SemaDecl.cpp revision f3f8d2a52ebc0acbe6269a0302f90c21668e2404
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 "SemaInit.h" 16#include "Lookup.h" 17#include "clang/Analysis/AnalysisContext.h" 18#include "clang/AST/APValue.h" 19#include "clang/AST/ASTConsumer.h" 20#include "clang/AST/ASTContext.h" 21#include "clang/AST/CXXInheritance.h" 22#include "clang/AST/DeclTemplate.h" 23#include "clang/AST/ExprCXX.h" 24#include "clang/AST/StmtCXX.h" 25#include "clang/Parse/DeclSpec.h" 26#include "clang/Parse/ParseDiagnostic.h" 27#include "clang/Parse/Template.h" 28#include "clang/Basic/PartialDiagnostic.h" 29#include "clang/Basic/SourceManager.h" 30#include "clang/Basic/TargetInfo.h" 31// FIXME: layering (ideally, Sema shouldn't be dependent on Lex API's) 32#include "clang/Lex/Preprocessor.h" 33#include "clang/Lex/HeaderSearch.h" 34#include "llvm/ADT/Triple.h" 35#include <algorithm> 36#include <cstring> 37#include <functional> 38using namespace clang; 39 40/// getDeclName - Return a pretty name for the specified decl if possible, or 41/// an empty string if not. This is used for pretty crash reporting. 42std::string Sema::getDeclName(DeclPtrTy d) { 43 Decl *D = d.getAs<Decl>(); 44 if (NamedDecl *DN = dyn_cast_or_null<NamedDecl>(D)) 45 return DN->getQualifiedNameAsString(); 46 return ""; 47} 48 49Sema::DeclGroupPtrTy Sema::ConvertDeclToDeclGroup(DeclPtrTy Ptr) { 50 return DeclGroupPtrTy::make(DeclGroupRef(Ptr.getAs<Decl>())); 51} 52 53/// \brief If the identifier refers to a type name within this scope, 54/// return the declaration of that type. 55/// 56/// This routine performs ordinary name lookup of the identifier II 57/// within the given scope, with optional C++ scope specifier SS, to 58/// determine whether the name refers to a type. If so, returns an 59/// opaque pointer (actually a QualType) corresponding to that 60/// type. Otherwise, returns NULL. 61/// 62/// If name lookup results in an ambiguity, this routine will complain 63/// and then return NULL. 64Sema::TypeTy *Sema::getTypeName(IdentifierInfo &II, SourceLocation NameLoc, 65 Scope *S, const CXXScopeSpec *SS, 66 bool isClassName, 67 TypeTy *ObjectTypePtr) { 68 // Determine where we will perform name lookup. 69 DeclContext *LookupCtx = 0; 70 if (ObjectTypePtr) { 71 QualType ObjectType = QualType::getFromOpaquePtr(ObjectTypePtr); 72 if (ObjectType->isRecordType()) 73 LookupCtx = computeDeclContext(ObjectType); 74 } else if (SS && SS->isSet()) { 75 LookupCtx = computeDeclContext(*SS, false); 76 77 if (!LookupCtx) { 78 if (isDependentScopeSpecifier(*SS)) { 79 // C++ [temp.res]p3: 80 // A qualified-id that refers to a type and in which the 81 // nested-name-specifier depends on a template-parameter (14.6.2) 82 // shall be prefixed by the keyword typename to indicate that the 83 // qualified-id denotes a type, forming an 84 // elaborated-type-specifier (7.1.5.3). 85 // 86 // We therefore do not perform any name lookup if the result would 87 // refer to a member of an unknown specialization. 88 if (!isClassName) 89 return 0; 90 91 // We know from the grammar that this name refers to a type, so build a 92 // TypenameType node to describe the type. 93 // FIXME: Record somewhere that this TypenameType node has no "typename" 94 // keyword associated with it. 95 return CheckTypenameType((NestedNameSpecifier *)SS->getScopeRep(), 96 II, SS->getRange()).getAsOpaquePtr(); 97 } 98 99 return 0; 100 } 101 102 if (!LookupCtx->isDependentContext() && RequireCompleteDeclContext(*SS)) 103 return 0; 104 } 105 106 // FIXME: LookupNestedNameSpecifierName isn't the right kind of 107 // lookup for class-names. 108 LookupNameKind Kind = isClassName ? LookupNestedNameSpecifierName : 109 LookupOrdinaryName; 110 LookupResult Result(*this, &II, NameLoc, Kind); 111 if (LookupCtx) { 112 // Perform "qualified" name lookup into the declaration context we 113 // computed, which is either the type of the base of a member access 114 // expression or the declaration context associated with a prior 115 // nested-name-specifier. 116 LookupQualifiedName(Result, LookupCtx); 117 118 if (ObjectTypePtr && Result.empty()) { 119 // C++ [basic.lookup.classref]p3: 120 // If the unqualified-id is ~type-name, the type-name is looked up 121 // in the context of the entire postfix-expression. If the type T of 122 // the object expression is of a class type C, the type-name is also 123 // looked up in the scope of class C. At least one of the lookups shall 124 // find a name that refers to (possibly cv-qualified) T. 125 LookupName(Result, S); 126 } 127 } else { 128 // Perform unqualified name lookup. 129 LookupName(Result, S); 130 } 131 132 NamedDecl *IIDecl = 0; 133 switch (Result.getResultKind()) { 134 case LookupResult::NotFound: 135 case LookupResult::NotFoundInCurrentInstantiation: 136 case LookupResult::FoundOverloaded: 137 case LookupResult::FoundUnresolvedValue: 138 Result.suppressDiagnostics(); 139 return 0; 140 141 case LookupResult::Ambiguous: 142 // Recover from type-hiding ambiguities by hiding the type. We'll 143 // do the lookup again when looking for an object, and we can 144 // diagnose the error then. If we don't do this, then the error 145 // about hiding the type will be immediately followed by an error 146 // that only makes sense if the identifier was treated like a type. 147 if (Result.getAmbiguityKind() == LookupResult::AmbiguousTagHiding) { 148 Result.suppressDiagnostics(); 149 return 0; 150 } 151 152 // Look to see if we have a type anywhere in the list of results. 153 for (LookupResult::iterator Res = Result.begin(), ResEnd = Result.end(); 154 Res != ResEnd; ++Res) { 155 if (isa<TypeDecl>(*Res) || isa<ObjCInterfaceDecl>(*Res)) { 156 if (!IIDecl || 157 (*Res)->getLocation().getRawEncoding() < 158 IIDecl->getLocation().getRawEncoding()) 159 IIDecl = *Res; 160 } 161 } 162 163 if (!IIDecl) { 164 // None of the entities we found is a type, so there is no way 165 // to even assume that the result is a type. In this case, don't 166 // complain about the ambiguity. The parser will either try to 167 // perform this lookup again (e.g., as an object name), which 168 // will produce the ambiguity, or will complain that it expected 169 // a type name. 170 Result.suppressDiagnostics(); 171 return 0; 172 } 173 174 // We found a type within the ambiguous lookup; diagnose the 175 // ambiguity and then return that type. This might be the right 176 // answer, or it might not be, but it suppresses any attempt to 177 // perform the name lookup again. 178 break; 179 180 case LookupResult::Found: 181 IIDecl = Result.getFoundDecl(); 182 break; 183 } 184 185 assert(IIDecl && "Didn't find decl"); 186 187 QualType T; 188 if (TypeDecl *TD = dyn_cast<TypeDecl>(IIDecl)) { 189 DiagnoseUseOfDecl(IIDecl, NameLoc); 190 191 // C++ [temp.local]p2: 192 // Within the scope of a class template specialization or 193 // partial specialization, when the injected-class-name is 194 // not followed by a <, it is equivalent to the 195 // injected-class-name followed by the template-argument s 196 // of the class template specialization or partial 197 // specialization enclosed in <>. 198 if (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(TD)) 199 if (RD->isInjectedClassName()) 200 if (ClassTemplateDecl *Template = RD->getDescribedClassTemplate()) 201 T = Template->getInjectedClassNameType(Context); 202 203 if (T.isNull()) 204 T = Context.getTypeDeclType(TD); 205 206 if (SS) 207 T = getQualifiedNameType(*SS, T); 208 209 } else if (ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(IIDecl)) { 210 T = Context.getObjCInterfaceType(IDecl); 211 } else if (UnresolvedUsingTypenameDecl *UUDecl = 212 dyn_cast<UnresolvedUsingTypenameDecl>(IIDecl)) { 213 // FIXME: preserve source structure information. 214 T = Context.getTypenameType(UUDecl->getTargetNestedNameSpecifier(), &II); 215 } else { 216 // If it's not plausibly a type, suppress diagnostics. 217 Result.suppressDiagnostics(); 218 return 0; 219 } 220 221 return T.getAsOpaquePtr(); 222} 223 224/// isTagName() - This method is called *for error recovery purposes only* 225/// to determine if the specified name is a valid tag name ("struct foo"). If 226/// so, this returns the TST for the tag corresponding to it (TST_enum, 227/// TST_union, TST_struct, TST_class). This is used to diagnose cases in C 228/// where the user forgot to specify the tag. 229DeclSpec::TST Sema::isTagName(IdentifierInfo &II, Scope *S) { 230 // Do a tag name lookup in this scope. 231 LookupResult R(*this, &II, SourceLocation(), LookupTagName); 232 LookupName(R, S, false); 233 R.suppressDiagnostics(); 234 if (R.getResultKind() == LookupResult::Found) 235 if (const TagDecl *TD = R.getAsSingle<TagDecl>()) { 236 switch (TD->getTagKind()) { 237 case TagDecl::TK_struct: return DeclSpec::TST_struct; 238 case TagDecl::TK_union: return DeclSpec::TST_union; 239 case TagDecl::TK_class: return DeclSpec::TST_class; 240 case TagDecl::TK_enum: return DeclSpec::TST_enum; 241 } 242 } 243 244 return DeclSpec::TST_unspecified; 245} 246 247bool Sema::DiagnoseUnknownTypeName(const IdentifierInfo &II, 248 SourceLocation IILoc, 249 Scope *S, 250 const CXXScopeSpec *SS, 251 TypeTy *&SuggestedType) { 252 // We don't have anything to suggest (yet). 253 SuggestedType = 0; 254 255 // There may have been a typo in the name of the type. Look up typo 256 // results, in case we have something that we can suggest. 257 LookupResult Lookup(*this, &II, IILoc, LookupOrdinaryName, 258 NotForRedeclaration); 259 260 // FIXME: It would be nice if we could correct for typos in built-in 261 // names, such as "itn" for "int". 262 263 if (CorrectTypo(Lookup, S, SS) && Lookup.isSingleResult()) { 264 NamedDecl *Result = Lookup.getAsSingle<NamedDecl>(); 265 if ((isa<TypeDecl>(Result) || isa<ObjCInterfaceDecl>(Result)) && 266 !Result->isInvalidDecl()) { 267 // We found a similarly-named type or interface; suggest that. 268 if (!SS || !SS->isSet()) 269 Diag(IILoc, diag::err_unknown_typename_suggest) 270 << &II << Lookup.getLookupName() 271 << CodeModificationHint::CreateReplacement(SourceRange(IILoc), 272 Result->getNameAsString()); 273 else if (DeclContext *DC = computeDeclContext(*SS, false)) 274 Diag(IILoc, diag::err_unknown_nested_typename_suggest) 275 << &II << DC << Lookup.getLookupName() << SS->getRange() 276 << CodeModificationHint::CreateReplacement(SourceRange(IILoc), 277 Result->getNameAsString()); 278 else 279 llvm_unreachable("could not have corrected a typo here"); 280 281 Diag(Result->getLocation(), diag::note_previous_decl) 282 << Result->getDeclName(); 283 284 SuggestedType = getTypeName(*Result->getIdentifier(), IILoc, S, SS); 285 return true; 286 } 287 } 288 289 // FIXME: Should we move the logic that tries to recover from a missing tag 290 // (struct, union, enum) from Parser::ParseImplicitInt here, instead? 291 292 if (!SS || (!SS->isSet() && !SS->isInvalid())) 293 Diag(IILoc, diag::err_unknown_typename) << &II; 294 else if (DeclContext *DC = computeDeclContext(*SS, false)) 295 Diag(IILoc, diag::err_typename_nested_not_found) 296 << &II << DC << SS->getRange(); 297 else if (isDependentScopeSpecifier(*SS)) { 298 Diag(SS->getRange().getBegin(), diag::err_typename_missing) 299 << (NestedNameSpecifier *)SS->getScopeRep() << II.getName() 300 << SourceRange(SS->getRange().getBegin(), IILoc) 301 << CodeModificationHint::CreateInsertion(SS->getRange().getBegin(), 302 "typename "); 303 SuggestedType = ActOnTypenameType(SourceLocation(), *SS, II, IILoc).get(); 304 } else { 305 assert(SS && SS->isInvalid() && 306 "Invalid scope specifier has already been diagnosed"); 307 } 308 309 return true; 310} 311 312// Determines the context to return to after temporarily entering a 313// context. This depends in an unnecessarily complicated way on the 314// exact ordering of callbacks from the parser. 315DeclContext *Sema::getContainingDC(DeclContext *DC) { 316 317 // Functions defined inline within classes aren't parsed until we've 318 // finished parsing the top-level class, so the top-level class is 319 // the context we'll need to return to. 320 if (isa<FunctionDecl>(DC)) { 321 DC = DC->getLexicalParent(); 322 323 // A function not defined within a class will always return to its 324 // lexical context. 325 if (!isa<CXXRecordDecl>(DC)) 326 return DC; 327 328 // A C++ inline method/friend is parsed *after* the topmost class 329 // it was declared in is fully parsed ("complete"); the topmost 330 // class is the context we need to return to. 331 while (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC->getLexicalParent())) 332 DC = RD; 333 334 // Return the declaration context of the topmost class the inline method is 335 // declared in. 336 return DC; 337 } 338 339 if (isa<ObjCMethodDecl>(DC)) 340 return Context.getTranslationUnitDecl(); 341 342 return DC->getLexicalParent(); 343} 344 345void Sema::PushDeclContext(Scope *S, DeclContext *DC) { 346 assert(getContainingDC(DC) == CurContext && 347 "The next DeclContext should be lexically contained in the current one."); 348 CurContext = DC; 349 S->setEntity(DC); 350} 351 352void Sema::PopDeclContext() { 353 assert(CurContext && "DeclContext imbalance!"); 354 355 CurContext = getContainingDC(CurContext); 356} 357 358/// EnterDeclaratorContext - Used when we must lookup names in the context 359/// of a declarator's nested name specifier. 360/// 361void Sema::EnterDeclaratorContext(Scope *S, DeclContext *DC) { 362 // C++0x [basic.lookup.unqual]p13: 363 // A name used in the definition of a static data member of class 364 // X (after the qualified-id of the static member) is looked up as 365 // if the name was used in a member function of X. 366 // C++0x [basic.lookup.unqual]p14: 367 // If a variable member of a namespace is defined outside of the 368 // scope of its namespace then any name used in the definition of 369 // the variable member (after the declarator-id) is looked up as 370 // if the definition of the variable member occurred in its 371 // namespace. 372 // Both of these imply that we should push a scope whose context 373 // is the semantic context of the declaration. We can't use 374 // PushDeclContext here because that context is not necessarily 375 // lexically contained in the current context. Fortunately, 376 // the containing scope should have the appropriate information. 377 378 assert(!S->getEntity() && "scope already has entity"); 379 380#ifndef NDEBUG 381 Scope *Ancestor = S->getParent(); 382 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 383 assert(Ancestor->getEntity() == CurContext && "ancestor context mismatch"); 384#endif 385 386 CurContext = DC; 387 S->setEntity(DC); 388} 389 390void Sema::ExitDeclaratorContext(Scope *S) { 391 assert(S->getEntity() == CurContext && "Context imbalance!"); 392 393 // Switch back to the lexical context. The safety of this is 394 // enforced by an assert in EnterDeclaratorContext. 395 Scope *Ancestor = S->getParent(); 396 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 397 CurContext = (DeclContext*) Ancestor->getEntity(); 398 399 // We don't need to do anything with the scope, which is going to 400 // disappear. 401} 402 403/// \brief Determine whether we allow overloading of the function 404/// PrevDecl with another declaration. 405/// 406/// This routine determines whether overloading is possible, not 407/// whether some new function is actually an overload. It will return 408/// true in C++ (where we can always provide overloads) or, as an 409/// extension, in C when the previous function is already an 410/// overloaded function declaration or has the "overloadable" 411/// attribute. 412static bool AllowOverloadingOfFunction(LookupResult &Previous, 413 ASTContext &Context) { 414 if (Context.getLangOptions().CPlusPlus) 415 return true; 416 417 if (Previous.getResultKind() == LookupResult::FoundOverloaded) 418 return true; 419 420 return (Previous.getResultKind() == LookupResult::Found 421 && Previous.getFoundDecl()->hasAttr<OverloadableAttr>()); 422} 423 424/// Add this decl to the scope shadowed decl chains. 425void Sema::PushOnScopeChains(NamedDecl *D, Scope *S, bool AddToContext) { 426 // Move up the scope chain until we find the nearest enclosing 427 // non-transparent context. The declaration will be introduced into this 428 // scope. 429 while (S->getEntity() && 430 ((DeclContext *)S->getEntity())->isTransparentContext()) 431 S = S->getParent(); 432 433 // Add scoped declarations into their context, so that they can be 434 // found later. Declarations without a context won't be inserted 435 // into any context. 436 if (AddToContext) 437 CurContext->addDecl(D); 438 439 // Out-of-line function and variable definitions should not be pushed into 440 // scope. 441 if ((isa<FunctionTemplateDecl>(D) && 442 cast<FunctionTemplateDecl>(D)->getTemplatedDecl()->isOutOfLine()) || 443 (isa<FunctionDecl>(D) && 444 (cast<FunctionDecl>(D)->isFunctionTemplateSpecialization() || 445 cast<FunctionDecl>(D)->isOutOfLine())) || 446 (isa<VarDecl>(D) && cast<VarDecl>(D)->isOutOfLine())) 447 return; 448 449 // If this replaces anything in the current scope, 450 IdentifierResolver::iterator I = IdResolver.begin(D->getDeclName()), 451 IEnd = IdResolver.end(); 452 for (; I != IEnd; ++I) { 453 if (S->isDeclScope(DeclPtrTy::make(*I)) && D->declarationReplaces(*I)) { 454 S->RemoveDecl(DeclPtrTy::make(*I)); 455 IdResolver.RemoveDecl(*I); 456 457 // Should only need to replace one decl. 458 break; 459 } 460 } 461 462 S->AddDecl(DeclPtrTy::make(D)); 463 IdResolver.AddDecl(D); 464} 465 466bool Sema::isDeclInScope(NamedDecl *&D, DeclContext *Ctx, Scope *S) { 467 return IdResolver.isDeclInScope(D, Ctx, Context, S); 468} 469 470static bool isOutOfScopePreviousDeclaration(NamedDecl *, 471 DeclContext*, 472 ASTContext&); 473 474/// Filters out lookup results that don't fall within the given scope 475/// as determined by isDeclInScope. 476static void FilterLookupForScope(Sema &SemaRef, LookupResult &R, 477 DeclContext *Ctx, Scope *S, 478 bool ConsiderLinkage) { 479 LookupResult::Filter F = R.makeFilter(); 480 while (F.hasNext()) { 481 NamedDecl *D = F.next(); 482 483 if (SemaRef.isDeclInScope(D, Ctx, S)) 484 continue; 485 486 if (ConsiderLinkage && 487 isOutOfScopePreviousDeclaration(D, Ctx, SemaRef.Context)) 488 continue; 489 490 F.erase(); 491 } 492 493 F.done(); 494} 495 496static bool isUsingDecl(NamedDecl *D) { 497 return isa<UsingShadowDecl>(D) || 498 isa<UnresolvedUsingTypenameDecl>(D) || 499 isa<UnresolvedUsingValueDecl>(D); 500} 501 502/// Removes using shadow declarations from the lookup results. 503static void RemoveUsingDecls(LookupResult &R) { 504 LookupResult::Filter F = R.makeFilter(); 505 while (F.hasNext()) 506 if (isUsingDecl(F.next())) 507 F.erase(); 508 509 F.done(); 510} 511 512static bool ShouldDiagnoseUnusedDecl(const NamedDecl *D) { 513 if (D->isInvalidDecl()) 514 return false; 515 516 if (D->isUsed() || D->hasAttr<UnusedAttr>()) 517 return false; 518 519 // White-list anything that isn't a local variable. 520 if (!isa<VarDecl>(D) || isa<ParmVarDecl>(D) || isa<ImplicitParamDecl>(D) || 521 !D->getDeclContext()->isFunctionOrMethod()) 522 return false; 523 524 // Types of valid local variables should be complete, so this should succeed. 525 if (const ValueDecl *VD = dyn_cast<ValueDecl>(D)) { 526 if (const RecordType *RT = VD->getType()->getAs<RecordType>()) { 527 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl())) { 528 if (!RD->hasTrivialConstructor()) 529 return false; 530 if (!RD->hasTrivialDestructor()) 531 return false; 532 } 533 } 534 } 535 536 return true; 537} 538 539void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) { 540 if (S->decl_empty()) return; 541 assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) && 542 "Scope shouldn't contain decls!"); 543 544 for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end(); 545 I != E; ++I) { 546 Decl *TmpD = (*I).getAs<Decl>(); 547 assert(TmpD && "This decl didn't get pushed??"); 548 549 assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?"); 550 NamedDecl *D = cast<NamedDecl>(TmpD); 551 552 if (!D->getDeclName()) continue; 553 554 // Diagnose unused variables in this scope. 555 if (ShouldDiagnoseUnusedDecl(D)) 556 Diag(D->getLocation(), diag::warn_unused_variable) << D->getDeclName(); 557 558 // Remove this name from our lexical scope. 559 IdResolver.RemoveDecl(D); 560 } 561} 562 563/// getObjCInterfaceDecl - Look up a for a class declaration in the scope. 564/// return 0 if one not found. 565/// 566/// \param Id the name of the Objective-C class we're looking for. If 567/// typo-correction fixes this name, the Id will be updated 568/// to the fixed name. 569/// 570/// \param RecoverLoc if provided, this routine will attempt to 571/// recover from a typo in the name of an existing Objective-C class 572/// and, if successful, will return the lookup that results from 573/// typo-correction. 574ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *&Id, 575 SourceLocation RecoverLoc) { 576 // The third "scope" argument is 0 since we aren't enabling lazy built-in 577 // creation from this context. 578 NamedDecl *IDecl = LookupSingleName(TUScope, Id, LookupOrdinaryName); 579 580 if (!IDecl && !RecoverLoc.isInvalid()) { 581 // Perform typo correction at the given location, but only if we 582 // find an Objective-C class name. 583 LookupResult R(*this, Id, RecoverLoc, LookupOrdinaryName); 584 if (CorrectTypo(R, TUScope, 0) && 585 (IDecl = R.getAsSingle<ObjCInterfaceDecl>())) { 586 Diag(RecoverLoc, diag::err_undef_interface_suggest) 587 << Id << IDecl->getDeclName() 588 << CodeModificationHint::CreateReplacement(RecoverLoc, 589 IDecl->getNameAsString()); 590 Diag(IDecl->getLocation(), diag::note_previous_decl) 591 << IDecl->getDeclName(); 592 593 Id = IDecl->getIdentifier(); 594 } 595 } 596 597 return dyn_cast_or_null<ObjCInterfaceDecl>(IDecl); 598} 599 600/// getNonFieldDeclScope - Retrieves the innermost scope, starting 601/// from S, where a non-field would be declared. This routine copes 602/// with the difference between C and C++ scoping rules in structs and 603/// unions. For example, the following code is well-formed in C but 604/// ill-formed in C++: 605/// @code 606/// struct S6 { 607/// enum { BAR } e; 608/// }; 609/// 610/// void test_S6() { 611/// struct S6 a; 612/// a.e = BAR; 613/// } 614/// @endcode 615/// For the declaration of BAR, this routine will return a different 616/// scope. The scope S will be the scope of the unnamed enumeration 617/// within S6. In C++, this routine will return the scope associated 618/// with S6, because the enumeration's scope is a transparent 619/// context but structures can contain non-field names. In C, this 620/// routine will return the translation unit scope, since the 621/// enumeration's scope is a transparent context and structures cannot 622/// contain non-field names. 623Scope *Sema::getNonFieldDeclScope(Scope *S) { 624 while (((S->getFlags() & Scope::DeclScope) == 0) || 625 (S->getEntity() && 626 ((DeclContext *)S->getEntity())->isTransparentContext()) || 627 (S->isClassScope() && !getLangOptions().CPlusPlus)) 628 S = S->getParent(); 629 return S; 630} 631 632void Sema::InitBuiltinVaListType() { 633 if (!Context.getBuiltinVaListType().isNull()) 634 return; 635 636 IdentifierInfo *VaIdent = &Context.Idents.get("__builtin_va_list"); 637 NamedDecl *VaDecl = LookupSingleName(TUScope, VaIdent, LookupOrdinaryName); 638 TypedefDecl *VaTypedef = cast<TypedefDecl>(VaDecl); 639 Context.setBuiltinVaListType(Context.getTypedefType(VaTypedef)); 640} 641 642/// LazilyCreateBuiltin - The specified Builtin-ID was first used at 643/// file scope. lazily create a decl for it. ForRedeclaration is true 644/// if we're creating this built-in in anticipation of redeclaring the 645/// built-in. 646NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid, 647 Scope *S, bool ForRedeclaration, 648 SourceLocation Loc) { 649 Builtin::ID BID = (Builtin::ID)bid; 650 651 if (Context.BuiltinInfo.hasVAListUse(BID)) 652 InitBuiltinVaListType(); 653 654 ASTContext::GetBuiltinTypeError Error; 655 QualType R = Context.GetBuiltinType(BID, Error); 656 switch (Error) { 657 case ASTContext::GE_None: 658 // Okay 659 break; 660 661 case ASTContext::GE_Missing_stdio: 662 if (ForRedeclaration) 663 Diag(Loc, diag::err_implicit_decl_requires_stdio) 664 << Context.BuiltinInfo.GetName(BID); 665 return 0; 666 667 case ASTContext::GE_Missing_setjmp: 668 if (ForRedeclaration) 669 Diag(Loc, diag::err_implicit_decl_requires_setjmp) 670 << Context.BuiltinInfo.GetName(BID); 671 return 0; 672 } 673 674 if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) { 675 Diag(Loc, diag::ext_implicit_lib_function_decl) 676 << Context.BuiltinInfo.GetName(BID) 677 << R; 678 if (Context.BuiltinInfo.getHeaderName(BID) && 679 Diags.getDiagnosticLevel(diag::ext_implicit_lib_function_decl) 680 != Diagnostic::Ignored) 681 Diag(Loc, diag::note_please_include_header) 682 << Context.BuiltinInfo.getHeaderName(BID) 683 << Context.BuiltinInfo.GetName(BID); 684 } 685 686 FunctionDecl *New = FunctionDecl::Create(Context, 687 Context.getTranslationUnitDecl(), 688 Loc, II, R, /*TInfo=*/0, 689 FunctionDecl::Extern, false, 690 /*hasPrototype=*/true); 691 New->setImplicit(); 692 693 // Create Decl objects for each parameter, adding them to the 694 // FunctionDecl. 695 if (FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) { 696 llvm::SmallVector<ParmVarDecl*, 16> Params; 697 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) 698 Params.push_back(ParmVarDecl::Create(Context, New, SourceLocation(), 0, 699 FT->getArgType(i), /*TInfo=*/0, 700 VarDecl::None, 0)); 701 New->setParams(Params.data(), Params.size()); 702 } 703 704 AddKnownFunctionAttributes(New); 705 706 // TUScope is the translation-unit scope to insert this function into. 707 // FIXME: This is hideous. We need to teach PushOnScopeChains to 708 // relate Scopes to DeclContexts, and probably eliminate CurContext 709 // entirely, but we're not there yet. 710 DeclContext *SavedContext = CurContext; 711 CurContext = Context.getTranslationUnitDecl(); 712 PushOnScopeChains(New, TUScope); 713 CurContext = SavedContext; 714 return New; 715} 716 717/// MergeTypeDefDecl - We just parsed a typedef 'New' which has the 718/// same name and scope as a previous declaration 'Old'. Figure out 719/// how to resolve this situation, merging decls or emitting 720/// diagnostics as appropriate. If there was an error, set New to be invalid. 721/// 722void Sema::MergeTypeDefDecl(TypedefDecl *New, LookupResult &OldDecls) { 723 // If the new decl is known invalid already, don't bother doing any 724 // merging checks. 725 if (New->isInvalidDecl()) return; 726 727 // Allow multiple definitions for ObjC built-in typedefs. 728 // FIXME: Verify the underlying types are equivalent! 729 if (getLangOptions().ObjC1) { 730 const IdentifierInfo *TypeID = New->getIdentifier(); 731 switch (TypeID->getLength()) { 732 default: break; 733 case 2: 734 if (!TypeID->isStr("id")) 735 break; 736 Context.ObjCIdRedefinitionType = New->getUnderlyingType(); 737 // Install the built-in type for 'id', ignoring the current definition. 738 New->setTypeForDecl(Context.getObjCIdType().getTypePtr()); 739 return; 740 case 5: 741 if (!TypeID->isStr("Class")) 742 break; 743 Context.ObjCClassRedefinitionType = New->getUnderlyingType(); 744 // Install the built-in type for 'Class', ignoring the current definition. 745 New->setTypeForDecl(Context.getObjCClassType().getTypePtr()); 746 return; 747 case 3: 748 if (!TypeID->isStr("SEL")) 749 break; 750 Context.ObjCSelRedefinitionType = New->getUnderlyingType(); 751 // Install the built-in type for 'SEL', ignoring the current definition. 752 New->setTypeForDecl(Context.getObjCSelType().getTypePtr()); 753 return; 754 case 8: 755 if (!TypeID->isStr("Protocol")) 756 break; 757 Context.setObjCProtoType(New->getUnderlyingType()); 758 return; 759 } 760 // Fall through - the typedef name was not a builtin type. 761 } 762 763 // Verify the old decl was also a type. 764 TypeDecl *Old = OldDecls.getAsSingle<TypeDecl>(); 765 if (!Old) { 766 Diag(New->getLocation(), diag::err_redefinition_different_kind) 767 << New->getDeclName(); 768 769 NamedDecl *OldD = OldDecls.getRepresentativeDecl(); 770 if (OldD->getLocation().isValid()) 771 Diag(OldD->getLocation(), diag::note_previous_definition); 772 773 return New->setInvalidDecl(); 774 } 775 776 // If the old declaration is invalid, just give up here. 777 if (Old->isInvalidDecl()) 778 return New->setInvalidDecl(); 779 780 // Determine the "old" type we'll use for checking and diagnostics. 781 QualType OldType; 782 if (TypedefDecl *OldTypedef = dyn_cast<TypedefDecl>(Old)) 783 OldType = OldTypedef->getUnderlyingType(); 784 else 785 OldType = Context.getTypeDeclType(Old); 786 787 // If the typedef types are not identical, reject them in all languages and 788 // with any extensions enabled. 