SemaDecl.cpp revision e20fbc00b00b6a10c2d54afbd4a5ecd92a981b00
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 "clang/Sema/Sema.h" 15#include "clang/Sema/Initialization.h" 16#include "clang/Sema/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/Sema/DeclSpec.h" 25#include "clang/Sema/ParsedTemplate.h" 26#include "clang/Parse/ParseDiagnostic.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, 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, 91 // so build a dependent node to describe the type. 92 return CheckTypenameType(ETK_None, 93 (NestedNameSpecifier *)SS->getScopeRep(), II, 94 SourceLocation(), SS->getRange(), NameLoc 95 ).getAsOpaquePtr(); 96 } 97 98 return 0; 99 } 100 101 if (!LookupCtx->isDependentContext() && 102 RequireCompleteDeclContext(*SS, LookupCtx)) 103 return 0; 104 } 105 106 // FIXME: LookupNestedNameSpecifierName isn't the right kind of 107 // lookup for class-names. 108 LookupNameKind Kind = isClassName ? LookupNestedNameSpecifierName : 109 LookupOrdinaryName; 110 LookupResult Result(*this, &II, NameLoc, Kind); 111 if (LookupCtx) { 112 // Perform "qualified" name lookup into the declaration context we 113 // computed, which is either the type of the base of a member access 114 // expression or the declaration context associated with a prior 115 // nested-name-specifier. 116 LookupQualifiedName(Result, LookupCtx); 117 118 if (ObjectTypePtr && Result.empty()) { 119 // C++ [basic.lookup.classref]p3: 120 // If the unqualified-id is ~type-name, the type-name is looked up 121 // in the context of the entire postfix-expression. If the type T of 122 // the object expression is of a class type C, the type-name is also 123 // looked up in the scope of class C. At least one of the lookups shall 124 // find a name that refers to (possibly cv-qualified) T. 125 LookupName(Result, S); 126 } 127 } else { 128 // Perform unqualified name lookup. 129 LookupName(Result, S); 130 } 131 132 NamedDecl *IIDecl = 0; 133 switch (Result.getResultKind()) { 134 case LookupResult::NotFound: 135 case LookupResult::NotFoundInCurrentInstantiation: 136 case LookupResult::FoundOverloaded: 137 case LookupResult::FoundUnresolvedValue: 138 Result.suppressDiagnostics(); 139 return 0; 140 141 case LookupResult::Ambiguous: 142 // Recover from type-hiding ambiguities by hiding the type. We'll 143 // do the lookup again when looking for an object, and we can 144 // diagnose the error then. If we don't do this, then the error 145 // about hiding the type will be immediately followed by an error 146 // that only makes sense if the identifier was treated like a type. 147 if (Result.getAmbiguityKind() == LookupResult::AmbiguousTagHiding) { 148 Result.suppressDiagnostics(); 149 return 0; 150 } 151 152 // Look to see if we have a type anywhere in the list of results. 153 for (LookupResult::iterator Res = Result.begin(), ResEnd = Result.end(); 154 Res != ResEnd; ++Res) { 155 if (isa<TypeDecl>(*Res) || isa<ObjCInterfaceDecl>(*Res)) { 156 if (!IIDecl || 157 (*Res)->getLocation().getRawEncoding() < 158 IIDecl->getLocation().getRawEncoding()) 159 IIDecl = *Res; 160 } 161 } 162 163 if (!IIDecl) { 164 // None of the entities we found is a type, so there is no way 165 // to even assume that the result is a type. In this case, don't 166 // complain about the ambiguity. The parser will either try to 167 // perform this lookup again (e.g., as an object name), which 168 // will produce the ambiguity, or will complain that it expected 169 // a type name. 170 Result.suppressDiagnostics(); 171 return 0; 172 } 173 174 // We found a type within the ambiguous lookup; diagnose the 175 // ambiguity and then return that type. This might be the right 176 // answer, or it might not be, but it suppresses any attempt to 177 // perform the name lookup again. 178 break; 179 180 case LookupResult::Found: 181 IIDecl = Result.getFoundDecl(); 182 break; 183 } 184 185 assert(IIDecl && "Didn't find decl"); 186 187 QualType T; 188 if (TypeDecl *TD = dyn_cast<TypeDecl>(IIDecl)) { 189 DiagnoseUseOfDecl(IIDecl, NameLoc); 190 191 if (T.isNull()) 192 T = Context.getTypeDeclType(TD); 193 194 if (SS) 195 T = getElaboratedType(ETK_None, *SS, T); 196 197 } else if (ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(IIDecl)) { 198 T = Context.getObjCInterfaceType(IDecl); 199 } else { 200 // If it's not plausibly a type, suppress diagnostics. 201 Result.suppressDiagnostics(); 202 return 0; 203 } 204 205 return T.getAsOpaquePtr(); 206} 207 208/// isTagName() - This method is called *for error recovery purposes only* 209/// to determine if the specified name is a valid tag name ("struct foo"). If 210/// so, this returns the TST for the tag corresponding to it (TST_enum, 211/// TST_union, TST_struct, TST_class). This is used to diagnose cases in C 212/// where the user forgot to specify the tag. 213DeclSpec::TST Sema::isTagName(IdentifierInfo &II, Scope *S) { 214 // Do a tag name lookup in this scope. 215 LookupResult R(*this, &II, SourceLocation(), LookupTagName); 216 LookupName(R, S, false); 217 R.suppressDiagnostics(); 218 if (R.getResultKind() == LookupResult::Found) 219 if (const TagDecl *TD = R.getAsSingle<TagDecl>()) { 220 switch (TD->getTagKind()) { 221 default: return DeclSpec::TST_unspecified; 222 case TTK_Struct: return DeclSpec::TST_struct; 223 case TTK_Union: return DeclSpec::TST_union; 224 case TTK_Class: return DeclSpec::TST_class; 225 case TTK_Enum: return DeclSpec::TST_enum; 226 } 227 } 228 229 return DeclSpec::TST_unspecified; 230} 231 232bool Sema::DiagnoseUnknownTypeName(const IdentifierInfo &II, 233 SourceLocation IILoc, 234 Scope *S, 235 CXXScopeSpec *SS, 236 TypeTy *&SuggestedType) { 237 // We don't have anything to suggest (yet). 238 SuggestedType = 0; 239 240 // There may have been a typo in the name of the type. Look up typo 241 // results, in case we have something that we can suggest. 242 LookupResult Lookup(*this, &II, IILoc, LookupOrdinaryName, 243 NotForRedeclaration); 244 245 if (DeclarationName Corrected = CorrectTypo(Lookup, S, SS, 0, 0, CTC_Type)) { 246 if (NamedDecl *Result = Lookup.getAsSingle<NamedDecl>()) { 247 if ((isa<TypeDecl>(Result) || isa<ObjCInterfaceDecl>(Result)) && 248 !Result->isInvalidDecl()) { 249 // We found a similarly-named type or interface; suggest that. 250 if (!SS || !SS->isSet()) 251 Diag(IILoc, diag::err_unknown_typename_suggest) 252 << &II << Lookup.getLookupName() 253 << FixItHint::CreateReplacement(SourceRange(IILoc), 254 Result->getNameAsString()); 255 else if (DeclContext *DC = computeDeclContext(*SS, false)) 256 Diag(IILoc, diag::err_unknown_nested_typename_suggest) 257 << &II << DC << Lookup.getLookupName() << SS->getRange() 258 << FixItHint::CreateReplacement(SourceRange(IILoc), 259 Result->getNameAsString()); 260 else 261 llvm_unreachable("could not have corrected a typo here"); 262 263 Diag(Result->getLocation(), diag::note_previous_decl) 264 << Result->getDeclName(); 265 266 SuggestedType = getTypeName(*Result->getIdentifier(), IILoc, S, SS); 267 return true; 268 } 269 } else if (Lookup.empty()) { 270 // We corrected to a keyword. 271 // FIXME: Actually recover with the keyword we suggest, and emit a fix-it. 272 Diag(IILoc, diag::err_unknown_typename_suggest) 273 << &II << Corrected; 274 return true; 275 } 276 } 277 278 if (getLangOptions().CPlusPlus) { 279 // See if II is a class template that the user forgot to pass arguments to. 280 UnqualifiedId Name; 281 Name.setIdentifier(&II, IILoc); 282 CXXScopeSpec EmptySS; 283 TemplateTy TemplateResult; 284 bool MemberOfUnknownSpecialization; 285 if (isTemplateName(S, SS ? *SS : EmptySS, /*hasTemplateKeyword=*/false, 286 Name, 0, true, TemplateResult, 287 MemberOfUnknownSpecialization) == TNK_Type_template) { 288 TemplateName TplName = TemplateResult.getAsVal<TemplateName>(); 289 Diag(IILoc, diag::err_template_missing_args) << TplName; 290 if (TemplateDecl *TplDecl = TplName.getAsTemplateDecl()) { 291 Diag(TplDecl->getLocation(), diag::note_template_decl_here) 292 << TplDecl->getTemplateParameters()->getSourceRange(); 293 } 294 return true; 295 } 296 } 297 298 // FIXME: Should we move the logic that tries to recover from a missing tag 299 // (struct, union, enum) from Parser::ParseImplicitInt here, instead? 300 301 if (!SS || (!SS->isSet() && !SS->isInvalid())) 302 Diag(IILoc, diag::err_unknown_typename) << &II; 303 else if (DeclContext *DC = computeDeclContext(*SS, false)) 304 Diag(IILoc, diag::err_typename_nested_not_found) 305 << &II << DC << SS->getRange(); 306 else if (isDependentScopeSpecifier(*SS)) { 307 Diag(SS->getRange().getBegin(), diag::err_typename_missing) 308 << (NestedNameSpecifier *)SS->getScopeRep() << II.getName() 309 << SourceRange(SS->getRange().getBegin(), IILoc) 310 << FixItHint::CreateInsertion(SS->getRange().getBegin(), "typename "); 311 SuggestedType = ActOnTypenameType(S, SourceLocation(), *SS, II, IILoc).get(); 312 } else { 313 assert(SS && SS->isInvalid() && 314 "Invalid scope specifier has already been diagnosed"); 315 } 316 317 return true; 318} 319 320// Determines the context to return to after temporarily entering a 321// context. This depends in an unnecessarily complicated way on the 322// exact ordering of callbacks from the parser. 323DeclContext *Sema::getContainingDC(DeclContext *DC) { 324 325 // Functions defined inline within classes aren't parsed until we've 326 // finished parsing the top-level class, so the top-level class is 327 // the context we'll need to return to. 328 if (isa<FunctionDecl>(DC)) { 329 DC = DC->getLexicalParent(); 330 331 // A function not defined within a class will always return to its 332 // lexical context. 333 if (!isa<CXXRecordDecl>(DC)) 334 return DC; 335 336 // A C++ inline method/friend is parsed *after* the topmost class 337 // it was declared in is fully parsed ("complete"); the topmost 338 // class is the context we need to return to. 339 while (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC->getLexicalParent())) 340 DC = RD; 341 342 // Return the declaration context of the topmost class the inline method is 343 // declared in. 344 return DC; 345 } 346 347 // ObjCMethodDecls are parsed (for some reason) outside the context 348 // of the class. 349 if (isa<ObjCMethodDecl>(DC)) 350 return DC->getLexicalParent()->getLexicalParent(); 351 352 return DC->getLexicalParent(); 353} 354 355void Sema::PushDeclContext(Scope *S, DeclContext *DC) { 356 assert(getContainingDC(DC) == CurContext && 357 "The next DeclContext should be lexically contained in the current one."); 358 CurContext = DC; 359 S->setEntity(DC); 360} 361 362void Sema::PopDeclContext() { 363 assert(CurContext && "DeclContext imbalance!"); 364 365 CurContext = getContainingDC(CurContext); 366 assert(CurContext && "Popped translation unit!"); 367} 368 369/// EnterDeclaratorContext - Used when we must lookup names in the context 370/// of a declarator's nested name specifier. 371/// 372void Sema::EnterDeclaratorContext(Scope *S, DeclContext *DC) { 373 // C++0x [basic.lookup.unqual]p13: 374 // A name used in the definition of a static data member of class 375 // X (after the qualified-id of the static member) is looked up as 376 // if the name was used in a member function of X. 377 // C++0x [basic.lookup.unqual]p14: 378 // If a variable member of a namespace is defined outside of the 379 // scope of its namespace then any name used in the definition of 380 // the variable member (after the declarator-id) is looked up as 381 // if the definition of the variable member occurred in its 382 // namespace. 383 // Both of these imply that we should push a scope whose context 384 // is the semantic context of the declaration. We can't use 385 // PushDeclContext here because that context is not necessarily 386 // lexically contained in the current context. Fortunately, 387 // the containing scope should have the appropriate information. 388 389 assert(!S->getEntity() && "scope already has entity"); 390 391#ifndef NDEBUG 392 Scope *Ancestor = S->getParent(); 393 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 394 assert(Ancestor->getEntity() == CurContext && "ancestor context mismatch"); 395#endif 396 397 CurContext = DC; 398 S->setEntity(DC); 399} 400 401void Sema::ExitDeclaratorContext(Scope *S) { 402 assert(S->getEntity() == CurContext && "Context imbalance!"); 403 404 // Switch back to the lexical context. The safety of this is 405 // enforced by an assert in EnterDeclaratorContext. 406 Scope *Ancestor = S->getParent(); 407 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 408 CurContext = (DeclContext*) Ancestor->getEntity(); 409 410 // We don't need to do anything with the scope, which is going to 411 // disappear. 412} 413 414/// \brief Determine whether we allow overloading of the function 415/// PrevDecl with another declaration. 416/// 417/// This routine determines whether overloading is possible, not 418/// whether some new function is actually an overload. It will return 419/// true in C++ (where we can always provide overloads) or, as an 420/// extension, in C when the previous function is already an 421/// overloaded function declaration or has the "overloadable" 422/// attribute. 423static bool AllowOverloadingOfFunction(LookupResult &Previous, 424 ASTContext &Context) { 425 if (Context.getLangOptions().CPlusPlus) 426 return true; 427 428 if (Previous.getResultKind() == LookupResult::FoundOverloaded) 429 return true; 430 431 return (Previous.getResultKind() == LookupResult::Found 432 && Previous.getFoundDecl()->hasAttr<OverloadableAttr>()); 433} 434 435/// Add this decl to the scope shadowed decl chains. 436void Sema::PushOnScopeChains(NamedDecl *D, Scope *S, bool AddToContext) { 437 // Move up the scope chain until we find the nearest enclosing 438 // non-transparent context. The declaration will be introduced into this 439 // scope. 440 while (S->getEntity() && 441 ((DeclContext *)S->getEntity())->isTransparentContext()) 442 S = S->getParent(); 443 444 // Add scoped declarations into their context, so that they can be 445 // found later. Declarations without a context won't be inserted 446 // into any context. 447 if (AddToContext) 448 CurContext->addDecl(D); 449 450 // Out-of-line definitions shouldn't be pushed into scope in C++. 451 // Out-of-line variable and function definitions shouldn't even in C. 452 if ((getLangOptions().CPlusPlus || isa<VarDecl>(D) || isa<FunctionDecl>(D)) && 453 D->isOutOfLine()) 454 return; 455 456 // Template instantiations should also not be pushed into scope. 457 if (isa<FunctionDecl>(D) && 458 cast<FunctionDecl>(D)->isFunctionTemplateSpecialization()) 459 return; 460 461 // If this replaces anything in the current scope, 462 IdentifierResolver::iterator I = IdResolver.begin(D->getDeclName()), 463 IEnd = IdResolver.end(); 464 for (; I != IEnd; ++I) { 465 if (S->isDeclScope(DeclPtrTy::make(*I)) && D->declarationReplaces(*I)) { 466 S->RemoveDecl(DeclPtrTy::make(*I)); 467 IdResolver.RemoveDecl(*I); 468 469 // Should only need to replace one decl. 470 break; 471 } 472 } 473 474 S->AddDecl(DeclPtrTy::make(D)); 475 IdResolver.AddDecl(D); 476} 477 478bool Sema::isDeclInScope(NamedDecl *&D, DeclContext *Ctx, Scope *S) { 479 return IdResolver.isDeclInScope(D, Ctx, Context, S); 480} 481 482static bool isOutOfScopePreviousDeclaration(NamedDecl *, 483 DeclContext*, 484 ASTContext&); 485 486/// Filters out lookup results that don't fall within the given scope 487/// as determined by isDeclInScope. 488static void FilterLookupForScope(Sema &SemaRef, LookupResult &R, 489 DeclContext *Ctx, Scope *S, 490 bool ConsiderLinkage) { 491 LookupResult::Filter F = R.makeFilter(); 492 while (F.hasNext()) { 493 NamedDecl *D = F.next(); 494 495 if (SemaRef.isDeclInScope(D, Ctx, S)) 496 continue; 497 498 if (ConsiderLinkage && 499 isOutOfScopePreviousDeclaration(D, Ctx, SemaRef.Context)) 500 continue; 501 502 F.erase(); 503 } 504 505 F.done(); 506} 507 508static bool isUsingDecl(NamedDecl *D) { 509 return isa<UsingShadowDecl>(D) || 510 isa<UnresolvedUsingTypenameDecl>(D) || 511 isa<UnresolvedUsingValueDecl>(D); 512} 513 514/// Removes using shadow declarations from the lookup results. 515static void RemoveUsingDecls(LookupResult &R) { 516 LookupResult::Filter F = R.makeFilter(); 517 while (F.hasNext()) 518 if (isUsingDecl(F.next())) 519 F.erase(); 520 521 F.done(); 522} 523 524/// \brief Check for this common pattern: 525/// @code 526/// class S { 527/// S(const S&); // DO NOT IMPLEMENT 528/// void operator=(const S&); // DO NOT IMPLEMENT 529/// }; 530/// @endcode 531static bool IsDisallowedCopyOrAssign(const CXXMethodDecl *D) { 532 // FIXME: Should check for private access too but access is set after we get 533 // the decl here. 534 if (D->isThisDeclarationADefinition()) 535 return false; 536 537 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(D)) 538 return CD->isCopyConstructor(); 539 return D->isCopyAssignment(); 540} 541 542bool Sema::ShouldWarnIfUnusedFileScopedDecl(const DeclaratorDecl *D) const { 543 assert(D); 544 545 if (D->isInvalidDecl() || D->isUsed() || D->hasAttr<UnusedAttr>()) 546 return false; 547 548 // Ignore class templates. 549 if (D->getDeclContext()->isDependentContext()) 550 return false; 551 552 // We warn for unused decls internal to the translation unit. 553 if (D->getLinkage() == ExternalLinkage) 554 return false; 555 556 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 557 if (FD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 558 return false; 559 560 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 561 if (MD->isVirtual() || IsDisallowedCopyOrAssign(MD)) 562 return false; 563 } else { 564 // 'static inline' functions are used in headers; don't warn. 565 if (FD->getStorageClass() == FunctionDecl::Static && 566 FD->isInlineSpecified()) 567 return false; 568 } 569 570 if (FD->isThisDeclarationADefinition()) 571 return !Context.DeclMustBeEmitted(FD); 572 return true; 573 } 574 575 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 576 if (VD->isStaticDataMember() && 577 VD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 578 return false; 579 580 if ( VD->isFileVarDecl() && 581 !VD->getType().isConstant(Context)) 582 return !Context.DeclMustBeEmitted(VD); 583 } 584 585 return false; 586 } 587 588 void Sema::MarkUnusedFileScopedDecl(const DeclaratorDecl *D) { 589 if (!D) 590 return; 591 592 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 593 const FunctionDecl *First = FD->getFirstDeclaration(); 594 if (FD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 595 return; // First should already be in the vector. 596 } 597 598 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 599 const VarDecl *First = VD->getFirstDeclaration(); 600 if (VD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 601 return; // First should already be in the vector. 602 } 603 604 if (ShouldWarnIfUnusedFileScopedDecl(D)) 605 UnusedFileScopedDecls.push_back(D); 606 } 607 608static bool ShouldDiagnoseUnusedDecl(const NamedDecl *D) { 609 if (D->isInvalidDecl()) 610 return false; 611 612 if (D->isUsed() || D->hasAttr<UnusedAttr>()) 613 return false; 614 615 // White-list anything that isn't a local variable. 616 if (!isa<VarDecl>(D) || isa<ParmVarDecl>(D) || isa<ImplicitParamDecl>(D) || 617 !D->getDeclContext()->isFunctionOrMethod()) 618 return false; 619 620 // Types of valid local variables should be complete, so this should succeed. 621 if (const ValueDecl *VD = dyn_cast<ValueDecl>(D)) { 622 623 // White-list anything with an __attribute__((unused)) type. 624 QualType Ty = VD->getType(); 625 626 // Only look at the outermost level of typedef. 627 if (const TypedefType *TT = dyn_cast<TypedefType>(Ty)) { 628 if (TT->getDecl()->hasAttr<UnusedAttr>()) 629 return false; 630 } 631 632 // If we failed to complete the type for some reason, or if the type is 633 // dependent, don't diagnose the variable. 634 if (Ty->isIncompleteType() || Ty->isDependentType()) 635 return false; 636 637 if (const TagType *TT = Ty->getAs<TagType>()) { 638 const TagDecl *Tag = TT->getDecl(); 639 if (Tag->hasAttr<UnusedAttr>()) 640 return false; 641 642 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Tag)) { 643 // FIXME: Checking for the presence of a user-declared constructor 644 // isn't completely accurate; we'd prefer to check that the initializer 645 // has no side effects. 646 if (RD->hasUserDeclaredConstructor() || !RD->hasTrivialDestructor()) 647 return false; 648 } 649 } 650 651 // TODO: __attribute__((unused)) templates? 652 } 653 654 return true; 655} 656 657void Sema::DiagnoseUnusedDecl(const NamedDecl *D) { 658 if (!ShouldDiagnoseUnusedDecl(D)) 659 return; 660 661 if (isa<VarDecl>(D) && cast<VarDecl>(D)->isExceptionVariable()) 662 Diag(D->getLocation(), diag::warn_unused_exception_param) 663 << D->getDeclName(); 664 else 665 Diag(D->getLocation(), diag::warn_unused_variable) 666 << D->getDeclName(); 667} 668 669void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) { 670 if (S->decl_empty()) return; 671 assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) && 672 "Scope shouldn't contain decls!"); 673 674 for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end(); 675 I != E; ++I) { 676 Decl *TmpD = (*I).getAs<Decl>(); 677 assert(TmpD && "This decl didn't get pushed??"); 678 679 assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?"); 680 NamedDecl *D = cast<NamedDecl>(TmpD); 681 682 if (!D->getDeclName()) continue; 683 684 // Diagnose unused variables in this scope. 685 if (S->getNumErrorsAtStart() == getDiagnostics().getNumErrors()) 686 DiagnoseUnusedDecl(D); 687 688 // Remove this name from our lexical scope. 689 IdResolver.RemoveDecl(D); 690 } 691} 692 693/// \brief Look for an Objective-C class in the translation unit. 694/// 695/// \param Id The name of the Objective-C class we're looking for. If 696/// typo-correction fixes this name, the Id will be updated 697/// to the fixed name. 698/// 699/// \param IdLoc The location of the name in the translation unit. 700/// 701/// \param TypoCorrection If true, this routine will attempt typo correction 702/// if there is no class with the given name. 703/// 704/// \returns The declaration of the named Objective-C class, or NULL if the 705/// class could not be found. 706ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *&Id, 707 SourceLocation IdLoc, 708 bool TypoCorrection) { 709 // The third "scope" argument is 0 since we aren't enabling lazy built-in 710 // creation from this context. 711 NamedDecl *IDecl = LookupSingleName(TUScope, Id, IdLoc, LookupOrdinaryName); 712 713 if (!IDecl && TypoCorrection) { 714 // Perform typo correction at the given location, but only if we 715 // find an Objective-C class name. 716 LookupResult R(*this, Id, IdLoc, LookupOrdinaryName); 717 if (CorrectTypo(R, TUScope, 0, 0, false, CTC_NoKeywords) && 718 (IDecl = R.getAsSingle<ObjCInterfaceDecl>())) { 719 Diag(IdLoc, diag::err_undef_interface_suggest) 720 << Id << IDecl->getDeclName() 721 << FixItHint::CreateReplacement(IdLoc, IDecl->getNameAsString()); 722 Diag(IDecl->getLocation(), diag::note_previous_decl) 723 << IDecl->getDeclName(); 724 725 Id = IDecl->getIdentifier(); 726 } 727 } 728 729 return dyn_cast_or_null<ObjCInterfaceDecl>(IDecl); 730} 731 732/// getNonFieldDeclScope - Retrieves the innermost scope, starting 733/// from S, where a non-field would be declared. This routine copes 734/// with the difference between C and C++ scoping rules in structs and 735/// unions. For example, the following code is well-formed in C but 736/// ill-formed in C++: 737/// @code 738/// struct S6 { 739/// enum { BAR } e; 740/// }; 741/// 742/// void test_S6() { 743/// struct S6 a; 744/// a.e = BAR; 745/// } 746/// @endcode 747/// For the declaration of BAR, this routine will return a different 748/// scope. The scope S will be the scope of the unnamed enumeration 749/// within S6. In C++, this routine will return the scope associated 750/// with S6, because the enumeration's scope is a transparent 751/// context but structures can contain non-field names. In C, this 752/// routine will return the translation unit scope, since the 753/// enumeration's scope is a transparent context and structures cannot 754/// contain non-field names. 755Scope *Sema::getNonFieldDeclScope(Scope *S) { 756 while (((S->getFlags() & Scope::DeclScope) == 0) || 757 (S->getEntity() && 758 ((DeclContext *)S->getEntity())->isTransparentContext()) || 759 (S->isClassScope() && !getLangOptions().CPlusPlus)) 760 S = S->getParent(); 761 return S; 762} 763 764void Sema::InitBuiltinVaListType() { 765 if (!Context.getBuiltinVaListType().isNull()) 766 return; 767 768 IdentifierInfo *VaIdent = &Context.Idents.get("__builtin_va_list"); 769 NamedDecl *VaDecl = LookupSingleName(TUScope, VaIdent, SourceLocation(), 770 LookupOrdinaryName, ForRedeclaration); 771 TypedefDecl *VaTypedef = cast<TypedefDecl>(VaDecl); 772 Context.setBuiltinVaListType(Context.getTypedefType(VaTypedef)); 773} 774 775/// LazilyCreateBuiltin - The specified Builtin-ID was first used at 776/// file scope. lazily create a decl for it. ForRedeclaration is true 777/// if we're creating this built-in in anticipation of redeclaring the 778/// built-in. 779NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid, 780 Scope *S, bool ForRedeclaration, 781 SourceLocation Loc) { 782 Builtin::ID BID = (Builtin::ID)bid; 783 784 if (Context.BuiltinInfo.hasVAListUse(BID)) 785 InitBuiltinVaListType(); 786 787 ASTContext::GetBuiltinTypeError Error; 788 QualType R = Context.GetBuiltinType(BID, Error); 789 switch (Error) { 790 case ASTContext::GE_None: 791 // Okay 792 break; 793 794 case ASTContext::GE_Missing_stdio: 795 if (ForRedeclaration) 796 Diag(Loc, diag::err_implicit_decl_requires_stdio) 797 << Context.BuiltinInfo.GetName(BID); 798 return 0; 799 800 case ASTContext::GE_Missing_setjmp: 801 if (ForRedeclaration) 802 Diag(Loc, diag::err_implicit_decl_requires_setjmp) 803 << Context.BuiltinInfo.GetName(BID); 804 return 0; 805 } 806 807 if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) { 808 Diag(Loc, diag::ext_implicit_lib_function_decl) 809 << Context.BuiltinInfo.GetName(BID) 810 << R; 811 if (Context.BuiltinInfo.getHeaderName(BID) && 812 Diags.getDiagnosticLevel(diag::ext_implicit_lib_function_decl) 813 != Diagnostic::Ignored) 814 Diag(Loc, diag::note_please_include_header) 815 << Context.BuiltinInfo.getHeaderName(BID) 816 << Context.BuiltinInfo.GetName(BID); 817 } 818 819 FunctionDecl *New = FunctionDecl::Create(Context, 820 Context.getTranslationUnitDecl(), 821 Loc, II, R, /*TInfo=*/0, 822 FunctionDecl::Extern, 823 FunctionDecl::None, false, 824 /*hasPrototype=*/true); 825 New->setImplicit(); 826 827 // Create Decl objects for each parameter, adding them to the 828 // FunctionDecl. 829 if (FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) { 830 llvm::SmallVector<ParmVarDecl*, 16> Params; 831 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) 832 Params.push_back(ParmVarDecl::Create(Context, New, SourceLocation(), 0, 833 FT->getArgType(i), /*TInfo=*/0, 834 VarDecl::None, VarDecl::None, 0)); 835 New->setParams(Params.data(), Params.size()); 836 } 837 838 AddKnownFunctionAttributes(New); 839 840 // TUScope is the translation-unit scope to insert this function into. 841 // FIXME: This is hideous. We need to teach PushOnScopeChains to 842 // relate Scopes to DeclContexts, and probably eliminate CurContext 843 // entirely, but we're not there yet. 844 DeclContext *SavedContext = CurContext; 845 CurContext = Context.getTranslationUnitDecl(); 846 PushOnScopeChains(New, TUScope); 847 CurContext = SavedContext; 848 return New; 849} 850 851/// MergeTypeDefDecl - We just parsed a typedef 'New' which has the 852/// same name and scope as a previous declaration 'Old'. Figure out 853/// how to resolve this situation, merging decls or emitting 854/// diagnostics as appropriate. If there was an error, set New to be invalid. 855/// 856void Sema::MergeTypeDefDecl(TypedefDecl *New, LookupResult &OldDecls) { 857 // If the new decl is known invalid already, don't bother doing any 858 // merging checks. 859 if (New->isInvalidDecl()) return; 860 861 // Allow multiple definitions for ObjC built-in typedefs. 862 // FIXME: Verify the underlying types are equivalent! 863 if (getLangOptions().ObjC1) { 864 const IdentifierInfo *TypeID = New->getIdentifier(); 865 switch (TypeID->getLength()) { 866 default: break; 867 case 2: 868 if (!TypeID->isStr("id")) 869 break; 870 Context.ObjCIdRedefinitionType = New->getUnderlyingType(); 871 // Install the built-in type for 'id', ignoring the current definition. 872 New->setTypeForDecl(Context.getObjCIdType().getTypePtr()); 873 return; 874 case 5: 875 if (!TypeID->isStr("Class")) 876 break; 877 Context.ObjCClassRedefinitionType = New->getUnderlyingType(); 878 // Install the built-in type for 'Class', ignoring the current definition. 879 New->setTypeForDecl(Context.getObjCClassType().getTypePtr()); 880 return; 881 case 3: 882 if (!TypeID->isStr("SEL")) 883 break; 884 Context.ObjCSelRedefinitionType = New->getUnderlyingType(); 885 // Install the built-in type for 'SEL', ignoring the current definition. 886 New->setTypeForDecl(Context.getObjCSelType().getTypePtr()); 887 return; 888 case 8: 889 if (!TypeID->isStr("Protocol")) 890 break; 891 Context.setObjCProtoType(New->getUnderlyingType()); 892 return; 893 } 894 // Fall through - the typedef name was not a builtin type. 895 } 896 897 // Verify the old decl was also a type. 898 TypeDecl *Old = OldDecls.getAsSingle<TypeDecl>(); 899 if (!Old) { 900 Diag(New->getLocation(), diag::err_redefinition_different_kind) 901 << New->getDeclName(); 902 903 NamedDecl *OldD = OldDecls.getRepresentativeDecl(); 904 if (OldD->getLocation().isValid()) 905 Diag(OldD->getLocation(), diag::note_previous_definition); 906 907 return New->setInvalidDecl(); 908 } 909 910 // If the old declaration is invalid, just give up here. 911 if (Old->isInvalidDecl()) 912 return New->setInvalidDecl(); 913 914 // Determine the "old" type we'll use for checking and diagnostics. 915 QualType OldType; 916 if (TypedefDecl *OldTypedef = dyn_cast<TypedefDecl>(Old)) 917 OldType = OldTypedef->getUnderlyingType(); 918 else 919 OldType = Context.getTypeDeclType(Old); 920 921 // If the typedef types are not identical, reject them in all languages and 922 // with any extensions enabled. 923 924 if (OldType != New->getUnderlyingType() && 925 Context.getCanonicalType(OldType) != 926 Context.getCanonicalType(New->getUnderlyingType())) { 927 Diag(New->getLocation(), diag::err_redefinition_different_typedef) 928 << New->getUnderlyingType() << OldType; 929 if (Old->getLocation().isValid()) 930 Diag(Old->getLocation(), diag::note_previous_definition); 931 return New->setInvalidDecl(); 932 } 933 934 // The types match. Link up the redeclaration chain if the old 935 // declaration was a typedef. 936 // FIXME: this is a potential source of wierdness if the type 937 // spellings don't match exactly. 938 if (isa<TypedefDecl>(Old)) 939 New->setPreviousDeclaration(cast<TypedefDecl>(Old)); 940 941 if (getLangOptions().Microsoft) 942 return; 943 944 if (getLangOptions().CPlusPlus) { 945 // C++ [dcl.typedef]p2: 946 // In a given non-class scope, a typedef specifier can be used to 947 // redefine the name of any type declared in that scope to refer 948 // to the type to which it already refers. 949 if (!isa<CXXRecordDecl>(CurContext)) 950 return; 951 952 // C++0x [dcl.typedef]p4: 953 // In a given class scope, a typedef specifier can be used to redefine 954 // any class-name declared in that scope that is not also a typedef-name 955 // to refer to the type to which it already refers. 956 // 957 // This wording came in via DR424, which was a correction to the 958 // wording in DR56, which accidentally banned code like: 959 // 960 // struct S { 961 // typedef struct A { } A; 962 // }; 963 // 964 // in the C++03 standard. We implement the C++0x semantics, which 965 // allow the above but disallow 966 // 967 // struct S { 968 // typedef int I; 969 // typedef int I; 970 // }; 971 // 972 // since that was the intent of DR56. 973 if (!isa<TypedefDecl >(Old)) 974 return; 975 976 Diag(New->getLocation(), diag::err_redefinition) 977 << New->getDeclName(); 978 Diag(Old->getLocation(), diag::note_previous_definition); 979 return New->setInvalidDecl(); 980 } 981 982 // If we have a redefinition of a typedef in C, emit a warning. This warning 983 // is normally mapped to an error, but can be controlled with 984 // -Wtypedef-redefinition. If either the original or the redefinition is 985 // in a system header, don't emit this for compatibility with GCC. 986 if (getDiagnostics().getSuppressSystemWarnings() && 987 (Context.getSourceManager().isInSystemHeader(Old->getLocation()) || 988 Context.getSourceManager().isInSystemHeader(New->getLocation()))) 989 return; 990 991 Diag(New->getLocation(), diag::warn_redefinition_of_typedef) 992 << New->getDeclName(); 993 Diag(Old->getLocation(), diag::note_previous_definition); 994 return; 995} 996 997/// DeclhasAttr - returns true if decl Declaration already has the target 998/// attribute. 