SemaDecl.cpp revision af2094e7cecadf36667deb61a83587ffdd979bd3
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/AST/APValue.h" 18#include "clang/AST/ASTConsumer.h" 19#include "clang/AST/ASTContext.h" 20#include "clang/AST/CXXInheritance.h" 21#include "clang/AST/DeclTemplate.h" 22#include "clang/AST/ExprCXX.h" 23#include "clang/AST/StmtCXX.h" 24#include "clang/Parse/DeclSpec.h" 25#include "clang/Parse/ParseDiagnostic.h" 26#include "clang/Parse/Template.h" 27#include "clang/Basic/PartialDiagnostic.h" 28#include "clang/Basic/SourceManager.h" 29#include "clang/Basic/TargetInfo.h" 30// FIXME: layering (ideally, Sema shouldn't be dependent on Lex API's) 31#include "clang/Lex/Preprocessor.h" 32#include "clang/Lex/HeaderSearch.h" 33#include "llvm/ADT/Triple.h" 34#include <algorithm> 35#include <cstring> 36#include <functional> 37using namespace clang; 38 39/// getDeclName - Return a pretty name for the specified decl if possible, or 40/// an empty string if not. This is used for pretty crash reporting. 41std::string Sema::getDeclName(DeclPtrTy d) { 42 Decl *D = d.getAs<Decl>(); 43 if (NamedDecl *DN = dyn_cast_or_null<NamedDecl>(D)) 44 return DN->getQualifiedNameAsString(); 45 return ""; 46} 47 48Sema::DeclGroupPtrTy Sema::ConvertDeclToDeclGroup(DeclPtrTy Ptr) { 49 return DeclGroupPtrTy::make(DeclGroupRef(Ptr.getAs<Decl>())); 50} 51 52/// \brief If the identifier refers to a type name within this scope, 53/// return the declaration of that type. 54/// 55/// This routine performs ordinary name lookup of the identifier II 56/// within the given scope, with optional C++ scope specifier SS, to 57/// determine whether the name refers to a type. If so, returns an 58/// opaque pointer (actually a QualType) corresponding to that 59/// type. Otherwise, returns NULL. 60/// 61/// If name lookup results in an ambiguity, this routine will complain 62/// and then return NULL. 63Sema::TypeTy *Sema::getTypeName(IdentifierInfo &II, SourceLocation NameLoc, 64 Scope *S, const CXXScopeSpec *SS, 65 bool isClassName, 66 TypeTy *ObjectTypePtr) { 67 // Determine where we will perform name lookup. 68 DeclContext *LookupCtx = 0; 69 if (ObjectTypePtr) { 70 QualType ObjectType = QualType::getFromOpaquePtr(ObjectTypePtr); 71 if (ObjectType->isRecordType()) 72 LookupCtx = computeDeclContext(ObjectType); 73 } else if (SS && SS->isNotEmpty()) { 74 LookupCtx = computeDeclContext(*SS, false); 75 76 if (!LookupCtx) { 77 if (isDependentScopeSpecifier(*SS)) { 78 // C++ [temp.res]p3: 79 // A qualified-id that refers to a type and in which the 80 // nested-name-specifier depends on a template-parameter (14.6.2) 81 // shall be prefixed by the keyword typename to indicate that the 82 // qualified-id denotes a type, forming an 83 // elaborated-type-specifier (7.1.5.3). 84 // 85 // We therefore do not perform any name lookup if the result would 86 // refer to a member of an unknown specialization. 87 if (!isClassName) 88 return 0; 89 90 // We know from the grammar that this name refers to a type, so build a 91 // DependentNameType node to describe the type. 92 // FIXME: Record somewhere that this DependentNameType node has no "typename" 93 // keyword associated with it. 94 return CheckTypenameType((NestedNameSpecifier *)SS->getScopeRep(), 95 II, SS->getRange()).getAsOpaquePtr(); 96 } 97 98 return 0; 99 } 100 101 if (!LookupCtx->isDependentContext() && RequireCompleteDeclContext(*SS)) 102 return 0; 103 } 104 105 // FIXME: LookupNestedNameSpecifierName isn't the right kind of 106 // lookup for class-names. 107 LookupNameKind Kind = isClassName ? LookupNestedNameSpecifierName : 108 LookupOrdinaryName; 109 LookupResult Result(*this, &II, NameLoc, Kind); 110 if (LookupCtx) { 111 // Perform "qualified" name lookup into the declaration context we 112 // computed, which is either the type of the base of a member access 113 // expression or the declaration context associated with a prior 114 // nested-name-specifier. 115 LookupQualifiedName(Result, LookupCtx); 116 117 if (ObjectTypePtr && Result.empty()) { 118 // C++ [basic.lookup.classref]p3: 119 // If the unqualified-id is ~type-name, the type-name is looked up 120 // in the context of the entire postfix-expression. If the type T of 121 // the object expression is of a class type C, the type-name is also 122 // looked up in the scope of class C. At least one of the lookups shall 123 // find a name that refers to (possibly cv-qualified) T. 124 LookupName(Result, S); 125 } 126 } else { 127 // Perform unqualified name lookup. 128 LookupName(Result, S); 129 } 130 131 NamedDecl *IIDecl = 0; 132 switch (Result.getResultKind()) { 133 case LookupResult::NotFound: 134 case LookupResult::NotFoundInCurrentInstantiation: 135 case LookupResult::FoundOverloaded: 136 case LookupResult::FoundUnresolvedValue: 137 Result.suppressDiagnostics(); 138 return 0; 139 140 case LookupResult::Ambiguous: 141 // Recover from type-hiding ambiguities by hiding the type. We'll 142 // do the lookup again when looking for an object, and we can 143 // diagnose the error then. If we don't do this, then the error 144 // about hiding the type will be immediately followed by an error 145 // that only makes sense if the identifier was treated like a type. 146 if (Result.getAmbiguityKind() == LookupResult::AmbiguousTagHiding) { 147 Result.suppressDiagnostics(); 148 return 0; 149 } 150 151 // Look to see if we have a type anywhere in the list of results. 152 for (LookupResult::iterator Res = Result.begin(), ResEnd = Result.end(); 153 Res != ResEnd; ++Res) { 154 if (isa<TypeDecl>(*Res) || isa<ObjCInterfaceDecl>(*Res)) { 155 if (!IIDecl || 156 (*Res)->getLocation().getRawEncoding() < 157 IIDecl->getLocation().getRawEncoding()) 158 IIDecl = *Res; 159 } 160 } 161 162 if (!IIDecl) { 163 // None of the entities we found is a type, so there is no way 164 // to even assume that the result is a type. In this case, don't 165 // complain about the ambiguity. The parser will either try to 166 // perform this lookup again (e.g., as an object name), which 167 // will produce the ambiguity, or will complain that it expected 168 // a type name. 169 Result.suppressDiagnostics(); 170 return 0; 171 } 172 173 // We found a type within the ambiguous lookup; diagnose the 174 // ambiguity and then return that type. This might be the right 175 // answer, or it might not be, but it suppresses any attempt to 176 // perform the name lookup again. 177 break; 178 179 case LookupResult::Found: 180 IIDecl = Result.getFoundDecl(); 181 break; 182 } 183 184 assert(IIDecl && "Didn't find decl"); 185 186 QualType T; 187 if (TypeDecl *TD = dyn_cast<TypeDecl>(IIDecl)) { 188 DiagnoseUseOfDecl(IIDecl, NameLoc); 189 190 if (T.isNull()) 191 T = Context.getTypeDeclType(TD); 192 193 if (SS) 194 T = getQualifiedNameType(*SS, T); 195 196 } else if (ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(IIDecl)) { 197 T = Context.getObjCInterfaceType(IDecl); 198 } else if (UnresolvedUsingTypenameDecl *UUDecl = 199 dyn_cast<UnresolvedUsingTypenameDecl>(IIDecl)) { 200 // FIXME: preserve source structure information. 201 T = Context.getDependentNameType(ETK_None, 202 UUDecl->getTargetNestedNameSpecifier(), 203 &II); 204 } else { 205 // If it's not plausibly a type, suppress diagnostics. 206 Result.suppressDiagnostics(); 207 return 0; 208 } 209 210 return T.getAsOpaquePtr(); 211} 212 213/// isTagName() - This method is called *for error recovery purposes only* 214/// to determine if the specified name is a valid tag name ("struct foo"). If 215/// so, this returns the TST for the tag corresponding to it (TST_enum, 216/// TST_union, TST_struct, TST_class). This is used to diagnose cases in C 217/// where the user forgot to specify the tag. 218DeclSpec::TST Sema::isTagName(IdentifierInfo &II, Scope *S) { 219 // Do a tag name lookup in this scope. 220 LookupResult R(*this, &II, SourceLocation(), LookupTagName); 221 LookupName(R, S, false); 222 R.suppressDiagnostics(); 223 if (R.getResultKind() == LookupResult::Found) 224 if (const TagDecl *TD = R.getAsSingle<TagDecl>()) { 225 switch (TD->getTagKind()) { 226 case TagDecl::TK_struct: return DeclSpec::TST_struct; 227 case TagDecl::TK_union: return DeclSpec::TST_union; 228 case TagDecl::TK_class: return DeclSpec::TST_class; 229 case TagDecl::TK_enum: return DeclSpec::TST_enum; 230 } 231 } 232 233 return DeclSpec::TST_unspecified; 234} 235 236bool Sema::DiagnoseUnknownTypeName(const IdentifierInfo &II, 237 SourceLocation IILoc, 238 Scope *S, 239 const CXXScopeSpec *SS, 240 TypeTy *&SuggestedType) { 241 // We don't have anything to suggest (yet). 242 SuggestedType = 0; 243 244 // There may have been a typo in the name of the type. Look up typo 245 // results, in case we have something that we can suggest. 246 LookupResult Lookup(*this, &II, IILoc, LookupOrdinaryName, 247 NotForRedeclaration); 248 249 // FIXME: It would be nice if we could correct for typos in built-in 250 // names, such as "itn" for "int". 251 252 if (CorrectTypo(Lookup, S, SS) && Lookup.isSingleResult()) { 253 NamedDecl *Result = Lookup.getAsSingle<NamedDecl>(); 254 if ((isa<TypeDecl>(Result) || isa<ObjCInterfaceDecl>(Result)) && 255 !Result->isInvalidDecl()) { 256 // We found a similarly-named type or interface; suggest that. 257 if (!SS || !SS->isSet()) 258 Diag(IILoc, diag::err_unknown_typename_suggest) 259 << &II << Lookup.getLookupName() 260 << FixItHint::CreateReplacement(SourceRange(IILoc), 261 Result->getNameAsString()); 262 else if (DeclContext *DC = computeDeclContext(*SS, false)) 263 Diag(IILoc, diag::err_unknown_nested_typename_suggest) 264 << &II << DC << Lookup.getLookupName() << SS->getRange() 265 << FixItHint::CreateReplacement(SourceRange(IILoc), 266 Result->getNameAsString()); 267 else 268 llvm_unreachable("could not have corrected a typo here"); 269 270 Diag(Result->getLocation(), diag::note_previous_decl) 271 << Result->getDeclName(); 272 273 SuggestedType = getTypeName(*Result->getIdentifier(), IILoc, S, SS); 274 return true; 275 } 276 } 277 278 // FIXME: Should we move the logic that tries to recover from a missing tag 279 // (struct, union, enum) from Parser::ParseImplicitInt here, instead? 280 281 if (!SS || (!SS->isSet() && !SS->isInvalid())) 282 Diag(IILoc, diag::err_unknown_typename) << &II; 283 else if (DeclContext *DC = computeDeclContext(*SS, false)) 284 Diag(IILoc, diag::err_typename_nested_not_found) 285 << &II << DC << SS->getRange(); 286 else if (isDependentScopeSpecifier(*SS)) { 287 Diag(SS->getRange().getBegin(), diag::err_typename_missing) 288 << (NestedNameSpecifier *)SS->getScopeRep() << II.getName() 289 << SourceRange(SS->getRange().getBegin(), IILoc) 290 << FixItHint::CreateInsertion(SS->getRange().getBegin(), "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)) { 515 516 // White-list anything with an __attribute__((unused)) type. 517 QualType Ty = VD->getType(); 518 519 // Only look at the outermost level of typedef. 520 if (const TypedefType *TT = dyn_cast<TypedefType>(Ty)) { 521 if (TT->getDecl()->hasAttr<UnusedAttr>()) 522 return false; 523 } 524 525 if (const TagType *TT = Ty->getAs<TagType>()) { 526 const TagDecl *Tag = TT->getDecl(); 527 if (Tag->hasAttr<UnusedAttr>()) 528 return false; 529 530 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Tag)) { 531 if (!RD->hasTrivialConstructor()) 532 return false; 533 if (!RD->hasTrivialDestructor()) 534 return false; 535 } 536 } 537 538 // TODO: __attribute__((unused)) templates? 539 } 540 541 return true; 542} 543 544void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) { 545 if (S->decl_empty()) return; 546 assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) && 547 "Scope shouldn't contain decls!"); 548 549 for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end(); 550 I != E; ++I) { 551 Decl *TmpD = (*I).getAs<Decl>(); 552 assert(TmpD && "This decl didn't get pushed??"); 553 554 assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?"); 555 NamedDecl *D = cast<NamedDecl>(TmpD); 556 557 if (!D->getDeclName()) continue; 558 559 // Diagnose unused variables in this scope. 560 if (ShouldDiagnoseUnusedDecl(D) && 561 S->getNumErrorsAtStart() == getDiagnostics().getNumErrors()) 562 Diag(D->getLocation(), diag::warn_unused_variable) << D->getDeclName(); 563 564 // Remove this name from our lexical scope. 565 IdResolver.RemoveDecl(D); 566 } 567} 568 569/// getObjCInterfaceDecl - Look up a for a class declaration in the scope. 570/// return 0 if one not found. 571/// 572/// \param Id the name of the Objective-C class we're looking for. If 573/// typo-correction fixes this name, the Id will be updated 574/// to the fixed name. 575/// 576/// \param RecoverLoc if provided, this routine will attempt to 577/// recover from a typo in the name of an existing Objective-C class 578/// and, if successful, will return the lookup that results from 579/// typo-correction. 580ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *&Id, 581 SourceLocation RecoverLoc) { 582 // The third "scope" argument is 0 since we aren't enabling lazy built-in 583 // creation from this context. 584 NamedDecl *IDecl = LookupSingleName(TUScope, Id, LookupOrdinaryName); 585 586 if (!IDecl && !RecoverLoc.isInvalid()) { 587 // Perform typo correction at the given location, but only if we 588 // find an Objective-C class name. 589 LookupResult R(*this, Id, RecoverLoc, LookupOrdinaryName); 590 if (CorrectTypo(R, TUScope, 0) && 591 (IDecl = R.getAsSingle<ObjCInterfaceDecl>())) { 592 Diag(RecoverLoc, diag::err_undef_interface_suggest) 593 << Id << IDecl->getDeclName() 594 << FixItHint::CreateReplacement(RecoverLoc, IDecl->getNameAsString()); 595 Diag(IDecl->getLocation(), diag::note_previous_decl) 596 << IDecl->getDeclName(); 597 598 Id = IDecl->getIdentifier(); 599 } 600 } 601 602 return dyn_cast_or_null<ObjCInterfaceDecl>(IDecl); 603} 604 605/// getNonFieldDeclScope - Retrieves the innermost scope, starting 606/// from S, where a non-field would be declared. This routine copes 607/// with the difference between C and C++ scoping rules in structs and 608/// unions. For example, the following code is well-formed in C but 609/// ill-formed in C++: 610/// @code 611/// struct S6 { 612/// enum { BAR } e; 613/// }; 614/// 615/// void test_S6() { 616/// struct S6 a; 617/// a.e = BAR; 618/// } 619/// @endcode 620/// For the declaration of BAR, this routine will return a different 621/// scope. The scope S will be the scope of the unnamed enumeration 622/// within S6. In C++, this routine will return the scope associated 623/// with S6, because the enumeration's scope is a transparent 624/// context but structures can contain non-field names. In C, this 625/// routine will return the translation unit scope, since the 626/// enumeration's scope is a transparent context and structures cannot 627/// contain non-field names. 628Scope *Sema::getNonFieldDeclScope(Scope *S) { 629 while (((S->getFlags() & Scope::DeclScope) == 0) || 630 (S->getEntity() && 631 ((DeclContext *)S->getEntity())->isTransparentContext()) || 632 (S->isClassScope() && !getLangOptions().CPlusPlus)) 633 S = S->getParent(); 634 return S; 635} 636 637void Sema::InitBuiltinVaListType() { 638 if (!Context.getBuiltinVaListType().isNull()) 639 return; 640 641 IdentifierInfo *VaIdent = &Context.Idents.get("__builtin_va_list"); 642 NamedDecl *VaDecl = LookupSingleName(TUScope, VaIdent, LookupOrdinaryName); 643 TypedefDecl *VaTypedef = cast<TypedefDecl>(VaDecl); 644 Context.setBuiltinVaListType(Context.getTypedefType(VaTypedef)); 645} 646 647/// LazilyCreateBuiltin - The specified Builtin-ID was first used at 648/// file scope. lazily create a decl for it. ForRedeclaration is true 649/// if we're creating this built-in in anticipation of redeclaring the 650/// built-in. 651NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid, 652 Scope *S, bool ForRedeclaration, 653 SourceLocation Loc) { 654 Builtin::ID BID = (Builtin::ID)bid; 655 656 if (Context.BuiltinInfo.hasVAListUse(BID)) 657 InitBuiltinVaListType(); 658 659 ASTContext::GetBuiltinTypeError Error; 660 QualType R = Context.GetBuiltinType(BID, Error); 661 switch (Error) { 662 case ASTContext::GE_None: 663 // Okay 664 break; 665 666 case ASTContext::GE_Missing_stdio: 667 if (ForRedeclaration) 668 Diag(Loc, diag::err_implicit_decl_requires_stdio) 669 << Context.BuiltinInfo.GetName(BID); 670 return 0; 671 672 case ASTContext::GE_Missing_setjmp: 673 if (ForRedeclaration) 674 Diag(Loc, diag::err_implicit_decl_requires_setjmp) 675 << Context.BuiltinInfo.GetName(BID); 676 return 0; 677 } 678 679 if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) { 680 Diag(Loc, diag::ext_implicit_lib_function_decl) 681 << Context.BuiltinInfo.GetName(BID) 682 << R; 683 if (Context.BuiltinInfo.getHeaderName(BID) && 684 Diags.getDiagnosticLevel(diag::ext_implicit_lib_function_decl) 685 != Diagnostic::Ignored) 686 Diag(Loc, diag::note_please_include_header) 687 << Context.BuiltinInfo.getHeaderName(BID) 688 << Context.BuiltinInfo.GetName(BID); 689 } 690 691 FunctionDecl *New = FunctionDecl::Create(Context, 692 Context.getTranslationUnitDecl(), 693 Loc, II, R, /*TInfo=*/0, 694 FunctionDecl::Extern, false, 695 /*hasPrototype=*/true); 696 New->setImplicit(); 697 698 // Create Decl objects for each parameter, adding them to the 699 // FunctionDecl. 700 if (FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) { 701 llvm::SmallVector<ParmVarDecl*, 16> Params; 702 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) 703 Params.push_back(ParmVarDecl::Create(Context, New, SourceLocation(), 0, 704 FT->getArgType(i), /*TInfo=*/0, 705 VarDecl::None, 0)); 706 New->setParams(Params.data(), Params.size()); 707 } 708 709 AddKnownFunctionAttributes(New); 710 711 // TUScope is the translation-unit scope to insert this function into. 712 // FIXME: This is hideous. We need to teach PushOnScopeChains to 713 // relate Scopes to DeclContexts, and probably eliminate CurContext 714 // entirely, but we're not there yet. 715 DeclContext *SavedContext = CurContext; 716 CurContext = Context.getTranslationUnitDecl(); 717 PushOnScopeChains(New, TUScope); 718 CurContext = SavedContext; 719 return New; 720} 721 722/// MergeTypeDefDecl - We just parsed a typedef 'New' which has the 723/// same name and scope as a previous declaration 'Old'. Figure out 724/// how to resolve this situation, merging decls or emitting 725/// diagnostics as appropriate. If there was an error, set New to be invalid. 726/// 727void Sema::MergeTypeDefDecl(TypedefDecl *New, LookupResult &OldDecls) { 728 // If the new decl is known invalid already, don't bother doing any 729 // merging checks. 730 if (New->isInvalidDecl()) return; 731 732 // Allow multiple definitions for ObjC built-in typedefs. 733 // FIXME: Verify the underlying types are equivalent! 734 if (getLangOptions().ObjC1) { 735 const IdentifierInfo *TypeID = New->getIdentifier(); 736 switch (TypeID->getLength()) { 737 default: break; 738 case 2: 739 if (!TypeID->isStr("id")) 740 break; 741 Context.ObjCIdRedefinitionType = New->getUnderlyingType(); 742 // Install the built-in type for 'id', ignoring the current definition. 743 New->setTypeForDecl(Context.getObjCIdType().getTypePtr()); 744 return; 745 case 5: 746 if (!TypeID->isStr("Class")) 747 break; 748 Context.ObjCClassRedefinitionType = New->getUnderlyingType(); 749 // Install the built-in type for 'Class', ignoring the current definition. 750 New->setTypeForDecl(Context.getObjCClassType().getTypePtr()); 751 return; 752 case 3: 753 if (!TypeID->isStr("SEL")) 754 break; 755 Context.ObjCSelRedefinitionType = New->getUnderlyingType(); 756 // Install the built-in type for 'SEL', ignoring the current definition. 757 New->setTypeForDecl(Context.getObjCSelType().getTypePtr()); 758 return; 759 case 8: 760 if (!TypeID->isStr("Protocol")) 761 break; 762 Context.setObjCProtoType(New->getUnderlyingType()); 763 return; 764 } 765 // Fall through - the typedef name was not a builtin type. 766 } 767 768 // Verify the old decl was also a type. 769 TypeDecl *Old = OldDecls.getAsSingle<TypeDecl>(); 770 if (!Old) { 771 Diag(New->getLocation(), diag::err_redefinition_different_kind) 772 << New->getDeclName(); 773 774 NamedDecl *OldD = OldDecls.getRepresentativeDecl(); 775 if (OldD->getLocation().isValid()) 776 Diag(OldD->getLocation(), diag::note_previous_definition); 777 778 return New->setInvalidDecl(); 779 } 780 781 // If the old declaration is invalid, just give up here. 782 if (Old->isInvalidDecl()) 783 return New->setInvalidDecl(); 784 785 // Determine the "old" type we'll use for checking and diagnostics. 786 QualType OldType; 787 if (TypedefDecl *OldTypedef = dyn_cast<TypedefDecl>(Old)) 788 OldType = OldTypedef->getUnderlyingType(); 789 else 790 OldType = Context.getTypeDeclType(Old); 791 792 // If the typedef types are not identical, reject them in all languages and 793 // with any extensions enabled. 794 795 if (OldType != New->getUnderlyingType() && 796 Context.getCanonicalType(OldType) != 797 Context.getCanonicalType(New->getUnderlyingType())) { 798 Diag(New->getLocation(), diag::err_redefinition_different_typedef) 799 << New->getUnderlyingType() << OldType; 800 if (Old->getLocation().isValid()) 801 Diag(Old->getLocation(), diag::note_previous_definition); 802 return New->setInvalidDecl(); 803 } 804 805 // The types match. Link up the redeclaration chain if the old 806 // declaration was a typedef. 807 // FIXME: this is a potential source of wierdness if the type 808 // spellings don't match exactly. 809 if (isa<TypedefDecl>(Old)) 810 New->setPreviousDeclaration(cast<TypedefDecl>(Old)); 811 812 if (getLangOptions().Microsoft) 813 return; 814 815 if (getLangOptions().CPlusPlus) { 816 // C++ [dcl.typedef]p2: 817 // In a given non-class scope, a typedef specifier can be used to 818 // redefine the name of any type declared in that scope to refer 819 // to the type to which it already refers. 820 if (!isa<CXXRecordDecl>(CurContext)) 821 return; 822 823 // C++0x [dcl.typedef]p4: 824 // In a given class scope, a typedef specifier can be used to redefine 825 // any class-name declared in that scope that is not also a typedef-name 826 // to refer to the type to which it already refers. 827 // 828 // This wording came in via DR424, which was a correction to the 829 // wording in DR56, which accidentally banned code like: 830 // 831 // struct S { 832 // typedef struct A { } A; 833 // }; 834 // 835 // in the C++03 standard. We implement the C++0x semantics, which 836 // allow the above but disallow 837 // 838 // struct S { 839 // typedef int I; 840 // typedef int I; 841 // }; 842 // 843 // since that was the intent of DR56. 844 if (!isa<TypedefDecl >(Old)) 845 return; 846 847 Diag(New->getLocation(), diag::err_redefinition) 848 << New->getDeclName(); 849 Diag(Old->getLocation(), diag::note_previous_definition); 850 return New->setInvalidDecl(); 851 } 852 853 // If we have a redefinition of a typedef in C, emit a warning. This warning 854 // is normally mapped to an error, but can be controlled with 855 // -Wtypedef-redefinition. If either the original or the redefinition is 856 // in a system header, don't emit this for compatibility with GCC. 857 if (getDiagnostics().getSuppressSystemWarnings() && 858 (Context.getSourceManager().isInSystemHeader(Old->getLocation()) || 859 Context.getSourceManager().isInSystemHeader(New->getLocation()))) 860 return; 861 862 Diag(New->getLocation(), diag::warn_redefinition_of_typedef) 863 << New->getDeclName(); 864 Diag(Old->getLocation(), diag::note_previous_definition); 865 return; 866} 867 868/// DeclhasAttr - returns true if decl Declaration already has the target 869/// attribute. 870static bool 871DeclHasAttr(const Decl *decl, const Attr *target) { 872 for (const Attr *attr = decl->getAttrs(); attr; attr = attr->getNext()) 873 if (attr->getKind() == target->getKind()) 874 return true; 875 876 return false; 877} 878 879/// MergeAttributes - append attributes from the Old decl to the New one. 880static void MergeAttributes(Decl *New, Decl *Old, ASTContext &C) { 881 for (const Attr *attr = Old->getAttrs(); attr; attr = attr->getNext()) { 882 if (!DeclHasAttr(New, attr) && attr->isMerged()) { 883 Attr *NewAttr = attr->clone(C); 884 NewAttr->setInherited(true); 885 New->addAttr(NewAttr); 886 } 887 } 888} 889 890/// Used in MergeFunctionDecl to keep track of function parameters in 891/// C. 892struct GNUCompatibleParamWarning { 893 ParmVarDecl *OldParm; 894 ParmVarDecl *NewParm; 895 QualType PromotedType; 896}; 897 898 899/// getSpecialMember - get the special member enum for a method. 900static Sema::CXXSpecialMember getSpecialMember(ASTContext &Ctx, 901 const CXXMethodDecl *MD) { 902 if (const CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(MD)) { 903 if (Ctor->isDefaultConstructor()) 904 return Sema::CXXDefaultConstructor; 905 if (Ctor->isCopyConstructor()) 906 return Sema::CXXCopyConstructor; 907 } 908 909 if (isa<CXXDestructorDecl>(MD)) 910 return Sema::CXXDestructor; 911 912 assert(MD->isCopyAssignment() && "Must have copy assignment operator"); 913 return Sema::CXXCopyAssignment; 914} 915 916/// canREdefineFunction - checks if a function can be redefined. Currently, 917/// only extern inline functions can be redefined, and even then only in 918/// GNU89 mode. 919static bool canRedefineFunction(const FunctionDecl *FD, 920 const LangOptions& LangOpts) { 921 return (LangOpts.GNUMode && !LangOpts.C99 && !LangOpts.CPlusPlus && 922 FD->isInlineSpecified() && 923 FD->getStorageClass() == FunctionDecl::Extern); 924} 925 926/// MergeFunctionDecl - We just parsed a function 'New' from 927/// declarator D which has the same name and scope as a previous 928/// declaration 'Old'. Figure out how to resolve this situation, 929/// merging decls or emitting diagnostics as appropriate. 930/// 931/// In C++, New and Old must be declarations that are not 932/// overloaded. Use IsOverload to determine whether New and Old are 933/// overloaded, and to select the Old declaration that New should be 934/// merged with. 935/// 936/// Returns true if there was an error, false otherwise. 937bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD) { 938 // Verify the old decl was also a function. 939 FunctionDecl *Old = 0; 940 if (FunctionTemplateDecl *OldFunctionTemplate 941 = dyn_cast<FunctionTemplateDecl>(OldD)) 942 Old = OldFunctionTemplate->getTemplatedDecl(); 943 else 944 Old = dyn_cast<FunctionDecl>(OldD); 945 if (!Old) { 946 if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(OldD)) { 947 Diag(New->getLocation(), diag::err_using_decl_conflict_reverse); 948 Diag(Shadow->getTargetDecl()->getLocation(), 949 diag::note_using_decl_target); 950 Diag(Shadow->getUsingDecl()->getLocation(), 951 diag::note_using_decl) << 0; 952 return true; 953 } 954 955 Diag(New->getLocation(), diag::err_redefinition_different_kind) 956 << New->getDeclName(); 957 Diag(OldD->getLocation(), diag::note_previous_definition); 958 return true; 959 } 960 961 // Determine whether the previous declaration was a definition, 962 // implicit declaration, or a declaration. 963 diag::kind PrevDiag; 964 if (Old->isThisDeclarationADefinition()) 965 PrevDiag = diag::note_previous_definition; 966 else if (Old->isImplicit()) 967 PrevDiag = diag::note_previous_implicit_declaration; 968 else 969 PrevDiag = diag::note_previous_declaration; 970 971 QualType OldQType = Context.getCanonicalType(Old->getType()); 972 QualType NewQType = Context.getCanonicalType(New->getType()); 973 974 // Don't complain about this if we're in GNU89 mode and the old function 975 // is an extern inline function. 976 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) && 977 New->getStorageClass() == FunctionDecl::Static && 978 Old->getStorageClass() != FunctionDecl::Static && 979 !canRedefineFunction(Old, getLangOptions())) { 980 Diag(New->getLocation(), diag::err_static_non_static) 981 << New; 982 Diag(Old->getLocation(), PrevDiag); 983 return true; 984 } 985 986 // If a function is first declared with a calling convention, but is 987 // later declared or defined without one, the second decl assumes the 988 // calling convention of the first. 989 // 990 // For the new decl, we have to look at the NON-canonical type to tell the 991 // difference between a function that really doesn't have a calling 992 // convention and one that is declared cdecl. That's because in 993 // canonicalization (see ASTContext.cpp), cdecl is canonicalized away 994 // because it is the default calling convention. 995 // 996 // Note also that we DO NOT return at this point, because we still have 997 // other tests to run. 998 const FunctionType *OldType = OldQType->getAs<FunctionType>(); 999 const FunctionType *NewType = New->getType()->getAs<FunctionType>(); 1000 const FunctionType::ExtInfo OldTypeInfo = OldType->getExtInfo(); 1001 const FunctionType::ExtInfo NewTypeInfo = NewType->getExtInfo(); 1002 if (OldTypeInfo.getCC() != CC_Default && 1003 NewTypeInfo.getCC() == CC_Default) { 1004 NewQType = Context.getCallConvType(NewQType, OldTypeInfo.getCC()); 1005 New->setType(NewQType); 1006 NewQType = Context.getCanonicalType(NewQType); 1007 } else if (!Context.isSameCallConv(OldTypeInfo.getCC(), 1008 NewTypeInfo.getCC())) { 1009 // Calling conventions really aren't compatible, so complain. 