SemaDecl.cpp revision e1e96a6201168c232a06ec81685f948e05fddd39
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->isCopyConstructor()) 1509 return Sema::CXXCopyConstructor; 1510 1511 if (Ctor->isDefaultConstructor()) 1512 return Sema::CXXDefaultConstructor; 1513 } 1514 1515 if (isa<CXXDestructorDecl>(MD)) 1516 return Sema::CXXDestructor; 1517 1518 if (MD->isCopyAssignmentOperator()) 1519 return Sema::CXXCopyAssignment; 1520 1521 return Sema::CXXInvalid; 1522} 1523 1524/// canRedefineFunction - checks if a function can be redefined. Currently, 1525/// only extern inline functions can be redefined, and even then only in 1526/// GNU89 mode. 1527static bool canRedefineFunction(const FunctionDecl *FD, 1528 const LangOptions& LangOpts) { 1529 return (LangOpts.GNUMode && !LangOpts.C99 && !LangOpts.CPlusPlus && 1530 FD->isInlineSpecified() && 1531 FD->getStorageClass() == SC_Extern); 1532} 1533 1534/// MergeFunctionDecl - We just parsed a function 'New' from 1535/// declarator D which has the same name and scope as a previous 1536/// declaration 'Old'. Figure out how to resolve this situation, 1537/// merging decls or emitting diagnostics as appropriate. 1538/// 1539/// In C++, New and Old must be declarations that are not 1540/// overloaded. Use IsOverload to determine whether New and Old are 1541/// overloaded, and to select the Old declaration that New should be 1542/// merged with. 1543/// 1544/// Returns true if there was an error, false otherwise. 1545bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD) { 1546 // Verify the old decl was also a function. 1547 FunctionDecl *Old = 0; 1548 if (FunctionTemplateDecl *OldFunctionTemplate 1549 = dyn_cast<FunctionTemplateDecl>(OldD)) 1550 Old = OldFunctionTemplate->getTemplatedDecl(); 1551 else 1552 Old = dyn_cast<FunctionDecl>(OldD); 1553 if (!Old) { 1554 if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(OldD)) { 1555 Diag(New->getLocation(), diag::err_using_decl_conflict_reverse); 1556 Diag(Shadow->getTargetDecl()->getLocation(), 1557 diag::note_using_decl_target); 1558 Diag(Shadow->getUsingDecl()->getLocation(), 1559 diag::note_using_decl) << 0; 1560 return true; 1561 } 1562 1563 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1564 << New->getDeclName(); 1565 Diag(OldD->getLocation(), diag::note_previous_definition); 1566 return true; 1567 } 1568 1569 // Determine whether the previous declaration was a definition, 1570 // implicit declaration, or a declaration. 1571 diag::kind PrevDiag; 1572 if (Old->isThisDeclarationADefinition()) 1573 PrevDiag = diag::note_previous_definition; 1574 else if (Old->isImplicit()) 1575 PrevDiag = diag::note_previous_implicit_declaration; 1576 else 1577 PrevDiag = diag::note_previous_declaration; 1578 1579 QualType OldQType = Context.getCanonicalType(Old->getType()); 1580 QualType NewQType = Context.getCanonicalType(New->getType()); 1581 1582 // Don't complain about this if we're in GNU89 mode and the old function 1583 // is an extern inline function. 1584 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) && 1585 New->getStorageClass() == SC_Static && 1586 Old->getStorageClass() != SC_Static && 1587 !canRedefineFunction(Old, getLangOptions())) { 1588 if (getLangOptions().Microsoft) { 1589 Diag(New->getLocation(), diag::warn_static_non_static) << New; 1590 Diag(Old->getLocation(), PrevDiag); 1591 } else { 1592 Diag(New->getLocation(), diag::err_static_non_static) << New; 1593 Diag(Old->getLocation(), PrevDiag); 1594 return true; 1595 } 1596 } 1597 1598 // If a function is first declared with a calling convention, but is 1599 // later declared or defined without one, the second decl assumes the 1600 // calling convention of the first. 1601 // 1602 // For the new decl, we have to look at the NON-canonical type to tell the 1603 // difference between a function that really doesn't have a calling 1604 // convention and one that is declared cdecl. That's because in 1605 // canonicalization (see ASTContext.cpp), cdecl is canonicalized away 1606 // because it is the default calling convention. 1607 // 1608 // Note also that we DO NOT return at this point, because we still have 1609 // other tests to run. 1610 const FunctionType *OldType = cast<FunctionType>(OldQType); 1611 const FunctionType *NewType = New->getType()->getAs<FunctionType>(); 1612 FunctionType::ExtInfo OldTypeInfo = OldType->getExtInfo(); 1613 FunctionType::ExtInfo NewTypeInfo = NewType->getExtInfo(); 1614 bool RequiresAdjustment = false; 1615 if (OldTypeInfo.getCC() != CC_Default && 1616 NewTypeInfo.getCC() == CC_Default) { 1617 NewTypeInfo = NewTypeInfo.withCallingConv(OldTypeInfo.getCC()); 1618 RequiresAdjustment = true; 1619 } else if (!Context.isSameCallConv(OldTypeInfo.getCC(), 1620 NewTypeInfo.getCC())) { 1621 // Calling conventions really aren't compatible, so complain. 1622 Diag(New->getLocation(), diag::err_cconv_change) 1623 << FunctionType::getNameForCallConv(NewTypeInfo.getCC()) 1624 << (OldTypeInfo.getCC() == CC_Default) 1625 << (OldTypeInfo.getCC() == CC_Default ? "" : 1626 FunctionType::getNameForCallConv(OldTypeInfo.getCC())); 1627 Diag(Old->getLocation(), diag::note_previous_declaration); 1628 return true; 1629 } 1630 1631 // FIXME: diagnose the other way around? 1632 if (OldTypeInfo.getNoReturn() && !NewTypeInfo.getNoReturn()) { 1633 NewTypeInfo = NewTypeInfo.withNoReturn(true); 1634 RequiresAdjustment = true; 1635 } 1636 1637 // Merge regparm attribute. 1638 if (OldTypeInfo.getHasRegParm() != NewTypeInfo.getHasRegParm() || 1639 OldTypeInfo.getRegParm() != NewTypeInfo.getRegParm()) { 1640 if (NewTypeInfo.getHasRegParm()) { 1641 Diag(New->getLocation(), diag::err_regparm_mismatch) 1642 << NewType->getRegParmType() 1643 << OldType->getRegParmType(); 1644 Diag(Old->getLocation(), diag::note_previous_declaration); 1645 return true; 1646 } 1647 1648 NewTypeInfo = NewTypeInfo.withRegParm(OldTypeInfo.getRegParm()); 1649 RequiresAdjustment = true; 1650 } 1651 1652 if (RequiresAdjustment) { 1653 NewType = Context.adjustFunctionType(NewType, NewTypeInfo); 1654 New->setType(QualType(NewType, 0)); 1655 NewQType = Context.getCanonicalType(New->getType()); 1656 } 1657 1658 if (getLangOptions().CPlusPlus) { 1659 // (C++98 13.1p2): 1660 // Certain function declarations cannot be overloaded: 1661 // -- Function declarations that differ only in the return type 1662 // cannot be overloaded. 1663 QualType OldReturnType = OldType->getResultType(); 1664 QualType NewReturnType = cast<FunctionType>(NewQType)->getResultType(); 1665 QualType ResQT; 1666 if (OldReturnType != NewReturnType) { 1667 if (NewReturnType->isObjCObjectPointerType() 1668 && OldReturnType->isObjCObjectPointerType()) 1669 ResQT = Context.mergeObjCGCQualifiers(NewQType, OldQType); 1670 if (ResQT.isNull()) { 1671 if (New->isCXXClassMember() && New->isOutOfLine()) 1672 Diag(New->getLocation(), 1673 diag::err_member_def_does_not_match_ret_type) << New; 1674 else 1675 Diag(New->getLocation(), diag::err_ovl_diff_return_type); 1676 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1677 return true; 1678 } 1679 else 1680 NewQType = ResQT; 1681 } 1682 1683 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 1684 CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 1685 if (OldMethod && NewMethod) { 1686 // Preserve triviality. 1687 NewMethod->setTrivial(OldMethod->isTrivial()); 1688 1689 bool isFriend = NewMethod->getFriendObjectKind(); 1690 1691 if (!isFriend && NewMethod->getLexicalDeclContext()->isRecord()) { 1692 // -- Member function declarations with the same name and the 1693 // same parameter types cannot be overloaded if any of them 1694 // is a static member function declaration. 1695 if (OldMethod->isStatic() || NewMethod->isStatic()) { 1696 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 1697 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1698 return true; 1699 } 1700 1701 // C++ [class.mem]p1: 1702 // [...] A member shall not be declared twice in the 1703 // member-specification, except that a nested class or member 1704 // class template can be declared and then later defined. 1705 unsigned NewDiag; 1706 if (isa<CXXConstructorDecl>(OldMethod)) 1707 NewDiag = diag::err_constructor_redeclared; 1708 else if (isa<CXXDestructorDecl>(NewMethod)) 1709 NewDiag = diag::err_destructor_redeclared; 1710 else if (isa<CXXConversionDecl>(NewMethod)) 1711 NewDiag = diag::err_conv_function_redeclared; 1712 else 1713 NewDiag = diag::err_member_redeclared; 1714 1715 Diag(New->getLocation(), NewDiag); 1716 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1717 1718 // Complain if this is an explicit declaration of a special 1719 // member that was initially declared implicitly. 1720 // 1721 // As an exception, it's okay to befriend such methods in order 1722 // to permit the implicit constructor/destructor/operator calls. 1723 } else if (OldMethod->isImplicit()) { 1724 if (isFriend) { 1725 NewMethod->setImplicit(); 1726 } else { 1727 Diag(NewMethod->getLocation(), 1728 diag::err_definition_of_implicitly_declared_member) 1729 << New << getSpecialMember(OldMethod); 1730 return true; 1731 } 1732 } else if (OldMethod->isExplicitlyDefaulted()) { 1733 Diag(NewMethod->getLocation(), 1734 diag::err_definition_of_explicitly_defaulted_member) 1735 << getSpecialMember(OldMethod); 1736 return true; 1737 } 1738 } 1739 1740 // (C++98 8.3.5p3): 1741 // All declarations for a function shall agree exactly in both the 1742 // return type and the parameter-type-list. 1743 // We also want to respect all the extended bits except noreturn. 1744 1745 // noreturn should now match unless the old type info didn't have it. 1746 QualType OldQTypeForComparison = OldQType; 1747 if (!OldTypeInfo.getNoReturn() && NewTypeInfo.getNoReturn()) { 1748 assert(OldQType == QualType(OldType, 0)); 1749 const FunctionType *OldTypeForComparison 1750 = Context.adjustFunctionType(OldType, OldTypeInfo.withNoReturn(true)); 1751 OldQTypeForComparison = QualType(OldTypeForComparison, 0); 1752 assert(OldQTypeForComparison.isCanonical()); 1753 } 1754 1755 if (OldQTypeForComparison == NewQType) 1756 return MergeCompatibleFunctionDecls(New, Old); 1757 1758 // Fall through for conflicting redeclarations and redefinitions. 1759 } 1760 1761 // C: Function types need to be compatible, not identical. This handles 1762 // duplicate function decls like "void f(int); void f(enum X);" properly. 1763 if (!getLangOptions().CPlusPlus && 1764 Context.typesAreCompatible(OldQType, NewQType)) { 1765 const FunctionType *OldFuncType = OldQType->getAs<FunctionType>(); 1766 const FunctionType *NewFuncType = NewQType->getAs<FunctionType>(); 1767 const FunctionProtoType *OldProto = 0; 1768 if (isa<FunctionNoProtoType>(NewFuncType) && 1769 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) { 1770 // The old declaration provided a function prototype, but the 1771 // new declaration does not. Merge in the prototype. 1772 assert(!OldProto->hasExceptionSpec() && "Exception spec in C"); 1773 llvm::SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(), 1774 OldProto->arg_type_end()); 1775 NewQType = Context.getFunctionType(NewFuncType->getResultType(), 1776 ParamTypes.data(), ParamTypes.size(), 1777 OldProto->getExtProtoInfo()); 1778 New->setType(NewQType); 1779 New->setHasInheritedPrototype(); 1780 1781 // Synthesize a parameter for each argument type. 1782 llvm::SmallVector<ParmVarDecl*, 16> Params; 1783 for (FunctionProtoType::arg_type_iterator 1784 ParamType = OldProto->arg_type_begin(), 1785 ParamEnd = OldProto->arg_type_end(); 1786 ParamType != ParamEnd; ++ParamType) { 1787 ParmVarDecl *Param = ParmVarDecl::Create(Context, New, 1788 SourceLocation(), 1789 SourceLocation(), 0, 1790 *ParamType, /*TInfo=*/0, 1791 SC_None, SC_None, 1792 0); 1793 Param->setScopeInfo(0, Params.size()); 1794 Param->setImplicit(); 1795 Params.push_back(Param); 1796 } 1797 1798 New->setParams(Params.data(), Params.size()); 1799 } 1800 1801 return MergeCompatibleFunctionDecls(New, Old); 1802 } 1803 1804 // GNU C permits a K&R definition to follow a prototype declaration 1805 // if the declared types of the parameters in the K&R definition 1806 // match the types in the prototype declaration, even when the 1807 // promoted types of the parameters from the K&R definition differ 1808 // from the types in the prototype. GCC then keeps the types from 1809 // the prototype. 1810 // 1811 // If a variadic prototype is followed by a non-variadic K&R definition, 1812 // the K&R definition becomes variadic. This is sort of an edge case, but 1813 // it's legal per the standard depending on how you read C99 6.7.5.3p15 and 1814 // C99 6.9.1p8. 1815 if (!getLangOptions().CPlusPlus && 1816 Old->hasPrototype() && !New->hasPrototype() && 1817 New->getType()->getAs<FunctionProtoType>() && 1818 Old->getNumParams() == New->getNumParams()) { 1819 llvm::SmallVector<QualType, 16> ArgTypes; 1820 llvm::SmallVector<GNUCompatibleParamWarning, 16> Warnings; 1821 const FunctionProtoType *OldProto 1822 = Old->getType()->getAs<FunctionProtoType>(); 1823 const FunctionProtoType *NewProto 1824 = New->getType()->getAs<FunctionProtoType>(); 1825 1826 // Determine whether this is the GNU C extension. 1827 QualType MergedReturn = Context.mergeTypes(OldProto->getResultType(), 1828 NewProto->getResultType()); 1829 bool LooseCompatible = !MergedReturn.isNull(); 1830 for (unsigned Idx = 0, End = Old->getNumParams(); 1831 LooseCompatible && Idx != End; ++Idx) { 1832 ParmVarDecl *OldParm = Old->getParamDecl(Idx); 1833 ParmVarDecl *NewParm = New->getParamDecl(Idx); 1834 if (Context.typesAreCompatible(OldParm->getType(), 1835 NewProto->getArgType(Idx))) { 1836 ArgTypes.push_back(NewParm->getType()); 1837 } else if (Context.typesAreCompatible(OldParm->getType(), 1838 NewParm->getType(), 1839 /*CompareUnqualified=*/true)) { 1840 GNUCompatibleParamWarning Warn 1841 = { OldParm, NewParm, NewProto->getArgType(Idx) }; 1842 Warnings.push_back(Warn); 1843 ArgTypes.push_back(NewParm->getType()); 1844 } else 1845 LooseCompatible = false; 1846 } 1847 1848 if (LooseCompatible) { 1849 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) { 1850 Diag(Warnings[Warn].NewParm->getLocation(), 1851 diag::ext_param_promoted_not_compatible_with_prototype) 1852 << Warnings[Warn].PromotedType 1853 << Warnings[Warn].OldParm->getType(); 1854 if (Warnings[Warn].OldParm->getLocation().isValid()) 1855 Diag(Warnings[Warn].OldParm->getLocation(), 1856 diag::note_previous_declaration); 1857 } 1858 1859 New->setType(Context.getFunctionType(MergedReturn, &ArgTypes[0], 1860 ArgTypes.size(), 1861 OldProto->getExtProtoInfo())); 1862 return MergeCompatibleFunctionDecls(New, Old); 1863 } 1864 1865 // Fall through to diagnose conflicting types. 1866 } 1867 1868 // A function that has already been declared has been redeclared or defined 1869 // with a different type- show appropriate diagnostic 1870 if (unsigned BuiltinID = Old->getBuiltinID()) { 1871 // The user has declared a builtin function with an incompatible 1872 // signature. 1873 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 1874 // The function the user is redeclaring is a library-defined 1875 // function like 'malloc' or 'printf'. Warn about the 1876 // redeclaration, then pretend that we don't know about this 1877 // library built-in. 1878 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; 1879 Diag(Old->getLocation(), diag::note_previous_builtin_declaration) 1880 << Old << Old->getType(); 1881 New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin); 1882 Old->setInvalidDecl(); 1883 return false; 1884 } 1885 1886 PrevDiag = diag::note_previous_builtin_declaration; 1887 } 1888 1889 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 1890 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1891 return true; 1892} 1893 1894/// \brief Completes the merge of two function declarations that are 1895/// known to be compatible. 1896/// 1897/// This routine handles the merging of attributes and other 1898/// properties of function declarations form the old declaration to 1899/// the new declaration, once we know that New is in fact a 1900/// redeclaration of Old. 1901/// 1902/// \returns false 1903bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old) { 1904 // Merge the attributes 1905 mergeDeclAttributes(New, Old, Context); 1906 1907 // Merge the storage class. 1908 if (Old->getStorageClass() != SC_Extern && 1909 Old->getStorageClass() != SC_None) 1910 New->setStorageClass(Old->getStorageClass()); 1911 1912 // Merge "pure" flag. 1913 if (Old->isPure()) 1914 New->setPure(); 1915 1916 // Merge attributes from the parameters. These can mismatch with K&R 1917 // declarations. 1918 if (New->getNumParams() == Old->getNumParams()) 1919 for (unsigned i = 0, e = New->getNumParams(); i != e; ++i) 1920 mergeParamDeclAttributes(New->getParamDecl(i), Old->getParamDecl(i), 1921 Context); 1922 1923 if (getLangOptions().CPlusPlus) 1924 return MergeCXXFunctionDecl(New, Old); 1925 1926 return false; 1927} 1928 1929void Sema::mergeObjCMethodDecls(ObjCMethodDecl *newMethod, 1930 const ObjCMethodDecl *oldMethod) { 1931 // Merge the attributes. 1932 mergeDeclAttributes(newMethod, oldMethod, Context); 1933 1934 // Merge attributes from the parameters. 1935 for (ObjCMethodDecl::param_iterator oi = oldMethod->param_begin(), 1936 ni = newMethod->param_begin(), ne = newMethod->param_end(); 1937 ni != ne; ++ni, ++oi) 1938 mergeParamDeclAttributes(*ni, *oi, Context); 1939} 1940 1941/// MergeVarDeclTypes - We parsed a variable 'New' which has the same name and 1942/// scope as a previous declaration 'Old'. Figure out how to merge their types, 1943/// emitting diagnostics as appropriate. 1944/// 1945/// Declarations using the auto type specifier (C++ [decl.spec.auto]) call back 1946/// to here in AddInitializerToDecl and AddCXXDirectInitializerToDecl. We can't 1947/// check them before the initializer is attached. 1948/// 1949void Sema::MergeVarDeclTypes(VarDecl *New, VarDecl *Old) { 1950 if (New->isInvalidDecl() || Old->isInvalidDecl()) 1951 return; 1952 1953 QualType MergedT; 1954 if (getLangOptions().CPlusPlus) { 1955 AutoType *AT = New->getType()->getContainedAutoType(); 1956 if (AT && !AT->isDeduced()) { 1957 // We don't know what the new type is until the initializer is attached. 1958 return; 1959 } else if (Context.hasSameType(New->getType(), Old->getType())) { 1960 // These could still be something that needs exception specs checked. 1961 return MergeVarDeclExceptionSpecs(New, Old); 1962 } 1963 // C++ [basic.link]p10: 1964 // [...] the types specified by all declarations referring to a given 1965 // object or function shall be identical, except that declarations for an 1966 // array object can specify array types that differ by the presence or 1967 // absence of a major array bound (8.3.4). 1968 else if (Old->getType()->isIncompleteArrayType() && 1969 New->getType()->isArrayType()) { 1970 CanQual<ArrayType> OldArray 1971 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 1972 CanQual<ArrayType> NewArray 1973 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 1974 if (OldArray->getElementType() == NewArray->getElementType()) 1975 MergedT = New->getType(); 1976 } else if (Old->getType()->isArrayType() && 1977 New->getType()->isIncompleteArrayType()) { 1978 CanQual<ArrayType> OldArray 1979 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 1980 CanQual<ArrayType> NewArray 1981 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 1982 if (OldArray->getElementType() == NewArray->getElementType()) 1983 MergedT = Old->getType(); 1984 } else if (New->getType()->isObjCObjectPointerType() 1985 && Old->getType()->isObjCObjectPointerType()) { 1986 MergedT = Context.mergeObjCGCQualifiers(New->getType(), 1987 Old->getType()); 1988 } 1989 } else { 1990 MergedT = Context.mergeTypes(New->getType(), Old->getType()); 1991 } 1992 if (MergedT.isNull()) { 1993 Diag(New->getLocation(), diag::err_redefinition_different_type) 1994 << New->getDeclName(); 1995 Diag(Old->getLocation(), diag::note_previous_definition); 1996 return New->setInvalidDecl(); 1997 } 1998 New->setType(MergedT); 1999} 2000 2001/// MergeVarDecl - We just parsed a variable 'New' which has the same name 2002/// and scope as a previous declaration 'Old'. Figure out how to resolve this 2003/// situation, merging decls or emitting diagnostics as appropriate. 2004/// 2005/// Tentative definition rules (C99 6.9.2p2) are checked by 2006/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 2007/// definitions here, since the initializer hasn't been attached. 2008/// 2009void Sema::MergeVarDecl(VarDecl *New, LookupResult &Previous) { 2010 // If the new decl is already invalid, don't do any other checking. 2011 if (New->isInvalidDecl()) 2012 return; 2013 2014 // Verify the old decl was also a variable. 2015 VarDecl *Old = 0; 2016 if (!Previous.isSingleResult() || 2017 !(Old = dyn_cast<VarDecl>(Previous.getFoundDecl()))) { 2018 Diag(New->getLocation(), diag::err_redefinition_different_kind) 2019 << New->getDeclName(); 2020 Diag(Previous.getRepresentativeDecl()->getLocation(), 2021 diag::note_previous_definition); 2022 return New->setInvalidDecl(); 2023 } 2024 2025 // C++ [class.mem]p1: 2026 // A member shall not be declared twice in the member-specification [...] 2027 // 2028 // Here, we need only consider static data members. 2029 if (Old->isStaticDataMember() && !New->isOutOfLine()) { 2030 Diag(New->getLocation(), diag::err_duplicate_member) 2031 << New->getIdentifier(); 2032 Diag(Old->getLocation(), diag::note_previous_declaration); 2033 New->setInvalidDecl(); 2034 } 2035 2036 mergeDeclAttributes(New, Old, Context); 2037 2038 // Merge the types. 2039 MergeVarDeclTypes(New, Old); 2040 if (New->isInvalidDecl()) 2041 return; 2042 2043 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 2044 if (New->getStorageClass() == SC_Static && 2045 (Old->getStorageClass() == SC_None || Old->hasExternalStorage())) { 2046 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 2047 Diag(Old->getLocation(), diag::note_previous_definition); 2048 return New->setInvalidDecl(); 2049 } 2050 // C99 6.2.2p4: 2051 // For an identifier declared with the storage-class specifier 2052 // extern in a scope in which a prior declaration of that 2053 // identifier is visible,23) if the prior declaration specifies 2054 // internal or external linkage, the linkage of the identifier at 2055 // the later declaration is the same as the linkage specified at 2056 // the prior declaration. If no prior declaration is visible, or 2057 // if the prior declaration specifies no linkage, then the 2058 // identifier has external linkage. 2059 if (New->hasExternalStorage() && Old->hasLinkage()) 2060 /* Okay */; 2061 else if (New->getStorageClass() != SC_Static && 2062 Old->getStorageClass() == SC_Static) { 2063 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 2064 Diag(Old->getLocation(), diag::note_previous_definition); 2065 return New->setInvalidDecl(); 2066 } 2067 2068 // Check if extern is followed by non-extern and vice-versa. 2069 if (New->hasExternalStorage() && 2070 !Old->hasLinkage() && Old->isLocalVarDecl()) { 2071 Diag(New->getLocation(), diag::err_extern_non_extern) << New->getDeclName(); 2072 Diag(Old->getLocation(), diag::note_previous_definition); 2073 return New->setInvalidDecl(); 2074 } 2075 if (Old->hasExternalStorage() && 2076 !New->hasLinkage() && New->isLocalVarDecl()) { 2077 Diag(New->getLocation(), diag::err_non_extern_extern) << New->getDeclName(); 2078 Diag(Old->getLocation(), diag::note_previous_definition); 2079 return New->setInvalidDecl(); 2080 } 2081 2082 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 2083 2084 // FIXME: The test for external storage here seems wrong? We still 2085 // need to check for mismatches. 2086 if (!New->hasExternalStorage() && !New->isFileVarDecl() && 2087 // Don't complain about out-of-line definitions of static members. 2088 !(Old->getLexicalDeclContext()->isRecord() && 2089 !New->getLexicalDeclContext()->isRecord())) { 2090 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 2091 Diag(Old->getLocation(), diag::note_previous_definition); 2092 return New->setInvalidDecl(); 2093 } 2094 2095 if (New->isThreadSpecified() && !Old->isThreadSpecified()) { 2096 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName(); 2097 Diag(Old->getLocation(), diag::note_previous_definition); 2098 } else if (!New->isThreadSpecified() && Old->isThreadSpecified()) { 2099 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName(); 2100 Diag(Old->getLocation(), diag::note_previous_definition); 2101 } 2102 2103 // C++ doesn't have tentative definitions, so go right ahead and check here. 2104 const VarDecl *Def; 2105 if (getLangOptions().CPlusPlus && 2106 New->isThisDeclarationADefinition() == VarDecl::Definition && 2107 (Def = Old->getDefinition())) { 2108 Diag(New->getLocation(), diag::err_redefinition) 2109 << New->getDeclName(); 2110 Diag(Def->getLocation(), diag::note_previous_definition); 2111 New->setInvalidDecl(); 2112 return; 2113 } 2114 // c99 6.2.2 P4. 2115 // For an identifier declared with the storage-class specifier extern in a 2116 // scope in which a prior declaration of that identifier is visible, if 2117 // the prior declaration specifies internal or external linkage, the linkage 2118 // of the identifier at the later declaration is the same as the linkage 2119 // specified at the prior declaration. 2120 // FIXME. revisit this code. 2121 if (New->hasExternalStorage() && 2122 Old->getLinkage() == InternalLinkage && 2123 New->getDeclContext() == Old->getDeclContext()) 2124 New->setStorageClass(Old->getStorageClass()); 2125 2126 // Keep a chain of previous declarations. 2127 New->setPreviousDeclaration(Old); 2128 2129 // Inherit access appropriately. 2130 New->setAccess(Old->getAccess()); 2131} 2132 2133/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2134/// no declarator (e.g. "struct foo;") is parsed. 2135Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2136 DeclSpec &DS) { 2137 return ParsedFreeStandingDeclSpec(S, AS, DS, 2138 MultiTemplateParamsArg(*this, 0, 0)); 2139} 2140 2141/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2142/// no declarator (e.g. "struct foo;") is parsed. It also accopts template 2143/// parameters to cope with template friend declarations. 2144Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2145 DeclSpec &DS, 2146 MultiTemplateParamsArg TemplateParams) { 2147 Decl *TagD = 0; 2148 TagDecl *Tag = 0; 2149 if (DS.getTypeSpecType() == DeclSpec::TST_class || 2150 DS.getTypeSpecType() == DeclSpec::TST_struct || 2151 DS.getTypeSpecType() == DeclSpec::TST_union || 2152 DS.getTypeSpecType() == DeclSpec::TST_enum) { 2153 TagD = DS.getRepAsDecl(); 2154 2155 if (!TagD) // We probably had an error 2156 return 0; 2157 2158 // Note that the above type specs guarantee that the 2159 // type rep is a Decl, whereas in many of the others 2160 // it's a Type. 2161 Tag = dyn_cast<TagDecl>(TagD); 2162 } 2163 2164 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 2165 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 2166 // or incomplete types shall not be restrict-qualified." 2167 if (TypeQuals & DeclSpec::TQ_restrict) 2168 Diag(DS.getRestrictSpecLoc(), 2169 diag::err_typecheck_invalid_restrict_not_pointer_noarg) 2170 << DS.getSourceRange(); 2171 } 2172 2173 if (DS.isFriendSpecified()) { 2174 // If we're dealing with a decl but not a TagDecl, assume that 2175 // whatever routines created it handled the friendship aspect. 2176 if (TagD && !Tag) 2177 return 0; 2178 return ActOnFriendTypeDecl(S, DS, TemplateParams); 2179 } 2180 2181 // Track whether we warned about the fact that there aren't any 2182 // declarators. 2183 bool emittedWarning = false; 2184 2185 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 2186 ProcessDeclAttributeList(S, Record, DS.getAttributes().getList()); 2187 2188 if (!Record->getDeclName() && Record->isDefinition() && 2189 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { 2190 if (getLangOptions().CPlusPlus || 2191 Record->getDeclContext()->isRecord()) 2192 return BuildAnonymousStructOrUnion(S, DS, AS, Record); 2193 2194 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 2195 << DS.getSourceRange(); 2196 emittedWarning = true; 2197 } 2198 } 2199 2200 // Check for Microsoft C extension: anonymous struct. 2201 if (getLangOptions().Microsoft && !getLangOptions().CPlusPlus && 2202 CurContext->isRecord() && 2203 DS.getStorageClassSpec() == DeclSpec::SCS_unspecified) { 2204 // Handle 2 kinds of anonymous struct: 2205 // struct STRUCT; 2206 // and 2207 // STRUCT_TYPE; <- where STRUCT_TYPE is a typedef struct. 2208 RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag); 2209 if ((Record && Record->getDeclName() && !Record->isDefinition()) || 2210 (DS.getTypeSpecType() == DeclSpec::TST_typename && 2211 DS.getRepAsType().get()->isStructureType())) { 2212 Diag(DS.getSourceRange().getBegin(), diag::ext_ms_anonymous_struct) 2213 << DS.getSourceRange(); 2214 return BuildMicrosoftCAnonymousStruct(S, DS, Record); 2215 } 2216 } 2217 2218 if (getLangOptions().CPlusPlus && 2219 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) 2220 if (EnumDecl *Enum = dyn_cast_or_null<EnumDecl>(Tag)) 2221 if (Enum->enumerator_begin() == Enum->enumerator_end() && 2222 !Enum->getIdentifier() && !Enum->isInvalidDecl()) { 2223 Diag(Enum->getLocation(), diag::ext_no_declarators) 2224 << DS.getSourceRange(); 2225 emittedWarning = true; 2226 } 2227 2228 // Skip all the checks below if we have a type error. 2229 if (DS.getTypeSpecType() == DeclSpec::TST_error) return TagD; 2230 2231 if (!DS.isMissingDeclaratorOk()) { 2232 // Warn about typedefs of enums without names, since this is an 2233 // extension in both Microsoft and GNU. 2234 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 2235 Tag && isa<EnumDecl>(Tag)) { 2236 Diag(DS.getSourceRange().getBegin(), diag::ext_typedef_without_a_name) 2237 << DS.getSourceRange(); 2238 return Tag; 2239 } 2240 2241 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 2242 << DS.getSourceRange(); 2243 emittedWarning = true; 2244 } 2245 2246 // We're going to complain about a bunch of spurious specifiers; 2247 // only do this if we're declaring a tag, because otherwise we 2248 // should be getting diag::ext_no_declarators. 2249 if (emittedWarning || (TagD && TagD->isInvalidDecl())) 2250 return TagD; 2251 2252 // Note that a linkage-specification sets a storage class, but 2253 // 'extern "C" struct foo;' is actually valid and not theoretically 2254 // useless. 2255 if (DeclSpec::SCS scs = DS.getStorageClassSpec()) 2256 if (!DS.isExternInLinkageSpec()) 2257 Diag(DS.getStorageClassSpecLoc(), diag::warn_standalone_specifier) 2258 << DeclSpec::getSpecifierName(scs); 2259 2260 if (DS.isThreadSpecified()) 2261 Diag(DS.getThreadSpecLoc(), diag::warn_standalone_specifier) << "__thread"; 2262 if (DS.getTypeQualifiers()) { 2263 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2264 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "const"; 2265 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2266 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "volatile"; 2267 // Restrict is covered above. 2268 } 2269 if (DS.isInlineSpecified()) 2270 Diag(DS.getInlineSpecLoc(), diag::warn_standalone_specifier) << "inline"; 2271 if (DS.isVirtualSpecified()) 2272 Diag(DS.getVirtualSpecLoc(), diag::warn_standalone_specifier) << "virtual"; 2273 if (DS.isExplicitSpecified()) 2274 Diag(DS.getExplicitSpecLoc(), diag::warn_standalone_specifier) <<"explicit"; 2275 2276 // FIXME: Warn on useless attributes 2277 2278 return TagD; 2279} 2280 2281/// ActOnVlaStmt - This rouine if finds a vla expression in a decl spec. 2282/// builds a statement for it and returns it so it is evaluated. 2283StmtResult Sema::ActOnVlaStmt(const DeclSpec &DS) { 2284 StmtResult R; 2285 if (DS.getTypeSpecType() == DeclSpec::TST_typeofExpr) { 2286 Expr *Exp = DS.getRepAsExpr(); 2287 QualType Ty = Exp->getType(); 2288 if (Ty->isPointerType()) { 2289 do 2290 Ty = Ty->getAs<PointerType>()->getPointeeType(); 2291 while (Ty->isPointerType()); 2292 } 2293 if (Ty->isVariableArrayType()) { 2294 R = ActOnExprStmt(MakeFullExpr(Exp)); 2295 } 2296 } 2297 return R; 2298} 2299 2300/// We are trying to inject an anonymous member into the given scope; 2301/// check if there's an existing declaration that can't be overloaded. 2302/// 2303/// \return true if this is a forbidden redeclaration 2304static bool CheckAnonMemberRedeclaration(Sema &SemaRef, 2305 Scope *S, 2306 DeclContext *Owner, 2307 DeclarationName Name, 2308 SourceLocation NameLoc, 2309 unsigned diagnostic) { 2310 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupMemberName, 2311 Sema::ForRedeclaration); 2312 if (!SemaRef.LookupName(R, S)) return false; 2313 2314 if (R.getAsSingle<TagDecl>()) 2315 return false; 2316 2317 // Pick a representative declaration. 2318 NamedDecl *PrevDecl = R.getRepresentativeDecl()->getUnderlyingDecl(); 2319 assert(PrevDecl && "Expected a non-null Decl"); 2320 2321 if (!SemaRef.isDeclInScope(PrevDecl, Owner, S)) 2322 return false; 2323 2324 SemaRef.Diag(NameLoc, diagnostic) << Name; 2325 SemaRef.Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 2326 2327 return true; 2328} 2329 2330/// InjectAnonymousStructOrUnionMembers - Inject the members of the 2331/// anonymous struct or union AnonRecord into the owning context Owner 2332/// and scope S. This routine will be invoked just after we realize 2333/// that an unnamed union or struct is actually an anonymous union or 2334/// struct, e.g., 2335/// 2336/// @code 2337/// union { 2338/// int i; 2339/// float f; 2340/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 2341/// // f into the surrounding scope.x 2342/// @endcode 2343/// 2344/// This routine is recursive, injecting the names of nested anonymous 2345/// structs/unions into the owning context and scope as well. 2346static bool InjectAnonymousStructOrUnionMembers(Sema &SemaRef, Scope *S, 2347 DeclContext *Owner, 2348 RecordDecl *AnonRecord, 2349 AccessSpecifier AS, 2350 llvm::SmallVector<NamedDecl*, 2> &Chaining, 2351 bool MSAnonStruct) { 2352 unsigned diagKind 2353 = AnonRecord->isUnion() ? diag::err_anonymous_union_member_redecl 2354 : diag::err_anonymous_struct_member_redecl; 2355 2356 bool Invalid = false; 2357 2358 // Look every FieldDecl and IndirectFieldDecl with a name. 2359 for (RecordDecl::decl_iterator D = AnonRecord->decls_begin(), 2360 DEnd = AnonRecord->decls_end(); 2361 D != DEnd; ++D) { 2362 if ((isa<FieldDecl>(*D) || isa<IndirectFieldDecl>(*D)) && 2363 cast<NamedDecl>(*D)->getDeclName()) { 2364 ValueDecl *VD = cast<ValueDecl>(*D); 2365 if (CheckAnonMemberRedeclaration(SemaRef, S, Owner, VD->getDeclName(), 2366 VD->getLocation(), diagKind)) { 2367 // C++ [class.union]p2: 2368 // The names of the members of an anonymous union shall be 2369 // distinct from the names of any other entity in the 2370 // scope in which the anonymous union is declared. 