999static bool 1000DeclHasAttr(const Decl *D, const Attr *A) { 1001 const OwnershipAttr *OA = dyn_cast<OwnershipAttr>(A); 1002 for (Decl::attr_iterator i = D->attr_begin(), e = D->attr_end(); i != e; ++i) 1003 if ((*i)->getKind() == A->getKind()) { 1004 // FIXME: Don't hardcode this check 1005 if (OA && isa<OwnershipAttr>(*i)) 1006 return OA->getOwnKind() == cast<OwnershipAttr>(*i)->getOwnKind(); 1007 return true; 1008 } 1009 1010 return false; 1011} 1012 1013/// MergeDeclAttributes - append attributes from the Old decl to the New one. 1014static void MergeDeclAttributes(Decl *New, Decl *Old, ASTContext &C) { 1015 if (!Old->hasAttrs()) 1016 return; 1017 // Ensure that any moving of objects within the allocated map is done before 1018 // we process them. 1019 if (!New->hasAttrs()) 1020 New->setAttrs(AttrVec()); 1021 for (Decl::attr_iterator i = Old->attr_begin(), e = Old->attr_end(); i != e; 1022 ++i) { 1023 // FIXME: Make this more general than just checking for Overloadable. 1024 if (!DeclHasAttr(New, *i) && (*i)->getKind() != attr::Overloadable) { 1025 Attr *NewAttr = (*i)->clone(C); 1026 NewAttr->setInherited(true); 1027 New->addAttr(NewAttr); 1028 } 1029 } 1030} 1031 1032namespace { 1033 1034/// Used in MergeFunctionDecl to keep track of function parameters in 1035/// C. 1036struct GNUCompatibleParamWarning { 1037 ParmVarDecl *OldParm; 1038 ParmVarDecl *NewParm; 1039 QualType PromotedType; 1040}; 1041 1042} 1043 1044/// getSpecialMember - get the special member enum for a method. 1045Sema::CXXSpecialMember Sema::getSpecialMember(const CXXMethodDecl *MD) { 1046 if (const CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(MD)) { 1047 if (Ctor->isCopyConstructor()) 1048 return Sema::CXXCopyConstructor; 1049 1050 return Sema::CXXConstructor; 1051 } 1052 1053 if (isa<CXXDestructorDecl>(MD)) 1054 return Sema::CXXDestructor; 1055 1056 assert(MD->isCopyAssignment() && "Must have copy assignment operator"); 1057 return Sema::CXXCopyAssignment; 1058} 1059 1060/// canRedefineFunction - checks if a function can be redefined. Currently, 1061/// only extern inline functions can be redefined, and even then only in 1062/// GNU89 mode. 1063static bool canRedefineFunction(const FunctionDecl *FD, 1064 const LangOptions& LangOpts) { 1065 return (LangOpts.GNUMode && !LangOpts.C99 && !LangOpts.CPlusPlus && 1066 FD->isInlineSpecified() && 1067 FD->getStorageClass() == FunctionDecl::Extern); 1068} 1069 1070/// MergeFunctionDecl - We just parsed a function 'New' from 1071/// declarator D which has the same name and scope as a previous 1072/// declaration 'Old'. Figure out how to resolve this situation, 1073/// merging decls or emitting diagnostics as appropriate. 1074/// 1075/// In C++, New and Old must be declarations that are not 1076/// overloaded. Use IsOverload to determine whether New and Old are 1077/// overloaded, and to select the Old declaration that New should be 1078/// merged with. 1079/// 1080/// Returns true if there was an error, false otherwise. 1081bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD) { 1082 // Verify the old decl was also a function. 1083 FunctionDecl *Old = 0; 1084 if (FunctionTemplateDecl *OldFunctionTemplate 1085 = dyn_cast<FunctionTemplateDecl>(OldD)) 1086 Old = OldFunctionTemplate->getTemplatedDecl(); 1087 else 1088 Old = dyn_cast<FunctionDecl>(OldD); 1089 if (!Old) { 1090 if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(OldD)) { 1091 Diag(New->getLocation(), diag::err_using_decl_conflict_reverse); 1092 Diag(Shadow->getTargetDecl()->getLocation(), 1093 diag::note_using_decl_target); 1094 Diag(Shadow->getUsingDecl()->getLocation(), 1095 diag::note_using_decl) << 0; 1096 return true; 1097 } 1098 1099 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1100 << New->getDeclName(); 1101 Diag(OldD->getLocation(), diag::note_previous_definition); 1102 return true; 1103 } 1104 1105 // Determine whether the previous declaration was a definition, 1106 // implicit declaration, or a declaration. 1107 diag::kind PrevDiag; 1108 if (Old->isThisDeclarationADefinition()) 1109 PrevDiag = diag::note_previous_definition; 1110 else if (Old->isImplicit()) 1111 PrevDiag = diag::note_previous_implicit_declaration; 1112 else 1113 PrevDiag = diag::note_previous_declaration; 1114 1115 QualType OldQType = Context.getCanonicalType(Old->getType()); 1116 QualType NewQType = Context.getCanonicalType(New->getType()); 1117 1118 // Don't complain about this if we're in GNU89 mode and the old function 1119 // is an extern inline function. 1120 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) && 1121 New->getStorageClass() == FunctionDecl::Static && 1122 Old->getStorageClass() != FunctionDecl::Static && 1123 !canRedefineFunction(Old, getLangOptions())) { 1124 Diag(New->getLocation(), diag::err_static_non_static) 1125 << New; 1126 Diag(Old->getLocation(), PrevDiag); 1127 return true; 1128 } 1129 1130 // If a function is first declared with a calling convention, but is 1131 // later declared or defined without one, the second decl assumes the 1132 // calling convention of the first. 1133 // 1134 // For the new decl, we have to look at the NON-canonical type to tell the 1135 // difference between a function that really doesn't have a calling 1136 // convention and one that is declared cdecl. That's because in 1137 // canonicalization (see ASTContext.cpp), cdecl is canonicalized away 1138 // because it is the default calling convention. 1139 // 1140 // Note also that we DO NOT return at this point, because we still have 1141 // other tests to run. 1142 const FunctionType *OldType = OldQType->getAs<FunctionType>(); 1143 const FunctionType *NewType = New->getType()->getAs<FunctionType>(); 1144 const FunctionType::ExtInfo OldTypeInfo = OldType->getExtInfo(); 1145 const FunctionType::ExtInfo NewTypeInfo = NewType->getExtInfo(); 1146 if (OldTypeInfo.getCC() != CC_Default && 1147 NewTypeInfo.getCC() == CC_Default) { 1148 NewQType = Context.getCallConvType(NewQType, OldTypeInfo.getCC()); 1149 New->setType(NewQType); 1150 NewQType = Context.getCanonicalType(NewQType); 1151 } else if (!Context.isSameCallConv(OldTypeInfo.getCC(), 1152 NewTypeInfo.getCC())) { 1153 // Calling conventions really aren't compatible, so complain. 1154 Diag(New->getLocation(), diag::err_cconv_change) 1155 << FunctionType::getNameForCallConv(NewTypeInfo.getCC()) 1156 << (OldTypeInfo.getCC() == CC_Default) 1157 << (OldTypeInfo.getCC() == CC_Default ? "" : 1158 FunctionType::getNameForCallConv(OldTypeInfo.getCC())); 1159 Diag(Old->getLocation(), diag::note_previous_declaration); 1160 return true; 1161 } 1162 1163 // FIXME: diagnose the other way around? 1164 if (OldType->getNoReturnAttr() && !NewType->getNoReturnAttr()) { 1165 NewQType = Context.getNoReturnType(NewQType); 1166 New->setType(NewQType); 1167 assert(NewQType.isCanonical()); 1168 } 1169 1170 // Merge regparm attribute. 1171 if (OldType->getRegParmType() != NewType->getRegParmType()) { 1172 if (NewType->getRegParmType()) { 1173 Diag(New->getLocation(), diag::err_regparm_mismatch) 1174 << NewType->getRegParmType() 1175 << OldType->getRegParmType(); 1176 Diag(Old->getLocation(), diag::note_previous_declaration); 1177 return true; 1178 } 1179 1180 NewQType = Context.getRegParmType(NewQType, OldType->getRegParmType()); 1181 New->setType(NewQType); 1182 assert(NewQType.isCanonical()); 1183 } 1184 1185 if (getLangOptions().CPlusPlus) { 1186 // (C++98 13.1p2): 1187 // Certain function declarations cannot be overloaded: 1188 // -- Function declarations that differ only in the return type 1189 // cannot be overloaded. 1190 QualType OldReturnType 1191 = cast<FunctionType>(OldQType.getTypePtr())->getResultType(); 1192 QualType NewReturnType 1193 = cast<FunctionType>(NewQType.getTypePtr())->getResultType(); 1194 QualType ResQT; 1195 if (OldReturnType != NewReturnType) { 1196 if (NewReturnType->isObjCObjectPointerType() 1197 && OldReturnType->isObjCObjectPointerType()) 1198 ResQT = Context.mergeObjCGCQualifiers(NewQType, OldQType); 1199 if (ResQT.isNull()) { 1200 Diag(New->getLocation(), diag::err_ovl_diff_return_type); 1201 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1202 return true; 1203 } 1204 else 1205 NewQType = ResQT; 1206 } 1207 1208 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 1209 CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 1210 if (OldMethod && NewMethod) { 1211 // Preserve triviality. 1212 NewMethod->setTrivial(OldMethod->isTrivial()); 1213 1214 bool isFriend = NewMethod->getFriendObjectKind(); 1215 1216 if (!isFriend && NewMethod->getLexicalDeclContext()->isRecord()) { 1217 // -- Member function declarations with the same name and the 1218 // same parameter types cannot be overloaded if any of them 1219 // is a static member function declaration. 1220 if (OldMethod->isStatic() || NewMethod->isStatic()) { 1221 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 1222 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1223 return true; 1224 } 1225 1226 // C++ [class.mem]p1: 1227 // [...] A member shall not be declared twice in the 1228 // member-specification, except that a nested class or member 1229 // class template can be declared and then later defined. 1230 unsigned NewDiag; 1231 if (isa<CXXConstructorDecl>(OldMethod)) 1232 NewDiag = diag::err_constructor_redeclared; 1233 else if (isa<CXXDestructorDecl>(NewMethod)) 1234 NewDiag = diag::err_destructor_redeclared; 1235 else if (isa<CXXConversionDecl>(NewMethod)) 1236 NewDiag = diag::err_conv_function_redeclared; 1237 else 1238 NewDiag = diag::err_member_redeclared; 1239 1240 Diag(New->getLocation(), NewDiag); 1241 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1242 1243 // Complain if this is an explicit declaration of a special 1244 // member that was initially declared implicitly. 1245 // 1246 // As an exception, it's okay to befriend such methods in order 1247 // to permit the implicit constructor/destructor/operator calls. 1248 } else if (OldMethod->isImplicit()) { 1249 if (isFriend) { 1250 NewMethod->setImplicit(); 1251 } else { 1252 Diag(NewMethod->getLocation(), 1253 diag::err_definition_of_implicitly_declared_member) 1254 << New << getSpecialMember(OldMethod); 1255 return true; 1256 } 1257 } 1258 } 1259 1260 // (C++98 8.3.5p3): 1261 // All declarations for a function shall agree exactly in both the 1262 // return type and the parameter-type-list. 1263 // attributes should be ignored when comparing. 1264 if (Context.getNoReturnType(OldQType, false) == 1265 Context.getNoReturnType(NewQType, false)) 1266 return MergeCompatibleFunctionDecls(New, Old); 1267 1268 // Fall through for conflicting redeclarations and redefinitions. 1269 } 1270 1271 // C: Function types need to be compatible, not identical. This handles 1272 // duplicate function decls like "void f(int); void f(enum X);" properly. 1273 if (!getLangOptions().CPlusPlus && 1274 Context.typesAreCompatible(OldQType, NewQType)) { 1275 const FunctionType *OldFuncType = OldQType->getAs<FunctionType>(); 1276 const FunctionType *NewFuncType = NewQType->getAs<FunctionType>(); 1277 const FunctionProtoType *OldProto = 0; 1278 if (isa<FunctionNoProtoType>(NewFuncType) && 1279 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) { 1280 // The old declaration provided a function prototype, but the 1281 // new declaration does not. Merge in the prototype. 1282 assert(!OldProto->hasExceptionSpec() && "Exception spec in C"); 1283 llvm::SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(), 1284 OldProto->arg_type_end()); 1285 NewQType = Context.getFunctionType(NewFuncType->getResultType(), 1286 ParamTypes.data(), ParamTypes.size(), 1287 OldProto->isVariadic(), 1288 OldProto->getTypeQuals(), 1289 false, false, 0, 0, 1290 OldProto->getExtInfo()); 1291 New->setType(NewQType); 1292 New->setHasInheritedPrototype(); 1293 1294 // Synthesize a parameter for each argument type. 1295 llvm::SmallVector<ParmVarDecl*, 16> Params; 1296 for (FunctionProtoType::arg_type_iterator 1297 ParamType = OldProto->arg_type_begin(), 1298 ParamEnd = OldProto->arg_type_end(); 1299 ParamType != ParamEnd; ++ParamType) { 1300 ParmVarDecl *Param = ParmVarDecl::Create(Context, New, 1301 SourceLocation(), 0, 1302 *ParamType, /*TInfo=*/0, 1303 VarDecl::None, VarDecl::None, 1304 0); 1305 Param->setImplicit(); 1306 Params.push_back(Param); 1307 } 1308 1309 New->setParams(Params.data(), Params.size()); 1310 } 1311 1312 return MergeCompatibleFunctionDecls(New, Old); 1313 } 1314 1315 // GNU C permits a K&R definition to follow a prototype declaration 1316 // if the declared types of the parameters in the K&R definition 1317 // match the types in the prototype declaration, even when the 1318 // promoted types of the parameters from the K&R definition differ 1319 // from the types in the prototype. GCC then keeps the types from 1320 // the prototype. 1321 // 1322 // If a variadic prototype is followed by a non-variadic K&R definition, 1323 // the K&R definition becomes variadic. This is sort of an edge case, but 1324 // it's legal per the standard depending on how you read C99 6.7.5.3p15 and 1325 // C99 6.9.1p8. 1326 if (!getLangOptions().CPlusPlus && 1327 Old->hasPrototype() && !New->hasPrototype() && 1328 New->getType()->getAs<FunctionProtoType>() && 1329 Old->getNumParams() == New->getNumParams()) { 1330 llvm::SmallVector<QualType, 16> ArgTypes; 1331 llvm::SmallVector<GNUCompatibleParamWarning, 16> Warnings; 1332 const FunctionProtoType *OldProto 1333 = Old->getType()->getAs<FunctionProtoType>(); 1334 const FunctionProtoType *NewProto 1335 = New->getType()->getAs<FunctionProtoType>(); 1336 1337 // Determine whether this is the GNU C extension. 1338 QualType MergedReturn = Context.mergeTypes(OldProto->getResultType(), 1339 NewProto->getResultType()); 1340 bool LooseCompatible = !MergedReturn.isNull(); 1341 for (unsigned Idx = 0, End = Old->getNumParams(); 1342 LooseCompatible && Idx != End; ++Idx) { 1343 ParmVarDecl *OldParm = Old->getParamDecl(Idx); 1344 ParmVarDecl *NewParm = New->getParamDecl(Idx); 1345 if (Context.typesAreCompatible(OldParm->getType(), 1346 NewProto->getArgType(Idx))) { 1347 ArgTypes.push_back(NewParm->getType()); 1348 } else if (Context.typesAreCompatible(OldParm->getType(), 1349 NewParm->getType(), 1350 /*CompareUnqualified=*/true)) { 1351 GNUCompatibleParamWarning Warn 1352 = { OldParm, NewParm, NewProto->getArgType(Idx) }; 1353 Warnings.push_back(Warn); 1354 ArgTypes.push_back(NewParm->getType()); 1355 } else 1356 LooseCompatible = false; 1357 } 1358 1359 if (LooseCompatible) { 1360 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) { 1361 Diag(Warnings[Warn].NewParm->getLocation(), 1362 diag::ext_param_promoted_not_compatible_with_prototype) 1363 << Warnings[Warn].PromotedType 1364 << Warnings[Warn].OldParm->getType(); 1365 if (Warnings[Warn].OldParm->getLocation().isValid()) 1366 Diag(Warnings[Warn].OldParm->getLocation(), 1367 diag::note_previous_declaration); 1368 } 1369 1370 New->setType(Context.getFunctionType(MergedReturn, &ArgTypes[0], 1371 ArgTypes.size(), 1372 OldProto->isVariadic(), 0, 1373 false, false, 0, 0, 1374 OldProto->getExtInfo())); 1375 return MergeCompatibleFunctionDecls(New, Old); 1376 } 1377 1378 // Fall through to diagnose conflicting types. 1379 } 1380 1381 // A function that has already been declared has been redeclared or defined 1382 // with a different type- show appropriate diagnostic 1383 if (unsigned BuiltinID = Old->getBuiltinID()) { 1384 // The user has declared a builtin function with an incompatible 1385 // signature. 1386 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 1387 // The function the user is redeclaring is a library-defined 1388 // function like 'malloc' or 'printf'. Warn about the 1389 // redeclaration, then pretend that we don't know about this 1390 // library built-in. 1391 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; 1392 Diag(Old->getLocation(), diag::note_previous_builtin_declaration) 1393 << Old << Old->getType(); 1394 New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin); 1395 Old->setInvalidDecl(); 1396 return false; 1397 } 1398 1399 PrevDiag = diag::note_previous_builtin_declaration; 1400 } 1401 1402 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 1403 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1404 return true; 1405} 1406 1407/// \brief Completes the merge of two function declarations that are 1408/// known to be compatible. 1409/// 1410/// This routine handles the merging of attributes and other 1411/// properties of function declarations form the old declaration to 1412/// the new declaration, once we know that New is in fact a 1413/// redeclaration of Old. 1414/// 1415/// \returns false 1416bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old) { 1417 // Merge the attributes 1418 MergeDeclAttributes(New, Old, Context); 1419 1420 // Merge the storage class. 1421 if (Old->getStorageClass() != FunctionDecl::Extern && 1422 Old->getStorageClass() != FunctionDecl::None) 1423 New->setStorageClass(Old->getStorageClass()); 1424 1425 // Merge "pure" flag. 1426 if (Old->isPure()) 1427 New->setPure(); 1428 1429 // Merge the "deleted" flag. 1430 if (Old->isDeleted()) 1431 New->setDeleted(); 1432 1433 if (getLangOptions().CPlusPlus) 1434 return MergeCXXFunctionDecl(New, Old); 1435 1436 return false; 1437} 1438 1439/// MergeVarDecl - We just parsed a variable 'New' which has the same name 1440/// and scope as a previous declaration 'Old'. Figure out how to resolve this 1441/// situation, merging decls or emitting diagnostics as appropriate. 1442/// 1443/// Tentative definition rules (C99 6.9.2p2) are checked by 1444/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 1445/// definitions here, since the initializer hasn't been attached. 1446/// 1447void Sema::MergeVarDecl(VarDecl *New, LookupResult &Previous) { 1448 // If the new decl is already invalid, don't do any other checking. 1449 if (New->isInvalidDecl()) 1450 return; 1451 1452 // Verify the old decl was also a variable. 1453 VarDecl *Old = 0; 1454 if (!Previous.isSingleResult() || 1455 !(Old = dyn_cast<VarDecl>(Previous.getFoundDecl()))) { 1456 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1457 << New->getDeclName(); 1458 Diag(Previous.getRepresentativeDecl()->getLocation(), 1459 diag::note_previous_definition); 1460 return New->setInvalidDecl(); 1461 } 1462 1463 MergeDeclAttributes(New, Old, Context); 1464 1465 // Merge the types 1466 QualType MergedT; 1467 if (getLangOptions().CPlusPlus) { 1468 if (Context.hasSameType(New->getType(), Old->getType())) 1469 MergedT = New->getType(); 1470 // C++ [basic.link]p10: 1471 // [...] the types specified by all declarations referring to a given 1472 // object or function shall be identical, except that declarations for an 1473 // array object can specify array types that differ by the presence or 1474 // absence of a major array bound (8.3.4). 1475 else if (Old->getType()->isIncompleteArrayType() && 1476 New->getType()->isArrayType()) { 1477 CanQual<ArrayType> OldArray 1478 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 1479 CanQual<ArrayType> NewArray 1480 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 1481 if (OldArray->getElementType() == NewArray->getElementType()) 1482 MergedT = New->getType(); 1483 } else if (Old->getType()->isArrayType() && 1484 New->getType()->isIncompleteArrayType()) { 1485 CanQual<ArrayType> OldArray 1486 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 1487 CanQual<ArrayType> NewArray 1488 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 1489 if (OldArray->getElementType() == NewArray->getElementType()) 1490 MergedT = Old->getType(); 1491 } else if (New->getType()->isObjCObjectPointerType() 1492 && Old->getType()->isObjCObjectPointerType()) { 1493 MergedT = Context.mergeObjCGCQualifiers(New->getType(), Old->getType()); 1494 } 1495 } else { 1496 MergedT = Context.mergeTypes(New->getType(), Old->getType()); 1497 } 1498 if (MergedT.isNull()) { 1499 Diag(New->getLocation(), diag::err_redefinition_different_type) 1500 << New->getDeclName(); 1501 Diag(Old->getLocation(), diag::note_previous_definition); 1502 return New->setInvalidDecl(); 1503 } 1504 New->setType(MergedT); 1505 1506 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 1507 if (New->getStorageClass() == VarDecl::Static && 1508 (Old->getStorageClass() == VarDecl::None || Old->hasExternalStorage())) { 1509 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 1510 Diag(Old->getLocation(), diag::note_previous_definition); 1511 return New->setInvalidDecl(); 1512 } 1513 // C99 6.2.2p4: 1514 // For an identifier declared with the storage-class specifier 1515 // extern in a scope in which a prior declaration of that 1516 // identifier is visible,23) if the prior declaration specifies 1517 // internal or external linkage, the linkage of the identifier at 1518 // the later declaration is the same as the linkage specified at 1519 // the prior declaration. If no prior declaration is visible, or 1520 // if the prior declaration specifies no linkage, then the 1521 // identifier has external linkage. 1522 if (New->hasExternalStorage() && Old->hasLinkage()) 1523 /* Okay */; 1524 else if (New->getStorageClass() != VarDecl::Static && 1525 Old->getStorageClass() == VarDecl::Static) { 1526 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 1527 Diag(Old->getLocation(), diag::note_previous_definition); 1528 return New->setInvalidDecl(); 1529 } 1530 1531 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 1532 1533 // FIXME: The test for external storage here seems wrong? We still 1534 // need to check for mismatches. 1535 if (!New->hasExternalStorage() && !New->isFileVarDecl() && 1536 // Don't complain about out-of-line definitions of static members. 1537 !(Old->getLexicalDeclContext()->isRecord() && 1538 !New->getLexicalDeclContext()->isRecord())) { 1539 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 1540 Diag(Old->getLocation(), diag::note_previous_definition); 1541 return New->setInvalidDecl(); 1542 } 1543 1544 if (New->isThreadSpecified() && !Old->isThreadSpecified()) { 1545 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName(); 1546 Diag(Old->getLocation(), diag::note_previous_definition); 1547 } else if (!New->isThreadSpecified() && Old->isThreadSpecified()) { 1548 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName(); 1549 Diag(Old->getLocation(), diag::note_previous_definition); 1550 } 1551 1552 // C++ doesn't have tentative definitions, so go right ahead and check here. 1553 const VarDecl *Def; 1554 if (getLangOptions().CPlusPlus && 1555 New->isThisDeclarationADefinition() == VarDecl::Definition && 1556 (Def = Old->getDefinition())) { 1557 Diag(New->getLocation(), diag::err_redefinition) 1558 << New->getDeclName(); 1559 Diag(Def->getLocation(), diag::note_previous_definition); 1560 New->setInvalidDecl(); 1561 return; 1562 } 1563 // c99 6.2.2 P4. 1564 // For an identifier declared with the storage-class specifier extern in a 1565 // scope in which a prior declaration of that identifier is visible, if 1566 // the prior declaration specifies internal or external linkage, the linkage 1567 // of the identifier at the later declaration is the same as the linkage 1568 // specified at the prior declaration. 1569 // FIXME. revisit this code. 1570 if (New->hasExternalStorage() && 1571 Old->getLinkage() == InternalLinkage && 1572 New->getDeclContext() == Old->getDeclContext()) 1573 New->setStorageClass(Old->getStorageClass()); 1574 1575 // Keep a chain of previous declarations. 1576 New->setPreviousDeclaration(Old); 1577 1578 // Inherit access appropriately. 1579 New->setAccess(Old->getAccess()); 1580} 1581 1582/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 1583/// no declarator (e.g. "struct foo;") is parsed. 1584Sema::DeclPtrTy Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 1585 DeclSpec &DS) { 1586 // FIXME: Error on auto/register at file scope 1587 // FIXME: Error on inline/virtual/explicit 1588 // FIXME: Warn on useless __thread 1589 // FIXME: Warn on useless const/volatile 1590 // FIXME: Warn on useless static/extern/typedef/private_extern/mutable 1591 // FIXME: Warn on useless attributes 1592 Decl *TagD = 0; 1593 TagDecl *Tag = 0; 1594 if (DS.getTypeSpecType() == DeclSpec::TST_class || 1595 DS.getTypeSpecType() == DeclSpec::TST_struct || 1596 DS.getTypeSpecType() == DeclSpec::TST_union || 1597 DS.getTypeSpecType() == DeclSpec::TST_enum) { 1598 TagD = static_cast<Decl *>(DS.getTypeRep()); 1599 1600 if (!TagD) // We probably had an error 1601 return DeclPtrTy(); 1602 1603 // Note that the above type specs guarantee that the 1604 // type rep is a Decl, whereas in many of the others 1605 // it's a Type. 1606 Tag = dyn_cast<TagDecl>(TagD); 1607 } 1608 1609 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 1610 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 1611 // or incomplete types shall not be restrict-qualified." 1612 if (TypeQuals & DeclSpec::TQ_restrict) 1613 Diag(DS.getRestrictSpecLoc(), 1614 diag::err_typecheck_invalid_restrict_not_pointer_noarg) 1615 << DS.getSourceRange(); 1616 } 1617 1618 if (DS.isFriendSpecified()) { 1619 // If we're dealing with a class template decl, assume that the 1620 // template routines are handling it. 1621 if (TagD && isa<ClassTemplateDecl>(TagD)) 1622 return DeclPtrTy(); 1623 return ActOnFriendTypeDecl(S, DS, MultiTemplateParamsArg(*this, 0, 0)); 1624 } 1625 1626 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 1627 ProcessDeclAttributeList(S, Record, DS.getAttributes()); 1628 1629 if (!Record->getDeclName() && Record->isDefinition() && 1630 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { 1631 if (getLangOptions().CPlusPlus || 1632 Record->getDeclContext()->isRecord()) 1633 return BuildAnonymousStructOrUnion(S, DS, AS, Record); 1634 1635 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 1636 << DS.getSourceRange(); 1637 } 1638 1639 // Microsoft allows unnamed struct/union fields. Don't complain 1640 // about them. 1641 // FIXME: Should we support Microsoft's extensions in this area? 1642 if (Record->getDeclName() && getLangOptions().Microsoft) 1643 return DeclPtrTy::make(Tag); 1644 } 1645 1646 if (getLangOptions().CPlusPlus && 1647 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) 1648 if (EnumDecl *Enum = dyn_cast_or_null<EnumDecl>(Tag)) 1649 if (Enum->enumerator_begin() == Enum->enumerator_end() && 1650 !Enum->getIdentifier() && !Enum->isInvalidDecl()) 1651 Diag(Enum->getLocation(), diag::ext_no_declarators) 1652 << DS.getSourceRange(); 1653 1654 if (!DS.isMissingDeclaratorOk() && 1655 DS.getTypeSpecType() != DeclSpec::TST_error) { 1656 // Warn about typedefs of enums without names, since this is an 1657 // extension in both Microsoft and GNU. 1658 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 1659 Tag && isa<EnumDecl>(Tag)) { 1660 Diag(DS.getSourceRange().getBegin(), diag::ext_typedef_without_a_name) 1661 << DS.getSourceRange(); 1662 return DeclPtrTy::make(Tag); 1663 } 1664 1665 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 1666 << DS.getSourceRange(); 1667 } 1668 1669 return DeclPtrTy::make(TagD); 1670} 1671 1672/// We are trying to inject an anonymous member into the given scope; 1673/// check if there's an existing declaration that can't be overloaded. 1674/// 1675/// \return true if this is a forbidden redeclaration 1676static bool CheckAnonMemberRedeclaration(Sema &SemaRef, 1677 Scope *S, 1678 DeclContext *Owner, 1679 DeclarationName Name, 1680 SourceLocation NameLoc, 1681 unsigned diagnostic) { 1682 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupMemberName, 1683 Sema::ForRedeclaration); 1684 if (!SemaRef.LookupName(R, S)) return false; 1685 1686 if (R.getAsSingle<TagDecl>()) 1687 return false; 1688 1689 // Pick a representative declaration. 1690 NamedDecl *PrevDecl = R.getRepresentativeDecl()->getUnderlyingDecl(); 1691 if (PrevDecl && Owner->isRecord()) { 1692 RecordDecl *Record = cast<RecordDecl>(Owner); 1693 if (!SemaRef.isDeclInScope(PrevDecl, Record, S)) 1694 return false; 1695 } 1696 1697 SemaRef.Diag(NameLoc, diagnostic) << Name; 1698 SemaRef.Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 1699 1700 return true; 1701} 1702 1703/// InjectAnonymousStructOrUnionMembers - Inject the members of the 1704/// anonymous struct or union AnonRecord into the owning context Owner 1705/// and scope S. This routine will be invoked just after we realize 1706/// that an unnamed union or struct is actually an anonymous union or 1707/// struct, e.g., 1708/// 1709/// @code 1710/// union { 1711/// int i; 1712/// float f; 1713/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 1714/// // f into the surrounding scope.x 1715/// @endcode 1716/// 1717/// This routine is recursive, injecting the names of nested anonymous 1718/// structs/unions into the owning context and scope as well. 1719static bool InjectAnonymousStructOrUnionMembers(Sema &SemaRef, Scope *S, 1720 DeclContext *Owner, 1721 RecordDecl *AnonRecord, 1722 AccessSpecifier AS) { 1723 unsigned diagKind 1724 = AnonRecord->isUnion() ? diag::err_anonymous_union_member_redecl 1725 : diag::err_anonymous_struct_member_redecl; 1726 1727 bool Invalid = false; 1728 for (RecordDecl::field_iterator F = AnonRecord->field_begin(), 1729 FEnd = AnonRecord->field_end(); 1730 F != FEnd; ++F) { 1731 if ((*F)->getDeclName()) { 1732 if (CheckAnonMemberRedeclaration(SemaRef, S, Owner, (*F)->getDeclName(), 1733 (*F)->getLocation(), diagKind)) { 1734 // C++ [class.union]p2: 1735 // The names of the members of an anonymous union shall be 1736 // distinct from the names of any other entity in the 1737 // scope in which the anonymous union is declared. 1738 Invalid = true; 1739 } else { 1740 // C++ [class.union]p2: 1741 // For the purpose of name lookup, after the anonymous union 1742 // definition, the members of the anonymous union are 1743 // considered to have been defined in the scope in which the 1744 // anonymous union is declared. 1745 Owner->makeDeclVisibleInContext(*F); 1746 S->AddDecl(Sema::DeclPtrTy::make(*F)); 1747 SemaRef.IdResolver.AddDecl(*F); 1748 1749 // That includes picking up the appropriate access specifier. 1750 if (AS != AS_none) (*F)->setAccess(AS); 1751 } 1752 } else if (const RecordType *InnerRecordType 1753 = (*F)->getType()->getAs<RecordType>()) { 1754 RecordDecl *InnerRecord = InnerRecordType->getDecl(); 1755 if (InnerRecord->isAnonymousStructOrUnion()) 1756 Invalid = Invalid || 1757 InjectAnonymousStructOrUnionMembers(SemaRef, S, Owner, 1758 InnerRecord, AS); 1759 } 1760 } 1761 1762 return Invalid; 1763} 1764 1765/// StorageClassSpecToVarDeclStorageClass - Maps a DeclSpec::SCS to 1766/// a VarDecl::StorageClass. Any error reporting is up to the caller: 1767/// illegal input values are mapped to VarDecl::None. 1768static VarDecl::StorageClass 1769StorageClassSpecToVarDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 1770 switch (StorageClassSpec) { 1771 case DeclSpec::SCS_unspecified: return VarDecl::None; 1772 case DeclSpec::SCS_extern: return VarDecl::Extern; 1773 case DeclSpec::SCS_static: return VarDecl::Static; 1774 case DeclSpec::SCS_auto: return VarDecl::Auto; 1775 case DeclSpec::SCS_register: return VarDecl::Register; 1776 case DeclSpec::SCS_private_extern: return VarDecl::PrivateExtern; 1777 // Illegal SCSs map to None: error reporting is up to the caller. 1778 case DeclSpec::SCS_mutable: // Fall through. 1779 case DeclSpec::SCS_typedef: return VarDecl::None; 1780 } 1781 llvm_unreachable("unknown storage class specifier"); 1782} 1783 1784/// StorageClassSpecToFunctionDeclStorageClass - Maps a DeclSpec::SCS to 1785/// a FunctionDecl::StorageClass. Any error reporting is up to the caller: 1786/// illegal input values are mapped to FunctionDecl::None. 1787static FunctionDecl::StorageClass 1788StorageClassSpecToFunctionDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 1789 switch (StorageClassSpec) { 1790 case DeclSpec::SCS_unspecified: return FunctionDecl::None; 1791 case DeclSpec::SCS_extern: return FunctionDecl::Extern; 1792 case DeclSpec::SCS_static: return FunctionDecl::Static; 1793 case DeclSpec::SCS_private_extern: return FunctionDecl::PrivateExtern; 1794 // Illegal SCSs map to None: error reporting is up to the caller. 1795 case DeclSpec::SCS_auto: // Fall through. 1796 case DeclSpec::SCS_mutable: // Fall through. 1797 case DeclSpec::SCS_register: // Fall through. 1798 case DeclSpec::SCS_typedef: return FunctionDecl::None; 1799 } 1800 llvm_unreachable("unknown storage class specifier"); 1801} 1802 1803/// ActOnAnonymousStructOrUnion - Handle the declaration of an 1804/// anonymous structure or union. Anonymous unions are a C++ feature 1805/// (C++ [class.union]) and a GNU C extension; anonymous structures 1806/// are a GNU C and GNU C++ extension. 