SemaDecl.cpp revision 516116308007280f0dd6661cdd94112468c3c5fc
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, Decl *OwnedType) { 49 if (OwnedType) { 50 Decl *Group[2] = { OwnedType, Ptr }; 51 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, 2)); 52 } 53 54 return DeclGroupPtrTy::make(DeclGroupRef(Ptr)); 55} 56 57/// \brief If the identifier refers to a type name within this scope, 58/// return the declaration of that type. 59/// 60/// This routine performs ordinary name lookup of the identifier II 61/// within the given scope, with optional C++ scope specifier SS, to 62/// determine whether the name refers to a type. If so, returns an 63/// opaque pointer (actually a QualType) corresponding to that 64/// type. Otherwise, returns NULL. 65/// 66/// If name lookup results in an ambiguity, this routine will complain 67/// and then return NULL. 68ParsedType Sema::getTypeName(IdentifierInfo &II, SourceLocation NameLoc, 69 Scope *S, CXXScopeSpec *SS, 70 bool isClassName, bool HasTrailingDot, 71 ParsedType ObjectTypePtr, 72 bool WantNontrivialTypeSourceInfo) { 73 // Determine where we will perform name lookup. 74 DeclContext *LookupCtx = 0; 75 if (ObjectTypePtr) { 76 QualType ObjectType = ObjectTypePtr.get(); 77 if (ObjectType->isRecordType()) 78 LookupCtx = computeDeclContext(ObjectType); 79 } else if (SS && SS->isNotEmpty()) { 80 LookupCtx = computeDeclContext(*SS, false); 81 82 if (!LookupCtx) { 83 if (isDependentScopeSpecifier(*SS)) { 84 // C++ [temp.res]p3: 85 // A qualified-id that refers to a type and in which the 86 // nested-name-specifier depends on a template-parameter (14.6.2) 87 // shall be prefixed by the keyword typename to indicate that the 88 // qualified-id denotes a type, forming an 89 // elaborated-type-specifier (7.1.5.3). 90 // 91 // We therefore do not perform any name lookup if the result would 92 // refer to a member of an unknown specialization. 93 if (!isClassName) 94 return ParsedType(); 95 96 // We know from the grammar that this name refers to a type, 97 // so build a dependent node to describe the type. 98 if (WantNontrivialTypeSourceInfo) 99 return ActOnTypenameType(S, SourceLocation(), *SS, II, NameLoc).get(); 100 101 NestedNameSpecifierLoc QualifierLoc = SS->getWithLocInContext(Context); 102 QualType T = 103 CheckTypenameType(ETK_None, SourceLocation(), QualifierLoc, 104 II, NameLoc); 105 106 return ParsedType::make(T); 107 } 108 109 return ParsedType(); 110 } 111 112 if (!LookupCtx->isDependentContext() && 113 RequireCompleteDeclContext(*SS, LookupCtx)) 114 return ParsedType(); 115 } 116 117 // FIXME: LookupNestedNameSpecifierName isn't the right kind of 118 // lookup for class-names. 119 LookupNameKind Kind = isClassName ? LookupNestedNameSpecifierName : 120 LookupOrdinaryName; 121 LookupResult Result(*this, &II, NameLoc, Kind); 122 if (LookupCtx) { 123 // Perform "qualified" name lookup into the declaration context we 124 // computed, which is either the type of the base of a member access 125 // expression or the declaration context associated with a prior 126 // nested-name-specifier. 127 LookupQualifiedName(Result, LookupCtx); 128 129 if (ObjectTypePtr && Result.empty()) { 130 // C++ [basic.lookup.classref]p3: 131 // If the unqualified-id is ~type-name, the type-name is looked up 132 // in the context of the entire postfix-expression. If the type T of 133 // the object expression is of a class type C, the type-name is also 134 // looked up in the scope of class C. At least one of the lookups shall 135 // find a name that refers to (possibly cv-qualified) T. 136 LookupName(Result, S); 137 } 138 } else { 139 // Perform unqualified name lookup. 140 LookupName(Result, S); 141 } 142 143 NamedDecl *IIDecl = 0; 144 switch (Result.getResultKind()) { 145 case LookupResult::NotFound: 146 case LookupResult::NotFoundInCurrentInstantiation: 147 case LookupResult::FoundOverloaded: 148 case LookupResult::FoundUnresolvedValue: 149 Result.suppressDiagnostics(); 150 return ParsedType(); 151 152 case LookupResult::Ambiguous: 153 // Recover from type-hiding ambiguities by hiding the type. We'll 154 // do the lookup again when looking for an object, and we can 155 // diagnose the error then. If we don't do this, then the error 156 // about hiding the type will be immediately followed by an error 157 // that only makes sense if the identifier was treated like a type. 158 if (Result.getAmbiguityKind() == LookupResult::AmbiguousTagHiding) { 159 Result.suppressDiagnostics(); 160 return ParsedType(); 161 } 162 163 // Look to see if we have a type anywhere in the list of results. 164 for (LookupResult::iterator Res = Result.begin(), ResEnd = Result.end(); 165 Res != ResEnd; ++Res) { 166 if (isa<TypeDecl>(*Res) || isa<ObjCInterfaceDecl>(*Res)) { 167 if (!IIDecl || 168 (*Res)->getLocation().getRawEncoding() < 169 IIDecl->getLocation().getRawEncoding()) 170 IIDecl = *Res; 171 } 172 } 173 174 if (!IIDecl) { 175 // None of the entities we found is a type, so there is no way 176 // to even assume that the result is a type. In this case, don't 177 // complain about the ambiguity. The parser will either try to 178 // perform this lookup again (e.g., as an object name), which 179 // will produce the ambiguity, or will complain that it expected 180 // a type name. 181 Result.suppressDiagnostics(); 182 return ParsedType(); 183 } 184 185 // We found a type within the ambiguous lookup; diagnose the 186 // ambiguity and then return that type. This might be the right 187 // answer, or it might not be, but it suppresses any attempt to 188 // perform the name lookup again. 189 break; 190 191 case LookupResult::Found: 192 IIDecl = Result.getFoundDecl(); 193 break; 194 } 195 196 assert(IIDecl && "Didn't find decl"); 197 198 QualType T; 199 if (TypeDecl *TD = dyn_cast<TypeDecl>(IIDecl)) { 200 DiagnoseUseOfDecl(IIDecl, NameLoc); 201 202 if (T.isNull()) 203 T = Context.getTypeDeclType(TD); 204 205 if (SS && SS->isNotEmpty()) { 206 if (WantNontrivialTypeSourceInfo) { 207 // Construct a type with type-source information. 208 TypeLocBuilder Builder; 209 Builder.pushTypeSpec(T).setNameLoc(NameLoc); 210 211 T = getElaboratedType(ETK_None, *SS, T); 212 ElaboratedTypeLoc ElabTL = Builder.push<ElaboratedTypeLoc>(T); 213 ElabTL.setKeywordLoc(SourceLocation()); 214 ElabTL.setQualifierLoc(SS->getWithLocInContext(Context)); 215 return CreateParsedType(T, Builder.getTypeSourceInfo(Context, T)); 216 } else { 217 T = getElaboratedType(ETK_None, *SS, T); 218 } 219 } 220 } else if (ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(IIDecl)) { 221 (void)DiagnoseUseOfDecl(IDecl, NameLoc); 222 if (!HasTrailingDot) 223 T = Context.getObjCInterfaceType(IDecl); 224 } 225 226 if (T.isNull()) { 227 // If it's not plausibly a type, suppress diagnostics. 228 Result.suppressDiagnostics(); 229 return ParsedType(); 230 } 231 return ParsedType::make(T); 232} 233 234/// isTagName() - This method is called *for error recovery purposes only* 235/// to determine if the specified name is a valid tag name ("struct foo"). If 236/// so, this returns the TST for the tag corresponding to it (TST_enum, 237/// TST_union, TST_struct, TST_class). This is used to diagnose cases in C 238/// where the user forgot to specify the tag. 239DeclSpec::TST Sema::isTagName(IdentifierInfo &II, Scope *S) { 240 // Do a tag name lookup in this scope. 241 LookupResult R(*this, &II, SourceLocation(), LookupTagName); 242 LookupName(R, S, false); 243 R.suppressDiagnostics(); 244 if (R.getResultKind() == LookupResult::Found) 245 if (const TagDecl *TD = R.getAsSingle<TagDecl>()) { 246 switch (TD->getTagKind()) { 247 default: return DeclSpec::TST_unspecified; 248 case TTK_Struct: return DeclSpec::TST_struct; 249 case TTK_Union: return DeclSpec::TST_union; 250 case TTK_Class: return DeclSpec::TST_class; 251 case TTK_Enum: return DeclSpec::TST_enum; 252 } 253 } 254 255 return DeclSpec::TST_unspecified; 256} 257 258/// isMicrosoftMissingTypename - In Microsoft mode, within class scope, 259/// if a CXXScopeSpec's type is equal to the type of one of the base classes 260/// then downgrade the missing typename error to a warning. 261/// This is needed for MSVC compatibility; Example: 262/// @code 263/// template<class T> class A { 264/// public: 265/// typedef int TYPE; 266/// }; 267/// template<class T> class B : public A<T> { 268/// public: 269/// A<T>::TYPE a; // no typename required because A<T> is a base class. 270/// }; 271/// @endcode 272bool Sema::isMicrosoftMissingTypename(const CXXScopeSpec *SS) { 273 if (CurContext->isRecord()) { 274 const Type *Ty = SS->getScopeRep()->getAsType(); 275 276 CXXRecordDecl *RD = cast<CXXRecordDecl>(CurContext); 277 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 278 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) 279 if (Context.hasSameUnqualifiedType(QualType(Ty, 1), Base->getType())) 280 return true; 281 } 282 return false; 283} 284 285bool Sema::DiagnoseUnknownTypeName(const IdentifierInfo &II, 286 SourceLocation IILoc, 287 Scope *S, 288 CXXScopeSpec *SS, 289 ParsedType &SuggestedType) { 290 // We don't have anything to suggest (yet). 291 SuggestedType = ParsedType(); 292 293 // There may have been a typo in the name of the type. Look up typo 294 // results, in case we have something that we can suggest. 295 if (TypoCorrection Corrected = CorrectTypo(DeclarationNameInfo(&II, IILoc), 296 LookupOrdinaryName, S, SS, NULL, 297 false, CTC_Type)) { 298 std::string CorrectedStr(Corrected.getAsString(getLangOptions())); 299 std::string CorrectedQuotedStr(Corrected.getQuoted(getLangOptions())); 300 301 if (Corrected.isKeyword()) { 302 // We corrected to a keyword. 303 // FIXME: Actually recover with the keyword we suggest, and emit a fix-it. 304 Diag(IILoc, diag::err_unknown_typename_suggest) 305 << &II << CorrectedQuotedStr; 306 return true; 307 } else { 308 NamedDecl *Result = Corrected.getCorrectionDecl(); 309 if ((isa<TypeDecl>(Result) || isa<ObjCInterfaceDecl>(Result)) && 310 !Result->isInvalidDecl()) { 311 // We found a similarly-named type or interface; suggest that. 312 if (!SS || !SS->isSet()) 313 Diag(IILoc, diag::err_unknown_typename_suggest) 314 << &II << CorrectedQuotedStr 315 << FixItHint::CreateReplacement(SourceRange(IILoc), CorrectedStr); 316 else if (DeclContext *DC = computeDeclContext(*SS, false)) 317 Diag(IILoc, diag::err_unknown_nested_typename_suggest) 318 << &II << DC << CorrectedQuotedStr << SS->getRange() 319 << FixItHint::CreateReplacement(SourceRange(IILoc), CorrectedStr); 320 else 321 llvm_unreachable("could not have corrected a typo here"); 322 323 Diag(Result->getLocation(), diag::note_previous_decl) 324 << CorrectedQuotedStr; 325 326 SuggestedType = getTypeName(*Result->getIdentifier(), IILoc, S, SS, 327 false, false, ParsedType(), 328 /*NonTrivialTypeSourceInfo=*/true); 329 return true; 330 } 331 } 332 } 333 334 if (getLangOptions().CPlusPlus) { 335 // See if II is a class template that the user forgot to pass arguments to. 336 UnqualifiedId Name; 337 Name.setIdentifier(&II, IILoc); 338 CXXScopeSpec EmptySS; 339 TemplateTy TemplateResult; 340 bool MemberOfUnknownSpecialization; 341 if (isTemplateName(S, SS ? *SS : EmptySS, /*hasTemplateKeyword=*/false, 342 Name, ParsedType(), true, TemplateResult, 343 MemberOfUnknownSpecialization) == TNK_Type_template) { 344 TemplateName TplName = TemplateResult.getAsVal<TemplateName>(); 345 Diag(IILoc, diag::err_template_missing_args) << TplName; 346 if (TemplateDecl *TplDecl = TplName.getAsTemplateDecl()) { 347 Diag(TplDecl->getLocation(), diag::note_template_decl_here) 348 << TplDecl->getTemplateParameters()->getSourceRange(); 349 } 350 return true; 351 } 352 } 353 354 // FIXME: Should we move the logic that tries to recover from a missing tag 355 // (struct, union, enum) from Parser::ParseImplicitInt here, instead? 356 357 if (!SS || (!SS->isSet() && !SS->isInvalid())) 358 Diag(IILoc, diag::err_unknown_typename) << &II; 359 else if (DeclContext *DC = computeDeclContext(*SS, false)) 360 Diag(IILoc, diag::err_typename_nested_not_found) 361 << &II << DC << SS->getRange(); 362 else if (isDependentScopeSpecifier(*SS)) { 363 unsigned DiagID = diag::err_typename_missing; 364 if (getLangOptions().Microsoft && isMicrosoftMissingTypename(SS)) 365 DiagID = diag::warn_typename_missing; 366 367 Diag(SS->getRange().getBegin(), DiagID) 368 << (NestedNameSpecifier *)SS->getScopeRep() << II.getName() 369 << SourceRange(SS->getRange().getBegin(), IILoc) 370 << FixItHint::CreateInsertion(SS->getRange().getBegin(), "typename "); 371 SuggestedType = ActOnTypenameType(S, SourceLocation(), *SS, II, IILoc).get(); 372 } else { 373 assert(SS && SS->isInvalid() && 374 "Invalid scope specifier has already been diagnosed"); 375 } 376 377 return true; 378} 379 380/// \brief Determine whether the given result set contains either a type name 381/// or 382static bool isResultTypeOrTemplate(LookupResult &R, const Token &NextToken) { 383 bool CheckTemplate = R.getSema().getLangOptions().CPlusPlus && 384 NextToken.is(tok::less); 385 386 for (LookupResult::iterator I = R.begin(), IEnd = R.end(); I != IEnd; ++I) { 387 if (isa<TypeDecl>(*I) || isa<ObjCInterfaceDecl>(*I)) 388 return true; 389 390 if (CheckTemplate && isa<TemplateDecl>(*I)) 391 return true; 392 } 393 394 return false; 395} 396 397Sema::NameClassification Sema::ClassifyName(Scope *S, 398 CXXScopeSpec &SS, 399 IdentifierInfo *&Name, 400 SourceLocation NameLoc, 401 const Token &NextToken) { 402 DeclarationNameInfo NameInfo(Name, NameLoc); 403 ObjCMethodDecl *CurMethod = getCurMethodDecl(); 404 405 if (NextToken.is(tok::coloncolon)) { 406 BuildCXXNestedNameSpecifier(S, *Name, NameLoc, NextToken.getLocation(), 407 QualType(), false, SS, 0, false); 408 409 } 410 411 LookupResult Result(*this, Name, NameLoc, LookupOrdinaryName); 412 LookupParsedName(Result, S, &SS, !CurMethod); 413 414 // Perform lookup for Objective-C instance variables (including automatically 415 // synthesized instance variables), if we're in an Objective-C method. 416 // FIXME: This lookup really, really needs to be folded in to the normal 417 // unqualified lookup mechanism. 418 if (!SS.isSet() && CurMethod && !isResultTypeOrTemplate(Result, NextToken)) { 419 ExprResult E = LookupInObjCMethod(Result, S, Name, true); 420 if (E.get() || E.isInvalid()) 421 return E; 422 423 // Synthesize ivars lazily. 424 if (getLangOptions().ObjCDefaultSynthProperties && 425 getLangOptions().ObjCNonFragileABI2) { 426 if (SynthesizeProvisionalIvar(Result, Name, NameLoc)) { 427 if (const ObjCPropertyDecl *Property = 428 canSynthesizeProvisionalIvar(Name)) { 429 Diag(NameLoc, diag::warn_synthesized_ivar_access) << Name; 430 Diag(Property->getLocation(), diag::note_property_declare); 431 } 432 433 // FIXME: This is strange. Shouldn't we just take the ivar returned 434 // from SynthesizeProvisionalIvar and continue with that? 435 E = LookupInObjCMethod(Result, S, Name, true); 436 if (E.get() || E.isInvalid()) 437 return E; 438 } 439 } 440 } 441 442 bool SecondTry = false; 443 bool IsFilteredTemplateName = false; 444 445Corrected: 446 switch (Result.getResultKind()) { 447 case LookupResult::NotFound: 448 // If an unqualified-id is followed by a '(', then we have a function 449 // call. 450 if (!SS.isSet() && NextToken.is(tok::l_paren)) { 451 // In C++, this is an ADL-only call. 452 // FIXME: Reference? 453 if (getLangOptions().CPlusPlus) 454 return BuildDeclarationNameExpr(SS, Result, /*ADL=*/true); 455 456 // C90 6.3.2.2: 457 // If the expression that precedes the parenthesized argument list in a 458 // function call consists solely of an identifier, and if no 459 // declaration is visible for this identifier, the identifier is 460 // implicitly declared exactly as if, in the innermost block containing 461 // the function call, the declaration 462 // 463 // extern int identifier (); 464 // 465 // appeared. 466 // 467 // We also allow this in C99 as an extension. 468 if (NamedDecl *D = ImplicitlyDefineFunction(NameLoc, *Name, S)) { 469 Result.addDecl(D); 470 Result.resolveKind(); 471 return BuildDeclarationNameExpr(SS, Result, /*ADL=*/false); 472 } 473 } 474 475 // In C, we first see whether there is a tag type by the same name, in 476 // which case it's likely that the user just forget to write "enum", 477 // "struct", or "union". 478 if (!getLangOptions().CPlusPlus && !SecondTry) { 479 Result.clear(LookupTagName); 480 LookupParsedName(Result, S, &SS); 481 if (TagDecl *Tag = Result.getAsSingle<TagDecl>()) { 482 const char *TagName = 0; 483 const char *FixItTagName = 0; 484 switch (Tag->getTagKind()) { 485 case TTK_Class: 486 TagName = "class"; 487 FixItTagName = "class "; 488 break; 489 490 case TTK_Enum: 491 TagName = "enum"; 492 FixItTagName = "enum "; 493 break; 494 495 case TTK_Struct: 496 TagName = "struct"; 497 FixItTagName = "struct "; 498 break; 499 500 case TTK_Union: 501 TagName = "union"; 502 FixItTagName = "union "; 503 break; 504 } 505 506 Diag(NameLoc, diag::err_use_of_tag_name_without_tag) 507 << Name << TagName << getLangOptions().CPlusPlus 508 << FixItHint::CreateInsertion(NameLoc, FixItTagName); 509 break; 510 } 511 512 Result.clear(LookupOrdinaryName); 513 } 514 515 // Perform typo correction to determine if there is another name that is 516 // close to this name. 517 if (!SecondTry) { 518 SecondTry = true; 519 if (TypoCorrection Corrected = CorrectTypo(Result.getLookupNameInfo(), 520 Result.getLookupKind(), S, &SS)) { 521 unsigned UnqualifiedDiag = diag::err_undeclared_var_use_suggest; 522 unsigned QualifiedDiag = diag::err_no_member_suggest; 523 std::string CorrectedStr(Corrected.getAsString(getLangOptions())); 524 std::string CorrectedQuotedStr(Corrected.getQuoted(getLangOptions())); 525 526 NamedDecl *FirstDecl = Corrected.getCorrectionDecl(); 527 NamedDecl *UnderlyingFirstDecl 528 = FirstDecl? FirstDecl->getUnderlyingDecl() : 0; 529 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) && 530 UnderlyingFirstDecl && isa<TemplateDecl>(UnderlyingFirstDecl)) { 531 UnqualifiedDiag = diag::err_no_template_suggest; 532 QualifiedDiag = diag::err_no_member_template_suggest; 533 } else if (UnderlyingFirstDecl && 534 (isa<TypeDecl>(UnderlyingFirstDecl) || 535 isa<ObjCInterfaceDecl>(UnderlyingFirstDecl) || 536 isa<ObjCCompatibleAliasDecl>(UnderlyingFirstDecl))) { 537 UnqualifiedDiag = diag::err_unknown_typename_suggest; 538 QualifiedDiag = diag::err_unknown_nested_typename_suggest; 539 } 540 541 if (SS.isEmpty()) 542 Diag(NameLoc, UnqualifiedDiag) 543 << Name << CorrectedQuotedStr 544 << FixItHint::CreateReplacement(NameLoc, CorrectedStr); 545 else 546 Diag(NameLoc, QualifiedDiag) 547 << Name << computeDeclContext(SS, false) << CorrectedQuotedStr 548 << SS.getRange() 549 << FixItHint::CreateReplacement(NameLoc, CorrectedStr); 550 551 // Update the name, so that the caller has the new name. 552 Name = Corrected.getCorrectionAsIdentifierInfo(); 553 554 // Also update the LookupResult... 555 // FIXME: This should probably go away at some point 556 Result.clear(); 557 Result.setLookupName(Corrected.getCorrection()); 558 if (FirstDecl) Result.addDecl(FirstDecl); 559 560 // Typo correction corrected to a keyword. 561 if (Corrected.isKeyword()) 562 return Corrected.getCorrectionAsIdentifierInfo(); 563 564 if (FirstDecl) 565 Diag(FirstDecl->getLocation(), diag::note_previous_decl) 566 << CorrectedQuotedStr; 567 568 // If we found an Objective-C instance variable, let 569 // LookupInObjCMethod build the appropriate expression to 570 // reference the ivar. 571 // FIXME: This is a gross hack. 572 if (ObjCIvarDecl *Ivar = Result.getAsSingle<ObjCIvarDecl>()) { 573 Result.clear(); 574 ExprResult E(LookupInObjCMethod(Result, S, Ivar->getIdentifier())); 575 return move(E); 576 } 577 578 goto Corrected; 579 } 580 } 581 582 // We failed to correct; just fall through and let the parser deal with it. 583 Result.suppressDiagnostics(); 584 return NameClassification::Unknown(); 585 586 case LookupResult::NotFoundInCurrentInstantiation: 587 // We performed name lookup into the current instantiation, and there were 588 // dependent bases, so we treat this result the same way as any other 589 // dependent nested-name-specifier. 590 591 // C++ [temp.res]p2: 592 // A name used in a template declaration or definition and that is 593 // dependent on a template-parameter is assumed not to name a type 594 // unless the applicable name lookup finds a type name or the name is 595 // qualified by the keyword typename. 596 // 597 // FIXME: If the next token is '<', we might want to ask the parser to 598 // perform some heroics to see if we actually have a 599 // template-argument-list, which would indicate a missing 'template' 600 // keyword here. 601 return BuildDependentDeclRefExpr(SS, NameInfo, /*TemplateArgs=*/0); 602 603 case LookupResult::Found: 604 case LookupResult::FoundOverloaded: 605 case LookupResult::FoundUnresolvedValue: 606 break; 607 608 case LookupResult::Ambiguous: 609 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) && 610 hasAnyAcceptableTemplateNames(Result)) { 611 // C++ [temp.local]p3: 612 // A lookup that finds an injected-class-name (10.2) can result in an 613 // ambiguity in certain cases (for example, if it is found in more than 614 // one base class). If all of the injected-class-names that are found 615 // refer to specializations of the same class template, and if the name 616 // is followed by a template-argument-list, the reference refers to the 617 // class template itself and not a specialization thereof, and is not 618 // ambiguous. 619 // 620 // This filtering can make an ambiguous result into an unambiguous one, 621 // so try again after filtering out template names. 622 FilterAcceptableTemplateNames(Result); 623 if (!Result.isAmbiguous()) { 624 IsFilteredTemplateName = true; 625 break; 626 } 627 } 628 629 // Diagnose the ambiguity and return an error. 630 return NameClassification::Error(); 631 } 632 633 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) && 634 (IsFilteredTemplateName || hasAnyAcceptableTemplateNames(Result))) { 635 // C++ [temp.names]p3: 636 // After name lookup (3.4) finds that a name is a template-name or that 637 // an operator-function-id or a literal- operator-id refers to a set of 638 // overloaded functions any member of which is a function template if 639 // this is followed by a <, the < is always taken as the delimiter of a 640 // template-argument-list and never as the less-than operator. 641 if (!IsFilteredTemplateName) 642 FilterAcceptableTemplateNames(Result); 643 644 if (!Result.empty()) { 645 bool IsFunctionTemplate; 646 TemplateName Template; 647 if (Result.end() - Result.begin() > 1) { 648 IsFunctionTemplate = true; 649 Template = Context.getOverloadedTemplateName(Result.begin(), 650 Result.end()); 651 } else { 652 TemplateDecl *TD 653 = cast<TemplateDecl>((*Result.begin())->getUnderlyingDecl()); 654 IsFunctionTemplate = isa<FunctionTemplateDecl>(TD); 655 656 if (SS.isSet() && !SS.isInvalid()) 657 Template = Context.getQualifiedTemplateName(SS.getScopeRep(), 658 /*TemplateKeyword=*/false, 659 TD); 660 else 661 Template = TemplateName(TD); 662 } 663 664 if (IsFunctionTemplate) { 665 // Function templates always go through overload resolution, at which 666 // point we'll perform the various checks (e.g., accessibility) we need 667 // to based on which function we selected. 668 Result.suppressDiagnostics(); 669 670 return NameClassification::FunctionTemplate(Template); 671 } 672 673 return NameClassification::TypeTemplate(Template); 674 } 675 } 676 677 NamedDecl *FirstDecl = (*Result.begin())->getUnderlyingDecl(); 678 if (TypeDecl *Type = dyn_cast<TypeDecl>(FirstDecl)) { 679 DiagnoseUseOfDecl(Type, NameLoc); 680 QualType T = Context.getTypeDeclType(Type); 681 return ParsedType::make(T); 682 } 683 684 ObjCInterfaceDecl *Class = dyn_cast<ObjCInterfaceDecl>(FirstDecl); 685 if (!Class) { 686 // FIXME: It's unfortunate that we don't have a Type node for handling this. 687 if (ObjCCompatibleAliasDecl *Alias 688 = dyn_cast<ObjCCompatibleAliasDecl>(FirstDecl)) 689 Class = Alias->getClassInterface(); 690 } 691 692 if (Class) { 693 DiagnoseUseOfDecl(Class, NameLoc); 694 695 if (NextToken.is(tok::period)) { 696 // Interface. <something> is parsed as a property reference expression. 697 // Just return "unknown" as a fall-through for now. 698 Result.suppressDiagnostics(); 699 return NameClassification::Unknown(); 700 } 701 702 QualType T = Context.getObjCInterfaceType(Class); 703 return ParsedType::make(T); 704 } 705 706 if (!Result.empty() && (*Result.begin())->isCXXClassMember()) 707 return BuildPossibleImplicitMemberExpr(SS, Result, 0); 708 709 bool ADL = UseArgumentDependentLookup(SS, Result, NextToken.is(tok::l_paren)); 710 return BuildDeclarationNameExpr(SS, Result, ADL); 711} 712 713// Determines the context to return to after temporarily entering a 714// context. This depends in an unnecessarily complicated way on the 715// exact ordering of callbacks from the parser. 716DeclContext *Sema::getContainingDC(DeclContext *DC) { 717 718 // Functions defined inline within classes aren't parsed until we've 719 // finished parsing the top-level class, so the top-level class is 720 // the context we'll need to return to. 721 if (isa<FunctionDecl>(DC)) { 722 DC = DC->getLexicalParent(); 723 724 // A function not defined within a class will always return to its 725 // lexical context. 726 if (!isa<CXXRecordDecl>(DC)) 727 return DC; 728 729 // A C++ inline method/friend is parsed *after* the topmost class 730 // it was declared in is fully parsed ("complete"); the topmost 731 // class is the context we need to return to. 732 while (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC->getLexicalParent())) 733 DC = RD; 734 735 // Return the declaration context of the topmost class the inline method is 736 // declared in. 737 return DC; 738 } 739 740 // ObjCMethodDecls are parsed (for some reason) outside the context 741 // of the class. 742 if (isa<ObjCMethodDecl>(DC)) 743 return DC->getLexicalParent()->getLexicalParent(); 744 745 return DC->getLexicalParent(); 746} 747 748void Sema::PushDeclContext(Scope *S, DeclContext *DC) { 749 assert(getContainingDC(DC) == CurContext && 750 "The next DeclContext should be lexically contained in the current one."); 751 CurContext = DC; 752 S->setEntity(DC); 753} 754 755void Sema::PopDeclContext() { 756 assert(CurContext && "DeclContext imbalance!"); 757 758 CurContext = getContainingDC(CurContext); 759 assert(CurContext && "Popped translation unit!"); 760} 761 762/// EnterDeclaratorContext - Used when we must lookup names in the context 763/// of a declarator's nested name specifier. 764/// 765void Sema::EnterDeclaratorContext(Scope *S, DeclContext *DC) { 766 // C++0x [basic.lookup.unqual]p13: 767 // A name used in the definition of a static data member of class 768 // X (after the qualified-id of the static member) is looked up as 769 // if the name was used in a member function of X. 770 // C++0x [basic.lookup.unqual]p14: 771 // If a variable member of a namespace is defined outside of the 772 // scope of its namespace then any name used in the definition of 773 // the variable member (after the declarator-id) is looked up as 774 // if the definition of the variable member occurred in its 775 // namespace. 776 // Both of these imply that we should push a scope whose context 777 // is the semantic context of the declaration. We can't use 778 // PushDeclContext here because that context is not necessarily 779 // lexically contained in the current context. Fortunately, 780 // the containing scope should have the appropriate information. 781 782 assert(!S->getEntity() && "scope already has entity"); 783 784#ifndef NDEBUG 785 Scope *Ancestor = S->getParent(); 786 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 787 assert(Ancestor->getEntity() == CurContext && "ancestor context mismatch"); 788#endif 789 790 CurContext = DC; 791 S->setEntity(DC); 792} 793 794void Sema::ExitDeclaratorContext(Scope *S) { 795 assert(S->getEntity() == CurContext && "Context imbalance!"); 796 797 // Switch back to the lexical context. The safety of this is 798 // enforced by an assert in EnterDeclaratorContext. 799 Scope *Ancestor = S->getParent(); 800 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 801 CurContext = (DeclContext*) Ancestor->getEntity(); 802 803 // We don't need to do anything with the scope, which is going to 804 // disappear. 805} 806 807/// \brief Determine whether we allow overloading of the function 808/// PrevDecl with another declaration. 809/// 810/// This routine determines whether overloading is possible, not 811/// whether some new function is actually an overload. It will return 812/// true in C++ (where we can always provide overloads) or, as an 813/// extension, in C when the previous function is already an 814/// overloaded function declaration or has the "overloadable" 815/// attribute. 816static bool AllowOverloadingOfFunction(LookupResult &Previous, 817 ASTContext &Context) { 818 if (Context.getLangOptions().CPlusPlus) 819 return true; 820 821 if (Previous.getResultKind() == LookupResult::FoundOverloaded) 822 return true; 823 824 return (Previous.getResultKind() == LookupResult::Found 825 && Previous.getFoundDecl()->hasAttr<OverloadableAttr>()); 826} 827 828/// Add this decl to the scope shadowed decl chains. 829void Sema::PushOnScopeChains(NamedDecl *D, Scope *S, bool AddToContext) { 830 // Move up the scope chain until we find the nearest enclosing 831 // non-transparent context. The declaration will be introduced into this 832 // scope. 833 while (S->getEntity() && 834 ((DeclContext *)S->getEntity())->isTransparentContext()) 835 S = S->getParent(); 836 837 // Add scoped declarations into their context, so that they can be 838 // found later. Declarations without a context won't be inserted 839 // into any context. 840 if (AddToContext) 841 CurContext->addDecl(D); 842 843 // Out-of-line definitions shouldn't be pushed into scope in C++. 844 // Out-of-line variable and function definitions shouldn't even in C. 845 if ((getLangOptions().CPlusPlus || isa<VarDecl>(D) || isa<FunctionDecl>(D)) && 846 D->isOutOfLine()) 847 return; 848 849 // Template instantiations should also not be pushed into scope. 850 if (isa<FunctionDecl>(D) && 851 cast<FunctionDecl>(D)->isFunctionTemplateSpecialization()) 852 return; 853 854 // If this replaces anything in the current scope, 855 IdentifierResolver::iterator I = IdResolver.begin(D->getDeclName()), 856 IEnd = IdResolver.end(); 857 for (; I != IEnd; ++I) { 858 if (S->isDeclScope(*I) && D->declarationReplaces(*I)) { 859 S->RemoveDecl(*I); 860 IdResolver.RemoveDecl(*I); 861 862 // Should only need to replace one decl. 863 break; 864 } 865 } 866 867 S->AddDecl(D); 868 869 if (isa<LabelDecl>(D) && !cast<LabelDecl>(D)->isGnuLocal()) { 870 // Implicitly-generated labels may end up getting generated in an order that 871 // isn't strictly lexical, which breaks name lookup. Be careful to insert 872 // the label at the appropriate place in the identifier chain. 873 for (I = IdResolver.begin(D->getDeclName()); I != IEnd; ++I) { 874 DeclContext *IDC = (*I)->getLexicalDeclContext()->getRedeclContext(); 875 if (IDC == CurContext) { 876 if (!S->isDeclScope(*I)) 877 continue; 878 } else if (IDC->Encloses(CurContext)) 879 break; 880 } 881 882 IdResolver.InsertDeclAfter(I, D); 883 } else { 884 IdResolver.AddDecl(D); 885 } 886} 887 888bool Sema::isDeclInScope(NamedDecl *&D, DeclContext *Ctx, Scope *S, 889 bool ExplicitInstantiationOrSpecialization) { 890 return IdResolver.isDeclInScope(D, Ctx, Context, S, 891 ExplicitInstantiationOrSpecialization); 892} 893 894Scope *Sema::getScopeForDeclContext(Scope *S, DeclContext *DC) { 895 DeclContext *TargetDC = DC->getPrimaryContext(); 896 do { 897 if (DeclContext *ScopeDC = (DeclContext*) S->getEntity()) 898 if (ScopeDC->getPrimaryContext() == TargetDC) 899 return S; 900 } while ((S = S->getParent())); 901 902 return 0; 903} 904 905static bool isOutOfScopePreviousDeclaration(NamedDecl *, 906 DeclContext*, 907 ASTContext&); 908 909/// Filters out lookup results that don't fall within the given scope 910/// as determined by isDeclInScope. 911void Sema::FilterLookupForScope(LookupResult &R, 912 DeclContext *Ctx, Scope *S, 913 bool ConsiderLinkage, 914 bool ExplicitInstantiationOrSpecialization) { 915 LookupResult::Filter F = R.makeFilter(); 916 while (F.hasNext()) { 917 NamedDecl *D = F.next(); 918 919 if (isDeclInScope(D, Ctx, S, ExplicitInstantiationOrSpecialization)) 920 continue; 921 922 if (ConsiderLinkage && 923 isOutOfScopePreviousDeclaration(D, Ctx, Context)) 924 continue; 925 926 F.erase(); 927 } 928 929 F.done(); 930} 931 932static bool isUsingDecl(NamedDecl *D) { 933 return isa<UsingShadowDecl>(D) || 934 isa<UnresolvedUsingTypenameDecl>(D) || 935 isa<UnresolvedUsingValueDecl>(D); 936} 937 938/// Removes using shadow declarations from the lookup results. 939static void RemoveUsingDecls(LookupResult &R) { 940 LookupResult::Filter F = R.makeFilter(); 941 while (F.hasNext()) 942 if (isUsingDecl(F.next())) 943 F.erase(); 944 945 F.done(); 946} 947 948/// \brief Check for this common pattern: 949/// @code 950/// class S { 951/// S(const S&); // DO NOT IMPLEMENT 952/// void operator=(const S&); // DO NOT IMPLEMENT 953/// }; 954/// @endcode 955static bool IsDisallowedCopyOrAssign(const CXXMethodDecl *D) { 956 // FIXME: Should check for private access too but access is set after we get 957 // the decl here. 958 if (D->doesThisDeclarationHaveABody()) 959 return false; 960 961 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(D)) 962 return CD->isCopyConstructor(); 963 if (const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 964 return Method->isCopyAssignmentOperator(); 965 return false; 966} 967 968bool Sema::ShouldWarnIfUnusedFileScopedDecl(const DeclaratorDecl *D) const { 969 assert(D); 970 971 if (D->isInvalidDecl() || D->isUsed() || D->hasAttr<UnusedAttr>()) 972 return false; 973 974 // Ignore class templates. 975 if (D->getDeclContext()->isDependentContext() || 976 D->getLexicalDeclContext()->isDependentContext()) 977 return false; 978 979 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 980 if (FD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 981 return false; 982 983 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 984 if (MD->isVirtual() || IsDisallowedCopyOrAssign(MD)) 985 return false; 986 } else { 987 // 'static inline' functions are used in headers; don't warn. 988 if (FD->getStorageClass() == SC_Static && 989 FD->isInlineSpecified()) 990 return false; 991 } 992 993 if (FD->doesThisDeclarationHaveABody() && 994 Context.DeclMustBeEmitted(FD)) 995 return false; 996 } else if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 997 if (!VD->isFileVarDecl() || 998 VD->getType().isConstant(Context) || 999 Context.DeclMustBeEmitted(VD)) 1000 return false; 1001 1002 if (VD->isStaticDataMember() && 1003 VD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 1004 return false; 1005 1006 } else { 1007 return false; 1008 } 1009 1010 // Only warn for unused decls internal to the translation unit. 1011 if (D->getLinkage() == ExternalLinkage) 1012 return false; 1013 1014 return true; 1015} 1016 1017void Sema::MarkUnusedFileScopedDecl(const DeclaratorDecl *D) { 1018 if (!D) 1019 return; 1020 1021 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 1022 const FunctionDecl *First = FD->getFirstDeclaration(); 1023 if (FD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 1024 return; // First should already be in the vector. 1025 } 1026 1027 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1028 const VarDecl *First = VD->getFirstDeclaration(); 1029 if (VD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 1030 return; // First should already be in the vector. 1031 } 1032 1033 if (ShouldWarnIfUnusedFileScopedDecl(D)) 1034 UnusedFileScopedDecls.push_back(D); 1035 } 1036 1037static bool ShouldDiagnoseUnusedDecl(const NamedDecl *D) { 1038 if (D->isInvalidDecl()) 1039 return false; 1040 1041 if (D->isUsed() || D->hasAttr<UnusedAttr>()) 1042 return false; 1043 1044 if (isa<LabelDecl>(D)) 1045 return true; 1046 1047 // White-list anything that isn't a local variable. 1048 if (!isa<VarDecl>(D) || isa<ParmVarDecl>(D) || isa<ImplicitParamDecl>(D) || 1049 !D->getDeclContext()->isFunctionOrMethod()) 1050 return false; 1051 1052 // Types of valid local variables should be complete, so this should succeed. 1053 if (const ValueDecl *VD = dyn_cast<ValueDecl>(D)) { 1054 1055 // White-list anything with an __attribute__((unused)) type. 1056 QualType Ty = VD->getType(); 1057 1058 // Only look at the outermost level of typedef. 1059 if (const TypedefType *TT = dyn_cast<TypedefType>(Ty)) { 1060 if (TT->getDecl()->hasAttr<UnusedAttr>()) 1061 return false; 1062 } 1063 1064 // If we failed to complete the type for some reason, or if the type is 1065 // dependent, don't diagnose the variable. 1066 if (Ty->isIncompleteType() || Ty->isDependentType()) 1067 return false; 1068 1069 if (const TagType *TT = Ty->getAs<TagType>()) { 1070 const TagDecl *Tag = TT->getDecl(); 1071 if (Tag->hasAttr<UnusedAttr>()) 1072 return false; 1073 1074 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Tag)) { 1075 // FIXME: Checking for the presence of a user-declared constructor 1076 // isn't completely accurate; we'd prefer to check that the initializer 1077 // has no side effects. 1078 if (RD->hasUserDeclaredConstructor() || !RD->hasTrivialDestructor()) 1079 return false; 1080 } 1081 } 1082 1083 // TODO: __attribute__((unused)) templates? 1084 } 1085 1086 return true; 1087} 1088 1089static void GenerateFixForUnusedDecl(const NamedDecl *D, ASTContext &Ctx, 1090 FixItHint &Hint) { 1091 if (isa<LabelDecl>(D)) { 1092 SourceLocation AfterColon = Lexer::findLocationAfterToken(D->getLocEnd(), 1093 tok::colon, Ctx.getSourceManager(), Ctx.getLangOptions(), true); 1094 if (AfterColon.isInvalid()) 1095 return; 1096 Hint = FixItHint::CreateRemoval(CharSourceRange:: 1097 getCharRange(D->getLocStart(), AfterColon)); 1098 } 1099 return; 1100} 1101 1102/// DiagnoseUnusedDecl - Emit warnings about declarations that are not used 1103/// unless they are marked attr(unused). 1104void Sema::DiagnoseUnusedDecl(const NamedDecl *D) { 1105 FixItHint Hint; 1106 if (!ShouldDiagnoseUnusedDecl(D)) 1107 return; 1108 1109 GenerateFixForUnusedDecl(D, Context, Hint); 1110 1111 unsigned DiagID; 1112 if (isa<VarDecl>(D) && cast<VarDecl>(D)->isExceptionVariable()) 1113 DiagID = diag::warn_unused_exception_param; 1114 else if (isa<LabelDecl>(D)) 1115 DiagID = diag::warn_unused_label; 1116 else 1117 DiagID = diag::warn_unused_variable; 1118 1119 Diag(D->getLocation(), DiagID) << D->getDeclName() << Hint; 1120} 1121 1122static void CheckPoppedLabel(LabelDecl *L, Sema &S) { 1123 // Verify that we have no forward references left. If so, there was a goto 1124 // or address of a label taken, but no definition of it. Label fwd 1125 // definitions are indicated with a null substmt. 1126 if (L->getStmt() == 0) 1127 S.Diag(L->getLocation(), diag::err_undeclared_label_use) <<L->getDeclName(); 1128} 1129 1130void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) { 1131 if (S->decl_empty()) return; 1132 assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) && 1133 "Scope shouldn't contain decls!"); 1134 1135 for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end(); 1136 I != E; ++I) { 1137 Decl *TmpD = (*I); 1138 assert(TmpD && "This decl didn't get pushed??"); 1139 1140 assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?"); 1141 NamedDecl *D = cast<NamedDecl>(TmpD); 1142 1143 if (!D->getDeclName()) continue; 1144 1145 // Diagnose unused variables in this scope. 1146 if (!S->hasErrorOccurred()) 1147 DiagnoseUnusedDecl(D); 1148 1149 // If this was a forward reference to a label, verify it was defined. 1150 if (LabelDecl *LD = dyn_cast<LabelDecl>(D)) 1151 CheckPoppedLabel(LD, *this); 1152 1153 // Remove this name from our lexical scope. 1154 IdResolver.RemoveDecl(D); 1155 } 1156} 1157 1158/// \brief Look for an Objective-C class in the translation unit. 1159/// 1160/// \param Id The name of the Objective-C class we're looking for. If 1161/// typo-correction fixes this name, the Id will be updated 1162/// to the fixed name. 1163/// 1164/// \param IdLoc The location of the name in the translation unit. 1165/// 1166/// \param TypoCorrection If true, this routine will attempt typo correction 1167/// if there is no class with the given name. 1168/// 1169/// \returns The declaration of the named Objective-C class, or NULL if the 1170/// class could not be found. 1171ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *&Id, 1172 SourceLocation IdLoc, 1173 bool DoTypoCorrection) { 1174 // The third "scope" argument is 0 since we aren't enabling lazy built-in 1175 // creation from this context. 1176 NamedDecl *IDecl = LookupSingleName(TUScope, Id, IdLoc, LookupOrdinaryName); 1177 1178 if (!IDecl && DoTypoCorrection) { 1179 // Perform typo correction at the given location, but only if we 1180 // find an Objective-C class name. 1181 TypoCorrection C; 1182 if ((C = CorrectTypo(DeclarationNameInfo(Id, IdLoc), LookupOrdinaryName, 1183 TUScope, NULL, NULL, false, CTC_NoKeywords)) && 1184 (IDecl = C.getCorrectionDeclAs<ObjCInterfaceDecl>())) { 1185 Diag(IdLoc, diag::err_undef_interface_suggest) 1186 << Id << IDecl->getDeclName() 1187 << FixItHint::CreateReplacement(IdLoc, IDecl->getNameAsString()); 1188 Diag(IDecl->getLocation(), diag::note_previous_decl) 1189 << IDecl->getDeclName(); 1190 1191 Id = IDecl->getIdentifier(); 1192 } 1193 } 1194 1195 return dyn_cast_or_null<ObjCInterfaceDecl>(IDecl); 1196} 1197 1198/// getNonFieldDeclScope - Retrieves the innermost scope, starting 1199/// from S, where a non-field would be declared. This routine copes 1200/// with the difference between C and C++ scoping rules in structs and 1201/// unions. For example, the following code is well-formed in C but 1202/// ill-formed in C++: 1203/// @code 1204/// struct S6 { 1205/// enum { BAR } e; 1206/// }; 1207/// 1208/// void test_S6() { 1209/// struct S6 a; 1210/// a.e = BAR; 1211/// } 1212/// @endcode 1213/// For the declaration of BAR, this routine will return a different 1214/// scope. The scope S will be the scope of the unnamed enumeration 1215/// within S6. In C++, this routine will return the scope associated 1216/// with S6, because the enumeration's scope is a transparent 1217/// context but structures can contain non-field names. In C, this 1218/// routine will return the translation unit scope, since the 1219/// enumeration's scope is a transparent context and structures cannot 1220/// contain non-field names. 1221Scope *Sema::getNonFieldDeclScope(Scope *S) { 1222 while (((S->getFlags() & Scope::DeclScope) == 0) || 1223 (S->getEntity() && 1224 ((DeclContext *)S->getEntity())->isTransparentContext()) || 1225 (S->isClassScope() && !getLangOptions().CPlusPlus)) 1226 S = S->getParent(); 1227 return S; 1228} 1229 1230/// LazilyCreateBuiltin - The specified Builtin-ID was first used at 1231/// file scope. lazily create a decl for it. ForRedeclaration is true 1232/// if we're creating this built-in in anticipation of redeclaring the 1233/// built-in. 1234NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid, 1235 Scope *S, bool ForRedeclaration, 1236 SourceLocation Loc) { 1237 Builtin::ID BID = (Builtin::ID)bid; 1238 1239 ASTContext::GetBuiltinTypeError Error; 1240 QualType R = Context.GetBuiltinType(BID, Error); 1241 switch (Error) { 1242 case ASTContext::GE_None: 1243 // Okay 1244 break; 1245 1246 case ASTContext::GE_Missing_stdio: 1247 if (ForRedeclaration) 1248 Diag(Loc, diag::warn_implicit_decl_requires_stdio) 1249 << Context.BuiltinInfo.GetName(BID); 1250 return 0; 1251 1252 case ASTContext::GE_Missing_setjmp: 1253 if (ForRedeclaration) 1254 Diag(Loc, diag::warn_implicit_decl_requires_setjmp) 1255 << Context.BuiltinInfo.GetName(BID); 1256 return 0; 1257 } 1258 1259 if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) { 1260 Diag(Loc, diag::ext_implicit_lib_function_decl) 1261 << Context.BuiltinInfo.GetName(BID) 1262 << R; 1263 if (Context.BuiltinInfo.getHeaderName(BID) && 1264 Diags.getDiagnosticLevel(diag::ext_implicit_lib_function_decl, Loc) 1265 != Diagnostic::Ignored) 1266 Diag(Loc, diag::note_please_include_header) 1267 << Context.BuiltinInfo.getHeaderName(BID) 1268 << Context.BuiltinInfo.GetName(BID); 1269 } 1270 1271 FunctionDecl *New = FunctionDecl::Create(Context, 1272 Context.getTranslationUnitDecl(), 1273 Loc, Loc, II, R, /*TInfo=*/0, 1274 SC_Extern, 1275 SC_None, false, 1276 /*hasPrototype=*/true); 1277 New->setImplicit(); 1278 1279 // Create Decl objects for each parameter, adding them to the 1280 // FunctionDecl. 