SemaDecl.cpp revision 4f6ca3423ddfeb60333d25b3b09151d4245771cb
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 if (T.isNull()) 192 T = Context.getTypeDeclType(TD); 193 194 if (SS) 195 T = getQualifiedNameType(*SS, T); 196 197 } else if (ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(IIDecl)) { 198 T = Context.getObjCInterfaceType(IDecl); 199 } else if (UnresolvedUsingTypenameDecl *UUDecl = 200 dyn_cast<UnresolvedUsingTypenameDecl>(IIDecl)) { 201 // FIXME: preserve source structure information. 202 T = Context.getTypenameType(UUDecl->getTargetNestedNameSpecifier(), &II); 203 } else { 204 // If it's not plausibly a type, suppress diagnostics. 205 Result.suppressDiagnostics(); 206 return 0; 207 } 208 209 return T.getAsOpaquePtr(); 210} 211 212/// isTagName() - This method is called *for error recovery purposes only* 213/// to determine if the specified name is a valid tag name ("struct foo"). If 214/// so, this returns the TST for the tag corresponding to it (TST_enum, 215/// TST_union, TST_struct, TST_class). This is used to diagnose cases in C 216/// where the user forgot to specify the tag. 217DeclSpec::TST Sema::isTagName(IdentifierInfo &II, Scope *S) { 218 // Do a tag name lookup in this scope. 219 LookupResult R(*this, &II, SourceLocation(), LookupTagName); 220 LookupName(R, S, false); 221 R.suppressDiagnostics(); 222 if (R.getResultKind() == LookupResult::Found) 223 if (const TagDecl *TD = R.getAsSingle<TagDecl>()) { 224 switch (TD->getTagKind()) { 225 case TagDecl::TK_struct: return DeclSpec::TST_struct; 226 case TagDecl::TK_union: return DeclSpec::TST_union; 227 case TagDecl::TK_class: return DeclSpec::TST_class; 228 case TagDecl::TK_enum: return DeclSpec::TST_enum; 229 } 230 } 231 232 return DeclSpec::TST_unspecified; 233} 234 235bool Sema::DiagnoseUnknownTypeName(const IdentifierInfo &II, 236 SourceLocation IILoc, 237 Scope *S, 238 const CXXScopeSpec *SS, 239 TypeTy *&SuggestedType) { 240 // We don't have anything to suggest (yet). 241 SuggestedType = 0; 242 243 // There may have been a typo in the name of the type. Look up typo 244 // results, in case we have something that we can suggest. 245 LookupResult Lookup(*this, &II, IILoc, LookupOrdinaryName, 246 NotForRedeclaration); 247 248 // FIXME: It would be nice if we could correct for typos in built-in 249 // names, such as "itn" for "int". 250 251 if (CorrectTypo(Lookup, S, SS) && Lookup.isSingleResult()) { 252 NamedDecl *Result = Lookup.getAsSingle<NamedDecl>(); 253 if ((isa<TypeDecl>(Result) || isa<ObjCInterfaceDecl>(Result)) && 254 !Result->isInvalidDecl()) { 255 // We found a similarly-named type or interface; suggest that. 256 if (!SS || !SS->isSet()) 257 Diag(IILoc, diag::err_unknown_typename_suggest) 258 << &II << Lookup.getLookupName() 259 << CodeModificationHint::CreateReplacement(SourceRange(IILoc), 260 Result->getNameAsString()); 261 else if (DeclContext *DC = computeDeclContext(*SS, false)) 262 Diag(IILoc, diag::err_unknown_nested_typename_suggest) 263 << &II << DC << Lookup.getLookupName() << SS->getRange() 264 << CodeModificationHint::CreateReplacement(SourceRange(IILoc), 265 Result->getNameAsString()); 266 else 267 llvm_unreachable("could not have corrected a typo here"); 268 269 Diag(Result->getLocation(), diag::note_previous_decl) 270 << Result->getDeclName(); 271 272 SuggestedType = getTypeName(*Result->getIdentifier(), IILoc, S, SS); 273 return true; 274 } 275 } 276 277 // FIXME: Should we move the logic that tries to recover from a missing tag 278 // (struct, union, enum) from Parser::ParseImplicitInt here, instead? 279 280 if (!SS || (!SS->isSet() && !SS->isInvalid())) 281 Diag(IILoc, diag::err_unknown_typename) << &II; 282 else if (DeclContext *DC = computeDeclContext(*SS, false)) 283 Diag(IILoc, diag::err_typename_nested_not_found) 284 << &II << DC << SS->getRange(); 285 else if (isDependentScopeSpecifier(*SS)) { 286 Diag(SS->getRange().getBegin(), diag::err_typename_missing) 287 << (NestedNameSpecifier *)SS->getScopeRep() << II.getName() 288 << SourceRange(SS->getRange().getBegin(), IILoc) 289 << CodeModificationHint::CreateInsertion(SS->getRange().getBegin(), 290 "typename "); 291 SuggestedType = ActOnTypenameType(SourceLocation(), *SS, II, IILoc).get(); 292 } else { 293 assert(SS && SS->isInvalid() && 294 "Invalid scope specifier has already been diagnosed"); 295 } 296 297 return true; 298} 299 300// Determines the context to return to after temporarily entering a 301// context. This depends in an unnecessarily complicated way on the 302// exact ordering of callbacks from the parser. 303DeclContext *Sema::getContainingDC(DeclContext *DC) { 304 305 // Functions defined inline within classes aren't parsed until we've 306 // finished parsing the top-level class, so the top-level class is 307 // the context we'll need to return to. 308 if (isa<FunctionDecl>(DC)) { 309 DC = DC->getLexicalParent(); 310 311 // A function not defined within a class will always return to its 312 // lexical context. 313 if (!isa<CXXRecordDecl>(DC)) 314 return DC; 315 316 // A C++ inline method/friend is parsed *after* the topmost class 317 // it was declared in is fully parsed ("complete"); the topmost 318 // class is the context we need to return to. 319 while (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC->getLexicalParent())) 320 DC = RD; 321 322 // Return the declaration context of the topmost class the inline method is 323 // declared in. 324 return DC; 325 } 326 327 if (isa<ObjCMethodDecl>(DC)) 328 return Context.getTranslationUnitDecl(); 329 330 return DC->getLexicalParent(); 331} 332 333void Sema::PushDeclContext(Scope *S, DeclContext *DC) { 334 assert(getContainingDC(DC) == CurContext && 335 "The next DeclContext should be lexically contained in the current one."); 336 CurContext = DC; 337 S->setEntity(DC); 338} 339 340void Sema::PopDeclContext() { 341 assert(CurContext && "DeclContext imbalance!"); 342 343 CurContext = getContainingDC(CurContext); 344} 345 346/// EnterDeclaratorContext - Used when we must lookup names in the context 347/// of a declarator's nested name specifier. 348/// 349void Sema::EnterDeclaratorContext(Scope *S, DeclContext *DC) { 350 // C++0x [basic.lookup.unqual]p13: 351 // A name used in the definition of a static data member of class 352 // X (after the qualified-id of the static member) is looked up as 353 // if the name was used in a member function of X. 354 // C++0x [basic.lookup.unqual]p14: 355 // If a variable member of a namespace is defined outside of the 356 // scope of its namespace then any name used in the definition of 357 // the variable member (after the declarator-id) is looked up as 358 // if the definition of the variable member occurred in its 359 // namespace. 360 // Both of these imply that we should push a scope whose context 361 // is the semantic context of the declaration. We can't use 362 // PushDeclContext here because that context is not necessarily 363 // lexically contained in the current context. Fortunately, 364 // the containing scope should have the appropriate information. 365 366 assert(!S->getEntity() && "scope already has entity"); 367 368#ifndef NDEBUG 369 Scope *Ancestor = S->getParent(); 370 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 371 assert(Ancestor->getEntity() == CurContext && "ancestor context mismatch"); 372#endif 373 374 CurContext = DC; 375 S->setEntity(DC); 376} 377 378void Sema::ExitDeclaratorContext(Scope *S) { 379 assert(S->getEntity() == CurContext && "Context imbalance!"); 380 381 // Switch back to the lexical context. The safety of this is 382 // enforced by an assert in EnterDeclaratorContext. 383 Scope *Ancestor = S->getParent(); 384 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 385 CurContext = (DeclContext*) Ancestor->getEntity(); 386 387 // We don't need to do anything with the scope, which is going to 388 // disappear. 389} 390 391/// \brief Determine whether we allow overloading of the function 392/// PrevDecl with another declaration. 393/// 394/// This routine determines whether overloading is possible, not 395/// whether some new function is actually an overload. It will return 396/// true in C++ (where we can always provide overloads) or, as an 397/// extension, in C when the previous function is already an 398/// overloaded function declaration or has the "overloadable" 399/// attribute. 400static bool AllowOverloadingOfFunction(LookupResult &Previous, 401 ASTContext &Context) { 402 if (Context.getLangOptions().CPlusPlus) 403 return true; 404 405 if (Previous.getResultKind() == LookupResult::FoundOverloaded) 406 return true; 407 408 return (Previous.getResultKind() == LookupResult::Found 409 && Previous.getFoundDecl()->hasAttr<OverloadableAttr>()); 410} 411 412/// Add this decl to the scope shadowed decl chains. 413void Sema::PushOnScopeChains(NamedDecl *D, Scope *S, bool AddToContext) { 414 // Move up the scope chain until we find the nearest enclosing 415 // non-transparent context. The declaration will be introduced into this 416 // scope. 417 while (S->getEntity() && 418 ((DeclContext *)S->getEntity())->isTransparentContext()) 419 S = S->getParent(); 420 421 // Add scoped declarations into their context, so that they can be 422 // found later. Declarations without a context won't be inserted 423 // into any context. 424 if (AddToContext) 425 CurContext->addDecl(D); 426 427 // Out-of-line definitions shouldn't be pushed into scope in C++. 428 // Out-of-line variable and function definitions shouldn't even in C. 429 if ((getLangOptions().CPlusPlus || isa<VarDecl>(D) || isa<FunctionDecl>(D)) && 430 D->isOutOfLine()) 431 return; 432 433 // Template instantiations should also not be pushed into scope. 434 if (isa<FunctionDecl>(D) && 435 cast<FunctionDecl>(D)->isFunctionTemplateSpecialization()) 436 return; 437 438 // If this replaces anything in the current scope, 439 IdentifierResolver::iterator I = IdResolver.begin(D->getDeclName()), 440 IEnd = IdResolver.end(); 441 for (; I != IEnd; ++I) { 442 if (S->isDeclScope(DeclPtrTy::make(*I)) && D->declarationReplaces(*I)) { 443 S->RemoveDecl(DeclPtrTy::make(*I)); 444 IdResolver.RemoveDecl(*I); 445 446 // Should only need to replace one decl. 447 break; 448 } 449 } 450 451 S->AddDecl(DeclPtrTy::make(D)); 452 IdResolver.AddDecl(D); 453} 454 455bool Sema::isDeclInScope(NamedDecl *&D, DeclContext *Ctx, Scope *S) { 456 return IdResolver.isDeclInScope(D, Ctx, Context, S); 457} 458 459static bool isOutOfScopePreviousDeclaration(NamedDecl *, 460 DeclContext*, 461 ASTContext&); 462 463/// Filters out lookup results that don't fall within the given scope 464/// as determined by isDeclInScope. 465static void FilterLookupForScope(Sema &SemaRef, LookupResult &R, 466 DeclContext *Ctx, Scope *S, 467 bool ConsiderLinkage) { 468 LookupResult::Filter F = R.makeFilter(); 469 while (F.hasNext()) { 470 NamedDecl *D = F.next(); 471 472 if (SemaRef.isDeclInScope(D, Ctx, S)) 473 continue; 474 475 if (ConsiderLinkage && 476 isOutOfScopePreviousDeclaration(D, Ctx, SemaRef.Context)) 477 continue; 478 479 F.erase(); 480 } 481 482 F.done(); 483} 484 485static bool isUsingDecl(NamedDecl *D) { 486 return isa<UsingShadowDecl>(D) || 487 isa<UnresolvedUsingTypenameDecl>(D) || 488 isa<UnresolvedUsingValueDecl>(D); 489} 490 491/// Removes using shadow declarations from the lookup results. 492static void RemoveUsingDecls(LookupResult &R) { 493 LookupResult::Filter F = R.makeFilter(); 494 while (F.hasNext()) 495 if (isUsingDecl(F.next())) 496 F.erase(); 497 498 F.done(); 499} 500 501static bool ShouldDiagnoseUnusedDecl(const NamedDecl *D) { 502 if (D->isInvalidDecl()) 503 return false; 504 505 if (D->isUsed() || D->hasAttr<UnusedAttr>()) 506 return false; 507 508 // White-list anything that isn't a local variable. 509 if (!isa<VarDecl>(D) || isa<ParmVarDecl>(D) || isa<ImplicitParamDecl>(D) || 510 !D->getDeclContext()->isFunctionOrMethod()) 511 return false; 512 513 // Types of valid local variables should be complete, so this should succeed. 514 if (const ValueDecl *VD = dyn_cast<ValueDecl>(D)) { 515 if (const RecordType *RT = VD->getType()->getAs<RecordType>()) { 516 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(RT->getDecl())) { 517 if (!RD->hasTrivialConstructor()) 518 return false; 519 if (!RD->hasTrivialDestructor()) 520 return false; 521 } 522 } 523 } 524 525 return true; 526} 527 528void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) { 529 if (S->decl_empty()) return; 530 assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) && 531 "Scope shouldn't contain decls!"); 532 533 for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end(); 534 I != E; ++I) { 535 Decl *TmpD = (*I).getAs<Decl>(); 536 assert(TmpD && "This decl didn't get pushed??"); 537 538 assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?"); 539 NamedDecl *D = cast<NamedDecl>(TmpD); 540 541 if (!D->getDeclName()) continue; 542 543 // Diagnose unused variables in this scope. 544 if (ShouldDiagnoseUnusedDecl(D) && 545 S->getNumErrorsAtStart() == getDiagnostics().getNumErrors()) 546 Diag(D->getLocation(), diag::warn_unused_variable) << D->getDeclName(); 547 548 // Remove this name from our lexical scope. 549 IdResolver.RemoveDecl(D); 550 } 551} 552 553/// getObjCInterfaceDecl - Look up a for a class declaration in the scope. 554/// return 0 if one not found. 555/// 556/// \param Id the name of the Objective-C class we're looking for. If 557/// typo-correction fixes this name, the Id will be updated 558/// to the fixed name. 559/// 560/// \param RecoverLoc if provided, this routine will attempt to 561/// recover from a typo in the name of an existing Objective-C class 562/// and, if successful, will return the lookup that results from 563/// typo-correction. 564ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *&Id, 565 SourceLocation RecoverLoc) { 566 // The third "scope" argument is 0 since we aren't enabling lazy built-in 567 // creation from this context. 568 NamedDecl *IDecl = LookupSingleName(TUScope, Id, LookupOrdinaryName); 569 570 if (!IDecl && !RecoverLoc.isInvalid()) { 571 // Perform typo correction at the given location, but only if we 572 // find an Objective-C class name. 573 LookupResult R(*this, Id, RecoverLoc, LookupOrdinaryName); 574 if (CorrectTypo(R, TUScope, 0) && 575 (IDecl = R.getAsSingle<ObjCInterfaceDecl>())) { 576 Diag(RecoverLoc, diag::err_undef_interface_suggest) 577 << Id << IDecl->getDeclName() 578 << CodeModificationHint::CreateReplacement(RecoverLoc, 579 IDecl->getNameAsString()); 580 Diag(IDecl->getLocation(), diag::note_previous_decl) 581 << IDecl->getDeclName(); 582 583 Id = IDecl->getIdentifier(); 584 } 585 } 586 587 return dyn_cast_or_null<ObjCInterfaceDecl>(IDecl); 588} 589 590/// getNonFieldDeclScope - Retrieves the innermost scope, starting 591/// from S, where a non-field would be declared. This routine copes 592/// with the difference between C and C++ scoping rules in structs and 593/// unions. For example, the following code is well-formed in C but 594/// ill-formed in C++: 595/// @code 596/// struct S6 { 597/// enum { BAR } e; 598/// }; 599/// 600/// void test_S6() { 601/// struct S6 a; 602/// a.e = BAR; 603/// } 604/// @endcode 605/// For the declaration of BAR, this routine will return a different 606/// scope. The scope S will be the scope of the unnamed enumeration 607/// within S6. In C++, this routine will return the scope associated 608/// with S6, because the enumeration's scope is a transparent 609/// context but structures can contain non-field names. In C, this 610/// routine will return the translation unit scope, since the 611/// enumeration's scope is a transparent context and structures cannot 612/// contain non-field names. 613Scope *Sema::getNonFieldDeclScope(Scope *S) { 614 while (((S->getFlags() & Scope::DeclScope) == 0) || 615 (S->getEntity() && 616 ((DeclContext *)S->getEntity())->isTransparentContext()) || 617 (S->isClassScope() && !getLangOptions().CPlusPlus)) 618 S = S->getParent(); 619 return S; 620} 621 622void Sema::InitBuiltinVaListType() { 623 if (!Context.getBuiltinVaListType().isNull()) 624 return; 625 626 IdentifierInfo *VaIdent = &Context.Idents.get("__builtin_va_list"); 627 NamedDecl *VaDecl = LookupSingleName(TUScope, VaIdent, LookupOrdinaryName); 628 TypedefDecl *VaTypedef = cast<TypedefDecl>(VaDecl); 629 Context.setBuiltinVaListType(Context.getTypedefType(VaTypedef)); 630} 631 632/// LazilyCreateBuiltin - The specified Builtin-ID was first used at 633/// file scope. lazily create a decl for it. ForRedeclaration is true 634/// if we're creating this built-in in anticipation of redeclaring the 635/// built-in. 636NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid, 637 Scope *S, bool ForRedeclaration, 638 SourceLocation Loc) { 639 Builtin::ID BID = (Builtin::ID)bid; 640 641 if (Context.BuiltinInfo.hasVAListUse(BID)) 642 InitBuiltinVaListType(); 643 644 ASTContext::GetBuiltinTypeError Error; 645 QualType R = Context.GetBuiltinType(BID, Error); 646 switch (Error) { 647 case ASTContext::GE_None: 648 // Okay 649 break; 650 651 case ASTContext::GE_Missing_stdio: 652 if (ForRedeclaration) 653 Diag(Loc, diag::err_implicit_decl_requires_stdio) 654 << Context.BuiltinInfo.GetName(BID); 655 return 0; 656 657 case ASTContext::GE_Missing_setjmp: 658 if (ForRedeclaration) 659 Diag(Loc, diag::err_implicit_decl_requires_setjmp) 660 << Context.BuiltinInfo.GetName(BID); 661 return 0; 662 } 663 664 if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) { 665 Diag(Loc, diag::ext_implicit_lib_function_decl) 666 << Context.BuiltinInfo.GetName(BID) 667 << R; 668 if (Context.BuiltinInfo.getHeaderName(BID) && 669 Diags.getDiagnosticLevel(diag::ext_implicit_lib_function_decl) 670 != Diagnostic::Ignored) 671 Diag(Loc, diag::note_please_include_header) 672 << Context.BuiltinInfo.getHeaderName(BID) 673 << Context.BuiltinInfo.GetName(BID); 674 } 675 676 FunctionDecl *New = FunctionDecl::Create(Context, 677 Context.getTranslationUnitDecl(), 678 Loc, II, R, /*TInfo=*/0, 679 FunctionDecl::Extern, false, 680 /*hasPrototype=*/true); 681 New->setImplicit(); 682 683 // Create Decl objects for each parameter, adding them to the 684 // FunctionDecl. 685 if (FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) { 686 llvm::SmallVector<ParmVarDecl*, 16> Params; 687 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) 688 Params.push_back(ParmVarDecl::Create(Context, New, SourceLocation(), 0, 689 FT->getArgType(i), /*TInfo=*/0, 690 VarDecl::None, 0)); 691 New->setParams(Params.data(), Params.size()); 692 } 693 694 AddKnownFunctionAttributes(New); 695 696 // TUScope is the translation-unit scope to insert this function into. 697 // FIXME: This is hideous. We need to teach PushOnScopeChains to 698 // relate Scopes to DeclContexts, and probably eliminate CurContext 699 // entirely, but we're not there yet. 700 DeclContext *SavedContext = CurContext; 701 CurContext = Context.getTranslationUnitDecl(); 702 PushOnScopeChains(New, TUScope); 703 CurContext = SavedContext; 704 return New; 705} 706 707/// MergeTypeDefDecl - We just parsed a typedef 'New' which has the 708/// same name and scope as a previous declaration 'Old'. Figure out 709/// how to resolve this situation, merging decls or emitting 710/// diagnostics as appropriate. If there was an error, set New to be invalid. 711/// 712void Sema::MergeTypeDefDecl(TypedefDecl *New, LookupResult &OldDecls) { 713 // If the new decl is known invalid already, don't bother doing any 714 // merging checks. 715 if (New->isInvalidDecl()) return; 716 717 // Allow multiple definitions for ObjC built-in typedefs. 718 // FIXME: Verify the underlying types are equivalent! 719 if (getLangOptions().ObjC1) { 720 const IdentifierInfo *TypeID = New->getIdentifier(); 721 switch (TypeID->getLength()) { 722 default: break; 723 case 2: 724 if (!TypeID->isStr("id")) 725 break; 726 Context.ObjCIdRedefinitionType = New->getUnderlyingType(); 727 // Install the built-in type for 'id', ignoring the current definition. 728 New->setTypeForDecl(Context.getObjCIdType().getTypePtr()); 729 return; 730 case 5: 731 if (!TypeID->isStr("Class")) 732 break; 733 Context.ObjCClassRedefinitionType = New->getUnderlyingType(); 734 // Install the built-in type for 'Class', ignoring the current definition. 735 New->setTypeForDecl(Context.getObjCClassType().getTypePtr()); 736 return; 737 case 3: 738 if (!TypeID->isStr("SEL")) 739 break; 740 Context.ObjCSelRedefinitionType = New->getUnderlyingType(); 741 // Install the built-in type for 'SEL', ignoring the current definition. 742 New->setTypeForDecl(Context.getObjCSelType().getTypePtr()); 743 return; 744 case 8: 745 if (!TypeID->isStr("Protocol")) 746 break; 747 Context.setObjCProtoType(New->getUnderlyingType()); 748 return; 749 } 750 // Fall through - the typedef name was not a builtin type. 751 } 752 753 // Verify the old decl was also a type. 754 TypeDecl *Old = OldDecls.getAsSingle<TypeDecl>(); 755 if (!Old) { 756 Diag(New->getLocation(), diag::err_redefinition_different_kind) 757 << New->getDeclName(); 758 759 NamedDecl *OldD = OldDecls.getRepresentativeDecl(); 760 if (OldD->getLocation().isValid()) 761 Diag(OldD->getLocation(), diag::note_previous_definition); 762 763 return New->setInvalidDecl(); 764 } 765 766 // If the old declaration is invalid, just give up here. 767 if (Old->isInvalidDecl()) 768 return New->setInvalidDecl(); 769 770 // Determine the "old" type we'll use for checking and diagnostics. 771 QualType OldType; 772 if (TypedefDecl *OldTypedef = dyn_cast<TypedefDecl>(Old)) 773 OldType = OldTypedef->getUnderlyingType(); 774 else 775 OldType = Context.getTypeDeclType(Old); 776 777 // If the typedef types are not identical, reject them in all languages and 778 // with any extensions enabled. 779 780 if (OldType != New->getUnderlyingType() && 781 Context.getCanonicalType(OldType) != 782 Context.getCanonicalType(New->getUnderlyingType())) { 783 Diag(New->getLocation(), diag::err_redefinition_different_typedef) 784 << New->getUnderlyingType() << OldType; 785 if (Old->getLocation().isValid()) 786 Diag(Old->getLocation(), diag::note_previous_definition); 787 return New->setInvalidDecl(); 788 } 789 790 // The types match. Link up the redeclaration chain if the old 791 // declaration was a typedef. 792 // FIXME: this is a potential source of wierdness if the type 793 // spellings don't match exactly. 794 if (isa<TypedefDecl>(Old)) 795 New->setPreviousDeclaration(cast<TypedefDecl>(Old)); 796 797 if (getLangOptions().Microsoft) 798 return; 799 800 if (getLangOptions().CPlusPlus) { 801 // C++ [dcl.typedef]p2: 802 // In a given non-class scope, a typedef specifier can be used to 803 // redefine the name of any type declared in that scope to refer 804 // to the type to which it already refers. 805 if (!isa<CXXRecordDecl>(CurContext)) 806 return; 807 808 // C++0x [dcl.typedef]p4: 809 // In a given class scope, a typedef specifier can be used to redefine 810 // any class-name declared in that scope that is not also a typedef-name 811 // to refer to the type to which it already refers. 812 // 813 // This wording came in via DR424, which was a correction to the 814 // wording in DR56, which accidentally banned code like: 815 // 816 // struct S { 817 // typedef struct A { } A; 818 // }; 819 // 820 // in the C++03 standard. We implement the C++0x semantics, which 821 // allow the above but disallow 822 // 823 // struct S { 824 // typedef int I; 825 // typedef int I; 826 // }; 827 // 828 // since that was the intent of DR56. 829 if (!isa<TypedefDecl >(Old)) 830 return; 831 832 Diag(New->getLocation(), diag::err_redefinition) 833 << New->getDeclName(); 834 Diag(Old->getLocation(), diag::note_previous_definition); 835 return New->setInvalidDecl(); 836 } 837 838 // If we have a redefinition of a typedef in C, emit a warning. This warning 839 // is normally mapped to an error, but can be controlled with 840 // -Wtypedef-redefinition. If either the original or the redefinition is 841 // in a system header, don't emit this for compatibility with GCC. 842 if (getDiagnostics().getSuppressSystemWarnings() && 843 (Context.getSourceManager().isInSystemHeader(Old->getLocation()) || 844 Context.getSourceManager().isInSystemHeader(New->getLocation()))) 845 return; 846 847 Diag(New->getLocation(), diag::warn_redefinition_of_typedef) 848 << New->getDeclName(); 849 Diag(Old->getLocation(), diag::note_previous_definition); 850 return; 851} 852 853/// DeclhasAttr - returns true if decl Declaration already has the target 854/// attribute. 855static bool 856DeclHasAttr(const Decl *decl, const Attr *target) { 857 for (const Attr *attr = decl->getAttrs(); attr; attr = attr->getNext()) 858 if (attr->getKind() == target->getKind()) 859 return true; 860 861 return false; 862} 863 864/// MergeAttributes - append attributes from the Old decl to the New one. 865static void MergeAttributes(Decl *New, Decl *Old, ASTContext &C) { 866 for (const Attr *attr = Old->getAttrs(); attr; attr = attr->getNext()) { 867 if (!DeclHasAttr(New, attr) && attr->isMerged()) { 868 Attr *NewAttr = attr->clone(C); 869 NewAttr->setInherited(true); 870 New->addAttr(NewAttr); 871 } 872 } 873} 874 875/// Used in MergeFunctionDecl to keep track of function parameters in 876/// C. 877struct GNUCompatibleParamWarning { 878 ParmVarDecl *OldParm; 879 ParmVarDecl *NewParm; 880 QualType PromotedType; 881}; 882 883 884/// getSpecialMember - get the special member enum for a method. 885static Sema::CXXSpecialMember getSpecialMember(ASTContext &Ctx, 886 const CXXMethodDecl *MD) { 887 if (const CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(MD)) { 888 if (Ctor->isDefaultConstructor()) 889 return Sema::CXXDefaultConstructor; 890 if (Ctor->isCopyConstructor()) 891 return Sema::CXXCopyConstructor; 892 } 893 894 if (isa<CXXDestructorDecl>(MD)) 895 return Sema::CXXDestructor; 896 897 assert(MD->isCopyAssignment() && "Must have copy assignment operator"); 898 return Sema::CXXCopyAssignment; 899} 900 901/// canREdefineFunction - checks if a function can be redefined. Currently, 902/// only extern inline functions can be redefined, and even then only in 903/// GNU89 mode. 904static bool canRedefineFunction(const FunctionDecl *FD, 905 const LangOptions& LangOpts) { 906 return (LangOpts.GNUMode && !LangOpts.C99 && !LangOpts.CPlusPlus && 907 FD->isInlineSpecified() && 908 FD->getStorageClass() == FunctionDecl::Extern); 909} 910 911/// MergeFunctionDecl - We just parsed a function 'New' from 912/// declarator D which has the same name and scope as a previous 913/// declaration 'Old'. Figure out how to resolve this situation, 914/// merging decls or emitting diagnostics as appropriate. 915/// 916/// In C++, New and Old must be declarations that are not 917/// overloaded. Use IsOverload to determine whether New and Old are 918/// overloaded, and to select the Old declaration that New should be 919/// merged with. 920/// 921/// Returns true if there was an error, false otherwise. 922bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD) { 923 // Verify the old decl was also a function. 924 FunctionDecl *Old = 0; 925 if (FunctionTemplateDecl *OldFunctionTemplate 926 = dyn_cast<FunctionTemplateDecl>(OldD)) 927 Old = OldFunctionTemplate->getTemplatedDecl(); 928 else 929 Old = dyn_cast<FunctionDecl>(OldD); 930 if (!Old) { 931 if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(OldD)) { 932 Diag(New->getLocation(), diag::err_using_decl_conflict_reverse); 933 Diag(Shadow->getTargetDecl()->getLocation(), 934 diag::note_using_decl_target); 935 Diag(Shadow->getUsingDecl()->getLocation(), 936 diag::note_using_decl) << 0; 937 return true; 938 } 939 940 Diag(New->getLocation(), diag::err_redefinition_different_kind) 941 << New->getDeclName(); 942 Diag(OldD->getLocation(), diag::note_previous_definition); 943 return true; 944 } 945 946 // Determine whether the previous declaration was a definition, 947 // implicit declaration, or a declaration. 948 diag::kind PrevDiag; 949 if (Old->isThisDeclarationADefinition()) 950 PrevDiag = diag::note_previous_definition; 951 else if (Old->isImplicit()) 952 PrevDiag = diag::note_previous_implicit_declaration; 953 else 954 PrevDiag = diag::note_previous_declaration; 955 956 QualType OldQType = Context.getCanonicalType(Old->getType()); 957 QualType NewQType = Context.getCanonicalType(New->getType()); 958 959 // Don't complain about this if we're in GNU89 mode and the old function 960 // is an extern inline function. 961 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) && 962 New->getStorageClass() == FunctionDecl::Static && 963 Old->getStorageClass() != FunctionDecl::Static && 964 !canRedefineFunction(Old, getLangOptions())) { 965 Diag(New->getLocation(), diag::err_static_non_static) 966 << New; 967 Diag(Old->getLocation(), PrevDiag); 968 return true; 969 } 970 971 // If a function is first declared with a calling convention, but is 972 // later declared or defined without one, the second decl assumes the 973 // calling convention of the first. 