SemaDecl.cpp revision 696df647c22b4bc632c68777eca1f667ae5dcad4
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/SemaInternal.h" 15#include "clang/Sema/Initialization.h" 16#include "clang/Sema/Lookup.h" 17#include "clang/Sema/CXXFieldCollector.h" 18#include "clang/Sema/Scope.h" 19#include "clang/Sema/ScopeInfo.h" 20#include "TypeLocBuilder.h" 21#include "clang/AST/APValue.h" 22#include "clang/AST/ASTConsumer.h" 23#include "clang/AST/ASTContext.h" 24#include "clang/AST/CXXInheritance.h" 25#include "clang/AST/DeclCXX.h" 26#include "clang/AST/DeclObjC.h" 27#include "clang/AST/DeclTemplate.h" 28#include "clang/AST/EvaluatedExprVisitor.h" 29#include "clang/AST/ExprCXX.h" 30#include "clang/AST/StmtCXX.h" 31#include "clang/AST/CharUnits.h" 32#include "clang/Sema/DeclSpec.h" 33#include "clang/Sema/ParsedTemplate.h" 34#include "clang/Parse/ParseDiagnostic.h" 35#include "clang/Basic/PartialDiagnostic.h" 36#include "clang/Basic/SourceManager.h" 37#include "clang/Basic/TargetInfo.h" 38// FIXME: layering (ideally, Sema shouldn't be dependent on Lex API's) 39#include "clang/Lex/Preprocessor.h" 40#include "clang/Lex/HeaderSearch.h" 41#include "llvm/ADT/Triple.h" 42#include <algorithm> 43#include <cstring> 44#include <functional> 45using namespace clang; 46using namespace sema; 47 48Sema::DeclGroupPtrTy Sema::ConvertDeclToDeclGroup(Decl *Ptr) { 49 return DeclGroupPtrTy::make(DeclGroupRef(Ptr)); 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. 63ParsedType Sema::getTypeName(IdentifierInfo &II, SourceLocation NameLoc, 64 Scope *S, CXXScopeSpec *SS, 65 bool isClassName, bool HasTrailingDot, 66 ParsedType ObjectTypePtr, 67 bool WantNontrivialTypeSourceInfo) { 68 // Determine where we will perform name lookup. 69 DeclContext *LookupCtx = 0; 70 if (ObjectTypePtr) { 71 QualType ObjectType = ObjectTypePtr.get(); 72 if (ObjectType->isRecordType()) 73 LookupCtx = computeDeclContext(ObjectType); 74 } else if (SS && SS->isNotEmpty()) { 75 LookupCtx = computeDeclContext(*SS, false); 76 77 if (!LookupCtx) { 78 if (isDependentScopeSpecifier(*SS)) { 79 // C++ [temp.res]p3: 80 // A qualified-id that refers to a type and in which the 81 // nested-name-specifier depends on a template-parameter (14.6.2) 82 // shall be prefixed by the keyword typename to indicate that the 83 // qualified-id denotes a type, forming an 84 // elaborated-type-specifier (7.1.5.3). 85 // 86 // We therefore do not perform any name lookup if the result would 87 // refer to a member of an unknown specialization. 88 if (!isClassName) 89 return ParsedType(); 90 91 // We know from the grammar that this name refers to a type, 92 // so build a dependent node to describe the type. 93 if (WantNontrivialTypeSourceInfo) 94 return ActOnTypenameType(S, SourceLocation(), *SS, II, NameLoc).get(); 95 96 NestedNameSpecifierLoc QualifierLoc = SS->getWithLocInContext(Context); 97 QualType T = 98 CheckTypenameType(ETK_None, SourceLocation(), QualifierLoc, 99 II, NameLoc); 100 101 return ParsedType::make(T); 102 } 103 104 return ParsedType(); 105 } 106 107 if (!LookupCtx->isDependentContext() && 108 RequireCompleteDeclContext(*SS, LookupCtx)) 109 return ParsedType(); 110 } 111 112 // FIXME: LookupNestedNameSpecifierName isn't the right kind of 113 // lookup for class-names. 114 LookupNameKind Kind = isClassName ? LookupNestedNameSpecifierName : 115 LookupOrdinaryName; 116 LookupResult Result(*this, &II, NameLoc, Kind); 117 if (LookupCtx) { 118 // Perform "qualified" name lookup into the declaration context we 119 // computed, which is either the type of the base of a member access 120 // expression or the declaration context associated with a prior 121 // nested-name-specifier. 122 LookupQualifiedName(Result, LookupCtx); 123 124 if (ObjectTypePtr && Result.empty()) { 125 // C++ [basic.lookup.classref]p3: 126 // If the unqualified-id is ~type-name, the type-name is looked up 127 // in the context of the entire postfix-expression. If the type T of 128 // the object expression is of a class type C, the type-name is also 129 // looked up in the scope of class C. At least one of the lookups shall 130 // find a name that refers to (possibly cv-qualified) T. 131 LookupName(Result, S); 132 } 133 } else { 134 // Perform unqualified name lookup. 135 LookupName(Result, S); 136 } 137 138 NamedDecl *IIDecl = 0; 139 switch (Result.getResultKind()) { 140 case LookupResult::NotFound: 141 case LookupResult::NotFoundInCurrentInstantiation: 142 case LookupResult::FoundOverloaded: 143 case LookupResult::FoundUnresolvedValue: 144 Result.suppressDiagnostics(); 145 return ParsedType(); 146 147 case LookupResult::Ambiguous: 148 // Recover from type-hiding ambiguities by hiding the type. We'll 149 // do the lookup again when looking for an object, and we can 150 // diagnose the error then. If we don't do this, then the error 151 // about hiding the type will be immediately followed by an error 152 // that only makes sense if the identifier was treated like a type. 153 if (Result.getAmbiguityKind() == LookupResult::AmbiguousTagHiding) { 154 Result.suppressDiagnostics(); 155 return ParsedType(); 156 } 157 158 // Look to see if we have a type anywhere in the list of results. 159 for (LookupResult::iterator Res = Result.begin(), ResEnd = Result.end(); 160 Res != ResEnd; ++Res) { 161 if (isa<TypeDecl>(*Res) || isa<ObjCInterfaceDecl>(*Res)) { 162 if (!IIDecl || 163 (*Res)->getLocation().getRawEncoding() < 164 IIDecl->getLocation().getRawEncoding()) 165 IIDecl = *Res; 166 } 167 } 168 169 if (!IIDecl) { 170 // None of the entities we found is a type, so there is no way 171 // to even assume that the result is a type. In this case, don't 172 // complain about the ambiguity. The parser will either try to 173 // perform this lookup again (e.g., as an object name), which 174 // will produce the ambiguity, or will complain that it expected 175 // a type name. 176 Result.suppressDiagnostics(); 177 return ParsedType(); 178 } 179 180 // We found a type within the ambiguous lookup; diagnose the 181 // ambiguity and then return that type. This might be the right 182 // answer, or it might not be, but it suppresses any attempt to 183 // perform the name lookup again. 184 break; 185 186 case LookupResult::Found: 187 IIDecl = Result.getFoundDecl(); 188 break; 189 } 190 191 assert(IIDecl && "Didn't find decl"); 192 193 QualType T; 194 if (TypeDecl *TD = dyn_cast<TypeDecl>(IIDecl)) { 195 DiagnoseUseOfDecl(IIDecl, NameLoc); 196 197 if (T.isNull()) 198 T = Context.getTypeDeclType(TD); 199 200 if (SS && SS->isNotEmpty()) { 201 if (WantNontrivialTypeSourceInfo) { 202 // Construct a type with type-source information. 203 TypeLocBuilder Builder; 204 Builder.pushTypeSpec(T).setNameLoc(NameLoc); 205 206 T = getElaboratedType(ETK_None, *SS, T); 207 ElaboratedTypeLoc ElabTL = Builder.push<ElaboratedTypeLoc>(T); 208 ElabTL.setKeywordLoc(SourceLocation()); 209 ElabTL.setQualifierLoc(SS->getWithLocInContext(Context)); 210 return CreateParsedType(T, Builder.getTypeSourceInfo(Context, T)); 211 } else { 212 T = getElaboratedType(ETK_None, *SS, T); 213 } 214 } 215 } else if (ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(IIDecl)) { 216 (void)DiagnoseUseOfDecl(IDecl, NameLoc); 217 if (!HasTrailingDot) 218 T = Context.getObjCInterfaceType(IDecl); 219 } 220 221 if (T.isNull()) { 222 // If it's not plausibly a type, suppress diagnostics. 223 Result.suppressDiagnostics(); 224 return ParsedType(); 225 } 226 return ParsedType::make(T); 227} 228 229/// isTagName() - This method is called *for error recovery purposes only* 230/// to determine if the specified name is a valid tag name ("struct foo"). If 231/// so, this returns the TST for the tag corresponding to it (TST_enum, 232/// TST_union, TST_struct, TST_class). This is used to diagnose cases in C 233/// where the user forgot to specify the tag. 234DeclSpec::TST Sema::isTagName(IdentifierInfo &II, Scope *S) { 235 // Do a tag name lookup in this scope. 236 LookupResult R(*this, &II, SourceLocation(), LookupTagName); 237 LookupName(R, S, false); 238 R.suppressDiagnostics(); 239 if (R.getResultKind() == LookupResult::Found) 240 if (const TagDecl *TD = R.getAsSingle<TagDecl>()) { 241 switch (TD->getTagKind()) { 242 default: return DeclSpec::TST_unspecified; 243 case TTK_Struct: return DeclSpec::TST_struct; 244 case TTK_Union: return DeclSpec::TST_union; 245 case TTK_Class: return DeclSpec::TST_class; 246 case TTK_Enum: return DeclSpec::TST_enum; 247 } 248 } 249 250 return DeclSpec::TST_unspecified; 251} 252 253/// isMicrosoftMissingTypename - In Microsoft mode, within class scope, 254/// if a CXXScopeSpec's type is equal to the type of one of the base classes 255/// then downgrade the missing typename error to a warning. 256/// This is needed for MSVC compatibility; Example: 257/// @code 258/// template<class T> class A { 259/// public: 260/// typedef int TYPE; 261/// }; 262/// template<class T> class B : public A<T> { 263/// public: 264/// A<T>::TYPE a; // no typename required because A<T> is a base class. 265/// }; 266/// @endcode 267bool Sema::isMicrosoftMissingTypename(const CXXScopeSpec *SS) { 268 if (CurContext->isRecord()) { 269 const Type *Ty = SS->getScopeRep()->getAsType(); 270 271 CXXRecordDecl *RD = cast<CXXRecordDecl>(CurContext); 272 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 273 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) 274 if (Context.hasSameUnqualifiedType(QualType(Ty, 1), Base->getType())) 275 return true; 276 } 277 return false; 278} 279 280bool Sema::DiagnoseUnknownTypeName(const IdentifierInfo &II, 281 SourceLocation IILoc, 282 Scope *S, 283 CXXScopeSpec *SS, 284 ParsedType &SuggestedType) { 285 // We don't have anything to suggest (yet). 286 SuggestedType = ParsedType(); 287 288 // There may have been a typo in the name of the type. Look up typo 289 // results, in case we have something that we can suggest. 290 LookupResult Lookup(*this, &II, IILoc, LookupOrdinaryName, 291 NotForRedeclaration); 292 293 if (DeclarationName Corrected = CorrectTypo(Lookup, S, SS, 0, 0, CTC_Type)) { 294 if (NamedDecl *Result = Lookup.getAsSingle<NamedDecl>()) { 295 if ((isa<TypeDecl>(Result) || isa<ObjCInterfaceDecl>(Result)) && 296 !Result->isInvalidDecl()) { 297 // We found a similarly-named type or interface; suggest that. 298 if (!SS || !SS->isSet()) 299 Diag(IILoc, diag::err_unknown_typename_suggest) 300 << &II << Lookup.getLookupName() 301 << FixItHint::CreateReplacement(SourceRange(IILoc), 302 Result->getNameAsString()); 303 else if (DeclContext *DC = computeDeclContext(*SS, false)) 304 Diag(IILoc, diag::err_unknown_nested_typename_suggest) 305 << &II << DC << Lookup.getLookupName() << SS->getRange() 306 << FixItHint::CreateReplacement(SourceRange(IILoc), 307 Result->getNameAsString()); 308 else 309 llvm_unreachable("could not have corrected a typo here"); 310 311 Diag(Result->getLocation(), diag::note_previous_decl) 312 << Result->getDeclName(); 313 314 SuggestedType = getTypeName(*Result->getIdentifier(), IILoc, S, SS, 315 false, false, ParsedType(), 316 /*NonTrivialTypeSourceInfo=*/true); 317 return true; 318 } 319 } else if (Lookup.empty()) { 320 // We corrected to a keyword. 321 // FIXME: Actually recover with the keyword we suggest, and emit a fix-it. 322 Diag(IILoc, diag::err_unknown_typename_suggest) 323 << &II << Corrected; 324 return true; 325 } 326 } 327 328 if (getLangOptions().CPlusPlus) { 329 // See if II is a class template that the user forgot to pass arguments to. 330 UnqualifiedId Name; 331 Name.setIdentifier(&II, IILoc); 332 CXXScopeSpec EmptySS; 333 TemplateTy TemplateResult; 334 bool MemberOfUnknownSpecialization; 335 if (isTemplateName(S, SS ? *SS : EmptySS, /*hasTemplateKeyword=*/false, 336 Name, ParsedType(), true, TemplateResult, 337 MemberOfUnknownSpecialization) == TNK_Type_template) { 338 TemplateName TplName = TemplateResult.getAsVal<TemplateName>(); 339 Diag(IILoc, diag::err_template_missing_args) << TplName; 340 if (TemplateDecl *TplDecl = TplName.getAsTemplateDecl()) { 341 Diag(TplDecl->getLocation(), diag::note_template_decl_here) 342 << TplDecl->getTemplateParameters()->getSourceRange(); 343 } 344 return true; 345 } 346 } 347 348 // FIXME: Should we move the logic that tries to recover from a missing tag 349 // (struct, union, enum) from Parser::ParseImplicitInt here, instead? 350 351 if (!SS || (!SS->isSet() && !SS->isInvalid())) 352 Diag(IILoc, diag::err_unknown_typename) << &II; 353 else if (DeclContext *DC = computeDeclContext(*SS, false)) 354 Diag(IILoc, diag::err_typename_nested_not_found) 355 << &II << DC << SS->getRange(); 356 else if (isDependentScopeSpecifier(*SS)) { 357 unsigned DiagID = diag::err_typename_missing; 358 if (getLangOptions().Microsoft && isMicrosoftMissingTypename(SS)) 359 DiagID = diag::warn_typename_missing; 360 361 Diag(SS->getRange().getBegin(), DiagID) 362 << (NestedNameSpecifier *)SS->getScopeRep() << II.getName() 363 << SourceRange(SS->getRange().getBegin(), IILoc) 364 << FixItHint::CreateInsertion(SS->getRange().getBegin(), "typename "); 365 SuggestedType = ActOnTypenameType(S, SourceLocation(), *SS, II, IILoc).get(); 366 } else { 367 assert(SS && SS->isInvalid() && 368 "Invalid scope specifier has already been diagnosed"); 369 } 370 371 return true; 372} 373 374/// \brief Determine whether the given result set contains either a type name 375/// or 376static bool isResultTypeOrTemplate(LookupResult &R, const Token &NextToken) { 377 bool CheckTemplate = R.getSema().getLangOptions().CPlusPlus && 378 NextToken.is(tok::less); 379 380 for (LookupResult::iterator I = R.begin(), IEnd = R.end(); I != IEnd; ++I) { 381 if (isa<TypeDecl>(*I) || isa<ObjCInterfaceDecl>(*I)) 382 return true; 383 384 if (CheckTemplate && isa<TemplateDecl>(*I)) 385 return true; 386 } 387 388 return false; 389} 390 391Sema::NameClassification Sema::ClassifyName(Scope *S, 392 CXXScopeSpec &SS, 393 IdentifierInfo *&Name, 394 SourceLocation NameLoc, 395 const Token &NextToken) { 396 DeclarationNameInfo NameInfo(Name, NameLoc); 397 ObjCMethodDecl *CurMethod = getCurMethodDecl(); 398 399 if (NextToken.is(tok::coloncolon)) { 400 BuildCXXNestedNameSpecifier(S, *Name, NameLoc, NextToken.getLocation(), 401 QualType(), false, SS, 0, false); 402 403 } 404 405 LookupResult Result(*this, Name, NameLoc, LookupOrdinaryName); 406 LookupParsedName(Result, S, &SS, !CurMethod); 407 408 // Perform lookup for Objective-C instance variables (including automatically 409 // synthesized instance variables), if we're in an Objective-C method. 410 // FIXME: This lookup really, really needs to be folded in to the normal 411 // unqualified lookup mechanism. 412 if (!SS.isSet() && CurMethod && !isResultTypeOrTemplate(Result, NextToken)) { 413 ExprResult E = LookupInObjCMethod(Result, S, Name, true); 414 if (E.get() || E.isInvalid()) 415 return E; 416 417 // Synthesize ivars lazily. 418 if (getLangOptions().ObjCDefaultSynthProperties && 419 getLangOptions().ObjCNonFragileABI2) { 420 if (SynthesizeProvisionalIvar(Result, Name, NameLoc)) { 421 if (const ObjCPropertyDecl *Property = 422 canSynthesizeProvisionalIvar(Name)) { 423 Diag(NameLoc, diag::warn_synthesized_ivar_access) << Name; 424 Diag(Property->getLocation(), diag::note_property_declare); 425 } 426 427 // FIXME: This is strange. Shouldn't we just take the ivar returned 428 // from SynthesizeProvisionalIvar and continue with that? 429 E = LookupInObjCMethod(Result, S, Name, true); 430 if (E.get() || E.isInvalid()) 431 return E; 432 } 433 } 434 } 435 436 bool SecondTry = false; 437 bool IsFilteredTemplateName = false; 438 439Corrected: 440 switch (Result.getResultKind()) { 441 case LookupResult::NotFound: 442 // If an unqualified-id is followed by a '(', then we have a function 443 // call. 444 if (!SS.isSet() && NextToken.is(tok::l_paren)) { 445 // In C++, this is an ADL-only call. 446 // FIXME: Reference? 447 if (getLangOptions().CPlusPlus) 448 return BuildDeclarationNameExpr(SS, Result, /*ADL=*/true); 449 450 // C90 6.3.2.2: 451 // If the expression that precedes the parenthesized argument list in a 452 // function call consists solely of an identifier, and if no 453 // declaration is visible for this identifier, the identifier is 454 // implicitly declared exactly as if, in the innermost block containing 455 // the function call, the declaration 456 // 457 // extern int identifier (); 458 // 459 // appeared. 460 // 461 // We also allow this in C99 as an extension. 462 if (NamedDecl *D = ImplicitlyDefineFunction(NameLoc, *Name, S)) { 463 Result.addDecl(D); 464 Result.resolveKind(); 465 return BuildDeclarationNameExpr(SS, Result, /*ADL=*/false); 466 } 467 } 468 469 // In C, we first see whether there is a tag type by the same name, in 470 // which case it's likely that the user just forget to write "enum", 471 // "struct", or "union". 472 if (!getLangOptions().CPlusPlus && !SecondTry) { 473 Result.clear(LookupTagName); 474 LookupParsedName(Result, S, &SS); 475 if (TagDecl *Tag = Result.getAsSingle<TagDecl>()) { 476 const char *TagName = 0; 477 const char *FixItTagName = 0; 478 switch (Tag->getTagKind()) { 479 case TTK_Class: 480 TagName = "class"; 481 FixItTagName = "class "; 482 break; 483 484 case TTK_Enum: 485 TagName = "enum"; 486 FixItTagName = "enum "; 487 break; 488 489 case TTK_Struct: 490 TagName = "struct"; 491 FixItTagName = "struct "; 492 break; 493 494 case TTK_Union: 495 TagName = "union"; 496 FixItTagName = "union "; 497 break; 498 } 499 500 Diag(NameLoc, diag::err_use_of_tag_name_without_tag) 501 << Name << TagName << getLangOptions().CPlusPlus 502 << FixItHint::CreateInsertion(NameLoc, FixItTagName); 503 break; 504 } 505 506 Result.clear(LookupOrdinaryName); 507 } 508 509 // Perform typo correction to determine if there is another name that is 510 // close to this name. 511 if (!SecondTry) { 512 if (DeclarationName Corrected = CorrectTypo(Result, S, &SS)) { 513 unsigned UnqualifiedDiag = diag::err_undeclared_var_use_suggest; 514 unsigned QualifiedDiag = diag::err_no_member_suggest; 515 516 NamedDecl *FirstDecl = Result.empty()? 0 : *Result.begin(); 517 NamedDecl *UnderlyingFirstDecl 518 = FirstDecl? FirstDecl->getUnderlyingDecl() : 0; 519 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) && 520 UnderlyingFirstDecl && isa<TemplateDecl>(UnderlyingFirstDecl)) { 521 UnqualifiedDiag = diag::err_no_template_suggest; 522 QualifiedDiag = diag::err_no_member_template_suggest; 523 } else if (UnderlyingFirstDecl && 524 (isa<TypeDecl>(UnderlyingFirstDecl) || 525 isa<ObjCInterfaceDecl>(UnderlyingFirstDecl) || 526 isa<ObjCCompatibleAliasDecl>(UnderlyingFirstDecl))) { 527 UnqualifiedDiag = diag::err_unknown_typename_suggest; 528 QualifiedDiag = diag::err_unknown_nested_typename_suggest; 529 } 530 531 if (SS.isEmpty()) 532 Diag(NameLoc, UnqualifiedDiag) 533 << Name << Corrected 534 << FixItHint::CreateReplacement(NameLoc, Corrected.getAsString()); 535 else 536 Diag(NameLoc, QualifiedDiag) 537 << Name << computeDeclContext(SS, false) << Corrected 538 << SS.getRange() 539 << FixItHint::CreateReplacement(NameLoc, Corrected.getAsString()); 540 541 // Update the name, so that the caller has the new name. 542 Name = Corrected.getAsIdentifierInfo(); 543 544 // Typo correction corrected to a keyword. 545 if (Result.empty()) 546 return Corrected.getAsIdentifierInfo(); 547 548 Diag(FirstDecl->getLocation(), diag::note_previous_decl) 549 << FirstDecl->getDeclName(); 550 551 // If we found an Objective-C instance variable, let 552 // LookupInObjCMethod build the appropriate expression to 553 // reference the ivar. 554 // FIXME: This is a gross hack. 555 if (ObjCIvarDecl *Ivar = Result.getAsSingle<ObjCIvarDecl>()) { 556 Result.clear(); 557 ExprResult E(LookupInObjCMethod(Result, S, Ivar->getIdentifier())); 558 return move(E); 559 } 560 561 goto Corrected; 562 } 563 } 564 565 // We failed to correct; just fall through and let the parser deal with it. 566 Result.suppressDiagnostics(); 567 return NameClassification::Unknown(); 568 569 case LookupResult::NotFoundInCurrentInstantiation: 570 // We performed name lookup into the current instantiation, and there were 571 // dependent bases, so we treat this result the same way as any other 572 // dependent nested-name-specifier. 573 574 // C++ [temp.res]p2: 575 // A name used in a template declaration or definition and that is 576 // dependent on a template-parameter is assumed not to name a type 577 // unless the applicable name lookup finds a type name or the name is 578 // qualified by the keyword typename. 579 // 580 // FIXME: If the next token is '<', we might want to ask the parser to 581 // perform some heroics to see if we actually have a 582 // template-argument-list, which would indicate a missing 'template' 583 // keyword here. 584 return BuildDependentDeclRefExpr(SS, NameInfo, /*TemplateArgs=*/0); 585 586 case LookupResult::Found: 587 case LookupResult::FoundOverloaded: 588 case LookupResult::FoundUnresolvedValue: 589 break; 590 591 case LookupResult::Ambiguous: 592 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) && 593 hasAnyAcceptableTemplateNames(Result)) { 594 // C++ [temp.local]p3: 595 // A lookup that finds an injected-class-name (10.2) can result in an 596 // ambiguity in certain cases (for example, if it is found in more than 597 // one base class). If all of the injected-class-names that are found 598 // refer to specializations of the same class template, and if the name 599 // is followed by a template-argument-list, the reference refers to the 600 // class template itself and not a specialization thereof, and is not 601 // ambiguous. 602 // 603 // This filtering can make an ambiguous result into an unambiguous one, 604 // so try again after filtering out template names. 605 FilterAcceptableTemplateNames(Result); 606 if (!Result.isAmbiguous()) { 607 IsFilteredTemplateName = true; 608 break; 609 } 610 } 611 612 // Diagnose the ambiguity and return an error. 613 return NameClassification::Error(); 614 } 615 616 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) && 617 (IsFilteredTemplateName || hasAnyAcceptableTemplateNames(Result))) { 618 // C++ [temp.names]p3: 619 // After name lookup (3.4) finds that a name is a template-name or that 620 // an operator-function-id or a literal- operator-id refers to a set of 621 // overloaded functions any member of which is a function template if 622 // this is followed by a <, the < is always taken as the delimiter of a 623 // template-argument-list and never as the less-than operator. 624 if (!IsFilteredTemplateName) 625 FilterAcceptableTemplateNames(Result); 626 627 if (!Result.empty()) { 628 bool IsFunctionTemplate; 629 TemplateName Template; 630 if (Result.end() - Result.begin() > 1) { 631 IsFunctionTemplate = true; 632 Template = Context.getOverloadedTemplateName(Result.begin(), 633 Result.end()); 634 } else { 635 TemplateDecl *TD 636 = cast<TemplateDecl>((*Result.begin())->getUnderlyingDecl()); 637 IsFunctionTemplate = isa<FunctionTemplateDecl>(TD); 638 639 if (SS.isSet() && !SS.isInvalid()) 640 Template = Context.getQualifiedTemplateName(SS.getScopeRep(), 641 /*TemplateKeyword=*/false, 642 TD); 643 else 644 Template = TemplateName(TD); 645 } 646 647 if (IsFunctionTemplate) { 648 // Function templates always go through overload resolution, at which 649 // point we'll perform the various checks (e.g., accessibility) we need 650 // to based on which function we selected. 651 Result.suppressDiagnostics(); 652 653 return NameClassification::FunctionTemplate(Template); 654 } 655 656 return NameClassification::TypeTemplate(Template); 657 } 658 } 659 660 NamedDecl *FirstDecl = (*Result.begin())->getUnderlyingDecl(); 661 if (TypeDecl *Type = dyn_cast<TypeDecl>(FirstDecl)) { 662 DiagnoseUseOfDecl(Type, NameLoc); 663 QualType T = Context.getTypeDeclType(Type); 664 return ParsedType::make(T); 665 } 666 667 ObjCInterfaceDecl *Class = dyn_cast<ObjCInterfaceDecl>(FirstDecl); 668 if (!Class) { 669 // FIXME: It's unfortunate that we don't have a Type node for handling this. 670 if (ObjCCompatibleAliasDecl *Alias 671 = dyn_cast<ObjCCompatibleAliasDecl>(FirstDecl)) 672 Class = Alias->getClassInterface(); 673 } 674 675 if (Class) { 676 DiagnoseUseOfDecl(Class, NameLoc); 677 678 if (NextToken.is(tok::period)) { 679 // Interface. <something> is parsed as a property reference expression. 680 // Just return "unknown" as a fall-through for now. 681 Result.suppressDiagnostics(); 682 return NameClassification::Unknown(); 683 } 684 685 QualType T = Context.getObjCInterfaceType(Class); 686 return ParsedType::make(T); 687 } 688 689 if (!Result.empty() && (*Result.begin())->isCXXClassMember()) 690 return BuildPossibleImplicitMemberExpr(SS, Result, 0); 691 692 bool ADL = UseArgumentDependentLookup(SS, Result, NextToken.is(tok::l_paren)); 693 return BuildDeclarationNameExpr(SS, Result, ADL); 694} 695 696// Determines the context to return to after temporarily entering a 697// context. This depends in an unnecessarily complicated way on the 698// exact ordering of callbacks from the parser. 699DeclContext *Sema::getContainingDC(DeclContext *DC) { 700 701 // Functions defined inline within classes aren't parsed until we've 702 // finished parsing the top-level class, so the top-level class is 703 // the context we'll need to return to. 704 if (isa<FunctionDecl>(DC)) { 705 DC = DC->getLexicalParent(); 706 707 // A function not defined within a class will always return to its 708 // lexical context. 709 if (!isa<CXXRecordDecl>(DC)) 710 return DC; 711 712 // A C++ inline method/friend is parsed *after* the topmost class 713 // it was declared in is fully parsed ("complete"); the topmost 714 // class is the context we need to return to. 715 while (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC->getLexicalParent())) 716 DC = RD; 717 718 // Return the declaration context of the topmost class the inline method is 719 // declared in. 720 return DC; 721 } 722 723 // ObjCMethodDecls are parsed (for some reason) outside the context 724 // of the class. 725 if (isa<ObjCMethodDecl>(DC)) 726 return DC->getLexicalParent()->getLexicalParent(); 727 728 return DC->getLexicalParent(); 729} 730 731void Sema::PushDeclContext(Scope *S, DeclContext *DC) { 732 assert(getContainingDC(DC) == CurContext && 733 "The next DeclContext should be lexically contained in the current one."); 734 CurContext = DC; 735 S->setEntity(DC); 736} 737 738void Sema::PopDeclContext() { 739 assert(CurContext && "DeclContext imbalance!"); 740 741 CurContext = getContainingDC(CurContext); 742 assert(CurContext && "Popped translation unit!"); 743} 744 745/// EnterDeclaratorContext - Used when we must lookup names in the context 746/// of a declarator's nested name specifier. 747/// 748void Sema::EnterDeclaratorContext(Scope *S, DeclContext *DC) { 749 // C++0x [basic.lookup.unqual]p13: 750 // A name used in the definition of a static data member of class 751 // X (after the qualified-id of the static member) is looked up as 752 // if the name was used in a member function of X. 753 // C++0x [basic.lookup.unqual]p14: 754 // If a variable member of a namespace is defined outside of the 755 // scope of its namespace then any name used in the definition of 756 // the variable member (after the declarator-id) is looked up as 757 // if the definition of the variable member occurred in its 758 // namespace. 759 // Both of these imply that we should push a scope whose context 760 // is the semantic context of the declaration. We can't use 761 // PushDeclContext here because that context is not necessarily 762 // lexically contained in the current context. Fortunately, 763 // the containing scope should have the appropriate information. 764 765 assert(!S->getEntity() && "scope already has entity"); 766 767#ifndef NDEBUG 768 Scope *Ancestor = S->getParent(); 769 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 770 assert(Ancestor->getEntity() == CurContext && "ancestor context mismatch"); 771#endif 772 773 CurContext = DC; 774 S->setEntity(DC); 775} 776 777void Sema::ExitDeclaratorContext(Scope *S) { 778 assert(S->getEntity() == CurContext && "Context imbalance!"); 779 780 // Switch back to the lexical context. The safety of this is 781 // enforced by an assert in EnterDeclaratorContext. 782 Scope *Ancestor = S->getParent(); 783 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 784 CurContext = (DeclContext*) Ancestor->getEntity(); 785 786 // We don't need to do anything with the scope, which is going to 787 // disappear. 788} 789 790/// \brief Determine whether we allow overloading of the function 791/// PrevDecl with another declaration. 792/// 793/// This routine determines whether overloading is possible, not 794/// whether some new function is actually an overload. It will return 795/// true in C++ (where we can always provide overloads) or, as an 796/// extension, in C when the previous function is already an 797/// overloaded function declaration or has the "overloadable" 798/// attribute. 799static bool AllowOverloadingOfFunction(LookupResult &Previous, 800 ASTContext &Context) { 801 if (Context.getLangOptions().CPlusPlus) 802 return true; 803 804 if (Previous.getResultKind() == LookupResult::FoundOverloaded) 805 return true; 806 807 return (Previous.getResultKind() == LookupResult::Found 808 && Previous.getFoundDecl()->hasAttr<OverloadableAttr>()); 809} 810 811/// Add this decl to the scope shadowed decl chains. 812void Sema::PushOnScopeChains(NamedDecl *D, Scope *S, bool AddToContext) { 813 // Move up the scope chain until we find the nearest enclosing 814 // non-transparent context. The declaration will be introduced into this 815 // scope. 816 while (S->getEntity() && 817 ((DeclContext *)S->getEntity())->isTransparentContext()) 818 S = S->getParent(); 819 820 // Add scoped declarations into their context, so that they can be 821 // found later. Declarations without a context won't be inserted 822 // into any context. 823 if (AddToContext) 824 CurContext->addDecl(D); 825 826 // Out-of-line definitions shouldn't be pushed into scope in C++. 827 // Out-of-line variable and function definitions shouldn't even in C. 828 if ((getLangOptions().CPlusPlus || isa<VarDecl>(D) || isa<FunctionDecl>(D)) && 829 D->isOutOfLine()) 830 return; 831 832 // Template instantiations should also not be pushed into scope. 833 if (isa<FunctionDecl>(D) && 834 cast<FunctionDecl>(D)->isFunctionTemplateSpecialization()) 835 return; 836 837 // If this replaces anything in the current scope, 838 IdentifierResolver::iterator I = IdResolver.begin(D->getDeclName()), 839 IEnd = IdResolver.end(); 840 for (; I != IEnd; ++I) { 841 if (S->isDeclScope(*I) && D->declarationReplaces(*I)) { 842 S->RemoveDecl(*I); 843 IdResolver.RemoveDecl(*I); 844 845 // Should only need to replace one decl. 846 break; 847 } 848 } 849 850 S->AddDecl(D); 851 852 if (isa<LabelDecl>(D) && !cast<LabelDecl>(D)->isGnuLocal()) { 853 // Implicitly-generated labels may end up getting generated in an order that 854 // isn't strictly lexical, which breaks name lookup. Be careful to insert 855 // the label at the appropriate place in the identifier chain. 856 for (I = IdResolver.begin(D->getDeclName()); I != IEnd; ++I) { 857 DeclContext *IDC = (*I)->getLexicalDeclContext()->getRedeclContext(); 858 if (IDC == CurContext) { 859 if (!S->isDeclScope(*I)) 860 continue; 861 } else if (IDC->Encloses(CurContext)) 862 break; 863 } 864 865 IdResolver.InsertDeclAfter(I, D); 866 } else { 867 IdResolver.AddDecl(D); 868 } 869} 870 871bool Sema::isDeclInScope(NamedDecl *&D, DeclContext *Ctx, Scope *S, 872 bool ExplicitInstantiationOrSpecialization) { 873 return IdResolver.isDeclInScope(D, Ctx, Context, S, 874 ExplicitInstantiationOrSpecialization); 875} 876 877Scope *Sema::getScopeForDeclContext(Scope *S, DeclContext *DC) { 878 DeclContext *TargetDC = DC->getPrimaryContext(); 879 do { 880 if (DeclContext *ScopeDC = (DeclContext*) S->getEntity()) 881 if (ScopeDC->getPrimaryContext() == TargetDC) 882 return S; 883 } while ((S = S->getParent())); 884 885 return 0; 886} 887 888static bool isOutOfScopePreviousDeclaration(NamedDecl *, 889 DeclContext*, 890 ASTContext&); 891 892/// Filters out lookup results that don't fall within the given scope 893/// as determined by isDeclInScope. 894void Sema::FilterLookupForScope(LookupResult &R, 895 DeclContext *Ctx, Scope *S, 896 bool ConsiderLinkage, 897 bool ExplicitInstantiationOrSpecialization) { 898 LookupResult::Filter F = R.makeFilter(); 899 while (F.hasNext()) { 900 NamedDecl *D = F.next(); 901 902 if (isDeclInScope(D, Ctx, S, ExplicitInstantiationOrSpecialization)) 903 continue; 904 905 if (ConsiderLinkage && 906 isOutOfScopePreviousDeclaration(D, Ctx, Context)) 907 continue; 908 909 F.erase(); 910 } 911 912 F.done(); 913} 914 915static bool isUsingDecl(NamedDecl *D) { 916 return isa<UsingShadowDecl>(D) || 917 isa<UnresolvedUsingTypenameDecl>(D) || 918 isa<UnresolvedUsingValueDecl>(D); 919} 920 921/// Removes using shadow declarations from the lookup results. 922static void RemoveUsingDecls(LookupResult &R) { 923 LookupResult::Filter F = R.makeFilter(); 924 while (F.hasNext()) 925 if (isUsingDecl(F.next())) 926 F.erase(); 927 928 F.done(); 929} 930 931/// \brief Check for this common pattern: 932/// @code 933/// class S { 934/// S(const S&); // DO NOT IMPLEMENT 935/// void operator=(const S&); // DO NOT IMPLEMENT 936/// }; 937/// @endcode 938static bool IsDisallowedCopyOrAssign(const CXXMethodDecl *D) { 939 // FIXME: Should check for private access too but access is set after we get 940 // the decl here. 941 if (D->doesThisDeclarationHaveABody()) 942 return false; 943 944 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(D)) 945 return CD->isCopyConstructor(); 946 if (const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 947 return Method->isCopyAssignmentOperator(); 948 return false; 949} 950 951bool Sema::ShouldWarnIfUnusedFileScopedDecl(const DeclaratorDecl *D) const { 952 assert(D); 953 954 if (D->isInvalidDecl() || D->isUsed() || D->hasAttr<UnusedAttr>()) 955 return false; 956 957 // Ignore class templates. 958 if (D->getDeclContext()->isDependentContext() || 959 D->getLexicalDeclContext()->isDependentContext()) 960 return false; 961 962 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 963 if (FD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 964 return false; 965 966 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 967 if (MD->isVirtual() || IsDisallowedCopyOrAssign(MD)) 968 return false; 969 } else { 970 // 'static inline' functions are used in headers; don't warn. 971 if (FD->getStorageClass() == SC_Static && 972 FD->isInlineSpecified()) 973 return false; 974 } 975 976 if (FD->doesThisDeclarationHaveABody() && 977 Context.DeclMustBeEmitted(FD)) 978 return false; 979 } else if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 980 if (!VD->isFileVarDecl() || 981 VD->getType().isConstant(Context) || 982 Context.DeclMustBeEmitted(VD)) 983 return false; 984 985 if (VD->isStaticDataMember() && 986 VD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 987 return false; 988 989 } else { 990 return false; 991 } 992 993 // Only warn for unused decls internal to the translation unit. 994 if (D->getLinkage() == ExternalLinkage) 995 return false; 996 997 return true; 998} 999 1000void Sema::MarkUnusedFileScopedDecl(const DeclaratorDecl *D) { 1001 if (!D) 1002 return; 1003 1004 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 1005 const FunctionDecl *First = FD->getFirstDeclaration(); 1006 if (FD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 1007 return; // First should already be in the vector. 1008 } 1009 1010 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1011 const VarDecl *First = VD->getFirstDeclaration(); 1012 if (VD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 1013 return; // First should already be in the vector. 1014 } 1015 1016 if (ShouldWarnIfUnusedFileScopedDecl(D)) 1017 UnusedFileScopedDecls.push_back(D); 1018 } 1019 1020static bool ShouldDiagnoseUnusedDecl(const NamedDecl *D) { 1021 if (D->isInvalidDecl()) 1022 return false; 1023 1024 if (D->isUsed() || D->hasAttr<UnusedAttr>()) 1025 return false; 1026 1027 if (isa<LabelDecl>(D)) 1028 return true; 1029 1030 // White-list anything that isn't a local variable. 1031 if (!isa<VarDecl>(D) || isa<ParmVarDecl>(D) || isa<ImplicitParamDecl>(D) || 1032 !D->getDeclContext()->isFunctionOrMethod()) 1033 return false; 1034 1035 // Types of valid local variables should be complete, so this should succeed. 1036 if (const ValueDecl *VD = dyn_cast<ValueDecl>(D)) { 1037 1038 // White-list anything with an __attribute__((unused)) type. 1039 QualType Ty = VD->getType(); 1040 1041 // Only look at the outermost level of typedef. 1042 if (const TypedefType *TT = dyn_cast<TypedefType>(Ty)) { 1043 if (TT->getDecl()->hasAttr<UnusedAttr>()) 1044 return false; 1045 } 1046 1047 // If we failed to complete the type for some reason, or if the type is 1048 // dependent, don't diagnose the variable. 1049 if (Ty->isIncompleteType() || Ty->isDependentType()) 1050 return false; 1051 1052 if (const TagType *TT = Ty->getAs<TagType>()) { 1053 const TagDecl *Tag = TT->getDecl(); 1054 if (Tag->hasAttr<UnusedAttr>()) 1055 return false; 1056 1057 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Tag)) { 1058 // FIXME: Checking for the presence of a user-declared constructor 1059 // isn't completely accurate; we'd prefer to check that the initializer 1060 // has no side effects. 1061 if (RD->hasUserDeclaredConstructor() || !RD->hasTrivialDestructor()) 1062 return false; 1063 } 1064 } 1065 1066 // TODO: __attribute__((unused)) templates? 1067 } 1068 1069 return true; 1070} 1071 1072/// DiagnoseUnusedDecl - Emit warnings about declarations that are not used 1073/// unless they are marked attr(unused). 1074void Sema::DiagnoseUnusedDecl(const NamedDecl *D) { 1075 if (!ShouldDiagnoseUnusedDecl(D)) 1076 return; 1077 1078 unsigned DiagID; 1079 if (isa<VarDecl>(D) && cast<VarDecl>(D)->isExceptionVariable()) 1080 DiagID = diag::warn_unused_exception_param; 1081 else if (isa<LabelDecl>(D)) 1082 DiagID = diag::warn_unused_label; 1083 else 1084 DiagID = diag::warn_unused_variable; 1085 1086 Diag(D->getLocation(), DiagID) << D->getDeclName(); 1087} 1088 1089static void CheckPoppedLabel(LabelDecl *L, Sema &S) { 1090 // Verify that we have no forward references left. If so, there was a goto 1091 // or address of a label taken, but no definition of it. Label fwd 1092 // definitions are indicated with a null substmt. 1093 if (L->getStmt() == 0) 1094 S.Diag(L->getLocation(), diag::err_undeclared_label_use) <<L->getDeclName(); 1095} 1096 1097void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) { 1098 if (S->decl_empty()) return; 1099 assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) && 1100 "Scope shouldn't contain decls!"); 1101 1102 for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end(); 1103 I != E; ++I) { 1104 Decl *TmpD = (*I); 1105 assert(TmpD && "This decl didn't get pushed??"); 1106 1107 assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?"); 1108 NamedDecl *D = cast<NamedDecl>(TmpD); 1109 1110 if (!D->getDeclName()) continue; 1111 1112 // Diagnose unused variables in this scope. 1113 if (!S->hasErrorOccurred()) 1114 DiagnoseUnusedDecl(D); 1115 1116 // If this was a forward reference to a label, verify it was defined. 1117 if (LabelDecl *LD = dyn_cast<LabelDecl>(D)) 1118 CheckPoppedLabel(LD, *this); 1119 1120 // Remove this name from our lexical scope. 1121 IdResolver.RemoveDecl(D); 1122 } 1123} 1124 1125/// \brief Look for an Objective-C class in the translation unit. 1126/// 1127/// \param Id The name of the Objective-C class we're looking for. If 1128/// typo-correction fixes this name, the Id will be updated 1129/// to the fixed name. 1130/// 1131/// \param IdLoc The location of the name in the translation unit. 1132/// 1133/// \param TypoCorrection If true, this routine will attempt typo correction 1134/// if there is no class with the given name. 1135/// 1136/// \returns The declaration of the named Objective-C class, or NULL if the 1137/// class could not be found. 1138ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *&Id, 1139 SourceLocation IdLoc, 1140 bool TypoCorrection) { 1141 // The third "scope" argument is 0 since we aren't enabling lazy built-in 1142 // creation from this context. 1143 NamedDecl *IDecl = LookupSingleName(TUScope, Id, IdLoc, LookupOrdinaryName); 1144 1145 if (!IDecl && TypoCorrection) { 1146 // Perform typo correction at the given location, but only if we 1147 // find an Objective-C class name. 1148 LookupResult R(*this, Id, IdLoc, LookupOrdinaryName); 1149 if (CorrectTypo(R, TUScope, 0, 0, false, CTC_NoKeywords) && 1150 (IDecl = R.getAsSingle<ObjCInterfaceDecl>())) { 1151 Diag(IdLoc, diag::err_undef_interface_suggest) 1152 << Id << IDecl->getDeclName() 1153 << FixItHint::CreateReplacement(IdLoc, IDecl->getNameAsString()); 1154 Diag(IDecl->getLocation(), diag::note_previous_decl) 1155 << IDecl->getDeclName(); 1156 1157 Id = IDecl->getIdentifier(); 1158 } 1159 } 1160 1161 return dyn_cast_or_null<ObjCInterfaceDecl>(IDecl); 1162} 1163 1164/// getNonFieldDeclScope - Retrieves the innermost scope, starting 1165/// from S, where a non-field would be declared. This routine copes 1166/// with the difference between C and C++ scoping rules in structs and 1167/// unions. For example, the following code is well-formed in C but 1168/// ill-formed in C++: 1169/// @code 1170/// struct S6 { 1171/// enum { BAR } e; 1172/// }; 1173/// 1174/// void test_S6() { 1175/// struct S6 a; 1176/// a.e = BAR; 1177/// } 1178/// @endcode 1179/// For the declaration of BAR, this routine will return a different 1180/// scope. The scope S will be the scope of the unnamed enumeration 1181/// within S6. In C++, this routine will return the scope associated 1182/// with S6, because the enumeration's scope is a transparent 1183/// context but structures can contain non-field names. In C, this 1184/// routine will return the translation unit scope, since the 1185/// enumeration's scope is a transparent context and structures cannot 1186/// contain non-field names. 