SemaDecl.cpp revision 93476ddd9ce490f9c08d78b640efad812cb019d1
1//===--- SemaDecl.cpp - Semantic Analysis for Declarations ----------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements semantic analysis for declarations. 11// 12//===----------------------------------------------------------------------===// 13 14#include "clang/Sema/SemaInternal.h" 15#include "clang/Sema/Initialization.h" 16#include "clang/Sema/Lookup.h" 17#include "clang/Sema/CXXFieldCollector.h" 18#include "clang/Sema/Scope.h" 19#include "clang/Sema/ScopeInfo.h" 20#include "TypeLocBuilder.h" 21#include "clang/AST/APValue.h" 22#include "clang/AST/ASTConsumer.h" 23#include "clang/AST/ASTContext.h" 24#include "clang/AST/CXXInheritance.h" 25#include "clang/AST/DeclCXX.h" 26#include "clang/AST/DeclObjC.h" 27#include "clang/AST/DeclTemplate.h" 28#include "clang/AST/EvaluatedExprVisitor.h" 29#include "clang/AST/ExprCXX.h" 30#include "clang/AST/StmtCXX.h" 31#include "clang/AST/CharUnits.h" 32#include "clang/Sema/DeclSpec.h" 33#include "clang/Sema/ParsedTemplate.h" 34#include "clang/Parse/ParseDiagnostic.h" 35#include "clang/Basic/PartialDiagnostic.h" 36#include "clang/Basic/SourceManager.h" 37#include "clang/Basic/TargetInfo.h" 38// FIXME: layering (ideally, Sema shouldn't be dependent on Lex API's) 39#include "clang/Lex/Preprocessor.h" 40#include "clang/Lex/HeaderSearch.h" 41#include "clang/Lex/ModuleLoader.h" 42#include "llvm/ADT/Triple.h" 43#include <algorithm> 44#include <cstring> 45#include <functional> 46using namespace clang; 47using namespace sema; 48 49Sema::DeclGroupPtrTy Sema::ConvertDeclToDeclGroup(Decl *Ptr, Decl *OwnedType) { 50 if (OwnedType) { 51 Decl *Group[2] = { OwnedType, Ptr }; 52 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, 2)); 53 } 54 55 return DeclGroupPtrTy::make(DeclGroupRef(Ptr)); 56} 57 58/// \brief If the identifier refers to a type name within this scope, 59/// return the declaration of that type. 60/// 61/// This routine performs ordinary name lookup of the identifier II 62/// within the given scope, with optional C++ scope specifier SS, to 63/// determine whether the name refers to a type. If so, returns an 64/// opaque pointer (actually a QualType) corresponding to that 65/// type. Otherwise, returns NULL. 66/// 67/// If name lookup results in an ambiguity, this routine will complain 68/// and then return NULL. 69ParsedType Sema::getTypeName(IdentifierInfo &II, SourceLocation NameLoc, 70 Scope *S, CXXScopeSpec *SS, 71 bool isClassName, bool HasTrailingDot, 72 ParsedType ObjectTypePtr, 73 bool WantNontrivialTypeSourceInfo, 74 IdentifierInfo **CorrectedII) { 75 // Determine where we will perform name lookup. 76 DeclContext *LookupCtx = 0; 77 if (ObjectTypePtr) { 78 QualType ObjectType = ObjectTypePtr.get(); 79 if (ObjectType->isRecordType()) 80 LookupCtx = computeDeclContext(ObjectType); 81 } else if (SS && SS->isNotEmpty()) { 82 LookupCtx = computeDeclContext(*SS, false); 83 84 if (!LookupCtx) { 85 if (isDependentScopeSpecifier(*SS)) { 86 // C++ [temp.res]p3: 87 // A qualified-id that refers to a type and in which the 88 // nested-name-specifier depends on a template-parameter (14.6.2) 89 // shall be prefixed by the keyword typename to indicate that the 90 // qualified-id denotes a type, forming an 91 // elaborated-type-specifier (7.1.5.3). 92 // 93 // We therefore do not perform any name lookup if the result would 94 // refer to a member of an unknown specialization. 95 if (!isClassName) 96 return ParsedType(); 97 98 // We know from the grammar that this name refers to a type, 99 // so build a dependent node to describe the type. 100 if (WantNontrivialTypeSourceInfo) 101 return ActOnTypenameType(S, SourceLocation(), *SS, II, NameLoc).get(); 102 103 NestedNameSpecifierLoc QualifierLoc = SS->getWithLocInContext(Context); 104 QualType T = 105 CheckTypenameType(ETK_None, SourceLocation(), QualifierLoc, 106 II, NameLoc); 107 108 return ParsedType::make(T); 109 } 110 111 return ParsedType(); 112 } 113 114 if (!LookupCtx->isDependentContext() && 115 RequireCompleteDeclContext(*SS, LookupCtx)) 116 return ParsedType(); 117 } 118 119 // FIXME: LookupNestedNameSpecifierName isn't the right kind of 120 // lookup for class-names. 121 LookupNameKind Kind = isClassName ? LookupNestedNameSpecifierName : 122 LookupOrdinaryName; 123 LookupResult Result(*this, &II, NameLoc, Kind); 124 if (LookupCtx) { 125 // Perform "qualified" name lookup into the declaration context we 126 // computed, which is either the type of the base of a member access 127 // expression or the declaration context associated with a prior 128 // nested-name-specifier. 129 LookupQualifiedName(Result, LookupCtx); 130 131 if (ObjectTypePtr && Result.empty()) { 132 // C++ [basic.lookup.classref]p3: 133 // If the unqualified-id is ~type-name, the type-name is looked up 134 // in the context of the entire postfix-expression. If the type T of 135 // the object expression is of a class type C, the type-name is also 136 // looked up in the scope of class C. At least one of the lookups shall 137 // find a name that refers to (possibly cv-qualified) T. 138 LookupName(Result, S); 139 } 140 } else { 141 // Perform unqualified name lookup. 142 LookupName(Result, S); 143 } 144 145 NamedDecl *IIDecl = 0; 146 switch (Result.getResultKind()) { 147 case LookupResult::NotFound: 148 case LookupResult::NotFoundInCurrentInstantiation: 149 if (CorrectedII) { 150 TypoCorrection Correction = CorrectTypo(Result.getLookupNameInfo(), 151 Kind, S, SS, 0, false, 152 Sema::CTC_Type); 153 IdentifierInfo *NewII = Correction.getCorrectionAsIdentifierInfo(); 154 TemplateTy Template; 155 bool MemberOfUnknownSpecialization; 156 UnqualifiedId TemplateName; 157 TemplateName.setIdentifier(NewII, NameLoc); 158 NestedNameSpecifier *NNS = Correction.getCorrectionSpecifier(); 159 CXXScopeSpec NewSS, *NewSSPtr = SS; 160 if (SS && NNS) { 161 NewSS.MakeTrivial(Context, NNS, SourceRange(NameLoc)); 162 NewSSPtr = &NewSS; 163 } 164 if (Correction && (NNS || NewII != &II) && 165 // Ignore a correction to a template type as the to-be-corrected 166 // identifier is not a template (typo correction for template names 167 // is handled elsewhere). 168 !(getLangOptions().CPlusPlus && NewSSPtr && 169 isTemplateName(S, *NewSSPtr, false, TemplateName, ParsedType(), 170 false, Template, MemberOfUnknownSpecialization))) { 171 ParsedType Ty = getTypeName(*NewII, NameLoc, S, NewSSPtr, 172 isClassName, HasTrailingDot, ObjectTypePtr, 173 WantNontrivialTypeSourceInfo); 174 if (Ty) { 175 std::string CorrectedStr(Correction.getAsString(getLangOptions())); 176 std::string CorrectedQuotedStr( 177 Correction.getQuoted(getLangOptions())); 178 Diag(NameLoc, diag::err_unknown_typename_suggest) 179 << Result.getLookupName() << CorrectedQuotedStr 180 << FixItHint::CreateReplacement(SourceRange(NameLoc), 181 CorrectedStr); 182 if (NamedDecl *FirstDecl = Correction.getCorrectionDecl()) 183 Diag(FirstDecl->getLocation(), diag::note_previous_decl) 184 << CorrectedQuotedStr; 185 186 if (SS && NNS) 187 SS->MakeTrivial(Context, NNS, SourceRange(NameLoc)); 188 *CorrectedII = NewII; 189 return Ty; 190 } 191 } 192 } 193 // If typo correction failed or was not performed, fall through 194 case LookupResult::FoundOverloaded: 195 case LookupResult::FoundUnresolvedValue: 196 Result.suppressDiagnostics(); 197 return ParsedType(); 198 199 case LookupResult::Ambiguous: 200 // Recover from type-hiding ambiguities by hiding the type. We'll 201 // do the lookup again when looking for an object, and we can 202 // diagnose the error then. If we don't do this, then the error 203 // about hiding the type will be immediately followed by an error 204 // that only makes sense if the identifier was treated like a type. 205 if (Result.getAmbiguityKind() == LookupResult::AmbiguousTagHiding) { 206 Result.suppressDiagnostics(); 207 return ParsedType(); 208 } 209 210 // Look to see if we have a type anywhere in the list of results. 211 for (LookupResult::iterator Res = Result.begin(), ResEnd = Result.end(); 212 Res != ResEnd; ++Res) { 213 if (isa<TypeDecl>(*Res) || isa<ObjCInterfaceDecl>(*Res)) { 214 if (!IIDecl || 215 (*Res)->getLocation().getRawEncoding() < 216 IIDecl->getLocation().getRawEncoding()) 217 IIDecl = *Res; 218 } 219 } 220 221 if (!IIDecl) { 222 // None of the entities we found is a type, so there is no way 223 // to even assume that the result is a type. In this case, don't 224 // complain about the ambiguity. The parser will either try to 225 // perform this lookup again (e.g., as an object name), which 226 // will produce the ambiguity, or will complain that it expected 227 // a type name. 228 Result.suppressDiagnostics(); 229 return ParsedType(); 230 } 231 232 // We found a type within the ambiguous lookup; diagnose the 233 // ambiguity and then return that type. This might be the right 234 // answer, or it might not be, but it suppresses any attempt to 235 // perform the name lookup again. 236 break; 237 238 case LookupResult::Found: 239 IIDecl = Result.getFoundDecl(); 240 break; 241 } 242 243 assert(IIDecl && "Didn't find decl"); 244 245 QualType T; 246 if (TypeDecl *TD = dyn_cast<TypeDecl>(IIDecl)) { 247 DiagnoseUseOfDecl(IIDecl, NameLoc); 248 249 if (T.isNull()) 250 T = Context.getTypeDeclType(TD); 251 252 if (SS && SS->isNotEmpty()) { 253 if (WantNontrivialTypeSourceInfo) { 254 // Construct a type with type-source information. 255 TypeLocBuilder Builder; 256 Builder.pushTypeSpec(T).setNameLoc(NameLoc); 257 258 T = getElaboratedType(ETK_None, *SS, T); 259 ElaboratedTypeLoc ElabTL = Builder.push<ElaboratedTypeLoc>(T); 260 ElabTL.setKeywordLoc(SourceLocation()); 261 ElabTL.setQualifierLoc(SS->getWithLocInContext(Context)); 262 return CreateParsedType(T, Builder.getTypeSourceInfo(Context, T)); 263 } else { 264 T = getElaboratedType(ETK_None, *SS, T); 265 } 266 } 267 } else if (ObjCInterfaceDecl *IDecl = dyn_cast<ObjCInterfaceDecl>(IIDecl)) { 268 (void)DiagnoseUseOfDecl(IDecl, NameLoc); 269 if (!HasTrailingDot) 270 T = Context.getObjCInterfaceType(IDecl); 271 } 272 273 if (T.isNull()) { 274 // If it's not plausibly a type, suppress diagnostics. 275 Result.suppressDiagnostics(); 276 return ParsedType(); 277 } 278 return ParsedType::make(T); 279} 280 281/// isTagName() - This method is called *for error recovery purposes only* 282/// to determine if the specified name is a valid tag name ("struct foo"). If 283/// so, this returns the TST for the tag corresponding to it (TST_enum, 284/// TST_union, TST_struct, TST_class). This is used to diagnose cases in C 285/// where the user forgot to specify the tag. 286DeclSpec::TST Sema::isTagName(IdentifierInfo &II, Scope *S) { 287 // Do a tag name lookup in this scope. 288 LookupResult R(*this, &II, SourceLocation(), LookupTagName); 289 LookupName(R, S, false); 290 R.suppressDiagnostics(); 291 if (R.getResultKind() == LookupResult::Found) 292 if (const TagDecl *TD = R.getAsSingle<TagDecl>()) { 293 switch (TD->getTagKind()) { 294 default: return DeclSpec::TST_unspecified; 295 case TTK_Struct: return DeclSpec::TST_struct; 296 case TTK_Union: return DeclSpec::TST_union; 297 case TTK_Class: return DeclSpec::TST_class; 298 case TTK_Enum: return DeclSpec::TST_enum; 299 } 300 } 301 302 return DeclSpec::TST_unspecified; 303} 304 305/// isMicrosoftMissingTypename - In Microsoft mode, within class scope, 306/// if a CXXScopeSpec's type is equal to the type of one of the base classes 307/// then downgrade the missing typename error to a warning. 308/// This is needed for MSVC compatibility; Example: 309/// @code 310/// template<class T> class A { 311/// public: 312/// typedef int TYPE; 313/// }; 314/// template<class T> class B : public A<T> { 315/// public: 316/// A<T>::TYPE a; // no typename required because A<T> is a base class. 317/// }; 318/// @endcode 319bool Sema::isMicrosoftMissingTypename(const CXXScopeSpec *SS) { 320 if (CurContext->isRecord()) { 321 const Type *Ty = SS->getScopeRep()->getAsType(); 322 323 CXXRecordDecl *RD = cast<CXXRecordDecl>(CurContext); 324 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 325 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) 326 if (Context.hasSameUnqualifiedType(QualType(Ty, 1), Base->getType())) 327 return true; 328 } 329 return CurContext->isFunctionOrMethod(); 330} 331 332bool Sema::DiagnoseUnknownTypeName(const IdentifierInfo &II, 333 SourceLocation IILoc, 334 Scope *S, 335 CXXScopeSpec *SS, 336 ParsedType &SuggestedType) { 337 // We don't have anything to suggest (yet). 338 SuggestedType = ParsedType(); 339 340 // There may have been a typo in the name of the type. Look up typo 341 // results, in case we have something that we can suggest. 342 if (TypoCorrection Corrected = CorrectTypo(DeclarationNameInfo(&II, IILoc), 343 LookupOrdinaryName, S, SS, NULL, 344 false, CTC_Type)) { 345 std::string CorrectedStr(Corrected.getAsString(getLangOptions())); 346 std::string CorrectedQuotedStr(Corrected.getQuoted(getLangOptions())); 347 348 if (Corrected.isKeyword()) { 349 // We corrected to a keyword. 350 // FIXME: Actually recover with the keyword we suggest, and emit a fix-it. 351 Diag(IILoc, diag::err_unknown_typename_suggest) 352 << &II << CorrectedQuotedStr; 353 return true; 354 } else { 355 NamedDecl *Result = Corrected.getCorrectionDecl(); 356 if ((isa<TypeDecl>(Result) || isa<ObjCInterfaceDecl>(Result)) && 357 !Result->isInvalidDecl()) { 358 // We found a similarly-named type or interface; suggest that. 359 if (!SS || !SS->isSet()) 360 Diag(IILoc, diag::err_unknown_typename_suggest) 361 << &II << CorrectedQuotedStr 362 << FixItHint::CreateReplacement(SourceRange(IILoc), CorrectedStr); 363 else if (DeclContext *DC = computeDeclContext(*SS, false)) 364 Diag(IILoc, diag::err_unknown_nested_typename_suggest) 365 << &II << DC << CorrectedQuotedStr << SS->getRange() 366 << FixItHint::CreateReplacement(SourceRange(IILoc), CorrectedStr); 367 else 368 llvm_unreachable("could not have corrected a typo here"); 369 370 Diag(Result->getLocation(), diag::note_previous_decl) 371 << CorrectedQuotedStr; 372 373 SuggestedType = getTypeName(*Result->getIdentifier(), IILoc, S, SS, 374 false, false, ParsedType(), 375 /*NonTrivialTypeSourceInfo=*/true); 376 return true; 377 } 378 } 379 } 380 381 if (getLangOptions().CPlusPlus) { 382 // See if II is a class template that the user forgot to pass arguments to. 383 UnqualifiedId Name; 384 Name.setIdentifier(&II, IILoc); 385 CXXScopeSpec EmptySS; 386 TemplateTy TemplateResult; 387 bool MemberOfUnknownSpecialization; 388 if (isTemplateName(S, SS ? *SS : EmptySS, /*hasTemplateKeyword=*/false, 389 Name, ParsedType(), true, TemplateResult, 390 MemberOfUnknownSpecialization) == TNK_Type_template) { 391 TemplateName TplName = TemplateResult.getAsVal<TemplateName>(); 392 Diag(IILoc, diag::err_template_missing_args) << TplName; 393 if (TemplateDecl *TplDecl = TplName.getAsTemplateDecl()) { 394 Diag(TplDecl->getLocation(), diag::note_template_decl_here) 395 << TplDecl->getTemplateParameters()->getSourceRange(); 396 } 397 return true; 398 } 399 } 400 401 // FIXME: Should we move the logic that tries to recover from a missing tag 402 // (struct, union, enum) from Parser::ParseImplicitInt here, instead? 403 404 if (!SS || (!SS->isSet() && !SS->isInvalid())) 405 Diag(IILoc, diag::err_unknown_typename) << &II; 406 else if (DeclContext *DC = computeDeclContext(*SS, false)) 407 Diag(IILoc, diag::err_typename_nested_not_found) 408 << &II << DC << SS->getRange(); 409 else if (isDependentScopeSpecifier(*SS)) { 410 unsigned DiagID = diag::err_typename_missing; 411 if (getLangOptions().MicrosoftMode && isMicrosoftMissingTypename(SS)) 412 DiagID = diag::warn_typename_missing; 413 414 Diag(SS->getRange().getBegin(), DiagID) 415 << (NestedNameSpecifier *)SS->getScopeRep() << II.getName() 416 << SourceRange(SS->getRange().getBegin(), IILoc) 417 << FixItHint::CreateInsertion(SS->getRange().getBegin(), "typename "); 418 SuggestedType = ActOnTypenameType(S, SourceLocation(), *SS, II, IILoc).get(); 419 } else { 420 assert(SS && SS->isInvalid() && 421 "Invalid scope specifier has already been diagnosed"); 422 } 423 424 return true; 425} 426 427/// \brief Determine whether the given result set contains either a type name 428/// or 429static bool isResultTypeOrTemplate(LookupResult &R, const Token &NextToken) { 430 bool CheckTemplate = R.getSema().getLangOptions().CPlusPlus && 431 NextToken.is(tok::less); 432 433 for (LookupResult::iterator I = R.begin(), IEnd = R.end(); I != IEnd; ++I) { 434 if (isa<TypeDecl>(*I) || isa<ObjCInterfaceDecl>(*I)) 435 return true; 436 437 if (CheckTemplate && isa<TemplateDecl>(*I)) 438 return true; 439 } 440 441 return false; 442} 443 444Sema::NameClassification Sema::ClassifyName(Scope *S, 445 CXXScopeSpec &SS, 446 IdentifierInfo *&Name, 447 SourceLocation NameLoc, 448 const Token &NextToken) { 449 DeclarationNameInfo NameInfo(Name, NameLoc); 450 ObjCMethodDecl *CurMethod = getCurMethodDecl(); 451 452 if (NextToken.is(tok::coloncolon)) { 453 BuildCXXNestedNameSpecifier(S, *Name, NameLoc, NextToken.getLocation(), 454 QualType(), false, SS, 0, false); 455 456 } 457 458 LookupResult Result(*this, Name, NameLoc, LookupOrdinaryName); 459 LookupParsedName(Result, S, &SS, !CurMethod); 460 461 // Perform lookup for Objective-C instance variables (including automatically 462 // synthesized instance variables), if we're in an Objective-C method. 463 // FIXME: This lookup really, really needs to be folded in to the normal 464 // unqualified lookup mechanism. 465 if (!SS.isSet() && CurMethod && !isResultTypeOrTemplate(Result, NextToken)) { 466 ExprResult E = LookupInObjCMethod(Result, S, Name, true); 467 if (E.get() || E.isInvalid()) 468 return E; 469 } 470 471 bool SecondTry = false; 472 bool IsFilteredTemplateName = false; 473 474Corrected: 475 switch (Result.getResultKind()) { 476 case LookupResult::NotFound: 477 // If an unqualified-id is followed by a '(', then we have a function 478 // call. 479 if (!SS.isSet() && NextToken.is(tok::l_paren)) { 480 // In C++, this is an ADL-only call. 481 // FIXME: Reference? 482 if (getLangOptions().CPlusPlus) 483 return BuildDeclarationNameExpr(SS, Result, /*ADL=*/true); 484 485 // C90 6.3.2.2: 486 // If the expression that precedes the parenthesized argument list in a 487 // function call consists solely of an identifier, and if no 488 // declaration is visible for this identifier, the identifier is 489 // implicitly declared exactly as if, in the innermost block containing 490 // the function call, the declaration 491 // 492 // extern int identifier (); 493 // 494 // appeared. 495 // 496 // We also allow this in C99 as an extension. 497 if (NamedDecl *D = ImplicitlyDefineFunction(NameLoc, *Name, S)) { 498 Result.addDecl(D); 499 Result.resolveKind(); 500 return BuildDeclarationNameExpr(SS, Result, /*ADL=*/false); 501 } 502 } 503 504 // In C, we first see whether there is a tag type by the same name, in 505 // which case it's likely that the user just forget to write "enum", 506 // "struct", or "union". 507 if (!getLangOptions().CPlusPlus && !SecondTry) { 508 Result.clear(LookupTagName); 509 LookupParsedName(Result, S, &SS); 510 if (TagDecl *Tag = Result.getAsSingle<TagDecl>()) { 511 const char *TagName = 0; 512 const char *FixItTagName = 0; 513 switch (Tag->getTagKind()) { 514 case TTK_Class: 515 TagName = "class"; 516 FixItTagName = "class "; 517 break; 518 519 case TTK_Enum: 520 TagName = "enum"; 521 FixItTagName = "enum "; 522 break; 523 524 case TTK_Struct: 525 TagName = "struct"; 526 FixItTagName = "struct "; 527 break; 528 529 case TTK_Union: 530 TagName = "union"; 531 FixItTagName = "union "; 532 break; 533 } 534 535 Diag(NameLoc, diag::err_use_of_tag_name_without_tag) 536 << Name << TagName << getLangOptions().CPlusPlus 537 << FixItHint::CreateInsertion(NameLoc, FixItTagName); 538 break; 539 } 540 541 Result.clear(LookupOrdinaryName); 542 } 543 544 // Perform typo correction to determine if there is another name that is 545 // close to this name. 546 if (!SecondTry) { 547 SecondTry = true; 548 if (TypoCorrection Corrected = CorrectTypo(Result.getLookupNameInfo(), 549 Result.getLookupKind(), S, &SS)) { 550 unsigned UnqualifiedDiag = diag::err_undeclared_var_use_suggest; 551 unsigned QualifiedDiag = diag::err_no_member_suggest; 552 std::string CorrectedStr(Corrected.getAsString(getLangOptions())); 553 std::string CorrectedQuotedStr(Corrected.getQuoted(getLangOptions())); 554 555 NamedDecl *FirstDecl = Corrected.getCorrectionDecl(); 556 NamedDecl *UnderlyingFirstDecl 557 = FirstDecl? FirstDecl->getUnderlyingDecl() : 0; 558 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) && 559 UnderlyingFirstDecl && isa<TemplateDecl>(UnderlyingFirstDecl)) { 560 UnqualifiedDiag = diag::err_no_template_suggest; 561 QualifiedDiag = diag::err_no_member_template_suggest; 562 } else if (UnderlyingFirstDecl && 563 (isa<TypeDecl>(UnderlyingFirstDecl) || 564 isa<ObjCInterfaceDecl>(UnderlyingFirstDecl) || 565 isa<ObjCCompatibleAliasDecl>(UnderlyingFirstDecl))) { 566 UnqualifiedDiag = diag::err_unknown_typename_suggest; 567 QualifiedDiag = diag::err_unknown_nested_typename_suggest; 568 } 569 570 if (SS.isEmpty()) 571 Diag(NameLoc, UnqualifiedDiag) 572 << Name << CorrectedQuotedStr 573 << FixItHint::CreateReplacement(NameLoc, CorrectedStr); 574 else 575 Diag(NameLoc, QualifiedDiag) 576 << Name << computeDeclContext(SS, false) << CorrectedQuotedStr 577 << SS.getRange() 578 << FixItHint::CreateReplacement(NameLoc, CorrectedStr); 579 580 // Update the name, so that the caller has the new name. 581 Name = Corrected.getCorrectionAsIdentifierInfo(); 582 583 // Also update the LookupResult... 584 // FIXME: This should probably go away at some point 585 Result.clear(); 586 Result.setLookupName(Corrected.getCorrection()); 587 if (FirstDecl) Result.addDecl(FirstDecl); 588 589 // Typo correction corrected to a keyword. 590 if (Corrected.isKeyword()) 591 return Corrected.getCorrectionAsIdentifierInfo(); 592 593 if (FirstDecl) 594 Diag(FirstDecl->getLocation(), diag::note_previous_decl) 595 << CorrectedQuotedStr; 596 597 // If we found an Objective-C instance variable, let 598 // LookupInObjCMethod build the appropriate expression to 599 // reference the ivar. 600 // FIXME: This is a gross hack. 601 if (ObjCIvarDecl *Ivar = Result.getAsSingle<ObjCIvarDecl>()) { 602 Result.clear(); 603 ExprResult E(LookupInObjCMethod(Result, S, Ivar->getIdentifier())); 604 return move(E); 605 } 606 607 goto Corrected; 608 } 609 } 610 611 // We failed to correct; just fall through and let the parser deal with it. 612 Result.suppressDiagnostics(); 613 return NameClassification::Unknown(); 614 615 case LookupResult::NotFoundInCurrentInstantiation: 616 // We performed name lookup into the current instantiation, and there were 617 // dependent bases, so we treat this result the same way as any other 618 // dependent nested-name-specifier. 619 620 // C++ [temp.res]p2: 621 // A name used in a template declaration or definition and that is 622 // dependent on a template-parameter is assumed not to name a type 623 // unless the applicable name lookup finds a type name or the name is 624 // qualified by the keyword typename. 625 // 626 // FIXME: If the next token is '<', we might want to ask the parser to 627 // perform some heroics to see if we actually have a 628 // template-argument-list, which would indicate a missing 'template' 629 // keyword here. 630 return BuildDependentDeclRefExpr(SS, NameInfo, /*TemplateArgs=*/0); 631 632 case LookupResult::Found: 633 case LookupResult::FoundOverloaded: 634 case LookupResult::FoundUnresolvedValue: 635 break; 636 637 case LookupResult::Ambiguous: 638 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) && 639 hasAnyAcceptableTemplateNames(Result)) { 640 // C++ [temp.local]p3: 641 // A lookup that finds an injected-class-name (10.2) can result in an 642 // ambiguity in certain cases (for example, if it is found in more than 643 // one base class). If all of the injected-class-names that are found 644 // refer to specializations of the same class template, and if the name 645 // is followed by a template-argument-list, the reference refers to the 646 // class template itself and not a specialization thereof, and is not 647 // ambiguous. 648 // 649 // This filtering can make an ambiguous result into an unambiguous one, 650 // so try again after filtering out template names. 651 FilterAcceptableTemplateNames(Result); 652 if (!Result.isAmbiguous()) { 653 IsFilteredTemplateName = true; 654 break; 655 } 656 } 657 658 // Diagnose the ambiguity and return an error. 659 return NameClassification::Error(); 660 } 661 662 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) && 663 (IsFilteredTemplateName || hasAnyAcceptableTemplateNames(Result))) { 664 // C++ [temp.names]p3: 665 // After name lookup (3.4) finds that a name is a template-name or that 666 // an operator-function-id or a literal- operator-id refers to a set of 667 // overloaded functions any member of which is a function template if 668 // this is followed by a <, the < is always taken as the delimiter of a 669 // template-argument-list and never as the less-than operator. 670 if (!IsFilteredTemplateName) 671 FilterAcceptableTemplateNames(Result); 672 673 if (!Result.empty()) { 674 bool IsFunctionTemplate; 675 TemplateName Template; 676 if (Result.end() - Result.begin() > 1) { 677 IsFunctionTemplate = true; 678 Template = Context.getOverloadedTemplateName(Result.begin(), 679 Result.end()); 680 } else { 681 TemplateDecl *TD 682 = cast<TemplateDecl>((*Result.begin())->getUnderlyingDecl()); 683 IsFunctionTemplate = isa<FunctionTemplateDecl>(TD); 684 685 if (SS.isSet() && !SS.isInvalid()) 686 Template = Context.getQualifiedTemplateName(SS.getScopeRep(), 687 /*TemplateKeyword=*/false, 688 TD); 689 else 690 Template = TemplateName(TD); 691 } 692 693 if (IsFunctionTemplate) { 694 // Function templates always go through overload resolution, at which 695 // point we'll perform the various checks (e.g., accessibility) we need 696 // to based on which function we selected. 697 Result.suppressDiagnostics(); 698 699 return NameClassification::FunctionTemplate(Template); 700 } 701 702 return NameClassification::TypeTemplate(Template); 703 } 704 } 705 706 NamedDecl *FirstDecl = (*Result.begin())->getUnderlyingDecl(); 707 if (TypeDecl *Type = dyn_cast<TypeDecl>(FirstDecl)) { 708 DiagnoseUseOfDecl(Type, NameLoc); 709 QualType T = Context.getTypeDeclType(Type); 710 return ParsedType::make(T); 711 } 712 713 ObjCInterfaceDecl *Class = dyn_cast<ObjCInterfaceDecl>(FirstDecl); 714 if (!Class) { 715 // FIXME: It's unfortunate that we don't have a Type node for handling this. 716 if (ObjCCompatibleAliasDecl *Alias 717 = dyn_cast<ObjCCompatibleAliasDecl>(FirstDecl)) 718 Class = Alias->getClassInterface(); 719 } 720 721 if (Class) { 722 DiagnoseUseOfDecl(Class, NameLoc); 723 724 if (NextToken.is(tok::period)) { 725 // Interface. <something> is parsed as a property reference expression. 726 // Just return "unknown" as a fall-through for now. 727 Result.suppressDiagnostics(); 728 return NameClassification::Unknown(); 729 } 730 731 QualType T = Context.getObjCInterfaceType(Class); 732 return ParsedType::make(T); 733 } 734 735 if (!Result.empty() && (*Result.begin())->isCXXClassMember()) 736 return BuildPossibleImplicitMemberExpr(SS, Result, 0); 737 738 bool ADL = UseArgumentDependentLookup(SS, Result, NextToken.is(tok::l_paren)); 739 return BuildDeclarationNameExpr(SS, Result, ADL); 740} 741 742// Determines the context to return to after temporarily entering a 743// context. This depends in an unnecessarily complicated way on the 744// exact ordering of callbacks from the parser. 745DeclContext *Sema::getContainingDC(DeclContext *DC) { 746 747 // Functions defined inline within classes aren't parsed until we've 748 // finished parsing the top-level class, so the top-level class is 749 // the context we'll need to return to. 750 if (isa<FunctionDecl>(DC)) { 751 DC = DC->getLexicalParent(); 752 753 // A function not defined within a class will always return to its 754 // lexical context. 755 if (!isa<CXXRecordDecl>(DC)) 756 return DC; 757 758 // A C++ inline method/friend is parsed *after* the topmost class 759 // it was declared in is fully parsed ("complete"); the topmost 760 // class is the context we need to return to. 761 while (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC->getLexicalParent())) 762 DC = RD; 763 764 // Return the declaration context of the topmost class the inline method is 765 // declared in. 766 return DC; 767 } 768 769 return DC->getLexicalParent(); 770} 771 772void Sema::PushDeclContext(Scope *S, DeclContext *DC) { 773 assert(getContainingDC(DC) == CurContext && 774 "The next DeclContext should be lexically contained in the current one."); 775 CurContext = DC; 776 S->setEntity(DC); 777} 778 779void Sema::PopDeclContext() { 780 assert(CurContext && "DeclContext imbalance!"); 781 782 CurContext = getContainingDC(CurContext); 783 assert(CurContext && "Popped translation unit!"); 784} 785 786/// EnterDeclaratorContext - Used when we must lookup names in the context 787/// of a declarator's nested name specifier. 788/// 789void Sema::EnterDeclaratorContext(Scope *S, DeclContext *DC) { 790 // C++0x [basic.lookup.unqual]p13: 791 // A name used in the definition of a static data member of class 792 // X (after the qualified-id of the static member) is looked up as 793 // if the name was used in a member function of X. 794 // C++0x [basic.lookup.unqual]p14: 795 // If a variable member of a namespace is defined outside of the 796 // scope of its namespace then any name used in the definition of 797 // the variable member (after the declarator-id) is looked up as 798 // if the definition of the variable member occurred in its 799 // namespace. 800 // Both of these imply that we should push a scope whose context 801 // is the semantic context of the declaration. We can't use 802 // PushDeclContext here because that context is not necessarily 803 // lexically contained in the current context. Fortunately, 804 // the containing scope should have the appropriate information. 805 806 assert(!S->getEntity() && "scope already has entity"); 807 808#ifndef NDEBUG 809 Scope *Ancestor = S->getParent(); 810 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 811 assert(Ancestor->getEntity() == CurContext && "ancestor context mismatch"); 812#endif 813 814 CurContext = DC; 815 S->setEntity(DC); 816} 817 818void Sema::ExitDeclaratorContext(Scope *S) { 819 assert(S->getEntity() == CurContext && "Context imbalance!"); 820 821 // Switch back to the lexical context. The safety of this is 822 // enforced by an assert in EnterDeclaratorContext. 823 Scope *Ancestor = S->getParent(); 824 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 825 CurContext = (DeclContext*) Ancestor->getEntity(); 826 827 // We don't need to do anything with the scope, which is going to 828 // disappear. 829} 830 831 832void Sema::ActOnReenterFunctionContext(Scope* S, Decl *D) { 833 FunctionDecl *FD = dyn_cast<FunctionDecl>(D); 834 if (FunctionTemplateDecl *TFD = dyn_cast_or_null<FunctionTemplateDecl>(D)) { 835 // We assume that the caller has already called 836 // ActOnReenterTemplateScope 837 FD = TFD->getTemplatedDecl(); 838 } 839 if (!FD) 840 return; 841 842 PushDeclContext(S, FD); 843 for (unsigned P = 0, NumParams = FD->getNumParams(); P < NumParams; ++P) { 844 ParmVarDecl *Param = FD->getParamDecl(P); 845 // If the parameter has an identifier, then add it to the scope 846 if (Param->getIdentifier()) { 847 S->AddDecl(Param); 848 IdResolver.AddDecl(Param); 849 } 850 } 851} 852 853 854/// \brief Determine whether we allow overloading of the function 855/// PrevDecl with another declaration. 856/// 857/// This routine determines whether overloading is possible, not 858/// whether some new function is actually an overload. It will return 859/// true in C++ (where we can always provide overloads) or, as an 860/// extension, in C when the previous function is already an 861/// overloaded function declaration or has the "overloadable" 862/// attribute. 863static bool AllowOverloadingOfFunction(LookupResult &Previous, 864 ASTContext &Context) { 865 if (Context.getLangOptions().CPlusPlus) 866 return true; 867 868 if (Previous.getResultKind() == LookupResult::FoundOverloaded) 869 return true; 870 871 return (Previous.getResultKind() == LookupResult::Found 872 && Previous.getFoundDecl()->hasAttr<OverloadableAttr>()); 873} 874 875/// Add this decl to the scope shadowed decl chains. 876void Sema::PushOnScopeChains(NamedDecl *D, Scope *S, bool AddToContext) { 877 // Move up the scope chain until we find the nearest enclosing 878 // non-transparent context. The declaration will be introduced into this 879 // scope. 880 while (S->getEntity() && 881 ((DeclContext *)S->getEntity())->isTransparentContext()) 882 S = S->getParent(); 883 884 // Add scoped declarations into their context, so that they can be 885 // found later. Declarations without a context won't be inserted 886 // into any context. 887 if (AddToContext) 888 CurContext->addDecl(D); 889 890 // Out-of-line definitions shouldn't be pushed into scope in C++. 891 // Out-of-line variable and function definitions shouldn't even in C. 892 if ((getLangOptions().CPlusPlus || isa<VarDecl>(D) || isa<FunctionDecl>(D)) && 893 D->isOutOfLine()) 894 return; 895 896 // Template instantiations should also not be pushed into scope. 897 if (isa<FunctionDecl>(D) && 898 cast<FunctionDecl>(D)->isFunctionTemplateSpecialization()) 899 return; 900 901 // If this replaces anything in the current scope, 902 IdentifierResolver::iterator I = IdResolver.begin(D->getDeclName()), 903 IEnd = IdResolver.end(); 904 for (; I != IEnd; ++I) { 905 if (S->isDeclScope(*I) && D->declarationReplaces(*I)) { 906 S->RemoveDecl(*I); 907 IdResolver.RemoveDecl(*I); 908 909 // Should only need to replace one decl. 910 break; 911 } 912 } 913 914 S->AddDecl(D); 915 916 if (isa<LabelDecl>(D) && !cast<LabelDecl>(D)->isGnuLocal()) { 917 // Implicitly-generated labels may end up getting generated in an order that 918 // isn't strictly lexical, which breaks name lookup. Be careful to insert 919 // the label at the appropriate place in the identifier chain. 920 for (I = IdResolver.begin(D->getDeclName()); I != IEnd; ++I) { 921 DeclContext *IDC = (*I)->getLexicalDeclContext()->getRedeclContext(); 922 if (IDC == CurContext) { 923 if (!S->isDeclScope(*I)) 924 continue; 925 } else if (IDC->Encloses(CurContext)) 926 break; 927 } 928 929 IdResolver.InsertDeclAfter(I, D); 930 } else { 931 IdResolver.AddDecl(D); 932 } 933} 934 935bool Sema::isDeclInScope(NamedDecl *&D, DeclContext *Ctx, Scope *S, 936 bool ExplicitInstantiationOrSpecialization) { 937 return IdResolver.isDeclInScope(D, Ctx, Context, S, 938 ExplicitInstantiationOrSpecialization); 939} 940 941Scope *Sema::getScopeForDeclContext(Scope *S, DeclContext *DC) { 942 DeclContext *TargetDC = DC->getPrimaryContext(); 943 do { 944 if (DeclContext *ScopeDC = (DeclContext*) S->getEntity()) 945 if (ScopeDC->getPrimaryContext() == TargetDC) 946 return S; 947 } while ((S = S->getParent())); 948 949 return 0; 950} 951 952static bool isOutOfScopePreviousDeclaration(NamedDecl *, 953 DeclContext*, 954 ASTContext&); 955 956/// Filters out lookup results that don't fall within the given scope 957/// as determined by isDeclInScope. 958void Sema::FilterLookupForScope(LookupResult &R, 959 DeclContext *Ctx, Scope *S, 960 bool ConsiderLinkage, 961 bool ExplicitInstantiationOrSpecialization) { 962 LookupResult::Filter F = R.makeFilter(); 963 while (F.hasNext()) { 964 NamedDecl *D = F.next(); 965 966 if (isDeclInScope(D, Ctx, S, ExplicitInstantiationOrSpecialization)) 967 continue; 968 969 if (ConsiderLinkage && 970 isOutOfScopePreviousDeclaration(D, Ctx, Context)) 971 continue; 972 973 F.erase(); 974 } 975 976 F.done(); 977} 978 979static bool isUsingDecl(NamedDecl *D) { 980 return isa<UsingShadowDecl>(D) || 981 isa<UnresolvedUsingTypenameDecl>(D) || 982 isa<UnresolvedUsingValueDecl>(D); 983} 984 985/// Removes using shadow declarations from the lookup results. 986static void RemoveUsingDecls(LookupResult &R) { 987 LookupResult::Filter F = R.makeFilter(); 988 while (F.hasNext()) 989 if (isUsingDecl(F.next())) 990 F.erase(); 991 992 F.done(); 993} 994 995/// \brief Check for this common pattern: 996/// @code 997/// class S { 998/// S(const S&); // DO NOT IMPLEMENT 999/// void operator=(const S&); // DO NOT IMPLEMENT 1000/// }; 1001/// @endcode 1002static bool IsDisallowedCopyOrAssign(const CXXMethodDecl *D) { 1003 // FIXME: Should check for private access too but access is set after we get 1004 // the decl here. 1005 if (D->doesThisDeclarationHaveABody()) 1006 return false; 1007 1008 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(D)) 1009 return CD->isCopyConstructor(); 1010 if (const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 1011 return Method->isCopyAssignmentOperator(); 1012 return false; 1013} 1014 1015bool Sema::ShouldWarnIfUnusedFileScopedDecl(const DeclaratorDecl *D) const { 1016 assert(D); 1017 1018 if (D->isInvalidDecl() || D->isUsed() || D->hasAttr<UnusedAttr>()) 1019 return false; 1020 1021 // Ignore class templates. 1022 if (D->getDeclContext()->isDependentContext() || 1023 D->getLexicalDeclContext()->isDependentContext()) 1024 return false; 1025 1026 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 1027 if (FD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 1028 return false; 1029 1030 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 1031 if (MD->isVirtual() || IsDisallowedCopyOrAssign(MD)) 1032 return false; 1033 } else { 1034 // 'static inline' functions are used in headers; don't warn. 1035 if (FD->getStorageClass() == SC_Static && 1036 FD->isInlineSpecified()) 1037 return false; 1038 } 1039 1040 if (FD->doesThisDeclarationHaveABody() && 1041 Context.DeclMustBeEmitted(FD)) 1042 return false; 1043 } else if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1044 if (!VD->isFileVarDecl() || 1045 VD->getType().isConstant(Context) || 1046 Context.DeclMustBeEmitted(VD)) 1047 return false; 1048 1049 if (VD->isStaticDataMember() && 1050 VD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 1051 return false; 1052 1053 } else { 1054 return false; 1055 } 1056 1057 // Only warn for unused decls internal to the translation unit. 1058 if (D->getLinkage() == ExternalLinkage) 1059 return false; 1060 1061 return true; 1062} 1063 1064void Sema::MarkUnusedFileScopedDecl(const DeclaratorDecl *D) { 1065 if (!D) 1066 return; 1067 1068 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 1069 const FunctionDecl *First = FD->getFirstDeclaration(); 1070 if (FD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 1071 return; // First should already be in the vector. 1072 } 1073 1074 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1075 const VarDecl *First = VD->getFirstDeclaration(); 1076 if (VD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 1077 return; // First should already be in the vector. 1078 } 1079 1080 if (ShouldWarnIfUnusedFileScopedDecl(D)) 1081 UnusedFileScopedDecls.push_back(D); 1082 } 1083 1084static bool ShouldDiagnoseUnusedDecl(const NamedDecl *D) { 1085 if (D->isInvalidDecl()) 1086 return false; 1087 1088 if (D->isUsed() || D->hasAttr<UnusedAttr>()) 1089 return false; 1090 1091 if (isa<LabelDecl>(D)) 1092 return true; 1093 1094 // White-list anything that isn't a local variable. 1095 if (!isa<VarDecl>(D) || isa<ParmVarDecl>(D) || isa<ImplicitParamDecl>(D) || 1096 !D->getDeclContext()->isFunctionOrMethod()) 1097 return false; 1098 1099 // Types of valid local variables should be complete, so this should succeed. 1100 if (const ValueDecl *VD = dyn_cast<ValueDecl>(D)) { 1101 1102 // White-list anything with an __attribute__((unused)) type. 1103 QualType Ty = VD->getType(); 1104 1105 // Only look at the outermost level of typedef. 1106 if (const TypedefType *TT = dyn_cast<TypedefType>(Ty)) { 1107 if (TT->getDecl()->hasAttr<UnusedAttr>()) 1108 return false; 1109 } 1110 1111 // If we failed to complete the type for some reason, or if the type is 1112 // dependent, don't diagnose the variable. 1113 if (Ty->isIncompleteType() || Ty->isDependentType()) 1114 return false; 1115 1116 if (const TagType *TT = Ty->getAs<TagType>()) { 1117 const TagDecl *Tag = TT->getDecl(); 1118 if (Tag->hasAttr<UnusedAttr>()) 1119 return false; 1120 1121 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Tag)) { 1122 // FIXME: Checking for the presence of a user-declared constructor 1123 // isn't completely accurate; we'd prefer to check that the initializer 1124 // has no side effects. 1125 if (RD->hasUserDeclaredConstructor() || !RD->hasTrivialDestructor()) 1126 return false; 1127 } 1128 } 1129 1130 // TODO: __attribute__((unused)) templates? 1131 } 1132 1133 return true; 1134} 1135 1136static void GenerateFixForUnusedDecl(const NamedDecl *D, ASTContext &Ctx, 1137 FixItHint &Hint) { 1138 if (isa<LabelDecl>(D)) { 1139 SourceLocation AfterColon = Lexer::findLocationAfterToken(D->getLocEnd(), 1140 tok::colon, Ctx.getSourceManager(), Ctx.getLangOptions(), true); 1141 if (AfterColon.isInvalid()) 1142 return; 1143 Hint = FixItHint::CreateRemoval(CharSourceRange:: 1144 getCharRange(D->getLocStart(), AfterColon)); 1145 } 1146 return; 1147} 1148 1149/// DiagnoseUnusedDecl - Emit warnings about declarations that are not used 1150/// unless they are marked attr(unused). 1151void Sema::DiagnoseUnusedDecl(const NamedDecl *D) { 1152 FixItHint Hint; 1153 if (!ShouldDiagnoseUnusedDecl(D)) 1154 return; 1155 1156 GenerateFixForUnusedDecl(D, Context, Hint); 1157 1158 unsigned DiagID; 1159 if (isa<VarDecl>(D) && cast<VarDecl>(D)->isExceptionVariable()) 1160 DiagID = diag::warn_unused_exception_param; 1161 else if (isa<LabelDecl>(D)) 1162 DiagID = diag::warn_unused_label; 1163 else 1164 DiagID = diag::warn_unused_variable; 1165 1166 Diag(D->getLocation(), DiagID) << D->getDeclName() << Hint; 1167} 1168 1169static void CheckPoppedLabel(LabelDecl *L, Sema &S) { 1170 // Verify that we have no forward references left. If so, there was a goto 1171 // or address of a label taken, but no definition of it. Label fwd 1172 // definitions are indicated with a null substmt. 1173 if (L->getStmt() == 0) 1174 S.Diag(L->getLocation(), diag::err_undeclared_label_use) <<L->getDeclName(); 1175} 1176 1177void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) { 1178 if (S->decl_empty()) return; 1179 assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) && 1180 "Scope shouldn't contain decls!"); 1181 1182 for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end(); 1183 I != E; ++I) { 1184 Decl *TmpD = (*I); 1185 assert(TmpD && "This decl didn't get pushed??"); 1186 1187 assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?"); 1188 NamedDecl *D = cast<NamedDecl>(TmpD); 1189 1190 if (!D->getDeclName()) continue; 1191 1192 // Diagnose unused variables in this scope. 1193 if (!S->hasErrorOccurred()) 1194 DiagnoseUnusedDecl(D); 1195 1196 // If this was a forward reference to a label, verify it was defined. 1197 if (LabelDecl *LD = dyn_cast<LabelDecl>(D)) 1198 CheckPoppedLabel(LD, *this); 1199 1200 // Remove this name from our lexical scope. 1201 IdResolver.RemoveDecl(D); 1202 } 1203} 1204 1205/// \brief Look for an Objective-C class in the translation unit. 1206/// 1207/// \param Id The name of the Objective-C class we're looking for. If 1208/// typo-correction fixes this name, the Id will be updated 1209/// to the fixed name. 1210/// 1211/// \param IdLoc The location of the name in the translation unit. 1212/// 1213/// \param TypoCorrection If true, this routine will attempt typo correction 1214/// if there is no class with the given name. 1215/// 1216/// \returns The declaration of the named Objective-C class, or NULL if the 1217/// class could not be found. 1218ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *&Id, 1219 SourceLocation IdLoc, 1220 bool DoTypoCorrection) { 1221 // The third "scope" argument is 0 since we aren't enabling lazy built-in 1222 // creation from this context. 1223 NamedDecl *IDecl = LookupSingleName(TUScope, Id, IdLoc, LookupOrdinaryName); 1224 1225 if (!IDecl && DoTypoCorrection) { 1226 // Perform typo correction at the given location, but only if we 1227 // find an Objective-C class name. 1228 TypoCorrection C; 1229 if ((C = CorrectTypo(DeclarationNameInfo(Id, IdLoc), LookupOrdinaryName, 1230 TUScope, NULL, NULL, false, CTC_NoKeywords)) && 1231 (IDecl = C.getCorrectionDeclAs<ObjCInterfaceDecl>())) { 1232 Diag(IdLoc, diag::err_undef_interface_suggest) 1233 << Id << IDecl->getDeclName() 1234 << FixItHint::CreateReplacement(IdLoc, IDecl->getNameAsString()); 1235 Diag(IDecl->getLocation(), diag::note_previous_decl) 1236 << IDecl->getDeclName(); 1237 1238 Id = IDecl->getIdentifier(); 1239 } 1240 } 1241 1242 return dyn_cast_or_null<ObjCInterfaceDecl>(IDecl); 1243} 1244 1245/// getNonFieldDeclScope - Retrieves the innermost scope, starting 1246/// from S, where a non-field would be declared. This routine copes 1247/// with the difference between C and C++ scoping rules in structs and 1248/// unions. For example, the following code is well-formed in C but 1249/// ill-formed in C++: 1250/// @code 1251/// struct S6 { 1252/// enum { BAR } e; 1253/// }; 1254/// 1255/// void test_S6() { 1256/// struct S6 a; 1257/// a.e = BAR; 1258/// } 1259/// @endcode 1260/// For the declaration of BAR, this routine will return a different 1261/// scope. The scope S will be the scope of the unnamed enumeration 1262/// within S6. In C++, this routine will return the scope associated 1263/// with S6, because the enumeration's scope is a transparent 1264/// context but structures can contain non-field names. In C, this 1265/// routine will return the translation unit scope, since the 1266/// enumeration's scope is a transparent context and structures cannot 1267/// contain non-field names. 