789 790 if (OldType != New->getUnderlyingType() && 791 Context.getCanonicalType(OldType) != 792 Context.getCanonicalType(New->getUnderlyingType())) { 793 Diag(New->getLocation(), diag::err_redefinition_different_typedef) 794 << New->getUnderlyingType() << OldType; 795 if (Old->getLocation().isValid()) 796 Diag(Old->getLocation(), diag::note_previous_definition); 797 return New->setInvalidDecl(); 798 } 799 800 // The types match. Link up the redeclaration chain if the old 801 // declaration was a typedef. 802 // FIXME: this is a potential source of wierdness if the type 803 // spellings don't match exactly. 804 if (isa<TypedefDecl>(Old)) 805 New->setPreviousDeclaration(cast<TypedefDecl>(Old)); 806 807 if (getLangOptions().Microsoft) 808 return; 809 810 if (getLangOptions().CPlusPlus) { 811 // C++ [dcl.typedef]p2: 812 // In a given non-class scope, a typedef specifier can be used to 813 // redefine the name of any type declared in that scope to refer 814 // to the type to which it already refers. 815 if (!isa<CXXRecordDecl>(CurContext)) 816 return; 817 818 // C++0x [dcl.typedef]p4: 819 // In a given class scope, a typedef specifier can be used to redefine 820 // any class-name declared in that scope that is not also a typedef-name 821 // to refer to the type to which it already refers. 822 // 823 // This wording came in via DR424, which was a correction to the 824 // wording in DR56, which accidentally banned code like: 825 // 826 // struct S { 827 // typedef struct A { } A; 828 // }; 829 // 830 // in the C++03 standard. We implement the C++0x semantics, which 831 // allow the above but disallow 832 // 833 // struct S { 834 // typedef int I; 835 // typedef int I; 836 // }; 837 // 838 // since that was the intent of DR56. 839 if (!isa<TypedefDecl >(Old)) 840 return; 841 842 Diag(New->getLocation(), diag::err_redefinition) 843 << New->getDeclName(); 844 Diag(Old->getLocation(), diag::note_previous_definition); 845 return New->setInvalidDecl(); 846 } 847 848 // If we have a redefinition of a typedef in C, emit a warning. This warning 849 // is normally mapped to an error, but can be controlled with 850 // -Wtypedef-redefinition. If either the original or the redefinition is 851 // in a system header, don't emit this for compatibility with GCC. 852 if (PP.getDiagnostics().getSuppressSystemWarnings() && 853 (Context.getSourceManager().isInSystemHeader(Old->getLocation()) || 854 Context.getSourceManager().isInSystemHeader(New->getLocation()))) 855 return; 856 857 Diag(New->getLocation(), diag::warn_redefinition_of_typedef) 858 << New->getDeclName(); 859 Diag(Old->getLocation(), diag::note_previous_definition); 860 return; 861} 862 863/// DeclhasAttr - returns true if decl Declaration already has the target 864/// attribute. 865static bool 866DeclHasAttr(const Decl *decl, const Attr *target) { 867 for (const Attr *attr = decl->getAttrs(); attr; attr = attr->getNext()) 868 if (attr->getKind() == target->getKind()) 869 return true; 870 871 return false; 872} 873 874/// MergeAttributes - append attributes from the Old decl to the New one. 875static void MergeAttributes(Decl *New, Decl *Old, ASTContext &C) { 876 for (const Attr *attr = Old->getAttrs(); attr; attr = attr->getNext()) { 877 if (!DeclHasAttr(New, attr) && attr->isMerged()) { 878 Attr *NewAttr = attr->clone(C); 879 NewAttr->setInherited(true); 880 New->addAttr(NewAttr); 881 } 882 } 883} 884 885/// Used in MergeFunctionDecl to keep track of function parameters in 886/// C. 887struct GNUCompatibleParamWarning { 888 ParmVarDecl *OldParm; 889 ParmVarDecl *NewParm; 890 QualType PromotedType; 891}; 892 893 894/// getSpecialMember - get the special member enum for a method. 895static Sema::CXXSpecialMember getSpecialMember(ASTContext &Ctx, 896 const CXXMethodDecl *MD) { 897 if (const CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(MD)) { 898 if (Ctor->isDefaultConstructor()) 899 return Sema::CXXDefaultConstructor; 900 if (Ctor->isCopyConstructor()) 901 return Sema::CXXCopyConstructor; 902 } 903 904 if (isa<CXXDestructorDecl>(MD)) 905 return Sema::CXXDestructor; 906 907 assert(MD->isCopyAssignment() && "Must have copy assignment operator"); 908 return Sema::CXXCopyAssignment; 909} 910 911/// canREdefineFunction - checks if a function can be redefined. Currently, 912/// only extern inline functions can be redefined, and even then only in 913/// GNU89 mode. 914static bool canRedefineFunction(const FunctionDecl *FD, 915 const LangOptions& LangOpts) { 916 return (LangOpts.GNUMode && !LangOpts.C99 && !LangOpts.CPlusPlus && 917 FD->isInlineSpecified() && 918 FD->getStorageClass() == FunctionDecl::Extern); 919} 920 921/// MergeFunctionDecl - We just parsed a function 'New' from 922/// declarator D which has the same name and scope as a previous 923/// declaration 'Old'. Figure out how to resolve this situation, 924/// merging decls or emitting diagnostics as appropriate. 925/// 926/// In C++, New and Old must be declarations that are not 927/// overloaded. Use IsOverload to determine whether New and Old are 928/// overloaded, and to select the Old declaration that New should be 929/// merged with. 930/// 931/// Returns true if there was an error, false otherwise. 932bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD) { 933 // Verify the old decl was also a function. 934 FunctionDecl *Old = 0; 935 if (FunctionTemplateDecl *OldFunctionTemplate 936 = dyn_cast<FunctionTemplateDecl>(OldD)) 937 Old = OldFunctionTemplate->getTemplatedDecl(); 938 else 939 Old = dyn_cast<FunctionDecl>(OldD); 940 if (!Old) { 941 if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(OldD)) { 942 Diag(New->getLocation(), diag::err_using_decl_conflict_reverse); 943 Diag(Shadow->getTargetDecl()->getLocation(), 944 diag::note_using_decl_target); 945 Diag(Shadow->getUsingDecl()->getLocation(), 946 diag::note_using_decl) << 0; 947 return true; 948 } 949 950 Diag(New->getLocation(), diag::err_redefinition_different_kind) 951 << New->getDeclName(); 952 Diag(OldD->getLocation(), diag::note_previous_definition); 953 return true; 954 } 955 956 // Determine whether the previous declaration was a definition, 957 // implicit declaration, or a declaration. 958 diag::kind PrevDiag; 959 if (Old->isThisDeclarationADefinition()) 960 PrevDiag = diag::note_previous_definition; 961 else if (Old->isImplicit()) 962 PrevDiag = diag::note_previous_implicit_declaration; 963 else 964 PrevDiag = diag::note_previous_declaration; 965 966 QualType OldQType = Context.getCanonicalType(Old->getType()); 967 QualType NewQType = Context.getCanonicalType(New->getType()); 968 969 // Don't complain about this if we're in GNU89 mode and the old function 970 // is an extern inline function. 971 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) && 972 New->getStorageClass() == FunctionDecl::Static && 973 Old->getStorageClass() != FunctionDecl::Static && 974 !canRedefineFunction(Old, getLangOptions())) { 975 Diag(New->getLocation(), diag::err_static_non_static) 976 << New; 977 Diag(Old->getLocation(), PrevDiag); 978 return true; 979 } 980 981 // If a function is first declared with a calling convention, but is 982 // later declared or defined without one, the second decl assumes the 983 // calling convention of the first. 984 // 985 // For the new decl, we have to look at the NON-canonical type to tell the 986 // difference between a function that really doesn't have a calling 987 // convention and one that is declared cdecl. That's because in 988 // canonicalization (see ASTContext.cpp), cdecl is canonicalized away 989 // because it is the default calling convention. 990 // 991 // Note also that we DO NOT return at this point, because we still have 992 // other tests to run. 993 const FunctionType *OldType = OldQType->getAs<FunctionType>(); 994 const FunctionType *NewType = New->getType()->getAs<FunctionType>(); 995 if (OldType->getCallConv() != CC_Default && 996 NewType->getCallConv() == CC_Default) { 997 NewQType = Context.getCallConvType(NewQType, OldType->getCallConv()); 998 New->setType(NewQType); 999 NewQType = Context.getCanonicalType(NewQType); 1000 } else if (!Context.isSameCallConv(OldType->getCallConv(), 1001 NewType->getCallConv())) { 1002 // Calling conventions really aren't compatible, so complain. 1003 Diag(New->getLocation(), diag::err_cconv_change) 1004 << FunctionType::getNameForCallConv(NewType->getCallConv()) 1005 << (OldType->getCallConv() == CC_Default) 1006 << (OldType->getCallConv() == CC_Default ? "" : 1007 FunctionType::getNameForCallConv(OldType->getCallConv())); 1008 Diag(Old->getLocation(), diag::note_previous_declaration); 1009 return true; 1010 } 1011 1012 // FIXME: diagnose the other way around? 1013 if (OldType->getNoReturnAttr() && !NewType->getNoReturnAttr()) { 1014 NewQType = Context.getNoReturnType(NewQType); 1015 New->setType(NewQType); 1016 assert(NewQType.isCanonical()); 1017 } 1018 1019 if (getLangOptions().CPlusPlus) { 1020 // (C++98 13.1p2): 1021 // Certain function declarations cannot be overloaded: 1022 // -- Function declarations that differ only in the return type 1023 // cannot be overloaded. 1024 QualType OldReturnType 1025 = cast<FunctionType>(OldQType.getTypePtr())->getResultType(); 1026 QualType NewReturnType 1027 = cast<FunctionType>(NewQType.getTypePtr())->getResultType(); 1028 if (OldReturnType != NewReturnType) { 1029 Diag(New->getLocation(), diag::err_ovl_diff_return_type); 1030 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1031 return true; 1032 } 1033 1034 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 1035 const CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 1036 if (OldMethod && NewMethod) { 1037 if (!NewMethod->getFriendObjectKind() && 1038 NewMethod->getLexicalDeclContext()->isRecord()) { 1039 // -- Member function declarations with the same name and the 1040 // same parameter types cannot be overloaded if any of them 1041 // is a static member function declaration. 1042 if (OldMethod->isStatic() || NewMethod->isStatic()) { 1043 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 1044 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1045 return true; 1046 } 1047 1048 // C++ [class.mem]p1: 1049 // [...] A member shall not be declared twice in the 1050 // member-specification, except that a nested class or member 1051 // class template can be declared and then later defined. 1052 unsigned NewDiag; 1053 if (isa<CXXConstructorDecl>(OldMethod)) 1054 NewDiag = diag::err_constructor_redeclared; 1055 else if (isa<CXXDestructorDecl>(NewMethod)) 1056 NewDiag = diag::err_destructor_redeclared; 1057 else if (isa<CXXConversionDecl>(NewMethod)) 1058 NewDiag = diag::err_conv_function_redeclared; 1059 else 1060 NewDiag = diag::err_member_redeclared; 1061 1062 Diag(New->getLocation(), NewDiag); 1063 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1064 } else { 1065 if (OldMethod->isImplicit()) { 1066 Diag(NewMethod->getLocation(), 1067 diag::err_definition_of_implicitly_declared_member) 1068 << New << getSpecialMember(Context, OldMethod); 1069 1070 Diag(OldMethod->getLocation(), 1071 diag::note_previous_implicit_declaration); 1072 return true; 1073 } 1074 } 1075 } 1076 1077 // (C++98 8.3.5p3): 1078 // All declarations for a function shall agree exactly in both the 1079 // return type and the parameter-type-list. 1080 // attributes should be ignored when comparing. 1081 if (Context.getNoReturnType(OldQType, false) == 1082 Context.getNoReturnType(NewQType, false)) 1083 return MergeCompatibleFunctionDecls(New, Old); 1084 1085 // Fall through for conflicting redeclarations and redefinitions. 1086 } 1087 1088 // C: Function types need to be compatible, not identical. This handles 1089 // duplicate function decls like "void f(int); void f(enum X);" properly. 1090 if (!getLangOptions().CPlusPlus && 1091 Context.typesAreCompatible(OldQType, NewQType)) { 1092 const FunctionType *OldFuncType = OldQType->getAs<FunctionType>(); 1093 const FunctionType *NewFuncType = NewQType->getAs<FunctionType>(); 1094 const FunctionProtoType *OldProto = 0; 1095 if (isa<FunctionNoProtoType>(NewFuncType) && 1096 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) { 1097 // The old declaration provided a function prototype, but the 1098 // new declaration does not. Merge in the prototype. 1099 assert(!OldProto->hasExceptionSpec() && "Exception spec in C"); 1100 llvm::SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(), 1101 OldProto->arg_type_end()); 1102 NewQType = Context.getFunctionType(NewFuncType->getResultType(), 1103 ParamTypes.data(), ParamTypes.size(), 1104 OldProto->isVariadic(), 1105 OldProto->getTypeQuals()); 1106 New->setType(NewQType); 1107 New->setHasInheritedPrototype(); 1108 1109 // Synthesize a parameter for each argument type. 1110 llvm::SmallVector<ParmVarDecl*, 16> Params; 1111 for (FunctionProtoType::arg_type_iterator 1112 ParamType = OldProto->arg_type_begin(), 1113 ParamEnd = OldProto->arg_type_end(); 1114 ParamType != ParamEnd; ++ParamType) { 1115 ParmVarDecl *Param = ParmVarDecl::Create(Context, New, 1116 SourceLocation(), 0, 1117 *ParamType, /*TInfo=*/0, 1118 VarDecl::None, 0); 1119 Param->setImplicit(); 1120 Params.push_back(Param); 1121 } 1122 1123 New->setParams(Params.data(), Params.size()); 1124 } 1125 1126 return MergeCompatibleFunctionDecls(New, Old); 1127 } 1128 1129 // GNU C permits a K&R definition to follow a prototype declaration 1130 // if the declared types of the parameters in the K&R definition 1131 // match the types in the prototype declaration, even when the 1132 // promoted types of the parameters from the K&R definition differ 1133 // from the types in the prototype. GCC then keeps the types from 1134 // the prototype. 1135 // 1136 // If a variadic prototype is followed by a non-variadic K&R definition, 1137 // the K&R definition becomes variadic. This is sort of an edge case, but 1138 // it's legal per the standard depending on how you read C99 6.7.5.3p15 and 1139 // C99 6.9.1p8. 1140 if (!getLangOptions().CPlusPlus && 1141 Old->hasPrototype() && !New->hasPrototype() && 1142 New->getType()->getAs<FunctionProtoType>() && 1143 Old->getNumParams() == New->getNumParams()) { 1144 llvm::SmallVector<QualType, 16> ArgTypes; 1145 llvm::SmallVector<GNUCompatibleParamWarning, 16> Warnings; 1146 const FunctionProtoType *OldProto 1147 = Old->getType()->getAs<FunctionProtoType>(); 1148 const FunctionProtoType *NewProto 1149 = New->getType()->getAs<FunctionProtoType>(); 1150 1151 // Determine whether this is the GNU C extension. 1152 QualType MergedReturn = Context.mergeTypes(OldProto->getResultType(), 1153 NewProto->getResultType()); 1154 bool LooseCompatible = !MergedReturn.isNull(); 1155 for (unsigned Idx = 0, End = Old->getNumParams(); 1156 LooseCompatible && Idx != End; ++Idx) { 1157 ParmVarDecl *OldParm = Old->getParamDecl(Idx); 1158 ParmVarDecl *NewParm = New->getParamDecl(Idx); 1159 if (Context.typesAreCompatible(OldParm->getType(), 1160 NewProto->getArgType(Idx))) { 1161 ArgTypes.push_back(NewParm->getType()); 1162 } else if (Context.typesAreCompatible(OldParm->getType(), 1163 NewParm->getType())) { 1164 GNUCompatibleParamWarning Warn 1165 = { OldParm, NewParm, NewProto->getArgType(Idx) }; 1166 Warnings.push_back(Warn); 1167 ArgTypes.push_back(NewParm->getType()); 1168 } else 1169 LooseCompatible = false; 1170 } 1171 1172 if (LooseCompatible) { 1173 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) { 1174 Diag(Warnings[Warn].NewParm->getLocation(), 1175 diag::ext_param_promoted_not_compatible_with_prototype) 1176 << Warnings[Warn].PromotedType 1177 << Warnings[Warn].OldParm->getType(); 1178 Diag(Warnings[Warn].OldParm->getLocation(), 1179 diag::note_previous_declaration); 1180 } 1181 1182 New->setType(Context.getFunctionType(MergedReturn, &ArgTypes[0], 1183 ArgTypes.size(), 1184 OldProto->isVariadic(), 0)); 1185 return MergeCompatibleFunctionDecls(New, Old); 1186 } 1187 1188 // Fall through to diagnose conflicting types. 1189 } 1190 1191 // A function that has already been declared has been redeclared or defined 1192 // with a different type- show appropriate diagnostic 1193 if (unsigned BuiltinID = Old->getBuiltinID()) { 1194 // The user has declared a builtin function with an incompatible 1195 // signature. 1196 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 1197 // The function the user is redeclaring is a library-defined 1198 // function like 'malloc' or 'printf'. Warn about the 1199 // redeclaration, then pretend that we don't know about this 1200 // library built-in. 1201 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; 1202 Diag(Old->getLocation(), diag::note_previous_builtin_declaration) 1203 << Old << Old->getType(); 1204 New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin); 1205 Old->setInvalidDecl(); 1206 return false; 1207 } 1208 1209 PrevDiag = diag::note_previous_builtin_declaration; 1210 } 1211 1212 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 1213 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1214 return true; 1215} 1216 1217/// \brief Completes the merge of two function declarations that are 1218/// known to be compatible. 1219/// 1220/// This routine handles the merging of attributes and other 1221/// properties of function declarations form the old declaration to 1222/// the new declaration, once we know that New is in fact a 1223/// redeclaration of Old. 1224/// 1225/// \returns false 1226bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old) { 1227 // Merge the attributes 1228 MergeAttributes(New, Old, Context); 1229 1230 // Merge the storage class. 1231 if (Old->getStorageClass() != FunctionDecl::Extern && 1232 Old->getStorageClass() != FunctionDecl::None) 1233 New->setStorageClass(Old->getStorageClass()); 1234 1235 // Merge "pure" flag. 1236 if (Old->isPure()) 1237 New->setPure(); 1238 1239 // Merge the "deleted" flag. 1240 if (Old->isDeleted()) 1241 New->setDeleted(); 1242 1243 if (getLangOptions().CPlusPlus) 1244 return MergeCXXFunctionDecl(New, Old); 1245 1246 return false; 1247} 1248 1249/// MergeVarDecl - We just parsed a variable 'New' which has the same name 1250/// and scope as a previous declaration 'Old'. Figure out how to resolve this 1251/// situation, merging decls or emitting diagnostics as appropriate. 1252/// 1253/// Tentative definition rules (C99 6.9.2p2) are checked by 1254/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 1255/// definitions here, since the initializer hasn't been attached. 1256/// 1257void Sema::MergeVarDecl(VarDecl *New, LookupResult &Previous) { 1258 // If the new decl is already invalid, don't do any other checking. 1259 if (New->isInvalidDecl()) 1260 return; 1261 1262 // Verify the old decl was also a variable. 1263 VarDecl *Old = 0; 1264 if (!Previous.isSingleResult() || 1265 !(Old = dyn_cast<VarDecl>(Previous.getFoundDecl()))) { 1266 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1267 << New->getDeclName(); 1268 Diag(Previous.getRepresentativeDecl()->getLocation(), 1269 diag::note_previous_definition); 1270 return New->setInvalidDecl(); 1271 } 1272 1273 MergeAttributes(New, Old, Context); 1274 1275 // Merge the types 1276 QualType MergedT; 1277 if (getLangOptions().CPlusPlus) { 1278 if (Context.hasSameType(New->getType(), Old->getType())) 1279 MergedT = New->getType(); 1280 // C++ [basic.link]p10: 1281 // [...] the types specified by all declarations referring to a given 1282 // object or function shall be identical, except that declarations for an 1283 // array object can specify array types that differ by the presence or 1284 // absence of a major array bound (8.3.4). 1285 else if (Old->getType()->isIncompleteArrayType() && 1286 New->getType()->isArrayType()) { 1287 CanQual<ArrayType> OldArray 1288 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 1289 CanQual<ArrayType> NewArray 1290 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 1291 if (OldArray->getElementType() == NewArray->getElementType()) 1292 MergedT = New->getType(); 1293 } else if (Old->getType()->isArrayType() && 1294 New->getType()->isIncompleteArrayType()) { 1295 CanQual<ArrayType> OldArray 1296 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 1297 CanQual<ArrayType> NewArray 1298 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 1299 if (OldArray->getElementType() == NewArray->getElementType()) 1300 MergedT = Old->getType(); 1301 } 1302 } else { 1303 MergedT = Context.mergeTypes(New->getType(), Old->getType()); 1304 } 1305 if (MergedT.isNull()) { 1306 Diag(New->getLocation(), diag::err_redefinition_different_type) 1307 << New->getDeclName(); 1308 Diag(Old->getLocation(), diag::note_previous_definition); 1309 return New->setInvalidDecl(); 1310 } 1311 New->setType(MergedT); 1312 1313 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 1314 if (New->getStorageClass() == VarDecl::Static && 1315 (Old->getStorageClass() == VarDecl::None || Old->hasExternalStorage())) { 1316 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 1317 Diag(Old->getLocation(), diag::note_previous_definition); 1318 return New->setInvalidDecl(); 1319 } 1320 // C99 6.2.2p4: 1321 // For an identifier declared with the storage-class specifier 1322 // extern in a scope in which a prior declaration of that 1323 // identifier is visible,23) if the prior declaration specifies 1324 // internal or external linkage, the linkage of the identifier at 1325 // the later declaration is the same as the linkage specified at 1326 // the prior declaration. If no prior declaration is visible, or 1327 // if the prior declaration specifies no linkage, then the 1328 // identifier has external linkage. 1329 if (New->hasExternalStorage() && Old->hasLinkage()) 1330 /* Okay */; 1331 else if (New->getStorageClass() != VarDecl::Static && 1332 Old->getStorageClass() == VarDecl::Static) { 1333 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 1334 Diag(Old->getLocation(), diag::note_previous_definition); 1335 return New->setInvalidDecl(); 1336 } 1337 1338 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 1339 1340 // FIXME: The test for external storage here seems wrong? We still 1341 // need to check for mismatches. 1342 if (!New->hasExternalStorage() && !New->isFileVarDecl() && 1343 // Don't complain about out-of-line definitions of static members. 1344 !(Old->getLexicalDeclContext()->isRecord() && 1345 !New->getLexicalDeclContext()->isRecord())) { 1346 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 1347 Diag(Old->getLocation(), diag::note_previous_definition); 1348 return New->setInvalidDecl(); 1349 } 1350 1351 if (New->isThreadSpecified() && !Old->isThreadSpecified()) { 1352 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName(); 1353 Diag(Old->getLocation(), diag::note_previous_definition); 1354 } else if (!New->isThreadSpecified() && Old->isThreadSpecified()) { 1355 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName(); 1356 Diag(Old->getLocation(), diag::note_previous_definition); 1357 } 1358 1359 // C++ doesn't have tentative definitions, so go right ahead and check here. 1360 const VarDecl *Def; 1361 if (getLangOptions().CPlusPlus && 1362 New->isThisDeclarationADefinition() == VarDecl::Definition && 1363 (Def = Old->getDefinition())) { 1364 Diag(New->getLocation(), diag::err_redefinition) 1365 << New->getDeclName(); 1366 Diag(Def->getLocation(), diag::note_previous_definition); 1367 New->setInvalidDecl(); 1368 return; 1369 } 1370 1371 // Keep a chain of previous declarations. 1372 New->setPreviousDeclaration(Old); 1373 1374 // Inherit access appropriately. 1375 New->setAccess(Old->getAccess()); 1376} 1377 1378/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 1379/// no declarator (e.g. "struct foo;") is parsed. 1380Sema::DeclPtrTy Sema::ParsedFreeStandingDeclSpec(Scope *S, DeclSpec &DS) { 1381 // FIXME: Error on auto/register at file scope 1382 // FIXME: Error on inline/virtual/explicit 1383 // FIXME: Warn on useless __thread 1384 // FIXME: Warn on useless const/volatile 1385 // FIXME: Warn on useless static/extern/typedef/private_extern/mutable 1386 // FIXME: Warn on useless attributes 1387 Decl *TagD = 0; 1388 TagDecl *Tag = 0; 1389 if (DS.getTypeSpecType() == DeclSpec::TST_class || 1390 DS.getTypeSpecType() == DeclSpec::TST_struct || 1391 DS.getTypeSpecType() == DeclSpec::TST_union || 1392 DS.getTypeSpecType() == DeclSpec::TST_enum) { 1393 TagD = static_cast<Decl *>(DS.getTypeRep()); 1394 1395 if (!TagD) // We probably had an error 1396 return DeclPtrTy(); 1397 1398 // Note that the above type specs guarantee that the 1399 // type rep is a Decl, whereas in many of the others 1400 // it's a Type. 1401 Tag = dyn_cast<TagDecl>(TagD); 1402 } 1403 1404 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 1405 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 1406 // or incomplete types shall not be restrict-qualified." 1407 if (TypeQuals & DeclSpec::TQ_restrict) 1408 Diag(DS.getRestrictSpecLoc(), 1409 diag::err_typecheck_invalid_restrict_not_pointer_noarg) 1410 << DS.getSourceRange(); 1411 } 1412 1413 if (DS.isFriendSpecified()) { 1414 // If we're dealing with a class template decl, assume that the 1415 // template routines are handling it. 1416 if (TagD && isa<ClassTemplateDecl>(TagD)) 1417 return DeclPtrTy(); 1418 return ActOnFriendTypeDecl(S, DS, MultiTemplateParamsArg(*this, 0, 0)); 1419 } 1420 1421 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 1422 // If there are attributes in the DeclSpec, apply them to the record. 1423 if (const AttributeList *AL = DS.getAttributes()) 1424 ProcessDeclAttributeList(S, Record, AL); 1425 1426 if (!Record->getDeclName() && Record->isDefinition() && 1427 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { 1428 if (getLangOptions().CPlusPlus || 1429 Record->getDeclContext()->isRecord()) 1430 return BuildAnonymousStructOrUnion(S, DS, Record); 1431 1432 Diag(DS.getSourceRange().getBegin(), diag::err_no_declarators) 1433 << DS.getSourceRange(); 1434 } 1435 1436 // Microsoft allows unnamed struct/union fields. Don't complain 1437 // about them. 1438 // FIXME: Should we support Microsoft's extensions in this area? 1439 if (Record->getDeclName() && getLangOptions().Microsoft) 1440 return DeclPtrTy::make(Tag); 1441 } 1442 1443 if (!DS.isMissingDeclaratorOk() && 1444 DS.getTypeSpecType() != DeclSpec::TST_error) { 1445 // Warn about typedefs of enums without names, since this is an 1446 // extension in both Microsoft an GNU. 1447 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 1448 Tag && isa<EnumDecl>(Tag)) { 1449 Diag(DS.getSourceRange().getBegin(), diag::ext_typedef_without_a_name) 1450 << DS.getSourceRange(); 1451 return DeclPtrTy::make(Tag); 1452 } 1453 1454 Diag(DS.getSourceRange().getBegin(), diag::err_no_declarators) 1455 << DS.getSourceRange(); 1456 return DeclPtrTy(); 1457 } 1458 1459 return DeclPtrTy::make(Tag); 1460} 1461 1462/// We are trying to inject an anonymous member into the given scope; 1463/// check if there's an existing declaration that can't be overloaded. 1464/// 1465/// \return true if this is a forbidden redeclaration 1466static bool CheckAnonMemberRedeclaration(Sema &SemaRef, 1467 Scope *S, 1468 DeclContext *Owner, 1469 DeclarationName Name, 1470 SourceLocation NameLoc, 1471 unsigned diagnostic) { 1472 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupMemberName, 1473 Sema::ForRedeclaration); 1474 if (!SemaRef.LookupName(R, S)) return false; 1475 1476 if (R.getAsSingle<TagDecl>()) 1477 return false; 1478 1479 // Pick a representative declaration. 1480 NamedDecl *PrevDecl = R.getRepresentativeDecl()->getUnderlyingDecl(); 1481 if (PrevDecl && Owner->isRecord()) { 1482 RecordDecl *Record = cast<RecordDecl>(Owner); 1483 if (!SemaRef.isDeclInScope(PrevDecl, Record, S)) 1484 return false; 1485 } 1486 1487 SemaRef.Diag(NameLoc, diagnostic) << Name; 1488 SemaRef.Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 1489 1490 return true; 1491} 1492 1493/// InjectAnonymousStructOrUnionMembers - Inject the members of the 1494/// anonymous struct or union AnonRecord into the owning context Owner 1495/// and scope S. This routine will be invoked just after we realize 1496/// that an unnamed union or struct is actually an anonymous union or 1497/// struct, e.g., 1498/// 1499/// @code 1500/// union { 1501/// int i; 1502/// float f; 1503/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 1504/// // f into the surrounding scope.x 1505/// @endcode 1506/// 1507/// This routine is recursive, injecting the names of nested anonymous 1508/// structs/unions into the owning context and scope as well. 1509bool Sema::InjectAnonymousStructOrUnionMembers(Scope *S, DeclContext *Owner, 1510 RecordDecl *AnonRecord) { 1511 unsigned diagKind 1512 = AnonRecord->isUnion() ? diag::err_anonymous_union_member_redecl 1513 : diag::err_anonymous_struct_member_redecl; 1514 1515 bool Invalid = false; 1516 for (RecordDecl::field_iterator F = AnonRecord->field_begin(), 1517 FEnd = AnonRecord->field_end(); 1518 F != FEnd; ++F) { 1519 if ((*F)->getDeclName()) { 1520 if (CheckAnonMemberRedeclaration(*this, S, Owner, (*F)->getDeclName(), 1521 (*F)->getLocation(), diagKind)) { 1522 // C++ [class.union]p2: 1523 // The names of the members of an anonymous union shall be 1524 // distinct from the names of any other entity in the 1525 // scope in which the anonymous union is declared. 