2371 Invalid = true; 2372 } else { 2373 // C++ [class.union]p2: 2374 // For the purpose of name lookup, after the anonymous union 2375 // definition, the members of the anonymous union are 2376 // considered to have been defined in the scope in which the 2377 // anonymous union is declared. 2378 unsigned OldChainingSize = Chaining.size(); 2379 if (IndirectFieldDecl *IF = dyn_cast<IndirectFieldDecl>(VD)) 2380 for (IndirectFieldDecl::chain_iterator PI = IF->chain_begin(), 2381 PE = IF->chain_end(); PI != PE; ++PI) 2382 Chaining.push_back(*PI); 2383 else 2384 Chaining.push_back(VD); 2385 2386 assert(Chaining.size() >= 2); 2387 NamedDecl **NamedChain = 2388 new (SemaRef.Context)NamedDecl*[Chaining.size()]; 2389 for (unsigned i = 0; i < Chaining.size(); i++) 2390 NamedChain[i] = Chaining[i]; 2391 2392 IndirectFieldDecl* IndirectField = 2393 IndirectFieldDecl::Create(SemaRef.Context, Owner, VD->getLocation(), 2394 VD->getIdentifier(), VD->getType(), 2395 NamedChain, Chaining.size()); 2396 2397 IndirectField->setAccess(AS); 2398 IndirectField->setImplicit(); 2399 SemaRef.PushOnScopeChains(IndirectField, S); 2400 2401 // That includes picking up the appropriate access specifier. 2402 if (AS != AS_none) IndirectField->setAccess(AS); 2403 2404 Chaining.resize(OldChainingSize); 2405 } 2406 } 2407 } 2408 2409 return Invalid; 2410} 2411 2412/// StorageClassSpecToVarDeclStorageClass - Maps a DeclSpec::SCS to 2413/// a VarDecl::StorageClass. Any error reporting is up to the caller: 2414/// illegal input values are mapped to SC_None. 2415static StorageClass 2416StorageClassSpecToVarDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2417 switch (StorageClassSpec) { 2418 case DeclSpec::SCS_unspecified: return SC_None; 2419 case DeclSpec::SCS_extern: return SC_Extern; 2420 case DeclSpec::SCS_static: return SC_Static; 2421 case DeclSpec::SCS_auto: return SC_Auto; 2422 case DeclSpec::SCS_register: return SC_Register; 2423 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2424 // Illegal SCSs map to None: error reporting is up to the caller. 2425 case DeclSpec::SCS_mutable: // Fall through. 2426 case DeclSpec::SCS_typedef: return SC_None; 2427 } 2428 llvm_unreachable("unknown storage class specifier"); 2429} 2430 2431/// StorageClassSpecToFunctionDeclStorageClass - Maps a DeclSpec::SCS to 2432/// a StorageClass. Any error reporting is up to the caller: 2433/// illegal input values are mapped to SC_None. 2434static StorageClass 2435StorageClassSpecToFunctionDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2436 switch (StorageClassSpec) { 2437 case DeclSpec::SCS_unspecified: return SC_None; 2438 case DeclSpec::SCS_extern: return SC_Extern; 2439 case DeclSpec::SCS_static: return SC_Static; 2440 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2441 // Illegal SCSs map to None: error reporting is up to the caller. 2442 case DeclSpec::SCS_auto: // Fall through. 2443 case DeclSpec::SCS_mutable: // Fall through. 2444 case DeclSpec::SCS_register: // Fall through. 2445 case DeclSpec::SCS_typedef: return SC_None; 2446 } 2447 llvm_unreachable("unknown storage class specifier"); 2448} 2449 2450/// BuildAnonymousStructOrUnion - Handle the declaration of an 2451/// anonymous structure or union. Anonymous unions are a C++ feature 2452/// (C++ [class.union]) and a GNU C extension; anonymous structures 2453/// are a GNU C and GNU C++ extension. 2454Decl *Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 2455 AccessSpecifier AS, 2456 RecordDecl *Record) { 2457 DeclContext *Owner = Record->getDeclContext(); 2458 2459 // Diagnose whether this anonymous struct/union is an extension. 2460 if (Record->isUnion() && !getLangOptions().CPlusPlus) 2461 Diag(Record->getLocation(), diag::ext_anonymous_union); 2462 else if (!Record->isUnion()) 2463 Diag(Record->getLocation(), diag::ext_anonymous_struct); 2464 2465 // C and C++ require different kinds of checks for anonymous 2466 // structs/unions. 2467 bool Invalid = false; 2468 if (getLangOptions().CPlusPlus) { 2469 const char* PrevSpec = 0; 2470 unsigned DiagID; 2471 // C++ [class.union]p3: 2472 // Anonymous unions declared in a named namespace or in the 2473 // global namespace shall be declared static. 2474 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 2475 (isa<TranslationUnitDecl>(Owner) || 2476 (isa<NamespaceDecl>(Owner) && 2477 cast<NamespaceDecl>(Owner)->getDeclName()))) { 2478 Diag(Record->getLocation(), diag::err_anonymous_union_not_static); 2479 Invalid = true; 2480 2481 // Recover by adding 'static'. 2482 DS.SetStorageClassSpec(DeclSpec::SCS_static, SourceLocation(), 2483 PrevSpec, DiagID, getLangOptions()); 2484 } 2485 // C++ [class.union]p3: 2486 // A storage class is not allowed in a declaration of an 2487 // anonymous union in a class scope. 2488 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 2489 isa<RecordDecl>(Owner)) { 2490 Diag(DS.getStorageClassSpecLoc(), 2491 diag::err_anonymous_union_with_storage_spec); 2492 Invalid = true; 2493 2494 // Recover by removing the storage specifier. 2495 DS.SetStorageClassSpec(DeclSpec::SCS_unspecified, SourceLocation(), 2496 PrevSpec, DiagID, getLangOptions()); 2497 } 2498 2499 // Ignore const/volatile/restrict qualifiers. 2500 if (DS.getTypeQualifiers()) { 2501 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2502 Diag(DS.getConstSpecLoc(), diag::ext_anonymous_struct_union_qualified) 2503 << Record->isUnion() << 0 2504 << FixItHint::CreateRemoval(DS.getConstSpecLoc()); 2505 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2506 Diag(DS.getVolatileSpecLoc(), diag::ext_anonymous_struct_union_qualified) 2507 << Record->isUnion() << 1 2508 << FixItHint::CreateRemoval(DS.getVolatileSpecLoc()); 2509 if (DS.getTypeQualifiers() & DeclSpec::TQ_restrict) 2510 Diag(DS.getRestrictSpecLoc(), diag::ext_anonymous_struct_union_qualified) 2511 << Record->isUnion() << 2 2512 << FixItHint::CreateRemoval(DS.getRestrictSpecLoc()); 2513 2514 DS.ClearTypeQualifiers(); 2515 } 2516 2517 // C++ [class.union]p2: 2518 // The member-specification of an anonymous union shall only 2519 // define non-static data members. [Note: nested types and 2520 // functions cannot be declared within an anonymous union. ] 2521 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 2522 MemEnd = Record->decls_end(); 2523 Mem != MemEnd; ++Mem) { 2524 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 2525 // C++ [class.union]p3: 2526 // An anonymous union shall not have private or protected 2527 // members (clause 11). 2528 assert(FD->getAccess() != AS_none); 2529 if (FD->getAccess() != AS_public) { 2530 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 2531 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 2532 Invalid = true; 2533 } 2534 2535 if (CheckNontrivialField(FD)) 2536 Invalid = true; 2537 } else if ((*Mem)->isImplicit()) { 2538 // Any implicit members are fine. 2539 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 2540 // This is a type that showed up in an 2541 // elaborated-type-specifier inside the anonymous struct or 2542 // union, but which actually declares a type outside of the 2543 // anonymous struct or union. It's okay. 2544 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 2545 if (!MemRecord->isAnonymousStructOrUnion() && 2546 MemRecord->getDeclName()) { 2547 // Visual C++ allows type definition in anonymous struct or union. 2548 if (getLangOptions().Microsoft) 2549 Diag(MemRecord->getLocation(), diag::ext_anonymous_record_with_type) 2550 << (int)Record->isUnion(); 2551 else { 2552 // This is a nested type declaration. 2553 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 2554 << (int)Record->isUnion(); 2555 Invalid = true; 2556 } 2557 } 2558 } else if (isa<AccessSpecDecl>(*Mem)) { 2559 // Any access specifier is fine. 2560 } else { 2561 // We have something that isn't a non-static data 2562 // member. Complain about it. 2563 unsigned DK = diag::err_anonymous_record_bad_member; 2564 if (isa<TypeDecl>(*Mem)) 2565 DK = diag::err_anonymous_record_with_type; 2566 else if (isa<FunctionDecl>(*Mem)) 2567 DK = diag::err_anonymous_record_with_function; 2568 else if (isa<VarDecl>(*Mem)) 2569 DK = diag::err_anonymous_record_with_static; 2570 2571 // Visual C++ allows type definition in anonymous struct or union. 2572 if (getLangOptions().Microsoft && 2573 DK == diag::err_anonymous_record_with_type) 2574 Diag((*Mem)->getLocation(), diag::ext_anonymous_record_with_type) 2575 << (int)Record->isUnion(); 2576 else { 2577 Diag((*Mem)->getLocation(), DK) 2578 << (int)Record->isUnion(); 2579 Invalid = true; 2580 } 2581 } 2582 } 2583 } 2584 2585 if (!Record->isUnion() && !Owner->isRecord()) { 2586 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 2587 << (int)getLangOptions().CPlusPlus; 2588 Invalid = true; 2589 } 2590 2591 // Mock up a declarator. 2592 Declarator Dc(DS, Declarator::TypeNameContext); 2593 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2594 assert(TInfo && "couldn't build declarator info for anonymous struct/union"); 2595 2596 // Create a declaration for this anonymous struct/union. 2597 NamedDecl *Anon = 0; 2598 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 2599 Anon = FieldDecl::Create(Context, OwningClass, 2600 DS.getSourceRange().getBegin(), 2601 Record->getLocation(), 2602 /*IdentifierInfo=*/0, 2603 Context.getTypeDeclType(Record), 2604 TInfo, 2605 /*BitWidth=*/0, /*Mutable=*/false); 2606 Anon->setAccess(AS); 2607 if (getLangOptions().CPlusPlus) 2608 FieldCollector->Add(cast<FieldDecl>(Anon)); 2609 } else { 2610 DeclSpec::SCS SCSpec = DS.getStorageClassSpec(); 2611 assert(SCSpec != DeclSpec::SCS_typedef && 2612 "Parser allowed 'typedef' as storage class VarDecl."); 2613 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 2614 if (SCSpec == DeclSpec::SCS_mutable) { 2615 // mutable can only appear on non-static class members, so it's always 2616 // an error here 2617 Diag(Record->getLocation(), diag::err_mutable_nonmember); 2618 Invalid = true; 2619 SC = SC_None; 2620 } 2621 SCSpec = DS.getStorageClassSpecAsWritten(); 2622 VarDecl::StorageClass SCAsWritten 2623 = StorageClassSpecToVarDeclStorageClass(SCSpec); 2624 2625 Anon = VarDecl::Create(Context, Owner, 2626 DS.getSourceRange().getBegin(), 2627 Record->getLocation(), /*IdentifierInfo=*/0, 2628 Context.getTypeDeclType(Record), 2629 TInfo, SC, SCAsWritten); 2630 } 2631 Anon->setImplicit(); 2632 2633 // Add the anonymous struct/union object to the current 2634 // context. We'll be referencing this object when we refer to one of 2635 // its members. 2636 Owner->addDecl(Anon); 2637 2638 // Inject the members of the anonymous struct/union into the owning 2639 // context and into the identifier resolver chain for name lookup 2640 // purposes. 2641 llvm::SmallVector<NamedDecl*, 2> Chain; 2642 Chain.push_back(Anon); 2643 2644 if (InjectAnonymousStructOrUnionMembers(*this, S, Owner, Record, AS, 2645 Chain, false)) 2646 Invalid = true; 2647 2648 // Mark this as an anonymous struct/union type. Note that we do not 2649 // do this until after we have already checked and injected the 2650 // members of this anonymous struct/union type, because otherwise 2651 // the members could be injected twice: once by DeclContext when it 2652 // builds its lookup table, and once by 2653 // InjectAnonymousStructOrUnionMembers. 2654 Record->setAnonymousStructOrUnion(true); 2655 2656 if (Invalid) 2657 Anon->setInvalidDecl(); 2658 2659 return Anon; 2660} 2661 2662/// BuildMicrosoftCAnonymousStruct - Handle the declaration of an 2663/// Microsoft C anonymous structure. 2664/// Ref: http://msdn.microsoft.com/en-us/library/z2cx9y4f.aspx 2665/// Example: 2666/// 2667/// struct A { int a; }; 2668/// struct B { struct A; int b; }; 2669/// 2670/// void foo() { 2671/// B var; 2672/// var.a = 3; 2673/// } 2674/// 2675Decl *Sema::BuildMicrosoftCAnonymousStruct(Scope *S, DeclSpec &DS, 2676 RecordDecl *Record) { 2677 2678 // If there is no Record, get the record via the typedef. 2679 if (!Record) 2680 Record = DS.getRepAsType().get()->getAsStructureType()->getDecl(); 2681 2682 // Mock up a declarator. 2683 Declarator Dc(DS, Declarator::TypeNameContext); 2684 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2685 assert(TInfo && "couldn't build declarator info for anonymous struct"); 2686 2687 // Create a declaration for this anonymous struct. 2688 NamedDecl* Anon = FieldDecl::Create(Context, 2689 cast<RecordDecl>(CurContext), 2690 DS.getSourceRange().getBegin(), 2691 DS.getSourceRange().getBegin(), 2692 /*IdentifierInfo=*/0, 2693 Context.getTypeDeclType(Record), 2694 TInfo, 2695 /*BitWidth=*/0, /*Mutable=*/false); 2696 Anon->setImplicit(); 2697 2698 // Add the anonymous struct object to the current context. 2699 CurContext->addDecl(Anon); 2700 2701 // Inject the members of the anonymous struct into the current 2702 // context and into the identifier resolver chain for name lookup 2703 // purposes. 2704 llvm::SmallVector<NamedDecl*, 2> Chain; 2705 Chain.push_back(Anon); 2706 2707 if (InjectAnonymousStructOrUnionMembers(*this, S, CurContext, 2708 Record->getDefinition(), 2709 AS_none, Chain, true)) 2710 Anon->setInvalidDecl(); 2711 2712 return Anon; 2713} 2714 2715/// GetNameForDeclarator - Determine the full declaration name for the 2716/// given Declarator. 2717DeclarationNameInfo Sema::GetNameForDeclarator(Declarator &D) { 2718 return GetNameFromUnqualifiedId(D.getName()); 2719} 2720 2721/// \brief Retrieves the declaration name from a parsed unqualified-id. 2722DeclarationNameInfo 2723Sema::GetNameFromUnqualifiedId(const UnqualifiedId &Name) { 2724 DeclarationNameInfo NameInfo; 2725 NameInfo.setLoc(Name.StartLocation); 2726 2727 switch (Name.getKind()) { 2728 2729 case UnqualifiedId::IK_Identifier: 2730 NameInfo.setName(Name.Identifier); 2731 NameInfo.setLoc(Name.StartLocation); 2732 return NameInfo; 2733 2734 case UnqualifiedId::IK_OperatorFunctionId: 2735 NameInfo.setName(Context.DeclarationNames.getCXXOperatorName( 2736 Name.OperatorFunctionId.Operator)); 2737 NameInfo.setLoc(Name.StartLocation); 2738 NameInfo.getInfo().CXXOperatorName.BeginOpNameLoc 2739 = Name.OperatorFunctionId.SymbolLocations[0]; 2740 NameInfo.getInfo().CXXOperatorName.EndOpNameLoc 2741 = Name.EndLocation.getRawEncoding(); 2742 return NameInfo; 2743 2744 case UnqualifiedId::IK_LiteralOperatorId: 2745 NameInfo.setName(Context.DeclarationNames.getCXXLiteralOperatorName( 2746 Name.Identifier)); 2747 NameInfo.setLoc(Name.StartLocation); 2748 NameInfo.setCXXLiteralOperatorNameLoc(Name.EndLocation); 2749 return NameInfo; 2750 2751 case UnqualifiedId::IK_ConversionFunctionId: { 2752 TypeSourceInfo *TInfo; 2753 QualType Ty = GetTypeFromParser(Name.ConversionFunctionId, &TInfo); 2754 if (Ty.isNull()) 2755 return DeclarationNameInfo(); 2756 NameInfo.setName(Context.DeclarationNames.getCXXConversionFunctionName( 2757 Context.getCanonicalType(Ty))); 2758 NameInfo.setLoc(Name.StartLocation); 2759 NameInfo.setNamedTypeInfo(TInfo); 2760 return NameInfo; 2761 } 2762 2763 case UnqualifiedId::IK_ConstructorName: { 2764 TypeSourceInfo *TInfo; 2765 QualType Ty = GetTypeFromParser(Name.ConstructorName, &TInfo); 2766 if (Ty.isNull()) 2767 return DeclarationNameInfo(); 2768 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 2769 Context.getCanonicalType(Ty))); 2770 NameInfo.setLoc(Name.StartLocation); 2771 NameInfo.setNamedTypeInfo(TInfo); 2772 return NameInfo; 2773 } 2774 2775 case UnqualifiedId::IK_ConstructorTemplateId: { 2776 // In well-formed code, we can only have a constructor 2777 // template-id that refers to the current context, so go there 2778 // to find the actual type being constructed. 2779 CXXRecordDecl *CurClass = dyn_cast<CXXRecordDecl>(CurContext); 2780 if (!CurClass || CurClass->getIdentifier() != Name.TemplateId->Name) 2781 return DeclarationNameInfo(); 2782 2783 // Determine the type of the class being constructed. 2784 QualType CurClassType = Context.getTypeDeclType(CurClass); 2785 2786 // FIXME: Check two things: that the template-id names the same type as 2787 // CurClassType, and that the template-id does not occur when the name 2788 // was qualified. 2789 2790 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 2791 Context.getCanonicalType(CurClassType))); 2792 NameInfo.setLoc(Name.StartLocation); 2793 // FIXME: should we retrieve TypeSourceInfo? 2794 NameInfo.setNamedTypeInfo(0); 2795 return NameInfo; 2796 } 2797 2798 case UnqualifiedId::IK_DestructorName: { 2799 TypeSourceInfo *TInfo; 2800 QualType Ty = GetTypeFromParser(Name.DestructorName, &TInfo); 2801 if (Ty.isNull()) 2802 return DeclarationNameInfo(); 2803 NameInfo.setName(Context.DeclarationNames.getCXXDestructorName( 2804 Context.getCanonicalType(Ty))); 2805 NameInfo.setLoc(Name.StartLocation); 2806 NameInfo.setNamedTypeInfo(TInfo); 2807 return NameInfo; 2808 } 2809 2810 case UnqualifiedId::IK_TemplateId: { 2811 TemplateName TName = Name.TemplateId->Template.get(); 2812 SourceLocation TNameLoc = Name.TemplateId->TemplateNameLoc; 2813 return Context.getNameForTemplate(TName, TNameLoc); 2814 } 2815 2816 } // switch (Name.getKind()) 2817 2818 assert(false && "Unknown name kind"); 2819 return DeclarationNameInfo(); 2820} 2821 2822/// isNearlyMatchingFunction - Determine whether the C++ functions 2823/// Declaration and Definition are "nearly" matching. This heuristic 2824/// is used to improve diagnostics in the case where an out-of-line 2825/// function definition doesn't match any declaration within 2826/// the class or namespace. 2827static bool isNearlyMatchingFunction(ASTContext &Context, 2828 FunctionDecl *Declaration, 2829 FunctionDecl *Definition) { 2830 if (Declaration->param_size() != Definition->param_size()) 2831 return false; 2832 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 2833 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 2834 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 2835 2836 if (!Context.hasSameUnqualifiedType(DeclParamTy.getNonReferenceType(), 2837 DefParamTy.getNonReferenceType())) 2838 return false; 2839 } 2840 2841 return true; 2842} 2843 2844/// NeedsRebuildingInCurrentInstantiation - Checks whether the given 2845/// declarator needs to be rebuilt in the current instantiation. 2846/// Any bits of declarator which appear before the name are valid for 2847/// consideration here. That's specifically the type in the decl spec 2848/// and the base type in any member-pointer chunks. 2849static bool RebuildDeclaratorInCurrentInstantiation(Sema &S, Declarator &D, 2850 DeclarationName Name) { 2851 // The types we specifically need to rebuild are: 2852 // - typenames, typeofs, and decltypes 2853 // - types which will become injected class names 2854 // Of course, we also need to rebuild any type referencing such a 2855 // type. It's safest to just say "dependent", but we call out a 2856 // few cases here. 2857 2858 DeclSpec &DS = D.getMutableDeclSpec(); 2859 switch (DS.getTypeSpecType()) { 2860 case DeclSpec::TST_typename: 2861 case DeclSpec::TST_typeofType: 2862 case DeclSpec::TST_decltype: { 2863 // Grab the type from the parser. 2864 TypeSourceInfo *TSI = 0; 2865 QualType T = S.GetTypeFromParser(DS.getRepAsType(), &TSI); 2866 if (T.isNull() || !T->isDependentType()) break; 2867 2868 // Make sure there's a type source info. This isn't really much 2869 // of a waste; most dependent types should have type source info 2870 // attached already. 2871 if (!TSI) 2872 TSI = S.Context.getTrivialTypeSourceInfo(T, DS.getTypeSpecTypeLoc()); 2873 2874 // Rebuild the type in the current instantiation. 2875 TSI = S.RebuildTypeInCurrentInstantiation(TSI, D.getIdentifierLoc(), Name); 2876 if (!TSI) return true; 2877 2878 // Store the new type back in the decl spec. 2879 ParsedType LocType = S.CreateParsedType(TSI->getType(), TSI); 2880 DS.UpdateTypeRep(LocType); 2881 break; 2882 } 2883 2884 case DeclSpec::TST_typeofExpr: { 2885 Expr *E = DS.getRepAsExpr(); 2886 ExprResult Result = S.RebuildExprInCurrentInstantiation(E); 2887 if (Result.isInvalid()) return true; 2888 DS.UpdateExprRep(Result.get()); 2889 break; 2890 } 2891 2892 default: 2893 // Nothing to do for these decl specs. 2894 break; 2895 } 2896 2897 // It doesn't matter what order we do this in. 2898 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) { 2899 DeclaratorChunk &Chunk = D.getTypeObject(I); 2900 2901 // The only type information in the declarator which can come 2902 // before the declaration name is the base type of a member 2903 // pointer. 2904 if (Chunk.Kind != DeclaratorChunk::MemberPointer) 2905 continue; 2906 2907 // Rebuild the scope specifier in-place. 2908 CXXScopeSpec &SS = Chunk.Mem.Scope(); 2909 if (S.RebuildNestedNameSpecifierInCurrentInstantiation(SS)) 2910 return true; 2911 } 2912 2913 return false; 2914} 2915 2916Decl *Sema::ActOnDeclarator(Scope *S, Declarator &D, 2917 bool IsFunctionDefinition) { 2918 return HandleDeclarator(S, D, MultiTemplateParamsArg(*this), 2919 IsFunctionDefinition); 2920} 2921 2922/// DiagnoseClassNameShadow - Implement C++ [class.mem]p13: 2923/// If T is the name of a class, then each of the following shall have a 2924/// name different from T: 2925/// - every static data member of class T; 2926/// - every member function of class T 2927/// - every member of class T that is itself a type; 2928/// \returns true if the declaration name violates these rules. 2929bool Sema::DiagnoseClassNameShadow(DeclContext *DC, 2930 DeclarationNameInfo NameInfo) { 2931 DeclarationName Name = NameInfo.getName(); 2932 2933 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(DC)) 2934 if (Record->getIdentifier() && Record->getDeclName() == Name) { 2935 Diag(NameInfo.getLoc(), diag::err_member_name_of_class) << Name; 2936 return true; 2937 } 2938 2939 return false; 2940} 2941 2942Decl *Sema::HandleDeclarator(Scope *S, Declarator &D, 2943 MultiTemplateParamsArg TemplateParamLists, 2944 bool IsFunctionDefinition) { 2945 // TODO: consider using NameInfo for diagnostic. 2946 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 2947 DeclarationName Name = NameInfo.getName(); 2948 2949 // All of these full declarators require an identifier. If it doesn't have 2950 // one, the ParsedFreeStandingDeclSpec action should be used. 2951 if (!Name) { 2952 if (!D.isInvalidType()) // Reject this if we think it is valid. 2953 Diag(D.getDeclSpec().getSourceRange().getBegin(), 2954 diag::err_declarator_need_ident) 2955 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 2956 return 0; 2957 } else if (DiagnoseUnexpandedParameterPack(NameInfo, UPPC_DeclarationType)) 2958 return 0; 2959 2960 // The scope passed in may not be a decl scope. Zip up the scope tree until 2961 // we find one that is. 2962 while ((S->getFlags() & Scope::DeclScope) == 0 || 2963 (S->getFlags() & Scope::TemplateParamScope) != 0) 2964 S = S->getParent(); 2965 2966 DeclContext *DC = CurContext; 2967 if (D.getCXXScopeSpec().isInvalid()) 2968 D.setInvalidType(); 2969 else if (D.getCXXScopeSpec().isSet()) { 2970 if (DiagnoseUnexpandedParameterPack(D.getCXXScopeSpec(), 2971 UPPC_DeclarationQualifier)) 2972 return 0; 2973 2974 bool EnteringContext = !D.getDeclSpec().isFriendSpecified(); 2975 DC = computeDeclContext(D.getCXXScopeSpec(), EnteringContext); 2976 if (!DC) { 2977 // If we could not compute the declaration context, it's because the 2978 // declaration context is dependent but does not refer to a class, 2979 // class template, or class template partial specialization. Complain 2980 // and return early, to avoid the coming semantic disaster. 2981 Diag(D.getIdentifierLoc(), 2982 diag::err_template_qualified_declarator_no_match) 2983 << (NestedNameSpecifier*)D.getCXXScopeSpec().getScopeRep() 2984 << D.getCXXScopeSpec().getRange(); 2985 return 0; 2986 } 2987 bool IsDependentContext = DC->isDependentContext(); 2988 2989 if (!IsDependentContext && 2990 RequireCompleteDeclContext(D.getCXXScopeSpec(), DC)) 2991 return 0; 2992 2993 if (isa<CXXRecordDecl>(DC)) { 2994 if (!cast<CXXRecordDecl>(DC)->hasDefinition()) { 2995 Diag(D.getIdentifierLoc(), 2996 diag::err_member_def_undefined_record) 2997 << Name << DC << D.getCXXScopeSpec().getRange(); 2998 D.setInvalidType(); 2999 } else if (isa<CXXRecordDecl>(CurContext) && 3000 !D.getDeclSpec().isFriendSpecified()) { 3001 // The user provided a superfluous scope specifier inside a class 3002 // definition: 3003 // 3004 // class X { 3005 // void X::f(); 3006 // }; 3007 if (CurContext->Equals(DC)) 3008 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 3009 << Name << FixItHint::CreateRemoval(D.getCXXScopeSpec().getRange()); 3010 else 3011 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 3012 << Name << D.getCXXScopeSpec().getRange(); 3013 3014 // Pretend that this qualifier was not here. 3015 D.getCXXScopeSpec().clear(); 3016 } 3017 } 3018 3019 // Check whether we need to rebuild the type of the given 3020 // declaration in the current instantiation. 3021 if (EnteringContext && IsDependentContext && 3022 TemplateParamLists.size() != 0) { 3023 ContextRAII SavedContext(*this, DC); 3024 if (RebuildDeclaratorInCurrentInstantiation(*this, D, Name)) 3025 D.setInvalidType(); 3026 } 3027 } 3028 3029 if (DiagnoseClassNameShadow(DC, NameInfo)) 3030 // If this is a typedef, we'll end up spewing multiple diagnostics. 3031 // Just return early; it's safer. 3032 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3033 return 0; 3034 3035 NamedDecl *New; 3036 3037 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 3038 QualType R = TInfo->getType(); 3039 3040 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 3041 UPPC_DeclarationType)) 3042 D.setInvalidType(); 3043 3044 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 3045 ForRedeclaration); 3046 3047 // See if this is a redefinition of a variable in the same scope. 3048 if (!D.getCXXScopeSpec().isSet()) { 3049 bool IsLinkageLookup = false; 3050 3051 // If the declaration we're planning to build will be a function 3052 // or object with linkage, then look for another declaration with 3053 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 3054 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3055 /* Do nothing*/; 3056 else if (R->isFunctionType()) { 3057 if (CurContext->isFunctionOrMethod() || 3058 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3059 IsLinkageLookup = true; 3060 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 3061 IsLinkageLookup = true; 3062 else if (CurContext->getRedeclContext()->isTranslationUnit() && 3063 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3064 IsLinkageLookup = true; 3065 3066 if (IsLinkageLookup) 3067 Previous.clear(LookupRedeclarationWithLinkage); 3068 3069 LookupName(Previous, S, /* CreateBuiltins = */ IsLinkageLookup); 3070 } else { // Something like "int foo::x;" 3071 LookupQualifiedName(Previous, DC); 3072 3073 // Don't consider using declarations as previous declarations for 3074 // out-of-line members. 3075 RemoveUsingDecls(Previous); 3076 3077 // C++ 7.3.1.2p2: 3078 // Members (including explicit specializations of templates) of a named 3079 // namespace can also be defined outside that namespace by explicit 3080 // qualification of the name being defined, provided that the entity being 3081 // defined was already declared in the namespace and the definition appears 3082 // after the point of declaration in a namespace that encloses the 3083 // declarations namespace. 3084 // 3085 // Note that we only check the context at this point. We don't yet 3086 // have enough information to make sure that PrevDecl is actually 3087 // the declaration we want to match. For example, given: 3088 // 3089 // class X { 3090 // void f(); 3091 // void f(float); 3092 // }; 3093 // 3094 // void X::f(int) { } // ill-formed 3095 // 3096 // In this case, PrevDecl will point to the overload set 3097 // containing the two f's declared in X, but neither of them 3098 // matches. 3099 3100 // First check whether we named the global scope. 3101 if (isa<TranslationUnitDecl>(DC)) { 3102 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 3103 << Name << D.getCXXScopeSpec().getRange(); 3104 } else { 3105 DeclContext *Cur = CurContext; 3106 while (isa<LinkageSpecDecl>(Cur)) 3107 Cur = Cur->getParent(); 3108 if (!Cur->Encloses(DC)) { 3109 // The qualifying scope doesn't enclose the original declaration. 3110 // Emit diagnostic based on current scope. 3111 SourceLocation L = D.getIdentifierLoc(); 3112 SourceRange R = D.getCXXScopeSpec().getRange(); 3113 if (isa<FunctionDecl>(Cur)) 3114 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 3115 else 3116 Diag(L, diag::err_invalid_declarator_scope) 3117 << Name << cast<NamedDecl>(DC) << R; 3118 D.setInvalidType(); 3119 } 3120 } 3121 } 3122 3123 if (Previous.isSingleResult() && 3124 Previous.getFoundDecl()->isTemplateParameter()) { 3125 // Maybe we will complain about the shadowed template parameter. 3126 if (!D.isInvalidType()) 3127 if (DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), 3128 Previous.getFoundDecl())) 3129 D.setInvalidType(); 3130 3131 // Just pretend that we didn't see the previous declaration. 3132 Previous.clear(); 3133 } 3134 3135 // In C++, the previous declaration we find might be a tag type 3136 // (class or enum). In this case, the new declaration will hide the 3137 // tag type. Note that this does does not apply if we're declaring a 3138 // typedef (C++ [dcl.typedef]p4). 3139 if (Previous.isSingleTagDecl() && 3140 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 3141 Previous.clear(); 3142 3143 bool Redeclaration = false; 3144 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 3145 if (TemplateParamLists.size()) { 3146 Diag(D.getIdentifierLoc(), diag::err_template_typedef); 3147 return 0; 3148 } 3149 3150 New = ActOnTypedefDeclarator(S, D, DC, R, TInfo, Previous, Redeclaration); 3151 } else if (R->isFunctionType()) { 3152 New = ActOnFunctionDeclarator(S, D, DC, R, TInfo, Previous, 3153 move(TemplateParamLists), 3154 IsFunctionDefinition, Redeclaration); 3155 } else { 3156 New = ActOnVariableDeclarator(S, D, DC, R, TInfo, Previous, 3157 move(TemplateParamLists), 3158 Redeclaration); 3159 } 3160 3161 if (New == 0) 3162 return 0; 3163 3164 // If this has an identifier and is not an invalid redeclaration or 3165 // function template specialization, add it to the scope stack. 3166 if (New->getDeclName() && !(Redeclaration && New->isInvalidDecl())) 3167 PushOnScopeChains(New, S); 3168 3169 return New; 3170} 3171 3172/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 3173/// types into constant array types in certain situations which would otherwise 3174/// be errors (for GCC compatibility). 3175static QualType TryToFixInvalidVariablyModifiedType(QualType T, 3176 ASTContext &Context, 3177 bool &SizeIsNegative, 3178 llvm::APSInt &Oversized) { 3179 // This method tries to turn a variable array into a constant 3180 // array even when the size isn't an ICE. This is necessary 3181 // for compatibility with code that depends on gcc's buggy 3182 // constant expression folding, like struct {char x[(int)(char*)2];} 3183 SizeIsNegative = false; 3184 Oversized = 0; 3185 3186 if (T->isDependentType()) 3187 return QualType(); 3188 3189 QualifierCollector Qs; 3190 const Type *Ty = Qs.strip(T); 3191 3192 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) { 3193 QualType Pointee = PTy->getPointeeType(); 3194 QualType FixedType = 3195 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative, 3196 Oversized); 3197 if (FixedType.isNull()) return FixedType; 3198 FixedType = Context.getPointerType(FixedType); 3199 return Qs.apply(Context, FixedType); 3200 } 3201 if (const ParenType* PTy = dyn_cast<ParenType>(Ty)) { 3202 QualType Inner = PTy->getInnerType(); 3203 QualType FixedType = 3204 TryToFixInvalidVariablyModifiedType(Inner, Context, SizeIsNegative, 3205 Oversized); 3206 if (FixedType.isNull()) return FixedType; 3207 FixedType = Context.getParenType(FixedType); 3208 return Qs.apply(Context, FixedType); 3209 } 3210 3211 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 3212 if (!VLATy) 3213 return QualType(); 3214 // FIXME: We should probably handle this case 3215 if (VLATy->getElementType()->isVariablyModifiedType()) 3216 return QualType(); 3217 3218 Expr::EvalResult EvalResult; 3219 if (!VLATy->getSizeExpr() || 3220 !VLATy->getSizeExpr()->Evaluate(EvalResult, Context) || 3221 !EvalResult.Val.isInt()) 3222 return QualType(); 3223 3224 // Check whether the array size is negative. 3225 llvm::APSInt &Res = EvalResult.Val.getInt(); 3226 if (Res.isSigned() && Res.isNegative()) { 3227 SizeIsNegative = true; 3228 return QualType(); 3229 } 3230 3231 // Check whether the array is too large to be addressed. 3232 unsigned ActiveSizeBits 3233 = ConstantArrayType::getNumAddressingBits(Context, VLATy->getElementType(), 3234 Res); 3235 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) { 3236 Oversized = Res; 3237 return QualType(); 3238 } 3239 3240 return Context.getConstantArrayType(VLATy->getElementType(), 3241 Res, ArrayType::Normal, 0); 3242} 3243 3244/// \brief Register the given locally-scoped external C declaration so 3245/// that it can be found later for redeclarations 3246void 3247Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, 3248 const LookupResult &Previous, 3249 Scope *S) { 3250 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 3251 "Decl is not a locally-scoped decl!"); 3252 // Note that we have a locally-scoped external with this name. 3253 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 3254 3255 if (!Previous.isSingleResult()) 3256 return; 3257 3258 NamedDecl *PrevDecl = Previous.getFoundDecl(); 3259 3260 // If there was a previous declaration of this variable, it may be 3261 // in our identifier chain. Update the identifier chain with the new 3262 // declaration. 