SemaDecl.cpp revision 0ee33912f8ec3453856c8a32ed2c2e8007bed614
1//===--- SemaDecl.cpp - Semantic Analysis for Declarations ----------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "clang/Sema/SemaInternal.h" 15#include "clang/Sema/Initialization.h" 16#include "clang/Sema/Lookup.h" 17#include "clang/Sema/CXXFieldCollector.h" 18#include "clang/Sema/Scope.h" 19#include "clang/Sema/ScopeInfo.h" 20#include "TypeLocBuilder.h" 21#include "clang/AST/APValue.h" 22#include "clang/AST/ASTConsumer.h" 23#include "clang/AST/ASTContext.h" 24#include "clang/AST/CXXInheritance.h" 25#include "clang/AST/DeclCXX.h" 26#include "clang/AST/DeclObjC.h" 27#include "clang/AST/DeclTemplate.h" 28#include "clang/AST/EvaluatedExprVisitor.h" 29#include "clang/AST/ExprCXX.h" 30#include "clang/AST/StmtCXX.h" 31#include "clang/AST/CharUnits.h" 32#include "clang/Sema/DeclSpec.h" 33#include "clang/Sema/ParsedTemplate.h" 34#include "clang/Parse/ParseDiagnostic.h" 35#include "clang/Basic/PartialDiagnostic.h" 36#include "clang/Basic/SourceManager.h" 37#include "clang/Basic/TargetInfo.h" 38// FIXME: layering (ideally, Sema shouldn't be dependent on Lex API's) 39#include "clang/Lex/Preprocessor.h" 40#include "clang/Lex/HeaderSearch.h" 41#include "llvm/ADT/Triple.h" 42#include <algorithm> 43#include <cstring> 44#include <functional> 45using namespace clang; 46using namespace sema; 47 48Sema::DeclGroupPtrTy Sema::ConvertDeclToDeclGroup(Decl *Ptr) { 49 return DeclGroupPtrTy::make(DeclGroupRef(Ptr)); 50} 51 52/// \brief If the identifier refers to a type name within this scope, 53/// return the declaration of that type. 54/// 55/// This routine performs ordinary name lookup of the identifier II 56/// within the given scope, with optional C++ scope specifier SS, to 57/// determine whether the name refers to a type. If so, returns an 58/// opaque pointer (actually a QualType) corresponding to that 59/// type. Otherwise, returns NULL. 60/// 61/// If name lookup results in an ambiguity, this routine will complain 62/// and then return NULL. 63ParsedType Sema::getTypeName(IdentifierInfo &II, SourceLocation NameLoc, 64 Scope *S, CXXScopeSpec *SS, 65 bool isClassName, bool HasTrailingDot, 66 ParsedType ObjectTypePtr, 67 bool WantNontrivialTypeSourceInfo) { 68 // Determine where we will perform name lookup. 69 DeclContext *LookupCtx = 0; 70 if (ObjectTypePtr) { 71 QualType ObjectType = ObjectTypePtr.get(); 72 if (ObjectType->isRecordType()) 73 LookupCtx = computeDeclContext(ObjectType); 74 } else if (SS && SS->isNotEmpty()) { 75 LookupCtx = computeDeclContext(*SS, false); 76 77 if (!LookupCtx) { 78 if (isDependentScopeSpecifier(*SS)) { 79 // C++ [temp.res]p3: 80 // A qualified-id that refers to a type and in which the 81 // nested-name-specifier depends on a template-parameter (14.6.2) 82 // shall be prefixed by the keyword typename to indicate that the 83 // qualified-id denotes a type, forming an 84 // elaborated-type-specifier (7.1.5.3). 85 // 86 // We therefore do not perform any name lookup if the result would 87 // refer to a member of an unknown specialization. 88 if (!isClassName) 89 return ParsedType(); 90 91 // We know from the grammar that this name refers to a type, 92 // so build a dependent node to describe the type. 93 if (WantNontrivialTypeSourceInfo) 94 return ActOnTypenameType(S, SourceLocation(), *SS, II, NameLoc).get(); 95 96 NestedNameSpecifierLoc QualifierLoc = SS->getWithLocInContext(Context); 97 QualType T = 98 CheckTypenameType(ETK_None, SourceLocation(), QualifierLoc, 99 II, NameLoc); 100 101 return ParsedType::make(T); 102 } 103 104 return ParsedType(); 105 } 106 107 if (!LookupCtx->isDependentContext() && 108 RequireCompleteDeclContext(*SS, LookupCtx)) 109 return ParsedType(); 110 } 111 112 // FIXME: LookupNestedNameSpecifierName isn't the right kind of 113 // lookup for class-names. 114 LookupNameKind Kind = isClassName ? LookupNestedNameSpecifierName : 115 LookupOrdinaryName; 116 LookupResult Result(*this, &II, NameLoc, Kind); 117 if (LookupCtx) { 118 // Perform "qualified" name lookup into the declaration context we 119 // computed, which is either the type of the base of a member access 120 // expression or the declaration context associated with a prior 121 // nested-name-specifier. 122 LookupQualifiedName(Result, LookupCtx); 123 124 if (ObjectTypePtr && Result.empty()) { 125 // C++ [basic.lookup.classref]p3: 126 // If the unqualified-id is ~type-name, the type-name is looked up 127 // in the context of the entire postfix-expression. If the type T of 128 // the object expression is of a class type C, the type-name is also 129 // looked up in the scope of class C. At least one of the lookups shall 130 // find a name that refers to (possibly cv-qualified) T. 131 LookupName(Result, S); 132 } 133 } else { 134 // Perform unqualified name lookup. 135 LookupName(Result, S); 136 } 137 138 NamedDecl *IIDecl = 0; 139 switch (Result.getResultKind()) { 140 case LookupResult::NotFound: 141 case LookupResult::NotFoundInCurrentInstantiation: 142 case LookupResult::FoundOverloaded: 143 case LookupResult::FoundUnresolvedValue: 144 Result.suppressDiagnostics(); 145 return ParsedType(); 146 147 case LookupResult::Ambiguous: 148 // Recover from type-hiding ambiguities by hiding the type. We'll 149 // do the lookup again when looking for an object, and we can 150 // diagnose the error then. If we don't do this, then the error 151 // about hiding the type will be immediately followed by an error 152 // that only makes sense if the identifier was treated like a type. 153 if (Result.getAmbiguityKind() == LookupResult::AmbiguousTagHiding) { 154 Result.suppressDiagnostics(); 155 return ParsedType(); 156 } 157 158 // Look to see if we have a type anywhere in the list of results. 159 for (LookupResult::iterator Res = Result.begin(), ResEnd = Result.end(); 160 Res != ResEnd; ++Res) { 161 if (isa<TypeDecl>(*Res) || isa<ObjCInterfaceDecl>(*Res)) { 162 if (!IIDecl || 163 (*Res)->getLocation().getRawEncoding() < 164 IIDecl->getLocation().getRawEncoding()) 165 IIDecl = *Res; 166 } 167 } 168 169 if (!IIDecl) { 170 // None of the entities we found is a type, so there is no way 171 // to even assume that the result is a type. In this case, don't 172 // complain about the ambiguity. The parser will either try to 173 // perform this lookup again (e.g., as an object name), which 174 // will produce the ambiguity, or will complain that it expected 175 // a type name. 176 Result.suppressDiagnostics(); 177 return ParsedType(); 178 } 179 180 // We found a type within the ambiguous lookup; diagnose the 181 // ambiguity and then return that type. This might be the right 182 // answer, or it might not be, but it suppresses any attempt to 183 // perform the name lookup again. 184 break; 185 186 case LookupResult::Found: 187 IIDecl = Result.getFoundDecl(); 188 break; 189 } 190 191 assert(IIDecl && "Didn't find decl"); 192 193 QualType T; 194 if (TypeDecl *TD = dyn_cast<TypeDecl>(IIDecl)) { 195 DiagnoseUseOfDecl(IIDecl, NameLoc); 196 197 if (T.isNull()) 198 T = Context.getTypeDeclType(TD); 199 200 if (SS && SS->isNotEmpty()) { 201 if (WantNontrivialTypeSourceInfo) { 202 // Construct a type with type-source information. 203 TypeLocBuilder Builder; 204 Builder.pushTypeSpec(T).setNameLoc(NameLoc); 205 206 T = getElaboratedType(ETK_None, *SS, T); 207 ElaboratedTypeLoc ElabTL = Builder.push<ElaboratedTypeLoc>(T); 208 ElabTL.setKeywordLoc(SourceLocation()); 209 ElabTL.setQualifierLoc(SS->getWithLocInContext(Context)); 210 return CreateParsedType(T, Builder.getTypeSourceInfo(Context, T)); 211 } else { 212 T = getElaboratedType(ETK_None, *SS, T); 213 } 214 } 215 } else if (ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(IIDecl)) { 216 (void)DiagnoseUseOfDecl(IDecl, NameLoc); 217 if (!HasTrailingDot) 218 T = Context.getObjCInterfaceType(IDecl); 219 } 220 221 if (T.isNull()) { 222 // If it's not plausibly a type, suppress diagnostics. 223 Result.suppressDiagnostics(); 224 return ParsedType(); 225 } 226 return ParsedType::make(T); 227} 228 229/// isTagName() - This method is called *for error recovery purposes only* 230/// to determine if the specified name is a valid tag name ("struct foo"). If 231/// so, this returns the TST for the tag corresponding to it (TST_enum, 232/// TST_union, TST_struct, TST_class). This is used to diagnose cases in C 233/// where the user forgot to specify the tag. 234DeclSpec::TST Sema::isTagName(IdentifierInfo &II, Scope *S) { 235 // Do a tag name lookup in this scope. 236 LookupResult R(*this, &II, SourceLocation(), LookupTagName); 237 LookupName(R, S, false); 238 R.suppressDiagnostics(); 239 if (R.getResultKind() == LookupResult::Found) 240 if (const TagDecl *TD = R.getAsSingle<TagDecl>()) { 241 switch (TD->getTagKind()) { 242 default: return DeclSpec::TST_unspecified; 243 case TTK_Struct: return DeclSpec::TST_struct; 244 case TTK_Union: return DeclSpec::TST_union; 245 case TTK_Class: return DeclSpec::TST_class; 246 case TTK_Enum: return DeclSpec::TST_enum; 247 } 248 } 249 250 return DeclSpec::TST_unspecified; 251} 252 253/// isMicrosoftMissingTypename - In Microsoft mode, within class scope, 254/// if a CXXScopeSpec's type is equal to the type of one of the base classes 255/// then downgrade the missing typename error to a warning. 256/// This is needed for MSVC compatibility; Example: 257/// @code 258/// template<class T> class A { 259/// public: 260/// typedef int TYPE; 261/// }; 262/// template<class T> class B : public A<T> { 263/// public: 264/// A<T>::TYPE a; // no typename required because A<T> is a base class. 265/// }; 266/// @endcode 267bool Sema::isMicrosoftMissingTypename(const CXXScopeSpec *SS) { 268 if (CurContext->isRecord()) { 269 const Type *Ty = SS->getScopeRep()->getAsType(); 270 271 CXXRecordDecl *RD = cast<CXXRecordDecl>(CurContext); 272 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 273 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) 274 if (Context.hasSameUnqualifiedType(QualType(Ty, 1), Base->getType())) 275 return true; 276 } 277 return false; 278} 279 280bool Sema::DiagnoseUnknownTypeName(const IdentifierInfo &II, 281 SourceLocation IILoc, 282 Scope *S, 283 CXXScopeSpec *SS, 284 ParsedType &SuggestedType) { 285 // We don't have anything to suggest (yet). 286 SuggestedType = ParsedType(); 287 288 // There may have been a typo in the name of the type. Look up typo 289 // results, in case we have something that we can suggest. 290 LookupResult Lookup(*this, &II, IILoc, LookupOrdinaryName, 291 NotForRedeclaration); 292 293 if (DeclarationName Corrected = CorrectTypo(Lookup, S, SS, 0, 0, CTC_Type)) { 294 if (NamedDecl *Result = Lookup.getAsSingle<NamedDecl>()) { 295 if ((isa<TypeDecl>(Result) || isa<ObjCInterfaceDecl>(Result)) && 296 !Result->isInvalidDecl()) { 297 // We found a similarly-named type or interface; suggest that. 298 if (!SS || !SS->isSet()) 299 Diag(IILoc, diag::err_unknown_typename_suggest) 300 << &II << Lookup.getLookupName() 301 << FixItHint::CreateReplacement(SourceRange(IILoc), 302 Result->getNameAsString()); 303 else if (DeclContext *DC = computeDeclContext(*SS, false)) 304 Diag(IILoc, diag::err_unknown_nested_typename_suggest) 305 << &II << DC << Lookup.getLookupName() << SS->getRange() 306 << FixItHint::CreateReplacement(SourceRange(IILoc), 307 Result->getNameAsString()); 308 else 309 llvm_unreachable("could not have corrected a typo here"); 310 311 Diag(Result->getLocation(), diag::note_previous_decl) 312 << Result->getDeclName(); 313 314 SuggestedType = getTypeName(*Result->getIdentifier(), IILoc, S, SS, 315 false, false, ParsedType(), 316 /*NonTrivialTypeSourceInfo=*/true); 317 return true; 318 } 319 } else if (Lookup.empty()) { 320 // We corrected to a keyword. 321 // FIXME: Actually recover with the keyword we suggest, and emit a fix-it. 322 Diag(IILoc, diag::err_unknown_typename_suggest) 323 << &II << Corrected; 324 return true; 325 } 326 } 327 328 if (getLangOptions().CPlusPlus) { 329 // See if II is a class template that the user forgot to pass arguments to. 330 UnqualifiedId Name; 331 Name.setIdentifier(&II, IILoc); 332 CXXScopeSpec EmptySS; 333 TemplateTy TemplateResult; 334 bool MemberOfUnknownSpecialization; 335 if (isTemplateName(S, SS ? *SS : EmptySS, /*hasTemplateKeyword=*/false, 336 Name, ParsedType(), true, TemplateResult, 337 MemberOfUnknownSpecialization) == TNK_Type_template) { 338 TemplateName TplName = TemplateResult.getAsVal<TemplateName>(); 339 Diag(IILoc, diag::err_template_missing_args) << TplName; 340 if (TemplateDecl *TplDecl = TplName.getAsTemplateDecl()) { 341 Diag(TplDecl->getLocation(), diag::note_template_decl_here) 342 << TplDecl->getTemplateParameters()->getSourceRange(); 343 } 344 return true; 345 } 346 } 347 348 // FIXME: Should we move the logic that tries to recover from a missing tag 349 // (struct, union, enum) from Parser::ParseImplicitInt here, instead? 350 351 if (!SS || (!SS->isSet() && !SS->isInvalid())) 352 Diag(IILoc, diag::err_unknown_typename) << &II; 353 else if (DeclContext *DC = computeDeclContext(*SS, false)) 354 Diag(IILoc, diag::err_typename_nested_not_found) 355 << &II << DC << SS->getRange(); 356 else if (isDependentScopeSpecifier(*SS)) { 357 unsigned DiagID = diag::err_typename_missing; 358 if (getLangOptions().Microsoft && isMicrosoftMissingTypename(SS)) 359 DiagID = diag::warn_typename_missing; 360 361 Diag(SS->getRange().getBegin(), DiagID) 362 << (NestedNameSpecifier *)SS->getScopeRep() << II.getName() 363 << SourceRange(SS->getRange().getBegin(), IILoc) 364 << FixItHint::CreateInsertion(SS->getRange().getBegin(), "typename "); 365 SuggestedType = ActOnTypenameType(S, SourceLocation(), *SS, II, IILoc).get(); 366 } else { 367 assert(SS && SS->isInvalid() && 368 "Invalid scope specifier has already been diagnosed"); 369 } 370 371 return true; 372} 373 374/// \brief Determine whether the given result set contains either a type name 375/// or 376static bool isResultTypeOrTemplate(LookupResult &R, const Token &NextToken) { 377 bool CheckTemplate = R.getSema().getLangOptions().CPlusPlus && 378 NextToken.is(tok::less); 379 380 for (LookupResult::iterator I = R.begin(), IEnd = R.end(); I != IEnd; ++I) { 381 if (isa<TypeDecl>(*I) || isa<ObjCInterfaceDecl>(*I)) 382 return true; 383 384 if (CheckTemplate && isa<TemplateDecl>(*I)) 385 return true; 386 } 387 388 return false; 389} 390 391Sema::NameClassification Sema::ClassifyName(Scope *S, 392 CXXScopeSpec &SS, 393 IdentifierInfo *&Name, 394 SourceLocation NameLoc, 395 const Token &NextToken) { 396 DeclarationNameInfo NameInfo(Name, NameLoc); 397 ObjCMethodDecl *CurMethod = getCurMethodDecl(); 398 399 if (NextToken.is(tok::coloncolon)) { 400 BuildCXXNestedNameSpecifier(S, *Name, NameLoc, NextToken.getLocation(), 401 QualType(), false, SS, 0, false); 402 403 } 404 405 LookupResult Result(*this, Name, NameLoc, LookupOrdinaryName); 406 LookupParsedName(Result, S, &SS, !CurMethod); 407 408 // Perform lookup for Objective-C instance variables (including automatically 409 // synthesized instance variables), if we're in an Objective-C method. 410 // FIXME: This lookup really, really needs to be folded in to the normal 411 // unqualified lookup mechanism. 412 if (!SS.isSet() && CurMethod && !isResultTypeOrTemplate(Result, NextToken)) { 413 ExprResult E = LookupInObjCMethod(Result, S, Name, true); 414 if (E.get() || E.isInvalid()) 415 return E; 416 417 // Synthesize ivars lazily. 418 if (getLangOptions().ObjCDefaultSynthProperties && 419 getLangOptions().ObjCNonFragileABI2) { 420 if (SynthesizeProvisionalIvar(Result, Name, NameLoc)) { 421 if (const ObjCPropertyDecl *Property = 422 canSynthesizeProvisionalIvar(Name)) { 423 Diag(NameLoc, diag::warn_synthesized_ivar_access) << Name; 424 Diag(Property->getLocation(), diag::note_property_declare); 425 } 426 427 // FIXME: This is strange. Shouldn't we just take the ivar returned 428 // from SynthesizeProvisionalIvar and continue with that? 429 E = LookupInObjCMethod(Result, S, Name, true); 430 if (E.get() || E.isInvalid()) 431 return E; 432 } 433 } 434 } 435 436 bool SecondTry = false; 437 bool IsFilteredTemplateName = false; 438 439Corrected: 440 switch (Result.getResultKind()) { 441 case LookupResult::NotFound: 442 // If an unqualified-id is followed by a '(', then we have a function 443 // call. 444 if (!SS.isSet() && NextToken.is(tok::l_paren)) { 445 // In C++, this is an ADL-only call. 446 // FIXME: Reference? 447 if (getLangOptions().CPlusPlus) 448 return BuildDeclarationNameExpr(SS, Result, /*ADL=*/true); 449 450 // C90 6.3.2.2: 451 // If the expression that precedes the parenthesized argument list in a 452 // function call consists solely of an identifier, and if no 453 // declaration is visible for this identifier, the identifier is 454 // implicitly declared exactly as if, in the innermost block containing 455 // the function call, the declaration 456 // 457 // extern int identifier (); 458 // 459 // appeared. 460 // 461 // We also allow this in C99 as an extension. 462 if (NamedDecl *D = ImplicitlyDefineFunction(NameLoc, *Name, S)) { 463 Result.addDecl(D); 464 Result.resolveKind(); 465 return BuildDeclarationNameExpr(SS, Result, /*ADL=*/false); 466 } 467 } 468 469 // In C, we first see whether there is a tag type by the same name, in 470 // which case it's likely that the user just forget to write "enum", 471 // "struct", or "union". 472 if (!getLangOptions().CPlusPlus && !SecondTry) { 473 Result.clear(LookupTagName); 474 LookupParsedName(Result, S, &SS); 475 if (TagDecl *Tag = Result.getAsSingle<TagDecl>()) { 476 const char *TagName = 0; 477 const char *FixItTagName = 0; 478 switch (Tag->getTagKind()) { 479 case TTK_Class: 480 TagName = "class"; 481 FixItTagName = "class "; 482 break; 483 484 case TTK_Enum: 485 TagName = "enum"; 486 FixItTagName = "enum "; 487 break; 488 489 case TTK_Struct: 490 TagName = "struct"; 491 FixItTagName = "struct "; 492 break; 493 494 case TTK_Union: 495 TagName = "union"; 496 FixItTagName = "union "; 497 break; 498 } 499 500 Diag(NameLoc, diag::err_use_of_tag_name_without_tag) 501 << Name << TagName << getLangOptions().CPlusPlus 502 << FixItHint::CreateInsertion(NameLoc, FixItTagName); 503 break; 504 } 505 506 Result.clear(LookupOrdinaryName); 507 } 508 509 // Perform typo correction to determine if there is another name that is 510 // close to this name. 511 if (!SecondTry) { 512 if (DeclarationName Corrected = CorrectTypo(Result, S, &SS)) { 513 unsigned UnqualifiedDiag = diag::err_undeclared_var_use_suggest; 514 unsigned QualifiedDiag = diag::err_no_member_suggest; 515 516 NamedDecl *FirstDecl = Result.empty()? 0 : *Result.begin(); 517 NamedDecl *UnderlyingFirstDecl 518 = FirstDecl? FirstDecl->getUnderlyingDecl() : 0; 519 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) && 520 UnderlyingFirstDecl && isa<TemplateDecl>(UnderlyingFirstDecl)) { 521 UnqualifiedDiag = diag::err_no_template_suggest; 522 QualifiedDiag = diag::err_no_member_template_suggest; 523 } else if (UnderlyingFirstDecl && 524 (isa<TypeDecl>(UnderlyingFirstDecl) || 525 isa<ObjCInterfaceDecl>(UnderlyingFirstDecl) || 526 isa<ObjCCompatibleAliasDecl>(UnderlyingFirstDecl))) { 527 UnqualifiedDiag = diag::err_unknown_typename_suggest; 528 QualifiedDiag = diag::err_unknown_nested_typename_suggest; 529 } 530 531 if (SS.isEmpty()) 532 Diag(NameLoc, UnqualifiedDiag) 533 << Name << Corrected 534 << FixItHint::CreateReplacement(NameLoc, Corrected.getAsString()); 535 else 536 Diag(NameLoc, QualifiedDiag) 537 << Name << computeDeclContext(SS, false) << Corrected 538 << SS.getRange() 539 << FixItHint::CreateReplacement(NameLoc, Corrected.getAsString()); 540 541 // Update the name, so that the caller has the new name. 542 Name = Corrected.getAsIdentifierInfo(); 543 544 // Typo correction corrected to a keyword. 545 if (Result.empty()) 546 return Corrected.getAsIdentifierInfo(); 547 548 Diag(FirstDecl->getLocation(), diag::note_previous_decl) 549 << FirstDecl->getDeclName(); 550 551 // If we found an Objective-C instance variable, let 552 // LookupInObjCMethod build the appropriate expression to 553 // reference the ivar. 554 // FIXME: This is a gross hack. 555 if (ObjCIvarDecl *Ivar = Result.getAsSingle<ObjCIvarDecl>()) { 556 Result.clear(); 557 ExprResult E(LookupInObjCMethod(Result, S, Ivar->getIdentifier())); 558 return move(E); 559 } 560 561 goto Corrected; 562 } 563 } 564 565 // We failed to correct; just fall through and let the parser deal with it. 566 Result.suppressDiagnostics(); 567 return NameClassification::Unknown(); 568 569 case LookupResult::NotFoundInCurrentInstantiation: 570 // We performed name lookup into the current instantiation, and there were 571 // dependent bases, so we treat this result the same way as any other 572 // dependent nested-name-specifier. 573 574 // C++ [temp.res]p2: 575 // A name used in a template declaration or definition and that is 576 // dependent on a template-parameter is assumed not to name a type 577 // unless the applicable name lookup finds a type name or the name is 578 // qualified by the keyword typename. 579 // 580 // FIXME: If the next token is '<', we might want to ask the parser to 581 // perform some heroics to see if we actually have a 582 // template-argument-list, which would indicate a missing 'template' 583 // keyword here. 584 return BuildDependentDeclRefExpr(SS, NameInfo, /*TemplateArgs=*/0); 585 586 case LookupResult::Found: 587 case LookupResult::FoundOverloaded: 588 case LookupResult::FoundUnresolvedValue: 589 break; 590 591 case LookupResult::Ambiguous: 592 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) && 593 hasAnyAcceptableTemplateNames(Result)) { 594 // C++ [temp.local]p3: 595 // A lookup that finds an injected-class-name (10.2) can result in an 596 // ambiguity in certain cases (for example, if it is found in more than 597 // one base class). If all of the injected-class-names that are found 598 // refer to specializations of the same class template, and if the name 599 // is followed by a template-argument-list, the reference refers to the 600 // class template itself and not a specialization thereof, and is not 601 // ambiguous. 602 // 603 // This filtering can make an ambiguous result into an unambiguous one, 604 // so try again after filtering out template names. 605 FilterAcceptableTemplateNames(Result); 606 if (!Result.isAmbiguous()) { 607 IsFilteredTemplateName = true; 608 break; 609 } 610 } 611 612 // Diagnose the ambiguity and return an error. 613 return NameClassification::Error(); 614 } 615 616 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) && 617 (IsFilteredTemplateName || hasAnyAcceptableTemplateNames(Result))) { 618 // C++ [temp.names]p3: 619 // After name lookup (3.4) finds that a name is a template-name or that 620 // an operator-function-id or a literal- operator-id refers to a set of 621 // overloaded functions any member of which is a function template if 622 // this is followed by a <, the < is always taken as the delimiter of a 623 // template-argument-list and never as the less-than operator. 624 if (!IsFilteredTemplateName) 625 FilterAcceptableTemplateNames(Result); 626 627 if (!Result.empty()) { 628 bool IsFunctionTemplate; 629 TemplateName Template; 630 if (Result.end() - Result.begin() > 1) { 631 IsFunctionTemplate = true; 632 Template = Context.getOverloadedTemplateName(Result.begin(), 633 Result.end()); 634 } else { 635 TemplateDecl *TD 636 = cast<TemplateDecl>((*Result.begin())->getUnderlyingDecl()); 637 IsFunctionTemplate = isa<FunctionTemplateDecl>(TD); 638 639 if (SS.isSet() && !SS.isInvalid()) 640 Template = Context.getQualifiedTemplateName(SS.getScopeRep(), 641 /*TemplateKeyword=*/false, 642 TD); 643 else 644 Template = TemplateName(TD); 645 } 646 647 if (IsFunctionTemplate) { 648 // Function templates always go through overload resolution, at which 649 // point we'll perform the various checks (e.g., accessibility) we need 650 // to based on which function we selected. 651 Result.suppressDiagnostics(); 652 653 return NameClassification::FunctionTemplate(Template); 654 } 655 656 return NameClassification::TypeTemplate(Template); 657 } 658 } 659 660 NamedDecl *FirstDecl = (*Result.begin())->getUnderlyingDecl(); 661 if (TypeDecl *Type = dyn_cast<TypeDecl>(FirstDecl)) { 662 DiagnoseUseOfDecl(Type, NameLoc); 663 QualType T = Context.getTypeDeclType(Type); 664 return ParsedType::make(T); 665 } 666 667 ObjCInterfaceDecl *Class = dyn_cast<ObjCInterfaceDecl>(FirstDecl); 668 if (!Class) { 669 // FIXME: It's unfortunate that we don't have a Type node for handling this. 670 if (ObjCCompatibleAliasDecl *Alias 671 = dyn_cast<ObjCCompatibleAliasDecl>(FirstDecl)) 672 Class = Alias->getClassInterface(); 673 } 674 675 if (Class) { 676 DiagnoseUseOfDecl(Class, NameLoc); 677 678 if (NextToken.is(tok::period)) { 679 // Interface. <something> is parsed as a property reference expression. 680 // Just return "unknown" as a fall-through for now. 681 Result.suppressDiagnostics(); 682 return NameClassification::Unknown(); 683 } 684 685 QualType T = Context.getObjCInterfaceType(Class); 686 return ParsedType::make(T); 687 } 688 689 if (!Result.empty() && (*Result.begin())->isCXXClassMember()) 690 return BuildPossibleImplicitMemberExpr(SS, Result, 0); 691 692 bool ADL = UseArgumentDependentLookup(SS, Result, NextToken.is(tok::l_paren)); 693 return BuildDeclarationNameExpr(SS, Result, ADL); 694} 695 696// Determines the context to return to after temporarily entering a 697// context. This depends in an unnecessarily complicated way on the 698// exact ordering of callbacks from the parser. 699DeclContext *Sema::getContainingDC(DeclContext *DC) { 700 701 // Functions defined inline within classes aren't parsed until we've 702 // finished parsing the top-level class, so the top-level class is 703 // the context we'll need to return to. 704 if (isa<FunctionDecl>(DC)) { 705 DC = DC->getLexicalParent(); 706 707 // A function not defined within a class will always return to its 708 // lexical context. 709 if (!isa<CXXRecordDecl>(DC)) 710 return DC; 711 712 // A C++ inline method/friend is parsed *after* the topmost class 713 // it was declared in is fully parsed ("complete"); the topmost 714 // class is the context we need to return to. 715 while (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC->getLexicalParent())) 716 DC = RD; 717 718 // Return the declaration context of the topmost class the inline method is 719 // declared in. 720 return DC; 721 } 722 723 // ObjCMethodDecls are parsed (for some reason) outside the context 724 // of the class. 725 if (isa<ObjCMethodDecl>(DC)) 726 return DC->getLexicalParent()->getLexicalParent(); 727 728 return DC->getLexicalParent(); 729} 730 731void Sema::PushDeclContext(Scope *S, DeclContext *DC) { 732 assert(getContainingDC(DC) == CurContext && 733 "The next DeclContext should be lexically contained in the current one."); 734 CurContext = DC; 735 S->setEntity(DC); 736} 737 738void Sema::PopDeclContext() { 739 assert(CurContext && "DeclContext imbalance!"); 740 741 CurContext = getContainingDC(CurContext); 742 assert(CurContext && "Popped translation unit!"); 743} 744 745/// EnterDeclaratorContext - Used when we must lookup names in the context 746/// of a declarator's nested name specifier. 747/// 748void Sema::EnterDeclaratorContext(Scope *S, DeclContext *DC) { 749 // C++0x [basic.lookup.unqual]p13: 750 // A name used in the definition of a static data member of class 751 // X (after the qualified-id of the static member) is looked up as 752 // if the name was used in a member function of X. 753 // C++0x [basic.lookup.unqual]p14: 754 // If a variable member of a namespace is defined outside of the 755 // scope of its namespace then any name used in the definition of 756 // the variable member (after the declarator-id) is looked up as 757 // if the definition of the variable member occurred in its 758 // namespace. 759 // Both of these imply that we should push a scope whose context 760 // is the semantic context of the declaration. We can't use 761 // PushDeclContext here because that context is not necessarily 762 // lexically contained in the current context. Fortunately, 763 // the containing scope should have the appropriate information. 764 765 assert(!S->getEntity() && "scope already has entity"); 766 767#ifndef NDEBUG 768 Scope *Ancestor = S->getParent(); 769 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 770 assert(Ancestor->getEntity() == CurContext && "ancestor context mismatch"); 771#endif 772 773 CurContext = DC; 774 S->setEntity(DC); 775} 776 777void Sema::ExitDeclaratorContext(Scope *S) { 778 assert(S->getEntity() == CurContext && "Context imbalance!"); 779 780 // Switch back to the lexical context. The safety of this is 781 // enforced by an assert in EnterDeclaratorContext. 782 Scope *Ancestor = S->getParent(); 783 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 784 CurContext = (DeclContext*) Ancestor->getEntity(); 785 786 // We don't need to do anything with the scope, which is going to 787 // disappear. 788} 789 790/// \brief Determine whether we allow overloading of the function 791/// PrevDecl with another declaration. 792/// 793/// This routine determines whether overloading is possible, not 794/// whether some new function is actually an overload. It will return 795/// true in C++ (where we can always provide overloads) or, as an 796/// extension, in C when the previous function is already an 797/// overloaded function declaration or has the "overloadable" 798/// attribute. 799static bool AllowOverloadingOfFunction(LookupResult &Previous, 800 ASTContext &Context) { 801 if (Context.getLangOptions().CPlusPlus) 802 return true; 803 804 if (Previous.getResultKind() == LookupResult::FoundOverloaded) 805 return true; 806 807 return (Previous.getResultKind() == LookupResult::Found 808 && Previous.getFoundDecl()->hasAttr<OverloadableAttr>()); 809} 810 811/// Add this decl to the scope shadowed decl chains. 812void Sema::PushOnScopeChains(NamedDecl *D, Scope *S, bool AddToContext) { 813 // Move up the scope chain until we find the nearest enclosing 814 // non-transparent context. The declaration will be introduced into this 815 // scope. 816 while (S->getEntity() && 817 ((DeclContext *)S->getEntity())->isTransparentContext()) 818 S = S->getParent(); 819 820 // Add scoped declarations into their context, so that they can be 821 // found later. Declarations without a context won't be inserted 822 // into any context. 823 if (AddToContext) 824 CurContext->addDecl(D); 825 826 // Out-of-line definitions shouldn't be pushed into scope in C++. 827 // Out-of-line variable and function definitions shouldn't even in C. 828 if ((getLangOptions().CPlusPlus || isa<VarDecl>(D) || isa<FunctionDecl>(D)) && 829 D->isOutOfLine()) 830 return; 831 832 // Template instantiations should also not be pushed into scope. 833 if (isa<FunctionDecl>(D) && 834 cast<FunctionDecl>(D)->isFunctionTemplateSpecialization()) 835 return; 836 837 // If this replaces anything in the current scope, 838 IdentifierResolver::iterator I = IdResolver.begin(D->getDeclName()), 839 IEnd = IdResolver.end(); 840 for (; I != IEnd; ++I) { 841 if (S->isDeclScope(*I) && D->declarationReplaces(*I)) { 842 S->RemoveDecl(*I); 843 IdResolver.RemoveDecl(*I); 844 845 // Should only need to replace one decl. 846 break; 847 } 848 } 849 850 S->AddDecl(D); 851 852 if (isa<LabelDecl>(D) && !cast<LabelDecl>(D)->isGnuLocal()) { 853 // Implicitly-generated labels may end up getting generated in an order that 854 // isn't strictly lexical, which breaks name lookup. Be careful to insert 855 // the label at the appropriate place in the identifier chain. 856 for (I = IdResolver.begin(D->getDeclName()); I != IEnd; ++I) { 857 DeclContext *IDC = (*I)->getLexicalDeclContext()->getRedeclContext(); 858 if (IDC == CurContext) { 859 if (!S->isDeclScope(*I)) 860 continue; 861 } else if (IDC->Encloses(CurContext)) 862 break; 863 } 864 865 IdResolver.InsertDeclAfter(I, D); 866 } else { 867 IdResolver.AddDecl(D); 868 } 869} 870 871bool Sema::isDeclInScope(NamedDecl *&D, DeclContext *Ctx, Scope *S, 872 bool ExplicitInstantiationOrSpecialization) { 873 return IdResolver.isDeclInScope(D, Ctx, Context, S, 874 ExplicitInstantiationOrSpecialization); 875} 876 877Scope *Sema::getScopeForDeclContext(Scope *S, DeclContext *DC) { 878 DeclContext *TargetDC = DC->getPrimaryContext(); 879 do { 880 if (DeclContext *ScopeDC = (DeclContext*) S->getEntity()) 881 if (ScopeDC->getPrimaryContext() == TargetDC) 882 return S; 883 } while ((S = S->getParent())); 884 885 return 0; 886} 887 888static bool isOutOfScopePreviousDeclaration(NamedDecl *, 889 DeclContext*, 890 ASTContext&); 891 892/// Filters out lookup results that don't fall within the given scope 893/// as determined by isDeclInScope. 894void Sema::FilterLookupForScope(LookupResult &R, 895 DeclContext *Ctx, Scope *S, 896 bool ConsiderLinkage, 897 bool ExplicitInstantiationOrSpecialization) { 898 LookupResult::Filter F = R.makeFilter(); 899 while (F.hasNext()) { 900 NamedDecl *D = F.next(); 901 902 if (isDeclInScope(D, Ctx, S, ExplicitInstantiationOrSpecialization)) 903 continue; 904 905 if (ConsiderLinkage && 906 isOutOfScopePreviousDeclaration(D, Ctx, Context)) 907 continue; 908 909 F.erase(); 910 } 911 912 F.done(); 913} 914 915static bool isUsingDecl(NamedDecl *D) { 916 return isa<UsingShadowDecl>(D) || 917 isa<UnresolvedUsingTypenameDecl>(D) || 918 isa<UnresolvedUsingValueDecl>(D); 919} 920 921/// Removes using shadow declarations from the lookup results. 922static void RemoveUsingDecls(LookupResult &R) { 923 LookupResult::Filter F = R.makeFilter(); 924 while (F.hasNext()) 925 if (isUsingDecl(F.next())) 926 F.erase(); 927 928 F.done(); 929} 930 931/// \brief Check for this common pattern: 932/// @code 933/// class S { 934/// S(const S&); // DO NOT IMPLEMENT 935/// void operator=(const S&); // DO NOT IMPLEMENT 936/// }; 937/// @endcode 938static bool IsDisallowedCopyOrAssign(const CXXMethodDecl *D) { 939 // FIXME: Should check for private access too but access is set after we get 940 // the decl here. 941 if (D->doesThisDeclarationHaveABody()) 942 return false; 943 944 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(D)) 945 return CD->isCopyConstructor(); 946 if (const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 947 return Method->isCopyAssignmentOperator(); 948 return false; 949} 950 951bool Sema::ShouldWarnIfUnusedFileScopedDecl(const DeclaratorDecl *D) const { 952 assert(D); 953 954 if (D->isInvalidDecl() || D->isUsed() || D->hasAttr<UnusedAttr>()) 955 return false; 956 957 // Ignore class templates. 958 if (D->getDeclContext()->isDependentContext() || 959 D->getLexicalDeclContext()->isDependentContext()) 960 return false; 961 962 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 963 if (FD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 964 return false; 965 966 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 967 if (MD->isVirtual() || IsDisallowedCopyOrAssign(MD)) 968 return false; 969 } else { 970 // 'static inline' functions are used in headers; don't warn. 971 if (FD->getStorageClass() == SC_Static && 972 FD->isInlineSpecified()) 973 return false; 974 } 975 976 if (FD->doesThisDeclarationHaveABody() && 977 Context.DeclMustBeEmitted(FD)) 978 return false; 979 } else if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 980 if (!VD->isFileVarDecl() || 981 VD->getType().isConstant(Context) || 982 Context.DeclMustBeEmitted(VD)) 983 return false; 984 985 if (VD->isStaticDataMember() && 986 VD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 987 return false; 988 989 } else { 990 return false; 991 } 992 993 // Only warn for unused decls internal to the translation unit. 994 if (D->getLinkage() == ExternalLinkage) 995 return false; 996 997 return true; 998} 999 1000void Sema::MarkUnusedFileScopedDecl(const DeclaratorDecl *D) { 1001 if (!D) 1002 return; 1003 1004 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 1005 const FunctionDecl *First = FD->getFirstDeclaration(); 1006 if (FD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 1007 return; // First should already be in the vector. 1008 } 1009 1010 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1011 const VarDecl *First = VD->getFirstDeclaration(); 1012 if (VD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 1013 return; // First should already be in the vector. 1014 } 1015 1016 if (ShouldWarnIfUnusedFileScopedDecl(D)) 1017 UnusedFileScopedDecls.push_back(D); 1018 } 1019 1020static bool ShouldDiagnoseUnusedDecl(const NamedDecl *D) { 1021 if (D->isInvalidDecl()) 1022 return false; 1023 1024 if (D->isUsed() || D->hasAttr<UnusedAttr>()) 1025 return false; 1026 1027 if (isa<LabelDecl>(D)) 1028 return true; 1029 1030 // White-list anything that isn't a local variable. 1031 if (!isa<VarDecl>(D) || isa<ParmVarDecl>(D) || isa<ImplicitParamDecl>(D) || 1032 !D->getDeclContext()->isFunctionOrMethod()) 1033 return false; 1034 1035 // Types of valid local variables should be complete, so this should succeed. 1036 if (const ValueDecl *VD = dyn_cast<ValueDecl>(D)) { 1037 1038 // White-list anything with an __attribute__((unused)) type. 1039 QualType Ty = VD->getType(); 1040 1041 // Only look at the outermost level of typedef. 1042 if (const TypedefType *TT = dyn_cast<TypedefType>(Ty)) { 1043 if (TT->getDecl()->hasAttr<UnusedAttr>()) 1044 return false; 1045 } 1046 1047 // If we failed to complete the type for some reason, or if the type is 1048 // dependent, don't diagnose the variable. 1049 if (Ty->isIncompleteType() || Ty->isDependentType()) 1050 return false; 1051 1052 if (const TagType *TT = Ty->getAs<TagType>()) { 1053 const TagDecl *Tag = TT->getDecl(); 1054 if (Tag->hasAttr<UnusedAttr>()) 1055 return false; 1056 1057 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Tag)) { 1058 // FIXME: Checking for the presence of a user-declared constructor 1059 // isn't completely accurate; we'd prefer to check that the initializer 1060 // has no side effects. 1061 if (RD->hasUserDeclaredConstructor() || !RD->hasTrivialDestructor()) 1062 return false; 1063 } 1064 } 1065 1066 // TODO: __attribute__((unused)) templates? 1067 } 1068 1069 return true; 1070} 1071 1072/// DiagnoseUnusedDecl - Emit warnings about declarations that are not used 1073/// unless they are marked attr(unused). 1074void Sema::DiagnoseUnusedDecl(const NamedDecl *D) { 1075 if (!ShouldDiagnoseUnusedDecl(D)) 1076 return; 1077 1078 unsigned DiagID; 1079 if (isa<VarDecl>(D) && cast<VarDecl>(D)->isExceptionVariable()) 1080 DiagID = diag::warn_unused_exception_param; 1081 else if (isa<LabelDecl>(D)) 1082 DiagID = diag::warn_unused_label; 1083 else 1084 DiagID = diag::warn_unused_variable; 1085 1086 Diag(D->getLocation(), DiagID) << D->getDeclName(); 1087} 1088 1089static void CheckPoppedLabel(LabelDecl *L, Sema &S) { 1090 // Verify that we have no forward references left. If so, there was a goto 1091 // or address of a label taken, but no definition of it. Label fwd 1092 // definitions are indicated with a null substmt. 1093 if (L->getStmt() == 0) 1094 S.Diag(L->getLocation(), diag::err_undeclared_label_use) <<L->getDeclName(); 1095} 1096 1097void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) { 1098 if (S->decl_empty()) return; 1099 assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) && 1100 "Scope shouldn't contain decls!"); 1101 1102 for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end(); 1103 I != E; ++I) { 1104 Decl *TmpD = (*I); 1105 assert(TmpD && "This decl didn't get pushed??"); 1106 1107 assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?"); 1108 NamedDecl *D = cast<NamedDecl>(TmpD); 1109 1110 if (!D->getDeclName()) continue; 1111 1112 // Diagnose unused variables in this scope. 1113 if (!S->hasErrorOccurred()) 1114 DiagnoseUnusedDecl(D); 1115 1116 // If this was a forward reference to a label, verify it was defined. 1117 if (LabelDecl *LD = dyn_cast<LabelDecl>(D)) 1118 CheckPoppedLabel(LD, *this); 1119 1120 // Remove this name from our lexical scope. 1121 IdResolver.RemoveDecl(D); 1122 } 1123} 1124 1125/// \brief Look for an Objective-C class in the translation unit. 1126/// 1127/// \param Id The name of the Objective-C class we're looking for. If 1128/// typo-correction fixes this name, the Id will be updated 1129/// to the fixed name. 1130/// 1131/// \param IdLoc The location of the name in the translation unit. 1132/// 1133/// \param TypoCorrection If true, this routine will attempt typo correction 1134/// if there is no class with the given name. 1135/// 1136/// \returns The declaration of the named Objective-C class, or NULL if the 1137/// class could not be found. 1138ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *&Id, 1139 SourceLocation IdLoc, 1140 bool TypoCorrection) { 1141 // The third "scope" argument is 0 since we aren't enabling lazy built-in 1142 // creation from this context. 