1807Sema::DeclPtrTy Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 1808 AccessSpecifier AS, 1809 RecordDecl *Record) { 1810 DeclContext *Owner = Record->getDeclContext(); 1811 1812 // Diagnose whether this anonymous struct/union is an extension. 1813 if (Record->isUnion() && !getLangOptions().CPlusPlus) 1814 Diag(Record->getLocation(), diag::ext_anonymous_union); 1815 else if (!Record->isUnion()) 1816 Diag(Record->getLocation(), diag::ext_anonymous_struct); 1817 1818 // C and C++ require different kinds of checks for anonymous 1819 // structs/unions. 1820 bool Invalid = false; 1821 if (getLangOptions().CPlusPlus) { 1822 const char* PrevSpec = 0; 1823 unsigned DiagID; 1824 // C++ [class.union]p3: 1825 // Anonymous unions declared in a named namespace or in the 1826 // global namespace shall be declared static. 1827 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 1828 (isa<TranslationUnitDecl>(Owner) || 1829 (isa<NamespaceDecl>(Owner) && 1830 cast<NamespaceDecl>(Owner)->getDeclName()))) { 1831 Diag(Record->getLocation(), diag::err_anonymous_union_not_static); 1832 Invalid = true; 1833 1834 // Recover by adding 'static'. 1835 DS.SetStorageClassSpec(DeclSpec::SCS_static, SourceLocation(), 1836 PrevSpec, DiagID); 1837 } 1838 // C++ [class.union]p3: 1839 // A storage class is not allowed in a declaration of an 1840 // anonymous union in a class scope. 1841 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 1842 isa<RecordDecl>(Owner)) { 1843 Diag(DS.getStorageClassSpecLoc(), 1844 diag::err_anonymous_union_with_storage_spec); 1845 Invalid = true; 1846 1847 // Recover by removing the storage specifier. 1848 DS.SetStorageClassSpec(DeclSpec::SCS_unspecified, SourceLocation(), 1849 PrevSpec, DiagID); 1850 } 1851 1852 // C++ [class.union]p2: 1853 // The member-specification of an anonymous union shall only 1854 // define non-static data members. [Note: nested types and 1855 // functions cannot be declared within an anonymous union. ] 1856 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 1857 MemEnd = Record->decls_end(); 1858 Mem != MemEnd; ++Mem) { 1859 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 1860 // C++ [class.union]p3: 1861 // An anonymous union shall not have private or protected 1862 // members (clause 11). 1863 assert(FD->getAccess() != AS_none); 1864 if (FD->getAccess() != AS_public) { 1865 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 1866 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 1867 Invalid = true; 1868 } 1869 1870 if (CheckNontrivialField(FD)) 1871 Invalid = true; 1872 } else if ((*Mem)->isImplicit()) { 1873 // Any implicit members are fine. 1874 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 1875 // This is a type that showed up in an 1876 // elaborated-type-specifier inside the anonymous struct or 1877 // union, but which actually declares a type outside of the 1878 // anonymous struct or union. It's okay. 1879 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 1880 if (!MemRecord->isAnonymousStructOrUnion() && 1881 MemRecord->getDeclName()) { 1882 // This is a nested type declaration. 1883 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 1884 << (int)Record->isUnion(); 1885 Invalid = true; 1886 } 1887 } else if (isa<AccessSpecDecl>(*Mem)) { 1888 // Any access specifier is fine. 1889 } else { 1890 // We have something that isn't a non-static data 1891 // member. Complain about it. 1892 unsigned DK = diag::err_anonymous_record_bad_member; 1893 if (isa<TypeDecl>(*Mem)) 1894 DK = diag::err_anonymous_record_with_type; 1895 else if (isa<FunctionDecl>(*Mem)) 1896 DK = diag::err_anonymous_record_with_function; 1897 else if (isa<VarDecl>(*Mem)) 1898 DK = diag::err_anonymous_record_with_static; 1899 Diag((*Mem)->getLocation(), DK) 1900 << (int)Record->isUnion(); 1901 Invalid = true; 1902 } 1903 } 1904 } 1905 1906 if (!Record->isUnion() && !Owner->isRecord()) { 1907 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 1908 << (int)getLangOptions().CPlusPlus; 1909 Invalid = true; 1910 } 1911 1912 // Mock up a declarator. 1913 Declarator Dc(DS, Declarator::TypeNameContext); 1914 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 1915 assert(TInfo && "couldn't build declarator info for anonymous struct/union"); 1916 1917 // Create a declaration for this anonymous struct/union. 1918 NamedDecl *Anon = 0; 1919 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 1920 Anon = FieldDecl::Create(Context, OwningClass, Record->getLocation(), 1921 /*IdentifierInfo=*/0, 1922 Context.getTypeDeclType(Record), 1923 TInfo, 1924 /*BitWidth=*/0, /*Mutable=*/false); 1925 Anon->setAccess(AS); 1926 if (getLangOptions().CPlusPlus) { 1927 FieldCollector->Add(cast<FieldDecl>(Anon)); 1928 if (!cast<CXXRecordDecl>(Record)->isEmpty()) 1929 cast<CXXRecordDecl>(OwningClass)->setEmpty(false); 1930 } 1931 } else { 1932 DeclSpec::SCS SCSpec = DS.getStorageClassSpec(); 1933 assert(SCSpec != DeclSpec::SCS_typedef && 1934 "Parser allowed 'typedef' as storage class VarDecl."); 1935 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 1936 if (SCSpec == DeclSpec::SCS_mutable) { 1937 // mutable can only appear on non-static class members, so it's always 1938 // an error here 1939 Diag(Record->getLocation(), diag::err_mutable_nonmember); 1940 Invalid = true; 1941 SC = VarDecl::None; 1942 } 1943 SCSpec = DS.getStorageClassSpecAsWritten(); 1944 VarDecl::StorageClass SCAsWritten 1945 = StorageClassSpecToVarDeclStorageClass(SCSpec); 1946 1947 Anon = VarDecl::Create(Context, Owner, Record->getLocation(), 1948 /*IdentifierInfo=*/0, 1949 Context.getTypeDeclType(Record), 1950 TInfo, SC, SCAsWritten); 1951 } 1952 Anon->setImplicit(); 1953 1954 // Add the anonymous struct/union object to the current 1955 // context. We'll be referencing this object when we refer to one of 1956 // its members. 1957 Owner->addDecl(Anon); 1958 1959 // Inject the members of the anonymous struct/union into the owning 1960 // context and into the identifier resolver chain for name lookup 1961 // purposes. 1962 if (InjectAnonymousStructOrUnionMembers(*this, S, Owner, Record, AS)) 1963 Invalid = true; 1964 1965 // Mark this as an anonymous struct/union type. Note that we do not 1966 // do this until after we have already checked and injected the 1967 // members of this anonymous struct/union type, because otherwise 1968 // the members could be injected twice: once by DeclContext when it 1969 // builds its lookup table, and once by 1970 // InjectAnonymousStructOrUnionMembers. 1971 Record->setAnonymousStructOrUnion(true); 1972 1973 if (Invalid) 1974 Anon->setInvalidDecl(); 1975 1976 return DeclPtrTy::make(Anon); 1977} 1978 1979 1980/// GetNameForDeclarator - Determine the full declaration name for the 1981/// given Declarator. 1982DeclarationNameInfo Sema::GetNameForDeclarator(Declarator &D) { 1983 return GetNameFromUnqualifiedId(D.getName()); 1984} 1985 1986/// \brief Retrieves the declaration name from a parsed unqualified-id. 1987DeclarationNameInfo 1988Sema::GetNameFromUnqualifiedId(const UnqualifiedId &Name) { 1989 DeclarationNameInfo NameInfo; 1990 NameInfo.setLoc(Name.StartLocation); 1991 1992 switch (Name.getKind()) { 1993 1994 case UnqualifiedId::IK_Identifier: 1995 NameInfo.setName(Name.Identifier); 1996 NameInfo.setLoc(Name.StartLocation); 1997 return NameInfo; 1998 1999 case UnqualifiedId::IK_OperatorFunctionId: 2000 NameInfo.setName(Context.DeclarationNames.getCXXOperatorName( 2001 Name.OperatorFunctionId.Operator)); 2002 NameInfo.setLoc(Name.StartLocation); 2003 NameInfo.getInfo().CXXOperatorName.BeginOpNameLoc 2004 = Name.OperatorFunctionId.SymbolLocations[0]; 2005 NameInfo.getInfo().CXXOperatorName.EndOpNameLoc 2006 = Name.EndLocation.getRawEncoding(); 2007 return NameInfo; 2008 2009 case UnqualifiedId::IK_LiteralOperatorId: 2010 NameInfo.setName(Context.DeclarationNames.getCXXLiteralOperatorName( 2011 Name.Identifier)); 2012 NameInfo.setLoc(Name.StartLocation); 2013 NameInfo.setCXXLiteralOperatorNameLoc(Name.EndLocation); 2014 return NameInfo; 2015 2016 case UnqualifiedId::IK_ConversionFunctionId: { 2017 TypeSourceInfo *TInfo; 2018 QualType Ty = GetTypeFromParser(Name.ConversionFunctionId, &TInfo); 2019 if (Ty.isNull()) 2020 return DeclarationNameInfo(); 2021 NameInfo.setName(Context.DeclarationNames.getCXXConversionFunctionName( 2022 Context.getCanonicalType(Ty))); 2023 NameInfo.setLoc(Name.StartLocation); 2024 NameInfo.setNamedTypeInfo(TInfo); 2025 return NameInfo; 2026 } 2027 2028 case UnqualifiedId::IK_ConstructorName: { 2029 TypeSourceInfo *TInfo; 2030 QualType Ty = GetTypeFromParser(Name.ConstructorName, &TInfo); 2031 if (Ty.isNull()) 2032 return DeclarationNameInfo(); 2033 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 2034 Context.getCanonicalType(Ty))); 2035 NameInfo.setLoc(Name.StartLocation); 2036 NameInfo.setNamedTypeInfo(TInfo); 2037 return NameInfo; 2038 } 2039 2040 case UnqualifiedId::IK_ConstructorTemplateId: { 2041 // In well-formed code, we can only have a constructor 2042 // template-id that refers to the current context, so go there 2043 // to find the actual type being constructed. 2044 CXXRecordDecl *CurClass = dyn_cast<CXXRecordDecl>(CurContext); 2045 if (!CurClass || CurClass->getIdentifier() != Name.TemplateId->Name) 2046 return DeclarationNameInfo(); 2047 2048 // Determine the type of the class being constructed. 2049 QualType CurClassType = Context.getTypeDeclType(CurClass); 2050 2051 // FIXME: Check two things: that the template-id names the same type as 2052 // CurClassType, and that the template-id does not occur when the name 2053 // was qualified. 2054 2055 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 2056 Context.getCanonicalType(CurClassType))); 2057 NameInfo.setLoc(Name.StartLocation); 2058 // FIXME: should we retrieve TypeSourceInfo? 2059 NameInfo.setNamedTypeInfo(0); 2060 return NameInfo; 2061 } 2062 2063 case UnqualifiedId::IK_DestructorName: { 2064 TypeSourceInfo *TInfo; 2065 QualType Ty = GetTypeFromParser(Name.DestructorName, &TInfo); 2066 if (Ty.isNull()) 2067 return DeclarationNameInfo(); 2068 NameInfo.setName(Context.DeclarationNames.getCXXDestructorName( 2069 Context.getCanonicalType(Ty))); 2070 NameInfo.setLoc(Name.StartLocation); 2071 NameInfo.setNamedTypeInfo(TInfo); 2072 return NameInfo; 2073 } 2074 2075 case UnqualifiedId::IK_TemplateId: { 2076 TemplateName TName 2077 = TemplateName::getFromVoidPointer(Name.TemplateId->Template); 2078 SourceLocation TNameLoc = Name.TemplateId->TemplateNameLoc; 2079 return Context.getNameForTemplate(TName, TNameLoc); 2080 } 2081 2082 } // switch (Name.getKind()) 2083 2084 assert(false && "Unknown name kind"); 2085 return DeclarationNameInfo(); 2086} 2087 2088/// isNearlyMatchingFunction - Determine whether the C++ functions 2089/// Declaration and Definition are "nearly" matching. This heuristic 2090/// is used to improve diagnostics in the case where an out-of-line 2091/// function definition doesn't match any declaration within 2092/// the class or namespace. 2093static bool isNearlyMatchingFunction(ASTContext &Context, 2094 FunctionDecl *Declaration, 2095 FunctionDecl *Definition) { 2096 if (Declaration->param_size() != Definition->param_size()) 2097 return false; 2098 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 2099 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 2100 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 2101 2102 if (!Context.hasSameUnqualifiedType(DeclParamTy.getNonReferenceType(), 2103 DefParamTy.getNonReferenceType())) 2104 return false; 2105 } 2106 2107 return true; 2108} 2109 2110/// NeedsRebuildingInCurrentInstantiation - Checks whether the given 2111/// declarator needs to be rebuilt in the current instantiation. 2112/// Any bits of declarator which appear before the name are valid for 2113/// consideration here. That's specifically the type in the decl spec 2114/// and the base type in any member-pointer chunks. 2115static bool RebuildDeclaratorInCurrentInstantiation(Sema &S, Declarator &D, 2116 DeclarationName Name) { 2117 // The types we specifically need to rebuild are: 2118 // - typenames, typeofs, and decltypes 2119 // - types which will become injected class names 2120 // Of course, we also need to rebuild any type referencing such a 2121 // type. It's safest to just say "dependent", but we call out a 2122 // few cases here. 2123 2124 DeclSpec &DS = D.getMutableDeclSpec(); 2125 switch (DS.getTypeSpecType()) { 2126 case DeclSpec::TST_typename: 2127 case DeclSpec::TST_typeofType: 2128 case DeclSpec::TST_typeofExpr: 2129 case DeclSpec::TST_decltype: { 2130 // Grab the type from the parser. 2131 TypeSourceInfo *TSI = 0; 2132 QualType T = S.GetTypeFromParser(DS.getTypeRep(), &TSI); 2133 if (T.isNull() || !T->isDependentType()) break; 2134 2135 // Make sure there's a type source info. This isn't really much 2136 // of a waste; most dependent types should have type source info 2137 // attached already. 2138 if (!TSI) 2139 TSI = S.Context.getTrivialTypeSourceInfo(T, DS.getTypeSpecTypeLoc()); 2140 2141 // Rebuild the type in the current instantiation. 2142 TSI = S.RebuildTypeInCurrentInstantiation(TSI, D.getIdentifierLoc(), Name); 2143 if (!TSI) return true; 2144 2145 // Store the new type back in the decl spec. 2146 QualType LocType = S.CreateLocInfoType(TSI->getType(), TSI); 2147 DS.UpdateTypeRep(LocType.getAsOpaquePtr()); 2148 break; 2149 } 2150 2151 default: 2152 // Nothing to do for these decl specs. 2153 break; 2154 } 2155 2156 // It doesn't matter what order we do this in. 2157 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) { 2158 DeclaratorChunk &Chunk = D.getTypeObject(I); 2159 2160 // The only type information in the declarator which can come 2161 // before the declaration name is the base type of a member 2162 // pointer. 2163 if (Chunk.Kind != DeclaratorChunk::MemberPointer) 2164 continue; 2165 2166 // Rebuild the scope specifier in-place. 2167 CXXScopeSpec &SS = Chunk.Mem.Scope(); 2168 if (S.RebuildNestedNameSpecifierInCurrentInstantiation(SS)) 2169 return true; 2170 } 2171 2172 return false; 2173} 2174 2175Sema::DeclPtrTy 2176Sema::HandleDeclarator(Scope *S, Declarator &D, 2177 MultiTemplateParamsArg TemplateParamLists, 2178 bool IsFunctionDefinition) { 2179 // TODO: consider using NameInfo for diagnostic. 2180 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 2181 DeclarationName Name = NameInfo.getName(); 2182 2183 // All of these full declarators require an identifier. If it doesn't have 2184 // one, the ParsedFreeStandingDeclSpec action should be used. 2185 if (!Name) { 2186 if (!D.isInvalidType()) // Reject this if we think it is valid. 2187 Diag(D.getDeclSpec().getSourceRange().getBegin(), 2188 diag::err_declarator_need_ident) 2189 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 2190 return DeclPtrTy(); 2191 } 2192 2193 // The scope passed in may not be a decl scope. Zip up the scope tree until 2194 // we find one that is. 2195 while ((S->getFlags() & Scope::DeclScope) == 0 || 2196 (S->getFlags() & Scope::TemplateParamScope) != 0) 2197 S = S->getParent(); 2198 2199 DeclContext *DC = CurContext; 2200 if (D.getCXXScopeSpec().isInvalid()) 2201 D.setInvalidType(); 2202 else if (D.getCXXScopeSpec().isSet()) { 2203 bool EnteringContext = !D.getDeclSpec().isFriendSpecified(); 2204 DC = computeDeclContext(D.getCXXScopeSpec(), EnteringContext); 2205 if (!DC) { 2206 // If we could not compute the declaration context, it's because the 2207 // declaration context is dependent but does not refer to a class, 2208 // class template, or class template partial specialization. Complain 2209 // and return early, to avoid the coming semantic disaster. 2210 Diag(D.getIdentifierLoc(), 2211 diag::err_template_qualified_declarator_no_match) 2212 << (NestedNameSpecifier*)D.getCXXScopeSpec().getScopeRep() 2213 << D.getCXXScopeSpec().getRange(); 2214 return DeclPtrTy(); 2215 } 2216 2217 bool IsDependentContext = DC->isDependentContext(); 2218 2219 if (!IsDependentContext && 2220 RequireCompleteDeclContext(D.getCXXScopeSpec(), DC)) 2221 return DeclPtrTy(); 2222 2223 if (isa<CXXRecordDecl>(DC) && !cast<CXXRecordDecl>(DC)->hasDefinition()) { 2224 Diag(D.getIdentifierLoc(), 2225 diag::err_member_def_undefined_record) 2226 << Name << DC << D.getCXXScopeSpec().getRange(); 2227 D.setInvalidType(); 2228 } 2229 2230 // Check whether we need to rebuild the type of the given 2231 // declaration in the current instantiation. 2232 if (EnteringContext && IsDependentContext && 2233 TemplateParamLists.size() != 0) { 2234 ContextRAII SavedContext(*this, DC); 2235 if (RebuildDeclaratorInCurrentInstantiation(*this, D, Name)) 2236 D.setInvalidType(); 2237 } 2238 } 2239 2240 NamedDecl *New; 2241 2242 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 2243 QualType R = TInfo->getType(); 2244 2245 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 2246 ForRedeclaration); 2247 2248 // See if this is a redefinition of a variable in the same scope. 2249 if (!D.getCXXScopeSpec().isSet()) { 2250 bool IsLinkageLookup = false; 2251 2252 // If the declaration we're planning to build will be a function 2253 // or object with linkage, then look for another declaration with 2254 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 2255 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 2256 /* Do nothing*/; 2257 else if (R->isFunctionType()) { 2258 if (CurContext->isFunctionOrMethod() || 2259 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 2260 IsLinkageLookup = true; 2261 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 2262 IsLinkageLookup = true; 2263 else if (CurContext->getLookupContext()->isTranslationUnit() && 2264 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 2265 IsLinkageLookup = true; 2266 2267 if (IsLinkageLookup) 2268 Previous.clear(LookupRedeclarationWithLinkage); 2269 2270 LookupName(Previous, S, /* CreateBuiltins = */ IsLinkageLookup); 2271 } else { // Something like "int foo::x;" 2272 LookupQualifiedName(Previous, DC); 2273 2274 // Don't consider using declarations as previous declarations for 2275 // out-of-line members. 2276 RemoveUsingDecls(Previous); 2277 2278 // C++ 7.3.1.2p2: 2279 // Members (including explicit specializations of templates) of a named 2280 // namespace can also be defined outside that namespace by explicit 2281 // qualification of the name being defined, provided that the entity being 2282 // defined was already declared in the namespace and the definition appears 2283 // after the point of declaration in a namespace that encloses the 2284 // declarations namespace. 2285 // 2286 // Note that we only check the context at this point. We don't yet 2287 // have enough information to make sure that PrevDecl is actually 2288 // the declaration we want to match. For example, given: 2289 // 2290 // class X { 2291 // void f(); 2292 // void f(float); 2293 // }; 2294 // 2295 // void X::f(int) { } // ill-formed 2296 // 2297 // In this case, PrevDecl will point to the overload set 2298 // containing the two f's declared in X, but neither of them 2299 // matches. 2300 2301 // First check whether we named the global scope. 2302 if (isa<TranslationUnitDecl>(DC)) { 2303 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 2304 << Name << D.getCXXScopeSpec().getRange(); 2305 } else { 2306 DeclContext *Cur = CurContext; 2307 while (isa<LinkageSpecDecl>(Cur)) 2308 Cur = Cur->getParent(); 2309 if (!Cur->Encloses(DC)) { 2310 // The qualifying scope doesn't enclose the original declaration. 2311 // Emit diagnostic based on current scope. 2312 SourceLocation L = D.getIdentifierLoc(); 2313 SourceRange R = D.getCXXScopeSpec().getRange(); 2314 if (isa<FunctionDecl>(Cur)) 2315 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 2316 else 2317 Diag(L, diag::err_invalid_declarator_scope) 2318 << Name << cast<NamedDecl>(DC) << R; 2319 D.setInvalidType(); 2320 } 2321 } 2322 } 2323 2324 if (Previous.isSingleResult() && 2325 Previous.getFoundDecl()->isTemplateParameter()) { 2326 // Maybe we will complain about the shadowed template parameter. 2327 if (!D.isInvalidType()) 2328 if (DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), 2329 Previous.getFoundDecl())) 2330 D.setInvalidType(); 2331 2332 // Just pretend that we didn't see the previous declaration. 2333 Previous.clear(); 2334 } 2335 2336 // In C++, the previous declaration we find might be a tag type 2337 // (class or enum). In this case, the new declaration will hide the 2338 // tag type. Note that this does does not apply if we're declaring a 2339 // typedef (C++ [dcl.typedef]p4). 2340 if (Previous.isSingleTagDecl() && 2341 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 2342 Previous.clear(); 2343 2344 bool Redeclaration = false; 2345 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 2346 if (TemplateParamLists.size()) { 2347 Diag(D.getIdentifierLoc(), diag::err_template_typedef); 2348 return DeclPtrTy(); 2349 } 2350 2351 New = ActOnTypedefDeclarator(S, D, DC, R, TInfo, Previous, Redeclaration); 2352 } else if (R->isFunctionType()) { 2353 New = ActOnFunctionDeclarator(S, D, DC, R, TInfo, Previous, 2354 move(TemplateParamLists), 2355 IsFunctionDefinition, Redeclaration); 2356 } else { 2357 New = ActOnVariableDeclarator(S, D, DC, R, TInfo, Previous, 2358 move(TemplateParamLists), 2359 Redeclaration); 2360 } 2361 2362 if (New == 0) 2363 return DeclPtrTy(); 2364 2365 // If this has an identifier and is not an invalid redeclaration or 2366 // function template specialization, add it to the scope stack. 2367 if (New->getDeclName() && !(Redeclaration && New->isInvalidDecl())) 2368 PushOnScopeChains(New, S); 2369 2370 return DeclPtrTy::make(New); 2371} 2372 2373/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 2374/// types into constant array types in certain situations which would otherwise 2375/// be errors (for GCC compatibility). 2376static QualType TryToFixInvalidVariablyModifiedType(QualType T, 2377 ASTContext &Context, 2378 bool &SizeIsNegative, 2379 llvm::APSInt &Oversized) { 2380 // This method tries to turn a variable array into a constant 2381 // array even when the size isn't an ICE. This is necessary 2382 // for compatibility with code that depends on gcc's buggy 2383 // constant expression folding, like struct {char x[(int)(char*)2];} 2384 SizeIsNegative = false; 2385 Oversized = 0; 2386 2387 if (T->isDependentType()) 2388 return QualType(); 2389 2390 QualifierCollector Qs; 2391 const Type *Ty = Qs.strip(T); 2392 2393 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) { 2394 QualType Pointee = PTy->getPointeeType(); 2395 QualType FixedType = 2396 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative, 2397 Oversized); 2398 if (FixedType.isNull()) return FixedType; 2399 FixedType = Context.getPointerType(FixedType); 2400 return Qs.apply(FixedType); 2401 } 2402 2403 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 2404 if (!VLATy) 2405 return QualType(); 2406 // FIXME: We should probably handle this case 2407 if (VLATy->getElementType()->isVariablyModifiedType()) 2408 return QualType(); 2409 2410 Expr::EvalResult EvalResult; 2411 if (!VLATy->getSizeExpr() || 2412 !VLATy->getSizeExpr()->Evaluate(EvalResult, Context) || 2413 !EvalResult.Val.isInt()) 2414 return QualType(); 2415 2416 // Check whether the array size is negative. 2417 llvm::APSInt &Res = EvalResult.Val.getInt(); 2418 if (Res.isSigned() && Res.isNegative()) { 2419 SizeIsNegative = true; 2420 return QualType(); 2421 } 2422 2423 // Check whether the array is too large to be addressed. 2424 unsigned ActiveSizeBits 2425 = ConstantArrayType::getNumAddressingBits(Context, VLATy->getElementType(), 2426 Res); 2427 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) { 2428 Oversized = Res; 2429 return QualType(); 2430 } 2431 2432 return Context.getConstantArrayType(VLATy->getElementType(), 2433 Res, ArrayType::Normal, 0); 2434} 2435 2436/// \brief Register the given locally-scoped external C declaration so 2437/// that it can be found later for redeclarations 2438void 2439Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, 2440 const LookupResult &Previous, 2441 Scope *S) { 2442 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 2443 "Decl is not a locally-scoped decl!"); 2444 // Note that we have a locally-scoped external with this name. 2445 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 2446 2447 if (!Previous.isSingleResult()) 2448 return; 2449 2450 NamedDecl *PrevDecl = Previous.getFoundDecl(); 2451 2452 // If there was a previous declaration of this variable, it may be 2453 // in our identifier chain. Update the identifier chain with the new 2454 // declaration. 2455 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 2456 // The previous declaration was found on the identifer resolver 2457 // chain, so remove it from its scope. 2458 while (S && !S->isDeclScope(DeclPtrTy::make(PrevDecl))) 2459 S = S->getParent(); 2460 2461 if (S) 2462 S->RemoveDecl(DeclPtrTy::make(PrevDecl)); 2463 } 2464} 2465 2466/// \brief Diagnose function specifiers on a declaration of an identifier that 2467/// does not identify a function. 2468void Sema::DiagnoseFunctionSpecifiers(Declarator& D) { 2469 // FIXME: We should probably indicate the identifier in question to avoid 2470 // confusion for constructs like "inline int a(), b;" 2471 if (D.getDeclSpec().isInlineSpecified()) 2472 Diag(D.getDeclSpec().getInlineSpecLoc(), 2473 diag::err_inline_non_function); 2474 2475 if (D.getDeclSpec().isVirtualSpecified()) 2476 Diag(D.getDeclSpec().getVirtualSpecLoc(), 2477 diag::err_virtual_non_function); 2478 2479 if (D.getDeclSpec().isExplicitSpecified()) 2480 Diag(D.getDeclSpec().getExplicitSpecLoc(), 2481 diag::err_explicit_non_function); 2482} 2483 2484NamedDecl* 2485Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 2486 QualType R, TypeSourceInfo *TInfo, 2487 LookupResult &Previous, bool &Redeclaration) { 2488 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 2489 if (D.getCXXScopeSpec().isSet()) { 2490 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 2491 << D.getCXXScopeSpec().getRange(); 2492 D.setInvalidType(); 2493 // Pretend we didn't see the scope specifier. 2494 DC = CurContext; 2495 Previous.clear(); 2496 } 2497 2498 if (getLangOptions().CPlusPlus) { 2499 // Check that there are no default arguments (C++ only). 2500 CheckExtraCXXDefaultArguments(D); 2501 } 2502 2503 DiagnoseFunctionSpecifiers(D); 2504 2505 if (D.getDeclSpec().isThreadSpecified()) 2506 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 2507 2508 if (D.getName().Kind != UnqualifiedId::IK_Identifier) { 2509 Diag(D.getName().StartLocation, diag::err_typedef_not_identifier) 2510 << D.getName().getSourceRange(); 2511 return 0; 2512 } 2513 2514 TypedefDecl *NewTD = ParseTypedefDecl(S, D, R, TInfo); 2515 if (!NewTD) return 0; 2516 2517 // Handle attributes prior to checking for duplicates in MergeVarDecl 2518 ProcessDeclAttributes(S, NewTD, D); 2519 2520 // C99 6.7.7p2: If a typedef name specifies a variably modified type 2521 // then it shall have block scope. 2522 // Note that variably modified types must be fixed before merging the decl so 2523 // that redeclarations will match. 2524 QualType T = NewTD->getUnderlyingType(); 2525 if (T->isVariablyModifiedType()) { 2526 setFunctionHasBranchProtectedScope(); 2527 2528 if (S->getFnParent() == 0) { 2529 bool SizeIsNegative; 2530 llvm::APSInt Oversized; 2531 QualType FixedTy = 2532 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 2533 Oversized); 2534 if (!FixedTy.isNull()) { 2535 Diag(D.getIdentifierLoc(), diag::warn_illegal_constant_array_size); 2536 NewTD->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(FixedTy)); 2537 } else { 2538 if (SizeIsNegative) 2539 Diag(D.getIdentifierLoc(), diag::err_typecheck_negative_array_size); 2540 else if (T->isVariableArrayType()) 2541 Diag(D.getIdentifierLoc(), diag::err_vla_decl_in_file_scope); 2542 else if (Oversized.getBoolValue()) 2543 Diag(D.getIdentifierLoc(), diag::err_array_too_large) 2544 << Oversized.toString(10); 2545 else 2546 Diag(D.getIdentifierLoc(), diag::err_vm_decl_in_file_scope); 2547 NewTD->setInvalidDecl(); 2548 } 2549 } 2550 } 2551 2552 // Merge the decl with the existing one if appropriate. If the decl is 2553 // in an outer scope, it isn't the same thing. 2554 FilterLookupForScope(*this, Previous, DC, S, /*ConsiderLinkage*/ false); 2555 if (!Previous.empty()) { 2556 Redeclaration = true; 2557 MergeTypeDefDecl(NewTD, Previous); 2558 } 2559 2560 // If this is the C FILE type, notify the AST context. 2561 if (IdentifierInfo *II = NewTD->getIdentifier()) 2562 if (!NewTD->isInvalidDecl() && 2563 NewTD->getDeclContext()->getLookupContext()->isTranslationUnit()) { 2564 if (II->isStr("FILE")) 2565 Context.setFILEDecl(NewTD); 2566 else if (II->isStr("jmp_buf")) 2567 Context.setjmp_bufDecl(NewTD); 2568 else if (II->isStr("sigjmp_buf")) 2569 Context.setsigjmp_bufDecl(NewTD); 2570 } 2571 2572 return NewTD; 2573} 2574 2575/// \brief Determines whether the given declaration is an out-of-scope 2576/// previous declaration. 2577/// 2578/// This routine should be invoked when name lookup has found a 2579/// previous declaration (PrevDecl) that is not in the scope where a 2580/// new declaration by the same name is being introduced. If the new 2581/// declaration occurs in a local scope, previous declarations with 2582/// linkage may still be considered previous declarations (C99 2583/// 6.2.2p4-5, C++ [basic.link]p6). 2584/// 2585/// \param PrevDecl the previous declaration found by name 2586/// lookup 2587/// 2588/// \param DC the context in which the new declaration is being 2589/// declared. 2590/// 2591/// \returns true if PrevDecl is an out-of-scope previous declaration 2592/// for a new delcaration with the same name. 2593static bool 2594isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 2595 ASTContext &Context) { 2596 if (!PrevDecl) 2597 return 0; 2598 2599 if (!PrevDecl->hasLinkage()) 2600 return false; 2601 2602 if (Context.getLangOptions().CPlusPlus) { 2603 // C++ [basic.link]p6: 2604 // If there is a visible declaration of an entity with linkage 2605 // having the same name and type, ignoring entities declared 2606 // outside the innermost enclosing namespace scope, the block 2607 // scope declaration declares that same entity and receives the 2608 // linkage of the previous declaration. 2609 DeclContext *OuterContext = DC->getLookupContext(); 2610 if (!OuterContext->isFunctionOrMethod()) 2611 // This rule only applies to block-scope declarations. 2612 return false; 2613 else { 2614 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 2615 if (PrevOuterContext->isRecord()) 2616 // We found a member function: ignore it. 2617 return false; 2618 else { 2619 // Find the innermost enclosing namespace for the new and 2620 // previous declarations. 2621 while (!OuterContext->isFileContext()) 2622 OuterContext = OuterContext->getParent(); 2623 while (!PrevOuterContext->isFileContext()) 2624 PrevOuterContext = PrevOuterContext->getParent(); 2625 2626 // The previous declaration is in a different namespace, so it 2627 // isn't the same function. 2628 if (OuterContext->getPrimaryContext() != 2629 PrevOuterContext->getPrimaryContext()) 2630 return false; 2631 } 2632 } 2633 } 2634 2635 return true; 2636} 2637 2638static void SetNestedNameSpecifier(DeclaratorDecl *DD, Declarator &D) { 2639 CXXScopeSpec &SS = D.getCXXScopeSpec(); 2640 if (!SS.isSet()) return; 2641 DD->setQualifierInfo(static_cast<NestedNameSpecifier*>(SS.getScopeRep()), 2642 SS.getRange()); 2643} 2644 2645NamedDecl* 2646Sema::ActOnVariableDeclarator(Scope* S, Declarator& D, DeclContext* DC, 2647 QualType R, TypeSourceInfo *TInfo, 2648 LookupResult &Previous, 2649 MultiTemplateParamsArg TemplateParamLists, 2650 bool &Redeclaration) { 2651 DeclarationName Name = GetNameForDeclarator(D).getName(); 2652 2653 // Check that there are no default arguments (C++ only). 2654 if (getLangOptions().CPlusPlus) 2655 CheckExtraCXXDefaultArguments(D); 2656 2657 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpec(); 2658 assert(SCSpec != DeclSpec::SCS_typedef && 2659 "Parser allowed 'typedef' as storage class VarDecl."); 2660 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 2661 if (SCSpec == DeclSpec::SCS_mutable) { 2662 // mutable can only appear on non-static class members, so it's always 2663 // an error here 2664 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 2665 D.setInvalidType(); 2666 SC = VarDecl::None; 2667 } 2668 SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 2669 VarDecl::StorageClass SCAsWritten 2670 = StorageClassSpecToVarDeclStorageClass(SCSpec); 2671 2672 IdentifierInfo *II = Name.getAsIdentifierInfo(); 2673 if (!II) { 2674 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 2675 << Name.getAsString(); 2676 return 0; 2677 } 2678 2679 DiagnoseFunctionSpecifiers(D); 2680 2681 if (!DC->isRecord() && S->getFnParent() == 0) { 2682 // C99 6.9p2: The storage-class specifiers auto and register shall not 2683 // appear in the declaration specifiers in an external declaration. 