SemaDecl.cpp revision 947be1941e9a1d4233116f51a45799d3904d4231
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 "clang/Lex/ModuleLoader.h" 42#include "llvm/ADT/Triple.h" 43#include <algorithm> 44#include <cstring> 45#include <functional> 46using namespace clang; 47using namespace sema; 48 49Sema::DeclGroupPtrTy Sema::ConvertDeclToDeclGroup(Decl *Ptr, Decl *OwnedType) { 50 if (OwnedType) { 51 Decl *Group[2] = { OwnedType, Ptr }; 52 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, 2)); 53 } 54 55 return DeclGroupPtrTy::make(DeclGroupRef(Ptr)); 56} 57 58/// \brief If the identifier refers to a type name within this scope, 59/// return the declaration of that type. 60/// 61/// This routine performs ordinary name lookup of the identifier II 62/// within the given scope, with optional C++ scope specifier SS, to 63/// determine whether the name refers to a type. If so, returns an 64/// opaque pointer (actually a QualType) corresponding to that 65/// type. Otherwise, returns NULL. 66/// 67/// If name lookup results in an ambiguity, this routine will complain 68/// and then return NULL. 69ParsedType Sema::getTypeName(IdentifierInfo &II, SourceLocation NameLoc, 70 Scope *S, CXXScopeSpec *SS, 71 bool isClassName, bool HasTrailingDot, 72 ParsedType ObjectTypePtr, 73 bool WantNontrivialTypeSourceInfo) { 74 // Determine where we will perform name lookup. 75 DeclContext *LookupCtx = 0; 76 if (ObjectTypePtr) { 77 QualType ObjectType = ObjectTypePtr.get(); 78 if (ObjectType->isRecordType()) 79 LookupCtx = computeDeclContext(ObjectType); 80 } else if (SS && SS->isNotEmpty()) { 81 LookupCtx = computeDeclContext(*SS, false); 82 83 if (!LookupCtx) { 84 if (isDependentScopeSpecifier(*SS)) { 85 // C++ [temp.res]p3: 86 // A qualified-id that refers to a type and in which the 87 // nested-name-specifier depends on a template-parameter (14.6.2) 88 // shall be prefixed by the keyword typename to indicate that the 89 // qualified-id denotes a type, forming an 90 // elaborated-type-specifier (7.1.5.3). 91 // 92 // We therefore do not perform any name lookup if the result would 93 // refer to a member of an unknown specialization. 94 if (!isClassName) 95 return ParsedType(); 96 97 // We know from the grammar that this name refers to a type, 98 // so build a dependent node to describe the type. 99 if (WantNontrivialTypeSourceInfo) 100 return ActOnTypenameType(S, SourceLocation(), *SS, II, NameLoc).get(); 101 102 NestedNameSpecifierLoc QualifierLoc = SS->getWithLocInContext(Context); 103 QualType T = 104 CheckTypenameType(ETK_None, SourceLocation(), QualifierLoc, 105 II, NameLoc); 106 107 return ParsedType::make(T); 108 } 109 110 return ParsedType(); 111 } 112 113 if (!LookupCtx->isDependentContext() && 114 RequireCompleteDeclContext(*SS, LookupCtx)) 115 return ParsedType(); 116 } 117 118 // FIXME: LookupNestedNameSpecifierName isn't the right kind of 119 // lookup for class-names. 120 LookupNameKind Kind = isClassName ? LookupNestedNameSpecifierName : 121 LookupOrdinaryName; 122 LookupResult Result(*this, &II, NameLoc, Kind); 123 if (LookupCtx) { 124 // Perform "qualified" name lookup into the declaration context we 125 // computed, which is either the type of the base of a member access 126 // expression or the declaration context associated with a prior 127 // nested-name-specifier. 128 LookupQualifiedName(Result, LookupCtx); 129 130 if (ObjectTypePtr && Result.empty()) { 131 // C++ [basic.lookup.classref]p3: 132 // If the unqualified-id is ~type-name, the type-name is looked up 133 // in the context of the entire postfix-expression. If the type T of 134 // the object expression is of a class type C, the type-name is also 135 // looked up in the scope of class C. At least one of the lookups shall 136 // find a name that refers to (possibly cv-qualified) T. 137 LookupName(Result, S); 138 } 139 } else { 140 // Perform unqualified name lookup. 141 LookupName(Result, S); 142 } 143 144 NamedDecl *IIDecl = 0; 145 switch (Result.getResultKind()) { 146 case LookupResult::NotFound: 147 case LookupResult::NotFoundInCurrentInstantiation: 148 case LookupResult::FoundOverloaded: 149 case LookupResult::FoundUnresolvedValue: 150 Result.suppressDiagnostics(); 151 return ParsedType(); 152 153 case LookupResult::Ambiguous: 154 // Recover from type-hiding ambiguities by hiding the type. We'll 155 // do the lookup again when looking for an object, and we can 156 // diagnose the error then. If we don't do this, then the error 157 // about hiding the type will be immediately followed by an error 158 // that only makes sense if the identifier was treated like a type. 159 if (Result.getAmbiguityKind() == LookupResult::AmbiguousTagHiding) { 160 Result.suppressDiagnostics(); 161 return ParsedType(); 162 } 163 164 // Look to see if we have a type anywhere in the list of results. 165 for (LookupResult::iterator Res = Result.begin(), ResEnd = Result.end(); 166 Res != ResEnd; ++Res) { 167 if (isa<TypeDecl>(*Res) || isa<ObjCInterfaceDecl>(*Res)) { 168 if (!IIDecl || 169 (*Res)->getLocation().getRawEncoding() < 170 IIDecl->getLocation().getRawEncoding()) 171 IIDecl = *Res; 172 } 173 } 174 175 if (!IIDecl) { 176 // None of the entities we found is a type, so there is no way 177 // to even assume that the result is a type. In this case, don't 178 // complain about the ambiguity. The parser will either try to 179 // perform this lookup again (e.g., as an object name), which 180 // will produce the ambiguity, or will complain that it expected 181 // a type name. 182 Result.suppressDiagnostics(); 183 return ParsedType(); 184 } 185 186 // We found a type within the ambiguous lookup; diagnose the 187 // ambiguity and then return that type. This might be the right 188 // answer, or it might not be, but it suppresses any attempt to 189 // perform the name lookup again. 190 break; 191 192 case LookupResult::Found: 193 IIDecl = Result.getFoundDecl(); 194 break; 195 } 196 197 assert(IIDecl && "Didn't find decl"); 198 199 QualType T; 200 if (TypeDecl *TD = dyn_cast<TypeDecl>(IIDecl)) { 201 DiagnoseUseOfDecl(IIDecl, NameLoc); 202 203 if (T.isNull()) 204 T = Context.getTypeDeclType(TD); 205 206 if (SS && SS->isNotEmpty()) { 207 if (WantNontrivialTypeSourceInfo) { 208 // Construct a type with type-source information. 209 TypeLocBuilder Builder; 210 Builder.pushTypeSpec(T).setNameLoc(NameLoc); 211 212 T = getElaboratedType(ETK_None, *SS, T); 213 ElaboratedTypeLoc ElabTL = Builder.push<ElaboratedTypeLoc>(T); 214 ElabTL.setKeywordLoc(SourceLocation()); 215 ElabTL.setQualifierLoc(SS->getWithLocInContext(Context)); 216 return CreateParsedType(T, Builder.getTypeSourceInfo(Context, T)); 217 } else { 218 T = getElaboratedType(ETK_None, *SS, T); 219 } 220 } 221 } else if (ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(IIDecl)) { 222 (void)DiagnoseUseOfDecl(IDecl, NameLoc); 223 if (!HasTrailingDot) 224 T = Context.getObjCInterfaceType(IDecl); 225 } 226 227 if (T.isNull()) { 228 // If it's not plausibly a type, suppress diagnostics. 229 Result.suppressDiagnostics(); 230 return ParsedType(); 231 } 232 return ParsedType::make(T); 233} 234 235/// isTagName() - This method is called *for error recovery purposes only* 236/// to determine if the specified name is a valid tag name ("struct foo"). If 237/// so, this returns the TST for the tag corresponding to it (TST_enum, 238/// TST_union, TST_struct, TST_class). This is used to diagnose cases in C 239/// where the user forgot to specify the tag. 240DeclSpec::TST Sema::isTagName(IdentifierInfo &II, Scope *S) { 241 // Do a tag name lookup in this scope. 242 LookupResult R(*this, &II, SourceLocation(), LookupTagName); 243 LookupName(R, S, false); 244 R.suppressDiagnostics(); 245 if (R.getResultKind() == LookupResult::Found) 246 if (const TagDecl *TD = R.getAsSingle<TagDecl>()) { 247 switch (TD->getTagKind()) { 248 default: return DeclSpec::TST_unspecified; 249 case TTK_Struct: return DeclSpec::TST_struct; 250 case TTK_Union: return DeclSpec::TST_union; 251 case TTK_Class: return DeclSpec::TST_class; 252 case TTK_Enum: return DeclSpec::TST_enum; 253 } 254 } 255 256 return DeclSpec::TST_unspecified; 257} 258 259/// isMicrosoftMissingTypename - In Microsoft mode, within class scope, 260/// if a CXXScopeSpec's type is equal to the type of one of the base classes 261/// then downgrade the missing typename error to a warning. 262/// This is needed for MSVC compatibility; Example: 263/// @code 264/// template<class T> class A { 265/// public: 266/// typedef int TYPE; 267/// }; 268/// template<class T> class B : public A<T> { 269/// public: 270/// A<T>::TYPE a; // no typename required because A<T> is a base class. 271/// }; 272/// @endcode 273bool Sema::isMicrosoftMissingTypename(const CXXScopeSpec *SS) { 274 if (CurContext->isRecord()) { 275 const Type *Ty = SS->getScopeRep()->getAsType(); 276 277 CXXRecordDecl *RD = cast<CXXRecordDecl>(CurContext); 278 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 279 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) 280 if (Context.hasSameUnqualifiedType(QualType(Ty, 1), Base->getType())) 281 return true; 282 } 283 return CurContext->isFunctionOrMethod(); 284} 285 286bool Sema::DiagnoseUnknownTypeName(const IdentifierInfo &II, 287 SourceLocation IILoc, 288 Scope *S, 289 CXXScopeSpec *SS, 290 ParsedType &SuggestedType) { 291 // We don't have anything to suggest (yet). 292 SuggestedType = ParsedType(); 293 294 // There may have been a typo in the name of the type. Look up typo 295 // results, in case we have something that we can suggest. 296 if (TypoCorrection Corrected = CorrectTypo(DeclarationNameInfo(&II, IILoc), 297 LookupOrdinaryName, S, SS, NULL, 298 false, CTC_Type)) { 299 std::string CorrectedStr(Corrected.getAsString(getLangOptions())); 300 std::string CorrectedQuotedStr(Corrected.getQuoted(getLangOptions())); 301 302 if (Corrected.isKeyword()) { 303 // We corrected to a keyword. 304 // FIXME: Actually recover with the keyword we suggest, and emit a fix-it. 305 Diag(IILoc, diag::err_unknown_typename_suggest) 306 << &II << CorrectedQuotedStr; 307 return true; 308 } else { 309 NamedDecl *Result = Corrected.getCorrectionDecl(); 310 if ((isa<TypeDecl>(Result) || isa<ObjCInterfaceDecl>(Result)) && 311 !Result->isInvalidDecl()) { 312 // We found a similarly-named type or interface; suggest that. 313 if (!SS || !SS->isSet()) 314 Diag(IILoc, diag::err_unknown_typename_suggest) 315 << &II << CorrectedQuotedStr 316 << FixItHint::CreateReplacement(SourceRange(IILoc), CorrectedStr); 317 else if (DeclContext *DC = computeDeclContext(*SS, false)) 318 Diag(IILoc, diag::err_unknown_nested_typename_suggest) 319 << &II << DC << CorrectedQuotedStr << SS->getRange() 320 << FixItHint::CreateReplacement(SourceRange(IILoc), CorrectedStr); 321 else 322 llvm_unreachable("could not have corrected a typo here"); 323 324 Diag(Result->getLocation(), diag::note_previous_decl) 325 << CorrectedQuotedStr; 326 327 SuggestedType = getTypeName(*Result->getIdentifier(), IILoc, S, SS, 328 false, false, ParsedType(), 329 /*NonTrivialTypeSourceInfo=*/true); 330 return true; 331 } 332 } 333 } 334 335 if (getLangOptions().CPlusPlus) { 336 // See if II is a class template that the user forgot to pass arguments to. 337 UnqualifiedId Name; 338 Name.setIdentifier(&II, IILoc); 339 CXXScopeSpec EmptySS; 340 TemplateTy TemplateResult; 341 bool MemberOfUnknownSpecialization; 342 if (isTemplateName(S, SS ? *SS : EmptySS, /*hasTemplateKeyword=*/false, 343 Name, ParsedType(), true, TemplateResult, 344 MemberOfUnknownSpecialization) == TNK_Type_template) { 345 TemplateName TplName = TemplateResult.getAsVal<TemplateName>(); 346 Diag(IILoc, diag::err_template_missing_args) << TplName; 347 if (TemplateDecl *TplDecl = TplName.getAsTemplateDecl()) { 348 Diag(TplDecl->getLocation(), diag::note_template_decl_here) 349 << TplDecl->getTemplateParameters()->getSourceRange(); 350 } 351 return true; 352 } 353 } 354 355 // FIXME: Should we move the logic that tries to recover from a missing tag 356 // (struct, union, enum) from Parser::ParseImplicitInt here, instead? 357 358 if (!SS || (!SS->isSet() && !SS->isInvalid())) 359 Diag(IILoc, diag::err_unknown_typename) << &II; 360 else if (DeclContext *DC = computeDeclContext(*SS, false)) 361 Diag(IILoc, diag::err_typename_nested_not_found) 362 << &II << DC << SS->getRange(); 363 else if (isDependentScopeSpecifier(*SS)) { 364 unsigned DiagID = diag::err_typename_missing; 365 if (getLangOptions().MicrosoftMode && isMicrosoftMissingTypename(SS)) 366 DiagID = diag::warn_typename_missing; 367 368 Diag(SS->getRange().getBegin(), DiagID) 369 << (NestedNameSpecifier *)SS->getScopeRep() << II.getName() 370 << SourceRange(SS->getRange().getBegin(), IILoc) 371 << FixItHint::CreateInsertion(SS->getRange().getBegin(), "typename "); 372 SuggestedType = ActOnTypenameType(S, SourceLocation(), *SS, II, IILoc).get(); 373 } else { 374 assert(SS && SS->isInvalid() && 375 "Invalid scope specifier has already been diagnosed"); 376 } 377 378 return true; 379} 380 381/// \brief Determine whether the given result set contains either a type name 382/// or 383static bool isResultTypeOrTemplate(LookupResult &R, const Token &NextToken) { 384 bool CheckTemplate = R.getSema().getLangOptions().CPlusPlus && 385 NextToken.is(tok::less); 386 387 for (LookupResult::iterator I = R.begin(), IEnd = R.end(); I != IEnd; ++I) { 388 if (isa<TypeDecl>(*I) || isa<ObjCInterfaceDecl>(*I)) 389 return true; 390 391 if (CheckTemplate && isa<TemplateDecl>(*I)) 392 return true; 393 } 394 395 return false; 396} 397 398Sema::NameClassification Sema::ClassifyName(Scope *S, 399 CXXScopeSpec &SS, 400 IdentifierInfo *&Name, 401 SourceLocation NameLoc, 402 const Token &NextToken) { 403 DeclarationNameInfo NameInfo(Name, NameLoc); 404 ObjCMethodDecl *CurMethod = getCurMethodDecl(); 405 406 if (NextToken.is(tok::coloncolon)) { 407 BuildCXXNestedNameSpecifier(S, *Name, NameLoc, NextToken.getLocation(), 408 QualType(), false, SS, 0, false); 409 410 } 411 412 LookupResult Result(*this, Name, NameLoc, LookupOrdinaryName); 413 LookupParsedName(Result, S, &SS, !CurMethod); 414 415 // Perform lookup for Objective-C instance variables (including automatically 416 // synthesized instance variables), if we're in an Objective-C method. 417 // FIXME: This lookup really, really needs to be folded in to the normal 418 // unqualified lookup mechanism. 419 if (!SS.isSet() && CurMethod && !isResultTypeOrTemplate(Result, NextToken)) { 420 ExprResult E = LookupInObjCMethod(Result, S, Name, true); 421 if (E.get() || E.isInvalid()) 422 return E; 423 } 424 425 bool SecondTry = false; 426 bool IsFilteredTemplateName = false; 427 428Corrected: 429 switch (Result.getResultKind()) { 430 case LookupResult::NotFound: 431 // If an unqualified-id is followed by a '(', then we have a function 432 // call. 433 if (!SS.isSet() && NextToken.is(tok::l_paren)) { 434 // In C++, this is an ADL-only call. 435 // FIXME: Reference? 436 if (getLangOptions().CPlusPlus) 437 return BuildDeclarationNameExpr(SS, Result, /*ADL=*/true); 438 439 // C90 6.3.2.2: 440 // If the expression that precedes the parenthesized argument list in a 441 // function call consists solely of an identifier, and if no 442 // declaration is visible for this identifier, the identifier is 443 // implicitly declared exactly as if, in the innermost block containing 444 // the function call, the declaration 445 // 446 // extern int identifier (); 447 // 448 // appeared. 449 // 450 // We also allow this in C99 as an extension. 451 if (NamedDecl *D = ImplicitlyDefineFunction(NameLoc, *Name, S)) { 452 Result.addDecl(D); 453 Result.resolveKind(); 454 return BuildDeclarationNameExpr(SS, Result, /*ADL=*/false); 455 } 456 } 457 458 // In C, we first see whether there is a tag type by the same name, in 459 // which case it's likely that the user just forget to write "enum", 460 // "struct", or "union". 461 if (!getLangOptions().CPlusPlus && !SecondTry) { 462 Result.clear(LookupTagName); 463 LookupParsedName(Result, S, &SS); 464 if (TagDecl *Tag = Result.getAsSingle<TagDecl>()) { 465 const char *TagName = 0; 466 const char *FixItTagName = 0; 467 switch (Tag->getTagKind()) { 468 case TTK_Class: 469 TagName = "class"; 470 FixItTagName = "class "; 471 break; 472 473 case TTK_Enum: 474 TagName = "enum"; 475 FixItTagName = "enum "; 476 break; 477 478 case TTK_Struct: 479 TagName = "struct"; 480 FixItTagName = "struct "; 481 break; 482 483 case TTK_Union: 484 TagName = "union"; 485 FixItTagName = "union "; 486 break; 487 } 488 489 Diag(NameLoc, diag::err_use_of_tag_name_without_tag) 490 << Name << TagName << getLangOptions().CPlusPlus 491 << FixItHint::CreateInsertion(NameLoc, FixItTagName); 492 break; 493 } 494 495 Result.clear(LookupOrdinaryName); 496 } 497 498 // Perform typo correction to determine if there is another name that is 499 // close to this name. 500 if (!SecondTry) { 501 SecondTry = true; 502 if (TypoCorrection Corrected = CorrectTypo(Result.getLookupNameInfo(), 503 Result.getLookupKind(), S, &SS)) { 504 unsigned UnqualifiedDiag = diag::err_undeclared_var_use_suggest; 505 unsigned QualifiedDiag = diag::err_no_member_suggest; 506 std::string CorrectedStr(Corrected.getAsString(getLangOptions())); 507 std::string CorrectedQuotedStr(Corrected.getQuoted(getLangOptions())); 508 509 NamedDecl *FirstDecl = Corrected.getCorrectionDecl(); 510 NamedDecl *UnderlyingFirstDecl 511 = FirstDecl? FirstDecl->getUnderlyingDecl() : 0; 512 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) && 513 UnderlyingFirstDecl && isa<TemplateDecl>(UnderlyingFirstDecl)) { 514 UnqualifiedDiag = diag::err_no_template_suggest; 515 QualifiedDiag = diag::err_no_member_template_suggest; 516 } else if (UnderlyingFirstDecl && 517 (isa<TypeDecl>(UnderlyingFirstDecl) || 518 isa<ObjCInterfaceDecl>(UnderlyingFirstDecl) || 519 isa<ObjCCompatibleAliasDecl>(UnderlyingFirstDecl))) { 520 UnqualifiedDiag = diag::err_unknown_typename_suggest; 521 QualifiedDiag = diag::err_unknown_nested_typename_suggest; 522 } 523 524 if (SS.isEmpty()) 525 Diag(NameLoc, UnqualifiedDiag) 526 << Name << CorrectedQuotedStr 527 << FixItHint::CreateReplacement(NameLoc, CorrectedStr); 528 else 529 Diag(NameLoc, QualifiedDiag) 530 << Name << computeDeclContext(SS, false) << CorrectedQuotedStr 531 << SS.getRange() 532 << FixItHint::CreateReplacement(NameLoc, CorrectedStr); 533 534 // Update the name, so that the caller has the new name. 535 Name = Corrected.getCorrectionAsIdentifierInfo(); 536 537 // Also update the LookupResult... 538 // FIXME: This should probably go away at some point 539 Result.clear(); 540 Result.setLookupName(Corrected.getCorrection()); 541 if (FirstDecl) Result.addDecl(FirstDecl); 542 543 // Typo correction corrected to a keyword. 544 if (Corrected.isKeyword()) 545 return Corrected.getCorrectionAsIdentifierInfo(); 546 547 if (FirstDecl) 548 Diag(FirstDecl->getLocation(), diag::note_previous_decl) 549 << CorrectedQuotedStr; 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 return DC->getLexicalParent(); 724} 725 726void Sema::PushDeclContext(Scope *S, DeclContext *DC) { 727 assert(getContainingDC(DC) == CurContext && 728 "The next DeclContext should be lexically contained in the current one."); 729 CurContext = DC; 730 S->setEntity(DC); 731} 732 733void Sema::PopDeclContext() { 734 assert(CurContext && "DeclContext imbalance!"); 735 736 CurContext = getContainingDC(CurContext); 737 assert(CurContext && "Popped translation unit!"); 738} 739 740/// EnterDeclaratorContext - Used when we must lookup names in the context 741/// of a declarator's nested name specifier. 742/// 743void Sema::EnterDeclaratorContext(Scope *S, DeclContext *DC) { 744 // C++0x [basic.lookup.unqual]p13: 745 // A name used in the definition of a static data member of class 746 // X (after the qualified-id of the static member) is looked up as 747 // if the name was used in a member function of X. 748 // C++0x [basic.lookup.unqual]p14: 749 // If a variable member of a namespace is defined outside of the 750 // scope of its namespace then any name used in the definition of 751 // the variable member (after the declarator-id) is looked up as 752 // if the definition of the variable member occurred in its 753 // namespace. 754 // Both of these imply that we should push a scope whose context 755 // is the semantic context of the declaration. We can't use 756 // PushDeclContext here because that context is not necessarily 757 // lexically contained in the current context. Fortunately, 758 // the containing scope should have the appropriate information. 759 760 assert(!S->getEntity() && "scope already has entity"); 761 762#ifndef NDEBUG 763 Scope *Ancestor = S->getParent(); 764 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 765 assert(Ancestor->getEntity() == CurContext && "ancestor context mismatch"); 766#endif 767 768 CurContext = DC; 769 S->setEntity(DC); 770} 771 772void Sema::ExitDeclaratorContext(Scope *S) { 773 assert(S->getEntity() == CurContext && "Context imbalance!"); 774 775 // Switch back to the lexical context. The safety of this is 776 // enforced by an assert in EnterDeclaratorContext. 777 Scope *Ancestor = S->getParent(); 778 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 779 CurContext = (DeclContext*) Ancestor->getEntity(); 780 781 // We don't need to do anything with the scope, which is going to 782 // disappear. 783} 784 785 786void Sema::ActOnReenterFunctionContext(Scope* S, Decl *D) { 787 FunctionDecl *FD = dyn_cast<FunctionDecl>(D); 788 if (FunctionTemplateDecl *TFD = dyn_cast_or_null<FunctionTemplateDecl>(D)) { 789 // We assume that the caller has already called 790 // ActOnReenterTemplateScope 791 FD = TFD->getTemplatedDecl(); 792 } 793 if (!FD) 794 return; 795 796 PushDeclContext(S, FD); 797 for (unsigned P = 0, NumParams = FD->getNumParams(); P < NumParams; ++P) { 798 ParmVarDecl *Param = FD->getParamDecl(P); 799 // If the parameter has an identifier, then add it to the scope 800 if (Param->getIdentifier()) { 801 S->AddDecl(Param); 802 IdResolver.AddDecl(Param); 803 } 804 } 805} 806 807 808/// \brief Determine whether we allow overloading of the function 809/// PrevDecl with another declaration. 810/// 811/// This routine determines whether overloading is possible, not 812/// whether some new function is actually an overload. It will return 813/// true in C++ (where we can always provide overloads) or, as an 814/// extension, in C when the previous function is already an 815/// overloaded function declaration or has the "overloadable" 816/// attribute. 817static bool AllowOverloadingOfFunction(LookupResult &Previous, 818 ASTContext &Context) { 819 if (Context.getLangOptions().CPlusPlus) 820 return true; 821 822 if (Previous.getResultKind() == LookupResult::FoundOverloaded) 823 return true; 824 825 return (Previous.getResultKind() == LookupResult::Found 826 && Previous.getFoundDecl()->hasAttr<OverloadableAttr>()); 827} 828 829/// Add this decl to the scope shadowed decl chains. 830void Sema::PushOnScopeChains(NamedDecl *D, Scope *S, bool AddToContext) { 831 // Move up the scope chain until we find the nearest enclosing 832 // non-transparent context. The declaration will be introduced into this 833 // scope. 834 while (S->getEntity() && 835 ((DeclContext *)S->getEntity())->isTransparentContext()) 836 S = S->getParent(); 837 838 // Add scoped declarations into their context, so that they can be 839 // found later. Declarations without a context won't be inserted 840 // into any context. 841 if (AddToContext) 842 CurContext->addDecl(D); 843 844 // Out-of-line definitions shouldn't be pushed into scope in C++. 845 // Out-of-line variable and function definitions shouldn't even in C. 846 if ((getLangOptions().CPlusPlus || isa<VarDecl>(D) || isa<FunctionDecl>(D)) && 847 D->isOutOfLine()) 848 return; 849 850 // Template instantiations should also not be pushed into scope. 851 if (isa<FunctionDecl>(D) && 852 cast<FunctionDecl>(D)->isFunctionTemplateSpecialization()) 853 return; 854 855 // If this replaces anything in the current scope, 856 IdentifierResolver::iterator I = IdResolver.begin(D->getDeclName()), 857 IEnd = IdResolver.end(); 858 for (; I != IEnd; ++I) { 859 if (S->isDeclScope(*I) && D->declarationReplaces(*I)) { 860 S->RemoveDecl(*I); 861 IdResolver.RemoveDecl(*I); 862 863 // Should only need to replace one decl. 864 break; 865 } 866 } 867 868 S->AddDecl(D); 869 870 if (isa<LabelDecl>(D) && !cast<LabelDecl>(D)->isGnuLocal()) { 871 // Implicitly-generated labels may end up getting generated in an order that 872 // isn't strictly lexical, which breaks name lookup. Be careful to insert 873 // the label at the appropriate place in the identifier chain. 874 for (I = IdResolver.begin(D->getDeclName()); I != IEnd; ++I) { 875 DeclContext *IDC = (*I)->getLexicalDeclContext()->getRedeclContext(); 876 if (IDC == CurContext) { 877 if (!S->isDeclScope(*I)) 878 continue; 879 } else if (IDC->Encloses(CurContext)) 880 break; 881 } 882 883 IdResolver.InsertDeclAfter(I, D); 884 } else { 885 IdResolver.AddDecl(D); 886 } 887} 888 889bool Sema::isDeclInScope(NamedDecl *&D, DeclContext *Ctx, Scope *S, 890 bool ExplicitInstantiationOrSpecialization) { 891 return IdResolver.isDeclInScope(D, Ctx, Context, S, 892 ExplicitInstantiationOrSpecialization); 893} 894 895Scope *Sema::getScopeForDeclContext(Scope *S, DeclContext *DC) { 896 DeclContext *TargetDC = DC->getPrimaryContext(); 897 do { 898 if (DeclContext *ScopeDC = (DeclContext*) S->getEntity()) 899 if (ScopeDC->getPrimaryContext() == TargetDC) 900 return S; 901 } while ((S = S->getParent())); 902 903 return 0; 904} 905 906static bool isOutOfScopePreviousDeclaration(NamedDecl *, 907 DeclContext*, 908 ASTContext&); 909 910/// Filters out lookup results that don't fall within the given scope 911/// as determined by isDeclInScope. 912void Sema::FilterLookupForScope(LookupResult &R, 913 DeclContext *Ctx, Scope *S, 914 bool ConsiderLinkage, 915 bool ExplicitInstantiationOrSpecialization) { 916 LookupResult::Filter F = R.makeFilter(); 917 while (F.hasNext()) { 918 NamedDecl *D = F.next(); 919 920 if (isDeclInScope(D, Ctx, S, ExplicitInstantiationOrSpecialization)) 921 continue; 922 923 if (ConsiderLinkage && 924 isOutOfScopePreviousDeclaration(D, Ctx, Context)) 925 continue; 926 927 F.erase(); 928 } 929 930 F.done(); 931} 932 933static bool isUsingDecl(NamedDecl *D) { 934 return isa<UsingShadowDecl>(D) || 935 isa<UnresolvedUsingTypenameDecl>(D) || 936 isa<UnresolvedUsingValueDecl>(D); 937} 938 939/// Removes using shadow declarations from the lookup results. 940static void RemoveUsingDecls(LookupResult &R) { 941 LookupResult::Filter F = R.makeFilter(); 942 while (F.hasNext()) 943 if (isUsingDecl(F.next())) 944 F.erase(); 945 946 F.done(); 947} 948 949/// \brief Check for this common pattern: 950/// @code 951/// class S { 952/// S(const S&); // DO NOT IMPLEMENT 953/// void operator=(const S&); // DO NOT IMPLEMENT 954/// }; 955/// @endcode 956static bool IsDisallowedCopyOrAssign(const CXXMethodDecl *D) { 957 // FIXME: Should check for private access too but access is set after we get 958 // the decl here. 959 if (D->doesThisDeclarationHaveABody()) 960 return false; 961 962 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(D)) 963 return CD->isCopyConstructor(); 964 if (const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 965 return Method->isCopyAssignmentOperator(); 966 return false; 967} 968 969bool Sema::ShouldWarnIfUnusedFileScopedDecl(const DeclaratorDecl *D) const { 970 assert(D); 971 972 if (D->isInvalidDecl() || D->isUsed() || D->hasAttr<UnusedAttr>()) 973 return false; 974 975 // Ignore class templates. 976 if (D->getDeclContext()->isDependentContext() || 977 D->getLexicalDeclContext()->isDependentContext()) 978 return false; 979 980 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 981 if (FD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 982 return false; 983 984 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 985 if (MD->isVirtual() || IsDisallowedCopyOrAssign(MD)) 986 return false; 987 } else { 988 // 'static inline' functions are used in headers; don't warn. 989 if (FD->getStorageClass() == SC_Static && 990 FD->isInlineSpecified()) 991 return false; 992 } 993 994 if (FD->doesThisDeclarationHaveABody() && 995 Context.DeclMustBeEmitted(FD)) 996 return false; 997 } else if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 998 if (!VD->isFileVarDecl() || 999 VD->getType().isConstant(Context) || 1000 Context.DeclMustBeEmitted(VD)) 1001 return false; 1002 1003 if (VD->isStaticDataMember() && 1004 VD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 1005 return false; 1006 1007 } else { 1008 return false; 1009 } 1010 1011 // Only warn for unused decls internal to the translation unit. 1012 if (D->getLinkage() == ExternalLinkage) 1013 return false; 1014 1015 return true; 1016} 1017 1018void Sema::MarkUnusedFileScopedDecl(const DeclaratorDecl *D) { 1019 if (!D) 1020 return; 1021 1022 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 1023 const FunctionDecl *First = FD->getFirstDeclaration(); 1024 if (FD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 1025 return; // First should already be in the vector. 1026 } 1027 1028 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1029 const VarDecl *First = VD->getFirstDeclaration(); 1030 if (VD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 1031 return; // First should already be in the vector. 1032 } 1033 1034 if (ShouldWarnIfUnusedFileScopedDecl(D)) 1035 UnusedFileScopedDecls.push_back(D); 1036 } 1037 1038static bool ShouldDiagnoseUnusedDecl(const NamedDecl *D) { 1039 if (D->isInvalidDecl()) 1040 return false; 1041 1042 if (D->isUsed() || D->hasAttr<UnusedAttr>()) 1043 return false; 1044 1045 if (isa<LabelDecl>(D)) 1046 return true; 1047 1048 // White-list anything that isn't a local variable. 1049 if (!isa<VarDecl>(D) || isa<ParmVarDecl>(D) || isa<ImplicitParamDecl>(D) || 1050 !D->getDeclContext()->isFunctionOrMethod()) 1051 return false; 1052 1053 // Types of valid local variables should be complete, so this should succeed. 1054 if (const ValueDecl *VD = dyn_cast<ValueDecl>(D)) { 1055 1056 // White-list anything with an __attribute__((unused)) type. 1057 QualType Ty = VD->getType(); 1058 1059 // Only look at the outermost level of typedef. 1060 if (const TypedefType *TT = dyn_cast<TypedefType>(Ty)) { 1061 if (TT->getDecl()->hasAttr<UnusedAttr>()) 1062 return false; 1063 } 1064 1065 // If we failed to complete the type for some reason, or if the type is 1066 // dependent, don't diagnose the variable. 1067 if (Ty->isIncompleteType() || Ty->isDependentType()) 1068 return false; 1069 1070 if (const TagType *TT = Ty->getAs<TagType>()) { 1071 const TagDecl *Tag = TT->getDecl(); 1072 if (Tag->hasAttr<UnusedAttr>()) 1073 return false; 1074 1075 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Tag)) { 1076 // FIXME: Checking for the presence of a user-declared constructor 1077 // isn't completely accurate; we'd prefer to check that the initializer 1078 // has no side effects. 1079 if (RD->hasUserDeclaredConstructor() || !RD->hasTrivialDestructor()) 1080 return false; 1081 } 1082 } 1083 1084 // TODO: __attribute__((unused)) templates? 1085 } 1086 1087 return true; 1088} 1089 1090static void GenerateFixForUnusedDecl(const NamedDecl *D, ASTContext &Ctx, 1091 FixItHint &Hint) { 1092 if (isa<LabelDecl>(D)) { 1093 SourceLocation AfterColon = Lexer::findLocationAfterToken(D->getLocEnd(), 1094 tok::colon, Ctx.getSourceManager(), Ctx.getLangOptions(), true); 1095 if (AfterColon.isInvalid()) 1096 return; 1097 Hint = FixItHint::CreateRemoval(CharSourceRange:: 1098 getCharRange(D->getLocStart(), AfterColon)); 1099 } 1100 return; 1101} 1102 1103/// DiagnoseUnusedDecl - Emit warnings about declarations that are not used 1104/// unless they are marked attr(unused). 1105void Sema::DiagnoseUnusedDecl(const NamedDecl *D) { 1106 FixItHint Hint; 1107 if (!ShouldDiagnoseUnusedDecl(D)) 1108 return; 1109 1110 GenerateFixForUnusedDecl(D, Context, Hint); 1111 1112 unsigned DiagID; 1113 if (isa<VarDecl>(D) && cast<VarDecl>(D)->isExceptionVariable()) 1114 DiagID = diag::warn_unused_exception_param; 1115 else if (isa<LabelDecl>(D)) 1116 DiagID = diag::warn_unused_label; 1117 else 1118 DiagID = diag::warn_unused_variable; 1119 1120 Diag(D->getLocation(), DiagID) << D->getDeclName() << Hint; 1121} 1122 1123static void CheckPoppedLabel(LabelDecl *L, Sema &S) { 1124 // Verify that we have no forward references left. If so, there was a goto 1125 // or address of a label taken, but no definition of it. Label fwd 1126 // definitions are indicated with a null substmt. 1127 if (L->getStmt() == 0) 1128 S.Diag(L->getLocation(), diag::err_undeclared_label_use) <<L->getDeclName(); 1129} 1130 1131void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) { 1132 if (S->decl_empty()) return; 1133 assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) && 1134 "Scope shouldn't contain decls!"); 1135 1136 for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end(); 1137 I != E; ++I) { 1138 Decl *TmpD = (*I); 1139 assert(TmpD && "This decl didn't get pushed??"); 1140 1141 assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?"); 1142 NamedDecl *D = cast<NamedDecl>(TmpD); 1143 1144 if (!D->getDeclName()) continue; 1145 1146 // Diagnose unused variables in this scope. 1147 if (!S->hasErrorOccurred()) 1148 DiagnoseUnusedDecl(D); 1149 1150 // If this was a forward reference to a label, verify it was defined. 1151 if (LabelDecl *LD = dyn_cast<LabelDecl>(D)) 1152 CheckPoppedLabel(LD, *this); 1153 1154 // Remove this name from our lexical scope. 1155 IdResolver.RemoveDecl(D); 1156 } 1157} 1158 1159/// \brief Look for an Objective-C class in the translation unit. 1160/// 1161/// \param Id The name of the Objective-C class we're looking for. If 1162/// typo-correction fixes this name, the Id will be updated 1163/// to the fixed name. 1164/// 1165/// \param IdLoc The location of the name in the translation unit. 1166/// 1167/// \param TypoCorrection If true, this routine will attempt typo correction 1168/// if there is no class with the given name. 1169/// 1170/// \returns The declaration of the named Objective-C class, or NULL if the 1171/// class could not be found. 1172ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *&Id, 1173 SourceLocation IdLoc, 1174 bool DoTypoCorrection) { 1175 // The third "scope" argument is 0 since we aren't enabling lazy built-in 1176 // creation from this context. 1177 NamedDecl *IDecl = LookupSingleName(TUScope, Id, IdLoc, LookupOrdinaryName); 1178 1179 if (!IDecl && DoTypoCorrection) { 1180 // Perform typo correction at the given location, but only if we 1181 // find an Objective-C class name. 1182 TypoCorrection C; 1183 if ((C = CorrectTypo(DeclarationNameInfo(Id, IdLoc), LookupOrdinaryName, 1184 TUScope, NULL, NULL, false, CTC_NoKeywords)) && 1185 (IDecl = C.getCorrectionDeclAs<ObjCInterfaceDecl>())) { 1186 Diag(IdLoc, diag::err_undef_interface_suggest) 1187 << Id << IDecl->getDeclName() 1188 << FixItHint::CreateReplacement(IdLoc, IDecl->getNameAsString()); 1189 Diag(IDecl->getLocation(), diag::note_previous_decl) 1190 << IDecl->getDeclName(); 1191 1192 Id = IDecl->getIdentifier(); 1193 } 1194 } 1195 1196 return dyn_cast_or_null<ObjCInterfaceDecl>(IDecl); 1197} 1198 1199/// getNonFieldDeclScope - Retrieves the innermost scope, starting 1200/// from S, where a non-field would be declared. This routine copes 1201/// with the difference between C and C++ scoping rules in structs and 1202/// unions. For example, the following code is well-formed in C but 1203/// ill-formed in C++: 1204/// @code 1205/// struct S6 { 1206/// enum { BAR } e; 1207/// }; 1208/// 1209/// void test_S6() { 1210/// struct S6 a; 1211/// a.e = BAR; 1212/// } 1213/// @endcode 1214/// For the declaration of BAR, this routine will return a different 1215/// scope. The scope S will be the scope of the unnamed enumeration 1216/// within S6. In C++, this routine will return the scope associated 1217/// with S6, because the enumeration's scope is a transparent 1218/// context but structures can contain non-field names. In C, this 1219/// routine will return the translation unit scope, since the 1220/// enumeration's scope is a transparent context and structures cannot 1221/// contain non-field names. 1222Scope *Sema::getNonFieldDeclScope(Scope *S) { 1223 while (((S->getFlags() & Scope::DeclScope) == 0) || 1224 (S->getEntity() && 1225 ((DeclContext *)S->getEntity())->isTransparentContext()) || 1226 (S->isClassScope() && !getLangOptions().CPlusPlus)) 1227 S = S->getParent(); 1228 return S; 1229} 1230 1231/// LazilyCreateBuiltin - The specified Builtin-ID was first used at 1232/// file scope. lazily create a decl for it. ForRedeclaration is true 1233/// if we're creating this built-in in anticipation of redeclaring the 1234/// built-in. 1235NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid, 1236 Scope *S, bool ForRedeclaration, 1237 SourceLocation Loc) { 1238 Builtin::ID BID = (Builtin::ID)bid; 1239 1240 ASTContext::GetBuiltinTypeError Error; 1241 QualType R = Context.GetBuiltinType(BID, Error); 1242 switch (Error) { 1243 case ASTContext::GE_None: 1244 // Okay 1245 break; 1246 1247 case ASTContext::GE_Missing_stdio: 1248 if (ForRedeclaration) 1249 Diag(Loc, diag::warn_implicit_decl_requires_stdio) 1250 << Context.BuiltinInfo.GetName(BID); 1251 return 0; 1252 1253 case ASTContext::GE_Missing_setjmp: 1254 if (ForRedeclaration) 1255 Diag(Loc, diag::warn_implicit_decl_requires_setjmp) 1256 << Context.BuiltinInfo.GetName(BID); 1257 return 0; 1258 } 1259 1260 if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) { 1261 Diag(Loc, diag::ext_implicit_lib_function_decl) 1262 << Context.BuiltinInfo.GetName(BID) 1263 << R; 1264 if (Context.BuiltinInfo.getHeaderName(BID) && 1265 Diags.getDiagnosticLevel(diag::ext_implicit_lib_function_decl, Loc) 1266 != DiagnosticsEngine::Ignored) 1267 Diag(Loc, diag::note_please_include_header) 1268 << Context.BuiltinInfo.getHeaderName(BID) 1269 << Context.BuiltinInfo.GetName(BID); 1270 } 1271 1272 FunctionDecl *New = FunctionDecl::Create(Context, 1273 Context.getTranslationUnitDecl(), 1274 Loc, Loc, II, R, /*TInfo=*/0, 1275 SC_Extern, 1276 SC_None, false, 1277 /*hasPrototype=*/true); 1278 New->setImplicit(); 1279 1280 // Create Decl objects for each parameter, adding them to the 1281 // FunctionDecl. 1282 if (const FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) { 1283 SmallVector<ParmVarDecl*, 16> Params; 1284 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) { 1285 ParmVarDecl *parm = 1286 ParmVarDecl::Create(Context, New, SourceLocation(), 1287 SourceLocation(), 0, 1288 FT->getArgType(i), /*TInfo=*/0, 1289 SC_None, SC_None, 0); 1290 parm->setScopeInfo(0, i); 1291 Params.push_back(parm); 1292 } 1293 New->setParams(Params); 1294 } 1295 1296 AddKnownFunctionAttributes(New); 1297 1298 // TUScope is the translation-unit scope to insert this function into. 1299 // FIXME: This is hideous. We need to teach PushOnScopeChains to 1300 // relate Scopes to DeclContexts, and probably eliminate CurContext 1301 // entirely, but we're not there yet. 1302 DeclContext *SavedContext = CurContext; 1303 CurContext = Context.getTranslationUnitDecl(); 1304 PushOnScopeChains(New, TUScope); 1305 CurContext = SavedContext; 1306 return New; 1307} 1308 1309/// MergeTypedefNameDecl - We just parsed a typedef 'New' which has the 1310/// same name and scope as a previous declaration 'Old'. Figure out 1311/// how to resolve this situation, merging decls or emitting 1312/// diagnostics as appropriate. If there was an error, set New to be invalid. 1313/// 1314void Sema::MergeTypedefNameDecl(TypedefNameDecl *New, LookupResult &OldDecls) { 1315 // If the new decl is known invalid already, don't bother doing any 1316 // merging checks. 1317 if (New->isInvalidDecl()) return; 1318 1319 // Allow multiple definitions for ObjC built-in typedefs. 1320 // FIXME: Verify the underlying types are equivalent! 1321 if (getLangOptions().ObjC1) { 1322 const IdentifierInfo *TypeID = New->getIdentifier(); 1323 switch (TypeID->getLength()) { 1324 default: break; 1325 case 2: 1326 if (!TypeID->isStr("id")) 1327 break; 1328 Context.setObjCIdRedefinitionType(New->getUnderlyingType()); 1329 // Install the built-in type for 'id', ignoring the current definition. 1330 New->setTypeForDecl(Context.getObjCIdType().getTypePtr()); 1331 return; 1332 case 5: 1333 if (!TypeID->isStr("Class")) 1334 break; 1335 Context.setObjCClassRedefinitionType(New->getUnderlyingType()); 1336 // Install the built-in type for 'Class', ignoring the current definition. 1337 New->setTypeForDecl(Context.getObjCClassType().getTypePtr()); 1338 return; 1339 case 3: 1340 if (!TypeID->isStr("SEL")) 1341 break; 1342 Context.setObjCSelRedefinitionType(New->getUnderlyingType()); 1343 // Install the built-in type for 'SEL', ignoring the current definition. 1344 New->setTypeForDecl(Context.getObjCSelType().getTypePtr()); 1345 return; 1346 } 1347 // Fall through - the typedef name was not a builtin type. 1348 } 1349 1350 // Verify the old decl was also a type. 1351 TypeDecl *Old = OldDecls.getAsSingle<TypeDecl>(); 1352 if (!Old) { 1353 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1354 << New->getDeclName(); 1355 1356 NamedDecl *OldD = OldDecls.getRepresentativeDecl(); 1357 if (OldD->getLocation().isValid()) 1358 Diag(OldD->getLocation(), diag::note_previous_definition); 1359 1360 return New->setInvalidDecl(); 1361 } 1362 1363 // If the old declaration is invalid, just give up here. 1364 if (Old->isInvalidDecl()) 1365 return New->setInvalidDecl(); 1366 1367 // Determine the "old" type we'll use for checking and diagnostics. 1368 QualType OldType; 1369 if (TypedefNameDecl *OldTypedef = dyn_cast<TypedefNameDecl>(Old)) 1370 OldType = OldTypedef->getUnderlyingType(); 1371 else 1372 OldType = Context.getTypeDeclType(Old); 1373 1374 // If the typedef types are not identical, reject them in all languages and 1375 // with any extensions enabled. 1376 1377 if (OldType != New->getUnderlyingType() && 1378 Context.getCanonicalType(OldType) != 1379 Context.getCanonicalType(New->getUnderlyingType())) { 1380 int Kind = 0; 1381 if (isa<TypeAliasDecl>(Old)) 1382 Kind = 1; 1383 Diag(New->getLocation(), diag::err_redefinition_different_typedef) 1384 << Kind << New->getUnderlyingType() << OldType; 1385 if (Old->getLocation().isValid()) 1386 Diag(Old->getLocation(), diag::note_previous_definition); 1387 return New->setInvalidDecl(); 1388 } 1389 1390 // The types match. Link up the redeclaration chain if the old 1391 // declaration was a typedef. 1392 // FIXME: this is a potential source of weirdness if the type 1393 // spellings don't match exactly. 1394 if (TypedefNameDecl *Typedef = dyn_cast<TypedefNameDecl>(Old)) 1395 New->setPreviousDeclaration(Typedef); 1396 1397 // __module_private__ is propagated to later declarations. 1398 if (Old->isModulePrivate()) 1399 New->setModulePrivate(); 1400 else if (New->isModulePrivate()) 1401 diagnoseModulePrivateRedeclaration(New, Old); 1402 1403 if (getLangOptions().MicrosoftExt) 1404 return; 1405 1406 if (getLangOptions().CPlusPlus) { 1407 // C++ [dcl.typedef]p2: 1408 // In a given non-class scope, a typedef specifier can be used to 1409 // redefine the name of any type declared in that scope to refer 1410 // to the type to which it already refers. 1411 if (!isa<CXXRecordDecl>(CurContext)) 1412 return; 1413 1414 // C++0x [dcl.typedef]p4: 1415 // In a given class scope, a typedef specifier can be used to redefine 1416 // any class-name declared in that scope that is not also a typedef-name 1417 // to refer to the type to which it already refers. 1418 // 1419 // This wording came in via DR424, which was a correction to the 1420 // wording in DR56, which accidentally banned code like: 1421 // 1422 // struct S { 1423 // typedef struct A { } A; 1424 // }; 1425 // 1426 // in the C++03 standard. We implement the C++0x semantics, which 1427 // allow the above but disallow 1428 // 1429 // struct S { 1430 // typedef int I; 1431 // typedef int I; 1432 // }; 1433 // 1434 // since that was the intent of DR56. 