974 // 975 // For the new decl, we have to look at the NON-canonical type to tell the 976 // difference between a function that really doesn't have a calling 977 // convention and one that is declared cdecl. That's because in 978 // canonicalization (see ASTContext.cpp), cdecl is canonicalized away 979 // because it is the default calling convention. 980 // 981 // Note also that we DO NOT return at this point, because we still have 982 // other tests to run. 983 const FunctionType *OldType = OldQType->getAs<FunctionType>(); 984 const FunctionType *NewType = New->getType()->getAs<FunctionType>(); 985 if (OldType->getCallConv() != CC_Default && 986 NewType->getCallConv() == CC_Default) { 987 NewQType = Context.getCallConvType(NewQType, OldType->getCallConv()); 988 New->setType(NewQType); 989 NewQType = Context.getCanonicalType(NewQType); 990 } else if (!Context.isSameCallConv(OldType->getCallConv(), 991 NewType->getCallConv())) { 992 // Calling conventions really aren't compatible, so complain. 993 Diag(New->getLocation(), diag::err_cconv_change) 994 << FunctionType::getNameForCallConv(NewType->getCallConv()) 995 << (OldType->getCallConv() == CC_Default) 996 << (OldType->getCallConv() == CC_Default ? "" : 997 FunctionType::getNameForCallConv(OldType->getCallConv())); 998 Diag(Old->getLocation(), diag::note_previous_declaration); 999 return true; 1000 } 1001 1002 // FIXME: diagnose the other way around? 1003 if (OldType->getNoReturnAttr() && !NewType->getNoReturnAttr()) { 1004 NewQType = Context.getNoReturnType(NewQType); 1005 New->setType(NewQType); 1006 assert(NewQType.isCanonical()); 1007 } 1008 1009 if (getLangOptions().CPlusPlus) { 1010 // (C++98 13.1p2): 1011 // Certain function declarations cannot be overloaded: 1012 // -- Function declarations that differ only in the return type 1013 // cannot be overloaded. 1014 QualType OldReturnType 1015 = cast<FunctionType>(OldQType.getTypePtr())->getResultType(); 1016 QualType NewReturnType 1017 = cast<FunctionType>(NewQType.getTypePtr())->getResultType(); 1018 if (OldReturnType != NewReturnType) { 1019 Diag(New->getLocation(), diag::err_ovl_diff_return_type); 1020 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1021 return true; 1022 } 1023 1024 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 1025 const CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 1026 if (OldMethod && NewMethod) { 1027 if (!NewMethod->getFriendObjectKind() && 1028 NewMethod->getLexicalDeclContext()->isRecord()) { 1029 // -- Member function declarations with the same name and the 1030 // same parameter types cannot be overloaded if any of them 1031 // is a static member function declaration. 1032 if (OldMethod->isStatic() || NewMethod->isStatic()) { 1033 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 1034 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1035 return true; 1036 } 1037 1038 // C++ [class.mem]p1: 1039 // [...] A member shall not be declared twice in the 1040 // member-specification, except that a nested class or member 1041 // class template can be declared and then later defined. 1042 unsigned NewDiag; 1043 if (isa<CXXConstructorDecl>(OldMethod)) 1044 NewDiag = diag::err_constructor_redeclared; 1045 else if (isa<CXXDestructorDecl>(NewMethod)) 1046 NewDiag = diag::err_destructor_redeclared; 1047 else if (isa<CXXConversionDecl>(NewMethod)) 1048 NewDiag = diag::err_conv_function_redeclared; 1049 else 1050 NewDiag = diag::err_member_redeclared; 1051 1052 Diag(New->getLocation(), NewDiag); 1053 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1054 } else { 1055 if (OldMethod->isImplicit()) { 1056 Diag(NewMethod->getLocation(), 1057 diag::err_definition_of_implicitly_declared_member) 1058 << New << getSpecialMember(Context, OldMethod); 1059 1060 Diag(OldMethod->getLocation(), 1061 diag::note_previous_implicit_declaration); 1062 return true; 1063 } 1064 } 1065 } 1066 1067 // (C++98 8.3.5p3): 1068 // All declarations for a function shall agree exactly in both the 1069 // return type and the parameter-type-list. 1070 // attributes should be ignored when comparing. 1071 if (Context.getNoReturnType(OldQType, false) == 1072 Context.getNoReturnType(NewQType, false)) 1073 return MergeCompatibleFunctionDecls(New, Old); 1074 1075 // Fall through for conflicting redeclarations and redefinitions. 1076 } 1077 1078 // C: Function types need to be compatible, not identical. This handles 1079 // duplicate function decls like "void f(int); void f(enum X);" properly. 1080 if (!getLangOptions().CPlusPlus && 1081 Context.typesAreCompatible(OldQType, NewQType)) { 1082 const FunctionType *OldFuncType = OldQType->getAs<FunctionType>(); 1083 const FunctionType *NewFuncType = NewQType->getAs<FunctionType>(); 1084 const FunctionProtoType *OldProto = 0; 1085 if (isa<FunctionNoProtoType>(NewFuncType) && 1086 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) { 1087 // The old declaration provided a function prototype, but the 1088 // new declaration does not. Merge in the prototype. 1089 assert(!OldProto->hasExceptionSpec() && "Exception spec in C"); 1090 llvm::SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(), 1091 OldProto->arg_type_end()); 1092 NewQType = Context.getFunctionType(NewFuncType->getResultType(), 1093 ParamTypes.data(), ParamTypes.size(), 1094 OldProto->isVariadic(), 1095 OldProto->getTypeQuals(), 1096 false, false, 0, 0, 1097 OldProto->getNoReturnAttr(), 1098 OldProto->getCallConv()); 1099 New->setType(NewQType); 1100 New->setHasInheritedPrototype(); 1101 1102 // Synthesize a parameter for each argument type. 1103 llvm::SmallVector<ParmVarDecl*, 16> Params; 1104 for (FunctionProtoType::arg_type_iterator 1105 ParamType = OldProto->arg_type_begin(), 1106 ParamEnd = OldProto->arg_type_end(); 1107 ParamType != ParamEnd; ++ParamType) { 1108 ParmVarDecl *Param = ParmVarDecl::Create(Context, New, 1109 SourceLocation(), 0, 1110 *ParamType, /*TInfo=*/0, 1111 VarDecl::None, 0); 1112 Param->setImplicit(); 1113 Params.push_back(Param); 1114 } 1115 1116 New->setParams(Params.data(), Params.size()); 1117 } 1118 1119 return MergeCompatibleFunctionDecls(New, Old); 1120 } 1121 1122 // GNU C permits a K&R definition to follow a prototype declaration 1123 // if the declared types of the parameters in the K&R definition 1124 // match the types in the prototype declaration, even when the 1125 // promoted types of the parameters from the K&R definition differ 1126 // from the types in the prototype. GCC then keeps the types from 1127 // the prototype. 1128 // 1129 // If a variadic prototype is followed by a non-variadic K&R definition, 1130 // the K&R definition becomes variadic. This is sort of an edge case, but 1131 // it's legal per the standard depending on how you read C99 6.7.5.3p15 and 1132 // C99 6.9.1p8. 1133 if (!getLangOptions().CPlusPlus && 1134 Old->hasPrototype() && !New->hasPrototype() && 1135 New->getType()->getAs<FunctionProtoType>() && 1136 Old->getNumParams() == New->getNumParams()) { 1137 llvm::SmallVector<QualType, 16> ArgTypes; 1138 llvm::SmallVector<GNUCompatibleParamWarning, 16> Warnings; 1139 const FunctionProtoType *OldProto 1140 = Old->getType()->getAs<FunctionProtoType>(); 1141 const FunctionProtoType *NewProto 1142 = New->getType()->getAs<FunctionProtoType>(); 1143 1144 // Determine whether this is the GNU C extension. 1145 QualType MergedReturn = Context.mergeTypes(OldProto->getResultType(), 1146 NewProto->getResultType()); 1147 bool LooseCompatible = !MergedReturn.isNull(); 1148 for (unsigned Idx = 0, End = Old->getNumParams(); 1149 LooseCompatible && Idx != End; ++Idx) { 1150 ParmVarDecl *OldParm = Old->getParamDecl(Idx); 1151 ParmVarDecl *NewParm = New->getParamDecl(Idx); 1152 if (Context.typesAreCompatible(OldParm->getType(), 1153 NewProto->getArgType(Idx))) { 1154 ArgTypes.push_back(NewParm->getType()); 1155 } else if (Context.typesAreCompatible(OldParm->getType(), 1156 NewParm->getType())) { 1157 GNUCompatibleParamWarning Warn 1158 = { OldParm, NewParm, NewProto->getArgType(Idx) }; 1159 Warnings.push_back(Warn); 1160 ArgTypes.push_back(NewParm->getType()); 1161 } else 1162 LooseCompatible = false; 1163 } 1164 1165 if (LooseCompatible) { 1166 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) { 1167 Diag(Warnings[Warn].NewParm->getLocation(), 1168 diag::ext_param_promoted_not_compatible_with_prototype) 1169 << Warnings[Warn].PromotedType 1170 << Warnings[Warn].OldParm->getType(); 1171 Diag(Warnings[Warn].OldParm->getLocation(), 1172 diag::note_previous_declaration); 1173 } 1174 1175 New->setType(Context.getFunctionType(MergedReturn, &ArgTypes[0], 1176 ArgTypes.size(), 1177 OldProto->isVariadic(), 0, 1178 false, false, 0, 0, 1179 OldProto->getNoReturnAttr(), 1180 OldProto->getCallConv())); 1181 return MergeCompatibleFunctionDecls(New, Old); 1182 } 1183 1184 // Fall through to diagnose conflicting types. 1185 } 1186 1187 // A function that has already been declared has been redeclared or defined 1188 // with a different type- show appropriate diagnostic 1189 if (unsigned BuiltinID = Old->getBuiltinID()) { 1190 // The user has declared a builtin function with an incompatible 1191 // signature. 1192 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 1193 // The function the user is redeclaring is a library-defined 1194 // function like 'malloc' or 'printf'. Warn about the 1195 // redeclaration, then pretend that we don't know about this 1196 // library built-in. 1197 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; 1198 Diag(Old->getLocation(), diag::note_previous_builtin_declaration) 1199 << Old << Old->getType(); 1200 New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin); 1201 Old->setInvalidDecl(); 1202 return false; 1203 } 1204 1205 PrevDiag = diag::note_previous_builtin_declaration; 1206 } 1207 1208 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 1209 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1210 return true; 1211} 1212 1213/// \brief Completes the merge of two function declarations that are 1214/// known to be compatible. 1215/// 1216/// This routine handles the merging of attributes and other 1217/// properties of function declarations form the old declaration to 1218/// the new declaration, once we know that New is in fact a 1219/// redeclaration of Old. 1220/// 1221/// \returns false 1222bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old) { 1223 // Merge the attributes 1224 MergeAttributes(New, Old, Context); 1225 1226 // Merge the storage class. 1227 if (Old->getStorageClass() != FunctionDecl::Extern && 1228 Old->getStorageClass() != FunctionDecl::None) 1229 New->setStorageClass(Old->getStorageClass()); 1230 1231 // Merge "pure" flag. 1232 if (Old->isPure()) 1233 New->setPure(); 1234 1235 // Merge the "deleted" flag. 1236 if (Old->isDeleted()) 1237 New->setDeleted(); 1238 1239 if (getLangOptions().CPlusPlus) 1240 return MergeCXXFunctionDecl(New, Old); 1241 1242 return false; 1243} 1244 1245/// MergeVarDecl - We just parsed a variable 'New' which has the same name 1246/// and scope as a previous declaration 'Old'. Figure out how to resolve this 1247/// situation, merging decls or emitting diagnostics as appropriate. 1248/// 1249/// Tentative definition rules (C99 6.9.2p2) are checked by 1250/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 1251/// definitions here, since the initializer hasn't been attached. 1252/// 1253void Sema::MergeVarDecl(VarDecl *New, LookupResult &Previous) { 1254 // If the new decl is already invalid, don't do any other checking. 1255 if (New->isInvalidDecl()) 1256 return; 1257 1258 // Verify the old decl was also a variable. 1259 VarDecl *Old = 0; 1260 if (!Previous.isSingleResult() || 1261 !(Old = dyn_cast<VarDecl>(Previous.getFoundDecl()))) { 1262 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1263 << New->getDeclName(); 1264 Diag(Previous.getRepresentativeDecl()->getLocation(), 1265 diag::note_previous_definition); 1266 return New->setInvalidDecl(); 1267 } 1268 1269 MergeAttributes(New, Old, Context); 1270 1271 // Merge the types 1272 QualType MergedT; 1273 if (getLangOptions().CPlusPlus) { 1274 if (Context.hasSameType(New->getType(), Old->getType())) 1275 MergedT = New->getType(); 1276 // C++ [basic.link]p10: 1277 // [...] the types specified by all declarations referring to a given 1278 // object or function shall be identical, except that declarations for an 1279 // array object can specify array types that differ by the presence or 1280 // absence of a major array bound (8.3.4). 1281 else if (Old->getType()->isIncompleteArrayType() && 1282 New->getType()->isArrayType()) { 1283 CanQual<ArrayType> OldArray 1284 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 1285 CanQual<ArrayType> NewArray 1286 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 1287 if (OldArray->getElementType() == NewArray->getElementType()) 1288 MergedT = New->getType(); 1289 } else if (Old->getType()->isArrayType() && 1290 New->getType()->isIncompleteArrayType()) { 1291 CanQual<ArrayType> OldArray 1292 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 1293 CanQual<ArrayType> NewArray 1294 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 1295 if (OldArray->getElementType() == NewArray->getElementType()) 1296 MergedT = Old->getType(); 1297 } 1298 } else { 1299 MergedT = Context.mergeTypes(New->getType(), Old->getType()); 1300 } 1301 if (MergedT.isNull()) { 1302 Diag(New->getLocation(), diag::err_redefinition_different_type) 1303 << New->getDeclName(); 1304 Diag(Old->getLocation(), diag::note_previous_definition); 1305 return New->setInvalidDecl(); 1306 } 1307 New->setType(MergedT); 1308 1309 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 1310 if (New->getStorageClass() == VarDecl::Static && 1311 (Old->getStorageClass() == VarDecl::None || Old->hasExternalStorage())) { 1312 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 1313 Diag(Old->getLocation(), diag::note_previous_definition); 1314 return New->setInvalidDecl(); 1315 } 1316 // C99 6.2.2p4: 1317 // For an identifier declared with the storage-class specifier 1318 // extern in a scope in which a prior declaration of that 1319 // identifier is visible,23) if the prior declaration specifies 1320 // internal or external linkage, the linkage of the identifier at 1321 // the later declaration is the same as the linkage specified at 1322 // the prior declaration. If no prior declaration is visible, or 1323 // if the prior declaration specifies no linkage, then the 1324 // identifier has external linkage. 1325 if (New->hasExternalStorage() && Old->hasLinkage()) 1326 /* Okay */; 1327 else if (New->getStorageClass() != VarDecl::Static && 1328 Old->getStorageClass() == VarDecl::Static) { 1329 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 1330 Diag(Old->getLocation(), diag::note_previous_definition); 1331 return New->setInvalidDecl(); 1332 } 1333 1334 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 1335 1336 // FIXME: The test for external storage here seems wrong? We still 1337 // need to check for mismatches. 1338 if (!New->hasExternalStorage() && !New->isFileVarDecl() && 1339 // Don't complain about out-of-line definitions of static members. 1340 !(Old->getLexicalDeclContext()->isRecord() && 1341 !New->getLexicalDeclContext()->isRecord())) { 1342 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 1343 Diag(Old->getLocation(), diag::note_previous_definition); 1344 return New->setInvalidDecl(); 1345 } 1346 1347 if (New->isThreadSpecified() && !Old->isThreadSpecified()) { 1348 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName(); 1349 Diag(Old->getLocation(), diag::note_previous_definition); 1350 } else if (!New->isThreadSpecified() && Old->isThreadSpecified()) { 1351 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName(); 1352 Diag(Old->getLocation(), diag::note_previous_definition); 1353 } 1354 1355 // C++ doesn't have tentative definitions, so go right ahead and check here. 1356 const VarDecl *Def; 1357 if (getLangOptions().CPlusPlus && 1358 New->isThisDeclarationADefinition() == VarDecl::Definition && 1359 (Def = Old->getDefinition())) { 1360 Diag(New->getLocation(), diag::err_redefinition) 1361 << New->getDeclName(); 1362 Diag(Def->getLocation(), diag::note_previous_definition); 1363 New->setInvalidDecl(); 1364 return; 1365 } 1366 1367 // Keep a chain of previous declarations. 1368 New->setPreviousDeclaration(Old); 1369 1370 // Inherit access appropriately. 1371 New->setAccess(Old->getAccess()); 1372} 1373 1374/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 1375/// no declarator (e.g. "struct foo;") is parsed. 1376Sema::DeclPtrTy Sema::ParsedFreeStandingDeclSpec(Scope *S, DeclSpec &DS) { 1377 // FIXME: Error on auto/register at file scope 1378 // FIXME: Error on inline/virtual/explicit 1379 // FIXME: Warn on useless __thread 1380 // FIXME: Warn on useless const/volatile 1381 // FIXME: Warn on useless static/extern/typedef/private_extern/mutable 1382 // FIXME: Warn on useless attributes 1383 Decl *TagD = 0; 1384 TagDecl *Tag = 0; 1385 if (DS.getTypeSpecType() == DeclSpec::TST_class || 1386 DS.getTypeSpecType() == DeclSpec::TST_struct || 1387 DS.getTypeSpecType() == DeclSpec::TST_union || 1388 DS.getTypeSpecType() == DeclSpec::TST_enum) { 1389 TagD = static_cast<Decl *>(DS.getTypeRep()); 1390 1391 if (!TagD) // We probably had an error 1392 return DeclPtrTy(); 1393 1394 // Note that the above type specs guarantee that the 1395 // type rep is a Decl, whereas in many of the others 1396 // it's a Type. 1397 Tag = dyn_cast<TagDecl>(TagD); 1398 } 1399 1400 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 1401 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 1402 // or incomplete types shall not be restrict-qualified." 1403 if (TypeQuals & DeclSpec::TQ_restrict) 1404 Diag(DS.getRestrictSpecLoc(), 1405 diag::err_typecheck_invalid_restrict_not_pointer_noarg) 1406 << DS.getSourceRange(); 1407 } 1408 1409 if (DS.isFriendSpecified()) { 1410 // If we're dealing with a class template decl, assume that the 1411 // template routines are handling it. 1412 if (TagD && isa<ClassTemplateDecl>(TagD)) 1413 return DeclPtrTy(); 1414 return ActOnFriendTypeDecl(S, DS, MultiTemplateParamsArg(*this, 0, 0)); 1415 } 1416 1417 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 1418 // If there are attributes in the DeclSpec, apply them to the record. 1419 if (const AttributeList *AL = DS.getAttributes()) 1420 ProcessDeclAttributeList(S, Record, AL); 1421 1422 if (!Record->getDeclName() && Record->isDefinition() && 1423 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { 1424 if (getLangOptions().CPlusPlus || 1425 Record->getDeclContext()->isRecord()) 1426 return BuildAnonymousStructOrUnion(S, DS, Record); 1427 1428 Diag(DS.getSourceRange().getBegin(), diag::err_no_declarators) 1429 << DS.getSourceRange(); 1430 } 1431 1432 // Microsoft allows unnamed struct/union fields. Don't complain 1433 // about them. 1434 // FIXME: Should we support Microsoft's extensions in this area? 1435 if (Record->getDeclName() && getLangOptions().Microsoft) 1436 return DeclPtrTy::make(Tag); 1437 } 1438 1439 if (!DS.isMissingDeclaratorOk() && 1440 DS.getTypeSpecType() != DeclSpec::TST_error) { 1441 // Warn about typedefs of enums without names, since this is an 1442 // extension in both Microsoft an GNU. 1443 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 1444 Tag && isa<EnumDecl>(Tag)) { 1445 Diag(DS.getSourceRange().getBegin(), diag::ext_typedef_without_a_name) 1446 << DS.getSourceRange(); 1447 return DeclPtrTy::make(Tag); 1448 } 1449 1450 Diag(DS.getSourceRange().getBegin(), diag::err_no_declarators) 1451 << DS.getSourceRange(); 1452 return DeclPtrTy(); 1453 } 1454 1455 return DeclPtrTy::make(Tag); 1456} 1457 1458/// We are trying to inject an anonymous member into the given scope; 1459/// check if there's an existing declaration that can't be overloaded. 1460/// 1461/// \return true if this is a forbidden redeclaration 1462static bool CheckAnonMemberRedeclaration(Sema &SemaRef, 1463 Scope *S, 1464 DeclContext *Owner, 1465 DeclarationName Name, 1466 SourceLocation NameLoc, 1467 unsigned diagnostic) { 1468 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupMemberName, 1469 Sema::ForRedeclaration); 1470 if (!SemaRef.LookupName(R, S)) return false; 1471 1472 if (R.getAsSingle<TagDecl>()) 1473 return false; 1474 1475 // Pick a representative declaration. 1476 NamedDecl *PrevDecl = R.getRepresentativeDecl()->getUnderlyingDecl(); 1477 if (PrevDecl && Owner->isRecord()) { 1478 RecordDecl *Record = cast<RecordDecl>(Owner); 1479 if (!SemaRef.isDeclInScope(PrevDecl, Record, S)) 1480 return false; 1481 } 1482 1483 SemaRef.Diag(NameLoc, diagnostic) << Name; 1484 SemaRef.Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 1485 1486 return true; 1487} 1488 1489/// InjectAnonymousStructOrUnionMembers - Inject the members of the 1490/// anonymous struct or union AnonRecord into the owning context Owner 1491/// and scope S. This routine will be invoked just after we realize 1492/// that an unnamed union or struct is actually an anonymous union or 1493/// struct, e.g., 1494/// 1495/// @code 1496/// union { 1497/// int i; 1498/// float f; 1499/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 1500/// // f into the surrounding scope.x 1501/// @endcode 1502/// 1503/// This routine is recursive, injecting the names of nested anonymous 1504/// structs/unions into the owning context and scope as well. 1505bool Sema::InjectAnonymousStructOrUnionMembers(Scope *S, DeclContext *Owner, 1506 RecordDecl *AnonRecord) { 1507 unsigned diagKind 1508 = AnonRecord->isUnion() ? diag::err_anonymous_union_member_redecl 1509 : diag::err_anonymous_struct_member_redecl; 1510 1511 bool Invalid = false; 1512 for (RecordDecl::field_iterator F = AnonRecord->field_begin(), 1513 FEnd = AnonRecord->field_end(); 1514 F != FEnd; ++F) { 1515 if ((*F)->getDeclName()) { 1516 if (CheckAnonMemberRedeclaration(*this, S, Owner, (*F)->getDeclName(), 1517 (*F)->getLocation(), diagKind)) { 1518 // C++ [class.union]p2: 1519 // The names of the members of an anonymous union shall be 1520 // distinct from the names of any other entity in the 1521 // scope in which the anonymous union is declared. 1522 Invalid = true; 1523 } else { 1524 // C++ [class.union]p2: 1525 // For the purpose of name lookup, after the anonymous union 1526 // definition, the members of the anonymous union are 1527 // considered to have been defined in the scope in which the 1528 // anonymous union is declared. 1529 Owner->makeDeclVisibleInContext(*F); 1530 S->AddDecl(DeclPtrTy::make(*F)); 1531 IdResolver.AddDecl(*F); 1532 } 1533 } else if (const RecordType *InnerRecordType 1534 = (*F)->getType()->getAs<RecordType>()) { 1535 RecordDecl *InnerRecord = InnerRecordType->getDecl(); 1536 if (InnerRecord->isAnonymousStructOrUnion()) 1537 Invalid = Invalid || 1538 InjectAnonymousStructOrUnionMembers(S, Owner, InnerRecord); 1539 } 1540 } 1541 1542 return Invalid; 1543} 1544 1545/// ActOnAnonymousStructOrUnion - Handle the declaration of an 1546/// anonymous structure or union. Anonymous unions are a C++ feature 1547/// (C++ [class.union]) and a GNU C extension; anonymous structures 1548/// are a GNU C and GNU C++ extension. 1549Sema::DeclPtrTy Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 1550 RecordDecl *Record) { 1551 DeclContext *Owner = Record->getDeclContext(); 1552 1553 // Diagnose whether this anonymous struct/union is an extension. 1554 if (Record->isUnion() && !getLangOptions().CPlusPlus) 1555 Diag(Record->getLocation(), diag::ext_anonymous_union); 1556 else if (!Record->isUnion()) 1557 Diag(Record->getLocation(), diag::ext_anonymous_struct); 1558 1559 // C and C++ require different kinds of checks for anonymous 1560 // structs/unions. 1561 bool Invalid = false; 1562 if (getLangOptions().CPlusPlus) { 1563 const char* PrevSpec = 0; 1564 unsigned DiagID; 1565 // C++ [class.union]p3: 1566 // Anonymous unions declared in a named namespace or in the 1567 // global namespace shall be declared static. 1568 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 1569 (isa<TranslationUnitDecl>(Owner) || 1570 (isa<NamespaceDecl>(Owner) && 1571 cast<NamespaceDecl>(Owner)->getDeclName()))) { 1572 Diag(Record->getLocation(), diag::err_anonymous_union_not_static); 1573 Invalid = true; 1574 1575 // Recover by adding 'static'. 1576 DS.SetStorageClassSpec(DeclSpec::SCS_static, SourceLocation(), 1577 PrevSpec, DiagID); 1578 } 1579 // C++ [class.union]p3: 1580 // A storage class is not allowed in a declaration of an 1581 // anonymous union in a class scope. 1582 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 1583 isa<RecordDecl>(Owner)) { 1584 Diag(DS.getStorageClassSpecLoc(), 1585 diag::err_anonymous_union_with_storage_spec); 1586 Invalid = true; 1587 1588 // Recover by removing the storage specifier. 1589 DS.SetStorageClassSpec(DeclSpec::SCS_unspecified, SourceLocation(), 1590 PrevSpec, DiagID); 1591 } 1592 1593 // C++ [class.union]p2: 1594 // The member-specification of an anonymous union shall only 1595 // define non-static data members. [Note: nested types and 1596 // functions cannot be declared within an anonymous union. ] 1597 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 1598 MemEnd = Record->decls_end(); 1599 Mem != MemEnd; ++Mem) { 1600 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 1601 // C++ [class.union]p3: 1602 // An anonymous union shall not have private or protected 1603 // members (clause 11). 1604 if (FD->getAccess() == AS_protected || FD->getAccess() == AS_private) { 1605 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 1606 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 1607 Invalid = true; 1608 } 1609 } else if ((*Mem)->isImplicit()) { 1610 // Any implicit members are fine. 1611 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 1612 // This is a type that showed up in an 1613 // elaborated-type-specifier inside the anonymous struct or 1614 // union, but which actually declares a type outside of the 1615 // anonymous struct or union. It's okay. 1616 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 1617 if (!MemRecord->isAnonymousStructOrUnion() && 1618 MemRecord->getDeclName()) { 1619 // This is a nested type declaration. 1620 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 1621 << (int)Record->isUnion(); 1622 Invalid = true; 1623 } 1624 } else { 1625 // We have something that isn't a non-static data 1626 // member. Complain about it. 1627 unsigned DK = diag::err_anonymous_record_bad_member; 1628 if (isa<TypeDecl>(*Mem)) 1629 DK = diag::err_anonymous_record_with_type; 1630 else if (isa<FunctionDecl>(*Mem)) 1631 DK = diag::err_anonymous_record_with_function; 1632 else if (isa<VarDecl>(*Mem)) 1633 DK = diag::err_anonymous_record_with_static; 1634 Diag((*Mem)->getLocation(), DK) 1635 << (int)Record->isUnion(); 1636 Invalid = true; 1637 } 1638 } 1639 } 1640 1641 if (!Record->isUnion() && !Owner->isRecord()) { 1642 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 1643 << (int)getLangOptions().CPlusPlus; 1644 Invalid = true; 1645 } 1646 1647 // Mock up a declarator. 1648 Declarator Dc(DS, Declarator::TypeNameContext); 1649 TypeSourceInfo *TInfo = 0; 1650 GetTypeForDeclarator(Dc, S, &TInfo); 1651 assert(TInfo && "couldn't build declarator info for anonymous struct/union"); 1652 1653 // Create a declaration for this anonymous struct/union. 1654 NamedDecl *Anon = 0; 1655 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 1656 Anon = FieldDecl::Create(Context, OwningClass, Record->getLocation(), 1657 /*IdentifierInfo=*/0, 1658 Context.getTypeDeclType(Record), 1659 TInfo, 1660 /*BitWidth=*/0, /*Mutable=*/false); 1661 Anon->setAccess(AS_public); 1662 if (getLangOptions().CPlusPlus) 1663 FieldCollector->Add(cast<FieldDecl>(Anon)); 1664 } else { 1665 VarDecl::StorageClass SC; 1666 switch (DS.getStorageClassSpec()) { 1667 default: assert(0 && "Unknown storage class!"); 1668 case DeclSpec::SCS_unspecified: SC = VarDecl::None; break; 1669 case DeclSpec::SCS_extern: SC = VarDecl::Extern; break; 1670 case DeclSpec::SCS_static: SC = VarDecl::Static; break; 1671 case DeclSpec::SCS_auto: SC = VarDecl::Auto; break; 1672 case DeclSpec::SCS_register: SC = VarDecl::Register; break; 1673 case DeclSpec::SCS_private_extern: SC = VarDecl::PrivateExtern; break; 1674 case DeclSpec::SCS_mutable: 1675 // mutable can only appear on non-static class members, so it's always 1676 // an error here 1677 Diag(Record->getLocation(), diag::err_mutable_nonmember); 1678 Invalid = true; 1679 SC = VarDecl::None; 1680 break; 1681 } 1682 1683 Anon = VarDecl::Create(Context, Owner, Record->getLocation(), 1684 /*IdentifierInfo=*/0, 1685 Context.getTypeDeclType(Record), 1686 TInfo, 1687 SC); 1688 } 1689 Anon->setImplicit(); 1690 1691 // Add the anonymous struct/union object to the current 1692 // context. We'll be referencing this object when we refer to one of 1693 // its members. 