2684 if (SC == VarDecl::Auto || SC == VarDecl::Register) { 2685 2686 // If this is a register variable with an asm label specified, then this 2687 // is a GNU extension. 2688 if (SC == VarDecl::Register && D.getAsmLabel()) 2689 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register); 2690 else 2691 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 2692 D.setInvalidType(); 2693 } 2694 } 2695 if (DC->isRecord() && !CurContext->isRecord()) { 2696 // This is an out-of-line definition of a static data member. 2697 if (SC == VarDecl::Static) { 2698 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 2699 diag::err_static_out_of_line) 2700 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 2701 } else if (SC == VarDecl::None) 2702 SC = VarDecl::Static; 2703 } 2704 if (SC == VarDecl::Static) { 2705 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) { 2706 if (RD->isLocalClass()) 2707 Diag(D.getIdentifierLoc(), 2708 diag::err_static_data_member_not_allowed_in_local_class) 2709 << Name << RD->getDeclName(); 2710 } 2711 } 2712 2713 // Match up the template parameter lists with the scope specifier, then 2714 // determine whether we have a template or a template specialization. 2715 bool isExplicitSpecialization = false; 2716 unsigned NumMatchedTemplateParamLists = TemplateParamLists.size(); 2717 bool Invalid = false; 2718 if (TemplateParameterList *TemplateParams 2719 = MatchTemplateParametersToScopeSpecifier( 2720 D.getDeclSpec().getSourceRange().getBegin(), 2721 D.getCXXScopeSpec(), 2722 (TemplateParameterList**)TemplateParamLists.get(), 2723 TemplateParamLists.size(), 2724 /*never a friend*/ false, 2725 isExplicitSpecialization, 2726 Invalid)) { 2727 // All but one template parameter lists have been matching. 2728 --NumMatchedTemplateParamLists; 2729 2730 if (TemplateParams->size() > 0) { 2731 // There is no such thing as a variable template. 2732 Diag(D.getIdentifierLoc(), diag::err_template_variable) 2733 << II 2734 << SourceRange(TemplateParams->getTemplateLoc(), 2735 TemplateParams->getRAngleLoc()); 2736 return 0; 2737 } else { 2738 // There is an extraneous 'template<>' for this variable. Complain 2739 // about it, but allow the declaration of the variable. 2740 Diag(TemplateParams->getTemplateLoc(), 2741 diag::err_template_variable_noparams) 2742 << II 2743 << SourceRange(TemplateParams->getTemplateLoc(), 2744 TemplateParams->getRAngleLoc()); 2745 2746 isExplicitSpecialization = true; 2747 } 2748 } 2749 2750 VarDecl *NewVD = VarDecl::Create(Context, DC, D.getIdentifierLoc(), 2751 II, R, TInfo, SC, SCAsWritten); 2752 2753 if (D.isInvalidType() || Invalid) 2754 NewVD->setInvalidDecl(); 2755 2756 SetNestedNameSpecifier(NewVD, D); 2757 2758 if (NumMatchedTemplateParamLists > 0 && D.getCXXScopeSpec().isSet()) { 2759 NewVD->setTemplateParameterListsInfo(Context, 2760 NumMatchedTemplateParamLists, 2761 (TemplateParameterList**)TemplateParamLists.release()); 2762 } 2763 2764 if (D.getDeclSpec().isThreadSpecified()) { 2765 if (NewVD->hasLocalStorage()) 2766 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global); 2767 else if (!Context.Target.isTLSSupported()) 2768 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported); 2769 else 2770 NewVD->setThreadSpecified(true); 2771 } 2772 2773 // Set the lexical context. If the declarator has a C++ scope specifier, the 2774 // lexical context will be different from the semantic context. 2775 NewVD->setLexicalDeclContext(CurContext); 2776 2777 // Handle attributes prior to checking for duplicates in MergeVarDecl 2778 ProcessDeclAttributes(S, NewVD, D); 2779 2780 // Handle GNU asm-label extension (encoded as an attribute). 2781 if (Expr *E = (Expr*) D.getAsmLabel()) { 2782 // The parser guarantees this is a string. 2783 StringLiteral *SE = cast<StringLiteral>(E); 2784 NewVD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), 2785 Context, SE->getString())); 2786 } 2787 2788 // Diagnose shadowed variables before filtering for scope. 2789 if (!D.getCXXScopeSpec().isSet()) 2790 CheckShadow(S, NewVD, Previous); 2791 2792 // Don't consider existing declarations that are in a different 2793 // scope and are out-of-semantic-context declarations (if the new 2794 // declaration has linkage). 2795 FilterLookupForScope(*this, Previous, DC, S, NewVD->hasLinkage()); 2796 2797 // Merge the decl with the existing one if appropriate. 2798 if (!Previous.empty()) { 2799 if (Previous.isSingleResult() && 2800 isa<FieldDecl>(Previous.getFoundDecl()) && 2801 D.getCXXScopeSpec().isSet()) { 2802 // The user tried to define a non-static data member 2803 // out-of-line (C++ [dcl.meaning]p1). 2804 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 2805 << D.getCXXScopeSpec().getRange(); 2806 Previous.clear(); 2807 NewVD->setInvalidDecl(); 2808 } 2809 } else if (D.getCXXScopeSpec().isSet()) { 2810 // No previous declaration in the qualifying scope. 2811 Diag(D.getIdentifierLoc(), diag::err_no_member) 2812 << Name << computeDeclContext(D.getCXXScopeSpec(), true) 2813 << D.getCXXScopeSpec().getRange(); 2814 NewVD->setInvalidDecl(); 2815 } 2816 2817 CheckVariableDeclaration(NewVD, Previous, Redeclaration); 2818 2819 // This is an explicit specialization of a static data member. Check it. 2820 if (isExplicitSpecialization && !NewVD->isInvalidDecl() && 2821 CheckMemberSpecialization(NewVD, Previous)) 2822 NewVD->setInvalidDecl(); 2823 2824 // attributes declared post-definition are currently ignored 2825 // FIXME: This should be handled in attribute merging, not 2826 // here. 2827 if (Previous.isSingleResult()) { 2828 VarDecl *Def = dyn_cast<VarDecl>(Previous.getFoundDecl()); 2829 if (Def && (Def = Def->getDefinition()) && 2830 Def != NewVD && D.hasAttributes()) { 2831 Diag(NewVD->getLocation(), diag::warn_attribute_precede_definition); 2832 Diag(Def->getLocation(), diag::note_previous_definition); 2833 } 2834 } 2835 2836 // If this is a locally-scoped extern C variable, update the map of 2837 // such variables. 2838 if (CurContext->isFunctionOrMethod() && NewVD->isExternC() && 2839 !NewVD->isInvalidDecl()) 2840 RegisterLocallyScopedExternCDecl(NewVD, Previous, S); 2841 2842 // If there's a #pragma GCC visibility in scope, and this isn't a class 2843 // member, set the visibility of this variable. 2844 if (NewVD->getLinkage() == ExternalLinkage && !DC->isRecord()) 2845 AddPushedVisibilityAttribute(NewVD); 2846 2847 MarkUnusedFileScopedDecl(NewVD); 2848 2849 return NewVD; 2850} 2851 2852/// \brief Diagnose variable or built-in function shadowing. Implements 2853/// -Wshadow. 2854/// 2855/// This method is called whenever a VarDecl is added to a "useful" 2856/// scope. 2857/// 2858/// \param S the scope in which the shadowing name is being declared 2859/// \param R the lookup of the name 2860/// 2861void Sema::CheckShadow(Scope *S, VarDecl *D, const LookupResult& R) { 2862 // Return if warning is ignored. 2863 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow) == Diagnostic::Ignored) 2864 return; 2865 2866 // Don't diagnose declarations at file scope. The scope might not 2867 // have a DeclContext if (e.g.) we're parsing a function prototype. 2868 DeclContext *NewDC = static_cast<DeclContext*>(S->getEntity()); 2869 if (NewDC && NewDC->isFileContext()) 2870 return; 2871 2872 // Only diagnose if we're shadowing an unambiguous field or variable. 2873 if (R.getResultKind() != LookupResult::Found) 2874 return; 2875 2876 NamedDecl* ShadowedDecl = R.getFoundDecl(); 2877 if (!isa<VarDecl>(ShadowedDecl) && !isa<FieldDecl>(ShadowedDecl)) 2878 return; 2879 2880 DeclContext *OldDC = ShadowedDecl->getDeclContext(); 2881 2882 // Only warn about certain kinds of shadowing for class members. 2883 if (NewDC && NewDC->isRecord()) { 2884 // In particular, don't warn about shadowing non-class members. 2885 if (!OldDC->isRecord()) 2886 return; 2887 2888 // TODO: should we warn about static data members shadowing 2889 // static data members from base classes? 2890 2891 // TODO: don't diagnose for inaccessible shadowed members. 2892 // This is hard to do perfectly because we might friend the 2893 // shadowing context, but that's just a false negative. 2894 } 2895 2896 // Determine what kind of declaration we're shadowing. 2897 unsigned Kind; 2898 if (isa<RecordDecl>(OldDC)) { 2899 if (isa<FieldDecl>(ShadowedDecl)) 2900 Kind = 3; // field 2901 else 2902 Kind = 2; // static data member 2903 } else if (OldDC->isFileContext()) 2904 Kind = 1; // global 2905 else 2906 Kind = 0; // local 2907 2908 DeclarationName Name = R.getLookupName(); 2909 2910 // Emit warning and note. 2911 Diag(R.getNameLoc(), diag::warn_decl_shadow) << Name << Kind << OldDC; 2912 Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration); 2913} 2914 2915/// \brief Check -Wshadow without the advantage of a previous lookup. 2916void Sema::CheckShadow(Scope *S, VarDecl *D) { 2917 LookupResult R(*this, D->getDeclName(), D->getLocation(), 2918 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 2919 LookupName(R, S); 2920 CheckShadow(S, D, R); 2921} 2922 2923/// \brief Perform semantic checking on a newly-created variable 2924/// declaration. 2925/// 2926/// This routine performs all of the type-checking required for a 2927/// variable declaration once it has been built. It is used both to 2928/// check variables after they have been parsed and their declarators 2929/// have been translated into a declaration, and to check variables 2930/// that have been instantiated from a template. 2931/// 2932/// Sets NewVD->isInvalidDecl() if an error was encountered. 2933void Sema::CheckVariableDeclaration(VarDecl *NewVD, 2934 LookupResult &Previous, 2935 bool &Redeclaration) { 2936 // If the decl is already known invalid, don't check it. 2937 if (NewVD->isInvalidDecl()) 2938 return; 2939 2940 QualType T = NewVD->getType(); 2941 2942 if (T->isObjCObjectType()) { 2943 Diag(NewVD->getLocation(), diag::err_statically_allocated_object); 2944 return NewVD->setInvalidDecl(); 2945 } 2946 2947 // Emit an error if an address space was applied to decl with local storage. 2948 // This includes arrays of objects with address space qualifiers, but not 2949 // automatic variables that point to other address spaces. 2950 // ISO/IEC TR 18037 S5.1.2 2951 if (NewVD->hasLocalStorage() && (T.getAddressSpace() != 0)) { 2952 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 2953 return NewVD->setInvalidDecl(); 2954 } 2955 2956 if (NewVD->hasLocalStorage() && T.isObjCGCWeak() 2957 && !NewVD->hasAttr<BlocksAttr>()) 2958 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 2959 2960 bool isVM = T->isVariablyModifiedType(); 2961 if (isVM || NewVD->hasAttr<CleanupAttr>() || 2962 NewVD->hasAttr<BlocksAttr>()) 2963 setFunctionHasBranchProtectedScope(); 2964 2965 if ((isVM && NewVD->hasLinkage()) || 2966 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { 2967 bool SizeIsNegative; 2968 llvm::APSInt Oversized; 2969 QualType FixedTy = 2970 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 2971 Oversized); 2972 2973 if (FixedTy.isNull() && T->isVariableArrayType()) { 2974 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 2975 // FIXME: This won't give the correct result for 2976 // int a[10][n]; 2977 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 2978 2979 if (NewVD->isFileVarDecl()) 2980 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 2981 << SizeRange; 2982 else if (NewVD->getStorageClass() == VarDecl::Static) 2983 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 2984 << SizeRange; 2985 else 2986 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 2987 << SizeRange; 2988 return NewVD->setInvalidDecl(); 2989 } 2990 2991 if (FixedTy.isNull()) { 2992 if (NewVD->isFileVarDecl()) 2993 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 2994 else 2995 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 2996 return NewVD->setInvalidDecl(); 2997 } 2998 2999 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 3000 NewVD->setType(FixedTy); 3001 } 3002 3003 if (Previous.empty() && NewVD->isExternC()) { 3004 // Since we did not find anything by this name and we're declaring 3005 // an extern "C" variable, look for a non-visible extern "C" 3006 // declaration with the same name. 3007 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3008 = LocallyScopedExternalDecls.find(NewVD->getDeclName()); 3009 if (Pos != LocallyScopedExternalDecls.end()) 3010 Previous.addDecl(Pos->second); 3011 } 3012 3013 if (T->isVoidType() && !NewVD->hasExternalStorage()) { 3014 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 3015 << T; 3016 return NewVD->setInvalidDecl(); 3017 } 3018 3019 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { 3020 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); 3021 return NewVD->setInvalidDecl(); 3022 } 3023 3024 if (isVM && NewVD->hasAttr<BlocksAttr>()) { 3025 Diag(NewVD->getLocation(), diag::err_block_on_vm); 3026 return NewVD->setInvalidDecl(); 3027 } 3028 3029 // Function pointers and references cannot have qualified function type, only 3030 // function pointer-to-members can do that. 3031 QualType Pointee; 3032 unsigned PtrOrRef = 0; 3033 if (const PointerType *Ptr = T->getAs<PointerType>()) 3034 Pointee = Ptr->getPointeeType(); 3035 else if (const ReferenceType *Ref = T->getAs<ReferenceType>()) { 3036 Pointee = Ref->getPointeeType(); 3037 PtrOrRef = 1; 3038 } 3039 if (!Pointee.isNull() && Pointee->isFunctionProtoType() && 3040 Pointee->getAs<FunctionProtoType>()->getTypeQuals() != 0) { 3041 Diag(NewVD->getLocation(), diag::err_invalid_qualified_function_pointer) 3042 << PtrOrRef; 3043 return NewVD->setInvalidDecl(); 3044 } 3045 3046 if (!Previous.empty()) { 3047 Redeclaration = true; 3048 MergeVarDecl(NewVD, Previous); 3049 } 3050} 3051 3052/// \brief Data used with FindOverriddenMethod 3053struct FindOverriddenMethodData { 3054 Sema *S; 3055 CXXMethodDecl *Method; 3056}; 3057 3058/// \brief Member lookup function that determines whether a given C++ 3059/// method overrides a method in a base class, to be used with 3060/// CXXRecordDecl::lookupInBases(). 3061static bool FindOverriddenMethod(const CXXBaseSpecifier *Specifier, 3062 CXXBasePath &Path, 3063 void *UserData) { 3064 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 3065 3066 FindOverriddenMethodData *Data 3067 = reinterpret_cast<FindOverriddenMethodData*>(UserData); 3068 3069 DeclarationName Name = Data->Method->getDeclName(); 3070 3071 // FIXME: Do we care about other names here too? 3072 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 3073 // We really want to find the base class destructor here. 3074 QualType T = Data->S->Context.getTypeDeclType(BaseRecord); 3075 CanQualType CT = Data->S->Context.getCanonicalType(T); 3076 3077 Name = Data->S->Context.DeclarationNames.getCXXDestructorName(CT); 3078 } 3079 3080 for (Path.Decls = BaseRecord->lookup(Name); 3081 Path.Decls.first != Path.Decls.second; 3082 ++Path.Decls.first) { 3083 NamedDecl *D = *Path.Decls.first; 3084 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 3085 if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD, false)) 3086 return true; 3087 } 3088 } 3089 3090 return false; 3091} 3092 3093/// AddOverriddenMethods - See if a method overrides any in the base classes, 3094/// and if so, check that it's a valid override and remember it. 3095void Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 3096 // Look for virtual methods in base classes that this method might override. 3097 CXXBasePaths Paths; 3098 FindOverriddenMethodData Data; 3099 Data.Method = MD; 3100 Data.S = this; 3101 if (DC->lookupInBases(&FindOverriddenMethod, &Data, Paths)) { 3102 for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(), 3103 E = Paths.found_decls_end(); I != E; ++I) { 3104 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) { 3105 if (!CheckOverridingFunctionReturnType(MD, OldMD) && 3106 !CheckOverridingFunctionExceptionSpec(MD, OldMD) && 3107 !CheckOverridingFunctionAttributes(MD, OldMD)) 3108 MD->addOverriddenMethod(OldMD->getCanonicalDecl()); 3109 } 3110 } 3111 } 3112} 3113 3114NamedDecl* 3115Sema::ActOnFunctionDeclarator(Scope* S, Declarator& D, DeclContext* DC, 3116 QualType R, TypeSourceInfo *TInfo, 3117 LookupResult &Previous, 3118 MultiTemplateParamsArg TemplateParamLists, 3119 bool IsFunctionDefinition, bool &Redeclaration) { 3120 assert(R.getTypePtr()->isFunctionType()); 3121 3122 // TODO: consider using NameInfo for diagnostic. 3123 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 3124 DeclarationName Name = NameInfo.getName(); 3125 FunctionDecl::StorageClass SC = FunctionDecl::None; 3126 switch (D.getDeclSpec().getStorageClassSpec()) { 3127 default: assert(0 && "Unknown storage class!"); 3128 case DeclSpec::SCS_auto: 3129 case DeclSpec::SCS_register: 3130 case DeclSpec::SCS_mutable: 3131 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 3132 diag::err_typecheck_sclass_func); 3133 D.setInvalidType(); 3134 break; 3135 case DeclSpec::SCS_unspecified: SC = FunctionDecl::None; break; 3136 case DeclSpec::SCS_extern: SC = FunctionDecl::Extern; break; 3137 case DeclSpec::SCS_static: { 3138 if (CurContext->getLookupContext()->isFunctionOrMethod()) { 3139 // C99 6.7.1p5: 3140 // The declaration of an identifier for a function that has 3141 // block scope shall have no explicit storage-class specifier 3142 // other than extern 3143 // See also (C++ [dcl.stc]p4). 3144 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 3145 diag::err_static_block_func); 3146 SC = FunctionDecl::None; 3147 } else 3148 SC = FunctionDecl::Static; 3149 break; 3150 } 3151 case DeclSpec::SCS_private_extern: SC = FunctionDecl::PrivateExtern;break; 3152 } 3153 3154 if (D.getDeclSpec().isThreadSpecified()) 3155 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 3156 3157 bool isFriend = D.getDeclSpec().isFriendSpecified(); 3158 bool isInline = D.getDeclSpec().isInlineSpecified(); 3159 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 3160 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 3161 3162 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 3163 FunctionDecl::StorageClass SCAsWritten 3164 = StorageClassSpecToFunctionDeclStorageClass(SCSpec); 3165 3166 // Check that the return type is not an abstract class type. 3167 // For record types, this is done by the AbstractClassUsageDiagnoser once 3168 // the class has been completely parsed. 3169 if (!DC->isRecord() && 3170 RequireNonAbstractType(D.getIdentifierLoc(), 3171 R->getAs<FunctionType>()->getResultType(), 3172 diag::err_abstract_type_in_decl, 3173 AbstractReturnType)) 3174 D.setInvalidType(); 3175 3176 // Do not allow returning a objc interface by-value. 3177 if (R->getAs<FunctionType>()->getResultType()->isObjCObjectType()) { 3178 Diag(D.getIdentifierLoc(), 3179 diag::err_object_cannot_be_passed_returned_by_value) << 0 3180 << R->getAs<FunctionType>()->getResultType(); 3181 D.setInvalidType(); 3182 } 3183 3184 bool isVirtualOkay = false; 3185 FunctionDecl *NewFD; 3186 3187 if (isFriend) { 3188 // C++ [class.friend]p5 3189 // A function can be defined in a friend declaration of a 3190 // class . . . . Such a function is implicitly inline. 3191 isInline |= IsFunctionDefinition; 3192 } 3193 3194 if (Name.getNameKind() == DeclarationName::CXXConstructorName) { 3195 // This is a C++ constructor declaration. 3196 assert(DC->isRecord() && 3197 "Constructors can only be declared in a member context"); 3198 3199 R = CheckConstructorDeclarator(D, R, SC); 3200 3201 // Create the new declaration 3202 NewFD = CXXConstructorDecl::Create(Context, 3203 cast<CXXRecordDecl>(DC), 3204 NameInfo, R, TInfo, 3205 isExplicit, isInline, 3206 /*isImplicitlyDeclared=*/false); 3207 } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 3208 // This is a C++ destructor declaration. 3209 if (DC->isRecord()) { 3210 R = CheckDestructorDeclarator(D, R, SC); 3211 3212 NewFD = CXXDestructorDecl::Create(Context, 3213 cast<CXXRecordDecl>(DC), 3214 NameInfo, R, 3215 isInline, 3216 /*isImplicitlyDeclared=*/false); 3217 NewFD->setTypeSourceInfo(TInfo); 3218 3219 isVirtualOkay = true; 3220 } else { 3221 Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 3222 3223 // Create a FunctionDecl to satisfy the function definition parsing 3224 // code path. 3225 NewFD = FunctionDecl::Create(Context, DC, D.getIdentifierLoc(), 3226 Name, R, TInfo, SC, SCAsWritten, isInline, 3227 /*hasPrototype=*/true); 3228 D.setInvalidType(); 3229 } 3230 } else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) { 3231 if (!DC->isRecord()) { 3232 Diag(D.getIdentifierLoc(), 3233 diag::err_conv_function_not_member); 3234 return 0; 3235 } 3236 3237 CheckConversionDeclarator(D, R, SC); 3238 NewFD = CXXConversionDecl::Create(Context, cast<CXXRecordDecl>(DC), 3239 NameInfo, R, TInfo, 3240 isInline, isExplicit); 3241 3242 isVirtualOkay = true; 3243 } else if (DC->isRecord()) { 3244 // If the of the function is the same as the name of the record, then this 3245 // must be an invalid constructor that has a return type. 3246 // (The parser checks for a return type and makes the declarator a 3247 // constructor if it has no return type). 3248 // must have an invalid constructor that has a return type 3249 if (Name.getAsIdentifierInfo() && 3250 Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ 3251 Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 3252 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 3253 << SourceRange(D.getIdentifierLoc()); 3254 return 0; 3255 } 3256 3257 bool isStatic = SC == FunctionDecl::Static; 3258 3259 // [class.free]p1: 3260 // Any allocation function for a class T is a static member 3261 // (even if not explicitly declared static). 3262 if (Name.getCXXOverloadedOperator() == OO_New || 3263 Name.getCXXOverloadedOperator() == OO_Array_New) 3264 isStatic = true; 3265 3266 // [class.free]p6 Any deallocation function for a class X is a static member 3267 // (even if not explicitly declared static). 3268 if (Name.getCXXOverloadedOperator() == OO_Delete || 3269 Name.getCXXOverloadedOperator() == OO_Array_Delete) 3270 isStatic = true; 3271 3272 // This is a C++ method declaration. 3273 NewFD = CXXMethodDecl::Create(Context, cast<CXXRecordDecl>(DC), 3274 NameInfo, R, TInfo, 3275 isStatic, SCAsWritten, isInline); 3276 3277 isVirtualOkay = !isStatic; 3278 } else { 3279 // Determine whether the function was written with a 3280 // prototype. This true when: 3281 // - we're in C++ (where every function has a prototype), 3282 // - there is a prototype in the declarator, or 3283 // - the type R of the function is some kind of typedef or other reference 3284 // to a type name (which eventually refers to a function type). 3285 bool HasPrototype = 3286 getLangOptions().CPlusPlus || 3287 (D.getNumTypeObjects() && D.getTypeObject(0).Fun.hasPrototype) || 3288 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 3289 3290 NewFD = FunctionDecl::Create(Context, DC, 3291 NameInfo, R, TInfo, SC, SCAsWritten, isInline, 3292 HasPrototype); 3293 } 3294 3295 if (D.isInvalidType()) 3296 NewFD->setInvalidDecl(); 3297 3298 SetNestedNameSpecifier(NewFD, D); 3299 3300 // Set the lexical context. If the declarator has a C++ 3301 // scope specifier, or is the object of a friend declaration, the 3302 // lexical context will be different from the semantic context. 3303 NewFD->setLexicalDeclContext(CurContext); 3304 3305 // Match up the template parameter lists with the scope specifier, then 3306 // determine whether we have a template or a template specialization. 3307 FunctionTemplateDecl *FunctionTemplate = 0; 3308 bool isExplicitSpecialization = false; 3309 bool isFunctionTemplateSpecialization = false; 3310 unsigned NumMatchedTemplateParamLists = TemplateParamLists.size(); 3311 bool Invalid = false; 3312 if (TemplateParameterList *TemplateParams 3313 = MatchTemplateParametersToScopeSpecifier( 3314 D.getDeclSpec().getSourceRange().getBegin(), 3315 D.getCXXScopeSpec(), 3316 (TemplateParameterList**)TemplateParamLists.get(), 3317 TemplateParamLists.size(), 3318 isFriend, 3319 isExplicitSpecialization, 3320 Invalid)) { 3321 // All but one template parameter lists have been matching. 3322 --NumMatchedTemplateParamLists; 3323 3324 if (TemplateParams->size() > 0) { 3325 // This is a function template 3326 3327 // Check that we can declare a template here. 3328 if (CheckTemplateDeclScope(S, TemplateParams)) 3329 return 0; 3330 3331 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC, 3332 NewFD->getLocation(), 3333 Name, TemplateParams, 3334 NewFD); 3335 FunctionTemplate->setLexicalDeclContext(CurContext); 3336 NewFD->setDescribedFunctionTemplate(FunctionTemplate); 3337 } else { 3338 // This is a function template specialization. 3339 isFunctionTemplateSpecialization = true; 3340 3341 // C++0x [temp.expl.spec]p20 forbids "template<> friend void foo(int);". 3342 if (isFriend && isFunctionTemplateSpecialization) { 3343 // We want to remove the "template<>", found here. 3344 SourceRange RemoveRange = TemplateParams->getSourceRange(); 3345 3346 // If we remove the template<> and the name is not a 3347 // template-id, we're actually silently creating a problem: 3348 // the friend declaration will refer to an untemplated decl, 3349 // and clearly the user wants a template specialization. So 3350 // we need to insert '<>' after the name. 3351 SourceLocation InsertLoc; 3352 if (D.getName().getKind() != UnqualifiedId::IK_TemplateId) { 3353 InsertLoc = D.getName().getSourceRange().getEnd(); 3354 InsertLoc = PP.getLocForEndOfToken(InsertLoc); 3355 } 3356 3357 Diag(D.getIdentifierLoc(), diag::err_template_spec_decl_friend) 3358 << Name << RemoveRange 3359 << FixItHint::CreateRemoval(RemoveRange) 3360 << FixItHint::CreateInsertion(InsertLoc, "<>"); 3361 } 3362 } 3363 } 3364 3365 if (NumMatchedTemplateParamLists > 0 && D.getCXXScopeSpec().isSet()) { 3366 NewFD->setTemplateParameterListsInfo(Context, 3367 NumMatchedTemplateParamLists, 3368 (TemplateParameterList**)TemplateParamLists.release()); 3369 } 3370 3371 if (Invalid) { 3372 NewFD->setInvalidDecl(); 3373 if (FunctionTemplate) 3374 FunctionTemplate->setInvalidDecl(); 3375 } 3376 3377 // C++ [dcl.fct.spec]p5: 3378 // The virtual specifier shall only be used in declarations of 3379 // nonstatic class member functions that appear within a 3380 // member-specification of a class declaration; see 10.3. 3381 // 3382 if (isVirtual && !NewFD->isInvalidDecl()) { 3383 if (!isVirtualOkay) { 3384 Diag(D.getDeclSpec().getVirtualSpecLoc(), 3385 diag::err_virtual_non_function); 3386 } else if (!CurContext->isRecord()) { 3387 // 'virtual' was specified outside of the class. 3388 Diag(D.getDeclSpec().getVirtualSpecLoc(), diag::err_virtual_out_of_class) 3389 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 3390 } else { 3391 // Okay: Add virtual to the method. 3392 CXXRecordDecl *CurClass = cast<CXXRecordDecl>(DC); 3393 CurClass->setMethodAsVirtual(NewFD); 3394 } 3395 } 3396 3397 // C++ [dcl.fct.spec]p3: 3398 // The inline specifier shall not appear on a block scope function declaration. 3399 if (isInline && !NewFD->isInvalidDecl() && getLangOptions().CPlusPlus) { 3400 if (CurContext->isFunctionOrMethod()) { 3401 // 'inline' is not allowed on block scope function declaration. 3402 Diag(D.getDeclSpec().getInlineSpecLoc(), 3403 diag::err_inline_declaration_block_scope) << Name 3404 << FixItHint::CreateRemoval(D.getDeclSpec().getInlineSpecLoc()); 3405 } 3406 } 3407 3408 // C++ [dcl.fct.spec]p6: 3409 // The explicit specifier shall be used only in the declaration of a 3410 // constructor or conversion function within its class definition; see 12.3.1 3411 // and 12.3.2. 3412 if (isExplicit && !NewFD->isInvalidDecl()) { 3413 if (!CurContext->isRecord()) { 3414 // 'explicit' was specified outside of the class. 3415 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3416 diag::err_explicit_out_of_class) 3417 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 3418 } else if (!isa<CXXConstructorDecl>(NewFD) && 3419 !isa<CXXConversionDecl>(NewFD)) { 3420 // 'explicit' was specified on a function that wasn't a constructor 3421 // or conversion function. 3422 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3423 diag::err_explicit_non_ctor_or_conv_function) 3424 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 3425 } 3426 } 3427 3428 // Filter out previous declarations that don't match the scope. 3429 FilterLookupForScope(*this, Previous, DC, S, NewFD->hasLinkage()); 3430 3431 if (isFriend) { 3432 // DC is the namespace in which the function is being declared. 3433 assert((DC->isFileContext() || !Previous.empty()) && 3434 "previously-undeclared friend function being created " 3435 "in a non-namespace context"); 3436 3437 // For now, claim that the objects have no previous declaration. 3438 if (FunctionTemplate) { 3439 FunctionTemplate->setObjectOfFriendDecl(false); 3440 FunctionTemplate->setAccess(AS_public); 3441 } 3442 NewFD->setObjectOfFriendDecl(false); 3443 NewFD->setAccess(AS_public); 3444 } 3445 3446 if (SC == FunctionDecl::Static && isa<CXXMethodDecl>(NewFD) && 3447 !CurContext->isRecord()) { 3448 // C++ [class.static]p1: 3449 // A data or function member of a class may be declared static 3450 // in a class definition, in which case it is a static member of 3451 // the class. 3452 3453 // Complain about the 'static' specifier if it's on an out-of-line 3454 // member function definition. 3455 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 3456 diag::err_static_out_of_line) 3457 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3458 } 3459 3460 // Handle GNU asm-label extension (encoded as an attribute). 3461 if (Expr *E = (Expr*) D.getAsmLabel()) { 3462 // The parser guarantees this is a string. 3463 StringLiteral *SE = cast<StringLiteral>(E); 3464 NewFD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), Context, 3465 SE->getString())); 3466 } 3467 3468 // Copy the parameter declarations from the declarator D to the function 3469 // declaration NewFD, if they are available. First scavenge them into Params. 3470 llvm::SmallVector<ParmVarDecl*, 16> Params; 3471 if (D.getNumTypeObjects() > 0) { 3472 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 3473 3474 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 3475 // function that takes no arguments, not a function that takes a 3476 // single void argument. 3477 // We let through "const void" here because Sema::GetTypeForDeclarator 3478 // already checks for that case. 3479 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 3480 FTI.ArgInfo[0].Param && 3481 FTI.ArgInfo[0].Param.getAs<ParmVarDecl>()->getType()->isVoidType()) { 3482 // Empty arg list, don't push any params. 3483 ParmVarDecl *Param = FTI.ArgInfo[0].Param.getAs<ParmVarDecl>(); 3484 3485 // In C++, the empty parameter-type-list must be spelled "void"; a 3486 // typedef of void is not permitted. 3487 if (getLangOptions().CPlusPlus && 3488 Param->getType().getUnqualifiedType() != Context.VoidTy) 3489 Diag(Param->getLocation(), diag::err_param_typedef_of_void); 3490 // FIXME: Leaks decl? 3491 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 3492 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 3493 ParmVarDecl *Param = FTI.ArgInfo[i].Param.getAs<ParmVarDecl>(); 3494 assert(Param->getDeclContext() != NewFD && "Was set before ?"); 3495 Param->setDeclContext(NewFD); 3496 Params.push_back(Param); 3497 3498 if (Param->isInvalidDecl()) 3499 NewFD->setInvalidDecl(); 3500 } 3501 } 3502 3503 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) { 3504 // When we're declaring a function with a typedef, typeof, etc as in the 3505 // following example, we'll need to synthesize (unnamed) 3506 // parameters for use in the declaration. 3507 // 3508 // @code 3509 // typedef void fn(int); 3510 // fn f; 3511 // @endcode 3512 3513 // Synthesize a parameter for each argument type. 3514 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 3515 AE = FT->arg_type_end(); AI != AE; ++AI) { 3516 ParmVarDecl *Param = 3517 BuildParmVarDeclForTypedef(NewFD, D.getIdentifierLoc(), *AI); 3518 Params.push_back(Param); 3519 } 3520 } else { 3521 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && 3522 "Should not need args for typedef of non-prototype fn"); 3523 } 3524 // Finally, we know we have the right number of parameters, install them. 3525 NewFD->setParams(Params.data(), Params.size()); 3526 3527 // If the declarator is a template-id, translate the parser's template 3528 // argument list into our AST format. 