1526 Invalid = true; 1527 } else { 1528 // C++ [class.union]p2: 1529 // For the purpose of name lookup, after the anonymous union 1530 // definition, the members of the anonymous union are 1531 // considered to have been defined in the scope in which the 1532 // anonymous union is declared. 1533 Owner->makeDeclVisibleInContext(*F); 1534 S->AddDecl(DeclPtrTy::make(*F)); 1535 IdResolver.AddDecl(*F); 1536 } 1537 } else if (const RecordType *InnerRecordType 1538 = (*F)->getType()->getAs<RecordType>()) { 1539 RecordDecl *InnerRecord = InnerRecordType->getDecl(); 1540 if (InnerRecord->isAnonymousStructOrUnion()) 1541 Invalid = Invalid || 1542 InjectAnonymousStructOrUnionMembers(S, Owner, InnerRecord); 1543 } 1544 } 1545 1546 return Invalid; 1547} 1548 1549/// ActOnAnonymousStructOrUnion - Handle the declaration of an 1550/// anonymous structure or union. Anonymous unions are a C++ feature 1551/// (C++ [class.union]) and a GNU C extension; anonymous structures 1552/// are a GNU C and GNU C++ extension. 1553Sema::DeclPtrTy Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 1554 RecordDecl *Record) { 1555 DeclContext *Owner = Record->getDeclContext(); 1556 1557 // Diagnose whether this anonymous struct/union is an extension. 1558 if (Record->isUnion() && !getLangOptions().CPlusPlus) 1559 Diag(Record->getLocation(), diag::ext_anonymous_union); 1560 else if (!Record->isUnion()) 1561 Diag(Record->getLocation(), diag::ext_anonymous_struct); 1562 1563 // C and C++ require different kinds of checks for anonymous 1564 // structs/unions. 1565 bool Invalid = false; 1566 if (getLangOptions().CPlusPlus) { 1567 const char* PrevSpec = 0; 1568 unsigned DiagID; 1569 // C++ [class.union]p3: 1570 // Anonymous unions declared in a named namespace or in the 1571 // global namespace shall be declared static. 1572 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 1573 (isa<TranslationUnitDecl>(Owner) || 1574 (isa<NamespaceDecl>(Owner) && 1575 cast<NamespaceDecl>(Owner)->getDeclName()))) { 1576 Diag(Record->getLocation(), diag::err_anonymous_union_not_static); 1577 Invalid = true; 1578 1579 // Recover by adding 'static'. 1580 DS.SetStorageClassSpec(DeclSpec::SCS_static, SourceLocation(), 1581 PrevSpec, DiagID); 1582 } 1583 // C++ [class.union]p3: 1584 // A storage class is not allowed in a declaration of an 1585 // anonymous union in a class scope. 1586 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 1587 isa<RecordDecl>(Owner)) { 1588 Diag(DS.getStorageClassSpecLoc(), 1589 diag::err_anonymous_union_with_storage_spec); 1590 Invalid = true; 1591 1592 // Recover by removing the storage specifier. 1593 DS.SetStorageClassSpec(DeclSpec::SCS_unspecified, SourceLocation(), 1594 PrevSpec, DiagID); 1595 } 1596 1597 // C++ [class.union]p2: 1598 // The member-specification of an anonymous union shall only 1599 // define non-static data members. [Note: nested types and 1600 // functions cannot be declared within an anonymous union. ] 1601 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 1602 MemEnd = Record->decls_end(); 1603 Mem != MemEnd; ++Mem) { 1604 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 1605 // C++ [class.union]p3: 1606 // An anonymous union shall not have private or protected 1607 // members (clause 11). 1608 if (FD->getAccess() == AS_protected || FD->getAccess() == AS_private) { 1609 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 1610 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 1611 Invalid = true; 1612 } 1613 } else if ((*Mem)->isImplicit()) { 1614 // Any implicit members are fine. 1615 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 1616 // This is a type that showed up in an 1617 // elaborated-type-specifier inside the anonymous struct or 1618 // union, but which actually declares a type outside of the 1619 // anonymous struct or union. It's okay. 1620 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 1621 if (!MemRecord->isAnonymousStructOrUnion() && 1622 MemRecord->getDeclName()) { 1623 // This is a nested type declaration. 1624 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 1625 << (int)Record->isUnion(); 1626 Invalid = true; 1627 } 1628 } else { 1629 // We have something that isn't a non-static data 1630 // member. Complain about it. 1631 unsigned DK = diag::err_anonymous_record_bad_member; 1632 if (isa<TypeDecl>(*Mem)) 1633 DK = diag::err_anonymous_record_with_type; 1634 else if (isa<FunctionDecl>(*Mem)) 1635 DK = diag::err_anonymous_record_with_function; 1636 else if (isa<VarDecl>(*Mem)) 1637 DK = diag::err_anonymous_record_with_static; 1638 Diag((*Mem)->getLocation(), DK) 1639 << (int)Record->isUnion(); 1640 Invalid = true; 1641 } 1642 } 1643 } 1644 1645 if (!Record->isUnion() && !Owner->isRecord()) { 1646 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 1647 << (int)getLangOptions().CPlusPlus; 1648 Invalid = true; 1649 } 1650 1651 // Mock up a declarator. 1652 Declarator Dc(DS, Declarator::TypeNameContext); 1653 TypeSourceInfo *TInfo = 0; 1654 GetTypeForDeclarator(Dc, S, &TInfo); 1655 assert(TInfo && "couldn't build declarator info for anonymous struct/union"); 1656 1657 // Create a declaration for this anonymous struct/union. 1658 NamedDecl *Anon = 0; 1659 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 1660 Anon = FieldDecl::Create(Context, OwningClass, Record->getLocation(), 1661 /*IdentifierInfo=*/0, 1662 Context.getTypeDeclType(Record), 1663 TInfo, 1664 /*BitWidth=*/0, /*Mutable=*/false); 1665 Anon->setAccess(AS_public); 1666 if (getLangOptions().CPlusPlus) 1667 FieldCollector->Add(cast<FieldDecl>(Anon)); 1668 } else { 1669 VarDecl::StorageClass SC; 1670 switch (DS.getStorageClassSpec()) { 1671 default: assert(0 && "Unknown storage class!"); 1672 case DeclSpec::SCS_unspecified: SC = VarDecl::None; break; 1673 case DeclSpec::SCS_extern: SC = VarDecl::Extern; break; 1674 case DeclSpec::SCS_static: SC = VarDecl::Static; break; 1675 case DeclSpec::SCS_auto: SC = VarDecl::Auto; break; 1676 case DeclSpec::SCS_register: SC = VarDecl::Register; break; 1677 case DeclSpec::SCS_private_extern: SC = VarDecl::PrivateExtern; break; 1678 case DeclSpec::SCS_mutable: 1679 // mutable can only appear on non-static class members, so it's always 1680 // an error here 1681 Diag(Record->getLocation(), diag::err_mutable_nonmember); 1682 Invalid = true; 1683 SC = VarDecl::None; 1684 break; 1685 } 1686 1687 Anon = VarDecl::Create(Context, Owner, Record->getLocation(), 1688 /*IdentifierInfo=*/0, 1689 Context.getTypeDeclType(Record), 1690 TInfo, 1691 SC); 1692 } 1693 Anon->setImplicit(); 1694 1695 // Add the anonymous struct/union object to the current 1696 // context. We'll be referencing this object when we refer to one of 1697 // its members. 1698 Owner->addDecl(Anon); 1699 1700 // Inject the members of the anonymous struct/union into the owning 1701 // context and into the identifier resolver chain for name lookup 1702 // purposes. 1703 if (InjectAnonymousStructOrUnionMembers(S, Owner, Record)) 1704 Invalid = true; 1705 1706 // Mark this as an anonymous struct/union type. Note that we do not 1707 // do this until after we have already checked and injected the 1708 // members of this anonymous struct/union type, because otherwise 1709 // the members could be injected twice: once by DeclContext when it 1710 // builds its lookup table, and once by 1711 // InjectAnonymousStructOrUnionMembers. 1712 Record->setAnonymousStructOrUnion(true); 1713 1714 if (Invalid) 1715 Anon->setInvalidDecl(); 1716 1717 return DeclPtrTy::make(Anon); 1718} 1719 1720 1721/// GetNameForDeclarator - Determine the full declaration name for the 1722/// given Declarator. 1723DeclarationName Sema::GetNameForDeclarator(Declarator &D) { 1724 return GetNameFromUnqualifiedId(D.getName()); 1725} 1726 1727/// \brief Retrieves the canonicalized name from a parsed unqualified-id. 1728DeclarationName Sema::GetNameFromUnqualifiedId(const UnqualifiedId &Name) { 1729 switch (Name.getKind()) { 1730 case UnqualifiedId::IK_Identifier: 1731 return DeclarationName(Name.Identifier); 1732 1733 case UnqualifiedId::IK_OperatorFunctionId: 1734 return Context.DeclarationNames.getCXXOperatorName( 1735 Name.OperatorFunctionId.Operator); 1736 1737 case UnqualifiedId::IK_LiteralOperatorId: 1738 return Context.DeclarationNames.getCXXLiteralOperatorName( 1739 Name.Identifier); 1740 1741 case UnqualifiedId::IK_ConversionFunctionId: { 1742 QualType Ty = GetTypeFromParser(Name.ConversionFunctionId); 1743 if (Ty.isNull()) 1744 return DeclarationName(); 1745 1746 return Context.DeclarationNames.getCXXConversionFunctionName( 1747 Context.getCanonicalType(Ty)); 1748 } 1749 1750 case UnqualifiedId::IK_ConstructorName: { 1751 QualType Ty = GetTypeFromParser(Name.ConstructorName); 1752 if (Ty.isNull()) 1753 return DeclarationName(); 1754 1755 return Context.DeclarationNames.getCXXConstructorName( 1756 Context.getCanonicalType(Ty)); 1757 } 1758 1759 case UnqualifiedId::IK_ConstructorTemplateId: { 1760 // In well-formed code, we can only have a constructor 1761 // template-id that refers to the current context, so go there 1762 // to find the actual type being constructed. 1763 CXXRecordDecl *CurClass = dyn_cast<CXXRecordDecl>(CurContext); 1764 if (!CurClass || CurClass->getIdentifier() != Name.TemplateId->Name) 1765 return DeclarationName(); 1766 1767 // Determine the type of the class being constructed. 1768 QualType CurClassType; 1769 if (ClassTemplateDecl *ClassTemplate 1770 = CurClass->getDescribedClassTemplate()) 1771 CurClassType = ClassTemplate->getInjectedClassNameType(Context); 1772 else 1773 CurClassType = Context.getTypeDeclType(CurClass); 1774 1775 // FIXME: Check two things: that the template-id names the same type as 1776 // CurClassType, and that the template-id does not occur when the name 1777 // was qualified. 1778 1779 return Context.DeclarationNames.getCXXConstructorName( 1780 Context.getCanonicalType(CurClassType)); 1781 } 1782 1783 case UnqualifiedId::IK_DestructorName: { 1784 QualType Ty = GetTypeFromParser(Name.DestructorName); 1785 if (Ty.isNull()) 1786 return DeclarationName(); 1787 1788 return Context.DeclarationNames.getCXXDestructorName( 1789 Context.getCanonicalType(Ty)); 1790 } 1791 1792 case UnqualifiedId::IK_TemplateId: { 1793 TemplateName TName 1794 = TemplateName::getFromVoidPointer(Name.TemplateId->Template); 1795 return Context.getNameForTemplate(TName); 1796 } 1797 } 1798 1799 assert(false && "Unknown name kind"); 1800 return DeclarationName(); 1801} 1802 1803/// isNearlyMatchingFunction - Determine whether the C++ functions 1804/// Declaration and Definition are "nearly" matching. This heuristic 1805/// is used to improve diagnostics in the case where an out-of-line 1806/// function definition doesn't match any declaration within 1807/// the class or namespace. 1808static bool isNearlyMatchingFunction(ASTContext &Context, 1809 FunctionDecl *Declaration, 1810 FunctionDecl *Definition) { 1811 if (Declaration->param_size() != Definition->param_size()) 1812 return false; 1813 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 1814 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 1815 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 1816 1817 if (!Context.hasSameUnqualifiedType(DeclParamTy.getNonReferenceType(), 1818 DefParamTy.getNonReferenceType())) 1819 return false; 1820 } 1821 1822 return true; 1823} 1824 1825Sema::DeclPtrTy 1826Sema::HandleDeclarator(Scope *S, Declarator &D, 1827 MultiTemplateParamsArg TemplateParamLists, 1828 bool IsFunctionDefinition) { 1829 DeclarationName Name = GetNameForDeclarator(D); 1830 1831 // All of these full declarators require an identifier. If it doesn't have 1832 // one, the ParsedFreeStandingDeclSpec action should be used. 1833 if (!Name) { 1834 if (!D.isInvalidType()) // Reject this if we think it is valid. 1835 Diag(D.getDeclSpec().getSourceRange().getBegin(), 1836 diag::err_declarator_need_ident) 1837 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 1838 return DeclPtrTy(); 1839 } 1840 1841 // The scope passed in may not be a decl scope. Zip up the scope tree until 1842 // we find one that is. 1843 while ((S->getFlags() & Scope::DeclScope) == 0 || 1844 (S->getFlags() & Scope::TemplateParamScope) != 0) 1845 S = S->getParent(); 1846 1847 // If this is an out-of-line definition of a member of a class template 1848 // or class template partial specialization, we may need to rebuild the 1849 // type specifier in the declarator. See RebuildTypeInCurrentInstantiation() 1850 // for more information. 1851 // FIXME: cope with decltype(expr) and typeof(expr) once the rebuilder can 1852 // handle expressions properly. 1853 DeclSpec &DS = const_cast<DeclSpec&>(D.getDeclSpec()); 1854 if (D.getCXXScopeSpec().isSet() && !D.getCXXScopeSpec().isInvalid() && 1855 isDependentScopeSpecifier(D.getCXXScopeSpec()) && 1856 (DS.getTypeSpecType() == DeclSpec::TST_typename || 1857 DS.getTypeSpecType() == DeclSpec::TST_typeofType || 1858 DS.getTypeSpecType() == DeclSpec::TST_typeofExpr || 1859 DS.getTypeSpecType() == DeclSpec::TST_decltype)) { 1860 if (DeclContext *DC = computeDeclContext(D.getCXXScopeSpec(), true)) { 1861 // FIXME: Preserve type source info. 1862 QualType T = GetTypeFromParser(DS.getTypeRep()); 1863 1864 DeclContext *SavedContext = CurContext; 1865 CurContext = DC; 1866 T = RebuildTypeInCurrentInstantiation(T, D.getIdentifierLoc(), Name); 1867 CurContext = SavedContext; 1868 1869 if (T.isNull()) 1870 return DeclPtrTy(); 1871 DS.UpdateTypeRep(T.getAsOpaquePtr()); 1872 } 1873 } 1874 1875 DeclContext *DC; 1876 NamedDecl *New; 1877 1878 TypeSourceInfo *TInfo = 0; 1879 QualType R = GetTypeForDeclarator(D, S, &TInfo); 1880 1881 LookupResult Previous(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 1882 ForRedeclaration); 1883 1884 // See if this is a redefinition of a variable in the same scope. 1885 if (D.getCXXScopeSpec().isInvalid()) { 1886 DC = CurContext; 1887 D.setInvalidType(); 1888 } else if (!D.getCXXScopeSpec().isSet()) { 1889 bool IsLinkageLookup = false; 1890 1891 // If the declaration we're planning to build will be a function 1892 // or object with linkage, then look for another declaration with 1893 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 1894 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 1895 /* Do nothing*/; 1896 else if (R->isFunctionType()) { 1897 if (CurContext->isFunctionOrMethod() || 1898 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 1899 IsLinkageLookup = true; 1900 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 1901 IsLinkageLookup = true; 1902 else if (CurContext->getLookupContext()->isTranslationUnit() && 1903 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 1904 IsLinkageLookup = true; 1905 1906 if (IsLinkageLookup) 1907 Previous.clear(LookupRedeclarationWithLinkage); 1908 1909 DC = CurContext; 1910 LookupName(Previous, S, /* CreateBuiltins = */ IsLinkageLookup); 1911 } else { // Something like "int foo::x;" 1912 DC = computeDeclContext(D.getCXXScopeSpec(), true); 1913 1914 if (!DC) { 1915 // If we could not compute the declaration context, it's because the 1916 // declaration context is dependent but does not refer to a class, 1917 // class template, or class template partial specialization. Complain 1918 // and return early, to avoid the coming semantic disaster. 1919 Diag(D.getIdentifierLoc(), 1920 diag::err_template_qualified_declarator_no_match) 1921 << (NestedNameSpecifier*)D.getCXXScopeSpec().getScopeRep() 1922 << D.getCXXScopeSpec().getRange(); 1923 return DeclPtrTy(); 1924 } 1925 1926 if (!DC->isDependentContext() && 1927 RequireCompleteDeclContext(D.getCXXScopeSpec())) 1928 return DeclPtrTy(); 1929 1930 if (isa<CXXRecordDecl>(DC) && !cast<CXXRecordDecl>(DC)->hasDefinition()) { 1931 Diag(D.getIdentifierLoc(), 1932 diag::err_member_def_undefined_record) 1933 << Name << DC << D.getCXXScopeSpec().getRange(); 1934 D.setInvalidType(); 1935 } 1936 1937 LookupQualifiedName(Previous, DC); 1938 1939 // Don't consider using declarations as previous declarations for 1940 // out-of-line members. 1941 RemoveUsingDecls(Previous); 1942 1943 // C++ 7.3.1.2p2: 1944 // Members (including explicit specializations of templates) of a named 1945 // namespace can also be defined outside that namespace by explicit 1946 // qualification of the name being defined, provided that the entity being 1947 // defined was already declared in the namespace and the definition appears 1948 // after the point of declaration in a namespace that encloses the 1949 // declarations namespace. 1950 // 1951 // Note that we only check the context at this point. We don't yet 1952 // have enough information to make sure that PrevDecl is actually 1953 // the declaration we want to match. For example, given: 1954 // 1955 // class X { 1956 // void f(); 1957 // void f(float); 1958 // }; 1959 // 1960 // void X::f(int) { } // ill-formed 1961 // 1962 // In this case, PrevDecl will point to the overload set 1963 // containing the two f's declared in X, but neither of them 1964 // matches. 1965 1966 // First check whether we named the global scope. 1967 if (isa<TranslationUnitDecl>(DC)) { 1968 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 1969 << Name << D.getCXXScopeSpec().getRange(); 1970 } else { 1971 DeclContext *Cur = CurContext; 1972 while (isa<LinkageSpecDecl>(Cur)) 1973 Cur = Cur->getParent(); 1974 if (!Cur->Encloses(DC)) { 1975 // The qualifying scope doesn't enclose the original declaration. 1976 // Emit diagnostic based on current scope. 1977 SourceLocation L = D.getIdentifierLoc(); 1978 SourceRange R = D.getCXXScopeSpec().getRange(); 1979 if (isa<FunctionDecl>(Cur)) 1980 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 1981 else 1982 Diag(L, diag::err_invalid_declarator_scope) 1983 << Name << cast<NamedDecl>(DC) << R; 1984 D.setInvalidType(); 1985 } 1986 } 1987 } 1988 1989 if (Previous.isSingleResult() && 1990 Previous.getFoundDecl()->isTemplateParameter()) { 1991 // Maybe we will complain about the shadowed template parameter. 1992 if (!D.isInvalidType()) 1993 if (DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), 1994 Previous.getFoundDecl())) 1995 D.setInvalidType(); 1996 1997 // Just pretend that we didn't see the previous declaration. 1998 Previous.clear(); 1999 } 2000 2001 // In C++, the previous declaration we find might be a tag type 2002 // (class or enum). In this case, the new declaration will hide the 2003 // tag type. Note that this does does not apply if we're declaring a 2004 // typedef (C++ [dcl.typedef]p4). 2005 if (Previous.isSingleTagDecl() && 2006 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 2007 Previous.clear(); 2008 2009 bool Redeclaration = false; 2010 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 2011 if (TemplateParamLists.size()) { 2012 Diag(D.getIdentifierLoc(), diag::err_template_typedef); 2013 return DeclPtrTy(); 2014 } 2015 2016 New = ActOnTypedefDeclarator(S, D, DC, R, TInfo, Previous, Redeclaration); 2017 } else if (R->isFunctionType()) { 2018 New = ActOnFunctionDeclarator(S, D, DC, R, TInfo, Previous, 2019 move(TemplateParamLists), 2020 IsFunctionDefinition, Redeclaration); 2021 } else { 2022 New = ActOnVariableDeclarator(S, D, DC, R, TInfo, Previous, 2023 move(TemplateParamLists), 2024 Redeclaration); 2025 } 2026 2027 if (New == 0) 2028 return DeclPtrTy(); 2029 2030 // If this has an identifier and is not an invalid redeclaration or 2031 // function template specialization, add it to the scope stack. 2032 if (Name && !(Redeclaration && New->isInvalidDecl())) 2033 PushOnScopeChains(New, S); 2034 2035 return DeclPtrTy::make(New); 2036} 2037 2038/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 2039/// types into constant array types in certain situations which would otherwise 2040/// be errors (for GCC compatibility). 2041static QualType TryToFixInvalidVariablyModifiedType(QualType T, 2042 ASTContext &Context, 2043 bool &SizeIsNegative) { 2044 // This method tries to turn a variable array into a constant 2045 // array even when the size isn't an ICE. This is necessary 2046 // for compatibility with code that depends on gcc's buggy 2047 // constant expression folding, like struct {char x[(int)(char*)2];} 2048 SizeIsNegative = false; 2049 2050 QualifierCollector Qs; 2051 const Type *Ty = Qs.strip(T); 2052 2053 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) { 2054 QualType Pointee = PTy->getPointeeType(); 2055 QualType FixedType = 2056 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative); 2057 if (FixedType.isNull()) return FixedType; 2058 FixedType = Context.getPointerType(FixedType); 2059 return Qs.apply(FixedType); 2060 } 2061 2062 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 2063 if (!VLATy) 2064 return QualType(); 2065 // FIXME: We should probably handle this case 2066 if (VLATy->getElementType()->isVariablyModifiedType()) 2067 return QualType(); 2068 2069 Expr::EvalResult EvalResult; 2070 if (!VLATy->getSizeExpr() || 2071 !VLATy->getSizeExpr()->Evaluate(EvalResult, Context) || 2072 !EvalResult.Val.isInt()) 2073 return QualType(); 2074 2075 llvm::APSInt &Res = EvalResult.Val.getInt(); 2076 if (Res >= llvm::APSInt(Res.getBitWidth(), Res.isUnsigned())) { 2077 // TODO: preserve the size expression in declarator info 2078 return Context.getConstantArrayType(VLATy->getElementType(), 2079 Res, ArrayType::Normal, 0); 2080 } 2081 2082 SizeIsNegative = true; 2083 return QualType(); 2084} 2085 2086/// \brief Register the given locally-scoped external C declaration so 2087/// that it can be found later for redeclarations 2088void 2089Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, 2090 const LookupResult &Previous, 2091 Scope *S) { 2092 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 2093 "Decl is not a locally-scoped decl!"); 2094 // Note that we have a locally-scoped external with this name. 2095 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 2096 2097 if (!Previous.isSingleResult()) 2098 return; 2099 2100 NamedDecl *PrevDecl = Previous.getFoundDecl(); 2101 2102 // If there was a previous declaration of this variable, it may be 2103 // in our identifier chain. Update the identifier chain with the new 2104 // declaration. 2105 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 2106 // The previous declaration was found on the identifer resolver 2107 // chain, so remove it from its scope. 2108 while (S && !S->isDeclScope(DeclPtrTy::make(PrevDecl))) 2109 S = S->getParent(); 2110 2111 if (S) 2112 S->RemoveDecl(DeclPtrTy::make(PrevDecl)); 2113 } 2114} 2115 2116/// \brief Diagnose function specifiers on a declaration of an identifier that 2117/// does not identify a function. 2118void Sema::DiagnoseFunctionSpecifiers(Declarator& D) { 2119 // FIXME: We should probably indicate the identifier in question to avoid 2120 // confusion for constructs like "inline int a(), b;" 2121 if (D.getDeclSpec().isInlineSpecified()) 2122 Diag(D.getDeclSpec().getInlineSpecLoc(), 2123 diag::err_inline_non_function); 2124 2125 if (D.getDeclSpec().isVirtualSpecified()) 2126 Diag(D.getDeclSpec().getVirtualSpecLoc(), 2127 diag::err_virtual_non_function); 2128 2129 if (D.getDeclSpec().isExplicitSpecified()) 2130 Diag(D.getDeclSpec().getExplicitSpecLoc(), 2131 diag::err_explicit_non_function); 2132} 2133 2134NamedDecl* 2135Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 2136 QualType R, TypeSourceInfo *TInfo, 2137 LookupResult &Previous, bool &Redeclaration) { 2138 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 2139 if (D.getCXXScopeSpec().isSet()) { 2140 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 2141 << D.getCXXScopeSpec().getRange(); 2142 D.setInvalidType(); 2143 // Pretend we didn't see the scope specifier. 2144 DC = 0; 2145 } 2146 2147 if (getLangOptions().CPlusPlus) { 2148 // Check that there are no default arguments (C++ only). 2149 CheckExtraCXXDefaultArguments(D); 2150 } 2151 2152 DiagnoseFunctionSpecifiers(D); 2153 2154 if (D.getDeclSpec().isThreadSpecified()) 2155 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 2156 2157 TypedefDecl *NewTD = ParseTypedefDecl(S, D, R, TInfo); 2158 if (!NewTD) return 0; 2159 2160 // Handle attributes prior to checking for duplicates in MergeVarDecl 2161 ProcessDeclAttributes(S, NewTD, D); 2162 2163 // Merge the decl with the existing one if appropriate. If the decl is 2164 // in an outer scope, it isn't the same thing. 2165 FilterLookupForScope(*this, Previous, DC, S, /*ConsiderLinkage*/ false); 2166 if (!Previous.empty()) { 2167 Redeclaration = true; 2168 MergeTypeDefDecl(NewTD, Previous); 2169 } 2170 2171 // C99 6.7.7p2: If a typedef name specifies a variably modified type 2172 // then it shall have block scope. 2173 QualType T = NewTD->getUnderlyingType(); 2174 if (T->isVariablyModifiedType()) { 2175 CurFunctionNeedsScopeChecking = true; 2176 2177 if (S->getFnParent() == 0) { 2178 bool SizeIsNegative; 2179 QualType FixedTy = 2180 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative); 2181 if (!FixedTy.isNull()) { 2182 Diag(D.getIdentifierLoc(), diag::warn_illegal_constant_array_size); 2183 NewTD->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(FixedTy)); 2184 } else { 2185 if (SizeIsNegative) 2186 Diag(D.getIdentifierLoc(), diag::err_typecheck_negative_array_size); 2187 else if (T->isVariableArrayType()) 2188 Diag(D.getIdentifierLoc(), diag::err_vla_decl_in_file_scope); 2189 else 2190 Diag(D.getIdentifierLoc(), diag::err_vm_decl_in_file_scope); 2191 NewTD->setInvalidDecl(); 2192 } 2193 } 2194 } 2195 2196 // If this is the C FILE type, notify the AST context. 2197 if (IdentifierInfo *II = NewTD->getIdentifier()) 2198 if (!NewTD->isInvalidDecl() && 2199 NewTD->getDeclContext()->getLookupContext()->isTranslationUnit()) { 2200 if (II->isStr("FILE")) 2201 Context.setFILEDecl(NewTD); 2202 else if (II->isStr("jmp_buf")) 2203 Context.setjmp_bufDecl(NewTD); 2204 else if (II->isStr("sigjmp_buf")) 2205 Context.setsigjmp_bufDecl(NewTD); 2206 } 2207 2208 return NewTD; 2209} 2210 2211/// \brief Determines whether the given declaration is an out-of-scope 2212/// previous declaration. 2213/// 2214/// This routine should be invoked when name lookup has found a 2215/// previous declaration (PrevDecl) that is not in the scope where a 2216/// new declaration by the same name is being introduced. If the new 2217/// declaration occurs in a local scope, previous declarations with 2218/// linkage may still be considered previous declarations (C99 2219/// 6.2.2p4-5, C++ [basic.link]p6). 2220/// 2221/// \param PrevDecl the previous declaration found by name 2222/// lookup 2223/// 2224/// \param DC the context in which the new declaration is being 2225/// declared. 2226/// 2227/// \returns true if PrevDecl is an out-of-scope previous declaration 2228/// for a new delcaration with the same name. 2229static bool 2230isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 2231 ASTContext &Context) { 2232 if (!PrevDecl) 2233 return 0; 2234 2235 if (!PrevDecl->hasLinkage()) 2236 return false; 2237 2238 if (Context.getLangOptions().CPlusPlus) { 2239 // C++ [basic.link]p6: 2240 // If there is a visible declaration of an entity with linkage 2241 // having the same name and type, ignoring entities declared 2242 // outside the innermost enclosing namespace scope, the block 2243 // scope declaration declares that same entity and receives the 2244 // linkage of the previous declaration. 2245 DeclContext *OuterContext = DC->getLookupContext(); 2246 if (!OuterContext->isFunctionOrMethod()) 2247 // This rule only applies to block-scope declarations. 2248 return false; 2249 else { 2250 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 2251 if (PrevOuterContext->isRecord()) 2252 // We found a member function: ignore it. 2253 return false; 2254 else { 2255 // Find the innermost enclosing namespace for the new and 2256 // previous declarations. 2257 while (!OuterContext->isFileContext()) 2258 OuterContext = OuterContext->getParent(); 2259 while (!PrevOuterContext->isFileContext()) 2260 PrevOuterContext = PrevOuterContext->getParent(); 2261 2262 // The previous declaration is in a different namespace, so it 2263 // isn't the same function. 2264 if (OuterContext->getPrimaryContext() != 2265 PrevOuterContext->getPrimaryContext()) 2266 return false; 2267 } 2268 } 2269 } 2270 2271 return true; 2272} 2273 2274NamedDecl* 2275Sema::ActOnVariableDeclarator(Scope* S, Declarator& D, DeclContext* DC, 2276 QualType R, TypeSourceInfo *TInfo, 2277 LookupResult &Previous, 2278 MultiTemplateParamsArg TemplateParamLists, 2279 bool &Redeclaration) { 2280 DeclarationName Name = GetNameForDeclarator(D); 2281 2282 // Check that there are no default arguments (C++ only). 