1010 Diag(New->getLocation(), diag::err_cconv_change) 1011 << FunctionType::getNameForCallConv(NewTypeInfo.getCC()) 1012 << (OldTypeInfo.getCC() == CC_Default) 1013 << (OldTypeInfo.getCC() == CC_Default ? "" : 1014 FunctionType::getNameForCallConv(OldTypeInfo.getCC())); 1015 Diag(Old->getLocation(), diag::note_previous_declaration); 1016 return true; 1017 } 1018 1019 // FIXME: diagnose the other way around? 1020 if (OldType->getNoReturnAttr() && 1021 !NewType->getNoReturnAttr()) { 1022 NewQType = Context.getNoReturnType(NewQType); 1023 New->setType(NewQType); 1024 assert(NewQType.isCanonical()); 1025 } 1026 1027 if (getLangOptions().CPlusPlus) { 1028 // (C++98 13.1p2): 1029 // Certain function declarations cannot be overloaded: 1030 // -- Function declarations that differ only in the return type 1031 // cannot be overloaded. 1032 QualType OldReturnType 1033 = cast<FunctionType>(OldQType.getTypePtr())->getResultType(); 1034 QualType NewReturnType 1035 = cast<FunctionType>(NewQType.getTypePtr())->getResultType(); 1036 if (OldReturnType != NewReturnType) { 1037 Diag(New->getLocation(), diag::err_ovl_diff_return_type); 1038 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1039 return true; 1040 } 1041 1042 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 1043 const CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 1044 if (OldMethod && NewMethod) { 1045 if (!NewMethod->getFriendObjectKind() && 1046 NewMethod->getLexicalDeclContext()->isRecord()) { 1047 // -- Member function declarations with the same name and the 1048 // same parameter types cannot be overloaded if any of them 1049 // is a static member function declaration. 1050 if (OldMethod->isStatic() || NewMethod->isStatic()) { 1051 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 1052 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1053 return true; 1054 } 1055 1056 // C++ [class.mem]p1: 1057 // [...] A member shall not be declared twice in the 1058 // member-specification, except that a nested class or member 1059 // class template can be declared and then later defined. 1060 unsigned NewDiag; 1061 if (isa<CXXConstructorDecl>(OldMethod)) 1062 NewDiag = diag::err_constructor_redeclared; 1063 else if (isa<CXXDestructorDecl>(NewMethod)) 1064 NewDiag = diag::err_destructor_redeclared; 1065 else if (isa<CXXConversionDecl>(NewMethod)) 1066 NewDiag = diag::err_conv_function_redeclared; 1067 else 1068 NewDiag = diag::err_member_redeclared; 1069 1070 Diag(New->getLocation(), NewDiag); 1071 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1072 } else { 1073 if (OldMethod->isImplicit()) { 1074 Diag(NewMethod->getLocation(), 1075 diag::err_definition_of_implicitly_declared_member) 1076 << New << getSpecialMember(Context, OldMethod); 1077 1078 Diag(OldMethod->getLocation(), 1079 diag::note_previous_implicit_declaration); 1080 return true; 1081 } 1082 } 1083 } 1084 1085 // (C++98 8.3.5p3): 1086 // All declarations for a function shall agree exactly in both the 1087 // return type and the parameter-type-list. 1088 // attributes should be ignored when comparing. 1089 if (Context.getNoReturnType(OldQType, false) == 1090 Context.getNoReturnType(NewQType, false)) 1091 return MergeCompatibleFunctionDecls(New, Old); 1092 1093 // Fall through for conflicting redeclarations and redefinitions. 1094 } 1095 1096 // C: Function types need to be compatible, not identical. This handles 1097 // duplicate function decls like "void f(int); void f(enum X);" properly. 1098 if (!getLangOptions().CPlusPlus && 1099 Context.typesAreCompatible(OldQType, NewQType)) { 1100 const FunctionType *OldFuncType = OldQType->getAs<FunctionType>(); 1101 const FunctionType *NewFuncType = NewQType->getAs<FunctionType>(); 1102 const FunctionProtoType *OldProto = 0; 1103 if (isa<FunctionNoProtoType>(NewFuncType) && 1104 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) { 1105 // The old declaration provided a function prototype, but the 1106 // new declaration does not. Merge in the prototype. 1107 assert(!OldProto->hasExceptionSpec() && "Exception spec in C"); 1108 llvm::SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(), 1109 OldProto->arg_type_end()); 1110 NewQType = Context.getFunctionType(NewFuncType->getResultType(), 1111 ParamTypes.data(), ParamTypes.size(), 1112 OldProto->isVariadic(), 1113 OldProto->getTypeQuals(), 1114 false, false, 0, 0, 1115 OldProto->getExtInfo()); 1116 New->setType(NewQType); 1117 New->setHasInheritedPrototype(); 1118 1119 // Synthesize a parameter for each argument type. 1120 llvm::SmallVector<ParmVarDecl*, 16> Params; 1121 for (FunctionProtoType::arg_type_iterator 1122 ParamType = OldProto->arg_type_begin(), 1123 ParamEnd = OldProto->arg_type_end(); 1124 ParamType != ParamEnd; ++ParamType) { 1125 ParmVarDecl *Param = ParmVarDecl::Create(Context, New, 1126 SourceLocation(), 0, 1127 *ParamType, /*TInfo=*/0, 1128 VarDecl::None, 0); 1129 Param->setImplicit(); 1130 Params.push_back(Param); 1131 } 1132 1133 New->setParams(Params.data(), Params.size()); 1134 } 1135 1136 return MergeCompatibleFunctionDecls(New, Old); 1137 } 1138 1139 // GNU C permits a K&R definition to follow a prototype declaration 1140 // if the declared types of the parameters in the K&R definition 1141 // match the types in the prototype declaration, even when the 1142 // promoted types of the parameters from the K&R definition differ 1143 // from the types in the prototype. GCC then keeps the types from 1144 // the prototype. 1145 // 1146 // If a variadic prototype is followed by a non-variadic K&R definition, 1147 // the K&R definition becomes variadic. This is sort of an edge case, but 1148 // it's legal per the standard depending on how you read C99 6.7.5.3p15 and 1149 // C99 6.9.1p8. 1150 if (!getLangOptions().CPlusPlus && 1151 Old->hasPrototype() && !New->hasPrototype() && 1152 New->getType()->getAs<FunctionProtoType>() && 1153 Old->getNumParams() == New->getNumParams()) { 1154 llvm::SmallVector<QualType, 16> ArgTypes; 1155 llvm::SmallVector<GNUCompatibleParamWarning, 16> Warnings; 1156 const FunctionProtoType *OldProto 1157 = Old->getType()->getAs<FunctionProtoType>(); 1158 const FunctionProtoType *NewProto 1159 = New->getType()->getAs<FunctionProtoType>(); 1160 1161 // Determine whether this is the GNU C extension. 1162 QualType MergedReturn = Context.mergeTypes(OldProto->getResultType(), 1163 NewProto->getResultType()); 1164 bool LooseCompatible = !MergedReturn.isNull(); 1165 for (unsigned Idx = 0, End = Old->getNumParams(); 1166 LooseCompatible && Idx != End; ++Idx) { 1167 ParmVarDecl *OldParm = Old->getParamDecl(Idx); 1168 ParmVarDecl *NewParm = New->getParamDecl(Idx); 1169 if (Context.typesAreCompatible(OldParm->getType(), 1170 NewProto->getArgType(Idx))) { 1171 ArgTypes.push_back(NewParm->getType()); 1172 } else if (Context.typesAreCompatible(OldParm->getType(), 1173 NewParm->getType())) { 1174 GNUCompatibleParamWarning Warn 1175 = { OldParm, NewParm, NewProto->getArgType(Idx) }; 1176 Warnings.push_back(Warn); 1177 ArgTypes.push_back(NewParm->getType()); 1178 } else 1179 LooseCompatible = false; 1180 } 1181 1182 if (LooseCompatible) { 1183 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) { 1184 Diag(Warnings[Warn].NewParm->getLocation(), 1185 diag::ext_param_promoted_not_compatible_with_prototype) 1186 << Warnings[Warn].PromotedType 1187 << Warnings[Warn].OldParm->getType(); 1188 Diag(Warnings[Warn].OldParm->getLocation(), 1189 diag::note_previous_declaration); 1190 } 1191 1192 New->setType(Context.getFunctionType(MergedReturn, &ArgTypes[0], 1193 ArgTypes.size(), 1194 OldProto->isVariadic(), 0, 1195 false, false, 0, 0, 1196 OldProto->getExtInfo())); 1197 return MergeCompatibleFunctionDecls(New, Old); 1198 } 1199 1200 // Fall through to diagnose conflicting types. 1201 } 1202 1203 // A function that has already been declared has been redeclared or defined 1204 // with a different type- show appropriate diagnostic 1205 if (unsigned BuiltinID = Old->getBuiltinID()) { 1206 // The user has declared a builtin function with an incompatible 1207 // signature. 1208 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 1209 // The function the user is redeclaring is a library-defined 1210 // function like 'malloc' or 'printf'. Warn about the 1211 // redeclaration, then pretend that we don't know about this 1212 // library built-in. 1213 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; 1214 Diag(Old->getLocation(), diag::note_previous_builtin_declaration) 1215 << Old << Old->getType(); 1216 New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin); 1217 Old->setInvalidDecl(); 1218 return false; 1219 } 1220 1221 PrevDiag = diag::note_previous_builtin_declaration; 1222 } 1223 1224 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 1225 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1226 return true; 1227} 1228 1229/// \brief Completes the merge of two function declarations that are 1230/// known to be compatible. 1231/// 1232/// This routine handles the merging of attributes and other 1233/// properties of function declarations form the old declaration to 1234/// the new declaration, once we know that New is in fact a 1235/// redeclaration of Old. 1236/// 1237/// \returns false 1238bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old) { 1239 // Merge the attributes 1240 MergeAttributes(New, Old, Context); 1241 1242 // Merge the storage class. 1243 if (Old->getStorageClass() != FunctionDecl::Extern && 1244 Old->getStorageClass() != FunctionDecl::None) 1245 New->setStorageClass(Old->getStorageClass()); 1246 1247 // Merge "pure" flag. 1248 if (Old->isPure()) 1249 New->setPure(); 1250 1251 // Merge the "deleted" flag. 1252 if (Old->isDeleted()) 1253 New->setDeleted(); 1254 1255 if (getLangOptions().CPlusPlus) 1256 return MergeCXXFunctionDecl(New, Old); 1257 1258 return false; 1259} 1260 1261/// MergeVarDecl - We just parsed a variable 'New' which has the same name 1262/// and scope as a previous declaration 'Old'. Figure out how to resolve this 1263/// situation, merging decls or emitting diagnostics as appropriate. 1264/// 1265/// Tentative definition rules (C99 6.9.2p2) are checked by 1266/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 1267/// definitions here, since the initializer hasn't been attached. 1268/// 1269void Sema::MergeVarDecl(VarDecl *New, LookupResult &Previous) { 1270 // If the new decl is already invalid, don't do any other checking. 1271 if (New->isInvalidDecl()) 1272 return; 1273 1274 // Verify the old decl was also a variable. 1275 VarDecl *Old = 0; 1276 if (!Previous.isSingleResult() || 1277 !(Old = dyn_cast<VarDecl>(Previous.getFoundDecl()))) { 1278 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1279 << New->getDeclName(); 1280 Diag(Previous.getRepresentativeDecl()->getLocation(), 1281 diag::note_previous_definition); 1282 return New->setInvalidDecl(); 1283 } 1284 1285 MergeAttributes(New, Old, Context); 1286 1287 // Merge the types 1288 QualType MergedT; 1289 if (getLangOptions().CPlusPlus) { 1290 if (Context.hasSameType(New->getType(), Old->getType())) 1291 MergedT = New->getType(); 1292 // C++ [basic.link]p10: 1293 // [...] the types specified by all declarations referring to a given 1294 // object or function shall be identical, except that declarations for an 1295 // array object can specify array types that differ by the presence or 1296 // absence of a major array bound (8.3.4). 1297 else if (Old->getType()->isIncompleteArrayType() && 1298 New->getType()->isArrayType()) { 1299 CanQual<ArrayType> OldArray 1300 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 1301 CanQual<ArrayType> NewArray 1302 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 1303 if (OldArray->getElementType() == NewArray->getElementType()) 1304 MergedT = New->getType(); 1305 } else if (Old->getType()->isArrayType() && 1306 New->getType()->isIncompleteArrayType()) { 1307 CanQual<ArrayType> OldArray 1308 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 1309 CanQual<ArrayType> NewArray 1310 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 1311 if (OldArray->getElementType() == NewArray->getElementType()) 1312 MergedT = Old->getType(); 1313 } 1314 } else { 1315 MergedT = Context.mergeTypes(New->getType(), Old->getType()); 1316 } 1317 if (MergedT.isNull()) { 1318 Diag(New->getLocation(), diag::err_redefinition_different_type) 1319 << New->getDeclName(); 1320 Diag(Old->getLocation(), diag::note_previous_definition); 1321 return New->setInvalidDecl(); 1322 } 1323 New->setType(MergedT); 1324 1325 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 1326 if (New->getStorageClass() == VarDecl::Static && 1327 (Old->getStorageClass() == VarDecl::None || Old->hasExternalStorage())) { 1328 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 1329 Diag(Old->getLocation(), diag::note_previous_definition); 1330 return New->setInvalidDecl(); 1331 } 1332 // C99 6.2.2p4: 1333 // For an identifier declared with the storage-class specifier 1334 // extern in a scope in which a prior declaration of that 1335 // identifier is visible,23) if the prior declaration specifies 1336 // internal or external linkage, the linkage of the identifier at 1337 // the later declaration is the same as the linkage specified at 1338 // the prior declaration. If no prior declaration is visible, or 1339 // if the prior declaration specifies no linkage, then the 1340 // identifier has external linkage. 1341 if (New->hasExternalStorage() && Old->hasLinkage()) 1342 /* Okay */; 1343 else if (New->getStorageClass() != VarDecl::Static && 1344 Old->getStorageClass() == VarDecl::Static) { 1345 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 1346 Diag(Old->getLocation(), diag::note_previous_definition); 1347 return New->setInvalidDecl(); 1348 } 1349 1350 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 1351 1352 // FIXME: The test for external storage here seems wrong? We still 1353 // need to check for mismatches. 1354 if (!New->hasExternalStorage() && !New->isFileVarDecl() && 1355 // Don't complain about out-of-line definitions of static members. 1356 !(Old->getLexicalDeclContext()->isRecord() && 1357 !New->getLexicalDeclContext()->isRecord())) { 1358 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 1359 Diag(Old->getLocation(), diag::note_previous_definition); 1360 return New->setInvalidDecl(); 1361 } 1362 1363 if (New->isThreadSpecified() && !Old->isThreadSpecified()) { 1364 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName(); 1365 Diag(Old->getLocation(), diag::note_previous_definition); 1366 } else if (!New->isThreadSpecified() && Old->isThreadSpecified()) { 1367 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName(); 1368 Diag(Old->getLocation(), diag::note_previous_definition); 1369 } 1370 1371 // C++ doesn't have tentative definitions, so go right ahead and check here. 1372 const VarDecl *Def; 1373 if (getLangOptions().CPlusPlus && 1374 New->isThisDeclarationADefinition() == VarDecl::Definition && 1375 (Def = Old->getDefinition())) { 1376 Diag(New->getLocation(), diag::err_redefinition) 1377 << New->getDeclName(); 1378 Diag(Def->getLocation(), diag::note_previous_definition); 1379 New->setInvalidDecl(); 1380 return; 1381 } 1382 1383 // Keep a chain of previous declarations. 1384 New->setPreviousDeclaration(Old); 1385 1386 // Inherit access appropriately. 1387 New->setAccess(Old->getAccess()); 1388} 1389 1390/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 1391/// no declarator (e.g. "struct foo;") is parsed. 1392Sema::DeclPtrTy Sema::ParsedFreeStandingDeclSpec(Scope *S, DeclSpec &DS) { 1393 // FIXME: Error on auto/register at file scope 1394 // FIXME: Error on inline/virtual/explicit 1395 // FIXME: Warn on useless __thread 1396 // FIXME: Warn on useless const/volatile 1397 // FIXME: Warn on useless static/extern/typedef/private_extern/mutable 1398 // FIXME: Warn on useless attributes 1399 Decl *TagD = 0; 1400 TagDecl *Tag = 0; 1401 if (DS.getTypeSpecType() == DeclSpec::TST_class || 1402 DS.getTypeSpecType() == DeclSpec::TST_struct || 1403 DS.getTypeSpecType() == DeclSpec::TST_union || 1404 DS.getTypeSpecType() == DeclSpec::TST_enum) { 1405 TagD = static_cast<Decl *>(DS.getTypeRep()); 1406 1407 if (!TagD) // We probably had an error 1408 return DeclPtrTy(); 1409 1410 // Note that the above type specs guarantee that the 1411 // type rep is a Decl, whereas in many of the others 1412 // it's a Type. 1413 Tag = dyn_cast<TagDecl>(TagD); 1414 } 1415 1416 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 1417 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 1418 // or incomplete types shall not be restrict-qualified." 1419 if (TypeQuals & DeclSpec::TQ_restrict) 1420 Diag(DS.getRestrictSpecLoc(), 1421 diag::err_typecheck_invalid_restrict_not_pointer_noarg) 1422 << DS.getSourceRange(); 1423 } 1424 1425 if (DS.isFriendSpecified()) { 1426 // If we're dealing with a class template decl, assume that the 1427 // template routines are handling it. 1428 if (TagD && isa<ClassTemplateDecl>(TagD)) 1429 return DeclPtrTy(); 1430 return ActOnFriendTypeDecl(S, DS, MultiTemplateParamsArg(*this, 0, 0)); 1431 } 1432 1433 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 1434 // If there are attributes in the DeclSpec, apply them to the record. 1435 if (const AttributeList *AL = DS.getAttributes()) 1436 ProcessDeclAttributeList(S, Record, AL); 1437 1438 if (!Record->getDeclName() && Record->isDefinition() && 1439 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { 1440 if (getLangOptions().CPlusPlus || 1441 Record->getDeclContext()->isRecord()) 1442 return BuildAnonymousStructOrUnion(S, DS, Record); 1443 1444 Diag(DS.getSourceRange().getBegin(), diag::err_no_declarators) 1445 << DS.getSourceRange(); 1446 } 1447 1448 // Microsoft allows unnamed struct/union fields. Don't complain 1449 // about them. 1450 // FIXME: Should we support Microsoft's extensions in this area? 1451 if (Record->getDeclName() && getLangOptions().Microsoft) 1452 return DeclPtrTy::make(Tag); 1453 } 1454 1455 if (!DS.isMissingDeclaratorOk() && 1456 DS.getTypeSpecType() != DeclSpec::TST_error) { 1457 // Warn about typedefs of enums without names, since this is an 1458 // extension in both Microsoft an GNU. 1459 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 1460 Tag && isa<EnumDecl>(Tag)) { 1461 Diag(DS.getSourceRange().getBegin(), diag::ext_typedef_without_a_name) 1462 << DS.getSourceRange(); 1463 return DeclPtrTy::make(Tag); 1464 } 1465 1466 Diag(DS.getSourceRange().getBegin(), diag::err_no_declarators) 1467 << DS.getSourceRange(); 1468 return DeclPtrTy(); 1469 } 1470 1471 return DeclPtrTy::make(Tag); 1472} 1473 1474/// We are trying to inject an anonymous member into the given scope; 1475/// check if there's an existing declaration that can't be overloaded. 1476/// 1477/// \return true if this is a forbidden redeclaration 1478static bool CheckAnonMemberRedeclaration(Sema &SemaRef, 1479 Scope *S, 1480 DeclContext *Owner, 1481 DeclarationName Name, 1482 SourceLocation NameLoc, 1483 unsigned diagnostic) { 1484 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupMemberName, 1485 Sema::ForRedeclaration); 1486 if (!SemaRef.LookupName(R, S)) return false; 1487 1488 if (R.getAsSingle<TagDecl>()) 1489 return false; 1490 1491 // Pick a representative declaration. 1492 NamedDecl *PrevDecl = R.getRepresentativeDecl()->getUnderlyingDecl(); 1493 if (PrevDecl && Owner->isRecord()) { 1494 RecordDecl *Record = cast<RecordDecl>(Owner); 1495 if (!SemaRef.isDeclInScope(PrevDecl, Record, S)) 1496 return false; 1497 } 1498 1499 SemaRef.Diag(NameLoc, diagnostic) << Name; 1500 SemaRef.Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 1501 1502 return true; 1503} 1504 1505/// InjectAnonymousStructOrUnionMembers - Inject the members of the 1506/// anonymous struct or union AnonRecord into the owning context Owner 1507/// and scope S. This routine will be invoked just after we realize 1508/// that an unnamed union or struct is actually an anonymous union or 1509/// struct, e.g., 1510/// 1511/// @code 1512/// union { 1513/// int i; 1514/// float f; 1515/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 1516/// // f into the surrounding scope.x 1517/// @endcode 1518/// 1519/// This routine is recursive, injecting the names of nested anonymous 1520/// structs/unions into the owning context and scope as well. 1521bool Sema::InjectAnonymousStructOrUnionMembers(Scope *S, DeclContext *Owner, 1522 RecordDecl *AnonRecord) { 1523 unsigned diagKind 1524 = AnonRecord->isUnion() ? diag::err_anonymous_union_member_redecl 1525 : diag::err_anonymous_struct_member_redecl; 1526 1527 bool Invalid = false; 1528 for (RecordDecl::field_iterator F = AnonRecord->field_begin(), 1529 FEnd = AnonRecord->field_end(); 1530 F != FEnd; ++F) { 1531 if ((*F)->getDeclName()) { 1532 if (CheckAnonMemberRedeclaration(*this, S, Owner, (*F)->getDeclName(), 1533 (*F)->getLocation(), diagKind)) { 1534 // C++ [class.union]p2: 1535 // The names of the members of an anonymous union shall be 1536 // distinct from the names of any other entity in the 1537 // scope in which the anonymous union is declared. 1538 Invalid = true; 1539 } else { 1540 // C++ [class.union]p2: 1541 // For the purpose of name lookup, after the anonymous union 1542 // definition, the members of the anonymous union are 1543 // considered to have been defined in the scope in which the 1544 // anonymous union is declared. 1545 Owner->makeDeclVisibleInContext(*F); 1546 S->AddDecl(DeclPtrTy::make(*F)); 1547 IdResolver.AddDecl(*F); 1548 } 1549 } else if (const RecordType *InnerRecordType 1550 = (*F)->getType()->getAs<RecordType>()) { 1551 RecordDecl *InnerRecord = InnerRecordType->getDecl(); 1552 if (InnerRecord->isAnonymousStructOrUnion()) 1553 Invalid = Invalid || 1554 InjectAnonymousStructOrUnionMembers(S, Owner, InnerRecord); 1555 } 1556 } 1557 1558 return Invalid; 1559} 1560 1561/// ActOnAnonymousStructOrUnion - Handle the declaration of an 1562/// anonymous structure or union. Anonymous unions are a C++ feature 1563/// (C++ [class.union]) and a GNU C extension; anonymous structures 1564/// are a GNU C and GNU C++ extension. 1565Sema::DeclPtrTy Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 1566 RecordDecl *Record) { 1567 DeclContext *Owner = Record->getDeclContext(); 1568 1569 // Diagnose whether this anonymous struct/union is an extension. 1570 if (Record->isUnion() && !getLangOptions().CPlusPlus) 1571 Diag(Record->getLocation(), diag::ext_anonymous_union); 1572 else if (!Record->isUnion()) 1573 Diag(Record->getLocation(), diag::ext_anonymous_struct); 1574 1575 // C and C++ require different kinds of checks for anonymous 1576 // structs/unions. 1577 bool Invalid = false; 1578 if (getLangOptions().CPlusPlus) { 1579 const char* PrevSpec = 0; 1580 unsigned DiagID; 1581 // C++ [class.union]p3: 1582 // Anonymous unions declared in a named namespace or in the 1583 // global namespace shall be declared static. 1584 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 1585 (isa<TranslationUnitDecl>(Owner) || 1586 (isa<NamespaceDecl>(Owner) && 1587 cast<NamespaceDecl>(Owner)->getDeclName()))) { 1588 Diag(Record->getLocation(), diag::err_anonymous_union_not_static); 1589 Invalid = true; 1590 1591 // Recover by adding 'static'. 1592 DS.SetStorageClassSpec(DeclSpec::SCS_static, SourceLocation(), 1593 PrevSpec, DiagID); 1594 } 1595 // C++ [class.union]p3: 1596 // A storage class is not allowed in a declaration of an 1597 // anonymous union in a class scope. 1598 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 1599 isa<RecordDecl>(Owner)) { 1600 Diag(DS.getStorageClassSpecLoc(), 1601 diag::err_anonymous_union_with_storage_spec); 1602 Invalid = true; 1603 1604 // Recover by removing the storage specifier. 1605 DS.SetStorageClassSpec(DeclSpec::SCS_unspecified, SourceLocation(), 1606 PrevSpec, DiagID); 1607 } 1608 1609 // C++ [class.union]p2: 1610 // The member-specification of an anonymous union shall only 1611 // define non-static data members. [Note: nested types and 1612 // functions cannot be declared within an anonymous union. ] 1613 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 1614 MemEnd = Record->decls_end(); 1615 Mem != MemEnd; ++Mem) { 1616 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 1617 // C++ [class.union]p3: 1618 // An anonymous union shall not have private or protected 1619 // members (clause 11). 1620 if (FD->getAccess() == AS_protected || FD->getAccess() == AS_private) { 1621 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 1622 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 1623 Invalid = true; 1624 } 1625 } else if ((*Mem)->isImplicit()) { 1626 // Any implicit members are fine. 1627 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 1628 // This is a type that showed up in an 1629 // elaborated-type-specifier inside the anonymous struct or 1630 // union, but which actually declares a type outside of the 1631 // anonymous struct or union. It's okay. 1632 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 1633 if (!MemRecord->isAnonymousStructOrUnion() && 1634 MemRecord->getDeclName()) { 1635 // This is a nested type declaration. 1636 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 1637 << (int)Record->isUnion(); 1638 Invalid = true; 1639 } 1640 } else { 1641 // We have something that isn't a non-static data 1642 // member. Complain about it. 1643 unsigned DK = diag::err_anonymous_record_bad_member; 1644 if (isa<TypeDecl>(*Mem)) 1645 DK = diag::err_anonymous_record_with_type; 1646 else if (isa<FunctionDecl>(*Mem)) 1647 DK = diag::err_anonymous_record_with_function; 1648 else if (isa<VarDecl>(*Mem)) 1649 DK = diag::err_anonymous_record_with_static; 1650 Diag((*Mem)->getLocation(), DK) 1651 << (int)Record->isUnion(); 1652 Invalid = true; 1653 } 1654 } 1655 } 1656 1657 if (!Record->isUnion() && !Owner->isRecord()) { 1658 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 1659 << (int)getLangOptions().CPlusPlus; 1660 Invalid = true; 1661 } 1662 1663 // Mock up a declarator. 1664 Declarator Dc(DS, Declarator::TypeNameContext); 1665 TypeSourceInfo *TInfo = 0; 1666 GetTypeForDeclarator(Dc, S, &TInfo); 1667 assert(TInfo && "couldn't build declarator info for anonymous struct/union"); 1668 1669 // Create a declaration for this anonymous struct/union. 1670 NamedDecl *Anon = 0; 1671 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 1672 Anon = FieldDecl::Create(Context, OwningClass, Record->getLocation(), 1673 /*IdentifierInfo=*/0, 1674 Context.getTypeDeclType(Record), 1675 TInfo, 1676 /*BitWidth=*/0, /*Mutable=*/false); 1677 Anon->setAccess(AS_public); 1678 if (getLangOptions().CPlusPlus) 1679 FieldCollector->Add(cast<FieldDecl>(Anon)); 1680 } else { 1681 VarDecl::StorageClass SC; 1682 switch (DS.getStorageClassSpec()) { 1683 default: assert(0 && "Unknown storage class!"); 1684 case DeclSpec::SCS_unspecified: SC = VarDecl::None; break; 1685 case DeclSpec::SCS_extern: SC = VarDecl::Extern; break; 1686 case DeclSpec::SCS_static: SC = VarDecl::Static; break; 1687 case DeclSpec::SCS_auto: SC = VarDecl::Auto; break; 1688 case DeclSpec::SCS_register: SC = VarDecl::Register; break; 1689 case DeclSpec::SCS_private_extern: SC = VarDecl::PrivateExtern; break; 1690 case DeclSpec::SCS_mutable: 1691 // mutable can only appear on non-static class members, so it's always 1692 // an error here 1693 Diag(Record->getLocation(), diag::err_mutable_nonmember); 1694 Invalid = true; 1695 SC = VarDecl::None; 1696 break; 1697 } 1698 1699 Anon = VarDecl::Create(Context, Owner, Record->getLocation(), 1700 /*IdentifierInfo=*/0, 1701 Context.getTypeDeclType(Record), 1702 TInfo, 1703 SC); 1704 } 1705 Anon->setImplicit(); 1706 1707 // Add the anonymous struct/union object to the current 1708 // context. We'll be referencing this object when we refer to one of 1709 // its members. 1710 Owner->addDecl(Anon); 1711 1712 // Inject the members of the anonymous struct/union into the owning 1713 // context and into the identifier resolver chain for name lookup 1714 // purposes. 1715 if (InjectAnonymousStructOrUnionMembers(S, Owner, Record)) 1716 Invalid = true; 1717 1718 // Mark this as an anonymous struct/union type. Note that we do not 1719 // do this until after we have already checked and injected the 1720 // members of this anonymous struct/union type, because otherwise 1721 // the members could be injected twice: once by DeclContext when it 1722 // builds its lookup table, and once by 1723 // InjectAnonymousStructOrUnionMembers. 1724 Record->setAnonymousStructOrUnion(true); 1725 1726 if (Invalid) 1727 Anon->setInvalidDecl(); 1728 1729 return DeclPtrTy::make(Anon); 1730} 1731 1732 1733/// GetNameForDeclarator - Determine the full declaration name for the 1734/// given Declarator. 1735DeclarationName Sema::GetNameForDeclarator(Declarator &D) { 1736 return GetNameFromUnqualifiedId(D.getName()); 1737} 1738 1739/// \brief Retrieves the canonicalized name from a parsed unqualified-id. 1740DeclarationName Sema::GetNameFromUnqualifiedId(const UnqualifiedId &Name) { 1741 switch (Name.getKind()) { 1742 case UnqualifiedId::IK_Identifier: 1743 return DeclarationName(Name.Identifier); 1744 1745 case UnqualifiedId::IK_OperatorFunctionId: 1746 return Context.DeclarationNames.getCXXOperatorName( 1747 Name.OperatorFunctionId.Operator); 1748 1749 case UnqualifiedId::IK_LiteralOperatorId: 1750 return Context.DeclarationNames.getCXXLiteralOperatorName( 1751 Name.Identifier); 1752 1753 case UnqualifiedId::IK_ConversionFunctionId: { 1754 QualType Ty = GetTypeFromParser(Name.ConversionFunctionId); 1755 if (Ty.isNull()) 1756 return DeclarationName(); 1757 1758 return Context.DeclarationNames.getCXXConversionFunctionName( 1759 Context.getCanonicalType(Ty)); 1760 } 1761 1762 case UnqualifiedId::IK_ConstructorName: { 1763 QualType Ty = GetTypeFromParser(Name.ConstructorName); 1764 if (Ty.isNull()) 1765 return DeclarationName(); 1766 1767 return Context.DeclarationNames.getCXXConstructorName( 1768 Context.getCanonicalType(Ty)); 1769 } 1770 1771 case UnqualifiedId::IK_ConstructorTemplateId: { 1772 // In well-formed code, we can only have a constructor 1773 // template-id that refers to the current context, so go there 1774 // to find the actual type being constructed. 