1268Scope *Sema::getNonFieldDeclScope(Scope *S) { 1269 while (((S->getFlags() & Scope::DeclScope) == 0) || 1270 (S->getEntity() && 1271 ((DeclContext *)S->getEntity())->isTransparentContext()) || 1272 (S->isClassScope() && !getLangOptions().CPlusPlus)) 1273 S = S->getParent(); 1274 return S; 1275} 1276 1277/// LazilyCreateBuiltin - The specified Builtin-ID was first used at 1278/// file scope. lazily create a decl for it. ForRedeclaration is true 1279/// if we're creating this built-in in anticipation of redeclaring the 1280/// built-in. 1281NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid, 1282 Scope *S, bool ForRedeclaration, 1283 SourceLocation Loc) { 1284 Builtin::ID BID = (Builtin::ID)bid; 1285 1286 ASTContext::GetBuiltinTypeError Error; 1287 QualType R = Context.GetBuiltinType(BID, Error); 1288 switch (Error) { 1289 case ASTContext::GE_None: 1290 // Okay 1291 break; 1292 1293 case ASTContext::GE_Missing_stdio: 1294 if (ForRedeclaration) 1295 Diag(Loc, diag::warn_implicit_decl_requires_stdio) 1296 << Context.BuiltinInfo.GetName(BID); 1297 return 0; 1298 1299 case ASTContext::GE_Missing_setjmp: 1300 if (ForRedeclaration) 1301 Diag(Loc, diag::warn_implicit_decl_requires_setjmp) 1302 << Context.BuiltinInfo.GetName(BID); 1303 return 0; 1304 } 1305 1306 if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) { 1307 Diag(Loc, diag::ext_implicit_lib_function_decl) 1308 << Context.BuiltinInfo.GetName(BID) 1309 << R; 1310 if (Context.BuiltinInfo.getHeaderName(BID) && 1311 Diags.getDiagnosticLevel(diag::ext_implicit_lib_function_decl, Loc) 1312 != DiagnosticsEngine::Ignored) 1313 Diag(Loc, diag::note_please_include_header) 1314 << Context.BuiltinInfo.getHeaderName(BID) 1315 << Context.BuiltinInfo.GetName(BID); 1316 } 1317 1318 FunctionDecl *New = FunctionDecl::Create(Context, 1319 Context.getTranslationUnitDecl(), 1320 Loc, Loc, II, R, /*TInfo=*/0, 1321 SC_Extern, 1322 SC_None, false, 1323 /*hasPrototype=*/true); 1324 New->setImplicit(); 1325 1326 // Create Decl objects for each parameter, adding them to the 1327 // FunctionDecl. 1328 if (const FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) { 1329 SmallVector<ParmVarDecl*, 16> Params; 1330 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) { 1331 ParmVarDecl *parm = 1332 ParmVarDecl::Create(Context, New, SourceLocation(), 1333 SourceLocation(), 0, 1334 FT->getArgType(i), /*TInfo=*/0, 1335 SC_None, SC_None, 0); 1336 parm->setScopeInfo(0, i); 1337 Params.push_back(parm); 1338 } 1339 New->setParams(Params); 1340 } 1341 1342 AddKnownFunctionAttributes(New); 1343 1344 // TUScope is the translation-unit scope to insert this function into. 1345 // FIXME: This is hideous. We need to teach PushOnScopeChains to 1346 // relate Scopes to DeclContexts, and probably eliminate CurContext 1347 // entirely, but we're not there yet. 1348 DeclContext *SavedContext = CurContext; 1349 CurContext = Context.getTranslationUnitDecl(); 1350 PushOnScopeChains(New, TUScope); 1351 CurContext = SavedContext; 1352 return New; 1353} 1354 1355/// MergeTypedefNameDecl - We just parsed a typedef 'New' which has the 1356/// same name and scope as a previous declaration 'Old'. Figure out 1357/// how to resolve this situation, merging decls or emitting 1358/// diagnostics as appropriate. If there was an error, set New to be invalid. 1359/// 1360void Sema::MergeTypedefNameDecl(TypedefNameDecl *New, LookupResult &OldDecls) { 1361 // If the new decl is known invalid already, don't bother doing any 1362 // merging checks. 1363 if (New->isInvalidDecl()) return; 1364 1365 // Allow multiple definitions for ObjC built-in typedefs. 1366 // FIXME: Verify the underlying types are equivalent! 1367 if (getLangOptions().ObjC1) { 1368 const IdentifierInfo *TypeID = New->getIdentifier(); 1369 switch (TypeID->getLength()) { 1370 default: break; 1371 case 2: 1372 if (!TypeID->isStr("id")) 1373 break; 1374 Context.setObjCIdRedefinitionType(New->getUnderlyingType()); 1375 // Install the built-in type for 'id', ignoring the current definition. 1376 New->setTypeForDecl(Context.getObjCIdType().getTypePtr()); 1377 return; 1378 case 5: 1379 if (!TypeID->isStr("Class")) 1380 break; 1381 Context.setObjCClassRedefinitionType(New->getUnderlyingType()); 1382 // Install the built-in type for 'Class', ignoring the current definition. 1383 New->setTypeForDecl(Context.getObjCClassType().getTypePtr()); 1384 return; 1385 case 3: 1386 if (!TypeID->isStr("SEL")) 1387 break; 1388 Context.setObjCSelRedefinitionType(New->getUnderlyingType()); 1389 // Install the built-in type for 'SEL', ignoring the current definition. 1390 New->setTypeForDecl(Context.getObjCSelType().getTypePtr()); 1391 return; 1392 } 1393 // Fall through - the typedef name was not a builtin type. 1394 } 1395 1396 // Verify the old decl was also a type. 1397 TypeDecl *Old = OldDecls.getAsSingle<TypeDecl>(); 1398 if (!Old) { 1399 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1400 << New->getDeclName(); 1401 1402 NamedDecl *OldD = OldDecls.getRepresentativeDecl(); 1403 if (OldD->getLocation().isValid()) 1404 Diag(OldD->getLocation(), diag::note_previous_definition); 1405 1406 return New->setInvalidDecl(); 1407 } 1408 1409 // If the old declaration is invalid, just give up here. 1410 if (Old->isInvalidDecl()) 1411 return New->setInvalidDecl(); 1412 1413 // Determine the "old" type we'll use for checking and diagnostics. 1414 QualType OldType; 1415 if (TypedefNameDecl *OldTypedef = dyn_cast<TypedefNameDecl>(Old)) 1416 OldType = OldTypedef->getUnderlyingType(); 1417 else 1418 OldType = Context.getTypeDeclType(Old); 1419 1420 // If the typedef types are not identical, reject them in all languages and 1421 // with any extensions enabled. 1422 1423 if (OldType != New->getUnderlyingType() && 1424 Context.getCanonicalType(OldType) != 1425 Context.getCanonicalType(New->getUnderlyingType())) { 1426 int Kind = 0; 1427 if (isa<TypeAliasDecl>(Old)) 1428 Kind = 1; 1429 Diag(New->getLocation(), diag::err_redefinition_different_typedef) 1430 << Kind << New->getUnderlyingType() << OldType; 1431 if (Old->getLocation().isValid()) 1432 Diag(Old->getLocation(), diag::note_previous_definition); 1433 return New->setInvalidDecl(); 1434 } 1435 1436 // The types match. Link up the redeclaration chain if the old 1437 // declaration was a typedef. 1438 // FIXME: this is a potential source of weirdness if the type 1439 // spellings don't match exactly. 1440 if (TypedefNameDecl *Typedef = dyn_cast<TypedefNameDecl>(Old)) 1441 New->setPreviousDeclaration(Typedef); 1442 1443 // __module_private__ is propagated to later declarations. 1444 if (Old->isModulePrivate()) 1445 New->setModulePrivate(); 1446 else if (New->isModulePrivate()) 1447 diagnoseModulePrivateRedeclaration(New, Old); 1448 1449 if (getLangOptions().MicrosoftExt) 1450 return; 1451 1452 if (getLangOptions().CPlusPlus) { 1453 // C++ [dcl.typedef]p2: 1454 // In a given non-class scope, a typedef specifier can be used to 1455 // redefine the name of any type declared in that scope to refer 1456 // to the type to which it already refers. 1457 if (!isa<CXXRecordDecl>(CurContext)) 1458 return; 1459 1460 // C++0x [dcl.typedef]p4: 1461 // In a given class scope, a typedef specifier can be used to redefine 1462 // any class-name declared in that scope that is not also a typedef-name 1463 // to refer to the type to which it already refers. 1464 // 1465 // This wording came in via DR424, which was a correction to the 1466 // wording in DR56, which accidentally banned code like: 1467 // 1468 // struct S { 1469 // typedef struct A { } A; 1470 // }; 1471 // 1472 // in the C++03 standard. We implement the C++0x semantics, which 1473 // allow the above but disallow 1474 // 1475 // struct S { 1476 // typedef int I; 1477 // typedef int I; 1478 // }; 1479 // 1480 // since that was the intent of DR56. 1481 if (!isa<TypedefNameDecl>(Old)) 1482 return; 1483 1484 Diag(New->getLocation(), diag::err_redefinition) 1485 << New->getDeclName(); 1486 Diag(Old->getLocation(), diag::note_previous_definition); 1487 return New->setInvalidDecl(); 1488 } 1489 1490 // If we have a redefinition of a typedef in C, emit a warning. This warning 1491 // is normally mapped to an error, but can be controlled with 1492 // -Wtypedef-redefinition. If either the original or the redefinition is 1493 // in a system header, don't emit this for compatibility with GCC. 1494 if (getDiagnostics().getSuppressSystemWarnings() && 1495 (Context.getSourceManager().isInSystemHeader(Old->getLocation()) || 1496 Context.getSourceManager().isInSystemHeader(New->getLocation()))) 1497 return; 1498 1499 Diag(New->getLocation(), diag::warn_redefinition_of_typedef) 1500 << New->getDeclName(); 1501 Diag(Old->getLocation(), diag::note_previous_definition); 1502 return; 1503} 1504 1505/// DeclhasAttr - returns true if decl Declaration already has the target 1506/// attribute. 1507static bool 1508DeclHasAttr(const Decl *D, const Attr *A) { 1509 const OwnershipAttr *OA = dyn_cast<OwnershipAttr>(A); 1510 const AnnotateAttr *Ann = dyn_cast<AnnotateAttr>(A); 1511 for (Decl::attr_iterator i = D->attr_begin(), e = D->attr_end(); i != e; ++i) 1512 if ((*i)->getKind() == A->getKind()) { 1513 if (Ann) { 1514 if (Ann->getAnnotation() == cast<AnnotateAttr>(*i)->getAnnotation()) 1515 return true; 1516 continue; 1517 } 1518 // FIXME: Don't hardcode this check 1519 if (OA && isa<OwnershipAttr>(*i)) 1520 return OA->getOwnKind() == cast<OwnershipAttr>(*i)->getOwnKind(); 1521 return true; 1522 } 1523 1524 return false; 1525} 1526 1527/// mergeDeclAttributes - Copy attributes from the Old decl to the New one. 1528static void mergeDeclAttributes(Decl *newDecl, const Decl *oldDecl, 1529 ASTContext &C, bool mergeDeprecation = true) { 1530 if (!oldDecl->hasAttrs()) 1531 return; 1532 1533 bool foundAny = newDecl->hasAttrs(); 1534 1535 // Ensure that any moving of objects within the allocated map is done before 1536 // we process them. 1537 if (!foundAny) newDecl->setAttrs(AttrVec()); 1538 1539 for (specific_attr_iterator<InheritableAttr> 1540 i = oldDecl->specific_attr_begin<InheritableAttr>(), 1541 e = oldDecl->specific_attr_end<InheritableAttr>(); i != e; ++i) { 1542 // Ignore deprecated/unavailable/availability attributes if requested. 1543 if (!mergeDeprecation && 1544 (isa<DeprecatedAttr>(*i) || 1545 isa<UnavailableAttr>(*i) || 1546 isa<AvailabilityAttr>(*i))) 1547 continue; 1548 1549 if (!DeclHasAttr(newDecl, *i)) { 1550 InheritableAttr *newAttr = cast<InheritableAttr>((*i)->clone(C)); 1551 newAttr->setInherited(true); 1552 newDecl->addAttr(newAttr); 1553 foundAny = true; 1554 } 1555 } 1556 1557 if (!foundAny) newDecl->dropAttrs(); 1558} 1559 1560/// mergeParamDeclAttributes - Copy attributes from the old parameter 1561/// to the new one. 1562static void mergeParamDeclAttributes(ParmVarDecl *newDecl, 1563 const ParmVarDecl *oldDecl, 1564 ASTContext &C) { 1565 if (!oldDecl->hasAttrs()) 1566 return; 1567 1568 bool foundAny = newDecl->hasAttrs(); 1569 1570 // Ensure that any moving of objects within the allocated map is 1571 // done before we process them. 1572 if (!foundAny) newDecl->setAttrs(AttrVec()); 1573 1574 for (specific_attr_iterator<InheritableParamAttr> 1575 i = oldDecl->specific_attr_begin<InheritableParamAttr>(), 1576 e = oldDecl->specific_attr_end<InheritableParamAttr>(); i != e; ++i) { 1577 if (!DeclHasAttr(newDecl, *i)) { 1578 InheritableAttr *newAttr = cast<InheritableParamAttr>((*i)->clone(C)); 1579 newAttr->setInherited(true); 1580 newDecl->addAttr(newAttr); 1581 foundAny = true; 1582 } 1583 } 1584 1585 if (!foundAny) newDecl->dropAttrs(); 1586} 1587 1588namespace { 1589 1590/// Used in MergeFunctionDecl to keep track of function parameters in 1591/// C. 1592struct GNUCompatibleParamWarning { 1593 ParmVarDecl *OldParm; 1594 ParmVarDecl *NewParm; 1595 QualType PromotedType; 1596}; 1597 1598} 1599 1600/// getSpecialMember - get the special member enum for a method. 1601Sema::CXXSpecialMember Sema::getSpecialMember(const CXXMethodDecl *MD) { 1602 if (const CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(MD)) { 1603 if (Ctor->isDefaultConstructor()) 1604 return Sema::CXXDefaultConstructor; 1605 1606 if (Ctor->isCopyConstructor()) 1607 return Sema::CXXCopyConstructor; 1608 1609 if (Ctor->isMoveConstructor()) 1610 return Sema::CXXMoveConstructor; 1611 } else if (isa<CXXDestructorDecl>(MD)) { 1612 return Sema::CXXDestructor; 1613 } else if (MD->isCopyAssignmentOperator()) { 1614 return Sema::CXXCopyAssignment; 1615 } else if (MD->isMoveAssignmentOperator()) { 1616 return Sema::CXXMoveAssignment; 1617 } 1618 1619 return Sema::CXXInvalid; 1620} 1621 1622/// canRedefineFunction - checks if a function can be redefined. Currently, 1623/// only extern inline functions can be redefined, and even then only in 1624/// GNU89 mode. 1625static bool canRedefineFunction(const FunctionDecl *FD, 1626 const LangOptions& LangOpts) { 1627 return ((FD->hasAttr<GNUInlineAttr>() || LangOpts.GNUInline) && 1628 !LangOpts.CPlusPlus && 1629 FD->isInlineSpecified() && 1630 FD->getStorageClass() == SC_Extern); 1631} 1632 1633/// MergeFunctionDecl - We just parsed a function 'New' from 1634/// declarator D which has the same name and scope as a previous 1635/// declaration 'Old'. Figure out how to resolve this situation, 1636/// merging decls or emitting diagnostics as appropriate. 1637/// 1638/// In C++, New and Old must be declarations that are not 1639/// overloaded. Use IsOverload to determine whether New and Old are 1640/// overloaded, and to select the Old declaration that New should be 1641/// merged with. 1642/// 1643/// Returns true if there was an error, false otherwise. 1644bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD) { 1645 // Verify the old decl was also a function. 1646 FunctionDecl *Old = 0; 1647 if (FunctionTemplateDecl *OldFunctionTemplate 1648 = dyn_cast<FunctionTemplateDecl>(OldD)) 1649 Old = OldFunctionTemplate->getTemplatedDecl(); 1650 else 1651 Old = dyn_cast<FunctionDecl>(OldD); 1652 if (!Old) { 1653 if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(OldD)) { 1654 Diag(New->getLocation(), diag::err_using_decl_conflict_reverse); 1655 Diag(Shadow->getTargetDecl()->getLocation(), 1656 diag::note_using_decl_target); 1657 Diag(Shadow->getUsingDecl()->getLocation(), 1658 diag::note_using_decl) << 0; 1659 return true; 1660 } 1661 1662 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1663 << New->getDeclName(); 1664 Diag(OldD->getLocation(), diag::note_previous_definition); 1665 return true; 1666 } 1667 1668 // Determine whether the previous declaration was a definition, 1669 // implicit declaration, or a declaration. 1670 diag::kind PrevDiag; 1671 if (Old->isThisDeclarationADefinition()) 1672 PrevDiag = diag::note_previous_definition; 1673 else if (Old->isImplicit()) 1674 PrevDiag = diag::note_previous_implicit_declaration; 1675 else 1676 PrevDiag = diag::note_previous_declaration; 1677 1678 QualType OldQType = Context.getCanonicalType(Old->getType()); 1679 QualType NewQType = Context.getCanonicalType(New->getType()); 1680 1681 // Don't complain about this if we're in GNU89 mode and the old function 1682 // is an extern inline function. 1683 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) && 1684 New->getStorageClass() == SC_Static && 1685 Old->getStorageClass() != SC_Static && 1686 !canRedefineFunction(Old, getLangOptions())) { 1687 if (getLangOptions().MicrosoftExt) { 1688 Diag(New->getLocation(), diag::warn_static_non_static) << New; 1689 Diag(Old->getLocation(), PrevDiag); 1690 } else { 1691 Diag(New->getLocation(), diag::err_static_non_static) << New; 1692 Diag(Old->getLocation(), PrevDiag); 1693 return true; 1694 } 1695 } 1696 1697 // If a function is first declared with a calling convention, but is 1698 // later declared or defined without one, the second decl assumes the 1699 // calling convention of the first. 1700 // 1701 // For the new decl, we have to look at the NON-canonical type to tell the 1702 // difference between a function that really doesn't have a calling 1703 // convention and one that is declared cdecl. That's because in 1704 // canonicalization (see ASTContext.cpp), cdecl is canonicalized away 1705 // because it is the default calling convention. 1706 // 1707 // Note also that we DO NOT return at this point, because we still have 1708 // other tests to run. 1709 const FunctionType *OldType = cast<FunctionType>(OldQType); 1710 const FunctionType *NewType = New->getType()->getAs<FunctionType>(); 1711 FunctionType::ExtInfo OldTypeInfo = OldType->getExtInfo(); 1712 FunctionType::ExtInfo NewTypeInfo = NewType->getExtInfo(); 1713 bool RequiresAdjustment = false; 1714 if (OldTypeInfo.getCC() != CC_Default && 1715 NewTypeInfo.getCC() == CC_Default) { 1716 NewTypeInfo = NewTypeInfo.withCallingConv(OldTypeInfo.getCC()); 1717 RequiresAdjustment = true; 1718 } else if (!Context.isSameCallConv(OldTypeInfo.getCC(), 1719 NewTypeInfo.getCC())) { 1720 // Calling conventions really aren't compatible, so complain. 1721 Diag(New->getLocation(), diag::err_cconv_change) 1722 << FunctionType::getNameForCallConv(NewTypeInfo.getCC()) 1723 << (OldTypeInfo.getCC() == CC_Default) 1724 << (OldTypeInfo.getCC() == CC_Default ? "" : 1725 FunctionType::getNameForCallConv(OldTypeInfo.getCC())); 1726 Diag(Old->getLocation(), diag::note_previous_declaration); 1727 return true; 1728 } 1729 1730 // FIXME: diagnose the other way around? 1731 if (OldTypeInfo.getNoReturn() && !NewTypeInfo.getNoReturn()) { 1732 NewTypeInfo = NewTypeInfo.withNoReturn(true); 1733 RequiresAdjustment = true; 1734 } 1735 1736 // Merge regparm attribute. 1737 if (OldTypeInfo.getHasRegParm() != NewTypeInfo.getHasRegParm() || 1738 OldTypeInfo.getRegParm() != NewTypeInfo.getRegParm()) { 1739 if (NewTypeInfo.getHasRegParm()) { 1740 Diag(New->getLocation(), diag::err_regparm_mismatch) 1741 << NewType->getRegParmType() 1742 << OldType->getRegParmType(); 1743 Diag(Old->getLocation(), diag::note_previous_declaration); 1744 return true; 1745 } 1746 1747 NewTypeInfo = NewTypeInfo.withRegParm(OldTypeInfo.getRegParm()); 1748 RequiresAdjustment = true; 1749 } 1750 1751 if (RequiresAdjustment) { 1752 NewType = Context.adjustFunctionType(NewType, NewTypeInfo); 1753 New->setType(QualType(NewType, 0)); 1754 NewQType = Context.getCanonicalType(New->getType()); 1755 } 1756 1757 if (getLangOptions().CPlusPlus) { 1758 // (C++98 13.1p2): 1759 // Certain function declarations cannot be overloaded: 1760 // -- Function declarations that differ only in the return type 1761 // cannot be overloaded. 1762 QualType OldReturnType = OldType->getResultType(); 1763 QualType NewReturnType = cast<FunctionType>(NewQType)->getResultType(); 1764 QualType ResQT; 1765 if (OldReturnType != NewReturnType) { 1766 if (NewReturnType->isObjCObjectPointerType() 1767 && OldReturnType->isObjCObjectPointerType()) 1768 ResQT = Context.mergeObjCGCQualifiers(NewQType, OldQType); 1769 if (ResQT.isNull()) { 1770 if (New->isCXXClassMember() && New->isOutOfLine()) 1771 Diag(New->getLocation(), 1772 diag::err_member_def_does_not_match_ret_type) << New; 1773 else 1774 Diag(New->getLocation(), diag::err_ovl_diff_return_type); 1775 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1776 return true; 1777 } 1778 else 1779 NewQType = ResQT; 1780 } 1781 1782 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 1783 CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 1784 if (OldMethod && NewMethod) { 1785 // Preserve triviality. 1786 NewMethod->setTrivial(OldMethod->isTrivial()); 1787 1788 // MSVC allows explicit template specialization at class scope: 1789 // 2 CXMethodDecls referring to the same function will be injected. 1790 // We don't want a redeclartion error. 1791 bool IsClassScopeExplicitSpecialization = 1792 OldMethod->isFunctionTemplateSpecialization() && 1793 NewMethod->isFunctionTemplateSpecialization(); 1794 bool isFriend = NewMethod->getFriendObjectKind(); 1795 1796 if (!isFriend && NewMethod->getLexicalDeclContext()->isRecord() && 1797 !IsClassScopeExplicitSpecialization) { 1798 // -- Member function declarations with the same name and the 1799 // same parameter types cannot be overloaded if any of them 1800 // is a static member function declaration. 1801 if (OldMethod->isStatic() || NewMethod->isStatic()) { 1802 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 1803 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1804 return true; 1805 } 1806 1807 // C++ [class.mem]p1: 1808 // [...] A member shall not be declared twice in the 1809 // member-specification, except that a nested class or member 1810 // class template can be declared and then later defined. 1811 unsigned NewDiag; 1812 if (isa<CXXConstructorDecl>(OldMethod)) 1813 NewDiag = diag::err_constructor_redeclared; 1814 else if (isa<CXXDestructorDecl>(NewMethod)) 1815 NewDiag = diag::err_destructor_redeclared; 1816 else if (isa<CXXConversionDecl>(NewMethod)) 1817 NewDiag = diag::err_conv_function_redeclared; 1818 else 1819 NewDiag = diag::err_member_redeclared; 1820 1821 Diag(New->getLocation(), NewDiag); 1822 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1823 1824 // Complain if this is an explicit declaration of a special 1825 // member that was initially declared implicitly. 1826 // 1827 // As an exception, it's okay to befriend such methods in order 1828 // to permit the implicit constructor/destructor/operator calls. 1829 } else if (OldMethod->isImplicit()) { 1830 if (isFriend) { 1831 NewMethod->setImplicit(); 1832 } else { 1833 Diag(NewMethod->getLocation(), 1834 diag::err_definition_of_implicitly_declared_member) 1835 << New << getSpecialMember(OldMethod); 1836 return true; 1837 } 1838 } else if (OldMethod->isExplicitlyDefaulted()) { 1839 Diag(NewMethod->getLocation(), 1840 diag::err_definition_of_explicitly_defaulted_member) 1841 << getSpecialMember(OldMethod); 1842 return true; 1843 } 1844 } 1845 1846 // (C++98 8.3.5p3): 1847 // All declarations for a function shall agree exactly in both the 1848 // return type and the parameter-type-list. 1849 // We also want to respect all the extended bits except noreturn. 1850 1851 // noreturn should now match unless the old type info didn't have it. 1852 QualType OldQTypeForComparison = OldQType; 1853 if (!OldTypeInfo.getNoReturn() && NewTypeInfo.getNoReturn()) { 1854 assert(OldQType == QualType(OldType, 0)); 1855 const FunctionType *OldTypeForComparison 1856 = Context.adjustFunctionType(OldType, OldTypeInfo.withNoReturn(true)); 1857 OldQTypeForComparison = QualType(OldTypeForComparison, 0); 1858 assert(OldQTypeForComparison.isCanonical()); 1859 } 1860 1861 if (OldQTypeForComparison == NewQType) 1862 return MergeCompatibleFunctionDecls(New, Old); 1863 1864 // Fall through for conflicting redeclarations and redefinitions. 1865 } 1866 1867 // C: Function types need to be compatible, not identical. This handles 1868 // duplicate function decls like "void f(int); void f(enum X);" properly. 1869 if (!getLangOptions().CPlusPlus && 1870 Context.typesAreCompatible(OldQType, NewQType)) { 1871 const FunctionType *OldFuncType = OldQType->getAs<FunctionType>(); 1872 const FunctionType *NewFuncType = NewQType->getAs<FunctionType>(); 1873 const FunctionProtoType *OldProto = 0; 1874 if (isa<FunctionNoProtoType>(NewFuncType) && 1875 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) { 1876 // The old declaration provided a function prototype, but the 1877 // new declaration does not. Merge in the prototype. 1878 assert(!OldProto->hasExceptionSpec() && "Exception spec in C"); 1879 SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(), 1880 OldProto->arg_type_end()); 1881 NewQType = Context.getFunctionType(NewFuncType->getResultType(), 1882 ParamTypes.data(), ParamTypes.size(), 1883 OldProto->getExtProtoInfo()); 1884 New->setType(NewQType); 1885 New->setHasInheritedPrototype(); 1886 1887 // Synthesize a parameter for each argument type. 1888 SmallVector<ParmVarDecl*, 16> Params; 1889 for (FunctionProtoType::arg_type_iterator 1890 ParamType = OldProto->arg_type_begin(), 1891 ParamEnd = OldProto->arg_type_end(); 1892 ParamType != ParamEnd; ++ParamType) { 1893 ParmVarDecl *Param = ParmVarDecl::Create(Context, New, 1894 SourceLocation(), 1895 SourceLocation(), 0, 1896 *ParamType, /*TInfo=*/0, 1897 SC_None, SC_None, 1898 0); 1899 Param->setScopeInfo(0, Params.size()); 1900 Param->setImplicit(); 1901 Params.push_back(Param); 1902 } 1903 1904 New->setParams(Params); 1905 } 1906 1907 return MergeCompatibleFunctionDecls(New, Old); 1908 } 1909 1910 // GNU C permits a K&R definition to follow a prototype declaration 1911 // if the declared types of the parameters in the K&R definition 1912 // match the types in the prototype declaration, even when the 1913 // promoted types of the parameters from the K&R definition differ 1914 // from the types in the prototype. GCC then keeps the types from 1915 // the prototype. 1916 // 1917 // If a variadic prototype is followed by a non-variadic K&R definition, 1918 // the K&R definition becomes variadic. This is sort of an edge case, but 1919 // it's legal per the standard depending on how you read C99 6.7.5.3p15 and 1920 // C99 6.9.1p8. 1921 if (!getLangOptions().CPlusPlus && 1922 Old->hasPrototype() && !New->hasPrototype() && 1923 New->getType()->getAs<FunctionProtoType>() && 1924 Old->getNumParams() == New->getNumParams()) { 1925 SmallVector<QualType, 16> ArgTypes; 1926 SmallVector<GNUCompatibleParamWarning, 16> Warnings; 1927 const FunctionProtoType *OldProto 1928 = Old->getType()->getAs<FunctionProtoType>(); 1929 const FunctionProtoType *NewProto 1930 = New->getType()->getAs<FunctionProtoType>(); 1931 1932 // Determine whether this is the GNU C extension. 1933 QualType MergedReturn = Context.mergeTypes(OldProto->getResultType(), 1934 NewProto->getResultType()); 1935 bool LooseCompatible = !MergedReturn.isNull(); 1936 for (unsigned Idx = 0, End = Old->getNumParams(); 1937 LooseCompatible && Idx != End; ++Idx) { 1938 ParmVarDecl *OldParm = Old->getParamDecl(Idx); 1939 ParmVarDecl *NewParm = New->getParamDecl(Idx); 1940 if (Context.typesAreCompatible(OldParm->getType(), 1941 NewProto->getArgType(Idx))) { 1942 ArgTypes.push_back(NewParm->getType()); 1943 } else if (Context.typesAreCompatible(OldParm->getType(), 1944 NewParm->getType(), 1945 /*CompareUnqualified=*/true)) { 1946 GNUCompatibleParamWarning Warn 1947 = { OldParm, NewParm, NewProto->getArgType(Idx) }; 1948 Warnings.push_back(Warn); 1949 ArgTypes.push_back(NewParm->getType()); 1950 } else 1951 LooseCompatible = false; 1952 } 1953 1954 if (LooseCompatible) { 1955 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) { 1956 Diag(Warnings[Warn].NewParm->getLocation(), 1957 diag::ext_param_promoted_not_compatible_with_prototype) 1958 << Warnings[Warn].PromotedType 1959 << Warnings[Warn].OldParm->getType(); 1960 if (Warnings[Warn].OldParm->getLocation().isValid()) 1961 Diag(Warnings[Warn].OldParm->getLocation(), 1962 diag::note_previous_declaration); 1963 } 1964 1965 New->setType(Context.getFunctionType(MergedReturn, &ArgTypes[0], 1966 ArgTypes.size(), 1967 OldProto->getExtProtoInfo())); 1968 return MergeCompatibleFunctionDecls(New, Old); 1969 } 1970 1971 // Fall through to diagnose conflicting types. 1972 } 1973 1974 // A function that has already been declared has been redeclared or defined 1975 // with a different type- show appropriate diagnostic 1976 if (unsigned BuiltinID = Old->getBuiltinID()) { 1977 // The user has declared a builtin function with an incompatible 1978 // signature. 1979 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 1980 // The function the user is redeclaring is a library-defined 1981 // function like 'malloc' or 'printf'. Warn about the 1982 // redeclaration, then pretend that we don't know about this 1983 // library built-in. 1984 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; 1985 Diag(Old->getLocation(), diag::note_previous_builtin_declaration) 1986 << Old << Old->getType(); 1987 New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin); 1988 Old->setInvalidDecl(); 1989 return false; 1990 } 1991 1992 PrevDiag = diag::note_previous_builtin_declaration; 1993 } 1994 1995 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 1996 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1997 return true; 1998} 1999 2000/// \brief Completes the merge of two function declarations that are 2001/// known to be compatible. 2002/// 2003/// This routine handles the merging of attributes and other 2004/// properties of function declarations form the old declaration to 2005/// the new declaration, once we know that New is in fact a 2006/// redeclaration of Old. 2007/// 2008/// \returns false 2009bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old) { 2010 // Merge the attributes 2011 mergeDeclAttributes(New, Old, Context); 2012 2013 // Merge the storage class. 2014 if (Old->getStorageClass() != SC_Extern && 2015 Old->getStorageClass() != SC_None) 2016 New->setStorageClass(Old->getStorageClass()); 2017 2018 // Merge "pure" flag. 2019 if (Old->isPure()) 2020 New->setPure(); 2021 2022 // __module_private__ is propagated to later declarations. 2023 if (Old->isModulePrivate()) 2024 New->setModulePrivate(); 2025 else if (New->isModulePrivate()) 2026 diagnoseModulePrivateRedeclaration(New, Old); 2027 2028 // Merge attributes from the parameters. These can mismatch with K&R 2029 // declarations. 2030 if (New->getNumParams() == Old->getNumParams()) 2031 for (unsigned i = 0, e = New->getNumParams(); i != e; ++i) 2032 mergeParamDeclAttributes(New->getParamDecl(i), Old->getParamDecl(i), 2033 Context); 2034 2035 if (getLangOptions().CPlusPlus) 2036 return MergeCXXFunctionDecl(New, Old); 2037 2038 return false; 2039} 2040 2041 2042void Sema::mergeObjCMethodDecls(ObjCMethodDecl *newMethod, 2043 const ObjCMethodDecl *oldMethod) { 2044 // We don't want to merge unavailable and deprecated attributes 2045 // except from interface to implementation. 2046 bool mergeDeprecation = isa<ObjCImplDecl>(newMethod->getDeclContext()); 2047 2048 // Merge the attributes. 2049 mergeDeclAttributes(newMethod, oldMethod, Context, mergeDeprecation); 2050 2051 // Merge attributes from the parameters. 2052 for (ObjCMethodDecl::param_iterator oi = oldMethod->param_begin(), 2053 ni = newMethod->param_begin(), ne = newMethod->param_end(); 2054 ni != ne; ++ni, ++oi) 2055 mergeParamDeclAttributes(*ni, *oi, Context); 2056 2057 CheckObjCMethodOverride(newMethod, oldMethod, true); 2058} 2059 2060/// MergeVarDeclTypes - We parsed a variable 'New' which has the same name and 2061/// scope as a previous declaration 'Old'. Figure out how to merge their types, 2062/// emitting diagnostics as appropriate. 2063/// 2064/// Declarations using the auto type specifier (C++ [decl.spec.auto]) call back 2065/// to here in AddInitializerToDecl and AddCXXDirectInitializerToDecl. We can't 2066/// check them before the initializer is attached. 2067/// 2068void Sema::MergeVarDeclTypes(VarDecl *New, VarDecl *Old) { 2069 if (New->isInvalidDecl() || Old->isInvalidDecl()) 2070 return; 2071 2072 QualType MergedT; 2073 if (getLangOptions().CPlusPlus) { 2074 AutoType *AT = New->getType()->getContainedAutoType(); 2075 if (AT && !AT->isDeduced()) { 2076 // We don't know what the new type is until the initializer is attached. 2077 return; 2078 } else if (Context.hasSameType(New->getType(), Old->getType())) { 2079 // These could still be something that needs exception specs checked. 2080 return MergeVarDeclExceptionSpecs(New, Old); 2081 } 2082 // C++ [basic.link]p10: 2083 // [...] the types specified by all declarations referring to a given 2084 // object or function shall be identical, except that declarations for an 2085 // array object can specify array types that differ by the presence or 2086 // absence of a major array bound (8.3.4). 2087 else if (Old->getType()->isIncompleteArrayType() && 2088 New->getType()->isArrayType()) { 2089 CanQual<ArrayType> OldArray 2090 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 2091 CanQual<ArrayType> NewArray 2092 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 2093 if (OldArray->getElementType() == NewArray->getElementType()) 2094 MergedT = New->getType(); 2095 } else if (Old->getType()->isArrayType() && 2096 New->getType()->isIncompleteArrayType()) { 2097 CanQual<ArrayType> OldArray 2098 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 2099 CanQual<ArrayType> NewArray 2100 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 2101 if (OldArray->getElementType() == NewArray->getElementType()) 2102 MergedT = Old->getType(); 2103 } else if (New->getType()->isObjCObjectPointerType() 2104 && Old->getType()->isObjCObjectPointerType()) { 2105 MergedT = Context.mergeObjCGCQualifiers(New->getType(), 2106 Old->getType()); 2107 } 2108 } else { 2109 MergedT = Context.mergeTypes(New->getType(), Old->getType()); 2110 } 2111 if (MergedT.isNull()) { 2112 Diag(New->getLocation(), diag::err_redefinition_different_type) 2113 << New->getDeclName(); 2114 Diag(Old->getLocation(), diag::note_previous_definition); 2115 return New->setInvalidDecl(); 2116 } 2117 New->setType(MergedT); 2118} 2119 2120/// MergeVarDecl - We just parsed a variable 'New' which has the same name 2121/// and scope as a previous declaration 'Old'. Figure out how to resolve this 2122/// situation, merging decls or emitting diagnostics as appropriate. 2123/// 2124/// Tentative definition rules (C99 6.9.2p2) are checked by 2125/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 2126/// definitions here, since the initializer hasn't been attached. 2127/// 2128void Sema::MergeVarDecl(VarDecl *New, LookupResult &Previous) { 2129 // If the new decl is already invalid, don't do any other checking. 2130 if (New->isInvalidDecl()) 2131 return; 2132 2133 // Verify the old decl was also a variable. 2134 VarDecl *Old = 0; 2135 if (!Previous.isSingleResult() || 2136 !(Old = dyn_cast<VarDecl>(Previous.getFoundDecl()))) { 2137 Diag(New->getLocation(), diag::err_redefinition_different_kind) 2138 << New->getDeclName(); 2139 Diag(Previous.getRepresentativeDecl()->getLocation(), 2140 diag::note_previous_definition); 2141 return New->setInvalidDecl(); 2142 } 2143 2144 // C++ [class.mem]p1: 2145 // A member shall not be declared twice in the member-specification [...] 2146 // 2147 // Here, we need only consider static data members. 2148 if (Old->isStaticDataMember() && !New->isOutOfLine()) { 2149 Diag(New->getLocation(), diag::err_duplicate_member) 2150 << New->getIdentifier(); 2151 Diag(Old->getLocation(), diag::note_previous_declaration); 2152 New->setInvalidDecl(); 2153 } 2154 2155 mergeDeclAttributes(New, Old, Context); 2156 // Warn if an already-declared variable is made a weak_import in a subsequent declaration 2157 if (New->getAttr<WeakImportAttr>() && 2158 Old->getStorageClass() == SC_None && 2159 !Old->getAttr<WeakImportAttr>()) { 2160 Diag(New->getLocation(), diag::warn_weak_import) << New->getDeclName(); 2161 Diag(Old->getLocation(), diag::note_previous_definition); 2162 // Remove weak_import attribute on new declaration. 2163 New->dropAttr<WeakImportAttr>(); 2164 } 2165 2166 // Merge the types. 2167 MergeVarDeclTypes(New, Old); 2168 if (New->isInvalidDecl()) 2169 return; 2170 2171 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 2172 if (New->getStorageClass() == SC_Static && 2173 (Old->getStorageClass() == SC_None || Old->hasExternalStorage())) { 2174 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 2175 Diag(Old->getLocation(), diag::note_previous_definition); 2176 return New->setInvalidDecl(); 2177 } 2178 // C99 6.2.2p4: 2179 // For an identifier declared with the storage-class specifier 2180 // extern in a scope in which a prior declaration of that 2181 // identifier is visible,23) if the prior declaration specifies 2182 // internal or external linkage, the linkage of the identifier at 2183 // the later declaration is the same as the linkage specified at 2184 // the prior declaration. If no prior declaration is visible, or 2185 // if the prior declaration specifies no linkage, then the 2186 // identifier has external linkage. 2187 if (New->hasExternalStorage() && Old->hasLinkage()) 2188 /* Okay */; 2189 else if (New->getStorageClass() != SC_Static && 2190 Old->getStorageClass() == SC_Static) { 2191 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 2192 Diag(Old->getLocation(), diag::note_previous_definition); 2193 return New->setInvalidDecl(); 2194 } 2195 2196 // Check if extern is followed by non-extern and vice-versa. 2197 if (New->hasExternalStorage() && 2198 !Old->hasLinkage() && Old->isLocalVarDecl()) { 2199 Diag(New->getLocation(), diag::err_extern_non_extern) << New->getDeclName(); 2200 Diag(Old->getLocation(), diag::note_previous_definition); 2201 return New->setInvalidDecl(); 2202 } 2203 if (Old->hasExternalStorage() && 2204 !New->hasLinkage() && New->isLocalVarDecl()) { 2205 Diag(New->getLocation(), diag::err_non_extern_extern) << New->getDeclName(); 2206 Diag(Old->getLocation(), diag::note_previous_definition); 2207 return New->setInvalidDecl(); 2208 } 2209 2210 // __module_private__ is propagated to later declarations. 2211 if (Old->isModulePrivate()) 2212 New->setModulePrivate(); 2213 else if (New->isModulePrivate()) 2214 diagnoseModulePrivateRedeclaration(New, Old); 2215 2216 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 2217 2218 // FIXME: The test for external storage here seems wrong? We still 2219 // need to check for mismatches. 2220 if (!New->hasExternalStorage() && !New->isFileVarDecl() && 2221 // Don't complain about out-of-line definitions of static members. 2222 !(Old->getLexicalDeclContext()->isRecord() && 2223 !New->getLexicalDeclContext()->isRecord())) { 2224 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 2225 Diag(Old->getLocation(), diag::note_previous_definition); 2226 return New->setInvalidDecl(); 2227 } 2228 2229 if (New->isThreadSpecified() && !Old->isThreadSpecified()) { 2230 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName(); 2231 Diag(Old->getLocation(), diag::note_previous_definition); 2232 } else if (!New->isThreadSpecified() && Old->isThreadSpecified()) { 2233 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName(); 2234 Diag(Old->getLocation(), diag::note_previous_definition); 2235 } 2236 2237 // C++ doesn't have tentative definitions, so go right ahead and check here. 2238 const VarDecl *Def; 2239 if (getLangOptions().CPlusPlus && 2240 New->isThisDeclarationADefinition() == VarDecl::Definition && 2241 (Def = Old->getDefinition())) { 2242 Diag(New->getLocation(), diag::err_redefinition) 2243 << New->getDeclName(); 2244 Diag(Def->getLocation(), diag::note_previous_definition); 2245 New->setInvalidDecl(); 2246 return; 2247 } 2248 // c99 6.2.2 P4. 2249 // For an identifier declared with the storage-class specifier extern in a 2250 // scope in which a prior declaration of that identifier is visible, if 2251 // the prior declaration specifies internal or external linkage, the linkage 2252 // of the identifier at the later declaration is the same as the linkage 2253 // specified at the prior declaration. 2254 // FIXME. revisit this code. 2255 if (New->hasExternalStorage() && 2256 Old->getLinkage() == InternalLinkage && 2257 New->getDeclContext() == Old->getDeclContext()) 2258 New->setStorageClass(Old->getStorageClass()); 2259 2260 // Keep a chain of previous declarations. 2261 New->setPreviousDeclaration(Old); 2262 2263 // Inherit access appropriately. 2264 New->setAccess(Old->getAccess()); 2265} 2266 2267/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2268/// no declarator (e.g. "struct foo;") is parsed. 2269Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2270 DeclSpec &DS) { 2271 return ParsedFreeStandingDeclSpec(S, AS, DS, 2272 MultiTemplateParamsArg(*this, 0, 0)); 2273} 2274 2275/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2276/// no declarator (e.g. "struct foo;") is parsed. It also accopts template 2277/// parameters to cope with template friend declarations. 2278Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2279 DeclSpec &DS, 2280 MultiTemplateParamsArg TemplateParams) { 2281 Decl *TagD = 0; 2282 TagDecl *Tag = 0; 2283 if (DS.getTypeSpecType() == DeclSpec::TST_class || 2284 DS.getTypeSpecType() == DeclSpec::TST_struct || 2285 DS.getTypeSpecType() == DeclSpec::TST_union || 2286 DS.getTypeSpecType() == DeclSpec::TST_enum) { 2287 TagD = DS.getRepAsDecl(); 2288 2289 if (!TagD) // We probably had an error 2290 return 0; 2291 2292 // Note that the above type specs guarantee that the 2293 // type rep is a Decl, whereas in many of the others 2294 // it's a Type. 2295 Tag = dyn_cast<TagDecl>(TagD); 2296 } 2297 2298 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 2299 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 2300 // or incomplete types shall not be restrict-qualified." 2301 if (TypeQuals & DeclSpec::TQ_restrict) 2302 Diag(DS.getRestrictSpecLoc(), 2303 diag::err_typecheck_invalid_restrict_not_pointer_noarg) 2304 << DS.getSourceRange(); 2305 } 2306 2307 if (DS.isConstexprSpecified()) { 2308 // C++0x [dcl.constexpr]p1: constexpr can only be applied to declarations 2309 // and definitions of functions and variables. 2310 if (Tag) 2311 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_tag) 2312 << (DS.getTypeSpecType() == DeclSpec::TST_class ? 0 : 2313 DS.getTypeSpecType() == DeclSpec::TST_struct ? 1 : 2314 DS.getTypeSpecType() == DeclSpec::TST_union ? 2 : 3); 2315 else 2316 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_no_declarators); 2317 // Don't emit warnings after this error. 2318 return TagD; 2319 } 2320 2321 if (DS.isFriendSpecified()) { 2322 // If we're dealing with a decl but not a TagDecl, assume that 2323 // whatever routines created it handled the friendship aspect. 2324 if (TagD && !Tag) 2325 return 0; 2326 return ActOnFriendTypeDecl(S, DS, TemplateParams); 2327 } 2328 2329 // Track whether we warned about the fact that there aren't any 2330 // declarators. 2331 bool emittedWarning = false; 2332 2333 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 2334 ProcessDeclAttributeList(S, Record, DS.getAttributes().getList()); 2335 2336 if (!Record->getDeclName() && Record->isDefinition() && 2337 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { 2338 if (getLangOptions().CPlusPlus || 2339 Record->getDeclContext()->isRecord()) 2340 return BuildAnonymousStructOrUnion(S, DS, AS, Record); 2341 2342 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 2343 << DS.getSourceRange(); 2344 emittedWarning = true; 2345 } 2346 } 2347 2348 // Check for Microsoft C extension: anonymous struct. 2349 if (getLangOptions().MicrosoftExt && !getLangOptions().CPlusPlus && 2350 CurContext->isRecord() && 2351 DS.getStorageClassSpec() == DeclSpec::SCS_unspecified) { 2352 // Handle 2 kinds of anonymous struct: 2353 // struct STRUCT; 2354 // and 2355 // STRUCT_TYPE; <- where STRUCT_TYPE is a typedef struct. 2356 RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag); 2357 if ((Record && Record->getDeclName() && !Record->isDefinition()) || 2358 (DS.getTypeSpecType() == DeclSpec::TST_typename && 2359 DS.getRepAsType().get()->isStructureType())) { 2360 Diag(DS.getSourceRange().getBegin(), diag::ext_ms_anonymous_struct) 2361 << DS.getSourceRange(); 2362 return BuildMicrosoftCAnonymousStruct(S, DS, Record); 2363 } 2364 } 2365 2366 if (getLangOptions().CPlusPlus && 2367 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) 2368 if (EnumDecl *Enum = dyn_cast_or_null<EnumDecl>(Tag)) 2369 if (Enum->enumerator_begin() == Enum->enumerator_end() && 2370 !Enum->getIdentifier() && !Enum->isInvalidDecl()) { 2371 Diag(Enum->getLocation(), diag::ext_no_declarators) 2372 << DS.getSourceRange(); 2373 emittedWarning = true; 2374 } 2375 2376 // Skip all the checks below if we have a type error. 2377 if (DS.getTypeSpecType() == DeclSpec::TST_error) return TagD; 2378 2379 if (!DS.isMissingDeclaratorOk()) { 2380 // Warn about typedefs of enums without names, since this is an 2381 // extension in both Microsoft and GNU. 2382 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 2383 Tag && isa<EnumDecl>(Tag)) { 2384 Diag(DS.getSourceRange().getBegin(), diag::ext_typedef_without_a_name) 2385 << DS.getSourceRange(); 2386 return Tag; 2387 } 2388 2389 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 2390 << DS.getSourceRange(); 2391 emittedWarning = true; 2392 } 2393 2394 // We're going to complain about a bunch of spurious specifiers; 2395 // only do this if we're declaring a tag, because otherwise we 2396 // should be getting diag::ext_no_declarators. 