S->getFlags() & Scope::TemplateParamScope) != 0) 1184 S = S->getParent(); 1185 1186 DeclContext *DC; 1187 NamedDecl *PrevDecl; 1188 NamedDecl *New; 1189 bool InvalidDecl = false; 1190 1191 // See if this is a redefinition of a variable in the same scope. 1192 if (!D.getCXXScopeSpec().isSet() && !D.getCXXScopeSpec().isInvalid()) { 1193 DC = CurContext; 1194 PrevDecl = LookupName(S, Name, LookupOrdinaryName); 1195 } else { // Something like "int foo::x;" 1196 DC = static_cast<DeclContext*>(D.getCXXScopeSpec().getScopeRep()); 1197 PrevDecl = LookupQualifiedName(DC, Name, LookupOrdinaryName); 1198 1199 // C++ 7.3.1.2p2: 1200 // Members (including explicit specializations of templates) of a named 1201 // namespace can also be defined outside that namespace by explicit 1202 // qualification of the name being defined, provided that the entity being 1203 // defined was already declared in the namespace and the definition appears 1204 // after the point of declaration in a namespace that encloses the 1205 // declarations namespace. 1206 // 1207 // Note that we only check the context at this point. We don't yet 1208 // have enough information to make sure that PrevDecl is actually 1209 // the declaration we want to match. For example, given: 1210 // 1211 // class X { 1212 // void f(); 1213 // void f(float); 1214 // }; 1215 // 1216 // void X::f(int) { } // ill-formed 1217 // 1218 // In this case, PrevDecl will point to the overload set 1219 // containing the two f's declared in X, but neither of them 1220 // matches. 1221 1222 // First check whether we named the global scope. 1223 if (isa<TranslationUnitDecl>(DC)) { 1224 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 1225 << Name << D.getCXXScopeSpec().getRange(); 1226 } else if (!CurContext->Encloses(DC)) { 1227 // The qualifying scope doesn't enclose the original declaration. 1228 // Emit diagnostic based on current scope. 1229 SourceLocation L = D.getIdentifierLoc(); 1230 SourceRange R = D.getCXXScopeSpec().getRange(); 1231 if (isa<FunctionDecl>(CurContext)) 1232 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 1233 else 1234 Diag(L, diag::err_invalid_declarator_scope) 1235 << Name << cast<NamedDecl>(DC) << R; 1236 InvalidDecl = true; 1237 } 1238 } 1239 1240 if (PrevDecl && PrevDecl->isTemplateParameter()) { 1241 // Maybe we will complain about the shadowed template parameter. 1242 InvalidDecl = InvalidDecl 1243 || DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 1244 // Just pretend that we didn't see the previous declaration. 1245 PrevDecl = 0; 1246 } 1247 1248 // In C++, the previous declaration we find might be a tag type 1249 // (class or enum). In this case, the new declaration will hide the 1250 // tag type. Note that this does does not apply if we're declaring a 1251 // typedef (C++ [dcl.typedef]p4). 1252 if (PrevDecl && PrevDecl->getIdentifierNamespace() == Decl::IDNS_Tag && 1253 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 1254 PrevDecl = 0; 1255 1256 QualType R = GetTypeForDeclarator(D, S); 1257 assert(!R.isNull() && "GetTypeForDeclarator() returned null type"); 1258 1259 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 1260 New = ActOnTypedefDeclarator(S, D, DC, R, LastDeclarator, PrevDecl, 1261 InvalidDecl); 1262 } else if (R.getTypePtr()->isFunctionType()) { 1263 New = ActOnFunctionDeclarator(S, D, DC, R, LastDeclarator, PrevDecl, 1264 IsFunctionDefinition, InvalidDecl); 1265 } else { 1266 New = ActOnVariableDeclarator(S, D, DC, R, LastDeclarator, PrevDecl, 1267 InvalidDecl); 1268 } 1269 1270 if (New == 0) 1271 return 0; 1272 1273 // Set the lexical context. If the declarator has a C++ scope specifier, the 1274 // lexical context will be different from the semantic context. 1275 New->setLexicalDeclContext(CurContext); 1276 1277 // If this has an identifier, add it to the scope stack. 1278 if (Name) 1279 PushOnScopeChains(New, S); 1280 // If any semantic error occurred, mark the decl as invalid. 1281 if (D.getInvalidType() || InvalidDecl) 1282 New->setInvalidDecl(); 1283 1284 return New; 1285} 1286 1287NamedDecl* 1288Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 1289 QualType R, Decl* LastDeclarator, 1290 Decl* PrevDecl, bool& InvalidDecl) { 1291 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 1292 if (D.getCXXScopeSpec().isSet()) { 1293 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 1294 << D.getCXXScopeSpec().getRange(); 1295 InvalidDecl = true; 1296 // Pretend we didn't see the scope specifier. 1297 DC = 0; 1298 } 1299 1300 // Check that there are no default arguments (C++ only). 1301 if (getLangOptions().CPlusPlus) 1302 CheckExtraCXXDefaultArguments(D); 1303 1304 TypedefDecl *NewTD = ParseTypedefDecl(S, D, R, LastDeclarator); 1305 if (!NewTD) return 0; 1306 1307 // Handle attributes prior to checking for duplicates in MergeVarDecl 1308 ProcessDeclAttributes(NewTD, D); 1309 // Merge the decl with the existing one if appropriate. If the decl is 1310 // in an outer scope, it isn't the same thing. 1311 if (PrevDecl && isDeclInScope(PrevDecl, DC, S)) { 1312 NewTD = MergeTypeDefDecl(NewTD, PrevDecl); 1313 if (NewTD == 0) return 0; 1314 } 1315 1316 if (S->getFnParent() == 0) { 1317 // C99 6.7.7p2: If a typedef name specifies a variably modified type 1318 // then it shall have block scope. 1319 if (NewTD->getUnderlyingType()->isVariablyModifiedType()) { 1320 if (NewTD->getUnderlyingType()->isVariableArrayType()) 1321 Diag(D.getIdentifierLoc(), diag::err_vla_decl_in_file_scope); 1322 else 1323 Diag(D.getIdentifierLoc(), diag::err_vm_decl_in_file_scope); 1324 1325 InvalidDecl = true; 1326 } 1327 } 1328 return NewTD; 1329} 1330 1331NamedDecl* 1332Sema::ActOnVariableDeclarator(Scope* S, Declarator& D, DeclContext* DC, 1333 QualType R, Decl* LastDeclarator, 1334 Decl* PrevDecl, bool& InvalidDecl) { 1335 DeclarationName Name = GetNameForDeclarator(D); 1336 1337 // Check that there are no default arguments (C++ only). 1338 if (getLangOptions().CPlusPlus) 1339 CheckExtraCXXDefaultArguments(D); 1340 1341 if (R.getTypePtr()->isObjCInterfaceType()) { 1342 Diag(D.getIdentifierLoc(), diag::err_statically_allocated_object) 1343 << D.getIdentifier(); 1344 InvalidDecl = true; 1345 } 1346 1347 VarDecl *NewVD; 1348 VarDecl::StorageClass SC; 1349 switch (D.getDeclSpec().getStorageClassSpec()) { 1350 default: assert(0 && "Unknown storage class!"); 1351 case DeclSpec::SCS_unspecified: SC = VarDecl::None; break; 1352 case DeclSpec::SCS_extern: SC = VarDecl::Extern; break; 1353 case DeclSpec::SCS_static: SC = VarDecl::Static; break; 1354 case DeclSpec::SCS_auto: SC = VarDecl::Auto; break; 1355 case DeclSpec::SCS_register: SC = VarDecl::Register; break; 1356 case DeclSpec::SCS_private_extern: SC = VarDecl::PrivateExtern; break; 1357 case DeclSpec::SCS_mutable: 1358 // mutable can only appear on non-static class members, so it's always 1359 // an error here 1360 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 1361 InvalidDecl = true; 1362 SC = VarDecl::None; 1363 break; 1364 } 1365 1366 IdentifierInfo *II = Name.getAsIdentifierInfo(); 1367 if (!II) { 1368 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 1369 << Name.getAsString(); 1370 return 0; 1371 } 1372 1373 if (DC->isRecord()) { 1374 // This is a static data member for a C++ class. 1375 NewVD = CXXClassVarDecl::Create(Context, cast<CXXRecordDecl>(DC), 1376 D.getIdentifierLoc(), II, 1377 R); 1378 } else { 1379 bool ThreadSpecified = D.getDeclSpec().isThreadSpecified(); 1380 if (S->getFnParent() == 0) { 1381 // C99 6.9p2: The storage-class specifiers auto and register shall not 1382 // appear in the declaration specifiers in an external declaration. 1383 if (SC == VarDecl::Auto || SC == VarDecl::Register) { 1384 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 1385 InvalidDecl = true; 1386 } 1387 } 1388 NewVD = VarDecl::Create(Context, DC, D.getIdentifierLoc(), 1389 II, R, SC, 1390 // FIXME: Move to DeclGroup... 1391 D.getDeclSpec().getSourceRange().getBegin()); 1392 NewVD->setThreadSpecified(ThreadSpecified); 1393 } 1394 NewVD->setNextDeclarator(LastDeclarator); 1395 1396 // Handle attributes prior to checking for duplicates in MergeVarDecl 1397 ProcessDeclAttributes(NewVD, D); 1398 1399 // Handle GNU asm-label extension (encoded as an attribute). 1400 if (Expr *E = (Expr*) D.getAsmLabel()) { 1401 // The parser guarantees this is a string. 1402 StringLiteral *SE = cast<StringLiteral>(E); 1403 NewVD->addAttr(new AsmLabelAttr(std::string(SE->getStrData(), 1404 SE->getByteLength()))); 1405 } 1406 1407 // Emit an error if an address space was applied to decl with local storage. 1408 // This includes arrays of objects with address space qualifiers, but not 1409 // automatic variables that point to other address spaces. 1410 // ISO/IEC TR 18037 S5.1.2 1411 if (NewVD->hasLocalStorage() && (NewVD->getType().getAddressSpace() != 0)) { 1412 Diag(D.getIdentifierLoc(), diag::err_as_qualified_auto_decl); 1413 InvalidDecl = true; 1414 } 1415 // Merge the decl with the existing one if appropriate. If the decl is 1416 // in an outer scope, it isn't the same thing. 1417 if (PrevDecl && isDeclInScope(PrevDecl, DC, S)) { 1418 if (isa<FieldDecl>(PrevDecl) && D.getCXXScopeSpec().isSet()) { 1419 // The user tried to define a non-static data member 1420 // out-of-line (C++ [dcl.meaning]p1). 1421 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 1422 << D.getCXXScopeSpec().getRange(); 1423 NewVD->Destroy(Context); 1424 return 0; 1425 } 1426 1427 NewVD = MergeVarDecl(NewVD, PrevDecl); 1428 if (NewVD == 0) return 0; 1429 1430 if (D.getCXXScopeSpec().isSet()) { 1431 // No previous declaration in the qualifying scope. 1432 Diag(D.getIdentifierLoc(), diag::err_typecheck_no_member) 1433 << Name << D.getCXXScopeSpec().getRange(); 1434 InvalidDecl = true; 1435 } 1436 } 1437 return NewVD; 1438} 1439 1440NamedDecl* 1441Sema::ActOnFunctionDeclarator(Scope* S, Declarator& D, DeclContext* DC, 1442 QualType R, Decl *LastDeclarator, 1443 Decl* PrevDecl, bool IsFunctionDefinition, 1444 bool& InvalidDecl) { 1445 assert(R.getTypePtr()->isFunctionType()); 1446 1447 DeclarationName Name = GetNameForDeclarator(D); 1448 FunctionDecl::StorageClass SC = FunctionDecl::None; 1449 switch (D.getDeclSpec().getStorageClassSpec()) { 1450 default: assert(0 && "Unknown storage class!"); 1451 case DeclSpec::SCS_auto: 1452 case DeclSpec::SCS_register: 1453 case DeclSpec::SCS_mutable: 1454 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_func); 1455 InvalidDecl = true; 1456 break; 1457 case DeclSpec::SCS_unspecified: SC = FunctionDecl::None; break; 1458 case DeclSpec::SCS_extern: SC = FunctionDecl::Extern; break; 1459 case DeclSpec::SCS_static: SC = FunctionDecl::Static; break; 1460 case DeclSpec::SCS_private_extern: SC = FunctionDecl::PrivateExtern;break; 1461 } 1462 1463 bool isInline = D.getDeclSpec().isInlineSpecified(); 1464 // bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 1465 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 1466 1467 FunctionDecl *NewFD; 1468 if (D.getKind() == Declarator::DK_Constructor) { 1469 // This is a C++ constructor declaration. 1470 assert(DC->isRecord() && 1471 "Constructors can only be declared in a member context"); 1472 1473 InvalidDecl = InvalidDecl || CheckConstructorDeclarator(D, R, SC); 1474 1475 // Create the new declaration 1476 NewFD = CXXConstructorDecl::Create(Context, 1477 cast<CXXRecordDecl>(DC), 1478 D.getIdentifierLoc(), Name, R, 1479 isExplicit, isInline, 1480 /*isImplicitlyDeclared=*/false); 1481 1482 if (InvalidDecl) 1483 NewFD->setInvalidDecl(); 1484 } else if (D.getKind() == Declarator::DK_Destructor) { 1485 // This is a C++ destructor declaration. 1486 if (DC->isRecord()) { 1487 InvalidDecl = InvalidDecl || CheckDestructorDeclarator(D, R, SC); 1488 1489 NewFD = CXXDestructorDecl::Create(Context, 1490 cast<CXXRecordDecl>(DC), 1491 D.getIdentifierLoc(), Name, R, 1492 isInline, 1493 /*isImplicitlyDeclared=*/false); 1494 1495 if (InvalidDecl) 1496 NewFD->setInvalidDecl(); 1497 } else { 1498 Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 1499 1500 // Create a FunctionDecl to satisfy the function definition parsing 1501 // code path. 1502 NewFD = FunctionDecl::Create(Context, DC, D.getIdentifierLoc(), 1503 Name, R, SC, isInline, 1504 // FIXME: Move to DeclGroup... 