3529 bool HasExplicitTemplateArgs = false; 3530 TemplateArgumentListInfo TemplateArgs; 3531 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) { 3532 TemplateIdAnnotation *TemplateId = D.getName().TemplateId; 3533 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc); 3534 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc); 3535 ASTTemplateArgsPtr TemplateArgsPtr(*this, 3536 TemplateId->getTemplateArgs(), 3537 TemplateId->NumArgs); 3538 translateTemplateArguments(TemplateArgsPtr, 3539 TemplateArgs); 3540 TemplateArgsPtr.release(); 3541 3542 HasExplicitTemplateArgs = true; 3543 3544 if (FunctionTemplate) { 3545 // FIXME: Diagnose function template with explicit template 3546 // arguments. 3547 HasExplicitTemplateArgs = false; 3548 } else if (!isFunctionTemplateSpecialization && 3549 !D.getDeclSpec().isFriendSpecified()) { 3550 // We have encountered something that the user meant to be a 3551 // specialization (because it has explicitly-specified template 3552 // arguments) but that was not introduced with a "template<>" (or had 3553 // too few of them). 3554 Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header) 3555 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc) 3556 << FixItHint::CreateInsertion( 3557 D.getDeclSpec().getSourceRange().getBegin(), 3558 "template<> "); 3559 isFunctionTemplateSpecialization = true; 3560 } else { 3561 // "friend void foo<>(int);" is an implicit specialization decl. 3562 isFunctionTemplateSpecialization = true; 3563 } 3564 } else if (isFriend && isFunctionTemplateSpecialization) { 3565 // This combination is only possible in a recovery case; the user 3566 // wrote something like: 3567 // template <> friend void foo(int); 3568 // which we're recovering from as if the user had written: 3569 // friend void foo<>(int); 3570 // Go ahead and fake up a template id. 3571 HasExplicitTemplateArgs = true; 3572 TemplateArgs.setLAngleLoc(D.getIdentifierLoc()); 3573 TemplateArgs.setRAngleLoc(D.getIdentifierLoc()); 3574 } 3575 3576 // If it's a friend (and only if it's a friend), it's possible 3577 // that either the specialized function type or the specialized 3578 // template is dependent, and therefore matching will fail. In 3579 // this case, don't check the specialization yet. 3580 if (isFunctionTemplateSpecialization && isFriend && 3581 (NewFD->getType()->isDependentType() || DC->isDependentContext())) { 3582 assert(HasExplicitTemplateArgs && 3583 "friend function specialization without template args"); 3584 if (CheckDependentFunctionTemplateSpecialization(NewFD, TemplateArgs, 3585 Previous)) 3586 NewFD->setInvalidDecl(); 3587 } else if (isFunctionTemplateSpecialization) { 3588 if (CheckFunctionTemplateSpecialization(NewFD, 3589 (HasExplicitTemplateArgs ? &TemplateArgs : 0), 3590 Previous)) 3591 NewFD->setInvalidDecl(); 3592 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD)) { 3593 if (CheckMemberSpecialization(NewFD, Previous)) 3594 NewFD->setInvalidDecl(); 3595 } 3596 3597 // Perform semantic checking on the function declaration. 3598 bool OverloadableAttrRequired = false; // FIXME: HACK! 3599 CheckFunctionDeclaration(S, NewFD, Previous, isExplicitSpecialization, 3600 Redeclaration, /*FIXME:*/OverloadableAttrRequired); 3601 3602 assert((NewFD->isInvalidDecl() || !Redeclaration || 3603 Previous.getResultKind() != LookupResult::FoundOverloaded) && 3604 "previous declaration set still overloaded"); 3605 3606 NamedDecl *PrincipalDecl = (FunctionTemplate 3607 ? cast<NamedDecl>(FunctionTemplate) 3608 : NewFD); 3609 3610 if (isFriend && Redeclaration) { 3611 AccessSpecifier Access = AS_public; 3612 if (!NewFD->isInvalidDecl()) 3613 Access = NewFD->getPreviousDeclaration()->getAccess(); 3614 3615 NewFD->setAccess(Access); 3616 if (FunctionTemplate) FunctionTemplate->setAccess(Access); 3617 3618 PrincipalDecl->setObjectOfFriendDecl(true); 3619 } 3620 3621 if (NewFD->isOverloadedOperator() && !DC->isRecord() && 3622 PrincipalDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary)) 3623 PrincipalDecl->setNonMemberOperator(); 3624 3625 // If we have a function template, check the template parameter 3626 // list. This will check and merge default template arguments. 3627 if (FunctionTemplate) { 3628 FunctionTemplateDecl *PrevTemplate = FunctionTemplate->getPreviousDeclaration(); 3629 CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(), 3630 PrevTemplate? PrevTemplate->getTemplateParameters() : 0, 3631 D.getDeclSpec().isFriendSpecified()? TPC_FriendFunctionTemplate 3632 : TPC_FunctionTemplate); 3633 } 3634 3635 if (D.getCXXScopeSpec().isSet() && !NewFD->isInvalidDecl()) { 3636 // Fake up an access specifier if it's supposed to be a class member. 3637 if (!Redeclaration && isa<CXXRecordDecl>(NewFD->getDeclContext())) 3638 NewFD->setAccess(AS_public); 3639 3640 // An out-of-line member function declaration must also be a 3641 // definition (C++ [dcl.meaning]p1). 3642 // Note that this is not the case for explicit specializations of 3643 // function templates or member functions of class templates, per 3644 // C++ [temp.expl.spec]p2. We also allow these declarations as an extension 3645 // for compatibility with old SWIG code which likes to generate them. 3646 if (!IsFunctionDefinition && !isFriend && 3647 !isFunctionTemplateSpecialization && !isExplicitSpecialization) { 3648 Diag(NewFD->getLocation(), diag::ext_out_of_line_declaration) 3649 << D.getCXXScopeSpec().getRange(); 3650 } 3651 if (!Redeclaration && !(isFriend && CurContext->isDependentContext())) { 3652 // The user tried to provide an out-of-line definition for a 3653 // function that is a member of a class or namespace, but there 3654 // was no such member function declared (C++ [class.mfct]p2, 3655 // C++ [namespace.memdef]p2). For example: 3656 // 3657 // class X { 3658 // void f() const; 3659 // }; 3660 // 3661 // void X::f() { } // ill-formed 3662 // 3663 // Complain about this problem, and attempt to suggest close 3664 // matches (e.g., those that differ only in cv-qualifiers and 3665 // whether the parameter types are references). 3666 Diag(D.getIdentifierLoc(), diag::err_member_def_does_not_match) 3667 << Name << DC << D.getCXXScopeSpec().getRange(); 3668 NewFD->setInvalidDecl(); 3669 3670 LookupResult Prev(*this, Name, D.getIdentifierLoc(), LookupOrdinaryName, 3671 ForRedeclaration); 3672 LookupQualifiedName(Prev, DC); 3673 assert(!Prev.isAmbiguous() && 3674 "Cannot have an ambiguity in previous-declaration lookup"); 3675 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 3676 Func != FuncEnd; ++Func) { 3677 if (isa<FunctionDecl>(*Func) && 3678 isNearlyMatchingFunction(Context, cast<FunctionDecl>(*Func), NewFD)) 3679 Diag((*Func)->getLocation(), diag::note_member_def_close_match); 3680 } 3681 } 3682 } 3683 3684 // Handle attributes. We need to have merged decls when handling attributes 3685 // (for example to check for conflicts, etc). 3686 // FIXME: This needs to happen before we merge declarations. Then, 3687 // let attribute merging cope with attribute conflicts. 3688 ProcessDeclAttributes(S, NewFD, D); 3689 3690 // attributes declared post-definition are currently ignored 3691 // FIXME: This should happen during attribute merging 3692 if (Redeclaration && Previous.isSingleResult()) { 3693 const FunctionDecl *Def; 3694 FunctionDecl *PrevFD = dyn_cast<FunctionDecl>(Previous.getFoundDecl()); 3695 if (PrevFD && PrevFD->hasBody(Def) && D.hasAttributes()) { 3696 Diag(NewFD->getLocation(), diag::warn_attribute_precede_definition); 3697 Diag(Def->getLocation(), diag::note_previous_definition); 3698 } 3699 } 3700 3701 AddKnownFunctionAttributes(NewFD); 3702 3703 if (OverloadableAttrRequired && !NewFD->hasAttr<OverloadableAttr>()) { 3704 // If a function name is overloadable in C, then every function 3705 // with that name must be marked "overloadable". 3706 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 3707 << Redeclaration << NewFD; 3708 if (!Previous.empty()) 3709 Diag(Previous.getRepresentativeDecl()->getLocation(), 3710 diag::note_attribute_overloadable_prev_overload); 3711 NewFD->addAttr(::new (Context) OverloadableAttr(SourceLocation(), Context)); 3712 } 3713 3714 if (NewFD->hasAttr<OverloadableAttr>() && 3715 !NewFD->getType()->getAs<FunctionProtoType>()) { 3716 Diag(NewFD->getLocation(), 3717 diag::err_attribute_overloadable_no_prototype) 3718 << NewFD; 3719 3720 // Turn this into a variadic function with no parameters. 3721 const FunctionType *FT = NewFD->getType()->getAs<FunctionType>(); 3722 QualType R = Context.getFunctionType(FT->getResultType(), 3723 0, 0, true, 0, false, false, 0, 0, 3724 FT->getExtInfo()); 3725 NewFD->setType(R); 3726 } 3727 3728 // If there's a #pragma GCC visibility in scope, and this isn't a class 3729 // member, set the visibility of this function. 3730 if (NewFD->getLinkage() == ExternalLinkage && !DC->isRecord()) 3731 AddPushedVisibilityAttribute(NewFD); 3732 3733 // If this is a locally-scoped extern C function, update the 3734 // map of such names. 3735 if (CurContext->isFunctionOrMethod() && NewFD->isExternC() 3736 && !NewFD->isInvalidDecl()) 3737 RegisterLocallyScopedExternCDecl(NewFD, Previous, S); 3738 3739 // Set this FunctionDecl's range up to the right paren. 3740 NewFD->setLocEnd(D.getSourceRange().getEnd()); 3741 3742 if (FunctionTemplate && NewFD->isInvalidDecl()) 3743 FunctionTemplate->setInvalidDecl(); 3744 3745 if (FunctionTemplate) 3746 return FunctionTemplate; 3747 3748 MarkUnusedFileScopedDecl(NewFD); 3749 3750 return NewFD; 3751} 3752 3753/// \brief Perform semantic checking of a new function declaration. 3754/// 3755/// Performs semantic analysis of the new function declaration 3756/// NewFD. This routine performs all semantic checking that does not 3757/// require the actual declarator involved in the declaration, and is 3758/// used both for the declaration of functions as they are parsed 3759/// (called via ActOnDeclarator) and for the declaration of functions 3760/// that have been instantiated via C++ template instantiation (called 3761/// via InstantiateDecl). 3762/// 3763/// \param IsExplicitSpecialiation whether this new function declaration is 3764/// an explicit specialization of the previous declaration. 3765/// 3766/// This sets NewFD->isInvalidDecl() to true if there was an error. 3767void Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD, 3768 LookupResult &Previous, 3769 bool IsExplicitSpecialization, 3770 bool &Redeclaration, 3771 bool &OverloadableAttrRequired) { 3772 // If NewFD is already known erroneous, don't do any of this checking. 3773 if (NewFD->isInvalidDecl()) { 3774 // If this is a class member, mark the class invalid immediately. 3775 // This avoids some consistency errors later. 3776 if (isa<CXXMethodDecl>(NewFD)) 3777 cast<CXXMethodDecl>(NewFD)->getParent()->setInvalidDecl(); 3778 3779 return; 3780 } 3781 3782 if (NewFD->getResultType()->isVariablyModifiedType()) { 3783 // Functions returning a variably modified type violate C99 6.7.5.2p2 3784 // because all functions have linkage. 3785 Diag(NewFD->getLocation(), diag::err_vm_func_decl); 3786 return NewFD->setInvalidDecl(); 3787 } 3788 3789 if (NewFD->isMain()) 3790 CheckMain(NewFD); 3791 3792 // Check for a previous declaration of this name. 3793 if (Previous.empty() && NewFD->isExternC()) { 3794 // Since we did not find anything by this name and we're declaring 3795 // an extern "C" function, look for a non-visible extern "C" 3796 // declaration with the same name. 3797 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3798 = LocallyScopedExternalDecls.find(NewFD->getDeclName()); 3799 if (Pos != LocallyScopedExternalDecls.end()) 3800 Previous.addDecl(Pos->second); 3801 } 3802 3803 // Merge or overload the declaration with an existing declaration of 3804 // the same name, if appropriate. 3805 if (!Previous.empty()) { 3806 // Determine whether NewFD is an overload of PrevDecl or 3807 // a declaration that requires merging. If it's an overload, 3808 // there's no more work to do here; we'll just add the new 3809 // function to the scope. 3810 3811 NamedDecl *OldDecl = 0; 3812 if (!AllowOverloadingOfFunction(Previous, Context)) { 3813 Redeclaration = true; 3814 OldDecl = Previous.getFoundDecl(); 3815 } else { 3816 if (!getLangOptions().CPlusPlus) 3817 OverloadableAttrRequired = true; 3818 3819 switch (CheckOverload(S, NewFD, Previous, OldDecl, 3820 /*NewIsUsingDecl*/ false)) { 3821 case Ovl_Match: 3822 Redeclaration = true; 3823 break; 3824 3825 case Ovl_NonFunction: 3826 Redeclaration = true; 3827 break; 3828 3829 case Ovl_Overload: 3830 Redeclaration = false; 3831 break; 3832 } 3833 } 3834 3835 if (Redeclaration) { 3836 // NewFD and OldDecl represent declarations that need to be 3837 // merged. 3838 if (MergeFunctionDecl(NewFD, OldDecl)) 3839 return NewFD->setInvalidDecl(); 3840 3841 Previous.clear(); 3842 Previous.addDecl(OldDecl); 3843 3844 if (FunctionTemplateDecl *OldTemplateDecl 3845 = dyn_cast<FunctionTemplateDecl>(OldDecl)) { 3846 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl()); 3847 FunctionTemplateDecl *NewTemplateDecl 3848 = NewFD->getDescribedFunctionTemplate(); 3849 assert(NewTemplateDecl && "Template/non-template mismatch"); 3850 if (CXXMethodDecl *Method 3851 = dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) { 3852 Method->setAccess(OldTemplateDecl->getAccess()); 3853 NewTemplateDecl->setAccess(OldTemplateDecl->getAccess()); 3854 } 3855 3856 // If this is an explicit specialization of a member that is a function 3857 // template, mark it as a member specialization. 3858 if (IsExplicitSpecialization && 3859 NewTemplateDecl->getInstantiatedFromMemberTemplate()) { 3860 NewTemplateDecl->setMemberSpecialization(); 3861 assert(OldTemplateDecl->isMemberSpecialization()); 3862 } 3863 } else { 3864 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions 3865 NewFD->setAccess(OldDecl->getAccess()); 3866 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 3867 } 3868 } 3869 } 3870 3871 // Semantic checking for this function declaration (in isolation). 3872 if (getLangOptions().CPlusPlus) { 3873 // C++-specific checks. 3874 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { 3875 CheckConstructor(Constructor); 3876 } else if (CXXDestructorDecl *Destructor = 3877 dyn_cast<CXXDestructorDecl>(NewFD)) { 3878 CXXRecordDecl *Record = Destructor->getParent(); 3879 QualType ClassType = Context.getTypeDeclType(Record); 3880 3881 // FIXME: Shouldn't we be able to perform this check even when the class 3882 // type is dependent? Both gcc and edg can handle that. 3883 if (!ClassType->isDependentType()) { 3884 DeclarationName Name 3885 = Context.DeclarationNames.getCXXDestructorName( 3886 Context.getCanonicalType(ClassType)); 3887// NewFD->getDeclName().dump(); 3888// Name.dump(); 3889 if (NewFD->getDeclName() != Name) { 3890 Diag(NewFD->getLocation(), diag::err_destructor_name); 3891 return NewFD->setInvalidDecl(); 3892 } 3893 } 3894 3895 Record->setUserDeclaredDestructor(true); 3896 // C++ [class]p4: A POD-struct is an aggregate class that has [...] no 3897 // user-defined destructor. 3898 Record->setPOD(false); 3899 3900 // C++ [class.dtor]p3: A destructor is trivial if it is an implicitly- 3901 // declared destructor. 3902 // FIXME: C++0x: don't do this for "= default" destructors 3903 Record->setHasTrivialDestructor(false); 3904 } else if (CXXConversionDecl *Conversion 3905 = dyn_cast<CXXConversionDecl>(NewFD)) { 3906 ActOnConversionDeclarator(Conversion); 3907 } 3908 3909 // Find any virtual functions that this function overrides. 3910 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) { 3911 if (!Method->isFunctionTemplateSpecialization() && 3912 !Method->getDescribedFunctionTemplate()) 3913 AddOverriddenMethods(Method->getParent(), Method); 3914 } 3915 3916 // Extra checking for C++ overloaded operators (C++ [over.oper]). 3917 if (NewFD->isOverloadedOperator() && 3918 CheckOverloadedOperatorDeclaration(NewFD)) 3919 return NewFD->setInvalidDecl(); 3920 3921 // Extra checking for C++0x literal operators (C++0x [over.literal]). 3922 if (NewFD->getLiteralIdentifier() && 3923 CheckLiteralOperatorDeclaration(NewFD)) 3924 return NewFD->setInvalidDecl(); 3925 3926 // In C++, check default arguments now that we have merged decls. Unless 3927 // the lexical context is the class, because in this case this is done 3928 // during delayed parsing anyway. 3929 if (!CurContext->isRecord()) 3930 CheckCXXDefaultArguments(NewFD); 3931 } 3932} 3933 3934void Sema::CheckMain(FunctionDecl* FD) { 3935 // C++ [basic.start.main]p3: A program that declares main to be inline 3936 // or static is ill-formed. 3937 // C99 6.7.4p4: In a hosted environment, the inline function specifier 3938 // shall not appear in a declaration of main. 3939 // static main is not an error under C99, but we should warn about it. 3940 bool isInline = FD->isInlineSpecified(); 3941 bool isStatic = FD->getStorageClass() == FunctionDecl::Static; 3942 if (isInline || isStatic) { 3943 unsigned diagID = diag::warn_unusual_main_decl; 3944 if (isInline || getLangOptions().CPlusPlus) 3945 diagID = diag::err_unusual_main_decl; 3946 3947 int which = isStatic + (isInline << 1) - 1; 3948 Diag(FD->getLocation(), diagID) << which; 3949 } 3950 3951 QualType T = FD->getType(); 3952 assert(T->isFunctionType() && "function decl is not of function type"); 3953 const FunctionType* FT = T->getAs<FunctionType>(); 3954 3955 if (!Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) { 3956 // TODO: add a replacement fixit to turn the return type into 'int'. 3957 Diag(FD->getTypeSpecStartLoc(), diag::err_main_returns_nonint); 3958 FD->setInvalidDecl(true); 3959 } 3960 3961 // Treat protoless main() as nullary. 3962 if (isa<FunctionNoProtoType>(FT)) return; 3963 3964 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT); 3965 unsigned nparams = FTP->getNumArgs(); 3966 assert(FD->getNumParams() == nparams); 3967 3968 bool HasExtraParameters = (nparams > 3); 3969 3970 // Darwin passes an undocumented fourth argument of type char**. If 3971 // other platforms start sprouting these, the logic below will start 3972 // getting shifty. 3973 if (nparams == 4 && 3974 Context.Target.getTriple().getOS() == llvm::Triple::Darwin) 3975 HasExtraParameters = false; 3976 3977 if (HasExtraParameters) { 3978 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams; 3979 FD->setInvalidDecl(true); 3980 nparams = 3; 3981 } 3982 3983 // FIXME: a lot of the following diagnostics would be improved 3984 // if we had some location information about types. 3985 3986 QualType CharPP = 3987 Context.getPointerType(Context.getPointerType(Context.CharTy)); 3988 QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP }; 3989 3990 for (unsigned i = 0; i < nparams; ++i) { 3991 QualType AT = FTP->getArgType(i); 3992 3993 bool mismatch = true; 3994 3995 if (Context.hasSameUnqualifiedType(AT, Expected[i])) 3996 mismatch = false; 3997 else if (Expected[i] == CharPP) { 3998 // As an extension, the following forms are okay: 3999 // char const ** 4000 // char const * const * 4001 // char * const * 4002 4003 QualifierCollector qs; 4004 const PointerType* PT; 4005 if ((PT = qs.strip(AT)->getAs<PointerType>()) && 4006 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) && 4007 (QualType(qs.strip(PT->getPointeeType()), 0) == Context.CharTy)) { 4008 qs.removeConst(); 4009 mismatch = !qs.empty(); 4010 } 4011 } 4012 4013 if (mismatch) { 4014 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i]; 4015 // TODO: suggest replacing given type with expected type 4016 FD->setInvalidDecl(true); 4017 } 4018 } 4019 4020 if (nparams == 1 && !FD->isInvalidDecl()) { 4021 Diag(FD->getLocation(), diag::warn_main_one_arg); 4022 } 4023} 4024 4025bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 4026 // FIXME: Need strict checking. In C89, we need to check for 4027 // any assignment, increment, decrement, function-calls, or 4028 // commas outside of a sizeof. In C99, it's the same list, 4029 // except that the aforementioned are allowed in unevaluated 4030 // expressions. Everything else falls under the 4031 // "may accept other forms of constant expressions" exception. 4032 // (We never end up here for C++, so the constant expression 4033 // rules there don't matter.) 4034 if (Init->isConstantInitializer(Context, false)) 4035 return false; 4036 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 4037 << Init->getSourceRange(); 4038 return true; 4039} 4040 4041void Sema::AddInitializerToDecl(DeclPtrTy dcl, ExprArg init) { 4042 AddInitializerToDecl(dcl, move(init), /*DirectInit=*/false); 4043} 4044 4045/// AddInitializerToDecl - Adds the initializer Init to the 4046/// declaration dcl. If DirectInit is true, this is C++ direct 4047/// initialization rather than copy initialization. 4048void Sema::AddInitializerToDecl(DeclPtrTy dcl, ExprArg init, bool DirectInit) { 4049 Decl *RealDecl = dcl.getAs<Decl>(); 4050 // If there is no declaration, there was an error parsing it. Just ignore 4051 // the initializer. 4052 if (RealDecl == 0) 4053 return; 4054 4055 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 4056 // With declarators parsed the way they are, the parser cannot 4057 // distinguish between a normal initializer and a pure-specifier. 4058 // Thus this grotesque test. 4059 IntegerLiteral *IL; 4060 Expr *Init = static_cast<Expr *>(init.get()); 4061 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 4062 Context.getCanonicalType(IL->getType()) == Context.IntTy) 4063 CheckPureMethod(Method, Init->getSourceRange()); 4064 else { 4065 Diag(Method->getLocation(), diag::err_member_function_initialization) 4066 << Method->getDeclName() << Init->getSourceRange(); 4067 Method->setInvalidDecl(); 4068 } 4069 return; 4070 } 4071 4072 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 4073 if (!VDecl) { 4074 if (getLangOptions().CPlusPlus && 4075 RealDecl->getLexicalDeclContext()->isRecord() && 4076 isa<NamedDecl>(RealDecl)) 4077 Diag(RealDecl->getLocation(), diag::err_member_initialization) 4078 << cast<NamedDecl>(RealDecl)->getDeclName(); 4079 else 4080 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 4081 RealDecl->setInvalidDecl(); 4082 return; 4083 } 4084 4085 // A definition must end up with a complete type, which means it must be 4086 // complete with the restriction that an array type might be completed by the 4087 // initializer; note that later code assumes this restriction. 4088 QualType BaseDeclType = VDecl->getType(); 4089 if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType)) 4090 BaseDeclType = Array->getElementType(); 4091 if (RequireCompleteType(VDecl->getLocation(), BaseDeclType, 4092 diag::err_typecheck_decl_incomplete_type)) { 4093 RealDecl->setInvalidDecl(); 4094 return; 4095 } 4096 4097 // The variable can not have an abstract class type. 4098 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 4099 diag::err_abstract_type_in_decl, 4100 AbstractVariableType)) 4101 VDecl->setInvalidDecl(); 4102 4103 const VarDecl *Def; 4104 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 4105 Diag(VDecl->getLocation(), diag::err_redefinition) 4106 << VDecl->getDeclName(); 4107 Diag(Def->getLocation(), diag::note_previous_definition); 4108 VDecl->setInvalidDecl(); 4109 return; 4110 } 4111 4112 if (getLangOptions().CPlusPlus && VDecl->hasLocalStorage()) 4113 setFunctionHasBranchProtectedScope(); 4114 4115 // Take ownership of the expression, now that we're sure we have somewhere 4116 // to put it. 4117 Expr *Init = init.takeAs<Expr>(); 4118 assert(Init && "missing initializer"); 4119 4120 // Capture the variable that is being initialized and the style of 4121 // initialization. 4122 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 4123 4124 // FIXME: Poor source location information. 4125 InitializationKind Kind 4126 = DirectInit? InitializationKind::CreateDirect(VDecl->getLocation(), 4127 Init->getLocStart(), 4128 Init->getLocEnd()) 4129 : InitializationKind::CreateCopy(VDecl->getLocation(), 4130 Init->getLocStart()); 4131 4132 // Get the decls type and save a reference for later, since 4133 // CheckInitializerTypes may change it. 4134 QualType DclT = VDecl->getType(), SavT = DclT; 4135 if (VDecl->isBlockVarDecl()) { 4136 if (VDecl->hasExternalStorage()) { // C99 6.7.8p5 4137 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 4138 VDecl->setInvalidDecl(); 4139 } else if (!VDecl->isInvalidDecl()) { 4140 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 4141 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 4142 MultiExprArg(*this, (void**)&Init, 1), 4143 &DclT); 4144 if (Result.isInvalid()) { 4145 VDecl->setInvalidDecl(); 4146 return; 4147 } 4148 4149 Init = Result.takeAs<Expr>(); 4150 4151 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 4152 // Don't check invalid declarations to avoid emitting useless diagnostics. 4153 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 4154 if (VDecl->getStorageClass() == VarDecl::Static) // C99 6.7.8p4. 4155 CheckForConstantInitializer(Init, DclT); 4156 } 4157 } 4158 } else if (VDecl->isStaticDataMember() && 4159 VDecl->getLexicalDeclContext()->isRecord()) { 4160 // This is an in-class initialization for a static data member, e.g., 4161 // 4162 // struct S { 4163 // static const int value = 17; 4164 // }; 4165 4166 // Attach the initializer 4167 VDecl->setInit(Init); 4168 4169 // C++ [class.mem]p4: 4170 // A member-declarator can contain a constant-initializer only 4171 // if it declares a static member (9.4) of const integral or 4172 // const enumeration type, see 9.4.2. 4173 QualType T = VDecl->getType(); 4174 if (!T->isDependentType() && 4175 (!Context.getCanonicalType(T).isConstQualified() || 4176 !T->isIntegralOrEnumerationType())) { 4177 Diag(VDecl->getLocation(), diag::err_member_initialization) 4178 << VDecl->getDeclName() << Init->getSourceRange(); 4179 VDecl->setInvalidDecl(); 4180 } else { 4181 // C++ [class.static.data]p4: 4182 // If a static data member is of const integral or const 4183 // enumeration type, its declaration in the class definition 4184 // can specify a constant-initializer which shall be an 4185 // integral constant expression (5.19). 4186 if (!Init->isTypeDependent() && 4187 !Init->getType()->isIntegralOrEnumerationType()) { 4188 // We have a non-dependent, non-integral or enumeration type. 4189 Diag(Init->getSourceRange().getBegin(), 4190 diag::err_in_class_initializer_non_integral_type) 4191 << Init->getType() << Init->getSourceRange(); 4192 VDecl->setInvalidDecl(); 4193 } else if (!Init->isTypeDependent() && !Init->isValueDependent()) { 4194 // Check whether the expression is a constant expression. 4195 llvm::APSInt Value; 4196 SourceLocation Loc; 4197 if (!Init->isIntegerConstantExpr(Value, Context, &Loc)) { 4198 Diag(Loc, diag::err_in_class_initializer_non_constant) 4199 << Init->getSourceRange(); 4200 VDecl->setInvalidDecl(); 4201 } else if (!VDecl->getType()->isDependentType()) 4202 ImpCastExprToType(Init, VDecl->getType(), CastExpr::CK_IntegralCast); 4203 } 4204 } 4205 } else if (VDecl->isFileVarDecl()) { 4206 if (VDecl->getStorageClass() == VarDecl::Extern && 4207 (!getLangOptions().CPlusPlus || 4208 !Context.getBaseElementType(VDecl->getType()).isConstQualified())) 4209 Diag(VDecl->getLocation(), diag::warn_extern_init); 4210 if (!VDecl->isInvalidDecl()) { 4211 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 4212 OwningExprResult Result = InitSeq.Perform(*this, Entity, Kind, 4213 MultiExprArg(*this, (void**)&Init, 1), 4214 &DclT); 4215 if (Result.isInvalid()) { 4216 VDecl->setInvalidDecl(); 4217 return; 4218 } 4219 4220 Init = Result.takeAs<Expr>(); 4221 } 4222 4223 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 4224 // Don't check invalid declarations to avoid emitting useless diagnostics. 4225 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 4226 // C99 6.7.8p4. All file scoped initializers need to be constant. 4227 CheckForConstantInitializer(Init, DclT); 4228 } 4229 } 4230 // If the type changed, it means we had an incomplete type that was 4231 // completed by the initializer. For example: 4232 // int ary[] = { 1, 3, 5 }; 4233 // "ary" transitions from a VariableArrayType to a ConstantArrayType. 4234 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 4235 VDecl->setType(DclT); 4236 Init->setType(DclT); 4237 } 4238 4239 Init = MaybeCreateCXXExprWithTemporaries(Init); 4240 // Attach the initializer to the decl. 4241 VDecl->setInit(Init); 4242 4243 if (getLangOptions().CPlusPlus) { 4244 if (!VDecl->isInvalidDecl() && 4245 !VDecl->getDeclContext()->isDependentContext() && 4246 VDecl->hasGlobalStorage() && 4247 !Init->isConstantInitializer(Context, 4248 VDecl->getType()->isReferenceType())) 4249 Diag(VDecl->getLocation(), diag::warn_global_constructor) 4250 << Init->getSourceRange(); 4251 4252 // Make sure we mark the destructor as used if necessary. 4253 QualType InitType = VDecl->getType(); 4254 while (const ArrayType *Array = Context.getAsArrayType(InitType)) 4255 InitType = Context.getBaseElementType(Array); 4256 if (const RecordType *Record = InitType->getAs<RecordType>()) 4257 FinalizeVarWithDestructor(VDecl, Record); 4258 } 4259 4260 return; 4261} 4262 4263/// ActOnInitializerError - Given that there was an error parsing an 4264/// initializer for the given declaration, try to return to some form 4265/// of sanity. 4266void Sema::ActOnInitializerError(DeclPtrTy dcl) { 4267 // Our main concern here is re-establishing invariants like "a 4268 // variable's type is either dependent or complete". 4269 Decl *D = dcl.getAs<Decl>(); 4270 if (!D || D->isInvalidDecl()) return; 4271 4272 VarDecl *VD = dyn_cast<VarDecl>(D); 4273 if (!VD) return; 4274 4275 QualType Ty = VD->getType(); 4276 if (Ty->isDependentType()) return; 4277 4278 // Require a complete type. 4279 if (RequireCompleteType(VD->getLocation(), 4280 Context.getBaseElementType(Ty), 4281 diag::err_typecheck_decl_incomplete_type)) { 4282 VD->setInvalidDecl(); 4283 return; 4284 } 4285 4286 // Require an abstract type. 4287 if (RequireNonAbstractType(VD->getLocation(), Ty, 4288 diag::err_abstract_type_in_decl, 4289 AbstractVariableType)) { 4290 VD->setInvalidDecl(); 4291 return; 4292 } 4293 4294 // Don't bother complaining about constructors or destructors, 4295 // though. 4296} 4297 4298void Sema::ActOnUninitializedDecl(DeclPtrTy dcl, 4299 bool TypeContainsUndeducedAuto) { 4300 Decl *RealDecl = dcl.getAs<Decl>(); 4301 4302 // If there is no declaration, there was an error parsing it. Just ignore it. 4303 if (RealDecl == 0) 4304 return; 4305 4306 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 4307 QualType Type = Var->getType(); 4308 4309 // C++0x [dcl.spec.auto]p3 4310 if (TypeContainsUndeducedAuto) { 4311 Diag(Var->getLocation(), diag::err_auto_var_requires_init) 4312 << Var->getDeclName() << Type; 4313 Var->setInvalidDecl(); 4314 return; 4315 } 4316 4317 switch (Var->isThisDeclarationADefinition()) { 4318 case VarDecl::Definition: 4319 if (!Var->isStaticDataMember() || !Var->getAnyInitializer()) 4320 break; 4321 4322 // We have an out-of-line definition of a static data member 4323 // that has an in-class initializer, so we type-check this like 4324 // a declaration. 4325 // 4326 // Fall through 4327 4328 case VarDecl::DeclarationOnly: 4329 // It's only a declaration. 4330 4331 // Block scope. C99 6.7p7: If an identifier for an object is 4332 // declared with no linkage (C99 6.2.2p6), the type for the 4333 // object shall be complete. 4334 if (!Type->isDependentType() && Var->isBlockVarDecl() && 4335 !Var->getLinkage() && !Var->isInvalidDecl() && 4336 RequireCompleteType(Var->getLocation(), Type, 4337 diag::err_typecheck_decl_incomplete_type)) 4338 Var->setInvalidDecl(); 4339 4340 // Make sure that the type is not abstract. 4341 if (!Type->isDependentType() && !Var->isInvalidDecl() && 4342 RequireNonAbstractType(Var->getLocation(), Type, 4343 diag::err_abstract_type_in_decl, 4344 AbstractVariableType)) 4345 Var->setInvalidDecl(); 4346 return; 4347 4348 case VarDecl::TentativeDefinition: 4349 // File scope. C99 6.9.2p2: A declaration of an identifier for an 4350 // object that has file scope without an initializer, and without a 4351 // storage-class specifier or with the storage-class specifier "static", 4352 // constitutes a tentative definition. Note: A tentative definition with 4353 // external linkage is valid (C99 6.2.2p5). 4354 if (!Var->isInvalidDecl()) { 4355 if (const IncompleteArrayType *ArrayT 4356 = Context.getAsIncompleteArrayType(Type)) { 4357 if (RequireCompleteType(Var->getLocation(), 4358 ArrayT->getElementType(), 4359 diag::err_illegal_decl_array_incomplete_type)) 4360 Var->setInvalidDecl(); 4361 } else if (Var->getStorageClass() == VarDecl::Static) { 4362 // C99 6.9.2p3: If the declaration of an identifier for an object is 4363 // a tentative definition and has internal linkage (C99 6.2.2p3), the 4364 // declared type shall not be an incomplete type. 4365 // NOTE: code such as the following 4366 // static struct s; 4367 // struct s { int a; }; 4368 // is accepted by gcc. Hence here we issue a warning instead of 4369 // an error and we do not invalidate the static declaration. 4370 // NOTE: to avoid multiple warnings, only check the first declaration. 