1435 if (!isa<TypedefNameDecl>(Old)) 1436 return; 1437 1438 Diag(New->getLocation(), diag::err_redefinition) 1439 << New->getDeclName(); 1440 Diag(Old->getLocation(), diag::note_previous_definition); 1441 return New->setInvalidDecl(); 1442 } 1443 1444 // If we have a redefinition of a typedef in C, emit a warning. This warning 1445 // is normally mapped to an error, but can be controlled with 1446 // -Wtypedef-redefinition. If either the original or the redefinition is 1447 // in a system header, don't emit this for compatibility with GCC. 1448 if (getDiagnostics().getSuppressSystemWarnings() && 1449 (Context.getSourceManager().isInSystemHeader(Old->getLocation()) || 1450 Context.getSourceManager().isInSystemHeader(New->getLocation()))) 1451 return; 1452 1453 Diag(New->getLocation(), diag::warn_redefinition_of_typedef) 1454 << New->getDeclName(); 1455 Diag(Old->getLocation(), diag::note_previous_definition); 1456 return; 1457} 1458 1459/// DeclhasAttr - returns true if decl Declaration already has the target 1460/// attribute. 1461static bool 1462DeclHasAttr(const Decl *D, const Attr *A) { 1463 const OwnershipAttr *OA = dyn_cast<OwnershipAttr>(A); 1464 const AnnotateAttr *Ann = dyn_cast<AnnotateAttr>(A); 1465 for (Decl::attr_iterator i = D->attr_begin(), e = D->attr_end(); i != e; ++i) 1466 if ((*i)->getKind() == A->getKind()) { 1467 if (Ann) { 1468 if (Ann->getAnnotation() == cast<AnnotateAttr>(*i)->getAnnotation()) 1469 return true; 1470 continue; 1471 } 1472 // FIXME: Don't hardcode this check 1473 if (OA && isa<OwnershipAttr>(*i)) 1474 return OA->getOwnKind() == cast<OwnershipAttr>(*i)->getOwnKind(); 1475 return true; 1476 } 1477 1478 return false; 1479} 1480 1481/// mergeDeclAttributes - Copy attributes from the Old decl to the New one. 1482static void mergeDeclAttributes(Decl *newDecl, const Decl *oldDecl, 1483 ASTContext &C, bool mergeDeprecation = true) { 1484 if (!oldDecl->hasAttrs()) 1485 return; 1486 1487 bool foundAny = newDecl->hasAttrs(); 1488 1489 // Ensure that any moving of objects within the allocated map is done before 1490 // we process them. 1491 if (!foundAny) newDecl->setAttrs(AttrVec()); 1492 1493 for (specific_attr_iterator<InheritableAttr> 1494 i = oldDecl->specific_attr_begin<InheritableAttr>(), 1495 e = oldDecl->specific_attr_end<InheritableAttr>(); i != e; ++i) { 1496 // Ignore deprecated/unavailable/availability attributes if requested. 1497 if (!mergeDeprecation && 1498 (isa<DeprecatedAttr>(*i) || 1499 isa<UnavailableAttr>(*i) || 1500 isa<AvailabilityAttr>(*i))) 1501 continue; 1502 1503 if (!DeclHasAttr(newDecl, *i)) { 1504 InheritableAttr *newAttr = cast<InheritableAttr>((*i)->clone(C)); 1505 newAttr->setInherited(true); 1506 newDecl->addAttr(newAttr); 1507 foundAny = true; 1508 } 1509 } 1510 1511 if (!foundAny) newDecl->dropAttrs(); 1512} 1513 1514/// mergeParamDeclAttributes - Copy attributes from the old parameter 1515/// to the new one. 1516static void mergeParamDeclAttributes(ParmVarDecl *newDecl, 1517 const ParmVarDecl *oldDecl, 1518 ASTContext &C) { 1519 if (!oldDecl->hasAttrs()) 1520 return; 1521 1522 bool foundAny = newDecl->hasAttrs(); 1523 1524 // Ensure that any moving of objects within the allocated map is 1525 // done before we process them. 1526 if (!foundAny) newDecl->setAttrs(AttrVec()); 1527 1528 for (specific_attr_iterator<InheritableParamAttr> 1529 i = oldDecl->specific_attr_begin<InheritableParamAttr>(), 1530 e = oldDecl->specific_attr_end<InheritableParamAttr>(); i != e; ++i) { 1531 if (!DeclHasAttr(newDecl, *i)) { 1532 InheritableAttr *newAttr = cast<InheritableParamAttr>((*i)->clone(C)); 1533 newAttr->setInherited(true); 1534 newDecl->addAttr(newAttr); 1535 foundAny = true; 1536 } 1537 } 1538 1539 if (!foundAny) newDecl->dropAttrs(); 1540} 1541 1542namespace { 1543 1544/// Used in MergeFunctionDecl to keep track of function parameters in 1545/// C. 1546struct GNUCompatibleParamWarning { 1547 ParmVarDecl *OldParm; 1548 ParmVarDecl *NewParm; 1549 QualType PromotedType; 1550}; 1551 1552} 1553 1554/// getSpecialMember - get the special member enum for a method. 1555Sema::CXXSpecialMember Sema::getSpecialMember(const CXXMethodDecl *MD) { 1556 if (const CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(MD)) { 1557 if (Ctor->isDefaultConstructor()) 1558 return Sema::CXXDefaultConstructor; 1559 1560 if (Ctor->isCopyConstructor()) 1561 return Sema::CXXCopyConstructor; 1562 1563 if (Ctor->isMoveConstructor()) 1564 return Sema::CXXMoveConstructor; 1565 } else if (isa<CXXDestructorDecl>(MD)) { 1566 return Sema::CXXDestructor; 1567 } else if (MD->isCopyAssignmentOperator()) { 1568 return Sema::CXXCopyAssignment; 1569 } else if (MD->isMoveAssignmentOperator()) { 1570 return Sema::CXXMoveAssignment; 1571 } 1572 1573 return Sema::CXXInvalid; 1574} 1575 1576/// canRedefineFunction - checks if a function can be redefined. Currently, 1577/// only extern inline functions can be redefined, and even then only in 1578/// GNU89 mode. 1579static bool canRedefineFunction(const FunctionDecl *FD, 1580 const LangOptions& LangOpts) { 1581 return ((FD->hasAttr<GNUInlineAttr>() || LangOpts.GNUInline) && 1582 !LangOpts.CPlusPlus && 1583 FD->isInlineSpecified() && 1584 FD->getStorageClass() == SC_Extern); 1585} 1586 1587/// MergeFunctionDecl - We just parsed a function 'New' from 1588/// declarator D which has the same name and scope as a previous 1589/// declaration 'Old'. Figure out how to resolve this situation, 1590/// merging decls or emitting diagnostics as appropriate. 1591/// 1592/// In C++, New and Old must be declarations that are not 1593/// overloaded. Use IsOverload to determine whether New and Old are 1594/// overloaded, and to select the Old declaration that New should be 1595/// merged with. 1596/// 1597/// Returns true if there was an error, false otherwise. 1598bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD) { 1599 // Verify the old decl was also a function. 1600 FunctionDecl *Old = 0; 1601 if (FunctionTemplateDecl *OldFunctionTemplate 1602 = dyn_cast<FunctionTemplateDecl>(OldD)) 1603 Old = OldFunctionTemplate->getTemplatedDecl(); 1604 else 1605 Old = dyn_cast<FunctionDecl>(OldD); 1606 if (!Old) { 1607 if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(OldD)) { 1608 Diag(New->getLocation(), diag::err_using_decl_conflict_reverse); 1609 Diag(Shadow->getTargetDecl()->getLocation(), 1610 diag::note_using_decl_target); 1611 Diag(Shadow->getUsingDecl()->getLocation(), 1612 diag::note_using_decl) << 0; 1613 return true; 1614 } 1615 1616 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1617 << New->getDeclName(); 1618 Diag(OldD->getLocation(), diag::note_previous_definition); 1619 return true; 1620 } 1621 1622 // Determine whether the previous declaration was a definition, 1623 // implicit declaration, or a declaration. 1624 diag::kind PrevDiag; 1625 if (Old->isThisDeclarationADefinition()) 1626 PrevDiag = diag::note_previous_definition; 1627 else if (Old->isImplicit()) 1628 PrevDiag = diag::note_previous_implicit_declaration; 1629 else 1630 PrevDiag = diag::note_previous_declaration; 1631 1632 QualType OldQType = Context.getCanonicalType(Old->getType()); 1633 QualType NewQType = Context.getCanonicalType(New->getType()); 1634 1635 // Don't complain about this if we're in GNU89 mode and the old function 1636 // is an extern inline function. 1637 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) && 1638 New->getStorageClass() == SC_Static && 1639 Old->getStorageClass() != SC_Static && 1640 !canRedefineFunction(Old, getLangOptions())) { 1641 if (getLangOptions().MicrosoftExt) { 1642 Diag(New->getLocation(), diag::warn_static_non_static) << New; 1643 Diag(Old->getLocation(), PrevDiag); 1644 } else { 1645 Diag(New->getLocation(), diag::err_static_non_static) << New; 1646 Diag(Old->getLocation(), PrevDiag); 1647 return true; 1648 } 1649 } 1650 1651 // If a function is first declared with a calling convention, but is 1652 // later declared or defined without one, the second decl assumes the 1653 // calling convention of the first. 1654 // 1655 // For the new decl, we have to look at the NON-canonical type to tell the 1656 // difference between a function that really doesn't have a calling 1657 // convention and one that is declared cdecl. That's because in 1658 // canonicalization (see ASTContext.cpp), cdecl is canonicalized away 1659 // because it is the default calling convention. 1660 // 1661 // Note also that we DO NOT return at this point, because we still have 1662 // other tests to run. 1663 const FunctionType *OldType = cast<FunctionType>(OldQType); 1664 const FunctionType *NewType = New->getType()->getAs<FunctionType>(); 1665 FunctionType::ExtInfo OldTypeInfo = OldType->getExtInfo(); 1666 FunctionType::ExtInfo NewTypeInfo = NewType->getExtInfo(); 1667 bool RequiresAdjustment = false; 1668 if (OldTypeInfo.getCC() != CC_Default && 1669 NewTypeInfo.getCC() == CC_Default) { 1670 NewTypeInfo = NewTypeInfo.withCallingConv(OldTypeInfo.getCC()); 1671 RequiresAdjustment = true; 1672 } else if (!Context.isSameCallConv(OldTypeInfo.getCC(), 1673 NewTypeInfo.getCC())) { 1674 // Calling conventions really aren't compatible, so complain. 1675 Diag(New->getLocation(), diag::err_cconv_change) 1676 << FunctionType::getNameForCallConv(NewTypeInfo.getCC()) 1677 << (OldTypeInfo.getCC() == CC_Default) 1678 << (OldTypeInfo.getCC() == CC_Default ? "" : 1679 FunctionType::getNameForCallConv(OldTypeInfo.getCC())); 1680 Diag(Old->getLocation(), diag::note_previous_declaration); 1681 return true; 1682 } 1683 1684 // FIXME: diagnose the other way around? 1685 if (OldTypeInfo.getNoReturn() && !NewTypeInfo.getNoReturn()) { 1686 NewTypeInfo = NewTypeInfo.withNoReturn(true); 1687 RequiresAdjustment = true; 1688 } 1689 1690 // Merge regparm attribute. 1691 if (OldTypeInfo.getHasRegParm() != NewTypeInfo.getHasRegParm() || 1692 OldTypeInfo.getRegParm() != NewTypeInfo.getRegParm()) { 1693 if (NewTypeInfo.getHasRegParm()) { 1694 Diag(New->getLocation(), diag::err_regparm_mismatch) 1695 << NewType->getRegParmType() 1696 << OldType->getRegParmType(); 1697 Diag(Old->getLocation(), diag::note_previous_declaration); 1698 return true; 1699 } 1700 1701 NewTypeInfo = NewTypeInfo.withRegParm(OldTypeInfo.getRegParm()); 1702 RequiresAdjustment = true; 1703 } 1704 1705 if (RequiresAdjustment) { 1706 NewType = Context.adjustFunctionType(NewType, NewTypeInfo); 1707 New->setType(QualType(NewType, 0)); 1708 NewQType = Context.getCanonicalType(New->getType()); 1709 } 1710 1711 if (getLangOptions().CPlusPlus) { 1712 // (C++98 13.1p2): 1713 // Certain function declarations cannot be overloaded: 1714 // -- Function declarations that differ only in the return type 1715 // cannot be overloaded. 1716 QualType OldReturnType = OldType->getResultType(); 1717 QualType NewReturnType = cast<FunctionType>(NewQType)->getResultType(); 1718 QualType ResQT; 1719 if (OldReturnType != NewReturnType) { 1720 if (NewReturnType->isObjCObjectPointerType() 1721 && OldReturnType->isObjCObjectPointerType()) 1722 ResQT = Context.mergeObjCGCQualifiers(NewQType, OldQType); 1723 if (ResQT.isNull()) { 1724 if (New->isCXXClassMember() && New->isOutOfLine()) 1725 Diag(New->getLocation(), 1726 diag::err_member_def_does_not_match_ret_type) << New; 1727 else 1728 Diag(New->getLocation(), diag::err_ovl_diff_return_type); 1729 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1730 return true; 1731 } 1732 else 1733 NewQType = ResQT; 1734 } 1735 1736 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 1737 CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 1738 if (OldMethod && NewMethod) { 1739 // Preserve triviality. 1740 NewMethod->setTrivial(OldMethod->isTrivial()); 1741 1742 // MSVC allows explicit template specialization at class scope: 1743 // 2 CXMethodDecls referring to the same function will be injected. 1744 // We don't want a redeclartion error. 1745 bool IsClassScopeExplicitSpecialization = 1746 OldMethod->isFunctionTemplateSpecialization() && 1747 NewMethod->isFunctionTemplateSpecialization(); 1748 bool isFriend = NewMethod->getFriendObjectKind(); 1749 1750 if (!isFriend && NewMethod->getLexicalDeclContext()->isRecord() && 1751 !IsClassScopeExplicitSpecialization) { 1752 // -- Member function declarations with the same name and the 1753 // same parameter types cannot be overloaded if any of them 1754 // is a static member function declaration. 1755 if (OldMethod->isStatic() || NewMethod->isStatic()) { 1756 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 1757 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1758 return true; 1759 } 1760 1761 // C++ [class.mem]p1: 1762 // [...] A member shall not be declared twice in the 1763 // member-specification, except that a nested class or member 1764 // class template can be declared and then later defined. 1765 unsigned NewDiag; 1766 if (isa<CXXConstructorDecl>(OldMethod)) 1767 NewDiag = diag::err_constructor_redeclared; 1768 else if (isa<CXXDestructorDecl>(NewMethod)) 1769 NewDiag = diag::err_destructor_redeclared; 1770 else if (isa<CXXConversionDecl>(NewMethod)) 1771 NewDiag = diag::err_conv_function_redeclared; 1772 else 1773 NewDiag = diag::err_member_redeclared; 1774 1775 Diag(New->getLocation(), NewDiag); 1776 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1777 1778 // Complain if this is an explicit declaration of a special 1779 // member that was initially declared implicitly. 1780 // 1781 // As an exception, it's okay to befriend such methods in order 1782 // to permit the implicit constructor/destructor/operator calls. 1783 } else if (OldMethod->isImplicit()) { 1784 if (isFriend) { 1785 NewMethod->setImplicit(); 1786 } else { 1787 Diag(NewMethod->getLocation(), 1788 diag::err_definition_of_implicitly_declared_member) 1789 << New << getSpecialMember(OldMethod); 1790 return true; 1791 } 1792 } else if (OldMethod->isExplicitlyDefaulted()) { 1793 Diag(NewMethod->getLocation(), 1794 diag::err_definition_of_explicitly_defaulted_member) 1795 << getSpecialMember(OldMethod); 1796 return true; 1797 } 1798 } 1799 1800 // (C++98 8.3.5p3): 1801 // All declarations for a function shall agree exactly in both the 1802 // return type and the parameter-type-list. 1803 // We also want to respect all the extended bits except noreturn. 1804 1805 // noreturn should now match unless the old type info didn't have it. 1806 QualType OldQTypeForComparison = OldQType; 1807 if (!OldTypeInfo.getNoReturn() && NewTypeInfo.getNoReturn()) { 1808 assert(OldQType == QualType(OldType, 0)); 1809 const FunctionType *OldTypeForComparison 1810 = Context.adjustFunctionType(OldType, OldTypeInfo.withNoReturn(true)); 1811 OldQTypeForComparison = QualType(OldTypeForComparison, 0); 1812 assert(OldQTypeForComparison.isCanonical()); 1813 } 1814 1815 if (OldQTypeForComparison == NewQType) 1816 return MergeCompatibleFunctionDecls(New, Old); 1817 1818 // Fall through for conflicting redeclarations and redefinitions. 1819 } 1820 1821 // C: Function types need to be compatible, not identical. This handles 1822 // duplicate function decls like "void f(int); void f(enum X);" properly. 1823 if (!getLangOptions().CPlusPlus && 1824 Context.typesAreCompatible(OldQType, NewQType)) { 1825 const FunctionType *OldFuncType = OldQType->getAs<FunctionType>(); 1826 const FunctionType *NewFuncType = NewQType->getAs<FunctionType>(); 1827 const FunctionProtoType *OldProto = 0; 1828 if (isa<FunctionNoProtoType>(NewFuncType) && 1829 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) { 1830 // The old declaration provided a function prototype, but the 1831 // new declaration does not. Merge in the prototype. 1832 assert(!OldProto->hasExceptionSpec() && "Exception spec in C"); 1833 SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(), 1834 OldProto->arg_type_end()); 1835 NewQType = Context.getFunctionType(NewFuncType->getResultType(), 1836 ParamTypes.data(), ParamTypes.size(), 1837 OldProto->getExtProtoInfo()); 1838 New->setType(NewQType); 1839 New->setHasInheritedPrototype(); 1840 1841 // Synthesize a parameter for each argument type. 1842 SmallVector<ParmVarDecl*, 16> Params; 1843 for (FunctionProtoType::arg_type_iterator 1844 ParamType = OldProto->arg_type_begin(), 1845 ParamEnd = OldProto->arg_type_end(); 1846 ParamType != ParamEnd; ++ParamType) { 1847 ParmVarDecl *Param = ParmVarDecl::Create(Context, New, 1848 SourceLocation(), 1849 SourceLocation(), 0, 1850 *ParamType, /*TInfo=*/0, 1851 SC_None, SC_None, 1852 0); 1853 Param->setScopeInfo(0, Params.size()); 1854 Param->setImplicit(); 1855 Params.push_back(Param); 1856 } 1857 1858 New->setParams(Params); 1859 } 1860 1861 return MergeCompatibleFunctionDecls(New, Old); 1862 } 1863 1864 // GNU C permits a K&R definition to follow a prototype declaration 1865 // if the declared types of the parameters in the K&R definition 1866 // match the types in the prototype declaration, even when the 1867 // promoted types of the parameters from the K&R definition differ 1868 // from the types in the prototype. GCC then keeps the types from 1869 // the prototype. 1870 // 1871 // If a variadic prototype is followed by a non-variadic K&R definition, 1872 // the K&R definition becomes variadic. This is sort of an edge case, but 1873 // it's legal per the standard depending on how you read C99 6.7.5.3p15 and 1874 // C99 6.9.1p8. 1875 if (!getLangOptions().CPlusPlus && 1876 Old->hasPrototype() && !New->hasPrototype() && 1877 New->getType()->getAs<FunctionProtoType>() && 1878 Old->getNumParams() == New->getNumParams()) { 1879 SmallVector<QualType, 16> ArgTypes; 1880 SmallVector<GNUCompatibleParamWarning, 16> Warnings; 1881 const FunctionProtoType *OldProto 1882 = Old->getType()->getAs<FunctionProtoType>(); 1883 const FunctionProtoType *NewProto 1884 = New->getType()->getAs<FunctionProtoType>(); 1885 1886 // Determine whether this is the GNU C extension. 1887 QualType MergedReturn = Context.mergeTypes(OldProto->getResultType(), 1888 NewProto->getResultType()); 1889 bool LooseCompatible = !MergedReturn.isNull(); 1890 for (unsigned Idx = 0, End = Old->getNumParams(); 1891 LooseCompatible && Idx != End; ++Idx) { 1892 ParmVarDecl *OldParm = Old->getParamDecl(Idx); 1893 ParmVarDecl *NewParm = New->getParamDecl(Idx); 1894 if (Context.typesAreCompatible(OldParm->getType(), 1895 NewProto->getArgType(Idx))) { 1896 ArgTypes.push_back(NewParm->getType()); 1897 } else if (Context.typesAreCompatible(OldParm->getType(), 1898 NewParm->getType(), 1899 /*CompareUnqualified=*/true)) { 1900 GNUCompatibleParamWarning Warn 1901 = { OldParm, NewParm, NewProto->getArgType(Idx) }; 1902 Warnings.push_back(Warn); 1903 ArgTypes.push_back(NewParm->getType()); 1904 } else 1905 LooseCompatible = false; 1906 } 1907 1908 if (LooseCompatible) { 1909 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) { 1910 Diag(Warnings[Warn].NewParm->getLocation(), 1911 diag::ext_param_promoted_not_compatible_with_prototype) 1912 << Warnings[Warn].PromotedType 1913 << Warnings[Warn].OldParm->getType(); 1914 if (Warnings[Warn].OldParm->getLocation().isValid()) 1915 Diag(Warnings[Warn].OldParm->getLocation(), 1916 diag::note_previous_declaration); 1917 } 1918 1919 New->setType(Context.getFunctionType(MergedReturn, &ArgTypes[0], 1920 ArgTypes.size(), 1921 OldProto->getExtProtoInfo())); 1922 return MergeCompatibleFunctionDecls(New, Old); 1923 } 1924 1925 // Fall through to diagnose conflicting types. 1926 } 1927 1928 // A function that has already been declared has been redeclared or defined 1929 // with a different type- show appropriate diagnostic 1930 if (unsigned BuiltinID = Old->getBuiltinID()) { 1931 // The user has declared a builtin function with an incompatible 1932 // signature. 1933 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 1934 // The function the user is redeclaring is a library-defined 1935 // function like 'malloc' or 'printf'. Warn about the 1936 // redeclaration, then pretend that we don't know about this 1937 // library built-in. 1938 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; 1939 Diag(Old->getLocation(), diag::note_previous_builtin_declaration) 1940 << Old << Old->getType(); 1941 New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin); 1942 Old->setInvalidDecl(); 1943 return false; 1944 } 1945 1946 PrevDiag = diag::note_previous_builtin_declaration; 1947 } 1948 1949 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 1950 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1951 return true; 1952} 1953 1954/// \brief Completes the merge of two function declarations that are 1955/// known to be compatible. 1956/// 1957/// This routine handles the merging of attributes and other 1958/// properties of function declarations form the old declaration to 1959/// the new declaration, once we know that New is in fact a 1960/// redeclaration of Old. 1961/// 1962/// \returns false 1963bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old) { 1964 // Merge the attributes 1965 mergeDeclAttributes(New, Old, Context); 1966 1967 // Merge the storage class. 1968 if (Old->getStorageClass() != SC_Extern && 1969 Old->getStorageClass() != SC_None) 1970 New->setStorageClass(Old->getStorageClass()); 1971 1972 // Merge "pure" flag. 1973 if (Old->isPure()) 1974 New->setPure(); 1975 1976 // __module_private__ is propagated to later declarations. 1977 if (Old->isModulePrivate()) 1978 New->setModulePrivate(); 1979 else if (New->isModulePrivate()) 1980 diagnoseModulePrivateRedeclaration(New, Old); 1981 1982 // Merge attributes from the parameters. These can mismatch with K&R 1983 // declarations. 1984 if (New->getNumParams() == Old->getNumParams()) 1985 for (unsigned i = 0, e = New->getNumParams(); i != e; ++i) 1986 mergeParamDeclAttributes(New->getParamDecl(i), Old->getParamDecl(i), 1987 Context); 1988 1989 if (getLangOptions().CPlusPlus) 1990 return MergeCXXFunctionDecl(New, Old); 1991 1992 return false; 1993} 1994 1995 1996void Sema::mergeObjCMethodDecls(ObjCMethodDecl *newMethod, 1997 const ObjCMethodDecl *oldMethod) { 1998 // We don't want to merge unavailable and deprecated attributes 1999 // except from interface to implementation. 2000 bool mergeDeprecation = isa<ObjCImplDecl>(newMethod->getDeclContext()); 2001 2002 // Merge the attributes. 2003 mergeDeclAttributes(newMethod, oldMethod, Context, mergeDeprecation); 2004 2005 // Merge attributes from the parameters. 2006 for (ObjCMethodDecl::param_iterator oi = oldMethod->param_begin(), 2007 ni = newMethod->param_begin(), ne = newMethod->param_end(); 2008 ni != ne; ++ni, ++oi) 2009 mergeParamDeclAttributes(*ni, *oi, Context); 2010 2011 CheckObjCMethodOverride(newMethod, oldMethod, true); 2012} 2013 2014/// MergeVarDeclTypes - We parsed a variable 'New' which has the same name and 2015/// scope as a previous declaration 'Old'. Figure out how to merge their types, 2016/// emitting diagnostics as appropriate. 2017/// 2018/// Declarations using the auto type specifier (C++ [decl.spec.auto]) call back 2019/// to here in AddInitializerToDecl and AddCXXDirectInitializerToDecl. We can't 2020/// check them before the initializer is attached. 2021/// 2022void Sema::MergeVarDeclTypes(VarDecl *New, VarDecl *Old) { 2023 if (New->isInvalidDecl() || Old->isInvalidDecl()) 2024 return; 2025 2026 QualType MergedT; 2027 if (getLangOptions().CPlusPlus) { 2028 AutoType *AT = New->getType()->getContainedAutoType(); 2029 if (AT && !AT->isDeduced()) { 2030 // We don't know what the new type is until the initializer is attached. 2031 return; 2032 } else if (Context.hasSameType(New->getType(), Old->getType())) { 2033 // These could still be something that needs exception specs checked. 2034 return MergeVarDeclExceptionSpecs(New, Old); 2035 } 2036 // C++ [basic.link]p10: 2037 // [...] the types specified by all declarations referring to a given 2038 // object or function shall be identical, except that declarations for an 2039 // array object can specify array types that differ by the presence or 2040 // absence of a major array bound (8.3.4). 2041 else if (Old->getType()->isIncompleteArrayType() && 2042 New->getType()->isArrayType()) { 2043 CanQual<ArrayType> OldArray 2044 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 2045 CanQual<ArrayType> NewArray 2046 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 2047 if (OldArray->getElementType() == NewArray->getElementType()) 2048 MergedT = New->getType(); 2049 } else if (Old->getType()->isArrayType() && 2050 New->getType()->isIncompleteArrayType()) { 2051 CanQual<ArrayType> OldArray 2052 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 2053 CanQual<ArrayType> NewArray 2054 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 2055 if (OldArray->getElementType() == NewArray->getElementType()) 2056 MergedT = Old->getType(); 2057 } else if (New->getType()->isObjCObjectPointerType() 2058 && Old->getType()->isObjCObjectPointerType()) { 2059 MergedT = Context.mergeObjCGCQualifiers(New->getType(), 2060 Old->getType()); 2061 } 2062 } else { 2063 MergedT = Context.mergeTypes(New->getType(), Old->getType()); 2064 } 2065 if (MergedT.isNull()) { 2066 Diag(New->getLocation(), diag::err_redefinition_different_type) 2067 << New->getDeclName(); 2068 Diag(Old->getLocation(), diag::note_previous_definition); 2069 return New->setInvalidDecl(); 2070 } 2071 New->setType(MergedT); 2072} 2073 2074/// MergeVarDecl - We just parsed a variable 'New' which has the same name 2075/// and scope as a previous declaration 'Old'. Figure out how to resolve this 2076/// situation, merging decls or emitting diagnostics as appropriate. 2077/// 2078/// Tentative definition rules (C99 6.9.2p2) are checked by 2079/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 2080/// definitions here, since the initializer hasn't been attached. 2081/// 2082void Sema::MergeVarDecl(VarDecl *New, LookupResult &Previous) { 2083 // If the new decl is already invalid, don't do any other checking. 2084 if (New->isInvalidDecl()) 2085 return; 2086 2087 // Verify the old decl was also a variable. 2088 VarDecl *Old = 0; 2089 if (!Previous.isSingleResult() || 2090 !(Old = dyn_cast<VarDecl>(Previous.getFoundDecl()))) { 2091 Diag(New->getLocation(), diag::err_redefinition_different_kind) 2092 << New->getDeclName(); 2093 Diag(Previous.getRepresentativeDecl()->getLocation(), 2094 diag::note_previous_definition); 2095 return New->setInvalidDecl(); 2096 } 2097 2098 // C++ [class.mem]p1: 2099 // A member shall not be declared twice in the member-specification [...] 2100 // 2101 // Here, we need only consider static data members. 2102 if (Old->isStaticDataMember() && !New->isOutOfLine()) { 2103 Diag(New->getLocation(), diag::err_duplicate_member) 2104 << New->getIdentifier(); 2105 Diag(Old->getLocation(), diag::note_previous_declaration); 2106 New->setInvalidDecl(); 2107 } 2108 2109 mergeDeclAttributes(New, Old, Context); 2110 // Warn if an already-declared variable is made a weak_import in a subsequent declaration 2111 if (New->getAttr<WeakImportAttr>() && 2112 Old->getStorageClass() == SC_None && 2113 !Old->getAttr<WeakImportAttr>()) { 2114 Diag(New->getLocation(), diag::warn_weak_import) << New->getDeclName(); 2115 Diag(Old->getLocation(), diag::note_previous_definition); 2116 // Remove weak_import attribute on new declaration. 2117 New->dropAttr<WeakImportAttr>(); 2118 } 2119 2120 // Merge the types. 2121 MergeVarDeclTypes(New, Old); 2122 if (New->isInvalidDecl()) 2123 return; 2124 2125 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 2126 if (New->getStorageClass() == SC_Static && 2127 (Old->getStorageClass() == SC_None || Old->hasExternalStorage())) { 2128 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 2129 Diag(Old->getLocation(), diag::note_previous_definition); 2130 return New->setInvalidDecl(); 2131 } 2132 // C99 6.2.2p4: 2133 // For an identifier declared with the storage-class specifier 2134 // extern in a scope in which a prior declaration of that 2135 // identifier is visible,23) if the prior declaration specifies 2136 // internal or external linkage, the linkage of the identifier at 2137 // the later declaration is the same as the linkage specified at 2138 // the prior declaration. If no prior declaration is visible, or 2139 // if the prior declaration specifies no linkage, then the 2140 // identifier has external linkage. 2141 if (New->hasExternalStorage() && Old->hasLinkage()) 2142 /* Okay */; 2143 else if (New->getStorageClass() != SC_Static && 2144 Old->getStorageClass() == SC_Static) { 2145 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 2146 Diag(Old->getLocation(), diag::note_previous_definition); 2147 return New->setInvalidDecl(); 2148 } 2149 2150 // Check if extern is followed by non-extern and vice-versa. 2151 if (New->hasExternalStorage() && 2152 !Old->hasLinkage() && Old->isLocalVarDecl()) { 2153 Diag(New->getLocation(), diag::err_extern_non_extern) << New->getDeclName(); 2154 Diag(Old->getLocation(), diag::note_previous_definition); 2155 return New->setInvalidDecl(); 2156 } 2157 if (Old->hasExternalStorage() && 2158 !New->hasLinkage() && New->isLocalVarDecl()) { 2159 Diag(New->getLocation(), diag::err_non_extern_extern) << New->getDeclName(); 2160 Diag(Old->getLocation(), diag::note_previous_definition); 2161 return New->setInvalidDecl(); 2162 } 2163 2164 // __module_private__ is propagated to later declarations. 2165 if (Old->isModulePrivate()) 2166 New->setModulePrivate(); 2167 else if (New->isModulePrivate()) 2168 diagnoseModulePrivateRedeclaration(New, Old); 2169 2170 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 2171 2172 // FIXME: The test for external storage here seems wrong? We still 2173 // need to check for mismatches. 2174 if (!New->hasExternalStorage() && !New->isFileVarDecl() && 2175 // Don't complain about out-of-line definitions of static members. 2176 !(Old->getLexicalDeclContext()->isRecord() && 2177 !New->getLexicalDeclContext()->isRecord())) { 2178 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 2179 Diag(Old->getLocation(), diag::note_previous_definition); 2180 return New->setInvalidDecl(); 2181 } 2182 2183 if (New->isThreadSpecified() && !Old->isThreadSpecified()) { 2184 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName(); 2185 Diag(Old->getLocation(), diag::note_previous_definition); 2186 } else if (!New->isThreadSpecified() && Old->isThreadSpecified()) { 2187 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName(); 2188 Diag(Old->getLocation(), diag::note_previous_definition); 2189 } 2190 2191 // C++ doesn't have tentative definitions, so go right ahead and check here. 2192 const VarDecl *Def; 2193 if (getLangOptions().CPlusPlus && 2194 New->isThisDeclarationADefinition() == VarDecl::Definition && 2195 (Def = Old->getDefinition())) { 2196 Diag(New->getLocation(), diag::err_redefinition) 2197 << New->getDeclName(); 2198 Diag(Def->getLocation(), diag::note_previous_definition); 2199 New->setInvalidDecl(); 2200 return; 2201 } 2202 // c99 6.2.2 P4. 2203 // For an identifier declared with the storage-class specifier extern in a 2204 // scope in which a prior declaration of that identifier is visible, if 2205 // the prior declaration specifies internal or external linkage, the linkage 2206 // of the identifier at the later declaration is the same as the linkage 2207 // specified at the prior declaration. 2208 // FIXME. revisit this code. 2209 if (New->hasExternalStorage() && 2210 Old->getLinkage() == InternalLinkage && 2211 New->getDeclContext() == Old->getDeclContext()) 2212 New->setStorageClass(Old->getStorageClass()); 2213 2214 // Keep a chain of previous declarations. 2215 New->setPreviousDeclaration(Old); 2216 2217 // Inherit access appropriately. 2218 New->setAccess(Old->getAccess()); 2219} 2220 2221/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2222/// no declarator (e.g. "struct foo;") is parsed. 2223Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2224 DeclSpec &DS) { 2225 return ParsedFreeStandingDeclSpec(S, AS, DS, 2226 MultiTemplateParamsArg(*this, 0, 0)); 2227} 2228 2229/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2230/// no declarator (e.g. "struct foo;") is parsed. It also accopts template 2231/// parameters to cope with template friend declarations. 2232Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2233 DeclSpec &DS, 2234 MultiTemplateParamsArg TemplateParams) { 2235 Decl *TagD = 0; 2236 TagDecl *Tag = 0; 2237 if (DS.getTypeSpecType() == DeclSpec::TST_class || 2238 DS.getTypeSpecType() == DeclSpec::TST_struct || 2239 DS.getTypeSpecType() == DeclSpec::TST_union || 2240 DS.getTypeSpecType() == DeclSpec::TST_enum) { 2241 TagD = DS.getRepAsDecl(); 2242 2243 if (!TagD) // We probably had an error 2244 return 0; 2245 2246 // Note that the above type specs guarantee that the 2247 // type rep is a Decl, whereas in many of the others 2248 // it's a Type. 2249 Tag = dyn_cast<TagDecl>(TagD); 2250 } 2251 2252 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 2253 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 2254 // or incomplete types shall not be restrict-qualified." 2255 if (TypeQuals & DeclSpec::TQ_restrict) 2256 Diag(DS.getRestrictSpecLoc(), 2257 diag::err_typecheck_invalid_restrict_not_pointer_noarg) 2258 << DS.getSourceRange(); 2259 } 2260 2261 if (DS.isConstexprSpecified()) { 2262 // C++0x [dcl.constexpr]p1: constexpr can only be applied to declarations 2263 // and definitions of functions and variables. 2264 if (Tag) 2265 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_tag) 2266 << (DS.getTypeSpecType() == DeclSpec::TST_class ? 0 : 2267 DS.getTypeSpecType() == DeclSpec::TST_struct ? 1 : 2268 DS.getTypeSpecType() == DeclSpec::TST_union ? 2 : 3); 2269 else 2270 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_no_declarators); 2271 // Don't emit warnings after this error. 2272 return TagD; 2273 } 2274 2275 if (DS.isFriendSpecified()) { 2276 // If we're dealing with a decl but not a TagDecl, assume that 2277 // whatever routines created it handled the friendship aspect. 2278 if (TagD && !Tag) 2279 return 0; 2280 return ActOnFriendTypeDecl(S, DS, TemplateParams); 2281 } 2282 2283 // Track whether we warned about the fact that there aren't any 2284 // declarators. 2285 bool emittedWarning = false; 2286 2287 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 2288 ProcessDeclAttributeList(S, Record, DS.getAttributes().getList()); 2289 2290 if (!Record->getDeclName() && Record->isDefinition() && 2291 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { 2292 if (getLangOptions().CPlusPlus || 2293 Record->getDeclContext()->isRecord()) 2294 return BuildAnonymousStructOrUnion(S, DS, AS, Record); 2295 2296 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 2297 << DS.getSourceRange(); 2298 emittedWarning = true; 2299 } 2300 } 2301 2302 // Check for Microsoft C extension: anonymous struct. 2303 if (getLangOptions().MicrosoftExt && !getLangOptions().CPlusPlus && 2304 CurContext->isRecord() && 2305 DS.getStorageClassSpec() == DeclSpec::SCS_unspecified) { 2306 // Handle 2 kinds of anonymous struct: 2307 // struct STRUCT; 2308 // and 2309 // STRUCT_TYPE; <- where STRUCT_TYPE is a typedef struct. 2310 RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag); 2311 if ((Record && Record->getDeclName() && !Record->isDefinition()) || 2312 (DS.getTypeSpecType() == DeclSpec::TST_typename && 2313 DS.getRepAsType().get()->isStructureType())) { 2314 Diag(DS.getSourceRange().getBegin(), diag::ext_ms_anonymous_struct) 2315 << DS.getSourceRange(); 2316 return BuildMicrosoftCAnonymousStruct(S, DS, Record); 2317 } 2318 } 2319 2320 if (getLangOptions().CPlusPlus && 2321 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) 2322 if (EnumDecl *Enum = dyn_cast_or_null<EnumDecl>(Tag)) 2323 if (Enum->enumerator_begin() == Enum->enumerator_end() && 2324 !Enum->getIdentifier() && !Enum->isInvalidDecl()) { 2325 Diag(Enum->getLocation(), diag::ext_no_declarators) 2326 << DS.getSourceRange(); 2327 emittedWarning = true; 2328 } 2329 2330 // Skip all the checks below if we have a type error. 2331 if (DS.getTypeSpecType() == DeclSpec::TST_error) return TagD; 2332 2333 if (!DS.isMissingDeclaratorOk()) { 2334 // Warn about typedefs of enums without names, since this is an 2335 // extension in both Microsoft and GNU. 2336 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 2337 Tag && isa<EnumDecl>(Tag)) { 2338 Diag(DS.getSourceRange().getBegin(), diag::ext_typedef_without_a_name) 2339 << DS.getSourceRange(); 2340 return Tag; 2341 } 2342 2343 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 2344 << DS.getSourceRange(); 2345 emittedWarning = true; 2346 } 2347 2348 // We're going to complain about a bunch of spurious specifiers; 2349 // only do this if we're declaring a tag, because otherwise we 2350 // should be getting diag::ext_no_declarators. 2351 if (emittedWarning || (TagD && TagD->isInvalidDecl())) 2352 return TagD; 2353 2354 // Note that a linkage-specification sets a storage class, but 2355 // 'extern "C" struct foo;' is actually valid and not theoretically 2356 // useless. 2357 if (DeclSpec::SCS scs = DS.getStorageClassSpec()) 2358 if (!DS.isExternInLinkageSpec()) 2359 Diag(DS.getStorageClassSpecLoc(), diag::warn_standalone_specifier) 2360 << DeclSpec::getSpecifierName(scs); 2361 2362 if (DS.isThreadSpecified()) 2363 Diag(DS.getThreadSpecLoc(), diag::warn_standalone_specifier) << "__thread"; 2364 if (DS.getTypeQualifiers()) { 2365 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2366 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "const"; 2367 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2368 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "volatile"; 2369 // Restrict is covered above. 2370 } 2371 if (DS.isInlineSpecified()) 2372 Diag(DS.getInlineSpecLoc(), diag::warn_standalone_specifier) << "inline"; 2373 if (DS.isVirtualSpecified()) 2374 Diag(DS.getVirtualSpecLoc(), diag::warn_standalone_specifier) << "virtual"; 2375 if (DS.isExplicitSpecified()) 2376 Diag(DS.getExplicitSpecLoc(), diag::warn_standalone_specifier) <<"explicit"; 2377 2378 if (DS.isModulePrivateSpecified() && 2379 Tag && Tag->getDeclContext()->isFunctionOrMethod()) 2380 Diag(DS.getModulePrivateSpecLoc(), diag::err_module_private_local_class) 2381 << Tag->getTagKind() 2382 << FixItHint::CreateRemoval(DS.getModulePrivateSpecLoc()); 2383 2384 // FIXME: Warn on useless attributes 2385 2386 return TagD; 2387} 2388 2389/// ActOnVlaStmt - This rouine if finds a vla expression in a decl spec. 2390/// builds a statement for it and returns it so it is evaluated. 2391StmtResult Sema::ActOnVlaStmt(const DeclSpec &DS) { 2392 StmtResult R; 2393 if (DS.getTypeSpecType() == DeclSpec::TST_typeofExpr) { 2394 Expr *Exp = DS.getRepAsExpr(); 2395 QualType Ty = Exp->getType(); 2396 if (Ty->isPointerType()) { 2397 do 2398 Ty = Ty->getAs<PointerType>()->getPointeeType(); 2399 while (Ty->isPointerType()); 2400 } 2401 if (Ty->isVariableArrayType()) { 2402 R = ActOnExprStmt(MakeFullExpr(Exp)); 2403 } 2404 } 2405 return R; 2406} 2407 2408/// We are trying to inject an anonymous member into the given scope; 2409/// check if there's an existing declaration that can't be overloaded. 2410/// 2411/// \return true if this is a forbidden redeclaration 2412static bool CheckAnonMemberRedeclaration(Sema &SemaRef, 2413 Scope *S, 2414 DeclContext *Owner, 2415 DeclarationName Name, 2416 SourceLocation NameLoc, 2417 unsigned diagnostic) { 2418 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupMemberName, 2419 Sema::ForRedeclaration); 2420 if (!SemaRef.LookupName(R, S)) return false; 2421 2422 if (R.getAsSingle<TagDecl>()) 2423 return false; 2424 2425 // Pick a representative declaration. 2426 NamedDecl *PrevDecl = R.getRepresentativeDecl()->getUnderlyingDecl(); 2427 assert(PrevDecl && "Expected a non-null Decl"); 2428 2429 if (!SemaRef.isDeclInScope(PrevDecl, Owner, S)) 2430 return false; 2431 2432 SemaRef.Diag(NameLoc, diagnostic) << Name; 2433 SemaRef.Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 2434 2435 return true; 2436} 2437 2438/// InjectAnonymousStructOrUnionMembers - Inject the members of the 2439/// anonymous struct or union AnonRecord into the owning context Owner 2440/// and scope S. This routine will be invoked just after we realize 2441/// that an unnamed union or struct is actually an anonymous union or 2442/// struct, e.g., 2443/// 2444/// @code 2445/// union { 2446/// int i; 2447/// float f; 2448/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 2449/// // f into the surrounding scope.x 2450/// @endcode 2451/// 2452/// This routine is recursive, injecting the names of nested anonymous 2453/// structs/unions into the owning context and scope as well. 2454static bool InjectAnonymousStructOrUnionMembers(Sema &SemaRef, Scope *S, 2455 DeclContext *Owner, 2456 RecordDecl *AnonRecord, 2457 AccessSpecifier AS, 2458 SmallVector<NamedDecl*, 2> &Chaining, 2459 bool MSAnonStruct) { 2460 unsigned diagKind 2461 = AnonRecord->isUnion() ? diag::err_anonymous_union_member_redecl 2462 : diag::err_anonymous_struct_member_redecl; 2463 2464 bool Invalid = false; 2465 2466 // Look every FieldDecl and IndirectFieldDecl with a name. 2467 for (RecordDecl::decl_iterator D = AnonRecord->decls_begin(), 2468 DEnd = AnonRecord->decls_end(); 2469 D != DEnd; ++D) { 2470 if ((isa<FieldDecl>(*D) || isa<IndirectFieldDecl>(*D)) && 2471 cast<NamedDecl>(*D)->getDeclName()) { 2472 ValueDecl *VD = cast<ValueDecl>(*D); 2473 if (CheckAnonMemberRedeclaration(SemaRef, S, Owner, VD->getDeclName(), 2474 VD->getLocation(), diagKind)) { 2475 // C++ [class.union]p2: 2476 // The names of the members of an anonymous union shall be 2477 // distinct from the names of any other entity in the 2478 // scope in which the anonymous union is declared. 2479 Invalid = true; 2480 } else { 2481 // C++ [class.union]p2: 2482 // For the purpose of name lookup, after the anonymous union 2483 // definition, the members of the anonymous union are 2484 // considered to have been defined in the scope in which the 2485 // anonymous union is declared. 2486 unsigned OldChainingSize = Chaining.size(); 2487 if (IndirectFieldDecl *IF = dyn_cast<IndirectFieldDecl>(VD)) 2488 for (IndirectFieldDecl::chain_iterator PI = IF->chain_begin(), 2489 PE = IF->chain_end(); PI != PE; ++PI) 2490 Chaining.push_back(*PI); 2491 else 2492 Chaining.push_back(VD); 2493 2494 assert(Chaining.size() >= 2); 2495 NamedDecl **NamedChain = 2496 new (SemaRef.Context)NamedDecl*[Chaining.size()]; 2497 for (unsigned i = 0; i < Chaining.size(); i++) 2498 NamedChain[i] = Chaining[i]; 2499 2500 IndirectFieldDecl* IndirectField = 2501 IndirectFieldDecl::Create(SemaRef.Context, Owner, VD->getLocation(), 2502 VD->getIdentifier(), VD->getType(), 2503 NamedChain, Chaining.size()); 2504 2505 IndirectField->setAccess(AS); 2506 IndirectField->setImplicit(); 2507 SemaRef.PushOnScopeChains(IndirectField, S); 2508 2509 // That includes picking up the appropriate access specifier. 2510 if (AS != AS_none) IndirectField->setAccess(AS); 2511 2512 Chaining.resize(OldChainingSize); 2513 } 2514 } 2515 } 2516 2517 return Invalid; 2518} 2519 2520/// StorageClassSpecToVarDeclStorageClass - Maps a DeclSpec::SCS to 2521/// a VarDecl::StorageClass. Any error reporting is up to the caller: 2522/// illegal input values are mapped to SC_None. 2523static StorageClass 2524StorageClassSpecToVarDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2525 switch (StorageClassSpec) { 2526 case DeclSpec::SCS_unspecified: return SC_None; 2527 case DeclSpec::SCS_extern: return SC_Extern; 2528 case DeclSpec::SCS_static: return SC_Static; 2529 case DeclSpec::SCS_auto: return SC_Auto; 2530 case DeclSpec::SCS_register: return SC_Register; 2531 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2532 // Illegal SCSs map to None: error reporting is up to the caller. 2533 case DeclSpec::SCS_mutable: // Fall through. 2534 case DeclSpec::SCS_typedef: return SC_None; 2535 } 2536 llvm_unreachable("unknown storage class specifier"); 2537} 2538 2539/// StorageClassSpecToFunctionDeclStorageClass - Maps a DeclSpec::SCS to 2540/// a StorageClass. Any error reporting is up to the caller: 2541/// illegal input values are mapped to SC_None. 2542static StorageClass 2543StorageClassSpecToFunctionDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2544 switch (StorageClassSpec) { 2545 case DeclSpec::SCS_unspecified: return SC_None; 2546 case DeclSpec::SCS_extern: return SC_Extern; 2547 case DeclSpec::SCS_static: return SC_Static; 2548 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2549 // Illegal SCSs map to None: error reporting is up to the caller. 2550 case DeclSpec::SCS_auto: // Fall through. 2551 case DeclSpec::SCS_mutable: // Fall through. 2552 case DeclSpec::SCS_register: // Fall through. 