2397 if (emittedWarning || (TagD && TagD->isInvalidDecl())) 2398 return TagD; 2399 2400 // Note that a linkage-specification sets a storage class, but 2401 // 'extern "C" struct foo;' is actually valid and not theoretically 2402 // useless. 2403 if (DeclSpec::SCS scs = DS.getStorageClassSpec()) 2404 if (!DS.isExternInLinkageSpec()) 2405 Diag(DS.getStorageClassSpecLoc(), diag::warn_standalone_specifier) 2406 << DeclSpec::getSpecifierName(scs); 2407 2408 if (DS.isThreadSpecified()) 2409 Diag(DS.getThreadSpecLoc(), diag::warn_standalone_specifier) << "__thread"; 2410 if (DS.getTypeQualifiers()) { 2411 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2412 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "const"; 2413 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2414 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "volatile"; 2415 // Restrict is covered above. 2416 } 2417 if (DS.isInlineSpecified()) 2418 Diag(DS.getInlineSpecLoc(), diag::warn_standalone_specifier) << "inline"; 2419 if (DS.isVirtualSpecified()) 2420 Diag(DS.getVirtualSpecLoc(), diag::warn_standalone_specifier) << "virtual"; 2421 if (DS.isExplicitSpecified()) 2422 Diag(DS.getExplicitSpecLoc(), diag::warn_standalone_specifier) <<"explicit"; 2423 2424 if (DS.isModulePrivateSpecified() && 2425 Tag && Tag->getDeclContext()->isFunctionOrMethod()) 2426 Diag(DS.getModulePrivateSpecLoc(), diag::err_module_private_local_class) 2427 << Tag->getTagKind() 2428 << FixItHint::CreateRemoval(DS.getModulePrivateSpecLoc()); 2429 2430 // FIXME: Warn on useless attributes 2431 2432 return TagD; 2433} 2434 2435/// ActOnVlaStmt - This rouine if finds a vla expression in a decl spec. 2436/// builds a statement for it and returns it so it is evaluated. 2437StmtResult Sema::ActOnVlaStmt(const DeclSpec &DS) { 2438 StmtResult R; 2439 if (DS.getTypeSpecType() == DeclSpec::TST_typeofExpr) { 2440 Expr *Exp = DS.getRepAsExpr(); 2441 QualType Ty = Exp->getType(); 2442 if (Ty->isPointerType()) { 2443 do 2444 Ty = Ty->getAs<PointerType>()->getPointeeType(); 2445 while (Ty->isPointerType()); 2446 } 2447 if (Ty->isVariableArrayType()) { 2448 R = ActOnExprStmt(MakeFullExpr(Exp)); 2449 } 2450 } 2451 return R; 2452} 2453 2454/// We are trying to inject an anonymous member into the given scope; 2455/// check if there's an existing declaration that can't be overloaded. 2456/// 2457/// \return true if this is a forbidden redeclaration 2458static bool CheckAnonMemberRedeclaration(Sema &SemaRef, 2459 Scope *S, 2460 DeclContext *Owner, 2461 DeclarationName Name, 2462 SourceLocation NameLoc, 2463 unsigned diagnostic) { 2464 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupMemberName, 2465 Sema::ForRedeclaration); 2466 if (!SemaRef.LookupName(R, S)) return false; 2467 2468 if (R.getAsSingle<TagDecl>()) 2469 return false; 2470 2471 // Pick a representative declaration. 2472 NamedDecl *PrevDecl = R.getRepresentativeDecl()->getUnderlyingDecl(); 2473 assert(PrevDecl && "Expected a non-null Decl"); 2474 2475 if (!SemaRef.isDeclInScope(PrevDecl, Owner, S)) 2476 return false; 2477 2478 SemaRef.Diag(NameLoc, diagnostic) << Name; 2479 SemaRef.Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 2480 2481 return true; 2482} 2483 2484/// InjectAnonymousStructOrUnionMembers - Inject the members of the 2485/// anonymous struct or union AnonRecord into the owning context Owner 2486/// and scope S. This routine will be invoked just after we realize 2487/// that an unnamed union or struct is actually an anonymous union or 2488/// struct, e.g., 2489/// 2490/// @code 2491/// union { 2492/// int i; 2493/// float f; 2494/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 2495/// // f into the surrounding scope.x 2496/// @endcode 2497/// 2498/// This routine is recursive, injecting the names of nested anonymous 2499/// structs/unions into the owning context and scope as well. 2500static bool InjectAnonymousStructOrUnionMembers(Sema &SemaRef, Scope *S, 2501 DeclContext *Owner, 2502 RecordDecl *AnonRecord, 2503 AccessSpecifier AS, 2504 SmallVector<NamedDecl*, 2> &Chaining, 2505 bool MSAnonStruct) { 2506 unsigned diagKind 2507 = AnonRecord->isUnion() ? diag::err_anonymous_union_member_redecl 2508 : diag::err_anonymous_struct_member_redecl; 2509 2510 bool Invalid = false; 2511 2512 // Look every FieldDecl and IndirectFieldDecl with a name. 2513 for (RecordDecl::decl_iterator D = AnonRecord->decls_begin(), 2514 DEnd = AnonRecord->decls_end(); 2515 D != DEnd; ++D) { 2516 if ((isa<FieldDecl>(*D) || isa<IndirectFieldDecl>(*D)) && 2517 cast<NamedDecl>(*D)->getDeclName()) { 2518 ValueDecl *VD = cast<ValueDecl>(*D); 2519 if (CheckAnonMemberRedeclaration(SemaRef, S, Owner, VD->getDeclName(), 2520 VD->getLocation(), diagKind)) { 2521 // C++ [class.union]p2: 2522 // The names of the members of an anonymous union shall be 2523 // distinct from the names of any other entity in the 2524 // scope in which the anonymous union is declared. 2525 Invalid = true; 2526 } else { 2527 // C++ [class.union]p2: 2528 // For the purpose of name lookup, after the anonymous union 2529 // definition, the members of the anonymous union are 2530 // considered to have been defined in the scope in which the 2531 // anonymous union is declared. 2532 unsigned OldChainingSize = Chaining.size(); 2533 if (IndirectFieldDecl *IF = dyn_cast<IndirectFieldDecl>(VD)) 2534 for (IndirectFieldDecl::chain_iterator PI = IF->chain_begin(), 2535 PE = IF->chain_end(); PI != PE; ++PI) 2536 Chaining.push_back(*PI); 2537 else 2538 Chaining.push_back(VD); 2539 2540 assert(Chaining.size() >= 2); 2541 NamedDecl **NamedChain = 2542 new (SemaRef.Context)NamedDecl*[Chaining.size()]; 2543 for (unsigned i = 0; i < Chaining.size(); i++) 2544 NamedChain[i] = Chaining[i]; 2545 2546 IndirectFieldDecl* IndirectField = 2547 IndirectFieldDecl::Create(SemaRef.Context, Owner, VD->getLocation(), 2548 VD->getIdentifier(), VD->getType(), 2549 NamedChain, Chaining.size()); 2550 2551 IndirectField->setAccess(AS); 2552 IndirectField->setImplicit(); 2553 SemaRef.PushOnScopeChains(IndirectField, S); 2554 2555 // That includes picking up the appropriate access specifier. 2556 if (AS != AS_none) IndirectField->setAccess(AS); 2557 2558 Chaining.resize(OldChainingSize); 2559 } 2560 } 2561 } 2562 2563 return Invalid; 2564} 2565 2566/// StorageClassSpecToVarDeclStorageClass - Maps a DeclSpec::SCS to 2567/// a VarDecl::StorageClass. Any error reporting is up to the caller: 2568/// illegal input values are mapped to SC_None. 2569static StorageClass 2570StorageClassSpecToVarDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2571 switch (StorageClassSpec) { 2572 case DeclSpec::SCS_unspecified: return SC_None; 2573 case DeclSpec::SCS_extern: return SC_Extern; 2574 case DeclSpec::SCS_static: return SC_Static; 2575 case DeclSpec::SCS_auto: return SC_Auto; 2576 case DeclSpec::SCS_register: return SC_Register; 2577 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2578 // Illegal SCSs map to None: error reporting is up to the caller. 2579 case DeclSpec::SCS_mutable: // Fall through. 2580 case DeclSpec::SCS_typedef: return SC_None; 2581 } 2582 llvm_unreachable("unknown storage class specifier"); 2583} 2584 2585/// StorageClassSpecToFunctionDeclStorageClass - Maps a DeclSpec::SCS to 2586/// a StorageClass. Any error reporting is up to the caller: 2587/// illegal input values are mapped to SC_None. 2588static StorageClass 2589StorageClassSpecToFunctionDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2590 switch (StorageClassSpec) { 2591 case DeclSpec::SCS_unspecified: return SC_None; 2592 case DeclSpec::SCS_extern: return SC_Extern; 2593 case DeclSpec::SCS_static: return SC_Static; 2594 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2595 // Illegal SCSs map to None: error reporting is up to the caller. 2596 case DeclSpec::SCS_auto: // Fall through. 2597 case DeclSpec::SCS_mutable: // Fall through. 2598 case DeclSpec::SCS_register: // Fall through. 2599 case DeclSpec::SCS_typedef: return SC_None; 2600 } 2601 llvm_unreachable("unknown storage class specifier"); 2602} 2603 2604/// BuildAnonymousStructOrUnion - Handle the declaration of an 2605/// anonymous structure or union. Anonymous unions are a C++ feature 2606/// (C++ [class.union]) and a GNU C extension; anonymous structures 2607/// are a GNU C and GNU C++ extension. 2608Decl *Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 2609 AccessSpecifier AS, 2610 RecordDecl *Record) { 2611 DeclContext *Owner = Record->getDeclContext(); 2612 2613 // Diagnose whether this anonymous struct/union is an extension. 2614 if (Record->isUnion() && !getLangOptions().CPlusPlus) 2615 Diag(Record->getLocation(), diag::ext_anonymous_union); 2616 else if (!Record->isUnion()) 2617 Diag(Record->getLocation(), diag::ext_anonymous_struct); 2618 2619 // C and C++ require different kinds of checks for anonymous 2620 // structs/unions. 2621 bool Invalid = false; 2622 if (getLangOptions().CPlusPlus) { 2623 const char* PrevSpec = 0; 2624 unsigned DiagID; 2625 // C++ [class.union]p3: 2626 // Anonymous unions declared in a named namespace or in the 2627 // global namespace shall be declared static. 2628 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 2629 (isa<TranslationUnitDecl>(Owner) || 2630 (isa<NamespaceDecl>(Owner) && 2631 cast<NamespaceDecl>(Owner)->getDeclName()))) { 2632 Diag(Record->getLocation(), diag::err_anonymous_union_not_static); 2633 Invalid = true; 2634 2635 // Recover by adding 'static'. 2636 DS.SetStorageClassSpec(DeclSpec::SCS_static, SourceLocation(), 2637 PrevSpec, DiagID, getLangOptions()); 2638 } 2639 // C++ [class.union]p3: 2640 // A storage class is not allowed in a declaration of an 2641 // anonymous union in a class scope. 2642 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 2643 isa<RecordDecl>(Owner)) { 2644 Diag(DS.getStorageClassSpecLoc(), 2645 diag::err_anonymous_union_with_storage_spec); 2646 Invalid = true; 2647 2648 // Recover by removing the storage specifier. 2649 DS.SetStorageClassSpec(DeclSpec::SCS_unspecified, SourceLocation(), 2650 PrevSpec, DiagID, getLangOptions()); 2651 } 2652 2653 // Ignore const/volatile/restrict qualifiers. 2654 if (DS.getTypeQualifiers()) { 2655 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2656 Diag(DS.getConstSpecLoc(), diag::ext_anonymous_struct_union_qualified) 2657 << Record->isUnion() << 0 2658 << FixItHint::CreateRemoval(DS.getConstSpecLoc()); 2659 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2660 Diag(DS.getVolatileSpecLoc(), diag::ext_anonymous_struct_union_qualified) 2661 << Record->isUnion() << 1 2662 << FixItHint::CreateRemoval(DS.getVolatileSpecLoc()); 2663 if (DS.getTypeQualifiers() & DeclSpec::TQ_restrict) 2664 Diag(DS.getRestrictSpecLoc(), diag::ext_anonymous_struct_union_qualified) 2665 << Record->isUnion() << 2 2666 << FixItHint::CreateRemoval(DS.getRestrictSpecLoc()); 2667 2668 DS.ClearTypeQualifiers(); 2669 } 2670 2671 // C++ [class.union]p2: 2672 // The member-specification of an anonymous union shall only 2673 // define non-static data members. [Note: nested types and 2674 // functions cannot be declared within an anonymous union. ] 2675 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 2676 MemEnd = Record->decls_end(); 2677 Mem != MemEnd; ++Mem) { 2678 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 2679 // C++ [class.union]p3: 2680 // An anonymous union shall not have private or protected 2681 // members (clause 11). 2682 assert(FD->getAccess() != AS_none); 2683 if (FD->getAccess() != AS_public) { 2684 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 2685 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 2686 Invalid = true; 2687 } 2688 2689 // C++ [class.union]p1 2690 // An object of a class with a non-trivial constructor, a non-trivial 2691 // copy constructor, a non-trivial destructor, or a non-trivial copy 2692 // assignment operator cannot be a member of a union, nor can an 2693 // array of such objects. 2694 if (!getLangOptions().CPlusPlus0x && CheckNontrivialField(FD)) 2695 Invalid = true; 2696 } else if ((*Mem)->isImplicit()) { 2697 // Any implicit members are fine. 2698 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 2699 // This is a type that showed up in an 2700 // elaborated-type-specifier inside the anonymous struct or 2701 // union, but which actually declares a type outside of the 2702 // anonymous struct or union. It's okay. 2703 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 2704 if (!MemRecord->isAnonymousStructOrUnion() && 2705 MemRecord->getDeclName()) { 2706 // Visual C++ allows type definition in anonymous struct or union. 2707 if (getLangOptions().MicrosoftExt) 2708 Diag(MemRecord->getLocation(), diag::ext_anonymous_record_with_type) 2709 << (int)Record->isUnion(); 2710 else { 2711 // This is a nested type declaration. 2712 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 2713 << (int)Record->isUnion(); 2714 Invalid = true; 2715 } 2716 } 2717 } else if (isa<AccessSpecDecl>(*Mem)) { 2718 // Any access specifier is fine. 2719 } else { 2720 // We have something that isn't a non-static data 2721 // member. Complain about it. 2722 unsigned DK = diag::err_anonymous_record_bad_member; 2723 if (isa<TypeDecl>(*Mem)) 2724 DK = diag::err_anonymous_record_with_type; 2725 else if (isa<FunctionDecl>(*Mem)) 2726 DK = diag::err_anonymous_record_with_function; 2727 else if (isa<VarDecl>(*Mem)) 2728 DK = diag::err_anonymous_record_with_static; 2729 2730 // Visual C++ allows type definition in anonymous struct or union. 2731 if (getLangOptions().MicrosoftExt && 2732 DK == diag::err_anonymous_record_with_type) 2733 Diag((*Mem)->getLocation(), diag::ext_anonymous_record_with_type) 2734 << (int)Record->isUnion(); 2735 else { 2736 Diag((*Mem)->getLocation(), DK) 2737 << (int)Record->isUnion(); 2738 Invalid = true; 2739 } 2740 } 2741 } 2742 } 2743 2744 if (!Record->isUnion() && !Owner->isRecord()) { 2745 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 2746 << (int)getLangOptions().CPlusPlus; 2747 Invalid = true; 2748 } 2749 2750 // Mock up a declarator. 2751 Declarator Dc(DS, Declarator::MemberContext); 2752 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2753 assert(TInfo && "couldn't build declarator info for anonymous struct/union"); 2754 2755 // Create a declaration for this anonymous struct/union. 2756 NamedDecl *Anon = 0; 2757 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 2758 Anon = FieldDecl::Create(Context, OwningClass, 2759 DS.getSourceRange().getBegin(), 2760 Record->getLocation(), 2761 /*IdentifierInfo=*/0, 2762 Context.getTypeDeclType(Record), 2763 TInfo, 2764 /*BitWidth=*/0, /*Mutable=*/false, 2765 /*HasInit=*/false); 2766 Anon->setAccess(AS); 2767 if (getLangOptions().CPlusPlus) 2768 FieldCollector->Add(cast<FieldDecl>(Anon)); 2769 } else { 2770 DeclSpec::SCS SCSpec = DS.getStorageClassSpec(); 2771 assert(SCSpec != DeclSpec::SCS_typedef && 2772 "Parser allowed 'typedef' as storage class VarDecl."); 2773 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 2774 if (SCSpec == DeclSpec::SCS_mutable) { 2775 // mutable can only appear on non-static class members, so it's always 2776 // an error here 2777 Diag(Record->getLocation(), diag::err_mutable_nonmember); 2778 Invalid = true; 2779 SC = SC_None; 2780 } 2781 SCSpec = DS.getStorageClassSpecAsWritten(); 2782 VarDecl::StorageClass SCAsWritten 2783 = StorageClassSpecToVarDeclStorageClass(SCSpec); 2784 2785 Anon = VarDecl::Create(Context, Owner, 2786 DS.getSourceRange().getBegin(), 2787 Record->getLocation(), /*IdentifierInfo=*/0, 2788 Context.getTypeDeclType(Record), 2789 TInfo, SC, SCAsWritten); 2790 2791 // Default-initialize the implicit variable. This initialization will be 2792 // trivial in almost all cases, except if a union member has an in-class 2793 // initializer: 2794 // union { int n = 0; }; 2795 ActOnUninitializedDecl(Anon, /*TypeMayContainAuto=*/false); 2796 } 2797 Anon->setImplicit(); 2798 2799 // Add the anonymous struct/union object to the current 2800 // context. We'll be referencing this object when we refer to one of 2801 // its members. 2802 Owner->addDecl(Anon); 2803 2804 // Inject the members of the anonymous struct/union into the owning 2805 // context and into the identifier resolver chain for name lookup 2806 // purposes. 2807 SmallVector<NamedDecl*, 2> Chain; 2808 Chain.push_back(Anon); 2809 2810 if (InjectAnonymousStructOrUnionMembers(*this, S, Owner, Record, AS, 2811 Chain, false)) 2812 Invalid = true; 2813 2814 // Mark this as an anonymous struct/union type. Note that we do not 2815 // do this until after we have already checked and injected the 2816 // members of this anonymous struct/union type, because otherwise 2817 // the members could be injected twice: once by DeclContext when it 2818 // builds its lookup table, and once by 2819 // InjectAnonymousStructOrUnionMembers. 2820 Record->setAnonymousStructOrUnion(true); 2821 2822 if (Invalid) 2823 Anon->setInvalidDecl(); 2824 2825 return Anon; 2826} 2827 2828/// BuildMicrosoftCAnonymousStruct - Handle the declaration of an 2829/// Microsoft C anonymous structure. 2830/// Ref: http://msdn.microsoft.com/en-us/library/z2cx9y4f.aspx 2831/// Example: 2832/// 2833/// struct A { int a; }; 2834/// struct B { struct A; int b; }; 2835/// 2836/// void foo() { 2837/// B var; 2838/// var.a = 3; 2839/// } 2840/// 2841Decl *Sema::BuildMicrosoftCAnonymousStruct(Scope *S, DeclSpec &DS, 2842 RecordDecl *Record) { 2843 2844 // If there is no Record, get the record via the typedef. 2845 if (!Record) 2846 Record = DS.getRepAsType().get()->getAsStructureType()->getDecl(); 2847 2848 // Mock up a declarator. 2849 Declarator Dc(DS, Declarator::TypeNameContext); 2850 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2851 assert(TInfo && "couldn't build declarator info for anonymous struct"); 2852 2853 // Create a declaration for this anonymous struct. 2854 NamedDecl* Anon = FieldDecl::Create(Context, 2855 cast<RecordDecl>(CurContext), 2856 DS.getSourceRange().getBegin(), 2857 DS.getSourceRange().getBegin(), 2858 /*IdentifierInfo=*/0, 2859 Context.getTypeDeclType(Record), 2860 TInfo, 2861 /*BitWidth=*/0, /*Mutable=*/false, 2862 /*HasInit=*/false); 2863 Anon->setImplicit(); 2864 2865 // Add the anonymous struct object to the current context. 2866 CurContext->addDecl(Anon); 2867 2868 // Inject the members of the anonymous struct into the current 2869 // context and into the identifier resolver chain for name lookup 2870 // purposes. 2871 SmallVector<NamedDecl*, 2> Chain; 2872 Chain.push_back(Anon); 2873 2874 if (InjectAnonymousStructOrUnionMembers(*this, S, CurContext, 2875 Record->getDefinition(), 2876 AS_none, Chain, true)) 2877 Anon->setInvalidDecl(); 2878 2879 return Anon; 2880} 2881 2882/// GetNameForDeclarator - Determine the full declaration name for the 2883/// given Declarator. 2884DeclarationNameInfo Sema::GetNameForDeclarator(Declarator &D) { 2885 return GetNameFromUnqualifiedId(D.getName()); 2886} 2887 2888/// \brief Retrieves the declaration name from a parsed unqualified-id. 2889DeclarationNameInfo 2890Sema::GetNameFromUnqualifiedId(const UnqualifiedId &Name) { 2891 DeclarationNameInfo NameInfo; 2892 NameInfo.setLoc(Name.StartLocation); 2893 2894 switch (Name.getKind()) { 2895 2896 case UnqualifiedId::IK_ImplicitSelfParam: 2897 case UnqualifiedId::IK_Identifier: 2898 NameInfo.setName(Name.Identifier); 2899 NameInfo.setLoc(Name.StartLocation); 2900 return NameInfo; 2901 2902 case UnqualifiedId::IK_OperatorFunctionId: 2903 NameInfo.setName(Context.DeclarationNames.getCXXOperatorName( 2904 Name.OperatorFunctionId.Operator)); 2905 NameInfo.setLoc(Name.StartLocation); 2906 NameInfo.getInfo().CXXOperatorName.BeginOpNameLoc 2907 = Name.OperatorFunctionId.SymbolLocations[0]; 2908 NameInfo.getInfo().CXXOperatorName.EndOpNameLoc 2909 = Name.EndLocation.getRawEncoding(); 2910 return NameInfo; 2911 2912 case UnqualifiedId::IK_LiteralOperatorId: 2913 NameInfo.setName(Context.DeclarationNames.getCXXLiteralOperatorName( 2914 Name.Identifier)); 2915 NameInfo.setLoc(Name.StartLocation); 2916 NameInfo.setCXXLiteralOperatorNameLoc(Name.EndLocation); 2917 return NameInfo; 2918 2919 case UnqualifiedId::IK_ConversionFunctionId: { 2920 TypeSourceInfo *TInfo; 2921 QualType Ty = GetTypeFromParser(Name.ConversionFunctionId, &TInfo); 2922 if (Ty.isNull()) 2923 return DeclarationNameInfo(); 2924 NameInfo.setName(Context.DeclarationNames.getCXXConversionFunctionName( 2925 Context.getCanonicalType(Ty))); 2926 NameInfo.setLoc(Name.StartLocation); 2927 NameInfo.setNamedTypeInfo(TInfo); 2928 return NameInfo; 2929 } 2930 2931 case UnqualifiedId::IK_ConstructorName: { 2932 TypeSourceInfo *TInfo; 2933 QualType Ty = GetTypeFromParser(Name.ConstructorName, &TInfo); 2934 if (Ty.isNull()) 2935 return DeclarationNameInfo(); 2936 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 2937 Context.getCanonicalType(Ty))); 2938 NameInfo.setLoc(Name.StartLocation); 2939 NameInfo.setNamedTypeInfo(TInfo); 2940 return NameInfo; 2941 } 2942 2943 case UnqualifiedId::IK_ConstructorTemplateId: { 2944 // In well-formed code, we can only have a constructor 2945 // template-id that refers to the current context, so go there 2946 // to find the actual type being constructed. 2947 CXXRecordDecl *CurClass = dyn_cast<CXXRecordDecl>(CurContext); 2948 if (!CurClass || CurClass->getIdentifier() != Name.TemplateId->Name) 2949 return DeclarationNameInfo(); 2950 2951 // Determine the type of the class being constructed. 2952 QualType CurClassType = Context.getTypeDeclType(CurClass); 2953 2954 // FIXME: Check two things: that the template-id names the same type as 2955 // CurClassType, and that the template-id does not occur when the name 2956 // was qualified. 2957 2958 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 2959 Context.getCanonicalType(CurClassType))); 2960 NameInfo.setLoc(Name.StartLocation); 2961 // FIXME: should we retrieve TypeSourceInfo? 2962 NameInfo.setNamedTypeInfo(0); 2963 return NameInfo; 2964 } 2965 2966 case UnqualifiedId::IK_DestructorName: { 2967 TypeSourceInfo *TInfo; 2968 QualType Ty = GetTypeFromParser(Name.DestructorName, &TInfo); 2969 if (Ty.isNull()) 2970 return DeclarationNameInfo(); 2971 NameInfo.setName(Context.DeclarationNames.getCXXDestructorName( 2972 Context.getCanonicalType(Ty))); 2973 NameInfo.setLoc(Name.StartLocation); 2974 NameInfo.setNamedTypeInfo(TInfo); 2975 return NameInfo; 2976 } 2977 2978 case UnqualifiedId::IK_TemplateId: { 2979 TemplateName TName = Name.TemplateId->Template.get(); 2980 SourceLocation TNameLoc = Name.TemplateId->TemplateNameLoc; 2981 return Context.getNameForTemplate(TName, TNameLoc); 2982 } 2983 2984 } // switch (Name.getKind()) 2985 2986 llvm_unreachable("Unknown name kind"); 2987} 2988 2989static QualType getCoreType(QualType Ty) { 2990 do { 2991 if (Ty->isPointerType() || Ty->isReferenceType()) 2992 Ty = Ty->getPointeeType(); 2993 else if (Ty->isArrayType()) 2994 Ty = Ty->castAsArrayTypeUnsafe()->getElementType(); 2995 else 2996 return Ty.withoutLocalFastQualifiers(); 2997 } while (true); 2998} 2999 3000/// isNearlyMatchingFunction - Determine whether the C++ functions 3001/// Declaration and Definition are "nearly" matching. This heuristic 3002/// is used to improve diagnostics in the case where an out-of-line 3003/// function definition doesn't match any declaration within the class 3004/// or namespace. Also sets Params to the list of indices to the 3005/// parameters that differ between the declaration and the definition. 3006static bool isNearlyMatchingFunction(ASTContext &Context, 3007 FunctionDecl *Declaration, 3008 FunctionDecl *Definition, 3009 llvm::SmallVectorImpl<unsigned> &Params) { 3010 Params.clear(); 3011 if (Declaration->param_size() != Definition->param_size()) 3012 return false; 3013 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 3014 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 3015 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 3016 3017 // The parameter types are identical 3018 if (Context.hasSameType(DefParamTy, DeclParamTy)) 3019 continue; 3020 3021 QualType DeclParamBaseTy = getCoreType(DeclParamTy); 3022 QualType DefParamBaseTy = getCoreType(DefParamTy); 3023 const IdentifierInfo *DeclTyName = DeclParamBaseTy.getBaseTypeIdentifier(); 3024 const IdentifierInfo *DefTyName = DefParamBaseTy.getBaseTypeIdentifier(); 3025 3026 if (Context.hasSameUnqualifiedType(DeclParamBaseTy, DefParamBaseTy) || 3027 (DeclTyName && DeclTyName == DefTyName)) 3028 Params.push_back(Idx); 3029 else // The two parameters aren't even close 3030 return false; 3031 } 3032 3033 return true; 3034} 3035 3036/// NeedsRebuildingInCurrentInstantiation - Checks whether the given 3037/// declarator needs to be rebuilt in the current instantiation. 3038/// Any bits of declarator which appear before the name are valid for 3039/// consideration here. That's specifically the type in the decl spec 3040/// and the base type in any member-pointer chunks. 3041static bool RebuildDeclaratorInCurrentInstantiation(Sema &S, Declarator &D, 3042 DeclarationName Name) { 3043 // The types we specifically need to rebuild are: 3044 // - typenames, typeofs, and decltypes 3045 // - types which will become injected class names 3046 // Of course, we also need to rebuild any type referencing such a 3047 // type. It's safest to just say "dependent", but we call out a 3048 // few cases here. 3049 3050 DeclSpec &DS = D.getMutableDeclSpec(); 3051 switch (DS.getTypeSpecType()) { 3052 case DeclSpec::TST_typename: 3053 case DeclSpec::TST_typeofType: 3054 case DeclSpec::TST_decltype: 3055 case DeclSpec::TST_underlyingType: { 3056 // Grab the type from the parser. 3057 TypeSourceInfo *TSI = 0; 3058 QualType T = S.GetTypeFromParser(DS.getRepAsType(), &TSI); 3059 if (T.isNull() || !T->isDependentType()) break; 3060 3061 // Make sure there's a type source info. This isn't really much 3062 // of a waste; most dependent types should have type source info 3063 // attached already. 3064 if (!TSI) 3065 TSI = S.Context.getTrivialTypeSourceInfo(T, DS.getTypeSpecTypeLoc()); 3066 3067 // Rebuild the type in the current instantiation. 3068 TSI = S.RebuildTypeInCurrentInstantiation(TSI, D.getIdentifierLoc(), Name); 3069 if (!TSI) return true; 3070 3071 // Store the new type back in the decl spec. 3072 ParsedType LocType = S.CreateParsedType(TSI->getType(), TSI); 3073 DS.UpdateTypeRep(LocType); 3074 break; 3075 } 3076 3077 case DeclSpec::TST_typeofExpr: { 3078 Expr *E = DS.getRepAsExpr(); 3079 ExprResult Result = S.RebuildExprInCurrentInstantiation(E); 3080 if (Result.isInvalid()) return true; 3081 DS.UpdateExprRep(Result.get()); 3082 break; 3083 } 3084 3085 default: 3086 // Nothing to do for these decl specs. 3087 break; 3088 } 3089 3090 // It doesn't matter what order we do this in. 3091 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) { 3092 DeclaratorChunk &Chunk = D.getTypeObject(I); 3093 3094 // The only type information in the declarator which can come 3095 // before the declaration name is the base type of a member 3096 // pointer. 3097 if (Chunk.Kind != DeclaratorChunk::MemberPointer) 3098 continue; 3099 3100 // Rebuild the scope specifier in-place. 3101 CXXScopeSpec &SS = Chunk.Mem.Scope(); 3102 if (S.RebuildNestedNameSpecifierInCurrentInstantiation(SS)) 3103 return true; 3104 } 3105 3106 return false; 3107} 3108 3109Decl *Sema::ActOnDeclarator(Scope *S, Declarator &D) { 3110 return HandleDeclarator(S, D, MultiTemplateParamsArg(*this), 3111 /*IsFunctionDefinition=*/false); 3112} 3113 3114/// DiagnoseClassNameShadow - Implement C++ [class.mem]p13: 3115/// If T is the name of a class, then each of the following shall have a 3116/// name different from T: 3117/// - every static data member of class T; 3118/// - every member function of class T 3119/// - every member of class T that is itself a type; 3120/// \returns true if the declaration name violates these rules. 3121bool Sema::DiagnoseClassNameShadow(DeclContext *DC, 3122 DeclarationNameInfo NameInfo) { 3123 DeclarationName Name = NameInfo.getName(); 3124 3125 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(DC)) 3126 if (Record->getIdentifier() && Record->getDeclName() == Name) { 3127 Diag(NameInfo.getLoc(), diag::err_member_name_of_class) << Name; 3128 return true; 3129 } 3130 3131 return false; 3132} 3133 3134Decl *Sema::HandleDeclarator(Scope *S, Declarator &D, 3135 MultiTemplateParamsArg TemplateParamLists, 3136 bool IsFunctionDefinition) { 3137 // TODO: consider using NameInfo for diagnostic. 3138 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 3139 DeclarationName Name = NameInfo.getName(); 3140 3141 // All of these full declarators require an identifier. If it doesn't have 3142 // one, the ParsedFreeStandingDeclSpec action should be used. 3143 if (!Name) { 3144 if (!D.isInvalidType()) // Reject this if we think it is valid. 3145 Diag(D.getDeclSpec().getSourceRange().getBegin(), 3146 diag::err_declarator_need_ident) 3147 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 3148 return 0; 3149 } else if (DiagnoseUnexpandedParameterPack(NameInfo, UPPC_DeclarationType)) 3150 return 0; 3151 3152 // The scope passed in may not be a decl scope. Zip up the scope tree until 3153 // we find one that is. 3154 while ((S->getFlags() & Scope::DeclScope) == 0 || 3155 (S->getFlags() & Scope::TemplateParamScope) != 0) 3156 S = S->getParent(); 3157 3158 DeclContext *DC = CurContext; 3159 if (D.getCXXScopeSpec().isInvalid()) 3160 D.setInvalidType(); 3161 else if (D.getCXXScopeSpec().isSet()) { 3162 if (DiagnoseUnexpandedParameterPack(D.getCXXScopeSpec(), 3163 UPPC_DeclarationQualifier)) 3164 return 0; 3165 3166 bool EnteringContext = !D.getDeclSpec().isFriendSpecified(); 3167 DC = computeDeclContext(D.getCXXScopeSpec(), EnteringContext); 3168 if (!DC) { 3169 // If we could not compute the declaration context, it's because the 3170 // declaration context is dependent but does not refer to a class, 3171 // class template, or class template partial specialization. Complain 3172 // and return early, to avoid the coming semantic disaster. 3173 Diag(D.getIdentifierLoc(), 3174 diag::err_template_qualified_declarator_no_match) 3175 << (NestedNameSpecifier*)D.getCXXScopeSpec().getScopeRep() 3176 << D.getCXXScopeSpec().getRange(); 3177 return 0; 3178 } 3179 bool IsDependentContext = DC->isDependentContext(); 3180 3181 if (!IsDependentContext && 3182 RequireCompleteDeclContext(D.getCXXScopeSpec(), DC)) 3183 return 0; 3184 3185 if (isa<CXXRecordDecl>(DC)) { 3186 if (!cast<CXXRecordDecl>(DC)->hasDefinition()) { 3187 Diag(D.getIdentifierLoc(), 3188 diag::err_member_def_undefined_record) 3189 << Name << DC << D.getCXXScopeSpec().getRange(); 3190 D.setInvalidType(); 3191 } else if (isa<CXXRecordDecl>(CurContext) && 3192 !D.getDeclSpec().isFriendSpecified()) { 3193 // The user provided a superfluous scope specifier inside a class 3194 // definition: 3195 // 3196 // class X { 3197 // void X::f(); 3198 // }; 3199 if (CurContext->Equals(DC)) 3200 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 3201 << Name << FixItHint::CreateRemoval(D.getCXXScopeSpec().getRange()); 3202 else 3203 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 3204 << Name << D.getCXXScopeSpec().getRange(); 3205 3206 // Pretend that this qualifier was not here. 3207 D.getCXXScopeSpec().clear(); 3208 } 3209 } 3210 3211 // Check whether we need to rebuild the type of the given 3212 // declaration in the current instantiation. 3213 if (EnteringContext && IsDependentContext && 3214 TemplateParamLists.size() != 0) { 3215 ContextRAII SavedContext(*this, DC); 3216 if (RebuildDeclaratorInCurrentInstantiation(*this, D, Name)) 3217 D.setInvalidType(); 3218 } 3219 } 3220 3221 if (DiagnoseClassNameShadow(DC, NameInfo)) 3222 // If this is a typedef, we'll end up spewing multiple diagnostics. 3223 // Just return early; it's safer. 3224 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3225 return 0; 3226 3227 NamedDecl *New; 3228 3229 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 3230 QualType R = TInfo->getType(); 3231 3232 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 3233 UPPC_DeclarationType)) 3234 D.setInvalidType(); 3235 3236 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 3237 ForRedeclaration); 3238 3239 // See if this is a redefinition of a variable in the same scope. 3240 if (!D.getCXXScopeSpec().isSet()) { 3241 bool IsLinkageLookup = false; 3242 3243 // If the declaration we're planning to build will be a function 3244 // or object with linkage, then look for another declaration with 3245 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 3246 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3247 /* Do nothing*/; 3248 else if (R->isFunctionType()) { 3249 if (CurContext->isFunctionOrMethod() || 3250 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3251 IsLinkageLookup = true; 3252 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 3253 IsLinkageLookup = true; 3254 else if (CurContext->getRedeclContext()->isTranslationUnit() && 3255 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3256 IsLinkageLookup = true; 3257 3258 if (IsLinkageLookup) 3259 Previous.clear(LookupRedeclarationWithLinkage); 3260 3261 LookupName(Previous, S, /* CreateBuiltins = */ IsLinkageLookup); 3262 } else { // Something like "int foo::x;" 3263 LookupQualifiedName(Previous, DC); 3264 3265 // Don't consider using declarations as previous declarations for 3266 // out-of-line members. 3267 RemoveUsingDecls(Previous); 3268 3269 // C++ 7.3.1.2p2: 3270 // Members (including explicit specializations of templates) of a named 3271 // namespace can also be defined outside that namespace by explicit 3272 // qualification of the name being defined, provided that the entity being 3273 // defined was already declared in the namespace and the definition appears 3274 // after the point of declaration in a namespace that encloses the 3275 // declarations namespace. 3276 // 3277 // Note that we only check the context at this point. We don't yet 3278 // have enough information to make sure that PrevDecl is actually 3279 // the declaration we want to match. For example, given: 3280 // 3281 // class X { 3282 // void f(); 3283 // void f(float); 3284 // }; 3285 // 3286 // void X::f(int) { } // ill-formed 3287 // 3288 // In this case, PrevDecl will point to the overload set 3289 // containing the two f's declared in X, but neither of them 3290 // matches. 3291 3292 // First check whether we named the global scope. 3293 if (isa<TranslationUnitDecl>(DC)) { 3294 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 3295 << Name << D.getCXXScopeSpec().getRange(); 3296 } else { 3297 DeclContext *Cur = CurContext; 3298 while (isa<LinkageSpecDecl>(Cur)) 3299 Cur = Cur->getParent(); 3300 if (!Cur->Encloses(DC)) { 3301 // The qualifying scope doesn't enclose the original declaration. 3302 // Emit diagnostic based on current scope. 3303 SourceLocation L = D.getIdentifierLoc(); 3304 SourceRange R = D.getCXXScopeSpec().getRange(); 3305 if (isa<FunctionDecl>(Cur)) 3306 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 3307 else 3308 Diag(L, diag::err_invalid_declarator_scope) 3309 << Name << cast<NamedDecl>(DC) << R; 3310 D.setInvalidType(); 3311 } 3312 } 3313 } 3314 3315 if (Previous.isSingleResult() && 3316 Previous.getFoundDecl()->isTemplateParameter()) { 3317 // Maybe we will complain about the shadowed template parameter. 3318 if (!D.isInvalidType()) 3319 if (DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), 3320 Previous.getFoundDecl())) 3321 D.setInvalidType(); 3322 3323 // Just pretend that we didn't see the previous declaration. 3324 Previous.clear(); 3325 } 3326 3327 // In C++, the previous declaration we find might be a tag type 3328 // (class or enum). In this case, the new declaration will hide the 3329 // tag type. Note that this does does not apply if we're declaring a 3330 // typedef (C++ [dcl.typedef]p4). 3331 if (Previous.isSingleTagDecl() && 3332 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 3333 Previous.clear(); 3334 3335 bool Redeclaration = false; 3336 bool AddToScope = true; 3337 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 3338 if (TemplateParamLists.size()) { 3339 Diag(D.getIdentifierLoc(), diag::err_template_typedef); 3340 return 0; 3341 } 3342 3343 New = ActOnTypedefDeclarator(S, D, DC, R, TInfo, Previous, Redeclaration); 3344 } else if (R->isFunctionType()) { 3345 New = ActOnFunctionDeclarator(S, D, DC, R, TInfo, Previous, 3346 move(TemplateParamLists), 3347 IsFunctionDefinition, Redeclaration, 3348 AddToScope); 3349 } else { 3350 New = ActOnVariableDeclarator(S, D, DC, R, TInfo, Previous, 3351 move(TemplateParamLists), 3352 Redeclaration); 3353 } 3354 3355 if (New == 0) 3356 return 0; 3357 3358 // If this has an identifier and is not an invalid redeclaration or 3359 // function template specialization, add it to the scope stack. 3360 if (New->getDeclName() && AddToScope && 3361 !(Redeclaration && New->isInvalidDecl())) 3362 PushOnScopeChains(New, S); 3363 3364 return New; 3365} 3366 3367/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 3368/// types into constant array types in certain situations which would otherwise 3369/// be errors (for GCC compatibility). 3370static QualType TryToFixInvalidVariablyModifiedType(QualType T, 3371 ASTContext &Context, 3372 bool &SizeIsNegative, 3373 llvm::APSInt &Oversized) { 3374 // This method tries to turn a variable array into a constant 3375 // array even when the size isn't an ICE. This is necessary 3376 // for compatibility with code that depends on gcc's buggy 3377 // constant expression folding, like struct {char x[(int)(char*)2];} 3378 SizeIsNegative = false; 3379 Oversized = 0; 3380 3381 if (T->isDependentType()) 3382 return QualType(); 3383 3384 QualifierCollector Qs; 3385 const Type *Ty = Qs.strip(T); 3386 3387 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) { 3388 QualType Pointee = PTy->getPointeeType(); 3389 QualType FixedType = 3390 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative, 3391 Oversized); 3392 if (FixedType.isNull()) return FixedType; 3393 FixedType = Context.getPointerType(FixedType); 3394 return Qs.apply(Context, FixedType); 3395 } 3396 if (const ParenType* PTy = dyn_cast<ParenType>(Ty)) { 3397 QualType Inner = PTy->getInnerType(); 3398 QualType FixedType = 3399 TryToFixInvalidVariablyModifiedType(Inner, Context, SizeIsNegative, 3400 Oversized); 3401 if (FixedType.isNull()) return FixedType; 3402 FixedType = Context.getParenType(FixedType); 3403 return Qs.apply(Context, FixedType); 3404 } 3405 3406 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 3407 if (!VLATy) 3408 return QualType(); 3409 // FIXME: We should probably handle this case 3410 if (VLATy->getElementType()->isVariablyModifiedType()) 3411 return QualType(); 3412 3413 Expr::EvalResult EvalResult; 3414 if (!VLATy->getSizeExpr() || 3415 !VLATy->getSizeExpr()->Evaluate(EvalResult, Context) || 3416 !EvalResult.Val.isInt()) 3417 return QualType(); 3418 3419 // Check whether the array size is negative. 3420 llvm::APSInt &Res = EvalResult.Val.getInt(); 3421 if (Res.isSigned() && Res.isNegative()) { 3422 SizeIsNegative = true; 3423 return QualType(); 3424 } 3425 3426 // Check whether the array is too large to be addressed. 3427 unsigned ActiveSizeBits 3428 = ConstantArrayType::getNumAddressingBits(Context, VLATy->getElementType(), 3429 Res); 3430 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) { 3431 Oversized = Res; 3432 return QualType(); 3433 } 3434 3435 return Context.getConstantArrayType(VLATy->getElementType(), 3436 Res, ArrayType::Normal, 0); 3437} 3438 3439/// \brief Register the given locally-scoped external C declaration so 3440/// that it can be found later for redeclarations 3441void 3442Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, 3443 const LookupResult &Previous, 3444 Scope *S) { 3445 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 3446 "Decl is not a locally-scoped decl!"); 3447 // Note that we have a locally-scoped external with this name. 3448 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 3449 3450 if (!Previous.isSingleResult()) 3451 return; 3452 3453 NamedDecl *PrevDecl = Previous.getFoundDecl(); 3454 3455 // If there was a previous declaration of this variable, it may be 3456 // in our identifier chain. Update the identifier chain with the new 3457 // declaration. 3458 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 3459 // The previous declaration was found on the identifer resolver 3460 // chain, so remove it from its scope. 3461 3462 if (S->isDeclScope(PrevDecl)) { 3463 // Special case for redeclarations in the SAME scope. 3464 // Because this declaration is going to be added to the identifier chain 3465 // later, we should temporarily take it OFF the chain. 3466 IdResolver.RemoveDecl(ND); 3467 3468 } else { 3469 // Find the scope for the original declaration. 3470 while (S && !S->isDeclScope(PrevDecl)) 3471 S = S->getParent(); 3472 } 3473 3474 if (S) 3475 S->RemoveDecl(PrevDecl); 3476 } 3477} 3478 3479llvm::DenseMap<DeclarationName, NamedDecl *>::iterator 3480Sema::findLocallyScopedExternalDecl(DeclarationName Name) { 3481 if (ExternalSource) { 3482 // Load locally-scoped external decls from the external source. 3483 SmallVector<NamedDecl *, 4> Decls; 3484 ExternalSource->ReadLocallyScopedExternalDecls(Decls); 3485 for (unsigned I = 0, N = Decls.size(); I != N; ++I) { 3486 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3487 = LocallyScopedExternalDecls.find(Decls[I]->getDeclName()); 3488 if (Pos == LocallyScopedExternalDecls.end()) 3489 LocallyScopedExternalDecls[Decls[I]->getDeclName()] = Decls[I]; 3490 } 3491 } 3492 3493 return LocallyScopedExternalDecls.find(Name); 3494} 3495 3496/// \brief Diagnose function specifiers on a declaration of an identifier that 3497/// does not identify a function. 3498void Sema::DiagnoseFunctionSpecifiers(Declarator& D) { 3499 // FIXME: We should probably indicate the identifier in question to avoid 3500 // confusion for constructs like "inline int a(), b;" 3501 if (D.getDeclSpec().isInlineSpecified()) 3502 Diag(D.getDeclSpec().getInlineSpecLoc(), 3503 diag::err_inline_non_function); 3504 3505 if (D.getDeclSpec().isVirtualSpecified()) 3506 Diag(D.getDeclSpec().getVirtualSpecLoc(), 3507 diag::err_virtual_non_function); 3508 3509 if (D.getDeclSpec().isExplicitSpecified()) 3510 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3511 diag::err_explicit_non_function); 3512} 3513 3514NamedDecl* 3515Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 3516 QualType R, TypeSourceInfo *TInfo, 3517 LookupResult &Previous, bool &Redeclaration) { 3518 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 3519 if (D.getCXXScopeSpec().isSet()) { 3520 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 3521 << D.getCXXScopeSpec().getRange(); 3522 D.setInvalidType(); 3523 // Pretend we didn't see the scope specifier. 3524 DC = CurContext; 3525 Previous.clear(); 3526 } 3527 3528 if (getLangOptions().CPlusPlus) { 3529 // Check that there are no default arguments (C++ only). 3530 CheckExtraCXXDefaultArguments(D); 3531 } 3532 3533 DiagnoseFunctionSpecifiers(D); 3534 3535 if (D.getDeclSpec().isThreadSpecified()) 3536 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 3537 if (D.getDeclSpec().isConstexprSpecified()) 3538 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 3539 << 1; 3540 3541 if (D.getName().Kind != UnqualifiedId::IK_Identifier) { 3542 Diag(D.getName().StartLocation, diag::err_typedef_not_identifier) 3543 << D.getName().getSourceRange(); 3544 return 0; 3545 } 3546 3547 TypedefDecl *NewTD = ParseTypedefDecl(S, D, R, TInfo); 3548 if (!NewTD) return 0; 3549 3550 // Handle attributes prior to checking for duplicates in MergeVarDecl 3551 ProcessDeclAttributes(S, NewTD, D); 3552 3553 CheckTypedefForVariablyModifiedType(S, NewTD); 3554 3555 return ActOnTypedefNameDecl(S, DC, NewTD, Previous, Redeclaration); 3556} 3557 3558void 3559Sema::CheckTypedefForVariablyModifiedType(Scope *S, TypedefNameDecl *NewTD) { 3560 // C99 6.7.7p2: If a typedef name specifies a variably modified type 3561 // then it shall have block scope. 3562 // Note that variably modified types must be fixed before merging the decl so 3563 // that redeclarations will match. 3564 QualType T = NewTD->getUnderlyingType(); 3565 if (T->isVariablyModifiedType()) { 3566 getCurFunction()->setHasBranchProtectedScope(); 3567 3568 if (S->getFnParent() == 0) { 3569 bool SizeIsNegative; 3570 llvm::APSInt Oversized; 3571 QualType FixedTy = 3572 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 3573 Oversized); 3574 if (!FixedTy.isNull()) { 3575 Diag(NewTD->getLocation(), diag::warn_illegal_constant_array_size); 3576 NewTD->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(FixedTy)); 3577 } else { 3578 if (SizeIsNegative) 3579 Diag(NewTD->getLocation(), diag::err_typecheck_negative_array_size); 3580 else if (T->isVariableArrayType()) 3581 Diag(NewTD->getLocation(), diag::err_vla_decl_in_file_scope); 3582 else if (Oversized.getBoolValue()) 3583 Diag(NewTD->getLocation(), diag::err_array_too_large) << Oversized.toString(10); 3584 else 3585 Diag(NewTD->getLocation(), diag::err_vm_decl_in_file_scope); 3586 NewTD->setInvalidDecl(); 3587 } 3588 } 3589 } 3590} 3591 3592 3593/// ActOnTypedefNameDecl - Perform semantic checking for a declaration which 3594/// declares a typedef-name, either using the 'typedef' type specifier or via 3595/// a C++0x [dcl.typedef]p2 alias-declaration: 'using T = A;'. 