SemaDecl.cpp revision ca63c200346c0ca9e00194ec6e34a5a7b0ed9321
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 case DeclSpec::TST_underlyingType: { 2869 // Grab the type from the parser. 2870 TypeSourceInfo *TSI = 0; 2871 QualType T = S.GetTypeFromParser(DS.getRepAsType(), &TSI); 2872 if (T.isNull() || !T->isDependentType()) break; 2873 2874 // Make sure there's a type source info. This isn't really much 2875 // of a waste; most dependent types should have type source info 2876 // attached already. 2877 if (!TSI) 2878 TSI = S.Context.getTrivialTypeSourceInfo(T, DS.getTypeSpecTypeLoc()); 2879 2880 // Rebuild the type in the current instantiation. 2881 TSI = S.RebuildTypeInCurrentInstantiation(TSI, D.getIdentifierLoc(), Name); 2882 if (!TSI) return true; 2883 2884 // Store the new type back in the decl spec. 2885 ParsedType LocType = S.CreateParsedType(TSI->getType(), TSI); 2886 DS.UpdateTypeRep(LocType); 2887 break; 2888 } 2889 2890 case DeclSpec::TST_typeofExpr: { 2891 Expr *E = DS.getRepAsExpr(); 2892 ExprResult Result = S.RebuildExprInCurrentInstantiation(E); 2893 if (Result.isInvalid()) return true; 2894 DS.UpdateExprRep(Result.get()); 2895 break; 2896 } 2897 2898 default: 2899 // Nothing to do for these decl specs. 2900 break; 2901 } 2902 2903 // It doesn't matter what order we do this in. 2904 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) { 2905 DeclaratorChunk &Chunk = D.getTypeObject(I); 2906 2907 // The only type information in the declarator which can come 2908 // before the declaration name is the base type of a member 2909 // pointer. 2910 if (Chunk.Kind != DeclaratorChunk::MemberPointer) 2911 continue; 2912 2913 // Rebuild the scope specifier in-place. 2914 CXXScopeSpec &SS = Chunk.Mem.Scope(); 2915 if (S.RebuildNestedNameSpecifierInCurrentInstantiation(SS)) 2916 return true; 2917 } 2918 2919 return false; 2920} 2921 2922Decl *Sema::ActOnDeclarator(Scope *S, Declarator &D, 2923 bool IsFunctionDefinition) { 2924 return HandleDeclarator(S, D, MultiTemplateParamsArg(*this), 2925 IsFunctionDefinition); 2926} 2927 2928/// DiagnoseClassNameShadow - Implement C++ [class.mem]p13: 2929/// If T is the name of a class, then each of the following shall have a 2930/// name different from T: 2931/// - every static data member of class T; 2932/// - every member function of class T 2933/// - every member of class T that is itself a type; 2934/// \returns true if the declaration name violates these rules. 2935bool Sema::DiagnoseClassNameShadow(DeclContext *DC, 2936 DeclarationNameInfo NameInfo) { 2937 DeclarationName Name = NameInfo.getName(); 2938 2939 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(DC)) 2940 if (Record->getIdentifier() && Record->getDeclName() == Name) { 2941 Diag(NameInfo.getLoc(), diag::err_member_name_of_class) << Name; 2942 return true; 2943 } 2944 2945 return false; 2946} 2947 2948Decl *Sema::HandleDeclarator(Scope *S, Declarator &D, 2949 MultiTemplateParamsArg TemplateParamLists, 2950 bool IsFunctionDefinition) { 2951 // TODO: consider using NameInfo for diagnostic. 2952 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 2953 DeclarationName Name = NameInfo.getName(); 2954 2955 // All of these full declarators require an identifier. If it doesn't have 2956 // one, the ParsedFreeStandingDeclSpec action should be used. 2957 if (!Name) { 2958 if (!D.isInvalidType()) // Reject this if we think it is valid. 2959 Diag(D.getDeclSpec().getSourceRange().getBegin(), 2960 diag::err_declarator_need_ident) 2961 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 2962 return 0; 2963 } else if (DiagnoseUnexpandedParameterPack(NameInfo, UPPC_DeclarationType)) 2964 return 0; 2965 2966 // The scope passed in may not be a decl scope. Zip up the scope tree until 2967 // we find one that is. 2968 while ((S->getFlags() & Scope::DeclScope) == 0 || 2969 (S->getFlags() & Scope::TemplateParamScope) != 0) 2970 S = S->getParent(); 2971 2972 DeclContext *DC = CurContext; 2973 if (D.getCXXScopeSpec().isInvalid()) 2974 D.setInvalidType(); 2975 else if (D.getCXXScopeSpec().isSet()) { 2976 if (DiagnoseUnexpandedParameterPack(D.getCXXScopeSpec(), 2977 UPPC_DeclarationQualifier)) 2978 return 0; 2979 2980 bool EnteringContext = !D.getDeclSpec().isFriendSpecified(); 2981 DC = computeDeclContext(D.getCXXScopeSpec(), EnteringContext); 2982 if (!DC) { 2983 // If we could not compute the declaration context, it's because the 2984 // declaration context is dependent but does not refer to a class, 2985 // class template, or class template partial specialization. Complain 2986 // and return early, to avoid the coming semantic disaster. 2987 Diag(D.getIdentifierLoc(), 2988 diag::err_template_qualified_declarator_no_match) 2989 << (NestedNameSpecifier*)D.getCXXScopeSpec().getScopeRep() 2990 << D.getCXXScopeSpec().getRange(); 2991 return 0; 2992 } 2993 bool IsDependentContext = DC->isDependentContext(); 2994 2995 if (!IsDependentContext && 2996 RequireCompleteDeclContext(D.getCXXScopeSpec(), DC)) 2997 return 0; 2998 2999 if (isa<CXXRecordDecl>(DC)) { 3000 if (!cast<CXXRecordDecl>(DC)->hasDefinition()) { 3001 Diag(D.getIdentifierLoc(), 3002 diag::err_member_def_undefined_record) 3003 << Name << DC << D.getCXXScopeSpec().getRange(); 3004 D.setInvalidType(); 3005 } else if (isa<CXXRecordDecl>(CurContext) && 3006 !D.getDeclSpec().isFriendSpecified()) { 3007 // The user provided a superfluous scope specifier inside a class 3008 // definition: 3009 // 3010 // class X { 3011 // void X::f(); 3012 // }; 3013 if (CurContext->Equals(DC)) 3014 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 3015 << Name << FixItHint::CreateRemoval(D.getCXXScopeSpec().getRange()); 3016 else 3017 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 3018 << Name << D.getCXXScopeSpec().getRange(); 3019 3020 // Pretend that this qualifier was not here. 3021 D.getCXXScopeSpec().clear(); 3022 } 3023 } 3024 3025 // Check whether we need to rebuild the type of the given 3026 // declaration in the current instantiation. 3027 if (EnteringContext && IsDependentContext && 3028 TemplateParamLists.size() != 0) { 3029 ContextRAII SavedContext(*this, DC); 3030 if (RebuildDeclaratorInCurrentInstantiation(*this, D, Name)) 3031 D.setInvalidType(); 3032 } 3033 } 3034 3035 if (DiagnoseClassNameShadow(DC, NameInfo)) 3036 // If this is a typedef, we'll end up spewing multiple diagnostics. 3037 // Just return early; it's safer. 3038 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3039 return 0; 3040 3041 NamedDecl *New; 3042 3043 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 3044 QualType R = TInfo->getType(); 3045 3046 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 3047 UPPC_DeclarationType)) 3048 D.setInvalidType(); 3049 3050 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 3051 ForRedeclaration); 3052 3053 // See if this is a redefinition of a variable in the same scope. 3054 if (!D.getCXXScopeSpec().isSet()) { 3055 bool IsLinkageLookup = false; 3056 3057 // If the declaration we're planning to build will be a function 3058 // or object with linkage, then look for another declaration with 3059 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 3060 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3061 /* Do nothing*/; 3062 else if (R->isFunctionType()) { 3063 if (CurContext->isFunctionOrMethod() || 3064 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3065 IsLinkageLookup = true; 3066 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 3067 IsLinkageLookup = true; 3068 else if (CurContext->getRedeclContext()->isTranslationUnit() && 3069 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3070 IsLinkageLookup = true; 3071 3072 if (IsLinkageLookup) 3073 Previous.clear(LookupRedeclarationWithLinkage); 3074 3075 LookupName(Previous, S, /* CreateBuiltins = */ IsLinkageLookup); 3076 } else { // Something like "int foo::x;" 3077 LookupQualifiedName(Previous, DC); 3078 3079 // Don't consider using declarations as previous declarations for 3080 // out-of-line members. 3081 RemoveUsingDecls(Previous); 3082 3083 // C++ 7.3.1.2p2: 3084 // Members (including explicit specializations of templates) of a named 3085 // namespace can also be defined outside that namespace by explicit 3086 // qualification of the name being defined, provided that the entity being 3087 // defined was already declared in the namespace and the definition appears 3088 // after the point of declaration in a namespace that encloses the 3089 // declarations namespace. 3090 // 3091 // Note that we only check the context at this point. We don't yet 3092 // have enough information to make sure that PrevDecl is actually 3093 // the declaration we want to match. For example, given: 3094 // 3095 // class X { 3096 // void f(); 3097 // void f(float); 3098 // }; 3099 // 3100 // void X::f(int) { } // ill-formed 3101 // 3102 // In this case, PrevDecl will point to the overload set 3103 // containing the two f's declared in X, but neither of them 3104 // matches. 3105 3106 // First check whether we named the global scope. 3107 if (isa<TranslationUnitDecl>(DC)) { 3108 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 3109 << Name << D.getCXXScopeSpec().getRange(); 3110 } else { 3111 DeclContext *Cur = CurContext; 3112 while (isa<LinkageSpecDecl>(Cur)) 3113 Cur = Cur->getParent(); 3114 if (!Cur->Encloses(DC)) { 3115 // The qualifying scope doesn't enclose the original declaration. 3116 // Emit diagnostic based on current scope. 3117 SourceLocation L = D.getIdentifierLoc(); 3118 SourceRange R = D.getCXXScopeSpec().getRange(); 3119 if (isa<FunctionDecl>(Cur)) 3120 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 3121 else 3122 Diag(L, diag::err_invalid_declarator_scope) 3123 << Name << cast<NamedDecl>(DC) << R; 3124 D.setInvalidType(); 3125 } 3126 } 3127 } 3128 3129 if (Previous.isSingleResult() && 3130 Previous.getFoundDecl()->isTemplateParameter()) { 3131 // Maybe we will complain about the shadowed template parameter. 3132 if (!D.isInvalidType()) 3133 if (DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), 3134 Previous.getFoundDecl())) 3135 D.setInvalidType(); 3136 3137 // Just pretend that we didn't see the previous declaration. 3138 Previous.clear(); 3139 } 3140 3141 // In C++, the previous declaration we find might be a tag type 3142 // (class or enum). In this case, the new declaration will hide the 3143 // tag type. Note that this does does not apply if we're declaring a 3144 // typedef (C++ [dcl.typedef]p4). 3145 if (Previous.isSingleTagDecl() && 3146 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 3147 Previous.clear(); 3148 3149 bool Redeclaration = false; 3150 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 3151 if (TemplateParamLists.size()) { 3152 Diag(D.getIdentifierLoc(), diag::err_template_typedef); 3153 return 0; 3154 } 3155 3156 New = ActOnTypedefDeclarator(S, D, DC, R, TInfo, Previous, Redeclaration); 3157 } else if (R->isFunctionType()) { 3158 New = ActOnFunctionDeclarator(S, D, DC, R, TInfo, Previous, 3159 move(TemplateParamLists), 3160 IsFunctionDefinition, Redeclaration); 3161 } else { 3162 New = ActOnVariableDeclarator(S, D, DC, R, TInfo, Previous, 3163 move(TemplateParamLists), 3164 Redeclaration); 3165 } 3166 3167 if (New == 0) 3168 return 0; 3169 3170 // If this has an identifier and is not an invalid redeclaration or 3171 // function template specialization, add it to the scope stack. 3172 if (New->getDeclName() && !(Redeclaration && New->isInvalidDecl())) 3173 PushOnScopeChains(New, S); 3174 3175 return New; 3176} 3177 3178/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 3179/// types into constant array types in certain situations which would otherwise 3180/// be errors (for GCC compatibility). 3181static QualType TryToFixInvalidVariablyModifiedType(QualType T, 3182 ASTContext &Context, 3183 bool &SizeIsNegative, 3184 llvm::APSInt &Oversized) { 3185 // This method tries to turn a variable array into a constant 3186 // array even when the size isn't an ICE. This is necessary 3187 // for compatibility with code that depends on gcc's buggy 3188 // constant expression folding, like struct {char x[(int)(char*)2];} 3189 SizeIsNegative = false; 3190 Oversized = 0; 3191 3192 if (T->isDependentType()) 3193 return QualType(); 3194 3195 QualifierCollector Qs; 3196 const Type *Ty = Qs.strip(T); 3197 3198 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) { 3199 QualType Pointee = PTy->getPointeeType(); 3200 QualType FixedType = 3201 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative, 3202 Oversized); 3203 if (FixedType.isNull()) return FixedType; 3204 FixedType = Context.getPointerType(FixedType); 3205 return Qs.apply(Context, FixedType); 3206 } 3207 if (const ParenType* PTy = dyn_cast<ParenType>(Ty)) { 3208 QualType Inner = PTy->getInnerType(); 3209 QualType FixedType = 3210 TryToFixInvalidVariablyModifiedType(Inner, Context, SizeIsNegative, 3211 Oversized); 3212 if (FixedType.isNull()) return FixedType; 3213 FixedType = Context.getParenType(FixedType); 3214 return Qs.apply(Context, FixedType); 3215 } 3216 3217 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 3218 if (!VLATy) 3219 return QualType(); 3220 // FIXME: We should probably handle this case 3221 if (VLATy->getElementType()->isVariablyModifiedType()) 3222 return QualType(); 3223 3224 Expr::EvalResult EvalResult; 3225 if (!VLATy->getSizeExpr() || 3226 !VLATy->getSizeExpr()->Evaluate(EvalResult, Context) || 3227 !EvalResult.Val.isInt()) 3228 return QualType(); 3229 3230 // Check whether the array size is negative. 3231 llvm::APSInt &Res = EvalResult.Val.getInt(); 3232 if (Res.isSigned() && Res.isNegative()) { 3233 SizeIsNegative = true; 3234 return QualType(); 3235 } 3236 3237 // Check whether the array is too large to be addressed. 3238 unsigned ActiveSizeBits 3239 = ConstantArrayType::getNumAddressingBits(Context, VLATy->getElementType(), 3240 Res); 3241 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) { 3242 Oversized = Res; 3243 return QualType(); 3244 } 3245 3246 return Context.getConstantArrayType(VLATy->getElementType(), 3247 Res, ArrayType::Normal, 0); 3248} 3249 3250/// \brief Register the given locally-scoped external C declaration so 3251/// that it can be found later for redeclarations 3252void 3253Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, 3254 const LookupResult &Previous, 3255 Scope *S) { 3256 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 3257 "Decl is not a locally-scoped decl!"); 3258 // Note that we have a locally-scoped external with this name. 3259 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 3260 3261 if (!Previous.isSingleResult()) 3262 return; 3263 3264 NamedDecl *PrevDecl = Previous.getFoundDecl(); 3265 3266 // If there was a previous declaration of this variable, it may be 3267 // in our identifier chain. Update the identifier chain with the new 3268 // declaration. 3269 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 3270 // The previous declaration was found on the identifer resolver 3271 // chain, so remove it from its scope. 3272 while (S && !S->isDeclScope(PrevDecl)) 3273 S = S->getParent(); 3274 3275 if (S) 3276 S->RemoveDecl(PrevDecl); 3277 } 3278} 3279 3280/// \brief Diagnose function specifiers on a declaration of an identifier that 3281/// does not identify a function. 3282void Sema::DiagnoseFunctionSpecifiers(Declarator& D) { 3283 // FIXME: We should probably indicate the identifier in question to avoid 3284 // confusion for constructs like "inline int a(), b;" 3285 if (D.getDeclSpec().isInlineSpecified()) 3286 Diag(D.getDeclSpec().getInlineSpecLoc(), 3287 diag::err_inline_non_function); 3288 3289 if (D.getDeclSpec().isVirtualSpecified()) 3290 Diag(D.getDeclSpec().getVirtualSpecLoc(), 3291 diag::err_virtual_non_function); 3292 3293 if (D.getDeclSpec().isExplicitSpecified()) 3294 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3295 diag::err_explicit_non_function); 3296} 3297 3298NamedDecl* 3299Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 3300 QualType R, TypeSourceInfo *TInfo, 3301 LookupResult &Previous, bool &Redeclaration) { 3302 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 3303 if (D.getCXXScopeSpec().isSet()) { 3304 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 3305 << D.getCXXScopeSpec().getRange(); 3306 D.setInvalidType(); 3307 // Pretend we didn't see the scope specifier. 3308 DC = CurContext; 3309 Previous.clear(); 3310 } 3311 3312 if (getLangOptions().CPlusPlus) { 3313 // Check that there are no default arguments (C++ only). 3314 CheckExtraCXXDefaultArguments(D); 3315 } 3316 3317 DiagnoseFunctionSpecifiers(D); 3318 3319 if (D.getDeclSpec().isThreadSpecified()) 3320 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 3321 3322 if (D.getName().Kind != UnqualifiedId::IK_Identifier) { 3323 Diag(D.getName().StartLocation, diag::err_typedef_not_identifier) 3324 << D.getName().getSourceRange(); 3325 return 0; 3326 } 3327 3328 TypedefDecl *NewTD = ParseTypedefDecl(S, D, R, TInfo); 3329 if (!NewTD) return 0; 3330 3331 // Handle attributes prior to checking for duplicates in MergeVarDecl 3332 ProcessDeclAttributes(S, NewTD, D); 3333 3334 CheckTypedefForVariablyModifiedType(S, NewTD); 3335 3336 return ActOnTypedefNameDecl(S, DC, NewTD, Previous, Redeclaration); 3337} 3338 3339void 3340Sema::CheckTypedefForVariablyModifiedType(Scope *S, TypedefNameDecl *NewTD) { 3341 // C99 6.7.7p2: If a typedef name specifies a variably modified type 3342 // then it shall have block scope. 3343 // Note that variably modified types must be fixed before merging the decl so 3344 // that redeclarations will match. 3345 QualType T = NewTD->getUnderlyingType(); 3346 if (T->isVariablyModifiedType()) { 3347 getCurFunction()->setHasBranchProtectedScope(); 3348 3349 if (S->getFnParent() == 0) { 3350 bool SizeIsNegative; 3351 llvm::APSInt Oversized; 3352 QualType FixedTy = 3353 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 3354 Oversized); 3355 if (!FixedTy.isNull()) { 3356 Diag(NewTD->getLocation(), diag::warn_illegal_constant_array_size); 3357 NewTD->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(FixedTy)); 3358 } else { 3359 if (SizeIsNegative) 3360 Diag(NewTD->getLocation(), diag::err_typecheck_negative_array_size); 3361 else if (T->isVariableArrayType()) 3362 Diag(NewTD->getLocation(), diag::err_vla_decl_in_file_scope); 3363 else if (Oversized.getBoolValue()) 3364 Diag(NewTD->getLocation(), diag::err_array_too_large) << Oversized.toString(10); 3365 else 3366 Diag(NewTD->getLocation(), diag::err_vm_decl_in_file_scope); 3367 NewTD->setInvalidDecl(); 3368 } 3369 } 3370 } 3371} 3372 3373 3374/// ActOnTypedefNameDecl - Perform semantic checking for a declaration which 3375/// declares a typedef-name, either using the 'typedef' type specifier or via 3376/// a C++0x [dcl.typedef]p2 alias-declaration: 'using T = A;'. 3377NamedDecl* 3378Sema::ActOnTypedefNameDecl(Scope *S, DeclContext *DC, TypedefNameDecl *NewTD, 3379 LookupResult &Previous, bool &Redeclaration) { 3380 // Merge the decl with the existing one if appropriate. If the decl is 3381 // in an outer scope, it isn't the same thing. 3382 FilterLookupForScope(Previous, DC, S, /*ConsiderLinkage*/ false, 3383 /*ExplicitInstantiationOrSpecialization=*/false); 3384 if (!Previous.empty()) { 3385 Redeclaration = true; 3386 MergeTypedefNameDecl(NewTD, Previous); 3387 } 3388 3389 // If this is the C FILE type, notify the AST context. 3390 if (IdentifierInfo *II = NewTD->getIdentifier()) 3391 if (!NewTD->isInvalidDecl() && 3392 NewTD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 3393 if (II->isStr("FILE")) 3394 Context.setFILEDecl(NewTD); 3395 else if (II->isStr("jmp_buf")) 3396 Context.setjmp_bufDecl(NewTD); 3397 else if (II->isStr("sigjmp_buf")) 3398 Context.setsigjmp_bufDecl(NewTD); 3399 else if (II->isStr("__builtin_va_list")) 3400 Context.setBuiltinVaListType(Context.getTypedefType(NewTD)); 3401 } 3402 3403 return NewTD; 3404} 3405 3406/// \brief Determines whether the given declaration is an out-of-scope 3407/// previous declaration. 3408/// 3409/// This routine should be invoked when name lookup has found a 3410/// previous declaration (PrevDecl) that is not in the scope where a 3411/// new declaration by the same name is being introduced. If the new 3412/// declaration occurs in a local scope, previous declarations with 3413/// linkage may still be considered previous declarations (C99 3414/// 6.2.2p4-5, C++ [basic.link]p6). 3415/// 3416/// \param PrevDecl the previous declaration found by name 3417/// lookup 3418/// 3419/// \param DC the context in which the new declaration is being 3420/// declared. 3421/// 3422/// \returns true if PrevDecl is an out-of-scope previous declaration 3423/// for a new delcaration with the same name. 3424static bool 3425isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 3426 ASTContext &Context) { 3427 if (!PrevDecl) 3428 return false; 3429 3430 if (!PrevDecl->hasLinkage()) 3431 return false; 3432 3433 if (Context.getLangOptions().CPlusPlus) { 3434 // C++ [basic.link]p6: 3435 // If there is a visible declaration of an entity with linkage 3436 // having the same name and type, ignoring entities declared 3437 // outside the innermost enclosing namespace scope, the block 3438 // scope declaration declares that same entity and receives the 3439 // linkage of the previous declaration. 3440 DeclContext *OuterContext = DC->getRedeclContext(); 3441 if (!OuterContext->isFunctionOrMethod()) 3442 // This rule only applies to block-scope declarations. 3443 return false; 3444 3445 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 3446 if (PrevOuterContext->isRecord()) 3447 // We found a member function: ignore it. 3448 return false; 3449 3450 // Find the innermost enclosing namespace for the new and 3451 // previous declarations. 3452 OuterContext = OuterContext->getEnclosingNamespaceContext(); 3453 PrevOuterContext = PrevOuterContext->getEnclosingNamespaceContext(); 3454 3455 // The previous declaration is in a different namespace, so it 3456 // isn't the same function. 3457 if (!OuterContext->Equals(PrevOuterContext)) 3458 return false; 3459 } 3460 3461 return true; 3462} 3463 3464static void SetNestedNameSpecifier(DeclaratorDecl *DD, Declarator &D) { 3465 CXXScopeSpec &SS = D.getCXXScopeSpec(); 3466 if (!SS.isSet()) return; 3467 DD->setQualifierInfo(SS.getWithLocInContext(DD->getASTContext())); 3468} 3469 3470NamedDecl* 3471Sema::ActOnVariableDeclarator(Scope *S, Declarator &D, DeclContext *DC, 3472 QualType R, TypeSourceInfo *TInfo, 3473 LookupResult &Previous, 3474 MultiTemplateParamsArg TemplateParamLists, 3475 bool &Redeclaration) { 3476 DeclarationName Name = GetNameForDeclarator(D).getName(); 3477 3478 // Check that there are no default arguments (C++ only). 3479 if (getLangOptions().CPlusPlus) 3480 CheckExtraCXXDefaultArguments(D); 3481 3482 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpec(); 3483 assert(SCSpec != DeclSpec::SCS_typedef && 3484 "Parser allowed 'typedef' as storage class VarDecl."); 3485 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 3486 if (SCSpec == DeclSpec::SCS_mutable) { 3487 // mutable can only appear on non-static class members, so it's always 3488 // an error here 3489 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 3490 D.setInvalidType(); 3491 SC = SC_None; 3492 } 3493 SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 3494 VarDecl::StorageClass SCAsWritten 3495 = StorageClassSpecToVarDeclStorageClass(SCSpec); 3496 3497 IdentifierInfo *II = Name.getAsIdentifierInfo(); 3498 if (!II) { 3499 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 3500 << Name.getAsString(); 3501 return 0; 3502 } 3503 3504 DiagnoseFunctionSpecifiers(D); 3505 3506 if (!DC->isRecord() && S->getFnParent() == 0) { 3507 // C99 6.9p2: The storage-class specifiers auto and register shall not 3508 // appear in the declaration specifiers in an external declaration. 3509 if (SC == SC_Auto || SC == SC_Register) { 3510 3511 // If this is a register variable with an asm label specified, then this 3512 // is a GNU extension. 3513 if (SC == SC_Register && D.getAsmLabel()) 3514 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register); 3515 else 3516 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 3517 D.setInvalidType(); 3518 } 3519 } 3520 3521 bool isExplicitSpecialization = false; 3522 VarDecl *NewVD; 3523 if (!getLangOptions().CPlusPlus) { 3524 NewVD = VarDecl::Create(Context, DC, D.getSourceRange().getBegin(), 3525 D.getIdentifierLoc(), II, 3526 R, TInfo, SC, SCAsWritten); 3527 3528 if (D.isInvalidType()) 3529 NewVD->setInvalidDecl(); 3530 } else { 3531 if (DC->isRecord() && !CurContext->isRecord()) { 3532 // This is an out-of-line definition of a static data member. 3533 if (SC == SC_Static) { 3534 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 3535 diag::err_static_out_of_line) 3536 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3537 } else if (SC == SC_None) 3538 SC = SC_Static; 3539 } 3540 if (SC == SC_Static) { 3541 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) { 3542 if (RD->isLocalClass()) 3543 Diag(D.getIdentifierLoc(), 3544 diag::err_static_data_member_not_allowed_in_local_class) 3545 << Name << RD->getDeclName(); 3546 3547 // C++ [class.union]p1: If a union contains a static data member, 3548 // the program is ill-formed. 3549 // 3550 // We also disallow static data members in anonymous structs. 3551 if (CurContext->isRecord() && (RD->isUnion() || !RD->getDeclName())) 3552 Diag(D.getIdentifierLoc(), 3553 diag::err_static_data_member_not_allowed_in_union_or_anon_struct) 3554 << Name << RD->isUnion(); 3555 } 3556 } 3557 3558 // Match up the template parameter lists with the scope specifier, then 3559 // determine whether we have a template or a template specialization. 3560 isExplicitSpecialization = false; 3561 bool Invalid = false; 3562 if (TemplateParameterList *TemplateParams 3563 = MatchTemplateParametersToScopeSpecifier( 3564 D.getDeclSpec().getSourceRange().getBegin(), 3565 D.getIdentifierLoc(), 3566 D.getCXXScopeSpec(), 3567 TemplateParamLists.get(), 3568 TemplateParamLists.size(), 3569 /*never a friend*/ false, 3570 isExplicitSpecialization, 3571 Invalid)) { 3572 if (TemplateParams->size() > 0) { 3573 // There is no such thing as a variable template. 3574 Diag(D.getIdentifierLoc(), diag::err_template_variable) 3575 << II 3576 << SourceRange(TemplateParams->getTemplateLoc(), 3577 TemplateParams->getRAngleLoc()); 3578 return 0; 3579 } else { 3580 // There is an extraneous 'template<>' for this variable. Complain 3581 // about it, but allow the declaration of the variable. 3582 Diag(TemplateParams->getTemplateLoc(), 3583 diag::err_template_variable_noparams) 3584 << II 3585 << SourceRange(TemplateParams->getTemplateLoc(), 3586 TemplateParams->getRAngleLoc()); 3587 } 3588 } 3589 3590 NewVD = VarDecl::Create(Context, DC, D.getSourceRange().getBegin(), 3591 D.getIdentifierLoc(), II, 3592 R, TInfo, SC, SCAsWritten); 3593 3594 // If this decl has an auto type in need of deduction, make a note of the 3595 // Decl so we can diagnose uses of it in its own initializer. 3596 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto && 3597 R->getContainedAutoType()) 3598 ParsingInitForAutoVars.insert(NewVD); 3599 3600 if (D.isInvalidType() || Invalid) 3601 NewVD->setInvalidDecl(); 3602 3603 SetNestedNameSpecifier(NewVD, D); 3604 3605 if (TemplateParamLists.size() > 0 && D.getCXXScopeSpec().isSet()) { 3606 NewVD->setTemplateParameterListsInfo(Context, 3607 TemplateParamLists.size(), 3608 TemplateParamLists.release()); 3609 } 3610 } 3611 3612 if (D.getDeclSpec().isThreadSpecified()) { 3613 if (NewVD->hasLocalStorage()) 3614 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global); 3615 else if (!Context.Target.isTLSSupported()) 3616 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported); 3617 else 3618 NewVD->setThreadSpecified(true); 3619 } 3620 3621 // Set the lexical context. If the declarator has a C++ scope specifier, the 3622 // lexical context will be different from the semantic context. 