2553 case DeclSpec::SCS_typedef: return SC_None; 2554 } 2555 llvm_unreachable("unknown storage class specifier"); 2556} 2557 2558/// BuildAnonymousStructOrUnion - Handle the declaration of an 2559/// anonymous structure or union. Anonymous unions are a C++ feature 2560/// (C++ [class.union]) and a GNU C extension; anonymous structures 2561/// are a GNU C and GNU C++ extension. 2562Decl *Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 2563 AccessSpecifier AS, 2564 RecordDecl *Record) { 2565 DeclContext *Owner = Record->getDeclContext(); 2566 2567 // Diagnose whether this anonymous struct/union is an extension. 2568 if (Record->isUnion() && !getLangOptions().CPlusPlus) 2569 Diag(Record->getLocation(), diag::ext_anonymous_union); 2570 else if (!Record->isUnion()) 2571 Diag(Record->getLocation(), diag::ext_anonymous_struct); 2572 2573 // C and C++ require different kinds of checks for anonymous 2574 // structs/unions. 2575 bool Invalid = false; 2576 if (getLangOptions().CPlusPlus) { 2577 const char* PrevSpec = 0; 2578 unsigned DiagID; 2579 // C++ [class.union]p3: 2580 // Anonymous unions declared in a named namespace or in the 2581 // global namespace shall be declared static. 2582 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 2583 (isa<TranslationUnitDecl>(Owner) || 2584 (isa<NamespaceDecl>(Owner) && 2585 cast<NamespaceDecl>(Owner)->getDeclName()))) { 2586 Diag(Record->getLocation(), diag::err_anonymous_union_not_static); 2587 Invalid = true; 2588 2589 // Recover by adding 'static'. 2590 DS.SetStorageClassSpec(DeclSpec::SCS_static, SourceLocation(), 2591 PrevSpec, DiagID, getLangOptions()); 2592 } 2593 // C++ [class.union]p3: 2594 // A storage class is not allowed in a declaration of an 2595 // anonymous union in a class scope. 2596 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 2597 isa<RecordDecl>(Owner)) { 2598 Diag(DS.getStorageClassSpecLoc(), 2599 diag::err_anonymous_union_with_storage_spec); 2600 Invalid = true; 2601 2602 // Recover by removing the storage specifier. 2603 DS.SetStorageClassSpec(DeclSpec::SCS_unspecified, SourceLocation(), 2604 PrevSpec, DiagID, getLangOptions()); 2605 } 2606 2607 // Ignore const/volatile/restrict qualifiers. 2608 if (DS.getTypeQualifiers()) { 2609 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2610 Diag(DS.getConstSpecLoc(), diag::ext_anonymous_struct_union_qualified) 2611 << Record->isUnion() << 0 2612 << FixItHint::CreateRemoval(DS.getConstSpecLoc()); 2613 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2614 Diag(DS.getVolatileSpecLoc(), diag::ext_anonymous_struct_union_qualified) 2615 << Record->isUnion() << 1 2616 << FixItHint::CreateRemoval(DS.getVolatileSpecLoc()); 2617 if (DS.getTypeQualifiers() & DeclSpec::TQ_restrict) 2618 Diag(DS.getRestrictSpecLoc(), diag::ext_anonymous_struct_union_qualified) 2619 << Record->isUnion() << 2 2620 << FixItHint::CreateRemoval(DS.getRestrictSpecLoc()); 2621 2622 DS.ClearTypeQualifiers(); 2623 } 2624 2625 // C++ [class.union]p2: 2626 // The member-specification of an anonymous union shall only 2627 // define non-static data members. [Note: nested types and 2628 // functions cannot be declared within an anonymous union. ] 2629 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 2630 MemEnd = Record->decls_end(); 2631 Mem != MemEnd; ++Mem) { 2632 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 2633 // C++ [class.union]p3: 2634 // An anonymous union shall not have private or protected 2635 // members (clause 11). 2636 assert(FD->getAccess() != AS_none); 2637 if (FD->getAccess() != AS_public) { 2638 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 2639 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 2640 Invalid = true; 2641 } 2642 2643 // C++ [class.union]p1 2644 // An object of a class with a non-trivial constructor, a non-trivial 2645 // copy constructor, a non-trivial destructor, or a non-trivial copy 2646 // assignment operator cannot be a member of a union, nor can an 2647 // array of such objects. 2648 if (!getLangOptions().CPlusPlus0x && CheckNontrivialField(FD)) 2649 Invalid = true; 2650 } else if ((*Mem)->isImplicit()) { 2651 // Any implicit members are fine. 2652 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 2653 // This is a type that showed up in an 2654 // elaborated-type-specifier inside the anonymous struct or 2655 // union, but which actually declares a type outside of the 2656 // anonymous struct or union. It's okay. 2657 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 2658 if (!MemRecord->isAnonymousStructOrUnion() && 2659 MemRecord->getDeclName()) { 2660 // Visual C++ allows type definition in anonymous struct or union. 2661 if (getLangOptions().MicrosoftExt) 2662 Diag(MemRecord->getLocation(), diag::ext_anonymous_record_with_type) 2663 << (int)Record->isUnion(); 2664 else { 2665 // This is a nested type declaration. 2666 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 2667 << (int)Record->isUnion(); 2668 Invalid = true; 2669 } 2670 } 2671 } else if (isa<AccessSpecDecl>(*Mem)) { 2672 // Any access specifier is fine. 2673 } else { 2674 // We have something that isn't a non-static data 2675 // member. Complain about it. 2676 unsigned DK = diag::err_anonymous_record_bad_member; 2677 if (isa<TypeDecl>(*Mem)) 2678 DK = diag::err_anonymous_record_with_type; 2679 else if (isa<FunctionDecl>(*Mem)) 2680 DK = diag::err_anonymous_record_with_function; 2681 else if (isa<VarDecl>(*Mem)) 2682 DK = diag::err_anonymous_record_with_static; 2683 2684 // Visual C++ allows type definition in anonymous struct or union. 2685 if (getLangOptions().MicrosoftExt && 2686 DK == diag::err_anonymous_record_with_type) 2687 Diag((*Mem)->getLocation(), diag::ext_anonymous_record_with_type) 2688 << (int)Record->isUnion(); 2689 else { 2690 Diag((*Mem)->getLocation(), DK) 2691 << (int)Record->isUnion(); 2692 Invalid = true; 2693 } 2694 } 2695 } 2696 } 2697 2698 if (!Record->isUnion() && !Owner->isRecord()) { 2699 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 2700 << (int)getLangOptions().CPlusPlus; 2701 Invalid = true; 2702 } 2703 2704 // Mock up a declarator. 2705 Declarator Dc(DS, Declarator::MemberContext); 2706 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2707 assert(TInfo && "couldn't build declarator info for anonymous struct/union"); 2708 2709 // Create a declaration for this anonymous struct/union. 2710 NamedDecl *Anon = 0; 2711 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 2712 Anon = FieldDecl::Create(Context, OwningClass, 2713 DS.getSourceRange().getBegin(), 2714 Record->getLocation(), 2715 /*IdentifierInfo=*/0, 2716 Context.getTypeDeclType(Record), 2717 TInfo, 2718 /*BitWidth=*/0, /*Mutable=*/false, 2719 /*HasInit=*/false); 2720 Anon->setAccess(AS); 2721 if (getLangOptions().CPlusPlus) 2722 FieldCollector->Add(cast<FieldDecl>(Anon)); 2723 } else { 2724 DeclSpec::SCS SCSpec = DS.getStorageClassSpec(); 2725 assert(SCSpec != DeclSpec::SCS_typedef && 2726 "Parser allowed 'typedef' as storage class VarDecl."); 2727 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 2728 if (SCSpec == DeclSpec::SCS_mutable) { 2729 // mutable can only appear on non-static class members, so it's always 2730 // an error here 2731 Diag(Record->getLocation(), diag::err_mutable_nonmember); 2732 Invalid = true; 2733 SC = SC_None; 2734 } 2735 SCSpec = DS.getStorageClassSpecAsWritten(); 2736 VarDecl::StorageClass SCAsWritten 2737 = StorageClassSpecToVarDeclStorageClass(SCSpec); 2738 2739 Anon = VarDecl::Create(Context, Owner, 2740 DS.getSourceRange().getBegin(), 2741 Record->getLocation(), /*IdentifierInfo=*/0, 2742 Context.getTypeDeclType(Record), 2743 TInfo, SC, SCAsWritten); 2744 2745 // Default-initialize the implicit variable. This initialization will be 2746 // trivial in almost all cases, except if a union member has an in-class 2747 // initializer: 2748 // union { int n = 0; }; 2749 ActOnUninitializedDecl(Anon, /*TypeMayContainAuto=*/false); 2750 } 2751 Anon->setImplicit(); 2752 2753 // Add the anonymous struct/union object to the current 2754 // context. We'll be referencing this object when we refer to one of 2755 // its members. 2756 Owner->addDecl(Anon); 2757 2758 // Inject the members of the anonymous struct/union into the owning 2759 // context and into the identifier resolver chain for name lookup 2760 // purposes. 2761 SmallVector<NamedDecl*, 2> Chain; 2762 Chain.push_back(Anon); 2763 2764 if (InjectAnonymousStructOrUnionMembers(*this, S, Owner, Record, AS, 2765 Chain, false)) 2766 Invalid = true; 2767 2768 // Mark this as an anonymous struct/union type. Note that we do not 2769 // do this until after we have already checked and injected the 2770 // members of this anonymous struct/union type, because otherwise 2771 // the members could be injected twice: once by DeclContext when it 2772 // builds its lookup table, and once by 2773 // InjectAnonymousStructOrUnionMembers. 2774 Record->setAnonymousStructOrUnion(true); 2775 2776 if (Invalid) 2777 Anon->setInvalidDecl(); 2778 2779 return Anon; 2780} 2781 2782/// BuildMicrosoftCAnonymousStruct - Handle the declaration of an 2783/// Microsoft C anonymous structure. 2784/// Ref: http://msdn.microsoft.com/en-us/library/z2cx9y4f.aspx 2785/// Example: 2786/// 2787/// struct A { int a; }; 2788/// struct B { struct A; int b; }; 2789/// 2790/// void foo() { 2791/// B var; 2792/// var.a = 3; 2793/// } 2794/// 2795Decl *Sema::BuildMicrosoftCAnonymousStruct(Scope *S, DeclSpec &DS, 2796 RecordDecl *Record) { 2797 2798 // If there is no Record, get the record via the typedef. 2799 if (!Record) 2800 Record = DS.getRepAsType().get()->getAsStructureType()->getDecl(); 2801 2802 // Mock up a declarator. 2803 Declarator Dc(DS, Declarator::TypeNameContext); 2804 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2805 assert(TInfo && "couldn't build declarator info for anonymous struct"); 2806 2807 // Create a declaration for this anonymous struct. 2808 NamedDecl* Anon = FieldDecl::Create(Context, 2809 cast<RecordDecl>(CurContext), 2810 DS.getSourceRange().getBegin(), 2811 DS.getSourceRange().getBegin(), 2812 /*IdentifierInfo=*/0, 2813 Context.getTypeDeclType(Record), 2814 TInfo, 2815 /*BitWidth=*/0, /*Mutable=*/false, 2816 /*HasInit=*/false); 2817 Anon->setImplicit(); 2818 2819 // Add the anonymous struct object to the current context. 2820 CurContext->addDecl(Anon); 2821 2822 // Inject the members of the anonymous struct into the current 2823 // context and into the identifier resolver chain for name lookup 2824 // purposes. 2825 SmallVector<NamedDecl*, 2> Chain; 2826 Chain.push_back(Anon); 2827 2828 if (InjectAnonymousStructOrUnionMembers(*this, S, CurContext, 2829 Record->getDefinition(), 2830 AS_none, Chain, true)) 2831 Anon->setInvalidDecl(); 2832 2833 return Anon; 2834} 2835 2836/// GetNameForDeclarator - Determine the full declaration name for the 2837/// given Declarator. 2838DeclarationNameInfo Sema::GetNameForDeclarator(Declarator &D) { 2839 return GetNameFromUnqualifiedId(D.getName()); 2840} 2841 2842/// \brief Retrieves the declaration name from a parsed unqualified-id. 2843DeclarationNameInfo 2844Sema::GetNameFromUnqualifiedId(const UnqualifiedId &Name) { 2845 DeclarationNameInfo NameInfo; 2846 NameInfo.setLoc(Name.StartLocation); 2847 2848 switch (Name.getKind()) { 2849 2850 case UnqualifiedId::IK_ImplicitSelfParam: 2851 case UnqualifiedId::IK_Identifier: 2852 NameInfo.setName(Name.Identifier); 2853 NameInfo.setLoc(Name.StartLocation); 2854 return NameInfo; 2855 2856 case UnqualifiedId::IK_OperatorFunctionId: 2857 NameInfo.setName(Context.DeclarationNames.getCXXOperatorName( 2858 Name.OperatorFunctionId.Operator)); 2859 NameInfo.setLoc(Name.StartLocation); 2860 NameInfo.getInfo().CXXOperatorName.BeginOpNameLoc 2861 = Name.OperatorFunctionId.SymbolLocations[0]; 2862 NameInfo.getInfo().CXXOperatorName.EndOpNameLoc 2863 = Name.EndLocation.getRawEncoding(); 2864 return NameInfo; 2865 2866 case UnqualifiedId::IK_LiteralOperatorId: 2867 NameInfo.setName(Context.DeclarationNames.getCXXLiteralOperatorName( 2868 Name.Identifier)); 2869 NameInfo.setLoc(Name.StartLocation); 2870 NameInfo.setCXXLiteralOperatorNameLoc(Name.EndLocation); 2871 return NameInfo; 2872 2873 case UnqualifiedId::IK_ConversionFunctionId: { 2874 TypeSourceInfo *TInfo; 2875 QualType Ty = GetTypeFromParser(Name.ConversionFunctionId, &TInfo); 2876 if (Ty.isNull()) 2877 return DeclarationNameInfo(); 2878 NameInfo.setName(Context.DeclarationNames.getCXXConversionFunctionName( 2879 Context.getCanonicalType(Ty))); 2880 NameInfo.setLoc(Name.StartLocation); 2881 NameInfo.setNamedTypeInfo(TInfo); 2882 return NameInfo; 2883 } 2884 2885 case UnqualifiedId::IK_ConstructorName: { 2886 TypeSourceInfo *TInfo; 2887 QualType Ty = GetTypeFromParser(Name.ConstructorName, &TInfo); 2888 if (Ty.isNull()) 2889 return DeclarationNameInfo(); 2890 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 2891 Context.getCanonicalType(Ty))); 2892 NameInfo.setLoc(Name.StartLocation); 2893 NameInfo.setNamedTypeInfo(TInfo); 2894 return NameInfo; 2895 } 2896 2897 case UnqualifiedId::IK_ConstructorTemplateId: { 2898 // In well-formed code, we can only have a constructor 2899 // template-id that refers to the current context, so go there 2900 // to find the actual type being constructed. 2901 CXXRecordDecl *CurClass = dyn_cast<CXXRecordDecl>(CurContext); 2902 if (!CurClass || CurClass->getIdentifier() != Name.TemplateId->Name) 2903 return DeclarationNameInfo(); 2904 2905 // Determine the type of the class being constructed. 2906 QualType CurClassType = Context.getTypeDeclType(CurClass); 2907 2908 // FIXME: Check two things: that the template-id names the same type as 2909 // CurClassType, and that the template-id does not occur when the name 2910 // was qualified. 2911 2912 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 2913 Context.getCanonicalType(CurClassType))); 2914 NameInfo.setLoc(Name.StartLocation); 2915 // FIXME: should we retrieve TypeSourceInfo? 2916 NameInfo.setNamedTypeInfo(0); 2917 return NameInfo; 2918 } 2919 2920 case UnqualifiedId::IK_DestructorName: { 2921 TypeSourceInfo *TInfo; 2922 QualType Ty = GetTypeFromParser(Name.DestructorName, &TInfo); 2923 if (Ty.isNull()) 2924 return DeclarationNameInfo(); 2925 NameInfo.setName(Context.DeclarationNames.getCXXDestructorName( 2926 Context.getCanonicalType(Ty))); 2927 NameInfo.setLoc(Name.StartLocation); 2928 NameInfo.setNamedTypeInfo(TInfo); 2929 return NameInfo; 2930 } 2931 2932 case UnqualifiedId::IK_TemplateId: { 2933 TemplateName TName = Name.TemplateId->Template.get(); 2934 SourceLocation TNameLoc = Name.TemplateId->TemplateNameLoc; 2935 return Context.getNameForTemplate(TName, TNameLoc); 2936 } 2937 2938 } // switch (Name.getKind()) 2939 2940 llvm_unreachable("Unknown name kind"); 2941} 2942 2943static QualType getCoreType(QualType Ty) { 2944 do { 2945 if (Ty->isPointerType() || Ty->isReferenceType()) 2946 Ty = Ty->getPointeeType(); 2947 else if (Ty->isArrayType()) 2948 Ty = Ty->castAsArrayTypeUnsafe()->getElementType(); 2949 else 2950 return Ty.withoutLocalFastQualifiers(); 2951 } while (true); 2952} 2953 2954/// isNearlyMatchingFunction - Determine whether the C++ functions 2955/// Declaration and Definition are "nearly" matching. This heuristic 2956/// is used to improve diagnostics in the case where an out-of-line 2957/// function definition doesn't match any declaration within the class 2958/// or namespace. Also sets Params to the list of indices to the 2959/// parameters that differ between the declaration and the definition. 2960static bool isNearlyMatchingFunction(ASTContext &Context, 2961 FunctionDecl *Declaration, 2962 FunctionDecl *Definition, 2963 llvm::SmallVectorImpl<unsigned> &Params) { 2964 Params.clear(); 2965 if (Declaration->param_size() != Definition->param_size()) 2966 return false; 2967 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 2968 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 2969 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 2970 2971 // The parameter types are identical 2972 if (Context.hasSameType(DefParamTy, DeclParamTy)) 2973 continue; 2974 2975 QualType DeclParamBaseTy = getCoreType(DeclParamTy); 2976 QualType DefParamBaseTy = getCoreType(DefParamTy); 2977 const IdentifierInfo *DeclTyName = DeclParamBaseTy.getBaseTypeIdentifier(); 2978 const IdentifierInfo *DefTyName = DefParamBaseTy.getBaseTypeIdentifier(); 2979 2980 if (Context.hasSameUnqualifiedType(DeclParamBaseTy, DefParamBaseTy) || 2981 (DeclTyName && DeclTyName == DefTyName)) 2982 Params.push_back(Idx); 2983 else // The two parameters aren't even close 2984 return false; 2985 } 2986 2987 return true; 2988} 2989 2990/// NeedsRebuildingInCurrentInstantiation - Checks whether the given 2991/// declarator needs to be rebuilt in the current instantiation. 2992/// Any bits of declarator which appear before the name are valid for 2993/// consideration here. That's specifically the type in the decl spec 2994/// and the base type in any member-pointer chunks. 2995static bool RebuildDeclaratorInCurrentInstantiation(Sema &S, Declarator &D, 2996 DeclarationName Name) { 2997 // The types we specifically need to rebuild are: 2998 // - typenames, typeofs, and decltypes 2999 // - types which will become injected class names 3000 // Of course, we also need to rebuild any type referencing such a 3001 // type. It's safest to just say "dependent", but we call out a 3002 // few cases here. 3003 3004 DeclSpec &DS = D.getMutableDeclSpec(); 3005 switch (DS.getTypeSpecType()) { 3006 case DeclSpec::TST_typename: 3007 case DeclSpec::TST_typeofType: 3008 case DeclSpec::TST_decltype: 3009 case DeclSpec::TST_underlyingType: { 3010 // Grab the type from the parser. 3011 TypeSourceInfo *TSI = 0; 3012 QualType T = S.GetTypeFromParser(DS.getRepAsType(), &TSI); 3013 if (T.isNull() || !T->isDependentType()) break; 3014 3015 // Make sure there's a type source info. This isn't really much 3016 // of a waste; most dependent types should have type source info 3017 // attached already. 3018 if (!TSI) 3019 TSI = S.Context.getTrivialTypeSourceInfo(T, DS.getTypeSpecTypeLoc()); 3020 3021 // Rebuild the type in the current instantiation. 3022 TSI = S.RebuildTypeInCurrentInstantiation(TSI, D.getIdentifierLoc(), Name); 3023 if (!TSI) return true; 3024 3025 // Store the new type back in the decl spec. 3026 ParsedType LocType = S.CreateParsedType(TSI->getType(), TSI); 3027 DS.UpdateTypeRep(LocType); 3028 break; 3029 } 3030 3031 case DeclSpec::TST_typeofExpr: { 3032 Expr *E = DS.getRepAsExpr(); 3033 ExprResult Result = S.RebuildExprInCurrentInstantiation(E); 3034 if (Result.isInvalid()) return true; 3035 DS.UpdateExprRep(Result.get()); 3036 break; 3037 } 3038 3039 default: 3040 // Nothing to do for these decl specs. 3041 break; 3042 } 3043 3044 // It doesn't matter what order we do this in. 3045 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) { 3046 DeclaratorChunk &Chunk = D.getTypeObject(I); 3047 3048 // The only type information in the declarator which can come 3049 // before the declaration name is the base type of a member 3050 // pointer. 3051 if (Chunk.Kind != DeclaratorChunk::MemberPointer) 3052 continue; 3053 3054 // Rebuild the scope specifier in-place. 3055 CXXScopeSpec &SS = Chunk.Mem.Scope(); 3056 if (S.RebuildNestedNameSpecifierInCurrentInstantiation(SS)) 3057 return true; 3058 } 3059 3060 return false; 3061} 3062 3063Decl *Sema::ActOnDeclarator(Scope *S, Declarator &D) { 3064 return HandleDeclarator(S, D, MultiTemplateParamsArg(*this), 3065 /*IsFunctionDefinition=*/false); 3066} 3067 3068/// DiagnoseClassNameShadow - Implement C++ [class.mem]p13: 3069/// If T is the name of a class, then each of the following shall have a 3070/// name different from T: 3071/// - every static data member of class T; 3072/// - every member function of class T 3073/// - every member of class T that is itself a type; 3074/// \returns true if the declaration name violates these rules. 3075bool Sema::DiagnoseClassNameShadow(DeclContext *DC, 3076 DeclarationNameInfo NameInfo) { 3077 DeclarationName Name = NameInfo.getName(); 3078 3079 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(DC)) 3080 if (Record->getIdentifier() && Record->getDeclName() == Name) { 3081 Diag(NameInfo.getLoc(), diag::err_member_name_of_class) << Name; 3082 return true; 3083 } 3084 3085 return false; 3086} 3087 3088Decl *Sema::HandleDeclarator(Scope *S, Declarator &D, 3089 MultiTemplateParamsArg TemplateParamLists, 3090 bool IsFunctionDefinition) { 3091 // TODO: consider using NameInfo for diagnostic. 3092 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 3093 DeclarationName Name = NameInfo.getName(); 3094 3095 // All of these full declarators require an identifier. If it doesn't have 3096 // one, the ParsedFreeStandingDeclSpec action should be used. 3097 if (!Name) { 3098 if (!D.isInvalidType()) // Reject this if we think it is valid. 3099 Diag(D.getDeclSpec().getSourceRange().getBegin(), 3100 diag::err_declarator_need_ident) 3101 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 3102 return 0; 3103 } else if (DiagnoseUnexpandedParameterPack(NameInfo, UPPC_DeclarationType)) 3104 return 0; 3105 3106 // The scope passed in may not be a decl scope. Zip up the scope tree until 3107 // we find one that is. 3108 while ((S->getFlags() & Scope::DeclScope) == 0 || 3109 (S->getFlags() & Scope::TemplateParamScope) != 0) 3110 S = S->getParent(); 3111 3112 DeclContext *DC = CurContext; 3113 if (D.getCXXScopeSpec().isInvalid()) 3114 D.setInvalidType(); 3115 else if (D.getCXXScopeSpec().isSet()) { 3116 if (DiagnoseUnexpandedParameterPack(D.getCXXScopeSpec(), 3117 UPPC_DeclarationQualifier)) 3118 return 0; 3119 3120 bool EnteringContext = !D.getDeclSpec().isFriendSpecified(); 3121 DC = computeDeclContext(D.getCXXScopeSpec(), EnteringContext); 3122 if (!DC) { 3123 // If we could not compute the declaration context, it's because the 3124 // declaration context is dependent but does not refer to a class, 3125 // class template, or class template partial specialization. Complain 3126 // and return early, to avoid the coming semantic disaster. 3127 Diag(D.getIdentifierLoc(), 3128 diag::err_template_qualified_declarator_no_match) 3129 << (NestedNameSpecifier*)D.getCXXScopeSpec().getScopeRep() 3130 << D.getCXXScopeSpec().getRange(); 3131 return 0; 3132 } 3133 bool IsDependentContext = DC->isDependentContext(); 3134 3135 if (!IsDependentContext && 3136 RequireCompleteDeclContext(D.getCXXScopeSpec(), DC)) 3137 return 0; 3138 3139 if (isa<CXXRecordDecl>(DC)) { 3140 if (!cast<CXXRecordDecl>(DC)->hasDefinition()) { 3141 Diag(D.getIdentifierLoc(), 3142 diag::err_member_def_undefined_record) 3143 << Name << DC << D.getCXXScopeSpec().getRange(); 3144 D.setInvalidType(); 3145 } else if (isa<CXXRecordDecl>(CurContext) && 3146 !D.getDeclSpec().isFriendSpecified()) { 3147 // The user provided a superfluous scope specifier inside a class 3148 // definition: 3149 // 3150 // class X { 3151 // void X::f(); 3152 // }; 3153 if (CurContext->Equals(DC)) 3154 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 3155 << Name << FixItHint::CreateRemoval(D.getCXXScopeSpec().getRange()); 3156 else 3157 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 3158 << Name << D.getCXXScopeSpec().getRange(); 3159 3160 // Pretend that this qualifier was not here. 3161 D.getCXXScopeSpec().clear(); 3162 } 3163 } 3164 3165 // Check whether we need to rebuild the type of the given 3166 // declaration in the current instantiation. 3167 if (EnteringContext && IsDependentContext && 3168 TemplateParamLists.size() != 0) { 3169 ContextRAII SavedContext(*this, DC); 3170 if (RebuildDeclaratorInCurrentInstantiation(*this, D, Name)) 3171 D.setInvalidType(); 3172 } 3173 } 3174 3175 if (DiagnoseClassNameShadow(DC, NameInfo)) 3176 // If this is a typedef, we'll end up spewing multiple diagnostics. 3177 // Just return early; it's safer. 3178 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3179 return 0; 3180 3181 NamedDecl *New; 3182 3183 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 3184 QualType R = TInfo->getType(); 3185 3186 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 3187 UPPC_DeclarationType)) 3188 D.setInvalidType(); 3189 3190 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 3191 ForRedeclaration); 3192 3193 // See if this is a redefinition of a variable in the same scope. 3194 if (!D.getCXXScopeSpec().isSet()) { 3195 bool IsLinkageLookup = false; 3196 3197 // If the declaration we're planning to build will be a function 3198 // or object with linkage, then look for another declaration with 3199 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 3200 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3201 /* Do nothing*/; 3202 else if (R->isFunctionType()) { 3203 if (CurContext->isFunctionOrMethod() || 3204 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3205 IsLinkageLookup = true; 3206 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 3207 IsLinkageLookup = true; 3208 else if (CurContext->getRedeclContext()->isTranslationUnit() && 3209 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3210 IsLinkageLookup = true; 3211 3212 if (IsLinkageLookup) 3213 Previous.clear(LookupRedeclarationWithLinkage); 3214 3215 LookupName(Previous, S, /* CreateBuiltins = */ IsLinkageLookup); 3216 } else { // Something like "int foo::x;" 3217 LookupQualifiedName(Previous, DC); 3218 3219 // Don't consider using declarations as previous declarations for 3220 // out-of-line members. 3221 RemoveUsingDecls(Previous); 3222 3223 // C++ 7.3.1.2p2: 3224 // Members (including explicit specializations of templates) of a named 3225 // namespace can also be defined outside that namespace by explicit 3226 // qualification of the name being defined, provided that the entity being 3227 // defined was already declared in the namespace and the definition appears 3228 // after the point of declaration in a namespace that encloses the 3229 // declarations namespace. 3230 // 3231 // Note that we only check the context at this point. We don't yet 3232 // have enough information to make sure that PrevDecl is actually 3233 // the declaration we want to match. For example, given: 3234 // 3235 // class X { 3236 // void f(); 3237 // void f(float); 3238 // }; 3239 // 3240 // void X::f(int) { } // ill-formed 3241 // 3242 // In this case, PrevDecl will point to the overload set 3243 // containing the two f's declared in X, but neither of them 3244 // matches. 3245 3246 // First check whether we named the global scope. 3247 if (isa<TranslationUnitDecl>(DC)) { 3248 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 3249 << Name << D.getCXXScopeSpec().getRange(); 3250 } else { 3251 DeclContext *Cur = CurContext; 3252 while (isa<LinkageSpecDecl>(Cur)) 3253 Cur = Cur->getParent(); 3254 if (!Cur->Encloses(DC)) { 3255 // The qualifying scope doesn't enclose the original declaration. 3256 // Emit diagnostic based on current scope. 3257 SourceLocation L = D.getIdentifierLoc(); 3258 SourceRange R = D.getCXXScopeSpec().getRange(); 3259 if (isa<FunctionDecl>(Cur)) 3260 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 3261 else 3262 Diag(L, diag::err_invalid_declarator_scope) 3263 << Name << cast<NamedDecl>(DC) << R; 3264 D.setInvalidType(); 3265 } 3266 } 3267 } 3268 3269 if (Previous.isSingleResult() && 3270 Previous.getFoundDecl()->isTemplateParameter()) { 3271 // Maybe we will complain about the shadowed template parameter. 3272 if (!D.isInvalidType()) 3273 if (DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), 3274 Previous.getFoundDecl())) 3275 D.setInvalidType(); 3276 3277 // Just pretend that we didn't see the previous declaration. 3278 Previous.clear(); 3279 } 3280 3281 // In C++, the previous declaration we find might be a tag type 3282 // (class or enum). In this case, the new declaration will hide the 3283 // tag type. Note that this does does not apply if we're declaring a 3284 // typedef (C++ [dcl.typedef]p4). 3285 if (Previous.isSingleTagDecl() && 3286 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 3287 Previous.clear(); 3288 3289 bool Redeclaration = false; 3290 bool AddToScope = true; 3291 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 3292 if (TemplateParamLists.size()) { 3293 Diag(D.getIdentifierLoc(), diag::err_template_typedef); 3294 return 0; 3295 } 3296 3297 New = ActOnTypedefDeclarator(S, D, DC, R, TInfo, Previous, Redeclaration); 3298 } else if (R->isFunctionType()) { 3299 New = ActOnFunctionDeclarator(S, D, DC, R, TInfo, Previous, 3300 move(TemplateParamLists), 3301 IsFunctionDefinition, Redeclaration, 3302 AddToScope); 3303 } else { 3304 New = ActOnVariableDeclarator(S, D, DC, R, TInfo, Previous, 3305 move(TemplateParamLists), 3306 Redeclaration); 3307 } 3308 3309 if (New == 0) 3310 return 0; 3311 3312 // If this has an identifier and is not an invalid redeclaration or 3313 // function template specialization, add it to the scope stack. 3314 if (New->getDeclName() && AddToScope && 3315 !(Redeclaration && New->isInvalidDecl())) 3316 PushOnScopeChains(New, S); 3317 3318 return New; 3319} 3320 3321/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 3322/// types into constant array types in certain situations which would otherwise 3323/// be errors (for GCC compatibility). 3324static QualType TryToFixInvalidVariablyModifiedType(QualType T, 3325 ASTContext &Context, 3326 bool &SizeIsNegative, 3327 llvm::APSInt &Oversized) { 3328 // This method tries to turn a variable array into a constant 3329 // array even when the size isn't an ICE. This is necessary 3330 // for compatibility with code that depends on gcc's buggy 3331 // constant expression folding, like struct {char x[(int)(char*)2];} 3332 SizeIsNegative = false; 3333 Oversized = 0; 3334 3335 if (T->isDependentType()) 3336 return QualType(); 3337 3338 QualifierCollector Qs; 3339 const Type *Ty = Qs.strip(T); 3340 3341 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) { 3342 QualType Pointee = PTy->getPointeeType(); 3343 QualType FixedType = 3344 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative, 3345 Oversized); 3346 if (FixedType.isNull()) return FixedType; 3347 FixedType = Context.getPointerType(FixedType); 3348 return Qs.apply(Context, FixedType); 3349 } 3350 if (const ParenType* PTy = dyn_cast<ParenType>(Ty)) { 3351 QualType Inner = PTy->getInnerType(); 3352 QualType FixedType = 3353 TryToFixInvalidVariablyModifiedType(Inner, Context, SizeIsNegative, 3354 Oversized); 3355 if (FixedType.isNull()) return FixedType; 3356 FixedType = Context.getParenType(FixedType); 3357 return Qs.apply(Context, FixedType); 3358 } 3359 3360 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 3361 if (!VLATy) 3362 return QualType(); 3363 // FIXME: We should probably handle this case 3364 if (VLATy->getElementType()->isVariablyModifiedType()) 3365 return QualType(); 3366 3367 Expr::EvalResult EvalResult; 3368 if (!VLATy->getSizeExpr() || 3369 !VLATy->getSizeExpr()->Evaluate(EvalResult, Context) || 3370 !EvalResult.Val.isInt()) 3371 return QualType(); 3372 3373 // Check whether the array size is negative. 3374 llvm::APSInt &Res = EvalResult.Val.getInt(); 3375 if (Res.isSigned() && Res.isNegative()) { 3376 SizeIsNegative = true; 3377 return QualType(); 3378 } 3379 3380 // Check whether the array is too large to be addressed. 3381 unsigned ActiveSizeBits 3382 = ConstantArrayType::getNumAddressingBits(Context, VLATy->getElementType(), 3383 Res); 3384 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) { 3385 Oversized = Res; 3386 return QualType(); 3387 } 3388 3389 return Context.getConstantArrayType(VLATy->getElementType(), 3390 Res, ArrayType::Normal, 0); 3391} 3392 3393/// \brief Register the given locally-scoped external C declaration so 3394/// that it can be found later for redeclarations 3395void 3396Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, 3397 const LookupResult &Previous, 3398 Scope *S) { 3399 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 3400 "Decl is not a locally-scoped decl!"); 3401 // Note that we have a locally-scoped external with this name. 3402 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 3403 3404 if (!Previous.isSingleResult()) 3405 return; 3406 3407 NamedDecl *PrevDecl = Previous.getFoundDecl(); 3408 3409 // If there was a previous declaration of this variable, it may be 3410 // in our identifier chain. Update the identifier chain with the new 3411 // declaration. 3412 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 3413 // The previous declaration was found on the identifer resolver 3414 // chain, so remove it from its scope. 3415 3416 if (S->isDeclScope(PrevDecl)) { 3417 // Special case for redeclarations in the SAME scope. 3418 // Because this declaration is going to be added to the identifier chain 3419 // later, we should temporarily take it OFF the chain. 3420 IdResolver.RemoveDecl(ND); 3421 3422 } else { 3423 // Find the scope for the original declaration. 3424 while (S && !S->isDeclScope(PrevDecl)) 3425 S = S->getParent(); 3426 } 3427 3428 if (S) 3429 S->RemoveDecl(PrevDecl); 3430 } 3431} 3432 3433llvm::DenseMap<DeclarationName, NamedDecl *>::iterator 3434Sema::findLocallyScopedExternalDecl(DeclarationName Name) { 3435 if (ExternalSource) { 3436 // Load locally-scoped external decls from the external source. 3437 SmallVector<NamedDecl *, 4> Decls; 3438 ExternalSource->ReadLocallyScopedExternalDecls(Decls); 3439 for (unsigned I = 0, N = Decls.size(); I != N; ++I) { 3440 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3441 = LocallyScopedExternalDecls.find(Decls[I]->getDeclName()); 3442 if (Pos == LocallyScopedExternalDecls.end()) 3443 LocallyScopedExternalDecls[Decls[I]->getDeclName()] = Decls[I]; 3444 } 3445 } 3446 3447 return LocallyScopedExternalDecls.find(Name); 3448} 3449 3450/// \brief Diagnose function specifiers on a declaration of an identifier that 3451/// does not identify a function. 3452void Sema::DiagnoseFunctionSpecifiers(Declarator& D) { 3453 // FIXME: We should probably indicate the identifier in question to avoid 3454 // confusion for constructs like "inline int a(), b;" 3455 if (D.getDeclSpec().isInlineSpecified()) 3456 Diag(D.getDeclSpec().getInlineSpecLoc(), 3457 diag::err_inline_non_function); 3458 3459 if (D.getDeclSpec().isVirtualSpecified()) 3460 Diag(D.getDeclSpec().getVirtualSpecLoc(), 3461 diag::err_virtual_non_function); 3462 3463 if (D.getDeclSpec().isExplicitSpecified()) 3464 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3465 diag::err_explicit_non_function); 3466} 3467 3468NamedDecl* 3469Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 3470 QualType R, TypeSourceInfo *TInfo, 3471 LookupResult &Previous, bool &Redeclaration) { 3472 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 3473 if (D.getCXXScopeSpec().isSet()) { 3474 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 3475 << D.getCXXScopeSpec().getRange(); 3476 D.setInvalidType(); 3477 // Pretend we didn't see the scope specifier. 3478 DC = CurContext; 3479 Previous.clear(); 3480 } 3481 3482 if (getLangOptions().CPlusPlus) { 3483 // Check that there are no default arguments (C++ only). 3484 CheckExtraCXXDefaultArguments(D); 3485 } 3486 3487 DiagnoseFunctionSpecifiers(D); 3488 3489 if (D.getDeclSpec().isThreadSpecified()) 3490 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 3491 if (D.getDeclSpec().isConstexprSpecified()) 3492 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 3493 << 1; 3494 3495 if (D.getName().Kind != UnqualifiedId::IK_Identifier) { 3496 Diag(D.getName().StartLocation, diag::err_typedef_not_identifier) 3497 << D.getName().getSourceRange(); 3498 return 0; 3499 } 3500 3501 TypedefDecl *NewTD = ParseTypedefDecl(S, D, R, TInfo); 3502 if (!NewTD) return 0; 3503 3504 // Handle attributes prior to checking for duplicates in MergeVarDecl 3505 ProcessDeclAttributes(S, NewTD, D); 3506 3507 CheckTypedefForVariablyModifiedType(S, NewTD); 3508 3509 return ActOnTypedefNameDecl(S, DC, NewTD, Previous, Redeclaration); 3510} 3511 3512void 3513Sema::CheckTypedefForVariablyModifiedType(Scope *S, TypedefNameDecl *NewTD) { 3514 // C99 6.7.7p2: If a typedef name specifies a variably modified type 3515 // then it shall have block scope. 3516 // Note that variably modified types must be fixed before merging the decl so 3517 // that redeclarations will match. 3518 QualType T = NewTD->getUnderlyingType(); 3519 if (T->isVariablyModifiedType()) { 3520 getCurFunction()->setHasBranchProtectedScope(); 3521 3522 if (S->getFnParent() == 0) { 3523 bool SizeIsNegative; 3524 llvm::APSInt Oversized; 3525 QualType FixedTy = 3526 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 3527 Oversized); 3528 if (!FixedTy.isNull()) { 3529 Diag(NewTD->getLocation(), diag::warn_illegal_constant_array_size); 3530 NewTD->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(FixedTy)); 3531 } else { 3532 if (SizeIsNegative) 3533 Diag(NewTD->getLocation(), diag::err_typecheck_negative_array_size); 3534 else if (T->isVariableArrayType()) 3535 Diag(NewTD->getLocation(), diag::err_vla_decl_in_file_scope); 3536 else if (Oversized.getBoolValue()) 3537 Diag(NewTD->getLocation(), diag::err_array_too_large) << Oversized.toString(10); 3538 else 3539 Diag(NewTD->getLocation(), diag::err_vm_decl_in_file_scope); 3540 NewTD->setInvalidDecl(); 3541 } 3542 } 3543 } 3544} 3545 3546 3547/// ActOnTypedefNameDecl - Perform semantic checking for a declaration which 3548/// declares a typedef-name, either using the 'typedef' type specifier or via 3549/// a C++0x [dcl.typedef]p2 alias-declaration: 'using T = A;'. 3550NamedDecl* 3551Sema::ActOnTypedefNameDecl(Scope *S, DeclContext *DC, TypedefNameDecl *NewTD, 3552 LookupResult &Previous, bool &Redeclaration) { 3553 // Merge the decl with the existing one if appropriate. If the decl is 3554 // in an outer scope, it isn't the same thing. 3555 FilterLookupForScope(Previous, DC, S, /*ConsiderLinkage*/ false, 3556 /*ExplicitInstantiationOrSpecialization=*/false); 3557 if (!Previous.empty()) { 3558 Redeclaration = true; 3559 MergeTypedefNameDecl(NewTD, Previous); 3560 } 3561 3562 // If this is the C FILE type, notify the AST context. 3563 if (IdentifierInfo *II = NewTD->getIdentifier()) 3564 if (!NewTD->isInvalidDecl() && 3565 NewTD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 3566 if (II->isStr("FILE")) 3567 Context.setFILEDecl(NewTD); 3568 else if (II->isStr("jmp_buf")) 3569 Context.setjmp_bufDecl(NewTD); 3570 else if (II->isStr("sigjmp_buf")) 3571 Context.setsigjmp_bufDecl(NewTD); 3572 else if (II->isStr("__builtin_va_list")) 3573 Context.setBuiltinVaListType(Context.getTypedefType(NewTD)); 3574 } 3575 3576 return NewTD; 3577} 3578 3579/// \brief Determines whether the given declaration is an out-of-scope 3580/// previous declaration. 3581/// 3582/// This routine should be invoked when name lookup has found a 3583/// previous declaration (PrevDecl) that is not in the scope where a 3584/// new declaration by the same name is being introduced. If the new 3585/// declaration occurs in a local scope, previous declarations with 3586/// linkage may still be considered previous declarations (C99 3587/// 6.2.2p4-5, C++ [basic.link]p6). 3588/// 3589/// \param PrevDecl the previous declaration found by name 3590/// lookup 3591/// 3592/// \param DC the context in which the new declaration is being 3593/// declared. 3594/// 3595/// \returns true if PrevDecl is an out-of-scope previous declaration 3596/// for a new delcaration with the same name. 3597static bool 3598isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 3599 ASTContext &Context) { 3600 if (!PrevDecl) 3601 return false; 3602 3603 if (!PrevDecl->hasLinkage()) 3604 return false; 3605 3606 if (Context.getLangOptions().CPlusPlus) { 3607 // C++ [basic.link]p6: 3608 // If there is a visible declaration of an entity with linkage 3609 // having the same name and type, ignoring entities declared 3610 // outside the innermost enclosing namespace scope, the block 3611 // scope declaration declares that same entity and receives the 3612 // linkage of the previous declaration. 3613 DeclContext *OuterContext = DC->getRedeclContext(); 3614 if (!OuterContext->isFunctionOrMethod()) 3615 // This rule only applies to block-scope declarations. 3616 return false; 3617 3618 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 3619 if (PrevOuterContext->isRecord()) 3620 // We found a member function: ignore it. 3621 return false; 3622 3623 // Find the innermost enclosing namespace for the new and 3624 // previous declarations. 3625 OuterContext = OuterContext->getEnclosingNamespaceContext(); 3626 PrevOuterContext = PrevOuterContext->getEnclosingNamespaceContext(); 3627 3628 // The previous declaration is in a different namespace, so it 3629 // isn't the same function. 3630 if (!OuterContext->Equals(PrevOuterContext)) 3631 return false; 3632 } 3633 3634 return true; 3635} 3636 3637static void SetNestedNameSpecifier(DeclaratorDecl *DD, Declarator &D) { 3638 CXXScopeSpec &SS = D.getCXXScopeSpec(); 3639 if (!SS.isSet()) return; 3640 DD->setQualifierInfo(SS.getWithLocInContext(DD->getASTContext())); 3641} 3642 3643bool Sema::inferObjCARCLifetime(ValueDecl *decl) { 3644 QualType type = decl->getType(); 3645 Qualifiers::ObjCLifetime lifetime = type.getObjCLifetime(); 3646 if (lifetime == Qualifiers::OCL_Autoreleasing) { 3647 // Various kinds of declaration aren't allowed to be __autoreleasing. 3648 unsigned kind = -1U; 3649 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 3650 if (var->hasAttr<BlocksAttr>()) 3651 kind = 0; // __block 3652 else if (!var->hasLocalStorage()) 3653 kind = 1; // global 3654 } else if (isa<ObjCIvarDecl>(decl)) { 3655 kind = 3; // ivar 3656 } else if (isa<FieldDecl>(decl)) { 3657 kind = 2; // field 3658 } 3659 3660 if (kind != -1U) { 3661 Diag(decl->getLocation(), diag::err_arc_autoreleasing_var) 3662 << kind; 3663 } 3664 } else if (lifetime == Qualifiers::OCL_None) { 3665 // Try to infer lifetime. 3666 if (!type->isObjCLifetimeType()) 3667 return false; 3668 3669 lifetime = type->getObjCARCImplicitLifetime(); 3670 type = Context.getLifetimeQualifiedType(type, lifetime); 3671 decl->setType(type); 3672 } 3673 3674 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 3675 // Thread-local variables cannot have lifetime. 3676 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone && 3677 var->isThreadSpecified()) { 3678 Diag(var->getLocation(), diag::err_arc_thread_ownership) 3679 << var->getType(); 3680 return true; 3681 } 3682 } 3683 3684 return false; 3685} 3686 3687NamedDecl* 3688Sema::ActOnVariableDeclarator(Scope *S, Declarator &D, DeclContext *DC, 3689 QualType R, TypeSourceInfo *TInfo, 3690 LookupResult &Previous, 3691 MultiTemplateParamsArg TemplateParamLists, 3692 bool &Redeclaration) { 3693 DeclarationName Name = GetNameForDeclarator(D).getName(); 3694 3695 // Check that there are no default arguments (C++ only). 3696 if (getLangOptions().CPlusPlus) 3697 CheckExtraCXXDefaultArguments(D); 3698 3699 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpec(); 3700 assert(SCSpec != DeclSpec::SCS_typedef && 3701 "Parser allowed 'typedef' as storage class VarDecl."); 3702 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 3703 if (SCSpec == DeclSpec::SCS_mutable) { 3704 // mutable can only appear on non-static class members, so it's always 3705 // an error here 3706 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 3707 D.setInvalidType(); 3708 SC = SC_None; 3709 } 3710 SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 3711 VarDecl::StorageClass SCAsWritten 3712 = StorageClassSpecToVarDeclStorageClass(SCSpec); 3713 3714 IdentifierInfo *II = Name.getAsIdentifierInfo(); 3715 if (!II) { 3716 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 3717 << Name.getAsString(); 3718 return 0; 3719 } 3720 3721 DiagnoseFunctionSpecifiers(D); 3722 3723 if (!DC->isRecord() && S->getFnParent() == 0) { 3724 // C99 6.9p2: The storage-class specifiers auto and register shall not 3725 // appear in the declaration specifiers in an external declaration. 3726 if (SC == SC_Auto || SC == SC_Register) { 3727 3728 // If this is a register variable with an asm label specified, then this 3729 // is a GNU extension. 3730 if (SC == SC_Register && D.getAsmLabel()) 3731 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register); 3732 else 3733 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 3734 D.setInvalidType(); 3735 } 3736 } 3737 3738 if (getLangOptions().OpenCL) { 3739 // Set up the special work-group-local storage class for variables in the 3740 // OpenCL __local address space. 