3596NamedDecl* 3597Sema::ActOnTypedefNameDecl(Scope *S, DeclContext *DC, TypedefNameDecl *NewTD, 3598 LookupResult &Previous, bool &Redeclaration) { 3599 // Merge the decl with the existing one if appropriate. If the decl is 3600 // in an outer scope, it isn't the same thing. 3601 FilterLookupForScope(Previous, DC, S, /*ConsiderLinkage*/ false, 3602 /*ExplicitInstantiationOrSpecialization=*/false); 3603 if (!Previous.empty()) { 3604 Redeclaration = true; 3605 MergeTypedefNameDecl(NewTD, Previous); 3606 } 3607 3608 // If this is the C FILE type, notify the AST context. 3609 if (IdentifierInfo *II = NewTD->getIdentifier()) 3610 if (!NewTD->isInvalidDecl() && 3611 NewTD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 3612 if (II->isStr("FILE")) 3613 Context.setFILEDecl(NewTD); 3614 else if (II->isStr("jmp_buf")) 3615 Context.setjmp_bufDecl(NewTD); 3616 else if (II->isStr("sigjmp_buf")) 3617 Context.setsigjmp_bufDecl(NewTD); 3618 else if (II->isStr("__builtin_va_list")) 3619 Context.setBuiltinVaListType(Context.getTypedefType(NewTD)); 3620 } 3621 3622 return NewTD; 3623} 3624 3625/// \brief Determines whether the given declaration is an out-of-scope 3626/// previous declaration. 3627/// 3628/// This routine should be invoked when name lookup has found a 3629/// previous declaration (PrevDecl) that is not in the scope where a 3630/// new declaration by the same name is being introduced. If the new 3631/// declaration occurs in a local scope, previous declarations with 3632/// linkage may still be considered previous declarations (C99 3633/// 6.2.2p4-5, C++ [basic.link]p6). 3634/// 3635/// \param PrevDecl the previous declaration found by name 3636/// lookup 3637/// 3638/// \param DC the context in which the new declaration is being 3639/// declared. 3640/// 3641/// \returns true if PrevDecl is an out-of-scope previous declaration 3642/// for a new delcaration with the same name. 3643static bool 3644isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 3645 ASTContext &Context) { 3646 if (!PrevDecl) 3647 return false; 3648 3649 if (!PrevDecl->hasLinkage()) 3650 return false; 3651 3652 if (Context.getLangOptions().CPlusPlus) { 3653 // C++ [basic.link]p6: 3654 // If there is a visible declaration of an entity with linkage 3655 // having the same name and type, ignoring entities declared 3656 // outside the innermost enclosing namespace scope, the block 3657 // scope declaration declares that same entity and receives the 3658 // linkage of the previous declaration. 3659 DeclContext *OuterContext = DC->getRedeclContext(); 3660 if (!OuterContext->isFunctionOrMethod()) 3661 // This rule only applies to block-scope declarations. 3662 return false; 3663 3664 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 3665 if (PrevOuterContext->isRecord()) 3666 // We found a member function: ignore it. 3667 return false; 3668 3669 // Find the innermost enclosing namespace for the new and 3670 // previous declarations. 3671 OuterContext = OuterContext->getEnclosingNamespaceContext(); 3672 PrevOuterContext = PrevOuterContext->getEnclosingNamespaceContext(); 3673 3674 // The previous declaration is in a different namespace, so it 3675 // isn't the same function. 3676 if (!OuterContext->Equals(PrevOuterContext)) 3677 return false; 3678 } 3679 3680 return true; 3681} 3682 3683static void SetNestedNameSpecifier(DeclaratorDecl *DD, Declarator &D) { 3684 CXXScopeSpec &SS = D.getCXXScopeSpec(); 3685 if (!SS.isSet()) return; 3686 DD->setQualifierInfo(SS.getWithLocInContext(DD->getASTContext())); 3687} 3688 3689bool Sema::inferObjCARCLifetime(ValueDecl *decl) { 3690 QualType type = decl->getType(); 3691 Qualifiers::ObjCLifetime lifetime = type.getObjCLifetime(); 3692 if (lifetime == Qualifiers::OCL_Autoreleasing) { 3693 // Various kinds of declaration aren't allowed to be __autoreleasing. 3694 unsigned kind = -1U; 3695 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 3696 if (var->hasAttr<BlocksAttr>()) 3697 kind = 0; // __block 3698 else if (!var->hasLocalStorage()) 3699 kind = 1; // global 3700 } else if (isa<ObjCIvarDecl>(decl)) { 3701 kind = 3; // ivar 3702 } else if (isa<FieldDecl>(decl)) { 3703 kind = 2; // field 3704 } 3705 3706 if (kind != -1U) { 3707 Diag(decl->getLocation(), diag::err_arc_autoreleasing_var) 3708 << kind; 3709 } 3710 } else if (lifetime == Qualifiers::OCL_None) { 3711 // Try to infer lifetime. 3712 if (!type->isObjCLifetimeType()) 3713 return false; 3714 3715 lifetime = type->getObjCARCImplicitLifetime(); 3716 type = Context.getLifetimeQualifiedType(type, lifetime); 3717 decl->setType(type); 3718 } 3719 3720 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 3721 // Thread-local variables cannot have lifetime. 3722 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone && 3723 var->isThreadSpecified()) { 3724 Diag(var->getLocation(), diag::err_arc_thread_ownership) 3725 << var->getType(); 3726 return true; 3727 } 3728 } 3729 3730 return false; 3731} 3732 3733NamedDecl* 3734Sema::ActOnVariableDeclarator(Scope *S, Declarator &D, DeclContext *DC, 3735 QualType R, TypeSourceInfo *TInfo, 3736 LookupResult &Previous, 3737 MultiTemplateParamsArg TemplateParamLists, 3738 bool &Redeclaration) { 3739 DeclarationName Name = GetNameForDeclarator(D).getName(); 3740 3741 // Check that there are no default arguments (C++ only). 3742 if (getLangOptions().CPlusPlus) 3743 CheckExtraCXXDefaultArguments(D); 3744 3745 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpec(); 3746 assert(SCSpec != DeclSpec::SCS_typedef && 3747 "Parser allowed 'typedef' as storage class VarDecl."); 3748 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 3749 if (SCSpec == DeclSpec::SCS_mutable) { 3750 // mutable can only appear on non-static class members, so it's always 3751 // an error here 3752 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 3753 D.setInvalidType(); 3754 SC = SC_None; 3755 } 3756 SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 3757 VarDecl::StorageClass SCAsWritten 3758 = StorageClassSpecToVarDeclStorageClass(SCSpec); 3759 3760 IdentifierInfo *II = Name.getAsIdentifierInfo(); 3761 if (!II) { 3762 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 3763 << Name.getAsString(); 3764 return 0; 3765 } 3766 3767 DiagnoseFunctionSpecifiers(D); 3768 3769 if (!DC->isRecord() && S->getFnParent() == 0) { 3770 // C99 6.9p2: The storage-class specifiers auto and register shall not 3771 // appear in the declaration specifiers in an external declaration. 3772 if (SC == SC_Auto || SC == SC_Register) { 3773 3774 // If this is a register variable with an asm label specified, then this 3775 // is a GNU extension. 3776 if (SC == SC_Register && D.getAsmLabel()) 3777 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register); 3778 else 3779 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 3780 D.setInvalidType(); 3781 } 3782 } 3783 3784 if (getLangOptions().OpenCL) { 3785 // Set up the special work-group-local storage class for variables in the 3786 // OpenCL __local address space. 3787 if (R.getAddressSpace() == LangAS::opencl_local) 3788 SC = SC_OpenCLWorkGroupLocal; 3789 } 3790 3791 bool isExplicitSpecialization = false; 3792 VarDecl *NewVD; 3793 if (!getLangOptions().CPlusPlus) { 3794 NewVD = VarDecl::Create(Context, DC, D.getSourceRange().getBegin(), 3795 D.getIdentifierLoc(), II, 3796 R, TInfo, SC, SCAsWritten); 3797 3798 if (D.isInvalidType()) 3799 NewVD->setInvalidDecl(); 3800 } else { 3801 if (DC->isRecord() && !CurContext->isRecord()) { 3802 // This is an out-of-line definition of a static data member. 3803 if (SC == SC_Static) { 3804 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 3805 diag::err_static_out_of_line) 3806 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3807 } else if (SC == SC_None) 3808 SC = SC_Static; 3809 } 3810 if (SC == SC_Static) { 3811 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) { 3812 if (RD->isLocalClass()) 3813 Diag(D.getIdentifierLoc(), 3814 diag::err_static_data_member_not_allowed_in_local_class) 3815 << Name << RD->getDeclName(); 3816 3817 // C++ [class.union]p1: If a union contains a static data member, 3818 // the program is ill-formed. 3819 // 3820 // We also disallow static data members in anonymous structs. 3821 if (CurContext->isRecord() && (RD->isUnion() || !RD->getDeclName())) 3822 Diag(D.getIdentifierLoc(), 3823 diag::err_static_data_member_not_allowed_in_union_or_anon_struct) 3824 << Name << RD->isUnion(); 3825 } 3826 } 3827 3828 // Match up the template parameter lists with the scope specifier, then 3829 // determine whether we have a template or a template specialization. 3830 isExplicitSpecialization = false; 3831 bool Invalid = false; 3832 if (TemplateParameterList *TemplateParams 3833 = MatchTemplateParametersToScopeSpecifier( 3834 D.getDeclSpec().getSourceRange().getBegin(), 3835 D.getIdentifierLoc(), 3836 D.getCXXScopeSpec(), 3837 TemplateParamLists.get(), 3838 TemplateParamLists.size(), 3839 /*never a friend*/ false, 3840 isExplicitSpecialization, 3841 Invalid)) { 3842 if (TemplateParams->size() > 0) { 3843 // There is no such thing as a variable template. 3844 Diag(D.getIdentifierLoc(), diag::err_template_variable) 3845 << II 3846 << SourceRange(TemplateParams->getTemplateLoc(), 3847 TemplateParams->getRAngleLoc()); 3848 return 0; 3849 } else { 3850 // There is an extraneous 'template<>' for this variable. Complain 3851 // about it, but allow the declaration of the variable. 3852 Diag(TemplateParams->getTemplateLoc(), 3853 diag::err_template_variable_noparams) 3854 << II 3855 << SourceRange(TemplateParams->getTemplateLoc(), 3856 TemplateParams->getRAngleLoc()); 3857 } 3858 } 3859 3860 NewVD = VarDecl::Create(Context, DC, D.getSourceRange().getBegin(), 3861 D.getIdentifierLoc(), II, 3862 R, TInfo, SC, SCAsWritten); 3863 3864 // If this decl has an auto type in need of deduction, make a note of the 3865 // Decl so we can diagnose uses of it in its own initializer. 3866 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto && 3867 R->getContainedAutoType()) 3868 ParsingInitForAutoVars.insert(NewVD); 3869 3870 if (D.isInvalidType() || Invalid) 3871 NewVD->setInvalidDecl(); 3872 3873 SetNestedNameSpecifier(NewVD, D); 3874 3875 if (TemplateParamLists.size() > 0 && D.getCXXScopeSpec().isSet()) { 3876 NewVD->setTemplateParameterListsInfo(Context, 3877 TemplateParamLists.size(), 3878 TemplateParamLists.release()); 3879 } 3880 3881 if (D.getDeclSpec().isConstexprSpecified()) { 3882 // FIXME: check this is a valid use of constexpr. 3883 NewVD->setConstexpr(true); 3884 } 3885 } 3886 3887 // Set the lexical context. If the declarator has a C++ scope specifier, the 3888 // lexical context will be different from the semantic context. 3889 NewVD->setLexicalDeclContext(CurContext); 3890 3891 if (D.getDeclSpec().isThreadSpecified()) { 3892 if (NewVD->hasLocalStorage()) 3893 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global); 3894 else if (!Context.getTargetInfo().isTLSSupported()) 3895 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported); 3896 else 3897 NewVD->setThreadSpecified(true); 3898 } 3899 3900 if (D.getDeclSpec().isModulePrivateSpecified()) { 3901 if (isExplicitSpecialization) 3902 Diag(NewVD->getLocation(), diag::err_module_private_specialization) 3903 << 2 3904 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 3905 else if (NewVD->hasLocalStorage()) 3906 Diag(NewVD->getLocation(), diag::err_module_private_local) 3907 << 0 << NewVD->getDeclName() 3908 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 3909 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 3910 else 3911 NewVD->setModulePrivate(); 3912 } 3913 3914 // Handle attributes prior to checking for duplicates in MergeVarDecl 3915 ProcessDeclAttributes(S, NewVD, D); 3916 3917 // In auto-retain/release, infer strong retension for variables of 3918 // retainable type. 3919 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewVD)) 3920 NewVD->setInvalidDecl(); 3921 3922 // Handle GNU asm-label extension (encoded as an attribute). 3923 if (Expr *E = (Expr*)D.getAsmLabel()) { 3924 // The parser guarantees this is a string. 3925 StringLiteral *SE = cast<StringLiteral>(E); 3926 StringRef Label = SE->getString(); 3927 if (S->getFnParent() != 0) { 3928 switch (SC) { 3929 case SC_None: 3930 case SC_Auto: 3931 Diag(E->getExprLoc(), diag::warn_asm_label_on_auto_decl) << Label; 3932 break; 3933 case SC_Register: 3934 if (!Context.getTargetInfo().isValidGCCRegisterName(Label)) 3935 Diag(E->getExprLoc(), diag::err_asm_unknown_register_name) << Label; 3936 break; 3937 case SC_Static: 3938 case SC_Extern: 3939 case SC_PrivateExtern: 3940 case SC_OpenCLWorkGroupLocal: 3941 break; 3942 } 3943 } 3944 3945 NewVD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), 3946 Context, Label)); 3947 } 3948 3949 // Diagnose shadowed variables before filtering for scope. 3950 if (!D.getCXXScopeSpec().isSet()) 3951 CheckShadow(S, NewVD, Previous); 3952 3953 // Don't consider existing declarations that are in a different 3954 // scope and are out-of-semantic-context declarations (if the new 3955 // declaration has linkage). 3956 FilterLookupForScope(Previous, DC, S, NewVD->hasLinkage(), 3957 isExplicitSpecialization); 3958 3959 if (!getLangOptions().CPlusPlus) 3960 CheckVariableDeclaration(NewVD, Previous, Redeclaration); 3961 else { 3962 // Merge the decl with the existing one if appropriate. 3963 if (!Previous.empty()) { 3964 if (Previous.isSingleResult() && 3965 isa<FieldDecl>(Previous.getFoundDecl()) && 3966 D.getCXXScopeSpec().isSet()) { 3967 // The user tried to define a non-static data member 3968 // out-of-line (C++ [dcl.meaning]p1). 3969 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 3970 << D.getCXXScopeSpec().getRange(); 3971 Previous.clear(); 3972 NewVD->setInvalidDecl(); 3973 } 3974 } else if (D.getCXXScopeSpec().isSet()) { 3975 // No previous declaration in the qualifying scope. 3976 Diag(D.getIdentifierLoc(), diag::err_no_member) 3977 << Name << computeDeclContext(D.getCXXScopeSpec(), true) 3978 << D.getCXXScopeSpec().getRange(); 3979 NewVD->setInvalidDecl(); 3980 } 3981 3982 CheckVariableDeclaration(NewVD, Previous, Redeclaration); 3983 3984 // This is an explicit specialization of a static data member. Check it. 3985 if (isExplicitSpecialization && !NewVD->isInvalidDecl() && 3986 CheckMemberSpecialization(NewVD, Previous)) 3987 NewVD->setInvalidDecl(); 3988 } 3989 3990 // attributes declared post-definition are currently ignored 3991 // FIXME: This should be handled in attribute merging, not 3992 // here. 3993 if (Previous.isSingleResult()) { 3994 VarDecl *Def = dyn_cast<VarDecl>(Previous.getFoundDecl()); 3995 if (Def && (Def = Def->getDefinition()) && 3996 Def != NewVD && D.hasAttributes()) { 3997 Diag(NewVD->getLocation(), diag::warn_attribute_precede_definition); 3998 Diag(Def->getLocation(), diag::note_previous_definition); 3999 } 4000 } 4001 4002 // If this is a locally-scoped extern C variable, update the map of 4003 // such variables. 4004 if (CurContext->isFunctionOrMethod() && NewVD->isExternC() && 4005 !NewVD->isInvalidDecl()) 4006 RegisterLocallyScopedExternCDecl(NewVD, Previous, S); 4007 4008 // If there's a #pragma GCC visibility in scope, and this isn't a class 4009 // member, set the visibility of this variable. 4010 if (NewVD->getLinkage() == ExternalLinkage && !DC->isRecord()) 4011 AddPushedVisibilityAttribute(NewVD); 4012 4013 MarkUnusedFileScopedDecl(NewVD); 4014 4015 return NewVD; 4016} 4017 4018/// \brief Diagnose variable or built-in function shadowing. Implements 4019/// -Wshadow. 4020/// 4021/// This method is called whenever a VarDecl is added to a "useful" 4022/// scope. 4023/// 4024/// \param S the scope in which the shadowing name is being declared 4025/// \param R the lookup of the name 4026/// 4027void Sema::CheckShadow(Scope *S, VarDecl *D, const LookupResult& R) { 4028 // Return if warning is ignored. 4029 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, R.getNameLoc()) == 4030 DiagnosticsEngine::Ignored) 4031 return; 4032 4033 // Don't diagnose declarations at file scope. 4034 if (D->hasGlobalStorage()) 4035 return; 4036 4037 DeclContext *NewDC = D->getDeclContext(); 4038 4039 // Only diagnose if we're shadowing an unambiguous field or variable. 4040 if (R.getResultKind() != LookupResult::Found) 4041 return; 4042 4043 NamedDecl* ShadowedDecl = R.getFoundDecl(); 4044 if (!isa<VarDecl>(ShadowedDecl) && !isa<FieldDecl>(ShadowedDecl)) 4045 return; 4046 4047 // Fields are not shadowed by variables in C++ static methods. 4048 if (isa<FieldDecl>(ShadowedDecl)) 4049 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewDC)) 4050 if (MD->isStatic()) 4051 return; 4052 4053 if (VarDecl *shadowedVar = dyn_cast<VarDecl>(ShadowedDecl)) 4054 if (shadowedVar->isExternC()) { 4055 // For shadowing external vars, make sure that we point to the global 4056 // declaration, not a locally scoped extern declaration. 4057 for (VarDecl::redecl_iterator 4058 I = shadowedVar->redecls_begin(), E = shadowedVar->redecls_end(); 4059 I != E; ++I) 4060 if (I->isFileVarDecl()) { 4061 ShadowedDecl = *I; 4062 break; 4063 } 4064 } 4065 4066 DeclContext *OldDC = ShadowedDecl->getDeclContext(); 4067 4068 // Only warn about certain kinds of shadowing for class members. 4069 if (NewDC && NewDC->isRecord()) { 4070 // In particular, don't warn about shadowing non-class members. 4071 if (!OldDC->isRecord()) 4072 return; 4073 4074 // TODO: should we warn about static data members shadowing 4075 // static data members from base classes? 4076 4077 // TODO: don't diagnose for inaccessible shadowed members. 4078 // This is hard to do perfectly because we might friend the 4079 // shadowing context, but that's just a false negative. 4080 } 4081 4082 // Determine what kind of declaration we're shadowing. 4083 unsigned Kind; 4084 if (isa<RecordDecl>(OldDC)) { 4085 if (isa<FieldDecl>(ShadowedDecl)) 4086 Kind = 3; // field 4087 else 4088 Kind = 2; // static data member 4089 } else if (OldDC->isFileContext()) 4090 Kind = 1; // global 4091 else 4092 Kind = 0; // local 4093 4094 DeclarationName Name = R.getLookupName(); 4095 4096 // Emit warning and note. 4097 Diag(R.getNameLoc(), diag::warn_decl_shadow) << Name << Kind << OldDC; 4098 Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration); 4099} 4100 4101/// \brief Check -Wshadow without the advantage of a previous lookup. 4102void Sema::CheckShadow(Scope *S, VarDecl *D) { 4103 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, D->getLocation()) == 4104 DiagnosticsEngine::Ignored) 4105 return; 4106 4107 LookupResult R(*this, D->getDeclName(), D->getLocation(), 4108 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4109 LookupName(R, S); 4110 CheckShadow(S, D, R); 4111} 4112 4113/// \brief Perform semantic checking on a newly-created variable 4114/// declaration. 4115/// 4116/// This routine performs all of the type-checking required for a 4117/// variable declaration once it has been built. It is used both to 4118/// check variables after they have been parsed and their declarators 4119/// have been translated into a declaration, and to check variables 4120/// that have been instantiated from a template. 4121/// 4122/// Sets NewVD->isInvalidDecl() if an error was encountered. 4123void Sema::CheckVariableDeclaration(VarDecl *NewVD, 4124 LookupResult &Previous, 4125 bool &Redeclaration) { 4126 // If the decl is already known invalid, don't check it. 4127 if (NewVD->isInvalidDecl()) 4128 return; 4129 4130 QualType T = NewVD->getType(); 4131 4132 if (T->isObjCObjectType()) { 4133 Diag(NewVD->getLocation(), diag::err_statically_allocated_object) 4134 << FixItHint::CreateInsertion(NewVD->getLocation(), "*"); 4135 T = Context.getObjCObjectPointerType(T); 4136 NewVD->setType(T); 4137 } 4138 4139 // Emit an error if an address space was applied to decl with local storage. 4140 // This includes arrays of objects with address space qualifiers, but not 4141 // automatic variables that point to other address spaces. 4142 // ISO/IEC TR 18037 S5.1.2 4143 if (NewVD->hasLocalStorage() && T.getAddressSpace() != 0) { 4144 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 4145 return NewVD->setInvalidDecl(); 4146 } 4147 4148 if (NewVD->hasLocalStorage() && T.isObjCGCWeak() 4149 && !NewVD->hasAttr<BlocksAttr>()) { 4150 if (getLangOptions().getGC() != LangOptions::NonGC) 4151 Diag(NewVD->getLocation(), diag::warn_gc_attribute_weak_on_local); 4152 else 4153 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 4154 } 4155 4156 bool isVM = T->isVariablyModifiedType(); 4157 if (isVM || NewVD->hasAttr<CleanupAttr>() || 4158 NewVD->hasAttr<BlocksAttr>()) 4159 getCurFunction()->setHasBranchProtectedScope(); 4160 4161 if ((isVM && NewVD->hasLinkage()) || 4162 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { 4163 bool SizeIsNegative; 4164 llvm::APSInt Oversized; 4165 QualType FixedTy = 4166 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 4167 Oversized); 4168 4169 if (FixedTy.isNull() && T->isVariableArrayType()) { 4170 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 4171 // FIXME: This won't give the correct result for 4172 // int a[10][n]; 4173 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 4174 4175 if (NewVD->isFileVarDecl()) 4176 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 4177 << SizeRange; 4178 else if (NewVD->getStorageClass() == SC_Static) 4179 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 4180 << SizeRange; 4181 else 4182 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 4183 << SizeRange; 4184 return NewVD->setInvalidDecl(); 4185 } 4186 4187 if (FixedTy.isNull()) { 4188 if (NewVD->isFileVarDecl()) 4189 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 4190 else 4191 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 4192 return NewVD->setInvalidDecl(); 4193 } 4194 4195 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 4196 NewVD->setType(FixedTy); 4197 } 4198 4199 if (Previous.empty() && NewVD->isExternC()) { 4200 // Since we did not find anything by this name and we're declaring 4201 // an extern "C" variable, look for a non-visible extern "C" 4202 // declaration with the same name. 4203 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 4204 = findLocallyScopedExternalDecl(NewVD->getDeclName()); 4205 if (Pos != LocallyScopedExternalDecls.end()) 4206 Previous.addDecl(Pos->second); 4207 } 4208 4209 if (T->isVoidType() && !NewVD->hasExternalStorage()) { 4210 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 4211 << T; 4212 return NewVD->setInvalidDecl(); 4213 } 4214 4215 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { 4216 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); 4217 return NewVD->setInvalidDecl(); 4218 } 4219 4220 if (isVM && NewVD->hasAttr<BlocksAttr>()) { 4221 Diag(NewVD->getLocation(), diag::err_block_on_vm); 4222 return NewVD->setInvalidDecl(); 4223 } 4224 4225 // Function pointers and references cannot have qualified function type, only 4226 // function pointer-to-members can do that. 4227 QualType Pointee; 4228 unsigned PtrOrRef = 0; 4229 if (const PointerType *Ptr = T->getAs<PointerType>()) 4230 Pointee = Ptr->getPointeeType(); 4231 else if (const ReferenceType *Ref = T->getAs<ReferenceType>()) { 4232 Pointee = Ref->getPointeeType(); 4233 PtrOrRef = 1; 4234 } 4235 if (!Pointee.isNull() && Pointee->isFunctionProtoType() && 4236 Pointee->getAs<FunctionProtoType>()->getTypeQuals() != 0) { 4237 Diag(NewVD->getLocation(), diag::err_invalid_qualified_function_pointer) 4238 << PtrOrRef; 4239 return NewVD->setInvalidDecl(); 4240 } 4241 4242 if (!Previous.empty()) { 4243 Redeclaration = true; 4244 MergeVarDecl(NewVD, Previous); 4245 } 4246} 4247 4248/// \brief Data used with FindOverriddenMethod 4249struct FindOverriddenMethodData { 4250 Sema *S; 4251 CXXMethodDecl *Method; 4252}; 4253 4254/// \brief Member lookup function that determines whether a given C++ 4255/// method overrides a method in a base class, to be used with 4256/// CXXRecordDecl::lookupInBases(). 4257static bool FindOverriddenMethod(const CXXBaseSpecifier *Specifier, 4258 CXXBasePath &Path, 4259 void *UserData) { 4260 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4261 4262 FindOverriddenMethodData *Data 4263 = reinterpret_cast<FindOverriddenMethodData*>(UserData); 4264 4265 DeclarationName Name = Data->Method->getDeclName(); 4266 4267 // FIXME: Do we care about other names here too? 4268 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4269 // We really want to find the base class destructor here. 4270 QualType T = Data->S->Context.getTypeDeclType(BaseRecord); 4271 CanQualType CT = Data->S->Context.getCanonicalType(T); 4272 4273 Name = Data->S->Context.DeclarationNames.getCXXDestructorName(CT); 4274 } 4275 4276 for (Path.Decls = BaseRecord->lookup(Name); 4277 Path.Decls.first != Path.Decls.second; 4278 ++Path.Decls.first) { 4279 NamedDecl *D = *Path.Decls.first; 4280 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4281 if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD, false)) 4282 return true; 4283 } 4284 } 4285 4286 return false; 4287} 4288 4289/// AddOverriddenMethods - See if a method overrides any in the base classes, 4290/// and if so, check that it's a valid override and remember it. 4291bool Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4292 // Look for virtual methods in base classes that this method might override. 4293 CXXBasePaths Paths; 4294 FindOverriddenMethodData Data; 4295 Data.Method = MD; 4296 Data.S = this; 4297 bool AddedAny = false; 4298 if (DC->lookupInBases(&FindOverriddenMethod, &Data, Paths)) { 4299 for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(), 4300 E = Paths.found_decls_end(); I != E; ++I) { 4301 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) { 4302 MD->addOverriddenMethod(OldMD->getCanonicalDecl()); 4303 if (!CheckOverridingFunctionReturnType(MD, OldMD) && 4304 !CheckOverridingFunctionExceptionSpec(MD, OldMD) && 4305 !CheckIfOverriddenFunctionIsMarkedFinal(MD, OldMD)) { 4306 AddedAny = true; 4307 } 4308 } 4309 } 4310 } 4311 4312 return AddedAny; 4313} 4314 4315static void DiagnoseInvalidRedeclaration(Sema &S, FunctionDecl *NewFD, 4316 bool isFriendDecl) { 4317 DeclarationName Name = NewFD->getDeclName(); 4318 DeclContext *DC = NewFD->getDeclContext(); 4319 LookupResult Prev(S, Name, NewFD->getLocation(), 4320 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4321 llvm::SmallVector<unsigned, 1> MismatchedParams; 4322 llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1> NearMatches; 4323 TypoCorrection Correction; 4324 unsigned DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend 4325 : diag::err_member_def_does_not_match; 4326 4327 NewFD->setInvalidDecl(); 4328 S.LookupQualifiedName(Prev, DC); 4329 assert(!Prev.isAmbiguous() && 4330 "Cannot have an ambiguity in previous-declaration lookup"); 4331 if (!Prev.empty()) { 4332 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 4333 Func != FuncEnd; ++Func) { 4334 FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func); 4335 if (FD && isNearlyMatchingFunction(S.Context, FD, NewFD, 4336 MismatchedParams)) { 4337 // Add 1 to the index so that 0 can mean the mismatch didn't 4338 // involve a parameter 4339 unsigned ParamNum = 4340 MismatchedParams.empty() ? 0 : MismatchedParams.front() + 1; 4341 NearMatches.push_back(std::make_pair(FD, ParamNum)); 4342 } 4343 } 4344 // If the qualified name lookup yielded nothing, try typo correction 4345 } else if ((Correction = S.CorrectTypo(Prev.getLookupNameInfo(), 4346 Prev.getLookupKind(), 0, 0, DC)) && 4347 Correction.getCorrection() != Name) { 4348 for (TypoCorrection::decl_iterator CDecl = Correction.begin(), 4349 CDeclEnd = Correction.end(); 4350 CDecl != CDeclEnd; ++CDecl) { 4351 FunctionDecl *FD = dyn_cast<FunctionDecl>(*CDecl); 4352 if (FD && isNearlyMatchingFunction(S.Context, FD, NewFD, 4353 MismatchedParams)) { 4354 // Add 1 to the index so that 0 can mean the mismatch didn't 4355 // involve a parameter 4356 unsigned ParamNum = 4357 MismatchedParams.empty() ? 0 : MismatchedParams.front() + 1; 4358 NearMatches.push_back(std::make_pair(FD, ParamNum)); 4359 } 4360 } 4361 if (!NearMatches.empty()) 4362 DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend_suggest 4363 : diag::err_member_def_does_not_match_suggest; 4364 } 4365 4366 // Ignore the correction if it didn't yield any close FunctionDecl matches 4367 if (Correction && NearMatches.empty()) 4368 Correction = TypoCorrection(); 4369 4370 if (Correction) 4371 S.Diag(NewFD->getLocation(), DiagMsg) 4372 << Name << DC << Correction.getQuoted(S.getLangOptions()) 4373 << FixItHint::CreateReplacement( 4374 NewFD->getLocation(), Correction.getAsString(S.getLangOptions())); 4375 else 4376 S.Diag(NewFD->getLocation(), DiagMsg) << Name << DC << NewFD->getLocation(); 4377 4378 for (llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1>::iterator 4379 NearMatch = NearMatches.begin(), NearMatchEnd = NearMatches.end(); 4380 NearMatch != NearMatchEnd; ++NearMatch) { 4381 FunctionDecl *FD = NearMatch->first; 4382 4383 if (unsigned Idx = NearMatch->second) { 4384 ParmVarDecl *FDParam = FD->getParamDecl(Idx-1); 4385 S.Diag(FDParam->getTypeSpecStartLoc(), 4386 diag::note_member_def_close_param_match) 4387 << Idx << FDParam->getType() << NewFD->getParamDecl(Idx-1)->getType(); 4388 } else if (Correction) { 4389 S.Diag(FD->getLocation(), diag::note_previous_decl) 4390 << Correction.getQuoted(S.getLangOptions()); 4391 } else 4392 S.Diag(FD->getLocation(), diag::note_member_def_close_match); 4393 } 4394} 4395 4396NamedDecl* 4397Sema::ActOnFunctionDeclarator(Scope *S, Declarator &D, DeclContext *DC, 4398 QualType R, TypeSourceInfo *TInfo, 4399 LookupResult &Previous, 4400 MultiTemplateParamsArg TemplateParamLists, 4401 bool IsFunctionDefinition, bool &Redeclaration, 4402 bool &AddToScope) { 4403 assert(R.getTypePtr()->isFunctionType()); 4404 4405 // TODO: consider using NameInfo for diagnostic. 4406 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 4407 DeclarationName Name = NameInfo.getName(); 4408 FunctionDecl::StorageClass SC = SC_None; 4409 switch (D.getDeclSpec().getStorageClassSpec()) { 4410 default: llvm_unreachable("Unknown storage class!"); 4411 case DeclSpec::SCS_auto: 4412 case DeclSpec::SCS_register: 4413 case DeclSpec::SCS_mutable: 4414 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4415 diag::err_typecheck_sclass_func); 4416 D.setInvalidType(); 4417 break; 4418 case DeclSpec::SCS_unspecified: SC = SC_None; break; 4419 case DeclSpec::SCS_extern: SC = SC_Extern; break; 4420 case DeclSpec::SCS_static: { 4421 if (CurContext->getRedeclContext()->isFunctionOrMethod()) { 4422 // C99 6.7.1p5: 4423 // The declaration of an identifier for a function that has 4424 // block scope shall have no explicit storage-class specifier 4425 // other than extern 4426 // See also (C++ [dcl.stc]p4). 4427 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4428 diag::err_static_block_func); 4429 SC = SC_None; 4430 } else 4431 SC = SC_Static; 4432 break; 4433 } 4434 case DeclSpec::SCS_private_extern: SC = SC_PrivateExtern; break; 4435 } 4436 4437 if (D.getDeclSpec().isThreadSpecified()) 4438 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 4439 4440 // Do not allow returning a objc interface by-value. 4441 if (R->getAs<FunctionType>()->getResultType()->isObjCObjectType()) { 4442 Diag(D.getIdentifierLoc(), 4443 diag::err_object_cannot_be_passed_returned_by_value) << 0 4444 << R->getAs<FunctionType>()->getResultType() 4445 << FixItHint::CreateInsertion(D.getIdentifierLoc(), "*"); 4446 4447 QualType T = R->getAs<FunctionType>()->getResultType(); 4448 T = Context.getObjCObjectPointerType(T); 4449 if (const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(R)) { 4450 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 4451 R = Context.getFunctionType(T, FPT->arg_type_begin(), 4452 FPT->getNumArgs(), EPI); 4453 } 4454 else if (isa<FunctionNoProtoType>(R)) 4455 R = Context.getFunctionNoProtoType(T); 4456 } 4457 4458 FunctionDecl *NewFD; 4459 bool isInline = D.getDeclSpec().isInlineSpecified(); 4460 bool isFriend = false; 4461 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 4462 FunctionDecl::StorageClass SCAsWritten 4463 = StorageClassSpecToFunctionDeclStorageClass(SCSpec); 4464 FunctionTemplateDecl *FunctionTemplate = 0; 4465 bool isExplicitSpecialization = false; 4466 bool isFunctionTemplateSpecialization = false; 4467 bool isDependentClassScopeExplicitSpecialization = false; 4468 4469 if (!getLangOptions().CPlusPlus) { 4470 // Determine whether the function was written with a 4471 // prototype. This true when: 4472 // - there is a prototype in the declarator, or 4473 // - the type R of the function is some kind of typedef or other reference 4474 // to a type name (which eventually refers to a function type). 4475 bool HasPrototype = 4476 (D.isFunctionDeclarator() && D.getFunctionTypeInfo().hasPrototype) || 4477 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 4478 4479 NewFD = FunctionDecl::Create(Context, DC, D.getSourceRange().getBegin(), 4480 NameInfo, R, TInfo, SC, SCAsWritten, isInline, 4481 HasPrototype); 4482 if (D.isInvalidType()) 4483 NewFD->setInvalidDecl(); 4484 4485 // Set the lexical context. 4486 NewFD->setLexicalDeclContext(CurContext); 4487 // Filter out previous declarations that don't match the scope. 4488 FilterLookupForScope(Previous, DC, S, NewFD->hasLinkage(), 4489 /*ExplicitInstantiationOrSpecialization=*/false); 4490 } else { 4491 isFriend = D.getDeclSpec().isFriendSpecified(); 4492 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 4493 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 4494 bool isConstexpr = D.getDeclSpec().isConstexprSpecified(); 4495 bool isVirtualOkay = false; 4496 4497 // Check that the return type is not an abstract class type. 4498 // For record types, this is done by the AbstractClassUsageDiagnoser once 4499 // the class has been completely parsed. 4500 if (!DC->isRecord() && 4501 RequireNonAbstractType(D.getIdentifierLoc(), 4502 R->getAs<FunctionType>()->getResultType(), 4503 diag::err_abstract_type_in_decl, 4504 AbstractReturnType)) 4505 D.setInvalidType(); 4506 4507 if (Name.getNameKind() == DeclarationName::CXXConstructorName) { 4508 // This is a C++ constructor declaration. 4509 assert(DC->isRecord() && 4510 "Constructors can only be declared in a member context"); 4511 4512 R = CheckConstructorDeclarator(D, R, SC); 4513 4514 // Create the new declaration 4515 CXXConstructorDecl *NewCD = CXXConstructorDecl::Create( 4516 Context, 4517 cast<CXXRecordDecl>(DC), 4518 D.getSourceRange().getBegin(), 4519 NameInfo, R, TInfo, 4520 isExplicit, isInline, 4521 /*isImplicitlyDeclared=*/false, 4522 isConstexpr); 4523 4524 NewFD = NewCD; 4525 } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4526 // This is a C++ destructor declaration. 4527 if (DC->isRecord()) { 4528 R = CheckDestructorDeclarator(D, R, SC); 4529 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 4530 4531 CXXDestructorDecl *NewDD = CXXDestructorDecl::Create(Context, Record, 4532 D.getSourceRange().getBegin(), 4533 NameInfo, R, TInfo, 4534 isInline, 4535 /*isImplicitlyDeclared=*/false); 4536 NewFD = NewDD; 4537 isVirtualOkay = true; 4538 4539 // If the class is complete, then we now create the implicit exception 4540 // specification. If the class is incomplete or dependent, we can't do 4541 // it yet. 4542 if (getLangOptions().CPlusPlus0x && !Record->isDependentType() && 4543 Record->getDefinition() && !Record->isBeingDefined() && 4544 R->getAs<FunctionProtoType>()->getExceptionSpecType() == EST_None) { 4545 AdjustDestructorExceptionSpec(Record, NewDD); 4546 } 4547 4548 } else { 4549 Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 4550 4551 // Create a FunctionDecl to satisfy the function definition parsing 4552 // code path. 4553 NewFD = FunctionDecl::Create(Context, DC, D.getSourceRange().getBegin(), 4554 D.getIdentifierLoc(), Name, R, TInfo, 4555 SC, SCAsWritten, isInline, 4556 /*hasPrototype=*/true, isConstexpr); 4557 D.setInvalidType(); 4558 } 4559 } else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) { 4560 if (!DC->isRecord()) { 4561 Diag(D.getIdentifierLoc(), 4562 diag::err_conv_function_not_member); 4563 return 0; 4564 } 4565 4566 CheckConversionDeclarator(D, R, SC); 4567 NewFD = CXXConversionDecl::Create(Context, cast<CXXRecordDecl>(DC), 4568 D.getSourceRange().getBegin(), 4569 NameInfo, R, TInfo, 4570 isInline, isExplicit, isConstexpr, 4571 SourceLocation()); 4572 4573 isVirtualOkay = true; 4574 } else if (DC->isRecord()) { 4575 // If the name of the function is the same as the name of the record, 4576 // then this must be an invalid constructor that has a return type. 4577 // (The parser checks for a return type and makes the declarator a 4578 // constructor if it has no return type). 4579 if (Name.getAsIdentifierInfo() && 4580 Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ 4581 Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 4582 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 4583 << SourceRange(D.getIdentifierLoc()); 4584 return 0; 4585 } 4586 4587 bool isStatic = SC == SC_Static; 4588 4589 // [class.free]p1: 4590 // Any allocation function for a class T is a static member 4591 // (even if not explicitly declared static). 4592 if (Name.getCXXOverloadedOperator() == OO_New || 4593 Name.getCXXOverloadedOperator() == OO_Array_New) 4594 isStatic = true; 4595 4596 // [class.free]p6 Any deallocation function for a class X is a static member 4597 // (even if not explicitly declared static). 4598 if (Name.getCXXOverloadedOperator() == OO_Delete || 4599 Name.getCXXOverloadedOperator() == OO_Array_Delete) 4600 isStatic = true; 4601 4602 // This is a C++ method declaration. 4603 CXXMethodDecl *NewMD = CXXMethodDecl::Create( 4604 Context, cast<CXXRecordDecl>(DC), 4605 D.getSourceRange().getBegin(), 4606 NameInfo, R, TInfo, 4607 isStatic, SCAsWritten, isInline, 4608 isConstexpr, 4609 SourceLocation()); 4610 NewFD = NewMD; 4611 4612 isVirtualOkay = !isStatic; 4613 } else { 4614 // Determine whether the function was written with a 4615 // prototype. This true when: 4616 // - we're in C++ (where every function has a prototype), 4617 NewFD = FunctionDecl::Create(Context, DC, D.getSourceRange().getBegin(), 4618 NameInfo, R, TInfo, SC, SCAsWritten, isInline, 4619 true/*HasPrototype*/, isConstexpr); 4620 } 4621 4622 if (isFriend && !isInline && IsFunctionDefinition) { 4623 // C++ [class.friend]p5 4624 // A function can be defined in a friend declaration of a 4625 // class . . . . Such a function is implicitly inline. 4626 NewFD->setImplicitlyInline(); 4627 } 4628 4629 SetNestedNameSpecifier(NewFD, D); 4630 isExplicitSpecialization = false; 4631 isFunctionTemplateSpecialization = false; 4632 if (D.isInvalidType()) 4633 NewFD->setInvalidDecl(); 4634 4635 // Set the lexical context. If the declarator has a C++ 4636 // scope specifier, or is the object of a friend declaration, the 4637 // lexical context will be different from the semantic context. 4638 NewFD->setLexicalDeclContext(CurContext); 4639 4640 // Match up the template parameter lists with the scope specifier, then 4641 // determine whether we have a template or a template specialization. 4642 bool Invalid = false; 4643 if (TemplateParameterList *TemplateParams 4644 = MatchTemplateParametersToScopeSpecifier( 4645 D.getDeclSpec().getSourceRange().getBegin(), 4646 D.getIdentifierLoc(), 4647 D.getCXXScopeSpec(), 4648 TemplateParamLists.get(), 4649 TemplateParamLists.size(), 4650 isFriend, 4651 isExplicitSpecialization, 4652 Invalid)) { 4653 if (TemplateParams->size() > 0) { 4654 // This is a function template 4655 4656 // Check that we can declare a template here. 4657 if (CheckTemplateDeclScope(S, TemplateParams)) 4658 return 0; 4659 4660 // A destructor cannot be a template. 4661 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4662 Diag(NewFD->getLocation(), diag::err_destructor_template); 4663 return 0; 4664 } 4665 4666 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC, 4667 NewFD->getLocation(), 4668 Name, TemplateParams, 4669 NewFD); 4670 FunctionTemplate->setLexicalDeclContext(CurContext); 4671 NewFD->setDescribedFunctionTemplate(FunctionTemplate); 4672 4673 // For source fidelity, store the other template param lists. 4674 if (TemplateParamLists.size() > 1) { 4675 NewFD->setTemplateParameterListsInfo(Context, 4676 TemplateParamLists.size() - 1, 4677 TemplateParamLists.release()); 4678 } 4679 } else { 4680 // This is a function template specialization. 4681 isFunctionTemplateSpecialization = true; 4682 // For source fidelity, store all the template param lists. 4683 NewFD->setTemplateParameterListsInfo(Context, 4684 TemplateParamLists.size(), 4685 TemplateParamLists.release()); 4686 4687 // C++0x [temp.expl.spec]p20 forbids "template<> friend void foo(int);". 4688 if (isFriend) { 4689 // We want to remove the "template<>", found here. 4690 SourceRange RemoveRange = TemplateParams->getSourceRange(); 4691 4692 // If we remove the template<> and the name is not a 4693 // template-id, we're actually silently creating a problem: 4694 // the friend declaration will refer to an untemplated decl, 4695 // and clearly the user wants a template specialization. So 4696 // we need to insert '<>' after the name. 4697 SourceLocation InsertLoc; 4698 if (D.getName().getKind() != UnqualifiedId::IK_TemplateId) { 4699 InsertLoc = D.getName().getSourceRange().getEnd(); 4700 InsertLoc = PP.getLocForEndOfToken(InsertLoc); 4701 } 4702 4703 Diag(D.getIdentifierLoc(), diag::err_template_spec_decl_friend) 4704 << Name << RemoveRange 4705 << FixItHint::CreateRemoval(RemoveRange) 4706 << FixItHint::CreateInsertion(InsertLoc, "<>"); 4707 } 4708 } 4709 } 4710 else { 4711 // All template param lists were matched against the scope specifier: 4712 // this is NOT (an explicit specialization of) a template. 4713 if (TemplateParamLists.size() > 0) 4714 // For source fidelity, store all the template param lists. 4715 NewFD->setTemplateParameterListsInfo(Context, 4716 TemplateParamLists.size(), 4717 TemplateParamLists.release()); 4718 } 4719 4720 if (Invalid) { 4721 NewFD->setInvalidDecl(); 4722 if (FunctionTemplate) 4723 FunctionTemplate->setInvalidDecl(); 4724 } 4725 4726 // C++ [dcl.fct.spec]p5: 4727 // The virtual specifier shall only be used in declarations of 4728 // nonstatic class member functions that appear within a 4729 // member-specification of a class declaration; see 10.3. 4730 // 4731 if (isVirtual && !NewFD->isInvalidDecl()) { 4732 if (!isVirtualOkay) { 4733 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4734 diag::err_virtual_non_function); 4735 } else if (!CurContext->isRecord()) { 4736 // 'virtual' was specified outside of the class. 4737 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4738 diag::err_virtual_out_of_class) 4739 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 4740 } else if (NewFD->getDescribedFunctionTemplate()) { 4741 // C++ [temp.mem]p3: 4742 // A member function template shall not be virtual. 4743 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4744 diag::err_virtual_member_function_template) 4745 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 4746 } else { 4747 // Okay: Add virtual to the method. 4748 NewFD->setVirtualAsWritten(true); 4749 } 4750 } 4751 4752 // C++ [dcl.fct.spec]p3: 4753 // The inline specifier shall not appear on a block scope function declaration. 4754 if (isInline && !NewFD->isInvalidDecl()) { 4755 if (CurContext->isFunctionOrMethod()) { 4756 // 'inline' is not allowed on block scope function declaration. 4757 Diag(D.getDeclSpec().getInlineSpecLoc(), 4758 diag::err_inline_declaration_block_scope) << Name 4759 << FixItHint::CreateRemoval(D.getDeclSpec().getInlineSpecLoc()); 4760 } 4761 } 4762 4763 // C++ [dcl.fct.spec]p6: 4764 // The explicit specifier shall be used only in the declaration of a 4765 // constructor or conversion function within its class definition; see 12.3.1 4766 // and 12.3.2. 4767 if (isExplicit && !NewFD->isInvalidDecl()) { 4768 if (!CurContext->isRecord()) { 4769 // 'explicit' was specified outside of the class. 4770 Diag(D.getDeclSpec().getExplicitSpecLoc(), 4771 diag::err_explicit_out_of_class) 4772 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 4773 } else if (!isa<CXXConstructorDecl>(NewFD) && 4774 !isa<CXXConversionDecl>(NewFD)) { 4775 // 'explicit' was specified on a function that wasn't a constructor 4776 // or conversion function. 4777 Diag(D.getDeclSpec().getExplicitSpecLoc(), 4778 diag::err_explicit_non_ctor_or_conv_function) 4779 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 4780 } 4781 } 4782 4783 if (isConstexpr) { 4784 // C++0x [dcl.constexpr]p2: constexpr functions and constexpr constructors 4785 // are implicitly inline. 