1143 NamedDecl *IDecl = LookupSingleName(TUScope, Id, IdLoc, LookupOrdinaryName); 1144 1145 if (!IDecl && TypoCorrection) { 1146 // Perform typo correction at the given location, but only if we 1147 // find an Objective-C class name. 1148 LookupResult R(*this, Id, IdLoc, LookupOrdinaryName); 1149 if (CorrectTypo(R, TUScope, 0, 0, false, CTC_NoKeywords) && 1150 (IDecl = R.getAsSingle<ObjCInterfaceDecl>())) { 1151 Diag(IdLoc, diag::err_undef_interface_suggest) 1152 << Id << IDecl->getDeclName() 1153 << FixItHint::CreateReplacement(IdLoc, IDecl->getNameAsString()); 1154 Diag(IDecl->getLocation(), diag::note_previous_decl) 1155 << IDecl->getDeclName(); 1156 1157 Id = IDecl->getIdentifier(); 1158 } 1159 } 1160 1161 return dyn_cast_or_null<ObjCInterfaceDecl>(IDecl); 1162} 1163 1164/// getNonFieldDeclScope - Retrieves the innermost scope, starting 1165/// from S, where a non-field would be declared. This routine copes 1166/// with the difference between C and C++ scoping rules in structs and 1167/// unions. For example, the following code is well-formed in C but 1168/// ill-formed in C++: 1169/// @code 1170/// struct S6 { 1171/// enum { BAR } e; 1172/// }; 1173/// 1174/// void test_S6() { 1175/// struct S6 a; 1176/// a.e = BAR; 1177/// } 1178/// @endcode 1179/// For the declaration of BAR, this routine will return a different 1180/// scope. The scope S will be the scope of the unnamed enumeration 1181/// within S6. In C++, this routine will return the scope associated 1182/// with S6, because the enumeration's scope is a transparent 1183/// context but structures can contain non-field names. In C, this 1184/// routine will return the translation unit scope, since the 1185/// enumeration's scope is a transparent context and structures cannot 1186/// contain non-field names. 1187Scope *Sema::getNonFieldDeclScope(Scope *S) { 1188 while (((S->getFlags() & Scope::DeclScope) == 0) || 1189 (S->getEntity() && 1190 ((DeclContext *)S->getEntity())->isTransparentContext()) || 1191 (S->isClassScope() && !getLangOptions().CPlusPlus)) 1192 S = S->getParent(); 1193 return S; 1194} 1195 1196/// LazilyCreateBuiltin - The specified Builtin-ID was first used at 1197/// file scope. lazily create a decl for it. ForRedeclaration is true 1198/// if we're creating this built-in in anticipation of redeclaring the 1199/// built-in. 1200NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid, 1201 Scope *S, bool ForRedeclaration, 1202 SourceLocation Loc) { 1203 Builtin::ID BID = (Builtin::ID)bid; 1204 1205 ASTContext::GetBuiltinTypeError Error; 1206 QualType R = Context.GetBuiltinType(BID, Error); 1207 switch (Error) { 1208 case ASTContext::GE_None: 1209 // Okay 1210 break; 1211 1212 case ASTContext::GE_Missing_stdio: 1213 if (ForRedeclaration) 1214 Diag(Loc, diag::warn_implicit_decl_requires_stdio) 1215 << Context.BuiltinInfo.GetName(BID); 1216 return 0; 1217 1218 case ASTContext::GE_Missing_setjmp: 1219 if (ForRedeclaration) 1220 Diag(Loc, diag::warn_implicit_decl_requires_setjmp) 1221 << Context.BuiltinInfo.GetName(BID); 1222 return 0; 1223 } 1224 1225 if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) { 1226 Diag(Loc, diag::ext_implicit_lib_function_decl) 1227 << Context.BuiltinInfo.GetName(BID) 1228 << R; 1229 if (Context.BuiltinInfo.getHeaderName(BID) && 1230 Diags.getDiagnosticLevel(diag::ext_implicit_lib_function_decl, Loc) 1231 != Diagnostic::Ignored) 1232 Diag(Loc, diag::note_please_include_header) 1233 << Context.BuiltinInfo.getHeaderName(BID) 1234 << Context.BuiltinInfo.GetName(BID); 1235 } 1236 1237 FunctionDecl *New = FunctionDecl::Create(Context, 1238 Context.getTranslationUnitDecl(), 1239 Loc, Loc, II, R, /*TInfo=*/0, 1240 SC_Extern, 1241 SC_None, false, 1242 /*hasPrototype=*/true); 1243 New->setImplicit(); 1244 1245 // Create Decl objects for each parameter, adding them to the 1246 // FunctionDecl. 1247 if (const FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) { 1248 llvm::SmallVector<ParmVarDecl*, 16> Params; 1249 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) { 1250 ParmVarDecl *parm = 1251 ParmVarDecl::Create(Context, New, SourceLocation(), 1252 SourceLocation(), 0, 1253 FT->getArgType(i), /*TInfo=*/0, 1254 SC_None, SC_None, 0); 1255 parm->setScopeInfo(0, i); 1256 Params.push_back(parm); 1257 } 1258 New->setParams(Params.data(), Params.size()); 1259 } 1260 1261 AddKnownFunctionAttributes(New); 1262 1263 // TUScope is the translation-unit scope to insert this function into. 1264 // FIXME: This is hideous. We need to teach PushOnScopeChains to 1265 // relate Scopes to DeclContexts, and probably eliminate CurContext 1266 // entirely, but we're not there yet. 1267 DeclContext *SavedContext = CurContext; 1268 CurContext = Context.getTranslationUnitDecl(); 1269 PushOnScopeChains(New, TUScope); 1270 CurContext = SavedContext; 1271 return New; 1272} 1273 1274/// MergeTypedefNameDecl - We just parsed a typedef 'New' which has the 1275/// same name and scope as a previous declaration 'Old'. Figure out 1276/// how to resolve this situation, merging decls or emitting 1277/// diagnostics as appropriate. If there was an error, set New to be invalid. 1278/// 1279void Sema::MergeTypedefNameDecl(TypedefNameDecl *New, LookupResult &OldDecls) { 1280 // If the new decl is known invalid already, don't bother doing any 1281 // merging checks. 1282 if (New->isInvalidDecl()) return; 1283 1284 // Allow multiple definitions for ObjC built-in typedefs. 1285 // FIXME: Verify the underlying types are equivalent! 1286 if (getLangOptions().ObjC1) { 1287 const IdentifierInfo *TypeID = New->getIdentifier(); 1288 switch (TypeID->getLength()) { 1289 default: break; 1290 case 2: 1291 if (!TypeID->isStr("id")) 1292 break; 1293 Context.ObjCIdRedefinitionType = New->getUnderlyingType(); 1294 // Install the built-in type for 'id', ignoring the current definition. 1295 New->setTypeForDecl(Context.getObjCIdType().getTypePtr()); 1296 return; 1297 case 5: 1298 if (!TypeID->isStr("Class")) 1299 break; 1300 Context.ObjCClassRedefinitionType = New->getUnderlyingType(); 1301 // Install the built-in type for 'Class', ignoring the current definition. 1302 New->setTypeForDecl(Context.getObjCClassType().getTypePtr()); 1303 return; 1304 case 3: 1305 if (!TypeID->isStr("SEL")) 1306 break; 1307 Context.ObjCSelRedefinitionType = New->getUnderlyingType(); 1308 // Install the built-in type for 'SEL', ignoring the current definition. 1309 New->setTypeForDecl(Context.getObjCSelType().getTypePtr()); 1310 return; 1311 case 8: 1312 if (!TypeID->isStr("Protocol")) 1313 break; 1314 Context.setObjCProtoType(New->getUnderlyingType()); 1315 return; 1316 } 1317 // Fall through - the typedef name was not a builtin type. 1318 } 1319 1320 // Verify the old decl was also a type. 1321 TypeDecl *Old = OldDecls.getAsSingle<TypeDecl>(); 1322 if (!Old) { 1323 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1324 << New->getDeclName(); 1325 1326 NamedDecl *OldD = OldDecls.getRepresentativeDecl(); 1327 if (OldD->getLocation().isValid()) 1328 Diag(OldD->getLocation(), diag::note_previous_definition); 1329 1330 return New->setInvalidDecl(); 1331 } 1332 1333 // If the old declaration is invalid, just give up here. 1334 if (Old->isInvalidDecl()) 1335 return New->setInvalidDecl(); 1336 1337 // Determine the "old" type we'll use for checking and diagnostics. 1338 QualType OldType; 1339 if (TypedefNameDecl *OldTypedef = dyn_cast<TypedefNameDecl>(Old)) 1340 OldType = OldTypedef->getUnderlyingType(); 1341 else 1342 OldType = Context.getTypeDeclType(Old); 1343 1344 // If the typedef types are not identical, reject them in all languages and 1345 // with any extensions enabled. 1346 1347 if (OldType != New->getUnderlyingType() && 1348 Context.getCanonicalType(OldType) != 1349 Context.getCanonicalType(New->getUnderlyingType())) { 1350 int Kind = 0; 1351 if (isa<TypeAliasDecl>(Old)) 1352 Kind = 1; 1353 Diag(New->getLocation(), diag::err_redefinition_different_typedef) 1354 << Kind << New->getUnderlyingType() << OldType; 1355 if (Old->getLocation().isValid()) 1356 Diag(Old->getLocation(), diag::note_previous_definition); 1357 return New->setInvalidDecl(); 1358 } 1359 1360 // The types match. Link up the redeclaration chain if the old 1361 // declaration was a typedef. 1362 // FIXME: this is a potential source of wierdness if the type 1363 // spellings don't match exactly. 1364 if (TypedefNameDecl *Typedef = dyn_cast<TypedefNameDecl>(Old)) 1365 New->setPreviousDeclaration(Typedef); 1366 1367 if (getLangOptions().Microsoft) 1368 return; 1369 1370 if (getLangOptions().CPlusPlus) { 1371 // C++ [dcl.typedef]p2: 1372 // In a given non-class scope, a typedef specifier can be used to 1373 // redefine the name of any type declared in that scope to refer 1374 // to the type to which it already refers. 1375 if (!isa<CXXRecordDecl>(CurContext)) 1376 return; 1377 1378 // C++0x [dcl.typedef]p4: 1379 // In a given class scope, a typedef specifier can be used to redefine 1380 // any class-name declared in that scope that is not also a typedef-name 1381 // to refer to the type to which it already refers. 1382 // 1383 // This wording came in via DR424, which was a correction to the 1384 // wording in DR56, which accidentally banned code like: 1385 // 1386 // struct S { 1387 // typedef struct A { } A; 1388 // }; 1389 // 1390 // in the C++03 standard. We implement the C++0x semantics, which 1391 // allow the above but disallow 1392 // 1393 // struct S { 1394 // typedef int I; 1395 // typedef int I; 1396 // }; 1397 // 1398 // since that was the intent of DR56. 1399 if (!isa<TypedefNameDecl>(Old)) 1400 return; 1401 1402 Diag(New->getLocation(), diag::err_redefinition) 1403 << New->getDeclName(); 1404 Diag(Old->getLocation(), diag::note_previous_definition); 1405 return New->setInvalidDecl(); 1406 } 1407 1408 // If we have a redefinition of a typedef in C, emit a warning. This warning 1409 // is normally mapped to an error, but can be controlled with 1410 // -Wtypedef-redefinition. If either the original or the redefinition is 1411 // in a system header, don't emit this for compatibility with GCC. 1412 if (getDiagnostics().getSuppressSystemWarnings() && 1413 (Context.getSourceManager().isInSystemHeader(Old->getLocation()) || 1414 Context.getSourceManager().isInSystemHeader(New->getLocation()))) 1415 return; 1416 1417 Diag(New->getLocation(), diag::warn_redefinition_of_typedef) 1418 << New->getDeclName(); 1419 Diag(Old->getLocation(), diag::note_previous_definition); 1420 return; 1421} 1422 1423/// DeclhasAttr - returns true if decl Declaration already has the target 1424/// attribute. 1425static bool 1426DeclHasAttr(const Decl *D, const Attr *A) { 1427 const OwnershipAttr *OA = dyn_cast<OwnershipAttr>(A); 1428 for (Decl::attr_iterator i = D->attr_begin(), e = D->attr_end(); i != e; ++i) 1429 if ((*i)->getKind() == A->getKind()) { 1430 // FIXME: Don't hardcode this check 1431 if (OA && isa<OwnershipAttr>(*i)) 1432 return OA->getOwnKind() == cast<OwnershipAttr>(*i)->getOwnKind(); 1433 return true; 1434 } 1435 1436 return false; 1437} 1438 1439/// mergeDeclAttributes - Copy attributes from the Old decl to the New one. 1440static void mergeDeclAttributes(Decl *newDecl, const Decl *oldDecl, 1441 ASTContext &C) { 1442 if (!oldDecl->hasAttrs()) 1443 return; 1444 1445 bool foundAny = newDecl->hasAttrs(); 1446 1447 // Ensure that any moving of objects within the allocated map is done before 1448 // we process them. 1449 if (!foundAny) newDecl->setAttrs(AttrVec()); 1450 1451 for (specific_attr_iterator<InheritableAttr> 1452 i = oldDecl->specific_attr_begin<InheritableAttr>(), 1453 e = oldDecl->specific_attr_end<InheritableAttr>(); i != e; ++i) { 1454 if (!DeclHasAttr(newDecl, *i)) { 1455 InheritableAttr *newAttr = cast<InheritableAttr>((*i)->clone(C)); 1456 newAttr->setInherited(true); 1457 newDecl->addAttr(newAttr); 1458 foundAny = true; 1459 } 1460 } 1461 1462 if (!foundAny) newDecl->dropAttrs(); 1463} 1464 1465/// mergeParamDeclAttributes - Copy attributes from the old parameter 1466/// to the new one. 1467static void mergeParamDeclAttributes(ParmVarDecl *newDecl, 1468 const ParmVarDecl *oldDecl, 1469 ASTContext &C) { 1470 if (!oldDecl->hasAttrs()) 1471 return; 1472 1473 bool foundAny = newDecl->hasAttrs(); 1474 1475 // Ensure that any moving of objects within the allocated map is 1476 // done before we process them. 1477 if (!foundAny) newDecl->setAttrs(AttrVec()); 1478 1479 for (specific_attr_iterator<InheritableParamAttr> 1480 i = oldDecl->specific_attr_begin<InheritableParamAttr>(), 1481 e = oldDecl->specific_attr_end<InheritableParamAttr>(); i != e; ++i) { 1482 if (!DeclHasAttr(newDecl, *i)) { 1483 InheritableAttr *newAttr = cast<InheritableParamAttr>((*i)->clone(C)); 1484 newAttr->setInherited(true); 1485 newDecl->addAttr(newAttr); 1486 foundAny = true; 1487 } 1488 } 1489 1490 if (!foundAny) newDecl->dropAttrs(); 1491} 1492 1493namespace { 1494 1495/// Used in MergeFunctionDecl to keep track of function parameters in 1496/// C. 1497struct GNUCompatibleParamWarning { 1498 ParmVarDecl *OldParm; 1499 ParmVarDecl *NewParm; 1500 QualType PromotedType; 1501}; 1502 1503} 1504 1505/// getSpecialMember - get the special member enum for a method. 1506Sema::CXXSpecialMember Sema::getSpecialMember(const CXXMethodDecl *MD) { 1507 if (const CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(MD)) { 1508 if (Ctor->isCopyConstructor()) 1509 return Sema::CXXCopyConstructor; 1510 1511 if (Ctor->isDefaultConstructor()) 1512 return Sema::CXXDefaultConstructor; 1513 } 1514 1515 if (isa<CXXDestructorDecl>(MD)) 1516 return Sema::CXXDestructor; 1517 1518 if (MD->isCopyAssignmentOperator()) 1519 return Sema::CXXCopyAssignment; 1520 1521 return Sema::CXXInvalid; 1522} 1523 1524/// canRedefineFunction - checks if a function can be redefined. Currently, 1525/// only extern inline functions can be redefined, and even then only in 1526/// GNU89 mode. 1527static bool canRedefineFunction(const FunctionDecl *FD, 1528 const LangOptions& LangOpts) { 1529 return (LangOpts.GNUMode && !LangOpts.C99 && !LangOpts.CPlusPlus && 1530 FD->isInlineSpecified() && 1531 FD->getStorageClass() == SC_Extern); 1532} 1533 1534/// MergeFunctionDecl - We just parsed a function 'New' from 1535/// declarator D which has the same name and scope as a previous 1536/// declaration 'Old'. Figure out how to resolve this situation, 1537/// merging decls or emitting diagnostics as appropriate. 1538/// 1539/// In C++, New and Old must be declarations that are not 1540/// overloaded. Use IsOverload to determine whether New and Old are 1541/// overloaded, and to select the Old declaration that New should be 1542/// merged with. 1543/// 1544/// Returns true if there was an error, false otherwise. 1545bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD) { 1546 // Verify the old decl was also a function. 1547 FunctionDecl *Old = 0; 1548 if (FunctionTemplateDecl *OldFunctionTemplate 1549 = dyn_cast<FunctionTemplateDecl>(OldD)) 1550 Old = OldFunctionTemplate->getTemplatedDecl(); 1551 else 1552 Old = dyn_cast<FunctionDecl>(OldD); 1553 if (!Old) { 1554 if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(OldD)) { 1555 Diag(New->getLocation(), diag::err_using_decl_conflict_reverse); 1556 Diag(Shadow->getTargetDecl()->getLocation(), 1557 diag::note_using_decl_target); 1558 Diag(Shadow->getUsingDecl()->getLocation(), 1559 diag::note_using_decl) << 0; 1560 return true; 1561 } 1562 1563 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1564 << New->getDeclName(); 1565 Diag(OldD->getLocation(), diag::note_previous_definition); 1566 return true; 1567 } 1568 1569 // Determine whether the previous declaration was a definition, 1570 // implicit declaration, or a declaration. 1571 diag::kind PrevDiag; 1572 if (Old->isThisDeclarationADefinition()) 1573 PrevDiag = diag::note_previous_definition; 1574 else if (Old->isImplicit()) 1575 PrevDiag = diag::note_previous_implicit_declaration; 1576 else 1577 PrevDiag = diag::note_previous_declaration; 1578 1579 QualType OldQType = Context.getCanonicalType(Old->getType()); 1580 QualType NewQType = Context.getCanonicalType(New->getType()); 1581 1582 // Don't complain about this if we're in GNU89 mode and the old function 1583 // is an extern inline function. 1584 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) && 1585 New->getStorageClass() == SC_Static && 1586 Old->getStorageClass() != SC_Static && 1587 !canRedefineFunction(Old, getLangOptions())) { 1588 if (getLangOptions().Microsoft) { 1589 Diag(New->getLocation(), diag::warn_static_non_static) << New; 1590 Diag(Old->getLocation(), PrevDiag); 1591 } else { 1592 Diag(New->getLocation(), diag::err_static_non_static) << New; 1593 Diag(Old->getLocation(), PrevDiag); 1594 return true; 1595 } 1596 } 1597 1598 // If a function is first declared with a calling convention, but is 1599 // later declared or defined without one, the second decl assumes the 1600 // calling convention of the first. 1601 // 1602 // For the new decl, we have to look at the NON-canonical type to tell the 1603 // difference between a function that really doesn't have a calling 1604 // convention and one that is declared cdecl. That's because in 1605 // canonicalization (see ASTContext.cpp), cdecl is canonicalized away 1606 // because it is the default calling convention. 1607 // 1608 // Note also that we DO NOT return at this point, because we still have 1609 // other tests to run. 1610 const FunctionType *OldType = cast<FunctionType>(OldQType); 1611 const FunctionType *NewType = New->getType()->getAs<FunctionType>(); 1612 FunctionType::ExtInfo OldTypeInfo = OldType->getExtInfo(); 1613 FunctionType::ExtInfo NewTypeInfo = NewType->getExtInfo(); 1614 bool RequiresAdjustment = false; 1615 if (OldTypeInfo.getCC() != CC_Default && 1616 NewTypeInfo.getCC() == CC_Default) { 1617 NewTypeInfo = NewTypeInfo.withCallingConv(OldTypeInfo.getCC()); 1618 RequiresAdjustment = true; 1619 } else if (!Context.isSameCallConv(OldTypeInfo.getCC(), 1620 NewTypeInfo.getCC())) { 1621 // Calling conventions really aren't compatible, so complain. 1622 Diag(New->getLocation(), diag::err_cconv_change) 1623 << FunctionType::getNameForCallConv(NewTypeInfo.getCC()) 1624 << (OldTypeInfo.getCC() == CC_Default) 1625 << (OldTypeInfo.getCC() == CC_Default ? "" : 1626 FunctionType::getNameForCallConv(OldTypeInfo.getCC())); 1627 Diag(Old->getLocation(), diag::note_previous_declaration); 1628 return true; 1629 } 1630 1631 // FIXME: diagnose the other way around? 1632 if (OldTypeInfo.getNoReturn() && !NewTypeInfo.getNoReturn()) { 1633 NewTypeInfo = NewTypeInfo.withNoReturn(true); 1634 RequiresAdjustment = true; 1635 } 1636 1637 // Merge regparm attribute. 1638 if (OldTypeInfo.getHasRegParm() != NewTypeInfo.getHasRegParm() || 1639 OldTypeInfo.getRegParm() != NewTypeInfo.getRegParm()) { 1640 if (NewTypeInfo.getHasRegParm()) { 1641 Diag(New->getLocation(), diag::err_regparm_mismatch) 1642 << NewType->getRegParmType() 1643 << OldType->getRegParmType(); 1644 Diag(Old->getLocation(), diag::note_previous_declaration); 1645 return true; 1646 } 1647 1648 NewTypeInfo = NewTypeInfo.withRegParm(OldTypeInfo.getRegParm()); 1649 RequiresAdjustment = true; 1650 } 1651 1652 if (RequiresAdjustment) { 1653 NewType = Context.adjustFunctionType(NewType, NewTypeInfo); 1654 New->setType(QualType(NewType, 0)); 1655 NewQType = Context.getCanonicalType(New->getType()); 1656 } 1657 1658 if (getLangOptions().CPlusPlus) { 1659 // (C++98 13.1p2): 1660 // Certain function declarations cannot be overloaded: 1661 // -- Function declarations that differ only in the return type 1662 // cannot be overloaded. 1663 QualType OldReturnType = OldType->getResultType(); 1664 QualType NewReturnType = cast<FunctionType>(NewQType)->getResultType(); 1665 QualType ResQT; 1666 if (OldReturnType != NewReturnType) { 1667 if (NewReturnType->isObjCObjectPointerType() 1668 && OldReturnType->isObjCObjectPointerType()) 1669 ResQT = Context.mergeObjCGCQualifiers(NewQType, OldQType); 1670 if (ResQT.isNull()) { 1671 if (New->isCXXClassMember() && New->isOutOfLine()) 1672 Diag(New->getLocation(), 1673 diag::err_member_def_does_not_match_ret_type) << New; 1674 else 1675 Diag(New->getLocation(), diag::err_ovl_diff_return_type); 1676 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1677 return true; 1678 } 1679 else 1680 NewQType = ResQT; 1681 } 1682 1683 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 1684 CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 1685 if (OldMethod && NewMethod) { 1686 // Preserve triviality. 1687 NewMethod->setTrivial(OldMethod->isTrivial()); 1688 1689 bool isFriend = NewMethod->getFriendObjectKind(); 1690 1691 if (!isFriend && NewMethod->getLexicalDeclContext()->isRecord()) { 1692 // -- Member function declarations with the same name and the 1693 // same parameter types cannot be overloaded if any of them 1694 // is a static member function declaration. 1695 if (OldMethod->isStatic() || NewMethod->isStatic()) { 1696 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 1697 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1698 return true; 1699 } 1700 1701 // C++ [class.mem]p1: 1702 // [...] A member shall not be declared twice in the 1703 // member-specification, except that a nested class or member 1704 // class template can be declared and then later defined. 1705 unsigned NewDiag; 1706 if (isa<CXXConstructorDecl>(OldMethod)) 1707 NewDiag = diag::err_constructor_redeclared; 1708 else if (isa<CXXDestructorDecl>(NewMethod)) 1709 NewDiag = diag::err_destructor_redeclared; 1710 else if (isa<CXXConversionDecl>(NewMethod)) 1711 NewDiag = diag::err_conv_function_redeclared; 1712 else 1713 NewDiag = diag::err_member_redeclared; 1714 1715 Diag(New->getLocation(), NewDiag); 1716 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1717 1718 // Complain if this is an explicit declaration of a special 1719 // member that was initially declared implicitly. 1720 // 1721 // As an exception, it's okay to befriend such methods in order 1722 // to permit the implicit constructor/destructor/operator calls. 1723 } else if (OldMethod->isImplicit()) { 1724 if (isFriend) { 1725 NewMethod->setImplicit(); 1726 } else { 1727 Diag(NewMethod->getLocation(), 1728 diag::err_definition_of_implicitly_declared_member) 1729 << New << getSpecialMember(OldMethod); 1730 return true; 1731 } 1732 } else if (OldMethod->isExplicitlyDefaulted()) { 1733 Diag(NewMethod->getLocation(), 1734 diag::err_definition_of_explicitly_defaulted_member) 1735 << getSpecialMember(OldMethod); 1736 return true; 1737 } 1738 } 1739 1740 // (C++98 8.3.5p3): 1741 // All declarations for a function shall agree exactly in both the 1742 // return type and the parameter-type-list. 1743 // We also want to respect all the extended bits except noreturn. 1744 1745 // noreturn should now match unless the old type info didn't have it. 1746 QualType OldQTypeForComparison = OldQType; 1747 if (!OldTypeInfo.getNoReturn() && NewTypeInfo.getNoReturn()) { 1748 assert(OldQType == QualType(OldType, 0)); 1749 const FunctionType *OldTypeForComparison 1750 = Context.adjustFunctionType(OldType, OldTypeInfo.withNoReturn(true)); 1751 OldQTypeForComparison = QualType(OldTypeForComparison, 0); 1752 assert(OldQTypeForComparison.isCanonical()); 1753 } 1754 1755 if (OldQTypeForComparison == NewQType) 1756 return MergeCompatibleFunctionDecls(New, Old); 1757 1758 // Fall through for conflicting redeclarations and redefinitions. 1759 } 1760 1761 // C: Function types need to be compatible, not identical. This handles 1762 // duplicate function decls like "void f(int); void f(enum X);" properly. 1763 if (!getLangOptions().CPlusPlus && 1764 Context.typesAreCompatible(OldQType, NewQType)) { 1765 const FunctionType *OldFuncType = OldQType->getAs<FunctionType>(); 1766 const FunctionType *NewFuncType = NewQType->getAs<FunctionType>(); 1767 const FunctionProtoType *OldProto = 0; 1768 if (isa<FunctionNoProtoType>(NewFuncType) && 1769 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) { 1770 // The old declaration provided a function prototype, but the 1771 // new declaration does not. Merge in the prototype. 1772 assert(!OldProto->hasExceptionSpec() && "Exception spec in C"); 1773 llvm::SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(), 1774 OldProto->arg_type_end()); 1775 NewQType = Context.getFunctionType(NewFuncType->getResultType(), 1776 ParamTypes.data(), ParamTypes.size(), 1777 OldProto->getExtProtoInfo()); 1778 New->setType(NewQType); 1779 New->setHasInheritedPrototype(); 1780 1781 // Synthesize a parameter for each argument type. 1782 llvm::SmallVector<ParmVarDecl*, 16> Params; 1783 for (FunctionProtoType::arg_type_iterator 1784 ParamType = OldProto->arg_type_begin(), 1785 ParamEnd = OldProto->arg_type_end(); 1786 ParamType != ParamEnd; ++ParamType) { 1787 ParmVarDecl *Param = ParmVarDecl::Create(Context, New, 1788 SourceLocation(), 1789 SourceLocation(), 0, 1790 *ParamType, /*TInfo=*/0, 1791 SC_None, SC_None, 1792 0); 1793 Param->setScopeInfo(0, Params.size()); 1794 Param->setImplicit(); 1795 Params.push_back(Param); 1796 } 1797 1798 New->setParams(Params.data(), Params.size()); 1799 } 1800 1801 return MergeCompatibleFunctionDecls(New, Old); 1802 } 1803 1804 // GNU C permits a K&R definition to follow a prototype declaration 1805 // if the declared types of the parameters in the K&R definition 1806 // match the types in the prototype declaration, even when the 1807 // promoted types of the parameters from the K&R definition differ 1808 // from the types in the prototype. GCC then keeps the types from 1809 // the prototype. 1810 // 1811 // If a variadic prototype is followed by a non-variadic K&R definition, 1812 // the K&R definition becomes variadic. This is sort of an edge case, but 1813 // it's legal per the standard depending on how you read C99 6.7.5.3p15 and 1814 // C99 6.9.1p8. 1815 if (!getLangOptions().CPlusPlus && 1816 Old->hasPrototype() && !New->hasPrototype() && 1817 New->getType()->getAs<FunctionProtoType>() && 1818 Old->getNumParams() == New->getNumParams()) { 1819 llvm::SmallVector<QualType, 16> ArgTypes; 1820 llvm::SmallVector<GNUCompatibleParamWarning, 16> Warnings; 1821 const FunctionProtoType *OldProto 1822 = Old->getType()->getAs<FunctionProtoType>(); 1823 const FunctionProtoType *NewProto 1824 = New->getType()->getAs<FunctionProtoType>(); 1825 1826 // Determine whether this is the GNU C extension. 1827 QualType MergedReturn = Context.mergeTypes(OldProto->getResultType(), 1828 NewProto->getResultType()); 1829 bool LooseCompatible = !MergedReturn.isNull(); 1830 for (unsigned Idx = 0, End = Old->getNumParams(); 1831 LooseCompatible && Idx != End; ++Idx) { 1832 ParmVarDecl *OldParm = Old->getParamDecl(Idx); 1833 ParmVarDecl *NewParm = New->getParamDecl(Idx); 1834 if (Context.typesAreCompatible(OldParm->getType(), 1835 NewProto->getArgType(Idx))) { 1836 ArgTypes.push_back(NewParm->getType()); 1837 } else if (Context.typesAreCompatible(OldParm->getType(), 1838 NewParm->getType(), 1839 /*CompareUnqualified=*/true)) { 1840 GNUCompatibleParamWarning Warn 1841 = { OldParm, NewParm, NewProto->getArgType(Idx) }; 1842 Warnings.push_back(Warn); 1843 ArgTypes.push_back(NewParm->getType()); 1844 } else 1845 LooseCompatible = false; 1846 } 1847 1848 if (LooseCompatible) { 1849 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) { 1850 Diag(Warnings[Warn].NewParm->getLocation(), 1851 diag::ext_param_promoted_not_compatible_with_prototype) 1852 << Warnings[Warn].PromotedType 1853 << Warnings[Warn].OldParm->getType(); 1854 if (Warnings[Warn].OldParm->getLocation().isValid()) 1855 Diag(Warnings[Warn].OldParm->getLocation(), 1856 diag::note_previous_declaration); 1857 } 1858 1859 New->setType(Context.getFunctionType(MergedReturn, &ArgTypes[0], 1860 ArgTypes.size(), 1861 OldProto->getExtProtoInfo())); 1862 return MergeCompatibleFunctionDecls(New, Old); 1863 } 1864 1865 // Fall through to diagnose conflicting types. 1866 } 1867 1868 // A function that has already been declared has been redeclared or defined 1869 // with a different type- show appropriate diagnostic 1870 if (unsigned BuiltinID = Old->getBuiltinID()) { 1871 // The user has declared a builtin function with an incompatible 1872 // signature. 1873 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 1874 // The function the user is redeclaring is a library-defined 1875 // function like 'malloc' or 'printf'. Warn about the 1876 // redeclaration, then pretend that we don't know about this 1877 // library built-in. 1878 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; 1879 Diag(Old->getLocation(), diag::note_previous_builtin_declaration) 1880 << Old << Old->getType(); 1881 New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin); 1882 Old->setInvalidDecl(); 1883 return false; 1884 } 1885 1886 PrevDiag = diag::note_previous_builtin_declaration; 1887 } 1888 1889 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 1890 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1891 return true; 1892} 1893 1894/// \brief Completes the merge of two function declarations that are 1895/// known to be compatible. 1896/// 1897/// This routine handles the merging of attributes and other 1898/// properties of function declarations form the old declaration to 1899/// the new declaration, once we know that New is in fact a 1900/// redeclaration of Old. 1901/// 1902/// \returns false 1903bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old) { 1904 // Merge the attributes 1905 mergeDeclAttributes(New, Old, Context); 1906 1907 // Merge the storage class. 1908 if (Old->getStorageClass() != SC_Extern && 1909 Old->getStorageClass() != SC_None) 1910 New->setStorageClass(Old->getStorageClass()); 1911 1912 // Merge "pure" flag. 1913 if (Old->isPure()) 1914 New->setPure(); 1915 1916 // Merge attributes from the parameters. These can mismatch with K&R 1917 // declarations. 1918 if (New->getNumParams() == Old->getNumParams()) 1919 for (unsigned i = 0, e = New->getNumParams(); i != e; ++i) 1920 mergeParamDeclAttributes(New->getParamDecl(i), Old->getParamDecl(i), 1921 Context); 1922 1923 if (getLangOptions().CPlusPlus) 1924 return MergeCXXFunctionDecl(New, Old); 1925 1926 return false; 1927} 1928 1929void Sema::mergeObjCMethodDecls(ObjCMethodDecl *newMethod, 1930 const ObjCMethodDecl *oldMethod) { 1931 // Merge the attributes. 1932 mergeDeclAttributes(newMethod, oldMethod, Context); 1933 1934 // Merge attributes from the parameters. 1935 for (ObjCMethodDecl::param_iterator oi = oldMethod->param_begin(), 1936 ni = newMethod->param_begin(), ne = newMethod->param_end(); 1937 ni != ne; ++ni, ++oi) 1938 mergeParamDeclAttributes(*ni, *oi, Context); 1939} 1940 1941/// MergeVarDeclTypes - We parsed a variable 'New' which has the same name and 1942/// scope as a previous declaration 'Old'. Figure out how to merge their types, 1943/// emitting diagnostics as appropriate. 1944/// 1945/// Declarations using the auto type specifier (C++ [decl.spec.auto]) call back 1946/// to here in AddInitializerToDecl and AddCXXDirectInitializerToDecl. We can't 1947/// check them before the initializer is attached. 1948/// 1949void Sema::MergeVarDeclTypes(VarDecl *New, VarDecl *Old) { 1950 if (New->isInvalidDecl() || Old->isInvalidDecl()) 1951 return; 1952 1953 QualType MergedT; 1954 if (getLangOptions().CPlusPlus) { 1955 AutoType *AT = New->getType()->getContainedAutoType(); 1956 if (AT && !AT->isDeduced()) { 1957 // We don't know what the new type is until the initializer is attached. 1958 return; 1959 } else if (Context.hasSameType(New->getType(), Old->getType())) { 1960 // These could still be something that needs exception specs checked. 1961 return MergeVarDeclExceptionSpecs(New, Old); 1962 } 1963 // C++ [basic.link]p10: 1964 // [...] the types specified by all declarations referring to a given 1965 // object or function shall be identical, except that declarations for an 1966 // array object can specify array types that differ by the presence or 1967 // absence of a major array bound (8.3.4). 1968 else if (Old->getType()->isIncompleteArrayType() && 1969 New->getType()->isArrayType()) { 1970 CanQual<ArrayType> OldArray 1971 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 1972 CanQual<ArrayType> NewArray 1973 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 1974 if (OldArray->getElementType() == NewArray->getElementType()) 1975 MergedT = New->getType(); 1976 } else if (Old->getType()->isArrayType() && 1977 New->getType()->isIncompleteArrayType()) { 1978 CanQual<ArrayType> OldArray 1979 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 1980 CanQual<ArrayType> NewArray 1981 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 1982 if (OldArray->getElementType() == NewArray->getElementType()) 1983 MergedT = Old->getType(); 1984 } else if (New->getType()->isObjCObjectPointerType() 1985 && Old->getType()->isObjCObjectPointerType()) { 1986 MergedT = Context.mergeObjCGCQualifiers(New->getType(), 1987 Old->getType()); 1988 } 1989 } else { 1990 MergedT = Context.mergeTypes(New->getType(), Old->getType()); 1991 } 1992 if (MergedT.isNull()) { 1993 Diag(New->getLocation(), diag::err_redefinition_different_type) 1994 << New->getDeclName(); 1995 Diag(Old->getLocation(), diag::note_previous_definition); 1996 return New->setInvalidDecl(); 1997 } 1998 New->setType(MergedT); 1999} 2000 2001/// MergeVarDecl - We just parsed a variable 'New' which has the same name 2002/// and scope as a previous declaration 'Old'. Figure out how to resolve this 2003/// situation, merging decls or emitting diagnostics as appropriate. 2004/// 2005/// Tentative definition rules (C99 6.9.2p2) are checked by 2006/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 2007/// definitions here, since the initializer hasn't been attached. 2008/// 2009void Sema::MergeVarDecl(VarDecl *New, LookupResult &Previous) { 2010 // If the new decl is already invalid, don't do any other checking. 2011 if (New->isInvalidDecl()) 2012 return; 2013 2014 // Verify the old decl was also a variable. 2015 VarDecl *Old = 0; 2016 if (!Previous.isSingleResult() || 2017 !(Old = dyn_cast<VarDecl>(Previous.getFoundDecl()))) { 2018 Diag(New->getLocation(), diag::err_redefinition_different_kind) 2019 << New->getDeclName(); 2020 Diag(Previous.getRepresentativeDecl()->getLocation(), 2021 diag::note_previous_definition); 2022 return New->setInvalidDecl(); 2023 } 2024 2025 // C++ [class.mem]p1: 2026 // A member shall not be declared twice in the member-specification [...] 2027 // 2028 // Here, we need only consider static data members. 2029 if (Old->isStaticDataMember() && !New->isOutOfLine()) { 2030 Diag(New->getLocation(), diag::err_duplicate_member) 2031 << New->getIdentifier(); 2032 Diag(Old->getLocation(), diag::note_previous_declaration); 2033 New->setInvalidDecl(); 2034 } 2035 2036 mergeDeclAttributes(New, Old, Context); 2037 2038 // Merge the types. 2039 MergeVarDeclTypes(New, Old); 2040 if (New->isInvalidDecl()) 2041 return; 2042 2043 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 2044 if (New->getStorageClass() == SC_Static && 2045 (Old->getStorageClass() == SC_None || Old->hasExternalStorage())) { 2046 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 2047 Diag(Old->getLocation(), diag::note_previous_definition); 2048 return New->setInvalidDecl(); 2049 } 2050 // C99 6.2.2p4: 2051 // For an identifier declared with the storage-class specifier 2052 // extern in a scope in which a prior declaration of that 2053 // identifier is visible,23) if the prior declaration specifies 2054 // internal or external linkage, the linkage of the identifier at 2055 // the later declaration is the same as the linkage specified at 2056 // the prior declaration. If no prior declaration is visible, or 2057 // if the prior declaration specifies no linkage, then the 2058 // identifier has external linkage. 2059 if (New->hasExternalStorage() && Old->hasLinkage()) 2060 /* Okay */; 2061 else if (New->getStorageClass() != SC_Static && 2062 Old->getStorageClass() == SC_Static) { 2063 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 2064 Diag(Old->getLocation(), diag::note_previous_definition); 2065 return New->setInvalidDecl(); 2066 } 2067 2068 // Check if extern is followed by non-extern and vice-versa. 2069 if (New->hasExternalStorage() && 2070 !Old->hasLinkage() && Old->isLocalVarDecl()) { 2071 Diag(New->getLocation(), diag::err_extern_non_extern) << New->getDeclName(); 2072 Diag(Old->getLocation(), diag::note_previous_definition); 2073 return New->setInvalidDecl(); 2074 } 2075 if (Old->hasExternalStorage() && 2076 !New->hasLinkage() && New->isLocalVarDecl()) { 2077 Diag(New->getLocation(), diag::err_non_extern_extern) << New->getDeclName(); 2078 Diag(Old->getLocation(), diag::note_previous_definition); 2079 return New->setInvalidDecl(); 2080 } 2081 2082 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 2083 2084 // FIXME: The test for external storage here seems wrong? We still 2085 // need to check for mismatches. 2086 if (!New->hasExternalStorage() && !New->isFileVarDecl() && 2087 // Don't complain about out-of-line definitions of static members. 2088 !(Old->getLexicalDeclContext()->isRecord() && 2089 !New->getLexicalDeclContext()->isRecord())) { 2090 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 2091 Diag(Old->getLocation(), diag::note_previous_definition); 2092 return New->setInvalidDecl(); 2093 } 2094 2095 if (New->isThreadSpecified() && !Old->isThreadSpecified()) { 2096 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName(); 2097 Diag(Old->getLocation(), diag::note_previous_definition); 2098 } else if (!New->isThreadSpecified() && Old->isThreadSpecified()) { 2099 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName(); 2100 Diag(Old->getLocation(), diag::note_previous_definition); 2101 } 2102 2103 // C++ doesn't have tentative definitions, so go right ahead and check here. 2104 const VarDecl *Def; 2105 if (getLangOptions().CPlusPlus && 2106 New->isThisDeclarationADefinition() == VarDecl::Definition && 2107 (Def = Old->getDefinition())) { 2108 Diag(New->getLocation(), diag::err_redefinition) 2109 << New->getDeclName(); 2110 Diag(Def->getLocation(), diag::note_previous_definition); 2111 New->setInvalidDecl(); 2112 return; 2113 } 2114 // c99 6.2.2 P4. 2115 // For an identifier declared with the storage-class specifier extern in a 2116 // scope in which a prior declaration of that identifier is visible, if 2117 // the prior declaration specifies internal or external linkage, the linkage 2118 // of the identifier at the later declaration is the same as the linkage 2119 // specified at the prior declaration. 2120 // FIXME. revisit this code. 2121 if (New->hasExternalStorage() && 2122 Old->getLinkage() == InternalLinkage && 2123 New->getDeclContext() == Old->getDeclContext()) 2124 New->setStorageClass(Old->getStorageClass()); 2125 2126 // Keep a chain of previous declarations. 2127 New->setPreviousDeclaration(Old); 2128 2129 // Inherit access appropriately. 2130 New->setAccess(Old->getAccess()); 2131} 2132 2133/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2134/// no declarator (e.g. "struct foo;") is parsed. 2135Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2136 DeclSpec &DS) { 2137 return ParsedFreeStandingDeclSpec(S, AS, DS, 2138 MultiTemplateParamsArg(*this, 0, 0)); 2139} 2140 2141/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2142/// no declarator (e.g. "struct foo;") is parsed. It also accopts template 2143/// parameters to cope with template friend declarations. 2144Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2145 DeclSpec &DS, 2146 MultiTemplateParamsArg TemplateParams) { 2147 Decl *TagD = 0; 2148 TagDecl *Tag = 0; 2149 if (DS.getTypeSpecType() == DeclSpec::TST_class || 2150 DS.getTypeSpecType() == DeclSpec::TST_struct || 2151 DS.getTypeSpecType() == DeclSpec::TST_union || 2152 DS.getTypeSpecType() == DeclSpec::TST_enum) { 2153 TagD = DS.getRepAsDecl(); 2154 2155 if (!TagD) // We probably had an error 2156 return 0; 2157 2158 // Note that the above type specs guarantee that the 2159 // type rep is a Decl, whereas in many of the others 2160 // it's a Type. 2161 Tag = dyn_cast<TagDecl>(TagD); 2162 } 2163 2164 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 2165 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 2166 // or incomplete types shall not be restrict-qualified." 2167 if (TypeQuals & DeclSpec::TQ_restrict) 2168 Diag(DS.getRestrictSpecLoc(), 2169 diag::err_typecheck_invalid_restrict_not_pointer_noarg) 2170 << DS.getSourceRange(); 2171 } 2172 2173 if (DS.isFriendSpecified()) { 2174 // If we're dealing with a decl but not a TagDecl, assume that 2175 // whatever routines created it handled the friendship aspect. 2176 if (TagD && !Tag) 2177 return 0; 2178 return ActOnFriendTypeDecl(S, DS, TemplateParams); 2179 } 2180 2181 // Track whether we warned about the fact that there aren't any 2182 // declarators. 2183 bool emittedWarning = false; 2184 2185 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 2186 ProcessDeclAttributeList(S, Record, DS.getAttributes().getList()); 2187 2188 if (!Record->getDeclName() && Record->isDefinition() && 2189 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { 2190 if (getLangOptions().CPlusPlus || 2191 Record->getDeclContext()->isRecord()) 2192 return BuildAnonymousStructOrUnion(S, DS, AS, Record); 2193 2194 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 2195 << DS.getSourceRange(); 2196 emittedWarning = true; 2197 } 2198 } 2199 2200 // Check for Microsoft C extension: anonymous struct. 