3741 if (R.getAddressSpace() == LangAS::opencl_local) 3742 SC = SC_OpenCLWorkGroupLocal; 3743 } 3744 3745 bool isExplicitSpecialization = false; 3746 VarDecl *NewVD; 3747 if (!getLangOptions().CPlusPlus) { 3748 NewVD = VarDecl::Create(Context, DC, D.getSourceRange().getBegin(), 3749 D.getIdentifierLoc(), II, 3750 R, TInfo, SC, SCAsWritten); 3751 3752 if (D.isInvalidType()) 3753 NewVD->setInvalidDecl(); 3754 } else { 3755 if (DC->isRecord() && !CurContext->isRecord()) { 3756 // This is an out-of-line definition of a static data member. 3757 if (SC == SC_Static) { 3758 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 3759 diag::err_static_out_of_line) 3760 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3761 } else if (SC == SC_None) 3762 SC = SC_Static; 3763 } 3764 if (SC == SC_Static) { 3765 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) { 3766 if (RD->isLocalClass()) 3767 Diag(D.getIdentifierLoc(), 3768 diag::err_static_data_member_not_allowed_in_local_class) 3769 << Name << RD->getDeclName(); 3770 3771 // C++ [class.union]p1: If a union contains a static data member, 3772 // the program is ill-formed. 3773 // 3774 // We also disallow static data members in anonymous structs. 3775 if (CurContext->isRecord() && (RD->isUnion() || !RD->getDeclName())) 3776 Diag(D.getIdentifierLoc(), 3777 diag::err_static_data_member_not_allowed_in_union_or_anon_struct) 3778 << Name << RD->isUnion(); 3779 } 3780 } 3781 3782 // Match up the template parameter lists with the scope specifier, then 3783 // determine whether we have a template or a template specialization. 3784 isExplicitSpecialization = false; 3785 bool Invalid = false; 3786 if (TemplateParameterList *TemplateParams 3787 = MatchTemplateParametersToScopeSpecifier( 3788 D.getDeclSpec().getSourceRange().getBegin(), 3789 D.getIdentifierLoc(), 3790 D.getCXXScopeSpec(), 3791 TemplateParamLists.get(), 3792 TemplateParamLists.size(), 3793 /*never a friend*/ false, 3794 isExplicitSpecialization, 3795 Invalid)) { 3796 if (TemplateParams->size() > 0) { 3797 // There is no such thing as a variable template. 3798 Diag(D.getIdentifierLoc(), diag::err_template_variable) 3799 << II 3800 << SourceRange(TemplateParams->getTemplateLoc(), 3801 TemplateParams->getRAngleLoc()); 3802 return 0; 3803 } else { 3804 // There is an extraneous 'template<>' for this variable. Complain 3805 // about it, but allow the declaration of the variable. 3806 Diag(TemplateParams->getTemplateLoc(), 3807 diag::err_template_variable_noparams) 3808 << II 3809 << SourceRange(TemplateParams->getTemplateLoc(), 3810 TemplateParams->getRAngleLoc()); 3811 } 3812 } 3813 3814 NewVD = VarDecl::Create(Context, DC, D.getSourceRange().getBegin(), 3815 D.getIdentifierLoc(), II, 3816 R, TInfo, SC, SCAsWritten); 3817 3818 // If this decl has an auto type in need of deduction, make a note of the 3819 // Decl so we can diagnose uses of it in its own initializer. 3820 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto && 3821 R->getContainedAutoType()) 3822 ParsingInitForAutoVars.insert(NewVD); 3823 3824 if (D.isInvalidType() || Invalid) 3825 NewVD->setInvalidDecl(); 3826 3827 SetNestedNameSpecifier(NewVD, D); 3828 3829 if (TemplateParamLists.size() > 0 && D.getCXXScopeSpec().isSet()) { 3830 NewVD->setTemplateParameterListsInfo(Context, 3831 TemplateParamLists.size(), 3832 TemplateParamLists.release()); 3833 } 3834 3835 if (D.getDeclSpec().isConstexprSpecified()) { 3836 // FIXME: once we know whether there's an initializer, apply this to 3837 // static data members too. 3838 if (!NewVD->isStaticDataMember() && 3839 !NewVD->isThisDeclarationADefinition()) { 3840 // 'constexpr' is redundant and ill-formed on a non-defining declaration 3841 // of a variable. Suggest replacing it with 'const' if appropriate. 3842 SourceLocation ConstexprLoc = D.getDeclSpec().getConstexprSpecLoc(); 3843 SourceRange ConstexprRange(ConstexprLoc, ConstexprLoc); 3844 // If the declarator is complex, we need to move the keyword to the 3845 // innermost chunk as we switch it from 'constexpr' to 'const'. 3846 int Kind = DeclaratorChunk::Paren; 3847 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) { 3848 Kind = D.getTypeObject(I).Kind; 3849 if (Kind != DeclaratorChunk::Paren) 3850 break; 3851 } 3852 if ((D.getDeclSpec().getTypeQualifiers() & DeclSpec::TQ_const) || 3853 Kind == DeclaratorChunk::Reference) 3854 Diag(ConstexprLoc, diag::err_invalid_constexpr_var_decl) 3855 << FixItHint::CreateRemoval(ConstexprRange); 3856 else if (Kind == DeclaratorChunk::Paren) 3857 Diag(ConstexprLoc, diag::err_invalid_constexpr_var_decl) 3858 << FixItHint::CreateReplacement(ConstexprRange, "const"); 3859 else 3860 Diag(ConstexprLoc, diag::err_invalid_constexpr_var_decl) 3861 << FixItHint::CreateRemoval(ConstexprRange) 3862 << FixItHint::CreateInsertion(D.getIdentifierLoc(), "const "); 3863 } else { 3864 NewVD->setConstexpr(true); 3865 } 3866 } 3867 } 3868 3869 // Set the lexical context. If the declarator has a C++ scope specifier, the 3870 // lexical context will be different from the semantic context. 3871 NewVD->setLexicalDeclContext(CurContext); 3872 3873 if (D.getDeclSpec().isThreadSpecified()) { 3874 if (NewVD->hasLocalStorage()) 3875 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global); 3876 else if (!Context.getTargetInfo().isTLSSupported()) 3877 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported); 3878 else 3879 NewVD->setThreadSpecified(true); 3880 } 3881 3882 if (D.getDeclSpec().isModulePrivateSpecified()) { 3883 if (isExplicitSpecialization) 3884 Diag(NewVD->getLocation(), diag::err_module_private_specialization) 3885 << 2 3886 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 3887 else if (NewVD->hasLocalStorage()) 3888 Diag(NewVD->getLocation(), diag::err_module_private_local) 3889 << 0 << NewVD->getDeclName() 3890 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 3891 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 3892 else 3893 NewVD->setModulePrivate(); 3894 } 3895 3896 // Handle attributes prior to checking for duplicates in MergeVarDecl 3897 ProcessDeclAttributes(S, NewVD, D); 3898 3899 // In auto-retain/release, infer strong retension for variables of 3900 // retainable type. 3901 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewVD)) 3902 NewVD->setInvalidDecl(); 3903 3904 // Handle GNU asm-label extension (encoded as an attribute). 3905 if (Expr *E = (Expr*)D.getAsmLabel()) { 3906 // The parser guarantees this is a string. 3907 StringLiteral *SE = cast<StringLiteral>(E); 3908 StringRef Label = SE->getString(); 3909 if (S->getFnParent() != 0) { 3910 switch (SC) { 3911 case SC_None: 3912 case SC_Auto: 3913 Diag(E->getExprLoc(), diag::warn_asm_label_on_auto_decl) << Label; 3914 break; 3915 case SC_Register: 3916 if (!Context.getTargetInfo().isValidGCCRegisterName(Label)) 3917 Diag(E->getExprLoc(), diag::err_asm_unknown_register_name) << Label; 3918 break; 3919 case SC_Static: 3920 case SC_Extern: 3921 case SC_PrivateExtern: 3922 case SC_OpenCLWorkGroupLocal: 3923 break; 3924 } 3925 } 3926 3927 NewVD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), 3928 Context, Label)); 3929 } 3930 3931 // Diagnose shadowed variables before filtering for scope. 3932 if (!D.getCXXScopeSpec().isSet()) 3933 CheckShadow(S, NewVD, Previous); 3934 3935 // Don't consider existing declarations that are in a different 3936 // scope and are out-of-semantic-context declarations (if the new 3937 // declaration has linkage). 3938 FilterLookupForScope(Previous, DC, S, NewVD->hasLinkage(), 3939 isExplicitSpecialization); 3940 3941 if (!getLangOptions().CPlusPlus) 3942 CheckVariableDeclaration(NewVD, Previous, Redeclaration); 3943 else { 3944 // Merge the decl with the existing one if appropriate. 3945 if (!Previous.empty()) { 3946 if (Previous.isSingleResult() && 3947 isa<FieldDecl>(Previous.getFoundDecl()) && 3948 D.getCXXScopeSpec().isSet()) { 3949 // The user tried to define a non-static data member 3950 // out-of-line (C++ [dcl.meaning]p1). 3951 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 3952 << D.getCXXScopeSpec().getRange(); 3953 Previous.clear(); 3954 NewVD->setInvalidDecl(); 3955 } 3956 } else if (D.getCXXScopeSpec().isSet()) { 3957 // No previous declaration in the qualifying scope. 3958 Diag(D.getIdentifierLoc(), diag::err_no_member) 3959 << Name << computeDeclContext(D.getCXXScopeSpec(), true) 3960 << D.getCXXScopeSpec().getRange(); 3961 NewVD->setInvalidDecl(); 3962 } 3963 3964 CheckVariableDeclaration(NewVD, Previous, Redeclaration); 3965 3966 // This is an explicit specialization of a static data member. Check it. 3967 if (isExplicitSpecialization && !NewVD->isInvalidDecl() && 3968 CheckMemberSpecialization(NewVD, Previous)) 3969 NewVD->setInvalidDecl(); 3970 } 3971 3972 // attributes declared post-definition are currently ignored 3973 // FIXME: This should be handled in attribute merging, not 3974 // here. 3975 if (Previous.isSingleResult()) { 3976 VarDecl *Def = dyn_cast<VarDecl>(Previous.getFoundDecl()); 3977 if (Def && (Def = Def->getDefinition()) && 3978 Def != NewVD && D.hasAttributes()) { 3979 Diag(NewVD->getLocation(), diag::warn_attribute_precede_definition); 3980 Diag(Def->getLocation(), diag::note_previous_definition); 3981 } 3982 } 3983 3984 // If this is a locally-scoped extern C variable, update the map of 3985 // such variables. 3986 if (CurContext->isFunctionOrMethod() && NewVD->isExternC() && 3987 !NewVD->isInvalidDecl()) 3988 RegisterLocallyScopedExternCDecl(NewVD, Previous, S); 3989 3990 // If there's a #pragma GCC visibility in scope, and this isn't a class 3991 // member, set the visibility of this variable. 3992 if (NewVD->getLinkage() == ExternalLinkage && !DC->isRecord()) 3993 AddPushedVisibilityAttribute(NewVD); 3994 3995 MarkUnusedFileScopedDecl(NewVD); 3996 3997 return NewVD; 3998} 3999 4000/// \brief Diagnose variable or built-in function shadowing. Implements 4001/// -Wshadow. 4002/// 4003/// This method is called whenever a VarDecl is added to a "useful" 4004/// scope. 4005/// 4006/// \param S the scope in which the shadowing name is being declared 4007/// \param R the lookup of the name 4008/// 4009void Sema::CheckShadow(Scope *S, VarDecl *D, const LookupResult& R) { 4010 // Return if warning is ignored. 4011 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, R.getNameLoc()) == 4012 DiagnosticsEngine::Ignored) 4013 return; 4014 4015 // Don't diagnose declarations at file scope. 4016 if (D->hasGlobalStorage()) 4017 return; 4018 4019 DeclContext *NewDC = D->getDeclContext(); 4020 4021 // Only diagnose if we're shadowing an unambiguous field or variable. 4022 if (R.getResultKind() != LookupResult::Found) 4023 return; 4024 4025 NamedDecl* ShadowedDecl = R.getFoundDecl(); 4026 if (!isa<VarDecl>(ShadowedDecl) && !isa<FieldDecl>(ShadowedDecl)) 4027 return; 4028 4029 // Fields are not shadowed by variables in C++ static methods. 4030 if (isa<FieldDecl>(ShadowedDecl)) 4031 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewDC)) 4032 if (MD->isStatic()) 4033 return; 4034 4035 if (VarDecl *shadowedVar = dyn_cast<VarDecl>(ShadowedDecl)) 4036 if (shadowedVar->isExternC()) { 4037 // For shadowing external vars, make sure that we point to the global 4038 // declaration, not a locally scoped extern declaration. 4039 for (VarDecl::redecl_iterator 4040 I = shadowedVar->redecls_begin(), E = shadowedVar->redecls_end(); 4041 I != E; ++I) 4042 if (I->isFileVarDecl()) { 4043 ShadowedDecl = *I; 4044 break; 4045 } 4046 } 4047 4048 DeclContext *OldDC = ShadowedDecl->getDeclContext(); 4049 4050 // Only warn about certain kinds of shadowing for class members. 4051 if (NewDC && NewDC->isRecord()) { 4052 // In particular, don't warn about shadowing non-class members. 4053 if (!OldDC->isRecord()) 4054 return; 4055 4056 // TODO: should we warn about static data members shadowing 4057 // static data members from base classes? 4058 4059 // TODO: don't diagnose for inaccessible shadowed members. 4060 // This is hard to do perfectly because we might friend the 4061 // shadowing context, but that's just a false negative. 4062 } 4063 4064 // Determine what kind of declaration we're shadowing. 4065 unsigned Kind; 4066 if (isa<RecordDecl>(OldDC)) { 4067 if (isa<FieldDecl>(ShadowedDecl)) 4068 Kind = 3; // field 4069 else 4070 Kind = 2; // static data member 4071 } else if (OldDC->isFileContext()) 4072 Kind = 1; // global 4073 else 4074 Kind = 0; // local 4075 4076 DeclarationName Name = R.getLookupName(); 4077 4078 // Emit warning and note. 4079 Diag(R.getNameLoc(), diag::warn_decl_shadow) << Name << Kind << OldDC; 4080 Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration); 4081} 4082 4083/// \brief Check -Wshadow without the advantage of a previous lookup. 4084void Sema::CheckShadow(Scope *S, VarDecl *D) { 4085 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, D->getLocation()) == 4086 DiagnosticsEngine::Ignored) 4087 return; 4088 4089 LookupResult R(*this, D->getDeclName(), D->getLocation(), 4090 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4091 LookupName(R, S); 4092 CheckShadow(S, D, R); 4093} 4094 4095/// \brief Perform semantic checking on a newly-created variable 4096/// declaration. 4097/// 4098/// This routine performs all of the type-checking required for a 4099/// variable declaration once it has been built. It is used both to 4100/// check variables after they have been parsed and their declarators 4101/// have been translated into a declaration, and to check variables 4102/// that have been instantiated from a template. 4103/// 4104/// Sets NewVD->isInvalidDecl() if an error was encountered. 4105void Sema::CheckVariableDeclaration(VarDecl *NewVD, 4106 LookupResult &Previous, 4107 bool &Redeclaration) { 4108 // If the decl is already known invalid, don't check it. 4109 if (NewVD->isInvalidDecl()) 4110 return; 4111 4112 QualType T = NewVD->getType(); 4113 4114 if (T->isObjCObjectType()) { 4115 Diag(NewVD->getLocation(), diag::err_statically_allocated_object) 4116 << FixItHint::CreateInsertion(NewVD->getLocation(), "*"); 4117 T = Context.getObjCObjectPointerType(T); 4118 NewVD->setType(T); 4119 } 4120 4121 // Emit an error if an address space was applied to decl with local storage. 4122 // This includes arrays of objects with address space qualifiers, but not 4123 // automatic variables that point to other address spaces. 4124 // ISO/IEC TR 18037 S5.1.2 4125 if (NewVD->hasLocalStorage() && T.getAddressSpace() != 0) { 4126 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 4127 return NewVD->setInvalidDecl(); 4128 } 4129 4130 if (NewVD->hasLocalStorage() && T.isObjCGCWeak() 4131 && !NewVD->hasAttr<BlocksAttr>()) { 4132 if (getLangOptions().getGC() != LangOptions::NonGC) 4133 Diag(NewVD->getLocation(), diag::warn_gc_attribute_weak_on_local); 4134 else 4135 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 4136 } 4137 4138 bool isVM = T->isVariablyModifiedType(); 4139 if (isVM || NewVD->hasAttr<CleanupAttr>() || 4140 NewVD->hasAttr<BlocksAttr>()) 4141 getCurFunction()->setHasBranchProtectedScope(); 4142 4143 if ((isVM && NewVD->hasLinkage()) || 4144 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { 4145 bool SizeIsNegative; 4146 llvm::APSInt Oversized; 4147 QualType FixedTy = 4148 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 4149 Oversized); 4150 4151 if (FixedTy.isNull() && T->isVariableArrayType()) { 4152 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 4153 // FIXME: This won't give the correct result for 4154 // int a[10][n]; 4155 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 4156 4157 if (NewVD->isFileVarDecl()) 4158 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 4159 << SizeRange; 4160 else if (NewVD->getStorageClass() == SC_Static) 4161 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 4162 << SizeRange; 4163 else 4164 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 4165 << SizeRange; 4166 return NewVD->setInvalidDecl(); 4167 } 4168 4169 if (FixedTy.isNull()) { 4170 if (NewVD->isFileVarDecl()) 4171 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 4172 else 4173 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 4174 return NewVD->setInvalidDecl(); 4175 } 4176 4177 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 4178 NewVD->setType(FixedTy); 4179 } 4180 4181 if (Previous.empty() && NewVD->isExternC()) { 4182 // Since we did not find anything by this name and we're declaring 4183 // an extern "C" variable, look for a non-visible extern "C" 4184 // declaration with the same name. 4185 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 4186 = findLocallyScopedExternalDecl(NewVD->getDeclName()); 4187 if (Pos != LocallyScopedExternalDecls.end()) 4188 Previous.addDecl(Pos->second); 4189 } 4190 4191 if (T->isVoidType() && !NewVD->hasExternalStorage()) { 4192 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 4193 << T; 4194 return NewVD->setInvalidDecl(); 4195 } 4196 4197 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { 4198 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); 4199 return NewVD->setInvalidDecl(); 4200 } 4201 4202 if (isVM && NewVD->hasAttr<BlocksAttr>()) { 4203 Diag(NewVD->getLocation(), diag::err_block_on_vm); 4204 return NewVD->setInvalidDecl(); 4205 } 4206 4207 // Function pointers and references cannot have qualified function type, only 4208 // function pointer-to-members can do that. 4209 QualType Pointee; 4210 unsigned PtrOrRef = 0; 4211 if (const PointerType *Ptr = T->getAs<PointerType>()) 4212 Pointee = Ptr->getPointeeType(); 4213 else if (const ReferenceType *Ref = T->getAs<ReferenceType>()) { 4214 Pointee = Ref->getPointeeType(); 4215 PtrOrRef = 1; 4216 } 4217 if (!Pointee.isNull() && Pointee->isFunctionProtoType() && 4218 Pointee->getAs<FunctionProtoType>()->getTypeQuals() != 0) { 4219 Diag(NewVD->getLocation(), diag::err_invalid_qualified_function_pointer) 4220 << PtrOrRef; 4221 return NewVD->setInvalidDecl(); 4222 } 4223 4224 if (!Previous.empty()) { 4225 Redeclaration = true; 4226 MergeVarDecl(NewVD, Previous); 4227 } 4228} 4229 4230/// \brief Data used with FindOverriddenMethod 4231struct FindOverriddenMethodData { 4232 Sema *S; 4233 CXXMethodDecl *Method; 4234}; 4235 4236/// \brief Member lookup function that determines whether a given C++ 4237/// method overrides a method in a base class, to be used with 4238/// CXXRecordDecl::lookupInBases(). 4239static bool FindOverriddenMethod(const CXXBaseSpecifier *Specifier, 4240 CXXBasePath &Path, 4241 void *UserData) { 4242 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4243 4244 FindOverriddenMethodData *Data 4245 = reinterpret_cast<FindOverriddenMethodData*>(UserData); 4246 4247 DeclarationName Name = Data->Method->getDeclName(); 4248 4249 // FIXME: Do we care about other names here too? 4250 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4251 // We really want to find the base class destructor here. 4252 QualType T = Data->S->Context.getTypeDeclType(BaseRecord); 4253 CanQualType CT = Data->S->Context.getCanonicalType(T); 4254 4255 Name = Data->S->Context.DeclarationNames.getCXXDestructorName(CT); 4256 } 4257 4258 for (Path.Decls = BaseRecord->lookup(Name); 4259 Path.Decls.first != Path.Decls.second; 4260 ++Path.Decls.first) { 4261 NamedDecl *D = *Path.Decls.first; 4262 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4263 if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD, false)) 4264 return true; 4265 } 4266 } 4267 4268 return false; 4269} 4270 4271/// AddOverriddenMethods - See if a method overrides any in the base classes, 4272/// and if so, check that it's a valid override and remember it. 4273bool Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4274 // Look for virtual methods in base classes that this method might override. 4275 CXXBasePaths Paths; 4276 FindOverriddenMethodData Data; 4277 Data.Method = MD; 4278 Data.S = this; 4279 bool AddedAny = false; 4280 if (DC->lookupInBases(&FindOverriddenMethod, &Data, Paths)) { 4281 for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(), 4282 E = Paths.found_decls_end(); I != E; ++I) { 4283 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) { 4284 MD->addOverriddenMethod(OldMD->getCanonicalDecl()); 4285 if (!CheckOverridingFunctionReturnType(MD, OldMD) && 4286 !CheckOverridingFunctionExceptionSpec(MD, OldMD) && 4287 !CheckIfOverriddenFunctionIsMarkedFinal(MD, OldMD)) { 4288 AddedAny = true; 4289 } 4290 } 4291 } 4292 } 4293 4294 return AddedAny; 4295} 4296 4297static void DiagnoseInvalidRedeclaration(Sema &S, FunctionDecl *NewFD, 4298 bool isFriendDecl) { 4299 DeclarationName Name = NewFD->getDeclName(); 4300 DeclContext *DC = NewFD->getDeclContext(); 4301 LookupResult Prev(S, Name, NewFD->getLocation(), 4302 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4303 llvm::SmallVector<unsigned, 1> MismatchedParams; 4304 llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1> NearMatches; 4305 TypoCorrection Correction; 4306 unsigned DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend 4307 : diag::err_member_def_does_not_match; 4308 4309 NewFD->setInvalidDecl(); 4310 S.LookupQualifiedName(Prev, DC); 4311 assert(!Prev.isAmbiguous() && 4312 "Cannot have an ambiguity in previous-declaration lookup"); 4313 if (!Prev.empty()) { 4314 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 4315 Func != FuncEnd; ++Func) { 4316 FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func); 4317 if (FD && isNearlyMatchingFunction(S.Context, FD, NewFD, 4318 MismatchedParams)) { 4319 // Add 1 to the index so that 0 can mean the mismatch didn't 4320 // involve a parameter 4321 unsigned ParamNum = 4322 MismatchedParams.empty() ? 0 : MismatchedParams.front() + 1; 4323 NearMatches.push_back(std::make_pair(FD, ParamNum)); 4324 } 4325 } 4326 // If the qualified name lookup yielded nothing, try typo correction 4327 } else if ((Correction = S.CorrectTypo(Prev.getLookupNameInfo(), 4328 Prev.getLookupKind(), 0, 0, DC)) && 4329 Correction.getCorrection() != Name) { 4330 for (TypoCorrection::decl_iterator CDecl = Correction.begin(), 4331 CDeclEnd = Correction.end(); 4332 CDecl != CDeclEnd; ++CDecl) { 4333 FunctionDecl *FD = dyn_cast<FunctionDecl>(*CDecl); 4334 if (FD && isNearlyMatchingFunction(S.Context, FD, NewFD, 4335 MismatchedParams)) { 4336 // Add 1 to the index so that 0 can mean the mismatch didn't 4337 // involve a parameter 4338 unsigned ParamNum = 4339 MismatchedParams.empty() ? 0 : MismatchedParams.front() + 1; 4340 NearMatches.push_back(std::make_pair(FD, ParamNum)); 4341 } 4342 } 4343 if (!NearMatches.empty()) 4344 DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend_suggest 4345 : diag::err_member_def_does_not_match_suggest; 4346 } 4347 4348 // Ignore the correction if it didn't yield any close FunctionDecl matches 4349 if (Correction && NearMatches.empty()) 4350 Correction = TypoCorrection(); 4351 4352 if (Correction) 4353 S.Diag(NewFD->getLocation(), DiagMsg) 4354 << Name << DC << Correction.getQuoted(S.getLangOptions()) 4355 << FixItHint::CreateReplacement( 4356 NewFD->getLocation(), Correction.getAsString(S.getLangOptions())); 4357 else 4358 S.Diag(NewFD->getLocation(), DiagMsg) << Name << DC << NewFD->getLocation(); 4359 4360 for (llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1>::iterator 4361 NearMatch = NearMatches.begin(), NearMatchEnd = NearMatches.end(); 4362 NearMatch != NearMatchEnd; ++NearMatch) { 4363 FunctionDecl *FD = NearMatch->first; 4364 4365 if (unsigned Idx = NearMatch->second) { 4366 ParmVarDecl *FDParam = FD->getParamDecl(Idx-1); 4367 S.Diag(FDParam->getTypeSpecStartLoc(), 4368 diag::note_member_def_close_param_match) 4369 << Idx << FDParam->getType() << NewFD->getParamDecl(Idx-1)->getType(); 4370 } else if (Correction) { 4371 S.Diag(FD->getLocation(), diag::note_previous_decl) 4372 << Correction.getQuoted(S.getLangOptions()); 4373 } else 4374 S.Diag(FD->getLocation(), diag::note_member_def_close_match); 4375 } 4376} 4377 4378NamedDecl* 4379Sema::ActOnFunctionDeclarator(Scope *S, Declarator &D, DeclContext *DC, 4380 QualType R, TypeSourceInfo *TInfo, 4381 LookupResult &Previous, 4382 MultiTemplateParamsArg TemplateParamLists, 4383 bool IsFunctionDefinition, bool &Redeclaration, 4384 bool &AddToScope) { 4385 assert(R.getTypePtr()->isFunctionType()); 4386 4387 // TODO: consider using NameInfo for diagnostic. 4388 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 4389 DeclarationName Name = NameInfo.getName(); 4390 FunctionDecl::StorageClass SC = SC_None; 4391 switch (D.getDeclSpec().getStorageClassSpec()) { 4392 default: llvm_unreachable("Unknown storage class!"); 4393 case DeclSpec::SCS_auto: 4394 case DeclSpec::SCS_register: 4395 case DeclSpec::SCS_mutable: 4396 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4397 diag::err_typecheck_sclass_func); 4398 D.setInvalidType(); 4399 break; 4400 case DeclSpec::SCS_unspecified: SC = SC_None; break; 4401 case DeclSpec::SCS_extern: SC = SC_Extern; break; 4402 case DeclSpec::SCS_static: { 4403 if (CurContext->getRedeclContext()->isFunctionOrMethod()) { 4404 // C99 6.7.1p5: 4405 // The declaration of an identifier for a function that has 4406 // block scope shall have no explicit storage-class specifier 4407 // other than extern 4408 // See also (C++ [dcl.stc]p4). 4409 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4410 diag::err_static_block_func); 4411 SC = SC_None; 4412 } else 4413 SC = SC_Static; 4414 break; 4415 } 4416 case DeclSpec::SCS_private_extern: SC = SC_PrivateExtern; break; 4417 } 4418 4419 if (D.getDeclSpec().isThreadSpecified()) 4420 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 4421 4422 // Do not allow returning a objc interface by-value. 4423 if (R->getAs<FunctionType>()->getResultType()->isObjCObjectType()) { 4424 Diag(D.getIdentifierLoc(), 4425 diag::err_object_cannot_be_passed_returned_by_value) << 0 4426 << R->getAs<FunctionType>()->getResultType() 4427 << FixItHint::CreateInsertion(D.getIdentifierLoc(), "*"); 4428 4429 QualType T = R->getAs<FunctionType>()->getResultType(); 4430 T = Context.getObjCObjectPointerType(T); 4431 if (const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(R)) { 4432 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 4433 R = Context.getFunctionType(T, FPT->arg_type_begin(), 4434 FPT->getNumArgs(), EPI); 4435 } 4436 else if (isa<FunctionNoProtoType>(R)) 4437 R = Context.getFunctionNoProtoType(T); 4438 } 4439 4440 FunctionDecl *NewFD; 4441 bool isInline = D.getDeclSpec().isInlineSpecified(); 4442 bool isFriend = false; 4443 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 4444 FunctionDecl::StorageClass SCAsWritten 4445 = StorageClassSpecToFunctionDeclStorageClass(SCSpec); 4446 FunctionTemplateDecl *FunctionTemplate = 0; 4447 bool isExplicitSpecialization = false; 4448 bool isFunctionTemplateSpecialization = false; 4449 bool isDependentClassScopeExplicitSpecialization = false; 4450 4451 if (!getLangOptions().CPlusPlus) { 4452 // Determine whether the function was written with a 4453 // prototype. This true when: 4454 // - there is a prototype in the declarator, or 4455 // - the type R of the function is some kind of typedef or other reference 4456 // to a type name (which eventually refers to a function type). 4457 bool HasPrototype = 4458 (D.isFunctionDeclarator() && D.getFunctionTypeInfo().hasPrototype) || 4459 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 4460 4461 NewFD = FunctionDecl::Create(Context, DC, D.getSourceRange().getBegin(), 4462 NameInfo, R, TInfo, SC, SCAsWritten, isInline, 4463 HasPrototype); 4464 if (D.isInvalidType()) 4465 NewFD->setInvalidDecl(); 4466 4467 // Set the lexical context. 4468 NewFD->setLexicalDeclContext(CurContext); 4469 // Filter out previous declarations that don't match the scope. 4470 FilterLookupForScope(Previous, DC, S, NewFD->hasLinkage(), 4471 /*ExplicitInstantiationOrSpecialization=*/false); 4472 } else { 4473 isFriend = D.getDeclSpec().isFriendSpecified(); 4474 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 4475 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 4476 bool isConstexpr = D.getDeclSpec().isConstexprSpecified(); 4477 bool isVirtualOkay = false; 4478 4479 // Check that the return type is not an abstract class type. 4480 // For record types, this is done by the AbstractClassUsageDiagnoser once 4481 // the class has been completely parsed. 4482 if (!DC->isRecord() && 4483 RequireNonAbstractType(D.getIdentifierLoc(), 4484 R->getAs<FunctionType>()->getResultType(), 4485 diag::err_abstract_type_in_decl, 4486 AbstractReturnType)) 4487 D.setInvalidType(); 4488 4489 if (Name.getNameKind() == DeclarationName::CXXConstructorName) { 4490 // This is a C++ constructor declaration. 4491 assert(DC->isRecord() && 4492 "Constructors can only be declared in a member context"); 4493 4494 R = CheckConstructorDeclarator(D, R, SC); 4495 4496 // Create the new declaration 4497 CXXConstructorDecl *NewCD = CXXConstructorDecl::Create( 4498 Context, 4499 cast<CXXRecordDecl>(DC), 4500 D.getSourceRange().getBegin(), 4501 NameInfo, R, TInfo, 4502 isExplicit, isInline, 4503 /*isImplicitlyDeclared=*/false, 4504 isConstexpr); 4505 4506 NewFD = NewCD; 4507 } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4508 // This is a C++ destructor declaration. 4509 if (DC->isRecord()) { 4510 R = CheckDestructorDeclarator(D, R, SC); 4511 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 4512 4513 CXXDestructorDecl *NewDD = CXXDestructorDecl::Create(Context, Record, 4514 D.getSourceRange().getBegin(), 4515 NameInfo, R, TInfo, 4516 isInline, 4517 /*isImplicitlyDeclared=*/false); 4518 NewFD = NewDD; 4519 isVirtualOkay = true; 4520 4521 // If the class is complete, then we now create the implicit exception 4522 // specification. If the class is incomplete or dependent, we can't do 4523 // it yet. 4524 if (getLangOptions().CPlusPlus0x && !Record->isDependentType() && 4525 Record->getDefinition() && !Record->isBeingDefined() && 4526 R->getAs<FunctionProtoType>()->getExceptionSpecType() == EST_None) { 4527 AdjustDestructorExceptionSpec(Record, NewDD); 4528 } 4529 4530 } else { 4531 Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 4532 4533 // Create a FunctionDecl to satisfy the function definition parsing 4534 // code path. 4535 NewFD = FunctionDecl::Create(Context, DC, D.getSourceRange().getBegin(), 4536 D.getIdentifierLoc(), Name, R, TInfo, 4537 SC, SCAsWritten, isInline, 4538 /*hasPrototype=*/true, isConstexpr); 4539 D.setInvalidType(); 4540 } 4541 } else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) { 4542 if (!DC->isRecord()) { 4543 Diag(D.getIdentifierLoc(), 4544 diag::err_conv_function_not_member); 4545 return 0; 4546 } 4547 4548 CheckConversionDeclarator(D, R, SC); 4549 NewFD = CXXConversionDecl::Create(Context, cast<CXXRecordDecl>(DC), 4550 D.getSourceRange().getBegin(), 4551 NameInfo, R, TInfo, 4552 isInline, isExplicit, isConstexpr, 4553 SourceLocation()); 4554 4555 isVirtualOkay = true; 4556 } else if (DC->isRecord()) { 4557 // If the name of the function is the same as the name of the record, 4558 // then this must be an invalid constructor that has a return type. 4559 // (The parser checks for a return type and makes the declarator a 4560 // constructor if it has no return type). 4561 if (Name.getAsIdentifierInfo() && 4562 Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ 4563 Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 4564 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 4565 << SourceRange(D.getIdentifierLoc()); 4566 return 0; 4567 } 4568 4569 bool isStatic = SC == SC_Static; 4570 4571 // [class.free]p1: 4572 // Any allocation function for a class T is a static member 4573 // (even if not explicitly declared static). 4574 if (Name.getCXXOverloadedOperator() == OO_New || 4575 Name.getCXXOverloadedOperator() == OO_Array_New) 4576 isStatic = true; 4577 4578 // [class.free]p6 Any deallocation function for a class X is a static member 4579 // (even if not explicitly declared static). 4580 if (Name.getCXXOverloadedOperator() == OO_Delete || 4581 Name.getCXXOverloadedOperator() == OO_Array_Delete) 4582 isStatic = true; 4583 4584 // This is a C++ method declaration. 4585 CXXMethodDecl *NewMD = CXXMethodDecl::Create( 4586 Context, cast<CXXRecordDecl>(DC), 4587 D.getSourceRange().getBegin(), 4588 NameInfo, R, TInfo, 4589 isStatic, SCAsWritten, isInline, 4590 isConstexpr, 4591 SourceLocation()); 4592 NewFD = NewMD; 4593 4594 isVirtualOkay = !isStatic; 4595 } else { 4596 // Determine whether the function was written with a 4597 // prototype. This true when: 4598 // - we're in C++ (where every function has a prototype), 4599 NewFD = FunctionDecl::Create(Context, DC, D.getSourceRange().getBegin(), 4600 NameInfo, R, TInfo, SC, SCAsWritten, isInline, 4601 true/*HasPrototype*/, isConstexpr); 4602 } 4603 4604 if (isFriend && !isInline && IsFunctionDefinition) { 4605 // C++ [class.friend]p5 4606 // A function can be defined in a friend declaration of a 4607 // class . . . . Such a function is implicitly inline. 4608 NewFD->setImplicitlyInline(); 4609 } 4610 4611 SetNestedNameSpecifier(NewFD, D); 4612 isExplicitSpecialization = false; 4613 isFunctionTemplateSpecialization = false; 4614 if (D.isInvalidType()) 4615 NewFD->setInvalidDecl(); 4616 4617 // Set the lexical context. If the declarator has a C++ 4618 // scope specifier, or is the object of a friend declaration, the 4619 // lexical context will be different from the semantic context. 4620 NewFD->setLexicalDeclContext(CurContext); 4621 4622 // Match up the template parameter lists with the scope specifier, then 4623 // determine whether we have a template or a template specialization. 4624 bool Invalid = false; 4625 if (TemplateParameterList *TemplateParams 4626 = MatchTemplateParametersToScopeSpecifier( 4627 D.getDeclSpec().getSourceRange().getBegin(), 4628 D.getIdentifierLoc(), 4629 D.getCXXScopeSpec(), 4630 TemplateParamLists.get(), 4631 TemplateParamLists.size(), 4632 isFriend, 4633 isExplicitSpecialization, 4634 Invalid)) { 4635 if (TemplateParams->size() > 0) { 4636 // This is a function template 4637 4638 // Check that we can declare a template here. 4639 if (CheckTemplateDeclScope(S, TemplateParams)) 4640 return 0; 4641 4642 // A destructor cannot be a template. 4643 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4644 Diag(NewFD->getLocation(), diag::err_destructor_template); 4645 return 0; 4646 } 4647 4648 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC, 4649 NewFD->getLocation(), 4650 Name, TemplateParams, 4651 NewFD); 4652 FunctionTemplate->setLexicalDeclContext(CurContext); 4653 NewFD->setDescribedFunctionTemplate(FunctionTemplate); 4654 4655 // For source fidelity, store the other template param lists. 4656 if (TemplateParamLists.size() > 1) { 4657 NewFD->setTemplateParameterListsInfo(Context, 4658 TemplateParamLists.size() - 1, 4659 TemplateParamLists.release()); 4660 } 4661 } else { 4662 // This is a function template specialization. 4663 isFunctionTemplateSpecialization = true; 4664 // For source fidelity, store all the template param lists. 4665 NewFD->setTemplateParameterListsInfo(Context, 4666 TemplateParamLists.size(), 4667 TemplateParamLists.release()); 4668 4669 // C++0x [temp.expl.spec]p20 forbids "template<> friend void foo(int);". 4670 if (isFriend) { 4671 // We want to remove the "template<>", found here. 4672 SourceRange RemoveRange = TemplateParams->getSourceRange(); 4673 4674 // If we remove the template<> and the name is not a 4675 // template-id, we're actually silently creating a problem: 4676 // the friend declaration will refer to an untemplated decl, 4677 // and clearly the user wants a template specialization. So 4678 // we need to insert '<>' after the name. 4679 SourceLocation InsertLoc; 4680 if (D.getName().getKind() != UnqualifiedId::IK_TemplateId) { 4681 InsertLoc = D.getName().getSourceRange().getEnd(); 4682 InsertLoc = PP.getLocForEndOfToken(InsertLoc); 4683 } 4684 4685 Diag(D.getIdentifierLoc(), diag::err_template_spec_decl_friend) 4686 << Name << RemoveRange 4687 << FixItHint::CreateRemoval(RemoveRange) 4688 << FixItHint::CreateInsertion(InsertLoc, "<>"); 4689 } 4690 } 4691 } 4692 else { 4693 // All template param lists were matched against the scope specifier: 4694 // this is NOT (an explicit specialization of) a template. 4695 if (TemplateParamLists.size() > 0) 4696 // For source fidelity, store all the template param lists. 4697 NewFD->setTemplateParameterListsInfo(Context, 4698 TemplateParamLists.size(), 4699 TemplateParamLists.release()); 4700 } 4701 4702 if (Invalid) { 4703 NewFD->setInvalidDecl(); 4704 if (FunctionTemplate) 4705 FunctionTemplate->setInvalidDecl(); 4706 } 4707 4708 // C++ [dcl.fct.spec]p5: 4709 // The virtual specifier shall only be used in declarations of 4710 // nonstatic class member functions that appear within a 4711 // member-specification of a class declaration; see 10.3. 4712 // 4713 if (isVirtual && !NewFD->isInvalidDecl()) { 4714 if (!isVirtualOkay) { 4715 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4716 diag::err_virtual_non_function); 4717 } else if (!CurContext->isRecord()) { 4718 // 'virtual' was specified outside of the class. 4719 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4720 diag::err_virtual_out_of_class) 4721 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 4722 } else if (NewFD->getDescribedFunctionTemplate()) { 4723 // C++ [temp.mem]p3: 4724 // A member function template shall not be virtual. 4725 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4726 diag::err_virtual_member_function_template) 4727 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 4728 } else { 4729 // Okay: Add virtual to the method. 4730 NewFD->setVirtualAsWritten(true); 4731 } 4732 } 4733 4734 // C++ [dcl.fct.spec]p3: 4735 // The inline specifier shall not appear on a block scope function declaration. 4736 if (isInline && !NewFD->isInvalidDecl()) { 4737 if (CurContext->isFunctionOrMethod()) { 4738 // 'inline' is not allowed on block scope function declaration. 4739 Diag(D.getDeclSpec().getInlineSpecLoc(), 4740 diag::err_inline_declaration_block_scope) << Name 4741 << FixItHint::CreateRemoval(D.getDeclSpec().getInlineSpecLoc()); 4742 } 4743 } 4744 4745 // C++ [dcl.fct.spec]p6: 4746 // The explicit specifier shall be used only in the declaration of a 4747 // constructor or conversion function within its class definition; see 12.3.1 4748 // and 12.3.2. 4749 if (isExplicit && !NewFD->isInvalidDecl()) { 4750 if (!CurContext->isRecord()) { 4751 // 'explicit' was specified outside of the class. 4752 Diag(D.getDeclSpec().getExplicitSpecLoc(), 4753 diag::err_explicit_out_of_class) 4754 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 4755 } else if (!isa<CXXConstructorDecl>(NewFD) && 4756 !isa<CXXConversionDecl>(NewFD)) { 4757 // 'explicit' was specified on a function that wasn't a constructor 4758 // or conversion function. 4759 Diag(D.getDeclSpec().getExplicitSpecLoc(), 4760 diag::err_explicit_non_ctor_or_conv_function) 4761 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 4762 } 4763 } 4764 4765 if (isConstexpr) { 4766 // C++0x [dcl.constexpr]p2: constexpr functions and constexpr constructors 4767 // are implicitly inline. 4768 NewFD->setImplicitlyInline(); 4769 4770 // FIXME: If this is a redeclaration, check the original declaration was 4771 // marked constepr. 4772 4773 // C++0x [dcl.constexpr]p3: functions declared constexpr are required to 4774 // be either constructors or to return a literal type. Therefore, 4775 // destructors cannot be declared constexpr. 4776 if (isa<CXXDestructorDecl>(NewFD)) 4777 Diag(D.getDeclSpec().getConstexprSpecLoc(), 4778 diag::err_constexpr_dtor); 4779 } 4780 4781 // If __module_private__ was specified, mark the function accordingly. 4782 if (D.getDeclSpec().isModulePrivateSpecified()) { 4783 if (isFunctionTemplateSpecialization) { 4784 SourceLocation ModulePrivateLoc 4785 = D.getDeclSpec().getModulePrivateSpecLoc(); 4786 Diag(ModulePrivateLoc, diag::err_module_private_specialization) 4787 << 0 4788 << FixItHint::CreateRemoval(ModulePrivateLoc); 4789 } else { 4790 NewFD->setModulePrivate(); 4791 if (FunctionTemplate) 4792 FunctionTemplate->setModulePrivate(); 4793 } 4794 } 4795 4796 // Filter out previous declarations that don't match the scope. 4797 FilterLookupForScope(Previous, DC, S, NewFD->hasLinkage(), 4798 isExplicitSpecialization || 4799 isFunctionTemplateSpecialization); 4800 4801 if (isFriend) { 4802 // For now, claim that the objects have no previous declaration. 4803 if (FunctionTemplate) { 4804 FunctionTemplate->setObjectOfFriendDecl(false); 4805 FunctionTemplate->setAccess(AS_public); 4806 } 4807 NewFD->setObjectOfFriendDecl(false); 4808 NewFD->setAccess(AS_public); 4809 } 4810 4811 if (isa<CXXMethodDecl>(NewFD) && DC == CurContext && IsFunctionDefinition) { 4812 // A method is implicitly inline if it's defined in its class 4813 // definition. 4814 NewFD->setImplicitlyInline(); 4815 } 4816 4817 if (SC == SC_Static && isa<CXXMethodDecl>(NewFD) && 4818 !CurContext->isRecord()) { 4819 // C++ [class.static]p1: 4820 // A data or function member of a class may be declared static 4821 // in a class definition, in which case it is a static member of 4822 // the class. 4823 4824 // Complain about the 'static' specifier if it's on an out-of-line 4825 // member function definition. 4826 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4827 diag::err_static_out_of_line) 4828 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 4829 } 4830 } 4831 4832 // Handle GNU asm-label extension (encoded as an attribute). 4833 if (Expr *E = (Expr*) D.getAsmLabel()) { 4834 // The parser guarantees this is a string. 4835 StringLiteral *SE = cast<StringLiteral>(E); 4836 NewFD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), Context, 4837 SE->getString())); 4838 } 4839 4840 // Copy the parameter declarations from the declarator D to the function 4841 // declaration NewFD, if they are available. First scavenge them into Params. 4842 SmallVector<ParmVarDecl*, 16> Params; 4843 if (D.isFunctionDeclarator()) { 4844 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 4845 4846 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 4847 // function that takes no arguments, not a function that takes a 4848 // single void argument. 4849 // We let through "const void" here because Sema::GetTypeForDeclarator 4850 // already checks for that case. 4851 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 4852 FTI.ArgInfo[0].Param && 4853 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()) { 4854 // Empty arg list, don't push any params. 4855 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[0].Param); 4856 4857 // In C++, the empty parameter-type-list must be spelled "void"; a 4858 // typedef of void is not permitted. 4859 if (getLangOptions().CPlusPlus && 4860 Param->getType().getUnqualifiedType() != Context.VoidTy) { 4861 bool IsTypeAlias = false; 4862 if (const TypedefType *TT = Param->getType()->getAs<TypedefType>()) 4863 IsTypeAlias = isa<TypeAliasDecl>(TT->getDecl()); 4864 else if (const TemplateSpecializationType *TST = 4865 Param->getType()->getAs<TemplateSpecializationType>()) 4866 IsTypeAlias = TST->isTypeAlias(); 4867 Diag(Param->getLocation(), diag::err_param_typedef_of_void) 4868 << IsTypeAlias; 4869 } 4870 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 4871 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 4872 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 4873 assert(Param->getDeclContext() != NewFD && "Was set before ?"); 4874 Param->setDeclContext(NewFD); 4875 Params.push_back(Param); 4876 4877 if (Param->isInvalidDecl()) 4878 NewFD->setInvalidDecl(); 4879 } 4880 } 4881 4882 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) { 4883 // When we're declaring a function with a typedef, typeof, etc as in the 4884 // following example, we'll need to synthesize (unnamed) 4885 // parameters for use in the declaration. 4886 // 4887 // @code 4888 // typedef void fn(int); 4889 // fn f; 4890 // @endcode 4891 4892 // Synthesize a parameter for each argument type. 4893 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 4894 AE = FT->arg_type_end(); AI != AE; ++AI) { 4895 ParmVarDecl *Param = 4896 BuildParmVarDeclForTypedef(NewFD, D.getIdentifierLoc(), *AI); 4897 Param->setScopeInfo(0, Params.size()); 4898 Params.push_back(Param); 4899 } 4900 } else { 4901 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && 4902 "Should not need args for typedef of non-prototype fn"); 4903 } 4904 // Finally, we know we have the right number of parameters, install them. 4905 NewFD->setParams(Params); 4906 4907 // Process the non-inheritable attributes on this declaration. 