1281 if (const FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) { 1282 SmallVector<ParmVarDecl*, 16> Params; 1283 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) { 1284 ParmVarDecl *parm = 1285 ParmVarDecl::Create(Context, New, SourceLocation(), 1286 SourceLocation(), 0, 1287 FT->getArgType(i), /*TInfo=*/0, 1288 SC_None, SC_None, 0); 1289 parm->setScopeInfo(0, i); 1290 Params.push_back(parm); 1291 } 1292 New->setParams(Params.data(), Params.size()); 1293 } 1294 1295 AddKnownFunctionAttributes(New); 1296 1297 // TUScope is the translation-unit scope to insert this function into. 1298 // FIXME: This is hideous. We need to teach PushOnScopeChains to 1299 // relate Scopes to DeclContexts, and probably eliminate CurContext 1300 // entirely, but we're not there yet. 1301 DeclContext *SavedContext = CurContext; 1302 CurContext = Context.getTranslationUnitDecl(); 1303 PushOnScopeChains(New, TUScope); 1304 CurContext = SavedContext; 1305 return New; 1306} 1307 1308/// MergeTypedefNameDecl - We just parsed a typedef 'New' which has the 1309/// same name and scope as a previous declaration 'Old'. Figure out 1310/// how to resolve this situation, merging decls or emitting 1311/// diagnostics as appropriate. If there was an error, set New to be invalid. 1312/// 1313void Sema::MergeTypedefNameDecl(TypedefNameDecl *New, LookupResult &OldDecls) { 1314 // If the new decl is known invalid already, don't bother doing any 1315 // merging checks. 1316 if (New->isInvalidDecl()) return; 1317 1318 // Allow multiple definitions for ObjC built-in typedefs. 1319 // FIXME: Verify the underlying types are equivalent! 1320 if (getLangOptions().ObjC1) { 1321 const IdentifierInfo *TypeID = New->getIdentifier(); 1322 switch (TypeID->getLength()) { 1323 default: break; 1324 case 2: 1325 if (!TypeID->isStr("id")) 1326 break; 1327 Context.setObjCIdRedefinitionType(New->getUnderlyingType()); 1328 // Install the built-in type for 'id', ignoring the current definition. 1329 New->setTypeForDecl(Context.getObjCIdType().getTypePtr()); 1330 return; 1331 case 5: 1332 if (!TypeID->isStr("Class")) 1333 break; 1334 Context.setObjCClassRedefinitionType(New->getUnderlyingType()); 1335 // Install the built-in type for 'Class', ignoring the current definition. 1336 New->setTypeForDecl(Context.getObjCClassType().getTypePtr()); 1337 return; 1338 case 3: 1339 if (!TypeID->isStr("SEL")) 1340 break; 1341 Context.setObjCSelRedefinitionType(New->getUnderlyingType()); 1342 // Install the built-in type for 'SEL', ignoring the current definition. 1343 New->setTypeForDecl(Context.getObjCSelType().getTypePtr()); 1344 return; 1345 } 1346 // Fall through - the typedef name was not a builtin type. 1347 } 1348 1349 // Verify the old decl was also a type. 1350 TypeDecl *Old = OldDecls.getAsSingle<TypeDecl>(); 1351 if (!Old) { 1352 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1353 << New->getDeclName(); 1354 1355 NamedDecl *OldD = OldDecls.getRepresentativeDecl(); 1356 if (OldD->getLocation().isValid()) 1357 Diag(OldD->getLocation(), diag::note_previous_definition); 1358 1359 return New->setInvalidDecl(); 1360 } 1361 1362 // If the old declaration is invalid, just give up here. 1363 if (Old->isInvalidDecl()) 1364 return New->setInvalidDecl(); 1365 1366 // Determine the "old" type we'll use for checking and diagnostics. 1367 QualType OldType; 1368 if (TypedefNameDecl *OldTypedef = dyn_cast<TypedefNameDecl>(Old)) 1369 OldType = OldTypedef->getUnderlyingType(); 1370 else 1371 OldType = Context.getTypeDeclType(Old); 1372 1373 // If the typedef types are not identical, reject them in all languages and 1374 // with any extensions enabled. 1375 1376 if (OldType != New->getUnderlyingType() && 1377 Context.getCanonicalType(OldType) != 1378 Context.getCanonicalType(New->getUnderlyingType())) { 1379 int Kind = 0; 1380 if (isa<TypeAliasDecl>(Old)) 1381 Kind = 1; 1382 Diag(New->getLocation(), diag::err_redefinition_different_typedef) 1383 << Kind << New->getUnderlyingType() << OldType; 1384 if (Old->getLocation().isValid()) 1385 Diag(Old->getLocation(), diag::note_previous_definition); 1386 return New->setInvalidDecl(); 1387 } 1388 1389 // The types match. Link up the redeclaration chain if the old 1390 // declaration was a typedef. 1391 // FIXME: this is a potential source of weirdness if the type 1392 // spellings don't match exactly. 1393 if (TypedefNameDecl *Typedef = dyn_cast<TypedefNameDecl>(Old)) 1394 New->setPreviousDeclaration(Typedef); 1395 1396 if (getLangOptions().Microsoft) 1397 return; 1398 1399 if (getLangOptions().CPlusPlus) { 1400 // C++ [dcl.typedef]p2: 1401 // In a given non-class scope, a typedef specifier can be used to 1402 // redefine the name of any type declared in that scope to refer 1403 // to the type to which it already refers. 1404 if (!isa<CXXRecordDecl>(CurContext)) 1405 return; 1406 1407 // C++0x [dcl.typedef]p4: 1408 // In a given class scope, a typedef specifier can be used to redefine 1409 // any class-name declared in that scope that is not also a typedef-name 1410 // to refer to the type to which it already refers. 1411 // 1412 // This wording came in via DR424, which was a correction to the 1413 // wording in DR56, which accidentally banned code like: 1414 // 1415 // struct S { 1416 // typedef struct A { } A; 1417 // }; 1418 // 1419 // in the C++03 standard. We implement the C++0x semantics, which 1420 // allow the above but disallow 1421 // 1422 // struct S { 1423 // typedef int I; 1424 // typedef int I; 1425 // }; 1426 // 1427 // since that was the intent of DR56. 1428 if (!isa<TypedefNameDecl>(Old)) 1429 return; 1430 1431 Diag(New->getLocation(), diag::err_redefinition) 1432 << New->getDeclName(); 1433 Diag(Old->getLocation(), diag::note_previous_definition); 1434 return New->setInvalidDecl(); 1435 } 1436 1437 // If we have a redefinition of a typedef in C, emit a warning. This warning 1438 // is normally mapped to an error, but can be controlled with 1439 // -Wtypedef-redefinition. If either the original or the redefinition is 1440 // in a system header, don't emit this for compatibility with GCC. 1441 if (getDiagnostics().getSuppressSystemWarnings() && 1442 (Context.getSourceManager().isInSystemHeader(Old->getLocation()) || 1443 Context.getSourceManager().isInSystemHeader(New->getLocation()))) 1444 return; 1445 1446 Diag(New->getLocation(), diag::warn_redefinition_of_typedef) 1447 << New->getDeclName(); 1448 Diag(Old->getLocation(), diag::note_previous_definition); 1449 return; 1450} 1451 1452/// DeclhasAttr - returns true if decl Declaration already has the target 1453/// attribute. 1454static bool 1455DeclHasAttr(const Decl *D, const Attr *A) { 1456 const OwnershipAttr *OA = dyn_cast<OwnershipAttr>(A); 1457 for (Decl::attr_iterator i = D->attr_begin(), e = D->attr_end(); i != e; ++i) 1458 if ((*i)->getKind() == A->getKind()) { 1459 // FIXME: Don't hardcode this check 1460 if (OA && isa<OwnershipAttr>(*i)) 1461 return OA->getOwnKind() == cast<OwnershipAttr>(*i)->getOwnKind(); 1462 return true; 1463 } 1464 1465 return false; 1466} 1467 1468/// mergeDeclAttributes - Copy attributes from the Old decl to the New one. 1469static void mergeDeclAttributes(Decl *newDecl, const Decl *oldDecl, 1470 ASTContext &C, bool mergeDeprecation = true) { 1471 if (!oldDecl->hasAttrs()) 1472 return; 1473 1474 bool foundAny = newDecl->hasAttrs(); 1475 1476 // Ensure that any moving of objects within the allocated map is done before 1477 // we process them. 1478 if (!foundAny) newDecl->setAttrs(AttrVec()); 1479 1480 for (specific_attr_iterator<InheritableAttr> 1481 i = oldDecl->specific_attr_begin<InheritableAttr>(), 1482 e = oldDecl->specific_attr_end<InheritableAttr>(); i != e; ++i) { 1483 // Ignore deprecated and unavailable attributes if requested. 1484 if (!mergeDeprecation && 1485 (isa<DeprecatedAttr>(*i) || isa<UnavailableAttr>(*i))) 1486 continue; 1487 1488 if (!DeclHasAttr(newDecl, *i)) { 1489 InheritableAttr *newAttr = cast<InheritableAttr>((*i)->clone(C)); 1490 newAttr->setInherited(true); 1491 newDecl->addAttr(newAttr); 1492 foundAny = true; 1493 } 1494 } 1495 1496 if (!foundAny) newDecl->dropAttrs(); 1497} 1498 1499/// mergeParamDeclAttributes - Copy attributes from the old parameter 1500/// to the new one. 1501static void mergeParamDeclAttributes(ParmVarDecl *newDecl, 1502 const ParmVarDecl *oldDecl, 1503 ASTContext &C) { 1504 if (!oldDecl->hasAttrs()) 1505 return; 1506 1507 bool foundAny = newDecl->hasAttrs(); 1508 1509 // Ensure that any moving of objects within the allocated map is 1510 // done before we process them. 1511 if (!foundAny) newDecl->setAttrs(AttrVec()); 1512 1513 for (specific_attr_iterator<InheritableParamAttr> 1514 i = oldDecl->specific_attr_begin<InheritableParamAttr>(), 1515 e = oldDecl->specific_attr_end<InheritableParamAttr>(); i != e; ++i) { 1516 if (!DeclHasAttr(newDecl, *i)) { 1517 InheritableAttr *newAttr = cast<InheritableParamAttr>((*i)->clone(C)); 1518 newAttr->setInherited(true); 1519 newDecl->addAttr(newAttr); 1520 foundAny = true; 1521 } 1522 } 1523 1524 if (!foundAny) newDecl->dropAttrs(); 1525} 1526 1527namespace { 1528 1529/// Used in MergeFunctionDecl to keep track of function parameters in 1530/// C. 1531struct GNUCompatibleParamWarning { 1532 ParmVarDecl *OldParm; 1533 ParmVarDecl *NewParm; 1534 QualType PromotedType; 1535}; 1536 1537} 1538 1539/// getSpecialMember - get the special member enum for a method. 1540Sema::CXXSpecialMember Sema::getSpecialMember(const CXXMethodDecl *MD) { 1541 if (const CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(MD)) { 1542 if (Ctor->isDefaultConstructor()) 1543 return Sema::CXXDefaultConstructor; 1544 1545 if (Ctor->isCopyConstructor()) 1546 return Sema::CXXCopyConstructor; 1547 1548 if (Ctor->isMoveConstructor()) 1549 return Sema::CXXMoveConstructor; 1550 } else if (isa<CXXDestructorDecl>(MD)) { 1551 return Sema::CXXDestructor; 1552 } else if (MD->isCopyAssignmentOperator()) { 1553 return Sema::CXXCopyAssignment; 1554 } 1555 1556 return Sema::CXXInvalid; 1557} 1558 1559/// canRedefineFunction - checks if a function can be redefined. Currently, 1560/// only extern inline functions can be redefined, and even then only in 1561/// GNU89 mode. 1562static bool canRedefineFunction(const FunctionDecl *FD, 1563 const LangOptions& LangOpts) { 1564 return ((FD->hasAttr<GNUInlineAttr>() || LangOpts.GNUInline) && 1565 !LangOpts.CPlusPlus && 1566 FD->isInlineSpecified() && 1567 FD->getStorageClass() == SC_Extern); 1568} 1569 1570/// MergeFunctionDecl - We just parsed a function 'New' from 1571/// declarator D which has the same name and scope as a previous 1572/// declaration 'Old'. Figure out how to resolve this situation, 1573/// merging decls or emitting diagnostics as appropriate. 1574/// 1575/// In C++, New and Old must be declarations that are not 1576/// overloaded. Use IsOverload to determine whether New and Old are 1577/// overloaded, and to select the Old declaration that New should be 1578/// merged with. 1579/// 1580/// Returns true if there was an error, false otherwise. 1581bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD) { 1582 // Verify the old decl was also a function. 1583 FunctionDecl *Old = 0; 1584 if (FunctionTemplateDecl *OldFunctionTemplate 1585 = dyn_cast<FunctionTemplateDecl>(OldD)) 1586 Old = OldFunctionTemplate->getTemplatedDecl(); 1587 else 1588 Old = dyn_cast<FunctionDecl>(OldD); 1589 if (!Old) { 1590 if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(OldD)) { 1591 Diag(New->getLocation(), diag::err_using_decl_conflict_reverse); 1592 Diag(Shadow->getTargetDecl()->getLocation(), 1593 diag::note_using_decl_target); 1594 Diag(Shadow->getUsingDecl()->getLocation(), 1595 diag::note_using_decl) << 0; 1596 return true; 1597 } 1598 1599 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1600 << New->getDeclName(); 1601 Diag(OldD->getLocation(), diag::note_previous_definition); 1602 return true; 1603 } 1604 1605 // Determine whether the previous declaration was a definition, 1606 // implicit declaration, or a declaration. 1607 diag::kind PrevDiag; 1608 if (Old->isThisDeclarationADefinition()) 1609 PrevDiag = diag::note_previous_definition; 1610 else if (Old->isImplicit()) 1611 PrevDiag = diag::note_previous_implicit_declaration; 1612 else 1613 PrevDiag = diag::note_previous_declaration; 1614 1615 QualType OldQType = Context.getCanonicalType(Old->getType()); 1616 QualType NewQType = Context.getCanonicalType(New->getType()); 1617 1618 // Don't complain about this if we're in GNU89 mode and the old function 1619 // is an extern inline function. 1620 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) && 1621 New->getStorageClass() == SC_Static && 1622 Old->getStorageClass() != SC_Static && 1623 !canRedefineFunction(Old, getLangOptions())) { 1624 if (getLangOptions().Microsoft) { 1625 Diag(New->getLocation(), diag::warn_static_non_static) << New; 1626 Diag(Old->getLocation(), PrevDiag); 1627 } else { 1628 Diag(New->getLocation(), diag::err_static_non_static) << New; 1629 Diag(Old->getLocation(), PrevDiag); 1630 return true; 1631 } 1632 } 1633 1634 // If a function is first declared with a calling convention, but is 1635 // later declared or defined without one, the second decl assumes the 1636 // calling convention of the first. 1637 // 1638 // For the new decl, we have to look at the NON-canonical type to tell the 1639 // difference between a function that really doesn't have a calling 1640 // convention and one that is declared cdecl. That's because in 1641 // canonicalization (see ASTContext.cpp), cdecl is canonicalized away 1642 // because it is the default calling convention. 1643 // 1644 // Note also that we DO NOT return at this point, because we still have 1645 // other tests to run. 1646 const FunctionType *OldType = cast<FunctionType>(OldQType); 1647 const FunctionType *NewType = New->getType()->getAs<FunctionType>(); 1648 FunctionType::ExtInfo OldTypeInfo = OldType->getExtInfo(); 1649 FunctionType::ExtInfo NewTypeInfo = NewType->getExtInfo(); 1650 bool RequiresAdjustment = false; 1651 if (OldTypeInfo.getCC() != CC_Default && 1652 NewTypeInfo.getCC() == CC_Default) { 1653 NewTypeInfo = NewTypeInfo.withCallingConv(OldTypeInfo.getCC()); 1654 RequiresAdjustment = true; 1655 } else if (!Context.isSameCallConv(OldTypeInfo.getCC(), 1656 NewTypeInfo.getCC())) { 1657 // Calling conventions really aren't compatible, so complain. 1658 Diag(New->getLocation(), diag::err_cconv_change) 1659 << FunctionType::getNameForCallConv(NewTypeInfo.getCC()) 1660 << (OldTypeInfo.getCC() == CC_Default) 1661 << (OldTypeInfo.getCC() == CC_Default ? "" : 1662 FunctionType::getNameForCallConv(OldTypeInfo.getCC())); 1663 Diag(Old->getLocation(), diag::note_previous_declaration); 1664 return true; 1665 } 1666 1667 // FIXME: diagnose the other way around? 1668 if (OldTypeInfo.getNoReturn() && !NewTypeInfo.getNoReturn()) { 1669 NewTypeInfo = NewTypeInfo.withNoReturn(true); 1670 RequiresAdjustment = true; 1671 } 1672 1673 // Merge regparm attribute. 1674 if (OldTypeInfo.getHasRegParm() != NewTypeInfo.getHasRegParm() || 1675 OldTypeInfo.getRegParm() != NewTypeInfo.getRegParm()) { 1676 if (NewTypeInfo.getHasRegParm()) { 1677 Diag(New->getLocation(), diag::err_regparm_mismatch) 1678 << NewType->getRegParmType() 1679 << OldType->getRegParmType(); 1680 Diag(Old->getLocation(), diag::note_previous_declaration); 1681 return true; 1682 } 1683 1684 NewTypeInfo = NewTypeInfo.withRegParm(OldTypeInfo.getRegParm()); 1685 RequiresAdjustment = true; 1686 } 1687 1688 if (RequiresAdjustment) { 1689 NewType = Context.adjustFunctionType(NewType, NewTypeInfo); 1690 New->setType(QualType(NewType, 0)); 1691 NewQType = Context.getCanonicalType(New->getType()); 1692 } 1693 1694 if (getLangOptions().CPlusPlus) { 1695 // (C++98 13.1p2): 1696 // Certain function declarations cannot be overloaded: 1697 // -- Function declarations that differ only in the return type 1698 // cannot be overloaded. 1699 QualType OldReturnType = OldType->getResultType(); 1700 QualType NewReturnType = cast<FunctionType>(NewQType)->getResultType(); 1701 QualType ResQT; 1702 if (OldReturnType != NewReturnType) { 1703 if (NewReturnType->isObjCObjectPointerType() 1704 && OldReturnType->isObjCObjectPointerType()) 1705 ResQT = Context.mergeObjCGCQualifiers(NewQType, OldQType); 1706 if (ResQT.isNull()) { 1707 if (New->isCXXClassMember() && New->isOutOfLine()) 1708 Diag(New->getLocation(), 1709 diag::err_member_def_does_not_match_ret_type) << New; 1710 else 1711 Diag(New->getLocation(), diag::err_ovl_diff_return_type); 1712 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1713 return true; 1714 } 1715 else 1716 NewQType = ResQT; 1717 } 1718 1719 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 1720 CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 1721 if (OldMethod && NewMethod) { 1722 // Preserve triviality. 1723 NewMethod->setTrivial(OldMethod->isTrivial()); 1724 1725 // MSVC allows explicit template specialization at class scope: 1726 // 2 CXMethodDecls referring to the same function will be injected. 1727 // We don't want a redeclartion error. 1728 bool IsClassScopeExplicitSpecialization = 1729 OldMethod->isFunctionTemplateSpecialization() && 1730 NewMethod->isFunctionTemplateSpecialization(); 1731 bool isFriend = NewMethod->getFriendObjectKind(); 1732 1733 if (!isFriend && NewMethod->getLexicalDeclContext()->isRecord() && 1734 !IsClassScopeExplicitSpecialization) { 1735 // -- Member function declarations with the same name and the 1736 // same parameter types cannot be overloaded if any of them 1737 // is a static member function declaration. 1738 if (OldMethod->isStatic() || NewMethod->isStatic()) { 1739 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 1740 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1741 return true; 1742 } 1743 1744 // C++ [class.mem]p1: 1745 // [...] A member shall not be declared twice in the 1746 // member-specification, except that a nested class or member 1747 // class template can be declared and then later defined. 1748 unsigned NewDiag; 1749 if (isa<CXXConstructorDecl>(OldMethod)) 1750 NewDiag = diag::err_constructor_redeclared; 1751 else if (isa<CXXDestructorDecl>(NewMethod)) 1752 NewDiag = diag::err_destructor_redeclared; 1753 else if (isa<CXXConversionDecl>(NewMethod)) 1754 NewDiag = diag::err_conv_function_redeclared; 1755 else 1756 NewDiag = diag::err_member_redeclared; 1757 1758 Diag(New->getLocation(), NewDiag); 1759 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1760 1761 // Complain if this is an explicit declaration of a special 1762 // member that was initially declared implicitly. 1763 // 1764 // As an exception, it's okay to befriend such methods in order 1765 // to permit the implicit constructor/destructor/operator calls. 1766 } else if (OldMethod->isImplicit()) { 1767 if (isFriend) { 1768 NewMethod->setImplicit(); 1769 } else { 1770 Diag(NewMethod->getLocation(), 1771 diag::err_definition_of_implicitly_declared_member) 1772 << New << getSpecialMember(OldMethod); 1773 return true; 1774 } 1775 } else if (OldMethod->isExplicitlyDefaulted()) { 1776 Diag(NewMethod->getLocation(), 1777 diag::err_definition_of_explicitly_defaulted_member) 1778 << getSpecialMember(OldMethod); 1779 return true; 1780 } 1781 } 1782 1783 // (C++98 8.3.5p3): 1784 // All declarations for a function shall agree exactly in both the 1785 // return type and the parameter-type-list. 1786 // We also want to respect all the extended bits except noreturn. 1787 1788 // noreturn should now match unless the old type info didn't have it. 1789 QualType OldQTypeForComparison = OldQType; 1790 if (!OldTypeInfo.getNoReturn() && NewTypeInfo.getNoReturn()) { 1791 assert(OldQType == QualType(OldType, 0)); 1792 const FunctionType *OldTypeForComparison 1793 = Context.adjustFunctionType(OldType, OldTypeInfo.withNoReturn(true)); 1794 OldQTypeForComparison = QualType(OldTypeForComparison, 0); 1795 assert(OldQTypeForComparison.isCanonical()); 1796 } 1797 1798 if (OldQTypeForComparison == NewQType) 1799 return MergeCompatibleFunctionDecls(New, Old); 1800 1801 // Fall through for conflicting redeclarations and redefinitions. 1802 } 1803 1804 // C: Function types need to be compatible, not identical. This handles 1805 // duplicate function decls like "void f(int); void f(enum X);" properly. 1806 if (!getLangOptions().CPlusPlus && 1807 Context.typesAreCompatible(OldQType, NewQType)) { 1808 const FunctionType *OldFuncType = OldQType->getAs<FunctionType>(); 1809 const FunctionType *NewFuncType = NewQType->getAs<FunctionType>(); 1810 const FunctionProtoType *OldProto = 0; 1811 if (isa<FunctionNoProtoType>(NewFuncType) && 1812 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) { 1813 // The old declaration provided a function prototype, but the 1814 // new declaration does not. Merge in the prototype. 1815 assert(!OldProto->hasExceptionSpec() && "Exception spec in C"); 1816 SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(), 1817 OldProto->arg_type_end()); 1818 NewQType = Context.getFunctionType(NewFuncType->getResultType(), 1819 ParamTypes.data(), ParamTypes.size(), 1820 OldProto->getExtProtoInfo()); 1821 New->setType(NewQType); 1822 New->setHasInheritedPrototype(); 1823 1824 // Synthesize a parameter for each argument type. 1825 SmallVector<ParmVarDecl*, 16> Params; 1826 for (FunctionProtoType::arg_type_iterator 1827 ParamType = OldProto->arg_type_begin(), 1828 ParamEnd = OldProto->arg_type_end(); 1829 ParamType != ParamEnd; ++ParamType) { 1830 ParmVarDecl *Param = ParmVarDecl::Create(Context, New, 1831 SourceLocation(), 1832 SourceLocation(), 0, 1833 *ParamType, /*TInfo=*/0, 1834 SC_None, SC_None, 1835 0); 1836 Param->setScopeInfo(0, Params.size()); 1837 Param->setImplicit(); 1838 Params.push_back(Param); 1839 } 1840 1841 New->setParams(Params.data(), Params.size()); 1842 } 1843 1844 return MergeCompatibleFunctionDecls(New, Old); 1845 } 1846 1847 // GNU C permits a K&R definition to follow a prototype declaration 1848 // if the declared types of the parameters in the K&R definition 1849 // match the types in the prototype declaration, even when the 1850 // promoted types of the parameters from the K&R definition differ 1851 // from the types in the prototype. GCC then keeps the types from 1852 // the prototype. 1853 // 1854 // If a variadic prototype is followed by a non-variadic K&R definition, 1855 // the K&R definition becomes variadic. This is sort of an edge case, but 1856 // it's legal per the standard depending on how you read C99 6.7.5.3p15 and 1857 // C99 6.9.1p8. 1858 if (!getLangOptions().CPlusPlus && 1859 Old->hasPrototype() && !New->hasPrototype() && 1860 New->getType()->getAs<FunctionProtoType>() && 1861 Old->getNumParams() == New->getNumParams()) { 1862 SmallVector<QualType, 16> ArgTypes; 1863 SmallVector<GNUCompatibleParamWarning, 16> Warnings; 1864 const FunctionProtoType *OldProto 1865 = Old->getType()->getAs<FunctionProtoType>(); 1866 const FunctionProtoType *NewProto 1867 = New->getType()->getAs<FunctionProtoType>(); 1868 1869 // Determine whether this is the GNU C extension. 1870 QualType MergedReturn = Context.mergeTypes(OldProto->getResultType(), 1871 NewProto->getResultType()); 1872 bool LooseCompatible = !MergedReturn.isNull(); 1873 for (unsigned Idx = 0, End = Old->getNumParams(); 1874 LooseCompatible && Idx != End; ++Idx) { 1875 ParmVarDecl *OldParm = Old->getParamDecl(Idx); 1876 ParmVarDecl *NewParm = New->getParamDecl(Idx); 1877 if (Context.typesAreCompatible(OldParm->getType(), 1878 NewProto->getArgType(Idx))) { 1879 ArgTypes.push_back(NewParm->getType()); 1880 } else if (Context.typesAreCompatible(OldParm->getType(), 1881 NewParm->getType(), 1882 /*CompareUnqualified=*/true)) { 1883 GNUCompatibleParamWarning Warn 1884 = { OldParm, NewParm, NewProto->getArgType(Idx) }; 1885 Warnings.push_back(Warn); 1886 ArgTypes.push_back(NewParm->getType()); 1887 } else 1888 LooseCompatible = false; 1889 } 1890 1891 if (LooseCompatible) { 1892 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) { 1893 Diag(Warnings[Warn].NewParm->getLocation(), 1894 diag::ext_param_promoted_not_compatible_with_prototype) 1895 << Warnings[Warn].PromotedType 1896 << Warnings[Warn].OldParm->getType(); 1897 if (Warnings[Warn].OldParm->getLocation().isValid()) 1898 Diag(Warnings[Warn].OldParm->getLocation(), 1899 diag::note_previous_declaration); 1900 } 1901 1902 New->setType(Context.getFunctionType(MergedReturn, &ArgTypes[0], 1903 ArgTypes.size(), 1904 OldProto->getExtProtoInfo())); 1905 return MergeCompatibleFunctionDecls(New, Old); 1906 } 1907 1908 // Fall through to diagnose conflicting types. 1909 } 1910 1911 // A function that has already been declared has been redeclared or defined 1912 // with a different type- show appropriate diagnostic 1913 if (unsigned BuiltinID = Old->getBuiltinID()) { 1914 // The user has declared a builtin function with an incompatible 1915 // signature. 1916 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 1917 // The function the user is redeclaring is a library-defined 1918 // function like 'malloc' or 'printf'. Warn about the 1919 // redeclaration, then pretend that we don't know about this 1920 // library built-in. 1921 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; 1922 Diag(Old->getLocation(), diag::note_previous_builtin_declaration) 1923 << Old << Old->getType(); 1924 New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin); 1925 Old->setInvalidDecl(); 1926 return false; 1927 } 1928 1929 PrevDiag = diag::note_previous_builtin_declaration; 1930 } 1931 1932 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 1933 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1934 return true; 1935} 1936 1937/// \brief Completes the merge of two function declarations that are 1938/// known to be compatible. 1939/// 1940/// This routine handles the merging of attributes and other 1941/// properties of function declarations form the old declaration to 1942/// the new declaration, once we know that New is in fact a 1943/// redeclaration of Old. 1944/// 1945/// \returns false 1946bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old) { 1947 // Merge the attributes 1948 mergeDeclAttributes(New, Old, Context); 1949 1950 // Merge the storage class. 1951 if (Old->getStorageClass() != SC_Extern && 1952 Old->getStorageClass() != SC_None) 1953 New->setStorageClass(Old->getStorageClass()); 1954 1955 // Merge "pure" flag. 1956 if (Old->isPure()) 1957 New->setPure(); 1958 1959 // Merge attributes from the parameters. These can mismatch with K&R 1960 // declarations. 1961 if (New->getNumParams() == Old->getNumParams()) 1962 for (unsigned i = 0, e = New->getNumParams(); i != e; ++i) 1963 mergeParamDeclAttributes(New->getParamDecl(i), Old->getParamDecl(i), 1964 Context); 1965 1966 if (getLangOptions().CPlusPlus) 1967 return MergeCXXFunctionDecl(New, Old); 1968 1969 return false; 1970} 1971 1972 1973void Sema::mergeObjCMethodDecls(ObjCMethodDecl *newMethod, 1974 const ObjCMethodDecl *oldMethod) { 1975 // We don't want to merge unavailable and deprecated attributes 1976 // except from interface to implementation. 1977 bool mergeDeprecation = isa<ObjCImplDecl>(newMethod->getDeclContext()); 1978 1979 // Merge the attributes. 1980 mergeDeclAttributes(newMethod, oldMethod, Context, mergeDeprecation); 1981 1982 // Merge attributes from the parameters. 1983 for (ObjCMethodDecl::param_iterator oi = oldMethod->param_begin(), 1984 ni = newMethod->param_begin(), ne = newMethod->param_end(); 1985 ni != ne; ++ni, ++oi) 1986 mergeParamDeclAttributes(*ni, *oi, Context); 1987 1988 CheckObjCMethodOverride(newMethod, oldMethod, true); 1989} 1990 1991/// MergeVarDeclTypes - We parsed a variable 'New' which has the same name and 1992/// scope as a previous declaration 'Old'. Figure out how to merge their types, 1993/// emitting diagnostics as appropriate. 1994/// 1995/// Declarations using the auto type specifier (C++ [decl.spec.auto]) call back 1996/// to here in AddInitializerToDecl and AddCXXDirectInitializerToDecl. We can't 1997/// check them before the initializer is attached. 1998/// 1999void Sema::MergeVarDeclTypes(VarDecl *New, VarDecl *Old) { 2000 if (New->isInvalidDecl() || Old->isInvalidDecl()) 2001 return; 2002 2003 QualType MergedT; 2004 if (getLangOptions().CPlusPlus) { 2005 AutoType *AT = New->getType()->getContainedAutoType(); 2006 if (AT && !AT->isDeduced()) { 2007 // We don't know what the new type is until the initializer is attached. 2008 return; 2009 } else if (Context.hasSameType(New->getType(), Old->getType())) { 2010 // These could still be something that needs exception specs checked. 2011 return MergeVarDeclExceptionSpecs(New, Old); 2012 } 2013 // C++ [basic.link]p10: 2014 // [...] the types specified by all declarations referring to a given 2015 // object or function shall be identical, except that declarations for an 2016 // array object can specify array types that differ by the presence or 2017 // absence of a major array bound (8.3.4). 2018 else if (Old->getType()->isIncompleteArrayType() && 2019 New->getType()->isArrayType()) { 2020 CanQual<ArrayType> OldArray 2021 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 2022 CanQual<ArrayType> NewArray 2023 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 2024 if (OldArray->getElementType() == NewArray->getElementType()) 2025 MergedT = New->getType(); 2026 } else if (Old->getType()->isArrayType() && 2027 New->getType()->isIncompleteArrayType()) { 2028 CanQual<ArrayType> OldArray 2029 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 2030 CanQual<ArrayType> NewArray 2031 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 2032 if (OldArray->getElementType() == NewArray->getElementType()) 2033 MergedT = Old->getType(); 2034 } else if (New->getType()->isObjCObjectPointerType() 2035 && Old->getType()->isObjCObjectPointerType()) { 2036 MergedT = Context.mergeObjCGCQualifiers(New->getType(), 2037 Old->getType()); 2038 } 2039 } else { 2040 MergedT = Context.mergeTypes(New->getType(), Old->getType()); 2041 } 2042 if (MergedT.isNull()) { 2043 Diag(New->getLocation(), diag::err_redefinition_different_type) 2044 << New->getDeclName(); 2045 Diag(Old->getLocation(), diag::note_previous_definition); 2046 return New->setInvalidDecl(); 2047 } 2048 New->setType(MergedT); 2049} 2050 2051/// MergeVarDecl - We just parsed a variable 'New' which has the same name 2052/// and scope as a previous declaration 'Old'. Figure out how to resolve this 2053/// situation, merging decls or emitting diagnostics as appropriate. 2054/// 2055/// Tentative definition rules (C99 6.9.2p2) are checked by 2056/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 2057/// definitions here, since the initializer hasn't been attached. 2058/// 2059void Sema::MergeVarDecl(VarDecl *New, LookupResult &Previous) { 2060 // If the new decl is already invalid, don't do any other checking. 2061 if (New->isInvalidDecl()) 2062 return; 2063 2064 // Verify the old decl was also a variable. 2065 VarDecl *Old = 0; 2066 if (!Previous.isSingleResult() || 2067 !(Old = dyn_cast<VarDecl>(Previous.getFoundDecl()))) { 2068 Diag(New->getLocation(), diag::err_redefinition_different_kind) 2069 << New->getDeclName(); 2070 Diag(Previous.getRepresentativeDecl()->getLocation(), 2071 diag::note_previous_definition); 2072 return New->setInvalidDecl(); 2073 } 2074 2075 // C++ [class.mem]p1: 2076 // A member shall not be declared twice in the member-specification [...] 2077 // 2078 // Here, we need only consider static data members. 2079 if (Old->isStaticDataMember() && !New->isOutOfLine()) { 2080 Diag(New->getLocation(), diag::err_duplicate_member) 2081 << New->getIdentifier(); 2082 Diag(Old->getLocation(), diag::note_previous_declaration); 2083 New->setInvalidDecl(); 2084 } 2085 2086 mergeDeclAttributes(New, Old, Context); 2087 // Warn if an already-declared variable is made a weak_import in a subsequent declaration 2088 if (New->getAttr<WeakImportAttr>() && 2089 Old->getStorageClass() == SC_None && 2090 !Old->getAttr<WeakImportAttr>()) { 2091 Diag(New->getLocation(), diag::warn_weak_import) << New->getDeclName(); 2092 Diag(Old->getLocation(), diag::note_previous_definition); 2093 // Remove weak_import attribute on new declaration. 2094 New->dropAttr<WeakImportAttr>(); 2095 } 2096 2097 // Merge the types. 2098 MergeVarDeclTypes(New, Old); 2099 if (New->isInvalidDecl()) 2100 return; 2101 2102 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 2103 if (New->getStorageClass() == SC_Static && 2104 (Old->getStorageClass() == SC_None || Old->hasExternalStorage())) { 2105 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 2106 Diag(Old->getLocation(), diag::note_previous_definition); 2107 return New->setInvalidDecl(); 2108 } 2109 // C99 6.2.2p4: 2110 // For an identifier declared with the storage-class specifier 2111 // extern in a scope in which a prior declaration of that 2112 // identifier is visible,23) if the prior declaration specifies 2113 // internal or external linkage, the linkage of the identifier at 2114 // the later declaration is the same as the linkage specified at 2115 // the prior declaration. If no prior declaration is visible, or 2116 // if the prior declaration specifies no linkage, then the 2117 // identifier has external linkage. 2118 if (New->hasExternalStorage() && Old->hasLinkage()) 2119 /* Okay */; 2120 else if (New->getStorageClass() != SC_Static && 2121 Old->getStorageClass() == SC_Static) { 2122 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 2123 Diag(Old->getLocation(), diag::note_previous_definition); 2124 return New->setInvalidDecl(); 2125 } 2126 2127 // Check if extern is followed by non-extern and vice-versa. 2128 if (New->hasExternalStorage() && 2129 !Old->hasLinkage() && Old->isLocalVarDecl()) { 2130 Diag(New->getLocation(), diag::err_extern_non_extern) << New->getDeclName(); 2131 Diag(Old->getLocation(), diag::note_previous_definition); 2132 return New->setInvalidDecl(); 2133 } 2134 if (Old->hasExternalStorage() && 2135 !New->hasLinkage() && New->isLocalVarDecl()) { 2136 Diag(New->getLocation(), diag::err_non_extern_extern) << New->getDeclName(); 2137 Diag(Old->getLocation(), diag::note_previous_definition); 2138 return New->setInvalidDecl(); 2139 } 2140 2141 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 2142 2143 // FIXME: The test for external storage here seems wrong? We still 2144 // need to check for mismatches. 2145 if (!New->hasExternalStorage() && !New->isFileVarDecl() && 2146 // Don't complain about out-of-line definitions of static members. 2147 !(Old->getLexicalDeclContext()->isRecord() && 2148 !New->getLexicalDeclContext()->isRecord())) { 2149 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 2150 Diag(Old->getLocation(), diag::note_previous_definition); 2151 return New->setInvalidDecl(); 2152 } 2153 2154 if (New->isThreadSpecified() && !Old->isThreadSpecified()) { 2155 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName(); 2156 Diag(Old->getLocation(), diag::note_previous_definition); 2157 } else if (!New->isThreadSpecified() && Old->isThreadSpecified()) { 2158 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName(); 2159 Diag(Old->getLocation(), diag::note_previous_definition); 2160 } 2161 2162 // C++ doesn't have tentative definitions, so go right ahead and check here. 2163 const VarDecl *Def; 2164 if (getLangOptions().CPlusPlus && 2165 New->isThisDeclarationADefinition() == VarDecl::Definition && 2166 (Def = Old->getDefinition())) { 2167 Diag(New->getLocation(), diag::err_redefinition) 2168 << New->getDeclName(); 2169 Diag(Def->getLocation(), diag::note_previous_definition); 2170 New->setInvalidDecl(); 2171 return; 2172 } 2173 // c99 6.2.2 P4. 2174 // For an identifier declared with the storage-class specifier extern in a 2175 // scope in which a prior declaration of that identifier is visible, if 2176 // the prior declaration specifies internal or external linkage, the linkage 2177 // of the identifier at the later declaration is the same as the linkage 2178 // specified at the prior declaration. 2179 // FIXME. revisit this code. 2180 if (New->hasExternalStorage() && 2181 Old->getLinkage() == InternalLinkage && 2182 New->getDeclContext() == Old->getDeclContext()) 2183 New->setStorageClass(Old->getStorageClass()); 2184 2185 // Keep a chain of previous declarations. 2186 New->setPreviousDeclaration(Old); 2187 2188 // Inherit access appropriately. 2189 New->setAccess(Old->getAccess()); 2190} 2191 2192/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2193/// no declarator (e.g. "struct foo;") is parsed. 2194Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2195 DeclSpec &DS) { 2196 return ParsedFreeStandingDeclSpec(S, AS, DS, 2197 MultiTemplateParamsArg(*this, 0, 0)); 2198} 2199 2200/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2201/// no declarator (e.g. "struct foo;") is parsed. It also accopts template 2202/// parameters to cope with template friend declarations. 2203Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2204 DeclSpec &DS, 2205 MultiTemplateParamsArg TemplateParams) { 2206 Decl *TagD = 0; 2207 TagDecl *Tag = 0; 2208 if (DS.getTypeSpecType() == DeclSpec::TST_class || 2209 DS.getTypeSpecType() == DeclSpec::TST_struct || 2210 DS.getTypeSpecType() == DeclSpec::TST_union || 2211 DS.getTypeSpecType() == DeclSpec::TST_enum) { 2212 TagD = DS.getRepAsDecl(); 2213 2214 if (!TagD) // We probably had an error 2215 return 0; 2216 2217 // Note that the above type specs guarantee that the 2218 // type rep is a Decl, whereas in many of the others 2219 // it's a Type. 2220 Tag = dyn_cast<TagDecl>(TagD); 2221 } 2222 2223 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 2224 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 2225 // or incomplete types shall not be restrict-qualified." 2226 if (TypeQuals & DeclSpec::TQ_restrict) 2227 Diag(DS.getRestrictSpecLoc(), 2228 diag::err_typecheck_invalid_restrict_not_pointer_noarg) 2229 << DS.getSourceRange(); 2230 } 2231 2232 if (DS.isConstexprSpecified()) { 2233 // C++0x [dcl.constexpr]p1: constexpr can only be applied to declarations 2234 // and definitions of functions and variables. 2235 if (Tag) 2236 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_tag) 2237 << (DS.getTypeSpecType() == DeclSpec::TST_class ? 0 : 2238 DS.getTypeSpecType() == DeclSpec::TST_struct ? 1 : 2239 DS.getTypeSpecType() == DeclSpec::TST_union ? 2 : 3); 2240 else 2241 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_no_declarators); 2242 // Don't emit warnings after this error. 2243 return TagD; 2244 } 2245 2246 if (DS.isFriendSpecified()) { 2247 // If we're dealing with a decl but not a TagDecl, assume that 2248 // whatever routines created it handled the friendship aspect. 2249 if (TagD && !Tag) 2250 return 0; 2251 return ActOnFriendTypeDecl(S, DS, TemplateParams); 2252 } 2253 2254 // Track whether we warned about the fact that there aren't any 2255 // declarators. 2256 bool emittedWarning = false; 2257 2258 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 2259 ProcessDeclAttributeList(S, Record, DS.getAttributes().getList()); 2260 2261 if (!Record->getDeclName() && Record->isDefinition() && 2262 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { 2263 if (getLangOptions().CPlusPlus || 2264 Record->getDeclContext()->isRecord()) 2265 return BuildAnonymousStructOrUnion(S, DS, AS, Record); 2266 2267 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 2268 << DS.getSourceRange(); 2269 emittedWarning = true; 2270 } 2271 } 2272 2273 // Check for Microsoft C extension: anonymous struct. 2274 if (getLangOptions().Microsoft && !getLangOptions().CPlusPlus && 2275 CurContext->isRecord() && 2276 DS.getStorageClassSpec() == DeclSpec::SCS_unspecified) { 2277 // Handle 2 kinds of anonymous struct: 2278 // struct STRUCT; 2279 // and 2280 // STRUCT_TYPE; <- where STRUCT_TYPE is a typedef struct. 2281 RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag); 2282 if ((Record && Record->getDeclName() && !Record->isDefinition()) || 2283 (DS.getTypeSpecType() == DeclSpec::TST_typename && 2284 DS.getRepAsType().get()->isStructureType())) { 2285 Diag(DS.getSourceRange().getBegin(), diag::ext_ms_anonymous_struct) 2286 << DS.getSourceRange(); 2287 return BuildMicrosoftCAnonymousStruct(S, DS, Record); 2288 } 2289 } 2290 2291 if (getLangOptions().CPlusPlus && 2292 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) 2293 if (EnumDecl *Enum = dyn_cast_or_null<EnumDecl>(Tag)) 2294 if (Enum->enumerator_begin() == Enum->enumerator_end() && 2295 !Enum->getIdentifier() && !Enum->isInvalidDecl()) { 2296 Diag(Enum->getLocation(), diag::ext_no_declarators) 2297 << DS.getSourceRange(); 2298 emittedWarning = true; 2299 } 2300 2301 // Skip all the checks below if we have a type error. 2302 if (DS.getTypeSpecType() == DeclSpec::TST_error) return TagD; 2303 2304 if (!DS.isMissingDeclaratorOk()) { 2305 // Warn about typedefs of enums without names, since this is an 2306 // extension in both Microsoft and GNU. 2307 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 2308 Tag && isa<EnumDecl>(Tag)) { 2309 Diag(DS.getSourceRange().getBegin(), diag::ext_typedef_without_a_name) 2310 << DS.getSourceRange(); 2311 return Tag; 2312 } 2313 2314 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 2315 << DS.getSourceRange(); 2316 emittedWarning = true; 2317 } 2318 2319 // We're going to complain about a bunch of spurious specifiers; 2320 // only do this if we're declaring a tag, because otherwise we 2321 // should be getting diag::ext_no_declarators. 2322 if (emittedWarning || (TagD && TagD->isInvalidDecl())) 2323 return TagD; 2324 2325 // Note that a linkage-specification sets a storage class, but 2326 // 'extern "C" struct foo;' is actually valid and not theoretically 2327 // useless. 2328 if (DeclSpec::SCS scs = DS.getStorageClassSpec()) 2329 if (!DS.isExternInLinkageSpec()) 2330 Diag(DS.getStorageClassSpecLoc(), diag::warn_standalone_specifier) 2331 << DeclSpec::getSpecifierName(scs); 2332 2333 if (DS.isThreadSpecified()) 2334 Diag(DS.getThreadSpecLoc(), diag::warn_standalone_specifier) << "__thread"; 2335 if (DS.getTypeQualifiers()) { 2336 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2337 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "const"; 2338 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2339 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "volatile"; 2340 // Restrict is covered above. 