2201 if (getLangOptions().Microsoft && !getLangOptions().CPlusPlus && 2202 CurContext->isRecord() && 2203 DS.getStorageClassSpec() == DeclSpec::SCS_unspecified) { 2204 // Handle 2 kinds of anonymous struct: 2205 // struct STRUCT; 2206 // and 2207 // STRUCT_TYPE; <- where STRUCT_TYPE is a typedef struct. 2208 RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag); 2209 if ((Record && Record->getDeclName() && !Record->isDefinition()) || 2210 (DS.getTypeSpecType() == DeclSpec::TST_typename && 2211 DS.getRepAsType().get()->isStructureType())) { 2212 Diag(DS.getSourceRange().getBegin(), diag::ext_ms_anonymous_struct) 2213 << DS.getSourceRange(); 2214 return BuildMicrosoftCAnonymousStruct(S, DS, Record); 2215 } 2216 } 2217 2218 if (getLangOptions().CPlusPlus && 2219 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) 2220 if (EnumDecl *Enum = dyn_cast_or_null<EnumDecl>(Tag)) 2221 if (Enum->enumerator_begin() == Enum->enumerator_end() && 2222 !Enum->getIdentifier() && !Enum->isInvalidDecl()) { 2223 Diag(Enum->getLocation(), diag::ext_no_declarators) 2224 << DS.getSourceRange(); 2225 emittedWarning = true; 2226 } 2227 2228 // Skip all the checks below if we have a type error. 2229 if (DS.getTypeSpecType() == DeclSpec::TST_error) return TagD; 2230 2231 if (!DS.isMissingDeclaratorOk()) { 2232 // Warn about typedefs of enums without names, since this is an 2233 // extension in both Microsoft and GNU. 2234 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 2235 Tag && isa<EnumDecl>(Tag)) { 2236 Diag(DS.getSourceRange().getBegin(), diag::ext_typedef_without_a_name) 2237 << DS.getSourceRange(); 2238 return Tag; 2239 } 2240 2241 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 2242 << DS.getSourceRange(); 2243 emittedWarning = true; 2244 } 2245 2246 // We're going to complain about a bunch of spurious specifiers; 2247 // only do this if we're declaring a tag, because otherwise we 2248 // should be getting diag::ext_no_declarators. 2249 if (emittedWarning || (TagD && TagD->isInvalidDecl())) 2250 return TagD; 2251 2252 // Note that a linkage-specification sets a storage class, but 2253 // 'extern "C" struct foo;' is actually valid and not theoretically 2254 // useless. 2255 if (DeclSpec::SCS scs = DS.getStorageClassSpec()) 2256 if (!DS.isExternInLinkageSpec()) 2257 Diag(DS.getStorageClassSpecLoc(), diag::warn_standalone_specifier) 2258 << DeclSpec::getSpecifierName(scs); 2259 2260 if (DS.isThreadSpecified()) 2261 Diag(DS.getThreadSpecLoc(), diag::warn_standalone_specifier) << "__thread"; 2262 if (DS.getTypeQualifiers()) { 2263 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2264 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "const"; 2265 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2266 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "volatile"; 2267 // Restrict is covered above. 2268 } 2269 if (DS.isInlineSpecified()) 2270 Diag(DS.getInlineSpecLoc(), diag::warn_standalone_specifier) << "inline"; 2271 if (DS.isVirtualSpecified()) 2272 Diag(DS.getVirtualSpecLoc(), diag::warn_standalone_specifier) << "virtual"; 2273 if (DS.isExplicitSpecified()) 2274 Diag(DS.getExplicitSpecLoc(), diag::warn_standalone_specifier) <<"explicit"; 2275 2276 // FIXME: Warn on useless attributes 2277 2278 return TagD; 2279} 2280 2281/// ActOnVlaStmt - This rouine if finds a vla expression in a decl spec. 2282/// builds a statement for it and returns it so it is evaluated. 2283StmtResult Sema::ActOnVlaStmt(const DeclSpec &DS) { 2284 StmtResult R; 2285 if (DS.getTypeSpecType() == DeclSpec::TST_typeofExpr) { 2286 Expr *Exp = DS.getRepAsExpr(); 2287 QualType Ty = Exp->getType(); 2288 if (Ty->isPointerType()) { 2289 do 2290 Ty = Ty->getAs<PointerType>()->getPointeeType(); 2291 while (Ty->isPointerType()); 2292 } 2293 if (Ty->isVariableArrayType()) { 2294 R = ActOnExprStmt(MakeFullExpr(Exp)); 2295 } 2296 } 2297 return R; 2298} 2299 2300/// We are trying to inject an anonymous member into the given scope; 2301/// check if there's an existing declaration that can't be overloaded. 2302/// 2303/// \return true if this is a forbidden redeclaration 2304static bool CheckAnonMemberRedeclaration(Sema &SemaRef, 2305 Scope *S, 2306 DeclContext *Owner, 2307 DeclarationName Name, 2308 SourceLocation NameLoc, 2309 unsigned diagnostic) { 2310 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupMemberName, 2311 Sema::ForRedeclaration); 2312 if (!SemaRef.LookupName(R, S)) return false; 2313 2314 if (R.getAsSingle<TagDecl>()) 2315 return false; 2316 2317 // Pick a representative declaration. 2318 NamedDecl *PrevDecl = R.getRepresentativeDecl()->getUnderlyingDecl(); 2319 assert(PrevDecl && "Expected a non-null Decl"); 2320 2321 if (!SemaRef.isDeclInScope(PrevDecl, Owner, S)) 2322 return false; 2323 2324 SemaRef.Diag(NameLoc, diagnostic) << Name; 2325 SemaRef.Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 2326 2327 return true; 2328} 2329 2330/// InjectAnonymousStructOrUnionMembers - Inject the members of the 2331/// anonymous struct or union AnonRecord into the owning context Owner 2332/// and scope S. This routine will be invoked just after we realize 2333/// that an unnamed union or struct is actually an anonymous union or 2334/// struct, e.g., 2335/// 2336/// @code 2337/// union { 2338/// int i; 2339/// float f; 2340/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 2341/// // f into the surrounding scope.x 2342/// @endcode 2343/// 2344/// This routine is recursive, injecting the names of nested anonymous 2345/// structs/unions into the owning context and scope as well. 2346static bool InjectAnonymousStructOrUnionMembers(Sema &SemaRef, Scope *S, 2347 DeclContext *Owner, 2348 RecordDecl *AnonRecord, 2349 AccessSpecifier AS, 2350 llvm::SmallVector<NamedDecl*, 2> &Chaining, 2351 bool MSAnonStruct) { 2352 unsigned diagKind 2353 = AnonRecord->isUnion() ? diag::err_anonymous_union_member_redecl 2354 : diag::err_anonymous_struct_member_redecl; 2355 2356 bool Invalid = false; 2357 2358 // Look every FieldDecl and IndirectFieldDecl with a name. 2359 for (RecordDecl::decl_iterator D = AnonRecord->decls_begin(), 2360 DEnd = AnonRecord->decls_end(); 2361 D != DEnd; ++D) { 2362 if ((isa<FieldDecl>(*D) || isa<IndirectFieldDecl>(*D)) && 2363 cast<NamedDecl>(*D)->getDeclName()) { 2364 ValueDecl *VD = cast<ValueDecl>(*D); 2365 if (CheckAnonMemberRedeclaration(SemaRef, S, Owner, VD->getDeclName(), 2366 VD->getLocation(), diagKind)) { 2367 // C++ [class.union]p2: 2368 // The names of the members of an anonymous union shall be 2369 // distinct from the names of any other entity in the 2370 // scope in which the anonymous union is declared. 2371 Invalid = true; 2372 } else { 2373 // C++ [class.union]p2: 2374 // For the purpose of name lookup, after the anonymous union 2375 // definition, the members of the anonymous union are 2376 // considered to have been defined in the scope in which the 2377 // anonymous union is declared. 2378 unsigned OldChainingSize = Chaining.size(); 2379 if (IndirectFieldDecl *IF = dyn_cast<IndirectFieldDecl>(VD)) 2380 for (IndirectFieldDecl::chain_iterator PI = IF->chain_begin(), 2381 PE = IF->chain_end(); PI != PE; ++PI) 2382 Chaining.push_back(*PI); 2383 else 2384 Chaining.push_back(VD); 2385 2386 assert(Chaining.size() >= 2); 2387 NamedDecl **NamedChain = 2388 new (SemaRef.Context)NamedDecl*[Chaining.size()]; 2389 for (unsigned i = 0; i < Chaining.size(); i++) 2390 NamedChain[i] = Chaining[i]; 2391 2392 IndirectFieldDecl* IndirectField = 2393 IndirectFieldDecl::Create(SemaRef.Context, Owner, VD->getLocation(), 2394 VD->getIdentifier(), VD->getType(), 2395 NamedChain, Chaining.size()); 2396 2397 IndirectField->setAccess(AS); 2398 IndirectField->setImplicit(); 2399 SemaRef.PushOnScopeChains(IndirectField, S); 2400 2401 // That includes picking up the appropriate access specifier. 2402 if (AS != AS_none) IndirectField->setAccess(AS); 2403 2404 Chaining.resize(OldChainingSize); 2405 } 2406 } 2407 } 2408 2409 return Invalid; 2410} 2411 2412/// StorageClassSpecToVarDeclStorageClass - Maps a DeclSpec::SCS to 2413/// a VarDecl::StorageClass. Any error reporting is up to the caller: 2414/// illegal input values are mapped to SC_None. 2415static StorageClass 2416StorageClassSpecToVarDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2417 switch (StorageClassSpec) { 2418 case DeclSpec::SCS_unspecified: return SC_None; 2419 case DeclSpec::SCS_extern: return SC_Extern; 2420 case DeclSpec::SCS_static: return SC_Static; 2421 case DeclSpec::SCS_auto: return SC_Auto; 2422 case DeclSpec::SCS_register: return SC_Register; 2423 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2424 // Illegal SCSs map to None: error reporting is up to the caller. 2425 case DeclSpec::SCS_mutable: // Fall through. 2426 case DeclSpec::SCS_typedef: return SC_None; 2427 } 2428 llvm_unreachable("unknown storage class specifier"); 2429} 2430 2431/// StorageClassSpecToFunctionDeclStorageClass - Maps a DeclSpec::SCS to 2432/// a StorageClass. Any error reporting is up to the caller: 2433/// illegal input values are mapped to SC_None. 2434static StorageClass 2435StorageClassSpecToFunctionDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2436 switch (StorageClassSpec) { 2437 case DeclSpec::SCS_unspecified: return SC_None; 2438 case DeclSpec::SCS_extern: return SC_Extern; 2439 case DeclSpec::SCS_static: return SC_Static; 2440 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2441 // Illegal SCSs map to None: error reporting is up to the caller. 2442 case DeclSpec::SCS_auto: // Fall through. 2443 case DeclSpec::SCS_mutable: // Fall through. 2444 case DeclSpec::SCS_register: // Fall through. 2445 case DeclSpec::SCS_typedef: return SC_None; 2446 } 2447 llvm_unreachable("unknown storage class specifier"); 2448} 2449 2450/// BuildAnonymousStructOrUnion - Handle the declaration of an 2451/// anonymous structure or union. Anonymous unions are a C++ feature 2452/// (C++ [class.union]) and a GNU C extension; anonymous structures 2453/// are a GNU C and GNU C++ extension. 2454Decl *Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 2455 AccessSpecifier AS, 2456 RecordDecl *Record) { 2457 DeclContext *Owner = Record->getDeclContext(); 2458 2459 // Diagnose whether this anonymous struct/union is an extension. 2460 if (Record->isUnion() && !getLangOptions().CPlusPlus) 2461 Diag(Record->getLocation(), diag::ext_anonymous_union); 2462 else if (!Record->isUnion()) 2463 Diag(Record->getLocation(), diag::ext_anonymous_struct); 2464 2465 // C and C++ require different kinds of checks for anonymous 2466 // structs/unions. 2467 bool Invalid = false; 2468 if (getLangOptions().CPlusPlus) { 2469 const char* PrevSpec = 0; 2470 unsigned DiagID; 2471 // C++ [class.union]p3: 2472 // Anonymous unions declared in a named namespace or in the 2473 // global namespace shall be declared static. 2474 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 2475 (isa<TranslationUnitDecl>(Owner) || 2476 (isa<NamespaceDecl>(Owner) && 2477 cast<NamespaceDecl>(Owner)->getDeclName()))) { 2478 Diag(Record->getLocation(), diag::err_anonymous_union_not_static); 2479 Invalid = true; 2480 2481 // Recover by adding 'static'. 2482 DS.SetStorageClassSpec(DeclSpec::SCS_static, SourceLocation(), 2483 PrevSpec, DiagID, getLangOptions()); 2484 } 2485 // C++ [class.union]p3: 2486 // A storage class is not allowed in a declaration of an 2487 // anonymous union in a class scope. 2488 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 2489 isa<RecordDecl>(Owner)) { 2490 Diag(DS.getStorageClassSpecLoc(), 2491 diag::err_anonymous_union_with_storage_spec); 2492 Invalid = true; 2493 2494 // Recover by removing the storage specifier. 2495 DS.SetStorageClassSpec(DeclSpec::SCS_unspecified, SourceLocation(), 2496 PrevSpec, DiagID, getLangOptions()); 2497 } 2498 2499 // Ignore const/volatile/restrict qualifiers. 2500 if (DS.getTypeQualifiers()) { 2501 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2502 Diag(DS.getConstSpecLoc(), diag::ext_anonymous_struct_union_qualified) 2503 << Record->isUnion() << 0 2504 << FixItHint::CreateRemoval(DS.getConstSpecLoc()); 2505 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2506 Diag(DS.getVolatileSpecLoc(), diag::ext_anonymous_struct_union_qualified) 2507 << Record->isUnion() << 1 2508 << FixItHint::CreateRemoval(DS.getVolatileSpecLoc()); 2509 if (DS.getTypeQualifiers() & DeclSpec::TQ_restrict) 2510 Diag(DS.getRestrictSpecLoc(), diag::ext_anonymous_struct_union_qualified) 2511 << Record->isUnion() << 2 2512 << FixItHint::CreateRemoval(DS.getRestrictSpecLoc()); 2513 2514 DS.ClearTypeQualifiers(); 2515 } 2516 2517 // C++ [class.union]p2: 2518 // The member-specification of an anonymous union shall only 2519 // define non-static data members. [Note: nested types and 2520 // functions cannot be declared within an anonymous union. ] 2521 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 2522 MemEnd = Record->decls_end(); 2523 Mem != MemEnd; ++Mem) { 2524 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 2525 // C++ [class.union]p3: 2526 // An anonymous union shall not have private or protected 2527 // members (clause 11). 2528 assert(FD->getAccess() != AS_none); 2529 if (FD->getAccess() != AS_public) { 2530 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 2531 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 2532 Invalid = true; 2533 } 2534 2535 // C++ [class.union]p1 2536 // An object of a class with a non-trivial constructor, a non-trivial 2537 // copy constructor, a non-trivial destructor, or a non-trivial copy 2538 // assignment operator cannot be a member of a union, nor can an 2539 // array of such objects. 2540 if (!getLangOptions().CPlusPlus0x && CheckNontrivialField(FD)) 2541 Invalid = true; 2542 } else if ((*Mem)->isImplicit()) { 2543 // Any implicit members are fine. 2544 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 2545 // This is a type that showed up in an 2546 // elaborated-type-specifier inside the anonymous struct or 2547 // union, but which actually declares a type outside of the 2548 // anonymous struct or union. It's okay. 2549 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 2550 if (!MemRecord->isAnonymousStructOrUnion() && 2551 MemRecord->getDeclName()) { 2552 // Visual C++ allows type definition in anonymous struct or union. 2553 if (getLangOptions().Microsoft) 2554 Diag(MemRecord->getLocation(), diag::ext_anonymous_record_with_type) 2555 << (int)Record->isUnion(); 2556 else { 2557 // This is a nested type declaration. 2558 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 2559 << (int)Record->isUnion(); 2560 Invalid = true; 2561 } 2562 } 2563 } else if (isa<AccessSpecDecl>(*Mem)) { 2564 // Any access specifier is fine. 2565 } else { 2566 // We have something that isn't a non-static data 2567 // member. Complain about it. 2568 unsigned DK = diag::err_anonymous_record_bad_member; 2569 if (isa<TypeDecl>(*Mem)) 2570 DK = diag::err_anonymous_record_with_type; 2571 else if (isa<FunctionDecl>(*Mem)) 2572 DK = diag::err_anonymous_record_with_function; 2573 else if (isa<VarDecl>(*Mem)) 2574 DK = diag::err_anonymous_record_with_static; 2575 2576 // Visual C++ allows type definition in anonymous struct or union. 2577 if (getLangOptions().Microsoft && 2578 DK == diag::err_anonymous_record_with_type) 2579 Diag((*Mem)->getLocation(), diag::ext_anonymous_record_with_type) 2580 << (int)Record->isUnion(); 2581 else { 2582 Diag((*Mem)->getLocation(), DK) 2583 << (int)Record->isUnion(); 2584 Invalid = true; 2585 } 2586 } 2587 } 2588 } 2589 2590 if (!Record->isUnion() && !Owner->isRecord()) { 2591 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 2592 << (int)getLangOptions().CPlusPlus; 2593 Invalid = true; 2594 } 2595 2596 // Mock up a declarator. 2597 Declarator Dc(DS, Declarator::TypeNameContext); 2598 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2599 assert(TInfo && "couldn't build declarator info for anonymous struct/union"); 2600 2601 // Create a declaration for this anonymous struct/union. 2602 NamedDecl *Anon = 0; 2603 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 2604 Anon = FieldDecl::Create(Context, OwningClass, 2605 DS.getSourceRange().getBegin(), 2606 Record->getLocation(), 2607 /*IdentifierInfo=*/0, 2608 Context.getTypeDeclType(Record), 2609 TInfo, 2610 /*BitWidth=*/0, /*Mutable=*/false); 2611 Anon->setAccess(AS); 2612 if (getLangOptions().CPlusPlus) 2613 FieldCollector->Add(cast<FieldDecl>(Anon)); 2614 } else { 2615 DeclSpec::SCS SCSpec = DS.getStorageClassSpec(); 2616 assert(SCSpec != DeclSpec::SCS_typedef && 2617 "Parser allowed 'typedef' as storage class VarDecl."); 2618 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 2619 if (SCSpec == DeclSpec::SCS_mutable) { 2620 // mutable can only appear on non-static class members, so it's always 2621 // an error here 2622 Diag(Record->getLocation(), diag::err_mutable_nonmember); 2623 Invalid = true; 2624 SC = SC_None; 2625 } 2626 SCSpec = DS.getStorageClassSpecAsWritten(); 2627 VarDecl::StorageClass SCAsWritten 2628 = StorageClassSpecToVarDeclStorageClass(SCSpec); 2629 2630 Anon = VarDecl::Create(Context, Owner, 2631 DS.getSourceRange().getBegin(), 2632 Record->getLocation(), /*IdentifierInfo=*/0, 2633 Context.getTypeDeclType(Record), 2634 TInfo, SC, SCAsWritten); 2635 } 2636 Anon->setImplicit(); 2637 2638 // Add the anonymous struct/union object to the current 2639 // context. We'll be referencing this object when we refer to one of 2640 // its members. 2641 Owner->addDecl(Anon); 2642 2643 // Inject the members of the anonymous struct/union into the owning 2644 // context and into the identifier resolver chain for name lookup 2645 // purposes. 2646 llvm::SmallVector<NamedDecl*, 2> Chain; 2647 Chain.push_back(Anon); 2648 2649 if (InjectAnonymousStructOrUnionMembers(*this, S, Owner, Record, AS, 2650 Chain, false)) 2651 Invalid = true; 2652 2653 // Mark this as an anonymous struct/union type. Note that we do not 2654 // do this until after we have already checked and injected the 2655 // members of this anonymous struct/union type, because otherwise 2656 // the members could be injected twice: once by DeclContext when it 2657 // builds its lookup table, and once by 2658 // InjectAnonymousStructOrUnionMembers. 2659 Record->setAnonymousStructOrUnion(true); 2660 2661 if (Invalid) 2662 Anon->setInvalidDecl(); 2663 2664 return Anon; 2665} 2666 2667/// BuildMicrosoftCAnonymousStruct - Handle the declaration of an 2668/// Microsoft C anonymous structure. 2669/// Ref: http://msdn.microsoft.com/en-us/library/z2cx9y4f.aspx 2670/// Example: 2671/// 2672/// struct A { int a; }; 2673/// struct B { struct A; int b; }; 2674/// 2675/// void foo() { 2676/// B var; 2677/// var.a = 3; 2678/// } 2679/// 2680Decl *Sema::BuildMicrosoftCAnonymousStruct(Scope *S, DeclSpec &DS, 2681 RecordDecl *Record) { 2682 2683 // If there is no Record, get the record via the typedef. 2684 if (!Record) 2685 Record = DS.getRepAsType().get()->getAsStructureType()->getDecl(); 2686 2687 // Mock up a declarator. 2688 Declarator Dc(DS, Declarator::TypeNameContext); 2689 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2690 assert(TInfo && "couldn't build declarator info for anonymous struct"); 2691 2692 // Create a declaration for this anonymous struct. 2693 NamedDecl* Anon = FieldDecl::Create(Context, 2694 cast<RecordDecl>(CurContext), 2695 DS.getSourceRange().getBegin(), 2696 DS.getSourceRange().getBegin(), 2697 /*IdentifierInfo=*/0, 2698 Context.getTypeDeclType(Record), 2699 TInfo, 2700 /*BitWidth=*/0, /*Mutable=*/false); 2701 Anon->setImplicit(); 2702 2703 // Add the anonymous struct object to the current context. 2704 CurContext->addDecl(Anon); 2705 2706 // Inject the members of the anonymous struct into the current 2707 // context and into the identifier resolver chain for name lookup 2708 // purposes. 2709 llvm::SmallVector<NamedDecl*, 2> Chain; 2710 Chain.push_back(Anon); 2711 2712 if (InjectAnonymousStructOrUnionMembers(*this, S, CurContext, 2713 Record->getDefinition(), 2714 AS_none, Chain, true)) 2715 Anon->setInvalidDecl(); 2716 2717 return Anon; 2718} 2719 2720/// GetNameForDeclarator - Determine the full declaration name for the 2721/// given Declarator. 2722DeclarationNameInfo Sema::GetNameForDeclarator(Declarator &D) { 2723 return GetNameFromUnqualifiedId(D.getName()); 2724} 2725 2726/// \brief Retrieves the declaration name from a parsed unqualified-id. 2727DeclarationNameInfo 2728Sema::GetNameFromUnqualifiedId(const UnqualifiedId &Name) { 2729 DeclarationNameInfo NameInfo; 2730 NameInfo.setLoc(Name.StartLocation); 2731 2732 switch (Name.getKind()) { 2733 2734 case UnqualifiedId::IK_Identifier: 2735 NameInfo.setName(Name.Identifier); 2736 NameInfo.setLoc(Name.StartLocation); 2737 return NameInfo; 2738 2739 case UnqualifiedId::IK_OperatorFunctionId: 2740 NameInfo.setName(Context.DeclarationNames.getCXXOperatorName( 2741 Name.OperatorFunctionId.Operator)); 2742 NameInfo.setLoc(Name.StartLocation); 2743 NameInfo.getInfo().CXXOperatorName.BeginOpNameLoc 2744 = Name.OperatorFunctionId.SymbolLocations[0]; 2745 NameInfo.getInfo().CXXOperatorName.EndOpNameLoc 2746 = Name.EndLocation.getRawEncoding(); 2747 return NameInfo; 2748 2749 case UnqualifiedId::IK_LiteralOperatorId: 2750 NameInfo.setName(Context.DeclarationNames.getCXXLiteralOperatorName( 2751 Name.Identifier)); 2752 NameInfo.setLoc(Name.StartLocation); 2753 NameInfo.setCXXLiteralOperatorNameLoc(Name.EndLocation); 2754 return NameInfo; 2755 2756 case UnqualifiedId::IK_ConversionFunctionId: { 2757 TypeSourceInfo *TInfo; 2758 QualType Ty = GetTypeFromParser(Name.ConversionFunctionId, &TInfo); 2759 if (Ty.isNull()) 2760 return DeclarationNameInfo(); 2761 NameInfo.setName(Context.DeclarationNames.getCXXConversionFunctionName( 2762 Context.getCanonicalType(Ty))); 2763 NameInfo.setLoc(Name.StartLocation); 2764 NameInfo.setNamedTypeInfo(TInfo); 2765 return NameInfo; 2766 } 2767 2768 case UnqualifiedId::IK_ConstructorName: { 2769 TypeSourceInfo *TInfo; 2770 QualType Ty = GetTypeFromParser(Name.ConstructorName, &TInfo); 2771 if (Ty.isNull()) 2772 return DeclarationNameInfo(); 2773 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 2774 Context.getCanonicalType(Ty))); 2775 NameInfo.setLoc(Name.StartLocation); 2776 NameInfo.setNamedTypeInfo(TInfo); 2777 return NameInfo; 2778 } 2779 2780 case UnqualifiedId::IK_ConstructorTemplateId: { 2781 // In well-formed code, we can only have a constructor 2782 // template-id that refers to the current context, so go there 2783 // to find the actual type being constructed. 2784 CXXRecordDecl *CurClass = dyn_cast<CXXRecordDecl>(CurContext); 2785 if (!CurClass || CurClass->getIdentifier() != Name.TemplateId->Name) 2786 return DeclarationNameInfo(); 2787 2788 // Determine the type of the class being constructed. 2789 QualType CurClassType = Context.getTypeDeclType(CurClass); 2790 2791 // FIXME: Check two things: that the template-id names the same type as 2792 // CurClassType, and that the template-id does not occur when the name 2793 // was qualified. 2794 2795 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 2796 Context.getCanonicalType(CurClassType))); 2797 NameInfo.setLoc(Name.StartLocation); 2798 // FIXME: should we retrieve TypeSourceInfo? 2799 NameInfo.setNamedTypeInfo(0); 2800 return NameInfo; 2801 } 2802 2803 case UnqualifiedId::IK_DestructorName: { 2804 TypeSourceInfo *TInfo; 2805 QualType Ty = GetTypeFromParser(Name.DestructorName, &TInfo); 2806 if (Ty.isNull()) 2807 return DeclarationNameInfo(); 2808 NameInfo.setName(Context.DeclarationNames.getCXXDestructorName( 2809 Context.getCanonicalType(Ty))); 2810 NameInfo.setLoc(Name.StartLocation); 2811 NameInfo.setNamedTypeInfo(TInfo); 2812 return NameInfo; 2813 } 2814 2815 case UnqualifiedId::IK_TemplateId: { 2816 TemplateName TName = Name.TemplateId->Template.get(); 2817 SourceLocation TNameLoc = Name.TemplateId->TemplateNameLoc; 2818 return Context.getNameForTemplate(TName, TNameLoc); 2819 } 2820 2821 } // switch (Name.getKind()) 2822 2823 assert(false && "Unknown name kind"); 2824 return DeclarationNameInfo(); 2825} 2826 2827/// isNearlyMatchingFunction - Determine whether the C++ functions 2828/// Declaration and Definition are "nearly" matching. This heuristic 2829/// is used to improve diagnostics in the case where an out-of-line 2830/// function definition doesn't match any declaration within 2831/// the class or namespace. 2832static bool isNearlyMatchingFunction(ASTContext &Context, 2833 FunctionDecl *Declaration, 2834 FunctionDecl *Definition) { 2835 if (Declaration->param_size() != Definition->param_size()) 2836 return false; 2837 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 2838 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 2839 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 2840 2841 if (!Context.hasSameUnqualifiedType(DeclParamTy.getNonReferenceType(), 2842 DefParamTy.getNonReferenceType())) 2843 return false; 2844 } 2845 2846 return true; 2847} 2848 2849/// NeedsRebuildingInCurrentInstantiation - Checks whether the given 2850/// declarator needs to be rebuilt in the current instantiation. 2851/// Any bits of declarator which appear before the name are valid for 2852/// consideration here. That's specifically the type in the decl spec 2853/// and the base type in any member-pointer chunks. 2854static bool RebuildDeclaratorInCurrentInstantiation(Sema &S, Declarator &D, 2855 DeclarationName Name) { 2856 // The types we specifically need to rebuild are: 2857 // - typenames, typeofs, and decltypes 2858 // - types which will become injected class names 2859 // Of course, we also need to rebuild any type referencing such a 2860 // type. It's safest to just say "dependent", but we call out a 2861 // few cases here. 2862 2863 DeclSpec &DS = D.getMutableDeclSpec(); 2864 switch (DS.getTypeSpecType()) { 2865 case DeclSpec::TST_typename: 2866 case DeclSpec::TST_typeofType: 2867 case DeclSpec::TST_decltype: { 2868 // Grab the type from the parser. 2869 TypeSourceInfo *TSI = 0; 2870 QualType T = S.GetTypeFromParser(DS.getRepAsType(), &TSI); 2871 if (T.isNull() || !T->isDependentType()) break; 2872 2873 // Make sure there's a type source info. This isn't really much 2874 // of a waste; most dependent types should have type source info 2875 // attached already. 2876 if (!TSI) 2877 TSI = S.Context.getTrivialTypeSourceInfo(T, DS.getTypeSpecTypeLoc()); 2878 2879 // Rebuild the type in the current instantiation. 2880 TSI = S.RebuildTypeInCurrentInstantiation(TSI, D.getIdentifierLoc(), Name); 2881 if (!TSI) return true; 2882 2883 // Store the new type back in the decl spec. 2884 ParsedType LocType = S.CreateParsedType(TSI->getType(), TSI); 2885 DS.UpdateTypeRep(LocType); 2886 break; 2887 } 2888 2889 case DeclSpec::TST_typeofExpr: { 2890 Expr *E = DS.getRepAsExpr(); 2891 ExprResult Result = S.RebuildExprInCurrentInstantiation(E); 2892 if (Result.isInvalid()) return true; 2893 DS.UpdateExprRep(Result.get()); 2894 break; 2895 } 2896 2897 default: 2898 // Nothing to do for these decl specs. 2899 break; 2900 } 2901 2902 // It doesn't matter what order we do this in. 2903 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) { 2904 DeclaratorChunk &Chunk = D.getTypeObject(I); 2905 2906 // The only type information in the declarator which can come 2907 // before the declaration name is the base type of a member 2908 // pointer. 2909 if (Chunk.Kind != DeclaratorChunk::MemberPointer) 2910 continue; 2911 2912 // Rebuild the scope specifier in-place. 2913 CXXScopeSpec &SS = Chunk.Mem.Scope(); 2914 if (S.RebuildNestedNameSpecifierInCurrentInstantiation(SS)) 2915 return true; 2916 } 2917 2918 return false; 2919} 2920 2921Decl *Sema::ActOnDeclarator(Scope *S, Declarator &D, 2922 bool IsFunctionDefinition) { 2923 return HandleDeclarator(S, D, MultiTemplateParamsArg(*this), 2924 IsFunctionDefinition); 2925} 2926 2927/// DiagnoseClassNameShadow - Implement C++ [class.mem]p13: 2928/// If T is the name of a class, then each of the following shall have a 2929/// name different from T: 2930/// - every static data member of class T; 2931/// - every member function of class T 2932/// - every member of class T that is itself a type; 2933/// \returns true if the declaration name violates these rules. 2934bool Sema::DiagnoseClassNameShadow(DeclContext *DC, 2935 DeclarationNameInfo NameInfo) { 2936 DeclarationName Name = NameInfo.getName(); 2937 2938 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(DC)) 2939 if (Record->getIdentifier() && Record->getDeclName() == Name) { 2940 Diag(NameInfo.getLoc(), diag::err_member_name_of_class) << Name; 2941 return true; 2942 } 2943 2944 return false; 2945} 2946 2947Decl *Sema::HandleDeclarator(Scope *S, Declarator &D, 2948 MultiTemplateParamsArg TemplateParamLists, 2949 bool IsFunctionDefinition) { 2950 // TODO: consider using NameInfo for diagnostic. 2951 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 2952 DeclarationName Name = NameInfo.getName(); 2953 2954 // All of these full declarators require an identifier. If it doesn't have 2955 // one, the ParsedFreeStandingDeclSpec action should be used. 2956 if (!Name) { 2957 if (!D.isInvalidType()) // Reject this if we think it is valid. 2958 Diag(D.getDeclSpec().getSourceRange().getBegin(), 2959 diag::err_declarator_need_ident) 2960 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 2961 return 0; 2962 } else if (DiagnoseUnexpandedParameterPack(NameInfo, UPPC_DeclarationType)) 2963 return 0; 2964 2965 // The scope passed in may not be a decl scope. Zip up the scope tree until 2966 // we find one that is. 2967 while ((S->getFlags() & Scope::DeclScope) == 0 || 2968 (S->getFlags() & Scope::TemplateParamScope) != 0) 2969 S = S->getParent(); 2970 2971 DeclContext *DC = CurContext; 2972 if (D.getCXXScopeSpec().isInvalid()) 2973 D.setInvalidType(); 2974 else if (D.getCXXScopeSpec().isSet()) { 2975 if (DiagnoseUnexpandedParameterPack(D.getCXXScopeSpec(), 2976 UPPC_DeclarationQualifier)) 2977 return 0; 2978 2979 bool EnteringContext = !D.getDeclSpec().isFriendSpecified(); 2980 DC = computeDeclContext(D.getCXXScopeSpec(), EnteringContext); 2981 if (!DC) { 2982 // If we could not compute the declaration context, it's because the 2983 // declaration context is dependent but does not refer to a class, 2984 // class template, or class template partial specialization. Complain 2985 // and return early, to avoid the coming semantic disaster. 2986 Diag(D.getIdentifierLoc(), 2987 diag::err_template_qualified_declarator_no_match) 2988 << (NestedNameSpecifier*)D.getCXXScopeSpec().getScopeRep() 2989 << D.getCXXScopeSpec().getRange(); 2990 return 0; 2991 } 2992 bool IsDependentContext = DC->isDependentContext(); 2993 2994 if (!IsDependentContext && 2995 RequireCompleteDeclContext(D.getCXXScopeSpec(), DC)) 2996 return 0; 2997 2998 if (isa<CXXRecordDecl>(DC)) { 2999 if (!cast<CXXRecordDecl>(DC)->hasDefinition()) { 3000 Diag(D.getIdentifierLoc(), 3001 diag::err_member_def_undefined_record) 3002 << Name << DC << D.getCXXScopeSpec().getRange(); 3003 D.setInvalidType(); 3004 } else if (isa<CXXRecordDecl>(CurContext) && 3005 !D.getDeclSpec().isFriendSpecified()) { 3006 // The user provided a superfluous scope specifier inside a class 3007 // definition: 3008 // 3009 // class X { 3010 // void X::f(); 3011 // }; 3012 if (CurContext->Equals(DC)) 3013 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 3014 << Name << FixItHint::CreateRemoval(D.getCXXScopeSpec().getRange()); 3015 else 3016 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 3017 << Name << D.getCXXScopeSpec().getRange(); 3018 3019 // Pretend that this qualifier was not here. 3020 D.getCXXScopeSpec().clear(); 3021 } 3022 } 3023 3024 // Check whether we need to rebuild the type of the given 3025 // declaration in the current instantiation. 3026 if (EnteringContext && IsDependentContext && 3027 TemplateParamLists.size() != 0) { 3028 ContextRAII SavedContext(*this, DC); 3029 if (RebuildDeclaratorInCurrentInstantiation(*this, D, Name)) 3030 D.setInvalidType(); 3031 } 3032 } 3033 3034 if (DiagnoseClassNameShadow(DC, NameInfo)) 3035 // If this is a typedef, we'll end up spewing multiple diagnostics. 3036 // Just return early; it's safer. 3037 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3038 return 0; 3039 3040 NamedDecl *New; 3041 3042 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 3043 QualType R = TInfo->getType(); 3044 3045 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 3046 UPPC_DeclarationType)) 3047 D.setInvalidType(); 3048 3049 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 3050 ForRedeclaration); 3051 3052 // See if this is a redefinition of a variable in the same scope. 3053 if (!D.getCXXScopeSpec().isSet()) { 3054 bool IsLinkageLookup = false; 3055 3056 // If the declaration we're planning to build will be a function 3057 // or object with linkage, then look for another declaration with 3058 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 3059 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3060 /* Do nothing*/; 3061 else if (R->isFunctionType()) { 3062 if (CurContext->isFunctionOrMethod() || 3063 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3064 IsLinkageLookup = true; 3065 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 3066 IsLinkageLookup = true; 3067 else if (CurContext->getRedeclContext()->isTranslationUnit() && 3068 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3069 IsLinkageLookup = true; 3070 3071 if (IsLinkageLookup) 3072 Previous.clear(LookupRedeclarationWithLinkage); 3073 3074 LookupName(Previous, S, /* CreateBuiltins = */ IsLinkageLookup); 3075 } else { // Something like "int foo::x;" 3076 LookupQualifiedName(Previous, DC); 3077 3078 // Don't consider using declarations as previous declarations for 3079 // out-of-line members. 3080 RemoveUsingDecls(Previous); 3081 3082 // C++ 7.3.1.2p2: 3083 // Members (including explicit specializations of templates) of a named 3084 // namespace can also be defined outside that namespace by explicit 3085 // qualification of the name being defined, provided that the entity being 3086 // defined was already declared in the namespace and the definition appears 3087 // after the point of declaration in a namespace that encloses the 3088 // declarations namespace. 3089 // 3090 // Note that we only check the context at this point. We don't yet 3091 // have enough information to make sure that PrevDecl is actually 3092 // the declaration we want to match. For example, given: 3093 // 3094 // class X { 3095 // void f(); 3096 // void f(float); 3097 // }; 3098 // 3099 // void X::f(int) { } // ill-formed 3100 // 3101 // In this case, PrevDecl will point to the overload set 3102 // containing the two f's declared in X, but neither of them 3103 // matches. 3104 3105 // First check whether we named the global scope. 3106 if (isa<TranslationUnitDecl>(DC)) { 3107 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 3108 << Name << D.getCXXScopeSpec().getRange(); 3109 } else { 3110 DeclContext *Cur = CurContext; 3111 while (isa<LinkageSpecDecl>(Cur)) 3112 Cur = Cur->getParent(); 3113 if (!Cur->Encloses(DC)) { 3114 // The qualifying scope doesn't enclose the original declaration. 3115 // Emit diagnostic based on current scope. 3116 SourceLocation L = D.getIdentifierLoc(); 3117 SourceRange R = D.getCXXScopeSpec().getRange(); 3118 if (isa<FunctionDecl>(Cur)) 3119 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 3120 else 3121 Diag(L, diag::err_invalid_declarator_scope) 3122 << Name << cast<NamedDecl>(DC) << R; 3123 D.setInvalidType(); 3124 } 3125 } 3126 } 3127 3128 if (Previous.isSingleResult() && 3129 Previous.getFoundDecl()->isTemplateParameter()) { 3130 // Maybe we will complain about the shadowed template parameter. 3131 if (!D.isInvalidType()) 3132 if (DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), 3133 Previous.getFoundDecl())) 3134 D.setInvalidType(); 3135 3136 // Just pretend that we didn't see the previous declaration. 3137 Previous.clear(); 3138 } 3139 3140 // In C++, the previous declaration we find might be a tag type 3141 // (class or enum). In this case, the new declaration will hide the 3142 // tag type. Note that this does does not apply if we're declaring a 3143 // typedef (C++ [dcl.typedef]p4). 3144 if (Previous.isSingleTagDecl() && 3145 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 3146 Previous.clear(); 3147 3148 bool Redeclaration = false; 3149 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 3150 if (TemplateParamLists.size()) { 3151 Diag(D.getIdentifierLoc(), diag::err_template_typedef); 3152 return 0; 3153 } 3154 3155 New = ActOnTypedefDeclarator(S, D, DC, R, TInfo, Previous, Redeclaration); 3156 } else if (R->isFunctionType()) { 3157 New = ActOnFunctionDeclarator(S, D, DC, R, TInfo, Previous, 3158 move(TemplateParamLists), 3159 IsFunctionDefinition, Redeclaration); 3160 } else { 3161 New = ActOnVariableDeclarator(S, D, DC, R, TInfo, Previous, 3162 move(TemplateParamLists), 3163 Redeclaration); 3164 } 3165 3166 if (New == 0) 3167 return 0; 3168 3169 // If this has an identifier and is not an invalid redeclaration or 3170 // function template specialization, add it to the scope stack. 3171 if (New->getDeclName() && !(Redeclaration && New->isInvalidDecl())) 3172 PushOnScopeChains(New, S); 3173 3174 return New; 3175} 3176 3177/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 3178/// types into constant array types in certain situations which would otherwise 3179/// be errors (for GCC compatibility). 3180static QualType TryToFixInvalidVariablyModifiedType(QualType T, 3181 ASTContext &Context, 3182 bool &SizeIsNegative, 3183 llvm::APSInt &Oversized) { 3184 // This method tries to turn a variable array into a constant 3185 // array even when the size isn't an ICE. This is necessary 3186 // for compatibility with code that depends on gcc's buggy 3187 // constant expression folding, like struct {char x[(int)(char*)2];} 3188 SizeIsNegative = false; 3189 Oversized = 0; 3190 3191 if (T->isDependentType()) 3192 return QualType(); 3193 3194 QualifierCollector Qs; 3195 const Type *Ty = Qs.strip(T); 3196 3197 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) { 3198 QualType Pointee = PTy->getPointeeType(); 3199 QualType FixedType = 3200 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative, 3201 Oversized); 3202 if (FixedType.isNull()) return FixedType; 3203 FixedType = Context.getPointerType(FixedType); 3204 return Qs.apply(Context, FixedType); 3205 } 3206 if (const ParenType* PTy = dyn_cast<ParenType>(Ty)) { 3207 QualType Inner = PTy->getInnerType(); 3208 QualType FixedType = 3209 TryToFixInvalidVariablyModifiedType(Inner, Context, SizeIsNegative, 3210 Oversized); 3211 if (FixedType.isNull()) return FixedType; 3212 FixedType = Context.getParenType(FixedType); 3213 return Qs.apply(Context, FixedType); 3214 } 3215 3216 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 3217 if (!VLATy) 3218 return QualType(); 3219 // FIXME: We should probably handle this case 3220 if (VLATy->getElementType()->isVariablyModifiedType()) 3221 return QualType(); 3222 3223 Expr::EvalResult EvalResult; 3224 if (!VLATy->getSizeExpr() || 3225 !VLATy->getSizeExpr()->Evaluate(EvalResult, Context) || 3226 !EvalResult.Val.isInt()) 3227 return QualType(); 3228 3229 // Check whether the array size is negative. 3230 llvm::APSInt &Res = EvalResult.Val.getInt(); 3231 if (Res.isSigned() && Res.isNegative()) { 3232 SizeIsNegative = true; 3233 return QualType(); 3234 } 3235 3236 // Check whether the array is too large to be addressed. 3237 unsigned ActiveSizeBits 3238 = ConstantArrayType::getNumAddressingBits(Context, VLATy->getElementType(), 3239 Res); 3240 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) { 3241 Oversized = Res; 3242 return QualType(); 3243 } 3244 3245 return Context.getConstantArrayType(VLATy->getElementType(), 3246 Res, ArrayType::Normal, 0); 3247} 3248 3249/// \brief Register the given locally-scoped external C declaration so 3250/// that it can be found later for redeclarations 3251void 3252Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, 3253 const LookupResult &Previous, 3254 Scope *S) { 3255 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 3256 "Decl is not a locally-scoped decl!"); 3257 // Note that we have a locally-scoped external with this name. 3258 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 3259 3260 if (!Previous.isSingleResult()) 3261 return; 3262 3263 NamedDecl *PrevDecl = Previous.getFoundDecl(); 3264 3265 // If there was a previous declaration of this variable, it may be 3266 // in our identifier chain. Update the identifier chain with the new 3267 // declaration. 3268 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 3269 // The previous declaration was found on the identifer resolver 3270 // chain, so remove it from its scope. 3271 while (S && !S->isDeclScope(PrevDecl)) 3272 S = S->getParent(); 3273 3274 if (S) 3275 S->RemoveDecl(PrevDecl); 3276 } 3277} 3278 3279/// \brief Diagnose function specifiers on a declaration of an identifier that 3280/// does not identify a function. 