4786 NewFD->setImplicitlyInline(); 4787 4788 // FIXME: If this is a redeclaration, check the original declaration was 4789 // marked constepr. 4790 4791 // C++0x [dcl.constexpr]p3: functions declared constexpr are required to 4792 // be either constructors or to return a literal type. Therefore, 4793 // destructors cannot be declared constexpr. 4794 if (isa<CXXDestructorDecl>(NewFD)) 4795 Diag(D.getDeclSpec().getConstexprSpecLoc(), 4796 diag::err_constexpr_dtor); 4797 } 4798 4799 // If __module_private__ was specified, mark the function accordingly. 4800 if (D.getDeclSpec().isModulePrivateSpecified()) { 4801 if (isFunctionTemplateSpecialization) { 4802 SourceLocation ModulePrivateLoc 4803 = D.getDeclSpec().getModulePrivateSpecLoc(); 4804 Diag(ModulePrivateLoc, diag::err_module_private_specialization) 4805 << 0 4806 << FixItHint::CreateRemoval(ModulePrivateLoc); 4807 } else { 4808 NewFD->setModulePrivate(); 4809 if (FunctionTemplate) 4810 FunctionTemplate->setModulePrivate(); 4811 } 4812 } 4813 4814 // Filter out previous declarations that don't match the scope. 4815 FilterLookupForScope(Previous, DC, S, NewFD->hasLinkage(), 4816 isExplicitSpecialization || 4817 isFunctionTemplateSpecialization); 4818 4819 if (isFriend) { 4820 // For now, claim that the objects have no previous declaration. 4821 if (FunctionTemplate) { 4822 FunctionTemplate->setObjectOfFriendDecl(false); 4823 FunctionTemplate->setAccess(AS_public); 4824 } 4825 NewFD->setObjectOfFriendDecl(false); 4826 NewFD->setAccess(AS_public); 4827 } 4828 4829 if (isa<CXXMethodDecl>(NewFD) && DC == CurContext && IsFunctionDefinition) { 4830 // A method is implicitly inline if it's defined in its class 4831 // definition. 4832 NewFD->setImplicitlyInline(); 4833 } 4834 4835 if (SC == SC_Static && isa<CXXMethodDecl>(NewFD) && 4836 !CurContext->isRecord()) { 4837 // C++ [class.static]p1: 4838 // A data or function member of a class may be declared static 4839 // in a class definition, in which case it is a static member of 4840 // the class. 4841 4842 // Complain about the 'static' specifier if it's on an out-of-line 4843 // member function definition. 4844 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4845 diag::err_static_out_of_line) 4846 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 4847 } 4848 } 4849 4850 // Handle GNU asm-label extension (encoded as an attribute). 4851 if (Expr *E = (Expr*) D.getAsmLabel()) { 4852 // The parser guarantees this is a string. 4853 StringLiteral *SE = cast<StringLiteral>(E); 4854 NewFD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), Context, 4855 SE->getString())); 4856 } 4857 4858 // Copy the parameter declarations from the declarator D to the function 4859 // declaration NewFD, if they are available. First scavenge them into Params. 4860 SmallVector<ParmVarDecl*, 16> Params; 4861 if (D.isFunctionDeclarator()) { 4862 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 4863 4864 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 4865 // function that takes no arguments, not a function that takes a 4866 // single void argument. 4867 // We let through "const void" here because Sema::GetTypeForDeclarator 4868 // already checks for that case. 4869 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 4870 FTI.ArgInfo[0].Param && 4871 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()) { 4872 // Empty arg list, don't push any params. 4873 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[0].Param); 4874 4875 // In C++, the empty parameter-type-list must be spelled "void"; a 4876 // typedef of void is not permitted. 4877 if (getLangOptions().CPlusPlus && 4878 Param->getType().getUnqualifiedType() != Context.VoidTy) { 4879 bool IsTypeAlias = false; 4880 if (const TypedefType *TT = Param->getType()->getAs<TypedefType>()) 4881 IsTypeAlias = isa<TypeAliasDecl>(TT->getDecl()); 4882 else if (const TemplateSpecializationType *TST = 4883 Param->getType()->getAs<TemplateSpecializationType>()) 4884 IsTypeAlias = TST->isTypeAlias(); 4885 Diag(Param->getLocation(), diag::err_param_typedef_of_void) 4886 << IsTypeAlias; 4887 } 4888 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 4889 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 4890 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 4891 assert(Param->getDeclContext() != NewFD && "Was set before ?"); 4892 Param->setDeclContext(NewFD); 4893 Params.push_back(Param); 4894 4895 if (Param->isInvalidDecl()) 4896 NewFD->setInvalidDecl(); 4897 } 4898 } 4899 4900 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) { 4901 // When we're declaring a function with a typedef, typeof, etc as in the 4902 // following example, we'll need to synthesize (unnamed) 4903 // parameters for use in the declaration. 4904 // 4905 // @code 4906 // typedef void fn(int); 4907 // fn f; 4908 // @endcode 4909 4910 // Synthesize a parameter for each argument type. 4911 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 4912 AE = FT->arg_type_end(); AI != AE; ++AI) { 4913 ParmVarDecl *Param = 4914 BuildParmVarDeclForTypedef(NewFD, D.getIdentifierLoc(), *AI); 4915 Param->setScopeInfo(0, Params.size()); 4916 Params.push_back(Param); 4917 } 4918 } else { 4919 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && 4920 "Should not need args for typedef of non-prototype fn"); 4921 } 4922 // Finally, we know we have the right number of parameters, install them. 4923 NewFD->setParams(Params); 4924 4925 // Process the non-inheritable attributes on this declaration. 4926 ProcessDeclAttributes(S, NewFD, D, 4927 /*NonInheritable=*/true, /*Inheritable=*/false); 4928 4929 if (!getLangOptions().CPlusPlus) { 4930 // Perform semantic checking on the function declaration. 4931 bool isExplicitSpecialization=false; 4932 if (!NewFD->isInvalidDecl()) { 4933 if (NewFD->getResultType()->isVariablyModifiedType()) { 4934 // Functions returning a variably modified type violate C99 6.7.5.2p2 4935 // because all functions have linkage. 4936 Diag(NewFD->getLocation(), diag::err_vm_func_decl); 4937 NewFD->setInvalidDecl(); 4938 } else { 4939 if (NewFD->isMain()) 4940 CheckMain(NewFD, D.getDeclSpec()); 4941 CheckFunctionDeclaration(S, NewFD, Previous, isExplicitSpecialization, 4942 Redeclaration); 4943 } 4944 } 4945 assert((NewFD->isInvalidDecl() || !Redeclaration || 4946 Previous.getResultKind() != LookupResult::FoundOverloaded) && 4947 "previous declaration set still overloaded"); 4948 } else { 4949 // If the declarator is a template-id, translate the parser's template 4950 // argument list into our AST format. 4951 bool HasExplicitTemplateArgs = false; 4952 TemplateArgumentListInfo TemplateArgs; 4953 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) { 4954 TemplateIdAnnotation *TemplateId = D.getName().TemplateId; 4955 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc); 4956 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc); 4957 ASTTemplateArgsPtr TemplateArgsPtr(*this, 4958 TemplateId->getTemplateArgs(), 4959 TemplateId->NumArgs); 4960 translateTemplateArguments(TemplateArgsPtr, 4961 TemplateArgs); 4962 TemplateArgsPtr.release(); 4963 4964 HasExplicitTemplateArgs = true; 4965 4966 if (NewFD->isInvalidDecl()) { 4967 HasExplicitTemplateArgs = false; 4968 } else if (FunctionTemplate) { 4969 // Function template with explicit template arguments. 4970 Diag(D.getIdentifierLoc(), diag::err_function_template_partial_spec) 4971 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc); 4972 4973 HasExplicitTemplateArgs = false; 4974 } else if (!isFunctionTemplateSpecialization && 4975 !D.getDeclSpec().isFriendSpecified()) { 4976 // We have encountered something that the user meant to be a 4977 // specialization (because it has explicitly-specified template 4978 // arguments) but that was not introduced with a "template<>" (or had 4979 // too few of them). 4980 Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header) 4981 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc) 4982 << FixItHint::CreateInsertion( 4983 D.getDeclSpec().getSourceRange().getBegin(), 4984 "template<> "); 4985 isFunctionTemplateSpecialization = true; 4986 } else { 4987 // "friend void foo<>(int);" is an implicit specialization decl. 4988 isFunctionTemplateSpecialization = true; 4989 } 4990 } else if (isFriend && isFunctionTemplateSpecialization) { 4991 // This combination is only possible in a recovery case; the user 4992 // wrote something like: 4993 // template <> friend void foo(int); 4994 // which we're recovering from as if the user had written: 4995 // friend void foo<>(int); 4996 // Go ahead and fake up a template id. 4997 HasExplicitTemplateArgs = true; 4998 TemplateArgs.setLAngleLoc(D.getIdentifierLoc()); 4999 TemplateArgs.setRAngleLoc(D.getIdentifierLoc()); 5000 } 5001 5002 // If it's a friend (and only if it's a friend), it's possible 5003 // that either the specialized function type or the specialized 5004 // template is dependent, and therefore matching will fail. In 5005 // this case, don't check the specialization yet. 5006 if (isFunctionTemplateSpecialization && isFriend && 5007 (NewFD->getType()->isDependentType() || DC->isDependentContext())) { 5008 assert(HasExplicitTemplateArgs && 5009 "friend function specialization without template args"); 5010 if (CheckDependentFunctionTemplateSpecialization(NewFD, TemplateArgs, 5011 Previous)) 5012 NewFD->setInvalidDecl(); 5013 } else if (isFunctionTemplateSpecialization) { 5014 if (CurContext->isDependentContext() && CurContext->isRecord() 5015 && !isFriend) { 5016 isDependentClassScopeExplicitSpecialization = true; 5017 Diag(NewFD->getLocation(), getLangOptions().MicrosoftExt ? 5018 diag::ext_function_specialization_in_class : 5019 diag::err_function_specialization_in_class) 5020 << NewFD->getDeclName(); 5021 } else if (CheckFunctionTemplateSpecialization(NewFD, 5022 (HasExplicitTemplateArgs ? &TemplateArgs : 0), 5023 Previous)) 5024 NewFD->setInvalidDecl(); 5025 5026 // C++ [dcl.stc]p1: 5027 // A storage-class-specifier shall not be specified in an explicit 5028 // specialization (14.7.3) 5029 if (SC != SC_None) { 5030 if (SC != NewFD->getStorageClass()) 5031 Diag(NewFD->getLocation(), 5032 diag::err_explicit_specialization_inconsistent_storage_class) 5033 << SC 5034 << FixItHint::CreateRemoval( 5035 D.getDeclSpec().getStorageClassSpecLoc()); 5036 5037 else 5038 Diag(NewFD->getLocation(), 5039 diag::ext_explicit_specialization_storage_class) 5040 << FixItHint::CreateRemoval( 5041 D.getDeclSpec().getStorageClassSpecLoc()); 5042 } 5043 5044 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD)) { 5045 if (CheckMemberSpecialization(NewFD, Previous)) 5046 NewFD->setInvalidDecl(); 5047 } 5048 5049 // Perform semantic checking on the function declaration. 5050 if (!isDependentClassScopeExplicitSpecialization) { 5051 if (NewFD->isInvalidDecl()) { 5052 // If this is a class member, mark the class invalid immediately. 5053 // This avoids some consistency errors later. 5054 if (CXXMethodDecl* methodDecl = dyn_cast<CXXMethodDecl>(NewFD)) 5055 methodDecl->getParent()->setInvalidDecl(); 5056 } else { 5057 if (NewFD->isMain()) 5058 CheckMain(NewFD, D.getDeclSpec()); 5059 CheckFunctionDeclaration(S, NewFD, Previous, isExplicitSpecialization, 5060 Redeclaration); 5061 } 5062 } 5063 5064 assert((NewFD->isInvalidDecl() || !Redeclaration || 5065 Previous.getResultKind() != LookupResult::FoundOverloaded) && 5066 "previous declaration set still overloaded"); 5067 5068 NamedDecl *PrincipalDecl = (FunctionTemplate 5069 ? cast<NamedDecl>(FunctionTemplate) 5070 : NewFD); 5071 5072 if (isFriend && Redeclaration) { 5073 AccessSpecifier Access = AS_public; 5074 if (!NewFD->isInvalidDecl()) 5075 Access = NewFD->getPreviousDeclaration()->getAccess(); 5076 5077 NewFD->setAccess(Access); 5078 if (FunctionTemplate) FunctionTemplate->setAccess(Access); 5079 5080 PrincipalDecl->setObjectOfFriendDecl(true); 5081 } 5082 5083 if (NewFD->isOverloadedOperator() && !DC->isRecord() && 5084 PrincipalDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary)) 5085 PrincipalDecl->setNonMemberOperator(); 5086 5087 // If we have a function template, check the template parameter 5088 // list. This will check and merge default template arguments. 5089 if (FunctionTemplate) { 5090 FunctionTemplateDecl *PrevTemplate = FunctionTemplate->getPreviousDeclaration(); 5091 CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(), 5092 PrevTemplate? PrevTemplate->getTemplateParameters() : 0, 5093 D.getDeclSpec().isFriendSpecified() 5094 ? (IsFunctionDefinition 5095 ? TPC_FriendFunctionTemplateDefinition 5096 : TPC_FriendFunctionTemplate) 5097 : (D.getCXXScopeSpec().isSet() && 5098 DC && DC->isRecord() && 5099 DC->isDependentContext()) 5100 ? TPC_ClassTemplateMember 5101 : TPC_FunctionTemplate); 5102 } 5103 5104 if (NewFD->isInvalidDecl()) { 5105 // Ignore all the rest of this. 5106 } else if (!Redeclaration) { 5107 // Fake up an access specifier if it's supposed to be a class member. 5108 if (isa<CXXRecordDecl>(NewFD->getDeclContext())) 5109 NewFD->setAccess(AS_public); 5110 5111 // Qualified decls generally require a previous declaration. 5112 if (D.getCXXScopeSpec().isSet()) { 5113 // ...with the major exception of templated-scope or 5114 // dependent-scope friend declarations. 5115 5116 // TODO: we currently also suppress this check in dependent 5117 // contexts because (1) the parameter depth will be off when 5118 // matching friend templates and (2) we might actually be 5119 // selecting a friend based on a dependent factor. But there 5120 // are situations where these conditions don't apply and we 5121 // can actually do this check immediately. 5122 if (isFriend && 5123 (TemplateParamLists.size() || 5124 D.getCXXScopeSpec().getScopeRep()->isDependent() || 5125 CurContext->isDependentContext())) { 5126 // ignore these 5127 } else { 5128 // The user tried to provide an out-of-line definition for a 5129 // function that is a member of a class or namespace, but there 5130 // was no such member function declared (C++ [class.mfct]p2, 5131 // C++ [namespace.memdef]p2). For example: 5132 // 5133 // class X { 5134 // void f() const; 5135 // }; 5136 // 5137 // void X::f() { } // ill-formed 5138 // 5139 // Complain about this problem, and attempt to suggest close 5140 // matches (e.g., those that differ only in cv-qualifiers and 5141 // whether the parameter types are references). 5142 5143 DiagnoseInvalidRedeclaration(*this, NewFD, false); 5144 } 5145 5146 // Unqualified local friend declarations are required to resolve 5147 // to something. 5148 } else if (isFriend && cast<CXXRecordDecl>(CurContext)->isLocalClass()) { 5149 DiagnoseInvalidRedeclaration(*this, NewFD, true); 5150 } 5151 5152 } else if (!IsFunctionDefinition && D.getCXXScopeSpec().isSet() && 5153 !isFriend && !isFunctionTemplateSpecialization && 5154 !isExplicitSpecialization) { 5155 // An out-of-line member function declaration must also be a 5156 // definition (C++ [dcl.meaning]p1). 5157 // Note that this is not the case for explicit specializations of 5158 // function templates or member functions of class templates, per 5159 // C++ [temp.expl.spec]p2. We also allow these declarations as an extension 5160 // for compatibility with old SWIG code which likes to generate them. 5161 Diag(NewFD->getLocation(), diag::ext_out_of_line_declaration) 5162 << D.getCXXScopeSpec().getRange(); 5163 } 5164 } 5165 5166 5167 // Handle attributes. We need to have merged decls when handling attributes 5168 // (for example to check for conflicts, etc). 5169 // FIXME: This needs to happen before we merge declarations. Then, 5170 // let attribute merging cope with attribute conflicts. 5171 ProcessDeclAttributes(S, NewFD, D, 5172 /*NonInheritable=*/false, /*Inheritable=*/true); 5173 5174 // attributes declared post-definition are currently ignored 5175 // FIXME: This should happen during attribute merging 5176 if (Redeclaration && Previous.isSingleResult()) { 5177 const FunctionDecl *Def; 5178 FunctionDecl *PrevFD = dyn_cast<FunctionDecl>(Previous.getFoundDecl()); 5179 if (PrevFD && PrevFD->isDefined(Def) && D.hasAttributes()) { 5180 Diag(NewFD->getLocation(), diag::warn_attribute_precede_definition); 5181 Diag(Def->getLocation(), diag::note_previous_definition); 5182 } 5183 } 5184 5185 AddKnownFunctionAttributes(NewFD); 5186 5187 if (NewFD->hasAttr<OverloadableAttr>() && 5188 !NewFD->getType()->getAs<FunctionProtoType>()) { 5189 Diag(NewFD->getLocation(), 5190 diag::err_attribute_overloadable_no_prototype) 5191 << NewFD; 5192 5193 // Turn this into a variadic function with no parameters. 5194 const FunctionType *FT = NewFD->getType()->getAs<FunctionType>(); 5195 FunctionProtoType::ExtProtoInfo EPI; 5196 EPI.Variadic = true; 5197 EPI.ExtInfo = FT->getExtInfo(); 5198 5199 QualType R = Context.getFunctionType(FT->getResultType(), 0, 0, EPI); 5200 NewFD->setType(R); 5201 } 5202 5203 // If there's a #pragma GCC visibility in scope, and this isn't a class 5204 // member, set the visibility of this function. 5205 if (NewFD->getLinkage() == ExternalLinkage && !DC->isRecord()) 5206 AddPushedVisibilityAttribute(NewFD); 5207 5208 // If this is a locally-scoped extern C function, update the 5209 // map of such names. 5210 if (CurContext->isFunctionOrMethod() && NewFD->isExternC() 5211 && !NewFD->isInvalidDecl()) 5212 RegisterLocallyScopedExternCDecl(NewFD, Previous, S); 5213 5214 // Set this FunctionDecl's range up to the right paren. 5215 NewFD->setRangeEnd(D.getSourceRange().getEnd()); 5216 5217 if (getLangOptions().CPlusPlus) { 5218 if (FunctionTemplate) { 5219 if (NewFD->isInvalidDecl()) 5220 FunctionTemplate->setInvalidDecl(); 5221 return FunctionTemplate; 5222 } 5223 } 5224 5225 MarkUnusedFileScopedDecl(NewFD); 5226 5227 if (getLangOptions().CUDA) 5228 if (IdentifierInfo *II = NewFD->getIdentifier()) 5229 if (!NewFD->isInvalidDecl() && 5230 NewFD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 5231 if (II->isStr("cudaConfigureCall")) { 5232 if (!R->getAs<FunctionType>()->getResultType()->isScalarType()) 5233 Diag(NewFD->getLocation(), diag::err_config_scalar_return); 5234 5235 Context.setcudaConfigureCallDecl(NewFD); 5236 } 5237 } 5238 5239 // Here we have an function template explicit specialization at class scope. 5240 // The actually specialization will be postponed to template instatiation 5241 // time via the ClassScopeFunctionSpecializationDecl node. 5242 if (isDependentClassScopeExplicitSpecialization) { 5243 ClassScopeFunctionSpecializationDecl *NewSpec = 5244 ClassScopeFunctionSpecializationDecl::Create( 5245 Context, CurContext, SourceLocation(), 5246 cast<CXXMethodDecl>(NewFD)); 5247 CurContext->addDecl(NewSpec); 5248 AddToScope = false; 5249 } 5250 5251 return NewFD; 5252} 5253 5254/// \brief Perform semantic checking of a new function declaration. 5255/// 5256/// Performs semantic analysis of the new function declaration 5257/// NewFD. This routine performs all semantic checking that does not 5258/// require the actual declarator involved in the declaration, and is 5259/// used both for the declaration of functions as they are parsed 5260/// (called via ActOnDeclarator) and for the declaration of functions 5261/// that have been instantiated via C++ template instantiation (called 5262/// via InstantiateDecl). 5263/// 5264/// \param IsExplicitSpecialiation whether this new function declaration is 5265/// an explicit specialization of the previous declaration. 5266/// 5267/// This sets NewFD->isInvalidDecl() to true if there was an error. 5268void Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD, 5269 LookupResult &Previous, 5270 bool IsExplicitSpecialization, 5271 bool &Redeclaration) { 5272 assert(!NewFD->getResultType()->isVariablyModifiedType() 5273 && "Variably modified return types are not handled here"); 5274 5275 // Check for a previous declaration of this name. 5276 if (Previous.empty() && NewFD->isExternC()) { 5277 // Since we did not find anything by this name and we're declaring 5278 // an extern "C" function, look for a non-visible extern "C" 5279 // declaration with the same name. 5280 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 5281 = findLocallyScopedExternalDecl(NewFD->getDeclName()); 5282 if (Pos != LocallyScopedExternalDecls.end()) 5283 Previous.addDecl(Pos->second); 5284 } 5285 5286 // Merge or overload the declaration with an existing declaration of 5287 // the same name, if appropriate. 5288 if (!Previous.empty()) { 5289 // Determine whether NewFD is an overload of PrevDecl or 5290 // a declaration that requires merging. If it's an overload, 5291 // there's no more work to do here; we'll just add the new 5292 // function to the scope. 5293 5294 NamedDecl *OldDecl = 0; 5295 if (!AllowOverloadingOfFunction(Previous, Context)) { 5296 Redeclaration = true; 5297 OldDecl = Previous.getFoundDecl(); 5298 } else { 5299 switch (CheckOverload(S, NewFD, Previous, OldDecl, 5300 /*NewIsUsingDecl*/ false)) { 5301 case Ovl_Match: 5302 Redeclaration = true; 5303 break; 5304 5305 case Ovl_NonFunction: 5306 Redeclaration = true; 5307 break; 5308 5309 case Ovl_Overload: 5310 Redeclaration = false; 5311 break; 5312 } 5313 5314 if (!getLangOptions().CPlusPlus && !NewFD->hasAttr<OverloadableAttr>()) { 5315 // If a function name is overloadable in C, then every function 5316 // with that name must be marked "overloadable". 5317 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 5318 << Redeclaration << NewFD; 5319 NamedDecl *OverloadedDecl = 0; 5320 if (Redeclaration) 5321 OverloadedDecl = OldDecl; 5322 else if (!Previous.empty()) 5323 OverloadedDecl = Previous.getRepresentativeDecl(); 5324 if (OverloadedDecl) 5325 Diag(OverloadedDecl->getLocation(), 5326 diag::note_attribute_overloadable_prev_overload); 5327 NewFD->addAttr(::new (Context) OverloadableAttr(SourceLocation(), 5328 Context)); 5329 } 5330 } 5331 5332 if (Redeclaration) { 5333 // NewFD and OldDecl represent declarations that need to be 5334 // merged. 5335 if (MergeFunctionDecl(NewFD, OldDecl)) 5336 return NewFD->setInvalidDecl(); 5337 5338 Previous.clear(); 5339 Previous.addDecl(OldDecl); 5340 5341 if (FunctionTemplateDecl *OldTemplateDecl 5342 = dyn_cast<FunctionTemplateDecl>(OldDecl)) { 5343 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl()); 5344 FunctionTemplateDecl *NewTemplateDecl 5345 = NewFD->getDescribedFunctionTemplate(); 5346 assert(NewTemplateDecl && "Template/non-template mismatch"); 5347 if (CXXMethodDecl *Method 5348 = dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) { 5349 Method->setAccess(OldTemplateDecl->getAccess()); 5350 NewTemplateDecl->setAccess(OldTemplateDecl->getAccess()); 5351 } 5352 5353 // If this is an explicit specialization of a member that is a function 5354 // template, mark it as a member specialization. 5355 if (IsExplicitSpecialization && 5356 NewTemplateDecl->getInstantiatedFromMemberTemplate()) { 5357 NewTemplateDecl->setMemberSpecialization(); 5358 assert(OldTemplateDecl->isMemberSpecialization()); 5359 } 5360 5361 if (OldTemplateDecl->isModulePrivate()) 5362 NewTemplateDecl->setModulePrivate(); 5363 5364 } else { 5365 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions 5366 NewFD->setAccess(OldDecl->getAccess()); 5367 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 5368 } 5369 } 5370 } 5371 5372 // Semantic checking for this function declaration (in isolation). 5373 if (getLangOptions().CPlusPlus) { 5374 // C++-specific checks. 5375 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { 5376 CheckConstructor(Constructor); 5377 } else if (CXXDestructorDecl *Destructor = 5378 dyn_cast<CXXDestructorDecl>(NewFD)) { 5379 CXXRecordDecl *Record = Destructor->getParent(); 5380 QualType ClassType = Context.getTypeDeclType(Record); 5381 5382 // FIXME: Shouldn't we be able to perform this check even when the class 5383 // type is dependent? Both gcc and edg can handle that. 5384 if (!ClassType->isDependentType()) { 5385 DeclarationName Name 5386 = Context.DeclarationNames.getCXXDestructorName( 5387 Context.getCanonicalType(ClassType)); 5388 if (NewFD->getDeclName() != Name) { 5389 Diag(NewFD->getLocation(), diag::err_destructor_name); 5390 return NewFD->setInvalidDecl(); 5391 } 5392 } 5393 } else if (CXXConversionDecl *Conversion 5394 = dyn_cast<CXXConversionDecl>(NewFD)) { 5395 ActOnConversionDeclarator(Conversion); 5396 } 5397 5398 // Find any virtual functions that this function overrides. 5399 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) { 5400 if (!Method->isFunctionTemplateSpecialization() && 5401 !Method->getDescribedFunctionTemplate()) { 5402 if (AddOverriddenMethods(Method->getParent(), Method)) { 5403 // If the function was marked as "static", we have a problem. 5404 if (NewFD->getStorageClass() == SC_Static) { 5405 Diag(NewFD->getLocation(), diag::err_static_overrides_virtual) 5406 << NewFD->getDeclName(); 5407 for (CXXMethodDecl::method_iterator 5408 Overridden = Method->begin_overridden_methods(), 5409 OverriddenEnd = Method->end_overridden_methods(); 5410 Overridden != OverriddenEnd; 5411 ++Overridden) { 5412 Diag((*Overridden)->getLocation(), 5413 diag::note_overridden_virtual_function); 5414 } 5415 } 5416 } 5417 } 5418 } 5419 5420 // Extra checking for C++ overloaded operators (C++ [over.oper]). 5421 if (NewFD->isOverloadedOperator() && 5422 CheckOverloadedOperatorDeclaration(NewFD)) 5423 return NewFD->setInvalidDecl(); 5424 5425 // Extra checking for C++0x literal operators (C++0x [over.literal]). 5426 if (NewFD->getLiteralIdentifier() && 5427 CheckLiteralOperatorDeclaration(NewFD)) 5428 return NewFD->setInvalidDecl(); 5429 5430 // In C++, check default arguments now that we have merged decls. Unless 5431 // the lexical context is the class, because in this case this is done 5432 // during delayed parsing anyway. 5433 if (!CurContext->isRecord()) 5434 CheckCXXDefaultArguments(NewFD); 5435 5436 // If this function declares a builtin function, check the type of this 5437 // declaration against the expected type for the builtin. 5438 if (unsigned BuiltinID = NewFD->getBuiltinID()) { 5439 ASTContext::GetBuiltinTypeError Error; 5440 QualType T = Context.GetBuiltinType(BuiltinID, Error); 5441 if (!T.isNull() && !Context.hasSameType(T, NewFD->getType())) { 5442 // The type of this function differs from the type of the builtin, 5443 // so forget about the builtin entirely. 5444 Context.BuiltinInfo.ForgetBuiltin(BuiltinID, Context.Idents); 5445 } 5446 } 5447 } 5448} 5449 5450void Sema::CheckMain(FunctionDecl* FD, const DeclSpec& DS) { 5451 // C++ [basic.start.main]p3: A program that declares main to be inline 5452 // or static is ill-formed. 5453 // C99 6.7.4p4: In a hosted environment, the inline function specifier 5454 // shall not appear in a declaration of main. 5455 // static main is not an error under C99, but we should warn about it. 5456 if (FD->getStorageClass() == SC_Static) 5457 Diag(DS.getStorageClassSpecLoc(), getLangOptions().CPlusPlus 5458 ? diag::err_static_main : diag::warn_static_main) 5459 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc()); 5460 if (FD->isInlineSpecified()) 5461 Diag(DS.getInlineSpecLoc(), diag::err_inline_main) 5462 << FixItHint::CreateRemoval(DS.getInlineSpecLoc()); 5463 5464 QualType T = FD->getType(); 5465 assert(T->isFunctionType() && "function decl is not of function type"); 5466 const FunctionType* FT = T->getAs<FunctionType>(); 5467 5468 if (!Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) { 5469 Diag(FD->getTypeSpecStartLoc(), diag::err_main_returns_nonint); 5470 FD->setInvalidDecl(true); 5471 } 5472 5473 // Treat protoless main() as nullary. 5474 if (isa<FunctionNoProtoType>(FT)) return; 5475 5476 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT); 5477 unsigned nparams = FTP->getNumArgs(); 5478 assert(FD->getNumParams() == nparams); 5479 5480 bool HasExtraParameters = (nparams > 3); 5481 5482 // Darwin passes an undocumented fourth argument of type char**. If 5483 // other platforms start sprouting these, the logic below will start 5484 // getting shifty. 5485 if (nparams == 4 && Context.getTargetInfo().getTriple().isOSDarwin()) 5486 HasExtraParameters = false; 5487 5488 if (HasExtraParameters) { 5489 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams; 5490 FD->setInvalidDecl(true); 5491 nparams = 3; 5492 } 5493 5494 // FIXME: a lot of the following diagnostics would be improved 5495 // if we had some location information about types. 5496 5497 QualType CharPP = 5498 Context.getPointerType(Context.getPointerType(Context.CharTy)); 5499 QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP }; 5500 5501 for (unsigned i = 0; i < nparams; ++i) { 5502 QualType AT = FTP->getArgType(i); 5503 5504 bool mismatch = true; 5505 5506 if (Context.hasSameUnqualifiedType(AT, Expected[i])) 5507 mismatch = false; 5508 else if (Expected[i] == CharPP) { 5509 // As an extension, the following forms are okay: 5510 // char const ** 5511 // char const * const * 5512 // char * const * 5513 5514 QualifierCollector qs; 5515 const PointerType* PT; 5516 if ((PT = qs.strip(AT)->getAs<PointerType>()) && 5517 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) && 5518 (QualType(qs.strip(PT->getPointeeType()), 0) == Context.CharTy)) { 5519 qs.removeConst(); 5520 mismatch = !qs.empty(); 5521 } 5522 } 5523 5524 if (mismatch) { 5525 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i]; 5526 // TODO: suggest replacing given type with expected type 5527 FD->setInvalidDecl(true); 5528 } 5529 } 5530 5531 if (nparams == 1 && !FD->isInvalidDecl()) { 5532 Diag(FD->getLocation(), diag::warn_main_one_arg); 5533 } 5534 5535 if (!FD->isInvalidDecl() && FD->getDescribedFunctionTemplate()) { 5536 Diag(FD->getLocation(), diag::err_main_template_decl); 5537 FD->setInvalidDecl(); 5538 } 5539} 5540 5541bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 5542 // FIXME: Need strict checking. In C89, we need to check for 5543 // any assignment, increment, decrement, function-calls, or 5544 // commas outside of a sizeof. In C99, it's the same list, 5545 // except that the aforementioned are allowed in unevaluated 5546 // expressions. Everything else falls under the 5547 // "may accept other forms of constant expressions" exception. 5548 // (We never end up here for C++, so the constant expression 5549 // rules there don't matter.) 5550 if (Init->isConstantInitializer(Context, false)) 5551 return false; 5552 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 5553 << Init->getSourceRange(); 5554 return true; 5555} 5556 5557namespace { 5558 // Visits an initialization expression to see if OrigDecl is evaluated in 5559 // its own initialization and throws a warning if it does. 5560 class SelfReferenceChecker 5561 : public EvaluatedExprVisitor<SelfReferenceChecker> { 5562 Sema &S; 5563 Decl *OrigDecl; 5564 bool isRecordType; 5565 bool isPODType; 5566 5567 public: 5568 typedef EvaluatedExprVisitor<SelfReferenceChecker> Inherited; 5569 5570 SelfReferenceChecker(Sema &S, Decl *OrigDecl) : Inherited(S.Context), 5571 S(S), OrigDecl(OrigDecl) { 5572 isPODType = false; 5573 isRecordType = false; 5574 if (ValueDecl *VD = dyn_cast<ValueDecl>(OrigDecl)) { 5575 isPODType = VD->getType().isPODType(S.Context); 5576 isRecordType = VD->getType()->isRecordType(); 5577 } 5578 } 5579 5580 void VisitExpr(Expr *E) { 5581 if (isa<ObjCMessageExpr>(*E)) return; 5582 if (isRecordType) { 5583 Expr *expr = E; 5584 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 5585 ValueDecl *VD = ME->getMemberDecl(); 5586 if (isa<EnumConstantDecl>(VD) || isa<VarDecl>(VD)) return; 5587 expr = ME->getBase(); 5588 } 5589 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(expr)) { 5590 HandleDeclRefExpr(DRE); 5591 return; 5592 } 5593 } 5594 Inherited::VisitExpr(E); 5595 } 5596 5597 void VisitMemberExpr(MemberExpr *E) { 5598 if (E->getType()->canDecayToPointerType()) return; 5599 if (isa<FieldDecl>(E->getMemberDecl())) 5600 if (DeclRefExpr *DRE 5601 = dyn_cast<DeclRefExpr>(E->getBase()->IgnoreParenImpCasts())) { 5602 HandleDeclRefExpr(DRE); 5603 return; 5604 } 5605 Inherited::VisitMemberExpr(E); 5606 } 5607 5608 void VisitImplicitCastExpr(ImplicitCastExpr *E) { 5609 if ((!isRecordType &&E->getCastKind() == CK_LValueToRValue) || 5610 (isRecordType && E->getCastKind() == CK_NoOp)) { 5611 Expr* SubExpr = E->getSubExpr()->IgnoreParenImpCasts(); 5612 if (MemberExpr *ME = dyn_cast<MemberExpr>(SubExpr)) 5613 SubExpr = ME->getBase()->IgnoreParenImpCasts(); 5614 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(SubExpr)) { 5615 HandleDeclRefExpr(DRE); 5616 return; 5617 } 5618 } 5619 Inherited::VisitImplicitCastExpr(E); 5620 } 5621 5622 void VisitUnaryOperator(UnaryOperator *E) { 5623 // For POD record types, addresses of its own members are well-defined. 5624 if (isRecordType && isPODType) return; 5625 Inherited::VisitUnaryOperator(E); 5626 } 5627 5628 void HandleDeclRefExpr(DeclRefExpr *DRE) { 5629 Decl* ReferenceDecl = DRE->getDecl(); 5630 if (OrigDecl != ReferenceDecl) return; 5631 LookupResult Result(S, DRE->getNameInfo(), Sema::LookupOrdinaryName, 5632 Sema::NotForRedeclaration); 5633 S.DiagRuntimeBehavior(DRE->getLocStart(), DRE, 5634 S.PDiag(diag::warn_uninit_self_reference_in_init) 5635 << Result.getLookupName() 5636 << OrigDecl->getLocation() 5637 << DRE->getSourceRange()); 5638 } 5639 }; 5640} 5641 5642/// CheckSelfReference - Warns if OrigDecl is used in expression E. 5643void Sema::CheckSelfReference(Decl* OrigDecl, Expr *E) { 5644 SelfReferenceChecker(*this, OrigDecl).VisitExpr(E); 5645} 5646 5647/// AddInitializerToDecl - Adds the initializer Init to the 5648/// declaration dcl. If DirectInit is true, this is C++ direct 5649/// initialization rather than copy initialization. 5650void Sema::AddInitializerToDecl(Decl *RealDecl, Expr *Init, 5651 bool DirectInit, bool TypeMayContainAuto) { 5652 // If there is no declaration, there was an error parsing it. Just ignore 5653 // the initializer. 5654 if (RealDecl == 0 || RealDecl->isInvalidDecl()) 5655 return; 5656 5657 // Check for self-references within variable initializers. 5658 if (VarDecl *vd = dyn_cast<VarDecl>(RealDecl)) { 5659 // Variables declared within a function/method body are handled 5660 // by a dataflow analysis. 5661 if (!vd->hasLocalStorage() && !vd->isStaticLocal()) 5662 CheckSelfReference(RealDecl, Init); 5663 } 5664 else { 5665 CheckSelfReference(RealDecl, Init); 5666 } 5667 5668 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 5669 // With declarators parsed the way they are, the parser cannot 5670 // distinguish between a normal initializer and a pure-specifier. 5671 // Thus this grotesque test. 5672 IntegerLiteral *IL; 5673 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 5674 Context.getCanonicalType(IL->getType()) == Context.IntTy) 5675 CheckPureMethod(Method, Init->getSourceRange()); 5676 else { 5677 Diag(Method->getLocation(), diag::err_member_function_initialization) 5678 << Method->getDeclName() << Init->getSourceRange(); 5679 Method->setInvalidDecl(); 5680 } 5681 return; 5682 } 5683 5684 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 5685 if (!VDecl) { 5686 assert(!isa<FieldDecl>(RealDecl) && "field init shouldn't get here"); 5687 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 5688 RealDecl->setInvalidDecl(); 5689 return; 5690 } 5691 5692 // C++0x [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 5693 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 5694 TypeSourceInfo *DeducedType = 0; 5695 if (!DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType)) 5696 Diag(VDecl->getLocation(), diag::err_auto_var_deduction_failure) 5697 << VDecl->getDeclName() << VDecl->getType() << Init->getType() 5698 << Init->getSourceRange(); 5699 if (!DeducedType) { 5700 RealDecl->setInvalidDecl(); 5701 return; 5702 } 5703 VDecl->setTypeSourceInfo(DeducedType); 5704 VDecl->setType(DeducedType->getType()); 5705 5706 // In ARC, infer lifetime. 5707 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(VDecl)) 5708 VDecl->setInvalidDecl(); 5709 5710 // If this is a redeclaration, check that the type we just deduced matches 5711 // the previously declared type. 5712 if (VarDecl *Old = VDecl->getPreviousDeclaration()) 5713 MergeVarDeclTypes(VDecl, Old); 5714 } 5715 5716 5717 // A definition must end up with a complete type, which means it must be 5718 // complete with the restriction that an array type might be completed by the 5719 // initializer; note that later code assumes this restriction. 5720 QualType BaseDeclType = VDecl->getType(); 5721 if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType)) 5722 BaseDeclType = Array->getElementType(); 5723 if (RequireCompleteType(VDecl->getLocation(), BaseDeclType, 5724 diag::err_typecheck_decl_incomplete_type)) { 5725 RealDecl->setInvalidDecl(); 5726 return; 5727 } 5728 5729 // The variable can not have an abstract class type. 5730 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 5731 diag::err_abstract_type_in_decl, 5732 AbstractVariableType)) 5733 VDecl->setInvalidDecl(); 5734 5735 const VarDecl *Def; 5736 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 5737 Diag(VDecl->getLocation(), diag::err_redefinition) 5738 << VDecl->getDeclName(); 5739 Diag(Def->getLocation(), diag::note_previous_definition); 5740 VDecl->setInvalidDecl(); 5741 return; 5742 } 5743 5744 const VarDecl* PrevInit = 0; 5745 if (getLangOptions().CPlusPlus) { 5746 // C++ [class.static.data]p4 5747 // If a static data member is of const integral or const 5748 // enumeration type, its declaration in the class definition can 5749 // specify a constant-initializer which shall be an integral 5750 // constant expression (5.19). In that case, the member can appear 5751 // in integral constant expressions. The member shall still be 5752 // defined in a namespace scope if it is used in the program and the 5753 // namespace scope definition shall not contain an initializer. 5754 // 5755 // We already performed a redefinition check above, but for static 5756 // data members we also need to check whether there was an in-class 5757 // declaration with an initializer. 5758 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 5759 Diag(VDecl->getLocation(), diag::err_redefinition) << VDecl->getDeclName(); 5760 Diag(PrevInit->getLocation(), diag::note_previous_definition); 5761 return; 5762 } 5763 5764 if (VDecl->hasLocalStorage()) 5765 getCurFunction()->setHasBranchProtectedScope(); 5766 5767 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) { 5768 VDecl->setInvalidDecl(); 5769 return; 5770 } 5771 } 5772 5773 // OpenCL 1.1 6.5.2: "Variables allocated in the __local address space inside 5774 // a kernel function cannot be initialized." 5775 if (VDecl->getStorageClass() == SC_OpenCLWorkGroupLocal) { 5776 Diag(VDecl->getLocation(), diag::err_local_cant_init); 5777 VDecl->setInvalidDecl(); 5778 return; 5779 } 5780 5781 // Capture the variable that is being initialized and the style of 5782 // initialization. 5783 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 5784 5785 // FIXME: Poor source location information. 5786 InitializationKind Kind 5787 = DirectInit? InitializationKind::CreateDirect(VDecl->getLocation(), 5788 Init->getLocStart(), 5789 Init->getLocEnd()) 5790 : InitializationKind::CreateCopy(VDecl->getLocation(), 5791 Init->getLocStart()); 5792 5793 // Get the decls type and save a reference for later, since 5794 // CheckInitializerTypes may change it. 5795 QualType DclT = VDecl->getType(), SavT = DclT; 5796 if (VDecl->isLocalVarDecl()) { 5797 if (VDecl->hasExternalStorage()) { // C99 6.7.8p5 5798 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 5799 VDecl->setInvalidDecl(); 5800 } else if (!VDecl->isInvalidDecl()) { 5801 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 5802 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 5803 MultiExprArg(*this, &Init, 1), 5804 &DclT); 5805 if (Result.isInvalid()) { 5806 VDecl->setInvalidDecl(); 5807 return; 5808 } 5809 5810 Init = Result.takeAs<Expr>(); 5811 5812 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 5813 // Don't check invalid declarations to avoid emitting useless diagnostics. 5814 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 5815 if (VDecl->getStorageClass() == SC_Static) // C99 6.7.8p4. 5816 CheckForConstantInitializer(Init, DclT); 5817 } 5818 } 5819 } else if (VDecl->isStaticDataMember() && 5820 VDecl->getLexicalDeclContext()->isRecord()) { 5821 // This is an in-class initialization for a static data member, e.g., 5822 // 5823 // struct S { 5824 // static const int value = 17; 5825 // }; 5826 5827 // Try to perform the initialization regardless. 5828 if (!VDecl->isInvalidDecl()) { 5829 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 5830 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 5831 MultiExprArg(*this, &Init, 1), 5832 &DclT); 5833 if (Result.isInvalid()) { 5834 VDecl->setInvalidDecl(); 5835 return; 5836 } 5837 5838 Init = Result.takeAs<Expr>(); 5839 } 5840 5841 // C++ [class.mem]p4: 5842 // A member-declarator can contain a constant-initializer only 5843 // if it declares a static member (9.4) of const integral or 5844 // const enumeration type, see 9.4.2. 5845 QualType T = VDecl->getType(); 5846 5847 // Do nothing on dependent types. 5848 if (T->isDependentType()) { 5849 5850 // Require constness. 5851 } else if (!T.isConstQualified()) { 5852 Diag(VDecl->getLocation(), diag::err_in_class_initializer_non_const) 5853 << Init->getSourceRange(); 5854 VDecl->setInvalidDecl(); 5855 5856 // We allow integer constant expressions in all cases. 5857 } else if (T->isIntegralOrEnumerationType()) { 5858 // Check whether the expression is a constant expression. 5859 SourceLocation Loc; 5860 if (Init->isValueDependent()) 5861 ; // Nothing to check. 5862 else if (Init->isIntegerConstantExpr(Context, &Loc)) 5863 ; // Ok, it's an ICE! 5864 else if (Init->isEvaluatable(Context)) { 5865 // If we can constant fold the initializer through heroics, accept it, 5866 // but report this as a use of an extension for -pedantic. 5867 Diag(Loc, diag::ext_in_class_initializer_non_constant) 5868 << Init->getSourceRange(); 5869 } else { 5870 // Otherwise, this is some crazy unknown case. Report the issue at the 5871 // location provided by the isIntegerConstantExpr failed check. 5872 Diag(Loc, diag::err_in_class_initializer_non_constant) 5873 << Init->getSourceRange(); 5874 VDecl->setInvalidDecl(); 5875 } 5876 5877 // We allow floating-point constants as an extension in C++03, and 5878 // C++0x has far more complicated rules that we don't really 5879 // implement fully. 5880 } else { 5881 bool Allowed = false; 5882 if (getLangOptions().CPlusPlus0x) { 5883 Allowed = T->isLiteralType(); 5884 } else if (T->isFloatingType()) { // also permits complex, which is ok 5885 Diag(VDecl->getLocation(), diag::ext_in_class_initializer_float_type) 5886 << T << Init->getSourceRange(); 5887 Allowed = true; 5888 } 5889 5890 if (!Allowed) { 5891 Diag(VDecl->getLocation(), diag::err_in_class_initializer_bad_type) 5892 << T << Init->getSourceRange(); 5893 VDecl->setInvalidDecl(); 5894 5895 // TODO: there are probably expressions that pass here that shouldn't. 5896 } else if (!Init->isValueDependent() && 5897 !Init->isConstantInitializer(Context, false)) { 5898 Diag(Init->getExprLoc(), diag::err_in_class_initializer_non_constant) 5899 << Init->getSourceRange(); 5900 VDecl->setInvalidDecl(); 5901 } 5902 } 5903 } else if (VDecl->isFileVarDecl()) { 5904 if (VDecl->getStorageClassAsWritten() == SC_Extern && 5905 (!getLangOptions().CPlusPlus || 5906 !Context.getBaseElementType(VDecl->getType()).isConstQualified())) 5907 Diag(VDecl->getLocation(), diag::warn_extern_init); 5908 if (!VDecl->isInvalidDecl()) { 5909 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 5910 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 5911 MultiExprArg(*this, &Init, 1), 5912 &DclT); 5913 if (Result.isInvalid()) { 5914 VDecl->setInvalidDecl(); 5915 return; 5916 } 5917 5918 Init = Result.takeAs<Expr>(); 5919 } 5920 5921 // C++ 3.6.2p2, allow dynamic initialization of static initializers. 5922 // Don't check invalid declarations to avoid emitting useless diagnostics. 5923 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) { 5924 // C99 6.7.8p4. All file scoped initializers need to be constant. 5925 CheckForConstantInitializer(Init, DclT); 5926 } 5927 } 5928 // If the type changed, it means we had an incomplete type that was 5929 // completed by the initializer. For example: 5930 // int ary[] = { 1, 3, 5 }; 5931 // "ary" transitions from a VariableArrayType to a ConstantArrayType. 5932 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 5933 VDecl->setType(DclT); 5934 Init->setType(DclT); 5935 } 5936 5937 // Check any implicit conversions within the expression. 5938 CheckImplicitConversions(Init, VDecl->getLocation()); 5939 5940 if (!VDecl->isInvalidDecl()) 5941 checkUnsafeAssigns(VDecl->getLocation(), VDecl->getType(), Init); 5942 5943 Init = MaybeCreateExprWithCleanups(Init); 5944 // Attach the initializer to the decl. 5945 VDecl->setInit(Init); 5946 5947 CheckCompleteVariableDeclaration(VDecl); 5948} 5949 5950/// ActOnInitializerError - Given that there was an error parsing an 5951/// initializer for the given declaration, try to return to some form 5952/// of sanity. 