1187Scope *Sema::getNonFieldDeclScope(Scope *S) { 1188 while (((S->getFlags() & Scope::DeclScope) == 0) || 1189 (S->getEntity() && 1190 ((DeclContext *)S->getEntity())->isTransparentContext()) || 1191 (S->isClassScope() && !getLangOptions().CPlusPlus)) 1192 S = S->getParent(); 1193 return S; 1194} 1195 1196/// LazilyCreateBuiltin - The specified Builtin-ID was first used at 1197/// file scope. lazily create a decl for it. ForRedeclaration is true 1198/// if we're creating this built-in in anticipation of redeclaring the 1199/// built-in. 1200NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid, 1201 Scope *S, bool ForRedeclaration, 1202 SourceLocation Loc) { 1203 Builtin::ID BID = (Builtin::ID)bid; 1204 1205 ASTContext::GetBuiltinTypeError Error; 1206 QualType R = Context.GetBuiltinType(BID, Error); 1207 switch (Error) { 1208 case ASTContext::GE_None: 1209 // Okay 1210 break; 1211 1212 case ASTContext::GE_Missing_stdio: 1213 if (ForRedeclaration) 1214 Diag(Loc, diag::warn_implicit_decl_requires_stdio) 1215 << Context.BuiltinInfo.GetName(BID); 1216 return 0; 1217 1218 case ASTContext::GE_Missing_setjmp: 1219 if (ForRedeclaration) 1220 Diag(Loc, diag::warn_implicit_decl_requires_setjmp) 1221 << Context.BuiltinInfo.GetName(BID); 1222 return 0; 1223 } 1224 1225 if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) { 1226 Diag(Loc, diag::ext_implicit_lib_function_decl) 1227 << Context.BuiltinInfo.GetName(BID) 1228 << R; 1229 if (Context.BuiltinInfo.getHeaderName(BID) && 1230 Diags.getDiagnosticLevel(diag::ext_implicit_lib_function_decl, Loc) 1231 != Diagnostic::Ignored) 1232 Diag(Loc, diag::note_please_include_header) 1233 << Context.BuiltinInfo.getHeaderName(BID) 1234 << Context.BuiltinInfo.GetName(BID); 1235 } 1236 1237 FunctionDecl *New = FunctionDecl::Create(Context, 1238 Context.getTranslationUnitDecl(), 1239 Loc, Loc, II, R, /*TInfo=*/0, 1240 SC_Extern, 1241 SC_None, false, 1242 /*hasPrototype=*/true); 1243 New->setImplicit(); 1244 1245 // Create Decl objects for each parameter, adding them to the 1246 // FunctionDecl. 1247 if (const FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) { 1248 llvm::SmallVector<ParmVarDecl*, 16> Params; 1249 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) { 1250 ParmVarDecl *parm = 1251 ParmVarDecl::Create(Context, New, SourceLocation(), 1252 SourceLocation(), 0, 1253 FT->getArgType(i), /*TInfo=*/0, 1254 SC_None, SC_None, 0); 1255 parm->setScopeInfo(0, i); 1256 Params.push_back(parm); 1257 } 1258 New->setParams(Params.data(), Params.size()); 1259 } 1260 1261 AddKnownFunctionAttributes(New); 1262 1263 // TUScope is the translation-unit scope to insert this function into. 1264 // FIXME: This is hideous. We need to teach PushOnScopeChains to 1265 // relate Scopes to DeclContexts, and probably eliminate CurContext 1266 // entirely, but we're not there yet. 1267 DeclContext *SavedContext = CurContext; 1268 CurContext = Context.getTranslationUnitDecl(); 1269 PushOnScopeChains(New, TUScope); 1270 CurContext = SavedContext; 1271 return New; 1272} 1273 1274/// MergeTypedefNameDecl - We just parsed a typedef 'New' which has the 1275/// same name and scope as a previous declaration 'Old'. Figure out 1276/// how to resolve this situation, merging decls or emitting 1277/// diagnostics as appropriate. If there was an error, set New to be invalid. 1278/// 1279void Sema::MergeTypedefNameDecl(TypedefNameDecl *New, LookupResult &OldDecls) { 1280 // If the new decl is known invalid already, don't bother doing any 1281 // merging checks. 1282 if (New->isInvalidDecl()) return; 1283 1284 // Allow multiple definitions for ObjC built-in typedefs. 1285 // FIXME: Verify the underlying types are equivalent! 1286 if (getLangOptions().ObjC1) { 1287 const IdentifierInfo *TypeID = New->getIdentifier(); 1288 switch (TypeID->getLength()) { 1289 default: break; 1290 case 2: 1291 if (!TypeID->isStr("id")) 1292 break; 1293 Context.ObjCIdRedefinitionType = New->getUnderlyingType(); 1294 // Install the built-in type for 'id', ignoring the current definition. 1295 New->setTypeForDecl(Context.getObjCIdType().getTypePtr()); 1296 return; 1297 case 5: 1298 if (!TypeID->isStr("Class")) 1299 break; 1300 Context.ObjCClassRedefinitionType = New->getUnderlyingType(); 1301 // Install the built-in type for 'Class', ignoring the current definition. 1302 New->setTypeForDecl(Context.getObjCClassType().getTypePtr()); 1303 return; 1304 case 3: 1305 if (!TypeID->isStr("SEL")) 1306 break; 1307 Context.ObjCSelRedefinitionType = New->getUnderlyingType(); 1308 // Install the built-in type for 'SEL', ignoring the current definition. 1309 New->setTypeForDecl(Context.getObjCSelType().getTypePtr()); 1310 return; 1311 case 8: 1312 if (!TypeID->isStr("Protocol")) 1313 break; 1314 Context.setObjCProtoType(New->getUnderlyingType()); 1315 return; 1316 } 1317 // Fall through - the typedef name was not a builtin type. 1318 } 1319 1320 // Verify the old decl was also a type. 1321 TypeDecl *Old = OldDecls.getAsSingle<TypeDecl>(); 1322 if (!Old) { 1323 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1324 << New->getDeclName(); 1325 1326 NamedDecl *OldD = OldDecls.getRepresentativeDecl(); 1327 if (OldD->getLocation().isValid()) 1328 Diag(OldD->getLocation(), diag::note_previous_definition); 1329 1330 return New->setInvalidDecl(); 1331 } 1332 1333 // If the old declaration is invalid, just give up here. 1334 if (Old->isInvalidDecl()) 1335 return New->setInvalidDecl(); 1336 1337 // Determine the "old" type we'll use for checking and diagnostics. 1338 QualType OldType; 1339 if (TypedefNameDecl *OldTypedef = dyn_cast<TypedefNameDecl>(Old)) 1340 OldType = OldTypedef->getUnderlyingType(); 1341 else 1342 OldType = Context.getTypeDeclType(Old); 1343 1344 // If the typedef types are not identical, reject them in all languages and 1345 // with any extensions enabled. 1346 1347 if (OldType != New->getUnderlyingType() && 1348 Context.getCanonicalType(OldType) != 1349 Context.getCanonicalType(New->getUnderlyingType())) { 1350 int Kind = 0; 1351 if (isa<TypeAliasDecl>(Old)) 1352 Kind = 1; 1353 Diag(New->getLocation(), diag::err_redefinition_different_typedef) 1354 << Kind << New->getUnderlyingType() << OldType; 1355 if (Old->getLocation().isValid()) 1356 Diag(Old->getLocation(), diag::note_previous_definition); 1357 return New->setInvalidDecl(); 1358 } 1359 1360 // The types match. Link up the redeclaration chain if the old 1361 // declaration was a typedef. 1362 // FIXME: this is a potential source of wierdness if the type 1363 // spellings don't match exactly. 1364 if (TypedefNameDecl *Typedef = dyn_cast<TypedefNameDecl>(Old)) 1365 New->setPreviousDeclaration(Typedef); 1366 1367 if (getLangOptions().Microsoft) 1368 return; 1369 1370 if (getLangOptions().CPlusPlus) { 1371 // C++ [dcl.typedef]p2: 1372 // In a given non-class scope, a typedef specifier can be used to 1373 // redefine the name of any type declared in that scope to refer 1374 // to the type to which it already refers. 1375 if (!isa<CXXRecordDecl>(CurContext)) 1376 return; 1377 1378 // C++0x [dcl.typedef]p4: 1379 // In a given class scope, a typedef specifier can be used to redefine 1380 // any class-name declared in that scope that is not also a typedef-name 1381 // to refer to the type to which it already refers. 1382 // 1383 // This wording came in via DR424, which was a correction to the 1384 // wording in DR56, which accidentally banned code like: 1385 // 1386 // struct S { 1387 // typedef struct A { } A; 1388 // }; 1389 // 1390 // in the C++03 standard. We implement the C++0x semantics, which 1391 // allow the above but disallow 1392 // 1393 // struct S { 1394 // typedef int I; 1395 // typedef int I; 1396 // }; 1397 // 1398 // since that was the intent of DR56. 1399 if (!isa<TypedefNameDecl>(Old)) 1400 return; 1401 1402 Diag(New->getLocation(), diag::err_redefinition) 1403 << New->getDeclName(); 1404 Diag(Old->getLocation(), diag::note_previous_definition); 1405 return New->setInvalidDecl(); 1406 } 1407 1408 // If we have a redefinition of a typedef in C, emit a warning. This warning 1409 // is normally mapped to an error, but can be controlled with 1410 // -Wtypedef-redefinition. If either the original or the redefinition is 1411 // in a system header, don't emit this for compatibility with GCC. 1412 if (getDiagnostics().getSuppressSystemWarnings() && 1413 (Context.getSourceManager().isInSystemHeader(Old->getLocation()) || 1414 Context.getSourceManager().isInSystemHeader(New->getLocation()))) 1415 return; 1416 1417 Diag(New->getLocation(), diag::warn_redefinition_of_typedef) 1418 << New->getDeclName(); 1419 Diag(Old->getLocation(), diag::note_previous_definition); 1420 return; 1421} 1422 1423/// DeclhasAttr - returns true if decl Declaration already has the target 1424/// attribute. 1425static bool 1426DeclHasAttr(const Decl *D, const Attr *A) { 1427 const OwnershipAttr *OA = dyn_cast<OwnershipAttr>(A); 1428 for (Decl::attr_iterator i = D->attr_begin(), e = D->attr_end(); i != e; ++i) 1429 if ((*i)->getKind() == A->getKind()) { 1430 // FIXME: Don't hardcode this check 1431 if (OA && isa<OwnershipAttr>(*i)) 1432 return OA->getOwnKind() == cast<OwnershipAttr>(*i)->getOwnKind(); 1433 return true; 1434 } 1435 1436 return false; 1437} 1438 1439/// mergeDeclAttributes - Copy attributes from the Old decl to the New one. 1440static void mergeDeclAttributes(Decl *newDecl, const Decl *oldDecl, 1441 ASTContext &C) { 1442 if (!oldDecl->hasAttrs()) 1443 return; 1444 1445 bool foundAny = newDecl->hasAttrs(); 1446 1447 // Ensure that any moving of objects within the allocated map is done before 1448 // we process them. 1449 if (!foundAny) newDecl->setAttrs(AttrVec()); 1450 1451 for (specific_attr_iterator<InheritableAttr> 1452 i = oldDecl->specific_attr_begin<InheritableAttr>(), 1453 e = oldDecl->specific_attr_end<InheritableAttr>(); i != e; ++i) { 1454 if (!DeclHasAttr(newDecl, *i)) { 1455 InheritableAttr *newAttr = cast<InheritableAttr>((*i)->clone(C)); 1456 newAttr->setInherited(true); 1457 newDecl->addAttr(newAttr); 1458 foundAny = true; 1459 } 1460 } 1461 1462 if (!foundAny) newDecl->dropAttrs(); 1463} 1464 1465/// mergeParamDeclAttributes - Copy attributes from the old parameter 1466/// to the new one. 1467static void mergeParamDeclAttributes(ParmVarDecl *newDecl, 1468 const ParmVarDecl *oldDecl, 1469 ASTContext &C) { 1470 if (!oldDecl->hasAttrs()) 1471 return; 1472 1473 bool foundAny = newDecl->hasAttrs(); 1474 1475 // Ensure that any moving of objects within the allocated map is 1476 // done before we process them. 1477 if (!foundAny) newDecl->setAttrs(AttrVec()); 1478 1479 for (specific_attr_iterator<InheritableParamAttr> 1480 i = oldDecl->specific_attr_begin<InheritableParamAttr>(), 1481 e = oldDecl->specific_attr_end<InheritableParamAttr>(); i != e; ++i) { 1482 if (!DeclHasAttr(newDecl, *i)) { 1483 InheritableAttr *newAttr = cast<InheritableParamAttr>((*i)->clone(C)); 1484 newAttr->setInherited(true); 1485 newDecl->addAttr(newAttr); 1486 foundAny = true; 1487 } 1488 } 1489 1490 if (!foundAny) newDecl->dropAttrs(); 1491} 1492 1493namespace { 1494 1495/// Used in MergeFunctionDecl to keep track of function parameters in 1496/// C. 1497struct GNUCompatibleParamWarning { 1498 ParmVarDecl *OldParm; 1499 ParmVarDecl *NewParm; 1500 QualType PromotedType; 1501}; 1502 1503} 1504 1505/// getSpecialMember - get the special member enum for a method. 1506Sema::CXXSpecialMember Sema::getSpecialMember(const CXXMethodDecl *MD) { 1507 if (const CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(MD)) { 1508 if (Ctor->isDefaultConstructor()) 1509 return Sema::CXXDefaultConstructor; 1510 1511 if (Ctor->isCopyConstructor()) 1512 return Sema::CXXCopyConstructor; 1513 1514 if (Ctor->isMoveConstructor()) 1515 return Sema::CXXMoveConstructor; 1516 } else if (isa<CXXDestructorDecl>(MD)) { 1517 return Sema::CXXDestructor; 1518 } else if (MD->isCopyAssignmentOperator()) { 1519 return Sema::CXXCopyAssignment; 1520 } 1521 1522 return Sema::CXXInvalid; 1523} 1524 1525/// canRedefineFunction - checks if a function can be redefined. Currently, 1526/// only extern inline functions can be redefined, and even then only in 1527/// GNU89 mode. 1528static bool canRedefineFunction(const FunctionDecl *FD, 1529 const LangOptions& LangOpts) { 1530 return (LangOpts.GNUInline && !LangOpts.CPlusPlus && 1531 FD->isInlineSpecified() && 1532 FD->getStorageClass() == SC_Extern); 1533} 1534 1535/// MergeFunctionDecl - We just parsed a function 'New' from 1536/// declarator D which has the same name and scope as a previous 1537/// declaration 'Old'. Figure out how to resolve this situation, 1538/// merging decls or emitting diagnostics as appropriate. 1539/// 1540/// In C++, New and Old must be declarations that are not 1541/// overloaded. Use IsOverload to determine whether New and Old are 1542/// overloaded, and to select the Old declaration that New should be 1543/// merged with. 1544/// 1545/// Returns true if there was an error, false otherwise. 1546bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD) { 1547 // Verify the old decl was also a function. 1548 FunctionDecl *Old = 0; 1549 if (FunctionTemplateDecl *OldFunctionTemplate 1550 = dyn_cast<FunctionTemplateDecl>(OldD)) 1551 Old = OldFunctionTemplate->getTemplatedDecl(); 1552 else 1553 Old = dyn_cast<FunctionDecl>(OldD); 1554 if (!Old) { 1555 if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(OldD)) { 1556 Diag(New->getLocation(), diag::err_using_decl_conflict_reverse); 1557 Diag(Shadow->getTargetDecl()->getLocation(), 1558 diag::note_using_decl_target); 1559 Diag(Shadow->getUsingDecl()->getLocation(), 1560 diag::note_using_decl) << 0; 1561 return true; 1562 } 1563 1564 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1565 << New->getDeclName(); 1566 Diag(OldD->getLocation(), diag::note_previous_definition); 1567 return true; 1568 } 1569 1570 // Determine whether the previous declaration was a definition, 1571 // implicit declaration, or a declaration. 1572 diag::kind PrevDiag; 1573 if (Old->isThisDeclarationADefinition()) 1574 PrevDiag = diag::note_previous_definition; 1575 else if (Old->isImplicit()) 1576 PrevDiag = diag::note_previous_implicit_declaration; 1577 else 1578 PrevDiag = diag::note_previous_declaration; 1579 1580 QualType OldQType = Context.getCanonicalType(Old->getType()); 1581 QualType NewQType = Context.getCanonicalType(New->getType()); 1582 1583 // Don't complain about this if we're in GNU89 mode and the old function 1584 // is an extern inline function. 1585 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) && 1586 New->getStorageClass() == SC_Static && 1587 Old->getStorageClass() != SC_Static && 1588 !canRedefineFunction(Old, getLangOptions())) { 1589 if (getLangOptions().Microsoft) { 1590 Diag(New->getLocation(), diag::warn_static_non_static) << New; 1591 Diag(Old->getLocation(), PrevDiag); 1592 } else { 1593 Diag(New->getLocation(), diag::err_static_non_static) << New; 1594 Diag(Old->getLocation(), PrevDiag); 1595 return true; 1596 } 1597 } 1598 1599 // If a function is first declared with a calling convention, but is 1600 // later declared or defined without one, the second decl assumes the 1601 // calling convention of the first. 1602 // 1603 // For the new decl, we have to look at the NON-canonical type to tell the 1604 // difference between a function that really doesn't have a calling 1605 // convention and one that is declared cdecl. That's because in 1606 // canonicalization (see ASTContext.cpp), cdecl is canonicalized away 1607 // because it is the default calling convention. 1608 // 1609 // Note also that we DO NOT return at this point, because we still have 1610 // other tests to run. 1611 const FunctionType *OldType = cast<FunctionType>(OldQType); 1612 const FunctionType *NewType = New->getType()->getAs<FunctionType>(); 1613 FunctionType::ExtInfo OldTypeInfo = OldType->getExtInfo(); 1614 FunctionType::ExtInfo NewTypeInfo = NewType->getExtInfo(); 1615 bool RequiresAdjustment = false; 1616 if (OldTypeInfo.getCC() != CC_Default && 1617 NewTypeInfo.getCC() == CC_Default) { 1618 NewTypeInfo = NewTypeInfo.withCallingConv(OldTypeInfo.getCC()); 1619 RequiresAdjustment = true; 1620 } else if (!Context.isSameCallConv(OldTypeInfo.getCC(), 1621 NewTypeInfo.getCC())) { 1622 // Calling conventions really aren't compatible, so complain. 1623 Diag(New->getLocation(), diag::err_cconv_change) 1624 << FunctionType::getNameForCallConv(NewTypeInfo.getCC()) 1625 << (OldTypeInfo.getCC() == CC_Default) 1626 << (OldTypeInfo.getCC() == CC_Default ? "" : 1627 FunctionType::getNameForCallConv(OldTypeInfo.getCC())); 1628 Diag(Old->getLocation(), diag::note_previous_declaration); 1629 return true; 1630 } 1631 1632 // FIXME: diagnose the other way around? 1633 if (OldTypeInfo.getNoReturn() && !NewTypeInfo.getNoReturn()) { 1634 NewTypeInfo = NewTypeInfo.withNoReturn(true); 1635 RequiresAdjustment = true; 1636 } 1637 1638 // Merge regparm attribute. 1639 if (OldTypeInfo.getHasRegParm() != NewTypeInfo.getHasRegParm() || 1640 OldTypeInfo.getRegParm() != NewTypeInfo.getRegParm()) { 1641 if (NewTypeInfo.getHasRegParm()) { 1642 Diag(New->getLocation(), diag::err_regparm_mismatch) 1643 << NewType->getRegParmType() 1644 << OldType->getRegParmType(); 1645 Diag(Old->getLocation(), diag::note_previous_declaration); 1646 return true; 1647 } 1648 1649 NewTypeInfo = NewTypeInfo.withRegParm(OldTypeInfo.getRegParm()); 1650 RequiresAdjustment = true; 1651 } 1652 1653 if (RequiresAdjustment) { 1654 NewType = Context.adjustFunctionType(NewType, NewTypeInfo); 1655 New->setType(QualType(NewType, 0)); 1656 NewQType = Context.getCanonicalType(New->getType()); 1657 } 1658 1659 if (getLangOptions().CPlusPlus) { 1660 // (C++98 13.1p2): 1661 // Certain function declarations cannot be overloaded: 1662 // -- Function declarations that differ only in the return type 1663 // cannot be overloaded. 1664 QualType OldReturnType = OldType->getResultType(); 1665 QualType NewReturnType = cast<FunctionType>(NewQType)->getResultType(); 1666 QualType ResQT; 1667 if (OldReturnType != NewReturnType) { 1668 if (NewReturnType->isObjCObjectPointerType() 1669 && OldReturnType->isObjCObjectPointerType()) 1670 ResQT = Context.mergeObjCGCQualifiers(NewQType, OldQType); 1671 if (ResQT.isNull()) { 1672 if (New->isCXXClassMember() && New->isOutOfLine()) 1673 Diag(New->getLocation(), 1674 diag::err_member_def_does_not_match_ret_type) << New; 1675 else 1676 Diag(New->getLocation(), diag::err_ovl_diff_return_type); 1677 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1678 return true; 1679 } 1680 else 1681 NewQType = ResQT; 1682 } 1683 1684 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 1685 CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 1686 if (OldMethod && NewMethod) { 1687 // Preserve triviality. 1688 NewMethod->setTrivial(OldMethod->isTrivial()); 1689 1690 bool isFriend = NewMethod->getFriendObjectKind(); 1691 1692 if (!isFriend && NewMethod->getLexicalDeclContext()->isRecord()) { 1693 // -- Member function declarations with the same name and the 1694 // same parameter types cannot be overloaded if any of them 1695 // is a static member function declaration. 1696 if (OldMethod->isStatic() || NewMethod->isStatic()) { 1697 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 1698 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1699 return true; 1700 } 1701 1702 // C++ [class.mem]p1: 1703 // [...] A member shall not be declared twice in the 1704 // member-specification, except that a nested class or member 1705 // class template can be declared and then later defined. 1706 unsigned NewDiag; 1707 if (isa<CXXConstructorDecl>(OldMethod)) 1708 NewDiag = diag::err_constructor_redeclared; 1709 else if (isa<CXXDestructorDecl>(NewMethod)) 1710 NewDiag = diag::err_destructor_redeclared; 1711 else if (isa<CXXConversionDecl>(NewMethod)) 1712 NewDiag = diag::err_conv_function_redeclared; 1713 else 1714 NewDiag = diag::err_member_redeclared; 1715 1716 Diag(New->getLocation(), NewDiag); 1717 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1718 1719 // Complain if this is an explicit declaration of a special 1720 // member that was initially declared implicitly. 1721 // 1722 // As an exception, it's okay to befriend such methods in order 1723 // to permit the implicit constructor/destructor/operator calls. 1724 } else if (OldMethod->isImplicit()) { 1725 if (isFriend) { 1726 NewMethod->setImplicit(); 1727 } else { 1728 Diag(NewMethod->getLocation(), 1729 diag::err_definition_of_implicitly_declared_member) 1730 << New << getSpecialMember(OldMethod); 1731 return true; 1732 } 1733 } else if (OldMethod->isExplicitlyDefaulted()) { 1734 Diag(NewMethod->getLocation(), 1735 diag::err_definition_of_explicitly_defaulted_member) 1736 << getSpecialMember(OldMethod); 1737 return true; 1738 } 1739 } 1740 1741 // (C++98 8.3.5p3): 1742 // All declarations for a function shall agree exactly in both the 1743 // return type and the parameter-type-list. 1744 // We also want to respect all the extended bits except noreturn. 1745 1746 // noreturn should now match unless the old type info didn't have it. 1747 QualType OldQTypeForComparison = OldQType; 1748 if (!OldTypeInfo.getNoReturn() && NewTypeInfo.getNoReturn()) { 1749 assert(OldQType == QualType(OldType, 0)); 1750 const FunctionType *OldTypeForComparison 1751 = Context.adjustFunctionType(OldType, OldTypeInfo.withNoReturn(true)); 1752 OldQTypeForComparison = QualType(OldTypeForComparison, 0); 1753 assert(OldQTypeForComparison.isCanonical()); 1754 } 1755 1756 if (OldQTypeForComparison == NewQType) 1757 return MergeCompatibleFunctionDecls(New, Old); 1758 1759 // Fall through for conflicting redeclarations and redefinitions. 1760 } 1761 1762 // C: Function types need to be compatible, not identical. This handles 1763 // duplicate function decls like "void f(int); void f(enum X);" properly. 1764 if (!getLangOptions().CPlusPlus && 1765 Context.typesAreCompatible(OldQType, NewQType)) { 1766 const FunctionType *OldFuncType = OldQType->getAs<FunctionType>(); 1767 const FunctionType *NewFuncType = NewQType->getAs<FunctionType>(); 1768 const FunctionProtoType *OldProto = 0; 1769 if (isa<FunctionNoProtoType>(NewFuncType) && 1770 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) { 1771 // The old declaration provided a function prototype, but the 1772 // new declaration does not. Merge in the prototype. 1773 assert(!OldProto->hasExceptionSpec() && "Exception spec in C"); 1774 llvm::SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(), 1775 OldProto->arg_type_end()); 1776 NewQType = Context.getFunctionType(NewFuncType->getResultType(), 1777 ParamTypes.data(), ParamTypes.size(), 1778 OldProto->getExtProtoInfo()); 1779 New->setType(NewQType); 1780 New->setHasInheritedPrototype(); 1781 1782 // Synthesize a parameter for each argument type. 1783 llvm::SmallVector<ParmVarDecl*, 16> Params; 1784 for (FunctionProtoType::arg_type_iterator 1785 ParamType = OldProto->arg_type_begin(), 1786 ParamEnd = OldProto->arg_type_end(); 1787 ParamType != ParamEnd; ++ParamType) { 1788 ParmVarDecl *Param = ParmVarDecl::Create(Context, New, 1789 SourceLocation(), 1790 SourceLocation(), 0, 1791 *ParamType, /*TInfo=*/0, 1792 SC_None, SC_None, 1793 0); 1794 Param->setScopeInfo(0, Params.size()); 1795 Param->setImplicit(); 1796 Params.push_back(Param); 1797 } 1798 1799 New->setParams(Params.data(), Params.size()); 1800 } 1801 1802 return MergeCompatibleFunctionDecls(New, Old); 1803 } 1804 1805 // GNU C permits a K&R definition to follow a prototype declaration 1806 // if the declared types of the parameters in the K&R definition 1807 // match the types in the prototype declaration, even when the 1808 // promoted types of the parameters from the K&R definition differ 1809 // from the types in the prototype. GCC then keeps the types from 1810 // the prototype. 1811 // 1812 // If a variadic prototype is followed by a non-variadic K&R definition, 1813 // the K&R definition becomes variadic. This is sort of an edge case, but 1814 // it's legal per the standard depending on how you read C99 6.7.5.3p15 and 1815 // C99 6.9.1p8. 1816 if (!getLangOptions().CPlusPlus && 1817 Old->hasPrototype() && !New->hasPrototype() && 1818 New->getType()->getAs<FunctionProtoType>() && 1819 Old->getNumParams() == New->getNumParams()) { 1820 llvm::SmallVector<QualType, 16> ArgTypes; 1821 llvm::SmallVector<GNUCompatibleParamWarning, 16> Warnings; 1822 const FunctionProtoType *OldProto 1823 = Old->getType()->getAs<FunctionProtoType>(); 1824 const FunctionProtoType *NewProto 1825 = New->getType()->getAs<FunctionProtoType>(); 1826 1827 // Determine whether this is the GNU C extension. 1828 QualType MergedReturn = Context.mergeTypes(OldProto->getResultType(), 1829 NewProto->getResultType()); 1830 bool LooseCompatible = !MergedReturn.isNull(); 1831 for (unsigned Idx = 0, End = Old->getNumParams(); 1832 LooseCompatible && Idx != End; ++Idx) { 1833 ParmVarDecl *OldParm = Old->getParamDecl(Idx); 1834 ParmVarDecl *NewParm = New->getParamDecl(Idx); 1835 if (Context.typesAreCompatible(OldParm->getType(), 1836 NewProto->getArgType(Idx))) { 1837 ArgTypes.push_back(NewParm->getType()); 1838 } else if (Context.typesAreCompatible(OldParm->getType(), 1839 NewParm->getType(), 1840 /*CompareUnqualified=*/true)) { 1841 GNUCompatibleParamWarning Warn 1842 = { OldParm, NewParm, NewProto->getArgType(Idx) }; 1843 Warnings.push_back(Warn); 1844 ArgTypes.push_back(NewParm->getType()); 1845 } else 1846 LooseCompatible = false; 1847 } 1848 1849 if (LooseCompatible) { 1850 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) { 1851 Diag(Warnings[Warn].NewParm->getLocation(), 1852 diag::ext_param_promoted_not_compatible_with_prototype) 1853 << Warnings[Warn].PromotedType 1854 << Warnings[Warn].OldParm->getType(); 1855 if (Warnings[Warn].OldParm->getLocation().isValid()) 1856 Diag(Warnings[Warn].OldParm->getLocation(), 1857 diag::note_previous_declaration); 1858 } 1859 1860 New->setType(Context.getFunctionType(MergedReturn, &ArgTypes[0], 1861 ArgTypes.size(), 1862 OldProto->getExtProtoInfo())); 1863 return MergeCompatibleFunctionDecls(New, Old); 1864 } 1865 1866 // Fall through to diagnose conflicting types. 1867 } 1868 1869 // A function that has already been declared has been redeclared or defined 1870 // with a different type- show appropriate diagnostic 1871 if (unsigned BuiltinID = Old->getBuiltinID()) { 1872 // The user has declared a builtin function with an incompatible 1873 // signature. 1874 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 1875 // The function the user is redeclaring is a library-defined 1876 // function like 'malloc' or 'printf'. Warn about the 1877 // redeclaration, then pretend that we don't know about this 1878 // library built-in. 1879 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; 1880 Diag(Old->getLocation(), diag::note_previous_builtin_declaration) 1881 << Old << Old->getType(); 1882 New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin); 1883 Old->setInvalidDecl(); 1884 return false; 1885 } 1886 1887 PrevDiag = diag::note_previous_builtin_declaration; 1888 } 1889 1890 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 1891 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1892 return true; 1893} 1894 1895/// \brief Completes the merge of two function declarations that are 1896/// known to be compatible. 1897/// 1898/// This routine handles the merging of attributes and other 1899/// properties of function declarations form the old declaration to 1900/// the new declaration, once we know that New is in fact a 1901/// redeclaration of Old. 1902/// 1903/// \returns false 1904bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old) { 1905 // Merge the attributes 1906 mergeDeclAttributes(New, Old, Context); 1907 1908 // Merge the storage class. 1909 if (Old->getStorageClass() != SC_Extern && 1910 Old->getStorageClass() != SC_None) 1911 New->setStorageClass(Old->getStorageClass()); 1912 1913 // Merge "pure" flag. 1914 if (Old->isPure()) 1915 New->setPure(); 1916 1917 // Merge attributes from the parameters. These can mismatch with K&R 1918 // declarations. 1919 if (New->getNumParams() == Old->getNumParams()) 1920 for (unsigned i = 0, e = New->getNumParams(); i != e; ++i) 1921 mergeParamDeclAttributes(New->getParamDecl(i), Old->getParamDecl(i), 1922 Context); 1923 1924 if (getLangOptions().CPlusPlus) 1925 return MergeCXXFunctionDecl(New, Old); 1926 1927 return false; 1928} 1929 1930void Sema::mergeObjCMethodDecls(ObjCMethodDecl *newMethod, 1931 const ObjCMethodDecl *oldMethod) { 1932 // Merge the attributes. 1933 mergeDeclAttributes(newMethod, oldMethod, Context); 1934 1935 // Merge attributes from the parameters. 1936 for (ObjCMethodDecl::param_iterator oi = oldMethod->param_begin(), 1937 ni = newMethod->param_begin(), ne = newMethod->param_end(); 1938 ni != ne; ++ni, ++oi) 1939 mergeParamDeclAttributes(*ni, *oi, Context); 1940} 1941 1942/// MergeVarDeclTypes - We parsed a variable 'New' which has the same name and 1943/// scope as a previous declaration 'Old'. Figure out how to merge their types, 1944/// emitting diagnostics as appropriate. 1945/// 1946/// Declarations using the auto type specifier (C++ [decl.spec.auto]) call back 1947/// to here in AddInitializerToDecl and AddCXXDirectInitializerToDecl. We can't 1948/// check them before the initializer is attached. 1949/// 1950void Sema::MergeVarDeclTypes(VarDecl *New, VarDecl *Old) { 1951 if (New->isInvalidDecl() || Old->isInvalidDecl()) 1952 return; 1953 1954 QualType MergedT; 1955 if (getLangOptions().CPlusPlus) { 1956 AutoType *AT = New->getType()->getContainedAutoType(); 1957 if (AT && !AT->isDeduced()) { 1958 // We don't know what the new type is until the initializer is attached. 1959 return; 1960 } else if (Context.hasSameType(New->getType(), Old->getType())) { 1961 // These could still be something that needs exception specs checked. 1962 return MergeVarDeclExceptionSpecs(New, Old); 1963 } 1964 // C++ [basic.link]p10: 1965 // [...] the types specified by all declarations referring to a given 1966 // object or function shall be identical, except that declarations for an 1967 // array object can specify array types that differ by the presence or 1968 // absence of a major array bound (8.3.4). 1969 else if (Old->getType()->isIncompleteArrayType() && 1970 New->getType()->isArrayType()) { 1971 CanQual<ArrayType> OldArray 1972 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 1973 CanQual<ArrayType> NewArray 1974 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 1975 if (OldArray->getElementType() == NewArray->getElementType()) 1976 MergedT = New->getType(); 1977 } else if (Old->getType()->isArrayType() && 1978 New->getType()->isIncompleteArrayType()) { 1979 CanQual<ArrayType> OldArray 1980 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 1981 CanQual<ArrayType> NewArray 1982 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 1983 if (OldArray->getElementType() == NewArray->getElementType()) 1984 MergedT = Old->getType(); 1985 } else if (New->getType()->isObjCObjectPointerType() 1986 && Old->getType()->isObjCObjectPointerType()) { 1987 MergedT = Context.mergeObjCGCQualifiers(New->getType(), 1988 Old->getType()); 1989 } 1990 } else { 1991 MergedT = Context.mergeTypes(New->getType(), Old->getType()); 1992 } 1993 if (MergedT.isNull()) { 1994 Diag(New->getLocation(), diag::err_redefinition_different_type) 1995 << New->getDeclName(); 1996 Diag(Old->getLocation(), diag::note_previous_definition); 1997 return New->setInvalidDecl(); 1998 } 1999 New->setType(MergedT); 2000} 2001 2002/// MergeVarDecl - We just parsed a variable 'New' which has the same name 2003/// and scope as a previous declaration 'Old'. Figure out how to resolve this 2004/// situation, merging decls or emitting diagnostics as appropriate. 2005/// 2006/// Tentative definition rules (C99 6.9.2p2) are checked by 2007/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 2008/// definitions here, since the initializer hasn't been attached. 2009/// 2010void Sema::MergeVarDecl(VarDecl *New, LookupResult &Previous) { 2011 // If the new decl is already invalid, don't do any other checking. 2012 if (New->isInvalidDecl()) 2013 return; 2014 2015 // Verify the old decl was also a variable. 2016 VarDecl *Old = 0; 2017 if (!Previous.isSingleResult() || 2018 !(Old = dyn_cast<VarDecl>(Previous.getFoundDecl()))) { 2019 Diag(New->getLocation(), diag::err_redefinition_different_kind) 2020 << New->getDeclName(); 2021 Diag(Previous.getRepresentativeDecl()->getLocation(), 2022 diag::note_previous_definition); 2023 return New->setInvalidDecl(); 2024 } 2025 2026 // C++ [class.mem]p1: 2027 // A member shall not be declared twice in the member-specification [...] 2028 // 2029 // Here, we need only consider static data members. 2030 if (Old->isStaticDataMember() && !New->isOutOfLine()) { 2031 Diag(New->getLocation(), diag::err_duplicate_member) 2032 << New->getIdentifier(); 2033 Diag(Old->getLocation(), diag::note_previous_declaration); 2034 New->setInvalidDecl(); 2035 } 2036 2037 mergeDeclAttributes(New, Old, Context); 2038 2039 // Merge the types. 2040 MergeVarDeclTypes(New, Old); 2041 if (New->isInvalidDecl()) 2042 return; 2043 2044 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 2045 if (New->getStorageClass() == SC_Static && 2046 (Old->getStorageClass() == SC_None || Old->hasExternalStorage())) { 2047 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 2048 Diag(Old->getLocation(), diag::note_previous_definition); 2049 return New->setInvalidDecl(); 2050 } 2051 // C99 6.2.2p4: 2052 // For an identifier declared with the storage-class specifier 2053 // extern in a scope in which a prior declaration of that 2054 // identifier is visible,23) if the prior declaration specifies 2055 // internal or external linkage, the linkage of the identifier at 2056 // the later declaration is the same as the linkage specified at 2057 // the prior declaration. If no prior declaration is visible, or 2058 // if the prior declaration specifies no linkage, then the 2059 // identifier has external linkage. 2060 if (New->hasExternalStorage() && Old->hasLinkage()) 2061 /* Okay */; 2062 else if (New->getStorageClass() != SC_Static && 2063 Old->getStorageClass() == SC_Static) { 2064 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 2065 Diag(Old->getLocation(), diag::note_previous_definition); 2066 return New->setInvalidDecl(); 2067 } 2068 2069 // Check if extern is followed by non-extern and vice-versa. 2070 if (New->hasExternalStorage() && 2071 !Old->hasLinkage() && Old->isLocalVarDecl()) { 2072 Diag(New->getLocation(), diag::err_extern_non_extern) << New->getDeclName(); 2073 Diag(Old->getLocation(), diag::note_previous_definition); 2074 return New->setInvalidDecl(); 2075 } 2076 if (Old->hasExternalStorage() && 2077 !New->hasLinkage() && New->isLocalVarDecl()) { 2078 Diag(New->getLocation(), diag::err_non_extern_extern) << New->getDeclName(); 2079 Diag(Old->getLocation(), diag::note_previous_definition); 2080 return New->setInvalidDecl(); 2081 } 2082 2083 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 2084 2085 // FIXME: The test for external storage here seems wrong? We still 2086 // need to check for mismatches. 2087 if (!New->hasExternalStorage() && !New->isFileVarDecl() && 2088 // Don't complain about out-of-line definitions of static members. 2089 !(Old->getLexicalDeclContext()->isRecord() && 2090 !New->getLexicalDeclContext()->isRecord())) { 2091 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 2092 Diag(Old->getLocation(), diag::note_previous_definition); 2093 return New->setInvalidDecl(); 2094 } 2095 2096 if (New->isThreadSpecified() && !Old->isThreadSpecified()) { 2097 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName(); 2098 Diag(Old->getLocation(), diag::note_previous_definition); 2099 } else if (!New->isThreadSpecified() && Old->isThreadSpecified()) { 2100 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName(); 2101 Diag(Old->getLocation(), diag::note_previous_definition); 2102 } 2103 2104 // C++ doesn't have tentative definitions, so go right ahead and check here. 2105 const VarDecl *Def; 2106 if (getLangOptions().CPlusPlus && 2107 New->isThisDeclarationADefinition() == VarDecl::Definition && 2108 (Def = Old->getDefinition())) { 2109 Diag(New->getLocation(), diag::err_redefinition) 2110 << New->getDeclName(); 2111 Diag(Def->getLocation(), diag::note_previous_definition); 2112 New->setInvalidDecl(); 2113 return; 2114 } 2115 // c99 6.2.2 P4. 2116 // For an identifier declared with the storage-class specifier extern in a 2117 // scope in which a prior declaration of that identifier is visible, if 2118 // the prior declaration specifies internal or external linkage, the linkage 2119 // of the identifier at the later declaration is the same as the linkage 2120 // specified at the prior declaration. 2121 // FIXME. revisit this code. 2122 if (New->hasExternalStorage() && 2123 Old->getLinkage() == InternalLinkage && 2124 New->getDeclContext() == Old->getDeclContext()) 2125 New->setStorageClass(Old->getStorageClass()); 2126 2127 // Keep a chain of previous declarations. 2128 New->setPreviousDeclaration(Old); 2129 2130 // Inherit access appropriately. 2131 New->setAccess(Old->getAccess()); 2132} 2133 2134/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2135/// no declarator (e.g. "struct foo;") is parsed. 2136Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2137 DeclSpec &DS) { 2138 return ParsedFreeStandingDeclSpec(S, AS, DS, 2139 MultiTemplateParamsArg(*this, 0, 0)); 2140} 2141 2142/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2143/// no declarator (e.g. "struct foo;") is parsed. It also accopts template 2144/// parameters to cope with template friend declarations. 2145Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2146 DeclSpec &DS, 2147 MultiTemplateParamsArg TemplateParams) { 2148 Decl *TagD = 0; 2149 TagDecl *Tag = 0; 2150 if (DS.getTypeSpecType() == DeclSpec::TST_class || 2151 DS.getTypeSpecType() == DeclSpec::TST_struct || 2152 DS.getTypeSpecType() == DeclSpec::TST_union || 2153 DS.getTypeSpecType() == DeclSpec::TST_enum) { 2154 TagD = DS.getRepAsDecl(); 2155 2156 if (!TagD) // We probably had an error 2157 return 0; 2158 2159 // Note that the above type specs guarantee that the 2160 // type rep is a Decl, whereas in many of the others 2161 // it's a Type. 2162 Tag = dyn_cast<TagDecl>(TagD); 2163 } 2164 2165 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 2166 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 2167 // or incomplete types shall not be restrict-qualified." 2168 if (TypeQuals & DeclSpec::TQ_restrict) 2169 Diag(DS.getRestrictSpecLoc(), 2170 diag::err_typecheck_invalid_restrict_not_pointer_noarg) 2171 << DS.getSourceRange(); 2172 } 2173 2174 if (DS.isFriendSpecified()) { 2175 // If we're dealing with a decl but not a TagDecl, assume that 2176 // whatever routines created it handled the friendship aspect. 2177 if (TagD && !Tag) 2178 return 0; 2179 return ActOnFriendTypeDecl(S, DS, TemplateParams); 2180 } 2181 2182 // Track whether we warned about the fact that there aren't any 2183 // declarators. 2184 bool emittedWarning = false; 2185 2186 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 2187 ProcessDeclAttributeList(S, Record, DS.getAttributes().getList()); 2188 2189 if (!Record->getDeclName() && Record->isDefinition() && 2190 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { 2191 if (getLangOptions().CPlusPlus || 2192 Record->getDeclContext()->isRecord()) 2193 return BuildAnonymousStructOrUnion(S, DS, AS, Record); 2194 2195 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 2196 << DS.getSourceRange(); 2197 emittedWarning = true; 2198 } 2199 } 2200 2201 // Check for Microsoft C extension: anonymous struct. 2202 if (getLangOptions().Microsoft && !getLangOptions().CPlusPlus && 2203 CurContext->isRecord() && 2204 DS.getStorageClassSpec() == DeclSpec::SCS_unspecified) { 2205 // Handle 2 kinds of anonymous struct: 2206 // struct STRUCT; 2207 // and 2208 // STRUCT_TYPE; <- where STRUCT_TYPE is a typedef struct. 