1694 Owner->addDecl(Anon); 1695 1696 // Inject the members of the anonymous struct/union into the owning 1697 // context and into the identifier resolver chain for name lookup 1698 // purposes. 1699 if (InjectAnonymousStructOrUnionMembers(S, Owner, Record)) 1700 Invalid = true; 1701 1702 // Mark this as an anonymous struct/union type. Note that we do not 1703 // do this until after we have already checked and injected the 1704 // members of this anonymous struct/union type, because otherwise 1705 // the members could be injected twice: once by DeclContext when it 1706 // builds its lookup table, and once by 1707 // InjectAnonymousStructOrUnionMembers. 1708 Record->setAnonymousStructOrUnion(true); 1709 1710 if (Invalid) 1711 Anon->setInvalidDecl(); 1712 1713 return DeclPtrTy::make(Anon); 1714} 1715 1716 1717/// GetNameForDeclarator - Determine the full declaration name for the 1718/// given Declarator. 1719DeclarationName Sema::GetNameForDeclarator(Declarator &D) { 1720 return GetNameFromUnqualifiedId(D.getName()); 1721} 1722 1723/// \brief Retrieves the canonicalized name from a parsed unqualified-id. 1724DeclarationName Sema::GetNameFromUnqualifiedId(const UnqualifiedId &Name) { 1725 switch (Name.getKind()) { 1726 case UnqualifiedId::IK_Identifier: 1727 return DeclarationName(Name.Identifier); 1728 1729 case UnqualifiedId::IK_OperatorFunctionId: 1730 return Context.DeclarationNames.getCXXOperatorName( 1731 Name.OperatorFunctionId.Operator); 1732 1733 case UnqualifiedId::IK_LiteralOperatorId: 1734 return Context.DeclarationNames.getCXXLiteralOperatorName( 1735 Name.Identifier); 1736 1737 case UnqualifiedId::IK_ConversionFunctionId: { 1738 QualType Ty = GetTypeFromParser(Name.ConversionFunctionId); 1739 if (Ty.isNull()) 1740 return DeclarationName(); 1741 1742 return Context.DeclarationNames.getCXXConversionFunctionName( 1743 Context.getCanonicalType(Ty)); 1744 } 1745 1746 case UnqualifiedId::IK_ConstructorName: { 1747 QualType Ty = GetTypeFromParser(Name.ConstructorName); 1748 if (Ty.isNull()) 1749 return DeclarationName(); 1750 1751 return Context.DeclarationNames.getCXXConstructorName( 1752 Context.getCanonicalType(Ty)); 1753 } 1754 1755 case UnqualifiedId::IK_ConstructorTemplateId: { 1756 // In well-formed code, we can only have a constructor 1757 // template-id that refers to the current context, so go there 1758 // to find the actual type being constructed. 1759 CXXRecordDecl *CurClass = dyn_cast<CXXRecordDecl>(CurContext); 1760 if (!CurClass || CurClass->getIdentifier() != Name.TemplateId->Name) 1761 return DeclarationName(); 1762 1763 // Determine the type of the class being constructed. 1764 QualType CurClassType = Context.getTypeDeclType(CurClass); 1765 1766 // FIXME: Check two things: that the template-id names the same type as 1767 // CurClassType, and that the template-id does not occur when the name 1768 // was qualified. 1769 1770 return Context.DeclarationNames.getCXXConstructorName( 1771 Context.getCanonicalType(CurClassType)); 1772 } 1773 1774 case UnqualifiedId::IK_DestructorName: { 1775 QualType Ty = GetTypeFromParser(Name.DestructorName); 1776 if (Ty.isNull()) 1777 return DeclarationName(); 1778 1779 return Context.DeclarationNames.getCXXDestructorName( 1780 Context.getCanonicalType(Ty)); 1781 } 1782 1783 case UnqualifiedId::IK_TemplateId: { 1784 TemplateName TName 1785 = TemplateName::getFromVoidPointer(Name.TemplateId->Template); 1786 return Context.getNameForTemplate(TName); 1787 } 1788 } 1789 1790 assert(false && "Unknown name kind"); 1791 return DeclarationName(); 1792} 1793 1794/// isNearlyMatchingFunction - Determine whether the C++ functions 1795/// Declaration and Definition are "nearly" matching. This heuristic 1796/// is used to improve diagnostics in the case where an out-of-line 1797/// function definition doesn't match any declaration within 1798/// the class or namespace. 1799static bool isNearlyMatchingFunction(ASTContext &Context, 1800 FunctionDecl *Declaration, 1801 FunctionDecl *Definition) { 1802 if (Declaration->param_size() != Definition->param_size()) 1803 return false; 1804 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 1805 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 1806 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 1807 1808 if (!Context.hasSameUnqualifiedType(DeclParamTy.getNonReferenceType(), 1809 DefParamTy.getNonReferenceType())) 1810 return false; 1811 } 1812 1813 return true; 1814} 1815 1816Sema::DeclPtrTy 1817Sema::HandleDeclarator(Scope *S, Declarator &D, 1818 MultiTemplateParamsArg TemplateParamLists, 1819 bool IsFunctionDefinition) { 1820 DeclarationName Name = GetNameForDeclarator(D); 1821 1822 // All of these full declarators require an identifier. If it doesn't have 1823 // one, the ParsedFreeStandingDeclSpec action should be used. 1824 if (!Name) { 1825 if (!D.isInvalidType()) // Reject this if we think it is valid. 1826 Diag(D.getDeclSpec().getSourceRange().getBegin(), 1827 diag::err_declarator_need_ident) 1828 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 1829 return DeclPtrTy(); 1830 } 1831 1832 // The scope passed in may not be a decl scope. Zip up the scope tree until 1833 // we find one that is. 1834 while ((S->getFlags() & Scope::DeclScope) == 0 || 1835 (S->getFlags() & Scope::TemplateParamScope) != 0) 1836 S = S->getParent(); 1837 1838 // If this is an out-of-line definition of a member of a class template 1839 // or class template partial specialization, we may need to rebuild the 1840 // type specifier in the declarator. See RebuildTypeInCurrentInstantiation() 1841 // for more information. 1842 // FIXME: cope with decltype(expr) and typeof(expr) once the rebuilder can 1843 // handle expressions properly. 1844 DeclSpec &DS = const_cast<DeclSpec&>(D.getDeclSpec()); 1845 if (D.getCXXScopeSpec().isSet() && !D.getCXXScopeSpec().isInvalid() && 1846 isDependentScopeSpecifier(D.getCXXScopeSpec()) && 1847 (DS.getTypeSpecType() == DeclSpec::TST_typename || 1848 DS.getTypeSpecType() == DeclSpec::TST_typeofType || 1849 DS.getTypeSpecType() == DeclSpec::TST_typeofExpr || 1850 DS.getTypeSpecType() == DeclSpec::TST_decltype)) { 1851 if (DeclContext *DC = computeDeclContext(D.getCXXScopeSpec(), true)) { 1852 // FIXME: Preserve type source info. 1853 QualType T = GetTypeFromParser(DS.getTypeRep()); 1854 1855 DeclContext *SavedContext = CurContext; 1856 CurContext = DC; 1857 T = RebuildTypeInCurrentInstantiation(T, D.getIdentifierLoc(), Name); 1858 CurContext = SavedContext; 1859 1860 if (T.isNull()) 1861 return DeclPtrTy(); 1862 DS.UpdateTypeRep(T.getAsOpaquePtr()); 1863 } 1864 } 1865 1866 DeclContext *DC; 1867 NamedDecl *New; 1868 1869 TypeSourceInfo *TInfo = 0; 1870 QualType R = GetTypeForDeclarator(D, S, &TInfo); 1871 1872 LookupResult Previous(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 1873 ForRedeclaration); 1874 1875 // See if this is a redefinition of a variable in the same scope. 1876 if (D.getCXXScopeSpec().isInvalid()) { 1877 DC = CurContext; 1878 D.setInvalidType(); 1879 } else if (!D.getCXXScopeSpec().isSet()) { 1880 bool IsLinkageLookup = false; 1881 1882 // If the declaration we're planning to build will be a function 1883 // or object with linkage, then look for another declaration with 1884 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 1885 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 1886 /* Do nothing*/; 1887 else if (R->isFunctionType()) { 1888 if (CurContext->isFunctionOrMethod() || 1889 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 1890 IsLinkageLookup = true; 1891 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 1892 IsLinkageLookup = true; 1893 else if (CurContext->getLookupContext()->isTranslationUnit() && 1894 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 1895 IsLinkageLookup = true; 1896 1897 if (IsLinkageLookup) 1898 Previous.clear(LookupRedeclarationWithLinkage); 1899 1900 DC = CurContext; 1901 LookupName(Previous, S, /* CreateBuiltins = */ IsLinkageLookup); 1902 } else { // Something like "int foo::x;" 1903 DC = computeDeclContext(D.getCXXScopeSpec(), true); 1904 1905 if (!DC) { 1906 // If we could not compute the declaration context, it's because the 1907 // declaration context is dependent but does not refer to a class, 1908 // class template, or class template partial specialization. Complain 1909 // and return early, to avoid the coming semantic disaster. 1910 Diag(D.getIdentifierLoc(), 1911 diag::err_template_qualified_declarator_no_match) 1912 << (NestedNameSpecifier*)D.getCXXScopeSpec().getScopeRep() 1913 << D.getCXXScopeSpec().getRange(); 1914 return DeclPtrTy(); 1915 } 1916 1917 if (!DC->isDependentContext() && 1918 RequireCompleteDeclContext(D.getCXXScopeSpec())) 1919 return DeclPtrTy(); 1920 1921 if (isa<CXXRecordDecl>(DC) && !cast<CXXRecordDecl>(DC)->hasDefinition()) { 1922 Diag(D.getIdentifierLoc(), 1923 diag::err_member_def_undefined_record) 1924 << Name << DC << D.getCXXScopeSpec().getRange(); 1925 D.setInvalidType(); 1926 } 1927 1928 LookupQualifiedName(Previous, DC); 1929 1930 // Don't consider using declarations as previous declarations for 1931 // out-of-line members. 1932 RemoveUsingDecls(Previous); 1933 1934 // C++ 7.3.1.2p2: 1935 // Members (including explicit specializations of templates) of a named 1936 // namespace can also be defined outside that namespace by explicit 1937 // qualification of the name being defined, provided that the entity being 1938 // defined was already declared in the namespace and the definition appears 1939 // after the point of declaration in a namespace that encloses the 1940 // declarations namespace. 1941 // 1942 // Note that we only check the context at this point. We don't yet 1943 // have enough information to make sure that PrevDecl is actually 1944 // the declaration we want to match. For example, given: 1945 // 1946 // class X { 1947 // void f(); 1948 // void f(float); 1949 // }; 1950 // 1951 // void X::f(int) { } // ill-formed 1952 // 1953 // In this case, PrevDecl will point to the overload set 1954 // containing the two f's declared in X, but neither of them 1955 // matches. 1956 1957 // First check whether we named the global scope. 1958 if (isa<TranslationUnitDecl>(DC)) { 1959 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 1960 << Name << D.getCXXScopeSpec().getRange(); 1961 } else { 1962 DeclContext *Cur = CurContext; 1963 while (isa<LinkageSpecDecl>(Cur)) 1964 Cur = Cur->getParent(); 1965 if (!Cur->Encloses(DC)) { 1966 // The qualifying scope doesn't enclose the original declaration. 1967 // Emit diagnostic based on current scope. 1968 SourceLocation L = D.getIdentifierLoc(); 1969 SourceRange R = D.getCXXScopeSpec().getRange(); 1970 if (isa<FunctionDecl>(Cur)) 1971 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 1972 else 1973 Diag(L, diag::err_invalid_declarator_scope) 1974 << Name << cast<NamedDecl>(DC) << R; 1975 D.setInvalidType(); 1976 } 1977 } 1978 } 1979 1980 if (Previous.isSingleResult() && 1981 Previous.getFoundDecl()->isTemplateParameter()) { 1982 // Maybe we will complain about the shadowed template parameter. 1983 if (!D.isInvalidType()) 1984 if (DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), 1985 Previous.getFoundDecl())) 1986 D.setInvalidType(); 1987 1988 // Just pretend that we didn't see the previous declaration. 1989 Previous.clear(); 1990 } 1991 1992 // In C++, the previous declaration we find might be a tag type 1993 // (class or enum). In this case, the new declaration will hide the 1994 // tag type. Note that this does does not apply if we're declaring a 1995 // typedef (C++ [dcl.typedef]p4). 1996 if (Previous.isSingleTagDecl() && 1997 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 1998 Previous.clear(); 1999 2000 bool Redeclaration = false; 2001 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 2002 if (TemplateParamLists.size()) { 2003 Diag(D.getIdentifierLoc(), diag::err_template_typedef); 2004 return DeclPtrTy(); 2005 } 2006 2007 New = ActOnTypedefDeclarator(S, D, DC, R, TInfo, Previous, Redeclaration); 2008 } else if (R->isFunctionType()) { 2009 New = ActOnFunctionDeclarator(S, D, DC, R, TInfo, Previous, 2010 move(TemplateParamLists), 2011 IsFunctionDefinition, Redeclaration); 2012 } else { 2013 New = ActOnVariableDeclarator(S, D, DC, R, TInfo, Previous, 2014 move(TemplateParamLists), 2015 Redeclaration); 2016 } 2017 2018 if (New == 0) 2019 return DeclPtrTy(); 2020 2021 // If this has an identifier and is not an invalid redeclaration or 2022 // function template specialization, add it to the scope stack. 2023 if (Name && !(Redeclaration && New->isInvalidDecl())) 2024 PushOnScopeChains(New, S); 2025 2026 return DeclPtrTy::make(New); 2027} 2028 2029/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 2030/// types into constant array types in certain situations which would otherwise 2031/// be errors (for GCC compatibility). 2032static QualType TryToFixInvalidVariablyModifiedType(QualType T, 2033 ASTContext &Context, 2034 bool &SizeIsNegative) { 2035 // This method tries to turn a variable array into a constant 2036 // array even when the size isn't an ICE. This is necessary 2037 // for compatibility with code that depends on gcc's buggy 2038 // constant expression folding, like struct {char x[(int)(char*)2];} 2039 SizeIsNegative = false; 2040 2041 QualifierCollector Qs; 2042 const Type *Ty = Qs.strip(T); 2043 2044 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) { 2045 QualType Pointee = PTy->getPointeeType(); 2046 QualType FixedType = 2047 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative); 2048 if (FixedType.isNull()) return FixedType; 2049 FixedType = Context.getPointerType(FixedType); 2050 return Qs.apply(FixedType); 2051 } 2052 2053 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 2054 if (!VLATy) 2055 return QualType(); 2056 // FIXME: We should probably handle this case 2057 if (VLATy->getElementType()->isVariablyModifiedType()) 2058 return QualType(); 2059 2060 Expr::EvalResult EvalResult; 2061 if (!VLATy->getSizeExpr() || 2062 !VLATy->getSizeExpr()->Evaluate(EvalResult, Context) || 2063 !EvalResult.Val.isInt()) 2064 return QualType(); 2065 2066 llvm::APSInt &Res = EvalResult.Val.getInt(); 2067 if (Res >= llvm::APSInt(Res.getBitWidth(), Res.isUnsigned())) { 2068 // TODO: preserve the size expression in declarator info 2069 return Context.getConstantArrayType(VLATy->getElementType(), 2070 Res, ArrayType::Normal, 0); 2071 } 2072 2073 SizeIsNegative = true; 2074 return QualType(); 2075} 2076 2077/// \brief Register the given locally-scoped external C declaration so 2078/// that it can be found later for redeclarations 2079void 2080Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, 2081 const LookupResult &Previous, 2082 Scope *S) { 2083 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 2084 "Decl is not a locally-scoped decl!"); 2085 // Note that we have a locally-scoped external with this name. 2086 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 2087 2088 if (!Previous.isSingleResult()) 2089 return; 2090 2091 NamedDecl *PrevDecl = Previous.getFoundDecl(); 2092 2093 // If there was a previous declaration of this variable, it may be 2094 // in our identifier chain. Update the identifier chain with the new 2095 // declaration. 2096 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 2097 // The previous declaration was found on the identifer resolver 2098 // chain, so remove it from its scope. 2099 while (S && !S->isDeclScope(DeclPtrTy::make(PrevDecl))) 2100 S = S->getParent(); 2101 2102 if (S) 2103 S->RemoveDecl(DeclPtrTy::make(PrevDecl)); 2104 } 2105} 2106 2107/// \brief Diagnose function specifiers on a declaration of an identifier that 2108/// does not identify a function. 2109void Sema::DiagnoseFunctionSpecifiers(Declarator& D) { 2110 // FIXME: We should probably indicate the identifier in question to avoid 2111 // confusion for constructs like "inline int a(), b;" 2112 if (D.getDeclSpec().isInlineSpecified()) 2113 Diag(D.getDeclSpec().getInlineSpecLoc(), 2114 diag::err_inline_non_function); 2115 2116 if (D.getDeclSpec().isVirtualSpecified()) 2117 Diag(D.getDeclSpec().getVirtualSpecLoc(), 2118 diag::err_virtual_non_function); 2119 2120 if (D.getDeclSpec().isExplicitSpecified()) 2121 Diag(D.getDeclSpec().getExplicitSpecLoc(), 2122 diag::err_explicit_non_function); 2123} 2124 2125NamedDecl* 2126Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 2127 QualType R, TypeSourceInfo *TInfo, 2128 LookupResult &Previous, bool &Redeclaration) { 2129 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 2130 if (D.getCXXScopeSpec().isSet()) { 2131 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 2132 << D.getCXXScopeSpec().getRange(); 2133 D.setInvalidType(); 2134 // Pretend we didn't see the scope specifier. 2135 DC = 0; 2136 } 2137 2138 if (getLangOptions().CPlusPlus) { 2139 // Check that there are no default arguments (C++ only). 2140 CheckExtraCXXDefaultArguments(D); 2141 } 2142 2143 DiagnoseFunctionSpecifiers(D); 2144 2145 if (D.getDeclSpec().isThreadSpecified()) 2146 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 2147 2148 TypedefDecl *NewTD = ParseTypedefDecl(S, D, R, TInfo); 2149 if (!NewTD) return 0; 2150 2151 // Handle attributes prior to checking for duplicates in MergeVarDecl 2152 ProcessDeclAttributes(S, NewTD, D); 2153 2154 // Merge the decl with the existing one if appropriate. If the decl is 2155 // in an outer scope, it isn't the same thing. 2156 FilterLookupForScope(*this, Previous, DC, S, /*ConsiderLinkage*/ false); 2157 if (!Previous.empty()) { 2158 Redeclaration = true; 2159 MergeTypeDefDecl(NewTD, Previous); 2160 } 2161 2162 // C99 6.7.7p2: If a typedef name specifies a variably modified type 2163 // then it shall have block scope. 2164 QualType T = NewTD->getUnderlyingType(); 2165 if (T->isVariablyModifiedType()) { 2166 FunctionNeedsScopeChecking() = true; 2167 2168 if (S->getFnParent() == 0) { 2169 bool SizeIsNegative; 2170 QualType FixedTy = 2171 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative); 2172 if (!FixedTy.isNull()) { 2173 Diag(D.getIdentifierLoc(), diag::warn_illegal_constant_array_size); 2174 NewTD->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(FixedTy)); 2175 } else { 2176 if (SizeIsNegative) 2177 Diag(D.getIdentifierLoc(), diag::err_typecheck_negative_array_size); 2178 else if (T->isVariableArrayType()) 2179 Diag(D.getIdentifierLoc(), diag::err_vla_decl_in_file_scope); 2180 else 2181 Diag(D.getIdentifierLoc(), diag::err_vm_decl_in_file_scope); 2182 NewTD->setInvalidDecl(); 2183 } 2184 } 2185 } 2186 2187 // If this is the C FILE type, notify the AST context. 2188 if (IdentifierInfo *II = NewTD->getIdentifier()) 2189 if (!NewTD->isInvalidDecl() && 2190 NewTD->getDeclContext()->getLookupContext()->isTranslationUnit()) { 2191 if (II->isStr("FILE")) 2192 Context.setFILEDecl(NewTD); 2193 else if (II->isStr("jmp_buf")) 2194 Context.setjmp_bufDecl(NewTD); 2195 else if (II->isStr("sigjmp_buf")) 2196 Context.setsigjmp_bufDecl(NewTD); 2197 } 2198 2199 return NewTD; 2200} 2201 2202/// \brief Determines whether the given declaration is an out-of-scope 2203/// previous declaration. 2204/// 2205/// This routine should be invoked when name lookup has found a 2206/// previous declaration (PrevDecl) that is not in the scope where a 2207/// new declaration by the same name is being introduced. If the new 2208/// declaration occurs in a local scope, previous declarations with 2209/// linkage may still be considered previous declarations (C99 2210/// 6.2.2p4-5, C++ [basic.link]p6). 2211/// 2212/// \param PrevDecl the previous declaration found by name 2213/// lookup 2214/// 2215/// \param DC the context in which the new declaration is being 2216/// declared. 2217/// 2218/// \returns true if PrevDecl is an out-of-scope previous declaration 2219/// for a new delcaration with the same name. 2220static bool 2221isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 2222 ASTContext &Context) { 2223 if (!PrevDecl) 2224 return 0; 2225 2226 if (!PrevDecl->hasLinkage()) 2227 return false; 2228 2229 if (Context.getLangOptions().CPlusPlus) { 2230 // C++ [basic.link]p6: 2231 // If there is a visible declaration of an entity with linkage 2232 // having the same name and type, ignoring entities declared 2233 // outside the innermost enclosing namespace scope, the block 2234 // scope declaration declares that same entity and receives the 2235 // linkage of the previous declaration. 2236 DeclContext *OuterContext = DC->getLookupContext(); 2237 if (!OuterContext->isFunctionOrMethod()) 2238 // This rule only applies to block-scope declarations. 2239 return false; 2240 else { 2241 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 2242 if (PrevOuterContext->isRecord()) 2243 // We found a member function: ignore it. 2244 return false; 2245 else { 2246 // Find the innermost enclosing namespace for the new and 2247 // previous declarations. 2248 while (!OuterContext->isFileContext()) 2249 OuterContext = OuterContext->getParent(); 2250 while (!PrevOuterContext->isFileContext()) 2251 PrevOuterContext = PrevOuterContext->getParent(); 2252 2253 // The previous declaration is in a different namespace, so it 2254 // isn't the same function. 2255 if (OuterContext->getPrimaryContext() != 2256 PrevOuterContext->getPrimaryContext()) 2257 return false; 2258 } 2259 } 2260 } 2261 2262 return true; 2263} 2264 2265static void SetNestedNameSpecifier(DeclaratorDecl *DD, Declarator &D) { 2266 CXXScopeSpec &SS = D.getCXXScopeSpec(); 2267 if (!SS.isSet()) return; 2268 DD->setQualifierInfo(static_cast<NestedNameSpecifier*>(SS.getScopeRep()), 2269 SS.getRange()); 2270} 2271 2272NamedDecl* 2273Sema::ActOnVariableDeclarator(Scope* S, Declarator& D, DeclContext* DC, 2274 QualType R, TypeSourceInfo *TInfo, 2275 LookupResult &Previous, 2276 MultiTemplateParamsArg TemplateParamLists, 2277 bool &Redeclaration) { 2278 DeclarationName Name = GetNameForDeclarator(D); 2279 2280 // Check that there are no default arguments (C++ only). 2281 if (getLangOptions().CPlusPlus) 2282 CheckExtraCXXDefaultArguments(D); 2283 2284 VarDecl *NewVD; 2285 VarDecl::StorageClass SC; 2286 switch (D.getDeclSpec().getStorageClassSpec()) { 2287 default: assert(0 && "Unknown storage class!"); 2288 case DeclSpec::SCS_unspecified: SC = VarDecl::None; break; 2289 case DeclSpec::SCS_extern: SC = VarDecl::Extern; break; 2290 case DeclSpec::SCS_static: SC = VarDecl::Static; break; 2291 case DeclSpec::SCS_auto: SC = VarDecl::Auto; break; 2292 case DeclSpec::SCS_register: SC = VarDecl::Register; break; 2293 case DeclSpec::SCS_private_extern: SC = VarDecl::PrivateExtern; break; 2294 case DeclSpec::SCS_mutable: 2295 // mutable can only appear on non-static class members, so it's always 2296 // an error here 2297 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 2298 D.setInvalidType(); 2299 SC = VarDecl::None; 2300 break; 2301 } 2302 2303 IdentifierInfo *II = Name.getAsIdentifierInfo(); 2304 if (!II) { 2305 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 2306 << Name.getAsString(); 2307 return 0; 2308 } 2309 2310 DiagnoseFunctionSpecifiers(D); 2311 2312 if (!DC->isRecord() && S->getFnParent() == 0) { 2313 // C99 6.9p2: The storage-class specifiers auto and register shall not 2314 // appear in the declaration specifiers in an external declaration. 2315 if (SC == VarDecl::Auto || SC == VarDecl::Register) { 2316 2317 // If this is a register variable with an asm label specified, then this 2318 // is a GNU extension. 2319 if (SC == VarDecl::Register && D.getAsmLabel()) 2320 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register); 2321 else 2322 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 2323 D.setInvalidType(); 2324 } 2325 } 2326 if (DC->isRecord() && !CurContext->isRecord()) { 2327 // This is an out-of-line definition of a static data member. 2328 if (SC == VarDecl::Static) { 2329 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2330 diag::err_static_out_of_line) 2331 << CodeModificationHint::CreateRemoval( 2332 D.getDeclSpec().getStorageClassSpecLoc()); 2333 } else if (SC == VarDecl::None) 2334 SC = VarDecl::Static; 2335 } 2336 if (SC == VarDecl::Static) { 2337 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) { 2338 if (RD->isLocalClass()) 2339 Diag(D.getIdentifierLoc(), 2340 diag::err_static_data_member_not_allowed_in_local_class) 2341 << Name << RD->getDeclName(); 2342 } 2343 } 2344 2345 // Match up the template parameter lists with the scope specifier, then 2346 // determine whether we have a template or a template specialization. 2347 bool isExplicitSpecialization = false; 2348 if (TemplateParameterList *TemplateParams 2349 = MatchTemplateParametersToScopeSpecifier( 2350 D.getDeclSpec().getSourceRange().getBegin(), 2351 D.getCXXScopeSpec(), 2352 (TemplateParameterList**)TemplateParamLists.get(), 2353 TemplateParamLists.size(), 2354 isExplicitSpecialization)) { 2355 if (TemplateParams->size() > 0) { 2356 // There is no such thing as a variable template. 2357 Diag(D.getIdentifierLoc(), diag::err_template_variable) 2358 << II 2359 << SourceRange(TemplateParams->getTemplateLoc(), 2360 TemplateParams->getRAngleLoc()); 2361 return 0; 2362 } else { 2363 // There is an extraneous 'template<>' for this variable. Complain 2364 // about it, but allow the declaration of the variable. 2365 Diag(TemplateParams->getTemplateLoc(), 2366 diag::err_template_variable_noparams) 2367 << II 2368 << SourceRange(TemplateParams->getTemplateLoc(), 2369 TemplateParams->getRAngleLoc()); 2370 2371 isExplicitSpecialization = true; 2372 } 2373 } 2374 2375 NewVD = VarDecl::Create(Context, DC, D.getIdentifierLoc(), 2376 II, R, TInfo, SC); 2377 2378 if (D.isInvalidType()) 2379 NewVD->setInvalidDecl(); 2380 2381 SetNestedNameSpecifier(NewVD, D); 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 // Diagnose shadowed variables before filtering for scope. 2407 if (!D.getCXXScopeSpec().isSet()) 2408 DiagnoseShadow(S, D, Previous); 2409 2410 // Don't consider existing declarations that are in a different 2411 // scope and are out-of-semantic-context declarations (if the new 2412 // declaration has linkage). 2413 FilterLookupForScope(*this, Previous, DC, S, NewVD->hasLinkage()); 2414 2415 // Merge the decl with the existing one if appropriate. 2416 if (!Previous.empty()) { 2417 if (Previous.isSingleResult() && 2418 isa<FieldDecl>(Previous.getFoundDecl()) && 2419 D.getCXXScopeSpec().isSet()) { 2420 // The user tried to define a non-static data member 2421 // out-of-line (C++ [dcl.meaning]p1). 2422 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 2423 << D.getCXXScopeSpec().getRange(); 2424 Previous.clear(); 2425 NewVD->setInvalidDecl(); 2426 } 2427 } else if (D.getCXXScopeSpec().isSet()) { 2428 // No previous declaration in the qualifying scope. 2429 Diag(D.getIdentifierLoc(), diag::err_no_member) 2430 << Name << computeDeclContext(D.getCXXScopeSpec(), true) 2431 << D.getCXXScopeSpec().getRange(); 2432 NewVD->setInvalidDecl(); 2433 } 2434 2435 CheckVariableDeclaration(NewVD, Previous, Redeclaration); 2436 2437 // This is an explicit specialization of a static data member. Check it. 2438 if (isExplicitSpecialization && !NewVD->isInvalidDecl() && 2439 CheckMemberSpecialization(NewVD, Previous)) 2440 NewVD->setInvalidDecl(); 2441 2442 // attributes declared post-definition are currently ignored 2443 if (Previous.isSingleResult()) { 2444 VarDecl *Def = dyn_cast<VarDecl>(Previous.getFoundDecl()); 2445 if (Def && (Def = Def->getDefinition()) && 2446 Def != NewVD && D.hasAttributes()) { 2447 Diag(NewVD->getLocation(), diag::warn_attribute_precede_definition); 2448 Diag(Def->getLocation(), diag::note_previous_definition); 2449 } 2450 } 2451 2452 // If this is a locally-scoped extern C variable, update the map of 2453 // such variables. 2454 if (CurContext->isFunctionOrMethod() && NewVD->isExternC() && 2455 !NewVD->isInvalidDecl()) 2456 RegisterLocallyScopedExternCDecl(NewVD, Previous, S); 2457 2458 return NewVD; 2459} 2460 2461/// \brief Diagnose variable or built-in function shadowing. 2462/// 2463/// This method is called as soon as a NamedDecl materializes to check 2464/// if it shadows another local or global variable, or a built-in function. 2465/// 2466/// For performance reasons, the lookup results are reused from the calling 2467/// context. 