5953void Sema::ActOnInitializerError(Decl *D) { 5954 // Our main concern here is re-establishing invariants like "a 5955 // variable's type is either dependent or complete". 5956 if (!D || D->isInvalidDecl()) return; 5957 5958 VarDecl *VD = dyn_cast<VarDecl>(D); 5959 if (!VD) return; 5960 5961 // Auto types are meaningless if we can't make sense of the initializer. 5962 if (ParsingInitForAutoVars.count(D)) { 5963 D->setInvalidDecl(); 5964 return; 5965 } 5966 5967 QualType Ty = VD->getType(); 5968 if (Ty->isDependentType()) return; 5969 5970 // Require a complete type. 5971 if (RequireCompleteType(VD->getLocation(), 5972 Context.getBaseElementType(Ty), 5973 diag::err_typecheck_decl_incomplete_type)) { 5974 VD->setInvalidDecl(); 5975 return; 5976 } 5977 5978 // Require an abstract type. 5979 if (RequireNonAbstractType(VD->getLocation(), Ty, 5980 diag::err_abstract_type_in_decl, 5981 AbstractVariableType)) { 5982 VD->setInvalidDecl(); 5983 return; 5984 } 5985 5986 // Don't bother complaining about constructors or destructors, 5987 // though. 5988} 5989 5990void Sema::ActOnUninitializedDecl(Decl *RealDecl, 5991 bool TypeMayContainAuto) { 5992 // If there is no declaration, there was an error parsing it. Just ignore it. 5993 if (RealDecl == 0) 5994 return; 5995 5996 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 5997 QualType Type = Var->getType(); 5998 5999 // C++0x [dcl.spec.auto]p3 6000 if (TypeMayContainAuto && Type->getContainedAutoType()) { 6001 Diag(Var->getLocation(), diag::err_auto_var_requires_init) 6002 << Var->getDeclName() << Type; 6003 Var->setInvalidDecl(); 6004 return; 6005 } 6006 6007 switch (Var->isThisDeclarationADefinition()) { 6008 case VarDecl::Definition: 6009 if (!Var->isStaticDataMember() || !Var->getAnyInitializer()) 6010 break; 6011 6012 // We have an out-of-line definition of a static data member 6013 // that has an in-class initializer, so we type-check this like 6014 // a declaration. 6015 // 6016 // Fall through 6017 6018 case VarDecl::DeclarationOnly: 6019 // It's only a declaration. 6020 6021 // Block scope. C99 6.7p7: If an identifier for an object is 6022 // declared with no linkage (C99 6.2.2p6), the type for the 6023 // object shall be complete. 6024 if (!Type->isDependentType() && Var->isLocalVarDecl() && 6025 !Var->getLinkage() && !Var->isInvalidDecl() && 6026 RequireCompleteType(Var->getLocation(), Type, 6027 diag::err_typecheck_decl_incomplete_type)) 6028 Var->setInvalidDecl(); 6029 6030 // Make sure that the type is not abstract. 6031 if (!Type->isDependentType() && !Var->isInvalidDecl() && 6032 RequireNonAbstractType(Var->getLocation(), Type, 6033 diag::err_abstract_type_in_decl, 6034 AbstractVariableType)) 6035 Var->setInvalidDecl(); 6036 return; 6037 6038 case VarDecl::TentativeDefinition: 6039 // File scope. C99 6.9.2p2: A declaration of an identifier for an 6040 // object that has file scope without an initializer, and without a 6041 // storage-class specifier or with the storage-class specifier "static", 6042 // constitutes a tentative definition. Note: A tentative definition with 6043 // external linkage is valid (C99 6.2.2p5). 6044 if (!Var->isInvalidDecl()) { 6045 if (const IncompleteArrayType *ArrayT 6046 = Context.getAsIncompleteArrayType(Type)) { 6047 if (RequireCompleteType(Var->getLocation(), 6048 ArrayT->getElementType(), 6049 diag::err_illegal_decl_array_incomplete_type)) 6050 Var->setInvalidDecl(); 6051 } else if (Var->getStorageClass() == SC_Static) { 6052 // C99 6.9.2p3: If the declaration of an identifier for an object is 6053 // a tentative definition and has internal linkage (C99 6.2.2p3), the 6054 // declared type shall not be an incomplete type. 6055 // NOTE: code such as the following 6056 // static struct s; 6057 // struct s { int a; }; 6058 // is accepted by gcc. Hence here we issue a warning instead of 6059 // an error and we do not invalidate the static declaration. 6060 // NOTE: to avoid multiple warnings, only check the first declaration. 6061 if (Var->getPreviousDeclaration() == 0) 6062 RequireCompleteType(Var->getLocation(), Type, 6063 diag::ext_typecheck_decl_incomplete_type); 6064 } 6065 } 6066 6067 // Record the tentative definition; we're done. 6068 if (!Var->isInvalidDecl()) 6069 TentativeDefinitions.push_back(Var); 6070 return; 6071 } 6072 6073 // Provide a specific diagnostic for uninitialized variable 6074 // definitions with incomplete array type. 6075 if (Type->isIncompleteArrayType()) { 6076 Diag(Var->getLocation(), 6077 diag::err_typecheck_incomplete_array_needs_initializer); 6078 Var->setInvalidDecl(); 6079 return; 6080 } 6081 6082 // Provide a specific diagnostic for uninitialized variable 6083 // definitions with reference type. 6084 if (Type->isReferenceType()) { 6085 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 6086 << Var->getDeclName() 6087 << SourceRange(Var->getLocation(), Var->getLocation()); 6088 Var->setInvalidDecl(); 6089 return; 6090 } 6091 6092 // Do not attempt to type-check the default initializer for a 6093 // variable with dependent type. 6094 if (Type->isDependentType()) 6095 return; 6096 6097 if (Var->isInvalidDecl()) 6098 return; 6099 6100 if (RequireCompleteType(Var->getLocation(), 6101 Context.getBaseElementType(Type), 6102 diag::err_typecheck_decl_incomplete_type)) { 6103 Var->setInvalidDecl(); 6104 return; 6105 } 6106 6107 // The variable can not have an abstract class type. 6108 if (RequireNonAbstractType(Var->getLocation(), Type, 6109 diag::err_abstract_type_in_decl, 6110 AbstractVariableType)) { 6111 Var->setInvalidDecl(); 6112 return; 6113 } 6114 6115 // Check for jumps past the implicit initializer. C++0x 6116 // clarifies that this applies to a "variable with automatic 6117 // storage duration", not a "local variable". 6118 // C++0x [stmt.dcl]p3 6119 // A program that jumps from a point where a variable with automatic 6120 // storage duration is not in scope to a point where it is in scope is 6121 // ill-formed unless the variable has scalar type, class type with a 6122 // trivial default constructor and a trivial destructor, a cv-qualified 6123 // version of one of these types, or an array of one of the preceding 6124 // types and is declared without an initializer. 6125 if (getLangOptions().CPlusPlus && Var->hasLocalStorage()) { 6126 if (const RecordType *Record 6127 = Context.getBaseElementType(Type)->getAs<RecordType>()) { 6128 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record->getDecl()); 6129 if ((!getLangOptions().CPlusPlus0x && !CXXRecord->isPOD()) || 6130 (getLangOptions().CPlusPlus0x && 6131 (!CXXRecord->hasTrivialDefaultConstructor() || 6132 !CXXRecord->hasTrivialDestructor()))) 6133 getCurFunction()->setHasBranchProtectedScope(); 6134 } 6135 } 6136 6137 // C++03 [dcl.init]p9: 6138 // If no initializer is specified for an object, and the 6139 // object is of (possibly cv-qualified) non-POD class type (or 6140 // array thereof), the object shall be default-initialized; if 6141 // the object is of const-qualified type, the underlying class 6142 // type shall have a user-declared default 6143 // constructor. Otherwise, if no initializer is specified for 6144 // a non- static object, the object and its subobjects, if 6145 // any, have an indeterminate initial value); if the object 6146 // or any of its subobjects are of const-qualified type, the 6147 // program is ill-formed. 6148 // C++0x [dcl.init]p11: 6149 // If no initializer is specified for an object, the object is 6150 // default-initialized; [...]. 6151 InitializedEntity Entity = InitializedEntity::InitializeVariable(Var); 6152 InitializationKind Kind 6153 = InitializationKind::CreateDefault(Var->getLocation()); 6154 6155 InitializationSequence InitSeq(*this, Entity, Kind, 0, 0); 6156 ExprResult Init = InitSeq.Perform(*this, Entity, Kind, 6157 MultiExprArg(*this, 0, 0)); 6158 if (Init.isInvalid()) 6159 Var->setInvalidDecl(); 6160 else if (Init.get()) 6161 Var->setInit(MaybeCreateExprWithCleanups(Init.get())); 6162 6163 CheckCompleteVariableDeclaration(Var); 6164 } 6165} 6166 6167void Sema::ActOnCXXForRangeDecl(Decl *D) { 6168 VarDecl *VD = dyn_cast<VarDecl>(D); 6169 if (!VD) { 6170 Diag(D->getLocation(), diag::err_for_range_decl_must_be_var); 6171 D->setInvalidDecl(); 6172 return; 6173 } 6174 6175 VD->setCXXForRangeDecl(true); 6176 6177 // for-range-declaration cannot be given a storage class specifier. 6178 int Error = -1; 6179 switch (VD->getStorageClassAsWritten()) { 6180 case SC_None: 6181 break; 6182 case SC_Extern: 6183 Error = 0; 6184 break; 6185 case SC_Static: 6186 Error = 1; 6187 break; 6188 case SC_PrivateExtern: 6189 Error = 2; 6190 break; 6191 case SC_Auto: 6192 Error = 3; 6193 break; 6194 case SC_Register: 6195 Error = 4; 6196 break; 6197 case SC_OpenCLWorkGroupLocal: 6198 llvm_unreachable("Unexpected storage class"); 6199 } 6200 // FIXME: constexpr isn't allowed here. 6201 //if (DS.isConstexprSpecified()) 6202 // Error = 5; 6203 if (Error != -1) { 6204 Diag(VD->getOuterLocStart(), diag::err_for_range_storage_class) 6205 << VD->getDeclName() << Error; 6206 D->setInvalidDecl(); 6207 } 6208} 6209 6210void Sema::CheckCompleteVariableDeclaration(VarDecl *var) { 6211 if (var->isInvalidDecl()) return; 6212 6213 // In ARC, don't allow jumps past the implicit initialization of a 6214 // local retaining variable. 6215 if (getLangOptions().ObjCAutoRefCount && 6216 var->hasLocalStorage()) { 6217 switch (var->getType().getObjCLifetime()) { 6218 case Qualifiers::OCL_None: 6219 case Qualifiers::OCL_ExplicitNone: 6220 case Qualifiers::OCL_Autoreleasing: 6221 break; 6222 6223 case Qualifiers::OCL_Weak: 6224 case Qualifiers::OCL_Strong: 6225 getCurFunction()->setHasBranchProtectedScope(); 6226 break; 6227 } 6228 } 6229 6230 // All the following checks are C++ only. 6231 if (!getLangOptions().CPlusPlus) return; 6232 6233 QualType baseType = Context.getBaseElementType(var->getType()); 6234 if (baseType->isDependentType()) return; 6235 6236 // __block variables might require us to capture a copy-initializer. 6237 if (var->hasAttr<BlocksAttr>()) { 6238 // It's currently invalid to ever have a __block variable with an 6239 // array type; should we diagnose that here? 6240 6241 // Regardless, we don't want to ignore array nesting when 6242 // constructing this copy. 6243 QualType type = var->getType(); 6244 6245 if (type->isStructureOrClassType()) { 6246 SourceLocation poi = var->getLocation(); 6247 Expr *varRef = new (Context) DeclRefExpr(var, type, VK_LValue, poi); 6248 ExprResult result = 6249 PerformCopyInitialization( 6250 InitializedEntity::InitializeBlock(poi, type, false), 6251 poi, Owned(varRef)); 6252 if (!result.isInvalid()) { 6253 result = MaybeCreateExprWithCleanups(result); 6254 Expr *init = result.takeAs<Expr>(); 6255 Context.setBlockVarCopyInits(var, init); 6256 } 6257 } 6258 } 6259 6260 // Check for global constructors. 6261 if (!var->getDeclContext()->isDependentContext() && 6262 var->hasGlobalStorage() && 6263 !var->isStaticLocal() && 6264 var->getInit() && 6265 !var->getInit()->isConstantInitializer(Context, 6266 baseType->isReferenceType())) 6267 Diag(var->getLocation(), diag::warn_global_constructor) 6268 << var->getInit()->getSourceRange(); 6269 6270 // Require the destructor. 6271 if (const RecordType *recordType = baseType->getAs<RecordType>()) 6272 FinalizeVarWithDestructor(var, recordType); 6273} 6274 6275/// FinalizeDeclaration - called by ParseDeclarationAfterDeclarator to perform 6276/// any semantic actions necessary after any initializer has been attached. 6277void 6278Sema::FinalizeDeclaration(Decl *ThisDecl) { 6279 // Note that we are no longer parsing the initializer for this declaration. 6280 ParsingInitForAutoVars.erase(ThisDecl); 6281} 6282 6283Sema::DeclGroupPtrTy 6284Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, 6285 Decl **Group, unsigned NumDecls) { 6286 SmallVector<Decl*, 8> Decls; 6287 6288 if (DS.isTypeSpecOwned()) 6289 Decls.push_back(DS.getRepAsDecl()); 6290 6291 for (unsigned i = 0; i != NumDecls; ++i) 6292 if (Decl *D = Group[i]) 6293 Decls.push_back(D); 6294 6295 return BuildDeclaratorGroup(Decls.data(), Decls.size(), 6296 DS.getTypeSpecType() == DeclSpec::TST_auto); 6297} 6298 6299/// BuildDeclaratorGroup - convert a list of declarations into a declaration 6300/// group, performing any necessary semantic checking. 6301Sema::DeclGroupPtrTy 6302Sema::BuildDeclaratorGroup(Decl **Group, unsigned NumDecls, 6303 bool TypeMayContainAuto) { 6304 // C++0x [dcl.spec.auto]p7: 6305 // If the type deduced for the template parameter U is not the same in each 6306 // deduction, the program is ill-formed. 6307 // FIXME: When initializer-list support is added, a distinction is needed 6308 // between the deduced type U and the deduced type which 'auto' stands for. 6309 // auto a = 0, b = { 1, 2, 3 }; 6310 // is legal because the deduced type U is 'int' in both cases. 6311 if (TypeMayContainAuto && NumDecls > 1) { 6312 QualType Deduced; 6313 CanQualType DeducedCanon; 6314 VarDecl *DeducedDecl = 0; 6315 for (unsigned i = 0; i != NumDecls; ++i) { 6316 if (VarDecl *D = dyn_cast<VarDecl>(Group[i])) { 6317 AutoType *AT = D->getType()->getContainedAutoType(); 6318 // Don't reissue diagnostics when instantiating a template. 6319 if (AT && D->isInvalidDecl()) 6320 break; 6321 if (AT && AT->isDeduced()) { 6322 QualType U = AT->getDeducedType(); 6323 CanQualType UCanon = Context.getCanonicalType(U); 6324 if (Deduced.isNull()) { 6325 Deduced = U; 6326 DeducedCanon = UCanon; 6327 DeducedDecl = D; 6328 } else if (DeducedCanon != UCanon) { 6329 Diag(D->getTypeSourceInfo()->getTypeLoc().getBeginLoc(), 6330 diag::err_auto_different_deductions) 6331 << Deduced << DeducedDecl->getDeclName() 6332 << U << D->getDeclName() 6333 << DeducedDecl->getInit()->getSourceRange() 6334 << D->getInit()->getSourceRange(); 6335 D->setInvalidDecl(); 6336 break; 6337 } 6338 } 6339 } 6340 } 6341 } 6342 6343 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, NumDecls)); 6344} 6345 6346 6347/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 6348/// to introduce parameters into function prototype scope. 6349Decl *Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 6350 const DeclSpec &DS = D.getDeclSpec(); 6351 6352 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 6353 VarDecl::StorageClass StorageClass = SC_None; 6354 VarDecl::StorageClass StorageClassAsWritten = SC_None; 6355 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 6356 StorageClass = SC_Register; 6357 StorageClassAsWritten = SC_Register; 6358 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 6359 Diag(DS.getStorageClassSpecLoc(), 6360 diag::err_invalid_storage_class_in_func_decl); 6361 D.getMutableDeclSpec().ClearStorageClassSpecs(); 6362 } 6363 6364 if (D.getDeclSpec().isThreadSpecified()) 6365 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 6366 if (D.getDeclSpec().isConstexprSpecified()) 6367 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 6368 << 0; 6369 6370 DiagnoseFunctionSpecifiers(D); 6371 6372 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6373 QualType parmDeclType = TInfo->getType(); 6374 6375 if (getLangOptions().CPlusPlus) { 6376 // Check that there are no default arguments inside the type of this 6377 // parameter. 6378 CheckExtraCXXDefaultArguments(D); 6379 6380 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 6381 if (D.getCXXScopeSpec().isSet()) { 6382 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 6383 << D.getCXXScopeSpec().getRange(); 6384 D.getCXXScopeSpec().clear(); 6385 } 6386 } 6387 6388 // Ensure we have a valid name 6389 IdentifierInfo *II = 0; 6390 if (D.hasName()) { 6391 II = D.getIdentifier(); 6392 if (!II) { 6393 Diag(D.getIdentifierLoc(), diag::err_bad_parameter_name) 6394 << GetNameForDeclarator(D).getName().getAsString(); 6395 D.setInvalidType(true); 6396 } 6397 } 6398 6399 // Check for redeclaration of parameters, e.g. int foo(int x, int x); 6400 if (II) { 6401 LookupResult R(*this, II, D.getIdentifierLoc(), LookupOrdinaryName, 6402 ForRedeclaration); 6403 LookupName(R, S); 6404 if (R.isSingleResult()) { 6405 NamedDecl *PrevDecl = R.getFoundDecl(); 6406 if (PrevDecl->isTemplateParameter()) { 6407 // Maybe we will complain about the shadowed template parameter. 6408 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 6409 // Just pretend that we didn't see the previous declaration. 6410 PrevDecl = 0; 6411 } else if (S->isDeclScope(PrevDecl)) { 6412 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 6413 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 6414 6415 // Recover by removing the name 6416 II = 0; 6417 D.SetIdentifier(0, D.getIdentifierLoc()); 6418 D.setInvalidType(true); 6419 } 6420 } 6421 } 6422 6423 // Temporarily put parameter variables in the translation unit, not 6424 // the enclosing context. This prevents them from accidentally 6425 // looking like class members in C++. 6426 ParmVarDecl *New = CheckParameter(Context.getTranslationUnitDecl(), 6427 D.getSourceRange().getBegin(), 6428 D.getIdentifierLoc(), II, 6429 parmDeclType, TInfo, 6430 StorageClass, StorageClassAsWritten); 6431 6432 if (D.isInvalidType()) 6433 New->setInvalidDecl(); 6434 6435 assert(S->isFunctionPrototypeScope()); 6436 assert(S->getFunctionPrototypeDepth() >= 1); 6437 New->setScopeInfo(S->getFunctionPrototypeDepth() - 1, 6438 S->getNextFunctionPrototypeIndex()); 6439 6440 // Add the parameter declaration into this scope. 6441 S->AddDecl(New); 6442 if (II) 6443 IdResolver.AddDecl(New); 6444 6445 ProcessDeclAttributes(S, New, D); 6446 6447 if (D.getDeclSpec().isModulePrivateSpecified()) 6448 Diag(New->getLocation(), diag::err_module_private_local) 6449 << 1 << New->getDeclName() 6450 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 6451 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 6452 6453 if (New->hasAttr<BlocksAttr>()) { 6454 Diag(New->getLocation(), diag::err_block_on_nonlocal); 6455 } 6456 return New; 6457} 6458 6459/// \brief Synthesizes a variable for a parameter arising from a 6460/// typedef. 6461ParmVarDecl *Sema::BuildParmVarDeclForTypedef(DeclContext *DC, 6462 SourceLocation Loc, 6463 QualType T) { 6464 /* FIXME: setting StartLoc == Loc. 6465 Would it be worth to modify callers so as to provide proper source 6466 location for the unnamed parameters, embedding the parameter's type? */ 6467 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, Loc, Loc, 0, 6468 T, Context.getTrivialTypeSourceInfo(T, Loc), 6469 SC_None, SC_None, 0); 6470 Param->setImplicit(); 6471 return Param; 6472} 6473 6474void Sema::DiagnoseUnusedParameters(ParmVarDecl * const *Param, 6475 ParmVarDecl * const *ParamEnd) { 6476 // Don't diagnose unused-parameter errors in template instantiations; we 6477 // will already have done so in the template itself. 6478 if (!ActiveTemplateInstantiations.empty()) 6479 return; 6480 6481 for (; Param != ParamEnd; ++Param) { 6482 if (!(*Param)->isUsed() && (*Param)->getDeclName() && 6483 !(*Param)->hasAttr<UnusedAttr>()) { 6484 Diag((*Param)->getLocation(), diag::warn_unused_parameter) 6485 << (*Param)->getDeclName(); 6486 } 6487 } 6488} 6489 6490void Sema::DiagnoseSizeOfParametersAndReturnValue(ParmVarDecl * const *Param, 6491 ParmVarDecl * const *ParamEnd, 6492 QualType ReturnTy, 6493 NamedDecl *D) { 6494 if (LangOpts.NumLargeByValueCopy == 0) // No check. 6495 return; 6496 6497 // Warn if the return value is pass-by-value and larger than the specified 6498 // threshold. 6499 if (ReturnTy.isPODType(Context)) { 6500 unsigned Size = Context.getTypeSizeInChars(ReturnTy).getQuantity(); 6501 if (Size > LangOpts.NumLargeByValueCopy) 6502 Diag(D->getLocation(), diag::warn_return_value_size) 6503 << D->getDeclName() << Size; 6504 } 6505 6506 // Warn if any parameter is pass-by-value and larger than the specified 6507 // threshold. 6508 for (; Param != ParamEnd; ++Param) { 6509 QualType T = (*Param)->getType(); 6510 if (!T.isPODType(Context)) 6511 continue; 6512 unsigned Size = Context.getTypeSizeInChars(T).getQuantity(); 6513 if (Size > LangOpts.NumLargeByValueCopy) 6514 Diag((*Param)->getLocation(), diag::warn_parameter_size) 6515 << (*Param)->getDeclName() << Size; 6516 } 6517} 6518 6519ParmVarDecl *Sema::CheckParameter(DeclContext *DC, SourceLocation StartLoc, 6520 SourceLocation NameLoc, IdentifierInfo *Name, 6521 QualType T, TypeSourceInfo *TSInfo, 6522 VarDecl::StorageClass StorageClass, 6523 VarDecl::StorageClass StorageClassAsWritten) { 6524 // In ARC, infer a lifetime qualifier for appropriate parameter types. 6525 if (getLangOptions().ObjCAutoRefCount && 6526 T.getObjCLifetime() == Qualifiers::OCL_None && 6527 T->isObjCLifetimeType()) { 6528 6529 Qualifiers::ObjCLifetime lifetime; 6530 6531 // Special cases for arrays: 6532 // - if it's const, use __unsafe_unretained 6533 // - otherwise, it's an error 6534 if (T->isArrayType()) { 6535 if (!T.isConstQualified()) { 6536 Diag(NameLoc, diag::err_arc_array_param_no_ownership) 6537 << TSInfo->getTypeLoc().getSourceRange(); 6538 } 6539 lifetime = Qualifiers::OCL_ExplicitNone; 6540 } else { 6541 lifetime = T->getObjCARCImplicitLifetime(); 6542 } 6543 T = Context.getLifetimeQualifiedType(T, lifetime); 6544 } 6545 6546 ParmVarDecl *New = ParmVarDecl::Create(Context, DC, StartLoc, NameLoc, Name, 6547 Context.getAdjustedParameterType(T), 6548 TSInfo, 6549 StorageClass, StorageClassAsWritten, 6550 0); 6551 6552 // Parameters can not be abstract class types. 6553 // For record types, this is done by the AbstractClassUsageDiagnoser once 6554 // the class has been completely parsed. 6555 if (!CurContext->isRecord() && 6556 RequireNonAbstractType(NameLoc, T, diag::err_abstract_type_in_decl, 6557 AbstractParamType)) 6558 New->setInvalidDecl(); 6559 6560 // Parameter declarators cannot be interface types. All ObjC objects are 6561 // passed by reference. 6562 if (T->isObjCObjectType()) { 6563 Diag(NameLoc, 6564 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T 6565 << FixItHint::CreateInsertion(NameLoc, "*"); 6566 T = Context.getObjCObjectPointerType(T); 6567 New->setType(T); 6568 } 6569 6570 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage 6571 // duration shall not be qualified by an address-space qualifier." 6572 // Since all parameters have automatic store duration, they can not have 6573 // an address space. 6574 if (T.getAddressSpace() != 0) { 6575 Diag(NameLoc, diag::err_arg_with_address_space); 6576 New->setInvalidDecl(); 6577 } 6578 6579 return New; 6580} 6581 6582void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 6583 SourceLocation LocAfterDecls) { 6584 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 6585 6586 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 6587 // for a K&R function. 6588 if (!FTI.hasPrototype) { 6589 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 6590 --i; 6591 if (FTI.ArgInfo[i].Param == 0) { 6592 llvm::SmallString<256> Code; 6593 llvm::raw_svector_ostream(Code) << " int " 6594 << FTI.ArgInfo[i].Ident->getName() 6595 << ";\n"; 6596 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 6597 << FTI.ArgInfo[i].Ident 6598 << FixItHint::CreateInsertion(LocAfterDecls, Code.str()); 6599 6600 // Implicitly declare the argument as type 'int' for lack of a better 6601 // type. 6602 AttributeFactory attrs; 6603 DeclSpec DS(attrs); 6604 const char* PrevSpec; // unused 6605 unsigned DiagID; // unused 6606 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 6607 PrevSpec, DiagID); 6608 Declarator ParamD(DS, Declarator::KNRTypeListContext); 6609 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 6610 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 6611 } 6612 } 6613 } 6614} 6615 6616Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, 6617 Declarator &D) { 6618 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 6619 assert(D.isFunctionDeclarator() && "Not a function declarator!"); 6620 Scope *ParentScope = FnBodyScope->getParent(); 6621 6622 Decl *DP = HandleDeclarator(ParentScope, D, 6623 MultiTemplateParamsArg(*this), 6624 /*IsFunctionDefinition=*/true); 6625 return ActOnStartOfFunctionDef(FnBodyScope, DP); 6626} 6627 6628static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD) { 6629 // Don't warn about invalid declarations. 6630 if (FD->isInvalidDecl()) 6631 return false; 6632 6633 // Or declarations that aren't global. 6634 if (!FD->isGlobal()) 6635 return false; 6636 6637 // Don't warn about C++ member functions. 6638 if (isa<CXXMethodDecl>(FD)) 6639 return false; 6640 6641 // Don't warn about 'main'. 6642 if (FD->isMain()) 6643 return false; 6644 6645 // Don't warn about inline functions. 6646 if (FD->isInlined()) 6647 return false; 6648 6649 // Don't warn about function templates. 6650 if (FD->getDescribedFunctionTemplate()) 6651 return false; 6652 6653 // Don't warn about function template specializations. 6654 if (FD->isFunctionTemplateSpecialization()) 6655 return false; 6656 6657 bool MissingPrototype = true; 6658 for (const FunctionDecl *Prev = FD->getPreviousDeclaration(); 6659 Prev; Prev = Prev->getPreviousDeclaration()) { 6660 // Ignore any declarations that occur in function or method 6661 // scope, because they aren't visible from the header. 6662 if (Prev->getDeclContext()->isFunctionOrMethod()) 6663 continue; 6664 6665 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 6666 break; 6667 } 6668 6669 return MissingPrototype; 6670} 6671 6672void Sema::CheckForFunctionRedefinition(FunctionDecl *FD) { 6673 // Don't complain if we're in GNU89 mode and the previous definition 6674 // was an extern inline function. 6675 const FunctionDecl *Definition; 6676 if (FD->isDefined(Definition) && 6677 !canRedefineFunction(Definition, getLangOptions())) { 6678 if (getLangOptions().GNUMode && Definition->isInlineSpecified() && 6679 Definition->getStorageClass() == SC_Extern) 6680 Diag(FD->getLocation(), diag::err_redefinition_extern_inline) 6681 << FD->getDeclName() << getLangOptions().CPlusPlus; 6682 else 6683 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 6684 Diag(Definition->getLocation(), diag::note_previous_definition); 6685 } 6686} 6687 6688Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Decl *D) { 6689 // Clear the last template instantiation error context. 6690 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation(); 6691 6692 if (!D) 6693 return D; 6694 FunctionDecl *FD = 0; 6695 6696 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(D)) 6697 FD = FunTmpl->getTemplatedDecl(); 6698 else 6699 FD = cast<FunctionDecl>(D); 6700 6701 // Enter a new function scope 6702 PushFunctionScope(); 6703 6704 // See if this is a redefinition. 6705 if (!FD->isLateTemplateParsed()) 6706 CheckForFunctionRedefinition(FD); 6707 6708 // Builtin functions cannot be defined. 6709 if (unsigned BuiltinID = FD->getBuiltinID()) { 6710 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 6711 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 6712 FD->setInvalidDecl(); 6713 } 6714 } 6715 6716 // The return type of a function definition must be complete 6717 // (C99 6.9.1p3, C++ [dcl.fct]p6). 6718 QualType ResultType = FD->getResultType(); 6719 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 6720 !FD->isInvalidDecl() && 6721 RequireCompleteType(FD->getLocation(), ResultType, 6722 diag::err_func_def_incomplete_result)) 6723 FD->setInvalidDecl(); 6724 6725 // GNU warning -Wmissing-prototypes: 6726 // Warn if a global function is defined without a previous 6727 // prototype declaration. This warning is issued even if the 6728 // definition itself provides a prototype. The aim is to detect 6729 // global functions that fail to be declared in header files. 6730 if (ShouldWarnAboutMissingPrototype(FD)) 6731 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 6732 6733 if (FnBodyScope) 6734 PushDeclContext(FnBodyScope, FD); 6735 6736 // Check the validity of our function parameters 6737 CheckParmsForFunctionDef(FD->param_begin(), FD->param_end(), 6738 /*CheckParameterNames=*/true); 6739 6740 // Introduce our parameters into the function scope 6741 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 6742 ParmVarDecl *Param = FD->getParamDecl(p); 6743 Param->setOwningFunction(FD); 6744 6745 // If this has an identifier, add it to the scope stack. 6746 if (Param->getIdentifier() && FnBodyScope) { 6747 CheckShadow(FnBodyScope, Param); 6748 6749 PushOnScopeChains(Param, FnBodyScope); 6750 } 6751 } 6752 6753 // Checking attributes of current function definition 6754 // dllimport attribute. 6755 DLLImportAttr *DA = FD->getAttr<DLLImportAttr>(); 6756 if (DA && (!FD->getAttr<DLLExportAttr>())) { 6757 // dllimport attribute cannot be directly applied to definition. 6758 // Microsoft accepts dllimport for functions defined within class scope. 6759 if (!DA->isInherited() && 6760 !(LangOpts.MicrosoftExt && FD->getLexicalDeclContext()->isRecord())) { 6761 Diag(FD->getLocation(), 6762 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 6763 << "dllimport"; 6764 FD->setInvalidDecl(); 6765 return FD; 6766 } 6767 6768 // Visual C++ appears to not think this is an issue, so only issue 6769 // a warning when Microsoft extensions are disabled. 6770 if (!LangOpts.MicrosoftExt) { 6771 // If a symbol previously declared dllimport is later defined, the 6772 // attribute is ignored in subsequent references, and a warning is 6773 // emitted. 6774 Diag(FD->getLocation(), 6775 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 6776 << FD->getName() << "dllimport"; 6777 } 6778 } 6779 return FD; 6780} 6781 6782/// \brief Given the set of return statements within a function body, 6783/// compute the variables that are subject to the named return value 6784/// optimization. 6785/// 6786/// Each of the variables that is subject to the named return value 6787/// optimization will be marked as NRVO variables in the AST, and any 6788/// return statement that has a marked NRVO variable as its NRVO candidate can 6789/// use the named return value optimization. 6790/// 6791/// This function applies a very simplistic algorithm for NRVO: if every return 6792/// statement in the function has the same NRVO candidate, that candidate is 6793/// the NRVO variable. 6794/// 6795/// FIXME: Employ a smarter algorithm that accounts for multiple return 6796/// statements and the lifetimes of the NRVO candidates. We should be able to 6797/// find a maximal set of NRVO variables. 6798void Sema::computeNRVO(Stmt *Body, FunctionScopeInfo *Scope) { 6799 ReturnStmt **Returns = Scope->Returns.data(); 6800 6801 const VarDecl *NRVOCandidate = 0; 6802 for (unsigned I = 0, E = Scope->Returns.size(); I != E; ++I) { 6803 if (!Returns[I]->getNRVOCandidate()) 6804 return; 6805 6806 if (!NRVOCandidate) 6807 NRVOCandidate = Returns[I]->getNRVOCandidate(); 6808 else if (NRVOCandidate != Returns[I]->getNRVOCandidate()) 6809 return; 6810 } 6811 6812 if (NRVOCandidate) 6813 const_cast<VarDecl*>(NRVOCandidate)->setNRVOVariable(true); 6814} 6815 6816Decl *Sema::ActOnFinishFunctionBody(Decl *D, Stmt *BodyArg) { 6817 return ActOnFinishFunctionBody(D, move(BodyArg), false); 6818} 6819 6820Decl *Sema::ActOnFinishFunctionBody(Decl *dcl, Stmt *Body, 6821 bool IsInstantiation) { 6822 FunctionDecl *FD = 0; 6823 FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl); 6824 if (FunTmpl) 6825 FD = FunTmpl->getTemplatedDecl(); 6826 else 6827 FD = dyn_cast_or_null<FunctionDecl>(dcl); 6828 6829 sema::AnalysisBasedWarnings::Policy WP = AnalysisWarnings.getDefaultPolicy(); 6830 sema::AnalysisBasedWarnings::Policy *ActivePolicy = 0; 6831 6832 if (FD) { 6833 FD->setBody(Body); 6834 if (FD->isMain()) { 6835 // C and C++ allow for main to automagically return 0. 6836 // Implements C++ [basic.start.main]p5 and C99 5.1.2.2.3. 6837 FD->setHasImplicitReturnZero(true); 6838 WP.disableCheckFallThrough(); 6839 } else if (FD->hasAttr<NakedAttr>()) { 6840 // If the function is marked 'naked', don't complain about missing return 6841 // statements. 6842 WP.disableCheckFallThrough(); 6843 } 6844 6845 // MSVC permits the use of pure specifier (=0) on function definition, 6846 // defined at class scope, warn about this non standard construct. 6847 if (getLangOptions().MicrosoftExt && FD->isPure()) 6848 Diag(FD->getLocation(), diag::warn_pure_function_definition); 6849 6850 if (!FD->isInvalidDecl()) { 6851 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end()); 6852 DiagnoseSizeOfParametersAndReturnValue(FD->param_begin(), FD->param_end(), 6853 FD->getResultType(), FD); 6854 6855 // If this is a constructor, we need a vtable. 6856 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(FD)) 6857 MarkVTableUsed(FD->getLocation(), Constructor->getParent()); 6858 6859 computeNRVO(Body, getCurFunction()); 6860 } 6861 6862 assert(FD == getCurFunctionDecl() && "Function parsing confused"); 6863 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 6864 assert(MD == getCurMethodDecl() && "Method parsing confused"); 6865 MD->setBody(Body); 6866 if (Body) 6867 MD->setEndLoc(Body->getLocEnd()); 6868 if (!MD->isInvalidDecl()) { 6869 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end()); 6870 DiagnoseSizeOfParametersAndReturnValue(MD->param_begin(), MD->param_end(), 6871 MD->getResultType(), MD); 6872 6873 if (Body) 6874 computeNRVO(Body, getCurFunction()); 6875 } 6876 if (ObjCShouldCallSuperDealloc) { 6877 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_dealloc); 6878 ObjCShouldCallSuperDealloc = false; 6879 } 6880 if (ObjCShouldCallSuperFinalize) { 6881 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_finalize); 6882 ObjCShouldCallSuperFinalize = false; 6883 } 6884 } else { 6885 return 0; 6886 } 6887 6888 assert(!ObjCShouldCallSuperDealloc && "This should only be set for " 6889 "ObjC methods, which should have been handled in the block above."); 6890 assert(!ObjCShouldCallSuperFinalize && "This should only be set for " 6891 "ObjC methods, which should have been handled in the block above."); 6892 6893 // Verify and clean out per-function state. 6894 if (Body) { 6895 // C++ constructors that have function-try-blocks can't have return 6896 // statements in the handlers of that block. (C++ [except.handle]p14) 6897 // Verify this. 6898 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body)) 6899 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); 6900 6901 // Verify that gotos and switch cases don't jump into scopes illegally. 6902 if (getCurFunction()->NeedsScopeChecking() && 6903 !dcl->isInvalidDecl() && 6904 !hasAnyUnrecoverableErrorsInThisFunction()) 6905 DiagnoseInvalidJumps(Body); 6906 6907 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) { 6908 if (!Destructor->getParent()->isDependentType()) 6909 CheckDestructor(Destructor); 6910 6911 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 6912 Destructor->getParent()); 6913 } 6914 6915 // If any errors have occurred, clear out any temporaries that may have 6916 // been leftover. This ensures that these temporaries won't be picked up for 6917 // deletion in some later function. 6918 if (PP.getDiagnostics().hasErrorOccurred() || 6919 PP.getDiagnostics().getSuppressAllDiagnostics()) { 6920 ExprTemporaries.clear(); 6921 ExprNeedsCleanups = false; 6922 } else if (!isa<FunctionTemplateDecl>(dcl)) { 6923 // Since the body is valid, issue any analysis-based warnings that are 6924 // enabled. 6925 ActivePolicy = &WP; 6926 } 6927 6928 assert(ExprTemporaries.empty() && "Leftover temporaries in function"); 6929 assert(!ExprNeedsCleanups && "Unaccounted cleanups in function"); 6930 } 6931 6932 if (!IsInstantiation) 6933 PopDeclContext(); 6934 6935 PopFunctionOrBlockScope(ActivePolicy, dcl); 6936 6937 // If any errors have occurred, clear out any temporaries that may have 6938 // been leftover. This ensures that these temporaries won't be picked up for 6939 // deletion in some later function. 6940 if (getDiagnostics().hasErrorOccurred()) { 6941 ExprTemporaries.clear(); 6942 ExprNeedsCleanups = false; 6943 } 6944 6945 return dcl; 6946} 6947 6948 6949/// When we finish delayed parsing of an attribute, we must attach it to the 6950/// relevant Decl. 6951void Sema::ActOnFinishDelayedAttribute(Scope *S, Decl *D, 6952 ParsedAttributes &Attrs) { 6953 ProcessDeclAttributeList(S, D, Attrs.getList()); 6954} 6955 6956 6957/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 6958/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 6959NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 6960 IdentifierInfo &II, Scope *S) { 6961 // Before we produce a declaration for an implicitly defined 6962 // function, see whether there was a locally-scoped declaration of 6963 // this name as a function or variable. If so, use that 6964 // (non-visible) declaration, and complain about it. 6965 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 6966 = findLocallyScopedExternalDecl(&II); 6967 if (Pos != LocallyScopedExternalDecls.end()) { 6968 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 6969 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 6970 return Pos->second; 6971 } 6972 6973 // Extension in C99. Legal in C90, but warn about it. 6974 if (II.getName().startswith("__builtin_")) 6975 Diag(Loc, diag::warn_builtin_unknown) << &II; 6976 else if (getLangOptions().C99) 6977 Diag(Loc, diag::ext_implicit_function_decl) << &II; 6978 else 6979 Diag(Loc, diag::warn_implicit_function_decl) << &II; 6980 6981 // Set a Declarator for the implicit definition: int foo(); 6982 const char *Dummy; 6983 AttributeFactory attrFactory; 6984 DeclSpec DS(attrFactory); 6985 unsigned DiagID; 6986 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID); 6987 (void)Error; // Silence warning. 6988 assert(!Error && "Error setting up implicit decl!"); 6989 Declarator D(DS, Declarator::BlockContext); 6990 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0, 6991 0, 0, true, SourceLocation(), 6992 SourceLocation(), 6993 EST_None, SourceLocation(), 6994 0, 0, 0, 0, Loc, Loc, D), 6995 DS.getAttributes(), 6996 SourceLocation()); 6997 D.SetIdentifier(&II, Loc); 6998 6999 // Insert this function into translation-unit scope. 7000 7001 DeclContext *PrevDC = CurContext; 7002 CurContext = Context.getTranslationUnitDecl(); 7003 7004 FunctionDecl *FD = dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D)); 7005 FD->setImplicit(); 7006 7007 CurContext = PrevDC; 7008 7009 AddKnownFunctionAttributes(FD); 7010 7011 return FD; 7012} 7013 7014/// \brief Adds any function attributes that we know a priori based on 7015/// the declaration of this function. 7016/// 7017/// These attributes can apply both to implicitly-declared builtins 7018/// (like __builtin___printf_chk) or to library-declared functions 7019/// like NSLog or printf. 7020/// 7021/// We need to check for duplicate attributes both here and where user-written 7022/// attributes are applied to declarations. 7023void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 7024 if (FD->isInvalidDecl()) 7025 return; 7026 7027 // If this is a built-in function, map its builtin attributes to 7028 // actual attributes. 7029 if (unsigned BuiltinID = FD->getBuiltinID()) { 7030 // Handle printf-formatting attributes. 7031 unsigned FormatIdx; 7032 bool HasVAListArg; 7033 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 7034 if (!FD->getAttr<FormatAttr>()) 7035 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7036 "printf", FormatIdx+1, 7037 HasVAListArg ? 0 : FormatIdx+2)); 7038 } 7039 if (Context.BuiltinInfo.isScanfLike(BuiltinID, FormatIdx, 7040 HasVAListArg)) { 7041 if (!FD->getAttr<FormatAttr>()) 7042 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7043 "scanf", FormatIdx+1, 7044 HasVAListArg ? 0 : FormatIdx+2)); 7045 } 7046 7047 // Mark const if we don't care about errno and that is the only 7048 // thing preventing the function from being const. This allows 7049 // IRgen to use LLVM intrinsics for such functions. 7050 if (!getLangOptions().MathErrno && 7051 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 7052 if (!FD->getAttr<ConstAttr>()) 7053 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 7054 } 7055 7056 if (Context.BuiltinInfo.isNoThrow(BuiltinID) && !FD->getAttr<NoThrowAttr>()) 7057 FD->addAttr(::new (Context) NoThrowAttr(FD->getLocation(), Context)); 7058 if (Context.BuiltinInfo.isConst(BuiltinID) && !FD->getAttr<ConstAttr>()) 7059 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 7060 } 7061 7062 IdentifierInfo *Name = FD->getIdentifier(); 7063 if (!Name) 7064 return; 7065 if ((!getLangOptions().CPlusPlus && 7066 FD->getDeclContext()->isTranslationUnit()) || 7067 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 7068 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 7069 LinkageSpecDecl::lang_c)) { 7070 // Okay: this could be a libc/libm/Objective-C function we know 7071 // about. 7072 } else 7073 return; 7074 7075 if (Name->isStr("NSLog") || Name->isStr("NSLogv")) { 7076 // FIXME: NSLog and NSLogv should be target specific 7077 if (const FormatAttr *Format = FD->getAttr<FormatAttr>()) { 7078 // FIXME: We known better than our headers. 7079 const_cast<FormatAttr *>(Format)->setType(Context, "printf"); 7080 } else 7081 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7082 "printf", 1, 7083 Name->isStr("NSLogv") ? 0 : 2)); 7084 } else if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { 7085 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be 7086 // target-specific builtins, perhaps? 7087 if (!FD->getAttr<FormatAttr>()) 7088 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7089 "printf", 2, 7090 Name->isStr("vasprintf") ? 0 : 3)); 7091 } 7092} 7093 7094TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 7095 TypeSourceInfo *TInfo) { 7096 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 7097 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 7098 7099 if (!TInfo) { 7100 assert(D.isInvalidType() && "no declarator info for valid type"); 7101 TInfo = Context.getTrivialTypeSourceInfo(T); 7102 } 7103 7104 // Scope manipulation handled by caller. 7105 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 7106 D.getSourceRange().getBegin(), 7107 D.getIdentifierLoc(), 7108 D.getIdentifier(), 7109 TInfo); 7110 7111 // Bail out immediately if we have an invalid declaration. 7112 if (D.isInvalidType()) { 7113 NewTD->setInvalidDecl(); 7114 return NewTD; 7115 } 7116 7117 if (D.getDeclSpec().isModulePrivateSpecified()) { 7118 if (CurContext->isFunctionOrMethod()) 7119 Diag(NewTD->getLocation(), diag::err_module_private_local) 7120 << 2 << NewTD->getDeclName() 7121 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 7122 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 7123 else 7124 NewTD->setModulePrivate(); 7125 } 7126 7127 // C++ [dcl.typedef]p8: 7128 // If the typedef declaration defines an unnamed class (or 7129 // enum), the first typedef-name declared by the declaration 7130 // to be that class type (or enum type) is used to denote the 7131 // class type (or enum type) for linkage purposes only. 7132 // We need to check whether the type was declared in the declaration. 7133 switch (D.getDeclSpec().getTypeSpecType()) { 7134 case TST_enum: 7135 case TST_struct: 7136 case TST_union: 7137 case TST_class: { 7138 TagDecl *tagFromDeclSpec = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 7139 7140 // Do nothing if the tag is not anonymous or already has an 7141 // associated typedef (from an earlier typedef in this decl group). 7142 if (tagFromDeclSpec->getIdentifier()) break; 7143 if (tagFromDeclSpec->getTypedefNameForAnonDecl()) break; 7144 7145 // A well-formed anonymous tag must always be a TUK_Definition. 7146 assert(tagFromDeclSpec->isThisDeclarationADefinition()); 7147 7148 // The type must match the tag exactly; no qualifiers allowed. 7149 if (!Context.hasSameType(T, Context.getTagDeclType(tagFromDeclSpec))) 7150 break; 7151 7152 // Otherwise, set this is the anon-decl typedef for the tag. 7153 tagFromDeclSpec->setTypedefNameForAnonDecl(NewTD); 7154 break; 7155 } 7156 7157 default: 7158 break; 7159 } 7160 7161 return NewTD; 7162} 7163 7164 7165/// \brief Determine whether a tag with a given kind is acceptable 7166/// as a redeclaration of the given tag declaration. 7167/// 7168/// \returns true if the new tag kind is acceptable, false otherwise. 7169bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, 7170 TagTypeKind NewTag, bool isDefinition, 7171 SourceLocation NewTagLoc, 7172 const IdentifierInfo &Name) { 7173 // C++ [dcl.type.elab]p3: 7174 // The class-key or enum keyword present in the 7175 // elaborated-type-specifier shall agree in kind with the 7176 // declaration to which the name in the elaborated-type-specifier 7177 // refers. This rule also applies to the form of 7178 // elaborated-type-specifier that declares a class-name or 7179 // friend class since it can be construed as referring to the 7180 // definition of the class. Thus, in any 7181 // elaborated-type-specifier, the enum keyword shall be used to 7182 // refer to an enumeration (7.2), the union class-key shall be 7183 // used to refer to a union (clause 9), and either the class or 7184 // struct class-key shall be used to refer to a class (clause 9) 7185 // declared using the class or struct class-key. 7186 TagTypeKind OldTag = Previous->getTagKind(); 7187 if (!isDefinition || (NewTag != TTK_Class && NewTag != TTK_Struct)) 7188 if (OldTag == NewTag) 7189 return true; 7190 7191 if ((OldTag == TTK_Struct || OldTag == TTK_Class) && 7192 (NewTag == TTK_Struct || NewTag == TTK_Class)) { 7193 // Warn about the struct/class tag mismatch. 