3623 NewVD->setLexicalDeclContext(CurContext); 3624 3625 // Handle attributes prior to checking for duplicates in MergeVarDecl 3626 ProcessDeclAttributes(S, NewVD, D); 3627 3628 // Handle GNU asm-label extension (encoded as an attribute). 3629 if (Expr *E = (Expr*)D.getAsmLabel()) { 3630 // The parser guarantees this is a string. 3631 StringLiteral *SE = cast<StringLiteral>(E); 3632 llvm::StringRef Label = SE->getString(); 3633 if (S->getFnParent() != 0) { 3634 switch (SC) { 3635 case SC_None: 3636 case SC_Auto: 3637 Diag(E->getExprLoc(), diag::warn_asm_label_on_auto_decl) << Label; 3638 break; 3639 case SC_Register: 3640 if (!Context.Target.isValidGCCRegisterName(Label)) 3641 Diag(E->getExprLoc(), diag::err_asm_unknown_register_name) << Label; 3642 break; 3643 case SC_Static: 3644 case SC_Extern: 3645 case SC_PrivateExtern: 3646 break; 3647 } 3648 } 3649 3650 NewVD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), 3651 Context, Label)); 3652 } 3653 3654 // Diagnose shadowed variables before filtering for scope. 3655 if (!D.getCXXScopeSpec().isSet()) 3656 CheckShadow(S, NewVD, Previous); 3657 3658 // Don't consider existing declarations that are in a different 3659 // scope and are out-of-semantic-context declarations (if the new 3660 // declaration has linkage). 3661 FilterLookupForScope(Previous, DC, S, NewVD->hasLinkage(), 3662 isExplicitSpecialization); 3663 3664 if (!getLangOptions().CPlusPlus) 3665 CheckVariableDeclaration(NewVD, Previous, Redeclaration); 3666 else { 3667 // Merge the decl with the existing one if appropriate. 3668 if (!Previous.empty()) { 3669 if (Previous.isSingleResult() && 3670 isa<FieldDecl>(Previous.getFoundDecl()) && 3671 D.getCXXScopeSpec().isSet()) { 3672 // The user tried to define a non-static data member 3673 // out-of-line (C++ [dcl.meaning]p1). 3674 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 3675 << D.getCXXScopeSpec().getRange(); 3676 Previous.clear(); 3677 NewVD->setInvalidDecl(); 3678 } 3679 } else if (D.getCXXScopeSpec().isSet()) { 3680 // No previous declaration in the qualifying scope. 3681 Diag(D.getIdentifierLoc(), diag::err_no_member) 3682 << Name << computeDeclContext(D.getCXXScopeSpec(), true) 3683 << D.getCXXScopeSpec().getRange(); 3684 NewVD->setInvalidDecl(); 3685 } 3686 3687 CheckVariableDeclaration(NewVD, Previous, Redeclaration); 3688 3689 // This is an explicit specialization of a static data member. Check it. 3690 if (isExplicitSpecialization && !NewVD->isInvalidDecl() && 3691 CheckMemberSpecialization(NewVD, Previous)) 3692 NewVD->setInvalidDecl(); 3693 } 3694 3695 // attributes declared post-definition are currently ignored 3696 // FIXME: This should be handled in attribute merging, not 3697 // here. 3698 if (Previous.isSingleResult()) { 3699 VarDecl *Def = dyn_cast<VarDecl>(Previous.getFoundDecl()); 3700 if (Def && (Def = Def->getDefinition()) && 3701 Def != NewVD && D.hasAttributes()) { 3702 Diag(NewVD->getLocation(), diag::warn_attribute_precede_definition); 3703 Diag(Def->getLocation(), diag::note_previous_definition); 3704 } 3705 } 3706 3707 // If this is a locally-scoped extern C variable, update the map of 3708 // such variables. 3709 if (CurContext->isFunctionOrMethod() && NewVD->isExternC() && 3710 !NewVD->isInvalidDecl()) 3711 RegisterLocallyScopedExternCDecl(NewVD, Previous, S); 3712 3713 // If there's a #pragma GCC visibility in scope, and this isn't a class 3714 // member, set the visibility of this variable. 3715 if (NewVD->getLinkage() == ExternalLinkage && !DC->isRecord()) 3716 AddPushedVisibilityAttribute(NewVD); 3717 3718 MarkUnusedFileScopedDecl(NewVD); 3719 3720 return NewVD; 3721} 3722 3723/// \brief Diagnose variable or built-in function shadowing. Implements 3724/// -Wshadow. 3725/// 3726/// This method is called whenever a VarDecl is added to a "useful" 3727/// scope. 3728/// 3729/// \param S the scope in which the shadowing name is being declared 3730/// \param R the lookup of the name 3731/// 3732void Sema::CheckShadow(Scope *S, VarDecl *D, const LookupResult& R) { 3733 // Return if warning is ignored. 3734 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, R.getNameLoc()) == 3735 Diagnostic::Ignored) 3736 return; 3737 3738 // Don't diagnose declarations at file scope. 3739 if (D->hasGlobalStorage()) 3740 return; 3741 3742 DeclContext *NewDC = D->getDeclContext(); 3743 3744 // Only diagnose if we're shadowing an unambiguous field or variable. 3745 if (R.getResultKind() != LookupResult::Found) 3746 return; 3747 3748 NamedDecl* ShadowedDecl = R.getFoundDecl(); 3749 if (!isa<VarDecl>(ShadowedDecl) && !isa<FieldDecl>(ShadowedDecl)) 3750 return; 3751 3752 // Fields are not shadowed by variables in C++ static methods. 3753 if (isa<FieldDecl>(ShadowedDecl)) 3754 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewDC)) 3755 if (MD->isStatic()) 3756 return; 3757 3758 if (VarDecl *shadowedVar = dyn_cast<VarDecl>(ShadowedDecl)) 3759 if (shadowedVar->isExternC()) { 3760 // For shadowing external vars, make sure that we point to the global 3761 // declaration, not a locally scoped extern declaration. 3762 for (VarDecl::redecl_iterator 3763 I = shadowedVar->redecls_begin(), E = shadowedVar->redecls_end(); 3764 I != E; ++I) 3765 if (I->isFileVarDecl()) { 3766 ShadowedDecl = *I; 3767 break; 3768 } 3769 } 3770 3771 DeclContext *OldDC = ShadowedDecl->getDeclContext(); 3772 3773 // Only warn about certain kinds of shadowing for class members. 3774 if (NewDC && NewDC->isRecord()) { 3775 // In particular, don't warn about shadowing non-class members. 3776 if (!OldDC->isRecord()) 3777 return; 3778 3779 // TODO: should we warn about static data members shadowing 3780 // static data members from base classes? 3781 3782 // TODO: don't diagnose for inaccessible shadowed members. 3783 // This is hard to do perfectly because we might friend the 3784 // shadowing context, but that's just a false negative. 3785 } 3786 3787 // Determine what kind of declaration we're shadowing. 3788 unsigned Kind; 3789 if (isa<RecordDecl>(OldDC)) { 3790 if (isa<FieldDecl>(ShadowedDecl)) 3791 Kind = 3; // field 3792 else 3793 Kind = 2; // static data member 3794 } else if (OldDC->isFileContext()) 3795 Kind = 1; // global 3796 else 3797 Kind = 0; // local 3798 3799 DeclarationName Name = R.getLookupName(); 3800 3801 // Emit warning and note. 3802 Diag(R.getNameLoc(), diag::warn_decl_shadow) << Name << Kind << OldDC; 3803 Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration); 3804} 3805 3806/// \brief Check -Wshadow without the advantage of a previous lookup. 3807void Sema::CheckShadow(Scope *S, VarDecl *D) { 3808 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, D->getLocation()) == 3809 Diagnostic::Ignored) 3810 return; 3811 3812 LookupResult R(*this, D->getDeclName(), D->getLocation(), 3813 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 3814 LookupName(R, S); 3815 CheckShadow(S, D, R); 3816} 3817 3818/// \brief Perform semantic checking on a newly-created variable 3819/// declaration. 3820/// 3821/// This routine performs all of the type-checking required for a 3822/// variable declaration once it has been built. It is used both to 3823/// check variables after they have been parsed and their declarators 3824/// have been translated into a declaration, and to check variables 3825/// that have been instantiated from a template. 3826/// 3827/// Sets NewVD->isInvalidDecl() if an error was encountered. 3828void Sema::CheckVariableDeclaration(VarDecl *NewVD, 3829 LookupResult &Previous, 3830 bool &Redeclaration) { 3831 // If the decl is already known invalid, don't check it. 3832 if (NewVD->isInvalidDecl()) 3833 return; 3834 3835 QualType T = NewVD->getType(); 3836 3837 if (T->isObjCObjectType()) { 3838 Diag(NewVD->getLocation(), diag::err_statically_allocated_object); 3839 return NewVD->setInvalidDecl(); 3840 } 3841 3842 // Emit an error if an address space was applied to decl with local storage. 3843 // This includes arrays of objects with address space qualifiers, but not 3844 // automatic variables that point to other address spaces. 3845 // ISO/IEC TR 18037 S5.1.2 3846 if (NewVD->hasLocalStorage() && T.getAddressSpace() != 0) { 3847 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 3848 return NewVD->setInvalidDecl(); 3849 } 3850 3851 if (NewVD->hasLocalStorage() && T.isObjCGCWeak() 3852 && !NewVD->hasAttr<BlocksAttr>()) 3853 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 3854 3855 bool isVM = T->isVariablyModifiedType(); 3856 if (isVM || NewVD->hasAttr<CleanupAttr>() || 3857 NewVD->hasAttr<BlocksAttr>()) 3858 getCurFunction()->setHasBranchProtectedScope(); 3859 3860 if ((isVM && NewVD->hasLinkage()) || 3861 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { 3862 bool SizeIsNegative; 3863 llvm::APSInt Oversized; 3864 QualType FixedTy = 3865 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 3866 Oversized); 3867 3868 if (FixedTy.isNull() && T->isVariableArrayType()) { 3869 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 3870 // FIXME: This won't give the correct result for 3871 // int a[10][n]; 3872 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 3873 3874 if (NewVD->isFileVarDecl()) 3875 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 3876 << SizeRange; 3877 else if (NewVD->getStorageClass() == SC_Static) 3878 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 3879 << SizeRange; 3880 else 3881 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 3882 << SizeRange; 3883 return NewVD->setInvalidDecl(); 3884 } 3885 3886 if (FixedTy.isNull()) { 3887 if (NewVD->isFileVarDecl()) 3888 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 3889 else 3890 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 3891 return NewVD->setInvalidDecl(); 3892 } 3893 3894 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 3895 NewVD->setType(FixedTy); 3896 } 3897 3898 if (Previous.empty() && NewVD->isExternC()) { 3899 // Since we did not find anything by this name and we're declaring 3900 // an extern "C" variable, look for a non-visible extern "C" 3901 // declaration with the same name. 3902 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3903 = LocallyScopedExternalDecls.find(NewVD->getDeclName()); 3904 if (Pos != LocallyScopedExternalDecls.end()) 3905 Previous.addDecl(Pos->second); 3906 } 3907 3908 if (T->isVoidType() && !NewVD->hasExternalStorage()) { 3909 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 3910 << T; 3911 return NewVD->setInvalidDecl(); 3912 } 3913 3914 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { 3915 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); 3916 return NewVD->setInvalidDecl(); 3917 } 3918 3919 if (isVM && NewVD->hasAttr<BlocksAttr>()) { 3920 Diag(NewVD->getLocation(), diag::err_block_on_vm); 3921 return NewVD->setInvalidDecl(); 3922 } 3923 3924 // Function pointers and references cannot have qualified function type, only 3925 // function pointer-to-members can do that. 3926 QualType Pointee; 3927 unsigned PtrOrRef = 0; 3928 if (const PointerType *Ptr = T->getAs<PointerType>()) 3929 Pointee = Ptr->getPointeeType(); 3930 else if (const ReferenceType *Ref = T->getAs<ReferenceType>()) { 3931 Pointee = Ref->getPointeeType(); 3932 PtrOrRef = 1; 3933 } 3934 if (!Pointee.isNull() && Pointee->isFunctionProtoType() && 3935 Pointee->getAs<FunctionProtoType>()->getTypeQuals() != 0) { 3936 Diag(NewVD->getLocation(), diag::err_invalid_qualified_function_pointer) 3937 << PtrOrRef; 3938 return NewVD->setInvalidDecl(); 3939 } 3940 3941 if (!Previous.empty()) { 3942 Redeclaration = true; 3943 MergeVarDecl(NewVD, Previous); 3944 } 3945} 3946 3947/// \brief Data used with FindOverriddenMethod 3948struct FindOverriddenMethodData { 3949 Sema *S; 3950 CXXMethodDecl *Method; 3951}; 3952 3953/// \brief Member lookup function that determines whether a given C++ 3954/// method overrides a method in a base class, to be used with 3955/// CXXRecordDecl::lookupInBases(). 3956static bool FindOverriddenMethod(const CXXBaseSpecifier *Specifier, 3957 CXXBasePath &Path, 3958 void *UserData) { 3959 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 3960 3961 FindOverriddenMethodData *Data 3962 = reinterpret_cast<FindOverriddenMethodData*>(UserData); 3963 3964 DeclarationName Name = Data->Method->getDeclName(); 3965 3966 // FIXME: Do we care about other names here too? 3967 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 3968 // We really want to find the base class destructor here. 3969 QualType T = Data->S->Context.getTypeDeclType(BaseRecord); 3970 CanQualType CT = Data->S->Context.getCanonicalType(T); 3971 3972 Name = Data->S->Context.DeclarationNames.getCXXDestructorName(CT); 3973 } 3974 3975 for (Path.Decls = BaseRecord->lookup(Name); 3976 Path.Decls.first != Path.Decls.second; 3977 ++Path.Decls.first) { 3978 NamedDecl *D = *Path.Decls.first; 3979 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 3980 if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD, false)) 3981 return true; 3982 } 3983 } 3984 3985 return false; 3986} 3987 3988/// AddOverriddenMethods - See if a method overrides any in the base classes, 3989/// and if so, check that it's a valid override and remember it. 3990bool Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 3991 // Look for virtual methods in base classes that this method might override. 3992 CXXBasePaths Paths; 3993 FindOverriddenMethodData Data; 3994 Data.Method = MD; 3995 Data.S = this; 3996 bool AddedAny = false; 3997 if (DC->lookupInBases(&FindOverriddenMethod, &Data, Paths)) { 3998 for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(), 3999 E = Paths.found_decls_end(); I != E; ++I) { 4000 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) { 4001 if (!CheckOverridingFunctionReturnType(MD, OldMD) && 4002 !CheckOverridingFunctionExceptionSpec(MD, OldMD) && 4003 !CheckIfOverriddenFunctionIsMarkedFinal(MD, OldMD)) { 4004 MD->addOverriddenMethod(OldMD->getCanonicalDecl()); 4005 AddedAny = true; 4006 } 4007 } 4008 } 4009 } 4010 4011 return AddedAny; 4012} 4013 4014static void DiagnoseInvalidRedeclaration(Sema &S, FunctionDecl *NewFD) { 4015 LookupResult Prev(S, NewFD->getDeclName(), NewFD->getLocation(), 4016 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4017 S.LookupQualifiedName(Prev, NewFD->getDeclContext()); 4018 assert(!Prev.isAmbiguous() && 4019 "Cannot have an ambiguity in previous-declaration lookup"); 4020 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 4021 Func != FuncEnd; ++Func) { 4022 if (isa<FunctionDecl>(*Func) && 4023 isNearlyMatchingFunction(S.Context, cast<FunctionDecl>(*Func), NewFD)) 4024 S.Diag((*Func)->getLocation(), diag::note_member_def_close_match); 4025 } 4026} 4027 4028NamedDecl* 4029Sema::ActOnFunctionDeclarator(Scope* S, Declarator& D, DeclContext* DC, 4030 QualType R, TypeSourceInfo *TInfo, 4031 LookupResult &Previous, 4032 MultiTemplateParamsArg TemplateParamLists, 4033 bool IsFunctionDefinition, bool &Redeclaration) { 4034 assert(R.getTypePtr()->isFunctionType()); 4035 4036 // TODO: consider using NameInfo for diagnostic. 4037 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 4038 DeclarationName Name = NameInfo.getName(); 4039 FunctionDecl::StorageClass SC = SC_None; 4040 switch (D.getDeclSpec().getStorageClassSpec()) { 4041 default: assert(0 && "Unknown storage class!"); 4042 case DeclSpec::SCS_auto: 4043 case DeclSpec::SCS_register: 4044 case DeclSpec::SCS_mutable: 4045 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4046 diag::err_typecheck_sclass_func); 4047 D.setInvalidType(); 4048 break; 4049 case DeclSpec::SCS_unspecified: SC = SC_None; break; 4050 case DeclSpec::SCS_extern: SC = SC_Extern; break; 4051 case DeclSpec::SCS_static: { 4052 if (CurContext->getRedeclContext()->isFunctionOrMethod()) { 4053 // C99 6.7.1p5: 4054 // The declaration of an identifier for a function that has 4055 // block scope shall have no explicit storage-class specifier 4056 // other than extern 4057 // See also (C++ [dcl.stc]p4). 4058 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4059 diag::err_static_block_func); 4060 SC = SC_None; 4061 } else 4062 SC = SC_Static; 4063 break; 4064 } 4065 case DeclSpec::SCS_private_extern: SC = SC_PrivateExtern; break; 4066 } 4067 4068 if (D.getDeclSpec().isThreadSpecified()) 4069 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 4070 4071 // Do not allow returning a objc interface by-value. 4072 if (R->getAs<FunctionType>()->getResultType()->isObjCObjectType()) { 4073 Diag(D.getIdentifierLoc(), 4074 diag::err_object_cannot_be_passed_returned_by_value) << 0 4075 << R->getAs<FunctionType>()->getResultType(); 4076 D.setInvalidType(); 4077 } 4078 4079 FunctionDecl *NewFD; 4080 bool isInline = D.getDeclSpec().isInlineSpecified(); 4081 bool isFriend = false; 4082 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 4083 FunctionDecl::StorageClass SCAsWritten 4084 = StorageClassSpecToFunctionDeclStorageClass(SCSpec); 4085 FunctionTemplateDecl *FunctionTemplate = 0; 4086 bool isExplicitSpecialization = false; 4087 bool isFunctionTemplateSpecialization = false; 4088 4089 if (!getLangOptions().CPlusPlus) { 4090 // Determine whether the function was written with a 4091 // prototype. This true when: 4092 // - there is a prototype in the declarator, or 4093 // - the type R of the function is some kind of typedef or other reference 4094 // to a type name (which eventually refers to a function type). 4095 bool HasPrototype = 4096 (D.isFunctionDeclarator() && D.getFunctionTypeInfo().hasPrototype) || 4097 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 4098 4099 NewFD = FunctionDecl::Create(Context, DC, D.getSourceRange().getBegin(), 4100 NameInfo, R, TInfo, SC, SCAsWritten, isInline, 4101 HasPrototype); 4102 if (D.isInvalidType()) 4103 NewFD->setInvalidDecl(); 4104 4105 // Set the lexical context. 4106 NewFD->setLexicalDeclContext(CurContext); 4107 // Filter out previous declarations that don't match the scope. 4108 FilterLookupForScope(Previous, DC, S, NewFD->hasLinkage(), 4109 /*ExplicitInstantiationOrSpecialization=*/false); 4110 } else { 4111 isFriend = D.getDeclSpec().isFriendSpecified(); 4112 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 4113 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 4114 bool isVirtualOkay = false; 4115 4116 // Check that the return type is not an abstract class type. 4117 // For record types, this is done by the AbstractClassUsageDiagnoser once 4118 // the class has been completely parsed. 4119 if (!DC->isRecord() && 4120 RequireNonAbstractType(D.getIdentifierLoc(), 4121 R->getAs<FunctionType>()->getResultType(), 4122 diag::err_abstract_type_in_decl, 4123 AbstractReturnType)) 4124 D.setInvalidType(); 4125 4126 if (Name.getNameKind() == DeclarationName::CXXConstructorName) { 4127 // This is a C++ constructor declaration. 4128 assert(DC->isRecord() && 4129 "Constructors can only be declared in a member context"); 4130 4131 R = CheckConstructorDeclarator(D, R, SC); 4132 4133 // Create the new declaration 4134 CXXConstructorDecl *NewCD = CXXConstructorDecl::Create( 4135 Context, 4136 cast<CXXRecordDecl>(DC), 4137 D.getSourceRange().getBegin(), 4138 NameInfo, R, TInfo, 4139 isExplicit, isInline, 4140 /*isImplicitlyDeclared=*/false); 4141 4142 NewFD = NewCD; 4143 } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4144 // This is a C++ destructor declaration. 4145 if (DC->isRecord()) { 4146 R = CheckDestructorDeclarator(D, R, SC); 4147 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 4148 4149 CXXDestructorDecl *NewDD = CXXDestructorDecl::Create(Context, Record, 4150 D.getSourceRange().getBegin(), 4151 NameInfo, R, TInfo, 4152 isInline, 4153 /*isImplicitlyDeclared=*/false); 4154 NewFD = NewDD; 4155 isVirtualOkay = true; 4156 4157 // If the class is complete, then we now create the implicit exception 4158 // specification. If the class is incomplete or dependent, we can't do 4159 // it yet. 4160 if (getLangOptions().CPlusPlus0x && !Record->isDependentType() && 4161 Record->getDefinition() && !Record->isBeingDefined() && 4162 R->getAs<FunctionProtoType>()->getExceptionSpecType() == EST_None) { 4163 AdjustDestructorExceptionSpec(Record, NewDD); 4164 } 4165 4166 } else { 4167 Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 4168 4169 // Create a FunctionDecl to satisfy the function definition parsing 4170 // code path. 4171 NewFD = FunctionDecl::Create(Context, DC, D.getSourceRange().getBegin(), 4172 D.getIdentifierLoc(), Name, R, TInfo, 4173 SC, SCAsWritten, isInline, 4174 /*hasPrototype=*/true); 4175 D.setInvalidType(); 4176 } 4177 } else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) { 4178 if (!DC->isRecord()) { 4179 Diag(D.getIdentifierLoc(), 4180 diag::err_conv_function_not_member); 4181 return 0; 4182 } 4183 4184 CheckConversionDeclarator(D, R, SC); 4185 NewFD = CXXConversionDecl::Create(Context, cast<CXXRecordDecl>(DC), 4186 D.getSourceRange().getBegin(), 4187 NameInfo, R, TInfo, 4188 isInline, isExplicit, 4189 SourceLocation()); 4190 4191 isVirtualOkay = true; 4192 } else if (DC->isRecord()) { 4193 // If the of the function is the same as the name of the record, then this 4194 // must be an invalid constructor that has a return type. 4195 // (The parser checks for a return type and makes the declarator a 4196 // constructor if it has no return type). 4197 // must have an invalid constructor that has a return type 4198 if (Name.getAsIdentifierInfo() && 4199 Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ 4200 Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 4201 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 4202 << SourceRange(D.getIdentifierLoc()); 4203 return 0; 4204 } 4205 4206 bool isStatic = SC == SC_Static; 4207 4208 // [class.free]p1: 4209 // Any allocation function for a class T is a static member 4210 // (even if not explicitly declared static). 4211 if (Name.getCXXOverloadedOperator() == OO_New || 4212 Name.getCXXOverloadedOperator() == OO_Array_New) 4213 isStatic = true; 4214 4215 // [class.free]p6 Any deallocation function for a class X is a static member 4216 // (even if not explicitly declared static). 4217 if (Name.getCXXOverloadedOperator() == OO_Delete || 4218 Name.getCXXOverloadedOperator() == OO_Array_Delete) 4219 isStatic = true; 4220 4221 // This is a C++ method declaration. 4222 CXXMethodDecl *NewMD = CXXMethodDecl::Create( 4223 Context, cast<CXXRecordDecl>(DC), 4224 D.getSourceRange().getBegin(), 4225 NameInfo, R, TInfo, 4226 isStatic, SCAsWritten, isInline, 4227 SourceLocation()); 4228 NewFD = NewMD; 4229 4230 isVirtualOkay = !isStatic; 4231 } else { 4232 // Determine whether the function was written with a 4233 // prototype. This true when: 4234 // - we're in C++ (where every function has a prototype), 4235 NewFD = FunctionDecl::Create(Context, DC, D.getSourceRange().getBegin(), 4236 NameInfo, R, TInfo, SC, SCAsWritten, isInline, 4237 true/*HasPrototype*/); 4238 } 4239 4240 if (isFriend && !isInline && IsFunctionDefinition) { 4241 // C++ [class.friend]p5 4242 // A function can be defined in a friend declaration of a 4243 // class . . . . Such a function is implicitly inline. 4244 NewFD->setImplicitlyInline(); 4245 } 4246 4247 SetNestedNameSpecifier(NewFD, D); 4248 isExplicitSpecialization = false; 4249 isFunctionTemplateSpecialization = false; 4250 if (D.isInvalidType()) 4251 NewFD->setInvalidDecl(); 4252 4253 // Set the lexical context. If the declarator has a C++ 4254 // scope specifier, or is the object of a friend declaration, the 4255 // lexical context will be different from the semantic context. 4256 NewFD->setLexicalDeclContext(CurContext); 4257 4258 // Match up the template parameter lists with the scope specifier, then 4259 // determine whether we have a template or a template specialization. 4260 bool Invalid = false; 4261 if (TemplateParameterList *TemplateParams 4262 = MatchTemplateParametersToScopeSpecifier( 4263 D.getDeclSpec().getSourceRange().getBegin(), 4264 D.getIdentifierLoc(), 4265 D.getCXXScopeSpec(), 4266 TemplateParamLists.get(), 4267 TemplateParamLists.size(), 4268 isFriend, 4269 isExplicitSpecialization, 4270 Invalid)) { 4271 if (TemplateParams->size() > 0) { 4272 // This is a function template 4273 4274 // Check that we can declare a template here. 4275 if (CheckTemplateDeclScope(S, TemplateParams)) 4276 return 0; 4277 4278 // A destructor cannot be a template. 4279 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4280 Diag(NewFD->getLocation(), diag::err_destructor_template); 4281 return 0; 4282 } 4283 4284 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC, 4285 NewFD->getLocation(), 4286 Name, TemplateParams, 4287 NewFD); 4288 FunctionTemplate->setLexicalDeclContext(CurContext); 4289 NewFD->setDescribedFunctionTemplate(FunctionTemplate); 4290 4291 // For source fidelity, store the other template param lists. 4292 if (TemplateParamLists.size() > 1) { 4293 NewFD->setTemplateParameterListsInfo(Context, 4294 TemplateParamLists.size() - 1, 4295 TemplateParamLists.release()); 4296 } 4297 } else { 4298 // This is a function template specialization. 4299 isFunctionTemplateSpecialization = true; 4300 // For source fidelity, store all the template param lists. 4301 NewFD->setTemplateParameterListsInfo(Context, 4302 TemplateParamLists.size(), 4303 TemplateParamLists.release()); 4304 4305 // C++0x [temp.expl.spec]p20 forbids "template<> friend void foo(int);". 4306 if (isFriend) { 4307 // We want to remove the "template<>", found here. 4308 SourceRange RemoveRange = TemplateParams->getSourceRange(); 4309 4310 // If we remove the template<> and the name is not a 4311 // template-id, we're actually silently creating a problem: 4312 // the friend declaration will refer to an untemplated decl, 4313 // and clearly the user wants a template specialization. So 4314 // we need to insert '<>' after the name. 4315 SourceLocation InsertLoc; 4316 if (D.getName().getKind() != UnqualifiedId::IK_TemplateId) { 4317 InsertLoc = D.getName().getSourceRange().getEnd(); 4318 InsertLoc = PP.getLocForEndOfToken(InsertLoc); 4319 } 4320 4321 Diag(D.getIdentifierLoc(), diag::err_template_spec_decl_friend) 4322 << Name << RemoveRange 4323 << FixItHint::CreateRemoval(RemoveRange) 4324 << FixItHint::CreateInsertion(InsertLoc, "<>"); 4325 } 4326 } 4327 } 4328 else { 4329 // All template param lists were matched against the scope specifier: 4330 // this is NOT (an explicit specialization of) a template. 4331 if (TemplateParamLists.size() > 0) 4332 // For source fidelity, store all the template param lists. 4333 NewFD->setTemplateParameterListsInfo(Context, 4334 TemplateParamLists.size(), 4335 TemplateParamLists.release()); 4336 } 4337 4338 if (Invalid) { 4339 NewFD->setInvalidDecl(); 4340 if (FunctionTemplate) 4341 FunctionTemplate->setInvalidDecl(); 4342 } 4343 4344 // C++ [dcl.fct.spec]p5: 4345 // The virtual specifier shall only be used in declarations of 4346 // nonstatic class member functions that appear within a 4347 // member-specification of a class declaration; see 10.3. 4348 // 4349 if (isVirtual && !NewFD->isInvalidDecl()) { 4350 if (!isVirtualOkay) { 4351 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4352 diag::err_virtual_non_function); 4353 } else if (!CurContext->isRecord()) { 4354 // 'virtual' was specified outside of the class. 