3263 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 3264 // The previous declaration was found on the identifer resolver 3265 // chain, so remove it from its scope. 3266 while (S && !S->isDeclScope(PrevDecl)) 3267 S = S->getParent(); 3268 3269 if (S) 3270 S->RemoveDecl(PrevDecl); 3271 } 3272} 3273 3274/// \brief Diagnose function specifiers on a declaration of an identifier that 3275/// does not identify a function. 3276void Sema::DiagnoseFunctionSpecifiers(Declarator& D) { 3277 // FIXME: We should probably indicate the identifier in question to avoid 3278 // confusion for constructs like "inline int a(), b;" 3279 if (D.getDeclSpec().isInlineSpecified()) 3280 Diag(D.getDeclSpec().getInlineSpecLoc(), 3281 diag::err_inline_non_function); 3282 3283 if (D.getDeclSpec().isVirtualSpecified()) 3284 Diag(D.getDeclSpec().getVirtualSpecLoc(), 3285 diag::err_virtual_non_function); 3286 3287 if (D.getDeclSpec().isExplicitSpecified()) 3288 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3289 diag::err_explicit_non_function); 3290} 3291 3292NamedDecl* 3293Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 3294 QualType R, TypeSourceInfo *TInfo, 3295 LookupResult &Previous, bool &Redeclaration) { 3296 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 3297 if (D.getCXXScopeSpec().isSet()) { 3298 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 3299 << D.getCXXScopeSpec().getRange(); 3300 D.setInvalidType(); 3301 // Pretend we didn't see the scope specifier. 3302 DC = CurContext; 3303 Previous.clear(); 3304 } 3305 3306 if (getLangOptions().CPlusPlus) { 3307 // Check that there are no default arguments (C++ only). 3308 CheckExtraCXXDefaultArguments(D); 3309 } 3310 3311 DiagnoseFunctionSpecifiers(D); 3312 3313 if (D.getDeclSpec().isThreadSpecified()) 3314 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 3315 3316 if (D.getName().Kind != UnqualifiedId::IK_Identifier) { 3317 Diag(D.getName().StartLocation, diag::err_typedef_not_identifier) 3318 << D.getName().getSourceRange(); 3319 return 0; 3320 } 3321 3322 TypedefDecl *NewTD = ParseTypedefDecl(S, D, R, TInfo); 3323 if (!NewTD) return 0; 3324 3325 // Handle attributes prior to checking for duplicates in MergeVarDecl 3326 ProcessDeclAttributes(S, NewTD, D); 3327 3328 CheckTypedefForVariablyModifiedType(S, NewTD); 3329 3330 return ActOnTypedefNameDecl(S, DC, NewTD, Previous, Redeclaration); 3331} 3332 3333void 3334Sema::CheckTypedefForVariablyModifiedType(Scope *S, TypedefNameDecl *NewTD) { 3335 // C99 6.7.7p2: If a typedef name specifies a variably modified type 3336 // then it shall have block scope. 3337 // Note that variably modified types must be fixed before merging the decl so 3338 // that redeclarations will match. 3339 QualType T = NewTD->getUnderlyingType(); 3340 if (T->isVariablyModifiedType()) { 3341 getCurFunction()->setHasBranchProtectedScope(); 3342 3343 if (S->getFnParent() == 0) { 3344 bool SizeIsNegative; 3345 llvm::APSInt Oversized; 3346 QualType FixedTy = 3347 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 3348 Oversized); 3349 if (!FixedTy.isNull()) { 3350 Diag(NewTD->getLocation(), diag::warn_illegal_constant_array_size); 3351 NewTD->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(FixedTy)); 3352 } else { 3353 if (SizeIsNegative) 3354 Diag(NewTD->getLocation(), diag::err_typecheck_negative_array_size); 3355 else if (T->isVariableArrayType()) 3356 Diag(NewTD->getLocation(), diag::err_vla_decl_in_file_scope); 3357 else if (Oversized.getBoolValue()) 3358 Diag(NewTD->getLocation(), diag::err_array_too_large) << Oversized.toString(10); 3359 else 3360 Diag(NewTD->getLocation(), diag::err_vm_decl_in_file_scope); 3361 NewTD->setInvalidDecl(); 3362 } 3363 } 3364 } 3365} 3366 3367 3368/// ActOnTypedefNameDecl - Perform semantic checking for a declaration which 3369/// declares a typedef-name, either using the 'typedef' type specifier or via 3370/// a C++0x [dcl.typedef]p2 alias-declaration: 'using T = A;'. 3371NamedDecl* 3372Sema::ActOnTypedefNameDecl(Scope *S, DeclContext *DC, TypedefNameDecl *NewTD, 3373 LookupResult &Previous, bool &Redeclaration) { 3374 // Merge the decl with the existing one if appropriate. If the decl is 3375 // in an outer scope, it isn't the same thing. 3376 FilterLookupForScope(Previous, DC, S, /*ConsiderLinkage*/ false, 3377 /*ExplicitInstantiationOrSpecialization=*/false); 3378 if (!Previous.empty()) { 3379 Redeclaration = true; 3380 MergeTypedefNameDecl(NewTD, Previous); 3381 } 3382 3383 // If this is the C FILE type, notify the AST context. 3384 if (IdentifierInfo *II = NewTD->getIdentifier()) 3385 if (!NewTD->isInvalidDecl() && 3386 NewTD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 3387 if (II->isStr("FILE")) 3388 Context.setFILEDecl(NewTD); 3389 else if (II->isStr("jmp_buf")) 3390 Context.setjmp_bufDecl(NewTD); 3391 else if (II->isStr("sigjmp_buf")) 3392 Context.setsigjmp_bufDecl(NewTD); 3393 else if (II->isStr("__builtin_va_list")) 3394 Context.setBuiltinVaListType(Context.getTypedefType(NewTD)); 3395 } 3396 3397 return NewTD; 3398} 3399 3400/// \brief Determines whether the given declaration is an out-of-scope 3401/// previous declaration. 3402/// 3403/// This routine should be invoked when name lookup has found a 3404/// previous declaration (PrevDecl) that is not in the scope where a 3405/// new declaration by the same name is being introduced. If the new 3406/// declaration occurs in a local scope, previous declarations with 3407/// linkage may still be considered previous declarations (C99 3408/// 6.2.2p4-5, C++ [basic.link]p6). 3409/// 3410/// \param PrevDecl the previous declaration found by name 3411/// lookup 3412/// 3413/// \param DC the context in which the new declaration is being 3414/// declared. 3415/// 3416/// \returns true if PrevDecl is an out-of-scope previous declaration 3417/// for a new delcaration with the same name. 3418static bool 3419isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 3420 ASTContext &Context) { 3421 if (!PrevDecl) 3422 return false; 3423 3424 if (!PrevDecl->hasLinkage()) 3425 return false; 3426 3427 if (Context.getLangOptions().CPlusPlus) { 3428 // C++ [basic.link]p6: 3429 // If there is a visible declaration of an entity with linkage 3430 // having the same name and type, ignoring entities declared 3431 // outside the innermost enclosing namespace scope, the block 3432 // scope declaration declares that same entity and receives the 3433 // linkage of the previous declaration. 3434 DeclContext *OuterContext = DC->getRedeclContext(); 3435 if (!OuterContext->isFunctionOrMethod()) 3436 // This rule only applies to block-scope declarations. 3437 return false; 3438 3439 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 3440 if (PrevOuterContext->isRecord()) 3441 // We found a member function: ignore it. 3442 return false; 3443 3444 // Find the innermost enclosing namespace for the new and 3445 // previous declarations. 3446 OuterContext = OuterContext->getEnclosingNamespaceContext(); 3447 PrevOuterContext = PrevOuterContext->getEnclosingNamespaceContext(); 3448 3449 // The previous declaration is in a different namespace, so it 3450 // isn't the same function. 3451 if (!OuterContext->Equals(PrevOuterContext)) 3452 return false; 3453 } 3454 3455 return true; 3456} 3457 3458static void SetNestedNameSpecifier(DeclaratorDecl *DD, Declarator &D) { 3459 CXXScopeSpec &SS = D.getCXXScopeSpec(); 3460 if (!SS.isSet()) return; 3461 DD->setQualifierInfo(SS.getWithLocInContext(DD->getASTContext())); 3462} 3463 3464NamedDecl* 3465Sema::ActOnVariableDeclarator(Scope *S, Declarator &D, DeclContext *DC, 3466 QualType R, TypeSourceInfo *TInfo, 3467 LookupResult &Previous, 3468 MultiTemplateParamsArg TemplateParamLists, 3469 bool &Redeclaration) { 3470 DeclarationName Name = GetNameForDeclarator(D).getName(); 3471 3472 // Check that there are no default arguments (C++ only). 3473 if (getLangOptions().CPlusPlus) 3474 CheckExtraCXXDefaultArguments(D); 3475 3476 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpec(); 3477 assert(SCSpec != DeclSpec::SCS_typedef && 3478 "Parser allowed 'typedef' as storage class VarDecl."); 3479 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 3480 if (SCSpec == DeclSpec::SCS_mutable) { 3481 // mutable can only appear on non-static class members, so it's always 3482 // an error here 3483 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 3484 D.setInvalidType(); 3485 SC = SC_None; 3486 } 3487 SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 3488 VarDecl::StorageClass SCAsWritten 3489 = StorageClassSpecToVarDeclStorageClass(SCSpec); 3490 3491 IdentifierInfo *II = Name.getAsIdentifierInfo(); 3492 if (!II) { 3493 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 3494 << Name.getAsString(); 3495 return 0; 3496 } 3497 3498 DiagnoseFunctionSpecifiers(D); 3499 3500 if (!DC->isRecord() && S->getFnParent() == 0) { 3501 // C99 6.9p2: The storage-class specifiers auto and register shall not 3502 // appear in the declaration specifiers in an external declaration. 3503 if (SC == SC_Auto || SC == SC_Register) { 3504 3505 // If this is a register variable with an asm label specified, then this 3506 // is a GNU extension. 3507 if (SC == SC_Register && D.getAsmLabel()) 3508 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register); 3509 else 3510 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 3511 D.setInvalidType(); 3512 } 3513 } 3514 3515 bool isExplicitSpecialization = false; 3516 VarDecl *NewVD; 3517 if (!getLangOptions().CPlusPlus) { 3518 NewVD = VarDecl::Create(Context, DC, D.getSourceRange().getBegin(), 3519 D.getIdentifierLoc(), II, 3520 R, TInfo, SC, SCAsWritten); 3521 3522 if (D.isInvalidType()) 3523 NewVD->setInvalidDecl(); 3524 } else { 3525 if (DC->isRecord() && !CurContext->isRecord()) { 3526 // This is an out-of-line definition of a static data member. 3527 if (SC == SC_Static) { 3528 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 3529 diag::err_static_out_of_line) 3530 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3531 } else if (SC == SC_None) 3532 SC = SC_Static; 3533 } 3534 if (SC == SC_Static) { 3535 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) { 3536 if (RD->isLocalClass()) 3537 Diag(D.getIdentifierLoc(), 3538 diag::err_static_data_member_not_allowed_in_local_class) 3539 << Name << RD->getDeclName(); 3540 3541 // C++ [class.union]p1: If a union contains a static data member, 3542 // the program is ill-formed. 3543 // 3544 // We also disallow static data members in anonymous structs. 3545 if (CurContext->isRecord() && (RD->isUnion() || !RD->getDeclName())) 3546 Diag(D.getIdentifierLoc(), 3547 diag::err_static_data_member_not_allowed_in_union_or_anon_struct) 3548 << Name << RD->isUnion(); 3549 } 3550 } 3551 3552 // Match up the template parameter lists with the scope specifier, then 3553 // determine whether we have a template or a template specialization. 3554 isExplicitSpecialization = false; 3555 bool Invalid = false; 3556 if (TemplateParameterList *TemplateParams 3557 = MatchTemplateParametersToScopeSpecifier( 3558 D.getDeclSpec().getSourceRange().getBegin(), 3559 D.getIdentifierLoc(), 3560 D.getCXXScopeSpec(), 3561 TemplateParamLists.get(), 3562 TemplateParamLists.size(), 3563 /*never a friend*/ false, 3564 isExplicitSpecialization, 3565 Invalid)) { 3566 if (TemplateParams->size() > 0) { 3567 // There is no such thing as a variable template. 3568 Diag(D.getIdentifierLoc(), diag::err_template_variable) 3569 << II 3570 << SourceRange(TemplateParams->getTemplateLoc(), 3571 TemplateParams->getRAngleLoc()); 3572 return 0; 3573 } else { 3574 // There is an extraneous 'template<>' for this variable. Complain 3575 // about it, but allow the declaration of the variable. 3576 Diag(TemplateParams->getTemplateLoc(), 3577 diag::err_template_variable_noparams) 3578 << II 3579 << SourceRange(TemplateParams->getTemplateLoc(), 3580 TemplateParams->getRAngleLoc()); 3581 } 3582 } 3583 3584 NewVD = VarDecl::Create(Context, DC, D.getSourceRange().getBegin(), 3585 D.getIdentifierLoc(), II, 3586 R, TInfo, SC, SCAsWritten); 3587 3588 // If this decl has an auto type in need of deduction, make a note of the 3589 // Decl so we can diagnose uses of it in its own initializer. 3590 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto && 3591 R->getContainedAutoType()) 3592 ParsingInitForAutoVars.insert(NewVD); 3593 3594 if (D.isInvalidType() || Invalid) 3595 NewVD->setInvalidDecl(); 3596 3597 SetNestedNameSpecifier(NewVD, D); 3598 3599 if (TemplateParamLists.size() > 0 && D.getCXXScopeSpec().isSet()) { 3600 NewVD->setTemplateParameterListsInfo(Context, 3601 TemplateParamLists.size(), 3602 TemplateParamLists.release()); 3603 } 3604 } 3605 3606 if (D.getDeclSpec().isThreadSpecified()) { 3607 if (NewVD->hasLocalStorage()) 3608 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global); 3609 else if (!Context.Target.isTLSSupported()) 3610 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported); 3611 else 3612 NewVD->setThreadSpecified(true); 3613 } 3614 3615 // Set the lexical context. If the declarator has a C++ scope specifier, the 3616 // lexical context will be different from the semantic context. 3617 NewVD->setLexicalDeclContext(CurContext); 3618 3619 // Handle attributes prior to checking for duplicates in MergeVarDecl 3620 ProcessDeclAttributes(S, NewVD, D); 3621 3622 // Handle GNU asm-label extension (encoded as an attribute). 3623 if (Expr *E = (Expr*)D.getAsmLabel()) { 3624 // The parser guarantees this is a string. 3625 StringLiteral *SE = cast<StringLiteral>(E); 3626 llvm::StringRef Label = SE->getString(); 3627 if (S->getFnParent() != 0) { 3628 switch (SC) { 3629 case SC_None: 3630 case SC_Auto: 3631 Diag(E->getExprLoc(), diag::warn_asm_label_on_auto_decl) << Label; 3632 break; 3633 case SC_Register: 3634 if (!Context.Target.isValidGCCRegisterName(Label)) 3635 Diag(E->getExprLoc(), diag::err_asm_unknown_register_name) << Label; 3636 break; 3637 case SC_Static: 3638 case SC_Extern: 3639 case SC_PrivateExtern: 3640 break; 3641 } 3642 } 3643 3644 NewVD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), 3645 Context, Label)); 3646 } 3647 3648 // Diagnose shadowed variables before filtering for scope. 3649 if (!D.getCXXScopeSpec().isSet()) 3650 CheckShadow(S, NewVD, Previous); 3651 3652 // Don't consider existing declarations that are in a different 3653 // scope and are out-of-semantic-context declarations (if the new 3654 // declaration has linkage). 3655 FilterLookupForScope(Previous, DC, S, NewVD->hasLinkage(), 3656 isExplicitSpecialization); 3657 3658 if (!getLangOptions().CPlusPlus) 3659 CheckVariableDeclaration(NewVD, Previous, Redeclaration); 3660 else { 3661 // Merge the decl with the existing one if appropriate. 3662 if (!Previous.empty()) { 3663 if (Previous.isSingleResult() && 3664 isa<FieldDecl>(Previous.getFoundDecl()) && 3665 D.getCXXScopeSpec().isSet()) { 3666 // The user tried to define a non-static data member 3667 // out-of-line (C++ [dcl.meaning]p1). 3668 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 3669 << D.getCXXScopeSpec().getRange(); 3670 Previous.clear(); 3671 NewVD->setInvalidDecl(); 3672 } 3673 } else if (D.getCXXScopeSpec().isSet()) { 3674 // No previous declaration in the qualifying scope. 3675 Diag(D.getIdentifierLoc(), diag::err_no_member) 3676 << Name << computeDeclContext(D.getCXXScopeSpec(), true) 3677 << D.getCXXScopeSpec().getRange(); 3678 NewVD->setInvalidDecl(); 3679 } 3680 3681 CheckVariableDeclaration(NewVD, Previous, Redeclaration); 3682 3683 // This is an explicit specialization of a static data member. Check it. 3684 if (isExplicitSpecialization && !NewVD->isInvalidDecl() && 3685 CheckMemberSpecialization(NewVD, Previous)) 3686 NewVD->setInvalidDecl(); 3687 } 3688 3689 // attributes declared post-definition are currently ignored 3690 // FIXME: This should be handled in attribute merging, not 3691 // here. 3692 if (Previous.isSingleResult()) { 3693 VarDecl *Def = dyn_cast<VarDecl>(Previous.getFoundDecl()); 3694 if (Def && (Def = Def->getDefinition()) && 3695 Def != NewVD && D.hasAttributes()) { 3696 Diag(NewVD->getLocation(), diag::warn_attribute_precede_definition); 3697 Diag(Def->getLocation(), diag::note_previous_definition); 3698 } 3699 } 3700 3701 // If this is a locally-scoped extern C variable, update the map of 3702 // such variables. 3703 if (CurContext->isFunctionOrMethod() && NewVD->isExternC() && 3704 !NewVD->isInvalidDecl()) 3705 RegisterLocallyScopedExternCDecl(NewVD, Previous, S); 3706 3707 // If there's a #pragma GCC visibility in scope, and this isn't a class 3708 // member, set the visibility of this variable. 3709 if (NewVD->getLinkage() == ExternalLinkage && !DC->isRecord()) 3710 AddPushedVisibilityAttribute(NewVD); 3711 3712 MarkUnusedFileScopedDecl(NewVD); 3713 3714 return NewVD; 3715} 3716 3717/// \brief Diagnose variable or built-in function shadowing. Implements 3718/// -Wshadow. 3719/// 3720/// This method is called whenever a VarDecl is added to a "useful" 3721/// scope. 3722/// 3723/// \param S the scope in which the shadowing name is being declared 3724/// \param R the lookup of the name 3725/// 3726void Sema::CheckShadow(Scope *S, VarDecl *D, const LookupResult& R) { 3727 // Return if warning is ignored. 3728 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, R.getNameLoc()) == 3729 Diagnostic::Ignored) 3730 return; 3731 3732 // Don't diagnose declarations at file scope. 3733 if (D->hasGlobalStorage()) 3734 return; 3735 3736 DeclContext *NewDC = D->getDeclContext(); 3737 3738 // Only diagnose if we're shadowing an unambiguous field or variable. 3739 if (R.getResultKind() != LookupResult::Found) 3740 return; 3741 3742 NamedDecl* ShadowedDecl = R.getFoundDecl(); 3743 if (!isa<VarDecl>(ShadowedDecl) && !isa<FieldDecl>(ShadowedDecl)) 3744 return; 3745 3746 // Fields are not shadowed by variables in C++ static methods. 3747 if (isa<FieldDecl>(ShadowedDecl)) 3748 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewDC)) 3749 if (MD->isStatic()) 3750 return; 3751 3752 if (VarDecl *shadowedVar = dyn_cast<VarDecl>(ShadowedDecl)) 3753 if (shadowedVar->isExternC()) { 3754 // For shadowing external vars, make sure that we point to the global 3755 // declaration, not a locally scoped extern declaration. 3756 for (VarDecl::redecl_iterator 3757 I = shadowedVar->redecls_begin(), E = shadowedVar->redecls_end(); 3758 I != E; ++I) 3759 if (I->isFileVarDecl()) { 3760 ShadowedDecl = *I; 3761 break; 3762 } 3763 } 3764 3765 DeclContext *OldDC = ShadowedDecl->getDeclContext(); 3766 3767 // Only warn about certain kinds of shadowing for class members. 3768 if (NewDC && NewDC->isRecord()) { 3769 // In particular, don't warn about shadowing non-class members. 3770 if (!OldDC->isRecord()) 3771 return; 3772 3773 // TODO: should we warn about static data members shadowing 3774 // static data members from base classes? 3775 3776 // TODO: don't diagnose for inaccessible shadowed members. 3777 // This is hard to do perfectly because we might friend the 3778 // shadowing context, but that's just a false negative. 3779 } 3780 3781 // Determine what kind of declaration we're shadowing. 3782 unsigned Kind; 3783 if (isa<RecordDecl>(OldDC)) { 3784 if (isa<FieldDecl>(ShadowedDecl)) 3785 Kind = 3; // field 3786 else 3787 Kind = 2; // static data member 3788 } else if (OldDC->isFileContext()) 3789 Kind = 1; // global 3790 else 3791 Kind = 0; // local 3792 3793 DeclarationName Name = R.getLookupName(); 3794 3795 // Emit warning and note. 3796 Diag(R.getNameLoc(), diag::warn_decl_shadow) << Name << Kind << OldDC; 3797 Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration); 3798} 3799 3800/// \brief Check -Wshadow without the advantage of a previous lookup. 3801void Sema::CheckShadow(Scope *S, VarDecl *D) { 3802 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, D->getLocation()) == 3803 Diagnostic::Ignored) 3804 return; 3805 3806 LookupResult R(*this, D->getDeclName(), D->getLocation(), 3807 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 3808 LookupName(R, S); 3809 CheckShadow(S, D, R); 3810} 3811 3812/// \brief Perform semantic checking on a newly-created variable 3813/// declaration. 3814/// 3815/// This routine performs all of the type-checking required for a 3816/// variable declaration once it has been built. It is used both to 3817/// check variables after they have been parsed and their declarators 3818/// have been translated into a declaration, and to check variables 3819/// that have been instantiated from a template. 3820/// 3821/// Sets NewVD->isInvalidDecl() if an error was encountered. 3822void Sema::CheckVariableDeclaration(VarDecl *NewVD, 3823 LookupResult &Previous, 3824 bool &Redeclaration) { 3825 // If the decl is already known invalid, don't check it. 3826 if (NewVD->isInvalidDecl()) 3827 return; 3828 3829 QualType T = NewVD->getType(); 3830 3831 if (T->isObjCObjectType()) { 3832 Diag(NewVD->getLocation(), diag::err_statically_allocated_object); 3833 return NewVD->setInvalidDecl(); 3834 } 3835 3836 // Emit an error if an address space was applied to decl with local storage. 3837 // This includes arrays of objects with address space qualifiers, but not 3838 // automatic variables that point to other address spaces. 3839 // ISO/IEC TR 18037 S5.1.2 3840 if (NewVD->hasLocalStorage() && T.getAddressSpace() != 0) { 3841 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 3842 return NewVD->setInvalidDecl(); 3843 } 3844 3845 if (NewVD->hasLocalStorage() && T.isObjCGCWeak() 3846 && !NewVD->hasAttr<BlocksAttr>()) 3847 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 3848 3849 bool isVM = T->isVariablyModifiedType(); 3850 if (isVM || NewVD->hasAttr<CleanupAttr>() || 3851 NewVD->hasAttr<BlocksAttr>()) 3852 getCurFunction()->setHasBranchProtectedScope(); 3853 3854 if ((isVM && NewVD->hasLinkage()) || 3855 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { 3856 bool SizeIsNegative; 3857 llvm::APSInt Oversized; 3858 QualType FixedTy = 3859 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 3860 Oversized); 3861 3862 if (FixedTy.isNull() && T->isVariableArrayType()) { 3863 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 3864 // FIXME: This won't give the correct result for 3865 // int a[10][n]; 3866 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 3867 3868 if (NewVD->isFileVarDecl()) 3869 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 3870 << SizeRange; 3871 else if (NewVD->getStorageClass() == SC_Static) 3872 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 3873 << SizeRange; 3874 else 3875 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 3876 << SizeRange; 3877 return NewVD->setInvalidDecl(); 3878 } 3879 3880 if (FixedTy.isNull()) { 3881 if (NewVD->isFileVarDecl()) 3882 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 3883 else 3884 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 3885 return NewVD->setInvalidDecl(); 3886 } 3887 3888 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 3889 NewVD->setType(FixedTy); 3890 } 3891 3892 if (Previous.empty() && NewVD->isExternC()) { 3893 // Since we did not find anything by this name and we're declaring 3894 // an extern "C" variable, look for a non-visible extern "C" 3895 // declaration with the same name. 3896 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3897 = LocallyScopedExternalDecls.find(NewVD->getDeclName()); 3898 if (Pos != LocallyScopedExternalDecls.end()) 3899 Previous.addDecl(Pos->second); 3900 } 3901 3902 if (T->isVoidType() && !NewVD->hasExternalStorage()) { 3903 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 3904 << T; 3905 return NewVD->setInvalidDecl(); 3906 } 3907 3908 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { 3909 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); 3910 return NewVD->setInvalidDecl(); 3911 } 3912 3913 if (isVM && NewVD->hasAttr<BlocksAttr>()) { 3914 Diag(NewVD->getLocation(), diag::err_block_on_vm); 3915 return NewVD->setInvalidDecl(); 3916 } 3917 3918 // Function pointers and references cannot have qualified function type, only 3919 // function pointer-to-members can do that. 3920 QualType Pointee; 3921 unsigned PtrOrRef = 0; 3922 if (const PointerType *Ptr = T->getAs<PointerType>()) 3923 Pointee = Ptr->getPointeeType(); 3924 else if (const ReferenceType *Ref = T->getAs<ReferenceType>()) { 3925 Pointee = Ref->getPointeeType(); 3926 PtrOrRef = 1; 3927 } 3928 if (!Pointee.isNull() && Pointee->isFunctionProtoType() && 3929 Pointee->getAs<FunctionProtoType>()->getTypeQuals() != 0) { 3930 Diag(NewVD->getLocation(), diag::err_invalid_qualified_function_pointer) 3931 << PtrOrRef; 3932 return NewVD->setInvalidDecl(); 3933 } 3934 3935 if (!Previous.empty()) { 3936 Redeclaration = true; 3937 MergeVarDecl(NewVD, Previous); 3938 } 3939} 3940 3941/// \brief Data used with FindOverriddenMethod 3942struct FindOverriddenMethodData { 3943 Sema *S; 3944 CXXMethodDecl *Method; 3945}; 3946 3947/// \brief Member lookup function that determines whether a given C++ 3948/// method overrides a method in a base class, to be used with 3949/// CXXRecordDecl::lookupInBases(). 3950static bool FindOverriddenMethod(const CXXBaseSpecifier *Specifier, 3951 CXXBasePath &Path, 3952 void *UserData) { 3953 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 3954 3955 FindOverriddenMethodData *Data 3956 = reinterpret_cast<FindOverriddenMethodData*>(UserData); 3957 3958 DeclarationName Name = Data->Method->getDeclName(); 3959 3960 // FIXME: Do we care about other names here too? 3961 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 3962 // We really want to find the base class destructor here. 3963 QualType T = Data->S->Context.getTypeDeclType(BaseRecord); 3964 CanQualType CT = Data->S->Context.getCanonicalType(T); 3965 3966 Name = Data->S->Context.DeclarationNames.getCXXDestructorName(CT); 3967 } 3968 3969 for (Path.Decls = BaseRecord->lookup(Name); 3970 Path.Decls.first != Path.Decls.second; 3971 ++Path.Decls.first) { 3972 NamedDecl *D = *Path.Decls.first; 3973 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 3974 if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD, false)) 3975 return true; 3976 } 3977 } 3978 3979 return false; 3980} 3981 3982/// AddOverriddenMethods - See if a method overrides any in the base classes, 3983/// and if so, check that it's a valid override and remember it. 3984bool Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 3985 // Look for virtual methods in base classes that this method might override. 3986 CXXBasePaths Paths; 3987 FindOverriddenMethodData Data; 3988 Data.Method = MD; 3989 Data.S = this; 3990 bool AddedAny = false; 3991 if (DC->lookupInBases(&FindOverriddenMethod, &Data, Paths)) { 3992 for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(), 3993 E = Paths.found_decls_end(); I != E; ++I) { 3994 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) { 3995 if (!CheckOverridingFunctionReturnType(MD, OldMD) && 3996 !CheckOverridingFunctionExceptionSpec(MD, OldMD) && 3997 !CheckIfOverriddenFunctionIsMarkedFinal(MD, OldMD)) { 3998 MD->addOverriddenMethod(OldMD->getCanonicalDecl()); 3999 AddedAny = true; 4000 } 4001 } 4002 } 4003 } 4004 4005 return AddedAny; 4006} 4007 4008static void DiagnoseInvalidRedeclaration(Sema &S, FunctionDecl *NewFD) { 4009 LookupResult Prev(S, NewFD->getDeclName(), NewFD->getLocation(), 4010 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4011 S.LookupQualifiedName(Prev, NewFD->getDeclContext()); 4012 assert(!Prev.isAmbiguous() && 4013 "Cannot have an ambiguity in previous-declaration lookup"); 4014 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 4015 Func != FuncEnd; ++Func) { 4016 if (isa<FunctionDecl>(*Func) && 4017 isNearlyMatchingFunction(S.Context, cast<FunctionDecl>(*Func), NewFD)) 4018 S.Diag((*Func)->getLocation(), diag::note_member_def_close_match); 4019 } 4020} 4021 4022NamedDecl* 4023Sema::ActOnFunctionDeclarator(Scope* S, Declarator& D, DeclContext* DC, 4024 QualType R, TypeSourceInfo *TInfo, 4025 LookupResult &Previous, 4026 MultiTemplateParamsArg TemplateParamLists, 4027 bool IsFunctionDefinition, bool &Redeclaration) { 4028 assert(R.getTypePtr()->isFunctionType()); 4029 4030 // TODO: consider using NameInfo for diagnostic. 4031 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 4032 DeclarationName Name = NameInfo.getName(); 4033 FunctionDecl::StorageClass SC = SC_None; 4034 switch (D.getDeclSpec().getStorageClassSpec()) { 4035 default: assert(0 && "Unknown storage class!"); 4036 case DeclSpec::SCS_auto: 4037 case DeclSpec::SCS_register: 4038 case DeclSpec::SCS_mutable: 4039 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4040 diag::err_typecheck_sclass_func); 4041 D.setInvalidType(); 4042 break; 4043 case DeclSpec::SCS_unspecified: SC = SC_None; break; 4044 case DeclSpec::SCS_extern: SC = SC_Extern; break; 4045 case DeclSpec::SCS_static: { 4046 if (CurContext->getRedeclContext()->isFunctionOrMethod()) { 4047 // C99 6.7.1p5: 4048 // The declaration of an identifier for a function that has 4049 // block scope shall have no explicit storage-class specifier 4050 // other than extern 4051 // See also (C++ [dcl.stc]p4). 4052 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4053 diag::err_static_block_func); 4054 SC = SC_None; 4055 } else 4056 SC = SC_Static; 4057 break; 4058 } 4059 case DeclSpec::SCS_private_extern: SC = SC_PrivateExtern; break; 4060 } 4061 4062 if (D.getDeclSpec().isThreadSpecified()) 4063 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 4064 4065 // Do not allow returning a objc interface by-value. 4066 if (R->getAs<FunctionType>()->getResultType()->isObjCObjectType()) { 4067 Diag(D.getIdentifierLoc(), 4068 diag::err_object_cannot_be_passed_returned_by_value) << 0 4069 << R->getAs<FunctionType>()->getResultType(); 4070 D.setInvalidType(); 4071 } 4072 4073 FunctionDecl *NewFD; 4074 bool isInline = D.getDeclSpec().isInlineSpecified(); 4075 bool isFriend = false; 4076 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 4077 FunctionDecl::StorageClass SCAsWritten 4078 = StorageClassSpecToFunctionDeclStorageClass(SCSpec); 4079 FunctionTemplateDecl *FunctionTemplate = 0; 4080 bool isExplicitSpecialization = false; 4081 bool isFunctionTemplateSpecialization = false; 4082 4083 if (!getLangOptions().CPlusPlus) { 4084 // Determine whether the function was written with a 4085 // prototype. This true when: 4086 // - there is a prototype in the declarator, or 4087 // - the type R of the function is some kind of typedef or other reference 4088 // to a type name (which eventually refers to a function type). 4089 bool HasPrototype = 4090 (D.isFunctionDeclarator() && D.getFunctionTypeInfo().hasPrototype) || 4091 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 4092 4093 NewFD = FunctionDecl::Create(Context, DC, D.getSourceRange().getBegin(), 4094 NameInfo, R, TInfo, SC, SCAsWritten, isInline, 4095 HasPrototype); 4096 if (D.isInvalidType()) 4097 NewFD->setInvalidDecl(); 4098 4099 // Set the lexical context. 4100 NewFD->setLexicalDeclContext(CurContext); 4101 // Filter out previous declarations that don't match the scope. 4102 FilterLookupForScope(Previous, DC, S, NewFD->hasLinkage(), 4103 /*ExplicitInstantiationOrSpecialization=*/false); 4104 } else { 4105 isFriend = D.getDeclSpec().isFriendSpecified(); 4106 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 4107 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 4108 bool isVirtualOkay = false; 4109 4110 // Check that the return type is not an abstract class type. 4111 // For record types, this is done by the AbstractClassUsageDiagnoser once 4112 // the class has been completely parsed. 4113 if (!DC->isRecord() && 4114 RequireNonAbstractType(D.getIdentifierLoc(), 4115 R->getAs<FunctionType>()->getResultType(), 4116 diag::err_abstract_type_in_decl, 4117 AbstractReturnType)) 4118 D.setInvalidType(); 4119 4120 if (Name.getNameKind() == DeclarationName::CXXConstructorName) { 4121 // This is a C++ constructor declaration. 4122 assert(DC->isRecord() && 4123 "Constructors can only be declared in a member context"); 4124 4125 R = CheckConstructorDeclarator(D, R, SC); 4126 4127 // Create the new declaration 4128 CXXConstructorDecl *NewCD = CXXConstructorDecl::Create( 4129 Context, 4130 cast<CXXRecordDecl>(DC), 4131 D.getSourceRange().getBegin(), 4132 NameInfo, R, TInfo, 4133 isExplicit, isInline, 4134 /*isImplicitlyDeclared=*/false); 4135 4136 NewFD = NewCD; 4137 } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4138 // This is a C++ destructor declaration. 4139 if (DC->isRecord()) { 4140 R = CheckDestructorDeclarator(D, R, SC); 4141 4142 NewFD = CXXDestructorDecl::Create(Context, 4143 cast<CXXRecordDecl>(DC), 4144 D.getSourceRange().getBegin(), 4145 NameInfo, R, TInfo, 4146 isInline, 4147 /*isImplicitlyDeclared=*/false); 4148 isVirtualOkay = true; 4149 } else { 4150 Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 4151 4152 // Create a FunctionDecl to satisfy the function definition parsing 4153 // code path. 4154 NewFD = FunctionDecl::Create(Context, DC, D.getSourceRange().getBegin(), 4155 D.getIdentifierLoc(), Name, R, TInfo, 4156 SC, SCAsWritten, isInline, 4157 /*hasPrototype=*/true); 4158 D.setInvalidType(); 4159 } 4160 } else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) { 4161 if (!DC->isRecord()) { 4162 Diag(D.getIdentifierLoc(), 4163 diag::err_conv_function_not_member); 4164 return 0; 4165 } 4166 4167 CheckConversionDeclarator(D, R, SC); 4168 NewFD = CXXConversionDecl::Create(Context, cast<CXXRecordDecl>(DC), 4169 D.getSourceRange().getBegin(), 4170 NameInfo, R, TInfo, 4171 isInline, isExplicit, 4172 SourceLocation()); 4173 4174 isVirtualOkay = true; 4175 } else if (DC->isRecord()) { 4176 // If the of the function is the same as the name of the record, then this 4177 // must be an invalid constructor that has a return type. 4178 // (The parser checks for a return type and makes the declarator a 4179 // constructor if it has no return type). 