4908 ProcessDeclAttributes(S, NewFD, D, 4909 /*NonInheritable=*/true, /*Inheritable=*/false); 4910 4911 if (!getLangOptions().CPlusPlus) { 4912 // Perform semantic checking on the function declaration. 4913 bool isExplicitSpecialization=false; 4914 if (!NewFD->isInvalidDecl()) { 4915 if (NewFD->getResultType()->isVariablyModifiedType()) { 4916 // Functions returning a variably modified type violate C99 6.7.5.2p2 4917 // because all functions have linkage. 4918 Diag(NewFD->getLocation(), diag::err_vm_func_decl); 4919 NewFD->setInvalidDecl(); 4920 } else { 4921 if (NewFD->isMain()) 4922 CheckMain(NewFD, D.getDeclSpec()); 4923 CheckFunctionDeclaration(S, NewFD, Previous, isExplicitSpecialization, 4924 Redeclaration); 4925 } 4926 } 4927 assert((NewFD->isInvalidDecl() || !Redeclaration || 4928 Previous.getResultKind() != LookupResult::FoundOverloaded) && 4929 "previous declaration set still overloaded"); 4930 } else { 4931 // If the declarator is a template-id, translate the parser's template 4932 // argument list into our AST format. 4933 bool HasExplicitTemplateArgs = false; 4934 TemplateArgumentListInfo TemplateArgs; 4935 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) { 4936 TemplateIdAnnotation *TemplateId = D.getName().TemplateId; 4937 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc); 4938 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc); 4939 ASTTemplateArgsPtr TemplateArgsPtr(*this, 4940 TemplateId->getTemplateArgs(), 4941 TemplateId->NumArgs); 4942 translateTemplateArguments(TemplateArgsPtr, 4943 TemplateArgs); 4944 TemplateArgsPtr.release(); 4945 4946 HasExplicitTemplateArgs = true; 4947 4948 if (NewFD->isInvalidDecl()) { 4949 HasExplicitTemplateArgs = false; 4950 } else if (FunctionTemplate) { 4951 // Function template with explicit template arguments. 4952 Diag(D.getIdentifierLoc(), diag::err_function_template_partial_spec) 4953 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc); 4954 4955 HasExplicitTemplateArgs = false; 4956 } else if (!isFunctionTemplateSpecialization && 4957 !D.getDeclSpec().isFriendSpecified()) { 4958 // We have encountered something that the user meant to be a 4959 // specialization (because it has explicitly-specified template 4960 // arguments) but that was not introduced with a "template<>" (or had 4961 // too few of them). 4962 Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header) 4963 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc) 4964 << FixItHint::CreateInsertion( 4965 D.getDeclSpec().getSourceRange().getBegin(), 4966 "template<> "); 4967 isFunctionTemplateSpecialization = true; 4968 } else { 4969 // "friend void foo<>(int);" is an implicit specialization decl. 4970 isFunctionTemplateSpecialization = true; 4971 } 4972 } else if (isFriend && isFunctionTemplateSpecialization) { 4973 // This combination is only possible in a recovery case; the user 4974 // wrote something like: 4975 // template <> friend void foo(int); 4976 // which we're recovering from as if the user had written: 4977 // friend void foo<>(int); 4978 // Go ahead and fake up a template id. 4979 HasExplicitTemplateArgs = true; 4980 TemplateArgs.setLAngleLoc(D.getIdentifierLoc()); 4981 TemplateArgs.setRAngleLoc(D.getIdentifierLoc()); 4982 } 4983 4984 // If it's a friend (and only if it's a friend), it's possible 4985 // that either the specialized function type or the specialized 4986 // template is dependent, and therefore matching will fail. In 4987 // this case, don't check the specialization yet. 4988 if (isFunctionTemplateSpecialization && isFriend && 4989 (NewFD->getType()->isDependentType() || DC->isDependentContext())) { 4990 assert(HasExplicitTemplateArgs && 4991 "friend function specialization without template args"); 4992 if (CheckDependentFunctionTemplateSpecialization(NewFD, TemplateArgs, 4993 Previous)) 4994 NewFD->setInvalidDecl(); 4995 } else if (isFunctionTemplateSpecialization) { 4996 if (CurContext->isDependentContext() && CurContext->isRecord() 4997 && !isFriend) { 4998 isDependentClassScopeExplicitSpecialization = true; 4999 Diag(NewFD->getLocation(), getLangOptions().MicrosoftExt ? 5000 diag::ext_function_specialization_in_class : 5001 diag::err_function_specialization_in_class) 5002 << NewFD->getDeclName(); 5003 } else if (CheckFunctionTemplateSpecialization(NewFD, 5004 (HasExplicitTemplateArgs ? &TemplateArgs : 0), 5005 Previous)) 5006 NewFD->setInvalidDecl(); 5007 5008 // C++ [dcl.stc]p1: 5009 // A storage-class-specifier shall not be specified in an explicit 5010 // specialization (14.7.3) 5011 if (SC != SC_None) { 5012 if (SC != NewFD->getStorageClass()) 5013 Diag(NewFD->getLocation(), 5014 diag::err_explicit_specialization_inconsistent_storage_class) 5015 << SC 5016 << FixItHint::CreateRemoval( 5017 D.getDeclSpec().getStorageClassSpecLoc()); 5018 5019 else 5020 Diag(NewFD->getLocation(), 5021 diag::ext_explicit_specialization_storage_class) 5022 << FixItHint::CreateRemoval( 5023 D.getDeclSpec().getStorageClassSpecLoc()); 5024 } 5025 5026 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD)) { 5027 if (CheckMemberSpecialization(NewFD, Previous)) 5028 NewFD->setInvalidDecl(); 5029 } 5030 5031 // Perform semantic checking on the function declaration. 5032 if (!isDependentClassScopeExplicitSpecialization) { 5033 if (NewFD->isInvalidDecl()) { 5034 // If this is a class member, mark the class invalid immediately. 5035 // This avoids some consistency errors later. 5036 if (CXXMethodDecl* methodDecl = dyn_cast<CXXMethodDecl>(NewFD)) 5037 methodDecl->getParent()->setInvalidDecl(); 5038 } else { 5039 if (NewFD->isMain()) 5040 CheckMain(NewFD, D.getDeclSpec()); 5041 CheckFunctionDeclaration(S, NewFD, Previous, isExplicitSpecialization, 5042 Redeclaration); 5043 } 5044 } 5045 5046 assert((NewFD->isInvalidDecl() || !Redeclaration || 5047 Previous.getResultKind() != LookupResult::FoundOverloaded) && 5048 "previous declaration set still overloaded"); 5049 5050 NamedDecl *PrincipalDecl = (FunctionTemplate 5051 ? cast<NamedDecl>(FunctionTemplate) 5052 : NewFD); 5053 5054 if (isFriend && Redeclaration) { 5055 AccessSpecifier Access = AS_public; 5056 if (!NewFD->isInvalidDecl()) 5057 Access = NewFD->getPreviousDeclaration()->getAccess(); 5058 5059 NewFD->setAccess(Access); 5060 if (FunctionTemplate) FunctionTemplate->setAccess(Access); 5061 5062 PrincipalDecl->setObjectOfFriendDecl(true); 5063 } 5064 5065 if (NewFD->isOverloadedOperator() && !DC->isRecord() && 5066 PrincipalDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary)) 5067 PrincipalDecl->setNonMemberOperator(); 5068 5069 // If we have a function template, check the template parameter 5070 // list. This will check and merge default template arguments. 5071 if (FunctionTemplate) { 5072 FunctionTemplateDecl *PrevTemplate = FunctionTemplate->getPreviousDeclaration(); 5073 CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(), 5074 PrevTemplate? PrevTemplate->getTemplateParameters() : 0, 5075 D.getDeclSpec().isFriendSpecified() 5076 ? (IsFunctionDefinition 5077 ? TPC_FriendFunctionTemplateDefinition 5078 : TPC_FriendFunctionTemplate) 5079 : (D.getCXXScopeSpec().isSet() && 5080 DC && DC->isRecord() && 5081 DC->isDependentContext()) 5082 ? TPC_ClassTemplateMember 5083 : TPC_FunctionTemplate); 5084 } 5085 5086 if (NewFD->isInvalidDecl()) { 5087 // Ignore all the rest of this. 5088 } else if (!Redeclaration) { 5089 // Fake up an access specifier if it's supposed to be a class member. 5090 if (isa<CXXRecordDecl>(NewFD->getDeclContext())) 5091 NewFD->setAccess(AS_public); 5092 5093 // Qualified decls generally require a previous declaration. 5094 if (D.getCXXScopeSpec().isSet()) { 5095 // ...with the major exception of templated-scope or 5096 // dependent-scope friend declarations. 5097 5098 // TODO: we currently also suppress this check in dependent 5099 // contexts because (1) the parameter depth will be off when 5100 // matching friend templates and (2) we might actually be 5101 // selecting a friend based on a dependent factor. But there 5102 // are situations where these conditions don't apply and we 5103 // can actually do this check immediately. 5104 if (isFriend && 5105 (TemplateParamLists.size() || 5106 D.getCXXScopeSpec().getScopeRep()->isDependent() || 5107 CurContext->isDependentContext())) { 5108 // ignore these 5109 } else { 5110 // The user tried to provide an out-of-line definition for a 5111 // function that is a member of a class or namespace, but there 5112 // was no such member function declared (C++ [class.mfct]p2, 5113 // C++ [namespace.memdef]p2). For example: 5114 // 5115 // class X { 5116 // void f() const; 5117 // }; 5118 // 5119 // void X::f() { } // ill-formed 5120 // 5121 // Complain about this problem, and attempt to suggest close 5122 // matches (e.g., those that differ only in cv-qualifiers and 5123 // whether the parameter types are references). 5124 5125 DiagnoseInvalidRedeclaration(*this, NewFD, false); 5126 } 5127 5128 // Unqualified local friend declarations are required to resolve 5129 // to something. 5130 } else if (isFriend && cast<CXXRecordDecl>(CurContext)->isLocalClass()) { 5131 DiagnoseInvalidRedeclaration(*this, NewFD, true); 5132 } 5133 5134 } else if (!IsFunctionDefinition && D.getCXXScopeSpec().isSet() && 5135 !isFriend && !isFunctionTemplateSpecialization && 5136 !isExplicitSpecialization) { 5137 // An out-of-line member function declaration must also be a 5138 // definition (C++ [dcl.meaning]p1). 5139 // Note that this is not the case for explicit specializations of 5140 // function templates or member functions of class templates, per 5141 // C++ [temp.expl.spec]p2. We also allow these declarations as an extension 5142 // for compatibility with old SWIG code which likes to generate them. 5143 Diag(NewFD->getLocation(), diag::ext_out_of_line_declaration) 5144 << D.getCXXScopeSpec().getRange(); 5145 } 5146 } 5147 5148 5149 // Handle attributes. We need to have merged decls when handling attributes 5150 // (for example to check for conflicts, etc). 5151 // FIXME: This needs to happen before we merge declarations. Then, 5152 // let attribute merging cope with attribute conflicts. 5153 ProcessDeclAttributes(S, NewFD, D, 5154 /*NonInheritable=*/false, /*Inheritable=*/true); 5155 5156 // attributes declared post-definition are currently ignored 5157 // FIXME: This should happen during attribute merging 5158 if (Redeclaration && Previous.isSingleResult()) { 5159 const FunctionDecl *Def; 5160 FunctionDecl *PrevFD = dyn_cast<FunctionDecl>(Previous.getFoundDecl()); 5161 if (PrevFD && PrevFD->isDefined(Def) && D.hasAttributes()) { 5162 Diag(NewFD->getLocation(), diag::warn_attribute_precede_definition); 5163 Diag(Def->getLocation(), diag::note_previous_definition); 5164 } 5165 } 5166 5167 AddKnownFunctionAttributes(NewFD); 5168 5169 if (NewFD->hasAttr<OverloadableAttr>() && 5170 !NewFD->getType()->getAs<FunctionProtoType>()) { 5171 Diag(NewFD->getLocation(), 5172 diag::err_attribute_overloadable_no_prototype) 5173 << NewFD; 5174 5175 // Turn this into a variadic function with no parameters. 5176 const FunctionType *FT = NewFD->getType()->getAs<FunctionType>(); 5177 FunctionProtoType::ExtProtoInfo EPI; 5178 EPI.Variadic = true; 5179 EPI.ExtInfo = FT->getExtInfo(); 5180 5181 QualType R = Context.getFunctionType(FT->getResultType(), 0, 0, EPI); 5182 NewFD->setType(R); 5183 } 5184 5185 // If there's a #pragma GCC visibility in scope, and this isn't a class 5186 // member, set the visibility of this function. 5187 if (NewFD->getLinkage() == ExternalLinkage && !DC->isRecord()) 5188 AddPushedVisibilityAttribute(NewFD); 5189 5190 // If this is a locally-scoped extern C function, update the 5191 // map of such names. 5192 if (CurContext->isFunctionOrMethod() && NewFD->isExternC() 5193 && !NewFD->isInvalidDecl()) 5194 RegisterLocallyScopedExternCDecl(NewFD, Previous, S); 5195 5196 // Set this FunctionDecl's range up to the right paren. 5197 NewFD->setRangeEnd(D.getSourceRange().getEnd()); 5198 5199 if (getLangOptions().CPlusPlus) { 5200 if (FunctionTemplate) { 5201 if (NewFD->isInvalidDecl()) 5202 FunctionTemplate->setInvalidDecl(); 5203 return FunctionTemplate; 5204 } 5205 } 5206 5207 MarkUnusedFileScopedDecl(NewFD); 5208 5209 if (getLangOptions().CUDA) 5210 if (IdentifierInfo *II = NewFD->getIdentifier()) 5211 if (!NewFD->isInvalidDecl() && 5212 NewFD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 5213 if (II->isStr("cudaConfigureCall")) { 5214 if (!R->getAs<FunctionType>()->getResultType()->isScalarType()) 5215 Diag(NewFD->getLocation(), diag::err_config_scalar_return); 5216 5217 Context.setcudaConfigureCallDecl(NewFD); 5218 } 5219 } 5220 5221 // Here we have an function template explicit specialization at class scope. 5222 // The actually specialization will be postponed to template instatiation 5223 // time via the ClassScopeFunctionSpecializationDecl node. 5224 if (isDependentClassScopeExplicitSpecialization) { 5225 ClassScopeFunctionSpecializationDecl *NewSpec = 5226 ClassScopeFunctionSpecializationDecl::Create( 5227 Context, CurContext, SourceLocation(), 5228 cast<CXXMethodDecl>(NewFD)); 5229 CurContext->addDecl(NewSpec); 5230 AddToScope = false; 5231 } 5232 5233 return NewFD; 5234} 5235 5236/// \brief Perform semantic checking of a new function declaration. 5237/// 5238/// Performs semantic analysis of the new function declaration 5239/// NewFD. This routine performs all semantic checking that does not 5240/// require the actual declarator involved in the declaration, and is 5241/// used both for the declaration of functions as they are parsed 5242/// (called via ActOnDeclarator) and for the declaration of functions 5243/// that have been instantiated via C++ template instantiation (called 5244/// via InstantiateDecl). 5245/// 5246/// \param IsExplicitSpecialiation whether this new function declaration is 5247/// an explicit specialization of the previous declaration. 5248/// 5249/// This sets NewFD->isInvalidDecl() to true if there was an error. 5250void Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD, 5251 LookupResult &Previous, 5252 bool IsExplicitSpecialization, 5253 bool &Redeclaration) { 5254 assert(!NewFD->getResultType()->isVariablyModifiedType() 5255 && "Variably modified return types are not handled here"); 5256 5257 // Check for a previous declaration of this name. 5258 if (Previous.empty() && NewFD->isExternC()) { 5259 // Since we did not find anything by this name and we're declaring 5260 // an extern "C" function, look for a non-visible extern "C" 5261 // declaration with the same name. 5262 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 5263 = findLocallyScopedExternalDecl(NewFD->getDeclName()); 5264 if (Pos != LocallyScopedExternalDecls.end()) 5265 Previous.addDecl(Pos->second); 5266 } 5267 5268 // Merge or overload the declaration with an existing declaration of 5269 // the same name, if appropriate. 5270 if (!Previous.empty()) { 5271 // Determine whether NewFD is an overload of PrevDecl or 5272 // a declaration that requires merging. If it's an overload, 5273 // there's no more work to do here; we'll just add the new 5274 // function to the scope. 5275 5276 NamedDecl *OldDecl = 0; 5277 if (!AllowOverloadingOfFunction(Previous, Context)) { 5278 Redeclaration = true; 5279 OldDecl = Previous.getFoundDecl(); 5280 } else { 5281 switch (CheckOverload(S, NewFD, Previous, OldDecl, 5282 /*NewIsUsingDecl*/ false)) { 5283 case Ovl_Match: 5284 Redeclaration = true; 5285 break; 5286 5287 case Ovl_NonFunction: 5288 Redeclaration = true; 5289 break; 5290 5291 case Ovl_Overload: 5292 Redeclaration = false; 5293 break; 5294 } 5295 5296 if (!getLangOptions().CPlusPlus && !NewFD->hasAttr<OverloadableAttr>()) { 5297 // If a function name is overloadable in C, then every function 5298 // with that name must be marked "overloadable". 5299 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 5300 << Redeclaration << NewFD; 5301 NamedDecl *OverloadedDecl = 0; 5302 if (Redeclaration) 5303 OverloadedDecl = OldDecl; 5304 else if (!Previous.empty()) 5305 OverloadedDecl = Previous.getRepresentativeDecl(); 5306 if (OverloadedDecl) 5307 Diag(OverloadedDecl->getLocation(), 5308 diag::note_attribute_overloadable_prev_overload); 5309 NewFD->addAttr(::new (Context) OverloadableAttr(SourceLocation(), 5310 Context)); 5311 } 5312 } 5313 5314 if (Redeclaration) { 5315 // NewFD and OldDecl represent declarations that need to be 5316 // merged. 5317 if (MergeFunctionDecl(NewFD, OldDecl)) 5318 return NewFD->setInvalidDecl(); 5319 5320 Previous.clear(); 5321 Previous.addDecl(OldDecl); 5322 5323 if (FunctionTemplateDecl *OldTemplateDecl 5324 = dyn_cast<FunctionTemplateDecl>(OldDecl)) { 5325 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl()); 5326 FunctionTemplateDecl *NewTemplateDecl 5327 = NewFD->getDescribedFunctionTemplate(); 5328 assert(NewTemplateDecl && "Template/non-template mismatch"); 5329 if (CXXMethodDecl *Method 5330 = dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) { 5331 Method->setAccess(OldTemplateDecl->getAccess()); 5332 NewTemplateDecl->setAccess(OldTemplateDecl->getAccess()); 5333 } 5334 5335 // If this is an explicit specialization of a member that is a function 5336 // template, mark it as a member specialization. 5337 if (IsExplicitSpecialization && 5338 NewTemplateDecl->getInstantiatedFromMemberTemplate()) { 5339 NewTemplateDecl->setMemberSpecialization(); 5340 assert(OldTemplateDecl->isMemberSpecialization()); 5341 } 5342 5343 if (OldTemplateDecl->isModulePrivate()) 5344 NewTemplateDecl->setModulePrivate(); 5345 5346 } else { 5347 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions 5348 NewFD->setAccess(OldDecl->getAccess()); 5349 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 5350 } 5351 } 5352 } 5353 5354 // Semantic checking for this function declaration (in isolation). 5355 if (getLangOptions().CPlusPlus) { 5356 // C++-specific checks. 5357 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { 5358 CheckConstructor(Constructor); 5359 } else if (CXXDestructorDecl *Destructor = 5360 dyn_cast<CXXDestructorDecl>(NewFD)) { 5361 CXXRecordDecl *Record = Destructor->getParent(); 5362 QualType ClassType = Context.getTypeDeclType(Record); 5363 5364 // FIXME: Shouldn't we be able to perform this check even when the class 5365 // type is dependent? Both gcc and edg can handle that. 5366 if (!ClassType->isDependentType()) { 5367 DeclarationName Name 5368 = Context.DeclarationNames.getCXXDestructorName( 5369 Context.getCanonicalType(ClassType)); 5370 if (NewFD->getDeclName() != Name) { 5371 Diag(NewFD->getLocation(), diag::err_destructor_name); 5372 return NewFD->setInvalidDecl(); 5373 } 5374 } 5375 } else if (CXXConversionDecl *Conversion 5376 = dyn_cast<CXXConversionDecl>(NewFD)) { 5377 ActOnConversionDeclarator(Conversion); 5378 } 5379 5380 // Find any virtual functions that this function overrides. 5381 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) { 5382 if (!Method->isFunctionTemplateSpecialization() && 5383 !Method->getDescribedFunctionTemplate()) { 5384 if (AddOverriddenMethods(Method->getParent(), Method)) { 5385 // If the function was marked as "static", we have a problem. 5386 if (NewFD->getStorageClass() == SC_Static) { 5387 Diag(NewFD->getLocation(), diag::err_static_overrides_virtual) 5388 << NewFD->getDeclName(); 5389 for (CXXMethodDecl::method_iterator 5390 Overridden = Method->begin_overridden_methods(), 5391 OverriddenEnd = Method->end_overridden_methods(); 5392 Overridden != OverriddenEnd; 5393 ++Overridden) { 5394 Diag((*Overridden)->getLocation(), 5395 diag::note_overridden_virtual_function); 5396 } 5397 } 5398 } 5399 } 5400 } 5401 5402 // Extra checking for C++ overloaded operators (C++ [over.oper]). 5403 if (NewFD->isOverloadedOperator() && 5404 CheckOverloadedOperatorDeclaration(NewFD)) 5405 return NewFD->setInvalidDecl(); 5406 5407 // Extra checking for C++0x literal operators (C++0x [over.literal]). 5408 if (NewFD->getLiteralIdentifier() && 5409 CheckLiteralOperatorDeclaration(NewFD)) 5410 return NewFD->setInvalidDecl(); 5411 5412 // In C++, check default arguments now that we have merged decls. Unless 5413 // the lexical context is the class, because in this case this is done 5414 // during delayed parsing anyway. 5415 if (!CurContext->isRecord()) 5416 CheckCXXDefaultArguments(NewFD); 5417 5418 // If this function declares a builtin function, check the type of this 5419 // declaration against the expected type for the builtin. 5420 if (unsigned BuiltinID = NewFD->getBuiltinID()) { 5421 ASTContext::GetBuiltinTypeError Error; 5422 QualType T = Context.GetBuiltinType(BuiltinID, Error); 5423 if (!T.isNull() && !Context.hasSameType(T, NewFD->getType())) { 5424 // The type of this function differs from the type of the builtin, 5425 // so forget about the builtin entirely. 5426 Context.BuiltinInfo.ForgetBuiltin(BuiltinID, Context.Idents); 5427 } 5428 } 5429 } 5430} 5431 5432void Sema::CheckMain(FunctionDecl* FD, const DeclSpec& DS) { 5433 // C++ [basic.start.main]p3: A program that declares main to be inline 5434 // or static is ill-formed. 5435 // C99 6.7.4p4: In a hosted environment, the inline function specifier 5436 // shall not appear in a declaration of main. 5437 // static main is not an error under C99, but we should warn about it. 5438 if (FD->getStorageClass() == SC_Static) 5439 Diag(DS.getStorageClassSpecLoc(), getLangOptions().CPlusPlus 5440 ? diag::err_static_main : diag::warn_static_main) 5441 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc()); 5442 if (FD->isInlineSpecified()) 5443 Diag(DS.getInlineSpecLoc(), diag::err_inline_main) 5444 << FixItHint::CreateRemoval(DS.getInlineSpecLoc()); 5445 5446 QualType T = FD->getType(); 5447 assert(T->isFunctionType() && "function decl is not of function type"); 5448 const FunctionType* FT = T->getAs<FunctionType>(); 5449 5450 if (!Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) { 5451 Diag(FD->getTypeSpecStartLoc(), diag::err_main_returns_nonint); 5452 FD->setInvalidDecl(true); 5453 } 5454 5455 // Treat protoless main() as nullary. 5456 if (isa<FunctionNoProtoType>(FT)) return; 5457 5458 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT); 5459 unsigned nparams = FTP->getNumArgs(); 5460 assert(FD->getNumParams() == nparams); 5461 5462 bool HasExtraParameters = (nparams > 3); 5463 5464 // Darwin passes an undocumented fourth argument of type char**. If 5465 // other platforms start sprouting these, the logic below will start 5466 // getting shifty. 5467 if (nparams == 4 && Context.getTargetInfo().getTriple().isOSDarwin()) 5468 HasExtraParameters = false; 5469 5470 if (HasExtraParameters) { 5471 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams; 5472 FD->setInvalidDecl(true); 5473 nparams = 3; 5474 } 5475 5476 // FIXME: a lot of the following diagnostics would be improved 5477 // if we had some location information about types. 5478 5479 QualType CharPP = 5480 Context.getPointerType(Context.getPointerType(Context.CharTy)); 5481 QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP }; 5482 5483 for (unsigned i = 0; i < nparams; ++i) { 5484 QualType AT = FTP->getArgType(i); 5485 5486 bool mismatch = true; 5487 5488 if (Context.hasSameUnqualifiedType(AT, Expected[i])) 5489 mismatch = false; 5490 else if (Expected[i] == CharPP) { 5491 // As an extension, the following forms are okay: 5492 // char const ** 5493 // char const * const * 5494 // char * const * 5495 5496 QualifierCollector qs; 5497 const PointerType* PT; 5498 if ((PT = qs.strip(AT)->getAs<PointerType>()) && 5499 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) && 5500 (QualType(qs.strip(PT->getPointeeType()), 0) == Context.CharTy)) { 5501 qs.removeConst(); 5502 mismatch = !qs.empty(); 5503 } 5504 } 5505 5506 if (mismatch) { 5507 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i]; 5508 // TODO: suggest replacing given type with expected type 5509 FD->setInvalidDecl(true); 5510 } 5511 } 5512 5513 if (nparams == 1 && !FD->isInvalidDecl()) { 5514 Diag(FD->getLocation(), diag::warn_main_one_arg); 5515 } 5516 5517 if (!FD->isInvalidDecl() && FD->getDescribedFunctionTemplate()) { 5518 Diag(FD->getLocation(), diag::err_main_template_decl); 5519 FD->setInvalidDecl(); 5520 } 5521} 5522 5523bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 5524 // FIXME: Need strict checking. In C89, we need to check for 5525 // any assignment, increment, decrement, function-calls, or 5526 // commas outside of a sizeof. In C99, it's the same list, 5527 // except that the aforementioned are allowed in unevaluated 5528 // expressions. Everything else falls under the 5529 // "may accept other forms of constant expressions" exception. 5530 // (We never end up here for C++, so the constant expression 5531 // rules there don't matter.) 5532 if (Init->isConstantInitializer(Context, false)) 5533 return false; 5534 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 5535 << Init->getSourceRange(); 5536 return true; 5537} 5538 5539namespace { 5540 // Visits an initialization expression to see if OrigDecl is evaluated in 5541 // its own initialization and throws a warning if it does. 5542 class SelfReferenceChecker 5543 : public EvaluatedExprVisitor<SelfReferenceChecker> { 5544 Sema &S; 5545 Decl *OrigDecl; 5546 bool isRecordType; 5547 bool isPODType; 5548 5549 public: 5550 typedef EvaluatedExprVisitor<SelfReferenceChecker> Inherited; 5551 5552 SelfReferenceChecker(Sema &S, Decl *OrigDecl) : Inherited(S.Context), 5553 S(S), OrigDecl(OrigDecl) { 5554 isPODType = false; 5555 isRecordType = false; 5556 if (ValueDecl *VD = dyn_cast<ValueDecl>(OrigDecl)) { 5557 isPODType = VD->getType().isPODType(S.Context); 5558 isRecordType = VD->getType()->isRecordType(); 5559 } 5560 } 5561 5562 void VisitExpr(Expr *E) { 5563 if (isa<ObjCMessageExpr>(*E)) return; 5564 if (isRecordType) { 5565 Expr *expr = E; 5566 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 5567 ValueDecl *VD = ME->getMemberDecl(); 5568 if (isa<EnumConstantDecl>(VD) || isa<VarDecl>(VD)) return; 5569 expr = ME->getBase(); 5570 } 5571 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(expr)) { 5572 HandleDeclRefExpr(DRE); 5573 return; 5574 } 5575 } 5576 Inherited::VisitExpr(E); 5577 } 5578 5579 void VisitMemberExpr(MemberExpr *E) { 5580 if (E->getType()->canDecayToPointerType()) return; 5581 if (isa<FieldDecl>(E->getMemberDecl())) 5582 if (DeclRefExpr *DRE 5583 = dyn_cast<DeclRefExpr>(E->getBase()->IgnoreParenImpCasts())) { 5584 HandleDeclRefExpr(DRE); 5585 return; 5586 } 5587 Inherited::VisitMemberExpr(E); 5588 } 5589 5590 void VisitImplicitCastExpr(ImplicitCastExpr *E) { 5591 if ((!isRecordType &&E->getCastKind() == CK_LValueToRValue) || 5592 (isRecordType && E->getCastKind() == CK_NoOp)) { 5593 Expr* SubExpr = E->getSubExpr()->IgnoreParenImpCasts(); 5594 if (MemberExpr *ME = dyn_cast<MemberExpr>(SubExpr)) 5595 SubExpr = ME->getBase()->IgnoreParenImpCasts(); 5596 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(SubExpr)) { 5597 HandleDeclRefExpr(DRE); 5598 return; 5599 } 5600 } 5601 Inherited::VisitImplicitCastExpr(E); 5602 } 5603 5604 void VisitUnaryOperator(UnaryOperator *E) { 5605 // For POD record types, addresses of its own members are well-defined. 5606 if (isRecordType && isPODType) return; 5607 Inherited::VisitUnaryOperator(E); 5608 } 5609 5610 void HandleDeclRefExpr(DeclRefExpr *DRE) { 5611 Decl* ReferenceDecl = DRE->getDecl(); 5612 if (OrigDecl != ReferenceDecl) return; 5613 LookupResult Result(S, DRE->getNameInfo(), Sema::LookupOrdinaryName, 5614 Sema::NotForRedeclaration); 5615 S.DiagRuntimeBehavior(DRE->getLocStart(), DRE, 5616 S.PDiag(diag::warn_uninit_self_reference_in_init) 5617 << Result.getLookupName() 5618 << OrigDecl->getLocation() 5619 << DRE->getSourceRange()); 5620 } 5621 }; 5622} 5623 5624/// CheckSelfReference - Warns if OrigDecl is used in expression E. 5625void Sema::CheckSelfReference(Decl* OrigDecl, Expr *E) { 5626 SelfReferenceChecker(*this, OrigDecl).VisitExpr(E); 5627} 5628 5629/// AddInitializerToDecl - Adds the initializer Init to the 5630/// declaration dcl. If DirectInit is true, this is C++ direct 5631/// initialization rather than copy initialization. 5632void Sema::AddInitializerToDecl(Decl *RealDecl, Expr *Init, 5633 bool DirectInit, bool TypeMayContainAuto) { 5634 // If there is no declaration, there was an error parsing it. Just ignore 5635 // the initializer. 5636 if (RealDecl == 0 || RealDecl->isInvalidDecl()) 5637 return; 5638 5639 // Check for self-references within variable initializers. 5640 if (VarDecl *vd = dyn_cast<VarDecl>(RealDecl)) { 5641 // Variables declared within a function/method body are handled 5642 // by a dataflow analysis. 5643 if (!vd->hasLocalStorage() && !vd->isStaticLocal()) 5644 CheckSelfReference(RealDecl, Init); 5645 } 5646 else { 5647 CheckSelfReference(RealDecl, Init); 5648 } 5649 5650 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 5651 // With declarators parsed the way they are, the parser cannot 5652 // distinguish between a normal initializer and a pure-specifier. 5653 // Thus this grotesque test. 5654 IntegerLiteral *IL; 5655 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 5656 Context.getCanonicalType(IL->getType()) == Context.IntTy) 5657 CheckPureMethod(Method, Init->getSourceRange()); 5658 else { 5659 Diag(Method->getLocation(), diag::err_member_function_initialization) 5660 << Method->getDeclName() << Init->getSourceRange(); 5661 Method->setInvalidDecl(); 5662 } 5663 return; 5664 } 5665 5666 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 5667 if (!VDecl) { 5668 assert(!isa<FieldDecl>(RealDecl) && "field init shouldn't get here"); 5669 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 5670 RealDecl->setInvalidDecl(); 5671 return; 5672 } 5673 5674 // C++0x [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 5675 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 5676 TypeSourceInfo *DeducedType = 0; 5677 if (!DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType)) 5678 Diag(VDecl->getLocation(), diag::err_auto_var_deduction_failure) 5679 << VDecl->getDeclName() << VDecl->getType() << Init->getType() 5680 << Init->getSourceRange(); 5681 if (!DeducedType) { 5682 RealDecl->setInvalidDecl(); 5683 return; 5684 } 5685 VDecl->setTypeSourceInfo(DeducedType); 5686 VDecl->setType(DeducedType->getType()); 5687 5688 // In ARC, infer lifetime. 5689 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(VDecl)) 5690 VDecl->setInvalidDecl(); 5691 5692 // If this is a redeclaration, check that the type we just deduced matches 5693 // the previously declared type. 5694 if (VarDecl *Old = VDecl->getPreviousDeclaration()) 5695 MergeVarDeclTypes(VDecl, Old); 5696 } 5697 5698 5699 // A definition must end up with a complete type, which means it must be 5700 // complete with the restriction that an array type might be completed by the 5701 // initializer; note that later code assumes this restriction. 5702 QualType BaseDeclType = VDecl->getType(); 5703 if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType)) 5704 BaseDeclType = Array->getElementType(); 5705 if (RequireCompleteType(VDecl->getLocation(), BaseDeclType, 5706 diag::err_typecheck_decl_incomplete_type)) { 5707 RealDecl->setInvalidDecl(); 5708 return; 5709 } 5710 5711 // The variable can not have an abstract class type. 5712 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 5713 diag::err_abstract_type_in_decl, 5714 AbstractVariableType)) 5715 VDecl->setInvalidDecl(); 5716 5717 const VarDecl *Def; 5718 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 5719 Diag(VDecl->getLocation(), diag::err_redefinition) 5720 << VDecl->getDeclName(); 5721 Diag(Def->getLocation(), diag::note_previous_definition); 5722 VDecl->setInvalidDecl(); 5723 return; 5724 } 5725 5726 const VarDecl* PrevInit = 0; 5727 if (getLangOptions().CPlusPlus) { 5728 // C++ [class.static.data]p4 5729 // If a static data member is of const integral or const 5730 // enumeration type, its declaration in the class definition can 5731 // specify a constant-initializer which shall be an integral 5732 // constant expression (5.19). In that case, the member can appear 5733 // in integral constant expressions. The member shall still be 5734 // defined in a namespace scope if it is used in the program and the 5735 // namespace scope definition shall not contain an initializer. 5736 // 5737 // We already performed a redefinition check above, but for static 5738 // data members we also need to check whether there was an in-class 5739 // declaration with an initializer. 5740 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 5741 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 5742 Diag(PrevInit->getLocation(), diag::note_previous_definition); 5743 return; 5744 } 5745 5746 if (VDecl->hasLocalStorage()) 5747 getCurFunction()->setHasBranchProtectedScope(); 5748 5749 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) { 5750 VDecl->setInvalidDecl(); 5751 return; 5752 } 5753 } 5754 5755 // OpenCL 1.1 6.5.2: "Variables allocated in the __local address space inside 5756 // a kernel function cannot be initialized." 5757 if (VDecl->getStorageClass() == SC_OpenCLWorkGroupLocal) { 5758 Diag(VDecl->getLocation(), diag::err_local_cant_init); 5759 VDecl->setInvalidDecl(); 5760 return; 5761 } 5762 5763 // Capture the variable that is being initialized and the style of 5764 // initialization. 5765 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 5766 5767 // FIXME: Poor source location information. 5768 InitializationKind Kind 5769 = DirectInit? InitializationKind::CreateDirect(VDecl->getLocation(), 5770 Init->getLocStart(), 5771 Init->getLocEnd()) 5772 : InitializationKind::CreateCopy(VDecl->getLocation(), 5773 Init->getLocStart()); 5774 5775 // Get the decls type and save a reference for later, since 5776 // CheckInitializerTypes may change it. 5777 QualType DclT = VDecl->getType(), SavT = DclT; 5778 if (VDecl->isLocalVarDecl()) { 5779 if (VDecl->hasExternalStorage()) { // C99 6.7.8p5 5780 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 5781 VDecl->setInvalidDecl(); 5782 } else if (!VDecl->isInvalidDecl()) { 5783 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 5784 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 5785 MultiExprArg(*this, &Init, 1), 5786 &DclT); 5787 if (Result.isInvalid()) { 5788 VDecl->setInvalidDecl(); 5789 return; 5790 } 5791 5792 Init = Result.takeAs<Expr>(); 5793 5794 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 5795 // Don't check invalid declarations to avoid emitting useless diagnostics. 5796 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 5797 if (VDecl->getStorageClass() == SC_Static) // C99 6.7.8p4. 5798 CheckForConstantInitializer(Init, DclT); 5799 } 5800 } 5801 } else if (VDecl->isStaticDataMember() && 5802 VDecl->getLexicalDeclContext()->isRecord()) { 5803 // This is an in-class initialization for a static data member, e.g., 5804 // 5805 // struct S { 5806 // static const int value = 17; 5807 // }; 5808 5809 // Try to perform the initialization regardless. 5810 if (!VDecl->isInvalidDecl()) { 5811 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 5812 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 5813 MultiExprArg(*this, &Init, 1), 5814 &DclT); 5815 if (Result.isInvalid()) { 5816 VDecl->setInvalidDecl(); 5817 return; 5818 } 5819 5820 Init = Result.takeAs<Expr>(); 5821 } 5822 5823 // C++ [class.mem]p4: 5824 // A member-declarator can contain a constant-initializer only 5825 // if it declares a static member (9.4) of const integral or 5826 // const enumeration type, see 9.4.2. 5827 // 5828 // C++0x [class.static.data]p3: 5829 // If a non-volatile const static data member is of integral or 5830 // enumeration type, its declaration in the class definition can 5831 // specify a brace-or-equal-initializer in which every initalizer-clause 5832 // that is an assignment-expression is a constant expression. A static 5833 // data member of literal type can be declared in the class definition 5834 // with the constexpr specifier; if so, its declaration shall specify a 5835 // brace-or-equal-initializer in which every initializer-clause that is 5836 // an assignment-expression is a constant expression. 5837 QualType T = VDecl->getType(); 5838 5839 // Do nothing on dependent types. 5840 if (T->isDependentType()) { 5841 5842 // Allow any 'static constexpr' members, whether or not they are of literal 5843 // type. We separately check that the initializer is a constant expression, 5844 // which implicitly requires the member to be of literal type. 5845 } else if (VDecl->isConstexpr()) { 5846 5847 // Require constness. 5848 } else if (!T.isConstQualified()) { 5849 Diag(VDecl->getLocation(), diag::err_in_class_initializer_non_const) 5850 << Init->getSourceRange(); 5851 VDecl->setInvalidDecl(); 5852 5853 // We allow integer constant expressions in all cases. 5854 } else if (T->isIntegralOrEnumerationType()) { 5855 // Check whether the expression is a constant expression. 5856 SourceLocation Loc; 5857 if (getLangOptions().CPlusPlus0x && T.isVolatileQualified()) 5858 // In C++0x, a non-constexpr const static data member with an 5859 // in-class initializer cannot be volatile. 5860 Diag(VDecl->getLocation(), diag::err_in_class_initializer_volatile); 5861 else if (Init->isValueDependent()) 5862 ; // Nothing to check. 5863 else if (Init->isIntegerConstantExpr(Context, &Loc)) 5864 ; // Ok, it's an ICE! 5865 else if (Init->isEvaluatable(Context)) { 5866 // If we can constant fold the initializer through heroics, accept it, 5867 // but report this as a use of an extension for -pedantic. 5868 Diag(Loc, diag::ext_in_class_initializer_non_constant) 5869 << Init->getSourceRange(); 5870 } else { 5871 // Otherwise, this is some crazy unknown case. Report the issue at the 5872 // location provided by the isIntegerConstantExpr failed check. 5873 Diag(Loc, diag::err_in_class_initializer_non_constant) 5874 << Init->getSourceRange(); 5875 VDecl->setInvalidDecl(); 5876 } 5877 5878 // We allow floating-point constants as an extension. 5879 } else if (T->isFloatingType()) { // also permits complex, which is ok 5880 Diag(VDecl->getLocation(), diag::ext_in_class_initializer_float_type) 5881 << T << Init->getSourceRange(); 5882 5883 if (!Init->isValueDependent() && 5884 !Init->isConstantInitializer(Context, false)) { 5885 Diag(Init->getExprLoc(), diag::err_in_class_initializer_non_constant) 5886 << Init->getSourceRange(); 5887 VDecl->setInvalidDecl(); 5888 } 5889 5890 // Suggest adding 'constexpr' in C++0x for literal types. 5891 } else if (getLangOptions().CPlusPlus0x && T->isLiteralType()) { 5892 Diag(VDecl->getLocation(), diag::err_in_class_initializer_literal_type) 5893 << T << Init->getSourceRange() 5894 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr "); 5895 VDecl->setConstexpr(true); 5896 5897 } else { 5898 Diag(VDecl->getLocation(), diag::err_in_class_initializer_bad_type) 5899 << T << Init->getSourceRange(); 5900 VDecl->setInvalidDecl(); 5901 } 5902 } else if (VDecl->isFileVarDecl()) { 5903 if (VDecl->getStorageClassAsWritten() == SC_Extern && 5904 (!getLangOptions().CPlusPlus || 5905 !Context.getBaseElementType(VDecl->getType()).isConstQualified())) 5906 Diag(VDecl->getLocation(), diag::warn_extern_init); 5907 if (!VDecl->isInvalidDecl()) { 5908 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 5909 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 5910 MultiExprArg(*this, &Init, 1), 5911 &DclT); 5912 if (Result.isInvalid()) { 5913 VDecl->setInvalidDecl(); 5914 return; 5915 } 5916 5917 Init = Result.takeAs<Expr>(); 5918 } 5919 5920 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 5921 // Don't check invalid declarations to avoid emitting useless diagnostics. 5922 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 5923 // C99 6.7.8p4. All file scoped initializers need to be constant. 5924 CheckForConstantInitializer(Init, DclT); 5925 } 5926 } 5927 // If the type changed, it means we had an incomplete type that was 5928 // completed by the initializer. For example: 5929 // int ary[] = { 1, 3, 5 }; 5930 // "ary" transitions from a VariableArrayType to a ConstantArrayType. 5931 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 5932 VDecl->setType(DclT); 5933 Init->setType(DclT); 5934 } 5935 5936 // Check any implicit conversions within the expression. 5937 CheckImplicitConversions(Init, VDecl->getLocation()); 5938 5939 if (!VDecl->isInvalidDecl()) 5940 checkUnsafeAssigns(VDecl->getLocation(), VDecl->getType(), Init); 5941 5942 if (VDecl->isConstexpr() && !VDecl->isInvalidDecl() && 5943 !VDecl->getType()->isDependentType() && 5944 !Init->isTypeDependent() && !Init->isValueDependent() && 5945 !Init->isConstantInitializer(Context, 5946 VDecl->getType()->isReferenceType())) { 5947 // FIXME: Improve this diagnostic to explain why the initializer is not 5948 // a constant expression. 5949 Diag(VDecl->getLocation(), diag::err_constexpr_var_requires_const_init) 5950 << VDecl << Init->getSourceRange(); 5951 } 5952 5953 Init = MaybeCreateExprWithCleanups(Init); 5954 // Attach the initializer to the decl. 5955 VDecl->setInit(Init); 5956 5957 CheckCompleteVariableDeclaration(VDecl); 5958} 5959 5960/// ActOnInitializerError - Given that there was an error parsing an 5961/// initializer for the given declaration, try to return to some form 5962/// of sanity. 5963void Sema::ActOnInitializerError(Decl *D) { 5964 // Our main concern here is re-establishing invariants like "a 5965 // variable's type is either dependent or complete". 5966 if (!D || D->isInvalidDecl()) return; 5967 5968 VarDecl *VD = dyn_cast<VarDecl>(D); 5969 if (!VD) return; 5970 5971 // Auto types are meaningless if we can't make sense of the initializer. 5972 if (ParsingInitForAutoVars.count(D)) { 5973 D->setInvalidDecl(); 5974 return; 5975 } 5976 5977 QualType Ty = VD->getType(); 5978 if (Ty->isDependentType()) return; 5979 5980 // Require a complete type. 5981 if (RequireCompleteType(VD->getLocation(), 5982 Context.getBaseElementType(Ty), 5983 diag::err_typecheck_decl_incomplete_type)) { 5984 VD->setInvalidDecl(); 5985 return; 5986 } 5987 5988 // Require an abstract type. 5989 if (RequireNonAbstractType(VD->getLocation(), Ty, 5990 diag::err_abstract_type_in_decl, 5991 AbstractVariableType)) { 5992 VD->setInvalidDecl(); 5993 return; 5994 } 5995 5996 // Don't bother complaining about constructors or destructors, 5997 // though. 5998} 5999 6000void Sema::ActOnUninitializedDecl(Decl *RealDecl, 6001 bool TypeMayContainAuto) { 6002 // If there is no declaration, there was an error parsing it. Just ignore it. 6003 if (RealDecl == 0) 6004 return; 6005 6006 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 6007 QualType Type = Var->getType(); 6008 6009 // C++0x [dcl.spec.auto]p3 6010 if (TypeMayContainAuto && Type->getContainedAutoType()) { 6011 Diag(Var->getLocation(), diag::err_auto_var_requires_init) 6012 << Var->getDeclName() << Type; 6013 Var->setInvalidDecl(); 6014 return; 6015 } 6016 6017 // C++0x [dcl.constexpr]p9: An object or reference declared constexpr must 6018 // have an initializer. 6019 // C++0x [class.static.data]p3: A static data member can be declared with 6020 // the constexpr specifier; if so, its declaration shall specify 6021 // a brace-or-equal-initializer. 6022 if (Var->isConstexpr()) { 6023 // FIXME: Provide fix-its to convert the constexpr to const. 6024 if (Var->isStaticDataMember() && Var->getAnyInitializer()) { 6025 Diag(Var->getLocation(), diag::err_constexpr_initialized_static_member) 6026 << Var->getDeclName(); 6027 } else { 6028 Diag(Var->getLocation(), diag::err_constexpr_var_requires_init) 6029 << Var->getDeclName(); 6030 } 6031 Var->setInvalidDecl(); 6032 return; 6033 } 6034 6035 switch (Var->isThisDeclarationADefinition()) { 6036 case VarDecl::Definition: 6037 if (!Var->isStaticDataMember() || !Var->getAnyInitializer()) 6038 break; 6039 6040 // We have an out-of-line definition of a static data member 6041 // that has an in-class initializer, so we type-check this like 6042 // a declaration. 6043 // 6044 // Fall through 6045 6046 case VarDecl::DeclarationOnly: 6047 // It's only a declaration. 6048 6049 // Block scope. C99 6.7p7: If an identifier for an object is 6050 // declared with no linkage (C99 6.2.2p6), the type for the 6051 // object shall be complete. 