4355 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4356 diag::err_virtual_out_of_class) 4357 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 4358 } else if (NewFD->getDescribedFunctionTemplate()) { 4359 // C++ [temp.mem]p3: 4360 // A member function template shall not be virtual. 4361 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4362 diag::err_virtual_member_function_template) 4363 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 4364 } else { 4365 // Okay: Add virtual to the method. 4366 NewFD->setVirtualAsWritten(true); 4367 } 4368 } 4369 4370 // C++ [dcl.fct.spec]p3: 4371 // The inline specifier shall not appear on a block scope function declaration. 4372 if (isInline && !NewFD->isInvalidDecl()) { 4373 if (CurContext->isFunctionOrMethod()) { 4374 // 'inline' is not allowed on block scope function declaration. 4375 Diag(D.getDeclSpec().getInlineSpecLoc(), 4376 diag::err_inline_declaration_block_scope) << Name 4377 << FixItHint::CreateRemoval(D.getDeclSpec().getInlineSpecLoc()); 4378 } 4379 } 4380 4381 // C++ [dcl.fct.spec]p6: 4382 // The explicit specifier shall be used only in the declaration of a 4383 // constructor or conversion function within its class definition; see 12.3.1 4384 // and 12.3.2. 4385 if (isExplicit && !NewFD->isInvalidDecl()) { 4386 if (!CurContext->isRecord()) { 4387 // 'explicit' was specified outside of the class. 4388 Diag(D.getDeclSpec().getExplicitSpecLoc(), 4389 diag::err_explicit_out_of_class) 4390 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 4391 } else if (!isa<CXXConstructorDecl>(NewFD) && 4392 !isa<CXXConversionDecl>(NewFD)) { 4393 // 'explicit' was specified on a function that wasn't a constructor 4394 // or conversion function. 4395 Diag(D.getDeclSpec().getExplicitSpecLoc(), 4396 diag::err_explicit_non_ctor_or_conv_function) 4397 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 4398 } 4399 } 4400 4401 // Filter out previous declarations that don't match the scope. 4402 FilterLookupForScope(Previous, DC, S, NewFD->hasLinkage(), 4403 isExplicitSpecialization || 4404 isFunctionTemplateSpecialization); 4405 4406 if (isFriend) { 4407 // For now, claim that the objects have no previous declaration. 4408 if (FunctionTemplate) { 4409 FunctionTemplate->setObjectOfFriendDecl(false); 4410 FunctionTemplate->setAccess(AS_public); 4411 } 4412 NewFD->setObjectOfFriendDecl(false); 4413 NewFD->setAccess(AS_public); 4414 } 4415 4416 if (isa<CXXMethodDecl>(NewFD) && DC == CurContext && IsFunctionDefinition) { 4417 // A method is implicitly inline if it's defined in its class 4418 // definition. 4419 NewFD->setImplicitlyInline(); 4420 } 4421 4422 if (SC == SC_Static && isa<CXXMethodDecl>(NewFD) && 4423 !CurContext->isRecord()) { 4424 // C++ [class.static]p1: 4425 // A data or function member of a class may be declared static 4426 // in a class definition, in which case it is a static member of 4427 // the class. 4428 4429 // Complain about the 'static' specifier if it's on an out-of-line 4430 // member function definition. 4431 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4432 diag::err_static_out_of_line) 4433 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 4434 } 4435 } 4436 4437 // Handle GNU asm-label extension (encoded as an attribute). 4438 if (Expr *E = (Expr*) D.getAsmLabel()) { 4439 // The parser guarantees this is a string. 4440 StringLiteral *SE = cast<StringLiteral>(E); 4441 NewFD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), Context, 4442 SE->getString())); 4443 } 4444 4445 // Copy the parameter declarations from the declarator D to the function 4446 // declaration NewFD, if they are available. First scavenge them into Params. 4447 llvm::SmallVector<ParmVarDecl*, 16> Params; 4448 if (D.isFunctionDeclarator()) { 4449 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 4450 4451 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 4452 // function that takes no arguments, not a function that takes a 4453 // single void argument. 4454 // We let through "const void" here because Sema::GetTypeForDeclarator 4455 // already checks for that case. 4456 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 4457 FTI.ArgInfo[0].Param && 4458 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()) { 4459 // Empty arg list, don't push any params. 4460 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[0].Param); 4461 4462 // In C++, the empty parameter-type-list must be spelled "void"; a 4463 // typedef of void is not permitted. 4464 if (getLangOptions().CPlusPlus && 4465 Param->getType().getUnqualifiedType() != Context.VoidTy) { 4466 bool IsTypeAlias = false; 4467 if (const TypedefType *TT = Param->getType()->getAs<TypedefType>()) 4468 IsTypeAlias = isa<TypeAliasDecl>(TT->getDecl()); 4469 else if (const TemplateSpecializationType *TST = 4470 Param->getType()->getAs<TemplateSpecializationType>()) 4471 IsTypeAlias = TST->isTypeAlias(); 4472 Diag(Param->getLocation(), diag::err_param_typedef_of_void) 4473 << IsTypeAlias; 4474 } 4475 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 4476 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 4477 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 4478 assert(Param->getDeclContext() != NewFD && "Was set before ?"); 4479 Param->setDeclContext(NewFD); 4480 Params.push_back(Param); 4481 4482 if (Param->isInvalidDecl()) 4483 NewFD->setInvalidDecl(); 4484 } 4485 } 4486 4487 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) { 4488 // When we're declaring a function with a typedef, typeof, etc as in the 4489 // following example, we'll need to synthesize (unnamed) 4490 // parameters for use in the declaration. 4491 // 4492 // @code 4493 // typedef void fn(int); 4494 // fn f; 4495 // @endcode 4496 4497 // Synthesize a parameter for each argument type. 4498 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 4499 AE = FT->arg_type_end(); AI != AE; ++AI) { 4500 ParmVarDecl *Param = 4501 BuildParmVarDeclForTypedef(NewFD, D.getIdentifierLoc(), *AI); 4502 Param->setScopeInfo(0, Params.size()); 4503 Params.push_back(Param); 4504 } 4505 } else { 4506 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && 4507 "Should not need args for typedef of non-prototype fn"); 4508 } 4509 // Finally, we know we have the right number of parameters, install them. 4510 NewFD->setParams(Params.data(), Params.size()); 4511 4512 // Process the non-inheritable attributes on this declaration. 4513 ProcessDeclAttributes(S, NewFD, D, 4514 /*NonInheritable=*/true, /*Inheritable=*/false); 4515 4516 if (!getLangOptions().CPlusPlus) { 4517 // Perform semantic checking on the function declaration. 4518 bool isExplctSpecialization=false; 4519 CheckFunctionDeclaration(S, NewFD, Previous, isExplctSpecialization, 4520 Redeclaration); 4521 assert((NewFD->isInvalidDecl() || !Redeclaration || 4522 Previous.getResultKind() != LookupResult::FoundOverloaded) && 4523 "previous declaration set still overloaded"); 4524 } else { 4525 // If the declarator is a template-id, translate the parser's template 4526 // argument list into our AST format. 4527 bool HasExplicitTemplateArgs = false; 4528 TemplateArgumentListInfo TemplateArgs; 4529 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) { 4530 TemplateIdAnnotation *TemplateId = D.getName().TemplateId; 4531 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc); 4532 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc); 4533 ASTTemplateArgsPtr TemplateArgsPtr(*this, 4534 TemplateId->getTemplateArgs(), 4535 TemplateId->NumArgs); 4536 translateTemplateArguments(TemplateArgsPtr, 4537 TemplateArgs); 4538 TemplateArgsPtr.release(); 4539 4540 HasExplicitTemplateArgs = true; 4541 4542 if (FunctionTemplate) { 4543 // Function template with explicit template arguments. 4544 Diag(D.getIdentifierLoc(), diag::err_function_template_partial_spec) 4545 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc); 4546 4547 HasExplicitTemplateArgs = false; 4548 } else if (!isFunctionTemplateSpecialization && 4549 !D.getDeclSpec().isFriendSpecified()) { 4550 // We have encountered something that the user meant to be a 4551 // specialization (because it has explicitly-specified template 4552 // arguments) but that was not introduced with a "template<>" (or had 4553 // too few of them). 4554 Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header) 4555 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc) 4556 << FixItHint::CreateInsertion( 4557 D.getDeclSpec().getSourceRange().getBegin(), 4558 "template<> "); 4559 isFunctionTemplateSpecialization = true; 4560 } else { 4561 // "friend void foo<>(int);" is an implicit specialization decl. 4562 isFunctionTemplateSpecialization = true; 4563 } 4564 } else if (isFriend && isFunctionTemplateSpecialization) { 4565 // This combination is only possible in a recovery case; the user 4566 // wrote something like: 4567 // template <> friend void foo(int); 4568 // which we're recovering from as if the user had written: 4569 // friend void foo<>(int); 4570 // Go ahead and fake up a template id. 4571 HasExplicitTemplateArgs = true; 4572 TemplateArgs.setLAngleLoc(D.getIdentifierLoc()); 4573 TemplateArgs.setRAngleLoc(D.getIdentifierLoc()); 4574 } 4575 4576 // If it's a friend (and only if it's a friend), it's possible 4577 // that either the specialized function type or the specialized 4578 // template is dependent, and therefore matching will fail. In 4579 // this case, don't check the specialization yet. 4580 if (isFunctionTemplateSpecialization && isFriend && 4581 (NewFD->getType()->isDependentType() || DC->isDependentContext())) { 4582 assert(HasExplicitTemplateArgs && 4583 "friend function specialization without template args"); 4584 if (CheckDependentFunctionTemplateSpecialization(NewFD, TemplateArgs, 4585 Previous)) 4586 NewFD->setInvalidDecl(); 4587 } else if (isFunctionTemplateSpecialization) { 4588 if (CurContext->isDependentContext() && CurContext->isRecord() 4589 && !isFriend && !getLangOptions().Microsoft) { 4590 Diag(NewFD->getLocation(), diag::err_function_specialization_in_class) 4591 << NewFD->getDeclName(); 4592 NewFD->setInvalidDecl(); 4593 return 0; 4594 } else if (CheckFunctionTemplateSpecialization(NewFD, 4595 (HasExplicitTemplateArgs ? &TemplateArgs : 0), 4596 Previous)) 4597 NewFD->setInvalidDecl(); 4598 4599 // C++ [dcl.stc]p1: 4600 // A storage-class-specifier shall not be specified in an explicit 4601 // specialization (14.7.3) 4602 if (SC != SC_None) { 4603 Diag(NewFD->getLocation(), 4604 diag::err_explicit_specialization_storage_class) 4605 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 4606 } 4607 4608 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD)) { 4609 if (CheckMemberSpecialization(NewFD, Previous)) 4610 NewFD->setInvalidDecl(); 4611 } 4612 4613 // Perform semantic checking on the function declaration. 4614 CheckFunctionDeclaration(S, NewFD, Previous, isExplicitSpecialization, 4615 Redeclaration); 4616 4617 assert((NewFD->isInvalidDecl() || !Redeclaration || 4618 Previous.getResultKind() != LookupResult::FoundOverloaded) && 4619 "previous declaration set still overloaded"); 4620 4621 NamedDecl *PrincipalDecl = (FunctionTemplate 4622 ? cast<NamedDecl>(FunctionTemplate) 4623 : NewFD); 4624 4625 if (isFriend && Redeclaration) { 4626 AccessSpecifier Access = AS_public; 4627 if (!NewFD->isInvalidDecl()) 4628 Access = NewFD->getPreviousDeclaration()->getAccess(); 4629 4630 NewFD->setAccess(Access); 4631 if (FunctionTemplate) FunctionTemplate->setAccess(Access); 4632 4633 PrincipalDecl->setObjectOfFriendDecl(true); 4634 } 4635 4636 if (NewFD->isOverloadedOperator() && !DC->isRecord() && 4637 PrincipalDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary)) 4638 PrincipalDecl->setNonMemberOperator(); 4639 4640 // If we have a function template, check the template parameter 4641 // list. This will check and merge default template arguments. 4642 if (FunctionTemplate) { 4643 FunctionTemplateDecl *PrevTemplate = FunctionTemplate->getPreviousDeclaration(); 4644 CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(), 4645 PrevTemplate? PrevTemplate->getTemplateParameters() : 0, 4646 D.getDeclSpec().isFriendSpecified() 4647 ? (IsFunctionDefinition 4648 ? TPC_FriendFunctionTemplateDefinition 4649 : TPC_FriendFunctionTemplate) 4650 : (D.getCXXScopeSpec().isSet() && 4651 DC && DC->isRecord() && 4652 DC->isDependentContext()) 4653 ? TPC_ClassTemplateMember 4654 : TPC_FunctionTemplate); 4655 } 4656 4657 if (NewFD->isInvalidDecl()) { 4658 // Ignore all the rest of this. 4659 } else if (!Redeclaration) { 4660 // Fake up an access specifier if it's supposed to be a class member. 4661 if (isa<CXXRecordDecl>(NewFD->getDeclContext())) 4662 NewFD->setAccess(AS_public); 4663 4664 // Qualified decls generally require a previous declaration. 4665 if (D.getCXXScopeSpec().isSet()) { 4666 // ...with the major exception of templated-scope or 4667 // dependent-scope friend declarations. 4668 4669 // TODO: we currently also suppress this check in dependent 4670 // contexts because (1) the parameter depth will be off when 4671 // matching friend templates and (2) we might actually be 4672 // selecting a friend based on a dependent factor. But there 4673 // are situations where these conditions don't apply and we 4674 // can actually do this check immediately. 4675 if (isFriend && 4676 (TemplateParamLists.size() || 4677 D.getCXXScopeSpec().getScopeRep()->isDependent() || 4678 CurContext->isDependentContext())) { 4679 // ignore these 4680 } else { 4681 // The user tried to provide an out-of-line definition for a 4682 // function that is a member of a class or namespace, but there 4683 // was no such member function declared (C++ [class.mfct]p2, 4684 // C++ [namespace.memdef]p2). For example: 4685 // 4686 // class X { 4687 // void f() const; 4688 // }; 4689 // 4690 // void X::f() { } // ill-formed 4691 // 4692 // Complain about this problem, and attempt to suggest close 4693 // matches (e.g., those that differ only in cv-qualifiers and 4694 // whether the parameter types are references). 4695 Diag(D.getIdentifierLoc(), diag::err_member_def_does_not_match) 4696 << Name << DC << D.getCXXScopeSpec().getRange(); 4697 NewFD->setInvalidDecl(); 4698 4699 DiagnoseInvalidRedeclaration(*this, NewFD); 4700 } 4701 4702 // Unqualified local friend declarations are required to resolve 4703 // to something. 4704 } else if (isFriend && cast<CXXRecordDecl>(CurContext)->isLocalClass()) { 4705 Diag(D.getIdentifierLoc(), diag::err_no_matching_local_friend); 4706 NewFD->setInvalidDecl(); 4707 DiagnoseInvalidRedeclaration(*this, NewFD); 4708 } 4709 4710 } else if (!IsFunctionDefinition && D.getCXXScopeSpec().isSet() && 4711 !isFriend && !isFunctionTemplateSpecialization && 4712 !isExplicitSpecialization) { 4713 // An out-of-line member function declaration must also be a 4714 // definition (C++ [dcl.meaning]p1). 4715 // Note that this is not the case for explicit specializations of 4716 // function templates or member functions of class templates, per 4717 // C++ [temp.expl.spec]p2. We also allow these declarations as an extension 4718 // for compatibility with old SWIG code which likes to generate them. 4719 Diag(NewFD->getLocation(), diag::ext_out_of_line_declaration) 4720 << D.getCXXScopeSpec().getRange(); 4721 } 4722 } 4723 4724 4725 // Handle attributes. We need to have merged decls when handling attributes 4726 // (for example to check for conflicts, etc). 4727 // FIXME: This needs to happen before we merge declarations. Then, 4728 // let attribute merging cope with attribute conflicts. 4729 ProcessDeclAttributes(S, NewFD, D, 4730 /*NonInheritable=*/false, /*Inheritable=*/true); 4731 4732 // attributes declared post-definition are currently ignored 4733 // FIXME: This should happen during attribute merging 4734 if (Redeclaration && Previous.isSingleResult()) { 4735 const FunctionDecl *Def; 4736 FunctionDecl *PrevFD = dyn_cast<FunctionDecl>(Previous.getFoundDecl()); 4737 if (PrevFD && PrevFD->isDefined(Def) && D.hasAttributes()) { 4738 Diag(NewFD->getLocation(), diag::warn_attribute_precede_definition); 4739 Diag(Def->getLocation(), diag::note_previous_definition); 4740 } 4741 } 4742 4743 AddKnownFunctionAttributes(NewFD); 4744 4745 if (NewFD->hasAttr<OverloadableAttr>() && 4746 !NewFD->getType()->getAs<FunctionProtoType>()) { 4747 Diag(NewFD->getLocation(), 4748 diag::err_attribute_overloadable_no_prototype) 4749 << NewFD; 4750 4751 // Turn this into a variadic function with no parameters. 4752 const FunctionType *FT = NewFD->getType()->getAs<FunctionType>(); 4753 FunctionProtoType::ExtProtoInfo EPI; 4754 EPI.Variadic = true; 4755 EPI.ExtInfo = FT->getExtInfo(); 4756 4757 QualType R = Context.getFunctionType(FT->getResultType(), 0, 0, EPI); 4758 NewFD->setType(R); 4759 } 4760 4761 // If there's a #pragma GCC visibility in scope, and this isn't a class 4762 // member, set the visibility of this function. 4763 if (NewFD->getLinkage() == ExternalLinkage && !DC->isRecord()) 4764 AddPushedVisibilityAttribute(NewFD); 4765 4766 // If this is a locally-scoped extern C function, update the 4767 // map of such names. 4768 if (CurContext->isFunctionOrMethod() && NewFD->isExternC() 4769 && !NewFD->isInvalidDecl()) 4770 RegisterLocallyScopedExternCDecl(NewFD, Previous, S); 4771 4772 // Set this FunctionDecl's range up to the right paren. 4773 NewFD->setRangeEnd(D.getSourceRange().getEnd()); 4774 4775 if (getLangOptions().CPlusPlus) { 4776 if (FunctionTemplate) { 4777 if (NewFD->isInvalidDecl()) 4778 FunctionTemplate->setInvalidDecl(); 4779 return FunctionTemplate; 4780 } 4781 } 4782 4783 MarkUnusedFileScopedDecl(NewFD); 4784 4785 if (getLangOptions().CUDA) 4786 if (IdentifierInfo *II = NewFD->getIdentifier()) 4787 if (!NewFD->isInvalidDecl() && 4788 NewFD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 4789 if (II->isStr("cudaConfigureCall")) { 4790 if (!R->getAs<FunctionType>()->getResultType()->isScalarType()) 4791 Diag(NewFD->getLocation(), diag::err_config_scalar_return); 4792 4793 Context.setcudaConfigureCallDecl(NewFD); 4794 } 4795 } 4796 4797 return NewFD; 4798} 4799 4800/// \brief Perform semantic checking of a new function declaration. 4801/// 4802/// Performs semantic analysis of the new function declaration 4803/// NewFD. This routine performs all semantic checking that does not 4804/// require the actual declarator involved in the declaration, and is 4805/// used both for the declaration of functions as they are parsed 4806/// (called via ActOnDeclarator) and for the declaration of functions 4807/// that have been instantiated via C++ template instantiation (called 4808/// via InstantiateDecl). 4809/// 4810/// \param IsExplicitSpecialiation whether this new function declaration is 4811/// an explicit specialization of the previous declaration. 4812/// 4813/// This sets NewFD->isInvalidDecl() to true if there was an error. 4814void Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD, 4815 LookupResult &Previous, 4816 bool IsExplicitSpecialization, 4817 bool &Redeclaration) { 4818 // If NewFD is already known erroneous, don't do any of this checking. 4819 if (NewFD->isInvalidDecl()) { 4820 // If this is a class member, mark the class invalid immediately. 4821 // This avoids some consistency errors later. 4822 if (isa<CXXMethodDecl>(NewFD)) 4823 cast<CXXMethodDecl>(NewFD)->getParent()->setInvalidDecl(); 4824 4825 return; 4826 } 4827 4828 if (NewFD->getResultType()->isVariablyModifiedType()) { 4829 // Functions returning a variably modified type violate C99 6.7.5.2p2 4830 // because all functions have linkage. 4831 Diag(NewFD->getLocation(), diag::err_vm_func_decl); 4832 return NewFD->setInvalidDecl(); 4833 } 4834 4835 if (NewFD->isMain()) 4836 CheckMain(NewFD); 4837 4838 // Check for a previous declaration of this name. 4839 if (Previous.empty() && NewFD->isExternC()) { 4840 // Since we did not find anything by this name and we're declaring 4841 // an extern "C" function, look for a non-visible extern "C" 4842 // declaration with the same name. 4843 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 4844 = LocallyScopedExternalDecls.find(NewFD->getDeclName()); 4845 if (Pos != LocallyScopedExternalDecls.end()) 4846 Previous.addDecl(Pos->second); 4847 } 4848 4849 // Merge or overload the declaration with an existing declaration of 4850 // the same name, if appropriate. 4851 if (!Previous.empty()) { 4852 // Determine whether NewFD is an overload of PrevDecl or 4853 // a declaration that requires merging. If it's an overload, 4854 // there's no more work to do here; we'll just add the new 4855 // function to the scope. 4856 4857 NamedDecl *OldDecl = 0; 4858 if (!AllowOverloadingOfFunction(Previous, Context)) { 4859 Redeclaration = true; 4860 OldDecl = Previous.getFoundDecl(); 4861 } else { 4862 switch (CheckOverload(S, NewFD, Previous, OldDecl, 4863 /*NewIsUsingDecl*/ false)) { 4864 case Ovl_Match: 4865 Redeclaration = true; 4866 break; 4867 4868 case Ovl_NonFunction: 4869 Redeclaration = true; 4870 break; 4871 4872 case Ovl_Overload: 4873 Redeclaration = false; 4874 break; 4875 } 4876 4877 if (!getLangOptions().CPlusPlus && !NewFD->hasAttr<OverloadableAttr>()) { 4878 // If a function name is overloadable in C, then every function 4879 // with that name must be marked "overloadable". 4880 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 4881 << Redeclaration << NewFD; 4882 NamedDecl *OverloadedDecl = 0; 4883 if (Redeclaration) 4884 OverloadedDecl = OldDecl; 4885 else if (!Previous.empty()) 4886 OverloadedDecl = Previous.getRepresentativeDecl(); 4887 if (OverloadedDecl) 4888 Diag(OverloadedDecl->getLocation(), 4889 diag::note_attribute_overloadable_prev_overload); 4890 NewFD->addAttr(::new (Context) OverloadableAttr(SourceLocation(), 4891 Context)); 4892 } 4893 } 4894 4895 if (Redeclaration) { 4896 // NewFD and OldDecl represent declarations that need to be 4897 // merged. 4898 if (MergeFunctionDecl(NewFD, OldDecl)) 4899 return NewFD->setInvalidDecl(); 4900 4901 Previous.clear(); 4902 Previous.addDecl(OldDecl); 4903 4904 if (FunctionTemplateDecl *OldTemplateDecl 4905 = dyn_cast<FunctionTemplateDecl>(OldDecl)) { 4906 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl()); 4907 FunctionTemplateDecl *NewTemplateDecl 4908 = NewFD->getDescribedFunctionTemplate(); 4909 assert(NewTemplateDecl && "Template/non-template mismatch"); 4910 if (CXXMethodDecl *Method 4911 = dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) { 4912 Method->setAccess(OldTemplateDecl->getAccess()); 4913 NewTemplateDecl->setAccess(OldTemplateDecl->getAccess()); 4914 } 4915 4916 // If this is an explicit specialization of a member that is a function 4917 // template, mark it as a member specialization. 4918 if (IsExplicitSpecialization && 4919 NewTemplateDecl->getInstantiatedFromMemberTemplate()) { 4920 NewTemplateDecl->setMemberSpecialization(); 4921 assert(OldTemplateDecl->isMemberSpecialization()); 4922 } 4923 } else { 4924 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions 4925 NewFD->setAccess(OldDecl->getAccess()); 4926 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 4927 } 4928 } 4929 } 4930 4931 // Semantic checking for this function declaration (in isolation). 4932 if (getLangOptions().CPlusPlus) { 4933 // C++-specific checks. 4934 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { 4935 CheckConstructor(Constructor); 4936 } else if (CXXDestructorDecl *Destructor = 4937 dyn_cast<CXXDestructorDecl>(NewFD)) { 4938 CXXRecordDecl *Record = Destructor->getParent(); 4939 QualType ClassType = Context.getTypeDeclType(Record); 4940 4941 // FIXME: Shouldn't we be able to perform this check even when the class 4942 // type is dependent? Both gcc and edg can handle that. 4943 if (!ClassType->isDependentType()) { 4944 DeclarationName Name 4945 = Context.DeclarationNames.getCXXDestructorName( 4946 Context.getCanonicalType(ClassType)); 4947 if (NewFD->getDeclName() != Name) { 4948 Diag(NewFD->getLocation(), diag::err_destructor_name); 4949 return NewFD->setInvalidDecl(); 4950 } 4951 } 4952 } else if (CXXConversionDecl *Conversion 4953 = dyn_cast<CXXConversionDecl>(NewFD)) { 4954 ActOnConversionDeclarator(Conversion); 4955 } 4956 4957 // Find any virtual functions that this function overrides. 4958 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) { 4959 if (!Method->isFunctionTemplateSpecialization() && 4960 !Method->getDescribedFunctionTemplate()) { 4961 if (AddOverriddenMethods(Method->getParent(), Method)) { 4962 // If the function was marked as "static", we have a problem. 4963 if (NewFD->getStorageClass() == SC_Static) { 4964 Diag(NewFD->getLocation(), diag::err_static_overrides_virtual) 4965 << NewFD->getDeclName(); 4966 for (CXXMethodDecl::method_iterator 4967 Overridden = Method->begin_overridden_methods(), 4968 OverriddenEnd = Method->end_overridden_methods(); 4969 Overridden != OverriddenEnd; 4970 ++Overridden) { 4971 Diag((*Overridden)->getLocation(), 4972 diag::note_overridden_virtual_function); 4973 } 4974 } 4975 } 4976 } 4977 } 4978 4979 // Extra checking for C++ overloaded operators (C++ [over.oper]). 4980 if (NewFD->isOverloadedOperator() && 4981 CheckOverloadedOperatorDeclaration(NewFD)) 4982 return NewFD->setInvalidDecl(); 4983 4984 // Extra checking for C++0x literal operators (C++0x [over.literal]). 4985 if (NewFD->getLiteralIdentifier() && 4986 CheckLiteralOperatorDeclaration(NewFD)) 4987 return NewFD->setInvalidDecl(); 4988 4989 // In C++, check default arguments now that we have merged decls. Unless 4990 // the lexical context is the class, because in this case this is done 4991 // during delayed parsing anyway. 4992 if (!CurContext->isRecord()) 4993 CheckCXXDefaultArguments(NewFD); 4994 4995 // If this function declares a builtin function, check the type of this 4996 // declaration against the expected type for the builtin. 4997 if (unsigned BuiltinID = NewFD->getBuiltinID()) { 4998 ASTContext::GetBuiltinTypeError Error; 4999 QualType T = Context.GetBuiltinType(BuiltinID, Error); 5000 if (!T.isNull() && !Context.hasSameType(T, NewFD->getType())) { 5001 // The type of this function differs from the type of the builtin, 5002 // so forget about the builtin entirely. 5003 Context.BuiltinInfo.ForgetBuiltin(BuiltinID, Context.Idents); 5004 } 5005 } 5006 } 5007} 5008 5009void Sema::CheckMain(FunctionDecl* FD) { 5010 // C++ [basic.start.main]p3: A program that declares main to be inline 5011 // or static is ill-formed. 5012 // C99 6.7.4p4: In a hosted environment, the inline function specifier 5013 // shall not appear in a declaration of main. 5014 // static main is not an error under C99, but we should warn about it. 5015 bool isInline = FD->isInlineSpecified(); 5016 bool isStatic = FD->getStorageClass() == SC_Static; 5017 if (isInline || isStatic) { 5018 unsigned diagID = diag::warn_unusual_main_decl; 5019 if (isInline || getLangOptions().CPlusPlus) 5020 diagID = diag::err_unusual_main_decl; 5021 5022 int which = isStatic + (isInline << 1) - 1; 5023 Diag(FD->getLocation(), diagID) << which; 5024 } 5025 5026 QualType T = FD->getType(); 5027 assert(T->isFunctionType() && "function decl is not of function type"); 5028 const FunctionType* FT = T->getAs<FunctionType>(); 5029 5030 if (!Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) { 5031 Diag(FD->getTypeSpecStartLoc(), diag::err_main_returns_nonint); 5032 FD->setInvalidDecl(true); 5033 } 5034 5035 // Treat protoless main() as nullary. 5036 if (isa<FunctionNoProtoType>(FT)) return; 5037 5038 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT); 5039 unsigned nparams = FTP->getNumArgs(); 5040 assert(FD->getNumParams() == nparams); 5041 5042 bool HasExtraParameters = (nparams > 3); 5043 5044 // Darwin passes an undocumented fourth argument of type char**. If 5045 // other platforms start sprouting these, the logic below will start 5046 // getting shifty. 