2209 RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag); 2210 if ((Record && Record->getDeclName() && !Record->isDefinition()) || 2211 (DS.getTypeSpecType() == DeclSpec::TST_typename && 2212 DS.getRepAsType().get()->isStructureType())) { 2213 Diag(DS.getSourceRange().getBegin(), diag::ext_ms_anonymous_struct) 2214 << DS.getSourceRange(); 2215 return BuildMicrosoftCAnonymousStruct(S, DS, Record); 2216 } 2217 } 2218 2219 if (getLangOptions().CPlusPlus && 2220 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) 2221 if (EnumDecl *Enum = dyn_cast_or_null<EnumDecl>(Tag)) 2222 if (Enum->enumerator_begin() == Enum->enumerator_end() && 2223 !Enum->getIdentifier() && !Enum->isInvalidDecl()) { 2224 Diag(Enum->getLocation(), diag::ext_no_declarators) 2225 << DS.getSourceRange(); 2226 emittedWarning = true; 2227 } 2228 2229 // Skip all the checks below if we have a type error. 2230 if (DS.getTypeSpecType() == DeclSpec::TST_error) return TagD; 2231 2232 if (!DS.isMissingDeclaratorOk()) { 2233 // Warn about typedefs of enums without names, since this is an 2234 // extension in both Microsoft and GNU. 2235 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 2236 Tag && isa<EnumDecl>(Tag)) { 2237 Diag(DS.getSourceRange().getBegin(), diag::ext_typedef_without_a_name) 2238 << DS.getSourceRange(); 2239 return Tag; 2240 } 2241 2242 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 2243 << DS.getSourceRange(); 2244 emittedWarning = true; 2245 } 2246 2247 // We're going to complain about a bunch of spurious specifiers; 2248 // only do this if we're declaring a tag, because otherwise we 2249 // should be getting diag::ext_no_declarators. 2250 if (emittedWarning || (TagD && TagD->isInvalidDecl())) 2251 return TagD; 2252 2253 // Note that a linkage-specification sets a storage class, but 2254 // 'extern "C" struct foo;' is actually valid and not theoretically 2255 // useless. 2256 if (DeclSpec::SCS scs = DS.getStorageClassSpec()) 2257 if (!DS.isExternInLinkageSpec()) 2258 Diag(DS.getStorageClassSpecLoc(), diag::warn_standalone_specifier) 2259 << DeclSpec::getSpecifierName(scs); 2260 2261 if (DS.isThreadSpecified()) 2262 Diag(DS.getThreadSpecLoc(), diag::warn_standalone_specifier) << "__thread"; 2263 if (DS.getTypeQualifiers()) { 2264 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2265 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "const"; 2266 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2267 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "volatile"; 2268 // Restrict is covered above. 2269 } 2270 if (DS.isInlineSpecified()) 2271 Diag(DS.getInlineSpecLoc(), diag::warn_standalone_specifier) << "inline"; 2272 if (DS.isVirtualSpecified()) 2273 Diag(DS.getVirtualSpecLoc(), diag::warn_standalone_specifier) << "virtual"; 2274 if (DS.isExplicitSpecified()) 2275 Diag(DS.getExplicitSpecLoc(), diag::warn_standalone_specifier) <<"explicit"; 2276 2277 // FIXME: Warn on useless attributes 2278 2279 return TagD; 2280} 2281 2282/// ActOnVlaStmt - This rouine if finds a vla expression in a decl spec. 2283/// builds a statement for it and returns it so it is evaluated. 2284StmtResult Sema::ActOnVlaStmt(const DeclSpec &DS) { 2285 StmtResult R; 2286 if (DS.getTypeSpecType() == DeclSpec::TST_typeofExpr) { 2287 Expr *Exp = DS.getRepAsExpr(); 2288 QualType Ty = Exp->getType(); 2289 if (Ty->isPointerType()) { 2290 do 2291 Ty = Ty->getAs<PointerType>()->getPointeeType(); 2292 while (Ty->isPointerType()); 2293 } 2294 if (Ty->isVariableArrayType()) { 2295 R = ActOnExprStmt(MakeFullExpr(Exp)); 2296 } 2297 } 2298 return R; 2299} 2300 2301/// We are trying to inject an anonymous member into the given scope; 2302/// check if there's an existing declaration that can't be overloaded. 2303/// 2304/// \return true if this is a forbidden redeclaration 2305static bool CheckAnonMemberRedeclaration(Sema &SemaRef, 2306 Scope *S, 2307 DeclContext *Owner, 2308 DeclarationName Name, 2309 SourceLocation NameLoc, 2310 unsigned diagnostic) { 2311 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupMemberName, 2312 Sema::ForRedeclaration); 2313 if (!SemaRef.LookupName(R, S)) return false; 2314 2315 if (R.getAsSingle<TagDecl>()) 2316 return false; 2317 2318 // Pick a representative declaration. 2319 NamedDecl *PrevDecl = R.getRepresentativeDecl()->getUnderlyingDecl(); 2320 assert(PrevDecl && "Expected a non-null Decl"); 2321 2322 if (!SemaRef.isDeclInScope(PrevDecl, Owner, S)) 2323 return false; 2324 2325 SemaRef.Diag(NameLoc, diagnostic) << Name; 2326 SemaRef.Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 2327 2328 return true; 2329} 2330 2331/// InjectAnonymousStructOrUnionMembers - Inject the members of the 2332/// anonymous struct or union AnonRecord into the owning context Owner 2333/// and scope S. This routine will be invoked just after we realize 2334/// that an unnamed union or struct is actually an anonymous union or 2335/// struct, e.g., 2336/// 2337/// @code 2338/// union { 2339/// int i; 2340/// float f; 2341/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 2342/// // f into the surrounding scope.x 2343/// @endcode 2344/// 2345/// This routine is recursive, injecting the names of nested anonymous 2346/// structs/unions into the owning context and scope as well. 2347static bool InjectAnonymousStructOrUnionMembers(Sema &SemaRef, Scope *S, 2348 DeclContext *Owner, 2349 RecordDecl *AnonRecord, 2350 AccessSpecifier AS, 2351 llvm::SmallVector<NamedDecl*, 2> &Chaining, 2352 bool MSAnonStruct) { 2353 unsigned diagKind 2354 = AnonRecord->isUnion() ? diag::err_anonymous_union_member_redecl 2355 : diag::err_anonymous_struct_member_redecl; 2356 2357 bool Invalid = false; 2358 2359 // Look every FieldDecl and IndirectFieldDecl with a name. 2360 for (RecordDecl::decl_iterator D = AnonRecord->decls_begin(), 2361 DEnd = AnonRecord->decls_end(); 2362 D != DEnd; ++D) { 2363 if ((isa<FieldDecl>(*D) || isa<IndirectFieldDecl>(*D)) && 2364 cast<NamedDecl>(*D)->getDeclName()) { 2365 ValueDecl *VD = cast<ValueDecl>(*D); 2366 if (CheckAnonMemberRedeclaration(SemaRef, S, Owner, VD->getDeclName(), 2367 VD->getLocation(), diagKind)) { 2368 // C++ [class.union]p2: 2369 // The names of the members of an anonymous union shall be 2370 // distinct from the names of any other entity in the 2371 // scope in which the anonymous union is declared. 2372 Invalid = true; 2373 } else { 2374 // C++ [class.union]p2: 2375 // For the purpose of name lookup, after the anonymous union 2376 // definition, the members of the anonymous union are 2377 // considered to have been defined in the scope in which the 2378 // anonymous union is declared. 2379 unsigned OldChainingSize = Chaining.size(); 2380 if (IndirectFieldDecl *IF = dyn_cast<IndirectFieldDecl>(VD)) 2381 for (IndirectFieldDecl::chain_iterator PI = IF->chain_begin(), 2382 PE = IF->chain_end(); PI != PE; ++PI) 2383 Chaining.push_back(*PI); 2384 else 2385 Chaining.push_back(VD); 2386 2387 assert(Chaining.size() >= 2); 2388 NamedDecl **NamedChain = 2389 new (SemaRef.Context)NamedDecl*[Chaining.size()]; 2390 for (unsigned i = 0; i < Chaining.size(); i++) 2391 NamedChain[i] = Chaining[i]; 2392 2393 IndirectFieldDecl* IndirectField = 2394 IndirectFieldDecl::Create(SemaRef.Context, Owner, VD->getLocation(), 2395 VD->getIdentifier(), VD->getType(), 2396 NamedChain, Chaining.size()); 2397 2398 IndirectField->setAccess(AS); 2399 IndirectField->setImplicit(); 2400 SemaRef.PushOnScopeChains(IndirectField, S); 2401 2402 // That includes picking up the appropriate access specifier. 2403 if (AS != AS_none) IndirectField->setAccess(AS); 2404 2405 Chaining.resize(OldChainingSize); 2406 } 2407 } 2408 } 2409 2410 return Invalid; 2411} 2412 2413/// StorageClassSpecToVarDeclStorageClass - Maps a DeclSpec::SCS to 2414/// a VarDecl::StorageClass. Any error reporting is up to the caller: 2415/// illegal input values are mapped to SC_None. 2416static StorageClass 2417StorageClassSpecToVarDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2418 switch (StorageClassSpec) { 2419 case DeclSpec::SCS_unspecified: return SC_None; 2420 case DeclSpec::SCS_extern: return SC_Extern; 2421 case DeclSpec::SCS_static: return SC_Static; 2422 case DeclSpec::SCS_auto: return SC_Auto; 2423 case DeclSpec::SCS_register: return SC_Register; 2424 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2425 // Illegal SCSs map to None: error reporting is up to the caller. 2426 case DeclSpec::SCS_mutable: // Fall through. 2427 case DeclSpec::SCS_typedef: return SC_None; 2428 } 2429 llvm_unreachable("unknown storage class specifier"); 2430} 2431 2432/// StorageClassSpecToFunctionDeclStorageClass - Maps a DeclSpec::SCS to 2433/// a StorageClass. Any error reporting is up to the caller: 2434/// illegal input values are mapped to SC_None. 2435static StorageClass 2436StorageClassSpecToFunctionDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2437 switch (StorageClassSpec) { 2438 case DeclSpec::SCS_unspecified: return SC_None; 2439 case DeclSpec::SCS_extern: return SC_Extern; 2440 case DeclSpec::SCS_static: return SC_Static; 2441 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2442 // Illegal SCSs map to None: error reporting is up to the caller. 2443 case DeclSpec::SCS_auto: // Fall through. 2444 case DeclSpec::SCS_mutable: // Fall through. 2445 case DeclSpec::SCS_register: // Fall through. 2446 case DeclSpec::SCS_typedef: return SC_None; 2447 } 2448 llvm_unreachable("unknown storage class specifier"); 2449} 2450 2451/// BuildAnonymousStructOrUnion - Handle the declaration of an 2452/// anonymous structure or union. Anonymous unions are a C++ feature 2453/// (C++ [class.union]) and a GNU C extension; anonymous structures 2454/// are a GNU C and GNU C++ extension. 2455Decl *Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 2456 AccessSpecifier AS, 2457 RecordDecl *Record) { 2458 DeclContext *Owner = Record->getDeclContext(); 2459 2460 // Diagnose whether this anonymous struct/union is an extension. 2461 if (Record->isUnion() && !getLangOptions().CPlusPlus) 2462 Diag(Record->getLocation(), diag::ext_anonymous_union); 2463 else if (!Record->isUnion()) 2464 Diag(Record->getLocation(), diag::ext_anonymous_struct); 2465 2466 // C and C++ require different kinds of checks for anonymous 2467 // structs/unions. 2468 bool Invalid = false; 2469 if (getLangOptions().CPlusPlus) { 2470 const char* PrevSpec = 0; 2471 unsigned DiagID; 2472 // C++ [class.union]p3: 2473 // Anonymous unions declared in a named namespace or in the 2474 // global namespace shall be declared static. 2475 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 2476 (isa<TranslationUnitDecl>(Owner) || 2477 (isa<NamespaceDecl>(Owner) && 2478 cast<NamespaceDecl>(Owner)->getDeclName()))) { 2479 Diag(Record->getLocation(), diag::err_anonymous_union_not_static); 2480 Invalid = true; 2481 2482 // Recover by adding 'static'. 2483 DS.SetStorageClassSpec(DeclSpec::SCS_static, SourceLocation(), 2484 PrevSpec, DiagID, getLangOptions()); 2485 } 2486 // C++ [class.union]p3: 2487 // A storage class is not allowed in a declaration of an 2488 // anonymous union in a class scope. 2489 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 2490 isa<RecordDecl>(Owner)) { 2491 Diag(DS.getStorageClassSpecLoc(), 2492 diag::err_anonymous_union_with_storage_spec); 2493 Invalid = true; 2494 2495 // Recover by removing the storage specifier. 2496 DS.SetStorageClassSpec(DeclSpec::SCS_unspecified, SourceLocation(), 2497 PrevSpec, DiagID, getLangOptions()); 2498 } 2499 2500 // Ignore const/volatile/restrict qualifiers. 2501 if (DS.getTypeQualifiers()) { 2502 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2503 Diag(DS.getConstSpecLoc(), diag::ext_anonymous_struct_union_qualified) 2504 << Record->isUnion() << 0 2505 << FixItHint::CreateRemoval(DS.getConstSpecLoc()); 2506 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2507 Diag(DS.getVolatileSpecLoc(), diag::ext_anonymous_struct_union_qualified) 2508 << Record->isUnion() << 1 2509 << FixItHint::CreateRemoval(DS.getVolatileSpecLoc()); 2510 if (DS.getTypeQualifiers() & DeclSpec::TQ_restrict) 2511 Diag(DS.getRestrictSpecLoc(), diag::ext_anonymous_struct_union_qualified) 2512 << Record->isUnion() << 2 2513 << FixItHint::CreateRemoval(DS.getRestrictSpecLoc()); 2514 2515 DS.ClearTypeQualifiers(); 2516 } 2517 2518 // C++ [class.union]p2: 2519 // The member-specification of an anonymous union shall only 2520 // define non-static data members. [Note: nested types and 2521 // functions cannot be declared within an anonymous union. ] 2522 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 2523 MemEnd = Record->decls_end(); 2524 Mem != MemEnd; ++Mem) { 2525 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 2526 // C++ [class.union]p3: 2527 // An anonymous union shall not have private or protected 2528 // members (clause 11). 2529 assert(FD->getAccess() != AS_none); 2530 if (FD->getAccess() != AS_public) { 2531 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 2532 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 2533 Invalid = true; 2534 } 2535 2536 // C++ [class.union]p1 2537 // An object of a class with a non-trivial constructor, a non-trivial 2538 // copy constructor, a non-trivial destructor, or a non-trivial copy 2539 // assignment operator cannot be a member of a union, nor can an 2540 // array of such objects. 2541 if (!getLangOptions().CPlusPlus0x && CheckNontrivialField(FD)) 2542 Invalid = true; 2543 } else if ((*Mem)->isImplicit()) { 2544 // Any implicit members are fine. 2545 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 2546 // This is a type that showed up in an 2547 // elaborated-type-specifier inside the anonymous struct or 2548 // union, but which actually declares a type outside of the 2549 // anonymous struct or union. It's okay. 2550 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 2551 if (!MemRecord->isAnonymousStructOrUnion() && 2552 MemRecord->getDeclName()) { 2553 // Visual C++ allows type definition in anonymous struct or union. 2554 if (getLangOptions().Microsoft) 2555 Diag(MemRecord->getLocation(), diag::ext_anonymous_record_with_type) 2556 << (int)Record->isUnion(); 2557 else { 2558 // This is a nested type declaration. 2559 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 2560 << (int)Record->isUnion(); 2561 Invalid = true; 2562 } 2563 } 2564 } else if (isa<AccessSpecDecl>(*Mem)) { 2565 // Any access specifier is fine. 2566 } else { 2567 // We have something that isn't a non-static data 2568 // member. Complain about it. 2569 unsigned DK = diag::err_anonymous_record_bad_member; 2570 if (isa<TypeDecl>(*Mem)) 2571 DK = diag::err_anonymous_record_with_type; 2572 else if (isa<FunctionDecl>(*Mem)) 2573 DK = diag::err_anonymous_record_with_function; 2574 else if (isa<VarDecl>(*Mem)) 2575 DK = diag::err_anonymous_record_with_static; 2576 2577 // Visual C++ allows type definition in anonymous struct or union. 2578 if (getLangOptions().Microsoft && 2579 DK == diag::err_anonymous_record_with_type) 2580 Diag((*Mem)->getLocation(), diag::ext_anonymous_record_with_type) 2581 << (int)Record->isUnion(); 2582 else { 2583 Diag((*Mem)->getLocation(), DK) 2584 << (int)Record->isUnion(); 2585 Invalid = true; 2586 } 2587 } 2588 } 2589 } 2590 2591 if (!Record->isUnion() && !Owner->isRecord()) { 2592 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 2593 << (int)getLangOptions().CPlusPlus; 2594 Invalid = true; 2595 } 2596 2597 // Mock up a declarator. 2598 Declarator Dc(DS, Declarator::TypeNameContext); 2599 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2600 assert(TInfo && "couldn't build declarator info for anonymous struct/union"); 2601 2602 // Create a declaration for this anonymous struct/union. 2603 NamedDecl *Anon = 0; 2604 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 2605 Anon = FieldDecl::Create(Context, OwningClass, 2606 DS.getSourceRange().getBegin(), 2607 Record->getLocation(), 2608 /*IdentifierInfo=*/0, 2609 Context.getTypeDeclType(Record), 2610 TInfo, 2611 /*BitWidth=*/0, /*Mutable=*/false); 2612 Anon->setAccess(AS); 2613 if (getLangOptions().CPlusPlus) 2614 FieldCollector->Add(cast<FieldDecl>(Anon)); 2615 } else { 2616 DeclSpec::SCS SCSpec = DS.getStorageClassSpec(); 2617 assert(SCSpec != DeclSpec::SCS_typedef && 2618 "Parser allowed 'typedef' as storage class VarDecl."); 2619 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 2620 if (SCSpec == DeclSpec::SCS_mutable) { 2621 // mutable can only appear on non-static class members, so it's always 2622 // an error here 2623 Diag(Record->getLocation(), diag::err_mutable_nonmember); 2624 Invalid = true; 2625 SC = SC_None; 2626 } 2627 SCSpec = DS.getStorageClassSpecAsWritten(); 2628 VarDecl::StorageClass SCAsWritten 2629 = StorageClassSpecToVarDeclStorageClass(SCSpec); 2630 2631 Anon = VarDecl::Create(Context, Owner, 2632 DS.getSourceRange().getBegin(), 2633 Record->getLocation(), /*IdentifierInfo=*/0, 2634 Context.getTypeDeclType(Record), 2635 TInfo, SC, SCAsWritten); 2636 } 2637 Anon->setImplicit(); 2638 2639 // Add the anonymous struct/union object to the current 2640 // context. We'll be referencing this object when we refer to one of 2641 // its members. 2642 Owner->addDecl(Anon); 2643 2644 // Inject the members of the anonymous struct/union into the owning 2645 // context and into the identifier resolver chain for name lookup 2646 // purposes. 2647 llvm::SmallVector<NamedDecl*, 2> Chain; 2648 Chain.push_back(Anon); 2649 2650 if (InjectAnonymousStructOrUnionMembers(*this, S, Owner, Record, AS, 2651 Chain, false)) 2652 Invalid = true; 2653 2654 // Mark this as an anonymous struct/union type. Note that we do not 2655 // do this until after we have already checked and injected the 2656 // members of this anonymous struct/union type, because otherwise 2657 // the members could be injected twice: once by DeclContext when it 2658 // builds its lookup table, and once by 2659 // InjectAnonymousStructOrUnionMembers. 2660 Record->setAnonymousStructOrUnion(true); 2661 2662 if (Invalid) 2663 Anon->setInvalidDecl(); 2664 2665 return Anon; 2666} 2667 2668/// BuildMicrosoftCAnonymousStruct - Handle the declaration of an 2669/// Microsoft C anonymous structure. 2670/// Ref: http://msdn.microsoft.com/en-us/library/z2cx9y4f.aspx 2671/// Example: 2672/// 2673/// struct A { int a; }; 2674/// struct B { struct A; int b; }; 2675/// 2676/// void foo() { 2677/// B var; 2678/// var.a = 3; 2679/// } 2680/// 2681Decl *Sema::BuildMicrosoftCAnonymousStruct(Scope *S, DeclSpec &DS, 2682 RecordDecl *Record) { 2683 2684 // If there is no Record, get the record via the typedef. 2685 if (!Record) 2686 Record = DS.getRepAsType().get()->getAsStructureType()->getDecl(); 2687 2688 // Mock up a declarator. 2689 Declarator Dc(DS, Declarator::TypeNameContext); 2690 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2691 assert(TInfo && "couldn't build declarator info for anonymous struct"); 2692 2693 // Create a declaration for this anonymous struct. 2694 NamedDecl* Anon = FieldDecl::Create(Context, 2695 cast<RecordDecl>(CurContext), 2696 DS.getSourceRange().getBegin(), 2697 DS.getSourceRange().getBegin(), 2698 /*IdentifierInfo=*/0, 2699 Context.getTypeDeclType(Record), 2700 TInfo, 2701 /*BitWidth=*/0, /*Mutable=*/false); 2702 Anon->setImplicit(); 2703 2704 // Add the anonymous struct object to the current context. 2705 CurContext->addDecl(Anon); 2706 2707 // Inject the members of the anonymous struct into the current 2708 // context and into the identifier resolver chain for name lookup 2709 // purposes. 2710 llvm::SmallVector<NamedDecl*, 2> Chain; 2711 Chain.push_back(Anon); 2712 2713 if (InjectAnonymousStructOrUnionMembers(*this, S, CurContext, 2714 Record->getDefinition(), 2715 AS_none, Chain, true)) 2716 Anon->setInvalidDecl(); 2717 2718 return Anon; 2719} 2720 2721/// GetNameForDeclarator - Determine the full declaration name for the 2722/// given Declarator. 2723DeclarationNameInfo Sema::GetNameForDeclarator(Declarator &D) { 2724 return GetNameFromUnqualifiedId(D.getName()); 2725} 2726 2727/// \brief Retrieves the declaration name from a parsed unqualified-id. 2728DeclarationNameInfo 2729Sema::GetNameFromUnqualifiedId(const UnqualifiedId &Name) { 2730 DeclarationNameInfo NameInfo; 2731 NameInfo.setLoc(Name.StartLocation); 2732 2733 switch (Name.getKind()) { 2734 2735 case UnqualifiedId::IK_Identifier: 2736 NameInfo.setName(Name.Identifier); 2737 NameInfo.setLoc(Name.StartLocation); 2738 return NameInfo; 2739 2740 case UnqualifiedId::IK_OperatorFunctionId: 2741 NameInfo.setName(Context.DeclarationNames.getCXXOperatorName( 2742 Name.OperatorFunctionId.Operator)); 2743 NameInfo.setLoc(Name.StartLocation); 2744 NameInfo.getInfo().CXXOperatorName.BeginOpNameLoc 2745 = Name.OperatorFunctionId.SymbolLocations[0]; 2746 NameInfo.getInfo().CXXOperatorName.EndOpNameLoc 2747 = Name.EndLocation.getRawEncoding(); 2748 return NameInfo; 2749 2750 case UnqualifiedId::IK_LiteralOperatorId: 2751 NameInfo.setName(Context.DeclarationNames.getCXXLiteralOperatorName( 2752 Name.Identifier)); 2753 NameInfo.setLoc(Name.StartLocation); 2754 NameInfo.setCXXLiteralOperatorNameLoc(Name.EndLocation); 2755 return NameInfo; 2756 2757 case UnqualifiedId::IK_ConversionFunctionId: { 2758 TypeSourceInfo *TInfo; 2759 QualType Ty = GetTypeFromParser(Name.ConversionFunctionId, &TInfo); 2760 if (Ty.isNull()) 2761 return DeclarationNameInfo(); 2762 NameInfo.setName(Context.DeclarationNames.getCXXConversionFunctionName( 2763 Context.getCanonicalType(Ty))); 2764 NameInfo.setLoc(Name.StartLocation); 2765 NameInfo.setNamedTypeInfo(TInfo); 2766 return NameInfo; 2767 } 2768 2769 case UnqualifiedId::IK_ConstructorName: { 2770 TypeSourceInfo *TInfo; 2771 QualType Ty = GetTypeFromParser(Name.ConstructorName, &TInfo); 2772 if (Ty.isNull()) 2773 return DeclarationNameInfo(); 2774 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 2775 Context.getCanonicalType(Ty))); 2776 NameInfo.setLoc(Name.StartLocation); 2777 NameInfo.setNamedTypeInfo(TInfo); 2778 return NameInfo; 2779 } 2780 2781 case UnqualifiedId::IK_ConstructorTemplateId: { 2782 // In well-formed code, we can only have a constructor 2783 // template-id that refers to the current context, so go there 2784 // to find the actual type being constructed. 2785 CXXRecordDecl *CurClass = dyn_cast<CXXRecordDecl>(CurContext); 2786 if (!CurClass || CurClass->getIdentifier() != Name.TemplateId->Name) 2787 return DeclarationNameInfo(); 2788 2789 // Determine the type of the class being constructed. 2790 QualType CurClassType = Context.getTypeDeclType(CurClass); 2791 2792 // FIXME: Check two things: that the template-id names the same type as 2793 // CurClassType, and that the template-id does not occur when the name 2794 // was qualified. 2795 2796 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 2797 Context.getCanonicalType(CurClassType))); 2798 NameInfo.setLoc(Name.StartLocation); 2799 // FIXME: should we retrieve TypeSourceInfo? 2800 NameInfo.setNamedTypeInfo(0); 2801 return NameInfo; 2802 } 2803 2804 case UnqualifiedId::IK_DestructorName: { 2805 TypeSourceInfo *TInfo; 2806 QualType Ty = GetTypeFromParser(Name.DestructorName, &TInfo); 2807 if (Ty.isNull()) 2808 return DeclarationNameInfo(); 2809 NameInfo.setName(Context.DeclarationNames.getCXXDestructorName( 2810 Context.getCanonicalType(Ty))); 2811 NameInfo.setLoc(Name.StartLocation); 2812 NameInfo.setNamedTypeInfo(TInfo); 2813 return NameInfo; 2814 } 2815 2816 case UnqualifiedId::IK_TemplateId: { 2817 TemplateName TName = Name.TemplateId->Template.get(); 2818 SourceLocation TNameLoc = Name.TemplateId->TemplateNameLoc; 2819 return Context.getNameForTemplate(TName, TNameLoc); 2820 } 2821 2822 } // switch (Name.getKind()) 2823 2824 assert(false && "Unknown name kind"); 2825 return DeclarationNameInfo(); 2826} 2827 2828/// isNearlyMatchingFunction - Determine whether the C++ functions 2829/// Declaration and Definition are "nearly" matching. This heuristic 2830/// is used to improve diagnostics in the case where an out-of-line 2831/// function definition doesn't match any declaration within 2832/// the class or namespace. 2833static bool isNearlyMatchingFunction(ASTContext &Context, 2834 FunctionDecl *Declaration, 2835 FunctionDecl *Definition) { 2836 if (Declaration->param_size() != Definition->param_size()) 2837 return false; 2838 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 2839 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 2840 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 2841 2842 if (!Context.hasSameUnqualifiedType(DeclParamTy.getNonReferenceType(), 2843 DefParamTy.getNonReferenceType())) 2844 return false; 2845 } 2846 2847 return true; 2848} 2849 2850/// NeedsRebuildingInCurrentInstantiation - Checks whether the given 2851/// declarator needs to be rebuilt in the current instantiation. 2852/// Any bits of declarator which appear before the name are valid for 2853/// consideration here. That's specifically the type in the decl spec 2854/// and the base type in any member-pointer chunks. 2855static bool RebuildDeclaratorInCurrentInstantiation(Sema &S, Declarator &D, 2856 DeclarationName Name) { 2857 // The types we specifically need to rebuild are: 2858 // - typenames, typeofs, and decltypes 2859 // - types which will become injected class names 2860 // Of course, we also need to rebuild any type referencing such a 2861 // type. It's safest to just say "dependent", but we call out a 2862 // few cases here. 2863 2864 DeclSpec &DS = D.getMutableDeclSpec(); 2865 switch (DS.getTypeSpecType()) { 2866 case DeclSpec::TST_typename: 2867 case DeclSpec::TST_typeofType: 2868 case DeclSpec::TST_decltype: 2869 case DeclSpec::TST_underlyingType: { 2870 // Grab the type from the parser. 2871 TypeSourceInfo *TSI = 0; 2872 QualType T = S.GetTypeFromParser(DS.getRepAsType(), &TSI); 2873 if (T.isNull() || !T->isDependentType()) break; 2874 2875 // Make sure there's a type source info. This isn't really much 2876 // of a waste; most dependent types should have type source info 2877 // attached already. 2878 if (!TSI) 2879 TSI = S.Context.getTrivialTypeSourceInfo(T, DS.getTypeSpecTypeLoc()); 2880 2881 // Rebuild the type in the current instantiation. 2882 TSI = S.RebuildTypeInCurrentInstantiation(TSI, D.getIdentifierLoc(), Name); 2883 if (!TSI) return true; 2884 2885 // Store the new type back in the decl spec. 2886 ParsedType LocType = S.CreateParsedType(TSI->getType(), TSI); 2887 DS.UpdateTypeRep(LocType); 2888 break; 2889 } 2890 2891 case DeclSpec::TST_typeofExpr: { 2892 Expr *E = DS.getRepAsExpr(); 2893 ExprResult Result = S.RebuildExprInCurrentInstantiation(E); 2894 if (Result.isInvalid()) return true; 2895 DS.UpdateExprRep(Result.get()); 2896 break; 2897 } 2898 2899 default: 2900 // Nothing to do for these decl specs. 2901 break; 2902 } 2903 2904 // It doesn't matter what order we do this in. 2905 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) { 2906 DeclaratorChunk &Chunk = D.getTypeObject(I); 2907 2908 // The only type information in the declarator which can come 2909 // before the declaration name is the base type of a member 2910 // pointer. 2911 if (Chunk.Kind != DeclaratorChunk::MemberPointer) 2912 continue; 2913 2914 // Rebuild the scope specifier in-place. 2915 CXXScopeSpec &SS = Chunk.Mem.Scope(); 2916 if (S.RebuildNestedNameSpecifierInCurrentInstantiation(SS)) 2917 return true; 2918 } 2919 2920 return false; 2921} 2922 2923Decl *Sema::ActOnDeclarator(Scope *S, Declarator &D, 2924 bool IsFunctionDefinition) { 2925 return HandleDeclarator(S, D, MultiTemplateParamsArg(*this), 2926 IsFunctionDefinition); 2927} 2928 2929/// DiagnoseClassNameShadow - Implement C++ [class.mem]p13: 2930/// If T is the name of a class, then each of the following shall have a 2931/// name different from T: 2932/// - every static data member of class T; 2933/// - every member function of class T 2934/// - every member of class T that is itself a type; 2935/// \returns true if the declaration name violates these rules. 2936bool Sema::DiagnoseClassNameShadow(DeclContext *DC, 2937 DeclarationNameInfo NameInfo) { 2938 DeclarationName Name = NameInfo.getName(); 2939 2940 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(DC)) 2941 if (Record->getIdentifier() && Record->getDeclName() == Name) { 2942 Diag(NameInfo.getLoc(), diag::err_member_name_of_class) << Name; 2943 return true; 2944 } 2945 2946 return false; 2947} 2948 2949Decl *Sema::HandleDeclarator(Scope *S, Declarator &D, 2950 MultiTemplateParamsArg TemplateParamLists, 2951 bool IsFunctionDefinition) { 2952 // TODO: consider using NameInfo for diagnostic. 2953 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 2954 DeclarationName Name = NameInfo.getName(); 2955 2956 // All of these full declarators require an identifier. If it doesn't have 2957 // one, the ParsedFreeStandingDeclSpec action should be used. 2958 if (!Name) { 2959 if (!D.isInvalidType()) // Reject this if we think it is valid. 2960 Diag(D.getDeclSpec().getSourceRange().getBegin(), 2961 diag::err_declarator_need_ident) 2962 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 2963 return 0; 2964 } else if (DiagnoseUnexpandedParameterPack(NameInfo, UPPC_DeclarationType)) 2965 return 0; 2966 2967 // The scope passed in may not be a decl scope. Zip up the scope tree until 2968 // we find one that is. 2969 while ((S->getFlags() & Scope::DeclScope) == 0 || 2970 (S->getFlags() & Scope::TemplateParamScope) != 0) 2971 S = S->getParent(); 2972 2973 DeclContext *DC = CurContext; 2974 if (D.getCXXScopeSpec().isInvalid()) 2975 D.setInvalidType(); 2976 else if (D.getCXXScopeSpec().isSet()) { 2977 if (DiagnoseUnexpandedParameterPack(D.getCXXScopeSpec(), 2978 UPPC_DeclarationQualifier)) 2979 return 0; 2980 2981 bool EnteringContext = !D.getDeclSpec().isFriendSpecified(); 2982 DC = computeDeclContext(D.getCXXScopeSpec(), EnteringContext); 2983 if (!DC) { 2984 // If we could not compute the declaration context, it's because the 2985 // declaration context is dependent but does not refer to a class, 2986 // class template, or class template partial specialization. Complain 2987 // and return early, to avoid the coming semantic disaster. 2988 Diag(D.getIdentifierLoc(), 2989 diag::err_template_qualified_declarator_no_match) 2990 << (NestedNameSpecifier*)D.getCXXScopeSpec().getScopeRep() 2991 << D.getCXXScopeSpec().getRange(); 2992 return 0; 2993 } 2994 bool IsDependentContext = DC->isDependentContext(); 2995 2996 if (!IsDependentContext && 2997 RequireCompleteDeclContext(D.getCXXScopeSpec(), DC)) 2998 return 0; 2999 3000 if (isa<CXXRecordDecl>(DC)) { 3001 if (!cast<CXXRecordDecl>(DC)->hasDefinition()) { 3002 Diag(D.getIdentifierLoc(), 3003 diag::err_member_def_undefined_record) 3004 << Name << DC << D.getCXXScopeSpec().getRange(); 3005 D.setInvalidType(); 3006 } else if (isa<CXXRecordDecl>(CurContext) && 3007 !D.getDeclSpec().isFriendSpecified()) { 3008 // The user provided a superfluous scope specifier inside a class 3009 // definition: 3010 // 3011 // class X { 3012 // void X::f(); 3013 // }; 3014 if (CurContext->Equals(DC)) 3015 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 3016 << Name << FixItHint::CreateRemoval(D.getCXXScopeSpec().getRange()); 3017 else 3018 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 3019 << Name << D.getCXXScopeSpec().getRange(); 3020 3021 // Pretend that this qualifier was not here. 3022 D.getCXXScopeSpec().clear(); 3023 } 3024 } 3025 3026 // Check whether we need to rebuild the type of the given 3027 // declaration in the current instantiation. 3028 if (EnteringContext && IsDependentContext && 3029 TemplateParamLists.size() != 0) { 3030 ContextRAII SavedContext(*this, DC); 3031 if (RebuildDeclaratorInCurrentInstantiation(*this, D, Name)) 3032 D.setInvalidType(); 3033 } 3034 } 3035 3036 if (DiagnoseClassNameShadow(DC, NameInfo)) 3037 // If this is a typedef, we'll end up spewing multiple diagnostics. 3038 // Just return early; it's safer. 3039 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3040 return 0; 3041 3042 NamedDecl *New; 3043 3044 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 3045 QualType R = TInfo->getType(); 3046 3047 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 3048 UPPC_DeclarationType)) 3049 D.setInvalidType(); 3050 3051 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 3052 ForRedeclaration); 3053 3054 // See if this is a redefinition of a variable in the same scope. 3055 if (!D.getCXXScopeSpec().isSet()) { 3056 bool IsLinkageLookup = false; 3057 3058 // If the declaration we're planning to build will be a function 3059 // or object with linkage, then look for another declaration with 3060 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 3061 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3062 /* Do nothing*/; 3063 else if (R->isFunctionType()) { 3064 if (CurContext->isFunctionOrMethod() || 3065 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3066 IsLinkageLookup = true; 3067 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 3068 IsLinkageLookup = true; 3069 else if (CurContext->getRedeclContext()->isTranslationUnit() && 3070 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3071 IsLinkageLookup = true; 3072 3073 if (IsLinkageLookup) 3074 Previous.clear(LookupRedeclarationWithLinkage); 3075 3076 LookupName(Previous, S, /* CreateBuiltins = */ IsLinkageLookup); 3077 } else { // Something like "int foo::x;" 3078 LookupQualifiedName(Previous, DC); 3079 3080 // Don't consider using declarations as previous declarations for 3081 // out-of-line members. 3082 RemoveUsingDecls(Previous); 3083 3084 // C++ 7.3.1.2p2: 3085 // Members (including explicit specializations of templates) of a named 3086 // namespace can also be defined outside that namespace by explicit 3087 // qualification of the name being defined, provided that the entity being 3088 // defined was already declared in the namespace and the definition appears 3089 // after the point of declaration in a namespace that encloses the 3090 // declarations namespace. 3091 // 3092 // Note that we only check the context at this point. We don't yet 3093 // have enough information to make sure that PrevDecl is actually 3094 // the declaration we want to match. For example, given: 3095 // 3096 // class X { 3097 // void f(); 3098 // void f(float); 3099 // }; 3100 // 3101 // void X::f(int) { } // ill-formed 3102 // 3103 // In this case, PrevDecl will point to the overload set 3104 // containing the two f's declared in X, but neither of them 3105 // matches. 3106 3107 // First check whether we named the global scope. 3108 if (isa<TranslationUnitDecl>(DC)) { 3109 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 3110 << Name << D.getCXXScopeSpec().getRange(); 3111 } else { 3112 DeclContext *Cur = CurContext; 3113 while (isa<LinkageSpecDecl>(Cur)) 3114 Cur = Cur->getParent(); 3115 if (!Cur->Encloses(DC)) { 3116 // The qualifying scope doesn't enclose the original declaration. 3117 // Emit diagnostic based on current scope. 3118 SourceLocation L = D.getIdentifierLoc(); 3119 SourceRange R = D.getCXXScopeSpec().getRange(); 3120 if (isa<FunctionDecl>(Cur)) 3121 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 3122 else 3123 Diag(L, diag::err_invalid_declarator_scope) 3124 << Name << cast<NamedDecl>(DC) << R; 3125 D.setInvalidType(); 3126 } 3127 } 3128 } 3129 3130 if (Previous.isSingleResult() && 3131 Previous.getFoundDecl()->isTemplateParameter()) { 3132 // Maybe we will complain about the shadowed template parameter. 3133 if (!D.isInvalidType()) 3134 if (DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), 3135 Previous.getFoundDecl())) 3136 D.setInvalidType(); 3137 3138 // Just pretend that we didn't see the previous declaration. 3139 Previous.clear(); 3140 } 3141 3142 // In C++, the previous declaration we find might be a tag type 3143 // (class or enum). In this case, the new declaration will hide the 3144 // tag type. Note that this does does not apply if we're declaring a 3145 // typedef (C++ [dcl.typedef]p4). 3146 if (Previous.isSingleTagDecl() && 3147 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 3148 Previous.clear(); 3149 3150 bool Redeclaration = false; 3151 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 3152 if (TemplateParamLists.size()) { 3153 Diag(D.getIdentifierLoc(), diag::err_template_typedef); 3154 return 0; 3155 } 3156 3157 New = ActOnTypedefDeclarator(S, D, DC, R, TInfo, Previous, Redeclaration); 3158 } else if (R->isFunctionType()) { 3159 New = ActOnFunctionDeclarator(S, D, DC, R, TInfo, Previous, 3160 move(TemplateParamLists), 3161 IsFunctionDefinition, Redeclaration); 3162 } else { 3163 New = ActOnVariableDeclarator(S, D, DC, R, TInfo, Previous, 3164 move(TemplateParamLists), 3165 Redeclaration); 3166 } 3167 3168 if (New == 0) 3169 return 0; 3170 3171 // If this has an identifier and is not an invalid redeclaration or 3172 // function template specialization, add it to the scope stack. 3173 if (New->getDeclName() && !(Redeclaration && New->isInvalidDecl())) 3174 PushOnScopeChains(New, S); 3175 3176 return New; 3177} 3178 3179/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 3180/// types into constant array types in certain situations which would otherwise 3181/// be errors (for GCC compatibility). 3182static QualType TryToFixInvalidVariablyModifiedType(QualType T, 3183 ASTContext &Context, 3184 bool &SizeIsNegative, 3185 llvm::APSInt &Oversized) { 3186 // This method tries to turn a variable array into a constant 3187 // array even when the size isn't an ICE. This is necessary 3188 // for compatibility with code that depends on gcc's buggy 3189 // constant expression folding, like struct {char x[(int)(char*)2];} 3190 SizeIsNegative = false; 3191 Oversized = 0; 3192 3193 if (T->isDependentType()) 3194 return QualType(); 3195 3196 QualifierCollector Qs; 3197 const Type *Ty = Qs.strip(T); 3198 3199 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) { 3200 QualType Pointee = PTy->getPointeeType(); 3201 QualType FixedType = 3202 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative, 3203 Oversized); 3204 if (FixedType.isNull()) return FixedType; 3205 FixedType = Context.getPointerType(FixedType); 3206 return Qs.apply(Context, FixedType); 3207 } 3208 if (const ParenType* PTy = dyn_cast<ParenType>(Ty)) { 3209 QualType Inner = PTy->getInnerType(); 3210 QualType FixedType = 3211 TryToFixInvalidVariablyModifiedType(Inner, Context, SizeIsNegative, 3212 Oversized); 3213 if (FixedType.isNull()) return FixedType; 3214 FixedType = Context.getParenType(FixedType); 3215 return Qs.apply(Context, FixedType); 3216 } 3217 3218 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 3219 if (!VLATy) 3220 return QualType(); 3221 // FIXME: We should probably handle this case 3222 if (VLATy->getElementType()->isVariablyModifiedType()) 3223 return QualType(); 3224 3225 Expr::EvalResult EvalResult; 3226 if (!VLATy->getSizeExpr() || 3227 !VLATy->getSizeExpr()->Evaluate(EvalResult, Context) || 3228 !EvalResult.Val.isInt()) 3229 return QualType(); 3230 3231 // Check whether the array size is negative. 3232 llvm::APSInt &Res = EvalResult.Val.getInt(); 3233 if (Res.isSigned() && Res.isNegative()) { 3234 SizeIsNegative = true; 3235 return QualType(); 3236 } 3237 3238 // Check whether the array is too large to be addressed. 3239 unsigned ActiveSizeBits 3240 = ConstantArrayType::getNumAddressingBits(Context, VLATy->getElementType(), 3241 Res); 3242 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) { 3243 Oversized = Res; 3244 return QualType(); 3245 } 3246 3247 return Context.getConstantArrayType(VLATy->getElementType(), 3248 Res, ArrayType::Normal, 0); 3249} 3250 3251/// \brief Register the given locally-scoped external C declaration so 3252/// that it can be found later for redeclarations 3253void 3254Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, 3255 const LookupResult &Previous, 3256 Scope *S) { 3257 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 3258 "Decl is not a locally-scoped decl!"); 3259 // Note that we have a locally-scoped external with this name. 3260 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 3261 3262 if (!Previous.isSingleResult()) 3263 return; 3264 3265 NamedDecl *PrevDecl = Previous.getFoundDecl(); 3266 3267 // If there was a previous declaration of this variable, it may be 3268 // in our identifier chain. Update the identifier chain with the new 3269 // declaration. 3270 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 3271 // The previous declaration was found on the identifer resolver 3272 // chain, so remove it from its scope. 3273 while (S && !S->isDeclScope(PrevDecl)) 3274 S = S->getParent(); 3275 3276 if (S) 3277 S->RemoveDecl(PrevDecl); 3278 } 3279} 3280 3281/// \brief Diagnose function specifiers on a declaration of an identifier that 3282/// does not identify a function. 3283void Sema::DiagnoseFunctionSpecifiers(Declarator& D) { 3284 // FIXME: We should probably indicate the identifier in question to avoid 3285 // confusion for constructs like "inline int a(), b;" 3286 if (D.getDeclSpec().isInlineSpecified()) 3287 Diag(D.getDeclSpec().getInlineSpecLoc(), 3288 diag::err_inline_non_function); 3289 3290 if (D.getDeclSpec().isVirtualSpecified()) 3291 Diag(D.getDeclSpec().getVirtualSpecLoc(), 3292 diag::err_virtual_non_function); 3293 3294 if (D.getDeclSpec().isExplicitSpecified()) 3295 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3296 diag::err_explicit_non_function); 3297} 3298 3299NamedDecl* 3300Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 3301 QualType R, TypeSourceInfo *TInfo, 3302 LookupResult &Previous, bool &Redeclaration) { 3303 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 3304 if (D.getCXXScopeSpec().isSet()) { 3305 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 3306 << D.getCXXScopeSpec().getRange(); 3307 D.setInvalidType(); 3308 // Pretend we didn't see the scope specifier. 