1505 D.getDeclSpec().getSourceRange().getBegin()); 1506 InvalidDecl = true; 1507 NewFD->setInvalidDecl(); 1508 } 1509 } else if (D.getKind() == Declarator::DK_Conversion) { 1510 if (!DC->isRecord()) { 1511 Diag(D.getIdentifierLoc(), 1512 diag::err_conv_function_not_member); 1513 return 0; 1514 } else { 1515 InvalidDecl = InvalidDecl || CheckConversionDeclarator(D, R, SC); 1516 1517 NewFD = CXXConversionDecl::Create(Context, cast<CXXRecordDecl>(DC), 1518 D.getIdentifierLoc(), Name, R, 1519 isInline, isExplicit); 1520 1521 if (InvalidDecl) 1522 NewFD->setInvalidDecl(); 1523 } 1524 } else if (DC->isRecord()) { 1525 // This is a C++ method declaration. 1526 NewFD = CXXMethodDecl::Create(Context, cast<CXXRecordDecl>(DC), 1527 D.getIdentifierLoc(), Name, R, 1528 (SC == FunctionDecl::Static), isInline); 1529 } else { 1530 NewFD = FunctionDecl::Create(Context, DC, 1531 D.getIdentifierLoc(), 1532 Name, R, SC, isInline, 1533 // FIXME: Move to DeclGroup... 1534 D.getDeclSpec().getSourceRange().getBegin()); 1535 } 1536 NewFD->setNextDeclarator(LastDeclarator); 1537 1538 // Set the lexical context. If the declarator has a C++ 1539 // scope specifier, the lexical context will be different 1540 // from the semantic context. 1541 NewFD->setLexicalDeclContext(CurContext); 1542 1543 // Handle GNU asm-label extension (encoded as an attribute). 1544 if (Expr *E = (Expr*) D.getAsmLabel()) { 1545 // The parser guarantees this is a string. 1546 StringLiteral *SE = cast<StringLiteral>(E); 1547 NewFD->addAttr(new AsmLabelAttr(std::string(SE->getStrData(), 1548 SE->getByteLength()))); 1549 } 1550 1551 // Copy the parameter declarations from the declarator D to 1552 // the function declaration NewFD, if they are available. 1553 if (D.getNumTypeObjects() > 0) { 1554 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 1555 1556 // Create Decl objects for each parameter, adding them to the 1557 // FunctionDecl. 1558 llvm::SmallVector<ParmVarDecl*, 16> Params; 1559 1560 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 1561 // function that takes no arguments, not a function that takes a 1562 // single void argument. 1563 // We let through "const void" here because Sema::GetTypeForDeclarator 1564 // already checks for that case. 1565 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 1566 FTI.ArgInfo[0].Param && 1567 ((ParmVarDecl*)FTI.ArgInfo[0].Param)->getType()->isVoidType()) { 1568 // empty arg list, don't push any params. 1569 ParmVarDecl *Param = (ParmVarDecl*)FTI.ArgInfo[0].Param; 1570 1571 // In C++, the empty parameter-type-list must be spelled "void"; a 1572 // typedef of void is not permitted. 1573 if (getLangOptions().CPlusPlus && 1574 Param->getType().getUnqualifiedType() != Context.VoidTy) { 1575 Diag(Param->getLocation(), diag::ext_param_typedef_of_void); 1576 } 1577 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 1578 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) 1579 Params.push_back((ParmVarDecl *)FTI.ArgInfo[i].Param); 1580 } 1581 1582 NewFD->setParams(Context, &Params[0], Params.size()); 1583 } else if (R->getAsTypedefType()) { 1584 // When we're declaring a function with a typedef, as in the 1585 // following example, we'll need to synthesize (unnamed) 1586 // parameters for use in the declaration. 1587 // 1588 // @code 1589 // typedef void fn(int); 1590 // fn f; 1591 // @endcode 1592 const FunctionTypeProto *FT = R->getAsFunctionTypeProto(); 1593 if (!FT) { 1594 // This is a typedef of a function with no prototype, so we 1595 // don't need to do anything. 1596 } else if ((FT->getNumArgs() == 0) || 1597 (FT->getNumArgs() == 1 && !FT->isVariadic() && 1598 FT->getArgType(0)->isVoidType())) { 1599 // This is a zero-argument function. We don't need to do anything. 1600 } else { 1601 // Synthesize a parameter for each argument type. 1602 llvm::SmallVector<ParmVarDecl*, 16> Params; 1603 for (FunctionTypeProto::arg_type_iterator ArgType = FT->arg_type_begin(); 1604 ArgType != FT->arg_type_end(); ++ArgType) { 1605 Params.push_back(ParmVarDecl::Create(Context, DC, 1606 SourceLocation(), 0, 1607 *ArgType, VarDecl::None, 1608 0)); 1609 } 1610 1611 NewFD->setParams(Context, &Params[0], Params.size()); 1612 } 1613 } 1614 1615 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) 1616 InvalidDecl = InvalidDecl || CheckConstructor(Constructor); 1617 else if (isa<CXXDestructorDecl>(NewFD)) { 1618 CXXRecordDecl *Record = cast<CXXRecordDecl>(NewFD->getParent()); 1619 Record->setUserDeclaredDestructor(true); 1620 // C++ [class]p4: A POD-struct is an aggregate class that has [...] no 1621 // user-defined destructor. 1622 Record->setPOD(false); 1623 } else if (CXXConversionDecl *Conversion = 1624 dyn_cast<CXXConversionDecl>(NewFD)) 1625 ActOnConversionDeclarator(Conversion); 1626 1627 // Extra checking for C++ overloaded operators (C++ [over.oper]). 1628 if (NewFD->isOverloadedOperator() && 1629 CheckOverloadedOperatorDeclaration(NewFD)) 1630 NewFD->setInvalidDecl(); 1631 1632 // Merge the decl with the existing one if appropriate. Since C functions 1633 // are in a flat namespace, make sure we consider decls in outer scopes. 1634 bool Redeclaration = false; 1635 if (PrevDecl && 1636 (!getLangOptions().CPlusPlus||isDeclInScope(PrevDecl, DC, S))) { 1637 // If C++, determine whether NewFD is an overload of PrevDecl or 1638 // a declaration that requires merging. If it's an overload, 1639 // there's no more work to do here; we'll just add the new 1640 // function to the scope. 1641 OverloadedFunctionDecl::function_iterator MatchedDecl; 1642 if (!getLangOptions().CPlusPlus || 1643 !IsOverload(NewFD, PrevDecl, MatchedDecl)) { 1644 Decl *OldDecl = PrevDecl; 1645 1646 // If PrevDecl was an overloaded function, extract the 1647 // FunctionDecl that matched. 1648 if (isa<OverloadedFunctionDecl>(PrevDecl)) 1649 OldDecl = *MatchedDecl; 1650 1651 // NewFD and PrevDecl represent declarations that need to be 1652 // merged. 1653 NewFD = MergeFunctionDecl(NewFD, OldDecl, Redeclaration); 1654 1655 if (NewFD == 0) return 0; 1656 if (Redeclaration) { 1657 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 1658 1659 // An out-of-line member function declaration must also be a 1660 // definition (C++ [dcl.meaning]p1). 1661 if (!IsFunctionDefinition && D.getCXXScopeSpec().isSet() && 1662 !InvalidDecl) { 1663 Diag(NewFD->getLocation(), diag::err_out_of_line_declaration) 1664 << D.getCXXScopeSpec().getRange(); 1665 NewFD->setInvalidDecl(); 1666 } 1667 } 1668 } 1669 } 1670 1671 if (D.getCXXScopeSpec().isSet() && 1672 (!PrevDecl || !Redeclaration)) { 1673 // The user tried to provide an out-of-line definition for a 1674 // function that is a member of a class or namespace, but there 1675 // was no such member function declared (C++ [class.mfct]p2, 1676 // C++ [namespace.memdef]p2). For example: 1677 // 1678 // class X { 1679 // void f() const; 1680 // }; 1681 // 1682 // void X::f() { } // ill-formed 1683 // 1684 // Complain about this problem, and attempt to suggest close 1685 // matches (e.g., those that differ only in cv-qualifiers and 1686 // whether the parameter types are references). 1687 Diag(D.getIdentifierLoc(), diag::err_member_def_does_not_match) 1688 << cast<NamedDecl>(DC) << D.getCXXScopeSpec().getRange(); 1689 InvalidDecl = true; 1690 1691 LookupResult Prev = LookupQualifiedName(DC, Name, LookupOrdinaryName, 1692 true); 1693 assert(!Prev.isAmbiguous() && 1694 "Cannot have an ambiguity in previous-declaration lookup"); 1695 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 1696 Func != FuncEnd; ++Func) { 1697 if (isa<FunctionDecl>(*Func) && 1698 isNearlyMatchingFunction(Context, cast<FunctionDecl>(*Func), NewFD)) 1699 Diag((*Func)->getLocation(), diag::note_member_def_close_match); 1700 } 1701 1702 PrevDecl = 0; 1703 } 1704 1705 // Handle attributes. We need to have merged decls when handling attributes 1706 // (for example to check for conflicts, etc). 1707 ProcessDeclAttributes(NewFD, D); 1708 1709 if (getLangOptions().CPlusPlus) { 1710 // In C++, check default arguments now that we have merged decls. 1711 CheckCXXDefaultArguments(NewFD); 1712 1713 // An out-of-line member function declaration must also be a 1714 // definition (C++ [dcl.meaning]p1). 1715 if (!IsFunctionDefinition && D.getCXXScopeSpec().isSet() && !InvalidDecl) { 1716 Diag(NewFD->getLocation(), diag::err_out_of_line_declaration) 1717 << D.getCXXScopeSpec().getRange(); 1718 InvalidDecl = true; 1719 } 1720 } 1721 return NewFD; 1722} 1723 1724void Sema::InitializerElementNotConstant(const Expr *Init) { 1725 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 1726 << Init->getSourceRange(); 1727} 1728 1729bool Sema::CheckAddressConstantExpressionLValue(const Expr* Init) { 1730 switch (Init->getStmtClass()) { 1731 default: 1732 InitializerElementNotConstant(Init); 1733 return true; 1734 case Expr::ParenExprClass: { 1735 const ParenExpr* PE = cast<ParenExpr>(Init); 1736 return CheckAddressConstantExpressionLValue(PE->getSubExpr()); 1737 } 1738 case Expr::CompoundLiteralExprClass: 1739 return cast<CompoundLiteralExpr>(Init)->isFileScope(); 1740 case Expr::DeclRefExprClass: 1741 case Expr::QualifiedDeclRefExprClass: { 1742 const Decl *D = cast<DeclRefExpr>(Init)->getDecl(); 1743 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1744 if (VD->hasGlobalStorage()) 1745 return false; 1746 InitializerElementNotConstant(Init); 1747 return true; 1748 } 1749 if (isa<FunctionDecl>(D)) 1750 return false; 1751 InitializerElementNotConstant(Init); 1752 return true; 1753 } 1754 case Expr::MemberExprClass: { 1755 const MemberExpr *M = cast<MemberExpr>(Init); 1756 if (M->isArrow()) 1757 return CheckAddressConstantExpression(M->getBase()); 1758 return CheckAddressConstantExpressionLValue(M->getBase()); 1759 } 1760 case Expr::ArraySubscriptExprClass: { 1761 // FIXME: Should we pedwarn for "x[0+0]" (where x is a pointer)? 1762 const ArraySubscriptExpr *ASE = cast<ArraySubscriptExpr>(Init); 1763 return CheckAddressConstantExpression(ASE->getBase()) || 1764 CheckArithmeticConstantExpression(ASE->getIdx()); 1765 } 1766 case Expr::StringLiteralClass: 1767 case Expr::PredefinedExprClass: 1768 return false; 1769 case Expr::UnaryOperatorClass: { 1770 const UnaryOperator *Exp = cast<UnaryOperator>(Init); 1771 1772 // C99 6.6p9 1773 if (Exp->getOpcode() == UnaryOperator::Deref) 1774 return CheckAddressConstantExpression(Exp->getSubExpr()); 1775 1776 InitializerElementNotConstant(Init); 1777 return true; 1778 } 1779 } 1780} 1781 1782bool Sema::CheckAddressConstantExpression(const Expr* Init) { 1783 switch (Init->getStmtClass()) { 1784 default: 1785 InitializerElementNotConstant(Init); 1786 return true; 1787 case Expr::ParenExprClass: 1788 return CheckAddressConstantExpression(cast<ParenExpr>(Init)->getSubExpr()); 1789 case Expr::StringLiteralClass: 1790 case Expr::ObjCStringLiteralClass: 1791 return false; 1792 case Expr::CallExprClass: 1793 case Expr::CXXOperatorCallExprClass: 1794 // __builtin___CFStringMakeConstantString is a valid constant l-value. 1795 if (cast<CallExpr>(Init)->isBuiltinCall() == 1796 Builtin::BI__builtin___CFStringMakeConstantString) 1797 return false; 1798 1799 InitializerElementNotConstant(Init); 1800 return true; 1801 1802 case Expr::UnaryOperatorClass: { 1803 const UnaryOperator *Exp = cast<UnaryOperator>(Init); 1804 1805 // C99 6.6p9 1806 if (Exp->getOpcode() == UnaryOperator::AddrOf) 1807 return CheckAddressConstantExpressionLValue(Exp->getSubExpr()); 1808 1809 if (Exp->getOpcode() == UnaryOperator::Extension) 1810 return CheckAddressConstantExpression(Exp->getSubExpr()); 1811 1812 InitializerElementNotConstant(Init); 1813 return true; 1814 } 1815 case Expr::BinaryOperatorClass: { 1816 // FIXME: Should we pedwarn for expressions like "a + 1 + 2"? 1817 const BinaryOperator *Exp = cast<BinaryOperator>(Init); 1818 1819 Expr *PExp = Exp->getLHS(); 1820 Expr *IExp = Exp->getRHS(); 1821 if (IExp->getType()->isPointerType()) 1822 std::swap(PExp, IExp); 1823 1824 // FIXME: Should we pedwarn if IExp isn't an integer constant expression? 