5047 if (nparams == 4 && Context.Target.getTriple().isOSDarwin()) 5048 HasExtraParameters = false; 5049 5050 if (HasExtraParameters) { 5051 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams; 5052 FD->setInvalidDecl(true); 5053 nparams = 3; 5054 } 5055 5056 // FIXME: a lot of the following diagnostics would be improved 5057 // if we had some location information about types. 5058 5059 QualType CharPP = 5060 Context.getPointerType(Context.getPointerType(Context.CharTy)); 5061 QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP }; 5062 5063 for (unsigned i = 0; i < nparams; ++i) { 5064 QualType AT = FTP->getArgType(i); 5065 5066 bool mismatch = true; 5067 5068 if (Context.hasSameUnqualifiedType(AT, Expected[i])) 5069 mismatch = false; 5070 else if (Expected[i] == CharPP) { 5071 // As an extension, the following forms are okay: 5072 // char const ** 5073 // char const * const * 5074 // char * const * 5075 5076 QualifierCollector qs; 5077 const PointerType* PT; 5078 if ((PT = qs.strip(AT)->getAs<PointerType>()) && 5079 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) && 5080 (QualType(qs.strip(PT->getPointeeType()), 0) == Context.CharTy)) { 5081 qs.removeConst(); 5082 mismatch = !qs.empty(); 5083 } 5084 } 5085 5086 if (mismatch) { 5087 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i]; 5088 // TODO: suggest replacing given type with expected type 5089 FD->setInvalidDecl(true); 5090 } 5091 } 5092 5093 if (nparams == 1 && !FD->isInvalidDecl()) { 5094 Diag(FD->getLocation(), diag::warn_main_one_arg); 5095 } 5096 5097 if (!FD->isInvalidDecl() && FD->getDescribedFunctionTemplate()) { 5098 Diag(FD->getLocation(), diag::err_main_template_decl); 5099 FD->setInvalidDecl(); 5100 } 5101} 5102 5103bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 5104 // FIXME: Need strict checking. In C89, we need to check for 5105 // any assignment, increment, decrement, function-calls, or 5106 // commas outside of a sizeof. In C99, it's the same list, 5107 // except that the aforementioned are allowed in unevaluated 5108 // expressions. Everything else falls under the 5109 // "may accept other forms of constant expressions" exception. 5110 // (We never end up here for C++, so the constant expression 5111 // rules there don't matter.) 5112 if (Init->isConstantInitializer(Context, false)) 5113 return false; 5114 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 5115 << Init->getSourceRange(); 5116 return true; 5117} 5118 5119namespace { 5120 // Visits an initialization expression to see if OrigDecl is evaluated in 5121 // its own initialization and throws a warning if it does. 5122 class SelfReferenceChecker 5123 : public EvaluatedExprVisitor<SelfReferenceChecker> { 5124 Sema &S; 5125 Decl *OrigDecl; 5126 5127 public: 5128 typedef EvaluatedExprVisitor<SelfReferenceChecker> Inherited; 5129 5130 SelfReferenceChecker(Sema &S, Decl *OrigDecl) : Inherited(S.Context), 5131 S(S), OrigDecl(OrigDecl) { } 5132 5133 void VisitExpr(Expr *E) { 5134 if (isa<ObjCMessageExpr>(*E)) return; 5135 Inherited::VisitExpr(E); 5136 } 5137 5138 void VisitImplicitCastExpr(ImplicitCastExpr *E) { 5139 CheckForSelfReference(E); 5140 Inherited::VisitImplicitCastExpr(E); 5141 } 5142 5143 void CheckForSelfReference(ImplicitCastExpr *E) { 5144 if (E->getCastKind() != CK_LValueToRValue) return; 5145 Expr* SubExpr = E->getSubExpr()->IgnoreParenImpCasts(); 5146 DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(SubExpr); 5147 if (!DRE) return; 5148 Decl* ReferenceDecl = DRE->getDecl(); 5149 if (OrigDecl != ReferenceDecl) return; 5150 LookupResult Result(S, DRE->getNameInfo(), Sema::LookupOrdinaryName, 5151 Sema::NotForRedeclaration); 5152 S.DiagRuntimeBehavior(SubExpr->getLocStart(), SubExpr, 5153 S.PDiag(diag::warn_uninit_self_reference_in_init) 5154 << Result.getLookupName() 5155 << OrigDecl->getLocation() 5156 << SubExpr->getSourceRange()); 5157 } 5158 }; 5159} 5160 5161/// AddInitializerToDecl - Adds the initializer Init to the 5162/// declaration dcl. If DirectInit is true, this is C++ direct 5163/// initialization rather than copy initialization. 5164void Sema::AddInitializerToDecl(Decl *RealDecl, Expr *Init, 5165 bool DirectInit, bool TypeMayContainAuto) { 5166 // If there is no declaration, there was an error parsing it. Just ignore 5167 // the initializer. 5168 if (RealDecl == 0 || RealDecl->isInvalidDecl()) 5169 return; 5170 5171 // Check for self-references within variable initializers. 5172 if (VarDecl *vd = dyn_cast<VarDecl>(RealDecl)) { 5173 // Variables declared within a function/method body are handled 5174 // by a dataflow analysis. 5175 if (!vd->hasLocalStorage() && !vd->isStaticLocal()) 5176 SelfReferenceChecker(*this, RealDecl).VisitExpr(Init); 5177 } 5178 else { 5179 SelfReferenceChecker(*this, RealDecl).VisitExpr(Init); 5180 } 5181 5182 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 5183 // With declarators parsed the way they are, the parser cannot 5184 // distinguish between a normal initializer and a pure-specifier. 5185 // Thus this grotesque test. 5186 IntegerLiteral *IL; 5187 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 5188 Context.getCanonicalType(IL->getType()) == Context.IntTy) 5189 CheckPureMethod(Method, Init->getSourceRange()); 5190 else { 5191 Diag(Method->getLocation(), diag::err_member_function_initialization) 5192 << Method->getDeclName() << Init->getSourceRange(); 5193 Method->setInvalidDecl(); 5194 } 5195 return; 5196 } 5197 5198 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 5199 if (!VDecl) { 5200 if (getLangOptions().CPlusPlus && 5201 RealDecl->getLexicalDeclContext()->isRecord() && 5202 isa<NamedDecl>(RealDecl)) 5203 Diag(RealDecl->getLocation(), diag::err_member_initialization); 5204 else 5205 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 5206 RealDecl->setInvalidDecl(); 5207 return; 5208 } 5209 5210 // C++0x [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 5211 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 5212 TypeSourceInfo *DeducedType = 0; 5213 if (!DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType)) 5214 Diag(VDecl->getLocation(), diag::err_auto_var_deduction_failure) 5215 << VDecl->getDeclName() << VDecl->getType() << Init->getType() 5216 << Init->getSourceRange(); 5217 if (!DeducedType) { 5218 RealDecl->setInvalidDecl(); 5219 return; 5220 } 5221 VDecl->setTypeSourceInfo(DeducedType); 5222 VDecl->setType(DeducedType->getType()); 5223 5224 // If this is a redeclaration, check that the type we just deduced matches 5225 // the previously declared type. 5226 if (VarDecl *Old = VDecl->getPreviousDeclaration()) 5227 MergeVarDeclTypes(VDecl, Old); 5228 } 5229 5230 5231 // A definition must end up with a complete type, which means it must be 5232 // complete with the restriction that an array type might be completed by the 5233 // initializer; note that later code assumes this restriction. 5234 QualType BaseDeclType = VDecl->getType(); 5235 if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType)) 5236 BaseDeclType = Array->getElementType(); 5237 if (RequireCompleteType(VDecl->getLocation(), BaseDeclType, 5238 diag::err_typecheck_decl_incomplete_type)) { 5239 RealDecl->setInvalidDecl(); 5240 return; 5241 } 5242 5243 // The variable can not have an abstract class type. 5244 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 5245 diag::err_abstract_type_in_decl, 5246 AbstractVariableType)) 5247 VDecl->setInvalidDecl(); 5248 5249 const VarDecl *Def; 5250 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 5251 Diag(VDecl->getLocation(), diag::err_redefinition) 5252 << VDecl->getDeclName(); 5253 Diag(Def->getLocation(), diag::note_previous_definition); 5254 VDecl->setInvalidDecl(); 5255 return; 5256 } 5257 5258 const VarDecl* PrevInit = 0; 5259 if (getLangOptions().CPlusPlus) { 5260 // C++ [class.static.data]p4 5261 // If a static data member is of const integral or const 5262 // enumeration type, its declaration in the class definition can 5263 // specify a constant-initializer which shall be an integral 5264 // constant expression (5.19). In that case, the member can appear 5265 // in integral constant expressions. The member shall still be 5266 // defined in a namespace scope if it is used in the program and the 5267 // namespace scope definition shall not contain an initializer. 5268 // 5269 // We already performed a redefinition check above, but for static 5270 // data members we also need to check whether there was an in-class 5271 // declaration with an initializer. 5272 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 5273 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 5274 Diag(PrevInit->getLocation(), diag::note_previous_definition); 5275 return; 5276 } 5277 5278 if (VDecl->hasLocalStorage()) 5279 getCurFunction()->setHasBranchProtectedScope(); 5280 5281 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) { 5282 VDecl->setInvalidDecl(); 5283 return; 5284 } 5285 } 5286 5287 // Capture the variable that is being initialized and the style of 5288 // initialization. 5289 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 5290 5291 // FIXME: Poor source location information. 5292 InitializationKind Kind 5293 = DirectInit? InitializationKind::CreateDirect(VDecl->getLocation(), 5294 Init->getLocStart(), 5295 Init->getLocEnd()) 5296 : InitializationKind::CreateCopy(VDecl->getLocation(), 5297 Init->getLocStart()); 5298 5299 // Get the decls type and save a reference for later, since 5300 // CheckInitializerTypes may change it. 5301 QualType DclT = VDecl->getType(), SavT = DclT; 5302 if (VDecl->isLocalVarDecl()) { 5303 if (VDecl->hasExternalStorage()) { // C99 6.7.8p5 5304 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 5305 VDecl->setInvalidDecl(); 5306 } else if (!VDecl->isInvalidDecl()) { 5307 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 5308 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 5309 MultiExprArg(*this, &Init, 1), 5310 &DclT); 5311 if (Result.isInvalid()) { 5312 VDecl->setInvalidDecl(); 5313 return; 5314 } 5315 5316 Init = Result.takeAs<Expr>(); 5317 5318 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 5319 // Don't check invalid declarations to avoid emitting useless diagnostics. 5320 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 5321 if (VDecl->getStorageClass() == SC_Static) // C99 6.7.8p4. 5322 CheckForConstantInitializer(Init, DclT); 5323 } 5324 } 5325 } else if (VDecl->isStaticDataMember() && 5326 VDecl->getLexicalDeclContext()->isRecord()) { 5327 // This is an in-class initialization for a static data member, e.g., 5328 // 5329 // struct S { 5330 // static const int value = 17; 5331 // }; 5332 5333 // Try to perform the initialization regardless. 5334 if (!VDecl->isInvalidDecl()) { 5335 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 5336 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 5337 MultiExprArg(*this, &Init, 1), 5338 &DclT); 5339 if (Result.isInvalid()) { 5340 VDecl->setInvalidDecl(); 5341 return; 5342 } 5343 5344 Init = Result.takeAs<Expr>(); 5345 } 5346 5347 // C++ [class.mem]p4: 5348 // A member-declarator can contain a constant-initializer only 5349 // if it declares a static member (9.4) of const integral or 5350 // const enumeration type, see 9.4.2. 5351 QualType T = VDecl->getType(); 5352 5353 // Do nothing on dependent types. 5354 if (T->isDependentType()) { 5355 5356 // Require constness. 5357 } else if (!T.isConstQualified()) { 5358 Diag(VDecl->getLocation(), diag::err_in_class_initializer_non_const) 5359 << Init->getSourceRange(); 5360 VDecl->setInvalidDecl(); 5361 5362 // We allow integer constant expressions in all cases. 5363 } else if (T->isIntegralOrEnumerationType()) { 5364 if (!Init->isValueDependent()) { 5365 // Check whether the expression is a constant expression. 5366 llvm::APSInt Value; 5367 SourceLocation Loc; 5368 if (!Init->isIntegerConstantExpr(Value, Context, &Loc)) { 5369 Diag(Loc, diag::err_in_class_initializer_non_constant) 5370 << Init->getSourceRange(); 5371 VDecl->setInvalidDecl(); 5372 } 5373 } 5374 5375 // We allow floating-point constants as an extension in C++03, and 5376 // C++0x has far more complicated rules that we don't really 5377 // implement fully. 5378 } else { 5379 bool Allowed = false; 5380 if (getLangOptions().CPlusPlus0x) { 5381 Allowed = T->isLiteralType(); 5382 } else if (T->isFloatingType()) { // also permits complex, which is ok 5383 Diag(VDecl->getLocation(), diag::ext_in_class_initializer_float_type) 5384 << T << Init->getSourceRange(); 5385 Allowed = true; 5386 } 5387 5388 if (!Allowed) { 5389 Diag(VDecl->getLocation(), diag::err_in_class_initializer_bad_type) 5390 << T << Init->getSourceRange(); 5391 VDecl->setInvalidDecl(); 5392 5393 // TODO: there are probably expressions that pass here that shouldn't. 5394 } else if (!Init->isValueDependent() && 5395 !Init->isConstantInitializer(Context, false)) { 5396 Diag(Init->getExprLoc(), diag::err_in_class_initializer_non_constant) 5397 << Init->getSourceRange(); 5398 VDecl->setInvalidDecl(); 5399 } 5400 } 5401 } else if (VDecl->isFileVarDecl()) { 5402 if (VDecl->getStorageClassAsWritten() == SC_Extern && 5403 (!getLangOptions().CPlusPlus || 5404 !Context.getBaseElementType(VDecl->getType()).isConstQualified())) 5405 Diag(VDecl->getLocation(), diag::warn_extern_init); 5406 if (!VDecl->isInvalidDecl()) { 5407 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 5408 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 5409 MultiExprArg(*this, &Init, 1), 5410 &DclT); 5411 if (Result.isInvalid()) { 5412 VDecl->setInvalidDecl(); 5413 return; 5414 } 5415 5416 Init = Result.takeAs<Expr>(); 5417 } 5418 5419 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 5420 // Don't check invalid declarations to avoid emitting useless diagnostics. 5421 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 5422 // C99 6.7.8p4. All file scoped initializers need to be constant. 5423 CheckForConstantInitializer(Init, DclT); 5424 } 5425 } 5426 // If the type changed, it means we had an incomplete type that was 5427 // completed by the initializer. For example: 5428 // int ary[] = { 1, 3, 5 }; 5429 // "ary" transitions from a VariableArrayType to a ConstantArrayType. 5430 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 5431 VDecl->setType(DclT); 5432 Init->setType(DclT); 5433 } 5434 5435 5436 // If this variable is a local declaration with record type, make sure it 5437 // doesn't have a flexible member initialization. We only support this as a 5438 // global/static definition. 5439 if (VDecl->hasLocalStorage()) 5440 if (const RecordType *RT = VDecl->getType()->getAs<RecordType>()) 5441 if (RT->getDecl()->hasFlexibleArrayMember()) { 5442 // Check whether the initializer tries to initialize the flexible 5443 // array member itself to anything other than an empty initializer list. 5444 if (InitListExpr *ILE = dyn_cast<InitListExpr>(Init)) { 5445 unsigned Index = std::distance(RT->getDecl()->field_begin(), 5446 RT->getDecl()->field_end()) - 1; 5447 if (Index < ILE->getNumInits() && 5448 !(isa<InitListExpr>(ILE->getInit(Index)) && 5449 cast<InitListExpr>(ILE->getInit(Index))->getNumInits() == 0)) { 5450 Diag(VDecl->getLocation(), diag::err_nonstatic_flexible_variable); 5451 VDecl->setInvalidDecl(); 5452 } 5453 } 5454 } 5455 5456 // Check any implicit conversions within the expression. 5457 CheckImplicitConversions(Init, VDecl->getLocation()); 5458 5459 Init = MaybeCreateExprWithCleanups(Init); 5460 // Attach the initializer to the decl. 5461 VDecl->setInit(Init); 5462 5463 CheckCompleteVariableDeclaration(VDecl); 5464} 5465 5466/// ActOnInitializerError - Given that there was an error parsing an 5467/// initializer for the given declaration, try to return to some form 5468/// of sanity. 5469void Sema::ActOnInitializerError(Decl *D) { 5470 // Our main concern here is re-establishing invariants like "a 5471 // variable's type is either dependent or complete". 5472 if (!D || D->isInvalidDecl()) return; 5473 5474 VarDecl *VD = dyn_cast<VarDecl>(D); 5475 if (!VD) return; 5476 5477 // Auto types are meaningless if we can't make sense of the initializer. 5478 if (ParsingInitForAutoVars.count(D)) { 5479 D->setInvalidDecl(); 5480 return; 5481 } 5482 5483 QualType Ty = VD->getType(); 5484 if (Ty->isDependentType()) return; 5485 5486 // Require a complete type. 5487 if (RequireCompleteType(VD->getLocation(), 5488 Context.getBaseElementType(Ty), 5489 diag::err_typecheck_decl_incomplete_type)) { 5490 VD->setInvalidDecl(); 5491 return; 5492 } 5493 5494 // Require an abstract type. 5495 if (RequireNonAbstractType(VD->getLocation(), Ty, 5496 diag::err_abstract_type_in_decl, 5497 AbstractVariableType)) { 5498 VD->setInvalidDecl(); 5499 return; 5500 } 5501 5502 // Don't bother complaining about constructors or destructors, 5503 // though. 5504} 5505 5506void Sema::ActOnUninitializedDecl(Decl *RealDecl, 5507 bool TypeMayContainAuto) { 5508 // If there is no declaration, there was an error parsing it. Just ignore it. 5509 if (RealDecl == 0) 5510 return; 5511 5512 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 5513 QualType Type = Var->getType(); 5514 5515 // C++0x [dcl.spec.auto]p3 5516 if (TypeMayContainAuto && Type->getContainedAutoType()) { 5517 Diag(Var->getLocation(), diag::err_auto_var_requires_init) 5518 << Var->getDeclName() << Type; 5519 Var->setInvalidDecl(); 5520 return; 5521 } 5522 5523 switch (Var->isThisDeclarationADefinition()) { 5524 case VarDecl::Definition: 5525 if (!Var->isStaticDataMember() || !Var->getAnyInitializer()) 5526 break; 5527 5528 // We have an out-of-line definition of a static data member 5529 // that has an in-class initializer, so we type-check this like 5530 // a declaration. 5531 // 5532 // Fall through 5533 5534 case VarDecl::DeclarationOnly: 5535 // It's only a declaration. 5536 5537 // Block scope. C99 6.7p7: If an identifier for an object is 5538 // declared with no linkage (C99 6.2.2p6), the type for the 5539 // object shall be complete. 5540 if (!Type->isDependentType() && Var->isLocalVarDecl() && 5541 !Var->getLinkage() && !Var->isInvalidDecl() && 5542 RequireCompleteType(Var->getLocation(), Type, 5543 diag::err_typecheck_decl_incomplete_type)) 5544 Var->setInvalidDecl(); 5545 5546 // Make sure that the type is not abstract. 5547 if (!Type->isDependentType() && !Var->isInvalidDecl() && 5548 RequireNonAbstractType(Var->getLocation(), Type, 5549 diag::err_abstract_type_in_decl, 5550 AbstractVariableType)) 5551 Var->setInvalidDecl(); 5552 return; 5553 5554 case VarDecl::TentativeDefinition: 5555 // File scope. C99 6.9.2p2: A declaration of an identifier for an 5556 // object that has file scope without an initializer, and without a 5557 // storage-class specifier or with the storage-class specifier "static", 5558 // constitutes a tentative definition. Note: A tentative definition with 5559 // external linkage is valid (C99 6.2.2p5). 5560 if (!Var->isInvalidDecl()) { 5561 if (const IncompleteArrayType *ArrayT 5562 = Context.getAsIncompleteArrayType(Type)) { 5563 if (RequireCompleteType(Var->getLocation(), 5564 ArrayT->getElementType(), 5565 diag::err_illegal_decl_array_incomplete_type)) 5566 Var->setInvalidDecl(); 5567 } else if (Var->getStorageClass() == SC_Static) { 5568 // C99 6.9.2p3: If the declaration of an identifier for an object is 5569 // a tentative definition and has internal linkage (C99 6.2.2p3), the 5570 // declared type shall not be an incomplete type. 5571 // NOTE: code such as the following 5572 // static struct s; 5573 // struct s { int a; }; 5574 // is accepted by gcc. Hence here we issue a warning instead of 5575 // an error and we do not invalidate the static declaration. 5576 // NOTE: to avoid multiple warnings, only check the first declaration. 5577 if (Var->getPreviousDeclaration() == 0) 5578 RequireCompleteType(Var->getLocation(), Type, 5579 diag::ext_typecheck_decl_incomplete_type); 5580 } 5581 } 5582 5583 // Record the tentative definition; we're done. 5584 if (!Var->isInvalidDecl()) 5585 TentativeDefinitions.push_back(Var); 5586 return; 5587 } 5588 5589 // Provide a specific diagnostic for uninitialized variable 5590 // definitions with incomplete array type. 5591 if (Type->isIncompleteArrayType()) { 5592 Diag(Var->getLocation(), 5593 diag::err_typecheck_incomplete_array_needs_initializer); 5594 Var->setInvalidDecl(); 5595 return; 5596 } 5597 5598 // Provide a specific diagnostic for uninitialized variable 5599 // definitions with reference type. 5600 if (Type->isReferenceType()) { 5601 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 5602 << Var->getDeclName() 5603 << SourceRange(Var->getLocation(), Var->getLocation()); 5604 Var->setInvalidDecl(); 5605 return; 5606 } 5607 5608 // Do not attempt to type-check the default initializer for a 5609 // variable with dependent type. 5610 if (Type->isDependentType()) 5611 return; 5612 5613 if (Var->isInvalidDecl()) 5614 return; 5615 5616 if (RequireCompleteType(Var->getLocation(), 5617 Context.getBaseElementType(Type), 5618 diag::err_typecheck_decl_incomplete_type)) { 5619 Var->setInvalidDecl(); 5620 return; 5621 } 5622 5623 // The variable can not have an abstract class type. 5624 if (RequireNonAbstractType(Var->getLocation(), Type, 5625 diag::err_abstract_type_in_decl, 5626 AbstractVariableType)) { 5627 Var->setInvalidDecl(); 5628 return; 5629 } 5630 5631 // Check for jumps past the implicit initializer. C++0x 5632 // clarifies that this applies to a "variable with automatic 5633 // storage duration", not a "local variable". 5634 // C++0x [stmt.dcl]p3 5635 // A program that jumps from a point where a variable with automatic 5636 // storage duration is not in scope to a point where it is in scope is 5637 // ill-formed unless the variable has scalar type, class type with a 5638 // trivial default constructor and a trivial destructor, a cv-qualified 5639 // version of one of these types, or an array of one of the preceding 5640 // types and is declared without an initializer. 5641 if (getLangOptions().CPlusPlus && Var->hasLocalStorage()) { 5642 if (const RecordType *Record 5643 = Context.getBaseElementType(Type)->getAs<RecordType>()) { 5644 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record->getDecl()); 5645 if ((!getLangOptions().CPlusPlus0x && !CXXRecord->isPOD()) || 5646 (getLangOptions().CPlusPlus0x && 5647 (!CXXRecord->hasTrivialDefaultConstructor() || 5648 (!CXXRecord->hasTrivialDestructor())))) 5649 getCurFunction()->setHasBranchProtectedScope(); 5650 } 5651 } 5652 5653 // C++03 [dcl.init]p9: 5654 // If no initializer is specified for an object, and the 5655 // object is of (possibly cv-qualified) non-POD class type (or 5656 // array thereof), the object shall be default-initialized; if 5657 // the object is of const-qualified type, the underlying class 5658 // type shall have a user-declared default 5659 // constructor. Otherwise, if no initializer is specified for 5660 // a non- static object, the object and its subobjects, if 5661 // any, have an indeterminate initial value); if the object 5662 // or any of its subobjects are of const-qualified type, the 5663 // program is ill-formed. 5664 // C++0x [dcl.init]p11: 5665 // If no initializer is specified for an object, the object is 5666 // default-initialized; [...]. 5667 InitializedEntity Entity = InitializedEntity::InitializeVariable(Var); 5668 InitializationKind Kind 5669 = InitializationKind::CreateDefault(Var->getLocation()); 5670 5671 InitializationSequence InitSeq(*this, Entity, Kind, 0, 0); 5672 ExprResult Init = InitSeq.Perform(*this, Entity, Kind, 5673 MultiExprArg(*this, 0, 0)); 5674 if (Init.isInvalid()) 5675 Var->setInvalidDecl(); 5676 else if (Init.get()) 5677 Var->setInit(MaybeCreateExprWithCleanups(Init.get())); 5678 5679 CheckCompleteVariableDeclaration(Var); 5680 } 5681} 5682 5683void Sema::ActOnCXXForRangeDecl(Decl *D) { 5684 VarDecl *VD = dyn_cast<VarDecl>(D); 5685 if (!VD) { 5686 Diag(D->getLocation(), diag::err_for_range_decl_must_be_var); 5687 D->setInvalidDecl(); 5688 return; 5689 } 5690 5691 VD->setCXXForRangeDecl(true); 5692 5693 // for-range-declaration cannot be given a storage class specifier. 5694 int Error = -1; 5695 switch (VD->getStorageClassAsWritten()) { 5696 case SC_None: 5697 break; 5698 case SC_Extern: 5699 Error = 0; 5700 break; 5701 case SC_Static: 5702 Error = 1; 5703 break; 5704 case SC_PrivateExtern: 5705 Error = 2; 5706 break; 5707 case SC_Auto: 5708 Error = 3; 5709 break; 5710 case SC_Register: 5711 Error = 4; 5712 break; 5713 } 5714 // FIXME: constexpr isn't allowed here. 5715 //if (DS.isConstexprSpecified()) 5716 // Error = 5; 5717 if (Error != -1) { 5718 Diag(VD->getOuterLocStart(), diag::err_for_range_storage_class) 5719 << VD->getDeclName() << Error; 5720 D->setInvalidDecl(); 5721 } 5722} 5723 5724void Sema::CheckCompleteVariableDeclaration(VarDecl *var) { 5725 if (var->isInvalidDecl()) return; 5726 5727 // All the following checks are C++ only. 5728 if (!getLangOptions().CPlusPlus) return; 5729 5730 QualType baseType = Context.getBaseElementType(var->getType()); 5731 if (baseType->isDependentType()) return; 5732 5733 // __block variables might require us to capture a copy-initializer. 5734 if (var->hasAttr<BlocksAttr>()) { 5735 // It's currently invalid to ever have a __block variable with an 5736 // array type; should we diagnose that here? 5737 5738 // Regardless, we don't want to ignore array nesting when 5739 // constructing this copy. 5740 QualType type = var->getType(); 5741 5742 if (type->isStructureOrClassType()) { 5743 SourceLocation poi = var->getLocation(); 5744 Expr *varRef = new (Context) DeclRefExpr(var, type, VK_LValue, poi); 5745 ExprResult result = 5746 PerformCopyInitialization( 5747 InitializedEntity::InitializeBlock(poi, type, false), 5748 poi, Owned(varRef)); 5749 if (!result.isInvalid()) { 5750 result = MaybeCreateExprWithCleanups(result); 5751 Expr *init = result.takeAs<Expr>(); 5752 Context.setBlockVarCopyInits(var, init); 5753 } 5754 } 5755 } 5756 5757 // Check for global constructors. 5758 if (!var->getDeclContext()->isDependentContext() && 5759 var->hasGlobalStorage() && 5760 !var->isStaticLocal() && 5761 var->getInit() && 5762 !var->getInit()->isConstantInitializer(Context, 5763 baseType->isReferenceType())) 5764 Diag(var->getLocation(), diag::warn_global_constructor) 5765 << var->getInit()->getSourceRange(); 5766 5767 // Require the destructor. 5768 if (const RecordType *recordType = baseType->getAs<RecordType>()) 5769 FinalizeVarWithDestructor(var, recordType); 5770} 5771 5772/// FinalizeDeclaration - called by ParseDeclarationAfterDeclarator to perform 5773/// any semantic actions necessary after any initializer has been attached. 5774void 5775Sema::FinalizeDeclaration(Decl *ThisDecl) { 5776 // Note that we are no longer parsing the initializer for this declaration. 5777 ParsingInitForAutoVars.erase(ThisDecl); 5778} 5779 5780Sema::DeclGroupPtrTy 5781Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, 5782 Decl **Group, unsigned NumDecls) { 5783 llvm::SmallVector<Decl*, 8> Decls; 5784 5785 if (DS.isTypeSpecOwned()) 5786 Decls.push_back(DS.getRepAsDecl()); 5787 5788 for (unsigned i = 0; i != NumDecls; ++i) 5789 if (Decl *D = Group[i]) 5790 Decls.push_back(D); 5791 5792 return BuildDeclaratorGroup(Decls.data(), Decls.size(), 5793 DS.getTypeSpecType() == DeclSpec::TST_auto); 5794} 5795 5796/// BuildDeclaratorGroup - convert a list of declarations into a declaration 5797/// group, performing any necessary semantic checking. 