1775 CXXRecordDecl *CurClass = dyn_cast<CXXRecordDecl>(CurContext); 1776 if (!CurClass || CurClass->getIdentifier() != Name.TemplateId->Name) 1777 return DeclarationName(); 1778 1779 // Determine the type of the class being constructed. 1780 QualType CurClassType = Context.getTypeDeclType(CurClass); 1781 1782 // FIXME: Check two things: that the template-id names the same type as 1783 // CurClassType, and that the template-id does not occur when the name 1784 // was qualified. 1785 1786 return Context.DeclarationNames.getCXXConstructorName( 1787 Context.getCanonicalType(CurClassType)); 1788 } 1789 1790 case UnqualifiedId::IK_DestructorName: { 1791 QualType Ty = GetTypeFromParser(Name.DestructorName); 1792 if (Ty.isNull()) 1793 return DeclarationName(); 1794 1795 return Context.DeclarationNames.getCXXDestructorName( 1796 Context.getCanonicalType(Ty)); 1797 } 1798 1799 case UnqualifiedId::IK_TemplateId: { 1800 TemplateName TName 1801 = TemplateName::getFromVoidPointer(Name.TemplateId->Template); 1802 return Context.getNameForTemplate(TName); 1803 } 1804 } 1805 1806 assert(false && "Unknown name kind"); 1807 return DeclarationName(); 1808} 1809 1810/// isNearlyMatchingFunction - Determine whether the C++ functions 1811/// Declaration and Definition are "nearly" matching. This heuristic 1812/// is used to improve diagnostics in the case where an out-of-line 1813/// function definition doesn't match any declaration within 1814/// the class or namespace. 1815static bool isNearlyMatchingFunction(ASTContext &Context, 1816 FunctionDecl *Declaration, 1817 FunctionDecl *Definition) { 1818 if (Declaration->param_size() != Definition->param_size()) 1819 return false; 1820 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 1821 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 1822 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 1823 1824 if (!Context.hasSameUnqualifiedType(DeclParamTy.getNonReferenceType(), 1825 DefParamTy.getNonReferenceType())) 1826 return false; 1827 } 1828 1829 return true; 1830} 1831 1832Sema::DeclPtrTy 1833Sema::HandleDeclarator(Scope *S, Declarator &D, 1834 MultiTemplateParamsArg TemplateParamLists, 1835 bool IsFunctionDefinition) { 1836 DeclarationName Name = GetNameForDeclarator(D); 1837 1838 // All of these full declarators require an identifier. If it doesn't have 1839 // one, the ParsedFreeStandingDeclSpec action should be used. 1840 if (!Name) { 1841 if (!D.isInvalidType()) // Reject this if we think it is valid. 1842 Diag(D.getDeclSpec().getSourceRange().getBegin(), 1843 diag::err_declarator_need_ident) 1844 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 1845 return DeclPtrTy(); 1846 } 1847 1848 // The scope passed in may not be a decl scope. Zip up the scope tree until 1849 // we find one that is. 1850 while ((S->getFlags() & Scope::DeclScope) == 0 || 1851 (S->getFlags() & Scope::TemplateParamScope) != 0) 1852 S = S->getParent(); 1853 1854 // If this is an out-of-line definition of a member of a class template 1855 // or class template partial specialization, we may need to rebuild the 1856 // type specifier in the declarator. See RebuildTypeInCurrentInstantiation() 1857 // for more information. 1858 // FIXME: cope with decltype(expr) and typeof(expr) once the rebuilder can 1859 // handle expressions properly. 1860 DeclSpec &DS = const_cast<DeclSpec&>(D.getDeclSpec()); 1861 if (D.getCXXScopeSpec().isSet() && !D.getCXXScopeSpec().isInvalid() && 1862 isDependentScopeSpecifier(D.getCXXScopeSpec()) && 1863 (DS.getTypeSpecType() == DeclSpec::TST_typename || 1864 DS.getTypeSpecType() == DeclSpec::TST_typeofType || 1865 DS.getTypeSpecType() == DeclSpec::TST_typeofExpr || 1866 DS.getTypeSpecType() == DeclSpec::TST_decltype)) { 1867 if (DeclContext *DC = computeDeclContext(D.getCXXScopeSpec(), true)) { 1868 // FIXME: Preserve type source info. 1869 QualType T = GetTypeFromParser(DS.getTypeRep()); 1870 1871 DeclContext *SavedContext = CurContext; 1872 CurContext = DC; 1873 T = RebuildTypeInCurrentInstantiation(T, D.getIdentifierLoc(), Name); 1874 CurContext = SavedContext; 1875 1876 if (T.isNull()) 1877 return DeclPtrTy(); 1878 DS.UpdateTypeRep(T.getAsOpaquePtr()); 1879 } 1880 } 1881 1882 DeclContext *DC; 1883 NamedDecl *New; 1884 1885 TypeSourceInfo *TInfo = 0; 1886 QualType R = GetTypeForDeclarator(D, S, &TInfo); 1887 1888 LookupResult Previous(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 1889 ForRedeclaration); 1890 1891 // See if this is a redefinition of a variable in the same scope. 1892 if (D.getCXXScopeSpec().isInvalid()) { 1893 DC = CurContext; 1894 D.setInvalidType(); 1895 } else if (!D.getCXXScopeSpec().isSet()) { 1896 bool IsLinkageLookup = false; 1897 1898 // If the declaration we're planning to build will be a function 1899 // or object with linkage, then look for another declaration with 1900 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 1901 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 1902 /* Do nothing*/; 1903 else if (R->isFunctionType()) { 1904 if (CurContext->isFunctionOrMethod() || 1905 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 1906 IsLinkageLookup = true; 1907 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 1908 IsLinkageLookup = true; 1909 else if (CurContext->getLookupContext()->isTranslationUnit() && 1910 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 1911 IsLinkageLookup = true; 1912 1913 if (IsLinkageLookup) 1914 Previous.clear(LookupRedeclarationWithLinkage); 1915 1916 DC = CurContext; 1917 LookupName(Previous, S, /* CreateBuiltins = */ IsLinkageLookup); 1918 } else { // Something like "int foo::x;" 1919 DC = computeDeclContext(D.getCXXScopeSpec(), true); 1920 1921 if (!DC) { 1922 // If we could not compute the declaration context, it's because the 1923 // declaration context is dependent but does not refer to a class, 1924 // class template, or class template partial specialization. Complain 1925 // and return early, to avoid the coming semantic disaster. 1926 Diag(D.getIdentifierLoc(), 1927 diag::err_template_qualified_declarator_no_match) 1928 << (NestedNameSpecifier*)D.getCXXScopeSpec().getScopeRep() 1929 << D.getCXXScopeSpec().getRange(); 1930 return DeclPtrTy(); 1931 } 1932 1933 if (!DC->isDependentContext() && 1934 RequireCompleteDeclContext(D.getCXXScopeSpec())) 1935 return DeclPtrTy(); 1936 1937 if (isa<CXXRecordDecl>(DC) && !cast<CXXRecordDecl>(DC)->hasDefinition()) { 1938 Diag(D.getIdentifierLoc(), 1939 diag::err_member_def_undefined_record) 1940 << Name << DC << D.getCXXScopeSpec().getRange(); 1941 D.setInvalidType(); 1942 } 1943 1944 LookupQualifiedName(Previous, DC); 1945 1946 // Don't consider using declarations as previous declarations for 1947 // out-of-line members. 1948 RemoveUsingDecls(Previous); 1949 1950 // C++ 7.3.1.2p2: 1951 // Members (including explicit specializations of templates) of a named 1952 // namespace can also be defined outside that namespace by explicit 1953 // qualification of the name being defined, provided that the entity being 1954 // defined was already declared in the namespace and the definition appears 1955 // after the point of declaration in a namespace that encloses the 1956 // declarations namespace. 1957 // 1958 // Note that we only check the context at this point. We don't yet 1959 // have enough information to make sure that PrevDecl is actually 1960 // the declaration we want to match. For example, given: 1961 // 1962 // class X { 1963 // void f(); 1964 // void f(float); 1965 // }; 1966 // 1967 // void X::f(int) { } // ill-formed 1968 // 1969 // In this case, PrevDecl will point to the overload set 1970 // containing the two f's declared in X, but neither of them 1971 // matches. 1972 1973 // First check whether we named the global scope. 1974 if (isa<TranslationUnitDecl>(DC)) { 1975 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 1976 << Name << D.getCXXScopeSpec().getRange(); 1977 } else { 1978 DeclContext *Cur = CurContext; 1979 while (isa<LinkageSpecDecl>(Cur)) 1980 Cur = Cur->getParent(); 1981 if (!Cur->Encloses(DC)) { 1982 // The qualifying scope doesn't enclose the original declaration. 1983 // Emit diagnostic based on current scope. 1984 SourceLocation L = D.getIdentifierLoc(); 1985 SourceRange R = D.getCXXScopeSpec().getRange(); 1986 if (isa<FunctionDecl>(Cur)) 1987 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 1988 else 1989 Diag(L, diag::err_invalid_declarator_scope) 1990 << Name << cast<NamedDecl>(DC) << R; 1991 D.setInvalidType(); 1992 } 1993 } 1994 } 1995 1996 if (Previous.isSingleResult() && 1997 Previous.getFoundDecl()->isTemplateParameter()) { 1998 // Maybe we will complain about the shadowed template parameter. 1999 if (!D.isInvalidType()) 2000 if (DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), 2001 Previous.getFoundDecl())) 2002 D.setInvalidType(); 2003 2004 // Just pretend that we didn't see the previous declaration. 2005 Previous.clear(); 2006 } 2007 2008 // In C++, the previous declaration we find might be a tag type 2009 // (class or enum). In this case, the new declaration will hide the 2010 // tag type. Note that this does does not apply if we're declaring a 2011 // typedef (C++ [dcl.typedef]p4). 2012 if (Previous.isSingleTagDecl() && 2013 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 2014 Previous.clear(); 2015 2016 bool Redeclaration = false; 2017 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 2018 if (TemplateParamLists.size()) { 2019 Diag(D.getIdentifierLoc(), diag::err_template_typedef); 2020 return DeclPtrTy(); 2021 } 2022 2023 New = ActOnTypedefDeclarator(S, D, DC, R, TInfo, Previous, Redeclaration); 2024 } else if (R->isFunctionType()) { 2025 New = ActOnFunctionDeclarator(S, D, DC, R, TInfo, Previous, 2026 move(TemplateParamLists), 2027 IsFunctionDefinition, Redeclaration); 2028 } else { 2029 New = ActOnVariableDeclarator(S, D, DC, R, TInfo, Previous, 2030 move(TemplateParamLists), 2031 Redeclaration); 2032 } 2033 2034 if (New == 0) 2035 return DeclPtrTy(); 2036 2037 // If this has an identifier and is not an invalid redeclaration or 2038 // function template specialization, add it to the scope stack. 2039 if (Name && !(Redeclaration && New->isInvalidDecl())) 2040 PushOnScopeChains(New, S); 2041 2042 return DeclPtrTy::make(New); 2043} 2044 2045/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 2046/// types into constant array types in certain situations which would otherwise 2047/// be errors (for GCC compatibility). 2048static QualType TryToFixInvalidVariablyModifiedType(QualType T, 2049 ASTContext &Context, 2050 bool &SizeIsNegative) { 2051 // This method tries to turn a variable array into a constant 2052 // array even when the size isn't an ICE. This is necessary 2053 // for compatibility with code that depends on gcc's buggy 2054 // constant expression folding, like struct {char x[(int)(char*)2];} 2055 SizeIsNegative = false; 2056 2057 QualifierCollector Qs; 2058 const Type *Ty = Qs.strip(T); 2059 2060 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) { 2061 QualType Pointee = PTy->getPointeeType(); 2062 QualType FixedType = 2063 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative); 2064 if (FixedType.isNull()) return FixedType; 2065 FixedType = Context.getPointerType(FixedType); 2066 return Qs.apply(FixedType); 2067 } 2068 2069 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 2070 if (!VLATy) 2071 return QualType(); 2072 // FIXME: We should probably handle this case 2073 if (VLATy->getElementType()->isVariablyModifiedType()) 2074 return QualType(); 2075 2076 Expr::EvalResult EvalResult; 2077 if (!VLATy->getSizeExpr() || 2078 !VLATy->getSizeExpr()->Evaluate(EvalResult, Context) || 2079 !EvalResult.Val.isInt()) 2080 return QualType(); 2081 2082 llvm::APSInt &Res = EvalResult.Val.getInt(); 2083 if (Res >= llvm::APSInt(Res.getBitWidth(), Res.isUnsigned())) { 2084 // TODO: preserve the size expression in declarator info 2085 return Context.getConstantArrayType(VLATy->getElementType(), 2086 Res, ArrayType::Normal, 0); 2087 } 2088 2089 SizeIsNegative = true; 2090 return QualType(); 2091} 2092 2093/// \brief Register the given locally-scoped external C declaration so 2094/// that it can be found later for redeclarations 2095void 2096Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, 2097 const LookupResult &Previous, 2098 Scope *S) { 2099 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 2100 "Decl is not a locally-scoped decl!"); 2101 // Note that we have a locally-scoped external with this name. 2102 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 2103 2104 if (!Previous.isSingleResult()) 2105 return; 2106 2107 NamedDecl *PrevDecl = Previous.getFoundDecl(); 2108 2109 // If there was a previous declaration of this variable, it may be 2110 // in our identifier chain. Update the identifier chain with the new 2111 // declaration. 2112 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 2113 // The previous declaration was found on the identifer resolver 2114 // chain, so remove it from its scope. 2115 while (S && !S->isDeclScope(DeclPtrTy::make(PrevDecl))) 2116 S = S->getParent(); 2117 2118 if (S) 2119 S->RemoveDecl(DeclPtrTy::make(PrevDecl)); 2120 } 2121} 2122 2123/// \brief Diagnose function specifiers on a declaration of an identifier that 2124/// does not identify a function. 2125void Sema::DiagnoseFunctionSpecifiers(Declarator& D) { 2126 // FIXME: We should probably indicate the identifier in question to avoid 2127 // confusion for constructs like "inline int a(), b;" 2128 if (D.getDeclSpec().isInlineSpecified()) 2129 Diag(D.getDeclSpec().getInlineSpecLoc(), 2130 diag::err_inline_non_function); 2131 2132 if (D.getDeclSpec().isVirtualSpecified()) 2133 Diag(D.getDeclSpec().getVirtualSpecLoc(), 2134 diag::err_virtual_non_function); 2135 2136 if (D.getDeclSpec().isExplicitSpecified()) 2137 Diag(D.getDeclSpec().getExplicitSpecLoc(), 2138 diag::err_explicit_non_function); 2139} 2140 2141NamedDecl* 2142Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 2143 QualType R, TypeSourceInfo *TInfo, 2144 LookupResult &Previous, bool &Redeclaration) { 2145 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 2146 if (D.getCXXScopeSpec().isSet()) { 2147 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 2148 << D.getCXXScopeSpec().getRange(); 2149 D.setInvalidType(); 2150 // Pretend we didn't see the scope specifier. 2151 DC = CurContext; 2152 Previous.clear(); 2153 } 2154 2155 if (getLangOptions().CPlusPlus) { 2156 // Check that there are no default arguments (C++ only). 2157 CheckExtraCXXDefaultArguments(D); 2158 } 2159 2160 DiagnoseFunctionSpecifiers(D); 2161 2162 if (D.getDeclSpec().isThreadSpecified()) 2163 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 2164 2165 TypedefDecl *NewTD = ParseTypedefDecl(S, D, R, TInfo); 2166 if (!NewTD) return 0; 2167 2168 // Handle attributes prior to checking for duplicates in MergeVarDecl 2169 ProcessDeclAttributes(S, NewTD, D); 2170 2171 // Merge the decl with the existing one if appropriate. If the decl is 2172 // in an outer scope, it isn't the same thing. 2173 FilterLookupForScope(*this, Previous, DC, S, /*ConsiderLinkage*/ false); 2174 if (!Previous.empty()) { 2175 Redeclaration = true; 2176 MergeTypeDefDecl(NewTD, Previous); 2177 } 2178 2179 // C99 6.7.7p2: If a typedef name specifies a variably modified type 2180 // then it shall have block scope. 2181 QualType T = NewTD->getUnderlyingType(); 2182 if (T->isVariablyModifiedType()) { 2183 FunctionNeedsScopeChecking() = true; 2184 2185 if (S->getFnParent() == 0) { 2186 bool SizeIsNegative; 2187 QualType FixedTy = 2188 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative); 2189 if (!FixedTy.isNull()) { 2190 Diag(D.getIdentifierLoc(), diag::warn_illegal_constant_array_size); 2191 NewTD->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(FixedTy)); 2192 } else { 2193 if (SizeIsNegative) 2194 Diag(D.getIdentifierLoc(), diag::err_typecheck_negative_array_size); 2195 else if (T->isVariableArrayType()) 2196 Diag(D.getIdentifierLoc(), diag::err_vla_decl_in_file_scope); 2197 else 2198 Diag(D.getIdentifierLoc(), diag::err_vm_decl_in_file_scope); 2199 NewTD->setInvalidDecl(); 2200 } 2201 } 2202 } 2203 2204 // If this is the C FILE type, notify the AST context. 2205 if (IdentifierInfo *II = NewTD->getIdentifier()) 2206 if (!NewTD->isInvalidDecl() && 2207 NewTD->getDeclContext()->getLookupContext()->isTranslationUnit()) { 2208 if (II->isStr("FILE")) 2209 Context.setFILEDecl(NewTD); 2210 else if (II->isStr("jmp_buf")) 2211 Context.setjmp_bufDecl(NewTD); 2212 else if (II->isStr("sigjmp_buf")) 2213 Context.setsigjmp_bufDecl(NewTD); 2214 } 2215 2216 return NewTD; 2217} 2218 2219/// \brief Determines whether the given declaration is an out-of-scope 2220/// previous declaration. 2221/// 2222/// This routine should be invoked when name lookup has found a 2223/// previous declaration (PrevDecl) that is not in the scope where a 2224/// new declaration by the same name is being introduced. If the new 2225/// declaration occurs in a local scope, previous declarations with 2226/// linkage may still be considered previous declarations (C99 2227/// 6.2.2p4-5, C++ [basic.link]p6). 2228/// 2229/// \param PrevDecl the previous declaration found by name 2230/// lookup 2231/// 2232/// \param DC the context in which the new declaration is being 2233/// declared. 2234/// 2235/// \returns true if PrevDecl is an out-of-scope previous declaration 2236/// for a new delcaration with the same name. 2237static bool 2238isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 2239 ASTContext &Context) { 2240 if (!PrevDecl) 2241 return 0; 2242 2243 if (!PrevDecl->hasLinkage()) 2244 return false; 2245 2246 if (Context.getLangOptions().CPlusPlus) { 2247 // C++ [basic.link]p6: 2248 // If there is a visible declaration of an entity with linkage 2249 // having the same name and type, ignoring entities declared 2250 // outside the innermost enclosing namespace scope, the block 2251 // scope declaration declares that same entity and receives the 2252 // linkage of the previous declaration. 2253 DeclContext *OuterContext = DC->getLookupContext(); 2254 if (!OuterContext->isFunctionOrMethod()) 2255 // This rule only applies to block-scope declarations. 2256 return false; 2257 else { 2258 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 2259 if (PrevOuterContext->isRecord()) 2260 // We found a member function: ignore it. 2261 return false; 2262 else { 2263 // Find the innermost enclosing namespace for the new and 2264 // previous declarations. 2265 while (!OuterContext->isFileContext()) 2266 OuterContext = OuterContext->getParent(); 2267 while (!PrevOuterContext->isFileContext()) 2268 PrevOuterContext = PrevOuterContext->getParent(); 2269 2270 // The previous declaration is in a different namespace, so it 2271 // isn't the same function. 2272 if (OuterContext->getPrimaryContext() != 2273 PrevOuterContext->getPrimaryContext()) 2274 return false; 2275 } 2276 } 2277 } 2278 2279 return true; 2280} 2281 2282static void SetNestedNameSpecifier(DeclaratorDecl *DD, Declarator &D) { 2283 CXXScopeSpec &SS = D.getCXXScopeSpec(); 2284 if (!SS.isSet()) return; 2285 DD->setQualifierInfo(static_cast<NestedNameSpecifier*>(SS.getScopeRep()), 2286 SS.getRange()); 2287} 2288 2289NamedDecl* 2290Sema::ActOnVariableDeclarator(Scope* S, Declarator& D, DeclContext* DC, 2291 QualType R, TypeSourceInfo *TInfo, 2292 LookupResult &Previous, 2293 MultiTemplateParamsArg TemplateParamLists, 2294 bool &Redeclaration) { 2295 DeclarationName Name = GetNameForDeclarator(D); 2296 2297 // Check that there are no default arguments (C++ only). 2298 if (getLangOptions().CPlusPlus) 2299 CheckExtraCXXDefaultArguments(D); 2300 2301 VarDecl *NewVD; 2302 VarDecl::StorageClass SC; 2303 switch (D.getDeclSpec().getStorageClassSpec()) { 2304 default: assert(0 && "Unknown storage class!"); 2305 case DeclSpec::SCS_unspecified: SC = VarDecl::None; break; 2306 case DeclSpec::SCS_extern: SC = VarDecl::Extern; break; 2307 case DeclSpec::SCS_static: SC = VarDecl::Static; break; 2308 case DeclSpec::SCS_auto: SC = VarDecl::Auto; break; 2309 case DeclSpec::SCS_register: SC = VarDecl::Register; break; 2310 case DeclSpec::SCS_private_extern: SC = VarDecl::PrivateExtern; break; 2311 case DeclSpec::SCS_mutable: 2312 // mutable can only appear on non-static class members, so it's always 2313 // an error here 2314 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 2315 D.setInvalidType(); 2316 SC = VarDecl::None; 2317 break; 2318 } 2319 2320 IdentifierInfo *II = Name.getAsIdentifierInfo(); 2321 if (!II) { 2322 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 2323 << Name.getAsString(); 2324 return 0; 2325 } 2326 2327 DiagnoseFunctionSpecifiers(D); 2328 2329 if (!DC->isRecord() && S->getFnParent() == 0) { 2330 // C99 6.9p2: The storage-class specifiers auto and register shall not 2331 // appear in the declaration specifiers in an external declaration. 2332 if (SC == VarDecl::Auto || SC == VarDecl::Register) { 2333 2334 // If this is a register variable with an asm label specified, then this 2335 // is a GNU extension. 2336 if (SC == VarDecl::Register && D.getAsmLabel()) 2337 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register); 2338 else 2339 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 2340 D.setInvalidType(); 2341 } 2342 } 2343 if (DC->isRecord() && !CurContext->isRecord()) { 2344 // This is an out-of-line definition of a static data member. 2345 if (SC == VarDecl::Static) { 2346 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2347 diag::err_static_out_of_line) 2348 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 2349 } else if (SC == VarDecl::None) 2350 SC = VarDecl::Static; 2351 } 2352 if (SC == VarDecl::Static) { 2353 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) { 2354 if (RD->isLocalClass()) 2355 Diag(D.getIdentifierLoc(), 2356 diag::err_static_data_member_not_allowed_in_local_class) 2357 << Name << RD->getDeclName(); 2358 } 2359 } 2360 2361 // Match up the template parameter lists with the scope specifier, then 2362 // determine whether we have a template or a template specialization. 2363 bool isExplicitSpecialization = false; 2364 if (TemplateParameterList *TemplateParams 2365 = MatchTemplateParametersToScopeSpecifier( 2366 D.getDeclSpec().getSourceRange().getBegin(), 2367 D.getCXXScopeSpec(), 2368 (TemplateParameterList**)TemplateParamLists.get(), 2369 TemplateParamLists.size(), 2370 isExplicitSpecialization)) { 2371 if (TemplateParams->size() > 0) { 2372 // There is no such thing as a variable template. 2373 Diag(D.getIdentifierLoc(), diag::err_template_variable) 2374 << II 2375 << SourceRange(TemplateParams->getTemplateLoc(), 2376 TemplateParams->getRAngleLoc()); 2377 return 0; 2378 } else { 2379 // There is an extraneous 'template<>' for this variable. Complain 2380 // about it, but allow the declaration of the variable. 2381 Diag(TemplateParams->getTemplateLoc(), 2382 diag::err_template_variable_noparams) 2383 << II 2384 << SourceRange(TemplateParams->getTemplateLoc(), 2385 TemplateParams->getRAngleLoc()); 2386 2387 isExplicitSpecialization = true; 2388 } 2389 } 2390 2391 NewVD = VarDecl::Create(Context, DC, D.getIdentifierLoc(), 2392 II, R, TInfo, SC); 2393 2394 if (D.isInvalidType()) 2395 NewVD->setInvalidDecl(); 2396 2397 SetNestedNameSpecifier(NewVD, D); 2398 2399 if (D.getDeclSpec().isThreadSpecified()) { 2400 if (NewVD->hasLocalStorage()) 2401 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global); 2402 else if (!Context.Target.isTLSSupported()) 2403 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported); 2404 else 2405 NewVD->setThreadSpecified(true); 2406 } 2407 2408 // Set the lexical context. If the declarator has a C++ scope specifier, the 2409 // lexical context will be different from the semantic context. 2410 NewVD->setLexicalDeclContext(CurContext); 2411 2412 // Handle attributes prior to checking for duplicates in MergeVarDecl 2413 ProcessDeclAttributes(S, NewVD, D); 2414 2415 // Handle GNU asm-label extension (encoded as an attribute). 2416 if (Expr *E = (Expr*) D.getAsmLabel()) { 2417 // The parser guarantees this is a string. 2418 StringLiteral *SE = cast<StringLiteral>(E); 2419 NewVD->addAttr(::new (Context) AsmLabelAttr(Context, SE->getString())); 2420 } 2421 2422 // Diagnose shadowed variables before filtering for scope. 2423 if (!D.getCXXScopeSpec().isSet()) 2424 CheckShadow(S, NewVD, Previous); 2425 2426 // Don't consider existing declarations that are in a different 2427 // scope and are out-of-semantic-context declarations (if the new 2428 // declaration has linkage). 2429 FilterLookupForScope(*this, Previous, DC, S, NewVD->hasLinkage()); 2430 2431 // Merge the decl with the existing one if appropriate. 2432 if (!Previous.empty()) { 2433 if (Previous.isSingleResult() && 2434 isa<FieldDecl>(Previous.getFoundDecl()) && 2435 D.getCXXScopeSpec().isSet()) { 2436 // The user tried to define a non-static data member 2437 // out-of-line (C++ [dcl.meaning]p1). 2438 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 2439 << D.getCXXScopeSpec().getRange(); 2440 Previous.clear(); 2441 NewVD->setInvalidDecl(); 2442 } 2443 } else if (D.getCXXScopeSpec().isSet()) { 2444 // No previous declaration in the qualifying scope. 2445 Diag(D.getIdentifierLoc(), diag::err_no_member) 2446 << Name << computeDeclContext(D.getCXXScopeSpec(), true) 2447 << D.getCXXScopeSpec().getRange(); 2448 NewVD->setInvalidDecl(); 2449 } 2450 2451 CheckVariableDeclaration(NewVD, Previous, Redeclaration); 2452 2453 // This is an explicit specialization of a static data member. Check it. 2454 if (isExplicitSpecialization && !NewVD->isInvalidDecl() && 2455 CheckMemberSpecialization(NewVD, Previous)) 2456 NewVD->setInvalidDecl(); 2457 2458 // attributes declared post-definition are currently ignored 2459 if (Previous.isSingleResult()) { 2460 VarDecl *Def = dyn_cast<VarDecl>(Previous.getFoundDecl()); 2461 if (Def && (Def = Def->getDefinition()) && 2462 Def != NewVD && D.hasAttributes()) { 2463 Diag(NewVD->getLocation(), diag::warn_attribute_precede_definition); 2464 Diag(Def->getLocation(), diag::note_previous_definition); 2465 } 2466 } 2467 2468 // If this is a locally-scoped extern C variable, update the map of 2469 // such variables. 2470 if (CurContext->isFunctionOrMethod() && NewVD->isExternC() && 2471 !NewVD->isInvalidDecl()) 2472 RegisterLocallyScopedExternCDecl(NewVD, Previous, S); 2473 2474 return NewVD; 2475} 2476 2477/// \brief Diagnose variable or built-in function shadowing. Implements 2478/// -Wshadow. 2479/// 2480/// This method is called whenever a VarDecl is added to a "useful" 2481/// scope. 2482/// 2483/// \param S the scope in which the shadowing name is being declared 2484/// \param R the lookup of the name 2485/// 2486void Sema::CheckShadow(Scope *S, VarDecl *D, const LookupResult& R) { 2487 // Return if warning is ignored. 2488 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow) == Diagnostic::Ignored) 2489 return; 2490 2491 // Don't diagnose declarations at file scope. The scope might not 2492 // have a DeclContext if (e.g.) we're parsing a function prototype. 2493 DeclContext *NewDC = static_cast<DeclContext*>(S->getEntity()); 2494 if (NewDC && NewDC->isFileContext()) 2495 return; 2496 2497 // Only diagnose if we're shadowing an unambiguous field or variable. 2498 if (R.getResultKind() != LookupResult::Found) 2499 return; 2500 2501 NamedDecl* ShadowedDecl = R.getFoundDecl(); 2502 if (!isa<VarDecl>(ShadowedDecl) && !isa<FieldDecl>(ShadowedDecl)) 2503 return; 2504 2505 DeclContext *OldDC = ShadowedDecl->getDeclContext(); 2506 2507 // Only warn about certain kinds of shadowing for class members. 2508 if (NewDC && NewDC->isRecord()) { 2509 // In particular, don't warn about shadowing non-class members. 2510 if (!OldDC->isRecord()) 2511 return; 2512 2513 // TODO: should we warn about static data members shadowing 2514 // static data members from base classes? 2515 2516 // TODO: don't diagnose for inaccessible shadowed members. 2517 // This is hard to do perfectly because we might friend the 2518 // shadowing context, but that's just a false negative. 2519 } 2520 2521 // Determine what kind of declaration we're shadowing. 2522 unsigned Kind; 2523 if (isa<RecordDecl>(OldDC)) { 2524 if (isa<FieldDecl>(ShadowedDecl)) 2525 Kind = 3; // field 2526 else 2527 Kind = 2; // static data member 2528 } else if (OldDC->isFileContext()) 2529 Kind = 1; // global 2530 else 2531 Kind = 0; // local 2532 2533 DeclarationName Name = R.getLookupName(); 2534 2535 // Emit warning and note. 2536 Diag(R.getNameLoc(), diag::warn_decl_shadow) << Name << Kind << OldDC; 2537 Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration); 2538} 2539 2540/// \brief Check -Wshadow without the advantage of a previous lookup. 