1825 return CheckAddressConstantExpression(PExp) || 1826 CheckArithmeticConstantExpression(IExp); 1827 } 1828 case Expr::ImplicitCastExprClass: 1829 case Expr::CStyleCastExprClass: { 1830 const Expr* SubExpr = cast<CastExpr>(Init)->getSubExpr(); 1831 if (Init->getStmtClass() == Expr::ImplicitCastExprClass) { 1832 // Check for implicit promotion 1833 if (SubExpr->getType()->isFunctionType() || 1834 SubExpr->getType()->isArrayType()) 1835 return CheckAddressConstantExpressionLValue(SubExpr); 1836 } 1837 1838 // Check for pointer->pointer cast 1839 if (SubExpr->getType()->isPointerType()) 1840 return CheckAddressConstantExpression(SubExpr); 1841 1842 if (SubExpr->getType()->isIntegralType()) { 1843 // Check for the special-case of a pointer->int->pointer cast; 1844 // this isn't standard, but some code requires it. See 1845 // PR2720 for an example. 1846 if (const CastExpr* SubCast = dyn_cast<CastExpr>(SubExpr)) { 1847 if (SubCast->getSubExpr()->getType()->isPointerType()) { 1848 unsigned IntWidth = Context.getIntWidth(SubCast->getType()); 1849 unsigned PointerWidth = Context.getTypeSize(Context.VoidPtrTy); 1850 if (IntWidth >= PointerWidth) { 1851 return CheckAddressConstantExpression(SubCast->getSubExpr()); 1852 } 1853 } 1854 } 1855 } 1856 if (SubExpr->getType()->isArithmeticType()) { 1857 return CheckArithmeticConstantExpression(SubExpr); 1858 } 1859 1860 InitializerElementNotConstant(Init); 1861 return true; 1862 } 1863 case Expr::ConditionalOperatorClass: { 1864 // FIXME: Should we pedwarn here? 1865 const ConditionalOperator *Exp = cast<ConditionalOperator>(Init); 1866 if (!Exp->getCond()->getType()->isArithmeticType()) { 1867 InitializerElementNotConstant(Init); 1868 return true; 1869 } 1870 if (CheckArithmeticConstantExpression(Exp->getCond())) 1871 return true; 1872 if (Exp->getLHS() && 1873 CheckAddressConstantExpression(Exp->getLHS())) 1874 return true; 1875 return CheckAddressConstantExpression(Exp->getRHS()); 1876 } 1877 case Expr::AddrLabelExprClass: 1878 return false; 1879 } 1880} 1881 1882static const Expr* FindExpressionBaseAddress(const Expr* E); 1883 1884static const Expr* FindExpressionBaseAddressLValue(const Expr* E) { 1885 switch (E->getStmtClass()) { 1886 default: 1887 return E; 1888 case Expr::ParenExprClass: { 1889 const ParenExpr* PE = cast<ParenExpr>(E); 1890 return FindExpressionBaseAddressLValue(PE->getSubExpr()); 1891 } 1892 case Expr::MemberExprClass: { 1893 const MemberExpr *M = cast<MemberExpr>(E); 1894 if (M->isArrow()) 1895 return FindExpressionBaseAddress(M->getBase()); 1896 return FindExpressionBaseAddressLValue(M->getBase()); 1897 } 1898 case Expr::ArraySubscriptExprClass: { 1899 const ArraySubscriptExpr *ASE = cast<ArraySubscriptExpr>(E); 1900 return FindExpressionBaseAddress(ASE->getBase()); 1901 } 1902 case Expr::UnaryOperatorClass: { 1903 const UnaryOperator *Exp = cast<UnaryOperator>(E); 1904 1905 if (Exp->getOpcode() == UnaryOperator::Deref) 1906 return FindExpressionBaseAddress(Exp->getSubExpr()); 1907 1908 return E; 1909 } 1910 } 1911} 1912 1913static const Expr* FindExpressionBaseAddress(const Expr* E) { 1914 switch (E->getStmtClass()) { 1915 default: 1916 return E; 1917 case Expr::ParenExprClass: { 1918 const ParenExpr* PE = cast<ParenExpr>(E); 1919 return FindExpressionBaseAddress(PE->getSubExpr()); 1920 } 1921 case Expr::UnaryOperatorClass: { 1922 const UnaryOperator *Exp = cast<UnaryOperator>(E); 1923 1924 // C99 6.6p9 1925 if (Exp->getOpcode() == UnaryOperator::AddrOf) 1926 return FindExpressionBaseAddressLValue(Exp->getSubExpr()); 1927 1928 if (Exp->getOpcode() == UnaryOperator::Extension) 1929 return FindExpressionBaseAddress(Exp->getSubExpr()); 1930 1931 return E; 1932 } 1933 case Expr::BinaryOperatorClass: { 1934 const BinaryOperator *Exp = cast<BinaryOperator>(E); 1935 1936 Expr *PExp = Exp->getLHS(); 1937 Expr *IExp = Exp->getRHS(); 1938 if (IExp->getType()->isPointerType()) 1939 std::swap(PExp, IExp); 1940 1941 return FindExpressionBaseAddress(PExp); 1942 } 1943 case Expr::ImplicitCastExprClass: { 1944 const Expr* SubExpr = cast<ImplicitCastExpr>(E)->getSubExpr(); 1945 1946 // Check for implicit promotion 1947 if (SubExpr->getType()->isFunctionType() || 1948 SubExpr->getType()->isArrayType()) 1949 return FindExpressionBaseAddressLValue(SubExpr); 1950 1951 // Check for pointer->pointer cast 1952 if (SubExpr->getType()->isPointerType()) 1953 return FindExpressionBaseAddress(SubExpr); 1954 1955 // We assume that we have an arithmetic expression here; 1956 // if we don't, we'll figure it out later 1957 return 0; 1958 } 1959 case Expr::CStyleCastExprClass: { 1960 const Expr* SubExpr = cast<CastExpr>(E)->getSubExpr(); 1961 1962 // Check for pointer->pointer cast 1963 if (SubExpr->getType()->isPointerType()) 1964 return FindExpressionBaseAddress(SubExpr); 1965 1966 // We assume that we have an arithmetic expression here; 1967 // if we don't, we'll figure it out later 1968 return 0; 1969 } 1970 } 1971} 1972 1973bool Sema::CheckArithmeticConstantExpression(const Expr* Init) { 1974 switch (Init->getStmtClass()) { 1975 default: 1976 InitializerElementNotConstant(Init); 1977 return true; 1978 case Expr::ParenExprClass: { 1979 const ParenExpr* PE = cast<ParenExpr>(Init); 1980 return CheckArithmeticConstantExpression(PE->getSubExpr()); 1981 } 1982 case Expr::FloatingLiteralClass: 1983 case Expr::IntegerLiteralClass: 1984 case Expr::CharacterLiteralClass: 1985 case Expr::ImaginaryLiteralClass: 1986 case Expr::TypesCompatibleExprClass: 1987 case Expr::CXXBoolLiteralExprClass: 1988 return false; 1989 case Expr::CallExprClass: 1990 case Expr::CXXOperatorCallExprClass: { 1991 const CallExpr *CE = cast<CallExpr>(Init); 1992 1993 // Allow any constant foldable calls to builtins. 1994 if (CE->isBuiltinCall() && CE->isEvaluatable(Context)) 1995 return false; 1996 1997 InitializerElementNotConstant(Init); 1998 return true; 1999 } 2000 case Expr::DeclRefExprClass: 2001 case Expr::QualifiedDeclRefExprClass: { 2002 const Decl *D = cast<DeclRefExpr>(Init)->getDecl(); 2003 if (isa<EnumConstantDecl>(D)) 2004 return false; 2005 InitializerElementNotConstant(Init); 2006 return true; 2007 } 2008 case Expr::CompoundLiteralExprClass: 2009 // Allow "(vector type){2,4}"; normal C constraints don't allow this, 2010 // but vectors are allowed to be magic. 2011 if (Init->getType()->isVectorType()) 2012 return false; 2013 InitializerElementNotConstant(Init); 2014 return true; 2015 case Expr::UnaryOperatorClass: { 2016 const UnaryOperator *Exp = cast<UnaryOperator>(Init); 2017 2018 switch (Exp->getOpcode()) { 2019 // Address, indirect, pre/post inc/dec, etc are not valid constant exprs. 2020 // See C99 6.6p3. 2021 default: 2022 InitializerElementNotConstant(Init); 2023 return true; 2024 case UnaryOperator::OffsetOf: 2025 if (Exp->getSubExpr()->getType()->isConstantSizeType()) 2026 return false; 2027 InitializerElementNotConstant(Init); 2028 return true; 2029 case UnaryOperator::Extension: 2030 case UnaryOperator::LNot: 2031 case UnaryOperator::Plus: 2032 case UnaryOperator::Minus: 2033 case UnaryOperator::Not: 2034 return CheckArithmeticConstantExpression(Exp->getSubExpr()); 2035 } 2036 } 2037 case Expr::SizeOfAlignOfExprClass: { 2038 const SizeOfAlignOfExpr *Exp = cast<SizeOfAlignOfExpr>(Init); 2039 // Special check for void types, which are allowed as an extension 2040 if (Exp->getTypeOfArgument()->isVoidType()) 2041 return false; 2042 // alignof always evaluates to a constant. 2043 // FIXME: is sizeof(int[3.0]) a constant expression? 2044 if (Exp->isSizeOf() && !Exp->getTypeOfArgument()->isConstantSizeType()) { 2045 InitializerElementNotConstant(Init); 2046 return true; 2047 } 2048 return false; 2049 } 2050 case Expr::BinaryOperatorClass: { 2051 const BinaryOperator *Exp = cast<BinaryOperator>(Init); 2052 2053 if (Exp->getLHS()->getType()->isArithmeticType() && 2054 Exp->getRHS()->getType()->isArithmeticType()) { 2055 return CheckArithmeticConstantExpression(Exp->getLHS()) || 2056 CheckArithmeticConstantExpression(Exp->getRHS()); 2057 } 2058 2059 if (Exp->getLHS()->getType()->isPointerType() && 2060 Exp->getRHS()->getType()->isPointerType()) { 2061 const Expr* LHSBase = FindExpressionBaseAddress(Exp->getLHS()); 2062 const Expr* RHSBase = FindExpressionBaseAddress(Exp->getRHS()); 2063 2064 // Only allow a null (constant integer) base; we could 2065 // allow some additional cases if necessary, but this 2066 // is sufficient to cover offsetof-like constructs. 2067 if (!LHSBase && !RHSBase) { 2068 return CheckAddressConstantExpression(Exp->getLHS()) || 2069 CheckAddressConstantExpression(Exp->getRHS()); 2070 } 2071 } 2072 2073 InitializerElementNotConstant(Init); 2074 return true; 2075 } 2076 case Expr::ImplicitCastExprClass: 2077 case Expr::CStyleCastExprClass: { 2078 const CastExpr *CE = cast<CastExpr>(Init); 2079 const Expr *SubExpr = CE->getSubExpr(); 2080 2081 if (SubExpr->getType()->isArithmeticType()) 2082 return CheckArithmeticConstantExpression(SubExpr); 2083 2084 if (SubExpr->getType()->isPointerType()) { 2085 const Expr* Base = FindExpressionBaseAddress(SubExpr); 2086 if (Base) { 2087 // the cast is only valid if done to a wide enough type 2088 if (Context.getTypeSize(CE->getType()) >= 2089 Context.getTypeSize(SubExpr->getType())) 2090 return false; 2091 } else { 2092 // If the pointer has a null base, this is an offsetof-like construct 2093 return CheckAddressConstantExpression(SubExpr); 2094 } 2095 } 2096 2097 InitializerElementNotConstant(Init); 2098 return true; 2099 } 2100 case Expr::ConditionalOperatorClass: { 2101 const ConditionalOperator *Exp = cast<ConditionalOperator>(Init); 2102 2103 // If GNU extensions are disabled, we require all operands to be arithmetic 2104 // constant expressions. 2105 if (getLangOptions().NoExtensions) { 2106 return CheckArithmeticConstantExpression(Exp->getCond()) || 2107 (Exp->getLHS() && CheckArithmeticConstantExpression(Exp->getLHS())) || 2108 CheckArithmeticConstantExpression(Exp->getRHS()); 2109 } 2110 2111 // Otherwise, we have to emulate some of the behavior of fold here. 2112 // Basically GCC treats things like "4 ? 1 : somefunc()" as a constant 2113 // because it can constant fold things away. To retain compatibility with 2114 // GCC code, we see if we can fold the condition to a constant (which we 2115 // should always be able to do in theory). If so, we only require the 2116 // specified arm of the conditional to be a constant. This is a horrible 2117 // hack, but is require by real world code that uses __builtin_constant_p. 2118 Expr::EvalResult EvalResult; 2119 if (!Exp->getCond()->Evaluate(EvalResult, Context) || 2120 EvalResult.HasSideEffects) { 2121 // If Evaluate couldn't fold it, CheckArithmeticConstantExpression 2122 // won't be able to either. Use it to emit the diagnostic though. 2123 bool Res = CheckArithmeticConstantExpression(Exp->getCond()); 2124 assert(Res && "Evaluate couldn't evaluate this constant?"); 2125 return Res; 2126 } 2127 2128 // Verify that the side following the condition is also a constant. 2129 const Expr *TrueSide = Exp->getLHS(), *FalseSide = Exp->getRHS(); 2130 if (EvalResult.Val.getInt() == 0) 2131 std::swap(TrueSide, FalseSide); 2132 2133 if (TrueSide && CheckArithmeticConstantExpression(TrueSide)) 2134 return true; 2135 2136 // Okay, the evaluated side evaluates to a constant, so we accept this. 2137 // Check to see if the other side is obviously not a constant. If so, 2138 // emit a warning that this is a GNU extension. 2139 if (FalseSide && !FalseSide->isEvaluatable(Context)) 2140 Diag(Init->getExprLoc(), 2141 diag::ext_typecheck_expression_not_constant_but_accepted) 2142 << FalseSide->getSourceRange(); 2143 return false; 2144 } 2145 } 2146} 2147 2148bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 2149 if (DesignatedInitExpr *DIE = dyn_cast<DesignatedInitExpr>(Init)) 2150 Init = DIE->getInit(); 2151 2152 Init = Init->IgnoreParens(); 2153 2154 if (Init->isEvaluatable(Context)) 2155 return false; 2156 2157 // Look through CXXDefaultArgExprs; they have no meaning in this context. 2158 if (CXXDefaultArgExpr* DAE = dyn_cast<CXXDefaultArgExpr>(Init)) 2159 return CheckForConstantInitializer(DAE->getExpr(), DclT); 2160 2161 if (CompoundLiteralExpr *e = dyn_cast<CompoundLiteralExpr>(Init)) 2162 return CheckForConstantInitializer(e->getInitializer(), DclT); 2163 2164 if (isa<ImplicitValueInitExpr>(Init)) { 2165 // FIXME: In C++, check for non-POD types. 2166 return false; 2167 } 2168 2169 if (InitListExpr *Exp = dyn_cast<InitListExpr>(Init)) { 2170 unsigned numInits = Exp->getNumInits(); 2171 for (unsigned i = 0; i < numInits; i++) { 2172 // FIXME: Need to get the type of the declaration for C++, 2173 // because it could be a reference? 