3281void Sema::DiagnoseFunctionSpecifiers(Declarator& D) { 3282 // FIXME: We should probably indicate the identifier in question to avoid 3283 // confusion for constructs like "inline int a(), b;" 3284 if (D.getDeclSpec().isInlineSpecified()) 3285 Diag(D.getDeclSpec().getInlineSpecLoc(), 3286 diag::err_inline_non_function); 3287 3288 if (D.getDeclSpec().isVirtualSpecified()) 3289 Diag(D.getDeclSpec().getVirtualSpecLoc(), 3290 diag::err_virtual_non_function); 3291 3292 if (D.getDeclSpec().isExplicitSpecified()) 3293 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3294 diag::err_explicit_non_function); 3295} 3296 3297NamedDecl* 3298Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 3299 QualType R, TypeSourceInfo *TInfo, 3300 LookupResult &Previous, bool &Redeclaration) { 3301 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 3302 if (D.getCXXScopeSpec().isSet()) { 3303 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 3304 << D.getCXXScopeSpec().getRange(); 3305 D.setInvalidType(); 3306 // Pretend we didn't see the scope specifier. 3307 DC = CurContext; 3308 Previous.clear(); 3309 } 3310 3311 if (getLangOptions().CPlusPlus) { 3312 // Check that there are no default arguments (C++ only). 3313 CheckExtraCXXDefaultArguments(D); 3314 } 3315 3316 DiagnoseFunctionSpecifiers(D); 3317 3318 if (D.getDeclSpec().isThreadSpecified()) 3319 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 3320 3321 if (D.getName().Kind != UnqualifiedId::IK_Identifier) { 3322 Diag(D.getName().StartLocation, diag::err_typedef_not_identifier) 3323 << D.getName().getSourceRange(); 3324 return 0; 3325 } 3326 3327 TypedefDecl *NewTD = ParseTypedefDecl(S, D, R, TInfo); 3328 if (!NewTD) return 0; 3329 3330 // Handle attributes prior to checking for duplicates in MergeVarDecl 3331 ProcessDeclAttributes(S, NewTD, D); 3332 3333 CheckTypedefForVariablyModifiedType(S, NewTD); 3334 3335 return ActOnTypedefNameDecl(S, DC, NewTD, Previous, Redeclaration); 3336} 3337 3338void 3339Sema::CheckTypedefForVariablyModifiedType(Scope *S, TypedefNameDecl *NewTD) { 3340 // C99 6.7.7p2: If a typedef name specifies a variably modified type 3341 // then it shall have block scope. 3342 // Note that variably modified types must be fixed before merging the decl so 3343 // that redeclarations will match. 3344 QualType T = NewTD->getUnderlyingType(); 3345 if (T->isVariablyModifiedType()) { 3346 getCurFunction()->setHasBranchProtectedScope(); 3347 3348 if (S->getFnParent() == 0) { 3349 bool SizeIsNegative; 3350 llvm::APSInt Oversized; 3351 QualType FixedTy = 3352 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 3353 Oversized); 3354 if (!FixedTy.isNull()) { 3355 Diag(NewTD->getLocation(), diag::warn_illegal_constant_array_size); 3356 NewTD->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(FixedTy)); 3357 } else { 3358 if (SizeIsNegative) 3359 Diag(NewTD->getLocation(), diag::err_typecheck_negative_array_size); 3360 else if (T->isVariableArrayType()) 3361 Diag(NewTD->getLocation(), diag::err_vla_decl_in_file_scope); 3362 else if (Oversized.getBoolValue()) 3363 Diag(NewTD->getLocation(), diag::err_array_too_large) << Oversized.toString(10); 3364 else 3365 Diag(NewTD->getLocation(), diag::err_vm_decl_in_file_scope); 3366 NewTD->setInvalidDecl(); 3367 } 3368 } 3369 } 3370} 3371 3372 3373/// ActOnTypedefNameDecl - Perform semantic checking for a declaration which 3374/// declares a typedef-name, either using the 'typedef' type specifier or via 3375/// a C++0x [dcl.typedef]p2 alias-declaration: 'using T = A;'. 3376NamedDecl* 3377Sema::ActOnTypedefNameDecl(Scope *S, DeclContext *DC, TypedefNameDecl *NewTD, 3378 LookupResult &Previous, bool &Redeclaration) { 3379 // Merge the decl with the existing one if appropriate. If the decl is 3380 // in an outer scope, it isn't the same thing. 3381 FilterLookupForScope(Previous, DC, S, /*ConsiderLinkage*/ false, 3382 /*ExplicitInstantiationOrSpecialization=*/false); 3383 if (!Previous.empty()) { 3384 Redeclaration = true; 3385 MergeTypedefNameDecl(NewTD, Previous); 3386 } 3387 3388 // If this is the C FILE type, notify the AST context. 3389 if (IdentifierInfo *II = NewTD->getIdentifier()) 3390 if (!NewTD->isInvalidDecl() && 3391 NewTD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 3392 if (II->isStr("FILE")) 3393 Context.setFILEDecl(NewTD); 3394 else if (II->isStr("jmp_buf")) 3395 Context.setjmp_bufDecl(NewTD); 3396 else if (II->isStr("sigjmp_buf")) 3397 Context.setsigjmp_bufDecl(NewTD); 3398 else if (II->isStr("__builtin_va_list")) 3399 Context.setBuiltinVaListType(Context.getTypedefType(NewTD)); 3400 } 3401 3402 return NewTD; 3403} 3404 3405/// \brief Determines whether the given declaration is an out-of-scope 3406/// previous declaration. 3407/// 3408/// This routine should be invoked when name lookup has found a 3409/// previous declaration (PrevDecl) that is not in the scope where a 3410/// new declaration by the same name is being introduced. If the new 3411/// declaration occurs in a local scope, previous declarations with 3412/// linkage may still be considered previous declarations (C99 3413/// 6.2.2p4-5, C++ [basic.link]p6). 3414/// 3415/// \param PrevDecl the previous declaration found by name 3416/// lookup 3417/// 3418/// \param DC the context in which the new declaration is being 3419/// declared. 3420/// 3421/// \returns true if PrevDecl is an out-of-scope previous declaration 3422/// for a new delcaration with the same name. 3423static bool 3424isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 3425 ASTContext &Context) { 3426 if (!PrevDecl) 3427 return false; 3428 3429 if (!PrevDecl->hasLinkage()) 3430 return false; 3431 3432 if (Context.getLangOptions().CPlusPlus) { 3433 // C++ [basic.link]p6: 3434 // If there is a visible declaration of an entity with linkage 3435 // having the same name and type, ignoring entities declared 3436 // outside the innermost enclosing namespace scope, the block 3437 // scope declaration declares that same entity and receives the 3438 // linkage of the previous declaration. 3439 DeclContext *OuterContext = DC->getRedeclContext(); 3440 if (!OuterContext->isFunctionOrMethod()) 3441 // This rule only applies to block-scope declarations. 3442 return false; 3443 3444 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 3445 if (PrevOuterContext->isRecord()) 3446 // We found a member function: ignore it. 3447 return false; 3448 3449 // Find the innermost enclosing namespace for the new and 3450 // previous declarations. 3451 OuterContext = OuterContext->getEnclosingNamespaceContext(); 3452 PrevOuterContext = PrevOuterContext->getEnclosingNamespaceContext(); 3453 3454 // The previous declaration is in a different namespace, so it 3455 // isn't the same function. 3456 if (!OuterContext->Equals(PrevOuterContext)) 3457 return false; 3458 } 3459 3460 return true; 3461} 3462 3463static void SetNestedNameSpecifier(DeclaratorDecl *DD, Declarator &D) { 3464 CXXScopeSpec &SS = D.getCXXScopeSpec(); 3465 if (!SS.isSet()) return; 3466 DD->setQualifierInfo(SS.getWithLocInContext(DD->getASTContext())); 3467} 3468 3469NamedDecl* 3470Sema::ActOnVariableDeclarator(Scope *S, Declarator &D, DeclContext *DC, 3471 QualType R, TypeSourceInfo *TInfo, 3472 LookupResult &Previous, 3473 MultiTemplateParamsArg TemplateParamLists, 3474 bool &Redeclaration) { 3475 DeclarationName Name = GetNameForDeclarator(D).getName(); 3476 3477 // Check that there are no default arguments (C++ only). 3478 if (getLangOptions().CPlusPlus) 3479 CheckExtraCXXDefaultArguments(D); 3480 3481 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpec(); 3482 assert(SCSpec != DeclSpec::SCS_typedef && 3483 "Parser allowed 'typedef' as storage class VarDecl."); 3484 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 3485 if (SCSpec == DeclSpec::SCS_mutable) { 3486 // mutable can only appear on non-static class members, so it's always 3487 // an error here 3488 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 3489 D.setInvalidType(); 3490 SC = SC_None; 3491 } 3492 SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 3493 VarDecl::StorageClass SCAsWritten 3494 = StorageClassSpecToVarDeclStorageClass(SCSpec); 3495 3496 IdentifierInfo *II = Name.getAsIdentifierInfo(); 3497 if (!II) { 3498 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 3499 << Name.getAsString(); 3500 return 0; 3501 } 3502 3503 DiagnoseFunctionSpecifiers(D); 3504 3505 if (!DC->isRecord() && S->getFnParent() == 0) { 3506 // C99 6.9p2: The storage-class specifiers auto and register shall not 3507 // appear in the declaration specifiers in an external declaration. 3508 if (SC == SC_Auto || SC == SC_Register) { 3509 3510 // If this is a register variable with an asm label specified, then this 3511 // is a GNU extension. 3512 if (SC == SC_Register && D.getAsmLabel()) 3513 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register); 3514 else 3515 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 3516 D.setInvalidType(); 3517 } 3518 } 3519 3520 bool isExplicitSpecialization = false; 3521 VarDecl *NewVD; 3522 if (!getLangOptions().CPlusPlus) { 3523 NewVD = VarDecl::Create(Context, DC, D.getSourceRange().getBegin(), 3524 D.getIdentifierLoc(), II, 3525 R, TInfo, SC, SCAsWritten); 3526 3527 if (D.isInvalidType()) 3528 NewVD->setInvalidDecl(); 3529 } else { 3530 if (DC->isRecord() && !CurContext->isRecord()) { 3531 // This is an out-of-line definition of a static data member. 3532 if (SC == SC_Static) { 3533 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 3534 diag::err_static_out_of_line) 3535 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3536 } else if (SC == SC_None) 3537 SC = SC_Static; 3538 } 3539 if (SC == SC_Static) { 3540 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) { 3541 if (RD->isLocalClass()) 3542 Diag(D.getIdentifierLoc(), 3543 diag::err_static_data_member_not_allowed_in_local_class) 3544 << Name << RD->getDeclName(); 3545 3546 // C++ [class.union]p1: If a union contains a static data member, 3547 // the program is ill-formed. 3548 // 3549 // We also disallow static data members in anonymous structs. 3550 if (CurContext->isRecord() && (RD->isUnion() || !RD->getDeclName())) 3551 Diag(D.getIdentifierLoc(), 3552 diag::err_static_data_member_not_allowed_in_union_or_anon_struct) 3553 << Name << RD->isUnion(); 3554 } 3555 } 3556 3557 // Match up the template parameter lists with the scope specifier, then 3558 // determine whether we have a template or a template specialization. 3559 isExplicitSpecialization = false; 3560 bool Invalid = false; 3561 if (TemplateParameterList *TemplateParams 3562 = MatchTemplateParametersToScopeSpecifier( 3563 D.getDeclSpec().getSourceRange().getBegin(), 3564 D.getIdentifierLoc(), 3565 D.getCXXScopeSpec(), 3566 TemplateParamLists.get(), 3567 TemplateParamLists.size(), 3568 /*never a friend*/ false, 3569 isExplicitSpecialization, 3570 Invalid)) { 3571 if (TemplateParams->size() > 0) { 3572 // There is no such thing as a variable template. 3573 Diag(D.getIdentifierLoc(), diag::err_template_variable) 3574 << II 3575 << SourceRange(TemplateParams->getTemplateLoc(), 3576 TemplateParams->getRAngleLoc()); 3577 return 0; 3578 } else { 3579 // There is an extraneous 'template<>' for this variable. Complain 3580 // about it, but allow the declaration of the variable. 3581 Diag(TemplateParams->getTemplateLoc(), 3582 diag::err_template_variable_noparams) 3583 << II 3584 << SourceRange(TemplateParams->getTemplateLoc(), 3585 TemplateParams->getRAngleLoc()); 3586 } 3587 } 3588 3589 NewVD = VarDecl::Create(Context, DC, D.getSourceRange().getBegin(), 3590 D.getIdentifierLoc(), II, 3591 R, TInfo, SC, SCAsWritten); 3592 3593 // If this decl has an auto type in need of deduction, make a note of the 3594 // Decl so we can diagnose uses of it in its own initializer. 3595 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto && 3596 R->getContainedAutoType()) 3597 ParsingInitForAutoVars.insert(NewVD); 3598 3599 if (D.isInvalidType() || Invalid) 3600 NewVD->setInvalidDecl(); 3601 3602 SetNestedNameSpecifier(NewVD, D); 3603 3604 if (TemplateParamLists.size() > 0 && D.getCXXScopeSpec().isSet()) { 3605 NewVD->setTemplateParameterListsInfo(Context, 3606 TemplateParamLists.size(), 3607 TemplateParamLists.release()); 3608 } 3609 } 3610 3611 if (D.getDeclSpec().isThreadSpecified()) { 3612 if (NewVD->hasLocalStorage()) 3613 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global); 3614 else if (!Context.Target.isTLSSupported()) 3615 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported); 3616 else 3617 NewVD->setThreadSpecified(true); 3618 } 3619 3620 // Set the lexical context. If the declarator has a C++ scope specifier, the 3621 // lexical context will be different from the semantic context. 3622 NewVD->setLexicalDeclContext(CurContext); 3623 3624 // Handle attributes prior to checking for duplicates in MergeVarDecl 3625 ProcessDeclAttributes(S, NewVD, D); 3626 3627 // Handle GNU asm-label extension (encoded as an attribute). 3628 if (Expr *E = (Expr*)D.getAsmLabel()) { 3629 // The parser guarantees this is a string. 3630 StringLiteral *SE = cast<StringLiteral>(E); 3631 llvm::StringRef Label = SE->getString(); 3632 if (S->getFnParent() != 0) { 3633 switch (SC) { 3634 case SC_None: 3635 case SC_Auto: 3636 Diag(E->getExprLoc(), diag::warn_asm_label_on_auto_decl) << Label; 3637 break; 3638 case SC_Register: 3639 if (!Context.Target.isValidGCCRegisterName(Label)) 3640 Diag(E->getExprLoc(), diag::err_asm_unknown_register_name) << Label; 3641 break; 3642 case SC_Static: 3643 case SC_Extern: 3644 case SC_PrivateExtern: 3645 break; 3646 } 3647 } 3648 3649 NewVD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), 3650 Context, Label)); 3651 } 3652 3653 // Diagnose shadowed variables before filtering for scope. 3654 if (!D.getCXXScopeSpec().isSet()) 3655 CheckShadow(S, NewVD, Previous); 3656 3657 // Don't consider existing declarations that are in a different 3658 // scope and are out-of-semantic-context declarations (if the new 3659 // declaration has linkage). 3660 FilterLookupForScope(Previous, DC, S, NewVD->hasLinkage(), 3661 isExplicitSpecialization); 3662 3663 if (!getLangOptions().CPlusPlus) 3664 CheckVariableDeclaration(NewVD, Previous, Redeclaration); 3665 else { 3666 // Merge the decl with the existing one if appropriate. 3667 if (!Previous.empty()) { 3668 if (Previous.isSingleResult() && 3669 isa<FieldDecl>(Previous.getFoundDecl()) && 3670 D.getCXXScopeSpec().isSet()) { 3671 // The user tried to define a non-static data member 3672 // out-of-line (C++ [dcl.meaning]p1). 3673 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 3674 << D.getCXXScopeSpec().getRange(); 3675 Previous.clear(); 3676 NewVD->setInvalidDecl(); 3677 } 3678 } else if (D.getCXXScopeSpec().isSet()) { 3679 // No previous declaration in the qualifying scope. 3680 Diag(D.getIdentifierLoc(), diag::err_no_member) 3681 << Name << computeDeclContext(D.getCXXScopeSpec(), true) 3682 << D.getCXXScopeSpec().getRange(); 3683 NewVD->setInvalidDecl(); 3684 } 3685 3686 CheckVariableDeclaration(NewVD, Previous, Redeclaration); 3687 3688 // This is an explicit specialization of a static data member. Check it. 3689 if (isExplicitSpecialization && !NewVD->isInvalidDecl() && 3690 CheckMemberSpecialization(NewVD, Previous)) 3691 NewVD->setInvalidDecl(); 3692 } 3693 3694 // attributes declared post-definition are currently ignored 3695 // FIXME: This should be handled in attribute merging, not 3696 // here. 3697 if (Previous.isSingleResult()) { 3698 VarDecl *Def = dyn_cast<VarDecl>(Previous.getFoundDecl()); 3699 if (Def && (Def = Def->getDefinition()) && 3700 Def != NewVD && D.hasAttributes()) { 3701 Diag(NewVD->getLocation(), diag::warn_attribute_precede_definition); 3702 Diag(Def->getLocation(), diag::note_previous_definition); 3703 } 3704 } 3705 3706 // If this is a locally-scoped extern C variable, update the map of 3707 // such variables. 3708 if (CurContext->isFunctionOrMethod() && NewVD->isExternC() && 3709 !NewVD->isInvalidDecl()) 3710 RegisterLocallyScopedExternCDecl(NewVD, Previous, S); 3711 3712 // If there's a #pragma GCC visibility in scope, and this isn't a class 3713 // member, set the visibility of this variable. 3714 if (NewVD->getLinkage() == ExternalLinkage && !DC->isRecord()) 3715 AddPushedVisibilityAttribute(NewVD); 3716 3717 MarkUnusedFileScopedDecl(NewVD); 3718 3719 return NewVD; 3720} 3721 3722/// \brief Diagnose variable or built-in function shadowing. Implements 3723/// -Wshadow. 3724/// 3725/// This method is called whenever a VarDecl is added to a "useful" 3726/// scope. 3727/// 3728/// \param S the scope in which the shadowing name is being declared 3729/// \param R the lookup of the name 3730/// 3731void Sema::CheckShadow(Scope *S, VarDecl *D, const LookupResult& R) { 3732 // Return if warning is ignored. 3733 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, R.getNameLoc()) == 3734 Diagnostic::Ignored) 3735 return; 3736 3737 // Don't diagnose declarations at file scope. 3738 if (D->hasGlobalStorage()) 3739 return; 3740 3741 DeclContext *NewDC = D->getDeclContext(); 3742 3743 // Only diagnose if we're shadowing an unambiguous field or variable. 3744 if (R.getResultKind() != LookupResult::Found) 3745 return; 3746 3747 NamedDecl* ShadowedDecl = R.getFoundDecl(); 3748 if (!isa<VarDecl>(ShadowedDecl) && !isa<FieldDecl>(ShadowedDecl)) 3749 return; 3750 3751 // Fields are not shadowed by variables in C++ static methods. 3752 if (isa<FieldDecl>(ShadowedDecl)) 3753 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewDC)) 3754 if (MD->isStatic()) 3755 return; 3756 3757 if (VarDecl *shadowedVar = dyn_cast<VarDecl>(ShadowedDecl)) 3758 if (shadowedVar->isExternC()) { 3759 // For shadowing external vars, make sure that we point to the global 3760 // declaration, not a locally scoped extern declaration. 3761 for (VarDecl::redecl_iterator 3762 I = shadowedVar->redecls_begin(), E = shadowedVar->redecls_end(); 3763 I != E; ++I) 3764 if (I->isFileVarDecl()) { 3765 ShadowedDecl = *I; 3766 break; 3767 } 3768 } 3769 3770 DeclContext *OldDC = ShadowedDecl->getDeclContext(); 3771 3772 // Only warn about certain kinds of shadowing for class members. 3773 if (NewDC && NewDC->isRecord()) { 3774 // In particular, don't warn about shadowing non-class members. 3775 if (!OldDC->isRecord()) 3776 return; 3777 3778 // TODO: should we warn about static data members shadowing 3779 // static data members from base classes? 3780 3781 // TODO: don't diagnose for inaccessible shadowed members. 3782 // This is hard to do perfectly because we might friend the 3783 // shadowing context, but that's just a false negative. 3784 } 3785 3786 // Determine what kind of declaration we're shadowing. 3787 unsigned Kind; 3788 if (isa<RecordDecl>(OldDC)) { 3789 if (isa<FieldDecl>(ShadowedDecl)) 3790 Kind = 3; // field 3791 else 3792 Kind = 2; // static data member 3793 } else if (OldDC->isFileContext()) 3794 Kind = 1; // global 3795 else 3796 Kind = 0; // local 3797 3798 DeclarationName Name = R.getLookupName(); 3799 3800 // Emit warning and note. 3801 Diag(R.getNameLoc(), diag::warn_decl_shadow) << Name << Kind << OldDC; 3802 Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration); 3803} 3804 3805/// \brief Check -Wshadow without the advantage of a previous lookup. 3806void Sema::CheckShadow(Scope *S, VarDecl *D) { 3807 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, D->getLocation()) == 3808 Diagnostic::Ignored) 3809 return; 3810 3811 LookupResult R(*this, D->getDeclName(), D->getLocation(), 3812 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 3813 LookupName(R, S); 3814 CheckShadow(S, D, R); 3815} 3816 3817/// \brief Perform semantic checking on a newly-created variable 3818/// declaration. 3819/// 3820/// This routine performs all of the type-checking required for a 3821/// variable declaration once it has been built. It is used both to 3822/// check variables after they have been parsed and their declarators 3823/// have been translated into a declaration, and to check variables 3824/// that have been instantiated from a template. 3825/// 3826/// Sets NewVD->isInvalidDecl() if an error was encountered. 3827void Sema::CheckVariableDeclaration(VarDecl *NewVD, 3828 LookupResult &Previous, 3829 bool &Redeclaration) { 3830 // If the decl is already known invalid, don't check it. 3831 if (NewVD->isInvalidDecl()) 3832 return; 3833 3834 QualType T = NewVD->getType(); 3835 3836 if (T->isObjCObjectType()) { 3837 Diag(NewVD->getLocation(), diag::err_statically_allocated_object); 3838 return NewVD->setInvalidDecl(); 3839 } 3840 3841 // Emit an error if an address space was applied to decl with local storage. 3842 // This includes arrays of objects with address space qualifiers, but not 3843 // automatic variables that point to other address spaces. 3844 // ISO/IEC TR 18037 S5.1.2 3845 if (NewVD->hasLocalStorage() && T.getAddressSpace() != 0) { 3846 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 3847 return NewVD->setInvalidDecl(); 3848 } 3849 3850 if (NewVD->hasLocalStorage() && T.isObjCGCWeak() 3851 && !NewVD->hasAttr<BlocksAttr>()) 3852 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 3853 3854 bool isVM = T->isVariablyModifiedType(); 3855 if (isVM || NewVD->hasAttr<CleanupAttr>() || 3856 NewVD->hasAttr<BlocksAttr>()) 3857 getCurFunction()->setHasBranchProtectedScope(); 3858 3859 if ((isVM && NewVD->hasLinkage()) || 3860 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { 3861 bool SizeIsNegative; 3862 llvm::APSInt Oversized; 3863 QualType FixedTy = 3864 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 3865 Oversized); 3866 3867 if (FixedTy.isNull() && T->isVariableArrayType()) { 3868 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 3869 // FIXME: This won't give the correct result for 3870 // int a[10][n]; 3871 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 3872 3873 if (NewVD->isFileVarDecl()) 3874 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 3875 << SizeRange; 3876 else if (NewVD->getStorageClass() == SC_Static) 3877 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 3878 << SizeRange; 3879 else 3880 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 3881 << SizeRange; 3882 return NewVD->setInvalidDecl(); 3883 } 3884 3885 if (FixedTy.isNull()) { 3886 if (NewVD->isFileVarDecl()) 3887 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 3888 else 3889 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 3890 return NewVD->setInvalidDecl(); 3891 } 3892 3893 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 3894 NewVD->setType(FixedTy); 3895 } 3896 3897 if (Previous.empty() && NewVD->isExternC()) { 3898 // Since we did not find anything by this name and we're declaring 3899 // an extern "C" variable, look for a non-visible extern "C" 3900 // declaration with the same name. 3901 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3902 = LocallyScopedExternalDecls.find(NewVD->getDeclName()); 3903 if (Pos != LocallyScopedExternalDecls.end()) 3904 Previous.addDecl(Pos->second); 3905 } 3906 3907 if (T->isVoidType() && !NewVD->hasExternalStorage()) { 3908 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 3909 << T; 3910 return NewVD->setInvalidDecl(); 3911 } 3912 3913 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { 3914 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); 3915 return NewVD->setInvalidDecl(); 3916 } 3917 3918 if (isVM && NewVD->hasAttr<BlocksAttr>()) { 3919 Diag(NewVD->getLocation(), diag::err_block_on_vm); 3920 return NewVD->setInvalidDecl(); 3921 } 3922 3923 // Function pointers and references cannot have qualified function type, only 3924 // function pointer-to-members can do that. 3925 QualType Pointee; 3926 unsigned PtrOrRef = 0; 3927 if (const PointerType *Ptr = T->getAs<PointerType>()) 3928 Pointee = Ptr->getPointeeType(); 3929 else if (const ReferenceType *Ref = T->getAs<ReferenceType>()) { 3930 Pointee = Ref->getPointeeType(); 3931 PtrOrRef = 1; 3932 } 3933 if (!Pointee.isNull() && Pointee->isFunctionProtoType() && 3934 Pointee->getAs<FunctionProtoType>()->getTypeQuals() != 0) { 3935 Diag(NewVD->getLocation(), diag::err_invalid_qualified_function_pointer) 3936 << PtrOrRef; 3937 return NewVD->setInvalidDecl(); 3938 } 3939 3940 if (!Previous.empty()) { 3941 Redeclaration = true; 3942 MergeVarDecl(NewVD, Previous); 3943 } 3944} 3945 3946/// \brief Data used with FindOverriddenMethod 3947struct FindOverriddenMethodData { 3948 Sema *S; 3949 CXXMethodDecl *Method; 3950}; 3951 3952/// \brief Member lookup function that determines whether a given C++ 3953/// method overrides a method in a base class, to be used with 3954/// CXXRecordDecl::lookupInBases(). 3955static bool FindOverriddenMethod(const CXXBaseSpecifier *Specifier, 3956 CXXBasePath &Path, 3957 void *UserData) { 3958 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 3959 3960 FindOverriddenMethodData *Data 3961 = reinterpret_cast<FindOverriddenMethodData*>(UserData); 3962 3963 DeclarationName Name = Data->Method->getDeclName(); 3964 3965 // FIXME: Do we care about other names here too? 3966 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 3967 // We really want to find the base class destructor here. 3968 QualType T = Data->S->Context.getTypeDeclType(BaseRecord); 3969 CanQualType CT = Data->S->Context.getCanonicalType(T); 3970 3971 Name = Data->S->Context.DeclarationNames.getCXXDestructorName(CT); 3972 } 3973 3974 for (Path.Decls = BaseRecord->lookup(Name); 3975 Path.Decls.first != Path.Decls.second; 3976 ++Path.Decls.first) { 3977 NamedDecl *D = *Path.Decls.first; 3978 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 3979 if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD, false)) 3980 return true; 3981 } 3982 } 3983 3984 return false; 3985} 3986 3987/// AddOverriddenMethods - See if a method overrides any in the base classes, 3988/// and if so, check that it's a valid override and remember it. 3989bool Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 3990 // Look for virtual methods in base classes that this method might override. 3991 CXXBasePaths Paths; 3992 FindOverriddenMethodData Data; 3993 Data.Method = MD; 3994 Data.S = this; 3995 bool AddedAny = false; 3996 if (DC->lookupInBases(&FindOverriddenMethod, &Data, Paths)) { 3997 for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(), 3998 E = Paths.found_decls_end(); I != E; ++I) { 3999 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) { 4000 if (!CheckOverridingFunctionReturnType(MD, OldMD) && 4001 !CheckOverridingFunctionExceptionSpec(MD, OldMD) && 4002 !CheckIfOverriddenFunctionIsMarkedFinal(MD, OldMD)) { 4003 MD->addOverriddenMethod(OldMD->getCanonicalDecl()); 4004 AddedAny = true; 4005 } 4006 } 4007 } 4008 } 4009 4010 return AddedAny; 4011} 4012 4013static void DiagnoseInvalidRedeclaration(Sema &S, FunctionDecl *NewFD) { 4014 LookupResult Prev(S, NewFD->getDeclName(), NewFD->getLocation(), 4015 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4016 S.LookupQualifiedName(Prev, NewFD->getDeclContext()); 4017 assert(!Prev.isAmbiguous() && 4018 "Cannot have an ambiguity in previous-declaration lookup"); 4019 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 4020 Func != FuncEnd; ++Func) { 4021 if (isa<FunctionDecl>(*Func) && 4022 isNearlyMatchingFunction(S.Context, cast<FunctionDecl>(*Func), NewFD)) 4023 S.Diag((*Func)->getLocation(), diag::note_member_def_close_match); 4024 } 4025} 4026 4027NamedDecl* 4028Sema::ActOnFunctionDeclarator(Scope* S, Declarator& D, DeclContext* DC, 4029 QualType R, TypeSourceInfo *TInfo, 4030 LookupResult &Previous, 4031 MultiTemplateParamsArg TemplateParamLists, 4032 bool IsFunctionDefinition, bool &Redeclaration) { 4033 assert(R.getTypePtr()->isFunctionType()); 4034 4035 // TODO: consider using NameInfo for diagnostic. 4036 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 4037 DeclarationName Name = NameInfo.getName(); 4038 FunctionDecl::StorageClass SC = SC_None; 4039 switch (D.getDeclSpec().getStorageClassSpec()) { 4040 default: assert(0 && "Unknown storage class!"); 4041 case DeclSpec::SCS_auto: 4042 case DeclSpec::SCS_register: 4043 case DeclSpec::SCS_mutable: 4044 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4045 diag::err_typecheck_sclass_func); 4046 D.setInvalidType(); 4047 break; 4048 case DeclSpec::SCS_unspecified: SC = SC_None; break; 4049 case DeclSpec::SCS_extern: SC = SC_Extern; break; 4050 case DeclSpec::SCS_static: { 4051 if (CurContext->getRedeclContext()->isFunctionOrMethod()) { 4052 // C99 6.7.1p5: 4053 // The declaration of an identifier for a function that has 4054 // block scope shall have no explicit storage-class specifier 4055 // other than extern 4056 // See also (C++ [dcl.stc]p4). 4057 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4058 diag::err_static_block_func); 4059 SC = SC_None; 4060 } else 4061 SC = SC_Static; 4062 break; 4063 } 4064 case DeclSpec::SCS_private_extern: SC = SC_PrivateExtern; break; 4065 } 4066 4067 if (D.getDeclSpec().isThreadSpecified()) 4068 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 4069 4070 // Do not allow returning a objc interface by-value. 4071 if (R->getAs<FunctionType>()->getResultType()->isObjCObjectType()) { 4072 Diag(D.getIdentifierLoc(), 4073 diag::err_object_cannot_be_passed_returned_by_value) << 0 4074 << R->getAs<FunctionType>()->getResultType(); 4075 D.setInvalidType(); 4076 } 4077 4078 FunctionDecl *NewFD; 4079 bool isInline = D.getDeclSpec().isInlineSpecified(); 4080 bool isFriend = false; 4081 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 4082 FunctionDecl::StorageClass SCAsWritten 4083 = StorageClassSpecToFunctionDeclStorageClass(SCSpec); 4084 FunctionTemplateDecl *FunctionTemplate = 0; 4085 bool isExplicitSpecialization = false; 4086 bool isFunctionTemplateSpecialization = false; 4087 4088 if (!getLangOptions().CPlusPlus) { 4089 // Determine whether the function was written with a 4090 // prototype. This true when: 4091 // - there is a prototype in the declarator, or 4092 // - the type R of the function is some kind of typedef or other reference 4093 // to a type name (which eventually refers to a function type). 4094 bool HasPrototype = 4095 (D.isFunctionDeclarator() && D.getFunctionTypeInfo().hasPrototype) || 4096 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 4097 4098 NewFD = FunctionDecl::Create(Context, DC, D.getSourceRange().getBegin(), 4099 NameInfo, R, TInfo, SC, SCAsWritten, isInline, 4100 HasPrototype); 4101 if (D.isInvalidType()) 4102 NewFD->setInvalidDecl(); 4103 4104 // Set the lexical context. 4105 NewFD->setLexicalDeclContext(CurContext); 4106 // Filter out previous declarations that don't match the scope. 4107 FilterLookupForScope(Previous, DC, S, NewFD->hasLinkage(), 4108 /*ExplicitInstantiationOrSpecialization=*/false); 4109 } else { 4110 isFriend = D.getDeclSpec().isFriendSpecified(); 4111 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 4112 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 4113 bool isVirtualOkay = false; 4114 4115 // Check that the return type is not an abstract class type. 4116 // For record types, this is done by the AbstractClassUsageDiagnoser once 4117 // the class has been completely parsed. 4118 if (!DC->isRecord() && 4119 RequireNonAbstractType(D.getIdentifierLoc(), 4120 R->getAs<FunctionType>()->getResultType(), 4121 diag::err_abstract_type_in_decl, 4122 AbstractReturnType)) 4123 D.setInvalidType(); 4124 4125 if (Name.getNameKind() == DeclarationName::CXXConstructorName) { 4126 // This is a C++ constructor declaration. 4127 assert(DC->isRecord() && 4128 "Constructors can only be declared in a member context"); 4129 4130 R = CheckConstructorDeclarator(D, R, SC); 4131 4132 // Create the new declaration 4133 CXXConstructorDecl *NewCD = CXXConstructorDecl::Create( 4134 Context, 4135 cast<CXXRecordDecl>(DC), 4136 D.getSourceRange().getBegin(), 4137 NameInfo, R, TInfo, 4138 isExplicit, isInline, 4139 /*isImplicitlyDeclared=*/false); 4140 4141 NewFD = NewCD; 4142 } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4143 // This is a C++ destructor declaration. 4144 if (DC->isRecord()) { 4145 R = CheckDestructorDeclarator(D, R, SC); 4146 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 4147 4148 CXXDestructorDecl *NewDD = CXXDestructorDecl::Create(Context, Record, 4149 D.getSourceRange().getBegin(), 4150 NameInfo, R, TInfo, 4151 isInline, 4152 /*isImplicitlyDeclared=*/false); 4153 NewFD = NewDD; 4154 isVirtualOkay = true; 4155 4156 // If the class is complete, then we now create the implicit exception 4157 // specification. If the class is incomplete or dependent, we can't do 4158 // it yet. 4159 if (getLangOptions().CPlusPlus0x && !Record->isDependentType() && 4160 Record->getDefinition() && !Record->isBeingDefined() && 4161 R->getAs<FunctionProtoType>()->getExceptionSpecType() == EST_None) { 4162 AdjustDestructorExceptionSpec(Record, NewDD); 4163 } 4164 4165 } else { 4166 Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 4167 4168 // Create a FunctionDecl to satisfy the function definition parsing 4169 // code path. 4170 NewFD = FunctionDecl::Create(Context, DC, D.getSourceRange().getBegin(), 4171 D.getIdentifierLoc(), Name, R, TInfo, 4172 SC, SCAsWritten, isInline, 4173 /*hasPrototype=*/true); 4174 D.setInvalidType(); 4175 } 4176 } else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) { 4177 if (!DC->isRecord()) { 4178 Diag(D.getIdentifierLoc(), 4179 diag::err_conv_function_not_member); 4180 return 0; 4181 } 4182 4183 CheckConversionDeclarator(D, R, SC); 4184 NewFD = CXXConversionDecl::Create(Context, cast<CXXRecordDecl>(DC), 4185 D.getSourceRange().getBegin(), 4186 NameInfo, R, TInfo, 4187 isInline, isExplicit, 4188 SourceLocation()); 4189 4190 isVirtualOkay = true; 4191 } else if (DC->isRecord()) { 4192 // If the of the function is the same as the name of the record, then this 4193 // must be an invalid constructor that has a return type. 4194 // (The parser checks for a return type and makes the declarator a 4195 // constructor if it has no return type). 4196 // must have an invalid constructor that has a return type 4197 if (Name.getAsIdentifierInfo() && 4198 Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ 4199 Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 4200 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 4201 << SourceRange(D.getIdentifierLoc()); 4202 return 0; 4203 } 4204 4205 bool isStatic = SC == SC_Static; 4206 4207 // [class.free]p1: 4208 // Any allocation function for a class T is a static member 4209 // (even if not explicitly declared static). 4210 if (Name.getCXXOverloadedOperator() == OO_New || 4211 Name.getCXXOverloadedOperator() == OO_Array_New) 4212 isStatic = true; 4213 4214 // [class.free]p6 Any deallocation function for a class X is a static member 4215 // (even if not explicitly declared static). 4216 if (Name.getCXXOverloadedOperator() == OO_Delete || 4217 Name.getCXXOverloadedOperator() == OO_Array_Delete) 4218 isStatic = true; 4219 4220 // This is a C++ method declaration. 4221 CXXMethodDecl *NewMD = CXXMethodDecl::Create( 4222 Context, cast<CXXRecordDecl>(DC), 4223 D.getSourceRange().getBegin(), 4224 NameInfo, R, TInfo, 4225 isStatic, SCAsWritten, isInline, 4226 SourceLocation()); 4227 NewFD = NewMD; 4228 4229 isVirtualOkay = !isStatic; 4230 } else { 4231 // Determine whether the function was written with a 4232 // prototype. This true when: 4233 // - we're in C++ (where every function has a prototype), 4234 NewFD = FunctionDecl::Create(Context, DC, D.getSourceRange().getBegin(), 4235 NameInfo, R, TInfo, SC, SCAsWritten, isInline, 4236 true/*HasPrototype*/); 4237 } 4238 4239 if (isFriend && !isInline && IsFunctionDefinition) { 4240 // C++ [class.friend]p5 4241 // A function can be defined in a friend declaration of a 4242 // class . . . . Such a function is implicitly inline. 4243 NewFD->setImplicitlyInline(); 4244 } 4245 4246 SetNestedNameSpecifier(NewFD, D); 4247 isExplicitSpecialization = false; 4248 isFunctionTemplateSpecialization = false; 4249 if (D.isInvalidType()) 4250 NewFD->setInvalidDecl(); 4251 4252 // Set the lexical context. If the declarator has a C++ 4253 // scope specifier, or is the object of a friend declaration, the 4254 // lexical context will be different from the semantic context. 4255 NewFD->setLexicalDeclContext(CurContext); 4256 4257 // Match up the template parameter lists with the scope specifier, then 4258 // determine whether we have a template or a template specialization. 4259 bool Invalid = false; 4260 if (TemplateParameterList *TemplateParams 4261 = MatchTemplateParametersToScopeSpecifier( 4262 D.getDeclSpec().getSourceRange().getBegin(), 4263 D.getIdentifierLoc(), 4264 D.getCXXScopeSpec(), 4265 TemplateParamLists.get(), 4266 TemplateParamLists.size(), 4267 isFriend, 4268 isExplicitSpecialization, 4269 Invalid)) { 4270 if (TemplateParams->size() > 0) { 4271 // This is a function template 4272 4273 // Check that we can declare a template here. 4274 if (CheckTemplateDeclScope(S, TemplateParams)) 4275 return 0; 4276 4277 // A destructor cannot be a template. 4278 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4279 Diag(NewFD->getLocation(), diag::err_destructor_template); 4280 return 0; 4281 } 4282 4283 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC, 4284 NewFD->getLocation(), 4285 Name, TemplateParams, 4286 NewFD); 4287 FunctionTemplate->setLexicalDeclContext(CurContext); 4288 NewFD->setDescribedFunctionTemplate(FunctionTemplate); 4289 4290 // For source fidelity, store the other template param lists. 4291 if (TemplateParamLists.size() > 1) { 4292 NewFD->setTemplateParameterListsInfo(Context, 4293 TemplateParamLists.size() - 1, 4294 TemplateParamLists.release()); 4295 } 4296 } else { 4297 // This is a function template specialization. 4298 isFunctionTemplateSpecialization = true; 4299 // For source fidelity, store all the template param lists. 4300 NewFD->setTemplateParameterListsInfo(Context, 4301 TemplateParamLists.size(), 4302 TemplateParamLists.release()); 4303 4304 // C++0x [temp.expl.spec]p20 forbids "template<> friend void foo(int);". 4305 if (isFriend) { 4306 // We want to remove the "template<>", found here. 4307 SourceRange RemoveRange = TemplateParams->getSourceRange(); 4308 4309 // If we remove the template<> and the name is not a 4310 // template-id, we're actually silently creating a problem: 4311 // the friend declaration will refer to an untemplated decl, 4312 // and clearly the user wants a template specialization. So 4313 // we need to insert '<>' after the name. 4314 SourceLocation InsertLoc; 4315 if (D.getName().getKind() != UnqualifiedId::IK_TemplateId) { 4316 InsertLoc = D.getName().getSourceRange().getEnd(); 4317 InsertLoc = PP.getLocForEndOfToken(InsertLoc); 4318 } 4319 4320 Diag(D.getIdentifierLoc(), diag::err_template_spec_decl_friend) 4321 << Name << RemoveRange 4322 << FixItHint::CreateRemoval(RemoveRange) 4323 << FixItHint::CreateInsertion(InsertLoc, "<>"); 4324 } 4325 } 4326 } 4327 else { 4328 // All template param lists were matched against the scope specifier: 4329 // this is NOT (an explicit specialization of) a template. 4330 if (TemplateParamLists.size() > 0) 4331 // For source fidelity, store all the template param lists. 4332 NewFD->setTemplateParameterListsInfo(Context, 4333 TemplateParamLists.size(), 4334 TemplateParamLists.release()); 4335 } 4336 4337 if (Invalid) { 4338 NewFD->setInvalidDecl(); 4339 if (FunctionTemplate) 4340 FunctionTemplate->setInvalidDecl(); 4341 } 4342 4343 // C++ [dcl.fct.spec]p5: 4344 // The virtual specifier shall only be used in declarations of 4345 // nonstatic class member functions that appear within a 4346 // member-specification of a class declaration; see 10.3. 4347 // 4348 if (isVirtual && !NewFD->isInvalidDecl()) { 4349 if (!isVirtualOkay) { 4350 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4351 diag::err_virtual_non_function); 4352 } else if (!CurContext->isRecord()) { 4353 // 'virtual' was specified outside of the class. 4354 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4355 diag::err_virtual_out_of_class) 4356 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 4357 } else if (NewFD->getDescribedFunctionTemplate()) { 4358 // C++ [temp.mem]p3: 4359 // A member function template shall not be virtual. 4360 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4361 diag::err_virtual_member_function_template) 4362 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 4363 } else { 4364 // Okay: Add virtual to the method. 4365 NewFD->setVirtualAsWritten(true); 4366 } 4367 } 4368 4369 // C++ [dcl.fct.spec]p3: 4370 // The inline specifier shall not appear on a block scope function declaration. 4371 if (isInline && !NewFD->isInvalidDecl()) { 4372 if (CurContext->isFunctionOrMethod()) { 4373 // 'inline' is not allowed on block scope function declaration. 