2541void Sema::CheckShadow(Scope *S, VarDecl *D) { 2542 LookupResult R(*this, D->getDeclName(), D->getLocation(), 2543 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 2544 LookupName(R, S); 2545 CheckShadow(S, D, R); 2546} 2547 2548/// \brief Perform semantic checking on a newly-created variable 2549/// declaration. 2550/// 2551/// This routine performs all of the type-checking required for a 2552/// variable declaration once it has been built. It is used both to 2553/// check variables after they have been parsed and their declarators 2554/// have been translated into a declaration, and to check variables 2555/// that have been instantiated from a template. 2556/// 2557/// Sets NewVD->isInvalidDecl() if an error was encountered. 2558void Sema::CheckVariableDeclaration(VarDecl *NewVD, 2559 LookupResult &Previous, 2560 bool &Redeclaration) { 2561 // If the decl is already known invalid, don't check it. 2562 if (NewVD->isInvalidDecl()) 2563 return; 2564 2565 QualType T = NewVD->getType(); 2566 2567 if (T->isObjCInterfaceType()) { 2568 Diag(NewVD->getLocation(), diag::err_statically_allocated_object); 2569 return NewVD->setInvalidDecl(); 2570 } 2571 2572 // Emit an error if an address space was applied to decl with local storage. 2573 // This includes arrays of objects with address space qualifiers, but not 2574 // automatic variables that point to other address spaces. 2575 // ISO/IEC TR 18037 S5.1.2 2576 if (NewVD->hasLocalStorage() && (T.getAddressSpace() != 0)) { 2577 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 2578 return NewVD->setInvalidDecl(); 2579 } 2580 2581 if (NewVD->hasLocalStorage() && T.isObjCGCWeak() 2582 && !NewVD->hasAttr<BlocksAttr>()) 2583 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 2584 2585 bool isVM = T->isVariablyModifiedType(); 2586 if (isVM || NewVD->hasAttr<CleanupAttr>() || 2587 NewVD->hasAttr<BlocksAttr>() || 2588 // FIXME: We need to diagnose jumps passed initialized variables in C++. 2589 // However, this turns on the scope checker for everything with a variable 2590 // which may impact compile time. See if we can find a better solution 2591 // to this, perhaps only checking functions that contain gotos in C++? 2592 (LangOpts.CPlusPlus && NewVD->hasLocalStorage())) 2593 FunctionNeedsScopeChecking() = true; 2594 2595 if ((isVM && NewVD->hasLinkage()) || 2596 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { 2597 bool SizeIsNegative; 2598 QualType FixedTy = 2599 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative); 2600 2601 if (FixedTy.isNull() && T->isVariableArrayType()) { 2602 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 2603 // FIXME: This won't give the correct result for 2604 // int a[10][n]; 2605 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 2606 2607 if (NewVD->isFileVarDecl()) 2608 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 2609 << SizeRange; 2610 else if (NewVD->getStorageClass() == VarDecl::Static) 2611 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 2612 << SizeRange; 2613 else 2614 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 2615 << SizeRange; 2616 return NewVD->setInvalidDecl(); 2617 } 2618 2619 if (FixedTy.isNull()) { 2620 if (NewVD->isFileVarDecl()) 2621 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 2622 else 2623 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 2624 return NewVD->setInvalidDecl(); 2625 } 2626 2627 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 2628 NewVD->setType(FixedTy); 2629 } 2630 2631 if (Previous.empty() && NewVD->isExternC()) { 2632 // Since we did not find anything by this name and we're declaring 2633 // an extern "C" variable, look for a non-visible extern "C" 2634 // declaration with the same name. 2635 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 2636 = LocallyScopedExternalDecls.find(NewVD->getDeclName()); 2637 if (Pos != LocallyScopedExternalDecls.end()) 2638 Previous.addDecl(Pos->second); 2639 } 2640 2641 if (T->isVoidType() && !NewVD->hasExternalStorage()) { 2642 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 2643 << T; 2644 return NewVD->setInvalidDecl(); 2645 } 2646 2647 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { 2648 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); 2649 return NewVD->setInvalidDecl(); 2650 } 2651 2652 if (isVM && NewVD->hasAttr<BlocksAttr>()) { 2653 Diag(NewVD->getLocation(), diag::err_block_on_vm); 2654 return NewVD->setInvalidDecl(); 2655 } 2656 2657 if (!Previous.empty()) { 2658 Redeclaration = true; 2659 MergeVarDecl(NewVD, Previous); 2660 } 2661} 2662 2663/// \brief Data used with FindOverriddenMethod 2664struct FindOverriddenMethodData { 2665 Sema *S; 2666 CXXMethodDecl *Method; 2667}; 2668 2669/// \brief Member lookup function that determines whether a given C++ 2670/// method overrides a method in a base class, to be used with 2671/// CXXRecordDecl::lookupInBases(). 2672static bool FindOverriddenMethod(const CXXBaseSpecifier *Specifier, 2673 CXXBasePath &Path, 2674 void *UserData) { 2675 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 2676 2677 FindOverriddenMethodData *Data 2678 = reinterpret_cast<FindOverriddenMethodData*>(UserData); 2679 2680 DeclarationName Name = Data->Method->getDeclName(); 2681 2682 // FIXME: Do we care about other names here too? 2683 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 2684 // We really want to find the base class constructor here. 2685 QualType T = Data->S->Context.getTypeDeclType(BaseRecord); 2686 CanQualType CT = Data->S->Context.getCanonicalType(T); 2687 2688 Name = Data->S->Context.DeclarationNames.getCXXDestructorName(CT); 2689 } 2690 2691 for (Path.Decls = BaseRecord->lookup(Name); 2692 Path.Decls.first != Path.Decls.second; 2693 ++Path.Decls.first) { 2694 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(*Path.Decls.first)) { 2695 if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD)) 2696 return true; 2697 } 2698 } 2699 2700 return false; 2701} 2702 2703/// AddOverriddenMethods - See if a method overrides any in the base classes, 2704/// and if so, check that it's a valid override and remember it. 2705void Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 2706 // Look for virtual methods in base classes that this method might override. 2707 CXXBasePaths Paths; 2708 FindOverriddenMethodData Data; 2709 Data.Method = MD; 2710 Data.S = this; 2711 if (DC->lookupInBases(&FindOverriddenMethod, &Data, Paths)) { 2712 for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(), 2713 E = Paths.found_decls_end(); I != E; ++I) { 2714 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) { 2715 if (!CheckOverridingFunctionReturnType(MD, OldMD) && 2716 !CheckOverridingFunctionExceptionSpec(MD, OldMD) && 2717 !CheckOverridingFunctionAttributes(MD, OldMD)) 2718 MD->addOverriddenMethod(OldMD->getCanonicalDecl()); 2719 } 2720 } 2721 } 2722} 2723 2724NamedDecl* 2725Sema::ActOnFunctionDeclarator(Scope* S, Declarator& D, DeclContext* DC, 2726 QualType R, TypeSourceInfo *TInfo, 2727 LookupResult &Previous, 2728 MultiTemplateParamsArg TemplateParamLists, 2729 bool IsFunctionDefinition, bool &Redeclaration) { 2730 assert(R.getTypePtr()->isFunctionType()); 2731 2732 DeclarationName Name = GetNameForDeclarator(D); 2733 FunctionDecl::StorageClass SC = FunctionDecl::None; 2734 switch (D.getDeclSpec().getStorageClassSpec()) { 2735 default: assert(0 && "Unknown storage class!"); 2736 case DeclSpec::SCS_auto: 2737 case DeclSpec::SCS_register: 2738 case DeclSpec::SCS_mutable: 2739 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2740 diag::err_typecheck_sclass_func); 2741 D.setInvalidType(); 2742 break; 2743 case DeclSpec::SCS_unspecified: SC = FunctionDecl::None; break; 2744 case DeclSpec::SCS_extern: SC = FunctionDecl::Extern; break; 2745 case DeclSpec::SCS_static: { 2746 if (CurContext->getLookupContext()->isFunctionOrMethod()) { 2747 // C99 6.7.1p5: 2748 // The declaration of an identifier for a function that has 2749 // block scope shall have no explicit storage-class specifier 2750 // other than extern 2751 // See also (C++ [dcl.stc]p4). 2752 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2753 diag::err_static_block_func); 2754 SC = FunctionDecl::None; 2755 } else 2756 SC = FunctionDecl::Static; 2757 break; 2758 } 2759 case DeclSpec::SCS_private_extern: SC = FunctionDecl::PrivateExtern;break; 2760 } 2761 2762 if (D.getDeclSpec().isThreadSpecified()) 2763 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 2764 2765 bool isFriend = D.getDeclSpec().isFriendSpecified(); 2766 bool isInline = D.getDeclSpec().isInlineSpecified(); 2767 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 2768 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 2769 2770 // Check that the return type is not an abstract class type. 2771 // For record types, this is done by the AbstractClassUsageDiagnoser once 2772 // the class has been completely parsed. 2773 if (!DC->isRecord() && 2774 RequireNonAbstractType(D.getIdentifierLoc(), 2775 R->getAs<FunctionType>()->getResultType(), 2776 diag::err_abstract_type_in_decl, 2777 AbstractReturnType)) 2778 D.setInvalidType(); 2779 2780 // Do not allow returning a objc interface by-value. 2781 if (R->getAs<FunctionType>()->getResultType()->isObjCInterfaceType()) { 2782 Diag(D.getIdentifierLoc(), 2783 diag::err_object_cannot_be_passed_returned_by_value) << 0 2784 << R->getAs<FunctionType>()->getResultType(); 2785 D.setInvalidType(); 2786 } 2787 2788 bool isVirtualOkay = false; 2789 FunctionDecl *NewFD; 2790 2791 if (isFriend) { 2792 // C++ [class.friend]p5 2793 // A function can be defined in a friend declaration of a 2794 // class . . . . Such a function is implicitly inline. 2795 isInline |= IsFunctionDefinition; 2796 } 2797 2798 if (Name.getNameKind() == DeclarationName::CXXConstructorName) { 2799 // This is a C++ constructor declaration. 2800 assert(DC->isRecord() && 2801 "Constructors can only be declared in a member context"); 2802 2803 R = CheckConstructorDeclarator(D, R, SC); 2804 2805 // Create the new declaration 2806 NewFD = CXXConstructorDecl::Create(Context, 2807 cast<CXXRecordDecl>(DC), 2808 D.getIdentifierLoc(), Name, R, TInfo, 2809 isExplicit, isInline, 2810 /*isImplicitlyDeclared=*/false); 2811 } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 2812 // This is a C++ destructor declaration. 2813 if (DC->isRecord()) { 2814 R = CheckDestructorDeclarator(D, SC); 2815 2816 NewFD = CXXDestructorDecl::Create(Context, 2817 cast<CXXRecordDecl>(DC), 2818 D.getIdentifierLoc(), Name, R, 2819 isInline, 2820 /*isImplicitlyDeclared=*/false); 2821 NewFD->setTypeSourceInfo(TInfo); 2822 2823 isVirtualOkay = true; 2824 } else { 2825 Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 2826 2827 // Create a FunctionDecl to satisfy the function definition parsing 2828 // code path. 2829 NewFD = FunctionDecl::Create(Context, DC, D.getIdentifierLoc(), 2830 Name, R, TInfo, SC, isInline, 2831 /*hasPrototype=*/true); 2832 D.setInvalidType(); 2833 } 2834 } else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) { 2835 if (!DC->isRecord()) { 2836 Diag(D.getIdentifierLoc(), 2837 diag::err_conv_function_not_member); 2838 return 0; 2839 } 2840 2841 CheckConversionDeclarator(D, R, SC); 2842 NewFD = CXXConversionDecl::Create(Context, cast<CXXRecordDecl>(DC), 2843 D.getIdentifierLoc(), Name, R, TInfo, 2844 isInline, isExplicit); 2845 2846 isVirtualOkay = true; 2847 } else if (DC->isRecord()) { 2848 // If the of the function is the same as the name of the record, then this 2849 // must be an invalid constructor that has a return type. 2850 // (The parser checks for a return type and makes the declarator a 2851 // constructor if it has no return type). 2852 // must have an invalid constructor that has a return type 2853 if (Name.getAsIdentifierInfo() && 2854 Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ 2855 Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 2856 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 2857 << SourceRange(D.getIdentifierLoc()); 2858 return 0; 2859 } 2860 2861 bool isStatic = SC == FunctionDecl::Static; 2862 2863 // [class.free]p1: 2864 // Any allocation function for a class T is a static member 2865 // (even if not explicitly declared static). 2866 if (Name.getCXXOverloadedOperator() == OO_New || 2867 Name.getCXXOverloadedOperator() == OO_Array_New) 2868 isStatic = true; 2869 2870 // [class.free]p6 Any deallocation function for a class X is a static member 2871 // (even if not explicitly declared static). 2872 if (Name.getCXXOverloadedOperator() == OO_Delete || 2873 Name.getCXXOverloadedOperator() == OO_Array_Delete) 2874 isStatic = true; 2875 2876 // This is a C++ method declaration. 2877 NewFD = CXXMethodDecl::Create(Context, cast<CXXRecordDecl>(DC), 2878 D.getIdentifierLoc(), Name, R, TInfo, 2879 isStatic, isInline); 2880 2881 isVirtualOkay = !isStatic; 2882 } else { 2883 // Determine whether the function was written with a 2884 // prototype. This true when: 2885 // - we're in C++ (where every function has a prototype), 2886 // - there is a prototype in the declarator, or 2887 // - the type R of the function is some kind of typedef or other reference 2888 // to a type name (which eventually refers to a function type). 2889 bool HasPrototype = 2890 getLangOptions().CPlusPlus || 2891 (D.getNumTypeObjects() && D.getTypeObject(0).Fun.hasPrototype) || 2892 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 2893 2894 NewFD = FunctionDecl::Create(Context, DC, 2895 D.getIdentifierLoc(), 2896 Name, R, TInfo, SC, isInline, HasPrototype); 2897 } 2898 2899 if (D.isInvalidType()) 2900 NewFD->setInvalidDecl(); 2901 2902 SetNestedNameSpecifier(NewFD, D); 2903 2904 // Set the lexical context. If the declarator has a C++ 2905 // scope specifier, or is the object of a friend declaration, the 2906 // lexical context will be different from the semantic context. 2907 NewFD->setLexicalDeclContext(CurContext); 2908 2909 // Match up the template parameter lists with the scope specifier, then 2910 // determine whether we have a template or a template specialization. 2911 FunctionTemplateDecl *FunctionTemplate = 0; 2912 bool isExplicitSpecialization = false; 2913 bool isFunctionTemplateSpecialization = false; 2914 if (TemplateParameterList *TemplateParams 2915 = MatchTemplateParametersToScopeSpecifier( 2916 D.getDeclSpec().getSourceRange().getBegin(), 2917 D.getCXXScopeSpec(), 2918 (TemplateParameterList**)TemplateParamLists.get(), 2919 TemplateParamLists.size(), 2920 isExplicitSpecialization)) { 2921 if (TemplateParams->size() > 0) { 2922 // This is a function template 2923 2924 // Check that we can declare a template here. 2925 if (CheckTemplateDeclScope(S, TemplateParams)) 2926 return 0; 2927 2928 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC, 2929 NewFD->getLocation(), 2930 Name, TemplateParams, 2931 NewFD); 2932 FunctionTemplate->setLexicalDeclContext(CurContext); 2933 NewFD->setDescribedFunctionTemplate(FunctionTemplate); 2934 } else { 2935 // This is a function template specialization. 2936 isFunctionTemplateSpecialization = true; 2937 2938 // C++0x [temp.expl.spec]p20 forbids "template<> friend void foo(int);". 2939 if (isFriend && isFunctionTemplateSpecialization) { 2940 // We want to remove the "template<>", found here. 2941 SourceRange RemoveRange = TemplateParams->getSourceRange(); 2942 2943 // If we remove the template<> and the name is not a 2944 // template-id, we're actually silently creating a problem: 2945 // the friend declaration will refer to an untemplated decl, 2946 // and clearly the user wants a template specialization. So 2947 // we need to insert '<>' after the name. 2948 SourceLocation InsertLoc; 2949 if (D.getName().getKind() != UnqualifiedId::IK_TemplateId) { 2950 InsertLoc = D.getName().getSourceRange().getEnd(); 2951 InsertLoc = PP.getLocForEndOfToken(InsertLoc); 2952 } 2953 2954 Diag(D.getIdentifierLoc(), diag::err_template_spec_decl_friend) 2955 << Name << RemoveRange 2956 << FixItHint::CreateRemoval(RemoveRange) 2957 << FixItHint::CreateInsertion(InsertLoc, "<>"); 2958 } 2959 } 2960 2961 // FIXME: Free this memory properly. 2962 TemplateParamLists.release(); 2963 } 2964 2965 // C++ [dcl.fct.spec]p5: 2966 // The virtual specifier shall only be used in declarations of 2967 // nonstatic class member functions that appear within a 2968 // member-specification of a class declaration; see 10.3. 2969 // 2970 if (isVirtual && !NewFD->isInvalidDecl()) { 2971 if (!isVirtualOkay) { 2972 Diag(D.getDeclSpec().getVirtualSpecLoc(), 2973 diag::err_virtual_non_function); 2974 } else if (!CurContext->isRecord()) { 2975 // 'virtual' was specified outside of the class. 2976 Diag(D.getDeclSpec().getVirtualSpecLoc(), diag::err_virtual_out_of_class) 2977 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 2978 } else { 2979 // Okay: Add virtual to the method. 2980 CXXRecordDecl *CurClass = cast<CXXRecordDecl>(DC); 2981 CurClass->setMethodAsVirtual(NewFD); 2982 } 2983 } 2984 2985 // C++ [dcl.fct.spec]p6: 2986 // The explicit specifier shall be used only in the declaration of a 2987 // constructor or conversion function within its class definition; see 12.3.1 2988 // and 12.3.2. 2989 if (isExplicit && !NewFD->isInvalidDecl()) { 2990 if (!CurContext->isRecord()) { 2991 // 'explicit' was specified outside of the class. 2992 Diag(D.getDeclSpec().getExplicitSpecLoc(), 2993 diag::err_explicit_out_of_class) 2994 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 2995 } else if (!isa<CXXConstructorDecl>(NewFD) && 2996 !isa<CXXConversionDecl>(NewFD)) { 2997 // 'explicit' was specified on a function that wasn't a constructor 2998 // or conversion function. 2999 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3000 diag::err_explicit_non_ctor_or_conv_function) 3001 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 3002 } 3003 } 3004 3005 // Filter out previous declarations that don't match the scope. 3006 FilterLookupForScope(*this, Previous, DC, S, NewFD->hasLinkage()); 3007 3008 if (isFriend) { 3009 // DC is the namespace in which the function is being declared. 3010 assert((DC->isFileContext() || !Previous.empty()) && 3011 "previously-undeclared friend function being created " 3012 "in a non-namespace context"); 3013 3014 // For now, claim that the objects have no previous declaration. 3015 if (FunctionTemplate) { 3016 FunctionTemplate->setObjectOfFriendDecl(false); 3017 FunctionTemplate->setAccess(AS_public); 3018 } else { 3019 NewFD->setObjectOfFriendDecl(false); 3020 } 3021 3022 NewFD->setAccess(AS_public); 3023 } 3024 3025 if (SC == FunctionDecl::Static && isa<CXXMethodDecl>(NewFD) && 3026 !CurContext->isRecord()) { 3027 // C++ [class.static]p1: 3028 // A data or function member of a class may be declared static 3029 // in a class definition, in which case it is a static member of 3030 // the class. 3031 3032 // Complain about the 'static' specifier if it's on an out-of-line 3033 // member function definition. 3034 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 3035 diag::err_static_out_of_line) 3036 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3037 } 3038 3039 // Handle GNU asm-label extension (encoded as an attribute). 3040 if (Expr *E = (Expr*) D.getAsmLabel()) { 3041 // The parser guarantees this is a string. 3042 StringLiteral *SE = cast<StringLiteral>(E); 3043 NewFD->addAttr(::new (Context) AsmLabelAttr(Context, SE->getString())); 3044 } 3045 3046 // Copy the parameter declarations from the declarator D to the function 3047 // declaration NewFD, if they are available. First scavenge them into Params. 3048 llvm::SmallVector<ParmVarDecl*, 16> Params; 3049 if (D.getNumTypeObjects() > 0) { 3050 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 3051 3052 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 3053 // function that takes no arguments, not a function that takes a 3054 // single void argument. 3055 // We let through "const void" here because Sema::GetTypeForDeclarator 3056 // already checks for that case. 3057 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 3058 FTI.ArgInfo[0].Param && 3059 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()) { 3060 // Empty arg list, don't push any params. 3061 ParmVarDecl *Param = FTI.ArgInfo[0].Param.getAs<ParmVarDecl>(); 3062 3063 // In C++, the empty parameter-type-list must be spelled "void"; a 3064 // typedef of void is not permitted. 3065 if (getLangOptions().CPlusPlus && 3066 Param->getType().getUnqualifiedType() != Context.VoidTy) 3067 Diag(Param->getLocation(), diag::err_param_typedef_of_void); 3068 // FIXME: Leaks decl? 3069 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 3070 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 3071 ParmVarDecl *Param = FTI.ArgInfo[i].Param.getAs<ParmVarDecl>(); 3072 assert(Param->getDeclContext() != NewFD && "Was set before ?"); 3073 Param->setDeclContext(NewFD); 3074 Params.push_back(Param); 3075 } 3076 } 3077 3078 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) { 3079 // When we're declaring a function with a typedef, typeof, etc as in the 3080 // following example, we'll need to synthesize (unnamed) 3081 // parameters for use in the declaration. 3082 // 3083 // @code 3084 // typedef void fn(int); 3085 // fn f; 3086 // @endcode 3087 3088 // Synthesize a parameter for each argument type. 3089 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 3090 AE = FT->arg_type_end(); AI != AE; ++AI) { 3091 ParmVarDecl *Param = ParmVarDecl::Create(Context, NewFD, 3092 SourceLocation(), 0, 3093 *AI, /*TInfo=*/0, 3094 VarDecl::None, 0); 3095 Param->setImplicit(); 3096 Params.push_back(Param); 3097 } 3098 } else { 3099 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && 3100 "Should not need args for typedef of non-prototype fn"); 3101 } 3102 // Finally, we know we have the right number of parameters, install them. 3103 NewFD->setParams(Params.data(), Params.size()); 3104 3105 // If the declarator is a template-id, translate the parser's template 3106 // argument list into our AST format. 3107 bool HasExplicitTemplateArgs = false; 3108 TemplateArgumentListInfo TemplateArgs; 3109 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) { 3110 TemplateIdAnnotation *TemplateId = D.getName().TemplateId; 3111 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc); 3112 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc); 3113 ASTTemplateArgsPtr TemplateArgsPtr(*this, 3114 TemplateId->getTemplateArgs(), 3115 TemplateId->NumArgs); 3116 translateTemplateArguments(TemplateArgsPtr, 3117 TemplateArgs); 3118 TemplateArgsPtr.release(); 3119 3120 HasExplicitTemplateArgs = true; 3121 3122 if (FunctionTemplate) { 3123 // FIXME: Diagnose function template with explicit template 3124 // arguments. 3125 HasExplicitTemplateArgs = false; 3126 } else if (!isFunctionTemplateSpecialization && 3127 !D.getDeclSpec().isFriendSpecified()) { 3128 // We have encountered something that the user meant to be a 3129 // specialization (because it has explicitly-specified template 3130 // arguments) but that was not introduced with a "template<>" (or had 3131 // too few of them). 3132 Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header) 3133 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc) 3134 << FixItHint::CreateInsertion( 3135 D.getDeclSpec().getSourceRange().getBegin(), 3136 "template<> "); 3137 isFunctionTemplateSpecialization = true; 3138 } else { 3139 // "friend void foo<>(int);" is an implicit specialization decl. 3140 isFunctionTemplateSpecialization = true; 3141 } 3142 } else if (isFriend && isFunctionTemplateSpecialization) { 3143 // This combination is only possible in a recovery case; the user 3144 // wrote something like: 3145 // template <> friend void foo(int); 3146 // which we're recovering from as if the user had written: 3147 // friend void foo<>(int); 3148 // Go ahead and fake up a template id. 3149 HasExplicitTemplateArgs = true; 3150 TemplateArgs.setLAngleLoc(D.getIdentifierLoc()); 3151 TemplateArgs.setRAngleLoc(D.getIdentifierLoc()); 3152 } 3153 3154 // If it's a friend (and only if it's a friend), it's possible 3155 // that either the specialized function type or the specialized 3156 // template is dependent, and therefore matching will fail. In 3157 // this case, don't check the specialization yet. 3158 if (isFunctionTemplateSpecialization && isFriend && 3159 (NewFD->getType()->isDependentType() || DC->isDependentContext())) { 3160 assert(HasExplicitTemplateArgs && 3161 "friend function specialization without template args"); 3162 if (CheckDependentFunctionTemplateSpecialization(NewFD, TemplateArgs, 3163 Previous)) 3164 NewFD->setInvalidDecl(); 3165 } else if (isFunctionTemplateSpecialization) { 3166 if (CheckFunctionTemplateSpecialization(NewFD, 3167 (HasExplicitTemplateArgs ? &TemplateArgs : 0), 3168 Previous)) 3169 NewFD->setInvalidDecl(); 3170 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD)) { 3171 if (CheckMemberSpecialization(NewFD, Previous)) 3172 NewFD->setInvalidDecl(); 3173 } 3174 3175 // Perform semantic checking on the function declaration. 3176 bool OverloadableAttrRequired = false; // FIXME: HACK! 3177 CheckFunctionDeclaration(S, NewFD, Previous, isExplicitSpecialization, 3178 Redeclaration, /*FIXME:*/OverloadableAttrRequired); 3179 3180 assert((NewFD->isInvalidDecl() || !Redeclaration || 3181 Previous.getResultKind() != LookupResult::FoundOverloaded) && 3182 "previous declaration set still overloaded"); 3183 3184 if (isFriend && Redeclaration) { 3185 AccessSpecifier Access = NewFD->getPreviousDeclaration()->getAccess(); 3186 if (FunctionTemplate) { 3187 FunctionTemplate->setObjectOfFriendDecl(true); 3188 FunctionTemplate->setAccess(Access); 3189 } else { 3190 NewFD->setObjectOfFriendDecl(true); 3191 } 3192 NewFD->setAccess(Access); 3193 } 3194 3195 // If we have a function template, check the template parameter 3196 // list. This will check and merge default template arguments. 3197 if (FunctionTemplate) { 3198 FunctionTemplateDecl *PrevTemplate = FunctionTemplate->getPreviousDeclaration(); 3199 CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(), 3200 PrevTemplate? PrevTemplate->getTemplateParameters() : 0, 3201 D.getDeclSpec().isFriendSpecified()? TPC_FriendFunctionTemplate 3202 : TPC_FunctionTemplate); 3203 } 3204 3205 if (D.getCXXScopeSpec().isSet() && !NewFD->isInvalidDecl()) { 3206 // Fake up an access specifier if it's supposed to be a class member. 3207 if (!Redeclaration && isa<CXXRecordDecl>(NewFD->getDeclContext())) 3208 NewFD->setAccess(AS_public); 3209 3210 // An out-of-line member function declaration must also be a 3211 // definition (C++ [dcl.meaning]p1). 3212 // Note that this is not the case for explicit specializations of 3213 // function templates or member functions of class templates, per 3214 // C++ [temp.expl.spec]p2. 3215 if (!IsFunctionDefinition && !isFriend && 3216 !isFunctionTemplateSpecialization && !isExplicitSpecialization) { 3217 Diag(NewFD->getLocation(), diag::err_out_of_line_declaration) 3218 << D.getCXXScopeSpec().getRange(); 3219 NewFD->setInvalidDecl(); 3220 } else if (!Redeclaration && 3221 !(isFriend && CurContext->isDependentContext())) { 3222 // The user tried to provide an out-of-line definition for a 3223 // function that is a member of a class or namespace, but there 3224 // was no such member function declared (C++ [class.mfct]p2, 3225 // C++ [namespace.memdef]p2). For example: 3226 // 3227 // class X { 3228 // void f() const; 3229 // }; 3230 // 3231 // void X::f() { } // ill-formed 3232 // 3233 // Complain about this problem, and attempt to suggest close 3234 // matches (e.g., those that differ only in cv-qualifiers and 3235 // whether the parameter types are references). 3236 Diag(D.getIdentifierLoc(), diag::err_member_def_does_not_match) 3237 << Name << DC << D.getCXXScopeSpec().getRange(); 3238 NewFD->setInvalidDecl(); 3239 3240 LookupResult Prev(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 3241 ForRedeclaration); 3242 LookupQualifiedName(Prev, DC); 3243 assert(!Prev.isAmbiguous() && 3244 "Cannot have an ambiguity in previous-declaration lookup"); 3245 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 3246 Func != FuncEnd; ++Func) { 3247 if (isa<FunctionDecl>(*Func) && 3248 isNearlyMatchingFunction(Context, cast<FunctionDecl>(*Func), NewFD)) 3249 Diag((*Func)->getLocation(), diag::note_member_def_close_match); 3250 } 3251 } 3252 } 3253 3254 // Handle attributes. We need to have merged decls when handling attributes 3255 // (for example to check for conflicts, etc). 3256 // FIXME: This needs to happen before we merge declarations. Then, 3257 // let attribute merging cope with attribute conflicts. 3258 ProcessDeclAttributes(S, NewFD, D); 3259 3260 // attributes declared post-definition are currently ignored 3261 if (Redeclaration && Previous.isSingleResult()) { 3262 const FunctionDecl *Def; 3263 FunctionDecl *PrevFD = dyn_cast<FunctionDecl>(Previous.getFoundDecl()); 3264 if (PrevFD && PrevFD->getBody(Def) && D.hasAttributes()) { 3265 Diag(NewFD->getLocation(), diag::warn_attribute_precede_definition); 3266 Diag(Def->getLocation(), diag::note_previous_definition); 3267 } 3268 } 3269 3270 AddKnownFunctionAttributes(NewFD); 3271 3272 if (OverloadableAttrRequired && !NewFD->getAttr<OverloadableAttr>()) { 3273 // If a function name is overloadable in C, then every function 3274 // with that name must be marked "overloadable". 