2283 if (getLangOptions().CPlusPlus) 2284 CheckExtraCXXDefaultArguments(D); 2285 2286 VarDecl *NewVD; 2287 VarDecl::StorageClass SC; 2288 switch (D.getDeclSpec().getStorageClassSpec()) { 2289 default: assert(0 && "Unknown storage class!"); 2290 case DeclSpec::SCS_unspecified: SC = VarDecl::None; break; 2291 case DeclSpec::SCS_extern: SC = VarDecl::Extern; break; 2292 case DeclSpec::SCS_static: SC = VarDecl::Static; break; 2293 case DeclSpec::SCS_auto: SC = VarDecl::Auto; break; 2294 case DeclSpec::SCS_register: SC = VarDecl::Register; break; 2295 case DeclSpec::SCS_private_extern: SC = VarDecl::PrivateExtern; break; 2296 case DeclSpec::SCS_mutable: 2297 // mutable can only appear on non-static class members, so it's always 2298 // an error here 2299 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 2300 D.setInvalidType(); 2301 SC = VarDecl::None; 2302 break; 2303 } 2304 2305 IdentifierInfo *II = Name.getAsIdentifierInfo(); 2306 if (!II) { 2307 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 2308 << Name.getAsString(); 2309 return 0; 2310 } 2311 2312 DiagnoseFunctionSpecifiers(D); 2313 2314 if (!DC->isRecord() && S->getFnParent() == 0) { 2315 // C99 6.9p2: The storage-class specifiers auto and register shall not 2316 // appear in the declaration specifiers in an external declaration. 2317 if (SC == VarDecl::Auto || SC == VarDecl::Register) { 2318 2319 // If this is a register variable with an asm label specified, then this 2320 // is a GNU extension. 2321 if (SC == VarDecl::Register && D.getAsmLabel()) 2322 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register); 2323 else 2324 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 2325 D.setInvalidType(); 2326 } 2327 } 2328 if (DC->isRecord() && !CurContext->isRecord()) { 2329 // This is an out-of-line definition of a static data member. 2330 if (SC == VarDecl::Static) { 2331 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2332 diag::err_static_out_of_line) 2333 << CodeModificationHint::CreateRemoval( 2334 D.getDeclSpec().getStorageClassSpecLoc()); 2335 } else if (SC == VarDecl::None) 2336 SC = VarDecl::Static; 2337 } 2338 if (SC == VarDecl::Static) { 2339 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) { 2340 if (RD->isLocalClass()) 2341 Diag(D.getIdentifierLoc(), 2342 diag::err_static_data_member_not_allowed_in_local_class) 2343 << Name << RD->getDeclName(); 2344 } 2345 } 2346 2347 // Match up the template parameter lists with the scope specifier, then 2348 // determine whether we have a template or a template specialization. 2349 bool isExplicitSpecialization = false; 2350 if (TemplateParameterList *TemplateParams 2351 = MatchTemplateParametersToScopeSpecifier( 2352 D.getDeclSpec().getSourceRange().getBegin(), 2353 D.getCXXScopeSpec(), 2354 (TemplateParameterList**)TemplateParamLists.get(), 2355 TemplateParamLists.size(), 2356 isExplicitSpecialization)) { 2357 if (TemplateParams->size() > 0) { 2358 // There is no such thing as a variable template. 2359 Diag(D.getIdentifierLoc(), diag::err_template_variable) 2360 << II 2361 << SourceRange(TemplateParams->getTemplateLoc(), 2362 TemplateParams->getRAngleLoc()); 2363 return 0; 2364 } else { 2365 // There is an extraneous 'template<>' for this variable. Complain 2366 // about it, but allow the declaration of the variable. 2367 Diag(TemplateParams->getTemplateLoc(), 2368 diag::err_template_variable_noparams) 2369 << II 2370 << SourceRange(TemplateParams->getTemplateLoc(), 2371 TemplateParams->getRAngleLoc()); 2372 2373 isExplicitSpecialization = true; 2374 } 2375 } 2376 2377 NewVD = VarDecl::Create(Context, DC, D.getIdentifierLoc(), 2378 II, R, TInfo, SC); 2379 2380 if (D.isInvalidType()) 2381 NewVD->setInvalidDecl(); 2382 2383 if (D.getDeclSpec().isThreadSpecified()) { 2384 if (NewVD->hasLocalStorage()) 2385 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global); 2386 else if (!Context.Target.isTLSSupported()) 2387 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported); 2388 else 2389 NewVD->setThreadSpecified(true); 2390 } 2391 2392 // Set the lexical context. If the declarator has a C++ scope specifier, the 2393 // lexical context will be different from the semantic context. 2394 NewVD->setLexicalDeclContext(CurContext); 2395 2396 // Handle attributes prior to checking for duplicates in MergeVarDecl 2397 ProcessDeclAttributes(S, NewVD, D); 2398 2399 // Handle GNU asm-label extension (encoded as an attribute). 2400 if (Expr *E = (Expr*) D.getAsmLabel()) { 2401 // The parser guarantees this is a string. 2402 StringLiteral *SE = cast<StringLiteral>(E); 2403 NewVD->addAttr(::new (Context) AsmLabelAttr(Context, SE->getString())); 2404 } 2405 2406 // Don't consider existing declarations that are in a different 2407 // scope and are out-of-semantic-context declarations (if the new 2408 // declaration has linkage). 2409 FilterLookupForScope(*this, Previous, DC, S, NewVD->hasLinkage()); 2410 2411 // Merge the decl with the existing one if appropriate. 2412 if (!Previous.empty()) { 2413 if (Previous.isSingleResult() && 2414 isa<FieldDecl>(Previous.getFoundDecl()) && 2415 D.getCXXScopeSpec().isSet()) { 2416 // The user tried to define a non-static data member 2417 // out-of-line (C++ [dcl.meaning]p1). 2418 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 2419 << D.getCXXScopeSpec().getRange(); 2420 Previous.clear(); 2421 NewVD->setInvalidDecl(); 2422 } 2423 } else if (D.getCXXScopeSpec().isSet()) { 2424 // No previous declaration in the qualifying scope. 2425 Diag(D.getIdentifierLoc(), diag::err_no_member) 2426 << Name << computeDeclContext(D.getCXXScopeSpec(), true) 2427 << D.getCXXScopeSpec().getRange(); 2428 NewVD->setInvalidDecl(); 2429 } 2430 2431 CheckVariableDeclaration(NewVD, Previous, Redeclaration); 2432 2433 // This is an explicit specialization of a static data member. Check it. 2434 if (isExplicitSpecialization && !NewVD->isInvalidDecl() && 2435 CheckMemberSpecialization(NewVD, Previous)) 2436 NewVD->setInvalidDecl(); 2437 2438 // attributes declared post-definition are currently ignored 2439 if (Previous.isSingleResult()) { 2440 VarDecl *Def = dyn_cast<VarDecl>(Previous.getFoundDecl()); 2441 if (Def && (Def = Def->getDefinition()) && 2442 Def != NewVD && D.hasAttributes()) { 2443 Diag(NewVD->getLocation(), diag::warn_attribute_precede_definition); 2444 Diag(Def->getLocation(), diag::note_previous_definition); 2445 } 2446 } 2447 2448 // If this is a locally-scoped extern C variable, update the map of 2449 // such variables. 2450 if (CurContext->isFunctionOrMethod() && NewVD->isExternC() && 2451 !NewVD->isInvalidDecl()) 2452 RegisterLocallyScopedExternCDecl(NewVD, Previous, S); 2453 2454 return NewVD; 2455} 2456 2457/// \brief Perform semantic checking on a newly-created variable 2458/// declaration. 2459/// 2460/// This routine performs all of the type-checking required for a 2461/// variable declaration once it has been built. It is used both to 2462/// check variables after they have been parsed and their declarators 2463/// have been translated into a declaration, and to check variables 2464/// that have been instantiated from a template. 2465/// 2466/// Sets NewVD->isInvalidDecl() if an error was encountered. 2467void Sema::CheckVariableDeclaration(VarDecl *NewVD, 2468 LookupResult &Previous, 2469 bool &Redeclaration) { 2470 // If the decl is already known invalid, don't check it. 2471 if (NewVD->isInvalidDecl()) 2472 return; 2473 2474 QualType T = NewVD->getType(); 2475 2476 if (T->isObjCInterfaceType()) { 2477 Diag(NewVD->getLocation(), diag::err_statically_allocated_object); 2478 return NewVD->setInvalidDecl(); 2479 } 2480 2481 // Emit an error if an address space was applied to decl with local storage. 2482 // This includes arrays of objects with address space qualifiers, but not 2483 // automatic variables that point to other address spaces. 2484 // ISO/IEC TR 18037 S5.1.2 2485 if (NewVD->hasLocalStorage() && (T.getAddressSpace() != 0)) { 2486 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 2487 return NewVD->setInvalidDecl(); 2488 } 2489 2490 if (NewVD->hasLocalStorage() && T.isObjCGCWeak() 2491 && !NewVD->hasAttr<BlocksAttr>()) 2492 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 2493 2494 bool isVM = T->isVariablyModifiedType(); 2495 if (isVM || NewVD->hasAttr<CleanupAttr>() || 2496 NewVD->hasAttr<BlocksAttr>()) 2497 CurFunctionNeedsScopeChecking = true; 2498 2499 if ((isVM && NewVD->hasLinkage()) || 2500 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { 2501 bool SizeIsNegative; 2502 QualType FixedTy = 2503 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative); 2504 2505 if (FixedTy.isNull() && T->isVariableArrayType()) { 2506 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 2507 // FIXME: This won't give the correct result for 2508 // int a[10][n]; 2509 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 2510 2511 if (NewVD->isFileVarDecl()) 2512 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 2513 << SizeRange; 2514 else if (NewVD->getStorageClass() == VarDecl::Static) 2515 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 2516 << SizeRange; 2517 else 2518 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 2519 << SizeRange; 2520 return NewVD->setInvalidDecl(); 2521 } 2522 2523 if (FixedTy.isNull()) { 2524 if (NewVD->isFileVarDecl()) 2525 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 2526 else 2527 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 2528 return NewVD->setInvalidDecl(); 2529 } 2530 2531 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 2532 NewVD->setType(FixedTy); 2533 } 2534 2535 if (Previous.empty() && NewVD->isExternC()) { 2536 // Since we did not find anything by this name and we're declaring 2537 // an extern "C" variable, look for a non-visible extern "C" 2538 // declaration with the same name. 2539 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 2540 = LocallyScopedExternalDecls.find(NewVD->getDeclName()); 2541 if (Pos != LocallyScopedExternalDecls.end()) 2542 Previous.addDecl(Pos->second); 2543 } 2544 2545 if (T->isVoidType() && !NewVD->hasExternalStorage()) { 2546 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 2547 << T; 2548 return NewVD->setInvalidDecl(); 2549 } 2550 2551 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { 2552 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); 2553 return NewVD->setInvalidDecl(); 2554 } 2555 2556 if (isVM && NewVD->hasAttr<BlocksAttr>()) { 2557 Diag(NewVD->getLocation(), diag::err_block_on_vm); 2558 return NewVD->setInvalidDecl(); 2559 } 2560 2561 if (!Previous.empty()) { 2562 Redeclaration = true; 2563 MergeVarDecl(NewVD, Previous); 2564 } 2565} 2566 2567/// \brief Data used with FindOverriddenMethod 2568struct FindOverriddenMethodData { 2569 Sema *S; 2570 CXXMethodDecl *Method; 2571}; 2572 2573/// \brief Member lookup function that determines whether a given C++ 2574/// method overrides a method in a base class, to be used with 2575/// CXXRecordDecl::lookupInBases(). 2576static bool FindOverriddenMethod(const CXXBaseSpecifier *Specifier, 2577 CXXBasePath &Path, 2578 void *UserData) { 2579 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 2580 2581 FindOverriddenMethodData *Data 2582 = reinterpret_cast<FindOverriddenMethodData*>(UserData); 2583 2584 DeclarationName Name = Data->Method->getDeclName(); 2585 2586 // FIXME: Do we care about other names here too? 2587 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 2588 // We really want to find the base class constructor here. 2589 QualType T = Data->S->Context.getTypeDeclType(BaseRecord); 2590 CanQualType CT = Data->S->Context.getCanonicalType(T); 2591 2592 Name = Data->S->Context.DeclarationNames.getCXXDestructorName(CT); 2593 } 2594 2595 for (Path.Decls = BaseRecord->lookup(Name); 2596 Path.Decls.first != Path.Decls.second; 2597 ++Path.Decls.first) { 2598 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*Path.Decls.first)) { 2599 if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD)) 2600 return true; 2601 } 2602 } 2603 2604 return false; 2605} 2606 2607/// AddOverriddenMethods - See if a method overrides any in the base classes, 2608/// and if so, check that it's a valid override and remember it. 2609void Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 2610 // Look for virtual methods in base classes that this method might override. 2611 CXXBasePaths Paths; 2612 FindOverriddenMethodData Data; 2613 Data.Method = MD; 2614 Data.S = this; 2615 if (DC->lookupInBases(&FindOverriddenMethod, &Data, Paths)) { 2616 for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(), 2617 E = Paths.found_decls_end(); I != E; ++I) { 2618 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) { 2619 if (!CheckOverridingFunctionReturnType(MD, OldMD) && 2620 !CheckOverridingFunctionExceptionSpec(MD, OldMD) && 2621 !CheckOverridingFunctionAttributes(MD, OldMD)) 2622 MD->addOverriddenMethod(OldMD->getCanonicalDecl()); 2623 } 2624 } 2625 } 2626} 2627 2628NamedDecl* 2629Sema::ActOnFunctionDeclarator(Scope* S, Declarator& D, DeclContext* DC, 2630 QualType R, TypeSourceInfo *TInfo, 2631 LookupResult &Previous, 2632 MultiTemplateParamsArg TemplateParamLists, 2633 bool IsFunctionDefinition, bool &Redeclaration) { 2634 assert(R.getTypePtr()->isFunctionType()); 2635 2636 DeclarationName Name = GetNameForDeclarator(D); 2637 FunctionDecl::StorageClass SC = FunctionDecl::None; 2638 switch (D.getDeclSpec().getStorageClassSpec()) { 2639 default: assert(0 && "Unknown storage class!"); 2640 case DeclSpec::SCS_auto: 2641 case DeclSpec::SCS_register: 2642 case DeclSpec::SCS_mutable: 2643 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2644 diag::err_typecheck_sclass_func); 2645 D.setInvalidType(); 2646 break; 2647 case DeclSpec::SCS_unspecified: SC = FunctionDecl::None; break; 2648 case DeclSpec::SCS_extern: SC = FunctionDecl::Extern; break; 2649 case DeclSpec::SCS_static: { 2650 if (CurContext->getLookupContext()->isFunctionOrMethod()) { 2651 // C99 6.7.1p5: 2652 // The declaration of an identifier for a function that has 2653 // block scope shall have no explicit storage-class specifier 2654 // other than extern 2655 // See also (C++ [dcl.stc]p4). 2656 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2657 diag::err_static_block_func); 2658 SC = FunctionDecl::None; 2659 } else 2660 SC = FunctionDecl::Static; 2661 break; 2662 } 2663 case DeclSpec::SCS_private_extern: SC = FunctionDecl::PrivateExtern;break; 2664 } 2665 2666 if (D.getDeclSpec().isThreadSpecified()) 2667 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 2668 2669 bool isFriend = D.getDeclSpec().isFriendSpecified(); 2670 bool isInline = D.getDeclSpec().isInlineSpecified(); 2671 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2672 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 2673 2674 // Check that the return type is not an abstract class type. 2675 // For record types, this is done by the AbstractClassUsageDiagnoser once 2676 // the class has been completely parsed. 2677 if (!DC->isRecord() && 2678 RequireNonAbstractType(D.getIdentifierLoc(), 2679 R->getAs<FunctionType>()->getResultType(), 2680 diag::err_abstract_type_in_decl, 2681 AbstractReturnType)) 2682 D.setInvalidType(); 2683 2684 // Do not allow returning a objc interface by-value. 2685 if (R->getAs<FunctionType>()->getResultType()->isObjCInterfaceType()) { 2686 Diag(D.getIdentifierLoc(), 2687 diag::err_object_cannot_be_passed_returned_by_value) << 0 2688 << R->getAs<FunctionType>()->getResultType(); 2689 D.setInvalidType(); 2690 } 2691 2692 bool isVirtualOkay = false; 2693 FunctionDecl *NewFD; 2694 2695 if (isFriend) { 2696 // C++ [class.friend]p5 2697 // A function can be defined in a friend declaration of a 2698 // class . . . . Such a function is implicitly inline. 2699 isInline |= IsFunctionDefinition; 2700 } 2701 2702 if (Name.getNameKind() == DeclarationName::CXXConstructorName) { 2703 // This is a C++ constructor declaration. 2704 assert(DC->isRecord() && 2705 "Constructors can only be declared in a member context"); 2706 2707 R = CheckConstructorDeclarator(D, R, SC); 2708 2709 // Create the new declaration 2710 NewFD = CXXConstructorDecl::Create(Context, 2711 cast<CXXRecordDecl>(DC), 2712 D.getIdentifierLoc(), Name, R, TInfo, 2713 isExplicit, isInline, 2714 /*isImplicitlyDeclared=*/false); 2715 } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 2716 // This is a C++ destructor declaration. 2717 if (DC->isRecord()) { 2718 R = CheckDestructorDeclarator(D, SC); 2719 2720 NewFD = CXXDestructorDecl::Create(Context, 2721 cast<CXXRecordDecl>(DC), 2722 D.getIdentifierLoc(), Name, R, 2723 isInline, 2724 /*isImplicitlyDeclared=*/false); 2725 2726 isVirtualOkay = true; 2727 } else { 2728 Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 2729 2730 // Create a FunctionDecl to satisfy the function definition parsing 2731 // code path. 2732 NewFD = FunctionDecl::Create(Context, DC, D.getIdentifierLoc(), 2733 Name, R, TInfo, SC, isInline, 2734 /*hasPrototype=*/true); 2735 D.setInvalidType(); 2736 } 2737 } else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) { 2738 if (!DC->isRecord()) { 2739 Diag(D.getIdentifierLoc(), 2740 diag::err_conv_function_not_member); 2741 return 0; 2742 } 2743 2744 CheckConversionDeclarator(D, R, SC); 2745 NewFD = CXXConversionDecl::Create(Context, cast<CXXRecordDecl>(DC), 2746 D.getIdentifierLoc(), Name, R, TInfo, 2747 isInline, isExplicit); 2748 2749 isVirtualOkay = true; 2750 } else if (DC->isRecord()) { 2751 // If the of the function is the same as the name of the record, then this 2752 // must be an invalid constructor that has a return type. 2753 // (The parser checks for a return type and makes the declarator a 2754 // constructor if it has no return type). 2755 // must have an invalid constructor that has a return type 2756 if (Name.getAsIdentifierInfo() && 2757 Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ 2758 Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 2759 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2760 << SourceRange(D.getIdentifierLoc()); 2761 return 0; 2762 } 2763 2764 bool isStatic = SC == FunctionDecl::Static; 2765 2766 // [class.free]p1: 2767 // Any allocation function for a class T is a static member 2768 // (even if not explicitly declared static). 2769 if (Name.getCXXOverloadedOperator() == OO_New || 2770 Name.getCXXOverloadedOperator() == OO_Array_New) 2771 isStatic = true; 2772 2773 // [class.free]p6 Any deallocation function for a class X is a static member 2774 // (even if not explicitly declared static). 2775 if (Name.getCXXOverloadedOperator() == OO_Delete || 2776 Name.getCXXOverloadedOperator() == OO_Array_Delete) 2777 isStatic = true; 2778 2779 // This is a C++ method declaration. 2780 NewFD = CXXMethodDecl::Create(Context, cast<CXXRecordDecl>(DC), 2781 D.getIdentifierLoc(), Name, R, TInfo, 2782 isStatic, isInline); 2783 2784 isVirtualOkay = !isStatic; 2785 } else { 2786 // Determine whether the function was written with a 2787 // prototype. This true when: 2788 // - we're in C++ (where every function has a prototype), 2789 // - there is a prototype in the declarator, or 2790 // - the type R of the function is some kind of typedef or other reference 2791 // to a type name (which eventually refers to a function type). 2792 bool HasPrototype = 2793 getLangOptions().CPlusPlus || 2794 (D.getNumTypeObjects() && D.getTypeObject(0).Fun.hasPrototype) || 2795 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 2796 2797 NewFD = FunctionDecl::Create(Context, DC, 2798 D.getIdentifierLoc(), 2799 Name, R, TInfo, SC, isInline, HasPrototype); 2800 } 2801 2802 if (D.isInvalidType()) 2803 NewFD->setInvalidDecl(); 2804 2805 // Set the lexical context. If the declarator has a C++ 2806 // scope specifier, or is the object of a friend declaration, the 2807 // lexical context will be different from the semantic context. 2808 NewFD->setLexicalDeclContext(CurContext); 2809 2810 // Match up the template parameter lists with the scope specifier, then 2811 // determine whether we have a template or a template specialization. 2812 FunctionTemplateDecl *FunctionTemplate = 0; 2813 bool isExplicitSpecialization = false; 2814 bool isFunctionTemplateSpecialization = false; 2815 if (TemplateParameterList *TemplateParams 2816 = MatchTemplateParametersToScopeSpecifier( 2817 D.getDeclSpec().getSourceRange().getBegin(), 2818 D.getCXXScopeSpec(), 2819 (TemplateParameterList**)TemplateParamLists.get(), 2820 TemplateParamLists.size(), 2821 isExplicitSpecialization)) { 2822 if (TemplateParams->size() > 0) { 2823 // This is a function template 2824 2825 // Check that we can declare a template here. 2826 if (CheckTemplateDeclScope(S, TemplateParams)) 2827 return 0; 2828 2829 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC, 2830 NewFD->getLocation(), 2831 Name, TemplateParams, 2832 NewFD); 2833 FunctionTemplate->setLexicalDeclContext(CurContext); 2834 NewFD->setDescribedFunctionTemplate(FunctionTemplate); 2835 } else { 2836 // This is a function template specialization. 2837 isFunctionTemplateSpecialization = true; 2838 } 2839 2840 // FIXME: Free this memory properly. 2841 TemplateParamLists.release(); 2842 } 2843 2844 // C++ [dcl.fct.spec]p5: 2845 // The virtual specifier shall only be used in declarations of 2846 // nonstatic class member functions that appear within a 2847 // member-specification of a class declaration; see 10.3. 2848 // 2849 if (isVirtual && !NewFD->isInvalidDecl()) { 2850 if (!isVirtualOkay) { 2851 Diag(D.getDeclSpec().getVirtualSpecLoc(), 2852 diag::err_virtual_non_function); 2853 } else if (!CurContext->isRecord()) { 2854 // 'virtual' was specified outside of the class. 2855 Diag(D.getDeclSpec().getVirtualSpecLoc(), diag::err_virtual_out_of_class) 2856 << CodeModificationHint::CreateRemoval( 2857 D.getDeclSpec().getVirtualSpecLoc()); 2858 } else { 2859 // Okay: Add virtual to the method. 2860 CXXRecordDecl *CurClass = cast<CXXRecordDecl>(DC); 2861 CurClass->setMethodAsVirtual(NewFD); 2862 } 2863 } 2864 2865 // C++ [dcl.fct.spec]p6: 2866 // The explicit specifier shall be used only in the declaration of a 2867 // constructor or conversion function within its class definition; see 12.3.1 2868 // and 12.3.2. 2869 if (isExplicit && !NewFD->isInvalidDecl()) { 2870 if (!CurContext->isRecord()) { 2871 // 'explicit' was specified outside of the class. 2872 Diag(D.getDeclSpec().getExplicitSpecLoc(), 2873 diag::err_explicit_out_of_class) 2874 << CodeModificationHint::CreateRemoval( 2875 D.getDeclSpec().getExplicitSpecLoc()); 2876 } else if (!isa<CXXConstructorDecl>(NewFD) && 2877 !isa<CXXConversionDecl>(NewFD)) { 2878 // 'explicit' was specified on a function that wasn't a constructor 2879 // or conversion function. 2880 Diag(D.getDeclSpec().getExplicitSpecLoc(), 2881 diag::err_explicit_non_ctor_or_conv_function) 2882 << CodeModificationHint::CreateRemoval( 2883 D.getDeclSpec().getExplicitSpecLoc()); 2884 } 2885 } 2886 2887 // Filter out previous declarations that don't match the scope. 2888 FilterLookupForScope(*this, Previous, DC, S, NewFD->hasLinkage()); 2889 2890 if (isFriend) { 2891 // DC is the namespace in which the function is being declared. 2892 assert((DC->isFileContext() || !Previous.empty()) && 2893 "previously-undeclared friend function being created " 2894 "in a non-namespace context"); 2895 2896 if (FunctionTemplate) { 2897 FunctionTemplate->setObjectOfFriendDecl( 2898 /* PreviouslyDeclared= */ !Previous.empty()); 2899 FunctionTemplate->setAccess(AS_public); 2900 } 2901 else 2902 NewFD->setObjectOfFriendDecl(/* PreviouslyDeclared= */ !Previous.empty()); 2903 2904 NewFD->setAccess(AS_public); 2905 } 2906 2907 if (SC == FunctionDecl::Static && isa<CXXMethodDecl>(NewFD) && 2908 !CurContext->isRecord()) { 2909 // C++ [class.static]p1: 2910 // A data or function member of a class may be declared static 2911 // in a class definition, in which case it is a static member of 2912 // the class. 2913 2914 // Complain about the 'static' specifier if it's on an out-of-line 2915 // member function definition. 2916 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2917 diag::err_static_out_of_line) 2918 << CodeModificationHint::CreateRemoval( 2919 D.getDeclSpec().getStorageClassSpecLoc()); 2920 } 2921 2922 // Handle GNU asm-label extension (encoded as an attribute). 2923 if (Expr *E = (Expr*) D.getAsmLabel()) { 2924 // The parser guarantees this is a string. 2925 StringLiteral *SE = cast<StringLiteral>(E); 2926 NewFD->addAttr(::new (Context) AsmLabelAttr(Context, SE->getString())); 2927 } 2928 2929 // Copy the parameter declarations from the declarator D to the function 2930 // declaration NewFD, if they are available. First scavenge them into Params. 2931 llvm::SmallVector<ParmVarDecl*, 16> Params; 2932 if (D.getNumTypeObjects() > 0) { 2933 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 2934 2935 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 2936 // function that takes no arguments, not a function that takes a 2937 // single void argument. 2938 // We let through "const void" here because Sema::GetTypeForDeclarator 2939 // already checks for that case. 2940 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 2941 FTI.ArgInfo[0].Param && 2942 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()) { 2943 // Empty arg list, don't push any params. 2944 ParmVarDecl *Param = FTI.ArgInfo[0].Param.getAs<ParmVarDecl>(); 2945 2946 // In C++, the empty parameter-type-list must be spelled "void"; a 2947 // typedef of void is not permitted. 2948 if (getLangOptions().CPlusPlus && 2949 Param->getType().getUnqualifiedType() != Context.VoidTy) 2950 Diag(Param->getLocation(), diag::err_param_typedef_of_void); 2951 // FIXME: Leaks decl? 2952 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 2953 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 2954 ParmVarDecl *Param = FTI.ArgInfo[i].Param.getAs<ParmVarDecl>(); 2955 assert(Param->getDeclContext() != NewFD && "Was set before ?"); 2956 Param->setDeclContext(NewFD); 2957 Params.push_back(Param); 2958 } 2959 } 2960 2961 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) { 2962 // When we're declaring a function with a typedef, typeof, etc as in the 2963 // following example, we'll need to synthesize (unnamed) 2964 // parameters for use in the declaration. 2965 // 2966 // @code 2967 // typedef void fn(int); 2968 // fn f; 2969 // @endcode 2970 2971 // Synthesize a parameter for each argument type. 2972 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 2973 AE = FT->arg_type_end(); AI != AE; ++AI) { 2974 ParmVarDecl *Param = ParmVarDecl::Create(Context, NewFD, 2975 SourceLocation(), 0, 2976 *AI, /*TInfo=*/0, 2977 VarDecl::None, 0); 2978 Param->setImplicit(); 2979 Params.push_back(Param); 2980 } 2981 } else { 2982 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && 2983 "Should not need args for typedef of non-prototype fn"); 2984 } 2985 // Finally, we know we have the right number of parameters, install them. 2986 NewFD->setParams(Params.data(), Params.size()); 2987 2988 // If the declarator is a template-id, translate the parser's template 2989 // argument list into our AST format. 2990 bool HasExplicitTemplateArgs = false; 2991 TemplateArgumentListInfo TemplateArgs; 2992 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) { 2993 TemplateIdAnnotation *TemplateId = D.getName().TemplateId; 2994 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc); 2995 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc); 2996 ASTTemplateArgsPtr TemplateArgsPtr(*this, 2997 TemplateId->getTemplateArgs(), 2998 TemplateId->NumArgs); 2999 translateTemplateArguments(TemplateArgsPtr, 3000 TemplateArgs); 3001 TemplateArgsPtr.release(); 3002 3003 HasExplicitTemplateArgs = true; 3004 3005 if (FunctionTemplate) { 3006 // FIXME: Diagnose function template with explicit template 3007 // arguments. 3008 HasExplicitTemplateArgs = false; 3009 } else if (!isFunctionTemplateSpecialization && 3010 !D.getDeclSpec().isFriendSpecified()) { 3011 // We have encountered something that the user meant to be a 3012 // specialization (because it has explicitly-specified template 3013 // arguments) but that was not introduced with a "template<>" (or had 3014 // too few of them). 3015 Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header) 3016 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc) 3017 << CodeModificationHint::CreateInsertion( 3018 D.getDeclSpec().getSourceRange().getBegin(), 3019 "template<> "); 3020 isFunctionTemplateSpecialization = true; 3021 } 3022 } 3023 3024 if (isFunctionTemplateSpecialization) { 3025 if (CheckFunctionTemplateSpecialization(NewFD, 3026 (HasExplicitTemplateArgs ? &TemplateArgs : 0), 3027 Previous)) 3028 NewFD->setInvalidDecl(); 3029 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD) && 3030 CheckMemberSpecialization(NewFD, Previous)) 3031 NewFD->setInvalidDecl(); 3032 3033 // Perform semantic checking on the function declaration. 3034 bool OverloadableAttrRequired = false; // FIXME: HACK! 3035 CheckFunctionDeclaration(S, NewFD, Previous, isExplicitSpecialization, 3036 Redeclaration, /*FIXME:*/OverloadableAttrRequired); 3037 3038 assert((NewFD->isInvalidDecl() || !Redeclaration || 3039 Previous.getResultKind() != LookupResult::FoundOverloaded) && 3040 "previous declaration set still overloaded"); 3041 3042 // If we have a function template, check the template parameter 3043 // list. This will check and merge default template arguments. 