4374 Diag(D.getDeclSpec().getInlineSpecLoc(), 4375 diag::err_inline_declaration_block_scope) << Name 4376 << FixItHint::CreateRemoval(D.getDeclSpec().getInlineSpecLoc()); 4377 } 4378 } 4379 4380 // C++ [dcl.fct.spec]p6: 4381 // The explicit specifier shall be used only in the declaration of a 4382 // constructor or conversion function within its class definition; see 12.3.1 4383 // and 12.3.2. 4384 if (isExplicit && !NewFD->isInvalidDecl()) { 4385 if (!CurContext->isRecord()) { 4386 // 'explicit' was specified outside of the class. 4387 Diag(D.getDeclSpec().getExplicitSpecLoc(), 4388 diag::err_explicit_out_of_class) 4389 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 4390 } else if (!isa<CXXConstructorDecl>(NewFD) && 4391 !isa<CXXConversionDecl>(NewFD)) { 4392 // 'explicit' was specified on a function that wasn't a constructor 4393 // or conversion function. 4394 Diag(D.getDeclSpec().getExplicitSpecLoc(), 4395 diag::err_explicit_non_ctor_or_conv_function) 4396 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 4397 } 4398 } 4399 4400 // Filter out previous declarations that don't match the scope. 4401 FilterLookupForScope(Previous, DC, S, NewFD->hasLinkage(), 4402 isExplicitSpecialization || 4403 isFunctionTemplateSpecialization); 4404 4405 if (isFriend) { 4406 // For now, claim that the objects have no previous declaration. 4407 if (FunctionTemplate) { 4408 FunctionTemplate->setObjectOfFriendDecl(false); 4409 FunctionTemplate->setAccess(AS_public); 4410 } 4411 NewFD->setObjectOfFriendDecl(false); 4412 NewFD->setAccess(AS_public); 4413 } 4414 4415 if (isa<CXXMethodDecl>(NewFD) && DC == CurContext && IsFunctionDefinition) { 4416 // A method is implicitly inline if it's defined in its class 4417 // definition. 4418 NewFD->setImplicitlyInline(); 4419 } 4420 4421 if (SC == SC_Static && isa<CXXMethodDecl>(NewFD) && 4422 !CurContext->isRecord()) { 4423 // C++ [class.static]p1: 4424 // A data or function member of a class may be declared static 4425 // in a class definition, in which case it is a static member of 4426 // the class. 4427 4428 // Complain about the 'static' specifier if it's on an out-of-line 4429 // member function definition. 4430 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4431 diag::err_static_out_of_line) 4432 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 4433 } 4434 } 4435 4436 // Handle GNU asm-label extension (encoded as an attribute). 4437 if (Expr *E = (Expr*) D.getAsmLabel()) { 4438 // The parser guarantees this is a string. 4439 StringLiteral *SE = cast<StringLiteral>(E); 4440 NewFD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), Context, 4441 SE->getString())); 4442 } 4443 4444 // Copy the parameter declarations from the declarator D to the function 4445 // declaration NewFD, if they are available. First scavenge them into Params. 4446 llvm::SmallVector<ParmVarDecl*, 16> Params; 4447 if (D.isFunctionDeclarator()) { 4448 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 4449 4450 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 4451 // function that takes no arguments, not a function that takes a 4452 // single void argument. 4453 // We let through "const void" here because Sema::GetTypeForDeclarator 4454 // already checks for that case. 4455 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 4456 FTI.ArgInfo[0].Param && 4457 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()) { 4458 // Empty arg list, don't push any params. 4459 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[0].Param); 4460 4461 // In C++, the empty parameter-type-list must be spelled "void"; a 4462 // typedef of void is not permitted. 4463 if (getLangOptions().CPlusPlus && 4464 Param->getType().getUnqualifiedType() != Context.VoidTy) { 4465 bool IsTypeAlias = false; 4466 if (const TypedefType *TT = Param->getType()->getAs<TypedefType>()) 4467 IsTypeAlias = isa<TypeAliasDecl>(TT->getDecl()); 4468 else if (const TemplateSpecializationType *TST = 4469 Param->getType()->getAs<TemplateSpecializationType>()) 4470 IsTypeAlias = TST->isTypeAlias(); 4471 Diag(Param->getLocation(), diag::err_param_typedef_of_void) 4472 << IsTypeAlias; 4473 } 4474 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 4475 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 4476 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 4477 assert(Param->getDeclContext() != NewFD && "Was set before ?"); 4478 Param->setDeclContext(NewFD); 4479 Params.push_back(Param); 4480 4481 if (Param->isInvalidDecl()) 4482 NewFD->setInvalidDecl(); 4483 } 4484 } 4485 4486 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) { 4487 // When we're declaring a function with a typedef, typeof, etc as in the 4488 // following example, we'll need to synthesize (unnamed) 4489 // parameters for use in the declaration. 4490 // 4491 // @code 4492 // typedef void fn(int); 4493 // fn f; 4494 // @endcode 4495 4496 // Synthesize a parameter for each argument type. 4497 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 4498 AE = FT->arg_type_end(); AI != AE; ++AI) { 4499 ParmVarDecl *Param = 4500 BuildParmVarDeclForTypedef(NewFD, D.getIdentifierLoc(), *AI); 4501 Param->setScopeInfo(0, Params.size()); 4502 Params.push_back(Param); 4503 } 4504 } else { 4505 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && 4506 "Should not need args for typedef of non-prototype fn"); 4507 } 4508 // Finally, we know we have the right number of parameters, install them. 4509 NewFD->setParams(Params.data(), Params.size()); 4510 4511 // Process the non-inheritable attributes on this declaration. 4512 ProcessDeclAttributes(S, NewFD, D, 4513 /*NonInheritable=*/true, /*Inheritable=*/false); 4514 4515 if (!getLangOptions().CPlusPlus) { 4516 // Perform semantic checking on the function declaration. 4517 bool isExplctSpecialization=false; 4518 CheckFunctionDeclaration(S, NewFD, Previous, isExplctSpecialization, 4519 Redeclaration); 4520 assert((NewFD->isInvalidDecl() || !Redeclaration || 4521 Previous.getResultKind() != LookupResult::FoundOverloaded) && 4522 "previous declaration set still overloaded"); 4523 } else { 4524 // If the declarator is a template-id, translate the parser's template 4525 // argument list into our AST format. 4526 bool HasExplicitTemplateArgs = false; 4527 TemplateArgumentListInfo TemplateArgs; 4528 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) { 4529 TemplateIdAnnotation *TemplateId = D.getName().TemplateId; 4530 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc); 4531 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc); 4532 ASTTemplateArgsPtr TemplateArgsPtr(*this, 4533 TemplateId->getTemplateArgs(), 4534 TemplateId->NumArgs); 4535 translateTemplateArguments(TemplateArgsPtr, 4536 TemplateArgs); 4537 TemplateArgsPtr.release(); 4538 4539 HasExplicitTemplateArgs = true; 4540 4541 if (FunctionTemplate) { 4542 // Function template with explicit template arguments. 4543 Diag(D.getIdentifierLoc(), diag::err_function_template_partial_spec) 4544 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc); 4545 4546 HasExplicitTemplateArgs = false; 4547 } else if (!isFunctionTemplateSpecialization && 4548 !D.getDeclSpec().isFriendSpecified()) { 4549 // We have encountered something that the user meant to be a 4550 // specialization (because it has explicitly-specified template 4551 // arguments) but that was not introduced with a "template<>" (or had 4552 // too few of them). 4553 Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header) 4554 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc) 4555 << FixItHint::CreateInsertion( 4556 D.getDeclSpec().getSourceRange().getBegin(), 4557 "template<> "); 4558 isFunctionTemplateSpecialization = true; 4559 } else { 4560 // "friend void foo<>(int);" is an implicit specialization decl. 4561 isFunctionTemplateSpecialization = true; 4562 } 4563 } else if (isFriend && isFunctionTemplateSpecialization) { 4564 // This combination is only possible in a recovery case; the user 4565 // wrote something like: 4566 // template <> friend void foo(int); 4567 // which we're recovering from as if the user had written: 4568 // friend void foo<>(int); 4569 // Go ahead and fake up a template id. 4570 HasExplicitTemplateArgs = true; 4571 TemplateArgs.setLAngleLoc(D.getIdentifierLoc()); 4572 TemplateArgs.setRAngleLoc(D.getIdentifierLoc()); 4573 } 4574 4575 // If it's a friend (and only if it's a friend), it's possible 4576 // that either the specialized function type or the specialized 4577 // template is dependent, and therefore matching will fail. In 4578 // this case, don't check the specialization yet. 4579 if (isFunctionTemplateSpecialization && isFriend && 4580 (NewFD->getType()->isDependentType() || DC->isDependentContext())) { 4581 assert(HasExplicitTemplateArgs && 4582 "friend function specialization without template args"); 4583 if (CheckDependentFunctionTemplateSpecialization(NewFD, TemplateArgs, 4584 Previous)) 4585 NewFD->setInvalidDecl(); 4586 } else if (isFunctionTemplateSpecialization) { 4587 if (CurContext->isDependentContext() && CurContext->isRecord() 4588 && !isFriend && !getLangOptions().Microsoft) { 4589 Diag(NewFD->getLocation(), diag::err_function_specialization_in_class) 4590 << NewFD->getDeclName(); 4591 NewFD->setInvalidDecl(); 4592 return 0; 4593 } else if (CheckFunctionTemplateSpecialization(NewFD, 4594 (HasExplicitTemplateArgs ? &TemplateArgs : 0), 4595 Previous)) 4596 NewFD->setInvalidDecl(); 4597 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD)) { 4598 if (CheckMemberSpecialization(NewFD, Previous)) 4599 NewFD->setInvalidDecl(); 4600 } 4601 4602 // Perform semantic checking on the function declaration. 4603 CheckFunctionDeclaration(S, NewFD, Previous, isExplicitSpecialization, 4604 Redeclaration); 4605 4606 assert((NewFD->isInvalidDecl() || !Redeclaration || 4607 Previous.getResultKind() != LookupResult::FoundOverloaded) && 4608 "previous declaration set still overloaded"); 4609 4610 NamedDecl *PrincipalDecl = (FunctionTemplate 4611 ? cast<NamedDecl>(FunctionTemplate) 4612 : NewFD); 4613 4614 if (isFriend && Redeclaration) { 4615 AccessSpecifier Access = AS_public; 4616 if (!NewFD->isInvalidDecl()) 4617 Access = NewFD->getPreviousDeclaration()->getAccess(); 4618 4619 NewFD->setAccess(Access); 4620 if (FunctionTemplate) FunctionTemplate->setAccess(Access); 4621 4622 PrincipalDecl->setObjectOfFriendDecl(true); 4623 } 4624 4625 if (NewFD->isOverloadedOperator() && !DC->isRecord() && 4626 PrincipalDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary)) 4627 PrincipalDecl->setNonMemberOperator(); 4628 4629 // If we have a function template, check the template parameter 4630 // list. This will check and merge default template arguments. 4631 if (FunctionTemplate) { 4632 FunctionTemplateDecl *PrevTemplate = FunctionTemplate->getPreviousDeclaration(); 4633 CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(), 4634 PrevTemplate? PrevTemplate->getTemplateParameters() : 0, 4635 D.getDeclSpec().isFriendSpecified() 4636 ? (IsFunctionDefinition 4637 ? TPC_FriendFunctionTemplateDefinition 4638 : TPC_FriendFunctionTemplate) 4639 : (D.getCXXScopeSpec().isSet() && 4640 DC && DC->isRecord() && 4641 DC->isDependentContext()) 4642 ? TPC_ClassTemplateMember 4643 : TPC_FunctionTemplate); 4644 } 4645 4646 if (NewFD->isInvalidDecl()) { 4647 // Ignore all the rest of this. 4648 } else if (!Redeclaration) { 4649 // Fake up an access specifier if it's supposed to be a class member. 4650 if (isa<CXXRecordDecl>(NewFD->getDeclContext())) 4651 NewFD->setAccess(AS_public); 4652 4653 // Qualified decls generally require a previous declaration. 4654 if (D.getCXXScopeSpec().isSet()) { 4655 // ...with the major exception of templated-scope or 4656 // dependent-scope friend declarations. 4657 4658 // TODO: we currently also suppress this check in dependent 4659 // contexts because (1) the parameter depth will be off when 4660 // matching friend templates and (2) we might actually be 4661 // selecting a friend based on a dependent factor. But there 4662 // are situations where these conditions don't apply and we 4663 // can actually do this check immediately. 4664 if (isFriend && 4665 (TemplateParamLists.size() || 4666 D.getCXXScopeSpec().getScopeRep()->isDependent() || 4667 CurContext->isDependentContext())) { 4668 // ignore these 4669 } else { 4670 // The user tried to provide an out-of-line definition for a 4671 // function that is a member of a class or namespace, but there 4672 // was no such member function declared (C++ [class.mfct]p2, 4673 // C++ [namespace.memdef]p2). For example: 4674 // 4675 // class X { 4676 // void f() const; 4677 // }; 4678 // 4679 // void X::f() { } // ill-formed 4680 // 4681 // Complain about this problem, and attempt to suggest close 4682 // matches (e.g., those that differ only in cv-qualifiers and 4683 // whether the parameter types are references). 4684 Diag(D.getIdentifierLoc(), diag::err_member_def_does_not_match) 4685 << Name << DC << D.getCXXScopeSpec().getRange(); 4686 NewFD->setInvalidDecl(); 4687 4688 DiagnoseInvalidRedeclaration(*this, NewFD); 4689 } 4690 4691 // Unqualified local friend declarations are required to resolve 4692 // to something. 4693 } else if (isFriend && cast<CXXRecordDecl>(CurContext)->isLocalClass()) { 4694 Diag(D.getIdentifierLoc(), diag::err_no_matching_local_friend); 4695 NewFD->setInvalidDecl(); 4696 DiagnoseInvalidRedeclaration(*this, NewFD); 4697 } 4698 4699 } else if (!IsFunctionDefinition && D.getCXXScopeSpec().isSet() && 4700 !isFriend && !isFunctionTemplateSpecialization && 4701 !isExplicitSpecialization) { 4702 // An out-of-line member function declaration must also be a 4703 // definition (C++ [dcl.meaning]p1). 4704 // Note that this is not the case for explicit specializations of 4705 // function templates or member functions of class templates, per 4706 // C++ [temp.expl.spec]p2. We also allow these declarations as an extension 4707 // for compatibility with old SWIG code which likes to generate them. 4708 Diag(NewFD->getLocation(), diag::ext_out_of_line_declaration) 4709 << D.getCXXScopeSpec().getRange(); 4710 } 4711 } 4712 4713 4714 // Handle attributes. We need to have merged decls when handling attributes 4715 // (for example to check for conflicts, etc). 4716 // FIXME: This needs to happen before we merge declarations. Then, 4717 // let attribute merging cope with attribute conflicts. 4718 ProcessDeclAttributes(S, NewFD, D, 4719 /*NonInheritable=*/false, /*Inheritable=*/true); 4720 4721 // attributes declared post-definition are currently ignored 4722 // FIXME: This should happen during attribute merging 4723 if (Redeclaration && Previous.isSingleResult()) { 4724 const FunctionDecl *Def; 4725 FunctionDecl *PrevFD = dyn_cast<FunctionDecl>(Previous.getFoundDecl()); 4726 if (PrevFD && PrevFD->isDefined(Def) && D.hasAttributes()) { 4727 Diag(NewFD->getLocation(), diag::warn_attribute_precede_definition); 4728 Diag(Def->getLocation(), diag::note_previous_definition); 4729 } 4730 } 4731 4732 AddKnownFunctionAttributes(NewFD); 4733 4734 if (NewFD->hasAttr<OverloadableAttr>() && 4735 !NewFD->getType()->getAs<FunctionProtoType>()) { 4736 Diag(NewFD->getLocation(), 4737 diag::err_attribute_overloadable_no_prototype) 4738 << NewFD; 4739 4740 // Turn this into a variadic function with no parameters. 4741 const FunctionType *FT = NewFD->getType()->getAs<FunctionType>(); 4742 FunctionProtoType::ExtProtoInfo EPI; 4743 EPI.Variadic = true; 4744 EPI.ExtInfo = FT->getExtInfo(); 4745 4746 QualType R = Context.getFunctionType(FT->getResultType(), 0, 0, EPI); 4747 NewFD->setType(R); 4748 } 4749 4750 // If there's a #pragma GCC visibility in scope, and this isn't a class 4751 // member, set the visibility of this function. 4752 if (NewFD->getLinkage() == ExternalLinkage && !DC->isRecord()) 4753 AddPushedVisibilityAttribute(NewFD); 4754 4755 // If this is a locally-scoped extern C function, update the 4756 // map of such names. 4757 if (CurContext->isFunctionOrMethod() && NewFD->isExternC() 4758 && !NewFD->isInvalidDecl()) 4759 RegisterLocallyScopedExternCDecl(NewFD, Previous, S); 4760 4761 // Set this FunctionDecl's range up to the right paren. 4762 NewFD->setRangeEnd(D.getSourceRange().getEnd()); 4763 4764 if (getLangOptions().CPlusPlus) { 4765 if (FunctionTemplate) { 4766 if (NewFD->isInvalidDecl()) 4767 FunctionTemplate->setInvalidDecl(); 4768 return FunctionTemplate; 4769 } 4770 } 4771 4772 MarkUnusedFileScopedDecl(NewFD); 4773 4774 if (getLangOptions().CUDA) 4775 if (IdentifierInfo *II = NewFD->getIdentifier()) 4776 if (!NewFD->isInvalidDecl() && 4777 NewFD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 4778 if (II->isStr("cudaConfigureCall")) { 4779 if (!R->getAs<FunctionType>()->getResultType()->isScalarType()) 4780 Diag(NewFD->getLocation(), diag::err_config_scalar_return); 4781 4782 Context.setcudaConfigureCallDecl(NewFD); 4783 } 4784 } 4785 4786 return NewFD; 4787} 4788 4789/// \brief Perform semantic checking of a new function declaration. 4790/// 4791/// Performs semantic analysis of the new function declaration 4792/// NewFD. This routine performs all semantic checking that does not 4793/// require the actual declarator involved in the declaration, and is 4794/// used both for the declaration of functions as they are parsed 4795/// (called via ActOnDeclarator) and for the declaration of functions 4796/// that have been instantiated via C++ template instantiation (called 4797/// via InstantiateDecl). 4798/// 4799/// \param IsExplicitSpecialiation whether this new function declaration is 4800/// an explicit specialization of the previous declaration. 4801/// 4802/// This sets NewFD->isInvalidDecl() to true if there was an error. 4803void Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD, 4804 LookupResult &Previous, 4805 bool IsExplicitSpecialization, 4806 bool &Redeclaration) { 4807 // If NewFD is already known erroneous, don't do any of this checking. 4808 if (NewFD->isInvalidDecl()) { 4809 // If this is a class member, mark the class invalid immediately. 4810 // This avoids some consistency errors later. 4811 if (isa<CXXMethodDecl>(NewFD)) 4812 cast<CXXMethodDecl>(NewFD)->getParent()->setInvalidDecl(); 4813 4814 return; 4815 } 4816 4817 if (NewFD->getResultType()->isVariablyModifiedType()) { 4818 // Functions returning a variably modified type violate C99 6.7.5.2p2 4819 // because all functions have linkage. 4820 Diag(NewFD->getLocation(), diag::err_vm_func_decl); 4821 return NewFD->setInvalidDecl(); 4822 } 4823 4824 if (NewFD->isMain()) 4825 CheckMain(NewFD); 4826 4827 // Check for a previous declaration of this name. 4828 if (Previous.empty() && NewFD->isExternC()) { 4829 // Since we did not find anything by this name and we're declaring 4830 // an extern "C" function, look for a non-visible extern "C" 4831 // declaration with the same name. 4832 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 4833 = LocallyScopedExternalDecls.find(NewFD->getDeclName()); 4834 if (Pos != LocallyScopedExternalDecls.end()) 4835 Previous.addDecl(Pos->second); 4836 } 4837 4838 // Merge or overload the declaration with an existing declaration of 4839 // the same name, if appropriate. 4840 if (!Previous.empty()) { 4841 // Determine whether NewFD is an overload of PrevDecl or 4842 // a declaration that requires merging. If it's an overload, 4843 // there's no more work to do here; we'll just add the new 4844 // function to the scope. 4845 4846 NamedDecl *OldDecl = 0; 4847 if (!AllowOverloadingOfFunction(Previous, Context)) { 4848 Redeclaration = true; 4849 OldDecl = Previous.getFoundDecl(); 4850 } else { 4851 switch (CheckOverload(S, NewFD, Previous, OldDecl, 4852 /*NewIsUsingDecl*/ false)) { 4853 case Ovl_Match: 4854 Redeclaration = true; 4855 break; 4856 4857 case Ovl_NonFunction: 4858 Redeclaration = true; 4859 break; 4860 4861 case Ovl_Overload: 4862 Redeclaration = false; 4863 break; 4864 } 4865 4866 if (!getLangOptions().CPlusPlus && !NewFD->hasAttr<OverloadableAttr>()) { 4867 // If a function name is overloadable in C, then every function 4868 // with that name must be marked "overloadable". 4869 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 4870 << Redeclaration << NewFD; 4871 NamedDecl *OverloadedDecl = 0; 4872 if (Redeclaration) 4873 OverloadedDecl = OldDecl; 4874 else if (!Previous.empty()) 4875 OverloadedDecl = Previous.getRepresentativeDecl(); 4876 if (OverloadedDecl) 4877 Diag(OverloadedDecl->getLocation(), 4878 diag::note_attribute_overloadable_prev_overload); 4879 NewFD->addAttr(::new (Context) OverloadableAttr(SourceLocation(), 4880 Context)); 4881 } 4882 } 4883 4884 if (Redeclaration) { 4885 // NewFD and OldDecl represent declarations that need to be 4886 // merged. 4887 if (MergeFunctionDecl(NewFD, OldDecl)) 4888 return NewFD->setInvalidDecl(); 4889 4890 Previous.clear(); 4891 Previous.addDecl(OldDecl); 4892 4893 if (FunctionTemplateDecl *OldTemplateDecl 4894 = dyn_cast<FunctionTemplateDecl>(OldDecl)) { 4895 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl()); 4896 FunctionTemplateDecl *NewTemplateDecl 4897 = NewFD->getDescribedFunctionTemplate(); 4898 assert(NewTemplateDecl && "Template/non-template mismatch"); 4899 if (CXXMethodDecl *Method 4900 = dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) { 4901 Method->setAccess(OldTemplateDecl->getAccess()); 4902 NewTemplateDecl->setAccess(OldTemplateDecl->getAccess()); 4903 } 4904 4905 // If this is an explicit specialization of a member that is a function 4906 // template, mark it as a member specialization. 4907 if (IsExplicitSpecialization && 4908 NewTemplateDecl->getInstantiatedFromMemberTemplate()) { 4909 NewTemplateDecl->setMemberSpecialization(); 4910 assert(OldTemplateDecl->isMemberSpecialization()); 4911 } 4912 } else { 4913 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions 4914 NewFD->setAccess(OldDecl->getAccess()); 4915 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 4916 } 4917 } 4918 } 4919 4920 // Semantic checking for this function declaration (in isolation). 4921 if (getLangOptions().CPlusPlus) { 4922 // C++-specific checks. 4923 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { 4924 CheckConstructor(Constructor); 4925 } else if (CXXDestructorDecl *Destructor = 4926 dyn_cast<CXXDestructorDecl>(NewFD)) { 4927 CXXRecordDecl *Record = Destructor->getParent(); 4928 QualType ClassType = Context.getTypeDeclType(Record); 4929 4930 // FIXME: Shouldn't we be able to perform this check even when the class 4931 // type is dependent? Both gcc and edg can handle that. 4932 if (!ClassType->isDependentType()) { 4933 DeclarationName Name 4934 = Context.DeclarationNames.getCXXDestructorName( 4935 Context.getCanonicalType(ClassType)); 4936 if (NewFD->getDeclName() != Name) { 4937 Diag(NewFD->getLocation(), diag::err_destructor_name); 4938 return NewFD->setInvalidDecl(); 4939 } 4940 } 4941 } else if (CXXConversionDecl *Conversion 4942 = dyn_cast<CXXConversionDecl>(NewFD)) { 4943 ActOnConversionDeclarator(Conversion); 4944 } 4945 4946 // Find any virtual functions that this function overrides. 4947 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) { 4948 if (!Method->isFunctionTemplateSpecialization() && 4949 !Method->getDescribedFunctionTemplate()) { 4950 if (AddOverriddenMethods(Method->getParent(), Method)) { 4951 // If the function was marked as "static", we have a problem. 4952 if (NewFD->getStorageClass() == SC_Static) { 4953 Diag(NewFD->getLocation(), diag::err_static_overrides_virtual) 4954 << NewFD->getDeclName(); 4955 for (CXXMethodDecl::method_iterator 4956 Overridden = Method->begin_overridden_methods(), 4957 OverriddenEnd = Method->end_overridden_methods(); 4958 Overridden != OverriddenEnd; 4959 ++Overridden) { 4960 Diag((*Overridden)->getLocation(), 4961 diag::note_overridden_virtual_function); 4962 } 4963 } 4964 } 4965 } 4966 } 4967 4968 // Extra checking for C++ overloaded operators (C++ [over.oper]). 4969 if (NewFD->isOverloadedOperator() && 4970 CheckOverloadedOperatorDeclaration(NewFD)) 4971 return NewFD->setInvalidDecl(); 4972 4973 // Extra checking for C++0x literal operators (C++0x [over.literal]). 4974 if (NewFD->getLiteralIdentifier() && 4975 CheckLiteralOperatorDeclaration(NewFD)) 4976 return NewFD->setInvalidDecl(); 4977 4978 // In C++, check default arguments now that we have merged decls. Unless 4979 // the lexical context is the class, because in this case this is done 4980 // during delayed parsing anyway. 4981 if (!CurContext->isRecord()) 4982 CheckCXXDefaultArguments(NewFD); 4983 4984 // If this function declares a builtin function, check the type of this 4985 // declaration against the expected type for the builtin. 4986 if (unsigned BuiltinID = NewFD->getBuiltinID()) { 4987 ASTContext::GetBuiltinTypeError Error; 4988 QualType T = Context.GetBuiltinType(BuiltinID, Error); 4989 if (!T.isNull() && !Context.hasSameType(T, NewFD->getType())) { 4990 // The type of this function differs from the type of the builtin, 4991 // so forget about the builtin entirely. 4992 Context.BuiltinInfo.ForgetBuiltin(BuiltinID, Context.Idents); 4993 } 4994 } 4995 } 4996} 4997 4998void Sema::CheckMain(FunctionDecl* FD) { 4999 // C++ [basic.start.main]p3: A program that declares main to be inline 5000 // or static is ill-formed. 5001 // C99 6.7.4p4: In a hosted environment, the inline function specifier 5002 // shall not appear in a declaration of main. 5003 // static main is not an error under C99, but we should warn about it. 5004 bool isInline = FD->isInlineSpecified(); 5005 bool isStatic = FD->getStorageClass() == SC_Static; 5006 if (isInline || isStatic) { 5007 unsigned diagID = diag::warn_unusual_main_decl; 5008 if (isInline || getLangOptions().CPlusPlus) 5009 diagID = diag::err_unusual_main_decl; 5010 5011 int which = isStatic + (isInline << 1) - 1; 5012 Diag(FD->getLocation(), diagID) << which; 5013 } 5014 5015 QualType T = FD->getType(); 5016 assert(T->isFunctionType() && "function decl is not of function type"); 5017 const FunctionType* FT = T->getAs<FunctionType>(); 5018 5019 if (!Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) { 5020 Diag(FD->getTypeSpecStartLoc(), diag::err_main_returns_nonint); 5021 FD->setInvalidDecl(true); 5022 } 5023 5024 // Treat protoless main() as nullary. 5025 if (isa<FunctionNoProtoType>(FT)) return; 5026 5027 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT); 5028 unsigned nparams = FTP->getNumArgs(); 5029 assert(FD->getNumParams() == nparams); 5030 5031 bool HasExtraParameters = (nparams > 3); 5032 5033 // Darwin passes an undocumented fourth argument of type char**. If 5034 // other platforms start sprouting these, the logic below will start 5035 // getting shifty. 5036 if (nparams == 4 && Context.Target.getTriple().isOSDarwin()) 5037 HasExtraParameters = false; 5038 5039 if (HasExtraParameters) { 5040 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams; 5041 FD->setInvalidDecl(true); 5042 nparams = 3; 5043 } 5044 5045 // FIXME: a lot of the following diagnostics would be improved 5046 // if we had some location information about types. 5047 5048 QualType CharPP = 5049 Context.getPointerType(Context.getPointerType(Context.CharTy)); 5050 QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP }; 5051 5052 for (unsigned i = 0; i < nparams; ++i) { 5053 QualType AT = FTP->getArgType(i); 5054 5055 bool mismatch = true; 5056 5057 if (Context.hasSameUnqualifiedType(AT, Expected[i])) 5058 mismatch = false; 5059 else if (Expected[i] == CharPP) { 5060 // As an extension, the following forms are okay: 5061 // char const ** 5062 // char const * const * 5063 // char * const * 5064 5065 QualifierCollector qs; 5066 const PointerType* PT; 5067 if ((PT = qs.strip(AT)->getAs<PointerType>()) && 5068 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) && 5069 (QualType(qs.strip(PT->getPointeeType()), 0) == Context.CharTy)) { 5070 qs.removeConst(); 5071 mismatch = !qs.empty(); 5072 } 5073 } 5074 5075 if (mismatch) { 5076 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i]; 5077 // TODO: suggest replacing given type with expected type 5078 FD->setInvalidDecl(true); 5079 } 5080 } 5081 5082 if (nparams == 1 && !FD->isInvalidDecl()) { 5083 Diag(FD->getLocation(), diag::warn_main_one_arg); 5084 } 5085 5086 if (!FD->isInvalidDecl() && FD->getDescribedFunctionTemplate()) { 5087 Diag(FD->getLocation(), diag::err_main_template_decl); 5088 FD->setInvalidDecl(); 5089 } 5090} 5091 5092bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 5093 // FIXME: Need strict checking. In C89, we need to check for 5094 // any assignment, increment, decrement, function-calls, or 5095 // commas outside of a sizeof. In C99, it's the same list, 5096 // except that the aforementioned are allowed in unevaluated 5097 // expressions. Everything else falls under the 5098 // "may accept other forms of constant expressions" exception. 5099 // (We never end up here for C++, so the constant expression 5100 // rules there don't matter.) 5101 if (Init->isConstantInitializer(Context, false)) 5102 return false; 5103 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 5104 << Init->getSourceRange(); 5105 return true; 5106} 5107 5108namespace { 5109 // Visits an initialization expression to see if OrigDecl is evaluated in 5110 // its own initialization and throws a warning if it does. 5111 class SelfReferenceChecker 5112 : public EvaluatedExprVisitor<SelfReferenceChecker> { 5113 Sema &S; 5114 Decl *OrigDecl; 5115 5116 public: 5117 typedef EvaluatedExprVisitor<SelfReferenceChecker> Inherited; 5118 5119 SelfReferenceChecker(Sema &S, Decl *OrigDecl) : Inherited(S.Context), 5120 S(S), OrigDecl(OrigDecl) { } 5121 5122 void VisitExpr(Expr *E) { 5123 if (isa<ObjCMessageExpr>(*E)) return; 5124 Inherited::VisitExpr(E); 5125 } 5126 5127 void VisitImplicitCastExpr(ImplicitCastExpr *E) { 5128 CheckForSelfReference(E); 5129 Inherited::VisitImplicitCastExpr(E); 5130 } 5131 5132 void CheckForSelfReference(ImplicitCastExpr *E) { 5133 if (E->getCastKind() != CK_LValueToRValue) return; 5134 Expr* SubExpr = E->getSubExpr()->IgnoreParenImpCasts(); 5135 DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(SubExpr); 5136 if (!DRE) return; 5137 Decl* ReferenceDecl = DRE->getDecl(); 5138 if (OrigDecl != ReferenceDecl) return; 5139 LookupResult Result(S, DRE->getNameInfo(), Sema::LookupOrdinaryName, 5140 Sema::NotForRedeclaration); 5141 S.Diag(SubExpr->getLocStart(), diag::warn_uninit_self_reference_in_init) 5142 << Result.getLookupName() << OrigDecl->getLocation() 5143 << SubExpr->getSourceRange(); 5144 } 5145 }; 5146} 5147 5148/// AddInitializerToDecl - Adds the initializer Init to the 5149/// declaration dcl. If DirectInit is true, this is C++ direct 5150/// initialization rather than copy initialization. 5151void Sema::AddInitializerToDecl(Decl *RealDecl, Expr *Init, 5152 bool DirectInit, bool TypeMayContainAuto) { 5153 // If there is no declaration, there was an error parsing it. Just ignore 5154 // the initializer. 5155 if (RealDecl == 0 || RealDecl->isInvalidDecl()) 5156 return; 5157 5158 // Check for self-references within variable initializers. 5159 if (VarDecl *vd = dyn_cast<VarDecl>(RealDecl)) { 5160 // Variables declared within a function/method body are handled 5161 // by a dataflow analysis. 5162 if (!vd->hasLocalStorage() && !vd->isStaticLocal()) 5163 SelfReferenceChecker(*this, RealDecl).VisitExpr(Init); 5164 } 5165 else { 5166 SelfReferenceChecker(*this, RealDecl).VisitExpr(Init); 5167 } 5168 5169 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 5170 // With declarators parsed the way they are, the parser cannot 5171 // distinguish between a normal initializer and a pure-specifier. 5172 // Thus this grotesque test. 5173 IntegerLiteral *IL; 5174 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 5175 Context.getCanonicalType(IL->getType()) == Context.IntTy) 5176 CheckPureMethod(Method, Init->getSourceRange()); 5177 else { 5178 Diag(Method->getLocation(), diag::err_member_function_initialization) 5179 << Method->getDeclName() << Init->getSourceRange(); 5180 Method->setInvalidDecl(); 5181 } 5182 return; 5183 } 5184 5185 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 5186 if (!VDecl) { 5187 if (getLangOptions().CPlusPlus && 5188 RealDecl->getLexicalDeclContext()->isRecord() && 5189 isa<NamedDecl>(RealDecl)) 5190 Diag(RealDecl->getLocation(), diag::err_member_initialization); 5191 else 5192 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 5193 RealDecl->setInvalidDecl(); 5194 return; 5195 } 5196 5197 // C++0x [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 5198 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 5199 TypeSourceInfo *DeducedType = 0; 5200 if (!DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType)) 5201 Diag(VDecl->getLocation(), diag::err_auto_var_deduction_failure) 5202 << VDecl->getDeclName() << VDecl->getType() << Init->getType() 5203 << Init->getSourceRange(); 5204 if (!DeducedType) { 5205 RealDecl->setInvalidDecl(); 5206 return; 5207 } 5208 VDecl->setTypeSourceInfo(DeducedType); 5209 VDecl->setType(DeducedType->getType()); 5210 5211 // If this is a redeclaration, check that the type we just deduced matches 5212 // the previously declared type. 5213 if (VarDecl *Old = VDecl->getPreviousDeclaration()) 5214 MergeVarDeclTypes(VDecl, Old); 5215 } 5216 5217 5218 // A definition must end up with a complete type, which means it must be 5219 // complete with the restriction that an array type might be completed by the 5220 // initializer; note that later code assumes this restriction. 5221 QualType BaseDeclType = VDecl->getType(); 5222 if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType)) 5223 BaseDeclType = Array->getElementType(); 5224 if (RequireCompleteType(VDecl->getLocation(), BaseDeclType, 5225 diag::err_typecheck_decl_incomplete_type)) { 5226 RealDecl->setInvalidDecl(); 5227 return; 5228 } 5229 5230 // The variable can not have an abstract class type. 5231 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 5232 diag::err_abstract_type_in_decl, 5233 AbstractVariableType)) 5234 VDecl->setInvalidDecl(); 5235 5236 const VarDecl *Def; 5237 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 5238 Diag(VDecl->getLocation(), diag::err_redefinition) 5239 << VDecl->getDeclName(); 5240 Diag(Def->getLocation(), diag::note_previous_definition); 5241 VDecl->setInvalidDecl(); 5242 return; 5243 } 5244 5245 const VarDecl* PrevInit = 0; 5246 if (getLangOptions().CPlusPlus) { 5247 // C++ [class.static.data]p4 5248 // If a static data member is of const integral or const 5249 // enumeration type, its declaration in the class definition can 5250 // specify a constant-initializer which shall be an integral 5251 // constant expression (5.19). In that case, the member can appear 5252 // in integral constant expressions. The member shall still be 5253 // defined in a namespace scope if it is used in the program and the 5254 // namespace scope definition shall not contain an initializer. 5255 // 5256 // We already performed a redefinition check above, but for static 5257 // data members we also need to check whether there was an in-class 5258 // declaration with an initializer. 5259 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 5260 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 5261 Diag(PrevInit->getLocation(), diag::note_previous_definition); 5262 return; 5263 } 5264 5265 if (VDecl->hasLocalStorage()) 5266 getCurFunction()->setHasBranchProtectedScope(); 5267 5268 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) { 5269 VDecl->setInvalidDecl(); 5270 return; 5271 } 5272 } 5273 5274 // Capture the variable that is being initialized and the style of 5275 // initialization. 5276 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 5277 5278 // FIXME: Poor source location information. 5279 InitializationKind Kind 5280 = DirectInit? InitializationKind::CreateDirect(VDecl->getLocation(), 5281 Init->getLocStart(), 5282 Init->getLocEnd()) 5283 : InitializationKind::CreateCopy(VDecl->getLocation(), 5284 Init->getLocStart()); 5285 5286 // Get the decls type and save a reference for later, since 5287 // CheckInitializerTypes may change it. 5288 QualType DclT = VDecl->getType(), SavT = DclT; 5289 if (VDecl->isLocalVarDecl()) { 5290 if (VDecl->hasExternalStorage()) { // C99 6.7.8p5 5291 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 5292 VDecl->setInvalidDecl(); 5293 } else if (!VDecl->isInvalidDecl()) { 5294 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 5295 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 5296 MultiExprArg(*this, &Init, 1), 5297 &DclT); 5298 if (Result.isInvalid()) { 5299 VDecl->setInvalidDecl(); 5300 return; 5301 } 5302 5303 Init = Result.takeAs<Expr>(); 5304 5305 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 5306 // Don't check invalid declarations to avoid emitting useless diagnostics. 5307 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 5308 if (VDecl->getStorageClass() == SC_Static) // C99 6.7.8p4. 5309 CheckForConstantInitializer(Init, DclT); 5310 } 5311 } 5312 } else if (VDecl->isStaticDataMember() && 5313 VDecl->getLexicalDeclContext()->isRecord()) { 5314 // This is an in-class initialization for a static data member, e.g., 5315 // 5316 // struct S { 5317 // static const int value = 17; 5318 // }; 5319 5320 // Try to perform the initialization regardless. 5321 if (!VDecl->isInvalidDecl()) { 5322 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 5323 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 5324 MultiExprArg(*this, &Init, 1), 5325 &DclT); 5326 if (Result.isInvalid()) { 5327 VDecl->setInvalidDecl(); 5328 return; 5329 } 5330 5331 Init = Result.takeAs<Expr>(); 5332 } 5333 5334 // C++ [class.mem]p4: 5335 // A member-declarator can contain a constant-initializer only 5336 // if it declares a static member (9.4) of const integral or 5337 // const enumeration type, see 9.4.2. 5338 QualType T = VDecl->getType(); 5339 5340 // Do nothing on dependent types. 5341 if (T->isDependentType()) { 5342 5343 // Require constness. 5344 } else if (!T.isConstQualified()) { 5345 Diag(VDecl->getLocation(), diag::err_in_class_initializer_non_const) 5346 << Init->getSourceRange(); 5347 VDecl->setInvalidDecl(); 5348 5349 // We allow integer constant expressions in all cases. 5350 } else if (T->isIntegralOrEnumerationType()) { 5351 if (!Init->isValueDependent()) { 5352 // Check whether the expression is a constant expression. 5353 llvm::APSInt Value; 5354 SourceLocation Loc; 5355 if (!Init->isIntegerConstantExpr(Value, Context, &Loc)) { 5356 Diag(Loc, diag::err_in_class_initializer_non_constant) 5357 << Init->getSourceRange(); 5358 VDecl->setInvalidDecl(); 5359 } 5360 } 5361 5362 // We allow floating-point constants as an extension in C++03, and 5363 // C++0x has far more complicated rules that we don't really 5364 // implement fully. 5365 } else { 5366 bool Allowed = false; 5367 if (getLangOptions().CPlusPlus0x) { 5368 Allowed = T->isLiteralType(); 5369 } else if (T->isFloatingType()) { // also permits complex, which is ok 5370 Diag(VDecl->getLocation(), diag::ext_in_class_initializer_float_type) 5371 << T << Init->getSourceRange(); 5372 Allowed = true; 5373 } 5374 5375 if (!Allowed) { 5376 Diag(VDecl->getLocation(), diag::err_in_class_initializer_bad_type) 5377 << T << Init->getSourceRange(); 5378 VDecl->setInvalidDecl(); 5379 5380 // TODO: there are probably expressions that pass here that shouldn't. 5381 } else if (!Init->isValueDependent() && 5382 !Init->isConstantInitializer(Context, false)) { 5383 Diag(Init->getExprLoc(), diag::err_in_class_initializer_non_constant) 5384 << Init->getSourceRange(); 5385 VDecl->setInvalidDecl(); 5386 } 5387 } 5388 } else if (VDecl->isFileVarDecl()) { 5389 if (VDecl->getStorageClassAsWritten() == SC_Extern && 5390 (!getLangOptions().CPlusPlus || 5391 !Context.getBaseElementType(VDecl->getType()).isConstQualified())) 5392 Diag(VDecl->getLocation(), diag::warn_extern_init); 5393 if (!VDecl->isInvalidDecl()) { 5394 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 5395 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 5396 MultiExprArg(*this, &Init, 1), 5397 &DclT); 5398 if (Result.isInvalid()) { 5399 VDecl->setInvalidDecl(); 5400 return; 5401 } 5402 5403 Init = Result.takeAs<Expr>(); 5404 } 5405 5406 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 5407 // Don't check invalid declarations to avoid emitting useless diagnostics. 5408 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 5409 // C99 6.7.8p4. All file scoped initializers need to be constant. 5410 CheckForConstantInitializer(Init, DclT); 5411 } 5412 } 5413 // If the type changed, it means we had an incomplete type that was 5414 // completed by the initializer. For example: 5415 // int ary[] = { 1, 3, 5 }; 5416 // "ary" transitions from a VariableArrayType to a ConstantArrayType. 5417 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 5418 VDecl->setType(DclT); 5419 Init->setType(DclT); 5420 } 5421 5422 5423 // If this variable is a local declaration with record type, make sure it 5424 // doesn't have a flexible member initialization. We only support this as a 5425 // global/static definition. 