2468/// 2469/// \param S the scope in which the shadowing name is being declared 2470/// \param R the lookup of the name 2471/// 2472void Sema::DiagnoseShadow(Scope *S, Declarator &D, 2473 const LookupResult& R) { 2474 // Return if warning is ignored. 2475 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow) == Diagnostic::Ignored) 2476 return; 2477 2478 // Don't diagnose declarations at file scope. The scope might not 2479 // have a DeclContext if (e.g.) we're parsing a function prototype. 2480 DeclContext *NewDC = static_cast<DeclContext*>(S->getEntity()); 2481 if (NewDC && NewDC->isFileContext()) 2482 return; 2483 2484 // Only diagnose if we're shadowing an unambiguous field or variable. 2485 if (R.getResultKind() != LookupResult::Found) 2486 return; 2487 2488 NamedDecl* ShadowedDecl = R.getFoundDecl(); 2489 if (!isa<VarDecl>(ShadowedDecl) && !isa<FieldDecl>(ShadowedDecl)) 2490 return; 2491 2492 DeclContext *OldDC = ShadowedDecl->getDeclContext(); 2493 2494 // Only warn about certain kinds of shadowing for class members. 2495 if (NewDC && NewDC->isRecord()) { 2496 // In particular, don't warn about shadowing non-class members. 2497 if (!OldDC->isRecord()) 2498 return; 2499 2500 // TODO: should we warn about static data members shadowing 2501 // static data members from base classes? 2502 2503 // TODO: don't diagnose for inaccessible shadowed members. 2504 // This is hard to do perfectly because we might friend the 2505 // shadowing context, but that's just a false negative. 2506 } 2507 2508 // Determine what kind of declaration we're shadowing. 2509 unsigned Kind; 2510 if (isa<RecordDecl>(OldDC)) { 2511 if (isa<FieldDecl>(ShadowedDecl)) 2512 Kind = 3; // field 2513 else 2514 Kind = 2; // static data member 2515 } else if (OldDC->isFileContext()) 2516 Kind = 1; // global 2517 else 2518 Kind = 0; // local 2519 2520 DeclarationName Name = R.getLookupName(); 2521 2522 // Emit warning and note. 2523 Diag(R.getNameLoc(), diag::warn_decl_shadow) << Name << Kind << OldDC; 2524 Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration); 2525} 2526 2527/// \brief Perform semantic checking on a newly-created variable 2528/// declaration. 2529/// 2530/// This routine performs all of the type-checking required for a 2531/// variable declaration once it has been built. It is used both to 2532/// check variables after they have been parsed and their declarators 2533/// have been translated into a declaration, and to check variables 2534/// that have been instantiated from a template. 2535/// 2536/// Sets NewVD->isInvalidDecl() if an error was encountered. 2537void Sema::CheckVariableDeclaration(VarDecl *NewVD, 2538 LookupResult &Previous, 2539 bool &Redeclaration) { 2540 // If the decl is already known invalid, don't check it. 2541 if (NewVD->isInvalidDecl()) 2542 return; 2543 2544 QualType T = NewVD->getType(); 2545 2546 if (T->isObjCInterfaceType()) { 2547 Diag(NewVD->getLocation(), diag::err_statically_allocated_object); 2548 return NewVD->setInvalidDecl(); 2549 } 2550 2551 // Emit an error if an address space was applied to decl with local storage. 2552 // This includes arrays of objects with address space qualifiers, but not 2553 // automatic variables that point to other address spaces. 2554 // ISO/IEC TR 18037 S5.1.2 2555 if (NewVD->hasLocalStorage() && (T.getAddressSpace() != 0)) { 2556 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 2557 return NewVD->setInvalidDecl(); 2558 } 2559 2560 if (NewVD->hasLocalStorage() && T.isObjCGCWeak() 2561 && !NewVD->hasAttr<BlocksAttr>()) 2562 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 2563 2564 bool isVM = T->isVariablyModifiedType(); 2565 if (isVM || NewVD->hasAttr<CleanupAttr>() || 2566 NewVD->hasAttr<BlocksAttr>() || 2567 // FIXME: We need to diagnose jumps passed initialized variables in C++. 2568 // However, this turns on the scope checker for everything with a variable 2569 // which may impact compile time. See if we can find a better solution 2570 // to this, perhaps only checking functions that contain gotos in C++? 2571 (LangOpts.CPlusPlus && NewVD->hasLocalStorage())) 2572 FunctionNeedsScopeChecking() = true; 2573 2574 if ((isVM && NewVD->hasLinkage()) || 2575 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { 2576 bool SizeIsNegative; 2577 QualType FixedTy = 2578 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative); 2579 2580 if (FixedTy.isNull() && T->isVariableArrayType()) { 2581 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 2582 // FIXME: This won't give the correct result for 2583 // int a[10][n]; 2584 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 2585 2586 if (NewVD->isFileVarDecl()) 2587 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 2588 << SizeRange; 2589 else if (NewVD->getStorageClass() == VarDecl::Static) 2590 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 2591 << SizeRange; 2592 else 2593 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 2594 << SizeRange; 2595 return NewVD->setInvalidDecl(); 2596 } 2597 2598 if (FixedTy.isNull()) { 2599 if (NewVD->isFileVarDecl()) 2600 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 2601 else 2602 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 2603 return NewVD->setInvalidDecl(); 2604 } 2605 2606 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 2607 NewVD->setType(FixedTy); 2608 } 2609 2610 if (Previous.empty() && NewVD->isExternC()) { 2611 // Since we did not find anything by this name and we're declaring 2612 // an extern "C" variable, look for a non-visible extern "C" 2613 // declaration with the same name. 2614 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 2615 = LocallyScopedExternalDecls.find(NewVD->getDeclName()); 2616 if (Pos != LocallyScopedExternalDecls.end()) 2617 Previous.addDecl(Pos->second); 2618 } 2619 2620 if (T->isVoidType() && !NewVD->hasExternalStorage()) { 2621 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 2622 << T; 2623 return NewVD->setInvalidDecl(); 2624 } 2625 2626 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { 2627 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); 2628 return NewVD->setInvalidDecl(); 2629 } 2630 2631 if (isVM && NewVD->hasAttr<BlocksAttr>()) { 2632 Diag(NewVD->getLocation(), diag::err_block_on_vm); 2633 return NewVD->setInvalidDecl(); 2634 } 2635 2636 if (!Previous.empty()) { 2637 Redeclaration = true; 2638 MergeVarDecl(NewVD, Previous); 2639 } 2640} 2641 2642/// \brief Data used with FindOverriddenMethod 2643struct FindOverriddenMethodData { 2644 Sema *S; 2645 CXXMethodDecl *Method; 2646}; 2647 2648/// \brief Member lookup function that determines whether a given C++ 2649/// method overrides a method in a base class, to be used with 2650/// CXXRecordDecl::lookupInBases(). 2651static bool FindOverriddenMethod(const CXXBaseSpecifier *Specifier, 2652 CXXBasePath &Path, 2653 void *UserData) { 2654 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 2655 2656 FindOverriddenMethodData *Data 2657 = reinterpret_cast<FindOverriddenMethodData*>(UserData); 2658 2659 DeclarationName Name = Data->Method->getDeclName(); 2660 2661 // FIXME: Do we care about other names here too? 2662 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 2663 // We really want to find the base class constructor here. 2664 QualType T = Data->S->Context.getTypeDeclType(BaseRecord); 2665 CanQualType CT = Data->S->Context.getCanonicalType(T); 2666 2667 Name = Data->S->Context.DeclarationNames.getCXXDestructorName(CT); 2668 } 2669 2670 for (Path.Decls = BaseRecord->lookup(Name); 2671 Path.Decls.first != Path.Decls.second; 2672 ++Path.Decls.first) { 2673 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*Path.Decls.first)) { 2674 if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD)) 2675 return true; 2676 } 2677 } 2678 2679 return false; 2680} 2681 2682/// AddOverriddenMethods - See if a method overrides any in the base classes, 2683/// and if so, check that it's a valid override and remember it. 2684void Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 2685 // Look for virtual methods in base classes that this method might override. 2686 CXXBasePaths Paths; 2687 FindOverriddenMethodData Data; 2688 Data.Method = MD; 2689 Data.S = this; 2690 if (DC->lookupInBases(&FindOverriddenMethod, &Data, Paths)) { 2691 for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(), 2692 E = Paths.found_decls_end(); I != E; ++I) { 2693 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) { 2694 if (!CheckOverridingFunctionReturnType(MD, OldMD) && 2695 !CheckOverridingFunctionExceptionSpec(MD, OldMD) && 2696 !CheckOverridingFunctionAttributes(MD, OldMD)) 2697 MD->addOverriddenMethod(OldMD->getCanonicalDecl()); 2698 } 2699 } 2700 } 2701} 2702 2703NamedDecl* 2704Sema::ActOnFunctionDeclarator(Scope* S, Declarator& D, DeclContext* DC, 2705 QualType R, TypeSourceInfo *TInfo, 2706 LookupResult &Previous, 2707 MultiTemplateParamsArg TemplateParamLists, 2708 bool IsFunctionDefinition, bool &Redeclaration) { 2709 assert(R.getTypePtr()->isFunctionType()); 2710 2711 DeclarationName Name = GetNameForDeclarator(D); 2712 FunctionDecl::StorageClass SC = FunctionDecl::None; 2713 switch (D.getDeclSpec().getStorageClassSpec()) { 2714 default: assert(0 && "Unknown storage class!"); 2715 case DeclSpec::SCS_auto: 2716 case DeclSpec::SCS_register: 2717 case DeclSpec::SCS_mutable: 2718 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2719 diag::err_typecheck_sclass_func); 2720 D.setInvalidType(); 2721 break; 2722 case DeclSpec::SCS_unspecified: SC = FunctionDecl::None; break; 2723 case DeclSpec::SCS_extern: SC = FunctionDecl::Extern; break; 2724 case DeclSpec::SCS_static: { 2725 if (CurContext->getLookupContext()->isFunctionOrMethod()) { 2726 // C99 6.7.1p5: 2727 // The declaration of an identifier for a function that has 2728 // block scope shall have no explicit storage-class specifier 2729 // other than extern 2730 // See also (C++ [dcl.stc]p4). 2731 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2732 diag::err_static_block_func); 2733 SC = FunctionDecl::None; 2734 } else 2735 SC = FunctionDecl::Static; 2736 break; 2737 } 2738 case DeclSpec::SCS_private_extern: SC = FunctionDecl::PrivateExtern;break; 2739 } 2740 2741 if (D.getDeclSpec().isThreadSpecified()) 2742 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 2743 2744 bool isFriend = D.getDeclSpec().isFriendSpecified(); 2745 bool isInline = D.getDeclSpec().isInlineSpecified(); 2746 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2747 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 2748 2749 // Check that the return type is not an abstract class type. 2750 // For record types, this is done by the AbstractClassUsageDiagnoser once 2751 // the class has been completely parsed. 2752 if (!DC->isRecord() && 2753 RequireNonAbstractType(D.getIdentifierLoc(), 2754 R->getAs<FunctionType>()->getResultType(), 2755 diag::err_abstract_type_in_decl, 2756 AbstractReturnType)) 2757 D.setInvalidType(); 2758 2759 // Do not allow returning a objc interface by-value. 2760 if (R->getAs<FunctionType>()->getResultType()->isObjCInterfaceType()) { 2761 Diag(D.getIdentifierLoc(), 2762 diag::err_object_cannot_be_passed_returned_by_value) << 0 2763 << R->getAs<FunctionType>()->getResultType(); 2764 D.setInvalidType(); 2765 } 2766 2767 bool isVirtualOkay = false; 2768 FunctionDecl *NewFD; 2769 2770 if (isFriend) { 2771 // C++ [class.friend]p5 2772 // A function can be defined in a friend declaration of a 2773 // class . . . . Such a function is implicitly inline. 2774 isInline |= IsFunctionDefinition; 2775 } 2776 2777 if (Name.getNameKind() == DeclarationName::CXXConstructorName) { 2778 // This is a C++ constructor declaration. 2779 assert(DC->isRecord() && 2780 "Constructors can only be declared in a member context"); 2781 2782 R = CheckConstructorDeclarator(D, R, SC); 2783 2784 // Create the new declaration 2785 NewFD = CXXConstructorDecl::Create(Context, 2786 cast<CXXRecordDecl>(DC), 2787 D.getIdentifierLoc(), Name, R, TInfo, 2788 isExplicit, isInline, 2789 /*isImplicitlyDeclared=*/false); 2790 } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 2791 // This is a C++ destructor declaration. 2792 if (DC->isRecord()) { 2793 R = CheckDestructorDeclarator(D, SC); 2794 2795 NewFD = CXXDestructorDecl::Create(Context, 2796 cast<CXXRecordDecl>(DC), 2797 D.getIdentifierLoc(), Name, R, 2798 isInline, 2799 /*isImplicitlyDeclared=*/false); 2800 NewFD->setTypeSourceInfo(TInfo); 2801 2802 isVirtualOkay = true; 2803 } else { 2804 Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 2805 2806 // Create a FunctionDecl to satisfy the function definition parsing 2807 // code path. 2808 NewFD = FunctionDecl::Create(Context, DC, D.getIdentifierLoc(), 2809 Name, R, TInfo, SC, isInline, 2810 /*hasPrototype=*/true); 2811 D.setInvalidType(); 2812 } 2813 } else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) { 2814 if (!DC->isRecord()) { 2815 Diag(D.getIdentifierLoc(), 2816 diag::err_conv_function_not_member); 2817 return 0; 2818 } 2819 2820 CheckConversionDeclarator(D, R, SC); 2821 NewFD = CXXConversionDecl::Create(Context, cast<CXXRecordDecl>(DC), 2822 D.getIdentifierLoc(), Name, R, TInfo, 2823 isInline, isExplicit); 2824 2825 isVirtualOkay = true; 2826 } else if (DC->isRecord()) { 2827 // If the of the function is the same as the name of the record, then this 2828 // must be an invalid constructor that has a return type. 2829 // (The parser checks for a return type and makes the declarator a 2830 // constructor if it has no return type). 2831 // must have an invalid constructor that has a return type 2832 if (Name.getAsIdentifierInfo() && 2833 Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ 2834 Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 2835 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2836 << SourceRange(D.getIdentifierLoc()); 2837 return 0; 2838 } 2839 2840 bool isStatic = SC == FunctionDecl::Static; 2841 2842 // [class.free]p1: 2843 // Any allocation function for a class T is a static member 2844 // (even if not explicitly declared static). 2845 if (Name.getCXXOverloadedOperator() == OO_New || 2846 Name.getCXXOverloadedOperator() == OO_Array_New) 2847 isStatic = true; 2848 2849 // [class.free]p6 Any deallocation function for a class X is a static member 2850 // (even if not explicitly declared static). 2851 if (Name.getCXXOverloadedOperator() == OO_Delete || 2852 Name.getCXXOverloadedOperator() == OO_Array_Delete) 2853 isStatic = true; 2854 2855 // This is a C++ method declaration. 2856 NewFD = CXXMethodDecl::Create(Context, cast<CXXRecordDecl>(DC), 2857 D.getIdentifierLoc(), Name, R, TInfo, 2858 isStatic, isInline); 2859 2860 isVirtualOkay = !isStatic; 2861 } else { 2862 // Determine whether the function was written with a 2863 // prototype. This true when: 2864 // - we're in C++ (where every function has a prototype), 2865 // - there is a prototype in the declarator, or 2866 // - the type R of the function is some kind of typedef or other reference 2867 // to a type name (which eventually refers to a function type). 2868 bool HasPrototype = 2869 getLangOptions().CPlusPlus || 2870 (D.getNumTypeObjects() && D.getTypeObject(0).Fun.hasPrototype) || 2871 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 2872 2873 NewFD = FunctionDecl::Create(Context, DC, 2874 D.getIdentifierLoc(), 2875 Name, R, TInfo, SC, isInline, HasPrototype); 2876 } 2877 2878 if (D.isInvalidType()) 2879 NewFD->setInvalidDecl(); 2880 2881 SetNestedNameSpecifier(NewFD, D); 2882 2883 // Set the lexical context. If the declarator has a C++ 2884 // scope specifier, or is the object of a friend declaration, the 2885 // lexical context will be different from the semantic context. 2886 NewFD->setLexicalDeclContext(CurContext); 2887 2888 // Match up the template parameter lists with the scope specifier, then 2889 // determine whether we have a template or a template specialization. 2890 FunctionTemplateDecl *FunctionTemplate = 0; 2891 bool isExplicitSpecialization = false; 2892 bool isFunctionTemplateSpecialization = false; 2893 if (TemplateParameterList *TemplateParams 2894 = MatchTemplateParametersToScopeSpecifier( 2895 D.getDeclSpec().getSourceRange().getBegin(), 2896 D.getCXXScopeSpec(), 2897 (TemplateParameterList**)TemplateParamLists.get(), 2898 TemplateParamLists.size(), 2899 isExplicitSpecialization)) { 2900 if (TemplateParams->size() > 0) { 2901 // This is a function template 2902 2903 // Check that we can declare a template here. 2904 if (CheckTemplateDeclScope(S, TemplateParams)) 2905 return 0; 2906 2907 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC, 2908 NewFD->getLocation(), 2909 Name, TemplateParams, 2910 NewFD); 2911 FunctionTemplate->setLexicalDeclContext(CurContext); 2912 NewFD->setDescribedFunctionTemplate(FunctionTemplate); 2913 } else { 2914 // This is a function template specialization. 2915 isFunctionTemplateSpecialization = true; 2916 } 2917 2918 // FIXME: Free this memory properly. 2919 TemplateParamLists.release(); 2920 } 2921 2922 // C++ [dcl.fct.spec]p5: 2923 // The virtual specifier shall only be used in declarations of 2924 // nonstatic class member functions that appear within a 2925 // member-specification of a class declaration; see 10.3. 2926 // 2927 if (isVirtual && !NewFD->isInvalidDecl()) { 2928 if (!isVirtualOkay) { 2929 Diag(D.getDeclSpec().getVirtualSpecLoc(), 2930 diag::err_virtual_non_function); 2931 } else if (!CurContext->isRecord()) { 2932 // 'virtual' was specified outside of the class. 2933 Diag(D.getDeclSpec().getVirtualSpecLoc(), diag::err_virtual_out_of_class) 2934 << CodeModificationHint::CreateRemoval( 2935 D.getDeclSpec().getVirtualSpecLoc()); 2936 } else { 2937 // Okay: Add virtual to the method. 2938 CXXRecordDecl *CurClass = cast<CXXRecordDecl>(DC); 2939 CurClass->setMethodAsVirtual(NewFD); 2940 } 2941 } 2942 2943 // C++ [dcl.fct.spec]p6: 2944 // The explicit specifier shall be used only in the declaration of a 2945 // constructor or conversion function within its class definition; see 12.3.1 2946 // and 12.3.2. 2947 if (isExplicit && !NewFD->isInvalidDecl()) { 2948 if (!CurContext->isRecord()) { 2949 // 'explicit' was specified outside of the class. 2950 Diag(D.getDeclSpec().getExplicitSpecLoc(), 2951 diag::err_explicit_out_of_class) 2952 << CodeModificationHint::CreateRemoval( 2953 D.getDeclSpec().getExplicitSpecLoc()); 2954 } else if (!isa<CXXConstructorDecl>(NewFD) && 2955 !isa<CXXConversionDecl>(NewFD)) { 2956 // 'explicit' was specified on a function that wasn't a constructor 2957 // or conversion function. 2958 Diag(D.getDeclSpec().getExplicitSpecLoc(), 2959 diag::err_explicit_non_ctor_or_conv_function) 2960 << CodeModificationHint::CreateRemoval( 2961 D.getDeclSpec().getExplicitSpecLoc()); 2962 } 2963 } 2964 2965 // Filter out previous declarations that don't match the scope. 2966 FilterLookupForScope(*this, Previous, DC, S, NewFD->hasLinkage()); 2967 2968 if (isFriend) { 2969 // DC is the namespace in which the function is being declared. 2970 assert((DC->isFileContext() || !Previous.empty()) && 2971 "previously-undeclared friend function being created " 2972 "in a non-namespace context"); 2973 2974 if (FunctionTemplate) { 2975 FunctionTemplate->setObjectOfFriendDecl( 2976 /* PreviouslyDeclared= */ !Previous.empty()); 2977 FunctionTemplate->setAccess(AS_public); 2978 } 2979 else 2980 NewFD->setObjectOfFriendDecl(/* PreviouslyDeclared= */ !Previous.empty()); 2981 2982 NewFD->setAccess(AS_public); 2983 } 2984 2985 if (SC == FunctionDecl::Static && isa<CXXMethodDecl>(NewFD) && 2986 !CurContext->isRecord()) { 2987 // C++ [class.static]p1: 2988 // A data or function member of a class may be declared static 2989 // in a class definition, in which case it is a static member of 2990 // the class. 2991 2992 // Complain about the 'static' specifier if it's on an out-of-line 2993 // member function definition. 2994 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2995 diag::err_static_out_of_line) 2996 << CodeModificationHint::CreateRemoval( 2997 D.getDeclSpec().getStorageClassSpecLoc()); 2998 } 2999 3000 // Handle GNU asm-label extension (encoded as an attribute). 3001 if (Expr *E = (Expr*) D.getAsmLabel()) { 3002 // The parser guarantees this is a string. 3003 StringLiteral *SE = cast<StringLiteral>(E); 3004 NewFD->addAttr(::new (Context) AsmLabelAttr(Context, SE->getString())); 3005 } 3006 3007 // Copy the parameter declarations from the declarator D to the function 3008 // declaration NewFD, if they are available. First scavenge them into Params. 3009 llvm::SmallVector<ParmVarDecl*, 16> Params; 3010 if (D.getNumTypeObjects() > 0) { 3011 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 3012 3013 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 3014 // function that takes no arguments, not a function that takes a 3015 // single void argument. 3016 // We let through "const void" here because Sema::GetTypeForDeclarator 3017 // already checks for that case. 3018 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 3019 FTI.ArgInfo[0].Param && 3020 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()) { 3021 // Empty arg list, don't push any params. 3022 ParmVarDecl *Param = FTI.ArgInfo[0].Param.getAs<ParmVarDecl>(); 3023 3024 // In C++, the empty parameter-type-list must be spelled "void"; a 3025 // typedef of void is not permitted. 3026 if (getLangOptions().CPlusPlus && 3027 Param->getType().getUnqualifiedType() != Context.VoidTy) 3028 Diag(Param->getLocation(), diag::err_param_typedef_of_void); 3029 // FIXME: Leaks decl? 3030 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 3031 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 3032 ParmVarDecl *Param = FTI.ArgInfo[i].Param.getAs<ParmVarDecl>(); 3033 assert(Param->getDeclContext() != NewFD && "Was set before ?"); 3034 Param->setDeclContext(NewFD); 3035 Params.push_back(Param); 3036 } 3037 } 3038 3039 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) { 3040 // When we're declaring a function with a typedef, typeof, etc as in the 3041 // following example, we'll need to synthesize (unnamed) 3042 // parameters for use in the declaration. 3043 // 3044 // @code 3045 // typedef void fn(int); 3046 // fn f; 3047 // @endcode 3048 3049 // Synthesize a parameter for each argument type. 3050 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 3051 AE = FT->arg_type_end(); AI != AE; ++AI) { 3052 ParmVarDecl *Param = ParmVarDecl::Create(Context, NewFD, 3053 SourceLocation(), 0, 3054 *AI, /*TInfo=*/0, 3055 VarDecl::None, 0); 3056 Param->setImplicit(); 3057 Params.push_back(Param); 3058 } 3059 } else { 3060 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && 3061 "Should not need args for typedef of non-prototype fn"); 3062 } 3063 // Finally, we know we have the right number of parameters, install them. 3064 NewFD->setParams(Params.data(), Params.size()); 3065 3066 // If the declarator is a template-id, translate the parser's template 3067 // argument list into our AST format. 3068 bool HasExplicitTemplateArgs = false; 3069 TemplateArgumentListInfo TemplateArgs; 3070 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) { 3071 TemplateIdAnnotation *TemplateId = D.getName().TemplateId; 3072 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc); 3073 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc); 3074 ASTTemplateArgsPtr TemplateArgsPtr(*this, 3075 TemplateId->getTemplateArgs(), 3076 TemplateId->NumArgs); 3077 translateTemplateArguments(TemplateArgsPtr, 3078 TemplateArgs); 3079 TemplateArgsPtr.release(); 3080 3081 HasExplicitTemplateArgs = true; 3082 3083 if (FunctionTemplate) { 3084 // FIXME: Diagnose function template with explicit template 3085 // arguments. 3086 HasExplicitTemplateArgs = false; 3087 } else if (!isFunctionTemplateSpecialization && 3088 !D.getDeclSpec().isFriendSpecified()) { 3089 // We have encountered something that the user meant to be a 3090 // specialization (because it has explicitly-specified template 3091 // arguments) but that was not introduced with a "template<>" (or had 3092 // too few of them). 3093 Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header) 3094 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc) 3095 << CodeModificationHint::CreateInsertion( 3096 D.getDeclSpec().getSourceRange().getBegin(), 3097 "template<> "); 3098 isFunctionTemplateSpecialization = true; 3099 } 3100 } 3101 3102 if (isFunctionTemplateSpecialization) { 3103 if (CheckFunctionTemplateSpecialization(NewFD, 3104 (HasExplicitTemplateArgs ? &TemplateArgs : 0), 3105 Previous)) 3106 NewFD->setInvalidDecl(); 3107 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD) && 3108 CheckMemberSpecialization(NewFD, Previous)) 3109 NewFD->setInvalidDecl(); 3110 3111 // Perform semantic checking on the function declaration. 3112 bool OverloadableAttrRequired = false; // FIXME: HACK! 3113 CheckFunctionDeclaration(S, NewFD, Previous, isExplicitSpecialization, 3114 Redeclaration, /*FIXME:*/OverloadableAttrRequired); 3115 3116 assert((NewFD->isInvalidDecl() || !Redeclaration || 3117 Previous.getResultKind() != LookupResult::FoundOverloaded) && 3118 "previous declaration set still overloaded"); 3119 3120 // If we have a function template, check the template parameter 3121 // list. This will check and merge default template arguments. 3122 if (FunctionTemplate) { 3123 FunctionTemplateDecl *PrevTemplate = FunctionTemplate->getPreviousDeclaration(); 3124 CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(), 3125 PrevTemplate? PrevTemplate->getTemplateParameters() : 0, 3126 D.getDeclSpec().isFriendSpecified()? TPC_FriendFunctionTemplate 3127 : TPC_FunctionTemplate); 3128 } 3129 3130 if (D.getCXXScopeSpec().isSet() && !NewFD->isInvalidDecl()) { 3131 // Fake up an access specifier if it's supposed to be a class member. 3132 if (!Redeclaration && isa<CXXRecordDecl>(NewFD->getDeclContext())) 3133 NewFD->setAccess(AS_public); 3134 3135 // An out-of-line member function declaration must also be a 3136 // definition (C++ [dcl.meaning]p1). 3137 // Note that this is not the case for explicit specializations of 3138 // function templates or member functions of class templates, per 3139 // C++ [temp.expl.spec]p2. 3140 if (!IsFunctionDefinition && !isFriend && 3141 !isFunctionTemplateSpecialization && !isExplicitSpecialization) { 3142 Diag(NewFD->getLocation(), diag::err_out_of_line_declaration) 3143 << D.getCXXScopeSpec().getRange(); 3144 NewFD->setInvalidDecl(); 3145 } else if (!Redeclaration && 3146 !(isFriend && CurContext->isDependentContext())) { 3147 // The user tried to provide an out-of-line definition for a 3148 // function that is a member of a class or namespace, but there 3149 // was no such member function declared (C++ [class.mfct]p2, 3150 // C++ [namespace.memdef]p2). For example: 3151 // 3152 // class X { 3153 // void f() const; 3154 // }; 3155 // 3156 // void X::f() { } // ill-formed 3157 // 3158 // Complain about this problem, and attempt to suggest close 3159 // matches (e.g., those that differ only in cv-qualifiers and 3160 // whether the parameter types are references). 3161 Diag(D.getIdentifierLoc(), diag::err_member_def_does_not_match) 3162 << Name << DC << D.getCXXScopeSpec().getRange(); 3163 NewFD->setInvalidDecl(); 3164 3165 LookupResult Prev(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 3166 ForRedeclaration); 3167 LookupQualifiedName(Prev, DC); 3168 assert(!Prev.isAmbiguous() && 3169 "Cannot have an ambiguity in previous-declaration lookup"); 3170 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 3171 Func != FuncEnd; ++Func) { 3172 if (isa<FunctionDecl>(*Func) && 3173 isNearlyMatchingFunction(Context, cast<FunctionDecl>(*Func), NewFD)) 3174 Diag((*Func)->getLocation(), diag::note_member_def_close_match); 3175 } 3176 } 3177 } 3178 3179 // Handle attributes. We need to have merged decls when handling attributes 3180 // (for example to check for conflicts, etc). 3181 // FIXME: This needs to happen before we merge declarations. Then, 3182 // let attribute merging cope with attribute conflicts. 3183 ProcessDeclAttributes(S, NewFD, D); 3184 3185 // attributes declared post-definition are currently ignored 3186 if (Redeclaration && Previous.isSingleResult()) { 3187 const FunctionDecl *Def; 3188 FunctionDecl *PrevFD = dyn_cast<FunctionDecl>(Previous.getFoundDecl()); 3189 if (PrevFD && PrevFD->getBody(Def) && D.hasAttributes()) { 3190 Diag(NewFD->getLocation(), diag::warn_attribute_precede_definition); 3191 Diag(Def->getLocation(), diag::note_previous_definition); 3192 } 3193 } 3194 3195 AddKnownFunctionAttributes(NewFD); 3196 3197 if (OverloadableAttrRequired && !NewFD->getAttr<OverloadableAttr>()) { 3198 // If a function name is overloadable in C, then every function 3199 // with that name must be marked "overloadable". 