SemaDecl.cpp revision 6b81b0d82a78740b3fb69bacf5d729b6f9374dac
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/ASTConsumer.h" 22#include "clang/AST/ASTContext.h" 23#include "clang/AST/CXXInheritance.h" 24#include "clang/AST/DeclCXX.h" 25#include "clang/AST/DeclObjC.h" 26#include "clang/AST/DeclTemplate.h" 27#include "clang/AST/EvaluatedExprVisitor.h" 28#include "clang/AST/ExprCXX.h" 29#include "clang/AST/StmtCXX.h" 30#include "clang/AST/CharUnits.h" 31#include "clang/Sema/DeclSpec.h" 32#include "clang/Sema/ParsedTemplate.h" 33#include "clang/Parse/ParseDiagnostic.h" 34#include "clang/Basic/PartialDiagnostic.h" 35#include "clang/Sema/DelayedDiagnostic.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 case TTK_Struct: return DeclSpec::TST_struct; 295 case TTK_Union: return DeclSpec::TST_union; 296 case TTK_Class: return DeclSpec::TST_class; 297 case TTK_Enum: return DeclSpec::TST_enum; 298 } 299 } 300 301 return DeclSpec::TST_unspecified; 302} 303 304/// isMicrosoftMissingTypename - In Microsoft mode, within class scope, 305/// if a CXXScopeSpec's type is equal to the type of one of the base classes 306/// then downgrade the missing typename error to a warning. 307/// This is needed for MSVC compatibility; Example: 308/// @code 309/// template<class T> class A { 310/// public: 311/// typedef int TYPE; 312/// }; 313/// template<class T> class B : public A<T> { 314/// public: 315/// A<T>::TYPE a; // no typename required because A<T> is a base class. 316/// }; 317/// @endcode 318bool Sema::isMicrosoftMissingTypename(const CXXScopeSpec *SS, Scope *S) { 319 if (CurContext->isRecord()) { 320 const Type *Ty = SS->getScopeRep()->getAsType(); 321 322 CXXRecordDecl *RD = cast<CXXRecordDecl>(CurContext); 323 for (CXXRecordDecl::base_class_const_iterator Base = RD->bases_begin(), 324 BaseEnd = RD->bases_end(); Base != BaseEnd; ++Base) 325 if (Context.hasSameUnqualifiedType(QualType(Ty, 1), Base->getType())) 326 return true; 327 return S->isFunctionPrototypeScope(); 328 } 329 return CurContext->isFunctionOrMethod() || S->isFunctionPrototypeScope(); 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, S)) 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) 419 .get(); 420 } else { 421 assert(SS && SS->isInvalid() && 422 "Invalid scope specifier has already been diagnosed"); 423 } 424 425 return true; 426} 427 428/// \brief Determine whether the given result set contains either a type name 429/// or 430static bool isResultTypeOrTemplate(LookupResult &R, const Token &NextToken) { 431 bool CheckTemplate = R.getSema().getLangOptions().CPlusPlus && 432 NextToken.is(tok::less); 433 434 for (LookupResult::iterator I = R.begin(), IEnd = R.end(); I != IEnd; ++I) { 435 if (isa<TypeDecl>(*I) || isa<ObjCInterfaceDecl>(*I)) 436 return true; 437 438 if (CheckTemplate && isa<TemplateDecl>(*I)) 439 return true; 440 } 441 442 return false; 443} 444 445Sema::NameClassification Sema::ClassifyName(Scope *S, 446 CXXScopeSpec &SS, 447 IdentifierInfo *&Name, 448 SourceLocation NameLoc, 449 const Token &NextToken) { 450 DeclarationNameInfo NameInfo(Name, NameLoc); 451 ObjCMethodDecl *CurMethod = getCurMethodDecl(); 452 453 if (NextToken.is(tok::coloncolon)) { 454 BuildCXXNestedNameSpecifier(S, *Name, NameLoc, NextToken.getLocation(), 455 QualType(), false, SS, 0, false); 456 457 } 458 459 LookupResult Result(*this, Name, NameLoc, LookupOrdinaryName); 460 LookupParsedName(Result, S, &SS, !CurMethod); 461 462 // Perform lookup for Objective-C instance variables (including automatically 463 // synthesized instance variables), if we're in an Objective-C method. 464 // FIXME: This lookup really, really needs to be folded in to the normal 465 // unqualified lookup mechanism. 466 if (!SS.isSet() && CurMethod && !isResultTypeOrTemplate(Result, NextToken)) { 467 ExprResult E = LookupInObjCMethod(Result, S, Name, true); 468 if (E.get() || E.isInvalid()) 469 return E; 470 } 471 472 bool SecondTry = false; 473 bool IsFilteredTemplateName = false; 474 475Corrected: 476 switch (Result.getResultKind()) { 477 case LookupResult::NotFound: 478 // If an unqualified-id is followed by a '(', then we have a function 479 // call. 480 if (!SS.isSet() && NextToken.is(tok::l_paren)) { 481 // In C++, this is an ADL-only call. 482 // FIXME: Reference? 483 if (getLangOptions().CPlusPlus) 484 return BuildDeclarationNameExpr(SS, Result, /*ADL=*/true); 485 486 // C90 6.3.2.2: 487 // If the expression that precedes the parenthesized argument list in a 488 // function call consists solely of an identifier, and if no 489 // declaration is visible for this identifier, the identifier is 490 // implicitly declared exactly as if, in the innermost block containing 491 // the function call, the declaration 492 // 493 // extern int identifier (); 494 // 495 // appeared. 496 // 497 // We also allow this in C99 as an extension. 498 if (NamedDecl *D = ImplicitlyDefineFunction(NameLoc, *Name, S)) { 499 Result.addDecl(D); 500 Result.resolveKind(); 501 return BuildDeclarationNameExpr(SS, Result, /*ADL=*/false); 502 } 503 } 504 505 // In C, we first see whether there is a tag type by the same name, in 506 // which case it's likely that the user just forget to write "enum", 507 // "struct", or "union". 508 if (!getLangOptions().CPlusPlus && !SecondTry) { 509 Result.clear(LookupTagName); 510 LookupParsedName(Result, S, &SS); 511 if (TagDecl *Tag = Result.getAsSingle<TagDecl>()) { 512 const char *TagName = 0; 513 const char *FixItTagName = 0; 514 switch (Tag->getTagKind()) { 515 case TTK_Class: 516 TagName = "class"; 517 FixItTagName = "class "; 518 break; 519 520 case TTK_Enum: 521 TagName = "enum"; 522 FixItTagName = "enum "; 523 break; 524 525 case TTK_Struct: 526 TagName = "struct"; 527 FixItTagName = "struct "; 528 break; 529 530 case TTK_Union: 531 TagName = "union"; 532 FixItTagName = "union "; 533 break; 534 } 535 536 Diag(NameLoc, diag::err_use_of_tag_name_without_tag) 537 << Name << TagName << getLangOptions().CPlusPlus 538 << FixItHint::CreateInsertion(NameLoc, FixItTagName); 539 break; 540 } 541 542 Result.clear(LookupOrdinaryName); 543 } 544 545 // Perform typo correction to determine if there is another name that is 546 // close to this name. 547 if (!SecondTry) { 548 SecondTry = true; 549 if (TypoCorrection Corrected = CorrectTypo(Result.getLookupNameInfo(), 550 Result.getLookupKind(), S, 551 &SS)) { 552 unsigned UnqualifiedDiag = diag::err_undeclared_var_use_suggest; 553 unsigned QualifiedDiag = diag::err_no_member_suggest; 554 std::string CorrectedStr(Corrected.getAsString(getLangOptions())); 555 std::string CorrectedQuotedStr(Corrected.getQuoted(getLangOptions())); 556 557 NamedDecl *FirstDecl = Corrected.getCorrectionDecl(); 558 NamedDecl *UnderlyingFirstDecl 559 = FirstDecl? FirstDecl->getUnderlyingDecl() : 0; 560 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) && 561 UnderlyingFirstDecl && isa<TemplateDecl>(UnderlyingFirstDecl)) { 562 UnqualifiedDiag = diag::err_no_template_suggest; 563 QualifiedDiag = diag::err_no_member_template_suggest; 564 } else if (UnderlyingFirstDecl && 565 (isa<TypeDecl>(UnderlyingFirstDecl) || 566 isa<ObjCInterfaceDecl>(UnderlyingFirstDecl) || 567 isa<ObjCCompatibleAliasDecl>(UnderlyingFirstDecl))) { 568 UnqualifiedDiag = diag::err_unknown_typename_suggest; 569 QualifiedDiag = diag::err_unknown_nested_typename_suggest; 570 } 571 572 if (SS.isEmpty()) 573 Diag(NameLoc, UnqualifiedDiag) 574 << Name << CorrectedQuotedStr 575 << FixItHint::CreateReplacement(NameLoc, CorrectedStr); 576 else 577 Diag(NameLoc, QualifiedDiag) 578 << Name << computeDeclContext(SS, false) << CorrectedQuotedStr 579 << SS.getRange() 580 << FixItHint::CreateReplacement(NameLoc, CorrectedStr); 581 582 // Update the name, so that the caller has the new name. 583 Name = Corrected.getCorrectionAsIdentifierInfo(); 584 585 // Also update the LookupResult... 586 // FIXME: This should probably go away at some point 587 Result.clear(); 588 Result.setLookupName(Corrected.getCorrection()); 589 if (FirstDecl) Result.addDecl(FirstDecl); 590 591 // Typo correction corrected to a keyword. 592 if (Corrected.isKeyword()) 593 return Corrected.getCorrectionAsIdentifierInfo(); 594 595 if (FirstDecl) 596 Diag(FirstDecl->getLocation(), diag::note_previous_decl) 597 << CorrectedQuotedStr; 598 599 // If we found an Objective-C instance variable, let 600 // LookupInObjCMethod build the appropriate expression to 601 // reference the ivar. 602 // FIXME: This is a gross hack. 603 if (ObjCIvarDecl *Ivar = Result.getAsSingle<ObjCIvarDecl>()) { 604 Result.clear(); 605 ExprResult E(LookupInObjCMethod(Result, S, Ivar->getIdentifier())); 606 return move(E); 607 } 608 609 goto Corrected; 610 } 611 } 612 613 // We failed to correct; just fall through and let the parser deal with it. 614 Result.suppressDiagnostics(); 615 return NameClassification::Unknown(); 616 617 case LookupResult::NotFoundInCurrentInstantiation: 618 // We performed name lookup into the current instantiation, and there were 619 // dependent bases, so we treat this result the same way as any other 620 // dependent nested-name-specifier. 621 622 // C++ [temp.res]p2: 623 // A name used in a template declaration or definition and that is 624 // dependent on a template-parameter is assumed not to name a type 625 // unless the applicable name lookup finds a type name or the name is 626 // qualified by the keyword typename. 627 // 628 // FIXME: If the next token is '<', we might want to ask the parser to 629 // perform some heroics to see if we actually have a 630 // template-argument-list, which would indicate a missing 'template' 631 // keyword here. 632 return BuildDependentDeclRefExpr(SS, NameInfo, /*TemplateArgs=*/0); 633 634 case LookupResult::Found: 635 case LookupResult::FoundOverloaded: 636 case LookupResult::FoundUnresolvedValue: 637 break; 638 639 case LookupResult::Ambiguous: 640 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) && 641 hasAnyAcceptableTemplateNames(Result)) { 642 // C++ [temp.local]p3: 643 // A lookup that finds an injected-class-name (10.2) can result in an 644 // ambiguity in certain cases (for example, if it is found in more than 645 // one base class). If all of the injected-class-names that are found 646 // refer to specializations of the same class template, and if the name 647 // is followed by a template-argument-list, the reference refers to the 648 // class template itself and not a specialization thereof, and is not 649 // ambiguous. 650 // 651 // This filtering can make an ambiguous result into an unambiguous one, 652 // so try again after filtering out template names. 653 FilterAcceptableTemplateNames(Result); 654 if (!Result.isAmbiguous()) { 655 IsFilteredTemplateName = true; 656 break; 657 } 658 } 659 660 // Diagnose the ambiguity and return an error. 661 return NameClassification::Error(); 662 } 663 664 if (getLangOptions().CPlusPlus && NextToken.is(tok::less) && 665 (IsFilteredTemplateName || hasAnyAcceptableTemplateNames(Result))) { 666 // C++ [temp.names]p3: 667 // After name lookup (3.4) finds that a name is a template-name or that 668 // an operator-function-id or a literal- operator-id refers to a set of 669 // overloaded functions any member of which is a function template if 670 // this is followed by a <, the < is always taken as the delimiter of a 671 // template-argument-list and never as the less-than operator. 672 if (!IsFilteredTemplateName) 673 FilterAcceptableTemplateNames(Result); 674 675 if (!Result.empty()) { 676 bool IsFunctionTemplate; 677 TemplateName Template; 678 if (Result.end() - Result.begin() > 1) { 679 IsFunctionTemplate = true; 680 Template = Context.getOverloadedTemplateName(Result.begin(), 681 Result.end()); 682 } else { 683 TemplateDecl *TD 684 = cast<TemplateDecl>((*Result.begin())->getUnderlyingDecl()); 685 IsFunctionTemplate = isa<FunctionTemplateDecl>(TD); 686 687 if (SS.isSet() && !SS.isInvalid()) 688 Template = Context.getQualifiedTemplateName(SS.getScopeRep(), 689 /*TemplateKeyword=*/false, 690 TD); 691 else 692 Template = TemplateName(TD); 693 } 694 695 if (IsFunctionTemplate) { 696 // Function templates always go through overload resolution, at which 697 // point we'll perform the various checks (e.g., accessibility) we need 698 // to based on which function we selected. 699 Result.suppressDiagnostics(); 700 701 return NameClassification::FunctionTemplate(Template); 702 } 703 704 return NameClassification::TypeTemplate(Template); 705 } 706 } 707 708 NamedDecl *FirstDecl = (*Result.begin())->getUnderlyingDecl(); 709 if (TypeDecl *Type = dyn_cast<TypeDecl>(FirstDecl)) { 710 DiagnoseUseOfDecl(Type, NameLoc); 711 QualType T = Context.getTypeDeclType(Type); 712 return ParsedType::make(T); 713 } 714 715 ObjCInterfaceDecl *Class = dyn_cast<ObjCInterfaceDecl>(FirstDecl); 716 if (!Class) { 717 // FIXME: It's unfortunate that we don't have a Type node for handling this. 718 if (ObjCCompatibleAliasDecl *Alias 719 = dyn_cast<ObjCCompatibleAliasDecl>(FirstDecl)) 720 Class = Alias->getClassInterface(); 721 } 722 723 if (Class) { 724 DiagnoseUseOfDecl(Class, NameLoc); 725 726 if (NextToken.is(tok::period)) { 727 // Interface. <something> is parsed as a property reference expression. 728 // Just return "unknown" as a fall-through for now. 729 Result.suppressDiagnostics(); 730 return NameClassification::Unknown(); 731 } 732 733 QualType T = Context.getObjCInterfaceType(Class); 734 return ParsedType::make(T); 735 } 736 737 if (!Result.empty() && (*Result.begin())->isCXXClassMember()) 738 return BuildPossibleImplicitMemberExpr(SS, Result, 0); 739 740 bool ADL = UseArgumentDependentLookup(SS, Result, NextToken.is(tok::l_paren)); 741 return BuildDeclarationNameExpr(SS, Result, ADL); 742} 743 744// Determines the context to return to after temporarily entering a 745// context. This depends in an unnecessarily complicated way on the 746// exact ordering of callbacks from the parser. 747DeclContext *Sema::getContainingDC(DeclContext *DC) { 748 749 // Functions defined inline within classes aren't parsed until we've 750 // finished parsing the top-level class, so the top-level class is 751 // the context we'll need to return to. 752 if (isa<FunctionDecl>(DC)) { 753 DC = DC->getLexicalParent(); 754 755 // A function not defined within a class will always return to its 756 // lexical context. 757 if (!isa<CXXRecordDecl>(DC)) 758 return DC; 759 760 // A C++ inline method/friend is parsed *after* the topmost class 761 // it was declared in is fully parsed ("complete"); the topmost 762 // class is the context we need to return to. 763 while (CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC->getLexicalParent())) 764 DC = RD; 765 766 // Return the declaration context of the topmost class the inline method is 767 // declared in. 768 return DC; 769 } 770 771 return DC->getLexicalParent(); 772} 773 774void Sema::PushDeclContext(Scope *S, DeclContext *DC) { 775 assert(getContainingDC(DC) == CurContext && 776 "The next DeclContext should be lexically contained in the current one."); 777 CurContext = DC; 778 S->setEntity(DC); 779} 780 781void Sema::PopDeclContext() { 782 assert(CurContext && "DeclContext imbalance!"); 783 784 CurContext = getContainingDC(CurContext); 785 assert(CurContext && "Popped translation unit!"); 786} 787 788/// EnterDeclaratorContext - Used when we must lookup names in the context 789/// of a declarator's nested name specifier. 790/// 791void Sema::EnterDeclaratorContext(Scope *S, DeclContext *DC) { 792 // C++0x [basic.lookup.unqual]p13: 793 // A name used in the definition of a static data member of class 794 // X (after the qualified-id of the static member) is looked up as 795 // if the name was used in a member function of X. 796 // C++0x [basic.lookup.unqual]p14: 797 // If a variable member of a namespace is defined outside of the 798 // scope of its namespace then any name used in the definition of 799 // the variable member (after the declarator-id) is looked up as 800 // if the definition of the variable member occurred in its 801 // namespace. 802 // Both of these imply that we should push a scope whose context 803 // is the semantic context of the declaration. We can't use 804 // PushDeclContext here because that context is not necessarily 805 // lexically contained in the current context. Fortunately, 806 // the containing scope should have the appropriate information. 