5798Sema::DeclGroupPtrTy 5799Sema::BuildDeclaratorGroup(Decl **Group, unsigned NumDecls, 5800 bool TypeMayContainAuto) { 5801 // C++0x [dcl.spec.auto]p7: 5802 // If the type deduced for the template parameter U is not the same in each 5803 // deduction, the program is ill-formed. 5804 // FIXME: When initializer-list support is added, a distinction is needed 5805 // between the deduced type U and the deduced type which 'auto' stands for. 5806 // auto a = 0, b = { 1, 2, 3 }; 5807 // is legal because the deduced type U is 'int' in both cases. 5808 if (TypeMayContainAuto && NumDecls > 1) { 5809 QualType Deduced; 5810 CanQualType DeducedCanon; 5811 VarDecl *DeducedDecl = 0; 5812 for (unsigned i = 0; i != NumDecls; ++i) { 5813 if (VarDecl *D = dyn_cast<VarDecl>(Group[i])) { 5814 AutoType *AT = D->getType()->getContainedAutoType(); 5815 // Don't reissue diagnostics when instantiating a template. 5816 if (AT && D->isInvalidDecl()) 5817 break; 5818 if (AT && AT->isDeduced()) { 5819 QualType U = AT->getDeducedType(); 5820 CanQualType UCanon = Context.getCanonicalType(U); 5821 if (Deduced.isNull()) { 5822 Deduced = U; 5823 DeducedCanon = UCanon; 5824 DeducedDecl = D; 5825 } else if (DeducedCanon != UCanon) { 5826 Diag(D->getTypeSourceInfo()->getTypeLoc().getBeginLoc(), 5827 diag::err_auto_different_deductions) 5828 << Deduced << DeducedDecl->getDeclName() 5829 << U << D->getDeclName() 5830 << DeducedDecl->getInit()->getSourceRange() 5831 << D->getInit()->getSourceRange(); 5832 D->setInvalidDecl(); 5833 break; 5834 } 5835 } 5836 } 5837 } 5838 } 5839 5840 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, NumDecls)); 5841} 5842 5843 5844/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 5845/// to introduce parameters into function prototype scope. 5846Decl *Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 5847 const DeclSpec &DS = D.getDeclSpec(); 5848 5849 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 5850 VarDecl::StorageClass StorageClass = SC_None; 5851 VarDecl::StorageClass StorageClassAsWritten = SC_None; 5852 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 5853 StorageClass = SC_Register; 5854 StorageClassAsWritten = SC_Register; 5855 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 5856 Diag(DS.getStorageClassSpecLoc(), 5857 diag::err_invalid_storage_class_in_func_decl); 5858 D.getMutableDeclSpec().ClearStorageClassSpecs(); 5859 } 5860 5861 if (D.getDeclSpec().isThreadSpecified()) 5862 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 5863 5864 DiagnoseFunctionSpecifiers(D); 5865 5866 TagDecl *OwnedDecl = 0; 5867 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S, &OwnedDecl); 5868 QualType parmDeclType = TInfo->getType(); 5869 5870 if (getLangOptions().CPlusPlus) { 5871 // Check that there are no default arguments inside the type of this 5872 // parameter. 5873 CheckExtraCXXDefaultArguments(D); 5874 5875 if (OwnedDecl && OwnedDecl->isDefinition()) { 5876 // C++ [dcl.fct]p6: 5877 // Types shall not be defined in return or parameter types. 5878 Diag(OwnedDecl->getLocation(), diag::err_type_defined_in_param_type) 5879 << Context.getTypeDeclType(OwnedDecl); 5880 } 5881 5882 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 5883 if (D.getCXXScopeSpec().isSet()) { 5884 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 5885 << D.getCXXScopeSpec().getRange(); 5886 D.getCXXScopeSpec().clear(); 5887 } 5888 } 5889 5890 // Ensure we have a valid name 5891 IdentifierInfo *II = 0; 5892 if (D.hasName()) { 5893 II = D.getIdentifier(); 5894 if (!II) { 5895 Diag(D.getIdentifierLoc(), diag::err_bad_parameter_name) 5896 << GetNameForDeclarator(D).getName().getAsString(); 5897 D.setInvalidType(true); 5898 } 5899 } 5900 5901 // Check for redeclaration of parameters, e.g. int foo(int x, int x); 5902 if (II) { 5903 LookupResult R(*this, II, D.getIdentifierLoc(), LookupOrdinaryName, 5904 ForRedeclaration); 5905 LookupName(R, S); 5906 if (R.isSingleResult()) { 5907 NamedDecl *PrevDecl = R.getFoundDecl(); 5908 if (PrevDecl->isTemplateParameter()) { 5909 // Maybe we will complain about the shadowed template parameter. 5910 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 5911 // Just pretend that we didn't see the previous declaration. 5912 PrevDecl = 0; 5913 } else if (S->isDeclScope(PrevDecl)) { 5914 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 5915 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 5916 5917 // Recover by removing the name 5918 II = 0; 5919 D.SetIdentifier(0, D.getIdentifierLoc()); 5920 D.setInvalidType(true); 5921 } 5922 } 5923 } 5924 5925 // Temporarily put parameter variables in the translation unit, not 5926 // the enclosing context. This prevents them from accidentally 5927 // looking like class members in C++. 5928 ParmVarDecl *New = CheckParameter(Context.getTranslationUnitDecl(), 5929 D.getSourceRange().getBegin(), 5930 D.getIdentifierLoc(), II, 5931 parmDeclType, TInfo, 5932 StorageClass, StorageClassAsWritten); 5933 5934 if (D.isInvalidType()) 5935 New->setInvalidDecl(); 5936 5937 assert(S->isFunctionPrototypeScope()); 5938 assert(S->getFunctionPrototypeDepth() >= 1); 5939 New->setScopeInfo(S->getFunctionPrototypeDepth() - 1, 5940 S->getNextFunctionPrototypeIndex()); 5941 5942 // Add the parameter declaration into this scope. 5943 S->AddDecl(New); 5944 if (II) 5945 IdResolver.AddDecl(New); 5946 5947 ProcessDeclAttributes(S, New, D); 5948 5949 if (New->hasAttr<BlocksAttr>()) { 5950 Diag(New->getLocation(), diag::err_block_on_nonlocal); 5951 } 5952 return New; 5953} 5954 5955/// \brief Synthesizes a variable for a parameter arising from a 5956/// typedef. 5957ParmVarDecl *Sema::BuildParmVarDeclForTypedef(DeclContext *DC, 5958 SourceLocation Loc, 5959 QualType T) { 5960 /* FIXME: setting StartLoc == Loc. 5961 Would it be worth to modify callers so as to provide proper source 5962 location for the unnamed parameters, embedding the parameter's type? */ 5963 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, Loc, Loc, 0, 5964 T, Context.getTrivialTypeSourceInfo(T, Loc), 5965 SC_None, SC_None, 0); 5966 Param->setImplicit(); 5967 return Param; 5968} 5969 5970void Sema::DiagnoseUnusedParameters(ParmVarDecl * const *Param, 5971 ParmVarDecl * const *ParamEnd) { 5972 // Don't diagnose unused-parameter errors in template instantiations; we 5973 // will already have done so in the template itself. 5974 if (!ActiveTemplateInstantiations.empty()) 5975 return; 5976 5977 for (; Param != ParamEnd; ++Param) { 5978 if (!(*Param)->isUsed() && (*Param)->getDeclName() && 5979 !(*Param)->hasAttr<UnusedAttr>()) { 5980 Diag((*Param)->getLocation(), diag::warn_unused_parameter) 5981 << (*Param)->getDeclName(); 5982 } 5983 } 5984} 5985 5986void Sema::DiagnoseSizeOfParametersAndReturnValue(ParmVarDecl * const *Param, 5987 ParmVarDecl * const *ParamEnd, 5988 QualType ReturnTy, 5989 NamedDecl *D) { 5990 if (LangOpts.NumLargeByValueCopy == 0) // No check. 5991 return; 5992 5993 // Warn if the return value is pass-by-value and larger than the specified 5994 // threshold. 5995 if (ReturnTy->isPODType()) { 5996 unsigned Size = Context.getTypeSizeInChars(ReturnTy).getQuantity(); 5997 if (Size > LangOpts.NumLargeByValueCopy) 5998 Diag(D->getLocation(), diag::warn_return_value_size) 5999 << D->getDeclName() << Size; 6000 } 6001 6002 // Warn if any parameter is pass-by-value and larger than the specified 6003 // threshold. 6004 for (; Param != ParamEnd; ++Param) { 6005 QualType T = (*Param)->getType(); 6006 if (!T->isPODType()) 6007 continue; 6008 unsigned Size = Context.getTypeSizeInChars(T).getQuantity(); 6009 if (Size > LangOpts.NumLargeByValueCopy) 6010 Diag((*Param)->getLocation(), diag::warn_parameter_size) 6011 << (*Param)->getDeclName() << Size; 6012 } 6013} 6014 6015ParmVarDecl *Sema::CheckParameter(DeclContext *DC, SourceLocation StartLoc, 6016 SourceLocation NameLoc, IdentifierInfo *Name, 6017 QualType T, TypeSourceInfo *TSInfo, 6018 VarDecl::StorageClass StorageClass, 6019 VarDecl::StorageClass StorageClassAsWritten) { 6020 ParmVarDecl *New = ParmVarDecl::Create(Context, DC, StartLoc, NameLoc, Name, 6021 adjustParameterType(T), TSInfo, 6022 StorageClass, StorageClassAsWritten, 6023 0); 6024 6025 // Parameters can not be abstract class types. 6026 // For record types, this is done by the AbstractClassUsageDiagnoser once 6027 // the class has been completely parsed. 6028 if (!CurContext->isRecord() && 6029 RequireNonAbstractType(NameLoc, T, diag::err_abstract_type_in_decl, 6030 AbstractParamType)) 6031 New->setInvalidDecl(); 6032 6033 // Parameter declarators cannot be interface types. All ObjC objects are 6034 // passed by reference. 6035 if (T->isObjCObjectType()) { 6036 Diag(NameLoc, 6037 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T; 6038 New->setInvalidDecl(); 6039 } 6040 6041 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage 6042 // duration shall not be qualified by an address-space qualifier." 6043 // Since all parameters have automatic store duration, they can not have 6044 // an address space. 6045 if (T.getAddressSpace() != 0) { 6046 Diag(NameLoc, diag::err_arg_with_address_space); 6047 New->setInvalidDecl(); 6048 } 6049 6050 return New; 6051} 6052 6053void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 6054 SourceLocation LocAfterDecls) { 6055 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 6056 6057 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 6058 // for a K&R function. 6059 if (!FTI.hasPrototype) { 6060 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 6061 --i; 6062 if (FTI.ArgInfo[i].Param == 0) { 6063 llvm::SmallString<256> Code; 6064 llvm::raw_svector_ostream(Code) << " int " 6065 << FTI.ArgInfo[i].Ident->getName() 6066 << ";\n"; 6067 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 6068 << FTI.ArgInfo[i].Ident 6069 << FixItHint::CreateInsertion(LocAfterDecls, Code.str()); 6070 6071 // Implicitly declare the argument as type 'int' for lack of a better 6072 // type. 6073 AttributeFactory attrs; 6074 DeclSpec DS(attrs); 6075 const char* PrevSpec; // unused 6076 unsigned DiagID; // unused 6077 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 6078 PrevSpec, DiagID); 6079 Declarator ParamD(DS, Declarator::KNRTypeListContext); 6080 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 6081 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 6082 } 6083 } 6084 } 6085} 6086 6087Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, 6088 Declarator &D) { 6089 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 6090 assert(D.isFunctionDeclarator() && "Not a function declarator!"); 6091 Scope *ParentScope = FnBodyScope->getParent(); 6092 6093 Decl *DP = HandleDeclarator(ParentScope, D, 6094 MultiTemplateParamsArg(*this), 6095 /*IsFunctionDefinition=*/true); 6096 return ActOnStartOfFunctionDef(FnBodyScope, DP); 6097} 6098 6099static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD) { 6100 // Don't warn about invalid declarations. 6101 if (FD->isInvalidDecl()) 6102 return false; 6103 6104 // Or declarations that aren't global. 6105 if (!FD->isGlobal()) 6106 return false; 6107 6108 // Don't warn about C++ member functions. 6109 if (isa<CXXMethodDecl>(FD)) 6110 return false; 6111 6112 // Don't warn about 'main'. 6113 if (FD->isMain()) 6114 return false; 6115 6116 // Don't warn about inline functions. 6117 if (FD->isInlined()) 6118 return false; 6119 6120 // Don't warn about function templates. 6121 if (FD->getDescribedFunctionTemplate()) 6122 return false; 6123 6124 // Don't warn about function template specializations. 6125 if (FD->isFunctionTemplateSpecialization()) 6126 return false; 6127 6128 bool MissingPrototype = true; 6129 for (const FunctionDecl *Prev = FD->getPreviousDeclaration(); 6130 Prev; Prev = Prev->getPreviousDeclaration()) { 6131 // Ignore any declarations that occur in function or method 6132 // scope, because they aren't visible from the header. 6133 if (Prev->getDeclContext()->isFunctionOrMethod()) 6134 continue; 6135 6136 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 6137 break; 6138 } 6139 6140 return MissingPrototype; 6141} 6142 6143void Sema::CheckForFunctionRedefinition(FunctionDecl *FD) { 6144 // Don't complain if we're in GNU89 mode and the previous definition 6145 // was an extern inline function. 6146 const FunctionDecl *Definition; 6147 if (FD->isDefined(Definition) && 6148 !canRedefineFunction(Definition, getLangOptions())) { 6149 if (getLangOptions().GNUMode && Definition->isInlineSpecified() && 6150 Definition->getStorageClass() == SC_Extern) 6151 Diag(FD->getLocation(), diag::err_redefinition_extern_inline) 6152 << FD->getDeclName() << getLangOptions().CPlusPlus; 6153 else 6154 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 6155 Diag(Definition->getLocation(), diag::note_previous_definition); 6156 } 6157} 6158 6159Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Decl *D) { 6160 // Clear the last template instantiation error context. 6161 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation(); 6162 6163 if (!D) 6164 return D; 6165 FunctionDecl *FD = 0; 6166 6167 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(D)) 6168 FD = FunTmpl->getTemplatedDecl(); 6169 else 6170 FD = cast<FunctionDecl>(D); 6171 6172 // Enter a new function scope 6173 PushFunctionScope(); 6174 6175 // See if this is a redefinition. 6176 if (!FD->isLateTemplateParsed()) 6177 CheckForFunctionRedefinition(FD); 6178 6179 // Builtin functions cannot be defined. 6180 if (unsigned BuiltinID = FD->getBuiltinID()) { 6181 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 6182 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 6183 FD->setInvalidDecl(); 6184 } 6185 } 6186 6187 // The return type of a function definition must be complete 6188 // (C99 6.9.1p3, C++ [dcl.fct]p6). 6189 QualType ResultType = FD->getResultType(); 6190 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 6191 !FD->isInvalidDecl() && 6192 RequireCompleteType(FD->getLocation(), ResultType, 6193 diag::err_func_def_incomplete_result)) 6194 FD->setInvalidDecl(); 6195 6196 // GNU warning -Wmissing-prototypes: 6197 // Warn if a global function is defined without a previous 6198 // prototype declaration. This warning is issued even if the 6199 // definition itself provides a prototype. The aim is to detect 6200 // global functions that fail to be declared in header files. 6201 if (ShouldWarnAboutMissingPrototype(FD)) 6202 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 6203 6204 if (FnBodyScope) 6205 PushDeclContext(FnBodyScope, FD); 6206 6207 // Check the validity of our function parameters 6208 CheckParmsForFunctionDef(FD->param_begin(), FD->param_end(), 6209 /*CheckParameterNames=*/true); 6210 6211 // Introduce our parameters into the function scope 6212 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 6213 ParmVarDecl *Param = FD->getParamDecl(p); 6214 Param->setOwningFunction(FD); 6215 6216 // If this has an identifier, add it to the scope stack. 6217 if (Param->getIdentifier() && FnBodyScope) { 6218 CheckShadow(FnBodyScope, Param); 6219 6220 PushOnScopeChains(Param, FnBodyScope); 6221 } 6222 } 6223 6224 // Checking attributes of current function definition 6225 // dllimport attribute. 6226 DLLImportAttr *DA = FD->getAttr<DLLImportAttr>(); 6227 if (DA && (!FD->getAttr<DLLExportAttr>())) { 6228 // dllimport attribute cannot be directly applied to definition. 6229 // Microsoft accepts dllimport for functions defined within class scope. 6230 if (!DA->isInherited() && 6231 !(LangOpts.Microsoft && FD->getLexicalDeclContext()->isRecord())) { 6232 Diag(FD->getLocation(), 6233 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 6234 << "dllimport"; 6235 FD->setInvalidDecl(); 6236 return FD; 6237 } 6238 6239 // Visual C++ appears to not think this is an issue, so only issue 6240 // a warning when Microsoft extensions are disabled. 6241 if (!LangOpts.Microsoft) { 6242 // If a symbol previously declared dllimport is later defined, the 6243 // attribute is ignored in subsequent references, and a warning is 6244 // emitted. 6245 Diag(FD->getLocation(), 6246 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 6247 << FD->getName() << "dllimport"; 6248 } 6249 } 6250 return FD; 6251} 6252 6253/// \brief Given the set of return statements within a function body, 6254/// compute the variables that are subject to the named return value 6255/// optimization. 6256/// 6257/// Each of the variables that is subject to the named return value 6258/// optimization will be marked as NRVO variables in the AST, and any 6259/// return statement that has a marked NRVO variable as its NRVO candidate can 6260/// use the named return value optimization. 6261/// 6262/// This function applies a very simplistic algorithm for NRVO: if every return 6263/// statement in the function has the same NRVO candidate, that candidate is 6264/// the NRVO variable. 6265/// 6266/// FIXME: Employ a smarter algorithm that accounts for multiple return 6267/// statements and the lifetimes of the NRVO candidates. We should be able to 6268/// find a maximal set of NRVO variables. 6269static void ComputeNRVO(Stmt *Body, FunctionScopeInfo *Scope) { 6270 ReturnStmt **Returns = Scope->Returns.data(); 6271 6272 const VarDecl *NRVOCandidate = 0; 6273 for (unsigned I = 0, E = Scope->Returns.size(); I != E; ++I) { 6274 if (!Returns[I]->getNRVOCandidate()) 6275 return; 6276 6277 if (!NRVOCandidate) 6278 NRVOCandidate = Returns[I]->getNRVOCandidate(); 6279 else if (NRVOCandidate != Returns[I]->getNRVOCandidate()) 6280 return; 6281 } 6282 6283 if (NRVOCandidate) 6284 const_cast<VarDecl*>(NRVOCandidate)->setNRVOVariable(true); 6285} 6286 6287Decl *Sema::ActOnFinishFunctionBody(Decl *D, Stmt *BodyArg) { 6288 return ActOnFinishFunctionBody(D, move(BodyArg), false); 6289} 6290 6291Decl *Sema::ActOnFinishFunctionBody(Decl *dcl, Stmt *Body, 6292 bool IsInstantiation) { 6293 FunctionDecl *FD = 0; 6294 FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl); 6295 if (FunTmpl) 6296 FD = FunTmpl->getTemplatedDecl(); 6297 else 6298 FD = dyn_cast_or_null<FunctionDecl>(dcl); 6299 6300 sema::AnalysisBasedWarnings::Policy WP = AnalysisWarnings.getDefaultPolicy(); 6301 sema::AnalysisBasedWarnings::Policy *ActivePolicy = 0; 6302 6303 if (FD) { 6304 FD->setBody(Body); 6305 if (FD->isMain()) { 6306 // C and C++ allow for main to automagically return 0. 6307 // Implements C++ [basic.start.main]p5 and C99 5.1.2.2.3. 6308 FD->setHasImplicitReturnZero(true); 6309 WP.disableCheckFallThrough(); 6310 } 6311 6312 // MSVC permits the use of pure specifier (=0) on function definition, 6313 // defined at class scope, warn about this non standard construct. 6314 if (getLangOptions().Microsoft && FD->isPure()) 6315 Diag(FD->getLocation(), diag::warn_pure_function_definition); 6316 6317 if (!FD->isInvalidDecl()) { 6318 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end()); 6319 DiagnoseSizeOfParametersAndReturnValue(FD->param_begin(), FD->param_end(), 6320 FD->getResultType(), FD); 6321 6322 // If this is a constructor, we need a vtable. 6323 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(FD)) 6324 MarkVTableUsed(FD->getLocation(), Constructor->getParent()); 6325 6326 ComputeNRVO(Body, getCurFunction()); 6327 } 6328 6329 assert(FD == getCurFunctionDecl() && "Function parsing confused"); 6330 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 6331 assert(MD == getCurMethodDecl() && "Method parsing confused"); 6332 MD->setBody(Body); 6333 if (Body) 6334 MD->setEndLoc(Body->getLocEnd()); 6335 if (!MD->isInvalidDecl()) { 6336 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end()); 6337 DiagnoseSizeOfParametersAndReturnValue(MD->param_begin(), MD->param_end(), 6338 MD->getResultType(), MD); 6339 } 6340 } else { 6341 return 0; 6342 } 6343 6344 // Verify and clean out per-function state. 6345 if (Body) { 6346 // C++ constructors that have function-try-blocks can't have return 6347 // statements in the handlers of that block. (C++ [except.handle]p14) 6348 // Verify this. 6349 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body)) 6350 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); 6351 6352 // Verify that that gotos and switch cases don't jump into scopes illegally. 6353 // Verify that that gotos and switch cases don't jump into scopes illegally. 6354 if (getCurFunction()->NeedsScopeChecking() && 6355 !dcl->isInvalidDecl() && 6356 !hasAnyErrorsInThisFunction()) 6357 DiagnoseInvalidJumps(Body); 6358 6359 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) { 6360 if (!Destructor->getParent()->isDependentType()) 6361 CheckDestructor(Destructor); 6362 6363 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 6364 Destructor->getParent()); 6365 } 6366 6367 // If any errors have occurred, clear out any temporaries that may have 6368 // been leftover. This ensures that these temporaries won't be picked up for 6369 // deletion in some later function. 6370 if (PP.getDiagnostics().hasErrorOccurred() || 6371 PP.getDiagnostics().getSuppressAllDiagnostics()) 6372 ExprTemporaries.clear(); 6373 else if (!isa<FunctionTemplateDecl>(dcl)) { 6374 // Since the body is valid, issue any analysis-based warnings that are 6375 // enabled. 6376 ActivePolicy = &WP; 6377 } 6378 6379 assert(ExprTemporaries.empty() && "Leftover temporaries in function"); 6380 } 6381 6382 if (!IsInstantiation) 6383 PopDeclContext(); 6384 6385 PopFunctionOrBlockScope(ActivePolicy, dcl); 6386 6387 // If any errors have occurred, clear out any temporaries that may have 6388 // been leftover. This ensures that these temporaries won't be picked up for 6389 // deletion in some later function. 6390 if (getDiagnostics().hasErrorOccurred()) 6391 ExprTemporaries.clear(); 6392 6393 return dcl; 6394} 6395 6396/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 6397/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 6398NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 6399 IdentifierInfo &II, Scope *S) { 6400 // Before we produce a declaration for an implicitly defined 6401 // function, see whether there was a locally-scoped declaration of 6402 // this name as a function or variable. If so, use that 6403 // (non-visible) declaration, and complain about it. 6404 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 6405 = LocallyScopedExternalDecls.find(&II); 6406 if (Pos != LocallyScopedExternalDecls.end()) { 6407 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 6408 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 6409 return Pos->second; 6410 } 6411 6412 // Extension in C99. Legal in C90, but warn about it. 6413 if (II.getName().startswith("__builtin_")) 6414 Diag(Loc, diag::warn_builtin_unknown) << &II; 6415 else if (getLangOptions().C99) 6416 Diag(Loc, diag::ext_implicit_function_decl) << &II; 6417 else 6418 Diag(Loc, diag::warn_implicit_function_decl) << &II; 6419 6420 // Set a Declarator for the implicit definition: int foo(); 6421 const char *Dummy; 6422 AttributeFactory attrFactory; 6423 DeclSpec DS(attrFactory); 6424 unsigned DiagID; 6425 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID); 6426 (void)Error; // Silence warning. 6427 assert(!Error && "Error setting up implicit decl!"); 6428 Declarator D(DS, Declarator::BlockContext); 6429 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0, 6430 0, 0, true, SourceLocation(), 6431 EST_None, SourceLocation(), 6432 0, 0, 0, 0, Loc, Loc, D), 6433 DS.getAttributes(), 6434 SourceLocation()); 6435 D.SetIdentifier(&II, Loc); 6436 6437 // Insert this function into translation-unit scope. 6438 6439 DeclContext *PrevDC = CurContext; 6440 CurContext = Context.getTranslationUnitDecl(); 6441 6442 FunctionDecl *FD = dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D)); 6443 FD->setImplicit(); 6444 6445 CurContext = PrevDC; 6446 6447 AddKnownFunctionAttributes(FD); 6448 6449 return FD; 6450} 6451 6452/// \brief Adds any function attributes that we know a priori based on 6453/// the declaration of this function. 6454/// 6455/// These attributes can apply both to implicitly-declared builtins 6456/// (like __builtin___printf_chk) or to library-declared functions 6457/// like NSLog or printf. 6458void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 6459 if (FD->isInvalidDecl()) 6460 return; 6461 6462 // If this is a built-in function, map its builtin attributes to 6463 // actual attributes. 6464 if (unsigned BuiltinID = FD->getBuiltinID()) { 6465 // Handle printf-formatting attributes. 6466 unsigned FormatIdx; 6467 bool HasVAListArg; 6468 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 6469 if (!FD->getAttr<FormatAttr>()) 6470 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 6471 "printf", FormatIdx+1, 6472 HasVAListArg ? 0 : FormatIdx+2)); 6473 } 6474 if (Context.BuiltinInfo.isScanfLike(BuiltinID, FormatIdx, 6475 HasVAListArg)) { 6476 if (!FD->getAttr<FormatAttr>()) 6477 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 6478 "scanf", FormatIdx+1, 6479 HasVAListArg ? 0 : FormatIdx+2)); 6480 } 6481 6482 // Mark const if we don't care about errno and that is the only 6483 // thing preventing the function from being const. This allows 6484 // IRgen to use LLVM intrinsics for such functions. 6485 if (!getLangOptions().MathErrno && 6486 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 6487 if (!FD->getAttr<ConstAttr>()) 6488 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 6489 } 6490 6491 if (Context.BuiltinInfo.isNoThrow(BuiltinID)) 6492 FD->addAttr(::new (Context) NoThrowAttr(FD->getLocation(), Context)); 6493 if (Context.BuiltinInfo.isConst(BuiltinID)) 6494 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 6495 } 6496 6497 IdentifierInfo *Name = FD->getIdentifier(); 6498 if (!Name) 6499 return; 6500 if ((!getLangOptions().CPlusPlus && 6501 FD->getDeclContext()->isTranslationUnit()) || 6502 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 6503 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 6504 LinkageSpecDecl::lang_c)) { 6505 // Okay: this could be a libc/libm/Objective-C function we know 6506 // about. 6507 } else 6508 return; 6509 6510 if (Name->isStr("NSLog") || Name->isStr("NSLogv")) { 6511 // FIXME: NSLog and NSLogv should be target specific 6512 if (const FormatAttr *Format = FD->getAttr<FormatAttr>()) { 6513 // FIXME: We known better than our headers. 6514 const_cast<FormatAttr *>(Format)->setType(Context, "printf"); 6515 } else 6516 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 6517 "printf", 1, 6518 Name->isStr("NSLogv") ? 0 : 2)); 6519 } else if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { 6520 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be 6521 // target-specific builtins, perhaps? 6522 if (!FD->getAttr<FormatAttr>()) 6523 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 6524 "printf", 2, 6525 Name->isStr("vasprintf") ? 0 : 3)); 6526 } 6527} 6528 6529TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 6530 TypeSourceInfo *TInfo) { 6531 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 6532 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 6533 6534 if (!TInfo) { 6535 assert(D.isInvalidType() && "no declarator info for valid type"); 6536 TInfo = Context.getTrivialTypeSourceInfo(T); 6537 } 6538 6539 // Scope manipulation handled by caller. 6540 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 6541 D.getSourceRange().getBegin(), 6542 D.getIdentifierLoc(), 6543 D.getIdentifier(), 6544 TInfo); 6545 6546 // Bail out immediately if we have an invalid declaration. 6547 if (D.isInvalidType()) { 6548 NewTD->setInvalidDecl(); 6549 return NewTD; 6550 } 6551 6552 // C++ [dcl.typedef]p8: 6553 // If the typedef declaration defines an unnamed class (or 6554 // enum), the first typedef-name declared by the declaration 6555 // to be that class type (or enum type) is used to denote the 6556 // class type (or enum type) for linkage purposes only. 6557 // We need to check whether the type was declared in the declaration. 