5426 if (VDecl->hasLocalStorage()) 5427 if (const RecordType *RT = VDecl->getType()->getAs<RecordType>()) 5428 if (RT->getDecl()->hasFlexibleArrayMember()) { 5429 // Check whether the initializer tries to initialize the flexible 5430 // array member itself to anything other than an empty initializer list. 5431 if (InitListExpr *ILE = dyn_cast<InitListExpr>(Init)) { 5432 unsigned Index = std::distance(RT->getDecl()->field_begin(), 5433 RT->getDecl()->field_end()) - 1; 5434 if (Index < ILE->getNumInits() && 5435 !(isa<InitListExpr>(ILE->getInit(Index)) && 5436 cast<InitListExpr>(ILE->getInit(Index))->getNumInits() == 0)) { 5437 Diag(VDecl->getLocation(), diag::err_nonstatic_flexible_variable); 5438 VDecl->setInvalidDecl(); 5439 } 5440 } 5441 } 5442 5443 // Check any implicit conversions within the expression. 5444 CheckImplicitConversions(Init, VDecl->getLocation()); 5445 5446 Init = MaybeCreateExprWithCleanups(Init); 5447 // Attach the initializer to the decl. 5448 VDecl->setInit(Init); 5449 5450 CheckCompleteVariableDeclaration(VDecl); 5451} 5452 5453/// ActOnInitializerError - Given that there was an error parsing an 5454/// initializer for the given declaration, try to return to some form 5455/// of sanity. 5456void Sema::ActOnInitializerError(Decl *D) { 5457 // Our main concern here is re-establishing invariants like "a 5458 // variable's type is either dependent or complete". 5459 if (!D || D->isInvalidDecl()) return; 5460 5461 VarDecl *VD = dyn_cast<VarDecl>(D); 5462 if (!VD) return; 5463 5464 // Auto types are meaningless if we can't make sense of the initializer. 5465 if (ParsingInitForAutoVars.count(D)) { 5466 D->setInvalidDecl(); 5467 return; 5468 } 5469 5470 QualType Ty = VD->getType(); 5471 if (Ty->isDependentType()) return; 5472 5473 // Require a complete type. 5474 if (RequireCompleteType(VD->getLocation(), 5475 Context.getBaseElementType(Ty), 5476 diag::err_typecheck_decl_incomplete_type)) { 5477 VD->setInvalidDecl(); 5478 return; 5479 } 5480 5481 // Require an abstract type. 5482 if (RequireNonAbstractType(VD->getLocation(), Ty, 5483 diag::err_abstract_type_in_decl, 5484 AbstractVariableType)) { 5485 VD->setInvalidDecl(); 5486 return; 5487 } 5488 5489 // Don't bother complaining about constructors or destructors, 5490 // though. 5491} 5492 5493void Sema::ActOnUninitializedDecl(Decl *RealDecl, 5494 bool TypeMayContainAuto) { 5495 // If there is no declaration, there was an error parsing it. Just ignore it. 5496 if (RealDecl == 0) 5497 return; 5498 5499 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 5500 QualType Type = Var->getType(); 5501 5502 // C++0x [dcl.spec.auto]p3 5503 if (TypeMayContainAuto && Type->getContainedAutoType()) { 5504 Diag(Var->getLocation(), diag::err_auto_var_requires_init) 5505 << Var->getDeclName() << Type; 5506 Var->setInvalidDecl(); 5507 return; 5508 } 5509 5510 switch (Var->isThisDeclarationADefinition()) { 5511 case VarDecl::Definition: 5512 if (!Var->isStaticDataMember() || !Var->getAnyInitializer()) 5513 break; 5514 5515 // We have an out-of-line definition of a static data member 5516 // that has an in-class initializer, so we type-check this like 5517 // a declaration. 5518 // 5519 // Fall through 5520 5521 case VarDecl::DeclarationOnly: 5522 // It's only a declaration. 5523 5524 // Block scope. C99 6.7p7: If an identifier for an object is 5525 // declared with no linkage (C99 6.2.2p6), the type for the 5526 // object shall be complete. 5527 if (!Type->isDependentType() && Var->isLocalVarDecl() && 5528 !Var->getLinkage() && !Var->isInvalidDecl() && 5529 RequireCompleteType(Var->getLocation(), Type, 5530 diag::err_typecheck_decl_incomplete_type)) 5531 Var->setInvalidDecl(); 5532 5533 // Make sure that the type is not abstract. 5534 if (!Type->isDependentType() && !Var->isInvalidDecl() && 5535 RequireNonAbstractType(Var->getLocation(), Type, 5536 diag::err_abstract_type_in_decl, 5537 AbstractVariableType)) 5538 Var->setInvalidDecl(); 5539 return; 5540 5541 case VarDecl::TentativeDefinition: 5542 // File scope. C99 6.9.2p2: A declaration of an identifier for an 5543 // object that has file scope without an initializer, and without a 5544 // storage-class specifier or with the storage-class specifier "static", 5545 // constitutes a tentative definition. Note: A tentative definition with 5546 // external linkage is valid (C99 6.2.2p5). 5547 if (!Var->isInvalidDecl()) { 5548 if (const IncompleteArrayType *ArrayT 5549 = Context.getAsIncompleteArrayType(Type)) { 5550 if (RequireCompleteType(Var->getLocation(), 5551 ArrayT->getElementType(), 5552 diag::err_illegal_decl_array_incomplete_type)) 5553 Var->setInvalidDecl(); 5554 } else if (Var->getStorageClass() == SC_Static) { 5555 // C99 6.9.2p3: If the declaration of an identifier for an object is 5556 // a tentative definition and has internal linkage (C99 6.2.2p3), the 5557 // declared type shall not be an incomplete type. 5558 // NOTE: code such as the following 5559 // static struct s; 5560 // struct s { int a; }; 5561 // is accepted by gcc. Hence here we issue a warning instead of 5562 // an error and we do not invalidate the static declaration. 5563 // NOTE: to avoid multiple warnings, only check the first declaration. 5564 if (Var->getPreviousDeclaration() == 0) 5565 RequireCompleteType(Var->getLocation(), Type, 5566 diag::ext_typecheck_decl_incomplete_type); 5567 } 5568 } 5569 5570 // Record the tentative definition; we're done. 5571 if (!Var->isInvalidDecl()) 5572 TentativeDefinitions.push_back(Var); 5573 return; 5574 } 5575 5576 // Provide a specific diagnostic for uninitialized variable 5577 // definitions with incomplete array type. 5578 if (Type->isIncompleteArrayType()) { 5579 Diag(Var->getLocation(), 5580 diag::err_typecheck_incomplete_array_needs_initializer); 5581 Var->setInvalidDecl(); 5582 return; 5583 } 5584 5585 // Provide a specific diagnostic for uninitialized variable 5586 // definitions with reference type. 5587 if (Type->isReferenceType()) { 5588 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 5589 << Var->getDeclName() 5590 << SourceRange(Var->getLocation(), Var->getLocation()); 5591 Var->setInvalidDecl(); 5592 return; 5593 } 5594 5595 // Do not attempt to type-check the default initializer for a 5596 // variable with dependent type. 5597 if (Type->isDependentType()) 5598 return; 5599 5600 if (Var->isInvalidDecl()) 5601 return; 5602 5603 if (RequireCompleteType(Var->getLocation(), 5604 Context.getBaseElementType(Type), 5605 diag::err_typecheck_decl_incomplete_type)) { 5606 Var->setInvalidDecl(); 5607 return; 5608 } 5609 5610 // The variable can not have an abstract class type. 5611 if (RequireNonAbstractType(Var->getLocation(), Type, 5612 diag::err_abstract_type_in_decl, 5613 AbstractVariableType)) { 5614 Var->setInvalidDecl(); 5615 return; 5616 } 5617 5618 const RecordType *Record 5619 = Context.getBaseElementType(Type)->getAs<RecordType>(); 5620 if (Record && getLangOptions().CPlusPlus && !getLangOptions().CPlusPlus0x && 5621 cast<CXXRecordDecl>(Record->getDecl())->isPOD()) { 5622 // C++03 [dcl.init]p9: 5623 // If no initializer is specified for an object, and the 5624 // object is of (possibly cv-qualified) non-POD class type (or 5625 // array thereof), the object shall be default-initialized; if 5626 // the object is of const-qualified type, the underlying class 5627 // type shall have a user-declared default 5628 // constructor. Otherwise, if no initializer is specified for 5629 // a non- static object, the object and its subobjects, if 5630 // any, have an indeterminate initial value); if the object 5631 // or any of its subobjects are of const-qualified type, the 5632 // program is ill-formed. 5633 // C++0x [dcl.init]p11: 5634 // If no initializer is specified for an object, the object is 5635 // default-initialized; [...]. 5636 } else { 5637 // Check for jumps past the implicit initializer. C++0x 5638 // clarifies that this applies to a "variable with automatic 5639 // storage duration", not a "local variable". 5640 // C++0x [stmt.dcl]p3 5641 // A program that jumps from a point where a variable with automatic 5642 // storage duration is not ins cope to a point where it is in scope is 5643 // ill-formed unless the variable has scalar type, class type with a 5644 // trivial defautl constructor and a trivial destructor, a cv-qualified 5645 // version of one of these types, or an array of one of the preceding 5646 // types and is declared without an initializer. 5647 if (getLangOptions().CPlusPlus && Var->hasLocalStorage() && Record) { 5648 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record->getDecl()); 5649 if (!getLangOptions().CPlusPlus0x || 5650 !CXXRecord->hasTrivialDefaultConstructor() || 5651 !CXXRecord->hasTrivialDestructor()) 5652 getCurFunction()->setHasBranchProtectedScope(); 5653 } 5654 5655 InitializedEntity Entity = InitializedEntity::InitializeVariable(Var); 5656 InitializationKind Kind 5657 = InitializationKind::CreateDefault(Var->getLocation()); 5658 5659 InitializationSequence InitSeq(*this, Entity, Kind, 0, 0); 5660 ExprResult Init = InitSeq.Perform(*this, Entity, Kind, 5661 MultiExprArg(*this, 0, 0)); 5662 if (Init.isInvalid()) 5663 Var->setInvalidDecl(); 5664 else if (Init.get()) 5665 Var->setInit(MaybeCreateExprWithCleanups(Init.get())); 5666 } 5667 5668 CheckCompleteVariableDeclaration(Var); 5669 } 5670} 5671 5672void Sema::ActOnCXXForRangeDecl(Decl *D) { 5673 VarDecl *VD = dyn_cast<VarDecl>(D); 5674 if (!VD) { 5675 Diag(D->getLocation(), diag::err_for_range_decl_must_be_var); 5676 D->setInvalidDecl(); 5677 return; 5678 } 5679 5680 VD->setCXXForRangeDecl(true); 5681 5682 // for-range-declaration cannot be given a storage class specifier. 5683 int Error = -1; 5684 switch (VD->getStorageClassAsWritten()) { 5685 case SC_None: 5686 break; 5687 case SC_Extern: 5688 Error = 0; 5689 break; 5690 case SC_Static: 5691 Error = 1; 5692 break; 5693 case SC_PrivateExtern: 5694 Error = 2; 5695 break; 5696 case SC_Auto: 5697 Error = 3; 5698 break; 5699 case SC_Register: 5700 Error = 4; 5701 break; 5702 } 5703 // FIXME: constexpr isn't allowed here. 5704 //if (DS.isConstexprSpecified()) 5705 // Error = 5; 5706 if (Error != -1) { 5707 Diag(VD->getOuterLocStart(), diag::err_for_range_storage_class) 5708 << VD->getDeclName() << Error; 5709 D->setInvalidDecl(); 5710 } 5711} 5712 5713void Sema::CheckCompleteVariableDeclaration(VarDecl *var) { 5714 if (var->isInvalidDecl()) return; 5715 5716 // All the following checks are C++ only. 5717 if (!getLangOptions().CPlusPlus) return; 5718 5719 QualType baseType = Context.getBaseElementType(var->getType()); 5720 if (baseType->isDependentType()) return; 5721 5722 // __block variables might require us to capture a copy-initializer. 5723 if (var->hasAttr<BlocksAttr>()) { 5724 // It's currently invalid to ever have a __block variable with an 5725 // array type; should we diagnose that here? 5726 5727 // Regardless, we don't want to ignore array nesting when 5728 // constructing this copy. 5729 QualType type = var->getType(); 5730 5731 if (type->isStructureOrClassType()) { 5732 SourceLocation poi = var->getLocation(); 5733 Expr *varRef = new (Context) DeclRefExpr(var, type, VK_LValue, poi); 5734 ExprResult result = 5735 PerformCopyInitialization( 5736 InitializedEntity::InitializeBlock(poi, type, false), 5737 poi, Owned(varRef)); 5738 if (!result.isInvalid()) { 5739 result = MaybeCreateExprWithCleanups(result); 5740 Expr *init = result.takeAs<Expr>(); 5741 Context.setBlockVarCopyInits(var, init); 5742 } 5743 } 5744 } 5745 5746 // Check for global constructors. 5747 if (!var->getDeclContext()->isDependentContext() && 5748 var->hasGlobalStorage() && 5749 !var->isStaticLocal() && 5750 var->getInit() && 5751 !var->getInit()->isConstantInitializer(Context, 5752 baseType->isReferenceType())) 5753 Diag(var->getLocation(), diag::warn_global_constructor) 5754 << var->getInit()->getSourceRange(); 5755 5756 // Require the destructor. 5757 if (const RecordType *recordType = baseType->getAs<RecordType>()) 5758 FinalizeVarWithDestructor(var, recordType); 5759} 5760 5761/// FinalizeDeclaration - called by ParseDeclarationAfterDeclarator to perform 5762/// any semantic actions necessary after any initializer has been attached. 5763void 5764Sema::FinalizeDeclaration(Decl *ThisDecl) { 5765 // Note that we are no longer parsing the initializer for this declaration. 5766 ParsingInitForAutoVars.erase(ThisDecl); 5767} 5768 5769Sema::DeclGroupPtrTy 5770Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, 5771 Decl **Group, unsigned NumDecls) { 5772 llvm::SmallVector<Decl*, 8> Decls; 5773 5774 if (DS.isTypeSpecOwned()) 5775 Decls.push_back(DS.getRepAsDecl()); 5776 5777 for (unsigned i = 0; i != NumDecls; ++i) 5778 if (Decl *D = Group[i]) 5779 Decls.push_back(D); 5780 5781 return BuildDeclaratorGroup(Decls.data(), Decls.size(), 5782 DS.getTypeSpecType() == DeclSpec::TST_auto); 5783} 5784 5785/// BuildDeclaratorGroup - convert a list of declarations into a declaration 5786/// group, performing any necessary semantic checking. 5787Sema::DeclGroupPtrTy 5788Sema::BuildDeclaratorGroup(Decl **Group, unsigned NumDecls, 5789 bool TypeMayContainAuto) { 5790 // C++0x [dcl.spec.auto]p7: 5791 // If the type deduced for the template parameter U is not the same in each 5792 // deduction, the program is ill-formed. 5793 // FIXME: When initializer-list support is added, a distinction is needed 5794 // between the deduced type U and the deduced type which 'auto' stands for. 5795 // auto a = 0, b = { 1, 2, 3 }; 5796 // is legal because the deduced type U is 'int' in both cases. 5797 if (TypeMayContainAuto && NumDecls > 1) { 5798 QualType Deduced; 5799 CanQualType DeducedCanon; 5800 VarDecl *DeducedDecl = 0; 5801 for (unsigned i = 0; i != NumDecls; ++i) { 5802 if (VarDecl *D = dyn_cast<VarDecl>(Group[i])) { 5803 AutoType *AT = D->getType()->getContainedAutoType(); 5804 // Don't reissue diagnostics when instantiating a template. 5805 if (AT && D->isInvalidDecl()) 5806 break; 5807 if (AT && AT->isDeduced()) { 5808 QualType U = AT->getDeducedType(); 5809 CanQualType UCanon = Context.getCanonicalType(U); 5810 if (Deduced.isNull()) { 5811 Deduced = U; 5812 DeducedCanon = UCanon; 5813 DeducedDecl = D; 5814 } else if (DeducedCanon != UCanon) { 5815 Diag(D->getTypeSourceInfo()->getTypeLoc().getBeginLoc(), 5816 diag::err_auto_different_deductions) 5817 << Deduced << DeducedDecl->getDeclName() 5818 << U << D->getDeclName() 5819 << DeducedDecl->getInit()->getSourceRange() 5820 << D->getInit()->getSourceRange(); 5821 D->setInvalidDecl(); 5822 break; 5823 } 5824 } 5825 } 5826 } 5827 } 5828 5829 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, NumDecls)); 5830} 5831 5832 5833/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 5834/// to introduce parameters into function prototype scope. 5835Decl *Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 5836 const DeclSpec &DS = D.getDeclSpec(); 5837 5838 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 5839 VarDecl::StorageClass StorageClass = SC_None; 5840 VarDecl::StorageClass StorageClassAsWritten = SC_None; 5841 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 5842 StorageClass = SC_Register; 5843 StorageClassAsWritten = SC_Register; 5844 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 5845 Diag(DS.getStorageClassSpecLoc(), 5846 diag::err_invalid_storage_class_in_func_decl); 5847 D.getMutableDeclSpec().ClearStorageClassSpecs(); 5848 } 5849 5850 if (D.getDeclSpec().isThreadSpecified()) 5851 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 5852 5853 DiagnoseFunctionSpecifiers(D); 5854 5855 TagDecl *OwnedDecl = 0; 5856 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S, &OwnedDecl); 5857 QualType parmDeclType = TInfo->getType(); 5858 5859 if (getLangOptions().CPlusPlus) { 5860 // Check that there are no default arguments inside the type of this 5861 // parameter. 5862 CheckExtraCXXDefaultArguments(D); 5863 5864 if (OwnedDecl && OwnedDecl->isDefinition()) { 5865 // C++ [dcl.fct]p6: 5866 // Types shall not be defined in return or parameter types. 5867 Diag(OwnedDecl->getLocation(), diag::err_type_defined_in_param_type) 5868 << Context.getTypeDeclType(OwnedDecl); 5869 } 5870 5871 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 5872 if (D.getCXXScopeSpec().isSet()) { 5873 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 5874 << D.getCXXScopeSpec().getRange(); 5875 D.getCXXScopeSpec().clear(); 5876 } 5877 } 5878 5879 // Ensure we have a valid name 5880 IdentifierInfo *II = 0; 5881 if (D.hasName()) { 5882 II = D.getIdentifier(); 5883 if (!II) { 5884 Diag(D.getIdentifierLoc(), diag::err_bad_parameter_name) 5885 << GetNameForDeclarator(D).getName().getAsString(); 5886 D.setInvalidType(true); 5887 } 5888 } 5889 5890 // Check for redeclaration of parameters, e.g. int foo(int x, int x); 5891 if (II) { 5892 LookupResult R(*this, II, D.getIdentifierLoc(), LookupOrdinaryName, 5893 ForRedeclaration); 5894 LookupName(R, S); 5895 if (R.isSingleResult()) { 5896 NamedDecl *PrevDecl = R.getFoundDecl(); 5897 if (PrevDecl->isTemplateParameter()) { 5898 // Maybe we will complain about the shadowed template parameter. 5899 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 5900 // Just pretend that we didn't see the previous declaration. 5901 PrevDecl = 0; 5902 } else if (S->isDeclScope(PrevDecl)) { 5903 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 5904 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 5905 5906 // Recover by removing the name 5907 II = 0; 5908 D.SetIdentifier(0, D.getIdentifierLoc()); 5909 D.setInvalidType(true); 5910 } 5911 } 5912 } 5913 5914 // Temporarily put parameter variables in the translation unit, not 5915 // the enclosing context. This prevents them from accidentally 5916 // looking like class members in C++. 5917 ParmVarDecl *New = CheckParameter(Context.getTranslationUnitDecl(), 5918 D.getSourceRange().getBegin(), 5919 D.getIdentifierLoc(), II, 5920 parmDeclType, TInfo, 5921 StorageClass, StorageClassAsWritten); 5922 5923 if (D.isInvalidType()) 5924 New->setInvalidDecl(); 5925 5926 assert(S->isFunctionPrototypeScope()); 5927 assert(S->getFunctionPrototypeDepth() >= 1); 5928 New->setScopeInfo(S->getFunctionPrototypeDepth() - 1, 5929 S->getNextFunctionPrototypeIndex()); 5930 5931 // Add the parameter declaration into this scope. 5932 S->AddDecl(New); 5933 if (II) 5934 IdResolver.AddDecl(New); 5935 5936 ProcessDeclAttributes(S, New, D); 5937 5938 if (New->hasAttr<BlocksAttr>()) { 5939 Diag(New->getLocation(), diag::err_block_on_nonlocal); 5940 } 5941 return New; 5942} 5943 5944/// \brief Synthesizes a variable for a parameter arising from a 5945/// typedef. 5946ParmVarDecl *Sema::BuildParmVarDeclForTypedef(DeclContext *DC, 5947 SourceLocation Loc, 5948 QualType T) { 5949 /* FIXME: setting StartLoc == Loc. 5950 Would it be worth to modify callers so as to provide proper source 5951 location for the unnamed parameters, embedding the parameter's type? */ 5952 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, Loc, Loc, 0, 5953 T, Context.getTrivialTypeSourceInfo(T, Loc), 5954 SC_None, SC_None, 0); 5955 Param->setImplicit(); 5956 return Param; 5957} 5958 5959void Sema::DiagnoseUnusedParameters(ParmVarDecl * const *Param, 5960 ParmVarDecl * const *ParamEnd) { 5961 // Don't diagnose unused-parameter errors in template instantiations; we 5962 // will already have done so in the template itself. 5963 if (!ActiveTemplateInstantiations.empty()) 5964 return; 5965 5966 for (; Param != ParamEnd; ++Param) { 5967 if (!(*Param)->isUsed() && (*Param)->getDeclName() && 5968 !(*Param)->hasAttr<UnusedAttr>()) { 5969 Diag((*Param)->getLocation(), diag::warn_unused_parameter) 5970 << (*Param)->getDeclName(); 5971 } 5972 } 5973} 5974 5975void Sema::DiagnoseSizeOfParametersAndReturnValue(ParmVarDecl * const *Param, 5976 ParmVarDecl * const *ParamEnd, 5977 QualType ReturnTy, 5978 NamedDecl *D) { 5979 if (LangOpts.NumLargeByValueCopy == 0) // No check. 5980 return; 5981 5982 // Warn if the return value is pass-by-value and larger than the specified 5983 // threshold. 5984 if (ReturnTy->isPODType()) { 5985 unsigned Size = Context.getTypeSizeInChars(ReturnTy).getQuantity(); 5986 if (Size > LangOpts.NumLargeByValueCopy) 5987 Diag(D->getLocation(), diag::warn_return_value_size) 5988 << D->getDeclName() << Size; 5989 } 5990 5991 // Warn if any parameter is pass-by-value and larger than the specified 5992 // threshold. 5993 for (; Param != ParamEnd; ++Param) { 5994 QualType T = (*Param)->getType(); 5995 if (!T->isPODType()) 5996 continue; 5997 unsigned Size = Context.getTypeSizeInChars(T).getQuantity(); 5998 if (Size > LangOpts.NumLargeByValueCopy) 5999 Diag((*Param)->getLocation(), diag::warn_parameter_size) 6000 << (*Param)->getDeclName() << Size; 6001 } 6002} 6003 6004ParmVarDecl *Sema::CheckParameter(DeclContext *DC, SourceLocation StartLoc, 6005 SourceLocation NameLoc, IdentifierInfo *Name, 6006 QualType T, TypeSourceInfo *TSInfo, 6007 VarDecl::StorageClass StorageClass, 6008 VarDecl::StorageClass StorageClassAsWritten) { 6009 ParmVarDecl *New = ParmVarDecl::Create(Context, DC, StartLoc, NameLoc, Name, 6010 adjustParameterType(T), TSInfo, 6011 StorageClass, StorageClassAsWritten, 6012 0); 6013 6014 // Parameters can not be abstract class types. 6015 // For record types, this is done by the AbstractClassUsageDiagnoser once 6016 // the class has been completely parsed. 6017 if (!CurContext->isRecord() && 6018 RequireNonAbstractType(NameLoc, T, diag::err_abstract_type_in_decl, 6019 AbstractParamType)) 6020 New->setInvalidDecl(); 6021 6022 // Parameter declarators cannot be interface types. All ObjC objects are 6023 // passed by reference. 6024 if (T->isObjCObjectType()) { 6025 Diag(NameLoc, 6026 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T; 6027 New->setInvalidDecl(); 6028 } 6029 6030 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage 6031 // duration shall not be qualified by an address-space qualifier." 6032 // Since all parameters have automatic store duration, they can not have 6033 // an address space. 6034 if (T.getAddressSpace() != 0) { 6035 Diag(NameLoc, diag::err_arg_with_address_space); 6036 New->setInvalidDecl(); 6037 } 6038 6039 return New; 6040} 6041 6042void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 6043 SourceLocation LocAfterDecls) { 6044 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 6045 6046 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 6047 // for a K&R function. 6048 if (!FTI.hasPrototype) { 6049 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 6050 --i; 6051 if (FTI.ArgInfo[i].Param == 0) { 6052 llvm::SmallString<256> Code; 6053 llvm::raw_svector_ostream(Code) << " int " 6054 << FTI.ArgInfo[i].Ident->getName() 6055 << ";\n"; 6056 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 6057 << FTI.ArgInfo[i].Ident 6058 << FixItHint::CreateInsertion(LocAfterDecls, Code.str()); 6059 6060 // Implicitly declare the argument as type 'int' for lack of a better 6061 // type. 6062 AttributeFactory attrs; 6063 DeclSpec DS(attrs); 6064 const char* PrevSpec; // unused 6065 unsigned DiagID; // unused 6066 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 6067 PrevSpec, DiagID); 6068 Declarator ParamD(DS, Declarator::KNRTypeListContext); 6069 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 6070 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 6071 } 6072 } 6073 } 6074} 6075 6076Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, 6077 Declarator &D) { 6078 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 6079 assert(D.isFunctionDeclarator() && "Not a function declarator!"); 6080 Scope *ParentScope = FnBodyScope->getParent(); 6081 6082 Decl *DP = HandleDeclarator(ParentScope, D, 6083 MultiTemplateParamsArg(*this), 6084 /*IsFunctionDefinition=*/true); 6085 return ActOnStartOfFunctionDef(FnBodyScope, DP); 6086} 6087 6088static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD) { 6089 // Don't warn about invalid declarations. 6090 if (FD->isInvalidDecl()) 6091 return false; 6092 6093 // Or declarations that aren't global. 6094 if (!FD->isGlobal()) 6095 return false; 6096 6097 // Don't warn about C++ member functions. 6098 if (isa<CXXMethodDecl>(FD)) 6099 return false; 6100 6101 // Don't warn about 'main'. 6102 if (FD->isMain()) 6103 return false; 6104 6105 // Don't warn about inline functions. 6106 if (FD->isInlined()) 6107 return false; 6108 6109 // Don't warn about function templates. 6110 if (FD->getDescribedFunctionTemplate()) 6111 return false; 6112 6113 // Don't warn about function template specializations. 6114 if (FD->isFunctionTemplateSpecialization()) 6115 return false; 6116 6117 bool MissingPrototype = true; 6118 for (const FunctionDecl *Prev = FD->getPreviousDeclaration(); 6119 Prev; Prev = Prev->getPreviousDeclaration()) { 6120 // Ignore any declarations that occur in function or method 6121 // scope, because they aren't visible from the header. 6122 if (Prev->getDeclContext()->isFunctionOrMethod()) 6123 continue; 6124 6125 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 6126 break; 6127 } 6128 6129 return MissingPrototype; 6130} 6131 6132void Sema::CheckForFunctionRedefinition(FunctionDecl *FD) { 6133 // Don't complain if we're in GNU89 mode and the previous definition 6134 // was an extern inline function. 6135 const FunctionDecl *Definition; 6136 if (FD->isDefined(Definition) && 6137 !canRedefineFunction(Definition, getLangOptions())) { 6138 if (getLangOptions().GNUMode && Definition->isInlineSpecified() && 6139 Definition->getStorageClass() == SC_Extern) 6140 Diag(FD->getLocation(), diag::err_redefinition_extern_inline) 6141 << FD->getDeclName() << getLangOptions().CPlusPlus; 6142 else 6143 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 6144 Diag(Definition->getLocation(), diag::note_previous_definition); 6145 } 6146} 6147 6148Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Decl *D) { 6149 // Clear the last template instantiation error context. 6150 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation(); 6151 6152 if (!D) 6153 return D; 6154 FunctionDecl *FD = 0; 6155 6156 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(D)) 6157 FD = FunTmpl->getTemplatedDecl(); 6158 else 6159 FD = cast<FunctionDecl>(D); 6160 6161 // Enter a new function scope 6162 PushFunctionScope(); 6163 6164 // See if this is a redefinition. 6165 if (!FD->isLateTemplateParsed()) 6166 CheckForFunctionRedefinition(FD); 6167 6168 // Builtin functions cannot be defined. 6169 if (unsigned BuiltinID = FD->getBuiltinID()) { 6170 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 6171 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 6172 FD->setInvalidDecl(); 6173 } 6174 } 6175 6176 // The return type of a function definition must be complete 6177 // (C99 6.9.1p3, C++ [dcl.fct]p6). 6178 QualType ResultType = FD->getResultType(); 6179 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 6180 !FD->isInvalidDecl() && 6181 RequireCompleteType(FD->getLocation(), ResultType, 6182 diag::err_func_def_incomplete_result)) 6183 FD->setInvalidDecl(); 6184 6185 // GNU warning -Wmissing-prototypes: 6186 // Warn if a global function is defined without a previous 6187 // prototype declaration. This warning is issued even if the 6188 // definition itself provides a prototype. The aim is to detect 6189 // global functions that fail to be declared in header files. 6190 if (ShouldWarnAboutMissingPrototype(FD)) 6191 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 6192 6193 if (FnBodyScope) 6194 PushDeclContext(FnBodyScope, FD); 6195 6196 // Check the validity of our function parameters 6197 CheckParmsForFunctionDef(FD->param_begin(), FD->param_end(), 6198 /*CheckParameterNames=*/true); 6199 6200 // Introduce our parameters into the function scope 6201 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 6202 ParmVarDecl *Param = FD->getParamDecl(p); 6203 Param->setOwningFunction(FD); 6204 6205 // If this has an identifier, add it to the scope stack. 6206 if (Param->getIdentifier() && FnBodyScope) { 6207 CheckShadow(FnBodyScope, Param); 6208 6209 PushOnScopeChains(Param, FnBodyScope); 6210 } 6211 } 6212 6213 // Checking attributes of current function definition 6214 // dllimport attribute. 6215 DLLImportAttr *DA = FD->getAttr<DLLImportAttr>(); 6216 if (DA && (!FD->getAttr<DLLExportAttr>())) { 6217 // dllimport attribute cannot be directly applied to definition. 6218 // Microsoft accepts dllimport for functions defined within class scope. 6219 if (!DA->isInherited() && 6220 !(LangOpts.Microsoft && FD->getLexicalDeclContext()->isRecord())) { 6221 Diag(FD->getLocation(), 6222 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 6223 << "dllimport"; 6224 FD->setInvalidDecl(); 6225 return FD; 6226 } 6227 6228 // Visual C++ appears to not think this is an issue, so only issue 6229 // a warning when Microsoft extensions are disabled. 6230 if (!LangOpts.Microsoft) { 6231 // If a symbol previously declared dllimport is later defined, the 6232 // attribute is ignored in subsequent references, and a warning is 6233 // emitted. 6234 Diag(FD->getLocation(), 6235 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 6236 << FD->getName() << "dllimport"; 6237 } 6238 } 6239 return FD; 6240} 6241 6242/// \brief Given the set of return statements within a function body, 6243/// compute the variables that are subject to the named return value 6244/// optimization. 6245/// 6246/// Each of the variables that is subject to the named return value 6247/// optimization will be marked as NRVO variables in the AST, and any 6248/// return statement that has a marked NRVO variable as its NRVO candidate can 6249/// use the named return value optimization. 6250/// 6251/// This function applies a very simplistic algorithm for NRVO: if every return 6252/// statement in the function has the same NRVO candidate, that candidate is 6253/// the NRVO variable. 6254/// 6255/// FIXME: Employ a smarter algorithm that accounts for multiple return 6256/// statements and the lifetimes of the NRVO candidates. We should be able to 6257/// find a maximal set of NRVO variables. 6258static void ComputeNRVO(Stmt *Body, FunctionScopeInfo *Scope) { 6259 ReturnStmt **Returns = Scope->Returns.data(); 6260 6261 const VarDecl *NRVOCandidate = 0; 6262 for (unsigned I = 0, E = Scope->Returns.size(); I != E; ++I) { 6263 if (!Returns[I]->getNRVOCandidate()) 6264 return; 6265 6266 if (!NRVOCandidate) 6267 NRVOCandidate = Returns[I]->getNRVOCandidate(); 6268 else if (NRVOCandidate != Returns[I]->getNRVOCandidate()) 6269 return; 6270 } 6271 6272 if (NRVOCandidate) 6273 const_cast<VarDecl*>(NRVOCandidate)->setNRVOVariable(true); 6274} 6275 6276Decl *Sema::ActOnFinishFunctionBody(Decl *D, Stmt *BodyArg) { 6277 return ActOnFinishFunctionBody(D, move(BodyArg), false); 6278} 6279 6280Decl *Sema::ActOnFinishFunctionBody(Decl *dcl, Stmt *Body, 6281 bool IsInstantiation) { 6282 FunctionDecl *FD = 0; 6283 FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl); 6284 if (FunTmpl) 6285 FD = FunTmpl->getTemplatedDecl(); 6286 else 6287 FD = dyn_cast_or_null<FunctionDecl>(dcl); 6288 6289 sema::AnalysisBasedWarnings::Policy WP = AnalysisWarnings.getDefaultPolicy(); 6290 sema::AnalysisBasedWarnings::Policy *ActivePolicy = 0; 6291 6292 if (FD) { 6293 FD->setBody(Body); 6294 if (FD->isMain()) { 6295 // C and C++ allow for main to automagically return 0. 6296 // Implements C++ [basic.start.main]p5 and C99 5.1.2.2.3. 6297 FD->setHasImplicitReturnZero(true); 6298 WP.disableCheckFallThrough(); 6299 } 6300 6301 // MSVC permits the use of pure specifier (=0) on function definition, 6302 // defined at class scope, warn about this non standard construct. 6303 if (getLangOptions().Microsoft && FD->isPure()) 6304 Diag(FD->getLocation(), diag::warn_pure_function_definition); 6305 6306 if (!FD->isInvalidDecl()) { 6307 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end()); 6308 DiagnoseSizeOfParametersAndReturnValue(FD->param_begin(), FD->param_end(), 6309 FD->getResultType(), FD); 6310 6311 // If this is a constructor, we need a vtable. 6312 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(FD)) 6313 MarkVTableUsed(FD->getLocation(), Constructor->getParent()); 6314 6315 ComputeNRVO(Body, getCurFunction()); 6316 } 6317 6318 assert(FD == getCurFunctionDecl() && "Function parsing confused"); 6319 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 6320 assert(MD == getCurMethodDecl() && "Method parsing confused"); 6321 MD->setBody(Body); 6322 if (Body) 6323 MD->setEndLoc(Body->getLocEnd()); 6324 if (!MD->isInvalidDecl()) { 6325 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end()); 6326 DiagnoseSizeOfParametersAndReturnValue(MD->param_begin(), MD->param_end(), 6327 MD->getResultType(), MD); 6328 } 6329 } else { 6330 return 0; 6331 } 6332 6333 // Verify and clean out per-function state. 6334 if (Body) { 6335 // C++ constructors that have function-try-blocks can't have return 6336 // statements in the handlers of that block. (C++ [except.handle]p14) 6337 // Verify this. 6338 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body)) 6339 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); 6340 6341 // Verify that that gotos and switch cases don't jump into scopes illegally. 6342 // Verify that that gotos and switch cases don't jump into scopes illegally. 6343 if (getCurFunction()->NeedsScopeChecking() && 6344 !dcl->isInvalidDecl() && 6345 !hasAnyErrorsInThisFunction()) 6346 DiagnoseInvalidJumps(Body); 6347 6348 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) { 6349 if (!Destructor->getParent()->isDependentType()) 6350 CheckDestructor(Destructor); 6351 6352 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 6353 Destructor->getParent()); 6354 } 6355 6356 // If any errors have occurred, clear out any temporaries that may have 6357 // been leftover. This ensures that these temporaries won't be picked up for 6358 // deletion in some later function. 6359 if (PP.getDiagnostics().hasErrorOccurred() || 6360 PP.getDiagnostics().getSuppressAllDiagnostics()) 6361 ExprTemporaries.clear(); 6362 else if (!isa<FunctionTemplateDecl>(dcl)) { 6363 // Since the body is valid, issue any analysis-based warnings that are 6364 // enabled. 6365 ActivePolicy = &WP; 6366 } 6367 6368 assert(ExprTemporaries.empty() && "Leftover temporaries in function"); 6369 } 6370 6371 if (!IsInstantiation) 6372 PopDeclContext(); 6373 6374 PopFunctionOrBlockScope(ActivePolicy, dcl); 6375 6376 // If any errors have occurred, clear out any temporaries that may have 6377 // been leftover. This ensures that these temporaries won't be picked up for 6378 // deletion in some later function. 6379 if (getDiagnostics().hasErrorOccurred()) 6380 ExprTemporaries.clear(); 6381 6382 return dcl; 6383} 6384 6385/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 6386/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 6387NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 6388 IdentifierInfo &II, Scope *S) { 6389 // Before we produce a declaration for an implicitly defined 6390 // function, see whether there was a locally-scoped declaration of 6391 // this name as a function or variable. If so, use that 6392 // (non-visible) declaration, and complain about it. 6393 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 6394 = LocallyScopedExternalDecls.find(&II); 6395 if (Pos != LocallyScopedExternalDecls.end()) { 6396 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 6397 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 6398 return Pos->second; 6399 } 6400 6401 // Extension in C99. Legal in C90, but warn about it. 6402 if (II.getName().startswith("__builtin_")) 6403 Diag(Loc, diag::warn_builtin_unknown) << &II; 6404 else if (getLangOptions().C99) 6405 Diag(Loc, diag::ext_implicit_function_decl) << &II; 6406 else 6407 Diag(Loc, diag::warn_implicit_function_decl) << &II; 6408 6409 // Set a Declarator for the implicit definition: int foo(); 6410 const char *Dummy; 6411 AttributeFactory attrFactory; 6412 DeclSpec DS(attrFactory); 6413 unsigned DiagID; 6414 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID); 6415 (void)Error; // Silence warning. 6416 assert(!Error && "Error setting up implicit decl!"); 6417 Declarator D(DS, Declarator::BlockContext); 6418 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0, 6419 0, 0, true, SourceLocation(), 6420 EST_None, SourceLocation(), 6421 0, 0, 0, 0, Loc, Loc, D), 6422 DS.getAttributes(), 6423 SourceLocation()); 6424 D.SetIdentifier(&II, Loc); 6425 6426 // Insert this function into translation-unit scope. 6427 6428 DeclContext *PrevDC = CurContext; 6429 CurContext = Context.getTranslationUnitDecl(); 6430 6431 FunctionDecl *FD = dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D)); 6432 FD->setImplicit(); 6433 6434 CurContext = PrevDC; 6435 6436 AddKnownFunctionAttributes(FD); 6437 6438 return FD; 6439} 6440 6441/// \brief Adds any function attributes that we know a priori based on 6442/// the declaration of this function. 6443/// 6444/// These attributes can apply both to implicitly-declared builtins 6445/// (like __builtin___printf_chk) or to library-declared functions 6446/// like NSLog or printf. 6447void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 6448 if (FD->isInvalidDecl()) 6449 return; 6450 6451 // If this is a built-in function, map its builtin attributes to 6452 // actual attributes. 6453 if (unsigned BuiltinID = FD->getBuiltinID()) { 6454 // Handle printf-formatting attributes. 6455 unsigned FormatIdx; 6456 bool HasVAListArg; 6457 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 6458 if (!FD->getAttr<FormatAttr>()) 6459 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 6460 "printf", FormatIdx+1, 6461 HasVAListArg ? 0 : FormatIdx+2)); 6462 } 6463 if (Context.BuiltinInfo.isScanfLike(BuiltinID, FormatIdx, 6464 HasVAListArg)) { 6465 if (!FD->getAttr<FormatAttr>()) 6466 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 6467 "scanf", FormatIdx+1, 6468 HasVAListArg ? 0 : FormatIdx+2)); 6469 } 6470 6471 // Mark const if we don't care about errno and that is the only 6472 // thing preventing the function from being const. This allows 6473 // IRgen to use LLVM intrinsics for such functions. 6474 if (!getLangOptions().MathErrno && 6475 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 6476 if (!FD->getAttr<ConstAttr>()) 6477 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 6478 } 6479 6480 if (Context.BuiltinInfo.isNoThrow(BuiltinID)) 6481 FD->addAttr(::new (Context) NoThrowAttr(FD->getLocation(), Context)); 6482 if (Context.BuiltinInfo.isConst(BuiltinID)) 6483 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 6484 } 6485 6486 IdentifierInfo *Name = FD->getIdentifier(); 6487 if (!Name) 6488 return; 6489 if ((!getLangOptions().CPlusPlus && 6490 FD->getDeclContext()->isTranslationUnit()) || 6491 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 6492 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 6493 LinkageSpecDecl::lang_c)) { 6494 // Okay: this could be a libc/libm/Objective-C function we know 6495 // about. 6496 } else 6497 return; 6498 6499 if (Name->isStr("NSLog") || Name->isStr("NSLogv")) { 6500 // FIXME: NSLog and NSLogv should be target specific 6501 if (const FormatAttr *Format = FD->getAttr<FormatAttr>()) { 6502 // FIXME: We known better than our headers. 6503 const_cast<FormatAttr *>(Format)->setType(Context, "printf"); 6504 } else 6505 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 6506 "printf", 1, 6507 Name->isStr("NSLogv") ? 0 : 2)); 6508 } else if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { 6509 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be 6510 // target-specific builtins, perhaps? 6511 if (!FD->getAttr<FormatAttr>()) 6512 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 6513 "printf", 2, 6514 Name->isStr("vasprintf") ? 0 : 3)); 6515 } 6516} 6517 6518TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 6519 TypeSourceInfo *TInfo) { 6520 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 6521 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 6522 6523 if (!TInfo) { 6524 assert(D.isInvalidType() && "no declarator info for valid type"); 6525 TInfo = Context.getTrivialTypeSourceInfo(T); 6526 } 6527 6528 // Scope manipulation handled by caller. 6529 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 6530 D.getSourceRange().getBegin(), 6531 D.getIdentifierLoc(), 6532 D.getIdentifier(), 6533 TInfo); 6534 6535 // Bail out immediately if we have an invalid declaration. 6536 if (D.isInvalidType()) { 6537 NewTD->setInvalidDecl(); 6538 return NewTD; 6539 } 6540 6541 // C++ [dcl.typedef]p8: 6542 // If the typedef declaration defines an unnamed class (or 6543 // enum), the first typedef-name declared by the declaration 6544 // to be that class type (or enum type) is used to denote the 6545 // class type (or enum type) for linkage purposes only. 6546 // We need to check whether the type was declared in the declaration. 6547 switch (D.getDeclSpec().getTypeSpecType()) { 6548 case TST_enum: 6549 case TST_struct: 6550 case TST_union: 6551 case TST_class: { 6552 TagDecl *tagFromDeclSpec = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 6553 6554 // Do nothing if the tag is not anonymous or already has an 6555 // associated typedef (from an earlier typedef in this decl group). 