7194 bool isTemplate = false; 7195 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) 7196 isTemplate = Record->getDescribedClassTemplate(); 7197 7198 if (!ActiveTemplateInstantiations.empty()) { 7199 // In a template instantiation, do not offer fix-its for tag mismatches 7200 // since they usually mess up the template instead of fixing the problem. 7201 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 7202 << (NewTag == TTK_Class) << isTemplate << &Name; 7203 return true; 7204 } 7205 7206 if (isDefinition) { 7207 // On definitions, check previous tags and issue a fix-it for each 7208 // one that doesn't match the current tag. 7209 if (Previous->getDefinition()) { 7210 // Don't suggest fix-its for redefinitions. 7211 return true; 7212 } 7213 7214 bool previousMismatch = false; 7215 for (TagDecl::redecl_iterator I(Previous->redecls_begin()), 7216 E(Previous->redecls_end()); I != E; ++I) { 7217 if (I->getTagKind() != NewTag) { 7218 if (!previousMismatch) { 7219 previousMismatch = true; 7220 Diag(NewTagLoc, diag::warn_struct_class_previous_tag_mismatch) 7221 << (NewTag == TTK_Class) << isTemplate << &Name; 7222 } 7223 Diag(I->getInnerLocStart(), diag::note_struct_class_suggestion) 7224 << (NewTag == TTK_Class) 7225 << FixItHint::CreateReplacement(I->getInnerLocStart(), 7226 NewTag == TTK_Class? 7227 "class" : "struct"); 7228 } 7229 } 7230 return true; 7231 } 7232 7233 // Check for a previous definition. If current tag and definition 7234 // are same type, do nothing. If no definition, but disagree with 7235 // with previous tag type, give a warning, but no fix-it. 7236 const TagDecl *Redecl = Previous->getDefinition() ? 7237 Previous->getDefinition() : Previous; 7238 if (Redecl->getTagKind() == NewTag) { 7239 return true; 7240 } 7241 7242 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 7243 << (NewTag == TTK_Class) 7244 << isTemplate << &Name; 7245 Diag(Redecl->getLocation(), diag::note_previous_use); 7246 7247 // If there is a previous defintion, suggest a fix-it. 7248 if (Previous->getDefinition()) { 7249 Diag(NewTagLoc, diag::note_struct_class_suggestion) 7250 << (Redecl->getTagKind() == TTK_Class) 7251 << FixItHint::CreateReplacement(SourceRange(NewTagLoc), 7252 Redecl->getTagKind() == TTK_Class? "class" : "struct"); 7253 } 7254 7255 return true; 7256 } 7257 return false; 7258} 7259 7260/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 7261/// former case, Name will be non-null. In the later case, Name will be null. 7262/// TagSpec indicates what kind of tag this is. TUK indicates whether this is a 7263/// reference/declaration/definition of a tag. 7264Decl *Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK, 7265 SourceLocation KWLoc, CXXScopeSpec &SS, 7266 IdentifierInfo *Name, SourceLocation NameLoc, 7267 AttributeList *Attr, AccessSpecifier AS, 7268 SourceLocation ModulePrivateLoc, 7269 MultiTemplateParamsArg TemplateParameterLists, 7270 bool &OwnedDecl, bool &IsDependent, 7271 bool ScopedEnum, bool ScopedEnumUsesClassTag, 7272 TypeResult UnderlyingType) { 7273 // If this is not a definition, it must have a name. 7274 assert((Name != 0 || TUK == TUK_Definition) && 7275 "Nameless record must be a definition!"); 7276 assert(TemplateParameterLists.size() == 0 || TUK != TUK_Reference); 7277 7278 OwnedDecl = false; 7279 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 7280 7281 // FIXME: Check explicit specializations more carefully. 7282 bool isExplicitSpecialization = false; 7283 bool Invalid = false; 7284 7285 // We only need to do this matching if we have template parameters 7286 // or a scope specifier, which also conveniently avoids this work 7287 // for non-C++ cases. 7288 if (TemplateParameterLists.size() > 0 || 7289 (SS.isNotEmpty() && TUK != TUK_Reference)) { 7290 if (TemplateParameterList *TemplateParams 7291 = MatchTemplateParametersToScopeSpecifier(KWLoc, NameLoc, SS, 7292 TemplateParameterLists.get(), 7293 TemplateParameterLists.size(), 7294 TUK == TUK_Friend, 7295 isExplicitSpecialization, 7296 Invalid)) { 7297 if (TemplateParams->size() > 0) { 7298 // This is a declaration or definition of a class template (which may 7299 // be a member of another template). 7300 7301 if (Invalid) 7302 return 0; 7303 7304 OwnedDecl = false; 7305 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc, 7306 SS, Name, NameLoc, Attr, 7307 TemplateParams, AS, 7308 ModulePrivateLoc, 7309 TemplateParameterLists.size() - 1, 7310 (TemplateParameterList**) TemplateParameterLists.release()); 7311 return Result.get(); 7312 } else { 7313 // The "template<>" header is extraneous. 7314 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 7315 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 7316 isExplicitSpecialization = true; 7317 } 7318 } 7319 } 7320 7321 // Figure out the underlying type if this a enum declaration. We need to do 7322 // this early, because it's needed to detect if this is an incompatible 7323 // redeclaration. 7324 llvm::PointerUnion<const Type*, TypeSourceInfo*> EnumUnderlying; 7325 7326 if (Kind == TTK_Enum) { 7327 if (UnderlyingType.isInvalid() || (!UnderlyingType.get() && ScopedEnum)) 7328 // No underlying type explicitly specified, or we failed to parse the 7329 // type, default to int. 7330 EnumUnderlying = Context.IntTy.getTypePtr(); 7331 else if (UnderlyingType.get()) { 7332 // C++0x 7.2p2: The type-specifier-seq of an enum-base shall name an 7333 // integral type; any cv-qualification is ignored. 7334 TypeSourceInfo *TI = 0; 7335 QualType T = GetTypeFromParser(UnderlyingType.get(), &TI); 7336 EnumUnderlying = TI; 7337 7338 SourceLocation UnderlyingLoc = TI->getTypeLoc().getBeginLoc(); 7339 7340 if (!T->isDependentType() && !T->isIntegralType(Context)) { 7341 Diag(UnderlyingLoc, diag::err_enum_invalid_underlying) 7342 << T; 7343 // Recover by falling back to int. 7344 EnumUnderlying = Context.IntTy.getTypePtr(); 7345 } 7346 7347 if (DiagnoseUnexpandedParameterPack(UnderlyingLoc, TI, 7348 UPPC_FixedUnderlyingType)) 7349 EnumUnderlying = Context.IntTy.getTypePtr(); 7350 7351 } else if (getLangOptions().MicrosoftExt) 7352 // Microsoft enums are always of int type. 7353 EnumUnderlying = Context.IntTy.getTypePtr(); 7354 } 7355 7356 DeclContext *SearchDC = CurContext; 7357 DeclContext *DC = CurContext; 7358 bool isStdBadAlloc = false; 7359 7360 RedeclarationKind Redecl = ForRedeclaration; 7361 if (TUK == TUK_Friend || TUK == TUK_Reference) 7362 Redecl = NotForRedeclaration; 7363 7364 LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl); 7365 7366 if (Name && SS.isNotEmpty()) { 7367 // We have a nested-name tag ('struct foo::bar'). 7368 7369 // Check for invalid 'foo::'. 7370 if (SS.isInvalid()) { 7371 Name = 0; 7372 goto CreateNewDecl; 7373 } 7374 7375 // If this is a friend or a reference to a class in a dependent 7376 // context, don't try to make a decl for it. 7377 if (TUK == TUK_Friend || TUK == TUK_Reference) { 7378 DC = computeDeclContext(SS, false); 7379 if (!DC) { 7380 IsDependent = true; 7381 return 0; 7382 } 7383 } else { 7384 DC = computeDeclContext(SS, true); 7385 if (!DC) { 7386 Diag(SS.getRange().getBegin(), diag::err_dependent_nested_name_spec) 7387 << SS.getRange(); 7388 return 0; 7389 } 7390 } 7391 7392 if (RequireCompleteDeclContext(SS, DC)) 7393 return 0; 7394 7395 SearchDC = DC; 7396 // Look-up name inside 'foo::'. 7397 LookupQualifiedName(Previous, DC); 7398 7399 if (Previous.isAmbiguous()) 7400 return 0; 7401 7402 if (Previous.empty()) { 7403 // Name lookup did not find anything. However, if the 7404 // nested-name-specifier refers to the current instantiation, 7405 // and that current instantiation has any dependent base 7406 // classes, we might find something at instantiation time: treat 7407 // this as a dependent elaborated-type-specifier. 7408 // But this only makes any sense for reference-like lookups. 7409 if (Previous.wasNotFoundInCurrentInstantiation() && 7410 (TUK == TUK_Reference || TUK == TUK_Friend)) { 7411 IsDependent = true; 7412 return 0; 7413 } 7414 7415 // A tag 'foo::bar' must already exist. 7416 Diag(NameLoc, diag::err_not_tag_in_scope) 7417 << Kind << Name << DC << SS.getRange(); 7418 Name = 0; 7419 Invalid = true; 7420 goto CreateNewDecl; 7421 } 7422 } else if (Name) { 7423 // If this is a named struct, check to see if there was a previous forward 7424 // declaration or definition. 7425 // FIXME: We're looking into outer scopes here, even when we 7426 // shouldn't be. Doing so can result in ambiguities that we 7427 // shouldn't be diagnosing. 7428 LookupName(Previous, S); 7429 7430 if (Previous.isAmbiguous() && 7431 (TUK == TUK_Definition || TUK == TUK_Declaration)) { 7432 LookupResult::Filter F = Previous.makeFilter(); 7433 while (F.hasNext()) { 7434 NamedDecl *ND = F.next(); 7435 if (ND->getDeclContext()->getRedeclContext() != SearchDC) 7436 F.erase(); 7437 } 7438 F.done(); 7439 } 7440 7441 // Note: there used to be some attempt at recovery here. 7442 if (Previous.isAmbiguous()) 7443 return 0; 7444 7445 if (!getLangOptions().CPlusPlus && TUK != TUK_Reference) { 7446 // FIXME: This makes sure that we ignore the contexts associated 7447 // with C structs, unions, and enums when looking for a matching 7448 // tag declaration or definition. See the similar lookup tweak 7449 // in Sema::LookupName; is there a better way to deal with this? 7450 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 7451 SearchDC = SearchDC->getParent(); 7452 } 7453 } else if (S->isFunctionPrototypeScope()) { 7454 // If this is an enum declaration in function prototype scope, set its 7455 // initial context to the translation unit. 7456 SearchDC = Context.getTranslationUnitDecl(); 7457 } 7458 7459 if (Previous.isSingleResult() && 7460 Previous.getFoundDecl()->isTemplateParameter()) { 7461 // Maybe we will complain about the shadowed template parameter. 7462 DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl()); 7463 // Just pretend that we didn't see the previous declaration. 7464 Previous.clear(); 7465 } 7466 7467 if (getLangOptions().CPlusPlus && Name && DC && StdNamespace && 7468 DC->Equals(getStdNamespace()) && Name->isStr("bad_alloc")) { 7469 // This is a declaration of or a reference to "std::bad_alloc". 7470 isStdBadAlloc = true; 7471 7472 if (Previous.empty() && StdBadAlloc) { 7473 // std::bad_alloc has been implicitly declared (but made invisible to 7474 // name lookup). Fill in this implicit declaration as the previous 7475 // declaration, so that the declarations get chained appropriately. 7476 Previous.addDecl(getStdBadAlloc()); 7477 } 7478 } 7479 7480 // If we didn't find a previous declaration, and this is a reference 7481 // (or friend reference), move to the correct scope. In C++, we 7482 // also need to do a redeclaration lookup there, just in case 7483 // there's a shadow friend decl. 7484 if (Name && Previous.empty() && 7485 (TUK == TUK_Reference || TUK == TUK_Friend)) { 7486 if (Invalid) goto CreateNewDecl; 7487 assert(SS.isEmpty()); 7488 7489 if (TUK == TUK_Reference) { 7490 // C++ [basic.scope.pdecl]p5: 7491 // -- for an elaborated-type-specifier of the form 7492 // 7493 // class-key identifier 7494 // 7495 // if the elaborated-type-specifier is used in the 7496 // decl-specifier-seq or parameter-declaration-clause of a 7497 // function defined in namespace scope, the identifier is 7498 // declared as a class-name in the namespace that contains 7499 // the declaration; otherwise, except as a friend 7500 // declaration, the identifier is declared in the smallest 7501 // non-class, non-function-prototype scope that contains the 7502 // declaration. 7503 // 7504 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 7505 // C structs and unions. 7506 // 7507 // It is an error in C++ to declare (rather than define) an enum 7508 // type, including via an elaborated type specifier. We'll 7509 // diagnose that later; for now, declare the enum in the same 7510 // scope as we would have picked for any other tag type. 7511 // 7512 // GNU C also supports this behavior as part of its incomplete 7513 // enum types extension, while GNU C++ does not. 7514 // 7515 // Find the context where we'll be declaring the tag. 7516 // FIXME: We would like to maintain the current DeclContext as the 7517 // lexical context, 7518 while (SearchDC->isRecord() || SearchDC->isTransparentContext()) 7519 SearchDC = SearchDC->getParent(); 7520 7521 // Find the scope where we'll be declaring the tag. 7522 while (S->isClassScope() || 7523 (getLangOptions().CPlusPlus && 7524 S->isFunctionPrototypeScope()) || 7525 ((S->getFlags() & Scope::DeclScope) == 0) || 7526 (S->getEntity() && 7527 ((DeclContext *)S->getEntity())->isTransparentContext())) 7528 S = S->getParent(); 7529 } else { 7530 assert(TUK == TUK_Friend); 7531 // C++ [namespace.memdef]p3: 7532 // If a friend declaration in a non-local class first declares a 7533 // class or function, the friend class or function is a member of 7534 // the innermost enclosing namespace. 7535 SearchDC = SearchDC->getEnclosingNamespaceContext(); 7536 } 7537 7538 // In C++, we need to do a redeclaration lookup to properly 7539 // diagnose some problems. 7540 if (getLangOptions().CPlusPlus) { 7541 Previous.setRedeclarationKind(ForRedeclaration); 7542 LookupQualifiedName(Previous, SearchDC); 7543 } 7544 } 7545 7546 if (!Previous.empty()) { 7547 NamedDecl *PrevDecl = (*Previous.begin())->getUnderlyingDecl(); 7548 7549 // It's okay to have a tag decl in the same scope as a typedef 7550 // which hides a tag decl in the same scope. Finding this 7551 // insanity with a redeclaration lookup can only actually happen 7552 // in C++. 7553 // 7554 // This is also okay for elaborated-type-specifiers, which is 7555 // technically forbidden by the current standard but which is 7556 // okay according to the likely resolution of an open issue; 7557 // see http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#407 7558 if (getLangOptions().CPlusPlus) { 7559 if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(PrevDecl)) { 7560 if (const TagType *TT = TD->getUnderlyingType()->getAs<TagType>()) { 7561 TagDecl *Tag = TT->getDecl(); 7562 if (Tag->getDeclName() == Name && 7563 Tag->getDeclContext()->getRedeclContext() 7564 ->Equals(TD->getDeclContext()->getRedeclContext())) { 7565 PrevDecl = Tag; 7566 Previous.clear(); 7567 Previous.addDecl(Tag); 7568 Previous.resolveKind(); 7569 } 7570 } 7571 } 7572 } 7573 7574 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 7575 // If this is a use of a previous tag, or if the tag is already declared 7576 // in the same scope (so that the definition/declaration completes or 7577 // rementions the tag), reuse the decl. 7578 if (TUK == TUK_Reference || TUK == TUK_Friend || 7579 isDeclInScope(PrevDecl, SearchDC, S, isExplicitSpecialization)) { 7580 // Make sure that this wasn't declared as an enum and now used as a 7581 // struct or something similar. 7582 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, 7583 TUK == TUK_Definition, KWLoc, 7584 *Name)) { 7585 bool SafeToContinue 7586 = (PrevTagDecl->getTagKind() != TTK_Enum && 7587 Kind != TTK_Enum); 7588 if (SafeToContinue) 7589 Diag(KWLoc, diag::err_use_with_wrong_tag) 7590 << Name 7591 << FixItHint::CreateReplacement(SourceRange(KWLoc), 7592 PrevTagDecl->getKindName()); 7593 else 7594 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 7595 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7596 7597 if (SafeToContinue) 7598 Kind = PrevTagDecl->getTagKind(); 7599 else { 7600 // Recover by making this an anonymous redefinition. 7601 Name = 0; 7602 Previous.clear(); 7603 Invalid = true; 7604 } 7605 } 7606 7607 if (Kind == TTK_Enum && PrevTagDecl->getTagKind() == TTK_Enum) { 7608 const EnumDecl *PrevEnum = cast<EnumDecl>(PrevTagDecl); 7609 7610 // All conflicts with previous declarations are recovered by 7611 // returning the previous declaration. 7612 if (ScopedEnum != PrevEnum->isScoped()) { 7613 Diag(KWLoc, diag::err_enum_redeclare_scoped_mismatch) 7614 << PrevEnum->isScoped(); 7615 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7616 return PrevTagDecl; 7617 } 7618 else if (EnumUnderlying && PrevEnum->isFixed()) { 7619 QualType T; 7620 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 7621 T = TI->getType(); 7622 else 7623 T = QualType(EnumUnderlying.get<const Type*>(), 0); 7624 7625 if (!Context.hasSameUnqualifiedType(T, PrevEnum->getIntegerType())) { 7626 Diag(NameLoc.isValid() ? NameLoc : KWLoc, 7627 diag::err_enum_redeclare_type_mismatch) 7628 << T 7629 << PrevEnum->getIntegerType(); 7630 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7631 return PrevTagDecl; 7632 } 7633 } 7634 else if (!EnumUnderlying.isNull() != PrevEnum->isFixed()) { 7635 Diag(KWLoc, diag::err_enum_redeclare_fixed_mismatch) 7636 << PrevEnum->isFixed(); 7637 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7638 return PrevTagDecl; 7639 } 7640 } 7641 7642 if (!Invalid) { 7643 // If this is a use, just return the declaration we found. 7644 7645 // FIXME: In the future, return a variant or some other clue 7646 // for the consumer of this Decl to know it doesn't own it. 7647 // For our current ASTs this shouldn't be a problem, but will 7648 // need to be changed with DeclGroups. 7649 if ((TUK == TUK_Reference && (!PrevTagDecl->getFriendObjectKind() || 7650 getLangOptions().MicrosoftExt)) || TUK == TUK_Friend) 7651 return PrevTagDecl; 7652 7653 // Diagnose attempts to redefine a tag. 7654 if (TUK == TUK_Definition) { 7655 if (TagDecl *Def = PrevTagDecl->getDefinition()) { 7656 // If we're defining a specialization and the previous definition 7657 // is from an implicit instantiation, don't emit an error 7658 // here; we'll catch this in the general case below. 7659 if (!isExplicitSpecialization || 7660 !isa<CXXRecordDecl>(Def) || 7661 cast<CXXRecordDecl>(Def)->getTemplateSpecializationKind() 7662 == TSK_ExplicitSpecialization) { 7663 Diag(NameLoc, diag::err_redefinition) << Name; 7664 Diag(Def->getLocation(), diag::note_previous_definition); 7665 // If this is a redefinition, recover by making this 7666 // struct be anonymous, which will make any later 7667 // references get the previous definition. 7668 Name = 0; 7669 Previous.clear(); 7670 Invalid = true; 7671 } 7672 } else { 7673 // If the type is currently being defined, complain 7674 // about a nested redefinition. 7675 const TagType *Tag 7676 = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 7677 if (Tag->isBeingDefined()) { 7678 Diag(NameLoc, diag::err_nested_redefinition) << Name; 7679 Diag(PrevTagDecl->getLocation(), 7680 diag::note_previous_definition); 7681 Name = 0; 7682 Previous.clear(); 7683 Invalid = true; 7684 } 7685 } 7686 7687 // Okay, this is definition of a previously declared or referenced 7688 // tag PrevDecl. We're going to create a new Decl for it. 7689 } 7690 } 7691 // If we get here we have (another) forward declaration or we 7692 // have a definition. Just create a new decl. 7693 7694 } else { 7695 // If we get here, this is a definition of a new tag type in a nested 7696 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 7697 // new decl/type. We set PrevDecl to NULL so that the entities 7698 // have distinct types. 7699 Previous.clear(); 7700 } 7701 // If we get here, we're going to create a new Decl. If PrevDecl 7702 // is non-NULL, it's a definition of the tag declared by 7703 // PrevDecl. If it's NULL, we have a new definition. 7704 7705 7706 // Otherwise, PrevDecl is not a tag, but was found with tag 7707 // lookup. This is only actually possible in C++, where a few 7708 // things like templates still live in the tag namespace. 7709 } else { 7710 assert(getLangOptions().CPlusPlus); 7711 7712 // Use a better diagnostic if an elaborated-type-specifier 7713 // found the wrong kind of type on the first 7714 // (non-redeclaration) lookup. 7715 if ((TUK == TUK_Reference || TUK == TUK_Friend) && 7716 !Previous.isForRedeclaration()) { 7717 unsigned Kind = 0; 7718 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 7719 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 7720 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 7721 Diag(NameLoc, diag::err_tag_reference_non_tag) << Kind; 7722 Diag(PrevDecl->getLocation(), diag::note_declared_at); 7723 Invalid = true; 7724 7725 // Otherwise, only diagnose if the declaration is in scope. 7726 } else if (!isDeclInScope(PrevDecl, SearchDC, S, 7727 isExplicitSpecialization)) { 7728 // do nothing 7729 7730 // Diagnose implicit declarations introduced by elaborated types. 7731 } else if (TUK == TUK_Reference || TUK == TUK_Friend) { 7732 unsigned Kind = 0; 7733 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 7734 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 7735 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 7736 Diag(NameLoc, diag::err_tag_reference_conflict) << Kind; 7737 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 7738 Invalid = true; 7739 7740 // Otherwise it's a declaration. Call out a particularly common 7741 // case here. 7742 } else if (TypedefNameDecl *TND = dyn_cast<TypedefNameDecl>(PrevDecl)) { 7743 unsigned Kind = 0; 7744 if (isa<TypeAliasDecl>(PrevDecl)) Kind = 1; 7745 Diag(NameLoc, diag::err_tag_definition_of_typedef) 7746 << Name << Kind << TND->getUnderlyingType(); 7747 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 7748 Invalid = true; 7749 7750 // Otherwise, diagnose. 7751 } else { 7752 // The tag name clashes with something else in the target scope, 7753 // issue an error and recover by making this tag be anonymous. 7754 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 7755 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 7756 Name = 0; 7757 Invalid = true; 7758 } 7759 7760 // The existing declaration isn't relevant to us; we're in a 7761 // new scope, so clear out the previous declaration. 7762 Previous.clear(); 7763 } 7764 } 7765 7766CreateNewDecl: 7767 7768 TagDecl *PrevDecl = 0; 7769 if (Previous.isSingleResult()) 7770 PrevDecl = cast<TagDecl>(Previous.getFoundDecl()); 7771 7772 // If there is an identifier, use the location of the identifier as the 7773 // location of the decl, otherwise use the location of the struct/union 7774 // keyword. 7775 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 7776 7777 // Otherwise, create a new declaration. If there is a previous 7778 // declaration of the same entity, the two will be linked via 7779 // PrevDecl. 7780 TagDecl *New; 7781 7782 bool IsForwardReference = false; 7783 if (Kind == TTK_Enum) { 7784 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 7785 // enum X { A, B, C } D; D should chain to X. 7786 New = EnumDecl::Create(Context, SearchDC, KWLoc, Loc, Name, 7787 cast_or_null<EnumDecl>(PrevDecl), ScopedEnum, 7788 ScopedEnumUsesClassTag, !EnumUnderlying.isNull()); 7789 // If this is an undefined enum, warn. 7790 if (TUK != TUK_Definition && !Invalid) { 7791 TagDecl *Def; 7792 if (getLangOptions().CPlusPlus0x && cast<EnumDecl>(New)->isFixed()) { 7793 // C++0x: 7.2p2: opaque-enum-declaration. 7794 // Conflicts are diagnosed above. Do nothing. 7795 } 7796 else if (PrevDecl && (Def = cast<EnumDecl>(PrevDecl)->getDefinition())) { 7797 Diag(Loc, diag::ext_forward_ref_enum_def) 7798 << New; 7799 Diag(Def->getLocation(), diag::note_previous_definition); 7800 } else { 7801 unsigned DiagID = diag::ext_forward_ref_enum; 7802 if (getLangOptions().MicrosoftExt) 7803 DiagID = diag::ext_ms_forward_ref_enum; 7804 else if (getLangOptions().CPlusPlus) 7805 DiagID = diag::err_forward_ref_enum; 7806 Diag(Loc, DiagID); 7807 7808 // If this is a forward-declared reference to an enumeration, make a 7809 // note of it; we won't actually be introducing the declaration into 7810 // the declaration context. 7811 if (TUK == TUK_Reference) 7812 IsForwardReference = true; 7813 } 7814 } 7815 7816 if (EnumUnderlying) { 7817 EnumDecl *ED = cast<EnumDecl>(New); 7818 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 7819 ED->setIntegerTypeSourceInfo(TI); 7820 else 7821 ED->setIntegerType(QualType(EnumUnderlying.get<const Type*>(), 0)); 7822 ED->setPromotionType(ED->getIntegerType()); 7823 } 7824 7825 } else { 7826 // struct/union/class 7827 7828 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 7829 // struct X { int A; } D; D should chain to X. 7830 if (getLangOptions().CPlusPlus) { 7831 // FIXME: Look for a way to use RecordDecl for simple structs. 7832 New = CXXRecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 7833 cast_or_null<CXXRecordDecl>(PrevDecl)); 7834 7835 if (isStdBadAlloc && (!StdBadAlloc || getStdBadAlloc()->isImplicit())) 7836 StdBadAlloc = cast<CXXRecordDecl>(New); 7837 } else 7838 New = RecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 7839 cast_or_null<RecordDecl>(PrevDecl)); 7840 } 7841 7842 // Maybe add qualifier info. 7843 if (SS.isNotEmpty()) { 7844 if (SS.isSet()) { 7845 New->setQualifierInfo(SS.getWithLocInContext(Context)); 7846 if (TemplateParameterLists.size() > 0) { 7847 New->setTemplateParameterListsInfo(Context, 7848 TemplateParameterLists.size(), 7849 (TemplateParameterList**) TemplateParameterLists.release()); 7850 } 7851 } 7852 else 7853 Invalid = true; 7854 } 7855 7856 if (RecordDecl *RD = dyn_cast<RecordDecl>(New)) { 7857 // Add alignment attributes if necessary; these attributes are checked when 7858 // the ASTContext lays out the structure. 7859 // 7860 // It is important for implementing the correct semantics that this 7861 // happen here (in act on tag decl). The #pragma pack stack is 7862 // maintained as a result of parser callbacks which can occur at 7863 // many points during the parsing of a struct declaration (because 7864 // the #pragma tokens are effectively skipped over during the 7865 // parsing of the struct). 7866 AddAlignmentAttributesForRecord(RD); 7867 7868 AddMsStructLayoutForRecord(RD); 7869 } 7870 7871 if (PrevDecl && PrevDecl->isModulePrivate()) 7872 New->setModulePrivate(); 7873 else if (ModulePrivateLoc.isValid()) { 7874 if (isExplicitSpecialization) 7875 Diag(New->getLocation(), diag::err_module_private_specialization) 7876 << 2 7877 << FixItHint::CreateRemoval(ModulePrivateLoc); 7878 else if (PrevDecl && !PrevDecl->isModulePrivate()) 7879 diagnoseModulePrivateRedeclaration(New, PrevDecl, ModulePrivateLoc); 7880 // __module_private__ does not apply to local classes. However, we only 7881 // diagnose this as an error when the declaration specifiers are 7882 // freestanding. Here, we just ignore the __module_private__. 7883 // foobar 7884 else if (!SearchDC->isFunctionOrMethod()) 7885 New->setModulePrivate(); 7886 } 7887 7888 // If this is a specialization of a member class (of a class template), 7889 // check the specialization. 7890 if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous)) 7891 Invalid = true; 7892 7893 if (Invalid) 7894 New->setInvalidDecl(); 7895 7896 if (Attr) 7897 ProcessDeclAttributeList(S, New, Attr); 7898 7899 // If we're declaring or defining a tag in function prototype scope 7900 // in C, note that this type can only be used within the function. 7901 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 7902 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 7903 7904 // Set the lexical context. If the tag has a C++ scope specifier, the 7905 // lexical context will be different from the semantic context. 7906 New->setLexicalDeclContext(CurContext); 7907 7908 // Mark this as a friend decl if applicable. 7909 // In Microsoft mode, a friend declaration also acts as a forward 7910 // declaration so we always pass true to setObjectOfFriendDecl to make 7911 // the tag name visible. 7912 if (TUK == TUK_Friend) 7913 New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ !Previous.empty() || 7914 getLangOptions().MicrosoftExt); 7915 7916 // Set the access specifier. 7917 if (!Invalid && SearchDC->isRecord()) 7918 SetMemberAccessSpecifier(New, PrevDecl, AS); 7919 7920 if (TUK == TUK_Definition) 7921 New->startDefinition(); 7922 7923 // If this has an identifier, add it to the scope stack. 7924 if (TUK == TUK_Friend) { 7925 // We might be replacing an existing declaration in the lookup tables; 7926 // if so, borrow its access specifier. 7927 if (PrevDecl) 7928 New->setAccess(PrevDecl->getAccess()); 7929 7930 DeclContext *DC = New->getDeclContext()->getRedeclContext(); 7931 DC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 7932 if (Name) // can be null along some error paths 7933 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 7934 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false); 7935 } else if (Name) { 7936 S = getNonFieldDeclScope(S); 7937 PushOnScopeChains(New, S, !IsForwardReference); 7938 if (IsForwardReference) 7939 SearchDC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 7940 7941 } else { 7942 CurContext->addDecl(New); 7943 } 7944 7945 // If this is the C FILE type, notify the AST context. 7946 if (IdentifierInfo *II = New->getIdentifier()) 7947 if (!New->isInvalidDecl() && 7948 New->getDeclContext()->getRedeclContext()->isTranslationUnit() && 7949 II->isStr("FILE")) 7950 Context.setFILEDecl(New); 7951 7952 OwnedDecl = true; 7953 return New; 7954} 7955 7956void Sema::ActOnTagStartDefinition(Scope *S, Decl *TagD) { 7957 AdjustDeclIfTemplate(TagD); 7958 TagDecl *Tag = cast<TagDecl>(TagD); 7959 7960 // Enter the tag context. 7961 PushDeclContext(S, Tag); 7962} 7963 7964void Sema::ActOnObjCContainerStartDefinition(Decl *IDecl) { 7965 assert(isa<ObjCContainerDecl>(IDecl) && 7966 "ActOnObjCContainerStartDefinition - Not ObjCContainerDecl"); 7967 DeclContext *OCD = cast<DeclContext>(IDecl); 7968 assert(getContainingDC(OCD) == CurContext && 7969 "The next DeclContext should be lexically contained in the current one."); 7970 CurContext = OCD; 7971} 7972 7973void Sema::ActOnStartCXXMemberDeclarations(Scope *S, Decl *TagD, 7974 SourceLocation FinalLoc, 7975 SourceLocation LBraceLoc) { 7976 AdjustDeclIfTemplate(TagD); 7977 CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD); 7978 7979 FieldCollector->StartClass(); 7980 7981 if (!Record->getIdentifier()) 7982 return; 7983 7984 if (FinalLoc.isValid()) 7985 Record->addAttr(new (Context) FinalAttr(FinalLoc, Context)); 7986 7987 // C++ [class]p2: 7988 // [...] The class-name is also inserted into the scope of the 7989 // class itself; this is known as the injected-class-name. For 7990 // purposes of access checking, the injected-class-name is treated 7991 // as if it were a public member name. 7992 CXXRecordDecl *InjectedClassName 7993 = CXXRecordDecl::Create(Context, Record->getTagKind(), CurContext, 7994 Record->getLocStart(), Record->getLocation(), 7995 Record->getIdentifier(), 7996 /*PrevDecl=*/0, 7997 /*DelayTypeCreation=*/true); 7998 Context.getTypeDeclType(InjectedClassName, Record); 7999 InjectedClassName->setImplicit(); 8000 InjectedClassName->setAccess(AS_public); 8001 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 8002 InjectedClassName->setDescribedClassTemplate(Template); 8003 PushOnScopeChains(InjectedClassName, S); 8004 assert(InjectedClassName->isInjectedClassName() && 8005 "Broken injected-class-name"); 8006} 8007 8008void Sema::ActOnTagFinishDefinition(Scope *S, Decl *TagD, 8009 SourceLocation RBraceLoc) { 8010 AdjustDeclIfTemplate(TagD); 8011 TagDecl *Tag = cast<TagDecl>(TagD); 8012 Tag->setRBraceLoc(RBraceLoc); 8013 8014 if (isa<CXXRecordDecl>(Tag)) 8015 FieldCollector->FinishClass(); 8016 8017 // Exit this scope of this tag's definition. 8018 PopDeclContext(); 8019 8020 // Notify the consumer that we've defined a tag. 8021 Consumer.HandleTagDeclDefinition(Tag); 8022} 8023 8024void Sema::ActOnObjCContainerFinishDefinition() { 8025 // Exit this scope of this interface definition. 8026 PopDeclContext(); 8027} 8028 8029void Sema::ActOnTagDefinitionError(Scope *S, Decl *TagD) { 8030 AdjustDeclIfTemplate(TagD); 8031 TagDecl *Tag = cast<TagDecl>(TagD); 8032 Tag->setInvalidDecl(); 8033 8034 // We're undoing ActOnTagStartDefinition here, not 8035 // ActOnStartCXXMemberDeclarations, so we don't have to mess with 8036 // the FieldCollector. 8037 8038 PopDeclContext(); 8039} 8040 8041// Note that FieldName may be null for anonymous bitfields. 8042bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName, 8043 QualType FieldTy, const Expr *BitWidth, 8044 bool *ZeroWidth) { 8045 // Default to true; that shouldn't confuse checks for emptiness 8046 if (ZeroWidth) 8047 *ZeroWidth = true; 8048 8049 // C99 6.7.2.1p4 - verify the field type. 8050 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 8051 if (!FieldTy->isDependentType() && !FieldTy->isIntegralOrEnumerationType()) { 8052 // Handle incomplete types with specific error. 8053 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 8054 return true; 8055 if (FieldName) 8056 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 8057 << FieldName << FieldTy << BitWidth->getSourceRange(); 8058 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) 8059 << FieldTy << BitWidth->getSourceRange(); 8060 } else if (DiagnoseUnexpandedParameterPack(const_cast<Expr *>(BitWidth), 8061 UPPC_BitFieldWidth)) 8062 return true; 8063 8064 // If the bit-width is type- or value-dependent, don't try to check 8065 // it now. 8066 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 8067 return false; 8068 8069 llvm::APSInt Value; 8070 if (VerifyIntegerConstantExpression(BitWidth, &Value)) 8071 return true; 8072 8073 if (Value != 0 && ZeroWidth) 8074 *ZeroWidth = false; 8075 8076 // Zero-width bitfield is ok for anonymous field. 8077 if (Value == 0 && FieldName) 8078 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 8079 8080 if (Value.isSigned() && Value.isNegative()) { 8081 if (FieldName) 8082 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 8083 << FieldName << Value.toString(10); 8084 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) 8085 << Value.toString(10); 8086 } 8087 8088 if (!FieldTy->isDependentType()) { 8089 uint64_t TypeSize = Context.getTypeSize(FieldTy); 8090 if (Value.getZExtValue() > TypeSize) { 8091 if (!getLangOptions().CPlusPlus) { 8092 if (FieldName) 8093 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 8094 << FieldName << (unsigned)Value.getZExtValue() 8095 << (unsigned)TypeSize; 8096 8097 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) 8098 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 8099 } 8100 8101 if (FieldName) 8102 Diag(FieldLoc, diag::warn_bitfield_width_exceeds_type_size) 8103 << FieldName << (unsigned)Value.getZExtValue() 8104 << (unsigned)TypeSize; 8105 else 8106 Diag(FieldLoc, diag::warn_anon_bitfield_width_exceeds_type_size) 8107 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 8108 } 8109 } 8110 8111 return false; 8112} 8113 8114/// ActOnField - Each field of a C struct/union is passed into this in order 8115/// to create a FieldDecl object for it. 8116Decl *Sema::ActOnField(Scope *S, Decl *TagD, SourceLocation DeclStart, 8117 Declarator &D, Expr *BitfieldWidth) { 8118 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD), 8119 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 8120 /*HasInit=*/false, AS_public); 8121 return Res; 8122} 8123 8124/// HandleField - Analyze a field of a C struct or a C++ data member. 8125/// 8126FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 8127 SourceLocation DeclStart, 8128 Declarator &D, Expr *BitWidth, bool HasInit, 8129 AccessSpecifier AS) { 8130 IdentifierInfo *II = D.getIdentifier(); 8131 SourceLocation Loc = DeclStart; 8132 if (II) Loc = D.getIdentifierLoc(); 8133 8134 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8135 QualType T = TInfo->getType(); 8136 if (getLangOptions().CPlusPlus) { 8137 CheckExtraCXXDefaultArguments(D); 8138 8139 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 8140 UPPC_DataMemberType)) { 8141 D.setInvalidType(); 8142 T = Context.IntTy; 8143 TInfo = Context.getTrivialTypeSourceInfo(T, Loc); 8144 } 8145 } 8146 8147 DiagnoseFunctionSpecifiers(D); 8148 8149 if (D.getDeclSpec().isThreadSpecified()) 8150 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 8151 if (D.getDeclSpec().isConstexprSpecified()) 8152 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 8153 << 2; 8154 8155 // Check to see if this name was declared as a member previously 8156 LookupResult Previous(*this, II, Loc, LookupMemberName, ForRedeclaration); 8157 LookupName(Previous, S); 8158 assert((Previous.empty() || Previous.isOverloadedResult() || 8159 Previous.isSingleResult()) 8160 && "Lookup of member name should be either overloaded, single or null"); 8161 8162 // If the name is overloaded then get any declaration else get the single result 8163 NamedDecl *PrevDecl = Previous.isOverloadedResult() ? 8164 Previous.getRepresentativeDecl() : Previous.getAsSingle<NamedDecl>(); 8165 8166 if (PrevDecl && PrevDecl->isTemplateParameter()) { 8167 // Maybe we will complain about the shadowed template parameter. 8168 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 8169 // Just pretend that we didn't see the previous declaration. 8170 PrevDecl = 0; 8171 } 8172 8173 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 8174 PrevDecl = 0; 8175 8176 bool Mutable 8177 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable); 8178 SourceLocation TSSL = D.getSourceRange().getBegin(); 8179 FieldDecl *NewFD 8180 = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, HasInit, 8181 TSSL, AS, PrevDecl, &D); 8182 8183 if (NewFD->isInvalidDecl()) 8184 Record->setInvalidDecl(); 8185 8186 if (D.getDeclSpec().isModulePrivateSpecified()) 8187 NewFD->setModulePrivate(); 8188 8189 if (NewFD->isInvalidDecl() && PrevDecl) { 8190 // Don't introduce NewFD into scope; there's already something 8191 // with the same name in the same scope. 8192 } else if (II) { 8193 PushOnScopeChains(NewFD, S); 8194 } else 8195 Record->addDecl(NewFD); 8196 8197 return NewFD; 8198} 8199 8200/// \brief Build a new FieldDecl and check its well-formedness. 8201/// 8202/// This routine builds a new FieldDecl given the fields name, type, 8203/// record, etc. \p PrevDecl should refer to any previous declaration 8204/// with the same name and in the same scope as the field to be 8205/// created. 8206/// 8207/// \returns a new FieldDecl. 8208/// 8209/// \todo The Declarator argument is a hack. It will be removed once 8210FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 8211 TypeSourceInfo *TInfo, 8212 RecordDecl *Record, SourceLocation Loc, 8213 bool Mutable, Expr *BitWidth, bool HasInit, 8214 SourceLocation TSSL, 8215 AccessSpecifier AS, NamedDecl *PrevDecl, 8216 Declarator *D) { 8217 IdentifierInfo *II = Name.getAsIdentifierInfo(); 8218 bool InvalidDecl = false; 8219 if (D) InvalidDecl = D->isInvalidType(); 8220 8221 // If we receive a broken type, recover by assuming 'int' and 8222 // marking this declaration as invalid. 8223 if (T.isNull()) { 8224 InvalidDecl = true; 8225 T = Context.IntTy; 8226 } 8227 8228 QualType EltTy = Context.getBaseElementType(T); 8229 if (!EltTy->isDependentType() && 8230 RequireCompleteType(Loc, EltTy, diag::err_field_incomplete)) { 8231 // Fields of incomplete type force their record to be invalid. 8232 Record->setInvalidDecl(); 8233 InvalidDecl = true; 8234 } 8235 8236 // C99 6.7.2.1p8: A member of a structure or union may have any type other 8237 // than a variably modified type. 8238 if (!InvalidDecl && T->isVariablyModifiedType()) { 8239 bool SizeIsNegative; 8240 llvm::APSInt Oversized; 8241 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 8242 SizeIsNegative, 8243 Oversized); 8244 if (!FixedTy.isNull()) { 8245 Diag(Loc, diag::warn_illegal_constant_array_size); 8246 T = FixedTy; 8247 } else { 8248 if (SizeIsNegative) 8249 Diag(Loc, diag::err_typecheck_negative_array_size); 8250 else if (Oversized.getBoolValue()) 8251 Diag(Loc, diag::err_array_too_large) 8252 << Oversized.toString(10); 8253 else 8254 Diag(Loc, diag::err_typecheck_field_variable_size); 8255 InvalidDecl = true; 8256 } 8257 } 8258 8259 // Fields can not have abstract class types 8260 if (!InvalidDecl && RequireNonAbstractType(Loc, T, 8261 diag::err_abstract_type_in_decl, 8262 AbstractFieldType)) 8263 InvalidDecl = true; 8264 8265 bool ZeroWidth = false; 8266 // If this is declared as a bit-field, check the bit-field. 8267 if (!InvalidDecl && BitWidth && 8268 VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth)) { 8269 InvalidDecl = true; 8270 BitWidth = 0; 8271 ZeroWidth = false; 8272 } 8273 8274 // Check that 'mutable' is consistent with the type of the declaration. 8275 if (!InvalidDecl && Mutable) { 8276 unsigned DiagID = 0; 8277 if (T->isReferenceType()) 8278 DiagID = diag::err_mutable_reference; 8279 else if (T.isConstQualified()) 8280 DiagID = diag::err_mutable_const; 8281 8282 if (DiagID) { 8283 SourceLocation ErrLoc = Loc; 8284 if (D && D->getDeclSpec().getStorageClassSpecLoc().isValid()) 8285 ErrLoc = D->getDeclSpec().getStorageClassSpecLoc(); 8286 Diag(ErrLoc, DiagID); 8287 Mutable = false; 8288 InvalidDecl = true; 8289 } 8290 } 8291 8292 FieldDecl *NewFD = FieldDecl::Create(Context, Record, TSSL, Loc, II, T, TInfo, 8293 BitWidth, Mutable, HasInit); 8294 if (InvalidDecl) 8295 NewFD->setInvalidDecl(); 8296 8297 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 8298 Diag(Loc, diag::err_duplicate_member) << II; 8299 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 8300 NewFD->setInvalidDecl(); 8301 } 8302 8303 if (!InvalidDecl && getLangOptions().CPlusPlus) { 8304 if (Record->isUnion()) { 8305 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 8306 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 8307 if (RDecl->getDefinition()) { 8308 // C++ [class.union]p1: An object of a class with a non-trivial 8309 // constructor, a non-trivial copy constructor, a non-trivial 8310 // destructor, or a non-trivial copy assignment operator 8311 // cannot be a member of a union, nor can an array of such 8312 // objects. 8313 if (!getLangOptions().CPlusPlus0x && CheckNontrivialField(NewFD)) 8314 NewFD->setInvalidDecl(); 8315 } 8316 } 8317 8318 // C++ [class.union]p1: If a union contains a member of reference type, 8319 // the program is ill-formed. 8320 if (EltTy->isReferenceType()) { 8321 Diag(NewFD->getLocation(), diag::err_union_member_of_reference_type) 8322 << NewFD->getDeclName() << EltTy; 8323 NewFD->setInvalidDecl(); 8324 } 8325 } 8326 } 8327 8328 // FIXME: We need to pass in the attributes given an AST 8329 // representation, not a parser representation. 8330 if (D) 8331 // FIXME: What to pass instead of TUScope? 8332 ProcessDeclAttributes(TUScope, NewFD, *D); 8333 8334 // In auto-retain/release, infer strong retension for fields of 8335 // retainable type. 8336 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewFD)) 8337 NewFD->setInvalidDecl(); 8338 8339 if (T.isObjCGCWeak()) 8340 Diag(Loc, diag::warn_attribute_weak_on_field); 8341 8342 NewFD->setAccess(AS); 8343 return NewFD; 8344} 8345 8346bool Sema::CheckNontrivialField(FieldDecl *FD) { 8347 assert(FD); 8348 assert(getLangOptions().CPlusPlus && "valid check only for C++"); 8349 8350 if (FD->isInvalidDecl()) 8351 return true; 8352 8353 QualType EltTy = Context.getBaseElementType(FD->getType()); 8354 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 8355 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 8356 if (RDecl->getDefinition()) { 8357 // We check for copy constructors before constructors 8358 // because otherwise we'll never get complaints about 8359 // copy constructors. 8360 8361 CXXSpecialMember member = CXXInvalid; 8362 if (!RDecl->hasTrivialCopyConstructor()) 8363 member = CXXCopyConstructor; 8364 else if (!RDecl->hasTrivialDefaultConstructor()) 8365 member = CXXDefaultConstructor; 8366 else if (!RDecl->hasTrivialCopyAssignment()) 8367 member = CXXCopyAssignment; 8368 else if (!RDecl->hasTrivialDestructor()) 8369 member = CXXDestructor; 8370 8371 if (member != CXXInvalid) { 8372 if (getLangOptions().ObjCAutoRefCount && RDecl->hasObjectMember()) { 8373 // Objective-C++ ARC: it is an error to have a non-trivial field of 8374 // a union. However, system headers in Objective-C programs 8375 // occasionally have Objective-C lifetime objects within unions, 8376 // and rather than cause the program to fail, we make those 8377 // members unavailable. 8378 SourceLocation Loc = FD->getLocation(); 8379 if (getSourceManager().isInSystemHeader(Loc)) { 8380 if (!FD->hasAttr<UnavailableAttr>()) 8381 FD->addAttr(new (Context) UnavailableAttr(Loc, Context, 8382 "this system field has retaining ownership")); 8383 return false; 8384 } 8385 } 8386 8387 Diag(FD->getLocation(), diag::err_illegal_union_or_anon_struct_member) 8388 << (int)FD->getParent()->isUnion() << FD->getDeclName() << member; 8389 DiagnoseNontrivial(RT, member); 8390 return true; 8391 } 8392 } 8393 } 8394 8395 return false; 8396} 8397 8398/// DiagnoseNontrivial - Given that a class has a non-trivial 8399/// special member, figure out why. 8400void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) { 8401 QualType QT(T, 0U); 8402 CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl()); 8403 8404 // Check whether the member was user-declared. 