3275 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 3276 << Redeclaration << NewFD; 3277 if (!Previous.empty()) 3278 Diag(Previous.getRepresentativeDecl()->getLocation(), 3279 diag::note_attribute_overloadable_prev_overload); 3280 NewFD->addAttr(::new (Context) OverloadableAttr()); 3281 } 3282 3283 // If this is a locally-scoped extern C function, update the 3284 // map of such names. 3285 if (CurContext->isFunctionOrMethod() && NewFD->isExternC() 3286 && !NewFD->isInvalidDecl()) 3287 RegisterLocallyScopedExternCDecl(NewFD, Previous, S); 3288 3289 // Set this FunctionDecl's range up to the right paren. 3290 NewFD->setLocEnd(D.getSourceRange().getEnd()); 3291 3292 if (FunctionTemplate && NewFD->isInvalidDecl()) 3293 FunctionTemplate->setInvalidDecl(); 3294 3295 if (FunctionTemplate) 3296 return FunctionTemplate; 3297 3298 3299 // Keep track of static, non-inlined function definitions that 3300 // have not been used. We will warn later. 3301 // FIXME: Also include static functions declared but not defined. 3302 if (!NewFD->isInvalidDecl() && IsFunctionDefinition 3303 && !NewFD->isInlined() && NewFD->getLinkage() == InternalLinkage 3304 && !NewFD->isUsed() && !NewFD->hasAttr<UnusedAttr>()) 3305 UnusedStaticFuncs.push_back(NewFD); 3306 3307 return NewFD; 3308} 3309 3310/// \brief Perform semantic checking of a new function declaration. 3311/// 3312/// Performs semantic analysis of the new function declaration 3313/// NewFD. This routine performs all semantic checking that does not 3314/// require the actual declarator involved in the declaration, and is 3315/// used both for the declaration of functions as they are parsed 3316/// (called via ActOnDeclarator) and for the declaration of functions 3317/// that have been instantiated via C++ template instantiation (called 3318/// via InstantiateDecl). 3319/// 3320/// \param IsExplicitSpecialiation whether this new function declaration is 3321/// an explicit specialization of the previous declaration. 3322/// 3323/// This sets NewFD->isInvalidDecl() to true if there was an error. 3324void Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD, 3325 LookupResult &Previous, 3326 bool IsExplicitSpecialization, 3327 bool &Redeclaration, 3328 bool &OverloadableAttrRequired) { 3329 // If NewFD is already known erroneous, don't do any of this checking. 3330 if (NewFD->isInvalidDecl()) 3331 return; 3332 3333 if (NewFD->getResultType()->isVariablyModifiedType()) { 3334 // Functions returning a variably modified type violate C99 6.7.5.2p2 3335 // because all functions have linkage. 3336 Diag(NewFD->getLocation(), diag::err_vm_func_decl); 3337 return NewFD->setInvalidDecl(); 3338 } 3339 3340 if (NewFD->isMain()) 3341 CheckMain(NewFD); 3342 3343 // Check for a previous declaration of this name. 3344 if (Previous.empty() && NewFD->isExternC()) { 3345 // Since we did not find anything by this name and we're declaring 3346 // an extern "C" function, look for a non-visible extern "C" 3347 // declaration with the same name. 3348 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3349 = LocallyScopedExternalDecls.find(NewFD->getDeclName()); 3350 if (Pos != LocallyScopedExternalDecls.end()) 3351 Previous.addDecl(Pos->second); 3352 } 3353 3354 // Merge or overload the declaration with an existing declaration of 3355 // the same name, if appropriate. 3356 if (!Previous.empty()) { 3357 // Determine whether NewFD is an overload of PrevDecl or 3358 // a declaration that requires merging. If it's an overload, 3359 // there's no more work to do here; we'll just add the new 3360 // function to the scope. 3361 3362 NamedDecl *OldDecl = 0; 3363 if (!AllowOverloadingOfFunction(Previous, Context)) { 3364 Redeclaration = true; 3365 OldDecl = Previous.getFoundDecl(); 3366 } else { 3367 if (!getLangOptions().CPlusPlus) { 3368 OverloadableAttrRequired = true; 3369 3370 // Functions marked "overloadable" must have a prototype (that 3371 // we can't get through declaration merging). 3372 if (!NewFD->getType()->getAs<FunctionProtoType>()) { 3373 Diag(NewFD->getLocation(), 3374 diag::err_attribute_overloadable_no_prototype) 3375 << NewFD; 3376 Redeclaration = true; 3377 3378 // Turn this into a variadic function with no parameters. 3379 QualType R = Context.getFunctionType( 3380 NewFD->getType()->getAs<FunctionType>()->getResultType(), 3381 0, 0, true, 0, false, false, 0, 0, 3382 FunctionType::ExtInfo()); 3383 NewFD->setType(R); 3384 return NewFD->setInvalidDecl(); 3385 } 3386 } 3387 3388 switch (CheckOverload(NewFD, Previous, OldDecl)) { 3389 case Ovl_Match: 3390 Redeclaration = true; 3391 if (isa<UsingShadowDecl>(OldDecl) && CurContext->isRecord()) { 3392 HideUsingShadowDecl(S, cast<UsingShadowDecl>(OldDecl)); 3393 Redeclaration = false; 3394 } 3395 break; 3396 3397 case Ovl_NonFunction: 3398 Redeclaration = true; 3399 break; 3400 3401 case Ovl_Overload: 3402 Redeclaration = false; 3403 break; 3404 } 3405 } 3406 3407 if (Redeclaration) { 3408 // NewFD and OldDecl represent declarations that need to be 3409 // merged. 3410 if (MergeFunctionDecl(NewFD, OldDecl)) 3411 return NewFD->setInvalidDecl(); 3412 3413 Previous.clear(); 3414 Previous.addDecl(OldDecl); 3415 3416 if (FunctionTemplateDecl *OldTemplateDecl 3417 = dyn_cast<FunctionTemplateDecl>(OldDecl)) { 3418 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl()); 3419 FunctionTemplateDecl *NewTemplateDecl 3420 = NewFD->getDescribedFunctionTemplate(); 3421 assert(NewTemplateDecl && "Template/non-template mismatch"); 3422 if (CXXMethodDecl *Method 3423 = dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) { 3424 Method->setAccess(OldTemplateDecl->getAccess()); 3425 NewTemplateDecl->setAccess(OldTemplateDecl->getAccess()); 3426 } 3427 3428 // If this is an explicit specialization of a member that is a function 3429 // template, mark it as a member specialization. 3430 if (IsExplicitSpecialization && 3431 NewTemplateDecl->getInstantiatedFromMemberTemplate()) { 3432 NewTemplateDecl->setMemberSpecialization(); 3433 assert(OldTemplateDecl->isMemberSpecialization()); 3434 } 3435 } else { 3436 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions 3437 NewFD->setAccess(OldDecl->getAccess()); 3438 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 3439 } 3440 } 3441 } 3442 3443 // Semantic checking for this function declaration (in isolation). 3444 if (getLangOptions().CPlusPlus) { 3445 // C++-specific checks. 3446 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { 3447 CheckConstructor(Constructor); 3448 } else if (CXXDestructorDecl *Destructor = 3449 dyn_cast<CXXDestructorDecl>(NewFD)) { 3450 CXXRecordDecl *Record = Destructor->getParent(); 3451 QualType ClassType = Context.getTypeDeclType(Record); 3452 3453 // FIXME: Shouldn't we be able to perform thisc heck even when the class 3454 // type is dependent? Both gcc and edg can handle that. 3455 if (!ClassType->isDependentType()) { 3456 DeclarationName Name 3457 = Context.DeclarationNames.getCXXDestructorName( 3458 Context.getCanonicalType(ClassType)); 3459 if (NewFD->getDeclName() != Name) { 3460 Diag(NewFD->getLocation(), diag::err_destructor_name); 3461 return NewFD->setInvalidDecl(); 3462 } 3463 } 3464 3465 Record->setUserDeclaredDestructor(true); 3466 // C++ [class]p4: A POD-struct is an aggregate class that has [...] no 3467 // user-defined destructor. 3468 Record->setPOD(false); 3469 3470 // C++ [class.dtor]p3: A destructor is trivial if it is an implicitly- 3471 // declared destructor. 3472 // FIXME: C++0x: don't do this for "= default" destructors 3473 Record->setHasTrivialDestructor(false); 3474 } else if (CXXConversionDecl *Conversion 3475 = dyn_cast<CXXConversionDecl>(NewFD)) { 3476 ActOnConversionDeclarator(Conversion); 3477 } 3478 3479 // Find any virtual functions that this function overrides. 3480 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) { 3481 if (!Method->isFunctionTemplateSpecialization() && 3482 !Method->getDescribedFunctionTemplate()) 3483 AddOverriddenMethods(Method->getParent(), Method); 3484 } 3485 3486 // Additional checks for the destructor; make sure we do this after we 3487 // figure out whether the destructor is virtual. 3488 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(NewFD)) 3489 if (!Destructor->getParent()->isDependentType()) 3490 CheckDestructor(Destructor); 3491 3492 // Extra checking for C++ overloaded operators (C++ [over.oper]). 3493 if (NewFD->isOverloadedOperator() && 3494 CheckOverloadedOperatorDeclaration(NewFD)) 3495 return NewFD->setInvalidDecl(); 3496 3497 // Extra checking for C++0x literal operators (C++0x [over.literal]). 3498 if (NewFD->getLiteralIdentifier() && 3499 CheckLiteralOperatorDeclaration(NewFD)) 3500 return NewFD->setInvalidDecl(); 3501 3502 // In C++, check default arguments now that we have merged decls. Unless 3503 // the lexical context is the class, because in this case this is done 3504 // during delayed parsing anyway. 3505 if (!CurContext->isRecord()) 3506 CheckCXXDefaultArguments(NewFD); 3507 } 3508} 3509 3510void Sema::CheckMain(FunctionDecl* FD) { 3511 // C++ [basic.start.main]p3: A program that declares main to be inline 3512 // or static is ill-formed. 3513 // C99 6.7.4p4: In a hosted environment, the inline function specifier 3514 // shall not appear in a declaration of main. 3515 // static main is not an error under C99, but we should warn about it. 3516 bool isInline = FD->isInlineSpecified(); 3517 bool isStatic = FD->getStorageClass() == FunctionDecl::Static; 3518 if (isInline || isStatic) { 3519 unsigned diagID = diag::warn_unusual_main_decl; 3520 if (isInline || getLangOptions().CPlusPlus) 3521 diagID = diag::err_unusual_main_decl; 3522 3523 int which = isStatic + (isInline << 1) - 1; 3524 Diag(FD->getLocation(), diagID) << which; 3525 } 3526 3527 QualType T = FD->getType(); 3528 assert(T->isFunctionType() && "function decl is not of function type"); 3529 const FunctionType* FT = T->getAs<FunctionType>(); 3530 3531 if (!Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) { 3532 // TODO: add a replacement fixit to turn the return type into 'int'. 3533 Diag(FD->getTypeSpecStartLoc(), diag::err_main_returns_nonint); 3534 FD->setInvalidDecl(true); 3535 } 3536 3537 // Treat protoless main() as nullary. 3538 if (isa<FunctionNoProtoType>(FT)) return; 3539 3540 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT); 3541 unsigned nparams = FTP->getNumArgs(); 3542 assert(FD->getNumParams() == nparams); 3543 3544 bool HasExtraParameters = (nparams > 3); 3545 3546 // Darwin passes an undocumented fourth argument of type char**. If 3547 // other platforms start sprouting these, the logic below will start 3548 // getting shifty. 3549 if (nparams == 4 && 3550 Context.Target.getTriple().getOS() == llvm::Triple::Darwin) 3551 HasExtraParameters = false; 3552 3553 if (HasExtraParameters) { 3554 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams; 3555 FD->setInvalidDecl(true); 3556 nparams = 3; 3557 } 3558 3559 // FIXME: a lot of the following diagnostics would be improved 3560 // if we had some location information about types. 3561 3562 QualType CharPP = 3563 Context.getPointerType(Context.getPointerType(Context.CharTy)); 3564 QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP }; 3565 3566 for (unsigned i = 0; i < nparams; ++i) { 3567 QualType AT = FTP->getArgType(i); 3568 3569 bool mismatch = true; 3570 3571 if (Context.hasSameUnqualifiedType(AT, Expected[i])) 3572 mismatch = false; 3573 else if (Expected[i] == CharPP) { 3574 // As an extension, the following forms are okay: 3575 // char const ** 3576 // char const * const * 3577 // char * const * 3578 3579 QualifierCollector qs; 3580 const PointerType* PT; 3581 if ((PT = qs.strip(AT)->getAs<PointerType>()) && 3582 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) && 3583 (QualType(qs.strip(PT->getPointeeType()), 0) == Context.CharTy)) { 3584 qs.removeConst(); 3585 mismatch = !qs.empty(); 3586 } 3587 } 3588 3589 if (mismatch) { 3590 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i]; 3591 // TODO: suggest replacing given type with expected type 3592 FD->setInvalidDecl(true); 3593 } 3594 } 3595 3596 if (nparams == 1 && !FD->isInvalidDecl()) { 3597 Diag(FD->getLocation(), diag::warn_main_one_arg); 3598 } 3599} 3600 3601bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 3602 // FIXME: Need strict checking. In C89, we need to check for 3603 // any assignment, increment, decrement, function-calls, or 3604 // commas outside of a sizeof. In C99, it's the same list, 3605 // except that the aforementioned are allowed in unevaluated 3606 // expressions. Everything else falls under the 3607 // "may accept other forms of constant expressions" exception. 3608 // (We never end up here for C++, so the constant expression 3609 // rules there don't matter.) 3610 if (Init->isConstantInitializer(Context)) 3611 return false; 3612 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 3613 << Init->getSourceRange(); 3614 return true; 3615} 3616 3617void Sema::AddInitializerToDecl(DeclPtrTy dcl, ExprArg init) { 3618 AddInitializerToDecl(dcl, move(init), /*DirectInit=*/false); 3619} 3620 3621/// AddInitializerToDecl - Adds the initializer Init to the 3622/// declaration dcl. If DirectInit is true, this is C++ direct 3623/// initialization rather than copy initialization. 3624void Sema::AddInitializerToDecl(DeclPtrTy dcl, ExprArg init, bool DirectInit) { 3625 Decl *RealDecl = dcl.getAs<Decl>(); 3626 // If there is no declaration, there was an error parsing it. Just ignore 3627 // the initializer. 3628 if (RealDecl == 0) 3629 return; 3630 3631 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 3632 // With declarators parsed the way they are, the parser cannot 3633 // distinguish between a normal initializer and a pure-specifier. 3634 // Thus this grotesque test. 3635 IntegerLiteral *IL; 3636 Expr *Init = static_cast<Expr *>(init.get()); 3637 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 3638 Context.getCanonicalType(IL->getType()) == Context.IntTy) 3639 CheckPureMethod(Method, Init->getSourceRange()); 3640 else { 3641 Diag(Method->getLocation(), diag::err_member_function_initialization) 3642 << Method->getDeclName() << Init->getSourceRange(); 3643 Method->setInvalidDecl(); 3644 } 3645 return; 3646 } 3647 3648 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 3649 if (!VDecl) { 3650 if (getLangOptions().CPlusPlus && 3651 RealDecl->getLexicalDeclContext()->isRecord() && 3652 isa<NamedDecl>(RealDecl)) 3653 Diag(RealDecl->getLocation(), diag::err_member_initialization) 3654 << cast<NamedDecl>(RealDecl)->getDeclName(); 3655 else 3656 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 3657 RealDecl->setInvalidDecl(); 3658 return; 3659 } 3660 3661 // A definition must end up with a complete type, which means it must be 3662 // complete with the restriction that an array type might be completed by the 3663 // initializer; note that later code assumes this restriction. 3664 QualType BaseDeclType = VDecl->getType(); 3665 if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType)) 3666 BaseDeclType = Array->getElementType(); 3667 if (RequireCompleteType(VDecl->getLocation(), BaseDeclType, 3668 diag::err_typecheck_decl_incomplete_type)) { 3669 RealDecl->setInvalidDecl(); 3670 return; 3671 } 3672 3673 // The variable can not have an abstract class type. 3674 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 3675 diag::err_abstract_type_in_decl, 3676 AbstractVariableType)) 3677 VDecl->setInvalidDecl(); 3678 3679 const VarDecl *Def; 3680 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 3681 Diag(VDecl->getLocation(), diag::err_redefinition) 3682 << VDecl->getDeclName(); 3683 Diag(Def->getLocation(), diag::note_previous_definition); 3684 VDecl->setInvalidDecl(); 3685 return; 3686 } 3687 3688 // Take ownership of the expression, now that we're sure we have somewhere 3689 // to put it. 3690 Expr *Init = init.takeAs<Expr>(); 3691 assert(Init && "missing initializer"); 3692 3693 // Capture the variable that is being initialized and the style of 3694 // initialization. 3695 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 3696 3697 // FIXME: Poor source location information. 3698 InitializationKind Kind 3699 = DirectInit? InitializationKind::CreateDirect(VDecl->getLocation(), 3700 Init->getLocStart(), 3701 Init->getLocEnd()) 3702 : InitializationKind::CreateCopy(VDecl->getLocation(), 3703 Init->getLocStart()); 3704 3705 // Get the decls type and save a reference for later, since 3706 // CheckInitializerTypes may change it. 3707 QualType DclT = VDecl->getType(), SavT = DclT; 3708 if (VDecl->isBlockVarDecl()) { 3709 if (VDecl->hasExternalStorage()) { // C99 6.7.8p5 3710 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 3711 VDecl->setInvalidDecl(); 3712 } else if (!VDecl->isInvalidDecl()) { 3713 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 3714 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 3715 MultiExprArg(*this, (void**)&Init, 1), 3716 &DclT); 3717 if (Result.isInvalid()) { 3718 VDecl->setInvalidDecl(); 3719 return; 3720 } 3721 3722 Init = Result.takeAs<Expr>(); 3723 3724 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 3725 // Don't check invalid declarations to avoid emitting useless diagnostics. 3726 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 3727 if (VDecl->getStorageClass() == VarDecl::Static) // C99 6.7.8p4. 3728 CheckForConstantInitializer(Init, DclT); 3729 } 3730 } 3731 } else if (VDecl->isStaticDataMember() && 3732 VDecl->getLexicalDeclContext()->isRecord()) { 3733 // This is an in-class initialization for a static data member, e.g., 3734 // 3735 // struct S { 3736 // static const int value = 17; 3737 // }; 3738 3739 // Attach the initializer 3740 VDecl->setInit(Init); 3741 3742 // C++ [class.mem]p4: 3743 // A member-declarator can contain a constant-initializer only 3744 // if it declares a static member (9.4) of const integral or 3745 // const enumeration type, see 9.4.2. 3746 QualType T = VDecl->getType(); 3747 if (!T->isDependentType() && 3748 (!Context.getCanonicalType(T).isConstQualified() || 3749 !T->isIntegralType())) { 3750 Diag(VDecl->getLocation(), diag::err_member_initialization) 3751 << VDecl->getDeclName() << Init->getSourceRange(); 3752 VDecl->setInvalidDecl(); 3753 } else { 3754 // C++ [class.static.data]p4: 3755 // If a static data member is of const integral or const 3756 // enumeration type, its declaration in the class definition 3757 // can specify a constant-initializer which shall be an 3758 // integral constant expression (5.19). 3759 if (!Init->isTypeDependent() && 3760 !Init->getType()->isIntegralType()) { 3761 // We have a non-dependent, non-integral or enumeration type. 3762 Diag(Init->getSourceRange().getBegin(), 3763 diag::err_in_class_initializer_non_integral_type) 3764 << Init->getType() << Init->getSourceRange(); 3765 VDecl->setInvalidDecl(); 3766 } else if (!Init->isTypeDependent() && !Init->isValueDependent()) { 3767 // Check whether the expression is a constant expression. 3768 llvm::APSInt Value; 3769 SourceLocation Loc; 3770 if (!Init->isIntegerConstantExpr(Value, Context, &Loc)) { 3771 Diag(Loc, diag::err_in_class_initializer_non_constant) 3772 << Init->getSourceRange(); 3773 VDecl->setInvalidDecl(); 3774 } else if (!VDecl->getType()->isDependentType()) 3775 ImpCastExprToType(Init, VDecl->getType(), CastExpr::CK_IntegralCast); 3776 } 3777 } 3778 } else if (VDecl->isFileVarDecl()) { 3779 if (VDecl->getStorageClass() == VarDecl::Extern) 3780 Diag(VDecl->getLocation(), diag::warn_extern_init); 3781 if (!VDecl->isInvalidDecl()) { 3782 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 3783 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 3784 MultiExprArg(*this, (void**)&Init, 1), 3785 &DclT); 3786 if (Result.isInvalid()) { 3787 VDecl->setInvalidDecl(); 3788 return; 3789 } 3790 3791 Init = Result.takeAs<Expr>(); 3792 } 3793 3794 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 3795 // Don't check invalid declarations to avoid emitting useless diagnostics. 3796 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 3797 // C99 6.7.8p4. All file scoped initializers need to be constant. 3798 CheckForConstantInitializer(Init, DclT); 3799 } 3800 } 3801 // If the type changed, it means we had an incomplete type that was 3802 // completed by the initializer. For example: 3803 // int ary[] = { 1, 3, 5 }; 3804 // "ary" transitions from a VariableArrayType to a ConstantArrayType. 3805 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 3806 VDecl->setType(DclT); 3807 Init->setType(DclT); 3808 } 3809 3810 Init = MaybeCreateCXXExprWithTemporaries(Init); 3811 // Attach the initializer to the decl. 3812 VDecl->setInit(Init); 3813 3814 if (getLangOptions().CPlusPlus) { 3815 // Make sure we mark the destructor as used if necessary. 3816 QualType InitType = VDecl->getType(); 3817 while (const ArrayType *Array = Context.getAsArrayType(InitType)) 3818 InitType = Context.getBaseElementType(Array); 3819 if (const RecordType *Record = InitType->getAs<RecordType>()) 3820 FinalizeVarWithDestructor(VDecl, Record); 3821 } 3822 3823 return; 3824} 3825 3826/// ActOnInitializerError - Given that there was an error parsing an 3827/// initializer for the given declaration, try to return to some form 3828/// of sanity. 3829void Sema::ActOnInitializerError(DeclPtrTy dcl) { 3830 // Our main concern here is re-establishing invariants like "a 3831 // variable's type is either dependent or complete". 3832 Decl *D = dcl.getAs<Decl>(); 3833 if (!D || D->isInvalidDecl()) return; 3834 3835 VarDecl *VD = dyn_cast<VarDecl>(D); 3836 if (!VD) return; 3837 3838 QualType Ty = VD->getType(); 3839 if (Ty->isDependentType()) return; 3840 3841 // Require a complete type. 3842 if (RequireCompleteType(VD->getLocation(), 3843 Context.getBaseElementType(Ty), 3844 diag::err_typecheck_decl_incomplete_type)) { 3845 VD->setInvalidDecl(); 3846 return; 3847 } 3848 3849 // Require an abstract type. 3850 if (RequireNonAbstractType(VD->getLocation(), Ty, 3851 diag::err_abstract_type_in_decl, 3852 AbstractVariableType)) { 3853 VD->setInvalidDecl(); 3854 return; 3855 } 3856 3857 // Don't bother complaining about constructors or destructors, 3858 // though. 3859} 3860 3861void Sema::ActOnUninitializedDecl(DeclPtrTy dcl, 3862 bool TypeContainsUndeducedAuto) { 3863 Decl *RealDecl = dcl.getAs<Decl>(); 3864 3865 // If there is no declaration, there was an error parsing it. Just ignore it. 3866 if (RealDecl == 0) 3867 return; 3868 3869 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 3870 QualType Type = Var->getType(); 3871 3872 // C++0x [dcl.spec.auto]p3 3873 if (TypeContainsUndeducedAuto) { 3874 Diag(Var->getLocation(), diag::err_auto_var_requires_init) 3875 << Var->getDeclName() << Type; 3876 Var->setInvalidDecl(); 3877 return; 3878 } 3879 3880 switch (Var->isThisDeclarationADefinition()) { 3881 case VarDecl::Definition: 3882 if (!Var->isStaticDataMember() || !Var->getAnyInitializer()) 3883 break; 3884 3885 // We have an out-of-line definition of a static data member 3886 // that has an in-class initializer, so we type-check this like 3887 // a declaration. 3888 // 3889 // Fall through 3890 3891 case VarDecl::DeclarationOnly: 3892 // It's only a declaration. 3893 3894 // Block scope. C99 6.7p7: If an identifier for an object is 3895 // declared with no linkage (C99 6.2.2p6), the type for the 3896 // object shall be complete. 3897 if (!Type->isDependentType() && Var->isBlockVarDecl() && 3898 !Var->getLinkage() && !Var->isInvalidDecl() && 3899 RequireCompleteType(Var->getLocation(), Type, 3900 diag::err_typecheck_decl_incomplete_type)) 3901 Var->setInvalidDecl(); 3902 3903 // Make sure that the type is not abstract. 3904 if (!Type->isDependentType() && !Var->isInvalidDecl() && 3905 RequireNonAbstractType(Var->getLocation(), Type, 3906 diag::err_abstract_type_in_decl, 3907 AbstractVariableType)) 3908 Var->setInvalidDecl(); 3909 return; 3910 3911 case VarDecl::TentativeDefinition: 3912 // File scope. C99 6.9.2p2: A declaration of an identifier for an 3913 // object that has file scope without an initializer, and without a 3914 // storage-class specifier or with the storage-class specifier "static", 3915 // constitutes a tentative definition. Note: A tentative definition with 3916 // external linkage is valid (C99 6.2.2p5). 3917 if (!Var->isInvalidDecl()) { 3918 if (const IncompleteArrayType *ArrayT 3919 = Context.getAsIncompleteArrayType(Type)) { 3920 if (RequireCompleteType(Var->getLocation(), 3921 ArrayT->getElementType(), 3922 diag::err_illegal_decl_array_incomplete_type)) 3923 Var->setInvalidDecl(); 3924 } else if (Var->getStorageClass() == VarDecl::Static) { 3925 // C99 6.9.2p3: If the declaration of an identifier for an object is 3926 // a tentative definition and has internal linkage (C99 6.2.2p3), the 3927 // declared type shall not be an incomplete type. 3928 // NOTE: code such as the following 3929 // static struct s; 3930 // struct s { int a; }; 3931 // is accepted by gcc. Hence here we issue a warning instead of 3932 // an error and we do not invalidate the static declaration. 3933 // NOTE: to avoid multiple warnings, only check the first declaration. 3934 if (Var->getPreviousDeclaration() == 0) 3935 RequireCompleteType(Var->getLocation(), Type, 3936 diag::ext_typecheck_decl_incomplete_type); 3937 } 3938 } 3939 3940 // Record the tentative definition; we're done. 3941 if (!Var->isInvalidDecl()) 3942 TentativeDefinitions.push_back(Var); 3943 return; 3944 } 3945 3946 // Provide a specific diagnostic for uninitialized variable 3947 // definitions with incomplete array type. 3948 if (Type->isIncompleteArrayType()) { 3949 Diag(Var->getLocation(), 3950 diag::err_typecheck_incomplete_array_needs_initializer); 3951 Var->setInvalidDecl(); 3952 return; 3953 } 3954 3955 // Provide a specific diagnostic for uninitialized variable 3956 // definitions with reference type. 3957 if (Type->isReferenceType()) { 3958 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 3959 << Var->getDeclName() 3960 << SourceRange(Var->getLocation(), Var->getLocation()); 3961 Var->setInvalidDecl(); 3962 return; 3963 } 3964 3965 // Do not attempt to type-check the default initializer for a 3966 // variable with dependent type. 3967 if (Type->isDependentType()) 3968 return; 3969 3970 if (Var->isInvalidDecl()) 3971 return; 3972 3973 if (RequireCompleteType(Var->getLocation(), 3974 Context.getBaseElementType(Type), 3975 diag::err_typecheck_decl_incomplete_type)) { 3976 Var->setInvalidDecl(); 3977 return; 3978 } 3979 3980 // The variable can not have an abstract class type. 3981 if (RequireNonAbstractType(Var->getLocation(), Type, 3982 diag::err_abstract_type_in_decl, 3983 AbstractVariableType)) { 3984 Var->setInvalidDecl(); 3985 return; 3986 } 3987 3988 const RecordType *Record 3989 = Context.getBaseElementType(Type)->getAs<RecordType>(); 3990 if (Record && getLangOptions().CPlusPlus && !getLangOptions().CPlusPlus0x && 3991 cast<CXXRecordDecl>(Record->getDecl())->isPOD()) { 3992 // C++03 [dcl.init]p9: 3993 // If no initializer is specified for an object, and the 3994 // object is of (possibly cv-qualified) non-POD class type (or 3995 // array thereof), the object shall be default-initialized; if 3996 // the object is of const-qualified type, the underlying class 3997 // type shall have a user-declared default 3998 // constructor. Otherwise, if no initializer is specified for 3999 // a non- static object, the object and its subobjects, if 4000 // any, have an indeterminate initial value); if the object 4001 // or any of its subobjects are of const-qualified type, the 4002 // program is ill-formed. 4003 // FIXME: DPG thinks it is very fishy that C++0x disables this. 4004 } else { 4005 InitializedEntity Entity = InitializedEntity::InitializeVariable(Var); 4006 InitializationKind Kind 4007 = InitializationKind::CreateDefault(Var->getLocation()); 4008 4009 InitializationSequence InitSeq(*this, Entity, Kind, 0, 0); 4010 OwningExprResult Init = InitSeq.Perform(*this, Entity, Kind, 4011 MultiExprArg(*this, 0, 0)); 4012 if (Init.isInvalid()) 4013 Var->setInvalidDecl(); 4014 else if (Init.get()) 4015 Var->setInit(MaybeCreateCXXExprWithTemporaries(Init.takeAs<Expr>())); 4016 } 4017 4018 if (!Var->isInvalidDecl() && getLangOptions().CPlusPlus && Record) 4019 FinalizeVarWithDestructor(Var, Record); 4020 } 4021} 4022 4023Sema::DeclGroupPtrTy Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, 4024 DeclPtrTy *Group, 4025 unsigned NumDecls) { 4026 llvm::SmallVector<Decl*, 8> Decls; 4027 4028 if (DS.isTypeSpecOwned()) 4029 Decls.push_back((Decl*)DS.getTypeRep()); 4030 4031 for (unsigned i = 0; i != NumDecls; ++i) 4032 if (Decl *D = Group[i].getAs<Decl>()) 4033 Decls.push_back(D); 4034 4035 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, 4036 Decls.data(), Decls.size())); 4037} 4038 4039 4040/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 4041/// to introduce parameters into function prototype scope. 