2341 } 2342 if (DS.isInlineSpecified()) 2343 Diag(DS.getInlineSpecLoc(), diag::warn_standalone_specifier) << "inline"; 2344 if (DS.isVirtualSpecified()) 2345 Diag(DS.getVirtualSpecLoc(), diag::warn_standalone_specifier) << "virtual"; 2346 if (DS.isExplicitSpecified()) 2347 Diag(DS.getExplicitSpecLoc(), diag::warn_standalone_specifier) <<"explicit"; 2348 2349 // FIXME: Warn on useless attributes 2350 2351 return TagD; 2352} 2353 2354/// ActOnVlaStmt - This rouine if finds a vla expression in a decl spec. 2355/// builds a statement for it and returns it so it is evaluated. 2356StmtResult Sema::ActOnVlaStmt(const DeclSpec &DS) { 2357 StmtResult R; 2358 if (DS.getTypeSpecType() == DeclSpec::TST_typeofExpr) { 2359 Expr *Exp = DS.getRepAsExpr(); 2360 QualType Ty = Exp->getType(); 2361 if (Ty->isPointerType()) { 2362 do 2363 Ty = Ty->getAs<PointerType>()->getPointeeType(); 2364 while (Ty->isPointerType()); 2365 } 2366 if (Ty->isVariableArrayType()) { 2367 R = ActOnExprStmt(MakeFullExpr(Exp)); 2368 } 2369 } 2370 return R; 2371} 2372 2373/// We are trying to inject an anonymous member into the given scope; 2374/// check if there's an existing declaration that can't be overloaded. 2375/// 2376/// \return true if this is a forbidden redeclaration 2377static bool CheckAnonMemberRedeclaration(Sema &SemaRef, 2378 Scope *S, 2379 DeclContext *Owner, 2380 DeclarationName Name, 2381 SourceLocation NameLoc, 2382 unsigned diagnostic) { 2383 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupMemberName, 2384 Sema::ForRedeclaration); 2385 if (!SemaRef.LookupName(R, S)) return false; 2386 2387 if (R.getAsSingle<TagDecl>()) 2388 return false; 2389 2390 // Pick a representative declaration. 2391 NamedDecl *PrevDecl = R.getRepresentativeDecl()->getUnderlyingDecl(); 2392 assert(PrevDecl && "Expected a non-null Decl"); 2393 2394 if (!SemaRef.isDeclInScope(PrevDecl, Owner, S)) 2395 return false; 2396 2397 SemaRef.Diag(NameLoc, diagnostic) << Name; 2398 SemaRef.Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 2399 2400 return true; 2401} 2402 2403/// InjectAnonymousStructOrUnionMembers - Inject the members of the 2404/// anonymous struct or union AnonRecord into the owning context Owner 2405/// and scope S. This routine will be invoked just after we realize 2406/// that an unnamed union or struct is actually an anonymous union or 2407/// struct, e.g., 2408/// 2409/// @code 2410/// union { 2411/// int i; 2412/// float f; 2413/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 2414/// // f into the surrounding scope.x 2415/// @endcode 2416/// 2417/// This routine is recursive, injecting the names of nested anonymous 2418/// structs/unions into the owning context and scope as well. 2419static bool InjectAnonymousStructOrUnionMembers(Sema &SemaRef, Scope *S, 2420 DeclContext *Owner, 2421 RecordDecl *AnonRecord, 2422 AccessSpecifier AS, 2423 SmallVector<NamedDecl*, 2> &Chaining, 2424 bool MSAnonStruct) { 2425 unsigned diagKind 2426 = AnonRecord->isUnion() ? diag::err_anonymous_union_member_redecl 2427 : diag::err_anonymous_struct_member_redecl; 2428 2429 bool Invalid = false; 2430 2431 // Look every FieldDecl and IndirectFieldDecl with a name. 2432 for (RecordDecl::decl_iterator D = AnonRecord->decls_begin(), 2433 DEnd = AnonRecord->decls_end(); 2434 D != DEnd; ++D) { 2435 if ((isa<FieldDecl>(*D) || isa<IndirectFieldDecl>(*D)) && 2436 cast<NamedDecl>(*D)->getDeclName()) { 2437 ValueDecl *VD = cast<ValueDecl>(*D); 2438 if (CheckAnonMemberRedeclaration(SemaRef, S, Owner, VD->getDeclName(), 2439 VD->getLocation(), diagKind)) { 2440 // C++ [class.union]p2: 2441 // The names of the members of an anonymous union shall be 2442 // distinct from the names of any other entity in the 2443 // scope in which the anonymous union is declared. 2444 Invalid = true; 2445 } else { 2446 // C++ [class.union]p2: 2447 // For the purpose of name lookup, after the anonymous union 2448 // definition, the members of the anonymous union are 2449 // considered to have been defined in the scope in which the 2450 // anonymous union is declared. 2451 unsigned OldChainingSize = Chaining.size(); 2452 if (IndirectFieldDecl *IF = dyn_cast<IndirectFieldDecl>(VD)) 2453 for (IndirectFieldDecl::chain_iterator PI = IF->chain_begin(), 2454 PE = IF->chain_end(); PI != PE; ++PI) 2455 Chaining.push_back(*PI); 2456 else 2457 Chaining.push_back(VD); 2458 2459 assert(Chaining.size() >= 2); 2460 NamedDecl **NamedChain = 2461 new (SemaRef.Context)NamedDecl*[Chaining.size()]; 2462 for (unsigned i = 0; i < Chaining.size(); i++) 2463 NamedChain[i] = Chaining[i]; 2464 2465 IndirectFieldDecl* IndirectField = 2466 IndirectFieldDecl::Create(SemaRef.Context, Owner, VD->getLocation(), 2467 VD->getIdentifier(), VD->getType(), 2468 NamedChain, Chaining.size()); 2469 2470 IndirectField->setAccess(AS); 2471 IndirectField->setImplicit(); 2472 SemaRef.PushOnScopeChains(IndirectField, S); 2473 2474 // That includes picking up the appropriate access specifier. 2475 if (AS != AS_none) IndirectField->setAccess(AS); 2476 2477 Chaining.resize(OldChainingSize); 2478 } 2479 } 2480 } 2481 2482 return Invalid; 2483} 2484 2485/// StorageClassSpecToVarDeclStorageClass - Maps a DeclSpec::SCS to 2486/// a VarDecl::StorageClass. Any error reporting is up to the caller: 2487/// illegal input values are mapped to SC_None. 2488static StorageClass 2489StorageClassSpecToVarDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2490 switch (StorageClassSpec) { 2491 case DeclSpec::SCS_unspecified: return SC_None; 2492 case DeclSpec::SCS_extern: return SC_Extern; 2493 case DeclSpec::SCS_static: return SC_Static; 2494 case DeclSpec::SCS_auto: return SC_Auto; 2495 case DeclSpec::SCS_register: return SC_Register; 2496 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2497 // Illegal SCSs map to None: error reporting is up to the caller. 2498 case DeclSpec::SCS_mutable: // Fall through. 2499 case DeclSpec::SCS_typedef: return SC_None; 2500 } 2501 llvm_unreachable("unknown storage class specifier"); 2502} 2503 2504/// StorageClassSpecToFunctionDeclStorageClass - Maps a DeclSpec::SCS to 2505/// a StorageClass. Any error reporting is up to the caller: 2506/// illegal input values are mapped to SC_None. 2507static StorageClass 2508StorageClassSpecToFunctionDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2509 switch (StorageClassSpec) { 2510 case DeclSpec::SCS_unspecified: return SC_None; 2511 case DeclSpec::SCS_extern: return SC_Extern; 2512 case DeclSpec::SCS_static: return SC_Static; 2513 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2514 // Illegal SCSs map to None: error reporting is up to the caller. 2515 case DeclSpec::SCS_auto: // Fall through. 2516 case DeclSpec::SCS_mutable: // Fall through. 2517 case DeclSpec::SCS_register: // Fall through. 2518 case DeclSpec::SCS_typedef: return SC_None; 2519 } 2520 llvm_unreachable("unknown storage class specifier"); 2521} 2522 2523/// BuildAnonymousStructOrUnion - Handle the declaration of an 2524/// anonymous structure or union. Anonymous unions are a C++ feature 2525/// (C++ [class.union]) and a GNU C extension; anonymous structures 2526/// are a GNU C and GNU C++ extension. 2527Decl *Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 2528 AccessSpecifier AS, 2529 RecordDecl *Record) { 2530 DeclContext *Owner = Record->getDeclContext(); 2531 2532 // Diagnose whether this anonymous struct/union is an extension. 2533 if (Record->isUnion() && !getLangOptions().CPlusPlus) 2534 Diag(Record->getLocation(), diag::ext_anonymous_union); 2535 else if (!Record->isUnion()) 2536 Diag(Record->getLocation(), diag::ext_anonymous_struct); 2537 2538 // C and C++ require different kinds of checks for anonymous 2539 // structs/unions. 2540 bool Invalid = false; 2541 if (getLangOptions().CPlusPlus) { 2542 const char* PrevSpec = 0; 2543 unsigned DiagID; 2544 // C++ [class.union]p3: 2545 // Anonymous unions declared in a named namespace or in the 2546 // global namespace shall be declared static. 2547 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 2548 (isa<TranslationUnitDecl>(Owner) || 2549 (isa<NamespaceDecl>(Owner) && 2550 cast<NamespaceDecl>(Owner)->getDeclName()))) { 2551 Diag(Record->getLocation(), diag::err_anonymous_union_not_static); 2552 Invalid = true; 2553 2554 // Recover by adding 'static'. 2555 DS.SetStorageClassSpec(DeclSpec::SCS_static, SourceLocation(), 2556 PrevSpec, DiagID, getLangOptions()); 2557 } 2558 // C++ [class.union]p3: 2559 // A storage class is not allowed in a declaration of an 2560 // anonymous union in a class scope. 2561 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 2562 isa<RecordDecl>(Owner)) { 2563 Diag(DS.getStorageClassSpecLoc(), 2564 diag::err_anonymous_union_with_storage_spec); 2565 Invalid = true; 2566 2567 // Recover by removing the storage specifier. 2568 DS.SetStorageClassSpec(DeclSpec::SCS_unspecified, SourceLocation(), 2569 PrevSpec, DiagID, getLangOptions()); 2570 } 2571 2572 // Ignore const/volatile/restrict qualifiers. 2573 if (DS.getTypeQualifiers()) { 2574 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2575 Diag(DS.getConstSpecLoc(), diag::ext_anonymous_struct_union_qualified) 2576 << Record->isUnion() << 0 2577 << FixItHint::CreateRemoval(DS.getConstSpecLoc()); 2578 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2579 Diag(DS.getVolatileSpecLoc(), diag::ext_anonymous_struct_union_qualified) 2580 << Record->isUnion() << 1 2581 << FixItHint::CreateRemoval(DS.getVolatileSpecLoc()); 2582 if (DS.getTypeQualifiers() & DeclSpec::TQ_restrict) 2583 Diag(DS.getRestrictSpecLoc(), diag::ext_anonymous_struct_union_qualified) 2584 << Record->isUnion() << 2 2585 << FixItHint::CreateRemoval(DS.getRestrictSpecLoc()); 2586 2587 DS.ClearTypeQualifiers(); 2588 } 2589 2590 // C++ [class.union]p2: 2591 // The member-specification of an anonymous union shall only 2592 // define non-static data members. [Note: nested types and 2593 // functions cannot be declared within an anonymous union. ] 2594 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 2595 MemEnd = Record->decls_end(); 2596 Mem != MemEnd; ++Mem) { 2597 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 2598 // C++ [class.union]p3: 2599 // An anonymous union shall not have private or protected 2600 // members (clause 11). 2601 assert(FD->getAccess() != AS_none); 2602 if (FD->getAccess() != AS_public) { 2603 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 2604 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 2605 Invalid = true; 2606 } 2607 2608 // C++ [class.union]p1 2609 // An object of a class with a non-trivial constructor, a non-trivial 2610 // copy constructor, a non-trivial destructor, or a non-trivial copy 2611 // assignment operator cannot be a member of a union, nor can an 2612 // array of such objects. 2613 if (!getLangOptions().CPlusPlus0x && CheckNontrivialField(FD)) 2614 Invalid = true; 2615 } else if ((*Mem)->isImplicit()) { 2616 // Any implicit members are fine. 2617 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 2618 // This is a type that showed up in an 2619 // elaborated-type-specifier inside the anonymous struct or 2620 // union, but which actually declares a type outside of the 2621 // anonymous struct or union. It's okay. 2622 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 2623 if (!MemRecord->isAnonymousStructOrUnion() && 2624 MemRecord->getDeclName()) { 2625 // Visual C++ allows type definition in anonymous struct or union. 2626 if (getLangOptions().Microsoft) 2627 Diag(MemRecord->getLocation(), diag::ext_anonymous_record_with_type) 2628 << (int)Record->isUnion(); 2629 else { 2630 // This is a nested type declaration. 2631 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 2632 << (int)Record->isUnion(); 2633 Invalid = true; 2634 } 2635 } 2636 } else if (isa<AccessSpecDecl>(*Mem)) { 2637 // Any access specifier is fine. 2638 } else { 2639 // We have something that isn't a non-static data 2640 // member. Complain about it. 2641 unsigned DK = diag::err_anonymous_record_bad_member; 2642 if (isa<TypeDecl>(*Mem)) 2643 DK = diag::err_anonymous_record_with_type; 2644 else if (isa<FunctionDecl>(*Mem)) 2645 DK = diag::err_anonymous_record_with_function; 2646 else if (isa<VarDecl>(*Mem)) 2647 DK = diag::err_anonymous_record_with_static; 2648 2649 // Visual C++ allows type definition in anonymous struct or union. 2650 if (getLangOptions().Microsoft && 2651 DK == diag::err_anonymous_record_with_type) 2652 Diag((*Mem)->getLocation(), diag::ext_anonymous_record_with_type) 2653 << (int)Record->isUnion(); 2654 else { 2655 Diag((*Mem)->getLocation(), DK) 2656 << (int)Record->isUnion(); 2657 Invalid = true; 2658 } 2659 } 2660 } 2661 } 2662 2663 if (!Record->isUnion() && !Owner->isRecord()) { 2664 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 2665 << (int)getLangOptions().CPlusPlus; 2666 Invalid = true; 2667 } 2668 2669 // Mock up a declarator. 2670 Declarator Dc(DS, Declarator::MemberContext); 2671 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2672 assert(TInfo && "couldn't build declarator info for anonymous struct/union"); 2673 2674 // Create a declaration for this anonymous struct/union. 2675 NamedDecl *Anon = 0; 2676 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 2677 Anon = FieldDecl::Create(Context, OwningClass, 2678 DS.getSourceRange().getBegin(), 2679 Record->getLocation(), 2680 /*IdentifierInfo=*/0, 2681 Context.getTypeDeclType(Record), 2682 TInfo, 2683 /*BitWidth=*/0, /*Mutable=*/false, 2684 /*HasInit=*/false); 2685 Anon->setAccess(AS); 2686 if (getLangOptions().CPlusPlus) 2687 FieldCollector->Add(cast<FieldDecl>(Anon)); 2688 } else { 2689 DeclSpec::SCS SCSpec = DS.getStorageClassSpec(); 2690 assert(SCSpec != DeclSpec::SCS_typedef && 2691 "Parser allowed 'typedef' as storage class VarDecl."); 2692 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 2693 if (SCSpec == DeclSpec::SCS_mutable) { 2694 // mutable can only appear on non-static class members, so it's always 2695 // an error here 2696 Diag(Record->getLocation(), diag::err_mutable_nonmember); 2697 Invalid = true; 2698 SC = SC_None; 2699 } 2700 SCSpec = DS.getStorageClassSpecAsWritten(); 2701 VarDecl::StorageClass SCAsWritten 2702 = StorageClassSpecToVarDeclStorageClass(SCSpec); 2703 2704 Anon = VarDecl::Create(Context, Owner, 2705 DS.getSourceRange().getBegin(), 2706 Record->getLocation(), /*IdentifierInfo=*/0, 2707 Context.getTypeDeclType(Record), 2708 TInfo, SC, SCAsWritten); 2709 } 2710 Anon->setImplicit(); 2711 2712 // Add the anonymous struct/union object to the current 2713 // context. We'll be referencing this object when we refer to one of 2714 // its members. 2715 Owner->addDecl(Anon); 2716 2717 // Inject the members of the anonymous struct/union into the owning 2718 // context and into the identifier resolver chain for name lookup 2719 // purposes. 2720 SmallVector<NamedDecl*, 2> Chain; 2721 Chain.push_back(Anon); 2722 2723 if (InjectAnonymousStructOrUnionMembers(*this, S, Owner, Record, AS, 2724 Chain, false)) 2725 Invalid = true; 2726 2727 // Mark this as an anonymous struct/union type. Note that we do not 2728 // do this until after we have already checked and injected the 2729 // members of this anonymous struct/union type, because otherwise 2730 // the members could be injected twice: once by DeclContext when it 2731 // builds its lookup table, and once by 2732 // InjectAnonymousStructOrUnionMembers. 2733 Record->setAnonymousStructOrUnion(true); 2734 2735 if (Invalid) 2736 Anon->setInvalidDecl(); 2737 2738 return Anon; 2739} 2740 2741/// BuildMicrosoftCAnonymousStruct - Handle the declaration of an 2742/// Microsoft C anonymous structure. 2743/// Ref: http://msdn.microsoft.com/en-us/library/z2cx9y4f.aspx 2744/// Example: 2745/// 2746/// struct A { int a; }; 2747/// struct B { struct A; int b; }; 2748/// 2749/// void foo() { 2750/// B var; 2751/// var.a = 3; 2752/// } 2753/// 2754Decl *Sema::BuildMicrosoftCAnonymousStruct(Scope *S, DeclSpec &DS, 2755 RecordDecl *Record) { 2756 2757 // If there is no Record, get the record via the typedef. 2758 if (!Record) 2759 Record = DS.getRepAsType().get()->getAsStructureType()->getDecl(); 2760 2761 // Mock up a declarator. 2762 Declarator Dc(DS, Declarator::TypeNameContext); 2763 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2764 assert(TInfo && "couldn't build declarator info for anonymous struct"); 2765 2766 // Create a declaration for this anonymous struct. 2767 NamedDecl* Anon = FieldDecl::Create(Context, 2768 cast<RecordDecl>(CurContext), 2769 DS.getSourceRange().getBegin(), 2770 DS.getSourceRange().getBegin(), 2771 /*IdentifierInfo=*/0, 2772 Context.getTypeDeclType(Record), 2773 TInfo, 2774 /*BitWidth=*/0, /*Mutable=*/false, 2775 /*HasInit=*/false); 2776 Anon->setImplicit(); 2777 2778 // Add the anonymous struct object to the current context. 2779 CurContext->addDecl(Anon); 2780 2781 // Inject the members of the anonymous struct into the current 2782 // context and into the identifier resolver chain for name lookup 2783 // purposes. 2784 SmallVector<NamedDecl*, 2> Chain; 2785 Chain.push_back(Anon); 2786 2787 if (InjectAnonymousStructOrUnionMembers(*this, S, CurContext, 2788 Record->getDefinition(), 2789 AS_none, Chain, true)) 2790 Anon->setInvalidDecl(); 2791 2792 return Anon; 2793} 2794 2795/// GetNameForDeclarator - Determine the full declaration name for the 2796/// given Declarator. 2797DeclarationNameInfo Sema::GetNameForDeclarator(Declarator &D) { 2798 return GetNameFromUnqualifiedId(D.getName()); 2799} 2800 2801/// \brief Retrieves the declaration name from a parsed unqualified-id. 2802DeclarationNameInfo 2803Sema::GetNameFromUnqualifiedId(const UnqualifiedId &Name) { 2804 DeclarationNameInfo NameInfo; 2805 NameInfo.setLoc(Name.StartLocation); 2806 2807 switch (Name.getKind()) { 2808 2809 case UnqualifiedId::IK_ImplicitSelfParam: 2810 case UnqualifiedId::IK_Identifier: 2811 NameInfo.setName(Name.Identifier); 2812 NameInfo.setLoc(Name.StartLocation); 2813 return NameInfo; 2814 2815 case UnqualifiedId::IK_OperatorFunctionId: 2816 NameInfo.setName(Context.DeclarationNames.getCXXOperatorName( 2817 Name.OperatorFunctionId.Operator)); 2818 NameInfo.setLoc(Name.StartLocation); 2819 NameInfo.getInfo().CXXOperatorName.BeginOpNameLoc 2820 = Name.OperatorFunctionId.SymbolLocations[0]; 2821 NameInfo.getInfo().CXXOperatorName.EndOpNameLoc 2822 = Name.EndLocation.getRawEncoding(); 2823 return NameInfo; 2824 2825 case UnqualifiedId::IK_LiteralOperatorId: 2826 NameInfo.setName(Context.DeclarationNames.getCXXLiteralOperatorName( 2827 Name.Identifier)); 2828 NameInfo.setLoc(Name.StartLocation); 2829 NameInfo.setCXXLiteralOperatorNameLoc(Name.EndLocation); 2830 return NameInfo; 2831 2832 case UnqualifiedId::IK_ConversionFunctionId: { 2833 TypeSourceInfo *TInfo; 2834 QualType Ty = GetTypeFromParser(Name.ConversionFunctionId, &TInfo); 2835 if (Ty.isNull()) 2836 return DeclarationNameInfo(); 2837 NameInfo.setName(Context.DeclarationNames.getCXXConversionFunctionName( 2838 Context.getCanonicalType(Ty))); 2839 NameInfo.setLoc(Name.StartLocation); 2840 NameInfo.setNamedTypeInfo(TInfo); 2841 return NameInfo; 2842 } 2843 2844 case UnqualifiedId::IK_ConstructorName: { 2845 TypeSourceInfo *TInfo; 2846 QualType Ty = GetTypeFromParser(Name.ConstructorName, &TInfo); 2847 if (Ty.isNull()) 2848 return DeclarationNameInfo(); 2849 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 2850 Context.getCanonicalType(Ty))); 2851 NameInfo.setLoc(Name.StartLocation); 2852 NameInfo.setNamedTypeInfo(TInfo); 2853 return NameInfo; 2854 } 2855 2856 case UnqualifiedId::IK_ConstructorTemplateId: { 2857 // In well-formed code, we can only have a constructor 2858 // template-id that refers to the current context, so go there 2859 // to find the actual type being constructed. 2860 CXXRecordDecl *CurClass = dyn_cast<CXXRecordDecl>(CurContext); 2861 if (!CurClass || CurClass->getIdentifier() != Name.TemplateId->Name) 2862 return DeclarationNameInfo(); 2863 2864 // Determine the type of the class being constructed. 2865 QualType CurClassType = Context.getTypeDeclType(CurClass); 2866 2867 // FIXME: Check two things: that the template-id names the same type as 2868 // CurClassType, and that the template-id does not occur when the name 2869 // was qualified. 2870 2871 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 2872 Context.getCanonicalType(CurClassType))); 2873 NameInfo.setLoc(Name.StartLocation); 2874 // FIXME: should we retrieve TypeSourceInfo? 2875 NameInfo.setNamedTypeInfo(0); 2876 return NameInfo; 2877 } 2878 2879 case UnqualifiedId::IK_DestructorName: { 2880 TypeSourceInfo *TInfo; 2881 QualType Ty = GetTypeFromParser(Name.DestructorName, &TInfo); 2882 if (Ty.isNull()) 2883 return DeclarationNameInfo(); 2884 NameInfo.setName(Context.DeclarationNames.getCXXDestructorName( 2885 Context.getCanonicalType(Ty))); 2886 NameInfo.setLoc(Name.StartLocation); 2887 NameInfo.setNamedTypeInfo(TInfo); 2888 return NameInfo; 2889 } 2890 2891 case UnqualifiedId::IK_TemplateId: { 2892 TemplateName TName = Name.TemplateId->Template.get(); 2893 SourceLocation TNameLoc = Name.TemplateId->TemplateNameLoc; 2894 return Context.getNameForTemplate(TName, TNameLoc); 2895 } 2896 2897 } // switch (Name.getKind()) 2898 2899 assert(false && "Unknown name kind"); 2900 return DeclarationNameInfo(); 2901} 2902 2903static QualType getCoreType(QualType Ty) { 2904 do { 2905 if (Ty->isPointerType() || Ty->isReferenceType()) 2906 Ty = Ty->getPointeeType(); 2907 else if (Ty->isArrayType()) 2908 Ty = Ty->castAsArrayTypeUnsafe()->getElementType(); 2909 else 2910 return Ty.withoutLocalFastQualifiers(); 2911 } while (true); 2912} 2913 2914/// isNearlyMatchingFunction - Determine whether the C++ functions 2915/// Declaration and Definition are "nearly" matching. This heuristic 2916/// is used to improve diagnostics in the case where an out-of-line 2917/// function definition doesn't match any declaration within the class 2918/// or namespace. Also sets Params to the list of indices to the 2919/// parameters that differ between the declaration and the definition. 2920static bool isNearlyMatchingFunction(ASTContext &Context, 2921 FunctionDecl *Declaration, 2922 FunctionDecl *Definition, 2923 llvm::SmallVectorImpl<unsigned> &Params) { 2924 Params.clear(); 2925 if (Declaration->param_size() != Definition->param_size()) 2926 return false; 2927 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 2928 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 2929 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 2930 2931 // The parameter types are identical 2932 if (DefParamTy == DeclParamTy) 2933 continue; 2934 2935 QualType DeclParamBaseTy = getCoreType(DeclParamTy); 2936 QualType DefParamBaseTy = getCoreType(DefParamTy); 2937 const IdentifierInfo *DeclTyName = DeclParamBaseTy.getBaseTypeIdentifier(); 2938 const IdentifierInfo *DefTyName = DefParamBaseTy.getBaseTypeIdentifier(); 2939 2940 if (Context.hasSameUnqualifiedType(DeclParamBaseTy, DefParamBaseTy) || 2941 (DeclTyName && DeclTyName == DefTyName)) 2942 Params.push_back(Idx); 2943 else // The two parameters aren't even close 2944 return false; 2945 } 2946 2947 return true; 2948} 2949 2950/// NeedsRebuildingInCurrentInstantiation - Checks whether the given 2951/// declarator needs to be rebuilt in the current instantiation. 2952/// Any bits of declarator which appear before the name are valid for 2953/// consideration here. That's specifically the type in the decl spec 2954/// and the base type in any member-pointer chunks. 2955static bool RebuildDeclaratorInCurrentInstantiation(Sema &S, Declarator &D, 2956 DeclarationName Name) { 2957 // The types we specifically need to rebuild are: 2958 // - typenames, typeofs, and decltypes 2959 // - types which will become injected class names 2960 // Of course, we also need to rebuild any type referencing such a 2961 // type. It's safest to just say "dependent", but we call out a 2962 // few cases here. 2963 2964 DeclSpec &DS = D.getMutableDeclSpec(); 2965 switch (DS.getTypeSpecType()) { 2966 case DeclSpec::TST_typename: 2967 case DeclSpec::TST_typeofType: 2968 case DeclSpec::TST_decltype: 2969 case DeclSpec::TST_underlyingType: { 2970 // Grab the type from the parser. 2971 TypeSourceInfo *TSI = 0; 2972 QualType T = S.GetTypeFromParser(DS.getRepAsType(), &TSI); 2973 if (T.isNull() || !T->isDependentType()) break; 2974 2975 // Make sure there's a type source info. This isn't really much 2976 // of a waste; most dependent types should have type source info 2977 // attached already. 2978 if (!TSI) 2979 TSI = S.Context.getTrivialTypeSourceInfo(T, DS.getTypeSpecTypeLoc()); 2980 2981 // Rebuild the type in the current instantiation. 2982 TSI = S.RebuildTypeInCurrentInstantiation(TSI, D.getIdentifierLoc(), Name); 2983 if (!TSI) return true; 2984 2985 // Store the new type back in the decl spec. 2986 ParsedType LocType = S.CreateParsedType(TSI->getType(), TSI); 2987 DS.UpdateTypeRep(LocType); 2988 break; 2989 } 2990 2991 case DeclSpec::TST_typeofExpr: { 2992 Expr *E = DS.getRepAsExpr(); 2993 ExprResult Result = S.RebuildExprInCurrentInstantiation(E); 2994 if (Result.isInvalid()) return true; 2995 DS.UpdateExprRep(Result.get()); 2996 break; 2997 } 2998 2999 default: 3000 // Nothing to do for these decl specs. 3001 break; 3002 } 3003 3004 // It doesn't matter what order we do this in. 3005 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) { 3006 DeclaratorChunk &Chunk = D.getTypeObject(I); 3007 3008 // The only type information in the declarator which can come 3009 // before the declaration name is the base type of a member 3010 // pointer. 3011 if (Chunk.Kind != DeclaratorChunk::MemberPointer) 3012 continue; 3013 3014 // Rebuild the scope specifier in-place. 3015 CXXScopeSpec &SS = Chunk.Mem.Scope(); 3016 if (S.RebuildNestedNameSpecifierInCurrentInstantiation(SS)) 3017 return true; 3018 } 3019 3020 return false; 3021} 3022 3023Decl *Sema::ActOnDeclarator(Scope *S, Declarator &D) { 3024 return HandleDeclarator(S, D, MultiTemplateParamsArg(*this), 3025 /*IsFunctionDefinition=*/false); 3026} 3027 3028/// DiagnoseClassNameShadow - Implement C++ [class.mem]p13: 3029/// If T is the name of a class, then each of the following shall have a 3030/// name different from T: 3031/// - every static data member of class T; 3032/// - every member function of class T 3033/// - every member of class T that is itself a type; 3034/// \returns true if the declaration name violates these rules. 3035bool Sema::DiagnoseClassNameShadow(DeclContext *DC, 3036 DeclarationNameInfo NameInfo) { 3037 DeclarationName Name = NameInfo.getName(); 3038 3039 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(DC)) 3040 if (Record->getIdentifier() && Record->getDeclName() == Name) { 3041 Diag(NameInfo.getLoc(), diag::err_member_name_of_class) << Name; 3042 return true; 3043 } 3044 3045 return false; 3046} 3047 3048Decl *Sema::HandleDeclarator(Scope *S, Declarator &D, 3049 MultiTemplateParamsArg TemplateParamLists, 3050 bool IsFunctionDefinition) { 3051 // TODO: consider using NameInfo for diagnostic. 3052 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 3053 DeclarationName Name = NameInfo.getName(); 3054 3055 // All of these full declarators require an identifier. If it doesn't have 3056 // one, the ParsedFreeStandingDeclSpec action should be used. 3057 if (!Name) { 3058 if (!D.isInvalidType()) // Reject this if we think it is valid. 3059 Diag(D.getDeclSpec().getSourceRange().getBegin(), 3060 diag::err_declarator_need_ident) 3061 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 3062 return 0; 3063 } else if (DiagnoseUnexpandedParameterPack(NameInfo, UPPC_DeclarationType)) 3064 return 0; 3065 3066 // The scope passed in may not be a decl scope. Zip up the scope tree until 3067 // we find one that is. 3068 while ((S->getFlags() & Scope::DeclScope) == 0 || 3069 (S->getFlags() & Scope::TemplateParamScope) != 0) 3070 S = S->getParent(); 3071 3072 DeclContext *DC = CurContext; 3073 if (D.getCXXScopeSpec().isInvalid()) 3074 D.setInvalidType(); 3075 else if (D.getCXXScopeSpec().isSet()) { 3076 if (DiagnoseUnexpandedParameterPack(D.getCXXScopeSpec(), 3077 UPPC_DeclarationQualifier)) 3078 return 0; 3079 3080 bool EnteringContext = !D.getDeclSpec().isFriendSpecified(); 3081 DC = computeDeclContext(D.getCXXScopeSpec(), EnteringContext); 3082 if (!DC) { 3083 // If we could not compute the declaration context, it's because the 3084 // declaration context is dependent but does not refer to a class, 3085 // class template, or class template partial specialization. Complain 3086 // and return early, to avoid the coming semantic disaster. 3087 Diag(D.getIdentifierLoc(), 3088 diag::err_template_qualified_declarator_no_match) 3089 << (NestedNameSpecifier*)D.getCXXScopeSpec().getScopeRep() 3090 << D.getCXXScopeSpec().getRange(); 3091 return 0; 3092 } 3093 bool IsDependentContext = DC->isDependentContext(); 3094 3095 if (!IsDependentContext && 3096 RequireCompleteDeclContext(D.getCXXScopeSpec(), DC)) 3097 return 0; 3098 3099 if (isa<CXXRecordDecl>(DC)) { 3100 if (!cast<CXXRecordDecl>(DC)->hasDefinition()) { 3101 Diag(D.getIdentifierLoc(), 3102 diag::err_member_def_undefined_record) 3103 << Name << DC << D.getCXXScopeSpec().getRange(); 3104 D.setInvalidType(); 3105 } else if (isa<CXXRecordDecl>(CurContext) && 3106 !D.getDeclSpec().isFriendSpecified()) { 3107 // The user provided a superfluous scope specifier inside a class 3108 // definition: 3109 // 3110 // class X { 3111 // void X::f(); 3112 // }; 3113 if (CurContext->Equals(DC)) 3114 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 3115 << Name << FixItHint::CreateRemoval(D.getCXXScopeSpec().getRange()); 3116 else 3117 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 3118 << Name << D.getCXXScopeSpec().getRange(); 3119 3120 // Pretend that this qualifier was not here. 3121 D.getCXXScopeSpec().clear(); 3122 } 3123 } 3124 3125 // Check whether we need to rebuild the type of the given 3126 // declaration in the current instantiation. 3127 if (EnteringContext && IsDependentContext && 3128 TemplateParamLists.size() != 0) { 3129 ContextRAII SavedContext(*this, DC); 3130 if (RebuildDeclaratorInCurrentInstantiation(*this, D, Name)) 3131 D.setInvalidType(); 3132 } 3133 } 3134 3135 if (DiagnoseClassNameShadow(DC, NameInfo)) 3136 // If this is a typedef, we'll end up spewing multiple diagnostics. 3137 // Just return early; it's safer. 3138 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3139 return 0; 3140 3141 NamedDecl *New; 3142 3143 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 3144 QualType R = TInfo->getType(); 3145 3146 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 3147 UPPC_DeclarationType)) 3148 D.setInvalidType(); 3149 3150 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 3151 ForRedeclaration); 3152 3153 // See if this is a redefinition of a variable in the same scope. 3154 if (!D.getCXXScopeSpec().isSet()) { 3155 bool IsLinkageLookup = false; 3156 3157 // If the declaration we're planning to build will be a function 3158 // or object with linkage, then look for another declaration with 3159 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 3160 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3161 /* Do nothing*/; 3162 else if (R->isFunctionType()) { 3163 if (CurContext->isFunctionOrMethod() || 3164 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3165 IsLinkageLookup = true; 3166 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 3167 IsLinkageLookup = true; 3168 else if (CurContext->getRedeclContext()->isTranslationUnit() && 3169 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3170 IsLinkageLookup = true; 3171 3172 if (IsLinkageLookup) 3173 Previous.clear(LookupRedeclarationWithLinkage); 3174 3175 LookupName(Previous, S, /* CreateBuiltins = */ IsLinkageLookup); 3176 } else { // Something like "int foo::x;" 3177 LookupQualifiedName(Previous, DC); 3178 3179 // Don't consider using declarations as previous declarations for 3180 // out-of-line members. 3181 RemoveUsingDecls(Previous); 3182 3183 // C++ 7.3.1.2p2: 3184 // Members (including explicit specializations of templates) of a named 3185 // namespace can also be defined outside that namespace by explicit 3186 // qualification of the name being defined, provided that the entity being 3187 // defined was already declared in the namespace and the definition appears 3188 // after the point of declaration in a namespace that encloses the 3189 // declarations namespace. 3190 // 3191 // Note that we only check the context at this point. We don't yet 3192 // have enough information to make sure that PrevDecl is actually 3193 // the declaration we want to match. For example, given: 3194 // 3195 // class X { 3196 // void f(); 3197 // void f(float); 3198 // }; 3199 // 3200 // void X::f(int) { } // ill-formed 3201 // 3202 // In this case, PrevDecl will point to the overload set 3203 // containing the two f's declared in X, but neither of them 3204 // matches. 3205 3206 // First check whether we named the global scope. 3207 if (isa<TranslationUnitDecl>(DC)) { 3208 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 3209 << Name << D.getCXXScopeSpec().getRange(); 3210 } else { 3211 DeclContext *Cur = CurContext; 3212 while (isa<LinkageSpecDecl>(Cur)) 3213 Cur = Cur->getParent(); 3214 if (!Cur->Encloses(DC)) { 3215 // The qualifying scope doesn't enclose the original declaration. 3216 // Emit diagnostic based on current scope. 3217 SourceLocation L = D.getIdentifierLoc(); 3218 SourceRange R = D.getCXXScopeSpec().getRange(); 3219 if (isa<FunctionDecl>(Cur)) 3220 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 3221 else 3222 Diag(L, diag::err_invalid_declarator_scope) 3223 << Name << cast<NamedDecl>(DC) << R; 3224 D.setInvalidType(); 3225 } 3226 } 3227 } 3228 3229 if (Previous.isSingleResult() && 3230 Previous.getFoundDecl()->isTemplateParameter()) { 3231 // Maybe we will complain about the shadowed template parameter. 3232 if (!D.isInvalidType()) 3233 if (DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), 3234 Previous.getFoundDecl())) 3235 D.setInvalidType(); 3236 3237 // Just pretend that we didn't see the previous declaration. 3238 Previous.clear(); 3239 } 3240 3241 // In C++, the previous declaration we find might be a tag type 3242 // (class or enum). In this case, the new declaration will hide the 3243 // tag type. Note that this does does not apply if we're declaring a 3244 // typedef (C++ [dcl.typedef]p4). 3245 if (Previous.isSingleTagDecl() && 3246 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 3247 Previous.clear(); 3248 3249 bool Redeclaration = false; 3250 bool AddToScope = true; 3251 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 3252 if (TemplateParamLists.size()) { 3253 Diag(D.getIdentifierLoc(), diag::err_template_typedef); 3254 return 0; 3255 } 3256 3257 New = ActOnTypedefDeclarator(S, D, DC, R, TInfo, Previous, Redeclaration); 3258 } else if (R->isFunctionType()) { 3259 New = ActOnFunctionDeclarator(S, D, DC, R, TInfo, Previous, 3260 move(TemplateParamLists), 3261 IsFunctionDefinition, Redeclaration, 3262 AddToScope); 3263 } else { 3264 New = ActOnVariableDeclarator(S, D, DC, R, TInfo, Previous, 3265 move(TemplateParamLists), 3266 Redeclaration); 3267 } 3268 3269 if (New == 0) 3270 return 0; 3271 3272 // If this has an identifier and is not an invalid redeclaration or 3273 // function template specialization, add it to the scope stack. 3274 if (New->getDeclName() && AddToScope && 3275 !(Redeclaration && New->isInvalidDecl())) 3276 PushOnScopeChains(New, S); 3277 3278 return New; 3279} 3280 3281/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 3282/// types into constant array types in certain situations which would otherwise 3283/// be errors (for GCC compatibility). 3284static QualType TryToFixInvalidVariablyModifiedType(QualType T, 3285 ASTContext &Context, 3286 bool &SizeIsNegative, 3287 llvm::APSInt &Oversized) { 3288 // This method tries to turn a variable array into a constant 3289 // array even when the size isn't an ICE. This is necessary 3290 // for compatibility with code that depends on gcc's buggy 3291 // constant expression folding, like struct {char x[(int)(char*)2];} 3292 SizeIsNegative = false; 3293 Oversized = 0; 3294 3295 if (T->isDependentType()) 3296 return QualType(); 3297 3298 QualifierCollector Qs; 3299 const Type *Ty = Qs.strip(T); 3300 3301 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) { 3302 QualType Pointee = PTy->getPointeeType(); 3303 QualType FixedType = 3304 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative, 3305 Oversized); 3306 if (FixedType.isNull()) return FixedType; 3307 FixedType = Context.getPointerType(FixedType); 3308 return Qs.apply(Context, FixedType); 3309 } 3310 if (const ParenType* PTy = dyn_cast<ParenType>(Ty)) { 3311 QualType Inner = PTy->getInnerType(); 3312 QualType FixedType = 3313 TryToFixInvalidVariablyModifiedType(Inner, Context, SizeIsNegative, 3314 Oversized); 3315 if (FixedType.isNull()) return FixedType; 3316 FixedType = Context.getParenType(FixedType); 3317 return Qs.apply(Context, FixedType); 3318 } 3319 3320 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 3321 if (!VLATy) 3322 return QualType(); 3323 // FIXME: We should probably handle this case 3324 if (VLATy->getElementType()->isVariablyModifiedType()) 3325 return QualType(); 3326 3327 Expr::EvalResult EvalResult; 3328 if (!VLATy->getSizeExpr() || 3329 !VLATy->getSizeExpr()->Evaluate(EvalResult, Context) || 3330 !EvalResult.Val.isInt()) 3331 return QualType(); 3332 3333 // Check whether the array size is negative. 3334 llvm::APSInt &Res = EvalResult.Val.getInt(); 3335 if (Res.isSigned() && Res.isNegative()) { 3336 SizeIsNegative = true; 3337 return QualType(); 3338 } 3339 3340 // Check whether the array is too large to be addressed. 3341 unsigned ActiveSizeBits 3342 = ConstantArrayType::getNumAddressingBits(Context, VLATy->getElementType(), 3343 Res); 3344 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) { 3345 Oversized = Res; 3346 return QualType(); 3347 } 3348 3349 return Context.getConstantArrayType(VLATy->getElementType(), 3350 Res, ArrayType::Normal, 0); 3351} 3352 3353/// \brief Register the given locally-scoped external C declaration so 3354/// that it can be found later for redeclarations 3355void 3356Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, 3357 const LookupResult &Previous, 3358 Scope *S) { 3359 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 3360 "Decl is not a locally-scoped decl!"); 3361 // Note that we have a locally-scoped external with this name. 3362 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 3363 3364 if (!Previous.isSingleResult()) 3365 return; 3366 3367 NamedDecl *PrevDecl = Previous.getFoundDecl(); 3368 3369 // If there was a previous declaration of this variable, it may be 3370 // in our identifier chain. Update the identifier chain with the new 3371 // declaration. 3372 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 3373 // The previous declaration was found on the identifer resolver 3374 // chain, so remove it from its scope. 3375 3376 if (S->isDeclScope(PrevDecl)) { 3377 // Special case for redeclarations in the SAME scope. 3378 // Because this declaration is going to be added to the identifier chain 3379 // later, we should temporarily take it OFF the chain. 3380 IdResolver.RemoveDecl(ND); 3381 3382 } else { 3383 // Find the scope for the original declaration. 3384 while (S && !S->isDeclScope(PrevDecl)) 3385 S = S->getParent(); 3386 } 3387 3388 if (S) 3389 S->RemoveDecl(PrevDecl); 3390 } 3391} 3392 3393llvm::DenseMap<DeclarationName, NamedDecl *>::iterator 3394Sema::findLocallyScopedExternalDecl(DeclarationName Name) { 3395 if (ExternalSource) { 3396 // Load locally-scoped external decls from the external source. 3397 SmallVector<NamedDecl *, 4> Decls; 3398 ExternalSource->ReadLocallyScopedExternalDecls(Decls); 3399 for (unsigned I = 0, N = Decls.size(); I != N; ++I) { 3400 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3401 = LocallyScopedExternalDecls.find(Decls[I]->getDeclName()); 3402 if (Pos == LocallyScopedExternalDecls.end()) 3403 LocallyScopedExternalDecls[Decls[I]->getDeclName()] = Decls[I]; 3404 } 3405 } 3406 3407 return LocallyScopedExternalDecls.find(Name); 3408} 3409 3410/// \brief Diagnose function specifiers on a declaration of an identifier that 3411/// does not identify a function. 3412void Sema::DiagnoseFunctionSpecifiers(Declarator& D) { 3413 // FIXME: We should probably indicate the identifier in question to avoid 3414 // confusion for constructs like "inline int a(), b;" 3415 if (D.getDeclSpec().isInlineSpecified()) 3416 Diag(D.getDeclSpec().getInlineSpecLoc(), 3417 diag::err_inline_non_function); 3418 3419 if (D.getDeclSpec().isVirtualSpecified()) 3420 Diag(D.getDeclSpec().getVirtualSpecLoc(), 3421 diag::err_virtual_non_function); 3422 3423 if (D.getDeclSpec().isExplicitSpecified()) 3424 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3425 diag::err_explicit_non_function); 3426} 3427 3428NamedDecl* 3429Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 3430 QualType R, TypeSourceInfo *TInfo, 3431 LookupResult &Previous, bool &Redeclaration) { 3432 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 3433 if (D.getCXXScopeSpec().isSet()) { 3434 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 3435 << D.getCXXScopeSpec().getRange(); 3436 D.setInvalidType(); 3437 // Pretend we didn't see the scope specifier. 3438 DC = CurContext; 3439 Previous.clear(); 3440 } 3441 3442 if (getLangOptions().CPlusPlus) { 3443 // Check that there are no default arguments (C++ only). 3444 CheckExtraCXXDefaultArguments(D); 3445 } 3446 3447 DiagnoseFunctionSpecifiers(D); 3448 3449 if (D.getDeclSpec().isThreadSpecified()) 3450 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 3451 if (D.getDeclSpec().isConstexprSpecified()) 3452 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 3453 << 1; 3454 3455 if (D.getName().Kind != UnqualifiedId::IK_Identifier) { 3456 Diag(D.getName().StartLocation, diag::err_typedef_not_identifier) 3457 << D.getName().getSourceRange(); 3458 return 0; 3459 } 3460 3461 TypedefDecl *NewTD = ParseTypedefDecl(S, D, R, TInfo); 3462 if (!NewTD) return 0; 3463 3464 // Handle attributes prior to checking for duplicates in MergeVarDecl 3465 ProcessDeclAttributes(S, NewTD, D); 3466 3467 CheckTypedefForVariablyModifiedType(S, NewTD); 3468 3469 return ActOnTypedefNameDecl(S, DC, NewTD, Previous, Redeclaration); 3470} 3471 3472void 3473Sema::CheckTypedefForVariablyModifiedType(Scope *S, TypedefNameDecl *NewTD) { 3474 // C99 6.7.7p2: If a typedef name specifies a variably modified type 3475 // then it shall have block scope. 3476 // Note that variably modified types must be fixed before merging the decl so 3477 // that redeclarations will match. 3478 QualType T = NewTD->getUnderlyingType(); 3479 if (T->isVariablyModifiedType()) { 3480 getCurFunction()->setHasBranchProtectedScope(); 3481 3482 if (S->getFnParent() == 0) { 3483 bool SizeIsNegative; 3484 llvm::APSInt Oversized; 3485 QualType FixedTy = 3486 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 3487 Oversized); 3488 if (!FixedTy.isNull()) { 3489 Diag(NewTD->getLocation(), diag::warn_illegal_constant_array_size); 3490 NewTD->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(FixedTy)); 3491 } else { 3492 if (SizeIsNegative) 3493 Diag(NewTD->getLocation(), diag::err_typecheck_negative_array_size); 3494 else if (T->isVariableArrayType()) 3495 Diag(NewTD->getLocation(), diag::err_vla_decl_in_file_scope); 3496 else if (Oversized.getBoolValue()) 3497 Diag(NewTD->getLocation(), diag::err_array_too_large) << Oversized.toString(10); 3498 else 3499 Diag(NewTD->getLocation(), diag::err_vm_decl_in_file_scope); 3500 NewTD->setInvalidDecl(); 3501 } 3502 } 3503 } 3504} 3505 3506 3507/// ActOnTypedefNameDecl - Perform semantic checking for a declaration which 3508/// declares a typedef-name, either using the 'typedef' type specifier or via 3509/// a C++0x [dcl.typedef]p2 alias-declaration: 'using T = A;'. 