4371 if (Var->getPreviousDeclaration() == 0) 4372 RequireCompleteType(Var->getLocation(), Type, 4373 diag::ext_typecheck_decl_incomplete_type); 4374 } 4375 } 4376 4377 // Record the tentative definition; we're done. 4378 if (!Var->isInvalidDecl()) 4379 TentativeDefinitions.push_back(Var); 4380 return; 4381 } 4382 4383 // Provide a specific diagnostic for uninitialized variable 4384 // definitions with incomplete array type. 4385 if (Type->isIncompleteArrayType()) { 4386 Diag(Var->getLocation(), 4387 diag::err_typecheck_incomplete_array_needs_initializer); 4388 Var->setInvalidDecl(); 4389 return; 4390 } 4391 4392 // Provide a specific diagnostic for uninitialized variable 4393 // definitions with reference type. 4394 if (Type->isReferenceType()) { 4395 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 4396 << Var->getDeclName() 4397 << SourceRange(Var->getLocation(), Var->getLocation()); 4398 Var->setInvalidDecl(); 4399 return; 4400 } 4401 4402 // Do not attempt to type-check the default initializer for a 4403 // variable with dependent type. 4404 if (Type->isDependentType()) 4405 return; 4406 4407 if (Var->isInvalidDecl()) 4408 return; 4409 4410 if (RequireCompleteType(Var->getLocation(), 4411 Context.getBaseElementType(Type), 4412 diag::err_typecheck_decl_incomplete_type)) { 4413 Var->setInvalidDecl(); 4414 return; 4415 } 4416 4417 // The variable can not have an abstract class type. 4418 if (RequireNonAbstractType(Var->getLocation(), Type, 4419 diag::err_abstract_type_in_decl, 4420 AbstractVariableType)) { 4421 Var->setInvalidDecl(); 4422 return; 4423 } 4424 4425 const RecordType *Record 4426 = Context.getBaseElementType(Type)->getAs<RecordType>(); 4427 if (Record && getLangOptions().CPlusPlus && !getLangOptions().CPlusPlus0x && 4428 cast<CXXRecordDecl>(Record->getDecl())->isPOD()) { 4429 // C++03 [dcl.init]p9: 4430 // If no initializer is specified for an object, and the 4431 // object is of (possibly cv-qualified) non-POD class type (or 4432 // array thereof), the object shall be default-initialized; if 4433 // the object is of const-qualified type, the underlying class 4434 // type shall have a user-declared default 4435 // constructor. Otherwise, if no initializer is specified for 4436 // a non- static object, the object and its subobjects, if 4437 // any, have an indeterminate initial value); if the object 4438 // or any of its subobjects are of const-qualified type, the 4439 // program is ill-formed. 4440 // FIXME: DPG thinks it is very fishy that C++0x disables this. 4441 } else { 4442 // Check for jumps past the implicit initializer. C++0x 4443 // clarifies that this applies to a "variable with automatic 4444 // storage duration", not a "local variable". 4445 if (getLangOptions().CPlusPlus && Var->hasLocalStorage()) 4446 setFunctionHasBranchProtectedScope(); 4447 4448 InitializedEntity Entity = InitializedEntity::InitializeVariable(Var); 4449 InitializationKind Kind 4450 = InitializationKind::CreateDefault(Var->getLocation()); 4451 4452 InitializationSequence InitSeq(*this, Entity, Kind, 0, 0); 4453 OwningExprResult Init = InitSeq.Perform(*this, Entity, Kind, 4454 MultiExprArg(*this, 0, 0)); 4455 if (Init.isInvalid()) 4456 Var->setInvalidDecl(); 4457 else if (Init.get()) { 4458 Var->setInit(MaybeCreateCXXExprWithTemporaries(Init.takeAs<Expr>())); 4459 4460 if (getLangOptions().CPlusPlus && !Var->isInvalidDecl() && 4461 Var->hasGlobalStorage() && 4462 !Var->getDeclContext()->isDependentContext() && 4463 !Var->getInit()->isConstantInitializer(Context, false)) 4464 Diag(Var->getLocation(), diag::warn_global_constructor); 4465 } 4466 } 4467 4468 if (!Var->isInvalidDecl() && getLangOptions().CPlusPlus && Record) 4469 FinalizeVarWithDestructor(Var, Record); 4470 } 4471} 4472 4473Sema::DeclGroupPtrTy Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, 4474 DeclPtrTy *Group, 4475 unsigned NumDecls) { 4476 llvm::SmallVector<Decl*, 8> Decls; 4477 4478 if (DS.isTypeSpecOwned()) 4479 Decls.push_back((Decl*)DS.getTypeRep()); 4480 4481 for (unsigned i = 0; i != NumDecls; ++i) 4482 if (Decl *D = Group[i].getAs<Decl>()) 4483 Decls.push_back(D); 4484 4485 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, 4486 Decls.data(), Decls.size())); 4487} 4488 4489 4490/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 4491/// to introduce parameters into function prototype scope. 4492Sema::DeclPtrTy 4493Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 4494 const DeclSpec &DS = D.getDeclSpec(); 4495 4496 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 4497 VarDecl::StorageClass StorageClass = VarDecl::None; 4498 VarDecl::StorageClass StorageClassAsWritten = VarDecl::None; 4499 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 4500 StorageClass = VarDecl::Register; 4501 StorageClassAsWritten = VarDecl::Register; 4502 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 4503 Diag(DS.getStorageClassSpecLoc(), 4504 diag::err_invalid_storage_class_in_func_decl); 4505 D.getMutableDeclSpec().ClearStorageClassSpecs(); 4506 } 4507 4508 if (D.getDeclSpec().isThreadSpecified()) 4509 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 4510 4511 DiagnoseFunctionSpecifiers(D); 4512 4513 // Check that there are no default arguments inside the type of this 4514 // parameter (C++ only). 4515 if (getLangOptions().CPlusPlus) 4516 CheckExtraCXXDefaultArguments(D); 4517 4518 TagDecl *OwnedDecl = 0; 4519 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S, &OwnedDecl); 4520 QualType parmDeclType = TInfo->getType(); 4521 4522 if (getLangOptions().CPlusPlus && OwnedDecl && OwnedDecl->isDefinition()) { 4523 // C++ [dcl.fct]p6: 4524 // Types shall not be defined in return or parameter types. 4525 Diag(OwnedDecl->getLocation(), diag::err_type_defined_in_param_type) 4526 << Context.getTypeDeclType(OwnedDecl); 4527 } 4528 4529 // Check for redeclaration of parameters, e.g. int foo(int x, int x); 4530 IdentifierInfo *II = D.getIdentifier(); 4531 if (II) { 4532 LookupResult R(*this, II, D.getIdentifierLoc(), LookupOrdinaryName, 4533 ForRedeclaration); 4534 LookupName(R, S); 4535 if (R.isSingleResult()) { 4536 NamedDecl *PrevDecl = R.getFoundDecl(); 4537 if (PrevDecl->isTemplateParameter()) { 4538 // Maybe we will complain about the shadowed template parameter. 4539 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 4540 // Just pretend that we didn't see the previous declaration. 4541 PrevDecl = 0; 4542 } else if (S->isDeclScope(DeclPtrTy::make(PrevDecl))) { 4543 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 4544 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 4545 4546 // Recover by removing the name 4547 II = 0; 4548 D.SetIdentifier(0, D.getIdentifierLoc()); 4549 D.setInvalidType(true); 4550 } 4551 } 4552 } 4553 4554 // Temporarily put parameter variables in the translation unit, not 4555 // the enclosing context. This prevents them from accidentally 4556 // looking like class members in C++. 4557 ParmVarDecl *New = CheckParameter(Context.getTranslationUnitDecl(), 4558 TInfo, parmDeclType, II, 4559 D.getIdentifierLoc(), 4560 StorageClass, StorageClassAsWritten); 4561 4562 if (D.isInvalidType()) 4563 New->setInvalidDecl(); 4564 4565 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 4566 if (D.getCXXScopeSpec().isSet()) { 4567 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 4568 << D.getCXXScopeSpec().getRange(); 4569 New->setInvalidDecl(); 4570 } 4571 4572 // Add the parameter declaration into this scope. 4573 S->AddDecl(DeclPtrTy::make(New)); 4574 if (II) 4575 IdResolver.AddDecl(New); 4576 4577 ProcessDeclAttributes(S, New, D); 4578 4579 if (New->hasAttr<BlocksAttr>()) { 4580 Diag(New->getLocation(), diag::err_block_on_nonlocal); 4581 } 4582 return DeclPtrTy::make(New); 4583} 4584 4585/// \brief Synthesizes a variable for a parameter arising from a 4586/// typedef. 4587ParmVarDecl *Sema::BuildParmVarDeclForTypedef(DeclContext *DC, 4588 SourceLocation Loc, 4589 QualType T) { 4590 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, Loc, 0, 4591 T, Context.getTrivialTypeSourceInfo(T, Loc), 4592 VarDecl::None, VarDecl::None, 0); 4593 Param->setImplicit(); 4594 return Param; 4595} 4596 4597ParmVarDecl *Sema::CheckParameter(DeclContext *DC, 4598 TypeSourceInfo *TSInfo, QualType T, 4599 IdentifierInfo *Name, 4600 SourceLocation NameLoc, 4601 VarDecl::StorageClass StorageClass, 4602 VarDecl::StorageClass StorageClassAsWritten) { 4603 ParmVarDecl *New = ParmVarDecl::Create(Context, DC, NameLoc, Name, 4604 adjustParameterType(T), TSInfo, 4605 StorageClass, StorageClassAsWritten, 4606 0); 4607 4608 // Parameters can not be abstract class types. 4609 // For record types, this is done by the AbstractClassUsageDiagnoser once 4610 // the class has been completely parsed. 4611 if (!CurContext->isRecord() && 4612 RequireNonAbstractType(NameLoc, T, diag::err_abstract_type_in_decl, 4613 AbstractParamType)) 4614 New->setInvalidDecl(); 4615 4616 // Parameter declarators cannot be interface types. All ObjC objects are 4617 // passed by reference. 4618 if (T->isObjCObjectType()) { 4619 Diag(NameLoc, 4620 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T; 4621 New->setInvalidDecl(); 4622 } 4623 4624 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage 4625 // duration shall not be qualified by an address-space qualifier." 4626 // Since all parameters have automatic store duration, they can not have 4627 // an address space. 4628 if (T.getAddressSpace() != 0) { 4629 Diag(NameLoc, diag::err_arg_with_address_space); 4630 New->setInvalidDecl(); 4631 } 4632 4633 return New; 4634} 4635 4636void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 4637 SourceLocation LocAfterDecls) { 4638 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 4639 "Not a function declarator!"); 4640 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 4641 4642 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 4643 // for a K&R function. 4644 if (!FTI.hasPrototype) { 4645 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 4646 --i; 4647 if (FTI.ArgInfo[i].Param == 0) { 4648 llvm::SmallString<256> Code; 4649 llvm::raw_svector_ostream(Code) << " int " 4650 << FTI.ArgInfo[i].Ident->getName() 4651 << ";\n"; 4652 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 4653 << FTI.ArgInfo[i].Ident 4654 << FixItHint::CreateInsertion(LocAfterDecls, Code.str()); 4655 4656 // Implicitly declare the argument as type 'int' for lack of a better 4657 // type. 4658 DeclSpec DS; 4659 const char* PrevSpec; // unused 4660 unsigned DiagID; // unused 4661 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 4662 PrevSpec, DiagID); 4663 Declarator ParamD(DS, Declarator::KNRTypeListContext); 4664 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 4665 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 4666 } 4667 } 4668 } 4669} 4670 4671Sema::DeclPtrTy Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, 4672 Declarator &D) { 4673 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 4674 assert(D.getTypeObject(0).Kind == DeclaratorChunk::Function && 4675 "Not a function declarator!"); 4676 DeclaratorChunk::FunctionTypeInfo &FTI = D.getTypeObject(0).Fun; 4677 4678 if (FTI.hasPrototype) { 4679 // FIXME: Diagnose arguments without names in C. 4680 } 4681 4682 Scope *ParentScope = FnBodyScope->getParent(); 4683 4684 DeclPtrTy DP = HandleDeclarator(ParentScope, D, 4685 MultiTemplateParamsArg(*this), 4686 /*IsFunctionDefinition=*/true); 4687 return ActOnStartOfFunctionDef(FnBodyScope, DP); 4688} 4689 4690static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD) { 4691 // Don't warn about invalid declarations. 4692 if (FD->isInvalidDecl()) 4693 return false; 4694 4695 // Or declarations that aren't global. 4696 if (!FD->isGlobal()) 4697 return false; 4698 4699 // Don't warn about C++ member functions. 4700 if (isa<CXXMethodDecl>(FD)) 4701 return false; 4702 4703 // Don't warn about 'main'. 4704 if (FD->isMain()) 4705 return false; 4706 4707 // Don't warn about inline functions. 4708 if (FD->isInlineSpecified()) 4709 return false; 4710 4711 // Don't warn about function templates. 4712 if (FD->getDescribedFunctionTemplate()) 4713 return false; 4714 4715 // Don't warn about function template specializations. 4716 if (FD->isFunctionTemplateSpecialization()) 4717 return false; 4718 4719 bool MissingPrototype = true; 4720 for (const FunctionDecl *Prev = FD->getPreviousDeclaration(); 4721 Prev; Prev = Prev->getPreviousDeclaration()) { 4722 // Ignore any declarations that occur in function or method 4723 // scope, because they aren't visible from the header. 4724 if (Prev->getDeclContext()->isFunctionOrMethod()) 4725 continue; 4726 4727 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 4728 break; 4729 } 4730 4731 return MissingPrototype; 4732} 4733 4734Sema::DeclPtrTy Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, DeclPtrTy D) { 4735 // Clear the last template instantiation error context. 4736 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation(); 4737 4738 if (!D) 4739 return D; 4740 FunctionDecl *FD = 0; 4741 4742 if (FunctionTemplateDecl *FunTmpl 4743 = dyn_cast<FunctionTemplateDecl>(D.getAs<Decl>())) 4744 FD = FunTmpl->getTemplatedDecl(); 4745 else 4746 FD = cast<FunctionDecl>(D.getAs<Decl>()); 4747 4748 // Enter a new function scope 4749 PushFunctionScope(); 4750 4751 // See if this is a redefinition. 4752 // But don't complain if we're in GNU89 mode and the previous definition 4753 // was an extern inline function. 4754 const FunctionDecl *Definition; 4755 if (FD->hasBody(Definition) && 4756 !canRedefineFunction(Definition, getLangOptions())) { 4757 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 4758 Diag(Definition->getLocation(), diag::note_previous_definition); 4759 } 4760 4761 // Builtin functions cannot be defined. 4762 if (unsigned BuiltinID = FD->getBuiltinID()) { 4763 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 4764 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 4765 FD->setInvalidDecl(); 4766 } 4767 } 4768 4769 // The return type of a function definition must be complete 4770 // (C99 6.9.1p3, C++ [dcl.fct]p6). 4771 QualType ResultType = FD->getResultType(); 4772 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 4773 !FD->isInvalidDecl() && 4774 RequireCompleteType(FD->getLocation(), ResultType, 4775 diag::err_func_def_incomplete_result)) 4776 FD->setInvalidDecl(); 4777 4778 // GNU warning -Wmissing-prototypes: 4779 // Warn if a global function is defined without a previous 4780 // prototype declaration. This warning is issued even if the 4781 // definition itself provides a prototype. The aim is to detect 4782 // global functions that fail to be declared in header files. 4783 if (ShouldWarnAboutMissingPrototype(FD)) 4784 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 4785 4786 if (FnBodyScope) 4787 PushDeclContext(FnBodyScope, FD); 4788 4789 // Check the validity of our function parameters 4790 CheckParmsForFunctionDef(FD); 4791 4792 bool ShouldCheckShadow = 4793 Diags.getDiagnosticLevel(diag::warn_decl_shadow) != Diagnostic::Ignored; 4794 4795 // Introduce our parameters into the function scope 4796 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 4797 ParmVarDecl *Param = FD->getParamDecl(p); 4798 Param->setOwningFunction(FD); 4799 4800 // If this has an identifier, add it to the scope stack. 4801 if (Param->getIdentifier() && FnBodyScope) { 4802 if (ShouldCheckShadow) 4803 CheckShadow(FnBodyScope, Param); 4804 4805 PushOnScopeChains(Param, FnBodyScope); 4806 } 4807 } 4808 4809 // Checking attributes of current function definition 4810 // dllimport attribute. 4811 DLLImportAttr *DA = FD->getAttr<DLLImportAttr>(); 4812 if (DA && (!FD->getAttr<DLLExportAttr>())) { 4813 // dllimport attribute cannot be directly applied to definition. 4814 if (!DA->isInherited()) { 4815 Diag(FD->getLocation(), 4816 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 4817 << "dllimport"; 4818 FD->setInvalidDecl(); 4819 return DeclPtrTy::make(FD); 4820 } 4821 4822 // Visual C++ appears to not think this is an issue, so only issue 4823 // a warning when Microsoft extensions are disabled. 4824 if (!LangOpts.Microsoft) { 4825 // If a symbol previously declared dllimport is later defined, the 4826 // attribute is ignored in subsequent references, and a warning is 4827 // emitted. 4828 Diag(FD->getLocation(), 4829 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 4830 << FD->getName() << "dllimport"; 4831 } 4832 } 4833 return DeclPtrTy::make(FD); 4834} 4835 4836/// \brief Given the set of return statements within a function body, 4837/// compute the variables that are subject to the named return value 4838/// optimization. 4839/// 4840/// Each of the variables that is subject to the named return value 4841/// optimization will be marked as NRVO variables in the AST, and any 4842/// return statement that has a marked NRVO variable as its NRVO candidate can 4843/// use the named return value optimization. 4844/// 4845/// This function applies a very simplistic algorithm for NRVO: if every return 4846/// statement in the function has the same NRVO candidate, that candidate is 4847/// the NRVO variable. 4848/// 4849/// FIXME: Employ a smarter algorithm that accounts for multiple return 4850/// statements and the lifetimes of the NRVO candidates. We should be able to 4851/// find a maximal set of NRVO variables. 4852static void ComputeNRVO(Stmt *Body, ReturnStmt **Returns, unsigned NumReturns) { 4853 const VarDecl *NRVOCandidate = 0; 4854 for (unsigned I = 0; I != NumReturns; ++I) { 4855 if (!Returns[I]->getNRVOCandidate()) 4856 return; 4857 4858 if (!NRVOCandidate) 4859 NRVOCandidate = Returns[I]->getNRVOCandidate(); 4860 else if (NRVOCandidate != Returns[I]->getNRVOCandidate()) 4861 return; 4862 } 4863 4864 if (NRVOCandidate) 4865 const_cast<VarDecl*>(NRVOCandidate)->setNRVOVariable(true); 4866} 4867 4868Sema::DeclPtrTy Sema::ActOnFinishFunctionBody(DeclPtrTy D, StmtArg BodyArg) { 4869 return ActOnFinishFunctionBody(D, move(BodyArg), false); 4870} 4871 4872Sema::DeclPtrTy Sema::ActOnFinishFunctionBody(DeclPtrTy D, StmtArg BodyArg, 4873 bool IsInstantiation) { 4874 Decl *dcl = D.getAs<Decl>(); 4875 Stmt *Body = BodyArg.takeAs<Stmt>(); 4876 4877 FunctionDecl *FD = 0; 4878 FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl); 4879 if (FunTmpl) 4880 FD = FunTmpl->getTemplatedDecl(); 4881 else 4882 FD = dyn_cast_or_null<FunctionDecl>(dcl); 4883 4884 sema::AnalysisBasedWarnings::Policy WP = AnalysisWarnings.getDefaultPolicy(); 4885 4886 if (FD) { 4887 FD->setBody(Body); 4888 if (FD->isMain()) { 4889 // C and C++ allow for main to automagically return 0. 4890 // Implements C++ [basic.start.main]p5 and C99 5.1.2.2.3. 4891 FD->setHasImplicitReturnZero(true); 4892 WP.disableCheckFallThrough(); 4893 } 4894 4895 if (!FD->isInvalidDecl()) { 4896 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end()); 4897 4898 // If this is a constructor, we need a vtable. 4899 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(FD)) 4900 MarkVTableUsed(FD->getLocation(), Constructor->getParent()); 4901 4902 ComputeNRVO(Body, FunctionScopes.back()->Returns.data(), 4903 FunctionScopes.back()->Returns.size()); 4904 } 4905 4906 assert(FD == getCurFunctionDecl() && "Function parsing confused"); 4907 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 4908 assert(MD == getCurMethodDecl() && "Method parsing confused"); 4909 MD->setBody(Body); 4910 MD->setEndLoc(Body->getLocEnd()); 4911 if (!MD->isInvalidDecl()) 4912 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end()); 4913 } else { 4914 return DeclPtrTy(); 4915 } 4916 4917 // Verify and clean out per-function state. 4918 4919 // Check goto/label use. 4920 for (llvm::DenseMap<IdentifierInfo*, LabelStmt*>::iterator 4921 I = getLabelMap().begin(), E = getLabelMap().end(); I != E; ++I) { 4922 LabelStmt *L = I->second; 4923 4924 // Verify that we have no forward references left. If so, there was a goto 4925 // or address of a label taken, but no definition of it. Label fwd 4926 // definitions are indicated with a null substmt. 4927 if (L->getSubStmt() != 0) 4928 continue; 4929 4930 // Emit error. 4931 Diag(L->getIdentLoc(), diag::err_undeclared_label_use) << L->getName(); 4932 4933 // At this point, we have gotos that use the bogus label. Stitch it into 4934 // the function body so that they aren't leaked and that the AST is well 4935 // formed. 4936 if (Body == 0) { 4937 // The whole function wasn't parsed correctly. 4938 continue; 4939 } 4940 4941 // Otherwise, the body is valid: we want to stitch the label decl into the 4942 // function somewhere so that it is properly owned and so that the goto 4943 // has a valid target. Do this by creating a new compound stmt with the 4944 // label in it. 4945 4946 // Give the label a sub-statement. 4947 L->setSubStmt(new (Context) NullStmt(L->getIdentLoc())); 4948 4949 CompoundStmt *Compound = isa<CXXTryStmt>(Body) ? 4950 cast<CXXTryStmt>(Body)->getTryBlock() : 4951 cast<CompoundStmt>(Body); 4952 llvm::SmallVector<Stmt*, 64> Elements(Compound->body_begin(), 4953 Compound->body_end()); 4954 Elements.push_back(L); 4955 Compound->setStmts(Context, Elements.data(), Elements.size()); 4956 } 4957 4958 if (Body) { 4959 // C++ constructors that have function-try-blocks can't have return 4960 // statements in the handlers of that block. (C++ [except.handle]p14) 4961 // Verify this. 4962 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body)) 4963 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); 4964 4965 // Verify that that gotos and switch cases don't jump into scopes illegally. 4966 // Verify that that gotos and switch cases don't jump into scopes illegally. 4967 if (FunctionNeedsScopeChecking() && 4968 !dcl->isInvalidDecl() && 4969 !hasAnyErrorsInThisFunction()) 4970 DiagnoseInvalidJumps(Body); 4971 4972 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) { 4973 if (!Destructor->getParent()->isDependentType()) 4974 CheckDestructor(Destructor); 4975 4976 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 4977 Destructor->getParent()); 4978 } 4979 4980 // If any errors have occurred, clear out any temporaries that may have 4981 // been leftover. This ensures that these temporaries won't be picked up for 4982 // deletion in some later function. 4983 if (PP.getDiagnostics().hasErrorOccurred()) 4984 ExprTemporaries.clear(); 4985 else if (!isa<FunctionTemplateDecl>(dcl)) { 4986 // Since the body is valid, issue any analysis-based warnings that are 4987 // enabled. 4988 QualType ResultType; 4989 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(dcl)) { 4990 ResultType = FD->getResultType(); 4991 } 4992 else { 4993 ObjCMethodDecl *MD = cast<ObjCMethodDecl>(dcl); 4994 ResultType = MD->getResultType(); 4995 } 4996 AnalysisWarnings.IssueWarnings(WP, dcl); 4997 } 4998 4999 assert(ExprTemporaries.empty() && "Leftover temporaries in function"); 5000 } 5001 5002 if (!IsInstantiation) 5003 PopDeclContext(); 5004 5005 PopFunctionOrBlockScope(); 5006 5007 // If any errors have occurred, clear out any temporaries that may have 5008 // been leftover. This ensures that these temporaries won't be picked up for 5009 // deletion in some later function. 5010 if (getDiagnostics().hasErrorOccurred()) 5011 ExprTemporaries.clear(); 5012 5013 return D; 5014} 5015 5016/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 5017/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 5018NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 5019 IdentifierInfo &II, Scope *S) { 5020 // Before we produce a declaration for an implicitly defined 5021 // function, see whether there was a locally-scoped declaration of 5022 // this name as a function or variable. If so, use that 5023 // (non-visible) declaration, and complain about it. 5024 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 5025 = LocallyScopedExternalDecls.find(&II); 5026 if (Pos != LocallyScopedExternalDecls.end()) { 5027 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 5028 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 5029 return Pos->second; 5030 } 5031 5032 // Extension in C99. Legal in C90, but warn about it. 5033 if (II.getName().startswith("__builtin_")) 5034 Diag(Loc, diag::warn_builtin_unknown) << &II; 5035 else if (getLangOptions().C99) 5036 Diag(Loc, diag::ext_implicit_function_decl) << &II; 5037 else 5038 Diag(Loc, diag::warn_implicit_function_decl) << &II; 5039 5040 // Set a Declarator for the implicit definition: int foo(); 5041 const char *Dummy; 5042 DeclSpec DS; 5043 unsigned DiagID; 5044 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID); 5045 Error = Error; // Silence warning. 5046 assert(!Error && "Error setting up implicit decl!"); 5047 Declarator D(DS, Declarator::BlockContext); 5048 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0, 5049 0, 0, false, SourceLocation(), 5050 false, 0,0,0, Loc, Loc, D), 5051 SourceLocation()); 5052 D.SetIdentifier(&II, Loc); 5053 5054 // Insert this function into translation-unit scope. 5055 5056 DeclContext *PrevDC = CurContext; 5057 CurContext = Context.getTranslationUnitDecl(); 5058 5059 FunctionDecl *FD = 5060 dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D).getAs<Decl>()); 5061 FD->setImplicit(); 5062 5063 CurContext = PrevDC; 5064 5065 AddKnownFunctionAttributes(FD); 5066 5067 return FD; 5068} 5069 5070/// \brief Adds any function attributes that we know a priori based on 5071/// the declaration of this function. 5072/// 5073/// These attributes can apply both to implicitly-declared builtins 5074/// (like __builtin___printf_chk) or to library-declared functions 5075/// like NSLog or printf. 5076void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 5077 if (FD->isInvalidDecl()) 5078 return; 5079 5080 // If this is a built-in function, map its builtin attributes to 5081 // actual attributes. 5082 if (unsigned BuiltinID = FD->getBuiltinID()) { 5083 // Handle printf-formatting attributes. 5084 unsigned FormatIdx; 5085 bool HasVAListArg; 5086 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 5087 if (!FD->getAttr<FormatAttr>()) 5088 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 5089 "printf", FormatIdx+1, 5090 HasVAListArg ? 0 : FormatIdx+2)); 5091 } 5092 if (Context.BuiltinInfo.isScanfLike(BuiltinID, FormatIdx, 5093 HasVAListArg)) { 5094 if (!FD->getAttr<FormatAttr>()) 5095 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 5096 "scanf", FormatIdx+1, 5097 HasVAListArg ? 0 : FormatIdx+2)); 5098 } 5099 5100 // Mark const if we don't care about errno and that is the only 5101 // thing preventing the function from being const. This allows 5102 // IRgen to use LLVM intrinsics for such functions. 5103 if (!getLangOptions().MathErrno && 5104 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 5105 if (!FD->getAttr<ConstAttr>()) 5106 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 5107 } 5108 5109 if (Context.BuiltinInfo.isNoReturn(BuiltinID)) 5110 FD->setType(Context.getNoReturnType(FD->getType())); 5111 if (Context.BuiltinInfo.isNoThrow(BuiltinID)) 5112 FD->addAttr(::new (Context) NoThrowAttr(FD->getLocation(), Context)); 5113 if (Context.BuiltinInfo.isConst(BuiltinID)) 5114 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 5115 } 5116 5117 IdentifierInfo *Name = FD->getIdentifier(); 5118 if (!Name) 5119 return; 5120 if ((!getLangOptions().CPlusPlus && 5121 FD->getDeclContext()->isTranslationUnit()) || 5122 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 5123 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 5124 LinkageSpecDecl::lang_c)) { 5125 // Okay: this could be a libc/libm/Objective-C function we know 5126 // about. 5127 } else 5128 return; 5129 5130 if (Name->isStr("NSLog") || Name->isStr("NSLogv")) { 5131 // FIXME: NSLog and NSLogv should be target specific 5132 if (const FormatAttr *Format = FD->getAttr<FormatAttr>()) { 5133 // FIXME: We known better than our headers. 5134 const_cast<FormatAttr *>(Format)->setType(Context, "printf"); 5135 } else 5136 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 5137 "printf", 1, 5138 Name->isStr("NSLogv") ? 0 : 2)); 5139 } else if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { 5140 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be 5141 // target-specific builtins, perhaps? 5142 if (!FD->getAttr<FormatAttr>()) 5143 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 5144 "printf", 2, 5145 Name->isStr("vasprintf") ? 0 : 3)); 5146 } 5147} 5148 5149TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 5150 TypeSourceInfo *TInfo) { 5151 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 5152 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 5153 5154 if (!TInfo) { 5155 assert(D.isInvalidType() && "no declarator info for valid type"); 5156 TInfo = Context.getTrivialTypeSourceInfo(T); 5157 } 5158 5159 // Scope manipulation handled by caller. 5160 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 5161 D.getIdentifierLoc(), 5162 D.getIdentifier(), 5163 TInfo); 5164 5165 if (const TagType *TT = T->getAs<TagType>()) { 5166 TagDecl *TD = TT->getDecl(); 5167 5168 // If the TagDecl that the TypedefDecl points to is an anonymous decl 5169 // keep track of the TypedefDecl. 5170 if (!TD->getIdentifier() && !TD->getTypedefForAnonDecl()) 5171 TD->setTypedefForAnonDecl(NewTD); 5172 } 5173 5174 if (D.isInvalidType()) 5175 NewTD->setInvalidDecl(); 5176 return NewTD; 5177} 5178 5179 5180/// \brief Determine whether a tag with a given kind is acceptable 5181/// as a redeclaration of the given tag declaration. 5182/// 5183/// \returns true if the new tag kind is acceptable, false otherwise. 5184bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, 5185 TagTypeKind NewTag, 5186 SourceLocation NewTagLoc, 5187 const IdentifierInfo &Name) { 5188 // C++ [dcl.type.elab]p3: 5189 // The class-key or enum keyword present in the 5190 // elaborated-type-specifier shall agree in kind with the 5191 // declaration to which the name in the elaborated-type-specifier 5192 // refers. This rule also applies to the form of 5193 // elaborated-type-specifier that declares a class-name or 5194 // friend class since it can be construed as referring to the 5195 // definition of the class. Thus, in any 5196 // elaborated-type-specifier, the enum keyword shall be used to 5197 // refer to an enumeration (7.2), the union class-key shall be 5198 // used to refer to a union (clause 9), and either the class or 5199 // struct class-key shall be used to refer to a class (clause 9) 5200 // declared using the class or struct class-key. 5201 TagTypeKind OldTag = Previous->getTagKind(); 5202 if (OldTag == NewTag) 5203 return true; 5204 5205 if ((OldTag == TTK_Struct || OldTag == TTK_Class) && 5206 (NewTag == TTK_Struct || NewTag == TTK_Class)) { 5207 // Warn about the struct/class tag mismatch. 5208 bool isTemplate = false; 5209 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) 5210 isTemplate = Record->getDescribedClassTemplate(); 5211 5212 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 5213 << (NewTag == TTK_Class) 5214 << isTemplate << &Name 5215 << FixItHint::CreateReplacement(SourceRange(NewTagLoc), 5216 OldTag == TTK_Class? "class" : "struct"); 5217 Diag(Previous->getLocation(), diag::note_previous_use); 5218 return true; 5219 } 5220 return false; 5221} 5222 5223/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 5224/// former case, Name will be non-null. In the later case, Name will be null. 5225/// TagSpec indicates what kind of tag this is. TUK indicates whether this is a 5226/// reference/declaration/definition of a tag. 5227Sema::DeclPtrTy Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK, 5228 SourceLocation KWLoc, CXXScopeSpec &SS, 5229 IdentifierInfo *Name, SourceLocation NameLoc, 5230 AttributeList *Attr, AccessSpecifier AS, 5231 MultiTemplateParamsArg TemplateParameterLists, 5232 bool &OwnedDecl, bool &IsDependent) { 5233 // If this is not a definition, it must have a name. 5234 assert((Name != 0 || TUK == TUK_Definition) && 5235 "Nameless record must be a definition!"); 5236 5237 OwnedDecl = false; 5238 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 5239 5240 // FIXME: Check explicit specializations more carefully. 5241 bool isExplicitSpecialization = false; 5242 unsigned NumMatchedTemplateParamLists = TemplateParameterLists.size(); 5243 bool Invalid = false; 5244 if (TUK != TUK_Reference) { 5245 if (TemplateParameterList *TemplateParams 5246 = MatchTemplateParametersToScopeSpecifier(KWLoc, SS, 5247 (TemplateParameterList**)TemplateParameterLists.get(), 5248 TemplateParameterLists.size(), 5249 TUK == TUK_Friend, 5250 isExplicitSpecialization, 5251 Invalid)) { 5252 // All but one template parameter lists have been matching. 5253 --NumMatchedTemplateParamLists; 5254 5255 if (TemplateParams->size() > 0) { 5256 // This is a declaration or definition of a class template (which may 5257 // be a member of another template). 