3044 if (FunctionTemplate) { 3045 FunctionTemplateDecl *PrevTemplate = FunctionTemplate->getPreviousDeclaration(); 3046 CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(), 3047 PrevTemplate? PrevTemplate->getTemplateParameters() : 0, 3048 D.getDeclSpec().isFriendSpecified()? TPC_FriendFunctionTemplate 3049 : TPC_FunctionTemplate); 3050 } 3051 3052 if (D.getCXXScopeSpec().isSet() && !NewFD->isInvalidDecl()) { 3053 // Fake up an access specifier if it's supposed to be a class member. 3054 if (!Redeclaration && isa<CXXRecordDecl>(NewFD->getDeclContext())) 3055 NewFD->setAccess(AS_public); 3056 3057 // An out-of-line member function declaration must also be a 3058 // definition (C++ [dcl.meaning]p1). 3059 // Note that this is not the case for explicit specializations of 3060 // function templates or member functions of class templates, per 3061 // C++ [temp.expl.spec]p2. 3062 if (!IsFunctionDefinition && !isFriend && 3063 !isFunctionTemplateSpecialization && !isExplicitSpecialization) { 3064 Diag(NewFD->getLocation(), diag::err_out_of_line_declaration) 3065 << D.getCXXScopeSpec().getRange(); 3066 NewFD->setInvalidDecl(); 3067 } else if (!Redeclaration && 3068 !(isFriend && CurContext->isDependentContext())) { 3069 // The user tried to provide an out-of-line definition for a 3070 // function that is a member of a class or namespace, but there 3071 // was no such member function declared (C++ [class.mfct]p2, 3072 // C++ [namespace.memdef]p2). For example: 3073 // 3074 // class X { 3075 // void f() const; 3076 // }; 3077 // 3078 // void X::f() { } // ill-formed 3079 // 3080 // Complain about this problem, and attempt to suggest close 3081 // matches (e.g., those that differ only in cv-qualifiers and 3082 // whether the parameter types are references). 3083 Diag(D.getIdentifierLoc(), diag::err_member_def_does_not_match) 3084 << Name << DC << D.getCXXScopeSpec().getRange(); 3085 NewFD->setInvalidDecl(); 3086 3087 LookupResult Prev(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 3088 ForRedeclaration); 3089 LookupQualifiedName(Prev, DC); 3090 assert(!Prev.isAmbiguous() && 3091 "Cannot have an ambiguity in previous-declaration lookup"); 3092 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 3093 Func != FuncEnd; ++Func) { 3094 if (isa<FunctionDecl>(*Func) && 3095 isNearlyMatchingFunction(Context, cast<FunctionDecl>(*Func), NewFD)) 3096 Diag((*Func)->getLocation(), diag::note_member_def_close_match); 3097 } 3098 } 3099 } 3100 3101 // Handle attributes. We need to have merged decls when handling attributes 3102 // (for example to check for conflicts, etc). 3103 // FIXME: This needs to happen before we merge declarations. Then, 3104 // let attribute merging cope with attribute conflicts. 3105 ProcessDeclAttributes(S, NewFD, D); 3106 3107 // attributes declared post-definition are currently ignored 3108 if (Redeclaration && Previous.isSingleResult()) { 3109 const FunctionDecl *Def; 3110 FunctionDecl *PrevFD = dyn_cast<FunctionDecl>(Previous.getFoundDecl()); 3111 if (PrevFD && PrevFD->getBody(Def) && D.hasAttributes()) { 3112 Diag(NewFD->getLocation(), diag::warn_attribute_precede_definition); 3113 Diag(Def->getLocation(), diag::note_previous_definition); 3114 } 3115 } 3116 3117 AddKnownFunctionAttributes(NewFD); 3118 3119 if (OverloadableAttrRequired && !NewFD->getAttr<OverloadableAttr>()) { 3120 // If a function name is overloadable in C, then every function 3121 // with that name must be marked "overloadable". 3122 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 3123 << Redeclaration << NewFD; 3124 if (!Previous.empty()) 3125 Diag(Previous.getRepresentativeDecl()->getLocation(), 3126 diag::note_attribute_overloadable_prev_overload); 3127 NewFD->addAttr(::new (Context) OverloadableAttr()); 3128 } 3129 3130 // If this is a locally-scoped extern C function, update the 3131 // map of such names. 3132 if (CurContext->isFunctionOrMethod() && NewFD->isExternC() 3133 && !NewFD->isInvalidDecl()) 3134 RegisterLocallyScopedExternCDecl(NewFD, Previous, S); 3135 3136 // Set this FunctionDecl's range up to the right paren. 3137 NewFD->setLocEnd(D.getSourceRange().getEnd()); 3138 3139 if (FunctionTemplate && NewFD->isInvalidDecl()) 3140 FunctionTemplate->setInvalidDecl(); 3141 3142 if (FunctionTemplate) 3143 return FunctionTemplate; 3144 3145 3146 // Keep track of static, non-inlined function definitions that 3147 // have not been used. We will warn later. 3148 // FIXME: Also include static functions declared but not defined. 3149 if (!NewFD->isInvalidDecl() && IsFunctionDefinition 3150 && !NewFD->isInlined() && NewFD->getLinkage() == InternalLinkage 3151 && !NewFD->isUsed() && !NewFD->hasAttr<UnusedAttr>()) 3152 UnusedStaticFuncs.push_back(NewFD); 3153 3154 return NewFD; 3155} 3156 3157/// \brief Perform semantic checking of a new function declaration. 3158/// 3159/// Performs semantic analysis of the new function declaration 3160/// NewFD. This routine performs all semantic checking that does not 3161/// require the actual declarator involved in the declaration, and is 3162/// used both for the declaration of functions as they are parsed 3163/// (called via ActOnDeclarator) and for the declaration of functions 3164/// that have been instantiated via C++ template instantiation (called 3165/// via InstantiateDecl). 3166/// 3167/// \param IsExplicitSpecialiation whether this new function declaration is 3168/// an explicit specialization of the previous declaration. 3169/// 3170/// This sets NewFD->isInvalidDecl() to true if there was an error. 3171void Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD, 3172 LookupResult &Previous, 3173 bool IsExplicitSpecialization, 3174 bool &Redeclaration, 3175 bool &OverloadableAttrRequired) { 3176 // If NewFD is already known erroneous, don't do any of this checking. 3177 if (NewFD->isInvalidDecl()) 3178 return; 3179 3180 if (NewFD->getResultType()->isVariablyModifiedType()) { 3181 // Functions returning a variably modified type violate C99 6.7.5.2p2 3182 // because all functions have linkage. 3183 Diag(NewFD->getLocation(), diag::err_vm_func_decl); 3184 return NewFD->setInvalidDecl(); 3185 } 3186 3187 if (NewFD->isMain()) 3188 CheckMain(NewFD); 3189 3190 // Check for a previous declaration of this name. 3191 if (Previous.empty() && NewFD->isExternC()) { 3192 // Since we did not find anything by this name and we're declaring 3193 // an extern "C" function, look for a non-visible extern "C" 3194 // declaration with the same name. 3195 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3196 = LocallyScopedExternalDecls.find(NewFD->getDeclName()); 3197 if (Pos != LocallyScopedExternalDecls.end()) 3198 Previous.addDecl(Pos->second); 3199 } 3200 3201 // Merge or overload the declaration with an existing declaration of 3202 // the same name, if appropriate. 3203 if (!Previous.empty()) { 3204 // Determine whether NewFD is an overload of PrevDecl or 3205 // a declaration that requires merging. If it's an overload, 3206 // there's no more work to do here; we'll just add the new 3207 // function to the scope. 3208 3209 NamedDecl *OldDecl = 0; 3210 if (!AllowOverloadingOfFunction(Previous, Context)) { 3211 Redeclaration = true; 3212 OldDecl = Previous.getFoundDecl(); 3213 } else { 3214 if (!getLangOptions().CPlusPlus) { 3215 OverloadableAttrRequired = true; 3216 3217 // Functions marked "overloadable" must have a prototype (that 3218 // we can't get through declaration merging). 3219 if (!NewFD->getType()->getAs<FunctionProtoType>()) { 3220 Diag(NewFD->getLocation(), 3221 diag::err_attribute_overloadable_no_prototype) 3222 << NewFD; 3223 Redeclaration = true; 3224 3225 // Turn this into a variadic function with no parameters. 3226 QualType R = Context.getFunctionType( 3227 NewFD->getType()->getAs<FunctionType>()->getResultType(), 3228 0, 0, true, 0); 3229 NewFD->setType(R); 3230 return NewFD->setInvalidDecl(); 3231 } 3232 } 3233 3234 switch (CheckOverload(NewFD, Previous, OldDecl)) { 3235 case Ovl_Match: 3236 Redeclaration = true; 3237 if (isa<UsingShadowDecl>(OldDecl) && CurContext->isRecord()) { 3238 HideUsingShadowDecl(S, cast<UsingShadowDecl>(OldDecl)); 3239 Redeclaration = false; 3240 } 3241 break; 3242 3243 case Ovl_NonFunction: 3244 Redeclaration = true; 3245 break; 3246 3247 case Ovl_Overload: 3248 Redeclaration = false; 3249 break; 3250 } 3251 } 3252 3253 if (Redeclaration) { 3254 // NewFD and OldDecl represent declarations that need to be 3255 // merged. 3256 if (MergeFunctionDecl(NewFD, OldDecl)) 3257 return NewFD->setInvalidDecl(); 3258 3259 Previous.clear(); 3260 Previous.addDecl(OldDecl); 3261 3262 if (FunctionTemplateDecl *OldTemplateDecl 3263 = dyn_cast<FunctionTemplateDecl>(OldDecl)) { 3264 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl()); 3265 FunctionTemplateDecl *NewTemplateDecl 3266 = NewFD->getDescribedFunctionTemplate(); 3267 assert(NewTemplateDecl && "Template/non-template mismatch"); 3268 if (CXXMethodDecl *Method 3269 = dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) { 3270 Method->setAccess(OldTemplateDecl->getAccess()); 3271 NewTemplateDecl->setAccess(OldTemplateDecl->getAccess()); 3272 } 3273 3274 // If this is an explicit specialization of a member that is a function 3275 // template, mark it as a member specialization. 3276 if (IsExplicitSpecialization && 3277 NewTemplateDecl->getInstantiatedFromMemberTemplate()) { 3278 NewTemplateDecl->setMemberSpecialization(); 3279 assert(OldTemplateDecl->isMemberSpecialization()); 3280 } 3281 } else { 3282 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions 3283 NewFD->setAccess(OldDecl->getAccess()); 3284 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 3285 } 3286 } 3287 } 3288 3289 // Semantic checking for this function declaration (in isolation). 3290 if (getLangOptions().CPlusPlus) { 3291 // C++-specific checks. 3292 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { 3293 CheckConstructor(Constructor); 3294 } else if (CXXDestructorDecl *Destructor = 3295 dyn_cast<CXXDestructorDecl>(NewFD)) { 3296 CXXRecordDecl *Record = Destructor->getParent(); 3297 QualType ClassType = Context.getTypeDeclType(Record); 3298 3299 // FIXME: Shouldn't we be able to perform thisc heck even when the class 3300 // type is dependent? Both gcc and edg can handle that. 3301 if (!ClassType->isDependentType()) { 3302 DeclarationName Name 3303 = Context.DeclarationNames.getCXXDestructorName( 3304 Context.getCanonicalType(ClassType)); 3305 if (NewFD->getDeclName() != Name) { 3306 Diag(NewFD->getLocation(), diag::err_destructor_name); 3307 return NewFD->setInvalidDecl(); 3308 } 3309 } 3310 3311 Record->setUserDeclaredDestructor(true); 3312 // C++ [class]p4: A POD-struct is an aggregate class that has [...] no 3313 // user-defined destructor. 3314 Record->setPOD(false); 3315 3316 // C++ [class.dtor]p3: A destructor is trivial if it is an implicitly- 3317 // declared destructor. 3318 // FIXME: C++0x: don't do this for "= default" destructors 3319 Record->setHasTrivialDestructor(false); 3320 } else if (CXXConversionDecl *Conversion 3321 = dyn_cast<CXXConversionDecl>(NewFD)) { 3322 ActOnConversionDeclarator(Conversion); 3323 } 3324 3325 // Find any virtual functions that this function overrides. 3326 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) { 3327 if (!Method->isFunctionTemplateSpecialization() && 3328 !Method->getDescribedFunctionTemplate()) 3329 AddOverriddenMethods(Method->getParent(), Method); 3330 } 3331 3332 // Additional checks for the destructor; make sure we do this after we 3333 // figure out whether the destructor is virtual. 3334 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(NewFD)) 3335 if (!Destructor->getParent()->isDependentType()) 3336 CheckDestructor(Destructor); 3337 3338 // Extra checking for C++ overloaded operators (C++ [over.oper]). 3339 if (NewFD->isOverloadedOperator() && 3340 CheckOverloadedOperatorDeclaration(NewFD)) 3341 return NewFD->setInvalidDecl(); 3342 3343 // Extra checking for C++0x literal operators (C++0x [over.literal]). 3344 if (NewFD->getLiteralIdentifier() && 3345 CheckLiteralOperatorDeclaration(NewFD)) 3346 return NewFD->setInvalidDecl(); 3347 3348 // In C++, check default arguments now that we have merged decls. Unless 3349 // the lexical context is the class, because in this case this is done 3350 // during delayed parsing anyway. 3351 if (!CurContext->isRecord()) 3352 CheckCXXDefaultArguments(NewFD); 3353 } 3354} 3355 3356void Sema::CheckMain(FunctionDecl* FD) { 3357 // C++ [basic.start.main]p3: A program that declares main to be inline 3358 // or static is ill-formed. 3359 // C99 6.7.4p4: In a hosted environment, the inline function specifier 3360 // shall not appear in a declaration of main. 3361 // static main is not an error under C99, but we should warn about it. 3362 bool isInline = FD->isInlineSpecified(); 3363 bool isStatic = FD->getStorageClass() == FunctionDecl::Static; 3364 if (isInline || isStatic) { 3365 unsigned diagID = diag::warn_unusual_main_decl; 3366 if (isInline || getLangOptions().CPlusPlus) 3367 diagID = diag::err_unusual_main_decl; 3368 3369 int which = isStatic + (isInline << 1) - 1; 3370 Diag(FD->getLocation(), diagID) << which; 3371 } 3372 3373 QualType T = FD->getType(); 3374 assert(T->isFunctionType() && "function decl is not of function type"); 3375 const FunctionType* FT = T->getAs<FunctionType>(); 3376 3377 if (!Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) { 3378 // TODO: add a replacement fixit to turn the return type into 'int'. 3379 Diag(FD->getTypeSpecStartLoc(), diag::err_main_returns_nonint); 3380 FD->setInvalidDecl(true); 3381 } 3382 3383 // Treat protoless main() as nullary. 3384 if (isa<FunctionNoProtoType>(FT)) return; 3385 3386 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT); 3387 unsigned nparams = FTP->getNumArgs(); 3388 assert(FD->getNumParams() == nparams); 3389 3390 bool HasExtraParameters = (nparams > 3); 3391 3392 // Darwin passes an undocumented fourth argument of type char**. If 3393 // other platforms start sprouting these, the logic below will start 3394 // getting shifty. 3395 if (nparams == 4 && 3396 Context.Target.getTriple().getOS() == llvm::Triple::Darwin) 3397 HasExtraParameters = false; 3398 3399 if (HasExtraParameters) { 3400 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams; 3401 FD->setInvalidDecl(true); 3402 nparams = 3; 3403 } 3404 3405 // FIXME: a lot of the following diagnostics would be improved 3406 // if we had some location information about types. 3407 3408 QualType CharPP = 3409 Context.getPointerType(Context.getPointerType(Context.CharTy)); 3410 QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP }; 3411 3412 for (unsigned i = 0; i < nparams; ++i) { 3413 QualType AT = FTP->getArgType(i); 3414 3415 bool mismatch = true; 3416 3417 if (Context.hasSameUnqualifiedType(AT, Expected[i])) 3418 mismatch = false; 3419 else if (Expected[i] == CharPP) { 3420 // As an extension, the following forms are okay: 3421 // char const ** 3422 // char const * const * 3423 // char * const * 3424 3425 QualifierCollector qs; 3426 const PointerType* PT; 3427 if ((PT = qs.strip(AT)->getAs<PointerType>()) && 3428 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) && 3429 (QualType(qs.strip(PT->getPointeeType()), 0) == Context.CharTy)) { 3430 qs.removeConst(); 3431 mismatch = !qs.empty(); 3432 } 3433 } 3434 3435 if (mismatch) { 3436 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i]; 3437 // TODO: suggest replacing given type with expected type 3438 FD->setInvalidDecl(true); 3439 } 3440 } 3441 3442 if (nparams == 1 && !FD->isInvalidDecl()) { 3443 Diag(FD->getLocation(), diag::warn_main_one_arg); 3444 } 3445} 3446 3447bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 3448 // FIXME: Need strict checking. In C89, we need to check for 3449 // any assignment, increment, decrement, function-calls, or 3450 // commas outside of a sizeof. In C99, it's the same list, 3451 // except that the aforementioned are allowed in unevaluated 3452 // expressions. Everything else falls under the 3453 // "may accept other forms of constant expressions" exception. 3454 // (We never end up here for C++, so the constant expression 3455 // rules there don't matter.) 3456 if (Init->isConstantInitializer(Context)) 3457 return false; 3458 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 3459 << Init->getSourceRange(); 3460 return true; 3461} 3462 3463void Sema::AddInitializerToDecl(DeclPtrTy dcl, ExprArg init) { 3464 AddInitializerToDecl(dcl, move(init), /*DirectInit=*/false); 3465} 3466 3467/// AddInitializerToDecl - Adds the initializer Init to the 3468/// declaration dcl. If DirectInit is true, this is C++ direct 3469/// initialization rather than copy initialization. 3470void Sema::AddInitializerToDecl(DeclPtrTy dcl, ExprArg init, bool DirectInit) { 3471 Decl *RealDecl = dcl.getAs<Decl>(); 3472 // If there is no declaration, there was an error parsing it. Just ignore 3473 // the initializer. 3474 if (RealDecl == 0) 3475 return; 3476 3477 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 3478 // With declarators parsed the way they are, the parser cannot 3479 // distinguish between a normal initializer and a pure-specifier. 3480 // Thus this grotesque test. 3481 IntegerLiteral *IL; 3482 Expr *Init = static_cast<Expr *>(init.get()); 3483 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 3484 Context.getCanonicalType(IL->getType()) == Context.IntTy) 3485 CheckPureMethod(Method, Init->getSourceRange()); 3486 else { 3487 Diag(Method->getLocation(), diag::err_member_function_initialization) 3488 << Method->getDeclName() << Init->getSourceRange(); 3489 Method->setInvalidDecl(); 3490 } 3491 return; 3492 } 3493 3494 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 3495 if (!VDecl) { 3496 if (getLangOptions().CPlusPlus && 3497 RealDecl->getLexicalDeclContext()->isRecord() && 3498 isa<NamedDecl>(RealDecl)) 3499 Diag(RealDecl->getLocation(), diag::err_member_initialization) 3500 << cast<NamedDecl>(RealDecl)->getDeclName(); 3501 else 3502 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 3503 RealDecl->setInvalidDecl(); 3504 return; 3505 } 3506 3507 // A definition must end up with a complete type, which means it must be 3508 // complete with the restriction that an array type might be completed by the 3509 // initializer; note that later code assumes this restriction. 3510 QualType BaseDeclType = VDecl->getType(); 3511 if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType)) 3512 BaseDeclType = Array->getElementType(); 3513 if (RequireCompleteType(VDecl->getLocation(), BaseDeclType, 3514 diag::err_typecheck_decl_incomplete_type)) { 3515 RealDecl->setInvalidDecl(); 3516 return; 3517 } 3518 3519 // The variable can not have an abstract class type. 3520 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 3521 diag::err_abstract_type_in_decl, 3522 AbstractVariableType)) 3523 VDecl->setInvalidDecl(); 3524 3525 const VarDecl *Def; 3526 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 3527 Diag(VDecl->getLocation(), diag::err_redefinition) 3528 << VDecl->getDeclName(); 3529 Diag(Def->getLocation(), diag::note_previous_definition); 3530 VDecl->setInvalidDecl(); 3531 return; 3532 } 3533 3534 // Take ownership of the expression, now that we're sure we have somewhere 3535 // to put it. 3536 Expr *Init = init.takeAs<Expr>(); 3537 assert(Init && "missing initializer"); 3538 3539 // Capture the variable that is being initialized and the style of 3540 // initialization. 3541 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 3542 3543 // FIXME: Poor source location information. 3544 InitializationKind Kind 3545 = DirectInit? InitializationKind::CreateDirect(VDecl->getLocation(), 3546 Init->getLocStart(), 3547 Init->getLocEnd()) 3548 : InitializationKind::CreateCopy(VDecl->getLocation(), 3549 Init->getLocStart()); 3550 3551 // Get the decls type and save a reference for later, since 3552 // CheckInitializerTypes may change it. 3553 QualType DclT = VDecl->getType(), SavT = DclT; 3554 if (VDecl->isBlockVarDecl()) { 3555 if (VDecl->hasExternalStorage()) { // C99 6.7.8p5 3556 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 3557 VDecl->setInvalidDecl(); 3558 } else if (!VDecl->isInvalidDecl()) { 3559 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 3560 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 3561 MultiExprArg(*this, (void**)&Init, 1), 3562 &DclT); 3563 if (Result.isInvalid()) { 3564 VDecl->setInvalidDecl(); 3565 return; 3566 } 3567 3568 Init = Result.takeAs<Expr>(); 3569 3570 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 3571 // Don't check invalid declarations to avoid emitting useless diagnostics. 3572 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 3573 if (VDecl->getStorageClass() == VarDecl::Static) // C99 6.7.8p4. 3574 CheckForConstantInitializer(Init, DclT); 3575 } 3576 } 3577 } else if (VDecl->isStaticDataMember() && 3578 VDecl->getLexicalDeclContext()->isRecord()) { 3579 // This is an in-class initialization for a static data member, e.g., 3580 // 3581 // struct S { 3582 // static const int value = 17; 3583 // }; 3584 3585 // Attach the initializer 3586 VDecl->setInit(Init); 3587 3588 // C++ [class.mem]p4: 3589 // A member-declarator can contain a constant-initializer only 3590 // if it declares a static member (9.4) of const integral or 3591 // const enumeration type, see 9.4.2. 3592 QualType T = VDecl->getType(); 3593 if (!T->isDependentType() && 3594 (!Context.getCanonicalType(T).isConstQualified() || 3595 !T->isIntegralType())) { 3596 Diag(VDecl->getLocation(), diag::err_member_initialization) 3597 << VDecl->getDeclName() << Init->getSourceRange(); 3598 VDecl->setInvalidDecl(); 3599 } else { 3600 // C++ [class.static.data]p4: 3601 // If a static data member is of const integral or const 3602 // enumeration type, its declaration in the class definition 3603 // can specify a constant-initializer which shall be an 3604 // integral constant expression (5.19). 3605 if (!Init->isTypeDependent() && 3606 !Init->getType()->isIntegralType()) { 3607 // We have a non-dependent, non-integral or enumeration type. 3608 Diag(Init->getSourceRange().getBegin(), 3609 diag::err_in_class_initializer_non_integral_type) 3610 << Init->getType() << Init->getSourceRange(); 3611 VDecl->setInvalidDecl(); 3612 } else if (!Init->isTypeDependent() && !Init->isValueDependent()) { 3613 // Check whether the expression is a constant expression. 3614 llvm::APSInt Value; 3615 SourceLocation Loc; 3616 if (!Init->isIntegerConstantExpr(Value, Context, &Loc)) { 3617 Diag(Loc, diag::err_in_class_initializer_non_constant) 3618 << Init->getSourceRange(); 3619 VDecl->setInvalidDecl(); 3620 } else if (!VDecl->getType()->isDependentType()) 3621 ImpCastExprToType(Init, VDecl->getType(), CastExpr::CK_IntegralCast); 3622 } 3623 } 3624 } else if (VDecl->isFileVarDecl()) { 3625 if (VDecl->getStorageClass() == VarDecl::Extern) 3626 Diag(VDecl->getLocation(), diag::warn_extern_init); 3627 if (!VDecl->isInvalidDecl()) { 3628 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 3629 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 3630 MultiExprArg(*this, (void**)&Init, 1), 3631 &DclT); 3632 if (Result.isInvalid()) { 3633 VDecl->setInvalidDecl(); 3634 return; 3635 } 3636 3637 Init = Result.takeAs<Expr>(); 3638 } 3639 3640 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 3641 // Don't check invalid declarations to avoid emitting useless diagnostics. 3642 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 3643 // C99 6.7.8p4. All file scoped initializers need to be constant. 3644 CheckForConstantInitializer(Init, DclT); 3645 } 3646 } 3647 // If the type changed, it means we had an incomplete type that was 3648 // completed by the initializer. For example: 3649 // int ary[] = { 1, 3, 5 }; 3650 // "ary" transitions from a VariableArrayType to a ConstantArrayType. 3651 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 3652 VDecl->setType(DclT); 3653 Init->setType(DclT); 3654 } 3655 3656 Init = MaybeCreateCXXExprWithTemporaries(Init); 3657 // Attach the initializer to the decl. 3658 VDecl->setInit(Init); 3659 3660 if (getLangOptions().CPlusPlus) { 3661 // Make sure we mark the destructor as used if necessary. 3662 QualType InitType = VDecl->getType(); 3663 while (const ArrayType *Array = Context.getAsArrayType(InitType)) 3664 InitType = Context.getBaseElementType(Array); 3665 if (const RecordType *Record = InitType->getAs<RecordType>()) 3666 FinalizeVarWithDestructor(VDecl, Record); 3667 } 3668 3669 return; 3670} 3671 3672void Sema::ActOnUninitializedDecl(DeclPtrTy dcl, 3673 bool TypeContainsUndeducedAuto) { 3674 Decl *RealDecl = dcl.getAs<Decl>(); 3675 3676 // If there is no declaration, there was an error parsing it. Just ignore it. 3677 if (RealDecl == 0) 3678 return; 3679 3680 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 3681 QualType Type = Var->getType(); 3682 3683 // C++0x [dcl.spec.auto]p3 3684 if (TypeContainsUndeducedAuto) { 3685 Diag(Var->getLocation(), diag::err_auto_var_requires_init) 3686 << Var->getDeclName() << Type; 3687 Var->setInvalidDecl(); 3688 return; 3689 } 3690 3691 switch (Var->isThisDeclarationADefinition()) { 3692 case VarDecl::Definition: 3693 if (!Var->isStaticDataMember() || !Var->getAnyInitializer()) 3694 break; 3695 3696 // We have an out-of-line definition of a static data member 3697 // that has an in-class initializer, so we type-check this like 3698 // a declaration. 3699 // 3700 // Fall through 3701 3702 case VarDecl::DeclarationOnly: 3703 // It's only a declaration. 3704 3705 // Block scope. C99 6.7p7: If an identifier for an object is 3706 // declared with no linkage (C99 6.2.2p6), the type for the 3707 // object shall be complete. 3708 if (!Type->isDependentType() && Var->isBlockVarDecl() && 3709 !Var->getLinkage() && !Var->isInvalidDecl() && 3710 RequireCompleteType(Var->getLocation(), Type, 3711 diag::err_typecheck_decl_incomplete_type)) 3712 Var->setInvalidDecl(); 3713 3714 // Make sure that the type is not abstract. 3715 if (!Type->isDependentType() && !Var->isInvalidDecl() && 3716 RequireNonAbstractType(Var->getLocation(), Type, 3717 diag::err_abstract_type_in_decl, 3718 AbstractVariableType)) 3719 Var->setInvalidDecl(); 3720 return; 3721 3722 case VarDecl::TentativeDefinition: 3723 // File scope. C99 6.9.2p2: A declaration of an identifier for an 3724 // object that has file scope without an initializer, and without a 3725 // storage-class specifier or with the storage-class specifier "static", 3726 // constitutes a tentative definition. Note: A tentative definition with 3727 // external linkage is valid (C99 6.2.2p5). 3728 if (!Var->isInvalidDecl()) { 3729 if (const IncompleteArrayType *ArrayT 3730 = Context.getAsIncompleteArrayType(Type)) { 3731 if (RequireCompleteType(Var->getLocation(), 3732 ArrayT->getElementType(), 3733 diag::err_illegal_decl_array_incomplete_type)) 3734 Var->setInvalidDecl(); 3735 } else if (Var->getStorageClass() == VarDecl::Static) { 3736 // C99 6.9.2p3: If the declaration of an identifier for an object is 3737 // a tentative definition and has internal linkage (C99 6.2.2p3), the 3738 // declared type shall not be an incomplete type. 3739 // NOTE: code such as the following 3740 // static struct s; 3741 // struct s { int a; }; 3742 // is accepted by gcc. Hence here we issue a warning instead of 3743 // an error and we do not invalidate the static declaration. 3744 // NOTE: to avoid multiple warnings, only check the first declaration. 3745 if (Var->getPreviousDeclaration() == 0) 3746 RequireCompleteType(Var->getLocation(), Type, 3747 diag::ext_typecheck_decl_incomplete_type); 3748 } 3749 } 3750 3751 // Record the tentative definition; we're done. 3752 if (!Var->isInvalidDecl()) 3753 TentativeDefinitions.push_back(Var); 3754 return; 3755 } 3756 3757 // Provide a specific diagnostic for uninitialized variable 3758 // definitions with incomplete array type. 3759 if (Type->isIncompleteArrayType()) { 3760 Diag(Var->getLocation(), 3761 diag::err_typecheck_incomplete_array_needs_initializer); 3762 Var->setInvalidDecl(); 3763 return; 3764 } 3765 3766 // Provide a specific diagnostic for uninitialized variable 3767 // definitions with reference type. 3768 if (Type->isReferenceType()) { 3769 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 3770 << Var->getDeclName() 3771 << SourceRange(Var->getLocation(), Var->getLocation()); 3772 Var->setInvalidDecl(); 3773 return; 3774 } 3775 3776 // Do not attempt to type-check the default initializer for a 3777 // variable with dependent type. 3778 if (Type->isDependentType()) 3779 return; 3780 3781 if (Var->isInvalidDecl()) 3782 return; 3783 3784 if (RequireCompleteType(Var->getLocation(), 3785 Context.getBaseElementType(Type), 3786 diag::err_typecheck_decl_incomplete_type)) { 3787 Var->setInvalidDecl(); 3788 return; 3789 } 3790 3791 // The variable can not have an abstract class type. 3792 if (RequireNonAbstractType(Var->getLocation(), Type, 3793 diag::err_abstract_type_in_decl, 3794 AbstractVariableType)) { 3795 Var->setInvalidDecl(); 3796 return; 3797 } 3798 3799 InitializedEntity Entity = InitializedEntity::InitializeVariable(Var); 3800 InitializationKind Kind 3801 = InitializationKind::CreateDefault(Var->getLocation()); 3802 3803 InitializationSequence InitSeq(*this, Entity, Kind, 0, 0); 3804 OwningExprResult Init = InitSeq.Perform(*this, Entity, Kind, 3805 MultiExprArg(*this, 0, 0)); 3806 if (Init.isInvalid()) 3807 Var->setInvalidDecl(); 3808 else { 3809 if (Init.get()) 3810 Var->setInit(MaybeCreateCXXExprWithTemporaries(Init.takeAs<Expr>())); 3811 3812 if (getLangOptions().CPlusPlus) 3813 if (const RecordType *Record 3814 = Context.getBaseElementType(Type)->getAs<RecordType>()) 3815 FinalizeVarWithDestructor(Var, Record); 3816 } 3817 } 3818} 3819 3820Sema::DeclGroupPtrTy Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, 3821 DeclPtrTy *Group, 3822 unsigned NumDecls) { 3823 llvm::SmallVector<Decl*, 8> Decls; 3824 3825 if (DS.isTypeSpecOwned()) 3826 Decls.push_back((Decl*)DS.getTypeRep()); 3827 3828 for (unsigned i = 0; i != NumDecls; ++i) 3829 if (Decl *D = Group[i].getAs<Decl>()) 3830 Decls.push_back(D); 3831 3832 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, 3833 Decls.data(), Decls.size())); 3834} 3835 3836 3837/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 3838/// to introduce parameters into function prototype scope. 