807 808 assert(!S->getEntity() && "scope already has entity"); 809 810#ifndef NDEBUG 811 Scope *Ancestor = S->getParent(); 812 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 813 assert(Ancestor->getEntity() == CurContext && "ancestor context mismatch"); 814#endif 815 816 CurContext = DC; 817 S->setEntity(DC); 818} 819 820void Sema::ExitDeclaratorContext(Scope *S) { 821 assert(S->getEntity() == CurContext && "Context imbalance!"); 822 823 // Switch back to the lexical context. The safety of this is 824 // enforced by an assert in EnterDeclaratorContext. 825 Scope *Ancestor = S->getParent(); 826 while (!Ancestor->getEntity()) Ancestor = Ancestor->getParent(); 827 CurContext = (DeclContext*) Ancestor->getEntity(); 828 829 // We don't need to do anything with the scope, which is going to 830 // disappear. 831} 832 833 834void Sema::ActOnReenterFunctionContext(Scope* S, Decl *D) { 835 FunctionDecl *FD = dyn_cast<FunctionDecl>(D); 836 if (FunctionTemplateDecl *TFD = dyn_cast_or_null<FunctionTemplateDecl>(D)) { 837 // We assume that the caller has already called 838 // ActOnReenterTemplateScope 839 FD = TFD->getTemplatedDecl(); 840 } 841 if (!FD) 842 return; 843 844 PushDeclContext(S, FD); 845 for (unsigned P = 0, NumParams = FD->getNumParams(); P < NumParams; ++P) { 846 ParmVarDecl *Param = FD->getParamDecl(P); 847 // If the parameter has an identifier, then add it to the scope 848 if (Param->getIdentifier()) { 849 S->AddDecl(Param); 850 IdResolver.AddDecl(Param); 851 } 852 } 853} 854 855 856/// \brief Determine whether we allow overloading of the function 857/// PrevDecl with another declaration. 858/// 859/// This routine determines whether overloading is possible, not 860/// whether some new function is actually an overload. It will return 861/// true in C++ (where we can always provide overloads) or, as an 862/// extension, in C when the previous function is already an 863/// overloaded function declaration or has the "overloadable" 864/// attribute. 865static bool AllowOverloadingOfFunction(LookupResult &Previous, 866 ASTContext &Context) { 867 if (Context.getLangOptions().CPlusPlus) 868 return true; 869 870 if (Previous.getResultKind() == LookupResult::FoundOverloaded) 871 return true; 872 873 return (Previous.getResultKind() == LookupResult::Found 874 && Previous.getFoundDecl()->hasAttr<OverloadableAttr>()); 875} 876 877/// Add this decl to the scope shadowed decl chains. 878void Sema::PushOnScopeChains(NamedDecl *D, Scope *S, bool AddToContext) { 879 // Move up the scope chain until we find the nearest enclosing 880 // non-transparent context. The declaration will be introduced into this 881 // scope. 882 while (S->getEntity() && 883 ((DeclContext *)S->getEntity())->isTransparentContext()) 884 S = S->getParent(); 885 886 // Add scoped declarations into their context, so that they can be 887 // found later. Declarations without a context won't be inserted 888 // into any context. 889 if (AddToContext) 890 CurContext->addDecl(D); 891 892 // Out-of-line definitions shouldn't be pushed into scope in C++. 893 // Out-of-line variable and function definitions shouldn't even in C. 894 if ((getLangOptions().CPlusPlus || isa<VarDecl>(D) || isa<FunctionDecl>(D)) && 895 D->isOutOfLine() && 896 !D->getDeclContext()->getRedeclContext()->Equals( 897 D->getLexicalDeclContext()->getRedeclContext())) 898 return; 899 900 // Template instantiations should also not be pushed into scope. 901 if (isa<FunctionDecl>(D) && 902 cast<FunctionDecl>(D)->isFunctionTemplateSpecialization()) 903 return; 904 905 // If this replaces anything in the current scope, 906 IdentifierResolver::iterator I = IdResolver.begin(D->getDeclName()), 907 IEnd = IdResolver.end(); 908 for (; I != IEnd; ++I) { 909 if (S->isDeclScope(*I) && D->declarationReplaces(*I)) { 910 S->RemoveDecl(*I); 911 IdResolver.RemoveDecl(*I); 912 913 // Should only need to replace one decl. 914 break; 915 } 916 } 917 918 S->AddDecl(D); 919 920 if (isa<LabelDecl>(D) && !cast<LabelDecl>(D)->isGnuLocal()) { 921 // Implicitly-generated labels may end up getting generated in an order that 922 // isn't strictly lexical, which breaks name lookup. Be careful to insert 923 // the label at the appropriate place in the identifier chain. 924 for (I = IdResolver.begin(D->getDeclName()); I != IEnd; ++I) { 925 DeclContext *IDC = (*I)->getLexicalDeclContext()->getRedeclContext(); 926 if (IDC == CurContext) { 927 if (!S->isDeclScope(*I)) 928 continue; 929 } else if (IDC->Encloses(CurContext)) 930 break; 931 } 932 933 IdResolver.InsertDeclAfter(I, D); 934 } else { 935 IdResolver.AddDecl(D); 936 } 937} 938 939void Sema::pushExternalDeclIntoScope(NamedDecl *D, DeclarationName Name) { 940 if (IdResolver.tryAddTopLevelDecl(D, Name) && TUScope) 941 TUScope->AddDecl(D); 942} 943 944bool Sema::isDeclInScope(NamedDecl *&D, DeclContext *Ctx, Scope *S, 945 bool ExplicitInstantiationOrSpecialization) { 946 return IdResolver.isDeclInScope(D, Ctx, Context, S, 947 ExplicitInstantiationOrSpecialization); 948} 949 950Scope *Sema::getScopeForDeclContext(Scope *S, DeclContext *DC) { 951 DeclContext *TargetDC = DC->getPrimaryContext(); 952 do { 953 if (DeclContext *ScopeDC = (DeclContext*) S->getEntity()) 954 if (ScopeDC->getPrimaryContext() == TargetDC) 955 return S; 956 } while ((S = S->getParent())); 957 958 return 0; 959} 960 961static bool isOutOfScopePreviousDeclaration(NamedDecl *, 962 DeclContext*, 963 ASTContext&); 964 965/// Filters out lookup results that don't fall within the given scope 966/// as determined by isDeclInScope. 967void Sema::FilterLookupForScope(LookupResult &R, 968 DeclContext *Ctx, Scope *S, 969 bool ConsiderLinkage, 970 bool ExplicitInstantiationOrSpecialization) { 971 LookupResult::Filter F = R.makeFilter(); 972 while (F.hasNext()) { 973 NamedDecl *D = F.next(); 974 975 if (isDeclInScope(D, Ctx, S, ExplicitInstantiationOrSpecialization)) 976 continue; 977 978 if (ConsiderLinkage && 979 isOutOfScopePreviousDeclaration(D, Ctx, Context)) 980 continue; 981 982 F.erase(); 983 } 984 985 F.done(); 986} 987 988static bool isUsingDecl(NamedDecl *D) { 989 return isa<UsingShadowDecl>(D) || 990 isa<UnresolvedUsingTypenameDecl>(D) || 991 isa<UnresolvedUsingValueDecl>(D); 992} 993 994/// Removes using shadow declarations from the lookup results. 995static void RemoveUsingDecls(LookupResult &R) { 996 LookupResult::Filter F = R.makeFilter(); 997 while (F.hasNext()) 998 if (isUsingDecl(F.next())) 999 F.erase(); 1000 1001 F.done(); 1002} 1003 1004/// \brief Check for this common pattern: 1005/// @code 1006/// class S { 1007/// S(const S&); // DO NOT IMPLEMENT 1008/// void operator=(const S&); // DO NOT IMPLEMENT 1009/// }; 1010/// @endcode 1011static bool IsDisallowedCopyOrAssign(const CXXMethodDecl *D) { 1012 // FIXME: Should check for private access too but access is set after we get 1013 // the decl here. 1014 if (D->doesThisDeclarationHaveABody()) 1015 return false; 1016 1017 if (const CXXConstructorDecl *CD = dyn_cast<CXXConstructorDecl>(D)) 1018 return CD->isCopyConstructor(); 1019 if (const CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(D)) 1020 return Method->isCopyAssignmentOperator(); 1021 return false; 1022} 1023 1024bool Sema::ShouldWarnIfUnusedFileScopedDecl(const DeclaratorDecl *D) const { 1025 assert(D); 1026 1027 if (D->isInvalidDecl() || D->isUsed() || D->hasAttr<UnusedAttr>()) 1028 return false; 1029 1030 // Ignore class templates. 1031 if (D->getDeclContext()->isDependentContext() || 1032 D->getLexicalDeclContext()->isDependentContext()) 1033 return false; 1034 1035 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 1036 if (FD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 1037 return false; 1038 1039 if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) { 1040 if (MD->isVirtual() || IsDisallowedCopyOrAssign(MD)) 1041 return false; 1042 } else { 1043 // 'static inline' functions are used in headers; don't warn. 1044 if (FD->getStorageClass() == SC_Static && 1045 FD->isInlineSpecified()) 1046 return false; 1047 } 1048 1049 if (FD->doesThisDeclarationHaveABody() && 1050 Context.DeclMustBeEmitted(FD)) 1051 return false; 1052 } else if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1053 if (!VD->isFileVarDecl() || 1054 VD->getType().isConstant(Context) || 1055 Context.DeclMustBeEmitted(VD)) 1056 return false; 1057 1058 if (VD->isStaticDataMember() && 1059 VD->getTemplateSpecializationKind() == TSK_ImplicitInstantiation) 1060 return false; 1061 1062 } else { 1063 return false; 1064 } 1065 1066 // Only warn for unused decls internal to the translation unit. 1067 if (D->getLinkage() == ExternalLinkage) 1068 return false; 1069 1070 return true; 1071} 1072 1073void Sema::MarkUnusedFileScopedDecl(const DeclaratorDecl *D) { 1074 if (!D) 1075 return; 1076 1077 if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(D)) { 1078 const FunctionDecl *First = FD->getFirstDeclaration(); 1079 if (FD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 1080 return; // First should already be in the vector. 1081 } 1082 1083 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1084 const VarDecl *First = VD->getFirstDeclaration(); 1085 if (VD != First && ShouldWarnIfUnusedFileScopedDecl(First)) 1086 return; // First should already be in the vector. 1087 } 1088 1089 if (ShouldWarnIfUnusedFileScopedDecl(D)) 1090 UnusedFileScopedDecls.push_back(D); 1091 } 1092 1093static bool ShouldDiagnoseUnusedDecl(const NamedDecl *D) { 1094 if (D->isInvalidDecl()) 1095 return false; 1096 1097 if (D->isReferenced() || D->isUsed() || D->hasAttr<UnusedAttr>()) 1098 return false; 1099 1100 if (isa<LabelDecl>(D)) 1101 return true; 1102 1103 // White-list anything that isn't a local variable. 1104 if (!isa<VarDecl>(D) || isa<ParmVarDecl>(D) || isa<ImplicitParamDecl>(D) || 1105 !D->getDeclContext()->isFunctionOrMethod()) 1106 return false; 1107 1108 // Types of valid local variables should be complete, so this should succeed. 1109 if (const VarDecl *VD = dyn_cast<VarDecl>(D)) { 1110 1111 // White-list anything with an __attribute__((unused)) type. 1112 QualType Ty = VD->getType(); 1113 1114 // Only look at the outermost level of typedef. 1115 if (const TypedefType *TT = dyn_cast<TypedefType>(Ty)) { 1116 if (TT->getDecl()->hasAttr<UnusedAttr>()) 1117 return false; 1118 } 1119 1120 // If we failed to complete the type for some reason, or if the type is 1121 // dependent, don't diagnose the variable. 1122 if (Ty->isIncompleteType() || Ty->isDependentType()) 1123 return false; 1124 1125 if (const TagType *TT = Ty->getAs<TagType>()) { 1126 const TagDecl *Tag = TT->getDecl(); 1127 if (Tag->hasAttr<UnusedAttr>()) 1128 return false; 1129 1130 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(Tag)) { 1131 if (!RD->hasTrivialDestructor()) 1132 return false; 1133 1134 if (const Expr *Init = VD->getInit()) { 1135 const CXXConstructExpr *Construct = 1136 dyn_cast<CXXConstructExpr>(Init); 1137 if (Construct && !Construct->isElidable()) { 1138 CXXConstructorDecl *CD = Construct->getConstructor(); 1139 if (!CD->isTrivial()) 1140 return false; 1141 } 1142 } 1143 } 1144 } 1145 1146 // TODO: __attribute__((unused)) templates? 1147 } 1148 1149 return true; 1150} 1151 1152static void GenerateFixForUnusedDecl(const NamedDecl *D, ASTContext &Ctx, 1153 FixItHint &Hint) { 1154 if (isa<LabelDecl>(D)) { 1155 SourceLocation AfterColon = Lexer::findLocationAfterToken(D->getLocEnd(), 1156 tok::colon, Ctx.getSourceManager(), Ctx.getLangOptions(), true); 1157 if (AfterColon.isInvalid()) 1158 return; 1159 Hint = FixItHint::CreateRemoval(CharSourceRange:: 1160 getCharRange(D->getLocStart(), AfterColon)); 1161 } 1162 return; 1163} 1164 1165/// DiagnoseUnusedDecl - Emit warnings about declarations that are not used 1166/// unless they are marked attr(unused). 1167void Sema::DiagnoseUnusedDecl(const NamedDecl *D) { 1168 FixItHint Hint; 1169 if (!ShouldDiagnoseUnusedDecl(D)) 1170 return; 1171 1172 GenerateFixForUnusedDecl(D, Context, Hint); 1173 1174 unsigned DiagID; 1175 if (isa<VarDecl>(D) && cast<VarDecl>(D)->isExceptionVariable()) 1176 DiagID = diag::warn_unused_exception_param; 1177 else if (isa<LabelDecl>(D)) 1178 DiagID = diag::warn_unused_label; 1179 else 1180 DiagID = diag::warn_unused_variable; 1181 1182 Diag(D->getLocation(), DiagID) << D->getDeclName() << Hint; 1183} 1184 1185static void CheckPoppedLabel(LabelDecl *L, Sema &S) { 1186 // Verify that we have no forward references left. If so, there was a goto 1187 // or address of a label taken, but no definition of it. Label fwd 1188 // definitions are indicated with a null substmt. 1189 if (L->getStmt() == 0) 1190 S.Diag(L->getLocation(), diag::err_undeclared_label_use) <<L->getDeclName(); 1191} 1192 1193void Sema::ActOnPopScope(SourceLocation Loc, Scope *S) { 1194 if (S->decl_empty()) return; 1195 assert((S->getFlags() & (Scope::DeclScope | Scope::TemplateParamScope)) && 1196 "Scope shouldn't contain decls!"); 1197 1198 for (Scope::decl_iterator I = S->decl_begin(), E = S->decl_end(); 1199 I != E; ++I) { 1200 Decl *TmpD = (*I); 1201 assert(TmpD && "This decl didn't get pushed??"); 1202 1203 assert(isa<NamedDecl>(TmpD) && "Decl isn't NamedDecl?"); 1204 NamedDecl *D = cast<NamedDecl>(TmpD); 1205 1206 if (!D->getDeclName()) continue; 1207 1208 // Diagnose unused variables in this scope. 1209 if (!S->hasErrorOccurred()) 1210 DiagnoseUnusedDecl(D); 1211 1212 // If this was a forward reference to a label, verify it was defined. 1213 if (LabelDecl *LD = dyn_cast<LabelDecl>(D)) 1214 CheckPoppedLabel(LD, *this); 1215 1216 // Remove this name from our lexical scope. 1217 IdResolver.RemoveDecl(D); 1218 } 1219} 1220 1221/// \brief Look for an Objective-C class in the translation unit. 1222/// 1223/// \param Id The name of the Objective-C class we're looking for. If 1224/// typo-correction fixes this name, the Id will be updated 1225/// to the fixed name. 1226/// 1227/// \param IdLoc The location of the name in the translation unit. 1228/// 1229/// \param TypoCorrection If true, this routine will attempt typo correction 1230/// if there is no class with the given name. 1231/// 1232/// \returns The declaration of the named Objective-C class, or NULL if the 1233/// class could not be found. 1234ObjCInterfaceDecl *Sema::getObjCInterfaceDecl(IdentifierInfo *&Id, 1235 SourceLocation IdLoc, 1236 bool DoTypoCorrection) { 1237 // The third "scope" argument is 0 since we aren't enabling lazy built-in 1238 // creation from this context. 1239 NamedDecl *IDecl = LookupSingleName(TUScope, Id, IdLoc, LookupOrdinaryName); 1240 1241 if (!IDecl && DoTypoCorrection) { 1242 // Perform typo correction at the given location, but only if we 1243 // find an Objective-C class name. 1244 TypoCorrection C; 1245 if ((C = CorrectTypo(DeclarationNameInfo(Id, IdLoc), LookupOrdinaryName, 1246 TUScope, NULL, NULL, false, CTC_NoKeywords)) && 1247 (IDecl = C.getCorrectionDeclAs<ObjCInterfaceDecl>())) { 1248 Diag(IdLoc, diag::err_undef_interface_suggest) 1249 << Id << IDecl->getDeclName() 1250 << FixItHint::CreateReplacement(IdLoc, IDecl->getNameAsString()); 1251 Diag(IDecl->getLocation(), diag::note_previous_decl) 1252 << IDecl->getDeclName(); 1253 1254 Id = IDecl->getIdentifier(); 1255 } 1256 } 1257 ObjCInterfaceDecl *Def = dyn_cast_or_null<ObjCInterfaceDecl>(IDecl); 1258 // This routine must always return a class definition, if any. 1259 if (Def && Def->getDefinition()) 1260 Def = Def->getDefinition(); 1261 return Def; 1262} 1263 1264/// getNonFieldDeclScope - Retrieves the innermost scope, starting 1265/// from S, where a non-field would be declared. This routine copes 1266/// with the difference between C and C++ scoping rules in structs and 1267/// unions. For example, the following code is well-formed in C but 1268/// ill-formed in C++: 1269/// @code 1270/// struct S6 { 1271/// enum { BAR } e; 1272/// }; 1273/// 1274/// void test_S6() { 1275/// struct S6 a; 1276/// a.e = BAR; 1277/// } 1278/// @endcode 1279/// For the declaration of BAR, this routine will return a different 1280/// scope. The scope S will be the scope of the unnamed enumeration 1281/// within S6. In C++, this routine will return the scope associated 1282/// with S6, because the enumeration's scope is a transparent 1283/// context but structures can contain non-field names. In C, this 1284/// routine will return the translation unit scope, since the 1285/// enumeration's scope is a transparent context and structures cannot 1286/// contain non-field names. 