3510NamedDecl* 3511Sema::ActOnTypedefNameDecl(Scope *S, DeclContext *DC, TypedefNameDecl *NewTD, 3512 LookupResult &Previous, bool &Redeclaration) { 3513 // Merge the decl with the existing one if appropriate. If the decl is 3514 // in an outer scope, it isn't the same thing. 3515 FilterLookupForScope(Previous, DC, S, /*ConsiderLinkage*/ false, 3516 /*ExplicitInstantiationOrSpecialization=*/false); 3517 if (!Previous.empty()) { 3518 Redeclaration = true; 3519 MergeTypedefNameDecl(NewTD, Previous); 3520 } 3521 3522 // If this is the C FILE type, notify the AST context. 3523 if (IdentifierInfo *II = NewTD->getIdentifier()) 3524 if (!NewTD->isInvalidDecl() && 3525 NewTD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 3526 if (II->isStr("FILE")) 3527 Context.setFILEDecl(NewTD); 3528 else if (II->isStr("jmp_buf")) 3529 Context.setjmp_bufDecl(NewTD); 3530 else if (II->isStr("sigjmp_buf")) 3531 Context.setsigjmp_bufDecl(NewTD); 3532 else if (II->isStr("__builtin_va_list")) 3533 Context.setBuiltinVaListType(Context.getTypedefType(NewTD)); 3534 } 3535 3536 return NewTD; 3537} 3538 3539/// \brief Determines whether the given declaration is an out-of-scope 3540/// previous declaration. 3541/// 3542/// This routine should be invoked when name lookup has found a 3543/// previous declaration (PrevDecl) that is not in the scope where a 3544/// new declaration by the same name is being introduced. If the new 3545/// declaration occurs in a local scope, previous declarations with 3546/// linkage may still be considered previous declarations (C99 3547/// 6.2.2p4-5, C++ [basic.link]p6). 3548/// 3549/// \param PrevDecl the previous declaration found by name 3550/// lookup 3551/// 3552/// \param DC the context in which the new declaration is being 3553/// declared. 3554/// 3555/// \returns true if PrevDecl is an out-of-scope previous declaration 3556/// for a new delcaration with the same name. 3557static bool 3558isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 3559 ASTContext &Context) { 3560 if (!PrevDecl) 3561 return false; 3562 3563 if (!PrevDecl->hasLinkage()) 3564 return false; 3565 3566 if (Context.getLangOptions().CPlusPlus) { 3567 // C++ [basic.link]p6: 3568 // If there is a visible declaration of an entity with linkage 3569 // having the same name and type, ignoring entities declared 3570 // outside the innermost enclosing namespace scope, the block 3571 // scope declaration declares that same entity and receives the 3572 // linkage of the previous declaration. 3573 DeclContext *OuterContext = DC->getRedeclContext(); 3574 if (!OuterContext->isFunctionOrMethod()) 3575 // This rule only applies to block-scope declarations. 3576 return false; 3577 3578 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 3579 if (PrevOuterContext->isRecord()) 3580 // We found a member function: ignore it. 3581 return false; 3582 3583 // Find the innermost enclosing namespace for the new and 3584 // previous declarations. 3585 OuterContext = OuterContext->getEnclosingNamespaceContext(); 3586 PrevOuterContext = PrevOuterContext->getEnclosingNamespaceContext(); 3587 3588 // The previous declaration is in a different namespace, so it 3589 // isn't the same function. 3590 if (!OuterContext->Equals(PrevOuterContext)) 3591 return false; 3592 } 3593 3594 return true; 3595} 3596 3597static void SetNestedNameSpecifier(DeclaratorDecl *DD, Declarator &D) { 3598 CXXScopeSpec &SS = D.getCXXScopeSpec(); 3599 if (!SS.isSet()) return; 3600 DD->setQualifierInfo(SS.getWithLocInContext(DD->getASTContext())); 3601} 3602 3603bool Sema::inferObjCARCLifetime(ValueDecl *decl) { 3604 QualType type = decl->getType(); 3605 Qualifiers::ObjCLifetime lifetime = type.getObjCLifetime(); 3606 if (lifetime == Qualifiers::OCL_Autoreleasing) { 3607 // Various kinds of declaration aren't allowed to be __autoreleasing. 3608 unsigned kind = -1U; 3609 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 3610 if (var->hasAttr<BlocksAttr>()) 3611 kind = 0; // __block 3612 else if (!var->hasLocalStorage()) 3613 kind = 1; // global 3614 } else if (isa<ObjCIvarDecl>(decl)) { 3615 kind = 3; // ivar 3616 } else if (isa<FieldDecl>(decl)) { 3617 kind = 2; // field 3618 } 3619 3620 if (kind != -1U) { 3621 Diag(decl->getLocation(), diag::err_arc_autoreleasing_var) 3622 << kind; 3623 } 3624 } else if (lifetime == Qualifiers::OCL_None) { 3625 // Try to infer lifetime. 3626 if (!type->isObjCLifetimeType()) 3627 return false; 3628 3629 lifetime = type->getObjCARCImplicitLifetime(); 3630 type = Context.getLifetimeQualifiedType(type, lifetime); 3631 decl->setType(type); 3632 } 3633 3634 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 3635 // Thread-local variables cannot have lifetime. 3636 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone && 3637 var->isThreadSpecified()) { 3638 Diag(var->getLocation(), diag::err_arc_thread_ownership) 3639 << var->getType(); 3640 return true; 3641 } 3642 } 3643 3644 return false; 3645} 3646 3647NamedDecl* 3648Sema::ActOnVariableDeclarator(Scope *S, Declarator &D, DeclContext *DC, 3649 QualType R, TypeSourceInfo *TInfo, 3650 LookupResult &Previous, 3651 MultiTemplateParamsArg TemplateParamLists, 3652 bool &Redeclaration) { 3653 DeclarationName Name = GetNameForDeclarator(D).getName(); 3654 3655 // Check that there are no default arguments (C++ only). 3656 if (getLangOptions().CPlusPlus) 3657 CheckExtraCXXDefaultArguments(D); 3658 3659 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpec(); 3660 assert(SCSpec != DeclSpec::SCS_typedef && 3661 "Parser allowed 'typedef' as storage class VarDecl."); 3662 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 3663 if (SCSpec == DeclSpec::SCS_mutable) { 3664 // mutable can only appear on non-static class members, so it's always 3665 // an error here 3666 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 3667 D.setInvalidType(); 3668 SC = SC_None; 3669 } 3670 SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 3671 VarDecl::StorageClass SCAsWritten 3672 = StorageClassSpecToVarDeclStorageClass(SCSpec); 3673 3674 IdentifierInfo *II = Name.getAsIdentifierInfo(); 3675 if (!II) { 3676 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 3677 << Name.getAsString(); 3678 return 0; 3679 } 3680 3681 DiagnoseFunctionSpecifiers(D); 3682 3683 if (!DC->isRecord() && S->getFnParent() == 0) { 3684 // C99 6.9p2: The storage-class specifiers auto and register shall not 3685 // appear in the declaration specifiers in an external declaration. 3686 if (SC == SC_Auto || SC == SC_Register) { 3687 3688 // If this is a register variable with an asm label specified, then this 3689 // is a GNU extension. 3690 if (SC == SC_Register && D.getAsmLabel()) 3691 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register); 3692 else 3693 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 3694 D.setInvalidType(); 3695 } 3696 } 3697 3698 bool isExplicitSpecialization = false; 3699 VarDecl *NewVD; 3700 if (!getLangOptions().CPlusPlus) { 3701 NewVD = VarDecl::Create(Context, DC, D.getSourceRange().getBegin(), 3702 D.getIdentifierLoc(), II, 3703 R, TInfo, SC, SCAsWritten); 3704 3705 if (D.isInvalidType()) 3706 NewVD->setInvalidDecl(); 3707 } else { 3708 if (DC->isRecord() && !CurContext->isRecord()) { 3709 // This is an out-of-line definition of a static data member. 3710 if (SC == SC_Static) { 3711 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 3712 diag::err_static_out_of_line) 3713 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3714 } else if (SC == SC_None) 3715 SC = SC_Static; 3716 } 3717 if (SC == SC_Static) { 3718 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) { 3719 if (RD->isLocalClass()) 3720 Diag(D.getIdentifierLoc(), 3721 diag::err_static_data_member_not_allowed_in_local_class) 3722 << Name << RD->getDeclName(); 3723 3724 // C++ [class.union]p1: If a union contains a static data member, 3725 // the program is ill-formed. 3726 // 3727 // We also disallow static data members in anonymous structs. 3728 if (CurContext->isRecord() && (RD->isUnion() || !RD->getDeclName())) 3729 Diag(D.getIdentifierLoc(), 3730 diag::err_static_data_member_not_allowed_in_union_or_anon_struct) 3731 << Name << RD->isUnion(); 3732 } 3733 } 3734 3735 // Match up the template parameter lists with the scope specifier, then 3736 // determine whether we have a template or a template specialization. 3737 isExplicitSpecialization = false; 3738 bool Invalid = false; 3739 if (TemplateParameterList *TemplateParams 3740 = MatchTemplateParametersToScopeSpecifier( 3741 D.getDeclSpec().getSourceRange().getBegin(), 3742 D.getIdentifierLoc(), 3743 D.getCXXScopeSpec(), 3744 TemplateParamLists.get(), 3745 TemplateParamLists.size(), 3746 /*never a friend*/ false, 3747 isExplicitSpecialization, 3748 Invalid)) { 3749 if (TemplateParams->size() > 0) { 3750 // There is no such thing as a variable template. 3751 Diag(D.getIdentifierLoc(), diag::err_template_variable) 3752 << II 3753 << SourceRange(TemplateParams->getTemplateLoc(), 3754 TemplateParams->getRAngleLoc()); 3755 return 0; 3756 } else { 3757 // There is an extraneous 'template<>' for this variable. Complain 3758 // about it, but allow the declaration of the variable. 3759 Diag(TemplateParams->getTemplateLoc(), 3760 diag::err_template_variable_noparams) 3761 << II 3762 << SourceRange(TemplateParams->getTemplateLoc(), 3763 TemplateParams->getRAngleLoc()); 3764 } 3765 } 3766 3767 NewVD = VarDecl::Create(Context, DC, D.getSourceRange().getBegin(), 3768 D.getIdentifierLoc(), II, 3769 R, TInfo, SC, SCAsWritten); 3770 3771 // If this decl has an auto type in need of deduction, make a note of the 3772 // Decl so we can diagnose uses of it in its own initializer. 3773 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto && 3774 R->getContainedAutoType()) 3775 ParsingInitForAutoVars.insert(NewVD); 3776 3777 if (D.isInvalidType() || Invalid) 3778 NewVD->setInvalidDecl(); 3779 3780 SetNestedNameSpecifier(NewVD, D); 3781 3782 if (TemplateParamLists.size() > 0 && D.getCXXScopeSpec().isSet()) { 3783 NewVD->setTemplateParameterListsInfo(Context, 3784 TemplateParamLists.size(), 3785 TemplateParamLists.release()); 3786 } 3787 3788 if (D.getDeclSpec().isConstexprSpecified()) { 3789 // FIXME: check this is a valid use of constexpr. 3790 NewVD->setConstexpr(true); 3791 } 3792 } 3793 3794 if (D.getDeclSpec().isThreadSpecified()) { 3795 if (NewVD->hasLocalStorage()) 3796 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global); 3797 else if (!Context.Target.isTLSSupported()) 3798 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported); 3799 else 3800 NewVD->setThreadSpecified(true); 3801 } 3802 3803 // Set the lexical context. If the declarator has a C++ scope specifier, the 3804 // lexical context will be different from the semantic context. 3805 NewVD->setLexicalDeclContext(CurContext); 3806 3807 // Handle attributes prior to checking for duplicates in MergeVarDecl 3808 ProcessDeclAttributes(S, NewVD, D); 3809 3810 // In auto-retain/release, infer strong retension for variables of 3811 // retainable type. 3812 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewVD)) 3813 NewVD->setInvalidDecl(); 3814 3815 // Handle GNU asm-label extension (encoded as an attribute). 3816 if (Expr *E = (Expr*)D.getAsmLabel()) { 3817 // The parser guarantees this is a string. 3818 StringLiteral *SE = cast<StringLiteral>(E); 3819 StringRef Label = SE->getString(); 3820 if (S->getFnParent() != 0) { 3821 switch (SC) { 3822 case SC_None: 3823 case SC_Auto: 3824 Diag(E->getExprLoc(), diag::warn_asm_label_on_auto_decl) << Label; 3825 break; 3826 case SC_Register: 3827 if (!Context.Target.isValidGCCRegisterName(Label)) 3828 Diag(E->getExprLoc(), diag::err_asm_unknown_register_name) << Label; 3829 break; 3830 case SC_Static: 3831 case SC_Extern: 3832 case SC_PrivateExtern: 3833 break; 3834 } 3835 } 3836 3837 NewVD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), 3838 Context, Label)); 3839 } 3840 3841 // Diagnose shadowed variables before filtering for scope. 3842 if (!D.getCXXScopeSpec().isSet()) 3843 CheckShadow(S, NewVD, Previous); 3844 3845 // Don't consider existing declarations that are in a different 3846 // scope and are out-of-semantic-context declarations (if the new 3847 // declaration has linkage). 3848 FilterLookupForScope(Previous, DC, S, NewVD->hasLinkage(), 3849 isExplicitSpecialization); 3850 3851 if (!getLangOptions().CPlusPlus) 3852 CheckVariableDeclaration(NewVD, Previous, Redeclaration); 3853 else { 3854 // Merge the decl with the existing one if appropriate. 3855 if (!Previous.empty()) { 3856 if (Previous.isSingleResult() && 3857 isa<FieldDecl>(Previous.getFoundDecl()) && 3858 D.getCXXScopeSpec().isSet()) { 3859 // The user tried to define a non-static data member 3860 // out-of-line (C++ [dcl.meaning]p1). 3861 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 3862 << D.getCXXScopeSpec().getRange(); 3863 Previous.clear(); 3864 NewVD->setInvalidDecl(); 3865 } 3866 } else if (D.getCXXScopeSpec().isSet()) { 3867 // No previous declaration in the qualifying scope. 3868 Diag(D.getIdentifierLoc(), diag::err_no_member) 3869 << Name << computeDeclContext(D.getCXXScopeSpec(), true) 3870 << D.getCXXScopeSpec().getRange(); 3871 NewVD->setInvalidDecl(); 3872 } 3873 3874 CheckVariableDeclaration(NewVD, Previous, Redeclaration); 3875 3876 // This is an explicit specialization of a static data member. Check it. 3877 if (isExplicitSpecialization && !NewVD->isInvalidDecl() && 3878 CheckMemberSpecialization(NewVD, Previous)) 3879 NewVD->setInvalidDecl(); 3880 } 3881 3882 // attributes declared post-definition are currently ignored 3883 // FIXME: This should be handled in attribute merging, not 3884 // here. 3885 if (Previous.isSingleResult()) { 3886 VarDecl *Def = dyn_cast<VarDecl>(Previous.getFoundDecl()); 3887 if (Def && (Def = Def->getDefinition()) && 3888 Def != NewVD && D.hasAttributes()) { 3889 Diag(NewVD->getLocation(), diag::warn_attribute_precede_definition); 3890 Diag(Def->getLocation(), diag::note_previous_definition); 3891 } 3892 } 3893 3894 // If this is a locally-scoped extern C variable, update the map of 3895 // such variables. 3896 if (CurContext->isFunctionOrMethod() && NewVD->isExternC() && 3897 !NewVD->isInvalidDecl()) 3898 RegisterLocallyScopedExternCDecl(NewVD, Previous, S); 3899 3900 // If there's a #pragma GCC visibility in scope, and this isn't a class 3901 // member, set the visibility of this variable. 3902 if (NewVD->getLinkage() == ExternalLinkage && !DC->isRecord()) 3903 AddPushedVisibilityAttribute(NewVD); 3904 3905 MarkUnusedFileScopedDecl(NewVD); 3906 3907 return NewVD; 3908} 3909 3910/// \brief Diagnose variable or built-in function shadowing. Implements 3911/// -Wshadow. 3912/// 3913/// This method is called whenever a VarDecl is added to a "useful" 3914/// scope. 3915/// 3916/// \param S the scope in which the shadowing name is being declared 3917/// \param R the lookup of the name 3918/// 3919void Sema::CheckShadow(Scope *S, VarDecl *D, const LookupResult& R) { 3920 // Return if warning is ignored. 3921 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, R.getNameLoc()) == 3922 Diagnostic::Ignored) 3923 return; 3924 3925 // Don't diagnose declarations at file scope. 3926 if (D->hasGlobalStorage()) 3927 return; 3928 3929 DeclContext *NewDC = D->getDeclContext(); 3930 3931 // Only diagnose if we're shadowing an unambiguous field or variable. 3932 if (R.getResultKind() != LookupResult::Found) 3933 return; 3934 3935 NamedDecl* ShadowedDecl = R.getFoundDecl(); 3936 if (!isa<VarDecl>(ShadowedDecl) && !isa<FieldDecl>(ShadowedDecl)) 3937 return; 3938 3939 // Fields are not shadowed by variables in C++ static methods. 3940 if (isa<FieldDecl>(ShadowedDecl)) 3941 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewDC)) 3942 if (MD->isStatic()) 3943 return; 3944 3945 if (VarDecl *shadowedVar = dyn_cast<VarDecl>(ShadowedDecl)) 3946 if (shadowedVar->isExternC()) { 3947 // For shadowing external vars, make sure that we point to the global 3948 // declaration, not a locally scoped extern declaration. 3949 for (VarDecl::redecl_iterator 3950 I = shadowedVar->redecls_begin(), E = shadowedVar->redecls_end(); 3951 I != E; ++I) 3952 if (I->isFileVarDecl()) { 3953 ShadowedDecl = *I; 3954 break; 3955 } 3956 } 3957 3958 DeclContext *OldDC = ShadowedDecl->getDeclContext(); 3959 3960 // Only warn about certain kinds of shadowing for class members. 3961 if (NewDC && NewDC->isRecord()) { 3962 // In particular, don't warn about shadowing non-class members. 3963 if (!OldDC->isRecord()) 3964 return; 3965 3966 // TODO: should we warn about static data members shadowing 3967 // static data members from base classes? 3968 3969 // TODO: don't diagnose for inaccessible shadowed members. 3970 // This is hard to do perfectly because we might friend the 3971 // shadowing context, but that's just a false negative. 3972 } 3973 3974 // Determine what kind of declaration we're shadowing. 3975 unsigned Kind; 3976 if (isa<RecordDecl>(OldDC)) { 3977 if (isa<FieldDecl>(ShadowedDecl)) 3978 Kind = 3; // field 3979 else 3980 Kind = 2; // static data member 3981 } else if (OldDC->isFileContext()) 3982 Kind = 1; // global 3983 else 3984 Kind = 0; // local 3985 3986 DeclarationName Name = R.getLookupName(); 3987 3988 // Emit warning and note. 3989 Diag(R.getNameLoc(), diag::warn_decl_shadow) << Name << Kind << OldDC; 3990 Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration); 3991} 3992 3993/// \brief Check -Wshadow without the advantage of a previous lookup. 3994void Sema::CheckShadow(Scope *S, VarDecl *D) { 3995 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, D->getLocation()) == 3996 Diagnostic::Ignored) 3997 return; 3998 3999 LookupResult R(*this, D->getDeclName(), D->getLocation(), 4000 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4001 LookupName(R, S); 4002 CheckShadow(S, D, R); 4003} 4004 4005/// \brief Perform semantic checking on a newly-created variable 4006/// declaration. 4007/// 4008/// This routine performs all of the type-checking required for a 4009/// variable declaration once it has been built. It is used both to 4010/// check variables after they have been parsed and their declarators 4011/// have been translated into a declaration, and to check variables 4012/// that have been instantiated from a template. 4013/// 4014/// Sets NewVD->isInvalidDecl() if an error was encountered. 4015void Sema::CheckVariableDeclaration(VarDecl *NewVD, 4016 LookupResult &Previous, 4017 bool &Redeclaration) { 4018 // If the decl is already known invalid, don't check it. 4019 if (NewVD->isInvalidDecl()) 4020 return; 4021 4022 QualType T = NewVD->getType(); 4023 4024 if (T->isObjCObjectType()) { 4025 Diag(NewVD->getLocation(), diag::err_statically_allocated_object) 4026 << FixItHint::CreateInsertion(NewVD->getLocation(), "*"); 4027 T = Context.getObjCObjectPointerType(T); 4028 NewVD->setType(T); 4029 } 4030 4031 // Emit an error if an address space was applied to decl with local storage. 4032 // This includes arrays of objects with address space qualifiers, but not 4033 // automatic variables that point to other address spaces. 4034 // ISO/IEC TR 18037 S5.1.2 4035 if (NewVD->hasLocalStorage() && T.getAddressSpace() != 0) { 4036 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 4037 return NewVD->setInvalidDecl(); 4038 } 4039 4040 if (NewVD->hasLocalStorage() && T.isObjCGCWeak() 4041 && !NewVD->hasAttr<BlocksAttr>()) { 4042 if (getLangOptions().getGCMode() != LangOptions::NonGC) 4043 Diag(NewVD->getLocation(), diag::warn_gc_attribute_weak_on_local); 4044 else 4045 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 4046 } 4047 4048 bool isVM = T->isVariablyModifiedType(); 4049 if (isVM || NewVD->hasAttr<CleanupAttr>() || 4050 NewVD->hasAttr<BlocksAttr>()) 4051 getCurFunction()->setHasBranchProtectedScope(); 4052 4053 if ((isVM && NewVD->hasLinkage()) || 4054 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { 4055 bool SizeIsNegative; 4056 llvm::APSInt Oversized; 4057 QualType FixedTy = 4058 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 4059 Oversized); 4060 4061 if (FixedTy.isNull() && T->isVariableArrayType()) { 4062 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 4063 // FIXME: This won't give the correct result for 4064 // int a[10][n]; 4065 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 4066 4067 if (NewVD->isFileVarDecl()) 4068 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 4069 << SizeRange; 4070 else if (NewVD->getStorageClass() == SC_Static) 4071 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 4072 << SizeRange; 4073 else 4074 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 4075 << SizeRange; 4076 return NewVD->setInvalidDecl(); 4077 } 4078 4079 if (FixedTy.isNull()) { 4080 if (NewVD->isFileVarDecl()) 4081 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 4082 else 4083 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 4084 return NewVD->setInvalidDecl(); 4085 } 4086 4087 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 4088 NewVD->setType(FixedTy); 4089 } 4090 4091 if (Previous.empty() && NewVD->isExternC()) { 4092 // Since we did not find anything by this name and we're declaring 4093 // an extern "C" variable, look for a non-visible extern "C" 4094 // declaration with the same name. 4095 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 4096 = findLocallyScopedExternalDecl(NewVD->getDeclName()); 4097 if (Pos != LocallyScopedExternalDecls.end()) 4098 Previous.addDecl(Pos->second); 4099 } 4100 4101 if (T->isVoidType() && !NewVD->hasExternalStorage()) { 4102 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 4103 << T; 4104 return NewVD->setInvalidDecl(); 4105 } 4106 4107 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { 4108 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); 4109 return NewVD->setInvalidDecl(); 4110 } 4111 4112 if (isVM && NewVD->hasAttr<BlocksAttr>()) { 4113 Diag(NewVD->getLocation(), diag::err_block_on_vm); 4114 return NewVD->setInvalidDecl(); 4115 } 4116 4117 // Function pointers and references cannot have qualified function type, only 4118 // function pointer-to-members can do that. 4119 QualType Pointee; 4120 unsigned PtrOrRef = 0; 4121 if (const PointerType *Ptr = T->getAs<PointerType>()) 4122 Pointee = Ptr->getPointeeType(); 4123 else if (const ReferenceType *Ref = T->getAs<ReferenceType>()) { 4124 Pointee = Ref->getPointeeType(); 4125 PtrOrRef = 1; 4126 } 4127 if (!Pointee.isNull() && Pointee->isFunctionProtoType() && 4128 Pointee->getAs<FunctionProtoType>()->getTypeQuals() != 0) { 4129 Diag(NewVD->getLocation(), diag::err_invalid_qualified_function_pointer) 4130 << PtrOrRef; 4131 return NewVD->setInvalidDecl(); 4132 } 4133 4134 if (!Previous.empty()) { 4135 Redeclaration = true; 4136 MergeVarDecl(NewVD, Previous); 4137 } 4138} 4139 4140/// \brief Data used with FindOverriddenMethod 4141struct FindOverriddenMethodData { 4142 Sema *S; 4143 CXXMethodDecl *Method; 4144}; 4145 4146/// \brief Member lookup function that determines whether a given C++ 4147/// method overrides a method in a base class, to be used with 4148/// CXXRecordDecl::lookupInBases(). 4149static bool FindOverriddenMethod(const CXXBaseSpecifier *Specifier, 4150 CXXBasePath &Path, 4151 void *UserData) { 4152 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4153 4154 FindOverriddenMethodData *Data 4155 = reinterpret_cast<FindOverriddenMethodData*>(UserData); 4156 4157 DeclarationName Name = Data->Method->getDeclName(); 4158 4159 // FIXME: Do we care about other names here too? 4160 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4161 // We really want to find the base class destructor here. 4162 QualType T = Data->S->Context.getTypeDeclType(BaseRecord); 4163 CanQualType CT = Data->S->Context.getCanonicalType(T); 4164 4165 Name = Data->S->Context.DeclarationNames.getCXXDestructorName(CT); 4166 } 4167 4168 for (Path.Decls = BaseRecord->lookup(Name); 4169 Path.Decls.first != Path.Decls.second; 4170 ++Path.Decls.first) { 4171 NamedDecl *D = *Path.Decls.first; 4172 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4173 if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD, false)) 4174 return true; 4175 } 4176 } 4177 4178 return false; 4179} 4180 4181/// AddOverriddenMethods - See if a method overrides any in the base classes, 4182/// and if so, check that it's a valid override and remember it. 4183bool Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4184 // Look for virtual methods in base classes that this method might override. 4185 CXXBasePaths Paths; 4186 FindOverriddenMethodData Data; 4187 Data.Method = MD; 4188 Data.S = this; 4189 bool AddedAny = false; 4190 if (DC->lookupInBases(&FindOverriddenMethod, &Data, Paths)) { 4191 for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(), 4192 E = Paths.found_decls_end(); I != E; ++I) { 4193 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) { 4194 MD->addOverriddenMethod(OldMD->getCanonicalDecl()); 4195 if (!CheckOverridingFunctionReturnType(MD, OldMD) && 4196 !CheckOverridingFunctionExceptionSpec(MD, OldMD) && 4197 !CheckIfOverriddenFunctionIsMarkedFinal(MD, OldMD)) { 4198 AddedAny = true; 4199 } 4200 } 4201 } 4202 } 4203 4204 return AddedAny; 4205} 4206 4207static void DiagnoseInvalidRedeclaration(Sema &S, FunctionDecl *NewFD, 4208 bool isFriendDecl) { 4209 DeclarationName Name = NewFD->getDeclName(); 4210 DeclContext *DC = NewFD->getDeclContext(); 4211 LookupResult Prev(S, Name, NewFD->getLocation(), 4212 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4213 llvm::SmallVector<unsigned, 1> MismatchedParams; 4214 llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1> NearMatches; 4215 TypoCorrection Correction; 4216 unsigned DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend 4217 : diag::err_member_def_does_not_match; 4218 4219 NewFD->setInvalidDecl(); 4220 S.LookupQualifiedName(Prev, DC); 4221 assert(!Prev.isAmbiguous() && 4222 "Cannot have an ambiguity in previous-declaration lookup"); 4223 if (!Prev.empty()) { 4224 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 4225 Func != FuncEnd; ++Func) { 4226 FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func); 4227 if (FD && isNearlyMatchingFunction(S.Context, FD, NewFD, 4228 MismatchedParams)) { 4229 // Add 1 to the index so that 0 can mean the mismatch didn't 4230 // involve a parameter 4231 unsigned ParamNum = 4232 MismatchedParams.empty() ? 0 : MismatchedParams.front() + 1; 4233 NearMatches.push_back(std::make_pair(FD, ParamNum)); 4234 } 4235 } 4236 // If the qualified name lookup yielded nothing, try typo correction 4237 } else if ((Correction = S.CorrectTypo(Prev.getLookupNameInfo(), 4238 Prev.getLookupKind(), 0, 0, DC))) { 4239 DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend_suggest 4240 : diag::err_member_def_does_not_match_suggest; 4241 for (TypoCorrection::decl_iterator CDecl = Correction.begin(), 4242 CDeclEnd = Correction.end(); 4243 CDecl != CDeclEnd; ++CDecl) { 4244 FunctionDecl *FD = dyn_cast<FunctionDecl>(*CDecl); 4245 if (FD && isNearlyMatchingFunction(S.Context, FD, NewFD, 4246 MismatchedParams)) { 4247 // Add 1 to the index so that 0 can mean the mismatch didn't 4248 // involve a parameter 4249 unsigned ParamNum = 4250 MismatchedParams.empty() ? 0 : MismatchedParams.front() + 1; 4251 NearMatches.push_back(std::make_pair(FD, ParamNum)); 4252 } 4253 } 4254 } 4255 4256 if (Correction) 4257 S.Diag(NewFD->getLocation(), DiagMsg) 4258 << Name << DC << Correction.getQuoted(S.getLangOptions()) 4259 << FixItHint::CreateReplacement( 4260 NewFD->getLocation(), Correction.getAsString(S.getLangOptions())); 4261 else 4262 S.Diag(NewFD->getLocation(), DiagMsg) << Name << DC << NewFD->getLocation(); 4263 4264 for (llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1>::iterator 4265 NearMatch = NearMatches.begin(), NearMatchEnd = NearMatches.end(); 4266 NearMatch != NearMatchEnd; ++NearMatch) { 4267 FunctionDecl *FD = NearMatch->first; 4268 4269 if (unsigned Idx = NearMatch->second) { 4270 ParmVarDecl *FDParam = FD->getParamDecl(Idx-1); 4271 S.Diag(FDParam->getTypeSpecStartLoc(), 4272 diag::note_member_def_close_param_match) 4273 << Idx << FDParam->getType() << NewFD->getParamDecl(Idx-1)->getType(); 4274 } else if (Correction) { 4275 S.Diag(FD->getLocation(), diag::note_previous_decl) 4276 << Correction.getQuoted(S.getLangOptions()); 4277 } else 4278 S.Diag(FD->getLocation(), diag::note_member_def_close_match); 4279 } 4280} 4281 4282NamedDecl* 4283Sema::ActOnFunctionDeclarator(Scope *S, Declarator &D, DeclContext *DC, 4284 QualType R, TypeSourceInfo *TInfo, 4285 LookupResult &Previous, 4286 MultiTemplateParamsArg TemplateParamLists, 4287 bool IsFunctionDefinition, bool &Redeclaration, 4288 bool &AddToScope) { 4289 assert(R.getTypePtr()->isFunctionType()); 4290 4291 // TODO: consider using NameInfo for diagnostic. 4292 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 4293 DeclarationName Name = NameInfo.getName(); 4294 FunctionDecl::StorageClass SC = SC_None; 4295 switch (D.getDeclSpec().getStorageClassSpec()) { 4296 default: assert(0 && "Unknown storage class!"); 4297 case DeclSpec::SCS_auto: 4298 case DeclSpec::SCS_register: 4299 case DeclSpec::SCS_mutable: 4300 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4301 diag::err_typecheck_sclass_func); 4302 D.setInvalidType(); 4303 break; 4304 case DeclSpec::SCS_unspecified: SC = SC_None; break; 4305 case DeclSpec::SCS_extern: SC = SC_Extern; break; 4306 case DeclSpec::SCS_static: { 4307 if (CurContext->getRedeclContext()->isFunctionOrMethod()) { 4308 // C99 6.7.1p5: 4309 // The declaration of an identifier for a function that has 4310 // block scope shall have no explicit storage-class specifier 4311 // other than extern 4312 // See also (C++ [dcl.stc]p4). 4313 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4314 diag::err_static_block_func); 4315 SC = SC_None; 4316 } else 4317 SC = SC_Static; 4318 break; 4319 } 4320 case DeclSpec::SCS_private_extern: SC = SC_PrivateExtern; break; 4321 } 4322 4323 if (D.getDeclSpec().isThreadSpecified()) 4324 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 4325 4326 // Do not allow returning a objc interface by-value. 4327 if (R->getAs<FunctionType>()->getResultType()->isObjCObjectType()) { 4328 Diag(D.getIdentifierLoc(), 4329 diag::err_object_cannot_be_passed_returned_by_value) << 0 4330 << R->getAs<FunctionType>()->getResultType() 4331 << FixItHint::CreateInsertion(D.getIdentifierLoc(), "*"); 4332 4333 QualType T = R->getAs<FunctionType>()->getResultType(); 4334 T = Context.getObjCObjectPointerType(T); 4335 if (const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(R)) { 4336 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 4337 R = Context.getFunctionType(T, FPT->arg_type_begin(), 4338 FPT->getNumArgs(), EPI); 4339 } 4340 else if (isa<FunctionNoProtoType>(R)) 4341 R = Context.getFunctionNoProtoType(T); 4342 } 4343 4344 FunctionDecl *NewFD; 4345 bool isInline = D.getDeclSpec().isInlineSpecified(); 4346 bool isFriend = false; 4347 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 4348 FunctionDecl::StorageClass SCAsWritten 4349 = StorageClassSpecToFunctionDeclStorageClass(SCSpec); 4350 FunctionTemplateDecl *FunctionTemplate = 0; 4351 bool isExplicitSpecialization = false; 4352 bool isFunctionTemplateSpecialization = false; 4353 bool isDependentClassScopeExplicitSpecialization = false; 4354 4355 if (!getLangOptions().CPlusPlus) { 4356 // Determine whether the function was written with a 4357 // prototype. This true when: 4358 // - there is a prototype in the declarator, or 4359 // - the type R of the function is some kind of typedef or other reference 4360 // to a type name (which eventually refers to a function type). 4361 bool HasPrototype = 4362 (D.isFunctionDeclarator() && D.getFunctionTypeInfo().hasPrototype) || 4363 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 4364 4365 NewFD = FunctionDecl::Create(Context, DC, D.getSourceRange().getBegin(), 4366 NameInfo, R, TInfo, SC, SCAsWritten, isInline, 4367 HasPrototype); 4368 if (D.isInvalidType()) 4369 NewFD->setInvalidDecl(); 4370 4371 // Set the lexical context. 4372 NewFD->setLexicalDeclContext(CurContext); 4373 // Filter out previous declarations that don't match the scope. 4374 FilterLookupForScope(Previous, DC, S, NewFD->hasLinkage(), 4375 /*ExplicitInstantiationOrSpecialization=*/false); 4376 } else { 4377 isFriend = D.getDeclSpec().isFriendSpecified(); 4378 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 4379 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 4380 bool isConstexpr = D.getDeclSpec().isConstexprSpecified(); 4381 bool isVirtualOkay = false; 4382 4383 // Check that the return type is not an abstract class type. 4384 // For record types, this is done by the AbstractClassUsageDiagnoser once 4385 // the class has been completely parsed. 4386 if (!DC->isRecord() && 4387 RequireNonAbstractType(D.getIdentifierLoc(), 4388 R->getAs<FunctionType>()->getResultType(), 4389 diag::err_abstract_type_in_decl, 4390 AbstractReturnType)) 4391 D.setInvalidType(); 4392 4393 if (Name.getNameKind() == DeclarationName::CXXConstructorName) { 4394 // This is a C++ constructor declaration. 4395 assert(DC->isRecord() && 4396 "Constructors can only be declared in a member context"); 4397 4398 R = CheckConstructorDeclarator(D, R, SC); 4399 4400 // Create the new declaration 4401 CXXConstructorDecl *NewCD = CXXConstructorDecl::Create( 4402 Context, 4403 cast<CXXRecordDecl>(DC), 4404 D.getSourceRange().getBegin(), 4405 NameInfo, R, TInfo, 4406 isExplicit, isInline, 4407 /*isImplicitlyDeclared=*/false, 4408 isConstexpr); 4409 4410 NewFD = NewCD; 4411 } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4412 // This is a C++ destructor declaration. 4413 if (DC->isRecord()) { 4414 R = CheckDestructorDeclarator(D, R, SC); 4415 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 4416 4417 CXXDestructorDecl *NewDD = CXXDestructorDecl::Create(Context, Record, 4418 D.getSourceRange().getBegin(), 4419 NameInfo, R, TInfo, 4420 isInline, 4421 /*isImplicitlyDeclared=*/false); 4422 NewFD = NewDD; 4423 isVirtualOkay = true; 4424 4425 // If the class is complete, then we now create the implicit exception 4426 // specification. If the class is incomplete or dependent, we can't do 4427 // it yet. 4428 if (getLangOptions().CPlusPlus0x && !Record->isDependentType() && 4429 Record->getDefinition() && !Record->isBeingDefined() && 4430 R->getAs<FunctionProtoType>()->getExceptionSpecType() == EST_None) { 4431 AdjustDestructorExceptionSpec(Record, NewDD); 4432 } 4433 4434 } else { 4435 Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 4436 4437 // Create a FunctionDecl to satisfy the function definition parsing 4438 // code path. 4439 NewFD = FunctionDecl::Create(Context, DC, D.getSourceRange().getBegin(), 4440 D.getIdentifierLoc(), Name, R, TInfo, 4441 SC, SCAsWritten, isInline, 4442 /*hasPrototype=*/true, isConstexpr); 4443 D.setInvalidType(); 4444 } 4445 } else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) { 4446 if (!DC->isRecord()) { 4447 Diag(D.getIdentifierLoc(), 4448 diag::err_conv_function_not_member); 4449 return 0; 4450 } 4451 4452 CheckConversionDeclarator(D, R, SC); 4453 NewFD = CXXConversionDecl::Create(Context, cast<CXXRecordDecl>(DC), 4454 D.getSourceRange().getBegin(), 4455 NameInfo, R, TInfo, 4456 isInline, isExplicit, isConstexpr, 4457 SourceLocation()); 4458 4459 isVirtualOkay = true; 4460 } else if (DC->isRecord()) { 4461 // If the name of the function is the same as the name of the record, 4462 // then this must be an invalid constructor that has a return type. 4463 // (The parser checks for a return type and makes the declarator a 4464 // constructor if it has no return type). 4465 if (Name.getAsIdentifierInfo() && 4466 Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ 4467 Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 4468 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 4469 << SourceRange(D.getIdentifierLoc()); 4470 return 0; 4471 } 4472 4473 bool isStatic = SC == SC_Static; 4474 4475 // [class.free]p1: 4476 // Any allocation function for a class T is a static member 4477 // (even if not explicitly declared static). 4478 if (Name.getCXXOverloadedOperator() == OO_New || 4479 Name.getCXXOverloadedOperator() == OO_Array_New) 4480 isStatic = true; 4481 4482 // [class.free]p6 Any deallocation function for a class X is a static member 4483 // (even if not explicitly declared static). 4484 if (Name.getCXXOverloadedOperator() == OO_Delete || 4485 Name.getCXXOverloadedOperator() == OO_Array_Delete) 4486 isStatic = true; 4487 4488 // This is a C++ method declaration. 4489 CXXMethodDecl *NewMD = CXXMethodDecl::Create( 4490 Context, cast<CXXRecordDecl>(DC), 4491 D.getSourceRange().getBegin(), 4492 NameInfo, R, TInfo, 4493 isStatic, SCAsWritten, isInline, 4494 isConstexpr, 4495 SourceLocation()); 4496 NewFD = NewMD; 4497 4498 isVirtualOkay = !isStatic; 4499 } else { 4500 // Determine whether the function was written with a 4501 // prototype. This true when: 4502 // - we're in C++ (where every function has a prototype), 4503 NewFD = FunctionDecl::Create(Context, DC, D.getSourceRange().getBegin(), 4504 NameInfo, R, TInfo, SC, SCAsWritten, isInline, 4505 true/*HasPrototype*/, isConstexpr); 4506 } 4507 4508 if (isFriend && !isInline && IsFunctionDefinition) { 4509 // C++ [class.friend]p5 4510 // A function can be defined in a friend declaration of a 4511 // class . . . . Such a function is implicitly inline. 4512 NewFD->setImplicitlyInline(); 4513 } 4514 4515 SetNestedNameSpecifier(NewFD, D); 4516 isExplicitSpecialization = false; 4517 isFunctionTemplateSpecialization = false; 4518 if (D.isInvalidType()) 4519 NewFD->setInvalidDecl(); 4520 4521 // Set the lexical context. If the declarator has a C++ 4522 // scope specifier, or is the object of a friend declaration, the 4523 // lexical context will be different from the semantic context. 4524 NewFD->setLexicalDeclContext(CurContext); 4525 4526 // Match up the template parameter lists with the scope specifier, then 4527 // determine whether we have a template or a template specialization. 4528 bool Invalid = false; 4529 if (TemplateParameterList *TemplateParams 4530 = MatchTemplateParametersToScopeSpecifier( 4531 D.getDeclSpec().getSourceRange().getBegin(), 4532 D.getIdentifierLoc(), 4533 D.getCXXScopeSpec(), 4534 TemplateParamLists.get(), 4535 TemplateParamLists.size(), 4536 isFriend, 4537 isExplicitSpecialization, 4538 Invalid)) { 4539 if (TemplateParams->size() > 0) { 4540 // This is a function template 4541 4542 // Check that we can declare a template here. 4543 if (CheckTemplateDeclScope(S, TemplateParams)) 4544 return 0; 4545 4546 // A destructor cannot be a template. 4547 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4548 Diag(NewFD->getLocation(), diag::err_destructor_template); 4549 return 0; 4550 } 4551 4552 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC, 4553 NewFD->getLocation(), 4554 Name, TemplateParams, 4555 NewFD); 4556 FunctionTemplate->setLexicalDeclContext(CurContext); 4557 NewFD->setDescribedFunctionTemplate(FunctionTemplate); 4558 4559 // For source fidelity, store the other template param lists. 4560 if (TemplateParamLists.size() > 1) { 4561 NewFD->setTemplateParameterListsInfo(Context, 4562 TemplateParamLists.size() - 1, 4563 TemplateParamLists.release()); 4564 } 4565 } else { 4566 // This is a function template specialization. 4567 isFunctionTemplateSpecialization = true; 4568 // For source fidelity, store all the template param lists. 4569 NewFD->setTemplateParameterListsInfo(Context, 4570 TemplateParamLists.size(), 4571 TemplateParamLists.release()); 4572 4573 // C++0x [temp.expl.spec]p20 forbids "template<> friend void foo(int);". 4574 if (isFriend) { 4575 // We want to remove the "template<>", found here. 4576 SourceRange RemoveRange = TemplateParams->getSourceRange(); 4577 4578 // If we remove the template<> and the name is not a 4579 // template-id, we're actually silently creating a problem: 4580 // the friend declaration will refer to an untemplated decl, 4581 // and clearly the user wants a template specialization. So 4582 // we need to insert '<>' after the name. 4583 SourceLocation InsertLoc; 4584 if (D.getName().getKind() != UnqualifiedId::IK_TemplateId) { 4585 InsertLoc = D.getName().getSourceRange().getEnd(); 4586 InsertLoc = PP.getLocForEndOfToken(InsertLoc); 4587 } 4588 4589 Diag(D.getIdentifierLoc(), diag::err_template_spec_decl_friend) 4590 << Name << RemoveRange 4591 << FixItHint::CreateRemoval(RemoveRange) 4592 << FixItHint::CreateInsertion(InsertLoc, "<>"); 4593 } 4594 } 4595 } 4596 else { 4597 // All template param lists were matched against the scope specifier: 4598 // this is NOT (an explicit specialization of) a template. 4599 if (TemplateParamLists.size() > 0) 4600 // For source fidelity, store all the template param lists. 4601 NewFD->setTemplateParameterListsInfo(Context, 4602 TemplateParamLists.size(), 4603 TemplateParamLists.release()); 4604 } 4605 4606 if (Invalid) { 4607 NewFD->setInvalidDecl(); 4608 if (FunctionTemplate) 4609 FunctionTemplate->setInvalidDecl(); 4610 } 4611 4612 // C++ [dcl.fct.spec]p5: 4613 // The virtual specifier shall only be used in declarations of 4614 // nonstatic class member functions that appear within a 4615 // member-specification of a class declaration; see 10.3. 4616 // 4617 if (isVirtual && !NewFD->isInvalidDecl()) { 4618 if (!isVirtualOkay) { 4619 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4620 diag::err_virtual_non_function); 4621 } else if (!CurContext->isRecord()) { 4622 // 'virtual' was specified outside of the class. 4623 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4624 diag::err_virtual_out_of_class) 4625 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 4626 } else if (NewFD->getDescribedFunctionTemplate()) { 4627 // C++ [temp.mem]p3: 4628 // A member function template shall not be virtual. 4629 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4630 diag::err_virtual_member_function_template) 4631 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 4632 } else { 4633 // Okay: Add virtual to the method. 4634 NewFD->setVirtualAsWritten(true); 4635 } 4636 } 4637 4638 // C++ [dcl.fct.spec]p3: 4639 // The inline specifier shall not appear on a block scope function declaration. 4640 if (isInline && !NewFD->isInvalidDecl()) { 4641 if (CurContext->isFunctionOrMethod()) { 4642 // 'inline' is not allowed on block scope function declaration. 4643 Diag(D.getDeclSpec().getInlineSpecLoc(), 4644 diag::err_inline_declaration_block_scope) << Name 4645 << FixItHint::CreateRemoval(D.getDeclSpec().getInlineSpecLoc()); 4646 } 4647 } 4648 4649 // C++ [dcl.fct.spec]p6: 4650 // The explicit specifier shall be used only in the declaration of a 4651 // constructor or conversion function within its class definition; see 12.3.1 4652 // and 12.3.2. 4653 if (isExplicit && !NewFD->isInvalidDecl()) { 4654 if (!CurContext->isRecord()) { 4655 // 'explicit' was specified outside of the class. 4656 Diag(D.getDeclSpec().getExplicitSpecLoc(), 4657 diag::err_explicit_out_of_class) 4658 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 4659 } else if (!isa<CXXConstructorDecl>(NewFD) && 4660 !isa<CXXConversionDecl>(NewFD)) { 4661 // 'explicit' was specified on a function that wasn't a constructor 4662 // or conversion function. 4663 Diag(D.getDeclSpec().getExplicitSpecLoc(), 4664 diag::err_explicit_non_ctor_or_conv_function) 4665 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 4666 } 4667 } 4668 4669 if (isConstexpr) { 4670 // C++0x [dcl.constexpr]p2: constexpr functions and constexpr constructors 4671 // are implicitly inline. 