3839Sema::DeclPtrTy 3840Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 3841 const DeclSpec &DS = D.getDeclSpec(); 3842 3843 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 3844 VarDecl::StorageClass StorageClass = VarDecl::None; 3845 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 3846 StorageClass = VarDecl::Register; 3847 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 3848 Diag(DS.getStorageClassSpecLoc(), 3849 diag::err_invalid_storage_class_in_func_decl); 3850 D.getMutableDeclSpec().ClearStorageClassSpecs(); 3851 } 3852 3853 if (D.getDeclSpec().isThreadSpecified()) 3854 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 3855 3856 DiagnoseFunctionSpecifiers(D); 3857 3858 // Check that there are no default arguments inside the type of this 3859 // parameter (C++ only). 3860 if (getLangOptions().CPlusPlus) 3861 CheckExtraCXXDefaultArguments(D); 3862 3863 TypeSourceInfo *TInfo = 0; 3864 TagDecl *OwnedDecl = 0; 3865 QualType parmDeclType = GetTypeForDeclarator(D, S, &TInfo, &OwnedDecl); 3866 3867 if (getLangOptions().CPlusPlus && OwnedDecl && OwnedDecl->isDefinition()) { 3868 // C++ [dcl.fct]p6: 3869 // Types shall not be defined in return or parameter types. 3870 Diag(OwnedDecl->getLocation(), diag::err_type_defined_in_param_type) 3871 << Context.getTypeDeclType(OwnedDecl); 3872 } 3873 3874 // TODO: CHECK FOR CONFLICTS, multiple decls with same name in one scope. 3875 // Can this happen for params? We already checked that they don't conflict 3876 // among each other. Here they can only shadow globals, which is ok. 3877 IdentifierInfo *II = D.getIdentifier(); 3878 if (II) { 3879 if (NamedDecl *PrevDecl = LookupSingleName(S, II, LookupOrdinaryName)) { 3880 if (PrevDecl->isTemplateParameter()) { 3881 // Maybe we will complain about the shadowed template parameter. 3882 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 3883 // Just pretend that we didn't see the previous declaration. 3884 PrevDecl = 0; 3885 } else if (S->isDeclScope(DeclPtrTy::make(PrevDecl))) { 3886 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 3887 3888 // Recover by removing the name 3889 II = 0; 3890 D.SetIdentifier(0, D.getIdentifierLoc()); 3891 D.setInvalidType(true); 3892 } 3893 } 3894 } 3895 3896 // Parameters can not be abstract class types. 3897 // For record types, this is done by the AbstractClassUsageDiagnoser once 3898 // the class has been completely parsed. 3899 if (!CurContext->isRecord() && 3900 RequireNonAbstractType(D.getIdentifierLoc(), parmDeclType, 3901 diag::err_abstract_type_in_decl, 3902 AbstractParamType)) 3903 D.setInvalidType(true); 3904 3905 QualType T = adjustParameterType(parmDeclType); 3906 3907 // Temporarily put parameter variables in the translation unit, not 3908 // the enclosing context. This prevents them from accidentally 3909 // looking like class members in C++. 3910 DeclContext *DC = Context.getTranslationUnitDecl(); 3911 3912 ParmVarDecl *New 3913 = ParmVarDecl::Create(Context, DC, D.getIdentifierLoc(), II, 3914 T, TInfo, StorageClass, 0); 3915 3916 if (D.isInvalidType()) 3917 New->setInvalidDecl(); 3918 3919 // Parameter declarators cannot be interface types. All ObjC objects are 3920 // passed by reference. 3921 if (T->isObjCInterfaceType()) { 3922 Diag(D.getIdentifierLoc(), 3923 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T; 3924 New->setInvalidDecl(); 3925 } 3926 3927 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 3928 if (D.getCXXScopeSpec().isSet()) { 3929 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 3930 << D.getCXXScopeSpec().getRange(); 3931 New->setInvalidDecl(); 3932 } 3933 3934 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage 3935 // duration shall not be qualified by an address-space qualifier." 3936 // Since all parameters have automatic store duration, they can not have 3937 // an address space. 3938 if (T.getAddressSpace() != 0) { 3939 Diag(D.getIdentifierLoc(), 3940 diag::err_arg_with_address_space); 3941 New->setInvalidDecl(); 3942 } 3943 3944 3945 // Add the parameter declaration into this scope. 3946 S->AddDecl(DeclPtrTy::make(New)); 3947 if (II) 3948 IdResolver.AddDecl(New); 3949 3950 ProcessDeclAttributes(S, New, D); 3951 3952 if (New->hasAttr<BlocksAttr>()) { 3953 Diag(New->getLocation(), diag::err_block_on_nonlocal); 3954 } 3955 return DeclPtrTy::make(New); 3956} 3957 3958void Sema::ActOnObjCCatchParam(DeclPtrTy D) { 3959 ParmVarDecl *Param = cast<ParmVarDecl>(D.getAs<Decl>()); 3960 Param->setDeclContext(CurContext); 3961} 3962 3963void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 3964 SourceLocation LocAfterDecls) { 3965 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 3966 "Not a function declarator!"); 3967 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 3968 3969 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 3970 // for a K&R function. 3971 if (!FTI.hasPrototype) { 3972 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 3973 --i; 3974 if (FTI.ArgInfo[i].Param == 0) { 3975 llvm::SmallString<256> Code; 3976 llvm::raw_svector_ostream(Code) << " int " 3977 << FTI.ArgInfo[i].Ident->getName() 3978 << ";\n"; 3979 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 3980 << FTI.ArgInfo[i].Ident 3981 << CodeModificationHint::CreateInsertion(LocAfterDecls, Code.str()); 3982 3983 // Implicitly declare the argument as type 'int' for lack of a better 3984 // type. 3985 DeclSpec DS; 3986 const char* PrevSpec; // unused 3987 unsigned DiagID; // unused 3988 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 3989 PrevSpec, DiagID); 3990 Declarator ParamD(DS, Declarator::KNRTypeListContext); 3991 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 3992 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 3993 } 3994 } 3995 } 3996} 3997 3998Sema::DeclPtrTy Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, 3999 Declarator &D) { 4000 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 4001 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 4002 "Not a function declarator!"); 4003 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 4004 4005 if (FTI.hasPrototype) { 4006 // FIXME: Diagnose arguments without names in C. 4007 } 4008 4009 Scope *ParentScope = FnBodyScope->getParent(); 4010 4011 DeclPtrTy DP = HandleDeclarator(ParentScope, D, 4012 MultiTemplateParamsArg(*this), 4013 /*IsFunctionDefinition=*/true); 4014 return ActOnStartOfFunctionDef(FnBodyScope, DP); 4015} 4016 4017static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD) { 4018 // Don't warn about invalid declarations. 4019 if (FD->isInvalidDecl()) 4020 return false; 4021 4022 // Or declarations that aren't global. 4023 if (!FD->isGlobal()) 4024 return false; 4025 4026 // Don't warn about C++ member functions. 4027 if (isa<CXXMethodDecl>(FD)) 4028 return false; 4029 4030 // Don't warn about 'main'. 4031 if (FD->isMain()) 4032 return false; 4033 4034 // Don't warn about inline functions. 4035 if (FD->isInlineSpecified()) 4036 return false; 4037 4038 // Don't warn about function templates. 4039 if (FD->getDescribedFunctionTemplate()) 4040 return false; 4041 4042 // Don't warn about function template specializations. 4043 if (FD->isFunctionTemplateSpecialization()) 4044 return false; 4045 4046 bool MissingPrototype = true; 4047 for (const FunctionDecl *Prev = FD->getPreviousDeclaration(); 4048 Prev; Prev = Prev->getPreviousDeclaration()) { 4049 // Ignore any declarations that occur in function or method 4050 // scope, because they aren't visible from the header. 4051 if (Prev->getDeclContext()->isFunctionOrMethod()) 4052 continue; 4053 4054 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 4055 break; 4056 } 4057 4058 return MissingPrototype; 4059} 4060 4061Sema::DeclPtrTy Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, DeclPtrTy D) { 4062 // Clear the last template instantiation error context. 4063 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation(); 4064 4065 if (!D) 4066 return D; 4067 FunctionDecl *FD = 0; 4068 4069 if (FunctionTemplateDecl *FunTmpl 4070 = dyn_cast<FunctionTemplateDecl>(D.getAs<Decl>())) 4071 FD = FunTmpl->getTemplatedDecl(); 4072 else 4073 FD = cast<FunctionDecl>(D.getAs<Decl>()); 4074 4075 CurFunctionNeedsScopeChecking = false; 4076 4077 // See if this is a redefinition. 4078 // But don't complain if we're in GNU89 mode and the previous definition 4079 // was an extern inline function. 4080 const FunctionDecl *Definition; 4081 if (FD->getBody(Definition) && 4082 !canRedefineFunction(Definition, getLangOptions())) { 4083 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 4084 Diag(Definition->getLocation(), diag::note_previous_definition); 4085 } 4086 4087 // Builtin functions cannot be defined. 4088 if (unsigned BuiltinID = FD->getBuiltinID()) { 4089 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 4090 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 4091 FD->setInvalidDecl(); 4092 } 4093 } 4094 4095 // The return type of a function definition must be complete 4096 // (C99 6.9.1p3, C++ [dcl.fct]p6). 4097 QualType ResultType = FD->getResultType(); 4098 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 4099 !FD->isInvalidDecl() && 4100 RequireCompleteType(FD->getLocation(), ResultType, 4101 diag::err_func_def_incomplete_result)) 4102 FD->setInvalidDecl(); 4103 4104 // GNU warning -Wmissing-prototypes: 4105 // Warn if a global function is defined without a previous 4106 // prototype declaration. This warning is issued even if the 4107 // definition itself provides a prototype. The aim is to detect 4108 // global functions that fail to be declared in header files. 4109 if (ShouldWarnAboutMissingPrototype(FD)) 4110 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 4111 4112 if (FnBodyScope) 4113 PushDeclContext(FnBodyScope, FD); 4114 4115 // Check the validity of our function parameters 4116 CheckParmsForFunctionDef(FD); 4117 4118 // Introduce our parameters into the function scope 4119 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 4120 ParmVarDecl *Param = FD->getParamDecl(p); 4121 Param->setOwningFunction(FD); 4122 4123 // If this has an identifier, add it to the scope stack. 4124 if (Param->getIdentifier() && FnBodyScope) 4125 PushOnScopeChains(Param, FnBodyScope); 4126 } 4127 4128 // Checking attributes of current function definition 4129 // dllimport attribute. 4130 if (FD->getAttr<DLLImportAttr>() && 4131 (!FD->getAttr<DLLExportAttr>())) { 4132 // dllimport attribute cannot be applied to definition. 4133 if (!(FD->getAttr<DLLImportAttr>())->isInherited()) { 4134 Diag(FD->getLocation(), 4135 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 4136 << "dllimport"; 4137 FD->setInvalidDecl(); 4138 return DeclPtrTy::make(FD); 4139 } else { 4140 // If a symbol previously declared dllimport is later defined, the 4141 // attribute is ignored in subsequent references, and a warning is 4142 // emitted. 4143 Diag(FD->getLocation(), 4144 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 4145 << FD->getNameAsCString() << "dllimport"; 4146 } 4147 } 4148 return DeclPtrTy::make(FD); 4149} 4150 4151Sema::DeclPtrTy Sema::ActOnFinishFunctionBody(DeclPtrTy D, StmtArg BodyArg) { 4152 return ActOnFinishFunctionBody(D, move(BodyArg), false); 4153} 4154 4155Sema::DeclPtrTy Sema::ActOnFinishFunctionBody(DeclPtrTy D, StmtArg BodyArg, 4156 bool IsInstantiation) { 4157 Decl *dcl = D.getAs<Decl>(); 4158 Stmt *Body = BodyArg.takeAs<Stmt>(); 4159 4160 // Don't generate EH edges for CallExprs as we'd like to avoid the n^2 4161 // explosion for destrutors that can result and the compile time hit. 4162 AnalysisContext AC(dcl, false); 4163 FunctionDecl *FD = 0; 4164 FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl); 4165 if (FunTmpl) 4166 FD = FunTmpl->getTemplatedDecl(); 4167 else 4168 FD = dyn_cast_or_null<FunctionDecl>(dcl); 4169 4170 if (FD) { 4171 FD->setBody(Body); 4172 if (FD->isMain()) 4173 // C and C++ allow for main to automagically return 0. 4174 // Implements C++ [basic.start.main]p5 and C99 5.1.2.2.3. 4175 FD->setHasImplicitReturnZero(true); 4176 else 4177 CheckFallThroughForFunctionDef(FD, Body, AC); 4178 4179 if (!FD->isInvalidDecl()) 4180 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end()); 4181 4182 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FD)) 4183 MaybeMarkVirtualMembersReferenced(Method->getLocation(), Method); 4184 4185 assert(FD == getCurFunctionDecl() && "Function parsing confused"); 4186 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 4187 assert(MD == getCurMethodDecl() && "Method parsing confused"); 4188 MD->setBody(Body); 4189 CheckFallThroughForFunctionDef(MD, Body, AC); 4190 MD->setEndLoc(Body->getLocEnd()); 4191 4192 if (!MD->isInvalidDecl()) 4193 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end()); 4194 } else { 4195 Body->Destroy(Context); 4196 return DeclPtrTy(); 4197 } 4198 if (!IsInstantiation) 4199 PopDeclContext(); 4200 4201 // Verify and clean out per-function state. 4202 4203 assert(&getLabelMap() == &FunctionLabelMap && "Didn't pop block right?"); 4204 4205 // Check goto/label use. 4206 for (llvm::DenseMap<IdentifierInfo*, LabelStmt*>::iterator 4207 I = FunctionLabelMap.begin(), E = FunctionLabelMap.end(); I != E; ++I) { 4208 LabelStmt *L = I->second; 4209 4210 // Verify that we have no forward references left. If so, there was a goto 4211 // or address of a label taken, but no definition of it. Label fwd 4212 // definitions are indicated with a null substmt. 4213 if (L->getSubStmt() != 0) 4214 continue; 4215 4216 // Emit error. 4217 Diag(L->getIdentLoc(), diag::err_undeclared_label_use) << L->getName(); 4218 4219 // At this point, we have gotos that use the bogus label. Stitch it into 4220 // the function body so that they aren't leaked and that the AST is well 4221 // formed. 4222 if (Body == 0) { 4223 // The whole function wasn't parsed correctly, just delete this. 4224 L->Destroy(Context); 4225 continue; 4226 } 4227 4228 // Otherwise, the body is valid: we want to stitch the label decl into the 4229 // function somewhere so that it is properly owned and so that the goto 4230 // has a valid target. Do this by creating a new compound stmt with the 4231 // label in it. 4232 4233 // Give the label a sub-statement. 4234 L->setSubStmt(new (Context) NullStmt(L->getIdentLoc())); 4235 4236 CompoundStmt *Compound = isa<CXXTryStmt>(Body) ? 4237 cast<CXXTryStmt>(Body)->getTryBlock() : 4238 cast<CompoundStmt>(Body); 4239 std::vector<Stmt*> Elements(Compound->body_begin(), Compound->body_end()); 4240 Elements.push_back(L); 4241 Compound->setStmts(Context, &Elements[0], Elements.size()); 4242 } 4243 FunctionLabelMap.clear(); 4244 4245 if (!Body) return D; 4246 4247 CheckUnreachable(AC); 4248 4249 // Verify that that gotos and switch cases don't jump into scopes illegally. 4250 if (CurFunctionNeedsScopeChecking) 4251 DiagnoseInvalidJumps(Body); 4252 4253 // C++ constructors that have function-try-blocks can't have return 4254 // statements in the handlers of that block. (C++ [except.handle]p14) 4255 // Verify this. 4256 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body)) 4257 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); 4258 4259 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) 4260 MarkBaseAndMemberDestructorsReferenced(Destructor); 4261 4262 // If any errors have occurred, clear out any temporaries that may have 4263 // been leftover. This ensures that these temporaries won't be picked up for 4264 // deletion in some later function. 4265 if (PP.getDiagnostics().hasErrorOccurred()) 4266 ExprTemporaries.clear(); 4267 4268 assert(ExprTemporaries.empty() && "Leftover temporaries in function"); 4269 return D; 4270} 4271 4272/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 4273/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 4274NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 4275 IdentifierInfo &II, Scope *S) { 4276 // Before we produce a declaration for an implicitly defined 4277 // function, see whether there was a locally-scoped declaration of 4278 // this name as a function or variable. If so, use that 4279 // (non-visible) declaration, and complain about it. 4280 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 4281 = LocallyScopedExternalDecls.find(&II); 4282 if (Pos != LocallyScopedExternalDecls.end()) { 4283 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 4284 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 4285 return Pos->second; 4286 } 4287 4288 // Extension in C99. Legal in C90, but warn about it. 4289 if (II.getName().startswith("__builtin_")) 4290 Diag(Loc, diag::warn_builtin_unknown) << &II; 4291 else if (getLangOptions().C99) 4292 Diag(Loc, diag::ext_implicit_function_decl) << &II; 4293 else 4294 Diag(Loc, diag::warn_implicit_function_decl) << &II; 4295 4296 // Set a Declarator for the implicit definition: int foo(); 4297 const char *Dummy; 4298 DeclSpec DS; 4299 unsigned DiagID; 4300 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID); 4301 Error = Error; // Silence warning. 4302 assert(!Error && "Error setting up implicit decl!"); 4303 Declarator D(DS, Declarator::BlockContext); 4304 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0, 4305 0, 0, false, SourceLocation(), 4306 false, 0,0,0, Loc, Loc, D), 4307 SourceLocation()); 4308 D.SetIdentifier(&II, Loc); 4309 4310 // Insert this function into translation-unit scope. 4311 4312 DeclContext *PrevDC = CurContext; 4313 CurContext = Context.getTranslationUnitDecl(); 4314 4315 FunctionDecl *FD = 4316 dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D).getAs<Decl>()); 4317 FD->setImplicit(); 4318 4319 CurContext = PrevDC; 4320 4321 AddKnownFunctionAttributes(FD); 4322 4323 return FD; 4324} 4325 4326/// \brief Adds any function attributes that we know a priori based on 4327/// the declaration of this function. 4328/// 4329/// These attributes can apply both to implicitly-declared builtins 4330/// (like __builtin___printf_chk) or to library-declared functions 4331/// like NSLog or printf. 4332void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 4333 if (FD->isInvalidDecl()) 4334 return; 4335 4336 // If this is a built-in function, map its builtin attributes to 4337 // actual attributes. 4338 if (unsigned BuiltinID = FD->getBuiltinID()) { 4339 // Handle printf-formatting attributes. 4340 unsigned FormatIdx; 4341 bool HasVAListArg; 4342 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 4343 if (!FD->getAttr<FormatAttr>()) 4344 FD->addAttr(::new (Context) FormatAttr(Context, "printf", FormatIdx+1, 4345 HasVAListArg ? 0 : FormatIdx+2)); 4346 } 4347 4348 // Mark const if we don't care about errno and that is the only 4349 // thing preventing the function from being const. This allows 4350 // IRgen to use LLVM intrinsics for such functions. 4351 if (!getLangOptions().MathErrno && 4352 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 4353 if (!FD->getAttr<ConstAttr>()) 4354 FD->addAttr(::new (Context) ConstAttr()); 4355 } 4356 4357 if (Context.BuiltinInfo.isNoReturn(BuiltinID)) 4358 FD->setType(Context.getNoReturnType(FD->getType())); 4359 if (Context.BuiltinInfo.isNoThrow(BuiltinID)) 4360 FD->addAttr(::new (Context) NoThrowAttr()); 4361 if (Context.BuiltinInfo.isConst(BuiltinID)) 4362 FD->addAttr(::new (Context) ConstAttr()); 4363 } 4364 4365 IdentifierInfo *Name = FD->getIdentifier(); 4366 if (!Name) 4367 return; 4368 if ((!getLangOptions().CPlusPlus && 4369 FD->getDeclContext()->isTranslationUnit()) || 4370 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 4371 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 4372 LinkageSpecDecl::lang_c)) { 4373 // Okay: this could be a libc/libm/Objective-C function we know 4374 // about. 4375 } else 4376 return; 4377 4378 if (Name->isStr("NSLog") || Name->isStr("NSLogv")) { 4379 // FIXME: NSLog and NSLogv should be target specific 4380 if (const FormatAttr *Format = FD->getAttr<FormatAttr>()) { 4381 // FIXME: We known better than our headers. 4382 const_cast<FormatAttr *>(Format)->setType(Context, "printf"); 4383 } else 4384 FD->addAttr(::new (Context) FormatAttr(Context, "printf", 1, 4385 Name->isStr("NSLogv") ? 0 : 2)); 4386 } else if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { 4387 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be 4388 // target-specific builtins, perhaps? 4389 if (!FD->getAttr<FormatAttr>()) 4390 FD->addAttr(::new (Context) FormatAttr(Context, "printf", 2, 4391 Name->isStr("vasprintf") ? 0 : 3)); 4392 } 4393} 4394 4395TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 4396 TypeSourceInfo *TInfo) { 4397 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 4398 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 4399 4400 if (!TInfo) { 4401 assert(D.isInvalidType() && "no declarator info for valid type"); 4402 TInfo = Context.getTrivialTypeSourceInfo(T); 4403 } 4404 4405 // Scope manipulation handled by caller. 4406 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 4407 D.getIdentifierLoc(), 4408 D.getIdentifier(), 4409 TInfo); 4410 4411 if (const TagType *TT = T->getAs<TagType>()) { 4412 TagDecl *TD = TT->getDecl(); 4413 4414 // If the TagDecl that the TypedefDecl points to is an anonymous decl 4415 // keep track of the TypedefDecl. 4416 if (!TD->getIdentifier() && !TD->getTypedefForAnonDecl()) 4417 TD->setTypedefForAnonDecl(NewTD); 4418 } 4419 4420 if (D.isInvalidType()) 4421 NewTD->setInvalidDecl(); 4422 return NewTD; 4423} 4424 4425 4426/// \brief Determine whether a tag with a given kind is acceptable 4427/// as a redeclaration of the given tag declaration. 4428/// 4429/// \returns true if the new tag kind is acceptable, false otherwise. 4430bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, 4431 TagDecl::TagKind NewTag, 4432 SourceLocation NewTagLoc, 4433 const IdentifierInfo &Name) { 4434 // C++ [dcl.type.elab]p3: 4435 // The class-key or enum keyword present in the 4436 // elaborated-type-specifier shall agree in kind with the 4437 // declaration to which the name in theelaborated-type-specifier 4438 // refers. This rule also applies to the form of 4439 // elaborated-type-specifier that declares a class-name or 4440 // friend class since it can be construed as referring to the 4441 // definition of the class. Thus, in any 4442 // elaborated-type-specifier, the enum keyword shall be used to 4443 // refer to an enumeration (7.2), the union class-keyshall be 4444 // used to refer to a union (clause 9), and either the class or 4445 // struct class-key shall be used to refer to a class (clause 9) 4446 // declared using the class or struct class-key. 4447 TagDecl::TagKind OldTag = Previous->getTagKind(); 4448 if (OldTag == NewTag) 4449 return true; 4450 4451 if ((OldTag == TagDecl::TK_struct || OldTag == TagDecl::TK_class) && 4452 (NewTag == TagDecl::TK_struct || NewTag == TagDecl::TK_class)) { 4453 // Warn about the struct/class tag mismatch. 4454 bool isTemplate = false; 4455 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) 4456 isTemplate = Record->getDescribedClassTemplate(); 4457 4458 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 4459 << (NewTag == TagDecl::TK_class) 4460 << isTemplate << &Name 4461 << CodeModificationHint::CreateReplacement(SourceRange(NewTagLoc), 4462 OldTag == TagDecl::TK_class? "class" : "struct"); 4463 Diag(Previous->getLocation(), diag::note_previous_use); 4464 return true; 4465 } 4466 return false; 4467} 4468 4469/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 4470/// former case, Name will be non-null. In the later case, Name will be null. 4471/// TagSpec indicates what kind of tag this is. TUK indicates whether this is a 4472/// reference/declaration/definition of a tag. 4473Sema::DeclPtrTy Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK, 4474 SourceLocation KWLoc, const CXXScopeSpec &SS, 4475 IdentifierInfo *Name, SourceLocation NameLoc, 4476 AttributeList *Attr, AccessSpecifier AS, 4477 MultiTemplateParamsArg TemplateParameterLists, 4478 bool &OwnedDecl, bool &IsDependent) { 4479 // If this is not a definition, it must have a name. 4480 assert((Name != 0 || TUK == TUK_Definition) && 4481 "Nameless record must be a definition!"); 4482 4483 OwnedDecl = false; 4484 TagDecl::TagKind Kind = TagDecl::getTagKindForTypeSpec(TagSpec); 4485 4486 // FIXME: Check explicit specializations more carefully. 4487 bool isExplicitSpecialization = false; 4488 if (TUK != TUK_Reference) { 4489 if (TemplateParameterList *TemplateParams 4490 = MatchTemplateParametersToScopeSpecifier(KWLoc, SS, 4491 (TemplateParameterList**)TemplateParameterLists.get(), 4492 TemplateParameterLists.size(), 4493 isExplicitSpecialization)) { 4494 if (TemplateParams->size() > 0) { 4495 // This is a declaration or definition of a class template (which may 4496 // be a member of another template). 4497 OwnedDecl = false; 4498 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc, 4499 SS, Name, NameLoc, Attr, 4500 TemplateParams, 4501 AS); 4502 TemplateParameterLists.release(); 4503 return Result.get(); 4504 } else { 4505 // The "template<>" header is extraneous. 4506 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 4507 << ElaboratedType::getNameForTagKind(Kind) << Name; 4508 isExplicitSpecialization = true; 4509 } 4510 } 4511 4512 TemplateParameterLists.release(); 4513 } 4514 4515 DeclContext *SearchDC = CurContext; 4516 DeclContext *DC = CurContext; 4517 bool isStdBadAlloc = false; 4518 bool Invalid = false; 4519 4520 RedeclarationKind Redecl = (TUK != TUK_Reference ? ForRedeclaration 4521 : NotForRedeclaration); 4522 4523 LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl); 4524 4525 if (Name && SS.isNotEmpty()) { 4526 // We have a nested-name tag ('struct foo::bar'). 4527 4528 // Check for invalid 'foo::'. 4529 if (SS.isInvalid()) { 4530 Name = 0; 4531 goto CreateNewDecl; 4532 } 4533 4534 // If this is a friend or a reference to a class in a dependent 4535 // context, don't try to make a decl for it. 4536 if (TUK == TUK_Friend || TUK == TUK_Reference) { 4537 DC = computeDeclContext(SS, false); 4538 if (!DC) { 4539 IsDependent = true; 4540 return DeclPtrTy(); 4541 } 4542 } 4543 4544 if (RequireCompleteDeclContext(SS)) 4545 return DeclPtrTy::make((Decl *)0); 4546 4547 DC = computeDeclContext(SS, true); 4548 SearchDC = DC; 4549 // Look-up name inside 'foo::'. 4550 LookupQualifiedName(Previous, DC); 4551 4552 if (Previous.isAmbiguous()) 4553 return DeclPtrTy(); 4554 4555 if (Previous.empty()) { 4556 // Name lookup did not find anything. However, if the 4557 // nested-name-specifier refers to the current instantiation, 4558 // and that current instantiation has any dependent base 4559 // classes, we might find something at instantiation time: treat 4560 // this as a dependent elaborated-type-specifier. 4561 if (Previous.wasNotFoundInCurrentInstantiation()) { 4562 IsDependent = true; 4563 return DeclPtrTy(); 4564 } 4565 4566 // A tag 'foo::bar' must already exist. 4567 Diag(NameLoc, diag::err_not_tag_in_scope) << Name << SS.getRange(); 4568 Name = 0; 4569 Invalid = true; 4570 goto CreateNewDecl; 4571 } 4572 } else if (Name) { 4573 // If this is a named struct, check to see if there was a previous forward 4574 // declaration or definition. 4575 // FIXME: We're looking into outer scopes here, even when we 4576 // shouldn't be. Doing so can result in ambiguities that we 4577 // shouldn't be diagnosing. 