4180 // must have an invalid constructor that has a return type 4181 if (Name.getAsIdentifierInfo() && 4182 Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ 4183 Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 4184 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 4185 << SourceRange(D.getIdentifierLoc()); 4186 return 0; 4187 } 4188 4189 bool isStatic = SC == SC_Static; 4190 4191 // [class.free]p1: 4192 // Any allocation function for a class T is a static member 4193 // (even if not explicitly declared static). 4194 if (Name.getCXXOverloadedOperator() == OO_New || 4195 Name.getCXXOverloadedOperator() == OO_Array_New) 4196 isStatic = true; 4197 4198 // [class.free]p6 Any deallocation function for a class X is a static member 4199 // (even if not explicitly declared static). 4200 if (Name.getCXXOverloadedOperator() == OO_Delete || 4201 Name.getCXXOverloadedOperator() == OO_Array_Delete) 4202 isStatic = true; 4203 4204 // This is a C++ method declaration. 4205 CXXMethodDecl *NewMD = CXXMethodDecl::Create( 4206 Context, cast<CXXRecordDecl>(DC), 4207 D.getSourceRange().getBegin(), 4208 NameInfo, R, TInfo, 4209 isStatic, SCAsWritten, isInline, 4210 SourceLocation()); 4211 NewFD = NewMD; 4212 4213 isVirtualOkay = !isStatic; 4214 } else { 4215 // Determine whether the function was written with a 4216 // prototype. This true when: 4217 // - we're in C++ (where every function has a prototype), 4218 NewFD = FunctionDecl::Create(Context, DC, D.getSourceRange().getBegin(), 4219 NameInfo, R, TInfo, SC, SCAsWritten, isInline, 4220 true/*HasPrototype*/); 4221 } 4222 4223 if (isFriend && !isInline && IsFunctionDefinition) { 4224 // C++ [class.friend]p5 4225 // A function can be defined in a friend declaration of a 4226 // class . . . . Such a function is implicitly inline. 4227 NewFD->setImplicitlyInline(); 4228 } 4229 4230 SetNestedNameSpecifier(NewFD, D); 4231 isExplicitSpecialization = false; 4232 isFunctionTemplateSpecialization = false; 4233 if (D.isInvalidType()) 4234 NewFD->setInvalidDecl(); 4235 4236 // Set the lexical context. If the declarator has a C++ 4237 // scope specifier, or is the object of a friend declaration, the 4238 // lexical context will be different from the semantic context. 4239 NewFD->setLexicalDeclContext(CurContext); 4240 4241 // Match up the template parameter lists with the scope specifier, then 4242 // determine whether we have a template or a template specialization. 4243 bool Invalid = false; 4244 if (TemplateParameterList *TemplateParams 4245 = MatchTemplateParametersToScopeSpecifier( 4246 D.getDeclSpec().getSourceRange().getBegin(), 4247 D.getIdentifierLoc(), 4248 D.getCXXScopeSpec(), 4249 TemplateParamLists.get(), 4250 TemplateParamLists.size(), 4251 isFriend, 4252 isExplicitSpecialization, 4253 Invalid)) { 4254 if (TemplateParams->size() > 0) { 4255 // This is a function template 4256 4257 // Check that we can declare a template here. 4258 if (CheckTemplateDeclScope(S, TemplateParams)) 4259 return 0; 4260 4261 // A destructor cannot be a template. 4262 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4263 Diag(NewFD->getLocation(), diag::err_destructor_template); 4264 return 0; 4265 } 4266 4267 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC, 4268 NewFD->getLocation(), 4269 Name, TemplateParams, 4270 NewFD); 4271 FunctionTemplate->setLexicalDeclContext(CurContext); 4272 NewFD->setDescribedFunctionTemplate(FunctionTemplate); 4273 4274 // For source fidelity, store the other template param lists. 4275 if (TemplateParamLists.size() > 1) { 4276 NewFD->setTemplateParameterListsInfo(Context, 4277 TemplateParamLists.size() - 1, 4278 TemplateParamLists.release()); 4279 } 4280 } else { 4281 // This is a function template specialization. 4282 isFunctionTemplateSpecialization = true; 4283 // For source fidelity, store all the template param lists. 4284 NewFD->setTemplateParameterListsInfo(Context, 4285 TemplateParamLists.size(), 4286 TemplateParamLists.release()); 4287 4288 // C++0x [temp.expl.spec]p20 forbids "template<> friend void foo(int);". 4289 if (isFriend) { 4290 // We want to remove the "template<>", found here. 4291 SourceRange RemoveRange = TemplateParams->getSourceRange(); 4292 4293 // If we remove the template<> and the name is not a 4294 // template-id, we're actually silently creating a problem: 4295 // the friend declaration will refer to an untemplated decl, 4296 // and clearly the user wants a template specialization. So 4297 // we need to insert '<>' after the name. 4298 SourceLocation InsertLoc; 4299 if (D.getName().getKind() != UnqualifiedId::IK_TemplateId) { 4300 InsertLoc = D.getName().getSourceRange().getEnd(); 4301 InsertLoc = PP.getLocForEndOfToken(InsertLoc); 4302 } 4303 4304 Diag(D.getIdentifierLoc(), diag::err_template_spec_decl_friend) 4305 << Name << RemoveRange 4306 << FixItHint::CreateRemoval(RemoveRange) 4307 << FixItHint::CreateInsertion(InsertLoc, "<>"); 4308 } 4309 } 4310 } 4311 else { 4312 // All template param lists were matched against the scope specifier: 4313 // this is NOT (an explicit specialization of) a template. 4314 if (TemplateParamLists.size() > 0) 4315 // For source fidelity, store all the template param lists. 4316 NewFD->setTemplateParameterListsInfo(Context, 4317 TemplateParamLists.size(), 4318 TemplateParamLists.release()); 4319 } 4320 4321 if (Invalid) { 4322 NewFD->setInvalidDecl(); 4323 if (FunctionTemplate) 4324 FunctionTemplate->setInvalidDecl(); 4325 } 4326 4327 // C++ [dcl.fct.spec]p5: 4328 // The virtual specifier shall only be used in declarations of 4329 // nonstatic class member functions that appear within a 4330 // member-specification of a class declaration; see 10.3. 4331 // 4332 if (isVirtual && !NewFD->isInvalidDecl()) { 4333 if (!isVirtualOkay) { 4334 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4335 diag::err_virtual_non_function); 4336 } else if (!CurContext->isRecord()) { 4337 // 'virtual' was specified outside of the class. 4338 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4339 diag::err_virtual_out_of_class) 4340 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 4341 } else if (NewFD->getDescribedFunctionTemplate()) { 4342 // C++ [temp.mem]p3: 4343 // A member function template shall not be virtual. 4344 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4345 diag::err_virtual_member_function_template) 4346 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 4347 } else { 4348 // Okay: Add virtual to the method. 4349 NewFD->setVirtualAsWritten(true); 4350 } 4351 } 4352 4353 // C++ [dcl.fct.spec]p3: 4354 // The inline specifier shall not appear on a block scope function declaration. 4355 if (isInline && !NewFD->isInvalidDecl()) { 4356 if (CurContext->isFunctionOrMethod()) { 4357 // 'inline' is not allowed on block scope function declaration. 4358 Diag(D.getDeclSpec().getInlineSpecLoc(), 4359 diag::err_inline_declaration_block_scope) << Name 4360 << FixItHint::CreateRemoval(D.getDeclSpec().getInlineSpecLoc()); 4361 } 4362 } 4363 4364 // C++ [dcl.fct.spec]p6: 4365 // The explicit specifier shall be used only in the declaration of a 4366 // constructor or conversion function within its class definition; see 12.3.1 4367 // and 12.3.2. 4368 if (isExplicit && !NewFD->isInvalidDecl()) { 4369 if (!CurContext->isRecord()) { 4370 // 'explicit' was specified outside of the class. 4371 Diag(D.getDeclSpec().getExplicitSpecLoc(), 4372 diag::err_explicit_out_of_class) 4373 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 4374 } else if (!isa<CXXConstructorDecl>(NewFD) && 4375 !isa<CXXConversionDecl>(NewFD)) { 4376 // 'explicit' was specified on a function that wasn't a constructor 4377 // or conversion function. 4378 Diag(D.getDeclSpec().getExplicitSpecLoc(), 4379 diag::err_explicit_non_ctor_or_conv_function) 4380 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 4381 } 4382 } 4383 4384 // Filter out previous declarations that don't match the scope. 4385 FilterLookupForScope(Previous, DC, S, NewFD->hasLinkage(), 4386 isExplicitSpecialization || 4387 isFunctionTemplateSpecialization); 4388 4389 if (isFriend) { 4390 // For now, claim that the objects have no previous declaration. 4391 if (FunctionTemplate) { 4392 FunctionTemplate->setObjectOfFriendDecl(false); 4393 FunctionTemplate->setAccess(AS_public); 4394 } 4395 NewFD->setObjectOfFriendDecl(false); 4396 NewFD->setAccess(AS_public); 4397 } 4398 4399 if (isa<CXXMethodDecl>(NewFD) && DC == CurContext && IsFunctionDefinition) { 4400 // A method is implicitly inline if it's defined in its class 4401 // definition. 4402 NewFD->setImplicitlyInline(); 4403 } 4404 4405 if (SC == SC_Static && isa<CXXMethodDecl>(NewFD) && 4406 !CurContext->isRecord()) { 4407 // C++ [class.static]p1: 4408 // A data or function member of a class may be declared static 4409 // in a class definition, in which case it is a static member of 4410 // the class. 4411 4412 // Complain about the 'static' specifier if it's on an out-of-line 4413 // member function definition. 4414 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4415 diag::err_static_out_of_line) 4416 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 4417 } 4418 } 4419 4420 // Handle GNU asm-label extension (encoded as an attribute). 4421 if (Expr *E = (Expr*) D.getAsmLabel()) { 4422 // The parser guarantees this is a string. 4423 StringLiteral *SE = cast<StringLiteral>(E); 4424 NewFD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), Context, 4425 SE->getString())); 4426 } 4427 4428 // Copy the parameter declarations from the declarator D to the function 4429 // declaration NewFD, if they are available. First scavenge them into Params. 4430 llvm::SmallVector<ParmVarDecl*, 16> Params; 4431 if (D.isFunctionDeclarator()) { 4432 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 4433 4434 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 4435 // function that takes no arguments, not a function that takes a 4436 // single void argument. 4437 // We let through "const void" here because Sema::GetTypeForDeclarator 4438 // already checks for that case. 4439 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 4440 FTI.ArgInfo[0].Param && 4441 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()) { 4442 // Empty arg list, don't push any params. 4443 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[0].Param); 4444 4445 // In C++, the empty parameter-type-list must be spelled "void"; a 4446 // typedef of void is not permitted. 4447 if (getLangOptions().CPlusPlus && 4448 Param->getType().getUnqualifiedType() != Context.VoidTy) { 4449 bool IsTypeAlias = false; 4450 if (const TypedefType *TT = Param->getType()->getAs<TypedefType>()) 4451 IsTypeAlias = isa<TypeAliasDecl>(TT->getDecl()); 4452 else if (const TemplateSpecializationType *TST = 4453 Param->getType()->getAs<TemplateSpecializationType>()) 4454 IsTypeAlias = TST->isTypeAlias(); 4455 Diag(Param->getLocation(), diag::err_param_typedef_of_void) 4456 << IsTypeAlias; 4457 } 4458 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 4459 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 4460 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 4461 assert(Param->getDeclContext() != NewFD && "Was set before ?"); 4462 Param->setDeclContext(NewFD); 4463 Params.push_back(Param); 4464 4465 if (Param->isInvalidDecl()) 4466 NewFD->setInvalidDecl(); 4467 } 4468 } 4469 4470 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) { 4471 // When we're declaring a function with a typedef, typeof, etc as in the 4472 // following example, we'll need to synthesize (unnamed) 4473 // parameters for use in the declaration. 4474 // 4475 // @code 4476 // typedef void fn(int); 4477 // fn f; 4478 // @endcode 4479 4480 // Synthesize a parameter for each argument type. 4481 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 4482 AE = FT->arg_type_end(); AI != AE; ++AI) { 4483 ParmVarDecl *Param = 4484 BuildParmVarDeclForTypedef(NewFD, D.getIdentifierLoc(), *AI); 4485 Param->setScopeInfo(0, Params.size()); 4486 Params.push_back(Param); 4487 } 4488 } else { 4489 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && 4490 "Should not need args for typedef of non-prototype fn"); 4491 } 4492 // Finally, we know we have the right number of parameters, install them. 4493 NewFD->setParams(Params.data(), Params.size()); 4494 4495 // Process the non-inheritable attributes on this declaration. 4496 ProcessDeclAttributes(S, NewFD, D, 4497 /*NonInheritable=*/true, /*Inheritable=*/false); 4498 4499 if (!getLangOptions().CPlusPlus) { 4500 // Perform semantic checking on the function declaration. 4501 bool isExplctSpecialization=false; 4502 CheckFunctionDeclaration(S, NewFD, Previous, isExplctSpecialization, 4503 Redeclaration); 4504 assert((NewFD->isInvalidDecl() || !Redeclaration || 4505 Previous.getResultKind() != LookupResult::FoundOverloaded) && 4506 "previous declaration set still overloaded"); 4507 } else { 4508 // If the declarator is a template-id, translate the parser's template 4509 // argument list into our AST format. 4510 bool HasExplicitTemplateArgs = false; 4511 TemplateArgumentListInfo TemplateArgs; 4512 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) { 4513 TemplateIdAnnotation *TemplateId = D.getName().TemplateId; 4514 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc); 4515 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc); 4516 ASTTemplateArgsPtr TemplateArgsPtr(*this, 4517 TemplateId->getTemplateArgs(), 4518 TemplateId->NumArgs); 4519 translateTemplateArguments(TemplateArgsPtr, 4520 TemplateArgs); 4521 TemplateArgsPtr.release(); 4522 4523 HasExplicitTemplateArgs = true; 4524 4525 if (FunctionTemplate) { 4526 // Function template with explicit template arguments. 4527 Diag(D.getIdentifierLoc(), diag::err_function_template_partial_spec) 4528 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc); 4529 4530 HasExplicitTemplateArgs = false; 4531 } else if (!isFunctionTemplateSpecialization && 4532 !D.getDeclSpec().isFriendSpecified()) { 4533 // We have encountered something that the user meant to be a 4534 // specialization (because it has explicitly-specified template 4535 // arguments) but that was not introduced with a "template<>" (or had 4536 // too few of them). 4537 Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header) 4538 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc) 4539 << FixItHint::CreateInsertion( 4540 D.getDeclSpec().getSourceRange().getBegin(), 4541 "template<> "); 4542 isFunctionTemplateSpecialization = true; 4543 } else { 4544 // "friend void foo<>(int);" is an implicit specialization decl. 4545 isFunctionTemplateSpecialization = true; 4546 } 4547 } else if (isFriend && isFunctionTemplateSpecialization) { 4548 // This combination is only possible in a recovery case; the user 4549 // wrote something like: 4550 // template <> friend void foo(int); 4551 // which we're recovering from as if the user had written: 4552 // friend void foo<>(int); 4553 // Go ahead and fake up a template id. 4554 HasExplicitTemplateArgs = true; 4555 TemplateArgs.setLAngleLoc(D.getIdentifierLoc()); 4556 TemplateArgs.setRAngleLoc(D.getIdentifierLoc()); 4557 } 4558 4559 // If it's a friend (and only if it's a friend), it's possible 4560 // that either the specialized function type or the specialized 4561 // template is dependent, and therefore matching will fail. In 4562 // this case, don't check the specialization yet. 4563 if (isFunctionTemplateSpecialization && isFriend && 4564 (NewFD->getType()->isDependentType() || DC->isDependentContext())) { 4565 assert(HasExplicitTemplateArgs && 4566 "friend function specialization without template args"); 4567 if (CheckDependentFunctionTemplateSpecialization(NewFD, TemplateArgs, 4568 Previous)) 4569 NewFD->setInvalidDecl(); 4570 } else if (isFunctionTemplateSpecialization) { 4571 if (CurContext->isDependentContext() && CurContext->isRecord() 4572 && !isFriend && !getLangOptions().Microsoft) { 4573 Diag(NewFD->getLocation(), diag::err_function_specialization_in_class) 4574 << NewFD->getDeclName(); 4575 NewFD->setInvalidDecl(); 4576 return 0; 4577 } else if (CheckFunctionTemplateSpecialization(NewFD, 4578 (HasExplicitTemplateArgs ? &TemplateArgs : 0), 4579 Previous)) 4580 NewFD->setInvalidDecl(); 4581 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD)) { 4582 if (CheckMemberSpecialization(NewFD, Previous)) 4583 NewFD->setInvalidDecl(); 4584 } 4585 4586 // Perform semantic checking on the function declaration. 4587 CheckFunctionDeclaration(S, NewFD, Previous, isExplicitSpecialization, 4588 Redeclaration); 4589 4590 assert((NewFD->isInvalidDecl() || !Redeclaration || 4591 Previous.getResultKind() != LookupResult::FoundOverloaded) && 4592 "previous declaration set still overloaded"); 4593 4594 NamedDecl *PrincipalDecl = (FunctionTemplate 4595 ? cast<NamedDecl>(FunctionTemplate) 4596 : NewFD); 4597 4598 if (isFriend && Redeclaration) { 4599 AccessSpecifier Access = AS_public; 4600 if (!NewFD->isInvalidDecl()) 4601 Access = NewFD->getPreviousDeclaration()->getAccess(); 4602 4603 NewFD->setAccess(Access); 4604 if (FunctionTemplate) FunctionTemplate->setAccess(Access); 4605 4606 PrincipalDecl->setObjectOfFriendDecl(true); 4607 } 4608 4609 if (NewFD->isOverloadedOperator() && !DC->isRecord() && 4610 PrincipalDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary)) 4611 PrincipalDecl->setNonMemberOperator(); 4612 4613 // If we have a function template, check the template parameter 4614 // list. This will check and merge default template arguments. 4615 if (FunctionTemplate) { 4616 FunctionTemplateDecl *PrevTemplate = FunctionTemplate->getPreviousDeclaration(); 4617 CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(), 4618 PrevTemplate? PrevTemplate->getTemplateParameters() : 0, 4619 D.getDeclSpec().isFriendSpecified() 4620 ? (IsFunctionDefinition 4621 ? TPC_FriendFunctionTemplateDefinition 4622 : TPC_FriendFunctionTemplate) 4623 : (D.getCXXScopeSpec().isSet() && 4624 DC && DC->isRecord() && 4625 DC->isDependentContext()) 4626 ? TPC_ClassTemplateMember 4627 : TPC_FunctionTemplate); 4628 } 4629 4630 if (NewFD->isInvalidDecl()) { 4631 // Ignore all the rest of this. 4632 } else if (!Redeclaration) { 4633 // Fake up an access specifier if it's supposed to be a class member. 4634 if (isa<CXXRecordDecl>(NewFD->getDeclContext())) 4635 NewFD->setAccess(AS_public); 4636 4637 // Qualified decls generally require a previous declaration. 4638 if (D.getCXXScopeSpec().isSet()) { 4639 // ...with the major exception of templated-scope or 4640 // dependent-scope friend declarations. 4641 4642 // TODO: we currently also suppress this check in dependent 4643 // contexts because (1) the parameter depth will be off when 4644 // matching friend templates and (2) we might actually be 4645 // selecting a friend based on a dependent factor. But there 4646 // are situations where these conditions don't apply and we 4647 // can actually do this check immediately. 4648 if (isFriend && 4649 (TemplateParamLists.size() || 4650 D.getCXXScopeSpec().getScopeRep()->isDependent() || 4651 CurContext->isDependentContext())) { 4652 // ignore these 4653 } else { 4654 // The user tried to provide an out-of-line definition for a 4655 // function that is a member of a class or namespace, but there 4656 // was no such member function declared (C++ [class.mfct]p2, 4657 // C++ [namespace.memdef]p2). For example: 4658 // 4659 // class X { 4660 // void f() const; 4661 // }; 4662 // 4663 // void X::f() { } // ill-formed 4664 // 4665 // Complain about this problem, and attempt to suggest close 4666 // matches (e.g., those that differ only in cv-qualifiers and 4667 // whether the parameter types are references). 4668 Diag(D.getIdentifierLoc(), diag::err_member_def_does_not_match) 4669 << Name << DC << D.getCXXScopeSpec().getRange(); 4670 NewFD->setInvalidDecl(); 4671 4672 DiagnoseInvalidRedeclaration(*this, NewFD); 4673 } 4674 4675 // Unqualified local friend declarations are required to resolve 4676 // to something. 4677 } else if (isFriend && cast<CXXRecordDecl>(CurContext)->isLocalClass()) { 4678 Diag(D.getIdentifierLoc(), diag::err_no_matching_local_friend); 4679 NewFD->setInvalidDecl(); 4680 DiagnoseInvalidRedeclaration(*this, NewFD); 4681 } 4682 4683 } else if (!IsFunctionDefinition && D.getCXXScopeSpec().isSet() && 4684 !isFriend && !isFunctionTemplateSpecialization && 4685 !isExplicitSpecialization) { 4686 // An out-of-line member function declaration must also be a 4687 // definition (C++ [dcl.meaning]p1). 4688 // Note that this is not the case for explicit specializations of 4689 // function templates or member functions of class templates, per 4690 // C++ [temp.expl.spec]p2. We also allow these declarations as an extension 4691 // for compatibility with old SWIG code which likes to generate them. 4692 Diag(NewFD->getLocation(), diag::ext_out_of_line_declaration) 4693 << D.getCXXScopeSpec().getRange(); 4694 } 4695 } 4696 4697 4698 // Handle attributes. We need to have merged decls when handling attributes 4699 // (for example to check for conflicts, etc). 4700 // FIXME: This needs to happen before we merge declarations. Then, 4701 // let attribute merging cope with attribute conflicts. 4702 ProcessDeclAttributes(S, NewFD, D, 4703 /*NonInheritable=*/false, /*Inheritable=*/true); 4704 4705 // attributes declared post-definition are currently ignored 4706 // FIXME: This should happen during attribute merging 4707 if (Redeclaration && Previous.isSingleResult()) { 4708 const FunctionDecl *Def; 4709 FunctionDecl *PrevFD = dyn_cast<FunctionDecl>(Previous.getFoundDecl()); 4710 if (PrevFD && PrevFD->isDefined(Def) && D.hasAttributes()) { 4711 Diag(NewFD->getLocation(), diag::warn_attribute_precede_definition); 4712 Diag(Def->getLocation(), diag::note_previous_definition); 4713 } 4714 } 4715 4716 AddKnownFunctionAttributes(NewFD); 4717 4718 if (NewFD->hasAttr<OverloadableAttr>() && 4719 !NewFD->getType()->getAs<FunctionProtoType>()) { 4720 Diag(NewFD->getLocation(), 4721 diag::err_attribute_overloadable_no_prototype) 4722 << NewFD; 4723 4724 // Turn this into a variadic function with no parameters. 4725 const FunctionType *FT = NewFD->getType()->getAs<FunctionType>(); 4726 FunctionProtoType::ExtProtoInfo EPI; 4727 EPI.Variadic = true; 4728 EPI.ExtInfo = FT->getExtInfo(); 4729 4730 QualType R = Context.getFunctionType(FT->getResultType(), 0, 0, EPI); 4731 NewFD->setType(R); 4732 } 4733 4734 // If there's a #pragma GCC visibility in scope, and this isn't a class 4735 // member, set the visibility of this function. 4736 if (NewFD->getLinkage() == ExternalLinkage && !DC->isRecord()) 4737 AddPushedVisibilityAttribute(NewFD); 4738 4739 // If this is a locally-scoped extern C function, update the 4740 // map of such names. 4741 if (CurContext->isFunctionOrMethod() && NewFD->isExternC() 4742 && !NewFD->isInvalidDecl()) 4743 RegisterLocallyScopedExternCDecl(NewFD, Previous, S); 4744 4745 // Set this FunctionDecl's range up to the right paren. 4746 NewFD->setRangeEnd(D.getSourceRange().getEnd()); 4747 4748 if (getLangOptions().CPlusPlus) { 4749 if (FunctionTemplate) { 4750 if (NewFD->isInvalidDecl()) 4751 FunctionTemplate->setInvalidDecl(); 4752 return FunctionTemplate; 4753 } 4754 } 4755 4756 MarkUnusedFileScopedDecl(NewFD); 4757 4758 if (getLangOptions().CUDA) 4759 if (IdentifierInfo *II = NewFD->getIdentifier()) 4760 if (!NewFD->isInvalidDecl() && 4761 NewFD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 4762 if (II->isStr("cudaConfigureCall")) { 4763 if (!R->getAs<FunctionType>()->getResultType()->isScalarType()) 4764 Diag(NewFD->getLocation(), diag::err_config_scalar_return); 4765 4766 Context.setcudaConfigureCallDecl(NewFD); 4767 } 4768 } 4769 4770 return NewFD; 4771} 4772 4773/// \brief Perform semantic checking of a new function declaration. 4774/// 4775/// Performs semantic analysis of the new function declaration 4776/// NewFD. This routine performs all semantic checking that does not 4777/// require the actual declarator involved in the declaration, and is 4778/// used both for the declaration of functions as they are parsed 4779/// (called via ActOnDeclarator) and for the declaration of functions 4780/// that have been instantiated via C++ template instantiation (called 4781/// via InstantiateDecl). 4782/// 4783/// \param IsExplicitSpecialiation whether this new function declaration is 4784/// an explicit specialization of the previous declaration. 4785/// 4786/// This sets NewFD->isInvalidDecl() to true if there was an error. 4787void Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD, 4788 LookupResult &Previous, 4789 bool IsExplicitSpecialization, 4790 bool &Redeclaration) { 4791 // If NewFD is already known erroneous, don't do any of this checking. 4792 if (NewFD->isInvalidDecl()) { 4793 // If this is a class member, mark the class invalid immediately. 4794 // This avoids some consistency errors later. 4795 if (isa<CXXMethodDecl>(NewFD)) 4796 cast<CXXMethodDecl>(NewFD)->getParent()->setInvalidDecl(); 4797 4798 return; 4799 } 4800 4801 if (NewFD->getResultType()->isVariablyModifiedType()) { 4802 // Functions returning a variably modified type violate C99 6.7.5.2p2 4803 // because all functions have linkage. 4804 Diag(NewFD->getLocation(), diag::err_vm_func_decl); 4805 return NewFD->setInvalidDecl(); 4806 } 4807 4808 if (NewFD->isMain()) 4809 CheckMain(NewFD); 4810 4811 // Check for a previous declaration of this name. 4812 if (Previous.empty() && NewFD->isExternC()) { 4813 // Since we did not find anything by this name and we're declaring 4814 // an extern "C" function, look for a non-visible extern "C" 4815 // declaration with the same name. 4816 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 4817 = LocallyScopedExternalDecls.find(NewFD->getDeclName()); 4818 if (Pos != LocallyScopedExternalDecls.end()) 4819 Previous.addDecl(Pos->second); 4820 } 4821 4822 // Merge or overload the declaration with an existing declaration of 4823 // the same name, if appropriate. 4824 if (!Previous.empty()) { 4825 // Determine whether NewFD is an overload of PrevDecl or 4826 // a declaration that requires merging. If it's an overload, 4827 // there's no more work to do here; we'll just add the new 4828 // function to the scope. 4829 4830 NamedDecl *OldDecl = 0; 4831 if (!AllowOverloadingOfFunction(Previous, Context)) { 4832 Redeclaration = true; 4833 OldDecl = Previous.getFoundDecl(); 4834 } else { 4835 switch (CheckOverload(S, NewFD, Previous, OldDecl, 4836 /*NewIsUsingDecl*/ false)) { 4837 case Ovl_Match: 4838 Redeclaration = true; 4839 break; 4840 4841 case Ovl_NonFunction: 4842 Redeclaration = true; 4843 break; 4844 4845 case Ovl_Overload: 4846 Redeclaration = false; 4847 break; 4848 } 4849 4850 if (!getLangOptions().CPlusPlus && !NewFD->hasAttr<OverloadableAttr>()) { 4851 // If a function name is overloadable in C, then every function 4852 // with that name must be marked "overloadable". 4853 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 4854 << Redeclaration << NewFD; 4855 NamedDecl *OverloadedDecl = 0; 4856 if (Redeclaration) 4857 OverloadedDecl = OldDecl; 4858 else if (!Previous.empty()) 4859 OverloadedDecl = Previous.getRepresentativeDecl(); 4860 if (OverloadedDecl) 4861 Diag(OverloadedDecl->getLocation(), 4862 diag::note_attribute_overloadable_prev_overload); 4863 NewFD->addAttr(::new (Context) OverloadableAttr(SourceLocation(), 4864 Context)); 4865 } 4866 } 4867 4868 if (Redeclaration) { 4869 // NewFD and OldDecl represent declarations that need to be 4870 // merged. 4871 if (MergeFunctionDecl(NewFD, OldDecl)) 4872 return NewFD->setInvalidDecl(); 4873 4874 Previous.clear(); 4875 Previous.addDecl(OldDecl); 4876 4877 if (FunctionTemplateDecl *OldTemplateDecl 4878 = dyn_cast<FunctionTemplateDecl>(OldDecl)) { 4879 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl()); 4880 FunctionTemplateDecl *NewTemplateDecl 4881 = NewFD->getDescribedFunctionTemplate(); 4882 assert(NewTemplateDecl && "Template/non-template mismatch"); 4883 if (CXXMethodDecl *Method 4884 = dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) { 4885 Method->setAccess(OldTemplateDecl->getAccess()); 4886 NewTemplateDecl->setAccess(OldTemplateDecl->getAccess()); 4887 } 4888 4889 // If this is an explicit specialization of a member that is a function 4890 // template, mark it as a member specialization. 4891 if (IsExplicitSpecialization && 4892 NewTemplateDecl->getInstantiatedFromMemberTemplate()) { 4893 NewTemplateDecl->setMemberSpecialization(); 4894 assert(OldTemplateDecl->isMemberSpecialization()); 4895 } 4896 } else { 4897 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions 4898 NewFD->setAccess(OldDecl->getAccess()); 4899 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 4900 } 4901 } 4902 } 4903 4904 // Semantic checking for this function declaration (in isolation). 4905 if (getLangOptions().CPlusPlus) { 4906 // C++-specific checks. 4907 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { 4908 CheckConstructor(Constructor); 4909 } else if (CXXDestructorDecl *Destructor = 4910 dyn_cast<CXXDestructorDecl>(NewFD)) { 4911 CXXRecordDecl *Record = Destructor->getParent(); 4912 QualType ClassType = Context.getTypeDeclType(Record); 4913 4914 // FIXME: Shouldn't we be able to perform this check even when the class 4915 // type is dependent? Both gcc and edg can handle that. 4916 if (!ClassType->isDependentType()) { 4917 DeclarationName Name 4918 = Context.DeclarationNames.getCXXDestructorName( 4919 Context.getCanonicalType(ClassType)); 4920 if (NewFD->getDeclName() != Name) { 4921 Diag(NewFD->getLocation(), diag::err_destructor_name); 4922 return NewFD->setInvalidDecl(); 4923 } 4924 } 4925 } else if (CXXConversionDecl *Conversion 4926 = dyn_cast<CXXConversionDecl>(NewFD)) { 4927 ActOnConversionDeclarator(Conversion); 4928 } 4929 4930 // Find any virtual functions that this function overrides. 4931 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) { 4932 if (!Method->isFunctionTemplateSpecialization() && 4933 !Method->getDescribedFunctionTemplate()) { 4934 if (AddOverriddenMethods(Method->getParent(), Method)) { 4935 // If the function was marked as "static", we have a problem. 4936 if (NewFD->getStorageClass() == SC_Static) { 4937 Diag(NewFD->getLocation(), diag::err_static_overrides_virtual) 4938 << NewFD->getDeclName(); 4939 for (CXXMethodDecl::method_iterator 4940 Overridden = Method->begin_overridden_methods(), 4941 OverriddenEnd = Method->end_overridden_methods(); 4942 Overridden != OverriddenEnd; 4943 ++Overridden) { 4944 Diag((*Overridden)->getLocation(), 4945 diag::note_overridden_virtual_function); 4946 } 4947 } 4948 } 4949 } 4950 } 4951 4952 // Extra checking for C++ overloaded operators (C++ [over.oper]). 4953 if (NewFD->isOverloadedOperator() && 4954 CheckOverloadedOperatorDeclaration(NewFD)) 4955 return NewFD->setInvalidDecl(); 4956 4957 // Extra checking for C++0x literal operators (C++0x [over.literal]). 4958 if (NewFD->getLiteralIdentifier() && 4959 CheckLiteralOperatorDeclaration(NewFD)) 4960 return NewFD->setInvalidDecl(); 4961 4962 // In C++, check default arguments now that we have merged decls. Unless 4963 // the lexical context is the class, because in this case this is done 4964 // during delayed parsing anyway. 4965 if (!CurContext->isRecord()) 4966 CheckCXXDefaultArguments(NewFD); 4967 4968 // If this function declares a builtin function, check the type of this 4969 // declaration against the expected type for the builtin. 4970 if (unsigned BuiltinID = NewFD->getBuiltinID()) { 4971 ASTContext::GetBuiltinTypeError Error; 4972 QualType T = Context.GetBuiltinType(BuiltinID, Error); 4973 if (!T.isNull() && !Context.hasSameType(T, NewFD->getType())) { 4974 // The type of this function differs from the type of the builtin, 4975 // so forget about the builtin entirely. 4976 Context.BuiltinInfo.ForgetBuiltin(BuiltinID, Context.Idents); 4977 } 4978 } 4979 } 4980} 4981 4982void Sema::CheckMain(FunctionDecl* FD) { 4983 // C++ [basic.start.main]p3: A program that declares main to be inline 4984 // or static is ill-formed. 4985 // C99 6.7.4p4: In a hosted environment, the inline function specifier 4986 // shall not appear in a declaration of main. 4987 // static main is not an error under C99, but we should warn about it. 4988 bool isInline = FD->isInlineSpecified(); 4989 bool isStatic = FD->getStorageClass() == SC_Static; 4990 if (isInline || isStatic) { 4991 unsigned diagID = diag::warn_unusual_main_decl; 4992 if (isInline || getLangOptions().CPlusPlus) 4993 diagID = diag::err_unusual_main_decl; 4994 4995 int which = isStatic + (isInline << 1) - 1; 4996 Diag(FD->getLocation(), diagID) << which; 4997 } 4998 4999 QualType T = FD->getType(); 5000 assert(T->isFunctionType() && "function decl is not of function type"); 5001 const FunctionType* FT = T->getAs<FunctionType>(); 5002 5003 if (!Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) { 5004 Diag(FD->getTypeSpecStartLoc(), diag::err_main_returns_nonint); 5005 FD->setInvalidDecl(true); 5006 } 5007 5008 // Treat protoless main() as nullary. 5009 if (isa<FunctionNoProtoType>(FT)) return; 5010 5011 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT); 5012 unsigned nparams = FTP->getNumArgs(); 5013 assert(FD->getNumParams() == nparams); 5014 5015 bool HasExtraParameters = (nparams > 3); 5016 5017 // Darwin passes an undocumented fourth argument of type char**. If 5018 // other platforms start sprouting these, the logic below will start 5019 // getting shifty. 5020 if (nparams == 4 && Context.Target.getTriple().isOSDarwin()) 5021 HasExtraParameters = false; 5022 5023 if (HasExtraParameters) { 5024 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams; 5025 FD->setInvalidDecl(true); 5026 nparams = 3; 5027 } 5028 5029 // FIXME: a lot of the following diagnostics would be improved 5030 // if we had some location information about types. 