4672 NewFD->setImplicitlyInline(); 4673 4674 // FIXME: If this is a redeclaration, check the original declaration was 4675 // marked constepr. 4676 4677 // C++0x [dcl.constexpr]p3: functions declared constexpr are required to 4678 // be either constructors or to return a literal type. Therefore, 4679 // destructors cannot be declared constexpr. 4680 if (isa<CXXDestructorDecl>(NewFD)) 4681 Diag(D.getDeclSpec().getConstexprSpecLoc(), 4682 diag::err_constexpr_dtor); 4683 } 4684 4685 4686 // Filter out previous declarations that don't match the scope. 4687 FilterLookupForScope(Previous, DC, S, NewFD->hasLinkage(), 4688 isExplicitSpecialization || 4689 isFunctionTemplateSpecialization); 4690 4691 if (isFriend) { 4692 // For now, claim that the objects have no previous declaration. 4693 if (FunctionTemplate) { 4694 FunctionTemplate->setObjectOfFriendDecl(false); 4695 FunctionTemplate->setAccess(AS_public); 4696 } 4697 NewFD->setObjectOfFriendDecl(false); 4698 NewFD->setAccess(AS_public); 4699 } 4700 4701 if (isa<CXXMethodDecl>(NewFD) && DC == CurContext && IsFunctionDefinition) { 4702 // A method is implicitly inline if it's defined in its class 4703 // definition. 4704 NewFD->setImplicitlyInline(); 4705 } 4706 4707 if (SC == SC_Static && isa<CXXMethodDecl>(NewFD) && 4708 !CurContext->isRecord()) { 4709 // C++ [class.static]p1: 4710 // A data or function member of a class may be declared static 4711 // in a class definition, in which case it is a static member of 4712 // the class. 4713 4714 // Complain about the 'static' specifier if it's on an out-of-line 4715 // member function definition. 4716 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4717 diag::err_static_out_of_line) 4718 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 4719 } 4720 } 4721 4722 // Handle GNU asm-label extension (encoded as an attribute). 4723 if (Expr *E = (Expr*) D.getAsmLabel()) { 4724 // The parser guarantees this is a string. 4725 StringLiteral *SE = cast<StringLiteral>(E); 4726 NewFD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), Context, 4727 SE->getString())); 4728 } 4729 4730 // Copy the parameter declarations from the declarator D to the function 4731 // declaration NewFD, if they are available. First scavenge them into Params. 4732 SmallVector<ParmVarDecl*, 16> Params; 4733 if (D.isFunctionDeclarator()) { 4734 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 4735 4736 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 4737 // function that takes no arguments, not a function that takes a 4738 // single void argument. 4739 // We let through "const void" here because Sema::GetTypeForDeclarator 4740 // already checks for that case. 4741 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 4742 FTI.ArgInfo[0].Param && 4743 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()) { 4744 // Empty arg list, don't push any params. 4745 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[0].Param); 4746 4747 // In C++, the empty parameter-type-list must be spelled "void"; a 4748 // typedef of void is not permitted. 4749 if (getLangOptions().CPlusPlus && 4750 Param->getType().getUnqualifiedType() != Context.VoidTy) { 4751 bool IsTypeAlias = false; 4752 if (const TypedefType *TT = Param->getType()->getAs<TypedefType>()) 4753 IsTypeAlias = isa<TypeAliasDecl>(TT->getDecl()); 4754 else if (const TemplateSpecializationType *TST = 4755 Param->getType()->getAs<TemplateSpecializationType>()) 4756 IsTypeAlias = TST->isTypeAlias(); 4757 Diag(Param->getLocation(), diag::err_param_typedef_of_void) 4758 << IsTypeAlias; 4759 } 4760 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 4761 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 4762 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 4763 assert(Param->getDeclContext() != NewFD && "Was set before ?"); 4764 Param->setDeclContext(NewFD); 4765 Params.push_back(Param); 4766 4767 if (Param->isInvalidDecl()) 4768 NewFD->setInvalidDecl(); 4769 } 4770 } 4771 4772 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) { 4773 // When we're declaring a function with a typedef, typeof, etc as in the 4774 // following example, we'll need to synthesize (unnamed) 4775 // parameters for use in the declaration. 4776 // 4777 // @code 4778 // typedef void fn(int); 4779 // fn f; 4780 // @endcode 4781 4782 // Synthesize a parameter for each argument type. 4783 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 4784 AE = FT->arg_type_end(); AI != AE; ++AI) { 4785 ParmVarDecl *Param = 4786 BuildParmVarDeclForTypedef(NewFD, D.getIdentifierLoc(), *AI); 4787 Param->setScopeInfo(0, Params.size()); 4788 Params.push_back(Param); 4789 } 4790 } else { 4791 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && 4792 "Should not need args for typedef of non-prototype fn"); 4793 } 4794 // Finally, we know we have the right number of parameters, install them. 4795 NewFD->setParams(Params.data(), Params.size()); 4796 4797 // Process the non-inheritable attributes on this declaration. 4798 ProcessDeclAttributes(S, NewFD, D, 4799 /*NonInheritable=*/true, /*Inheritable=*/false); 4800 4801 if (!getLangOptions().CPlusPlus) { 4802 // Perform semantic checking on the function declaration. 4803 bool isExplicitSpecialization=false; 4804 CheckFunctionDeclaration(S, NewFD, Previous, isExplicitSpecialization, 4805 Redeclaration); 4806 assert((NewFD->isInvalidDecl() || !Redeclaration || 4807 Previous.getResultKind() != LookupResult::FoundOverloaded) && 4808 "previous declaration set still overloaded"); 4809 } else { 4810 // If the declarator is a template-id, translate the parser's template 4811 // argument list into our AST format. 4812 bool HasExplicitTemplateArgs = false; 4813 TemplateArgumentListInfo TemplateArgs; 4814 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) { 4815 TemplateIdAnnotation *TemplateId = D.getName().TemplateId; 4816 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc); 4817 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc); 4818 ASTTemplateArgsPtr TemplateArgsPtr(*this, 4819 TemplateId->getTemplateArgs(), 4820 TemplateId->NumArgs); 4821 translateTemplateArguments(TemplateArgsPtr, 4822 TemplateArgs); 4823 TemplateArgsPtr.release(); 4824 4825 HasExplicitTemplateArgs = true; 4826 4827 if (NewFD->isInvalidDecl()) { 4828 HasExplicitTemplateArgs = false; 4829 } else if (FunctionTemplate) { 4830 // Function template with explicit template arguments. 4831 Diag(D.getIdentifierLoc(), diag::err_function_template_partial_spec) 4832 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc); 4833 4834 HasExplicitTemplateArgs = false; 4835 } else if (!isFunctionTemplateSpecialization && 4836 !D.getDeclSpec().isFriendSpecified()) { 4837 // We have encountered something that the user meant to be a 4838 // specialization (because it has explicitly-specified template 4839 // arguments) but that was not introduced with a "template<>" (or had 4840 // too few of them). 4841 Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header) 4842 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc) 4843 << FixItHint::CreateInsertion( 4844 D.getDeclSpec().getSourceRange().getBegin(), 4845 "template<> "); 4846 isFunctionTemplateSpecialization = true; 4847 } else { 4848 // "friend void foo<>(int);" is an implicit specialization decl. 4849 isFunctionTemplateSpecialization = true; 4850 } 4851 } else if (isFriend && isFunctionTemplateSpecialization) { 4852 // This combination is only possible in a recovery case; the user 4853 // wrote something like: 4854 // template <> friend void foo(int); 4855 // which we're recovering from as if the user had written: 4856 // friend void foo<>(int); 4857 // Go ahead and fake up a template id. 4858 HasExplicitTemplateArgs = true; 4859 TemplateArgs.setLAngleLoc(D.getIdentifierLoc()); 4860 TemplateArgs.setRAngleLoc(D.getIdentifierLoc()); 4861 } 4862 4863 // If it's a friend (and only if it's a friend), it's possible 4864 // that either the specialized function type or the specialized 4865 // template is dependent, and therefore matching will fail. In 4866 // this case, don't check the specialization yet. 4867 if (isFunctionTemplateSpecialization && isFriend && 4868 (NewFD->getType()->isDependentType() || DC->isDependentContext())) { 4869 assert(HasExplicitTemplateArgs && 4870 "friend function specialization without template args"); 4871 if (CheckDependentFunctionTemplateSpecialization(NewFD, TemplateArgs, 4872 Previous)) 4873 NewFD->setInvalidDecl(); 4874 } else if (isFunctionTemplateSpecialization) { 4875 if (CurContext->isDependentContext() && CurContext->isRecord() 4876 && !isFriend) { 4877 isDependentClassScopeExplicitSpecialization = true; 4878 Diag(NewFD->getLocation(), getLangOptions().Microsoft ? 4879 diag::ext_function_specialization_in_class : 4880 diag::err_function_specialization_in_class) 4881 << NewFD->getDeclName(); 4882 } else if (CheckFunctionTemplateSpecialization(NewFD, 4883 (HasExplicitTemplateArgs ? &TemplateArgs : 0), 4884 Previous)) 4885 NewFD->setInvalidDecl(); 4886 4887 // C++ [dcl.stc]p1: 4888 // A storage-class-specifier shall not be specified in an explicit 4889 // specialization (14.7.3) 4890 if (SC != SC_None) { 4891 if (SC != NewFD->getStorageClass()) 4892 Diag(NewFD->getLocation(), 4893 diag::err_explicit_specialization_inconsistent_storage_class) 4894 << SC 4895 << FixItHint::CreateRemoval( 4896 D.getDeclSpec().getStorageClassSpecLoc()); 4897 4898 else 4899 Diag(NewFD->getLocation(), 4900 diag::ext_explicit_specialization_storage_class) 4901 << FixItHint::CreateRemoval( 4902 D.getDeclSpec().getStorageClassSpecLoc()); 4903 } 4904 4905 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD)) { 4906 if (CheckMemberSpecialization(NewFD, Previous)) 4907 NewFD->setInvalidDecl(); 4908 } 4909 4910 // Perform semantic checking on the function declaration. 4911 if (!isDependentClassScopeExplicitSpecialization) 4912 CheckFunctionDeclaration(S, NewFD, Previous, isExplicitSpecialization, 4913 Redeclaration); 4914 4915 assert((NewFD->isInvalidDecl() || !Redeclaration || 4916 Previous.getResultKind() != LookupResult::FoundOverloaded) && 4917 "previous declaration set still overloaded"); 4918 4919 NamedDecl *PrincipalDecl = (FunctionTemplate 4920 ? cast<NamedDecl>(FunctionTemplate) 4921 : NewFD); 4922 4923 if (isFriend && Redeclaration) { 4924 AccessSpecifier Access = AS_public; 4925 if (!NewFD->isInvalidDecl()) 4926 Access = NewFD->getPreviousDeclaration()->getAccess(); 4927 4928 NewFD->setAccess(Access); 4929 if (FunctionTemplate) FunctionTemplate->setAccess(Access); 4930 4931 PrincipalDecl->setObjectOfFriendDecl(true); 4932 } 4933 4934 if (NewFD->isOverloadedOperator() && !DC->isRecord() && 4935 PrincipalDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary)) 4936 PrincipalDecl->setNonMemberOperator(); 4937 4938 // If we have a function template, check the template parameter 4939 // list. This will check and merge default template arguments. 4940 if (FunctionTemplate) { 4941 FunctionTemplateDecl *PrevTemplate = FunctionTemplate->getPreviousDeclaration(); 4942 CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(), 4943 PrevTemplate? PrevTemplate->getTemplateParameters() : 0, 4944 D.getDeclSpec().isFriendSpecified() 4945 ? (IsFunctionDefinition 4946 ? TPC_FriendFunctionTemplateDefinition 4947 : TPC_FriendFunctionTemplate) 4948 : (D.getCXXScopeSpec().isSet() && 4949 DC && DC->isRecord() && 4950 DC->isDependentContext()) 4951 ? TPC_ClassTemplateMember 4952 : TPC_FunctionTemplate); 4953 } 4954 4955 if (NewFD->isInvalidDecl()) { 4956 // Ignore all the rest of this. 4957 } else if (!Redeclaration) { 4958 // Fake up an access specifier if it's supposed to be a class member. 4959 if (isa<CXXRecordDecl>(NewFD->getDeclContext())) 4960 NewFD->setAccess(AS_public); 4961 4962 // Qualified decls generally require a previous declaration. 4963 if (D.getCXXScopeSpec().isSet()) { 4964 // ...with the major exception of templated-scope or 4965 // dependent-scope friend declarations. 4966 4967 // TODO: we currently also suppress this check in dependent 4968 // contexts because (1) the parameter depth will be off when 4969 // matching friend templates and (2) we might actually be 4970 // selecting a friend based on a dependent factor. But there 4971 // are situations where these conditions don't apply and we 4972 // can actually do this check immediately. 4973 if (isFriend && 4974 (TemplateParamLists.size() || 4975 D.getCXXScopeSpec().getScopeRep()->isDependent() || 4976 CurContext->isDependentContext())) { 4977 // ignore these 4978 } else { 4979 // The user tried to provide an out-of-line definition for a 4980 // function that is a member of a class or namespace, but there 4981 // was no such member function declared (C++ [class.mfct]p2, 4982 // C++ [namespace.memdef]p2). For example: 4983 // 4984 // class X { 4985 // void f() const; 4986 // }; 4987 // 4988 // void X::f() { } // ill-formed 4989 // 4990 // Complain about this problem, and attempt to suggest close 4991 // matches (e.g., those that differ only in cv-qualifiers and 4992 // whether the parameter types are references). 4993 4994 DiagnoseInvalidRedeclaration(*this, NewFD, false); 4995 } 4996 4997 // Unqualified local friend declarations are required to resolve 4998 // to something. 4999 } else if (isFriend && cast<CXXRecordDecl>(CurContext)->isLocalClass()) { 5000 DiagnoseInvalidRedeclaration(*this, NewFD, true); 5001 } 5002 5003 } else if (!IsFunctionDefinition && D.getCXXScopeSpec().isSet() && 5004 !isFriend && !isFunctionTemplateSpecialization && 5005 !isExplicitSpecialization) { 5006 // An out-of-line member function declaration must also be a 5007 // definition (C++ [dcl.meaning]p1). 5008 // Note that this is not the case for explicit specializations of 5009 // function templates or member functions of class templates, per 5010 // C++ [temp.expl.spec]p2. We also allow these declarations as an extension 5011 // for compatibility with old SWIG code which likes to generate them. 5012 Diag(NewFD->getLocation(), diag::ext_out_of_line_declaration) 5013 << D.getCXXScopeSpec().getRange(); 5014 } 5015 } 5016 5017 5018 // Handle attributes. We need to have merged decls when handling attributes 5019 // (for example to check for conflicts, etc). 5020 // FIXME: This needs to happen before we merge declarations. Then, 5021 // let attribute merging cope with attribute conflicts. 5022 ProcessDeclAttributes(S, NewFD, D, 5023 /*NonInheritable=*/false, /*Inheritable=*/true); 5024 5025 // attributes declared post-definition are currently ignored 5026 // FIXME: This should happen during attribute merging 5027 if (Redeclaration && Previous.isSingleResult()) { 5028 const FunctionDecl *Def; 5029 FunctionDecl *PrevFD = dyn_cast<FunctionDecl>(Previous.getFoundDecl()); 5030 if (PrevFD && PrevFD->isDefined(Def) && D.hasAttributes()) { 5031 Diag(NewFD->getLocation(), diag::warn_attribute_precede_definition); 5032 Diag(Def->getLocation(), diag::note_previous_definition); 5033 } 5034 } 5035 5036 AddKnownFunctionAttributes(NewFD); 5037 5038 if (NewFD->hasAttr<OverloadableAttr>() && 5039 !NewFD->getType()->getAs<FunctionProtoType>()) { 5040 Diag(NewFD->getLocation(), 5041 diag::err_attribute_overloadable_no_prototype) 5042 << NewFD; 5043 5044 // Turn this into a variadic function with no parameters. 5045 const FunctionType *FT = NewFD->getType()->getAs<FunctionType>(); 5046 FunctionProtoType::ExtProtoInfo EPI; 5047 EPI.Variadic = true; 5048 EPI.ExtInfo = FT->getExtInfo(); 5049 5050 QualType R = Context.getFunctionType(FT->getResultType(), 0, 0, EPI); 5051 NewFD->setType(R); 5052 } 5053 5054 // If there's a #pragma GCC visibility in scope, and this isn't a class 5055 // member, set the visibility of this function. 5056 if (NewFD->getLinkage() == ExternalLinkage && !DC->isRecord()) 5057 AddPushedVisibilityAttribute(NewFD); 5058 5059 // If this is a locally-scoped extern C function, update the 5060 // map of such names. 5061 if (CurContext->isFunctionOrMethod() && NewFD->isExternC() 5062 && !NewFD->isInvalidDecl()) 5063 RegisterLocallyScopedExternCDecl(NewFD, Previous, S); 5064 5065 // Set this FunctionDecl's range up to the right paren. 5066 NewFD->setRangeEnd(D.getSourceRange().getEnd()); 5067 5068 if (getLangOptions().CPlusPlus) { 5069 if (FunctionTemplate) { 5070 if (NewFD->isInvalidDecl()) 5071 FunctionTemplate->setInvalidDecl(); 5072 return FunctionTemplate; 5073 } 5074 } 5075 5076 MarkUnusedFileScopedDecl(NewFD); 5077 5078 if (getLangOptions().CUDA) 5079 if (IdentifierInfo *II = NewFD->getIdentifier()) 5080 if (!NewFD->isInvalidDecl() && 5081 NewFD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 5082 if (II->isStr("cudaConfigureCall")) { 5083 if (!R->getAs<FunctionType>()->getResultType()->isScalarType()) 5084 Diag(NewFD->getLocation(), diag::err_config_scalar_return); 5085 5086 Context.setcudaConfigureCallDecl(NewFD); 5087 } 5088 } 5089 5090 // Here we have an function template explicit specialization at class scope. 5091 // The actually specialization will be postponed to template instatiation 5092 // time via the ClassScopeFunctionSpecializationDecl node. 5093 if (isDependentClassScopeExplicitSpecialization) { 5094 ClassScopeFunctionSpecializationDecl *NewSpec = 5095 ClassScopeFunctionSpecializationDecl::Create( 5096 Context, CurContext, SourceLocation(), 5097 cast<CXXMethodDecl>(NewFD)); 5098 CurContext->addDecl(NewSpec); 5099 AddToScope = false; 5100 } 5101 5102 return NewFD; 5103} 5104 5105/// \brief Perform semantic checking of a new function declaration. 5106/// 5107/// Performs semantic analysis of the new function declaration 5108/// NewFD. This routine performs all semantic checking that does not 5109/// require the actual declarator involved in the declaration, and is 5110/// used both for the declaration of functions as they are parsed 5111/// (called via ActOnDeclarator) and for the declaration of functions 5112/// that have been instantiated via C++ template instantiation (called 5113/// via InstantiateDecl). 5114/// 5115/// \param IsExplicitSpecialiation whether this new function declaration is 5116/// an explicit specialization of the previous declaration. 5117/// 5118/// This sets NewFD->isInvalidDecl() to true if there was an error. 5119void Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD, 5120 LookupResult &Previous, 5121 bool IsExplicitSpecialization, 5122 bool &Redeclaration) { 5123 // If NewFD is already known erroneous, don't do any of this checking. 5124 if (NewFD->isInvalidDecl()) { 5125 // If this is a class member, mark the class invalid immediately. 5126 // This avoids some consistency errors later. 5127 if (isa<CXXMethodDecl>(NewFD)) 5128 cast<CXXMethodDecl>(NewFD)->getParent()->setInvalidDecl(); 5129 5130 return; 5131 } 5132 5133 if (NewFD->getResultType()->isVariablyModifiedType()) { 5134 // Functions returning a variably modified type violate C99 6.7.5.2p2 5135 // because all functions have linkage. 5136 Diag(NewFD->getLocation(), diag::err_vm_func_decl); 5137 return NewFD->setInvalidDecl(); 5138 } 5139 5140 if (NewFD->isMain()) 5141 CheckMain(NewFD); 5142 5143 // Check for a previous declaration of this name. 5144 if (Previous.empty() && NewFD->isExternC()) { 5145 // Since we did not find anything by this name and we're declaring 5146 // an extern "C" function, look for a non-visible extern "C" 5147 // declaration with the same name. 5148 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 5149 = findLocallyScopedExternalDecl(NewFD->getDeclName()); 5150 if (Pos != LocallyScopedExternalDecls.end()) 5151 Previous.addDecl(Pos->second); 5152 } 5153 5154 // Merge or overload the declaration with an existing declaration of 5155 // the same name, if appropriate. 5156 if (!Previous.empty()) { 5157 // Determine whether NewFD is an overload of PrevDecl or 5158 // a declaration that requires merging. If it's an overload, 5159 // there's no more work to do here; we'll just add the new 5160 // function to the scope. 5161 5162 NamedDecl *OldDecl = 0; 5163 if (!AllowOverloadingOfFunction(Previous, Context)) { 5164 Redeclaration = true; 5165 OldDecl = Previous.getFoundDecl(); 5166 } else { 5167 switch (CheckOverload(S, NewFD, Previous, OldDecl, 5168 /*NewIsUsingDecl*/ false)) { 5169 case Ovl_Match: 5170 Redeclaration = true; 5171 break; 5172 5173 case Ovl_NonFunction: 5174 Redeclaration = true; 5175 break; 5176 5177 case Ovl_Overload: 5178 Redeclaration = false; 5179 break; 5180 } 5181 5182 if (!getLangOptions().CPlusPlus && !NewFD->hasAttr<OverloadableAttr>()) { 5183 // If a function name is overloadable in C, then every function 5184 // with that name must be marked "overloadable". 5185 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 5186 << Redeclaration << NewFD; 5187 NamedDecl *OverloadedDecl = 0; 5188 if (Redeclaration) 5189 OverloadedDecl = OldDecl; 5190 else if (!Previous.empty()) 5191 OverloadedDecl = Previous.getRepresentativeDecl(); 5192 if (OverloadedDecl) 5193 Diag(OverloadedDecl->getLocation(), 5194 diag::note_attribute_overloadable_prev_overload); 5195 NewFD->addAttr(::new (Context) OverloadableAttr(SourceLocation(), 5196 Context)); 5197 } 5198 } 5199 5200 if (Redeclaration) { 5201 // NewFD and OldDecl represent declarations that need to be 5202 // merged. 5203 if (MergeFunctionDecl(NewFD, OldDecl)) 5204 return NewFD->setInvalidDecl(); 5205 5206 Previous.clear(); 5207 Previous.addDecl(OldDecl); 5208 5209 if (FunctionTemplateDecl *OldTemplateDecl 5210 = dyn_cast<FunctionTemplateDecl>(OldDecl)) { 5211 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl()); 5212 FunctionTemplateDecl *NewTemplateDecl 5213 = NewFD->getDescribedFunctionTemplate(); 5214 assert(NewTemplateDecl && "Template/non-template mismatch"); 5215 if (CXXMethodDecl *Method 5216 = dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) { 5217 Method->setAccess(OldTemplateDecl->getAccess()); 5218 NewTemplateDecl->setAccess(OldTemplateDecl->getAccess()); 5219 } 5220 5221 // If this is an explicit specialization of a member that is a function 5222 // template, mark it as a member specialization. 5223 if (IsExplicitSpecialization && 5224 NewTemplateDecl->getInstantiatedFromMemberTemplate()) { 5225 NewTemplateDecl->setMemberSpecialization(); 5226 assert(OldTemplateDecl->isMemberSpecialization()); 5227 } 5228 } else { 5229 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions 5230 NewFD->setAccess(OldDecl->getAccess()); 5231 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 5232 } 5233 } 5234 } 5235 5236 // Semantic checking for this function declaration (in isolation). 5237 if (getLangOptions().CPlusPlus) { 5238 // C++-specific checks. 5239 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { 5240 CheckConstructor(Constructor); 5241 } else if (CXXDestructorDecl *Destructor = 5242 dyn_cast<CXXDestructorDecl>(NewFD)) { 5243 CXXRecordDecl *Record = Destructor->getParent(); 5244 QualType ClassType = Context.getTypeDeclType(Record); 5245 5246 // FIXME: Shouldn't we be able to perform this check even when the class 5247 // type is dependent? Both gcc and edg can handle that. 5248 if (!ClassType->isDependentType()) { 5249 DeclarationName Name 5250 = Context.DeclarationNames.getCXXDestructorName( 5251 Context.getCanonicalType(ClassType)); 5252 if (NewFD->getDeclName() != Name) { 5253 Diag(NewFD->getLocation(), diag::err_destructor_name); 5254 return NewFD->setInvalidDecl(); 5255 } 5256 } 5257 } else if (CXXConversionDecl *Conversion 5258 = dyn_cast<CXXConversionDecl>(NewFD)) { 5259 ActOnConversionDeclarator(Conversion); 5260 } 5261 5262 // Find any virtual functions that this function overrides. 5263 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) { 5264 if (!Method->isFunctionTemplateSpecialization() && 5265 !Method->getDescribedFunctionTemplate()) { 5266 if (AddOverriddenMethods(Method->getParent(), Method)) { 5267 // If the function was marked as "static", we have a problem. 5268 if (NewFD->getStorageClass() == SC_Static) { 5269 Diag(NewFD->getLocation(), diag::err_static_overrides_virtual) 5270 << NewFD->getDeclName(); 5271 for (CXXMethodDecl::method_iterator 5272 Overridden = Method->begin_overridden_methods(), 5273 OverriddenEnd = Method->end_overridden_methods(); 5274 Overridden != OverriddenEnd; 5275 ++Overridden) { 5276 Diag((*Overridden)->getLocation(), 5277 diag::note_overridden_virtual_function); 5278 } 5279 } 5280 } 5281 } 5282 } 5283 5284 // Extra checking for C++ overloaded operators (C++ [over.oper]). 5285 if (NewFD->isOverloadedOperator() && 5286 CheckOverloadedOperatorDeclaration(NewFD)) 5287 return NewFD->setInvalidDecl(); 5288 5289 // Extra checking for C++0x literal operators (C++0x [over.literal]). 5290 if (NewFD->getLiteralIdentifier() && 5291 CheckLiteralOperatorDeclaration(NewFD)) 5292 return NewFD->setInvalidDecl(); 5293 5294 // In C++, check default arguments now that we have merged decls. Unless 5295 // the lexical context is the class, because in this case this is done 5296 // during delayed parsing anyway. 5297 if (!CurContext->isRecord()) 5298 CheckCXXDefaultArguments(NewFD); 5299 5300 // If this function declares a builtin function, check the type of this 5301 // declaration against the expected type for the builtin. 5302 if (unsigned BuiltinID = NewFD->getBuiltinID()) { 5303 ASTContext::GetBuiltinTypeError Error; 5304 QualType T = Context.GetBuiltinType(BuiltinID, Error); 5305 if (!T.isNull() && !Context.hasSameType(T, NewFD->getType())) { 5306 // The type of this function differs from the type of the builtin, 5307 // so forget about the builtin entirely. 5308 Context.BuiltinInfo.ForgetBuiltin(BuiltinID, Context.Idents); 5309 } 5310 } 5311 } 5312} 5313 5314void Sema::CheckMain(FunctionDecl* FD) { 5315 // C++ [basic.start.main]p3: A program that declares main to be inline 5316 // or static is ill-formed. 5317 // C99 6.7.4p4: In a hosted environment, the inline function specifier 5318 // shall not appear in a declaration of main. 5319 // static main is not an error under C99, but we should warn about it. 5320 bool isInline = FD->isInlineSpecified(); 5321 bool isStatic = FD->getStorageClass() == SC_Static; 5322 if (isInline || isStatic) { 5323 unsigned diagID = diag::warn_unusual_main_decl; 5324 if (isInline || getLangOptions().CPlusPlus) 5325 diagID = diag::err_unusual_main_decl; 5326 5327 int which = isStatic + (isInline << 1) - 1; 5328 Diag(FD->getLocation(), diagID) << which; 5329 } 5330 5331 QualType T = FD->getType(); 5332 assert(T->isFunctionType() && "function decl is not of function type"); 5333 const FunctionType* FT = T->getAs<FunctionType>(); 5334 5335 if (!Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) { 5336 Diag(FD->getTypeSpecStartLoc(), diag::err_main_returns_nonint); 5337 FD->setInvalidDecl(true); 5338 } 5339 5340 // Treat protoless main() as nullary. 5341 if (isa<FunctionNoProtoType>(FT)) return; 5342 5343 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT); 5344 unsigned nparams = FTP->getNumArgs(); 5345 assert(FD->getNumParams() == nparams); 5346 5347 bool HasExtraParameters = (nparams > 3); 5348 5349 // Darwin passes an undocumented fourth argument of type char**. If 5350 // other platforms start sprouting these, the logic below will start 5351 // getting shifty. 5352 if (nparams == 4 && Context.Target.getTriple().isOSDarwin()) 5353 HasExtraParameters = false; 5354 5355 if (HasExtraParameters) { 5356 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams; 5357 FD->setInvalidDecl(true); 5358 nparams = 3; 5359 } 5360 5361 // FIXME: a lot of the following diagnostics would be improved 5362 // if we had some location information about types. 5363 5364 QualType CharPP = 5365 Context.getPointerType(Context.getPointerType(Context.CharTy)); 5366 QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP }; 5367 5368 for (unsigned i = 0; i < nparams; ++i) { 5369 QualType AT = FTP->getArgType(i); 5370 5371 bool mismatch = true; 5372 5373 if (Context.hasSameUnqualifiedType(AT, Expected[i])) 5374 mismatch = false; 5375 else if (Expected[i] == CharPP) { 5376 // As an extension, the following forms are okay: 5377 // char const ** 5378 // char const * const * 5379 // char * const * 5380 5381 QualifierCollector qs; 5382 const PointerType* PT; 5383 if ((PT = qs.strip(AT)->getAs<PointerType>()) && 5384 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) && 5385 (QualType(qs.strip(PT->getPointeeType()), 0) == Context.CharTy)) { 5386 qs.removeConst(); 5387 mismatch = !qs.empty(); 5388 } 5389 } 5390 5391 if (mismatch) { 5392 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i]; 5393 // TODO: suggest replacing given type with expected type 5394 FD->setInvalidDecl(true); 5395 } 5396 } 5397 5398 if (nparams == 1 && !FD->isInvalidDecl()) { 5399 Diag(FD->getLocation(), diag::warn_main_one_arg); 5400 } 5401 5402 if (!FD->isInvalidDecl() && FD->getDescribedFunctionTemplate()) { 5403 Diag(FD->getLocation(), diag::err_main_template_decl); 5404 FD->setInvalidDecl(); 5405 } 5406} 5407 5408bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 5409 // FIXME: Need strict checking. In C89, we need to check for 5410 // any assignment, increment, decrement, function-calls, or 5411 // commas outside of a sizeof. In C99, it's the same list, 5412 // except that the aforementioned are allowed in unevaluated 5413 // expressions. Everything else falls under the 5414 // "may accept other forms of constant expressions" exception. 5415 // (We never end up here for C++, so the constant expression 5416 // rules there don't matter.) 5417 if (Init->isConstantInitializer(Context, false)) 5418 return false; 5419 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 5420 << Init->getSourceRange(); 5421 return true; 5422} 5423 5424namespace { 5425 // Visits an initialization expression to see if OrigDecl is evaluated in 5426 // its own initialization and throws a warning if it does. 5427 class SelfReferenceChecker 5428 : public EvaluatedExprVisitor<SelfReferenceChecker> { 5429 Sema &S; 5430 Decl *OrigDecl; 5431 5432 public: 5433 typedef EvaluatedExprVisitor<SelfReferenceChecker> Inherited; 5434 5435 SelfReferenceChecker(Sema &S, Decl *OrigDecl) : Inherited(S.Context), 5436 S(S), OrigDecl(OrigDecl) { } 5437 5438 void VisitExpr(Expr *E) { 5439 if (isa<ObjCMessageExpr>(*E)) return; 5440 Inherited::VisitExpr(E); 5441 } 5442 5443 void VisitImplicitCastExpr(ImplicitCastExpr *E) { 5444 CheckForSelfReference(E); 5445 Inherited::VisitImplicitCastExpr(E); 5446 } 5447 5448 void CheckForSelfReference(ImplicitCastExpr *E) { 5449 if (E->getCastKind() != CK_LValueToRValue) return; 5450 Expr* SubExpr = E->getSubExpr()->IgnoreParenImpCasts(); 5451 DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(SubExpr); 5452 if (!DRE) return; 5453 Decl* ReferenceDecl = DRE->getDecl(); 5454 if (OrigDecl != ReferenceDecl) return; 5455 LookupResult Result(S, DRE->getNameInfo(), Sema::LookupOrdinaryName, 5456 Sema::NotForRedeclaration); 5457 S.DiagRuntimeBehavior(SubExpr->getLocStart(), SubExpr, 5458 S.PDiag(diag::warn_uninit_self_reference_in_init) 5459 << Result.getLookupName() 5460 << OrigDecl->getLocation() 5461 << SubExpr->getSourceRange()); 5462 } 5463 }; 5464} 5465 5466/// AddInitializerToDecl - Adds the initializer Init to the 5467/// declaration dcl. If DirectInit is true, this is C++ direct 5468/// initialization rather than copy initialization. 5469void Sema::AddInitializerToDecl(Decl *RealDecl, Expr *Init, 5470 bool DirectInit, bool TypeMayContainAuto) { 5471 // If there is no declaration, there was an error parsing it. Just ignore 5472 // the initializer. 5473 if (RealDecl == 0 || RealDecl->isInvalidDecl()) 5474 return; 5475 5476 // Check for self-references within variable initializers. 5477 if (VarDecl *vd = dyn_cast<VarDecl>(RealDecl)) { 5478 // Variables declared within a function/method body are handled 5479 // by a dataflow analysis. 5480 if (!vd->hasLocalStorage() && !vd->isStaticLocal()) 5481 SelfReferenceChecker(*this, RealDecl).VisitExpr(Init); 5482 } 5483 else { 5484 SelfReferenceChecker(*this, RealDecl).VisitExpr(Init); 5485 } 5486 5487 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 5488 // With declarators parsed the way they are, the parser cannot 5489 // distinguish between a normal initializer and a pure-specifier. 5490 // Thus this grotesque test. 5491 IntegerLiteral *IL; 5492 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 5493 Context.getCanonicalType(IL->getType()) == Context.IntTy) 5494 CheckPureMethod(Method, Init->getSourceRange()); 5495 else { 5496 Diag(Method->getLocation(), diag::err_member_function_initialization) 5497 << Method->getDeclName() << Init->getSourceRange(); 5498 Method->setInvalidDecl(); 5499 } 5500 return; 5501 } 5502 5503 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 5504 if (!VDecl) { 5505 assert(!isa<FieldDecl>(RealDecl) && "field init shouldn't get here"); 5506 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 5507 RealDecl->setInvalidDecl(); 5508 return; 5509 } 5510 5511 // C++0x [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 5512 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 5513 TypeSourceInfo *DeducedType = 0; 5514 if (!DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType)) 5515 Diag(VDecl->getLocation(), diag::err_auto_var_deduction_failure) 5516 << VDecl->getDeclName() << VDecl->getType() << Init->getType() 5517 << Init->getSourceRange(); 5518 if (!DeducedType) { 5519 RealDecl->setInvalidDecl(); 5520 return; 5521 } 5522 VDecl->setTypeSourceInfo(DeducedType); 5523 VDecl->setType(DeducedType->getType()); 5524 5525 // In ARC, infer lifetime. 5526 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(VDecl)) 5527 VDecl->setInvalidDecl(); 5528 5529 // If this is a redeclaration, check that the type we just deduced matches 5530 // the previously declared type. 5531 if (VarDecl *Old = VDecl->getPreviousDeclaration()) 5532 MergeVarDeclTypes(VDecl, Old); 5533 } 5534 5535 5536 // A definition must end up with a complete type, which means it must be 5537 // complete with the restriction that an array type might be completed by the 5538 // initializer; note that later code assumes this restriction. 5539 QualType BaseDeclType = VDecl->getType(); 5540 if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType)) 5541 BaseDeclType = Array->getElementType(); 5542 if (RequireCompleteType(VDecl->getLocation(), BaseDeclType, 5543 diag::err_typecheck_decl_incomplete_type)) { 5544 RealDecl->setInvalidDecl(); 5545 return; 5546 } 5547 5548 // The variable can not have an abstract class type. 5549 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 5550 diag::err_abstract_type_in_decl, 5551 AbstractVariableType)) 5552 VDecl->setInvalidDecl(); 5553 5554 const VarDecl *Def; 5555 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 5556 Diag(VDecl->getLocation(), diag::err_redefinition) 5557 << VDecl->getDeclName(); 5558 Diag(Def->getLocation(), diag::note_previous_definition); 5559 VDecl->setInvalidDecl(); 5560 return; 5561 } 5562 5563 const VarDecl* PrevInit = 0; 5564 if (getLangOptions().CPlusPlus) { 5565 // C++ [class.static.data]p4 5566 // If a static data member is of const integral or const 5567 // enumeration type, its declaration in the class definition can 5568 // specify a constant-initializer which shall be an integral 5569 // constant expression (5.19). In that case, the member can appear 5570 // in integral constant expressions. The member shall still be 5571 // defined in a namespace scope if it is used in the program and the 5572 // namespace scope definition shall not contain an initializer. 5573 // 5574 // We already performed a redefinition check above, but for static 5575 // data members we also need to check whether there was an in-class 5576 // declaration with an initializer. 5577 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 5578 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 5579 Diag(PrevInit->getLocation(), diag::note_previous_definition); 5580 return; 5581 } 5582 5583 if (VDecl->hasLocalStorage()) 5584 getCurFunction()->setHasBranchProtectedScope(); 5585 5586 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) { 5587 VDecl->setInvalidDecl(); 5588 return; 5589 } 5590 } 5591 5592 // Capture the variable that is being initialized and the style of 5593 // initialization. 5594 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 5595 5596 // FIXME: Poor source location information. 5597 InitializationKind Kind 5598 = DirectInit? InitializationKind::CreateDirect(VDecl->getLocation(), 5599 Init->getLocStart(), 5600 Init->getLocEnd()) 5601 : InitializationKind::CreateCopy(VDecl->getLocation(), 5602 Init->getLocStart()); 5603 5604 // Get the decls type and save a reference for later, since 5605 // CheckInitializerTypes may change it. 5606 QualType DclT = VDecl->getType(), SavT = DclT; 5607 if (VDecl->isLocalVarDecl()) { 5608 if (VDecl->hasExternalStorage()) { // C99 6.7.8p5 5609 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 5610 VDecl->setInvalidDecl(); 5611 } else if (!VDecl->isInvalidDecl()) { 5612 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 5613 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 5614 MultiExprArg(*this, &Init, 1), 5615 &DclT); 5616 if (Result.isInvalid()) { 5617 VDecl->setInvalidDecl(); 5618 return; 5619 } 5620 5621 Init = Result.takeAs<Expr>(); 5622 5623 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 5624 // Don't check invalid declarations to avoid emitting useless diagnostics. 5625 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 5626 if (VDecl->getStorageClass() == SC_Static) // C99 6.7.8p4. 5627 CheckForConstantInitializer(Init, DclT); 5628 } 5629 } 5630 } else if (VDecl->isStaticDataMember() && 5631 VDecl->getLexicalDeclContext()->isRecord()) { 5632 // This is an in-class initialization for a static data member, e.g., 5633 // 5634 // struct S { 5635 // static const int value = 17; 5636 // }; 5637 5638 // Try to perform the initialization regardless. 5639 if (!VDecl->isInvalidDecl()) { 5640 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 5641 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 5642 MultiExprArg(*this, &Init, 1), 5643 &DclT); 5644 if (Result.isInvalid()) { 5645 VDecl->setInvalidDecl(); 5646 return; 5647 } 5648 5649 Init = Result.takeAs<Expr>(); 5650 } 5651 5652 // C++ [class.mem]p4: 5653 // A member-declarator can contain a constant-initializer only 5654 // if it declares a static member (9.4) of const integral or 5655 // const enumeration type, see 9.4.2. 5656 QualType T = VDecl->getType(); 5657 5658 // Do nothing on dependent types. 5659 if (T->isDependentType()) { 5660 5661 // Require constness. 5662 } else if (!T.isConstQualified()) { 5663 Diag(VDecl->getLocation(), diag::err_in_class_initializer_non_const) 5664 << Init->getSourceRange(); 5665 VDecl->setInvalidDecl(); 5666 5667 // We allow integer constant expressions in all cases. 5668 } else if (T->isIntegralOrEnumerationType()) { 5669 // Check whether the expression is a constant expression. 5670 SourceLocation Loc; 5671 if (Init->isValueDependent()) 5672 ; // Nothing to check. 5673 else if (Init->isIntegerConstantExpr(Context, &Loc)) 5674 ; // Ok, it's an ICE! 5675 else if (Init->isEvaluatable(Context)) { 5676 // If we can constant fold the initializer through heroics, accept it, 5677 // but report this as a use of an extension for -pedantic. 5678 Diag(Loc, diag::ext_in_class_initializer_non_constant) 5679 << Init->getSourceRange(); 5680 } else { 5681 // Otherwise, this is some crazy unknown case. Report the issue at the 5682 // location provided by the isIntegerConstantExpr failed check. 5683 Diag(Loc, diag::err_in_class_initializer_non_constant) 5684 << Init->getSourceRange(); 5685 VDecl->setInvalidDecl(); 5686 } 5687 5688 // We allow floating-point constants as an extension in C++03, and 5689 // C++0x has far more complicated rules that we don't really 5690 // implement fully. 5691 } else { 5692 bool Allowed = false; 5693 if (getLangOptions().CPlusPlus0x) { 5694 Allowed = T->isLiteralType(); 5695 } else if (T->isFloatingType()) { // also permits complex, which is ok 5696 Diag(VDecl->getLocation(), diag::ext_in_class_initializer_float_type) 5697 << T << Init->getSourceRange(); 5698 Allowed = true; 5699 } 5700 5701 if (!Allowed) { 5702 Diag(VDecl->getLocation(), diag::err_in_class_initializer_bad_type) 5703 << T << Init->getSourceRange(); 5704 VDecl->setInvalidDecl(); 5705 5706 // TODO: there are probably expressions that pass here that shouldn't. 5707 } else if (!Init->isValueDependent() && 5708 !Init->isConstantInitializer(Context, false)) { 5709 Diag(Init->getExprLoc(), diag::err_in_class_initializer_non_constant) 5710 << Init->getSourceRange(); 5711 VDecl->setInvalidDecl(); 5712 } 5713 } 5714 } else if (VDecl->isFileVarDecl()) { 5715 if (VDecl->getStorageClassAsWritten() == SC_Extern && 5716 (!getLangOptions().CPlusPlus || 5717 !Context.getBaseElementType(VDecl->getType()).isConstQualified())) 5718 Diag(VDecl->getLocation(), diag::warn_extern_init); 5719 if (!VDecl->isInvalidDecl()) { 5720 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 5721 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 5722 MultiExprArg(*this, &Init, 1), 5723 &DclT); 5724 if (Result.isInvalid()) { 5725 VDecl->setInvalidDecl(); 5726 return; 5727 } 5728 5729 Init = Result.takeAs<Expr>(); 5730 } 5731 5732 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 5733 // Don't check invalid declarations to avoid emitting useless diagnostics. 5734 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 5735 // C99 6.7.8p4. All file scoped initializers need to be constant. 5736 CheckForConstantInitializer(Init, DclT); 5737 } 5738 } 5739 // If the type changed, it means we had an incomplete type that was 5740 // completed by the initializer. For example: 5741 // int ary[] = { 1, 3, 5 }; 5742 // "ary" transitions from a VariableArrayType to a ConstantArrayType. 5743 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 5744 VDecl->setType(DclT); 5745 Init->setType(DclT); 5746 } 5747 5748 5749 // If this variable is a local declaration with record type, make sure it 5750 // doesn't have a flexible member initialization. We only support this as a 5751 // global/static definition. 5752 if (VDecl->hasLocalStorage()) 5753 if (const RecordType *RT = VDecl->getType()->getAs<RecordType>()) 5754 if (RT->getDecl()->hasFlexibleArrayMember()) { 5755 // Check whether the initializer tries to initialize the flexible 5756 // array member itself to anything other than an empty initializer list. 5757 if (InitListExpr *ILE = dyn_cast<InitListExpr>(Init)) { 5758 unsigned Index = std::distance(RT->getDecl()->field_begin(), 5759 RT->getDecl()->field_end()) - 1; 5760 if (Index < ILE->getNumInits() && 5761 !(isa<InitListExpr>(ILE->getInit(Index)) && 5762 cast<InitListExpr>(ILE->getInit(Index))->getNumInits() == 0)) { 5763 Diag(VDecl->getLocation(), diag::err_nonstatic_flexible_variable); 5764 VDecl->setInvalidDecl(); 5765 } 5766 } 5767 } 5768 5769 // Check any implicit conversions within the expression. 5770 CheckImplicitConversions(Init, VDecl->getLocation()); 5771 5772 if (!VDecl->isInvalidDecl()) 5773 checkUnsafeAssigns(VDecl->getLocation(), VDecl->getType(), Init); 5774 5775 Init = MaybeCreateExprWithCleanups(Init); 5776 // Attach the initializer to the decl. 5777 VDecl->setInit(Init); 5778 5779 CheckCompleteVariableDeclaration(VDecl); 5780} 5781 5782/// ActOnInitializerError - Given that there was an error parsing an 5783/// initializer for the given declaration, try to return to some form 5784/// of sanity. 5785void Sema::ActOnInitializerError(Decl *D) { 5786 // Our main concern here is re-establishing invariants like "a 5787 // variable's type is either dependent or complete". 