3309 DC = CurContext; 3310 Previous.clear(); 3311 } 3312 3313 if (getLangOptions().CPlusPlus) { 3314 // Check that there are no default arguments (C++ only). 3315 CheckExtraCXXDefaultArguments(D); 3316 } 3317 3318 DiagnoseFunctionSpecifiers(D); 3319 3320 if (D.getDeclSpec().isThreadSpecified()) 3321 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 3322 3323 if (D.getName().Kind != UnqualifiedId::IK_Identifier) { 3324 Diag(D.getName().StartLocation, diag::err_typedef_not_identifier) 3325 << D.getName().getSourceRange(); 3326 return 0; 3327 } 3328 3329 TypedefDecl *NewTD = ParseTypedefDecl(S, D, R, TInfo); 3330 if (!NewTD) return 0; 3331 3332 // Handle attributes prior to checking for duplicates in MergeVarDecl 3333 ProcessDeclAttributes(S, NewTD, D); 3334 3335 CheckTypedefForVariablyModifiedType(S, NewTD); 3336 3337 return ActOnTypedefNameDecl(S, DC, NewTD, Previous, Redeclaration); 3338} 3339 3340void 3341Sema::CheckTypedefForVariablyModifiedType(Scope *S, TypedefNameDecl *NewTD) { 3342 // C99 6.7.7p2: If a typedef name specifies a variably modified type 3343 // then it shall have block scope. 3344 // Note that variably modified types must be fixed before merging the decl so 3345 // that redeclarations will match. 3346 QualType T = NewTD->getUnderlyingType(); 3347 if (T->isVariablyModifiedType()) { 3348 getCurFunction()->setHasBranchProtectedScope(); 3349 3350 if (S->getFnParent() == 0) { 3351 bool SizeIsNegative; 3352 llvm::APSInt Oversized; 3353 QualType FixedTy = 3354 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 3355 Oversized); 3356 if (!FixedTy.isNull()) { 3357 Diag(NewTD->getLocation(), diag::warn_illegal_constant_array_size); 3358 NewTD->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(FixedTy)); 3359 } else { 3360 if (SizeIsNegative) 3361 Diag(NewTD->getLocation(), diag::err_typecheck_negative_array_size); 3362 else if (T->isVariableArrayType()) 3363 Diag(NewTD->getLocation(), diag::err_vla_decl_in_file_scope); 3364 else if (Oversized.getBoolValue()) 3365 Diag(NewTD->getLocation(), diag::err_array_too_large) << Oversized.toString(10); 3366 else 3367 Diag(NewTD->getLocation(), diag::err_vm_decl_in_file_scope); 3368 NewTD->setInvalidDecl(); 3369 } 3370 } 3371 } 3372} 3373 3374 3375/// ActOnTypedefNameDecl - Perform semantic checking for a declaration which 3376/// declares a typedef-name, either using the 'typedef' type specifier or via 3377/// a C++0x [dcl.typedef]p2 alias-declaration: 'using T = A;'. 3378NamedDecl* 3379Sema::ActOnTypedefNameDecl(Scope *S, DeclContext *DC, TypedefNameDecl *NewTD, 3380 LookupResult &Previous, bool &Redeclaration) { 3381 // Merge the decl with the existing one if appropriate. If the decl is 3382 // in an outer scope, it isn't the same thing. 3383 FilterLookupForScope(Previous, DC, S, /*ConsiderLinkage*/ false, 3384 /*ExplicitInstantiationOrSpecialization=*/false); 3385 if (!Previous.empty()) { 3386 Redeclaration = true; 3387 MergeTypedefNameDecl(NewTD, Previous); 3388 } 3389 3390 // If this is the C FILE type, notify the AST context. 3391 if (IdentifierInfo *II = NewTD->getIdentifier()) 3392 if (!NewTD->isInvalidDecl() && 3393 NewTD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 3394 if (II->isStr("FILE")) 3395 Context.setFILEDecl(NewTD); 3396 else if (II->isStr("jmp_buf")) 3397 Context.setjmp_bufDecl(NewTD); 3398 else if (II->isStr("sigjmp_buf")) 3399 Context.setsigjmp_bufDecl(NewTD); 3400 else if (II->isStr("__builtin_va_list")) 3401 Context.setBuiltinVaListType(Context.getTypedefType(NewTD)); 3402 } 3403 3404 return NewTD; 3405} 3406 3407/// \brief Determines whether the given declaration is an out-of-scope 3408/// previous declaration. 3409/// 3410/// This routine should be invoked when name lookup has found a 3411/// previous declaration (PrevDecl) that is not in the scope where a 3412/// new declaration by the same name is being introduced. If the new 3413/// declaration occurs in a local scope, previous declarations with 3414/// linkage may still be considered previous declarations (C99 3415/// 6.2.2p4-5, C++ [basic.link]p6). 3416/// 3417/// \param PrevDecl the previous declaration found by name 3418/// lookup 3419/// 3420/// \param DC the context in which the new declaration is being 3421/// declared. 3422/// 3423/// \returns true if PrevDecl is an out-of-scope previous declaration 3424/// for a new delcaration with the same name. 3425static bool 3426isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 3427 ASTContext &Context) { 3428 if (!PrevDecl) 3429 return false; 3430 3431 if (!PrevDecl->hasLinkage()) 3432 return false; 3433 3434 if (Context.getLangOptions().CPlusPlus) { 3435 // C++ [basic.link]p6: 3436 // If there is a visible declaration of an entity with linkage 3437 // having the same name and type, ignoring entities declared 3438 // outside the innermost enclosing namespace scope, the block 3439 // scope declaration declares that same entity and receives the 3440 // linkage of the previous declaration. 3441 DeclContext *OuterContext = DC->getRedeclContext(); 3442 if (!OuterContext->isFunctionOrMethod()) 3443 // This rule only applies to block-scope declarations. 3444 return false; 3445 3446 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 3447 if (PrevOuterContext->isRecord()) 3448 // We found a member function: ignore it. 3449 return false; 3450 3451 // Find the innermost enclosing namespace for the new and 3452 // previous declarations. 3453 OuterContext = OuterContext->getEnclosingNamespaceContext(); 3454 PrevOuterContext = PrevOuterContext->getEnclosingNamespaceContext(); 3455 3456 // The previous declaration is in a different namespace, so it 3457 // isn't the same function. 3458 if (!OuterContext->Equals(PrevOuterContext)) 3459 return false; 3460 } 3461 3462 return true; 3463} 3464 3465static void SetNestedNameSpecifier(DeclaratorDecl *DD, Declarator &D) { 3466 CXXScopeSpec &SS = D.getCXXScopeSpec(); 3467 if (!SS.isSet()) return; 3468 DD->setQualifierInfo(SS.getWithLocInContext(DD->getASTContext())); 3469} 3470 3471NamedDecl* 3472Sema::ActOnVariableDeclarator(Scope *S, Declarator &D, DeclContext *DC, 3473 QualType R, TypeSourceInfo *TInfo, 3474 LookupResult &Previous, 3475 MultiTemplateParamsArg TemplateParamLists, 3476 bool &Redeclaration) { 3477 DeclarationName Name = GetNameForDeclarator(D).getName(); 3478 3479 // Check that there are no default arguments (C++ only). 3480 if (getLangOptions().CPlusPlus) 3481 CheckExtraCXXDefaultArguments(D); 3482 3483 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpec(); 3484 assert(SCSpec != DeclSpec::SCS_typedef && 3485 "Parser allowed 'typedef' as storage class VarDecl."); 3486 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 3487 if (SCSpec == DeclSpec::SCS_mutable) { 3488 // mutable can only appear on non-static class members, so it's always 3489 // an error here 3490 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 3491 D.setInvalidType(); 3492 SC = SC_None; 3493 } 3494 SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 3495 VarDecl::StorageClass SCAsWritten 3496 = StorageClassSpecToVarDeclStorageClass(SCSpec); 3497 3498 IdentifierInfo *II = Name.getAsIdentifierInfo(); 3499 if (!II) { 3500 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 3501 << Name.getAsString(); 3502 return 0; 3503 } 3504 3505 DiagnoseFunctionSpecifiers(D); 3506 3507 if (!DC->isRecord() && S->getFnParent() == 0) { 3508 // C99 6.9p2: The storage-class specifiers auto and register shall not 3509 // appear in the declaration specifiers in an external declaration. 3510 if (SC == SC_Auto || SC == SC_Register) { 3511 3512 // If this is a register variable with an asm label specified, then this 3513 // is a GNU extension. 3514 if (SC == SC_Register && D.getAsmLabel()) 3515 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register); 3516 else 3517 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 3518 D.setInvalidType(); 3519 } 3520 } 3521 3522 bool isExplicitSpecialization = false; 3523 VarDecl *NewVD; 3524 if (!getLangOptions().CPlusPlus) { 3525 NewVD = VarDecl::Create(Context, DC, D.getSourceRange().getBegin(), 3526 D.getIdentifierLoc(), II, 3527 R, TInfo, SC, SCAsWritten); 3528 3529 if (D.isInvalidType()) 3530 NewVD->setInvalidDecl(); 3531 } else { 3532 if (DC->isRecord() && !CurContext->isRecord()) { 3533 // This is an out-of-line definition of a static data member. 3534 if (SC == SC_Static) { 3535 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 3536 diag::err_static_out_of_line) 3537 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3538 } else if (SC == SC_None) 3539 SC = SC_Static; 3540 } 3541 if (SC == SC_Static) { 3542 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) { 3543 if (RD->isLocalClass()) 3544 Diag(D.getIdentifierLoc(), 3545 diag::err_static_data_member_not_allowed_in_local_class) 3546 << Name << RD->getDeclName(); 3547 3548 // C++ [class.union]p1: If a union contains a static data member, 3549 // the program is ill-formed. 3550 // 3551 // We also disallow static data members in anonymous structs. 3552 if (CurContext->isRecord() && (RD->isUnion() || !RD->getDeclName())) 3553 Diag(D.getIdentifierLoc(), 3554 diag::err_static_data_member_not_allowed_in_union_or_anon_struct) 3555 << Name << RD->isUnion(); 3556 } 3557 } 3558 3559 // Match up the template parameter lists with the scope specifier, then 3560 // determine whether we have a template or a template specialization. 3561 isExplicitSpecialization = false; 3562 bool Invalid = false; 3563 if (TemplateParameterList *TemplateParams 3564 = MatchTemplateParametersToScopeSpecifier( 3565 D.getDeclSpec().getSourceRange().getBegin(), 3566 D.getIdentifierLoc(), 3567 D.getCXXScopeSpec(), 3568 TemplateParamLists.get(), 3569 TemplateParamLists.size(), 3570 /*never a friend*/ false, 3571 isExplicitSpecialization, 3572 Invalid)) { 3573 if (TemplateParams->size() > 0) { 3574 // There is no such thing as a variable template. 3575 Diag(D.getIdentifierLoc(), diag::err_template_variable) 3576 << II 3577 << SourceRange(TemplateParams->getTemplateLoc(), 3578 TemplateParams->getRAngleLoc()); 3579 return 0; 3580 } else { 3581 // There is an extraneous 'template<>' for this variable. Complain 3582 // about it, but allow the declaration of the variable. 3583 Diag(TemplateParams->getTemplateLoc(), 3584 diag::err_template_variable_noparams) 3585 << II 3586 << SourceRange(TemplateParams->getTemplateLoc(), 3587 TemplateParams->getRAngleLoc()); 3588 } 3589 } 3590 3591 NewVD = VarDecl::Create(Context, DC, D.getSourceRange().getBegin(), 3592 D.getIdentifierLoc(), II, 3593 R, TInfo, SC, SCAsWritten); 3594 3595 // If this decl has an auto type in need of deduction, make a note of the 3596 // Decl so we can diagnose uses of it in its own initializer. 3597 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto && 3598 R->getContainedAutoType()) 3599 ParsingInitForAutoVars.insert(NewVD); 3600 3601 if (D.isInvalidType() || Invalid) 3602 NewVD->setInvalidDecl(); 3603 3604 SetNestedNameSpecifier(NewVD, D); 3605 3606 if (TemplateParamLists.size() > 0 && D.getCXXScopeSpec().isSet()) { 3607 NewVD->setTemplateParameterListsInfo(Context, 3608 TemplateParamLists.size(), 3609 TemplateParamLists.release()); 3610 } 3611 } 3612 3613 if (D.getDeclSpec().isThreadSpecified()) { 3614 if (NewVD->hasLocalStorage()) 3615 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global); 3616 else if (!Context.Target.isTLSSupported()) 3617 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported); 3618 else 3619 NewVD->setThreadSpecified(true); 3620 } 3621 3622 // Set the lexical context. If the declarator has a C++ scope specifier, the 3623 // lexical context will be different from the semantic context. 3624 NewVD->setLexicalDeclContext(CurContext); 3625 3626 // Handle attributes prior to checking for duplicates in MergeVarDecl 3627 ProcessDeclAttributes(S, NewVD, D); 3628 3629 // Handle GNU asm-label extension (encoded as an attribute). 3630 if (Expr *E = (Expr*)D.getAsmLabel()) { 3631 // The parser guarantees this is a string. 3632 StringLiteral *SE = cast<StringLiteral>(E); 3633 llvm::StringRef Label = SE->getString(); 3634 if (S->getFnParent() != 0) { 3635 switch (SC) { 3636 case SC_None: 3637 case SC_Auto: 3638 Diag(E->getExprLoc(), diag::warn_asm_label_on_auto_decl) << Label; 3639 break; 3640 case SC_Register: 3641 if (!Context.Target.isValidGCCRegisterName(Label)) 3642 Diag(E->getExprLoc(), diag::err_asm_unknown_register_name) << Label; 3643 break; 3644 case SC_Static: 3645 case SC_Extern: 3646 case SC_PrivateExtern: 3647 break; 3648 } 3649 } 3650 3651 NewVD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), 3652 Context, Label)); 3653 } 3654 3655 // Diagnose shadowed variables before filtering for scope. 3656 if (!D.getCXXScopeSpec().isSet()) 3657 CheckShadow(S, NewVD, Previous); 3658 3659 // Don't consider existing declarations that are in a different 3660 // scope and are out-of-semantic-context declarations (if the new 3661 // declaration has linkage). 3662 FilterLookupForScope(Previous, DC, S, NewVD->hasLinkage(), 3663 isExplicitSpecialization); 3664 3665 if (!getLangOptions().CPlusPlus) 3666 CheckVariableDeclaration(NewVD, Previous, Redeclaration); 3667 else { 3668 // Merge the decl with the existing one if appropriate. 3669 if (!Previous.empty()) { 3670 if (Previous.isSingleResult() && 3671 isa<FieldDecl>(Previous.getFoundDecl()) && 3672 D.getCXXScopeSpec().isSet()) { 3673 // The user tried to define a non-static data member 3674 // out-of-line (C++ [dcl.meaning]p1). 3675 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 3676 << D.getCXXScopeSpec().getRange(); 3677 Previous.clear(); 3678 NewVD->setInvalidDecl(); 3679 } 3680 } else if (D.getCXXScopeSpec().isSet()) { 3681 // No previous declaration in the qualifying scope. 3682 Diag(D.getIdentifierLoc(), diag::err_no_member) 3683 << Name << computeDeclContext(D.getCXXScopeSpec(), true) 3684 << D.getCXXScopeSpec().getRange(); 3685 NewVD->setInvalidDecl(); 3686 } 3687 3688 CheckVariableDeclaration(NewVD, Previous, Redeclaration); 3689 3690 // This is an explicit specialization of a static data member. Check it. 3691 if (isExplicitSpecialization && !NewVD->isInvalidDecl() && 3692 CheckMemberSpecialization(NewVD, Previous)) 3693 NewVD->setInvalidDecl(); 3694 } 3695 3696 // attributes declared post-definition are currently ignored 3697 // FIXME: This should be handled in attribute merging, not 3698 // here. 3699 if (Previous.isSingleResult()) { 3700 VarDecl *Def = dyn_cast<VarDecl>(Previous.getFoundDecl()); 3701 if (Def && (Def = Def->getDefinition()) && 3702 Def != NewVD && D.hasAttributes()) { 3703 Diag(NewVD->getLocation(), diag::warn_attribute_precede_definition); 3704 Diag(Def->getLocation(), diag::note_previous_definition); 3705 } 3706 } 3707 3708 // If this is a locally-scoped extern C variable, update the map of 3709 // such variables. 3710 if (CurContext->isFunctionOrMethod() && NewVD->isExternC() && 3711 !NewVD->isInvalidDecl()) 3712 RegisterLocallyScopedExternCDecl(NewVD, Previous, S); 3713 3714 // If there's a #pragma GCC visibility in scope, and this isn't a class 3715 // member, set the visibility of this variable. 3716 if (NewVD->getLinkage() == ExternalLinkage && !DC->isRecord()) 3717 AddPushedVisibilityAttribute(NewVD); 3718 3719 MarkUnusedFileScopedDecl(NewVD); 3720 3721 return NewVD; 3722} 3723 3724/// \brief Diagnose variable or built-in function shadowing. Implements 3725/// -Wshadow. 3726/// 3727/// This method is called whenever a VarDecl is added to a "useful" 3728/// scope. 3729/// 3730/// \param S the scope in which the shadowing name is being declared 3731/// \param R the lookup of the name 3732/// 3733void Sema::CheckShadow(Scope *S, VarDecl *D, const LookupResult& R) { 3734 // Return if warning is ignored. 3735 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, R.getNameLoc()) == 3736 Diagnostic::Ignored) 3737 return; 3738 3739 // Don't diagnose declarations at file scope. 3740 if (D->hasGlobalStorage()) 3741 return; 3742 3743 DeclContext *NewDC = D->getDeclContext(); 3744 3745 // Only diagnose if we're shadowing an unambiguous field or variable. 3746 if (R.getResultKind() != LookupResult::Found) 3747 return; 3748 3749 NamedDecl* ShadowedDecl = R.getFoundDecl(); 3750 if (!isa<VarDecl>(ShadowedDecl) && !isa<FieldDecl>(ShadowedDecl)) 3751 return; 3752 3753 // Fields are not shadowed by variables in C++ static methods. 3754 if (isa<FieldDecl>(ShadowedDecl)) 3755 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewDC)) 3756 if (MD->isStatic()) 3757 return; 3758 3759 if (VarDecl *shadowedVar = dyn_cast<VarDecl>(ShadowedDecl)) 3760 if (shadowedVar->isExternC()) { 3761 // For shadowing external vars, make sure that we point to the global 3762 // declaration, not a locally scoped extern declaration. 3763 for (VarDecl::redecl_iterator 3764 I = shadowedVar->redecls_begin(), E = shadowedVar->redecls_end(); 3765 I != E; ++I) 3766 if (I->isFileVarDecl()) { 3767 ShadowedDecl = *I; 3768 break; 3769 } 3770 } 3771 3772 DeclContext *OldDC = ShadowedDecl->getDeclContext(); 3773 3774 // Only warn about certain kinds of shadowing for class members. 3775 if (NewDC && NewDC->isRecord()) { 3776 // In particular, don't warn about shadowing non-class members. 3777 if (!OldDC->isRecord()) 3778 return; 3779 3780 // TODO: should we warn about static data members shadowing 3781 // static data members from base classes? 3782 3783 // TODO: don't diagnose for inaccessible shadowed members. 3784 // This is hard to do perfectly because we might friend the 3785 // shadowing context, but that's just a false negative. 3786 } 3787 3788 // Determine what kind of declaration we're shadowing. 3789 unsigned Kind; 3790 if (isa<RecordDecl>(OldDC)) { 3791 if (isa<FieldDecl>(ShadowedDecl)) 3792 Kind = 3; // field 3793 else 3794 Kind = 2; // static data member 3795 } else if (OldDC->isFileContext()) 3796 Kind = 1; // global 3797 else 3798 Kind = 0; // local 3799 3800 DeclarationName Name = R.getLookupName(); 3801 3802 // Emit warning and note. 3803 Diag(R.getNameLoc(), diag::warn_decl_shadow) << Name << Kind << OldDC; 3804 Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration); 3805} 3806 3807/// \brief Check -Wshadow without the advantage of a previous lookup. 3808void Sema::CheckShadow(Scope *S, VarDecl *D) { 3809 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, D->getLocation()) == 3810 Diagnostic::Ignored) 3811 return; 3812 3813 LookupResult R(*this, D->getDeclName(), D->getLocation(), 3814 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 3815 LookupName(R, S); 3816 CheckShadow(S, D, R); 3817} 3818 3819/// \brief Perform semantic checking on a newly-created variable 3820/// declaration. 3821/// 3822/// This routine performs all of the type-checking required for a 3823/// variable declaration once it has been built. It is used both to 3824/// check variables after they have been parsed and their declarators 3825/// have been translated into a declaration, and to check variables 3826/// that have been instantiated from a template. 3827/// 3828/// Sets NewVD->isInvalidDecl() if an error was encountered. 3829void Sema::CheckVariableDeclaration(VarDecl *NewVD, 3830 LookupResult &Previous, 3831 bool &Redeclaration) { 3832 // If the decl is already known invalid, don't check it. 3833 if (NewVD->isInvalidDecl()) 3834 return; 3835 3836 QualType T = NewVD->getType(); 3837 3838 if (T->isObjCObjectType()) { 3839 Diag(NewVD->getLocation(), diag::err_statically_allocated_object); 3840 return NewVD->setInvalidDecl(); 3841 } 3842 3843 // Emit an error if an address space was applied to decl with local storage. 3844 // This includes arrays of objects with address space qualifiers, but not 3845 // automatic variables that point to other address spaces. 3846 // ISO/IEC TR 18037 S5.1.2 3847 if (NewVD->hasLocalStorage() && T.getAddressSpace() != 0) { 3848 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 3849 return NewVD->setInvalidDecl(); 3850 } 3851 3852 if (NewVD->hasLocalStorage() && T.isObjCGCWeak() 3853 && !NewVD->hasAttr<BlocksAttr>()) 3854 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 3855 3856 bool isVM = T->isVariablyModifiedType(); 3857 if (isVM || NewVD->hasAttr<CleanupAttr>() || 3858 NewVD->hasAttr<BlocksAttr>()) 3859 getCurFunction()->setHasBranchProtectedScope(); 3860 3861 if ((isVM && NewVD->hasLinkage()) || 3862 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { 3863 bool SizeIsNegative; 3864 llvm::APSInt Oversized; 3865 QualType FixedTy = 3866 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 3867 Oversized); 3868 3869 if (FixedTy.isNull() && T->isVariableArrayType()) { 3870 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 3871 // FIXME: This won't give the correct result for 3872 // int a[10][n]; 3873 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 3874 3875 if (NewVD->isFileVarDecl()) 3876 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 3877 << SizeRange; 3878 else if (NewVD->getStorageClass() == SC_Static) 3879 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 3880 << SizeRange; 3881 else 3882 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 3883 << SizeRange; 3884 return NewVD->setInvalidDecl(); 3885 } 3886 3887 if (FixedTy.isNull()) { 3888 if (NewVD->isFileVarDecl()) 3889 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 3890 else 3891 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 3892 return NewVD->setInvalidDecl(); 3893 } 3894 3895 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 3896 NewVD->setType(FixedTy); 3897 } 3898 3899 if (Previous.empty() && NewVD->isExternC()) { 3900 // Since we did not find anything by this name and we're declaring 3901 // an extern "C" variable, look for a non-visible extern "C" 3902 // declaration with the same name. 3903 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3904 = LocallyScopedExternalDecls.find(NewVD->getDeclName()); 3905 if (Pos != LocallyScopedExternalDecls.end()) 3906 Previous.addDecl(Pos->second); 3907 } 3908 3909 if (T->isVoidType() && !NewVD->hasExternalStorage()) { 3910 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 3911 << T; 3912 return NewVD->setInvalidDecl(); 3913 } 3914 3915 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { 3916 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); 3917 return NewVD->setInvalidDecl(); 3918 } 3919 3920 if (isVM && NewVD->hasAttr<BlocksAttr>()) { 3921 Diag(NewVD->getLocation(), diag::err_block_on_vm); 3922 return NewVD->setInvalidDecl(); 3923 } 3924 3925 // Function pointers and references cannot have qualified function type, only 3926 // function pointer-to-members can do that. 3927 QualType Pointee; 3928 unsigned PtrOrRef = 0; 3929 if (const PointerType *Ptr = T->getAs<PointerType>()) 3930 Pointee = Ptr->getPointeeType(); 3931 else if (const ReferenceType *Ref = T->getAs<ReferenceType>()) { 3932 Pointee = Ref->getPointeeType(); 3933 PtrOrRef = 1; 3934 } 3935 if (!Pointee.isNull() && Pointee->isFunctionProtoType() && 3936 Pointee->getAs<FunctionProtoType>()->getTypeQuals() != 0) { 3937 Diag(NewVD->getLocation(), diag::err_invalid_qualified_function_pointer) 3938 << PtrOrRef; 3939 return NewVD->setInvalidDecl(); 3940 } 3941 3942 if (!Previous.empty()) { 3943 Redeclaration = true; 3944 MergeVarDecl(NewVD, Previous); 3945 } 3946} 3947 3948/// \brief Data used with FindOverriddenMethod 3949struct FindOverriddenMethodData { 3950 Sema *S; 3951 CXXMethodDecl *Method; 3952}; 3953 3954/// \brief Member lookup function that determines whether a given C++ 3955/// method overrides a method in a base class, to be used with 3956/// CXXRecordDecl::lookupInBases(). 3957static bool FindOverriddenMethod(const CXXBaseSpecifier *Specifier, 3958 CXXBasePath &Path, 3959 void *UserData) { 3960 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 3961 3962 FindOverriddenMethodData *Data 3963 = reinterpret_cast<FindOverriddenMethodData*>(UserData); 3964 3965 DeclarationName Name = Data->Method->getDeclName(); 3966 3967 // FIXME: Do we care about other names here too? 3968 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 3969 // We really want to find the base class destructor here. 3970 QualType T = Data->S->Context.getTypeDeclType(BaseRecord); 3971 CanQualType CT = Data->S->Context.getCanonicalType(T); 3972 3973 Name = Data->S->Context.DeclarationNames.getCXXDestructorName(CT); 3974 } 3975 3976 for (Path.Decls = BaseRecord->lookup(Name); 3977 Path.Decls.first != Path.Decls.second; 3978 ++Path.Decls.first) { 3979 NamedDecl *D = *Path.Decls.first; 3980 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 3981 if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD, false)) 3982 return true; 3983 } 3984 } 3985 3986 return false; 3987} 3988 3989/// AddOverriddenMethods - See if a method overrides any in the base classes, 3990/// and if so, check that it's a valid override and remember it. 3991bool Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 3992 // Look for virtual methods in base classes that this method might override. 3993 CXXBasePaths Paths; 3994 FindOverriddenMethodData Data; 3995 Data.Method = MD; 3996 Data.S = this; 3997 bool AddedAny = false; 3998 if (DC->lookupInBases(&FindOverriddenMethod, &Data, Paths)) { 3999 for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(), 4000 E = Paths.found_decls_end(); I != E; ++I) { 4001 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) { 4002 if (!CheckOverridingFunctionReturnType(MD, OldMD) && 4003 !CheckOverridingFunctionExceptionSpec(MD, OldMD) && 4004 !CheckIfOverriddenFunctionIsMarkedFinal(MD, OldMD)) { 4005 MD->addOverriddenMethod(OldMD->getCanonicalDecl()); 4006 AddedAny = true; 4007 } 4008 } 4009 } 4010 } 4011 4012 return AddedAny; 4013} 4014 4015static void DiagnoseInvalidRedeclaration(Sema &S, FunctionDecl *NewFD) { 4016 LookupResult Prev(S, NewFD->getDeclName(), NewFD->getLocation(), 4017 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4018 S.LookupQualifiedName(Prev, NewFD->getDeclContext()); 4019 assert(!Prev.isAmbiguous() && 4020 "Cannot have an ambiguity in previous-declaration lookup"); 4021 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 4022 Func != FuncEnd; ++Func) { 4023 if (isa<FunctionDecl>(*Func) && 4024 isNearlyMatchingFunction(S.Context, cast<FunctionDecl>(*Func), NewFD)) 4025 S.Diag((*Func)->getLocation(), diag::note_member_def_close_match); 4026 } 4027} 4028 4029NamedDecl* 4030Sema::ActOnFunctionDeclarator(Scope* S, Declarator& D, DeclContext* DC, 4031 QualType R, TypeSourceInfo *TInfo, 4032 LookupResult &Previous, 4033 MultiTemplateParamsArg TemplateParamLists, 4034 bool IsFunctionDefinition, bool &Redeclaration) { 4035 assert(R.getTypePtr()->isFunctionType()); 4036 4037 // TODO: consider using NameInfo for diagnostic. 4038 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 4039 DeclarationName Name = NameInfo.getName(); 4040 FunctionDecl::StorageClass SC = SC_None; 4041 switch (D.getDeclSpec().getStorageClassSpec()) { 4042 default: assert(0 && "Unknown storage class!"); 4043 case DeclSpec::SCS_auto: 4044 case DeclSpec::SCS_register: 4045 case DeclSpec::SCS_mutable: 4046 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4047 diag::err_typecheck_sclass_func); 4048 D.setInvalidType(); 4049 break; 4050 case DeclSpec::SCS_unspecified: SC = SC_None; break; 4051 case DeclSpec::SCS_extern: SC = SC_Extern; break; 4052 case DeclSpec::SCS_static: { 4053 if (CurContext->getRedeclContext()->isFunctionOrMethod()) { 4054 // C99 6.7.1p5: 4055 // The declaration of an identifier for a function that has 4056 // block scope shall have no explicit storage-class specifier 4057 // other than extern 4058 // See also (C++ [dcl.stc]p4). 4059 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4060 diag::err_static_block_func); 4061 SC = SC_None; 4062 } else 4063 SC = SC_Static; 4064 break; 4065 } 4066 case DeclSpec::SCS_private_extern: SC = SC_PrivateExtern; break; 4067 } 4068 4069 if (D.getDeclSpec().isThreadSpecified()) 4070 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 4071 4072 // Do not allow returning a objc interface by-value. 4073 if (R->getAs<FunctionType>()->getResultType()->isObjCObjectType()) { 4074 Diag(D.getIdentifierLoc(), 4075 diag::err_object_cannot_be_passed_returned_by_value) << 0 4076 << R->getAs<FunctionType>()->getResultType(); 4077 D.setInvalidType(); 4078 } 4079 4080 FunctionDecl *NewFD; 4081 bool isInline = D.getDeclSpec().isInlineSpecified(); 4082 bool isFriend = false; 4083 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 4084 FunctionDecl::StorageClass SCAsWritten 4085 = StorageClassSpecToFunctionDeclStorageClass(SCSpec); 4086 FunctionTemplateDecl *FunctionTemplate = 0; 4087 bool isExplicitSpecialization = false; 4088 bool isFunctionTemplateSpecialization = false; 4089 4090 if (!getLangOptions().CPlusPlus) { 4091 // Determine whether the function was written with a 4092 // prototype. This true when: 4093 // - there is a prototype in the declarator, or 4094 // - the type R of the function is some kind of typedef or other reference 4095 // to a type name (which eventually refers to a function type). 4096 bool HasPrototype = 4097 (D.isFunctionDeclarator() && D.getFunctionTypeInfo().hasPrototype) || 4098 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 4099 4100 NewFD = FunctionDecl::Create(Context, DC, D.getSourceRange().getBegin(), 4101 NameInfo, R, TInfo, SC, SCAsWritten, isInline, 4102 HasPrototype); 4103 if (D.isInvalidType()) 4104 NewFD->setInvalidDecl(); 4105 4106 // Set the lexical context. 4107 NewFD->setLexicalDeclContext(CurContext); 4108 // Filter out previous declarations that don't match the scope. 4109 FilterLookupForScope(Previous, DC, S, NewFD->hasLinkage(), 4110 /*ExplicitInstantiationOrSpecialization=*/false); 4111 } else { 4112 isFriend = D.getDeclSpec().isFriendSpecified(); 4113 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 4114 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 4115 bool isVirtualOkay = false; 4116 4117 // Check that the return type is not an abstract class type. 4118 // For record types, this is done by the AbstractClassUsageDiagnoser once 4119 // the class has been completely parsed. 4120 if (!DC->isRecord() && 4121 RequireNonAbstractType(D.getIdentifierLoc(), 4122 R->getAs<FunctionType>()->getResultType(), 4123 diag::err_abstract_type_in_decl, 4124 AbstractReturnType)) 4125 D.setInvalidType(); 4126 4127 if (Name.getNameKind() == DeclarationName::CXXConstructorName) { 4128 // This is a C++ constructor declaration. 4129 assert(DC->isRecord() && 4130 "Constructors can only be declared in a member context"); 4131 4132 R = CheckConstructorDeclarator(D, R, SC); 4133 4134 // Create the new declaration 4135 CXXConstructorDecl *NewCD = CXXConstructorDecl::Create( 4136 Context, 4137 cast<CXXRecordDecl>(DC), 4138 D.getSourceRange().getBegin(), 4139 NameInfo, R, TInfo, 4140 isExplicit, isInline, 4141 /*isImplicitlyDeclared=*/false); 4142 4143 NewFD = NewCD; 4144 } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4145 // This is a C++ destructor declaration. 4146 if (DC->isRecord()) { 4147 R = CheckDestructorDeclarator(D, R, SC); 4148 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 4149 4150 CXXDestructorDecl *NewDD = CXXDestructorDecl::Create(Context, Record, 4151 D.getSourceRange().getBegin(), 4152 NameInfo, R, TInfo, 4153 isInline, 4154 /*isImplicitlyDeclared=*/false); 4155 NewFD = NewDD; 4156 isVirtualOkay = true; 4157 4158 // If the class is complete, then we now create the implicit exception 4159 // specification. If the class is incomplete or dependent, we can't do 4160 // it yet. 4161 if (getLangOptions().CPlusPlus0x && !Record->isDependentType() && 4162 Record->getDefinition() && !Record->isBeingDefined() && 4163 R->getAs<FunctionProtoType>()->getExceptionSpecType() == EST_None) { 4164 AdjustDestructorExceptionSpec(Record, NewDD); 4165 } 4166 4167 } else { 4168 Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 4169 4170 // Create a FunctionDecl to satisfy the function definition parsing 4171 // code path. 4172 NewFD = FunctionDecl::Create(Context, DC, D.getSourceRange().getBegin(), 4173 D.getIdentifierLoc(), Name, R, TInfo, 4174 SC, SCAsWritten, isInline, 4175 /*hasPrototype=*/true); 4176 D.setInvalidType(); 4177 } 4178 } else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) { 4179 if (!DC->isRecord()) { 4180 Diag(D.getIdentifierLoc(), 4181 diag::err_conv_function_not_member); 4182 return 0; 4183 } 4184 4185 CheckConversionDeclarator(D, R, SC); 4186 NewFD = CXXConversionDecl::Create(Context, cast<CXXRecordDecl>(DC), 4187 D.getSourceRange().getBegin(), 4188 NameInfo, R, TInfo, 4189 isInline, isExplicit, 4190 SourceLocation()); 4191 4192 isVirtualOkay = true; 4193 } else if (DC->isRecord()) { 4194 // If the of the function is the same as the name of the record, then this 4195 // must be an invalid constructor that has a return type. 4196 // (The parser checks for a return type and makes the declarator a 4197 // constructor if it has no return type). 4198 // must have an invalid constructor that has a return type 4199 if (Name.getAsIdentifierInfo() && 4200 Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ 4201 Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 4202 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 4203 << SourceRange(D.getIdentifierLoc()); 4204 return 0; 4205 } 4206 4207 bool isStatic = SC == SC_Static; 4208 4209 // [class.free]p1: 4210 // Any allocation function for a class T is a static member 4211 // (even if not explicitly declared static). 4212 if (Name.getCXXOverloadedOperator() == OO_New || 4213 Name.getCXXOverloadedOperator() == OO_Array_New) 4214 isStatic = true; 4215 4216 // [class.free]p6 Any deallocation function for a class X is a static member 4217 // (even if not explicitly declared static). 4218 if (Name.getCXXOverloadedOperator() == OO_Delete || 4219 Name.getCXXOverloadedOperator() == OO_Array_Delete) 4220 isStatic = true; 4221 4222 // This is a C++ method declaration. 4223 CXXMethodDecl *NewMD = CXXMethodDecl::Create( 4224 Context, cast<CXXRecordDecl>(DC), 4225 D.getSourceRange().getBegin(), 4226 NameInfo, R, TInfo, 4227 isStatic, SCAsWritten, isInline, 4228 SourceLocation()); 4229 NewFD = NewMD; 4230 4231 isVirtualOkay = !isStatic; 4232 } else { 4233 // Determine whether the function was written with a 4234 // prototype. This true when: 4235 // - we're in C++ (where every function has a prototype), 4236 NewFD = FunctionDecl::Create(Context, DC, D.getSourceRange().getBegin(), 4237 NameInfo, R, TInfo, SC, SCAsWritten, isInline, 4238 true/*HasPrototype*/); 4239 } 4240 4241 if (isFriend && !isInline && IsFunctionDefinition) { 4242 // C++ [class.friend]p5 4243 // A function can be defined in a friend declaration of a 4244 // class . . . . Such a function is implicitly inline. 4245 NewFD->setImplicitlyInline(); 4246 } 4247 4248 SetNestedNameSpecifier(NewFD, D); 4249 isExplicitSpecialization = false; 4250 isFunctionTemplateSpecialization = false; 4251 if (D.isInvalidType()) 4252 NewFD->setInvalidDecl(); 4253 4254 // Set the lexical context. If the declarator has a C++ 4255 // scope specifier, or is the object of a friend declaration, the 4256 // lexical context will be different from the semantic context. 4257 NewFD->setLexicalDeclContext(CurContext); 4258 4259 // Match up the template parameter lists with the scope specifier, then 4260 // determine whether we have a template or a template specialization. 4261 bool Invalid = false; 4262 if (TemplateParameterList *TemplateParams 4263 = MatchTemplateParametersToScopeSpecifier( 4264 D.getDeclSpec().getSourceRange().getBegin(), 4265 D.getIdentifierLoc(), 4266 D.getCXXScopeSpec(), 4267 TemplateParamLists.get(), 4268 TemplateParamLists.size(), 4269 isFriend, 4270 isExplicitSpecialization, 4271 Invalid)) { 4272 if (TemplateParams->size() > 0) { 4273 // This is a function template 4274 4275 // Check that we can declare a template here. 4276 if (CheckTemplateDeclScope(S, TemplateParams)) 4277 return 0; 4278 4279 // A destructor cannot be a template. 4280 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4281 Diag(NewFD->getLocation(), diag::err_destructor_template); 4282 return 0; 4283 } 4284 4285 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC, 4286 NewFD->getLocation(), 4287 Name, TemplateParams, 4288 NewFD); 4289 FunctionTemplate->setLexicalDeclContext(CurContext); 4290 NewFD->setDescribedFunctionTemplate(FunctionTemplate); 4291 4292 // For source fidelity, store the other template param lists. 4293 if (TemplateParamLists.size() > 1) { 4294 NewFD->setTemplateParameterListsInfo(Context, 4295 TemplateParamLists.size() - 1, 4296 TemplateParamLists.release()); 4297 } 4298 } else { 4299 // This is a function template specialization. 4300 isFunctionTemplateSpecialization = true; 4301 // For source fidelity, store all the template param lists. 4302 NewFD->setTemplateParameterListsInfo(Context, 4303 TemplateParamLists.size(), 4304 TemplateParamLists.release()); 4305 4306 // C++0x [temp.expl.spec]p20 forbids "template<> friend void foo(int);". 4307 if (isFriend) { 4308 // We want to remove the "template<>", found here. 4309 SourceRange RemoveRange = TemplateParams->getSourceRange(); 4310 4311 // If we remove the template<> and the name is not a 4312 // template-id, we're actually silently creating a problem: 4313 // the friend declaration will refer to an untemplated decl, 4314 // and clearly the user wants a template specialization. So 4315 // we need to insert '<>' after the name. 4316 SourceLocation InsertLoc; 4317 if (D.getName().getKind() != UnqualifiedId::IK_TemplateId) { 4318 InsertLoc = D.getName().getSourceRange().getEnd(); 4319 InsertLoc = PP.getLocForEndOfToken(InsertLoc); 4320 } 4321 4322 Diag(D.getIdentifierLoc(), diag::err_template_spec_decl_friend) 4323 << Name << RemoveRange 4324 << FixItHint::CreateRemoval(RemoveRange) 4325 << FixItHint::CreateInsertion(InsertLoc, "<>"); 4326 } 4327 } 4328 } 4329 else { 4330 // All template param lists were matched against the scope specifier: 4331 // this is NOT (an explicit specialization of) a template. 4332 if (TemplateParamLists.size() > 0) 4333 // For source fidelity, store all the template param lists. 4334 NewFD->setTemplateParameterListsInfo(Context, 4335 TemplateParamLists.size(), 4336 TemplateParamLists.release()); 4337 } 4338 4339 if (Invalid) { 4340 NewFD->setInvalidDecl(); 4341 if (FunctionTemplate) 4342 FunctionTemplate->setInvalidDecl(); 4343 } 4344 4345 // C++ [dcl.fct.spec]p5: 4346 // The virtual specifier shall only be used in declarations of 4347 // nonstatic class member functions that appear within a 4348 // member-specification of a class declaration; see 10.3. 4349 // 4350 if (isVirtual && !NewFD->isInvalidDecl()) { 4351 if (!isVirtualOkay) { 4352 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4353 diag::err_virtual_non_function); 4354 } else if (!CurContext->isRecord()) { 4355 // 'virtual' was specified outside of the class. 4356 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4357 diag::err_virtual_out_of_class) 4358 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 4359 } else if (NewFD->getDescribedFunctionTemplate()) { 4360 // C++ [temp.mem]p3: 4361 // A member function template shall not be virtual. 4362 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4363 diag::err_virtual_member_function_template) 4364 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 4365 } else { 4366 // Okay: Add virtual to the method. 4367 NewFD->setVirtualAsWritten(true); 4368 } 4369 } 4370 4371 // C++ [dcl.fct.spec]p3: 4372 // The inline specifier shall not appear on a block scope function declaration. 4373 if (isInline && !NewFD->isInvalidDecl()) { 4374 if (CurContext->isFunctionOrMethod()) { 4375 // 'inline' is not allowed on block scope function declaration. 4376 Diag(D.getDeclSpec().getInlineSpecLoc(), 4377 diag::err_inline_declaration_block_scope) << Name 4378 << FixItHint::CreateRemoval(D.getDeclSpec().getInlineSpecLoc()); 4379 } 4380 } 4381 4382 // C++ [dcl.fct.spec]p6: 4383 // The explicit specifier shall be used only in the declaration of a 4384 // constructor or conversion function within its class definition; see 12.3.1 4385 // and 12.3.2. 4386 if (isExplicit && !NewFD->isInvalidDecl()) { 4387 if (!CurContext->isRecord()) { 4388 // 'explicit' was specified outside of the class. 4389 Diag(D.getDeclSpec().getExplicitSpecLoc(), 4390 diag::err_explicit_out_of_class) 4391 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 4392 } else if (!isa<CXXConstructorDecl>(NewFD) && 4393 !isa<CXXConversionDecl>(NewFD)) { 4394 // 'explicit' was specified on a function that wasn't a constructor 4395 // or conversion function. 