5031 5032 QualType CharPP = 5033 Context.getPointerType(Context.getPointerType(Context.CharTy)); 5034 QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP }; 5035 5036 for (unsigned i = 0; i < nparams; ++i) { 5037 QualType AT = FTP->getArgType(i); 5038 5039 bool mismatch = true; 5040 5041 if (Context.hasSameUnqualifiedType(AT, Expected[i])) 5042 mismatch = false; 5043 else if (Expected[i] == CharPP) { 5044 // As an extension, the following forms are okay: 5045 // char const ** 5046 // char const * const * 5047 // char * const * 5048 5049 QualifierCollector qs; 5050 const PointerType* PT; 5051 if ((PT = qs.strip(AT)->getAs<PointerType>()) && 5052 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) && 5053 (QualType(qs.strip(PT->getPointeeType()), 0) == Context.CharTy)) { 5054 qs.removeConst(); 5055 mismatch = !qs.empty(); 5056 } 5057 } 5058 5059 if (mismatch) { 5060 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i]; 5061 // TODO: suggest replacing given type with expected type 5062 FD->setInvalidDecl(true); 5063 } 5064 } 5065 5066 if (nparams == 1 && !FD->isInvalidDecl()) { 5067 Diag(FD->getLocation(), diag::warn_main_one_arg); 5068 } 5069 5070 if (!FD->isInvalidDecl() && FD->getDescribedFunctionTemplate()) { 5071 Diag(FD->getLocation(), diag::err_main_template_decl); 5072 FD->setInvalidDecl(); 5073 } 5074} 5075 5076bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 5077 // FIXME: Need strict checking. In C89, we need to check for 5078 // any assignment, increment, decrement, function-calls, or 5079 // commas outside of a sizeof. In C99, it's the same list, 5080 // except that the aforementioned are allowed in unevaluated 5081 // expressions. Everything else falls under the 5082 // "may accept other forms of constant expressions" exception. 5083 // (We never end up here for C++, so the constant expression 5084 // rules there don't matter.) 5085 if (Init->isConstantInitializer(Context, false)) 5086 return false; 5087 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 5088 << Init->getSourceRange(); 5089 return true; 5090} 5091 5092namespace { 5093 // Visits an initialization expression to see if OrigDecl is evaluated in 5094 // its own initialization and throws a warning if it does. 5095 class SelfReferenceChecker 5096 : public EvaluatedExprVisitor<SelfReferenceChecker> { 5097 Sema &S; 5098 Decl *OrigDecl; 5099 5100 public: 5101 typedef EvaluatedExprVisitor<SelfReferenceChecker> Inherited; 5102 5103 SelfReferenceChecker(Sema &S, Decl *OrigDecl) : Inherited(S.Context), 5104 S(S), OrigDecl(OrigDecl) { } 5105 5106 void VisitExpr(Expr *E) { 5107 if (isa<ObjCMessageExpr>(*E)) return; 5108 Inherited::VisitExpr(E); 5109 } 5110 5111 void VisitImplicitCastExpr(ImplicitCastExpr *E) { 5112 CheckForSelfReference(E); 5113 Inherited::VisitImplicitCastExpr(E); 5114 } 5115 5116 void CheckForSelfReference(ImplicitCastExpr *E) { 5117 if (E->getCastKind() != CK_LValueToRValue) return; 5118 Expr* SubExpr = E->getSubExpr()->IgnoreParenImpCasts(); 5119 DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(SubExpr); 5120 if (!DRE) return; 5121 Decl* ReferenceDecl = DRE->getDecl(); 5122 if (OrigDecl != ReferenceDecl) return; 5123 LookupResult Result(S, DRE->getNameInfo(), Sema::LookupOrdinaryName, 5124 Sema::NotForRedeclaration); 5125 S.Diag(SubExpr->getLocStart(), diag::warn_uninit_self_reference_in_init) 5126 << Result.getLookupName() << OrigDecl->getLocation() 5127 << SubExpr->getSourceRange(); 5128 } 5129 }; 5130} 5131 5132/// AddInitializerToDecl - Adds the initializer Init to the 5133/// declaration dcl. If DirectInit is true, this is C++ direct 5134/// initialization rather than copy initialization. 5135void Sema::AddInitializerToDecl(Decl *RealDecl, Expr *Init, 5136 bool DirectInit, bool TypeMayContainAuto) { 5137 // If there is no declaration, there was an error parsing it. Just ignore 5138 // the initializer. 5139 if (RealDecl == 0 || RealDecl->isInvalidDecl()) 5140 return; 5141 5142 // Check for self-references within variable initializers. 5143 if (VarDecl *vd = dyn_cast<VarDecl>(RealDecl)) { 5144 // Variables declared within a function/method body are handled 5145 // by a dataflow analysis. 5146 if (!vd->hasLocalStorage() && !vd->isStaticLocal()) 5147 SelfReferenceChecker(*this, RealDecl).VisitExpr(Init); 5148 } 5149 else { 5150 SelfReferenceChecker(*this, RealDecl).VisitExpr(Init); 5151 } 5152 5153 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 5154 // With declarators parsed the way they are, the parser cannot 5155 // distinguish between a normal initializer and a pure-specifier. 5156 // Thus this grotesque test. 5157 IntegerLiteral *IL; 5158 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 5159 Context.getCanonicalType(IL->getType()) == Context.IntTy) 5160 CheckPureMethod(Method, Init->getSourceRange()); 5161 else { 5162 Diag(Method->getLocation(), diag::err_member_function_initialization) 5163 << Method->getDeclName() << Init->getSourceRange(); 5164 Method->setInvalidDecl(); 5165 } 5166 return; 5167 } 5168 5169 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 5170 if (!VDecl) { 5171 if (getLangOptions().CPlusPlus && 5172 RealDecl->getLexicalDeclContext()->isRecord() && 5173 isa<NamedDecl>(RealDecl)) 5174 Diag(RealDecl->getLocation(), diag::err_member_initialization); 5175 else 5176 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 5177 RealDecl->setInvalidDecl(); 5178 return; 5179 } 5180 5181 // C++0x [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 5182 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 5183 TypeSourceInfo *DeducedType = 0; 5184 if (!DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType)) 5185 Diag(VDecl->getLocation(), diag::err_auto_var_deduction_failure) 5186 << VDecl->getDeclName() << VDecl->getType() << Init->getType() 5187 << Init->getSourceRange(); 5188 if (!DeducedType) { 5189 RealDecl->setInvalidDecl(); 5190 return; 5191 } 5192 VDecl->setTypeSourceInfo(DeducedType); 5193 VDecl->setType(DeducedType->getType()); 5194 5195 // If this is a redeclaration, check that the type we just deduced matches 5196 // the previously declared type. 5197 if (VarDecl *Old = VDecl->getPreviousDeclaration()) 5198 MergeVarDeclTypes(VDecl, Old); 5199 } 5200 5201 5202 // A definition must end up with a complete type, which means it must be 5203 // complete with the restriction that an array type might be completed by the 5204 // initializer; note that later code assumes this restriction. 5205 QualType BaseDeclType = VDecl->getType(); 5206 if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType)) 5207 BaseDeclType = Array->getElementType(); 5208 if (RequireCompleteType(VDecl->getLocation(), BaseDeclType, 5209 diag::err_typecheck_decl_incomplete_type)) { 5210 RealDecl->setInvalidDecl(); 5211 return; 5212 } 5213 5214 // The variable can not have an abstract class type. 5215 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 5216 diag::err_abstract_type_in_decl, 5217 AbstractVariableType)) 5218 VDecl->setInvalidDecl(); 5219 5220 const VarDecl *Def; 5221 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 5222 Diag(VDecl->getLocation(), diag::err_redefinition) 5223 << VDecl->getDeclName(); 5224 Diag(Def->getLocation(), diag::note_previous_definition); 5225 VDecl->setInvalidDecl(); 5226 return; 5227 } 5228 5229 const VarDecl* PrevInit = 0; 5230 if (getLangOptions().CPlusPlus) { 5231 // C++ [class.static.data]p4 5232 // If a static data member is of const integral or const 5233 // enumeration type, its declaration in the class definition can 5234 // specify a constant-initializer which shall be an integral 5235 // constant expression (5.19). In that case, the member can appear 5236 // in integral constant expressions. The member shall still be 5237 // defined in a namespace scope if it is used in the program and the 5238 // namespace scope definition shall not contain an initializer. 5239 // 5240 // We already performed a redefinition check above, but for static 5241 // data members we also need to check whether there was an in-class 5242 // declaration with an initializer. 5243 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 5244 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 5245 Diag(PrevInit->getLocation(), diag::note_previous_definition); 5246 return; 5247 } 5248 5249 if (VDecl->hasLocalStorage()) 5250 getCurFunction()->setHasBranchProtectedScope(); 5251 5252 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) { 5253 VDecl->setInvalidDecl(); 5254 return; 5255 } 5256 } 5257 5258 // Capture the variable that is being initialized and the style of 5259 // initialization. 5260 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 5261 5262 // FIXME: Poor source location information. 5263 InitializationKind Kind 5264 = DirectInit? InitializationKind::CreateDirect(VDecl->getLocation(), 5265 Init->getLocStart(), 5266 Init->getLocEnd()) 5267 : InitializationKind::CreateCopy(VDecl->getLocation(), 5268 Init->getLocStart()); 5269 5270 // Get the decls type and save a reference for later, since 5271 // CheckInitializerTypes may change it. 5272 QualType DclT = VDecl->getType(), SavT = DclT; 5273 if (VDecl->isLocalVarDecl()) { 5274 if (VDecl->hasExternalStorage()) { // C99 6.7.8p5 5275 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 5276 VDecl->setInvalidDecl(); 5277 } else if (!VDecl->isInvalidDecl()) { 5278 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 5279 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 5280 MultiExprArg(*this, &Init, 1), 5281 &DclT); 5282 if (Result.isInvalid()) { 5283 VDecl->setInvalidDecl(); 5284 return; 5285 } 5286 5287 Init = Result.takeAs<Expr>(); 5288 5289 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 5290 // Don't check invalid declarations to avoid emitting useless diagnostics. 5291 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 5292 if (VDecl->getStorageClass() == SC_Static) // C99 6.7.8p4. 5293 CheckForConstantInitializer(Init, DclT); 5294 } 5295 } 5296 } else if (VDecl->isStaticDataMember() && 5297 VDecl->getLexicalDeclContext()->isRecord()) { 5298 // This is an in-class initialization for a static data member, e.g., 5299 // 5300 // struct S { 5301 // static const int value = 17; 5302 // }; 5303 5304 // Try to perform the initialization regardless. 5305 if (!VDecl->isInvalidDecl()) { 5306 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 5307 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 5308 MultiExprArg(*this, &Init, 1), 5309 &DclT); 5310 if (Result.isInvalid()) { 5311 VDecl->setInvalidDecl(); 5312 return; 5313 } 5314 5315 Init = Result.takeAs<Expr>(); 5316 } 5317 5318 // C++ [class.mem]p4: 5319 // A member-declarator can contain a constant-initializer only 5320 // if it declares a static member (9.4) of const integral or 5321 // const enumeration type, see 9.4.2. 5322 QualType T = VDecl->getType(); 5323 5324 // Do nothing on dependent types. 5325 if (T->isDependentType()) { 5326 5327 // Require constness. 5328 } else if (!T.isConstQualified()) { 5329 Diag(VDecl->getLocation(), diag::err_in_class_initializer_non_const) 5330 << Init->getSourceRange(); 5331 VDecl->setInvalidDecl(); 5332 5333 // We allow integer constant expressions in all cases. 5334 } else if (T->isIntegralOrEnumerationType()) { 5335 if (!Init->isValueDependent()) { 5336 // Check whether the expression is a constant expression. 5337 llvm::APSInt Value; 5338 SourceLocation Loc; 5339 if (!Init->isIntegerConstantExpr(Value, Context, &Loc)) { 5340 Diag(Loc, diag::err_in_class_initializer_non_constant) 5341 << Init->getSourceRange(); 5342 VDecl->setInvalidDecl(); 5343 } 5344 } 5345 5346 // We allow floating-point constants as an extension in C++03, and 5347 // C++0x has far more complicated rules that we don't really 5348 // implement fully. 5349 } else { 5350 bool Allowed = false; 5351 if (getLangOptions().CPlusPlus0x) { 5352 Allowed = T->isLiteralType(); 5353 } else if (T->isFloatingType()) { // also permits complex, which is ok 5354 Diag(VDecl->getLocation(), diag::ext_in_class_initializer_float_type) 5355 << T << Init->getSourceRange(); 5356 Allowed = true; 5357 } 5358 5359 if (!Allowed) { 5360 Diag(VDecl->getLocation(), diag::err_in_class_initializer_bad_type) 5361 << T << Init->getSourceRange(); 5362 VDecl->setInvalidDecl(); 5363 5364 // TODO: there are probably expressions that pass here that shouldn't. 5365 } else if (!Init->isValueDependent() && 5366 !Init->isConstantInitializer(Context, false)) { 5367 Diag(Init->getExprLoc(), diag::err_in_class_initializer_non_constant) 5368 << Init->getSourceRange(); 5369 VDecl->setInvalidDecl(); 5370 } 5371 } 5372 } else if (VDecl->isFileVarDecl()) { 5373 if (VDecl->getStorageClassAsWritten() == SC_Extern && 5374 (!getLangOptions().CPlusPlus || 5375 !Context.getBaseElementType(VDecl->getType()).isConstQualified())) 5376 Diag(VDecl->getLocation(), diag::warn_extern_init); 5377 if (!VDecl->isInvalidDecl()) { 5378 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 5379 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 5380 MultiExprArg(*this, &Init, 1), 5381 &DclT); 5382 if (Result.isInvalid()) { 5383 VDecl->setInvalidDecl(); 5384 return; 5385 } 5386 5387 Init = Result.takeAs<Expr>(); 5388 } 5389 5390 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 5391 // Don't check invalid declarations to avoid emitting useless diagnostics. 5392 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 5393 // C99 6.7.8p4. All file scoped initializers need to be constant. 5394 CheckForConstantInitializer(Init, DclT); 5395 } 5396 } 5397 // If the type changed, it means we had an incomplete type that was 5398 // completed by the initializer. For example: 5399 // int ary[] = { 1, 3, 5 }; 5400 // "ary" transitions from a VariableArrayType to a ConstantArrayType. 5401 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 5402 VDecl->setType(DclT); 5403 Init->setType(DclT); 5404 } 5405 5406 5407 // If this variable is a local declaration with record type, make sure it 5408 // doesn't have a flexible member initialization. We only support this as a 5409 // global/static definition. 5410 if (VDecl->hasLocalStorage()) 5411 if (const RecordType *RT = VDecl->getType()->getAs<RecordType>()) 5412 if (RT->getDecl()->hasFlexibleArrayMember()) { 5413 // Check whether the initializer tries to initialize the flexible 5414 // array member itself to anything other than an empty initializer list. 5415 if (InitListExpr *ILE = dyn_cast<InitListExpr>(Init)) { 5416 unsigned Index = std::distance(RT->getDecl()->field_begin(), 5417 RT->getDecl()->field_end()) - 1; 5418 if (Index < ILE->getNumInits() && 5419 !(isa<InitListExpr>(ILE->getInit(Index)) && 5420 cast<InitListExpr>(ILE->getInit(Index))->getNumInits() == 0)) { 5421 Diag(VDecl->getLocation(), diag::err_nonstatic_flexible_variable); 5422 VDecl->setInvalidDecl(); 5423 } 5424 } 5425 } 5426 5427 // Check any implicit conversions within the expression. 5428 CheckImplicitConversions(Init, VDecl->getLocation()); 5429 5430 Init = MaybeCreateExprWithCleanups(Init); 5431 // Attach the initializer to the decl. 5432 VDecl->setInit(Init); 5433 5434 CheckCompleteVariableDeclaration(VDecl); 5435} 5436 5437/// ActOnInitializerError - Given that there was an error parsing an 5438/// initializer for the given declaration, try to return to some form 5439/// of sanity. 5440void Sema::ActOnInitializerError(Decl *D) { 5441 // Our main concern here is re-establishing invariants like "a 5442 // variable's type is either dependent or complete". 5443 if (!D || D->isInvalidDecl()) return; 5444 5445 VarDecl *VD = dyn_cast<VarDecl>(D); 5446 if (!VD) return; 5447 5448 // Auto types are meaningless if we can't make sense of the initializer. 5449 if (ParsingInitForAutoVars.count(D)) { 5450 D->setInvalidDecl(); 5451 return; 5452 } 5453 5454 QualType Ty = VD->getType(); 5455 if (Ty->isDependentType()) return; 5456 5457 // Require a complete type. 5458 if (RequireCompleteType(VD->getLocation(), 5459 Context.getBaseElementType(Ty), 5460 diag::err_typecheck_decl_incomplete_type)) { 5461 VD->setInvalidDecl(); 5462 return; 5463 } 5464 5465 // Require an abstract type. 5466 if (RequireNonAbstractType(VD->getLocation(), Ty, 5467 diag::err_abstract_type_in_decl, 5468 AbstractVariableType)) { 5469 VD->setInvalidDecl(); 5470 return; 5471 } 5472 5473 // Don't bother complaining about constructors or destructors, 5474 // though. 5475} 5476 5477void Sema::ActOnUninitializedDecl(Decl *RealDecl, 5478 bool TypeMayContainAuto) { 5479 // If there is no declaration, there was an error parsing it. Just ignore it. 5480 if (RealDecl == 0) 5481 return; 5482 5483 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 5484 QualType Type = Var->getType(); 5485 5486 // C++0x [dcl.spec.auto]p3 5487 if (TypeMayContainAuto && Type->getContainedAutoType()) { 5488 Diag(Var->getLocation(), diag::err_auto_var_requires_init) 5489 << Var->getDeclName() << Type; 5490 Var->setInvalidDecl(); 5491 return; 5492 } 5493 5494 switch (Var->isThisDeclarationADefinition()) { 5495 case VarDecl::Definition: 5496 if (!Var->isStaticDataMember() || !Var->getAnyInitializer()) 5497 break; 5498 5499 // We have an out-of-line definition of a static data member 5500 // that has an in-class initializer, so we type-check this like 5501 // a declaration. 5502 // 5503 // Fall through 5504 5505 case VarDecl::DeclarationOnly: 5506 // It's only a declaration. 5507 5508 // Block scope. C99 6.7p7: If an identifier for an object is 5509 // declared with no linkage (C99 6.2.2p6), the type for the 5510 // object shall be complete. 5511 if (!Type->isDependentType() && Var->isLocalVarDecl() && 5512 !Var->getLinkage() && !Var->isInvalidDecl() && 5513 RequireCompleteType(Var->getLocation(), Type, 5514 diag::err_typecheck_decl_incomplete_type)) 5515 Var->setInvalidDecl(); 5516 5517 // Make sure that the type is not abstract. 5518 if (!Type->isDependentType() && !Var->isInvalidDecl() && 5519 RequireNonAbstractType(Var->getLocation(), Type, 5520 diag::err_abstract_type_in_decl, 5521 AbstractVariableType)) 5522 Var->setInvalidDecl(); 5523 return; 5524 5525 case VarDecl::TentativeDefinition: 5526 // File scope. C99 6.9.2p2: A declaration of an identifier for an 5527 // object that has file scope without an initializer, and without a 5528 // storage-class specifier or with the storage-class specifier "static", 5529 // constitutes a tentative definition. Note: A tentative definition with 5530 // external linkage is valid (C99 6.2.2p5). 5531 if (!Var->isInvalidDecl()) { 5532 if (const IncompleteArrayType *ArrayT 5533 = Context.getAsIncompleteArrayType(Type)) { 5534 if (RequireCompleteType(Var->getLocation(), 5535 ArrayT->getElementType(), 5536 diag::err_illegal_decl_array_incomplete_type)) 5537 Var->setInvalidDecl(); 5538 } else if (Var->getStorageClass() == SC_Static) { 5539 // C99 6.9.2p3: If the declaration of an identifier for an object is 5540 // a tentative definition and has internal linkage (C99 6.2.2p3), the 5541 // declared type shall not be an incomplete type. 5542 // NOTE: code such as the following 5543 // static struct s; 5544 // struct s { int a; }; 5545 // is accepted by gcc. Hence here we issue a warning instead of 5546 // an error and we do not invalidate the static declaration. 5547 // NOTE: to avoid multiple warnings, only check the first declaration. 5548 if (Var->getPreviousDeclaration() == 0) 5549 RequireCompleteType(Var->getLocation(), Type, 5550 diag::ext_typecheck_decl_incomplete_type); 5551 } 5552 } 5553 5554 // Record the tentative definition; we're done. 5555 if (!Var->isInvalidDecl()) 5556 TentativeDefinitions.push_back(Var); 5557 return; 5558 } 5559 5560 // Provide a specific diagnostic for uninitialized variable 5561 // definitions with incomplete array type. 5562 if (Type->isIncompleteArrayType()) { 5563 Diag(Var->getLocation(), 5564 diag::err_typecheck_incomplete_array_needs_initializer); 5565 Var->setInvalidDecl(); 5566 return; 5567 } 5568 5569 // Provide a specific diagnostic for uninitialized variable 5570 // definitions with reference type. 5571 if (Type->isReferenceType()) { 5572 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 5573 << Var->getDeclName() 5574 << SourceRange(Var->getLocation(), Var->getLocation()); 5575 Var->setInvalidDecl(); 5576 return; 5577 } 5578 5579 // Do not attempt to type-check the default initializer for a 5580 // variable with dependent type. 5581 if (Type->isDependentType()) 5582 return; 5583 5584 if (Var->isInvalidDecl()) 5585 return; 5586 5587 if (RequireCompleteType(Var->getLocation(), 5588 Context.getBaseElementType(Type), 5589 diag::err_typecheck_decl_incomplete_type)) { 5590 Var->setInvalidDecl(); 5591 return; 5592 } 5593 5594 // The variable can not have an abstract class type. 5595 if (RequireNonAbstractType(Var->getLocation(), Type, 5596 diag::err_abstract_type_in_decl, 5597 AbstractVariableType)) { 5598 Var->setInvalidDecl(); 5599 return; 5600 } 5601 5602 const RecordType *Record 5603 = Context.getBaseElementType(Type)->getAs<RecordType>(); 5604 if (Record && getLangOptions().CPlusPlus && !getLangOptions().CPlusPlus0x && 5605 cast<CXXRecordDecl>(Record->getDecl())->isPOD()) { 5606 // C++03 [dcl.init]p9: 5607 // If no initializer is specified for an object, and the 5608 // object is of (possibly cv-qualified) non-POD class type (or 5609 // array thereof), the object shall be default-initialized; if 5610 // the object is of const-qualified type, the underlying class 5611 // type shall have a user-declared default 5612 // constructor. Otherwise, if no initializer is specified for 5613 // a non- static object, the object and its subobjects, if 5614 // any, have an indeterminate initial value); if the object 5615 // or any of its subobjects are of const-qualified type, the 5616 // program is ill-formed. 5617 // C++0x [dcl.init]p11: 5618 // If no initializer is specified for an object, the object is 5619 // default-initialized; [...]. 5620 } else { 5621 // Check for jumps past the implicit initializer. C++0x 5622 // clarifies that this applies to a "variable with automatic 5623 // storage duration", not a "local variable". 5624 // C++0x [stmt.dcl]p3 5625 // A program that jumps from a point where a variable with automatic 5626 // storage duration is not ins cope to a point where it is in scope is 5627 // ill-formed unless the variable has scalar type, class type with a 5628 // trivial defautl constructor and a trivial destructor, a cv-qualified 5629 // version of one of these types, or an array of one of the preceding 5630 // types and is declared without an initializer. 5631 if (getLangOptions().CPlusPlus && Var->hasLocalStorage() && Record) { 5632 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record->getDecl()); 5633 if (!getLangOptions().CPlusPlus0x || 5634 !CXXRecord->hasTrivialDefaultConstructor() || 5635 !CXXRecord->hasTrivialDestructor()) 5636 getCurFunction()->setHasBranchProtectedScope(); 5637 } 5638 5639 InitializedEntity Entity = InitializedEntity::InitializeVariable(Var); 5640 InitializationKind Kind 5641 = InitializationKind::CreateDefault(Var->getLocation()); 5642 5643 InitializationSequence InitSeq(*this, Entity, Kind, 0, 0); 5644 ExprResult Init = InitSeq.Perform(*this, Entity, Kind, 5645 MultiExprArg(*this, 0, 0)); 5646 if (Init.isInvalid()) 5647 Var->setInvalidDecl(); 5648 else if (Init.get()) 5649 Var->setInit(MaybeCreateExprWithCleanups(Init.get())); 5650 } 5651 5652 CheckCompleteVariableDeclaration(Var); 5653 } 5654} 5655 5656void Sema::ActOnCXXForRangeDecl(Decl *D) { 5657 VarDecl *VD = dyn_cast<VarDecl>(D); 5658 if (!VD) { 5659 Diag(D->getLocation(), diag::err_for_range_decl_must_be_var); 5660 D->setInvalidDecl(); 5661 return; 5662 } 5663 5664 VD->setCXXForRangeDecl(true); 5665 5666 // for-range-declaration cannot be given a storage class specifier. 5667 int Error = -1; 5668 switch (VD->getStorageClassAsWritten()) { 5669 case SC_None: 5670 break; 5671 case SC_Extern: 5672 Error = 0; 5673 break; 5674 case SC_Static: 5675 Error = 1; 5676 break; 5677 case SC_PrivateExtern: 5678 Error = 2; 5679 break; 5680 case SC_Auto: 5681 Error = 3; 5682 break; 5683 case SC_Register: 5684 Error = 4; 5685 break; 5686 } 5687 // FIXME: constexpr isn't allowed here. 5688 //if (DS.isConstexprSpecified()) 5689 // Error = 5; 5690 if (Error != -1) { 5691 Diag(VD->getOuterLocStart(), diag::err_for_range_storage_class) 5692 << VD->getDeclName() << Error; 5693 D->setInvalidDecl(); 5694 } 5695} 5696 5697void Sema::CheckCompleteVariableDeclaration(VarDecl *var) { 5698 if (var->isInvalidDecl()) return; 5699 5700 // All the following checks are C++ only. 5701 if (!getLangOptions().CPlusPlus) return; 5702 5703 QualType baseType = Context.getBaseElementType(var->getType()); 5704 if (baseType->isDependentType()) return; 5705 5706 // __block variables might require us to capture a copy-initializer. 5707 if (var->hasAttr<BlocksAttr>()) { 5708 // It's currently invalid to ever have a __block variable with an 5709 // array type; should we diagnose that here? 5710 5711 // Regardless, we don't want to ignore array nesting when 5712 // constructing this copy. 5713 QualType type = var->getType(); 5714 5715 if (type->isStructureOrClassType()) { 5716 SourceLocation poi = var->getLocation(); 5717 Expr *varRef = new (Context) DeclRefExpr(var, type, VK_LValue, poi); 5718 ExprResult result = 5719 PerformCopyInitialization( 5720 InitializedEntity::InitializeBlock(poi, type, false), 5721 poi, Owned(varRef)); 5722 if (!result.isInvalid()) { 5723 result = MaybeCreateExprWithCleanups(result); 5724 Expr *init = result.takeAs<Expr>(); 5725 Context.setBlockVarCopyInits(var, init); 5726 } 5727 } 5728 } 5729 5730 // Check for global constructors. 5731 if (!var->getDeclContext()->isDependentContext() && 5732 var->hasGlobalStorage() && 5733 !var->isStaticLocal() && 5734 var->getInit() && 5735 !var->getInit()->isConstantInitializer(Context, 5736 baseType->isReferenceType())) 5737 Diag(var->getLocation(), diag::warn_global_constructor) 5738 << var->getInit()->getSourceRange(); 5739 5740 // Require the destructor. 5741 if (const RecordType *recordType = baseType->getAs<RecordType>()) 5742 FinalizeVarWithDestructor(var, recordType); 5743} 5744 5745/// FinalizeDeclaration - called by ParseDeclarationAfterDeclarator to perform 5746/// any semantic actions necessary after any initializer has been attached. 5747void 5748Sema::FinalizeDeclaration(Decl *ThisDecl) { 5749 // Note that we are no longer parsing the initializer for this declaration. 5750 ParsingInitForAutoVars.erase(ThisDecl); 5751} 5752 5753Sema::DeclGroupPtrTy 5754Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, 5755 Decl **Group, unsigned NumDecls) { 5756 llvm::SmallVector<Decl*, 8> Decls; 5757 5758 if (DS.isTypeSpecOwned()) 5759 Decls.push_back(DS.getRepAsDecl()); 5760 5761 for (unsigned i = 0; i != NumDecls; ++i) 5762 if (Decl *D = Group[i]) 5763 Decls.push_back(D); 5764 5765 return BuildDeclaratorGroup(Decls.data(), Decls.size(), 5766 DS.getTypeSpecType() == DeclSpec::TST_auto); 5767} 5768 5769/// BuildDeclaratorGroup - convert a list of declarations into a declaration 5770/// group, performing any necessary semantic checking. 5771Sema::DeclGroupPtrTy 5772Sema::BuildDeclaratorGroup(Decl **Group, unsigned NumDecls, 5773 bool TypeMayContainAuto) { 5774 // C++0x [dcl.spec.auto]p7: 5775 // If the type deduced for the template parameter U is not the same in each 5776 // deduction, the program is ill-formed. 5777 // FIXME: When initializer-list support is added, a distinction is needed 5778 // between the deduced type U and the deduced type which 'auto' stands for. 5779 // auto a = 0, b = { 1, 2, 3 }; 5780 // is legal because the deduced type U is 'int' in both cases. 5781 if (TypeMayContainAuto && NumDecls > 1) { 5782 QualType Deduced; 5783 CanQualType DeducedCanon; 5784 VarDecl *DeducedDecl = 0; 5785 for (unsigned i = 0; i != NumDecls; ++i) { 5786 if (VarDecl *D = dyn_cast<VarDecl>(Group[i])) { 5787 AutoType *AT = D->getType()->getContainedAutoType(); 5788 // Don't reissue diagnostics when instantiating a template. 5789 if (AT && D->isInvalidDecl()) 5790 break; 5791 if (AT && AT->isDeduced()) { 5792 QualType U = AT->getDeducedType(); 5793 CanQualType UCanon = Context.getCanonicalType(U); 5794 if (Deduced.isNull()) { 5795 Deduced = U; 5796 DeducedCanon = UCanon; 5797 DeducedDecl = D; 5798 } else if (DeducedCanon != UCanon) { 5799 Diag(D->getTypeSourceInfo()->getTypeLoc().getBeginLoc(), 5800 diag::err_auto_different_deductions) 5801 << Deduced << DeducedDecl->getDeclName() 5802 << U << D->getDeclName() 5803 << DeducedDecl->getInit()->getSourceRange() 5804 << D->getInit()->getSourceRange(); 5805 D->setInvalidDecl(); 5806 break; 5807 } 5808 } 5809 } 5810 } 5811 } 5812 5813 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, NumDecls)); 5814} 5815 5816 5817/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 5818/// to introduce parameters into function prototype scope. 5819Decl *Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 5820 const DeclSpec &DS = D.getDeclSpec(); 5821 5822 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 5823 VarDecl::StorageClass StorageClass = SC_None; 5824 VarDecl::StorageClass StorageClassAsWritten = SC_None; 5825 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 5826 StorageClass = SC_Register; 5827 StorageClassAsWritten = SC_Register; 5828 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 5829 Diag(DS.getStorageClassSpecLoc(), 5830 diag::err_invalid_storage_class_in_func_decl); 5831 D.getMutableDeclSpec().ClearStorageClassSpecs(); 5832 } 5833 5834 if (D.getDeclSpec().isThreadSpecified()) 5835 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 5836 5837 DiagnoseFunctionSpecifiers(D); 5838 5839 TagDecl *OwnedDecl = 0; 5840 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S, &OwnedDecl); 5841 QualType parmDeclType = TInfo->getType(); 5842 5843 if (getLangOptions().CPlusPlus) { 5844 // Check that there are no default arguments inside the type of this 5845 // parameter. 5846 CheckExtraCXXDefaultArguments(D); 5847 5848 if (OwnedDecl && OwnedDecl->isDefinition()) { 5849 // C++ [dcl.fct]p6: 5850 // Types shall not be defined in return or parameter types. 5851 Diag(OwnedDecl->getLocation(), diag::err_type_defined_in_param_type) 5852 << Context.getTypeDeclType(OwnedDecl); 5853 } 5854 5855 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 5856 if (D.getCXXScopeSpec().isSet()) { 5857 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 5858 << D.getCXXScopeSpec().getRange(); 5859 D.getCXXScopeSpec().clear(); 5860 } 5861 } 5862 5863 // Ensure we have a valid name 5864 IdentifierInfo *II = 0; 5865 if (D.hasName()) { 5866 II = D.getIdentifier(); 5867 if (!II) { 5868 Diag(D.getIdentifierLoc(), diag::err_bad_parameter_name) 5869 << GetNameForDeclarator(D).getName().getAsString(); 5870 D.setInvalidType(true); 5871 } 5872 } 5873 5874 // Check for redeclaration of parameters, e.g. int foo(int x, int x); 5875 if (II) { 5876 LookupResult R(*this, II, D.getIdentifierLoc(), LookupOrdinaryName, 5877 ForRedeclaration); 5878 LookupName(R, S); 5879 if (R.isSingleResult()) { 5880 NamedDecl *PrevDecl = R.getFoundDecl(); 5881 if (PrevDecl->isTemplateParameter()) { 5882 // Maybe we will complain about the shadowed template parameter. 5883 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 5884 // Just pretend that we didn't see the previous declaration. 5885 PrevDecl = 0; 5886 } else if (S->isDeclScope(PrevDecl)) { 5887 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 5888 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 5889 5890 // Recover by removing the name 5891 II = 0; 5892 D.SetIdentifier(0, D.getIdentifierLoc()); 5893 D.setInvalidType(true); 5894 } 5895 } 5896 } 5897 5898 // Temporarily put parameter variables in the translation unit, not 5899 // the enclosing context. This prevents them from accidentally 5900 // looking like class members in C++. 5901 ParmVarDecl *New = CheckParameter(Context.getTranslationUnitDecl(), 5902 D.getSourceRange().getBegin(), 5903 D.getIdentifierLoc(), II, 5904 parmDeclType, TInfo, 5905 StorageClass, StorageClassAsWritten); 5906 5907 if (D.isInvalidType()) 5908 New->setInvalidDecl(); 5909 5910 assert(S->isFunctionPrototypeScope()); 5911 assert(S->getFunctionPrototypeDepth() >= 1); 5912 New->setScopeInfo(S->getFunctionPrototypeDepth() - 1, 5913 S->getNextFunctionPrototypeIndex()); 5914 5915 // Add the parameter declaration into this scope. 5916 S->AddDecl(New); 5917 if (II) 5918 IdResolver.AddDecl(New); 5919 5920 ProcessDeclAttributes(S, New, D); 5921 5922 if (New->hasAttr<BlocksAttr>()) { 5923 Diag(New->getLocation(), diag::err_block_on_nonlocal); 5924 } 5925 return New; 5926} 5927 5928/// \brief Synthesizes a variable for a parameter arising from a 5929/// typedef. 5930ParmVarDecl *Sema::BuildParmVarDeclForTypedef(DeclContext *DC, 5931 SourceLocation Loc, 5932 QualType T) { 5933 /* FIXME: setting StartLoc == Loc. 5934 Would it be worth to modify callers so as to provide proper source 5935 location for the unnamed parameters, embedding the parameter's type? */ 5936 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, Loc, Loc, 0, 5937 T, Context.getTrivialTypeSourceInfo(T, Loc), 5938 SC_None, SC_None, 0); 5939 Param->setImplicit(); 5940 return Param; 5941} 5942 5943void Sema::DiagnoseUnusedParameters(ParmVarDecl * const *Param, 5944 ParmVarDecl * const *ParamEnd) { 5945 // Don't diagnose unused-parameter errors in template instantiations; we 5946 // will already have done so in the template itself. 5947 if (!ActiveTemplateInstantiations.empty()) 5948 return; 5949 5950 for (; Param != ParamEnd; ++Param) { 5951 if (!(*Param)->isUsed() && (*Param)->getDeclName() && 5952 !(*Param)->hasAttr<UnusedAttr>()) { 5953 Diag((*Param)->getLocation(), diag::warn_unused_parameter) 5954 << (*Param)->getDeclName(); 5955 } 5956 } 5957} 5958 5959void Sema::DiagnoseSizeOfParametersAndReturnValue(ParmVarDecl * const *Param, 5960 ParmVarDecl * const *ParamEnd, 5961 QualType ReturnTy, 5962 NamedDecl *D) { 5963 if (LangOpts.NumLargeByValueCopy == 0) // No check. 5964 return; 5965 5966 // Warn if the return value is pass-by-value and larger than the specified 5967 // threshold. 5968 if (ReturnTy->isPODType()) { 5969 unsigned Size = Context.getTypeSizeInChars(ReturnTy).getQuantity(); 5970 if (Size > LangOpts.NumLargeByValueCopy) 5971 Diag(D->getLocation(), diag::warn_return_value_size) 5972 << D->getDeclName() << Size; 5973 } 5974 5975 // Warn if any parameter is pass-by-value and larger than the specified 5976 // threshold. 