5788 if (!D || D->isInvalidDecl()) return; 5789 5790 VarDecl *VD = dyn_cast<VarDecl>(D); 5791 if (!VD) return; 5792 5793 // Auto types are meaningless if we can't make sense of the initializer. 5794 if (ParsingInitForAutoVars.count(D)) { 5795 D->setInvalidDecl(); 5796 return; 5797 } 5798 5799 QualType Ty = VD->getType(); 5800 if (Ty->isDependentType()) return; 5801 5802 // Require a complete type. 5803 if (RequireCompleteType(VD->getLocation(), 5804 Context.getBaseElementType(Ty), 5805 diag::err_typecheck_decl_incomplete_type)) { 5806 VD->setInvalidDecl(); 5807 return; 5808 } 5809 5810 // Require an abstract type. 5811 if (RequireNonAbstractType(VD->getLocation(), Ty, 5812 diag::err_abstract_type_in_decl, 5813 AbstractVariableType)) { 5814 VD->setInvalidDecl(); 5815 return; 5816 } 5817 5818 // Don't bother complaining about constructors or destructors, 5819 // though. 5820} 5821 5822void Sema::ActOnUninitializedDecl(Decl *RealDecl, 5823 bool TypeMayContainAuto) { 5824 // If there is no declaration, there was an error parsing it. Just ignore it. 5825 if (RealDecl == 0) 5826 return; 5827 5828 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 5829 QualType Type = Var->getType(); 5830 5831 // C++0x [dcl.spec.auto]p3 5832 if (TypeMayContainAuto && Type->getContainedAutoType()) { 5833 Diag(Var->getLocation(), diag::err_auto_var_requires_init) 5834 << Var->getDeclName() << Type; 5835 Var->setInvalidDecl(); 5836 return; 5837 } 5838 5839 switch (Var->isThisDeclarationADefinition()) { 5840 case VarDecl::Definition: 5841 if (!Var->isStaticDataMember() || !Var->getAnyInitializer()) 5842 break; 5843 5844 // We have an out-of-line definition of a static data member 5845 // that has an in-class initializer, so we type-check this like 5846 // a declaration. 5847 // 5848 // Fall through 5849 5850 case VarDecl::DeclarationOnly: 5851 // It's only a declaration. 5852 5853 // Block scope. C99 6.7p7: If an identifier for an object is 5854 // declared with no linkage (C99 6.2.2p6), the type for the 5855 // object shall be complete. 5856 if (!Type->isDependentType() && Var->isLocalVarDecl() && 5857 !Var->getLinkage() && !Var->isInvalidDecl() && 5858 RequireCompleteType(Var->getLocation(), Type, 5859 diag::err_typecheck_decl_incomplete_type)) 5860 Var->setInvalidDecl(); 5861 5862 // Make sure that the type is not abstract. 5863 if (!Type->isDependentType() && !Var->isInvalidDecl() && 5864 RequireNonAbstractType(Var->getLocation(), Type, 5865 diag::err_abstract_type_in_decl, 5866 AbstractVariableType)) 5867 Var->setInvalidDecl(); 5868 return; 5869 5870 case VarDecl::TentativeDefinition: 5871 // File scope. C99 6.9.2p2: A declaration of an identifier for an 5872 // object that has file scope without an initializer, and without a 5873 // storage-class specifier or with the storage-class specifier "static", 5874 // constitutes a tentative definition. Note: A tentative definition with 5875 // external linkage is valid (C99 6.2.2p5). 5876 if (!Var->isInvalidDecl()) { 5877 if (const IncompleteArrayType *ArrayT 5878 = Context.getAsIncompleteArrayType(Type)) { 5879 if (RequireCompleteType(Var->getLocation(), 5880 ArrayT->getElementType(), 5881 diag::err_illegal_decl_array_incomplete_type)) 5882 Var->setInvalidDecl(); 5883 } else if (Var->getStorageClass() == SC_Static) { 5884 // C99 6.9.2p3: If the declaration of an identifier for an object is 5885 // a tentative definition and has internal linkage (C99 6.2.2p3), the 5886 // declared type shall not be an incomplete type. 5887 // NOTE: code such as the following 5888 // static struct s; 5889 // struct s { int a; }; 5890 // is accepted by gcc. Hence here we issue a warning instead of 5891 // an error and we do not invalidate the static declaration. 5892 // NOTE: to avoid multiple warnings, only check the first declaration. 5893 if (Var->getPreviousDeclaration() == 0) 5894 RequireCompleteType(Var->getLocation(), Type, 5895 diag::ext_typecheck_decl_incomplete_type); 5896 } 5897 } 5898 5899 // Record the tentative definition; we're done. 5900 if (!Var->isInvalidDecl()) 5901 TentativeDefinitions.push_back(Var); 5902 return; 5903 } 5904 5905 // Provide a specific diagnostic for uninitialized variable 5906 // definitions with incomplete array type. 5907 if (Type->isIncompleteArrayType()) { 5908 Diag(Var->getLocation(), 5909 diag::err_typecheck_incomplete_array_needs_initializer); 5910 Var->setInvalidDecl(); 5911 return; 5912 } 5913 5914 // Provide a specific diagnostic for uninitialized variable 5915 // definitions with reference type. 5916 if (Type->isReferenceType()) { 5917 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 5918 << Var->getDeclName() 5919 << SourceRange(Var->getLocation(), Var->getLocation()); 5920 Var->setInvalidDecl(); 5921 return; 5922 } 5923 5924 // Do not attempt to type-check the default initializer for a 5925 // variable with dependent type. 5926 if (Type->isDependentType()) 5927 return; 5928 5929 if (Var->isInvalidDecl()) 5930 return; 5931 5932 if (RequireCompleteType(Var->getLocation(), 5933 Context.getBaseElementType(Type), 5934 diag::err_typecheck_decl_incomplete_type)) { 5935 Var->setInvalidDecl(); 5936 return; 5937 } 5938 5939 // The variable can not have an abstract class type. 5940 if (RequireNonAbstractType(Var->getLocation(), Type, 5941 diag::err_abstract_type_in_decl, 5942 AbstractVariableType)) { 5943 Var->setInvalidDecl(); 5944 return; 5945 } 5946 5947 // Check for jumps past the implicit initializer. C++0x 5948 // clarifies that this applies to a "variable with automatic 5949 // storage duration", not a "local variable". 5950 // C++0x [stmt.dcl]p3 5951 // A program that jumps from a point where a variable with automatic 5952 // storage duration is not in scope to a point where it is in scope is 5953 // ill-formed unless the variable has scalar type, class type with a 5954 // trivial default constructor and a trivial destructor, a cv-qualified 5955 // version of one of these types, or an array of one of the preceding 5956 // types and is declared without an initializer. 5957 if (getLangOptions().CPlusPlus && Var->hasLocalStorage()) { 5958 if (const RecordType *Record 5959 = Context.getBaseElementType(Type)->getAs<RecordType>()) { 5960 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record->getDecl()); 5961 if ((!getLangOptions().CPlusPlus0x && !CXXRecord->isPOD()) || 5962 (getLangOptions().CPlusPlus0x && 5963 (!CXXRecord->hasTrivialDefaultConstructor() || 5964 !CXXRecord->hasTrivialDestructor()))) 5965 getCurFunction()->setHasBranchProtectedScope(); 5966 } 5967 } 5968 5969 // C++03 [dcl.init]p9: 5970 // If no initializer is specified for an object, and the 5971 // object is of (possibly cv-qualified) non-POD class type (or 5972 // array thereof), the object shall be default-initialized; if 5973 // the object is of const-qualified type, the underlying class 5974 // type shall have a user-declared default 5975 // constructor. Otherwise, if no initializer is specified for 5976 // a non- static object, the object and its subobjects, if 5977 // any, have an indeterminate initial value); if the object 5978 // or any of its subobjects are of const-qualified type, the 5979 // program is ill-formed. 5980 // C++0x [dcl.init]p11: 5981 // If no initializer is specified for an object, the object is 5982 // default-initialized; [...]. 5983 InitializedEntity Entity = InitializedEntity::InitializeVariable(Var); 5984 InitializationKind Kind 5985 = InitializationKind::CreateDefault(Var->getLocation()); 5986 5987 InitializationSequence InitSeq(*this, Entity, Kind, 0, 0); 5988 ExprResult Init = InitSeq.Perform(*this, Entity, Kind, 5989 MultiExprArg(*this, 0, 0)); 5990 if (Init.isInvalid()) 5991 Var->setInvalidDecl(); 5992 else if (Init.get()) 5993 Var->setInit(MaybeCreateExprWithCleanups(Init.get())); 5994 5995 CheckCompleteVariableDeclaration(Var); 5996 } 5997} 5998 5999void Sema::ActOnCXXForRangeDecl(Decl *D) { 6000 VarDecl *VD = dyn_cast<VarDecl>(D); 6001 if (!VD) { 6002 Diag(D->getLocation(), diag::err_for_range_decl_must_be_var); 6003 D->setInvalidDecl(); 6004 return; 6005 } 6006 6007 VD->setCXXForRangeDecl(true); 6008 6009 // for-range-declaration cannot be given a storage class specifier. 6010 int Error = -1; 6011 switch (VD->getStorageClassAsWritten()) { 6012 case SC_None: 6013 break; 6014 case SC_Extern: 6015 Error = 0; 6016 break; 6017 case SC_Static: 6018 Error = 1; 6019 break; 6020 case SC_PrivateExtern: 6021 Error = 2; 6022 break; 6023 case SC_Auto: 6024 Error = 3; 6025 break; 6026 case SC_Register: 6027 Error = 4; 6028 break; 6029 } 6030 // FIXME: constexpr isn't allowed here. 6031 //if (DS.isConstexprSpecified()) 6032 // Error = 5; 6033 if (Error != -1) { 6034 Diag(VD->getOuterLocStart(), diag::err_for_range_storage_class) 6035 << VD->getDeclName() << Error; 6036 D->setInvalidDecl(); 6037 } 6038} 6039 6040void Sema::CheckCompleteVariableDeclaration(VarDecl *var) { 6041 if (var->isInvalidDecl()) return; 6042 6043 // In ARC, don't allow jumps past the implicit initialization of a 6044 // local retaining variable. 6045 if (getLangOptions().ObjCAutoRefCount && 6046 var->hasLocalStorage()) { 6047 switch (var->getType().getObjCLifetime()) { 6048 case Qualifiers::OCL_None: 6049 case Qualifiers::OCL_ExplicitNone: 6050 case Qualifiers::OCL_Autoreleasing: 6051 break; 6052 6053 case Qualifiers::OCL_Weak: 6054 case Qualifiers::OCL_Strong: 6055 getCurFunction()->setHasBranchProtectedScope(); 6056 break; 6057 } 6058 } 6059 6060 // All the following checks are C++ only. 6061 if (!getLangOptions().CPlusPlus) return; 6062 6063 QualType baseType = Context.getBaseElementType(var->getType()); 6064 if (baseType->isDependentType()) return; 6065 6066 // __block variables might require us to capture a copy-initializer. 6067 if (var->hasAttr<BlocksAttr>()) { 6068 // It's currently invalid to ever have a __block variable with an 6069 // array type; should we diagnose that here? 6070 6071 // Regardless, we don't want to ignore array nesting when 6072 // constructing this copy. 6073 QualType type = var->getType(); 6074 6075 if (type->isStructureOrClassType()) { 6076 SourceLocation poi = var->getLocation(); 6077 Expr *varRef = new (Context) DeclRefExpr(var, type, VK_LValue, poi); 6078 ExprResult result = 6079 PerformCopyInitialization( 6080 InitializedEntity::InitializeBlock(poi, type, false), 6081 poi, Owned(varRef)); 6082 if (!result.isInvalid()) { 6083 result = MaybeCreateExprWithCleanups(result); 6084 Expr *init = result.takeAs<Expr>(); 6085 Context.setBlockVarCopyInits(var, init); 6086 } 6087 } 6088 } 6089 6090 // Check for global constructors. 6091 if (!var->getDeclContext()->isDependentContext() && 6092 var->hasGlobalStorage() && 6093 !var->isStaticLocal() && 6094 var->getInit() && 6095 !var->getInit()->isConstantInitializer(Context, 6096 baseType->isReferenceType())) 6097 Diag(var->getLocation(), diag::warn_global_constructor) 6098 << var->getInit()->getSourceRange(); 6099 6100 // Require the destructor. 6101 if (const RecordType *recordType = baseType->getAs<RecordType>()) 6102 FinalizeVarWithDestructor(var, recordType); 6103} 6104 6105/// FinalizeDeclaration - called by ParseDeclarationAfterDeclarator to perform 6106/// any semantic actions necessary after any initializer has been attached. 6107void 6108Sema::FinalizeDeclaration(Decl *ThisDecl) { 6109 // Note that we are no longer parsing the initializer for this declaration. 6110 ParsingInitForAutoVars.erase(ThisDecl); 6111} 6112 6113Sema::DeclGroupPtrTy 6114Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, 6115 Decl **Group, unsigned NumDecls) { 6116 SmallVector<Decl*, 8> Decls; 6117 6118 if (DS.isTypeSpecOwned()) 6119 Decls.push_back(DS.getRepAsDecl()); 6120 6121 for (unsigned i = 0; i != NumDecls; ++i) 6122 if (Decl *D = Group[i]) 6123 Decls.push_back(D); 6124 6125 return BuildDeclaratorGroup(Decls.data(), Decls.size(), 6126 DS.getTypeSpecType() == DeclSpec::TST_auto); 6127} 6128 6129/// BuildDeclaratorGroup - convert a list of declarations into a declaration 6130/// group, performing any necessary semantic checking. 6131Sema::DeclGroupPtrTy 6132Sema::BuildDeclaratorGroup(Decl **Group, unsigned NumDecls, 6133 bool TypeMayContainAuto) { 6134 // C++0x [dcl.spec.auto]p7: 6135 // If the type deduced for the template parameter U is not the same in each 6136 // deduction, the program is ill-formed. 6137 // FIXME: When initializer-list support is added, a distinction is needed 6138 // between the deduced type U and the deduced type which 'auto' stands for. 6139 // auto a = 0, b = { 1, 2, 3 }; 6140 // is legal because the deduced type U is 'int' in both cases. 6141 if (TypeMayContainAuto && NumDecls > 1) { 6142 QualType Deduced; 6143 CanQualType DeducedCanon; 6144 VarDecl *DeducedDecl = 0; 6145 for (unsigned i = 0; i != NumDecls; ++i) { 6146 if (VarDecl *D = dyn_cast<VarDecl>(Group[i])) { 6147 AutoType *AT = D->getType()->getContainedAutoType(); 6148 // Don't reissue diagnostics when instantiating a template. 6149 if (AT && D->isInvalidDecl()) 6150 break; 6151 if (AT && AT->isDeduced()) { 6152 QualType U = AT->getDeducedType(); 6153 CanQualType UCanon = Context.getCanonicalType(U); 6154 if (Deduced.isNull()) { 6155 Deduced = U; 6156 DeducedCanon = UCanon; 6157 DeducedDecl = D; 6158 } else if (DeducedCanon != UCanon) { 6159 Diag(D->getTypeSourceInfo()->getTypeLoc().getBeginLoc(), 6160 diag::err_auto_different_deductions) 6161 << Deduced << DeducedDecl->getDeclName() 6162 << U << D->getDeclName() 6163 << DeducedDecl->getInit()->getSourceRange() 6164 << D->getInit()->getSourceRange(); 6165 D->setInvalidDecl(); 6166 break; 6167 } 6168 } 6169 } 6170 } 6171 } 6172 6173 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, NumDecls)); 6174} 6175 6176 6177/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 6178/// to introduce parameters into function prototype scope. 6179Decl *Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 6180 const DeclSpec &DS = D.getDeclSpec(); 6181 6182 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 6183 VarDecl::StorageClass StorageClass = SC_None; 6184 VarDecl::StorageClass StorageClassAsWritten = SC_None; 6185 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 6186 StorageClass = SC_Register; 6187 StorageClassAsWritten = SC_Register; 6188 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 6189 Diag(DS.getStorageClassSpecLoc(), 6190 diag::err_invalid_storage_class_in_func_decl); 6191 D.getMutableDeclSpec().ClearStorageClassSpecs(); 6192 } 6193 6194 if (D.getDeclSpec().isThreadSpecified()) 6195 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 6196 if (D.getDeclSpec().isConstexprSpecified()) 6197 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 6198 << 0; 6199 6200 DiagnoseFunctionSpecifiers(D); 6201 6202 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6203 QualType parmDeclType = TInfo->getType(); 6204 6205 if (getLangOptions().CPlusPlus) { 6206 // Check that there are no default arguments inside the type of this 6207 // parameter. 6208 CheckExtraCXXDefaultArguments(D); 6209 6210 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 6211 if (D.getCXXScopeSpec().isSet()) { 6212 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 6213 << D.getCXXScopeSpec().getRange(); 6214 D.getCXXScopeSpec().clear(); 6215 } 6216 } 6217 6218 // Ensure we have a valid name 6219 IdentifierInfo *II = 0; 6220 if (D.hasName()) { 6221 II = D.getIdentifier(); 6222 if (!II) { 6223 Diag(D.getIdentifierLoc(), diag::err_bad_parameter_name) 6224 << GetNameForDeclarator(D).getName().getAsString(); 6225 D.setInvalidType(true); 6226 } 6227 } 6228 6229 // Check for redeclaration of parameters, e.g. int foo(int x, int x); 6230 if (II) { 6231 LookupResult R(*this, II, D.getIdentifierLoc(), LookupOrdinaryName, 6232 ForRedeclaration); 6233 LookupName(R, S); 6234 if (R.isSingleResult()) { 6235 NamedDecl *PrevDecl = R.getFoundDecl(); 6236 if (PrevDecl->isTemplateParameter()) { 6237 // Maybe we will complain about the shadowed template parameter. 6238 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 6239 // Just pretend that we didn't see the previous declaration. 6240 PrevDecl = 0; 6241 } else if (S->isDeclScope(PrevDecl)) { 6242 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 6243 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 6244 6245 // Recover by removing the name 6246 II = 0; 6247 D.SetIdentifier(0, D.getIdentifierLoc()); 6248 D.setInvalidType(true); 6249 } 6250 } 6251 } 6252 6253 // Temporarily put parameter variables in the translation unit, not 6254 // the enclosing context. This prevents them from accidentally 6255 // looking like class members in C++. 6256 ParmVarDecl *New = CheckParameter(Context.getTranslationUnitDecl(), 6257 D.getSourceRange().getBegin(), 6258 D.getIdentifierLoc(), II, 6259 parmDeclType, TInfo, 6260 StorageClass, StorageClassAsWritten); 6261 6262 if (D.isInvalidType()) 6263 New->setInvalidDecl(); 6264 6265 assert(S->isFunctionPrototypeScope()); 6266 assert(S->getFunctionPrototypeDepth() >= 1); 6267 New->setScopeInfo(S->getFunctionPrototypeDepth() - 1, 6268 S->getNextFunctionPrototypeIndex()); 6269 6270 // Add the parameter declaration into this scope. 6271 S->AddDecl(New); 6272 if (II) 6273 IdResolver.AddDecl(New); 6274 6275 ProcessDeclAttributes(S, New, D); 6276 6277 if (New->hasAttr<BlocksAttr>()) { 6278 Diag(New->getLocation(), diag::err_block_on_nonlocal); 6279 } 6280 return New; 6281} 6282 6283/// \brief Synthesizes a variable for a parameter arising from a 6284/// typedef. 6285ParmVarDecl *Sema::BuildParmVarDeclForTypedef(DeclContext *DC, 6286 SourceLocation Loc, 6287 QualType T) { 6288 /* FIXME: setting StartLoc == Loc. 6289 Would it be worth to modify callers so as to provide proper source 6290 location for the unnamed parameters, embedding the parameter's type? */ 6291 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, Loc, Loc, 0, 6292 T, Context.getTrivialTypeSourceInfo(T, Loc), 6293 SC_None, SC_None, 0); 6294 Param->setImplicit(); 6295 return Param; 6296} 6297 6298void Sema::DiagnoseUnusedParameters(ParmVarDecl * const *Param, 6299 ParmVarDecl * const *ParamEnd) { 6300 // Don't diagnose unused-parameter errors in template instantiations; we 6301 // will already have done so in the template itself. 6302 if (!ActiveTemplateInstantiations.empty()) 6303 return; 6304 6305 for (; Param != ParamEnd; ++Param) { 6306 if (!(*Param)->isUsed() && (*Param)->getDeclName() && 6307 !(*Param)->hasAttr<UnusedAttr>()) { 6308 Diag((*Param)->getLocation(), diag::warn_unused_parameter) 6309 << (*Param)->getDeclName(); 6310 } 6311 } 6312} 6313 6314void Sema::DiagnoseSizeOfParametersAndReturnValue(ParmVarDecl * const *Param, 6315 ParmVarDecl * const *ParamEnd, 6316 QualType ReturnTy, 6317 NamedDecl *D) { 6318 if (LangOpts.NumLargeByValueCopy == 0) // No check. 6319 return; 6320 6321 // Warn if the return value is pass-by-value and larger than the specified 6322 // threshold. 6323 if (ReturnTy.isPODType(Context)) { 6324 unsigned Size = Context.getTypeSizeInChars(ReturnTy).getQuantity(); 6325 if (Size > LangOpts.NumLargeByValueCopy) 6326 Diag(D->getLocation(), diag::warn_return_value_size) 6327 << D->getDeclName() << Size; 6328 } 6329 6330 // Warn if any parameter is pass-by-value and larger than the specified 6331 // threshold. 6332 for (; Param != ParamEnd; ++Param) { 6333 QualType T = (*Param)->getType(); 6334 if (!T.isPODType(Context)) 6335 continue; 6336 unsigned Size = Context.getTypeSizeInChars(T).getQuantity(); 6337 if (Size > LangOpts.NumLargeByValueCopy) 6338 Diag((*Param)->getLocation(), diag::warn_parameter_size) 6339 << (*Param)->getDeclName() << Size; 6340 } 6341} 6342 6343ParmVarDecl *Sema::CheckParameter(DeclContext *DC, SourceLocation StartLoc, 6344 SourceLocation NameLoc, IdentifierInfo *Name, 6345 QualType T, TypeSourceInfo *TSInfo, 6346 VarDecl::StorageClass StorageClass, 6347 VarDecl::StorageClass StorageClassAsWritten) { 6348 // In ARC, infer a lifetime qualifier for appropriate parameter types. 6349 if (getLangOptions().ObjCAutoRefCount && 6350 T.getObjCLifetime() == Qualifiers::OCL_None && 6351 T->isObjCLifetimeType()) { 6352 6353 Qualifiers::ObjCLifetime lifetime; 6354 6355 // Special cases for arrays: 6356 // - if it's const, use __unsafe_unretained 6357 // - otherwise, it's an error 6358 if (T->isArrayType()) { 6359 if (!T.isConstQualified()) { 6360 Diag(NameLoc, diag::err_arc_array_param_no_ownership) 6361 << TSInfo->getTypeLoc().getSourceRange(); 6362 } 6363 lifetime = Qualifiers::OCL_ExplicitNone; 6364 } else { 6365 lifetime = T->getObjCARCImplicitLifetime(); 6366 } 6367 T = Context.getLifetimeQualifiedType(T, lifetime); 6368 } 6369 6370 ParmVarDecl *New = ParmVarDecl::Create(Context, DC, StartLoc, NameLoc, Name, 6371 Context.getAdjustedParameterType(T), 6372 TSInfo, 6373 StorageClass, StorageClassAsWritten, 6374 0); 6375 6376 // Parameters can not be abstract class types. 6377 // For record types, this is done by the AbstractClassUsageDiagnoser once 6378 // the class has been completely parsed. 6379 if (!CurContext->isRecord() && 6380 RequireNonAbstractType(NameLoc, T, diag::err_abstract_type_in_decl, 6381 AbstractParamType)) 6382 New->setInvalidDecl(); 6383 6384 // Parameter declarators cannot be interface types. All ObjC objects are 6385 // passed by reference. 6386 if (T->isObjCObjectType()) { 6387 Diag(NameLoc, 6388 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T 6389 << FixItHint::CreateInsertion(NameLoc, "*"); 6390 T = Context.getObjCObjectPointerType(T); 6391 New->setType(T); 6392 } 6393 6394 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage 6395 // duration shall not be qualified by an address-space qualifier." 6396 // Since all parameters have automatic store duration, they can not have 6397 // an address space. 6398 if (T.getAddressSpace() != 0) { 6399 Diag(NameLoc, diag::err_arg_with_address_space); 6400 New->setInvalidDecl(); 6401 } 6402 6403 return New; 6404} 6405 6406void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 6407 SourceLocation LocAfterDecls) { 6408 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 6409 6410 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 6411 // for a K&R function. 6412 if (!FTI.hasPrototype) { 6413 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 6414 --i; 6415 if (FTI.ArgInfo[i].Param == 0) { 6416 llvm::SmallString<256> Code; 6417 llvm::raw_svector_ostream(Code) << " int " 6418 << FTI.ArgInfo[i].Ident->getName() 6419 << ";\n"; 6420 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 6421 << FTI.ArgInfo[i].Ident 6422 << FixItHint::CreateInsertion(LocAfterDecls, Code.str()); 6423 6424 // Implicitly declare the argument as type 'int' for lack of a better 6425 // type. 6426 AttributeFactory attrs; 6427 DeclSpec DS(attrs); 6428 const char* PrevSpec; // unused 6429 unsigned DiagID; // unused 6430 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 6431 PrevSpec, DiagID); 6432 Declarator ParamD(DS, Declarator::KNRTypeListContext); 6433 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 6434 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 6435 } 6436 } 6437 } 6438} 6439 6440Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, 6441 Declarator &D) { 6442 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 6443 assert(D.isFunctionDeclarator() && "Not a function declarator!"); 6444 Scope *ParentScope = FnBodyScope->getParent(); 6445 6446 Decl *DP = HandleDeclarator(ParentScope, D, 6447 MultiTemplateParamsArg(*this), 6448 /*IsFunctionDefinition=*/true); 6449 return ActOnStartOfFunctionDef(FnBodyScope, DP); 6450} 6451 6452static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD) { 6453 // Don't warn about invalid declarations. 6454 if (FD->isInvalidDecl()) 6455 return false; 6456 6457 // Or declarations that aren't global. 6458 if (!FD->isGlobal()) 6459 return false; 6460 6461 // Don't warn about C++ member functions. 6462 if (isa<CXXMethodDecl>(FD)) 6463 return false; 6464 6465 // Don't warn about 'main'. 6466 if (FD->isMain()) 6467 return false; 6468 6469 // Don't warn about inline functions. 6470 if (FD->isInlined()) 6471 return false; 6472 6473 // Don't warn about function templates. 6474 if (FD->getDescribedFunctionTemplate()) 6475 return false; 6476 6477 // Don't warn about function template specializations. 6478 if (FD->isFunctionTemplateSpecialization()) 6479 return false; 6480 6481 bool MissingPrototype = true; 6482 for (const FunctionDecl *Prev = FD->getPreviousDeclaration(); 6483 Prev; Prev = Prev->getPreviousDeclaration()) { 6484 // Ignore any declarations that occur in function or method 6485 // scope, because they aren't visible from the header. 6486 if (Prev->getDeclContext()->isFunctionOrMethod()) 6487 continue; 6488 6489 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 6490 break; 6491 } 6492 6493 return MissingPrototype; 6494} 6495 6496void Sema::CheckForFunctionRedefinition(FunctionDecl *FD) { 6497 // Don't complain if we're in GNU89 mode and the previous definition 6498 // was an extern inline function. 6499 const FunctionDecl *Definition; 6500 if (FD->isDefined(Definition) && 6501 !canRedefineFunction(Definition, getLangOptions())) { 6502 if (getLangOptions().GNUMode && Definition->isInlineSpecified() && 6503 Definition->getStorageClass() == SC_Extern) 6504 Diag(FD->getLocation(), diag::err_redefinition_extern_inline) 6505 << FD->getDeclName() << getLangOptions().CPlusPlus; 6506 else 6507 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 6508 Diag(Definition->getLocation(), diag::note_previous_definition); 6509 } 6510} 6511 6512Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Decl *D) { 6513 // Clear the last template instantiation error context. 6514 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation(); 6515 6516 if (!D) 6517 return D; 6518 FunctionDecl *FD = 0; 6519 6520 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(D)) 6521 FD = FunTmpl->getTemplatedDecl(); 6522 else 6523 FD = cast<FunctionDecl>(D); 6524 6525 // Enter a new function scope 6526 PushFunctionScope(); 6527 6528 // See if this is a redefinition. 6529 if (!FD->isLateTemplateParsed()) 6530 CheckForFunctionRedefinition(FD); 6531 6532 // Builtin functions cannot be defined. 6533 if (unsigned BuiltinID = FD->getBuiltinID()) { 6534 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 6535 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 6536 FD->setInvalidDecl(); 6537 } 6538 } 6539 6540 // The return type of a function definition must be complete 6541 // (C99 6.9.1p3, C++ [dcl.fct]p6). 6542 QualType ResultType = FD->getResultType(); 6543 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 6544 !FD->isInvalidDecl() && 6545 RequireCompleteType(FD->getLocation(), ResultType, 6546 diag::err_func_def_incomplete_result)) 6547 FD->setInvalidDecl(); 6548 6549 // GNU warning -Wmissing-prototypes: 6550 // Warn if a global function is defined without a previous 6551 // prototype declaration. This warning is issued even if the 6552 // definition itself provides a prototype. The aim is to detect 6553 // global functions that fail to be declared in header files. 6554 if (ShouldWarnAboutMissingPrototype(FD)) 6555 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 6556 6557 if (FnBodyScope) 6558 PushDeclContext(FnBodyScope, FD); 6559 6560 // Check the validity of our function parameters 6561 CheckParmsForFunctionDef(FD->param_begin(), FD->param_end(), 6562 /*CheckParameterNames=*/true); 6563 6564 // Introduce our parameters into the function scope 6565 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 6566 ParmVarDecl *Param = FD->getParamDecl(p); 6567 Param->setOwningFunction(FD); 6568 6569 // If this has an identifier, add it to the scope stack. 6570 if (Param->getIdentifier() && FnBodyScope) { 6571 CheckShadow(FnBodyScope, Param); 6572 6573 PushOnScopeChains(Param, FnBodyScope); 6574 } 6575 } 6576 6577 // Checking attributes of current function definition 6578 // dllimport attribute. 6579 DLLImportAttr *DA = FD->getAttr<DLLImportAttr>(); 6580 if (DA && (!FD->getAttr<DLLExportAttr>())) { 6581 // dllimport attribute cannot be directly applied to definition. 6582 // Microsoft accepts dllimport for functions defined within class scope. 6583 if (!DA->isInherited() && 6584 !(LangOpts.Microsoft && FD->getLexicalDeclContext()->isRecord())) { 6585 Diag(FD->getLocation(), 6586 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 6587 << "dllimport"; 6588 FD->setInvalidDecl(); 6589 return FD; 6590 } 6591 6592 // Visual C++ appears to not think this is an issue, so only issue 6593 // a warning when Microsoft extensions are disabled. 6594 if (!LangOpts.Microsoft) { 6595 // If a symbol previously declared dllimport is later defined, the 6596 // attribute is ignored in subsequent references, and a warning is 6597 // emitted. 6598 Diag(FD->getLocation(), 6599 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 6600 << FD->getName() << "dllimport"; 6601 } 6602 } 6603 return FD; 6604} 6605 6606/// \brief Given the set of return statements within a function body, 6607/// compute the variables that are subject to the named return value 6608/// optimization. 6609/// 6610/// Each of the variables that is subject to the named return value 6611/// optimization will be marked as NRVO variables in the AST, and any 6612/// return statement that has a marked NRVO variable as its NRVO candidate can 6613/// use the named return value optimization. 6614/// 6615/// This function applies a very simplistic algorithm for NRVO: if every return 6616/// statement in the function has the same NRVO candidate, that candidate is 6617/// the NRVO variable. 6618/// 6619/// FIXME: Employ a smarter algorithm that accounts for multiple return 6620/// statements and the lifetimes of the NRVO candidates. We should be able to 6621/// find a maximal set of NRVO variables. 6622static void ComputeNRVO(Stmt *Body, FunctionScopeInfo *Scope) { 6623 ReturnStmt **Returns = Scope->Returns.data(); 6624 6625 const VarDecl *NRVOCandidate = 0; 6626 for (unsigned I = 0, E = Scope->Returns.size(); I != E; ++I) { 6627 if (!Returns[I]->getNRVOCandidate()) 6628 return; 6629 6630 if (!NRVOCandidate) 6631 NRVOCandidate = Returns[I]->getNRVOCandidate(); 6632 else if (NRVOCandidate != Returns[I]->getNRVOCandidate()) 6633 return; 6634 } 6635 6636 if (NRVOCandidate) 6637 const_cast<VarDecl*>(NRVOCandidate)->setNRVOVariable(true); 6638} 6639 6640Decl *Sema::ActOnFinishFunctionBody(Decl *D, Stmt *BodyArg) { 6641 return ActOnFinishFunctionBody(D, move(BodyArg), false); 6642} 6643 6644Decl *Sema::ActOnFinishFunctionBody(Decl *dcl, Stmt *Body, 6645 bool IsInstantiation) { 6646 FunctionDecl *FD = 0; 6647 FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl); 6648 if (FunTmpl) 6649 FD = FunTmpl->getTemplatedDecl(); 6650 else 6651 FD = dyn_cast_or_null<FunctionDecl>(dcl); 6652 6653 sema::AnalysisBasedWarnings::Policy WP = AnalysisWarnings.getDefaultPolicy(); 6654 sema::AnalysisBasedWarnings::Policy *ActivePolicy = 0; 6655 6656 if (FD) { 6657 FD->setBody(Body); 6658 if (FD->isMain()) { 6659 // C and C++ allow for main to automagically return 0. 6660 // Implements C++ [basic.start.main]p5 and C99 5.1.2.2.3. 6661 FD->setHasImplicitReturnZero(true); 6662 WP.disableCheckFallThrough(); 6663 } else if (FD->hasAttr<NakedAttr>()) { 6664 // If the function is marked 'naked', don't complain about missing return 6665 // statements. 6666 WP.disableCheckFallThrough(); 6667 } 6668 6669 // MSVC permits the use of pure specifier (=0) on function definition, 6670 // defined at class scope, warn about this non standard construct. 6671 if (getLangOptions().Microsoft && FD->isPure()) 6672 Diag(FD->getLocation(), diag::warn_pure_function_definition); 6673 6674 if (!FD->isInvalidDecl()) { 6675 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end()); 6676 DiagnoseSizeOfParametersAndReturnValue(FD->param_begin(), FD->param_end(), 6677 FD->getResultType(), FD); 6678 6679 // If this is a constructor, we need a vtable. 6680 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(FD)) 6681 MarkVTableUsed(FD->getLocation(), Constructor->getParent()); 6682 6683 ComputeNRVO(Body, getCurFunction()); 6684 } 6685 6686 assert(FD == getCurFunctionDecl() && "Function parsing confused"); 6687 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 6688 assert(MD == getCurMethodDecl() && "Method parsing confused"); 6689 MD->setBody(Body); 6690 if (Body) 6691 MD->setEndLoc(Body->getLocEnd()); 6692 if (!MD->isInvalidDecl()) { 6693 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end()); 6694 DiagnoseSizeOfParametersAndReturnValue(MD->param_begin(), MD->param_end(), 6695 MD->getResultType(), MD); 6696 } 6697 } else { 6698 return 0; 6699 } 6700 6701 // Verify and clean out per-function state. 6702 if (Body) { 6703 // C++ constructors that have function-try-blocks can't have return 6704 // statements in the handlers of that block. (C++ [except.handle]p14) 6705 // Verify this. 6706 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body)) 6707 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); 6708 6709 // Verify that gotos and switch cases don't jump into scopes illegally. 6710 if (getCurFunction()->NeedsScopeChecking() && 6711 !dcl->isInvalidDecl() && 6712 !hasAnyUnrecoverableErrorsInThisFunction()) 6713 DiagnoseInvalidJumps(Body); 6714 6715 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) { 6716 if (!Destructor->getParent()->isDependentType()) 6717 CheckDestructor(Destructor); 6718 6719 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 6720 Destructor->getParent()); 6721 } 6722 6723 // If any errors have occurred, clear out any temporaries that may have 6724 // been leftover. This ensures that these temporaries won't be picked up for 6725 // deletion in some later function. 6726 if (PP.getDiagnostics().hasErrorOccurred() || 6727 PP.getDiagnostics().getSuppressAllDiagnostics()) { 6728 ExprTemporaries.clear(); 6729 ExprNeedsCleanups = false; 6730 } else if (!isa<FunctionTemplateDecl>(dcl)) { 6731 // Since the body is valid, issue any analysis-based warnings that are 6732 // enabled. 6733 ActivePolicy = &WP; 6734 } 6735 6736 assert(ExprTemporaries.empty() && "Leftover temporaries in function"); 6737 assert(!ExprNeedsCleanups && "Unaccounted cleanups in function"); 6738 } 6739 6740 if (!IsInstantiation) 6741 PopDeclContext(); 6742 6743 PopFunctionOrBlockScope(ActivePolicy, dcl); 6744 6745 // If any errors have occurred, clear out any temporaries that may have 6746 // been leftover. This ensures that these temporaries won't be picked up for 6747 // deletion in some later function. 6748 if (getDiagnostics().hasErrorOccurred()) { 6749 ExprTemporaries.clear(); 6750 ExprNeedsCleanups = false; 6751 } 6752 6753 return dcl; 6754} 6755 6756/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 6757/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 6758NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 6759 IdentifierInfo &II, Scope *S) { 6760 // Before we produce a declaration for an implicitly defined 6761 // function, see whether there was a locally-scoped declaration of 6762 // this name as a function or variable. If so, use that 6763 // (non-visible) declaration, and complain about it. 6764 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 6765 = findLocallyScopedExternalDecl(&II); 6766 if (Pos != LocallyScopedExternalDecls.end()) { 6767 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 6768 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 6769 return Pos->second; 6770 } 6771 6772 // Extension in C99. Legal in C90, but warn about it. 6773 if (II.getName().startswith("__builtin_")) 6774 Diag(Loc, diag::warn_builtin_unknown) << &II; 6775 else if (getLangOptions().C99) 6776 Diag(Loc, diag::ext_implicit_function_decl) << &II; 6777 else 6778 Diag(Loc, diag::warn_implicit_function_decl) << &II; 6779 6780 // Set a Declarator for the implicit definition: int foo(); 6781 const char *Dummy; 6782 AttributeFactory attrFactory; 6783 DeclSpec DS(attrFactory); 6784 unsigned DiagID; 6785 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID); 6786 (void)Error; // Silence warning. 6787 assert(!Error && "Error setting up implicit decl!"); 6788 Declarator D(DS, Declarator::BlockContext); 6789 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0, 6790 0, 0, true, SourceLocation(), 6791 SourceLocation(), 6792 EST_None, SourceLocation(), 6793 0, 0, 0, 0, Loc, Loc, D), 6794 DS.getAttributes(), 6795 SourceLocation()); 6796 D.SetIdentifier(&II, Loc); 6797 6798 // Insert this function into translation-unit scope. 6799 6800 DeclContext *PrevDC = CurContext; 6801 CurContext = Context.getTranslationUnitDecl(); 6802 6803 FunctionDecl *FD = dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D)); 6804 FD->setImplicit(); 6805 6806 CurContext = PrevDC; 6807 6808 AddKnownFunctionAttributes(FD); 6809 6810 return FD; 6811} 6812 6813/// \brief Adds any function attributes that we know a priori based on 6814/// the declaration of this function. 6815/// 6816/// These attributes can apply both to implicitly-declared builtins 6817/// (like __builtin___printf_chk) or to library-declared functions 6818/// like NSLog or printf. 6819/// 6820/// We need to check for duplicate attributes both here and where user-written 6821/// attributes are applied to declarations. 6822void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 6823 if (FD->isInvalidDecl()) 6824 return; 6825 6826 // If this is a built-in function, map its builtin attributes to 6827 // actual attributes. 6828 if (unsigned BuiltinID = FD->getBuiltinID()) { 6829 // Handle printf-formatting attributes. 6830 unsigned FormatIdx; 6831 bool HasVAListArg; 6832 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 6833 if (!FD->getAttr<FormatAttr>()) 6834 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 6835 "printf", FormatIdx+1, 6836 HasVAListArg ? 0 : FormatIdx+2)); 6837 } 6838 if (Context.BuiltinInfo.isScanfLike(BuiltinID, FormatIdx, 6839 HasVAListArg)) { 6840 if (!FD->getAttr<FormatAttr>()) 6841 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 6842 "scanf", FormatIdx+1, 6843 HasVAListArg ? 0 : FormatIdx+2)); 6844 } 6845 6846 // Mark const if we don't care about errno and that is the only 6847 // thing preventing the function from being const. This allows 6848 // IRgen to use LLVM intrinsics for such functions. 6849 if (!getLangOptions().MathErrno && 6850 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 6851 if (!FD->getAttr<ConstAttr>()) 6852 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 6853 } 6854 6855 if (Context.BuiltinInfo.isNoThrow(BuiltinID) && !FD->getAttr<NoThrowAttr>()) 6856 FD->addAttr(::new (Context) NoThrowAttr(FD->getLocation(), Context)); 6857 if (Context.BuiltinInfo.isConst(BuiltinID) && !FD->getAttr<ConstAttr>()) 6858 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 6859 } 6860 6861 IdentifierInfo *Name = FD->getIdentifier(); 6862 if (!Name) 6863 return; 6864 if ((!getLangOptions().CPlusPlus && 6865 FD->getDeclContext()->isTranslationUnit()) || 6866 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 6867 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 6868 LinkageSpecDecl::lang_c)) { 6869 // Okay: this could be a libc/libm/Objective-C function we know 6870 // about. 6871 } else 6872 return; 6873 6874 if (Name->isStr("NSLog") || Name->isStr("NSLogv")) { 6875 // FIXME: NSLog and NSLogv should be target specific 6876 if (const FormatAttr *Format = FD->getAttr<FormatAttr>()) { 6877 // FIXME: We known better than our headers. 6878 const_cast<FormatAttr *>(Format)->setType(Context, "printf"); 6879 } else 6880 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 6881 "printf", 1, 6882 Name->isStr("NSLogv") ? 0 : 2)); 6883 } else if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { 6884 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be 6885 // target-specific builtins, perhaps? 6886 if (!FD->getAttr<FormatAttr>()) 6887 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 6888 "printf", 2, 6889 Name->isStr("vasprintf") ? 0 : 3)); 6890 } 6891} 6892 6893TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 6894 TypeSourceInfo *TInfo) { 6895 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 6896 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 6897 6898 if (!TInfo) { 6899 assert(D.isInvalidType() && "no declarator info for valid type"); 6900 TInfo = Context.getTrivialTypeSourceInfo(T); 6901 } 6902 6903 // Scope manipulation handled by caller. 6904 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 6905 D.getSourceRange().getBegin(), 6906 D.getIdentifierLoc(), 6907 D.getIdentifier(), 6908 TInfo); 6909 6910 // Bail out immediately if we have an invalid declaration. 6911 if (D.isInvalidType()) { 6912 NewTD->setInvalidDecl(); 6913 return NewTD; 6914 } 6915 6916 // C++ [dcl.typedef]p8: 6917 // If the typedef declaration defines an unnamed class (or 6918 // enum), the first typedef-name declared by the declaration 6919 // to be that class type (or enum type) is used to denote the 6920 // class type (or enum type) for linkage purposes only. 6921 // We need to check whether the type was declared in the declaration. 6922 switch (D.getDeclSpec().getTypeSpecType()) { 6923 case TST_enum: 6924 case TST_struct: 6925 case TST_union: 6926 case TST_class: { 6927 TagDecl *tagFromDeclSpec = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 6928 6929 // Do nothing if the tag is not anonymous or already has an 6930 // associated typedef (from an earlier typedef in this decl group). 6931 if (tagFromDeclSpec->getIdentifier()) break; 6932 if (tagFromDeclSpec->getTypedefNameForAnonDecl()) break; 6933 6934 // A well-formed anonymous tag must always be a TUK_Definition. 6935 assert(tagFromDeclSpec->isThisDeclarationADefinition()); 6936 6937 // The type must match the tag exactly; no qualifiers allowed. 6938 if (!Context.hasSameType(T, Context.getTagDeclType(tagFromDeclSpec))) 6939 break; 6940 6941 // Otherwise, set this is the anon-decl typedef for the tag. 6942 tagFromDeclSpec->setTypedefNameForAnonDecl(NewTD); 6943 break; 6944 } 6945 6946 default: 6947 break; 6948 } 6949 6950 return NewTD; 6951} 6952 6953 6954/// \brief Determine whether a tag with a given kind is acceptable 6955/// as a redeclaration of the given tag declaration. 6956/// 6957/// \returns true if the new tag kind is acceptable, false otherwise. 6958bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, 6959 TagTypeKind NewTag, bool isDefinition, 6960 SourceLocation NewTagLoc, 6961 const IdentifierInfo &Name) { 6962 // C++ [dcl.type.elab]p3: 6963 // The class-key or enum keyword present in the 6964 // elaborated-type-specifier shall agree in kind with the 6965 // declaration to which the name in the elaborated-type-specifier 6966 // refers. This rule also applies to the form of 6967 // elaborated-type-specifier that declares a class-name or 6968 // friend class since it can be construed as referring to the 6969 // definition of the class. Thus, in any 6970 // elaborated-type-specifier, the enum keyword shall be used to 6971 // refer to an enumeration (7.2), the union class-key shall be 6972 // used to refer to a union (clause 9), and either the class or 6973 // struct class-key shall be used to refer to a class (clause 9) 6974 // declared using the class or struct class-key. 6975 TagTypeKind OldTag = Previous->getTagKind(); 6976 if (!isDefinition || (NewTag != TTK_Class && NewTag != TTK_Struct)) 6977 if (OldTag == NewTag) 6978 return true; 6979 6980 if ((OldTag == TTK_Struct || OldTag == TTK_Class) && 6981 (NewTag == TTK_Struct || NewTag == TTK_Class)) { 6982 // Warn about the struct/class tag mismatch. 