8405 switch (member) { 8406 case CXXInvalid: 8407 break; 8408 8409 case CXXDefaultConstructor: 8410 if (RD->hasUserDeclaredConstructor()) { 8411 typedef CXXRecordDecl::ctor_iterator ctor_iter; 8412 for (ctor_iter ci = RD->ctor_begin(), ce = RD->ctor_end(); ci != ce;++ci){ 8413 const FunctionDecl *body = 0; 8414 ci->hasBody(body); 8415 if (!body || !cast<CXXConstructorDecl>(body)->isImplicitlyDefined()) { 8416 SourceLocation CtorLoc = ci->getLocation(); 8417 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8418 return; 8419 } 8420 } 8421 8422 llvm_unreachable("found no user-declared constructors"); 8423 } 8424 break; 8425 8426 case CXXCopyConstructor: 8427 if (RD->hasUserDeclaredCopyConstructor()) { 8428 SourceLocation CtorLoc = 8429 RD->getCopyConstructor(0)->getLocation(); 8430 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8431 return; 8432 } 8433 break; 8434 8435 case CXXMoveConstructor: 8436 if (RD->hasUserDeclaredMoveConstructor()) { 8437 SourceLocation CtorLoc = RD->getMoveConstructor()->getLocation(); 8438 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8439 return; 8440 } 8441 break; 8442 8443 case CXXCopyAssignment: 8444 if (RD->hasUserDeclaredCopyAssignment()) { 8445 // FIXME: this should use the location of the copy 8446 // assignment, not the type. 8447 SourceLocation TyLoc = RD->getSourceRange().getBegin(); 8448 Diag(TyLoc, diag::note_nontrivial_user_defined) << QT << member; 8449 return; 8450 } 8451 break; 8452 8453 case CXXMoveAssignment: 8454 if (RD->hasUserDeclaredMoveAssignment()) { 8455 SourceLocation AssignLoc = RD->getMoveAssignmentOperator()->getLocation(); 8456 Diag(AssignLoc, diag::note_nontrivial_user_defined) << QT << member; 8457 return; 8458 } 8459 break; 8460 8461 case CXXDestructor: 8462 if (RD->hasUserDeclaredDestructor()) { 8463 SourceLocation DtorLoc = LookupDestructor(RD)->getLocation(); 8464 Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8465 return; 8466 } 8467 break; 8468 } 8469 8470 typedef CXXRecordDecl::base_class_iterator base_iter; 8471 8472 // Virtual bases and members inhibit trivial copying/construction, 8473 // but not trivial destruction. 8474 if (member != CXXDestructor) { 8475 // Check for virtual bases. vbases includes indirect virtual bases, 8476 // so we just iterate through the direct bases. 8477 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) 8478 if (bi->isVirtual()) { 8479 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 8480 Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1; 8481 return; 8482 } 8483 8484 // Check for virtual methods. 8485 typedef CXXRecordDecl::method_iterator meth_iter; 8486 for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me; 8487 ++mi) { 8488 if (mi->isVirtual()) { 8489 SourceLocation MLoc = mi->getSourceRange().getBegin(); 8490 Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0; 8491 return; 8492 } 8493 } 8494 } 8495 8496 bool (CXXRecordDecl::*hasTrivial)() const; 8497 switch (member) { 8498 case CXXDefaultConstructor: 8499 hasTrivial = &CXXRecordDecl::hasTrivialDefaultConstructor; break; 8500 case CXXCopyConstructor: 8501 hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break; 8502 case CXXCopyAssignment: 8503 hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break; 8504 case CXXDestructor: 8505 hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break; 8506 default: 8507 llvm_unreachable("unexpected special member"); 8508 } 8509 8510 // Check for nontrivial bases (and recurse). 8511 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) { 8512 const RecordType *BaseRT = bi->getType()->getAs<RecordType>(); 8513 assert(BaseRT && "Don't know how to handle dependent bases"); 8514 CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl()); 8515 if (!(BaseRecTy->*hasTrivial)()) { 8516 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 8517 Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member; 8518 DiagnoseNontrivial(BaseRT, member); 8519 return; 8520 } 8521 } 8522 8523 // Check for nontrivial members (and recurse). 8524 typedef RecordDecl::field_iterator field_iter; 8525 for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe; 8526 ++fi) { 8527 QualType EltTy = Context.getBaseElementType((*fi)->getType()); 8528 if (const RecordType *EltRT = EltTy->getAs<RecordType>()) { 8529 CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl()); 8530 8531 if (!(EltRD->*hasTrivial)()) { 8532 SourceLocation FLoc = (*fi)->getLocation(); 8533 Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member; 8534 DiagnoseNontrivial(EltRT, member); 8535 return; 8536 } 8537 } 8538 8539 if (EltTy->isObjCLifetimeType()) { 8540 switch (EltTy.getObjCLifetime()) { 8541 case Qualifiers::OCL_None: 8542 case Qualifiers::OCL_ExplicitNone: 8543 break; 8544 8545 case Qualifiers::OCL_Autoreleasing: 8546 case Qualifiers::OCL_Weak: 8547 case Qualifiers::OCL_Strong: 8548 Diag((*fi)->getLocation(), diag::note_nontrivial_objc_ownership) 8549 << QT << EltTy.getObjCLifetime(); 8550 return; 8551 } 8552 } 8553 } 8554 8555 llvm_unreachable("found no explanation for non-trivial member"); 8556} 8557 8558/// TranslateIvarVisibility - Translate visibility from a token ID to an 8559/// AST enum value. 8560static ObjCIvarDecl::AccessControl 8561TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 8562 switch (ivarVisibility) { 8563 default: llvm_unreachable("Unknown visitibility kind"); 8564 case tok::objc_private: return ObjCIvarDecl::Private; 8565 case tok::objc_public: return ObjCIvarDecl::Public; 8566 case tok::objc_protected: return ObjCIvarDecl::Protected; 8567 case tok::objc_package: return ObjCIvarDecl::Package; 8568 } 8569} 8570 8571/// ActOnIvar - Each ivar field of an objective-c class is passed into this 8572/// in order to create an IvarDecl object for it. 8573Decl *Sema::ActOnIvar(Scope *S, 8574 SourceLocation DeclStart, 8575 Declarator &D, Expr *BitfieldWidth, 8576 tok::ObjCKeywordKind Visibility) { 8577 8578 IdentifierInfo *II = D.getIdentifier(); 8579 Expr *BitWidth = (Expr*)BitfieldWidth; 8580 SourceLocation Loc = DeclStart; 8581 if (II) Loc = D.getIdentifierLoc(); 8582 8583 // FIXME: Unnamed fields can be handled in various different ways, for 8584 // example, unnamed unions inject all members into the struct namespace! 8585 8586 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8587 QualType T = TInfo->getType(); 8588 8589 if (BitWidth) { 8590 // 6.7.2.1p3, 6.7.2.1p4 8591 if (VerifyBitField(Loc, II, T, BitWidth)) { 8592 D.setInvalidType(); 8593 BitWidth = 0; 8594 } 8595 } else { 8596 // Not a bitfield. 8597 8598 // validate II. 8599 8600 } 8601 if (T->isReferenceType()) { 8602 Diag(Loc, diag::err_ivar_reference_type); 8603 D.setInvalidType(); 8604 } 8605 // C99 6.7.2.1p8: A member of a structure or union may have any type other 8606 // than a variably modified type. 8607 else if (T->isVariablyModifiedType()) { 8608 Diag(Loc, diag::err_typecheck_ivar_variable_size); 8609 D.setInvalidType(); 8610 } 8611 8612 // Get the visibility (access control) for this ivar. 8613 ObjCIvarDecl::AccessControl ac = 8614 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 8615 : ObjCIvarDecl::None; 8616 // Must set ivar's DeclContext to its enclosing interface. 8617 ObjCContainerDecl *EnclosingDecl = cast<ObjCContainerDecl>(CurContext); 8618 ObjCContainerDecl *EnclosingContext; 8619 if (ObjCImplementationDecl *IMPDecl = 8620 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 8621 if (!LangOpts.ObjCNonFragileABI2) { 8622 // Case of ivar declared in an implementation. Context is that of its class. 8623 EnclosingContext = IMPDecl->getClassInterface(); 8624 assert(EnclosingContext && "Implementation has no class interface!"); 8625 } 8626 else 8627 EnclosingContext = EnclosingDecl; 8628 } else { 8629 if (ObjCCategoryDecl *CDecl = 8630 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 8631 if (!LangOpts.ObjCNonFragileABI2 || !CDecl->IsClassExtension()) { 8632 Diag(Loc, diag::err_misplaced_ivar) << CDecl->IsClassExtension(); 8633 return 0; 8634 } 8635 } 8636 EnclosingContext = EnclosingDecl; 8637 } 8638 8639 // Construct the decl. 8640 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, EnclosingContext, 8641 DeclStart, Loc, II, T, 8642 TInfo, ac, (Expr *)BitfieldWidth); 8643 8644 if (II) { 8645 NamedDecl *PrevDecl = LookupSingleName(S, II, Loc, LookupMemberName, 8646 ForRedeclaration); 8647 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S) 8648 && !isa<TagDecl>(PrevDecl)) { 8649 Diag(Loc, diag::err_duplicate_member) << II; 8650 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 8651 NewID->setInvalidDecl(); 8652 } 8653 } 8654 8655 // Process attributes attached to the ivar. 8656 ProcessDeclAttributes(S, NewID, D); 8657 8658 if (D.isInvalidType()) 8659 NewID->setInvalidDecl(); 8660 8661 // In ARC, infer 'retaining' for ivars of retainable type. 8662 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewID)) 8663 NewID->setInvalidDecl(); 8664 8665 if (D.getDeclSpec().isModulePrivateSpecified()) 8666 NewID->setModulePrivate(); 8667 8668 if (II) { 8669 // FIXME: When interfaces are DeclContexts, we'll need to add 8670 // these to the interface. 8671 S->AddDecl(NewID); 8672 IdResolver.AddDecl(NewID); 8673 } 8674 8675 return NewID; 8676} 8677 8678/// ActOnLastBitfield - This routine handles synthesized bitfields rules for 8679/// class and class extensions. For every class @interface and class 8680/// extension @interface, if the last ivar is a bitfield of any type, 8681/// then add an implicit `char :0` ivar to the end of that interface. 8682void Sema::ActOnLastBitfield(SourceLocation DeclLoc, 8683 SmallVectorImpl<Decl *> &AllIvarDecls) { 8684 if (!LangOpts.ObjCNonFragileABI2 || AllIvarDecls.empty()) 8685 return; 8686 8687 Decl *ivarDecl = AllIvarDecls[AllIvarDecls.size()-1]; 8688 ObjCIvarDecl *Ivar = cast<ObjCIvarDecl>(ivarDecl); 8689 8690 if (!Ivar->isBitField()) 8691 return; 8692 uint64_t BitFieldSize = 8693 Ivar->getBitWidth()->EvaluateAsInt(Context).getZExtValue(); 8694 if (BitFieldSize == 0) 8695 return; 8696 ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(CurContext); 8697 if (!ID) { 8698 if (ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(CurContext)) { 8699 if (!CD->IsClassExtension()) 8700 return; 8701 } 8702 // No need to add this to end of @implementation. 8703 else 8704 return; 8705 } 8706 // All conditions are met. Add a new bitfield to the tail end of ivars. 8707 llvm::APInt Zero(Context.getTypeSize(Context.IntTy), 0); 8708 Expr * BW = IntegerLiteral::Create(Context, Zero, Context.IntTy, DeclLoc); 8709 8710 Ivar = ObjCIvarDecl::Create(Context, cast<ObjCContainerDecl>(CurContext), 8711 DeclLoc, DeclLoc, 0, 8712 Context.CharTy, 8713 Context.getTrivialTypeSourceInfo(Context.CharTy, 8714 DeclLoc), 8715 ObjCIvarDecl::Private, BW, 8716 true); 8717 AllIvarDecls.push_back(Ivar); 8718} 8719 8720void Sema::ActOnFields(Scope* S, 8721 SourceLocation RecLoc, Decl *EnclosingDecl, 8722 llvm::ArrayRef<Decl *> Fields, 8723 SourceLocation LBrac, SourceLocation RBrac, 8724 AttributeList *Attr) { 8725 assert(EnclosingDecl && "missing record or interface decl"); 8726 8727 // If the decl this is being inserted into is invalid, then it may be a 8728 // redeclaration or some other bogus case. Don't try to add fields to it. 8729 if (EnclosingDecl->isInvalidDecl()) 8730 return; 8731 8732 // Verify that all the fields are okay. 8733 unsigned NumNamedMembers = 0; 8734 SmallVector<FieldDecl*, 32> RecFields; 8735 8736 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 8737 bool ARCErrReported = false; 8738 for (llvm::ArrayRef<Decl *>::iterator i = Fields.begin(), end = Fields.end(); 8739 i != end; ++i) { 8740 FieldDecl *FD = cast<FieldDecl>(*i); 8741 8742 // Get the type for the field. 8743 const Type *FDTy = FD->getType().getTypePtr(); 8744 8745 if (!FD->isAnonymousStructOrUnion()) { 8746 // Remember all fields written by the user. 8747 RecFields.push_back(FD); 8748 } 8749 8750 // If the field is already invalid for some reason, don't emit more 8751 // diagnostics about it. 8752 if (FD->isInvalidDecl()) { 8753 EnclosingDecl->setInvalidDecl(); 8754 continue; 8755 } 8756 8757 // C99 6.7.2.1p2: 8758 // A structure or union shall not contain a member with 8759 // incomplete or function type (hence, a structure shall not 8760 // contain an instance of itself, but may contain a pointer to 8761 // an instance of itself), except that the last member of a 8762 // structure with more than one named member may have incomplete 8763 // array type; such a structure (and any union containing, 8764 // possibly recursively, a member that is such a structure) 8765 // shall not be a member of a structure or an element of an 8766 // array. 8767 if (FDTy->isFunctionType()) { 8768 // Field declared as a function. 8769 Diag(FD->getLocation(), diag::err_field_declared_as_function) 8770 << FD->getDeclName(); 8771 FD->setInvalidDecl(); 8772 EnclosingDecl->setInvalidDecl(); 8773 continue; 8774 } else if (FDTy->isIncompleteArrayType() && Record && 8775 ((i + 1 == Fields.end() && !Record->isUnion()) || 8776 ((getLangOptions().MicrosoftExt || 8777 getLangOptions().CPlusPlus) && 8778 (i + 1 == Fields.end() || Record->isUnion())))) { 8779 // Flexible array member. 8780 // Microsoft and g++ is more permissive regarding flexible array. 8781 // It will accept flexible array in union and also 8782 // as the sole element of a struct/class. 8783 if (getLangOptions().MicrosoftExt) { 8784 if (Record->isUnion()) 8785 Diag(FD->getLocation(), diag::ext_flexible_array_union_ms) 8786 << FD->getDeclName(); 8787 else if (Fields.size() == 1) 8788 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_ms) 8789 << FD->getDeclName() << Record->getTagKind(); 8790 } else if (getLangOptions().CPlusPlus) { 8791 if (Record->isUnion()) 8792 Diag(FD->getLocation(), diag::ext_flexible_array_union_gnu) 8793 << FD->getDeclName(); 8794 else if (Fields.size() == 1) 8795 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_gnu) 8796 << FD->getDeclName() << Record->getTagKind(); 8797 } else if (NumNamedMembers < 1) { 8798 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 8799 << FD->getDeclName(); 8800 FD->setInvalidDecl(); 8801 EnclosingDecl->setInvalidDecl(); 8802 continue; 8803 } 8804 if (!FD->getType()->isDependentType() && 8805 !Context.getBaseElementType(FD->getType()).isPODType(Context)) { 8806 Diag(FD->getLocation(), diag::err_flexible_array_has_nonpod_type) 8807 << FD->getDeclName() << FD->getType(); 8808 FD->setInvalidDecl(); 8809 EnclosingDecl->setInvalidDecl(); 8810 continue; 8811 } 8812 // Okay, we have a legal flexible array member at the end of the struct. 8813 if (Record) 8814 Record->setHasFlexibleArrayMember(true); 8815 } else if (!FDTy->isDependentType() && 8816 RequireCompleteType(FD->getLocation(), FD->getType(), 8817 diag::err_field_incomplete)) { 8818 // Incomplete type 8819 FD->setInvalidDecl(); 8820 EnclosingDecl->setInvalidDecl(); 8821 continue; 8822 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) { 8823 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 8824 // If this is a member of a union, then entire union becomes "flexible". 8825 if (Record && Record->isUnion()) { 8826 Record->setHasFlexibleArrayMember(true); 8827 } else { 8828 // If this is a struct/class and this is not the last element, reject 8829 // it. Note that GCC supports variable sized arrays in the middle of 8830 // structures. 8831 if (i + 1 != Fields.end()) 8832 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 8833 << FD->getDeclName() << FD->getType(); 8834 else { 8835 // We support flexible arrays at the end of structs in 8836 // other structs as an extension. 8837 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 8838 << FD->getDeclName(); 8839 if (Record) 8840 Record->setHasFlexibleArrayMember(true); 8841 } 8842 } 8843 } 8844 if (Record && FDTTy->getDecl()->hasObjectMember()) 8845 Record->setHasObjectMember(true); 8846 } else if (FDTy->isObjCObjectType()) { 8847 /// A field cannot be an Objective-c object 8848 Diag(FD->getLocation(), diag::err_statically_allocated_object) 8849 << FixItHint::CreateInsertion(FD->getLocation(), "*"); 8850 QualType T = Context.getObjCObjectPointerType(FD->getType()); 8851 FD->setType(T); 8852 } 8853 else if (!getLangOptions().CPlusPlus) { 8854 if (getLangOptions().ObjCAutoRefCount && Record && !ARCErrReported) { 8855 // It's an error in ARC if a field has lifetime. 8856 // We don't want to report this in a system header, though, 8857 // so we just make the field unavailable. 8858 // FIXME: that's really not sufficient; we need to make the type 8859 // itself invalid to, say, initialize or copy. 8860 QualType T = FD->getType(); 8861 Qualifiers::ObjCLifetime lifetime = T.getObjCLifetime(); 8862 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone) { 8863 SourceLocation loc = FD->getLocation(); 8864 if (getSourceManager().isInSystemHeader(loc)) { 8865 if (!FD->hasAttr<UnavailableAttr>()) { 8866 FD->addAttr(new (Context) UnavailableAttr(loc, Context, 8867 "this system field has retaining ownership")); 8868 } 8869 } else { 8870 Diag(FD->getLocation(), diag::err_arc_objc_object_in_struct); 8871 } 8872 ARCErrReported = true; 8873 } 8874 } 8875 else if (getLangOptions().ObjC1 && 8876 getLangOptions().getGC() != LangOptions::NonGC && 8877 Record && !Record->hasObjectMember()) { 8878 if (FD->getType()->isObjCObjectPointerType() || 8879 FD->getType().isObjCGCStrong()) 8880 Record->setHasObjectMember(true); 8881 else if (Context.getAsArrayType(FD->getType())) { 8882 QualType BaseType = Context.getBaseElementType(FD->getType()); 8883 if (BaseType->isRecordType() && 8884 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()) 8885 Record->setHasObjectMember(true); 8886 else if (BaseType->isObjCObjectPointerType() || 8887 BaseType.isObjCGCStrong()) 8888 Record->setHasObjectMember(true); 8889 } 8890 } 8891 } 8892 // Keep track of the number of named members. 8893 if (FD->getIdentifier()) 8894 ++NumNamedMembers; 8895 } 8896 8897 // Okay, we successfully defined 'Record'. 8898 if (Record) { 8899 bool Completed = false; 8900 if (CXXRecordDecl *CXXRecord = dyn_cast<CXXRecordDecl>(Record)) { 8901 if (!CXXRecord->isInvalidDecl()) { 8902 // Set access bits correctly on the directly-declared conversions. 8903 UnresolvedSetImpl *Convs = CXXRecord->getConversionFunctions(); 8904 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); 8905 I != E; ++I) 8906 Convs->setAccess(I, (*I)->getAccess()); 8907 8908 if (!CXXRecord->isDependentType()) { 8909 // Objective-C Automatic Reference Counting: 8910 // If a class has a non-static data member of Objective-C pointer 8911 // type (or array thereof), it is a non-POD type and its 8912 // default constructor (if any), copy constructor, copy assignment 8913 // operator, and destructor are non-trivial. 8914 // 8915 // This rule is also handled by CXXRecordDecl::completeDefinition(). 8916 // However, here we check whether this particular class is only 8917 // non-POD because of the presence of an Objective-C pointer member. 8918 // If so, objects of this type cannot be shared between code compiled 8919 // with instant objects and code compiled with manual retain/release. 8920 if (getLangOptions().ObjCAutoRefCount && 8921 CXXRecord->hasObjectMember() && 8922 CXXRecord->getLinkage() == ExternalLinkage) { 8923 if (CXXRecord->isPOD()) { 8924 Diag(CXXRecord->getLocation(), 8925 diag::warn_arc_non_pod_class_with_object_member) 8926 << CXXRecord; 8927 } else { 8928 // FIXME: Fix-Its would be nice here, but finding a good location 8929 // for them is going to be tricky. 8930 if (CXXRecord->hasTrivialCopyConstructor()) 8931 Diag(CXXRecord->getLocation(), 8932 diag::warn_arc_trivial_member_function_with_object_member) 8933 << CXXRecord << 0; 8934 if (CXXRecord->hasTrivialCopyAssignment()) 8935 Diag(CXXRecord->getLocation(), 8936 diag::warn_arc_trivial_member_function_with_object_member) 8937 << CXXRecord << 1; 8938 if (CXXRecord->hasTrivialDestructor()) 8939 Diag(CXXRecord->getLocation(), 8940 diag::warn_arc_trivial_member_function_with_object_member) 8941 << CXXRecord << 2; 8942 } 8943 } 8944 8945 // Adjust user-defined destructor exception spec. 8946 if (getLangOptions().CPlusPlus0x && 8947 CXXRecord->hasUserDeclaredDestructor()) 8948 AdjustDestructorExceptionSpec(CXXRecord,CXXRecord->getDestructor()); 8949 8950 // Add any implicitly-declared members to this class. 8951 AddImplicitlyDeclaredMembersToClass(CXXRecord); 8952 8953 // If we have virtual base classes, we may end up finding multiple 8954 // final overriders for a given virtual function. Check for this 8955 // problem now. 8956 if (CXXRecord->getNumVBases()) { 8957 CXXFinalOverriderMap FinalOverriders; 8958 CXXRecord->getFinalOverriders(FinalOverriders); 8959 8960 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 8961 MEnd = FinalOverriders.end(); 8962 M != MEnd; ++M) { 8963 for (OverridingMethods::iterator SO = M->second.begin(), 8964 SOEnd = M->second.end(); 8965 SO != SOEnd; ++SO) { 8966 assert(SO->second.size() > 0 && 8967 "Virtual function without overridding functions?"); 8968 if (SO->second.size() == 1) 8969 continue; 8970 8971 // C++ [class.virtual]p2: 8972 // In a derived class, if a virtual member function of a base 8973 // class subobject has more than one final overrider the 8974 // program is ill-formed. 8975 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 8976 << (NamedDecl *)M->first << Record; 8977 Diag(M->first->getLocation(), 8978 diag::note_overridden_virtual_function); 8979 for (OverridingMethods::overriding_iterator 8980 OM = SO->second.begin(), 8981 OMEnd = SO->second.end(); 8982 OM != OMEnd; ++OM) 8983 Diag(OM->Method->getLocation(), diag::note_final_overrider) 8984 << (NamedDecl *)M->first << OM->Method->getParent(); 8985 8986 Record->setInvalidDecl(); 8987 } 8988 } 8989 CXXRecord->completeDefinition(&FinalOverriders); 8990 Completed = true; 8991 } 8992 } 8993 } 8994 } 8995 8996 if (!Completed) 8997 Record->completeDefinition(); 8998 8999 // Now that the record is complete, do any delayed exception spec checks 9000 // we were missing. 9001 while (!DelayedDestructorExceptionSpecChecks.empty()) { 9002 const CXXDestructorDecl *Dtor = 9003 DelayedDestructorExceptionSpecChecks.back().first; 9004 if (Dtor->getParent() != Record) 9005 break; 9006 9007 assert(!Dtor->getParent()->isDependentType() && 9008 "Should not ever add destructors of templates into the list."); 9009 CheckOverridingFunctionExceptionSpec(Dtor, 9010 DelayedDestructorExceptionSpecChecks.back().second); 9011 DelayedDestructorExceptionSpecChecks.pop_back(); 9012 } 9013 9014 } else { 9015 ObjCIvarDecl **ClsFields = 9016 reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); 9017 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 9018 ID->setLocEnd(RBrac); 9019 // Add ivar's to class's DeclContext. 9020 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 9021 ClsFields[i]->setLexicalDeclContext(ID); 9022 ID->addDecl(ClsFields[i]); 9023 } 9024 // Must enforce the rule that ivars in the base classes may not be 9025 // duplicates. 9026 if (ID->getSuperClass()) 9027 DiagnoseDuplicateIvars(ID, ID->getSuperClass()); 9028 } else if (ObjCImplementationDecl *IMPDecl = 9029 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 9030 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 9031 for (unsigned I = 0, N = RecFields.size(); I != N; ++I) 9032 // Ivar declared in @implementation never belongs to the implementation. 9033 // Only it is in implementation's lexical context. 9034 ClsFields[I]->setLexicalDeclContext(IMPDecl); 9035 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 9036 } else if (ObjCCategoryDecl *CDecl = 9037 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 9038 // case of ivars in class extension; all other cases have been 9039 // reported as errors elsewhere. 9040 // FIXME. Class extension does not have a LocEnd field. 9041 // CDecl->setLocEnd(RBrac); 9042 // Add ivar's to class extension's DeclContext. 9043 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 9044 ClsFields[i]->setLexicalDeclContext(CDecl); 9045 CDecl->addDecl(ClsFields[i]); 9046 } 9047 } 9048 } 9049 9050 if (Attr) 9051 ProcessDeclAttributeList(S, Record, Attr); 9052 9053 // If there's a #pragma GCC visibility in scope, and this isn't a subclass, 9054 // set the visibility of this record. 9055 if (Record && !Record->getDeclContext()->isRecord()) 9056 AddPushedVisibilityAttribute(Record); 9057} 9058 9059/// \brief Determine whether the given integral value is representable within 9060/// the given type T. 9061static bool isRepresentableIntegerValue(ASTContext &Context, 9062 llvm::APSInt &Value, 9063 QualType T) { 9064 assert(T->isIntegralType(Context) && "Integral type required!"); 9065 unsigned BitWidth = Context.getIntWidth(T); 9066 9067 if (Value.isUnsigned() || Value.isNonNegative()) { 9068 if (T->isSignedIntegerOrEnumerationType()) 9069 --BitWidth; 9070 return Value.getActiveBits() <= BitWidth; 9071 } 9072 return Value.getMinSignedBits() <= BitWidth; 9073} 9074 9075// \brief Given an integral type, return the next larger integral type 9076// (or a NULL type of no such type exists). 9077static QualType getNextLargerIntegralType(ASTContext &Context, QualType T) { 9078 // FIXME: Int128/UInt128 support, which also needs to be introduced into 9079 // enum checking below. 9080 assert(T->isIntegralType(Context) && "Integral type required!"); 9081 const unsigned NumTypes = 4; 9082 QualType SignedIntegralTypes[NumTypes] = { 9083 Context.ShortTy, Context.IntTy, Context.LongTy, Context.LongLongTy 9084 }; 9085 QualType UnsignedIntegralTypes[NumTypes] = { 9086 Context.UnsignedShortTy, Context.UnsignedIntTy, Context.UnsignedLongTy, 9087 Context.UnsignedLongLongTy 9088 }; 9089 9090 unsigned BitWidth = Context.getTypeSize(T); 9091 QualType *Types = T->isSignedIntegerOrEnumerationType()? SignedIntegralTypes 9092 : UnsignedIntegralTypes; 9093 for (unsigned I = 0; I != NumTypes; ++I) 9094 if (Context.getTypeSize(Types[I]) > BitWidth) 9095 return Types[I]; 9096 9097 return QualType(); 9098} 9099 9100EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 9101 EnumConstantDecl *LastEnumConst, 9102 SourceLocation IdLoc, 9103 IdentifierInfo *Id, 9104 Expr *Val) { 9105 unsigned IntWidth = Context.getTargetInfo().getIntWidth(); 9106 llvm::APSInt EnumVal(IntWidth); 9107 QualType EltTy; 9108 9109 if (Val && DiagnoseUnexpandedParameterPack(Val, UPPC_EnumeratorValue)) 9110 Val = 0; 9111 9112 if (Val) { 9113 if (Enum->isDependentType() || Val->isTypeDependent()) 9114 EltTy = Context.DependentTy; 9115 else { 9116 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 9117 SourceLocation ExpLoc; 9118 if (!Val->isValueDependent() && 9119 VerifyIntegerConstantExpression(Val, &EnumVal)) { 9120 Val = 0; 9121 } else { 9122 if (!getLangOptions().CPlusPlus) { 9123 // C99 6.7.2.2p2: 9124 // The expression that defines the value of an enumeration constant 9125 // shall be an integer constant expression that has a value 9126 // representable as an int. 9127 9128 // Complain if the value is not representable in an int. 9129 if (!isRepresentableIntegerValue(Context, EnumVal, Context.IntTy)) 9130 Diag(IdLoc, diag::ext_enum_value_not_int) 9131 << EnumVal.toString(10) << Val->getSourceRange() 9132 << (EnumVal.isUnsigned() || EnumVal.isNonNegative()); 9133 else if (!Context.hasSameType(Val->getType(), Context.IntTy)) { 9134 // Force the type of the expression to 'int'. 9135 Val = ImpCastExprToType(Val, Context.IntTy, CK_IntegralCast).take(); 9136 } 9137 } 9138 9139 if (Enum->isFixed()) { 9140 EltTy = Enum->getIntegerType(); 9141 9142 // C++0x [dcl.enum]p5: 9143 // ... if the initializing value of an enumerator cannot be 9144 // represented by the underlying type, the program is ill-formed. 9145 if (!isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 9146 if (getLangOptions().MicrosoftExt) { 9147 Diag(IdLoc, diag::ext_enumerator_too_large) << EltTy; 9148 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 9149 } else 9150 Diag(IdLoc, diag::err_enumerator_too_large) 9151 << EltTy; 9152 } else 9153 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 9154 } 9155 else { 9156 // C++0x [dcl.enum]p5: 9157 // If the underlying type is not fixed, the type of each enumerator 9158 // is the type of its initializing value: 9159 // - If an initializer is specified for an enumerator, the 9160 // initializing value has the same type as the expression. 9161 EltTy = Val->getType(); 9162 } 9163 } 9164 } 9165 } 9166 9167 if (!Val) { 9168 if (Enum->isDependentType()) 9169 EltTy = Context.DependentTy; 9170 else if (!LastEnumConst) { 9171 // C++0x [dcl.enum]p5: 9172 // If the underlying type is not fixed, the type of each enumerator 9173 // is the type of its initializing value: 9174 // - If no initializer is specified for the first enumerator, the 9175 // initializing value has an unspecified integral type. 9176 // 9177 // GCC uses 'int' for its unspecified integral type, as does 9178 // C99 6.7.2.2p3. 9179 if (Enum->isFixed()) { 9180 EltTy = Enum->getIntegerType(); 9181 } 9182 else { 9183 EltTy = Context.IntTy; 9184 } 9185 } else { 9186 // Assign the last value + 1. 9187 EnumVal = LastEnumConst->getInitVal(); 9188 ++EnumVal; 9189 EltTy = LastEnumConst->getType(); 9190 9191 // Check for overflow on increment. 9192 if (EnumVal < LastEnumConst->getInitVal()) { 9193 // C++0x [dcl.enum]p5: 9194 // If the underlying type is not fixed, the type of each enumerator 9195 // is the type of its initializing value: 9196 // 9197 // - Otherwise the type of the initializing value is the same as 9198 // the type of the initializing value of the preceding enumerator 9199 // unless the incremented value is not representable in that type, 9200 // in which case the type is an unspecified integral type 9201 // sufficient to contain the incremented value. If no such type 9202 // exists, the program is ill-formed. 9203 QualType T = getNextLargerIntegralType(Context, EltTy); 9204 if (T.isNull() || Enum->isFixed()) { 9205 // There is no integral type larger enough to represent this 9206 // value. Complain, then allow the value to wrap around. 9207 EnumVal = LastEnumConst->getInitVal(); 9208 EnumVal = EnumVal.zext(EnumVal.getBitWidth() * 2); 9209 ++EnumVal; 9210 if (Enum->isFixed()) 9211 // When the underlying type is fixed, this is ill-formed. 9212 Diag(IdLoc, diag::err_enumerator_wrapped) 9213 << EnumVal.toString(10) 9214 << EltTy; 9215 else 9216 Diag(IdLoc, diag::warn_enumerator_too_large) 9217 << EnumVal.toString(10); 9218 } else { 9219 EltTy = T; 9220 } 9221 9222 // Retrieve the last enumerator's value, extent that type to the 9223 // type that is supposed to be large enough to represent the incremented 9224 // value, then increment. 9225 EnumVal = LastEnumConst->getInitVal(); 9226 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 9227 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 9228 ++EnumVal; 9229 9230 // If we're not in C++, diagnose the overflow of enumerator values, 9231 // which in C99 means that the enumerator value is not representable in 9232 // an int (C99 6.7.2.2p2). However, we support GCC's extension that 9233 // permits enumerator values that are representable in some larger 9234 // integral type. 9235 if (!getLangOptions().CPlusPlus && !T.isNull()) 9236 Diag(IdLoc, diag::warn_enum_value_overflow); 9237 } else if (!getLangOptions().CPlusPlus && 9238 !isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 9239 // Enforce C99 6.7.2.2p2 even when we compute the next value. 9240 Diag(IdLoc, diag::ext_enum_value_not_int) 9241 << EnumVal.toString(10) << 1; 9242 } 9243 } 9244 } 9245 9246 if (!EltTy->isDependentType()) { 9247 // Make the enumerator value match the signedness and size of the 9248 // enumerator's type. 9249 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 9250 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 9251 } 9252 9253 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 9254 Val, EnumVal); 9255} 9256 9257 9258Decl *Sema::ActOnEnumConstant(Scope *S, Decl *theEnumDecl, Decl *lastEnumConst, 9259 SourceLocation IdLoc, IdentifierInfo *Id, 9260 AttributeList *Attr, 9261 SourceLocation EqualLoc, Expr *val) { 9262 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl); 9263 EnumConstantDecl *LastEnumConst = 9264 cast_or_null<EnumConstantDecl>(lastEnumConst); 9265 Expr *Val = static_cast<Expr*>(val); 9266 9267 // The scope passed in may not be a decl scope. Zip up the scope tree until 9268 // we find one that is. 9269 S = getNonFieldDeclScope(S); 9270 9271 // Verify that there isn't already something declared with this name in this 9272 // scope. 9273 NamedDecl *PrevDecl = LookupSingleName(S, Id, IdLoc, LookupOrdinaryName, 9274 ForRedeclaration); 9275 if (PrevDecl && PrevDecl->isTemplateParameter()) { 9276 // Maybe we will complain about the shadowed template parameter. 9277 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 9278 // Just pretend that we didn't see the previous declaration. 9279 PrevDecl = 0; 9280 } 9281 9282 if (PrevDecl) { 9283 // When in C++, we may get a TagDecl with the same name; in this case the 9284 // enum constant will 'hide' the tag. 9285 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 9286 "Received TagDecl when not in C++!"); 9287 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 9288 if (isa<EnumConstantDecl>(PrevDecl)) 9289 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 9290 else 9291 Diag(IdLoc, diag::err_redefinition) << Id; 9292 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 9293 return 0; 9294 } 9295 } 9296 9297 // C++ [class.mem]p13: 9298 // If T is the name of a class, then each of the following shall have a 9299 // name different from T: 9300 // - every enumerator of every member of class T that is an enumerated 9301 // type 9302 if (CXXRecordDecl *Record 9303 = dyn_cast<CXXRecordDecl>( 9304 TheEnumDecl->getDeclContext()->getRedeclContext())) 9305 if (Record->getIdentifier() && Record->getIdentifier() == Id) 9306 Diag(IdLoc, diag::err_member_name_of_class) << Id; 9307 9308 EnumConstantDecl *New = 9309 CheckEnumConstant(TheEnumDecl, LastEnumConst, IdLoc, Id, Val); 9310 9311 if (New) { 9312 // Process attributes. 9313 if (Attr) ProcessDeclAttributeList(S, New, Attr); 9314 9315 // Register this decl in the current scope stack. 9316 New->setAccess(TheEnumDecl->getAccess()); 9317 PushOnScopeChains(New, S); 9318 } 9319 9320 return New; 9321} 9322 9323void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc, 9324 SourceLocation RBraceLoc, Decl *EnumDeclX, 9325 Decl **Elements, unsigned NumElements, 9326 Scope *S, AttributeList *Attr) { 9327 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX); 9328 QualType EnumType = Context.getTypeDeclType(Enum); 9329 9330 if (Attr) 9331 ProcessDeclAttributeList(S, Enum, Attr); 9332 9333 if (Enum->isDependentType()) { 9334 for (unsigned i = 0; i != NumElements; ++i) { 9335 EnumConstantDecl *ECD = 9336 cast_or_null<EnumConstantDecl>(Elements[i]); 9337 if (!ECD) continue; 9338 9339 ECD->setType(EnumType); 9340 } 9341 9342 Enum->completeDefinition(Context.DependentTy, Context.DependentTy, 0, 0); 9343 return; 9344 } 9345 9346 // TODO: If the result value doesn't fit in an int, it must be a long or long 9347 // long value. ISO C does not support this, but GCC does as an extension, 9348 // emit a warning. 9349 unsigned IntWidth = Context.getTargetInfo().getIntWidth(); 9350 unsigned CharWidth = Context.getTargetInfo().getCharWidth(); 9351 unsigned ShortWidth = Context.getTargetInfo().getShortWidth(); 9352 9353 // Verify that all the values are okay, compute the size of the values, and 9354 // reverse the list. 9355 unsigned NumNegativeBits = 0; 9356 unsigned NumPositiveBits = 0; 9357 9358 // Keep track of whether all elements have type int. 9359 bool AllElementsInt = true; 9360 9361 for (unsigned i = 0; i != NumElements; ++i) { 9362 EnumConstantDecl *ECD = 9363 cast_or_null<EnumConstantDecl>(Elements[i]); 9364 if (!ECD) continue; // Already issued a diagnostic. 9365 9366 const llvm::APSInt &InitVal = ECD->getInitVal(); 9367 9368 // Keep track of the size of positive and negative values. 9369 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 9370 NumPositiveBits = std::max(NumPositiveBits, 9371 (unsigned)InitVal.getActiveBits()); 9372 else 9373 NumNegativeBits = std::max(NumNegativeBits, 9374 (unsigned)InitVal.getMinSignedBits()); 9375 9376 // Keep track of whether every enum element has type int (very commmon). 9377 if (AllElementsInt) 9378 AllElementsInt = ECD->getType() == Context.IntTy; 9379 } 9380 9381 // Figure out the type that should be used for this enum. 9382 QualType BestType; 9383 unsigned BestWidth; 9384 9385 // C++0x N3000 [conv.prom]p3: 9386 // An rvalue of an unscoped enumeration type whose underlying 9387 // type is not fixed can be converted to an rvalue of the first 9388 // of the following types that can represent all the values of 9389 // the enumeration: int, unsigned int, long int, unsigned long 9390 // int, long long int, or unsigned long long int. 9391 // C99 6.4.4.3p2: 9392 // An identifier declared as an enumeration constant has type int. 9393 // The C99 rule is modified by a gcc extension 9394 QualType BestPromotionType; 9395 9396 bool Packed = Enum->getAttr<PackedAttr>() ? true : false; 9397 // -fshort-enums is the equivalent to specifying the packed attribute on all 9398 // enum definitions. 9399 if (LangOpts.ShortEnums) 9400 Packed = true; 9401 9402 if (Enum->isFixed()) { 9403 BestType = BestPromotionType = Enum->getIntegerType(); 9404 // We don't need to set BestWidth, because BestType is going to be the type 9405 // of the enumerators, but we do anyway because otherwise some compilers 9406 // warn that it might be used uninitialized. 9407 BestWidth = CharWidth; 9408 } 9409 else if (NumNegativeBits) { 9410 // If there is a negative value, figure out the smallest integer type (of 9411 // int/long/longlong) that fits. 9412 // If it's packed, check also if it fits a char or a short. 9413 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) { 9414 BestType = Context.SignedCharTy; 9415 BestWidth = CharWidth; 9416 } else if (Packed && NumNegativeBits <= ShortWidth && 9417 NumPositiveBits < ShortWidth) { 9418 BestType = Context.ShortTy; 9419 BestWidth = ShortWidth; 9420 } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 9421 BestType = Context.IntTy; 9422 BestWidth = IntWidth; 9423 } else { 9424 BestWidth = Context.getTargetInfo().getLongWidth(); 9425 9426 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) { 9427 BestType = Context.LongTy; 9428 } else { 9429 BestWidth = Context.getTargetInfo().getLongLongWidth(); 9430 9431 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 9432 Diag(Enum->getLocation(), diag::warn_enum_too_large); 9433 BestType = Context.LongLongTy; 9434 } 9435 } 9436 BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType); 9437 } else { 9438 // If there is no negative value, figure out the smallest type that fits 9439 // all of the enumerator values. 9440 // If it's packed, check also if it fits a char or a short. 9441 if (Packed && NumPositiveBits <= CharWidth) { 9442 BestType = Context.UnsignedCharTy; 9443 BestPromotionType = Context.IntTy; 9444 BestWidth = CharWidth; 9445 } else if (Packed && NumPositiveBits <= ShortWidth) { 9446 BestType = Context.UnsignedShortTy; 9447 BestPromotionType = Context.IntTy; 9448 BestWidth = ShortWidth; 9449 } else if (NumPositiveBits <= IntWidth) { 9450 BestType = Context.UnsignedIntTy; 9451 BestWidth = IntWidth; 9452 BestPromotionType 9453 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9454 ? Context.UnsignedIntTy : Context.IntTy; 9455 } else if (NumPositiveBits <= 9456 (BestWidth = Context.getTargetInfo().getLongWidth())) { 9457 BestType = Context.UnsignedLongTy; 9458 BestPromotionType 9459 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9460 ? Context.UnsignedLongTy : Context.LongTy; 9461 } else { 9462 BestWidth = Context.getTargetInfo().getLongLongWidth(); 9463 assert(NumPositiveBits <= BestWidth && 9464 "How could an initializer get larger than ULL?"); 9465 BestType = Context.UnsignedLongLongTy; 9466 BestPromotionType 9467 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9468 ? Context.UnsignedLongLongTy : Context.LongLongTy; 9469 } 9470 } 9471 9472 // Loop over all of the enumerator constants, changing their types to match 9473 // the type of the enum if needed. 9474 for (unsigned i = 0; i != NumElements; ++i) { 9475 EnumConstantDecl *ECD = cast_or_null<EnumConstantDecl>(Elements[i]); 9476 if (!ECD) continue; // Already issued a diagnostic. 9477 9478 // Standard C says the enumerators have int type, but we allow, as an 9479 // extension, the enumerators to be larger than int size. If each 9480 // enumerator value fits in an int, type it as an int, otherwise type it the 9481 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 9482 // that X has type 'int', not 'unsigned'. 9483 9484 // Determine whether the value fits into an int. 9485 llvm::APSInt InitVal = ECD->getInitVal(); 9486 9487 // If it fits into an integer type, force it. Otherwise force it to match 9488 // the enum decl type. 9489 QualType NewTy; 9490 unsigned NewWidth; 9491 bool NewSign; 9492 if (!getLangOptions().CPlusPlus && 9493 isRepresentableIntegerValue(Context, InitVal, Context.IntTy)) { 9494 NewTy = Context.IntTy; 9495 NewWidth = IntWidth; 9496 NewSign = true; 9497 } else if (ECD->getType() == BestType) { 9498 // Already the right type! 9499 if (getLangOptions().CPlusPlus) 9500 // C++ [dcl.enum]p4: Following the closing brace of an 9501 // enum-specifier, each enumerator has the type of its 9502 // enumeration. 9503 ECD->setType(EnumType); 9504 continue; 9505 } else { 9506 NewTy = BestType; 9507 NewWidth = BestWidth; 9508 NewSign = BestType->isSignedIntegerOrEnumerationType(); 9509 } 9510 9511 // Adjust the APSInt value. 9512 InitVal = InitVal.extOrTrunc(NewWidth); 9513 InitVal.setIsSigned(NewSign); 9514 ECD->setInitVal(InitVal); 9515 9516 // Adjust the Expr initializer and type. 9517 if (ECD->getInitExpr() && 9518 !Context.hasSameType(NewTy, ECD->getInitExpr()->getType())) 9519 ECD->setInitExpr(ImplicitCastExpr::Create(Context, NewTy, 9520 CK_IntegralCast, 9521 ECD->getInitExpr(), 9522 /*base paths*/ 0, 9523 VK_RValue)); 9524 if (getLangOptions().CPlusPlus) 9525 // C++ [dcl.enum]p4: Following the closing brace of an 9526 // enum-specifier, each enumerator has the type of its 9527 // enumeration. 9528 ECD->setType(EnumType); 9529 else 9530 ECD->setType(NewTy); 9531 } 9532 9533 Enum->completeDefinition(BestType, BestPromotionType, 9534 NumPositiveBits, NumNegativeBits); 9535} 9536 9537Decl *Sema::ActOnFileScopeAsmDecl(Expr *expr, 9538 SourceLocation StartLoc, 9539 SourceLocation EndLoc) { 9540 StringLiteral *AsmString = cast<StringLiteral>(expr); 9541 9542 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext, 9543 AsmString, StartLoc, 9544 EndLoc); 9545 CurContext->addDecl(New); 9546 return New; 9547} 9548 9549DeclResult Sema::ActOnModuleImport(SourceLocation ImportLoc, 9550 IdentifierInfo &ModuleName, 9551 SourceLocation ModuleNameLoc) { 9552 ModuleKey Module = PP.getModuleLoader().loadModule(ImportLoc, 9553 ModuleName, ModuleNameLoc); 9554 if (!Module) 9555 return true; 9556 9557 // FIXME: Actually create a declaration to describe the module import. 9558 (void)Module; 9559 return DeclResult((Decl *)0); 9560} 9561 9562void 9563Sema::diagnoseModulePrivateRedeclaration(NamedDecl *New, NamedDecl *Old, 9564 SourceLocation ModulePrivateKeyword) { 9565 assert(!Old->isModulePrivate() && "Old is module-private!"); 9566 9567 Diag(New->getLocation(), diag::err_module_private_follows_public) 9568 << New->getDeclName() << SourceRange(ModulePrivateKeyword); 9569 Diag(Old->getLocation(), diag::note_previous_declaration) 9570 << Old->getDeclName(); 9571 9572 // Drop the __module_private__ from the new declaration, since it's invalid. 9573 New->setModulePrivate(false); 9574} 9575 9576void Sema::ActOnPragmaWeakID(IdentifierInfo* Name, 9577 SourceLocation PragmaLoc, 9578 SourceLocation NameLoc) { 9579 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, LookupOrdinaryName); 9580 9581 if (PrevDecl) { 9582 PrevDecl->addAttr(::new (Context) WeakAttr(PragmaLoc, Context)); 9583 } else { 9584 (void)WeakUndeclaredIdentifiers.insert( 9585 std::pair<IdentifierInfo*,WeakInfo> 9586 (Name, WeakInfo((IdentifierInfo*)0, NameLoc))); 9587 } 9588} 9589 9590void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name, 9591 IdentifierInfo* AliasName, 9592 SourceLocation PragmaLoc, 9593 SourceLocation NameLoc, 9594 SourceLocation AliasNameLoc) { 9595 Decl *PrevDecl = LookupSingleName(TUScope, AliasName, AliasNameLoc, 9596 LookupOrdinaryName); 9597 WeakInfo W = WeakInfo(Name, NameLoc); 9598 9599 if (PrevDecl) { 9600 if (!PrevDecl->hasAttr<AliasAttr>()) 9601 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl)) 9602 DeclApplyPragmaWeak(TUScope, ND, W); 9603 } else { 9604 (void)WeakUndeclaredIdentifiers.insert( 9605 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W)); 9606 } 9607} 9608 9609Decl *Sema::getObjCDeclContext() const { 9610 return (dyn_cast_or_null<ObjCContainerDecl>(CurContext)); 9611} 9612