4396 Diag(D.getDeclSpec().getExplicitSpecLoc(), 4397 diag::err_explicit_non_ctor_or_conv_function) 4398 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 4399 } 4400 } 4401 4402 // Filter out previous declarations that don't match the scope. 4403 FilterLookupForScope(Previous, DC, S, NewFD->hasLinkage(), 4404 isExplicitSpecialization || 4405 isFunctionTemplateSpecialization); 4406 4407 if (isFriend) { 4408 // For now, claim that the objects have no previous declaration. 4409 if (FunctionTemplate) { 4410 FunctionTemplate->setObjectOfFriendDecl(false); 4411 FunctionTemplate->setAccess(AS_public); 4412 } 4413 NewFD->setObjectOfFriendDecl(false); 4414 NewFD->setAccess(AS_public); 4415 } 4416 4417 if (isa<CXXMethodDecl>(NewFD) && DC == CurContext && IsFunctionDefinition) { 4418 // A method is implicitly inline if it's defined in its class 4419 // definition. 4420 NewFD->setImplicitlyInline(); 4421 } 4422 4423 if (SC == SC_Static && isa<CXXMethodDecl>(NewFD) && 4424 !CurContext->isRecord()) { 4425 // C++ [class.static]p1: 4426 // A data or function member of a class may be declared static 4427 // in a class definition, in which case it is a static member of 4428 // the class. 4429 4430 // Complain about the 'static' specifier if it's on an out-of-line 4431 // member function definition. 4432 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4433 diag::err_static_out_of_line) 4434 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 4435 } 4436 } 4437 4438 // Handle GNU asm-label extension (encoded as an attribute). 4439 if (Expr *E = (Expr*) D.getAsmLabel()) { 4440 // The parser guarantees this is a string. 4441 StringLiteral *SE = cast<StringLiteral>(E); 4442 NewFD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), Context, 4443 SE->getString())); 4444 } 4445 4446 // Copy the parameter declarations from the declarator D to the function 4447 // declaration NewFD, if they are available. First scavenge them into Params. 4448 llvm::SmallVector<ParmVarDecl*, 16> Params; 4449 if (D.isFunctionDeclarator()) { 4450 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 4451 4452 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 4453 // function that takes no arguments, not a function that takes a 4454 // single void argument. 4455 // We let through "const void" here because Sema::GetTypeForDeclarator 4456 // already checks for that case. 4457 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 4458 FTI.ArgInfo[0].Param && 4459 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()) { 4460 // Empty arg list, don't push any params. 4461 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[0].Param); 4462 4463 // In C++, the empty parameter-type-list must be spelled "void"; a 4464 // typedef of void is not permitted. 4465 if (getLangOptions().CPlusPlus && 4466 Param->getType().getUnqualifiedType() != Context.VoidTy) { 4467 bool IsTypeAlias = false; 4468 if (const TypedefType *TT = Param->getType()->getAs<TypedefType>()) 4469 IsTypeAlias = isa<TypeAliasDecl>(TT->getDecl()); 4470 else if (const TemplateSpecializationType *TST = 4471 Param->getType()->getAs<TemplateSpecializationType>()) 4472 IsTypeAlias = TST->isTypeAlias(); 4473 Diag(Param->getLocation(), diag::err_param_typedef_of_void) 4474 << IsTypeAlias; 4475 } 4476 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 4477 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 4478 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 4479 assert(Param->getDeclContext() != NewFD && "Was set before ?"); 4480 Param->setDeclContext(NewFD); 4481 Params.push_back(Param); 4482 4483 if (Param->isInvalidDecl()) 4484 NewFD->setInvalidDecl(); 4485 } 4486 } 4487 4488 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) { 4489 // When we're declaring a function with a typedef, typeof, etc as in the 4490 // following example, we'll need to synthesize (unnamed) 4491 // parameters for use in the declaration. 4492 // 4493 // @code 4494 // typedef void fn(int); 4495 // fn f; 4496 // @endcode 4497 4498 // Synthesize a parameter for each argument type. 4499 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 4500 AE = FT->arg_type_end(); AI != AE; ++AI) { 4501 ParmVarDecl *Param = 4502 BuildParmVarDeclForTypedef(NewFD, D.getIdentifierLoc(), *AI); 4503 Param->setScopeInfo(0, Params.size()); 4504 Params.push_back(Param); 4505 } 4506 } else { 4507 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && 4508 "Should not need args for typedef of non-prototype fn"); 4509 } 4510 // Finally, we know we have the right number of parameters, install them. 4511 NewFD->setParams(Params.data(), Params.size()); 4512 4513 // Process the non-inheritable attributes on this declaration. 4514 ProcessDeclAttributes(S, NewFD, D, 4515 /*NonInheritable=*/true, /*Inheritable=*/false); 4516 4517 if (!getLangOptions().CPlusPlus) { 4518 // Perform semantic checking on the function declaration. 4519 bool isExplctSpecialization=false; 4520 CheckFunctionDeclaration(S, NewFD, Previous, isExplctSpecialization, 4521 Redeclaration); 4522 assert((NewFD->isInvalidDecl() || !Redeclaration || 4523 Previous.getResultKind() != LookupResult::FoundOverloaded) && 4524 "previous declaration set still overloaded"); 4525 } else { 4526 // If the declarator is a template-id, translate the parser's template 4527 // argument list into our AST format. 4528 bool HasExplicitTemplateArgs = false; 4529 TemplateArgumentListInfo TemplateArgs; 4530 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) { 4531 TemplateIdAnnotation *TemplateId = D.getName().TemplateId; 4532 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc); 4533 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc); 4534 ASTTemplateArgsPtr TemplateArgsPtr(*this, 4535 TemplateId->getTemplateArgs(), 4536 TemplateId->NumArgs); 4537 translateTemplateArguments(TemplateArgsPtr, 4538 TemplateArgs); 4539 TemplateArgsPtr.release(); 4540 4541 HasExplicitTemplateArgs = true; 4542 4543 if (FunctionTemplate) { 4544 // Function template with explicit template arguments. 4545 Diag(D.getIdentifierLoc(), diag::err_function_template_partial_spec) 4546 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc); 4547 4548 HasExplicitTemplateArgs = false; 4549 } else if (!isFunctionTemplateSpecialization && 4550 !D.getDeclSpec().isFriendSpecified()) { 4551 // We have encountered something that the user meant to be a 4552 // specialization (because it has explicitly-specified template 4553 // arguments) but that was not introduced with a "template<>" (or had 4554 // too few of them). 4555 Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header) 4556 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc) 4557 << FixItHint::CreateInsertion( 4558 D.getDeclSpec().getSourceRange().getBegin(), 4559 "template<> "); 4560 isFunctionTemplateSpecialization = true; 4561 } else { 4562 // "friend void foo<>(int);" is an implicit specialization decl. 4563 isFunctionTemplateSpecialization = true; 4564 } 4565 } else if (isFriend && isFunctionTemplateSpecialization) { 4566 // This combination is only possible in a recovery case; the user 4567 // wrote something like: 4568 // template <> friend void foo(int); 4569 // which we're recovering from as if the user had written: 4570 // friend void foo<>(int); 4571 // Go ahead and fake up a template id. 4572 HasExplicitTemplateArgs = true; 4573 TemplateArgs.setLAngleLoc(D.getIdentifierLoc()); 4574 TemplateArgs.setRAngleLoc(D.getIdentifierLoc()); 4575 } 4576 4577 // If it's a friend (and only if it's a friend), it's possible 4578 // that either the specialized function type or the specialized 4579 // template is dependent, and therefore matching will fail. In 4580 // this case, don't check the specialization yet. 4581 if (isFunctionTemplateSpecialization && isFriend && 4582 (NewFD->getType()->isDependentType() || DC->isDependentContext())) { 4583 assert(HasExplicitTemplateArgs && 4584 "friend function specialization without template args"); 4585 if (CheckDependentFunctionTemplateSpecialization(NewFD, TemplateArgs, 4586 Previous)) 4587 NewFD->setInvalidDecl(); 4588 } else if (isFunctionTemplateSpecialization) { 4589 if (CurContext->isDependentContext() && CurContext->isRecord() 4590 && !isFriend && !getLangOptions().Microsoft) { 4591 Diag(NewFD->getLocation(), diag::err_function_specialization_in_class) 4592 << NewFD->getDeclName(); 4593 NewFD->setInvalidDecl(); 4594 return 0; 4595 } else if (CheckFunctionTemplateSpecialization(NewFD, 4596 (HasExplicitTemplateArgs ? &TemplateArgs : 0), 4597 Previous)) 4598 NewFD->setInvalidDecl(); 4599 4600 // C++ [dcl.stc]p1: 4601 // A storage-class-specifier shall not be specified in an explicit 4602 // specialization (14.7.3) 4603 if (SC != SC_None) { 4604 Diag(NewFD->getLocation(), 4605 diag::err_explicit_specialization_storage_class) 4606 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 4607 } 4608 4609 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD)) { 4610 if (CheckMemberSpecialization(NewFD, Previous)) 4611 NewFD->setInvalidDecl(); 4612 } 4613 4614 // Perform semantic checking on the function declaration. 4615 CheckFunctionDeclaration(S, NewFD, Previous, isExplicitSpecialization, 4616 Redeclaration); 4617 4618 assert((NewFD->isInvalidDecl() || !Redeclaration || 4619 Previous.getResultKind() != LookupResult::FoundOverloaded) && 4620 "previous declaration set still overloaded"); 4621 4622 NamedDecl *PrincipalDecl = (FunctionTemplate 4623 ? cast<NamedDecl>(FunctionTemplate) 4624 : NewFD); 4625 4626 if (isFriend && Redeclaration) { 4627 AccessSpecifier Access = AS_public; 4628 if (!NewFD->isInvalidDecl()) 4629 Access = NewFD->getPreviousDeclaration()->getAccess(); 4630 4631 NewFD->setAccess(Access); 4632 if (FunctionTemplate) FunctionTemplate->setAccess(Access); 4633 4634 PrincipalDecl->setObjectOfFriendDecl(true); 4635 } 4636 4637 if (NewFD->isOverloadedOperator() && !DC->isRecord() && 4638 PrincipalDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary)) 4639 PrincipalDecl->setNonMemberOperator(); 4640 4641 // If we have a function template, check the template parameter 4642 // list. This will check and merge default template arguments. 4643 if (FunctionTemplate) { 4644 FunctionTemplateDecl *PrevTemplate = FunctionTemplate->getPreviousDeclaration(); 4645 CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(), 4646 PrevTemplate? PrevTemplate->getTemplateParameters() : 0, 4647 D.getDeclSpec().isFriendSpecified() 4648 ? (IsFunctionDefinition 4649 ? TPC_FriendFunctionTemplateDefinition 4650 : TPC_FriendFunctionTemplate) 4651 : (D.getCXXScopeSpec().isSet() && 4652 DC && DC->isRecord() && 4653 DC->isDependentContext()) 4654 ? TPC_ClassTemplateMember 4655 : TPC_FunctionTemplate); 4656 } 4657 4658 if (NewFD->isInvalidDecl()) { 4659 // Ignore all the rest of this. 4660 } else if (!Redeclaration) { 4661 // Fake up an access specifier if it's supposed to be a class member. 4662 if (isa<CXXRecordDecl>(NewFD->getDeclContext())) 4663 NewFD->setAccess(AS_public); 4664 4665 // Qualified decls generally require a previous declaration. 4666 if (D.getCXXScopeSpec().isSet()) { 4667 // ...with the major exception of templated-scope or 4668 // dependent-scope friend declarations. 4669 4670 // TODO: we currently also suppress this check in dependent 4671 // contexts because (1) the parameter depth will be off when 4672 // matching friend templates and (2) we might actually be 4673 // selecting a friend based on a dependent factor. But there 4674 // are situations where these conditions don't apply and we 4675 // can actually do this check immediately. 4676 if (isFriend && 4677 (TemplateParamLists.size() || 4678 D.getCXXScopeSpec().getScopeRep()->isDependent() || 4679 CurContext->isDependentContext())) { 4680 // ignore these 4681 } else { 4682 // The user tried to provide an out-of-line definition for a 4683 // function that is a member of a class or namespace, but there 4684 // was no such member function declared (C++ [class.mfct]p2, 4685 // C++ [namespace.memdef]p2). For example: 4686 // 4687 // class X { 4688 // void f() const; 4689 // }; 4690 // 4691 // void X::f() { } // ill-formed 4692 // 4693 // Complain about this problem, and attempt to suggest close 4694 // matches (e.g., those that differ only in cv-qualifiers and 4695 // whether the parameter types are references). 4696 Diag(D.getIdentifierLoc(), diag::err_member_def_does_not_match) 4697 << Name << DC << D.getCXXScopeSpec().getRange(); 4698 NewFD->setInvalidDecl(); 4699 4700 DiagnoseInvalidRedeclaration(*this, NewFD); 4701 } 4702 4703 // Unqualified local friend declarations are required to resolve 4704 // to something. 4705 } else if (isFriend && cast<CXXRecordDecl>(CurContext)->isLocalClass()) { 4706 Diag(D.getIdentifierLoc(), diag::err_no_matching_local_friend); 4707 NewFD->setInvalidDecl(); 4708 DiagnoseInvalidRedeclaration(*this, NewFD); 4709 } 4710 4711 } else if (!IsFunctionDefinition && D.getCXXScopeSpec().isSet() && 4712 !isFriend && !isFunctionTemplateSpecialization && 4713 !isExplicitSpecialization) { 4714 // An out-of-line member function declaration must also be a 4715 // definition (C++ [dcl.meaning]p1). 4716 // Note that this is not the case for explicit specializations of 4717 // function templates or member functions of class templates, per 4718 // C++ [temp.expl.spec]p2. We also allow these declarations as an extension 4719 // for compatibility with old SWIG code which likes to generate them. 4720 Diag(NewFD->getLocation(), diag::ext_out_of_line_declaration) 4721 << D.getCXXScopeSpec().getRange(); 4722 } 4723 } 4724 4725 4726 // Handle attributes. We need to have merged decls when handling attributes 4727 // (for example to check for conflicts, etc). 4728 // FIXME: This needs to happen before we merge declarations. Then, 4729 // let attribute merging cope with attribute conflicts. 4730 ProcessDeclAttributes(S, NewFD, D, 4731 /*NonInheritable=*/false, /*Inheritable=*/true); 4732 4733 // attributes declared post-definition are currently ignored 4734 // FIXME: This should happen during attribute merging 4735 if (Redeclaration && Previous.isSingleResult()) { 4736 const FunctionDecl *Def; 4737 FunctionDecl *PrevFD = dyn_cast<FunctionDecl>(Previous.getFoundDecl()); 4738 if (PrevFD && PrevFD->isDefined(Def) && D.hasAttributes()) { 4739 Diag(NewFD->getLocation(), diag::warn_attribute_precede_definition); 4740 Diag(Def->getLocation(), diag::note_previous_definition); 4741 } 4742 } 4743 4744 AddKnownFunctionAttributes(NewFD); 4745 4746 if (NewFD->hasAttr<OverloadableAttr>() && 4747 !NewFD->getType()->getAs<FunctionProtoType>()) { 4748 Diag(NewFD->getLocation(), 4749 diag::err_attribute_overloadable_no_prototype) 4750 << NewFD; 4751 4752 // Turn this into a variadic function with no parameters. 4753 const FunctionType *FT = NewFD->getType()->getAs<FunctionType>(); 4754 FunctionProtoType::ExtProtoInfo EPI; 4755 EPI.Variadic = true; 4756 EPI.ExtInfo = FT->getExtInfo(); 4757 4758 QualType R = Context.getFunctionType(FT->getResultType(), 0, 0, EPI); 4759 NewFD->setType(R); 4760 } 4761 4762 // If there's a #pragma GCC visibility in scope, and this isn't a class 4763 // member, set the visibility of this function. 4764 if (NewFD->getLinkage() == ExternalLinkage && !DC->isRecord()) 4765 AddPushedVisibilityAttribute(NewFD); 4766 4767 // If this is a locally-scoped extern C function, update the 4768 // map of such names. 4769 if (CurContext->isFunctionOrMethod() && NewFD->isExternC() 4770 && !NewFD->isInvalidDecl()) 4771 RegisterLocallyScopedExternCDecl(NewFD, Previous, S); 4772 4773 // Set this FunctionDecl's range up to the right paren. 4774 NewFD->setRangeEnd(D.getSourceRange().getEnd()); 4775 4776 if (getLangOptions().CPlusPlus) { 4777 if (FunctionTemplate) { 4778 if (NewFD->isInvalidDecl()) 4779 FunctionTemplate->setInvalidDecl(); 4780 return FunctionTemplate; 4781 } 4782 } 4783 4784 MarkUnusedFileScopedDecl(NewFD); 4785 4786 if (getLangOptions().CUDA) 4787 if (IdentifierInfo *II = NewFD->getIdentifier()) 4788 if (!NewFD->isInvalidDecl() && 4789 NewFD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 4790 if (II->isStr("cudaConfigureCall")) { 4791 if (!R->getAs<FunctionType>()->getResultType()->isScalarType()) 4792 Diag(NewFD->getLocation(), diag::err_config_scalar_return); 4793 4794 Context.setcudaConfigureCallDecl(NewFD); 4795 } 4796 } 4797 4798 return NewFD; 4799} 4800 4801/// \brief Perform semantic checking of a new function declaration. 4802/// 4803/// Performs semantic analysis of the new function declaration 4804/// NewFD. This routine performs all semantic checking that does not 4805/// require the actual declarator involved in the declaration, and is 4806/// used both for the declaration of functions as they are parsed 4807/// (called via ActOnDeclarator) and for the declaration of functions 4808/// that have been instantiated via C++ template instantiation (called 4809/// via InstantiateDecl). 4810/// 4811/// \param IsExplicitSpecialiation whether this new function declaration is 4812/// an explicit specialization of the previous declaration. 4813/// 4814/// This sets NewFD->isInvalidDecl() to true if there was an error. 4815void Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD, 4816 LookupResult &Previous, 4817 bool IsExplicitSpecialization, 4818 bool &Redeclaration) { 4819 // If NewFD is already known erroneous, don't do any of this checking. 4820 if (NewFD->isInvalidDecl()) { 4821 // If this is a class member, mark the class invalid immediately. 4822 // This avoids some consistency errors later. 4823 if (isa<CXXMethodDecl>(NewFD)) 4824 cast<CXXMethodDecl>(NewFD)->getParent()->setInvalidDecl(); 4825 4826 return; 4827 } 4828 4829 if (NewFD->getResultType()->isVariablyModifiedType()) { 4830 // Functions returning a variably modified type violate C99 6.7.5.2p2 4831 // because all functions have linkage. 4832 Diag(NewFD->getLocation(), diag::err_vm_func_decl); 4833 return NewFD->setInvalidDecl(); 4834 } 4835 4836 if (NewFD->isMain()) 4837 CheckMain(NewFD); 4838 4839 // Check for a previous declaration of this name. 4840 if (Previous.empty() && NewFD->isExternC()) { 4841 // Since we did not find anything by this name and we're declaring 4842 // an extern "C" function, look for a non-visible extern "C" 4843 // declaration with the same name. 4844 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 4845 = LocallyScopedExternalDecls.find(NewFD->getDeclName()); 4846 if (Pos != LocallyScopedExternalDecls.end()) 4847 Previous.addDecl(Pos->second); 4848 } 4849 4850 // Merge or overload the declaration with an existing declaration of 4851 // the same name, if appropriate. 4852 if (!Previous.empty()) { 4853 // Determine whether NewFD is an overload of PrevDecl or 4854 // a declaration that requires merging. If it's an overload, 4855 // there's no more work to do here; we'll just add the new 4856 // function to the scope. 4857 4858 NamedDecl *OldDecl = 0; 4859 if (!AllowOverloadingOfFunction(Previous, Context)) { 4860 Redeclaration = true; 4861 OldDecl = Previous.getFoundDecl(); 4862 } else { 4863 switch (CheckOverload(S, NewFD, Previous, OldDecl, 4864 /*NewIsUsingDecl*/ false)) { 4865 case Ovl_Match: 4866 Redeclaration = true; 4867 break; 4868 4869 case Ovl_NonFunction: 4870 Redeclaration = true; 4871 break; 4872 4873 case Ovl_Overload: 4874 Redeclaration = false; 4875 break; 4876 } 4877 4878 if (!getLangOptions().CPlusPlus && !NewFD->hasAttr<OverloadableAttr>()) { 4879 // If a function name is overloadable in C, then every function 4880 // with that name must be marked "overloadable". 4881 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 4882 << Redeclaration << NewFD; 4883 NamedDecl *OverloadedDecl = 0; 4884 if (Redeclaration) 4885 OverloadedDecl = OldDecl; 4886 else if (!Previous.empty()) 4887 OverloadedDecl = Previous.getRepresentativeDecl(); 4888 if (OverloadedDecl) 4889 Diag(OverloadedDecl->getLocation(), 4890 diag::note_attribute_overloadable_prev_overload); 4891 NewFD->addAttr(::new (Context) OverloadableAttr(SourceLocation(), 4892 Context)); 4893 } 4894 } 4895 4896 if (Redeclaration) { 4897 // NewFD and OldDecl represent declarations that need to be 4898 // merged. 4899 if (MergeFunctionDecl(NewFD, OldDecl)) 4900 return NewFD->setInvalidDecl(); 4901 4902 Previous.clear(); 4903 Previous.addDecl(OldDecl); 4904 4905 if (FunctionTemplateDecl *OldTemplateDecl 4906 = dyn_cast<FunctionTemplateDecl>(OldDecl)) { 4907 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl()); 4908 FunctionTemplateDecl *NewTemplateDecl 4909 = NewFD->getDescribedFunctionTemplate(); 4910 assert(NewTemplateDecl && "Template/non-template mismatch"); 4911 if (CXXMethodDecl *Method 4912 = dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) { 4913 Method->setAccess(OldTemplateDecl->getAccess()); 4914 NewTemplateDecl->setAccess(OldTemplateDecl->getAccess()); 4915 } 4916 4917 // If this is an explicit specialization of a member that is a function 4918 // template, mark it as a member specialization. 4919 if (IsExplicitSpecialization && 4920 NewTemplateDecl->getInstantiatedFromMemberTemplate()) { 4921 NewTemplateDecl->setMemberSpecialization(); 4922 assert(OldTemplateDecl->isMemberSpecialization()); 4923 } 4924 } else { 4925 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions 4926 NewFD->setAccess(OldDecl->getAccess()); 4927 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 4928 } 4929 } 4930 } 4931 4932 // Semantic checking for this function declaration (in isolation). 4933 if (getLangOptions().CPlusPlus) { 4934 // C++-specific checks. 4935 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { 4936 CheckConstructor(Constructor); 4937 } else if (CXXDestructorDecl *Destructor = 4938 dyn_cast<CXXDestructorDecl>(NewFD)) { 4939 CXXRecordDecl *Record = Destructor->getParent(); 4940 QualType ClassType = Context.getTypeDeclType(Record); 4941 4942 // FIXME: Shouldn't we be able to perform this check even when the class 4943 // type is dependent? Both gcc and edg can handle that. 4944 if (!ClassType->isDependentType()) { 4945 DeclarationName Name 4946 = Context.DeclarationNames.getCXXDestructorName( 4947 Context.getCanonicalType(ClassType)); 4948 if (NewFD->getDeclName() != Name) { 4949 Diag(NewFD->getLocation(), diag::err_destructor_name); 4950 return NewFD->setInvalidDecl(); 4951 } 4952 } 4953 } else if (CXXConversionDecl *Conversion 4954 = dyn_cast<CXXConversionDecl>(NewFD)) { 4955 ActOnConversionDeclarator(Conversion); 4956 } 4957 4958 // Find any virtual functions that this function overrides. 4959 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) { 4960 if (!Method->isFunctionTemplateSpecialization() && 4961 !Method->getDescribedFunctionTemplate()) { 4962 if (AddOverriddenMethods(Method->getParent(), Method)) { 4963 // If the function was marked as "static", we have a problem. 4964 if (NewFD->getStorageClass() == SC_Static) { 4965 Diag(NewFD->getLocation(), diag::err_static_overrides_virtual) 4966 << NewFD->getDeclName(); 4967 for (CXXMethodDecl::method_iterator 4968 Overridden = Method->begin_overridden_methods(), 4969 OverriddenEnd = Method->end_overridden_methods(); 4970 Overridden != OverriddenEnd; 4971 ++Overridden) { 4972 Diag((*Overridden)->getLocation(), 4973 diag::note_overridden_virtual_function); 4974 } 4975 } 4976 } 4977 } 4978 } 4979 4980 // Extra checking for C++ overloaded operators (C++ [over.oper]). 4981 if (NewFD->isOverloadedOperator() && 4982 CheckOverloadedOperatorDeclaration(NewFD)) 4983 return NewFD->setInvalidDecl(); 4984 4985 // Extra checking for C++0x literal operators (C++0x [over.literal]). 4986 if (NewFD->getLiteralIdentifier() && 4987 CheckLiteralOperatorDeclaration(NewFD)) 4988 return NewFD->setInvalidDecl(); 4989 4990 // In C++, check default arguments now that we have merged decls. Unless 4991 // the lexical context is the class, because in this case this is done 4992 // during delayed parsing anyway. 4993 if (!CurContext->isRecord()) 4994 CheckCXXDefaultArguments(NewFD); 4995 4996 // If this function declares a builtin function, check the type of this 4997 // declaration against the expected type for the builtin. 4998 if (unsigned BuiltinID = NewFD->getBuiltinID()) { 4999 ASTContext::GetBuiltinTypeError Error; 5000 QualType T = Context.GetBuiltinType(BuiltinID, Error); 5001 if (!T.isNull() && !Context.hasSameType(T, NewFD->getType())) { 5002 // The type of this function differs from the type of the builtin, 5003 // so forget about the builtin entirely. 5004 Context.BuiltinInfo.ForgetBuiltin(BuiltinID, Context.Idents); 5005 } 5006 } 5007 } 5008} 5009 5010void Sema::CheckMain(FunctionDecl* FD) { 5011 // C++ [basic.start.main]p3: A program that declares main to be inline 5012 // or static is ill-formed. 5013 // C99 6.7.4p4: In a hosted environment, the inline function specifier 5014 // shall not appear in a declaration of main. 5015 // static main is not an error under C99, but we should warn about it. 5016 bool isInline = FD->isInlineSpecified(); 5017 bool isStatic = FD->getStorageClass() == SC_Static; 5018 if (isInline || isStatic) { 5019 unsigned diagID = diag::warn_unusual_main_decl; 5020 if (isInline || getLangOptions().CPlusPlus) 5021 diagID = diag::err_unusual_main_decl; 5022 5023 int which = isStatic + (isInline << 1) - 1; 5024 Diag(FD->getLocation(), diagID) << which; 5025 } 5026 5027 QualType T = FD->getType(); 5028 assert(T->isFunctionType() && "function decl is not of function type"); 5029 const FunctionType* FT = T->getAs<FunctionType>(); 5030 5031 if (!Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) { 5032 Diag(FD->getTypeSpecStartLoc(), diag::err_main_returns_nonint); 5033 FD->setInvalidDecl(true); 5034 } 5035 5036 // Treat protoless main() as nullary. 5037 if (isa<FunctionNoProtoType>(FT)) return; 5038 5039 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT); 5040 unsigned nparams = FTP->getNumArgs(); 5041 assert(FD->getNumParams() == nparams); 5042 5043 bool HasExtraParameters = (nparams > 3); 5044 5045 // Darwin passes an undocumented fourth argument of type char**. If 5046 // other platforms start sprouting these, the logic below will start 5047 // getting shifty. 5048 if (nparams == 4 && Context.Target.getTriple().isOSDarwin()) 5049 HasExtraParameters = false; 5050 5051 if (HasExtraParameters) { 5052 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams; 5053 FD->setInvalidDecl(true); 5054 nparams = 3; 5055 } 5056 5057 // FIXME: a lot of the following diagnostics would be improved 5058 // if we had some location information about types. 5059 5060 QualType CharPP = 5061 Context.getPointerType(Context.getPointerType(Context.CharTy)); 5062 QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP }; 5063 5064 for (unsigned i = 0; i < nparams; ++i) { 5065 QualType AT = FTP->getArgType(i); 5066 5067 bool mismatch = true; 5068 5069 if (Context.hasSameUnqualifiedType(AT, Expected[i])) 5070 mismatch = false; 5071 else if (Expected[i] == CharPP) { 5072 // As an extension, the following forms are okay: 5073 // char const ** 5074 // char const * const * 5075 // char * const * 5076 5077 QualifierCollector qs; 5078 const PointerType* PT; 5079 if ((PT = qs.strip(AT)->getAs<PointerType>()) && 5080 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) && 5081 (QualType(qs.strip(PT->getPointeeType()), 0) == Context.CharTy)) { 5082 qs.removeConst(); 5083 mismatch = !qs.empty(); 5084 } 5085 } 5086 5087 if (mismatch) { 5088 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i]; 5089 // TODO: suggest replacing given type with expected type 5090 FD->setInvalidDecl(true); 5091 } 5092 } 5093 5094 if (nparams == 1 && !FD->isInvalidDecl()) { 5095 Diag(FD->getLocation(), diag::warn_main_one_arg); 5096 } 5097 5098 if (!FD->isInvalidDecl() && FD->getDescribedFunctionTemplate()) { 5099 Diag(FD->getLocation(), diag::err_main_template_decl); 5100 FD->setInvalidDecl(); 5101 } 5102} 5103 5104bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 5105 // FIXME: Need strict checking. In C89, we need to check for 5106 // any assignment, increment, decrement, function-calls, or 5107 // commas outside of a sizeof. In C99, it's the same list, 5108 // except that the aforementioned are allowed in unevaluated 5109 // expressions. Everything else falls under the 5110 // "may accept other forms of constant expressions" exception. 5111 // (We never end up here for C++, so the constant expression 5112 // rules there don't matter.) 5113 if (Init->isConstantInitializer(Context, false)) 5114 return false; 5115 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 5116 << Init->getSourceRange(); 5117 return true; 5118} 5119 5120namespace { 5121 // Visits an initialization expression to see if OrigDecl is evaluated in 5122 // its own initialization and throws a warning if it does. 5123 class SelfReferenceChecker 5124 : public EvaluatedExprVisitor<SelfReferenceChecker> { 5125 Sema &S; 5126 Decl *OrigDecl; 5127 5128 public: 5129 typedef EvaluatedExprVisitor<SelfReferenceChecker> Inherited; 5130 5131 SelfReferenceChecker(Sema &S, Decl *OrigDecl) : Inherited(S.Context), 5132 S(S), OrigDecl(OrigDecl) { } 5133 5134 void VisitExpr(Expr *E) { 5135 if (isa<ObjCMessageExpr>(*E)) return; 5136 Inherited::VisitExpr(E); 5137 } 5138 5139 void VisitImplicitCastExpr(ImplicitCastExpr *E) { 5140 CheckForSelfReference(E); 5141 Inherited::VisitImplicitCastExpr(E); 5142 } 5143 5144 void CheckForSelfReference(ImplicitCastExpr *E) { 5145 if (E->getCastKind() != CK_LValueToRValue) return; 5146 Expr* SubExpr = E->getSubExpr()->IgnoreParenImpCasts(); 5147 DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(SubExpr); 5148 if (!DRE) return; 5149 Decl* ReferenceDecl = DRE->getDecl(); 5150 if (OrigDecl != ReferenceDecl) return; 5151 LookupResult Result(S, DRE->getNameInfo(), Sema::LookupOrdinaryName, 5152 Sema::NotForRedeclaration); 5153 S.DiagRuntimeBehavior(SubExpr->getLocStart(), SubExpr, 5154 S.PDiag(diag::warn_uninit_self_reference_in_init) 5155 << Result.getLookupName() 5156 << OrigDecl->getLocation() 5157 << SubExpr->getSourceRange()); 5158 } 5159 }; 5160} 5161 5162/// AddInitializerToDecl - Adds the initializer Init to the 5163/// declaration dcl. If DirectInit is true, this is C++ direct 5164/// initialization rather than copy initialization. 5165void Sema::AddInitializerToDecl(Decl *RealDecl, Expr *Init, 5166 bool DirectInit, bool TypeMayContainAuto) { 5167 // If there is no declaration, there was an error parsing it. Just ignore 5168 // the initializer. 5169 if (RealDecl == 0 || RealDecl->isInvalidDecl()) 5170 return; 5171 5172 // Check for self-references within variable initializers. 5173 if (VarDecl *vd = dyn_cast<VarDecl>(RealDecl)) { 5174 // Variables declared within a function/method body are handled 5175 // by a dataflow analysis. 5176 if (!vd->hasLocalStorage() && !vd->isStaticLocal()) 5177 SelfReferenceChecker(*this, RealDecl).VisitExpr(Init); 5178 } 5179 else { 5180 SelfReferenceChecker(*this, RealDecl).VisitExpr(Init); 5181 } 5182 5183 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 5184 // With declarators parsed the way they are, the parser cannot 5185 // distinguish between a normal initializer and a pure-specifier. 5186 // Thus this grotesque test. 5187 IntegerLiteral *IL; 5188 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 5189 Context.getCanonicalType(IL->getType()) == Context.IntTy) 5190 CheckPureMethod(Method, Init->getSourceRange()); 5191 else { 5192 Diag(Method->getLocation(), diag::err_member_function_initialization) 5193 << Method->getDeclName() << Init->getSourceRange(); 5194 Method->setInvalidDecl(); 5195 } 5196 return; 5197 } 5198 5199 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 5200 if (!VDecl) { 5201 if (getLangOptions().CPlusPlus && 5202 RealDecl->getLexicalDeclContext()->isRecord() && 5203 isa<NamedDecl>(RealDecl)) 5204 Diag(RealDecl->getLocation(), diag::err_member_initialization); 5205 else 5206 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 5207 RealDecl->setInvalidDecl(); 5208 return; 5209 } 5210 5211 // C++0x [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 5212 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 5213 TypeSourceInfo *DeducedType = 0; 5214 if (!DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType)) 5215 Diag(VDecl->getLocation(), diag::err_auto_var_deduction_failure) 5216 << VDecl->getDeclName() << VDecl->getType() << Init->getType() 5217 << Init->getSourceRange(); 5218 if (!DeducedType) { 5219 RealDecl->setInvalidDecl(); 5220 return; 5221 } 5222 VDecl->setTypeSourceInfo(DeducedType); 5223 VDecl->setType(DeducedType->getType()); 5224 5225 // If this is a redeclaration, check that the type we just deduced matches 5226 // the previously declared type. 5227 if (VarDecl *Old = VDecl->getPreviousDeclaration()) 5228 MergeVarDeclTypes(VDecl, Old); 5229 } 5230 5231 5232 // A definition must end up with a complete type, which means it must be 5233 // complete with the restriction that an array type might be completed by the 5234 // initializer; note that later code assumes this restriction. 5235 QualType BaseDeclType = VDecl->getType(); 5236 if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType)) 5237 BaseDeclType = Array->getElementType(); 5238 if (RequireCompleteType(VDecl->getLocation(), BaseDeclType, 5239 diag::err_typecheck_decl_incomplete_type)) { 5240 RealDecl->setInvalidDecl(); 5241 return; 5242 } 5243 5244 // The variable can not have an abstract class type. 5245 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 5246 diag::err_abstract_type_in_decl, 5247 AbstractVariableType)) 5248 VDecl->setInvalidDecl(); 5249 5250 const VarDecl *Def; 5251 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 5252 Diag(VDecl->getLocation(), diag::err_redefinition) 5253 << VDecl->getDeclName(); 5254 Diag(Def->getLocation(), diag::note_previous_definition); 5255 VDecl->setInvalidDecl(); 5256 return; 5257 } 5258 5259 const VarDecl* PrevInit = 0; 5260 if (getLangOptions().CPlusPlus) { 5261 // C++ [class.static.data]p4 5262 // If a static data member is of const integral or const 5263 // enumeration type, its declaration in the class definition can 5264 // specify a constant-initializer which shall be an integral 5265 // constant expression (5.19). In that case, the member can appear 5266 // in integral constant expressions. The member shall still be 5267 // defined in a namespace scope if it is used in the program and the 5268 // namespace scope definition shall not contain an initializer. 5269 // 5270 // We already performed a redefinition check above, but for static 5271 // data members we also need to check whether there was an in-class 5272 // declaration with an initializer. 5273 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 5274 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 5275 Diag(PrevInit->getLocation(), diag::note_previous_definition); 5276 return; 5277 } 5278 5279 if (VDecl->hasLocalStorage()) 5280 getCurFunction()->setHasBranchProtectedScope(); 5281 5282 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) { 5283 VDecl->setInvalidDecl(); 5284 return; 5285 } 5286 } 5287 5288 // Capture the variable that is being initialized and the style of 5289 // initialization. 5290 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 5291 5292 // FIXME: Poor source location information. 5293 InitializationKind Kind 5294 = DirectInit? InitializationKind::CreateDirect(VDecl->getLocation(), 5295 Init->getLocStart(), 5296 Init->getLocEnd()) 5297 : InitializationKind::CreateCopy(VDecl->getLocation(), 5298 Init->getLocStart()); 5299 5300 // Get the decls type and save a reference for later, since 5301 // CheckInitializerTypes may change it. 5302 QualType DclT = VDecl->getType(), SavT = DclT; 5303 if (VDecl->isLocalVarDecl()) { 5304 if (VDecl->hasExternalStorage()) { // C99 6.7.8p5 5305 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 5306 VDecl->setInvalidDecl(); 5307 } else if (!VDecl->isInvalidDecl()) { 5308 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 5309 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 5310 MultiExprArg(*this, &Init, 1), 5311 &DclT); 5312 if (Result.isInvalid()) { 5313 VDecl->setInvalidDecl(); 5314 return; 5315 } 5316 5317 Init = Result.takeAs<Expr>(); 5318 5319 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 5320 // Don't check invalid declarations to avoid emitting useless diagnostics. 5321 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 5322 if (VDecl->getStorageClass() == SC_Static) // C99 6.7.8p4. 5323 CheckForConstantInitializer(Init, DclT); 5324 } 5325 } 5326 } else if (VDecl->isStaticDataMember() && 5327 VDecl->getLexicalDeclContext()->isRecord()) { 5328 // This is an in-class initialization for a static data member, e.g., 5329 // 5330 // struct S { 5331 // static const int value = 17; 5332 // }; 5333 5334 // Try to perform the initialization regardless. 5335 if (!VDecl->isInvalidDecl()) { 5336 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 5337 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 5338 MultiExprArg(*this, &Init, 1), 5339 &DclT); 5340 if (Result.isInvalid()) { 5341 VDecl->setInvalidDecl(); 5342 return; 5343 } 5344 5345 Init = Result.takeAs<Expr>(); 5346 } 5347 5348 // C++ [class.mem]p4: 5349 // A member-declarator can contain a constant-initializer only 5350 // if it declares a static member (9.4) of const integral or 5351 // const enumeration type, see 9.4.2. 5352 QualType T = VDecl->getType(); 5353 5354 // Do nothing on dependent types. 5355 if (T->isDependentType()) { 5356 5357 // Require constness. 5358 } else if (!T.isConstQualified()) { 5359 Diag(VDecl->getLocation(), diag::err_in_class_initializer_non_const) 5360 << Init->getSourceRange(); 5361 VDecl->setInvalidDecl(); 5362 5363 // We allow integer constant expressions in all cases. 5364 } else if (T->isIntegralOrEnumerationType()) { 5365 if (!Init->isValueDependent()) { 5366 // Check whether the expression is a constant expression. 5367 llvm::APSInt Value; 5368 SourceLocation Loc; 5369 if (!Init->isIntegerConstantExpr(Value, Context, &Loc)) { 5370 Diag(Loc, diag::err_in_class_initializer_non_constant) 5371 << Init->getSourceRange(); 5372 VDecl->setInvalidDecl(); 5373 } 5374 } 5375 5376 // We allow floating-point constants as an extension in C++03, and 5377 // C++0x has far more complicated rules that we don't really 5378 // implement fully. 5379 } else { 5380 bool Allowed = false; 5381 if (getLangOptions().CPlusPlus0x) { 5382 Allowed = T->isLiteralType(); 5383 } else if (T->isFloatingType()) { // also permits complex, which is ok 5384 Diag(VDecl->getLocation(), diag::ext_in_class_initializer_float_type) 5385 << T << Init->getSourceRange(); 5386 Allowed = true; 5387 } 5388 5389 if (!Allowed) { 5390 Diag(VDecl->getLocation(), diag::err_in_class_initializer_bad_type) 5391 << T << Init->getSourceRange(); 5392 VDecl->setInvalidDecl(); 5393 5394 // TODO: there are probably expressions that pass here that shouldn't. 5395 } else if (!Init->isValueDependent() && 5396 !Init->isConstantInitializer(Context, false)) { 5397 Diag(Init->getExprLoc(), diag::err_in_class_initializer_non_constant) 5398 << Init->getSourceRange(); 5399 VDecl->setInvalidDecl(); 5400 } 5401 } 5402 } else if (VDecl->isFileVarDecl()) { 5403 if (VDecl->getStorageClassAsWritten() == SC_Extern && 5404 (!getLangOptions().CPlusPlus || 5405 !Context.getBaseElementType(VDecl->getType()).isConstQualified())) 5406 Diag(VDecl->getLocation(), diag::warn_extern_init); 5407 if (!VDecl->isInvalidDecl()) { 5408 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 5409 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 5410 MultiExprArg(*this, &Init, 1), 5411 &DclT); 5412 if (Result.isInvalid()) { 5413 VDecl->setInvalidDecl(); 5414 return; 5415 } 5416 5417 Init = Result.takeAs<Expr>(); 5418 } 5419 5420 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 5421 // Don't check invalid declarations to avoid emitting useless diagnostics. 5422 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 5423 // C99 6.7.8p4. All file scoped initializers need to be constant. 5424 CheckForConstantInitializer(Init, DclT); 5425 } 5426 } 5427 // If the type changed, it means we had an incomplete type that was 5428 // completed by the initializer. For example: 5429 // int ary[] = { 1, 3, 5 }; 5430 // "ary" transitions from a VariableArrayType to a ConstantArrayType. 5431 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 5432 VDecl->setType(DclT); 5433 Init->setType(DclT); 5434 } 5435 5436 5437 // If this variable is a local declaration with record type, make sure it 5438 // doesn't have a flexible member initialization. We only support this as a 5439 // global/static definition. 5440 if (VDecl->hasLocalStorage()) 5441 if (const RecordType *RT = VDecl->getType()->getAs<RecordType>()) 5442 if (RT->getDecl()->hasFlexibleArrayMember()) { 5443 // Check whether the initializer tries to initialize the flexible 5444 // array member itself to anything other than an empty initializer list. 5445 if (InitListExpr *ILE = dyn_cast<InitListExpr>(Init)) { 5446 unsigned Index = std::distance(RT->getDecl()->field_begin(), 5447 RT->getDecl()->field_end()) - 1; 5448 if (Index < ILE->getNumInits() && 5449 !(isa<InitListExpr>(ILE->getInit(Index)) && 5450 cast<InitListExpr>(ILE->getInit(Index))->getNumInits() == 0)) { 5451 Diag(VDecl->getLocation(), diag::err_nonstatic_flexible_variable); 5452 VDecl->setInvalidDecl(); 5453 } 5454 } 5455 } 5456 5457 // Check any implicit conversions within the expression. 