6558 switch (D.getDeclSpec().getTypeSpecType()) { 6559 case TST_enum: 6560 case TST_struct: 6561 case TST_union: 6562 case TST_class: { 6563 TagDecl *tagFromDeclSpec = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 6564 6565 // Do nothing if the tag is not anonymous or already has an 6566 // associated typedef (from an earlier typedef in this decl group). 6567 if (tagFromDeclSpec->getIdentifier()) break; 6568 if (tagFromDeclSpec->getTypedefNameForAnonDecl()) break; 6569 6570 // A well-formed anonymous tag must always be a TUK_Definition. 6571 assert(tagFromDeclSpec->isThisDeclarationADefinition()); 6572 6573 // The type must match the tag exactly; no qualifiers allowed. 6574 if (!Context.hasSameType(T, Context.getTagDeclType(tagFromDeclSpec))) 6575 break; 6576 6577 // Otherwise, set this is the anon-decl typedef for the tag. 6578 tagFromDeclSpec->setTypedefNameForAnonDecl(NewTD); 6579 break; 6580 } 6581 6582 default: 6583 break; 6584 } 6585 6586 return NewTD; 6587} 6588 6589 6590/// \brief Determine whether a tag with a given kind is acceptable 6591/// as a redeclaration of the given tag declaration. 6592/// 6593/// \returns true if the new tag kind is acceptable, false otherwise. 6594bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, 6595 TagTypeKind NewTag, 6596 SourceLocation NewTagLoc, 6597 const IdentifierInfo &Name) { 6598 // C++ [dcl.type.elab]p3: 6599 // The class-key or enum keyword present in the 6600 // elaborated-type-specifier shall agree in kind with the 6601 // declaration to which the name in the elaborated-type-specifier 6602 // refers. This rule also applies to the form of 6603 // elaborated-type-specifier that declares a class-name or 6604 // friend class since it can be construed as referring to the 6605 // definition of the class. Thus, in any 6606 // elaborated-type-specifier, the enum keyword shall be used to 6607 // refer to an enumeration (7.2), the union class-key shall be 6608 // used to refer to a union (clause 9), and either the class or 6609 // struct class-key shall be used to refer to a class (clause 9) 6610 // declared using the class or struct class-key. 6611 TagTypeKind OldTag = Previous->getTagKind(); 6612 if (OldTag == NewTag) 6613 return true; 6614 6615 if ((OldTag == TTK_Struct || OldTag == TTK_Class) && 6616 (NewTag == TTK_Struct || NewTag == TTK_Class)) { 6617 // Warn about the struct/class tag mismatch. 6618 bool isTemplate = false; 6619 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) 6620 isTemplate = Record->getDescribedClassTemplate(); 6621 6622 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 6623 << (NewTag == TTK_Class) 6624 << isTemplate << &Name 6625 << FixItHint::CreateReplacement(SourceRange(NewTagLoc), 6626 OldTag == TTK_Class? "class" : "struct"); 6627 Diag(Previous->getLocation(), diag::note_previous_use); 6628 return true; 6629 } 6630 return false; 6631} 6632 6633/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 6634/// former case, Name will be non-null. In the later case, Name will be null. 6635/// TagSpec indicates what kind of tag this is. TUK indicates whether this is a 6636/// reference/declaration/definition of a tag. 6637Decl *Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK, 6638 SourceLocation KWLoc, CXXScopeSpec &SS, 6639 IdentifierInfo *Name, SourceLocation NameLoc, 6640 AttributeList *Attr, AccessSpecifier AS, 6641 MultiTemplateParamsArg TemplateParameterLists, 6642 bool &OwnedDecl, bool &IsDependent, 6643 bool ScopedEnum, bool ScopedEnumUsesClassTag, 6644 TypeResult UnderlyingType) { 6645 // If this is not a definition, it must have a name. 6646 assert((Name != 0 || TUK == TUK_Definition) && 6647 "Nameless record must be a definition!"); 6648 assert(TemplateParameterLists.size() == 0 || TUK != TUK_Reference); 6649 6650 OwnedDecl = false; 6651 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 6652 6653 // FIXME: Check explicit specializations more carefully. 6654 bool isExplicitSpecialization = false; 6655 bool Invalid = false; 6656 6657 // We only need to do this matching if we have template parameters 6658 // or a scope specifier, which also conveniently avoids this work 6659 // for non-C++ cases. 6660 if (TemplateParameterLists.size() > 0 || 6661 (SS.isNotEmpty() && TUK != TUK_Reference)) { 6662 if (TemplateParameterList *TemplateParams 6663 = MatchTemplateParametersToScopeSpecifier(KWLoc, NameLoc, SS, 6664 TemplateParameterLists.get(), 6665 TemplateParameterLists.size(), 6666 TUK == TUK_Friend, 6667 isExplicitSpecialization, 6668 Invalid)) { 6669 if (TemplateParams->size() > 0) { 6670 // This is a declaration or definition of a class template (which may 6671 // be a member of another template). 6672 6673 if (Invalid) 6674 return 0; 6675 6676 OwnedDecl = false; 6677 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc, 6678 SS, Name, NameLoc, Attr, 6679 TemplateParams, AS, 6680 TemplateParameterLists.size() - 1, 6681 (TemplateParameterList**) TemplateParameterLists.release()); 6682 return Result.get(); 6683 } else { 6684 // The "template<>" header is extraneous. 6685 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 6686 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 6687 isExplicitSpecialization = true; 6688 } 6689 } 6690 } 6691 6692 // Figure out the underlying type if this a enum declaration. We need to do 6693 // this early, because it's needed to detect if this is an incompatible 6694 // redeclaration. 6695 llvm::PointerUnion<const Type*, TypeSourceInfo*> EnumUnderlying; 6696 6697 if (Kind == TTK_Enum) { 6698 if (UnderlyingType.isInvalid() || (!UnderlyingType.get() && ScopedEnum)) 6699 // No underlying type explicitly specified, or we failed to parse the 6700 // type, default to int. 6701 EnumUnderlying = Context.IntTy.getTypePtr(); 6702 else if (UnderlyingType.get()) { 6703 // C++0x 7.2p2: The type-specifier-seq of an enum-base shall name an 6704 // integral type; any cv-qualification is ignored. 6705 TypeSourceInfo *TI = 0; 6706 QualType T = GetTypeFromParser(UnderlyingType.get(), &TI); 6707 EnumUnderlying = TI; 6708 6709 SourceLocation UnderlyingLoc = TI->getTypeLoc().getBeginLoc(); 6710 6711 if (!T->isDependentType() && !T->isIntegralType(Context)) { 6712 Diag(UnderlyingLoc, diag::err_enum_invalid_underlying) 6713 << T; 6714 // Recover by falling back to int. 6715 EnumUnderlying = Context.IntTy.getTypePtr(); 6716 } 6717 6718 if (DiagnoseUnexpandedParameterPack(UnderlyingLoc, TI, 6719 UPPC_FixedUnderlyingType)) 6720 EnumUnderlying = Context.IntTy.getTypePtr(); 6721 6722 } else if (getLangOptions().Microsoft) 6723 // Microsoft enums are always of int type. 6724 EnumUnderlying = Context.IntTy.getTypePtr(); 6725 } 6726 6727 DeclContext *SearchDC = CurContext; 6728 DeclContext *DC = CurContext; 6729 bool isStdBadAlloc = false; 6730 6731 RedeclarationKind Redecl = ForRedeclaration; 6732 if (TUK == TUK_Friend || TUK == TUK_Reference) 6733 Redecl = NotForRedeclaration; 6734 6735 LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl); 6736 6737 if (Name && SS.isNotEmpty()) { 6738 // We have a nested-name tag ('struct foo::bar'). 6739 6740 // Check for invalid 'foo::'. 6741 if (SS.isInvalid()) { 6742 Name = 0; 6743 goto CreateNewDecl; 6744 } 6745 6746 // If this is a friend or a reference to a class in a dependent 6747 // context, don't try to make a decl for it. 6748 if (TUK == TUK_Friend || TUK == TUK_Reference) { 6749 DC = computeDeclContext(SS, false); 6750 if (!DC) { 6751 IsDependent = true; 6752 return 0; 6753 } 6754 } else { 6755 DC = computeDeclContext(SS, true); 6756 if (!DC) { 6757 Diag(SS.getRange().getBegin(), diag::err_dependent_nested_name_spec) 6758 << SS.getRange(); 6759 return 0; 6760 } 6761 } 6762 6763 if (RequireCompleteDeclContext(SS, DC)) 6764 return 0; 6765 6766 SearchDC = DC; 6767 // Look-up name inside 'foo::'. 6768 LookupQualifiedName(Previous, DC); 6769 6770 if (Previous.isAmbiguous()) 6771 return 0; 6772 6773 if (Previous.empty()) { 6774 // Name lookup did not find anything. However, if the 6775 // nested-name-specifier refers to the current instantiation, 6776 // and that current instantiation has any dependent base 6777 // classes, we might find something at instantiation time: treat 6778 // this as a dependent elaborated-type-specifier. 6779 // But this only makes any sense for reference-like lookups. 6780 if (Previous.wasNotFoundInCurrentInstantiation() && 6781 (TUK == TUK_Reference || TUK == TUK_Friend)) { 6782 IsDependent = true; 6783 return 0; 6784 } 6785 6786 // A tag 'foo::bar' must already exist. 6787 Diag(NameLoc, diag::err_not_tag_in_scope) 6788 << Kind << Name << DC << SS.getRange(); 6789 Name = 0; 6790 Invalid = true; 6791 goto CreateNewDecl; 6792 } 6793 } else if (Name) { 6794 // If this is a named struct, check to see if there was a previous forward 6795 // declaration or definition. 6796 // FIXME: We're looking into outer scopes here, even when we 6797 // shouldn't be. Doing so can result in ambiguities that we 6798 // shouldn't be diagnosing. 6799 LookupName(Previous, S); 6800 6801 if (Previous.isAmbiguous() && 6802 (TUK == TUK_Definition || TUK == TUK_Declaration)) { 6803 LookupResult::Filter F = Previous.makeFilter(); 6804 while (F.hasNext()) { 6805 NamedDecl *ND = F.next(); 6806 if (ND->getDeclContext()->getRedeclContext() != SearchDC) 6807 F.erase(); 6808 } 6809 F.done(); 6810 } 6811 6812 // Note: there used to be some attempt at recovery here. 6813 if (Previous.isAmbiguous()) 6814 return 0; 6815 6816 if (!getLangOptions().CPlusPlus && TUK != TUK_Reference) { 6817 // FIXME: This makes sure that we ignore the contexts associated 6818 // with C structs, unions, and enums when looking for a matching 6819 // tag declaration or definition. See the similar lookup tweak 6820 // in Sema::LookupName; is there a better way to deal with this? 6821 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 6822 SearchDC = SearchDC->getParent(); 6823 } 6824 } else if (S->isFunctionPrototypeScope()) { 6825 // If this is an enum declaration in function prototype scope, set its 6826 // initial context to the translation unit. 6827 SearchDC = Context.getTranslationUnitDecl(); 6828 } 6829 6830 if (Previous.isSingleResult() && 6831 Previous.getFoundDecl()->isTemplateParameter()) { 6832 // Maybe we will complain about the shadowed template parameter. 6833 DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl()); 6834 // Just pretend that we didn't see the previous declaration. 6835 Previous.clear(); 6836 } 6837 6838 if (getLangOptions().CPlusPlus && Name && DC && StdNamespace && 6839 DC->Equals(getStdNamespace()) && Name->isStr("bad_alloc")) { 6840 // This is a declaration of or a reference to "std::bad_alloc". 6841 isStdBadAlloc = true; 6842 6843 if (Previous.empty() && StdBadAlloc) { 6844 // std::bad_alloc has been implicitly declared (but made invisible to 6845 // name lookup). Fill in this implicit declaration as the previous 6846 // declaration, so that the declarations get chained appropriately. 6847 Previous.addDecl(getStdBadAlloc()); 6848 } 6849 } 6850 6851 // If we didn't find a previous declaration, and this is a reference 6852 // (or friend reference), move to the correct scope. In C++, we 6853 // also need to do a redeclaration lookup there, just in case 6854 // there's a shadow friend decl. 6855 if (Name && Previous.empty() && 6856 (TUK == TUK_Reference || TUK == TUK_Friend)) { 6857 if (Invalid) goto CreateNewDecl; 6858 assert(SS.isEmpty()); 6859 6860 if (TUK == TUK_Reference) { 6861 // C++ [basic.scope.pdecl]p5: 6862 // -- for an elaborated-type-specifier of the form 6863 // 6864 // class-key identifier 6865 // 6866 // if the elaborated-type-specifier is used in the 6867 // decl-specifier-seq or parameter-declaration-clause of a 6868 // function defined in namespace scope, the identifier is 6869 // declared as a class-name in the namespace that contains 6870 // the declaration; otherwise, except as a friend 6871 // declaration, the identifier is declared in the smallest 6872 // non-class, non-function-prototype scope that contains the 6873 // declaration. 6874 // 6875 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 6876 // C structs and unions. 6877 // 6878 // It is an error in C++ to declare (rather than define) an enum 6879 // type, including via an elaborated type specifier. We'll 6880 // diagnose that later; for now, declare the enum in the same 6881 // scope as we would have picked for any other tag type. 6882 // 6883 // GNU C also supports this behavior as part of its incomplete 6884 // enum types extension, while GNU C++ does not. 6885 // 6886 // Find the context where we'll be declaring the tag. 6887 // FIXME: We would like to maintain the current DeclContext as the 6888 // lexical context, 6889 while (SearchDC->isRecord() || SearchDC->isTransparentContext()) 6890 SearchDC = SearchDC->getParent(); 6891 6892 // Find the scope where we'll be declaring the tag. 6893 while (S->isClassScope() || 6894 (getLangOptions().CPlusPlus && 6895 S->isFunctionPrototypeScope()) || 6896 ((S->getFlags() & Scope::DeclScope) == 0) || 6897 (S->getEntity() && 6898 ((DeclContext *)S->getEntity())->isTransparentContext())) 6899 S = S->getParent(); 6900 } else { 6901 assert(TUK == TUK_Friend); 6902 // C++ [namespace.memdef]p3: 6903 // If a friend declaration in a non-local class first declares a 6904 // class or function, the friend class or function is a member of 6905 // the innermost enclosing namespace. 6906 SearchDC = SearchDC->getEnclosingNamespaceContext(); 6907 } 6908 6909 // In C++, we need to do a redeclaration lookup to properly 6910 // diagnose some problems. 6911 if (getLangOptions().CPlusPlus) { 6912 Previous.setRedeclarationKind(ForRedeclaration); 6913 LookupQualifiedName(Previous, SearchDC); 6914 } 6915 } 6916 6917 if (!Previous.empty()) { 6918 NamedDecl *PrevDecl = (*Previous.begin())->getUnderlyingDecl(); 6919 6920 // It's okay to have a tag decl in the same scope as a typedef 6921 // which hides a tag decl in the same scope. Finding this 6922 // insanity with a redeclaration lookup can only actually happen 6923 // in C++. 6924 // 6925 // This is also okay for elaborated-type-specifiers, which is 6926 // technically forbidden by the current standard but which is 6927 // okay according to the likely resolution of an open issue; 6928 // see http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#407 6929 if (getLangOptions().CPlusPlus) { 6930 if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(PrevDecl)) { 6931 if (const TagType *TT = TD->getUnderlyingType()->getAs<TagType>()) { 6932 TagDecl *Tag = TT->getDecl(); 6933 if (Tag->getDeclName() == Name && 6934 Tag->getDeclContext()->getRedeclContext() 6935 ->Equals(TD->getDeclContext()->getRedeclContext())) { 6936 PrevDecl = Tag; 6937 Previous.clear(); 6938 Previous.addDecl(Tag); 6939 Previous.resolveKind(); 6940 } 6941 } 6942 } 6943 } 6944 6945 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 6946 // If this is a use of a previous tag, or if the tag is already declared 6947 // in the same scope (so that the definition/declaration completes or 6948 // rementions the tag), reuse the decl. 6949 if (TUK == TUK_Reference || TUK == TUK_Friend || 6950 isDeclInScope(PrevDecl, SearchDC, S, isExplicitSpecialization)) { 6951 // Make sure that this wasn't declared as an enum and now used as a 6952 // struct or something similar. 6953 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, KWLoc, *Name)) { 6954 bool SafeToContinue 6955 = (PrevTagDecl->getTagKind() != TTK_Enum && 6956 Kind != TTK_Enum); 6957 if (SafeToContinue) 6958 Diag(KWLoc, diag::err_use_with_wrong_tag) 6959 << Name 6960 << FixItHint::CreateReplacement(SourceRange(KWLoc), 6961 PrevTagDecl->getKindName()); 6962 else 6963 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 6964 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 6965 6966 if (SafeToContinue) 6967 Kind = PrevTagDecl->getTagKind(); 6968 else { 6969 // Recover by making this an anonymous redefinition. 6970 Name = 0; 6971 Previous.clear(); 6972 Invalid = true; 6973 } 6974 } 6975 6976 if (Kind == TTK_Enum && PrevTagDecl->getTagKind() == TTK_Enum) { 6977 const EnumDecl *PrevEnum = cast<EnumDecl>(PrevTagDecl); 6978 6979 // All conflicts with previous declarations are recovered by 6980 // returning the previous declaration. 6981 if (ScopedEnum != PrevEnum->isScoped()) { 6982 Diag(KWLoc, diag::err_enum_redeclare_scoped_mismatch) 6983 << PrevEnum->isScoped(); 6984 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 6985 return PrevTagDecl; 6986 } 6987 else if (EnumUnderlying && PrevEnum->isFixed()) { 6988 QualType T; 6989 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 6990 T = TI->getType(); 6991 else 6992 T = QualType(EnumUnderlying.get<const Type*>(), 0); 6993 6994 if (!Context.hasSameUnqualifiedType(T, PrevEnum->getIntegerType())) { 6995 Diag(NameLoc.isValid() ? NameLoc : KWLoc, 6996 diag::err_enum_redeclare_type_mismatch) 6997 << T 6998 << PrevEnum->getIntegerType(); 6999 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7000 return PrevTagDecl; 7001 } 7002 } 7003 else if (!EnumUnderlying.isNull() != PrevEnum->isFixed()) { 7004 Diag(KWLoc, diag::err_enum_redeclare_fixed_mismatch) 7005 << PrevEnum->isFixed(); 7006 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7007 return PrevTagDecl; 7008 } 7009 } 7010 7011 if (!Invalid) { 7012 // If this is a use, just return the declaration we found. 7013 7014 // FIXME: In the future, return a variant or some other clue 7015 // for the consumer of this Decl to know it doesn't own it. 7016 // For our current ASTs this shouldn't be a problem, but will 7017 // need to be changed with DeclGroups. 7018 if ((TUK == TUK_Reference && !PrevTagDecl->getFriendObjectKind()) || 7019 TUK == TUK_Friend) 7020 return PrevTagDecl; 7021 7022 // Diagnose attempts to redefine a tag. 7023 if (TUK == TUK_Definition) { 7024 if (TagDecl *Def = PrevTagDecl->getDefinition()) { 7025 // If we're defining a specialization and the previous definition 7026 // is from an implicit instantiation, don't emit an error 7027 // here; we'll catch this in the general case below. 7028 if (!isExplicitSpecialization || 7029 !isa<CXXRecordDecl>(Def) || 7030 cast<CXXRecordDecl>(Def)->getTemplateSpecializationKind() 7031 == TSK_ExplicitSpecialization) { 7032 Diag(NameLoc, diag::err_redefinition) << Name; 7033 Diag(Def->getLocation(), diag::note_previous_definition); 7034 // If this is a redefinition, recover by making this 7035 // struct be anonymous, which will make any later 7036 // references get the previous definition. 7037 Name = 0; 7038 Previous.clear(); 7039 Invalid = true; 7040 } 7041 } else { 7042 // If the type is currently being defined, complain 7043 // about a nested redefinition. 7044 const TagType *Tag 7045 = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 7046 if (Tag->isBeingDefined()) { 7047 Diag(NameLoc, diag::err_nested_redefinition) << Name; 7048 Diag(PrevTagDecl->getLocation(), 7049 diag::note_previous_definition); 7050 Name = 0; 7051 Previous.clear(); 7052 Invalid = true; 7053 } 7054 } 7055 7056 // Okay, this is definition of a previously declared or referenced 7057 // tag PrevDecl. We're going to create a new Decl for it. 7058 } 7059 } 7060 // If we get here we have (another) forward declaration or we 7061 // have a definition. Just create a new decl. 7062 7063 } else { 7064 // If we get here, this is a definition of a new tag type in a nested 7065 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 7066 // new decl/type. We set PrevDecl to NULL so that the entities 7067 // have distinct types. 7068 Previous.clear(); 7069 } 7070 // If we get here, we're going to create a new Decl. If PrevDecl 7071 // is non-NULL, it's a definition of the tag declared by 7072 // PrevDecl. If it's NULL, we have a new definition. 7073 7074 7075 // Otherwise, PrevDecl is not a tag, but was found with tag 7076 // lookup. This is only actually possible in C++, where a few 7077 // things like templates still live in the tag namespace. 7078 } else { 7079 assert(getLangOptions().CPlusPlus); 7080 7081 // Use a better diagnostic if an elaborated-type-specifier 7082 // found the wrong kind of type on the first 7083 // (non-redeclaration) lookup. 7084 if ((TUK == TUK_Reference || TUK == TUK_Friend) && 7085 !Previous.isForRedeclaration()) { 7086 unsigned Kind = 0; 7087 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 7088 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 7089 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 7090 Diag(NameLoc, diag::err_tag_reference_non_tag) << Kind; 7091 Diag(PrevDecl->getLocation(), diag::note_declared_at); 7092 Invalid = true; 7093 7094 // Otherwise, only diagnose if the declaration is in scope. 7095 } else if (!isDeclInScope(PrevDecl, SearchDC, S, 7096 isExplicitSpecialization)) { 7097 // do nothing 7098 7099 // Diagnose implicit declarations introduced by elaborated types. 7100 } else if (TUK == TUK_Reference || TUK == TUK_Friend) { 7101 unsigned Kind = 0; 7102 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 7103 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 7104 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 7105 Diag(NameLoc, diag::err_tag_reference_conflict) << Kind; 7106 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 7107 Invalid = true; 7108 7109 // Otherwise it's a declaration. Call out a particularly common 7110 // case here. 7111 } else if (TypedefNameDecl *TND = dyn_cast<TypedefNameDecl>(PrevDecl)) { 7112 unsigned Kind = 0; 7113 if (isa<TypeAliasDecl>(PrevDecl)) Kind = 1; 7114 Diag(NameLoc, diag::err_tag_definition_of_typedef) 7115 << Name << Kind << TND->getUnderlyingType(); 7116 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 7117 Invalid = true; 7118 7119 // Otherwise, diagnose. 7120 } else { 7121 // The tag name clashes with something else in the target scope, 7122 // issue an error and recover by making this tag be anonymous. 7123 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 7124 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 7125 Name = 0; 7126 Invalid = true; 7127 } 7128 7129 // The existing declaration isn't relevant to us; we're in a 7130 // new scope, so clear out the previous declaration. 7131 Previous.clear(); 7132 } 7133 } 7134 7135CreateNewDecl: 7136 7137 TagDecl *PrevDecl = 0; 7138 if (Previous.isSingleResult()) 7139 PrevDecl = cast<TagDecl>(Previous.getFoundDecl()); 7140 7141 // If there is an identifier, use the location of the identifier as the 7142 // location of the decl, otherwise use the location of the struct/union 7143 // keyword. 7144 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 7145 7146 // Otherwise, create a new declaration. If there is a previous 7147 // declaration of the same entity, the two will be linked via 7148 // PrevDecl. 7149 TagDecl *New; 7150 7151 bool IsForwardReference = false; 7152 if (Kind == TTK_Enum) { 7153 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 7154 // enum X { A, B, C } D; D should chain to X. 7155 New = EnumDecl::Create(Context, SearchDC, KWLoc, Loc, Name, 7156 cast_or_null<EnumDecl>(PrevDecl), ScopedEnum, 7157 ScopedEnumUsesClassTag, !EnumUnderlying.isNull()); 7158 // If this is an undefined enum, warn. 7159 if (TUK != TUK_Definition && !Invalid) { 7160 TagDecl *Def; 7161 if (getLangOptions().CPlusPlus0x && cast<EnumDecl>(New)->isFixed()) { 7162 // C++0x: 7.2p2: opaque-enum-declaration. 7163 // Conflicts are diagnosed above. Do nothing. 7164 } 7165 else if (PrevDecl && (Def = cast<EnumDecl>(PrevDecl)->getDefinition())) { 7166 Diag(Loc, diag::ext_forward_ref_enum_def) 7167 << New; 7168 Diag(Def->getLocation(), diag::note_previous_definition); 7169 } else { 7170 unsigned DiagID = diag::ext_forward_ref_enum; 7171 if (getLangOptions().Microsoft) 7172 DiagID = diag::ext_ms_forward_ref_enum; 7173 else if (getLangOptions().CPlusPlus) 7174 DiagID = diag::err_forward_ref_enum; 7175 Diag(Loc, DiagID); 7176 7177 // If this is a forward-declared reference to an enumeration, make a 7178 // note of it; we won't actually be introducing the declaration into 7179 // the declaration context. 7180 if (TUK == TUK_Reference) 7181 IsForwardReference = true; 7182 } 7183 } 7184 7185 if (EnumUnderlying) { 7186 EnumDecl *ED = cast<EnumDecl>(New); 7187 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 7188 ED->setIntegerTypeSourceInfo(TI); 7189 else 7190 ED->setIntegerType(QualType(EnumUnderlying.get<const Type*>(), 0)); 7191 ED->setPromotionType(ED->getIntegerType()); 7192 } 7193 7194 } else { 7195 // struct/union/class 7196 7197 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 7198 // struct X { int A; } D; D should chain to X. 7199 if (getLangOptions().CPlusPlus) { 7200 // FIXME: Look for a way to use RecordDecl for simple structs. 7201 New = CXXRecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 7202 cast_or_null<CXXRecordDecl>(PrevDecl)); 7203 7204 if (isStdBadAlloc && (!StdBadAlloc || getStdBadAlloc()->isImplicit())) 7205 StdBadAlloc = cast<CXXRecordDecl>(New); 7206 } else 7207 New = RecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 7208 cast_or_null<RecordDecl>(PrevDecl)); 7209 } 7210 7211 // Maybe add qualifier info. 7212 if (SS.isNotEmpty()) { 7213 if (SS.isSet()) { 7214 New->setQualifierInfo(SS.getWithLocInContext(Context)); 7215 if (TemplateParameterLists.size() > 0) { 7216 New->setTemplateParameterListsInfo(Context, 7217 TemplateParameterLists.size(), 7218 (TemplateParameterList**) TemplateParameterLists.release()); 7219 } 7220 } 7221 else 7222 Invalid = true; 7223 } 7224 7225 if (RecordDecl *RD = dyn_cast<RecordDecl>(New)) { 7226 // Add alignment attributes if necessary; these attributes are checked when 7227 // the ASTContext lays out the structure. 7228 // 7229 // It is important for implementing the correct semantics that this 7230 // happen here (in act on tag decl). The #pragma pack stack is 7231 // maintained as a result of parser callbacks which can occur at 7232 // many points during the parsing of a struct declaration (because 7233 // the #pragma tokens are effectively skipped over during the 7234 // parsing of the struct). 7235 AddAlignmentAttributesForRecord(RD); 7236 7237 AddMsStructLayoutForRecord(RD); 7238 } 7239 7240 // If this is a specialization of a member class (of a class template), 7241 // check the specialization. 7242 if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous)) 7243 Invalid = true; 7244 7245 if (Invalid) 7246 New->setInvalidDecl(); 7247 7248 if (Attr) 7249 ProcessDeclAttributeList(S, New, Attr); 7250 7251 // If we're declaring or defining a tag in function prototype scope 7252 // in C, note that this type can only be used within the function. 7253 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 7254 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 7255 7256 // Set the lexical context. If the tag has a C++ scope specifier, the 7257 // lexical context will be different from the semantic context. 7258 New->setLexicalDeclContext(CurContext); 7259 7260 // Mark this as a friend decl if applicable. 7261 if (TUK == TUK_Friend) 7262 New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ !Previous.empty()); 7263 7264 // Set the access specifier. 7265 if (!Invalid && SearchDC->isRecord()) 7266 SetMemberAccessSpecifier(New, PrevDecl, AS); 7267 7268 if (TUK == TUK_Definition) 7269 New->startDefinition(); 7270 7271 // If this has an identifier, add it to the scope stack. 