3200 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 3201 << Redeclaration << NewFD; 3202 if (!Previous.empty()) 3203 Diag(Previous.getRepresentativeDecl()->getLocation(), 3204 diag::note_attribute_overloadable_prev_overload); 3205 NewFD->addAttr(::new (Context) OverloadableAttr()); 3206 } 3207 3208 // If this is a locally-scoped extern C function, update the 3209 // map of such names. 3210 if (CurContext->isFunctionOrMethod() && NewFD->isExternC() 3211 && !NewFD->isInvalidDecl()) 3212 RegisterLocallyScopedExternCDecl(NewFD, Previous, S); 3213 3214 // Set this FunctionDecl's range up to the right paren. 3215 NewFD->setLocEnd(D.getSourceRange().getEnd()); 3216 3217 if (FunctionTemplate && NewFD->isInvalidDecl()) 3218 FunctionTemplate->setInvalidDecl(); 3219 3220 if (FunctionTemplate) 3221 return FunctionTemplate; 3222 3223 3224 // Keep track of static, non-inlined function definitions that 3225 // have not been used. We will warn later. 3226 // FIXME: Also include static functions declared but not defined. 3227 if (!NewFD->isInvalidDecl() && IsFunctionDefinition 3228 && !NewFD->isInlined() && NewFD->getLinkage() == InternalLinkage 3229 && !NewFD->isUsed() && !NewFD->hasAttr<UnusedAttr>()) 3230 UnusedStaticFuncs.push_back(NewFD); 3231 3232 return NewFD; 3233} 3234 3235/// \brief Perform semantic checking of a new function declaration. 3236/// 3237/// Performs semantic analysis of the new function declaration 3238/// NewFD. This routine performs all semantic checking that does not 3239/// require the actual declarator involved in the declaration, and is 3240/// used both for the declaration of functions as they are parsed 3241/// (called via ActOnDeclarator) and for the declaration of functions 3242/// that have been instantiated via C++ template instantiation (called 3243/// via InstantiateDecl). 3244/// 3245/// \param IsExplicitSpecialiation whether this new function declaration is 3246/// an explicit specialization of the previous declaration. 3247/// 3248/// This sets NewFD->isInvalidDecl() to true if there was an error. 3249void Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD, 3250 LookupResult &Previous, 3251 bool IsExplicitSpecialization, 3252 bool &Redeclaration, 3253 bool &OverloadableAttrRequired) { 3254 // If NewFD is already known erroneous, don't do any of this checking. 3255 if (NewFD->isInvalidDecl()) 3256 return; 3257 3258 if (NewFD->getResultType()->isVariablyModifiedType()) { 3259 // Functions returning a variably modified type violate C99 6.7.5.2p2 3260 // because all functions have linkage. 3261 Diag(NewFD->getLocation(), diag::err_vm_func_decl); 3262 return NewFD->setInvalidDecl(); 3263 } 3264 3265 if (NewFD->isMain()) 3266 CheckMain(NewFD); 3267 3268 // Check for a previous declaration of this name. 3269 if (Previous.empty() && NewFD->isExternC()) { 3270 // Since we did not find anything by this name and we're declaring 3271 // an extern "C" function, look for a non-visible extern "C" 3272 // declaration with the same name. 3273 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3274 = LocallyScopedExternalDecls.find(NewFD->getDeclName()); 3275 if (Pos != LocallyScopedExternalDecls.end()) 3276 Previous.addDecl(Pos->second); 3277 } 3278 3279 // Merge or overload the declaration with an existing declaration of 3280 // the same name, if appropriate. 3281 if (!Previous.empty()) { 3282 // Determine whether NewFD is an overload of PrevDecl or 3283 // a declaration that requires merging. If it's an overload, 3284 // there's no more work to do here; we'll just add the new 3285 // function to the scope. 3286 3287 NamedDecl *OldDecl = 0; 3288 if (!AllowOverloadingOfFunction(Previous, Context)) { 3289 Redeclaration = true; 3290 OldDecl = Previous.getFoundDecl(); 3291 } else { 3292 if (!getLangOptions().CPlusPlus) { 3293 OverloadableAttrRequired = true; 3294 3295 // Functions marked "overloadable" must have a prototype (that 3296 // we can't get through declaration merging). 3297 if (!NewFD->getType()->getAs<FunctionProtoType>()) { 3298 Diag(NewFD->getLocation(), 3299 diag::err_attribute_overloadable_no_prototype) 3300 << NewFD; 3301 Redeclaration = true; 3302 3303 // Turn this into a variadic function with no parameters. 3304 QualType R = Context.getFunctionType( 3305 NewFD->getType()->getAs<FunctionType>()->getResultType(), 3306 0, 0, true, 0, false, false, 0, 0, false, CC_Default); 3307 NewFD->setType(R); 3308 return NewFD->setInvalidDecl(); 3309 } 3310 } 3311 3312 switch (CheckOverload(NewFD, Previous, OldDecl)) { 3313 case Ovl_Match: 3314 Redeclaration = true; 3315 if (isa<UsingShadowDecl>(OldDecl) && CurContext->isRecord()) { 3316 HideUsingShadowDecl(S, cast<UsingShadowDecl>(OldDecl)); 3317 Redeclaration = false; 3318 } 3319 break; 3320 3321 case Ovl_NonFunction: 3322 Redeclaration = true; 3323 break; 3324 3325 case Ovl_Overload: 3326 Redeclaration = false; 3327 break; 3328 } 3329 } 3330 3331 if (Redeclaration) { 3332 // NewFD and OldDecl represent declarations that need to be 3333 // merged. 3334 if (MergeFunctionDecl(NewFD, OldDecl)) 3335 return NewFD->setInvalidDecl(); 3336 3337 Previous.clear(); 3338 Previous.addDecl(OldDecl); 3339 3340 if (FunctionTemplateDecl *OldTemplateDecl 3341 = dyn_cast<FunctionTemplateDecl>(OldDecl)) { 3342 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl()); 3343 FunctionTemplateDecl *NewTemplateDecl 3344 = NewFD->getDescribedFunctionTemplate(); 3345 assert(NewTemplateDecl && "Template/non-template mismatch"); 3346 if (CXXMethodDecl *Method 3347 = dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) { 3348 Method->setAccess(OldTemplateDecl->getAccess()); 3349 NewTemplateDecl->setAccess(OldTemplateDecl->getAccess()); 3350 } 3351 3352 // If this is an explicit specialization of a member that is a function 3353 // template, mark it as a member specialization. 3354 if (IsExplicitSpecialization && 3355 NewTemplateDecl->getInstantiatedFromMemberTemplate()) { 3356 NewTemplateDecl->setMemberSpecialization(); 3357 assert(OldTemplateDecl->isMemberSpecialization()); 3358 } 3359 } else { 3360 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions 3361 NewFD->setAccess(OldDecl->getAccess()); 3362 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 3363 } 3364 } 3365 } 3366 3367 // Semantic checking for this function declaration (in isolation). 3368 if (getLangOptions().CPlusPlus) { 3369 // C++-specific checks. 3370 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { 3371 CheckConstructor(Constructor); 3372 } else if (CXXDestructorDecl *Destructor = 3373 dyn_cast<CXXDestructorDecl>(NewFD)) { 3374 CXXRecordDecl *Record = Destructor->getParent(); 3375 QualType ClassType = Context.getTypeDeclType(Record); 3376 3377 // FIXME: Shouldn't we be able to perform thisc heck even when the class 3378 // type is dependent? Both gcc and edg can handle that. 3379 if (!ClassType->isDependentType()) { 3380 DeclarationName Name 3381 = Context.DeclarationNames.getCXXDestructorName( 3382 Context.getCanonicalType(ClassType)); 3383 if (NewFD->getDeclName() != Name) { 3384 Diag(NewFD->getLocation(), diag::err_destructor_name); 3385 return NewFD->setInvalidDecl(); 3386 } 3387 } 3388 3389 Record->setUserDeclaredDestructor(true); 3390 // C++ [class]p4: A POD-struct is an aggregate class that has [...] no 3391 // user-defined destructor. 3392 Record->setPOD(false); 3393 3394 // C++ [class.dtor]p3: A destructor is trivial if it is an implicitly- 3395 // declared destructor. 3396 // FIXME: C++0x: don't do this for "= default" destructors 3397 Record->setHasTrivialDestructor(false); 3398 } else if (CXXConversionDecl *Conversion 3399 = dyn_cast<CXXConversionDecl>(NewFD)) { 3400 ActOnConversionDeclarator(Conversion); 3401 } 3402 3403 // Find any virtual functions that this function overrides. 3404 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) { 3405 if (!Method->isFunctionTemplateSpecialization() && 3406 !Method->getDescribedFunctionTemplate()) 3407 AddOverriddenMethods(Method->getParent(), Method); 3408 } 3409 3410 // Additional checks for the destructor; make sure we do this after we 3411 // figure out whether the destructor is virtual. 3412 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(NewFD)) 3413 if (!Destructor->getParent()->isDependentType()) 3414 CheckDestructor(Destructor); 3415 3416 // Extra checking for C++ overloaded operators (C++ [over.oper]). 3417 if (NewFD->isOverloadedOperator() && 3418 CheckOverloadedOperatorDeclaration(NewFD)) 3419 return NewFD->setInvalidDecl(); 3420 3421 // Extra checking for C++0x literal operators (C++0x [over.literal]). 3422 if (NewFD->getLiteralIdentifier() && 3423 CheckLiteralOperatorDeclaration(NewFD)) 3424 return NewFD->setInvalidDecl(); 3425 3426 // In C++, check default arguments now that we have merged decls. Unless 3427 // the lexical context is the class, because in this case this is done 3428 // during delayed parsing anyway. 3429 if (!CurContext->isRecord()) 3430 CheckCXXDefaultArguments(NewFD); 3431 } 3432} 3433 3434void Sema::CheckMain(FunctionDecl* FD) { 3435 // C++ [basic.start.main]p3: A program that declares main to be inline 3436 // or static is ill-formed. 3437 // C99 6.7.4p4: In a hosted environment, the inline function specifier 3438 // shall not appear in a declaration of main. 3439 // static main is not an error under C99, but we should warn about it. 3440 bool isInline = FD->isInlineSpecified(); 3441 bool isStatic = FD->getStorageClass() == FunctionDecl::Static; 3442 if (isInline || isStatic) { 3443 unsigned diagID = diag::warn_unusual_main_decl; 3444 if (isInline || getLangOptions().CPlusPlus) 3445 diagID = diag::err_unusual_main_decl; 3446 3447 int which = isStatic + (isInline << 1) - 1; 3448 Diag(FD->getLocation(), diagID) << which; 3449 } 3450 3451 QualType T = FD->getType(); 3452 assert(T->isFunctionType() && "function decl is not of function type"); 3453 const FunctionType* FT = T->getAs<FunctionType>(); 3454 3455 if (!Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) { 3456 // TODO: add a replacement fixit to turn the return type into 'int'. 3457 Diag(FD->getTypeSpecStartLoc(), diag::err_main_returns_nonint); 3458 FD->setInvalidDecl(true); 3459 } 3460 3461 // Treat protoless main() as nullary. 3462 if (isa<FunctionNoProtoType>(FT)) return; 3463 3464 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT); 3465 unsigned nparams = FTP->getNumArgs(); 3466 assert(FD->getNumParams() == nparams); 3467 3468 bool HasExtraParameters = (nparams > 3); 3469 3470 // Darwin passes an undocumented fourth argument of type char**. If 3471 // other platforms start sprouting these, the logic below will start 3472 // getting shifty. 3473 if (nparams == 4 && 3474 Context.Target.getTriple().getOS() == llvm::Triple::Darwin) 3475 HasExtraParameters = false; 3476 3477 if (HasExtraParameters) { 3478 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams; 3479 FD->setInvalidDecl(true); 3480 nparams = 3; 3481 } 3482 3483 // FIXME: a lot of the following diagnostics would be improved 3484 // if we had some location information about types. 3485 3486 QualType CharPP = 3487 Context.getPointerType(Context.getPointerType(Context.CharTy)); 3488 QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP }; 3489 3490 for (unsigned i = 0; i < nparams; ++i) { 3491 QualType AT = FTP->getArgType(i); 3492 3493 bool mismatch = true; 3494 3495 if (Context.hasSameUnqualifiedType(AT, Expected[i])) 3496 mismatch = false; 3497 else if (Expected[i] == CharPP) { 3498 // As an extension, the following forms are okay: 3499 // char const ** 3500 // char const * const * 3501 // char * const * 3502 3503 QualifierCollector qs; 3504 const PointerType* PT; 3505 if ((PT = qs.strip(AT)->getAs<PointerType>()) && 3506 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) && 3507 (QualType(qs.strip(PT->getPointeeType()), 0) == Context.CharTy)) { 3508 qs.removeConst(); 3509 mismatch = !qs.empty(); 3510 } 3511 } 3512 3513 if (mismatch) { 3514 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i]; 3515 // TODO: suggest replacing given type with expected type 3516 FD->setInvalidDecl(true); 3517 } 3518 } 3519 3520 if (nparams == 1 && !FD->isInvalidDecl()) { 3521 Diag(FD->getLocation(), diag::warn_main_one_arg); 3522 } 3523} 3524 3525bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 3526 // FIXME: Need strict checking. In C89, we need to check for 3527 // any assignment, increment, decrement, function-calls, or 3528 // commas outside of a sizeof. In C99, it's the same list, 3529 // except that the aforementioned are allowed in unevaluated 3530 // expressions. Everything else falls under the 3531 // "may accept other forms of constant expressions" exception. 3532 // (We never end up here for C++, so the constant expression 3533 // rules there don't matter.) 3534 if (Init->isConstantInitializer(Context)) 3535 return false; 3536 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 3537 << Init->getSourceRange(); 3538 return true; 3539} 3540 3541void Sema::AddInitializerToDecl(DeclPtrTy dcl, ExprArg init) { 3542 AddInitializerToDecl(dcl, move(init), /*DirectInit=*/false); 3543} 3544 3545/// AddInitializerToDecl - Adds the initializer Init to the 3546/// declaration dcl. If DirectInit is true, this is C++ direct 3547/// initialization rather than copy initialization. 3548void Sema::AddInitializerToDecl(DeclPtrTy dcl, ExprArg init, bool DirectInit) { 3549 Decl *RealDecl = dcl.getAs<Decl>(); 3550 // If there is no declaration, there was an error parsing it. Just ignore 3551 // the initializer. 3552 if (RealDecl == 0) 3553 return; 3554 3555 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 3556 // With declarators parsed the way they are, the parser cannot 3557 // distinguish between a normal initializer and a pure-specifier. 3558 // Thus this grotesque test. 3559 IntegerLiteral *IL; 3560 Expr *Init = static_cast<Expr *>(init.get()); 3561 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 3562 Context.getCanonicalType(IL->getType()) == Context.IntTy) 3563 CheckPureMethod(Method, Init->getSourceRange()); 3564 else { 3565 Diag(Method->getLocation(), diag::err_member_function_initialization) 3566 << Method->getDeclName() << Init->getSourceRange(); 3567 Method->setInvalidDecl(); 3568 } 3569 return; 3570 } 3571 3572 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 3573 if (!VDecl) { 3574 if (getLangOptions().CPlusPlus && 3575 RealDecl->getLexicalDeclContext()->isRecord() && 3576 isa<NamedDecl>(RealDecl)) 3577 Diag(RealDecl->getLocation(), diag::err_member_initialization) 3578 << cast<NamedDecl>(RealDecl)->getDeclName(); 3579 else 3580 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 3581 RealDecl->setInvalidDecl(); 3582 return; 3583 } 3584 3585 // A definition must end up with a complete type, which means it must be 3586 // complete with the restriction that an array type might be completed by the 3587 // initializer; note that later code assumes this restriction. 3588 QualType BaseDeclType = VDecl->getType(); 3589 if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType)) 3590 BaseDeclType = Array->getElementType(); 3591 if (RequireCompleteType(VDecl->getLocation(), BaseDeclType, 3592 diag::err_typecheck_decl_incomplete_type)) { 3593 RealDecl->setInvalidDecl(); 3594 return; 3595 } 3596 3597 // The variable can not have an abstract class type. 3598 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 3599 diag::err_abstract_type_in_decl, 3600 AbstractVariableType)) 3601 VDecl->setInvalidDecl(); 3602 3603 const VarDecl *Def; 3604 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 3605 Diag(VDecl->getLocation(), diag::err_redefinition) 3606 << VDecl->getDeclName(); 3607 Diag(Def->getLocation(), diag::note_previous_definition); 3608 VDecl->setInvalidDecl(); 3609 return; 3610 } 3611 3612 // Take ownership of the expression, now that we're sure we have somewhere 3613 // to put it. 3614 Expr *Init = init.takeAs<Expr>(); 3615 assert(Init && "missing initializer"); 3616 3617 // Capture the variable that is being initialized and the style of 3618 // initialization. 3619 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 3620 3621 // FIXME: Poor source location information. 3622 InitializationKind Kind 3623 = DirectInit? InitializationKind::CreateDirect(VDecl->getLocation(), 3624 Init->getLocStart(), 3625 Init->getLocEnd()) 3626 : InitializationKind::CreateCopy(VDecl->getLocation(), 3627 Init->getLocStart()); 3628 3629 // Get the decls type and save a reference for later, since 3630 // CheckInitializerTypes may change it. 3631 QualType DclT = VDecl->getType(), SavT = DclT; 3632 if (VDecl->isBlockVarDecl()) { 3633 if (VDecl->hasExternalStorage()) { // C99 6.7.8p5 3634 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 3635 VDecl->setInvalidDecl(); 3636 } else if (!VDecl->isInvalidDecl()) { 3637 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 3638 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 3639 MultiExprArg(*this, (void**)&Init, 1), 3640 &DclT); 3641 if (Result.isInvalid()) { 3642 VDecl->setInvalidDecl(); 3643 return; 3644 } 3645 3646 Init = Result.takeAs<Expr>(); 3647 3648 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 3649 // Don't check invalid declarations to avoid emitting useless diagnostics. 3650 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 3651 if (VDecl->getStorageClass() == VarDecl::Static) // C99 6.7.8p4. 3652 CheckForConstantInitializer(Init, DclT); 3653 } 3654 } 3655 } else if (VDecl->isStaticDataMember() && 3656 VDecl->getLexicalDeclContext()->isRecord()) { 3657 // This is an in-class initialization for a static data member, e.g., 3658 // 3659 // struct S { 3660 // static const int value = 17; 3661 // }; 3662 3663 // Attach the initializer 3664 VDecl->setInit(Init); 3665 3666 // C++ [class.mem]p4: 3667 // A member-declarator can contain a constant-initializer only 3668 // if it declares a static member (9.4) of const integral or 3669 // const enumeration type, see 9.4.2. 3670 QualType T = VDecl->getType(); 3671 if (!T->isDependentType() && 3672 (!Context.getCanonicalType(T).isConstQualified() || 3673 !T->isIntegralType())) { 3674 Diag(VDecl->getLocation(), diag::err_member_initialization) 3675 << VDecl->getDeclName() << Init->getSourceRange(); 3676 VDecl->setInvalidDecl(); 3677 } else { 3678 // C++ [class.static.data]p4: 3679 // If a static data member is of const integral or const 3680 // enumeration type, its declaration in the class definition 3681 // can specify a constant-initializer which shall be an 3682 // integral constant expression (5.19). 3683 if (!Init->isTypeDependent() && 3684 !Init->getType()->isIntegralType()) { 3685 // We have a non-dependent, non-integral or enumeration type. 3686 Diag(Init->getSourceRange().getBegin(), 3687 diag::err_in_class_initializer_non_integral_type) 3688 << Init->getType() << Init->getSourceRange(); 3689 VDecl->setInvalidDecl(); 3690 } else if (!Init->isTypeDependent() && !Init->isValueDependent()) { 3691 // Check whether the expression is a constant expression. 3692 llvm::APSInt Value; 3693 SourceLocation Loc; 3694 if (!Init->isIntegerConstantExpr(Value, Context, &Loc)) { 3695 Diag(Loc, diag::err_in_class_initializer_non_constant) 3696 << Init->getSourceRange(); 3697 VDecl->setInvalidDecl(); 3698 } else if (!VDecl->getType()->isDependentType()) 3699 ImpCastExprToType(Init, VDecl->getType(), CastExpr::CK_IntegralCast); 3700 } 3701 } 3702 } else if (VDecl->isFileVarDecl()) { 3703 if (VDecl->getStorageClass() == VarDecl::Extern) 3704 Diag(VDecl->getLocation(), diag::warn_extern_init); 3705 if (!VDecl->isInvalidDecl()) { 3706 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 3707 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 3708 MultiExprArg(*this, (void**)&Init, 1), 3709 &DclT); 3710 if (Result.isInvalid()) { 3711 VDecl->setInvalidDecl(); 3712 return; 3713 } 3714 3715 Init = Result.takeAs<Expr>(); 3716 } 3717 3718 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 3719 // Don't check invalid declarations to avoid emitting useless diagnostics. 3720 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 3721 // C99 6.7.8p4. All file scoped initializers need to be constant. 3722 CheckForConstantInitializer(Init, DclT); 3723 } 3724 } 3725 // If the type changed, it means we had an incomplete type that was 3726 // completed by the initializer. For example: 3727 // int ary[] = { 1, 3, 5 }; 3728 // "ary" transitions from a VariableArrayType to a ConstantArrayType. 3729 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 3730 VDecl->setType(DclT); 3731 Init->setType(DclT); 3732 } 3733 3734 Init = MaybeCreateCXXExprWithTemporaries(Init); 3735 // Attach the initializer to the decl. 3736 VDecl->setInit(Init); 3737 3738 if (getLangOptions().CPlusPlus) { 3739 // Make sure we mark the destructor as used if necessary. 3740 QualType InitType = VDecl->getType(); 3741 while (const ArrayType *Array = Context.getAsArrayType(InitType)) 3742 InitType = Context.getBaseElementType(Array); 3743 if (const RecordType *Record = InitType->getAs<RecordType>()) 3744 FinalizeVarWithDestructor(VDecl, Record); 3745 } 3746 3747 return; 3748} 3749 3750void Sema::ActOnUninitializedDecl(DeclPtrTy dcl, 3751 bool TypeContainsUndeducedAuto) { 3752 Decl *RealDecl = dcl.getAs<Decl>(); 3753 3754 // If there is no declaration, there was an error parsing it. Just ignore it. 3755 if (RealDecl == 0) 3756 return; 3757 3758 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 3759 QualType Type = Var->getType(); 3760 3761 // C++0x [dcl.spec.auto]p3 3762 if (TypeContainsUndeducedAuto) { 3763 Diag(Var->getLocation(), diag::err_auto_var_requires_init) 3764 << Var->getDeclName() << Type; 3765 Var->setInvalidDecl(); 3766 return; 3767 } 3768 3769 switch (Var->isThisDeclarationADefinition()) { 3770 case VarDecl::Definition: 3771 if (!Var->isStaticDataMember() || !Var->getAnyInitializer()) 3772 break; 3773 3774 // We have an out-of-line definition of a static data member 3775 // that has an in-class initializer, so we type-check this like 3776 // a declaration. 3777 // 3778 // Fall through 3779 3780 case VarDecl::DeclarationOnly: 3781 // It's only a declaration. 3782 3783 // Block scope. C99 6.7p7: If an identifier for an object is 3784 // declared with no linkage (C99 6.2.2p6), the type for the 3785 // object shall be complete. 3786 if (!Type->isDependentType() && Var->isBlockVarDecl() && 3787 !Var->getLinkage() && !Var->isInvalidDecl() && 3788 RequireCompleteType(Var->getLocation(), Type, 3789 diag::err_typecheck_decl_incomplete_type)) 3790 Var->setInvalidDecl(); 3791 3792 // Make sure that the type is not abstract. 3793 if (!Type->isDependentType() && !Var->isInvalidDecl() && 3794 RequireNonAbstractType(Var->getLocation(), Type, 3795 diag::err_abstract_type_in_decl, 3796 AbstractVariableType)) 3797 Var->setInvalidDecl(); 3798 return; 3799 3800 case VarDecl::TentativeDefinition: 3801 // File scope. C99 6.9.2p2: A declaration of an identifier for an 3802 // object that has file scope without an initializer, and without a 3803 // storage-class specifier or with the storage-class specifier "static", 3804 // constitutes a tentative definition. Note: A tentative definition with 3805 // external linkage is valid (C99 6.2.2p5). 3806 if (!Var->isInvalidDecl()) { 3807 if (const IncompleteArrayType *ArrayT 3808 = Context.getAsIncompleteArrayType(Type)) { 3809 if (RequireCompleteType(Var->getLocation(), 3810 ArrayT->getElementType(), 3811 diag::err_illegal_decl_array_incomplete_type)) 3812 Var->setInvalidDecl(); 3813 } else if (Var->getStorageClass() == VarDecl::Static) { 3814 // C99 6.9.2p3: If the declaration of an identifier for an object is 3815 // a tentative definition and has internal linkage (C99 6.2.2p3), the 3816 // declared type shall not be an incomplete type. 3817 // NOTE: code such as the following 3818 // static struct s; 3819 // struct s { int a; }; 3820 // is accepted by gcc. Hence here we issue a warning instead of 3821 // an error and we do not invalidate the static declaration. 3822 // NOTE: to avoid multiple warnings, only check the first declaration. 3823 if (Var->getPreviousDeclaration() == 0) 3824 RequireCompleteType(Var->getLocation(), Type, 3825 diag::ext_typecheck_decl_incomplete_type); 3826 } 3827 } 3828 3829 // Record the tentative definition; we're done. 3830 if (!Var->isInvalidDecl()) 3831 TentativeDefinitions.push_back(Var); 3832 return; 3833 } 3834 3835 // Provide a specific diagnostic for uninitialized variable 3836 // definitions with incomplete array type. 3837 if (Type->isIncompleteArrayType()) { 3838 Diag(Var->getLocation(), 3839 diag::err_typecheck_incomplete_array_needs_initializer); 3840 Var->setInvalidDecl(); 3841 return; 3842 } 3843 3844 // Provide a specific diagnostic for uninitialized variable 3845 // definitions with reference type. 3846 if (Type->isReferenceType()) { 3847 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 3848 << Var->getDeclName() 3849 << SourceRange(Var->getLocation(), Var->getLocation()); 3850 Var->setInvalidDecl(); 3851 return; 3852 } 3853 3854 // Do not attempt to type-check the default initializer for a 3855 // variable with dependent type. 3856 if (Type->isDependentType()) 3857 return; 3858 3859 if (Var->isInvalidDecl()) 3860 return; 3861 3862 if (RequireCompleteType(Var->getLocation(), 3863 Context.getBaseElementType(Type), 3864 diag::err_typecheck_decl_incomplete_type)) { 3865 Var->setInvalidDecl(); 3866 return; 3867 } 3868 3869 // The variable can not have an abstract class type. 3870 if (RequireNonAbstractType(Var->getLocation(), Type, 3871 diag::err_abstract_type_in_decl, 3872 AbstractVariableType)) { 3873 Var->setInvalidDecl(); 3874 return; 3875 } 3876 3877 const RecordType *Record 3878 = Context.getBaseElementType(Type)->getAs<RecordType>(); 3879 if (Record && getLangOptions().CPlusPlus && !getLangOptions().CPlusPlus0x && 3880 cast<CXXRecordDecl>(Record->getDecl())->isPOD()) { 3881 // C++03 [dcl.init]p9: 3882 // If no initializer is specified for an object, and the 3883 // object is of (possibly cv-qualified) non-POD class type (or 3884 // array thereof), the object shall be default-initialized; if 3885 // the object is of const-qualified type, the underlying class 3886 // type shall have a user-declared default 3887 // constructor. Otherwise, if no initializer is specified for 3888 // a non- static object, the object and its subobjects, if 3889 // any, have an indeterminate initial value); if the object 3890 // or any of its subobjects are of const-qualified type, the 3891 // program is ill-formed. 3892 // FIXME: DPG thinks it is very fishy that C++0x disables this. 3893 } else { 3894 InitializedEntity Entity = InitializedEntity::InitializeVariable(Var); 3895 InitializationKind Kind 3896 = InitializationKind::CreateDefault(Var->getLocation()); 3897 3898 InitializationSequence InitSeq(*this, Entity, Kind, 0, 0); 3899 OwningExprResult Init = InitSeq.Perform(*this, Entity, Kind, 3900 MultiExprArg(*this, 0, 0)); 3901 if (Init.isInvalid()) 3902 Var->setInvalidDecl(); 3903 else if (Init.get()) 3904 Var->setInit(MaybeCreateCXXExprWithTemporaries(Init.takeAs<Expr>())); 3905 } 3906 3907 if (!Var->isInvalidDecl() && getLangOptions().CPlusPlus && Record) 3908 FinalizeVarWithDestructor(Var, Record); 3909 } 3910} 3911 3912Sema::DeclGroupPtrTy Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, 3913 DeclPtrTy *Group, 3914 unsigned NumDecls) { 3915 llvm::SmallVector<Decl*, 8> Decls; 3916 3917 if (DS.isTypeSpecOwned()) 3918 Decls.push_back((Decl*)DS.getTypeRep()); 3919 3920 for (unsigned i = 0; i != NumDecls; ++i) 3921 if (Decl *D = Group[i].getAs<Decl>()) 3922 Decls.push_back(D); 3923 3924 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, 3925 Decls.data(), Decls.size())); 3926} 3927 3928 3929/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 3930/// to introduce parameters into function prototype scope. 3931Sema::DeclPtrTy 3932Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 3933 const DeclSpec &DS = D.getDeclSpec(); 3934 3935 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 3936 VarDecl::StorageClass StorageClass = VarDecl::None; 3937 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 3938 StorageClass = VarDecl::Register; 3939 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 3940 Diag(DS.getStorageClassSpecLoc(), 3941 diag::err_invalid_storage_class_in_func_decl); 3942 D.getMutableDeclSpec().ClearStorageClassSpecs(); 3943 } 3944 3945 if (D.getDeclSpec().isThreadSpecified()) 3946 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 3947 3948 DiagnoseFunctionSpecifiers(D); 3949 3950 // Check that there are no default arguments inside the type of this 3951 // parameter (C++ only). 3952 if (getLangOptions().CPlusPlus) 3953 CheckExtraCXXDefaultArguments(D); 3954 3955 TypeSourceInfo *TInfo = 0; 3956 TagDecl *OwnedDecl = 0; 3957 QualType parmDeclType = GetTypeForDeclarator(D, S, &TInfo, &OwnedDecl); 3958 3959 if (getLangOptions().CPlusPlus && OwnedDecl && OwnedDecl->isDefinition()) { 3960 // C++ [dcl.fct]p6: 3961 // Types shall not be defined in return or parameter types. 