2174 2175 if (CheckForConstantInitializer(Exp->getInit(i), 2176 Exp->getInit(i)->getType())) 2177 return true; 2178 } 2179 return false; 2180 } 2181 2182 // FIXME: We can probably remove some of this code below, now that 2183 // Expr::Evaluate is doing the heavy lifting for scalars. 2184 2185 if (Init->isNullPointerConstant(Context)) 2186 return false; 2187 if (Init->getType()->isArithmeticType()) { 2188 QualType InitTy = Context.getCanonicalType(Init->getType()) 2189 .getUnqualifiedType(); 2190 if (InitTy == Context.BoolTy) { 2191 // Special handling for pointers implicitly cast to bool; 2192 // (e.g. "_Bool rr = &rr;"). This is only legal at the top level. 2193 if (ImplicitCastExpr* ICE = dyn_cast<ImplicitCastExpr>(Init)) { 2194 Expr* SubE = ICE->getSubExpr(); 2195 if (SubE->getType()->isPointerType() || 2196 SubE->getType()->isArrayType() || 2197 SubE->getType()->isFunctionType()) { 2198 return CheckAddressConstantExpression(Init); 2199 } 2200 } 2201 } else if (InitTy->isIntegralType()) { 2202 Expr* SubE = 0; 2203 if (CastExpr* CE = dyn_cast<CastExpr>(Init)) 2204 SubE = CE->getSubExpr(); 2205 // Special check for pointer cast to int; we allow as an extension 2206 // an address constant cast to an integer if the integer 2207 // is of an appropriate width (this sort of code is apparently used 2208 // in some places). 2209 // FIXME: Add pedwarn? 2210 // FIXME: Don't allow bitfields here! Need the FieldDecl for that. 2211 if (SubE && (SubE->getType()->isPointerType() || 2212 SubE->getType()->isArrayType() || 2213 SubE->getType()->isFunctionType())) { 2214 unsigned IntWidth = Context.getTypeSize(Init->getType()); 2215 unsigned PointerWidth = Context.getTypeSize(Context.VoidPtrTy); 2216 if (IntWidth >= PointerWidth) 2217 return CheckAddressConstantExpression(Init); 2218 } 2219 } 2220 2221 return CheckArithmeticConstantExpression(Init); 2222 } 2223 2224 if (Init->getType()->isPointerType()) 2225 return CheckAddressConstantExpression(Init); 2226 2227 // An array type at the top level that isn't an init-list must 2228 // be a string literal 2229 if (Init->getType()->isArrayType()) 2230 return false; 2231 2232 if (Init->getType()->isFunctionType()) 2233 return false; 2234 2235 // Allow block exprs at top level. 2236 if (Init->getType()->isBlockPointerType()) 2237 return false; 2238 2239 // GCC cast to union extension 2240 // note: the validity of the cast expr is checked by CheckCastTypes() 2241 if (CastExpr *C = dyn_cast<CastExpr>(Init)) { 2242 QualType T = C->getType(); 2243 return T->isUnionType() && CheckForConstantInitializer(C->getSubExpr(), T); 2244 } 2245 2246 InitializerElementNotConstant(Init); 2247 return true; 2248} 2249 2250void Sema::AddInitializerToDecl(DeclTy *dcl, ExprArg init) { 2251 AddInitializerToDecl(dcl, move(init), /*DirectInit=*/false); 2252} 2253 2254/// AddInitializerToDecl - Adds the initializer Init to the 2255/// declaration dcl. If DirectInit is true, this is C++ direct 2256/// initialization rather than copy initialization. 2257void Sema::AddInitializerToDecl(DeclTy *dcl, ExprArg init, bool DirectInit) { 2258 Decl *RealDecl = static_cast<Decl *>(dcl); 2259 Expr *Init = static_cast<Expr *>(init.release()); 2260 assert(Init && "missing initializer"); 2261 2262 // If there is no declaration, there was an error parsing it. Just ignore 2263 // the initializer. 2264 if (RealDecl == 0) { 2265 Init->Destroy(Context); 2266 return; 2267 } 2268 2269 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 2270 if (!VDecl) { 2271 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 2272 RealDecl->setInvalidDecl(); 2273 return; 2274 } 2275 // Get the decls type and save a reference for later, since 2276 // CheckInitializerTypes may change it. 2277 QualType DclT = VDecl->getType(), SavT = DclT; 2278 if (VDecl->isBlockVarDecl()) { 2279 VarDecl::StorageClass SC = VDecl->getStorageClass(); 2280 if (SC == VarDecl::Extern) { // C99 6.7.8p5 2281 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 2282 VDecl->setInvalidDecl(); 2283 } else if (!VDecl->isInvalidDecl()) { 2284 if (CheckInitializerTypes(Init, DclT, VDecl->getLocation(), 2285 VDecl->getDeclName(), DirectInit)) 2286 VDecl->setInvalidDecl(); 2287 2288 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 2289 if (!getLangOptions().CPlusPlus) { 2290 if (SC == VarDecl::Static) // C99 6.7.8p4. 2291 CheckForConstantInitializer(Init, DclT); 2292 } 2293 } 2294 } else if (VDecl->isFileVarDecl()) { 2295 if (VDecl->getStorageClass() == VarDecl::Extern) 2296 Diag(VDecl->getLocation(), diag::warn_extern_init); 2297 if (!VDecl->isInvalidDecl()) 2298 if (CheckInitializerTypes(Init, DclT, VDecl->getLocation(), 2299 VDecl->getDeclName(), DirectInit)) 2300 VDecl->setInvalidDecl(); 2301 2302 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 2303 if (!getLangOptions().CPlusPlus) { 2304 // C99 6.7.8p4. All file scoped initializers need to be constant. 2305 CheckForConstantInitializer(Init, DclT); 2306 } 2307 } 2308 // If the type changed, it means we had an incomplete type that was 2309 // completed by the initializer. For example: 2310 // int ary[] = { 1, 3, 5 }; 2311 // "ary" transitions from a VariableArrayType to a ConstantArrayType. 2312 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 2313 VDecl->setType(DclT); 2314 Init->setType(DclT); 2315 } 2316 2317 // Attach the initializer to the decl. 2318 VDecl->setInit(Init); 2319 return; 2320} 2321 2322void Sema::ActOnUninitializedDecl(DeclTy *dcl) { 2323 Decl *RealDecl = static_cast<Decl *>(dcl); 2324 2325 // If there is no declaration, there was an error parsing it. Just ignore it. 2326 if (RealDecl == 0) 2327 return; 2328 2329 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 2330 QualType Type = Var->getType(); 2331 // C++ [dcl.init.ref]p3: 2332 // The initializer can be omitted for a reference only in a 2333 // parameter declaration (8.3.5), in the declaration of a 2334 // function return type, in the declaration of a class member 2335 // within its class declaration (9.2), and where the extern 2336 // specifier is explicitly used. 2337 if (Type->isReferenceType() && 2338 Var->getStorageClass() != VarDecl::Extern && 2339 Var->getStorageClass() != VarDecl::PrivateExtern) { 2340 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 2341 << Var->getDeclName() 2342 << SourceRange(Var->getLocation(), Var->getLocation()); 2343 Var->setInvalidDecl(); 2344 return; 2345 } 2346 2347 // C++ [dcl.init]p9: 2348 // 2349 // If no initializer is specified for an object, and the object 2350 // is of (possibly cv-qualified) non-POD class type (or array 2351 // thereof), the object shall be default-initialized; if the 2352 // object is of const-qualified type, the underlying class type 2353 // shall have a user-declared default constructor. 2354 if (getLangOptions().CPlusPlus) { 2355 QualType InitType = Type; 2356 if (const ArrayType *Array = Context.getAsArrayType(Type)) 2357 InitType = Array->getElementType(); 2358 if (Var->getStorageClass() != VarDecl::Extern && 2359 Var->getStorageClass() != VarDecl::PrivateExtern && 2360 InitType->isRecordType()) { 2361 const CXXConstructorDecl *Constructor 2362 = PerformInitializationByConstructor(InitType, 0, 0, 2363 Var->getLocation(), 2364 SourceRange(Var->getLocation(), 2365 Var->getLocation()), 2366 Var->getDeclName(), 2367 IK_Default); 2368 if (!Constructor) 2369 Var->setInvalidDecl(); 2370 } 2371 } 2372 2373#if 0 2374 // FIXME: Temporarily disabled because we are not properly parsing 2375 // linkage specifications on declarations, e.g., 2376 // 2377 // extern "C" const CGPoint CGPointerZero; 2378 // 2379 // C++ [dcl.init]p9: 2380 // 2381 // If no initializer is specified for an object, and the 2382 // object is of (possibly cv-qualified) non-POD class type (or 2383 // array thereof), the object shall be default-initialized; if 2384 // the object is of const-qualified type, the underlying class 2385 // type shall have a user-declared default 2386 // constructor. Otherwise, if no initializer is specified for 2387 // an object, the object and its subobjects, if any, have an 2388 // indeterminate initial value; if the object or any of its 2389 // subobjects are of const-qualified type, the program is 2390 // ill-formed. 2391 // 2392 // This isn't technically an error in C, so we don't diagnose it. 2393 // 2394 // FIXME: Actually perform the POD/user-defined default 2395 // constructor check. 2396 if (getLangOptions().CPlusPlus && 2397 Context.getCanonicalType(Type).isConstQualified() && 2398 Var->getStorageClass() != VarDecl::Extern) 2399 Diag(Var->getLocation(), diag::err_const_var_requires_init) 2400 << Var->getName() 2401 << SourceRange(Var->getLocation(), Var->getLocation()); 2402#endif 2403 } 2404} 2405 2406/// The declarators are chained together backwards, reverse the list. 2407Sema::DeclTy *Sema::FinalizeDeclaratorGroup(Scope *S, DeclTy *group) { 2408 // Often we have single declarators, handle them quickly. 2409 Decl *GroupDecl = static_cast<Decl*>(group); 2410 if (GroupDecl == 0) 2411 return 0; 2412 2413 Decl *Group = dyn_cast<Decl>(GroupDecl); 2414 Decl *NewGroup = 0; 2415 if (Group->getNextDeclarator() == 0) 2416 NewGroup = Group; 2417 else { // reverse the list. 2418 while (Group) { 2419 Decl *Next = Group->getNextDeclarator(); 2420 Group->setNextDeclarator(NewGroup); 2421 NewGroup = Group; 2422 Group = Next; 2423 } 2424 } 2425 // Perform semantic analysis that depends on having fully processed both 2426 // the declarator and initializer. 2427 for (Decl *ID = NewGroup; ID; ID = ID->getNextDeclarator()) { 2428 VarDecl *IDecl = dyn_cast<VarDecl>(ID); 2429 if (!IDecl) 2430 continue; 2431 QualType T = IDecl->getType(); 2432 2433 if (T->isVariableArrayType()) { 2434 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 2435 2436 // FIXME: This won't give the correct result for 2437 // int a[10][n]; 2438 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 2439 if (IDecl->isFileVarDecl()) { 2440 Diag(IDecl->getLocation(), diag::err_vla_decl_in_file_scope) << 2441 SizeRange; 2442 2443 IDecl->setInvalidDecl(); 2444 } else { 2445 // C99 6.7.5.2p2: If an identifier is declared to be an object with 2446 // static storage duration, it shall not have a variable length array. 2447 if (IDecl->getStorageClass() == VarDecl::Static) { 2448 Diag(IDecl->getLocation(), diag::err_vla_decl_has_static_storage) 2449 << SizeRange; 2450 IDecl->setInvalidDecl(); 2451 } else if (IDecl->getStorageClass() == VarDecl::Extern) { 2452 Diag(IDecl->getLocation(), diag::err_vla_decl_has_extern_linkage) 2453 << SizeRange; 2454 IDecl->setInvalidDecl(); 2455 } 2456 } 2457 } else if (T->isVariablyModifiedType()) { 2458 if (IDecl->isFileVarDecl()) { 2459 Diag(IDecl->getLocation(), diag::err_vm_decl_in_file_scope); 2460 IDecl->setInvalidDecl(); 2461 } else { 2462 if (IDecl->getStorageClass() == VarDecl::Extern) { 2463 Diag(IDecl->getLocation(), diag::err_vm_decl_has_extern_linkage); 2464 IDecl->setInvalidDecl(); 2465 } 2466 } 2467 } 2468 2469 // Block scope. C99 6.7p7: If an identifier for an object is declared with 2470 // no linkage (C99 6.2.2p6), the type for the object shall be complete... 2471 if (IDecl->isBlockVarDecl() && 2472 IDecl->getStorageClass() != VarDecl::Extern) { 2473 if (!IDecl->isInvalidDecl() && 2474 DiagnoseIncompleteType(IDecl->getLocation(), T, 2475 diag::err_typecheck_decl_incomplete_type)) 2476 IDecl->setInvalidDecl(); 2477 } 2478 // File scope. C99 6.9.2p2: A declaration of an identifier for and 2479 // object that has file scope without an initializer, and without a 2480 // storage-class specifier or with the storage-class specifier "static", 2481 // constitutes a tentative definition. Note: A tentative definition with 2482 // external linkage is valid (C99 6.2.2p5). 2483 if (isTentativeDefinition(IDecl)) { 2484 if (T->isIncompleteArrayType()) { 2485 // C99 6.9.2 (p2, p5): Implicit initialization causes an incomplete 2486 // array to be completed. Don't issue a diagnostic. 