4578 LookupName(Previous, S); 4579 4580 // Note: there used to be some attempt at recovery here. 4581 if (Previous.isAmbiguous()) 4582 return DeclPtrTy(); 4583 4584 if (!getLangOptions().CPlusPlus && TUK != TUK_Reference) { 4585 // FIXME: This makes sure that we ignore the contexts associated 4586 // with C structs, unions, and enums when looking for a matching 4587 // tag declaration or definition. See the similar lookup tweak 4588 // in Sema::LookupName; is there a better way to deal with this? 4589 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 4590 SearchDC = SearchDC->getParent(); 4591 } 4592 } 4593 4594 if (Previous.isSingleResult() && 4595 Previous.getFoundDecl()->isTemplateParameter()) { 4596 // Maybe we will complain about the shadowed template parameter. 4597 DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl()); 4598 // Just pretend that we didn't see the previous declaration. 4599 Previous.clear(); 4600 } 4601 4602 if (getLangOptions().CPlusPlus && Name && DC && StdNamespace && 4603 DC->Equals(StdNamespace) && Name->isStr("bad_alloc")) { 4604 // This is a declaration of or a reference to "std::bad_alloc". 4605 isStdBadAlloc = true; 4606 4607 if (Previous.empty() && StdBadAlloc) { 4608 // std::bad_alloc has been implicitly declared (but made invisible to 4609 // name lookup). Fill in this implicit declaration as the previous 4610 // declaration, so that the declarations get chained appropriately. 4611 Previous.addDecl(StdBadAlloc); 4612 } 4613 } 4614 4615 if (!Previous.empty()) { 4616 assert(Previous.isSingleResult()); 4617 NamedDecl *PrevDecl = Previous.getFoundDecl(); 4618 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 4619 // If this is a use of a previous tag, or if the tag is already declared 4620 // in the same scope (so that the definition/declaration completes or 4621 // rementions the tag), reuse the decl. 4622 if (TUK == TUK_Reference || TUK == TUK_Friend || 4623 isDeclInScope(PrevDecl, SearchDC, S)) { 4624 // Make sure that this wasn't declared as an enum and now used as a 4625 // struct or something similar. 4626 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, KWLoc, *Name)) { 4627 bool SafeToContinue 4628 = (PrevTagDecl->getTagKind() != TagDecl::TK_enum && 4629 Kind != TagDecl::TK_enum); 4630 if (SafeToContinue) 4631 Diag(KWLoc, diag::err_use_with_wrong_tag) 4632 << Name 4633 << CodeModificationHint::CreateReplacement(SourceRange(KWLoc), 4634 PrevTagDecl->getKindName()); 4635 else 4636 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 4637 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 4638 4639 if (SafeToContinue) 4640 Kind = PrevTagDecl->getTagKind(); 4641 else { 4642 // Recover by making this an anonymous redefinition. 4643 Name = 0; 4644 Previous.clear(); 4645 Invalid = true; 4646 } 4647 } 4648 4649 if (!Invalid) { 4650 // If this is a use, just return the declaration we found. 4651 4652 // FIXME: In the future, return a variant or some other clue 4653 // for the consumer of this Decl to know it doesn't own it. 4654 // For our current ASTs this shouldn't be a problem, but will 4655 // need to be changed with DeclGroups. 4656 if (TUK == TUK_Reference || TUK == TUK_Friend) 4657 return DeclPtrTy::make(PrevTagDecl); 4658 4659 // Diagnose attempts to redefine a tag. 4660 if (TUK == TUK_Definition) { 4661 if (TagDecl *Def = PrevTagDecl->getDefinition()) { 4662 // If we're defining a specialization and the previous definition 4663 // is from an implicit instantiation, don't emit an error 4664 // here; we'll catch this in the general case below. 4665 if (!isExplicitSpecialization || 4666 !isa<CXXRecordDecl>(Def) || 4667 cast<CXXRecordDecl>(Def)->getTemplateSpecializationKind() 4668 == TSK_ExplicitSpecialization) { 4669 Diag(NameLoc, diag::err_redefinition) << Name; 4670 Diag(Def->getLocation(), diag::note_previous_definition); 4671 // If this is a redefinition, recover by making this 4672 // struct be anonymous, which will make any later 4673 // references get the previous definition. 4674 Name = 0; 4675 Previous.clear(); 4676 Invalid = true; 4677 } 4678 } else { 4679 // If the type is currently being defined, complain 4680 // about a nested redefinition. 4681 TagType *Tag = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 4682 if (Tag->isBeingDefined()) { 4683 Diag(NameLoc, diag::err_nested_redefinition) << Name; 4684 Diag(PrevTagDecl->getLocation(), 4685 diag::note_previous_definition); 4686 Name = 0; 4687 Previous.clear(); 4688 Invalid = true; 4689 } 4690 } 4691 4692 // Okay, this is definition of a previously declared or referenced 4693 // tag PrevDecl. We're going to create a new Decl for it. 4694 } 4695 } 4696 // If we get here we have (another) forward declaration or we 4697 // have a definition. Just create a new decl. 4698 4699 } else { 4700 // If we get here, this is a definition of a new tag type in a nested 4701 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 4702 // new decl/type. We set PrevDecl to NULL so that the entities 4703 // have distinct types. 4704 Previous.clear(); 4705 } 4706 // If we get here, we're going to create a new Decl. If PrevDecl 4707 // is non-NULL, it's a definition of the tag declared by 4708 // PrevDecl. If it's NULL, we have a new definition. 4709 } else { 4710 // PrevDecl is a namespace, template, or anything else 4711 // that lives in the IDNS_Tag identifier namespace. 4712 if (isDeclInScope(PrevDecl, SearchDC, S)) { 4713 // The tag name clashes with a namespace name, issue an error and 4714 // recover by making this tag be anonymous. 4715 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 4716 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4717 Name = 0; 4718 Previous.clear(); 4719 Invalid = true; 4720 } else { 4721 // The existing declaration isn't relevant to us; we're in a 4722 // new scope, so clear out the previous declaration. 4723 Previous.clear(); 4724 } 4725 } 4726 } else if (TUK == TUK_Reference && SS.isEmpty() && Name) { 4727 // C++ [basic.scope.pdecl]p5: 4728 // -- for an elaborated-type-specifier of the form 4729 // 4730 // class-key identifier 4731 // 4732 // if the elaborated-type-specifier is used in the 4733 // decl-specifier-seq or parameter-declaration-clause of a 4734 // function defined in namespace scope, the identifier is 4735 // declared as a class-name in the namespace that contains 4736 // the declaration; otherwise, except as a friend 4737 // declaration, the identifier is declared in the smallest 4738 // non-class, non-function-prototype scope that contains the 4739 // declaration. 4740 // 4741 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 4742 // C structs and unions. 4743 // 4744 // It is an error in C++ to declare (rather than define) an enum 4745 // type, including via an elaborated type specifier. We'll 4746 // diagnose that later; for now, declare the enum in the same 4747 // scope as we would have picked for any other tag type. 4748 // 4749 // GNU C also supports this behavior as part of its incomplete 4750 // enum types extension, while GNU C++ does not. 4751 // 4752 // Find the context where we'll be declaring the tag. 4753 // FIXME: We would like to maintain the current DeclContext as the 4754 // lexical context, 4755 while (SearchDC->isRecord()) 4756 SearchDC = SearchDC->getParent(); 4757 4758 // Find the scope where we'll be declaring the tag. 4759 while (S->isClassScope() || 4760 (getLangOptions().CPlusPlus && S->isFunctionPrototypeScope()) || 4761 ((S->getFlags() & Scope::DeclScope) == 0) || 4762 (S->getEntity() && 4763 ((DeclContext *)S->getEntity())->isTransparentContext())) 4764 S = S->getParent(); 4765 4766 } else if (TUK == TUK_Friend && SS.isEmpty() && Name) { 4767 // C++ [namespace.memdef]p3: 4768 // If a friend declaration in a non-local class first declares a 4769 // class or function, the friend class or function is a member of 4770 // the innermost enclosing namespace. 4771 while (!SearchDC->isFileContext()) 4772 SearchDC = SearchDC->getParent(); 4773 4774 // The entity of a decl scope is a DeclContext; see PushDeclContext. 4775 while (S->getEntity() != SearchDC) 4776 S = S->getParent(); 4777 } 4778 4779CreateNewDecl: 4780 4781 TagDecl *PrevDecl = 0; 4782 if (Previous.isSingleResult()) 4783 PrevDecl = cast<TagDecl>(Previous.getFoundDecl()); 4784 4785 // If there is an identifier, use the location of the identifier as the 4786 // location of the decl, otherwise use the location of the struct/union 4787 // keyword. 4788 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 4789 4790 // Otherwise, create a new declaration. If there is a previous 4791 // declaration of the same entity, the two will be linked via 4792 // PrevDecl. 4793 TagDecl *New; 4794 4795 if (Kind == TagDecl::TK_enum) { 4796 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 4797 // enum X { A, B, C } D; D should chain to X. 4798 New = EnumDecl::Create(Context, SearchDC, Loc, Name, KWLoc, 4799 cast_or_null<EnumDecl>(PrevDecl)); 4800 // If this is an undefined enum, warn. 4801 if (TUK != TUK_Definition && !Invalid) { 4802 unsigned DK = getLangOptions().CPlusPlus? diag::err_forward_ref_enum 4803 : diag::ext_forward_ref_enum; 4804 Diag(Loc, DK); 4805 } 4806 } else { 4807 // struct/union/class 4808 4809 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 4810 // struct X { int A; } D; D should chain to X. 4811 if (getLangOptions().CPlusPlus) { 4812 // FIXME: Look for a way to use RecordDecl for simple structs. 4813 New = CXXRecordDecl::Create(Context, Kind, SearchDC, Loc, Name, KWLoc, 4814 cast_or_null<CXXRecordDecl>(PrevDecl)); 4815 4816 if (isStdBadAlloc && (!StdBadAlloc || StdBadAlloc->isImplicit())) 4817 StdBadAlloc = cast<CXXRecordDecl>(New); 4818 } else 4819 New = RecordDecl::Create(Context, Kind, SearchDC, Loc, Name, KWLoc, 4820 cast_or_null<RecordDecl>(PrevDecl)); 4821 } 4822 4823 if (Kind != TagDecl::TK_enum) { 4824 // Handle #pragma pack: if the #pragma pack stack has non-default 4825 // alignment, make up a packed attribute for this decl. These 4826 // attributes are checked when the ASTContext lays out the 4827 // structure. 4828 // 4829 // It is important for implementing the correct semantics that this 4830 // happen here (in act on tag decl). The #pragma pack stack is 4831 // maintained as a result of parser callbacks which can occur at 4832 // many points during the parsing of a struct declaration (because 4833 // the #pragma tokens are effectively skipped over during the 4834 // parsing of the struct). 4835 if (unsigned Alignment = getPragmaPackAlignment()) 4836 New->addAttr(::new (Context) PragmaPackAttr(Alignment * 8)); 4837 } 4838 4839 if (getLangOptions().CPlusPlus && SS.isEmpty() && Name && !Invalid) { 4840 // C++ [dcl.typedef]p3: 4841 // [...] Similarly, in a given scope, a class or enumeration 4842 // shall not be declared with the same name as a typedef-name 4843 // that is declared in that scope and refers to a type other 4844 // than the class or enumeration itself. 4845 LookupResult Lookup(*this, Name, NameLoc, LookupOrdinaryName, 4846 ForRedeclaration); 4847 LookupName(Lookup, S); 4848 TypedefDecl *PrevTypedef = Lookup.getAsSingle<TypedefDecl>(); 4849 NamedDecl *PrevTypedefNamed = PrevTypedef; 4850 if (PrevTypedef && isDeclInScope(PrevTypedefNamed, SearchDC, S) && 4851 Context.getCanonicalType(Context.getTypeDeclType(PrevTypedef)) != 4852 Context.getCanonicalType(Context.getTypeDeclType(New))) { 4853 Diag(Loc, diag::err_tag_definition_of_typedef) 4854 << Context.getTypeDeclType(New) 4855 << PrevTypedef->getUnderlyingType(); 4856 Diag(PrevTypedef->getLocation(), diag::note_previous_definition); 4857 Invalid = true; 4858 } 4859 } 4860 4861 // If this is a specialization of a member class (of a class template), 4862 // check the specialization. 4863 if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous)) 4864 Invalid = true; 4865 4866 if (Invalid) 4867 New->setInvalidDecl(); 4868 4869 if (Attr) 4870 ProcessDeclAttributeList(S, New, Attr); 4871 4872 // If we're declaring or defining a tag in function prototype scope 4873 // in C, note that this type can only be used within the function. 4874 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 4875 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 4876 4877 // Set the lexical context. If the tag has a C++ scope specifier, the 4878 // lexical context will be different from the semantic context. 4879 New->setLexicalDeclContext(CurContext); 4880 4881 // Mark this as a friend decl if applicable. 4882 if (TUK == TUK_Friend) 4883 New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ !Previous.empty()); 4884 4885 // Set the access specifier. 4886 if (!Invalid && TUK != TUK_Friend) 4887 SetMemberAccessSpecifier(New, PrevDecl, AS); 4888 4889 if (TUK == TUK_Definition) 4890 New->startDefinition(); 4891 4892 // If this has an identifier, add it to the scope stack. 4893 if (TUK == TUK_Friend) { 4894 // We might be replacing an existing declaration in the lookup tables; 4895 // if so, borrow its access specifier. 4896 if (PrevDecl) 4897 New->setAccess(PrevDecl->getAccess()); 4898 4899 // Friend tag decls are visible in fairly strange ways. 4900 if (!CurContext->isDependentContext()) { 4901 DeclContext *DC = New->getDeclContext()->getLookupContext(); 4902 DC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 4903 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 4904 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false); 4905 } 4906 } else if (Name) { 4907 S = getNonFieldDeclScope(S); 4908 PushOnScopeChains(New, S); 4909 } else { 4910 CurContext->addDecl(New); 4911 } 4912 4913 // If this is the C FILE type, notify the AST context. 4914 if (IdentifierInfo *II = New->getIdentifier()) 4915 if (!New->isInvalidDecl() && 4916 New->getDeclContext()->getLookupContext()->isTranslationUnit() && 4917 II->isStr("FILE")) 4918 Context.setFILEDecl(New); 4919 4920 OwnedDecl = true; 4921 return DeclPtrTy::make(New); 4922} 4923 4924void Sema::ActOnTagStartDefinition(Scope *S, DeclPtrTy TagD) { 4925 AdjustDeclIfTemplate(TagD); 4926 TagDecl *Tag = cast<TagDecl>(TagD.getAs<Decl>()); 4927 4928 // Enter the tag context. 4929 PushDeclContext(S, Tag); 4930} 4931 4932void Sema::ActOnStartCXXMemberDeclarations(Scope *S, DeclPtrTy TagD, 4933 SourceLocation LBraceLoc) { 4934 AdjustDeclIfTemplate(TagD); 4935 CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD.getAs<Decl>()); 4936 4937 FieldCollector->StartClass(); 4938 4939 if (!Record->getIdentifier()) 4940 return; 4941 4942 // C++ [class]p2: 4943 // [...] The class-name is also inserted into the scope of the 4944 // class itself; this is known as the injected-class-name. For 4945 // purposes of access checking, the injected-class-name is treated 4946 // as if it were a public member name. 4947 CXXRecordDecl *InjectedClassName 4948 = CXXRecordDecl::Create(Context, Record->getTagKind(), 4949 CurContext, Record->getLocation(), 4950 Record->getIdentifier(), 4951 Record->getTagKeywordLoc(), 4952 Record); 4953 InjectedClassName->setImplicit(); 4954 InjectedClassName->setAccess(AS_public); 4955 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 4956 InjectedClassName->setDescribedClassTemplate(Template); 4957 PushOnScopeChains(InjectedClassName, S); 4958 assert(InjectedClassName->isInjectedClassName() && 4959 "Broken injected-class-name"); 4960} 4961 4962// Traverses the class and any nested classes, making a note of any 4963// dynamic classes that have no key function so that we can mark all of 4964// their virtual member functions as "used" at the end of the translation 4965// unit. This ensures that all functions needed by the vtable will get 4966// instantiated/synthesized. 4967static void 4968RecordDynamicClassesWithNoKeyFunction(Sema &S, CXXRecordDecl *Record, 4969 SourceLocation Loc) { 4970 // We don't look at dependent or undefined classes. 4971 if (Record->isDependentContext() || !Record->isDefinition()) 4972 return; 4973 4974 if (Record->isDynamicClass()) { 4975 const CXXMethodDecl *KeyFunction = S.Context.getKeyFunction(Record); 4976 4977 if (!KeyFunction) 4978 S.ClassesWithUnmarkedVirtualMembers.push_back(std::make_pair(Record, 4979 Loc)); 4980 4981 if ((!KeyFunction || (KeyFunction->getBody() && KeyFunction->isInlined())) 4982 && Record->getLinkage() == ExternalLinkage) 4983 S.Diag(Record->getLocation(), diag::warn_weak_vtable) << Record; 4984 } 4985 for (DeclContext::decl_iterator D = Record->decls_begin(), 4986 DEnd = Record->decls_end(); 4987 D != DEnd; ++D) { 4988 if (CXXRecordDecl *Nested = dyn_cast<CXXRecordDecl>(*D)) 4989 RecordDynamicClassesWithNoKeyFunction(S, Nested, Loc); 4990 } 4991} 4992 4993void Sema::ActOnTagFinishDefinition(Scope *S, DeclPtrTy TagD, 4994 SourceLocation RBraceLoc) { 4995 AdjustDeclIfTemplate(TagD); 4996 TagDecl *Tag = cast<TagDecl>(TagD.getAs<Decl>()); 4997 Tag->setRBraceLoc(RBraceLoc); 4998 4999 if (isa<CXXRecordDecl>(Tag)) 5000 FieldCollector->FinishClass(); 5001 5002 // Exit this scope of this tag's definition. 5003 PopDeclContext(); 5004 5005 if (isa<CXXRecordDecl>(Tag) && !Tag->getDeclContext()->isRecord()) 5006 RecordDynamicClassesWithNoKeyFunction(*this, cast<CXXRecordDecl>(Tag), 5007 RBraceLoc); 5008 5009 // Notify the consumer that we've defined a tag. 5010 Consumer.HandleTagDeclDefinition(Tag); 5011} 5012 5013// Note that FieldName may be null for anonymous bitfields. 5014bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName, 5015 QualType FieldTy, const Expr *BitWidth, 5016 bool *ZeroWidth) { 5017 // Default to true; that shouldn't confuse checks for emptiness 5018 if (ZeroWidth) 5019 *ZeroWidth = true; 5020 5021 // C99 6.7.2.1p4 - verify the field type. 5022 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 5023 if (!FieldTy->isDependentType() && !FieldTy->isIntegralType()) { 5024 // Handle incomplete types with specific error. 5025 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 5026 return true; 5027 if (FieldName) 5028 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 5029 << FieldName << FieldTy << BitWidth->getSourceRange(); 5030 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) 5031 << FieldTy << BitWidth->getSourceRange(); 5032 } 5033 5034 // If the bit-width is type- or value-dependent, don't try to check 5035 // it now. 5036 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 5037 return false; 5038 5039 llvm::APSInt Value; 5040 if (VerifyIntegerConstantExpression(BitWidth, &Value)) 5041 return true; 5042 5043 if (Value != 0 && ZeroWidth) 5044 *ZeroWidth = false; 5045 5046 // Zero-width bitfield is ok for anonymous field. 5047 if (Value == 0 && FieldName) 5048 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 5049 5050 if (Value.isSigned() && Value.isNegative()) { 5051 if (FieldName) 5052 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 5053 << FieldName << Value.toString(10); 5054 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) 5055 << Value.toString(10); 5056 } 5057 5058 if (!FieldTy->isDependentType()) { 5059 uint64_t TypeSize = Context.getTypeSize(FieldTy); 5060 if (Value.getZExtValue() > TypeSize) { 5061 if (FieldName) 5062 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 5063 << FieldName << (unsigned)TypeSize; 5064 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) 5065 << (unsigned)TypeSize; 5066 } 5067 } 5068 5069 return false; 5070} 5071 5072/// ActOnField - Each field of a struct/union/class is passed into this in order 5073/// to create a FieldDecl object for it. 5074Sema::DeclPtrTy Sema::ActOnField(Scope *S, DeclPtrTy TagD, 5075 SourceLocation DeclStart, 5076 Declarator &D, ExprTy *BitfieldWidth) { 5077 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD.getAs<Decl>()), 5078 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 5079 AS_public); 5080 return DeclPtrTy::make(Res); 5081} 5082 5083/// HandleField - Analyze a field of a C struct or a C++ data member. 5084/// 5085FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 5086 SourceLocation DeclStart, 5087 Declarator &D, Expr *BitWidth, 5088 AccessSpecifier AS) { 5089 IdentifierInfo *II = D.getIdentifier(); 5090 SourceLocation Loc = DeclStart; 5091 if (II) Loc = D.getIdentifierLoc(); 5092 5093 TypeSourceInfo *TInfo = 0; 5094 QualType T = GetTypeForDeclarator(D, S, &TInfo); 5095 if (getLangOptions().CPlusPlus) 5096 CheckExtraCXXDefaultArguments(D); 5097 5098 DiagnoseFunctionSpecifiers(D); 5099 5100 if (D.getDeclSpec().isThreadSpecified()) 5101 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 5102 5103 NamedDecl *PrevDecl = LookupSingleName(S, II, LookupMemberName, 5104 ForRedeclaration); 5105 5106 if (PrevDecl && PrevDecl->isTemplateParameter()) { 5107 // Maybe we will complain about the shadowed template parameter. 5108 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 5109 // Just pretend that we didn't see the previous declaration. 5110 PrevDecl = 0; 5111 } 5112 5113 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 5114 PrevDecl = 0; 5115 5116 bool Mutable 5117 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable); 5118 SourceLocation TSSL = D.getSourceRange().getBegin(); 5119 FieldDecl *NewFD 5120 = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, TSSL, 5121 AS, PrevDecl, &D); 5122 if (NewFD->isInvalidDecl() && PrevDecl) { 5123 // Don't introduce NewFD into scope; there's already something 5124 // with the same name in the same scope. 5125 } else if (II) { 5126 PushOnScopeChains(NewFD, S); 5127 } else 5128 Record->addDecl(NewFD); 5129 5130 return NewFD; 5131} 5132 5133/// \brief Build a new FieldDecl and check its well-formedness. 5134/// 5135/// This routine builds a new FieldDecl given the fields name, type, 5136/// record, etc. \p PrevDecl should refer to any previous declaration 5137/// with the same name and in the same scope as the field to be 5138/// created. 5139/// 5140/// \returns a new FieldDecl. 5141/// 5142/// \todo The Declarator argument is a hack. It will be removed once 5143FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 5144 TypeSourceInfo *TInfo, 5145 RecordDecl *Record, SourceLocation Loc, 5146 bool Mutable, Expr *BitWidth, 5147 SourceLocation TSSL, 5148 AccessSpecifier AS, NamedDecl *PrevDecl, 5149 Declarator *D) { 5150 IdentifierInfo *II = Name.getAsIdentifierInfo(); 5151 bool InvalidDecl = false; 5152 if (D) InvalidDecl = D->isInvalidType(); 5153 5154 // If we receive a broken type, recover by assuming 'int' and 5155 // marking this declaration as invalid. 5156 if (T.isNull()) { 5157 InvalidDecl = true; 5158 T = Context.IntTy; 5159 } 5160 5161 QualType EltTy = Context.getBaseElementType(T); 5162 if (!EltTy->isDependentType() && 5163 RequireCompleteType(Loc, EltTy, diag::err_field_incomplete)) 5164 InvalidDecl = true; 5165 5166 // C99 6.7.2.1p8: A member of a structure or union may have any type other 5167 // than a variably modified type. 5168 if (!InvalidDecl && T->isVariablyModifiedType()) { 5169 bool SizeIsNegative; 5170 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 5171 SizeIsNegative); 5172 if (!FixedTy.isNull()) { 5173 Diag(Loc, diag::warn_illegal_constant_array_size); 5174 T = FixedTy; 5175 } else { 5176 if (SizeIsNegative) 5177 Diag(Loc, diag::err_typecheck_negative_array_size); 5178 else 5179 Diag(Loc, diag::err_typecheck_field_variable_size); 5180 InvalidDecl = true; 5181 } 5182 } 5183 5184 // Fields can not have abstract class types 5185 if (!InvalidDecl && RequireNonAbstractType(Loc, T, 5186 diag::err_abstract_type_in_decl, 5187 AbstractFieldType)) 5188 InvalidDecl = true; 5189 5190 bool ZeroWidth = false; 5191 // If this is declared as a bit-field, check the bit-field. 5192 if (!InvalidDecl && BitWidth && 5193 VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth)) { 5194 InvalidDecl = true; 5195 DeleteExpr(BitWidth); 5196 BitWidth = 0; 5197 ZeroWidth = false; 5198 } 5199 5200 FieldDecl *NewFD = FieldDecl::Create(Context, Record, Loc, II, T, TInfo, 5201 BitWidth, Mutable); 5202 if (InvalidDecl) 5203 NewFD->setInvalidDecl(); 5204 5205 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 5206 Diag(Loc, diag::err_duplicate_member) << II; 5207 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 5208 NewFD->setInvalidDecl(); 5209 } 5210 5211 if (!InvalidDecl && getLangOptions().CPlusPlus) { 5212 CXXRecordDecl* CXXRecord = cast<CXXRecordDecl>(Record); 5213 5214 if (!T->isPODType()) 5215 CXXRecord->setPOD(false); 5216 if (!ZeroWidth) 5217 CXXRecord->setEmpty(false); 5218 5219 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 5220 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 5221 5222 if (!RDecl->hasTrivialConstructor()) 5223 CXXRecord->setHasTrivialConstructor(false); 5224 if (!RDecl->hasTrivialCopyConstructor()) 5225 CXXRecord->setHasTrivialCopyConstructor(false); 5226 if (!RDecl->hasTrivialCopyAssignment()) 5227 CXXRecord->setHasTrivialCopyAssignment(false); 5228 if (!RDecl->hasTrivialDestructor()) 5229 CXXRecord->setHasTrivialDestructor(false); 5230 5231 // C++ 9.5p1: An object of a class with a non-trivial 5232 // constructor, a non-trivial copy constructor, a non-trivial 5233 // destructor, or a non-trivial copy assignment operator 5234 // cannot be a member of a union, nor can an array of such 5235 // objects. 5236 // TODO: C++0x alters this restriction significantly. 5237 if (Record->isUnion()) { 5238 // We check for copy constructors before constructors 5239 // because otherwise we'll never get complaints about 5240 // copy constructors. 5241 5242 const CXXSpecialMember invalid = (CXXSpecialMember) -1; 5243 5244 CXXSpecialMember member; 5245 if (!RDecl->hasTrivialCopyConstructor()) 5246 member = CXXCopyConstructor; 5247 else if (!RDecl->hasTrivialConstructor()) 5248 member = CXXDefaultConstructor; 5249 else if (!RDecl->hasTrivialCopyAssignment()) 5250 member = CXXCopyAssignment; 5251 else if (!RDecl->hasTrivialDestructor()) 5252 member = CXXDestructor; 5253 else 5254 member = invalid; 5255 5256 if (member != invalid) { 5257 Diag(Loc, diag::err_illegal_union_member) << Name << member; 5258 DiagnoseNontrivial(RT, member); 5259 NewFD->setInvalidDecl(); 5260 } 5261 } 5262 } 5263 } 5264 5265 // FIXME: We need to pass in the attributes given an AST 5266 // representation, not a parser representation. 5267 if (D) 5268 // FIXME: What to pass instead of TUScope? 5269 ProcessDeclAttributes(TUScope, NewFD, *D); 5270 5271 if (T.isObjCGCWeak()) 5272 Diag(Loc, diag::warn_attribute_weak_on_field); 5273 5274 NewFD->setAccess(AS); 5275 5276 // C++ [dcl.init.aggr]p1: 5277 // An aggregate is an array or a class (clause 9) with [...] no 5278 // private or protected non-static data members (clause 11). 5279 // A POD must be an aggregate. 5280 if (getLangOptions().CPlusPlus && 5281 (AS == AS_private || AS == AS_protected)) { 5282 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record); 5283 CXXRecord->setAggregate(false); 5284 CXXRecord->setPOD(false); 5285 } 5286 5287 return NewFD; 5288} 5289 5290/// DiagnoseNontrivial - Given that a class has a non-trivial 5291/// special member, figure out why. 5292void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) { 5293 QualType QT(T, 0U); 5294 CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl()); 5295 5296 // Check whether the member was user-declared. 5297 switch (member) { 5298 case CXXDefaultConstructor: 5299 if (RD->hasUserDeclaredConstructor()) { 5300 typedef CXXRecordDecl::ctor_iterator ctor_iter; 5301 for (ctor_iter ci = RD->ctor_begin(), ce = RD->ctor_end(); ci != ce;++ci){ 5302 const FunctionDecl *body = 0; 5303 ci->getBody(body); 5304 if (!body || 5305 !cast<CXXConstructorDecl>(body)->isImplicitlyDefined(Context)) { 5306 SourceLocation CtorLoc = ci->getLocation(); 5307 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 5308 return; 5309 } 5310 } 5311 5312 assert(0 && "found no user-declared constructors"); 5313 return; 5314 } 5315 break; 5316 5317 case CXXCopyConstructor: 5318 if (RD->hasUserDeclaredCopyConstructor()) { 5319 SourceLocation CtorLoc = 5320 RD->getCopyConstructor(Context, 0)->getLocation(); 5321 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 5322 return; 5323 } 5324 break; 5325 5326 case CXXCopyAssignment: 5327 if (RD->hasUserDeclaredCopyAssignment()) { 5328 // FIXME: this should use the location of the copy 5329 // assignment, not the type. 5330 SourceLocation TyLoc = RD->getSourceRange().getBegin(); 5331 Diag(TyLoc, diag::note_nontrivial_user_defined) << QT << member; 5332 return; 5333 } 5334 break; 5335 5336 case CXXDestructor: 5337 if (RD->hasUserDeclaredDestructor()) { 5338 SourceLocation DtorLoc = RD->getDestructor(Context)->getLocation(); 5339 Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member; 5340 return; 5341 } 5342 break; 5343 } 5344 5345 typedef CXXRecordDecl::base_class_iterator base_iter; 5346 5347 // Virtual bases and members inhibit trivial copying/construction, 5348 // but not trivial destruction. 5349 if (member != CXXDestructor) { 5350 // Check for virtual bases. vbases includes indirect virtual bases, 5351 // so we just iterate through the direct bases. 5352 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) 5353 if (bi->isVirtual()) { 5354 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 5355 Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1; 5356 return; 5357 } 5358 5359 // Check for virtual methods. 