1287Scope *Sema::getNonFieldDeclScope(Scope *S) { 1288 while (((S->getFlags() & Scope::DeclScope) == 0) || 1289 (S->getEntity() && 1290 ((DeclContext *)S->getEntity())->isTransparentContext()) || 1291 (S->isClassScope() && !getLangOptions().CPlusPlus)) 1292 S = S->getParent(); 1293 return S; 1294} 1295 1296/// LazilyCreateBuiltin - The specified Builtin-ID was first used at 1297/// file scope. lazily create a decl for it. ForRedeclaration is true 1298/// if we're creating this built-in in anticipation of redeclaring the 1299/// built-in. 1300NamedDecl *Sema::LazilyCreateBuiltin(IdentifierInfo *II, unsigned bid, 1301 Scope *S, bool ForRedeclaration, 1302 SourceLocation Loc) { 1303 Builtin::ID BID = (Builtin::ID)bid; 1304 1305 ASTContext::GetBuiltinTypeError Error; 1306 QualType R = Context.GetBuiltinType(BID, Error); 1307 switch (Error) { 1308 case ASTContext::GE_None: 1309 // Okay 1310 break; 1311 1312 case ASTContext::GE_Missing_stdio: 1313 if (ForRedeclaration) 1314 Diag(Loc, diag::warn_implicit_decl_requires_stdio) 1315 << Context.BuiltinInfo.GetName(BID); 1316 return 0; 1317 1318 case ASTContext::GE_Missing_setjmp: 1319 if (ForRedeclaration) 1320 Diag(Loc, diag::warn_implicit_decl_requires_setjmp) 1321 << Context.BuiltinInfo.GetName(BID); 1322 return 0; 1323 1324 case ASTContext::GE_Missing_ucontext: 1325 if (ForRedeclaration) 1326 Diag(Loc, diag::warn_implicit_decl_requires_ucontext) 1327 << Context.BuiltinInfo.GetName(BID); 1328 return 0; 1329 } 1330 1331 if (!ForRedeclaration && Context.BuiltinInfo.isPredefinedLibFunction(BID)) { 1332 Diag(Loc, diag::ext_implicit_lib_function_decl) 1333 << Context.BuiltinInfo.GetName(BID) 1334 << R; 1335 if (Context.BuiltinInfo.getHeaderName(BID) && 1336 Diags.getDiagnosticLevel(diag::ext_implicit_lib_function_decl, Loc) 1337 != DiagnosticsEngine::Ignored) 1338 Diag(Loc, diag::note_please_include_header) 1339 << Context.BuiltinInfo.getHeaderName(BID) 1340 << Context.BuiltinInfo.GetName(BID); 1341 } 1342 1343 FunctionDecl *New = FunctionDecl::Create(Context, 1344 Context.getTranslationUnitDecl(), 1345 Loc, Loc, II, R, /*TInfo=*/0, 1346 SC_Extern, 1347 SC_None, false, 1348 /*hasPrototype=*/true); 1349 New->setImplicit(); 1350 1351 // Create Decl objects for each parameter, adding them to the 1352 // FunctionDecl. 1353 if (const FunctionProtoType *FT = dyn_cast<FunctionProtoType>(R)) { 1354 SmallVector<ParmVarDecl*, 16> Params; 1355 for (unsigned i = 0, e = FT->getNumArgs(); i != e; ++i) { 1356 ParmVarDecl *parm = 1357 ParmVarDecl::Create(Context, New, SourceLocation(), 1358 SourceLocation(), 0, 1359 FT->getArgType(i), /*TInfo=*/0, 1360 SC_None, SC_None, 0); 1361 parm->setScopeInfo(0, i); 1362 Params.push_back(parm); 1363 } 1364 New->setParams(Params); 1365 } 1366 1367 AddKnownFunctionAttributes(New); 1368 1369 // TUScope is the translation-unit scope to insert this function into. 1370 // FIXME: This is hideous. We need to teach PushOnScopeChains to 1371 // relate Scopes to DeclContexts, and probably eliminate CurContext 1372 // entirely, but we're not there yet. 1373 DeclContext *SavedContext = CurContext; 1374 CurContext = Context.getTranslationUnitDecl(); 1375 PushOnScopeChains(New, TUScope); 1376 CurContext = SavedContext; 1377 return New; 1378} 1379 1380bool Sema::isIncompatibleTypedef(TypeDecl *Old, TypedefNameDecl *New) { 1381 QualType OldType; 1382 if (TypedefNameDecl *OldTypedef = dyn_cast<TypedefNameDecl>(Old)) 1383 OldType = OldTypedef->getUnderlyingType(); 1384 else 1385 OldType = Context.getTypeDeclType(Old); 1386 QualType NewType = New->getUnderlyingType(); 1387 1388 if (NewType->isVariablyModifiedType()) { 1389 // Must not redefine a typedef with a variably-modified type. 1390 int Kind = isa<TypeAliasDecl>(Old) ? 1 : 0; 1391 Diag(New->getLocation(), diag::err_redefinition_variably_modified_typedef) 1392 << Kind << NewType; 1393 if (Old->getLocation().isValid()) 1394 Diag(Old->getLocation(), diag::note_previous_definition); 1395 New->setInvalidDecl(); 1396 return true; 1397 } 1398 1399 if (OldType != NewType && 1400 !OldType->isDependentType() && 1401 !NewType->isDependentType() && 1402 !Context.hasSameType(OldType, NewType)) { 1403 int Kind = isa<TypeAliasDecl>(Old) ? 1 : 0; 1404 Diag(New->getLocation(), diag::err_redefinition_different_typedef) 1405 << Kind << NewType << OldType; 1406 if (Old->getLocation().isValid()) 1407 Diag(Old->getLocation(), diag::note_previous_definition); 1408 New->setInvalidDecl(); 1409 return true; 1410 } 1411 return false; 1412} 1413 1414/// MergeTypedefNameDecl - We just parsed a typedef 'New' which has the 1415/// same name and scope as a previous declaration 'Old'. Figure out 1416/// how to resolve this situation, merging decls or emitting 1417/// diagnostics as appropriate. If there was an error, set New to be invalid. 1418/// 1419void Sema::MergeTypedefNameDecl(TypedefNameDecl *New, LookupResult &OldDecls) { 1420 // If the new decl is known invalid already, don't bother doing any 1421 // merging checks. 1422 if (New->isInvalidDecl()) return; 1423 1424 // Allow multiple definitions for ObjC built-in typedefs. 1425 // FIXME: Verify the underlying types are equivalent! 1426 if (getLangOptions().ObjC1) { 1427 const IdentifierInfo *TypeID = New->getIdentifier(); 1428 switch (TypeID->getLength()) { 1429 default: break; 1430 case 2: 1431 if (!TypeID->isStr("id")) 1432 break; 1433 Context.setObjCIdRedefinitionType(New->getUnderlyingType()); 1434 // Install the built-in type for 'id', ignoring the current definition. 1435 New->setTypeForDecl(Context.getObjCIdType().getTypePtr()); 1436 return; 1437 case 5: 1438 if (!TypeID->isStr("Class")) 1439 break; 1440 Context.setObjCClassRedefinitionType(New->getUnderlyingType()); 1441 // Install the built-in type for 'Class', ignoring the current definition. 1442 New->setTypeForDecl(Context.getObjCClassType().getTypePtr()); 1443 return; 1444 case 3: 1445 if (!TypeID->isStr("SEL")) 1446 break; 1447 Context.setObjCSelRedefinitionType(New->getUnderlyingType()); 1448 // Install the built-in type for 'SEL', ignoring the current definition. 1449 New->setTypeForDecl(Context.getObjCSelType().getTypePtr()); 1450 return; 1451 } 1452 // Fall through - the typedef name was not a builtin type. 1453 } 1454 1455 // Verify the old decl was also a type. 1456 TypeDecl *Old = OldDecls.getAsSingle<TypeDecl>(); 1457 if (!Old) { 1458 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1459 << New->getDeclName(); 1460 1461 NamedDecl *OldD = OldDecls.getRepresentativeDecl(); 1462 if (OldD->getLocation().isValid()) 1463 Diag(OldD->getLocation(), diag::note_previous_definition); 1464 1465 return New->setInvalidDecl(); 1466 } 1467 1468 // If the old declaration is invalid, just give up here. 1469 if (Old->isInvalidDecl()) 1470 return New->setInvalidDecl(); 1471 1472 // If the typedef types are not identical, reject them in all languages and 1473 // with any extensions enabled. 1474 if (isIncompatibleTypedef(Old, New)) 1475 return; 1476 1477 // The types match. Link up the redeclaration chain if the old 1478 // declaration was a typedef. 1479 if (TypedefNameDecl *Typedef = dyn_cast<TypedefNameDecl>(Old)) 1480 New->setPreviousDeclaration(Typedef); 1481 1482 if (getLangOptions().MicrosoftExt) 1483 return; 1484 1485 if (getLangOptions().CPlusPlus) { 1486 // C++ [dcl.typedef]p2: 1487 // In a given non-class scope, a typedef specifier can be used to 1488 // redefine the name of any type declared in that scope to refer 1489 // to the type to which it already refers. 1490 if (!isa<CXXRecordDecl>(CurContext)) 1491 return; 1492 1493 // C++0x [dcl.typedef]p4: 1494 // In a given class scope, a typedef specifier can be used to redefine 1495 // any class-name declared in that scope that is not also a typedef-name 1496 // to refer to the type to which it already refers. 1497 // 1498 // This wording came in via DR424, which was a correction to the 1499 // wording in DR56, which accidentally banned code like: 1500 // 1501 // struct S { 1502 // typedef struct A { } A; 1503 // }; 1504 // 1505 // in the C++03 standard. We implement the C++0x semantics, which 1506 // allow the above but disallow 1507 // 1508 // struct S { 1509 // typedef int I; 1510 // typedef int I; 1511 // }; 1512 // 1513 // since that was the intent of DR56. 1514 if (!isa<TypedefNameDecl>(Old)) 1515 return; 1516 1517 Diag(New->getLocation(), diag::err_redefinition) 1518 << New->getDeclName(); 1519 Diag(Old->getLocation(), diag::note_previous_definition); 1520 return New->setInvalidDecl(); 1521 } 1522 1523 // Modules always permit redefinition of typedefs, as does C11. 1524 if (getLangOptions().Modules || getLangOptions().C11) 1525 return; 1526 1527 // If we have a redefinition of a typedef in C, emit a warning. This warning 1528 // is normally mapped to an error, but can be controlled with 1529 // -Wtypedef-redefinition. If either the original or the redefinition is 1530 // in a system header, don't emit this for compatibility with GCC. 1531 if (getDiagnostics().getSuppressSystemWarnings() && 1532 (Context.getSourceManager().isInSystemHeader(Old->getLocation()) || 1533 Context.getSourceManager().isInSystemHeader(New->getLocation()))) 1534 return; 1535 1536 Diag(New->getLocation(), diag::warn_redefinition_of_typedef) 1537 << New->getDeclName(); 1538 Diag(Old->getLocation(), diag::note_previous_definition); 1539 return; 1540} 1541 1542/// DeclhasAttr - returns true if decl Declaration already has the target 1543/// attribute. 1544static bool 1545DeclHasAttr(const Decl *D, const Attr *A) { 1546 const OwnershipAttr *OA = dyn_cast<OwnershipAttr>(A); 1547 const AnnotateAttr *Ann = dyn_cast<AnnotateAttr>(A); 1548 for (Decl::attr_iterator i = D->attr_begin(), e = D->attr_end(); i != e; ++i) 1549 if ((*i)->getKind() == A->getKind()) { 1550 if (Ann) { 1551 if (Ann->getAnnotation() == cast<AnnotateAttr>(*i)->getAnnotation()) 1552 return true; 1553 continue; 1554 } 1555 // FIXME: Don't hardcode this check 1556 if (OA && isa<OwnershipAttr>(*i)) 1557 return OA->getOwnKind() == cast<OwnershipAttr>(*i)->getOwnKind(); 1558 return true; 1559 } 1560 1561 return false; 1562} 1563 1564/// mergeDeclAttributes - Copy attributes from the Old decl to the New one. 1565void Sema::mergeDeclAttributes(Decl *New, Decl *Old, 1566 bool MergeDeprecation) { 1567 if (!Old->hasAttrs()) 1568 return; 1569 1570 bool foundAny = New->hasAttrs(); 1571 1572 // Ensure that any moving of objects within the allocated map is done before 1573 // we process them. 1574 if (!foundAny) New->setAttrs(AttrVec()); 1575 1576 for (specific_attr_iterator<InheritableAttr> 1577 i = Old->specific_attr_begin<InheritableAttr>(), 1578 e = Old->specific_attr_end<InheritableAttr>(); 1579 i != e; ++i) { 1580 // Ignore deprecated/unavailable/availability attributes if requested. 1581 if (!MergeDeprecation && 1582 (isa<DeprecatedAttr>(*i) || 1583 isa<UnavailableAttr>(*i) || 1584 isa<AvailabilityAttr>(*i))) 1585 continue; 1586 1587 if (!DeclHasAttr(New, *i)) { 1588 InheritableAttr *newAttr = cast<InheritableAttr>((*i)->clone(Context)); 1589 newAttr->setInherited(true); 1590 New->addAttr(newAttr); 1591 foundAny = true; 1592 } 1593 } 1594 1595 if (!foundAny) New->dropAttrs(); 1596} 1597 1598/// mergeParamDeclAttributes - Copy attributes from the old parameter 1599/// to the new one. 1600static void mergeParamDeclAttributes(ParmVarDecl *newDecl, 1601 const ParmVarDecl *oldDecl, 1602 ASTContext &C) { 1603 if (!oldDecl->hasAttrs()) 1604 return; 1605 1606 bool foundAny = newDecl->hasAttrs(); 1607 1608 // Ensure that any moving of objects within the allocated map is 1609 // done before we process them. 1610 if (!foundAny) newDecl->setAttrs(AttrVec()); 1611 1612 for (specific_attr_iterator<InheritableParamAttr> 1613 i = oldDecl->specific_attr_begin<InheritableParamAttr>(), 1614 e = oldDecl->specific_attr_end<InheritableParamAttr>(); i != e; ++i) { 1615 if (!DeclHasAttr(newDecl, *i)) { 1616 InheritableAttr *newAttr = cast<InheritableParamAttr>((*i)->clone(C)); 1617 newAttr->setInherited(true); 1618 newDecl->addAttr(newAttr); 1619 foundAny = true; 1620 } 1621 } 1622 1623 if (!foundAny) newDecl->dropAttrs(); 1624} 1625 1626namespace { 1627 1628/// Used in MergeFunctionDecl to keep track of function parameters in 1629/// C. 1630struct GNUCompatibleParamWarning { 1631 ParmVarDecl *OldParm; 1632 ParmVarDecl *NewParm; 1633 QualType PromotedType; 1634}; 1635 1636} 1637 1638/// getSpecialMember - get the special member enum for a method. 1639Sema::CXXSpecialMember Sema::getSpecialMember(const CXXMethodDecl *MD) { 1640 if (const CXXConstructorDecl *Ctor = dyn_cast<CXXConstructorDecl>(MD)) { 1641 if (Ctor->isDefaultConstructor()) 1642 return Sema::CXXDefaultConstructor; 1643 1644 if (Ctor->isCopyConstructor()) 1645 return Sema::CXXCopyConstructor; 1646 1647 if (Ctor->isMoveConstructor()) 1648 return Sema::CXXMoveConstructor; 1649 } else if (isa<CXXDestructorDecl>(MD)) { 1650 return Sema::CXXDestructor; 1651 } else if (MD->isCopyAssignmentOperator()) { 1652 return Sema::CXXCopyAssignment; 1653 } else if (MD->isMoveAssignmentOperator()) { 1654 return Sema::CXXMoveAssignment; 1655 } 1656 1657 return Sema::CXXInvalid; 1658} 1659 1660/// canRedefineFunction - checks if a function can be redefined. Currently, 1661/// only extern inline functions can be redefined, and even then only in 1662/// GNU89 mode. 1663static bool canRedefineFunction(const FunctionDecl *FD, 1664 const LangOptions& LangOpts) { 1665 return ((FD->hasAttr<GNUInlineAttr>() || LangOpts.GNUInline) && 1666 !LangOpts.CPlusPlus && 1667 FD->isInlineSpecified() && 1668 FD->getStorageClass() == SC_Extern); 1669} 1670 1671/// MergeFunctionDecl - We just parsed a function 'New' from 1672/// declarator D which has the same name and scope as a previous 1673/// declaration 'Old'. Figure out how to resolve this situation, 1674/// merging decls or emitting diagnostics as appropriate. 1675/// 1676/// In C++, New and Old must be declarations that are not 1677/// overloaded. Use IsOverload to determine whether New and Old are 1678/// overloaded, and to select the Old declaration that New should be 1679/// merged with. 1680/// 1681/// Returns true if there was an error, false otherwise. 1682bool Sema::MergeFunctionDecl(FunctionDecl *New, Decl *OldD) { 1683 // Verify the old decl was also a function. 1684 FunctionDecl *Old = 0; 1685 if (FunctionTemplateDecl *OldFunctionTemplate 1686 = dyn_cast<FunctionTemplateDecl>(OldD)) 1687 Old = OldFunctionTemplate->getTemplatedDecl(); 1688 else 1689 Old = dyn_cast<FunctionDecl>(OldD); 1690 if (!Old) { 1691 if (UsingShadowDecl *Shadow = dyn_cast<UsingShadowDecl>(OldD)) { 1692 Diag(New->getLocation(), diag::err_using_decl_conflict_reverse); 1693 Diag(Shadow->getTargetDecl()->getLocation(), 1694 diag::note_using_decl_target); 1695 Diag(Shadow->getUsingDecl()->getLocation(), 1696 diag::note_using_decl) << 0; 1697 return true; 1698 } 1699 1700 Diag(New->getLocation(), diag::err_redefinition_different_kind) 1701 << New->getDeclName(); 1702 Diag(OldD->getLocation(), diag::note_previous_definition); 1703 return true; 1704 } 1705 1706 // Determine whether the previous declaration was a definition, 1707 // implicit declaration, or a declaration. 1708 diag::kind PrevDiag; 1709 if (Old->isThisDeclarationADefinition()) 1710 PrevDiag = diag::note_previous_definition; 1711 else if (Old->isImplicit()) 1712 PrevDiag = diag::note_previous_implicit_declaration; 1713 else 1714 PrevDiag = diag::note_previous_declaration; 1715 1716 QualType OldQType = Context.getCanonicalType(Old->getType()); 1717 QualType NewQType = Context.getCanonicalType(New->getType()); 1718 1719 // Don't complain about this if we're in GNU89 mode and the old function 1720 // is an extern inline function. 1721 if (!isa<CXXMethodDecl>(New) && !isa<CXXMethodDecl>(Old) && 1722 New->getStorageClass() == SC_Static && 1723 Old->getStorageClass() != SC_Static && 1724 !canRedefineFunction(Old, getLangOptions())) { 1725 if (getLangOptions().MicrosoftExt) { 1726 Diag(New->getLocation(), diag::warn_static_non_static) << New; 1727 Diag(Old->getLocation(), PrevDiag); 1728 } else { 1729 Diag(New->getLocation(), diag::err_static_non_static) << New; 1730 Diag(Old->getLocation(), PrevDiag); 1731 return true; 1732 } 1733 } 1734 1735 // If a function is first declared with a calling convention, but is 1736 // later declared or defined without one, the second decl assumes the 1737 // calling convention of the first. 