4042Sema::DeclPtrTy 4043Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 4044 const DeclSpec &DS = D.getDeclSpec(); 4045 4046 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 4047 VarDecl::StorageClass StorageClass = VarDecl::None; 4048 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 4049 StorageClass = VarDecl::Register; 4050 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 4051 Diag(DS.getStorageClassSpecLoc(), 4052 diag::err_invalid_storage_class_in_func_decl); 4053 D.getMutableDeclSpec().ClearStorageClassSpecs(); 4054 } 4055 4056 if (D.getDeclSpec().isThreadSpecified()) 4057 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 4058 4059 DiagnoseFunctionSpecifiers(D); 4060 4061 // Check that there are no default arguments inside the type of this 4062 // parameter (C++ only). 4063 if (getLangOptions().CPlusPlus) 4064 CheckExtraCXXDefaultArguments(D); 4065 4066 TypeSourceInfo *TInfo = 0; 4067 TagDecl *OwnedDecl = 0; 4068 QualType parmDeclType = GetTypeForDeclarator(D, S, &TInfo, &OwnedDecl); 4069 4070 if (getLangOptions().CPlusPlus && OwnedDecl && OwnedDecl->isDefinition()) { 4071 // C++ [dcl.fct]p6: 4072 // Types shall not be defined in return or parameter types. 4073 Diag(OwnedDecl->getLocation(), diag::err_type_defined_in_param_type) 4074 << Context.getTypeDeclType(OwnedDecl); 4075 } 4076 4077 // Check for redeclaration of parameters, e.g. int foo(int x, int x); 4078 IdentifierInfo *II = D.getIdentifier(); 4079 if (II) { 4080 LookupResult R(*this, II, D.getIdentifierLoc(), LookupOrdinaryName, 4081 ForRedeclaration); 4082 LookupName(R, S); 4083 if (R.isSingleResult()) { 4084 NamedDecl *PrevDecl = R.getFoundDecl(); 4085 if (PrevDecl->isTemplateParameter()) { 4086 // Maybe we will complain about the shadowed template parameter. 4087 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 4088 // Just pretend that we didn't see the previous declaration. 4089 PrevDecl = 0; 4090 } else if (S->isDeclScope(DeclPtrTy::make(PrevDecl))) { 4091 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 4092 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 4093 4094 // Recover by removing the name 4095 II = 0; 4096 D.SetIdentifier(0, D.getIdentifierLoc()); 4097 D.setInvalidType(true); 4098 } 4099 } 4100 } 4101 4102 // Parameters can not be abstract class types. 4103 // For record types, this is done by the AbstractClassUsageDiagnoser once 4104 // the class has been completely parsed. 4105 if (!CurContext->isRecord() && 4106 RequireNonAbstractType(D.getIdentifierLoc(), parmDeclType, 4107 diag::err_abstract_type_in_decl, 4108 AbstractParamType)) 4109 D.setInvalidType(true); 4110 4111 QualType T = adjustParameterType(parmDeclType); 4112 4113 // Temporarily put parameter variables in the translation unit, not 4114 // the enclosing context. This prevents them from accidentally 4115 // looking like class members in C++. 4116 DeclContext *DC = Context.getTranslationUnitDecl(); 4117 4118 ParmVarDecl *New 4119 = ParmVarDecl::Create(Context, DC, D.getIdentifierLoc(), II, 4120 T, TInfo, StorageClass, 0); 4121 4122 if (D.isInvalidType()) 4123 New->setInvalidDecl(); 4124 4125 // Parameter declarators cannot be interface types. All ObjC objects are 4126 // passed by reference. 4127 if (T->isObjCInterfaceType()) { 4128 Diag(D.getIdentifierLoc(), 4129 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T; 4130 New->setInvalidDecl(); 4131 } 4132 4133 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 4134 if (D.getCXXScopeSpec().isSet()) { 4135 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 4136 << D.getCXXScopeSpec().getRange(); 4137 New->setInvalidDecl(); 4138 } 4139 4140 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage 4141 // duration shall not be qualified by an address-space qualifier." 4142 // Since all parameters have automatic store duration, they can not have 4143 // an address space. 4144 if (T.getAddressSpace() != 0) { 4145 Diag(D.getIdentifierLoc(), 4146 diag::err_arg_with_address_space); 4147 New->setInvalidDecl(); 4148 } 4149 4150 4151 // Add the parameter declaration into this scope. 4152 S->AddDecl(DeclPtrTy::make(New)); 4153 if (II) 4154 IdResolver.AddDecl(New); 4155 4156 ProcessDeclAttributes(S, New, D); 4157 4158 if (New->hasAttr<BlocksAttr>()) { 4159 Diag(New->getLocation(), diag::err_block_on_nonlocal); 4160 } 4161 return DeclPtrTy::make(New); 4162} 4163 4164void Sema::ActOnObjCCatchParam(DeclPtrTy D) { 4165 ParmVarDecl *Param = cast<ParmVarDecl>(D.getAs<Decl>()); 4166 Param->setDeclContext(CurContext); 4167} 4168 4169void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 4170 SourceLocation LocAfterDecls) { 4171 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 4172 "Not a function declarator!"); 4173 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 4174 4175 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 4176 // for a K&R function. 4177 if (!FTI.hasPrototype) { 4178 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 4179 --i; 4180 if (FTI.ArgInfo[i].Param == 0) { 4181 llvm::SmallString<256> Code; 4182 llvm::raw_svector_ostream(Code) << " int " 4183 << FTI.ArgInfo[i].Ident->getName() 4184 << ";\n"; 4185 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 4186 << FTI.ArgInfo[i].Ident 4187 << FixItHint::CreateInsertion(LocAfterDecls, Code.str()); 4188 4189 // Implicitly declare the argument as type 'int' for lack of a better 4190 // type. 4191 DeclSpec DS; 4192 const char* PrevSpec; // unused 4193 unsigned DiagID; // unused 4194 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 4195 PrevSpec, DiagID); 4196 Declarator ParamD(DS, Declarator::KNRTypeListContext); 4197 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 4198 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 4199 } 4200 } 4201 } 4202} 4203 4204Sema::DeclPtrTy Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, 4205 Declarator &D) { 4206 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 4207 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 4208 "Not a function declarator!"); 4209 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 4210 4211 if (FTI.hasPrototype) { 4212 // FIXME: Diagnose arguments without names in C. 4213 } 4214 4215 Scope *ParentScope = FnBodyScope->getParent(); 4216 4217 DeclPtrTy DP = HandleDeclarator(ParentScope, D, 4218 MultiTemplateParamsArg(*this), 4219 /*IsFunctionDefinition=*/true); 4220 return ActOnStartOfFunctionDef(FnBodyScope, DP); 4221} 4222 4223static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD) { 4224 // Don't warn about invalid declarations. 4225 if (FD->isInvalidDecl()) 4226 return false; 4227 4228 // Or declarations that aren't global. 4229 if (!FD->isGlobal()) 4230 return false; 4231 4232 // Don't warn about C++ member functions. 4233 if (isa<CXXMethodDecl>(FD)) 4234 return false; 4235 4236 // Don't warn about 'main'. 4237 if (FD->isMain()) 4238 return false; 4239 4240 // Don't warn about inline functions. 4241 if (FD->isInlineSpecified()) 4242 return false; 4243 4244 // Don't warn about function templates. 4245 if (FD->getDescribedFunctionTemplate()) 4246 return false; 4247 4248 // Don't warn about function template specializations. 4249 if (FD->isFunctionTemplateSpecialization()) 4250 return false; 4251 4252 bool MissingPrototype = true; 4253 for (const FunctionDecl *Prev = FD->getPreviousDeclaration(); 4254 Prev; Prev = Prev->getPreviousDeclaration()) { 4255 // Ignore any declarations that occur in function or method 4256 // scope, because they aren't visible from the header. 4257 if (Prev->getDeclContext()->isFunctionOrMethod()) 4258 continue; 4259 4260 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 4261 break; 4262 } 4263 4264 return MissingPrototype; 4265} 4266 4267Sema::DeclPtrTy Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, DeclPtrTy D) { 4268 // Clear the last template instantiation error context. 4269 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation(); 4270 4271 if (!D) 4272 return D; 4273 FunctionDecl *FD = 0; 4274 4275 if (FunctionTemplateDecl *FunTmpl 4276 = dyn_cast<FunctionTemplateDecl>(D.getAs<Decl>())) 4277 FD = FunTmpl->getTemplatedDecl(); 4278 else 4279 FD = cast<FunctionDecl>(D.getAs<Decl>()); 4280 4281 // Enter a new function scope 4282 PushFunctionScope(); 4283 4284 // See if this is a redefinition. 4285 // But don't complain if we're in GNU89 mode and the previous definition 4286 // was an extern inline function. 4287 const FunctionDecl *Definition; 4288 if (FD->getBody(Definition) && 4289 !canRedefineFunction(Definition, getLangOptions())) { 4290 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 4291 Diag(Definition->getLocation(), diag::note_previous_definition); 4292 } 4293 4294 // Builtin functions cannot be defined. 4295 if (unsigned BuiltinID = FD->getBuiltinID()) { 4296 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 4297 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 4298 FD->setInvalidDecl(); 4299 } 4300 } 4301 4302 // The return type of a function definition must be complete 4303 // (C99 6.9.1p3, C++ [dcl.fct]p6). 4304 QualType ResultType = FD->getResultType(); 4305 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 4306 !FD->isInvalidDecl() && 4307 RequireCompleteType(FD->getLocation(), ResultType, 4308 diag::err_func_def_incomplete_result)) 4309 FD->setInvalidDecl(); 4310 4311 // GNU warning -Wmissing-prototypes: 4312 // Warn if a global function is defined without a previous 4313 // prototype declaration. This warning is issued even if the 4314 // definition itself provides a prototype. The aim is to detect 4315 // global functions that fail to be declared in header files. 4316 if (ShouldWarnAboutMissingPrototype(FD)) 4317 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 4318 4319 if (FnBodyScope) 4320 PushDeclContext(FnBodyScope, FD); 4321 4322 // Check the validity of our function parameters 4323 CheckParmsForFunctionDef(FD); 4324 4325 bool ShouldCheckShadow = 4326 Diags.getDiagnosticLevel(diag::warn_decl_shadow) != Diagnostic::Ignored; 4327 4328 // Introduce our parameters into the function scope 4329 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 4330 ParmVarDecl *Param = FD->getParamDecl(p); 4331 Param->setOwningFunction(FD); 4332 4333 // If this has an identifier, add it to the scope stack. 4334 if (Param->getIdentifier() && FnBodyScope) { 4335 if (ShouldCheckShadow) 4336 CheckShadow(FnBodyScope, Param); 4337 4338 PushOnScopeChains(Param, FnBodyScope); 4339 } 4340 } 4341 4342 // Checking attributes of current function definition 4343 // dllimport attribute. 4344 if (FD->getAttr<DLLImportAttr>() && 4345 (!FD->getAttr<DLLExportAttr>())) { 4346 // dllimport attribute cannot be applied to definition. 4347 if (!(FD->getAttr<DLLImportAttr>())->isInherited()) { 4348 Diag(FD->getLocation(), 4349 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 4350 << "dllimport"; 4351 FD->setInvalidDecl(); 4352 return DeclPtrTy::make(FD); 4353 } 4354 4355 // Visual C++ appears to not think this is an issue, so only issue 4356 // a warning when Microsoft extensions are disabled. 4357 if (!LangOpts.Microsoft) { 4358 // If a symbol previously declared dllimport is later defined, the 4359 // attribute is ignored in subsequent references, and a warning is 4360 // emitted. 4361 Diag(FD->getLocation(), 4362 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 4363 << FD->getNameAsCString() << "dllimport"; 4364 } 4365 } 4366 return DeclPtrTy::make(FD); 4367} 4368 4369Sema::DeclPtrTy Sema::ActOnFinishFunctionBody(DeclPtrTy D, StmtArg BodyArg) { 4370 return ActOnFinishFunctionBody(D, move(BodyArg), false); 4371} 4372 4373Sema::DeclPtrTy Sema::ActOnFinishFunctionBody(DeclPtrTy D, StmtArg BodyArg, 4374 bool IsInstantiation) { 4375 Decl *dcl = D.getAs<Decl>(); 4376 Stmt *Body = BodyArg.takeAs<Stmt>(); 4377 4378 FunctionDecl *FD = 0; 4379 FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl); 4380 if (FunTmpl) 4381 FD = FunTmpl->getTemplatedDecl(); 4382 else 4383 FD = dyn_cast_or_null<FunctionDecl>(dcl); 4384 4385 sema::AnalysisBasedWarnings::Policy WP = AnalysisWarnings.getDefaultPolicy(); 4386 4387 if (FD) { 4388 FD->setBody(Body); 4389 if (FD->isMain()) { 4390 // C and C++ allow for main to automagically return 0. 4391 // Implements C++ [basic.start.main]p5 and C99 5.1.2.2.3. 4392 FD->setHasImplicitReturnZero(true); 4393 WP.disableCheckFallThrough(); 4394 } 4395 4396 if (!FD->isInvalidDecl()) 4397 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end()); 4398 4399 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(FD)) 4400 MaybeMarkVirtualMembersReferenced(Method->getLocation(), Method); 4401 4402 assert(FD == getCurFunctionDecl() && "Function parsing confused"); 4403 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 4404 assert(MD == getCurMethodDecl() && "Method parsing confused"); 4405 MD->setBody(Body); 4406 MD->setEndLoc(Body->getLocEnd()); 4407 if (!MD->isInvalidDecl()) 4408 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end()); 4409 } else { 4410 Body->Destroy(Context); 4411 return DeclPtrTy(); 4412 } 4413 4414 // Verify and clean out per-function state. 4415 4416 // Check goto/label use. 4417 for (llvm::DenseMap<IdentifierInfo*, LabelStmt*>::iterator 4418 I = getLabelMap().begin(), E = getLabelMap().end(); I != E; ++I) { 4419 LabelStmt *L = I->second; 4420 4421 // Verify that we have no forward references left. If so, there was a goto 4422 // or address of a label taken, but no definition of it. Label fwd 4423 // definitions are indicated with a null substmt. 4424 if (L->getSubStmt() != 0) 4425 continue; 4426 4427 // Emit error. 4428 Diag(L->getIdentLoc(), diag::err_undeclared_label_use) << L->getName(); 4429 4430 // At this point, we have gotos that use the bogus label. Stitch it into 4431 // the function body so that they aren't leaked and that the AST is well 4432 // formed. 4433 if (Body == 0) { 4434 // The whole function wasn't parsed correctly, just delete this. 4435 L->Destroy(Context); 4436 continue; 4437 } 4438 4439 // Otherwise, the body is valid: we want to stitch the label decl into the 4440 // function somewhere so that it is properly owned and so that the goto 4441 // has a valid target. Do this by creating a new compound stmt with the 4442 // label in it. 4443 4444 // Give the label a sub-statement. 4445 L->setSubStmt(new (Context) NullStmt(L->getIdentLoc())); 4446 4447 CompoundStmt *Compound = isa<CXXTryStmt>(Body) ? 4448 cast<CXXTryStmt>(Body)->getTryBlock() : 4449 cast<CompoundStmt>(Body); 4450 llvm::SmallVector<Stmt*, 64> Elements(Compound->body_begin(), 4451 Compound->body_end()); 4452 Elements.push_back(L); 4453 Compound->setStmts(Context, Elements.data(), Elements.size()); 4454 } 4455 4456 if (Body) { 4457 // C++ constructors that have function-try-blocks can't have return 4458 // statements in the handlers of that block. (C++ [except.handle]p14) 4459 // Verify this. 4460 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body)) 4461 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); 4462 4463 // Verify that that gotos and switch cases don't jump into scopes illegally. 4464 // Verify that that gotos and switch cases don't jump into scopes illegally. 4465 if (FunctionNeedsScopeChecking() && !hasAnyErrorsInThisFunction()) 4466 DiagnoseInvalidJumps(Body); 4467 4468 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) 4469 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 4470 Destructor->getParent()); 4471 4472 // If any errors have occurred, clear out any temporaries that may have 4473 // been leftover. This ensures that these temporaries won't be picked up for 4474 // deletion in some later function. 4475 if (PP.getDiagnostics().hasErrorOccurred()) 4476 ExprTemporaries.clear(); 4477 else if (!isa<FunctionTemplateDecl>(dcl)) { 4478 // Since the body is valid, issue any analysis-based warnings that are 4479 // enabled. 4480 QualType ResultType; 4481 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(dcl)) { 4482 ResultType = FD->getResultType(); 4483 } 4484 else { 4485 ObjCMethodDecl *MD = cast<ObjCMethodDecl>(dcl); 4486 ResultType = MD->getResultType(); 4487 } 4488 AnalysisWarnings.IssueWarnings(WP, dcl); 4489 } 4490 4491 assert(ExprTemporaries.empty() && "Leftover temporaries in function"); 4492 } 4493 4494 if (!IsInstantiation) 4495 PopDeclContext(); 4496 4497 PopFunctionOrBlockScope(); 4498 4499 // If any errors have occurred, clear out any temporaries that may have 4500 // been leftover. This ensures that these temporaries won't be picked up for 4501 // deletion in some later function. 4502 if (getDiagnostics().hasErrorOccurred()) 4503 ExprTemporaries.clear(); 4504 4505 return D; 4506} 4507 4508/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 4509/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 4510NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 4511 IdentifierInfo &II, Scope *S) { 4512 // Before we produce a declaration for an implicitly defined 4513 // function, see whether there was a locally-scoped declaration of 4514 // this name as a function or variable. If so, use that 4515 // (non-visible) declaration, and complain about it. 4516 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 4517 = LocallyScopedExternalDecls.find(&II); 4518 if (Pos != LocallyScopedExternalDecls.end()) { 4519 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 4520 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 4521 return Pos->second; 4522 } 4523 4524 // Extension in C99. Legal in C90, but warn about it. 4525 if (II.getName().startswith("__builtin_")) 4526 Diag(Loc, diag::warn_builtin_unknown) << &II; 4527 else if (getLangOptions().C99) 4528 Diag(Loc, diag::ext_implicit_function_decl) << &II; 4529 else 4530 Diag(Loc, diag::warn_implicit_function_decl) << &II; 4531 4532 // Set a Declarator for the implicit definition: int foo(); 4533 const char *Dummy; 4534 DeclSpec DS; 4535 unsigned DiagID; 4536 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID); 4537 Error = Error; // Silence warning. 4538 assert(!Error && "Error setting up implicit decl!"); 4539 Declarator D(DS, Declarator::BlockContext); 4540 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0, 4541 0, 0, false, SourceLocation(), 4542 false, 0,0,0, Loc, Loc, D), 4543 SourceLocation()); 4544 D.SetIdentifier(&II, Loc); 4545 4546 // Insert this function into translation-unit scope. 4547 4548 DeclContext *PrevDC = CurContext; 4549 CurContext = Context.getTranslationUnitDecl(); 4550 4551 FunctionDecl *FD = 4552 dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D).getAs<Decl>()); 4553 FD->setImplicit(); 4554 4555 CurContext = PrevDC; 4556 4557 AddKnownFunctionAttributes(FD); 4558 4559 return FD; 4560} 4561 4562/// \brief Adds any function attributes that we know a priori based on 4563/// the declaration of this function. 4564/// 4565/// These attributes can apply both to implicitly-declared builtins 4566/// (like __builtin___printf_chk) or to library-declared functions 4567/// like NSLog or printf. 4568void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 4569 if (FD->isInvalidDecl()) 4570 return; 4571 4572 // If this is a built-in function, map its builtin attributes to 4573 // actual attributes. 4574 if (unsigned BuiltinID = FD->getBuiltinID()) { 4575 // Handle printf-formatting attributes. 4576 unsigned FormatIdx; 4577 bool HasVAListArg; 4578 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 4579 if (!FD->getAttr<FormatAttr>()) 4580 FD->addAttr(::new (Context) FormatAttr(Context, "printf", FormatIdx+1, 4581 HasVAListArg ? 0 : FormatIdx+2)); 4582 } 4583 4584 // Mark const if we don't care about errno and that is the only 4585 // thing preventing the function from being const. This allows 4586 // IRgen to use LLVM intrinsics for such functions. 4587 if (!getLangOptions().MathErrno && 4588 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 4589 if (!FD->getAttr<ConstAttr>()) 4590 FD->addAttr(::new (Context) ConstAttr()); 4591 } 4592 4593 if (Context.BuiltinInfo.isNoReturn(BuiltinID)) 4594 FD->setType(Context.getNoReturnType(FD->getType())); 4595 if (Context.BuiltinInfo.isNoThrow(BuiltinID)) 4596 FD->addAttr(::new (Context) NoThrowAttr()); 4597 if (Context.BuiltinInfo.isConst(BuiltinID)) 4598 FD->addAttr(::new (Context) ConstAttr()); 4599 } 4600 4601 IdentifierInfo *Name = FD->getIdentifier(); 4602 if (!Name) 4603 return; 4604 if ((!getLangOptions().CPlusPlus && 4605 FD->getDeclContext()->isTranslationUnit()) || 4606 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 4607 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 4608 LinkageSpecDecl::lang_c)) { 4609 // Okay: this could be a libc/libm/Objective-C function we know 4610 // about. 4611 } else 4612 return; 4613 4614 if (Name->isStr("NSLog") || Name->isStr("NSLogv")) { 4615 // FIXME: NSLog and NSLogv should be target specific 4616 if (const FormatAttr *Format = FD->getAttr<FormatAttr>()) { 4617 // FIXME: We known better than our headers. 4618 const_cast<FormatAttr *>(Format)->setType(Context, "printf"); 4619 } else 4620 FD->addAttr(::new (Context) FormatAttr(Context, "printf", 1, 4621 Name->isStr("NSLogv") ? 0 : 2)); 4622 } else if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { 4623 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be 4624 // target-specific builtins, perhaps? 4625 if (!FD->getAttr<FormatAttr>()) 4626 FD->addAttr(::new (Context) FormatAttr(Context, "printf", 2, 4627 Name->isStr("vasprintf") ? 0 : 3)); 4628 } 4629} 4630 4631TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 4632 TypeSourceInfo *TInfo) { 4633 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 4634 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 4635 4636 if (!TInfo) { 4637 assert(D.isInvalidType() && "no declarator info for valid type"); 4638 TInfo = Context.getTrivialTypeSourceInfo(T); 4639 } 4640 4641 // Scope manipulation handled by caller. 4642 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 4643 D.getIdentifierLoc(), 4644 D.getIdentifier(), 4645 TInfo); 4646 4647 if (const TagType *TT = T->getAs<TagType>()) { 4648 TagDecl *TD = TT->getDecl(); 4649 4650 // If the TagDecl that the TypedefDecl points to is an anonymous decl 4651 // keep track of the TypedefDecl. 4652 if (!TD->getIdentifier() && !TD->getTypedefForAnonDecl()) 4653 TD->setTypedefForAnonDecl(NewTD); 4654 } 4655 4656 if (D.isInvalidType()) 4657 NewTD->setInvalidDecl(); 4658 return NewTD; 4659} 4660 4661 4662/// \brief Determine whether a tag with a given kind is acceptable 4663/// as a redeclaration of the given tag declaration. 4664/// 4665/// \returns true if the new tag kind is acceptable, false otherwise. 4666bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, 4667 TagDecl::TagKind NewTag, 4668 SourceLocation NewTagLoc, 4669 const IdentifierInfo &Name) { 4670 // C++ [dcl.type.elab]p3: 4671 // The class-key or enum keyword present in the 4672 // elaborated-type-specifier shall agree in kind with the 4673 // declaration to which the name in theelaborated-type-specifier 4674 // refers. This rule also applies to the form of 4675 // elaborated-type-specifier that declares a class-name or 4676 // friend class since it can be construed as referring to the 4677 // definition of the class. Thus, in any 4678 // elaborated-type-specifier, the enum keyword shall be used to 4679 // refer to an enumeration (7.2), the union class-keyshall be 4680 // used to refer to a union (clause 9), and either the class or 4681 // struct class-key shall be used to refer to a class (clause 9) 4682 // declared using the class or struct class-key. 4683 TagDecl::TagKind OldTag = Previous->getTagKind(); 4684 if (OldTag == NewTag) 4685 return true; 4686 4687 if ((OldTag == TagDecl::TK_struct || OldTag == TagDecl::TK_class) && 4688 (NewTag == TagDecl::TK_struct || NewTag == TagDecl::TK_class)) { 4689 // Warn about the struct/class tag mismatch. 4690 bool isTemplate = false; 4691 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) 4692 isTemplate = Record->getDescribedClassTemplate(); 4693 4694 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 4695 << (NewTag == TagDecl::TK_class) 4696 << isTemplate << &Name 4697 << FixItHint::CreateReplacement(SourceRange(NewTagLoc), 4698 OldTag == TagDecl::TK_class? "class" : "struct"); 4699 Diag(Previous->getLocation(), diag::note_previous_use); 4700 return true; 4701 } 4702 return false; 4703} 4704 4705/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 4706/// former case, Name will be non-null. In the later case, Name will be null. 4707/// TagSpec indicates what kind of tag this is. TUK indicates whether this is a 4708/// reference/declaration/definition of a tag. 4709Sema::DeclPtrTy Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK, 4710 SourceLocation KWLoc, const CXXScopeSpec &SS, 4711 IdentifierInfo *Name, SourceLocation NameLoc, 4712 AttributeList *Attr, AccessSpecifier AS, 4713 MultiTemplateParamsArg TemplateParameterLists, 4714 bool &OwnedDecl, bool &IsDependent) { 4715 // If this is not a definition, it must have a name. 4716 assert((Name != 0 || TUK == TUK_Definition) && 4717 "Nameless record must be a definition!"); 4718 4719 OwnedDecl = false; 4720 TagDecl::TagKind Kind = TagDecl::getTagKindForTypeSpec(TagSpec); 4721 4722 // FIXME: Check explicit specializations more carefully. 4723 bool isExplicitSpecialization = false; 4724 if (TUK != TUK_Reference) { 4725 if (TemplateParameterList *TemplateParams 4726 = MatchTemplateParametersToScopeSpecifier(KWLoc, SS, 4727 (TemplateParameterList**)TemplateParameterLists.get(), 4728 TemplateParameterLists.size(), 4729 isExplicitSpecialization)) { 4730 if (TemplateParams->size() > 0) { 4731 // This is a declaration or definition of a class template (which may 4732 // be a member of another template). 4733 OwnedDecl = false; 4734 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc, 4735 SS, Name, NameLoc, Attr, 4736 TemplateParams, 4737 AS); 4738 TemplateParameterLists.release(); 4739 return Result.get(); 4740 } else { 4741 // The "template<>" header is extraneous. 4742 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 4743 << ElaboratedType::getNameForTagKind(Kind) << Name; 4744 isExplicitSpecialization = true; 4745 } 4746 } 4747 4748 TemplateParameterLists.release(); 4749 } 4750 4751 DeclContext *SearchDC = CurContext; 4752 DeclContext *DC = CurContext; 4753 bool isStdBadAlloc = false; 4754 bool Invalid = false; 4755 4756 RedeclarationKind Redecl = ForRedeclaration; 4757 if (TUK == TUK_Friend || TUK == TUK_Reference) 4758 Redecl = NotForRedeclaration; 4759 4760 LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl); 4761 4762 if (Name && SS.isNotEmpty()) { 4763 // We have a nested-name tag ('struct foo::bar'). 4764 4765 // Check for invalid 'foo::'. 4766 if (SS.isInvalid()) { 4767 Name = 0; 4768 goto CreateNewDecl; 4769 } 4770 4771 // If this is a friend or a reference to a class in a dependent 4772 // context, don't try to make a decl for it. 4773 if (TUK == TUK_Friend || TUK == TUK_Reference) { 4774 DC = computeDeclContext(SS, false); 4775 if (!DC) { 4776 IsDependent = true; 4777 return DeclPtrTy(); 4778 } 4779 } 4780 4781 if (RequireCompleteDeclContext(SS)) 4782 return DeclPtrTy::make((Decl *)0); 4783 4784 DC = computeDeclContext(SS, true); 4785 SearchDC = DC; 4786 // Look-up name inside 'foo::'. 4787 LookupQualifiedName(Previous, DC); 4788 4789 if (Previous.isAmbiguous()) 4790 return DeclPtrTy(); 4791 4792 if (Previous.empty()) { 4793 // Name lookup did not find anything. However, if the 4794 // nested-name-specifier refers to the current instantiation, 4795 // and that current instantiation has any dependent base 4796 // classes, we might find something at instantiation time: treat 4797 // this as a dependent elaborated-type-specifier. 4798 if (Previous.wasNotFoundInCurrentInstantiation()) { 4799 IsDependent = true; 4800 return DeclPtrTy(); 4801 } 4802 4803 // A tag 'foo::bar' must already exist. 4804 Diag(NameLoc, diag::err_not_tag_in_scope) 4805 << Kind << Name << DC << SS.getRange(); 4806 Name = 0; 4807 Invalid = true; 4808 goto CreateNewDecl; 4809 } 4810 } else if (Name) { 4811 // If this is a named struct, check to see if there was a previous forward 4812 // declaration or definition. 4813 // FIXME: We're looking into outer scopes here, even when we 4814 // shouldn't be. Doing so can result in ambiguities that we 4815 // shouldn't be diagnosing. 4816 LookupName(Previous, S); 4817 4818 // Note: there used to be some attempt at recovery here. 4819 if (Previous.isAmbiguous()) 4820 return DeclPtrTy(); 4821 4822 if (!getLangOptions().CPlusPlus && TUK != TUK_Reference) { 4823 // FIXME: This makes sure that we ignore the contexts associated 4824 // with C structs, unions, and enums when looking for a matching 4825 // tag declaration or definition. See the similar lookup tweak 4826 // in Sema::LookupName; is there a better way to deal with this? 4827 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 4828 SearchDC = SearchDC->getParent(); 4829 } 4830 } 4831 4832 if (Previous.isSingleResult() && 4833 Previous.getFoundDecl()->isTemplateParameter()) { 4834 // Maybe we will complain about the shadowed template parameter. 4835 DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl()); 4836 // Just pretend that we didn't see the previous declaration. 4837 Previous.clear(); 4838 } 4839 4840 if (getLangOptions().CPlusPlus && Name && DC && StdNamespace && 4841 DC->Equals(StdNamespace) && Name->isStr("bad_alloc")) { 4842 // This is a declaration of or a reference to "std::bad_alloc". 4843 isStdBadAlloc = true; 4844 4845 if (Previous.empty() && StdBadAlloc) { 4846 // std::bad_alloc has been implicitly declared (but made invisible to 4847 // name lookup). Fill in this implicit declaration as the previous 4848 // declaration, so that the declarations get chained appropriately. 