6052 if (!Type->isDependentType() && Var->isLocalVarDecl() && 6053 !Var->getLinkage() && !Var->isInvalidDecl() && 6054 RequireCompleteType(Var->getLocation(), Type, 6055 diag::err_typecheck_decl_incomplete_type)) 6056 Var->setInvalidDecl(); 6057 6058 // Make sure that the type is not abstract. 6059 if (!Type->isDependentType() && !Var->isInvalidDecl() && 6060 RequireNonAbstractType(Var->getLocation(), Type, 6061 diag::err_abstract_type_in_decl, 6062 AbstractVariableType)) 6063 Var->setInvalidDecl(); 6064 return; 6065 6066 case VarDecl::TentativeDefinition: 6067 // File scope. C99 6.9.2p2: A declaration of an identifier for an 6068 // object that has file scope without an initializer, and without a 6069 // storage-class specifier or with the storage-class specifier "static", 6070 // constitutes a tentative definition. Note: A tentative definition with 6071 // external linkage is valid (C99 6.2.2p5). 6072 if (!Var->isInvalidDecl()) { 6073 if (const IncompleteArrayType *ArrayT 6074 = Context.getAsIncompleteArrayType(Type)) { 6075 if (RequireCompleteType(Var->getLocation(), 6076 ArrayT->getElementType(), 6077 diag::err_illegal_decl_array_incomplete_type)) 6078 Var->setInvalidDecl(); 6079 } else if (Var->getStorageClass() == SC_Static) { 6080 // C99 6.9.2p3: If the declaration of an identifier for an object is 6081 // a tentative definition and has internal linkage (C99 6.2.2p3), the 6082 // declared type shall not be an incomplete type. 6083 // NOTE: code such as the following 6084 // static struct s; 6085 // struct s { int a; }; 6086 // is accepted by gcc. Hence here we issue a warning instead of 6087 // an error and we do not invalidate the static declaration. 6088 // NOTE: to avoid multiple warnings, only check the first declaration. 6089 if (Var->getPreviousDeclaration() == 0) 6090 RequireCompleteType(Var->getLocation(), Type, 6091 diag::ext_typecheck_decl_incomplete_type); 6092 } 6093 } 6094 6095 // Record the tentative definition; we're done. 6096 if (!Var->isInvalidDecl()) 6097 TentativeDefinitions.push_back(Var); 6098 return; 6099 } 6100 6101 // Provide a specific diagnostic for uninitialized variable 6102 // definitions with incomplete array type. 6103 if (Type->isIncompleteArrayType()) { 6104 Diag(Var->getLocation(), 6105 diag::err_typecheck_incomplete_array_needs_initializer); 6106 Var->setInvalidDecl(); 6107 return; 6108 } 6109 6110 // Provide a specific diagnostic for uninitialized variable 6111 // definitions with reference type. 6112 if (Type->isReferenceType()) { 6113 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 6114 << Var->getDeclName() 6115 << SourceRange(Var->getLocation(), Var->getLocation()); 6116 Var->setInvalidDecl(); 6117 return; 6118 } 6119 6120 // Do not attempt to type-check the default initializer for a 6121 // variable with dependent type. 6122 if (Type->isDependentType()) 6123 return; 6124 6125 if (Var->isInvalidDecl()) 6126 return; 6127 6128 if (RequireCompleteType(Var->getLocation(), 6129 Context.getBaseElementType(Type), 6130 diag::err_typecheck_decl_incomplete_type)) { 6131 Var->setInvalidDecl(); 6132 return; 6133 } 6134 6135 // The variable can not have an abstract class type. 6136 if (RequireNonAbstractType(Var->getLocation(), Type, 6137 diag::err_abstract_type_in_decl, 6138 AbstractVariableType)) { 6139 Var->setInvalidDecl(); 6140 return; 6141 } 6142 6143 // Check for jumps past the implicit initializer. C++0x 6144 // clarifies that this applies to a "variable with automatic 6145 // storage duration", not a "local variable". 6146 // C++0x [stmt.dcl]p3 6147 // A program that jumps from a point where a variable with automatic 6148 // storage duration is not in scope to a point where it is in scope is 6149 // ill-formed unless the variable has scalar type, class type with a 6150 // trivial default constructor and a trivial destructor, a cv-qualified 6151 // version of one of these types, or an array of one of the preceding 6152 // types and is declared without an initializer. 6153 if (getLangOptions().CPlusPlus && Var->hasLocalStorage()) { 6154 if (const RecordType *Record 6155 = Context.getBaseElementType(Type)->getAs<RecordType>()) { 6156 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record->getDecl()); 6157 if ((!getLangOptions().CPlusPlus0x && !CXXRecord->isPOD()) || 6158 (getLangOptions().CPlusPlus0x && 6159 (!CXXRecord->hasTrivialDefaultConstructor() || 6160 !CXXRecord->hasTrivialDestructor()))) 6161 getCurFunction()->setHasBranchProtectedScope(); 6162 } 6163 } 6164 6165 // C++03 [dcl.init]p9: 6166 // If no initializer is specified for an object, and the 6167 // object is of (possibly cv-qualified) non-POD class type (or 6168 // array thereof), the object shall be default-initialized; if 6169 // the object is of const-qualified type, the underlying class 6170 // type shall have a user-declared default 6171 // constructor. Otherwise, if no initializer is specified for 6172 // a non- static object, the object and its subobjects, if 6173 // any, have an indeterminate initial value); if the object 6174 // or any of its subobjects are of const-qualified type, the 6175 // program is ill-formed. 6176 // C++0x [dcl.init]p11: 6177 // If no initializer is specified for an object, the object is 6178 // default-initialized; [...]. 6179 InitializedEntity Entity = InitializedEntity::InitializeVariable(Var); 6180 InitializationKind Kind 6181 = InitializationKind::CreateDefault(Var->getLocation()); 6182 6183 InitializationSequence InitSeq(*this, Entity, Kind, 0, 0); 6184 ExprResult Init = InitSeq.Perform(*this, Entity, Kind, 6185 MultiExprArg(*this, 0, 0)); 6186 if (Init.isInvalid()) 6187 Var->setInvalidDecl(); 6188 else if (Init.get()) 6189 Var->setInit(MaybeCreateExprWithCleanups(Init.get())); 6190 6191 CheckCompleteVariableDeclaration(Var); 6192 } 6193} 6194 6195void Sema::ActOnCXXForRangeDecl(Decl *D) { 6196 VarDecl *VD = dyn_cast<VarDecl>(D); 6197 if (!VD) { 6198 Diag(D->getLocation(), diag::err_for_range_decl_must_be_var); 6199 D->setInvalidDecl(); 6200 return; 6201 } 6202 6203 VD->setCXXForRangeDecl(true); 6204 6205 // for-range-declaration cannot be given a storage class specifier. 6206 int Error = -1; 6207 switch (VD->getStorageClassAsWritten()) { 6208 case SC_None: 6209 break; 6210 case SC_Extern: 6211 Error = 0; 6212 break; 6213 case SC_Static: 6214 Error = 1; 6215 break; 6216 case SC_PrivateExtern: 6217 Error = 2; 6218 break; 6219 case SC_Auto: 6220 Error = 3; 6221 break; 6222 case SC_Register: 6223 Error = 4; 6224 break; 6225 case SC_OpenCLWorkGroupLocal: 6226 llvm_unreachable("Unexpected storage class"); 6227 } 6228 if (VD->isConstexpr()) 6229 Error = 5; 6230 if (Error != -1) { 6231 Diag(VD->getOuterLocStart(), diag::err_for_range_storage_class) 6232 << VD->getDeclName() << Error; 6233 D->setInvalidDecl(); 6234 } 6235} 6236 6237void Sema::CheckCompleteVariableDeclaration(VarDecl *var) { 6238 if (var->isInvalidDecl()) return; 6239 6240 // In ARC, don't allow jumps past the implicit initialization of a 6241 // local retaining variable. 6242 if (getLangOptions().ObjCAutoRefCount && 6243 var->hasLocalStorage()) { 6244 switch (var->getType().getObjCLifetime()) { 6245 case Qualifiers::OCL_None: 6246 case Qualifiers::OCL_ExplicitNone: 6247 case Qualifiers::OCL_Autoreleasing: 6248 break; 6249 6250 case Qualifiers::OCL_Weak: 6251 case Qualifiers::OCL_Strong: 6252 getCurFunction()->setHasBranchProtectedScope(); 6253 break; 6254 } 6255 } 6256 6257 // All the following checks are C++ only. 6258 if (!getLangOptions().CPlusPlus) return; 6259 6260 QualType baseType = Context.getBaseElementType(var->getType()); 6261 if (baseType->isDependentType()) return; 6262 6263 // __block variables might require us to capture a copy-initializer. 6264 if (var->hasAttr<BlocksAttr>()) { 6265 // It's currently invalid to ever have a __block variable with an 6266 // array type; should we diagnose that here? 6267 6268 // Regardless, we don't want to ignore array nesting when 6269 // constructing this copy. 6270 QualType type = var->getType(); 6271 6272 if (type->isStructureOrClassType()) { 6273 SourceLocation poi = var->getLocation(); 6274 Expr *varRef = new (Context) DeclRefExpr(var, type, VK_LValue, poi); 6275 ExprResult result = 6276 PerformCopyInitialization( 6277 InitializedEntity::InitializeBlock(poi, type, false), 6278 poi, Owned(varRef)); 6279 if (!result.isInvalid()) { 6280 result = MaybeCreateExprWithCleanups(result); 6281 Expr *init = result.takeAs<Expr>(); 6282 Context.setBlockVarCopyInits(var, init); 6283 } 6284 } 6285 } 6286 6287 // Check for global constructors. 6288 if (!var->getDeclContext()->isDependentContext() && 6289 var->hasGlobalStorage() && 6290 !var->isStaticLocal() && 6291 var->getInit() && 6292 !var->getInit()->isConstantInitializer(Context, 6293 baseType->isReferenceType())) 6294 Diag(var->getLocation(), diag::warn_global_constructor) 6295 << var->getInit()->getSourceRange(); 6296 6297 // Require the destructor. 6298 if (const RecordType *recordType = baseType->getAs<RecordType>()) 6299 FinalizeVarWithDestructor(var, recordType); 6300} 6301 6302/// FinalizeDeclaration - called by ParseDeclarationAfterDeclarator to perform 6303/// any semantic actions necessary after any initializer has been attached. 6304void 6305Sema::FinalizeDeclaration(Decl *ThisDecl) { 6306 // Note that we are no longer parsing the initializer for this declaration. 6307 ParsingInitForAutoVars.erase(ThisDecl); 6308} 6309 6310Sema::DeclGroupPtrTy 6311Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, 6312 Decl **Group, unsigned NumDecls) { 6313 SmallVector<Decl*, 8> Decls; 6314 6315 if (DS.isTypeSpecOwned()) 6316 Decls.push_back(DS.getRepAsDecl()); 6317 6318 for (unsigned i = 0; i != NumDecls; ++i) 6319 if (Decl *D = Group[i]) 6320 Decls.push_back(D); 6321 6322 return BuildDeclaratorGroup(Decls.data(), Decls.size(), 6323 DS.getTypeSpecType() == DeclSpec::TST_auto); 6324} 6325 6326/// BuildDeclaratorGroup - convert a list of declarations into a declaration 6327/// group, performing any necessary semantic checking. 6328Sema::DeclGroupPtrTy 6329Sema::BuildDeclaratorGroup(Decl **Group, unsigned NumDecls, 6330 bool TypeMayContainAuto) { 6331 // C++0x [dcl.spec.auto]p7: 6332 // If the type deduced for the template parameter U is not the same in each 6333 // deduction, the program is ill-formed. 6334 // FIXME: When initializer-list support is added, a distinction is needed 6335 // between the deduced type U and the deduced type which 'auto' stands for. 6336 // auto a = 0, b = { 1, 2, 3 }; 6337 // is legal because the deduced type U is 'int' in both cases. 6338 if (TypeMayContainAuto && NumDecls > 1) { 6339 QualType Deduced; 6340 CanQualType DeducedCanon; 6341 VarDecl *DeducedDecl = 0; 6342 for (unsigned i = 0; i != NumDecls; ++i) { 6343 if (VarDecl *D = dyn_cast<VarDecl>(Group[i])) { 6344 AutoType *AT = D->getType()->getContainedAutoType(); 6345 // Don't reissue diagnostics when instantiating a template. 6346 if (AT && D->isInvalidDecl()) 6347 break; 6348 if (AT && AT->isDeduced()) { 6349 QualType U = AT->getDeducedType(); 6350 CanQualType UCanon = Context.getCanonicalType(U); 6351 if (Deduced.isNull()) { 6352 Deduced = U; 6353 DeducedCanon = UCanon; 6354 DeducedDecl = D; 6355 } else if (DeducedCanon != UCanon) { 6356 Diag(D->getTypeSourceInfo()->getTypeLoc().getBeginLoc(), 6357 diag::err_auto_different_deductions) 6358 << Deduced << DeducedDecl->getDeclName() 6359 << U << D->getDeclName() 6360 << DeducedDecl->getInit()->getSourceRange() 6361 << D->getInit()->getSourceRange(); 6362 D->setInvalidDecl(); 6363 break; 6364 } 6365 } 6366 } 6367 } 6368 } 6369 6370 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, NumDecls)); 6371} 6372 6373 6374/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 6375/// to introduce parameters into function prototype scope. 6376Decl *Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 6377 const DeclSpec &DS = D.getDeclSpec(); 6378 6379 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 6380 VarDecl::StorageClass StorageClass = SC_None; 6381 VarDecl::StorageClass StorageClassAsWritten = SC_None; 6382 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 6383 StorageClass = SC_Register; 6384 StorageClassAsWritten = SC_Register; 6385 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 6386 Diag(DS.getStorageClassSpecLoc(), 6387 diag::err_invalid_storage_class_in_func_decl); 6388 D.getMutableDeclSpec().ClearStorageClassSpecs(); 6389 } 6390 6391 if (D.getDeclSpec().isThreadSpecified()) 6392 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 6393 if (D.getDeclSpec().isConstexprSpecified()) 6394 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 6395 << 0; 6396 6397 DiagnoseFunctionSpecifiers(D); 6398 6399 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6400 QualType parmDeclType = TInfo->getType(); 6401 6402 if (getLangOptions().CPlusPlus) { 6403 // Check that there are no default arguments inside the type of this 6404 // parameter. 6405 CheckExtraCXXDefaultArguments(D); 6406 6407 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 6408 if (D.getCXXScopeSpec().isSet()) { 6409 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 6410 << D.getCXXScopeSpec().getRange(); 6411 D.getCXXScopeSpec().clear(); 6412 } 6413 } 6414 6415 // Ensure we have a valid name 6416 IdentifierInfo *II = 0; 6417 if (D.hasName()) { 6418 II = D.getIdentifier(); 6419 if (!II) { 6420 Diag(D.getIdentifierLoc(), diag::err_bad_parameter_name) 6421 << GetNameForDeclarator(D).getName().getAsString(); 6422 D.setInvalidType(true); 6423 } 6424 } 6425 6426 // Check for redeclaration of parameters, e.g. int foo(int x, int x); 6427 if (II) { 6428 LookupResult R(*this, II, D.getIdentifierLoc(), LookupOrdinaryName, 6429 ForRedeclaration); 6430 LookupName(R, S); 6431 if (R.isSingleResult()) { 6432 NamedDecl *PrevDecl = R.getFoundDecl(); 6433 if (PrevDecl->isTemplateParameter()) { 6434 // Maybe we will complain about the shadowed template parameter. 6435 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 6436 // Just pretend that we didn't see the previous declaration. 6437 PrevDecl = 0; 6438 } else if (S->isDeclScope(PrevDecl)) { 6439 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 6440 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 6441 6442 // Recover by removing the name 6443 II = 0; 6444 D.SetIdentifier(0, D.getIdentifierLoc()); 6445 D.setInvalidType(true); 6446 } 6447 } 6448 } 6449 6450 // Temporarily put parameter variables in the translation unit, not 6451 // the enclosing context. This prevents them from accidentally 6452 // looking like class members in C++. 6453 ParmVarDecl *New = CheckParameter(Context.getTranslationUnitDecl(), 6454 D.getSourceRange().getBegin(), 6455 D.getIdentifierLoc(), II, 6456 parmDeclType, TInfo, 6457 StorageClass, StorageClassAsWritten); 6458 6459 if (D.isInvalidType()) 6460 New->setInvalidDecl(); 6461 6462 assert(S->isFunctionPrototypeScope()); 6463 assert(S->getFunctionPrototypeDepth() >= 1); 6464 New->setScopeInfo(S->getFunctionPrototypeDepth() - 1, 6465 S->getNextFunctionPrototypeIndex()); 6466 6467 // Add the parameter declaration into this scope. 6468 S->AddDecl(New); 6469 if (II) 6470 IdResolver.AddDecl(New); 6471 6472 ProcessDeclAttributes(S, New, D); 6473 6474 if (D.getDeclSpec().isModulePrivateSpecified()) 6475 Diag(New->getLocation(), diag::err_module_private_local) 6476 << 1 << New->getDeclName() 6477 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 6478 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 6479 6480 if (New->hasAttr<BlocksAttr>()) { 6481 Diag(New->getLocation(), diag::err_block_on_nonlocal); 6482 } 6483 return New; 6484} 6485 6486/// \brief Synthesizes a variable for a parameter arising from a 6487/// typedef. 6488ParmVarDecl *Sema::BuildParmVarDeclForTypedef(DeclContext *DC, 6489 SourceLocation Loc, 6490 QualType T) { 6491 /* FIXME: setting StartLoc == Loc. 6492 Would it be worth to modify callers so as to provide proper source 6493 location for the unnamed parameters, embedding the parameter's type? */ 6494 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, Loc, Loc, 0, 6495 T, Context.getTrivialTypeSourceInfo(T, Loc), 6496 SC_None, SC_None, 0); 6497 Param->setImplicit(); 6498 return Param; 6499} 6500 6501void Sema::DiagnoseUnusedParameters(ParmVarDecl * const *Param, 6502 ParmVarDecl * const *ParamEnd) { 6503 // Don't diagnose unused-parameter errors in template instantiations; we 6504 // will already have done so in the template itself. 6505 if (!ActiveTemplateInstantiations.empty()) 6506 return; 6507 6508 for (; Param != ParamEnd; ++Param) { 6509 if (!(*Param)->isUsed() && (*Param)->getDeclName() && 6510 !(*Param)->hasAttr<UnusedAttr>()) { 6511 Diag((*Param)->getLocation(), diag::warn_unused_parameter) 6512 << (*Param)->getDeclName(); 6513 } 6514 } 6515} 6516 6517void Sema::DiagnoseSizeOfParametersAndReturnValue(ParmVarDecl * const *Param, 6518 ParmVarDecl * const *ParamEnd, 6519 QualType ReturnTy, 6520 NamedDecl *D) { 6521 if (LangOpts.NumLargeByValueCopy == 0) // No check. 6522 return; 6523 6524 // Warn if the return value is pass-by-value and larger than the specified 6525 // threshold. 6526 if (ReturnTy.isPODType(Context)) { 6527 unsigned Size = Context.getTypeSizeInChars(ReturnTy).getQuantity(); 6528 if (Size > LangOpts.NumLargeByValueCopy) 6529 Diag(D->getLocation(), diag::warn_return_value_size) 6530 << D->getDeclName() << Size; 6531 } 6532 6533 // Warn if any parameter is pass-by-value and larger than the specified 6534 // threshold. 6535 for (; Param != ParamEnd; ++Param) { 6536 QualType T = (*Param)->getType(); 6537 if (!T.isPODType(Context)) 6538 continue; 6539 unsigned Size = Context.getTypeSizeInChars(T).getQuantity(); 6540 if (Size > LangOpts.NumLargeByValueCopy) 6541 Diag((*Param)->getLocation(), diag::warn_parameter_size) 6542 << (*Param)->getDeclName() << Size; 6543 } 6544} 6545 6546ParmVarDecl *Sema::CheckParameter(DeclContext *DC, SourceLocation StartLoc, 6547 SourceLocation NameLoc, IdentifierInfo *Name, 6548 QualType T, TypeSourceInfo *TSInfo, 6549 VarDecl::StorageClass StorageClass, 6550 VarDecl::StorageClass StorageClassAsWritten) { 6551 // In ARC, infer a lifetime qualifier for appropriate parameter types. 6552 if (getLangOptions().ObjCAutoRefCount && 6553 T.getObjCLifetime() == Qualifiers::OCL_None && 6554 T->isObjCLifetimeType()) { 6555 6556 Qualifiers::ObjCLifetime lifetime; 6557 6558 // Special cases for arrays: 6559 // - if it's const, use __unsafe_unretained 6560 // - otherwise, it's an error 6561 if (T->isArrayType()) { 6562 if (!T.isConstQualified()) { 6563 Diag(NameLoc, diag::err_arc_array_param_no_ownership) 6564 << TSInfo->getTypeLoc().getSourceRange(); 6565 } 6566 lifetime = Qualifiers::OCL_ExplicitNone; 6567 } else { 6568 lifetime = T->getObjCARCImplicitLifetime(); 6569 } 6570 T = Context.getLifetimeQualifiedType(T, lifetime); 6571 } 6572 6573 ParmVarDecl *New = ParmVarDecl::Create(Context, DC, StartLoc, NameLoc, Name, 6574 Context.getAdjustedParameterType(T), 6575 TSInfo, 6576 StorageClass, StorageClassAsWritten, 6577 0); 6578 6579 // Parameters can not be abstract class types. 6580 // For record types, this is done by the AbstractClassUsageDiagnoser once 6581 // the class has been completely parsed. 6582 if (!CurContext->isRecord() && 6583 RequireNonAbstractType(NameLoc, T, diag::err_abstract_type_in_decl, 6584 AbstractParamType)) 6585 New->setInvalidDecl(); 6586 6587 // Parameter declarators cannot be interface types. All ObjC objects are 6588 // passed by reference. 6589 if (T->isObjCObjectType()) { 6590 Diag(NameLoc, 6591 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T 6592 << FixItHint::CreateInsertion(NameLoc, "*"); 6593 T = Context.getObjCObjectPointerType(T); 6594 New->setType(T); 6595 } 6596 6597 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage 6598 // duration shall not be qualified by an address-space qualifier." 6599 // Since all parameters have automatic store duration, they can not have 6600 // an address space. 6601 if (T.getAddressSpace() != 0) { 6602 Diag(NameLoc, diag::err_arg_with_address_space); 6603 New->setInvalidDecl(); 6604 } 6605 6606 return New; 6607} 6608 6609void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 6610 SourceLocation LocAfterDecls) { 6611 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 6612 6613 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 6614 // for a K&R function. 6615 if (!FTI.hasPrototype) { 6616 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 6617 --i; 6618 if (FTI.ArgInfo[i].Param == 0) { 6619 llvm::SmallString<256> Code; 6620 llvm::raw_svector_ostream(Code) << " int " 6621 << FTI.ArgInfo[i].Ident->getName() 6622 << ";\n"; 6623 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 6624 << FTI.ArgInfo[i].Ident 6625 << FixItHint::CreateInsertion(LocAfterDecls, Code.str()); 6626 6627 // Implicitly declare the argument as type 'int' for lack of a better 6628 // type. 6629 AttributeFactory attrs; 6630 DeclSpec DS(attrs); 6631 const char* PrevSpec; // unused 6632 unsigned DiagID; // unused 6633 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 6634 PrevSpec, DiagID); 6635 Declarator ParamD(DS, Declarator::KNRTypeListContext); 6636 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 6637 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 6638 } 6639 } 6640 } 6641} 6642 6643Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, 6644 Declarator &D) { 6645 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 6646 assert(D.isFunctionDeclarator() && "Not a function declarator!"); 6647 Scope *ParentScope = FnBodyScope->getParent(); 6648 6649 Decl *DP = HandleDeclarator(ParentScope, D, 6650 MultiTemplateParamsArg(*this), 6651 /*IsFunctionDefinition=*/true); 6652 return ActOnStartOfFunctionDef(FnBodyScope, DP); 6653} 6654 6655static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD) { 6656 // Don't warn about invalid declarations. 6657 if (FD->isInvalidDecl()) 6658 return false; 6659 6660 // Or declarations that aren't global. 6661 if (!FD->isGlobal()) 6662 return false; 6663 6664 // Don't warn about C++ member functions. 6665 if (isa<CXXMethodDecl>(FD)) 6666 return false; 6667 6668 // Don't warn about 'main'. 6669 if (FD->isMain()) 6670 return false; 6671 6672 // Don't warn about inline functions. 6673 if (FD->isInlined()) 6674 return false; 6675 6676 // Don't warn about function templates. 6677 if (FD->getDescribedFunctionTemplate()) 6678 return false; 6679 6680 // Don't warn about function template specializations. 6681 if (FD->isFunctionTemplateSpecialization()) 6682 return false; 6683 6684 bool MissingPrototype = true; 6685 for (const FunctionDecl *Prev = FD->getPreviousDeclaration(); 6686 Prev; Prev = Prev->getPreviousDeclaration()) { 6687 // Ignore any declarations that occur in function or method 6688 // scope, because they aren't visible from the header. 6689 if (Prev->getDeclContext()->isFunctionOrMethod()) 6690 continue; 6691 6692 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 6693 break; 6694 } 6695 6696 return MissingPrototype; 6697} 6698 6699void Sema::CheckForFunctionRedefinition(FunctionDecl *FD) { 6700 // Don't complain if we're in GNU89 mode and the previous definition 6701 // was an extern inline function. 6702 const FunctionDecl *Definition; 6703 if (FD->isDefined(Definition) && 6704 !canRedefineFunction(Definition, getLangOptions())) { 6705 if (getLangOptions().GNUMode && Definition->isInlineSpecified() && 6706 Definition->getStorageClass() == SC_Extern) 6707 Diag(FD->getLocation(), diag::err_redefinition_extern_inline) 6708 << FD->getDeclName() << getLangOptions().CPlusPlus; 6709 else 6710 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 6711 Diag(Definition->getLocation(), diag::note_previous_definition); 6712 } 6713} 6714 6715Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Decl *D) { 6716 // Clear the last template instantiation error context. 6717 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation(); 6718 6719 if (!D) 6720 return D; 6721 FunctionDecl *FD = 0; 6722 6723 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(D)) 6724 FD = FunTmpl->getTemplatedDecl(); 6725 else 6726 FD = cast<FunctionDecl>(D); 6727 6728 // Enter a new function scope 6729 PushFunctionScope(); 6730 6731 // See if this is a redefinition. 6732 if (!FD->isLateTemplateParsed()) 6733 CheckForFunctionRedefinition(FD); 6734 6735 // Builtin functions cannot be defined. 6736 if (unsigned BuiltinID = FD->getBuiltinID()) { 6737 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 6738 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 6739 FD->setInvalidDecl(); 6740 } 6741 } 6742 6743 // The return type of a function definition must be complete 6744 // (C99 6.9.1p3, C++ [dcl.fct]p6). 6745 QualType ResultType = FD->getResultType(); 6746 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 6747 !FD->isInvalidDecl() && 6748 RequireCompleteType(FD->getLocation(), ResultType, 6749 diag::err_func_def_incomplete_result)) 6750 FD->setInvalidDecl(); 6751 6752 // GNU warning -Wmissing-prototypes: 6753 // Warn if a global function is defined without a previous 6754 // prototype declaration. This warning is issued even if the 6755 // definition itself provides a prototype. The aim is to detect 6756 // global functions that fail to be declared in header files. 6757 if (ShouldWarnAboutMissingPrototype(FD)) 6758 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 6759 6760 if (FnBodyScope) 6761 PushDeclContext(FnBodyScope, FD); 6762 6763 // Check the validity of our function parameters 6764 CheckParmsForFunctionDef(FD->param_begin(), FD->param_end(), 6765 /*CheckParameterNames=*/true); 6766 6767 // Introduce our parameters into the function scope 6768 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 6769 ParmVarDecl *Param = FD->getParamDecl(p); 6770 Param->setOwningFunction(FD); 6771 6772 // If this has an identifier, add it to the scope stack. 6773 if (Param->getIdentifier() && FnBodyScope) { 6774 CheckShadow(FnBodyScope, Param); 6775 6776 PushOnScopeChains(Param, FnBodyScope); 6777 } 6778 } 6779 6780 // Checking attributes of current function definition 6781 // dllimport attribute. 6782 DLLImportAttr *DA = FD->getAttr<DLLImportAttr>(); 6783 if (DA && (!FD->getAttr<DLLExportAttr>())) { 6784 // dllimport attribute cannot be directly applied to definition. 6785 // Microsoft accepts dllimport for functions defined within class scope. 6786 if (!DA->isInherited() && 6787 !(LangOpts.MicrosoftExt && FD->getLexicalDeclContext()->isRecord())) { 6788 Diag(FD->getLocation(), 6789 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 6790 << "dllimport"; 6791 FD->setInvalidDecl(); 6792 return FD; 6793 } 6794 6795 // Visual C++ appears to not think this is an issue, so only issue 6796 // a warning when Microsoft extensions are disabled. 6797 if (!LangOpts.MicrosoftExt) { 6798 // If a symbol previously declared dllimport is later defined, the 6799 // attribute is ignored in subsequent references, and a warning is 6800 // emitted. 6801 Diag(FD->getLocation(), 6802 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 6803 << FD->getName() << "dllimport"; 6804 } 6805 } 6806 return FD; 6807} 6808 6809/// \brief Given the set of return statements within a function body, 6810/// compute the variables that are subject to the named return value 6811/// optimization. 6812/// 6813/// Each of the variables that is subject to the named return value 6814/// optimization will be marked as NRVO variables in the AST, and any 6815/// return statement that has a marked NRVO variable as its NRVO candidate can 6816/// use the named return value optimization. 6817/// 6818/// This function applies a very simplistic algorithm for NRVO: if every return 6819/// statement in the function has the same NRVO candidate, that candidate is 6820/// the NRVO variable. 6821/// 6822/// FIXME: Employ a smarter algorithm that accounts for multiple return 6823/// statements and the lifetimes of the NRVO candidates. We should be able to 6824/// find a maximal set of NRVO variables. 6825void Sema::computeNRVO(Stmt *Body, FunctionScopeInfo *Scope) { 6826 ReturnStmt **Returns = Scope->Returns.data(); 6827 6828 const VarDecl *NRVOCandidate = 0; 6829 for (unsigned I = 0, E = Scope->Returns.size(); I != E; ++I) { 6830 if (!Returns[I]->getNRVOCandidate()) 6831 return; 6832 6833 if (!NRVOCandidate) 6834 NRVOCandidate = Returns[I]->getNRVOCandidate(); 6835 else if (NRVOCandidate != Returns[I]->getNRVOCandidate()) 6836 return; 6837 } 6838 6839 if (NRVOCandidate) 6840 const_cast<VarDecl*>(NRVOCandidate)->setNRVOVariable(true); 6841} 6842 6843Decl *Sema::ActOnFinishFunctionBody(Decl *D, Stmt *BodyArg) { 6844 return ActOnFinishFunctionBody(D, move(BodyArg), false); 6845} 6846 6847Decl *Sema::ActOnFinishFunctionBody(Decl *dcl, Stmt *Body, 6848 bool IsInstantiation) { 6849 FunctionDecl *FD = 0; 6850 FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl); 6851 if (FunTmpl) 6852 FD = FunTmpl->getTemplatedDecl(); 6853 else 6854 FD = dyn_cast_or_null<FunctionDecl>(dcl); 6855 6856 sema::AnalysisBasedWarnings::Policy WP = AnalysisWarnings.getDefaultPolicy(); 6857 sema::AnalysisBasedWarnings::Policy *ActivePolicy = 0; 6858 6859 if (FD) { 6860 FD->setBody(Body); 6861 if (FD->isMain()) { 6862 // C and C++ allow for main to automagically return 0. 6863 // Implements C++ [basic.start.main]p5 and C99 5.1.2.2.3. 6864 FD->setHasImplicitReturnZero(true); 6865 WP.disableCheckFallThrough(); 6866 } else if (FD->hasAttr<NakedAttr>()) { 6867 // If the function is marked 'naked', don't complain about missing return 6868 // statements. 6869 WP.disableCheckFallThrough(); 6870 } 6871 6872 // MSVC permits the use of pure specifier (=0) on function definition, 6873 // defined at class scope, warn about this non standard construct. 6874 if (getLangOptions().MicrosoftExt && FD->isPure()) 6875 Diag(FD->getLocation(), diag::warn_pure_function_definition); 6876 6877 if (!FD->isInvalidDecl()) { 6878 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end()); 6879 DiagnoseSizeOfParametersAndReturnValue(FD->param_begin(), FD->param_end(), 6880 FD->getResultType(), FD); 6881 6882 // If this is a constructor, we need a vtable. 6883 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(FD)) 6884 MarkVTableUsed(FD->getLocation(), Constructor->getParent()); 6885 6886 computeNRVO(Body, getCurFunction()); 6887 } 6888 6889 assert(FD == getCurFunctionDecl() && "Function parsing confused"); 6890 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 6891 assert(MD == getCurMethodDecl() && "Method parsing confused"); 6892 MD->setBody(Body); 6893 if (Body) 6894 MD->setEndLoc(Body->getLocEnd()); 6895 if (!MD->isInvalidDecl()) { 6896 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end()); 6897 DiagnoseSizeOfParametersAndReturnValue(MD->param_begin(), MD->param_end(), 6898 MD->getResultType(), MD); 6899 6900 if (Body) 6901 computeNRVO(Body, getCurFunction()); 6902 } 6903 if (ObjCShouldCallSuperDealloc) { 6904 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_dealloc); 6905 ObjCShouldCallSuperDealloc = false; 6906 } 6907 if (ObjCShouldCallSuperFinalize) { 6908 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_finalize); 6909 ObjCShouldCallSuperFinalize = false; 6910 } 6911 } else { 6912 return 0; 6913 } 6914 6915 assert(!ObjCShouldCallSuperDealloc && "This should only be set for " 6916 "ObjC methods, which should have been handled in the block above."); 6917 assert(!ObjCShouldCallSuperFinalize && "This should only be set for " 6918 "ObjC methods, which should have been handled in the block above."); 6919 6920 // Verify and clean out per-function state. 6921 if (Body) { 6922 // C++ constructors that have function-try-blocks can't have return 6923 // statements in the handlers of that block. (C++ [except.handle]p14) 6924 // Verify this. 6925 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body)) 6926 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); 6927 6928 // Verify that gotos and switch cases don't jump into scopes illegally. 6929 if (getCurFunction()->NeedsScopeChecking() && 6930 !dcl->isInvalidDecl() && 6931 !hasAnyUnrecoverableErrorsInThisFunction()) 6932 DiagnoseInvalidJumps(Body); 6933 6934 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) { 6935 if (!Destructor->getParent()->isDependentType()) 6936 CheckDestructor(Destructor); 6937 6938 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 6939 Destructor->getParent()); 6940 } 6941 6942 // If any errors have occurred, clear out any temporaries that may have 6943 // been leftover. This ensures that these temporaries won't be picked up for 6944 // deletion in some later function. 6945 if (PP.getDiagnostics().hasErrorOccurred() || 6946 PP.getDiagnostics().getSuppressAllDiagnostics()) { 6947 ExprTemporaries.clear(); 6948 ExprNeedsCleanups = false; 6949 } else if (!isa<FunctionTemplateDecl>(dcl)) { 6950 // Since the body is valid, issue any analysis-based warnings that are 6951 // enabled. 6952 ActivePolicy = &WP; 6953 } 6954 6955 assert(ExprTemporaries.empty() && "Leftover temporaries in function"); 6956 assert(!ExprNeedsCleanups && "Unaccounted cleanups in function"); 6957 } 6958 6959 if (!IsInstantiation) 6960 PopDeclContext(); 6961 6962 PopFunctionOrBlockScope(ActivePolicy, dcl); 6963 6964 // If any errors have occurred, clear out any temporaries that may have 6965 // been leftover. This ensures that these temporaries won't be picked up for 6966 // deletion in some later function. 6967 if (getDiagnostics().hasErrorOccurred()) { 6968 ExprTemporaries.clear(); 6969 ExprNeedsCleanups = false; 6970 } 6971 6972 return dcl; 6973} 6974 6975 6976/// When we finish delayed parsing of an attribute, we must attach it to the 6977/// relevant Decl. 6978void Sema::ActOnFinishDelayedAttribute(Scope *S, Decl *D, 6979 ParsedAttributes &Attrs) { 6980 ProcessDeclAttributeList(S, D, Attrs.getList()); 6981} 6982 6983 6984/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 6985/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 6986NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 6987 IdentifierInfo &II, Scope *S) { 6988 // Before we produce a declaration for an implicitly defined 6989 // function, see whether there was a locally-scoped declaration of 6990 // this name as a function or variable. If so, use that 6991 // (non-visible) declaration, and complain about it. 6992 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 6993 = findLocallyScopedExternalDecl(&II); 6994 if (Pos != LocallyScopedExternalDecls.end()) { 6995 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 6996 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 6997 return Pos->second; 6998 } 6999 7000 // Extension in C99. Legal in C90, but warn about it. 7001 if (II.getName().startswith("__builtin_")) 7002 Diag(Loc, diag::warn_builtin_unknown) << &II; 7003 else if (getLangOptions().C99) 7004 Diag(Loc, diag::ext_implicit_function_decl) << &II; 7005 else 7006 Diag(Loc, diag::warn_implicit_function_decl) << &II; 7007 7008 // Set a Declarator for the implicit definition: int foo(); 7009 const char *Dummy; 7010 AttributeFactory attrFactory; 7011 DeclSpec DS(attrFactory); 7012 unsigned DiagID; 7013 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID); 7014 (void)Error; // Silence warning. 7015 assert(!Error && "Error setting up implicit decl!"); 7016 Declarator D(DS, Declarator::BlockContext); 7017 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0, 7018 0, 0, true, SourceLocation(), 7019 SourceLocation(), 7020 EST_None, SourceLocation(), 7021 0, 0, 0, 0, Loc, Loc, D), 7022 DS.getAttributes(), 7023 SourceLocation()); 7024 D.SetIdentifier(&II, Loc); 7025 7026 // Insert this function into translation-unit scope. 7027 7028 DeclContext *PrevDC = CurContext; 7029 CurContext = Context.getTranslationUnitDecl(); 7030 7031 FunctionDecl *FD = dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D)); 7032 FD->setImplicit(); 7033 7034 CurContext = PrevDC; 7035 7036 AddKnownFunctionAttributes(FD); 7037 7038 return FD; 7039} 7040 7041/// \brief Adds any function attributes that we know a priori based on 7042/// the declaration of this function. 7043/// 7044/// These attributes can apply both to implicitly-declared builtins 7045/// (like __builtin___printf_chk) or to library-declared functions 7046/// like NSLog or printf. 7047/// 7048/// We need to check for duplicate attributes both here and where user-written 7049/// attributes are applied to declarations. 7050void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 7051 if (FD->isInvalidDecl()) 7052 return; 7053 7054 // If this is a built-in function, map its builtin attributes to 7055 // actual attributes. 7056 if (unsigned BuiltinID = FD->getBuiltinID()) { 7057 // Handle printf-formatting attributes. 7058 unsigned FormatIdx; 7059 bool HasVAListArg; 7060 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 7061 if (!FD->getAttr<FormatAttr>()) 7062 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7063 "printf", FormatIdx+1, 7064 HasVAListArg ? 0 : FormatIdx+2)); 7065 } 7066 if (Context.BuiltinInfo.isScanfLike(BuiltinID, FormatIdx, 7067 HasVAListArg)) { 7068 if (!FD->getAttr<FormatAttr>()) 7069 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7070 "scanf", FormatIdx+1, 7071 HasVAListArg ? 0 : FormatIdx+2)); 7072 } 7073 7074 // Mark const if we don't care about errno and that is the only 7075 // thing preventing the function from being const. This allows 7076 // IRgen to use LLVM intrinsics for such functions. 7077 if (!getLangOptions().MathErrno && 7078 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 7079 if (!FD->getAttr<ConstAttr>()) 7080 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 7081 } 7082 7083 if (Context.BuiltinInfo.isNoThrow(BuiltinID) && !FD->getAttr<NoThrowAttr>()) 7084 FD->addAttr(::new (Context) NoThrowAttr(FD->getLocation(), Context)); 7085 if (Context.BuiltinInfo.isConst(BuiltinID) && !FD->getAttr<ConstAttr>()) 7086 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 7087 } 7088 7089 IdentifierInfo *Name = FD->getIdentifier(); 7090 if (!Name) 7091 return; 7092 if ((!getLangOptions().CPlusPlus && 7093 FD->getDeclContext()->isTranslationUnit()) || 7094 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 7095 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 7096 LinkageSpecDecl::lang_c)) { 7097 // Okay: this could be a libc/libm/Objective-C function we know 7098 // about. 7099 } else 7100 return; 7101 7102 if (Name->isStr("NSLog") || Name->isStr("NSLogv")) { 7103 // FIXME: NSLog and NSLogv should be target specific 7104 if (const FormatAttr *Format = FD->getAttr<FormatAttr>()) { 7105 // FIXME: We known better than our headers. 7106 const_cast<FormatAttr *>(Format)->setType(Context, "printf"); 7107 } else 7108 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7109 "printf", 1, 7110 Name->isStr("NSLogv") ? 0 : 2)); 7111 } else if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { 7112 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be 7113 // target-specific builtins, perhaps? 7114 if (!FD->getAttr<FormatAttr>()) 7115 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7116 "printf", 2, 7117 Name->isStr("vasprintf") ? 0 : 3)); 7118 } 7119} 7120 7121TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 7122 TypeSourceInfo *TInfo) { 7123 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 7124 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 7125 7126 if (!TInfo) { 7127 assert(D.isInvalidType() && "no declarator info for valid type"); 7128 TInfo = Context.getTrivialTypeSourceInfo(T); 7129 } 7130 7131 // Scope manipulation handled by caller. 7132 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 7133 D.getSourceRange().getBegin(), 7134 D.getIdentifierLoc(), 7135 D.getIdentifier(), 7136 TInfo); 7137 7138 // Bail out immediately if we have an invalid declaration. 7139 if (D.isInvalidType()) { 7140 NewTD->setInvalidDecl(); 7141 return NewTD; 7142 } 7143 7144 if (D.getDeclSpec().isModulePrivateSpecified()) { 7145 if (CurContext->isFunctionOrMethod()) 7146 Diag(NewTD->getLocation(), diag::err_module_private_local) 7147 << 2 << NewTD->getDeclName() 7148 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 7149 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 7150 else 7151 NewTD->setModulePrivate(); 7152 } 7153 7154 // C++ [dcl.typedef]p8: 7155 // If the typedef declaration defines an unnamed class (or 7156 // enum), the first typedef-name declared by the declaration 7157 // to be that class type (or enum type) is used to denote the 7158 // class type (or enum type) for linkage purposes only. 7159 // We need to check whether the type was declared in the declaration. 7160 switch (D.getDeclSpec().getTypeSpecType()) { 7161 case TST_enum: 7162 case TST_struct: 7163 case TST_union: 7164 case TST_class: { 7165 TagDecl *tagFromDeclSpec = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 7166 7167 // Do nothing if the tag is not anonymous or already has an 7168 // associated typedef (from an earlier typedef in this decl group). 7169 if (tagFromDeclSpec->getIdentifier()) break; 7170 if (tagFromDeclSpec->getTypedefNameForAnonDecl()) break; 7171 7172 // A well-formed anonymous tag must always be a TUK_Definition. 7173 assert(tagFromDeclSpec->isThisDeclarationADefinition()); 7174 7175 // The type must match the tag exactly; no qualifiers allowed. 7176 if (!Context.hasSameType(T, Context.getTagDeclType(tagFromDeclSpec))) 7177 break; 7178 7179 // Otherwise, set this is the anon-decl typedef for the tag. 7180 tagFromDeclSpec->setTypedefNameForAnonDecl(NewTD); 7181 break; 7182 } 7183 7184 default: 7185 break; 7186 } 7187 7188 return NewTD; 7189} 7190 7191 7192/// \brief Determine whether a tag with a given kind is acceptable 7193/// as a redeclaration of the given tag declaration. 7194/// 7195/// \returns true if the new tag kind is acceptable, false otherwise. 7196bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, 7197 TagTypeKind NewTag, bool isDefinition, 7198 SourceLocation NewTagLoc, 7199 const IdentifierInfo &Name) { 7200 // C++ [dcl.type.elab]p3: 7201 // The class-key or enum keyword present in the 7202 // elaborated-type-specifier shall agree in kind with the 7203 // declaration to which the name in the elaborated-type-specifier 7204 // refers. This rule also applies to the form of 7205 // elaborated-type-specifier that declares a class-name or 7206 // friend class since it can be construed as referring to the 7207 // definition of the class. Thus, in any 7208 // elaborated-type-specifier, the enum keyword shall be used to 7209 // refer to an enumeration (7.2), the union class-key shall be 7210 // used to refer to a union (clause 9), and either the class or 7211 // struct class-key shall be used to refer to a class (clause 9) 7212 // declared using the class or struct class-key. 7213 TagTypeKind OldTag = Previous->getTagKind(); 7214 if (!isDefinition || (NewTag != TTK_Class && NewTag != TTK_Struct)) 7215 if (OldTag == NewTag) 7216 return true; 7217 7218 if ((OldTag == TTK_Struct || OldTag == TTK_Class) && 7219 (NewTag == TTK_Struct || NewTag == TTK_Class)) { 7220 // Warn about the struct/class tag mismatch. 7221 bool isTemplate = false; 7222 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) 7223 isTemplate = Record->getDescribedClassTemplate(); 7224 7225 if (!ActiveTemplateInstantiations.empty()) { 7226 // In a template instantiation, do not offer fix-its for tag mismatches 7227 // since they usually mess up the template instead of fixing the problem. 7228 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 7229 << (NewTag == TTK_Class) << isTemplate << &Name; 7230 return true; 7231 } 7232 7233 if (isDefinition) { 7234 // On definitions, check previous tags and issue a fix-it for each 7235 // one that doesn't match the current tag. 7236 if (Previous->getDefinition()) { 7237 // Don't suggest fix-its for redefinitions. 7238 return true; 7239 } 7240 7241 bool previousMismatch = false; 7242 for (TagDecl::redecl_iterator I(Previous->redecls_begin()), 7243 E(Previous->redecls_end()); I != E; ++I) { 7244 if (I->getTagKind() != NewTag) { 7245 if (!previousMismatch) { 7246 previousMismatch = true; 7247 Diag(NewTagLoc, diag::warn_struct_class_previous_tag_mismatch) 7248 << (NewTag == TTK_Class) << isTemplate << &Name; 7249 } 7250 Diag(I->getInnerLocStart(), diag::note_struct_class_suggestion) 7251 << (NewTag == TTK_Class) 7252 << FixItHint::CreateReplacement(I->getInnerLocStart(), 7253 NewTag == TTK_Class? 