2487 } else if (!IDecl->isInvalidDecl() && 2488 DiagnoseIncompleteType(IDecl->getLocation(), T, 2489 diag::err_typecheck_decl_incomplete_type)) 2490 // C99 6.9.2p3: If the declaration of an identifier for an object is 2491 // a tentative definition and has internal linkage (C99 6.2.2p3), the 2492 // declared type shall not be an incomplete type. 2493 IDecl->setInvalidDecl(); 2494 } 2495 if (IDecl->isFileVarDecl()) 2496 CheckForFileScopedRedefinitions(S, IDecl); 2497 } 2498 return NewGroup; 2499} 2500 2501/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 2502/// to introduce parameters into function prototype scope. 2503Sema::DeclTy * 2504Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 2505 const DeclSpec &DS = D.getDeclSpec(); 2506 2507 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 2508 VarDecl::StorageClass StorageClass = VarDecl::None; 2509 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 2510 StorageClass = VarDecl::Register; 2511 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 2512 Diag(DS.getStorageClassSpecLoc(), 2513 diag::err_invalid_storage_class_in_func_decl); 2514 D.getMutableDeclSpec().ClearStorageClassSpecs(); 2515 } 2516 if (DS.isThreadSpecified()) { 2517 Diag(DS.getThreadSpecLoc(), 2518 diag::err_invalid_storage_class_in_func_decl); 2519 D.getMutableDeclSpec().ClearStorageClassSpecs(); 2520 } 2521 2522 // Check that there are no default arguments inside the type of this 2523 // parameter (C++ only). 2524 if (getLangOptions().CPlusPlus) 2525 CheckExtraCXXDefaultArguments(D); 2526 2527 // In this context, we *do not* check D.getInvalidType(). If the declarator 2528 // type was invalid, GetTypeForDeclarator() still returns a "valid" type, 2529 // though it will not reflect the user specified type. 2530 QualType parmDeclType = GetTypeForDeclarator(D, S); 2531 2532 assert(!parmDeclType.isNull() && "GetTypeForDeclarator() returned null type"); 2533 2534 // TODO: CHECK FOR CONFLICTS, multiple decls with same name in one scope. 2535 // Can this happen for params? We already checked that they don't conflict 2536 // among each other. Here they can only shadow globals, which is ok. 2537 IdentifierInfo *II = D.getIdentifier(); 2538 if (II) { 2539 if (NamedDecl *PrevDecl = LookupName(S, II, LookupOrdinaryName)) { 2540 if (PrevDecl->isTemplateParameter()) { 2541 // Maybe we will complain about the shadowed template parameter. 2542 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 2543 // Just pretend that we didn't see the previous declaration. 2544 PrevDecl = 0; 2545 } else if (S->isDeclScope(PrevDecl)) { 2546 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 2547 2548 // Recover by removing the name 2549 II = 0; 2550 D.SetIdentifier(0, D.getIdentifierLoc()); 2551 } 2552 } 2553 } 2554 2555 // Perform the default function/array conversion (C99 6.7.5.3p[7,8]). 2556 // Doing the promotion here has a win and a loss. The win is the type for 2557 // both Decl's and DeclRefExpr's will match (a convenient invariant for the 2558 // code generator). The loss is the orginal type isn't preserved. For example: 2559 // 2560 // void func(int parmvardecl[5]) { // convert "int [5]" to "int *" 2561 // int blockvardecl[5]; 2562 // sizeof(parmvardecl); // size == 4 2563 // sizeof(blockvardecl); // size == 20 2564 // } 2565 // 2566 // For expressions, all implicit conversions are captured using the 2567 // ImplicitCastExpr AST node (we have no such mechanism for Decl's). 2568 // 2569 // FIXME: If a source translation tool needs to see the original type, then 2570 // we need to consider storing both types (in ParmVarDecl)... 2571 // 2572 if (parmDeclType->isArrayType()) { 2573 // int x[restrict 4] -> int *restrict 2574 parmDeclType = Context.getArrayDecayedType(parmDeclType); 2575 } else if (parmDeclType->isFunctionType()) 2576 parmDeclType = Context.getPointerType(parmDeclType); 2577 2578 ParmVarDecl *New = ParmVarDecl::Create(Context, CurContext, 2579 D.getIdentifierLoc(), II, 2580 parmDeclType, StorageClass, 2581 0); 2582 2583 if (D.getInvalidType()) 2584 New->setInvalidDecl(); 2585 2586 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 2587 if (D.getCXXScopeSpec().isSet()) { 2588 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 2589 << D.getCXXScopeSpec().getRange(); 2590 New->setInvalidDecl(); 2591 } 2592 2593 // Add the parameter declaration into this scope. 2594 S->AddDecl(New); 2595 if (II) 2596 IdResolver.AddDecl(New); 2597 2598 ProcessDeclAttributes(New, D); 2599 return New; 2600 2601} 2602 2603void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D) { 2604 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 2605 "Not a function declarator!"); 2606 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2607 2608 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 2609 // for a K&R function. 2610 if (!FTI.hasPrototype) { 2611 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 2612 if (FTI.ArgInfo[i].Param == 0) { 2613 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 2614 << FTI.ArgInfo[i].Ident; 2615 // Implicitly declare the argument as type 'int' for lack of a better 2616 // type. 2617 DeclSpec DS; 2618 const char* PrevSpec; // unused 2619 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 2620 PrevSpec); 2621 Declarator ParamD(DS, Declarator::KNRTypeListContext); 2622 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 2623 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 2624 } 2625 } 2626 } 2627} 2628 2629Sema::DeclTy *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Declarator &D) { 2630 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 2631 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 2632 "Not a function declarator!"); 2633 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2634 2635 if (FTI.hasPrototype) { 2636 // FIXME: Diagnose arguments without names in C. 2637 } 2638 2639 Scope *ParentScope = FnBodyScope->getParent(); 2640 2641 return ActOnStartOfFunctionDef(FnBodyScope, 2642 ActOnDeclarator(ParentScope, D, 0, 2643 /*IsFunctionDefinition=*/true)); 2644} 2645 2646Sema::DeclTy *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, DeclTy *D) { 2647 Decl *decl = static_cast<Decl*>(D); 2648 FunctionDecl *FD = cast<FunctionDecl>(decl); 2649 2650 // See if this is a redefinition. 2651 const FunctionDecl *Definition; 2652 if (FD->getBody(Definition)) { 2653 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 2654 Diag(Definition->getLocation(), diag::note_previous_definition); 2655 } 2656 2657 PushDeclContext(FnBodyScope, FD); 2658 2659 // Check the validity of our function parameters 2660 CheckParmsForFunctionDef(FD); 2661 2662 // Introduce our parameters into the function scope 2663 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 2664 ParmVarDecl *Param = FD->getParamDecl(p); 2665 Param->setOwningFunction(FD); 2666 2667 // If this has an identifier, add it to the scope stack. 2668 if (Param->getIdentifier()) 2669 PushOnScopeChains(Param, FnBodyScope); 2670 } 2671 2672 // Checking attributes of current function definition 2673 // dllimport attribute. 2674 if (FD->getAttr<DLLImportAttr>() && (!FD->getAttr<DLLExportAttr>())) { 2675 // dllimport attribute cannot be applied to definition. 2676 if (!(FD->getAttr<DLLImportAttr>())->isInherited()) { 2677 Diag(FD->getLocation(), 2678 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 2679 << "dllimport"; 2680 FD->setInvalidDecl(); 2681 return FD; 2682 } else { 2683 // If a symbol previously declared dllimport is later defined, the 2684 // attribute is ignored in subsequent references, and a warning is 2685 // emitted. 2686 Diag(FD->getLocation(), 2687 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 2688 << FD->getNameAsCString() << "dllimport"; 2689 } 2690 } 2691 return FD; 2692} 2693 2694Sema::DeclTy *Sema::ActOnFinishFunctionBody(DeclTy *D, StmtArg BodyArg) { 2695 Decl *dcl = static_cast<Decl *>(D); 2696 Stmt *Body = static_cast<Stmt*>(BodyArg.release()); 2697 if (FunctionDecl *FD = dyn_cast_or_null<FunctionDecl>(dcl)) { 2698 FD->setBody(Body); 2699 assert(FD == getCurFunctionDecl() && "Function parsing confused"); 2700 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 2701 MD->setBody((Stmt*)Body); 2702 } else { 2703 Body->Destroy(Context); 2704 return 0; 2705 } 2706 PopDeclContext(); 2707 // Verify and clean out per-function state. 2708 2709 // Check goto/label use. 2710 for (llvm::DenseMap<IdentifierInfo*, LabelStmt*>::iterator 2711 I = LabelMap.begin(), E = LabelMap.end(); I != E; ++I) { 2712 // Verify that we have no forward references left. If so, there was a goto 2713 // or address of a label taken, but no definition of it. Label fwd 2714 // definitions are indicated with a null substmt. 2715 if (I->second->getSubStmt() == 0) { 2716 LabelStmt *L = I->second; 2717 // Emit error. 2718 Diag(L->getIdentLoc(), diag::err_undeclared_label_use) << L->getName(); 2719 2720 // At this point, we have gotos that use the bogus label. Stitch it into 2721 // the function body so that they aren't leaked and that the AST is well 2722 // formed. 2723 if (Body) { 2724#if 0 2725 // FIXME: Why do this? Having a 'push_back' in CompoundStmt is ugly, 2726 // and the AST is malformed anyway. We should just blow away 'L'. 2727 L->setSubStmt(new (Context) NullStmt(L->getIdentLoc())); 2728 cast<CompoundStmt>(Body)->push_back(L); 2729#else 2730 L->Destroy(Context); 2731#endif 2732 } else { 2733 // The whole function wasn't parsed correctly, just delete this. 2734 L->Destroy(Context); 2735 } 2736 } 2737 } 2738 LabelMap.clear(); 2739 2740 return D; 2741} 2742 2743/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 2744/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 2745NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 2746 IdentifierInfo &II, Scope *S) { 2747 // Extension in C99. Legal in C90, but warn about it. 2748 if (getLangOptions().C99) 2749 Diag(Loc, diag::ext_implicit_function_decl) << &II; 2750 else 2751 Diag(Loc, diag::warn_implicit_function_decl) << &II; 2752 2753 // FIXME: handle stuff like: 2754 // void foo() { extern float X(); } 2755 // void bar() { X(); } <-- implicit decl for X in another scope. 2756 2757 // Set a Declarator for the implicit definition: int foo(); 2758 const char *Dummy; 2759 DeclSpec DS; 2760 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy); 2761 Error = Error; // Silence warning. 2762 assert(!Error && "Error setting up implicit decl!"); 2763 Declarator D(DS, Declarator::BlockContext); 2764 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, 0, 0, 0, Loc, D)); 2765 D.SetIdentifier(&II, Loc); 2766 2767 // Insert this function into translation-unit scope. 2768 2769 DeclContext *PrevDC = CurContext; 2770 CurContext = Context.getTranslationUnitDecl(); 2771 2772 FunctionDecl *FD = 2773 dyn_cast<FunctionDecl>(static_cast<Decl*>(ActOnDeclarator(TUScope, D, 0))); 2774 FD->setImplicit(); 2775 2776 CurContext = PrevDC; 2777 2778 return FD; 2779} 2780 2781 2782TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 2783 Decl *LastDeclarator) { 2784 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 2785 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 2786 2787 // Scope manipulation handled by caller. 2788 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 2789 D.getIdentifierLoc(), 2790 D.getIdentifier(), 2791 T); 2792 NewTD->setNextDeclarator(LastDeclarator); 2793 if (D.getInvalidType()) 2794 NewTD->setInvalidDecl(); 2795 return NewTD; 2796} 2797 2798/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 2799/// former case, Name will be non-null. In the later case, Name will be null. 2800/// TagSpec indicates what kind of tag this is. TK indicates whether this is a 2801/// reference/declaration/definition of a tag. 2802Sema::DeclTy *Sema::ActOnTag(Scope *S, unsigned TagSpec, TagKind TK, 2803 SourceLocation KWLoc, const CXXScopeSpec &SS, 2804 IdentifierInfo *Name, SourceLocation NameLoc, 2805 AttributeList *Attr) { 2806 // If this is not a definition, it must have a name. 2807 assert((Name != 0 || TK == TK_Definition) && 2808 "Nameless record must be a definition!"); 2809 2810 TagDecl::TagKind Kind; 2811 switch (TagSpec) { 2812 default: assert(0 && "Unknown tag type!"); 2813 case DeclSpec::TST_struct: Kind = TagDecl::TK_struct; break; 2814 case DeclSpec::TST_union: Kind = TagDecl::TK_union; break; 2815 case DeclSpec::TST_class: Kind = TagDecl::TK_class; break; 2816 case DeclSpec::TST_enum: Kind = TagDecl::TK_enum; break; 2817 } 2818 2819 DeclContext *SearchDC = CurContext; 2820 DeclContext *DC = CurContext; 2821 NamedDecl *PrevDecl = 0; 2822 2823 bool Invalid = false; 2824 2825 if (Name && SS.isNotEmpty()) { 2826 // We have a nested-name tag ('struct foo::bar'). 