5458 CheckImplicitConversions(Init, VDecl->getLocation()); 5459 5460 Init = MaybeCreateExprWithCleanups(Init); 5461 // Attach the initializer to the decl. 5462 VDecl->setInit(Init); 5463 5464 CheckCompleteVariableDeclaration(VDecl); 5465} 5466 5467/// ActOnInitializerError - Given that there was an error parsing an 5468/// initializer for the given declaration, try to return to some form 5469/// of sanity. 5470void Sema::ActOnInitializerError(Decl *D) { 5471 // Our main concern here is re-establishing invariants like "a 5472 // variable's type is either dependent or complete". 5473 if (!D || D->isInvalidDecl()) return; 5474 5475 VarDecl *VD = dyn_cast<VarDecl>(D); 5476 if (!VD) return; 5477 5478 // Auto types are meaningless if we can't make sense of the initializer. 5479 if (ParsingInitForAutoVars.count(D)) { 5480 D->setInvalidDecl(); 5481 return; 5482 } 5483 5484 QualType Ty = VD->getType(); 5485 if (Ty->isDependentType()) return; 5486 5487 // Require a complete type. 5488 if (RequireCompleteType(VD->getLocation(), 5489 Context.getBaseElementType(Ty), 5490 diag::err_typecheck_decl_incomplete_type)) { 5491 VD->setInvalidDecl(); 5492 return; 5493 } 5494 5495 // Require an abstract type. 5496 if (RequireNonAbstractType(VD->getLocation(), Ty, 5497 diag::err_abstract_type_in_decl, 5498 AbstractVariableType)) { 5499 VD->setInvalidDecl(); 5500 return; 5501 } 5502 5503 // Don't bother complaining about constructors or destructors, 5504 // though. 5505} 5506 5507void Sema::ActOnUninitializedDecl(Decl *RealDecl, 5508 bool TypeMayContainAuto) { 5509 // If there is no declaration, there was an error parsing it. Just ignore it. 5510 if (RealDecl == 0) 5511 return; 5512 5513 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 5514 QualType Type = Var->getType(); 5515 5516 // C++0x [dcl.spec.auto]p3 5517 if (TypeMayContainAuto && Type->getContainedAutoType()) { 5518 Diag(Var->getLocation(), diag::err_auto_var_requires_init) 5519 << Var->getDeclName() << Type; 5520 Var->setInvalidDecl(); 5521 return; 5522 } 5523 5524 switch (Var->isThisDeclarationADefinition()) { 5525 case VarDecl::Definition: 5526 if (!Var->isStaticDataMember() || !Var->getAnyInitializer()) 5527 break; 5528 5529 // We have an out-of-line definition of a static data member 5530 // that has an in-class initializer, so we type-check this like 5531 // a declaration. 5532 // 5533 // Fall through 5534 5535 case VarDecl::DeclarationOnly: 5536 // It's only a declaration. 5537 5538 // Block scope. C99 6.7p7: If an identifier for an object is 5539 // declared with no linkage (C99 6.2.2p6), the type for the 5540 // object shall be complete. 5541 if (!Type->isDependentType() && Var->isLocalVarDecl() && 5542 !Var->getLinkage() && !Var->isInvalidDecl() && 5543 RequireCompleteType(Var->getLocation(), Type, 5544 diag::err_typecheck_decl_incomplete_type)) 5545 Var->setInvalidDecl(); 5546 5547 // Make sure that the type is not abstract. 5548 if (!Type->isDependentType() && !Var->isInvalidDecl() && 5549 RequireNonAbstractType(Var->getLocation(), Type, 5550 diag::err_abstract_type_in_decl, 5551 AbstractVariableType)) 5552 Var->setInvalidDecl(); 5553 return; 5554 5555 case VarDecl::TentativeDefinition: 5556 // File scope. C99 6.9.2p2: A declaration of an identifier for an 5557 // object that has file scope without an initializer, and without a 5558 // storage-class specifier or with the storage-class specifier "static", 5559 // constitutes a tentative definition. Note: A tentative definition with 5560 // external linkage is valid (C99 6.2.2p5). 5561 if (!Var->isInvalidDecl()) { 5562 if (const IncompleteArrayType *ArrayT 5563 = Context.getAsIncompleteArrayType(Type)) { 5564 if (RequireCompleteType(Var->getLocation(), 5565 ArrayT->getElementType(), 5566 diag::err_illegal_decl_array_incomplete_type)) 5567 Var->setInvalidDecl(); 5568 } else if (Var->getStorageClass() == SC_Static) { 5569 // C99 6.9.2p3: If the declaration of an identifier for an object is 5570 // a tentative definition and has internal linkage (C99 6.2.2p3), the 5571 // declared type shall not be an incomplete type. 5572 // NOTE: code such as the following 5573 // static struct s; 5574 // struct s { int a; }; 5575 // is accepted by gcc. Hence here we issue a warning instead of 5576 // an error and we do not invalidate the static declaration. 5577 // NOTE: to avoid multiple warnings, only check the first declaration. 5578 if (Var->getPreviousDeclaration() == 0) 5579 RequireCompleteType(Var->getLocation(), Type, 5580 diag::ext_typecheck_decl_incomplete_type); 5581 } 5582 } 5583 5584 // Record the tentative definition; we're done. 5585 if (!Var->isInvalidDecl()) 5586 TentativeDefinitions.push_back(Var); 5587 return; 5588 } 5589 5590 // Provide a specific diagnostic for uninitialized variable 5591 // definitions with incomplete array type. 5592 if (Type->isIncompleteArrayType()) { 5593 Diag(Var->getLocation(), 5594 diag::err_typecheck_incomplete_array_needs_initializer); 5595 Var->setInvalidDecl(); 5596 return; 5597 } 5598 5599 // Provide a specific diagnostic for uninitialized variable 5600 // definitions with reference type. 5601 if (Type->isReferenceType()) { 5602 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 5603 << Var->getDeclName() 5604 << SourceRange(Var->getLocation(), Var->getLocation()); 5605 Var->setInvalidDecl(); 5606 return; 5607 } 5608 5609 // Do not attempt to type-check the default initializer for a 5610 // variable with dependent type. 5611 if (Type->isDependentType()) 5612 return; 5613 5614 if (Var->isInvalidDecl()) 5615 return; 5616 5617 if (RequireCompleteType(Var->getLocation(), 5618 Context.getBaseElementType(Type), 5619 diag::err_typecheck_decl_incomplete_type)) { 5620 Var->setInvalidDecl(); 5621 return; 5622 } 5623 5624 // The variable can not have an abstract class type. 5625 if (RequireNonAbstractType(Var->getLocation(), Type, 5626 diag::err_abstract_type_in_decl, 5627 AbstractVariableType)) { 5628 Var->setInvalidDecl(); 5629 return; 5630 } 5631 5632 // Check for jumps past the implicit initializer. C++0x 5633 // clarifies that this applies to a "variable with automatic 5634 // storage duration", not a "local variable". 5635 // C++0x [stmt.dcl]p3 5636 // A program that jumps from a point where a variable with automatic 5637 // storage duration is not in scope to a point where it is in scope is 5638 // ill-formed unless the variable has scalar type, class type with a 5639 // trivial default constructor and a trivial destructor, a cv-qualified 5640 // version of one of these types, or an array of one of the preceding 5641 // types and is declared without an initializer. 5642 if (getLangOptions().CPlusPlus && Var->hasLocalStorage()) { 5643 if (const RecordType *Record 5644 = Context.getBaseElementType(Type)->getAs<RecordType>()) { 5645 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record->getDecl()); 5646 if ((!getLangOptions().CPlusPlus0x && !CXXRecord->isPOD()) || 5647 (getLangOptions().CPlusPlus0x && 5648 (!CXXRecord->hasTrivialDefaultConstructor() || 5649 !CXXRecord->hasTrivialDestructor()))) 5650 getCurFunction()->setHasBranchProtectedScope(); 5651 } 5652 } 5653 5654 // C++03 [dcl.init]p9: 5655 // If no initializer is specified for an object, and the 5656 // object is of (possibly cv-qualified) non-POD class type (or 5657 // array thereof), the object shall be default-initialized; if 5658 // the object is of const-qualified type, the underlying class 5659 // type shall have a user-declared default 5660 // constructor. Otherwise, if no initializer is specified for 5661 // a non- static object, the object and its subobjects, if 5662 // any, have an indeterminate initial value); if the object 5663 // or any of its subobjects are of const-qualified type, the 5664 // program is ill-formed. 5665 // C++0x [dcl.init]p11: 5666 // If no initializer is specified for an object, the object is 5667 // default-initialized; [...]. 5668 InitializedEntity Entity = InitializedEntity::InitializeVariable(Var); 5669 InitializationKind Kind 5670 = InitializationKind::CreateDefault(Var->getLocation()); 5671 5672 InitializationSequence InitSeq(*this, Entity, Kind, 0, 0); 5673 ExprResult Init = InitSeq.Perform(*this, Entity, Kind, 5674 MultiExprArg(*this, 0, 0)); 5675 if (Init.isInvalid()) 5676 Var->setInvalidDecl(); 5677 else if (Init.get()) 5678 Var->setInit(MaybeCreateExprWithCleanups(Init.get())); 5679 5680 CheckCompleteVariableDeclaration(Var); 5681 } 5682} 5683 5684void Sema::ActOnCXXForRangeDecl(Decl *D) { 5685 VarDecl *VD = dyn_cast<VarDecl>(D); 5686 if (!VD) { 5687 Diag(D->getLocation(), diag::err_for_range_decl_must_be_var); 5688 D->setInvalidDecl(); 5689 return; 5690 } 5691 5692 VD->setCXXForRangeDecl(true); 5693 5694 // for-range-declaration cannot be given a storage class specifier. 5695 int Error = -1; 5696 switch (VD->getStorageClassAsWritten()) { 5697 case SC_None: 5698 break; 5699 case SC_Extern: 5700 Error = 0; 5701 break; 5702 case SC_Static: 5703 Error = 1; 5704 break; 5705 case SC_PrivateExtern: 5706 Error = 2; 5707 break; 5708 case SC_Auto: 5709 Error = 3; 5710 break; 5711 case SC_Register: 5712 Error = 4; 5713 break; 5714 } 5715 // FIXME: constexpr isn't allowed here. 5716 //if (DS.isConstexprSpecified()) 5717 // Error = 5; 5718 if (Error != -1) { 5719 Diag(VD->getOuterLocStart(), diag::err_for_range_storage_class) 5720 << VD->getDeclName() << Error; 5721 D->setInvalidDecl(); 5722 } 5723} 5724 5725void Sema::CheckCompleteVariableDeclaration(VarDecl *var) { 5726 if (var->isInvalidDecl()) return; 5727 5728 // All the following checks are C++ only. 5729 if (!getLangOptions().CPlusPlus) return; 5730 5731 QualType baseType = Context.getBaseElementType(var->getType()); 5732 if (baseType->isDependentType()) return; 5733 5734 // __block variables might require us to capture a copy-initializer. 5735 if (var->hasAttr<BlocksAttr>()) { 5736 // It's currently invalid to ever have a __block variable with an 5737 // array type; should we diagnose that here? 5738 5739 // Regardless, we don't want to ignore array nesting when 5740 // constructing this copy. 5741 QualType type = var->getType(); 5742 5743 if (type->isStructureOrClassType()) { 5744 SourceLocation poi = var->getLocation(); 5745 Expr *varRef = new (Context) DeclRefExpr(var, type, VK_LValue, poi); 5746 ExprResult result = 5747 PerformCopyInitialization( 5748 InitializedEntity::InitializeBlock(poi, type, false), 5749 poi, Owned(varRef)); 5750 if (!result.isInvalid()) { 5751 result = MaybeCreateExprWithCleanups(result); 5752 Expr *init = result.takeAs<Expr>(); 5753 Context.setBlockVarCopyInits(var, init); 5754 } 5755 } 5756 } 5757 5758 // Check for global constructors. 5759 if (!var->getDeclContext()->isDependentContext() && 5760 var->hasGlobalStorage() && 5761 !var->isStaticLocal() && 5762 var->getInit() && 5763 !var->getInit()->isConstantInitializer(Context, 5764 baseType->isReferenceType())) 5765 Diag(var->getLocation(), diag::warn_global_constructor) 5766 << var->getInit()->getSourceRange(); 5767 5768 // Require the destructor. 5769 if (const RecordType *recordType = baseType->getAs<RecordType>()) 5770 FinalizeVarWithDestructor(var, recordType); 5771} 5772 5773/// FinalizeDeclaration - called by ParseDeclarationAfterDeclarator to perform 5774/// any semantic actions necessary after any initializer has been attached. 5775void 5776Sema::FinalizeDeclaration(Decl *ThisDecl) { 5777 // Note that we are no longer parsing the initializer for this declaration. 5778 ParsingInitForAutoVars.erase(ThisDecl); 5779} 5780 5781Sema::DeclGroupPtrTy 5782Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, 5783 Decl **Group, unsigned NumDecls) { 5784 llvm::SmallVector<Decl*, 8> Decls; 5785 5786 if (DS.isTypeSpecOwned()) 5787 Decls.push_back(DS.getRepAsDecl()); 5788 5789 for (unsigned i = 0; i != NumDecls; ++i) 5790 if (Decl *D = Group[i]) 5791 Decls.push_back(D); 5792 5793 return BuildDeclaratorGroup(Decls.data(), Decls.size(), 5794 DS.getTypeSpecType() == DeclSpec::TST_auto); 5795} 5796 5797/// BuildDeclaratorGroup - convert a list of declarations into a declaration 5798/// group, performing any necessary semantic checking. 5799Sema::DeclGroupPtrTy 5800Sema::BuildDeclaratorGroup(Decl **Group, unsigned NumDecls, 5801 bool TypeMayContainAuto) { 5802 // C++0x [dcl.spec.auto]p7: 5803 // If the type deduced for the template parameter U is not the same in each 5804 // deduction, the program is ill-formed. 5805 // FIXME: When initializer-list support is added, a distinction is needed 5806 // between the deduced type U and the deduced type which 'auto' stands for. 5807 // auto a = 0, b = { 1, 2, 3 }; 5808 // is legal because the deduced type U is 'int' in both cases. 5809 if (TypeMayContainAuto && NumDecls > 1) { 5810 QualType Deduced; 5811 CanQualType DeducedCanon; 5812 VarDecl *DeducedDecl = 0; 5813 for (unsigned i = 0; i != NumDecls; ++i) { 5814 if (VarDecl *D = dyn_cast<VarDecl>(Group[i])) { 5815 AutoType *AT = D->getType()->getContainedAutoType(); 5816 // Don't reissue diagnostics when instantiating a template. 5817 if (AT && D->isInvalidDecl()) 5818 break; 5819 if (AT && AT->isDeduced()) { 5820 QualType U = AT->getDeducedType(); 5821 CanQualType UCanon = Context.getCanonicalType(U); 5822 if (Deduced.isNull()) { 5823 Deduced = U; 5824 DeducedCanon = UCanon; 5825 DeducedDecl = D; 5826 } else if (DeducedCanon != UCanon) { 5827 Diag(D->getTypeSourceInfo()->getTypeLoc().getBeginLoc(), 5828 diag::err_auto_different_deductions) 5829 << Deduced << DeducedDecl->getDeclName() 5830 << U << D->getDeclName() 5831 << DeducedDecl->getInit()->getSourceRange() 5832 << D->getInit()->getSourceRange(); 5833 D->setInvalidDecl(); 5834 break; 5835 } 5836 } 5837 } 5838 } 5839 } 5840 5841 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, NumDecls)); 5842} 5843 5844 5845/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 5846/// to introduce parameters into function prototype scope. 5847Decl *Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 5848 const DeclSpec &DS = D.getDeclSpec(); 5849 5850 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 5851 VarDecl::StorageClass StorageClass = SC_None; 5852 VarDecl::StorageClass StorageClassAsWritten = SC_None; 5853 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 5854 StorageClass = SC_Register; 5855 StorageClassAsWritten = SC_Register; 5856 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 5857 Diag(DS.getStorageClassSpecLoc(), 5858 diag::err_invalid_storage_class_in_func_decl); 5859 D.getMutableDeclSpec().ClearStorageClassSpecs(); 5860 } 5861 5862 if (D.getDeclSpec().isThreadSpecified()) 5863 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 5864 5865 DiagnoseFunctionSpecifiers(D); 5866 5867 TagDecl *OwnedDecl = 0; 5868 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S, &OwnedDecl); 5869 QualType parmDeclType = TInfo->getType(); 5870 5871 if (getLangOptions().CPlusPlus) { 5872 // Check that there are no default arguments inside the type of this 5873 // parameter. 5874 CheckExtraCXXDefaultArguments(D); 5875 5876 if (OwnedDecl && OwnedDecl->isDefinition()) { 5877 // C++ [dcl.fct]p6: 5878 // Types shall not be defined in return or parameter types. 5879 Diag(OwnedDecl->getLocation(), diag::err_type_defined_in_param_type) 5880 << Context.getTypeDeclType(OwnedDecl); 5881 } 5882 5883 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 5884 if (D.getCXXScopeSpec().isSet()) { 5885 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 5886 << D.getCXXScopeSpec().getRange(); 5887 D.getCXXScopeSpec().clear(); 5888 } 5889 } 5890 5891 // Ensure we have a valid name 5892 IdentifierInfo *II = 0; 5893 if (D.hasName()) { 5894 II = D.getIdentifier(); 5895 if (!II) { 5896 Diag(D.getIdentifierLoc(), diag::err_bad_parameter_name) 5897 << GetNameForDeclarator(D).getName().getAsString(); 5898 D.setInvalidType(true); 5899 } 5900 } 5901 5902 // Check for redeclaration of parameters, e.g. int foo(int x, int x); 5903 if (II) { 5904 LookupResult R(*this, II, D.getIdentifierLoc(), LookupOrdinaryName, 5905 ForRedeclaration); 5906 LookupName(R, S); 5907 if (R.isSingleResult()) { 5908 NamedDecl *PrevDecl = R.getFoundDecl(); 5909 if (PrevDecl->isTemplateParameter()) { 5910 // Maybe we will complain about the shadowed template parameter. 5911 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 5912 // Just pretend that we didn't see the previous declaration. 5913 PrevDecl = 0; 5914 } else if (S->isDeclScope(PrevDecl)) { 5915 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 5916 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 5917 5918 // Recover by removing the name 5919 II = 0; 5920 D.SetIdentifier(0, D.getIdentifierLoc()); 5921 D.setInvalidType(true); 5922 } 5923 } 5924 } 5925 5926 // Temporarily put parameter variables in the translation unit, not 5927 // the enclosing context. This prevents them from accidentally 5928 // looking like class members in C++. 5929 ParmVarDecl *New = CheckParameter(Context.getTranslationUnitDecl(), 5930 D.getSourceRange().getBegin(), 5931 D.getIdentifierLoc(), II, 5932 parmDeclType, TInfo, 5933 StorageClass, StorageClassAsWritten); 5934 5935 if (D.isInvalidType()) 5936 New->setInvalidDecl(); 5937 5938 assert(S->isFunctionPrototypeScope()); 5939 assert(S->getFunctionPrototypeDepth() >= 1); 5940 New->setScopeInfo(S->getFunctionPrototypeDepth() - 1, 5941 S->getNextFunctionPrototypeIndex()); 5942 5943 // Add the parameter declaration into this scope. 5944 S->AddDecl(New); 5945 if (II) 5946 IdResolver.AddDecl(New); 5947 5948 ProcessDeclAttributes(S, New, D); 5949 5950 if (New->hasAttr<BlocksAttr>()) { 5951 Diag(New->getLocation(), diag::err_block_on_nonlocal); 5952 } 5953 return New; 5954} 5955 5956/// \brief Synthesizes a variable for a parameter arising from a 5957/// typedef. 5958ParmVarDecl *Sema::BuildParmVarDeclForTypedef(DeclContext *DC, 5959 SourceLocation Loc, 5960 QualType T) { 5961 /* FIXME: setting StartLoc == Loc. 5962 Would it be worth to modify callers so as to provide proper source 5963 location for the unnamed parameters, embedding the parameter's type? */ 5964 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, Loc, Loc, 0, 5965 T, Context.getTrivialTypeSourceInfo(T, Loc), 5966 SC_None, SC_None, 0); 5967 Param->setImplicit(); 5968 return Param; 5969} 5970 5971void Sema::DiagnoseUnusedParameters(ParmVarDecl * const *Param, 5972 ParmVarDecl * const *ParamEnd) { 5973 // Don't diagnose unused-parameter errors in template instantiations; we 5974 // will already have done so in the template itself. 5975 if (!ActiveTemplateInstantiations.empty()) 5976 return; 5977 5978 for (; Param != ParamEnd; ++Param) { 5979 if (!(*Param)->isUsed() && (*Param)->getDeclName() && 5980 !(*Param)->hasAttr<UnusedAttr>()) { 5981 Diag((*Param)->getLocation(), diag::warn_unused_parameter) 5982 << (*Param)->getDeclName(); 5983 } 5984 } 5985} 5986 5987void Sema::DiagnoseSizeOfParametersAndReturnValue(ParmVarDecl * const *Param, 5988 ParmVarDecl * const *ParamEnd, 5989 QualType ReturnTy, 5990 NamedDecl *D) { 5991 if (LangOpts.NumLargeByValueCopy == 0) // No check. 5992 return; 5993 5994 // Warn if the return value is pass-by-value and larger than the specified 5995 // threshold. 5996 if (ReturnTy->isPODType()) { 5997 unsigned Size = Context.getTypeSizeInChars(ReturnTy).getQuantity(); 5998 if (Size > LangOpts.NumLargeByValueCopy) 5999 Diag(D->getLocation(), diag::warn_return_value_size) 6000 << D->getDeclName() << Size; 6001 } 6002 6003 // Warn if any parameter is pass-by-value and larger than the specified 6004 // threshold. 6005 for (; Param != ParamEnd; ++Param) { 6006 QualType T = (*Param)->getType(); 6007 if (!T->isPODType()) 6008 continue; 6009 unsigned Size = Context.getTypeSizeInChars(T).getQuantity(); 6010 if (Size > LangOpts.NumLargeByValueCopy) 6011 Diag((*Param)->getLocation(), diag::warn_parameter_size) 6012 << (*Param)->getDeclName() << Size; 6013 } 6014} 6015 6016ParmVarDecl *Sema::CheckParameter(DeclContext *DC, SourceLocation StartLoc, 6017 SourceLocation NameLoc, IdentifierInfo *Name, 6018 QualType T, TypeSourceInfo *TSInfo, 6019 VarDecl::StorageClass StorageClass, 6020 VarDecl::StorageClass StorageClassAsWritten) { 6021 ParmVarDecl *New = ParmVarDecl::Create(Context, DC, StartLoc, NameLoc, Name, 6022 adjustParameterType(T), TSInfo, 6023 StorageClass, StorageClassAsWritten, 6024 0); 6025 6026 // Parameters can not be abstract class types. 6027 // For record types, this is done by the AbstractClassUsageDiagnoser once 6028 // the class has been completely parsed. 6029 if (!CurContext->isRecord() && 6030 RequireNonAbstractType(NameLoc, T, diag::err_abstract_type_in_decl, 6031 AbstractParamType)) 6032 New->setInvalidDecl(); 6033 6034 // Parameter declarators cannot be interface types. All ObjC objects are 6035 // passed by reference. 6036 if (T->isObjCObjectType()) { 6037 Diag(NameLoc, 6038 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T; 6039 New->setInvalidDecl(); 6040 } 6041 6042 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage 6043 // duration shall not be qualified by an address-space qualifier." 6044 // Since all parameters have automatic store duration, they can not have 6045 // an address space. 6046 if (T.getAddressSpace() != 0) { 6047 Diag(NameLoc, diag::err_arg_with_address_space); 6048 New->setInvalidDecl(); 6049 } 6050 6051 return New; 6052} 6053 6054void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 6055 SourceLocation LocAfterDecls) { 6056 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 6057 6058 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 6059 // for a K&R function. 6060 if (!FTI.hasPrototype) { 6061 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 6062 --i; 6063 if (FTI.ArgInfo[i].Param == 0) { 6064 llvm::SmallString<256> Code; 6065 llvm::raw_svector_ostream(Code) << " int " 6066 << FTI.ArgInfo[i].Ident->getName() 6067 << ";\n"; 6068 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 6069 << FTI.ArgInfo[i].Ident 6070 << FixItHint::CreateInsertion(LocAfterDecls, Code.str()); 6071 6072 // Implicitly declare the argument as type 'int' for lack of a better 6073 // type. 6074 AttributeFactory attrs; 6075 DeclSpec DS(attrs); 6076 const char* PrevSpec; // unused 6077 unsigned DiagID; // unused 6078 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 6079 PrevSpec, DiagID); 6080 Declarator ParamD(DS, Declarator::KNRTypeListContext); 6081 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 6082 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 6083 } 6084 } 6085 } 6086} 6087 6088Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, 6089 Declarator &D) { 6090 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 6091 assert(D.isFunctionDeclarator() && "Not a function declarator!"); 6092 Scope *ParentScope = FnBodyScope->getParent(); 6093 6094 Decl *DP = HandleDeclarator(ParentScope, D, 6095 MultiTemplateParamsArg(*this), 6096 /*IsFunctionDefinition=*/true); 6097 return ActOnStartOfFunctionDef(FnBodyScope, DP); 6098} 6099 6100static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD) { 6101 // Don't warn about invalid declarations. 6102 if (FD->isInvalidDecl()) 6103 return false; 6104 6105 // Or declarations that aren't global. 6106 if (!FD->isGlobal()) 6107 return false; 6108 6109 // Don't warn about C++ member functions. 6110 if (isa<CXXMethodDecl>(FD)) 6111 return false; 6112 6113 // Don't warn about 'main'. 6114 if (FD->isMain()) 6115 return false; 6116 6117 // Don't warn about inline functions. 6118 if (FD->isInlined()) 6119 return false; 6120 6121 // Don't warn about function templates. 6122 if (FD->getDescribedFunctionTemplate()) 6123 return false; 6124 6125 // Don't warn about function template specializations. 6126 if (FD->isFunctionTemplateSpecialization()) 6127 return false; 6128 6129 bool MissingPrototype = true; 6130 for (const FunctionDecl *Prev = FD->getPreviousDeclaration(); 6131 Prev; Prev = Prev->getPreviousDeclaration()) { 6132 // Ignore any declarations that occur in function or method 6133 // scope, because they aren't visible from the header. 6134 if (Prev->getDeclContext()->isFunctionOrMethod()) 6135 continue; 6136 6137 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 6138 break; 6139 } 6140 6141 return MissingPrototype; 6142} 6143 6144void Sema::CheckForFunctionRedefinition(FunctionDecl *FD) { 6145 // Don't complain if we're in GNU89 mode and the previous definition 6146 // was an extern inline function. 6147 const FunctionDecl *Definition; 6148 if (FD->isDefined(Definition) && 6149 !canRedefineFunction(Definition, getLangOptions())) { 6150 if (getLangOptions().GNUMode && Definition->isInlineSpecified() && 6151 Definition->getStorageClass() == SC_Extern) 6152 Diag(FD->getLocation(), diag::err_redefinition_extern_inline) 6153 << FD->getDeclName() << getLangOptions().CPlusPlus; 6154 else 6155 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 6156 Diag(Definition->getLocation(), diag::note_previous_definition); 6157 } 6158} 6159 6160Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Decl *D) { 6161 // Clear the last template instantiation error context. 6162 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation(); 6163 6164 if (!D) 6165 return D; 6166 FunctionDecl *FD = 0; 6167 6168 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(D)) 6169 FD = FunTmpl->getTemplatedDecl(); 6170 else 6171 FD = cast<FunctionDecl>(D); 6172 6173 // Enter a new function scope 6174 PushFunctionScope(); 6175 6176 // See if this is a redefinition. 6177 if (!FD->isLateTemplateParsed()) 6178 CheckForFunctionRedefinition(FD); 6179 6180 // Builtin functions cannot be defined. 6181 if (unsigned BuiltinID = FD->getBuiltinID()) { 6182 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 6183 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 6184 FD->setInvalidDecl(); 6185 } 6186 } 6187 6188 // The return type of a function definition must be complete 6189 // (C99 6.9.1p3, C++ [dcl.fct]p6). 6190 QualType ResultType = FD->getResultType(); 6191 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 6192 !FD->isInvalidDecl() && 6193 RequireCompleteType(FD->getLocation(), ResultType, 6194 diag::err_func_def_incomplete_result)) 6195 FD->setInvalidDecl(); 6196 6197 // GNU warning -Wmissing-prototypes: 6198 // Warn if a global function is defined without a previous 6199 // prototype declaration. This warning is issued even if the 6200 // definition itself provides a prototype. The aim is to detect 6201 // global functions that fail to be declared in header files. 6202 if (ShouldWarnAboutMissingPrototype(FD)) 6203 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 6204 6205 if (FnBodyScope) 6206 PushDeclContext(FnBodyScope, FD); 6207 6208 // Check the validity of our function parameters 6209 CheckParmsForFunctionDef(FD->param_begin(), FD->param_end(), 6210 /*CheckParameterNames=*/true); 6211 6212 // Introduce our parameters into the function scope 6213 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 6214 ParmVarDecl *Param = FD->getParamDecl(p); 6215 Param->setOwningFunction(FD); 6216 6217 // If this has an identifier, add it to the scope stack. 6218 if (Param->getIdentifier() && FnBodyScope) { 6219 CheckShadow(FnBodyScope, Param); 6220 6221 PushOnScopeChains(Param, FnBodyScope); 6222 } 6223 } 6224 6225 // Checking attributes of current function definition 6226 // dllimport attribute. 6227 DLLImportAttr *DA = FD->getAttr<DLLImportAttr>(); 6228 if (DA && (!FD->getAttr<DLLExportAttr>())) { 6229 // dllimport attribute cannot be directly applied to definition. 6230 // Microsoft accepts dllimport for functions defined within class scope. 6231 if (!DA->isInherited() && 6232 !(LangOpts.Microsoft && FD->getLexicalDeclContext()->isRecord())) { 6233 Diag(FD->getLocation(), 6234 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 6235 << "dllimport"; 6236 FD->setInvalidDecl(); 6237 return FD; 6238 } 6239 6240 // Visual C++ appears to not think this is an issue, so only issue 6241 // a warning when Microsoft extensions are disabled. 6242 if (!LangOpts.Microsoft) { 6243 // If a symbol previously declared dllimport is later defined, the 6244 // attribute is ignored in subsequent references, and a warning is 6245 // emitted. 6246 Diag(FD->getLocation(), 6247 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 6248 << FD->getName() << "dllimport"; 6249 } 6250 } 6251 return FD; 6252} 6253 6254/// \brief Given the set of return statements within a function body, 6255/// compute the variables that are subject to the named return value 6256/// optimization. 6257/// 6258/// Each of the variables that is subject to the named return value 6259/// optimization will be marked as NRVO variables in the AST, and any 6260/// return statement that has a marked NRVO variable as its NRVO candidate can 6261/// use the named return value optimization. 6262/// 6263/// This function applies a very simplistic algorithm for NRVO: if every return 6264/// statement in the function has the same NRVO candidate, that candidate is 6265/// the NRVO variable. 6266/// 6267/// FIXME: Employ a smarter algorithm that accounts for multiple return 6268/// statements and the lifetimes of the NRVO candidates. We should be able to 6269/// find a maximal set of NRVO variables. 6270static void ComputeNRVO(Stmt *Body, FunctionScopeInfo *Scope) { 6271 ReturnStmt **Returns = Scope->Returns.data(); 6272 6273 const VarDecl *NRVOCandidate = 0; 6274 for (unsigned I = 0, E = Scope->Returns.size(); I != E; ++I) { 6275 if (!Returns[I]->getNRVOCandidate()) 6276 return; 6277 6278 if (!NRVOCandidate) 6279 NRVOCandidate = Returns[I]->getNRVOCandidate(); 6280 else if (NRVOCandidate != Returns[I]->getNRVOCandidate()) 6281 return; 6282 } 6283 6284 if (NRVOCandidate) 6285 const_cast<VarDecl*>(NRVOCandidate)->setNRVOVariable(true); 6286} 6287 6288Decl *Sema::ActOnFinishFunctionBody(Decl *D, Stmt *BodyArg) { 6289 return ActOnFinishFunctionBody(D, move(BodyArg), false); 6290} 6291 6292Decl *Sema::ActOnFinishFunctionBody(Decl *dcl, Stmt *Body, 6293 bool IsInstantiation) { 6294 FunctionDecl *FD = 0; 6295 FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl); 6296 if (FunTmpl) 6297 FD = FunTmpl->getTemplatedDecl(); 6298 else 6299 FD = dyn_cast_or_null<FunctionDecl>(dcl); 6300 6301 sema::AnalysisBasedWarnings::Policy WP = AnalysisWarnings.getDefaultPolicy(); 6302 sema::AnalysisBasedWarnings::Policy *ActivePolicy = 0; 6303 6304 if (FD) { 6305 FD->setBody(Body); 6306 if (FD->isMain()) { 6307 // C and C++ allow for main to automagically return 0. 6308 // Implements C++ [basic.start.main]p5 and C99 5.1.2.2.3. 6309 FD->setHasImplicitReturnZero(true); 6310 WP.disableCheckFallThrough(); 6311 } 6312 6313 // MSVC permits the use of pure specifier (=0) on function definition, 6314 // defined at class scope, warn about this non standard construct. 6315 if (getLangOptions().Microsoft && FD->isPure()) 6316 Diag(FD->getLocation(), diag::warn_pure_function_definition); 6317 6318 if (!FD->isInvalidDecl()) { 6319 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end()); 6320 DiagnoseSizeOfParametersAndReturnValue(FD->param_begin(), FD->param_end(), 6321 FD->getResultType(), FD); 6322 6323 // If this is a constructor, we need a vtable. 6324 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(FD)) 6325 MarkVTableUsed(FD->getLocation(), Constructor->getParent()); 6326 6327 ComputeNRVO(Body, getCurFunction()); 6328 } 6329 6330 assert(FD == getCurFunctionDecl() && "Function parsing confused"); 6331 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 6332 assert(MD == getCurMethodDecl() && "Method parsing confused"); 6333 MD->setBody(Body); 6334 if (Body) 6335 MD->setEndLoc(Body->getLocEnd()); 6336 if (!MD->isInvalidDecl()) { 6337 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end()); 6338 DiagnoseSizeOfParametersAndReturnValue(MD->param_begin(), MD->param_end(), 6339 MD->getResultType(), MD); 6340 } 6341 } else { 6342 return 0; 6343 } 6344 6345 // Verify and clean out per-function state. 6346 if (Body) { 6347 // C++ constructors that have function-try-blocks can't have return 6348 // statements in the handlers of that block. (C++ [except.handle]p14) 6349 // Verify this. 6350 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body)) 6351 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); 6352 6353 // Verify that that gotos and switch cases don't jump into scopes illegally. 6354 // Verify that that gotos and switch cases don't jump into scopes illegally. 6355 if (getCurFunction()->NeedsScopeChecking() && 6356 !dcl->isInvalidDecl() && 6357 !hasAnyErrorsInThisFunction()) 6358 DiagnoseInvalidJumps(Body); 6359 6360 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) { 6361 if (!Destructor->getParent()->isDependentType()) 6362 CheckDestructor(Destructor); 6363 6364 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 6365 Destructor->getParent()); 6366 } 6367 6368 // If any errors have occurred, clear out any temporaries that may have 6369 // been leftover. This ensures that these temporaries won't be picked up for 6370 // deletion in some later function. 6371 if (PP.getDiagnostics().hasErrorOccurred() || 6372 PP.getDiagnostics().getSuppressAllDiagnostics()) 6373 ExprTemporaries.clear(); 6374 else if (!isa<FunctionTemplateDecl>(dcl)) { 6375 // Since the body is valid, issue any analysis-based warnings that are 6376 // enabled. 6377 ActivePolicy = &WP; 6378 } 6379 6380 assert(ExprTemporaries.empty() && "Leftover temporaries in function"); 6381 } 6382 6383 if (!IsInstantiation) 6384 PopDeclContext(); 6385 6386 PopFunctionOrBlockScope(ActivePolicy, dcl); 6387 6388 // If any errors have occurred, clear out any temporaries that may have 6389 // been leftover. This ensures that these temporaries won't be picked up for 6390 // deletion in some later function. 6391 if (getDiagnostics().hasErrorOccurred()) 6392 ExprTemporaries.clear(); 6393 6394 return dcl; 6395} 6396 6397/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 6398/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 6399NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 6400 IdentifierInfo &II, Scope *S) { 6401 // Before we produce a declaration for an implicitly defined 6402 // function, see whether there was a locally-scoped declaration of 6403 // this name as a function or variable. If so, use that 6404 // (non-visible) declaration, and complain about it. 6405 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 6406 = LocallyScopedExternalDecls.find(&II); 6407 if (Pos != LocallyScopedExternalDecls.end()) { 6408 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 6409 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 6410 return Pos->second; 6411 } 6412 6413 // Extension in C99. Legal in C90, but warn about it. 6414 if (II.getName().startswith("__builtin_")) 6415 Diag(Loc, diag::warn_builtin_unknown) << &II; 6416 else if (getLangOptions().C99) 6417 Diag(Loc, diag::ext_implicit_function_decl) << &II; 6418 else 6419 Diag(Loc, diag::warn_implicit_function_decl) << &II; 6420 6421 // Set a Declarator for the implicit definition: int foo(); 6422 const char *Dummy; 6423 AttributeFactory attrFactory; 6424 DeclSpec DS(attrFactory); 6425 unsigned DiagID; 6426 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID); 6427 (void)Error; // Silence warning. 6428 assert(!Error && "Error setting up implicit decl!"); 6429 Declarator D(DS, Declarator::BlockContext); 6430 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0, 6431 0, 0, true, SourceLocation(), 6432 EST_None, SourceLocation(), 6433 0, 0, 0, 0, Loc, Loc, D), 6434 DS.getAttributes(), 6435 SourceLocation()); 6436 D.SetIdentifier(&II, Loc); 6437 6438 // Insert this function into translation-unit scope. 6439 6440 DeclContext *PrevDC = CurContext; 6441 CurContext = Context.getTranslationUnitDecl(); 6442 6443 FunctionDecl *FD = dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D)); 6444 FD->setImplicit(); 6445 6446 CurContext = PrevDC; 6447 6448 AddKnownFunctionAttributes(FD); 6449 6450 return FD; 6451} 6452 6453/// \brief Adds any function attributes that we know a priori based on 6454/// the declaration of this function. 6455/// 6456/// These attributes can apply both to implicitly-declared builtins 6457/// (like __builtin___printf_chk) or to library-declared functions 6458/// like NSLog or printf. 6459void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 6460 if (FD->isInvalidDecl()) 6461 return; 6462 6463 // If this is a built-in function, map its builtin attributes to 6464 // actual attributes. 6465 if (unsigned BuiltinID = FD->getBuiltinID()) { 6466 // Handle printf-formatting attributes. 6467 unsigned FormatIdx; 6468 bool HasVAListArg; 6469 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 6470 if (!FD->getAttr<FormatAttr>()) 6471 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 6472 "printf", FormatIdx+1, 6473 HasVAListArg ? 0 : FormatIdx+2)); 6474 } 6475 if (Context.BuiltinInfo.isScanfLike(BuiltinID, FormatIdx, 6476 HasVAListArg)) { 6477 if (!FD->getAttr<FormatAttr>()) 6478 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 6479 "scanf", FormatIdx+1, 6480 HasVAListArg ? 0 : FormatIdx+2)); 6481 } 6482 6483 // Mark const if we don't care about errno and that is the only 6484 // thing preventing the function from being const. This allows 6485 // IRgen to use LLVM intrinsics for such functions. 6486 if (!getLangOptions().MathErrno && 6487 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 6488 if (!FD->getAttr<ConstAttr>()) 6489 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 6490 } 6491 6492 if (Context.BuiltinInfo.isNoThrow(BuiltinID)) 6493 FD->addAttr(::new (Context) NoThrowAttr(FD->getLocation(), Context)); 6494 if (Context.BuiltinInfo.isConst(BuiltinID)) 6495 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 6496 } 6497 6498 IdentifierInfo *Name = FD->getIdentifier(); 6499 if (!Name) 6500 return; 6501 if ((!getLangOptions().CPlusPlus && 6502 FD->getDeclContext()->isTranslationUnit()) || 6503 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 6504 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 6505 LinkageSpecDecl::lang_c)) { 6506 // Okay: this could be a libc/libm/Objective-C function we know 6507 // about. 6508 } else 6509 return; 6510 6511 if (Name->isStr("NSLog") || Name->isStr("NSLogv")) { 6512 // FIXME: NSLog and NSLogv should be target specific 6513 if (const FormatAttr *Format = FD->getAttr<FormatAttr>()) { 6514 // FIXME: We known better than our headers. 6515 const_cast<FormatAttr *>(Format)->setType(Context, "printf"); 6516 } else 6517 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 6518 "printf", 1, 6519 Name->isStr("NSLogv") ? 0 : 2)); 6520 } else if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { 6521 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be 6522 // target-specific builtins, perhaps? 6523 if (!FD->getAttr<FormatAttr>()) 6524 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 6525 "printf", 2, 6526 Name->isStr("vasprintf") ? 0 : 3)); 6527 } 6528} 6529 6530TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 6531 TypeSourceInfo *TInfo) { 6532 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 6533 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 6534 6535 if (!TInfo) { 6536 assert(D.isInvalidType() && "no declarator info for valid type"); 6537 TInfo = Context.getTrivialTypeSourceInfo(T); 6538 } 6539 6540 // Scope manipulation handled by caller. 6541 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 6542 D.getSourceRange().getBegin(), 6543 D.getIdentifierLoc(), 6544 D.getIdentifier(), 6545 TInfo); 6546 6547 // Bail out immediately if we have an invalid declaration. 6548 if (D.isInvalidType()) { 6549 NewTD->setInvalidDecl(); 6550 return NewTD; 6551 } 6552 6553 // C++ [dcl.typedef]p8: 6554 // If the typedef declaration defines an unnamed class (or 6555 // enum), the first typedef-name declared by the declaration 6556 // to be that class type (or enum type) is used to denote the 6557 // class type (or enum type) for linkage purposes only. 6558 // We need to check whether the type was declared in the declaration. 6559 switch (D.getDeclSpec().getTypeSpecType()) { 6560 case TST_enum: 6561 case TST_struct: 6562 case TST_union: 6563 case TST_class: { 6564 TagDecl *tagFromDeclSpec = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 6565 6566 // Do nothing if the tag is not anonymous or already has an 6567 // associated typedef (from an earlier typedef in this decl group). 6568 if (tagFromDeclSpec->getIdentifier()) break; 6569 if (tagFromDeclSpec->getTypedefNameForAnonDecl()) break; 6570 6571 // A well-formed anonymous tag must always be a TUK_Definition. 6572 assert(tagFromDeclSpec->isThisDeclarationADefinition()); 6573 6574 // The type must match the tag exactly; no qualifiers allowed. 6575 if (!Context.hasSameType(T, Context.getTagDeclType(tagFromDeclSpec))) 6576 break; 6577 6578 // Otherwise, set this is the anon-decl typedef for the tag. 6579 tagFromDeclSpec->setTypedefNameForAnonDecl(NewTD); 6580 break; 6581 } 6582 6583 default: 6584 break; 6585 } 6586 6587 return NewTD; 6588} 6589 6590 6591/// \brief Determine whether a tag with a given kind is acceptable 6592/// as a redeclaration of the given tag declaration. 