6556 if (tagFromDeclSpec->getIdentifier()) break; 6557 if (tagFromDeclSpec->getTypedefNameForAnonDecl()) break; 6558 6559 // A well-formed anonymous tag must always be a TUK_Definition. 6560 assert(tagFromDeclSpec->isThisDeclarationADefinition()); 6561 6562 // The type must match the tag exactly; no qualifiers allowed. 6563 if (!Context.hasSameType(T, Context.getTagDeclType(tagFromDeclSpec))) 6564 break; 6565 6566 // Otherwise, set this is the anon-decl typedef for the tag. 6567 tagFromDeclSpec->setTypedefNameForAnonDecl(NewTD); 6568 break; 6569 } 6570 6571 default: 6572 break; 6573 } 6574 6575 return NewTD; 6576} 6577 6578 6579/// \brief Determine whether a tag with a given kind is acceptable 6580/// as a redeclaration of the given tag declaration. 6581/// 6582/// \returns true if the new tag kind is acceptable, false otherwise. 6583bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, 6584 TagTypeKind NewTag, 6585 SourceLocation NewTagLoc, 6586 const IdentifierInfo &Name) { 6587 // C++ [dcl.type.elab]p3: 6588 // The class-key or enum keyword present in the 6589 // elaborated-type-specifier shall agree in kind with the 6590 // declaration to which the name in the elaborated-type-specifier 6591 // refers. This rule also applies to the form of 6592 // elaborated-type-specifier that declares a class-name or 6593 // friend class since it can be construed as referring to the 6594 // definition of the class. Thus, in any 6595 // elaborated-type-specifier, the enum keyword shall be used to 6596 // refer to an enumeration (7.2), the union class-key shall be 6597 // used to refer to a union (clause 9), and either the class or 6598 // struct class-key shall be used to refer to a class (clause 9) 6599 // declared using the class or struct class-key. 6600 TagTypeKind OldTag = Previous->getTagKind(); 6601 if (OldTag == NewTag) 6602 return true; 6603 6604 if ((OldTag == TTK_Struct || OldTag == TTK_Class) && 6605 (NewTag == TTK_Struct || NewTag == TTK_Class)) { 6606 // Warn about the struct/class tag mismatch. 6607 bool isTemplate = false; 6608 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) 6609 isTemplate = Record->getDescribedClassTemplate(); 6610 6611 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 6612 << (NewTag == TTK_Class) 6613 << isTemplate << &Name 6614 << FixItHint::CreateReplacement(SourceRange(NewTagLoc), 6615 OldTag == TTK_Class? "class" : "struct"); 6616 Diag(Previous->getLocation(), diag::note_previous_use); 6617 return true; 6618 } 6619 return false; 6620} 6621 6622/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 6623/// former case, Name will be non-null. In the later case, Name will be null. 6624/// TagSpec indicates what kind of tag this is. TUK indicates whether this is a 6625/// reference/declaration/definition of a tag. 6626Decl *Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK, 6627 SourceLocation KWLoc, CXXScopeSpec &SS, 6628 IdentifierInfo *Name, SourceLocation NameLoc, 6629 AttributeList *Attr, AccessSpecifier AS, 6630 MultiTemplateParamsArg TemplateParameterLists, 6631 bool &OwnedDecl, bool &IsDependent, 6632 bool ScopedEnum, bool ScopedEnumUsesClassTag, 6633 TypeResult UnderlyingType) { 6634 // If this is not a definition, it must have a name. 6635 assert((Name != 0 || TUK == TUK_Definition) && 6636 "Nameless record must be a definition!"); 6637 assert(TemplateParameterLists.size() == 0 || TUK != TUK_Reference); 6638 6639 OwnedDecl = false; 6640 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 6641 6642 // FIXME: Check explicit specializations more carefully. 6643 bool isExplicitSpecialization = false; 6644 bool Invalid = false; 6645 6646 // We only need to do this matching if we have template parameters 6647 // or a scope specifier, which also conveniently avoids this work 6648 // for non-C++ cases. 6649 if (TemplateParameterLists.size() > 0 || 6650 (SS.isNotEmpty() && TUK != TUK_Reference)) { 6651 if (TemplateParameterList *TemplateParams 6652 = MatchTemplateParametersToScopeSpecifier(KWLoc, NameLoc, SS, 6653 TemplateParameterLists.get(), 6654 TemplateParameterLists.size(), 6655 TUK == TUK_Friend, 6656 isExplicitSpecialization, 6657 Invalid)) { 6658 if (TemplateParams->size() > 0) { 6659 // This is a declaration or definition of a class template (which may 6660 // be a member of another template). 6661 6662 if (Invalid) 6663 return 0; 6664 6665 OwnedDecl = false; 6666 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc, 6667 SS, Name, NameLoc, Attr, 6668 TemplateParams, AS, 6669 TemplateParameterLists.size() - 1, 6670 (TemplateParameterList**) TemplateParameterLists.release()); 6671 return Result.get(); 6672 } else { 6673 // The "template<>" header is extraneous. 6674 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 6675 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 6676 isExplicitSpecialization = true; 6677 } 6678 } 6679 } 6680 6681 // Figure out the underlying type if this a enum declaration. We need to do 6682 // this early, because it's needed to detect if this is an incompatible 6683 // redeclaration. 6684 llvm::PointerUnion<const Type*, TypeSourceInfo*> EnumUnderlying; 6685 6686 if (Kind == TTK_Enum) { 6687 if (UnderlyingType.isInvalid() || (!UnderlyingType.get() && ScopedEnum)) 6688 // No underlying type explicitly specified, or we failed to parse the 6689 // type, default to int. 6690 EnumUnderlying = Context.IntTy.getTypePtr(); 6691 else if (UnderlyingType.get()) { 6692 // C++0x 7.2p2: The type-specifier-seq of an enum-base shall name an 6693 // integral type; any cv-qualification is ignored. 6694 TypeSourceInfo *TI = 0; 6695 QualType T = GetTypeFromParser(UnderlyingType.get(), &TI); 6696 EnumUnderlying = TI; 6697 6698 SourceLocation UnderlyingLoc = TI->getTypeLoc().getBeginLoc(); 6699 6700 if (!T->isDependentType() && !T->isIntegralType(Context)) { 6701 Diag(UnderlyingLoc, diag::err_enum_invalid_underlying) 6702 << T; 6703 // Recover by falling back to int. 6704 EnumUnderlying = Context.IntTy.getTypePtr(); 6705 } 6706 6707 if (DiagnoseUnexpandedParameterPack(UnderlyingLoc, TI, 6708 UPPC_FixedUnderlyingType)) 6709 EnumUnderlying = Context.IntTy.getTypePtr(); 6710 6711 } else if (getLangOptions().Microsoft) 6712 // Microsoft enums are always of int type. 6713 EnumUnderlying = Context.IntTy.getTypePtr(); 6714 } 6715 6716 DeclContext *SearchDC = CurContext; 6717 DeclContext *DC = CurContext; 6718 bool isStdBadAlloc = false; 6719 6720 RedeclarationKind Redecl = ForRedeclaration; 6721 if (TUK == TUK_Friend || TUK == TUK_Reference) 6722 Redecl = NotForRedeclaration; 6723 6724 LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl); 6725 6726 if (Name && SS.isNotEmpty()) { 6727 // We have a nested-name tag ('struct foo::bar'). 6728 6729 // Check for invalid 'foo::'. 6730 if (SS.isInvalid()) { 6731 Name = 0; 6732 goto CreateNewDecl; 6733 } 6734 6735 // If this is a friend or a reference to a class in a dependent 6736 // context, don't try to make a decl for it. 6737 if (TUK == TUK_Friend || TUK == TUK_Reference) { 6738 DC = computeDeclContext(SS, false); 6739 if (!DC) { 6740 IsDependent = true; 6741 return 0; 6742 } 6743 } else { 6744 DC = computeDeclContext(SS, true); 6745 if (!DC) { 6746 Diag(SS.getRange().getBegin(), diag::err_dependent_nested_name_spec) 6747 << SS.getRange(); 6748 return 0; 6749 } 6750 } 6751 6752 if (RequireCompleteDeclContext(SS, DC)) 6753 return 0; 6754 6755 SearchDC = DC; 6756 // Look-up name inside 'foo::'. 6757 LookupQualifiedName(Previous, DC); 6758 6759 if (Previous.isAmbiguous()) 6760 return 0; 6761 6762 if (Previous.empty()) { 6763 // Name lookup did not find anything. However, if the 6764 // nested-name-specifier refers to the current instantiation, 6765 // and that current instantiation has any dependent base 6766 // classes, we might find something at instantiation time: treat 6767 // this as a dependent elaborated-type-specifier. 6768 // But this only makes any sense for reference-like lookups. 6769 if (Previous.wasNotFoundInCurrentInstantiation() && 6770 (TUK == TUK_Reference || TUK == TUK_Friend)) { 6771 IsDependent = true; 6772 return 0; 6773 } 6774 6775 // A tag 'foo::bar' must already exist. 6776 Diag(NameLoc, diag::err_not_tag_in_scope) 6777 << Kind << Name << DC << SS.getRange(); 6778 Name = 0; 6779 Invalid = true; 6780 goto CreateNewDecl; 6781 } 6782 } else if (Name) { 6783 // If this is a named struct, check to see if there was a previous forward 6784 // declaration or definition. 6785 // FIXME: We're looking into outer scopes here, even when we 6786 // shouldn't be. Doing so can result in ambiguities that we 6787 // shouldn't be diagnosing. 6788 LookupName(Previous, S); 6789 6790 if (Previous.isAmbiguous() && 6791 (TUK == TUK_Definition || TUK == TUK_Declaration)) { 6792 LookupResult::Filter F = Previous.makeFilter(); 6793 while (F.hasNext()) { 6794 NamedDecl *ND = F.next(); 6795 if (ND->getDeclContext()->getRedeclContext() != SearchDC) 6796 F.erase(); 6797 } 6798 F.done(); 6799 } 6800 6801 // Note: there used to be some attempt at recovery here. 6802 if (Previous.isAmbiguous()) 6803 return 0; 6804 6805 if (!getLangOptions().CPlusPlus && TUK != TUK_Reference) { 6806 // FIXME: This makes sure that we ignore the contexts associated 6807 // with C structs, unions, and enums when looking for a matching 6808 // tag declaration or definition. See the similar lookup tweak 6809 // in Sema::LookupName; is there a better way to deal with this? 6810 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 6811 SearchDC = SearchDC->getParent(); 6812 } 6813 } else if (S->isFunctionPrototypeScope()) { 6814 // If this is an enum declaration in function prototype scope, set its 6815 // initial context to the translation unit. 6816 SearchDC = Context.getTranslationUnitDecl(); 6817 } 6818 6819 if (Previous.isSingleResult() && 6820 Previous.getFoundDecl()->isTemplateParameter()) { 6821 // Maybe we will complain about the shadowed template parameter. 6822 DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl()); 6823 // Just pretend that we didn't see the previous declaration. 6824 Previous.clear(); 6825 } 6826 6827 if (getLangOptions().CPlusPlus && Name && DC && StdNamespace && 6828 DC->Equals(getStdNamespace()) && Name->isStr("bad_alloc")) { 6829 // This is a declaration of or a reference to "std::bad_alloc". 6830 isStdBadAlloc = true; 6831 6832 if (Previous.empty() && StdBadAlloc) { 6833 // std::bad_alloc has been implicitly declared (but made invisible to 6834 // name lookup). Fill in this implicit declaration as the previous 6835 // declaration, so that the declarations get chained appropriately. 6836 Previous.addDecl(getStdBadAlloc()); 6837 } 6838 } 6839 6840 // If we didn't find a previous declaration, and this is a reference 6841 // (or friend reference), move to the correct scope. In C++, we 6842 // also need to do a redeclaration lookup there, just in case 6843 // there's a shadow friend decl. 6844 if (Name && Previous.empty() && 6845 (TUK == TUK_Reference || TUK == TUK_Friend)) { 6846 if (Invalid) goto CreateNewDecl; 6847 assert(SS.isEmpty()); 6848 6849 if (TUK == TUK_Reference) { 6850 // C++ [basic.scope.pdecl]p5: 6851 // -- for an elaborated-type-specifier of the form 6852 // 6853 // class-key identifier 6854 // 6855 // if the elaborated-type-specifier is used in the 6856 // decl-specifier-seq or parameter-declaration-clause of a 6857 // function defined in namespace scope, the identifier is 6858 // declared as a class-name in the namespace that contains 6859 // the declaration; otherwise, except as a friend 6860 // declaration, the identifier is declared in the smallest 6861 // non-class, non-function-prototype scope that contains the 6862 // declaration. 6863 // 6864 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 6865 // C structs and unions. 6866 // 6867 // It is an error in C++ to declare (rather than define) an enum 6868 // type, including via an elaborated type specifier. We'll 6869 // diagnose that later; for now, declare the enum in the same 6870 // scope as we would have picked for any other tag type. 6871 // 6872 // GNU C also supports this behavior as part of its incomplete 6873 // enum types extension, while GNU C++ does not. 6874 // 6875 // Find the context where we'll be declaring the tag. 6876 // FIXME: We would like to maintain the current DeclContext as the 6877 // lexical context, 6878 while (SearchDC->isRecord() || SearchDC->isTransparentContext()) 6879 SearchDC = SearchDC->getParent(); 6880 6881 // Find the scope where we'll be declaring the tag. 6882 while (S->isClassScope() || 6883 (getLangOptions().CPlusPlus && 6884 S->isFunctionPrototypeScope()) || 6885 ((S->getFlags() & Scope::DeclScope) == 0) || 6886 (S->getEntity() && 6887 ((DeclContext *)S->getEntity())->isTransparentContext())) 6888 S = S->getParent(); 6889 } else { 6890 assert(TUK == TUK_Friend); 6891 // C++ [namespace.memdef]p3: 6892 // If a friend declaration in a non-local class first declares a 6893 // class or function, the friend class or function is a member of 6894 // the innermost enclosing namespace. 6895 SearchDC = SearchDC->getEnclosingNamespaceContext(); 6896 } 6897 6898 // In C++, we need to do a redeclaration lookup to properly 6899 // diagnose some problems. 6900 if (getLangOptions().CPlusPlus) { 6901 Previous.setRedeclarationKind(ForRedeclaration); 6902 LookupQualifiedName(Previous, SearchDC); 6903 } 6904 } 6905 6906 if (!Previous.empty()) { 6907 NamedDecl *PrevDecl = (*Previous.begin())->getUnderlyingDecl(); 6908 6909 // It's okay to have a tag decl in the same scope as a typedef 6910 // which hides a tag decl in the same scope. Finding this 6911 // insanity with a redeclaration lookup can only actually happen 6912 // in C++. 6913 // 6914 // This is also okay for elaborated-type-specifiers, which is 6915 // technically forbidden by the current standard but which is 6916 // okay according to the likely resolution of an open issue; 6917 // see http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#407 6918 if (getLangOptions().CPlusPlus) { 6919 if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(PrevDecl)) { 6920 if (const TagType *TT = TD->getUnderlyingType()->getAs<TagType>()) { 6921 TagDecl *Tag = TT->getDecl(); 6922 if (Tag->getDeclName() == Name && 6923 Tag->getDeclContext()->getRedeclContext() 6924 ->Equals(TD->getDeclContext()->getRedeclContext())) { 6925 PrevDecl = Tag; 6926 Previous.clear(); 6927 Previous.addDecl(Tag); 6928 Previous.resolveKind(); 6929 } 6930 } 6931 } 6932 } 6933 6934 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 6935 // If this is a use of a previous tag, or if the tag is already declared 6936 // in the same scope (so that the definition/declaration completes or 6937 // rementions the tag), reuse the decl. 6938 if (TUK == TUK_Reference || TUK == TUK_Friend || 6939 isDeclInScope(PrevDecl, SearchDC, S, isExplicitSpecialization)) { 6940 // Make sure that this wasn't declared as an enum and now used as a 6941 // struct or something similar. 6942 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, KWLoc, *Name)) { 6943 bool SafeToContinue 6944 = (PrevTagDecl->getTagKind() != TTK_Enum && 6945 Kind != TTK_Enum); 6946 if (SafeToContinue) 6947 Diag(KWLoc, diag::err_use_with_wrong_tag) 6948 << Name 6949 << FixItHint::CreateReplacement(SourceRange(KWLoc), 6950 PrevTagDecl->getKindName()); 6951 else 6952 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 6953 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 6954 6955 if (SafeToContinue) 6956 Kind = PrevTagDecl->getTagKind(); 6957 else { 6958 // Recover by making this an anonymous redefinition. 6959 Name = 0; 6960 Previous.clear(); 6961 Invalid = true; 6962 } 6963 } 6964 6965 if (Kind == TTK_Enum && PrevTagDecl->getTagKind() == TTK_Enum) { 6966 const EnumDecl *PrevEnum = cast<EnumDecl>(PrevTagDecl); 6967 6968 // All conflicts with previous declarations are recovered by 6969 // returning the previous declaration. 6970 if (ScopedEnum != PrevEnum->isScoped()) { 6971 Diag(KWLoc, diag::err_enum_redeclare_scoped_mismatch) 6972 << PrevEnum->isScoped(); 6973 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 6974 return PrevTagDecl; 6975 } 6976 else if (EnumUnderlying && PrevEnum->isFixed()) { 6977 QualType T; 6978 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 6979 T = TI->getType(); 6980 else 6981 T = QualType(EnumUnderlying.get<const Type*>(), 0); 6982 6983 if (!Context.hasSameUnqualifiedType(T, PrevEnum->getIntegerType())) { 6984 Diag(NameLoc.isValid() ? NameLoc : KWLoc, 6985 diag::err_enum_redeclare_type_mismatch) 6986 << T 6987 << PrevEnum->getIntegerType(); 6988 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 6989 return PrevTagDecl; 6990 } 6991 } 6992 else if (!EnumUnderlying.isNull() != PrevEnum->isFixed()) { 6993 Diag(KWLoc, diag::err_enum_redeclare_fixed_mismatch) 6994 << PrevEnum->isFixed(); 6995 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 6996 return PrevTagDecl; 6997 } 6998 } 6999 7000 if (!Invalid) { 7001 // If this is a use, just return the declaration we found. 7002 7003 // FIXME: In the future, return a variant or some other clue 7004 // for the consumer of this Decl to know it doesn't own it. 7005 // For our current ASTs this shouldn't be a problem, but will 7006 // need to be changed with DeclGroups. 7007 if ((TUK == TUK_Reference && !PrevTagDecl->getFriendObjectKind()) || 7008 TUK == TUK_Friend) 7009 return PrevTagDecl; 7010 7011 // Diagnose attempts to redefine a tag. 7012 if (TUK == TUK_Definition) { 7013 if (TagDecl *Def = PrevTagDecl->getDefinition()) { 7014 // If we're defining a specialization and the previous definition 7015 // is from an implicit instantiation, don't emit an error 7016 // here; we'll catch this in the general case below. 7017 if (!isExplicitSpecialization || 7018 !isa<CXXRecordDecl>(Def) || 7019 cast<CXXRecordDecl>(Def)->getTemplateSpecializationKind() 7020 == TSK_ExplicitSpecialization) { 7021 Diag(NameLoc, diag::err_redefinition) << Name; 7022 Diag(Def->getLocation(), diag::note_previous_definition); 7023 // If this is a redefinition, recover by making this 7024 // struct be anonymous, which will make any later 7025 // references get the previous definition. 7026 Name = 0; 7027 Previous.clear(); 7028 Invalid = true; 7029 } 7030 } else { 7031 // If the type is currently being defined, complain 7032 // about a nested redefinition. 7033 const TagType *Tag 7034 = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 7035 if (Tag->isBeingDefined()) { 7036 Diag(NameLoc, diag::err_nested_redefinition) << Name; 7037 Diag(PrevTagDecl->getLocation(), 7038 diag::note_previous_definition); 7039 Name = 0; 7040 Previous.clear(); 7041 Invalid = true; 7042 } 7043 } 7044 7045 // Okay, this is definition of a previously declared or referenced 7046 // tag PrevDecl. We're going to create a new Decl for it. 7047 } 7048 } 7049 // If we get here we have (another) forward declaration or we 7050 // have a definition. Just create a new decl. 7051 7052 } else { 7053 // If we get here, this is a definition of a new tag type in a nested 7054 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 7055 // new decl/type. We set PrevDecl to NULL so that the entities 7056 // have distinct types. 7057 Previous.clear(); 7058 } 7059 // If we get here, we're going to create a new Decl. If PrevDecl 7060 // is non-NULL, it's a definition of the tag declared by 7061 // PrevDecl. If it's NULL, we have a new definition. 7062 7063 7064 // Otherwise, PrevDecl is not a tag, but was found with tag 7065 // lookup. This is only actually possible in C++, where a few 7066 // things like templates still live in the tag namespace. 7067 } else { 7068 assert(getLangOptions().CPlusPlus); 7069 7070 // Use a better diagnostic if an elaborated-type-specifier 7071 // found the wrong kind of type on the first 7072 // (non-redeclaration) lookup. 7073 if ((TUK == TUK_Reference || TUK == TUK_Friend) && 7074 !Previous.isForRedeclaration()) { 7075 unsigned Kind = 0; 7076 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 7077 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 7078 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 7079 Diag(NameLoc, diag::err_tag_reference_non_tag) << Kind; 7080 Diag(PrevDecl->getLocation(), diag::note_declared_at); 7081 Invalid = true; 7082 7083 // Otherwise, only diagnose if the declaration is in scope. 7084 } else if (!isDeclInScope(PrevDecl, SearchDC, S, 7085 isExplicitSpecialization)) { 7086 // do nothing 7087 7088 // Diagnose implicit declarations introduced by elaborated types. 7089 } else if (TUK == TUK_Reference || TUK == TUK_Friend) { 7090 unsigned Kind = 0; 7091 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 7092 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 7093 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 7094 Diag(NameLoc, diag::err_tag_reference_conflict) << Kind; 7095 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 7096 Invalid = true; 7097 7098 // Otherwise it's a declaration. Call out a particularly common 7099 // case here. 7100 } else if (TypedefNameDecl *TND = dyn_cast<TypedefNameDecl>(PrevDecl)) { 7101 unsigned Kind = 0; 7102 if (isa<TypeAliasDecl>(PrevDecl)) Kind = 1; 7103 Diag(NameLoc, diag::err_tag_definition_of_typedef) 7104 << Name << Kind << TND->getUnderlyingType(); 7105 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 7106 Invalid = true; 7107 7108 // Otherwise, diagnose. 7109 } else { 7110 // The tag name clashes with something else in the target scope, 7111 // issue an error and recover by making this tag be anonymous. 7112 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 7113 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 7114 Name = 0; 7115 Invalid = true; 7116 } 7117 7118 // The existing declaration isn't relevant to us; we're in a 7119 // new scope, so clear out the previous declaration. 7120 Previous.clear(); 7121 } 7122 } 7123 7124CreateNewDecl: 7125 7126 TagDecl *PrevDecl = 0; 7127 if (Previous.isSingleResult()) 7128 PrevDecl = cast<TagDecl>(Previous.getFoundDecl()); 7129 7130 // If there is an identifier, use the location of the identifier as the 7131 // location of the decl, otherwise use the location of the struct/union 7132 // keyword. 7133 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 7134 7135 // Otherwise, create a new declaration. If there is a previous 7136 // declaration of the same entity, the two will be linked via 7137 // PrevDecl. 7138 TagDecl *New; 7139 7140 bool IsForwardReference = false; 7141 if (Kind == TTK_Enum) { 7142 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 7143 // enum X { A, B, C } D; D should chain to X. 7144 New = EnumDecl::Create(Context, SearchDC, KWLoc, Loc, Name, 7145 cast_or_null<EnumDecl>(PrevDecl), ScopedEnum, 7146 ScopedEnumUsesClassTag, !EnumUnderlying.isNull()); 7147 // If this is an undefined enum, warn. 7148 if (TUK != TUK_Definition && !Invalid) { 7149 TagDecl *Def; 7150 if (getLangOptions().CPlusPlus0x && cast<EnumDecl>(New)->isFixed()) { 7151 // C++0x: 7.2p2: opaque-enum-declaration. 7152 // Conflicts are diagnosed above. Do nothing. 7153 } 7154 else if (PrevDecl && (Def = cast<EnumDecl>(PrevDecl)->getDefinition())) { 7155 Diag(Loc, diag::ext_forward_ref_enum_def) 7156 << New; 7157 Diag(Def->getLocation(), diag::note_previous_definition); 7158 } else { 7159 unsigned DiagID = diag::ext_forward_ref_enum; 7160 if (getLangOptions().Microsoft) 7161 DiagID = diag::ext_ms_forward_ref_enum; 7162 else if (getLangOptions().CPlusPlus) 7163 DiagID = diag::err_forward_ref_enum; 7164 Diag(Loc, DiagID); 7165 7166 // If this is a forward-declared reference to an enumeration, make a 7167 // note of it; we won't actually be introducing the declaration into 7168 // the declaration context. 7169 if (TUK == TUK_Reference) 7170 IsForwardReference = true; 7171 } 7172 } 7173 7174 if (EnumUnderlying) { 7175 EnumDecl *ED = cast<EnumDecl>(New); 7176 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 7177 ED->setIntegerTypeSourceInfo(TI); 7178 else 7179 ED->setIntegerType(QualType(EnumUnderlying.get<const Type*>(), 0)); 7180 ED->setPromotionType(ED->getIntegerType()); 7181 } 7182 7183 } else { 7184 // struct/union/class 7185 7186 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 7187 // struct X { int A; } D; D should chain to X. 7188 if (getLangOptions().CPlusPlus) { 7189 // FIXME: Look for a way to use RecordDecl for simple structs. 7190 New = CXXRecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 7191 cast_or_null<CXXRecordDecl>(PrevDecl)); 7192 7193 if (isStdBadAlloc && (!StdBadAlloc || getStdBadAlloc()->isImplicit())) 7194 StdBadAlloc = cast<CXXRecordDecl>(New); 7195 } else 7196 New = RecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 7197 cast_or_null<RecordDecl>(PrevDecl)); 7198 } 7199 7200 // Maybe add qualifier info. 7201 if (SS.isNotEmpty()) { 7202 if (SS.isSet()) { 7203 New->setQualifierInfo(SS.getWithLocInContext(Context)); 7204 if (TemplateParameterLists.size() > 0) { 7205 New->setTemplateParameterListsInfo(Context, 7206 TemplateParameterLists.size(), 7207 (TemplateParameterList**) TemplateParameterLists.release()); 7208 } 7209 } 7210 else 7211 Invalid = true; 7212 } 7213 7214 if (RecordDecl *RD = dyn_cast<RecordDecl>(New)) { 7215 // Add alignment attributes if necessary; these attributes are checked when 7216 // the ASTContext lays out the structure. 7217 // 7218 // It is important for implementing the correct semantics that this 7219 // happen here (in act on tag decl). The #pragma pack stack is 7220 // maintained as a result of parser callbacks which can occur at 7221 // many points during the parsing of a struct declaration (because 7222 // the #pragma tokens are effectively skipped over during the 7223 // parsing of the struct). 7224 AddAlignmentAttributesForRecord(RD); 7225 7226 AddMsStructLayoutForRecord(RD); 7227 } 7228 7229 // If this is a specialization of a member class (of a class template), 7230 // check the specialization. 7231 if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous)) 7232 Invalid = true; 7233 7234 if (Invalid) 7235 New->setInvalidDecl(); 7236 7237 if (Attr) 7238 ProcessDeclAttributeList(S, New, Attr); 7239 7240 // If we're declaring or defining a tag in function prototype scope 7241 // in C, note that this type can only be used within the function. 7242 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 7243 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 7244 7245 // Set the lexical context. If the tag has a C++ scope specifier, the 7246 // lexical context will be different from the semantic context. 7247 New->setLexicalDeclContext(CurContext); 7248 7249 // Mark this as a friend decl if applicable. 7250 if (TUK == TUK_Friend) 7251 New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ !Previous.empty()); 7252 7253 // Set the access specifier. 7254 if (!Invalid && SearchDC->isRecord()) 7255 SetMemberAccessSpecifier(New, PrevDecl, AS); 7256 7257 if (TUK == TUK_Definition) 7258 New->startDefinition(); 7259 7260 // If this has an identifier, add it to the scope stack. 7261 if (TUK == TUK_Friend) { 7262 // We might be replacing an existing declaration in the lookup tables; 7263 // if so, borrow its access specifier. 7264 if (PrevDecl) 7265 New->setAccess(PrevDecl->getAccess()); 7266 7267 DeclContext *DC = New->getDeclContext()->getRedeclContext(); 7268 DC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 7269 if (Name) // can be null along some error paths 7270 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 7271 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false); 7272 } else if (Name) { 7273 S = getNonFieldDeclScope(S); 7274 PushOnScopeChains(New, S, !IsForwardReference); 7275 if (IsForwardReference) 7276 SearchDC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 7277 7278 } else { 7279 CurContext->addDecl(New); 7280 } 7281 7282 // If this is the C FILE type, notify the AST context. 7283 if (IdentifierInfo *II = New->getIdentifier()) 7284 if (!New->isInvalidDecl() && 7285 New->getDeclContext()->getRedeclContext()->isTranslationUnit() && 7286 II->isStr("FILE")) 7287 Context.setFILEDecl(New); 7288 7289 OwnedDecl = true; 7290 return New; 7291} 7292 7293void Sema::ActOnTagStartDefinition(Scope *S, Decl *TagD) { 7294 AdjustDeclIfTemplate(TagD); 7295 TagDecl *Tag = cast<TagDecl>(TagD); 7296 7297 // Enter the tag context. 7298 PushDeclContext(S, Tag); 7299} 7300 7301void Sema::ActOnStartCXXMemberDeclarations(Scope *S, Decl *TagD, 7302 SourceLocation FinalLoc, 7303 SourceLocation LBraceLoc) { 7304 AdjustDeclIfTemplate(TagD); 7305 CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD); 7306 7307 FieldCollector->StartClass(); 7308 7309 if (!Record->getIdentifier()) 7310 return; 7311 7312 if (FinalLoc.isValid()) 7313 Record->addAttr(new (Context) FinalAttr(FinalLoc, Context)); 7314 7315 // C++ [class]p2: 7316 // [...] The class-name is also inserted into the scope of the 7317 // class itself; this is known as the injected-class-name. For 7318 // purposes of access checking, the injected-class-name is treated 7319 // as if it were a public member name. 7320 CXXRecordDecl *InjectedClassName 7321 = CXXRecordDecl::Create(Context, Record->getTagKind(), CurContext, 7322 Record->getLocStart(), Record->getLocation(), 7323 Record->getIdentifier(), 7324 /*PrevDecl=*/0, 7325 /*DelayTypeCreation=*/true); 7326 Context.getTypeDeclType(InjectedClassName, Record); 7327 InjectedClassName->setImplicit(); 7328 InjectedClassName->setAccess(AS_public); 7329 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 7330 InjectedClassName->setDescribedClassTemplate(Template); 7331 PushOnScopeChains(InjectedClassName, S); 7332 assert(InjectedClassName->isInjectedClassName() && 7333 "Broken injected-class-name"); 7334} 7335 7336void Sema::ActOnTagFinishDefinition(Scope *S, Decl *TagD, 7337 SourceLocation RBraceLoc) { 7338 AdjustDeclIfTemplate(TagD); 7339 TagDecl *Tag = cast<TagDecl>(TagD); 7340 Tag->setRBraceLoc(RBraceLoc); 7341 7342 if (isa<CXXRecordDecl>(Tag)) 7343 FieldCollector->FinishClass(); 7344 7345 // Exit this scope of this tag's definition. 7346 PopDeclContext(); 7347 7348 // Notify the consumer that we've defined a tag. 7349 Consumer.HandleTagDeclDefinition(Tag); 7350} 7351 7352void Sema::ActOnTagDefinitionError(Scope *S, Decl *TagD) { 7353 AdjustDeclIfTemplate(TagD); 7354 TagDecl *Tag = cast<TagDecl>(TagD); 7355 Tag->setInvalidDecl(); 7356 7357 // We're undoing ActOnTagStartDefinition here, not 7358 // ActOnStartCXXMemberDeclarations, so we don't have to mess with 7359 // the FieldCollector. 7360 7361 PopDeclContext(); 7362} 7363 7364// Note that FieldName may be null for anonymous bitfields. 7365bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName, 7366 QualType FieldTy, const Expr *BitWidth, 7367 bool *ZeroWidth) { 7368 // Default to true; that shouldn't confuse checks for emptiness 7369 if (ZeroWidth) 7370 *ZeroWidth = true; 7371 7372 // C99 6.7.2.1p4 - verify the field type. 7373 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 7374 if (!FieldTy->isDependentType() && !FieldTy->isIntegralOrEnumerationType()) { 7375 // Handle incomplete types with specific error. 7376 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 7377 return true; 7378 if (FieldName) 7379 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 7380 << FieldName << FieldTy << BitWidth->getSourceRange(); 7381 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) 7382 << FieldTy << BitWidth->getSourceRange(); 7383 } else if (DiagnoseUnexpandedParameterPack(const_cast<Expr *>(BitWidth), 7384 UPPC_BitFieldWidth)) 7385 return true; 7386 7387 // If the bit-width is type- or value-dependent, don't try to check 7388 // it now. 7389 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 7390 return false; 7391 7392 llvm::APSInt Value; 7393 if (VerifyIntegerConstantExpression(BitWidth, &Value)) 7394 return true; 7395 7396 if (Value != 0 && ZeroWidth) 7397 *ZeroWidth = false; 7398 7399 // Zero-width bitfield is ok for anonymous field. 7400 if (Value == 0 && FieldName) 7401 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 7402 7403 if (Value.isSigned() && Value.isNegative()) { 7404 if (FieldName) 7405 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 7406 << FieldName << Value.toString(10); 7407 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) 7408 << Value.toString(10); 7409 } 7410 7411 if (!FieldTy->isDependentType()) { 7412 uint64_t TypeSize = Context.getTypeSize(FieldTy); 7413 if (Value.getZExtValue() > TypeSize) { 7414 if (!getLangOptions().CPlusPlus) { 7415 if (FieldName) 7416 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 7417 << FieldName << (unsigned)Value.getZExtValue() 7418 << (unsigned)TypeSize; 7419 7420 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) 7421 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 7422 } 7423 7424 if (FieldName) 7425 Diag(FieldLoc, diag::warn_bitfield_width_exceeds_type_size) 7426 << FieldName << (unsigned)Value.getZExtValue() 7427 << (unsigned)TypeSize; 7428 else 7429 Diag(FieldLoc, diag::warn_anon_bitfield_width_exceeds_type_size) 7430 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 7431 } 7432 } 7433 7434 return false; 7435} 7436 7437/// ActOnField - Each field of a struct/union/class is passed into this in order 7438/// to create a FieldDecl object for it. 7439Decl *Sema::ActOnField(Scope *S, Decl *TagD, 7440 SourceLocation DeclStart, 7441 Declarator &D, ExprTy *BitfieldWidth) { 7442 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD), 7443 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 7444 AS_public); 7445 return Res; 7446} 7447 7448/// HandleField - Analyze a field of a C struct or a C++ data member. 7449/// 7450FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 7451 SourceLocation DeclStart, 7452 Declarator &D, Expr *BitWidth, 7453 AccessSpecifier AS) { 7454 IdentifierInfo *II = D.getIdentifier(); 7455 SourceLocation Loc = DeclStart; 7456 if (II) Loc = D.getIdentifierLoc(); 7457 7458 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 7459 QualType T = TInfo->getType(); 7460 if (getLangOptions().CPlusPlus) { 7461 CheckExtraCXXDefaultArguments(D); 7462 7463 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 7464 UPPC_DataMemberType)) { 7465 D.setInvalidType(); 7466 T = Context.IntTy; 7467 TInfo = Context.getTrivialTypeSourceInfo(T, Loc); 7468 } 7469 } 7470 7471 DiagnoseFunctionSpecifiers(D); 7472 7473 if (D.getDeclSpec().isThreadSpecified()) 7474 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 7475 7476 // Check to see if this name was declared as a member previously 7477 LookupResult Previous(*this, II, Loc, LookupMemberName, ForRedeclaration); 7478 LookupName(Previous, S); 7479 assert((Previous.empty() || Previous.isOverloadedResult() || 7480 Previous.isSingleResult()) 7481 && "Lookup of member name should be either overloaded, single or null"); 7482 7483 // If the name is overloaded then get any declaration else get the single result 7484 NamedDecl *PrevDecl = Previous.isOverloadedResult() ? 7485 Previous.getRepresentativeDecl() : Previous.getAsSingle<NamedDecl>(); 7486 7487 if (PrevDecl && PrevDecl->isTemplateParameter()) { 7488 // Maybe we will complain about the shadowed template parameter. 7489 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 7490 // Just pretend that we didn't see the previous declaration. 7491 PrevDecl = 0; 7492 } 7493 7494 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 7495 PrevDecl = 0; 7496 7497 bool Mutable 7498 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable); 7499 SourceLocation TSSL = D.getSourceRange().getBegin(); 7500 FieldDecl *NewFD 7501 = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, TSSL, 7502 AS, PrevDecl, &D); 7503 7504 if (NewFD->isInvalidDecl()) 7505 Record->setInvalidDecl(); 7506 7507 if (NewFD->isInvalidDecl() && PrevDecl) { 7508 // Don't introduce NewFD into scope; there's already something 7509 // with the same name in the same scope. 7510 } else if (II) { 7511 PushOnScopeChains(NewFD, S); 7512 } else 7513 Record->addDecl(NewFD); 7514 7515 return NewFD; 7516} 7517 7518/// \brief Build a new FieldDecl and check its well-formedness. 7519/// 7520/// This routine builds a new FieldDecl given the fields name, type, 7521/// record, etc. \p PrevDecl should refer to any previous declaration 7522/// with the same name and in the same scope as the field to be 7523/// created. 7524/// 7525/// \returns a new FieldDecl. 7526/// 7527/// \todo The Declarator argument is a hack. It will be removed once 7528FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 7529 TypeSourceInfo *TInfo, 7530 RecordDecl *Record, SourceLocation Loc, 7531 bool Mutable, Expr *BitWidth, 7532 SourceLocation TSSL, 7533 AccessSpecifier AS, NamedDecl *PrevDecl, 7534 Declarator *D) { 7535 IdentifierInfo *II = Name.getAsIdentifierInfo(); 7536 bool InvalidDecl = false; 7537 if (D) InvalidDecl = D->isInvalidType(); 7538 7539 // If we receive a broken type, recover by assuming 'int' and 7540 // marking this declaration as invalid. 7541 if (T.isNull()) { 7542 InvalidDecl = true; 7543 T = Context.IntTy; 7544 } 7545 7546 QualType EltTy = Context.getBaseElementType(T); 7547 if (!EltTy->isDependentType() && 7548 RequireCompleteType(Loc, EltTy, diag::err_field_incomplete)) { 7549 // Fields of incomplete type force their record to be invalid. 7550 Record->setInvalidDecl(); 7551 InvalidDecl = true; 7552 } 7553 7554 // C99 6.7.2.1p8: A member of a structure or union may have any type other 7555 // than a variably modified type. 7556 if (!InvalidDecl && T->isVariablyModifiedType()) { 7557 bool SizeIsNegative; 7558 llvm::APSInt Oversized; 7559 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 7560 SizeIsNegative, 7561 Oversized); 7562 if (!FixedTy.isNull()) { 7563 Diag(Loc, diag::warn_illegal_constant_array_size); 7564 T = FixedTy; 7565 } else { 7566 if (SizeIsNegative) 7567 Diag(Loc, diag::err_typecheck_negative_array_size); 7568 else if (Oversized.getBoolValue()) 7569 Diag(Loc, diag::err_array_too_large) 7570 << Oversized.toString(10); 7571 else 7572 Diag(Loc, diag::err_typecheck_field_variable_size); 7573 InvalidDecl = true; 7574 } 7575 } 7576 7577 // Fields can not have abstract class types 7578 if (!InvalidDecl && RequireNonAbstractType(Loc, T, 7579 diag::err_abstract_type_in_decl, 7580 AbstractFieldType)) 7581 InvalidDecl = true; 7582 7583 bool ZeroWidth = false; 7584 // If this is declared as a bit-field, check the bit-field. 7585 if (!InvalidDecl && BitWidth && 7586 VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth)) { 7587 InvalidDecl = true; 7588 BitWidth = 0; 7589 ZeroWidth = false; 7590 } 7591 7592 // Check that 'mutable' is consistent with the type of the declaration. 7593 if (!InvalidDecl && Mutable) { 7594 unsigned DiagID = 0; 7595 if (T->isReferenceType()) 7596 DiagID = diag::err_mutable_reference; 7597 else if (T.isConstQualified()) 7598 DiagID = diag::err_mutable_const; 7599 7600 if (DiagID) { 7601 SourceLocation ErrLoc = Loc; 7602 if (D && D->getDeclSpec().getStorageClassSpecLoc().isValid()) 7603 ErrLoc = D->getDeclSpec().getStorageClassSpecLoc(); 7604 Diag(ErrLoc, DiagID); 7605 Mutable = false; 7606 InvalidDecl = true; 7607 } 7608 } 7609 7610 FieldDecl *NewFD = FieldDecl::Create(Context, Record, TSSL, Loc, II, T, TInfo, 7611 BitWidth, Mutable); 7612 if (InvalidDecl) 7613 NewFD->setInvalidDecl(); 7614 7615 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 7616 Diag(Loc, diag::err_duplicate_member) << II; 7617 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 7618 NewFD->setInvalidDecl(); 7619 } 7620 7621 if (!InvalidDecl && getLangOptions().CPlusPlus) { 7622 if (Record->isUnion()) { 7623 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 7624 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 7625 if (RDecl->getDefinition()) { 7626 // C++ [class.union]p1: An object of a class with a non-trivial 7627 // constructor, a non-trivial copy constructor, a non-trivial 7628 // destructor, or a non-trivial copy assignment operator 7629 // cannot be a member of a union, nor can an array of such 7630 // objects. 7631 if (!getLangOptions().CPlusPlus0x && CheckNontrivialField(NewFD)) 7632 NewFD->setInvalidDecl(); 7633 } 7634 } 7635 7636 // C++ [class.union]p1: If a union contains a member of reference type, 7637 // the program is ill-formed. 7638 if (EltTy->isReferenceType()) { 7639 Diag(NewFD->getLocation(), diag::err_union_member_of_reference_type) 7640 << NewFD->getDeclName() << EltTy; 7641 NewFD->setInvalidDecl(); 7642 } 7643 } 7644 } 7645 7646 // FIXME: We need to pass in the attributes given an AST 7647 // representation, not a parser representation. 7648 if (D) 7649 // FIXME: What to pass instead of TUScope? 7650 ProcessDeclAttributes(TUScope, NewFD, *D); 7651 7652 if (T.isObjCGCWeak()) 7653 Diag(Loc, diag::warn_attribute_weak_on_field); 7654 7655 NewFD->setAccess(AS); 7656 return NewFD; 7657} 7658 7659bool Sema::CheckNontrivialField(FieldDecl *FD) { 7660 assert(FD); 7661 assert(getLangOptions().CPlusPlus && "valid check only for C++"); 7662 7663 if (FD->isInvalidDecl()) 7664 return true; 7665 7666 QualType EltTy = Context.getBaseElementType(FD->getType()); 7667 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 7668 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 7669 if (RDecl->getDefinition()) { 7670 // We check for copy constructors before constructors 7671 // because otherwise we'll never get complaints about 7672 // copy constructors. 