6983 bool isTemplate = false; 6984 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) 6985 isTemplate = Record->getDescribedClassTemplate(); 6986 6987 if (!ActiveTemplateInstantiations.empty()) { 6988 // In a template instantiation, do not offer fix-its for tag mismatches 6989 // since they usually mess up the template instead of fixing the problem. 6990 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 6991 << (NewTag == TTK_Class) << isTemplate << &Name; 6992 return true; 6993 } 6994 6995 if (isDefinition) { 6996 // On definitions, check previous tags and issue a fix-it for each 6997 // one that doesn't match the current tag. 6998 if (Previous->getDefinition()) { 6999 // Don't suggest fix-its for redefinitions. 7000 return true; 7001 } 7002 7003 bool previousMismatch = false; 7004 for (TagDecl::redecl_iterator I(Previous->redecls_begin()), 7005 E(Previous->redecls_end()); I != E; ++I) { 7006 if (I->getTagKind() != NewTag) { 7007 if (!previousMismatch) { 7008 previousMismatch = true; 7009 Diag(NewTagLoc, diag::warn_struct_class_previous_tag_mismatch) 7010 << (NewTag == TTK_Class) << isTemplate << &Name; 7011 } 7012 Diag(I->getInnerLocStart(), diag::note_struct_class_suggestion) 7013 << (NewTag == TTK_Class) 7014 << FixItHint::CreateReplacement(I->getInnerLocStart(), 7015 NewTag == TTK_Class? 7016 "class" : "struct"); 7017 } 7018 } 7019 return true; 7020 } 7021 7022 // Check for a previous definition. If current tag and definition 7023 // are same type, do nothing. If no definition, but disagree with 7024 // with previous tag type, give a warning, but no fix-it. 7025 const TagDecl *Redecl = Previous->getDefinition() ? 7026 Previous->getDefinition() : Previous; 7027 if (Redecl->getTagKind() == NewTag) { 7028 return true; 7029 } 7030 7031 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 7032 << (NewTag == TTK_Class) 7033 << isTemplate << &Name; 7034 Diag(Redecl->getLocation(), diag::note_previous_use); 7035 7036 // If there is a previous defintion, suggest a fix-it. 7037 if (Previous->getDefinition()) { 7038 Diag(NewTagLoc, diag::note_struct_class_suggestion) 7039 << (Redecl->getTagKind() == TTK_Class) 7040 << FixItHint::CreateReplacement(SourceRange(NewTagLoc), 7041 Redecl->getTagKind() == TTK_Class? "class" : "struct"); 7042 } 7043 7044 return true; 7045 } 7046 return false; 7047} 7048 7049/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 7050/// former case, Name will be non-null. In the later case, Name will be null. 7051/// TagSpec indicates what kind of tag this is. TUK indicates whether this is a 7052/// reference/declaration/definition of a tag. 7053Decl *Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK, 7054 SourceLocation KWLoc, CXXScopeSpec &SS, 7055 IdentifierInfo *Name, SourceLocation NameLoc, 7056 AttributeList *Attr, AccessSpecifier AS, 7057 MultiTemplateParamsArg TemplateParameterLists, 7058 bool &OwnedDecl, bool &IsDependent, 7059 bool ScopedEnum, bool ScopedEnumUsesClassTag, 7060 TypeResult UnderlyingType) { 7061 // If this is not a definition, it must have a name. 7062 assert((Name != 0 || TUK == TUK_Definition) && 7063 "Nameless record must be a definition!"); 7064 assert(TemplateParameterLists.size() == 0 || TUK != TUK_Reference); 7065 7066 OwnedDecl = false; 7067 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 7068 7069 // FIXME: Check explicit specializations more carefully. 7070 bool isExplicitSpecialization = false; 7071 bool Invalid = false; 7072 7073 // We only need to do this matching if we have template parameters 7074 // or a scope specifier, which also conveniently avoids this work 7075 // for non-C++ cases. 7076 if (TemplateParameterLists.size() > 0 || 7077 (SS.isNotEmpty() && TUK != TUK_Reference)) { 7078 if (TemplateParameterList *TemplateParams 7079 = MatchTemplateParametersToScopeSpecifier(KWLoc, NameLoc, SS, 7080 TemplateParameterLists.get(), 7081 TemplateParameterLists.size(), 7082 TUK == TUK_Friend, 7083 isExplicitSpecialization, 7084 Invalid)) { 7085 if (TemplateParams->size() > 0) { 7086 // This is a declaration or definition of a class template (which may 7087 // be a member of another template). 7088 7089 if (Invalid) 7090 return 0; 7091 7092 OwnedDecl = false; 7093 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc, 7094 SS, Name, NameLoc, Attr, 7095 TemplateParams, AS, 7096 TemplateParameterLists.size() - 1, 7097 (TemplateParameterList**) TemplateParameterLists.release()); 7098 return Result.get(); 7099 } else { 7100 // The "template<>" header is extraneous. 7101 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 7102 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 7103 isExplicitSpecialization = true; 7104 } 7105 } 7106 } 7107 7108 // Figure out the underlying type if this a enum declaration. We need to do 7109 // this early, because it's needed to detect if this is an incompatible 7110 // redeclaration. 7111 llvm::PointerUnion<const Type*, TypeSourceInfo*> EnumUnderlying; 7112 7113 if (Kind == TTK_Enum) { 7114 if (UnderlyingType.isInvalid() || (!UnderlyingType.get() && ScopedEnum)) 7115 // No underlying type explicitly specified, or we failed to parse the 7116 // type, default to int. 7117 EnumUnderlying = Context.IntTy.getTypePtr(); 7118 else if (UnderlyingType.get()) { 7119 // C++0x 7.2p2: The type-specifier-seq of an enum-base shall name an 7120 // integral type; any cv-qualification is ignored. 7121 TypeSourceInfo *TI = 0; 7122 QualType T = GetTypeFromParser(UnderlyingType.get(), &TI); 7123 EnumUnderlying = TI; 7124 7125 SourceLocation UnderlyingLoc = TI->getTypeLoc().getBeginLoc(); 7126 7127 if (!T->isDependentType() && !T->isIntegralType(Context)) { 7128 Diag(UnderlyingLoc, diag::err_enum_invalid_underlying) 7129 << T; 7130 // Recover by falling back to int. 7131 EnumUnderlying = Context.IntTy.getTypePtr(); 7132 } 7133 7134 if (DiagnoseUnexpandedParameterPack(UnderlyingLoc, TI, 7135 UPPC_FixedUnderlyingType)) 7136 EnumUnderlying = Context.IntTy.getTypePtr(); 7137 7138 } else if (getLangOptions().Microsoft) 7139 // Microsoft enums are always of int type. 7140 EnumUnderlying = Context.IntTy.getTypePtr(); 7141 } 7142 7143 DeclContext *SearchDC = CurContext; 7144 DeclContext *DC = CurContext; 7145 bool isStdBadAlloc = false; 7146 7147 RedeclarationKind Redecl = ForRedeclaration; 7148 if (TUK == TUK_Friend || TUK == TUK_Reference) 7149 Redecl = NotForRedeclaration; 7150 7151 LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl); 7152 7153 if (Name && SS.isNotEmpty()) { 7154 // We have a nested-name tag ('struct foo::bar'). 7155 7156 // Check for invalid 'foo::'. 7157 if (SS.isInvalid()) { 7158 Name = 0; 7159 goto CreateNewDecl; 7160 } 7161 7162 // If this is a friend or a reference to a class in a dependent 7163 // context, don't try to make a decl for it. 7164 if (TUK == TUK_Friend || TUK == TUK_Reference) { 7165 DC = computeDeclContext(SS, false); 7166 if (!DC) { 7167 IsDependent = true; 7168 return 0; 7169 } 7170 } else { 7171 DC = computeDeclContext(SS, true); 7172 if (!DC) { 7173 Diag(SS.getRange().getBegin(), diag::err_dependent_nested_name_spec) 7174 << SS.getRange(); 7175 return 0; 7176 } 7177 } 7178 7179 if (RequireCompleteDeclContext(SS, DC)) 7180 return 0; 7181 7182 SearchDC = DC; 7183 // Look-up name inside 'foo::'. 7184 LookupQualifiedName(Previous, DC); 7185 7186 if (Previous.isAmbiguous()) 7187 return 0; 7188 7189 if (Previous.empty()) { 7190 // Name lookup did not find anything. However, if the 7191 // nested-name-specifier refers to the current instantiation, 7192 // and that current instantiation has any dependent base 7193 // classes, we might find something at instantiation time: treat 7194 // this as a dependent elaborated-type-specifier. 7195 // But this only makes any sense for reference-like lookups. 7196 if (Previous.wasNotFoundInCurrentInstantiation() && 7197 (TUK == TUK_Reference || TUK == TUK_Friend)) { 7198 IsDependent = true; 7199 return 0; 7200 } 7201 7202 // A tag 'foo::bar' must already exist. 7203 Diag(NameLoc, diag::err_not_tag_in_scope) 7204 << Kind << Name << DC << SS.getRange(); 7205 Name = 0; 7206 Invalid = true; 7207 goto CreateNewDecl; 7208 } 7209 } else if (Name) { 7210 // If this is a named struct, check to see if there was a previous forward 7211 // declaration or definition. 7212 // FIXME: We're looking into outer scopes here, even when we 7213 // shouldn't be. Doing so can result in ambiguities that we 7214 // shouldn't be diagnosing. 7215 LookupName(Previous, S); 7216 7217 if (Previous.isAmbiguous() && 7218 (TUK == TUK_Definition || TUK == TUK_Declaration)) { 7219 LookupResult::Filter F = Previous.makeFilter(); 7220 while (F.hasNext()) { 7221 NamedDecl *ND = F.next(); 7222 if (ND->getDeclContext()->getRedeclContext() != SearchDC) 7223 F.erase(); 7224 } 7225 F.done(); 7226 } 7227 7228 // Note: there used to be some attempt at recovery here. 7229 if (Previous.isAmbiguous()) 7230 return 0; 7231 7232 if (!getLangOptions().CPlusPlus && TUK != TUK_Reference) { 7233 // FIXME: This makes sure that we ignore the contexts associated 7234 // with C structs, unions, and enums when looking for a matching 7235 // tag declaration or definition. See the similar lookup tweak 7236 // in Sema::LookupName; is there a better way to deal with this? 7237 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 7238 SearchDC = SearchDC->getParent(); 7239 } 7240 } else if (S->isFunctionPrototypeScope()) { 7241 // If this is an enum declaration in function prototype scope, set its 7242 // initial context to the translation unit. 7243 SearchDC = Context.getTranslationUnitDecl(); 7244 } 7245 7246 if (Previous.isSingleResult() && 7247 Previous.getFoundDecl()->isTemplateParameter()) { 7248 // Maybe we will complain about the shadowed template parameter. 7249 DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl()); 7250 // Just pretend that we didn't see the previous declaration. 7251 Previous.clear(); 7252 } 7253 7254 if (getLangOptions().CPlusPlus && Name && DC && StdNamespace && 7255 DC->Equals(getStdNamespace()) && Name->isStr("bad_alloc")) { 7256 // This is a declaration of or a reference to "std::bad_alloc". 7257 isStdBadAlloc = true; 7258 7259 if (Previous.empty() && StdBadAlloc) { 7260 // std::bad_alloc has been implicitly declared (but made invisible to 7261 // name lookup). Fill in this implicit declaration as the previous 7262 // declaration, so that the declarations get chained appropriately. 7263 Previous.addDecl(getStdBadAlloc()); 7264 } 7265 } 7266 7267 // If we didn't find a previous declaration, and this is a reference 7268 // (or friend reference), move to the correct scope. In C++, we 7269 // also need to do a redeclaration lookup there, just in case 7270 // there's a shadow friend decl. 7271 if (Name && Previous.empty() && 7272 (TUK == TUK_Reference || TUK == TUK_Friend)) { 7273 if (Invalid) goto CreateNewDecl; 7274 assert(SS.isEmpty()); 7275 7276 if (TUK == TUK_Reference) { 7277 // C++ [basic.scope.pdecl]p5: 7278 // -- for an elaborated-type-specifier of the form 7279 // 7280 // class-key identifier 7281 // 7282 // if the elaborated-type-specifier is used in the 7283 // decl-specifier-seq or parameter-declaration-clause of a 7284 // function defined in namespace scope, the identifier is 7285 // declared as a class-name in the namespace that contains 7286 // the declaration; otherwise, except as a friend 7287 // declaration, the identifier is declared in the smallest 7288 // non-class, non-function-prototype scope that contains the 7289 // declaration. 7290 // 7291 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 7292 // C structs and unions. 7293 // 7294 // It is an error in C++ to declare (rather than define) an enum 7295 // type, including via an elaborated type specifier. We'll 7296 // diagnose that later; for now, declare the enum in the same 7297 // scope as we would have picked for any other tag type. 7298 // 7299 // GNU C also supports this behavior as part of its incomplete 7300 // enum types extension, while GNU C++ does not. 7301 // 7302 // Find the context where we'll be declaring the tag. 7303 // FIXME: We would like to maintain the current DeclContext as the 7304 // lexical context, 7305 while (SearchDC->isRecord() || SearchDC->isTransparentContext()) 7306 SearchDC = SearchDC->getParent(); 7307 7308 // Find the scope where we'll be declaring the tag. 7309 while (S->isClassScope() || 7310 (getLangOptions().CPlusPlus && 7311 S->isFunctionPrototypeScope()) || 7312 ((S->getFlags() & Scope::DeclScope) == 0) || 7313 (S->getEntity() && 7314 ((DeclContext *)S->getEntity())->isTransparentContext())) 7315 S = S->getParent(); 7316 } else { 7317 assert(TUK == TUK_Friend); 7318 // C++ [namespace.memdef]p3: 7319 // If a friend declaration in a non-local class first declares a 7320 // class or function, the friend class or function is a member of 7321 // the innermost enclosing namespace. 7322 SearchDC = SearchDC->getEnclosingNamespaceContext(); 7323 } 7324 7325 // In C++, we need to do a redeclaration lookup to properly 7326 // diagnose some problems. 7327 if (getLangOptions().CPlusPlus) { 7328 Previous.setRedeclarationKind(ForRedeclaration); 7329 LookupQualifiedName(Previous, SearchDC); 7330 } 7331 } 7332 7333 if (!Previous.empty()) { 7334 NamedDecl *PrevDecl = (*Previous.begin())->getUnderlyingDecl(); 7335 7336 // It's okay to have a tag decl in the same scope as a typedef 7337 // which hides a tag decl in the same scope. Finding this 7338 // insanity with a redeclaration lookup can only actually happen 7339 // in C++. 7340 // 7341 // This is also okay for elaborated-type-specifiers, which is 7342 // technically forbidden by the current standard but which is 7343 // okay according to the likely resolution of an open issue; 7344 // see http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#407 7345 if (getLangOptions().CPlusPlus) { 7346 if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(PrevDecl)) { 7347 if (const TagType *TT = TD->getUnderlyingType()->getAs<TagType>()) { 7348 TagDecl *Tag = TT->getDecl(); 7349 if (Tag->getDeclName() == Name && 7350 Tag->getDeclContext()->getRedeclContext() 7351 ->Equals(TD->getDeclContext()->getRedeclContext())) { 7352 PrevDecl = Tag; 7353 Previous.clear(); 7354 Previous.addDecl(Tag); 7355 Previous.resolveKind(); 7356 } 7357 } 7358 } 7359 } 7360 7361 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 7362 // If this is a use of a previous tag, or if the tag is already declared 7363 // in the same scope (so that the definition/declaration completes or 7364 // rementions the tag), reuse the decl. 7365 if (TUK == TUK_Reference || TUK == TUK_Friend || 7366 isDeclInScope(PrevDecl, SearchDC, S, isExplicitSpecialization)) { 7367 // Make sure that this wasn't declared as an enum and now used as a 7368 // struct or something similar. 7369 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, 7370 TUK == TUK_Definition, KWLoc, 7371 *Name)) { 7372 bool SafeToContinue 7373 = (PrevTagDecl->getTagKind() != TTK_Enum && 7374 Kind != TTK_Enum); 7375 if (SafeToContinue) 7376 Diag(KWLoc, diag::err_use_with_wrong_tag) 7377 << Name 7378 << FixItHint::CreateReplacement(SourceRange(KWLoc), 7379 PrevTagDecl->getKindName()); 7380 else 7381 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 7382 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7383 7384 if (SafeToContinue) 7385 Kind = PrevTagDecl->getTagKind(); 7386 else { 7387 // Recover by making this an anonymous redefinition. 7388 Name = 0; 7389 Previous.clear(); 7390 Invalid = true; 7391 } 7392 } 7393 7394 if (Kind == TTK_Enum && PrevTagDecl->getTagKind() == TTK_Enum) { 7395 const EnumDecl *PrevEnum = cast<EnumDecl>(PrevTagDecl); 7396 7397 // All conflicts with previous declarations are recovered by 7398 // returning the previous declaration. 7399 if (ScopedEnum != PrevEnum->isScoped()) { 7400 Diag(KWLoc, diag::err_enum_redeclare_scoped_mismatch) 7401 << PrevEnum->isScoped(); 7402 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7403 return PrevTagDecl; 7404 } 7405 else if (EnumUnderlying && PrevEnum->isFixed()) { 7406 QualType T; 7407 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 7408 T = TI->getType(); 7409 else 7410 T = QualType(EnumUnderlying.get<const Type*>(), 0); 7411 7412 if (!Context.hasSameUnqualifiedType(T, PrevEnum->getIntegerType())) { 7413 Diag(NameLoc.isValid() ? NameLoc : KWLoc, 7414 diag::err_enum_redeclare_type_mismatch) 7415 << T 7416 << PrevEnum->getIntegerType(); 7417 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7418 return PrevTagDecl; 7419 } 7420 } 7421 else if (!EnumUnderlying.isNull() != PrevEnum->isFixed()) { 7422 Diag(KWLoc, diag::err_enum_redeclare_fixed_mismatch) 7423 << PrevEnum->isFixed(); 7424 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7425 return PrevTagDecl; 7426 } 7427 } 7428 7429 if (!Invalid) { 7430 // If this is a use, just return the declaration we found. 7431 7432 // FIXME: In the future, return a variant or some other clue 7433 // for the consumer of this Decl to know it doesn't own it. 7434 // For our current ASTs this shouldn't be a problem, but will 7435 // need to be changed with DeclGroups. 7436 if ((TUK == TUK_Reference && (!PrevTagDecl->getFriendObjectKind() || 7437 getLangOptions().Microsoft)) || TUK == TUK_Friend) 7438 return PrevTagDecl; 7439 7440 // Diagnose attempts to redefine a tag. 7441 if (TUK == TUK_Definition) { 7442 if (TagDecl *Def = PrevTagDecl->getDefinition()) { 7443 // If we're defining a specialization and the previous definition 7444 // is from an implicit instantiation, don't emit an error 7445 // here; we'll catch this in the general case below. 7446 if (!isExplicitSpecialization || 7447 !isa<CXXRecordDecl>(Def) || 7448 cast<CXXRecordDecl>(Def)->getTemplateSpecializationKind() 7449 == TSK_ExplicitSpecialization) { 7450 Diag(NameLoc, diag::err_redefinition) << Name; 7451 Diag(Def->getLocation(), diag::note_previous_definition); 7452 // If this is a redefinition, recover by making this 7453 // struct be anonymous, which will make any later 7454 // references get the previous definition. 7455 Name = 0; 7456 Previous.clear(); 7457 Invalid = true; 7458 } 7459 } else { 7460 // If the type is currently being defined, complain 7461 // about a nested redefinition. 7462 const TagType *Tag 7463 = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 7464 if (Tag->isBeingDefined()) { 7465 Diag(NameLoc, diag::err_nested_redefinition) << Name; 7466 Diag(PrevTagDecl->getLocation(), 7467 diag::note_previous_definition); 7468 Name = 0; 7469 Previous.clear(); 7470 Invalid = true; 7471 } 7472 } 7473 7474 // Okay, this is definition of a previously declared or referenced 7475 // tag PrevDecl. We're going to create a new Decl for it. 7476 } 7477 } 7478 // If we get here we have (another) forward declaration or we 7479 // have a definition. Just create a new decl. 7480 7481 } else { 7482 // If we get here, this is a definition of a new tag type in a nested 7483 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 7484 // new decl/type. We set PrevDecl to NULL so that the entities 7485 // have distinct types. 7486 Previous.clear(); 7487 } 7488 // If we get here, we're going to create a new Decl. If PrevDecl 7489 // is non-NULL, it's a definition of the tag declared by 7490 // PrevDecl. If it's NULL, we have a new definition. 7491 7492 7493 // Otherwise, PrevDecl is not a tag, but was found with tag 7494 // lookup. This is only actually possible in C++, where a few 7495 // things like templates still live in the tag namespace. 7496 } else { 7497 assert(getLangOptions().CPlusPlus); 7498 7499 // Use a better diagnostic if an elaborated-type-specifier 7500 // found the wrong kind of type on the first 7501 // (non-redeclaration) lookup. 7502 if ((TUK == TUK_Reference || TUK == TUK_Friend) && 7503 !Previous.isForRedeclaration()) { 7504 unsigned Kind = 0; 7505 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 7506 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 7507 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 7508 Diag(NameLoc, diag::err_tag_reference_non_tag) << Kind; 7509 Diag(PrevDecl->getLocation(), diag::note_declared_at); 7510 Invalid = true; 7511 7512 // Otherwise, only diagnose if the declaration is in scope. 7513 } else if (!isDeclInScope(PrevDecl, SearchDC, S, 7514 isExplicitSpecialization)) { 7515 // do nothing 7516 7517 // Diagnose implicit declarations introduced by elaborated types. 7518 } else if (TUK == TUK_Reference || TUK == TUK_Friend) { 7519 unsigned Kind = 0; 7520 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 7521 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 7522 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 7523 Diag(NameLoc, diag::err_tag_reference_conflict) << Kind; 7524 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 7525 Invalid = true; 7526 7527 // Otherwise it's a declaration. Call out a particularly common 7528 // case here. 7529 } else if (TypedefNameDecl *TND = dyn_cast<TypedefNameDecl>(PrevDecl)) { 7530 unsigned Kind = 0; 7531 if (isa<TypeAliasDecl>(PrevDecl)) Kind = 1; 7532 Diag(NameLoc, diag::err_tag_definition_of_typedef) 7533 << Name << Kind << TND->getUnderlyingType(); 7534 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 7535 Invalid = true; 7536 7537 // Otherwise, diagnose. 7538 } else { 7539 // The tag name clashes with something else in the target scope, 7540 // issue an error and recover by making this tag be anonymous. 7541 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 7542 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 7543 Name = 0; 7544 Invalid = true; 7545 } 7546 7547 // The existing declaration isn't relevant to us; we're in a 7548 // new scope, so clear out the previous declaration. 7549 Previous.clear(); 7550 } 7551 } 7552 7553CreateNewDecl: 7554 7555 TagDecl *PrevDecl = 0; 7556 if (Previous.isSingleResult()) 7557 PrevDecl = cast<TagDecl>(Previous.getFoundDecl()); 7558 7559 // If there is an identifier, use the location of the identifier as the 7560 // location of the decl, otherwise use the location of the struct/union 7561 // keyword. 7562 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 7563 7564 // Otherwise, create a new declaration. If there is a previous 7565 // declaration of the same entity, the two will be linked via 7566 // PrevDecl. 7567 TagDecl *New; 7568 7569 bool IsForwardReference = false; 7570 if (Kind == TTK_Enum) { 7571 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 7572 // enum X { A, B, C } D; D should chain to X. 7573 New = EnumDecl::Create(Context, SearchDC, KWLoc, Loc, Name, 7574 cast_or_null<EnumDecl>(PrevDecl), ScopedEnum, 7575 ScopedEnumUsesClassTag, !EnumUnderlying.isNull()); 7576 // If this is an undefined enum, warn. 7577 if (TUK != TUK_Definition && !Invalid) { 7578 TagDecl *Def; 7579 if (getLangOptions().CPlusPlus0x && cast<EnumDecl>(New)->isFixed()) { 7580 // C++0x: 7.2p2: opaque-enum-declaration. 7581 // Conflicts are diagnosed above. Do nothing. 7582 } 7583 else if (PrevDecl && (Def = cast<EnumDecl>(PrevDecl)->getDefinition())) { 7584 Diag(Loc, diag::ext_forward_ref_enum_def) 7585 << New; 7586 Diag(Def->getLocation(), diag::note_previous_definition); 7587 } else { 7588 unsigned DiagID = diag::ext_forward_ref_enum; 7589 if (getLangOptions().Microsoft) 7590 DiagID = diag::ext_ms_forward_ref_enum; 7591 else if (getLangOptions().CPlusPlus) 7592 DiagID = diag::err_forward_ref_enum; 7593 Diag(Loc, DiagID); 7594 7595 // If this is a forward-declared reference to an enumeration, make a 7596 // note of it; we won't actually be introducing the declaration into 7597 // the declaration context. 7598 if (TUK == TUK_Reference) 7599 IsForwardReference = true; 7600 } 7601 } 7602 7603 if (EnumUnderlying) { 7604 EnumDecl *ED = cast<EnumDecl>(New); 7605 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 7606 ED->setIntegerTypeSourceInfo(TI); 7607 else 7608 ED->setIntegerType(QualType(EnumUnderlying.get<const Type*>(), 0)); 7609 ED->setPromotionType(ED->getIntegerType()); 7610 } 7611 7612 } else { 7613 // struct/union/class 7614 7615 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 7616 // struct X { int A; } D; D should chain to X. 7617 if (getLangOptions().CPlusPlus) { 7618 // FIXME: Look for a way to use RecordDecl for simple structs. 7619 New = CXXRecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 7620 cast_or_null<CXXRecordDecl>(PrevDecl)); 7621 7622 if (isStdBadAlloc && (!StdBadAlloc || getStdBadAlloc()->isImplicit())) 7623 StdBadAlloc = cast<CXXRecordDecl>(New); 7624 } else 7625 New = RecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 7626 cast_or_null<RecordDecl>(PrevDecl)); 7627 } 7628 7629 // Maybe add qualifier info. 7630 if (SS.isNotEmpty()) { 7631 if (SS.isSet()) { 7632 New->setQualifierInfo(SS.getWithLocInContext(Context)); 7633 if (TemplateParameterLists.size() > 0) { 7634 New->setTemplateParameterListsInfo(Context, 7635 TemplateParameterLists.size(), 7636 (TemplateParameterList**) TemplateParameterLists.release()); 7637 } 7638 } 7639 else 7640 Invalid = true; 7641 } 7642 7643 if (RecordDecl *RD = dyn_cast<RecordDecl>(New)) { 7644 // Add alignment attributes if necessary; these attributes are checked when 7645 // the ASTContext lays out the structure. 7646 // 7647 // It is important for implementing the correct semantics that this 7648 // happen here (in act on tag decl). The #pragma pack stack is 7649 // maintained as a result of parser callbacks which can occur at 7650 // many points during the parsing of a struct declaration (because 7651 // the #pragma tokens are effectively skipped over during the 7652 // parsing of the struct). 7653 AddAlignmentAttributesForRecord(RD); 7654 7655 AddMsStructLayoutForRecord(RD); 7656 } 7657 7658 // If this is a specialization of a member class (of a class template), 7659 // check the specialization. 7660 if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous)) 7661 Invalid = true; 7662 7663 if (Invalid) 7664 New->setInvalidDecl(); 7665 7666 if (Attr) 7667 ProcessDeclAttributeList(S, New, Attr); 7668 7669 // If we're declaring or defining a tag in function prototype scope 7670 // in C, note that this type can only be used within the function. 7671 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 7672 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 7673 7674 // Set the lexical context. If the tag has a C++ scope specifier, the 7675 // lexical context will be different from the semantic context. 7676 New->setLexicalDeclContext(CurContext); 7677 7678 // Mark this as a friend decl if applicable. 7679 // In Microsoft mode, a friend declaration also acts as a forward 7680 // declaration so we always pass true to setObjectOfFriendDecl to make 7681 // the tag name visible. 7682 if (TUK == TUK_Friend) 7683 New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ !Previous.empty() || 7684 getLangOptions().Microsoft); 7685 7686 // Set the access specifier. 7687 if (!Invalid && SearchDC->isRecord()) 7688 SetMemberAccessSpecifier(New, PrevDecl, AS); 7689 7690 if (TUK == TUK_Definition) 7691 New->startDefinition(); 7692 7693 // If this has an identifier, add it to the scope stack. 7694 if (TUK == TUK_Friend) { 7695 // We might be replacing an existing declaration in the lookup tables; 7696 // if so, borrow its access specifier. 7697 if (PrevDecl) 7698 New->setAccess(PrevDecl->getAccess()); 7699 7700 DeclContext *DC = New->getDeclContext()->getRedeclContext(); 7701 DC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 7702 if (Name) // can be null along some error paths 7703 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 7704 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false); 7705 } else if (Name) { 7706 S = getNonFieldDeclScope(S); 7707 PushOnScopeChains(New, S, !IsForwardReference); 7708 if (IsForwardReference) 7709 SearchDC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 7710 7711 } else { 7712 CurContext->addDecl(New); 7713 } 7714 7715 // If this is the C FILE type, notify the AST context. 7716 if (IdentifierInfo *II = New->getIdentifier()) 7717 if (!New->isInvalidDecl() && 7718 New->getDeclContext()->getRedeclContext()->isTranslationUnit() && 7719 II->isStr("FILE")) 7720 Context.setFILEDecl(New); 7721 7722 OwnedDecl = true; 7723 return New; 7724} 7725 7726void Sema::ActOnTagStartDefinition(Scope *S, Decl *TagD) { 7727 AdjustDeclIfTemplate(TagD); 7728 TagDecl *Tag = cast<TagDecl>(TagD); 7729 7730 // Enter the tag context. 7731 PushDeclContext(S, Tag); 7732} 7733 7734void Sema::ActOnStartCXXMemberDeclarations(Scope *S, Decl *TagD, 7735 SourceLocation FinalLoc, 7736 SourceLocation LBraceLoc) { 7737 AdjustDeclIfTemplate(TagD); 7738 CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD); 7739 7740 FieldCollector->StartClass(); 7741 7742 if (!Record->getIdentifier()) 7743 return; 7744 7745 if (FinalLoc.isValid()) 7746 Record->addAttr(new (Context) FinalAttr(FinalLoc, Context)); 7747 7748 // C++ [class]p2: 7749 // [...] The class-name is also inserted into the scope of the 7750 // class itself; this is known as the injected-class-name. For 7751 // purposes of access checking, the injected-class-name is treated 7752 // as if it were a public member name. 7753 CXXRecordDecl *InjectedClassName 7754 = CXXRecordDecl::Create(Context, Record->getTagKind(), CurContext, 7755 Record->getLocStart(), Record->getLocation(), 7756 Record->getIdentifier(), 7757 /*PrevDecl=*/0, 7758 /*DelayTypeCreation=*/true); 7759 Context.getTypeDeclType(InjectedClassName, Record); 7760 InjectedClassName->setImplicit(); 7761 InjectedClassName->setAccess(AS_public); 7762 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 7763 InjectedClassName->setDescribedClassTemplate(Template); 7764 PushOnScopeChains(InjectedClassName, S); 7765 assert(InjectedClassName->isInjectedClassName() && 7766 "Broken injected-class-name"); 7767} 7768 7769void Sema::ActOnTagFinishDefinition(Scope *S, Decl *TagD, 7770 SourceLocation RBraceLoc) { 7771 AdjustDeclIfTemplate(TagD); 7772 TagDecl *Tag = cast<TagDecl>(TagD); 7773 Tag->setRBraceLoc(RBraceLoc); 7774 7775 if (isa<CXXRecordDecl>(Tag)) 7776 FieldCollector->FinishClass(); 7777 7778 // Exit this scope of this tag's definition. 7779 PopDeclContext(); 7780 7781 // Notify the consumer that we've defined a tag. 7782 Consumer.HandleTagDeclDefinition(Tag); 7783} 7784 7785void Sema::ActOnTagDefinitionError(Scope *S, Decl *TagD) { 7786 AdjustDeclIfTemplate(TagD); 7787 TagDecl *Tag = cast<TagDecl>(TagD); 7788 Tag->setInvalidDecl(); 7789 7790 // We're undoing ActOnTagStartDefinition here, not 7791 // ActOnStartCXXMemberDeclarations, so we don't have to mess with 7792 // the FieldCollector. 7793 7794 PopDeclContext(); 7795} 7796 7797// Note that FieldName may be null for anonymous bitfields. 7798bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName, 7799 QualType FieldTy, const Expr *BitWidth, 7800 bool *ZeroWidth) { 7801 // Default to true; that shouldn't confuse checks for emptiness 7802 if (ZeroWidth) 7803 *ZeroWidth = true; 7804 7805 // C99 6.7.2.1p4 - verify the field type. 7806 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 7807 if (!FieldTy->isDependentType() && !FieldTy->isIntegralOrEnumerationType()) { 7808 // Handle incomplete types with specific error. 7809 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 7810 return true; 7811 if (FieldName) 7812 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 7813 << FieldName << FieldTy << BitWidth->getSourceRange(); 7814 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) 7815 << FieldTy << BitWidth->getSourceRange(); 7816 } else if (DiagnoseUnexpandedParameterPack(const_cast<Expr *>(BitWidth), 7817 UPPC_BitFieldWidth)) 7818 return true; 7819 7820 // If the bit-width is type- or value-dependent, don't try to check 7821 // it now. 7822 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 7823 return false; 7824 7825 llvm::APSInt Value; 7826 if (VerifyIntegerConstantExpression(BitWidth, &Value)) 7827 return true; 7828 7829 if (Value != 0 && ZeroWidth) 7830 *ZeroWidth = false; 7831 7832 // Zero-width bitfield is ok for anonymous field. 7833 if (Value == 0 && FieldName) 7834 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 7835 7836 if (Value.isSigned() && Value.isNegative()) { 7837 if (FieldName) 7838 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 7839 << FieldName << Value.toString(10); 7840 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) 7841 << Value.toString(10); 7842 } 7843 7844 if (!FieldTy->isDependentType()) { 7845 uint64_t TypeSize = Context.getTypeSize(FieldTy); 7846 if (Value.getZExtValue() > TypeSize) { 7847 if (!getLangOptions().CPlusPlus) { 7848 if (FieldName) 7849 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 7850 << FieldName << (unsigned)Value.getZExtValue() 7851 << (unsigned)TypeSize; 7852 7853 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) 7854 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 7855 } 7856 7857 if (FieldName) 7858 Diag(FieldLoc, diag::warn_bitfield_width_exceeds_type_size) 7859 << FieldName << (unsigned)Value.getZExtValue() 7860 << (unsigned)TypeSize; 7861 else 7862 Diag(FieldLoc, diag::warn_anon_bitfield_width_exceeds_type_size) 7863 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 7864 } 7865 } 7866 7867 return false; 7868} 7869 7870/// ActOnField - Each field of a C struct/union is passed into this in order 7871/// to create a FieldDecl object for it. 7872Decl *Sema::ActOnField(Scope *S, Decl *TagD, SourceLocation DeclStart, 7873 Declarator &D, ExprTy *BitfieldWidth) { 7874 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD), 7875 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 7876 /*HasInit=*/false, AS_public); 7877 return Res; 7878} 7879 7880/// HandleField - Analyze a field of a C struct or a C++ data member. 7881/// 7882FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 7883 SourceLocation DeclStart, 7884 Declarator &D, Expr *BitWidth, bool HasInit, 7885 AccessSpecifier AS) { 7886 IdentifierInfo *II = D.getIdentifier(); 7887 SourceLocation Loc = DeclStart; 7888 if (II) Loc = D.getIdentifierLoc(); 7889 7890 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 7891 QualType T = TInfo->getType(); 7892 if (getLangOptions().CPlusPlus) { 7893 CheckExtraCXXDefaultArguments(D); 7894 7895 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 7896 UPPC_DataMemberType)) { 7897 D.setInvalidType(); 7898 T = Context.IntTy; 7899 TInfo = Context.getTrivialTypeSourceInfo(T, Loc); 7900 } 7901 } 7902 7903 DiagnoseFunctionSpecifiers(D); 7904 7905 if (D.getDeclSpec().isThreadSpecified()) 7906 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 7907 if (D.getDeclSpec().isConstexprSpecified()) 7908 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 7909 << 2; 7910 7911 // Check to see if this name was declared as a member previously 7912 LookupResult Previous(*this, II, Loc, LookupMemberName, ForRedeclaration); 7913 LookupName(Previous, S); 7914 assert((Previous.empty() || Previous.isOverloadedResult() || 7915 Previous.isSingleResult()) 7916 && "Lookup of member name should be either overloaded, single or null"); 7917 7918 // If the name is overloaded then get any declaration else get the single result 7919 NamedDecl *PrevDecl = Previous.isOverloadedResult() ? 7920 Previous.getRepresentativeDecl() : Previous.getAsSingle<NamedDecl>(); 7921 7922 if (PrevDecl && PrevDecl->isTemplateParameter()) { 7923 // Maybe we will complain about the shadowed template parameter. 7924 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 7925 // Just pretend that we didn't see the previous declaration. 7926 PrevDecl = 0; 7927 } 7928 7929 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 7930 PrevDecl = 0; 7931 7932 bool Mutable 7933 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable); 7934 SourceLocation TSSL = D.getSourceRange().getBegin(); 7935 FieldDecl *NewFD 7936 = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, HasInit, 7937 TSSL, AS, PrevDecl, &D); 7938 7939 if (NewFD->isInvalidDecl()) 7940 Record->setInvalidDecl(); 7941 7942 if (NewFD->isInvalidDecl() && PrevDecl) { 7943 // Don't introduce NewFD into scope; there's already something 7944 // with the same name in the same scope. 7945 } else if (II) { 7946 PushOnScopeChains(NewFD, S); 7947 } else 7948 Record->addDecl(NewFD); 7949 7950 return NewFD; 7951} 7952 7953/// \brief Build a new FieldDecl and check its well-formedness. 7954/// 7955/// This routine builds a new FieldDecl given the fields name, type, 7956/// record, etc. \p PrevDecl should refer to any previous declaration 7957/// with the same name and in the same scope as the field to be 7958/// created. 7959/// 7960/// \returns a new FieldDecl. 7961/// 7962/// \todo The Declarator argument is a hack. It will be removed once 7963FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 7964 TypeSourceInfo *TInfo, 7965 RecordDecl *Record, SourceLocation Loc, 7966 bool Mutable, Expr *BitWidth, bool HasInit, 7967 SourceLocation TSSL, 7968 AccessSpecifier AS, NamedDecl *PrevDecl, 7969 Declarator *D) { 7970 IdentifierInfo *II = Name.getAsIdentifierInfo(); 7971 bool InvalidDecl = false; 7972 if (D) InvalidDecl = D->isInvalidType(); 7973 7974 // If we receive a broken type, recover by assuming 'int' and 7975 // marking this declaration as invalid. 7976 if (T.isNull()) { 7977 InvalidDecl = true; 7978 T = Context.IntTy; 7979 } 7980 7981 QualType EltTy = Context.getBaseElementType(T); 7982 if (!EltTy->isDependentType() && 7983 RequireCompleteType(Loc, EltTy, diag::err_field_incomplete)) { 7984 // Fields of incomplete type force their record to be invalid. 7985 Record->setInvalidDecl(); 7986 InvalidDecl = true; 7987 } 7988 7989 // C99 6.7.2.1p8: A member of a structure or union may have any type other 7990 // than a variably modified type. 7991 if (!InvalidDecl && T->isVariablyModifiedType()) { 7992 bool SizeIsNegative; 7993 llvm::APSInt Oversized; 7994 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 7995 SizeIsNegative, 7996 Oversized); 7997 if (!FixedTy.isNull()) { 7998 Diag(Loc, diag::warn_illegal_constant_array_size); 7999 T = FixedTy; 8000 } else { 8001 if (SizeIsNegative) 8002 Diag(Loc, diag::err_typecheck_negative_array_size); 8003 else if (Oversized.getBoolValue()) 8004 Diag(Loc, diag::err_array_too_large) 8005 << Oversized.toString(10); 8006 else 8007 Diag(Loc, diag::err_typecheck_field_variable_size); 8008 InvalidDecl = true; 8009 } 8010 } 8011 8012 // Fields can not have abstract class types 8013 if (!InvalidDecl && RequireNonAbstractType(Loc, T, 8014 diag::err_abstract_type_in_decl, 8015 AbstractFieldType)) 8016 InvalidDecl = true; 8017 8018 bool ZeroWidth = false; 8019 // If this is declared as a bit-field, check the bit-field. 8020 if (!InvalidDecl && BitWidth && 8021 VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth)) { 8022 InvalidDecl = true; 8023 BitWidth = 0; 8024 ZeroWidth = false; 8025 } 8026 8027 // Check that 'mutable' is consistent with the type of the declaration. 8028 if (!InvalidDecl && Mutable) { 8029 unsigned DiagID = 0; 8030 if (T->isReferenceType()) 8031 DiagID = diag::err_mutable_reference; 8032 else if (T.isConstQualified()) 8033 DiagID = diag::err_mutable_const; 8034 8035 if (DiagID) { 8036 SourceLocation ErrLoc = Loc; 8037 if (D && D->getDeclSpec().getStorageClassSpecLoc().isValid()) 8038 ErrLoc = D->getDeclSpec().getStorageClassSpecLoc(); 8039 Diag(ErrLoc, DiagID); 8040 Mutable = false; 8041 InvalidDecl = true; 8042 } 8043 } 8044 8045 FieldDecl *NewFD = FieldDecl::Create(Context, Record, TSSL, Loc, II, T, TInfo, 8046 BitWidth, Mutable, HasInit); 8047 if (InvalidDecl) 8048 NewFD->setInvalidDecl(); 8049 8050 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 8051 Diag(Loc, diag::err_duplicate_member) << II; 8052 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 8053 NewFD->setInvalidDecl(); 8054 } 8055 8056 if (!InvalidDecl && getLangOptions().CPlusPlus) { 8057 if (Record->isUnion()) { 8058 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 8059 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 8060 if (RDecl->getDefinition()) { 8061 // C++ [class.union]p1: An object of a class with a non-trivial 8062 // constructor, a non-trivial copy constructor, a non-trivial 8063 // destructor, or a non-trivial copy assignment operator 8064 // cannot be a member of a union, nor can an array of such 8065 // objects. 8066 if (!getLangOptions().CPlusPlus0x && CheckNontrivialField(NewFD)) 8067 NewFD->setInvalidDecl(); 8068 } 8069 } 8070 8071 // C++ [class.union]p1: If a union contains a member of reference type, 8072 // the program is ill-formed. 8073 if (EltTy->isReferenceType()) { 8074 Diag(NewFD->getLocation(), diag::err_union_member_of_reference_type) 8075 << NewFD->getDeclName() << EltTy; 8076 NewFD->setInvalidDecl(); 8077 } 8078 } 8079 } 8080 8081 // FIXME: We need to pass in the attributes given an AST 8082 // representation, not a parser representation. 8083 if (D) 8084 // FIXME: What to pass instead of TUScope? 8085 ProcessDeclAttributes(TUScope, NewFD, *D); 8086 8087 // In auto-retain/release, infer strong retension for fields of 8088 // retainable type. 8089 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewFD)) 8090 NewFD->setInvalidDecl(); 8091 8092 if (T.isObjCGCWeak()) 8093 Diag(Loc, diag::warn_attribute_weak_on_field); 8094 8095 NewFD->setAccess(AS); 8096 return NewFD; 8097} 8098 8099bool Sema::CheckNontrivialField(FieldDecl *FD) { 8100 assert(FD); 8101 assert(getLangOptions().CPlusPlus && "valid check only for C++"); 8102 8103 if (FD->isInvalidDecl()) 8104 return true; 8105 8106 QualType EltTy = Context.getBaseElementType(FD->getType()); 8107 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 8108 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 8109 if (RDecl->getDefinition()) { 8110 // We check for copy constructors before constructors 8111 // because otherwise we'll never get complaints about 8112 // copy constructors. 8113 8114 CXXSpecialMember member = CXXInvalid; 8115 if (!RDecl->hasTrivialCopyConstructor()) 8116 member = CXXCopyConstructor; 8117 else if (!RDecl->hasTrivialDefaultConstructor()) 8118 member = CXXDefaultConstructor; 8119 else if (!RDecl->hasTrivialCopyAssignment()) 8120 member = CXXCopyAssignment; 8121 else if (!RDecl->hasTrivialDestructor()) 8122 member = CXXDestructor; 8123 8124 if (member != CXXInvalid) { 8125 if (getLangOptions().ObjCAutoRefCount && RDecl->hasObjectMember()) { 8126 // Objective-C++ ARC: it is an error to have a non-trivial field of 8127 // a union. However, system headers in Objective-C programs 8128 // occasionally have Objective-C lifetime objects within unions, 8129 // and rather than cause the program to fail, we make those 8130 // members unavailable. 8131 SourceLocation Loc = FD->getLocation(); 8132 if (getSourceManager().isInSystemHeader(Loc)) { 8133 if (!FD->hasAttr<UnavailableAttr>()) 8134 FD->addAttr(new (Context) UnavailableAttr(Loc, Context, 8135 "this system field has retaining ownership")); 8136 return false; 8137 } 8138 } 8139 8140 Diag(FD->getLocation(), diag::err_illegal_union_or_anon_struct_member) 8141 << (int)FD->getParent()->isUnion() << FD->getDeclName() << member; 8142 DiagnoseNontrivial(RT, member); 8143 return true; 8144 } 8145 } 8146 } 8147 8148 return false; 8149} 8150 8151/// DiagnoseNontrivial - Given that a class has a non-trivial 8152/// special member, figure out why. 8153void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) { 8154 QualType QT(T, 0U); 8155 CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl()); 8156 8157 // Check whether the member was user-declared. 