6593/// 6594/// \returns true if the new tag kind is acceptable, false otherwise. 6595bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, 6596 TagTypeKind NewTag, 6597 SourceLocation NewTagLoc, 6598 const IdentifierInfo &Name) { 6599 // C++ [dcl.type.elab]p3: 6600 // The class-key or enum keyword present in the 6601 // elaborated-type-specifier shall agree in kind with the 6602 // declaration to which the name in the elaborated-type-specifier 6603 // refers. This rule also applies to the form of 6604 // elaborated-type-specifier that declares a class-name or 6605 // friend class since it can be construed as referring to the 6606 // definition of the class. Thus, in any 6607 // elaborated-type-specifier, the enum keyword shall be used to 6608 // refer to an enumeration (7.2), the union class-key shall be 6609 // used to refer to a union (clause 9), and either the class or 6610 // struct class-key shall be used to refer to a class (clause 9) 6611 // declared using the class or struct class-key. 6612 TagTypeKind OldTag = Previous->getTagKind(); 6613 if (OldTag == NewTag) 6614 return true; 6615 6616 if ((OldTag == TTK_Struct || OldTag == TTK_Class) && 6617 (NewTag == TTK_Struct || NewTag == TTK_Class)) { 6618 // Warn about the struct/class tag mismatch. 6619 bool isTemplate = false; 6620 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) 6621 isTemplate = Record->getDescribedClassTemplate(); 6622 6623 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 6624 << (NewTag == TTK_Class) 6625 << isTemplate << &Name 6626 << FixItHint::CreateReplacement(SourceRange(NewTagLoc), 6627 OldTag == TTK_Class? "class" : "struct"); 6628 Diag(Previous->getLocation(), diag::note_previous_use); 6629 return true; 6630 } 6631 return false; 6632} 6633 6634/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 6635/// former case, Name will be non-null. In the later case, Name will be null. 6636/// TagSpec indicates what kind of tag this is. TUK indicates whether this is a 6637/// reference/declaration/definition of a tag. 6638Decl *Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK, 6639 SourceLocation KWLoc, CXXScopeSpec &SS, 6640 IdentifierInfo *Name, SourceLocation NameLoc, 6641 AttributeList *Attr, AccessSpecifier AS, 6642 MultiTemplateParamsArg TemplateParameterLists, 6643 bool &OwnedDecl, bool &IsDependent, 6644 bool ScopedEnum, bool ScopedEnumUsesClassTag, 6645 TypeResult UnderlyingType) { 6646 // If this is not a definition, it must have a name. 6647 assert((Name != 0 || TUK == TUK_Definition) && 6648 "Nameless record must be a definition!"); 6649 assert(TemplateParameterLists.size() == 0 || TUK != TUK_Reference); 6650 6651 OwnedDecl = false; 6652 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 6653 6654 // FIXME: Check explicit specializations more carefully. 6655 bool isExplicitSpecialization = false; 6656 bool Invalid = false; 6657 6658 // We only need to do this matching if we have template parameters 6659 // or a scope specifier, which also conveniently avoids this work 6660 // for non-C++ cases. 6661 if (TemplateParameterLists.size() > 0 || 6662 (SS.isNotEmpty() && TUK != TUK_Reference)) { 6663 if (TemplateParameterList *TemplateParams 6664 = MatchTemplateParametersToScopeSpecifier(KWLoc, NameLoc, SS, 6665 TemplateParameterLists.get(), 6666 TemplateParameterLists.size(), 6667 TUK == TUK_Friend, 6668 isExplicitSpecialization, 6669 Invalid)) { 6670 if (TemplateParams->size() > 0) { 6671 // This is a declaration or definition of a class template (which may 6672 // be a member of another template). 6673 6674 if (Invalid) 6675 return 0; 6676 6677 OwnedDecl = false; 6678 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc, 6679 SS, Name, NameLoc, Attr, 6680 TemplateParams, AS, 6681 TemplateParameterLists.size() - 1, 6682 (TemplateParameterList**) TemplateParameterLists.release()); 6683 return Result.get(); 6684 } else { 6685 // The "template<>" header is extraneous. 6686 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 6687 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 6688 isExplicitSpecialization = true; 6689 } 6690 } 6691 } 6692 6693 // Figure out the underlying type if this a enum declaration. We need to do 6694 // this early, because it's needed to detect if this is an incompatible 6695 // redeclaration. 6696 llvm::PointerUnion<const Type*, TypeSourceInfo*> EnumUnderlying; 6697 6698 if (Kind == TTK_Enum) { 6699 if (UnderlyingType.isInvalid() || (!UnderlyingType.get() && ScopedEnum)) 6700 // No underlying type explicitly specified, or we failed to parse the 6701 // type, default to int. 6702 EnumUnderlying = Context.IntTy.getTypePtr(); 6703 else if (UnderlyingType.get()) { 6704 // C++0x 7.2p2: The type-specifier-seq of an enum-base shall name an 6705 // integral type; any cv-qualification is ignored. 6706 TypeSourceInfo *TI = 0; 6707 QualType T = GetTypeFromParser(UnderlyingType.get(), &TI); 6708 EnumUnderlying = TI; 6709 6710 SourceLocation UnderlyingLoc = TI->getTypeLoc().getBeginLoc(); 6711 6712 if (!T->isDependentType() && !T->isIntegralType(Context)) { 6713 Diag(UnderlyingLoc, diag::err_enum_invalid_underlying) 6714 << T; 6715 // Recover by falling back to int. 6716 EnumUnderlying = Context.IntTy.getTypePtr(); 6717 } 6718 6719 if (DiagnoseUnexpandedParameterPack(UnderlyingLoc, TI, 6720 UPPC_FixedUnderlyingType)) 6721 EnumUnderlying = Context.IntTy.getTypePtr(); 6722 6723 } else if (getLangOptions().Microsoft) 6724 // Microsoft enums are always of int type. 6725 EnumUnderlying = Context.IntTy.getTypePtr(); 6726 } 6727 6728 DeclContext *SearchDC = CurContext; 6729 DeclContext *DC = CurContext; 6730 bool isStdBadAlloc = false; 6731 6732 RedeclarationKind Redecl = ForRedeclaration; 6733 if (TUK == TUK_Friend || TUK == TUK_Reference) 6734 Redecl = NotForRedeclaration; 6735 6736 LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl); 6737 6738 if (Name && SS.isNotEmpty()) { 6739 // We have a nested-name tag ('struct foo::bar'). 6740 6741 // Check for invalid 'foo::'. 6742 if (SS.isInvalid()) { 6743 Name = 0; 6744 goto CreateNewDecl; 6745 } 6746 6747 // If this is a friend or a reference to a class in a dependent 6748 // context, don't try to make a decl for it. 6749 if (TUK == TUK_Friend || TUK == TUK_Reference) { 6750 DC = computeDeclContext(SS, false); 6751 if (!DC) { 6752 IsDependent = true; 6753 return 0; 6754 } 6755 } else { 6756 DC = computeDeclContext(SS, true); 6757 if (!DC) { 6758 Diag(SS.getRange().getBegin(), diag::err_dependent_nested_name_spec) 6759 << SS.getRange(); 6760 return 0; 6761 } 6762 } 6763 6764 if (RequireCompleteDeclContext(SS, DC)) 6765 return 0; 6766 6767 SearchDC = DC; 6768 // Look-up name inside 'foo::'. 6769 LookupQualifiedName(Previous, DC); 6770 6771 if (Previous.isAmbiguous()) 6772 return 0; 6773 6774 if (Previous.empty()) { 6775 // Name lookup did not find anything. However, if the 6776 // nested-name-specifier refers to the current instantiation, 6777 // and that current instantiation has any dependent base 6778 // classes, we might find something at instantiation time: treat 6779 // this as a dependent elaborated-type-specifier. 6780 // But this only makes any sense for reference-like lookups. 6781 if (Previous.wasNotFoundInCurrentInstantiation() && 6782 (TUK == TUK_Reference || TUK == TUK_Friend)) { 6783 IsDependent = true; 6784 return 0; 6785 } 6786 6787 // A tag 'foo::bar' must already exist. 6788 Diag(NameLoc, diag::err_not_tag_in_scope) 6789 << Kind << Name << DC << SS.getRange(); 6790 Name = 0; 6791 Invalid = true; 6792 goto CreateNewDecl; 6793 } 6794 } else if (Name) { 6795 // If this is a named struct, check to see if there was a previous forward 6796 // declaration or definition. 6797 // FIXME: We're looking into outer scopes here, even when we 6798 // shouldn't be. Doing so can result in ambiguities that we 6799 // shouldn't be diagnosing. 6800 LookupName(Previous, S); 6801 6802 if (Previous.isAmbiguous() && 6803 (TUK == TUK_Definition || TUK == TUK_Declaration)) { 6804 LookupResult::Filter F = Previous.makeFilter(); 6805 while (F.hasNext()) { 6806 NamedDecl *ND = F.next(); 6807 if (ND->getDeclContext()->getRedeclContext() != SearchDC) 6808 F.erase(); 6809 } 6810 F.done(); 6811 } 6812 6813 // Note: there used to be some attempt at recovery here. 6814 if (Previous.isAmbiguous()) 6815 return 0; 6816 6817 if (!getLangOptions().CPlusPlus && TUK != TUK_Reference) { 6818 // FIXME: This makes sure that we ignore the contexts associated 6819 // with C structs, unions, and enums when looking for a matching 6820 // tag declaration or definition. See the similar lookup tweak 6821 // in Sema::LookupName; is there a better way to deal with this? 6822 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 6823 SearchDC = SearchDC->getParent(); 6824 } 6825 } else if (S->isFunctionPrototypeScope()) { 6826 // If this is an enum declaration in function prototype scope, set its 6827 // initial context to the translation unit. 6828 SearchDC = Context.getTranslationUnitDecl(); 6829 } 6830 6831 if (Previous.isSingleResult() && 6832 Previous.getFoundDecl()->isTemplateParameter()) { 6833 // Maybe we will complain about the shadowed template parameter. 6834 DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl()); 6835 // Just pretend that we didn't see the previous declaration. 6836 Previous.clear(); 6837 } 6838 6839 if (getLangOptions().CPlusPlus && Name && DC && StdNamespace && 6840 DC->Equals(getStdNamespace()) && Name->isStr("bad_alloc")) { 6841 // This is a declaration of or a reference to "std::bad_alloc". 6842 isStdBadAlloc = true; 6843 6844 if (Previous.empty() && StdBadAlloc) { 6845 // std::bad_alloc has been implicitly declared (but made invisible to 6846 // name lookup). Fill in this implicit declaration as the previous 6847 // declaration, so that the declarations get chained appropriately. 6848 Previous.addDecl(getStdBadAlloc()); 6849 } 6850 } 6851 6852 // If we didn't find a previous declaration, and this is a reference 6853 // (or friend reference), move to the correct scope. In C++, we 6854 // also need to do a redeclaration lookup there, just in case 6855 // there's a shadow friend decl. 6856 if (Name && Previous.empty() && 6857 (TUK == TUK_Reference || TUK == TUK_Friend)) { 6858 if (Invalid) goto CreateNewDecl; 6859 assert(SS.isEmpty()); 6860 6861 if (TUK == TUK_Reference) { 6862 // C++ [basic.scope.pdecl]p5: 6863 // -- for an elaborated-type-specifier of the form 6864 // 6865 // class-key identifier 6866 // 6867 // if the elaborated-type-specifier is used in the 6868 // decl-specifier-seq or parameter-declaration-clause of a 6869 // function defined in namespace scope, the identifier is 6870 // declared as a class-name in the namespace that contains 6871 // the declaration; otherwise, except as a friend 6872 // declaration, the identifier is declared in the smallest 6873 // non-class, non-function-prototype scope that contains the 6874 // declaration. 6875 // 6876 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 6877 // C structs and unions. 6878 // 6879 // It is an error in C++ to declare (rather than define) an enum 6880 // type, including via an elaborated type specifier. We'll 6881 // diagnose that later; for now, declare the enum in the same 6882 // scope as we would have picked for any other tag type. 6883 // 6884 // GNU C also supports this behavior as part of its incomplete 6885 // enum types extension, while GNU C++ does not. 6886 // 6887 // Find the context where we'll be declaring the tag. 6888 // FIXME: We would like to maintain the current DeclContext as the 6889 // lexical context, 6890 while (SearchDC->isRecord() || SearchDC->isTransparentContext()) 6891 SearchDC = SearchDC->getParent(); 6892 6893 // Find the scope where we'll be declaring the tag. 6894 while (S->isClassScope() || 6895 (getLangOptions().CPlusPlus && 6896 S->isFunctionPrototypeScope()) || 6897 ((S->getFlags() & Scope::DeclScope) == 0) || 6898 (S->getEntity() && 6899 ((DeclContext *)S->getEntity())->isTransparentContext())) 6900 S = S->getParent(); 6901 } else { 6902 assert(TUK == TUK_Friend); 6903 // C++ [namespace.memdef]p3: 6904 // If a friend declaration in a non-local class first declares a 6905 // class or function, the friend class or function is a member of 6906 // the innermost enclosing namespace. 6907 SearchDC = SearchDC->getEnclosingNamespaceContext(); 6908 } 6909 6910 // In C++, we need to do a redeclaration lookup to properly 6911 // diagnose some problems. 6912 if (getLangOptions().CPlusPlus) { 6913 Previous.setRedeclarationKind(ForRedeclaration); 6914 LookupQualifiedName(Previous, SearchDC); 6915 } 6916 } 6917 6918 if (!Previous.empty()) { 6919 NamedDecl *PrevDecl = (*Previous.begin())->getUnderlyingDecl(); 6920 6921 // It's okay to have a tag decl in the same scope as a typedef 6922 // which hides a tag decl in the same scope. Finding this 6923 // insanity with a redeclaration lookup can only actually happen 6924 // in C++. 6925 // 6926 // This is also okay for elaborated-type-specifiers, which is 6927 // technically forbidden by the current standard but which is 6928 // okay according to the likely resolution of an open issue; 6929 // see http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#407 6930 if (getLangOptions().CPlusPlus) { 6931 if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(PrevDecl)) { 6932 if (const TagType *TT = TD->getUnderlyingType()->getAs<TagType>()) { 6933 TagDecl *Tag = TT->getDecl(); 6934 if (Tag->getDeclName() == Name && 6935 Tag->getDeclContext()->getRedeclContext() 6936 ->Equals(TD->getDeclContext()->getRedeclContext())) { 6937 PrevDecl = Tag; 6938 Previous.clear(); 6939 Previous.addDecl(Tag); 6940 Previous.resolveKind(); 6941 } 6942 } 6943 } 6944 } 6945 6946 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 6947 // If this is a use of a previous tag, or if the tag is already declared 6948 // in the same scope (so that the definition/declaration completes or 6949 // rementions the tag), reuse the decl. 6950 if (TUK == TUK_Reference || TUK == TUK_Friend || 6951 isDeclInScope(PrevDecl, SearchDC, S, isExplicitSpecialization)) { 6952 // Make sure that this wasn't declared as an enum and now used as a 6953 // struct or something similar. 6954 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, KWLoc, *Name)) { 6955 bool SafeToContinue 6956 = (PrevTagDecl->getTagKind() != TTK_Enum && 6957 Kind != TTK_Enum); 6958 if (SafeToContinue) 6959 Diag(KWLoc, diag::err_use_with_wrong_tag) 6960 << Name 6961 << FixItHint::CreateReplacement(SourceRange(KWLoc), 6962 PrevTagDecl->getKindName()); 6963 else 6964 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 6965 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 6966 6967 if (SafeToContinue) 6968 Kind = PrevTagDecl->getTagKind(); 6969 else { 6970 // Recover by making this an anonymous redefinition. 6971 Name = 0; 6972 Previous.clear(); 6973 Invalid = true; 6974 } 6975 } 6976 6977 if (Kind == TTK_Enum && PrevTagDecl->getTagKind() == TTK_Enum) { 6978 const EnumDecl *PrevEnum = cast<EnumDecl>(PrevTagDecl); 6979 6980 // All conflicts with previous declarations are recovered by 6981 // returning the previous declaration. 6982 if (ScopedEnum != PrevEnum->isScoped()) { 6983 Diag(KWLoc, diag::err_enum_redeclare_scoped_mismatch) 6984 << PrevEnum->isScoped(); 6985 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 6986 return PrevTagDecl; 6987 } 6988 else if (EnumUnderlying && PrevEnum->isFixed()) { 6989 QualType T; 6990 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 6991 T = TI->getType(); 6992 else 6993 T = QualType(EnumUnderlying.get<const Type*>(), 0); 6994 6995 if (!Context.hasSameUnqualifiedType(T, PrevEnum->getIntegerType())) { 6996 Diag(NameLoc.isValid() ? NameLoc : KWLoc, 6997 diag::err_enum_redeclare_type_mismatch) 6998 << T 6999 << PrevEnum->getIntegerType(); 7000 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7001 return PrevTagDecl; 7002 } 7003 } 7004 else if (!EnumUnderlying.isNull() != PrevEnum->isFixed()) { 7005 Diag(KWLoc, diag::err_enum_redeclare_fixed_mismatch) 7006 << PrevEnum->isFixed(); 7007 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7008 return PrevTagDecl; 7009 } 7010 } 7011 7012 if (!Invalid) { 7013 // If this is a use, just return the declaration we found. 7014 7015 // FIXME: In the future, return a variant or some other clue 7016 // for the consumer of this Decl to know it doesn't own it. 7017 // For our current ASTs this shouldn't be a problem, but will 7018 // need to be changed with DeclGroups. 7019 if ((TUK == TUK_Reference && (!PrevTagDecl->getFriendObjectKind() || 7020 getLangOptions().Microsoft)) || TUK == TUK_Friend) 7021 return PrevTagDecl; 7022 7023 // Diagnose attempts to redefine a tag. 7024 if (TUK == TUK_Definition) { 7025 if (TagDecl *Def = PrevTagDecl->getDefinition()) { 7026 // If we're defining a specialization and the previous definition 7027 // is from an implicit instantiation, don't emit an error 7028 // here; we'll catch this in the general case below. 7029 if (!isExplicitSpecialization || 7030 !isa<CXXRecordDecl>(Def) || 7031 cast<CXXRecordDecl>(Def)->getTemplateSpecializationKind() 7032 == TSK_ExplicitSpecialization) { 7033 Diag(NameLoc, diag::err_redefinition) << Name; 7034 Diag(Def->getLocation(), diag::note_previous_definition); 7035 // If this is a redefinition, recover by making this 7036 // struct be anonymous, which will make any later 7037 // references get the previous definition. 7038 Name = 0; 7039 Previous.clear(); 7040 Invalid = true; 7041 } 7042 } else { 7043 // If the type is currently being defined, complain 7044 // about a nested redefinition. 7045 const TagType *Tag 7046 = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 7047 if (Tag->isBeingDefined()) { 7048 Diag(NameLoc, diag::err_nested_redefinition) << Name; 7049 Diag(PrevTagDecl->getLocation(), 7050 diag::note_previous_definition); 7051 Name = 0; 7052 Previous.clear(); 7053 Invalid = true; 7054 } 7055 } 7056 7057 // Okay, this is definition of a previously declared or referenced 7058 // tag PrevDecl. We're going to create a new Decl for it. 7059 } 7060 } 7061 // If we get here we have (another) forward declaration or we 7062 // have a definition. Just create a new decl. 7063 7064 } else { 7065 // If we get here, this is a definition of a new tag type in a nested 7066 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 7067 // new decl/type. We set PrevDecl to NULL so that the entities 7068 // have distinct types. 7069 Previous.clear(); 7070 } 7071 // If we get here, we're going to create a new Decl. If PrevDecl 7072 // is non-NULL, it's a definition of the tag declared by 7073 // PrevDecl. If it's NULL, we have a new definition. 7074 7075 7076 // Otherwise, PrevDecl is not a tag, but was found with tag 7077 // lookup. This is only actually possible in C++, where a few 7078 // things like templates still live in the tag namespace. 7079 } else { 7080 assert(getLangOptions().CPlusPlus); 7081 7082 // Use a better diagnostic if an elaborated-type-specifier 7083 // found the wrong kind of type on the first 7084 // (non-redeclaration) lookup. 7085 if ((TUK == TUK_Reference || TUK == TUK_Friend) && 7086 !Previous.isForRedeclaration()) { 7087 unsigned Kind = 0; 7088 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 7089 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 7090 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 7091 Diag(NameLoc, diag::err_tag_reference_non_tag) << Kind; 7092 Diag(PrevDecl->getLocation(), diag::note_declared_at); 7093 Invalid = true; 7094 7095 // Otherwise, only diagnose if the declaration is in scope. 7096 } else if (!isDeclInScope(PrevDecl, SearchDC, S, 7097 isExplicitSpecialization)) { 7098 // do nothing 7099 7100 // Diagnose implicit declarations introduced by elaborated types. 7101 } else if (TUK == TUK_Reference || TUK == TUK_Friend) { 7102 unsigned Kind = 0; 7103 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 7104 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 7105 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 7106 Diag(NameLoc, diag::err_tag_reference_conflict) << Kind; 7107 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 7108 Invalid = true; 7109 7110 // Otherwise it's a declaration. Call out a particularly common 7111 // case here. 7112 } else if (TypedefNameDecl *TND = dyn_cast<TypedefNameDecl>(PrevDecl)) { 7113 unsigned Kind = 0; 7114 if (isa<TypeAliasDecl>(PrevDecl)) Kind = 1; 7115 Diag(NameLoc, diag::err_tag_definition_of_typedef) 7116 << Name << Kind << TND->getUnderlyingType(); 7117 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 7118 Invalid = true; 7119 7120 // Otherwise, diagnose. 7121 } else { 7122 // The tag name clashes with something else in the target scope, 7123 // issue an error and recover by making this tag be anonymous. 7124 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 7125 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 7126 Name = 0; 7127 Invalid = true; 7128 } 7129 7130 // The existing declaration isn't relevant to us; we're in a 7131 // new scope, so clear out the previous declaration. 7132 Previous.clear(); 7133 } 7134 } 7135 7136CreateNewDecl: 7137 7138 TagDecl *PrevDecl = 0; 7139 if (Previous.isSingleResult()) 7140 PrevDecl = cast<TagDecl>(Previous.getFoundDecl()); 7141 7142 // If there is an identifier, use the location of the identifier as the 7143 // location of the decl, otherwise use the location of the struct/union 7144 // keyword. 7145 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 7146 7147 // Otherwise, create a new declaration. If there is a previous 7148 // declaration of the same entity, the two will be linked via 7149 // PrevDecl. 7150 TagDecl *New; 7151 7152 bool IsForwardReference = false; 7153 if (Kind == TTK_Enum) { 7154 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 7155 // enum X { A, B, C } D; D should chain to X. 7156 New = EnumDecl::Create(Context, SearchDC, KWLoc, Loc, Name, 7157 cast_or_null<EnumDecl>(PrevDecl), ScopedEnum, 7158 ScopedEnumUsesClassTag, !EnumUnderlying.isNull()); 7159 // If this is an undefined enum, warn. 7160 if (TUK != TUK_Definition && !Invalid) { 7161 TagDecl *Def; 7162 if (getLangOptions().CPlusPlus0x && cast<EnumDecl>(New)->isFixed()) { 7163 // C++0x: 7.2p2: opaque-enum-declaration. 7164 // Conflicts are diagnosed above. Do nothing. 7165 } 7166 else if (PrevDecl && (Def = cast<EnumDecl>(PrevDecl)->getDefinition())) { 7167 Diag(Loc, diag::ext_forward_ref_enum_def) 7168 << New; 7169 Diag(Def->getLocation(), diag::note_previous_definition); 7170 } else { 7171 unsigned DiagID = diag::ext_forward_ref_enum; 7172 if (getLangOptions().Microsoft) 7173 DiagID = diag::ext_ms_forward_ref_enum; 7174 else if (getLangOptions().CPlusPlus) 7175 DiagID = diag::err_forward_ref_enum; 7176 Diag(Loc, DiagID); 7177 7178 // If this is a forward-declared reference to an enumeration, make a 7179 // note of it; we won't actually be introducing the declaration into 7180 // the declaration context. 7181 if (TUK == TUK_Reference) 7182 IsForwardReference = true; 7183 } 7184 } 7185 7186 if (EnumUnderlying) { 7187 EnumDecl *ED = cast<EnumDecl>(New); 7188 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 7189 ED->setIntegerTypeSourceInfo(TI); 7190 else 7191 ED->setIntegerType(QualType(EnumUnderlying.get<const Type*>(), 0)); 7192 ED->setPromotionType(ED->getIntegerType()); 7193 } 7194 7195 } else { 7196 // struct/union/class 7197 7198 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 7199 // struct X { int A; } D; D should chain to X. 7200 if (getLangOptions().CPlusPlus) { 7201 // FIXME: Look for a way to use RecordDecl for simple structs. 7202 New = CXXRecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 7203 cast_or_null<CXXRecordDecl>(PrevDecl)); 7204 7205 if (isStdBadAlloc && (!StdBadAlloc || getStdBadAlloc()->isImplicit())) 7206 StdBadAlloc = cast<CXXRecordDecl>(New); 7207 } else 7208 New = RecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 7209 cast_or_null<RecordDecl>(PrevDecl)); 7210 } 7211 7212 // Maybe add qualifier info. 7213 if (SS.isNotEmpty()) { 7214 if (SS.isSet()) { 7215 New->setQualifierInfo(SS.getWithLocInContext(Context)); 7216 if (TemplateParameterLists.size() > 0) { 7217 New->setTemplateParameterListsInfo(Context, 7218 TemplateParameterLists.size(), 7219 (TemplateParameterList**) TemplateParameterLists.release()); 7220 } 7221 } 7222 else 7223 Invalid = true; 7224 } 7225 7226 if (RecordDecl *RD = dyn_cast<RecordDecl>(New)) { 7227 // Add alignment attributes if necessary; these attributes are checked when 7228 // the ASTContext lays out the structure. 7229 // 7230 // It is important for implementing the correct semantics that this 7231 // happen here (in act on tag decl). The #pragma pack stack is 7232 // maintained as a result of parser callbacks which can occur at 7233 // many points during the parsing of a struct declaration (because 7234 // the #pragma tokens are effectively skipped over during the 7235 // parsing of the struct). 7236 AddAlignmentAttributesForRecord(RD); 7237 7238 AddMsStructLayoutForRecord(RD); 7239 } 7240 7241 // If this is a specialization of a member class (of a class template), 7242 // check the specialization. 7243 if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous)) 7244 Invalid = true; 7245 7246 if (Invalid) 7247 New->setInvalidDecl(); 7248 7249 if (Attr) 7250 ProcessDeclAttributeList(S, New, Attr); 7251 7252 // If we're declaring or defining a tag in function prototype scope 7253 // in C, note that this type can only be used within the function. 7254 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 7255 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 7256 7257 // Set the lexical context. If the tag has a C++ scope specifier, the 7258 // lexical context will be different from the semantic context. 7259 New->setLexicalDeclContext(CurContext); 7260 7261 // Mark this as a friend decl if applicable. 7262 // In Microsoft mode, a friend declaration also acts as a forward 7263 // declaration so we always pass true to setObjectOfFriendDecl to make 7264 // the tag name visible. 7265 if (TUK == TUK_Friend) 7266 New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ !Previous.empty() || 7267 getLangOptions().Microsoft); 7268 7269 // Set the access specifier. 7270 if (!Invalid && SearchDC->isRecord()) 7271 SetMemberAccessSpecifier(New, PrevDecl, AS); 7272 7273 if (TUK == TUK_Definition) 7274 New->startDefinition(); 7275 7276 // If this has an identifier, add it to the scope stack. 7277 if (TUK == TUK_Friend) { 7278 // We might be replacing an existing declaration in the lookup tables; 7279 // if so, borrow its access specifier. 7280 if (PrevDecl) 7281 New->setAccess(PrevDecl->getAccess()); 7282 7283 DeclContext *DC = New->getDeclContext()->getRedeclContext(); 7284 DC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 7285 if (Name) // can be null along some error paths 7286 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 7287 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false); 7288 } else if (Name) { 7289 S = getNonFieldDeclScope(S); 7290 PushOnScopeChains(New, S, !IsForwardReference); 7291 if (IsForwardReference) 7292 SearchDC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 7293 7294 } else { 7295 CurContext->addDecl(New); 7296 } 7297 7298 // If this is the C FILE type, notify the AST context. 7299 if (IdentifierInfo *II = New->getIdentifier()) 7300 if (!New->isInvalidDecl() && 7301 New->getDeclContext()->getRedeclContext()->isTranslationUnit() && 7302 II->isStr("FILE")) 7303 Context.setFILEDecl(New); 7304 7305 OwnedDecl = true; 7306 return New; 7307} 7308 7309void Sema::ActOnTagStartDefinition(Scope *S, Decl *TagD) { 7310 AdjustDeclIfTemplate(TagD); 7311 TagDecl *Tag = cast<TagDecl>(TagD); 7312 7313 // Enter the tag context. 7314 PushDeclContext(S, Tag); 7315} 7316 7317void Sema::ActOnStartCXXMemberDeclarations(Scope *S, Decl *TagD, 7318 SourceLocation FinalLoc, 7319 SourceLocation LBraceLoc) { 7320 AdjustDeclIfTemplate(TagD); 7321 CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD); 7322 7323 FieldCollector->StartClass(); 7324 7325 if (!Record->getIdentifier()) 7326 return; 7327 7328 if (FinalLoc.isValid()) 7329 Record->addAttr(new (Context) FinalAttr(FinalLoc, Context)); 7330 7331 // C++ [class]p2: 7332 // [...] The class-name is also inserted into the scope of the 7333 // class itself; this is known as the injected-class-name. For 7334 // purposes of access checking, the injected-class-name is treated 7335 // as if it were a public member name. 7336 CXXRecordDecl *InjectedClassName 7337 = CXXRecordDecl::Create(Context, Record->getTagKind(), CurContext, 7338 Record->getLocStart(), Record->getLocation(), 7339 Record->getIdentifier(), 7340 /*PrevDecl=*/0, 7341 /*DelayTypeCreation=*/true); 7342 Context.getTypeDeclType(InjectedClassName, Record); 7343 InjectedClassName->setImplicit(); 7344 InjectedClassName->setAccess(AS_public); 7345 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 7346 InjectedClassName->setDescribedClassTemplate(Template); 7347 PushOnScopeChains(InjectedClassName, S); 7348 assert(InjectedClassName->isInjectedClassName() && 7349 "Broken injected-class-name"); 7350} 7351 7352void Sema::ActOnTagFinishDefinition(Scope *S, Decl *TagD, 7353 SourceLocation RBraceLoc) { 7354 AdjustDeclIfTemplate(TagD); 7355 TagDecl *Tag = cast<TagDecl>(TagD); 7356 Tag->setRBraceLoc(RBraceLoc); 7357 7358 if (isa<CXXRecordDecl>(Tag)) 7359 FieldCollector->FinishClass(); 7360 7361 // Exit this scope of this tag's definition. 7362 PopDeclContext(); 7363 7364 // Notify the consumer that we've defined a tag. 7365 Consumer.HandleTagDeclDefinition(Tag); 7366} 7367 7368void Sema::ActOnTagDefinitionError(Scope *S, Decl *TagD) { 7369 AdjustDeclIfTemplate(TagD); 7370 TagDecl *Tag = cast<TagDecl>(TagD); 7371 Tag->setInvalidDecl(); 7372 7373 // We're undoing ActOnTagStartDefinition here, not 7374 // ActOnStartCXXMemberDeclarations, so we don't have to mess with 7375 // the FieldCollector. 7376 7377 PopDeclContext(); 7378} 7379 7380// Note that FieldName may be null for anonymous bitfields. 7381bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName, 7382 QualType FieldTy, const Expr *BitWidth, 7383 bool *ZeroWidth) { 7384 // Default to true; that shouldn't confuse checks for emptiness 7385 if (ZeroWidth) 7386 *ZeroWidth = true; 7387 7388 // C99 6.7.2.1p4 - verify the field type. 7389 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 7390 if (!FieldTy->isDependentType() && !FieldTy->isIntegralOrEnumerationType()) { 7391 // Handle incomplete types with specific error. 7392 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 7393 return true; 7394 if (FieldName) 7395 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 7396 << FieldName << FieldTy << BitWidth->getSourceRange(); 7397 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) 7398 << FieldTy << BitWidth->getSourceRange(); 7399 } else if (DiagnoseUnexpandedParameterPack(const_cast<Expr *>(BitWidth), 7400 UPPC_BitFieldWidth)) 7401 return true; 7402 7403 // If the bit-width is type- or value-dependent, don't try to check 7404 // it now. 7405 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 7406 return false; 7407 7408 llvm::APSInt Value; 7409 if (VerifyIntegerConstantExpression(BitWidth, &Value)) 7410 return true; 7411 7412 if (Value != 0 && ZeroWidth) 7413 *ZeroWidth = false; 7414 7415 // Zero-width bitfield is ok for anonymous field. 7416 if (Value == 0 && FieldName) 7417 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 7418 7419 if (Value.isSigned() && Value.isNegative()) { 7420 if (FieldName) 7421 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 7422 << FieldName << Value.toString(10); 7423 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) 7424 << Value.toString(10); 7425 } 7426 7427 if (!FieldTy->isDependentType()) { 7428 uint64_t TypeSize = Context.getTypeSize(FieldTy); 7429 if (Value.getZExtValue() > TypeSize) { 7430 if (!getLangOptions().CPlusPlus) { 7431 if (FieldName) 7432 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 7433 << FieldName << (unsigned)Value.getZExtValue() 7434 << (unsigned)TypeSize; 7435 7436 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) 7437 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 7438 } 7439 7440 if (FieldName) 7441 Diag(FieldLoc, diag::warn_bitfield_width_exceeds_type_size) 7442 << FieldName << (unsigned)Value.getZExtValue() 7443 << (unsigned)TypeSize; 7444 else 7445 Diag(FieldLoc, diag::warn_anon_bitfield_width_exceeds_type_size) 7446 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 7447 } 7448 } 7449 7450 return false; 7451} 7452 7453/// ActOnField - Each field of a struct/union/class is passed into this in order 7454/// to create a FieldDecl object for it. 7455Decl *Sema::ActOnField(Scope *S, Decl *TagD, 7456 SourceLocation DeclStart, 7457 Declarator &D, ExprTy *BitfieldWidth) { 7458 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD), 7459 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 7460 AS_public); 7461 return Res; 7462} 7463 7464/// HandleField - Analyze a field of a C struct or a C++ data member. 7465/// 7466FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 7467 SourceLocation DeclStart, 7468 Declarator &D, Expr *BitWidth, 7469 AccessSpecifier AS) { 7470 IdentifierInfo *II = D.getIdentifier(); 7471 SourceLocation Loc = DeclStart; 7472 if (II) Loc = D.getIdentifierLoc(); 7473 7474 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 7475 QualType T = TInfo->getType(); 7476 if (getLangOptions().CPlusPlus) { 7477 CheckExtraCXXDefaultArguments(D); 7478 7479 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 7480 UPPC_DataMemberType)) { 7481 D.setInvalidType(); 7482 T = Context.IntTy; 7483 TInfo = Context.getTrivialTypeSourceInfo(T, Loc); 7484 } 7485 } 7486 7487 DiagnoseFunctionSpecifiers(D); 7488 7489 if (D.getDeclSpec().isThreadSpecified()) 7490 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 7491 7492 // Check to see if this name was declared as a member previously 7493 LookupResult Previous(*this, II, Loc, LookupMemberName, ForRedeclaration); 7494 LookupName(Previous, S); 7495 assert((Previous.empty() || Previous.isOverloadedResult() || 7496 Previous.isSingleResult()) 7497 && "Lookup of member name should be either overloaded, single or null"); 7498 7499 // If the name is overloaded then get any declaration else get the single result 7500 NamedDecl *PrevDecl = Previous.isOverloadedResult() ? 7501 Previous.getRepresentativeDecl() : Previous.getAsSingle<NamedDecl>(); 7502 7503 if (PrevDecl && PrevDecl->isTemplateParameter()) { 7504 // Maybe we will complain about the shadowed template parameter. 7505 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 7506 // Just pretend that we didn't see the previous declaration. 7507 PrevDecl = 0; 7508 } 7509 7510 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 7511 PrevDecl = 0; 7512 7513 bool Mutable 7514 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable); 7515 SourceLocation TSSL = D.getSourceRange().getBegin(); 7516 FieldDecl *NewFD 7517 = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, TSSL, 7518 AS, PrevDecl, &D); 7519 7520 if (NewFD->isInvalidDecl()) 7521 Record->setInvalidDecl(); 7522 7523 if (NewFD->isInvalidDecl() && PrevDecl) { 7524 // Don't introduce NewFD into scope; there's already something 7525 // with the same name in the same scope. 7526 } else if (II) { 7527 PushOnScopeChains(NewFD, S); 7528 } else 7529 Record->addDecl(NewFD); 7530 7531 return NewFD; 7532} 7533 7534/// \brief Build a new FieldDecl and check its well-formedness. 7535/// 7536/// This routine builds a new FieldDecl given the fields name, type, 7537/// record, etc. \p PrevDecl should refer to any previous declaration 7538/// with the same name and in the same scope as the field to be 7539/// created. 7540/// 7541/// \returns a new FieldDecl. 7542/// 7543/// \todo The Declarator argument is a hack. It will be removed once 7544FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 7545 TypeSourceInfo *TInfo, 7546 RecordDecl *Record, SourceLocation Loc, 7547 bool Mutable, Expr *BitWidth, 7548 SourceLocation TSSL, 7549 AccessSpecifier AS, NamedDecl *PrevDecl, 7550 Declarator *D) { 7551 IdentifierInfo *II = Name.getAsIdentifierInfo(); 7552 bool InvalidDecl = false; 7553 if (D) InvalidDecl = D->isInvalidType(); 7554 7555 // If we receive a broken type, recover by assuming 'int' and 7556 // marking this declaration as invalid. 7557 if (T.isNull()) { 7558 InvalidDecl = true; 7559 T = Context.IntTy; 7560 } 7561 7562 QualType EltTy = Context.getBaseElementType(T); 7563 if (!EltTy->isDependentType() && 7564 RequireCompleteType(Loc, EltTy, diag::err_field_incomplete)) { 7565 // Fields of incomplete type force their record to be invalid. 7566 Record->setInvalidDecl(); 7567 InvalidDecl = true; 7568 } 7569 7570 // C99 6.7.2.1p8: A member of a structure or union may have any type other 7571 // than a variably modified type. 7572 if (!InvalidDecl && T->isVariablyModifiedType()) { 7573 bool SizeIsNegative; 7574 llvm::APSInt Oversized; 7575 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 7576 SizeIsNegative, 7577 Oversized); 7578 if (!FixedTy.isNull()) { 7579 Diag(Loc, diag::warn_illegal_constant_array_size); 7580 T = FixedTy; 7581 } else { 7582 if (SizeIsNegative) 7583 Diag(Loc, diag::err_typecheck_negative_array_size); 7584 else if (Oversized.getBoolValue()) 7585 Diag(Loc, diag::err_array_too_large) 7586 << Oversized.toString(10); 7587 else 7588 Diag(Loc, diag::err_typecheck_field_variable_size); 7589 InvalidDecl = true; 7590 } 7591 } 7592 7593 // Fields can not have abstract class types 7594 if (!InvalidDecl && RequireNonAbstractType(Loc, T, 7595 diag::err_abstract_type_in_decl, 7596 AbstractFieldType)) 7597 InvalidDecl = true; 7598 7599 bool ZeroWidth = false; 7600 // If this is declared as a bit-field, check the bit-field. 7601 if (!InvalidDecl && BitWidth && 7602 VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth)) { 7603 InvalidDecl = true; 7604 BitWidth = 0; 7605 ZeroWidth = false; 7606 } 7607 7608 // Check that 'mutable' is consistent with the type of the declaration. 7609 if (!InvalidDecl && Mutable) { 7610 unsigned DiagID = 0; 7611 if (T->isReferenceType()) 7612 DiagID = diag::err_mutable_reference; 7613 else if (T.isConstQualified()) 7614 DiagID = diag::err_mutable_const; 7615 7616 if (DiagID) { 7617 SourceLocation ErrLoc = Loc; 7618 if (D && D->getDeclSpec().getStorageClassSpecLoc().isValid()) 7619 ErrLoc = D->getDeclSpec().getStorageClassSpecLoc(); 7620 Diag(ErrLoc, DiagID); 7621 Mutable = false; 7622 InvalidDecl = true; 7623 } 7624 } 7625 7626 FieldDecl *NewFD = FieldDecl::Create(Context, Record, TSSL, Loc, II, T, TInfo, 7627 BitWidth, Mutable); 7628 if (InvalidDecl) 7629 NewFD->setInvalidDecl(); 7630 7631 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 7632 Diag(Loc, diag::err_duplicate_member) << II; 7633 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 7634 NewFD->setInvalidDecl(); 7635 } 7636 7637 if (!InvalidDecl && getLangOptions().CPlusPlus) { 7638 if (Record->isUnion()) { 7639 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 7640 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 7641 if (RDecl->getDefinition()) { 7642 // C++ [class.union]p1: An object of a class with a non-trivial 7643 // constructor, a non-trivial copy constructor, a non-trivial 7644 // destructor, or a non-trivial copy assignment operator 7645 // cannot be a member of a union, nor can an array of such 7646 // objects. 7647 if (!getLangOptions().CPlusPlus0x && CheckNontrivialField(NewFD)) 7648 NewFD->setInvalidDecl(); 7649 } 7650 } 7651 7652 // C++ [class.union]p1: If a union contains a member of reference type, 7653 // the program is ill-formed. 7654 if (EltTy->isReferenceType()) { 7655 Diag(NewFD->getLocation(), diag::err_union_member_of_reference_type) 7656 << NewFD->getDeclName() << EltTy; 7657 NewFD->setInvalidDecl(); 7658 } 7659 } 7660 } 7661 7662 // FIXME: We need to pass in the attributes given an AST 7663 // representation, not a parser representation. 7664 if (D) 7665 // FIXME: What to pass instead of TUScope? 7666 ProcessDeclAttributes(TUScope, NewFD, *D); 7667 7668 if (T.isObjCGCWeak()) 7669 Diag(Loc, diag::warn_attribute_weak_on_field); 7670 7671 NewFD->setAccess(AS); 7672 return NewFD; 7673} 7674 7675bool Sema::CheckNontrivialField(FieldDecl *FD) { 7676 assert(FD); 7677 assert(getLangOptions().CPlusPlus && "valid check only for C++"); 7678 7679 if (FD->isInvalidDecl()) 7680 return true; 7681 7682 QualType EltTy = Context.getBaseElementType(FD->getType()); 7683 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 7684 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 7685 if (RDecl->getDefinition()) { 7686 // We check for copy constructors before constructors 7687 // because otherwise we'll never get complaints about 7688 // copy constructors. 