4849 Previous.addDecl(StdBadAlloc); 4850 } 4851 } 4852 4853 // If we didn't find a previous declaration, and this is a reference 4854 // (or friend reference), move to the correct scope. In C++, we 4855 // also need to do a redeclaration lookup there, just in case 4856 // there's a shadow friend decl. 4857 if (Name && Previous.empty() && 4858 (TUK == TUK_Reference || TUK == TUK_Friend)) { 4859 if (Invalid) goto CreateNewDecl; 4860 assert(SS.isEmpty()); 4861 4862 if (TUK == TUK_Reference) { 4863 // C++ [basic.scope.pdecl]p5: 4864 // -- for an elaborated-type-specifier of the form 4865 // 4866 // class-key identifier 4867 // 4868 // if the elaborated-type-specifier is used in the 4869 // decl-specifier-seq or parameter-declaration-clause of a 4870 // function defined in namespace scope, the identifier is 4871 // declared as a class-name in the namespace that contains 4872 // the declaration; otherwise, except as a friend 4873 // declaration, the identifier is declared in the smallest 4874 // non-class, non-function-prototype scope that contains the 4875 // declaration. 4876 // 4877 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 4878 // C structs and unions. 4879 // 4880 // It is an error in C++ to declare (rather than define) an enum 4881 // type, including via an elaborated type specifier. We'll 4882 // diagnose that later; for now, declare the enum in the same 4883 // scope as we would have picked for any other tag type. 4884 // 4885 // GNU C also supports this behavior as part of its incomplete 4886 // enum types extension, while GNU C++ does not. 4887 // 4888 // Find the context where we'll be declaring the tag. 4889 // FIXME: We would like to maintain the current DeclContext as the 4890 // lexical context, 4891 while (SearchDC->isRecord()) 4892 SearchDC = SearchDC->getParent(); 4893 4894 // Find the scope where we'll be declaring the tag. 4895 while (S->isClassScope() || 4896 (getLangOptions().CPlusPlus && 4897 S->isFunctionPrototypeScope()) || 4898 ((S->getFlags() & Scope::DeclScope) == 0) || 4899 (S->getEntity() && 4900 ((DeclContext *)S->getEntity())->isTransparentContext())) 4901 S = S->getParent(); 4902 } else { 4903 assert(TUK == TUK_Friend); 4904 // C++ [namespace.memdef]p3: 4905 // If a friend declaration in a non-local class first declares a 4906 // class or function, the friend class or function is a member of 4907 // the innermost enclosing namespace. 4908 SearchDC = SearchDC->getEnclosingNamespaceContext(); 4909 4910 // Look up through our scopes until we find one with an entity which 4911 // matches our declaration context. 4912 while (S->getEntity() && 4913 ((DeclContext *)S->getEntity())->getPrimaryContext() != SearchDC) { 4914 S = S->getParent(); 4915 assert(S && "No enclosing scope matching the enclosing namespace."); 4916 } 4917 } 4918 4919 // In C++, look for a shadow friend decl. 4920 if (getLangOptions().CPlusPlus) { 4921 Previous.setRedeclarationKind(ForRedeclaration); 4922 LookupQualifiedName(Previous, SearchDC); 4923 } 4924 } 4925 4926 if (!Previous.empty()) { 4927 assert(Previous.isSingleResult()); 4928 NamedDecl *PrevDecl = Previous.getFoundDecl(); 4929 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 4930 // If this is a use of a previous tag, or if the tag is already declared 4931 // in the same scope (so that the definition/declaration completes or 4932 // rementions the tag), reuse the decl. 4933 if (TUK == TUK_Reference || TUK == TUK_Friend || 4934 isDeclInScope(PrevDecl, SearchDC, S)) { 4935 // Make sure that this wasn't declared as an enum and now used as a 4936 // struct or something similar. 4937 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, KWLoc, *Name)) { 4938 bool SafeToContinue 4939 = (PrevTagDecl->getTagKind() != TagDecl::TK_enum && 4940 Kind != TagDecl::TK_enum); 4941 if (SafeToContinue) 4942 Diag(KWLoc, diag::err_use_with_wrong_tag) 4943 << Name 4944 << FixItHint::CreateReplacement(SourceRange(KWLoc), 4945 PrevTagDecl->getKindName()); 4946 else 4947 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 4948 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 4949 4950 if (SafeToContinue) 4951 Kind = PrevTagDecl->getTagKind(); 4952 else { 4953 // Recover by making this an anonymous redefinition. 4954 Name = 0; 4955 Previous.clear(); 4956 Invalid = true; 4957 } 4958 } 4959 4960 if (!Invalid) { 4961 // If this is a use, just return the declaration we found. 4962 4963 // FIXME: In the future, return a variant or some other clue 4964 // for the consumer of this Decl to know it doesn't own it. 4965 // For our current ASTs this shouldn't be a problem, but will 4966 // need to be changed with DeclGroups. 4967 if (TUK == TUK_Reference || TUK == TUK_Friend) 4968 return DeclPtrTy::make(PrevTagDecl); 4969 4970 // Diagnose attempts to redefine a tag. 4971 if (TUK == TUK_Definition) { 4972 if (TagDecl *Def = PrevTagDecl->getDefinition()) { 4973 // If we're defining a specialization and the previous definition 4974 // is from an implicit instantiation, don't emit an error 4975 // here; we'll catch this in the general case below. 4976 if (!isExplicitSpecialization || 4977 !isa<CXXRecordDecl>(Def) || 4978 cast<CXXRecordDecl>(Def)->getTemplateSpecializationKind() 4979 == TSK_ExplicitSpecialization) { 4980 Diag(NameLoc, diag::err_redefinition) << Name; 4981 Diag(Def->getLocation(), diag::note_previous_definition); 4982 // If this is a redefinition, recover by making this 4983 // struct be anonymous, which will make any later 4984 // references get the previous definition. 4985 Name = 0; 4986 Previous.clear(); 4987 Invalid = true; 4988 } 4989 } else { 4990 // If the type is currently being defined, complain 4991 // about a nested redefinition. 4992 TagType *Tag = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 4993 if (Tag->isBeingDefined()) { 4994 Diag(NameLoc, diag::err_nested_redefinition) << Name; 4995 Diag(PrevTagDecl->getLocation(), 4996 diag::note_previous_definition); 4997 Name = 0; 4998 Previous.clear(); 4999 Invalid = true; 5000 } 5001 } 5002 5003 // Okay, this is definition of a previously declared or referenced 5004 // tag PrevDecl. We're going to create a new Decl for it. 5005 } 5006 } 5007 // If we get here we have (another) forward declaration or we 5008 // have a definition. Just create a new decl. 5009 5010 } else { 5011 // If we get here, this is a definition of a new tag type in a nested 5012 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 5013 // new decl/type. We set PrevDecl to NULL so that the entities 5014 // have distinct types. 5015 Previous.clear(); 5016 } 5017 // If we get here, we're going to create a new Decl. If PrevDecl 5018 // is non-NULL, it's a definition of the tag declared by 5019 // PrevDecl. If it's NULL, we have a new definition. 5020 } else { 5021 // PrevDecl is a namespace, template, or anything else 5022 // that lives in the IDNS_Tag identifier namespace. 5023 if (TUK == TUK_Reference || TUK == TUK_Friend || 5024 isDeclInScope(PrevDecl, SearchDC, S)) { 5025 // The tag name clashes with a namespace name, issue an error and 5026 // recover by making this tag be anonymous. 5027 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 5028 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5029 Name = 0; 5030 Previous.clear(); 5031 Invalid = true; 5032 } else { 5033 // The existing declaration isn't relevant to us; we're in a 5034 // new scope, so clear out the previous declaration. 5035 Previous.clear(); 5036 } 5037 } 5038 } 5039 5040CreateNewDecl: 5041 5042 TagDecl *PrevDecl = 0; 5043 if (Previous.isSingleResult()) 5044 PrevDecl = cast<TagDecl>(Previous.getFoundDecl()); 5045 5046 // If there is an identifier, use the location of the identifier as the 5047 // location of the decl, otherwise use the location of the struct/union 5048 // keyword. 5049 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 5050 5051 // Otherwise, create a new declaration. If there is a previous 5052 // declaration of the same entity, the two will be linked via 5053 // PrevDecl. 5054 TagDecl *New; 5055 5056 if (Kind == TagDecl::TK_enum) { 5057 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 5058 // enum X { A, B, C } D; D should chain to X. 5059 New = EnumDecl::Create(Context, SearchDC, Loc, Name, KWLoc, 5060 cast_or_null<EnumDecl>(PrevDecl)); 5061 // If this is an undefined enum, warn. 5062 if (TUK != TUK_Definition && !Invalid) { 5063 unsigned DK = getLangOptions().CPlusPlus? diag::err_forward_ref_enum 5064 : diag::ext_forward_ref_enum; 5065 Diag(Loc, DK); 5066 } 5067 } else { 5068 // struct/union/class 5069 5070 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 5071 // struct X { int A; } D; D should chain to X. 5072 if (getLangOptions().CPlusPlus) { 5073 // FIXME: Look for a way to use RecordDecl for simple structs. 5074 New = CXXRecordDecl::Create(Context, Kind, SearchDC, Loc, Name, KWLoc, 5075 cast_or_null<CXXRecordDecl>(PrevDecl)); 5076 5077 if (isStdBadAlloc && (!StdBadAlloc || StdBadAlloc->isImplicit())) 5078 StdBadAlloc = cast<CXXRecordDecl>(New); 5079 } else 5080 New = RecordDecl::Create(Context, Kind, SearchDC, Loc, Name, KWLoc, 5081 cast_or_null<RecordDecl>(PrevDecl)); 5082 } 5083 5084 // Maybe add qualifier info. 5085 if (SS.isNotEmpty()) { 5086 NestedNameSpecifier *NNS 5087 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 5088 New->setQualifierInfo(NNS, SS.getRange()); 5089 } 5090 5091 if (Kind != TagDecl::TK_enum) { 5092 // Handle #pragma pack: if the #pragma pack stack has non-default 5093 // alignment, make up a packed attribute for this decl. These 5094 // attributes are checked when the ASTContext lays out the 5095 // structure. 5096 // 5097 // It is important for implementing the correct semantics that this 5098 // happen here (in act on tag decl). The #pragma pack stack is 5099 // maintained as a result of parser callbacks which can occur at 5100 // many points during the parsing of a struct declaration (because 5101 // the #pragma tokens are effectively skipped over during the 5102 // parsing of the struct). 5103 if (unsigned Alignment = getPragmaPackAlignment()) 5104 New->addAttr(::new (Context) PragmaPackAttr(Alignment * 8)); 5105 } 5106 5107 if (getLangOptions().CPlusPlus && SS.isEmpty() && Name && !Invalid) { 5108 // C++ [dcl.typedef]p3: 5109 // [...] Similarly, in a given scope, a class or enumeration 5110 // shall not be declared with the same name as a typedef-name 5111 // that is declared in that scope and refers to a type other 5112 // than the class or enumeration itself. 5113 LookupResult Lookup(*this, Name, NameLoc, LookupOrdinaryName, 5114 ForRedeclaration); 5115 LookupName(Lookup, S); 5116 TypedefDecl *PrevTypedef = Lookup.getAsSingle<TypedefDecl>(); 5117 NamedDecl *PrevTypedefNamed = PrevTypedef; 5118 if (PrevTypedef && isDeclInScope(PrevTypedefNamed, SearchDC, S) && 5119 Context.getCanonicalType(Context.getTypeDeclType(PrevTypedef)) != 5120 Context.getCanonicalType(Context.getTypeDeclType(New))) { 5121 Diag(Loc, diag::err_tag_definition_of_typedef) 5122 << Context.getTypeDeclType(New) 5123 << PrevTypedef->getUnderlyingType(); 5124 Diag(PrevTypedef->getLocation(), diag::note_previous_definition); 5125 Invalid = true; 5126 } 5127 } 5128 5129 // If this is a specialization of a member class (of a class template), 5130 // check the specialization. 5131 if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous)) 5132 Invalid = true; 5133 5134 if (Invalid) 5135 New->setInvalidDecl(); 5136 5137 if (Attr) 5138 ProcessDeclAttributeList(S, New, Attr); 5139 5140 // If we're declaring or defining a tag in function prototype scope 5141 // in C, note that this type can only be used within the function. 5142 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 5143 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 5144 5145 // Set the lexical context. If the tag has a C++ scope specifier, the 5146 // lexical context will be different from the semantic context. 5147 New->setLexicalDeclContext(CurContext); 5148 5149 // Mark this as a friend decl if applicable. 5150 if (TUK == TUK_Friend) 5151 New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ !Previous.empty()); 5152 5153 // Set the access specifier. 5154 if (!Invalid && SearchDC->isRecord()) 5155 SetMemberAccessSpecifier(New, PrevDecl, AS); 5156 5157 if (TUK == TUK_Definition) 5158 New->startDefinition(); 5159 5160 // If this has an identifier, add it to the scope stack. 5161 if (TUK == TUK_Friend) { 5162 // We might be replacing an existing declaration in the lookup tables; 5163 // if so, borrow its access specifier. 5164 if (PrevDecl) 5165 New->setAccess(PrevDecl->getAccess()); 5166 5167 DeclContext *DC = New->getDeclContext()->getLookupContext(); 5168 DC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 5169 if (Name) // can be null along some error paths 5170 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 5171 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false); 5172 } else if (Name) { 5173 S = getNonFieldDeclScope(S); 5174 PushOnScopeChains(New, S); 5175 } else { 5176 CurContext->addDecl(New); 5177 } 5178 5179 // If this is the C FILE type, notify the AST context. 5180 if (IdentifierInfo *II = New->getIdentifier()) 5181 if (!New->isInvalidDecl() && 5182 New->getDeclContext()->getLookupContext()->isTranslationUnit() && 5183 II->isStr("FILE")) 5184 Context.setFILEDecl(New); 5185 5186 OwnedDecl = true; 5187 return DeclPtrTy::make(New); 5188} 5189 5190void Sema::ActOnTagStartDefinition(Scope *S, DeclPtrTy TagD) { 5191 AdjustDeclIfTemplate(TagD); 5192 TagDecl *Tag = cast<TagDecl>(TagD.getAs<Decl>()); 5193 5194 // Enter the tag context. 5195 PushDeclContext(S, Tag); 5196} 5197 5198void Sema::ActOnStartCXXMemberDeclarations(Scope *S, DeclPtrTy TagD, 5199 SourceLocation LBraceLoc) { 5200 AdjustDeclIfTemplate(TagD); 5201 CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD.getAs<Decl>()); 5202 5203 FieldCollector->StartClass(); 5204 5205 if (!Record->getIdentifier()) 5206 return; 5207 5208 // C++ [class]p2: 5209 // [...] The class-name is also inserted into the scope of the 5210 // class itself; this is known as the injected-class-name. For 5211 // purposes of access checking, the injected-class-name is treated 5212 // as if it were a public member name. 5213 CXXRecordDecl *InjectedClassName 5214 = CXXRecordDecl::Create(Context, Record->getTagKind(), 5215 CurContext, Record->getLocation(), 5216 Record->getIdentifier(), 5217 Record->getTagKeywordLoc(), 5218 Record); 5219 InjectedClassName->setImplicit(); 5220 InjectedClassName->setAccess(AS_public); 5221 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 5222 InjectedClassName->setDescribedClassTemplate(Template); 5223 PushOnScopeChains(InjectedClassName, S); 5224 assert(InjectedClassName->isInjectedClassName() && 5225 "Broken injected-class-name"); 5226} 5227 5228// Traverses the class and any nested classes, making a note of any 5229// dynamic classes that have no key function so that we can mark all of 5230// their virtual member functions as "used" at the end of the translation 5231// unit. This ensures that all functions needed by the vtable will get 5232// instantiated/synthesized. 5233static void 5234RecordDynamicClassesWithNoKeyFunction(Sema &S, CXXRecordDecl *Record, 5235 SourceLocation Loc) { 5236 // We don't look at dependent or undefined classes. 5237 if (Record->isDependentContext() || !Record->isDefinition()) 5238 return; 5239 5240 if (Record->isDynamicClass()) { 5241 const CXXMethodDecl *KeyFunction = S.Context.getKeyFunction(Record); 5242 5243 if (!KeyFunction) 5244 S.ClassesWithUnmarkedVirtualMembers.push_back(std::make_pair(Record, 5245 Loc)); 5246 5247 if ((!KeyFunction || (KeyFunction->getBody() && KeyFunction->isInlined())) 5248 && Record->getLinkage() == ExternalLinkage) 5249 S.Diag(Record->getLocation(), diag::warn_weak_vtable) << Record; 5250 } 5251 for (DeclContext::decl_iterator D = Record->decls_begin(), 5252 DEnd = Record->decls_end(); 5253 D != DEnd; ++D) { 5254 if (CXXRecordDecl *Nested = dyn_cast<CXXRecordDecl>(*D)) 5255 RecordDynamicClassesWithNoKeyFunction(S, Nested, Loc); 5256 } 5257} 5258 5259void Sema::ActOnTagFinishDefinition(Scope *S, DeclPtrTy TagD, 5260 SourceLocation RBraceLoc) { 5261 AdjustDeclIfTemplate(TagD); 5262 TagDecl *Tag = cast<TagDecl>(TagD.getAs<Decl>()); 5263 Tag->setRBraceLoc(RBraceLoc); 5264 5265 if (isa<CXXRecordDecl>(Tag)) 5266 FieldCollector->FinishClass(); 5267 5268 // Exit this scope of this tag's definition. 5269 PopDeclContext(); 5270 5271 if (isa<CXXRecordDecl>(Tag) && !Tag->getLexicalDeclContext()->isRecord()) 5272 RecordDynamicClassesWithNoKeyFunction(*this, cast<CXXRecordDecl>(Tag), 5273 RBraceLoc); 5274 5275 // Notify the consumer that we've defined a tag. 5276 Consumer.HandleTagDeclDefinition(Tag); 5277} 5278 5279void Sema::ActOnTagDefinitionError(Scope *S, DeclPtrTy TagD) { 5280 AdjustDeclIfTemplate(TagD); 5281 TagDecl *Tag = cast<TagDecl>(TagD.getAs<Decl>()); 5282 Tag->setInvalidDecl(); 5283 5284 // We're undoing ActOnTagStartDefinition here, not 5285 // ActOnStartCXXMemberDeclarations, so we don't have to mess with 5286 // the FieldCollector. 5287 5288 PopDeclContext(); 5289} 5290 5291// Note that FieldName may be null for anonymous bitfields. 5292bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName, 5293 QualType FieldTy, const Expr *BitWidth, 5294 bool *ZeroWidth) { 5295 // Default to true; that shouldn't confuse checks for emptiness 5296 if (ZeroWidth) 5297 *ZeroWidth = true; 5298 5299 // C99 6.7.2.1p4 - verify the field type. 5300 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 5301 if (!FieldTy->isDependentType() && !FieldTy->isIntegralType()) { 5302 // Handle incomplete types with specific error. 5303 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 5304 return true; 5305 if (FieldName) 5306 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 5307 << FieldName << FieldTy << BitWidth->getSourceRange(); 5308 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) 5309 << FieldTy << BitWidth->getSourceRange(); 5310 } 5311 5312 // If the bit-width is type- or value-dependent, don't try to check 5313 // it now. 5314 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 5315 return false; 5316 5317 llvm::APSInt Value; 5318 if (VerifyIntegerConstantExpression(BitWidth, &Value)) 5319 return true; 5320 5321 if (Value != 0 && ZeroWidth) 5322 *ZeroWidth = false; 5323 5324 // Zero-width bitfield is ok for anonymous field. 5325 if (Value == 0 && FieldName) 5326 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 5327 5328 if (Value.isSigned() && Value.isNegative()) { 5329 if (FieldName) 5330 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 5331 << FieldName << Value.toString(10); 5332 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) 5333 << Value.toString(10); 5334 } 5335 5336 if (!FieldTy->isDependentType()) { 5337 uint64_t TypeSize = Context.getTypeSize(FieldTy); 5338 if (Value.getZExtValue() > TypeSize) { 5339 if (FieldName) 5340 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 5341 << FieldName << (unsigned)TypeSize; 5342 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) 5343 << (unsigned)TypeSize; 5344 } 5345 } 5346 5347 return false; 5348} 5349 5350/// ActOnField - Each field of a struct/union/class is passed into this in order 5351/// to create a FieldDecl object for it. 5352Sema::DeclPtrTy Sema::ActOnField(Scope *S, DeclPtrTy TagD, 5353 SourceLocation DeclStart, 5354 Declarator &D, ExprTy *BitfieldWidth) { 5355 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD.getAs<Decl>()), 5356 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 5357 AS_public); 5358 return DeclPtrTy::make(Res); 5359} 5360 5361/// HandleField - Analyze a field of a C struct or a C++ data member. 5362/// 5363FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 5364 SourceLocation DeclStart, 5365 Declarator &D, Expr *BitWidth, 5366 AccessSpecifier AS) { 5367 IdentifierInfo *II = D.getIdentifier(); 5368 SourceLocation Loc = DeclStart; 5369 if (II) Loc = D.getIdentifierLoc(); 5370 5371 TypeSourceInfo *TInfo = 0; 5372 QualType T = GetTypeForDeclarator(D, S, &TInfo); 5373 if (getLangOptions().CPlusPlus) 5374 CheckExtraCXXDefaultArguments(D); 5375 5376 DiagnoseFunctionSpecifiers(D); 5377 5378 if (D.getDeclSpec().isThreadSpecified()) 5379 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 5380 5381 NamedDecl *PrevDecl = LookupSingleName(S, II, LookupMemberName, 5382 ForRedeclaration); 5383 5384 if (PrevDecl && PrevDecl->isTemplateParameter()) { 5385 // Maybe we will complain about the shadowed template parameter. 5386 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 5387 // Just pretend that we didn't see the previous declaration. 5388 PrevDecl = 0; 5389 } 5390 5391 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 5392 PrevDecl = 0; 5393 5394 bool Mutable 5395 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable); 5396 SourceLocation TSSL = D.getSourceRange().getBegin(); 5397 FieldDecl *NewFD 5398 = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, TSSL, 5399 AS, PrevDecl, &D); 5400 5401 if (NewFD->isInvalidDecl()) 5402 Record->setInvalidDecl(); 5403 5404 if (NewFD->isInvalidDecl() && PrevDecl) { 5405 // Don't introduce NewFD into scope; there's already something 5406 // with the same name in the same scope. 5407 } else if (II) { 5408 PushOnScopeChains(NewFD, S); 5409 } else 5410 Record->addDecl(NewFD); 5411 5412 return NewFD; 5413} 5414 5415/// \brief Build a new FieldDecl and check its well-formedness. 5416/// 5417/// This routine builds a new FieldDecl given the fields name, type, 5418/// record, etc. \p PrevDecl should refer to any previous declaration 5419/// with the same name and in the same scope as the field to be 5420/// created. 5421/// 5422/// \returns a new FieldDecl. 5423/// 5424/// \todo The Declarator argument is a hack. It will be removed once 5425FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 5426 TypeSourceInfo *TInfo, 5427 RecordDecl *Record, SourceLocation Loc, 5428 bool Mutable, Expr *BitWidth, 5429 SourceLocation TSSL, 5430 AccessSpecifier AS, NamedDecl *PrevDecl, 5431 Declarator *D) { 5432 IdentifierInfo *II = Name.getAsIdentifierInfo(); 5433 bool InvalidDecl = false; 5434 if (D) InvalidDecl = D->isInvalidType(); 5435 5436 // If we receive a broken type, recover by assuming 'int' and 5437 // marking this declaration as invalid. 5438 if (T.isNull()) { 5439 InvalidDecl = true; 5440 T = Context.IntTy; 5441 } 5442 5443 QualType EltTy = Context.getBaseElementType(T); 5444 if (!EltTy->isDependentType() && 5445 RequireCompleteType(Loc, EltTy, diag::err_field_incomplete)) 5446 InvalidDecl = true; 5447 5448 // C99 6.7.2.1p8: A member of a structure or union may have any type other 5449 // than a variably modified type. 5450 if (!InvalidDecl && T->isVariablyModifiedType()) { 5451 bool SizeIsNegative; 5452 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 5453 SizeIsNegative); 5454 if (!FixedTy.isNull()) { 5455 Diag(Loc, diag::warn_illegal_constant_array_size); 5456 T = FixedTy; 5457 } else { 5458 if (SizeIsNegative) 5459 Diag(Loc, diag::err_typecheck_negative_array_size); 5460 else 5461 Diag(Loc, diag::err_typecheck_field_variable_size); 5462 InvalidDecl = true; 5463 } 5464 } 5465 5466 // Fields can not have abstract class types 5467 if (!InvalidDecl && RequireNonAbstractType(Loc, T, 5468 diag::err_abstract_type_in_decl, 5469 AbstractFieldType)) 5470 InvalidDecl = true; 5471 5472 bool ZeroWidth = false; 5473 // If this is declared as a bit-field, check the bit-field. 5474 if (!InvalidDecl && BitWidth && 5475 VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth)) { 5476 InvalidDecl = true; 5477 DeleteExpr(BitWidth); 5478 BitWidth = 0; 5479 ZeroWidth = false; 5480 } 5481 5482 FieldDecl *NewFD = FieldDecl::Create(Context, Record, Loc, II, T, TInfo, 5483 BitWidth, Mutable); 5484 if (InvalidDecl) 5485 NewFD->setInvalidDecl(); 5486 5487 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 5488 Diag(Loc, diag::err_duplicate_member) << II; 5489 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 5490 NewFD->setInvalidDecl(); 5491 } 5492 5493 if (!InvalidDecl && getLangOptions().CPlusPlus) { 5494 CXXRecordDecl* CXXRecord = cast<CXXRecordDecl>(Record); 5495 5496 if (!T->isPODType()) 5497 CXXRecord->setPOD(false); 5498 if (!ZeroWidth) 5499 CXXRecord->setEmpty(false); 5500 5501 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 5502 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 5503 5504 if (!RDecl->hasTrivialConstructor()) 5505 CXXRecord->setHasTrivialConstructor(false); 5506 if (!RDecl->hasTrivialCopyConstructor()) 5507 CXXRecord->setHasTrivialCopyConstructor(false); 5508 if (!RDecl->hasTrivialCopyAssignment()) 5509 CXXRecord->setHasTrivialCopyAssignment(false); 5510 if (!RDecl->hasTrivialDestructor()) 5511 CXXRecord->setHasTrivialDestructor(false); 5512 5513 // C++ 9.5p1: An object of a class with a non-trivial 5514 // constructor, a non-trivial copy constructor, a non-trivial 5515 // destructor, or a non-trivial copy assignment operator 5516 // cannot be a member of a union, nor can an array of such 5517 // objects. 5518 // TODO: C++0x alters this restriction significantly. 5519 if (Record->isUnion()) { 5520 // We check for copy constructors before constructors 5521 // because otherwise we'll never get complaints about 5522 // copy constructors. 5523 5524 const CXXSpecialMember invalid = (CXXSpecialMember) -1; 5525 5526 CXXSpecialMember member; 5527 if (!RDecl->hasTrivialCopyConstructor()) 5528 member = CXXCopyConstructor; 5529 else if (!RDecl->hasTrivialConstructor()) 5530 member = CXXDefaultConstructor; 5531 else if (!RDecl->hasTrivialCopyAssignment()) 5532 member = CXXCopyAssignment; 5533 else if (!RDecl->hasTrivialDestructor()) 5534 member = CXXDestructor; 5535 else 5536 member = invalid; 5537 5538 if (member != invalid) { 5539 Diag(Loc, diag::err_illegal_union_member) << Name << member; 5540 DiagnoseNontrivial(RT, member); 5541 NewFD->setInvalidDecl(); 5542 } 5543 } 5544 } 5545 } 5546 5547 // FIXME: We need to pass in the attributes given an AST 5548 // representation, not a parser representation. 5549 if (D) 5550 // FIXME: What to pass instead of TUScope? 5551 ProcessDeclAttributes(TUScope, NewFD, *D); 5552 5553 if (T.isObjCGCWeak()) 5554 Diag(Loc, diag::warn_attribute_weak_on_field); 5555 5556 NewFD->setAccess(AS); 5557 5558 // C++ [dcl.init.aggr]p1: 5559 // An aggregate is an array or a class (clause 9) with [...] no 5560 // private or protected non-static data members (clause 11). 5561 // A POD must be an aggregate. 5562 if (getLangOptions().CPlusPlus && 5563 (AS == AS_private || AS == AS_protected)) { 5564 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record); 5565 CXXRecord->setAggregate(false); 5566 CXXRecord->setPOD(false); 5567 } 5568 5569 return NewFD; 5570} 5571 5572/// DiagnoseNontrivial - Given that a class has a non-trivial 5573/// special member, figure out why. 5574void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) { 5575 QualType QT(T, 0U); 5576 CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl()); 5577 5578 // Check whether the member was user-declared. 5579 switch (member) { 5580 case CXXDefaultConstructor: 5581 if (RD->hasUserDeclaredConstructor()) { 5582 typedef CXXRecordDecl::ctor_iterator ctor_iter; 5583 for (ctor_iter ci = RD->ctor_begin(), ce = RD->ctor_end(); ci != ce;++ci){ 5584 const FunctionDecl *body = 0; 5585 ci->getBody(body); 5586 if (!body || 5587 !cast<CXXConstructorDecl>(body)->isImplicitlyDefined(Context)) { 5588 SourceLocation CtorLoc = ci->getLocation(); 5589 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 5590 return; 5591 } 5592 } 5593 5594 assert(0 && "found no user-declared constructors"); 5595 return; 5596 } 5597 break; 5598 5599 case CXXCopyConstructor: 5600 if (RD->hasUserDeclaredCopyConstructor()) { 5601 SourceLocation CtorLoc = 5602 RD->getCopyConstructor(Context, 0)->getLocation(); 5603 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 5604 return; 5605 } 5606 break; 5607 5608 case CXXCopyAssignment: 5609 if (RD->hasUserDeclaredCopyAssignment()) { 5610 // FIXME: this should use the location of the copy 5611 // assignment, not the type. 5612 SourceLocation TyLoc = RD->getSourceRange().getBegin(); 5613 Diag(TyLoc, diag::note_nontrivial_user_defined) << QT << member; 5614 return; 5615 } 5616 break; 5617 5618 case CXXDestructor: 5619 if (RD->hasUserDeclaredDestructor()) { 5620 SourceLocation DtorLoc = RD->getDestructor(Context)->getLocation(); 5621 Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member; 5622 return; 5623 } 5624 break; 5625 } 5626 5627 typedef CXXRecordDecl::base_class_iterator base_iter; 5628 5629 // Virtual bases and members inhibit trivial copying/construction, 5630 // but not trivial destruction. 5631 if (member != CXXDestructor) { 5632 // Check for virtual bases. vbases includes indirect virtual bases, 5633 // so we just iterate through the direct bases. 5634 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) 5635 if (bi->isVirtual()) { 5636 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 5637 Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1; 5638 return; 5639 } 5640 5641 // Check for virtual methods. 