7254 "class" : "struct"); 7255 } 7256 } 7257 return true; 7258 } 7259 7260 // Check for a previous definition. If current tag and definition 7261 // are same type, do nothing. If no definition, but disagree with 7262 // with previous tag type, give a warning, but no fix-it. 7263 const TagDecl *Redecl = Previous->getDefinition() ? 7264 Previous->getDefinition() : Previous; 7265 if (Redecl->getTagKind() == NewTag) { 7266 return true; 7267 } 7268 7269 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 7270 << (NewTag == TTK_Class) 7271 << isTemplate << &Name; 7272 Diag(Redecl->getLocation(), diag::note_previous_use); 7273 7274 // If there is a previous defintion, suggest a fix-it. 7275 if (Previous->getDefinition()) { 7276 Diag(NewTagLoc, diag::note_struct_class_suggestion) 7277 << (Redecl->getTagKind() == TTK_Class) 7278 << FixItHint::CreateReplacement(SourceRange(NewTagLoc), 7279 Redecl->getTagKind() == TTK_Class? "class" : "struct"); 7280 } 7281 7282 return true; 7283 } 7284 return false; 7285} 7286 7287/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 7288/// former case, Name will be non-null. In the later case, Name will be null. 7289/// TagSpec indicates what kind of tag this is. TUK indicates whether this is a 7290/// reference/declaration/definition of a tag. 7291Decl *Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK, 7292 SourceLocation KWLoc, CXXScopeSpec &SS, 7293 IdentifierInfo *Name, SourceLocation NameLoc, 7294 AttributeList *Attr, AccessSpecifier AS, 7295 SourceLocation ModulePrivateLoc, 7296 MultiTemplateParamsArg TemplateParameterLists, 7297 bool &OwnedDecl, bool &IsDependent, 7298 bool ScopedEnum, bool ScopedEnumUsesClassTag, 7299 TypeResult UnderlyingType) { 7300 // If this is not a definition, it must have a name. 7301 assert((Name != 0 || TUK == TUK_Definition) && 7302 "Nameless record must be a definition!"); 7303 assert(TemplateParameterLists.size() == 0 || TUK != TUK_Reference); 7304 7305 OwnedDecl = false; 7306 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 7307 7308 // FIXME: Check explicit specializations more carefully. 7309 bool isExplicitSpecialization = false; 7310 bool Invalid = false; 7311 7312 // We only need to do this matching if we have template parameters 7313 // or a scope specifier, which also conveniently avoids this work 7314 // for non-C++ cases. 7315 if (TemplateParameterLists.size() > 0 || 7316 (SS.isNotEmpty() && TUK != TUK_Reference)) { 7317 if (TemplateParameterList *TemplateParams 7318 = MatchTemplateParametersToScopeSpecifier(KWLoc, NameLoc, SS, 7319 TemplateParameterLists.get(), 7320 TemplateParameterLists.size(), 7321 TUK == TUK_Friend, 7322 isExplicitSpecialization, 7323 Invalid)) { 7324 if (TemplateParams->size() > 0) { 7325 // This is a declaration or definition of a class template (which may 7326 // be a member of another template). 7327 7328 if (Invalid) 7329 return 0; 7330 7331 OwnedDecl = false; 7332 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc, 7333 SS, Name, NameLoc, Attr, 7334 TemplateParams, AS, 7335 ModulePrivateLoc, 7336 TemplateParameterLists.size() - 1, 7337 (TemplateParameterList**) TemplateParameterLists.release()); 7338 return Result.get(); 7339 } else { 7340 // The "template<>" header is extraneous. 7341 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 7342 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 7343 isExplicitSpecialization = true; 7344 } 7345 } 7346 } 7347 7348 // Figure out the underlying type if this a enum declaration. We need to do 7349 // this early, because it's needed to detect if this is an incompatible 7350 // redeclaration. 7351 llvm::PointerUnion<const Type*, TypeSourceInfo*> EnumUnderlying; 7352 7353 if (Kind == TTK_Enum) { 7354 if (UnderlyingType.isInvalid() || (!UnderlyingType.get() && ScopedEnum)) 7355 // No underlying type explicitly specified, or we failed to parse the 7356 // type, default to int. 7357 EnumUnderlying = Context.IntTy.getTypePtr(); 7358 else if (UnderlyingType.get()) { 7359 // C++0x 7.2p2: The type-specifier-seq of an enum-base shall name an 7360 // integral type; any cv-qualification is ignored. 7361 TypeSourceInfo *TI = 0; 7362 QualType T = GetTypeFromParser(UnderlyingType.get(), &TI); 7363 EnumUnderlying = TI; 7364 7365 SourceLocation UnderlyingLoc = TI->getTypeLoc().getBeginLoc(); 7366 7367 if (!T->isDependentType() && !T->isIntegralType(Context)) { 7368 Diag(UnderlyingLoc, diag::err_enum_invalid_underlying) 7369 << T; 7370 // Recover by falling back to int. 7371 EnumUnderlying = Context.IntTy.getTypePtr(); 7372 } 7373 7374 if (DiagnoseUnexpandedParameterPack(UnderlyingLoc, TI, 7375 UPPC_FixedUnderlyingType)) 7376 EnumUnderlying = Context.IntTy.getTypePtr(); 7377 7378 } else if (getLangOptions().MicrosoftExt) 7379 // Microsoft enums are always of int type. 7380 EnumUnderlying = Context.IntTy.getTypePtr(); 7381 } 7382 7383 DeclContext *SearchDC = CurContext; 7384 DeclContext *DC = CurContext; 7385 bool isStdBadAlloc = false; 7386 7387 RedeclarationKind Redecl = ForRedeclaration; 7388 if (TUK == TUK_Friend || TUK == TUK_Reference) 7389 Redecl = NotForRedeclaration; 7390 7391 LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl); 7392 7393 if (Name && SS.isNotEmpty()) { 7394 // We have a nested-name tag ('struct foo::bar'). 7395 7396 // Check for invalid 'foo::'. 7397 if (SS.isInvalid()) { 7398 Name = 0; 7399 goto CreateNewDecl; 7400 } 7401 7402 // If this is a friend or a reference to a class in a dependent 7403 // context, don't try to make a decl for it. 7404 if (TUK == TUK_Friend || TUK == TUK_Reference) { 7405 DC = computeDeclContext(SS, false); 7406 if (!DC) { 7407 IsDependent = true; 7408 return 0; 7409 } 7410 } else { 7411 DC = computeDeclContext(SS, true); 7412 if (!DC) { 7413 Diag(SS.getRange().getBegin(), diag::err_dependent_nested_name_spec) 7414 << SS.getRange(); 7415 return 0; 7416 } 7417 } 7418 7419 if (RequireCompleteDeclContext(SS, DC)) 7420 return 0; 7421 7422 SearchDC = DC; 7423 // Look-up name inside 'foo::'. 7424 LookupQualifiedName(Previous, DC); 7425 7426 if (Previous.isAmbiguous()) 7427 return 0; 7428 7429 if (Previous.empty()) { 7430 // Name lookup did not find anything. However, if the 7431 // nested-name-specifier refers to the current instantiation, 7432 // and that current instantiation has any dependent base 7433 // classes, we might find something at instantiation time: treat 7434 // this as a dependent elaborated-type-specifier. 7435 // But this only makes any sense for reference-like lookups. 7436 if (Previous.wasNotFoundInCurrentInstantiation() && 7437 (TUK == TUK_Reference || TUK == TUK_Friend)) { 7438 IsDependent = true; 7439 return 0; 7440 } 7441 7442 // A tag 'foo::bar' must already exist. 7443 Diag(NameLoc, diag::err_not_tag_in_scope) 7444 << Kind << Name << DC << SS.getRange(); 7445 Name = 0; 7446 Invalid = true; 7447 goto CreateNewDecl; 7448 } 7449 } else if (Name) { 7450 // If this is a named struct, check to see if there was a previous forward 7451 // declaration or definition. 7452 // FIXME: We're looking into outer scopes here, even when we 7453 // shouldn't be. Doing so can result in ambiguities that we 7454 // shouldn't be diagnosing. 7455 LookupName(Previous, S); 7456 7457 if (Previous.isAmbiguous() && 7458 (TUK == TUK_Definition || TUK == TUK_Declaration)) { 7459 LookupResult::Filter F = Previous.makeFilter(); 7460 while (F.hasNext()) { 7461 NamedDecl *ND = F.next(); 7462 if (ND->getDeclContext()->getRedeclContext() != SearchDC) 7463 F.erase(); 7464 } 7465 F.done(); 7466 } 7467 7468 // Note: there used to be some attempt at recovery here. 7469 if (Previous.isAmbiguous()) 7470 return 0; 7471 7472 if (!getLangOptions().CPlusPlus && TUK != TUK_Reference) { 7473 // FIXME: This makes sure that we ignore the contexts associated 7474 // with C structs, unions, and enums when looking for a matching 7475 // tag declaration or definition. See the similar lookup tweak 7476 // in Sema::LookupName; is there a better way to deal with this? 7477 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 7478 SearchDC = SearchDC->getParent(); 7479 } 7480 } else if (S->isFunctionPrototypeScope()) { 7481 // If this is an enum declaration in function prototype scope, set its 7482 // initial context to the translation unit. 7483 SearchDC = Context.getTranslationUnitDecl(); 7484 } 7485 7486 if (Previous.isSingleResult() && 7487 Previous.getFoundDecl()->isTemplateParameter()) { 7488 // Maybe we will complain about the shadowed template parameter. 7489 DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl()); 7490 // Just pretend that we didn't see the previous declaration. 7491 Previous.clear(); 7492 } 7493 7494 if (getLangOptions().CPlusPlus && Name && DC && StdNamespace && 7495 DC->Equals(getStdNamespace()) && Name->isStr("bad_alloc")) { 7496 // This is a declaration of or a reference to "std::bad_alloc". 7497 isStdBadAlloc = true; 7498 7499 if (Previous.empty() && StdBadAlloc) { 7500 // std::bad_alloc has been implicitly declared (but made invisible to 7501 // name lookup). Fill in this implicit declaration as the previous 7502 // declaration, so that the declarations get chained appropriately. 7503 Previous.addDecl(getStdBadAlloc()); 7504 } 7505 } 7506 7507 // If we didn't find a previous declaration, and this is a reference 7508 // (or friend reference), move to the correct scope. In C++, we 7509 // also need to do a redeclaration lookup there, just in case 7510 // there's a shadow friend decl. 7511 if (Name && Previous.empty() && 7512 (TUK == TUK_Reference || TUK == TUK_Friend)) { 7513 if (Invalid) goto CreateNewDecl; 7514 assert(SS.isEmpty()); 7515 7516 if (TUK == TUK_Reference) { 7517 // C++ [basic.scope.pdecl]p5: 7518 // -- for an elaborated-type-specifier of the form 7519 // 7520 // class-key identifier 7521 // 7522 // if the elaborated-type-specifier is used in the 7523 // decl-specifier-seq or parameter-declaration-clause of a 7524 // function defined in namespace scope, the identifier is 7525 // declared as a class-name in the namespace that contains 7526 // the declaration; otherwise, except as a friend 7527 // declaration, the identifier is declared in the smallest 7528 // non-class, non-function-prototype scope that contains the 7529 // declaration. 7530 // 7531 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 7532 // C structs and unions. 7533 // 7534 // It is an error in C++ to declare (rather than define) an enum 7535 // type, including via an elaborated type specifier. We'll 7536 // diagnose that later; for now, declare the enum in the same 7537 // scope as we would have picked for any other tag type. 7538 // 7539 // GNU C also supports this behavior as part of its incomplete 7540 // enum types extension, while GNU C++ does not. 7541 // 7542 // Find the context where we'll be declaring the tag. 7543 // FIXME: We would like to maintain the current DeclContext as the 7544 // lexical context, 7545 while (SearchDC->isRecord() || SearchDC->isTransparentContext()) 7546 SearchDC = SearchDC->getParent(); 7547 7548 // Find the scope where we'll be declaring the tag. 7549 while (S->isClassScope() || 7550 (getLangOptions().CPlusPlus && 7551 S->isFunctionPrototypeScope()) || 7552 ((S->getFlags() & Scope::DeclScope) == 0) || 7553 (S->getEntity() && 7554 ((DeclContext *)S->getEntity())->isTransparentContext())) 7555 S = S->getParent(); 7556 } else { 7557 assert(TUK == TUK_Friend); 7558 // C++ [namespace.memdef]p3: 7559 // If a friend declaration in a non-local class first declares a 7560 // class or function, the friend class or function is a member of 7561 // the innermost enclosing namespace. 7562 SearchDC = SearchDC->getEnclosingNamespaceContext(); 7563 } 7564 7565 // In C++, we need to do a redeclaration lookup to properly 7566 // diagnose some problems. 7567 if (getLangOptions().CPlusPlus) { 7568 Previous.setRedeclarationKind(ForRedeclaration); 7569 LookupQualifiedName(Previous, SearchDC); 7570 } 7571 } 7572 7573 if (!Previous.empty()) { 7574 NamedDecl *PrevDecl = (*Previous.begin())->getUnderlyingDecl(); 7575 7576 // It's okay to have a tag decl in the same scope as a typedef 7577 // which hides a tag decl in the same scope. Finding this 7578 // insanity with a redeclaration lookup can only actually happen 7579 // in C++. 7580 // 7581 // This is also okay for elaborated-type-specifiers, which is 7582 // technically forbidden by the current standard but which is 7583 // okay according to the likely resolution of an open issue; 7584 // see http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#407 7585 if (getLangOptions().CPlusPlus) { 7586 if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(PrevDecl)) { 7587 if (const TagType *TT = TD->getUnderlyingType()->getAs<TagType>()) { 7588 TagDecl *Tag = TT->getDecl(); 7589 if (Tag->getDeclName() == Name && 7590 Tag->getDeclContext()->getRedeclContext() 7591 ->Equals(TD->getDeclContext()->getRedeclContext())) { 7592 PrevDecl = Tag; 7593 Previous.clear(); 7594 Previous.addDecl(Tag); 7595 Previous.resolveKind(); 7596 } 7597 } 7598 } 7599 } 7600 7601 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 7602 // If this is a use of a previous tag, or if the tag is already declared 7603 // in the same scope (so that the definition/declaration completes or 7604 // rementions the tag), reuse the decl. 7605 if (TUK == TUK_Reference || TUK == TUK_Friend || 7606 isDeclInScope(PrevDecl, SearchDC, S, isExplicitSpecialization)) { 7607 // Make sure that this wasn't declared as an enum and now used as a 7608 // struct or something similar. 7609 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, 7610 TUK == TUK_Definition, KWLoc, 7611 *Name)) { 7612 bool SafeToContinue 7613 = (PrevTagDecl->getTagKind() != TTK_Enum && 7614 Kind != TTK_Enum); 7615 if (SafeToContinue) 7616 Diag(KWLoc, diag::err_use_with_wrong_tag) 7617 << Name 7618 << FixItHint::CreateReplacement(SourceRange(KWLoc), 7619 PrevTagDecl->getKindName()); 7620 else 7621 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 7622 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7623 7624 if (SafeToContinue) 7625 Kind = PrevTagDecl->getTagKind(); 7626 else { 7627 // Recover by making this an anonymous redefinition. 7628 Name = 0; 7629 Previous.clear(); 7630 Invalid = true; 7631 } 7632 } 7633 7634 if (Kind == TTK_Enum && PrevTagDecl->getTagKind() == TTK_Enum) { 7635 const EnumDecl *PrevEnum = cast<EnumDecl>(PrevTagDecl); 7636 7637 // All conflicts with previous declarations are recovered by 7638 // returning the previous declaration. 7639 if (ScopedEnum != PrevEnum->isScoped()) { 7640 Diag(KWLoc, diag::err_enum_redeclare_scoped_mismatch) 7641 << PrevEnum->isScoped(); 7642 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7643 return PrevTagDecl; 7644 } 7645 else if (EnumUnderlying && PrevEnum->isFixed()) { 7646 QualType T; 7647 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 7648 T = TI->getType(); 7649 else 7650 T = QualType(EnumUnderlying.get<const Type*>(), 0); 7651 7652 if (!Context.hasSameUnqualifiedType(T, PrevEnum->getIntegerType())) { 7653 Diag(NameLoc.isValid() ? NameLoc : KWLoc, 7654 diag::err_enum_redeclare_type_mismatch) 7655 << T 7656 << PrevEnum->getIntegerType(); 7657 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7658 return PrevTagDecl; 7659 } 7660 } 7661 else if (!EnumUnderlying.isNull() != PrevEnum->isFixed()) { 7662 Diag(KWLoc, diag::err_enum_redeclare_fixed_mismatch) 7663 << PrevEnum->isFixed(); 7664 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7665 return PrevTagDecl; 7666 } 7667 } 7668 7669 if (!Invalid) { 7670 // If this is a use, just return the declaration we found. 7671 7672 // FIXME: In the future, return a variant or some other clue 7673 // for the consumer of this Decl to know it doesn't own it. 7674 // For our current ASTs this shouldn't be a problem, but will 7675 // need to be changed with DeclGroups. 7676 if ((TUK == TUK_Reference && (!PrevTagDecl->getFriendObjectKind() || 7677 getLangOptions().MicrosoftExt)) || TUK == TUK_Friend) 7678 return PrevTagDecl; 7679 7680 // Diagnose attempts to redefine a tag. 7681 if (TUK == TUK_Definition) { 7682 if (TagDecl *Def = PrevTagDecl->getDefinition()) { 7683 // If we're defining a specialization and the previous definition 7684 // is from an implicit instantiation, don't emit an error 7685 // here; we'll catch this in the general case below. 7686 if (!isExplicitSpecialization || 7687 !isa<CXXRecordDecl>(Def) || 7688 cast<CXXRecordDecl>(Def)->getTemplateSpecializationKind() 7689 == TSK_ExplicitSpecialization) { 7690 Diag(NameLoc, diag::err_redefinition) << Name; 7691 Diag(Def->getLocation(), diag::note_previous_definition); 7692 // If this is a redefinition, recover by making this 7693 // struct be anonymous, which will make any later 7694 // references get the previous definition. 7695 Name = 0; 7696 Previous.clear(); 7697 Invalid = true; 7698 } 7699 } else { 7700 // If the type is currently being defined, complain 7701 // about a nested redefinition. 7702 const TagType *Tag 7703 = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 7704 if (Tag->isBeingDefined()) { 7705 Diag(NameLoc, diag::err_nested_redefinition) << Name; 7706 Diag(PrevTagDecl->getLocation(), 7707 diag::note_previous_definition); 7708 Name = 0; 7709 Previous.clear(); 7710 Invalid = true; 7711 } 7712 } 7713 7714 // Okay, this is definition of a previously declared or referenced 7715 // tag PrevDecl. We're going to create a new Decl for it. 7716 } 7717 } 7718 // If we get here we have (another) forward declaration or we 7719 // have a definition. Just create a new decl. 7720 7721 } else { 7722 // If we get here, this is a definition of a new tag type in a nested 7723 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 7724 // new decl/type. We set PrevDecl to NULL so that the entities 7725 // have distinct types. 7726 Previous.clear(); 7727 } 7728 // If we get here, we're going to create a new Decl. If PrevDecl 7729 // is non-NULL, it's a definition of the tag declared by 7730 // PrevDecl. If it's NULL, we have a new definition. 7731 7732 7733 // Otherwise, PrevDecl is not a tag, but was found with tag 7734 // lookup. This is only actually possible in C++, where a few 7735 // things like templates still live in the tag namespace. 7736 } else { 7737 assert(getLangOptions().CPlusPlus); 7738 7739 // Use a better diagnostic if an elaborated-type-specifier 7740 // found the wrong kind of type on the first 7741 // (non-redeclaration) lookup. 7742 if ((TUK == TUK_Reference || TUK == TUK_Friend) && 7743 !Previous.isForRedeclaration()) { 7744 unsigned Kind = 0; 7745 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 7746 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 7747 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 7748 Diag(NameLoc, diag::err_tag_reference_non_tag) << Kind; 7749 Diag(PrevDecl->getLocation(), diag::note_declared_at); 7750 Invalid = true; 7751 7752 // Otherwise, only diagnose if the declaration is in scope. 7753 } else if (!isDeclInScope(PrevDecl, SearchDC, S, 7754 isExplicitSpecialization)) { 7755 // do nothing 7756 7757 // Diagnose implicit declarations introduced by elaborated types. 7758 } else if (TUK == TUK_Reference || TUK == TUK_Friend) { 7759 unsigned Kind = 0; 7760 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 7761 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 7762 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 7763 Diag(NameLoc, diag::err_tag_reference_conflict) << Kind; 7764 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 7765 Invalid = true; 7766 7767 // Otherwise it's a declaration. Call out a particularly common 7768 // case here. 7769 } else if (TypedefNameDecl *TND = dyn_cast<TypedefNameDecl>(PrevDecl)) { 7770 unsigned Kind = 0; 7771 if (isa<TypeAliasDecl>(PrevDecl)) Kind = 1; 7772 Diag(NameLoc, diag::err_tag_definition_of_typedef) 7773 << Name << Kind << TND->getUnderlyingType(); 7774 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 7775 Invalid = true; 7776 7777 // Otherwise, diagnose. 7778 } else { 7779 // The tag name clashes with something else in the target scope, 7780 // issue an error and recover by making this tag be anonymous. 7781 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 7782 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 7783 Name = 0; 7784 Invalid = true; 7785 } 7786 7787 // The existing declaration isn't relevant to us; we're in a 7788 // new scope, so clear out the previous declaration. 7789 Previous.clear(); 7790 } 7791 } 7792 7793CreateNewDecl: 7794 7795 TagDecl *PrevDecl = 0; 7796 if (Previous.isSingleResult()) 7797 PrevDecl = cast<TagDecl>(Previous.getFoundDecl()); 7798 7799 // If there is an identifier, use the location of the identifier as the 7800 // location of the decl, otherwise use the location of the struct/union 7801 // keyword. 7802 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 7803 7804 // Otherwise, create a new declaration. If there is a previous 7805 // declaration of the same entity, the two will be linked via 7806 // PrevDecl. 7807 TagDecl *New; 7808 7809 bool IsForwardReference = false; 7810 if (Kind == TTK_Enum) { 7811 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 7812 // enum X { A, B, C } D; D should chain to X. 7813 New = EnumDecl::Create(Context, SearchDC, KWLoc, Loc, Name, 7814 cast_or_null<EnumDecl>(PrevDecl), ScopedEnum, 7815 ScopedEnumUsesClassTag, !EnumUnderlying.isNull()); 7816 // If this is an undefined enum, warn. 7817 if (TUK != TUK_Definition && !Invalid) { 7818 TagDecl *Def; 7819 if (getLangOptions().CPlusPlus0x && cast<EnumDecl>(New)->isFixed()) { 7820 // C++0x: 7.2p2: opaque-enum-declaration. 7821 // Conflicts are diagnosed above. Do nothing. 7822 } 7823 else if (PrevDecl && (Def = cast<EnumDecl>(PrevDecl)->getDefinition())) { 7824 Diag(Loc, diag::ext_forward_ref_enum_def) 7825 << New; 7826 Diag(Def->getLocation(), diag::note_previous_definition); 7827 } else { 7828 unsigned DiagID = diag::ext_forward_ref_enum; 7829 if (getLangOptions().MicrosoftExt) 7830 DiagID = diag::ext_ms_forward_ref_enum; 7831 else if (getLangOptions().CPlusPlus) 7832 DiagID = diag::err_forward_ref_enum; 7833 Diag(Loc, DiagID); 7834 7835 // If this is a forward-declared reference to an enumeration, make a 7836 // note of it; we won't actually be introducing the declaration into 7837 // the declaration context. 7838 if (TUK == TUK_Reference) 7839 IsForwardReference = true; 7840 } 7841 } 7842 7843 if (EnumUnderlying) { 7844 EnumDecl *ED = cast<EnumDecl>(New); 7845 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 7846 ED->setIntegerTypeSourceInfo(TI); 7847 else 7848 ED->setIntegerType(QualType(EnumUnderlying.get<const Type*>(), 0)); 7849 ED->setPromotionType(ED->getIntegerType()); 7850 } 7851 7852 } else { 7853 // struct/union/class 7854 7855 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 7856 // struct X { int A; } D; D should chain to X. 7857 if (getLangOptions().CPlusPlus) { 7858 // FIXME: Look for a way to use RecordDecl for simple structs. 7859 New = CXXRecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 7860 cast_or_null<CXXRecordDecl>(PrevDecl)); 7861 7862 if (isStdBadAlloc && (!StdBadAlloc || getStdBadAlloc()->isImplicit())) 7863 StdBadAlloc = cast<CXXRecordDecl>(New); 7864 } else 7865 New = RecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 7866 cast_or_null<RecordDecl>(PrevDecl)); 7867 } 7868 7869 // Maybe add qualifier info. 7870 if (SS.isNotEmpty()) { 7871 if (SS.isSet()) { 7872 New->setQualifierInfo(SS.getWithLocInContext(Context)); 7873 if (TemplateParameterLists.size() > 0) { 7874 New->setTemplateParameterListsInfo(Context, 7875 TemplateParameterLists.size(), 7876 (TemplateParameterList**) TemplateParameterLists.release()); 7877 } 7878 } 7879 else 7880 Invalid = true; 7881 } 7882 7883 if (RecordDecl *RD = dyn_cast<RecordDecl>(New)) { 7884 // Add alignment attributes if necessary; these attributes are checked when 7885 // the ASTContext lays out the structure. 7886 // 7887 // It is important for implementing the correct semantics that this 7888 // happen here (in act on tag decl). The #pragma pack stack is 7889 // maintained as a result of parser callbacks which can occur at 7890 // many points during the parsing of a struct declaration (because 7891 // the #pragma tokens are effectively skipped over during the 7892 // parsing of the struct). 7893 AddAlignmentAttributesForRecord(RD); 7894 7895 AddMsStructLayoutForRecord(RD); 7896 } 7897 7898 if (PrevDecl && PrevDecl->isModulePrivate()) 7899 New->setModulePrivate(); 7900 else if (ModulePrivateLoc.isValid()) { 7901 if (isExplicitSpecialization) 7902 Diag(New->getLocation(), diag::err_module_private_specialization) 7903 << 2 7904 << FixItHint::CreateRemoval(ModulePrivateLoc); 7905 else if (PrevDecl && !PrevDecl->isModulePrivate()) 7906 diagnoseModulePrivateRedeclaration(New, PrevDecl, ModulePrivateLoc); 7907 // __module_private__ does not apply to local classes. However, we only 7908 // diagnose this as an error when the declaration specifiers are 7909 // freestanding. Here, we just ignore the __module_private__. 7910 // foobar 7911 else if (!SearchDC->isFunctionOrMethod()) 7912 New->setModulePrivate(); 7913 } 7914 7915 // If this is a specialization of a member class (of a class template), 7916 // check the specialization. 7917 if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous)) 7918 Invalid = true; 7919 7920 if (Invalid) 7921 New->setInvalidDecl(); 7922 7923 if (Attr) 7924 ProcessDeclAttributeList(S, New, Attr); 7925 7926 // If we're declaring or defining a tag in function prototype scope 7927 // in C, note that this type can only be used within the function. 7928 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 7929 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 7930 7931 // Set the lexical context. If the tag has a C++ scope specifier, the 7932 // lexical context will be different from the semantic context. 7933 New->setLexicalDeclContext(CurContext); 7934 7935 // Mark this as a friend decl if applicable. 7936 // In Microsoft mode, a friend declaration also acts as a forward 7937 // declaration so we always pass true to setObjectOfFriendDecl to make 7938 // the tag name visible. 7939 if (TUK == TUK_Friend) 7940 New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ !Previous.empty() || 7941 getLangOptions().MicrosoftExt); 7942 7943 // Set the access specifier. 7944 if (!Invalid && SearchDC->isRecord()) 7945 SetMemberAccessSpecifier(New, PrevDecl, AS); 7946 7947 if (TUK == TUK_Definition) 7948 New->startDefinition(); 7949 7950 // If this has an identifier, add it to the scope stack. 7951 if (TUK == TUK_Friend) { 7952 // We might be replacing an existing declaration in the lookup tables; 7953 // if so, borrow its access specifier. 7954 if (PrevDecl) 7955 New->setAccess(PrevDecl->getAccess()); 7956 7957 DeclContext *DC = New->getDeclContext()->getRedeclContext(); 7958 DC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 7959 if (Name) // can be null along some error paths 7960 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 7961 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false); 7962 } else if (Name) { 7963 S = getNonFieldDeclScope(S); 7964 PushOnScopeChains(New, S, !IsForwardReference); 7965 if (IsForwardReference) 7966 SearchDC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 7967 7968 } else { 7969 CurContext->addDecl(New); 7970 } 7971 7972 // If this is the C FILE type, notify the AST context. 7973 if (IdentifierInfo *II = New->getIdentifier()) 7974 if (!New->isInvalidDecl() && 7975 New->getDeclContext()->getRedeclContext()->isTranslationUnit() && 7976 II->isStr("FILE")) 7977 Context.setFILEDecl(New); 7978 7979 OwnedDecl = true; 7980 return New; 7981} 7982 7983void Sema::ActOnTagStartDefinition(Scope *S, Decl *TagD) { 7984 AdjustDeclIfTemplate(TagD); 7985 TagDecl *Tag = cast<TagDecl>(TagD); 7986 7987 // Enter the tag context. 7988 PushDeclContext(S, Tag); 7989} 7990 7991void Sema::ActOnObjCContainerStartDefinition(Decl *IDecl) { 7992 assert(isa<ObjCContainerDecl>(IDecl) && 7993 "ActOnObjCContainerStartDefinition - Not ObjCContainerDecl"); 7994 DeclContext *OCD = cast<DeclContext>(IDecl); 7995 assert(getContainingDC(OCD) == CurContext && 7996 "The next DeclContext should be lexically contained in the current one."); 7997 CurContext = OCD; 7998} 7999 8000void Sema::ActOnStartCXXMemberDeclarations(Scope *S, Decl *TagD, 8001 SourceLocation FinalLoc, 8002 SourceLocation LBraceLoc) { 8003 AdjustDeclIfTemplate(TagD); 8004 CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD); 8005 8006 FieldCollector->StartClass(); 8007 8008 if (!Record->getIdentifier()) 8009 return; 8010 8011 if (FinalLoc.isValid()) 8012 Record->addAttr(new (Context) FinalAttr(FinalLoc, Context)); 8013 8014 // C++ [class]p2: 8015 // [...] The class-name is also inserted into the scope of the 8016 // class itself; this is known as the injected-class-name. For 8017 // purposes of access checking, the injected-class-name is treated 8018 // as if it were a public member name. 8019 CXXRecordDecl *InjectedClassName 8020 = CXXRecordDecl::Create(Context, Record->getTagKind(), CurContext, 8021 Record->getLocStart(), Record->getLocation(), 8022 Record->getIdentifier(), 8023 /*PrevDecl=*/0, 8024 /*DelayTypeCreation=*/true); 8025 Context.getTypeDeclType(InjectedClassName, Record); 8026 InjectedClassName->setImplicit(); 8027 InjectedClassName->setAccess(AS_public); 8028 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 8029 InjectedClassName->setDescribedClassTemplate(Template); 8030 PushOnScopeChains(InjectedClassName, S); 8031 assert(InjectedClassName->isInjectedClassName() && 8032 "Broken injected-class-name"); 8033} 8034 8035void Sema::ActOnTagFinishDefinition(Scope *S, Decl *TagD, 8036 SourceLocation RBraceLoc) { 8037 AdjustDeclIfTemplate(TagD); 8038 TagDecl *Tag = cast<TagDecl>(TagD); 8039 Tag->setRBraceLoc(RBraceLoc); 8040 8041 if (isa<CXXRecordDecl>(Tag)) 8042 FieldCollector->FinishClass(); 8043 8044 // Exit this scope of this tag's definition. 8045 PopDeclContext(); 8046 8047 // Notify the consumer that we've defined a tag. 8048 Consumer.HandleTagDeclDefinition(Tag); 8049} 8050 8051void Sema::ActOnObjCContainerFinishDefinition() { 8052 // Exit this scope of this interface definition. 8053 PopDeclContext(); 8054} 8055 8056void Sema::ActOnTagDefinitionError(Scope *S, Decl *TagD) { 8057 AdjustDeclIfTemplate(TagD); 8058 TagDecl *Tag = cast<TagDecl>(TagD); 8059 Tag->setInvalidDecl(); 8060 8061 // We're undoing ActOnTagStartDefinition here, not 8062 // ActOnStartCXXMemberDeclarations, so we don't have to mess with 8063 // the FieldCollector. 8064 8065 PopDeclContext(); 8066} 8067 8068// Note that FieldName may be null for anonymous bitfields. 8069bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName, 8070 QualType FieldTy, const Expr *BitWidth, 8071 bool *ZeroWidth) { 8072 // Default to true; that shouldn't confuse checks for emptiness 8073 if (ZeroWidth) 8074 *ZeroWidth = true; 8075 8076 // C99 6.7.2.1p4 - verify the field type. 8077 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 8078 if (!FieldTy->isDependentType() && !FieldTy->isIntegralOrEnumerationType()) { 8079 // Handle incomplete types with specific error. 8080 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 8081 return true; 8082 if (FieldName) 8083 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 8084 << FieldName << FieldTy << BitWidth->getSourceRange(); 8085 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) 8086 << FieldTy << BitWidth->getSourceRange(); 8087 } else if (DiagnoseUnexpandedParameterPack(const_cast<Expr *>(BitWidth), 8088 UPPC_BitFieldWidth)) 8089 return true; 8090 8091 // If the bit-width is type- or value-dependent, don't try to check 8092 // it now. 8093 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 8094 return false; 8095 8096 llvm::APSInt Value; 8097 if (VerifyIntegerConstantExpression(BitWidth, &Value)) 8098 return true; 8099 8100 if (Value != 0 && ZeroWidth) 8101 *ZeroWidth = false; 8102 8103 // Zero-width bitfield is ok for anonymous field. 8104 if (Value == 0 && FieldName) 8105 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 8106 8107 if (Value.isSigned() && Value.isNegative()) { 8108 if (FieldName) 8109 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 8110 << FieldName << Value.toString(10); 8111 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) 8112 << Value.toString(10); 8113 } 8114 8115 if (!FieldTy->isDependentType()) { 8116 uint64_t TypeSize = Context.getTypeSize(FieldTy); 8117 if (Value.getZExtValue() > TypeSize) { 8118 if (!getLangOptions().CPlusPlus) { 8119 if (FieldName) 8120 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 8121 << FieldName << (unsigned)Value.getZExtValue() 8122 << (unsigned)TypeSize; 8123 8124 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) 8125 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 8126 } 8127 8128 if (FieldName) 8129 Diag(FieldLoc, diag::warn_bitfield_width_exceeds_type_size) 8130 << FieldName << (unsigned)Value.getZExtValue() 8131 << (unsigned)TypeSize; 8132 else 8133 Diag(FieldLoc, diag::warn_anon_bitfield_width_exceeds_type_size) 8134 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 8135 } 8136 } 8137 8138 return false; 8139} 8140 8141/// ActOnField - Each field of a C struct/union is passed into this in order 8142/// to create a FieldDecl object for it. 8143Decl *Sema::ActOnField(Scope *S, Decl *TagD, SourceLocation DeclStart, 8144 Declarator &D, Expr *BitfieldWidth) { 8145 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD), 8146 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 8147 /*HasInit=*/false, AS_public); 8148 return Res; 8149} 8150 8151/// HandleField - Analyze a field of a C struct or a C++ data member. 8152/// 8153FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 8154 SourceLocation DeclStart, 8155 Declarator &D, Expr *BitWidth, bool HasInit, 8156 AccessSpecifier AS) { 8157 IdentifierInfo *II = D.getIdentifier(); 8158 SourceLocation Loc = DeclStart; 8159 if (II) Loc = D.getIdentifierLoc(); 8160 8161 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8162 QualType T = TInfo->getType(); 8163 if (getLangOptions().CPlusPlus) { 8164 CheckExtraCXXDefaultArguments(D); 8165 8166 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 8167 UPPC_DataMemberType)) { 8168 D.setInvalidType(); 8169 T = Context.IntTy; 8170 TInfo = Context.getTrivialTypeSourceInfo(T, Loc); 8171 } 8172 } 8173 8174 DiagnoseFunctionSpecifiers(D); 8175 8176 if (D.getDeclSpec().isThreadSpecified()) 8177 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 8178 if (D.getDeclSpec().isConstexprSpecified()) 8179 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 8180 << 2; 8181 8182 // Check to see if this name was declared as a member previously 8183 LookupResult Previous(*this, II, Loc, LookupMemberName, ForRedeclaration); 8184 LookupName(Previous, S); 8185 assert((Previous.empty() || Previous.isOverloadedResult() || 8186 Previous.isSingleResult()) 8187 && "Lookup of member name should be either overloaded, single or null"); 8188 8189 // If the name is overloaded then get any declaration else get the single result 8190 NamedDecl *PrevDecl = Previous.isOverloadedResult() ? 8191 Previous.getRepresentativeDecl() : Previous.getAsSingle<NamedDecl>(); 8192 8193 if (PrevDecl && PrevDecl->isTemplateParameter()) { 8194 // Maybe we will complain about the shadowed template parameter. 8195 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 8196 // Just pretend that we didn't see the previous declaration. 8197 PrevDecl = 0; 8198 } 8199 8200 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 8201 PrevDecl = 0; 8202 8203 bool Mutable 8204 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable); 8205 SourceLocation TSSL = D.getSourceRange().getBegin(); 8206 FieldDecl *NewFD 8207 = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, HasInit, 8208 TSSL, AS, PrevDecl, &D); 8209 8210 if (NewFD->isInvalidDecl()) 8211 Record->setInvalidDecl(); 8212 8213 if (D.getDeclSpec().isModulePrivateSpecified()) 8214 NewFD->setModulePrivate(); 8215 8216 if (NewFD->isInvalidDecl() && PrevDecl) { 8217 // Don't introduce NewFD into scope; there's already something 8218 // with the same name in the same scope. 8219 } else if (II) { 8220 PushOnScopeChains(NewFD, S); 8221 } else 8222 Record->addDecl(NewFD); 8223 8224 return NewFD; 8225} 8226 8227/// \brief Build a new FieldDecl and check its well-formedness. 8228/// 8229/// This routine builds a new FieldDecl given the fields name, type, 8230/// record, etc. \p PrevDecl should refer to any previous declaration 8231/// with the same name and in the same scope as the field to be 8232/// created. 8233/// 8234/// \returns a new FieldDecl. 8235/// 8236/// \todo The Declarator argument is a hack. It will be removed once 8237FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 8238 TypeSourceInfo *TInfo, 8239 RecordDecl *Record, SourceLocation Loc, 8240 bool Mutable, Expr *BitWidth, bool HasInit, 8241 SourceLocation TSSL, 8242 AccessSpecifier AS, NamedDecl *PrevDecl, 8243 Declarator *D) { 8244 IdentifierInfo *II = Name.getAsIdentifierInfo(); 8245 bool InvalidDecl = false; 8246 if (D) InvalidDecl = D->isInvalidType(); 8247 8248 // If we receive a broken type, recover by assuming 'int' and 8249 // marking this declaration as invalid. 8250 if (T.isNull()) { 8251 InvalidDecl = true; 8252 T = Context.IntTy; 8253 } 8254 8255 QualType EltTy = Context.getBaseElementType(T); 8256 if (!EltTy->isDependentType() && 8257 RequireCompleteType(Loc, EltTy, diag::err_field_incomplete)) { 8258 // Fields of incomplete type force their record to be invalid. 8259 Record->setInvalidDecl(); 8260 InvalidDecl = true; 8261 } 8262 8263 // C99 6.7.2.1p8: A member of a structure or union may have any type other 8264 // than a variably modified type. 8265 if (!InvalidDecl && T->isVariablyModifiedType()) { 8266 bool SizeIsNegative; 8267 llvm::APSInt Oversized; 8268 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 8269 SizeIsNegative, 8270 Oversized); 8271 if (!FixedTy.isNull()) { 8272 Diag(Loc, diag::warn_illegal_constant_array_size); 8273 T = FixedTy; 8274 } else { 8275 if (SizeIsNegative) 8276 Diag(Loc, diag::err_typecheck_negative_array_size); 8277 else if (Oversized.getBoolValue()) 8278 Diag(Loc, diag::err_array_too_large) 8279 << Oversized.toString(10); 8280 else 8281 Diag(Loc, diag::err_typecheck_field_variable_size); 8282 InvalidDecl = true; 8283 } 8284 } 8285 8286 // Fields can not have abstract class types 8287 if (!InvalidDecl && RequireNonAbstractType(Loc, T, 8288 diag::err_abstract_type_in_decl, 8289 AbstractFieldType)) 8290 InvalidDecl = true; 8291 8292 bool ZeroWidth = false; 8293 // If this is declared as a bit-field, check the bit-field. 8294 if (!InvalidDecl && BitWidth && 8295 VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth)) { 8296 InvalidDecl = true; 8297 BitWidth = 0; 8298 ZeroWidth = false; 8299 } 8300 8301 // Check that 'mutable' is consistent with the type of the declaration. 8302 if (!InvalidDecl && Mutable) { 8303 unsigned DiagID = 0; 8304 if (T->isReferenceType()) 8305 DiagID = diag::err_mutable_reference; 8306 else if (T.isConstQualified()) 8307 DiagID = diag::err_mutable_const; 8308 8309 if (DiagID) { 8310 SourceLocation ErrLoc = Loc; 8311 if (D && D->getDeclSpec().getStorageClassSpecLoc().isValid()) 8312 ErrLoc = D->getDeclSpec().getStorageClassSpecLoc(); 8313 Diag(ErrLoc, DiagID); 8314 Mutable = false; 8315 InvalidDecl = true; 8316 } 8317 } 8318 8319 FieldDecl *NewFD = FieldDecl::Create(Context, Record, TSSL, Loc, II, T, TInfo, 8320 BitWidth, Mutable, HasInit); 8321 if (InvalidDecl) 8322 NewFD->setInvalidDecl(); 8323 8324 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 8325 Diag(Loc, diag::err_duplicate_member) << II; 8326 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 8327 NewFD->setInvalidDecl(); 8328 } 8329 8330 if (!InvalidDecl && getLangOptions().CPlusPlus) { 8331 if (Record->isUnion()) { 8332 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 8333 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 8334 if (RDecl->getDefinition()) { 8335 // C++ [class.union]p1: An object of a class with a non-trivial 8336 // constructor, a non-trivial copy constructor, a non-trivial 8337 // destructor, or a non-trivial copy assignment operator 8338 // cannot be a member of a union, nor can an array of such 8339 // objects. 8340 if (!getLangOptions().CPlusPlus0x && CheckNontrivialField(NewFD)) 8341 NewFD->setInvalidDecl(); 8342 } 8343 } 8344 8345 // C++ [class.union]p1: If a union contains a member of reference type, 8346 // the program is ill-formed. 8347 if (EltTy->isReferenceType()) { 8348 Diag(NewFD->getLocation(), diag::err_union_member_of_reference_type) 8349 << NewFD->getDeclName() << EltTy; 8350 NewFD->setInvalidDecl(); 8351 } 8352 } 8353 } 8354 8355 // FIXME: We need to pass in the attributes given an AST 8356 // representation, not a parser representation. 8357 if (D) 8358 // FIXME: What to pass instead of TUScope? 8359 ProcessDeclAttributes(TUScope, NewFD, *D); 8360 8361 // In auto-retain/release, infer strong retension for fields of 8362 // retainable type. 8363 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewFD)) 8364 NewFD->setInvalidDecl(); 8365 8366 if (T.isObjCGCWeak()) 8367 Diag(Loc, diag::warn_attribute_weak_on_field); 8368 8369 NewFD->setAccess(AS); 8370 return NewFD; 8371} 8372 8373bool Sema::CheckNontrivialField(FieldDecl *FD) { 8374 assert(FD); 8375 assert(getLangOptions().CPlusPlus && "valid check only for C++"); 8376 8377 if (FD->isInvalidDecl()) 8378 return true; 8379 8380 QualType EltTy = Context.getBaseElementType(FD->getType()); 8381 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 8382 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 8383 if (RDecl->getDefinition()) { 8384 // We check for copy constructors before constructors 8385 // because otherwise we'll never get complaints about 8386 // copy constructors. 8387 8388 CXXSpecialMember member = CXXInvalid; 8389 if (!RDecl->hasTrivialCopyConstructor()) 8390 member = CXXCopyConstructor; 8391 else if (!RDecl->hasTrivialDefaultConstructor()) 8392 member = CXXDefaultConstructor; 8393 else if (!RDecl->hasTrivialCopyAssignment()) 8394 member = CXXCopyAssignment; 8395 else if (!RDecl->hasTrivialDestructor()) 8396 member = CXXDestructor; 8397 8398 if (member != CXXInvalid) { 8399 if (getLangOptions().ObjCAutoRefCount && RDecl->hasObjectMember()) { 8400 // Objective-C++ ARC: it is an error to have a non-trivial field of 8401 // a union. However, system headers in Objective-C programs 8402 // occasionally have Objective-C lifetime objects within unions, 8403 // and rather than cause the program to fail, we make those 8404 // members unavailable. 8405 SourceLocation Loc = FD->getLocation(); 8406 if (getSourceManager().isInSystemHeader(Loc)) { 8407 if (!FD->hasAttr<UnavailableAttr>()) 8408 FD->addAttr(new (Context) UnavailableAttr(Loc, Context, 8409 "this system field has retaining ownership")); 8410 return false; 8411 } 8412 } 8413 8414 Diag(FD->getLocation(), diag::err_illegal_union_or_anon_struct_member) 8415 << (int)FD->getParent()->isUnion() << FD->getDeclName() << member; 8416 DiagnoseNontrivial(RT, member); 8417 return true; 8418 } 8419 } 8420 } 8421 8422 return false; 8423} 8424 8425/// DiagnoseNontrivial - Given that a class has a non-trivial 8426/// special member, figure out why. 8427void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) { 8428 QualType QT(T, 0U); 8429 CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl()); 8430 8431 // Check whether the member was user-declared. 