5977 for (; Param != ParamEnd; ++Param) { 5978 QualType T = (*Param)->getType(); 5979 if (!T->isPODType()) 5980 continue; 5981 unsigned Size = Context.getTypeSizeInChars(T).getQuantity(); 5982 if (Size > LangOpts.NumLargeByValueCopy) 5983 Diag((*Param)->getLocation(), diag::warn_parameter_size) 5984 << (*Param)->getDeclName() << Size; 5985 } 5986} 5987 5988ParmVarDecl *Sema::CheckParameter(DeclContext *DC, SourceLocation StartLoc, 5989 SourceLocation NameLoc, IdentifierInfo *Name, 5990 QualType T, TypeSourceInfo *TSInfo, 5991 VarDecl::StorageClass StorageClass, 5992 VarDecl::StorageClass StorageClassAsWritten) { 5993 ParmVarDecl *New = ParmVarDecl::Create(Context, DC, StartLoc, NameLoc, Name, 5994 adjustParameterType(T), TSInfo, 5995 StorageClass, StorageClassAsWritten, 5996 0); 5997 5998 // Parameters can not be abstract class types. 5999 // For record types, this is done by the AbstractClassUsageDiagnoser once 6000 // the class has been completely parsed. 6001 if (!CurContext->isRecord() && 6002 RequireNonAbstractType(NameLoc, T, diag::err_abstract_type_in_decl, 6003 AbstractParamType)) 6004 New->setInvalidDecl(); 6005 6006 // Parameter declarators cannot be interface types. All ObjC objects are 6007 // passed by reference. 6008 if (T->isObjCObjectType()) { 6009 Diag(NameLoc, 6010 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T; 6011 New->setInvalidDecl(); 6012 } 6013 6014 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage 6015 // duration shall not be qualified by an address-space qualifier." 6016 // Since all parameters have automatic store duration, they can not have 6017 // an address space. 6018 if (T.getAddressSpace() != 0) { 6019 Diag(NameLoc, diag::err_arg_with_address_space); 6020 New->setInvalidDecl(); 6021 } 6022 6023 return New; 6024} 6025 6026void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 6027 SourceLocation LocAfterDecls) { 6028 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 6029 6030 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 6031 // for a K&R function. 6032 if (!FTI.hasPrototype) { 6033 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 6034 --i; 6035 if (FTI.ArgInfo[i].Param == 0) { 6036 llvm::SmallString<256> Code; 6037 llvm::raw_svector_ostream(Code) << " int " 6038 << FTI.ArgInfo[i].Ident->getName() 6039 << ";\n"; 6040 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 6041 << FTI.ArgInfo[i].Ident 6042 << FixItHint::CreateInsertion(LocAfterDecls, Code.str()); 6043 6044 // Implicitly declare the argument as type 'int' for lack of a better 6045 // type. 6046 AttributeFactory attrs; 6047 DeclSpec DS(attrs); 6048 const char* PrevSpec; // unused 6049 unsigned DiagID; // unused 6050 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 6051 PrevSpec, DiagID); 6052 Declarator ParamD(DS, Declarator::KNRTypeListContext); 6053 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 6054 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 6055 } 6056 } 6057 } 6058} 6059 6060Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, 6061 Declarator &D) { 6062 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 6063 assert(D.isFunctionDeclarator() && "Not a function declarator!"); 6064 Scope *ParentScope = FnBodyScope->getParent(); 6065 6066 Decl *DP = HandleDeclarator(ParentScope, D, 6067 MultiTemplateParamsArg(*this), 6068 /*IsFunctionDefinition=*/true); 6069 return ActOnStartOfFunctionDef(FnBodyScope, DP); 6070} 6071 6072static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD) { 6073 // Don't warn about invalid declarations. 6074 if (FD->isInvalidDecl()) 6075 return false; 6076 6077 // Or declarations that aren't global. 6078 if (!FD->isGlobal()) 6079 return false; 6080 6081 // Don't warn about C++ member functions. 6082 if (isa<CXXMethodDecl>(FD)) 6083 return false; 6084 6085 // Don't warn about 'main'. 6086 if (FD->isMain()) 6087 return false; 6088 6089 // Don't warn about inline functions. 6090 if (FD->isInlined()) 6091 return false; 6092 6093 // Don't warn about function templates. 6094 if (FD->getDescribedFunctionTemplate()) 6095 return false; 6096 6097 // Don't warn about function template specializations. 6098 if (FD->isFunctionTemplateSpecialization()) 6099 return false; 6100 6101 bool MissingPrototype = true; 6102 for (const FunctionDecl *Prev = FD->getPreviousDeclaration(); 6103 Prev; Prev = Prev->getPreviousDeclaration()) { 6104 // Ignore any declarations that occur in function or method 6105 // scope, because they aren't visible from the header. 6106 if (Prev->getDeclContext()->isFunctionOrMethod()) 6107 continue; 6108 6109 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 6110 break; 6111 } 6112 6113 return MissingPrototype; 6114} 6115 6116void Sema::CheckForFunctionRedefinition(FunctionDecl *FD) { 6117 // Don't complain if we're in GNU89 mode and the previous definition 6118 // was an extern inline function. 6119 const FunctionDecl *Definition; 6120 if (FD->isDefined(Definition) && 6121 !canRedefineFunction(Definition, getLangOptions())) { 6122 if (getLangOptions().GNUMode && Definition->isInlineSpecified() && 6123 Definition->getStorageClass() == SC_Extern) 6124 Diag(FD->getLocation(), diag::err_redefinition_extern_inline) 6125 << FD->getDeclName() << getLangOptions().CPlusPlus; 6126 else 6127 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 6128 Diag(Definition->getLocation(), diag::note_previous_definition); 6129 } 6130} 6131 6132Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Decl *D) { 6133 // Clear the last template instantiation error context. 6134 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation(); 6135 6136 if (!D) 6137 return D; 6138 FunctionDecl *FD = 0; 6139 6140 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(D)) 6141 FD = FunTmpl->getTemplatedDecl(); 6142 else 6143 FD = cast<FunctionDecl>(D); 6144 6145 // Enter a new function scope 6146 PushFunctionScope(); 6147 6148 // See if this is a redefinition. 6149 if (!FD->isLateTemplateParsed()) 6150 CheckForFunctionRedefinition(FD); 6151 6152 // Builtin functions cannot be defined. 6153 if (unsigned BuiltinID = FD->getBuiltinID()) { 6154 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 6155 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 6156 FD->setInvalidDecl(); 6157 } 6158 } 6159 6160 // The return type of a function definition must be complete 6161 // (C99 6.9.1p3, C++ [dcl.fct]p6). 6162 QualType ResultType = FD->getResultType(); 6163 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 6164 !FD->isInvalidDecl() && 6165 RequireCompleteType(FD->getLocation(), ResultType, 6166 diag::err_func_def_incomplete_result)) 6167 FD->setInvalidDecl(); 6168 6169 // GNU warning -Wmissing-prototypes: 6170 // Warn if a global function is defined without a previous 6171 // prototype declaration. This warning is issued even if the 6172 // definition itself provides a prototype. The aim is to detect 6173 // global functions that fail to be declared in header files. 6174 if (ShouldWarnAboutMissingPrototype(FD)) 6175 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 6176 6177 if (FnBodyScope) 6178 PushDeclContext(FnBodyScope, FD); 6179 6180 // Check the validity of our function parameters 6181 CheckParmsForFunctionDef(FD->param_begin(), FD->param_end(), 6182 /*CheckParameterNames=*/true); 6183 6184 // Introduce our parameters into the function scope 6185 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 6186 ParmVarDecl *Param = FD->getParamDecl(p); 6187 Param->setOwningFunction(FD); 6188 6189 // If this has an identifier, add it to the scope stack. 6190 if (Param->getIdentifier() && FnBodyScope) { 6191 CheckShadow(FnBodyScope, Param); 6192 6193 PushOnScopeChains(Param, FnBodyScope); 6194 } 6195 } 6196 6197 // Checking attributes of current function definition 6198 // dllimport attribute. 6199 DLLImportAttr *DA = FD->getAttr<DLLImportAttr>(); 6200 if (DA && (!FD->getAttr<DLLExportAttr>())) { 6201 // dllimport attribute cannot be directly applied to definition. 6202 // Microsoft accepts dllimport for functions defined within class scope. 6203 if (!DA->isInherited() && 6204 !(LangOpts.Microsoft && FD->getLexicalDeclContext()->isRecord())) { 6205 Diag(FD->getLocation(), 6206 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 6207 << "dllimport"; 6208 FD->setInvalidDecl(); 6209 return FD; 6210 } 6211 6212 // Visual C++ appears to not think this is an issue, so only issue 6213 // a warning when Microsoft extensions are disabled. 6214 if (!LangOpts.Microsoft) { 6215 // If a symbol previously declared dllimport is later defined, the 6216 // attribute is ignored in subsequent references, and a warning is 6217 // emitted. 6218 Diag(FD->getLocation(), 6219 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 6220 << FD->getName() << "dllimport"; 6221 } 6222 } 6223 return FD; 6224} 6225 6226/// \brief Given the set of return statements within a function body, 6227/// compute the variables that are subject to the named return value 6228/// optimization. 6229/// 6230/// Each of the variables that is subject to the named return value 6231/// optimization will be marked as NRVO variables in the AST, and any 6232/// return statement that has a marked NRVO variable as its NRVO candidate can 6233/// use the named return value optimization. 6234/// 6235/// This function applies a very simplistic algorithm for NRVO: if every return 6236/// statement in the function has the same NRVO candidate, that candidate is 6237/// the NRVO variable. 6238/// 6239/// FIXME: Employ a smarter algorithm that accounts for multiple return 6240/// statements and the lifetimes of the NRVO candidates. We should be able to 6241/// find a maximal set of NRVO variables. 6242static void ComputeNRVO(Stmt *Body, FunctionScopeInfo *Scope) { 6243 ReturnStmt **Returns = Scope->Returns.data(); 6244 6245 const VarDecl *NRVOCandidate = 0; 6246 for (unsigned I = 0, E = Scope->Returns.size(); I != E; ++I) { 6247 if (!Returns[I]->getNRVOCandidate()) 6248 return; 6249 6250 if (!NRVOCandidate) 6251 NRVOCandidate = Returns[I]->getNRVOCandidate(); 6252 else if (NRVOCandidate != Returns[I]->getNRVOCandidate()) 6253 return; 6254 } 6255 6256 if (NRVOCandidate) 6257 const_cast<VarDecl*>(NRVOCandidate)->setNRVOVariable(true); 6258} 6259 6260Decl *Sema::ActOnFinishFunctionBody(Decl *D, Stmt *BodyArg) { 6261 return ActOnFinishFunctionBody(D, move(BodyArg), false); 6262} 6263 6264Decl *Sema::ActOnFinishFunctionBody(Decl *dcl, Stmt *Body, 6265 bool IsInstantiation) { 6266 FunctionDecl *FD = 0; 6267 FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl); 6268 if (FunTmpl) 6269 FD = FunTmpl->getTemplatedDecl(); 6270 else 6271 FD = dyn_cast_or_null<FunctionDecl>(dcl); 6272 6273 sema::AnalysisBasedWarnings::Policy WP = AnalysisWarnings.getDefaultPolicy(); 6274 sema::AnalysisBasedWarnings::Policy *ActivePolicy = 0; 6275 6276 if (FD) { 6277 FD->setBody(Body); 6278 if (FD->isMain()) { 6279 // C and C++ allow for main to automagically return 0. 6280 // Implements C++ [basic.start.main]p5 and C99 5.1.2.2.3. 6281 FD->setHasImplicitReturnZero(true); 6282 WP.disableCheckFallThrough(); 6283 } 6284 6285 // MSVC permits the use of pure specifier (=0) on function definition, 6286 // defined at class scope, warn about this non standard construct. 6287 if (getLangOptions().Microsoft && FD->isPure()) 6288 Diag(FD->getLocation(), diag::warn_pure_function_definition); 6289 6290 if (!FD->isInvalidDecl()) { 6291 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end()); 6292 DiagnoseSizeOfParametersAndReturnValue(FD->param_begin(), FD->param_end(), 6293 FD->getResultType(), FD); 6294 6295 // If this is a constructor, we need a vtable. 6296 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(FD)) 6297 MarkVTableUsed(FD->getLocation(), Constructor->getParent()); 6298 6299 ComputeNRVO(Body, getCurFunction()); 6300 } 6301 6302 assert(FD == getCurFunctionDecl() && "Function parsing confused"); 6303 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 6304 assert(MD == getCurMethodDecl() && "Method parsing confused"); 6305 MD->setBody(Body); 6306 if (Body) 6307 MD->setEndLoc(Body->getLocEnd()); 6308 if (!MD->isInvalidDecl()) { 6309 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end()); 6310 DiagnoseSizeOfParametersAndReturnValue(MD->param_begin(), MD->param_end(), 6311 MD->getResultType(), MD); 6312 } 6313 } else { 6314 return 0; 6315 } 6316 6317 // Verify and clean out per-function state. 6318 if (Body) { 6319 // C++ constructors that have function-try-blocks can't have return 6320 // statements in the handlers of that block. (C++ [except.handle]p14) 6321 // Verify this. 6322 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body)) 6323 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); 6324 6325 // Verify that that gotos and switch cases don't jump into scopes illegally. 6326 // Verify that that gotos and switch cases don't jump into scopes illegally. 6327 if (getCurFunction()->NeedsScopeChecking() && 6328 !dcl->isInvalidDecl() && 6329 !hasAnyErrorsInThisFunction()) 6330 DiagnoseInvalidJumps(Body); 6331 6332 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) { 6333 if (!Destructor->getParent()->isDependentType()) 6334 CheckDestructor(Destructor); 6335 6336 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 6337 Destructor->getParent()); 6338 } 6339 6340 // If any errors have occurred, clear out any temporaries that may have 6341 // been leftover. This ensures that these temporaries won't be picked up for 6342 // deletion in some later function. 6343 if (PP.getDiagnostics().hasErrorOccurred() || 6344 PP.getDiagnostics().getSuppressAllDiagnostics()) 6345 ExprTemporaries.clear(); 6346 else if (!isa<FunctionTemplateDecl>(dcl)) { 6347 // Since the body is valid, issue any analysis-based warnings that are 6348 // enabled. 6349 ActivePolicy = &WP; 6350 } 6351 6352 assert(ExprTemporaries.empty() && "Leftover temporaries in function"); 6353 } 6354 6355 if (!IsInstantiation) 6356 PopDeclContext(); 6357 6358 PopFunctionOrBlockScope(ActivePolicy, dcl); 6359 6360 // If any errors have occurred, clear out any temporaries that may have 6361 // been leftover. This ensures that these temporaries won't be picked up for 6362 // deletion in some later function. 6363 if (getDiagnostics().hasErrorOccurred()) 6364 ExprTemporaries.clear(); 6365 6366 return dcl; 6367} 6368 6369/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 6370/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 6371NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 6372 IdentifierInfo &II, Scope *S) { 6373 // Before we produce a declaration for an implicitly defined 6374 // function, see whether there was a locally-scoped declaration of 6375 // this name as a function or variable. If so, use that 6376 // (non-visible) declaration, and complain about it. 6377 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 6378 = LocallyScopedExternalDecls.find(&II); 6379 if (Pos != LocallyScopedExternalDecls.end()) { 6380 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 6381 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 6382 return Pos->second; 6383 } 6384 6385 // Extension in C99. Legal in C90, but warn about it. 6386 if (II.getName().startswith("__builtin_")) 6387 Diag(Loc, diag::warn_builtin_unknown) << &II; 6388 else if (getLangOptions().C99) 6389 Diag(Loc, diag::ext_implicit_function_decl) << &II; 6390 else 6391 Diag(Loc, diag::warn_implicit_function_decl) << &II; 6392 6393 // Set a Declarator for the implicit definition: int foo(); 6394 const char *Dummy; 6395 AttributeFactory attrFactory; 6396 DeclSpec DS(attrFactory); 6397 unsigned DiagID; 6398 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID); 6399 (void)Error; // Silence warning. 6400 assert(!Error && "Error setting up implicit decl!"); 6401 Declarator D(DS, Declarator::BlockContext); 6402 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0, 6403 0, 0, true, SourceLocation(), 6404 EST_None, SourceLocation(), 6405 0, 0, 0, 0, Loc, Loc, D), 6406 DS.getAttributes(), 6407 SourceLocation()); 6408 D.SetIdentifier(&II, Loc); 6409 6410 // Insert this function into translation-unit scope. 6411 6412 DeclContext *PrevDC = CurContext; 6413 CurContext = Context.getTranslationUnitDecl(); 6414 6415 FunctionDecl *FD = dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D)); 6416 FD->setImplicit(); 6417 6418 CurContext = PrevDC; 6419 6420 AddKnownFunctionAttributes(FD); 6421 6422 return FD; 6423} 6424 6425/// \brief Adds any function attributes that we know a priori based on 6426/// the declaration of this function. 6427/// 6428/// These attributes can apply both to implicitly-declared builtins 6429/// (like __builtin___printf_chk) or to library-declared functions 6430/// like NSLog or printf. 6431void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 6432 if (FD->isInvalidDecl()) 6433 return; 6434 6435 // If this is a built-in function, map its builtin attributes to 6436 // actual attributes. 6437 if (unsigned BuiltinID = FD->getBuiltinID()) { 6438 // Handle printf-formatting attributes. 6439 unsigned FormatIdx; 6440 bool HasVAListArg; 6441 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 6442 if (!FD->getAttr<FormatAttr>()) 6443 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 6444 "printf", FormatIdx+1, 6445 HasVAListArg ? 0 : FormatIdx+2)); 6446 } 6447 if (Context.BuiltinInfo.isScanfLike(BuiltinID, FormatIdx, 6448 HasVAListArg)) { 6449 if (!FD->getAttr<FormatAttr>()) 6450 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 6451 "scanf", FormatIdx+1, 6452 HasVAListArg ? 0 : FormatIdx+2)); 6453 } 6454 6455 // Mark const if we don't care about errno and that is the only 6456 // thing preventing the function from being const. This allows 6457 // IRgen to use LLVM intrinsics for such functions. 6458 if (!getLangOptions().MathErrno && 6459 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 6460 if (!FD->getAttr<ConstAttr>()) 6461 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 6462 } 6463 6464 if (Context.BuiltinInfo.isNoThrow(BuiltinID)) 6465 FD->addAttr(::new (Context) NoThrowAttr(FD->getLocation(), Context)); 6466 if (Context.BuiltinInfo.isConst(BuiltinID)) 6467 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 6468 } 6469 6470 IdentifierInfo *Name = FD->getIdentifier(); 6471 if (!Name) 6472 return; 6473 if ((!getLangOptions().CPlusPlus && 6474 FD->getDeclContext()->isTranslationUnit()) || 6475 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 6476 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 6477 LinkageSpecDecl::lang_c)) { 6478 // Okay: this could be a libc/libm/Objective-C function we know 6479 // about. 6480 } else 6481 return; 6482 6483 if (Name->isStr("NSLog") || Name->isStr("NSLogv")) { 6484 // FIXME: NSLog and NSLogv should be target specific 6485 if (const FormatAttr *Format = FD->getAttr<FormatAttr>()) { 6486 // FIXME: We known better than our headers. 6487 const_cast<FormatAttr *>(Format)->setType(Context, "printf"); 6488 } else 6489 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 6490 "printf", 1, 6491 Name->isStr("NSLogv") ? 0 : 2)); 6492 } else if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { 6493 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be 6494 // target-specific builtins, perhaps? 6495 if (!FD->getAttr<FormatAttr>()) 6496 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 6497 "printf", 2, 6498 Name->isStr("vasprintf") ? 0 : 3)); 6499 } 6500} 6501 6502TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 6503 TypeSourceInfo *TInfo) { 6504 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 6505 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 6506 6507 if (!TInfo) { 6508 assert(D.isInvalidType() && "no declarator info for valid type"); 6509 TInfo = Context.getTrivialTypeSourceInfo(T); 6510 } 6511 6512 // Scope manipulation handled by caller. 6513 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 6514 D.getSourceRange().getBegin(), 6515 D.getIdentifierLoc(), 6516 D.getIdentifier(), 6517 TInfo); 6518 6519 // Bail out immediately if we have an invalid declaration. 6520 if (D.isInvalidType()) { 6521 NewTD->setInvalidDecl(); 6522 return NewTD; 6523 } 6524 6525 // C++ [dcl.typedef]p8: 6526 // If the typedef declaration defines an unnamed class (or 6527 // enum), the first typedef-name declared by the declaration 6528 // to be that class type (or enum type) is used to denote the 6529 // class type (or enum type) for linkage purposes only. 6530 // We need to check whether the type was declared in the declaration. 6531 switch (D.getDeclSpec().getTypeSpecType()) { 6532 case TST_enum: 6533 case TST_struct: 6534 case TST_union: 6535 case TST_class: { 6536 TagDecl *tagFromDeclSpec = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 6537 6538 // Do nothing if the tag is not anonymous or already has an 6539 // associated typedef (from an earlier typedef in this decl group). 6540 if (tagFromDeclSpec->getIdentifier()) break; 6541 if (tagFromDeclSpec->getTypedefNameForAnonDecl()) break; 6542 6543 // A well-formed anonymous tag must always be a TUK_Definition. 6544 assert(tagFromDeclSpec->isThisDeclarationADefinition()); 6545 6546 // The type must match the tag exactly; no qualifiers allowed. 6547 if (!Context.hasSameType(T, Context.getTagDeclType(tagFromDeclSpec))) 6548 break; 6549 6550 // Otherwise, set this is the anon-decl typedef for the tag. 6551 tagFromDeclSpec->setTypedefNameForAnonDecl(NewTD); 6552 break; 6553 } 6554 6555 default: 6556 break; 6557 } 6558 6559 return NewTD; 6560} 6561 6562 6563/// \brief Determine whether a tag with a given kind is acceptable 6564/// as a redeclaration of the given tag declaration. 6565/// 6566/// \returns true if the new tag kind is acceptable, false otherwise. 6567bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, 6568 TagTypeKind NewTag, 6569 SourceLocation NewTagLoc, 6570 const IdentifierInfo &Name) { 6571 // C++ [dcl.type.elab]p3: 6572 // The class-key or enum keyword present in the 6573 // elaborated-type-specifier shall agree in kind with the 6574 // declaration to which the name in the elaborated-type-specifier 6575 // refers. This rule also applies to the form of 6576 // elaborated-type-specifier that declares a class-name or 6577 // friend class since it can be construed as referring to the 6578 // definition of the class. Thus, in any 6579 // elaborated-type-specifier, the enum keyword shall be used to 6580 // refer to an enumeration (7.2), the union class-key shall be 6581 // used to refer to a union (clause 9), and either the class or 6582 // struct class-key shall be used to refer to a class (clause 9) 6583 // declared using the class or struct class-key. 6584 TagTypeKind OldTag = Previous->getTagKind(); 6585 if (OldTag == NewTag) 6586 return true; 6587 6588 if ((OldTag == TTK_Struct || OldTag == TTK_Class) && 6589 (NewTag == TTK_Struct || NewTag == TTK_Class)) { 6590 // Warn about the struct/class tag mismatch. 6591 bool isTemplate = false; 6592 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) 6593 isTemplate = Record->getDescribedClassTemplate(); 6594 6595 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 6596 << (NewTag == TTK_Class) 6597 << isTemplate << &Name 6598 << FixItHint::CreateReplacement(SourceRange(NewTagLoc), 6599 OldTag == TTK_Class? "class" : "struct"); 6600 Diag(Previous->getLocation(), diag::note_previous_use); 6601 return true; 6602 } 6603 return false; 6604} 6605 6606/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 6607/// former case, Name will be non-null. In the later case, Name will be null. 6608/// TagSpec indicates what kind of tag this is. TUK indicates whether this is a 6609/// reference/declaration/definition of a tag. 6610Decl *Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK, 6611 SourceLocation KWLoc, CXXScopeSpec &SS, 6612 IdentifierInfo *Name, SourceLocation NameLoc, 6613 AttributeList *Attr, AccessSpecifier AS, 6614 MultiTemplateParamsArg TemplateParameterLists, 6615 bool &OwnedDecl, bool &IsDependent, 6616 bool ScopedEnum, bool ScopedEnumUsesClassTag, 6617 TypeResult UnderlyingType) { 6618 // If this is not a definition, it must have a name. 6619 assert((Name != 0 || TUK == TUK_Definition) && 6620 "Nameless record must be a definition!"); 6621 assert(TemplateParameterLists.size() == 0 || TUK != TUK_Reference); 6622 6623 OwnedDecl = false; 6624 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 6625 6626 // FIXME: Check explicit specializations more carefully. 6627 bool isExplicitSpecialization = false; 6628 bool Invalid = false; 6629 6630 // We only need to do this matching if we have template parameters 6631 // or a scope specifier, which also conveniently avoids this work 6632 // for non-C++ cases. 6633 if (TemplateParameterLists.size() > 0 || 6634 (SS.isNotEmpty() && TUK != TUK_Reference)) { 6635 if (TemplateParameterList *TemplateParams 6636 = MatchTemplateParametersToScopeSpecifier(KWLoc, NameLoc, SS, 6637 TemplateParameterLists.get(), 6638 TemplateParameterLists.size(), 6639 TUK == TUK_Friend, 6640 isExplicitSpecialization, 6641 Invalid)) { 6642 if (TemplateParams->size() > 0) { 6643 // This is a declaration or definition of a class template (which may 6644 // be a member of another template). 6645 6646 if (Invalid) 6647 return 0; 6648 6649 OwnedDecl = false; 6650 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc, 6651 SS, Name, NameLoc, Attr, 6652 TemplateParams, AS, 6653 TemplateParameterLists.size() - 1, 6654 (TemplateParameterList**) TemplateParameterLists.release()); 6655 return Result.get(); 6656 } else { 6657 // The "template<>" header is extraneous. 6658 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 6659 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 6660 isExplicitSpecialization = true; 6661 } 6662 } 6663 } 6664 6665 // Figure out the underlying type if this a enum declaration. We need to do 6666 // this early, because it's needed to detect if this is an incompatible 6667 // redeclaration. 6668 llvm::PointerUnion<const Type*, TypeSourceInfo*> EnumUnderlying; 6669 6670 if (Kind == TTK_Enum) { 6671 if (UnderlyingType.isInvalid() || (!UnderlyingType.get() && ScopedEnum)) 6672 // No underlying type explicitly specified, or we failed to parse the 6673 // type, default to int. 6674 EnumUnderlying = Context.IntTy.getTypePtr(); 6675 else if (UnderlyingType.get()) { 6676 // C++0x 7.2p2: The type-specifier-seq of an enum-base shall name an 6677 // integral type; any cv-qualification is ignored. 6678 TypeSourceInfo *TI = 0; 6679 QualType T = GetTypeFromParser(UnderlyingType.get(), &TI); 6680 EnumUnderlying = TI; 6681 6682 SourceLocation UnderlyingLoc = TI->getTypeLoc().getBeginLoc(); 6683 6684 if (!T->isDependentType() && !T->isIntegralType(Context)) { 6685 Diag(UnderlyingLoc, diag::err_enum_invalid_underlying) 6686 << T; 6687 // Recover by falling back to int. 6688 EnumUnderlying = Context.IntTy.getTypePtr(); 6689 } 6690 6691 if (DiagnoseUnexpandedParameterPack(UnderlyingLoc, TI, 6692 UPPC_FixedUnderlyingType)) 6693 EnumUnderlying = Context.IntTy.getTypePtr(); 6694 6695 } else if (getLangOptions().Microsoft) 6696 // Microsoft enums are always of int type. 6697 EnumUnderlying = Context.IntTy.getTypePtr(); 6698 } 6699 6700 DeclContext *SearchDC = CurContext; 6701 DeclContext *DC = CurContext; 6702 bool isStdBadAlloc = false; 6703 6704 RedeclarationKind Redecl = ForRedeclaration; 6705 if (TUK == TUK_Friend || TUK == TUK_Reference) 6706 Redecl = NotForRedeclaration; 6707 6708 LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl); 6709 6710 if (Name && SS.isNotEmpty()) { 6711 // We have a nested-name tag ('struct foo::bar'). 6712 6713 // Check for invalid 'foo::'. 6714 if (SS.isInvalid()) { 6715 Name = 0; 6716 goto CreateNewDecl; 6717 } 6718 6719 // If this is a friend or a reference to a class in a dependent 6720 // context, don't try to make a decl for it. 6721 if (TUK == TUK_Friend || TUK == TUK_Reference) { 6722 DC = computeDeclContext(SS, false); 6723 if (!DC) { 6724 IsDependent = true; 6725 return 0; 6726 } 6727 } else { 6728 DC = computeDeclContext(SS, true); 6729 if (!DC) { 6730 Diag(SS.getRange().getBegin(), diag::err_dependent_nested_name_spec) 6731 << SS.getRange(); 6732 return 0; 6733 } 6734 } 6735 6736 if (RequireCompleteDeclContext(SS, DC)) 6737 return 0; 6738 6739 SearchDC = DC; 6740 // Look-up name inside 'foo::'. 6741 LookupQualifiedName(Previous, DC); 6742 6743 if (Previous.isAmbiguous()) 6744 return 0; 6745 6746 if (Previous.empty()) { 6747 // Name lookup did not find anything. However, if the 6748 // nested-name-specifier refers to the current instantiation, 6749 // and that current instantiation has any dependent base 6750 // classes, we might find something at instantiation time: treat 6751 // this as a dependent elaborated-type-specifier. 6752 // But this only makes any sense for reference-like lookups. 6753 if (Previous.wasNotFoundInCurrentInstantiation() && 6754 (TUK == TUK_Reference || TUK == TUK_Friend)) { 6755 IsDependent = true; 6756 return 0; 6757 } 6758 6759 // A tag 'foo::bar' must already exist. 6760 Diag(NameLoc, diag::err_not_tag_in_scope) 6761 << Kind << Name << DC << SS.getRange(); 6762 Name = 0; 6763 Invalid = true; 6764 goto CreateNewDecl; 6765 } 6766 } else if (Name) { 6767 // If this is a named struct, check to see if there was a previous forward 6768 // declaration or definition. 6769 // FIXME: We're looking into outer scopes here, even when we 6770 // shouldn't be. Doing so can result in ambiguities that we 6771 // shouldn't be diagnosing. 6772 LookupName(Previous, S); 6773 6774 if (Previous.isAmbiguous() && 6775 (TUK == TUK_Definition || TUK == TUK_Declaration)) { 6776 LookupResult::Filter F = Previous.makeFilter(); 6777 while (F.hasNext()) { 6778 NamedDecl *ND = F.next(); 6779 if (ND->getDeclContext()->getRedeclContext() != SearchDC) 6780 F.erase(); 6781 } 6782 F.done(); 6783 } 6784 6785 // Note: there used to be some attempt at recovery here. 6786 if (Previous.isAmbiguous()) 6787 return 0; 6788 6789 if (!getLangOptions().CPlusPlus && TUK != TUK_Reference) { 6790 // FIXME: This makes sure that we ignore the contexts associated 6791 // with C structs, unions, and enums when looking for a matching 6792 // tag declaration or definition. See the similar lookup tweak 6793 // in Sema::LookupName; is there a better way to deal with this? 6794 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 6795 SearchDC = SearchDC->getParent(); 6796 } 6797 } else if (S->isFunctionPrototypeScope()) { 6798 // If this is an enum declaration in function prototype scope, set its 6799 // initial context to the translation unit. 6800 SearchDC = Context.getTranslationUnitDecl(); 6801 } 6802 6803 if (Previous.isSingleResult() && 6804 Previous.getFoundDecl()->isTemplateParameter()) { 6805 // Maybe we will complain about the shadowed template parameter. 6806 DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl()); 6807 // Just pretend that we didn't see the previous declaration. 6808 Previous.clear(); 6809 } 6810 6811 if (getLangOptions().CPlusPlus && Name && DC && StdNamespace && 6812 DC->Equals(getStdNamespace()) && Name->isStr("bad_alloc")) { 6813 // This is a declaration of or a reference to "std::bad_alloc". 6814 isStdBadAlloc = true; 6815 6816 if (Previous.empty() && StdBadAlloc) { 6817 // std::bad_alloc has been implicitly declared (but made invisible to 6818 // name lookup). Fill in this implicit declaration as the previous 6819 // declaration, so that the declarations get chained appropriately. 6820 Previous.addDecl(getStdBadAlloc()); 6821 } 6822 } 6823 6824 // If we didn't find a previous declaration, and this is a reference 6825 // (or friend reference), move to the correct scope. In C++, we 6826 // also need to do a redeclaration lookup there, just in case 6827 // there's a shadow friend decl. 6828 if (Name && Previous.empty() && 6829 (TUK == TUK_Reference || TUK == TUK_Friend)) { 6830 if (Invalid) goto CreateNewDecl; 6831 assert(SS.isEmpty()); 6832 6833 if (TUK == TUK_Reference) { 6834 // C++ [basic.scope.pdecl]p5: 6835 // -- for an elaborated-type-specifier of the form 6836 // 6837 // class-key identifier 6838 // 6839 // if the elaborated-type-specifier is used in the 6840 // decl-specifier-seq or parameter-declaration-clause of a 6841 // function defined in namespace scope, the identifier is 6842 // declared as a class-name in the namespace that contains 6843 // the declaration; otherwise, except as a friend 6844 // declaration, the identifier is declared in the smallest 6845 // non-class, non-function-prototype scope that contains the 6846 // declaration. 6847 // 6848 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 6849 // C structs and unions. 6850 // 6851 // It is an error in C++ to declare (rather than define) an enum 6852 // type, including via an elaborated type specifier. We'll 6853 // diagnose that later; for now, declare the enum in the same 6854 // scope as we would have picked for any other tag type. 6855 // 6856 // GNU C also supports this behavior as part of its incomplete 6857 // enum types extension, while GNU C++ does not. 6858 // 6859 // Find the context where we'll be declaring the tag. 6860 // FIXME: We would like to maintain the current DeclContext as the 6861 // lexical context, 6862 while (SearchDC->isRecord() || SearchDC->isTransparentContext()) 6863 SearchDC = SearchDC->getParent(); 6864 6865 // Find the scope where we'll be declaring the tag. 6866 while (S->isClassScope() || 6867 (getLangOptions().CPlusPlus && 6868 S->isFunctionPrototypeScope()) || 6869 ((S->getFlags() & Scope::DeclScope) == 0) || 6870 (S->getEntity() && 6871 ((DeclContext *)S->getEntity())->isTransparentContext())) 6872 S = S->getParent(); 6873 } else { 6874 assert(TUK == TUK_Friend); 6875 // C++ [namespace.memdef]p3: 6876 // If a friend declaration in a non-local class first declares a 6877 // class or function, the friend class or function is a member of 6878 // the innermost enclosing namespace. 6879 SearchDC = SearchDC->getEnclosingNamespaceContext(); 6880 } 6881 6882 // In C++, we need to do a redeclaration lookup to properly 6883 // diagnose some problems. 