1738 // 1739 // For the new decl, we have to look at the NON-canonical type to tell the 1740 // difference between a function that really doesn't have a calling 1741 // convention and one that is declared cdecl. That's because in 1742 // canonicalization (see ASTContext.cpp), cdecl is canonicalized away 1743 // because it is the default calling convention. 1744 // 1745 // Note also that we DO NOT return at this point, because we still have 1746 // other tests to run. 1747 const FunctionType *OldType = cast<FunctionType>(OldQType); 1748 const FunctionType *NewType = New->getType()->getAs<FunctionType>(); 1749 FunctionType::ExtInfo OldTypeInfo = OldType->getExtInfo(); 1750 FunctionType::ExtInfo NewTypeInfo = NewType->getExtInfo(); 1751 bool RequiresAdjustment = false; 1752 if (OldTypeInfo.getCC() != CC_Default && 1753 NewTypeInfo.getCC() == CC_Default) { 1754 NewTypeInfo = NewTypeInfo.withCallingConv(OldTypeInfo.getCC()); 1755 RequiresAdjustment = true; 1756 } else if (!Context.isSameCallConv(OldTypeInfo.getCC(), 1757 NewTypeInfo.getCC())) { 1758 // Calling conventions really aren't compatible, so complain. 1759 Diag(New->getLocation(), diag::err_cconv_change) 1760 << FunctionType::getNameForCallConv(NewTypeInfo.getCC()) 1761 << (OldTypeInfo.getCC() == CC_Default) 1762 << (OldTypeInfo.getCC() == CC_Default ? "" : 1763 FunctionType::getNameForCallConv(OldTypeInfo.getCC())); 1764 Diag(Old->getLocation(), diag::note_previous_declaration); 1765 return true; 1766 } 1767 1768 // FIXME: diagnose the other way around? 1769 if (OldTypeInfo.getNoReturn() && !NewTypeInfo.getNoReturn()) { 1770 NewTypeInfo = NewTypeInfo.withNoReturn(true); 1771 RequiresAdjustment = true; 1772 } 1773 1774 // Merge regparm attribute. 1775 if (OldTypeInfo.getHasRegParm() != NewTypeInfo.getHasRegParm() || 1776 OldTypeInfo.getRegParm() != NewTypeInfo.getRegParm()) { 1777 if (NewTypeInfo.getHasRegParm()) { 1778 Diag(New->getLocation(), diag::err_regparm_mismatch) 1779 << NewType->getRegParmType() 1780 << OldType->getRegParmType(); 1781 Diag(Old->getLocation(), diag::note_previous_declaration); 1782 return true; 1783 } 1784 1785 NewTypeInfo = NewTypeInfo.withRegParm(OldTypeInfo.getRegParm()); 1786 RequiresAdjustment = true; 1787 } 1788 1789 // Merge ns_returns_retained attribute. 1790 if (OldTypeInfo.getProducesResult() != NewTypeInfo.getProducesResult()) { 1791 if (NewTypeInfo.getProducesResult()) { 1792 Diag(New->getLocation(), diag::err_returns_retained_mismatch); 1793 Diag(Old->getLocation(), diag::note_previous_declaration); 1794 return true; 1795 } 1796 1797 NewTypeInfo = NewTypeInfo.withProducesResult(true); 1798 RequiresAdjustment = true; 1799 } 1800 1801 if (RequiresAdjustment) { 1802 NewType = Context.adjustFunctionType(NewType, NewTypeInfo); 1803 New->setType(QualType(NewType, 0)); 1804 NewQType = Context.getCanonicalType(New->getType()); 1805 } 1806 1807 if (getLangOptions().CPlusPlus) { 1808 // (C++98 13.1p2): 1809 // Certain function declarations cannot be overloaded: 1810 // -- Function declarations that differ only in the return type 1811 // cannot be overloaded. 1812 QualType OldReturnType = OldType->getResultType(); 1813 QualType NewReturnType = cast<FunctionType>(NewQType)->getResultType(); 1814 QualType ResQT; 1815 if (OldReturnType != NewReturnType) { 1816 if (NewReturnType->isObjCObjectPointerType() 1817 && OldReturnType->isObjCObjectPointerType()) 1818 ResQT = Context.mergeObjCGCQualifiers(NewQType, OldQType); 1819 if (ResQT.isNull()) { 1820 if (New->isCXXClassMember() && New->isOutOfLine()) 1821 Diag(New->getLocation(), 1822 diag::err_member_def_does_not_match_ret_type) << New; 1823 else 1824 Diag(New->getLocation(), diag::err_ovl_diff_return_type); 1825 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1826 return true; 1827 } 1828 else 1829 NewQType = ResQT; 1830 } 1831 1832 const CXXMethodDecl* OldMethod = dyn_cast<CXXMethodDecl>(Old); 1833 CXXMethodDecl* NewMethod = dyn_cast<CXXMethodDecl>(New); 1834 if (OldMethod && NewMethod) { 1835 // Preserve triviality. 1836 NewMethod->setTrivial(OldMethod->isTrivial()); 1837 1838 // MSVC allows explicit template specialization at class scope: 1839 // 2 CXMethodDecls referring to the same function will be injected. 1840 // We don't want a redeclartion error. 1841 bool IsClassScopeExplicitSpecialization = 1842 OldMethod->isFunctionTemplateSpecialization() && 1843 NewMethod->isFunctionTemplateSpecialization(); 1844 bool isFriend = NewMethod->getFriendObjectKind(); 1845 1846 if (!isFriend && NewMethod->getLexicalDeclContext()->isRecord() && 1847 !IsClassScopeExplicitSpecialization) { 1848 // -- Member function declarations with the same name and the 1849 // same parameter types cannot be overloaded if any of them 1850 // is a static member function declaration. 1851 if (OldMethod->isStatic() || NewMethod->isStatic()) { 1852 Diag(New->getLocation(), diag::err_ovl_static_nonstatic_member); 1853 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1854 return true; 1855 } 1856 1857 // C++ [class.mem]p1: 1858 // [...] A member shall not be declared twice in the 1859 // member-specification, except that a nested class or member 1860 // class template can be declared and then later defined. 1861 unsigned NewDiag; 1862 if (isa<CXXConstructorDecl>(OldMethod)) 1863 NewDiag = diag::err_constructor_redeclared; 1864 else if (isa<CXXDestructorDecl>(NewMethod)) 1865 NewDiag = diag::err_destructor_redeclared; 1866 else if (isa<CXXConversionDecl>(NewMethod)) 1867 NewDiag = diag::err_conv_function_redeclared; 1868 else 1869 NewDiag = diag::err_member_redeclared; 1870 1871 Diag(New->getLocation(), NewDiag); 1872 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 1873 1874 // Complain if this is an explicit declaration of a special 1875 // member that was initially declared implicitly. 1876 // 1877 // As an exception, it's okay to befriend such methods in order 1878 // to permit the implicit constructor/destructor/operator calls. 1879 } else if (OldMethod->isImplicit()) { 1880 if (isFriend) { 1881 NewMethod->setImplicit(); 1882 } else { 1883 Diag(NewMethod->getLocation(), 1884 diag::err_definition_of_implicitly_declared_member) 1885 << New << getSpecialMember(OldMethod); 1886 return true; 1887 } 1888 } else if (OldMethod->isExplicitlyDefaulted()) { 1889 Diag(NewMethod->getLocation(), 1890 diag::err_definition_of_explicitly_defaulted_member) 1891 << getSpecialMember(OldMethod); 1892 return true; 1893 } 1894 } 1895 1896 // (C++98 8.3.5p3): 1897 // All declarations for a function shall agree exactly in both the 1898 // return type and the parameter-type-list. 1899 // We also want to respect all the extended bits except noreturn. 1900 1901 // noreturn should now match unless the old type info didn't have it. 1902 QualType OldQTypeForComparison = OldQType; 1903 if (!OldTypeInfo.getNoReturn() && NewTypeInfo.getNoReturn()) { 1904 assert(OldQType == QualType(OldType, 0)); 1905 const FunctionType *OldTypeForComparison 1906 = Context.adjustFunctionType(OldType, OldTypeInfo.withNoReturn(true)); 1907 OldQTypeForComparison = QualType(OldTypeForComparison, 0); 1908 assert(OldQTypeForComparison.isCanonical()); 1909 } 1910 1911 if (OldQTypeForComparison == NewQType) 1912 return MergeCompatibleFunctionDecls(New, Old); 1913 1914 // Fall through for conflicting redeclarations and redefinitions. 1915 } 1916 1917 // C: Function types need to be compatible, not identical. This handles 1918 // duplicate function decls like "void f(int); void f(enum X);" properly. 1919 if (!getLangOptions().CPlusPlus && 1920 Context.typesAreCompatible(OldQType, NewQType)) { 1921 const FunctionType *OldFuncType = OldQType->getAs<FunctionType>(); 1922 const FunctionType *NewFuncType = NewQType->getAs<FunctionType>(); 1923 const FunctionProtoType *OldProto = 0; 1924 if (isa<FunctionNoProtoType>(NewFuncType) && 1925 (OldProto = dyn_cast<FunctionProtoType>(OldFuncType))) { 1926 // The old declaration provided a function prototype, but the 1927 // new declaration does not. Merge in the prototype. 1928 assert(!OldProto->hasExceptionSpec() && "Exception spec in C"); 1929 SmallVector<QualType, 16> ParamTypes(OldProto->arg_type_begin(), 1930 OldProto->arg_type_end()); 1931 NewQType = Context.getFunctionType(NewFuncType->getResultType(), 1932 ParamTypes.data(), ParamTypes.size(), 1933 OldProto->getExtProtoInfo()); 1934 New->setType(NewQType); 1935 New->setHasInheritedPrototype(); 1936 1937 // Synthesize a parameter for each argument type. 1938 SmallVector<ParmVarDecl*, 16> Params; 1939 for (FunctionProtoType::arg_type_iterator 1940 ParamType = OldProto->arg_type_begin(), 1941 ParamEnd = OldProto->arg_type_end(); 1942 ParamType != ParamEnd; ++ParamType) { 1943 ParmVarDecl *Param = ParmVarDecl::Create(Context, New, 1944 SourceLocation(), 1945 SourceLocation(), 0, 1946 *ParamType, /*TInfo=*/0, 1947 SC_None, SC_None, 1948 0); 1949 Param->setScopeInfo(0, Params.size()); 1950 Param->setImplicit(); 1951 Params.push_back(Param); 1952 } 1953 1954 New->setParams(Params); 1955 } 1956 1957 return MergeCompatibleFunctionDecls(New, Old); 1958 } 1959 1960 // GNU C permits a K&R definition to follow a prototype declaration 1961 // if the declared types of the parameters in the K&R definition 1962 // match the types in the prototype declaration, even when the 1963 // promoted types of the parameters from the K&R definition differ 1964 // from the types in the prototype. GCC then keeps the types from 1965 // the prototype. 1966 // 1967 // If a variadic prototype is followed by a non-variadic K&R definition, 1968 // the K&R definition becomes variadic. This is sort of an edge case, but 1969 // it's legal per the standard depending on how you read C99 6.7.5.3p15 and 1970 // C99 6.9.1p8. 1971 if (!getLangOptions().CPlusPlus && 1972 Old->hasPrototype() && !New->hasPrototype() && 1973 New->getType()->getAs<FunctionProtoType>() && 1974 Old->getNumParams() == New->getNumParams()) { 1975 SmallVector<QualType, 16> ArgTypes; 1976 SmallVector<GNUCompatibleParamWarning, 16> Warnings; 1977 const FunctionProtoType *OldProto 1978 = Old->getType()->getAs<FunctionProtoType>(); 1979 const FunctionProtoType *NewProto 1980 = New->getType()->getAs<FunctionProtoType>(); 1981 1982 // Determine whether this is the GNU C extension. 1983 QualType MergedReturn = Context.mergeTypes(OldProto->getResultType(), 1984 NewProto->getResultType()); 1985 bool LooseCompatible = !MergedReturn.isNull(); 1986 for (unsigned Idx = 0, End = Old->getNumParams(); 1987 LooseCompatible && Idx != End; ++Idx) { 1988 ParmVarDecl *OldParm = Old->getParamDecl(Idx); 1989 ParmVarDecl *NewParm = New->getParamDecl(Idx); 1990 if (Context.typesAreCompatible(OldParm->getType(), 1991 NewProto->getArgType(Idx))) { 1992 ArgTypes.push_back(NewParm->getType()); 1993 } else if (Context.typesAreCompatible(OldParm->getType(), 1994 NewParm->getType(), 1995 /*CompareUnqualified=*/true)) { 1996 GNUCompatibleParamWarning Warn 1997 = { OldParm, NewParm, NewProto->getArgType(Idx) }; 1998 Warnings.push_back(Warn); 1999 ArgTypes.push_back(NewParm->getType()); 2000 } else 2001 LooseCompatible = false; 2002 } 2003 2004 if (LooseCompatible) { 2005 for (unsigned Warn = 0; Warn < Warnings.size(); ++Warn) { 2006 Diag(Warnings[Warn].NewParm->getLocation(), 2007 diag::ext_param_promoted_not_compatible_with_prototype) 2008 << Warnings[Warn].PromotedType 2009 << Warnings[Warn].OldParm->getType(); 2010 if (Warnings[Warn].OldParm->getLocation().isValid()) 2011 Diag(Warnings[Warn].OldParm->getLocation(), 2012 diag::note_previous_declaration); 2013 } 2014 2015 New->setType(Context.getFunctionType(MergedReturn, &ArgTypes[0], 2016 ArgTypes.size(), 2017 OldProto->getExtProtoInfo())); 2018 return MergeCompatibleFunctionDecls(New, Old); 2019 } 2020 2021 // Fall through to diagnose conflicting types. 2022 } 2023 2024 // A function that has already been declared has been redeclared or defined 2025 // with a different type- show appropriate diagnostic 2026 if (unsigned BuiltinID = Old->getBuiltinID()) { 2027 // The user has declared a builtin function with an incompatible 2028 // signature. 2029 if (Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 2030 // The function the user is redeclaring is a library-defined 2031 // function like 'malloc' or 'printf'. Warn about the 2032 // redeclaration, then pretend that we don't know about this 2033 // library built-in. 2034 Diag(New->getLocation(), diag::warn_redecl_library_builtin) << New; 2035 Diag(Old->getLocation(), diag::note_previous_builtin_declaration) 2036 << Old << Old->getType(); 2037 New->getIdentifier()->setBuiltinID(Builtin::NotBuiltin); 2038 Old->setInvalidDecl(); 2039 return false; 2040 } 2041 2042 PrevDiag = diag::note_previous_builtin_declaration; 2043 } 2044 2045 Diag(New->getLocation(), diag::err_conflicting_types) << New->getDeclName(); 2046 Diag(Old->getLocation(), PrevDiag) << Old << Old->getType(); 2047 return true; 2048} 2049 2050/// \brief Completes the merge of two function declarations that are 2051/// known to be compatible. 2052/// 2053/// This routine handles the merging of attributes and other 2054/// properties of function declarations form the old declaration to 2055/// the new declaration, once we know that New is in fact a 2056/// redeclaration of Old. 2057/// 2058/// \returns false 2059bool Sema::MergeCompatibleFunctionDecls(FunctionDecl *New, FunctionDecl *Old) { 2060 // Merge the attributes 2061 mergeDeclAttributes(New, Old); 2062 2063 // Merge the storage class. 2064 if (Old->getStorageClass() != SC_Extern && 2065 Old->getStorageClass() != SC_None) 2066 New->setStorageClass(Old->getStorageClass()); 2067 2068 // Merge "pure" flag. 2069 if (Old->isPure()) 2070 New->setPure(); 2071 2072 // Merge attributes from the parameters. These can mismatch with K&R 2073 // declarations. 2074 if (New->getNumParams() == Old->getNumParams()) 2075 for (unsigned i = 0, e = New->getNumParams(); i != e; ++i) 2076 mergeParamDeclAttributes(New->getParamDecl(i), Old->getParamDecl(i), 2077 Context); 2078 2079 if (getLangOptions().CPlusPlus) 2080 return MergeCXXFunctionDecl(New, Old); 2081 2082 return false; 2083} 2084 2085 2086void Sema::mergeObjCMethodDecls(ObjCMethodDecl *newMethod, 2087 ObjCMethodDecl *oldMethod) { 2088 // We don't want to merge unavailable and deprecated attributes 2089 // except from interface to implementation. 2090 bool mergeDeprecation = isa<ObjCImplDecl>(newMethod->getDeclContext()); 2091 2092 // Merge the attributes. 2093 mergeDeclAttributes(newMethod, oldMethod, mergeDeprecation); 2094 2095 // Merge attributes from the parameters. 2096 ObjCMethodDecl::param_const_iterator oi = oldMethod->param_begin(); 2097 for (ObjCMethodDecl::param_iterator 2098 ni = newMethod->param_begin(), ne = newMethod->param_end(); 2099 ni != ne; ++ni, ++oi) 2100 mergeParamDeclAttributes(*ni, *oi, Context); 2101 2102 CheckObjCMethodOverride(newMethod, oldMethod, true); 2103} 2104 2105/// MergeVarDeclTypes - We parsed a variable 'New' which has the same name and 2106/// scope as a previous declaration 'Old'. Figure out how to merge their types, 2107/// emitting diagnostics as appropriate. 2108/// 2109/// Declarations using the auto type specifier (C++ [decl.spec.auto]) call back 2110/// to here in AddInitializerToDecl and AddCXXDirectInitializerToDecl. We can't 2111/// check them before the initializer is attached. 2112/// 2113void Sema::MergeVarDeclTypes(VarDecl *New, VarDecl *Old) { 2114 if (New->isInvalidDecl() || Old->isInvalidDecl()) 2115 return; 2116 2117 QualType MergedT; 2118 if (getLangOptions().CPlusPlus) { 2119 AutoType *AT = New->getType()->getContainedAutoType(); 2120 if (AT && !AT->isDeduced()) { 2121 // We don't know what the new type is until the initializer is attached. 2122 return; 2123 } else if (Context.hasSameType(New->getType(), Old->getType())) { 2124 // These could still be something that needs exception specs checked. 2125 return MergeVarDeclExceptionSpecs(New, Old); 2126 } 2127 // C++ [basic.link]p10: 2128 // [...] the types specified by all declarations referring to a given 2129 // object or function shall be identical, except that declarations for an 2130 // array object can specify array types that differ by the presence or 2131 // absence of a major array bound (8.3.4). 