8158 switch (member) { 8159 case CXXInvalid: 8160 break; 8161 8162 case CXXDefaultConstructor: 8163 if (RD->hasUserDeclaredConstructor()) { 8164 typedef CXXRecordDecl::ctor_iterator ctor_iter; 8165 for (ctor_iter ci = RD->ctor_begin(), ce = RD->ctor_end(); ci != ce;++ci){ 8166 const FunctionDecl *body = 0; 8167 ci->hasBody(body); 8168 if (!body || !cast<CXXConstructorDecl>(body)->isImplicitlyDefined()) { 8169 SourceLocation CtorLoc = ci->getLocation(); 8170 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8171 return; 8172 } 8173 } 8174 8175 assert(0 && "found no user-declared constructors"); 8176 return; 8177 } 8178 break; 8179 8180 case CXXCopyConstructor: 8181 if (RD->hasUserDeclaredCopyConstructor()) { 8182 SourceLocation CtorLoc = 8183 RD->getCopyConstructor(0)->getLocation(); 8184 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8185 return; 8186 } 8187 break; 8188 8189 case CXXMoveConstructor: 8190 if (RD->hasUserDeclaredMoveConstructor()) { 8191 SourceLocation CtorLoc = RD->getMoveConstructor()->getLocation(); 8192 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8193 return; 8194 } 8195 break; 8196 8197 case CXXCopyAssignment: 8198 if (RD->hasUserDeclaredCopyAssignment()) { 8199 // FIXME: this should use the location of the copy 8200 // assignment, not the type. 8201 SourceLocation TyLoc = RD->getSourceRange().getBegin(); 8202 Diag(TyLoc, diag::note_nontrivial_user_defined) << QT << member; 8203 return; 8204 } 8205 break; 8206 8207 case CXXMoveAssignment: 8208 if (RD->hasUserDeclaredMoveAssignment()) { 8209 SourceLocation AssignLoc = RD->getMoveAssignmentOperator()->getLocation(); 8210 Diag(AssignLoc, diag::note_nontrivial_user_defined) << QT << member; 8211 return; 8212 } 8213 break; 8214 8215 case CXXDestructor: 8216 if (RD->hasUserDeclaredDestructor()) { 8217 SourceLocation DtorLoc = LookupDestructor(RD)->getLocation(); 8218 Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8219 return; 8220 } 8221 break; 8222 } 8223 8224 typedef CXXRecordDecl::base_class_iterator base_iter; 8225 8226 // Virtual bases and members inhibit trivial copying/construction, 8227 // but not trivial destruction. 8228 if (member != CXXDestructor) { 8229 // Check for virtual bases. vbases includes indirect virtual bases, 8230 // so we just iterate through the direct bases. 8231 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) 8232 if (bi->isVirtual()) { 8233 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 8234 Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1; 8235 return; 8236 } 8237 8238 // Check for virtual methods. 8239 typedef CXXRecordDecl::method_iterator meth_iter; 8240 for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me; 8241 ++mi) { 8242 if (mi->isVirtual()) { 8243 SourceLocation MLoc = mi->getSourceRange().getBegin(); 8244 Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0; 8245 return; 8246 } 8247 } 8248 } 8249 8250 bool (CXXRecordDecl::*hasTrivial)() const; 8251 switch (member) { 8252 case CXXDefaultConstructor: 8253 hasTrivial = &CXXRecordDecl::hasTrivialDefaultConstructor; break; 8254 case CXXCopyConstructor: 8255 hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break; 8256 case CXXCopyAssignment: 8257 hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break; 8258 case CXXDestructor: 8259 hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break; 8260 default: 8261 assert(0 && "unexpected special member"); return; 8262 } 8263 8264 // Check for nontrivial bases (and recurse). 8265 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) { 8266 const RecordType *BaseRT = bi->getType()->getAs<RecordType>(); 8267 assert(BaseRT && "Don't know how to handle dependent bases"); 8268 CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl()); 8269 if (!(BaseRecTy->*hasTrivial)()) { 8270 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 8271 Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member; 8272 DiagnoseNontrivial(BaseRT, member); 8273 return; 8274 } 8275 } 8276 8277 // Check for nontrivial members (and recurse). 8278 typedef RecordDecl::field_iterator field_iter; 8279 for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe; 8280 ++fi) { 8281 QualType EltTy = Context.getBaseElementType((*fi)->getType()); 8282 if (const RecordType *EltRT = EltTy->getAs<RecordType>()) { 8283 CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl()); 8284 8285 if (!(EltRD->*hasTrivial)()) { 8286 SourceLocation FLoc = (*fi)->getLocation(); 8287 Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member; 8288 DiagnoseNontrivial(EltRT, member); 8289 return; 8290 } 8291 } 8292 8293 if (EltTy->isObjCLifetimeType()) { 8294 switch (EltTy.getObjCLifetime()) { 8295 case Qualifiers::OCL_None: 8296 case Qualifiers::OCL_ExplicitNone: 8297 break; 8298 8299 case Qualifiers::OCL_Autoreleasing: 8300 case Qualifiers::OCL_Weak: 8301 case Qualifiers::OCL_Strong: 8302 Diag((*fi)->getLocation(), diag::note_nontrivial_objc_ownership) 8303 << QT << EltTy.getObjCLifetime(); 8304 return; 8305 } 8306 } 8307 } 8308 8309 assert(0 && "found no explanation for non-trivial member"); 8310} 8311 8312/// TranslateIvarVisibility - Translate visibility from a token ID to an 8313/// AST enum value. 8314static ObjCIvarDecl::AccessControl 8315TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 8316 switch (ivarVisibility) { 8317 default: assert(0 && "Unknown visitibility kind"); 8318 case tok::objc_private: return ObjCIvarDecl::Private; 8319 case tok::objc_public: return ObjCIvarDecl::Public; 8320 case tok::objc_protected: return ObjCIvarDecl::Protected; 8321 case tok::objc_package: return ObjCIvarDecl::Package; 8322 } 8323} 8324 8325/// ActOnIvar - Each ivar field of an objective-c class is passed into this 8326/// in order to create an IvarDecl object for it. 8327Decl *Sema::ActOnIvar(Scope *S, 8328 SourceLocation DeclStart, 8329 Decl *IntfDecl, 8330 Declarator &D, ExprTy *BitfieldWidth, 8331 tok::ObjCKeywordKind Visibility) { 8332 8333 IdentifierInfo *II = D.getIdentifier(); 8334 Expr *BitWidth = (Expr*)BitfieldWidth; 8335 SourceLocation Loc = DeclStart; 8336 if (II) Loc = D.getIdentifierLoc(); 8337 8338 // FIXME: Unnamed fields can be handled in various different ways, for 8339 // example, unnamed unions inject all members into the struct namespace! 8340 8341 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8342 QualType T = TInfo->getType(); 8343 8344 if (BitWidth) { 8345 // 6.7.2.1p3, 6.7.2.1p4 8346 if (VerifyBitField(Loc, II, T, BitWidth)) { 8347 D.setInvalidType(); 8348 BitWidth = 0; 8349 } 8350 } else { 8351 // Not a bitfield. 8352 8353 // validate II. 8354 8355 } 8356 if (T->isReferenceType()) { 8357 Diag(Loc, diag::err_ivar_reference_type); 8358 D.setInvalidType(); 8359 } 8360 // C99 6.7.2.1p8: A member of a structure or union may have any type other 8361 // than a variably modified type. 8362 else if (T->isVariablyModifiedType()) { 8363 Diag(Loc, diag::err_typecheck_ivar_variable_size); 8364 D.setInvalidType(); 8365 } 8366 8367 // Get the visibility (access control) for this ivar. 8368 ObjCIvarDecl::AccessControl ac = 8369 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 8370 : ObjCIvarDecl::None; 8371 // Must set ivar's DeclContext to its enclosing interface. 8372 ObjCContainerDecl *EnclosingDecl = cast<ObjCContainerDecl>(IntfDecl); 8373 ObjCContainerDecl *EnclosingContext; 8374 if (ObjCImplementationDecl *IMPDecl = 8375 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 8376 if (!LangOpts.ObjCNonFragileABI2) { 8377 // Case of ivar declared in an implementation. Context is that of its class. 8378 EnclosingContext = IMPDecl->getClassInterface(); 8379 assert(EnclosingContext && "Implementation has no class interface!"); 8380 } 8381 else 8382 EnclosingContext = EnclosingDecl; 8383 } else { 8384 if (ObjCCategoryDecl *CDecl = 8385 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 8386 if (!LangOpts.ObjCNonFragileABI2 || !CDecl->IsClassExtension()) { 8387 Diag(Loc, diag::err_misplaced_ivar) << CDecl->IsClassExtension(); 8388 return 0; 8389 } 8390 } 8391 EnclosingContext = EnclosingDecl; 8392 } 8393 8394 // Construct the decl. 8395 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, EnclosingContext, 8396 DeclStart, Loc, II, T, 8397 TInfo, ac, (Expr *)BitfieldWidth); 8398 8399 if (II) { 8400 NamedDecl *PrevDecl = LookupSingleName(S, II, Loc, LookupMemberName, 8401 ForRedeclaration); 8402 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S) 8403 && !isa<TagDecl>(PrevDecl)) { 8404 Diag(Loc, diag::err_duplicate_member) << II; 8405 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 8406 NewID->setInvalidDecl(); 8407 } 8408 } 8409 8410 // Process attributes attached to the ivar. 8411 ProcessDeclAttributes(S, NewID, D); 8412 8413 if (D.isInvalidType()) 8414 NewID->setInvalidDecl(); 8415 8416 // In ARC, infer 'retaining' for ivars of retainable type. 8417 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewID)) 8418 NewID->setInvalidDecl(); 8419 8420 if (II) { 8421 // FIXME: When interfaces are DeclContexts, we'll need to add 8422 // these to the interface. 8423 S->AddDecl(NewID); 8424 IdResolver.AddDecl(NewID); 8425 } 8426 8427 return NewID; 8428} 8429 8430/// ActOnLastBitfield - This routine handles synthesized bitfields rules for 8431/// class and class extensions. For every class @interface and class 8432/// extension @interface, if the last ivar is a bitfield of any type, 8433/// then add an implicit `char :0` ivar to the end of that interface. 8434void Sema::ActOnLastBitfield(SourceLocation DeclLoc, Decl *EnclosingDecl, 8435 SmallVectorImpl<Decl *> &AllIvarDecls) { 8436 if (!LangOpts.ObjCNonFragileABI2 || AllIvarDecls.empty()) 8437 return; 8438 8439 Decl *ivarDecl = AllIvarDecls[AllIvarDecls.size()-1]; 8440 ObjCIvarDecl *Ivar = cast<ObjCIvarDecl>(ivarDecl); 8441 8442 if (!Ivar->isBitField()) 8443 return; 8444 uint64_t BitFieldSize = 8445 Ivar->getBitWidth()->EvaluateAsInt(Context).getZExtValue(); 8446 if (BitFieldSize == 0) 8447 return; 8448 ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl); 8449 if (!ID) { 8450 if (ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 8451 if (!CD->IsClassExtension()) 8452 return; 8453 } 8454 // No need to add this to end of @implementation. 8455 else 8456 return; 8457 } 8458 // All conditions are met. Add a new bitfield to the tail end of ivars. 8459 llvm::APInt Zero(Context.getTypeSize(Context.IntTy), 0); 8460 Expr * BW = IntegerLiteral::Create(Context, Zero, Context.IntTy, DeclLoc); 8461 8462 Ivar = ObjCIvarDecl::Create(Context, cast<ObjCContainerDecl>(EnclosingDecl), 8463 DeclLoc, DeclLoc, 0, 8464 Context.CharTy, 8465 Context.getTrivialTypeSourceInfo(Context.CharTy, 8466 DeclLoc), 8467 ObjCIvarDecl::Private, BW, 8468 true); 8469 AllIvarDecls.push_back(Ivar); 8470} 8471 8472void Sema::ActOnFields(Scope* S, 8473 SourceLocation RecLoc, Decl *EnclosingDecl, 8474 Decl **Fields, unsigned NumFields, 8475 SourceLocation LBrac, SourceLocation RBrac, 8476 AttributeList *Attr) { 8477 assert(EnclosingDecl && "missing record or interface decl"); 8478 8479 // If the decl this is being inserted into is invalid, then it may be a 8480 // redeclaration or some other bogus case. Don't try to add fields to it. 8481 if (EnclosingDecl->isInvalidDecl()) { 8482 // FIXME: Deallocate fields? 8483 return; 8484 } 8485 8486 8487 // Verify that all the fields are okay. 8488 unsigned NumNamedMembers = 0; 8489 SmallVector<FieldDecl*, 32> RecFields; 8490 8491 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 8492 bool ARCErrReported = false; 8493 for (unsigned i = 0; i != NumFields; ++i) { 8494 FieldDecl *FD = cast<FieldDecl>(Fields[i]); 8495 8496 // Get the type for the field. 8497 const Type *FDTy = FD->getType().getTypePtr(); 8498 8499 if (!FD->isAnonymousStructOrUnion()) { 8500 // Remember all fields written by the user. 8501 RecFields.push_back(FD); 8502 } 8503 8504 // If the field is already invalid for some reason, don't emit more 8505 // diagnostics about it. 8506 if (FD->isInvalidDecl()) { 8507 EnclosingDecl->setInvalidDecl(); 8508 continue; 8509 } 8510 8511 // C99 6.7.2.1p2: 8512 // A structure or union shall not contain a member with 8513 // incomplete or function type (hence, a structure shall not 8514 // contain an instance of itself, but may contain a pointer to 8515 // an instance of itself), except that the last member of a 8516 // structure with more than one named member may have incomplete 8517 // array type; such a structure (and any union containing, 8518 // possibly recursively, a member that is such a structure) 8519 // shall not be a member of a structure or an element of an 8520 // array. 8521 if (FDTy->isFunctionType()) { 8522 // Field declared as a function. 8523 Diag(FD->getLocation(), diag::err_field_declared_as_function) 8524 << FD->getDeclName(); 8525 FD->setInvalidDecl(); 8526 EnclosingDecl->setInvalidDecl(); 8527 continue; 8528 } else if (FDTy->isIncompleteArrayType() && Record && 8529 ((i == NumFields - 1 && !Record->isUnion()) || 8530 ((getLangOptions().Microsoft || getLangOptions().CPlusPlus) && 8531 (i == NumFields - 1 || Record->isUnion())))) { 8532 // Flexible array member. 8533 // Microsoft and g++ is more permissive regarding flexible array. 8534 // It will accept flexible array in union and also 8535 // as the sole element of a struct/class. 8536 if (getLangOptions().Microsoft) { 8537 if (Record->isUnion()) 8538 Diag(FD->getLocation(), diag::ext_flexible_array_union_ms) 8539 << FD->getDeclName(); 8540 else if (NumFields == 1) 8541 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_ms) 8542 << FD->getDeclName() << Record->getTagKind(); 8543 } else if (getLangOptions().CPlusPlus) { 8544 if (Record->isUnion()) 8545 Diag(FD->getLocation(), diag::ext_flexible_array_union_gnu) 8546 << FD->getDeclName(); 8547 else if (NumFields == 1) 8548 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_gnu) 8549 << FD->getDeclName() << Record->getTagKind(); 8550 } else if (NumNamedMembers < 1) { 8551 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 8552 << FD->getDeclName(); 8553 FD->setInvalidDecl(); 8554 EnclosingDecl->setInvalidDecl(); 8555 continue; 8556 } 8557 if (!FD->getType()->isDependentType() && 8558 !Context.getBaseElementType(FD->getType()).isPODType(Context)) { 8559 Diag(FD->getLocation(), diag::err_flexible_array_has_nonpod_type) 8560 << FD->getDeclName() << FD->getType(); 8561 FD->setInvalidDecl(); 8562 EnclosingDecl->setInvalidDecl(); 8563 continue; 8564 } 8565 // Okay, we have a legal flexible array member at the end of the struct. 8566 if (Record) 8567 Record->setHasFlexibleArrayMember(true); 8568 } else if (!FDTy->isDependentType() && 8569 RequireCompleteType(FD->getLocation(), FD->getType(), 8570 diag::err_field_incomplete)) { 8571 // Incomplete type 8572 FD->setInvalidDecl(); 8573 EnclosingDecl->setInvalidDecl(); 8574 continue; 8575 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) { 8576 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 8577 // If this is a member of a union, then entire union becomes "flexible". 8578 if (Record && Record->isUnion()) { 8579 Record->setHasFlexibleArrayMember(true); 8580 } else { 8581 // If this is a struct/class and this is not the last element, reject 8582 // it. Note that GCC supports variable sized arrays in the middle of 8583 // structures. 8584 if (i != NumFields-1) 8585 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 8586 << FD->getDeclName() << FD->getType(); 8587 else { 8588 // We support flexible arrays at the end of structs in 8589 // other structs as an extension. 8590 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 8591 << FD->getDeclName(); 8592 if (Record) 8593 Record->setHasFlexibleArrayMember(true); 8594 } 8595 } 8596 } 8597 if (Record && FDTTy->getDecl()->hasObjectMember()) 8598 Record->setHasObjectMember(true); 8599 } else if (FDTy->isObjCObjectType()) { 8600 /// A field cannot be an Objective-c object 8601 Diag(FD->getLocation(), diag::err_statically_allocated_object) 8602 << FixItHint::CreateInsertion(FD->getLocation(), "*"); 8603 QualType T = Context.getObjCObjectPointerType(FD->getType()); 8604 FD->setType(T); 8605 } 8606 else if (!getLangOptions().CPlusPlus) { 8607 if (getLangOptions().ObjCAutoRefCount && Record && !ARCErrReported) { 8608 // It's an error in ARC if a field has lifetime. 8609 // We don't want to report this in a system header, though, 8610 // so we just make the field unavailable. 8611 // FIXME: that's really not sufficient; we need to make the type 8612 // itself invalid to, say, initialize or copy. 8613 QualType T = FD->getType(); 8614 Qualifiers::ObjCLifetime lifetime = T.getObjCLifetime(); 8615 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone) { 8616 SourceLocation loc = FD->getLocation(); 8617 if (getSourceManager().isInSystemHeader(loc)) { 8618 if (!FD->hasAttr<UnavailableAttr>()) { 8619 FD->addAttr(new (Context) UnavailableAttr(loc, Context, 8620 "this system field has retaining ownership")); 8621 } 8622 } else { 8623 Diag(FD->getLocation(), diag::err_arc_objc_object_in_struct); 8624 } 8625 ARCErrReported = true; 8626 } 8627 } 8628 else if (getLangOptions().ObjC1 && 8629 getLangOptions().getGCMode() != LangOptions::NonGC && 8630 Record && !Record->hasObjectMember()) { 8631 if (FD->getType()->isObjCObjectPointerType() || 8632 FD->getType().isObjCGCStrong()) 8633 Record->setHasObjectMember(true); 8634 else if (Context.getAsArrayType(FD->getType())) { 8635 QualType BaseType = Context.getBaseElementType(FD->getType()); 8636 if (BaseType->isRecordType() && 8637 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()) 8638 Record->setHasObjectMember(true); 8639 else if (BaseType->isObjCObjectPointerType() || 8640 BaseType.isObjCGCStrong()) 8641 Record->setHasObjectMember(true); 8642 } 8643 } 8644 } 8645 // Keep track of the number of named members. 8646 if (FD->getIdentifier()) 8647 ++NumNamedMembers; 8648 } 8649 8650 // Okay, we successfully defined 'Record'. 8651 if (Record) { 8652 bool Completed = false; 8653 if (CXXRecordDecl *CXXRecord = dyn_cast<CXXRecordDecl>(Record)) { 8654 if (!CXXRecord->isInvalidDecl()) { 8655 // Set access bits correctly on the directly-declared conversions. 8656 UnresolvedSetImpl *Convs = CXXRecord->getConversionFunctions(); 8657 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); 8658 I != E; ++I) 8659 Convs->setAccess(I, (*I)->getAccess()); 8660 8661 if (!CXXRecord->isDependentType()) { 8662 // Objective-C Automatic Reference Counting: 8663 // If a class has a non-static data member of Objective-C pointer 8664 // type (or array thereof), it is a non-POD type and its 8665 // default constructor (if any), copy constructor, copy assignment 8666 // operator, and destructor are non-trivial. 8667 // 8668 // This rule is also handled by CXXRecordDecl::completeDefinition(). 8669 // However, here we check whether this particular class is only 8670 // non-POD because of the presence of an Objective-C pointer member. 8671 // If so, objects of this type cannot be shared between code compiled 8672 // with instant objects and code compiled with manual retain/release. 8673 if (getLangOptions().ObjCAutoRefCount && 8674 CXXRecord->hasObjectMember() && 8675 CXXRecord->getLinkage() == ExternalLinkage) { 8676 if (CXXRecord->isPOD()) { 8677 Diag(CXXRecord->getLocation(), 8678 diag::warn_arc_non_pod_class_with_object_member) 8679 << CXXRecord; 8680 } else { 8681 // FIXME: Fix-Its would be nice here, but finding a good location 8682 // for them is going to be tricky. 8683 if (CXXRecord->hasTrivialCopyConstructor()) 8684 Diag(CXXRecord->getLocation(), 8685 diag::warn_arc_trivial_member_function_with_object_member) 8686 << CXXRecord << 0; 8687 if (CXXRecord->hasTrivialCopyAssignment()) 8688 Diag(CXXRecord->getLocation(), 8689 diag::warn_arc_trivial_member_function_with_object_member) 8690 << CXXRecord << 1; 8691 if (CXXRecord->hasTrivialDestructor()) 8692 Diag(CXXRecord->getLocation(), 8693 diag::warn_arc_trivial_member_function_with_object_member) 8694 << CXXRecord << 2; 8695 } 8696 } 8697 8698 // Adjust user-defined destructor exception spec. 8699 if (getLangOptions().CPlusPlus0x && 8700 CXXRecord->hasUserDeclaredDestructor()) 8701 AdjustDestructorExceptionSpec(CXXRecord,CXXRecord->getDestructor()); 8702 8703 // Add any implicitly-declared members to this class. 8704 AddImplicitlyDeclaredMembersToClass(CXXRecord); 8705 8706 // If we have virtual base classes, we may end up finding multiple 8707 // final overriders for a given virtual function. Check for this 8708 // problem now. 8709 if (CXXRecord->getNumVBases()) { 8710 CXXFinalOverriderMap FinalOverriders; 8711 CXXRecord->getFinalOverriders(FinalOverriders); 8712 8713 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 8714 MEnd = FinalOverriders.end(); 8715 M != MEnd; ++M) { 8716 for (OverridingMethods::iterator SO = M->second.begin(), 8717 SOEnd = M->second.end(); 8718 SO != SOEnd; ++SO) { 8719 assert(SO->second.size() > 0 && 8720 "Virtual function without overridding functions?"); 8721 if (SO->second.size() == 1) 8722 continue; 8723 8724 // C++ [class.virtual]p2: 8725 // In a derived class, if a virtual member function of a base 8726 // class subobject has more than one final overrider the 8727 // program is ill-formed. 8728 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 8729 << (NamedDecl *)M->first << Record; 8730 Diag(M->first->getLocation(), 8731 diag::note_overridden_virtual_function); 8732 for (OverridingMethods::overriding_iterator 8733 OM = SO->second.begin(), 8734 OMEnd = SO->second.end(); 8735 OM != OMEnd; ++OM) 8736 Diag(OM->Method->getLocation(), diag::note_final_overrider) 8737 << (NamedDecl *)M->first << OM->Method->getParent(); 8738 8739 Record->setInvalidDecl(); 8740 } 8741 } 8742 CXXRecord->completeDefinition(&FinalOverriders); 8743 Completed = true; 8744 } 8745 } 8746 } 8747 } 8748 8749 if (!Completed) 8750 Record->completeDefinition(); 8751 8752 // Now that the record is complete, do any delayed exception spec checks 8753 // we were missing. 8754 while (!DelayedDestructorExceptionSpecChecks.empty()) { 8755 const CXXDestructorDecl *Dtor = 8756 DelayedDestructorExceptionSpecChecks.back().first; 8757 if (Dtor->getParent() != Record) 8758 break; 8759 8760 assert(!Dtor->getParent()->isDependentType() && 8761 "Should not ever add destructors of templates into the list."); 8762 CheckOverridingFunctionExceptionSpec(Dtor, 8763 DelayedDestructorExceptionSpecChecks.back().second); 8764 DelayedDestructorExceptionSpecChecks.pop_back(); 8765 } 8766 8767 } else { 8768 ObjCIvarDecl **ClsFields = 8769 reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); 8770 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 8771 ID->setLocEnd(RBrac); 8772 // Add ivar's to class's DeclContext. 8773 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 8774 ClsFields[i]->setLexicalDeclContext(ID); 8775 ID->addDecl(ClsFields[i]); 8776 } 8777 // Must enforce the rule that ivars in the base classes may not be 8778 // duplicates. 8779 if (ID->getSuperClass()) 8780 DiagnoseDuplicateIvars(ID, ID->getSuperClass()); 8781 } else if (ObjCImplementationDecl *IMPDecl = 8782 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 8783 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 8784 for (unsigned I = 0, N = RecFields.size(); I != N; ++I) 8785 // Ivar declared in @implementation never belongs to the implementation. 8786 // Only it is in implementation's lexical context. 8787 ClsFields[I]->setLexicalDeclContext(IMPDecl); 8788 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 8789 } else if (ObjCCategoryDecl *CDecl = 8790 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 8791 // case of ivars in class extension; all other cases have been 8792 // reported as errors elsewhere. 8793 // FIXME. Class extension does not have a LocEnd field. 8794 // CDecl->setLocEnd(RBrac); 8795 // Add ivar's to class extension's DeclContext. 8796 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 8797 ClsFields[i]->setLexicalDeclContext(CDecl); 8798 CDecl->addDecl(ClsFields[i]); 8799 } 8800 } 8801 } 8802 8803 if (Attr) 8804 ProcessDeclAttributeList(S, Record, Attr); 8805 8806 // If there's a #pragma GCC visibility in scope, and this isn't a subclass, 8807 // set the visibility of this record. 8808 if (Record && !Record->getDeclContext()->isRecord()) 8809 AddPushedVisibilityAttribute(Record); 8810} 8811 8812/// \brief Determine whether the given integral value is representable within 8813/// the given type T. 8814static bool isRepresentableIntegerValue(ASTContext &Context, 8815 llvm::APSInt &Value, 8816 QualType T) { 8817 assert(T->isIntegralType(Context) && "Integral type required!"); 8818 unsigned BitWidth = Context.getIntWidth(T); 8819 8820 if (Value.isUnsigned() || Value.isNonNegative()) { 8821 if (T->isSignedIntegerOrEnumerationType()) 8822 --BitWidth; 8823 return Value.getActiveBits() <= BitWidth; 8824 } 8825 return Value.getMinSignedBits() <= BitWidth; 8826} 8827 8828// \brief Given an integral type, return the next larger integral type 8829// (or a NULL type of no such type exists). 8830static QualType getNextLargerIntegralType(ASTContext &Context, QualType T) { 8831 // FIXME: Int128/UInt128 support, which also needs to be introduced into 8832 // enum checking below. 8833 assert(T->isIntegralType(Context) && "Integral type required!"); 8834 const unsigned NumTypes = 4; 8835 QualType SignedIntegralTypes[NumTypes] = { 8836 Context.ShortTy, Context.IntTy, Context.LongTy, Context.LongLongTy 8837 }; 8838 QualType UnsignedIntegralTypes[NumTypes] = { 8839 Context.UnsignedShortTy, Context.UnsignedIntTy, Context.UnsignedLongTy, 8840 Context.UnsignedLongLongTy 8841 }; 8842 8843 unsigned BitWidth = Context.getTypeSize(T); 8844 QualType *Types = T->isSignedIntegerOrEnumerationType()? SignedIntegralTypes 8845 : UnsignedIntegralTypes; 8846 for (unsigned I = 0; I != NumTypes; ++I) 8847 if (Context.getTypeSize(Types[I]) > BitWidth) 8848 return Types[I]; 8849 8850 return QualType(); 8851} 8852 8853EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 8854 EnumConstantDecl *LastEnumConst, 8855 SourceLocation IdLoc, 8856 IdentifierInfo *Id, 8857 Expr *Val) { 8858 unsigned IntWidth = Context.Target.getIntWidth(); 8859 llvm::APSInt EnumVal(IntWidth); 8860 QualType EltTy; 8861 8862 if (Val && DiagnoseUnexpandedParameterPack(Val, UPPC_EnumeratorValue)) 8863 Val = 0; 8864 8865 if (Val) { 8866 if (Enum->isDependentType() || Val->isTypeDependent()) 8867 EltTy = Context.DependentTy; 8868 else { 8869 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 8870 SourceLocation ExpLoc; 8871 if (!Val->isValueDependent() && 8872 VerifyIntegerConstantExpression(Val, &EnumVal)) { 8873 Val = 0; 8874 } else { 8875 if (!getLangOptions().CPlusPlus) { 8876 // C99 6.7.2.2p2: 8877 // The expression that defines the value of an enumeration constant 8878 // shall be an integer constant expression that has a value 8879 // representable as an int. 8880 8881 // Complain if the value is not representable in an int. 8882 if (!isRepresentableIntegerValue(Context, EnumVal, Context.IntTy)) 8883 Diag(IdLoc, diag::ext_enum_value_not_int) 8884 << EnumVal.toString(10) << Val->getSourceRange() 8885 << (EnumVal.isUnsigned() || EnumVal.isNonNegative()); 8886 else if (!Context.hasSameType(Val->getType(), Context.IntTy)) { 8887 // Force the type of the expression to 'int'. 8888 Val = ImpCastExprToType(Val, Context.IntTy, CK_IntegralCast).take(); 8889 } 8890 } 8891 8892 if (Enum->isFixed()) { 8893 EltTy = Enum->getIntegerType(); 8894 8895 // C++0x [dcl.enum]p5: 8896 // ... if the initializing value of an enumerator cannot be 8897 // represented by the underlying type, the program is ill-formed. 8898 if (!isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 8899 if (getLangOptions().Microsoft) { 8900 Diag(IdLoc, diag::ext_enumerator_too_large) << EltTy; 8901 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 8902 } else 8903 Diag(IdLoc, diag::err_enumerator_too_large) 8904 << EltTy; 8905 } else 8906 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 8907 } 8908 else { 8909 // C++0x [dcl.enum]p5: 8910 // If the underlying type is not fixed, the type of each enumerator 8911 // is the type of its initializing value: 8912 // - If an initializer is specified for an enumerator, the 8913 // initializing value has the same type as the expression. 8914 EltTy = Val->getType(); 8915 } 8916 } 8917 } 8918 } 8919 8920 if (!Val) { 8921 if (Enum->isDependentType()) 8922 EltTy = Context.DependentTy; 8923 else if (!LastEnumConst) { 8924 // C++0x [dcl.enum]p5: 8925 // If the underlying type is not fixed, the type of each enumerator 8926 // is the type of its initializing value: 8927 // - If no initializer is specified for the first enumerator, the 8928 // initializing value has an unspecified integral type. 8929 // 8930 // GCC uses 'int' for its unspecified integral type, as does 8931 // C99 6.7.2.2p3. 8932 if (Enum->isFixed()) { 8933 EltTy = Enum->getIntegerType(); 8934 } 8935 else { 8936 EltTy = Context.IntTy; 8937 } 8938 } else { 8939 // Assign the last value + 1. 8940 EnumVal = LastEnumConst->getInitVal(); 8941 ++EnumVal; 8942 EltTy = LastEnumConst->getType(); 8943 8944 // Check for overflow on increment. 8945 if (EnumVal < LastEnumConst->getInitVal()) { 8946 // C++0x [dcl.enum]p5: 8947 // If the underlying type is not fixed, the type of each enumerator 8948 // is the type of its initializing value: 8949 // 8950 // - Otherwise the type of the initializing value is the same as 8951 // the type of the initializing value of the preceding enumerator 8952 // unless the incremented value is not representable in that type, 8953 // in which case the type is an unspecified integral type 8954 // sufficient to contain the incremented value. If no such type 8955 // exists, the program is ill-formed. 8956 QualType T = getNextLargerIntegralType(Context, EltTy); 8957 if (T.isNull() || Enum->isFixed()) { 8958 // There is no integral type larger enough to represent this 8959 // value. Complain, then allow the value to wrap around. 8960 EnumVal = LastEnumConst->getInitVal(); 8961 EnumVal = EnumVal.zext(EnumVal.getBitWidth() * 2); 8962 ++EnumVal; 8963 if (Enum->isFixed()) 8964 // When the underlying type is fixed, this is ill-formed. 8965 Diag(IdLoc, diag::err_enumerator_wrapped) 8966 << EnumVal.toString(10) 8967 << EltTy; 8968 else 8969 Diag(IdLoc, diag::warn_enumerator_too_large) 8970 << EnumVal.toString(10); 8971 } else { 8972 EltTy = T; 8973 } 8974 8975 // Retrieve the last enumerator's value, extent that type to the 8976 // type that is supposed to be large enough to represent the incremented 8977 // value, then increment. 8978 EnumVal = LastEnumConst->getInitVal(); 8979 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 8980 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 8981 ++EnumVal; 8982 8983 // If we're not in C++, diagnose the overflow of enumerator values, 8984 // which in C99 means that the enumerator value is not representable in 8985 // an int (C99 6.7.2.2p2). However, we support GCC's extension that 8986 // permits enumerator values that are representable in some larger 8987 // integral type. 8988 if (!getLangOptions().CPlusPlus && !T.isNull()) 8989 Diag(IdLoc, diag::warn_enum_value_overflow); 8990 } else if (!getLangOptions().CPlusPlus && 8991 !isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 8992 // Enforce C99 6.7.2.2p2 even when we compute the next value. 8993 Diag(IdLoc, diag::ext_enum_value_not_int) 8994 << EnumVal.toString(10) << 1; 8995 } 8996 } 8997 } 8998 8999 if (!EltTy->isDependentType()) { 9000 // Make the enumerator value match the signedness and size of the 9001 // enumerator's type. 9002 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 9003 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 9004 } 9005 9006 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 9007 Val, EnumVal); 9008} 9009 9010 9011Decl *Sema::ActOnEnumConstant(Scope *S, Decl *theEnumDecl, Decl *lastEnumConst, 9012 SourceLocation IdLoc, IdentifierInfo *Id, 9013 AttributeList *Attr, 9014 SourceLocation EqualLoc, ExprTy *val) { 9015 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl); 9016 EnumConstantDecl *LastEnumConst = 9017 cast_or_null<EnumConstantDecl>(lastEnumConst); 9018 Expr *Val = static_cast<Expr*>(val); 9019 9020 // The scope passed in may not be a decl scope. Zip up the scope tree until 9021 // we find one that is. 9022 S = getNonFieldDeclScope(S); 9023 9024 // Verify that there isn't already something declared with this name in this 9025 // scope. 9026 NamedDecl *PrevDecl = LookupSingleName(S, Id, IdLoc, LookupOrdinaryName, 9027 ForRedeclaration); 9028 if (PrevDecl && PrevDecl->isTemplateParameter()) { 9029 // Maybe we will complain about the shadowed template parameter. 9030 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 9031 // Just pretend that we didn't see the previous declaration. 9032 PrevDecl = 0; 9033 } 9034 9035 if (PrevDecl) { 9036 // When in C++, we may get a TagDecl with the same name; in this case the 9037 // enum constant will 'hide' the tag. 9038 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 9039 "Received TagDecl when not in C++!"); 9040 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 9041 if (isa<EnumConstantDecl>(PrevDecl)) 9042 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 9043 else 9044 Diag(IdLoc, diag::err_redefinition) << Id; 9045 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 9046 return 0; 9047 } 9048 } 9049 9050 // C++ [class.mem]p13: 9051 // If T is the name of a class, then each of the following shall have a 9052 // name different from T: 9053 // - every enumerator of every member of class T that is an enumerated 9054 // type 9055 if (CXXRecordDecl *Record 9056 = dyn_cast<CXXRecordDecl>( 9057 TheEnumDecl->getDeclContext()->getRedeclContext())) 9058 if (Record->getIdentifier() && Record->getIdentifier() == Id) 9059 Diag(IdLoc, diag::err_member_name_of_class) << Id; 9060 9061 EnumConstantDecl *New = 9062 CheckEnumConstant(TheEnumDecl, LastEnumConst, IdLoc, Id, Val); 9063 9064 if (New) { 9065 // Process attributes. 9066 if (Attr) ProcessDeclAttributeList(S, New, Attr); 9067 9068 // Register this decl in the current scope stack. 9069 New->setAccess(TheEnumDecl->getAccess()); 9070 PushOnScopeChains(New, S); 9071 } 9072 9073 return New; 9074} 9075 9076void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc, 9077 SourceLocation RBraceLoc, Decl *EnumDeclX, 9078 Decl **Elements, unsigned NumElements, 9079 Scope *S, AttributeList *Attr) { 9080 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX); 9081 QualType EnumType = Context.getTypeDeclType(Enum); 9082 9083 if (Attr) 9084 ProcessDeclAttributeList(S, Enum, Attr); 9085 9086 if (Enum->isDependentType()) { 9087 for (unsigned i = 0; i != NumElements; ++i) { 9088 EnumConstantDecl *ECD = 9089 cast_or_null<EnumConstantDecl>(Elements[i]); 9090 if (!ECD) continue; 9091 9092 ECD->setType(EnumType); 9093 } 9094 9095 Enum->completeDefinition(Context.DependentTy, Context.DependentTy, 0, 0); 9096 return; 9097 } 9098 9099 // TODO: If the result value doesn't fit in an int, it must be a long or long 9100 // long value. ISO C does not support this, but GCC does as an extension, 9101 // emit a warning. 9102 unsigned IntWidth = Context.Target.getIntWidth(); 9103 unsigned CharWidth = Context.Target.getCharWidth(); 9104 unsigned ShortWidth = Context.Target.getShortWidth(); 9105 9106 // Verify that all the values are okay, compute the size of the values, and 9107 // reverse the list. 9108 unsigned NumNegativeBits = 0; 9109 unsigned NumPositiveBits = 0; 9110 9111 // Keep track of whether all elements have type int. 9112 bool AllElementsInt = true; 9113 9114 for (unsigned i = 0; i != NumElements; ++i) { 9115 EnumConstantDecl *ECD = 9116 cast_or_null<EnumConstantDecl>(Elements[i]); 9117 if (!ECD) continue; // Already issued a diagnostic. 9118 9119 const llvm::APSInt &InitVal = ECD->getInitVal(); 9120 9121 // Keep track of the size of positive and negative values. 9122 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 9123 NumPositiveBits = std::max(NumPositiveBits, 9124 (unsigned)InitVal.getActiveBits()); 9125 else 9126 NumNegativeBits = std::max(NumNegativeBits, 9127 (unsigned)InitVal.getMinSignedBits()); 9128 9129 // Keep track of whether every enum element has type int (very commmon). 9130 if (AllElementsInt) 9131 AllElementsInt = ECD->getType() == Context.IntTy; 9132 } 9133 9134 // Figure out the type that should be used for this enum. 9135 QualType BestType; 9136 unsigned BestWidth; 9137 9138 // C++0x N3000 [conv.prom]p3: 9139 // An rvalue of an unscoped enumeration type whose underlying 9140 // type is not fixed can be converted to an rvalue of the first 9141 // of the following types that can represent all the values of 9142 // the enumeration: int, unsigned int, long int, unsigned long 9143 // int, long long int, or unsigned long long int. 9144 // C99 6.4.4.3p2: 9145 // An identifier declared as an enumeration constant has type int. 9146 // The C99 rule is modified by a gcc extension 9147 QualType BestPromotionType; 9148 9149 bool Packed = Enum->getAttr<PackedAttr>() ? true : false; 9150 // -fshort-enums is the equivalent to specifying the packed attribute on all 9151 // enum definitions. 9152 if (LangOpts.ShortEnums) 9153 Packed = true; 9154 9155 if (Enum->isFixed()) { 9156 BestType = BestPromotionType = Enum->getIntegerType(); 9157 // We don't need to set BestWidth, because BestType is going to be the type 9158 // of the enumerators, but we do anyway because otherwise some compilers 9159 // warn that it might be used uninitialized. 9160 BestWidth = CharWidth; 9161 } 9162 else if (NumNegativeBits) { 9163 // If there is a negative value, figure out the smallest integer type (of 9164 // int/long/longlong) that fits. 9165 // If it's packed, check also if it fits a char or a short. 9166 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) { 9167 BestType = Context.SignedCharTy; 9168 BestWidth = CharWidth; 9169 } else if (Packed && NumNegativeBits <= ShortWidth && 9170 NumPositiveBits < ShortWidth) { 9171 BestType = Context.ShortTy; 9172 BestWidth = ShortWidth; 9173 } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 9174 BestType = Context.IntTy; 9175 BestWidth = IntWidth; 9176 } else { 9177 BestWidth = Context.Target.getLongWidth(); 9178 9179 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) { 9180 BestType = Context.LongTy; 9181 } else { 9182 BestWidth = Context.Target.getLongLongWidth(); 9183 9184 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 9185 Diag(Enum->getLocation(), diag::warn_enum_too_large); 9186 BestType = Context.LongLongTy; 9187 } 9188 } 9189 BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType); 9190 } else { 9191 // If there is no negative value, figure out the smallest type that fits 9192 // all of the enumerator values. 9193 // If it's packed, check also if it fits a char or a short. 9194 if (Packed && NumPositiveBits <= CharWidth) { 9195 BestType = Context.UnsignedCharTy; 9196 BestPromotionType = Context.IntTy; 9197 BestWidth = CharWidth; 9198 } else if (Packed && NumPositiveBits <= ShortWidth) { 9199 BestType = Context.UnsignedShortTy; 9200 BestPromotionType = Context.IntTy; 9201 BestWidth = ShortWidth; 9202 } else if (NumPositiveBits <= IntWidth) { 9203 BestType = Context.UnsignedIntTy; 9204 BestWidth = IntWidth; 9205 BestPromotionType 9206 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9207 ? Context.UnsignedIntTy : Context.IntTy; 9208 } else if (NumPositiveBits <= 9209 (BestWidth = Context.Target.getLongWidth())) { 9210 BestType = Context.UnsignedLongTy; 9211 BestPromotionType 9212 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9213 ? Context.UnsignedLongTy : Context.LongTy; 9214 } else { 9215 BestWidth = Context.Target.getLongLongWidth(); 9216 assert(NumPositiveBits <= BestWidth && 9217 "How could an initializer get larger than ULL?"); 9218 BestType = Context.UnsignedLongLongTy; 9219 BestPromotionType 9220 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9221 ? Context.UnsignedLongLongTy : Context.LongLongTy; 9222 } 9223 } 9224 9225 // Loop over all of the enumerator constants, changing their types to match 9226 // the type of the enum if needed. 9227 for (unsigned i = 0; i != NumElements; ++i) { 9228 EnumConstantDecl *ECD = cast_or_null<EnumConstantDecl>(Elements[i]); 9229 if (!ECD) continue; // Already issued a diagnostic. 9230 9231 // Standard C says the enumerators have int type, but we allow, as an 9232 // extension, the enumerators to be larger than int size. If each 9233 // enumerator value fits in an int, type it as an int, otherwise type it the 9234 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 9235 // that X has type 'int', not 'unsigned'. 9236 9237 // Determine whether the value fits into an int. 9238 llvm::APSInt InitVal = ECD->getInitVal(); 9239 9240 // If it fits into an integer type, force it. Otherwise force it to match 9241 // the enum decl type. 9242 QualType NewTy; 9243 unsigned NewWidth; 9244 bool NewSign; 9245 if (!getLangOptions().CPlusPlus && 9246 isRepresentableIntegerValue(Context, InitVal, Context.IntTy)) { 9247 NewTy = Context.IntTy; 9248 NewWidth = IntWidth; 9249 NewSign = true; 9250 } else if (ECD->getType() == BestType) { 9251 // Already the right type! 9252 if (getLangOptions().CPlusPlus) 9253 // C++ [dcl.enum]p4: Following the closing brace of an 9254 // enum-specifier, each enumerator has the type of its 9255 // enumeration. 9256 ECD->setType(EnumType); 9257 continue; 9258 } else { 9259 NewTy = BestType; 9260 NewWidth = BestWidth; 9261 NewSign = BestType->isSignedIntegerOrEnumerationType(); 9262 } 9263 9264 // Adjust the APSInt value. 9265 InitVal = InitVal.extOrTrunc(NewWidth); 9266 InitVal.setIsSigned(NewSign); 9267 ECD->setInitVal(InitVal); 9268 9269 // Adjust the Expr initializer and type. 9270 if (ECD->getInitExpr() && 9271 !Context.hasSameType(NewTy, ECD->getInitExpr()->getType())) 9272 ECD->setInitExpr(ImplicitCastExpr::Create(Context, NewTy, 9273 CK_IntegralCast, 9274 ECD->getInitExpr(), 9275 /*base paths*/ 0, 9276 VK_RValue)); 9277 if (getLangOptions().CPlusPlus) 9278 // C++ [dcl.enum]p4: Following the closing brace of an 9279 // enum-specifier, each enumerator has the type of its 9280 // enumeration. 9281 ECD->setType(EnumType); 9282 else 9283 ECD->setType(NewTy); 9284 } 9285 9286 Enum->completeDefinition(BestType, BestPromotionType, 9287 NumPositiveBits, NumNegativeBits); 9288} 9289 9290Decl *Sema::ActOnFileScopeAsmDecl(Expr *expr, 9291 SourceLocation StartLoc, 9292 SourceLocation EndLoc) { 9293 StringLiteral *AsmString = cast<StringLiteral>(expr); 9294 9295 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext, 9296 AsmString, StartLoc, 9297 EndLoc); 9298 CurContext->addDecl(New); 9299 return New; 9300} 9301 9302void Sema::ActOnPragmaWeakID(IdentifierInfo* Name, 9303 SourceLocation PragmaLoc, 9304 SourceLocation NameLoc) { 9305 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, LookupOrdinaryName); 9306 9307 if (PrevDecl) { 9308 PrevDecl->addAttr(::new (Context) WeakAttr(PragmaLoc, Context)); 9309 } else { 9310 (void)WeakUndeclaredIdentifiers.insert( 9311 std::pair<IdentifierInfo*,WeakInfo> 9312 (Name, WeakInfo((IdentifierInfo*)0, NameLoc))); 9313 } 9314} 9315 9316void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name, 9317 IdentifierInfo* AliasName, 9318 SourceLocation PragmaLoc, 9319 SourceLocation NameLoc, 9320 SourceLocation AliasNameLoc) { 9321 Decl *PrevDecl = LookupSingleName(TUScope, AliasName, AliasNameLoc, 9322 LookupOrdinaryName); 9323 WeakInfo W = WeakInfo(Name, NameLoc); 9324 9325 if (PrevDecl) { 9326 if (!PrevDecl->hasAttr<AliasAttr>()) 9327 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl)) 9328 DeclApplyPragmaWeak(TUScope, ND, W); 9329 } else { 9330 (void)WeakUndeclaredIdentifiers.insert( 9331 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W)); 9332 } 9333} 9334