3962 Diag(OwnedDecl->getLocation(), diag::err_type_defined_in_param_type) 3963 << Context.getTypeDeclType(OwnedDecl); 3964 } 3965 3966 // Check for redeclaration of parameters, e.g. int foo(int x, int x); 3967 IdentifierInfo *II = D.getIdentifier(); 3968 if (II) { 3969 LookupResult R(*this, II, D.getIdentifierLoc(), LookupOrdinaryName, 3970 ForRedeclaration); 3971 LookupName(R, S); 3972 if (R.isSingleResult()) { 3973 NamedDecl *PrevDecl = R.getFoundDecl(); 3974 if (PrevDecl->isTemplateParameter()) { 3975 // Maybe we will complain about the shadowed template parameter. 3976 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 3977 // Just pretend that we didn't see the previous declaration. 3978 PrevDecl = 0; 3979 } else if (S->isDeclScope(DeclPtrTy::make(PrevDecl))) { 3980 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 3981 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 3982 3983 // Recover by removing the name 3984 II = 0; 3985 D.SetIdentifier(0, D.getIdentifierLoc()); 3986 D.setInvalidType(true); 3987 } else { 3988 DiagnoseShadow(S, D, R); 3989 } 3990 } 3991 } 3992 3993 // Parameters can not be abstract class types. 3994 // For record types, this is done by the AbstractClassUsageDiagnoser once 3995 // the class has been completely parsed. 3996 if (!CurContext->isRecord() && 3997 RequireNonAbstractType(D.getIdentifierLoc(), parmDeclType, 3998 diag::err_abstract_type_in_decl, 3999 AbstractParamType)) 4000 D.setInvalidType(true); 4001 4002 QualType T = adjustParameterType(parmDeclType); 4003 4004 // Temporarily put parameter variables in the translation unit, not 4005 // the enclosing context. This prevents them from accidentally 4006 // looking like class members in C++. 4007 DeclContext *DC = Context.getTranslationUnitDecl(); 4008 4009 ParmVarDecl *New 4010 = ParmVarDecl::Create(Context, DC, D.getIdentifierLoc(), II, 4011 T, TInfo, StorageClass, 0); 4012 4013 if (D.isInvalidType()) 4014 New->setInvalidDecl(); 4015 4016 // Parameter declarators cannot be interface types. All ObjC objects are 4017 // passed by reference. 4018 if (T->isObjCInterfaceType()) { 4019 Diag(D.getIdentifierLoc(), 4020 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T; 4021 New->setInvalidDecl(); 4022 } 4023 4024 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 4025 if (D.getCXXScopeSpec().isSet()) { 4026 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 4027 << D.getCXXScopeSpec().getRange(); 4028 New->setInvalidDecl(); 4029 } 4030 4031 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage 4032 // duration shall not be qualified by an address-space qualifier." 4033 // Since all parameters have automatic store duration, they can not have 4034 // an address space. 4035 if (T.getAddressSpace() != 0) { 4036 Diag(D.getIdentifierLoc(), 4037 diag::err_arg_with_address_space); 4038 New->setInvalidDecl(); 4039 } 4040 4041 4042 // Add the parameter declaration into this scope. 4043 S->AddDecl(DeclPtrTy::make(New)); 4044 if (II) 4045 IdResolver.AddDecl(New); 4046 4047 ProcessDeclAttributes(S, New, D); 4048 4049 if (New->hasAttr<BlocksAttr>()) { 4050 Diag(New->getLocation(), diag::err_block_on_nonlocal); 4051 } 4052 return DeclPtrTy::make(New); 4053} 4054 4055void Sema::ActOnObjCCatchParam(DeclPtrTy D) { 4056 ParmVarDecl *Param = cast<ParmVarDecl>(D.getAs<Decl>()); 4057 Param->setDeclContext(CurContext); 4058} 4059 4060void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 4061 SourceLocation LocAfterDecls) { 4062 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 4063 "Not a function declarator!"); 4064 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 4065 4066 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 4067 // for a K&R function. 4068 if (!FTI.hasPrototype) { 4069 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 4070 --i; 4071 if (FTI.ArgInfo[i].Param == 0) { 4072 llvm::SmallString<256> Code; 4073 llvm::raw_svector_ostream(Code) << " int " 4074 << FTI.ArgInfo[i].Ident->getName() 4075 << ";\n"; 4076 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 4077 << FTI.ArgInfo[i].Ident 4078 << CodeModificationHint::CreateInsertion(LocAfterDecls, Code.str()); 4079 4080 // Implicitly declare the argument as type 'int' for lack of a better 4081 // type. 4082 DeclSpec DS; 4083 const char* PrevSpec; // unused 4084 unsigned DiagID; // unused 4085 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 4086 PrevSpec, DiagID); 4087 Declarator ParamD(DS, Declarator::KNRTypeListContext); 4088 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 4089 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 4090 } 4091 } 4092 } 4093} 4094 4095Sema::DeclPtrTy Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, 4096 Declarator &D) { 4097 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 4098 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 4099 "Not a function declarator!"); 4100 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 4101 4102 if (FTI.hasPrototype) { 4103 // FIXME: Diagnose arguments without names in C. 4104 } 4105 4106 Scope *ParentScope = FnBodyScope->getParent(); 4107 4108 DeclPtrTy DP = HandleDeclarator(ParentScope, D, 4109 MultiTemplateParamsArg(*this), 4110 /*IsFunctionDefinition=*/true); 4111 return ActOnStartOfFunctionDef(FnBodyScope, DP); 4112} 4113 4114static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD) { 4115 // Don't warn about invalid declarations. 4116 if (FD->isInvalidDecl()) 4117 return false; 4118 4119 // Or declarations that aren't global. 4120 if (!FD->isGlobal()) 4121 return false; 4122 4123 // Don't warn about C++ member functions. 4124 if (isa<CXXMethodDecl>(FD)) 4125 return false; 4126 4127 // Don't warn about 'main'. 4128 if (FD->isMain()) 4129 return false; 4130 4131 // Don't warn about inline functions. 4132 if (FD->isInlineSpecified()) 4133 return false; 4134 4135 // Don't warn about function templates. 4136 if (FD->getDescribedFunctionTemplate()) 4137 return false; 4138 4139 // Don't warn about function template specializations. 4140 if (FD->isFunctionTemplateSpecialization()) 4141 return false; 4142 4143 bool MissingPrototype = true; 4144 for (const FunctionDecl *Prev = FD->getPreviousDeclaration(); 4145 Prev; Prev = Prev->getPreviousDeclaration()) { 4146 // Ignore any declarations that occur in function or method 4147 // scope, because they aren't visible from the header. 4148 if (Prev->getDeclContext()->isFunctionOrMethod()) 4149 continue; 4150 4151 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 4152 break; 4153 } 4154 4155 return MissingPrototype; 4156} 4157 4158Sema::DeclPtrTy Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, DeclPtrTy D) { 4159 // Clear the last template instantiation error context. 4160 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation(); 4161 4162 if (!D) 4163 return D; 4164 FunctionDecl *FD = 0; 4165 4166 if (FunctionTemplateDecl *FunTmpl 4167 = dyn_cast<FunctionTemplateDecl>(D.getAs<Decl>())) 4168 FD = FunTmpl->getTemplatedDecl(); 4169 else 4170 FD = cast<FunctionDecl>(D.getAs<Decl>()); 4171 4172 // Enter a new function scope 4173 PushFunctionScope(); 4174 4175 // See if this is a redefinition. 4176 // But don't complain if we're in GNU89 mode and the previous definition 4177 // was an extern inline function. 4178 const FunctionDecl *Definition; 4179 if (FD->getBody(Definition) && 4180 !canRedefineFunction(Definition, getLangOptions())) { 4181 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 4182 Diag(Definition->getLocation(), diag::note_previous_definition); 4183 } 4184 4185 // Builtin functions cannot be defined. 4186 if (unsigned BuiltinID = FD->getBuiltinID()) { 4187 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 4188 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 4189 FD->setInvalidDecl(); 4190 } 4191 } 4192 4193 // The return type of a function definition must be complete 4194 // (C99 6.9.1p3, C++ [dcl.fct]p6). 4195 QualType ResultType = FD->getResultType(); 4196 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 4197 !FD->isInvalidDecl() && 4198 RequireCompleteType(FD->getLocation(), ResultType, 4199 diag::err_func_def_incomplete_result)) 4200 FD->setInvalidDecl(); 4201 4202 // GNU warning -Wmissing-prototypes: 4203 // Warn if a global function is defined without a previous 4204 // prototype declaration. This warning is issued even if the 4205 // definition itself provides a prototype. The aim is to detect 4206 // global functions that fail to be declared in header files. 4207 if (ShouldWarnAboutMissingPrototype(FD)) 4208 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 4209 4210 if (FnBodyScope) 4211 PushDeclContext(FnBodyScope, FD); 4212 4213 // Check the validity of our function parameters 4214 CheckParmsForFunctionDef(FD); 4215 4216 // Introduce our parameters into the function scope 4217 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 4218 ParmVarDecl *Param = FD->getParamDecl(p); 4219 Param->setOwningFunction(FD); 4220 4221 // If this has an identifier, add it to the scope stack. 4222 if (Param->getIdentifier() && FnBodyScope) 4223 PushOnScopeChains(Param, FnBodyScope); 4224 } 4225 4226 // Checking attributes of current function definition 4227 // dllimport attribute. 4228 if (FD->getAttr<DLLImportAttr>() && 4229 (!FD->getAttr<DLLExportAttr>())) { 4230 // dllimport attribute cannot be applied to definition. 4231 if (!(FD->getAttr<DLLImportAttr>())->isInherited()) { 4232 Diag(FD->getLocation(), 4233 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 4234 << "dllimport"; 4235 FD->setInvalidDecl(); 4236 return DeclPtrTy::make(FD); 4237 } 4238 4239 // Visual C++ appears to not think this is an issue, so only issue 4240 // a warning when Microsoft extensions are disabled. 4241 if (!LangOpts.Microsoft) { 4242 // If a symbol previously declared dllimport is later defined, the 4243 // attribute is ignored in subsequent references, and a warning is 4244 // emitted. 4245 Diag(FD->getLocation(), 4246 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 4247 << FD->getNameAsCString() << "dllimport"; 4248 } 4249 } 4250 return DeclPtrTy::make(FD); 4251} 4252 4253Sema::DeclPtrTy Sema::ActOnFinishFunctionBody(DeclPtrTy D, StmtArg BodyArg) { 4254 return ActOnFinishFunctionBody(D, move(BodyArg), false); 4255} 4256 4257Sema::DeclPtrTy Sema::ActOnFinishFunctionBody(DeclPtrTy D, StmtArg BodyArg, 4258 bool IsInstantiation) { 4259 Decl *dcl = D.getAs<Decl>(); 4260 Stmt *Body = BodyArg.takeAs<Stmt>(); 4261 4262 // Don't generate EH edges for CallExprs as we'd like to avoid the n^2 4263 // explosion for destrutors that can result and the compile time hit. 4264 AnalysisContext AC(dcl, false); 4265 FunctionDecl *FD = 0; 4266 FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl); 4267 if (FunTmpl) 4268 FD = FunTmpl->getTemplatedDecl(); 4269 else 4270 FD = dyn_cast_or_null<FunctionDecl>(dcl); 4271 4272 if (FD) { 4273 FD->setBody(Body); 4274 if (FD->isMain()) 4275 // C and C++ allow for main to automagically return 0. 4276 // Implements C++ [basic.start.main]p5 and C99 5.1.2.2.3. 4277 FD->setHasImplicitReturnZero(true); 4278 else 4279 CheckFallThroughForFunctionDef(FD, Body, AC); 4280 4281 if (!FD->isInvalidDecl()) 4282 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end()); 4283 4284 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FD)) 4285 MaybeMarkVirtualMembersReferenced(Method->getLocation(), Method); 4286 4287 assert(FD == getCurFunctionDecl() && "Function parsing confused"); 4288 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 4289 assert(MD == getCurMethodDecl() && "Method parsing confused"); 4290 MD->setBody(Body); 4291 CheckFallThroughForFunctionDef(MD, Body, AC); 4292 MD->setEndLoc(Body->getLocEnd()); 4293 4294 if (!MD->isInvalidDecl()) 4295 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end()); 4296 } else { 4297 Body->Destroy(Context); 4298 return DeclPtrTy(); 4299 } 4300 if (!IsInstantiation) 4301 PopDeclContext(); 4302 4303 // Verify and clean out per-function state. 4304 4305 // Check goto/label use. 4306 for (llvm::DenseMap<IdentifierInfo*, LabelStmt*>::iterator 4307 I = getLabelMap().begin(), E = getLabelMap().end(); I != E; ++I) { 4308 LabelStmt *L = I->second; 4309 4310 // Verify that we have no forward references left. If so, there was a goto 4311 // or address of a label taken, but no definition of it. Label fwd 4312 // definitions are indicated with a null substmt. 4313 if (L->getSubStmt() != 0) 4314 continue; 4315 4316 // Emit error. 4317 Diag(L->getIdentLoc(), diag::err_undeclared_label_use) << L->getName(); 4318 4319 // At this point, we have gotos that use the bogus label. Stitch it into 4320 // the function body so that they aren't leaked and that the AST is well 4321 // formed. 4322 if (Body == 0) { 4323 // The whole function wasn't parsed correctly, just delete this. 4324 L->Destroy(Context); 4325 continue; 4326 } 4327 4328 // Otherwise, the body is valid: we want to stitch the label decl into the 4329 // function somewhere so that it is properly owned and so that the goto 4330 // has a valid target. Do this by creating a new compound stmt with the 4331 // label in it. 4332 4333 // Give the label a sub-statement. 4334 L->setSubStmt(new (Context) NullStmt(L->getIdentLoc())); 4335 4336 CompoundStmt *Compound = isa<CXXTryStmt>(Body) ? 4337 cast<CXXTryStmt>(Body)->getTryBlock() : 4338 cast<CompoundStmt>(Body); 4339 llvm::SmallVector<Stmt*, 64> Elements(Compound->body_begin(), 4340 Compound->body_end()); 4341 Elements.push_back(L); 4342 Compound->setStmts(Context, Elements.data(), Elements.size()); 4343 } 4344 4345 if (Body) { 4346 CheckUnreachable(AC); 4347 4348 // C++ constructors that have function-try-blocks can't have return 4349 // statements in the handlers of that block. (C++ [except.handle]p14) 4350 // Verify this. 4351 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body)) 4352 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); 4353 4354 // Verify that that gotos and switch cases don't jump into scopes illegally. 4355 // Verify that that gotos and switch cases don't jump into scopes illegally. 4356 if (FunctionNeedsScopeChecking() && !hasAnyErrorsInThisFunction()) 4357 DiagnoseInvalidJumps(Body); 4358 4359 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) 4360 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 4361 Destructor->getParent()); 4362 4363 // If any errors have occurred, clear out any temporaries that may have 4364 // been leftover. This ensures that these temporaries won't be picked up for 4365 // deletion in some later function. 4366 if (PP.getDiagnostics().hasErrorOccurred()) 4367 ExprTemporaries.clear(); 4368 4369 assert(ExprTemporaries.empty() && "Leftover temporaries in function"); 4370 } 4371 4372 PopFunctionOrBlockScope(); 4373 4374 // If any errors have occurred, clear out any temporaries that may have 4375 // been leftover. This ensures that these temporaries won't be picked up for 4376 // deletion in some later function. 4377 if (getDiagnostics().hasErrorOccurred()) 4378 ExprTemporaries.clear(); 4379 4380 return D; 4381} 4382 4383/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 4384/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 4385NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 4386 IdentifierInfo &II, Scope *S) { 4387 // Before we produce a declaration for an implicitly defined 4388 // function, see whether there was a locally-scoped declaration of 4389 // this name as a function or variable. If so, use that 4390 // (non-visible) declaration, and complain about it. 4391 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 4392 = LocallyScopedExternalDecls.find(&II); 4393 if (Pos != LocallyScopedExternalDecls.end()) { 4394 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 4395 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 4396 return Pos->second; 4397 } 4398 4399 // Extension in C99. Legal in C90, but warn about it. 4400 if (II.getName().startswith("__builtin_")) 4401 Diag(Loc, diag::warn_builtin_unknown) << &II; 4402 else if (getLangOptions().C99) 4403 Diag(Loc, diag::ext_implicit_function_decl) << &II; 4404 else 4405 Diag(Loc, diag::warn_implicit_function_decl) << &II; 4406 4407 // Set a Declarator for the implicit definition: int foo(); 4408 const char *Dummy; 4409 DeclSpec DS; 4410 unsigned DiagID; 4411 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID); 4412 Error = Error; // Silence warning. 4413 assert(!Error && "Error setting up implicit decl!"); 4414 Declarator D(DS, Declarator::BlockContext); 4415 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0, 4416 0, 0, false, SourceLocation(), 4417 false, 0,0,0, Loc, Loc, D), 4418 SourceLocation()); 4419 D.SetIdentifier(&II, Loc); 4420 4421 // Insert this function into translation-unit scope. 4422 4423 DeclContext *PrevDC = CurContext; 4424 CurContext = Context.getTranslationUnitDecl(); 4425 4426 FunctionDecl *FD = 4427 dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D).getAs<Decl>()); 4428 FD->setImplicit(); 4429 4430 CurContext = PrevDC; 4431 4432 AddKnownFunctionAttributes(FD); 4433 4434 return FD; 4435} 4436 4437/// \brief Adds any function attributes that we know a priori based on 4438/// the declaration of this function. 4439/// 4440/// These attributes can apply both to implicitly-declared builtins 4441/// (like __builtin___printf_chk) or to library-declared functions 4442/// like NSLog or printf. 4443void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 4444 if (FD->isInvalidDecl()) 4445 return; 4446 4447 // If this is a built-in function, map its builtin attributes to 4448 // actual attributes. 4449 if (unsigned BuiltinID = FD->getBuiltinID()) { 4450 // Handle printf-formatting attributes. 4451 unsigned FormatIdx; 4452 bool HasVAListArg; 4453 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 4454 if (!FD->getAttr<FormatAttr>()) 4455 FD->addAttr(::new (Context) FormatAttr(Context, "printf", FormatIdx+1, 4456 HasVAListArg ? 0 : FormatIdx+2)); 4457 } 4458 4459 // Mark const if we don't care about errno and that is the only 4460 // thing preventing the function from being const. This allows 4461 // IRgen to use LLVM intrinsics for such functions. 4462 if (!getLangOptions().MathErrno && 4463 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 4464 if (!FD->getAttr<ConstAttr>()) 4465 FD->addAttr(::new (Context) ConstAttr()); 4466 } 4467 4468 if (Context.BuiltinInfo.isNoReturn(BuiltinID)) 4469 FD->setType(Context.getNoReturnType(FD->getType())); 4470 if (Context.BuiltinInfo.isNoThrow(BuiltinID)) 4471 FD->addAttr(::new (Context) NoThrowAttr()); 4472 if (Context.BuiltinInfo.isConst(BuiltinID)) 4473 FD->addAttr(::new (Context) ConstAttr()); 4474 } 4475 4476 IdentifierInfo *Name = FD->getIdentifier(); 4477 if (!Name) 4478 return; 4479 if ((!getLangOptions().CPlusPlus && 4480 FD->getDeclContext()->isTranslationUnit()) || 4481 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 4482 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 4483 LinkageSpecDecl::lang_c)) { 4484 // Okay: this could be a libc/libm/Objective-C function we know 4485 // about. 4486 } else 4487 return; 4488 4489 if (Name->isStr("NSLog") || Name->isStr("NSLogv")) { 4490 // FIXME: NSLog and NSLogv should be target specific 4491 if (const FormatAttr *Format = FD->getAttr<FormatAttr>()) { 4492 // FIXME: We known better than our headers. 4493 const_cast<FormatAttr *>(Format)->setType(Context, "printf"); 4494 } else 4495 FD->addAttr(::new (Context) FormatAttr(Context, "printf", 1, 4496 Name->isStr("NSLogv") ? 0 : 2)); 4497 } else if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { 4498 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be 4499 // target-specific builtins, perhaps? 4500 if (!FD->getAttr<FormatAttr>()) 4501 FD->addAttr(::new (Context) FormatAttr(Context, "printf", 2, 4502 Name->isStr("vasprintf") ? 0 : 3)); 4503 } 4504} 4505 4506TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 4507 TypeSourceInfo *TInfo) { 4508 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 4509 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 4510 4511 if (!TInfo) { 4512 assert(D.isInvalidType() && "no declarator info for valid type"); 4513 TInfo = Context.getTrivialTypeSourceInfo(T); 4514 } 4515 4516 // Scope manipulation handled by caller. 4517 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 4518 D.getIdentifierLoc(), 4519 D.getIdentifier(), 4520 TInfo); 4521 4522 if (const TagType *TT = T->getAs<TagType>()) { 4523 TagDecl *TD = TT->getDecl(); 4524 4525 // If the TagDecl that the TypedefDecl points to is an anonymous decl 4526 // keep track of the TypedefDecl. 4527 if (!TD->getIdentifier() && !TD->getTypedefForAnonDecl()) 4528 TD->setTypedefForAnonDecl(NewTD); 4529 } 4530 4531 if (D.isInvalidType()) 4532 NewTD->setInvalidDecl(); 4533 return NewTD; 4534} 4535 4536 4537/// \brief Determine whether a tag with a given kind is acceptable 4538/// as a redeclaration of the given tag declaration. 4539/// 4540/// \returns true if the new tag kind is acceptable, false otherwise. 4541bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, 4542 TagDecl::TagKind NewTag, 4543 SourceLocation NewTagLoc, 4544 const IdentifierInfo &Name) { 4545 // C++ [dcl.type.elab]p3: 4546 // The class-key or enum keyword present in the 4547 // elaborated-type-specifier shall agree in kind with the 4548 // declaration to which the name in theelaborated-type-specifier 4549 // refers. This rule also applies to the form of 4550 // elaborated-type-specifier that declares a class-name or 4551 // friend class since it can be construed as referring to the 4552 // definition of the class. Thus, in any 4553 // elaborated-type-specifier, the enum keyword shall be used to 4554 // refer to an enumeration (7.2), the union class-keyshall be 4555 // used to refer to a union (clause 9), and either the class or 4556 // struct class-key shall be used to refer to a class (clause 9) 4557 // declared using the class or struct class-key. 4558 TagDecl::TagKind OldTag = Previous->getTagKind(); 4559 if (OldTag == NewTag) 4560 return true; 4561 4562 if ((OldTag == TagDecl::TK_struct || OldTag == TagDecl::TK_class) && 4563 (NewTag == TagDecl::TK_struct || NewTag == TagDecl::TK_class)) { 4564 // Warn about the struct/class tag mismatch. 4565 bool isTemplate = false; 4566 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) 4567 isTemplate = Record->getDescribedClassTemplate(); 4568 4569 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 4570 << (NewTag == TagDecl::TK_class) 4571 << isTemplate << &Name 4572 << CodeModificationHint::CreateReplacement(SourceRange(NewTagLoc), 4573 OldTag == TagDecl::TK_class? "class" : "struct"); 4574 Diag(Previous->getLocation(), diag::note_previous_use); 4575 return true; 4576 } 4577 return false; 4578} 4579 4580/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 4581/// former case, Name will be non-null. In the later case, Name will be null. 4582/// TagSpec indicates what kind of tag this is. TUK indicates whether this is a 4583/// reference/declaration/definition of a tag. 4584Sema::DeclPtrTy Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK, 4585 SourceLocation KWLoc, const CXXScopeSpec &SS, 4586 IdentifierInfo *Name, SourceLocation NameLoc, 4587 AttributeList *Attr, AccessSpecifier AS, 4588 MultiTemplateParamsArg TemplateParameterLists, 4589 bool &OwnedDecl, bool &IsDependent) { 4590 // If this is not a definition, it must have a name. 4591 assert((Name != 0 || TUK == TUK_Definition) && 4592 "Nameless record must be a definition!"); 4593 4594 OwnedDecl = false; 4595 TagDecl::TagKind Kind = TagDecl::getTagKindForTypeSpec(TagSpec); 4596 4597 // FIXME: Check explicit specializations more carefully. 4598 bool isExplicitSpecialization = false; 4599 if (TUK != TUK_Reference) { 4600 if (TemplateParameterList *TemplateParams 4601 = MatchTemplateParametersToScopeSpecifier(KWLoc, SS, 4602 (TemplateParameterList**)TemplateParameterLists.get(), 4603 TemplateParameterLists.size(), 4604 isExplicitSpecialization)) { 4605 if (TemplateParams->size() > 0) { 4606 // This is a declaration or definition of a class template (which may 4607 // be a member of another template). 4608 OwnedDecl = false; 4609 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc, 4610 SS, Name, NameLoc, Attr, 4611 TemplateParams, 4612 AS); 4613 TemplateParameterLists.release(); 4614 return Result.get(); 4615 } else { 4616 // The "template<>" header is extraneous. 4617 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 4618 << ElaboratedType::getNameForTagKind(Kind) << Name; 4619 isExplicitSpecialization = true; 4620 } 4621 } 4622 4623 TemplateParameterLists.release(); 4624 } 4625 4626 DeclContext *SearchDC = CurContext; 4627 DeclContext *DC = CurContext; 4628 bool isStdBadAlloc = false; 4629 bool Invalid = false; 4630 4631 RedeclarationKind Redecl = ForRedeclaration; 4632 if (TUK == TUK_Friend || TUK == TUK_Reference) 4633 Redecl = NotForRedeclaration; 4634 4635 LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl); 4636 4637 if (Name && SS.isNotEmpty()) { 4638 // We have a nested-name tag ('struct foo::bar'). 4639 4640 // Check for invalid 'foo::'. 4641 if (SS.isInvalid()) { 4642 Name = 0; 4643 goto CreateNewDecl; 4644 } 4645 4646 // If this is a friend or a reference to a class in a dependent 4647 // context, don't try to make a decl for it. 4648 if (TUK == TUK_Friend || TUK == TUK_Reference) { 4649 DC = computeDeclContext(SS, false); 4650 if (!DC) { 4651 IsDependent = true; 4652 return DeclPtrTy(); 4653 } 4654 } 4655 4656 if (RequireCompleteDeclContext(SS)) 4657 return DeclPtrTy::make((Decl *)0); 4658 4659 DC = computeDeclContext(SS, true); 4660 SearchDC = DC; 4661 // Look-up name inside 'foo::'. 4662 LookupQualifiedName(Previous, DC); 4663 4664 if (Previous.isAmbiguous()) 4665 return DeclPtrTy(); 4666 4667 if (Previous.empty()) { 4668 // Name lookup did not find anything. However, if the 4669 // nested-name-specifier refers to the current instantiation, 4670 // and that current instantiation has any dependent base 4671 // classes, we might find something at instantiation time: treat 4672 // this as a dependent elaborated-type-specifier. 4673 if (Previous.wasNotFoundInCurrentInstantiation()) { 4674 IsDependent = true; 4675 return DeclPtrTy(); 4676 } 4677 4678 // A tag 'foo::bar' must already exist. 4679 Diag(NameLoc, diag::err_not_tag_in_scope) << Name << SS.getRange(); 4680 Name = 0; 4681 Invalid = true; 4682 goto CreateNewDecl; 4683 } 4684 } else if (Name) { 4685 // If this is a named struct, check to see if there was a previous forward 4686 // declaration or definition. 4687 // FIXME: We're looking into outer scopes here, even when we 4688 // shouldn't be. Doing so can result in ambiguities that we 4689 // shouldn't be diagnosing. 4690 LookupName(Previous, S); 4691 4692 // Note: there used to be some attempt at recovery here. 4693 if (Previous.isAmbiguous()) 4694 return DeclPtrTy(); 4695 4696 if (!getLangOptions().CPlusPlus && TUK != TUK_Reference) { 4697 // FIXME: This makes sure that we ignore the contexts associated 4698 // with C structs, unions, and enums when looking for a matching 4699 // tag declaration or definition. See the similar lookup tweak 4700 // in Sema::LookupName; is there a better way to deal with this? 4701 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 4702 SearchDC = SearchDC->getParent(); 4703 } 4704 } 4705 4706 if (Previous.isSingleResult() && 4707 Previous.getFoundDecl()->isTemplateParameter()) { 4708 // Maybe we will complain about the shadowed template parameter. 4709 DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl()); 4710 // Just pretend that we didn't see the previous declaration. 4711 Previous.clear(); 4712 } 4713 4714 if (getLangOptions().CPlusPlus && Name && DC && StdNamespace && 4715 DC->Equals(StdNamespace) && Name->isStr("bad_alloc")) { 4716 // This is a declaration of or a reference to "std::bad_alloc". 4717 isStdBadAlloc = true; 4718 4719 if (Previous.empty() && StdBadAlloc) { 4720 // std::bad_alloc has been implicitly declared (but made invisible to 4721 // name lookup). Fill in this implicit declaration as the previous 4722 // declaration, so that the declarations get chained appropriately. 4723 Previous.addDecl(StdBadAlloc); 4724 } 4725 } 4726 4727 if (!Previous.empty()) { 4728 assert(Previous.isSingleResult()); 4729 NamedDecl *PrevDecl = Previous.getFoundDecl(); 4730 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 4731 // If this is a use of a previous tag, or if the tag is already declared 4732 // in the same scope (so that the definition/declaration completes or 4733 // rementions the tag), reuse the decl. 4734 if (TUK == TUK_Reference || TUK == TUK_Friend || 4735 isDeclInScope(PrevDecl, SearchDC, S)) { 4736 // Make sure that this wasn't declared as an enum and now used as a 4737 // struct or something similar. 