2132 else if (Old->getType()->isIncompleteArrayType() && 2133 New->getType()->isArrayType()) { 2134 CanQual<ArrayType> OldArray 2135 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 2136 CanQual<ArrayType> NewArray 2137 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 2138 if (OldArray->getElementType() == NewArray->getElementType()) 2139 MergedT = New->getType(); 2140 } else if (Old->getType()->isArrayType() && 2141 New->getType()->isIncompleteArrayType()) { 2142 CanQual<ArrayType> OldArray 2143 = Context.getCanonicalType(Old->getType())->getAs<ArrayType>(); 2144 CanQual<ArrayType> NewArray 2145 = Context.getCanonicalType(New->getType())->getAs<ArrayType>(); 2146 if (OldArray->getElementType() == NewArray->getElementType()) 2147 MergedT = Old->getType(); 2148 } else if (New->getType()->isObjCObjectPointerType() 2149 && Old->getType()->isObjCObjectPointerType()) { 2150 MergedT = Context.mergeObjCGCQualifiers(New->getType(), 2151 Old->getType()); 2152 } 2153 } else { 2154 MergedT = Context.mergeTypes(New->getType(), Old->getType()); 2155 } 2156 if (MergedT.isNull()) { 2157 Diag(New->getLocation(), diag::err_redefinition_different_type) 2158 << New->getDeclName(); 2159 Diag(Old->getLocation(), diag::note_previous_definition); 2160 return New->setInvalidDecl(); 2161 } 2162 New->setType(MergedT); 2163} 2164 2165/// MergeVarDecl - We just parsed a variable 'New' which has the same name 2166/// and scope as a previous declaration 'Old'. Figure out how to resolve this 2167/// situation, merging decls or emitting diagnostics as appropriate. 2168/// 2169/// Tentative definition rules (C99 6.9.2p2) are checked by 2170/// FinalizeDeclaratorGroup. Unfortunately, we can't analyze tentative 2171/// definitions here, since the initializer hasn't been attached. 2172/// 2173void Sema::MergeVarDecl(VarDecl *New, LookupResult &Previous) { 2174 // If the new decl is already invalid, don't do any other checking. 2175 if (New->isInvalidDecl()) 2176 return; 2177 2178 // Verify the old decl was also a variable. 2179 VarDecl *Old = 0; 2180 if (!Previous.isSingleResult() || 2181 !(Old = dyn_cast<VarDecl>(Previous.getFoundDecl()))) { 2182 Diag(New->getLocation(), diag::err_redefinition_different_kind) 2183 << New->getDeclName(); 2184 Diag(Previous.getRepresentativeDecl()->getLocation(), 2185 diag::note_previous_definition); 2186 return New->setInvalidDecl(); 2187 } 2188 2189 // C++ [class.mem]p1: 2190 // A member shall not be declared twice in the member-specification [...] 2191 // 2192 // Here, we need only consider static data members. 2193 if (Old->isStaticDataMember() && !New->isOutOfLine()) { 2194 Diag(New->getLocation(), diag::err_duplicate_member) 2195 << New->getIdentifier(); 2196 Diag(Old->getLocation(), diag::note_previous_declaration); 2197 New->setInvalidDecl(); 2198 } 2199 2200 mergeDeclAttributes(New, Old); 2201 // Warn if an already-declared variable is made a weak_import in a subsequent 2202 // declaration 2203 if (New->getAttr<WeakImportAttr>() && 2204 Old->getStorageClass() == SC_None && 2205 !Old->getAttr<WeakImportAttr>()) { 2206 Diag(New->getLocation(), diag::warn_weak_import) << New->getDeclName(); 2207 Diag(Old->getLocation(), diag::note_previous_definition); 2208 // Remove weak_import attribute on new declaration. 2209 New->dropAttr<WeakImportAttr>(); 2210 } 2211 2212 // Merge the types. 2213 MergeVarDeclTypes(New, Old); 2214 if (New->isInvalidDecl()) 2215 return; 2216 2217 // C99 6.2.2p4: Check if we have a static decl followed by a non-static. 2218 if (New->getStorageClass() == SC_Static && 2219 (Old->getStorageClass() == SC_None || Old->hasExternalStorage())) { 2220 Diag(New->getLocation(), diag::err_static_non_static) << New->getDeclName(); 2221 Diag(Old->getLocation(), diag::note_previous_definition); 2222 return New->setInvalidDecl(); 2223 } 2224 // C99 6.2.2p4: 2225 // For an identifier declared with the storage-class specifier 2226 // extern in a scope in which a prior declaration of that 2227 // identifier is visible,23) if the prior declaration specifies 2228 // internal or external linkage, the linkage of the identifier at 2229 // the later declaration is the same as the linkage specified at 2230 // the prior declaration. If no prior declaration is visible, or 2231 // if the prior declaration specifies no linkage, then the 2232 // identifier has external linkage. 2233 if (New->hasExternalStorage() && Old->hasLinkage()) 2234 /* Okay */; 2235 else if (New->getStorageClass() != SC_Static && 2236 Old->getStorageClass() == SC_Static) { 2237 Diag(New->getLocation(), diag::err_non_static_static) << New->getDeclName(); 2238 Diag(Old->getLocation(), diag::note_previous_definition); 2239 return New->setInvalidDecl(); 2240 } 2241 2242 // Check if extern is followed by non-extern and vice-versa. 2243 if (New->hasExternalStorage() && 2244 !Old->hasLinkage() && Old->isLocalVarDecl()) { 2245 Diag(New->getLocation(), diag::err_extern_non_extern) << New->getDeclName(); 2246 Diag(Old->getLocation(), diag::note_previous_definition); 2247 return New->setInvalidDecl(); 2248 } 2249 if (Old->hasExternalStorage() && 2250 !New->hasLinkage() && New->isLocalVarDecl()) { 2251 Diag(New->getLocation(), diag::err_non_extern_extern) << New->getDeclName(); 2252 Diag(Old->getLocation(), diag::note_previous_definition); 2253 return New->setInvalidDecl(); 2254 } 2255 2256 // Variables with external linkage are analyzed in FinalizeDeclaratorGroup. 2257 2258 // FIXME: The test for external storage here seems wrong? We still 2259 // need to check for mismatches. 2260 if (!New->hasExternalStorage() && !New->isFileVarDecl() && 2261 // Don't complain about out-of-line definitions of static members. 2262 !(Old->getLexicalDeclContext()->isRecord() && 2263 !New->getLexicalDeclContext()->isRecord())) { 2264 Diag(New->getLocation(), diag::err_redefinition) << New->getDeclName(); 2265 Diag(Old->getLocation(), diag::note_previous_definition); 2266 return New->setInvalidDecl(); 2267 } 2268 2269 if (New->isThreadSpecified() && !Old->isThreadSpecified()) { 2270 Diag(New->getLocation(), diag::err_thread_non_thread) << New->getDeclName(); 2271 Diag(Old->getLocation(), diag::note_previous_definition); 2272 } else if (!New->isThreadSpecified() && Old->isThreadSpecified()) { 2273 Diag(New->getLocation(), diag::err_non_thread_thread) << New->getDeclName(); 2274 Diag(Old->getLocation(), diag::note_previous_definition); 2275 } 2276 2277 // C++ doesn't have tentative definitions, so go right ahead and check here. 2278 const VarDecl *Def; 2279 if (getLangOptions().CPlusPlus && 2280 New->isThisDeclarationADefinition() == VarDecl::Definition && 2281 (Def = Old->getDefinition())) { 2282 Diag(New->getLocation(), diag::err_redefinition) 2283 << New->getDeclName(); 2284 Diag(Def->getLocation(), diag::note_previous_definition); 2285 New->setInvalidDecl(); 2286 return; 2287 } 2288 // c99 6.2.2 P4. 2289 // For an identifier declared with the storage-class specifier extern in a 2290 // scope in which a prior declaration of that identifier is visible, if 2291 // the prior declaration specifies internal or external linkage, the linkage 2292 // of the identifier at the later declaration is the same as the linkage 2293 // specified at the prior declaration. 2294 // FIXME. revisit this code. 2295 if (New->hasExternalStorage() && 2296 Old->getLinkage() == InternalLinkage && 2297 New->getDeclContext() == Old->getDeclContext()) 2298 New->setStorageClass(Old->getStorageClass()); 2299 2300 // Keep a chain of previous declarations. 2301 New->setPreviousDeclaration(Old); 2302 2303 // Inherit access appropriately. 2304 New->setAccess(Old->getAccess()); 2305} 2306 2307/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2308/// no declarator (e.g. "struct foo;") is parsed. 2309Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2310 DeclSpec &DS) { 2311 return ParsedFreeStandingDeclSpec(S, AS, DS, 2312 MultiTemplateParamsArg(*this, 0, 0)); 2313} 2314 2315/// ParsedFreeStandingDeclSpec - This method is invoked when a declspec with 2316/// no declarator (e.g. "struct foo;") is parsed. It also accopts template 2317/// parameters to cope with template friend declarations. 2318Decl *Sema::ParsedFreeStandingDeclSpec(Scope *S, AccessSpecifier AS, 2319 DeclSpec &DS, 2320 MultiTemplateParamsArg TemplateParams) { 2321 Decl *TagD = 0; 2322 TagDecl *Tag = 0; 2323 if (DS.getTypeSpecType() == DeclSpec::TST_class || 2324 DS.getTypeSpecType() == DeclSpec::TST_struct || 2325 DS.getTypeSpecType() == DeclSpec::TST_union || 2326 DS.getTypeSpecType() == DeclSpec::TST_enum) { 2327 TagD = DS.getRepAsDecl(); 2328 2329 if (!TagD) // We probably had an error 2330 return 0; 2331 2332 // Note that the above type specs guarantee that the 2333 // type rep is a Decl, whereas in many of the others 2334 // it's a Type. 2335 if (isa<TagDecl>(TagD)) 2336 Tag = cast<TagDecl>(TagD); 2337 else if (ClassTemplateDecl *CTD = dyn_cast<ClassTemplateDecl>(TagD)) 2338 Tag = CTD->getTemplatedDecl(); 2339 } 2340 2341 if (Tag) 2342 Tag->setFreeStanding(); 2343 2344 if (unsigned TypeQuals = DS.getTypeQualifiers()) { 2345 // Enforce C99 6.7.3p2: "Types other than pointer types derived from object 2346 // or incomplete types shall not be restrict-qualified." 2347 if (TypeQuals & DeclSpec::TQ_restrict) 2348 Diag(DS.getRestrictSpecLoc(), 2349 diag::err_typecheck_invalid_restrict_not_pointer_noarg) 2350 << DS.getSourceRange(); 2351 } 2352 2353 if (DS.isConstexprSpecified()) { 2354 // C++0x [dcl.constexpr]p1: constexpr can only be applied to declarations 2355 // and definitions of functions and variables. 2356 if (Tag) 2357 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_tag) 2358 << (DS.getTypeSpecType() == DeclSpec::TST_class ? 0 : 2359 DS.getTypeSpecType() == DeclSpec::TST_struct ? 1 : 2360 DS.getTypeSpecType() == DeclSpec::TST_union ? 2 : 3); 2361 else 2362 Diag(DS.getConstexprSpecLoc(), diag::err_constexpr_no_declarators); 2363 // Don't emit warnings after this error. 2364 return TagD; 2365 } 2366 2367 if (DS.isFriendSpecified()) { 2368 // If we're dealing with a decl but not a TagDecl, assume that 2369 // whatever routines created it handled the friendship aspect. 2370 if (TagD && !Tag) 2371 return 0; 2372 return ActOnFriendTypeDecl(S, DS, TemplateParams); 2373 } 2374 2375 // Track whether we warned about the fact that there aren't any 2376 // declarators. 2377 bool emittedWarning = false; 2378 2379 if (RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag)) { 2380 if (!Record->getDeclName() && Record->isCompleteDefinition() && 2381 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) { 2382 if (getLangOptions().CPlusPlus || 2383 Record->getDeclContext()->isRecord()) 2384 return BuildAnonymousStructOrUnion(S, DS, AS, Record); 2385 2386 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 2387 << DS.getSourceRange(); 2388 emittedWarning = true; 2389 } 2390 } 2391 2392 // Check for Microsoft C extension: anonymous struct. 2393 if (getLangOptions().MicrosoftExt && !getLangOptions().CPlusPlus && 2394 CurContext->isRecord() && 2395 DS.getStorageClassSpec() == DeclSpec::SCS_unspecified) { 2396 // Handle 2 kinds of anonymous struct: 2397 // struct STRUCT; 2398 // and 2399 // STRUCT_TYPE; <- where STRUCT_TYPE is a typedef struct. 2400 RecordDecl *Record = dyn_cast_or_null<RecordDecl>(Tag); 2401 if ((Record && Record->getDeclName() && !Record->isCompleteDefinition()) || 2402 (DS.getTypeSpecType() == DeclSpec::TST_typename && 2403 DS.getRepAsType().get()->isStructureType())) { 2404 Diag(DS.getSourceRange().getBegin(), diag::ext_ms_anonymous_struct) 2405 << DS.getSourceRange(); 2406 return BuildMicrosoftCAnonymousStruct(S, DS, Record); 2407 } 2408 } 2409 2410 if (getLangOptions().CPlusPlus && 2411 DS.getStorageClassSpec() != DeclSpec::SCS_typedef) 2412 if (EnumDecl *Enum = dyn_cast_or_null<EnumDecl>(Tag)) 2413 if (Enum->enumerator_begin() == Enum->enumerator_end() && 2414 !Enum->getIdentifier() && !Enum->isInvalidDecl()) { 2415 Diag(Enum->getLocation(), diag::ext_no_declarators) 2416 << DS.getSourceRange(); 2417 emittedWarning = true; 2418 } 2419 2420 // Skip all the checks below if we have a type error. 2421 if (DS.getTypeSpecType() == DeclSpec::TST_error) return TagD; 2422 2423 if (!DS.isMissingDeclaratorOk()) { 2424 // Warn about typedefs of enums without names, since this is an 2425 // extension in both Microsoft and GNU. 2426 if (DS.getStorageClassSpec() == DeclSpec::SCS_typedef && 2427 Tag && isa<EnumDecl>(Tag)) { 2428 Diag(DS.getSourceRange().getBegin(), diag::ext_typedef_without_a_name) 2429 << DS.getSourceRange(); 2430 return Tag; 2431 } 2432 2433 Diag(DS.getSourceRange().getBegin(), diag::ext_no_declarators) 2434 << DS.getSourceRange(); 2435 emittedWarning = true; 2436 } 2437 2438 // We're going to complain about a bunch of spurious specifiers; 2439 // only do this if we're declaring a tag, because otherwise we 2440 // should be getting diag::ext_no_declarators. 2441 if (emittedWarning || (TagD && TagD->isInvalidDecl())) 2442 return TagD; 2443 2444 // Note that a linkage-specification sets a storage class, but 2445 // 'extern "C" struct foo;' is actually valid and not theoretically 2446 // useless. 2447 if (DeclSpec::SCS scs = DS.getStorageClassSpec()) 2448 if (!DS.isExternInLinkageSpec()) 2449 Diag(DS.getStorageClassSpecLoc(), diag::warn_standalone_specifier) 2450 << DeclSpec::getSpecifierName(scs); 2451 2452 if (DS.isThreadSpecified()) 2453 Diag(DS.getThreadSpecLoc(), diag::warn_standalone_specifier) << "__thread"; 2454 if (DS.getTypeQualifiers()) { 2455 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2456 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "const"; 2457 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2458 Diag(DS.getConstSpecLoc(), diag::warn_standalone_specifier) << "volatile"; 2459 // Restrict is covered above. 2460 } 2461 if (DS.isInlineSpecified()) 2462 Diag(DS.getInlineSpecLoc(), diag::warn_standalone_specifier) << "inline"; 2463 if (DS.isVirtualSpecified()) 2464 Diag(DS.getVirtualSpecLoc(), diag::warn_standalone_specifier) << "virtual"; 2465 if (DS.isExplicitSpecified()) 2466 Diag(DS.getExplicitSpecLoc(), diag::warn_standalone_specifier) <<"explicit"; 2467 2468 if (DS.isModulePrivateSpecified() && 2469 Tag && Tag->getDeclContext()->isFunctionOrMethod()) 2470 Diag(DS.getModulePrivateSpecLoc(), diag::err_module_private_local_class) 2471 << Tag->getTagKind() 2472 << FixItHint::CreateRemoval(DS.getModulePrivateSpecLoc()); 2473 2474 // Warn about ignored type attributes, for example: 2475 // __attribute__((aligned)) struct A; 2476 // Attributes should be placed after tag to apply to type declaration. 2477 if (!DS.getAttributes().empty()) { 2478 DeclSpec::TST TypeSpecType = DS.getTypeSpecType(); 2479 if (TypeSpecType == DeclSpec::TST_class || 2480 TypeSpecType == DeclSpec::TST_struct || 2481 TypeSpecType == DeclSpec::TST_union || 2482 TypeSpecType == DeclSpec::TST_enum) { 2483 AttributeList* attrs = DS.getAttributes().getList(); 2484 while (attrs) { 2485 Diag(attrs->getScopeLoc(), 2486 diag::warn_declspec_attribute_ignored) 2487 << attrs->getName() 2488 << (TypeSpecType == DeclSpec::TST_class ? 0 : 2489 TypeSpecType == DeclSpec::TST_struct ? 1 : 2490 TypeSpecType == DeclSpec::TST_union ? 2 : 3); 2491 attrs = attrs->getNext(); 2492 } 2493 } 2494 } 2495 2496 return TagD; 2497} 2498 2499/// We are trying to inject an anonymous member into the given scope; 2500/// check if there's an existing declaration that can't be overloaded. 2501/// 2502/// \return true if this is a forbidden redeclaration 2503static bool CheckAnonMemberRedeclaration(Sema &SemaRef, 2504 Scope *S, 2505 DeclContext *Owner, 2506 DeclarationName Name, 2507 SourceLocation NameLoc, 2508 unsigned diagnostic) { 2509 LookupResult R(SemaRef, Name, NameLoc, Sema::LookupMemberName, 2510 Sema::ForRedeclaration); 2511 if (!SemaRef.LookupName(R, S)) return false; 2512 2513 if (R.getAsSingle<TagDecl>()) 2514 return false; 2515 2516 // Pick a representative declaration. 2517 NamedDecl *PrevDecl = R.getRepresentativeDecl()->getUnderlyingDecl(); 2518 assert(PrevDecl && "Expected a non-null Decl"); 2519 2520 if (!SemaRef.isDeclInScope(PrevDecl, Owner, S)) 2521 return false; 2522 2523 SemaRef.Diag(NameLoc, diagnostic) << Name; 2524 SemaRef.Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 2525 2526 return true; 2527} 2528 2529/// InjectAnonymousStructOrUnionMembers - Inject the members of the 2530/// anonymous struct or union AnonRecord into the owning context Owner 2531/// and scope S. This routine will be invoked just after we realize 2532/// that an unnamed union or struct is actually an anonymous union or 2533/// struct, e.g., 2534/// 2535/// @code 2536/// union { 2537/// int i; 2538/// float f; 2539/// }; // InjectAnonymousStructOrUnionMembers called here to inject i and 2540/// // f into the surrounding scope.x 2541/// @endcode 2542/// 2543/// This routine is recursive, injecting the names of nested anonymous 2544/// structs/unions into the owning context and scope as well. 2545static bool InjectAnonymousStructOrUnionMembers(Sema &SemaRef, Scope *S, 2546 DeclContext *Owner, 2547 RecordDecl *AnonRecord, 2548 AccessSpecifier AS, 2549 SmallVector<NamedDecl*, 2> &Chaining, 2550 bool MSAnonStruct) { 2551 unsigned diagKind 2552 = AnonRecord->isUnion() ? diag::err_anonymous_union_member_redecl 2553 : diag::err_anonymous_struct_member_redecl; 2554 2555 bool Invalid = false; 2556 2557 // Look every FieldDecl and IndirectFieldDecl with a name. 2558 for (RecordDecl::decl_iterator D = AnonRecord->decls_begin(), 2559 DEnd = AnonRecord->decls_end(); 2560 D != DEnd; ++D) { 2561 if ((isa<FieldDecl>(*D) || isa<IndirectFieldDecl>(*D)) && 2562 cast<NamedDecl>(*D)->getDeclName()) { 2563 ValueDecl *VD = cast<ValueDecl>(*D); 2564 if (CheckAnonMemberRedeclaration(SemaRef, S, Owner, VD->getDeclName(), 2565 VD->getLocation(), diagKind)) { 2566 // C++ [class.union]p2: 2567 // The names of the members of an anonymous union shall be 2568 // distinct from the names of any other entity in the 2569 // scope in which the anonymous union is declared. 2570 Invalid = true; 2571 } else { 2572 // C++ [class.union]p2: 2573 // For the purpose of name lookup, after the anonymous union 2574 // definition, the members of the anonymous union are 2575 // considered to have been defined in the scope in which the 2576 // anonymous union is declared. 2577 unsigned OldChainingSize = Chaining.size(); 2578 if (IndirectFieldDecl *IF = dyn_cast<IndirectFieldDecl>(VD)) 2579 for (IndirectFieldDecl::chain_iterator PI = IF->chain_begin(), 2580 PE = IF->chain_end(); PI != PE; ++PI) 2581 Chaining.push_back(*PI); 2582 else 2583 Chaining.push_back(VD); 2584 2585 assert(Chaining.size() >= 2); 2586 NamedDecl **NamedChain = 2587 new (SemaRef.Context)NamedDecl*[Chaining.size()]; 2588 for (unsigned i = 0; i < Chaining.size(); i++) 2589 NamedChain[i] = Chaining[i]; 2590 2591 IndirectFieldDecl* IndirectField = 2592 IndirectFieldDecl::Create(SemaRef.Context, Owner, VD->getLocation(), 2593 VD->getIdentifier(), VD->getType(), 2594 NamedChain, Chaining.size()); 2595 2596 IndirectField->setAccess(AS); 2597 IndirectField->setImplicit(); 2598 SemaRef.PushOnScopeChains(IndirectField, S); 2599 2600 // That includes picking up the appropriate access specifier. 2601 if (AS != AS_none) IndirectField->setAccess(AS); 2602 2603 Chaining.resize(OldChainingSize); 2604 } 2605 } 2606 } 2607 2608 return Invalid; 2609} 2610 2611/// StorageClassSpecToVarDeclStorageClass - Maps a DeclSpec::SCS to 2612/// a VarDecl::StorageClass. Any error reporting is up to the caller: 2613/// illegal input values are mapped to SC_None. 2614static StorageClass 2615StorageClassSpecToVarDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2616 switch (StorageClassSpec) { 2617 case DeclSpec::SCS_unspecified: return SC_None; 2618 case DeclSpec::SCS_extern: return SC_Extern; 2619 case DeclSpec::SCS_static: return SC_Static; 2620 case DeclSpec::SCS_auto: return SC_Auto; 2621 case DeclSpec::SCS_register: return SC_Register; 2622 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2623 // Illegal SCSs map to None: error reporting is up to the caller. 2624 case DeclSpec::SCS_mutable: // Fall through. 2625 case DeclSpec::SCS_typedef: return SC_None; 2626 } 2627 llvm_unreachable("unknown storage class specifier"); 2628} 2629 2630/// StorageClassSpecToFunctionDeclStorageClass - Maps a DeclSpec::SCS to 2631/// a StorageClass. Any error reporting is up to the caller: 2632/// illegal input values are mapped to SC_None. 2633static StorageClass 2634StorageClassSpecToFunctionDeclStorageClass(DeclSpec::SCS StorageClassSpec) { 2635 switch (StorageClassSpec) { 2636 case DeclSpec::SCS_unspecified: return SC_None; 2637 case DeclSpec::SCS_extern: return SC_Extern; 2638 case DeclSpec::SCS_static: return SC_Static; 2639 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 2640 // Illegal SCSs map to None: error reporting is up to the caller. 2641 case DeclSpec::SCS_auto: // Fall through. 2642 case DeclSpec::SCS_mutable: // Fall through. 2643 case DeclSpec::SCS_register: // Fall through. 2644 case DeclSpec::SCS_typedef: return SC_None; 2645 } 2646 llvm_unreachable("unknown storage class specifier"); 2647} 2648 2649/// BuildAnonymousStructOrUnion - Handle the declaration of an 2650/// anonymous structure or union. Anonymous unions are a C++ feature 2651/// (C++ [class.union]) and a GNU C extension; anonymous structures 2652/// are a GNU C and GNU C++ extension. 2653Decl *Sema::BuildAnonymousStructOrUnion(Scope *S, DeclSpec &DS, 2654 AccessSpecifier AS, 2655 RecordDecl *Record) { 2656 DeclContext *Owner = Record->getDeclContext(); 2657 2658 // Diagnose whether this anonymous struct/union is an extension. 2659 if (Record->isUnion() && !getLangOptions().CPlusPlus) 2660 Diag(Record->getLocation(), diag::ext_anonymous_union); 2661 else if (!Record->isUnion()) 2662 Diag(Record->getLocation(), diag::ext_anonymous_struct); 2663 2664 // C and C++ require different kinds of checks for anonymous 2665 // structs/unions. 2666 bool Invalid = false; 2667 if (getLangOptions().CPlusPlus) { 2668 const char* PrevSpec = 0; 2669 unsigned DiagID; 2670 if (Record->isUnion()) { 2671 // C++ [class.union]p6: 2672 // Anonymous unions declared in a named namespace or in the 2673 // global namespace shall be declared static. 2674 if (DS.getStorageClassSpec() != DeclSpec::SCS_static && 2675 (isa<TranslationUnitDecl>(Owner) || 2676 (isa<NamespaceDecl>(Owner) && 2677 cast<NamespaceDecl>(Owner)->getDeclName()))) { 2678 Diag(Record->getLocation(), diag::err_anonymous_union_not_static) 2679 << FixItHint::CreateInsertion(Record->getLocation(), "static "); 2680 2681 // Recover by adding 'static'. 2682 DS.SetStorageClassSpec(*this, DeclSpec::SCS_static, SourceLocation(), 2683 PrevSpec, DiagID); 2684 } 2685 // C++ [class.union]p6: 2686 // A storage class is not allowed in a declaration of an 2687 // anonymous union in a class scope. 2688 else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified && 2689 isa<RecordDecl>(Owner)) { 2690 Diag(DS.getStorageClassSpecLoc(), 2691 diag::err_anonymous_union_with_storage_spec) 2692 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc()); 2693 2694 // Recover by removing the storage specifier. 2695 DS.SetStorageClassSpec(*this, DeclSpec::SCS_unspecified, 2696 SourceLocation(), 2697 PrevSpec, DiagID); 2698 } 2699 } 2700 2701 // Ignore const/volatile/restrict qualifiers. 2702 if (DS.getTypeQualifiers()) { 2703 if (DS.getTypeQualifiers() & DeclSpec::TQ_const) 2704 Diag(DS.getConstSpecLoc(), diag::ext_anonymous_struct_union_qualified) 2705 << Record->isUnion() << 0 2706 << FixItHint::CreateRemoval(DS.getConstSpecLoc()); 2707 if (DS.getTypeQualifiers() & DeclSpec::TQ_volatile) 2708 Diag(DS.getVolatileSpecLoc(), 2709 diag::ext_anonymous_struct_union_qualified) 2710 << Record->isUnion() << 1 2711 << FixItHint::CreateRemoval(DS.getVolatileSpecLoc()); 2712 if (DS.getTypeQualifiers() & DeclSpec::TQ_restrict) 2713 Diag(DS.getRestrictSpecLoc(), 2714 diag::ext_anonymous_struct_union_qualified) 2715 << Record->isUnion() << 2 2716 << FixItHint::CreateRemoval(DS.getRestrictSpecLoc()); 2717 2718 DS.ClearTypeQualifiers(); 2719 } 2720 2721 // C++ [class.union]p2: 2722 // The member-specification of an anonymous union shall only 2723 // define non-static data members. [Note: nested types and 2724 // functions cannot be declared within an anonymous union. ] 2725 for (DeclContext::decl_iterator Mem = Record->decls_begin(), 2726 MemEnd = Record->decls_end(); 2727 Mem != MemEnd; ++Mem) { 2728 if (FieldDecl *FD = dyn_cast<FieldDecl>(*Mem)) { 2729 // C++ [class.union]p3: 2730 // An anonymous union shall not have private or protected 2731 // members (clause 11). 2732 assert(FD->getAccess() != AS_none); 2733 if (FD->getAccess() != AS_public) { 2734 Diag(FD->getLocation(), diag::err_anonymous_record_nonpublic_member) 2735 << (int)Record->isUnion() << (int)(FD->getAccess() == AS_protected); 2736 Invalid = true; 2737 } 2738 2739 // C++ [class.union]p1 2740 // An object of a class with a non-trivial constructor, a non-trivial 2741 // copy constructor, a non-trivial destructor, or a non-trivial copy 2742 // assignment operator cannot be a member of a union, nor can an 2743 // array of such objects. 2744 if (CheckNontrivialField(FD)) 2745 Invalid = true; 2746 } else if ((*Mem)->isImplicit()) { 2747 // Any implicit members are fine. 2748 } else if (isa<TagDecl>(*Mem) && (*Mem)->getDeclContext() != Record) { 2749 // This is a type that showed up in an 2750 // elaborated-type-specifier inside the anonymous struct or 2751 // union, but which actually declares a type outside of the 2752 // anonymous struct or union. It's okay. 2753 } else if (RecordDecl *MemRecord = dyn_cast<RecordDecl>(*Mem)) { 2754 if (!MemRecord->isAnonymousStructOrUnion() && 2755 MemRecord->getDeclName()) { 2756 // Visual C++ allows type definition in anonymous struct or union. 2757 if (getLangOptions().MicrosoftExt) 2758 Diag(MemRecord->getLocation(), diag::ext_anonymous_record_with_type) 2759 << (int)Record->isUnion(); 2760 else { 2761 // This is a nested type declaration. 2762 Diag(MemRecord->getLocation(), diag::err_anonymous_record_with_type) 2763 << (int)Record->isUnion(); 2764 Invalid = true; 2765 } 2766 } 2767 } else if (isa<AccessSpecDecl>(*Mem)) { 2768 // Any access specifier is fine. 2769 } else { 2770 // We have something that isn't a non-static data 2771 // member. Complain about it. 2772 unsigned DK = diag::err_anonymous_record_bad_member; 2773 if (isa<TypeDecl>(*Mem)) 2774 DK = diag::err_anonymous_record_with_type; 2775 else if (isa<FunctionDecl>(*Mem)) 2776 DK = diag::err_anonymous_record_with_function; 2777 else if (isa<VarDecl>(*Mem)) 2778 DK = diag::err_anonymous_record_with_static; 2779 2780 // Visual C++ allows type definition in anonymous struct or union. 2781 if (getLangOptions().MicrosoftExt && 2782 DK == diag::err_anonymous_record_with_type) 2783 Diag((*Mem)->getLocation(), diag::ext_anonymous_record_with_type) 2784 << (int)Record->isUnion(); 2785 else { 2786 Diag((*Mem)->getLocation(), DK) 2787 << (int)Record->isUnion(); 2788 Invalid = true; 2789 } 2790 } 2791 } 2792 } 2793 2794 if (!Record->isUnion() && !Owner->isRecord()) { 2795 Diag(Record->getLocation(), diag::err_anonymous_struct_not_member) 2796 << (int)getLangOptions().CPlusPlus; 2797 Invalid = true; 2798 } 2799 2800 // Mock up a declarator. 2801 Declarator Dc(DS, Declarator::MemberContext); 2802 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2803 assert(TInfo && "couldn't build declarator info for anonymous struct/union"); 2804 2805 // Create a declaration for this anonymous struct/union. 2806 NamedDecl *Anon = 0; 2807 if (RecordDecl *OwningClass = dyn_cast<RecordDecl>(Owner)) { 2808 Anon = FieldDecl::Create(Context, OwningClass, 2809 DS.getSourceRange().getBegin(), 2810 Record->getLocation(), 2811 /*IdentifierInfo=*/0, 2812 Context.getTypeDeclType(Record), 2813 TInfo, 2814 /*BitWidth=*/0, /*Mutable=*/false, 2815 /*HasInit=*/false); 2816 Anon->setAccess(AS); 2817 if (getLangOptions().CPlusPlus) 2818 FieldCollector->Add(cast<FieldDecl>(Anon)); 2819 } else { 2820 DeclSpec::SCS SCSpec = DS.getStorageClassSpec(); 2821 assert(SCSpec != DeclSpec::SCS_typedef && 2822 "Parser allowed 'typedef' as storage class VarDecl."); 2823 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 2824 if (SCSpec == DeclSpec::SCS_mutable) { 2825 // mutable can only appear on non-static class members, so it's always 2826 // an error here 2827 Diag(Record->getLocation(), diag::err_mutable_nonmember); 2828 Invalid = true; 2829 SC = SC_None; 2830 } 2831 SCSpec = DS.getStorageClassSpecAsWritten(); 2832 VarDecl::StorageClass SCAsWritten 2833 = StorageClassSpecToVarDeclStorageClass(SCSpec); 2834 2835 Anon = VarDecl::Create(Context, Owner, 2836 DS.getSourceRange().getBegin(), 2837 Record->getLocation(), /*IdentifierInfo=*/0, 2838 Context.getTypeDeclType(Record), 2839 TInfo, SC, SCAsWritten); 2840 2841 // Default-initialize the implicit variable. This initialization will be 2842 // trivial in almost all cases, except if a union member has an in-class 2843 // initializer: 2844 // union { int n = 0; }; 2845 ActOnUninitializedDecl(Anon, /*TypeMayContainAuto=*/false); 2846 } 2847 Anon->setImplicit(); 2848 2849 // Add the anonymous struct/union object to the current 2850 // context. We'll be referencing this object when we refer to one of 2851 // its members. 2852 Owner->addDecl(Anon); 2853 2854 // Inject the members of the anonymous struct/union into the owning 2855 // context and into the identifier resolver chain for name lookup 2856 // purposes. 2857 SmallVector<NamedDecl*, 2> Chain; 2858 Chain.push_back(Anon); 2859 2860 if (InjectAnonymousStructOrUnionMembers(*this, S, Owner, Record, AS, 2861 Chain, false)) 2862 Invalid = true; 2863 2864 // Mark this as an anonymous struct/union type. Note that we do not 2865 // do this until after we have already checked and injected the 2866 // members of this anonymous struct/union type, because otherwise 2867 // the members could be injected twice: once by DeclContext when it 2868 // builds its lookup table, and once by 2869 // InjectAnonymousStructOrUnionMembers. 2870 Record->setAnonymousStructOrUnion(true); 2871 2872 if (Invalid) 2873 Anon->setInvalidDecl(); 2874 2875 return Anon; 2876} 2877 2878/// BuildMicrosoftCAnonymousStruct - Handle the declaration of an 2879/// Microsoft C anonymous structure. 2880/// Ref: http://msdn.microsoft.com/en-us/library/z2cx9y4f.aspx 2881/// Example: 2882/// 2883/// struct A { int a; }; 2884/// struct B { struct A; int b; }; 2885/// 2886/// void foo() { 2887/// B var; 2888/// var.a = 3; 2889/// } 2890/// 2891Decl *Sema::BuildMicrosoftCAnonymousStruct(Scope *S, DeclSpec &DS, 2892 RecordDecl *Record) { 2893 2894 // If there is no Record, get the record via the typedef. 2895 if (!Record) 2896 Record = DS.getRepAsType().get()->getAsStructureType()->getDecl(); 2897 2898 // Mock up a declarator. 2899 Declarator Dc(DS, Declarator::TypeNameContext); 2900 TypeSourceInfo *TInfo = GetTypeForDeclarator(Dc, S); 2901 assert(TInfo && "couldn't build declarator info for anonymous struct"); 2902 2903 // Create a declaration for this anonymous struct. 2904 NamedDecl* Anon = FieldDecl::Create(Context, 2905 cast<RecordDecl>(CurContext), 2906 DS.getSourceRange().getBegin(), 2907 DS.getSourceRange().getBegin(), 2908 /*IdentifierInfo=*/0, 2909 Context.getTypeDeclType(Record), 2910 TInfo, 2911 /*BitWidth=*/0, /*Mutable=*/false, 2912 /*HasInit=*/false); 2913 Anon->setImplicit(); 2914 2915 // Add the anonymous struct object to the current context. 2916 CurContext->addDecl(Anon); 2917 2918 // Inject the members of the anonymous struct into the current 2919 // context and into the identifier resolver chain for name lookup 2920 // purposes. 2921 SmallVector<NamedDecl*, 2> Chain; 2922 Chain.push_back(Anon); 2923 2924 if (InjectAnonymousStructOrUnionMembers(*this, S, CurContext, 2925 Record->getDefinition(), 2926 AS_none, Chain, true)) 2927 Anon->setInvalidDecl(); 2928 2929 return Anon; 2930} 2931 2932/// GetNameForDeclarator - Determine the full declaration name for the 2933/// given Declarator. 