8432 switch (member) { 8433 case CXXInvalid: 8434 break; 8435 8436 case CXXDefaultConstructor: 8437 if (RD->hasUserDeclaredConstructor()) { 8438 typedef CXXRecordDecl::ctor_iterator ctor_iter; 8439 for (ctor_iter ci = RD->ctor_begin(), ce = RD->ctor_end(); ci != ce;++ci){ 8440 const FunctionDecl *body = 0; 8441 ci->hasBody(body); 8442 if (!body || !cast<CXXConstructorDecl>(body)->isImplicitlyDefined()) { 8443 SourceLocation CtorLoc = ci->getLocation(); 8444 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8445 return; 8446 } 8447 } 8448 8449 llvm_unreachable("found no user-declared constructors"); 8450 } 8451 break; 8452 8453 case CXXCopyConstructor: 8454 if (RD->hasUserDeclaredCopyConstructor()) { 8455 SourceLocation CtorLoc = 8456 RD->getCopyConstructor(0)->getLocation(); 8457 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8458 return; 8459 } 8460 break; 8461 8462 case CXXMoveConstructor: 8463 if (RD->hasUserDeclaredMoveConstructor()) { 8464 SourceLocation CtorLoc = RD->getMoveConstructor()->getLocation(); 8465 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8466 return; 8467 } 8468 break; 8469 8470 case CXXCopyAssignment: 8471 if (RD->hasUserDeclaredCopyAssignment()) { 8472 // FIXME: this should use the location of the copy 8473 // assignment, not the type. 8474 SourceLocation TyLoc = RD->getSourceRange().getBegin(); 8475 Diag(TyLoc, diag::note_nontrivial_user_defined) << QT << member; 8476 return; 8477 } 8478 break; 8479 8480 case CXXMoveAssignment: 8481 if (RD->hasUserDeclaredMoveAssignment()) { 8482 SourceLocation AssignLoc = RD->getMoveAssignmentOperator()->getLocation(); 8483 Diag(AssignLoc, diag::note_nontrivial_user_defined) << QT << member; 8484 return; 8485 } 8486 break; 8487 8488 case CXXDestructor: 8489 if (RD->hasUserDeclaredDestructor()) { 8490 SourceLocation DtorLoc = LookupDestructor(RD)->getLocation(); 8491 Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8492 return; 8493 } 8494 break; 8495 } 8496 8497 typedef CXXRecordDecl::base_class_iterator base_iter; 8498 8499 // Virtual bases and members inhibit trivial copying/construction, 8500 // but not trivial destruction. 8501 if (member != CXXDestructor) { 8502 // Check for virtual bases. vbases includes indirect virtual bases, 8503 // so we just iterate through the direct bases. 8504 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) 8505 if (bi->isVirtual()) { 8506 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 8507 Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1; 8508 return; 8509 } 8510 8511 // Check for virtual methods. 8512 typedef CXXRecordDecl::method_iterator meth_iter; 8513 for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me; 8514 ++mi) { 8515 if (mi->isVirtual()) { 8516 SourceLocation MLoc = mi->getSourceRange().getBegin(); 8517 Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0; 8518 return; 8519 } 8520 } 8521 } 8522 8523 bool (CXXRecordDecl::*hasTrivial)() const; 8524 switch (member) { 8525 case CXXDefaultConstructor: 8526 hasTrivial = &CXXRecordDecl::hasTrivialDefaultConstructor; break; 8527 case CXXCopyConstructor: 8528 hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break; 8529 case CXXCopyAssignment: 8530 hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break; 8531 case CXXDestructor: 8532 hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break; 8533 default: 8534 llvm_unreachable("unexpected special member"); 8535 } 8536 8537 // Check for nontrivial bases (and recurse). 8538 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) { 8539 const RecordType *BaseRT = bi->getType()->getAs<RecordType>(); 8540 assert(BaseRT && "Don't know how to handle dependent bases"); 8541 CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl()); 8542 if (!(BaseRecTy->*hasTrivial)()) { 8543 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 8544 Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member; 8545 DiagnoseNontrivial(BaseRT, member); 8546 return; 8547 } 8548 } 8549 8550 // Check for nontrivial members (and recurse). 8551 typedef RecordDecl::field_iterator field_iter; 8552 for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe; 8553 ++fi) { 8554 QualType EltTy = Context.getBaseElementType((*fi)->getType()); 8555 if (const RecordType *EltRT = EltTy->getAs<RecordType>()) { 8556 CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl()); 8557 8558 if (!(EltRD->*hasTrivial)()) { 8559 SourceLocation FLoc = (*fi)->getLocation(); 8560 Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member; 8561 DiagnoseNontrivial(EltRT, member); 8562 return; 8563 } 8564 } 8565 8566 if (EltTy->isObjCLifetimeType()) { 8567 switch (EltTy.getObjCLifetime()) { 8568 case Qualifiers::OCL_None: 8569 case Qualifiers::OCL_ExplicitNone: 8570 break; 8571 8572 case Qualifiers::OCL_Autoreleasing: 8573 case Qualifiers::OCL_Weak: 8574 case Qualifiers::OCL_Strong: 8575 Diag((*fi)->getLocation(), diag::note_nontrivial_objc_ownership) 8576 << QT << EltTy.getObjCLifetime(); 8577 return; 8578 } 8579 } 8580 } 8581 8582 llvm_unreachable("found no explanation for non-trivial member"); 8583} 8584 8585/// TranslateIvarVisibility - Translate visibility from a token ID to an 8586/// AST enum value. 8587static ObjCIvarDecl::AccessControl 8588TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 8589 switch (ivarVisibility) { 8590 default: llvm_unreachable("Unknown visitibility kind"); 8591 case tok::objc_private: return ObjCIvarDecl::Private; 8592 case tok::objc_public: return ObjCIvarDecl::Public; 8593 case tok::objc_protected: return ObjCIvarDecl::Protected; 8594 case tok::objc_package: return ObjCIvarDecl::Package; 8595 } 8596} 8597 8598/// ActOnIvar - Each ivar field of an objective-c class is passed into this 8599/// in order to create an IvarDecl object for it. 8600Decl *Sema::ActOnIvar(Scope *S, 8601 SourceLocation DeclStart, 8602 Declarator &D, Expr *BitfieldWidth, 8603 tok::ObjCKeywordKind Visibility) { 8604 8605 IdentifierInfo *II = D.getIdentifier(); 8606 Expr *BitWidth = (Expr*)BitfieldWidth; 8607 SourceLocation Loc = DeclStart; 8608 if (II) Loc = D.getIdentifierLoc(); 8609 8610 // FIXME: Unnamed fields can be handled in various different ways, for 8611 // example, unnamed unions inject all members into the struct namespace! 8612 8613 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8614 QualType T = TInfo->getType(); 8615 8616 if (BitWidth) { 8617 // 6.7.2.1p3, 6.7.2.1p4 8618 if (VerifyBitField(Loc, II, T, BitWidth)) { 8619 D.setInvalidType(); 8620 BitWidth = 0; 8621 } 8622 } else { 8623 // Not a bitfield. 8624 8625 // validate II. 8626 8627 } 8628 if (T->isReferenceType()) { 8629 Diag(Loc, diag::err_ivar_reference_type); 8630 D.setInvalidType(); 8631 } 8632 // C99 6.7.2.1p8: A member of a structure or union may have any type other 8633 // than a variably modified type. 8634 else if (T->isVariablyModifiedType()) { 8635 Diag(Loc, diag::err_typecheck_ivar_variable_size); 8636 D.setInvalidType(); 8637 } 8638 8639 // Get the visibility (access control) for this ivar. 8640 ObjCIvarDecl::AccessControl ac = 8641 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 8642 : ObjCIvarDecl::None; 8643 // Must set ivar's DeclContext to its enclosing interface. 8644 ObjCContainerDecl *EnclosingDecl = cast<ObjCContainerDecl>(CurContext); 8645 ObjCContainerDecl *EnclosingContext; 8646 if (ObjCImplementationDecl *IMPDecl = 8647 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 8648 if (!LangOpts.ObjCNonFragileABI2) { 8649 // Case of ivar declared in an implementation. Context is that of its class. 8650 EnclosingContext = IMPDecl->getClassInterface(); 8651 assert(EnclosingContext && "Implementation has no class interface!"); 8652 } 8653 else 8654 EnclosingContext = EnclosingDecl; 8655 } else { 8656 if (ObjCCategoryDecl *CDecl = 8657 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 8658 if (!LangOpts.ObjCNonFragileABI2 || !CDecl->IsClassExtension()) { 8659 Diag(Loc, diag::err_misplaced_ivar) << CDecl->IsClassExtension(); 8660 return 0; 8661 } 8662 } 8663 EnclosingContext = EnclosingDecl; 8664 } 8665 8666 // Construct the decl. 8667 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, EnclosingContext, 8668 DeclStart, Loc, II, T, 8669 TInfo, ac, (Expr *)BitfieldWidth); 8670 8671 if (II) { 8672 NamedDecl *PrevDecl = LookupSingleName(S, II, Loc, LookupMemberName, 8673 ForRedeclaration); 8674 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S) 8675 && !isa<TagDecl>(PrevDecl)) { 8676 Diag(Loc, diag::err_duplicate_member) << II; 8677 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 8678 NewID->setInvalidDecl(); 8679 } 8680 } 8681 8682 // Process attributes attached to the ivar. 8683 ProcessDeclAttributes(S, NewID, D); 8684 8685 if (D.isInvalidType()) 8686 NewID->setInvalidDecl(); 8687 8688 // In ARC, infer 'retaining' for ivars of retainable type. 8689 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewID)) 8690 NewID->setInvalidDecl(); 8691 8692 if (D.getDeclSpec().isModulePrivateSpecified()) 8693 NewID->setModulePrivate(); 8694 8695 if (II) { 8696 // FIXME: When interfaces are DeclContexts, we'll need to add 8697 // these to the interface. 8698 S->AddDecl(NewID); 8699 IdResolver.AddDecl(NewID); 8700 } 8701 8702 return NewID; 8703} 8704 8705/// ActOnLastBitfield - This routine handles synthesized bitfields rules for 8706/// class and class extensions. For every class @interface and class 8707/// extension @interface, if the last ivar is a bitfield of any type, 8708/// then add an implicit `char :0` ivar to the end of that interface. 8709void Sema::ActOnLastBitfield(SourceLocation DeclLoc, 8710 SmallVectorImpl<Decl *> &AllIvarDecls) { 8711 if (!LangOpts.ObjCNonFragileABI2 || AllIvarDecls.empty()) 8712 return; 8713 8714 Decl *ivarDecl = AllIvarDecls[AllIvarDecls.size()-1]; 8715 ObjCIvarDecl *Ivar = cast<ObjCIvarDecl>(ivarDecl); 8716 8717 if (!Ivar->isBitField()) 8718 return; 8719 uint64_t BitFieldSize = 8720 Ivar->getBitWidth()->EvaluateAsInt(Context).getZExtValue(); 8721 if (BitFieldSize == 0) 8722 return; 8723 ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(CurContext); 8724 if (!ID) { 8725 if (ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(CurContext)) { 8726 if (!CD->IsClassExtension()) 8727 return; 8728 } 8729 // No need to add this to end of @implementation. 8730 else 8731 return; 8732 } 8733 // All conditions are met. Add a new bitfield to the tail end of ivars. 8734 llvm::APInt Zero(Context.getTypeSize(Context.IntTy), 0); 8735 Expr * BW = IntegerLiteral::Create(Context, Zero, Context.IntTy, DeclLoc); 8736 8737 Ivar = ObjCIvarDecl::Create(Context, cast<ObjCContainerDecl>(CurContext), 8738 DeclLoc, DeclLoc, 0, 8739 Context.CharTy, 8740 Context.getTrivialTypeSourceInfo(Context.CharTy, 8741 DeclLoc), 8742 ObjCIvarDecl::Private, BW, 8743 true); 8744 AllIvarDecls.push_back(Ivar); 8745} 8746 8747void Sema::ActOnFields(Scope* S, 8748 SourceLocation RecLoc, Decl *EnclosingDecl, 8749 llvm::ArrayRef<Decl *> Fields, 8750 SourceLocation LBrac, SourceLocation RBrac, 8751 AttributeList *Attr) { 8752 assert(EnclosingDecl && "missing record or interface decl"); 8753 8754 // If the decl this is being inserted into is invalid, then it may be a 8755 // redeclaration or some other bogus case. Don't try to add fields to it. 8756 if (EnclosingDecl->isInvalidDecl()) 8757 return; 8758 8759 // Verify that all the fields are okay. 8760 unsigned NumNamedMembers = 0; 8761 SmallVector<FieldDecl*, 32> RecFields; 8762 8763 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 8764 bool ARCErrReported = false; 8765 for (llvm::ArrayRef<Decl *>::iterator i = Fields.begin(), end = Fields.end(); 8766 i != end; ++i) { 8767 FieldDecl *FD = cast<FieldDecl>(*i); 8768 8769 // Get the type for the field. 8770 const Type *FDTy = FD->getType().getTypePtr(); 8771 8772 if (!FD->isAnonymousStructOrUnion()) { 8773 // Remember all fields written by the user. 8774 RecFields.push_back(FD); 8775 } 8776 8777 // If the field is already invalid for some reason, don't emit more 8778 // diagnostics about it. 8779 if (FD->isInvalidDecl()) { 8780 EnclosingDecl->setInvalidDecl(); 8781 continue; 8782 } 8783 8784 // C99 6.7.2.1p2: 8785 // A structure or union shall not contain a member with 8786 // incomplete or function type (hence, a structure shall not 8787 // contain an instance of itself, but may contain a pointer to 8788 // an instance of itself), except that the last member of a 8789 // structure with more than one named member may have incomplete 8790 // array type; such a structure (and any union containing, 8791 // possibly recursively, a member that is such a structure) 8792 // shall not be a member of a structure or an element of an 8793 // array. 8794 if (FDTy->isFunctionType()) { 8795 // Field declared as a function. 8796 Diag(FD->getLocation(), diag::err_field_declared_as_function) 8797 << FD->getDeclName(); 8798 FD->setInvalidDecl(); 8799 EnclosingDecl->setInvalidDecl(); 8800 continue; 8801 } else if (FDTy->isIncompleteArrayType() && Record && 8802 ((i + 1 == Fields.end() && !Record->isUnion()) || 8803 ((getLangOptions().MicrosoftExt || 8804 getLangOptions().CPlusPlus) && 8805 (i + 1 == Fields.end() || Record->isUnion())))) { 8806 // Flexible array member. 8807 // Microsoft and g++ is more permissive regarding flexible array. 8808 // It will accept flexible array in union and also 8809 // as the sole element of a struct/class. 8810 if (getLangOptions().MicrosoftExt) { 8811 if (Record->isUnion()) 8812 Diag(FD->getLocation(), diag::ext_flexible_array_union_ms) 8813 << FD->getDeclName(); 8814 else if (Fields.size() == 1) 8815 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_ms) 8816 << FD->getDeclName() << Record->getTagKind(); 8817 } else if (getLangOptions().CPlusPlus) { 8818 if (Record->isUnion()) 8819 Diag(FD->getLocation(), diag::ext_flexible_array_union_gnu) 8820 << FD->getDeclName(); 8821 else if (Fields.size() == 1) 8822 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_gnu) 8823 << FD->getDeclName() << Record->getTagKind(); 8824 } else if (NumNamedMembers < 1) { 8825 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 8826 << FD->getDeclName(); 8827 FD->setInvalidDecl(); 8828 EnclosingDecl->setInvalidDecl(); 8829 continue; 8830 } 8831 if (!FD->getType()->isDependentType() && 8832 !Context.getBaseElementType(FD->getType()).isPODType(Context)) { 8833 Diag(FD->getLocation(), diag::err_flexible_array_has_nonpod_type) 8834 << FD->getDeclName() << FD->getType(); 8835 FD->setInvalidDecl(); 8836 EnclosingDecl->setInvalidDecl(); 8837 continue; 8838 } 8839 // Okay, we have a legal flexible array member at the end of the struct. 8840 if (Record) 8841 Record->setHasFlexibleArrayMember(true); 8842 } else if (!FDTy->isDependentType() && 8843 RequireCompleteType(FD->getLocation(), FD->getType(), 8844 diag::err_field_incomplete)) { 8845 // Incomplete type 8846 FD->setInvalidDecl(); 8847 EnclosingDecl->setInvalidDecl(); 8848 continue; 8849 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) { 8850 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 8851 // If this is a member of a union, then entire union becomes "flexible". 8852 if (Record && Record->isUnion()) { 8853 Record->setHasFlexibleArrayMember(true); 8854 } else { 8855 // If this is a struct/class and this is not the last element, reject 8856 // it. Note that GCC supports variable sized arrays in the middle of 8857 // structures. 8858 if (i + 1 != Fields.end()) 8859 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 8860 << FD->getDeclName() << FD->getType(); 8861 else { 8862 // We support flexible arrays at the end of structs in 8863 // other structs as an extension. 8864 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 8865 << FD->getDeclName(); 8866 if (Record) 8867 Record->setHasFlexibleArrayMember(true); 8868 } 8869 } 8870 } 8871 if (Record && FDTTy->getDecl()->hasObjectMember()) 8872 Record->setHasObjectMember(true); 8873 } else if (FDTy->isObjCObjectType()) { 8874 /// A field cannot be an Objective-c object 8875 Diag(FD->getLocation(), diag::err_statically_allocated_object) 8876 << FixItHint::CreateInsertion(FD->getLocation(), "*"); 8877 QualType T = Context.getObjCObjectPointerType(FD->getType()); 8878 FD->setType(T); 8879 } 8880 else if (!getLangOptions().CPlusPlus) { 8881 if (getLangOptions().ObjCAutoRefCount && Record && !ARCErrReported) { 8882 // It's an error in ARC if a field has lifetime. 8883 // We don't want to report this in a system header, though, 8884 // so we just make the field unavailable. 8885 // FIXME: that's really not sufficient; we need to make the type 8886 // itself invalid to, say, initialize or copy. 8887 QualType T = FD->getType(); 8888 Qualifiers::ObjCLifetime lifetime = T.getObjCLifetime(); 8889 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone) { 8890 SourceLocation loc = FD->getLocation(); 8891 if (getSourceManager().isInSystemHeader(loc)) { 8892 if (!FD->hasAttr<UnavailableAttr>()) { 8893 FD->addAttr(new (Context) UnavailableAttr(loc, Context, 8894 "this system field has retaining ownership")); 8895 } 8896 } else { 8897 Diag(FD->getLocation(), diag::err_arc_objc_object_in_struct); 8898 } 8899 ARCErrReported = true; 8900 } 8901 } 8902 else if (getLangOptions().ObjC1 && 8903 getLangOptions().getGC() != LangOptions::NonGC && 8904 Record && !Record->hasObjectMember()) { 8905 if (FD->getType()->isObjCObjectPointerType() || 8906 FD->getType().isObjCGCStrong()) 8907 Record->setHasObjectMember(true); 8908 else if (Context.getAsArrayType(FD->getType())) { 8909 QualType BaseType = Context.getBaseElementType(FD->getType()); 8910 if (BaseType->isRecordType() && 8911 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()) 8912 Record->setHasObjectMember(true); 8913 else if (BaseType->isObjCObjectPointerType() || 8914 BaseType.isObjCGCStrong()) 8915 Record->setHasObjectMember(true); 8916 } 8917 } 8918 } 8919 // Keep track of the number of named members. 8920 if (FD->getIdentifier()) 8921 ++NumNamedMembers; 8922 } 8923 8924 // Okay, we successfully defined 'Record'. 8925 if (Record) { 8926 bool Completed = false; 8927 if (CXXRecordDecl *CXXRecord = dyn_cast<CXXRecordDecl>(Record)) { 8928 if (!CXXRecord->isInvalidDecl()) { 8929 // Set access bits correctly on the directly-declared conversions. 8930 UnresolvedSetImpl *Convs = CXXRecord->getConversionFunctions(); 8931 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); 8932 I != E; ++I) 8933 Convs->setAccess(I, (*I)->getAccess()); 8934 8935 if (!CXXRecord->isDependentType()) { 8936 // Objective-C Automatic Reference Counting: 8937 // If a class has a non-static data member of Objective-C pointer 8938 // type (or array thereof), it is a non-POD type and its 8939 // default constructor (if any), copy constructor, copy assignment 8940 // operator, and destructor are non-trivial. 8941 // 8942 // This rule is also handled by CXXRecordDecl::completeDefinition(). 8943 // However, here we check whether this particular class is only 8944 // non-POD because of the presence of an Objective-C pointer member. 8945 // If so, objects of this type cannot be shared between code compiled 8946 // with instant objects and code compiled with manual retain/release. 8947 if (getLangOptions().ObjCAutoRefCount && 8948 CXXRecord->hasObjectMember() && 8949 CXXRecord->getLinkage() == ExternalLinkage) { 8950 if (CXXRecord->isPOD()) { 8951 Diag(CXXRecord->getLocation(), 8952 diag::warn_arc_non_pod_class_with_object_member) 8953 << CXXRecord; 8954 } else { 8955 // FIXME: Fix-Its would be nice here, but finding a good location 8956 // for them is going to be tricky. 8957 if (CXXRecord->hasTrivialCopyConstructor()) 8958 Diag(CXXRecord->getLocation(), 8959 diag::warn_arc_trivial_member_function_with_object_member) 8960 << CXXRecord << 0; 8961 if (CXXRecord->hasTrivialCopyAssignment()) 8962 Diag(CXXRecord->getLocation(), 8963 diag::warn_arc_trivial_member_function_with_object_member) 8964 << CXXRecord << 1; 8965 if (CXXRecord->hasTrivialDestructor()) 8966 Diag(CXXRecord->getLocation(), 8967 diag::warn_arc_trivial_member_function_with_object_member) 8968 << CXXRecord << 2; 8969 } 8970 } 8971 8972 // Adjust user-defined destructor exception spec. 8973 if (getLangOptions().CPlusPlus0x && 8974 CXXRecord->hasUserDeclaredDestructor()) 8975 AdjustDestructorExceptionSpec(CXXRecord,CXXRecord->getDestructor()); 8976 8977 // Add any implicitly-declared members to this class. 8978 AddImplicitlyDeclaredMembersToClass(CXXRecord); 8979 8980 // If we have virtual base classes, we may end up finding multiple 8981 // final overriders for a given virtual function. Check for this 8982 // problem now. 8983 if (CXXRecord->getNumVBases()) { 8984 CXXFinalOverriderMap FinalOverriders; 8985 CXXRecord->getFinalOverriders(FinalOverriders); 8986 8987 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 8988 MEnd = FinalOverriders.end(); 8989 M != MEnd; ++M) { 8990 for (OverridingMethods::iterator SO = M->second.begin(), 8991 SOEnd = M->second.end(); 8992 SO != SOEnd; ++SO) { 8993 assert(SO->second.size() > 0 && 8994 "Virtual function without overridding functions?"); 8995 if (SO->second.size() == 1) 8996 continue; 8997 8998 // C++ [class.virtual]p2: 8999 // In a derived class, if a virtual member function of a base 9000 // class subobject has more than one final overrider the 9001 // program is ill-formed. 9002 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 9003 << (NamedDecl *)M->first << Record; 9004 Diag(M->first->getLocation(), 9005 diag::note_overridden_virtual_function); 9006 for (OverridingMethods::overriding_iterator 9007 OM = SO->second.begin(), 9008 OMEnd = SO->second.end(); 9009 OM != OMEnd; ++OM) 9010 Diag(OM->Method->getLocation(), diag::note_final_overrider) 9011 << (NamedDecl *)M->first << OM->Method->getParent(); 9012 9013 Record->setInvalidDecl(); 9014 } 9015 } 9016 CXXRecord->completeDefinition(&FinalOverriders); 9017 Completed = true; 9018 } 9019 } 9020 } 9021 } 9022 9023 if (!Completed) 9024 Record->completeDefinition(); 9025 9026 // Now that the record is complete, do any delayed exception spec checks 9027 // we were missing. 9028 while (!DelayedDestructorExceptionSpecChecks.empty()) { 9029 const CXXDestructorDecl *Dtor = 9030 DelayedDestructorExceptionSpecChecks.back().first; 9031 if (Dtor->getParent() != Record) 9032 break; 9033 9034 assert(!Dtor->getParent()->isDependentType() && 9035 "Should not ever add destructors of templates into the list."); 9036 CheckOverridingFunctionExceptionSpec(Dtor, 9037 DelayedDestructorExceptionSpecChecks.back().second); 9038 DelayedDestructorExceptionSpecChecks.pop_back(); 9039 } 9040 9041 } else { 9042 ObjCIvarDecl **ClsFields = 9043 reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); 9044 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 9045 ID->setLocEnd(RBrac); 9046 // Add ivar's to class's DeclContext. 9047 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 9048 ClsFields[i]->setLexicalDeclContext(ID); 9049 ID->addDecl(ClsFields[i]); 9050 } 9051 // Must enforce the rule that ivars in the base classes may not be 9052 // duplicates. 9053 if (ID->getSuperClass()) 9054 DiagnoseDuplicateIvars(ID, ID->getSuperClass()); 9055 } else if (ObjCImplementationDecl *IMPDecl = 9056 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 9057 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 9058 for (unsigned I = 0, N = RecFields.size(); I != N; ++I) 9059 // Ivar declared in @implementation never belongs to the implementation. 9060 // Only it is in implementation's lexical context. 9061 ClsFields[I]->setLexicalDeclContext(IMPDecl); 9062 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 9063 } else if (ObjCCategoryDecl *CDecl = 9064 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 9065 // case of ivars in class extension; all other cases have been 9066 // reported as errors elsewhere. 9067 // FIXME. Class extension does not have a LocEnd field. 9068 // CDecl->setLocEnd(RBrac); 9069 // Add ivar's to class extension's DeclContext. 9070 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 9071 ClsFields[i]->setLexicalDeclContext(CDecl); 9072 CDecl->addDecl(ClsFields[i]); 9073 } 9074 } 9075 } 9076 9077 if (Attr) 9078 ProcessDeclAttributeList(S, Record, Attr); 9079 9080 // If there's a #pragma GCC visibility in scope, and this isn't a subclass, 9081 // set the visibility of this record. 9082 if (Record && !Record->getDeclContext()->isRecord()) 9083 AddPushedVisibilityAttribute(Record); 9084} 9085 9086/// \brief Determine whether the given integral value is representable within 9087/// the given type T. 9088static bool isRepresentableIntegerValue(ASTContext &Context, 9089 llvm::APSInt &Value, 9090 QualType T) { 9091 assert(T->isIntegralType(Context) && "Integral type required!"); 9092 unsigned BitWidth = Context.getIntWidth(T); 9093 9094 if (Value.isUnsigned() || Value.isNonNegative()) { 9095 if (T->isSignedIntegerOrEnumerationType()) 9096 --BitWidth; 9097 return Value.getActiveBits() <= BitWidth; 9098 } 9099 return Value.getMinSignedBits() <= BitWidth; 9100} 9101 9102// \brief Given an integral type, return the next larger integral type 9103// (or a NULL type of no such type exists). 9104static QualType getNextLargerIntegralType(ASTContext &Context, QualType T) { 9105 // FIXME: Int128/UInt128 support, which also needs to be introduced into 9106 // enum checking below. 9107 assert(T->isIntegralType(Context) && "Integral type required!"); 9108 const unsigned NumTypes = 4; 9109 QualType SignedIntegralTypes[NumTypes] = { 9110 Context.ShortTy, Context.IntTy, Context.LongTy, Context.LongLongTy 9111 }; 9112 QualType UnsignedIntegralTypes[NumTypes] = { 9113 Context.UnsignedShortTy, Context.UnsignedIntTy, Context.UnsignedLongTy, 9114 Context.UnsignedLongLongTy 9115 }; 9116 9117 unsigned BitWidth = Context.getTypeSize(T); 9118 QualType *Types = T->isSignedIntegerOrEnumerationType()? SignedIntegralTypes 9119 : UnsignedIntegralTypes; 9120 for (unsigned I = 0; I != NumTypes; ++I) 9121 if (Context.getTypeSize(Types[I]) > BitWidth) 9122 return Types[I]; 9123 9124 return QualType(); 9125} 9126 9127EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 9128 EnumConstantDecl *LastEnumConst, 9129 SourceLocation IdLoc, 9130 IdentifierInfo *Id, 9131 Expr *Val) { 9132 unsigned IntWidth = Context.getTargetInfo().getIntWidth(); 9133 llvm::APSInt EnumVal(IntWidth); 9134 QualType EltTy; 9135 9136 if (Val && DiagnoseUnexpandedParameterPack(Val, UPPC_EnumeratorValue)) 9137 Val = 0; 9138 9139 if (Val) { 9140 if (Enum->isDependentType() || Val->isTypeDependent()) 9141 EltTy = Context.DependentTy; 9142 else { 9143 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 9144 SourceLocation ExpLoc; 9145 if (!Val->isValueDependent() && 9146 VerifyIntegerConstantExpression(Val, &EnumVal)) { 9147 Val = 0; 9148 } else { 9149 if (!getLangOptions().CPlusPlus) { 9150 // C99 6.7.2.2p2: 9151 // The expression that defines the value of an enumeration constant 9152 // shall be an integer constant expression that has a value 9153 // representable as an int. 9154 9155 // Complain if the value is not representable in an int. 9156 if (!isRepresentableIntegerValue(Context, EnumVal, Context.IntTy)) 9157 Diag(IdLoc, diag::ext_enum_value_not_int) 9158 << EnumVal.toString(10) << Val->getSourceRange() 9159 << (EnumVal.isUnsigned() || EnumVal.isNonNegative()); 9160 else if (!Context.hasSameType(Val->getType(), Context.IntTy)) { 9161 // Force the type of the expression to 'int'. 9162 Val = ImpCastExprToType(Val, Context.IntTy, CK_IntegralCast).take(); 9163 } 9164 } 9165 9166 if (Enum->isFixed()) { 9167 EltTy = Enum->getIntegerType(); 9168 9169 // C++0x [dcl.enum]p5: 9170 // ... if the initializing value of an enumerator cannot be 9171 // represented by the underlying type, the program is ill-formed. 9172 if (!isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 9173 if (getLangOptions().MicrosoftExt) { 9174 Diag(IdLoc, diag::ext_enumerator_too_large) << EltTy; 9175 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 9176 } else 9177 Diag(IdLoc, diag::err_enumerator_too_large) 9178 << EltTy; 9179 } else 9180 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 9181 } 9182 else { 9183 // C++0x [dcl.enum]p5: 9184 // If the underlying type is not fixed, the type of each enumerator 9185 // is the type of its initializing value: 9186 // - If an initializer is specified for an enumerator, the 9187 // initializing value has the same type as the expression. 9188 EltTy = Val->getType(); 9189 } 9190 } 9191 } 9192 } 9193 9194 if (!Val) { 9195 if (Enum->isDependentType()) 9196 EltTy = Context.DependentTy; 9197 else if (!LastEnumConst) { 9198 // C++0x [dcl.enum]p5: 9199 // If the underlying type is not fixed, the type of each enumerator 9200 // is the type of its initializing value: 9201 // - If no initializer is specified for the first enumerator, the 9202 // initializing value has an unspecified integral type. 9203 // 9204 // GCC uses 'int' for its unspecified integral type, as does 9205 // C99 6.7.2.2p3. 9206 if (Enum->isFixed()) { 9207 EltTy = Enum->getIntegerType(); 9208 } 9209 else { 9210 EltTy = Context.IntTy; 9211 } 9212 } else { 9213 // Assign the last value + 1. 9214 EnumVal = LastEnumConst->getInitVal(); 9215 ++EnumVal; 9216 EltTy = LastEnumConst->getType(); 9217 9218 // Check for overflow on increment. 9219 if (EnumVal < LastEnumConst->getInitVal()) { 9220 // C++0x [dcl.enum]p5: 9221 // If the underlying type is not fixed, the type of each enumerator 9222 // is the type of its initializing value: 9223 // 9224 // - Otherwise the type of the initializing value is the same as 9225 // the type of the initializing value of the preceding enumerator 9226 // unless the incremented value is not representable in that type, 9227 // in which case the type is an unspecified integral type 9228 // sufficient to contain the incremented value. If no such type 9229 // exists, the program is ill-formed. 9230 QualType T = getNextLargerIntegralType(Context, EltTy); 9231 if (T.isNull() || Enum->isFixed()) { 9232 // There is no integral type larger enough to represent this 9233 // value. Complain, then allow the value to wrap around. 9234 EnumVal = LastEnumConst->getInitVal(); 9235 EnumVal = EnumVal.zext(EnumVal.getBitWidth() * 2); 9236 ++EnumVal; 9237 if (Enum->isFixed()) 9238 // When the underlying type is fixed, this is ill-formed. 9239 Diag(IdLoc, diag::err_enumerator_wrapped) 9240 << EnumVal.toString(10) 9241 << EltTy; 9242 else 9243 Diag(IdLoc, diag::warn_enumerator_too_large) 9244 << EnumVal.toString(10); 9245 } else { 9246 EltTy = T; 9247 } 9248 9249 // Retrieve the last enumerator's value, extent that type to the 9250 // type that is supposed to be large enough to represent the incremented 9251 // value, then increment. 9252 EnumVal = LastEnumConst->getInitVal(); 9253 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 9254 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 9255 ++EnumVal; 9256 9257 // If we're not in C++, diagnose the overflow of enumerator values, 9258 // which in C99 means that the enumerator value is not representable in 9259 // an int (C99 6.7.2.2p2). However, we support GCC's extension that 9260 // permits enumerator values that are representable in some larger 9261 // integral type. 9262 if (!getLangOptions().CPlusPlus && !T.isNull()) 9263 Diag(IdLoc, diag::warn_enum_value_overflow); 9264 } else if (!getLangOptions().CPlusPlus && 9265 !isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 9266 // Enforce C99 6.7.2.2p2 even when we compute the next value. 9267 Diag(IdLoc, diag::ext_enum_value_not_int) 9268 << EnumVal.toString(10) << 1; 9269 } 9270 } 9271 } 9272 9273 if (!EltTy->isDependentType()) { 9274 // Make the enumerator value match the signedness and size of the 9275 // enumerator's type. 9276 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 9277 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 9278 } 9279 9280 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 9281 Val, EnumVal); 9282} 9283 9284 9285Decl *Sema::ActOnEnumConstant(Scope *S, Decl *theEnumDecl, Decl *lastEnumConst, 9286 SourceLocation IdLoc, IdentifierInfo *Id, 9287 AttributeList *Attr, 9288 SourceLocation EqualLoc, Expr *val) { 9289 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl); 9290 EnumConstantDecl *LastEnumConst = 9291 cast_or_null<EnumConstantDecl>(lastEnumConst); 9292 Expr *Val = static_cast<Expr*>(val); 9293 9294 // The scope passed in may not be a decl scope. Zip up the scope tree until 9295 // we find one that is. 9296 S = getNonFieldDeclScope(S); 9297 9298 // Verify that there isn't already something declared with this name in this 9299 // scope. 9300 NamedDecl *PrevDecl = LookupSingleName(S, Id, IdLoc, LookupOrdinaryName, 9301 ForRedeclaration); 9302 if (PrevDecl && PrevDecl->isTemplateParameter()) { 9303 // Maybe we will complain about the shadowed template parameter. 9304 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 9305 // Just pretend that we didn't see the previous declaration. 9306 PrevDecl = 0; 9307 } 9308 9309 if (PrevDecl) { 9310 // When in C++, we may get a TagDecl with the same name; in this case the 9311 // enum constant will 'hide' the tag. 9312 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 9313 "Received TagDecl when not in C++!"); 9314 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 9315 if (isa<EnumConstantDecl>(PrevDecl)) 9316 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 9317 else 9318 Diag(IdLoc, diag::err_redefinition) << Id; 9319 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 9320 return 0; 9321 } 9322 } 9323 9324 // C++ [class.mem]p13: 9325 // If T is the name of a class, then each of the following shall have a 9326 // name different from T: 9327 // - every enumerator of every member of class T that is an enumerated 9328 // type 9329 if (CXXRecordDecl *Record 9330 = dyn_cast<CXXRecordDecl>( 9331 TheEnumDecl->getDeclContext()->getRedeclContext())) 9332 if (Record->getIdentifier() && Record->getIdentifier() == Id) 9333 Diag(IdLoc, diag::err_member_name_of_class) << Id; 9334 9335 EnumConstantDecl *New = 9336 CheckEnumConstant(TheEnumDecl, LastEnumConst, IdLoc, Id, Val); 9337 9338 if (New) { 9339 // Process attributes. 9340 if (Attr) ProcessDeclAttributeList(S, New, Attr); 9341 9342 // Register this decl in the current scope stack. 9343 New->setAccess(TheEnumDecl->getAccess()); 9344 PushOnScopeChains(New, S); 9345 } 9346 9347 return New; 9348} 9349 9350void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc, 9351 SourceLocation RBraceLoc, Decl *EnumDeclX, 9352 Decl **Elements, unsigned NumElements, 9353 Scope *S, AttributeList *Attr) { 9354 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX); 9355 QualType EnumType = Context.getTypeDeclType(Enum); 9356 9357 if (Attr) 9358 ProcessDeclAttributeList(S, Enum, Attr); 9359 9360 if (Enum->isDependentType()) { 9361 for (unsigned i = 0; i != NumElements; ++i) { 9362 EnumConstantDecl *ECD = 9363 cast_or_null<EnumConstantDecl>(Elements[i]); 9364 if (!ECD) continue; 9365 9366 ECD->setType(EnumType); 9367 } 9368 9369 Enum->completeDefinition(Context.DependentTy, Context.DependentTy, 0, 0); 9370 return; 9371 } 9372 9373 // TODO: If the result value doesn't fit in an int, it must be a long or long 9374 // long value. ISO C does not support this, but GCC does as an extension, 9375 // emit a warning. 9376 unsigned IntWidth = Context.getTargetInfo().getIntWidth(); 9377 unsigned CharWidth = Context.getTargetInfo().getCharWidth(); 9378 unsigned ShortWidth = Context.getTargetInfo().getShortWidth(); 9379 9380 // Verify that all the values are okay, compute the size of the values, and 9381 // reverse the list. 9382 unsigned NumNegativeBits = 0; 9383 unsigned NumPositiveBits = 0; 9384 9385 // Keep track of whether all elements have type int. 9386 bool AllElementsInt = true; 9387 9388 for (unsigned i = 0; i != NumElements; ++i) { 9389 EnumConstantDecl *ECD = 9390 cast_or_null<EnumConstantDecl>(Elements[i]); 9391 if (!ECD) continue; // Already issued a diagnostic. 9392 9393 const llvm::APSInt &InitVal = ECD->getInitVal(); 9394 9395 // Keep track of the size of positive and negative values. 9396 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 9397 NumPositiveBits = std::max(NumPositiveBits, 9398 (unsigned)InitVal.getActiveBits()); 9399 else 9400 NumNegativeBits = std::max(NumNegativeBits, 9401 (unsigned)InitVal.getMinSignedBits()); 9402 9403 // Keep track of whether every enum element has type int (very commmon). 9404 if (AllElementsInt) 9405 AllElementsInt = ECD->getType() == Context.IntTy; 9406 } 9407 9408 // Figure out the type that should be used for this enum. 9409 QualType BestType; 9410 unsigned BestWidth; 9411 9412 // C++0x N3000 [conv.prom]p3: 9413 // An rvalue of an unscoped enumeration type whose underlying 9414 // type is not fixed can be converted to an rvalue of the first 9415 // of the following types that can represent all the values of 9416 // the enumeration: int, unsigned int, long int, unsigned long 9417 // int, long long int, or unsigned long long int. 9418 // C99 6.4.4.3p2: 9419 // An identifier declared as an enumeration constant has type int. 9420 // The C99 rule is modified by a gcc extension 9421 QualType BestPromotionType; 9422 9423 bool Packed = Enum->getAttr<PackedAttr>() ? true : false; 9424 // -fshort-enums is the equivalent to specifying the packed attribute on all 9425 // enum definitions. 9426 if (LangOpts.ShortEnums) 9427 Packed = true; 9428 9429 if (Enum->isFixed()) { 9430 BestType = BestPromotionType = Enum->getIntegerType(); 9431 // We don't need to set BestWidth, because BestType is going to be the type 9432 // of the enumerators, but we do anyway because otherwise some compilers 9433 // warn that it might be used uninitialized. 9434 BestWidth = CharWidth; 9435 } 9436 else if (NumNegativeBits) { 9437 // If there is a negative value, figure out the smallest integer type (of 9438 // int/long/longlong) that fits. 9439 // If it's packed, check also if it fits a char or a short. 9440 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) { 9441 BestType = Context.SignedCharTy; 9442 BestWidth = CharWidth; 9443 } else if (Packed && NumNegativeBits <= ShortWidth && 9444 NumPositiveBits < ShortWidth) { 9445 BestType = Context.ShortTy; 9446 BestWidth = ShortWidth; 9447 } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 9448 BestType = Context.IntTy; 9449 BestWidth = IntWidth; 9450 } else { 9451 BestWidth = Context.getTargetInfo().getLongWidth(); 9452 9453 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) { 9454 BestType = Context.LongTy; 9455 } else { 9456 BestWidth = Context.getTargetInfo().getLongLongWidth(); 9457 9458 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 9459 Diag(Enum->getLocation(), diag::warn_enum_too_large); 9460 BestType = Context.LongLongTy; 9461 } 9462 } 9463 BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType); 9464 } else { 9465 // If there is no negative value, figure out the smallest type that fits 9466 // all of the enumerator values. 9467 // If it's packed, check also if it fits a char or a short. 9468 if (Packed && NumPositiveBits <= CharWidth) { 9469 BestType = Context.UnsignedCharTy; 9470 BestPromotionType = Context.IntTy; 9471 BestWidth = CharWidth; 9472 } else if (Packed && NumPositiveBits <= ShortWidth) { 9473 BestType = Context.UnsignedShortTy; 9474 BestPromotionType = Context.IntTy; 9475 BestWidth = ShortWidth; 9476 } else if (NumPositiveBits <= IntWidth) { 9477 BestType = Context.UnsignedIntTy; 9478 BestWidth = IntWidth; 9479 BestPromotionType 9480 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9481 ? Context.UnsignedIntTy : Context.IntTy; 9482 } else if (NumPositiveBits <= 9483 (BestWidth = Context.getTargetInfo().getLongWidth())) { 9484 BestType = Context.UnsignedLongTy; 9485 BestPromotionType 9486 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9487 ? Context.UnsignedLongTy : Context.LongTy; 9488 } else { 9489 BestWidth = Context.getTargetInfo().getLongLongWidth(); 9490 assert(NumPositiveBits <= BestWidth && 9491 "How could an initializer get larger than ULL?"); 9492 BestType = Context.UnsignedLongLongTy; 9493 BestPromotionType 9494 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9495 ? Context.UnsignedLongLongTy : Context.LongLongTy; 9496 } 9497 } 9498 9499 // Loop over all of the enumerator constants, changing their types to match 9500 // the type of the enum if needed. 9501 for (unsigned i = 0; i != NumElements; ++i) { 9502 EnumConstantDecl *ECD = cast_or_null<EnumConstantDecl>(Elements[i]); 9503 if (!ECD) continue; // Already issued a diagnostic. 9504 9505 // Standard C says the enumerators have int type, but we allow, as an 9506 // extension, the enumerators to be larger than int size. If each 9507 // enumerator value fits in an int, type it as an int, otherwise type it the 9508 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 9509 // that X has type 'int', not 'unsigned'. 9510 9511 // Determine whether the value fits into an int. 9512 llvm::APSInt InitVal = ECD->getInitVal(); 9513 9514 // If it fits into an integer type, force it. Otherwise force it to match 9515 // the enum decl type. 9516 QualType NewTy; 9517 unsigned NewWidth; 9518 bool NewSign; 9519 if (!getLangOptions().CPlusPlus && 9520 isRepresentableIntegerValue(Context, InitVal, Context.IntTy)) { 9521 NewTy = Context.IntTy; 9522 NewWidth = IntWidth; 9523 NewSign = true; 9524 } else if (ECD->getType() == BestType) { 9525 // Already the right type! 9526 if (getLangOptions().CPlusPlus) 9527 // C++ [dcl.enum]p4: Following the closing brace of an 9528 // enum-specifier, each enumerator has the type of its 9529 // enumeration. 9530 ECD->setType(EnumType); 9531 continue; 9532 } else { 9533 NewTy = BestType; 9534 NewWidth = BestWidth; 9535 NewSign = BestType->isSignedIntegerOrEnumerationType(); 9536 } 9537 9538 // Adjust the APSInt value. 9539 InitVal = InitVal.extOrTrunc(NewWidth); 9540 InitVal.setIsSigned(NewSign); 9541 ECD->setInitVal(InitVal); 9542 9543 // Adjust the Expr initializer and type. 9544 if (ECD->getInitExpr() && 9545 !Context.hasSameType(NewTy, ECD->getInitExpr()->getType())) 9546 ECD->setInitExpr(ImplicitCastExpr::Create(Context, NewTy, 9547 CK_IntegralCast, 9548 ECD->getInitExpr(), 9549 /*base paths*/ 0, 9550 VK_RValue)); 9551 if (getLangOptions().CPlusPlus) 9552 // C++ [dcl.enum]p4: Following the closing brace of an 9553 // enum-specifier, each enumerator has the type of its 9554 // enumeration. 9555 ECD->setType(EnumType); 9556 else 9557 ECD->setType(NewTy); 9558 } 9559 9560 Enum->completeDefinition(BestType, BestPromotionType, 9561 NumPositiveBits, NumNegativeBits); 9562} 9563 9564Decl *Sema::ActOnFileScopeAsmDecl(Expr *expr, 9565 SourceLocation StartLoc, 9566 SourceLocation EndLoc) { 9567 StringLiteral *AsmString = cast<StringLiteral>(expr); 9568 9569 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext, 9570 AsmString, StartLoc, 9571 EndLoc); 9572 CurContext->addDecl(New); 9573 return New; 9574} 9575 9576DeclResult Sema::ActOnModuleImport(SourceLocation ImportLoc, 9577 IdentifierInfo &ModuleName, 9578 SourceLocation ModuleNameLoc) { 9579 ModuleKey Module = PP.getModuleLoader().loadModule(ImportLoc, 9580 ModuleName, ModuleNameLoc); 9581 if (!Module) 9582 return true; 9583 9584 // FIXME: Actually create a declaration to describe the module import. 9585 (void)Module; 9586 return DeclResult((Decl *)0); 9587} 9588 9589void 9590Sema::diagnoseModulePrivateRedeclaration(NamedDecl *New, NamedDecl *Old, 9591 SourceLocation ModulePrivateKeyword) { 9592 assert(!Old->isModulePrivate() && "Old is module-private!"); 9593 9594 Diag(New->getLocation(), diag::err_module_private_follows_public) 9595 << New->getDeclName() << SourceRange(ModulePrivateKeyword); 9596 Diag(Old->getLocation(), diag::note_previous_declaration) 9597 << Old->getDeclName(); 9598 9599 // Drop the __module_private__ from the new declaration, since it's invalid. 9600 New->setModulePrivate(false); 9601} 9602 9603void Sema::ActOnPragmaWeakID(IdentifierInfo* Name, 9604 SourceLocation PragmaLoc, 9605 SourceLocation NameLoc) { 9606 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, LookupOrdinaryName); 9607 9608 if (PrevDecl) { 9609 PrevDecl->addAttr(::new (Context) WeakAttr(PragmaLoc, Context)); 9610 } else { 9611 (void)WeakUndeclaredIdentifiers.insert( 9612 std::pair<IdentifierInfo*,WeakInfo> 9613 (Name, WeakInfo((IdentifierInfo*)0, NameLoc))); 9614 } 9615} 9616 9617void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name, 9618 IdentifierInfo* AliasName, 9619 SourceLocation PragmaLoc, 9620 SourceLocation NameLoc, 9621 SourceLocation AliasNameLoc) { 9622 Decl *PrevDecl = LookupSingleName(TUScope, AliasName, AliasNameLoc, 9623 LookupOrdinaryName); 9624 WeakInfo W = WeakInfo(Name, NameLoc); 9625 9626 if (PrevDecl) { 9627 if (!PrevDecl->hasAttr<AliasAttr>()) 9628 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl)) 9629 DeclApplyPragmaWeak(TUScope, ND, W); 9630 } else { 9631 (void)WeakUndeclaredIdentifiers.insert( 9632 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W)); 9633 } 9634} 9635 9636Decl *Sema::getObjCDeclContext() const { 9637 return (dyn_cast_or_null<ObjCContainerDecl>(CurContext)); 9638} 9639