4738 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, KWLoc, *Name)) { 4739 bool SafeToContinue 4740 = (PrevTagDecl->getTagKind() != TagDecl::TK_enum && 4741 Kind != TagDecl::TK_enum); 4742 if (SafeToContinue) 4743 Diag(KWLoc, diag::err_use_with_wrong_tag) 4744 << Name 4745 << CodeModificationHint::CreateReplacement(SourceRange(KWLoc), 4746 PrevTagDecl->getKindName()); 4747 else 4748 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 4749 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 4750 4751 if (SafeToContinue) 4752 Kind = PrevTagDecl->getTagKind(); 4753 else { 4754 // Recover by making this an anonymous redefinition. 4755 Name = 0; 4756 Previous.clear(); 4757 Invalid = true; 4758 } 4759 } 4760 4761 if (!Invalid) { 4762 // If this is a use, just return the declaration we found. 4763 4764 // FIXME: In the future, return a variant or some other clue 4765 // for the consumer of this Decl to know it doesn't own it. 4766 // For our current ASTs this shouldn't be a problem, but will 4767 // need to be changed with DeclGroups. 4768 if (TUK == TUK_Reference || TUK == TUK_Friend) 4769 return DeclPtrTy::make(PrevTagDecl); 4770 4771 // Diagnose attempts to redefine a tag. 4772 if (TUK == TUK_Definition) { 4773 if (TagDecl *Def = PrevTagDecl->getDefinition()) { 4774 // If we're defining a specialization and the previous definition 4775 // is from an implicit instantiation, don't emit an error 4776 // here; we'll catch this in the general case below. 4777 if (!isExplicitSpecialization || 4778 !isa<CXXRecordDecl>(Def) || 4779 cast<CXXRecordDecl>(Def)->getTemplateSpecializationKind() 4780 == TSK_ExplicitSpecialization) { 4781 Diag(NameLoc, diag::err_redefinition) << Name; 4782 Diag(Def->getLocation(), diag::note_previous_definition); 4783 // If this is a redefinition, recover by making this 4784 // struct be anonymous, which will make any later 4785 // references get the previous definition. 4786 Name = 0; 4787 Previous.clear(); 4788 Invalid = true; 4789 } 4790 } else { 4791 // If the type is currently being defined, complain 4792 // about a nested redefinition. 4793 TagType *Tag = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 4794 if (Tag->isBeingDefined()) { 4795 Diag(NameLoc, diag::err_nested_redefinition) << Name; 4796 Diag(PrevTagDecl->getLocation(), 4797 diag::note_previous_definition); 4798 Name = 0; 4799 Previous.clear(); 4800 Invalid = true; 4801 } 4802 } 4803 4804 // Okay, this is definition of a previously declared or referenced 4805 // tag PrevDecl. We're going to create a new Decl for it. 4806 } 4807 } 4808 // If we get here we have (another) forward declaration or we 4809 // have a definition. Just create a new decl. 4810 4811 } else { 4812 // If we get here, this is a definition of a new tag type in a nested 4813 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 4814 // new decl/type. We set PrevDecl to NULL so that the entities 4815 // have distinct types. 4816 Previous.clear(); 4817 } 4818 // If we get here, we're going to create a new Decl. If PrevDecl 4819 // is non-NULL, it's a definition of the tag declared by 4820 // PrevDecl. If it's NULL, we have a new definition. 4821 } else { 4822 // PrevDecl is a namespace, template, or anything else 4823 // that lives in the IDNS_Tag identifier namespace. 4824 if (isDeclInScope(PrevDecl, SearchDC, S)) { 4825 // The tag name clashes with a namespace name, issue an error and 4826 // recover by making this tag be anonymous. 4827 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 4828 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 4829 Name = 0; 4830 Previous.clear(); 4831 Invalid = true; 4832 } else { 4833 // The existing declaration isn't relevant to us; we're in a 4834 // new scope, so clear out the previous declaration. 4835 Previous.clear(); 4836 } 4837 } 4838 } else if (TUK == TUK_Reference && SS.isEmpty() && Name) { 4839 // C++ [basic.scope.pdecl]p5: 4840 // -- for an elaborated-type-specifier of the form 4841 // 4842 // class-key identifier 4843 // 4844 // if the elaborated-type-specifier is used in the 4845 // decl-specifier-seq or parameter-declaration-clause of a 4846 // function defined in namespace scope, the identifier is 4847 // declared as a class-name in the namespace that contains 4848 // the declaration; otherwise, except as a friend 4849 // declaration, the identifier is declared in the smallest 4850 // non-class, non-function-prototype scope that contains the 4851 // declaration. 4852 // 4853 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 4854 // C structs and unions. 4855 // 4856 // It is an error in C++ to declare (rather than define) an enum 4857 // type, including via an elaborated type specifier. We'll 4858 // diagnose that later; for now, declare the enum in the same 4859 // scope as we would have picked for any other tag type. 4860 // 4861 // GNU C also supports this behavior as part of its incomplete 4862 // enum types extension, while GNU C++ does not. 4863 // 4864 // Find the context where we'll be declaring the tag. 4865 // FIXME: We would like to maintain the current DeclContext as the 4866 // lexical context, 4867 while (SearchDC->isRecord()) 4868 SearchDC = SearchDC->getParent(); 4869 4870 // Find the scope where we'll be declaring the tag. 4871 while (S->isClassScope() || 4872 (getLangOptions().CPlusPlus && S->isFunctionPrototypeScope()) || 4873 ((S->getFlags() & Scope::DeclScope) == 0) || 4874 (S->getEntity() && 4875 ((DeclContext *)S->getEntity())->isTransparentContext())) 4876 S = S->getParent(); 4877 4878 } else if (TUK == TUK_Friend && SS.isEmpty() && Name) { 4879 // C++ [namespace.memdef]p3: 4880 // If a friend declaration in a non-local class first declares a 4881 // class or function, the friend class or function is a member of 4882 // the innermost enclosing namespace. 4883 SearchDC = SearchDC->getEnclosingNamespaceContext(); 4884 4885 // Look up through our scopes until we find one with an entity which 4886 // matches our declaration context. 4887 while (S->getEntity() && 4888 ((DeclContext *)S->getEntity())->getPrimaryContext() != SearchDC) { 4889 S = S->getParent(); 4890 assert(S && "No enclosing scope matching the enclosing namespace."); 4891 } 4892 } 4893 4894CreateNewDecl: 4895 4896 TagDecl *PrevDecl = 0; 4897 if (Previous.isSingleResult()) 4898 PrevDecl = cast<TagDecl>(Previous.getFoundDecl()); 4899 4900 // If there is an identifier, use the location of the identifier as the 4901 // location of the decl, otherwise use the location of the struct/union 4902 // keyword. 4903 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 4904 4905 // Otherwise, create a new declaration. If there is a previous 4906 // declaration of the same entity, the two will be linked via 4907 // PrevDecl. 4908 TagDecl *New; 4909 4910 if (Kind == TagDecl::TK_enum) { 4911 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 4912 // enum X { A, B, C } D; D should chain to X. 4913 New = EnumDecl::Create(Context, SearchDC, Loc, Name, KWLoc, 4914 cast_or_null<EnumDecl>(PrevDecl)); 4915 // If this is an undefined enum, warn. 4916 if (TUK != TUK_Definition && !Invalid) { 4917 unsigned DK = getLangOptions().CPlusPlus? diag::err_forward_ref_enum 4918 : diag::ext_forward_ref_enum; 4919 Diag(Loc, DK); 4920 } 4921 } else { 4922 // struct/union/class 4923 4924 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 4925 // struct X { int A; } D; D should chain to X. 4926 if (getLangOptions().CPlusPlus) { 4927 // FIXME: Look for a way to use RecordDecl for simple structs. 4928 New = CXXRecordDecl::Create(Context, Kind, SearchDC, Loc, Name, KWLoc, 4929 cast_or_null<CXXRecordDecl>(PrevDecl)); 4930 4931 if (isStdBadAlloc && (!StdBadAlloc || StdBadAlloc->isImplicit())) 4932 StdBadAlloc = cast<CXXRecordDecl>(New); 4933 } else 4934 New = RecordDecl::Create(Context, Kind, SearchDC, Loc, Name, KWLoc, 4935 cast_or_null<RecordDecl>(PrevDecl)); 4936 } 4937 4938 // Maybe add qualifier info. 4939 if (SS.isNotEmpty()) { 4940 NestedNameSpecifier *NNS 4941 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 4942 New->setQualifierInfo(NNS, SS.getRange()); 4943 } 4944 4945 if (Kind != TagDecl::TK_enum) { 4946 // Handle #pragma pack: if the #pragma pack stack has non-default 4947 // alignment, make up a packed attribute for this decl. These 4948 // attributes are checked when the ASTContext lays out the 4949 // structure. 4950 // 4951 // It is important for implementing the correct semantics that this 4952 // happen here (in act on tag decl). The #pragma pack stack is 4953 // maintained as a result of parser callbacks which can occur at 4954 // many points during the parsing of a struct declaration (because 4955 // the #pragma tokens are effectively skipped over during the 4956 // parsing of the struct). 4957 if (unsigned Alignment = getPragmaPackAlignment()) 4958 New->addAttr(::new (Context) PragmaPackAttr(Alignment * 8)); 4959 } 4960 4961 if (getLangOptions().CPlusPlus && SS.isEmpty() && Name && !Invalid) { 4962 // C++ [dcl.typedef]p3: 4963 // [...] Similarly, in a given scope, a class or enumeration 4964 // shall not be declared with the same name as a typedef-name 4965 // that is declared in that scope and refers to a type other 4966 // than the class or enumeration itself. 4967 LookupResult Lookup(*this, Name, NameLoc, LookupOrdinaryName, 4968 ForRedeclaration); 4969 LookupName(Lookup, S); 4970 TypedefDecl *PrevTypedef = Lookup.getAsSingle<TypedefDecl>(); 4971 NamedDecl *PrevTypedefNamed = PrevTypedef; 4972 if (PrevTypedef && isDeclInScope(PrevTypedefNamed, SearchDC, S) && 4973 Context.getCanonicalType(Context.getTypeDeclType(PrevTypedef)) != 4974 Context.getCanonicalType(Context.getTypeDeclType(New))) { 4975 Diag(Loc, diag::err_tag_definition_of_typedef) 4976 << Context.getTypeDeclType(New) 4977 << PrevTypedef->getUnderlyingType(); 4978 Diag(PrevTypedef->getLocation(), diag::note_previous_definition); 4979 Invalid = true; 4980 } 4981 } 4982 4983 // If this is a specialization of a member class (of a class template), 4984 // check the specialization. 4985 if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous)) 4986 Invalid = true; 4987 4988 if (Invalid) 4989 New->setInvalidDecl(); 4990 4991 if (Attr) 4992 ProcessDeclAttributeList(S, New, Attr); 4993 4994 // If we're declaring or defining a tag in function prototype scope 4995 // in C, note that this type can only be used within the function. 4996 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 4997 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 4998 4999 // Set the lexical context. If the tag has a C++ scope specifier, the 5000 // lexical context will be different from the semantic context. 5001 New->setLexicalDeclContext(CurContext); 5002 5003 // Mark this as a friend decl if applicable. 5004 if (TUK == TUK_Friend) 5005 New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ !Previous.empty()); 5006 5007 // Set the access specifier. 5008 if (!Invalid && TUK != TUK_Friend) 5009 SetMemberAccessSpecifier(New, PrevDecl, AS); 5010 5011 if (TUK == TUK_Definition) 5012 New->startDefinition(); 5013 5014 // If this has an identifier, add it to the scope stack. 5015 if (TUK == TUK_Friend) { 5016 // We might be replacing an existing declaration in the lookup tables; 5017 // if so, borrow its access specifier. 5018 if (PrevDecl) 5019 New->setAccess(PrevDecl->getAccess()); 5020 5021 // Friend tag decls are visible in fairly strange ways. 5022 if (!CurContext->isDependentContext()) { 5023 DeclContext *DC = New->getDeclContext()->getLookupContext(); 5024 DC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 5025 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 5026 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false); 5027 } 5028 } else if (Name) { 5029 S = getNonFieldDeclScope(S); 5030 PushOnScopeChains(New, S); 5031 } else { 5032 CurContext->addDecl(New); 5033 } 5034 5035 // If this is the C FILE type, notify the AST context. 5036 if (IdentifierInfo *II = New->getIdentifier()) 5037 if (!New->isInvalidDecl() && 5038 New->getDeclContext()->getLookupContext()->isTranslationUnit() && 5039 II->isStr("FILE")) 5040 Context.setFILEDecl(New); 5041 5042 OwnedDecl = true; 5043 return DeclPtrTy::make(New); 5044} 5045 5046void Sema::ActOnTagStartDefinition(Scope *S, DeclPtrTy TagD) { 5047 AdjustDeclIfTemplate(TagD); 5048 TagDecl *Tag = cast<TagDecl>(TagD.getAs<Decl>()); 5049 5050 // Enter the tag context. 5051 PushDeclContext(S, Tag); 5052} 5053 5054void Sema::ActOnStartCXXMemberDeclarations(Scope *S, DeclPtrTy TagD, 5055 SourceLocation LBraceLoc) { 5056 AdjustDeclIfTemplate(TagD); 5057 CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD.getAs<Decl>()); 5058 5059 FieldCollector->StartClass(); 5060 5061 if (!Record->getIdentifier()) 5062 return; 5063 5064 // C++ [class]p2: 5065 // [...] The class-name is also inserted into the scope of the 5066 // class itself; this is known as the injected-class-name. For 5067 // purposes of access checking, the injected-class-name is treated 5068 // as if it were a public member name. 5069 CXXRecordDecl *InjectedClassName 5070 = CXXRecordDecl::Create(Context, Record->getTagKind(), 5071 CurContext, Record->getLocation(), 5072 Record->getIdentifier(), 5073 Record->getTagKeywordLoc(), 5074 Record); 5075 InjectedClassName->setImplicit(); 5076 InjectedClassName->setAccess(AS_public); 5077 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 5078 InjectedClassName->setDescribedClassTemplate(Template); 5079 PushOnScopeChains(InjectedClassName, S); 5080 assert(InjectedClassName->isInjectedClassName() && 5081 "Broken injected-class-name"); 5082} 5083 5084// Traverses the class and any nested classes, making a note of any 5085// dynamic classes that have no key function so that we can mark all of 5086// their virtual member functions as "used" at the end of the translation 5087// unit. This ensures that all functions needed by the vtable will get 5088// instantiated/synthesized. 5089static void 5090RecordDynamicClassesWithNoKeyFunction(Sema &S, CXXRecordDecl *Record, 5091 SourceLocation Loc) { 5092 // We don't look at dependent or undefined classes. 5093 if (Record->isDependentContext() || !Record->isDefinition()) 5094 return; 5095 5096 if (Record->isDynamicClass()) { 5097 const CXXMethodDecl *KeyFunction = S.Context.getKeyFunction(Record); 5098 5099 if (!KeyFunction) 5100 S.ClassesWithUnmarkedVirtualMembers.push_back(std::make_pair(Record, 5101 Loc)); 5102 5103 if ((!KeyFunction || (KeyFunction->getBody() && KeyFunction->isInlined())) 5104 && Record->getLinkage() == ExternalLinkage) 5105 S.Diag(Record->getLocation(), diag::warn_weak_vtable) << Record; 5106 } 5107 for (DeclContext::decl_iterator D = Record->decls_begin(), 5108 DEnd = Record->decls_end(); 5109 D != DEnd; ++D) { 5110 if (CXXRecordDecl *Nested = dyn_cast<CXXRecordDecl>(*D)) 5111 RecordDynamicClassesWithNoKeyFunction(S, Nested, Loc); 5112 } 5113} 5114 5115void Sema::ActOnTagFinishDefinition(Scope *S, DeclPtrTy TagD, 5116 SourceLocation RBraceLoc) { 5117 AdjustDeclIfTemplate(TagD); 5118 TagDecl *Tag = cast<TagDecl>(TagD.getAs<Decl>()); 5119 Tag->setRBraceLoc(RBraceLoc); 5120 5121 if (isa<CXXRecordDecl>(Tag)) 5122 FieldCollector->FinishClass(); 5123 5124 // Exit this scope of this tag's definition. 5125 PopDeclContext(); 5126 5127 if (isa<CXXRecordDecl>(Tag) && !Tag->getLexicalDeclContext()->isRecord()) 5128 RecordDynamicClassesWithNoKeyFunction(*this, cast<CXXRecordDecl>(Tag), 5129 RBraceLoc); 5130 5131 // Notify the consumer that we've defined a tag. 5132 Consumer.HandleTagDeclDefinition(Tag); 5133} 5134 5135void Sema::ActOnTagDefinitionError(Scope *S, DeclPtrTy TagD) { 5136 AdjustDeclIfTemplate(TagD); 5137 TagDecl *Tag = cast<TagDecl>(TagD.getAs<Decl>()); 5138 Tag->setInvalidDecl(); 5139 5140 // We're undoing ActOnTagStartDefinition here, not 5141 // ActOnStartCXXMemberDeclarations, so we don't have to mess with 5142 // the FieldCollector. 5143 5144 PopDeclContext(); 5145} 5146 5147// Note that FieldName may be null for anonymous bitfields. 5148bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName, 5149 QualType FieldTy, const Expr *BitWidth, 5150 bool *ZeroWidth) { 5151 // Default to true; that shouldn't confuse checks for emptiness 5152 if (ZeroWidth) 5153 *ZeroWidth = true; 5154 5155 // C99 6.7.2.1p4 - verify the field type. 5156 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 5157 if (!FieldTy->isDependentType() && !FieldTy->isIntegralType()) { 5158 // Handle incomplete types with specific error. 5159 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 5160 return true; 5161 if (FieldName) 5162 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 5163 << FieldName << FieldTy << BitWidth->getSourceRange(); 5164 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) 5165 << FieldTy << BitWidth->getSourceRange(); 5166 } 5167 5168 // If the bit-width is type- or value-dependent, don't try to check 5169 // it now. 5170 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 5171 return false; 5172 5173 llvm::APSInt Value; 5174 if (VerifyIntegerConstantExpression(BitWidth, &Value)) 5175 return true; 5176 5177 if (Value != 0 && ZeroWidth) 5178 *ZeroWidth = false; 5179 5180 // Zero-width bitfield is ok for anonymous field. 5181 if (Value == 0 && FieldName) 5182 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 5183 5184 if (Value.isSigned() && Value.isNegative()) { 5185 if (FieldName) 5186 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 5187 << FieldName << Value.toString(10); 5188 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) 5189 << Value.toString(10); 5190 } 5191 5192 if (!FieldTy->isDependentType()) { 5193 uint64_t TypeSize = Context.getTypeSize(FieldTy); 5194 if (Value.getZExtValue() > TypeSize) { 5195 if (FieldName) 5196 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 5197 << FieldName << (unsigned)TypeSize; 5198 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) 5199 << (unsigned)TypeSize; 5200 } 5201 } 5202 5203 return false; 5204} 5205 5206/// ActOnField - Each field of a struct/union/class is passed into this in order 5207/// to create a FieldDecl object for it. 5208Sema::DeclPtrTy Sema::ActOnField(Scope *S, DeclPtrTy TagD, 5209 SourceLocation DeclStart, 5210 Declarator &D, ExprTy *BitfieldWidth) { 5211 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD.getAs<Decl>()), 5212 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 5213 AS_public); 5214 return DeclPtrTy::make(Res); 5215} 5216 5217/// HandleField - Analyze a field of a C struct or a C++ data member. 5218/// 5219FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 5220 SourceLocation DeclStart, 5221 Declarator &D, Expr *BitWidth, 5222 AccessSpecifier AS) { 5223 IdentifierInfo *II = D.getIdentifier(); 5224 SourceLocation Loc = DeclStart; 5225 if (II) Loc = D.getIdentifierLoc(); 5226 5227 TypeSourceInfo *TInfo = 0; 5228 QualType T = GetTypeForDeclarator(D, S, &TInfo); 5229 if (getLangOptions().CPlusPlus) 5230 CheckExtraCXXDefaultArguments(D); 5231 5232 DiagnoseFunctionSpecifiers(D); 5233 5234 if (D.getDeclSpec().isThreadSpecified()) 5235 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 5236 5237 NamedDecl *PrevDecl = LookupSingleName(S, II, LookupMemberName, 5238 ForRedeclaration); 5239 5240 if (PrevDecl && PrevDecl->isTemplateParameter()) { 5241 // Maybe we will complain about the shadowed template parameter. 5242 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 5243 // Just pretend that we didn't see the previous declaration. 5244 PrevDecl = 0; 5245 } 5246 5247 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 5248 PrevDecl = 0; 5249 5250 bool Mutable 5251 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable); 5252 SourceLocation TSSL = D.getSourceRange().getBegin(); 5253 FieldDecl *NewFD 5254 = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, TSSL, 5255 AS, PrevDecl, &D); 5256 if (NewFD->isInvalidDecl() && PrevDecl) { 5257 // Don't introduce NewFD into scope; there's already something 5258 // with the same name in the same scope. 5259 } else if (II) { 5260 PushOnScopeChains(NewFD, S); 5261 } else 5262 Record->addDecl(NewFD); 5263 5264 return NewFD; 5265} 5266 5267/// \brief Build a new FieldDecl and check its well-formedness. 5268/// 5269/// This routine builds a new FieldDecl given the fields name, type, 5270/// record, etc. \p PrevDecl should refer to any previous declaration 5271/// with the same name and in the same scope as the field to be 5272/// created. 5273/// 5274/// \returns a new FieldDecl. 5275/// 5276/// \todo The Declarator argument is a hack. It will be removed once 5277FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 5278 TypeSourceInfo *TInfo, 5279 RecordDecl *Record, SourceLocation Loc, 5280 bool Mutable, Expr *BitWidth, 5281 SourceLocation TSSL, 5282 AccessSpecifier AS, NamedDecl *PrevDecl, 5283 Declarator *D) { 5284 IdentifierInfo *II = Name.getAsIdentifierInfo(); 5285 bool InvalidDecl = false; 5286 if (D) InvalidDecl = D->isInvalidType(); 5287 5288 // If we receive a broken type, recover by assuming 'int' and 5289 // marking this declaration as invalid. 5290 if (T.isNull()) { 5291 InvalidDecl = true; 5292 T = Context.IntTy; 5293 } 5294 5295 QualType EltTy = Context.getBaseElementType(T); 5296 if (!EltTy->isDependentType() && 5297 RequireCompleteType(Loc, EltTy, diag::err_field_incomplete)) 5298 InvalidDecl = true; 5299 5300 // C99 6.7.2.1p8: A member of a structure or union may have any type other 5301 // than a variably modified type. 5302 if (!InvalidDecl && T->isVariablyModifiedType()) { 5303 bool SizeIsNegative; 5304 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 5305 SizeIsNegative); 5306 if (!FixedTy.isNull()) { 5307 Diag(Loc, diag::warn_illegal_constant_array_size); 5308 T = FixedTy; 5309 } else { 5310 if (SizeIsNegative) 5311 Diag(Loc, diag::err_typecheck_negative_array_size); 5312 else 5313 Diag(Loc, diag::err_typecheck_field_variable_size); 5314 InvalidDecl = true; 5315 } 5316 } 5317 5318 // Fields can not have abstract class types 5319 if (!InvalidDecl && RequireNonAbstractType(Loc, T, 5320 diag::err_abstract_type_in_decl, 5321 AbstractFieldType)) 5322 InvalidDecl = true; 5323 5324 bool ZeroWidth = false; 5325 // If this is declared as a bit-field, check the bit-field. 5326 if (!InvalidDecl && BitWidth && 5327 VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth)) { 5328 InvalidDecl = true; 5329 DeleteExpr(BitWidth); 5330 BitWidth = 0; 5331 ZeroWidth = false; 5332 } 5333 5334 FieldDecl *NewFD = FieldDecl::Create(Context, Record, Loc, II, T, TInfo, 5335 BitWidth, Mutable); 5336 if (InvalidDecl) 5337 NewFD->setInvalidDecl(); 5338 5339 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 5340 Diag(Loc, diag::err_duplicate_member) << II; 5341 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 5342 NewFD->setInvalidDecl(); 5343 } 5344 5345 if (!InvalidDecl && getLangOptions().CPlusPlus) { 5346 CXXRecordDecl* CXXRecord = cast<CXXRecordDecl>(Record); 5347 5348 if (!T->isPODType()) 5349 CXXRecord->setPOD(false); 5350 if (!ZeroWidth) 5351 CXXRecord->setEmpty(false); 5352 5353 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 5354 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 5355 5356 if (!RDecl->hasTrivialConstructor()) 5357 CXXRecord->setHasTrivialConstructor(false); 5358 if (!RDecl->hasTrivialCopyConstructor()) 5359 CXXRecord->setHasTrivialCopyConstructor(false); 5360 if (!RDecl->hasTrivialCopyAssignment()) 5361 CXXRecord->setHasTrivialCopyAssignment(false); 5362 if (!RDecl->hasTrivialDestructor()) 5363 CXXRecord->setHasTrivialDestructor(false); 5364 5365 // C++ 9.5p1: An object of a class with a non-trivial 5366 // constructor, a non-trivial copy constructor, a non-trivial 5367 // destructor, or a non-trivial copy assignment operator 5368 // cannot be a member of a union, nor can an array of such 5369 // objects. 5370 // TODO: C++0x alters this restriction significantly. 5371 if (Record->isUnion()) { 5372 // We check for copy constructors before constructors 5373 // because otherwise we'll never get complaints about 5374 // copy constructors. 5375 5376 const CXXSpecialMember invalid = (CXXSpecialMember) -1; 5377 5378 CXXSpecialMember member; 5379 if (!RDecl->hasTrivialCopyConstructor()) 5380 member = CXXCopyConstructor; 5381 else if (!RDecl->hasTrivialConstructor()) 5382 member = CXXDefaultConstructor; 5383 else if (!RDecl->hasTrivialCopyAssignment()) 5384 member = CXXCopyAssignment; 5385 else if (!RDecl->hasTrivialDestructor()) 5386 member = CXXDestructor; 5387 else 5388 member = invalid; 5389 5390 if (member != invalid) { 5391 Diag(Loc, diag::err_illegal_union_member) << Name << member; 5392 DiagnoseNontrivial(RT, member); 5393 NewFD->setInvalidDecl(); 5394 } 5395 } 5396 } 5397 } 5398 5399 // FIXME: We need to pass in the attributes given an AST 5400 // representation, not a parser representation. 5401 if (D) 5402 // FIXME: What to pass instead of TUScope? 5403 ProcessDeclAttributes(TUScope, NewFD, *D); 5404 5405 if (T.isObjCGCWeak()) 5406 Diag(Loc, diag::warn_attribute_weak_on_field); 5407 5408 NewFD->setAccess(AS); 5409 5410 // C++ [dcl.init.aggr]p1: 5411 // An aggregate is an array or a class (clause 9) with [...] no 5412 // private or protected non-static data members (clause 11). 5413 // A POD must be an aggregate. 5414 if (getLangOptions().CPlusPlus && 5415 (AS == AS_private || AS == AS_protected)) { 5416 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record); 5417 CXXRecord->setAggregate(false); 5418 CXXRecord->setPOD(false); 5419 } 5420 5421 return NewFD; 5422} 5423 5424/// DiagnoseNontrivial - Given that a class has a non-trivial 5425/// special member, figure out why. 5426void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) { 5427 QualType QT(T, 0U); 5428 CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl()); 5429 5430 // Check whether the member was user-declared. 5431 switch (member) { 5432 case CXXDefaultConstructor: 5433 if (RD->hasUserDeclaredConstructor()) { 5434 typedef CXXRecordDecl::ctor_iterator ctor_iter; 5435 for (ctor_iter ci = RD->ctor_begin(), ce = RD->ctor_end(); ci != ce;++ci){ 5436 const FunctionDecl *body = 0; 5437 ci->getBody(body); 5438 if (!body || 5439 !cast<CXXConstructorDecl>(body)->isImplicitlyDefined(Context)) { 5440 SourceLocation CtorLoc = ci->getLocation(); 5441 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 5442 return; 5443 } 5444 } 5445 5446 assert(0 && "found no user-declared constructors"); 5447 return; 5448 } 5449 break; 5450 5451 case CXXCopyConstructor: 5452 if (RD->hasUserDeclaredCopyConstructor()) { 5453 SourceLocation CtorLoc = 5454 RD->getCopyConstructor(Context, 0)->getLocation(); 5455 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 5456 return; 5457 } 5458 break; 5459 5460 case CXXCopyAssignment: 5461 if (RD->hasUserDeclaredCopyAssignment()) { 5462 // FIXME: this should use the location of the copy 5463 // assignment, not the type. 5464 SourceLocation TyLoc = RD->getSourceRange().getBegin(); 5465 Diag(TyLoc, diag::note_nontrivial_user_defined) << QT << member; 5466 return; 5467 } 5468 break; 5469 5470 case CXXDestructor: 5471 if (RD->hasUserDeclaredDestructor()) { 5472 SourceLocation DtorLoc = RD->getDestructor(Context)->getLocation(); 5473 Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member; 5474 return; 5475 } 5476 break; 5477 } 5478 5479 typedef CXXRecordDecl::base_class_iterator base_iter; 5480 5481 // Virtual bases and members inhibit trivial copying/construction, 5482 // but not trivial destruction. 5483 if (member != CXXDestructor) { 5484 // Check for virtual bases. vbases includes indirect virtual bases, 5485 // so we just iterate through the direct bases. 5486 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) 5487 if (bi->isVirtual()) { 5488 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 5489 Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1; 5490 return; 5491 } 5492 5493 // Check for virtual methods. 5494 typedef CXXRecordDecl::method_iterator meth_iter; 5495 for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me; 5496 ++mi) { 5497 if (mi->isVirtual()) { 5498 SourceLocation MLoc = mi->getSourceRange().getBegin(); 5499 Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0; 5500 return; 5501 } 5502 } 5503 } 5504 5505 bool (CXXRecordDecl::*hasTrivial)() const; 5506 switch (member) { 5507 case CXXDefaultConstructor: 5508 hasTrivial = &CXXRecordDecl::hasTrivialConstructor; break; 5509 case CXXCopyConstructor: 5510 hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break; 5511 case CXXCopyAssignment: 5512 hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break; 5513 case CXXDestructor: 5514 hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break; 5515 default: 5516 assert(0 && "unexpected special member"); return; 5517 } 5518 5519 // Check for nontrivial bases (and recurse). 