5258 if (Invalid) 5259 return DeclPtrTy(); 5260 5261 OwnedDecl = false; 5262 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc, 5263 SS, Name, NameLoc, Attr, 5264 TemplateParams, 5265 AS); 5266 TemplateParameterLists.release(); 5267 return Result.get(); 5268 } else { 5269 // The "template<>" header is extraneous. 5270 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 5271 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 5272 isExplicitSpecialization = true; 5273 } 5274 } 5275 } 5276 5277 DeclContext *SearchDC = CurContext; 5278 DeclContext *DC = CurContext; 5279 bool isStdBadAlloc = false; 5280 5281 RedeclarationKind Redecl = ForRedeclaration; 5282 if (TUK == TUK_Friend || TUK == TUK_Reference) 5283 Redecl = NotForRedeclaration; 5284 5285 LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl); 5286 5287 if (Name && SS.isNotEmpty()) { 5288 // We have a nested-name tag ('struct foo::bar'). 5289 5290 // Check for invalid 'foo::'. 5291 if (SS.isInvalid()) { 5292 Name = 0; 5293 goto CreateNewDecl; 5294 } 5295 5296 // If this is a friend or a reference to a class in a dependent 5297 // context, don't try to make a decl for it. 5298 if (TUK == TUK_Friend || TUK == TUK_Reference) { 5299 DC = computeDeclContext(SS, false); 5300 if (!DC) { 5301 IsDependent = true; 5302 return DeclPtrTy(); 5303 } 5304 } else { 5305 DC = computeDeclContext(SS, true); 5306 if (!DC) { 5307 Diag(SS.getRange().getBegin(), diag::err_dependent_nested_name_spec) 5308 << SS.getRange(); 5309 return DeclPtrTy(); 5310 } 5311 } 5312 5313 if (RequireCompleteDeclContext(SS, DC)) 5314 return DeclPtrTy::make((Decl *)0); 5315 5316 SearchDC = DC; 5317 // Look-up name inside 'foo::'. 5318 LookupQualifiedName(Previous, DC); 5319 5320 if (Previous.isAmbiguous()) 5321 return DeclPtrTy(); 5322 5323 if (Previous.empty()) { 5324 // Name lookup did not find anything. However, if the 5325 // nested-name-specifier refers to the current instantiation, 5326 // and that current instantiation has any dependent base 5327 // classes, we might find something at instantiation time: treat 5328 // this as a dependent elaborated-type-specifier. 5329 if (Previous.wasNotFoundInCurrentInstantiation()) { 5330 IsDependent = true; 5331 return DeclPtrTy(); 5332 } 5333 5334 // A tag 'foo::bar' must already exist. 5335 Diag(NameLoc, diag::err_not_tag_in_scope) 5336 << Kind << Name << DC << SS.getRange(); 5337 Name = 0; 5338 Invalid = true; 5339 goto CreateNewDecl; 5340 } 5341 } else if (Name) { 5342 // If this is a named struct, check to see if there was a previous forward 5343 // declaration or definition. 5344 // FIXME: We're looking into outer scopes here, even when we 5345 // shouldn't be. Doing so can result in ambiguities that we 5346 // shouldn't be diagnosing. 5347 LookupName(Previous, S); 5348 5349 // Note: there used to be some attempt at recovery here. 5350 if (Previous.isAmbiguous()) 5351 return DeclPtrTy(); 5352 5353 if (!getLangOptions().CPlusPlus && TUK != TUK_Reference) { 5354 // FIXME: This makes sure that we ignore the contexts associated 5355 // with C structs, unions, and enums when looking for a matching 5356 // tag declaration or definition. See the similar lookup tweak 5357 // in Sema::LookupName; is there a better way to deal with this? 5358 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 5359 SearchDC = SearchDC->getParent(); 5360 } 5361 } 5362 5363 if (Previous.isSingleResult() && 5364 Previous.getFoundDecl()->isTemplateParameter()) { 5365 // Maybe we will complain about the shadowed template parameter. 5366 DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl()); 5367 // Just pretend that we didn't see the previous declaration. 5368 Previous.clear(); 5369 } 5370 5371 if (getLangOptions().CPlusPlus && Name && DC && StdNamespace && 5372 DC->Equals(getStdNamespace()) && Name->isStr("bad_alloc")) { 5373 // This is a declaration of or a reference to "std::bad_alloc". 5374 isStdBadAlloc = true; 5375 5376 if (Previous.empty() && StdBadAlloc) { 5377 // std::bad_alloc has been implicitly declared (but made invisible to 5378 // name lookup). Fill in this implicit declaration as the previous 5379 // declaration, so that the declarations get chained appropriately. 5380 Previous.addDecl(getStdBadAlloc()); 5381 } 5382 } 5383 5384 // If we didn't find a previous declaration, and this is a reference 5385 // (or friend reference), move to the correct scope. In C++, we 5386 // also need to do a redeclaration lookup there, just in case 5387 // there's a shadow friend decl. 5388 if (Name && Previous.empty() && 5389 (TUK == TUK_Reference || TUK == TUK_Friend)) { 5390 if (Invalid) goto CreateNewDecl; 5391 assert(SS.isEmpty()); 5392 5393 if (TUK == TUK_Reference) { 5394 // C++ [basic.scope.pdecl]p5: 5395 // -- for an elaborated-type-specifier of the form 5396 // 5397 // class-key identifier 5398 // 5399 // if the elaborated-type-specifier is used in the 5400 // decl-specifier-seq or parameter-declaration-clause of a 5401 // function defined in namespace scope, the identifier is 5402 // declared as a class-name in the namespace that contains 5403 // the declaration; otherwise, except as a friend 5404 // declaration, the identifier is declared in the smallest 5405 // non-class, non-function-prototype scope that contains the 5406 // declaration. 5407 // 5408 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 5409 // C structs and unions. 5410 // 5411 // It is an error in C++ to declare (rather than define) an enum 5412 // type, including via an elaborated type specifier. We'll 5413 // diagnose that later; for now, declare the enum in the same 5414 // scope as we would have picked for any other tag type. 5415 // 5416 // GNU C also supports this behavior as part of its incomplete 5417 // enum types extension, while GNU C++ does not. 5418 // 5419 // Find the context where we'll be declaring the tag. 5420 // FIXME: We would like to maintain the current DeclContext as the 5421 // lexical context, 5422 while (SearchDC->isRecord()) 5423 SearchDC = SearchDC->getParent(); 5424 5425 // Find the scope where we'll be declaring the tag. 5426 while (S->isClassScope() || 5427 (getLangOptions().CPlusPlus && 5428 S->isFunctionPrototypeScope()) || 5429 ((S->getFlags() & Scope::DeclScope) == 0) || 5430 (S->getEntity() && 5431 ((DeclContext *)S->getEntity())->isTransparentContext())) 5432 S = S->getParent(); 5433 } else { 5434 assert(TUK == TUK_Friend); 5435 // C++ [namespace.memdef]p3: 5436 // If a friend declaration in a non-local class first declares a 5437 // class or function, the friend class or function is a member of 5438 // the innermost enclosing namespace. 5439 SearchDC = SearchDC->getEnclosingNamespaceContext(); 5440 } 5441 5442 // In C++, we need to do a redeclaration lookup to properly 5443 // diagnose some problems. 5444 if (getLangOptions().CPlusPlus) { 5445 Previous.setRedeclarationKind(ForRedeclaration); 5446 LookupQualifiedName(Previous, SearchDC); 5447 } 5448 } 5449 5450 if (!Previous.empty()) { 5451 NamedDecl *PrevDecl = (*Previous.begin())->getUnderlyingDecl(); 5452 5453 // It's okay to have a tag decl in the same scope as a typedef 5454 // which hides a tag decl in the same scope. Finding this 5455 // insanity with a redeclaration lookup can only actually happen 5456 // in C++. 5457 // 5458 // This is also okay for elaborated-type-specifiers, which is 5459 // technically forbidden by the current standard but which is 5460 // okay according to the likely resolution of an open issue; 5461 // see http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#407 5462 if (getLangOptions().CPlusPlus) { 5463 if (TypedefDecl *TD = dyn_cast<TypedefDecl>(PrevDecl)) { 5464 if (const TagType *TT = TD->getUnderlyingType()->getAs<TagType>()) { 5465 TagDecl *Tag = TT->getDecl(); 5466 if (Tag->getDeclName() == Name && 5467 Tag->getDeclContext()->getLookupContext() 5468 ->Equals(TD->getDeclContext()->getLookupContext())) { 5469 PrevDecl = Tag; 5470 Previous.clear(); 5471 Previous.addDecl(Tag); 5472 } 5473 } 5474 } 5475 } 5476 5477 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 5478 // If this is a use of a previous tag, or if the tag is already declared 5479 // in the same scope (so that the definition/declaration completes or 5480 // rementions the tag), reuse the decl. 5481 if (TUK == TUK_Reference || TUK == TUK_Friend || 5482 isDeclInScope(PrevDecl, SearchDC, S)) { 5483 // Make sure that this wasn't declared as an enum and now used as a 5484 // struct or something similar. 5485 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, KWLoc, *Name)) { 5486 bool SafeToContinue 5487 = (PrevTagDecl->getTagKind() != TTK_Enum && 5488 Kind != TTK_Enum); 5489 if (SafeToContinue) 5490 Diag(KWLoc, diag::err_use_with_wrong_tag) 5491 << Name 5492 << FixItHint::CreateReplacement(SourceRange(KWLoc), 5493 PrevTagDecl->getKindName()); 5494 else 5495 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 5496 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 5497 5498 if (SafeToContinue) 5499 Kind = PrevTagDecl->getTagKind(); 5500 else { 5501 // Recover by making this an anonymous redefinition. 5502 Name = 0; 5503 Previous.clear(); 5504 Invalid = true; 5505 } 5506 } 5507 5508 if (!Invalid) { 5509 // If this is a use, just return the declaration we found. 5510 5511 // FIXME: In the future, return a variant or some other clue 5512 // for the consumer of this Decl to know it doesn't own it. 5513 // For our current ASTs this shouldn't be a problem, but will 5514 // need to be changed with DeclGroups. 5515 if ((TUK == TUK_Reference && !PrevTagDecl->getFriendObjectKind()) || 5516 TUK == TUK_Friend) 5517 return DeclPtrTy::make(PrevTagDecl); 5518 5519 // Diagnose attempts to redefine a tag. 5520 if (TUK == TUK_Definition) { 5521 if (TagDecl *Def = PrevTagDecl->getDefinition()) { 5522 // If we're defining a specialization and the previous definition 5523 // is from an implicit instantiation, don't emit an error 5524 // here; we'll catch this in the general case below. 5525 if (!isExplicitSpecialization || 5526 !isa<CXXRecordDecl>(Def) || 5527 cast<CXXRecordDecl>(Def)->getTemplateSpecializationKind() 5528 == TSK_ExplicitSpecialization) { 5529 Diag(NameLoc, diag::err_redefinition) << Name; 5530 Diag(Def->getLocation(), diag::note_previous_definition); 5531 // If this is a redefinition, recover by making this 5532 // struct be anonymous, which will make any later 5533 // references get the previous definition. 5534 Name = 0; 5535 Previous.clear(); 5536 Invalid = true; 5537 } 5538 } else { 5539 // If the type is currently being defined, complain 5540 // about a nested redefinition. 5541 TagType *Tag = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 5542 if (Tag->isBeingDefined()) { 5543 Diag(NameLoc, diag::err_nested_redefinition) << Name; 5544 Diag(PrevTagDecl->getLocation(), 5545 diag::note_previous_definition); 5546 Name = 0; 5547 Previous.clear(); 5548 Invalid = true; 5549 } 5550 } 5551 5552 // Okay, this is definition of a previously declared or referenced 5553 // tag PrevDecl. We're going to create a new Decl for it. 5554 } 5555 } 5556 // If we get here we have (another) forward declaration or we 5557 // have a definition. Just create a new decl. 5558 5559 } else { 5560 // If we get here, this is a definition of a new tag type in a nested 5561 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 5562 // new decl/type. We set PrevDecl to NULL so that the entities 5563 // have distinct types. 5564 Previous.clear(); 5565 } 5566 // If we get here, we're going to create a new Decl. If PrevDecl 5567 // is non-NULL, it's a definition of the tag declared by 5568 // PrevDecl. If it's NULL, we have a new definition. 5569 5570 5571 // Otherwise, PrevDecl is not a tag, but was found with tag 5572 // lookup. This is only actually possible in C++, where a few 5573 // things like templates still live in the tag namespace. 5574 } else { 5575 assert(getLangOptions().CPlusPlus); 5576 5577 // Use a better diagnostic if an elaborated-type-specifier 5578 // found the wrong kind of type on the first 5579 // (non-redeclaration) lookup. 5580 if ((TUK == TUK_Reference || TUK == TUK_Friend) && 5581 !Previous.isForRedeclaration()) { 5582 unsigned Kind = 0; 5583 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 5584 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 2; 5585 Diag(NameLoc, diag::err_tag_reference_non_tag) << Kind; 5586 Diag(PrevDecl->getLocation(), diag::note_declared_at); 5587 Invalid = true; 5588 5589 // Otherwise, only diagnose if the declaration is in scope. 5590 } else if (!isDeclInScope(PrevDecl, SearchDC, S)) { 5591 // do nothing 5592 5593 // Diagnose implicit declarations introduced by elaborated types. 5594 } else if (TUK == TUK_Reference || TUK == TUK_Friend) { 5595 unsigned Kind = 0; 5596 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 5597 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 2; 5598 Diag(NameLoc, diag::err_tag_reference_conflict) << Kind; 5599 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 5600 Invalid = true; 5601 5602 // Otherwise it's a declaration. Call out a particularly common 5603 // case here. 5604 } else if (isa<TypedefDecl>(PrevDecl)) { 5605 Diag(NameLoc, diag::err_tag_definition_of_typedef) 5606 << Name 5607 << cast<TypedefDecl>(PrevDecl)->getUnderlyingType(); 5608 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 5609 Invalid = true; 5610 5611 // Otherwise, diagnose. 5612 } else { 5613 // The tag name clashes with something else in the target scope, 5614 // issue an error and recover by making this tag be anonymous. 5615 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 5616 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 5617 Name = 0; 5618 Invalid = true; 5619 } 5620 5621 // The existing declaration isn't relevant to us; we're in a 5622 // new scope, so clear out the previous declaration. 5623 Previous.clear(); 5624 } 5625 } 5626 5627CreateNewDecl: 5628 5629 TagDecl *PrevDecl = 0; 5630 if (Previous.isSingleResult()) 5631 PrevDecl = cast<TagDecl>(Previous.getFoundDecl()); 5632 5633 // If there is an identifier, use the location of the identifier as the 5634 // location of the decl, otherwise use the location of the struct/union 5635 // keyword. 5636 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 5637 5638 // Otherwise, create a new declaration. If there is a previous 5639 // declaration of the same entity, the two will be linked via 5640 // PrevDecl. 5641 TagDecl *New; 5642 5643 if (Kind == TTK_Enum) { 5644 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 5645 // enum X { A, B, C } D; D should chain to X. 5646 New = EnumDecl::Create(Context, SearchDC, Loc, Name, KWLoc, 5647 cast_or_null<EnumDecl>(PrevDecl)); 5648 // If this is an undefined enum, warn. 5649 if (TUK != TUK_Definition && !Invalid) { 5650 TagDecl *Def; 5651 if (PrevDecl && (Def = cast<EnumDecl>(PrevDecl)->getDefinition())) { 5652 Diag(Loc, diag::ext_forward_ref_enum_def) 5653 << New; 5654 Diag(Def->getLocation(), diag::note_previous_definition); 5655 } else { 5656 Diag(Loc, 5657 getLangOptions().CPlusPlus? diag::err_forward_ref_enum 5658 : diag::ext_forward_ref_enum); 5659 } 5660 } 5661 } else { 5662 // struct/union/class 5663 5664 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 5665 // struct X { int A; } D; D should chain to X. 5666 if (getLangOptions().CPlusPlus) { 5667 // FIXME: Look for a way to use RecordDecl for simple structs. 5668 New = CXXRecordDecl::Create(Context, Kind, SearchDC, Loc, Name, KWLoc, 5669 cast_or_null<CXXRecordDecl>(PrevDecl)); 5670 5671 if (isStdBadAlloc && (!StdBadAlloc || getStdBadAlloc()->isImplicit())) 5672 StdBadAlloc = cast<CXXRecordDecl>(New); 5673 } else 5674 New = RecordDecl::Create(Context, Kind, SearchDC, Loc, Name, KWLoc, 5675 cast_or_null<RecordDecl>(PrevDecl)); 5676 } 5677 5678 // Maybe add qualifier info. 5679 if (SS.isNotEmpty()) { 5680 if (SS.isSet()) { 5681 NestedNameSpecifier *NNS 5682 = static_cast<NestedNameSpecifier*>(SS.getScopeRep()); 5683 New->setQualifierInfo(NNS, SS.getRange()); 5684 if (NumMatchedTemplateParamLists > 0) { 5685 New->setTemplateParameterListsInfo(Context, 5686 NumMatchedTemplateParamLists, 5687 (TemplateParameterList**) TemplateParameterLists.release()); 5688 } 5689 } 5690 else 5691 Invalid = true; 5692 } 5693 5694 if (RecordDecl *RD = dyn_cast<RecordDecl>(New)) { 5695 // Add alignment attributes if necessary; these attributes are checked when 5696 // the ASTContext lays out the structure. 5697 // 5698 // It is important for implementing the correct semantics that this 5699 // happen here (in act on tag decl). The #pragma pack stack is 5700 // maintained as a result of parser callbacks which can occur at 5701 // many points during the parsing of a struct declaration (because 5702 // the #pragma tokens are effectively skipped over during the 5703 // parsing of the struct). 5704 AddAlignmentAttributesForRecord(RD); 5705 } 5706 5707 // If this is a specialization of a member class (of a class template), 5708 // check the specialization. 5709 if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous)) 5710 Invalid = true; 5711 5712 if (Invalid) 5713 New->setInvalidDecl(); 5714 5715 if (Attr) 5716 ProcessDeclAttributeList(S, New, Attr); 5717 5718 // If we're declaring or defining a tag in function prototype scope 5719 // in C, note that this type can only be used within the function. 5720 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 5721 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 5722 5723 // Set the lexical context. If the tag has a C++ scope specifier, the 5724 // lexical context will be different from the semantic context. 5725 New->setLexicalDeclContext(CurContext); 5726 5727 // Mark this as a friend decl if applicable. 5728 if (TUK == TUK_Friend) 5729 New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ !Previous.empty()); 5730 5731 // Set the access specifier. 5732 if (!Invalid && SearchDC->isRecord()) 5733 SetMemberAccessSpecifier(New, PrevDecl, AS); 5734 5735 if (TUK == TUK_Definition) 5736 New->startDefinition(); 5737 5738 // If this has an identifier, add it to the scope stack. 5739 if (TUK == TUK_Friend) { 5740 // We might be replacing an existing declaration in the lookup tables; 5741 // if so, borrow its access specifier. 5742 if (PrevDecl) 5743 New->setAccess(PrevDecl->getAccess()); 5744 5745 DeclContext *DC = New->getDeclContext()->getLookupContext(); 5746 DC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 5747 if (Name) // can be null along some error paths 5748 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 5749 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false); 5750 } else if (Name) { 5751 S = getNonFieldDeclScope(S); 5752 PushOnScopeChains(New, S); 5753 } else { 5754 CurContext->addDecl(New); 5755 } 5756 5757 // If this is the C FILE type, notify the AST context. 5758 if (IdentifierInfo *II = New->getIdentifier()) 5759 if (!New->isInvalidDecl() && 5760 New->getDeclContext()->getLookupContext()->isTranslationUnit() && 5761 II->isStr("FILE")) 5762 Context.setFILEDecl(New); 5763 5764 OwnedDecl = true; 5765 return DeclPtrTy::make(New); 5766} 5767 5768void Sema::ActOnTagStartDefinition(Scope *S, DeclPtrTy TagD) { 5769 AdjustDeclIfTemplate(TagD); 5770 TagDecl *Tag = cast<TagDecl>(TagD.getAs<Decl>()); 5771 5772 // Enter the tag context. 5773 PushDeclContext(S, Tag); 5774} 5775 5776void Sema::ActOnStartCXXMemberDeclarations(Scope *S, DeclPtrTy TagD, 5777 SourceLocation LBraceLoc) { 5778 AdjustDeclIfTemplate(TagD); 5779 CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD.getAs<Decl>()); 5780 5781 FieldCollector->StartClass(); 5782 5783 if (!Record->getIdentifier()) 5784 return; 5785 5786 // C++ [class]p2: 5787 // [...] The class-name is also inserted into the scope of the 5788 // class itself; this is known as the injected-class-name. For 5789 // purposes of access checking, the injected-class-name is treated 5790 // as if it were a public member name. 5791 CXXRecordDecl *InjectedClassName 5792 = CXXRecordDecl::Create(Context, Record->getTagKind(), 5793 CurContext, Record->getLocation(), 5794 Record->getIdentifier(), 5795 Record->getTagKeywordLoc(), 5796 Record); 5797 InjectedClassName->setImplicit(); 5798 InjectedClassName->setAccess(AS_public); 5799 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 5800 InjectedClassName->setDescribedClassTemplate(Template); 5801 PushOnScopeChains(InjectedClassName, S); 5802 assert(InjectedClassName->isInjectedClassName() && 5803 "Broken injected-class-name"); 5804} 5805 5806void Sema::ActOnTagFinishDefinition(Scope *S, DeclPtrTy TagD, 5807 SourceLocation RBraceLoc) { 5808 AdjustDeclIfTemplate(TagD); 5809 TagDecl *Tag = cast<TagDecl>(TagD.getAs<Decl>()); 5810 Tag->setRBraceLoc(RBraceLoc); 5811 5812 if (isa<CXXRecordDecl>(Tag)) 5813 FieldCollector->FinishClass(); 5814 5815 // Exit this scope of this tag's definition. 5816 PopDeclContext(); 5817 5818 // Notify the consumer that we've defined a tag. 5819 Consumer.HandleTagDeclDefinition(Tag); 5820} 5821 5822void Sema::ActOnTagDefinitionError(Scope *S, DeclPtrTy TagD) { 5823 AdjustDeclIfTemplate(TagD); 5824 TagDecl *Tag = cast<TagDecl>(TagD.getAs<Decl>()); 5825 Tag->setInvalidDecl(); 5826 5827 // We're undoing ActOnTagStartDefinition here, not 5828 // ActOnStartCXXMemberDeclarations, so we don't have to mess with 5829 // the FieldCollector. 5830 5831 PopDeclContext(); 5832} 5833 5834// Note that FieldName may be null for anonymous bitfields. 5835bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName, 5836 QualType FieldTy, const Expr *BitWidth, 5837 bool *ZeroWidth) { 5838 // Default to true; that shouldn't confuse checks for emptiness 5839 if (ZeroWidth) 5840 *ZeroWidth = true; 5841 5842 // C99 6.7.2.1p4 - verify the field type. 5843 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 5844 if (!FieldTy->isDependentType() && !FieldTy->isIntegralOrEnumerationType()) { 5845 // Handle incomplete types with specific error. 5846 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 5847 return true; 5848 if (FieldName) 5849 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 5850 << FieldName << FieldTy << BitWidth->getSourceRange(); 5851 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) 5852 << FieldTy << BitWidth->getSourceRange(); 5853 } 5854 5855 // If the bit-width is type- or value-dependent, don't try to check 5856 // it now. 5857 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 5858 return false; 5859 5860 llvm::APSInt Value; 5861 if (VerifyIntegerConstantExpression(BitWidth, &Value)) 5862 return true; 5863 5864 if (Value != 0 && ZeroWidth) 5865 *ZeroWidth = false; 5866 5867 // Zero-width bitfield is ok for anonymous field. 5868 if (Value == 0 && FieldName) 5869 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 5870 5871 if (Value.isSigned() && Value.isNegative()) { 5872 if (FieldName) 5873 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 5874 << FieldName << Value.toString(10); 5875 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) 5876 << Value.toString(10); 5877 } 5878 5879 if (!FieldTy->isDependentType()) { 5880 uint64_t TypeSize = Context.getTypeSize(FieldTy); 5881 if (Value.getZExtValue() > TypeSize) { 5882 if (!getLangOptions().CPlusPlus) { 5883 if (FieldName) 5884 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 5885 << FieldName << (unsigned)Value.getZExtValue() 5886 << (unsigned)TypeSize; 5887 5888 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) 5889 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 5890 } 5891 5892 if (FieldName) 5893 Diag(FieldLoc, diag::warn_bitfield_width_exceeds_type_size) 5894 << FieldName << (unsigned)Value.getZExtValue() 5895 << (unsigned)TypeSize; 5896 else 5897 Diag(FieldLoc, diag::warn_anon_bitfield_width_exceeds_type_size) 5898 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 5899 } 5900 } 5901 5902 return false; 5903} 5904 5905/// ActOnField - Each field of a struct/union/class is passed into this in order 5906/// to create a FieldDecl object for it. 5907Sema::DeclPtrTy Sema::ActOnField(Scope *S, DeclPtrTy TagD, 5908 SourceLocation DeclStart, 5909 Declarator &D, ExprTy *BitfieldWidth) { 5910 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD.getAs<Decl>()), 5911 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 5912 AS_public); 5913 return DeclPtrTy::make(Res); 5914} 5915 5916/// HandleField - Analyze a field of a C struct or a C++ data member. 5917/// 5918FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 5919 SourceLocation DeclStart, 5920 Declarator &D, Expr *BitWidth, 5921 AccessSpecifier AS) { 5922 IdentifierInfo *II = D.getIdentifier(); 5923 SourceLocation Loc = DeclStart; 5924 if (II) Loc = D.getIdentifierLoc(); 5925 5926 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 5927 QualType T = TInfo->getType(); 5928 if (getLangOptions().CPlusPlus) 5929 CheckExtraCXXDefaultArguments(D); 5930 5931 DiagnoseFunctionSpecifiers(D); 5932 5933 if (D.getDeclSpec().isThreadSpecified()) 5934 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 5935 5936 NamedDecl *PrevDecl = LookupSingleName(S, II, Loc, LookupMemberName, 5937 ForRedeclaration); 5938 5939 if (PrevDecl && PrevDecl->isTemplateParameter()) { 5940 // Maybe we will complain about the shadowed template parameter. 5941 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 5942 // Just pretend that we didn't see the previous declaration. 5943 PrevDecl = 0; 5944 } 5945 5946 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 5947 PrevDecl = 0; 5948 5949 bool Mutable 5950 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable); 5951 SourceLocation TSSL = D.getSourceRange().getBegin(); 5952 FieldDecl *NewFD 5953 = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, TSSL, 5954 AS, PrevDecl, &D); 5955 5956 if (NewFD->isInvalidDecl()) 5957 Record->setInvalidDecl(); 5958 5959 if (NewFD->isInvalidDecl() && PrevDecl) { 5960 // Don't introduce NewFD into scope; there's already something 5961 // with the same name in the same scope. 5962 } else if (II) { 5963 PushOnScopeChains(NewFD, S); 5964 } else 5965 Record->addDecl(NewFD); 5966 5967 return NewFD; 5968} 5969 5970/// \brief Build a new FieldDecl and check its well-formedness. 5971/// 5972/// This routine builds a new FieldDecl given the fields name, type, 5973/// record, etc. \p PrevDecl should refer to any previous declaration 5974/// with the same name and in the same scope as the field to be 5975/// created. 5976/// 5977/// \returns a new FieldDecl. 5978/// 5979/// \todo The Declarator argument is a hack. It will be removed once 5980FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 5981 TypeSourceInfo *TInfo, 5982 RecordDecl *Record, SourceLocation Loc, 5983 bool Mutable, Expr *BitWidth, 5984 SourceLocation TSSL, 5985 AccessSpecifier AS, NamedDecl *PrevDecl, 5986 Declarator *D) { 5987 IdentifierInfo *II = Name.getAsIdentifierInfo(); 5988 bool InvalidDecl = false; 5989 if (D) InvalidDecl = D->isInvalidType(); 5990 5991 // If we receive a broken type, recover by assuming 'int' and 5992 // marking this declaration as invalid. 5993 if (T.isNull()) { 5994 InvalidDecl = true; 5995 T = Context.IntTy; 5996 } 5997 5998 QualType EltTy = Context.getBaseElementType(T); 5999 if (!EltTy->isDependentType() && 6000 RequireCompleteType(Loc, EltTy, diag::err_field_incomplete)) { 6001 // Fields of incomplete type force their record to be invalid. 6002 Record->setInvalidDecl(); 6003 InvalidDecl = true; 6004 } 6005 6006 // C99 6.7.2.1p8: A member of a structure or union may have any type other 6007 // than a variably modified type. 6008 if (!InvalidDecl && T->isVariablyModifiedType()) { 6009 bool SizeIsNegative; 6010 llvm::APSInt Oversized; 6011 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 6012 SizeIsNegative, 6013 Oversized); 6014 if (!FixedTy.isNull()) { 6015 Diag(Loc, diag::warn_illegal_constant_array_size); 6016 T = FixedTy; 6017 } else { 6018 if (SizeIsNegative) 6019 Diag(Loc, diag::err_typecheck_negative_array_size); 6020 else if (Oversized.getBoolValue()) 6021 Diag(Loc, diag::err_array_too_large) 6022 << Oversized.toString(10); 6023 else 6024 Diag(Loc, diag::err_typecheck_field_variable_size); 6025 InvalidDecl = true; 6026 } 6027 } 6028 6029 // Fields can not have abstract class types 6030 if (!InvalidDecl && RequireNonAbstractType(Loc, T, 6031 diag::err_abstract_type_in_decl, 6032 AbstractFieldType)) 6033 InvalidDecl = true; 6034 6035 bool ZeroWidth = false; 6036 // If this is declared as a bit-field, check the bit-field. 6037 if (!InvalidDecl && BitWidth && 6038 VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth)) { 6039 InvalidDecl = true; 6040 DeleteExpr(BitWidth); 6041 BitWidth = 0; 6042 ZeroWidth = false; 6043 } 6044 6045 // Check that 'mutable' is consistent with the type of the declaration. 6046 if (!InvalidDecl && Mutable) { 6047 unsigned DiagID = 0; 6048 if (T->isReferenceType()) 6049 DiagID = diag::err_mutable_reference; 6050 else if (T.isConstQualified()) 6051 DiagID = diag::err_mutable_const; 6052 6053 if (DiagID) { 6054 SourceLocation ErrLoc = Loc; 6055 if (D && D->getDeclSpec().getStorageClassSpecLoc().isValid()) 6056 ErrLoc = D->getDeclSpec().getStorageClassSpecLoc(); 6057 Diag(ErrLoc, DiagID); 6058 Mutable = false; 6059 InvalidDecl = true; 6060 } 6061 } 6062 6063 FieldDecl *NewFD = FieldDecl::Create(Context, Record, Loc, II, T, TInfo, 6064 BitWidth, Mutable); 6065 if (InvalidDecl) 6066 NewFD->setInvalidDecl(); 6067 6068 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 6069 Diag(Loc, diag::err_duplicate_member) << II; 6070 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 6071 NewFD->setInvalidDecl(); 6072 } 6073 6074 if (!InvalidDecl && getLangOptions().CPlusPlus) { 6075 CXXRecordDecl* CXXRecord = cast<CXXRecordDecl>(Record); 6076 6077 if (!T->isPODType()) 6078 CXXRecord->setPOD(false); 6079 if (!ZeroWidth) 6080 CXXRecord->setEmpty(false); 6081 6082 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 6083 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 6084 if (RDecl->getDefinition()) { 6085 if (!RDecl->hasTrivialConstructor()) 6086 CXXRecord->setHasTrivialConstructor(false); 6087 if (!RDecl->hasTrivialCopyConstructor()) 6088 CXXRecord->setHasTrivialCopyConstructor(false); 6089 if (!RDecl->hasTrivialCopyAssignment()) 6090 CXXRecord->setHasTrivialCopyAssignment(false); 6091 if (!RDecl->hasTrivialDestructor()) 6092 CXXRecord->setHasTrivialDestructor(false); 6093 6094 // C++ 9.5p1: An object of a class with a non-trivial 6095 // constructor, a non-trivial copy constructor, a non-trivial 6096 // destructor, or a non-trivial copy assignment operator 6097 // cannot be a member of a union, nor can an array of such 6098 // objects. 6099 // TODO: C++0x alters this restriction significantly. 6100 if (Record->isUnion() && CheckNontrivialField(NewFD)) 6101 NewFD->setInvalidDecl(); 6102 } 6103 } 6104 } 6105 6106 // FIXME: We need to pass in the attributes given an AST 6107 // representation, not a parser representation. 6108 if (D) 6109 // FIXME: What to pass instead of TUScope? 6110 ProcessDeclAttributes(TUScope, NewFD, *D); 6111 6112 if (T.isObjCGCWeak()) 6113 Diag(Loc, diag::warn_attribute_weak_on_field); 6114 6115 NewFD->setAccess(AS); 6116 6117 // C++ [dcl.init.aggr]p1: 6118 // An aggregate is an array or a class (clause 9) with [...] no 6119 // private or protected non-static data members (clause 11). 6120 // A POD must be an aggregate. 6121 if (getLangOptions().CPlusPlus && 6122 (AS == AS_private || AS == AS_protected)) { 6123 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record); 6124 CXXRecord->setAggregate(false); 6125 CXXRecord->setPOD(false); 6126 } 6127 6128 return NewFD; 6129} 6130 6131bool Sema::CheckNontrivialField(FieldDecl *FD) { 6132 assert(FD); 6133 assert(getLangOptions().CPlusPlus && "valid check only for C++"); 6134 6135 if (FD->isInvalidDecl()) 6136 return true; 6137 6138 QualType EltTy = Context.getBaseElementType(FD->getType()); 6139 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 6140 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 6141 if (RDecl->getDefinition()) { 6142 // We check for copy constructors before constructors 6143 // because otherwise we'll never get complaints about 6144 // copy constructors. 6145 6146 CXXSpecialMember member = CXXInvalid; 6147 if (!RDecl->hasTrivialCopyConstructor()) 6148 member = CXXCopyConstructor; 6149 else if (!RDecl->hasTrivialConstructor()) 6150 member = CXXConstructor; 6151 else if (!RDecl->hasTrivialCopyAssignment()) 6152 member = CXXCopyAssignment; 6153 else if (!RDecl->hasTrivialDestructor()) 6154 member = CXXDestructor; 6155 6156 if (member != CXXInvalid) { 6157 Diag(FD->getLocation(), diag::err_illegal_union_or_anon_struct_member) 6158 << (int)FD->getParent()->isUnion() << FD->getDeclName() << member; 6159 DiagnoseNontrivial(RT, member); 6160 return true; 6161 } 6162 } 6163 } 6164 6165 return false; 6166} 6167 6168/// DiagnoseNontrivial - Given that a class has a non-trivial 6169/// special member, figure out why. 6170void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) { 6171 QualType QT(T, 0U); 6172 CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl()); 6173 6174 // Check whether the member was user-declared. 