7689 7690 CXXSpecialMember member = CXXInvalid; 7691 if (!RDecl->hasTrivialCopyConstructor()) 7692 member = CXXCopyConstructor; 7693 else if (!RDecl->hasTrivialDefaultConstructor()) 7694 member = CXXDefaultConstructor; 7695 else if (!RDecl->hasTrivialCopyAssignment()) 7696 member = CXXCopyAssignment; 7697 else if (!RDecl->hasTrivialDestructor()) 7698 member = CXXDestructor; 7699 7700 if (member != CXXInvalid) { 7701 Diag(FD->getLocation(), diag::err_illegal_union_or_anon_struct_member) 7702 << (int)FD->getParent()->isUnion() << FD->getDeclName() << member; 7703 DiagnoseNontrivial(RT, member); 7704 return true; 7705 } 7706 } 7707 } 7708 7709 return false; 7710} 7711 7712/// DiagnoseNontrivial - Given that a class has a non-trivial 7713/// special member, figure out why. 7714void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) { 7715 QualType QT(T, 0U); 7716 CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl()); 7717 7718 // Check whether the member was user-declared. 7719 switch (member) { 7720 case CXXInvalid: 7721 break; 7722 7723 case CXXDefaultConstructor: 7724 if (RD->hasUserDeclaredConstructor()) { 7725 typedef CXXRecordDecl::ctor_iterator ctor_iter; 7726 for (ctor_iter ci = RD->ctor_begin(), ce = RD->ctor_end(); ci != ce;++ci){ 7727 const FunctionDecl *body = 0; 7728 ci->hasBody(body); 7729 if (!body || !cast<CXXConstructorDecl>(body)->isImplicitlyDefined()) { 7730 SourceLocation CtorLoc = ci->getLocation(); 7731 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 7732 return; 7733 } 7734 } 7735 7736 assert(0 && "found no user-declared constructors"); 7737 return; 7738 } 7739 break; 7740 7741 case CXXCopyConstructor: 7742 if (RD->hasUserDeclaredCopyConstructor()) { 7743 SourceLocation CtorLoc = 7744 RD->getCopyConstructor(0)->getLocation(); 7745 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 7746 return; 7747 } 7748 break; 7749 7750 case CXXMoveConstructor: 7751 if (RD->hasUserDeclaredMoveConstructor()) { 7752 SourceLocation CtorLoc = RD->getMoveConstructor()->getLocation(); 7753 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 7754 return; 7755 } 7756 break; 7757 7758 case CXXCopyAssignment: 7759 if (RD->hasUserDeclaredCopyAssignment()) { 7760 // FIXME: this should use the location of the copy 7761 // assignment, not the type. 7762 SourceLocation TyLoc = RD->getSourceRange().getBegin(); 7763 Diag(TyLoc, diag::note_nontrivial_user_defined) << QT << member; 7764 return; 7765 } 7766 break; 7767 7768 case CXXMoveAssignment: 7769 if (RD->hasUserDeclaredMoveAssignment()) { 7770 SourceLocation AssignLoc = RD->getMoveAssignmentOperator()->getLocation(); 7771 Diag(AssignLoc, diag::note_nontrivial_user_defined) << QT << member; 7772 return; 7773 } 7774 break; 7775 7776 case CXXDestructor: 7777 if (RD->hasUserDeclaredDestructor()) { 7778 SourceLocation DtorLoc = LookupDestructor(RD)->getLocation(); 7779 Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member; 7780 return; 7781 } 7782 break; 7783 } 7784 7785 typedef CXXRecordDecl::base_class_iterator base_iter; 7786 7787 // Virtual bases and members inhibit trivial copying/construction, 7788 // but not trivial destruction. 7789 if (member != CXXDestructor) { 7790 // Check for virtual bases. vbases includes indirect virtual bases, 7791 // so we just iterate through the direct bases. 7792 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) 7793 if (bi->isVirtual()) { 7794 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 7795 Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1; 7796 return; 7797 } 7798 7799 // Check for virtual methods. 7800 typedef CXXRecordDecl::method_iterator meth_iter; 7801 for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me; 7802 ++mi) { 7803 if (mi->isVirtual()) { 7804 SourceLocation MLoc = mi->getSourceRange().getBegin(); 7805 Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0; 7806 return; 7807 } 7808 } 7809 } 7810 7811 bool (CXXRecordDecl::*hasTrivial)() const; 7812 switch (member) { 7813 case CXXDefaultConstructor: 7814 hasTrivial = &CXXRecordDecl::hasTrivialDefaultConstructor; break; 7815 case CXXCopyConstructor: 7816 hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break; 7817 case CXXCopyAssignment: 7818 hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break; 7819 case CXXDestructor: 7820 hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break; 7821 default: 7822 assert(0 && "unexpected special member"); return; 7823 } 7824 7825 // Check for nontrivial bases (and recurse). 7826 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) { 7827 const RecordType *BaseRT = bi->getType()->getAs<RecordType>(); 7828 assert(BaseRT && "Don't know how to handle dependent bases"); 7829 CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl()); 7830 if (!(BaseRecTy->*hasTrivial)()) { 7831 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 7832 Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member; 7833 DiagnoseNontrivial(BaseRT, member); 7834 return; 7835 } 7836 } 7837 7838 // Check for nontrivial members (and recurse). 7839 typedef RecordDecl::field_iterator field_iter; 7840 for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe; 7841 ++fi) { 7842 QualType EltTy = Context.getBaseElementType((*fi)->getType()); 7843 if (const RecordType *EltRT = EltTy->getAs<RecordType>()) { 7844 CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl()); 7845 7846 if (!(EltRD->*hasTrivial)()) { 7847 SourceLocation FLoc = (*fi)->getLocation(); 7848 Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member; 7849 DiagnoseNontrivial(EltRT, member); 7850 return; 7851 } 7852 } 7853 } 7854 7855 assert(0 && "found no explanation for non-trivial member"); 7856} 7857 7858/// TranslateIvarVisibility - Translate visibility from a token ID to an 7859/// AST enum value. 7860static ObjCIvarDecl::AccessControl 7861TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 7862 switch (ivarVisibility) { 7863 default: assert(0 && "Unknown visitibility kind"); 7864 case tok::objc_private: return ObjCIvarDecl::Private; 7865 case tok::objc_public: return ObjCIvarDecl::Public; 7866 case tok::objc_protected: return ObjCIvarDecl::Protected; 7867 case tok::objc_package: return ObjCIvarDecl::Package; 7868 } 7869} 7870 7871/// ActOnIvar - Each ivar field of an objective-c class is passed into this 7872/// in order to create an IvarDecl object for it. 7873Decl *Sema::ActOnIvar(Scope *S, 7874 SourceLocation DeclStart, 7875 Decl *IntfDecl, 7876 Declarator &D, ExprTy *BitfieldWidth, 7877 tok::ObjCKeywordKind Visibility) { 7878 7879 IdentifierInfo *II = D.getIdentifier(); 7880 Expr *BitWidth = (Expr*)BitfieldWidth; 7881 SourceLocation Loc = DeclStart; 7882 if (II) Loc = D.getIdentifierLoc(); 7883 7884 // FIXME: Unnamed fields can be handled in various different ways, for 7885 // example, unnamed unions inject all members into the struct namespace! 7886 7887 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 7888 QualType T = TInfo->getType(); 7889 7890 if (BitWidth) { 7891 // 6.7.2.1p3, 6.7.2.1p4 7892 if (VerifyBitField(Loc, II, T, BitWidth)) { 7893 D.setInvalidType(); 7894 BitWidth = 0; 7895 } 7896 } else { 7897 // Not a bitfield. 7898 7899 // validate II. 7900 7901 } 7902 if (T->isReferenceType()) { 7903 Diag(Loc, diag::err_ivar_reference_type); 7904 D.setInvalidType(); 7905 } 7906 // C99 6.7.2.1p8: A member of a structure or union may have any type other 7907 // than a variably modified type. 7908 else if (T->isVariablyModifiedType()) { 7909 Diag(Loc, diag::err_typecheck_ivar_variable_size); 7910 D.setInvalidType(); 7911 } 7912 7913 // Get the visibility (access control) for this ivar. 7914 ObjCIvarDecl::AccessControl ac = 7915 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 7916 : ObjCIvarDecl::None; 7917 // Must set ivar's DeclContext to its enclosing interface. 7918 ObjCContainerDecl *EnclosingDecl = cast<ObjCContainerDecl>(IntfDecl); 7919 ObjCContainerDecl *EnclosingContext; 7920 if (ObjCImplementationDecl *IMPDecl = 7921 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 7922 if (!LangOpts.ObjCNonFragileABI2) { 7923 // Case of ivar declared in an implementation. Context is that of its class. 7924 EnclosingContext = IMPDecl->getClassInterface(); 7925 assert(EnclosingContext && "Implementation has no class interface!"); 7926 } 7927 else 7928 EnclosingContext = EnclosingDecl; 7929 } else { 7930 if (ObjCCategoryDecl *CDecl = 7931 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 7932 if (!LangOpts.ObjCNonFragileABI2 || !CDecl->IsClassExtension()) { 7933 Diag(Loc, diag::err_misplaced_ivar) << CDecl->IsClassExtension(); 7934 return 0; 7935 } 7936 } 7937 EnclosingContext = EnclosingDecl; 7938 } 7939 7940 // Construct the decl. 7941 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, EnclosingContext, 7942 DeclStart, Loc, II, T, 7943 TInfo, ac, (Expr *)BitfieldWidth); 7944 7945 if (II) { 7946 NamedDecl *PrevDecl = LookupSingleName(S, II, Loc, LookupMemberName, 7947 ForRedeclaration); 7948 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S) 7949 && !isa<TagDecl>(PrevDecl)) { 7950 Diag(Loc, diag::err_duplicate_member) << II; 7951 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 7952 NewID->setInvalidDecl(); 7953 } 7954 } 7955 7956 // Process attributes attached to the ivar. 7957 ProcessDeclAttributes(S, NewID, D); 7958 7959 if (D.isInvalidType()) 7960 NewID->setInvalidDecl(); 7961 7962 if (II) { 7963 // FIXME: When interfaces are DeclContexts, we'll need to add 7964 // these to the interface. 7965 S->AddDecl(NewID); 7966 IdResolver.AddDecl(NewID); 7967 } 7968 7969 return NewID; 7970} 7971 7972/// ActOnLastBitfield - This routine handles synthesized bitfields rules for 7973/// class and class extensions. For every class @interface and class 7974/// extension @interface, if the last ivar is a bitfield of any type, 7975/// then add an implicit `char :0` ivar to the end of that interface. 7976void Sema::ActOnLastBitfield(SourceLocation DeclLoc, Decl *EnclosingDecl, 7977 llvm::SmallVectorImpl<Decl *> &AllIvarDecls) { 7978 if (!LangOpts.ObjCNonFragileABI2 || AllIvarDecls.empty()) 7979 return; 7980 7981 Decl *ivarDecl = AllIvarDecls[AllIvarDecls.size()-1]; 7982 ObjCIvarDecl *Ivar = cast<ObjCIvarDecl>(ivarDecl); 7983 7984 if (!Ivar->isBitField()) 7985 return; 7986 uint64_t BitFieldSize = 7987 Ivar->getBitWidth()->EvaluateAsInt(Context).getZExtValue(); 7988 if (BitFieldSize == 0) 7989 return; 7990 ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl); 7991 if (!ID) { 7992 if (ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 7993 if (!CD->IsClassExtension()) 7994 return; 7995 } 7996 // No need to add this to end of @implementation. 7997 else 7998 return; 7999 } 8000 // All conditions are met. Add a new bitfield to the tail end of ivars. 8001 llvm::APInt Zero(Context.getTypeSize(Context.CharTy), 0); 8002 Expr * BW = IntegerLiteral::Create(Context, Zero, Context.CharTy, DeclLoc); 8003 8004 Ivar = ObjCIvarDecl::Create(Context, cast<ObjCContainerDecl>(EnclosingDecl), 8005 DeclLoc, DeclLoc, 0, 8006 Context.CharTy, 8007 Context.CreateTypeSourceInfo(Context.CharTy), 8008 ObjCIvarDecl::Private, BW, 8009 true); 8010 AllIvarDecls.push_back(Ivar); 8011} 8012 8013void Sema::ActOnFields(Scope* S, 8014 SourceLocation RecLoc, Decl *EnclosingDecl, 8015 Decl **Fields, unsigned NumFields, 8016 SourceLocation LBrac, SourceLocation RBrac, 8017 AttributeList *Attr) { 8018 assert(EnclosingDecl && "missing record or interface decl"); 8019 8020 // If the decl this is being inserted into is invalid, then it may be a 8021 // redeclaration or some other bogus case. Don't try to add fields to it. 8022 if (EnclosingDecl->isInvalidDecl()) { 8023 // FIXME: Deallocate fields? 8024 return; 8025 } 8026 8027 8028 // Verify that all the fields are okay. 8029 unsigned NumNamedMembers = 0; 8030 llvm::SmallVector<FieldDecl*, 32> RecFields; 8031 8032 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 8033 for (unsigned i = 0; i != NumFields; ++i) { 8034 FieldDecl *FD = cast<FieldDecl>(Fields[i]); 8035 8036 // Get the type for the field. 8037 const Type *FDTy = FD->getType().getTypePtr(); 8038 8039 if (!FD->isAnonymousStructOrUnion()) { 8040 // Remember all fields written by the user. 8041 RecFields.push_back(FD); 8042 } 8043 8044 // If the field is already invalid for some reason, don't emit more 8045 // diagnostics about it. 8046 if (FD->isInvalidDecl()) { 8047 EnclosingDecl->setInvalidDecl(); 8048 continue; 8049 } 8050 8051 // C99 6.7.2.1p2: 8052 // A structure or union shall not contain a member with 8053 // incomplete or function type (hence, a structure shall not 8054 // contain an instance of itself, but may contain a pointer to 8055 // an instance of itself), except that the last member of a 8056 // structure with more than one named member may have incomplete 8057 // array type; such a structure (and any union containing, 8058 // possibly recursively, a member that is such a structure) 8059 // shall not be a member of a structure or an element of an 8060 // array. 8061 if (FDTy->isFunctionType()) { 8062 // Field declared as a function. 8063 Diag(FD->getLocation(), diag::err_field_declared_as_function) 8064 << FD->getDeclName(); 8065 FD->setInvalidDecl(); 8066 EnclosingDecl->setInvalidDecl(); 8067 continue; 8068 } else if (FDTy->isIncompleteArrayType() && Record && 8069 ((i == NumFields - 1 && !Record->isUnion()) || 8070 ((getLangOptions().Microsoft || getLangOptions().CPlusPlus) && 8071 (i == NumFields - 1 || Record->isUnion())))) { 8072 // Flexible array member. 8073 // Microsoft and g++ is more permissive regarding flexible array. 8074 // It will accept flexible array in union and also 8075 // as the sole element of a struct/class. 8076 if (getLangOptions().Microsoft) { 8077 if (Record->isUnion()) 8078 Diag(FD->getLocation(), diag::ext_flexible_array_union_ms) 8079 << FD->getDeclName(); 8080 else if (NumFields == 1) 8081 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_ms) 8082 << FD->getDeclName() << Record->getTagKind(); 8083 } else if (getLangOptions().CPlusPlus) { 8084 if (Record->isUnion()) 8085 Diag(FD->getLocation(), diag::ext_flexible_array_union_gnu) 8086 << FD->getDeclName(); 8087 else if (NumFields == 1) 8088 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_gnu) 8089 << FD->getDeclName() << Record->getTagKind(); 8090 } else if (NumNamedMembers < 1) { 8091 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 8092 << FD->getDeclName(); 8093 FD->setInvalidDecl(); 8094 EnclosingDecl->setInvalidDecl(); 8095 continue; 8096 } 8097 if (!FD->getType()->isDependentType() && 8098 !Context.getBaseElementType(FD->getType())->isPODType()) { 8099 Diag(FD->getLocation(), diag::err_flexible_array_has_nonpod_type) 8100 << FD->getDeclName() << FD->getType(); 8101 FD->setInvalidDecl(); 8102 EnclosingDecl->setInvalidDecl(); 8103 continue; 8104 } 8105 // Okay, we have a legal flexible array member at the end of the struct. 8106 if (Record) 8107 Record->setHasFlexibleArrayMember(true); 8108 } else if (!FDTy->isDependentType() && 8109 RequireCompleteType(FD->getLocation(), FD->getType(), 8110 diag::err_field_incomplete)) { 8111 // Incomplete type 8112 FD->setInvalidDecl(); 8113 EnclosingDecl->setInvalidDecl(); 8114 continue; 8115 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) { 8116 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 8117 // If this is a member of a union, then entire union becomes "flexible". 8118 if (Record && Record->isUnion()) { 8119 Record->setHasFlexibleArrayMember(true); 8120 } else { 8121 // If this is a struct/class and this is not the last element, reject 8122 // it. Note that GCC supports variable sized arrays in the middle of 8123 // structures. 8124 if (i != NumFields-1) 8125 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 8126 << FD->getDeclName() << FD->getType(); 8127 else { 8128 // We support flexible arrays at the end of structs in 8129 // other structs as an extension. 8130 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 8131 << FD->getDeclName(); 8132 if (Record) 8133 Record->setHasFlexibleArrayMember(true); 8134 } 8135 } 8136 } 8137 if (Record && FDTTy->getDecl()->hasObjectMember()) 8138 Record->setHasObjectMember(true); 8139 } else if (FDTy->isObjCObjectType()) { 8140 /// A field cannot be an Objective-c object 8141 Diag(FD->getLocation(), diag::err_statically_allocated_object); 8142 FD->setInvalidDecl(); 8143 EnclosingDecl->setInvalidDecl(); 8144 continue; 8145 } else if (getLangOptions().ObjC1 && 8146 getLangOptions().getGCMode() != LangOptions::NonGC && 8147 Record && 8148 (FD->getType()->isObjCObjectPointerType() || 8149 FD->getType().isObjCGCStrong())) 8150 Record->setHasObjectMember(true); 8151 else if (Context.getAsArrayType(FD->getType())) { 8152 QualType BaseType = Context.getBaseElementType(FD->getType()); 8153 if (Record && BaseType->isRecordType() && 8154 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()) 8155 Record->setHasObjectMember(true); 8156 } 8157 // Keep track of the number of named members. 8158 if (FD->getIdentifier()) 8159 ++NumNamedMembers; 8160 } 8161 8162 // Okay, we successfully defined 'Record'. 8163 if (Record) { 8164 bool Completed = false; 8165 if (CXXRecordDecl *CXXRecord = dyn_cast<CXXRecordDecl>(Record)) { 8166 if (!CXXRecord->isInvalidDecl()) { 8167 // Set access bits correctly on the directly-declared conversions. 8168 UnresolvedSetImpl *Convs = CXXRecord->getConversionFunctions(); 8169 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); 8170 I != E; ++I) 8171 Convs->setAccess(I, (*I)->getAccess()); 8172 8173 if (!CXXRecord->isDependentType()) { 8174 // Adjust user-defined destructor exception spec. 8175 if (getLangOptions().CPlusPlus0x && 8176 CXXRecord->hasUserDeclaredDestructor()) 8177 AdjustDestructorExceptionSpec(CXXRecord,CXXRecord->getDestructor()); 8178 8179 // Add any implicitly-declared members to this class. 8180 AddImplicitlyDeclaredMembersToClass(CXXRecord); 8181 8182 // If we have virtual base classes, we may end up finding multiple 8183 // final overriders for a given virtual function. Check for this 8184 // problem now. 8185 if (CXXRecord->getNumVBases()) { 8186 CXXFinalOverriderMap FinalOverriders; 8187 CXXRecord->getFinalOverriders(FinalOverriders); 8188 8189 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 8190 MEnd = FinalOverriders.end(); 8191 M != MEnd; ++M) { 8192 for (OverridingMethods::iterator SO = M->second.begin(), 8193 SOEnd = M->second.end(); 8194 SO != SOEnd; ++SO) { 8195 assert(SO->second.size() > 0 && 8196 "Virtual function without overridding functions?"); 8197 if (SO->second.size() == 1) 8198 continue; 8199 8200 // C++ [class.virtual]p2: 8201 // In a derived class, if a virtual member function of a base 8202 // class subobject has more than one final overrider the 8203 // program is ill-formed. 8204 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 8205 << (NamedDecl *)M->first << Record; 8206 Diag(M->first->getLocation(), 8207 diag::note_overridden_virtual_function); 8208 for (OverridingMethods::overriding_iterator 8209 OM = SO->second.begin(), 8210 OMEnd = SO->second.end(); 8211 OM != OMEnd; ++OM) 8212 Diag(OM->Method->getLocation(), diag::note_final_overrider) 8213 << (NamedDecl *)M->first << OM->Method->getParent(); 8214 8215 Record->setInvalidDecl(); 8216 } 8217 } 8218 CXXRecord->completeDefinition(&FinalOverriders); 8219 Completed = true; 8220 } 8221 } 8222 } 8223 } 8224 8225 if (!Completed) 8226 Record->completeDefinition(); 8227 8228 // Now that the record is complete, do any delayed exception spec checks 8229 // we were missing. 8230 if (!DelayedDestructorExceptionSpecChecks.empty()) { 8231 const CXXDestructorDecl *Dtor = 8232 DelayedDestructorExceptionSpecChecks.back().first; 8233 if (Dtor->getParent() == Record) { 8234 assert(!Dtor->getParent()->isDependentType() && 8235 "Should not ever add destructors of templates into the list."); 8236 CheckOverridingFunctionExceptionSpec(Dtor, 8237 DelayedDestructorExceptionSpecChecks.back().second); 8238 DelayedDestructorExceptionSpecChecks.pop_back(); 8239 } 8240 } 8241 8242 } else { 8243 ObjCIvarDecl **ClsFields = 8244 reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); 8245 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 8246 ID->setLocEnd(RBrac); 8247 // Add ivar's to class's DeclContext. 8248 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 8249 ClsFields[i]->setLexicalDeclContext(ID); 8250 ID->addDecl(ClsFields[i]); 8251 } 8252 // Must enforce the rule that ivars in the base classes may not be 8253 // duplicates. 8254 if (ID->getSuperClass()) 8255 DiagnoseDuplicateIvars(ID, ID->getSuperClass()); 8256 } else if (ObjCImplementationDecl *IMPDecl = 8257 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 8258 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 8259 for (unsigned I = 0, N = RecFields.size(); I != N; ++I) 8260 // Ivar declared in @implementation never belongs to the implementation. 8261 // Only it is in implementation's lexical context. 8262 ClsFields[I]->setLexicalDeclContext(IMPDecl); 8263 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 8264 } else if (ObjCCategoryDecl *CDecl = 8265 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 8266 // case of ivars in class extension; all other cases have been 8267 // reported as errors elsewhere. 8268 // FIXME. Class extension does not have a LocEnd field. 8269 // CDecl->setLocEnd(RBrac); 8270 // Add ivar's to class extension's DeclContext. 8271 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 8272 ClsFields[i]->setLexicalDeclContext(CDecl); 8273 CDecl->addDecl(ClsFields[i]); 8274 } 8275 } 8276 } 8277 8278 if (Attr) 8279 ProcessDeclAttributeList(S, Record, Attr); 8280 8281 // If there's a #pragma GCC visibility in scope, and this isn't a subclass, 8282 // set the visibility of this record. 8283 if (Record && !Record->getDeclContext()->isRecord()) 8284 AddPushedVisibilityAttribute(Record); 8285} 8286 8287/// \brief Determine whether the given integral value is representable within 8288/// the given type T. 8289static bool isRepresentableIntegerValue(ASTContext &Context, 8290 llvm::APSInt &Value, 8291 QualType T) { 8292 assert(T->isIntegralType(Context) && "Integral type required!"); 8293 unsigned BitWidth = Context.getIntWidth(T); 8294 8295 if (Value.isUnsigned() || Value.isNonNegative()) { 8296 if (T->isSignedIntegerOrEnumerationType()) 8297 --BitWidth; 8298 return Value.getActiveBits() <= BitWidth; 8299 } 8300 return Value.getMinSignedBits() <= BitWidth; 8301} 8302 8303// \brief Given an integral type, return the next larger integral type 8304// (or a NULL type of no such type exists). 8305static QualType getNextLargerIntegralType(ASTContext &Context, QualType T) { 8306 // FIXME: Int128/UInt128 support, which also needs to be introduced into 8307 // enum checking below. 8308 assert(T->isIntegralType(Context) && "Integral type required!"); 8309 const unsigned NumTypes = 4; 8310 QualType SignedIntegralTypes[NumTypes] = { 8311 Context.ShortTy, Context.IntTy, Context.LongTy, Context.LongLongTy 8312 }; 8313 QualType UnsignedIntegralTypes[NumTypes] = { 8314 Context.UnsignedShortTy, Context.UnsignedIntTy, Context.UnsignedLongTy, 8315 Context.UnsignedLongLongTy 8316 }; 8317 8318 unsigned BitWidth = Context.getTypeSize(T); 8319 QualType *Types = T->isSignedIntegerOrEnumerationType()? SignedIntegralTypes 8320 : UnsignedIntegralTypes; 8321 for (unsigned I = 0; I != NumTypes; ++I) 8322 if (Context.getTypeSize(Types[I]) > BitWidth) 8323 return Types[I]; 8324 8325 return QualType(); 8326} 8327 8328EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 8329 EnumConstantDecl *LastEnumConst, 8330 SourceLocation IdLoc, 8331 IdentifierInfo *Id, 8332 Expr *Val) { 8333 unsigned IntWidth = Context.Target.getIntWidth(); 8334 llvm::APSInt EnumVal(IntWidth); 8335 QualType EltTy; 8336 8337 if (Val && DiagnoseUnexpandedParameterPack(Val, UPPC_EnumeratorValue)) 8338 Val = 0; 8339 8340 if (Val) { 8341 if (Enum->isDependentType() || Val->isTypeDependent()) 8342 EltTy = Context.DependentTy; 8343 else { 8344 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 8345 SourceLocation ExpLoc; 8346 if (!Val->isValueDependent() && 8347 VerifyIntegerConstantExpression(Val, &EnumVal)) { 8348 Val = 0; 8349 } else { 8350 if (!getLangOptions().CPlusPlus) { 8351 // C99 6.7.2.2p2: 8352 // The expression that defines the value of an enumeration constant 8353 // shall be an integer constant expression that has a value 8354 // representable as an int. 8355 8356 // Complain if the value is not representable in an int. 8357 if (!isRepresentableIntegerValue(Context, EnumVal, Context.IntTy)) 8358 Diag(IdLoc, diag::ext_enum_value_not_int) 8359 << EnumVal.toString(10) << Val->getSourceRange() 8360 << (EnumVal.isUnsigned() || EnumVal.isNonNegative()); 8361 else if (!Context.hasSameType(Val->getType(), Context.IntTy)) { 8362 // Force the type of the expression to 'int'. 8363 Val = ImpCastExprToType(Val, Context.IntTy, CK_IntegralCast).take(); 8364 } 8365 } 8366 8367 if (Enum->isFixed()) { 8368 EltTy = Enum->getIntegerType(); 8369 8370 // C++0x [dcl.enum]p5: 8371 // ... if the initializing value of an enumerator cannot be 8372 // represented by the underlying type, the program is ill-formed. 8373 if (!isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 8374 if (getLangOptions().Microsoft) { 8375 Diag(IdLoc, diag::ext_enumerator_too_large) << EltTy; 8376 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 8377 } else 8378 Diag(IdLoc, diag::err_enumerator_too_large) 8379 << EltTy; 8380 } else 8381 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 8382 } 8383 else { 8384 // C++0x [dcl.enum]p5: 8385 // If the underlying type is not fixed, the type of each enumerator 8386 // is the type of its initializing value: 8387 // - If an initializer is specified for an enumerator, the 8388 // initializing value has the same type as the expression. 8389 EltTy = Val->getType(); 8390 } 8391 } 8392 } 8393 } 8394 8395 if (!Val) { 8396 if (Enum->isDependentType()) 8397 EltTy = Context.DependentTy; 8398 else if (!LastEnumConst) { 8399 // C++0x [dcl.enum]p5: 8400 // If the underlying type is not fixed, the type of each enumerator 8401 // is the type of its initializing value: 8402 // - If no initializer is specified for the first enumerator, the 8403 // initializing value has an unspecified integral type. 8404 // 8405 // GCC uses 'int' for its unspecified integral type, as does 8406 // C99 6.7.2.2p3. 8407 if (Enum->isFixed()) { 8408 EltTy = Enum->getIntegerType(); 8409 } 8410 else { 8411 EltTy = Context.IntTy; 8412 } 8413 } else { 8414 // Assign the last value + 1. 8415 EnumVal = LastEnumConst->getInitVal(); 8416 ++EnumVal; 8417 EltTy = LastEnumConst->getType(); 8418 8419 // Check for overflow on increment. 8420 if (EnumVal < LastEnumConst->getInitVal()) { 8421 // C++0x [dcl.enum]p5: 8422 // If the underlying type is not fixed, the type of each enumerator 8423 // is the type of its initializing value: 8424 // 8425 // - Otherwise the type of the initializing value is the same as 8426 // the type of the initializing value of the preceding enumerator 8427 // unless the incremented value is not representable in that type, 8428 // in which case the type is an unspecified integral type 8429 // sufficient to contain the incremented value. If no such type 8430 // exists, the program is ill-formed. 8431 QualType T = getNextLargerIntegralType(Context, EltTy); 8432 if (T.isNull() || Enum->isFixed()) { 8433 // There is no integral type larger enough to represent this 8434 // value. Complain, then allow the value to wrap around. 8435 EnumVal = LastEnumConst->getInitVal(); 8436 EnumVal = EnumVal.zext(EnumVal.getBitWidth() * 2); 8437 ++EnumVal; 8438 if (Enum->isFixed()) 8439 // When the underlying type is fixed, this is ill-formed. 8440 Diag(IdLoc, diag::err_enumerator_wrapped) 8441 << EnumVal.toString(10) 8442 << EltTy; 8443 else 8444 Diag(IdLoc, diag::warn_enumerator_too_large) 8445 << EnumVal.toString(10); 8446 } else { 8447 EltTy = T; 8448 } 8449 8450 // Retrieve the last enumerator's value, extent that type to the 8451 // type that is supposed to be large enough to represent the incremented 8452 // value, then increment. 8453 EnumVal = LastEnumConst->getInitVal(); 8454 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 8455 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 8456 ++EnumVal; 8457 8458 // If we're not in C++, diagnose the overflow of enumerator values, 8459 // which in C99 means that the enumerator value is not representable in 8460 // an int (C99 6.7.2.2p2). However, we support GCC's extension that 8461 // permits enumerator values that are representable in some larger 8462 // integral type. 8463 if (!getLangOptions().CPlusPlus && !T.isNull()) 8464 Diag(IdLoc, diag::warn_enum_value_overflow); 8465 } else if (!getLangOptions().CPlusPlus && 8466 !isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 8467 // Enforce C99 6.7.2.2p2 even when we compute the next value. 8468 Diag(IdLoc, diag::ext_enum_value_not_int) 8469 << EnumVal.toString(10) << 1; 8470 } 8471 } 8472 } 8473 8474 if (!EltTy->isDependentType()) { 8475 // Make the enumerator value match the signedness and size of the 8476 // enumerator's type. 8477 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 8478 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 8479 } 8480 8481 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 8482 Val, EnumVal); 8483} 8484 8485 8486Decl *Sema::ActOnEnumConstant(Scope *S, Decl *theEnumDecl, Decl *lastEnumConst, 8487 SourceLocation IdLoc, IdentifierInfo *Id, 8488 AttributeList *Attr, 8489 SourceLocation EqualLoc, ExprTy *val) { 8490 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl); 8491 EnumConstantDecl *LastEnumConst = 8492 cast_or_null<EnumConstantDecl>(lastEnumConst); 8493 Expr *Val = static_cast<Expr*>(val); 8494 8495 // The scope passed in may not be a decl scope. Zip up the scope tree until 8496 // we find one that is. 8497 S = getNonFieldDeclScope(S); 8498 8499 // Verify that there isn't already something declared with this name in this 8500 // scope. 8501 NamedDecl *PrevDecl = LookupSingleName(S, Id, IdLoc, LookupOrdinaryName, 8502 ForRedeclaration); 8503 if (PrevDecl && PrevDecl->isTemplateParameter()) { 8504 // Maybe we will complain about the shadowed template parameter. 8505 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 8506 // Just pretend that we didn't see the previous declaration. 8507 PrevDecl = 0; 8508 } 8509 8510 if (PrevDecl) { 8511 // When in C++, we may get a TagDecl with the same name; in this case the 8512 // enum constant will 'hide' the tag. 8513 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 8514 "Received TagDecl when not in C++!"); 8515 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 8516 if (isa<EnumConstantDecl>(PrevDecl)) 8517 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 8518 else 8519 Diag(IdLoc, diag::err_redefinition) << Id; 8520 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 8521 return 0; 8522 } 8523 } 8524 8525 // C++ [class.mem]p13: 8526 // If T is the name of a class, then each of the following shall have a 8527 // name different from T: 8528 // - every enumerator of every member of class T that is an enumerated 8529 // type 8530 if (CXXRecordDecl *Record 8531 = dyn_cast<CXXRecordDecl>( 8532 TheEnumDecl->getDeclContext()->getRedeclContext())) 8533 if (Record->getIdentifier() && Record->getIdentifier() == Id) 8534 Diag(IdLoc, diag::err_member_name_of_class) << Id; 8535 8536 EnumConstantDecl *New = 8537 CheckEnumConstant(TheEnumDecl, LastEnumConst, IdLoc, Id, Val); 8538 8539 if (New) { 8540 // Process attributes. 8541 if (Attr) ProcessDeclAttributeList(S, New, Attr); 8542 8543 // Register this decl in the current scope stack. 8544 New->setAccess(TheEnumDecl->getAccess()); 8545 PushOnScopeChains(New, S); 8546 } 8547 8548 return New; 8549} 8550 8551void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc, 8552 SourceLocation RBraceLoc, Decl *EnumDeclX, 8553 Decl **Elements, unsigned NumElements, 8554 Scope *S, AttributeList *Attr) { 8555 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX); 8556 QualType EnumType = Context.getTypeDeclType(Enum); 8557 8558 if (Attr) 8559 ProcessDeclAttributeList(S, Enum, Attr); 8560 8561 if (Enum->isDependentType()) { 8562 for (unsigned i = 0; i != NumElements; ++i) { 8563 EnumConstantDecl *ECD = 8564 cast_or_null<EnumConstantDecl>(Elements[i]); 8565 if (!ECD) continue; 8566 8567 ECD->setType(EnumType); 8568 } 8569 8570 Enum->completeDefinition(Context.DependentTy, Context.DependentTy, 0, 0); 8571 return; 8572 } 8573 8574 // TODO: If the result value doesn't fit in an int, it must be a long or long 8575 // long value. ISO C does not support this, but GCC does as an extension, 8576 // emit a warning. 8577 unsigned IntWidth = Context.Target.getIntWidth(); 8578 unsigned CharWidth = Context.Target.getCharWidth(); 8579 unsigned ShortWidth = Context.Target.getShortWidth(); 8580 8581 // Verify that all the values are okay, compute the size of the values, and 8582 // reverse the list. 8583 unsigned NumNegativeBits = 0; 8584 unsigned NumPositiveBits = 0; 8585 8586 // Keep track of whether all elements have type int. 8587 bool AllElementsInt = true; 8588 8589 for (unsigned i = 0; i != NumElements; ++i) { 8590 EnumConstantDecl *ECD = 8591 cast_or_null<EnumConstantDecl>(Elements[i]); 8592 if (!ECD) continue; // Already issued a diagnostic. 8593 8594 const llvm::APSInt &InitVal = ECD->getInitVal(); 8595 8596 // Keep track of the size of positive and negative values. 8597 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 8598 NumPositiveBits = std::max(NumPositiveBits, 8599 (unsigned)InitVal.getActiveBits()); 8600 else 8601 NumNegativeBits = std::max(NumNegativeBits, 8602 (unsigned)InitVal.getMinSignedBits()); 8603 8604 // Keep track of whether every enum element has type int (very commmon). 8605 if (AllElementsInt) 8606 AllElementsInt = ECD->getType() == Context.IntTy; 8607 } 8608 8609 // Figure out the type that should be used for this enum. 8610 QualType BestType; 8611 unsigned BestWidth; 8612 8613 // C++0x N3000 [conv.prom]p3: 8614 // An rvalue of an unscoped enumeration type whose underlying 8615 // type is not fixed can be converted to an rvalue of the first 8616 // of the following types that can represent all the values of 8617 // the enumeration: int, unsigned int, long int, unsigned long 8618 // int, long long int, or unsigned long long int. 8619 // C99 6.4.4.3p2: 8620 // An identifier declared as an enumeration constant has type int. 8621 // The C99 rule is modified by a gcc extension 8622 QualType BestPromotionType; 8623 8624 bool Packed = Enum->getAttr<PackedAttr>() ? true : false; 8625 // -fshort-enums is the equivalent to specifying the packed attribute on all 8626 // enum definitions. 8627 if (LangOpts.ShortEnums) 8628 Packed = true; 8629 8630 if (Enum->isFixed()) { 8631 BestType = BestPromotionType = Enum->getIntegerType(); 8632 // We don't need to set BestWidth, because BestType is going to be the type 8633 // of the enumerators, but we do anyway because otherwise some compilers 8634 // warn that it might be used uninitialized. 8635 BestWidth = CharWidth; 8636 } 8637 else if (NumNegativeBits) { 8638 // If there is a negative value, figure out the smallest integer type (of 8639 // int/long/longlong) that fits. 8640 // If it's packed, check also if it fits a char or a short. 8641 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) { 8642 BestType = Context.SignedCharTy; 8643 BestWidth = CharWidth; 8644 } else if (Packed && NumNegativeBits <= ShortWidth && 8645 NumPositiveBits < ShortWidth) { 8646 BestType = Context.ShortTy; 8647 BestWidth = ShortWidth; 8648 } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 8649 BestType = Context.IntTy; 8650 BestWidth = IntWidth; 8651 } else { 8652 BestWidth = Context.Target.getLongWidth(); 8653 8654 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) { 8655 BestType = Context.LongTy; 8656 } else { 8657 BestWidth = Context.Target.getLongLongWidth(); 8658 8659 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 8660 Diag(Enum->getLocation(), diag::warn_enum_too_large); 8661 BestType = Context.LongLongTy; 8662 } 8663 } 8664 BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType); 8665 } else { 8666 // If there is no negative value, figure out the smallest type that fits 8667 // all of the enumerator values. 8668 // If it's packed, check also if it fits a char or a short. 8669 if (Packed && NumPositiveBits <= CharWidth) { 8670 BestType = Context.UnsignedCharTy; 8671 BestPromotionType = Context.IntTy; 8672 BestWidth = CharWidth; 8673 } else if (Packed && NumPositiveBits <= ShortWidth) { 8674 BestType = Context.UnsignedShortTy; 8675 BestPromotionType = Context.IntTy; 8676 BestWidth = ShortWidth; 8677 } else if (NumPositiveBits <= IntWidth) { 8678 BestType = Context.UnsignedIntTy; 8679 BestWidth = IntWidth; 8680 BestPromotionType 8681 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 8682 ? Context.UnsignedIntTy : Context.IntTy; 8683 } else if (NumPositiveBits <= 8684 (BestWidth = Context.Target.getLongWidth())) { 8685 BestType = Context.UnsignedLongTy; 8686 BestPromotionType 8687 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 8688 ? Context.UnsignedLongTy : Context.LongTy; 8689 } else { 8690 BestWidth = Context.Target.getLongLongWidth(); 8691 assert(NumPositiveBits <= BestWidth && 8692 "How could an initializer get larger than ULL?"); 8693 BestType = Context.UnsignedLongLongTy; 8694 BestPromotionType 8695 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 8696 ? Context.UnsignedLongLongTy : Context.LongLongTy; 8697 } 8698 } 8699 8700 // Loop over all of the enumerator constants, changing their types to match 8701 // the type of the enum if needed. 8702 for (unsigned i = 0; i != NumElements; ++i) { 8703 EnumConstantDecl *ECD = cast_or_null<EnumConstantDecl>(Elements[i]); 8704 if (!ECD) continue; // Already issued a diagnostic. 8705 8706 // Standard C says the enumerators have int type, but we allow, as an 8707 // extension, the enumerators to be larger than int size. If each 8708 // enumerator value fits in an int, type it as an int, otherwise type it the 8709 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 8710 // that X has type 'int', not 'unsigned'. 8711 8712 // Determine whether the value fits into an int. 8713 llvm::APSInt InitVal = ECD->getInitVal(); 8714 8715 // If it fits into an integer type, force it. Otherwise force it to match 8716 // the enum decl type. 8717 QualType NewTy; 8718 unsigned NewWidth; 8719 bool NewSign; 8720 if (!getLangOptions().CPlusPlus && 8721 isRepresentableIntegerValue(Context, InitVal, Context.IntTy)) { 8722 NewTy = Context.IntTy; 8723 NewWidth = IntWidth; 8724 NewSign = true; 8725 } else if (ECD->getType() == BestType) { 8726 // Already the right type! 8727 if (getLangOptions().CPlusPlus) 8728 // C++ [dcl.enum]p4: Following the closing brace of an 8729 // enum-specifier, each enumerator has the type of its 8730 // enumeration. 8731 ECD->setType(EnumType); 8732 continue; 8733 } else { 8734 NewTy = BestType; 8735 NewWidth = BestWidth; 8736 NewSign = BestType->isSignedIntegerOrEnumerationType(); 8737 } 8738 8739 // Adjust the APSInt value. 8740 InitVal = InitVal.extOrTrunc(NewWidth); 8741 InitVal.setIsSigned(NewSign); 8742 ECD->setInitVal(InitVal); 8743 8744 // Adjust the Expr initializer and type. 8745 if (ECD->getInitExpr() && 8746 !Context.hasSameType(NewTy, ECD->getInitExpr()->getType())) 8747 ECD->setInitExpr(ImplicitCastExpr::Create(Context, NewTy, 8748 CK_IntegralCast, 8749 ECD->getInitExpr(), 8750 /*base paths*/ 0, 8751 VK_RValue)); 8752 if (getLangOptions().CPlusPlus) 8753 // C++ [dcl.enum]p4: Following the closing brace of an 8754 // enum-specifier, each enumerator has the type of its 8755 // enumeration. 8756 ECD->setType(EnumType); 8757 else 8758 ECD->setType(NewTy); 8759 } 8760 8761 Enum->completeDefinition(BestType, BestPromotionType, 8762 NumPositiveBits, NumNegativeBits); 8763} 8764 8765Decl *Sema::ActOnFileScopeAsmDecl(Expr *expr, 8766 SourceLocation StartLoc, 8767 SourceLocation EndLoc) { 8768 StringLiteral *AsmString = cast<StringLiteral>(expr); 8769 8770 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext, 8771 AsmString, StartLoc, 8772 EndLoc); 8773 CurContext->addDecl(New); 8774 return New; 8775} 8776 8777void Sema::ActOnPragmaWeakID(IdentifierInfo* Name, 8778 SourceLocation PragmaLoc, 8779 SourceLocation NameLoc) { 8780 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, LookupOrdinaryName); 8781 8782 if (PrevDecl) { 8783 PrevDecl->addAttr(::new (Context) WeakAttr(PragmaLoc, Context)); 8784 } else { 8785 (void)WeakUndeclaredIdentifiers.insert( 8786 std::pair<IdentifierInfo*,WeakInfo> 8787 (Name, WeakInfo((IdentifierInfo*)0, NameLoc))); 8788 } 8789} 8790 8791void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name, 8792 IdentifierInfo* AliasName, 8793 SourceLocation PragmaLoc, 8794 SourceLocation NameLoc, 8795 SourceLocation AliasNameLoc) { 8796 Decl *PrevDecl = LookupSingleName(TUScope, AliasName, AliasNameLoc, 8797 LookupOrdinaryName); 8798 WeakInfo W = WeakInfo(Name, NameLoc); 8799 8800 if (PrevDecl) { 8801 if (!PrevDecl->hasAttr<AliasAttr>()) 8802 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl)) 8803 DeclApplyPragmaWeak(TUScope, ND, W); 8804 } else { 8805 (void)WeakUndeclaredIdentifiers.insert( 8806 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W)); 8807 } 8808} 8809