7272 if (TUK == TUK_Friend) { 7273 // We might be replacing an existing declaration in the lookup tables; 7274 // if so, borrow its access specifier. 7275 if (PrevDecl) 7276 New->setAccess(PrevDecl->getAccess()); 7277 7278 DeclContext *DC = New->getDeclContext()->getRedeclContext(); 7279 DC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 7280 if (Name) // can be null along some error paths 7281 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 7282 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false); 7283 } else if (Name) { 7284 S = getNonFieldDeclScope(S); 7285 PushOnScopeChains(New, S, !IsForwardReference); 7286 if (IsForwardReference) 7287 SearchDC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 7288 7289 } else { 7290 CurContext->addDecl(New); 7291 } 7292 7293 // If this is the C FILE type, notify the AST context. 7294 if (IdentifierInfo *II = New->getIdentifier()) 7295 if (!New->isInvalidDecl() && 7296 New->getDeclContext()->getRedeclContext()->isTranslationUnit() && 7297 II->isStr("FILE")) 7298 Context.setFILEDecl(New); 7299 7300 OwnedDecl = true; 7301 return New; 7302} 7303 7304void Sema::ActOnTagStartDefinition(Scope *S, Decl *TagD) { 7305 AdjustDeclIfTemplate(TagD); 7306 TagDecl *Tag = cast<TagDecl>(TagD); 7307 7308 // Enter the tag context. 7309 PushDeclContext(S, Tag); 7310} 7311 7312void Sema::ActOnStartCXXMemberDeclarations(Scope *S, Decl *TagD, 7313 SourceLocation FinalLoc, 7314 SourceLocation LBraceLoc) { 7315 AdjustDeclIfTemplate(TagD); 7316 CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD); 7317 7318 FieldCollector->StartClass(); 7319 7320 if (!Record->getIdentifier()) 7321 return; 7322 7323 if (FinalLoc.isValid()) 7324 Record->addAttr(new (Context) FinalAttr(FinalLoc, Context)); 7325 7326 // C++ [class]p2: 7327 // [...] The class-name is also inserted into the scope of the 7328 // class itself; this is known as the injected-class-name. For 7329 // purposes of access checking, the injected-class-name is treated 7330 // as if it were a public member name. 7331 CXXRecordDecl *InjectedClassName 7332 = CXXRecordDecl::Create(Context, Record->getTagKind(), CurContext, 7333 Record->getLocStart(), Record->getLocation(), 7334 Record->getIdentifier(), 7335 /*PrevDecl=*/0, 7336 /*DelayTypeCreation=*/true); 7337 Context.getTypeDeclType(InjectedClassName, Record); 7338 InjectedClassName->setImplicit(); 7339 InjectedClassName->setAccess(AS_public); 7340 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 7341 InjectedClassName->setDescribedClassTemplate(Template); 7342 PushOnScopeChains(InjectedClassName, S); 7343 assert(InjectedClassName->isInjectedClassName() && 7344 "Broken injected-class-name"); 7345} 7346 7347void Sema::ActOnTagFinishDefinition(Scope *S, Decl *TagD, 7348 SourceLocation RBraceLoc) { 7349 AdjustDeclIfTemplate(TagD); 7350 TagDecl *Tag = cast<TagDecl>(TagD); 7351 Tag->setRBraceLoc(RBraceLoc); 7352 7353 if (isa<CXXRecordDecl>(Tag)) 7354 FieldCollector->FinishClass(); 7355 7356 // Exit this scope of this tag's definition. 7357 PopDeclContext(); 7358 7359 // Notify the consumer that we've defined a tag. 7360 Consumer.HandleTagDeclDefinition(Tag); 7361} 7362 7363void Sema::ActOnTagDefinitionError(Scope *S, Decl *TagD) { 7364 AdjustDeclIfTemplate(TagD); 7365 TagDecl *Tag = cast<TagDecl>(TagD); 7366 Tag->setInvalidDecl(); 7367 7368 // We're undoing ActOnTagStartDefinition here, not 7369 // ActOnStartCXXMemberDeclarations, so we don't have to mess with 7370 // the FieldCollector. 7371 7372 PopDeclContext(); 7373} 7374 7375// Note that FieldName may be null for anonymous bitfields. 7376bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName, 7377 QualType FieldTy, const Expr *BitWidth, 7378 bool *ZeroWidth) { 7379 // Default to true; that shouldn't confuse checks for emptiness 7380 if (ZeroWidth) 7381 *ZeroWidth = true; 7382 7383 // C99 6.7.2.1p4 - verify the field type. 7384 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 7385 if (!FieldTy->isDependentType() && !FieldTy->isIntegralOrEnumerationType()) { 7386 // Handle incomplete types with specific error. 7387 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 7388 return true; 7389 if (FieldName) 7390 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 7391 << FieldName << FieldTy << BitWidth->getSourceRange(); 7392 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) 7393 << FieldTy << BitWidth->getSourceRange(); 7394 } else if (DiagnoseUnexpandedParameterPack(const_cast<Expr *>(BitWidth), 7395 UPPC_BitFieldWidth)) 7396 return true; 7397 7398 // If the bit-width is type- or value-dependent, don't try to check 7399 // it now. 7400 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 7401 return false; 7402 7403 llvm::APSInt Value; 7404 if (VerifyIntegerConstantExpression(BitWidth, &Value)) 7405 return true; 7406 7407 if (Value != 0 && ZeroWidth) 7408 *ZeroWidth = false; 7409 7410 // Zero-width bitfield is ok for anonymous field. 7411 if (Value == 0 && FieldName) 7412 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 7413 7414 if (Value.isSigned() && Value.isNegative()) { 7415 if (FieldName) 7416 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 7417 << FieldName << Value.toString(10); 7418 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) 7419 << Value.toString(10); 7420 } 7421 7422 if (!FieldTy->isDependentType()) { 7423 uint64_t TypeSize = Context.getTypeSize(FieldTy); 7424 if (Value.getZExtValue() > TypeSize) { 7425 if (!getLangOptions().CPlusPlus) { 7426 if (FieldName) 7427 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 7428 << FieldName << (unsigned)Value.getZExtValue() 7429 << (unsigned)TypeSize; 7430 7431 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) 7432 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 7433 } 7434 7435 if (FieldName) 7436 Diag(FieldLoc, diag::warn_bitfield_width_exceeds_type_size) 7437 << FieldName << (unsigned)Value.getZExtValue() 7438 << (unsigned)TypeSize; 7439 else 7440 Diag(FieldLoc, diag::warn_anon_bitfield_width_exceeds_type_size) 7441 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 7442 } 7443 } 7444 7445 return false; 7446} 7447 7448/// ActOnField - Each field of a struct/union/class is passed into this in order 7449/// to create a FieldDecl object for it. 7450Decl *Sema::ActOnField(Scope *S, Decl *TagD, 7451 SourceLocation DeclStart, 7452 Declarator &D, ExprTy *BitfieldWidth) { 7453 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD), 7454 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 7455 AS_public); 7456 return Res; 7457} 7458 7459/// HandleField - Analyze a field of a C struct or a C++ data member. 7460/// 7461FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 7462 SourceLocation DeclStart, 7463 Declarator &D, Expr *BitWidth, 7464 AccessSpecifier AS) { 7465 IdentifierInfo *II = D.getIdentifier(); 7466 SourceLocation Loc = DeclStart; 7467 if (II) Loc = D.getIdentifierLoc(); 7468 7469 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 7470 QualType T = TInfo->getType(); 7471 if (getLangOptions().CPlusPlus) { 7472 CheckExtraCXXDefaultArguments(D); 7473 7474 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 7475 UPPC_DataMemberType)) { 7476 D.setInvalidType(); 7477 T = Context.IntTy; 7478 TInfo = Context.getTrivialTypeSourceInfo(T, Loc); 7479 } 7480 } 7481 7482 DiagnoseFunctionSpecifiers(D); 7483 7484 if (D.getDeclSpec().isThreadSpecified()) 7485 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 7486 7487 // Check to see if this name was declared as a member previously 7488 LookupResult Previous(*this, II, Loc, LookupMemberName, ForRedeclaration); 7489 LookupName(Previous, S); 7490 assert((Previous.empty() || Previous.isOverloadedResult() || 7491 Previous.isSingleResult()) 7492 && "Lookup of member name should be either overloaded, single or null"); 7493 7494 // If the name is overloaded then get any declaration else get the single result 7495 NamedDecl *PrevDecl = Previous.isOverloadedResult() ? 7496 Previous.getRepresentativeDecl() : Previous.getAsSingle<NamedDecl>(); 7497 7498 if (PrevDecl && PrevDecl->isTemplateParameter()) { 7499 // Maybe we will complain about the shadowed template parameter. 7500 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 7501 // Just pretend that we didn't see the previous declaration. 7502 PrevDecl = 0; 7503 } 7504 7505 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 7506 PrevDecl = 0; 7507 7508 bool Mutable 7509 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable); 7510 SourceLocation TSSL = D.getSourceRange().getBegin(); 7511 FieldDecl *NewFD 7512 = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, TSSL, 7513 AS, PrevDecl, &D); 7514 7515 if (NewFD->isInvalidDecl()) 7516 Record->setInvalidDecl(); 7517 7518 if (NewFD->isInvalidDecl() && PrevDecl) { 7519 // Don't introduce NewFD into scope; there's already something 7520 // with the same name in the same scope. 7521 } else if (II) { 7522 PushOnScopeChains(NewFD, S); 7523 } else 7524 Record->addDecl(NewFD); 7525 7526 return NewFD; 7527} 7528 7529/// \brief Build a new FieldDecl and check its well-formedness. 7530/// 7531/// This routine builds a new FieldDecl given the fields name, type, 7532/// record, etc. \p PrevDecl should refer to any previous declaration 7533/// with the same name and in the same scope as the field to be 7534/// created. 7535/// 7536/// \returns a new FieldDecl. 7537/// 7538/// \todo The Declarator argument is a hack. It will be removed once 7539FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 7540 TypeSourceInfo *TInfo, 7541 RecordDecl *Record, SourceLocation Loc, 7542 bool Mutable, Expr *BitWidth, 7543 SourceLocation TSSL, 7544 AccessSpecifier AS, NamedDecl *PrevDecl, 7545 Declarator *D) { 7546 IdentifierInfo *II = Name.getAsIdentifierInfo(); 7547 bool InvalidDecl = false; 7548 if (D) InvalidDecl = D->isInvalidType(); 7549 7550 // If we receive a broken type, recover by assuming 'int' and 7551 // marking this declaration as invalid. 7552 if (T.isNull()) { 7553 InvalidDecl = true; 7554 T = Context.IntTy; 7555 } 7556 7557 QualType EltTy = Context.getBaseElementType(T); 7558 if (!EltTy->isDependentType() && 7559 RequireCompleteType(Loc, EltTy, diag::err_field_incomplete)) { 7560 // Fields of incomplete type force their record to be invalid. 7561 Record->setInvalidDecl(); 7562 InvalidDecl = true; 7563 } 7564 7565 // C99 6.7.2.1p8: A member of a structure or union may have any type other 7566 // than a variably modified type. 7567 if (!InvalidDecl && T->isVariablyModifiedType()) { 7568 bool SizeIsNegative; 7569 llvm::APSInt Oversized; 7570 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 7571 SizeIsNegative, 7572 Oversized); 7573 if (!FixedTy.isNull()) { 7574 Diag(Loc, diag::warn_illegal_constant_array_size); 7575 T = FixedTy; 7576 } else { 7577 if (SizeIsNegative) 7578 Diag(Loc, diag::err_typecheck_negative_array_size); 7579 else if (Oversized.getBoolValue()) 7580 Diag(Loc, diag::err_array_too_large) 7581 << Oversized.toString(10); 7582 else 7583 Diag(Loc, diag::err_typecheck_field_variable_size); 7584 InvalidDecl = true; 7585 } 7586 } 7587 7588 // Fields can not have abstract class types 7589 if (!InvalidDecl && RequireNonAbstractType(Loc, T, 7590 diag::err_abstract_type_in_decl, 7591 AbstractFieldType)) 7592 InvalidDecl = true; 7593 7594 bool ZeroWidth = false; 7595 // If this is declared as a bit-field, check the bit-field. 7596 if (!InvalidDecl && BitWidth && 7597 VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth)) { 7598 InvalidDecl = true; 7599 BitWidth = 0; 7600 ZeroWidth = false; 7601 } 7602 7603 // Check that 'mutable' is consistent with the type of the declaration. 7604 if (!InvalidDecl && Mutable) { 7605 unsigned DiagID = 0; 7606 if (T->isReferenceType()) 7607 DiagID = diag::err_mutable_reference; 7608 else if (T.isConstQualified()) 7609 DiagID = diag::err_mutable_const; 7610 7611 if (DiagID) { 7612 SourceLocation ErrLoc = Loc; 7613 if (D && D->getDeclSpec().getStorageClassSpecLoc().isValid()) 7614 ErrLoc = D->getDeclSpec().getStorageClassSpecLoc(); 7615 Diag(ErrLoc, DiagID); 7616 Mutable = false; 7617 InvalidDecl = true; 7618 } 7619 } 7620 7621 FieldDecl *NewFD = FieldDecl::Create(Context, Record, TSSL, Loc, II, T, TInfo, 7622 BitWidth, Mutable); 7623 if (InvalidDecl) 7624 NewFD->setInvalidDecl(); 7625 7626 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 7627 Diag(Loc, diag::err_duplicate_member) << II; 7628 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 7629 NewFD->setInvalidDecl(); 7630 } 7631 7632 if (!InvalidDecl && getLangOptions().CPlusPlus) { 7633 if (Record->isUnion()) { 7634 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 7635 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 7636 if (RDecl->getDefinition()) { 7637 // C++ [class.union]p1: An object of a class with a non-trivial 7638 // constructor, a non-trivial copy constructor, a non-trivial 7639 // destructor, or a non-trivial copy assignment operator 7640 // cannot be a member of a union, nor can an array of such 7641 // objects. 7642 if (!getLangOptions().CPlusPlus0x && CheckNontrivialField(NewFD)) 7643 NewFD->setInvalidDecl(); 7644 } 7645 } 7646 7647 // C++ [class.union]p1: If a union contains a member of reference type, 7648 // the program is ill-formed. 7649 if (EltTy->isReferenceType()) { 7650 Diag(NewFD->getLocation(), diag::err_union_member_of_reference_type) 7651 << NewFD->getDeclName() << EltTy; 7652 NewFD->setInvalidDecl(); 7653 } 7654 } 7655 } 7656 7657 // FIXME: We need to pass in the attributes given an AST 7658 // representation, not a parser representation. 7659 if (D) 7660 // FIXME: What to pass instead of TUScope? 7661 ProcessDeclAttributes(TUScope, NewFD, *D); 7662 7663 if (T.isObjCGCWeak()) 7664 Diag(Loc, diag::warn_attribute_weak_on_field); 7665 7666 NewFD->setAccess(AS); 7667 return NewFD; 7668} 7669 7670bool Sema::CheckNontrivialField(FieldDecl *FD) { 7671 assert(FD); 7672 assert(getLangOptions().CPlusPlus && "valid check only for C++"); 7673 7674 if (FD->isInvalidDecl()) 7675 return true; 7676 7677 QualType EltTy = Context.getBaseElementType(FD->getType()); 7678 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 7679 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 7680 if (RDecl->getDefinition()) { 7681 // We check for copy constructors before constructors 7682 // because otherwise we'll never get complaints about 7683 // copy constructors. 7684 7685 CXXSpecialMember member = CXXInvalid; 7686 if (!RDecl->hasTrivialCopyConstructor()) 7687 member = CXXCopyConstructor; 7688 else if (!RDecl->hasTrivialDefaultConstructor()) 7689 member = CXXDefaultConstructor; 7690 else if (!RDecl->hasTrivialCopyAssignment()) 7691 member = CXXCopyAssignment; 7692 else if (!RDecl->hasTrivialDestructor()) 7693 member = CXXDestructor; 7694 7695 if (member != CXXInvalid) { 7696 Diag(FD->getLocation(), diag::err_illegal_union_or_anon_struct_member) 7697 << (int)FD->getParent()->isUnion() << FD->getDeclName() << member; 7698 DiagnoseNontrivial(RT, member); 7699 return true; 7700 } 7701 } 7702 } 7703 7704 return false; 7705} 7706 7707/// DiagnoseNontrivial - Given that a class has a non-trivial 7708/// special member, figure out why. 7709void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) { 7710 QualType QT(T, 0U); 7711 CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl()); 7712 7713 // Check whether the member was user-declared. 7714 switch (member) { 7715 case CXXInvalid: 7716 break; 7717 7718 case CXXDefaultConstructor: 7719 if (RD->hasUserDeclaredConstructor()) { 7720 typedef CXXRecordDecl::ctor_iterator ctor_iter; 7721 for (ctor_iter ci = RD->ctor_begin(), ce = RD->ctor_end(); ci != ce;++ci){ 7722 const FunctionDecl *body = 0; 7723 ci->hasBody(body); 7724 if (!body || !cast<CXXConstructorDecl>(body)->isImplicitlyDefined()) { 7725 SourceLocation CtorLoc = ci->getLocation(); 7726 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 7727 return; 7728 } 7729 } 7730 7731 assert(0 && "found no user-declared constructors"); 7732 return; 7733 } 7734 break; 7735 7736 case CXXCopyConstructor: 7737 if (RD->hasUserDeclaredCopyConstructor()) { 7738 SourceLocation CtorLoc = 7739 RD->getCopyConstructor(Context, 0)->getLocation(); 7740 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 7741 return; 7742 } 7743 break; 7744 7745 case CXXCopyAssignment: 7746 if (RD->hasUserDeclaredCopyAssignment()) { 7747 // FIXME: this should use the location of the copy 7748 // assignment, not the type. 7749 SourceLocation TyLoc = RD->getSourceRange().getBegin(); 7750 Diag(TyLoc, diag::note_nontrivial_user_defined) << QT << member; 7751 return; 7752 } 7753 break; 7754 7755 case CXXDestructor: 7756 if (RD->hasUserDeclaredDestructor()) { 7757 SourceLocation DtorLoc = LookupDestructor(RD)->getLocation(); 7758 Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member; 7759 return; 7760 } 7761 break; 7762 } 7763 7764 typedef CXXRecordDecl::base_class_iterator base_iter; 7765 7766 // Virtual bases and members inhibit trivial copying/construction, 7767 // but not trivial destruction. 7768 if (member != CXXDestructor) { 7769 // Check for virtual bases. vbases includes indirect virtual bases, 7770 // so we just iterate through the direct bases. 7771 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) 7772 if (bi->isVirtual()) { 7773 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 7774 Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1; 7775 return; 7776 } 7777 7778 // Check for virtual methods. 7779 typedef CXXRecordDecl::method_iterator meth_iter; 7780 for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me; 7781 ++mi) { 7782 if (mi->isVirtual()) { 7783 SourceLocation MLoc = mi->getSourceRange().getBegin(); 7784 Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0; 7785 return; 7786 } 7787 } 7788 } 7789 7790 bool (CXXRecordDecl::*hasTrivial)() const; 7791 switch (member) { 7792 case CXXDefaultConstructor: 7793 hasTrivial = &CXXRecordDecl::hasTrivialDefaultConstructor; break; 7794 case CXXCopyConstructor: 7795 hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break; 7796 case CXXCopyAssignment: 7797 hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break; 7798 case CXXDestructor: 7799 hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break; 7800 default: 7801 assert(0 && "unexpected special member"); return; 7802 } 7803 7804 // Check for nontrivial bases (and recurse). 7805 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) { 7806 const RecordType *BaseRT = bi->getType()->getAs<RecordType>(); 7807 assert(BaseRT && "Don't know how to handle dependent bases"); 7808 CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl()); 7809 if (!(BaseRecTy->*hasTrivial)()) { 7810 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 7811 Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member; 7812 DiagnoseNontrivial(BaseRT, member); 7813 return; 7814 } 7815 } 7816 7817 // Check for nontrivial members (and recurse). 7818 typedef RecordDecl::field_iterator field_iter; 7819 for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe; 7820 ++fi) { 7821 QualType EltTy = Context.getBaseElementType((*fi)->getType()); 7822 if (const RecordType *EltRT = EltTy->getAs<RecordType>()) { 7823 CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl()); 7824 7825 if (!(EltRD->*hasTrivial)()) { 7826 SourceLocation FLoc = (*fi)->getLocation(); 7827 Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member; 7828 DiagnoseNontrivial(EltRT, member); 7829 return; 7830 } 7831 } 7832 } 7833 7834 assert(0 && "found no explanation for non-trivial member"); 7835} 7836 7837/// TranslateIvarVisibility - Translate visibility from a token ID to an 7838/// AST enum value. 7839static ObjCIvarDecl::AccessControl 7840TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 7841 switch (ivarVisibility) { 7842 default: assert(0 && "Unknown visitibility kind"); 7843 case tok::objc_private: return ObjCIvarDecl::Private; 7844 case tok::objc_public: return ObjCIvarDecl::Public; 7845 case tok::objc_protected: return ObjCIvarDecl::Protected; 7846 case tok::objc_package: return ObjCIvarDecl::Package; 7847 } 7848} 7849 7850/// ActOnIvar - Each ivar field of an objective-c class is passed into this 7851/// in order to create an IvarDecl object for it. 7852Decl *Sema::ActOnIvar(Scope *S, 7853 SourceLocation DeclStart, 7854 Decl *IntfDecl, 7855 Declarator &D, ExprTy *BitfieldWidth, 7856 tok::ObjCKeywordKind Visibility) { 7857 7858 IdentifierInfo *II = D.getIdentifier(); 7859 Expr *BitWidth = (Expr*)BitfieldWidth; 7860 SourceLocation Loc = DeclStart; 7861 if (II) Loc = D.getIdentifierLoc(); 7862 7863 // FIXME: Unnamed fields can be handled in various different ways, for 7864 // example, unnamed unions inject all members into the struct namespace! 7865 7866 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 7867 QualType T = TInfo->getType(); 7868 7869 if (BitWidth) { 7870 // 6.7.2.1p3, 6.7.2.1p4 7871 if (VerifyBitField(Loc, II, T, BitWidth)) { 7872 D.setInvalidType(); 7873 BitWidth = 0; 7874 } 7875 } else { 7876 // Not a bitfield. 7877 7878 // validate II. 7879 7880 } 7881 if (T->isReferenceType()) { 7882 Diag(Loc, diag::err_ivar_reference_type); 7883 D.setInvalidType(); 7884 } 7885 // C99 6.7.2.1p8: A member of a structure or union may have any type other 7886 // than a variably modified type. 7887 else if (T->isVariablyModifiedType()) { 7888 Diag(Loc, diag::err_typecheck_ivar_variable_size); 7889 D.setInvalidType(); 7890 } 7891 7892 // Get the visibility (access control) for this ivar. 7893 ObjCIvarDecl::AccessControl ac = 7894 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 7895 : ObjCIvarDecl::None; 7896 // Must set ivar's DeclContext to its enclosing interface. 7897 ObjCContainerDecl *EnclosingDecl = cast<ObjCContainerDecl>(IntfDecl); 7898 ObjCContainerDecl *EnclosingContext; 7899 if (ObjCImplementationDecl *IMPDecl = 7900 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 7901 if (!LangOpts.ObjCNonFragileABI2) { 7902 // Case of ivar declared in an implementation. Context is that of its class. 7903 EnclosingContext = IMPDecl->getClassInterface(); 7904 assert(EnclosingContext && "Implementation has no class interface!"); 7905 } 7906 else 7907 EnclosingContext = EnclosingDecl; 7908 } else { 7909 if (ObjCCategoryDecl *CDecl = 7910 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 7911 if (!LangOpts.ObjCNonFragileABI2 || !CDecl->IsClassExtension()) { 7912 Diag(Loc, diag::err_misplaced_ivar) << CDecl->IsClassExtension(); 7913 return 0; 7914 } 7915 } 7916 EnclosingContext = EnclosingDecl; 7917 } 7918 7919 // Construct the decl. 7920 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, EnclosingContext, 7921 DeclStart, Loc, II, T, 7922 TInfo, ac, (Expr *)BitfieldWidth); 7923 7924 if (II) { 7925 NamedDecl *PrevDecl = LookupSingleName(S, II, Loc, LookupMemberName, 7926 ForRedeclaration); 7927 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S) 7928 && !isa<TagDecl>(PrevDecl)) { 7929 Diag(Loc, diag::err_duplicate_member) << II; 7930 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 7931 NewID->setInvalidDecl(); 7932 } 7933 } 7934 7935 // Process attributes attached to the ivar. 7936 ProcessDeclAttributes(S, NewID, D); 7937 7938 if (D.isInvalidType()) 7939 NewID->setInvalidDecl(); 7940 7941 if (II) { 7942 // FIXME: When interfaces are DeclContexts, we'll need to add 7943 // these to the interface. 7944 S->AddDecl(NewID); 7945 IdResolver.AddDecl(NewID); 7946 } 7947 7948 return NewID; 7949} 7950 7951/// ActOnLastBitfield - This routine handles synthesized bitfields rules for 7952/// class and class extensions. For every class @interface and class 7953/// extension @interface, if the last ivar is a bitfield of any type, 7954/// then add an implicit `char :0` ivar to the end of that interface. 7955void Sema::ActOnLastBitfield(SourceLocation DeclLoc, Decl *EnclosingDecl, 7956 llvm::SmallVectorImpl<Decl *> &AllIvarDecls) { 7957 if (!LangOpts.ObjCNonFragileABI2 || AllIvarDecls.empty()) 7958 return; 7959 7960 Decl *ivarDecl = AllIvarDecls[AllIvarDecls.size()-1]; 7961 ObjCIvarDecl *Ivar = cast<ObjCIvarDecl>(ivarDecl); 7962 7963 if (!Ivar->isBitField()) 7964 return; 7965 uint64_t BitFieldSize = 7966 Ivar->getBitWidth()->EvaluateAsInt(Context).getZExtValue(); 7967 if (BitFieldSize == 0) 7968 return; 7969 ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl); 7970 if (!ID) { 7971 if (ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 7972 if (!CD->IsClassExtension()) 7973 return; 7974 } 7975 // No need to add this to end of @implementation. 7976 else 7977 return; 7978 } 7979 // All conditions are met. Add a new bitfield to the tail end of ivars. 7980 llvm::APInt Zero(Context.getTypeSize(Context.CharTy), 0); 7981 Expr * BW = IntegerLiteral::Create(Context, Zero, Context.CharTy, DeclLoc); 7982 7983 Ivar = ObjCIvarDecl::Create(Context, cast<ObjCContainerDecl>(EnclosingDecl), 7984 DeclLoc, DeclLoc, 0, 7985 Context.CharTy, 7986 Context.CreateTypeSourceInfo(Context.CharTy), 7987 ObjCIvarDecl::Private, BW, 7988 true); 7989 AllIvarDecls.push_back(Ivar); 7990} 7991 7992void Sema::ActOnFields(Scope* S, 7993 SourceLocation RecLoc, Decl *EnclosingDecl, 7994 Decl **Fields, unsigned NumFields, 7995 SourceLocation LBrac, SourceLocation RBrac, 7996 AttributeList *Attr) { 7997 assert(EnclosingDecl && "missing record or interface decl"); 7998 7999 // If the decl this is being inserted into is invalid, then it may be a 8000 // redeclaration or some other bogus case. Don't try to add fields to it. 8001 if (EnclosingDecl->isInvalidDecl()) { 8002 // FIXME: Deallocate fields? 8003 return; 8004 } 8005 8006 8007 // Verify that all the fields are okay. 8008 unsigned NumNamedMembers = 0; 8009 llvm::SmallVector<FieldDecl*, 32> RecFields; 8010 8011 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 8012 for (unsigned i = 0; i != NumFields; ++i) { 8013 FieldDecl *FD = cast<FieldDecl>(Fields[i]); 8014 8015 // Get the type for the field. 8016 const Type *FDTy = FD->getType().getTypePtr(); 8017 8018 if (!FD->isAnonymousStructOrUnion()) { 8019 // Remember all fields written by the user. 8020 RecFields.push_back(FD); 8021 } 8022 8023 // If the field is already invalid for some reason, don't emit more 8024 // diagnostics about it. 8025 if (FD->isInvalidDecl()) { 8026 EnclosingDecl->setInvalidDecl(); 8027 continue; 8028 } 8029 8030 // C99 6.7.2.1p2: 8031 // A structure or union shall not contain a member with 8032 // incomplete or function type (hence, a structure shall not 8033 // contain an instance of itself, but may contain a pointer to 8034 // an instance of itself), except that the last member of a 8035 // structure with more than one named member may have incomplete 8036 // array type; such a structure (and any union containing, 8037 // possibly recursively, a member that is such a structure) 8038 // shall not be a member of a structure or an element of an 8039 // array. 8040 if (FDTy->isFunctionType()) { 8041 // Field declared as a function. 8042 Diag(FD->getLocation(), diag::err_field_declared_as_function) 8043 << FD->getDeclName(); 8044 FD->setInvalidDecl(); 8045 EnclosingDecl->setInvalidDecl(); 8046 continue; 8047 } else if (FDTy->isIncompleteArrayType() && Record && 8048 ((i == NumFields - 1 && !Record->isUnion()) || 8049 ((getLangOptions().Microsoft || getLangOptions().CPlusPlus) && 8050 (i == NumFields - 1 || Record->isUnion())))) { 8051 // Flexible array member. 8052 // Microsoft and g++ is more permissive regarding flexible array. 8053 // It will accept flexible array in union and also 8054 // as the sole element of a struct/class. 