2827 2828 // Check for invalid 'foo::'. 2829 if (SS.isInvalid()) { 2830 Name = 0; 2831 goto CreateNewDecl; 2832 } 2833 2834 DC = static_cast<DeclContext*>(SS.getScopeRep()); 2835 SearchDC = DC; 2836 // Look-up name inside 'foo::'. 2837 PrevDecl = dyn_cast_or_null<TagDecl>( 2838 LookupQualifiedName(DC, Name, LookupTagName, true).getAsDecl()); 2839 2840 // A tag 'foo::bar' must already exist. 2841 if (PrevDecl == 0) { 2842 Diag(NameLoc, diag::err_not_tag_in_scope) << Name << SS.getRange(); 2843 Name = 0; 2844 goto CreateNewDecl; 2845 } 2846 } else if (Name) { 2847 // If this is a named struct, check to see if there was a previous forward 2848 // declaration or definition. 2849 // FIXME: We're looking into outer scopes here, even when we 2850 // shouldn't be. Doing so can result in ambiguities that we 2851 // shouldn't be diagnosing. 2852 LookupResult R = LookupName(S, Name, LookupTagName, 2853 /*RedeclarationOnly=*/(TK != TK_Reference)); 2854 if (R.isAmbiguous()) { 2855 DiagnoseAmbiguousLookup(R, Name, NameLoc); 2856 // FIXME: This is not best way to recover from case like: 2857 // 2858 // struct S s; 2859 // 2860 // causes needless err_ovl_no_viable_function_in_init latter. 2861 Name = 0; 2862 PrevDecl = 0; 2863 Invalid = true; 2864 } 2865 else 2866 PrevDecl = R; 2867 2868 if (!getLangOptions().CPlusPlus && TK != TK_Reference) { 2869 // FIXME: This makes sure that we ignore the contexts associated 2870 // with C structs, unions, and enums when looking for a matching 2871 // tag declaration or definition. See the similar lookup tweak 2872 // in Sema::LookupName; is there a better way to deal with this? 2873 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 2874 SearchDC = SearchDC->getParent(); 2875 } 2876 } 2877 2878 if (PrevDecl && PrevDecl->isTemplateParameter()) { 2879 // Maybe we will complain about the shadowed template parameter. 2880 DiagnoseTemplateParameterShadow(NameLoc, PrevDecl); 2881 // Just pretend that we didn't see the previous declaration. 2882 PrevDecl = 0; 2883 } 2884 2885 if (PrevDecl) { 2886 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 2887 // If this is a use of a previous tag, or if the tag is already declared 2888 // in the same scope (so that the definition/declaration completes or 2889 // rementions the tag), reuse the decl. 2890 if (TK == TK_Reference || isDeclInScope(PrevDecl, SearchDC, S)) { 2891 // Make sure that this wasn't declared as an enum and now used as a 2892 // struct or something similar. 2893 if (PrevTagDecl->getTagKind() != Kind) { 2894 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 2895 Diag(PrevDecl->getLocation(), diag::note_previous_use); 2896 // Recover by making this an anonymous redefinition. 2897 Name = 0; 2898 PrevDecl = 0; 2899 Invalid = true; 2900 } else { 2901 // If this is a use, just return the declaration we found. 2902 2903 // FIXME: In the future, return a variant or some other clue 2904 // for the consumer of this Decl to know it doesn't own it. 2905 // For our current ASTs this shouldn't be a problem, but will 2906 // need to be changed with DeclGroups. 2907 if (TK == TK_Reference) 2908 return PrevDecl; 2909 2910 // Diagnose attempts to redefine a tag. 2911 if (TK == TK_Definition) { 2912 if (TagDecl *Def = PrevTagDecl->getDefinition(Context)) { 2913 Diag(NameLoc, diag::err_redefinition) << Name; 2914 Diag(Def->getLocation(), diag::note_previous_definition); 2915 // If this is a redefinition, recover by making this 2916 // struct be anonymous, which will make any later 2917 // references get the previous definition. 2918 Name = 0; 2919 PrevDecl = 0; 2920 Invalid = true; 2921 } else { 2922 // If the type is currently being defined, complain 2923 // about a nested redefinition. 2924 TagType *Tag = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 2925 if (Tag->isBeingDefined()) { 2926 Diag(NameLoc, diag::err_nested_redefinition) << Name; 2927 Diag(PrevTagDecl->getLocation(), 2928 diag::note_previous_definition); 2929 Name = 0; 2930 PrevDecl = 0; 2931 Invalid = true; 2932 } 2933 } 2934 2935 // Okay, this is definition of a previously declared or referenced 2936 // tag PrevDecl. We're going to create a new Decl for it. 2937 } 2938 } 2939 // If we get here we have (another) forward declaration or we 2940 // have a definition. Just create a new decl. 2941 } else { 2942 // If we get here, this is a definition of a new tag type in a nested 2943 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 2944 // new decl/type. We set PrevDecl to NULL so that the entities 2945 // have distinct types. 2946 PrevDecl = 0; 2947 } 2948 // If we get here, we're going to create a new Decl. If PrevDecl 2949 // is non-NULL, it's a definition of the tag declared by 2950 // PrevDecl. If it's NULL, we have a new definition. 2951 } else { 2952 // PrevDecl is a namespace, template, or anything else 2953 // that lives in the IDNS_Tag identifier namespace. 2954 if (isDeclInScope(PrevDecl, SearchDC, S)) { 2955 // The tag name clashes with a namespace name, issue an error and 2956 // recover by making this tag be anonymous. 2957 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 2958 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 2959 Name = 0; 2960 PrevDecl = 0; 2961 Invalid = true; 2962 } else { 2963 // The existing declaration isn't relevant to us; we're in a 2964 // new scope, so clear out the previous declaration. 2965 PrevDecl = 0; 2966 } 2967 } 2968 } else if (TK == TK_Reference && SS.isEmpty() && Name && 2969 (Kind != TagDecl::TK_enum)) { 2970 // C++ [basic.scope.pdecl]p5: 2971 // -- for an elaborated-type-specifier of the form 2972 // 2973 // class-key identifier 2974 // 2975 // if the elaborated-type-specifier is used in the 2976 // decl-specifier-seq or parameter-declaration-clause of a 2977 // function defined in namespace scope, the identifier is 2978 // declared as a class-name in the namespace that contains 2979 // the declaration; otherwise, except as a friend 2980 // declaration, the identifier is declared in the smallest 2981 // non-class, non-function-prototype scope that contains the 2982 // declaration. 2983 // 2984 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 2985 // C structs and unions. 2986 2987 // Find the context where we'll be declaring the tag. 2988 // FIXME: We would like to maintain the current DeclContext as the 2989 // lexical context, 2990 while (SearchDC->isRecord()) 2991 SearchDC = SearchDC->getParent(); 2992 2993 // Find the scope where we'll be declaring the tag. 2994 while (S->isClassScope() || 2995 (getLangOptions().CPlusPlus && S->isFunctionPrototypeScope()) || 2996 ((S->getFlags() & Scope::DeclScope) == 0) || 2997 (S->getEntity() && 2998 ((DeclContext *)S->getEntity())->isTransparentContext())) 2999 S = S->getParent(); 3000 } 3001 3002CreateNewDecl: 3003 3004 // If there is an identifier, use the location of the identifier as the 3005 // location of the decl, otherwise use the location of the struct/union 3006 // keyword. 3007 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 3008 3009 // Otherwise, create a new declaration. If there is a previous 3010 // declaration of the same entity, the two will be linked via 3011 // PrevDecl. 3012 TagDecl *New; 3013 3014 if (Kind == TagDecl::TK_enum) { 3015 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 3016 // enum X { A, B, C } D; D should chain to X. 3017 New = EnumDecl::Create(Context, SearchDC, Loc, Name, 3018 cast_or_null<EnumDecl>(PrevDecl)); 3019 // If this is an undefined enum, warn. 3020 if (TK != TK_Definition) Diag(Loc, diag::ext_forward_ref_enum); 3021 } else { 3022 // struct/union/class 3023 3024 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 3025 // struct X { int A; } D; D should chain to X. 3026 if (getLangOptions().CPlusPlus) 3027 // FIXME: Look for a way to use RecordDecl for simple structs. 3028 New = CXXRecordDecl::Create(Context, Kind, SearchDC, Loc, Name, 3029 cast_or_null<CXXRecordDecl>(PrevDecl)); 3030 else 3031 New = RecordDecl::Create(Context, Kind, SearchDC, Loc, Name, 3032 cast_or_null<RecordDecl>(PrevDecl)); 3033 } 3034 3035 if (Kind != TagDecl::TK_enum) { 3036 // Handle #pragma pack: if the #pragma pack stack has non-default 3037 // alignment, make up a packed attribute for this decl. These 3038 // attributes are checked when the ASTContext lays out the 3039 // structure. 3040 // 3041 // It is important for implementing the correct semantics that this 3042 // happen here (in act on tag decl). The #pragma pack stack is 3043 // maintained as a result of parser callbacks which can occur at 3044 // many points during the parsing of a struct declaration (because 3045 // the #pragma tokens are effectively skipped over during the 3046 // parsing of the struct). 3047 if (unsigned Alignment = PackContext.getAlignment()) 3048 New->addAttr(new PackedAttr(Alignment * 8)); 3049 } 3050 3051 if (getLangOptions().CPlusPlus && SS.isEmpty() && Name && !Invalid) { 3052 // C++ [dcl.typedef]p3: 3053 // [...] Similarly, in a given scope, a class or enumeration 3054 // shall not be declared with the same name as a typedef-name 3055 // that is declared in that scope and refers to a type other 3056 // than the class or enumeration itself. 3057 LookupResult Lookup = LookupName(S, Name, LookupOrdinaryName, true); 3058 TypedefDecl *PrevTypedef = 0; 3059 if (Lookup.getKind() == LookupResult::Found) 3060 PrevTypedef = dyn_cast<TypedefDecl>(Lookup.getAsDecl()); 3061 3062 if (PrevTypedef && isDeclInScope(PrevTypedef, SearchDC, S) && 3063 Context.getCanonicalType(Context.getTypeDeclType(PrevTypedef)) != 3064 Context.getCanonicalType(Context.getTypeDeclType(New))) { 3065 Diag(Loc, diag::err_tag_definition_of_typedef) 3066 << Context.getTypeDeclType(New) 3067 << PrevTypedef->getUnderlyingType(); 3068 Diag(PrevTypedef->getLocation(), diag::note_previous_definition); 3069 Invalid = true; 3070 } 3071 } 3072 3073 if (Invalid) 3074 New->setInvalidDecl(); 3075 3076 if (Attr) 3077 ProcessDeclAttributeList(New, Attr); 3078 3079 // If we're declaring or defining a tag in function prototype scope 3080 // in C, note that this type can only be used within the function. 3081 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 3082 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 3083 3084 // Set the lexical context. If the tag has a C++ scope specifier, the 3085 // lexical context will be different from the semantic context. 3086 New->setLexicalDeclContext(CurContext); 3087 3088 if (TK == TK_Definition) 3089 New->startDefinition(); 3090 3091 // If this has an identifier, add it to the scope stack. 3092 if (Name) { 3093 S = getNonFieldDeclScope(S); 3094 PushOnScopeChains(New, S); 3095 } else { 3096 CurContext->addDecl(New); 3097 } 3098 3099 return New; 3100} 3101 3102void Sema::ActOnTagStartDefinition(Scope *S, DeclTy *TagD) { 3103 AdjustDeclIfTemplate(TagD); 3104 TagDecl *Tag = cast<TagDecl>((Decl *)TagD); 3105 3106 // Enter the tag context. 3107 PushDeclContext(S, Tag); 3108 3109 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Tag)) { 3110 FieldCollector->StartClass(); 3111 3112 if (Record->getIdentifier()) { 3113 // C++ [class]p2: 3114 // [...] The class-name is also inserted into the scope of the 3115 // class itself; this is known as the injected-class-name. For 3116 // purposes of access checking, the injected-class-name is treated 3117 // as if it were a public member name. 3118 RecordDecl *InjectedClassName 3119 = CXXRecordDecl::Create(Context, Record->getTagKind(), 3120 CurContext, Record->getLocation(), 3121 Record->getIdentifier(), Record); 3122 InjectedClassName->setImplicit(); 3123 PushOnScopeChains(InjectedClassName, S); 3124 } 3125 } 3126} 3127 3128void Sema::ActOnTagFinishDefinition(Scope *S, DeclTy *TagD) { 3129 AdjustDeclIfTemplate(TagD); 3130 TagDecl *Tag = cast<TagDecl>((Decl *)TagD); 3131 3132 if (isa<CXXRecordDecl>(Tag)) 3133 FieldCollector->FinishClass(); 3134 3135 // Exit this scope of this tag's definition. 