5642 typedef CXXRecordDecl::method_iterator meth_iter; 5643 for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me; 5644 ++mi) { 5645 if (mi->isVirtual()) { 5646 SourceLocation MLoc = mi->getSourceRange().getBegin(); 5647 Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0; 5648 return; 5649 } 5650 } 5651 } 5652 5653 bool (CXXRecordDecl::*hasTrivial)() const; 5654 switch (member) { 5655 case CXXDefaultConstructor: 5656 hasTrivial = &CXXRecordDecl::hasTrivialConstructor; break; 5657 case CXXCopyConstructor: 5658 hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break; 5659 case CXXCopyAssignment: 5660 hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break; 5661 case CXXDestructor: 5662 hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break; 5663 default: 5664 assert(0 && "unexpected special member"); return; 5665 } 5666 5667 // Check for nontrivial bases (and recurse). 5668 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) { 5669 const RecordType *BaseRT = bi->getType()->getAs<RecordType>(); 5670 assert(BaseRT && "Don't know how to handle dependent bases"); 5671 CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl()); 5672 if (!(BaseRecTy->*hasTrivial)()) { 5673 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 5674 Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member; 5675 DiagnoseNontrivial(BaseRT, member); 5676 return; 5677 } 5678 } 5679 5680 // Check for nontrivial members (and recurse). 5681 typedef RecordDecl::field_iterator field_iter; 5682 for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe; 5683 ++fi) { 5684 QualType EltTy = Context.getBaseElementType((*fi)->getType()); 5685 if (const RecordType *EltRT = EltTy->getAs<RecordType>()) { 5686 CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl()); 5687 5688 if (!(EltRD->*hasTrivial)()) { 5689 SourceLocation FLoc = (*fi)->getLocation(); 5690 Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member; 5691 DiagnoseNontrivial(EltRT, member); 5692 return; 5693 } 5694 } 5695 } 5696 5697 assert(0 && "found no explanation for non-trivial member"); 5698} 5699 5700/// TranslateIvarVisibility - Translate visibility from a token ID to an 5701/// AST enum value. 5702static ObjCIvarDecl::AccessControl 5703TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 5704 switch (ivarVisibility) { 5705 default: assert(0 && "Unknown visitibility kind"); 5706 case tok::objc_private: return ObjCIvarDecl::Private; 5707 case tok::objc_public: return ObjCIvarDecl::Public; 5708 case tok::objc_protected: return ObjCIvarDecl::Protected; 5709 case tok::objc_package: return ObjCIvarDecl::Package; 5710 } 5711} 5712 5713/// ActOnIvar - Each ivar field of an objective-c class is passed into this 5714/// in order to create an IvarDecl object for it. 5715Sema::DeclPtrTy Sema::ActOnIvar(Scope *S, 5716 SourceLocation DeclStart, 5717 DeclPtrTy IntfDecl, 5718 Declarator &D, ExprTy *BitfieldWidth, 5719 tok::ObjCKeywordKind Visibility) { 5720 5721 IdentifierInfo *II = D.getIdentifier(); 5722 Expr *BitWidth = (Expr*)BitfieldWidth; 5723 SourceLocation Loc = DeclStart; 5724 if (II) Loc = D.getIdentifierLoc(); 5725 5726 // FIXME: Unnamed fields can be handled in various different ways, for 5727 // example, unnamed unions inject all members into the struct namespace! 5728 5729 TypeSourceInfo *TInfo = 0; 5730 QualType T = GetTypeForDeclarator(D, S, &TInfo); 5731 5732 if (BitWidth) { 5733 // 6.7.2.1p3, 6.7.2.1p4 5734 if (VerifyBitField(Loc, II, T, BitWidth)) { 5735 D.setInvalidType(); 5736 DeleteExpr(BitWidth); 5737 BitWidth = 0; 5738 } 5739 } else { 5740 // Not a bitfield. 5741 5742 // validate II. 5743 5744 } 5745 5746 // C99 6.7.2.1p8: A member of a structure or union may have any type other 5747 // than a variably modified type. 5748 if (T->isVariablyModifiedType()) { 5749 Diag(Loc, diag::err_typecheck_ivar_variable_size); 5750 D.setInvalidType(); 5751 } 5752 5753 // Get the visibility (access control) for this ivar. 5754 ObjCIvarDecl::AccessControl ac = 5755 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 5756 : ObjCIvarDecl::None; 5757 // Must set ivar's DeclContext to its enclosing interface. 5758 ObjCContainerDecl *EnclosingDecl = IntfDecl.getAs<ObjCContainerDecl>(); 5759 ObjCContainerDecl *EnclosingContext; 5760 if (ObjCImplementationDecl *IMPDecl = 5761 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 5762 // Case of ivar declared in an implementation. Context is that of its class. 5763 EnclosingContext = IMPDecl->getClassInterface(); 5764 assert(EnclosingContext && "Implementation has no class interface!"); 5765 } else { 5766 if (ObjCCategoryDecl *CDecl = 5767 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 5768 if (!LangOpts.ObjCNonFragileABI2 || !CDecl->IsClassExtension()) { 5769 Diag(Loc, diag::err_misplaced_ivar) << CDecl->IsClassExtension(); 5770 return DeclPtrTy(); 5771 } 5772 } 5773 EnclosingContext = EnclosingDecl; 5774 } 5775 5776 // Construct the decl. 5777 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, 5778 EnclosingContext, Loc, II, T, 5779 TInfo, ac, (Expr *)BitfieldWidth); 5780 5781 if (II) { 5782 NamedDecl *PrevDecl = LookupSingleName(S, II, LookupMemberName, 5783 ForRedeclaration); 5784 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S) 5785 && !isa<TagDecl>(PrevDecl)) { 5786 Diag(Loc, diag::err_duplicate_member) << II; 5787 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 5788 NewID->setInvalidDecl(); 5789 } 5790 } 5791 5792 // Process attributes attached to the ivar. 5793 ProcessDeclAttributes(S, NewID, D); 5794 5795 if (D.isInvalidType()) 5796 NewID->setInvalidDecl(); 5797 5798 if (II) { 5799 // FIXME: When interfaces are DeclContexts, we'll need to add 5800 // these to the interface. 5801 S->AddDecl(DeclPtrTy::make(NewID)); 5802 IdResolver.AddDecl(NewID); 5803 } 5804 5805 return DeclPtrTy::make(NewID); 5806} 5807 5808void Sema::ActOnFields(Scope* S, 5809 SourceLocation RecLoc, DeclPtrTy RecDecl, 5810 DeclPtrTy *Fields, unsigned NumFields, 5811 SourceLocation LBrac, SourceLocation RBrac, 5812 AttributeList *Attr) { 5813 Decl *EnclosingDecl = RecDecl.getAs<Decl>(); 5814 assert(EnclosingDecl && "missing record or interface decl"); 5815 5816 // If the decl this is being inserted into is invalid, then it may be a 5817 // redeclaration or some other bogus case. Don't try to add fields to it. 5818 if (EnclosingDecl->isInvalidDecl()) { 5819 // FIXME: Deallocate fields? 5820 return; 5821 } 5822 5823 5824 // Verify that all the fields are okay. 5825 unsigned NumNamedMembers = 0; 5826 llvm::SmallVector<FieldDecl*, 32> RecFields; 5827 5828 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 5829 for (unsigned i = 0; i != NumFields; ++i) { 5830 FieldDecl *FD = cast<FieldDecl>(Fields[i].getAs<Decl>()); 5831 5832 // Get the type for the field. 5833 Type *FDTy = FD->getType().getTypePtr(); 5834 5835 if (!FD->isAnonymousStructOrUnion()) { 5836 // Remember all fields written by the user. 5837 RecFields.push_back(FD); 5838 } 5839 5840 // If the field is already invalid for some reason, don't emit more 5841 // diagnostics about it. 5842 if (FD->isInvalidDecl()) { 5843 EnclosingDecl->setInvalidDecl(); 5844 continue; 5845 } 5846 5847 // C99 6.7.2.1p2: 5848 // A structure or union shall not contain a member with 5849 // incomplete or function type (hence, a structure shall not 5850 // contain an instance of itself, but may contain a pointer to 5851 // an instance of itself), except that the last member of a 5852 // structure with more than one named member may have incomplete 5853 // array type; such a structure (and any union containing, 5854 // possibly recursively, a member that is such a structure) 5855 // shall not be a member of a structure or an element of an 5856 // array. 5857 if (FDTy->isFunctionType()) { 5858 // Field declared as a function. 5859 Diag(FD->getLocation(), diag::err_field_declared_as_function) 5860 << FD->getDeclName(); 5861 FD->setInvalidDecl(); 5862 EnclosingDecl->setInvalidDecl(); 5863 continue; 5864 } else if (FDTy->isIncompleteArrayType() && i == NumFields - 1 && 5865 Record && Record->isStruct()) { 5866 // Flexible array member. 5867 if (NumNamedMembers < 1) { 5868 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 5869 << FD->getDeclName(); 5870 FD->setInvalidDecl(); 5871 EnclosingDecl->setInvalidDecl(); 5872 continue; 5873 } 5874 // Okay, we have a legal flexible array member at the end of the struct. 5875 if (Record) 5876 Record->setHasFlexibleArrayMember(true); 5877 } else if (!FDTy->isDependentType() && 5878 RequireCompleteType(FD->getLocation(), FD->getType(), 5879 diag::err_field_incomplete)) { 5880 // Incomplete type 5881 FD->setInvalidDecl(); 5882 EnclosingDecl->setInvalidDecl(); 5883 continue; 5884 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) { 5885 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 5886 // If this is a member of a union, then entire union becomes "flexible". 5887 if (Record && Record->isUnion()) { 5888 Record->setHasFlexibleArrayMember(true); 5889 } else { 5890 // If this is a struct/class and this is not the last element, reject 5891 // it. Note that GCC supports variable sized arrays in the middle of 5892 // structures. 5893 if (i != NumFields-1) 5894 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 5895 << FD->getDeclName() << FD->getType(); 5896 else { 5897 // We support flexible arrays at the end of structs in 5898 // other structs as an extension. 5899 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 5900 << FD->getDeclName(); 5901 if (Record) 5902 Record->setHasFlexibleArrayMember(true); 5903 } 5904 } 5905 } 5906 if (Record && FDTTy->getDecl()->hasObjectMember()) 5907 Record->setHasObjectMember(true); 5908 } else if (FDTy->isObjCInterfaceType()) { 5909 /// A field cannot be an Objective-c object 5910 Diag(FD->getLocation(), diag::err_statically_allocated_object); 5911 FD->setInvalidDecl(); 5912 EnclosingDecl->setInvalidDecl(); 5913 continue; 5914 } else if (getLangOptions().ObjC1 && 5915 getLangOptions().getGCMode() != LangOptions::NonGC && 5916 Record && 5917 (FD->getType()->isObjCObjectPointerType() || 5918 FD->getType().isObjCGCStrong())) 5919 Record->setHasObjectMember(true); 5920 // Keep track of the number of named members. 5921 if (FD->getIdentifier()) 5922 ++NumNamedMembers; 5923 } 5924 5925 // Okay, we successfully defined 'Record'. 5926 if (Record) { 5927 Record->completeDefinition(); 5928 } else { 5929 ObjCIvarDecl **ClsFields = 5930 reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); 5931 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 5932 ID->setLocEnd(RBrac); 5933 // Add ivar's to class's DeclContext. 5934 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 5935 ClsFields[i]->setLexicalDeclContext(ID); 5936 ID->addDecl(ClsFields[i]); 5937 } 5938 // Must enforce the rule that ivars in the base classes may not be 5939 // duplicates. 5940 if (ID->getSuperClass()) 5941 DiagnoseDuplicateIvars(ID, ID->getSuperClass()); 5942 } else if (ObjCImplementationDecl *IMPDecl = 5943 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 5944 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 5945 for (unsigned I = 0, N = RecFields.size(); I != N; ++I) 5946 // Ivar declared in @implementation never belongs to the implementation. 5947 // Only it is in implementation's lexical context. 5948 ClsFields[I]->setLexicalDeclContext(IMPDecl); 5949 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 5950 } else if (ObjCCategoryDecl *CDecl = 5951 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 5952 // case of ivars in class extension; all other cases have been 5953 // reported as errors elsewhere. 5954 // FIXME. Class extension does not have a LocEnd field. 5955 // CDecl->setLocEnd(RBrac); 5956 // Add ivar's to class extension's DeclContext. 5957 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 5958 ClsFields[i]->setLexicalDeclContext(CDecl); 5959 CDecl->addDecl(ClsFields[i]); 5960 } 5961 } 5962 } 5963 5964 if (Attr) 5965 ProcessDeclAttributeList(S, Record, Attr); 5966} 5967 5968/// \brief Determine whether the given integral value is representable within 5969/// the given type T. 5970static bool isRepresentableIntegerValue(ASTContext &Context, 5971 llvm::APSInt &Value, 5972 QualType T) { 5973 assert(T->isIntegralType() && "Integral type required!"); 5974 unsigned BitWidth = Context.getTypeSize(T); 5975 5976 if (Value.isUnsigned() || Value.isNonNegative()) 5977 return Value.getActiveBits() < BitWidth; 5978 5979 return Value.getMinSignedBits() <= BitWidth; 5980} 5981 5982// \brief Given an integral type, return the next larger integral type 5983// (or a NULL type of no such type exists). 5984static QualType getNextLargerIntegralType(ASTContext &Context, QualType T) { 5985 // FIXME: Int128/UInt128 support, which also needs to be introduced into 5986 // enum checking below. 5987 assert(T->isIntegralType() && "Integral type required!"); 5988 const unsigned NumTypes = 4; 5989 QualType SignedIntegralTypes[NumTypes] = { 5990 Context.ShortTy, Context.IntTy, Context.LongTy, Context.LongLongTy 5991 }; 5992 QualType UnsignedIntegralTypes[NumTypes] = { 5993 Context.UnsignedShortTy, Context.UnsignedIntTy, Context.UnsignedLongTy, 5994 Context.UnsignedLongLongTy 5995 }; 5996 5997 unsigned BitWidth = Context.getTypeSize(T); 5998 QualType *Types = T->isSignedIntegerType()? SignedIntegralTypes 5999 : UnsignedIntegralTypes; 6000 for (unsigned I = 0; I != NumTypes; ++I) 6001 if (Context.getTypeSize(Types[I]) > BitWidth) 6002 return Types[I]; 6003 6004 return QualType(); 6005} 6006 6007EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 6008 EnumConstantDecl *LastEnumConst, 6009 SourceLocation IdLoc, 6010 IdentifierInfo *Id, 6011 ExprArg val) { 6012 Expr *Val = (Expr *)val.get(); 6013 6014 unsigned IntWidth = Context.Target.getIntWidth(); 6015 llvm::APSInt EnumVal(IntWidth); 6016 QualType EltTy; 6017 if (Val) { 6018 if (Enum->isDependentType() || Val->isTypeDependent()) 6019 EltTy = Context.DependentTy; 6020 else { 6021 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 6022 SourceLocation ExpLoc; 6023 if (!Val->isValueDependent() && 6024 VerifyIntegerConstantExpression(Val, &EnumVal)) { 6025 Val = 0; 6026 } else { 6027 if (!getLangOptions().CPlusPlus) { 6028 // C99 6.7.2.2p2: 6029 // The expression that defines the value of an enumeration constant 6030 // shall be an integer constant expression that has a value 6031 // representable as an int. 6032 6033 // Complain if the value is not representable in an int. 6034 if (!isRepresentableIntegerValue(Context, EnumVal, Context.IntTy)) 6035 Diag(IdLoc, diag::ext_enum_value_not_int) 6036 << EnumVal.toString(10) << Val->getSourceRange() 6037 << (EnumVal.isUnsigned() || EnumVal.isNonNegative()); 6038 else if (!Context.hasSameType(Val->getType(), Context.IntTy)) { 6039 // Force the type of the expression to 'int'. 6040 ImpCastExprToType(Val, Context.IntTy, CastExpr::CK_IntegralCast); 6041 6042 if (Val != val.get()) { 6043 val.release(); 6044 val = Val; 6045 } 6046 } 6047 } 6048 6049 // C++0x [dcl.enum]p5: 6050 // If the underlying type is not fixed, the type of each enumerator 6051 // is the type of its initializing value: 6052 // - If an initializer is specified for an enumerator, the 6053 // initializing value has the same type as the expression. 6054 EltTy = Val->getType(); 6055 } 6056 } 6057 } 6058 6059 if (!Val) { 6060 if (Enum->isDependentType()) 6061 EltTy = Context.DependentTy; 6062 else if (!LastEnumConst) { 6063 // C++0x [dcl.enum]p5: 6064 // If the underlying type is not fixed, the type of each enumerator 6065 // is the type of its initializing value: 6066 // - If no initializer is specified for the first enumerator, the 6067 // initializing value has an unspecified integral type. 6068 // 6069 // GCC uses 'int' for its unspecified integral type, as does 6070 // C99 6.7.2.2p3. 6071 EltTy = Context.IntTy; 6072 } else { 6073 // Assign the last value + 1. 6074 EnumVal = LastEnumConst->getInitVal(); 6075 ++EnumVal; 6076 EltTy = LastEnumConst->getType(); 6077 6078 // Check for overflow on increment. 6079 if (EnumVal < LastEnumConst->getInitVal()) { 6080 // C++0x [dcl.enum]p5: 6081 // If the underlying type is not fixed, the type of each enumerator 6082 // is the type of its initializing value: 6083 // 6084 // - Otherwise the type of the initializing value is the same as 6085 // the type of the initializing value of the preceding enumerator 6086 // unless the incremented value is not representable in that type, 6087 // in which case the type is an unspecified integral type 6088 // sufficient to contain the incremented value. If no such type 6089 // exists, the program is ill-formed. 6090 QualType T = getNextLargerIntegralType(Context, EltTy); 6091 if (T.isNull()) { 6092 // There is no integral type larger enough to represent this 6093 // value. Complain, then allow the value to wrap around. 6094 EnumVal = LastEnumConst->getInitVal(); 6095 EnumVal.zext(EnumVal.getBitWidth() * 2); 6096 Diag(IdLoc, diag::warn_enumerator_too_large) 6097 << EnumVal.toString(10); 6098 } else { 6099 EltTy = T; 6100 } 6101 6102 // Retrieve the last enumerator's value, extent that type to the 6103 // type that is supposed to be large enough to represent the incremented 6104 // value, then increment. 6105 EnumVal = LastEnumConst->getInitVal(); 6106 EnumVal.setIsSigned(EltTy->isSignedIntegerType()); 6107 EnumVal.zextOrTrunc(Context.getTypeSize(EltTy)); 6108 ++EnumVal; 6109 6110 // If we're not in C++, diagnose the overflow of enumerator values, 6111 // which in C99 means that the enumerator value is not representable in 6112 // an int (C99 6.7.2.2p2). However, we support GCC's extension that 6113 // permits enumerator values that are representable in some larger 6114 // integral type. 6115 if (!getLangOptions().CPlusPlus && !T.isNull()) 6116 Diag(IdLoc, diag::warn_enum_value_overflow); 6117 } else if (!getLangOptions().CPlusPlus && 6118 !isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 6119 // Enforce C99 6.7.2.2p2 even when we compute the next value. 6120 Diag(IdLoc, diag::ext_enum_value_not_int) 6121 << EnumVal.toString(10) << 1; 6122 } 6123 } 6124 } 6125 6126 if (!EltTy->isDependentType()) { 6127 // Make the enumerator value match the signedness and size of the 6128 // enumerator's type. 6129 EnumVal.zextOrTrunc(Context.getTypeSize(EltTy)); 6130 EnumVal.setIsSigned(EltTy->isSignedIntegerType()); 6131 } 6132 6133 val.release(); 6134 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 6135 Val, EnumVal); 6136} 6137 6138 6139Sema::DeclPtrTy Sema::ActOnEnumConstant(Scope *S, DeclPtrTy theEnumDecl, 6140 DeclPtrTy lastEnumConst, 6141 SourceLocation IdLoc, 6142 IdentifierInfo *Id, 6143 SourceLocation EqualLoc, ExprTy *val) { 6144 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl.getAs<Decl>()); 6145 EnumConstantDecl *LastEnumConst = 6146 cast_or_null<EnumConstantDecl>(lastEnumConst.getAs<Decl>()); 6147 Expr *Val = static_cast<Expr*>(val); 6148 6149 // The scope passed in may not be a decl scope. Zip up the scope tree until 6150 // we find one that is. 6151 S = getNonFieldDeclScope(S); 6152 6153 // Verify that there isn't already something declared with this name in this 6154 // scope. 6155 NamedDecl *PrevDecl = LookupSingleName(S, Id, LookupOrdinaryName, 6156 ForRedeclaration); 6157 if (PrevDecl && PrevDecl->isTemplateParameter()) { 6158 // Maybe we will complain about the shadowed template parameter. 6159 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 6160 // Just pretend that we didn't see the previous declaration. 6161 PrevDecl = 0; 6162 } 6163 6164 if (PrevDecl) { 6165 // When in C++, we may get a TagDecl with the same name; in this case the 6166 // enum constant will 'hide' the tag. 6167 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 6168 "Received TagDecl when not in C++!"); 6169 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 6170 if (isa<EnumConstantDecl>(PrevDecl)) 6171 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 6172 else 6173 Diag(IdLoc, diag::err_redefinition) << Id; 6174 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 6175 if (Val) Val->Destroy(Context); 6176 return DeclPtrTy(); 6177 } 6178 } 6179 6180 EnumConstantDecl *New = CheckEnumConstant(TheEnumDecl, LastEnumConst, 6181 IdLoc, Id, Owned(Val)); 6182 6183 // Register this decl in the current scope stack. 6184 if (New) { 6185 New->setAccess(TheEnumDecl->getAccess()); 6186 PushOnScopeChains(New, S); 6187 } 6188 6189 return DeclPtrTy::make(New); 6190} 6191 6192void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc, 6193 SourceLocation RBraceLoc, DeclPtrTy EnumDeclX, 6194 DeclPtrTy *Elements, unsigned NumElements, 6195 Scope *S, AttributeList *Attr) { 6196 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX.getAs<Decl>()); 6197 QualType EnumType = Context.getTypeDeclType(Enum); 6198 6199 if (Attr) 6200 ProcessDeclAttributeList(S, Enum, Attr); 6201 6202 if (Enum->isDependentType()) { 6203 for (unsigned i = 0; i != NumElements; ++i) { 6204 EnumConstantDecl *ECD = 6205 cast_or_null<EnumConstantDecl>(Elements[i].getAs<Decl>()); 6206 if (!ECD) continue; 6207 6208 ECD->setType(EnumType); 6209 } 6210 6211 Enum->completeDefinition(Context.DependentTy, Context.DependentTy); 6212 return; 6213 } 6214 6215 // TODO: If the result value doesn't fit in an int, it must be a long or long 6216 // long value. ISO C does not support this, but GCC does as an extension, 6217 // emit a warning. 6218 unsigned IntWidth = Context.Target.getIntWidth(); 6219 unsigned CharWidth = Context.Target.getCharWidth(); 6220 unsigned ShortWidth = Context.Target.getShortWidth(); 6221 6222 // Verify that all the values are okay, compute the size of the values, and 6223 // reverse the list. 6224 unsigned NumNegativeBits = 0; 6225 unsigned NumPositiveBits = 0; 6226 6227 // Keep track of whether all elements have type int. 6228 bool AllElementsInt = true; 6229 6230 for (unsigned i = 0; i != NumElements; ++i) { 6231 EnumConstantDecl *ECD = 6232 cast_or_null<EnumConstantDecl>(Elements[i].getAs<Decl>()); 6233 if (!ECD) continue; // Already issued a diagnostic. 6234 6235 const llvm::APSInt &InitVal = ECD->getInitVal(); 6236 6237 // Keep track of the size of positive and negative values. 6238 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 6239 NumPositiveBits = std::max(NumPositiveBits, 6240 (unsigned)InitVal.getActiveBits()); 6241 else 6242 NumNegativeBits = std::max(NumNegativeBits, 6243 (unsigned)InitVal.getMinSignedBits()); 6244 6245 // Keep track of whether every enum element has type int (very commmon). 6246 if (AllElementsInt) 6247 AllElementsInt = ECD->getType() == Context.IntTy; 6248 } 6249 6250 // Figure out the type that should be used for this enum. 6251 // FIXME: Support -fshort-enums. 6252 QualType BestType; 6253 unsigned BestWidth; 6254 6255 // C++0x N3000 [conv.prom]p3: 6256 // An rvalue of an unscoped enumeration type whose underlying 6257 // type is not fixed can be converted to an rvalue of the first 6258 // of the following types that can represent all the values of 6259 // the enumeration: int, unsigned int, long int, unsigned long 6260 // int, long long int, or unsigned long long int. 6261 // C99 6.4.4.3p2: 6262 // An identifier declared as an enumeration constant has type int. 6263 // The C99 rule is modified by a gcc extension 6264 QualType BestPromotionType; 6265 6266 bool Packed = Enum->getAttr<PackedAttr>() ? true : false; 6267 6268 if (NumNegativeBits) { 6269 // If there is a negative value, figure out the smallest integer type (of 6270 // int/long/longlong) that fits. 6271 // If it's packed, check also if it fits a char or a short. 6272 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) { 6273 BestType = Context.SignedCharTy; 6274 BestWidth = CharWidth; 6275 } else if (Packed && NumNegativeBits <= ShortWidth && 6276 NumPositiveBits < ShortWidth) { 6277 BestType = Context.ShortTy; 6278 BestWidth = ShortWidth; 6279 } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 6280 BestType = Context.IntTy; 6281 BestWidth = IntWidth; 6282 } else { 6283 BestWidth = Context.Target.getLongWidth(); 6284 6285 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) { 6286 BestType = Context.LongTy; 6287 } else { 6288 BestWidth = Context.Target.getLongLongWidth(); 6289 6290 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 6291 Diag(Enum->getLocation(), diag::warn_enum_too_large); 6292 BestType = Context.LongLongTy; 6293 } 6294 } 6295 BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType); 6296 } else { 6297 // If there is no negative value, figure out the smallest type that fits 6298 // all of the enumerator values. 6299 // If it's packed, check also if it fits a char or a short. 6300 if (Packed && NumPositiveBits <= CharWidth) { 6301 BestType = Context.UnsignedCharTy; 6302 BestPromotionType = Context.IntTy; 6303 BestWidth = CharWidth; 6304 } else if (Packed && NumPositiveBits <= ShortWidth) { 6305 BestType = Context.UnsignedShortTy; 6306 BestPromotionType = Context.IntTy; 6307 BestWidth = ShortWidth; 6308 } else if (NumPositiveBits <= IntWidth) { 6309 BestType = Context.UnsignedIntTy; 6310 BestWidth = IntWidth; 6311 BestPromotionType 6312 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 6313 ? Context.UnsignedIntTy : Context.IntTy; 6314 } else if (NumPositiveBits <= 6315 (BestWidth = Context.Target.getLongWidth())) { 6316 BestType = Context.UnsignedLongTy; 6317 BestPromotionType 6318 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 6319 ? Context.UnsignedLongTy : Context.LongTy; 6320 } else { 6321 BestWidth = Context.Target.getLongLongWidth(); 6322 assert(NumPositiveBits <= BestWidth && 6323 "How could an initializer get larger than ULL?"); 6324 BestType = Context.UnsignedLongLongTy; 6325 BestPromotionType 6326 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 6327 ? Context.UnsignedLongLongTy : Context.LongLongTy; 6328 } 6329 } 6330 6331 // Loop over all of the enumerator constants, changing their types to match 6332 // the type of the enum if needed. 6333 for (unsigned i = 0; i != NumElements; ++i) { 6334 EnumConstantDecl *ECD = 6335 cast_or_null<EnumConstantDecl>(Elements[i].getAs<Decl>()); 6336 if (!ECD) continue; // Already issued a diagnostic. 6337 6338 // Standard C says the enumerators have int type, but we allow, as an 6339 // extension, the enumerators to be larger than int size. If each 6340 // enumerator value fits in an int, type it as an int, otherwise type it the 6341 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 6342 // that X has type 'int', not 'unsigned'. 6343 6344 // Determine whether the value fits into an int. 6345 llvm::APSInt InitVal = ECD->getInitVal(); 6346 6347 // If it fits into an integer type, force it. Otherwise force it to match 6348 // the enum decl type. 6349 QualType NewTy; 6350 unsigned NewWidth; 6351 bool NewSign; 6352 if (!getLangOptions().CPlusPlus && 6353 isRepresentableIntegerValue(Context, InitVal, Context.IntTy)) { 6354 NewTy = Context.IntTy; 6355 NewWidth = IntWidth; 6356 NewSign = true; 6357 } else if (ECD->getType() == BestType) { 6358 // Already the right type! 6359 if (getLangOptions().CPlusPlus) 6360 // C++ [dcl.enum]p4: Following the closing brace of an 6361 // enum-specifier, each enumerator has the type of its 6362 // enumeration. 6363 ECD->setType(EnumType); 6364 continue; 6365 } else { 6366 NewTy = BestType; 6367 NewWidth = BestWidth; 6368 NewSign = BestType->isSignedIntegerType(); 6369 } 6370 6371 // Adjust the APSInt value. 6372 InitVal.extOrTrunc(NewWidth); 6373 InitVal.setIsSigned(NewSign); 6374 ECD->setInitVal(InitVal); 6375 6376 // Adjust the Expr initializer and type. 6377 if (ECD->getInitExpr()) 6378 ECD->setInitExpr(new (Context) ImplicitCastExpr(NewTy, 6379 CastExpr::CK_IntegralCast, 6380 ECD->getInitExpr(), 6381 /*isLvalue=*/false)); 6382 if (getLangOptions().CPlusPlus) 6383 // C++ [dcl.enum]p4: Following the closing brace of an 6384 // enum-specifier, each enumerator has the type of its 6385 // enumeration. 6386 ECD->setType(EnumType); 6387 else 6388 ECD->setType(NewTy); 6389 } 6390 6391 Enum->completeDefinition(BestType, BestPromotionType); 6392} 6393 6394Sema::DeclPtrTy Sema::ActOnFileScopeAsmDecl(SourceLocation Loc, 6395 ExprArg expr) { 6396 StringLiteral *AsmString = cast<StringLiteral>(expr.takeAs<Expr>()); 6397 6398 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext, 6399 Loc, AsmString); 6400 CurContext->addDecl(New); 6401 return DeclPtrTy::make(New); 6402} 6403 6404void Sema::ActOnPragmaWeakID(IdentifierInfo* Name, 6405 SourceLocation PragmaLoc, 6406 SourceLocation NameLoc) { 6407 Decl *PrevDecl = LookupSingleName(TUScope, Name, LookupOrdinaryName); 6408 6409 if (PrevDecl) { 6410 PrevDecl->addAttr(::new (Context) WeakAttr()); 6411 } else { 6412 (void)WeakUndeclaredIdentifiers.insert( 6413 std::pair<IdentifierInfo*,WeakInfo> 6414 (Name, WeakInfo((IdentifierInfo*)0, NameLoc))); 6415 } 6416} 6417 6418void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name, 6419 IdentifierInfo* AliasName, 6420 SourceLocation PragmaLoc, 6421 SourceLocation NameLoc, 6422 SourceLocation AliasNameLoc) { 6423 Decl *PrevDecl = LookupSingleName(TUScope, AliasName, LookupOrdinaryName); 6424 WeakInfo W = WeakInfo(Name, NameLoc); 6425 6426 if (PrevDecl) { 6427 if (!PrevDecl->hasAttr<AliasAttr>()) 6428 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl)) 6429 DeclApplyPragmaWeak(TUScope, ND, W); 6430 } else { 6431 (void)WeakUndeclaredIdentifiers.insert( 6432 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W)); 6433 } 6434} 6435