5520 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) { 5521 const RecordType *BaseRT = bi->getType()->getAs<RecordType>(); 5522 assert(BaseRT && "Don't know how to handle dependent bases"); 5523 CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl()); 5524 if (!(BaseRecTy->*hasTrivial)()) { 5525 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 5526 Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member; 5527 DiagnoseNontrivial(BaseRT, member); 5528 return; 5529 } 5530 } 5531 5532 // Check for nontrivial members (and recurse). 5533 typedef RecordDecl::field_iterator field_iter; 5534 for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe; 5535 ++fi) { 5536 QualType EltTy = Context.getBaseElementType((*fi)->getType()); 5537 if (const RecordType *EltRT = EltTy->getAs<RecordType>()) { 5538 CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl()); 5539 5540 if (!(EltRD->*hasTrivial)()) { 5541 SourceLocation FLoc = (*fi)->getLocation(); 5542 Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member; 5543 DiagnoseNontrivial(EltRT, member); 5544 return; 5545 } 5546 } 5547 } 5548 5549 assert(0 && "found no explanation for non-trivial member"); 5550} 5551 5552/// TranslateIvarVisibility - Translate visibility from a token ID to an 5553/// AST enum value. 5554static ObjCIvarDecl::AccessControl 5555TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 5556 switch (ivarVisibility) { 5557 default: assert(0 && "Unknown visitibility kind"); 5558 case tok::objc_private: return ObjCIvarDecl::Private; 5559 case tok::objc_public: return ObjCIvarDecl::Public; 5560 case tok::objc_protected: return ObjCIvarDecl::Protected; 5561 case tok::objc_package: return ObjCIvarDecl::Package; 5562 } 5563} 5564 5565/// ActOnIvar - Each ivar field of an objective-c class is passed into this 5566/// in order to create an IvarDecl object for it. 5567Sema::DeclPtrTy Sema::ActOnIvar(Scope *S, 5568 SourceLocation DeclStart, 5569 DeclPtrTy IntfDecl, 5570 Declarator &D, ExprTy *BitfieldWidth, 5571 tok::ObjCKeywordKind Visibility) { 5572 5573 IdentifierInfo *II = D.getIdentifier(); 5574 Expr *BitWidth = (Expr*)BitfieldWidth; 5575 SourceLocation Loc = DeclStart; 5576 if (II) Loc = D.getIdentifierLoc(); 5577 5578 // FIXME: Unnamed fields can be handled in various different ways, for 5579 // example, unnamed unions inject all members into the struct namespace! 5580 5581 TypeSourceInfo *TInfo = 0; 5582 QualType T = GetTypeForDeclarator(D, S, &TInfo); 5583 5584 if (BitWidth) { 5585 // 6.7.2.1p3, 6.7.2.1p4 5586 if (VerifyBitField(Loc, II, T, BitWidth)) { 5587 D.setInvalidType(); 5588 DeleteExpr(BitWidth); 5589 BitWidth = 0; 5590 } 5591 } else { 5592 // Not a bitfield. 5593 5594 // validate II. 5595 5596 } 5597 5598 // C99 6.7.2.1p8: A member of a structure or union may have any type other 5599 // than a variably modified type. 5600 if (T->isVariablyModifiedType()) { 5601 Diag(Loc, diag::err_typecheck_ivar_variable_size); 5602 D.setInvalidType(); 5603 } 5604 5605 // Get the visibility (access control) for this ivar. 5606 ObjCIvarDecl::AccessControl ac = 5607 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 5608 : ObjCIvarDecl::None; 5609 // Must set ivar's DeclContext to its enclosing interface. 5610 Decl *EnclosingDecl = IntfDecl.getAs<Decl>(); 5611 DeclContext *EnclosingContext; 5612 if (ObjCImplementationDecl *IMPDecl = 5613 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 5614 // Case of ivar declared in an implementation. Context is that of its class. 5615 ObjCInterfaceDecl* IDecl = IMPDecl->getClassInterface(); 5616 assert(IDecl && "No class- ActOnIvar"); 5617 EnclosingContext = cast_or_null<DeclContext>(IDecl); 5618 } else 5619 EnclosingContext = dyn_cast<DeclContext>(EnclosingDecl); 5620 assert(EnclosingContext && "null DeclContext for ivar - ActOnIvar"); 5621 5622 // Construct the decl. 5623 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, 5624 EnclosingContext, Loc, II, T, 5625 TInfo, ac, (Expr *)BitfieldWidth); 5626 5627 if (II) { 5628 NamedDecl *PrevDecl = LookupSingleName(S, II, LookupMemberName, 5629 ForRedeclaration); 5630 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S) 5631 && !isa<TagDecl>(PrevDecl)) { 5632 Diag(Loc, diag::err_duplicate_member) << II; 5633 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 5634 NewID->setInvalidDecl(); 5635 } 5636 } 5637 5638 // Process attributes attached to the ivar. 5639 ProcessDeclAttributes(S, NewID, D); 5640 5641 if (D.isInvalidType()) 5642 NewID->setInvalidDecl(); 5643 5644 if (II) { 5645 // FIXME: When interfaces are DeclContexts, we'll need to add 5646 // these to the interface. 5647 S->AddDecl(DeclPtrTy::make(NewID)); 5648 IdResolver.AddDecl(NewID); 5649 } 5650 5651 return DeclPtrTy::make(NewID); 5652} 5653 5654void Sema::ActOnFields(Scope* S, 5655 SourceLocation RecLoc, DeclPtrTy RecDecl, 5656 DeclPtrTy *Fields, unsigned NumFields, 5657 SourceLocation LBrac, SourceLocation RBrac, 5658 AttributeList *Attr) { 5659 Decl *EnclosingDecl = RecDecl.getAs<Decl>(); 5660 assert(EnclosingDecl && "missing record or interface decl"); 5661 5662 // If the decl this is being inserted into is invalid, then it may be a 5663 // redeclaration or some other bogus case. Don't try to add fields to it. 5664 if (EnclosingDecl->isInvalidDecl()) { 5665 // FIXME: Deallocate fields? 5666 return; 5667 } 5668 5669 5670 // Verify that all the fields are okay. 5671 unsigned NumNamedMembers = 0; 5672 llvm::SmallVector<FieldDecl*, 32> RecFields; 5673 5674 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 5675 for (unsigned i = 0; i != NumFields; ++i) { 5676 FieldDecl *FD = cast<FieldDecl>(Fields[i].getAs<Decl>()); 5677 5678 // Get the type for the field. 5679 Type *FDTy = FD->getType().getTypePtr(); 5680 5681 if (!FD->isAnonymousStructOrUnion()) { 5682 // Remember all fields written by the user. 5683 RecFields.push_back(FD); 5684 } 5685 5686 // If the field is already invalid for some reason, don't emit more 5687 // diagnostics about it. 5688 if (FD->isInvalidDecl()) { 5689 EnclosingDecl->setInvalidDecl(); 5690 continue; 5691 } 5692 5693 // C99 6.7.2.1p2: 5694 // A structure or union shall not contain a member with 5695 // incomplete or function type (hence, a structure shall not 5696 // contain an instance of itself, but may contain a pointer to 5697 // an instance of itself), except that the last member of a 5698 // structure with more than one named member may have incomplete 5699 // array type; such a structure (and any union containing, 5700 // possibly recursively, a member that is such a structure) 5701 // shall not be a member of a structure or an element of an 5702 // array. 5703 if (FDTy->isFunctionType()) { 5704 // Field declared as a function. 5705 Diag(FD->getLocation(), diag::err_field_declared_as_function) 5706 << FD->getDeclName(); 5707 FD->setInvalidDecl(); 5708 EnclosingDecl->setInvalidDecl(); 5709 continue; 5710 } else if (FDTy->isIncompleteArrayType() && i == NumFields - 1 && 5711 Record && Record->isStruct()) { 5712 // Flexible array member. 5713 if (NumNamedMembers < 1) { 5714 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 5715 << FD->getDeclName(); 5716 FD->setInvalidDecl(); 5717 EnclosingDecl->setInvalidDecl(); 5718 continue; 5719 } 5720 // Okay, we have a legal flexible array member at the end of the struct. 5721 if (Record) 5722 Record->setHasFlexibleArrayMember(true); 5723 } else if (!FDTy->isDependentType() && 5724 RequireCompleteType(FD->getLocation(), FD->getType(), 5725 diag::err_field_incomplete)) { 5726 // Incomplete type 5727 FD->setInvalidDecl(); 5728 EnclosingDecl->setInvalidDecl(); 5729 continue; 5730 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) { 5731 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 5732 // If this is a member of a union, then entire union becomes "flexible". 5733 if (Record && Record->isUnion()) { 5734 Record->setHasFlexibleArrayMember(true); 5735 } else { 5736 // If this is a struct/class and this is not the last element, reject 5737 // it. Note that GCC supports variable sized arrays in the middle of 5738 // structures. 5739 if (i != NumFields-1) 5740 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 5741 << FD->getDeclName() << FD->getType(); 5742 else { 5743 // We support flexible arrays at the end of structs in 5744 // other structs as an extension. 5745 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 5746 << FD->getDeclName(); 5747 if (Record) 5748 Record->setHasFlexibleArrayMember(true); 5749 } 5750 } 5751 } 5752 if (Record && FDTTy->getDecl()->hasObjectMember()) 5753 Record->setHasObjectMember(true); 5754 } else if (FDTy->isObjCInterfaceType()) { 5755 /// A field cannot be an Objective-c object 5756 Diag(FD->getLocation(), diag::err_statically_allocated_object); 5757 FD->setInvalidDecl(); 5758 EnclosingDecl->setInvalidDecl(); 5759 continue; 5760 } else if (getLangOptions().ObjC1 && 5761 getLangOptions().getGCMode() != LangOptions::NonGC && 5762 Record && 5763 (FD->getType()->isObjCObjectPointerType() || 5764 FD->getType().isObjCGCStrong())) 5765 Record->setHasObjectMember(true); 5766 // Keep track of the number of named members. 5767 if (FD->getIdentifier()) 5768 ++NumNamedMembers; 5769 } 5770 5771 // Okay, we successfully defined 'Record'. 5772 if (Record) { 5773 Record->completeDefinition(); 5774 } else { 5775 ObjCIvarDecl **ClsFields = 5776 reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); 5777 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 5778 ID->setLocEnd(RBrac); 5779 // Add ivar's to class's DeclContext. 5780 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 5781 ClsFields[i]->setLexicalDeclContext(ID); 5782 ID->addDecl(ClsFields[i]); 5783 } 5784 // Must enforce the rule that ivars in the base classes may not be 5785 // duplicates. 5786 if (ID->getSuperClass()) 5787 DiagnoseDuplicateIvars(ID, ID->getSuperClass()); 5788 } else if (ObjCImplementationDecl *IMPDecl = 5789 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 5790 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 5791 for (unsigned I = 0, N = RecFields.size(); I != N; ++I) 5792 // Ivar declared in @implementation never belongs to the implementation. 5793 // Only it is in implementation's lexical context. 5794 ClsFields[I]->setLexicalDeclContext(IMPDecl); 5795 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 5796 } else if (ObjCCategoryDecl *CDecl = 5797 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 5798 if (!LangOpts.ObjCNonFragileABI2 || !CDecl->IsClassExtension()) 5799 Diag(LBrac, diag::err_misplaced_ivar); 5800 else { 5801 // FIXME. Class extension does not have a LocEnd field. 5802 // CDecl->setLocEnd(RBrac); 5803 // Add ivar's to class extension's DeclContext. 5804 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 5805 ClsFields[i]->setLexicalDeclContext(CDecl); 5806 CDecl->addDecl(ClsFields[i]); 5807 } 5808 } 5809 } 5810 } 5811 5812 if (Attr) 5813 ProcessDeclAttributeList(S, Record, Attr); 5814} 5815 5816/// \brief Determine whether the given integral value is representable within 5817/// the given type T. 5818static bool isRepresentableIntegerValue(ASTContext &Context, 5819 llvm::APSInt &Value, 5820 QualType T) { 5821 assert(T->isIntegralType() && "Integral type required!"); 5822 unsigned BitWidth = Context.getTypeSize(T); 5823 5824 if (Value.isUnsigned() || Value.isNonNegative()) 5825 return Value.getActiveBits() < BitWidth; 5826 5827 return Value.getMinSignedBits() <= BitWidth; 5828} 5829 5830// \brief Given an integral type, return the next larger integral type 5831// (or a NULL type of no such type exists). 5832static QualType getNextLargerIntegralType(ASTContext &Context, QualType T) { 5833 // FIXME: Int128/UInt128 support, which also needs to be introduced into 5834 // enum checking below. 5835 assert(T->isIntegralType() && "Integral type required!"); 5836 const unsigned NumTypes = 4; 5837 QualType SignedIntegralTypes[NumTypes] = { 5838 Context.ShortTy, Context.IntTy, Context.LongTy, Context.LongLongTy 5839 }; 5840 QualType UnsignedIntegralTypes[NumTypes] = { 5841 Context.UnsignedShortTy, Context.UnsignedIntTy, Context.UnsignedLongTy, 5842 Context.UnsignedLongLongTy 5843 }; 5844 5845 unsigned BitWidth = Context.getTypeSize(T); 5846 QualType *Types = T->isSignedIntegerType()? SignedIntegralTypes 5847 : UnsignedIntegralTypes; 5848 for (unsigned I = 0; I != NumTypes; ++I) 5849 if (Context.getTypeSize(Types[I]) > BitWidth) 5850 return Types[I]; 5851 5852 return QualType(); 5853} 5854 5855EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 5856 EnumConstantDecl *LastEnumConst, 5857 SourceLocation IdLoc, 5858 IdentifierInfo *Id, 5859 ExprArg val) { 5860 Expr *Val = (Expr *)val.get(); 5861 5862 unsigned IntWidth = Context.Target.getIntWidth(); 5863 llvm::APSInt EnumVal(IntWidth); 5864 QualType EltTy; 5865 if (Val) { 5866 if (Enum->isDependentType() || Val->isTypeDependent()) 5867 EltTy = Context.DependentTy; 5868 else { 5869 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 5870 SourceLocation ExpLoc; 5871 if (!Val->isValueDependent() && 5872 VerifyIntegerConstantExpression(Val, &EnumVal)) { 5873 Val = 0; 5874 } else { 5875 if (!getLangOptions().CPlusPlus) { 5876 // C99 6.7.2.2p2: 5877 // The expression that defines the value of an enumeration constant 5878 // shall be an integer constant expression that has a value 5879 // representable as an int. 5880 5881 // Complain if the value is not representable in an int. 5882 if (!isRepresentableIntegerValue(Context, EnumVal, Context.IntTy)) 5883 Diag(IdLoc, diag::ext_enum_value_not_int) 5884 << EnumVal.toString(10) << Val->getSourceRange() 5885 << (EnumVal.isUnsigned() || EnumVal.isNonNegative()); 5886 else if (!Context.hasSameType(Val->getType(), Context.IntTy)) { 5887 // Force the type of the expression to 'int'. 5888 ImpCastExprToType(Val, Context.IntTy, CastExpr::CK_IntegralCast); 5889 5890 if (Val != val.get()) { 5891 val.release(); 5892 val = Val; 5893 } 5894 } 5895 } 5896 5897 // C++0x [dcl.enum]p5: 5898 // If the underlying type is not fixed, the type of each enumerator 5899 // is the type of its initializing value: 5900 // - If an initializer is specified for an enumerator, the 5901 // initializing value has the same type as the expression. 5902 EltTy = Val->getType(); 5903 } 5904 } 5905 } 5906 5907 if (!Val) { 5908 if (Enum->isDependentType()) 5909 EltTy = Context.DependentTy; 5910 else if (!LastEnumConst) { 5911 // C++0x [dcl.enum]p5: 5912 // If the underlying type is not fixed, the type of each enumerator 5913 // is the type of its initializing value: 5914 // - If no initializer is specified for the first enumerator, the 5915 // initializing value has an unspecified integral type. 5916 // 5917 // GCC uses 'int' for its unspecified integral type, as does 5918 // C99 6.7.2.2p3. 5919 EltTy = Context.IntTy; 5920 } else { 5921 // Assign the last value + 1. 5922 EnumVal = LastEnumConst->getInitVal(); 5923 ++EnumVal; 5924 EltTy = LastEnumConst->getType(); 5925 5926 // Check for overflow on increment. 5927 if (EnumVal < LastEnumConst->getInitVal()) { 5928 // C++0x [dcl.enum]p5: 5929 // If the underlying type is not fixed, the type of each enumerator 5930 // is the type of its initializing value: 5931 // 5932 // - Otherwise the type of the initializing value is the same as 5933 // the type of the initializing value of the preceding enumerator 5934 // unless the incremented value is not representable in that type, 5935 // in which case the type is an unspecified integral type 5936 // sufficient to contain the incremented value. If no such type 5937 // exists, the program is ill-formed. 5938 QualType T = getNextLargerIntegralType(Context, EltTy); 5939 if (T.isNull()) { 5940 // There is no integral type larger enough to represent this 5941 // value. Complain, then allow the value to wrap around. 5942 EnumVal = LastEnumConst->getInitVal(); 5943 EnumVal.zext(EnumVal.getBitWidth() * 2); 5944 Diag(IdLoc, diag::warn_enumerator_too_large) 5945 << EnumVal.toString(10); 5946 } else { 5947 EltTy = T; 5948 } 5949 5950 // Retrieve the last enumerator's value, extent that type to the 5951 // type that is supposed to be large enough to represent the incremented 5952 // value, then increment. 5953 EnumVal = LastEnumConst->getInitVal(); 5954 EnumVal.setIsSigned(EltTy->isSignedIntegerType()); 5955 EnumVal.zextOrTrunc(Context.getTypeSize(EltTy)); 5956 ++EnumVal; 5957 5958 // If we're not in C++, diagnose the overflow of enumerator values, 5959 // which in C99 means that the enumerator value is not representable in 5960 // an int (C99 6.7.2.2p2). However, we support GCC's extension that 5961 // permits enumerator values that are representable in some larger 5962 // integral type. 5963 if (!getLangOptions().CPlusPlus && !T.isNull()) 5964 Diag(IdLoc, diag::warn_enum_value_overflow); 5965 } else if (!getLangOptions().CPlusPlus && 5966 !isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 5967 // Enforce C99 6.7.2.2p2 even when we compute the next value. 5968 Diag(IdLoc, diag::ext_enum_value_not_int) 5969 << EnumVal.toString(10) << 1; 5970 } 5971 } 5972 } 5973 5974 if (!EltTy->isDependentType()) { 5975 // Make the enumerator value match the signedness and size of the 5976 // enumerator's type. 5977 EnumVal.zextOrTrunc(Context.getTypeSize(EltTy)); 5978 EnumVal.setIsSigned(EltTy->isSignedIntegerType()); 5979 } 5980 5981 val.release(); 5982 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 5983 Val, EnumVal); 5984} 5985 5986 5987Sema::DeclPtrTy Sema::ActOnEnumConstant(Scope *S, DeclPtrTy theEnumDecl, 5988 DeclPtrTy lastEnumConst, 5989 SourceLocation IdLoc, 5990 IdentifierInfo *Id, 5991 SourceLocation EqualLoc, ExprTy *val) { 5992 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl.getAs<Decl>()); 5993 EnumConstantDecl *LastEnumConst = 5994 cast_or_null<EnumConstantDecl>(lastEnumConst.getAs<Decl>()); 5995 Expr *Val = static_cast<Expr*>(val); 5996 5997 // The scope passed in may not be a decl scope. Zip up the scope tree until 5998 // we find one that is. 5999 S = getNonFieldDeclScope(S); 6000 6001 // Verify that there isn't already something declared with this name in this 6002 // scope. 6003 NamedDecl *PrevDecl = LookupSingleName(S, Id, LookupOrdinaryName, 6004 ForRedeclaration); 6005 if (PrevDecl && PrevDecl->isTemplateParameter()) { 6006 // Maybe we will complain about the shadowed template parameter. 6007 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 6008 // Just pretend that we didn't see the previous declaration. 6009 PrevDecl = 0; 6010 } 6011 6012 if (PrevDecl) { 6013 // When in C++, we may get a TagDecl with the same name; in this case the 6014 // enum constant will 'hide' the tag. 6015 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 6016 "Received TagDecl when not in C++!"); 6017 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 6018 if (isa<EnumConstantDecl>(PrevDecl)) 6019 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 6020 else 6021 Diag(IdLoc, diag::err_redefinition) << Id; 6022 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 6023 if (Val) Val->Destroy(Context); 6024 return DeclPtrTy(); 6025 } 6026 } 6027 6028 EnumConstantDecl *New = CheckEnumConstant(TheEnumDecl, LastEnumConst, 6029 IdLoc, Id, Owned(Val)); 6030 6031 // Register this decl in the current scope stack. 6032 if (New) { 6033 New->setAccess(TheEnumDecl->getAccess()); 6034 PushOnScopeChains(New, S); 6035 } 6036 6037 return DeclPtrTy::make(New); 6038} 6039 6040void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc, 6041 SourceLocation RBraceLoc, DeclPtrTy EnumDeclX, 6042 DeclPtrTy *Elements, unsigned NumElements, 6043 Scope *S, AttributeList *Attr) { 6044 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX.getAs<Decl>()); 6045 QualType EnumType = Context.getTypeDeclType(Enum); 6046 6047 if (Attr) 6048 ProcessDeclAttributeList(S, Enum, Attr); 6049 6050 if (Enum->isDependentType()) { 6051 for (unsigned i = 0; i != NumElements; ++i) { 6052 EnumConstantDecl *ECD = 6053 cast_or_null<EnumConstantDecl>(Elements[i].getAs<Decl>()); 6054 if (!ECD) continue; 6055 6056 ECD->setType(EnumType); 6057 } 6058 6059 Enum->completeDefinition(Context.DependentTy, Context.DependentTy); 6060 return; 6061 } 6062 6063 // TODO: If the result value doesn't fit in an int, it must be a long or long 6064 // long value. ISO C does not support this, but GCC does as an extension, 6065 // emit a warning. 6066 unsigned IntWidth = Context.Target.getIntWidth(); 6067 unsigned CharWidth = Context.Target.getCharWidth(); 6068 unsigned ShortWidth = Context.Target.getShortWidth(); 6069 6070 // Verify that all the values are okay, compute the size of the values, and 6071 // reverse the list. 6072 unsigned NumNegativeBits = 0; 6073 unsigned NumPositiveBits = 0; 6074 6075 // Keep track of whether all elements have type int. 6076 bool AllElementsInt = true; 6077 6078 for (unsigned i = 0; i != NumElements; ++i) { 6079 EnumConstantDecl *ECD = 6080 cast_or_null<EnumConstantDecl>(Elements[i].getAs<Decl>()); 6081 if (!ECD) continue; // Already issued a diagnostic. 6082 6083 const llvm::APSInt &InitVal = ECD->getInitVal(); 6084 6085 // Keep track of the size of positive and negative values. 6086 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 6087 NumPositiveBits = std::max(NumPositiveBits, 6088 (unsigned)InitVal.getActiveBits()); 6089 else 6090 NumNegativeBits = std::max(NumNegativeBits, 6091 (unsigned)InitVal.getMinSignedBits()); 6092 6093 // Keep track of whether every enum element has type int (very commmon). 6094 if (AllElementsInt) 6095 AllElementsInt = ECD->getType() == Context.IntTy; 6096 } 6097 6098 // Figure out the type that should be used for this enum. 6099 // FIXME: Support -fshort-enums. 6100 QualType BestType; 6101 unsigned BestWidth; 6102 6103 // C++0x N3000 [conv.prom]p3: 6104 // An rvalue of an unscoped enumeration type whose underlying 6105 // type is not fixed can be converted to an rvalue of the first 6106 // of the following types that can represent all the values of 6107 // the enumeration: int, unsigned int, long int, unsigned long 6108 // int, long long int, or unsigned long long int. 6109 // C99 6.4.4.3p2: 6110 // An identifier declared as an enumeration constant has type int. 6111 // The C99 rule is modified by a gcc extension 6112 QualType BestPromotionType; 6113 6114 bool Packed = Enum->getAttr<PackedAttr>() ? true : false; 6115 6116 if (NumNegativeBits) { 6117 // If there is a negative value, figure out the smallest integer type (of 6118 // int/long/longlong) that fits. 6119 // If it's packed, check also if it fits a char or a short. 6120 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) { 6121 BestType = Context.SignedCharTy; 6122 BestWidth = CharWidth; 6123 } else if (Packed && NumNegativeBits <= ShortWidth && 6124 NumPositiveBits < ShortWidth) { 6125 BestType = Context.ShortTy; 6126 BestWidth = ShortWidth; 6127 } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 6128 BestType = Context.IntTy; 6129 BestWidth = IntWidth; 6130 } else { 6131 BestWidth = Context.Target.getLongWidth(); 6132 6133 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) { 6134 BestType = Context.LongTy; 6135 } else { 6136 BestWidth = Context.Target.getLongLongWidth(); 6137 6138 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 6139 Diag(Enum->getLocation(), diag::warn_enum_too_large); 6140 BestType = Context.LongLongTy; 6141 } 6142 } 6143 BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType); 6144 } else { 6145 // If there is no negative value, figure out the smallest type that fits 6146 // all of the enumerator values. 6147 // If it's packed, check also if it fits a char or a short. 6148 if (Packed && NumPositiveBits <= CharWidth) { 6149 BestType = Context.UnsignedCharTy; 6150 BestPromotionType = Context.IntTy; 6151 BestWidth = CharWidth; 6152 } else if (Packed && NumPositiveBits <= ShortWidth) { 6153 BestType = Context.UnsignedShortTy; 6154 BestPromotionType = Context.IntTy; 6155 BestWidth = ShortWidth; 6156 } else if (NumPositiveBits <= IntWidth) { 6157 BestType = Context.UnsignedIntTy; 6158 BestWidth = IntWidth; 6159 BestPromotionType 6160 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 6161 ? Context.UnsignedIntTy : Context.IntTy; 6162 } else if (NumPositiveBits <= 6163 (BestWidth = Context.Target.getLongWidth())) { 6164 BestType = Context.UnsignedLongTy; 6165 BestPromotionType 6166 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 6167 ? Context.UnsignedLongTy : Context.LongTy; 6168 } else { 6169 BestWidth = Context.Target.getLongLongWidth(); 6170 assert(NumPositiveBits <= BestWidth && 6171 "How could an initializer get larger than ULL?"); 6172 BestType = Context.UnsignedLongLongTy; 6173 BestPromotionType 6174 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 6175 ? Context.UnsignedLongLongTy : Context.LongLongTy; 6176 } 6177 } 6178 6179 // Loop over all of the enumerator constants, changing their types to match 6180 // the type of the enum if needed. 6181 for (unsigned i = 0; i != NumElements; ++i) { 6182 EnumConstantDecl *ECD = 6183 cast_or_null<EnumConstantDecl>(Elements[i].getAs<Decl>()); 6184 if (!ECD) continue; // Already issued a diagnostic. 6185 6186 // Standard C says the enumerators have int type, but we allow, as an 6187 // extension, the enumerators to be larger than int size. If each 6188 // enumerator value fits in an int, type it as an int, otherwise type it the 6189 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 6190 // that X has type 'int', not 'unsigned'. 6191 6192 // Determine whether the value fits into an int. 6193 llvm::APSInt InitVal = ECD->getInitVal(); 6194 6195 // If it fits into an integer type, force it. Otherwise force it to match 6196 // the enum decl type. 6197 QualType NewTy; 6198 unsigned NewWidth; 6199 bool NewSign; 6200 if (!getLangOptions().CPlusPlus && 6201 isRepresentableIntegerValue(Context, InitVal, Context.IntTy)) { 6202 NewTy = Context.IntTy; 6203 NewWidth = IntWidth; 6204 NewSign = true; 6205 } else if (ECD->getType() == BestType) { 6206 // Already the right type! 6207 if (getLangOptions().CPlusPlus) 6208 // C++ [dcl.enum]p4: Following the closing brace of an 6209 // enum-specifier, each enumerator has the type of its 6210 // enumeration. 6211 ECD->setType(EnumType); 6212 continue; 6213 } else { 6214 NewTy = BestType; 6215 NewWidth = BestWidth; 6216 NewSign = BestType->isSignedIntegerType(); 6217 } 6218 6219 // Adjust the APSInt value. 6220 InitVal.extOrTrunc(NewWidth); 6221 InitVal.setIsSigned(NewSign); 6222 ECD->setInitVal(InitVal); 6223 6224 // Adjust the Expr initializer and type. 6225 if (ECD->getInitExpr()) 6226 ECD->setInitExpr(new (Context) ImplicitCastExpr(NewTy, 6227 CastExpr::CK_IntegralCast, 6228 ECD->getInitExpr(), 6229 /*isLvalue=*/false)); 6230 if (getLangOptions().CPlusPlus) 6231 // C++ [dcl.enum]p4: Following the closing brace of an 6232 // enum-specifier, each enumerator has the type of its 6233 // enumeration. 6234 ECD->setType(EnumType); 6235 else 6236 ECD->setType(NewTy); 6237 } 6238 6239 Enum->completeDefinition(BestType, BestPromotionType); 6240} 6241 6242Sema::DeclPtrTy Sema::ActOnFileScopeAsmDecl(SourceLocation Loc, 6243 ExprArg expr) { 6244 StringLiteral *AsmString = cast<StringLiteral>(expr.takeAs<Expr>()); 6245 6246 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext, 6247 Loc, AsmString); 6248 CurContext->addDecl(New); 6249 return DeclPtrTy::make(New); 6250} 6251 6252void Sema::ActOnPragmaWeakID(IdentifierInfo* Name, 6253 SourceLocation PragmaLoc, 6254 SourceLocation NameLoc) { 6255 Decl *PrevDecl = LookupSingleName(TUScope, Name, LookupOrdinaryName); 6256 6257 if (PrevDecl) { 6258 PrevDecl->addAttr(::new (Context) WeakAttr()); 6259 } else { 6260 (void)WeakUndeclaredIdentifiers.insert( 6261 std::pair<IdentifierInfo*,WeakInfo> 6262 (Name, WeakInfo((IdentifierInfo*)0, NameLoc))); 6263 } 6264} 6265 6266void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name, 6267 IdentifierInfo* AliasName, 6268 SourceLocation PragmaLoc, 6269 SourceLocation NameLoc, 6270 SourceLocation AliasNameLoc) { 6271 Decl *PrevDecl = LookupSingleName(TUScope, AliasName, LookupOrdinaryName); 6272 WeakInfo W = WeakInfo(Name, NameLoc); 6273 6274 if (PrevDecl) { 6275 if (!PrevDecl->hasAttr<AliasAttr>()) 6276 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl)) 6277 DeclApplyPragmaWeak(TUScope, ND, W); 6278 } else { 6279 (void)WeakUndeclaredIdentifiers.insert( 6280 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W)); 6281 } 6282} 6283