2934DeclarationNameInfo Sema::GetNameForDeclarator(Declarator &D) { 2935 return GetNameFromUnqualifiedId(D.getName()); 2936} 2937 2938/// \brief Retrieves the declaration name from a parsed unqualified-id. 2939DeclarationNameInfo 2940Sema::GetNameFromUnqualifiedId(const UnqualifiedId &Name) { 2941 DeclarationNameInfo NameInfo; 2942 NameInfo.setLoc(Name.StartLocation); 2943 2944 switch (Name.getKind()) { 2945 2946 case UnqualifiedId::IK_ImplicitSelfParam: 2947 case UnqualifiedId::IK_Identifier: 2948 NameInfo.setName(Name.Identifier); 2949 NameInfo.setLoc(Name.StartLocation); 2950 return NameInfo; 2951 2952 case UnqualifiedId::IK_OperatorFunctionId: 2953 NameInfo.setName(Context.DeclarationNames.getCXXOperatorName( 2954 Name.OperatorFunctionId.Operator)); 2955 NameInfo.setLoc(Name.StartLocation); 2956 NameInfo.getInfo().CXXOperatorName.BeginOpNameLoc 2957 = Name.OperatorFunctionId.SymbolLocations[0]; 2958 NameInfo.getInfo().CXXOperatorName.EndOpNameLoc 2959 = Name.EndLocation.getRawEncoding(); 2960 return NameInfo; 2961 2962 case UnqualifiedId::IK_LiteralOperatorId: 2963 NameInfo.setName(Context.DeclarationNames.getCXXLiteralOperatorName( 2964 Name.Identifier)); 2965 NameInfo.setLoc(Name.StartLocation); 2966 NameInfo.setCXXLiteralOperatorNameLoc(Name.EndLocation); 2967 return NameInfo; 2968 2969 case UnqualifiedId::IK_ConversionFunctionId: { 2970 TypeSourceInfo *TInfo; 2971 QualType Ty = GetTypeFromParser(Name.ConversionFunctionId, &TInfo); 2972 if (Ty.isNull()) 2973 return DeclarationNameInfo(); 2974 NameInfo.setName(Context.DeclarationNames.getCXXConversionFunctionName( 2975 Context.getCanonicalType(Ty))); 2976 NameInfo.setLoc(Name.StartLocation); 2977 NameInfo.setNamedTypeInfo(TInfo); 2978 return NameInfo; 2979 } 2980 2981 case UnqualifiedId::IK_ConstructorName: { 2982 TypeSourceInfo *TInfo; 2983 QualType Ty = GetTypeFromParser(Name.ConstructorName, &TInfo); 2984 if (Ty.isNull()) 2985 return DeclarationNameInfo(); 2986 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 2987 Context.getCanonicalType(Ty))); 2988 NameInfo.setLoc(Name.StartLocation); 2989 NameInfo.setNamedTypeInfo(TInfo); 2990 return NameInfo; 2991 } 2992 2993 case UnqualifiedId::IK_ConstructorTemplateId: { 2994 // In well-formed code, we can only have a constructor 2995 // template-id that refers to the current context, so go there 2996 // to find the actual type being constructed. 2997 CXXRecordDecl *CurClass = dyn_cast<CXXRecordDecl>(CurContext); 2998 if (!CurClass || CurClass->getIdentifier() != Name.TemplateId->Name) 2999 return DeclarationNameInfo(); 3000 3001 // Determine the type of the class being constructed. 3002 QualType CurClassType = Context.getTypeDeclType(CurClass); 3003 3004 // FIXME: Check two things: that the template-id names the same type as 3005 // CurClassType, and that the template-id does not occur when the name 3006 // was qualified. 3007 3008 NameInfo.setName(Context.DeclarationNames.getCXXConstructorName( 3009 Context.getCanonicalType(CurClassType))); 3010 NameInfo.setLoc(Name.StartLocation); 3011 // FIXME: should we retrieve TypeSourceInfo? 3012 NameInfo.setNamedTypeInfo(0); 3013 return NameInfo; 3014 } 3015 3016 case UnqualifiedId::IK_DestructorName: { 3017 TypeSourceInfo *TInfo; 3018 QualType Ty = GetTypeFromParser(Name.DestructorName, &TInfo); 3019 if (Ty.isNull()) 3020 return DeclarationNameInfo(); 3021 NameInfo.setName(Context.DeclarationNames.getCXXDestructorName( 3022 Context.getCanonicalType(Ty))); 3023 NameInfo.setLoc(Name.StartLocation); 3024 NameInfo.setNamedTypeInfo(TInfo); 3025 return NameInfo; 3026 } 3027 3028 case UnqualifiedId::IK_TemplateId: { 3029 TemplateName TName = Name.TemplateId->Template.get(); 3030 SourceLocation TNameLoc = Name.TemplateId->TemplateNameLoc; 3031 return Context.getNameForTemplate(TName, TNameLoc); 3032 } 3033 3034 } // switch (Name.getKind()) 3035 3036 llvm_unreachable("Unknown name kind"); 3037} 3038 3039static QualType getCoreType(QualType Ty) { 3040 do { 3041 if (Ty->isPointerType() || Ty->isReferenceType()) 3042 Ty = Ty->getPointeeType(); 3043 else if (Ty->isArrayType()) 3044 Ty = Ty->castAsArrayTypeUnsafe()->getElementType(); 3045 else 3046 return Ty.withoutLocalFastQualifiers(); 3047 } while (true); 3048} 3049 3050/// hasSimilarParameters - Determine whether the C++ functions Declaration 3051/// and Definition have "nearly" matching parameters. This heuristic is 3052/// used to improve diagnostics in the case where an out-of-line function 3053/// definition doesn't match any declaration within the class or namespace. 3054/// Also sets Params to the list of indices to the parameters that differ 3055/// between the declaration and the definition. If hasSimilarParameters 3056/// returns true and Params is empty, then all of the parameters match. 3057static bool hasSimilarParameters(ASTContext &Context, 3058 FunctionDecl *Declaration, 3059 FunctionDecl *Definition, 3060 llvm::SmallVectorImpl<unsigned> &Params) { 3061 Params.clear(); 3062 if (Declaration->param_size() != Definition->param_size()) 3063 return false; 3064 for (unsigned Idx = 0; Idx < Declaration->param_size(); ++Idx) { 3065 QualType DeclParamTy = Declaration->getParamDecl(Idx)->getType(); 3066 QualType DefParamTy = Definition->getParamDecl(Idx)->getType(); 3067 3068 // The parameter types are identical 3069 if (Context.hasSameType(DefParamTy, DeclParamTy)) 3070 continue; 3071 3072 QualType DeclParamBaseTy = getCoreType(DeclParamTy); 3073 QualType DefParamBaseTy = getCoreType(DefParamTy); 3074 const IdentifierInfo *DeclTyName = DeclParamBaseTy.getBaseTypeIdentifier(); 3075 const IdentifierInfo *DefTyName = DefParamBaseTy.getBaseTypeIdentifier(); 3076 3077 if (Context.hasSameUnqualifiedType(DeclParamBaseTy, DefParamBaseTy) || 3078 (DeclTyName && DeclTyName == DefTyName)) 3079 Params.push_back(Idx); 3080 else // The two parameters aren't even close 3081 return false; 3082 } 3083 3084 return true; 3085} 3086 3087/// NeedsRebuildingInCurrentInstantiation - Checks whether the given 3088/// declarator needs to be rebuilt in the current instantiation. 3089/// Any bits of declarator which appear before the name are valid for 3090/// consideration here. That's specifically the type in the decl spec 3091/// and the base type in any member-pointer chunks. 3092static bool RebuildDeclaratorInCurrentInstantiation(Sema &S, Declarator &D, 3093 DeclarationName Name) { 3094 // The types we specifically need to rebuild are: 3095 // - typenames, typeofs, and decltypes 3096 // - types which will become injected class names 3097 // Of course, we also need to rebuild any type referencing such a 3098 // type. It's safest to just say "dependent", but we call out a 3099 // few cases here. 3100 3101 DeclSpec &DS = D.getMutableDeclSpec(); 3102 switch (DS.getTypeSpecType()) { 3103 case DeclSpec::TST_typename: 3104 case DeclSpec::TST_typeofType: 3105 case DeclSpec::TST_decltype: 3106 case DeclSpec::TST_underlyingType: 3107 case DeclSpec::TST_atomic: { 3108 // Grab the type from the parser. 3109 TypeSourceInfo *TSI = 0; 3110 QualType T = S.GetTypeFromParser(DS.getRepAsType(), &TSI); 3111 if (T.isNull() || !T->isDependentType()) break; 3112 3113 // Make sure there's a type source info. This isn't really much 3114 // of a waste; most dependent types should have type source info 3115 // attached already. 3116 if (!TSI) 3117 TSI = S.Context.getTrivialTypeSourceInfo(T, DS.getTypeSpecTypeLoc()); 3118 3119 // Rebuild the type in the current instantiation. 3120 TSI = S.RebuildTypeInCurrentInstantiation(TSI, D.getIdentifierLoc(), Name); 3121 if (!TSI) return true; 3122 3123 // Store the new type back in the decl spec. 3124 ParsedType LocType = S.CreateParsedType(TSI->getType(), TSI); 3125 DS.UpdateTypeRep(LocType); 3126 break; 3127 } 3128 3129 case DeclSpec::TST_typeofExpr: { 3130 Expr *E = DS.getRepAsExpr(); 3131 ExprResult Result = S.RebuildExprInCurrentInstantiation(E); 3132 if (Result.isInvalid()) return true; 3133 DS.UpdateExprRep(Result.get()); 3134 break; 3135 } 3136 3137 default: 3138 // Nothing to do for these decl specs. 3139 break; 3140 } 3141 3142 // It doesn't matter what order we do this in. 3143 for (unsigned I = 0, E = D.getNumTypeObjects(); I != E; ++I) { 3144 DeclaratorChunk &Chunk = D.getTypeObject(I); 3145 3146 // The only type information in the declarator which can come 3147 // before the declaration name is the base type of a member 3148 // pointer. 3149 if (Chunk.Kind != DeclaratorChunk::MemberPointer) 3150 continue; 3151 3152 // Rebuild the scope specifier in-place. 3153 CXXScopeSpec &SS = Chunk.Mem.Scope(); 3154 if (S.RebuildNestedNameSpecifierInCurrentInstantiation(SS)) 3155 return true; 3156 } 3157 3158 return false; 3159} 3160 3161Decl *Sema::ActOnDeclarator(Scope *S, Declarator &D) { 3162 D.setFunctionDefinitionKind(FDK_Declaration); 3163 Decl *Dcl = HandleDeclarator(S, D, MultiTemplateParamsArg(*this)); 3164 3165 if (OriginalLexicalContext && OriginalLexicalContext->isObjCContainer() && 3166 Dcl->getDeclContext()->isFileContext()) 3167 Dcl->setTopLevelDeclInObjCContainer(); 3168 3169 return Dcl; 3170} 3171 3172/// DiagnoseClassNameShadow - Implement C++ [class.mem]p13: 3173/// If T is the name of a class, then each of the following shall have a 3174/// name different from T: 3175/// - every static data member of class T; 3176/// - every member function of class T 3177/// - every member of class T that is itself a type; 3178/// \returns true if the declaration name violates these rules. 3179bool Sema::DiagnoseClassNameShadow(DeclContext *DC, 3180 DeclarationNameInfo NameInfo) { 3181 DeclarationName Name = NameInfo.getName(); 3182 3183 if (CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(DC)) 3184 if (Record->getIdentifier() && Record->getDeclName() == Name) { 3185 Diag(NameInfo.getLoc(), diag::err_member_name_of_class) << Name; 3186 return true; 3187 } 3188 3189 return false; 3190} 3191 3192Decl *Sema::HandleDeclarator(Scope *S, Declarator &D, 3193 MultiTemplateParamsArg TemplateParamLists) { 3194 // TODO: consider using NameInfo for diagnostic. 3195 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 3196 DeclarationName Name = NameInfo.getName(); 3197 3198 // All of these full declarators require an identifier. If it doesn't have 3199 // one, the ParsedFreeStandingDeclSpec action should be used. 3200 if (!Name) { 3201 if (!D.isInvalidType()) // Reject this if we think it is valid. 3202 Diag(D.getDeclSpec().getSourceRange().getBegin(), 3203 diag::err_declarator_need_ident) 3204 << D.getDeclSpec().getSourceRange() << D.getSourceRange(); 3205 return 0; 3206 } else if (DiagnoseUnexpandedParameterPack(NameInfo, UPPC_DeclarationType)) 3207 return 0; 3208 3209 // The scope passed in may not be a decl scope. Zip up the scope tree until 3210 // we find one that is. 3211 while ((S->getFlags() & Scope::DeclScope) == 0 || 3212 (S->getFlags() & Scope::TemplateParamScope) != 0) 3213 S = S->getParent(); 3214 3215 DeclContext *DC = CurContext; 3216 if (D.getCXXScopeSpec().isInvalid()) 3217 D.setInvalidType(); 3218 else if (D.getCXXScopeSpec().isSet()) { 3219 if (DiagnoseUnexpandedParameterPack(D.getCXXScopeSpec(), 3220 UPPC_DeclarationQualifier)) 3221 return 0; 3222 3223 bool EnteringContext = !D.getDeclSpec().isFriendSpecified(); 3224 DC = computeDeclContext(D.getCXXScopeSpec(), EnteringContext); 3225 if (!DC) { 3226 // If we could not compute the declaration context, it's because the 3227 // declaration context is dependent but does not refer to a class, 3228 // class template, or class template partial specialization. Complain 3229 // and return early, to avoid the coming semantic disaster. 3230 Diag(D.getIdentifierLoc(), 3231 diag::err_template_qualified_declarator_no_match) 3232 << (NestedNameSpecifier*)D.getCXXScopeSpec().getScopeRep() 3233 << D.getCXXScopeSpec().getRange(); 3234 return 0; 3235 } 3236 bool IsDependentContext = DC->isDependentContext(); 3237 3238 if (!IsDependentContext && 3239 RequireCompleteDeclContext(D.getCXXScopeSpec(), DC)) 3240 return 0; 3241 3242 if (isa<CXXRecordDecl>(DC)) { 3243 if (!cast<CXXRecordDecl>(DC)->hasDefinition()) { 3244 Diag(D.getIdentifierLoc(), 3245 diag::err_member_def_undefined_record) 3246 << Name << DC << D.getCXXScopeSpec().getRange(); 3247 D.setInvalidType(); 3248 } else if (isa<CXXRecordDecl>(CurContext) && 3249 !D.getDeclSpec().isFriendSpecified()) { 3250 // The user provided a superfluous scope specifier inside a class 3251 // definition: 3252 // 3253 // class X { 3254 // void X::f(); 3255 // }; 3256 if (CurContext->Equals(DC)) { 3257 Diag(D.getIdentifierLoc(), diag::warn_member_extra_qualification) 3258 << Name << FixItHint::CreateRemoval(D.getCXXScopeSpec().getRange()); 3259 } else { 3260 Diag(D.getIdentifierLoc(), diag::err_member_qualification) 3261 << Name << D.getCXXScopeSpec().getRange(); 3262 3263 // C++ constructors and destructors with incorrect scopes can break 3264 // our AST invariants by having the wrong underlying types. If 3265 // that's the case, then drop this declaration entirely. 3266 if ((Name.getNameKind() == DeclarationName::CXXConstructorName || 3267 Name.getNameKind() == DeclarationName::CXXDestructorName) && 3268 !Context.hasSameType(Name.getCXXNameType(), 3269 Context.getTypeDeclType(cast<CXXRecordDecl>(CurContext)))) 3270 return 0; 3271 } 3272 3273 // Pretend that this qualifier was not here. 3274 D.getCXXScopeSpec().clear(); 3275 } 3276 } 3277 3278 // Check whether we need to rebuild the type of the given 3279 // declaration in the current instantiation. 3280 if (EnteringContext && IsDependentContext && 3281 TemplateParamLists.size() != 0) { 3282 ContextRAII SavedContext(*this, DC); 3283 if (RebuildDeclaratorInCurrentInstantiation(*this, D, Name)) 3284 D.setInvalidType(); 3285 } 3286 } 3287 3288 if (DiagnoseClassNameShadow(DC, NameInfo)) 3289 // If this is a typedef, we'll end up spewing multiple diagnostics. 3290 // Just return early; it's safer. 3291 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3292 return 0; 3293 3294 NamedDecl *New; 3295 3296 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 3297 QualType R = TInfo->getType(); 3298 3299 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 3300 UPPC_DeclarationType)) 3301 D.setInvalidType(); 3302 3303 LookupResult Previous(*this, NameInfo, LookupOrdinaryName, 3304 ForRedeclaration); 3305 3306 // See if this is a redefinition of a variable in the same scope. 3307 if (!D.getCXXScopeSpec().isSet()) { 3308 bool IsLinkageLookup = false; 3309 3310 // If the declaration we're planning to build will be a function 3311 // or object with linkage, then look for another declaration with 3312 // linkage (C99 6.2.2p4-5 and C++ [basic.link]p6). 3313 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) 3314 /* Do nothing*/; 3315 else if (R->isFunctionType()) { 3316 if (CurContext->isFunctionOrMethod() || 3317 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3318 IsLinkageLookup = true; 3319 } else if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_extern) 3320 IsLinkageLookup = true; 3321 else if (CurContext->getRedeclContext()->isTranslationUnit() && 3322 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_static) 3323 IsLinkageLookup = true; 3324 3325 if (IsLinkageLookup) 3326 Previous.clear(LookupRedeclarationWithLinkage); 3327 3328 LookupName(Previous, S, /* CreateBuiltins = */ IsLinkageLookup); 3329 } else { // Something like "int foo::x;" 3330 LookupQualifiedName(Previous, DC); 3331 3332 // Don't consider using declarations as previous declarations for 3333 // out-of-line members. 3334 RemoveUsingDecls(Previous); 3335 3336 // C++ 7.3.1.2p2: 3337 // Members (including explicit specializations of templates) of a named 3338 // namespace can also be defined outside that namespace by explicit 3339 // qualification of the name being defined, provided that the entity being 3340 // defined was already declared in the namespace and the definition appears 3341 // after the point of declaration in a namespace that encloses the 3342 // declarations namespace. 3343 // 3344 // Note that we only check the context at this point. We don't yet 3345 // have enough information to make sure that PrevDecl is actually 3346 // the declaration we want to match. For example, given: 3347 // 3348 // class X { 3349 // void f(); 3350 // void f(float); 3351 // }; 3352 // 3353 // void X::f(int) { } // ill-formed 3354 // 3355 // In this case, PrevDecl will point to the overload set 3356 // containing the two f's declared in X, but neither of them 3357 // matches. 3358 3359 // First check whether we named the global scope. 3360 if (isa<TranslationUnitDecl>(DC)) { 3361 Diag(D.getIdentifierLoc(), diag::err_invalid_declarator_global_scope) 3362 << Name << D.getCXXScopeSpec().getRange(); 3363 } else { 3364 DeclContext *Cur = CurContext; 3365 while (isa<LinkageSpecDecl>(Cur)) 3366 Cur = Cur->getParent(); 3367 if (!Cur->Encloses(DC)) { 3368 // The qualifying scope doesn't enclose the original declaration. 