5360 typedef CXXRecordDecl::method_iterator meth_iter; 5361 for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me; 5362 ++mi) { 5363 if (mi->isVirtual()) { 5364 SourceLocation MLoc = mi->getSourceRange().getBegin(); 5365 Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0; 5366 return; 5367 } 5368 } 5369 } 5370 5371 bool (CXXRecordDecl::*hasTrivial)() const; 5372 switch (member) { 5373 case CXXDefaultConstructor: 5374 hasTrivial = &CXXRecordDecl::hasTrivialConstructor; break; 5375 case CXXCopyConstructor: 5376 hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break; 5377 case CXXCopyAssignment: 5378 hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break; 5379 case CXXDestructor: 5380 hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break; 5381 default: 5382 assert(0 && "unexpected special member"); return; 5383 } 5384 5385 // Check for nontrivial bases (and recurse). 5386 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) { 5387 const RecordType *BaseRT = bi->getType()->getAs<RecordType>(); 5388 assert(BaseRT && "Don't know how to handle dependent bases"); 5389 CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl()); 5390 if (!(BaseRecTy->*hasTrivial)()) { 5391 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 5392 Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member; 5393 DiagnoseNontrivial(BaseRT, member); 5394 return; 5395 } 5396 } 5397 5398 // Check for nontrivial members (and recurse). 5399 typedef RecordDecl::field_iterator field_iter; 5400 for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe; 5401 ++fi) { 5402 QualType EltTy = Context.getBaseElementType((*fi)->getType()); 5403 if (const RecordType *EltRT = EltTy->getAs<RecordType>()) { 5404 CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl()); 5405 5406 if (!(EltRD->*hasTrivial)()) { 5407 SourceLocation FLoc = (*fi)->getLocation(); 5408 Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member; 5409 DiagnoseNontrivial(EltRT, member); 5410 return; 5411 } 5412 } 5413 } 5414 5415 assert(0 && "found no explanation for non-trivial member"); 5416} 5417 5418/// TranslateIvarVisibility - Translate visibility from a token ID to an 5419/// AST enum value. 5420static ObjCIvarDecl::AccessControl 5421TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 5422 switch (ivarVisibility) { 5423 default: assert(0 && "Unknown visitibility kind"); 5424 case tok::objc_private: return ObjCIvarDecl::Private; 5425 case tok::objc_public: return ObjCIvarDecl::Public; 5426 case tok::objc_protected: return ObjCIvarDecl::Protected; 5427 case tok::objc_package: return ObjCIvarDecl::Package; 5428 } 5429} 5430 5431/// ActOnIvar - Each ivar field of an objective-c class is passed into this 5432/// in order to create an IvarDecl object for it. 5433Sema::DeclPtrTy Sema::ActOnIvar(Scope *S, 5434 SourceLocation DeclStart, 5435 DeclPtrTy IntfDecl, 5436 Declarator &D, ExprTy *BitfieldWidth, 5437 tok::ObjCKeywordKind Visibility) { 5438 5439 IdentifierInfo *II = D.getIdentifier(); 5440 Expr *BitWidth = (Expr*)BitfieldWidth; 5441 SourceLocation Loc = DeclStart; 5442 if (II) Loc = D.getIdentifierLoc(); 5443 5444 // FIXME: Unnamed fields can be handled in various different ways, for 5445 // example, unnamed unions inject all members into the struct namespace! 5446 5447 TypeSourceInfo *TInfo = 0; 5448 QualType T = GetTypeForDeclarator(D, S, &TInfo); 5449 5450 if (BitWidth) { 5451 // 6.7.2.1p3, 6.7.2.1p4 5452 if (VerifyBitField(Loc, II, T, BitWidth)) { 5453 D.setInvalidType(); 5454 DeleteExpr(BitWidth); 5455 BitWidth = 0; 5456 } 5457 } else { 5458 // Not a bitfield. 5459 5460 // validate II. 5461 5462 } 5463 5464 // C99 6.7.2.1p8: A member of a structure or union may have any type other 5465 // than a variably modified type. 5466 if (T->isVariablyModifiedType()) { 5467 Diag(Loc, diag::err_typecheck_ivar_variable_size); 5468 D.setInvalidType(); 5469 } 5470 5471 // Get the visibility (access control) for this ivar. 5472 ObjCIvarDecl::AccessControl ac = 5473 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 5474 : ObjCIvarDecl::None; 5475 // Must set ivar's DeclContext to its enclosing interface. 5476 Decl *EnclosingDecl = IntfDecl.getAs<Decl>(); 5477 DeclContext *EnclosingContext; 5478 if (ObjCImplementationDecl *IMPDecl = 5479 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 5480 // Case of ivar declared in an implementation. Context is that of its class. 5481 ObjCInterfaceDecl* IDecl = IMPDecl->getClassInterface(); 5482 assert(IDecl && "No class- ActOnIvar"); 5483 EnclosingContext = cast_or_null<DeclContext>(IDecl); 5484 } else 5485 EnclosingContext = dyn_cast<DeclContext>(EnclosingDecl); 5486 assert(EnclosingContext && "null DeclContext for ivar - ActOnIvar"); 5487 5488 // Construct the decl. 5489 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, 5490 EnclosingContext, Loc, II, T, 5491 TInfo, ac, (Expr *)BitfieldWidth); 5492 5493 if (II) { 5494 NamedDecl *PrevDecl = LookupSingleName(S, II, LookupMemberName, 5495 ForRedeclaration); 5496 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S) 5497 && !isa<TagDecl>(PrevDecl)) { 5498 Diag(Loc, diag::err_duplicate_member) << II; 5499 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 5500 NewID->setInvalidDecl(); 5501 } 5502 } 5503 5504 // Process attributes attached to the ivar. 5505 ProcessDeclAttributes(S, NewID, D); 5506 5507 if (D.isInvalidType()) 5508 NewID->setInvalidDecl(); 5509 5510 if (II) { 5511 // FIXME: When interfaces are DeclContexts, we'll need to add 5512 // these to the interface. 5513 S->AddDecl(DeclPtrTy::make(NewID)); 5514 IdResolver.AddDecl(NewID); 5515 } 5516 5517 return DeclPtrTy::make(NewID); 5518} 5519 5520void Sema::ActOnFields(Scope* S, 5521 SourceLocation RecLoc, DeclPtrTy RecDecl, 5522 DeclPtrTy *Fields, unsigned NumFields, 5523 SourceLocation LBrac, SourceLocation RBrac, 5524 AttributeList *Attr) { 5525 Decl *EnclosingDecl = RecDecl.getAs<Decl>(); 5526 assert(EnclosingDecl && "missing record or interface decl"); 5527 5528 // If the decl this is being inserted into is invalid, then it may be a 5529 // redeclaration or some other bogus case. Don't try to add fields to it. 5530 if (EnclosingDecl->isInvalidDecl()) { 5531 // FIXME: Deallocate fields? 5532 return; 5533 } 5534 5535 5536 // Verify that all the fields are okay. 5537 unsigned NumNamedMembers = 0; 5538 llvm::SmallVector<FieldDecl*, 32> RecFields; 5539 5540 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 5541 for (unsigned i = 0; i != NumFields; ++i) { 5542 FieldDecl *FD = cast<FieldDecl>(Fields[i].getAs<Decl>()); 5543 5544 // Get the type for the field. 5545 Type *FDTy = FD->getType().getTypePtr(); 5546 5547 if (!FD->isAnonymousStructOrUnion()) { 5548 // Remember all fields written by the user. 5549 RecFields.push_back(FD); 5550 } 5551 5552 // If the field is already invalid for some reason, don't emit more 5553 // diagnostics about it. 5554 if (FD->isInvalidDecl()) { 5555 EnclosingDecl->setInvalidDecl(); 5556 continue; 5557 } 5558 5559 // C99 6.7.2.1p2: 5560 // A structure or union shall not contain a member with 5561 // incomplete or function type (hence, a structure shall not 5562 // contain an instance of itself, but may contain a pointer to 5563 // an instance of itself), except that the last member of a 5564 // structure with more than one named member may have incomplete 5565 // array type; such a structure (and any union containing, 5566 // possibly recursively, a member that is such a structure) 5567 // shall not be a member of a structure or an element of an 5568 // array. 5569 if (FDTy->isFunctionType()) { 5570 // Field declared as a function. 5571 Diag(FD->getLocation(), diag::err_field_declared_as_function) 5572 << FD->getDeclName(); 5573 FD->setInvalidDecl(); 5574 EnclosingDecl->setInvalidDecl(); 5575 continue; 5576 } else if (FDTy->isIncompleteArrayType() && i == NumFields - 1 && 5577 Record && Record->isStruct()) { 5578 // Flexible array member. 5579 if (NumNamedMembers < 1) { 5580 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 5581 << FD->getDeclName(); 5582 FD->setInvalidDecl(); 5583 EnclosingDecl->setInvalidDecl(); 5584 continue; 5585 } 5586 // Okay, we have a legal flexible array member at the end of the struct. 5587 if (Record) 5588 Record->setHasFlexibleArrayMember(true); 5589 } else if (!FDTy->isDependentType() && 5590 RequireCompleteType(FD->getLocation(), FD->getType(), 5591 diag::err_field_incomplete)) { 5592 // Incomplete type 5593 FD->setInvalidDecl(); 5594 EnclosingDecl->setInvalidDecl(); 5595 continue; 5596 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) { 5597 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 5598 // If this is a member of a union, then entire union becomes "flexible". 5599 if (Record && Record->isUnion()) { 5600 Record->setHasFlexibleArrayMember(true); 5601 } else { 5602 // If this is a struct/class and this is not the last element, reject 5603 // it. Note that GCC supports variable sized arrays in the middle of 5604 // structures. 5605 if (i != NumFields-1) 5606 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 5607 << FD->getDeclName() << FD->getType(); 5608 else { 5609 // We support flexible arrays at the end of structs in 5610 // other structs as an extension. 5611 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 5612 << FD->getDeclName(); 5613 if (Record) 5614 Record->setHasFlexibleArrayMember(true); 5615 } 5616 } 5617 } 5618 if (Record && FDTTy->getDecl()->hasObjectMember()) 5619 Record->setHasObjectMember(true); 5620 } else if (FDTy->isObjCInterfaceType()) { 5621 /// A field cannot be an Objective-c object 5622 Diag(FD->getLocation(), diag::err_statically_allocated_object); 5623 FD->setInvalidDecl(); 5624 EnclosingDecl->setInvalidDecl(); 5625 continue; 5626 } else if (getLangOptions().ObjC1 && 5627 getLangOptions().getGCMode() != LangOptions::NonGC && 5628 Record && 5629 (FD->getType()->isObjCObjectPointerType() || 5630 FD->getType().isObjCGCStrong())) 5631 Record->setHasObjectMember(true); 5632 // Keep track of the number of named members. 5633 if (FD->getIdentifier()) 5634 ++NumNamedMembers; 5635 } 5636 5637 // Okay, we successfully defined 'Record'. 5638 if (Record) { 5639 Record->completeDefinition(); 5640 } else { 5641 ObjCIvarDecl **ClsFields = 5642 reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); 5643 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 5644 ID->setIVarList(ClsFields, RecFields.size(), Context); 5645 ID->setLocEnd(RBrac); 5646 // Add ivar's to class's DeclContext. 5647 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 5648 ClsFields[i]->setLexicalDeclContext(ID); 5649 ID->addDecl(ClsFields[i]); 5650 } 5651 // Must enforce the rule that ivars in the base classes may not be 5652 // duplicates. 5653 if (ID->getSuperClass()) { 5654 for (ObjCInterfaceDecl::ivar_iterator IVI = ID->ivar_begin(), 5655 IVE = ID->ivar_end(); IVI != IVE; ++IVI) { 5656 ObjCIvarDecl* Ivar = (*IVI); 5657 5658 if (IdentifierInfo *II = Ivar->getIdentifier()) { 5659 ObjCIvarDecl* prevIvar = 5660 ID->getSuperClass()->lookupInstanceVariable(II); 5661 if (prevIvar) { 5662 Diag(Ivar->getLocation(), diag::err_duplicate_member) << II; 5663 Diag(prevIvar->getLocation(), diag::note_previous_declaration); 5664 } 5665 } 5666 } 5667 } 5668 } else if (ObjCImplementationDecl *IMPDecl = 5669 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 5670 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 5671 for (unsigned I = 0, N = RecFields.size(); I != N; ++I) 5672 // Ivar declared in @implementation never belongs to the implementation. 5673 // Only it is in implementation's lexical context. 5674 ClsFields[I]->setLexicalDeclContext(IMPDecl); 5675 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 5676 } 5677 } 5678 5679 if (Attr) 5680 ProcessDeclAttributeList(S, Record, Attr); 5681} 5682 5683/// \brief Determine whether the given integral value is representable within 5684/// the given type T. 5685static bool isRepresentableIntegerValue(ASTContext &Context, 5686 llvm::APSInt &Value, 5687 QualType T) { 5688 assert(T->isIntegralType() && "Integral type required!"); 5689 unsigned BitWidth = Context.getTypeSize(T); 5690 5691 if (Value.isUnsigned() || Value.isNonNegative()) 5692 return Value.getActiveBits() < BitWidth; 5693 5694 return Value.getMinSignedBits() <= BitWidth; 5695} 5696 5697// \brief Given an integral type, return the next larger integral type 5698// (or a NULL type of no such type exists). 5699static QualType getNextLargerIntegralType(ASTContext &Context, QualType T) { 5700 // FIXME: Int128/UInt128 support, which also needs to be introduced into 5701 // enum checking below. 5702 assert(T->isIntegralType() && "Integral type required!"); 5703 const unsigned NumTypes = 4; 5704 QualType SignedIntegralTypes[NumTypes] = { 5705 Context.ShortTy, Context.IntTy, Context.LongTy, Context.LongLongTy 5706 }; 5707 QualType UnsignedIntegralTypes[NumTypes] = { 5708 Context.UnsignedShortTy, Context.UnsignedIntTy, Context.UnsignedLongTy, 5709 Context.UnsignedLongLongTy 5710 }; 5711 5712 unsigned BitWidth = Context.getTypeSize(T); 5713 QualType *Types = T->isSignedIntegerType()? SignedIntegralTypes 5714 : UnsignedIntegralTypes; 5715 for (unsigned I = 0; I != NumTypes; ++I) 5716 if (Context.getTypeSize(Types[I]) > BitWidth) 5717 return Types[I]; 5718 5719 return QualType(); 5720} 5721 5722EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 5723 EnumConstantDecl *LastEnumConst, 5724 SourceLocation IdLoc, 5725 IdentifierInfo *Id, 5726 ExprArg val) { 5727 Expr *Val = (Expr *)val.get(); 5728 5729 unsigned IntWidth = Context.Target.getIntWidth(); 5730 llvm::APSInt EnumVal(IntWidth); 5731 QualType EltTy; 5732 if (Val) { 5733 if (Enum->isDependentType()) 5734 EltTy = Context.DependentTy; 5735 else { 5736 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 5737 SourceLocation ExpLoc; 5738 if (VerifyIntegerConstantExpression(Val, &EnumVal)) { 5739 Val = 0; 5740 } else { 5741 if (!getLangOptions().CPlusPlus) { 5742 // C99 6.7.2.2p2: 5743 // The expression that defines the value of an enumeration constant 5744 // shall be an integer constant expression that has a value 5745 // representable as an int. 5746 5747 // Complain if the value is not representable in an int. 5748 if (!isRepresentableIntegerValue(Context, EnumVal, Context.IntTy)) 5749 Diag(IdLoc, diag::ext_enum_value_not_int) 5750 << EnumVal.toString(10) << Val->getSourceRange() 5751 << (EnumVal.isUnsigned() || EnumVal.isNonNegative()); 5752 else if (!Context.hasSameType(Val->getType(), Context.IntTy)) { 5753 // Force the type of the expression to 'int'. 5754 ImpCastExprToType(Val, Context.IntTy, CastExpr::CK_IntegralCast); 5755 5756 if (Val != val.get()) { 5757 val.release(); 5758 val = Val; 5759 } 5760 } 5761 } 5762 5763 // C++0x [dcl.enum]p5: 5764 // If the underlying type is not fixed, the type of each enumerator 5765 // is the type of its initializing value: 5766 // - If an initializer is specified for an enumerator, the 5767 // initializing value has the same type as the expression. 5768 EltTy = Val->getType(); 5769 } 5770 } 5771 } 5772 5773 if (!Val) { 5774 if (Enum->isDependentType()) 5775 EltTy = Context.DependentTy; 5776 else if (!LastEnumConst) { 5777 // C++0x [dcl.enum]p5: 5778 // If the underlying type is not fixed, the type of each enumerator 5779 // is the type of its initializing value: 5780 // - If no initializer is specified for the first enumerator, the 5781 // initializing value has an unspecified integral type. 5782 // 5783 // GCC uses 'int' for its unspecified integral type, as does 5784 // C99 6.7.2.2p3. 5785 EltTy = Context.IntTy; 5786 } else { 5787 // Assign the last value + 1. 5788 EnumVal = LastEnumConst->getInitVal(); 5789 ++EnumVal; 5790 EltTy = LastEnumConst->getType(); 5791 5792 // Check for overflow on increment. 5793 if (EnumVal < LastEnumConst->getInitVal()) { 5794 // C++0x [dcl.enum]p5: 5795 // If the underlying type is not fixed, the type of each enumerator 5796 // is the type of its initializing value: 5797 // 5798 // - Otherwise the type of the initializing value is the same as 5799 // the type of the initializing value of the preceding enumerator 5800 // unless the incremented value is not representable in that type, 5801 // in which case the type is an unspecified integral type 5802 // sufficient to contain the incremented value. If no such type 5803 // exists, the program is ill-formed. 5804 QualType T = getNextLargerIntegralType(Context, EltTy); 5805 if (T.isNull()) { 5806 // There is no integral type larger enough to represent this 5807 // value. Complain, then allow the value to wrap around. 5808 EnumVal = LastEnumConst->getInitVal(); 5809 EnumVal.zext(EnumVal.getBitWidth() * 2); 5810 Diag(IdLoc, diag::warn_enumerator_too_large) 5811 << EnumVal.toString(10); 5812 } else { 5813 EltTy = T; 5814 } 5815 5816 // Retrieve the last enumerator's value, extent that type to the 5817 // type that is supposed to be large enough to represent the incremented 5818 // value, then increment. 5819 EnumVal = LastEnumConst->getInitVal(); 5820 EnumVal.setIsSigned(EltTy->isSignedIntegerType()); 5821 EnumVal.zextOrTrunc(Context.getTypeSize(EltTy)); 5822 ++EnumVal; 5823 5824 // If we're not in C++, diagnose the overflow of enumerator values, 5825 // which in C99 means that the enumerator value is not representable in 5826 // an int (C99 6.7.2.2p2). However, we support GCC's extension that 5827 // permits enumerator values that are representable in some larger 5828 // integral type. 5829 if (!getLangOptions().CPlusPlus && !T.isNull()) 5830 Diag(IdLoc, diag::warn_enum_value_overflow); 5831 } else if (!getLangOptions().CPlusPlus && 5832 !isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 5833 // Enforce C99 6.7.2.2p2 even when we compute the next value. 5834 Diag(IdLoc, diag::ext_enum_value_not_int) 5835 << EnumVal.toString(10) << 1; 5836 } 5837 } 5838 } 5839 5840 if (!Enum->isDependentType()) { 5841 // Make the enumerator value match the signedness and size of the 5842 // enumerator's type. 5843 EnumVal.zextOrTrunc(Context.getTypeSize(EltTy)); 5844 EnumVal.setIsSigned(EltTy->isSignedIntegerType()); 5845 } 5846 5847 val.release(); 5848 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 5849 Val, EnumVal); 5850} 5851 5852 5853Sema::DeclPtrTy Sema::ActOnEnumConstant(Scope *S, DeclPtrTy theEnumDecl, 5854 DeclPtrTy lastEnumConst, 5855 SourceLocation IdLoc, 5856 IdentifierInfo *Id, 5857 SourceLocation EqualLoc, ExprTy *val) { 5858 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl.getAs<Decl>()); 5859 EnumConstantDecl *LastEnumConst = 5860 cast_or_null<EnumConstantDecl>(lastEnumConst.getAs<Decl>()); 5861 Expr *Val = static_cast<Expr*>(val); 5862 5863 // The scope passed in may not be a decl scope. Zip up the scope tree until 5864 // we find one that is. 5865 S = getNonFieldDeclScope(S); 5866 5867 // Verify that there isn't already something declared with this name in this 5868 // scope. 5869 NamedDecl *PrevDecl = LookupSingleName(S, Id, LookupOrdinaryName, 5870 ForRedeclaration); 5871 if (PrevDecl && PrevDecl->isTemplateParameter()) { 5872 // Maybe we will complain about the shadowed template parameter. 5873 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 5874 // Just pretend that we didn't see the previous declaration. 5875 PrevDecl = 0; 5876 } 5877 5878 if (PrevDecl) { 5879 // When in C++, we may get a TagDecl with the same name; in this case the 5880 // enum constant will 'hide' the tag. 5881 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 5882 "Received TagDecl when not in C++!"); 5883 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 5884 if (isa<EnumConstantDecl>(PrevDecl)) 5885 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 5886 else 5887 Diag(IdLoc, diag::err_redefinition) << Id; 5888 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5889 if (Val) Val->Destroy(Context); 5890 return DeclPtrTy(); 5891 } 5892 } 5893 5894 EnumConstantDecl *New = CheckEnumConstant(TheEnumDecl, LastEnumConst, 5895 IdLoc, Id, Owned(Val)); 5896 5897 // Register this decl in the current scope stack. 5898 if (New) { 5899 New->setAccess(TheEnumDecl->getAccess()); 5900 PushOnScopeChains(New, S); 5901 } 5902 5903 return DeclPtrTy::make(New); 5904} 5905 5906void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc, 5907 SourceLocation RBraceLoc, DeclPtrTy EnumDeclX, 5908 DeclPtrTy *Elements, unsigned NumElements, 5909 Scope *S, AttributeList *Attr) { 5910 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX.getAs<Decl>()); 5911 QualType EnumType = Context.getTypeDeclType(Enum); 5912 5913 if (Attr) 5914 ProcessDeclAttributeList(S, Enum, Attr); 5915 5916 if (Enum->isDependentType()) { 5917 for (unsigned i = 0; i != NumElements; ++i) { 5918 EnumConstantDecl *ECD = 5919 cast_or_null<EnumConstantDecl>(Elements[i].getAs<Decl>()); 5920 if (!ECD) continue; 5921 5922 ECD->setType(EnumType); 5923 } 5924 5925 Enum->completeDefinition(Context.DependentTy, Context.DependentTy); 5926 return; 5927 } 5928 5929 // TODO: If the result value doesn't fit in an int, it must be a long or long 5930 // long value. ISO C does not support this, but GCC does as an extension, 5931 // emit a warning. 5932 unsigned IntWidth = Context.Target.getIntWidth(); 5933 unsigned CharWidth = Context.Target.getCharWidth(); 5934 unsigned ShortWidth = Context.Target.getShortWidth(); 5935 5936 // Verify that all the values are okay, compute the size of the values, and 5937 // reverse the list. 5938 unsigned NumNegativeBits = 0; 5939 unsigned NumPositiveBits = 0; 5940 5941 // Keep track of whether all elements have type int. 5942 bool AllElementsInt = true; 5943 5944 for (unsigned i = 0; i != NumElements; ++i) { 5945 EnumConstantDecl *ECD = 5946 cast_or_null<EnumConstantDecl>(Elements[i].getAs<Decl>()); 5947 if (!ECD) continue; // Already issued a diagnostic. 5948 5949 const llvm::APSInt &InitVal = ECD->getInitVal(); 5950 5951 // Keep track of the size of positive and negative values. 5952 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 5953 NumPositiveBits = std::max(NumPositiveBits, 5954 (unsigned)InitVal.getActiveBits()); 5955 else 5956 NumNegativeBits = std::max(NumNegativeBits, 5957 (unsigned)InitVal.getMinSignedBits()); 5958 5959 // Keep track of whether every enum element has type int (very commmon). 5960 if (AllElementsInt) 5961 AllElementsInt = ECD->getType() == Context.IntTy; 5962 } 5963 5964 // Figure out the type that should be used for this enum. 5965 // FIXME: Support -fshort-enums. 5966 QualType BestType; 5967 unsigned BestWidth; 5968 5969 // C++0x N3000 [conv.prom]p3: 5970 // An rvalue of an unscoped enumeration type whose underlying 5971 // type is not fixed can be converted to an rvalue of the first 5972 // of the following types that can represent all the values of 5973 // the enumeration: int, unsigned int, long int, unsigned long 5974 // int, long long int, or unsigned long long int. 5975 // C99 6.4.4.3p2: 5976 // An identifier declared as an enumeration constant has type int. 5977 // The C99 rule is modified by a gcc extension 5978 QualType BestPromotionType; 5979 5980 bool Packed = Enum->getAttr<PackedAttr>() ? true : false; 5981 5982 if (NumNegativeBits) { 5983 // If there is a negative value, figure out the smallest integer type (of 5984 // int/long/longlong) that fits. 5985 // If it's packed, check also if it fits a char or a short. 5986 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) { 5987 BestType = Context.SignedCharTy; 5988 BestWidth = CharWidth; 5989 } else if (Packed && NumNegativeBits <= ShortWidth && 5990 NumPositiveBits < ShortWidth) { 5991 BestType = Context.ShortTy; 5992 BestWidth = ShortWidth; 5993 } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 5994 BestType = Context.IntTy; 5995 BestWidth = IntWidth; 5996 } else { 5997 BestWidth = Context.Target.getLongWidth(); 5998 5999 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) { 6000 BestType = Context.LongTy; 6001 } else { 6002 BestWidth = Context.Target.getLongLongWidth(); 6003 6004 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 6005 Diag(Enum->getLocation(), diag::warn_enum_too_large); 6006 BestType = Context.LongLongTy; 6007 } 6008 } 6009 BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType); 6010 } else { 6011 // If there is no negative value, figure out the smallest type that fits 6012 // all of the enumerator values. 6013 // If it's packed, check also if it fits a char or a short. 6014 if (Packed && NumPositiveBits <= CharWidth) { 6015 BestType = Context.UnsignedCharTy; 6016 BestPromotionType = Context.IntTy; 6017 BestWidth = CharWidth; 6018 } else if (Packed && NumPositiveBits <= ShortWidth) { 6019 BestType = Context.UnsignedShortTy; 6020 BestPromotionType = Context.IntTy; 6021 BestWidth = ShortWidth; 6022 } else if (NumPositiveBits <= IntWidth) { 6023 BestType = Context.UnsignedIntTy; 6024 BestWidth = IntWidth; 6025 BestPromotionType 6026 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 6027 ? Context.UnsignedIntTy : Context.IntTy; 6028 } else if (NumPositiveBits <= 6029 (BestWidth = Context.Target.getLongWidth())) { 6030 BestType = Context.UnsignedLongTy; 6031 BestPromotionType 6032 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 6033 ? Context.UnsignedLongTy : Context.LongTy; 6034 } else { 6035 BestWidth = Context.Target.getLongLongWidth(); 6036 assert(NumPositiveBits <= BestWidth && 6037 "How could an initializer get larger than ULL?"); 6038 BestType = Context.UnsignedLongLongTy; 6039 BestPromotionType 6040 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 6041 ? Context.UnsignedLongLongTy : Context.LongLongTy; 6042 } 6043 } 6044 6045 // Loop over all of the enumerator constants, changing their types to match 6046 // the type of the enum if needed. 6047 for (unsigned i = 0; i != NumElements; ++i) { 6048 EnumConstantDecl *ECD = 6049 cast_or_null<EnumConstantDecl>(Elements[i].getAs<Decl>()); 6050 if (!ECD) continue; // Already issued a diagnostic. 6051 6052 // Standard C says the enumerators have int type, but we allow, as an 6053 // extension, the enumerators to be larger than int size. If each 6054 // enumerator value fits in an int, type it as an int, otherwise type it the 6055 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 6056 // that X has type 'int', not 'unsigned'. 6057 6058 // Determine whether the value fits into an int. 6059 llvm::APSInt InitVal = ECD->getInitVal(); 6060 6061 // If it fits into an integer type, force it. Otherwise force it to match 6062 // the enum decl type. 6063 QualType NewTy; 6064 unsigned NewWidth; 6065 bool NewSign; 6066 if (!getLangOptions().CPlusPlus && 6067 isRepresentableIntegerValue(Context, InitVal, Context.IntTy)) { 6068 NewTy = Context.IntTy; 6069 NewWidth = IntWidth; 6070 NewSign = true; 6071 } else if (ECD->getType() == BestType) { 6072 // Already the right type! 6073 if (getLangOptions().CPlusPlus) 6074 // C++ [dcl.enum]p4: Following the closing brace of an 6075 // enum-specifier, each enumerator has the type of its 6076 // enumeration. 6077 ECD->setType(EnumType); 6078 continue; 6079 } else { 6080 NewTy = BestType; 6081 NewWidth = BestWidth; 6082 NewSign = BestType->isSignedIntegerType(); 6083 } 6084 6085 // Adjust the APSInt value. 6086 InitVal.extOrTrunc(NewWidth); 6087 InitVal.setIsSigned(NewSign); 6088 ECD->setInitVal(InitVal); 6089 6090 // Adjust the Expr initializer and type. 6091 if (ECD->getInitExpr()) 6092 ECD->setInitExpr(new (Context) ImplicitCastExpr(NewTy, 6093 CastExpr::CK_IntegralCast, 6094 ECD->getInitExpr(), 6095 /*isLvalue=*/false)); 6096 if (getLangOptions().CPlusPlus) 6097 // C++ [dcl.enum]p4: Following the closing brace of an 6098 // enum-specifier, each enumerator has the type of its 6099 // enumeration. 6100 ECD->setType(EnumType); 6101 else 6102 ECD->setType(NewTy); 6103 } 6104 6105 Enum->completeDefinition(BestType, BestPromotionType); 6106} 6107 6108Sema::DeclPtrTy Sema::ActOnFileScopeAsmDecl(SourceLocation Loc, 6109 ExprArg expr) { 6110 StringLiteral *AsmString = cast<StringLiteral>(expr.takeAs<Expr>()); 6111 6112 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext, 6113 Loc, AsmString); 6114 CurContext->addDecl(New); 6115 return DeclPtrTy::make(New); 6116} 6117 6118void Sema::ActOnPragmaWeakID(IdentifierInfo* Name, 6119 SourceLocation PragmaLoc, 6120 SourceLocation NameLoc) { 6121 Decl *PrevDecl = LookupSingleName(TUScope, Name, LookupOrdinaryName); 6122 6123 if (PrevDecl) { 6124 PrevDecl->addAttr(::new (Context) WeakAttr()); 6125 } else { 6126 (void)WeakUndeclaredIdentifiers.insert( 6127 std::pair<IdentifierInfo*,WeakInfo> 6128 (Name, WeakInfo((IdentifierInfo*)0, NameLoc))); 6129 } 6130} 6131 6132void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name, 6133 IdentifierInfo* AliasName, 6134 SourceLocation PragmaLoc, 6135 SourceLocation NameLoc, 6136 SourceLocation AliasNameLoc) { 6137 Decl *PrevDecl = LookupSingleName(TUScope, AliasName, LookupOrdinaryName); 6138 WeakInfo W = WeakInfo(Name, NameLoc); 6139 6140 if (PrevDecl) { 6141 if (!PrevDecl->hasAttr<AliasAttr>()) 6142 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl)) 6143 DeclApplyPragmaWeak(TUScope, ND, W); 6144 } else { 6145 (void)WeakUndeclaredIdentifiers.insert( 6146 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W)); 6147 } 6148} 6149