6884 if (getLangOptions().CPlusPlus) { 6885 Previous.setRedeclarationKind(ForRedeclaration); 6886 LookupQualifiedName(Previous, SearchDC); 6887 } 6888 } 6889 6890 if (!Previous.empty()) { 6891 NamedDecl *PrevDecl = (*Previous.begin())->getUnderlyingDecl(); 6892 6893 // It's okay to have a tag decl in the same scope as a typedef 6894 // which hides a tag decl in the same scope. Finding this 6895 // insanity with a redeclaration lookup can only actually happen 6896 // in C++. 6897 // 6898 // This is also okay for elaborated-type-specifiers, which is 6899 // technically forbidden by the current standard but which is 6900 // okay according to the likely resolution of an open issue; 6901 // see http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#407 6902 if (getLangOptions().CPlusPlus) { 6903 if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(PrevDecl)) { 6904 if (const TagType *TT = TD->getUnderlyingType()->getAs<TagType>()) { 6905 TagDecl *Tag = TT->getDecl(); 6906 if (Tag->getDeclName() == Name && 6907 Tag->getDeclContext()->getRedeclContext() 6908 ->Equals(TD->getDeclContext()->getRedeclContext())) { 6909 PrevDecl = Tag; 6910 Previous.clear(); 6911 Previous.addDecl(Tag); 6912 Previous.resolveKind(); 6913 } 6914 } 6915 } 6916 } 6917 6918 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 6919 // If this is a use of a previous tag, or if the tag is already declared 6920 // in the same scope (so that the definition/declaration completes or 6921 // rementions the tag), reuse the decl. 6922 if (TUK == TUK_Reference || TUK == TUK_Friend || 6923 isDeclInScope(PrevDecl, SearchDC, S, isExplicitSpecialization)) { 6924 // Make sure that this wasn't declared as an enum and now used as a 6925 // struct or something similar. 6926 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, KWLoc, *Name)) { 6927 bool SafeToContinue 6928 = (PrevTagDecl->getTagKind() != TTK_Enum && 6929 Kind != TTK_Enum); 6930 if (SafeToContinue) 6931 Diag(KWLoc, diag::err_use_with_wrong_tag) 6932 << Name 6933 << FixItHint::CreateReplacement(SourceRange(KWLoc), 6934 PrevTagDecl->getKindName()); 6935 else 6936 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 6937 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 6938 6939 if (SafeToContinue) 6940 Kind = PrevTagDecl->getTagKind(); 6941 else { 6942 // Recover by making this an anonymous redefinition. 6943 Name = 0; 6944 Previous.clear(); 6945 Invalid = true; 6946 } 6947 } 6948 6949 if (Kind == TTK_Enum && PrevTagDecl->getTagKind() == TTK_Enum) { 6950 const EnumDecl *PrevEnum = cast<EnumDecl>(PrevTagDecl); 6951 6952 // All conflicts with previous declarations are recovered by 6953 // returning the previous declaration. 6954 if (ScopedEnum != PrevEnum->isScoped()) { 6955 Diag(KWLoc, diag::err_enum_redeclare_scoped_mismatch) 6956 << PrevEnum->isScoped(); 6957 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 6958 return PrevTagDecl; 6959 } 6960 else if (EnumUnderlying && PrevEnum->isFixed()) { 6961 QualType T; 6962 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 6963 T = TI->getType(); 6964 else 6965 T = QualType(EnumUnderlying.get<const Type*>(), 0); 6966 6967 if (!Context.hasSameUnqualifiedType(T, PrevEnum->getIntegerType())) { 6968 Diag(NameLoc.isValid() ? NameLoc : KWLoc, 6969 diag::err_enum_redeclare_type_mismatch) 6970 << T 6971 << PrevEnum->getIntegerType(); 6972 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 6973 return PrevTagDecl; 6974 } 6975 } 6976 else if (!EnumUnderlying.isNull() != PrevEnum->isFixed()) { 6977 Diag(KWLoc, diag::err_enum_redeclare_fixed_mismatch) 6978 << PrevEnum->isFixed(); 6979 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 6980 return PrevTagDecl; 6981 } 6982 } 6983 6984 if (!Invalid) { 6985 // If this is a use, just return the declaration we found. 6986 6987 // FIXME: In the future, return a variant or some other clue 6988 // for the consumer of this Decl to know it doesn't own it. 6989 // For our current ASTs this shouldn't be a problem, but will 6990 // need to be changed with DeclGroups. 6991 if ((TUK == TUK_Reference && !PrevTagDecl->getFriendObjectKind()) || 6992 TUK == TUK_Friend) 6993 return PrevTagDecl; 6994 6995 // Diagnose attempts to redefine a tag. 6996 if (TUK == TUK_Definition) { 6997 if (TagDecl *Def = PrevTagDecl->getDefinition()) { 6998 // If we're defining a specialization and the previous definition 6999 // is from an implicit instantiation, don't emit an error 7000 // here; we'll catch this in the general case below. 7001 if (!isExplicitSpecialization || 7002 !isa<CXXRecordDecl>(Def) || 7003 cast<CXXRecordDecl>(Def)->getTemplateSpecializationKind() 7004 == TSK_ExplicitSpecialization) { 7005 Diag(NameLoc, diag::err_redefinition) << Name; 7006 Diag(Def->getLocation(), diag::note_previous_definition); 7007 // If this is a redefinition, recover by making this 7008 // struct be anonymous, which will make any later 7009 // references get the previous definition. 7010 Name = 0; 7011 Previous.clear(); 7012 Invalid = true; 7013 } 7014 } else { 7015 // If the type is currently being defined, complain 7016 // about a nested redefinition. 7017 const TagType *Tag 7018 = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 7019 if (Tag->isBeingDefined()) { 7020 Diag(NameLoc, diag::err_nested_redefinition) << Name; 7021 Diag(PrevTagDecl->getLocation(), 7022 diag::note_previous_definition); 7023 Name = 0; 7024 Previous.clear(); 7025 Invalid = true; 7026 } 7027 } 7028 7029 // Okay, this is definition of a previously declared or referenced 7030 // tag PrevDecl. We're going to create a new Decl for it. 7031 } 7032 } 7033 // If we get here we have (another) forward declaration or we 7034 // have a definition. Just create a new decl. 7035 7036 } else { 7037 // If we get here, this is a definition of a new tag type in a nested 7038 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 7039 // new decl/type. We set PrevDecl to NULL so that the entities 7040 // have distinct types. 7041 Previous.clear(); 7042 } 7043 // If we get here, we're going to create a new Decl. If PrevDecl 7044 // is non-NULL, it's a definition of the tag declared by 7045 // PrevDecl. If it's NULL, we have a new definition. 7046 7047 7048 // Otherwise, PrevDecl is not a tag, but was found with tag 7049 // lookup. This is only actually possible in C++, where a few 7050 // things like templates still live in the tag namespace. 7051 } else { 7052 assert(getLangOptions().CPlusPlus); 7053 7054 // Use a better diagnostic if an elaborated-type-specifier 7055 // found the wrong kind of type on the first 7056 // (non-redeclaration) lookup. 7057 if ((TUK == TUK_Reference || TUK == TUK_Friend) && 7058 !Previous.isForRedeclaration()) { 7059 unsigned Kind = 0; 7060 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 7061 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 7062 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 7063 Diag(NameLoc, diag::err_tag_reference_non_tag) << Kind; 7064 Diag(PrevDecl->getLocation(), diag::note_declared_at); 7065 Invalid = true; 7066 7067 // Otherwise, only diagnose if the declaration is in scope. 7068 } else if (!isDeclInScope(PrevDecl, SearchDC, S, 7069 isExplicitSpecialization)) { 7070 // do nothing 7071 7072 // Diagnose implicit declarations introduced by elaborated types. 7073 } else if (TUK == TUK_Reference || TUK == TUK_Friend) { 7074 unsigned Kind = 0; 7075 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 7076 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 7077 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 7078 Diag(NameLoc, diag::err_tag_reference_conflict) << Kind; 7079 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 7080 Invalid = true; 7081 7082 // Otherwise it's a declaration. Call out a particularly common 7083 // case here. 7084 } else if (TypedefNameDecl *TND = dyn_cast<TypedefNameDecl>(PrevDecl)) { 7085 unsigned Kind = 0; 7086 if (isa<TypeAliasDecl>(PrevDecl)) Kind = 1; 7087 Diag(NameLoc, diag::err_tag_definition_of_typedef) 7088 << Name << Kind << TND->getUnderlyingType(); 7089 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 7090 Invalid = true; 7091 7092 // Otherwise, diagnose. 7093 } else { 7094 // The tag name clashes with something else in the target scope, 7095 // issue an error and recover by making this tag be anonymous. 7096 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 7097 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 7098 Name = 0; 7099 Invalid = true; 7100 } 7101 7102 // The existing declaration isn't relevant to us; we're in a 7103 // new scope, so clear out the previous declaration. 7104 Previous.clear(); 7105 } 7106 } 7107 7108CreateNewDecl: 7109 7110 TagDecl *PrevDecl = 0; 7111 if (Previous.isSingleResult()) 7112 PrevDecl = cast<TagDecl>(Previous.getFoundDecl()); 7113 7114 // If there is an identifier, use the location of the identifier as the 7115 // location of the decl, otherwise use the location of the struct/union 7116 // keyword. 7117 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 7118 7119 // Otherwise, create a new declaration. If there is a previous 7120 // declaration of the same entity, the two will be linked via 7121 // PrevDecl. 7122 TagDecl *New; 7123 7124 bool IsForwardReference = false; 7125 if (Kind == TTK_Enum) { 7126 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 7127 // enum X { A, B, C } D; D should chain to X. 7128 New = EnumDecl::Create(Context, SearchDC, KWLoc, Loc, Name, 7129 cast_or_null<EnumDecl>(PrevDecl), ScopedEnum, 7130 ScopedEnumUsesClassTag, !EnumUnderlying.isNull()); 7131 // If this is an undefined enum, warn. 7132 if (TUK != TUK_Definition && !Invalid) { 7133 TagDecl *Def; 7134 if (getLangOptions().CPlusPlus0x && cast<EnumDecl>(New)->isFixed()) { 7135 // C++0x: 7.2p2: opaque-enum-declaration. 7136 // Conflicts are diagnosed above. Do nothing. 7137 } 7138 else if (PrevDecl && (Def = cast<EnumDecl>(PrevDecl)->getDefinition())) { 7139 Diag(Loc, diag::ext_forward_ref_enum_def) 7140 << New; 7141 Diag(Def->getLocation(), diag::note_previous_definition); 7142 } else { 7143 unsigned DiagID = diag::ext_forward_ref_enum; 7144 if (getLangOptions().Microsoft) 7145 DiagID = diag::ext_ms_forward_ref_enum; 7146 else if (getLangOptions().CPlusPlus) 7147 DiagID = diag::err_forward_ref_enum; 7148 Diag(Loc, DiagID); 7149 7150 // If this is a forward-declared reference to an enumeration, make a 7151 // note of it; we won't actually be introducing the declaration into 7152 // the declaration context. 7153 if (TUK == TUK_Reference) 7154 IsForwardReference = true; 7155 } 7156 } 7157 7158 if (EnumUnderlying) { 7159 EnumDecl *ED = cast<EnumDecl>(New); 7160 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 7161 ED->setIntegerTypeSourceInfo(TI); 7162 else 7163 ED->setIntegerType(QualType(EnumUnderlying.get<const Type*>(), 0)); 7164 ED->setPromotionType(ED->getIntegerType()); 7165 } 7166 7167 } else { 7168 // struct/union/class 7169 7170 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 7171 // struct X { int A; } D; D should chain to X. 7172 if (getLangOptions().CPlusPlus) { 7173 // FIXME: Look for a way to use RecordDecl for simple structs. 7174 New = CXXRecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 7175 cast_or_null<CXXRecordDecl>(PrevDecl)); 7176 7177 if (isStdBadAlloc && (!StdBadAlloc || getStdBadAlloc()->isImplicit())) 7178 StdBadAlloc = cast<CXXRecordDecl>(New); 7179 } else 7180 New = RecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 7181 cast_or_null<RecordDecl>(PrevDecl)); 7182 } 7183 7184 // Maybe add qualifier info. 7185 if (SS.isNotEmpty()) { 7186 if (SS.isSet()) { 7187 New->setQualifierInfo(SS.getWithLocInContext(Context)); 7188 if (TemplateParameterLists.size() > 0) { 7189 New->setTemplateParameterListsInfo(Context, 7190 TemplateParameterLists.size(), 7191 (TemplateParameterList**) TemplateParameterLists.release()); 7192 } 7193 } 7194 else 7195 Invalid = true; 7196 } 7197 7198 if (RecordDecl *RD = dyn_cast<RecordDecl>(New)) { 7199 // Add alignment attributes if necessary; these attributes are checked when 7200 // the ASTContext lays out the structure. 7201 // 7202 // It is important for implementing the correct semantics that this 7203 // happen here (in act on tag decl). The #pragma pack stack is 7204 // maintained as a result of parser callbacks which can occur at 7205 // many points during the parsing of a struct declaration (because 7206 // the #pragma tokens are effectively skipped over during the 7207 // parsing of the struct). 7208 AddAlignmentAttributesForRecord(RD); 7209 7210 AddMsStructLayoutForRecord(RD); 7211 } 7212 7213 // If this is a specialization of a member class (of a class template), 7214 // check the specialization. 7215 if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous)) 7216 Invalid = true; 7217 7218 if (Invalid) 7219 New->setInvalidDecl(); 7220 7221 if (Attr) 7222 ProcessDeclAttributeList(S, New, Attr); 7223 7224 // If we're declaring or defining a tag in function prototype scope 7225 // in C, note that this type can only be used within the function. 7226 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 7227 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 7228 7229 // Set the lexical context. If the tag has a C++ scope specifier, the 7230 // lexical context will be different from the semantic context. 7231 New->setLexicalDeclContext(CurContext); 7232 7233 // Mark this as a friend decl if applicable. 7234 if (TUK == TUK_Friend) 7235 New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ !Previous.empty()); 7236 7237 // Set the access specifier. 7238 if (!Invalid && SearchDC->isRecord()) 7239 SetMemberAccessSpecifier(New, PrevDecl, AS); 7240 7241 if (TUK == TUK_Definition) 7242 New->startDefinition(); 7243 7244 // If this has an identifier, add it to the scope stack. 7245 if (TUK == TUK_Friend) { 7246 // We might be replacing an existing declaration in the lookup tables; 7247 // if so, borrow its access specifier. 7248 if (PrevDecl) 7249 New->setAccess(PrevDecl->getAccess()); 7250 7251 DeclContext *DC = New->getDeclContext()->getRedeclContext(); 7252 DC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 7253 if (Name) // can be null along some error paths 7254 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 7255 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false); 7256 } else if (Name) { 7257 S = getNonFieldDeclScope(S); 7258 PushOnScopeChains(New, S, !IsForwardReference); 7259 if (IsForwardReference) 7260 SearchDC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 7261 7262 } else { 7263 CurContext->addDecl(New); 7264 } 7265 7266 // If this is the C FILE type, notify the AST context. 7267 if (IdentifierInfo *II = New->getIdentifier()) 7268 if (!New->isInvalidDecl() && 7269 New->getDeclContext()->getRedeclContext()->isTranslationUnit() && 7270 II->isStr("FILE")) 7271 Context.setFILEDecl(New); 7272 7273 OwnedDecl = true; 7274 return New; 7275} 7276 7277void Sema::ActOnTagStartDefinition(Scope *S, Decl *TagD) { 7278 AdjustDeclIfTemplate(TagD); 7279 TagDecl *Tag = cast<TagDecl>(TagD); 7280 7281 // Enter the tag context. 7282 PushDeclContext(S, Tag); 7283} 7284 7285void Sema::ActOnStartCXXMemberDeclarations(Scope *S, Decl *TagD, 7286 SourceLocation FinalLoc, 7287 SourceLocation LBraceLoc) { 7288 AdjustDeclIfTemplate(TagD); 7289 CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD); 7290 7291 FieldCollector->StartClass(); 7292 7293 if (!Record->getIdentifier()) 7294 return; 7295 7296 if (FinalLoc.isValid()) 7297 Record->addAttr(new (Context) FinalAttr(FinalLoc, Context)); 7298 7299 // C++ [class]p2: 7300 // [...] The class-name is also inserted into the scope of the 7301 // class itself; this is known as the injected-class-name. For 7302 // purposes of access checking, the injected-class-name is treated 7303 // as if it were a public member name. 7304 CXXRecordDecl *InjectedClassName 7305 = CXXRecordDecl::Create(Context, Record->getTagKind(), CurContext, 7306 Record->getLocStart(), Record->getLocation(), 7307 Record->getIdentifier(), 7308 /*PrevDecl=*/0, 7309 /*DelayTypeCreation=*/true); 7310 Context.getTypeDeclType(InjectedClassName, Record); 7311 InjectedClassName->setImplicit(); 7312 InjectedClassName->setAccess(AS_public); 7313 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 7314 InjectedClassName->setDescribedClassTemplate(Template); 7315 PushOnScopeChains(InjectedClassName, S); 7316 assert(InjectedClassName->isInjectedClassName() && 7317 "Broken injected-class-name"); 7318} 7319 7320void Sema::ActOnTagFinishDefinition(Scope *S, Decl *TagD, 7321 SourceLocation RBraceLoc) { 7322 AdjustDeclIfTemplate(TagD); 7323 TagDecl *Tag = cast<TagDecl>(TagD); 7324 Tag->setRBraceLoc(RBraceLoc); 7325 7326 if (isa<CXXRecordDecl>(Tag)) 7327 FieldCollector->FinishClass(); 7328 7329 // Exit this scope of this tag's definition. 7330 PopDeclContext(); 7331 7332 // Notify the consumer that we've defined a tag. 7333 Consumer.HandleTagDeclDefinition(Tag); 7334} 7335 7336void Sema::ActOnTagDefinitionError(Scope *S, Decl *TagD) { 7337 AdjustDeclIfTemplate(TagD); 7338 TagDecl *Tag = cast<TagDecl>(TagD); 7339 Tag->setInvalidDecl(); 7340 7341 // We're undoing ActOnTagStartDefinition here, not 7342 // ActOnStartCXXMemberDeclarations, so we don't have to mess with 7343 // the FieldCollector. 7344 7345 PopDeclContext(); 7346} 7347 7348// Note that FieldName may be null for anonymous bitfields. 7349bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName, 7350 QualType FieldTy, const Expr *BitWidth, 7351 bool *ZeroWidth) { 7352 // Default to true; that shouldn't confuse checks for emptiness 7353 if (ZeroWidth) 7354 *ZeroWidth = true; 7355 7356 // C99 6.7.2.1p4 - verify the field type. 7357 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 7358 if (!FieldTy->isDependentType() && !FieldTy->isIntegralOrEnumerationType()) { 7359 // Handle incomplete types with specific error. 7360 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 7361 return true; 7362 if (FieldName) 7363 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 7364 << FieldName << FieldTy << BitWidth->getSourceRange(); 7365 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) 7366 << FieldTy << BitWidth->getSourceRange(); 7367 } else if (DiagnoseUnexpandedParameterPack(const_cast<Expr *>(BitWidth), 7368 UPPC_BitFieldWidth)) 7369 return true; 7370 7371 // If the bit-width is type- or value-dependent, don't try to check 7372 // it now. 7373 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 7374 return false; 7375 7376 llvm::APSInt Value; 7377 if (VerifyIntegerConstantExpression(BitWidth, &Value)) 7378 return true; 7379 7380 if (Value != 0 && ZeroWidth) 7381 *ZeroWidth = false; 7382 7383 // Zero-width bitfield is ok for anonymous field. 7384 if (Value == 0 && FieldName) 7385 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 7386 7387 if (Value.isSigned() && Value.isNegative()) { 7388 if (FieldName) 7389 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 7390 << FieldName << Value.toString(10); 7391 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) 7392 << Value.toString(10); 7393 } 7394 7395 if (!FieldTy->isDependentType()) { 7396 uint64_t TypeSize = Context.getTypeSize(FieldTy); 7397 if (Value.getZExtValue() > TypeSize) { 7398 if (!getLangOptions().CPlusPlus) { 7399 if (FieldName) 7400 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 7401 << FieldName << (unsigned)Value.getZExtValue() 7402 << (unsigned)TypeSize; 7403 7404 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) 7405 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 7406 } 7407 7408 if (FieldName) 7409 Diag(FieldLoc, diag::warn_bitfield_width_exceeds_type_size) 7410 << FieldName << (unsigned)Value.getZExtValue() 7411 << (unsigned)TypeSize; 7412 else 7413 Diag(FieldLoc, diag::warn_anon_bitfield_width_exceeds_type_size) 7414 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 7415 } 7416 } 7417 7418 return false; 7419} 7420 7421/// ActOnField - Each field of a struct/union/class is passed into this in order 7422/// to create a FieldDecl object for it. 7423Decl *Sema::ActOnField(Scope *S, Decl *TagD, 7424 SourceLocation DeclStart, 7425 Declarator &D, ExprTy *BitfieldWidth) { 7426 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD), 7427 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 7428 AS_public); 7429 return Res; 7430} 7431 7432/// HandleField - Analyze a field of a C struct or a C++ data member. 7433/// 7434FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 7435 SourceLocation DeclStart, 7436 Declarator &D, Expr *BitWidth, 7437 AccessSpecifier AS) { 7438 IdentifierInfo *II = D.getIdentifier(); 7439 SourceLocation Loc = DeclStart; 7440 if (II) Loc = D.getIdentifierLoc(); 7441 7442 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 7443 QualType T = TInfo->getType(); 7444 if (getLangOptions().CPlusPlus) { 7445 CheckExtraCXXDefaultArguments(D); 7446 7447 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 7448 UPPC_DataMemberType)) { 7449 D.setInvalidType(); 7450 T = Context.IntTy; 7451 TInfo = Context.getTrivialTypeSourceInfo(T, Loc); 7452 } 7453 } 7454 7455 DiagnoseFunctionSpecifiers(D); 7456 7457 if (D.getDeclSpec().isThreadSpecified()) 7458 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 7459 7460 // Check to see if this name was declared as a member previously 7461 LookupResult Previous(*this, II, Loc, LookupMemberName, ForRedeclaration); 7462 LookupName(Previous, S); 7463 assert((Previous.empty() || Previous.isOverloadedResult() || 7464 Previous.isSingleResult()) 7465 && "Lookup of member name should be either overloaded, single or null"); 7466 7467 // If the name is overloaded then get any declaration else get the single result 7468 NamedDecl *PrevDecl = Previous.isOverloadedResult() ? 7469 Previous.getRepresentativeDecl() : Previous.getAsSingle<NamedDecl>(); 7470 7471 if (PrevDecl && PrevDecl->isTemplateParameter()) { 7472 // Maybe we will complain about the shadowed template parameter. 7473 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 7474 // Just pretend that we didn't see the previous declaration. 7475 PrevDecl = 0; 7476 } 7477 7478 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 7479 PrevDecl = 0; 7480 7481 bool Mutable 7482 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable); 7483 SourceLocation TSSL = D.getSourceRange().getBegin(); 7484 FieldDecl *NewFD 7485 = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, TSSL, 7486 AS, PrevDecl, &D); 7487 7488 if (NewFD->isInvalidDecl()) 7489 Record->setInvalidDecl(); 7490 7491 if (NewFD->isInvalidDecl() && PrevDecl) { 7492 // Don't introduce NewFD into scope; there's already something 7493 // with the same name in the same scope. 7494 } else if (II) { 7495 PushOnScopeChains(NewFD, S); 7496 } else 7497 Record->addDecl(NewFD); 7498 7499 return NewFD; 7500} 7501 7502/// \brief Build a new FieldDecl and check its well-formedness. 7503/// 7504/// This routine builds a new FieldDecl given the fields name, type, 7505/// record, etc. \p PrevDecl should refer to any previous declaration 7506/// with the same name and in the same scope as the field to be 7507/// created. 7508/// 7509/// \returns a new FieldDecl. 7510/// 7511/// \todo The Declarator argument is a hack. It will be removed once 7512FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 7513 TypeSourceInfo *TInfo, 7514 RecordDecl *Record, SourceLocation Loc, 7515 bool Mutable, Expr *BitWidth, 7516 SourceLocation TSSL, 7517 AccessSpecifier AS, NamedDecl *PrevDecl, 7518 Declarator *D) { 7519 IdentifierInfo *II = Name.getAsIdentifierInfo(); 7520 bool InvalidDecl = false; 7521 if (D) InvalidDecl = D->isInvalidType(); 7522 7523 // If we receive a broken type, recover by assuming 'int' and 7524 // marking this declaration as invalid. 7525 if (T.isNull()) { 7526 InvalidDecl = true; 7527 T = Context.IntTy; 7528 } 7529 7530 QualType EltTy = Context.getBaseElementType(T); 7531 if (!EltTy->isDependentType() && 7532 RequireCompleteType(Loc, EltTy, diag::err_field_incomplete)) { 7533 // Fields of incomplete type force their record to be invalid. 7534 Record->setInvalidDecl(); 7535 InvalidDecl = true; 7536 } 7537 7538 // C99 6.7.2.1p8: A member of a structure or union may have any type other 7539 // than a variably modified type. 7540 if (!InvalidDecl && T->isVariablyModifiedType()) { 7541 bool SizeIsNegative; 7542 llvm::APSInt Oversized; 7543 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 7544 SizeIsNegative, 7545 Oversized); 7546 if (!FixedTy.isNull()) { 7547 Diag(Loc, diag::warn_illegal_constant_array_size); 7548 T = FixedTy; 7549 } else { 7550 if (SizeIsNegative) 7551 Diag(Loc, diag::err_typecheck_negative_array_size); 7552 else if (Oversized.getBoolValue()) 7553 Diag(Loc, diag::err_array_too_large) 7554 << Oversized.toString(10); 7555 else 7556 Diag(Loc, diag::err_typecheck_field_variable_size); 7557 InvalidDecl = true; 7558 } 7559 } 7560 7561 // Fields can not have abstract class types 7562 if (!InvalidDecl && RequireNonAbstractType(Loc, T, 7563 diag::err_abstract_type_in_decl, 7564 AbstractFieldType)) 7565 InvalidDecl = true; 7566 7567 bool ZeroWidth = false; 7568 // If this is declared as a bit-field, check the bit-field. 7569 if (!InvalidDecl && BitWidth && 7570 VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth)) { 7571 InvalidDecl = true; 7572 BitWidth = 0; 7573 ZeroWidth = false; 7574 } 7575 7576 // Check that 'mutable' is consistent with the type of the declaration. 7577 if (!InvalidDecl && Mutable) { 7578 unsigned DiagID = 0; 7579 if (T->isReferenceType()) 7580 DiagID = diag::err_mutable_reference; 7581 else if (T.isConstQualified()) 7582 DiagID = diag::err_mutable_const; 7583 7584 if (DiagID) { 7585 SourceLocation ErrLoc = Loc; 7586 if (D && D->getDeclSpec().getStorageClassSpecLoc().isValid()) 7587 ErrLoc = D->getDeclSpec().getStorageClassSpecLoc(); 7588 Diag(ErrLoc, DiagID); 7589 Mutable = false; 7590 InvalidDecl = true; 7591 } 7592 } 7593 7594 FieldDecl *NewFD = FieldDecl::Create(Context, Record, TSSL, Loc, II, T, TInfo, 7595 BitWidth, Mutable); 7596 if (InvalidDecl) 7597 NewFD->setInvalidDecl(); 7598 7599 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 7600 Diag(Loc, diag::err_duplicate_member) << II; 7601 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 7602 NewFD->setInvalidDecl(); 7603 } 7604 7605 if (!InvalidDecl && getLangOptions().CPlusPlus) { 7606 if (Record->isUnion()) { 7607 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 7608 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 7609 if (RDecl->getDefinition()) { 7610 // C++ [class.union]p1: An object of a class with a non-trivial 7611 // constructor, a non-trivial copy constructor, a non-trivial 7612 // destructor, or a non-trivial copy assignment operator 7613 // cannot be a member of a union, nor can an array of such 7614 // objects. 7615 // TODO: C++0x alters this restriction significantly. 7616 if (CheckNontrivialField(NewFD)) 7617 NewFD->setInvalidDecl(); 7618 } 7619 } 7620 7621 // C++ [class.union]p1: If a union contains a member of reference type, 7622 // the program is ill-formed. 7623 if (EltTy->isReferenceType()) { 7624 Diag(NewFD->getLocation(), diag::err_union_member_of_reference_type) 7625 << NewFD->getDeclName() << EltTy; 7626 NewFD->setInvalidDecl(); 7627 } 7628 } 7629 } 7630 7631 // FIXME: We need to pass in the attributes given an AST 7632 // representation, not a parser representation. 7633 if (D) 7634 // FIXME: What to pass instead of TUScope? 7635 ProcessDeclAttributes(TUScope, NewFD, *D); 7636 7637 if (T.isObjCGCWeak()) 7638 Diag(Loc, diag::warn_attribute_weak_on_field); 7639 7640 NewFD->setAccess(AS); 7641 return NewFD; 7642} 7643 7644bool Sema::CheckNontrivialField(FieldDecl *FD) { 7645 assert(FD); 7646 assert(getLangOptions().CPlusPlus && "valid check only for C++"); 7647 7648 if (FD->isInvalidDecl()) 7649 return true; 7650 7651 QualType EltTy = Context.getBaseElementType(FD->getType()); 7652 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 7653 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 7654 if (RDecl->getDefinition()) { 7655 // We check for copy constructors before constructors 7656 // because otherwise we'll never get complaints about 7657 // copy constructors. 7658 7659 CXXSpecialMember member = CXXInvalid; 7660 if (!RDecl->hasTrivialCopyConstructor()) 7661 member = CXXCopyConstructor; 7662 else if (!RDecl->hasTrivialDefaultConstructor()) 7663 member = CXXDefaultConstructor; 7664 else if (!RDecl->hasTrivialCopyAssignment()) 7665 member = CXXCopyAssignment; 7666 else if (!RDecl->hasTrivialDestructor()) 7667 member = CXXDestructor; 7668 7669 if (member != CXXInvalid) { 7670 Diag(FD->getLocation(), diag::err_illegal_union_or_anon_struct_member) 7671 << (int)FD->getParent()->isUnion() << FD->getDeclName() << member; 7672 DiagnoseNontrivial(RT, member); 7673 return true; 7674 } 7675 } 7676 } 7677 7678 return false; 7679} 7680 7681/// DiagnoseNontrivial - Given that a class has a non-trivial 7682/// special member, figure out why. 7683void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) { 7684 QualType QT(T, 0U); 7685 CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl()); 7686 7687 // Check whether the member was user-declared. 7688 switch (member) { 7689 case CXXInvalid: 7690 break; 7691 7692 case CXXDefaultConstructor: 7693 if (RD->hasUserDeclaredConstructor()) { 7694 typedef CXXRecordDecl::ctor_iterator ctor_iter; 7695 for (ctor_iter ci = RD->ctor_begin(), ce = RD->ctor_end(); ci != ce;++ci){ 7696 const FunctionDecl *body = 0; 7697 ci->hasBody(body); 7698 if (!body || !cast<CXXConstructorDecl>(body)->isImplicitlyDefined()) { 7699 SourceLocation CtorLoc = ci->getLocation(); 7700 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 7701 return; 7702 } 7703 } 7704 7705 assert(0 && "found no user-declared constructors"); 7706 return; 7707 } 7708 break; 7709 7710 case CXXCopyConstructor: 7711 if (RD->hasUserDeclaredCopyConstructor()) { 7712 SourceLocation CtorLoc = 7713 RD->getCopyConstructor(Context, 0)->getLocation(); 7714 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 7715 return; 7716 } 7717 break; 7718 7719 case CXXCopyAssignment: 7720 if (RD->hasUserDeclaredCopyAssignment()) { 7721 // FIXME: this should use the location of the copy 7722 // assignment, not the type. 7723 SourceLocation TyLoc = RD->getSourceRange().getBegin(); 7724 Diag(TyLoc, diag::note_nontrivial_user_defined) << QT << member; 7725 return; 7726 } 7727 break; 7728 7729 case CXXDestructor: 7730 if (RD->hasUserDeclaredDestructor()) { 7731 SourceLocation DtorLoc = LookupDestructor(RD)->getLocation(); 7732 Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member; 7733 return; 7734 } 7735 break; 7736 } 7737 7738 typedef CXXRecordDecl::base_class_iterator base_iter; 7739 7740 // Virtual bases and members inhibit trivial copying/construction, 7741 // but not trivial destruction. 7742 if (member != CXXDestructor) { 7743 // Check for virtual bases. vbases includes indirect virtual bases, 7744 // so we just iterate through the direct bases. 7745 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) 7746 if (bi->isVirtual()) { 7747 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 7748 Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1; 7749 return; 7750 } 7751 7752 // Check for virtual methods. 7753 typedef CXXRecordDecl::method_iterator meth_iter; 7754 for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me; 7755 ++mi) { 7756 if (mi->isVirtual()) { 7757 SourceLocation MLoc = mi->getSourceRange().getBegin(); 7758 Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0; 7759 return; 7760 } 7761 } 7762 } 7763 7764 bool (CXXRecordDecl::*hasTrivial)() const; 7765 switch (member) { 7766 case CXXDefaultConstructor: 7767 hasTrivial = &CXXRecordDecl::hasTrivialDefaultConstructor; break; 7768 case CXXCopyConstructor: 7769 hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break; 7770 case CXXCopyAssignment: 7771 hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break; 7772 case CXXDestructor: 7773 hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break; 7774 default: 7775 assert(0 && "unexpected special member"); return; 7776 } 7777 7778 // Check for nontrivial bases (and recurse). 7779 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) { 7780 const RecordType *BaseRT = bi->getType()->getAs<RecordType>(); 7781 assert(BaseRT && "Don't know how to handle dependent bases"); 7782 CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl()); 7783 if (!(BaseRecTy->*hasTrivial)()) { 7784 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 7785 Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member; 7786 DiagnoseNontrivial(BaseRT, member); 7787 return; 7788 } 7789 } 7790 7791 // Check for nontrivial members (and recurse). 7792 typedef RecordDecl::field_iterator field_iter; 7793 for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe; 7794 ++fi) { 7795 QualType EltTy = Context.getBaseElementType((*fi)->getType()); 7796 if (const RecordType *EltRT = EltTy->getAs<RecordType>()) { 7797 CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl()); 7798 7799 if (!(EltRD->*hasTrivial)()) { 7800 SourceLocation FLoc = (*fi)->getLocation(); 7801 Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member; 7802 DiagnoseNontrivial(EltRT, member); 7803 return; 7804 } 7805 } 7806 } 7807 7808 assert(0 && "found no explanation for non-trivial member"); 7809} 7810 7811/// TranslateIvarVisibility - Translate visibility from a token ID to an 7812/// AST enum value. 7813static ObjCIvarDecl::AccessControl 7814TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 7815 switch (ivarVisibility) { 7816 default: assert(0 && "Unknown visitibility kind"); 7817 case tok::objc_private: return ObjCIvarDecl::Private; 7818 case tok::objc_public: return ObjCIvarDecl::Public; 7819 case tok::objc_protected: return ObjCIvarDecl::Protected; 7820 case tok::objc_package: return ObjCIvarDecl::Package; 7821 } 7822} 7823 7824/// ActOnIvar - Each ivar field of an objective-c class is passed into this 7825/// in order to create an IvarDecl object for it. 7826Decl *Sema::ActOnIvar(Scope *S, 7827 SourceLocation DeclStart, 7828 Decl *IntfDecl, 7829 Declarator &D, ExprTy *BitfieldWidth, 7830 tok::ObjCKeywordKind Visibility) { 7831 7832 IdentifierInfo *II = D.getIdentifier(); 7833 Expr *BitWidth = (Expr*)BitfieldWidth; 7834 SourceLocation Loc = DeclStart; 7835 if (II) Loc = D.getIdentifierLoc(); 7836 7837 // FIXME: Unnamed fields can be handled in various different ways, for 7838 // example, unnamed unions inject all members into the struct namespace! 