3136 PopDeclContext(); 3137 3138 // Notify the consumer that we've defined a tag. 3139 Consumer.HandleTagDeclDefinition(Tag); 3140} 3141 3142/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 3143/// types into constant array types in certain situations which would otherwise 3144/// be errors (for GCC compatibility). 3145static QualType TryToFixInvalidVariablyModifiedType(QualType T, 3146 ASTContext &Context) { 3147 // This method tries to turn a variable array into a constant 3148 // array even when the size isn't an ICE. This is necessary 3149 // for compatibility with code that depends on gcc's buggy 3150 // constant expression folding, like struct {char x[(int)(char*)2];} 3151 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 3152 if (!VLATy) return QualType(); 3153 3154 Expr::EvalResult EvalResult; 3155 if (!VLATy->getSizeExpr() || 3156 !VLATy->getSizeExpr()->Evaluate(EvalResult, Context)) 3157 return QualType(); 3158 3159 assert(EvalResult.Val.isInt() && "Size expressions must be integers!"); 3160 llvm::APSInt &Res = EvalResult.Val.getInt(); 3161 if (Res >= llvm::APSInt(Res.getBitWidth(), Res.isUnsigned())) 3162 return Context.getConstantArrayType(VLATy->getElementType(), 3163 Res, ArrayType::Normal, 0); 3164 return QualType(); 3165} 3166 3167bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName, 3168 QualType FieldTy, const Expr *BitWidth) { 3169 // FIXME: 6.7.2.1p4 - verify the field type. 3170 3171 llvm::APSInt Value; 3172 if (VerifyIntegerConstantExpression(BitWidth, &Value)) 3173 return true; 3174 3175 // Zero-width bitfield is ok for anonymous field. 3176 if (Value == 0 && FieldName) 3177 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 3178 3179 if (Value.isNegative()) 3180 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) << FieldName; 3181 3182 uint64_t TypeSize = Context.getTypeSize(FieldTy); 3183 // FIXME: We won't need the 0 size once we check that the field type is valid. 3184 if (TypeSize && Value.getZExtValue() > TypeSize) 3185 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 3186 << FieldName << (unsigned)TypeSize; 3187 3188 return false; 3189} 3190 3191/// ActOnField - Each field of a struct/union/class is passed into this in order 3192/// to create a FieldDecl object for it. 3193Sema::DeclTy *Sema::ActOnField(Scope *S, DeclTy *TagD, 3194 SourceLocation DeclStart, 3195 Declarator &D, ExprTy *BitfieldWidth) { 3196 IdentifierInfo *II = D.getIdentifier(); 3197 Expr *BitWidth = (Expr*)BitfieldWidth; 3198 SourceLocation Loc = DeclStart; 3199 RecordDecl *Record = (RecordDecl *)TagD; 3200 if (II) Loc = D.getIdentifierLoc(); 3201 3202 // FIXME: Unnamed fields can be handled in various different ways, for 3203 // example, unnamed unions inject all members into the struct namespace! 3204 3205 QualType T = GetTypeForDeclarator(D, S); 3206 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 3207 bool InvalidDecl = false; 3208 3209 // C99 6.7.2.1p8: A member of a structure or union may have any type other 3210 // than a variably modified type. 3211 if (T->isVariablyModifiedType()) { 3212 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context); 3213 if (!FixedTy.isNull()) { 3214 Diag(Loc, diag::warn_illegal_constant_array_size); 3215 T = FixedTy; 3216 } else { 3217 Diag(Loc, diag::err_typecheck_field_variable_size); 3218 T = Context.IntTy; 3219 InvalidDecl = true; 3220 } 3221 } 3222 3223 if (BitWidth) { 3224 if (VerifyBitField(Loc, II, T, BitWidth)) 3225 InvalidDecl = true; 3226 } else { 3227 // Not a bitfield. 3228 3229 // validate II. 3230 3231 } 3232 3233 // FIXME: Chain fielddecls together. 3234 FieldDecl *NewFD; 3235 3236 NewFD = FieldDecl::Create(Context, Record, 3237 Loc, II, T, BitWidth, 3238 D.getDeclSpec().getStorageClassSpec() == 3239 DeclSpec::SCS_mutable); 3240 3241 if (II) { 3242 NamedDecl *PrevDecl = LookupName(S, II, LookupMemberName, true); 3243 if (PrevDecl && isDeclInScope(PrevDecl, CurContext, S) 3244 && !isa<TagDecl>(PrevDecl)) { 3245 Diag(Loc, diag::err_duplicate_member) << II; 3246 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 3247 NewFD->setInvalidDecl(); 3248 Record->setInvalidDecl(); 3249 } 3250 } 3251 3252 if (getLangOptions().CPlusPlus) { 3253 CheckExtraCXXDefaultArguments(D); 3254 if (!T->isPODType()) 3255 cast<CXXRecordDecl>(Record)->setPOD(false); 3256 } 3257 3258 ProcessDeclAttributes(NewFD, D); 3259 3260 if (D.getInvalidType() || InvalidDecl) 3261 NewFD->setInvalidDecl(); 3262 3263 if (II) { 3264 PushOnScopeChains(NewFD, S); 3265 } else 3266 Record->addDecl(NewFD); 3267 3268 return NewFD; 3269} 3270 3271/// TranslateIvarVisibility - Translate visibility from a token ID to an 3272/// AST enum value. 3273static ObjCIvarDecl::AccessControl 3274TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 3275 switch (ivarVisibility) { 3276 default: assert(0 && "Unknown visitibility kind"); 3277 case tok::objc_private: return ObjCIvarDecl::Private; 3278 case tok::objc_public: return ObjCIvarDecl::Public; 3279 case tok::objc_protected: return ObjCIvarDecl::Protected; 3280 case tok::objc_package: return ObjCIvarDecl::Package; 3281 } 3282} 3283 3284/// ActOnIvar - Each ivar field of an objective-c class is passed into this 3285/// in order to create an IvarDecl object for it. 3286Sema::DeclTy *Sema::ActOnIvar(Scope *S, 3287 SourceLocation DeclStart, 3288 Declarator &D, ExprTy *BitfieldWidth, 3289 tok::ObjCKeywordKind Visibility) { 3290 3291 IdentifierInfo *II = D.getIdentifier(); 3292 Expr *BitWidth = (Expr*)BitfieldWidth; 3293 SourceLocation Loc = DeclStart; 3294 if (II) Loc = D.getIdentifierLoc(); 3295 3296 // FIXME: Unnamed fields can be handled in various different ways, for 3297 // example, unnamed unions inject all members into the struct namespace! 3298 3299 QualType T = GetTypeForDeclarator(D, S); 3300 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 3301 bool InvalidDecl = false; 3302 3303 if (BitWidth) { 3304 // TODO: Validate. 3305 //printf("WARNING: BITFIELDS IGNORED!\n"); 3306 3307 // 6.7.2.1p3 3308 // 6.7.2.1p4 3309 3310 } else { 3311 // Not a bitfield. 3312 3313 // validate II. 3314 3315 } 3316 3317 // C99 6.7.2.1p8: A member of a structure or union may have any type other 3318 // than a variably modified type. 3319 if (T->isVariablyModifiedType()) { 3320 Diag(Loc, diag::err_typecheck_ivar_variable_size); 3321 InvalidDecl = true; 3322 } 3323 3324 // Get the visibility (access control) for this ivar. 3325 ObjCIvarDecl::AccessControl ac = 3326 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 3327 : ObjCIvarDecl::None; 3328 3329 // Construct the decl. 3330 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, Loc, II, T, ac, 3331 (Expr *)BitfieldWidth); 3332 3333 if (II) { 3334 NamedDecl *PrevDecl = LookupName(S, II, LookupMemberName, true); 3335 if (PrevDecl && isDeclInScope(PrevDecl, CurContext, S) 3336 && !isa<TagDecl>(PrevDecl)) { 3337 Diag(Loc, diag::err_duplicate_member) << II; 3338 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 3339 NewID->setInvalidDecl(); 3340 } 3341 } 3342 3343 // Process attributes attached to the ivar. 3344 ProcessDeclAttributes(NewID, D); 3345 3346 if (D.getInvalidType() || InvalidDecl) 3347 NewID->setInvalidDecl(); 3348 3349 if (II) { 3350 // FIXME: When interfaces are DeclContexts, we'll need to add 3351 // these to the interface. 3352 S->AddDecl(NewID); 3353 IdResolver.AddDecl(NewID); 3354 } 3355 3356 return NewID; 3357} 3358 3359void Sema::ActOnFields(Scope* S, 3360 SourceLocation RecLoc, DeclTy *RecDecl, 3361 DeclTy **Fields, unsigned NumFields, 3362 SourceLocation LBrac, SourceLocation RBrac, 3363 AttributeList *Attr) { 3364 Decl *EnclosingDecl = static_cast<Decl*>(RecDecl); 3365 assert(EnclosingDecl && "missing record or interface decl"); 3366 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 3367 3368 // Verify that all the fields are okay. 3369 unsigned NumNamedMembers = 0; 3370 llvm::SmallVector<FieldDecl*, 32> RecFields; 3371 3372 for (unsigned i = 0; i != NumFields; ++i) { 3373 FieldDecl *FD = cast_or_null<FieldDecl>(static_cast<Decl*>(Fields[i])); 3374 assert(FD && "missing field decl"); 3375 3376 // Get the type for the field. 3377 Type *FDTy = FD->getType().getTypePtr(); 3378 3379 if (!FD->isAnonymousStructOrUnion()) { 3380 // Remember all fields written by the user. 3381 RecFields.push_back(FD); 3382 } 3383 3384 // C99 6.7.2.1p2 - A field may not be a function type. 3385 if (FDTy->isFunctionType()) { 3386 Diag(FD->getLocation(), diag::err_field_declared_as_function) 3387 << FD->getDeclName(); 3388 FD->setInvalidDecl(); 3389 EnclosingDecl->setInvalidDecl(); 3390 continue; 3391 } 3392 // C99 6.7.2.1p2 - A field may not be an incomplete type except... 3393 if (FDTy->isIncompleteType()) { 3394 if (!Record) { // Incomplete ivar type is always an error. 3395 DiagnoseIncompleteType(FD->getLocation(), FD->getType(), 3396 diag::err_field_incomplete); 3397 FD->setInvalidDecl(); 3398 EnclosingDecl->setInvalidDecl(); 3399 continue; 3400 } 3401 if (i != NumFields-1 || // ... that the last member ... 3402 !Record->isStruct() || // ... of a structure ... 3403 !FDTy->isArrayType()) { //... may have incomplete array type. 3404 DiagnoseIncompleteType(FD->getLocation(), FD->getType(), 3405 diag::err_field_incomplete); 3406 FD->setInvalidDecl(); 3407 EnclosingDecl->setInvalidDecl(); 3408 continue; 3409 } 3410 if (NumNamedMembers < 1) { //... must have more than named member ... 3411 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 3412 << FD->getDeclName(); 3413 FD->setInvalidDecl(); 3414 EnclosingDecl->setInvalidDecl(); 3415 continue; 3416 } 3417 // Okay, we have a legal flexible array member at the end of the struct. 3418 if (Record) 3419 Record->setHasFlexibleArrayMember(true); 3420 } 3421 /// C99 6.7.2.1p2 - a struct ending in a flexible array member cannot be the 3422 /// field of another structure or the element of an array. 3423 if (const RecordType *FDTTy = FDTy->getAsRecordType()) { 3424 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 3425 // If this is a member of a union, then entire union becomes "flexible". 3426 if (Record && Record->isUnion()) { 3427 Record->setHasFlexibleArrayMember(true); 3428 } else { 3429 // If this is a struct/class and this is not the last element, reject 3430 // it. Note that GCC supports variable sized arrays in the middle of 3431 // structures. 3432 if (i != NumFields-1) { 3433 Diag(FD->getLocation(), diag::err_variable_sized_type_in_struct) 3434 << FD->getDeclName(); 3435 FD->setInvalidDecl(); 3436 EnclosingDecl->setInvalidDecl(); 3437 continue; 3438 } 3439 // We support flexible arrays at the end of structs in other structs 3440 // as an extension. 3441 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 3442 << FD->getDeclName(); 3443 if (Record) 3444 Record->setHasFlexibleArrayMember(true); 3445 } 3446 } 3447 } 3448 /// A field cannot be an Objective-c object 3449 if (FDTy->isObjCInterfaceType()) { 3450 Diag(FD->getLocation(), diag::err_statically_allocated_object) 3451 << FD->getDeclName(); 3452 FD->setInvalidDecl(); 3453 EnclosingDecl->setInvalidDecl(); 3454 continue; 3455 } 3456 // Keep track of the number of named members. 3457 if (FD->getIdentifier()) 3458 ++NumNamedMembers; 3459 } 3460 3461 // Okay, we successfully defined 'Record'. 3462 if (Record) { 3463 Record->completeDefinition(Context); 3464 } else { 3465 ObjCIvarDecl **ClsFields = reinterpret_cast<ObjCIvarDecl**>(&RecFields[0]); 3466 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 3467 ID->addInstanceVariablesToClass(ClsFields, RecFields.size(), RBrac); 3468 // Must enforce the rule that ivars in the base classes may not be 3469 // duplicates. 3470 if (ID->getSuperClass()) { 3471 for (ObjCInterfaceDecl::ivar_iterator IVI = ID->ivar_begin(), 3472 IVE = ID->ivar_end(); IVI != IVE; ++IVI) { 3473 ObjCIvarDecl* Ivar = (*IVI); 3474 IdentifierInfo *II = Ivar->getIdentifier(); 3475 ObjCIvarDecl* prevIvar = ID->getSuperClass()->FindIvarDeclaration(II); 3476 if (prevIvar) { 3477 Diag(Ivar->getLocation(), diag::err_duplicate_member) << II; 3478 Diag(prevIvar->getLocation(), diag::note_previous_declaration); 3479 } 3480 } 3481 } 3482 } 3483 else if (ObjCImplementationDecl *IMPDecl = 3484 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 3485 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 3486 IMPDecl->ObjCAddInstanceVariablesToClassImpl(ClsFields, RecFields.size()); 3487 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 3488 } 3489 } 3490 3491 if (Attr) 3492 ProcessDeclAttributeList(Record, Attr); 3493} 3494 3495Sema::DeclTy *Sema::ActOnEnumConstant(Scope *S, DeclTy *theEnumDecl, 3496 DeclTy *lastEnumConst, 3497 SourceLocation IdLoc, IdentifierInfo *Id, 3498 SourceLocation EqualLoc, ExprTy *val) { 3499 EnumDecl *TheEnumDecl = cast<EnumDecl>(static_cast<Decl*>(theEnumDecl)); 3500 EnumConstantDecl *LastEnumConst = 3501 cast_or_null<EnumConstantDecl>(static_cast<Decl*>(lastEnumConst)); 3502 Expr *Val = static_cast<Expr*>(val); 3503 3504 // The scope passed in may not be a decl scope. Zip up the scope tree until 3505 // we find one that is. 3506 S = getNonFieldDeclScope(S); 3507 3508 // Verify that there isn't already something declared with this name in this 3509 // scope. 