8055 if (getLangOptions().Microsoft) { 8056 if (Record->isUnion()) 8057 Diag(FD->getLocation(), diag::ext_flexible_array_union_ms) 8058 << FD->getDeclName(); 8059 else if (NumFields == 1) 8060 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_ms) 8061 << FD->getDeclName() << Record->getTagKind(); 8062 } else if (getLangOptions().CPlusPlus) { 8063 if (Record->isUnion()) 8064 Diag(FD->getLocation(), diag::ext_flexible_array_union_gnu) 8065 << FD->getDeclName(); 8066 else if (NumFields == 1) 8067 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_gnu) 8068 << FD->getDeclName() << Record->getTagKind(); 8069 } else if (NumNamedMembers < 1) { 8070 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 8071 << FD->getDeclName(); 8072 FD->setInvalidDecl(); 8073 EnclosingDecl->setInvalidDecl(); 8074 continue; 8075 } 8076 if (!FD->getType()->isDependentType() && 8077 !Context.getBaseElementType(FD->getType())->isPODType()) { 8078 Diag(FD->getLocation(), diag::err_flexible_array_has_nonpod_type) 8079 << FD->getDeclName() << FD->getType(); 8080 FD->setInvalidDecl(); 8081 EnclosingDecl->setInvalidDecl(); 8082 continue; 8083 } 8084 // Okay, we have a legal flexible array member at the end of the struct. 8085 if (Record) 8086 Record->setHasFlexibleArrayMember(true); 8087 } else if (!FDTy->isDependentType() && 8088 RequireCompleteType(FD->getLocation(), FD->getType(), 8089 diag::err_field_incomplete)) { 8090 // Incomplete type 8091 FD->setInvalidDecl(); 8092 EnclosingDecl->setInvalidDecl(); 8093 continue; 8094 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) { 8095 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 8096 // If this is a member of a union, then entire union becomes "flexible". 8097 if (Record && Record->isUnion()) { 8098 Record->setHasFlexibleArrayMember(true); 8099 } else { 8100 // If this is a struct/class and this is not the last element, reject 8101 // it. Note that GCC supports variable sized arrays in the middle of 8102 // structures. 8103 if (i != NumFields-1) 8104 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 8105 << FD->getDeclName() << FD->getType(); 8106 else { 8107 // We support flexible arrays at the end of structs in 8108 // other structs as an extension. 8109 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 8110 << FD->getDeclName(); 8111 if (Record) 8112 Record->setHasFlexibleArrayMember(true); 8113 } 8114 } 8115 } 8116 if (Record && FDTTy->getDecl()->hasObjectMember()) 8117 Record->setHasObjectMember(true); 8118 } else if (FDTy->isObjCObjectType()) { 8119 /// A field cannot be an Objective-c object 8120 Diag(FD->getLocation(), diag::err_statically_allocated_object); 8121 FD->setInvalidDecl(); 8122 EnclosingDecl->setInvalidDecl(); 8123 continue; 8124 } else if (getLangOptions().ObjC1 && 8125 getLangOptions().getGCMode() != LangOptions::NonGC && 8126 Record && 8127 (FD->getType()->isObjCObjectPointerType() || 8128 FD->getType().isObjCGCStrong())) 8129 Record->setHasObjectMember(true); 8130 else if (Context.getAsArrayType(FD->getType())) { 8131 QualType BaseType = Context.getBaseElementType(FD->getType()); 8132 if (Record && BaseType->isRecordType() && 8133 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()) 8134 Record->setHasObjectMember(true); 8135 } 8136 // Keep track of the number of named members. 8137 if (FD->getIdentifier()) 8138 ++NumNamedMembers; 8139 } 8140 8141 // Okay, we successfully defined 'Record'. 8142 if (Record) { 8143 bool Completed = false; 8144 if (CXXRecordDecl *CXXRecord = dyn_cast<CXXRecordDecl>(Record)) { 8145 if (!CXXRecord->isInvalidDecl()) { 8146 // Set access bits correctly on the directly-declared conversions. 8147 UnresolvedSetImpl *Convs = CXXRecord->getConversionFunctions(); 8148 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); 8149 I != E; ++I) 8150 Convs->setAccess(I, (*I)->getAccess()); 8151 8152 if (!CXXRecord->isDependentType()) { 8153 // Adjust user-defined destructor exception spec. 8154 if (getLangOptions().CPlusPlus0x && 8155 CXXRecord->hasUserDeclaredDestructor()) 8156 AdjustDestructorExceptionSpec(CXXRecord,CXXRecord->getDestructor()); 8157 8158 // Add any implicitly-declared members to this class. 8159 AddImplicitlyDeclaredMembersToClass(CXXRecord); 8160 8161 // If we have virtual base classes, we may end up finding multiple 8162 // final overriders for a given virtual function. Check for this 8163 // problem now. 8164 if (CXXRecord->getNumVBases()) { 8165 CXXFinalOverriderMap FinalOverriders; 8166 CXXRecord->getFinalOverriders(FinalOverriders); 8167 8168 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 8169 MEnd = FinalOverriders.end(); 8170 M != MEnd; ++M) { 8171 for (OverridingMethods::iterator SO = M->second.begin(), 8172 SOEnd = M->second.end(); 8173 SO != SOEnd; ++SO) { 8174 assert(SO->second.size() > 0 && 8175 "Virtual function without overridding functions?"); 8176 if (SO->second.size() == 1) 8177 continue; 8178 8179 // C++ [class.virtual]p2: 8180 // In a derived class, if a virtual member function of a base 8181 // class subobject has more than one final overrider the 8182 // program is ill-formed. 8183 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 8184 << (NamedDecl *)M->first << Record; 8185 Diag(M->first->getLocation(), 8186 diag::note_overridden_virtual_function); 8187 for (OverridingMethods::overriding_iterator 8188 OM = SO->second.begin(), 8189 OMEnd = SO->second.end(); 8190 OM != OMEnd; ++OM) 8191 Diag(OM->Method->getLocation(), diag::note_final_overrider) 8192 << (NamedDecl *)M->first << OM->Method->getParent(); 8193 8194 Record->setInvalidDecl(); 8195 } 8196 } 8197 CXXRecord->completeDefinition(&FinalOverriders); 8198 Completed = true; 8199 } 8200 } 8201 } 8202 } 8203 8204 if (!Completed) 8205 Record->completeDefinition(); 8206 8207 // Now that the record is complete, do any delayed exception spec checks 8208 // we were missing. 8209 if (!DelayedDestructorExceptionSpecChecks.empty()) { 8210 const CXXDestructorDecl *Dtor = 8211 DelayedDestructorExceptionSpecChecks.back().first; 8212 if (Dtor->getParent() == Record) { 8213 assert(!Dtor->getParent()->isDependentType() && 8214 "Should not ever add destructors of templates into the list."); 8215 CheckOverridingFunctionExceptionSpec(Dtor, 8216 DelayedDestructorExceptionSpecChecks.back().second); 8217 DelayedDestructorExceptionSpecChecks.pop_back(); 8218 } 8219 } 8220 8221 } else { 8222 ObjCIvarDecl **ClsFields = 8223 reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); 8224 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 8225 ID->setLocEnd(RBrac); 8226 // Add ivar's to class's DeclContext. 8227 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 8228 ClsFields[i]->setLexicalDeclContext(ID); 8229 ID->addDecl(ClsFields[i]); 8230 } 8231 // Must enforce the rule that ivars in the base classes may not be 8232 // duplicates. 8233 if (ID->getSuperClass()) 8234 DiagnoseDuplicateIvars(ID, ID->getSuperClass()); 8235 } else if (ObjCImplementationDecl *IMPDecl = 8236 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 8237 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 8238 for (unsigned I = 0, N = RecFields.size(); I != N; ++I) 8239 // Ivar declared in @implementation never belongs to the implementation. 8240 // Only it is in implementation's lexical context. 8241 ClsFields[I]->setLexicalDeclContext(IMPDecl); 8242 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 8243 } else if (ObjCCategoryDecl *CDecl = 8244 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 8245 // case of ivars in class extension; all other cases have been 8246 // reported as errors elsewhere. 8247 // FIXME. Class extension does not have a LocEnd field. 8248 // CDecl->setLocEnd(RBrac); 8249 // Add ivar's to class extension's DeclContext. 8250 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 8251 ClsFields[i]->setLexicalDeclContext(CDecl); 8252 CDecl->addDecl(ClsFields[i]); 8253 } 8254 } 8255 } 8256 8257 if (Attr) 8258 ProcessDeclAttributeList(S, Record, Attr); 8259 8260 // If there's a #pragma GCC visibility in scope, and this isn't a subclass, 8261 // set the visibility of this record. 8262 if (Record && !Record->getDeclContext()->isRecord()) 8263 AddPushedVisibilityAttribute(Record); 8264} 8265 8266/// \brief Determine whether the given integral value is representable within 8267/// the given type T. 8268static bool isRepresentableIntegerValue(ASTContext &Context, 8269 llvm::APSInt &Value, 8270 QualType T) { 8271 assert(T->isIntegralType(Context) && "Integral type required!"); 8272 unsigned BitWidth = Context.getIntWidth(T); 8273 8274 if (Value.isUnsigned() || Value.isNonNegative()) { 8275 if (T->isSignedIntegerOrEnumerationType()) 8276 --BitWidth; 8277 return Value.getActiveBits() <= BitWidth; 8278 } 8279 return Value.getMinSignedBits() <= BitWidth; 8280} 8281 8282// \brief Given an integral type, return the next larger integral type 8283// (or a NULL type of no such type exists). 8284static QualType getNextLargerIntegralType(ASTContext &Context, QualType T) { 8285 // FIXME: Int128/UInt128 support, which also needs to be introduced into 8286 // enum checking below. 8287 assert(T->isIntegralType(Context) && "Integral type required!"); 8288 const unsigned NumTypes = 4; 8289 QualType SignedIntegralTypes[NumTypes] = { 8290 Context.ShortTy, Context.IntTy, Context.LongTy, Context.LongLongTy 8291 }; 8292 QualType UnsignedIntegralTypes[NumTypes] = { 8293 Context.UnsignedShortTy, Context.UnsignedIntTy, Context.UnsignedLongTy, 8294 Context.UnsignedLongLongTy 8295 }; 8296 8297 unsigned BitWidth = Context.getTypeSize(T); 8298 QualType *Types = T->isSignedIntegerOrEnumerationType()? SignedIntegralTypes 8299 : UnsignedIntegralTypes; 8300 for (unsigned I = 0; I != NumTypes; ++I) 8301 if (Context.getTypeSize(Types[I]) > BitWidth) 8302 return Types[I]; 8303 8304 return QualType(); 8305} 8306 8307EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 8308 EnumConstantDecl *LastEnumConst, 8309 SourceLocation IdLoc, 8310 IdentifierInfo *Id, 8311 Expr *Val) { 8312 unsigned IntWidth = Context.Target.getIntWidth(); 8313 llvm::APSInt EnumVal(IntWidth); 8314 QualType EltTy; 8315 8316 if (Val && DiagnoseUnexpandedParameterPack(Val, UPPC_EnumeratorValue)) 8317 Val = 0; 8318 8319 if (Val) { 8320 if (Enum->isDependentType() || Val->isTypeDependent()) 8321 EltTy = Context.DependentTy; 8322 else { 8323 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 8324 SourceLocation ExpLoc; 8325 if (!Val->isValueDependent() && 8326 VerifyIntegerConstantExpression(Val, &EnumVal)) { 8327 Val = 0; 8328 } else { 8329 if (!getLangOptions().CPlusPlus) { 8330 // C99 6.7.2.2p2: 8331 // The expression that defines the value of an enumeration constant 8332 // shall be an integer constant expression that has a value 8333 // representable as an int. 8334 8335 // Complain if the value is not representable in an int. 8336 if (!isRepresentableIntegerValue(Context, EnumVal, Context.IntTy)) 8337 Diag(IdLoc, diag::ext_enum_value_not_int) 8338 << EnumVal.toString(10) << Val->getSourceRange() 8339 << (EnumVal.isUnsigned() || EnumVal.isNonNegative()); 8340 else if (!Context.hasSameType(Val->getType(), Context.IntTy)) { 8341 // Force the type of the expression to 'int'. 8342 Val = ImpCastExprToType(Val, Context.IntTy, CK_IntegralCast).take(); 8343 } 8344 } 8345 8346 if (Enum->isFixed()) { 8347 EltTy = Enum->getIntegerType(); 8348 8349 // C++0x [dcl.enum]p5: 8350 // ... if the initializing value of an enumerator cannot be 8351 // represented by the underlying type, the program is ill-formed. 8352 if (!isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 8353 if (getLangOptions().Microsoft) { 8354 Diag(IdLoc, diag::ext_enumerator_too_large) << EltTy; 8355 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 8356 } else 8357 Diag(IdLoc, diag::err_enumerator_too_large) 8358 << EltTy; 8359 } else 8360 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 8361 } 8362 else { 8363 // C++0x [dcl.enum]p5: 8364 // If the underlying type is not fixed, the type of each enumerator 8365 // is the type of its initializing value: 8366 // - If an initializer is specified for an enumerator, the 8367 // initializing value has the same type as the expression. 8368 EltTy = Val->getType(); 8369 } 8370 } 8371 } 8372 } 8373 8374 if (!Val) { 8375 if (Enum->isDependentType()) 8376 EltTy = Context.DependentTy; 8377 else if (!LastEnumConst) { 8378 // C++0x [dcl.enum]p5: 8379 // If the underlying type is not fixed, the type of each enumerator 8380 // is the type of its initializing value: 8381 // - If no initializer is specified for the first enumerator, the 8382 // initializing value has an unspecified integral type. 8383 // 8384 // GCC uses 'int' for its unspecified integral type, as does 8385 // C99 6.7.2.2p3. 8386 if (Enum->isFixed()) { 8387 EltTy = Enum->getIntegerType(); 8388 } 8389 else { 8390 EltTy = Context.IntTy; 8391 } 8392 } else { 8393 // Assign the last value + 1. 8394 EnumVal = LastEnumConst->getInitVal(); 8395 ++EnumVal; 8396 EltTy = LastEnumConst->getType(); 8397 8398 // Check for overflow on increment. 8399 if (EnumVal < LastEnumConst->getInitVal()) { 8400 // C++0x [dcl.enum]p5: 8401 // If the underlying type is not fixed, the type of each enumerator 8402 // is the type of its initializing value: 8403 // 8404 // - Otherwise the type of the initializing value is the same as 8405 // the type of the initializing value of the preceding enumerator 8406 // unless the incremented value is not representable in that type, 8407 // in which case the type is an unspecified integral type 8408 // sufficient to contain the incremented value. If no such type 8409 // exists, the program is ill-formed. 8410 QualType T = getNextLargerIntegralType(Context, EltTy); 8411 if (T.isNull() || Enum->isFixed()) { 8412 // There is no integral type larger enough to represent this 8413 // value. Complain, then allow the value to wrap around. 8414 EnumVal = LastEnumConst->getInitVal(); 8415 EnumVal = EnumVal.zext(EnumVal.getBitWidth() * 2); 8416 ++EnumVal; 8417 if (Enum->isFixed()) 8418 // When the underlying type is fixed, this is ill-formed. 8419 Diag(IdLoc, diag::err_enumerator_wrapped) 8420 << EnumVal.toString(10) 8421 << EltTy; 8422 else 8423 Diag(IdLoc, diag::warn_enumerator_too_large) 8424 << EnumVal.toString(10); 8425 } else { 8426 EltTy = T; 8427 } 8428 8429 // Retrieve the last enumerator's value, extent that type to the 8430 // type that is supposed to be large enough to represent the incremented 8431 // value, then increment. 8432 EnumVal = LastEnumConst->getInitVal(); 8433 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 8434 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 8435 ++EnumVal; 8436 8437 // If we're not in C++, diagnose the overflow of enumerator values, 8438 // which in C99 means that the enumerator value is not representable in 8439 // an int (C99 6.7.2.2p2). However, we support GCC's extension that 8440 // permits enumerator values that are representable in some larger 8441 // integral type. 8442 if (!getLangOptions().CPlusPlus && !T.isNull()) 8443 Diag(IdLoc, diag::warn_enum_value_overflow); 8444 } else if (!getLangOptions().CPlusPlus && 8445 !isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 8446 // Enforce C99 6.7.2.2p2 even when we compute the next value. 8447 Diag(IdLoc, diag::ext_enum_value_not_int) 8448 << EnumVal.toString(10) << 1; 8449 } 8450 } 8451 } 8452 8453 if (!EltTy->isDependentType()) { 8454 // Make the enumerator value match the signedness and size of the 8455 // enumerator's type. 8456 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 8457 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 8458 } 8459 8460 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 8461 Val, EnumVal); 8462} 8463 8464 8465Decl *Sema::ActOnEnumConstant(Scope *S, Decl *theEnumDecl, Decl *lastEnumConst, 8466 SourceLocation IdLoc, IdentifierInfo *Id, 8467 AttributeList *Attr, 8468 SourceLocation EqualLoc, ExprTy *val) { 8469 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl); 8470 EnumConstantDecl *LastEnumConst = 8471 cast_or_null<EnumConstantDecl>(lastEnumConst); 8472 Expr *Val = static_cast<Expr*>(val); 8473 8474 // The scope passed in may not be a decl scope. Zip up the scope tree until 8475 // we find one that is. 8476 S = getNonFieldDeclScope(S); 8477 8478 // Verify that there isn't already something declared with this name in this 8479 // scope. 8480 NamedDecl *PrevDecl = LookupSingleName(S, Id, IdLoc, LookupOrdinaryName, 8481 ForRedeclaration); 8482 if (PrevDecl && PrevDecl->isTemplateParameter()) { 8483 // Maybe we will complain about the shadowed template parameter. 8484 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 8485 // Just pretend that we didn't see the previous declaration. 8486 PrevDecl = 0; 8487 } 8488 8489 if (PrevDecl) { 8490 // When in C++, we may get a TagDecl with the same name; in this case the 8491 // enum constant will 'hide' the tag. 8492 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 8493 "Received TagDecl when not in C++!"); 8494 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 8495 if (isa<EnumConstantDecl>(PrevDecl)) 8496 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 8497 else 8498 Diag(IdLoc, diag::err_redefinition) << Id; 8499 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 8500 return 0; 8501 } 8502 } 8503 8504 // C++ [class.mem]p13: 8505 // If T is the name of a class, then each of the following shall have a 8506 // name different from T: 8507 // - every enumerator of every member of class T that is an enumerated 8508 // type 8509 if (CXXRecordDecl *Record 8510 = dyn_cast<CXXRecordDecl>( 8511 TheEnumDecl->getDeclContext()->getRedeclContext())) 8512 if (Record->getIdentifier() && Record->getIdentifier() == Id) 8513 Diag(IdLoc, diag::err_member_name_of_class) << Id; 8514 8515 EnumConstantDecl *New = 8516 CheckEnumConstant(TheEnumDecl, LastEnumConst, IdLoc, Id, Val); 8517 8518 if (New) { 8519 // Process attributes. 8520 if (Attr) ProcessDeclAttributeList(S, New, Attr); 8521 8522 // Register this decl in the current scope stack. 8523 New->setAccess(TheEnumDecl->getAccess()); 8524 PushOnScopeChains(New, S); 8525 } 8526 8527 return New; 8528} 8529 8530void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc, 8531 SourceLocation RBraceLoc, Decl *EnumDeclX, 8532 Decl **Elements, unsigned NumElements, 8533 Scope *S, AttributeList *Attr) { 8534 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX); 8535 QualType EnumType = Context.getTypeDeclType(Enum); 8536 8537 if (Attr) 8538 ProcessDeclAttributeList(S, Enum, Attr); 8539 8540 if (Enum->isDependentType()) { 8541 for (unsigned i = 0; i != NumElements; ++i) { 8542 EnumConstantDecl *ECD = 8543 cast_or_null<EnumConstantDecl>(Elements[i]); 8544 if (!ECD) continue; 8545 8546 ECD->setType(EnumType); 8547 } 8548 8549 Enum->completeDefinition(Context.DependentTy, Context.DependentTy, 0, 0); 8550 return; 8551 } 8552 8553 // TODO: If the result value doesn't fit in an int, it must be a long or long 8554 // long value. ISO C does not support this, but GCC does as an extension, 8555 // emit a warning. 8556 unsigned IntWidth = Context.Target.getIntWidth(); 8557 unsigned CharWidth = Context.Target.getCharWidth(); 8558 unsigned ShortWidth = Context.Target.getShortWidth(); 8559 8560 // Verify that all the values are okay, compute the size of the values, and 8561 // reverse the list. 8562 unsigned NumNegativeBits = 0; 8563 unsigned NumPositiveBits = 0; 8564 8565 // Keep track of whether all elements have type int. 8566 bool AllElementsInt = true; 8567 8568 for (unsigned i = 0; i != NumElements; ++i) { 8569 EnumConstantDecl *ECD = 8570 cast_or_null<EnumConstantDecl>(Elements[i]); 8571 if (!ECD) continue; // Already issued a diagnostic. 8572 8573 const llvm::APSInt &InitVal = ECD->getInitVal(); 8574 8575 // Keep track of the size of positive and negative values. 8576 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 8577 NumPositiveBits = std::max(NumPositiveBits, 8578 (unsigned)InitVal.getActiveBits()); 8579 else 8580 NumNegativeBits = std::max(NumNegativeBits, 8581 (unsigned)InitVal.getMinSignedBits()); 8582 8583 // Keep track of whether every enum element has type int (very commmon). 8584 if (AllElementsInt) 8585 AllElementsInt = ECD->getType() == Context.IntTy; 8586 } 8587 8588 // Figure out the type that should be used for this enum. 8589 QualType BestType; 8590 unsigned BestWidth; 8591 8592 // C++0x N3000 [conv.prom]p3: 8593 // An rvalue of an unscoped enumeration type whose underlying 8594 // type is not fixed can be converted to an rvalue of the first 8595 // of the following types that can represent all the values of 8596 // the enumeration: int, unsigned int, long int, unsigned long 8597 // int, long long int, or unsigned long long int. 8598 // C99 6.4.4.3p2: 8599 // An identifier declared as an enumeration constant has type int. 8600 // The C99 rule is modified by a gcc extension 8601 QualType BestPromotionType; 8602 8603 bool Packed = Enum->getAttr<PackedAttr>() ? true : false; 8604 // -fshort-enums is the equivalent to specifying the packed attribute on all 8605 // enum definitions. 8606 if (LangOpts.ShortEnums) 8607 Packed = true; 8608 8609 if (Enum->isFixed()) { 8610 BestType = BestPromotionType = Enum->getIntegerType(); 8611 // We don't need to set BestWidth, because BestType is going to be the type 8612 // of the enumerators, but we do anyway because otherwise some compilers 8613 // warn that it might be used uninitialized. 8614 BestWidth = CharWidth; 8615 } 8616 else if (NumNegativeBits) { 8617 // If there is a negative value, figure out the smallest integer type (of 8618 // int/long/longlong) that fits. 8619 // If it's packed, check also if it fits a char or a short. 8620 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) { 8621 BestType = Context.SignedCharTy; 8622 BestWidth = CharWidth; 8623 } else if (Packed && NumNegativeBits <= ShortWidth && 8624 NumPositiveBits < ShortWidth) { 8625 BestType = Context.ShortTy; 8626 BestWidth = ShortWidth; 8627 } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 8628 BestType = Context.IntTy; 8629 BestWidth = IntWidth; 8630 } else { 8631 BestWidth = Context.Target.getLongWidth(); 8632 8633 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) { 8634 BestType = Context.LongTy; 8635 } else { 8636 BestWidth = Context.Target.getLongLongWidth(); 8637 8638 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 8639 Diag(Enum->getLocation(), diag::warn_enum_too_large); 8640 BestType = Context.LongLongTy; 8641 } 8642 } 8643 BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType); 8644 } else { 8645 // If there is no negative value, figure out the smallest type that fits 8646 // all of the enumerator values. 8647 // If it's packed, check also if it fits a char or a short. 8648 if (Packed && NumPositiveBits <= CharWidth) { 8649 BestType = Context.UnsignedCharTy; 8650 BestPromotionType = Context.IntTy; 8651 BestWidth = CharWidth; 8652 } else if (Packed && NumPositiveBits <= ShortWidth) { 8653 BestType = Context.UnsignedShortTy; 8654 BestPromotionType = Context.IntTy; 8655 BestWidth = ShortWidth; 8656 } else if (NumPositiveBits <= IntWidth) { 8657 BestType = Context.UnsignedIntTy; 8658 BestWidth = IntWidth; 8659 BestPromotionType 8660 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 8661 ? Context.UnsignedIntTy : Context.IntTy; 8662 } else if (NumPositiveBits <= 8663 (BestWidth = Context.Target.getLongWidth())) { 8664 BestType = Context.UnsignedLongTy; 8665 BestPromotionType 8666 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 8667 ? Context.UnsignedLongTy : Context.LongTy; 8668 } else { 8669 BestWidth = Context.Target.getLongLongWidth(); 8670 assert(NumPositiveBits <= BestWidth && 8671 "How could an initializer get larger than ULL?"); 8672 BestType = Context.UnsignedLongLongTy; 8673 BestPromotionType 8674 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 8675 ? Context.UnsignedLongLongTy : Context.LongLongTy; 8676 } 8677 } 8678 8679 // Loop over all of the enumerator constants, changing their types to match 8680 // the type of the enum if needed. 8681 for (unsigned i = 0; i != NumElements; ++i) { 8682 EnumConstantDecl *ECD = cast_or_null<EnumConstantDecl>(Elements[i]); 8683 if (!ECD) continue; // Already issued a diagnostic. 8684 8685 // Standard C says the enumerators have int type, but we allow, as an 8686 // extension, the enumerators to be larger than int size. If each 8687 // enumerator value fits in an int, type it as an int, otherwise type it the 8688 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 8689 // that X has type 'int', not 'unsigned'. 8690 8691 // Determine whether the value fits into an int. 8692 llvm::APSInt InitVal = ECD->getInitVal(); 8693 8694 // If it fits into an integer type, force it. Otherwise force it to match 8695 // the enum decl type. 8696 QualType NewTy; 8697 unsigned NewWidth; 8698 bool NewSign; 8699 if (!getLangOptions().CPlusPlus && 8700 isRepresentableIntegerValue(Context, InitVal, Context.IntTy)) { 8701 NewTy = Context.IntTy; 8702 NewWidth = IntWidth; 8703 NewSign = true; 8704 } else if (ECD->getType() == BestType) { 8705 // Already the right type! 8706 if (getLangOptions().CPlusPlus) 8707 // C++ [dcl.enum]p4: Following the closing brace of an 8708 // enum-specifier, each enumerator has the type of its 8709 // enumeration. 8710 ECD->setType(EnumType); 8711 continue; 8712 } else { 8713 NewTy = BestType; 8714 NewWidth = BestWidth; 8715 NewSign = BestType->isSignedIntegerOrEnumerationType(); 8716 } 8717 8718 // Adjust the APSInt value. 8719 InitVal = InitVal.extOrTrunc(NewWidth); 8720 InitVal.setIsSigned(NewSign); 8721 ECD->setInitVal(InitVal); 8722 8723 // Adjust the Expr initializer and type. 8724 if (ECD->getInitExpr() && 8725 !Context.hasSameType(NewTy, ECD->getInitExpr()->getType())) 8726 ECD->setInitExpr(ImplicitCastExpr::Create(Context, NewTy, 8727 CK_IntegralCast, 8728 ECD->getInitExpr(), 8729 /*base paths*/ 0, 8730 VK_RValue)); 8731 if (getLangOptions().CPlusPlus) 8732 // C++ [dcl.enum]p4: Following the closing brace of an 8733 // enum-specifier, each enumerator has the type of its 8734 // enumeration. 8735 ECD->setType(EnumType); 8736 else 8737 ECD->setType(NewTy); 8738 } 8739 8740 Enum->completeDefinition(BestType, BestPromotionType, 8741 NumPositiveBits, NumNegativeBits); 8742} 8743 8744Decl *Sema::ActOnFileScopeAsmDecl(Expr *expr, 8745 SourceLocation StartLoc, 8746 SourceLocation EndLoc) { 8747 StringLiteral *AsmString = cast<StringLiteral>(expr); 8748 8749 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext, 8750 AsmString, StartLoc, 8751 EndLoc); 8752 CurContext->addDecl(New); 8753 return New; 8754} 8755 8756void Sema::ActOnPragmaWeakID(IdentifierInfo* Name, 8757 SourceLocation PragmaLoc, 8758 SourceLocation NameLoc) { 8759 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, LookupOrdinaryName); 8760 8761 if (PrevDecl) { 8762 PrevDecl->addAttr(::new (Context) WeakAttr(PragmaLoc, Context)); 8763 } else { 8764 (void)WeakUndeclaredIdentifiers.insert( 8765 std::pair<IdentifierInfo*,WeakInfo> 8766 (Name, WeakInfo((IdentifierInfo*)0, NameLoc))); 8767 } 8768} 8769 8770void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name, 8771 IdentifierInfo* AliasName, 8772 SourceLocation PragmaLoc, 8773 SourceLocation NameLoc, 8774 SourceLocation AliasNameLoc) { 8775 Decl *PrevDecl = LookupSingleName(TUScope, AliasName, AliasNameLoc, 8776 LookupOrdinaryName); 8777 WeakInfo W = WeakInfo(Name, NameLoc); 8778 8779 if (PrevDecl) { 8780 if (!PrevDecl->hasAttr<AliasAttr>()) 8781 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl)) 8782 DeclApplyPragmaWeak(TUScope, ND, W); 8783 } else { 8784 (void)WeakUndeclaredIdentifiers.insert( 8785 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W)); 8786 } 8787} 8788