6175 switch (member) { 6176 case CXXInvalid: 6177 break; 6178 6179 case CXXConstructor: 6180 if (RD->hasUserDeclaredConstructor()) { 6181 typedef CXXRecordDecl::ctor_iterator ctor_iter; 6182 for (ctor_iter ci = RD->ctor_begin(), ce = RD->ctor_end(); ci != ce;++ci){ 6183 const FunctionDecl *body = 0; 6184 ci->hasBody(body); 6185 if (!body || !cast<CXXConstructorDecl>(body)->isImplicitlyDefined()) { 6186 SourceLocation CtorLoc = ci->getLocation(); 6187 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 6188 return; 6189 } 6190 } 6191 6192 assert(0 && "found no user-declared constructors"); 6193 return; 6194 } 6195 break; 6196 6197 case CXXCopyConstructor: 6198 if (RD->hasUserDeclaredCopyConstructor()) { 6199 SourceLocation CtorLoc = 6200 RD->getCopyConstructor(Context, 0)->getLocation(); 6201 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 6202 return; 6203 } 6204 break; 6205 6206 case CXXCopyAssignment: 6207 if (RD->hasUserDeclaredCopyAssignment()) { 6208 // FIXME: this should use the location of the copy 6209 // assignment, not the type. 6210 SourceLocation TyLoc = RD->getSourceRange().getBegin(); 6211 Diag(TyLoc, diag::note_nontrivial_user_defined) << QT << member; 6212 return; 6213 } 6214 break; 6215 6216 case CXXDestructor: 6217 if (RD->hasUserDeclaredDestructor()) { 6218 SourceLocation DtorLoc = LookupDestructor(RD)->getLocation(); 6219 Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member; 6220 return; 6221 } 6222 break; 6223 } 6224 6225 typedef CXXRecordDecl::base_class_iterator base_iter; 6226 6227 // Virtual bases and members inhibit trivial copying/construction, 6228 // but not trivial destruction. 6229 if (member != CXXDestructor) { 6230 // Check for virtual bases. vbases includes indirect virtual bases, 6231 // so we just iterate through the direct bases. 6232 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) 6233 if (bi->isVirtual()) { 6234 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 6235 Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1; 6236 return; 6237 } 6238 6239 // Check for virtual methods. 6240 typedef CXXRecordDecl::method_iterator meth_iter; 6241 for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me; 6242 ++mi) { 6243 if (mi->isVirtual()) { 6244 SourceLocation MLoc = mi->getSourceRange().getBegin(); 6245 Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0; 6246 return; 6247 } 6248 } 6249 } 6250 6251 bool (CXXRecordDecl::*hasTrivial)() const; 6252 switch (member) { 6253 case CXXConstructor: 6254 hasTrivial = &CXXRecordDecl::hasTrivialConstructor; break; 6255 case CXXCopyConstructor: 6256 hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break; 6257 case CXXCopyAssignment: 6258 hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break; 6259 case CXXDestructor: 6260 hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break; 6261 default: 6262 assert(0 && "unexpected special member"); return; 6263 } 6264 6265 // Check for nontrivial bases (and recurse). 6266 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) { 6267 const RecordType *BaseRT = bi->getType()->getAs<RecordType>(); 6268 assert(BaseRT && "Don't know how to handle dependent bases"); 6269 CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl()); 6270 if (!(BaseRecTy->*hasTrivial)()) { 6271 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 6272 Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member; 6273 DiagnoseNontrivial(BaseRT, member); 6274 return; 6275 } 6276 } 6277 6278 // Check for nontrivial members (and recurse). 6279 typedef RecordDecl::field_iterator field_iter; 6280 for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe; 6281 ++fi) { 6282 QualType EltTy = Context.getBaseElementType((*fi)->getType()); 6283 if (const RecordType *EltRT = EltTy->getAs<RecordType>()) { 6284 CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl()); 6285 6286 if (!(EltRD->*hasTrivial)()) { 6287 SourceLocation FLoc = (*fi)->getLocation(); 6288 Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member; 6289 DiagnoseNontrivial(EltRT, member); 6290 return; 6291 } 6292 } 6293 } 6294 6295 assert(0 && "found no explanation for non-trivial member"); 6296} 6297 6298/// TranslateIvarVisibility - Translate visibility from a token ID to an 6299/// AST enum value. 6300static ObjCIvarDecl::AccessControl 6301TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 6302 switch (ivarVisibility) { 6303 default: assert(0 && "Unknown visitibility kind"); 6304 case tok::objc_private: return ObjCIvarDecl::Private; 6305 case tok::objc_public: return ObjCIvarDecl::Public; 6306 case tok::objc_protected: return ObjCIvarDecl::Protected; 6307 case tok::objc_package: return ObjCIvarDecl::Package; 6308 } 6309} 6310 6311/// ActOnIvar - Each ivar field of an objective-c class is passed into this 6312/// in order to create an IvarDecl object for it. 6313Sema::DeclPtrTy Sema::ActOnIvar(Scope *S, 6314 SourceLocation DeclStart, 6315 DeclPtrTy IntfDecl, 6316 Declarator &D, ExprTy *BitfieldWidth, 6317 tok::ObjCKeywordKind Visibility) { 6318 6319 IdentifierInfo *II = D.getIdentifier(); 6320 Expr *BitWidth = (Expr*)BitfieldWidth; 6321 SourceLocation Loc = DeclStart; 6322 if (II) Loc = D.getIdentifierLoc(); 6323 6324 // FIXME: Unnamed fields can be handled in various different ways, for 6325 // example, unnamed unions inject all members into the struct namespace! 6326 6327 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6328 QualType T = TInfo->getType(); 6329 6330 if (BitWidth) { 6331 // 6.7.2.1p3, 6.7.2.1p4 6332 if (VerifyBitField(Loc, II, T, BitWidth)) { 6333 D.setInvalidType(); 6334 DeleteExpr(BitWidth); 6335 BitWidth = 0; 6336 } 6337 } else { 6338 // Not a bitfield. 6339 6340 // validate II. 6341 6342 } 6343 if (T->isReferenceType()) { 6344 Diag(Loc, diag::err_ivar_reference_type); 6345 D.setInvalidType(); 6346 } 6347 // C99 6.7.2.1p8: A member of a structure or union may have any type other 6348 // than a variably modified type. 6349 else if (T->isVariablyModifiedType()) { 6350 Diag(Loc, diag::err_typecheck_ivar_variable_size); 6351 D.setInvalidType(); 6352 } 6353 6354 // Get the visibility (access control) for this ivar. 6355 ObjCIvarDecl::AccessControl ac = 6356 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 6357 : ObjCIvarDecl::None; 6358 // Must set ivar's DeclContext to its enclosing interface. 6359 ObjCContainerDecl *EnclosingDecl = IntfDecl.getAs<ObjCContainerDecl>(); 6360 ObjCContainerDecl *EnclosingContext; 6361 if (ObjCImplementationDecl *IMPDecl = 6362 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 6363 // Case of ivar declared in an implementation. Context is that of its class. 6364 EnclosingContext = IMPDecl->getClassInterface(); 6365 assert(EnclosingContext && "Implementation has no class interface!"); 6366 } else { 6367 if (ObjCCategoryDecl *CDecl = 6368 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 6369 if (!LangOpts.ObjCNonFragileABI2 || !CDecl->IsClassExtension()) { 6370 Diag(Loc, diag::err_misplaced_ivar) << CDecl->IsClassExtension(); 6371 return DeclPtrTy(); 6372 } 6373 } 6374 EnclosingContext = EnclosingDecl; 6375 } 6376 6377 // Construct the decl. 6378 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, 6379 EnclosingContext, Loc, II, T, 6380 TInfo, ac, (Expr *)BitfieldWidth); 6381 6382 if (II) { 6383 NamedDecl *PrevDecl = LookupSingleName(S, II, Loc, LookupMemberName, 6384 ForRedeclaration); 6385 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S) 6386 && !isa<TagDecl>(PrevDecl)) { 6387 Diag(Loc, diag::err_duplicate_member) << II; 6388 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 6389 NewID->setInvalidDecl(); 6390 } 6391 } 6392 6393 // Process attributes attached to the ivar. 6394 ProcessDeclAttributes(S, NewID, D); 6395 6396 if (D.isInvalidType()) 6397 NewID->setInvalidDecl(); 6398 6399 if (II) { 6400 // FIXME: When interfaces are DeclContexts, we'll need to add 6401 // these to the interface. 6402 S->AddDecl(DeclPtrTy::make(NewID)); 6403 IdResolver.AddDecl(NewID); 6404 } 6405 6406 return DeclPtrTy::make(NewID); 6407} 6408 6409void Sema::ActOnFields(Scope* S, 6410 SourceLocation RecLoc, DeclPtrTy RecDecl, 6411 DeclPtrTy *Fields, unsigned NumFields, 6412 SourceLocation LBrac, SourceLocation RBrac, 6413 AttributeList *Attr) { 6414 Decl *EnclosingDecl = RecDecl.getAs<Decl>(); 6415 assert(EnclosingDecl && "missing record or interface decl"); 6416 6417 // If the decl this is being inserted into is invalid, then it may be a 6418 // redeclaration or some other bogus case. Don't try to add fields to it. 6419 if (EnclosingDecl->isInvalidDecl()) { 6420 // FIXME: Deallocate fields? 6421 return; 6422 } 6423 6424 6425 // Verify that all the fields are okay. 6426 unsigned NumNamedMembers = 0; 6427 llvm::SmallVector<FieldDecl*, 32> RecFields; 6428 6429 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 6430 for (unsigned i = 0; i != NumFields; ++i) { 6431 FieldDecl *FD = cast<FieldDecl>(Fields[i].getAs<Decl>()); 6432 6433 // Get the type for the field. 6434 Type *FDTy = FD->getType().getTypePtr(); 6435 6436 if (!FD->isAnonymousStructOrUnion()) { 6437 // Remember all fields written by the user. 6438 RecFields.push_back(FD); 6439 } 6440 6441 // If the field is already invalid for some reason, don't emit more 6442 // diagnostics about it. 6443 if (FD->isInvalidDecl()) { 6444 EnclosingDecl->setInvalidDecl(); 6445 continue; 6446 } 6447 6448 // C99 6.7.2.1p2: 6449 // A structure or union shall not contain a member with 6450 // incomplete or function type (hence, a structure shall not 6451 // contain an instance of itself, but may contain a pointer to 6452 // an instance of itself), except that the last member of a 6453 // structure with more than one named member may have incomplete 6454 // array type; such a structure (and any union containing, 6455 // possibly recursively, a member that is such a structure) 6456 // shall not be a member of a structure or an element of an 6457 // array. 6458 if (FDTy->isFunctionType()) { 6459 // Field declared as a function. 6460 Diag(FD->getLocation(), diag::err_field_declared_as_function) 6461 << FD->getDeclName(); 6462 FD->setInvalidDecl(); 6463 EnclosingDecl->setInvalidDecl(); 6464 continue; 6465 } else if (FDTy->isIncompleteArrayType() && i == NumFields - 1 && 6466 Record && Record->isStruct()) { 6467 // Flexible array member. 6468 if (NumNamedMembers < 1) { 6469 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 6470 << FD->getDeclName(); 6471 FD->setInvalidDecl(); 6472 EnclosingDecl->setInvalidDecl(); 6473 continue; 6474 } 6475 if (!FD->getType()->isDependentType() && 6476 !Context.getBaseElementType(FD->getType())->isPODType()) { 6477 Diag(FD->getLocation(), diag::err_flexible_array_has_nonpod_type) 6478 << FD->getDeclName() << FD->getType(); 6479 FD->setInvalidDecl(); 6480 EnclosingDecl->setInvalidDecl(); 6481 continue; 6482 } 6483 6484 // Okay, we have a legal flexible array member at the end of the struct. 6485 if (Record) 6486 Record->setHasFlexibleArrayMember(true); 6487 } else if (!FDTy->isDependentType() && 6488 RequireCompleteType(FD->getLocation(), FD->getType(), 6489 diag::err_field_incomplete)) { 6490 // Incomplete type 6491 FD->setInvalidDecl(); 6492 EnclosingDecl->setInvalidDecl(); 6493 continue; 6494 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) { 6495 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 6496 // If this is a member of a union, then entire union becomes "flexible". 6497 if (Record && Record->isUnion()) { 6498 Record->setHasFlexibleArrayMember(true); 6499 } else { 6500 // If this is a struct/class and this is not the last element, reject 6501 // it. Note that GCC supports variable sized arrays in the middle of 6502 // structures. 6503 if (i != NumFields-1) 6504 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 6505 << FD->getDeclName() << FD->getType(); 6506 else { 6507 // We support flexible arrays at the end of structs in 6508 // other structs as an extension. 6509 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 6510 << FD->getDeclName(); 6511 if (Record) 6512 Record->setHasFlexibleArrayMember(true); 6513 } 6514 } 6515 } 6516 if (Record && FDTTy->getDecl()->hasObjectMember()) 6517 Record->setHasObjectMember(true); 6518 } else if (FDTy->isObjCObjectType()) { 6519 /// A field cannot be an Objective-c object 6520 Diag(FD->getLocation(), diag::err_statically_allocated_object); 6521 FD->setInvalidDecl(); 6522 EnclosingDecl->setInvalidDecl(); 6523 continue; 6524 } else if (getLangOptions().ObjC1 && 6525 getLangOptions().getGCMode() != LangOptions::NonGC && 6526 Record && 6527 (FD->getType()->isObjCObjectPointerType() || 6528 FD->getType().isObjCGCStrong())) 6529 Record->setHasObjectMember(true); 6530 else if (Context.getAsArrayType(FD->getType())) { 6531 QualType BaseType = Context.getBaseElementType(FD->getType()); 6532 if (Record && BaseType->isRecordType() && 6533 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()) 6534 Record->setHasObjectMember(true); 6535 } 6536 // Keep track of the number of named members. 6537 if (FD->getIdentifier()) 6538 ++NumNamedMembers; 6539 } 6540 6541 // Okay, we successfully defined 'Record'. 6542 if (Record) { 6543 Record->completeDefinition(); 6544 } else { 6545 ObjCIvarDecl **ClsFields = 6546 reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); 6547 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 6548 ID->setLocEnd(RBrac); 6549 // Add ivar's to class's DeclContext. 6550 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 6551 ClsFields[i]->setLexicalDeclContext(ID); 6552 ID->addDecl(ClsFields[i]); 6553 } 6554 // Must enforce the rule that ivars in the base classes may not be 6555 // duplicates. 6556 if (ID->getSuperClass()) 6557 DiagnoseDuplicateIvars(ID, ID->getSuperClass()); 6558 } else if (ObjCImplementationDecl *IMPDecl = 6559 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 6560 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 6561 for (unsigned I = 0, N = RecFields.size(); I != N; ++I) 6562 // Ivar declared in @implementation never belongs to the implementation. 6563 // Only it is in implementation's lexical context. 6564 ClsFields[I]->setLexicalDeclContext(IMPDecl); 6565 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 6566 } else if (ObjCCategoryDecl *CDecl = 6567 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 6568 // case of ivars in class extension; all other cases have been 6569 // reported as errors elsewhere. 6570 // FIXME. Class extension does not have a LocEnd field. 6571 // CDecl->setLocEnd(RBrac); 6572 // Add ivar's to class extension's DeclContext. 6573 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 6574 ClsFields[i]->setLexicalDeclContext(CDecl); 6575 CDecl->addDecl(ClsFields[i]); 6576 } 6577 } 6578 } 6579 6580 if (Attr) 6581 ProcessDeclAttributeList(S, Record, Attr); 6582 6583 // If there's a #pragma GCC visibility in scope, and this isn't a subclass, 6584 // set the visibility of this record. 6585 if (Record && !Record->getDeclContext()->isRecord()) 6586 AddPushedVisibilityAttribute(Record); 6587} 6588 6589/// \brief Determine whether the given integral value is representable within 6590/// the given type T. 6591static bool isRepresentableIntegerValue(ASTContext &Context, 6592 llvm::APSInt &Value, 6593 QualType T) { 6594 assert(T->isIntegralType(Context) && "Integral type required!"); 6595 unsigned BitWidth = Context.getIntWidth(T); 6596 6597 if (Value.isUnsigned() || Value.isNonNegative()) 6598 return Value.getActiveBits() < BitWidth; 6599 6600 return Value.getMinSignedBits() <= BitWidth; 6601} 6602 6603// \brief Given an integral type, return the next larger integral type 6604// (or a NULL type of no such type exists). 6605static QualType getNextLargerIntegralType(ASTContext &Context, QualType T) { 6606 // FIXME: Int128/UInt128 support, which also needs to be introduced into 6607 // enum checking below. 6608 assert(T->isIntegralType(Context) && "Integral type required!"); 6609 const unsigned NumTypes = 4; 6610 QualType SignedIntegralTypes[NumTypes] = { 6611 Context.ShortTy, Context.IntTy, Context.LongTy, Context.LongLongTy 6612 }; 6613 QualType UnsignedIntegralTypes[NumTypes] = { 6614 Context.UnsignedShortTy, Context.UnsignedIntTy, Context.UnsignedLongTy, 6615 Context.UnsignedLongLongTy 6616 }; 6617 6618 unsigned BitWidth = Context.getTypeSize(T); 6619 QualType *Types = T->isSignedIntegerType()? SignedIntegralTypes 6620 : UnsignedIntegralTypes; 6621 for (unsigned I = 0; I != NumTypes; ++I) 6622 if (Context.getTypeSize(Types[I]) > BitWidth) 6623 return Types[I]; 6624 6625 return QualType(); 6626} 6627 6628EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 6629 EnumConstantDecl *LastEnumConst, 6630 SourceLocation IdLoc, 6631 IdentifierInfo *Id, 6632 ExprArg val) { 6633 Expr *Val = (Expr *)val.get(); 6634 6635 unsigned IntWidth = Context.Target.getIntWidth(); 6636 llvm::APSInt EnumVal(IntWidth); 6637 QualType EltTy; 6638 if (Val) { 6639 if (Enum->isDependentType() || Val->isTypeDependent()) 6640 EltTy = Context.DependentTy; 6641 else { 6642 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 6643 SourceLocation ExpLoc; 6644 if (!Val->isValueDependent() && 6645 VerifyIntegerConstantExpression(Val, &EnumVal)) { 6646 Val = 0; 6647 } else { 6648 if (!getLangOptions().CPlusPlus) { 6649 // C99 6.7.2.2p2: 6650 // The expression that defines the value of an enumeration constant 6651 // shall be an integer constant expression that has a value 6652 // representable as an int. 6653 6654 // Complain if the value is not representable in an int. 6655 if (!isRepresentableIntegerValue(Context, EnumVal, Context.IntTy)) 6656 Diag(IdLoc, diag::ext_enum_value_not_int) 6657 << EnumVal.toString(10) << Val->getSourceRange() 6658 << (EnumVal.isUnsigned() || EnumVal.isNonNegative()); 6659 else if (!Context.hasSameType(Val->getType(), Context.IntTy)) { 6660 // Force the type of the expression to 'int'. 6661 ImpCastExprToType(Val, Context.IntTy, CastExpr::CK_IntegralCast); 6662 6663 if (Val != val.get()) { 6664 val.release(); 6665 val = Val; 6666 } 6667 } 6668 } 6669 6670 // C++0x [dcl.enum]p5: 6671 // If the underlying type is not fixed, the type of each enumerator 6672 // is the type of its initializing value: 6673 // - If an initializer is specified for an enumerator, the 6674 // initializing value has the same type as the expression. 6675 EltTy = Val->getType(); 6676 } 6677 } 6678 } 6679 6680 if (!Val) { 6681 if (Enum->isDependentType()) 6682 EltTy = Context.DependentTy; 6683 else if (!LastEnumConst) { 6684 // C++0x [dcl.enum]p5: 6685 // If the underlying type is not fixed, the type of each enumerator 6686 // is the type of its initializing value: 6687 // - If no initializer is specified for the first enumerator, the 6688 // initializing value has an unspecified integral type. 6689 // 6690 // GCC uses 'int' for its unspecified integral type, as does 6691 // C99 6.7.2.2p3. 6692 EltTy = Context.IntTy; 6693 } else { 6694 // Assign the last value + 1. 6695 EnumVal = LastEnumConst->getInitVal(); 6696 ++EnumVal; 6697 EltTy = LastEnumConst->getType(); 6698 6699 // Check for overflow on increment. 6700 if (EnumVal < LastEnumConst->getInitVal()) { 6701 // C++0x [dcl.enum]p5: 6702 // If the underlying type is not fixed, the type of each enumerator 6703 // is the type of its initializing value: 6704 // 6705 // - Otherwise the type of the initializing value is the same as 6706 // the type of the initializing value of the preceding enumerator 6707 // unless the incremented value is not representable in that type, 6708 // in which case the type is an unspecified integral type 6709 // sufficient to contain the incremented value. If no such type 6710 // exists, the program is ill-formed. 6711 QualType T = getNextLargerIntegralType(Context, EltTy); 6712 if (T.isNull()) { 6713 // There is no integral type larger enough to represent this 6714 // value. Complain, then allow the value to wrap around. 6715 EnumVal = LastEnumConst->getInitVal(); 6716 EnumVal.zext(EnumVal.getBitWidth() * 2); 6717 Diag(IdLoc, diag::warn_enumerator_too_large) 6718 << EnumVal.toString(10); 6719 } else { 6720 EltTy = T; 6721 } 6722 6723 // Retrieve the last enumerator's value, extent that type to the 6724 // type that is supposed to be large enough to represent the incremented 6725 // value, then increment. 6726 EnumVal = LastEnumConst->getInitVal(); 6727 EnumVal.setIsSigned(EltTy->isSignedIntegerType()); 6728 EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 6729 ++EnumVal; 6730 6731 // If we're not in C++, diagnose the overflow of enumerator values, 6732 // which in C99 means that the enumerator value is not representable in 6733 // an int (C99 6.7.2.2p2). However, we support GCC's extension that 6734 // permits enumerator values that are representable in some larger 6735 // integral type. 6736 if (!getLangOptions().CPlusPlus && !T.isNull()) 6737 Diag(IdLoc, diag::warn_enum_value_overflow); 6738 } else if (!getLangOptions().CPlusPlus && 6739 !isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 6740 // Enforce C99 6.7.2.2p2 even when we compute the next value. 6741 Diag(IdLoc, diag::ext_enum_value_not_int) 6742 << EnumVal.toString(10) << 1; 6743 } 6744 } 6745 } 6746 6747 if (!EltTy->isDependentType()) { 6748 // Make the enumerator value match the signedness and size of the 6749 // enumerator's type. 6750 EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 6751 EnumVal.setIsSigned(EltTy->isSignedIntegerType()); 6752 } 6753 6754 val.release(); 6755 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 6756 Val, EnumVal); 6757} 6758 6759 6760Sema::DeclPtrTy Sema::ActOnEnumConstant(Scope *S, DeclPtrTy theEnumDecl, 6761 DeclPtrTy lastEnumConst, 6762 SourceLocation IdLoc, 6763 IdentifierInfo *Id, 6764 SourceLocation EqualLoc, ExprTy *val) { 6765 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl.getAs<Decl>()); 6766 EnumConstantDecl *LastEnumConst = 6767 cast_or_null<EnumConstantDecl>(lastEnumConst.getAs<Decl>()); 6768 Expr *Val = static_cast<Expr*>(val); 6769 6770 // The scope passed in may not be a decl scope. Zip up the scope tree until 6771 // we find one that is. 6772 S = getNonFieldDeclScope(S); 6773 6774 // Verify that there isn't already something declared with this name in this 6775 // scope. 6776 NamedDecl *PrevDecl = LookupSingleName(S, Id, IdLoc, LookupOrdinaryName, 6777 ForRedeclaration); 6778 if (PrevDecl && PrevDecl->isTemplateParameter()) { 6779 // Maybe we will complain about the shadowed template parameter. 6780 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 6781 // Just pretend that we didn't see the previous declaration. 6782 PrevDecl = 0; 6783 } 6784 6785 if (PrevDecl) { 6786 // When in C++, we may get a TagDecl with the same name; in this case the 6787 // enum constant will 'hide' the tag. 6788 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 6789 "Received TagDecl when not in C++!"); 6790 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 6791 if (isa<EnumConstantDecl>(PrevDecl)) 6792 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 6793 else 6794 Diag(IdLoc, diag::err_redefinition) << Id; 6795 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 6796 return DeclPtrTy(); 6797 } 6798 } 6799 6800 EnumConstantDecl *New = CheckEnumConstant(TheEnumDecl, LastEnumConst, 6801 IdLoc, Id, Owned(Val)); 6802 6803 // Register this decl in the current scope stack. 6804 if (New) { 6805 New->setAccess(TheEnumDecl->getAccess()); 6806 PushOnScopeChains(New, S); 6807 } 6808 6809 return DeclPtrTy::make(New); 6810} 6811 6812void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc, 6813 SourceLocation RBraceLoc, DeclPtrTy EnumDeclX, 6814 DeclPtrTy *Elements, unsigned NumElements, 6815 Scope *S, AttributeList *Attr) { 6816 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX.getAs<Decl>()); 6817 QualType EnumType = Context.getTypeDeclType(Enum); 6818 6819 if (Attr) 6820 ProcessDeclAttributeList(S, Enum, Attr); 6821 6822 if (Enum->isDependentType()) { 6823 for (unsigned i = 0; i != NumElements; ++i) { 6824 EnumConstantDecl *ECD = 6825 cast_or_null<EnumConstantDecl>(Elements[i].getAs<Decl>()); 6826 if (!ECD) continue; 6827 6828 ECD->setType(EnumType); 6829 } 6830 6831 Enum->completeDefinition(Context.DependentTy, Context.DependentTy, 0, 0); 6832 return; 6833 } 6834 6835 // TODO: If the result value doesn't fit in an int, it must be a long or long 6836 // long value. ISO C does not support this, but GCC does as an extension, 6837 // emit a warning. 6838 unsigned IntWidth = Context.Target.getIntWidth(); 6839 unsigned CharWidth = Context.Target.getCharWidth(); 6840 unsigned ShortWidth = Context.Target.getShortWidth(); 6841 6842 // Verify that all the values are okay, compute the size of the values, and 6843 // reverse the list. 6844 unsigned NumNegativeBits = 0; 6845 unsigned NumPositiveBits = 0; 6846 6847 // Keep track of whether all elements have type int. 6848 bool AllElementsInt = true; 6849 6850 for (unsigned i = 0; i != NumElements; ++i) { 6851 EnumConstantDecl *ECD = 6852 cast_or_null<EnumConstantDecl>(Elements[i].getAs<Decl>()); 6853 if (!ECD) continue; // Already issued a diagnostic. 6854 6855 const llvm::APSInt &InitVal = ECD->getInitVal(); 6856 6857 // Keep track of the size of positive and negative values. 6858 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 6859 NumPositiveBits = std::max(NumPositiveBits, 6860 (unsigned)InitVal.getActiveBits()); 6861 else 6862 NumNegativeBits = std::max(NumNegativeBits, 6863 (unsigned)InitVal.getMinSignedBits()); 6864 6865 // Keep track of whether every enum element has type int (very commmon). 6866 if (AllElementsInt) 6867 AllElementsInt = ECD->getType() == Context.IntTy; 6868 } 6869 6870 // Figure out the type that should be used for this enum. 6871 // FIXME: Support -fshort-enums. 6872 QualType BestType; 6873 unsigned BestWidth; 6874 6875 // C++0x N3000 [conv.prom]p3: 6876 // An rvalue of an unscoped enumeration type whose underlying 6877 // type is not fixed can be converted to an rvalue of the first 6878 // of the following types that can represent all the values of 6879 // the enumeration: int, unsigned int, long int, unsigned long 6880 // int, long long int, or unsigned long long int. 6881 // C99 6.4.4.3p2: 6882 // An identifier declared as an enumeration constant has type int. 6883 // The C99 rule is modified by a gcc extension 6884 QualType BestPromotionType; 6885 6886 bool Packed = Enum->getAttr<PackedAttr>() ? true : false; 6887 6888 if (NumNegativeBits) { 6889 // If there is a negative value, figure out the smallest integer type (of 6890 // int/long/longlong) that fits. 6891 // If it's packed, check also if it fits a char or a short. 6892 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) { 6893 BestType = Context.SignedCharTy; 6894 BestWidth = CharWidth; 6895 } else if (Packed && NumNegativeBits <= ShortWidth && 6896 NumPositiveBits < ShortWidth) { 6897 BestType = Context.ShortTy; 6898 BestWidth = ShortWidth; 6899 } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 6900 BestType = Context.IntTy; 6901 BestWidth = IntWidth; 6902 } else { 6903 BestWidth = Context.Target.getLongWidth(); 6904 6905 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) { 6906 BestType = Context.LongTy; 6907 } else { 6908 BestWidth = Context.Target.getLongLongWidth(); 6909 6910 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 6911 Diag(Enum->getLocation(), diag::warn_enum_too_large); 6912 BestType = Context.LongLongTy; 6913 } 6914 } 6915 BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType); 6916 } else { 6917 // If there is no negative value, figure out the smallest type that fits 6918 // all of the enumerator values. 6919 // If it's packed, check also if it fits a char or a short. 6920 if (Packed && NumPositiveBits <= CharWidth) { 6921 BestType = Context.UnsignedCharTy; 6922 BestPromotionType = Context.IntTy; 6923 BestWidth = CharWidth; 6924 } else if (Packed && NumPositiveBits <= ShortWidth) { 6925 BestType = Context.UnsignedShortTy; 6926 BestPromotionType = Context.IntTy; 6927 BestWidth = ShortWidth; 6928 } else if (NumPositiveBits <= IntWidth) { 6929 BestType = Context.UnsignedIntTy; 6930 BestWidth = IntWidth; 6931 BestPromotionType 6932 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 6933 ? Context.UnsignedIntTy : Context.IntTy; 6934 } else if (NumPositiveBits <= 6935 (BestWidth = Context.Target.getLongWidth())) { 6936 BestType = Context.UnsignedLongTy; 6937 BestPromotionType 6938 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 6939 ? Context.UnsignedLongTy : Context.LongTy; 6940 } else { 6941 BestWidth = Context.Target.getLongLongWidth(); 6942 assert(NumPositiveBits <= BestWidth && 6943 "How could an initializer get larger than ULL?"); 6944 BestType = Context.UnsignedLongLongTy; 6945 BestPromotionType 6946 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 6947 ? Context.UnsignedLongLongTy : Context.LongLongTy; 6948 } 6949 } 6950 6951 // Loop over all of the enumerator constants, changing their types to match 6952 // the type of the enum if needed. 6953 for (unsigned i = 0; i != NumElements; ++i) { 6954 EnumConstantDecl *ECD = 6955 cast_or_null<EnumConstantDecl>(Elements[i].getAs<Decl>()); 6956 if (!ECD) continue; // Already issued a diagnostic. 6957 6958 // Standard C says the enumerators have int type, but we allow, as an 6959 // extension, the enumerators to be larger than int size. If each 6960 // enumerator value fits in an int, type it as an int, otherwise type it the 6961 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 6962 // that X has type 'int', not 'unsigned'. 6963 6964 // Determine whether the value fits into an int. 6965 llvm::APSInt InitVal = ECD->getInitVal(); 6966 6967 // If it fits into an integer type, force it. Otherwise force it to match 6968 // the enum decl type. 6969 QualType NewTy; 6970 unsigned NewWidth; 6971 bool NewSign; 6972 if (!getLangOptions().CPlusPlus && 6973 isRepresentableIntegerValue(Context, InitVal, Context.IntTy)) { 6974 NewTy = Context.IntTy; 6975 NewWidth = IntWidth; 6976 NewSign = true; 6977 } else if (ECD->getType() == BestType) { 6978 // Already the right type! 6979 if (getLangOptions().CPlusPlus) 6980 // C++ [dcl.enum]p4: Following the closing brace of an 6981 // enum-specifier, each enumerator has the type of its 6982 // enumeration. 6983 ECD->setType(EnumType); 6984 continue; 6985 } else { 6986 NewTy = BestType; 6987 NewWidth = BestWidth; 6988 NewSign = BestType->isSignedIntegerType(); 6989 } 6990 6991 // Adjust the APSInt value. 6992 InitVal.extOrTrunc(NewWidth); 6993 InitVal.setIsSigned(NewSign); 6994 ECD->setInitVal(InitVal); 6995 6996 // Adjust the Expr initializer and type. 6997 if (ECD->getInitExpr()) 6998 ECD->setInitExpr(ImplicitCastExpr::Create(Context, NewTy, 6999 CastExpr::CK_IntegralCast, 7000 ECD->getInitExpr(), 7001 /*base paths*/ 0, 7002 ImplicitCastExpr::RValue)); 7003 if (getLangOptions().CPlusPlus) 7004 // C++ [dcl.enum]p4: Following the closing brace of an 7005 // enum-specifier, each enumerator has the type of its 7006 // enumeration. 7007 ECD->setType(EnumType); 7008 else 7009 ECD->setType(NewTy); 7010 } 7011 7012 Enum->completeDefinition(BestType, BestPromotionType, 7013 NumPositiveBits, NumNegativeBits); 7014} 7015 7016Sema::DeclPtrTy Sema::ActOnFileScopeAsmDecl(SourceLocation Loc, 7017 ExprArg expr) { 7018 StringLiteral *AsmString = cast<StringLiteral>(expr.takeAs<Expr>()); 7019 7020 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext, 7021 Loc, AsmString); 7022 CurContext->addDecl(New); 7023 return DeclPtrTy::make(New); 7024} 7025 7026void Sema::ActOnPragmaWeakID(IdentifierInfo* Name, 7027 SourceLocation PragmaLoc, 7028 SourceLocation NameLoc) { 7029 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, LookupOrdinaryName); 7030 7031 if (PrevDecl) { 7032 PrevDecl->addAttr(::new (Context) WeakAttr(PragmaLoc, Context)); 7033 } else { 7034 (void)WeakUndeclaredIdentifiers.insert( 7035 std::pair<IdentifierInfo*,WeakInfo> 7036 (Name, WeakInfo((IdentifierInfo*)0, NameLoc))); 7037 } 7038} 7039 7040void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name, 7041 IdentifierInfo* AliasName, 7042 SourceLocation PragmaLoc, 7043 SourceLocation NameLoc, 7044 SourceLocation AliasNameLoc) { 7045 Decl *PrevDecl = LookupSingleName(TUScope, AliasName, AliasNameLoc, 7046 LookupOrdinaryName); 7047 WeakInfo W = WeakInfo(Name, NameLoc); 7048 7049 if (PrevDecl) { 7050 if (!PrevDecl->hasAttr<AliasAttr>()) 7051 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl)) 7052 DeclApplyPragmaWeak(TUScope, ND, W); 7053 } else { 7054 (void)WeakUndeclaredIdentifiers.insert( 7055 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W)); 7056 } 7057} 7058