3510 NamedDecl *PrevDecl = LookupName(S, Id, LookupOrdinaryName); 3511 if (PrevDecl && PrevDecl->isTemplateParameter()) { 3512 // Maybe we will complain about the shadowed template parameter. 3513 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 3514 // Just pretend that we didn't see the previous declaration. 3515 PrevDecl = 0; 3516 } 3517 3518 if (PrevDecl) { 3519 // When in C++, we may get a TagDecl with the same name; in this case the 3520 // enum constant will 'hide' the tag. 3521 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 3522 "Received TagDecl when not in C++!"); 3523 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 3524 if (isa<EnumConstantDecl>(PrevDecl)) 3525 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 3526 else 3527 Diag(IdLoc, diag::err_redefinition) << Id; 3528 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 3529 Val->Destroy(Context); 3530 return 0; 3531 } 3532 } 3533 3534 llvm::APSInt EnumVal(32); 3535 QualType EltTy; 3536 if (Val) { 3537 // Make sure to promote the operand type to int. 3538 UsualUnaryConversions(Val); 3539 3540 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 3541 SourceLocation ExpLoc; 3542 if (VerifyIntegerConstantExpression(Val, &EnumVal)) { 3543 Val->Destroy(Context); 3544 Val = 0; // Just forget about it. 3545 } else { 3546 EltTy = Val->getType(); 3547 } 3548 } 3549 3550 if (!Val) { 3551 if (LastEnumConst) { 3552 // Assign the last value + 1. 3553 EnumVal = LastEnumConst->getInitVal(); 3554 ++EnumVal; 3555 3556 // Check for overflow on increment. 3557 if (EnumVal < LastEnumConst->getInitVal()) 3558 Diag(IdLoc, diag::warn_enum_value_overflow); 3559 3560 EltTy = LastEnumConst->getType(); 3561 } else { 3562 // First value, set to zero. 3563 EltTy = Context.IntTy; 3564 EnumVal.zextOrTrunc(static_cast<uint32_t>(Context.getTypeSize(EltTy))); 3565 } 3566 } 3567 3568 EnumConstantDecl *New = 3569 EnumConstantDecl::Create(Context, TheEnumDecl, IdLoc, Id, EltTy, 3570 Val, EnumVal); 3571 3572 // Register this decl in the current scope stack. 3573 PushOnScopeChains(New, S); 3574 3575 return New; 3576} 3577 3578// FIXME: For consistency with ActOnFields(), we should have the parser 3579// pass in the source location for the left/right braces. 3580void Sema::ActOnEnumBody(SourceLocation EnumLoc, DeclTy *EnumDeclX, 3581 DeclTy **Elements, unsigned NumElements) { 3582 EnumDecl *Enum = cast<EnumDecl>(static_cast<Decl*>(EnumDeclX)); 3583 QualType EnumType = Context.getTypeDeclType(Enum); 3584 3585 // TODO: If the result value doesn't fit in an int, it must be a long or long 3586 // long value. ISO C does not support this, but GCC does as an extension, 3587 // emit a warning. 3588 unsigned IntWidth = Context.Target.getIntWidth(); 3589 3590 // Verify that all the values are okay, compute the size of the values, and 3591 // reverse the list. 3592 unsigned NumNegativeBits = 0; 3593 unsigned NumPositiveBits = 0; 3594 3595 // Keep track of whether all elements have type int. 3596 bool AllElementsInt = true; 3597 3598 for (unsigned i = 0; i != NumElements; ++i) { 3599 EnumConstantDecl *ECD = 3600 cast_or_null<EnumConstantDecl>(static_cast<Decl*>(Elements[i])); 3601 if (!ECD) continue; // Already issued a diagnostic. 3602 3603 // If the enum value doesn't fit in an int, emit an extension warning. 3604 const llvm::APSInt &InitVal = ECD->getInitVal(); 3605 assert(InitVal.getBitWidth() >= IntWidth && 3606 "Should have promoted value to int"); 3607 if (InitVal.getBitWidth() > IntWidth) { 3608 llvm::APSInt V(InitVal); 3609 V.trunc(IntWidth); 3610 V.extend(InitVal.getBitWidth()); 3611 if (V != InitVal) 3612 Diag(ECD->getLocation(), diag::ext_enum_value_not_int) 3613 << InitVal.toString(10); 3614 } 3615 3616 // Keep track of the size of positive and negative values. 3617 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 3618 NumPositiveBits = std::max(NumPositiveBits, 3619 (unsigned)InitVal.getActiveBits()); 3620 else 3621 NumNegativeBits = std::max(NumNegativeBits, 3622 (unsigned)InitVal.getMinSignedBits()); 3623 3624 // Keep track of whether every enum element has type int (very commmon). 3625 if (AllElementsInt) 3626 AllElementsInt = ECD->getType() == Context.IntTy; 3627 } 3628 3629 // Figure out the type that should be used for this enum. 3630 // FIXME: Support attribute(packed) on enums and -fshort-enums. 3631 QualType BestType; 3632 unsigned BestWidth; 3633 3634 if (NumNegativeBits) { 3635 // If there is a negative value, figure out the smallest integer type (of 3636 // int/long/longlong) that fits. 3637 if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 3638 BestType = Context.IntTy; 3639 BestWidth = IntWidth; 3640 } else { 3641 BestWidth = Context.Target.getLongWidth(); 3642 3643 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) 3644 BestType = Context.LongTy; 3645 else { 3646 BestWidth = Context.Target.getLongLongWidth(); 3647 3648 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 3649 Diag(Enum->getLocation(), diag::warn_enum_too_large); 3650 BestType = Context.LongLongTy; 3651 } 3652 } 3653 } else { 3654 // If there is no negative value, figure out which of uint, ulong, ulonglong 3655 // fits. 3656 if (NumPositiveBits <= IntWidth) { 3657 BestType = Context.UnsignedIntTy; 3658 BestWidth = IntWidth; 3659 } else if (NumPositiveBits <= 3660 (BestWidth = Context.Target.getLongWidth())) { 3661 BestType = Context.UnsignedLongTy; 3662 } else { 3663 BestWidth = Context.Target.getLongLongWidth(); 3664 assert(NumPositiveBits <= BestWidth && 3665 "How could an initializer get larger than ULL?"); 3666 BestType = Context.UnsignedLongLongTy; 3667 } 3668 } 3669 3670 // Loop over all of the enumerator constants, changing their types to match 3671 // the type of the enum if needed. 3672 for (unsigned i = 0; i != NumElements; ++i) { 3673 EnumConstantDecl *ECD = 3674 cast_or_null<EnumConstantDecl>(static_cast<Decl*>(Elements[i])); 3675 if (!ECD) continue; // Already issued a diagnostic. 3676 3677 // Standard C says the enumerators have int type, but we allow, as an 3678 // extension, the enumerators to be larger than int size. If each 3679 // enumerator value fits in an int, type it as an int, otherwise type it the 3680 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 3681 // that X has type 'int', not 'unsigned'. 3682 if (ECD->getType() == Context.IntTy) { 3683 // Make sure the init value is signed. 3684 llvm::APSInt IV = ECD->getInitVal(); 3685 IV.setIsSigned(true); 3686 ECD->setInitVal(IV); 3687 3688 if (getLangOptions().CPlusPlus) 3689 // C++ [dcl.enum]p4: Following the closing brace of an 3690 // enum-specifier, each enumerator has the type of its 3691 // enumeration. 3692 ECD->setType(EnumType); 3693 continue; // Already int type. 3694 } 3695 3696 // Determine whether the value fits into an int. 3697 llvm::APSInt InitVal = ECD->getInitVal(); 3698 bool FitsInInt; 3699 if (InitVal.isUnsigned() || !InitVal.isNegative()) 3700 FitsInInt = InitVal.getActiveBits() < IntWidth; 3701 else 3702 FitsInInt = InitVal.getMinSignedBits() <= IntWidth; 3703 3704 // If it fits into an integer type, force it. Otherwise force it to match 3705 // the enum decl type. 3706 QualType NewTy; 3707 unsigned NewWidth; 3708 bool NewSign; 3709 if (FitsInInt) { 3710 NewTy = Context.IntTy; 3711 NewWidth = IntWidth; 3712 NewSign = true; 3713 } else if (ECD->getType() == BestType) { 3714 // Already the right type! 3715 if (getLangOptions().CPlusPlus) 3716 // C++ [dcl.enum]p4: Following the closing brace of an 3717 // enum-specifier, each enumerator has the type of its 3718 // enumeration. 3719 ECD->setType(EnumType); 3720 continue; 3721 } else { 3722 NewTy = BestType; 3723 NewWidth = BestWidth; 3724 NewSign = BestType->isSignedIntegerType(); 3725 } 3726 3727 // Adjust the APSInt value. 3728 InitVal.extOrTrunc(NewWidth); 3729 InitVal.setIsSigned(NewSign); 3730 ECD->setInitVal(InitVal); 3731 3732 // Adjust the Expr initializer and type. 3733 if (ECD->getInitExpr()) 3734 ECD->setInitExpr(new (Context) ImplicitCastExpr(NewTy, ECD->getInitExpr(), 3735 /*isLvalue=*/false)); 3736 if (getLangOptions().CPlusPlus) 3737 // C++ [dcl.enum]p4: Following the closing brace of an 3738 // enum-specifier, each enumerator has the type of its 3739 // enumeration. 3740 ECD->setType(EnumType); 3741 else 3742 ECD->setType(NewTy); 3743 } 3744 3745 Enum->completeDefinition(Context, BestType); 3746} 3747 3748Sema::DeclTy *Sema::ActOnFileScopeAsmDecl(SourceLocation Loc, 3749 ExprArg expr) { 3750 StringLiteral *AsmString = cast<StringLiteral>((Expr*)expr.release()); 3751 3752 return FileScopeAsmDecl::Create(Context, CurContext, Loc, AsmString); 3753} 3754 3755 3756void Sema::ActOnPragmaPack(PragmaPackKind Kind, IdentifierInfo *Name, 3757 ExprTy *alignment, SourceLocation PragmaLoc, 3758 SourceLocation LParenLoc, SourceLocation RParenLoc) { 3759 Expr *Alignment = static_cast<Expr *>(alignment); 3760 3761 // If specified then alignment must be a "small" power of two. 3762 unsigned AlignmentVal = 0; 3763 if (Alignment) { 3764 llvm::APSInt Val; 3765 if (!Alignment->isIntegerConstantExpr(Val, Context) || 3766 !Val.isPowerOf2() || 3767 Val.getZExtValue() > 16) { 3768 Diag(PragmaLoc, diag::warn_pragma_pack_invalid_alignment); 3769 Alignment->Destroy(Context); 3770 return; // Ignore 3771 } 3772 3773 AlignmentVal = (unsigned) Val.getZExtValue(); 3774 } 3775 3776 switch (Kind) { 3777 case Action::PPK_Default: // pack([n]) 3778 PackContext.setAlignment(AlignmentVal); 3779 break; 3780 3781 case Action::PPK_Show: // pack(show) 3782 // Show the current alignment, making sure to show the right value 3783 // for the default. 3784 AlignmentVal = PackContext.getAlignment(); 3785 // FIXME: This should come from the target. 3786 if (AlignmentVal == 0) 3787 AlignmentVal = 8; 3788 Diag(PragmaLoc, diag::warn_pragma_pack_show) << AlignmentVal; 3789 break; 3790 3791 case Action::PPK_Push: // pack(push [, id] [, [n]) 3792 PackContext.push(Name); 3793 // Set the new alignment if specified. 3794 if (Alignment) 3795 PackContext.setAlignment(AlignmentVal); 3796 break; 3797 3798 case Action::PPK_Pop: // pack(pop [, id] [, n]) 3799 // MSDN, C/C++ Preprocessor Reference > Pragma Directives > pack: 3800 // "#pragma pack(pop, identifier, n) is undefined" 3801 if (Alignment && Name) 3802 Diag(PragmaLoc, diag::warn_pragma_pack_pop_identifer_and_alignment); 3803 3804 // Do the pop. 3805 if (!PackContext.pop(Name)) { 3806 // If a name was specified then failure indicates the name 3807 // wasn't found. Otherwise failure indicates the stack was 3808 // empty. 3809 Diag(PragmaLoc, diag::warn_pragma_pack_pop_failed) 3810 << (Name ? "no record matching name" : "stack empty"); 3811 3812 // FIXME: Warn about popping named records as MSVC does. 3813 } else { 3814 // Pop succeeded, set the new alignment if specified. 3815 if (Alignment) 3816 PackContext.setAlignment(AlignmentVal); 3817 } 3818 break; 3819 3820 default: 3821 assert(0 && "Invalid #pragma pack kind."); 3822 } 3823} 3824 3825bool PragmaPackStack::pop(IdentifierInfo *Name) { 3826 if (Stack.empty()) 3827 return false; 3828 3829 // If name is empty just pop top. 3830 if (!Name) { 3831 Alignment = Stack.back().first; 3832 Stack.pop_back(); 3833 return true; 3834 } 3835 3836 // Otherwise, find the named record. 3837 for (unsigned i = Stack.size(); i != 0; ) { 3838 --i; 3839 if (Stack[i].second == Name) { 3840 // Found it, pop up to and including this record. 3841 Alignment = Stack[i].first; 3842 Stack.erase(Stack.begin() + i, Stack.end()); 3843 return true; 3844 } 3845 } 3846 3847 return false; 3848} 3849