7839 7840 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 7841 QualType T = TInfo->getType(); 7842 7843 if (BitWidth) { 7844 // 6.7.2.1p3, 6.7.2.1p4 7845 if (VerifyBitField(Loc, II, T, BitWidth)) { 7846 D.setInvalidType(); 7847 BitWidth = 0; 7848 } 7849 } else { 7850 // Not a bitfield. 7851 7852 // validate II. 7853 7854 } 7855 if (T->isReferenceType()) { 7856 Diag(Loc, diag::err_ivar_reference_type); 7857 D.setInvalidType(); 7858 } 7859 // C99 6.7.2.1p8: A member of a structure or union may have any type other 7860 // than a variably modified type. 7861 else if (T->isVariablyModifiedType()) { 7862 Diag(Loc, diag::err_typecheck_ivar_variable_size); 7863 D.setInvalidType(); 7864 } 7865 7866 // Get the visibility (access control) for this ivar. 7867 ObjCIvarDecl::AccessControl ac = 7868 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 7869 : ObjCIvarDecl::None; 7870 // Must set ivar's DeclContext to its enclosing interface. 7871 ObjCContainerDecl *EnclosingDecl = cast<ObjCContainerDecl>(IntfDecl); 7872 ObjCContainerDecl *EnclosingContext; 7873 if (ObjCImplementationDecl *IMPDecl = 7874 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 7875 if (!LangOpts.ObjCNonFragileABI2) { 7876 // Case of ivar declared in an implementation. Context is that of its class. 7877 EnclosingContext = IMPDecl->getClassInterface(); 7878 assert(EnclosingContext && "Implementation has no class interface!"); 7879 } 7880 else 7881 EnclosingContext = EnclosingDecl; 7882 } else { 7883 if (ObjCCategoryDecl *CDecl = 7884 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 7885 if (!LangOpts.ObjCNonFragileABI2 || !CDecl->IsClassExtension()) { 7886 Diag(Loc, diag::err_misplaced_ivar) << CDecl->IsClassExtension(); 7887 return 0; 7888 } 7889 } 7890 EnclosingContext = EnclosingDecl; 7891 } 7892 7893 // Construct the decl. 7894 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, EnclosingContext, 7895 DeclStart, Loc, II, T, 7896 TInfo, ac, (Expr *)BitfieldWidth); 7897 7898 if (II) { 7899 NamedDecl *PrevDecl = LookupSingleName(S, II, Loc, LookupMemberName, 7900 ForRedeclaration); 7901 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S) 7902 && !isa<TagDecl>(PrevDecl)) { 7903 Diag(Loc, diag::err_duplicate_member) << II; 7904 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 7905 NewID->setInvalidDecl(); 7906 } 7907 } 7908 7909 // Process attributes attached to the ivar. 7910 ProcessDeclAttributes(S, NewID, D); 7911 7912 if (D.isInvalidType()) 7913 NewID->setInvalidDecl(); 7914 7915 if (II) { 7916 // FIXME: When interfaces are DeclContexts, we'll need to add 7917 // these to the interface. 7918 S->AddDecl(NewID); 7919 IdResolver.AddDecl(NewID); 7920 } 7921 7922 return NewID; 7923} 7924 7925/// ActOnLastBitfield - This routine handles synthesized bitfields rules for 7926/// class and class extensions. For every class @interface and class 7927/// extension @interface, if the last ivar is a bitfield of any type, 7928/// then add an implicit `char :0` ivar to the end of that interface. 7929void Sema::ActOnLastBitfield(SourceLocation DeclLoc, Decl *EnclosingDecl, 7930 llvm::SmallVectorImpl<Decl *> &AllIvarDecls) { 7931 if (!LangOpts.ObjCNonFragileABI2 || AllIvarDecls.empty()) 7932 return; 7933 7934 Decl *ivarDecl = AllIvarDecls[AllIvarDecls.size()-1]; 7935 ObjCIvarDecl *Ivar = cast<ObjCIvarDecl>(ivarDecl); 7936 7937 if (!Ivar->isBitField()) 7938 return; 7939 uint64_t BitFieldSize = 7940 Ivar->getBitWidth()->EvaluateAsInt(Context).getZExtValue(); 7941 if (BitFieldSize == 0) 7942 return; 7943 ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl); 7944 if (!ID) { 7945 if (ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 7946 if (!CD->IsClassExtension()) 7947 return; 7948 } 7949 // No need to add this to end of @implementation. 7950 else 7951 return; 7952 } 7953 // All conditions are met. Add a new bitfield to the tail end of ivars. 7954 llvm::APInt Zero(Context.getTypeSize(Context.CharTy), 0); 7955 Expr * BW = IntegerLiteral::Create(Context, Zero, Context.CharTy, DeclLoc); 7956 7957 Ivar = ObjCIvarDecl::Create(Context, cast<ObjCContainerDecl>(EnclosingDecl), 7958 DeclLoc, DeclLoc, 0, 7959 Context.CharTy, 7960 Context.CreateTypeSourceInfo(Context.CharTy), 7961 ObjCIvarDecl::Private, BW, 7962 true); 7963 AllIvarDecls.push_back(Ivar); 7964} 7965 7966void Sema::ActOnFields(Scope* S, 7967 SourceLocation RecLoc, Decl *EnclosingDecl, 7968 Decl **Fields, unsigned NumFields, 7969 SourceLocation LBrac, SourceLocation RBrac, 7970 AttributeList *Attr) { 7971 assert(EnclosingDecl && "missing record or interface decl"); 7972 7973 // If the decl this is being inserted into is invalid, then it may be a 7974 // redeclaration or some other bogus case. Don't try to add fields to it. 7975 if (EnclosingDecl->isInvalidDecl()) { 7976 // FIXME: Deallocate fields? 7977 return; 7978 } 7979 7980 7981 // Verify that all the fields are okay. 7982 unsigned NumNamedMembers = 0; 7983 llvm::SmallVector<FieldDecl*, 32> RecFields; 7984 7985 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 7986 for (unsigned i = 0; i != NumFields; ++i) { 7987 FieldDecl *FD = cast<FieldDecl>(Fields[i]); 7988 7989 // Get the type for the field. 7990 const Type *FDTy = FD->getType().getTypePtr(); 7991 7992 if (!FD->isAnonymousStructOrUnion()) { 7993 // Remember all fields written by the user. 7994 RecFields.push_back(FD); 7995 } 7996 7997 // If the field is already invalid for some reason, don't emit more 7998 // diagnostics about it. 7999 if (FD->isInvalidDecl()) { 8000 EnclosingDecl->setInvalidDecl(); 8001 continue; 8002 } 8003 8004 // C99 6.7.2.1p2: 8005 // A structure or union shall not contain a member with 8006 // incomplete or function type (hence, a structure shall not 8007 // contain an instance of itself, but may contain a pointer to 8008 // an instance of itself), except that the last member of a 8009 // structure with more than one named member may have incomplete 8010 // array type; such a structure (and any union containing, 8011 // possibly recursively, a member that is such a structure) 8012 // shall not be a member of a structure or an element of an 8013 // array. 8014 if (FDTy->isFunctionType()) { 8015 // Field declared as a function. 8016 Diag(FD->getLocation(), diag::err_field_declared_as_function) 8017 << FD->getDeclName(); 8018 FD->setInvalidDecl(); 8019 EnclosingDecl->setInvalidDecl(); 8020 continue; 8021 } else if (FDTy->isIncompleteArrayType() && Record && 8022 ((i == NumFields - 1 && !Record->isUnion()) || 8023 ((getLangOptions().Microsoft || getLangOptions().CPlusPlus) && 8024 (i == NumFields - 1 || Record->isUnion())))) { 8025 // Flexible array member. 8026 // Microsoft and g++ is more permissive regarding flexible array. 8027 // It will accept flexible array in union and also 8028 // as the sole element of a struct/class. 8029 if (getLangOptions().Microsoft) { 8030 if (Record->isUnion()) 8031 Diag(FD->getLocation(), diag::ext_flexible_array_union_ms) 8032 << FD->getDeclName(); 8033 else if (NumFields == 1) 8034 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_ms) 8035 << FD->getDeclName() << Record->getTagKind(); 8036 } else if (getLangOptions().CPlusPlus) { 8037 if (Record->isUnion()) 8038 Diag(FD->getLocation(), diag::ext_flexible_array_union_gnu) 8039 << FD->getDeclName(); 8040 else if (NumFields == 1) 8041 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_gnu) 8042 << FD->getDeclName() << Record->getTagKind(); 8043 } else if (NumNamedMembers < 1) { 8044 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 8045 << FD->getDeclName(); 8046 FD->setInvalidDecl(); 8047 EnclosingDecl->setInvalidDecl(); 8048 continue; 8049 } 8050 if (!FD->getType()->isDependentType() && 8051 !Context.getBaseElementType(FD->getType())->isPODType()) { 8052 Diag(FD->getLocation(), diag::err_flexible_array_has_nonpod_type) 8053 << FD->getDeclName() << FD->getType(); 8054 FD->setInvalidDecl(); 8055 EnclosingDecl->setInvalidDecl(); 8056 continue; 8057 } 8058 // Okay, we have a legal flexible array member at the end of the struct. 8059 if (Record) 8060 Record->setHasFlexibleArrayMember(true); 8061 } else if (!FDTy->isDependentType() && 8062 RequireCompleteType(FD->getLocation(), FD->getType(), 8063 diag::err_field_incomplete)) { 8064 // Incomplete type 8065 FD->setInvalidDecl(); 8066 EnclosingDecl->setInvalidDecl(); 8067 continue; 8068 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) { 8069 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 8070 // If this is a member of a union, then entire union becomes "flexible". 8071 if (Record && Record->isUnion()) { 8072 Record->setHasFlexibleArrayMember(true); 8073 } else { 8074 // If this is a struct/class and this is not the last element, reject 8075 // it. Note that GCC supports variable sized arrays in the middle of 8076 // structures. 8077 if (i != NumFields-1) 8078 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 8079 << FD->getDeclName() << FD->getType(); 8080 else { 8081 // We support flexible arrays at the end of structs in 8082 // other structs as an extension. 8083 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 8084 << FD->getDeclName(); 8085 if (Record) 8086 Record->setHasFlexibleArrayMember(true); 8087 } 8088 } 8089 } 8090 if (Record && FDTTy->getDecl()->hasObjectMember()) 8091 Record->setHasObjectMember(true); 8092 } else if (FDTy->isObjCObjectType()) { 8093 /// A field cannot be an Objective-c object 8094 Diag(FD->getLocation(), diag::err_statically_allocated_object); 8095 FD->setInvalidDecl(); 8096 EnclosingDecl->setInvalidDecl(); 8097 continue; 8098 } else if (getLangOptions().ObjC1 && 8099 getLangOptions().getGCMode() != LangOptions::NonGC && 8100 Record && 8101 (FD->getType()->isObjCObjectPointerType() || 8102 FD->getType().isObjCGCStrong())) 8103 Record->setHasObjectMember(true); 8104 else if (Context.getAsArrayType(FD->getType())) { 8105 QualType BaseType = Context.getBaseElementType(FD->getType()); 8106 if (Record && BaseType->isRecordType() && 8107 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()) 8108 Record->setHasObjectMember(true); 8109 } 8110 // Keep track of the number of named members. 8111 if (FD->getIdentifier()) 8112 ++NumNamedMembers; 8113 } 8114 8115 // Okay, we successfully defined 'Record'. 8116 if (Record) { 8117 bool Completed = false; 8118 if (CXXRecordDecl *CXXRecord = dyn_cast<CXXRecordDecl>(Record)) { 8119 if (!CXXRecord->isInvalidDecl()) { 8120 // Set access bits correctly on the directly-declared conversions. 8121 UnresolvedSetImpl *Convs = CXXRecord->getConversionFunctions(); 8122 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); 8123 I != E; ++I) 8124 Convs->setAccess(I, (*I)->getAccess()); 8125 8126 if (!CXXRecord->isDependentType()) { 8127 // Add any implicitly-declared members to this class. 8128 AddImplicitlyDeclaredMembersToClass(CXXRecord); 8129 8130 // If we have virtual base classes, we may end up finding multiple 8131 // final overriders for a given virtual function. Check for this 8132 // problem now. 8133 if (CXXRecord->getNumVBases()) { 8134 CXXFinalOverriderMap FinalOverriders; 8135 CXXRecord->getFinalOverriders(FinalOverriders); 8136 8137 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 8138 MEnd = FinalOverriders.end(); 8139 M != MEnd; ++M) { 8140 for (OverridingMethods::iterator SO = M->second.begin(), 8141 SOEnd = M->second.end(); 8142 SO != SOEnd; ++SO) { 8143 assert(SO->second.size() > 0 && 8144 "Virtual function without overridding functions?"); 8145 if (SO->second.size() == 1) 8146 continue; 8147 8148 // C++ [class.virtual]p2: 8149 // In a derived class, if a virtual member function of a base 8150 // class subobject has more than one final overrider the 8151 // program is ill-formed. 8152 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 8153 << (NamedDecl *)M->first << Record; 8154 Diag(M->first->getLocation(), 8155 diag::note_overridden_virtual_function); 8156 for (OverridingMethods::overriding_iterator 8157 OM = SO->second.begin(), 8158 OMEnd = SO->second.end(); 8159 OM != OMEnd; ++OM) 8160 Diag(OM->Method->getLocation(), diag::note_final_overrider) 8161 << (NamedDecl *)M->first << OM->Method->getParent(); 8162 8163 Record->setInvalidDecl(); 8164 } 8165 } 8166 CXXRecord->completeDefinition(&FinalOverriders); 8167 Completed = true; 8168 } 8169 } 8170 } 8171 } 8172 8173 if (!Completed) 8174 Record->completeDefinition(); 8175 } else { 8176 ObjCIvarDecl **ClsFields = 8177 reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); 8178 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 8179 ID->setLocEnd(RBrac); 8180 // Add ivar's to class's DeclContext. 8181 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 8182 ClsFields[i]->setLexicalDeclContext(ID); 8183 ID->addDecl(ClsFields[i]); 8184 } 8185 // Must enforce the rule that ivars in the base classes may not be 8186 // duplicates. 8187 if (ID->getSuperClass()) 8188 DiagnoseDuplicateIvars(ID, ID->getSuperClass()); 8189 } else if (ObjCImplementationDecl *IMPDecl = 8190 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 8191 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 8192 for (unsigned I = 0, N = RecFields.size(); I != N; ++I) 8193 // Ivar declared in @implementation never belongs to the implementation. 8194 // Only it is in implementation's lexical context. 8195 ClsFields[I]->setLexicalDeclContext(IMPDecl); 8196 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 8197 } else if (ObjCCategoryDecl *CDecl = 8198 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 8199 // case of ivars in class extension; all other cases have been 8200 // reported as errors elsewhere. 8201 // FIXME. Class extension does not have a LocEnd field. 8202 // CDecl->setLocEnd(RBrac); 8203 // Add ivar's to class extension's DeclContext. 8204 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 8205 ClsFields[i]->setLexicalDeclContext(CDecl); 8206 CDecl->addDecl(ClsFields[i]); 8207 } 8208 } 8209 } 8210 8211 if (Attr) 8212 ProcessDeclAttributeList(S, Record, Attr); 8213 8214 // If there's a #pragma GCC visibility in scope, and this isn't a subclass, 8215 // set the visibility of this record. 8216 if (Record && !Record->getDeclContext()->isRecord()) 8217 AddPushedVisibilityAttribute(Record); 8218} 8219 8220/// \brief Determine whether the given integral value is representable within 8221/// the given type T. 8222static bool isRepresentableIntegerValue(ASTContext &Context, 8223 llvm::APSInt &Value, 8224 QualType T) { 8225 assert(T->isIntegralType(Context) && "Integral type required!"); 8226 unsigned BitWidth = Context.getIntWidth(T); 8227 8228 if (Value.isUnsigned() || Value.isNonNegative()) { 8229 if (T->isSignedIntegerType()) 8230 --BitWidth; 8231 return Value.getActiveBits() <= BitWidth; 8232 } 8233 return Value.getMinSignedBits() <= BitWidth; 8234} 8235 8236// \brief Given an integral type, return the next larger integral type 8237// (or a NULL type of no such type exists). 8238static QualType getNextLargerIntegralType(ASTContext &Context, QualType T) { 8239 // FIXME: Int128/UInt128 support, which also needs to be introduced into 8240 // enum checking below. 8241 assert(T->isIntegralType(Context) && "Integral type required!"); 8242 const unsigned NumTypes = 4; 8243 QualType SignedIntegralTypes[NumTypes] = { 8244 Context.ShortTy, Context.IntTy, Context.LongTy, Context.LongLongTy 8245 }; 8246 QualType UnsignedIntegralTypes[NumTypes] = { 8247 Context.UnsignedShortTy, Context.UnsignedIntTy, Context.UnsignedLongTy, 8248 Context.UnsignedLongLongTy 8249 }; 8250 8251 unsigned BitWidth = Context.getTypeSize(T); 8252 QualType *Types = T->isSignedIntegerType()? SignedIntegralTypes 8253 : UnsignedIntegralTypes; 8254 for (unsigned I = 0; I != NumTypes; ++I) 8255 if (Context.getTypeSize(Types[I]) > BitWidth) 8256 return Types[I]; 8257 8258 return QualType(); 8259} 8260 8261EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 8262 EnumConstantDecl *LastEnumConst, 8263 SourceLocation IdLoc, 8264 IdentifierInfo *Id, 8265 Expr *Val) { 8266 unsigned IntWidth = Context.Target.getIntWidth(); 8267 llvm::APSInt EnumVal(IntWidth); 8268 QualType EltTy; 8269 8270 if (Val && DiagnoseUnexpandedParameterPack(Val, UPPC_EnumeratorValue)) 8271 Val = 0; 8272 8273 if (Val) { 8274 if (Enum->isDependentType() || Val->isTypeDependent()) 8275 EltTy = Context.DependentTy; 8276 else { 8277 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 8278 SourceLocation ExpLoc; 8279 if (!Val->isValueDependent() && 8280 VerifyIntegerConstantExpression(Val, &EnumVal)) { 8281 Val = 0; 8282 } else { 8283 if (!getLangOptions().CPlusPlus) { 8284 // C99 6.7.2.2p2: 8285 // The expression that defines the value of an enumeration constant 8286 // shall be an integer constant expression that has a value 8287 // representable as an int. 8288 8289 // Complain if the value is not representable in an int. 8290 if (!isRepresentableIntegerValue(Context, EnumVal, Context.IntTy)) 8291 Diag(IdLoc, diag::ext_enum_value_not_int) 8292 << EnumVal.toString(10) << Val->getSourceRange() 8293 << (EnumVal.isUnsigned() || EnumVal.isNonNegative()); 8294 else if (!Context.hasSameType(Val->getType(), Context.IntTy)) { 8295 // Force the type of the expression to 'int'. 8296 Val = ImpCastExprToType(Val, Context.IntTy, CK_IntegralCast).take(); 8297 } 8298 } 8299 8300 if (Enum->isFixed()) { 8301 EltTy = Enum->getIntegerType(); 8302 8303 // C++0x [dcl.enum]p5: 8304 // ... if the initializing value of an enumerator cannot be 8305 // represented by the underlying type, the program is ill-formed. 8306 if (!isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 8307 if (getLangOptions().Microsoft) { 8308 Diag(IdLoc, diag::ext_enumerator_too_large) << EltTy; 8309 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 8310 } else 8311 Diag(IdLoc, diag::err_enumerator_too_large) 8312 << EltTy; 8313 } else 8314 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 8315 } 8316 else { 8317 // C++0x [dcl.enum]p5: 8318 // If the underlying type is not fixed, the type of each enumerator 8319 // is the type of its initializing value: 8320 // - If an initializer is specified for an enumerator, the 8321 // initializing value has the same type as the expression. 8322 EltTy = Val->getType(); 8323 } 8324 } 8325 } 8326 } 8327 8328 if (!Val) { 8329 if (Enum->isDependentType()) 8330 EltTy = Context.DependentTy; 8331 else if (!LastEnumConst) { 8332 // C++0x [dcl.enum]p5: 8333 // If the underlying type is not fixed, the type of each enumerator 8334 // is the type of its initializing value: 8335 // - If no initializer is specified for the first enumerator, the 8336 // initializing value has an unspecified integral type. 8337 // 8338 // GCC uses 'int' for its unspecified integral type, as does 8339 // C99 6.7.2.2p3. 8340 if (Enum->isFixed()) { 8341 EltTy = Enum->getIntegerType(); 8342 } 8343 else { 8344 EltTy = Context.IntTy; 8345 } 8346 } else { 8347 // Assign the last value + 1. 8348 EnumVal = LastEnumConst->getInitVal(); 8349 ++EnumVal; 8350 EltTy = LastEnumConst->getType(); 8351 8352 // Check for overflow on increment. 8353 if (EnumVal < LastEnumConst->getInitVal()) { 8354 // C++0x [dcl.enum]p5: 8355 // If the underlying type is not fixed, the type of each enumerator 8356 // is the type of its initializing value: 8357 // 8358 // - Otherwise the type of the initializing value is the same as 8359 // the type of the initializing value of the preceding enumerator 8360 // unless the incremented value is not representable in that type, 8361 // in which case the type is an unspecified integral type 8362 // sufficient to contain the incremented value. If no such type 8363 // exists, the program is ill-formed. 8364 QualType T = getNextLargerIntegralType(Context, EltTy); 8365 if (T.isNull() || Enum->isFixed()) { 8366 // There is no integral type larger enough to represent this 8367 // value. Complain, then allow the value to wrap around. 8368 EnumVal = LastEnumConst->getInitVal(); 8369 EnumVal = EnumVal.zext(EnumVal.getBitWidth() * 2); 8370 ++EnumVal; 8371 if (Enum->isFixed()) 8372 // When the underlying type is fixed, this is ill-formed. 8373 Diag(IdLoc, diag::err_enumerator_wrapped) 8374 << EnumVal.toString(10) 8375 << EltTy; 8376 else 8377 Diag(IdLoc, diag::warn_enumerator_too_large) 8378 << EnumVal.toString(10); 8379 } else { 8380 EltTy = T; 8381 } 8382 8383 // Retrieve the last enumerator's value, extent that type to the 8384 // type that is supposed to be large enough to represent the incremented 8385 // value, then increment. 8386 EnumVal = LastEnumConst->getInitVal(); 8387 EnumVal.setIsSigned(EltTy->isSignedIntegerType()); 8388 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 8389 ++EnumVal; 8390 8391 // If we're not in C++, diagnose the overflow of enumerator values, 8392 // which in C99 means that the enumerator value is not representable in 8393 // an int (C99 6.7.2.2p2). However, we support GCC's extension that 8394 // permits enumerator values that are representable in some larger 8395 // integral type. 8396 if (!getLangOptions().CPlusPlus && !T.isNull()) 8397 Diag(IdLoc, diag::warn_enum_value_overflow); 8398 } else if (!getLangOptions().CPlusPlus && 8399 !isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 8400 // Enforce C99 6.7.2.2p2 even when we compute the next value. 8401 Diag(IdLoc, diag::ext_enum_value_not_int) 8402 << EnumVal.toString(10) << 1; 8403 } 8404 } 8405 } 8406 8407 if (!EltTy->isDependentType()) { 8408 // Make the enumerator value match the signedness and size of the 8409 // enumerator's type. 8410 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 8411 EnumVal.setIsSigned(EltTy->isSignedIntegerType()); 8412 } 8413 8414 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 8415 Val, EnumVal); 8416} 8417 8418 8419Decl *Sema::ActOnEnumConstant(Scope *S, Decl *theEnumDecl, Decl *lastEnumConst, 8420 SourceLocation IdLoc, IdentifierInfo *Id, 8421 AttributeList *Attr, 8422 SourceLocation EqualLoc, ExprTy *val) { 8423 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl); 8424 EnumConstantDecl *LastEnumConst = 8425 cast_or_null<EnumConstantDecl>(lastEnumConst); 8426 Expr *Val = static_cast<Expr*>(val); 8427 8428 // The scope passed in may not be a decl scope. Zip up the scope tree until 8429 // we find one that is. 8430 S = getNonFieldDeclScope(S); 8431 8432 // Verify that there isn't already something declared with this name in this 8433 // scope. 8434 NamedDecl *PrevDecl = LookupSingleName(S, Id, IdLoc, LookupOrdinaryName, 8435 ForRedeclaration); 8436 if (PrevDecl && PrevDecl->isTemplateParameter()) { 8437 // Maybe we will complain about the shadowed template parameter. 8438 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 8439 // Just pretend that we didn't see the previous declaration. 8440 PrevDecl = 0; 8441 } 8442 8443 if (PrevDecl) { 8444 // When in C++, we may get a TagDecl with the same name; in this case the 8445 // enum constant will 'hide' the tag. 8446 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 8447 "Received TagDecl when not in C++!"); 8448 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 8449 if (isa<EnumConstantDecl>(PrevDecl)) 8450 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 8451 else 8452 Diag(IdLoc, diag::err_redefinition) << Id; 8453 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 8454 return 0; 8455 } 8456 } 8457 8458 // C++ [class.mem]p13: 8459 // If T is the name of a class, then each of the following shall have a 8460 // name different from T: 8461 // - every enumerator of every member of class T that is an enumerated 8462 // type 8463 if (CXXRecordDecl *Record 8464 = dyn_cast<CXXRecordDecl>( 8465 TheEnumDecl->getDeclContext()->getRedeclContext())) 8466 if (Record->getIdentifier() && Record->getIdentifier() == Id) 8467 Diag(IdLoc, diag::err_member_name_of_class) << Id; 8468 8469 EnumConstantDecl *New = 8470 CheckEnumConstant(TheEnumDecl, LastEnumConst, IdLoc, Id, Val); 8471 8472 if (New) { 8473 // Process attributes. 8474 if (Attr) ProcessDeclAttributeList(S, New, Attr); 8475 8476 // Register this decl in the current scope stack. 8477 New->setAccess(TheEnumDecl->getAccess()); 8478 PushOnScopeChains(New, S); 8479 } 8480 8481 return New; 8482} 8483 8484void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc, 8485 SourceLocation RBraceLoc, Decl *EnumDeclX, 8486 Decl **Elements, unsigned NumElements, 8487 Scope *S, AttributeList *Attr) { 8488 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX); 8489 QualType EnumType = Context.getTypeDeclType(Enum); 8490 8491 if (Attr) 8492 ProcessDeclAttributeList(S, Enum, Attr); 8493 8494 if (Enum->isDependentType()) { 8495 for (unsigned i = 0; i != NumElements; ++i) { 8496 EnumConstantDecl *ECD = 8497 cast_or_null<EnumConstantDecl>(Elements[i]); 8498 if (!ECD) continue; 8499 8500 ECD->setType(EnumType); 8501 } 8502 8503 Enum->completeDefinition(Context.DependentTy, Context.DependentTy, 0, 0); 8504 return; 8505 } 8506 8507 // TODO: If the result value doesn't fit in an int, it must be a long or long 8508 // long value. ISO C does not support this, but GCC does as an extension, 8509 // emit a warning. 8510 unsigned IntWidth = Context.Target.getIntWidth(); 8511 unsigned CharWidth = Context.Target.getCharWidth(); 8512 unsigned ShortWidth = Context.Target.getShortWidth(); 8513 8514 // Verify that all the values are okay, compute the size of the values, and 8515 // reverse the list. 8516 unsigned NumNegativeBits = 0; 8517 unsigned NumPositiveBits = 0; 8518 8519 // Keep track of whether all elements have type int. 8520 bool AllElementsInt = true; 8521 8522 for (unsigned i = 0; i != NumElements; ++i) { 8523 EnumConstantDecl *ECD = 8524 cast_or_null<EnumConstantDecl>(Elements[i]); 8525 if (!ECD) continue; // Already issued a diagnostic. 8526 8527 const llvm::APSInt &InitVal = ECD->getInitVal(); 8528 8529 // Keep track of the size of positive and negative values. 8530 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 8531 NumPositiveBits = std::max(NumPositiveBits, 8532 (unsigned)InitVal.getActiveBits()); 8533 else 8534 NumNegativeBits = std::max(NumNegativeBits, 8535 (unsigned)InitVal.getMinSignedBits()); 8536 8537 // Keep track of whether every enum element has type int (very commmon). 8538 if (AllElementsInt) 8539 AllElementsInt = ECD->getType() == Context.IntTy; 8540 } 8541 8542 // Figure out the type that should be used for this enum. 8543 QualType BestType; 8544 unsigned BestWidth; 8545 8546 // C++0x N3000 [conv.prom]p3: 8547 // An rvalue of an unscoped enumeration type whose underlying 8548 // type is not fixed can be converted to an rvalue of the first 8549 // of the following types that can represent all the values of 8550 // the enumeration: int, unsigned int, long int, unsigned long 8551 // int, long long int, or unsigned long long int. 8552 // C99 6.4.4.3p2: 8553 // An identifier declared as an enumeration constant has type int. 8554 // The C99 rule is modified by a gcc extension 8555 QualType BestPromotionType; 8556 8557 bool Packed = Enum->getAttr<PackedAttr>() ? true : false; 8558 // -fshort-enums is the equivalent to specifying the packed attribute on all 8559 // enum definitions. 8560 if (LangOpts.ShortEnums) 8561 Packed = true; 8562 8563 if (Enum->isFixed()) { 8564 BestType = BestPromotionType = Enum->getIntegerType(); 8565 // We don't need to set BestWidth, because BestType is going to be the type 8566 // of the enumerators, but we do anyway because otherwise some compilers 8567 // warn that it might be used uninitialized. 8568 BestWidth = CharWidth; 8569 } 8570 else if (NumNegativeBits) { 8571 // If there is a negative value, figure out the smallest integer type (of 8572 // int/long/longlong) that fits. 8573 // If it's packed, check also if it fits a char or a short. 8574 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) { 8575 BestType = Context.SignedCharTy; 8576 BestWidth = CharWidth; 8577 } else if (Packed && NumNegativeBits <= ShortWidth && 8578 NumPositiveBits < ShortWidth) { 8579 BestType = Context.ShortTy; 8580 BestWidth = ShortWidth; 8581 } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 8582 BestType = Context.IntTy; 8583 BestWidth = IntWidth; 8584 } else { 8585 BestWidth = Context.Target.getLongWidth(); 8586 8587 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) { 8588 BestType = Context.LongTy; 8589 } else { 8590 BestWidth = Context.Target.getLongLongWidth(); 8591 8592 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 8593 Diag(Enum->getLocation(), diag::warn_enum_too_large); 8594 BestType = Context.LongLongTy; 8595 } 8596 } 8597 BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType); 8598 } else { 8599 // If there is no negative value, figure out the smallest type that fits 8600 // all of the enumerator values. 8601 // If it's packed, check also if it fits a char or a short. 8602 if (Packed && NumPositiveBits <= CharWidth) { 8603 BestType = Context.UnsignedCharTy; 8604 BestPromotionType = Context.IntTy; 8605 BestWidth = CharWidth; 8606 } else if (Packed && NumPositiveBits <= ShortWidth) { 8607 BestType = Context.UnsignedShortTy; 8608 BestPromotionType = Context.IntTy; 8609 BestWidth = ShortWidth; 8610 } else if (NumPositiveBits <= IntWidth) { 8611 BestType = Context.UnsignedIntTy; 8612 BestWidth = IntWidth; 8613 BestPromotionType 8614 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 8615 ? Context.UnsignedIntTy : Context.IntTy; 8616 } else if (NumPositiveBits <= 8617 (BestWidth = Context.Target.getLongWidth())) { 8618 BestType = Context.UnsignedLongTy; 8619 BestPromotionType 8620 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 8621 ? Context.UnsignedLongTy : Context.LongTy; 8622 } else { 8623 BestWidth = Context.Target.getLongLongWidth(); 8624 assert(NumPositiveBits <= BestWidth && 8625 "How could an initializer get larger than ULL?"); 8626 BestType = Context.UnsignedLongLongTy; 8627 BestPromotionType 8628 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 8629 ? Context.UnsignedLongLongTy : Context.LongLongTy; 8630 } 8631 } 8632 8633 // Loop over all of the enumerator constants, changing their types to match 8634 // the type of the enum if needed. 8635 for (unsigned i = 0; i != NumElements; ++i) { 8636 EnumConstantDecl *ECD = cast_or_null<EnumConstantDecl>(Elements[i]); 8637 if (!ECD) continue; // Already issued a diagnostic. 8638 8639 // Standard C says the enumerators have int type, but we allow, as an 8640 // extension, the enumerators to be larger than int size. If each 8641 // enumerator value fits in an int, type it as an int, otherwise type it the 8642 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 8643 // that X has type 'int', not 'unsigned'. 8644 8645 // Determine whether the value fits into an int. 8646 llvm::APSInt InitVal = ECD->getInitVal(); 8647 8648 // If it fits into an integer type, force it. Otherwise force it to match 8649 // the enum decl type. 8650 QualType NewTy; 8651 unsigned NewWidth; 8652 bool NewSign; 8653 if (!getLangOptions().CPlusPlus && 8654 isRepresentableIntegerValue(Context, InitVal, Context.IntTy)) { 8655 NewTy = Context.IntTy; 8656 NewWidth = IntWidth; 8657 NewSign = true; 8658 } else if (ECD->getType() == BestType) { 8659 // Already the right type! 8660 if (getLangOptions().CPlusPlus) 8661 // C++ [dcl.enum]p4: Following the closing brace of an 8662 // enum-specifier, each enumerator has the type of its 8663 // enumeration. 8664 ECD->setType(EnumType); 8665 continue; 8666 } else { 8667 NewTy = BestType; 8668 NewWidth = BestWidth; 8669 NewSign = BestType->isSignedIntegerType(); 8670 } 8671 8672 // Adjust the APSInt value. 8673 InitVal = InitVal.extOrTrunc(NewWidth); 8674 InitVal.setIsSigned(NewSign); 8675 ECD->setInitVal(InitVal); 8676 8677 // Adjust the Expr initializer and type. 8678 if (ECD->getInitExpr() && 8679 !Context.hasSameType(NewTy, ECD->getInitExpr()->getType())) 8680 ECD->setInitExpr(ImplicitCastExpr::Create(Context, NewTy, 8681 CK_IntegralCast, 8682 ECD->getInitExpr(), 8683 /*base paths*/ 0, 8684 VK_RValue)); 8685 if (getLangOptions().CPlusPlus) 8686 // C++ [dcl.enum]p4: Following the closing brace of an 8687 // enum-specifier, each enumerator has the type of its 8688 // enumeration. 8689 ECD->setType(EnumType); 8690 else 8691 ECD->setType(NewTy); 8692 } 8693 8694 Enum->completeDefinition(BestType, BestPromotionType, 8695 NumPositiveBits, NumNegativeBits); 8696} 8697 8698Decl *Sema::ActOnFileScopeAsmDecl(Expr *expr, 8699 SourceLocation StartLoc, 8700 SourceLocation EndLoc) { 8701 StringLiteral *AsmString = cast<StringLiteral>(expr); 8702 8703 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext, 8704 AsmString, StartLoc, 8705 EndLoc); 8706 CurContext->addDecl(New); 8707 return New; 8708} 8709 8710void Sema::ActOnPragmaWeakID(IdentifierInfo* Name, 8711 SourceLocation PragmaLoc, 8712 SourceLocation NameLoc) { 8713 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, LookupOrdinaryName); 8714 8715 if (PrevDecl) { 8716 PrevDecl->addAttr(::new (Context) WeakAttr(PragmaLoc, Context)); 8717 } else { 8718 (void)WeakUndeclaredIdentifiers.insert( 8719 std::pair<IdentifierInfo*,WeakInfo> 8720 (Name, WeakInfo((IdentifierInfo*)0, NameLoc))); 8721 } 8722} 8723 8724void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name, 8725 IdentifierInfo* AliasName, 8726 SourceLocation PragmaLoc, 8727 SourceLocation NameLoc, 8728 SourceLocation AliasNameLoc) { 8729 Decl *PrevDecl = LookupSingleName(TUScope, AliasName, AliasNameLoc, 8730 LookupOrdinaryName); 8731 WeakInfo W = WeakInfo(Name, NameLoc); 8732 8733 if (PrevDecl) { 8734 if (!PrevDecl->hasAttr<AliasAttr>()) 8735 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl)) 8736 DeclApplyPragmaWeak(TUScope, ND, W); 8737 } else { 8738 (void)WeakUndeclaredIdentifiers.insert( 8739 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W)); 8740 } 8741} 8742