7673 7674 CXXSpecialMember member = CXXInvalid; 7675 if (!RDecl->hasTrivialCopyConstructor()) 7676 member = CXXCopyConstructor; 7677 else if (!RDecl->hasTrivialDefaultConstructor()) 7678 member = CXXDefaultConstructor; 7679 else if (!RDecl->hasTrivialCopyAssignment()) 7680 member = CXXCopyAssignment; 7681 else if (!RDecl->hasTrivialDestructor()) 7682 member = CXXDestructor; 7683 7684 if (member != CXXInvalid) { 7685 Diag(FD->getLocation(), diag::err_illegal_union_or_anon_struct_member) 7686 << (int)FD->getParent()->isUnion() << FD->getDeclName() << member; 7687 DiagnoseNontrivial(RT, member); 7688 return true; 7689 } 7690 } 7691 } 7692 7693 return false; 7694} 7695 7696/// DiagnoseNontrivial - Given that a class has a non-trivial 7697/// special member, figure out why. 7698void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) { 7699 QualType QT(T, 0U); 7700 CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl()); 7701 7702 // Check whether the member was user-declared. 7703 switch (member) { 7704 case CXXInvalid: 7705 break; 7706 7707 case CXXDefaultConstructor: 7708 if (RD->hasUserDeclaredConstructor()) { 7709 typedef CXXRecordDecl::ctor_iterator ctor_iter; 7710 for (ctor_iter ci = RD->ctor_begin(), ce = RD->ctor_end(); ci != ce;++ci){ 7711 const FunctionDecl *body = 0; 7712 ci->hasBody(body); 7713 if (!body || !cast<CXXConstructorDecl>(body)->isImplicitlyDefined()) { 7714 SourceLocation CtorLoc = ci->getLocation(); 7715 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 7716 return; 7717 } 7718 } 7719 7720 assert(0 && "found no user-declared constructors"); 7721 return; 7722 } 7723 break; 7724 7725 case CXXCopyConstructor: 7726 if (RD->hasUserDeclaredCopyConstructor()) { 7727 SourceLocation CtorLoc = 7728 RD->getCopyConstructor(Context, 0)->getLocation(); 7729 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 7730 return; 7731 } 7732 break; 7733 7734 case CXXCopyAssignment: 7735 if (RD->hasUserDeclaredCopyAssignment()) { 7736 // FIXME: this should use the location of the copy 7737 // assignment, not the type. 7738 SourceLocation TyLoc = RD->getSourceRange().getBegin(); 7739 Diag(TyLoc, diag::note_nontrivial_user_defined) << QT << member; 7740 return; 7741 } 7742 break; 7743 7744 case CXXDestructor: 7745 if (RD->hasUserDeclaredDestructor()) { 7746 SourceLocation DtorLoc = LookupDestructor(RD)->getLocation(); 7747 Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member; 7748 return; 7749 } 7750 break; 7751 } 7752 7753 typedef CXXRecordDecl::base_class_iterator base_iter; 7754 7755 // Virtual bases and members inhibit trivial copying/construction, 7756 // but not trivial destruction. 7757 if (member != CXXDestructor) { 7758 // Check for virtual bases. vbases includes indirect virtual bases, 7759 // so we just iterate through the direct bases. 7760 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) 7761 if (bi->isVirtual()) { 7762 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 7763 Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1; 7764 return; 7765 } 7766 7767 // Check for virtual methods. 7768 typedef CXXRecordDecl::method_iterator meth_iter; 7769 for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me; 7770 ++mi) { 7771 if (mi->isVirtual()) { 7772 SourceLocation MLoc = mi->getSourceRange().getBegin(); 7773 Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0; 7774 return; 7775 } 7776 } 7777 } 7778 7779 bool (CXXRecordDecl::*hasTrivial)() const; 7780 switch (member) { 7781 case CXXDefaultConstructor: 7782 hasTrivial = &CXXRecordDecl::hasTrivialDefaultConstructor; break; 7783 case CXXCopyConstructor: 7784 hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break; 7785 case CXXCopyAssignment: 7786 hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break; 7787 case CXXDestructor: 7788 hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break; 7789 default: 7790 assert(0 && "unexpected special member"); return; 7791 } 7792 7793 // Check for nontrivial bases (and recurse). 7794 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) { 7795 const RecordType *BaseRT = bi->getType()->getAs<RecordType>(); 7796 assert(BaseRT && "Don't know how to handle dependent bases"); 7797 CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl()); 7798 if (!(BaseRecTy->*hasTrivial)()) { 7799 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 7800 Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member; 7801 DiagnoseNontrivial(BaseRT, member); 7802 return; 7803 } 7804 } 7805 7806 // Check for nontrivial members (and recurse). 7807 typedef RecordDecl::field_iterator field_iter; 7808 for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe; 7809 ++fi) { 7810 QualType EltTy = Context.getBaseElementType((*fi)->getType()); 7811 if (const RecordType *EltRT = EltTy->getAs<RecordType>()) { 7812 CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl()); 7813 7814 if (!(EltRD->*hasTrivial)()) { 7815 SourceLocation FLoc = (*fi)->getLocation(); 7816 Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member; 7817 DiagnoseNontrivial(EltRT, member); 7818 return; 7819 } 7820 } 7821 } 7822 7823 assert(0 && "found no explanation for non-trivial member"); 7824} 7825 7826/// TranslateIvarVisibility - Translate visibility from a token ID to an 7827/// AST enum value. 7828static ObjCIvarDecl::AccessControl 7829TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 7830 switch (ivarVisibility) { 7831 default: assert(0 && "Unknown visitibility kind"); 7832 case tok::objc_private: return ObjCIvarDecl::Private; 7833 case tok::objc_public: return ObjCIvarDecl::Public; 7834 case tok::objc_protected: return ObjCIvarDecl::Protected; 7835 case tok::objc_package: return ObjCIvarDecl::Package; 7836 } 7837} 7838 7839/// ActOnIvar - Each ivar field of an objective-c class is passed into this 7840/// in order to create an IvarDecl object for it. 7841Decl *Sema::ActOnIvar(Scope *S, 7842 SourceLocation DeclStart, 7843 Decl *IntfDecl, 7844 Declarator &D, ExprTy *BitfieldWidth, 7845 tok::ObjCKeywordKind Visibility) { 7846 7847 IdentifierInfo *II = D.getIdentifier(); 7848 Expr *BitWidth = (Expr*)BitfieldWidth; 7849 SourceLocation Loc = DeclStart; 7850 if (II) Loc = D.getIdentifierLoc(); 7851 7852 // FIXME: Unnamed fields can be handled in various different ways, for 7853 // example, unnamed unions inject all members into the struct namespace! 7854 7855 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 7856 QualType T = TInfo->getType(); 7857 7858 if (BitWidth) { 7859 // 6.7.2.1p3, 6.7.2.1p4 7860 if (VerifyBitField(Loc, II, T, BitWidth)) { 7861 D.setInvalidType(); 7862 BitWidth = 0; 7863 } 7864 } else { 7865 // Not a bitfield. 7866 7867 // validate II. 7868 7869 } 7870 if (T->isReferenceType()) { 7871 Diag(Loc, diag::err_ivar_reference_type); 7872 D.setInvalidType(); 7873 } 7874 // C99 6.7.2.1p8: A member of a structure or union may have any type other 7875 // than a variably modified type. 7876 else if (T->isVariablyModifiedType()) { 7877 Diag(Loc, diag::err_typecheck_ivar_variable_size); 7878 D.setInvalidType(); 7879 } 7880 7881 // Get the visibility (access control) for this ivar. 7882 ObjCIvarDecl::AccessControl ac = 7883 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 7884 : ObjCIvarDecl::None; 7885 // Must set ivar's DeclContext to its enclosing interface. 7886 ObjCContainerDecl *EnclosingDecl = cast<ObjCContainerDecl>(IntfDecl); 7887 ObjCContainerDecl *EnclosingContext; 7888 if (ObjCImplementationDecl *IMPDecl = 7889 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 7890 if (!LangOpts.ObjCNonFragileABI2) { 7891 // Case of ivar declared in an implementation. Context is that of its class. 7892 EnclosingContext = IMPDecl->getClassInterface(); 7893 assert(EnclosingContext && "Implementation has no class interface!"); 7894 } 7895 else 7896 EnclosingContext = EnclosingDecl; 7897 } else { 7898 if (ObjCCategoryDecl *CDecl = 7899 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 7900 if (!LangOpts.ObjCNonFragileABI2 || !CDecl->IsClassExtension()) { 7901 Diag(Loc, diag::err_misplaced_ivar) << CDecl->IsClassExtension(); 7902 return 0; 7903 } 7904 } 7905 EnclosingContext = EnclosingDecl; 7906 } 7907 7908 // Construct the decl. 7909 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, EnclosingContext, 7910 DeclStart, Loc, II, T, 7911 TInfo, ac, (Expr *)BitfieldWidth); 7912 7913 if (II) { 7914 NamedDecl *PrevDecl = LookupSingleName(S, II, Loc, LookupMemberName, 7915 ForRedeclaration); 7916 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S) 7917 && !isa<TagDecl>(PrevDecl)) { 7918 Diag(Loc, diag::err_duplicate_member) << II; 7919 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 7920 NewID->setInvalidDecl(); 7921 } 7922 } 7923 7924 // Process attributes attached to the ivar. 7925 ProcessDeclAttributes(S, NewID, D); 7926 7927 if (D.isInvalidType()) 7928 NewID->setInvalidDecl(); 7929 7930 if (II) { 7931 // FIXME: When interfaces are DeclContexts, we'll need to add 7932 // these to the interface. 7933 S->AddDecl(NewID); 7934 IdResolver.AddDecl(NewID); 7935 } 7936 7937 return NewID; 7938} 7939 7940/// ActOnLastBitfield - This routine handles synthesized bitfields rules for 7941/// class and class extensions. For every class @interface and class 7942/// extension @interface, if the last ivar is a bitfield of any type, 7943/// then add an implicit `char :0` ivar to the end of that interface. 7944void Sema::ActOnLastBitfield(SourceLocation DeclLoc, Decl *EnclosingDecl, 7945 llvm::SmallVectorImpl<Decl *> &AllIvarDecls) { 7946 if (!LangOpts.ObjCNonFragileABI2 || AllIvarDecls.empty()) 7947 return; 7948 7949 Decl *ivarDecl = AllIvarDecls[AllIvarDecls.size()-1]; 7950 ObjCIvarDecl *Ivar = cast<ObjCIvarDecl>(ivarDecl); 7951 7952 if (!Ivar->isBitField()) 7953 return; 7954 uint64_t BitFieldSize = 7955 Ivar->getBitWidth()->EvaluateAsInt(Context).getZExtValue(); 7956 if (BitFieldSize == 0) 7957 return; 7958 ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl); 7959 if (!ID) { 7960 if (ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 7961 if (!CD->IsClassExtension()) 7962 return; 7963 } 7964 // No need to add this to end of @implementation. 7965 else 7966 return; 7967 } 7968 // All conditions are met. Add a new bitfield to the tail end of ivars. 7969 llvm::APInt Zero(Context.getTypeSize(Context.CharTy), 0); 7970 Expr * BW = IntegerLiteral::Create(Context, Zero, Context.CharTy, DeclLoc); 7971 7972 Ivar = ObjCIvarDecl::Create(Context, cast<ObjCContainerDecl>(EnclosingDecl), 7973 DeclLoc, DeclLoc, 0, 7974 Context.CharTy, 7975 Context.CreateTypeSourceInfo(Context.CharTy), 7976 ObjCIvarDecl::Private, BW, 7977 true); 7978 AllIvarDecls.push_back(Ivar); 7979} 7980 7981void Sema::ActOnFields(Scope* S, 7982 SourceLocation RecLoc, Decl *EnclosingDecl, 7983 Decl **Fields, unsigned NumFields, 7984 SourceLocation LBrac, SourceLocation RBrac, 7985 AttributeList *Attr) { 7986 assert(EnclosingDecl && "missing record or interface decl"); 7987 7988 // If the decl this is being inserted into is invalid, then it may be a 7989 // redeclaration or some other bogus case. Don't try to add fields to it. 7990 if (EnclosingDecl->isInvalidDecl()) { 7991 // FIXME: Deallocate fields? 7992 return; 7993 } 7994 7995 7996 // Verify that all the fields are okay. 7997 unsigned NumNamedMembers = 0; 7998 llvm::SmallVector<FieldDecl*, 32> RecFields; 7999 8000 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 8001 for (unsigned i = 0; i != NumFields; ++i) { 8002 FieldDecl *FD = cast<FieldDecl>(Fields[i]); 8003 8004 // Get the type for the field. 8005 const Type *FDTy = FD->getType().getTypePtr(); 8006 8007 if (!FD->isAnonymousStructOrUnion()) { 8008 // Remember all fields written by the user. 8009 RecFields.push_back(FD); 8010 } 8011 8012 // If the field is already invalid for some reason, don't emit more 8013 // diagnostics about it. 8014 if (FD->isInvalidDecl()) { 8015 EnclosingDecl->setInvalidDecl(); 8016 continue; 8017 } 8018 8019 // C99 6.7.2.1p2: 8020 // A structure or union shall not contain a member with 8021 // incomplete or function type (hence, a structure shall not 8022 // contain an instance of itself, but may contain a pointer to 8023 // an instance of itself), except that the last member of a 8024 // structure with more than one named member may have incomplete 8025 // array type; such a structure (and any union containing, 8026 // possibly recursively, a member that is such a structure) 8027 // shall not be a member of a structure or an element of an 8028 // array. 8029 if (FDTy->isFunctionType()) { 8030 // Field declared as a function. 8031 Diag(FD->getLocation(), diag::err_field_declared_as_function) 8032 << FD->getDeclName(); 8033 FD->setInvalidDecl(); 8034 EnclosingDecl->setInvalidDecl(); 8035 continue; 8036 } else if (FDTy->isIncompleteArrayType() && Record && 8037 ((i == NumFields - 1 && !Record->isUnion()) || 8038 ((getLangOptions().Microsoft || getLangOptions().CPlusPlus) && 8039 (i == NumFields - 1 || Record->isUnion())))) { 8040 // Flexible array member. 8041 // Microsoft and g++ is more permissive regarding flexible array. 8042 // It will accept flexible array in union and also 8043 // as the sole element of a struct/class. 8044 if (getLangOptions().Microsoft) { 8045 if (Record->isUnion()) 8046 Diag(FD->getLocation(), diag::ext_flexible_array_union_ms) 8047 << FD->getDeclName(); 8048 else if (NumFields == 1) 8049 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_ms) 8050 << FD->getDeclName() << Record->getTagKind(); 8051 } else if (getLangOptions().CPlusPlus) { 8052 if (Record->isUnion()) 8053 Diag(FD->getLocation(), diag::ext_flexible_array_union_gnu) 8054 << FD->getDeclName(); 8055 else if (NumFields == 1) 8056 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_gnu) 8057 << FD->getDeclName() << Record->getTagKind(); 8058 } else if (NumNamedMembers < 1) { 8059 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 8060 << FD->getDeclName(); 8061 FD->setInvalidDecl(); 8062 EnclosingDecl->setInvalidDecl(); 8063 continue; 8064 } 8065 if (!FD->getType()->isDependentType() && 8066 !Context.getBaseElementType(FD->getType())->isPODType()) { 8067 Diag(FD->getLocation(), diag::err_flexible_array_has_nonpod_type) 8068 << FD->getDeclName() << FD->getType(); 8069 FD->setInvalidDecl(); 8070 EnclosingDecl->setInvalidDecl(); 8071 continue; 8072 } 8073 // Okay, we have a legal flexible array member at the end of the struct. 8074 if (Record) 8075 Record->setHasFlexibleArrayMember(true); 8076 } else if (!FDTy->isDependentType() && 8077 RequireCompleteType(FD->getLocation(), FD->getType(), 8078 diag::err_field_incomplete)) { 8079 // Incomplete type 8080 FD->setInvalidDecl(); 8081 EnclosingDecl->setInvalidDecl(); 8082 continue; 8083 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) { 8084 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 8085 // If this is a member of a union, then entire union becomes "flexible". 8086 if (Record && Record->isUnion()) { 8087 Record->setHasFlexibleArrayMember(true); 8088 } else { 8089 // If this is a struct/class and this is not the last element, reject 8090 // it. Note that GCC supports variable sized arrays in the middle of 8091 // structures. 8092 if (i != NumFields-1) 8093 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 8094 << FD->getDeclName() << FD->getType(); 8095 else { 8096 // We support flexible arrays at the end of structs in 8097 // other structs as an extension. 8098 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 8099 << FD->getDeclName(); 8100 if (Record) 8101 Record->setHasFlexibleArrayMember(true); 8102 } 8103 } 8104 } 8105 if (Record && FDTTy->getDecl()->hasObjectMember()) 8106 Record->setHasObjectMember(true); 8107 } else if (FDTy->isObjCObjectType()) { 8108 /// A field cannot be an Objective-c object 8109 Diag(FD->getLocation(), diag::err_statically_allocated_object); 8110 FD->setInvalidDecl(); 8111 EnclosingDecl->setInvalidDecl(); 8112 continue; 8113 } else if (getLangOptions().ObjC1 && 8114 getLangOptions().getGCMode() != LangOptions::NonGC && 8115 Record && 8116 (FD->getType()->isObjCObjectPointerType() || 8117 FD->getType().isObjCGCStrong())) 8118 Record->setHasObjectMember(true); 8119 else if (Context.getAsArrayType(FD->getType())) { 8120 QualType BaseType = Context.getBaseElementType(FD->getType()); 8121 if (Record && BaseType->isRecordType() && 8122 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()) 8123 Record->setHasObjectMember(true); 8124 } 8125 // Keep track of the number of named members. 8126 if (FD->getIdentifier()) 8127 ++NumNamedMembers; 8128 } 8129 8130 // Okay, we successfully defined 'Record'. 8131 if (Record) { 8132 bool Completed = false; 8133 if (CXXRecordDecl *CXXRecord = dyn_cast<CXXRecordDecl>(Record)) { 8134 if (!CXXRecord->isInvalidDecl()) { 8135 // Set access bits correctly on the directly-declared conversions. 8136 UnresolvedSetImpl *Convs = CXXRecord->getConversionFunctions(); 8137 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); 8138 I != E; ++I) 8139 Convs->setAccess(I, (*I)->getAccess()); 8140 8141 if (!CXXRecord->isDependentType()) { 8142 // Adjust user-defined destructor exception spec. 8143 if (getLangOptions().CPlusPlus0x && 8144 CXXRecord->hasUserDeclaredDestructor()) 8145 AdjustDestructorExceptionSpec(CXXRecord,CXXRecord->getDestructor()); 8146 8147 // Add any implicitly-declared members to this class. 8148 AddImplicitlyDeclaredMembersToClass(CXXRecord); 8149 8150 // If we have virtual base classes, we may end up finding multiple 8151 // final overriders for a given virtual function. Check for this 8152 // problem now. 8153 if (CXXRecord->getNumVBases()) { 8154 CXXFinalOverriderMap FinalOverriders; 8155 CXXRecord->getFinalOverriders(FinalOverriders); 8156 8157 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 8158 MEnd = FinalOverriders.end(); 8159 M != MEnd; ++M) { 8160 for (OverridingMethods::iterator SO = M->second.begin(), 8161 SOEnd = M->second.end(); 8162 SO != SOEnd; ++SO) { 8163 assert(SO->second.size() > 0 && 8164 "Virtual function without overridding functions?"); 8165 if (SO->second.size() == 1) 8166 continue; 8167 8168 // C++ [class.virtual]p2: 8169 // In a derived class, if a virtual member function of a base 8170 // class subobject has more than one final overrider the 8171 // program is ill-formed. 8172 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 8173 << (NamedDecl *)M->first << Record; 8174 Diag(M->first->getLocation(), 8175 diag::note_overridden_virtual_function); 8176 for (OverridingMethods::overriding_iterator 8177 OM = SO->second.begin(), 8178 OMEnd = SO->second.end(); 8179 OM != OMEnd; ++OM) 8180 Diag(OM->Method->getLocation(), diag::note_final_overrider) 8181 << (NamedDecl *)M->first << OM->Method->getParent(); 8182 8183 Record->setInvalidDecl(); 8184 } 8185 } 8186 CXXRecord->completeDefinition(&FinalOverriders); 8187 Completed = true; 8188 } 8189 } 8190 } 8191 } 8192 8193 if (!Completed) 8194 Record->completeDefinition(); 8195 8196 // Now that the record is complete, do any delayed exception spec checks 8197 // we were missing. 8198 if (!DelayedDestructorExceptionSpecChecks.empty()) { 8199 const CXXDestructorDecl *Dtor = 8200 DelayedDestructorExceptionSpecChecks.back().first; 8201 if (Dtor->getParent() == Record) { 8202 CheckOverridingFunctionExceptionSpec(Dtor, 8203 DelayedDestructorExceptionSpecChecks.back().second); 8204 DelayedDestructorExceptionSpecChecks.pop_back(); 8205 } 8206 } 8207 8208 } else { 8209 ObjCIvarDecl **ClsFields = 8210 reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); 8211 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 8212 ID->setLocEnd(RBrac); 8213 // Add ivar's to class's DeclContext. 8214 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 8215 ClsFields[i]->setLexicalDeclContext(ID); 8216 ID->addDecl(ClsFields[i]); 8217 } 8218 // Must enforce the rule that ivars in the base classes may not be 8219 // duplicates. 8220 if (ID->getSuperClass()) 8221 DiagnoseDuplicateIvars(ID, ID->getSuperClass()); 8222 } else if (ObjCImplementationDecl *IMPDecl = 8223 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 8224 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 8225 for (unsigned I = 0, N = RecFields.size(); I != N; ++I) 8226 // Ivar declared in @implementation never belongs to the implementation. 8227 // Only it is in implementation's lexical context. 8228 ClsFields[I]->setLexicalDeclContext(IMPDecl); 8229 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 8230 } else if (ObjCCategoryDecl *CDecl = 8231 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 8232 // case of ivars in class extension; all other cases have been 8233 // reported as errors elsewhere. 8234 // FIXME. Class extension does not have a LocEnd field. 8235 // CDecl->setLocEnd(RBrac); 8236 // Add ivar's to class extension's DeclContext. 8237 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 8238 ClsFields[i]->setLexicalDeclContext(CDecl); 8239 CDecl->addDecl(ClsFields[i]); 8240 } 8241 } 8242 } 8243 8244 if (Attr) 8245 ProcessDeclAttributeList(S, Record, Attr); 8246 8247 // If there's a #pragma GCC visibility in scope, and this isn't a subclass, 8248 // set the visibility of this record. 8249 if (Record && !Record->getDeclContext()->isRecord()) 8250 AddPushedVisibilityAttribute(Record); 8251} 8252 8253/// \brief Determine whether the given integral value is representable within 8254/// the given type T. 8255static bool isRepresentableIntegerValue(ASTContext &Context, 8256 llvm::APSInt &Value, 8257 QualType T) { 8258 assert(T->isIntegralType(Context) && "Integral type required!"); 8259 unsigned BitWidth = Context.getIntWidth(T); 8260 8261 if (Value.isUnsigned() || Value.isNonNegative()) { 8262 if (T->isSignedIntegerType()) 8263 --BitWidth; 8264 return Value.getActiveBits() <= BitWidth; 8265 } 8266 return Value.getMinSignedBits() <= BitWidth; 8267} 8268 8269// \brief Given an integral type, return the next larger integral type 8270// (or a NULL type of no such type exists). 8271static QualType getNextLargerIntegralType(ASTContext &Context, QualType T) { 8272 // FIXME: Int128/UInt128 support, which also needs to be introduced into 8273 // enum checking below. 8274 assert(T->isIntegralType(Context) && "Integral type required!"); 8275 const unsigned NumTypes = 4; 8276 QualType SignedIntegralTypes[NumTypes] = { 8277 Context.ShortTy, Context.IntTy, Context.LongTy, Context.LongLongTy 8278 }; 8279 QualType UnsignedIntegralTypes[NumTypes] = { 8280 Context.UnsignedShortTy, Context.UnsignedIntTy, Context.UnsignedLongTy, 8281 Context.UnsignedLongLongTy 8282 }; 8283 8284 unsigned BitWidth = Context.getTypeSize(T); 8285 QualType *Types = T->isSignedIntegerType()? SignedIntegralTypes 8286 : UnsignedIntegralTypes; 8287 for (unsigned I = 0; I != NumTypes; ++I) 8288 if (Context.getTypeSize(Types[I]) > BitWidth) 8289 return Types[I]; 8290 8291 return QualType(); 8292} 8293 8294EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 8295 EnumConstantDecl *LastEnumConst, 8296 SourceLocation IdLoc, 8297 IdentifierInfo *Id, 8298 Expr *Val) { 8299 unsigned IntWidth = Context.Target.getIntWidth(); 8300 llvm::APSInt EnumVal(IntWidth); 8301 QualType EltTy; 8302 8303 if (Val && DiagnoseUnexpandedParameterPack(Val, UPPC_EnumeratorValue)) 8304 Val = 0; 8305 8306 if (Val) { 8307 if (Enum->isDependentType() || Val->isTypeDependent()) 8308 EltTy = Context.DependentTy; 8309 else { 8310 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 8311 SourceLocation ExpLoc; 8312 if (!Val->isValueDependent() && 8313 VerifyIntegerConstantExpression(Val, &EnumVal)) { 8314 Val = 0; 8315 } else { 8316 if (!getLangOptions().CPlusPlus) { 8317 // C99 6.7.2.2p2: 8318 // The expression that defines the value of an enumeration constant 8319 // shall be an integer constant expression that has a value 8320 // representable as an int. 8321 8322 // Complain if the value is not representable in an int. 8323 if (!isRepresentableIntegerValue(Context, EnumVal, Context.IntTy)) 8324 Diag(IdLoc, diag::ext_enum_value_not_int) 8325 << EnumVal.toString(10) << Val->getSourceRange() 8326 << (EnumVal.isUnsigned() || EnumVal.isNonNegative()); 8327 else if (!Context.hasSameType(Val->getType(), Context.IntTy)) { 8328 // Force the type of the expression to 'int'. 8329 Val = ImpCastExprToType(Val, Context.IntTy, CK_IntegralCast).take(); 8330 } 8331 } 8332 8333 if (Enum->isFixed()) { 8334 EltTy = Enum->getIntegerType(); 8335 8336 // C++0x [dcl.enum]p5: 8337 // ... if the initializing value of an enumerator cannot be 8338 // represented by the underlying type, the program is ill-formed. 8339 if (!isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 8340 if (getLangOptions().Microsoft) { 8341 Diag(IdLoc, diag::ext_enumerator_too_large) << EltTy; 8342 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 8343 } else 8344 Diag(IdLoc, diag::err_enumerator_too_large) 8345 << EltTy; 8346 } else 8347 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 8348 } 8349 else { 8350 // C++0x [dcl.enum]p5: 8351 // If the underlying type is not fixed, the type of each enumerator 8352 // is the type of its initializing value: 8353 // - If an initializer is specified for an enumerator, the 8354 // initializing value has the same type as the expression. 8355 EltTy = Val->getType(); 8356 } 8357 } 8358 } 8359 } 8360 8361 if (!Val) { 8362 if (Enum->isDependentType()) 8363 EltTy = Context.DependentTy; 8364 else if (!LastEnumConst) { 8365 // C++0x [dcl.enum]p5: 8366 // If the underlying type is not fixed, the type of each enumerator 8367 // is the type of its initializing value: 8368 // - If no initializer is specified for the first enumerator, the 8369 // initializing value has an unspecified integral type. 8370 // 8371 // GCC uses 'int' for its unspecified integral type, as does 8372 // C99 6.7.2.2p3. 8373 if (Enum->isFixed()) { 8374 EltTy = Enum->getIntegerType(); 8375 } 8376 else { 8377 EltTy = Context.IntTy; 8378 } 8379 } else { 8380 // Assign the last value + 1. 8381 EnumVal = LastEnumConst->getInitVal(); 8382 ++EnumVal; 8383 EltTy = LastEnumConst->getType(); 8384 8385 // Check for overflow on increment. 8386 if (EnumVal < LastEnumConst->getInitVal()) { 8387 // C++0x [dcl.enum]p5: 8388 // If the underlying type is not fixed, the type of each enumerator 8389 // is the type of its initializing value: 8390 // 8391 // - Otherwise the type of the initializing value is the same as 8392 // the type of the initializing value of the preceding enumerator 8393 // unless the incremented value is not representable in that type, 8394 // in which case the type is an unspecified integral type 8395 // sufficient to contain the incremented value. If no such type 8396 // exists, the program is ill-formed. 8397 QualType T = getNextLargerIntegralType(Context, EltTy); 8398 if (T.isNull() || Enum->isFixed()) { 8399 // There is no integral type larger enough to represent this 8400 // value. Complain, then allow the value to wrap around. 8401 EnumVal = LastEnumConst->getInitVal(); 8402 EnumVal = EnumVal.zext(EnumVal.getBitWidth() * 2); 8403 ++EnumVal; 8404 if (Enum->isFixed()) 8405 // When the underlying type is fixed, this is ill-formed. 8406 Diag(IdLoc, diag::err_enumerator_wrapped) 8407 << EnumVal.toString(10) 8408 << EltTy; 8409 else 8410 Diag(IdLoc, diag::warn_enumerator_too_large) 8411 << EnumVal.toString(10); 8412 } else { 8413 EltTy = T; 8414 } 8415 8416 // Retrieve the last enumerator's value, extent that type to the 8417 // type that is supposed to be large enough to represent the incremented 8418 // value, then increment. 8419 EnumVal = LastEnumConst->getInitVal(); 8420 EnumVal.setIsSigned(EltTy->isSignedIntegerType()); 8421 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 8422 ++EnumVal; 8423 8424 // If we're not in C++, diagnose the overflow of enumerator values, 8425 // which in C99 means that the enumerator value is not representable in 8426 // an int (C99 6.7.2.2p2). However, we support GCC's extension that 8427 // permits enumerator values that are representable in some larger 8428 // integral type. 8429 if (!getLangOptions().CPlusPlus && !T.isNull()) 8430 Diag(IdLoc, diag::warn_enum_value_overflow); 8431 } else if (!getLangOptions().CPlusPlus && 8432 !isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 8433 // Enforce C99 6.7.2.2p2 even when we compute the next value. 8434 Diag(IdLoc, diag::ext_enum_value_not_int) 8435 << EnumVal.toString(10) << 1; 8436 } 8437 } 8438 } 8439 8440 if (!EltTy->isDependentType()) { 8441 // Make the enumerator value match the signedness and size of the 8442 // enumerator's type. 8443 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 8444 EnumVal.setIsSigned(EltTy->isSignedIntegerType()); 8445 } 8446 8447 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 8448 Val, EnumVal); 8449} 8450 8451 8452Decl *Sema::ActOnEnumConstant(Scope *S, Decl *theEnumDecl, Decl *lastEnumConst, 8453 SourceLocation IdLoc, IdentifierInfo *Id, 8454 AttributeList *Attr, 8455 SourceLocation EqualLoc, ExprTy *val) { 8456 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl); 8457 EnumConstantDecl *LastEnumConst = 8458 cast_or_null<EnumConstantDecl>(lastEnumConst); 8459 Expr *Val = static_cast<Expr*>(val); 8460 8461 // The scope passed in may not be a decl scope. Zip up the scope tree until 8462 // we find one that is. 8463 S = getNonFieldDeclScope(S); 8464 8465 // Verify that there isn't already something declared with this name in this 8466 // scope. 8467 NamedDecl *PrevDecl = LookupSingleName(S, Id, IdLoc, LookupOrdinaryName, 8468 ForRedeclaration); 8469 if (PrevDecl && PrevDecl->isTemplateParameter()) { 8470 // Maybe we will complain about the shadowed template parameter. 8471 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 8472 // Just pretend that we didn't see the previous declaration. 8473 PrevDecl = 0; 8474 } 8475 8476 if (PrevDecl) { 8477 // When in C++, we may get a TagDecl with the same name; in this case the 8478 // enum constant will 'hide' the tag. 8479 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 8480 "Received TagDecl when not in C++!"); 8481 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 8482 if (isa<EnumConstantDecl>(PrevDecl)) 8483 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 8484 else 8485 Diag(IdLoc, diag::err_redefinition) << Id; 8486 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 8487 return 0; 8488 } 8489 } 8490 8491 // C++ [class.mem]p13: 8492 // If T is the name of a class, then each of the following shall have a 8493 // name different from T: 8494 // - every enumerator of every member of class T that is an enumerated 8495 // type 8496 if (CXXRecordDecl *Record 8497 = dyn_cast<CXXRecordDecl>( 8498 TheEnumDecl->getDeclContext()->getRedeclContext())) 8499 if (Record->getIdentifier() && Record->getIdentifier() == Id) 8500 Diag(IdLoc, diag::err_member_name_of_class) << Id; 8501 8502 EnumConstantDecl *New = 8503 CheckEnumConstant(TheEnumDecl, LastEnumConst, IdLoc, Id, Val); 8504 8505 if (New) { 8506 // Process attributes. 8507 if (Attr) ProcessDeclAttributeList(S, New, Attr); 8508 8509 // Register this decl in the current scope stack. 8510 New->setAccess(TheEnumDecl->getAccess()); 8511 PushOnScopeChains(New, S); 8512 } 8513 8514 return New; 8515} 8516 8517void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc, 8518 SourceLocation RBraceLoc, Decl *EnumDeclX, 8519 Decl **Elements, unsigned NumElements, 8520 Scope *S, AttributeList *Attr) { 8521 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX); 8522 QualType EnumType = Context.getTypeDeclType(Enum); 8523 8524 if (Attr) 8525 ProcessDeclAttributeList(S, Enum, Attr); 8526 8527 if (Enum->isDependentType()) { 8528 for (unsigned i = 0; i != NumElements; ++i) { 8529 EnumConstantDecl *ECD = 8530 cast_or_null<EnumConstantDecl>(Elements[i]); 8531 if (!ECD) continue; 8532 8533 ECD->setType(EnumType); 8534 } 8535 8536 Enum->completeDefinition(Context.DependentTy, Context.DependentTy, 0, 0); 8537 return; 8538 } 8539 8540 // TODO: If the result value doesn't fit in an int, it must be a long or long 8541 // long value. ISO C does not support this, but GCC does as an extension, 8542 // emit a warning. 8543 unsigned IntWidth = Context.Target.getIntWidth(); 8544 unsigned CharWidth = Context.Target.getCharWidth(); 8545 unsigned ShortWidth = Context.Target.getShortWidth(); 8546 8547 // Verify that all the values are okay, compute the size of the values, and 8548 // reverse the list. 8549 unsigned NumNegativeBits = 0; 8550 unsigned NumPositiveBits = 0; 8551 8552 // Keep track of whether all elements have type int. 8553 bool AllElementsInt = true; 8554 8555 for (unsigned i = 0; i != NumElements; ++i) { 8556 EnumConstantDecl *ECD = 8557 cast_or_null<EnumConstantDecl>(Elements[i]); 8558 if (!ECD) continue; // Already issued a diagnostic. 8559 8560 const llvm::APSInt &InitVal = ECD->getInitVal(); 8561 8562 // Keep track of the size of positive and negative values. 8563 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 8564 NumPositiveBits = std::max(NumPositiveBits, 8565 (unsigned)InitVal.getActiveBits()); 8566 else 8567 NumNegativeBits = std::max(NumNegativeBits, 8568 (unsigned)InitVal.getMinSignedBits()); 8569 8570 // Keep track of whether every enum element has type int (very commmon). 8571 if (AllElementsInt) 8572 AllElementsInt = ECD->getType() == Context.IntTy; 8573 } 8574 8575 // Figure out the type that should be used for this enum. 8576 QualType BestType; 8577 unsigned BestWidth; 8578 8579 // C++0x N3000 [conv.prom]p3: 8580 // An rvalue of an unscoped enumeration type whose underlying 8581 // type is not fixed can be converted to an rvalue of the first 8582 // of the following types that can represent all the values of 8583 // the enumeration: int, unsigned int, long int, unsigned long 8584 // int, long long int, or unsigned long long int. 8585 // C99 6.4.4.3p2: 8586 // An identifier declared as an enumeration constant has type int. 8587 // The C99 rule is modified by a gcc extension 8588 QualType BestPromotionType; 8589 8590 bool Packed = Enum->getAttr<PackedAttr>() ? true : false; 8591 // -fshort-enums is the equivalent to specifying the packed attribute on all 8592 // enum definitions. 8593 if (LangOpts.ShortEnums) 8594 Packed = true; 8595 8596 if (Enum->isFixed()) { 8597 BestType = BestPromotionType = Enum->getIntegerType(); 8598 // We don't need to set BestWidth, because BestType is going to be the type 8599 // of the enumerators, but we do anyway because otherwise some compilers 8600 // warn that it might be used uninitialized. 8601 BestWidth = CharWidth; 8602 } 8603 else if (NumNegativeBits) { 8604 // If there is a negative value, figure out the smallest integer type (of 8605 // int/long/longlong) that fits. 8606 // If it's packed, check also if it fits a char or a short. 8607 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) { 8608 BestType = Context.SignedCharTy; 8609 BestWidth = CharWidth; 8610 } else if (Packed && NumNegativeBits <= ShortWidth && 8611 NumPositiveBits < ShortWidth) { 8612 BestType = Context.ShortTy; 8613 BestWidth = ShortWidth; 8614 } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 8615 BestType = Context.IntTy; 8616 BestWidth = IntWidth; 8617 } else { 8618 BestWidth = Context.Target.getLongWidth(); 8619 8620 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) { 8621 BestType = Context.LongTy; 8622 } else { 8623 BestWidth = Context.Target.getLongLongWidth(); 8624 8625 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 8626 Diag(Enum->getLocation(), diag::warn_enum_too_large); 8627 BestType = Context.LongLongTy; 8628 } 8629 } 8630 BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType); 8631 } else { 8632 // If there is no negative value, figure out the smallest type that fits 8633 // all of the enumerator values. 8634 // If it's packed, check also if it fits a char or a short. 8635 if (Packed && NumPositiveBits <= CharWidth) { 8636 BestType = Context.UnsignedCharTy; 8637 BestPromotionType = Context.IntTy; 8638 BestWidth = CharWidth; 8639 } else if (Packed && NumPositiveBits <= ShortWidth) { 8640 BestType = Context.UnsignedShortTy; 8641 BestPromotionType = Context.IntTy; 8642 BestWidth = ShortWidth; 8643 } else if (NumPositiveBits <= IntWidth) { 8644 BestType = Context.UnsignedIntTy; 8645 BestWidth = IntWidth; 8646 BestPromotionType 8647 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 8648 ? Context.UnsignedIntTy : Context.IntTy; 8649 } else if (NumPositiveBits <= 8650 (BestWidth = Context.Target.getLongWidth())) { 8651 BestType = Context.UnsignedLongTy; 8652 BestPromotionType 8653 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 8654 ? Context.UnsignedLongTy : Context.LongTy; 8655 } else { 8656 BestWidth = Context.Target.getLongLongWidth(); 8657 assert(NumPositiveBits <= BestWidth && 8658 "How could an initializer get larger than ULL?"); 8659 BestType = Context.UnsignedLongLongTy; 8660 BestPromotionType 8661 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 8662 ? Context.UnsignedLongLongTy : Context.LongLongTy; 8663 } 8664 } 8665 8666 // Loop over all of the enumerator constants, changing their types to match 8667 // the type of the enum if needed. 8668 for (unsigned i = 0; i != NumElements; ++i) { 8669 EnumConstantDecl *ECD = cast_or_null<EnumConstantDecl>(Elements[i]); 8670 if (!ECD) continue; // Already issued a diagnostic. 8671 8672 // Standard C says the enumerators have int type, but we allow, as an 8673 // extension, the enumerators to be larger than int size. If each 8674 // enumerator value fits in an int, type it as an int, otherwise type it the 8675 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 8676 // that X has type 'int', not 'unsigned'. 8677 8678 // Determine whether the value fits into an int. 8679 llvm::APSInt InitVal = ECD->getInitVal(); 8680 8681 // If it fits into an integer type, force it. Otherwise force it to match 8682 // the enum decl type. 8683 QualType NewTy; 8684 unsigned NewWidth; 8685 bool NewSign; 8686 if (!getLangOptions().CPlusPlus && 8687 isRepresentableIntegerValue(Context, InitVal, Context.IntTy)) { 8688 NewTy = Context.IntTy; 8689 NewWidth = IntWidth; 8690 NewSign = true; 8691 } else if (ECD->getType() == BestType) { 8692 // Already the right type! 8693 if (getLangOptions().CPlusPlus) 8694 // C++ [dcl.enum]p4: Following the closing brace of an 8695 // enum-specifier, each enumerator has the type of its 8696 // enumeration. 8697 ECD->setType(EnumType); 8698 continue; 8699 } else { 8700 NewTy = BestType; 8701 NewWidth = BestWidth; 8702 NewSign = BestType->isSignedIntegerType(); 8703 } 8704 8705 // Adjust the APSInt value. 8706 InitVal = InitVal.extOrTrunc(NewWidth); 8707 InitVal.setIsSigned(NewSign); 8708 ECD->setInitVal(InitVal); 8709 8710 // Adjust the Expr initializer and type. 8711 if (ECD->getInitExpr() && 8712 !Context.hasSameType(NewTy, ECD->getInitExpr()->getType())) 8713 ECD->setInitExpr(ImplicitCastExpr::Create(Context, NewTy, 8714 CK_IntegralCast, 8715 ECD->getInitExpr(), 8716 /*base paths*/ 0, 8717 VK_RValue)); 8718 if (getLangOptions().CPlusPlus) 8719 // C++ [dcl.enum]p4: Following the closing brace of an 8720 // enum-specifier, each enumerator has the type of its 8721 // enumeration. 8722 ECD->setType(EnumType); 8723 else 8724 ECD->setType(NewTy); 8725 } 8726 8727 Enum->completeDefinition(BestType, BestPromotionType, 8728 NumPositiveBits, NumNegativeBits); 8729} 8730 8731Decl *Sema::ActOnFileScopeAsmDecl(Expr *expr, 8732 SourceLocation StartLoc, 8733 SourceLocation EndLoc) { 8734 StringLiteral *AsmString = cast<StringLiteral>(expr); 8735 8736 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext, 8737 AsmString, StartLoc, 8738 EndLoc); 8739 CurContext->addDecl(New); 8740 return New; 8741} 8742 8743void Sema::ActOnPragmaWeakID(IdentifierInfo* Name, 8744 SourceLocation PragmaLoc, 8745 SourceLocation NameLoc) { 8746 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, LookupOrdinaryName); 8747 8748 if (PrevDecl) { 8749 PrevDecl->addAttr(::new (Context) WeakAttr(PragmaLoc, Context)); 8750 } else { 8751 (void)WeakUndeclaredIdentifiers.insert( 8752 std::pair<IdentifierInfo*,WeakInfo> 8753 (Name, WeakInfo((IdentifierInfo*)0, NameLoc))); 8754 } 8755} 8756 8757void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name, 8758 IdentifierInfo* AliasName, 8759 SourceLocation PragmaLoc, 8760 SourceLocation NameLoc, 8761 SourceLocation AliasNameLoc) { 8762 Decl *PrevDecl = LookupSingleName(TUScope, AliasName, AliasNameLoc, 8763 LookupOrdinaryName); 8764 WeakInfo W = WeakInfo(Name, NameLoc); 8765 8766 if (PrevDecl) { 8767 if (!PrevDecl->hasAttr<AliasAttr>()) 8768 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl)) 8769 DeclApplyPragmaWeak(TUScope, ND, W); 8770 } else { 8771 (void)WeakUndeclaredIdentifiers.insert( 8772 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W)); 8773 } 8774} 8775