3369 // Emit diagnostic based on current scope. 3370 SourceLocation L = D.getIdentifierLoc(); 3371 SourceRange R = D.getCXXScopeSpec().getRange(); 3372 if (isa<FunctionDecl>(Cur)) 3373 Diag(L, diag::err_invalid_declarator_in_function) << Name << R; 3374 else 3375 Diag(L, diag::err_invalid_declarator_scope) 3376 << Name << cast<NamedDecl>(DC) << R; 3377 D.setInvalidType(); 3378 } 3379 3380 // C++11 8.3p1: 3381 // ... "The nested-name-specifier of the qualified declarator-id shall 3382 // not begin with a decltype-specifer" 3383 NestedNameSpecifierLoc SpecLoc = 3384 D.getCXXScopeSpec().getWithLocInContext(Context); 3385 assert(SpecLoc && "A non-empty CXXScopeSpec should have a non-empty " 3386 "NestedNameSpecifierLoc"); 3387 while (SpecLoc.getPrefix()) 3388 SpecLoc = SpecLoc.getPrefix(); 3389 if (dyn_cast_or_null<DecltypeType>( 3390 SpecLoc.getNestedNameSpecifier()->getAsType())) 3391 Diag(SpecLoc.getBeginLoc(), diag::err_decltype_in_declarator) 3392 << SpecLoc.getTypeLoc().getSourceRange(); 3393 } 3394 } 3395 3396 if (Previous.isSingleResult() && 3397 Previous.getFoundDecl()->isTemplateParameter()) { 3398 // Maybe we will complain about the shadowed template parameter. 3399 if (!D.isInvalidType()) 3400 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), 3401 Previous.getFoundDecl()); 3402 3403 // Just pretend that we didn't see the previous declaration. 3404 Previous.clear(); 3405 } 3406 3407 // In C++, the previous declaration we find might be a tag type 3408 // (class or enum). In this case, the new declaration will hide the 3409 // tag type. Note that this does does not apply if we're declaring a 3410 // typedef (C++ [dcl.typedef]p4). 3411 if (Previous.isSingleTagDecl() && 3412 D.getDeclSpec().getStorageClassSpec() != DeclSpec::SCS_typedef) 3413 Previous.clear(); 3414 3415 bool AddToScope = true; 3416 if (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_typedef) { 3417 if (TemplateParamLists.size()) { 3418 Diag(D.getIdentifierLoc(), diag::err_template_typedef); 3419 return 0; 3420 } 3421 3422 New = ActOnTypedefDeclarator(S, D, DC, TInfo, Previous); 3423 } else if (R->isFunctionType()) { 3424 New = ActOnFunctionDeclarator(S, D, DC, TInfo, Previous, 3425 move(TemplateParamLists), 3426 AddToScope); 3427 } else { 3428 New = ActOnVariableDeclarator(S, D, DC, TInfo, Previous, 3429 move(TemplateParamLists)); 3430 } 3431 3432 if (New == 0) 3433 return 0; 3434 3435 // If this has an identifier and is not an invalid redeclaration or 3436 // function template specialization, add it to the scope stack. 3437 if (New->getDeclName() && AddToScope && 3438 !(D.isRedeclaration() && New->isInvalidDecl())) 3439 PushOnScopeChains(New, S); 3440 3441 return New; 3442} 3443 3444/// TryToFixInvalidVariablyModifiedType - Helper method to turn variable array 3445/// types into constant array types in certain situations which would otherwise 3446/// be errors (for GCC compatibility). 3447static QualType TryToFixInvalidVariablyModifiedType(QualType T, 3448 ASTContext &Context, 3449 bool &SizeIsNegative, 3450 llvm::APSInt &Oversized) { 3451 // This method tries to turn a variable array into a constant 3452 // array even when the size isn't an ICE. This is necessary 3453 // for compatibility with code that depends on gcc's buggy 3454 // constant expression folding, like struct {char x[(int)(char*)2];} 3455 SizeIsNegative = false; 3456 Oversized = 0; 3457 3458 if (T->isDependentType()) 3459 return QualType(); 3460 3461 QualifierCollector Qs; 3462 const Type *Ty = Qs.strip(T); 3463 3464 if (const PointerType* PTy = dyn_cast<PointerType>(Ty)) { 3465 QualType Pointee = PTy->getPointeeType(); 3466 QualType FixedType = 3467 TryToFixInvalidVariablyModifiedType(Pointee, Context, SizeIsNegative, 3468 Oversized); 3469 if (FixedType.isNull()) return FixedType; 3470 FixedType = Context.getPointerType(FixedType); 3471 return Qs.apply(Context, FixedType); 3472 } 3473 if (const ParenType* PTy = dyn_cast<ParenType>(Ty)) { 3474 QualType Inner = PTy->getInnerType(); 3475 QualType FixedType = 3476 TryToFixInvalidVariablyModifiedType(Inner, Context, SizeIsNegative, 3477 Oversized); 3478 if (FixedType.isNull()) return FixedType; 3479 FixedType = Context.getParenType(FixedType); 3480 return Qs.apply(Context, FixedType); 3481 } 3482 3483 const VariableArrayType* VLATy = dyn_cast<VariableArrayType>(T); 3484 if (!VLATy) 3485 return QualType(); 3486 // FIXME: We should probably handle this case 3487 if (VLATy->getElementType()->isVariablyModifiedType()) 3488 return QualType(); 3489 3490 llvm::APSInt Res; 3491 if (!VLATy->getSizeExpr() || 3492 !VLATy->getSizeExpr()->EvaluateAsInt(Res, Context)) 3493 return QualType(); 3494 3495 // Check whether the array size is negative. 3496 if (Res.isSigned() && Res.isNegative()) { 3497 SizeIsNegative = true; 3498 return QualType(); 3499 } 3500 3501 // Check whether the array is too large to be addressed. 3502 unsigned ActiveSizeBits 3503 = ConstantArrayType::getNumAddressingBits(Context, VLATy->getElementType(), 3504 Res); 3505 if (ActiveSizeBits > ConstantArrayType::getMaxSizeBits(Context)) { 3506 Oversized = Res; 3507 return QualType(); 3508 } 3509 3510 return Context.getConstantArrayType(VLATy->getElementType(), 3511 Res, ArrayType::Normal, 0); 3512} 3513 3514/// \brief Register the given locally-scoped external C declaration so 3515/// that it can be found later for redeclarations 3516void 3517Sema::RegisterLocallyScopedExternCDecl(NamedDecl *ND, 3518 const LookupResult &Previous, 3519 Scope *S) { 3520 assert(ND->getLexicalDeclContext()->isFunctionOrMethod() && 3521 "Decl is not a locally-scoped decl!"); 3522 // Note that we have a locally-scoped external with this name. 3523 LocallyScopedExternalDecls[ND->getDeclName()] = ND; 3524 3525 if (!Previous.isSingleResult()) 3526 return; 3527 3528 NamedDecl *PrevDecl = Previous.getFoundDecl(); 3529 3530 // If there was a previous declaration of this variable, it may be 3531 // in our identifier chain. Update the identifier chain with the new 3532 // declaration. 3533 if (S && IdResolver.ReplaceDecl(PrevDecl, ND)) { 3534 // The previous declaration was found on the identifer resolver 3535 // chain, so remove it from its scope. 3536 3537 if (S->isDeclScope(PrevDecl)) { 3538 // Special case for redeclarations in the SAME scope. 3539 // Because this declaration is going to be added to the identifier chain 3540 // later, we should temporarily take it OFF the chain. 3541 IdResolver.RemoveDecl(ND); 3542 3543 } else { 3544 // Find the scope for the original declaration. 3545 while (S && !S->isDeclScope(PrevDecl)) 3546 S = S->getParent(); 3547 } 3548 3549 if (S) 3550 S->RemoveDecl(PrevDecl); 3551 } 3552} 3553 3554llvm::DenseMap<DeclarationName, NamedDecl *>::iterator 3555Sema::findLocallyScopedExternalDecl(DeclarationName Name) { 3556 if (ExternalSource) { 3557 // Load locally-scoped external decls from the external source. 3558 SmallVector<NamedDecl *, 4> Decls; 3559 ExternalSource->ReadLocallyScopedExternalDecls(Decls); 3560 for (unsigned I = 0, N = Decls.size(); I != N; ++I) { 3561 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 3562 = LocallyScopedExternalDecls.find(Decls[I]->getDeclName()); 3563 if (Pos == LocallyScopedExternalDecls.end()) 3564 LocallyScopedExternalDecls[Decls[I]->getDeclName()] = Decls[I]; 3565 } 3566 } 3567 3568 return LocallyScopedExternalDecls.find(Name); 3569} 3570 3571/// \brief Diagnose function specifiers on a declaration of an identifier that 3572/// does not identify a function. 3573void Sema::DiagnoseFunctionSpecifiers(Declarator& D) { 3574 // FIXME: We should probably indicate the identifier in question to avoid 3575 // confusion for constructs like "inline int a(), b;" 3576 if (D.getDeclSpec().isInlineSpecified()) 3577 Diag(D.getDeclSpec().getInlineSpecLoc(), 3578 diag::err_inline_non_function); 3579 3580 if (D.getDeclSpec().isVirtualSpecified()) 3581 Diag(D.getDeclSpec().getVirtualSpecLoc(), 3582 diag::err_virtual_non_function); 3583 3584 if (D.getDeclSpec().isExplicitSpecified()) 3585 Diag(D.getDeclSpec().getExplicitSpecLoc(), 3586 diag::err_explicit_non_function); 3587} 3588 3589NamedDecl* 3590Sema::ActOnTypedefDeclarator(Scope* S, Declarator& D, DeclContext* DC, 3591 TypeSourceInfo *TInfo, LookupResult &Previous) { 3592 // Typedef declarators cannot be qualified (C++ [dcl.meaning]p1). 3593 if (D.getCXXScopeSpec().isSet()) { 3594 Diag(D.getIdentifierLoc(), diag::err_qualified_typedef_declarator) 3595 << D.getCXXScopeSpec().getRange(); 3596 D.setInvalidType(); 3597 // Pretend we didn't see the scope specifier. 3598 DC = CurContext; 3599 Previous.clear(); 3600 } 3601 3602 if (getLangOptions().CPlusPlus) { 3603 // Check that there are no default arguments (C++ only). 3604 CheckExtraCXXDefaultArguments(D); 3605 } 3606 3607 DiagnoseFunctionSpecifiers(D); 3608 3609 if (D.getDeclSpec().isThreadSpecified()) 3610 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 3611 if (D.getDeclSpec().isConstexprSpecified()) 3612 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 3613 << 1; 3614 3615 if (D.getName().Kind != UnqualifiedId::IK_Identifier) { 3616 Diag(D.getName().StartLocation, diag::err_typedef_not_identifier) 3617 << D.getName().getSourceRange(); 3618 return 0; 3619 } 3620 3621 TypedefDecl *NewTD = ParseTypedefDecl(S, D, TInfo->getType(), TInfo); 3622 if (!NewTD) return 0; 3623 3624 // Handle attributes prior to checking for duplicates in MergeVarDecl 3625 ProcessDeclAttributes(S, NewTD, D); 3626 3627 CheckTypedefForVariablyModifiedType(S, NewTD); 3628 3629 bool Redeclaration = D.isRedeclaration(); 3630 NamedDecl *ND = ActOnTypedefNameDecl(S, DC, NewTD, Previous, Redeclaration); 3631 D.setRedeclaration(Redeclaration); 3632 return ND; 3633} 3634 3635void 3636Sema::CheckTypedefForVariablyModifiedType(Scope *S, TypedefNameDecl *NewTD) { 3637 // C99 6.7.7p2: If a typedef name specifies a variably modified type 3638 // then it shall have block scope. 3639 // Note that variably modified types must be fixed before merging the decl so 3640 // that redeclarations will match. 3641 QualType T = NewTD->getUnderlyingType(); 3642 if (T->isVariablyModifiedType()) { 3643 getCurFunction()->setHasBranchProtectedScope(); 3644 3645 if (S->getFnParent() == 0) { 3646 bool SizeIsNegative; 3647 llvm::APSInt Oversized; 3648 QualType FixedTy = 3649 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 3650 Oversized); 3651 if (!FixedTy.isNull()) { 3652 Diag(NewTD->getLocation(), diag::warn_illegal_constant_array_size); 3653 NewTD->setTypeSourceInfo(Context.getTrivialTypeSourceInfo(FixedTy)); 3654 } else { 3655 if (SizeIsNegative) 3656 Diag(NewTD->getLocation(), diag::err_typecheck_negative_array_size); 3657 else if (T->isVariableArrayType()) 3658 Diag(NewTD->getLocation(), diag::err_vla_decl_in_file_scope); 3659 else if (Oversized.getBoolValue()) 3660 Diag(NewTD->getLocation(), diag::err_array_too_large) 3661 << Oversized.toString(10); 3662 else 3663 Diag(NewTD->getLocation(), diag::err_vm_decl_in_file_scope); 3664 NewTD->setInvalidDecl(); 3665 } 3666 } 3667 } 3668} 3669 3670 3671/// ActOnTypedefNameDecl - Perform semantic checking for a declaration which 3672/// declares a typedef-name, either using the 'typedef' type specifier or via 3673/// a C++0x [dcl.typedef]p2 alias-declaration: 'using T = A;'. 3674NamedDecl* 3675Sema::ActOnTypedefNameDecl(Scope *S, DeclContext *DC, TypedefNameDecl *NewTD, 3676 LookupResult &Previous, bool &Redeclaration) { 3677 // Merge the decl with the existing one if appropriate. If the decl is 3678 // in an outer scope, it isn't the same thing. 3679 FilterLookupForScope(Previous, DC, S, /*ConsiderLinkage*/ false, 3680 /*ExplicitInstantiationOrSpecialization=*/false); 3681 if (!Previous.empty()) { 3682 Redeclaration = true; 3683 MergeTypedefNameDecl(NewTD, Previous); 3684 } 3685 3686 // If this is the C FILE type, notify the AST context. 3687 if (IdentifierInfo *II = NewTD->getIdentifier()) 3688 if (!NewTD->isInvalidDecl() && 3689 NewTD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 3690 if (II->isStr("FILE")) 3691 Context.setFILEDecl(NewTD); 3692 else if (II->isStr("jmp_buf")) 3693 Context.setjmp_bufDecl(NewTD); 3694 else if (II->isStr("sigjmp_buf")) 3695 Context.setsigjmp_bufDecl(NewTD); 3696 else if (II->isStr("ucontext_t")) 3697 Context.setucontext_tDecl(NewTD); 3698 else if (II->isStr("__builtin_va_list")) 3699 Context.setBuiltinVaListType(Context.getTypedefType(NewTD)); 3700 } 3701 3702 return NewTD; 3703} 3704 3705/// \brief Determines whether the given declaration is an out-of-scope 3706/// previous declaration. 3707/// 3708/// This routine should be invoked when name lookup has found a 3709/// previous declaration (PrevDecl) that is not in the scope where a 3710/// new declaration by the same name is being introduced. If the new 3711/// declaration occurs in a local scope, previous declarations with 3712/// linkage may still be considered previous declarations (C99 3713/// 6.2.2p4-5, C++ [basic.link]p6). 3714/// 3715/// \param PrevDecl the previous declaration found by name 3716/// lookup 3717/// 3718/// \param DC the context in which the new declaration is being 3719/// declared. 3720/// 3721/// \returns true if PrevDecl is an out-of-scope previous declaration 3722/// for a new delcaration with the same name. 3723static bool 3724isOutOfScopePreviousDeclaration(NamedDecl *PrevDecl, DeclContext *DC, 3725 ASTContext &Context) { 3726 if (!PrevDecl) 3727 return false; 3728 3729 if (!PrevDecl->hasLinkage()) 3730 return false; 3731 3732 if (Context.getLangOptions().CPlusPlus) { 3733 // C++ [basic.link]p6: 3734 // If there is a visible declaration of an entity with linkage 3735 // having the same name and type, ignoring entities declared 3736 // outside the innermost enclosing namespace scope, the block 3737 // scope declaration declares that same entity and receives the 3738 // linkage of the previous declaration. 3739 DeclContext *OuterContext = DC->getRedeclContext(); 3740 if (!OuterContext->isFunctionOrMethod()) 3741 // This rule only applies to block-scope declarations. 3742 return false; 3743 3744 DeclContext *PrevOuterContext = PrevDecl->getDeclContext(); 3745 if (PrevOuterContext->isRecord()) 3746 // We found a member function: ignore it. 3747 return false; 3748 3749 // Find the innermost enclosing namespace for the new and 3750 // previous declarations. 3751 OuterContext = OuterContext->getEnclosingNamespaceContext(); 3752 PrevOuterContext = PrevOuterContext->getEnclosingNamespaceContext(); 3753 3754 // The previous declaration is in a different namespace, so it 3755 // isn't the same function. 3756 if (!OuterContext->Equals(PrevOuterContext)) 3757 return false; 3758 } 3759 3760 return true; 3761} 3762 3763static void SetNestedNameSpecifier(DeclaratorDecl *DD, Declarator &D) { 3764 CXXScopeSpec &SS = D.getCXXScopeSpec(); 3765 if (!SS.isSet()) return; 3766 DD->setQualifierInfo(SS.getWithLocInContext(DD->getASTContext())); 3767} 3768 3769bool Sema::inferObjCARCLifetime(ValueDecl *decl) { 3770 QualType type = decl->getType(); 3771 Qualifiers::ObjCLifetime lifetime = type.getObjCLifetime(); 3772 if (lifetime == Qualifiers::OCL_Autoreleasing) { 3773 // Various kinds of declaration aren't allowed to be __autoreleasing. 3774 unsigned kind = -1U; 3775 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 3776 if (var->hasAttr<BlocksAttr>()) 3777 kind = 0; // __block 3778 else if (!var->hasLocalStorage()) 3779 kind = 1; // global 3780 } else if (isa<ObjCIvarDecl>(decl)) { 3781 kind = 3; // ivar 3782 } else if (isa<FieldDecl>(decl)) { 3783 kind = 2; // field 3784 } 3785 3786 if (kind != -1U) { 3787 Diag(decl->getLocation(), diag::err_arc_autoreleasing_var) 3788 << kind; 3789 } 3790 } else if (lifetime == Qualifiers::OCL_None) { 3791 // Try to infer lifetime. 3792 if (!type->isObjCLifetimeType()) 3793 return false; 3794 3795 lifetime = type->getObjCARCImplicitLifetime(); 3796 type = Context.getLifetimeQualifiedType(type, lifetime); 3797 decl->setType(type); 3798 } 3799 3800 if (VarDecl *var = dyn_cast<VarDecl>(decl)) { 3801 // Thread-local variables cannot have lifetime. 3802 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone && 3803 var->isThreadSpecified()) { 3804 Diag(var->getLocation(), diag::err_arc_thread_ownership) 3805 << var->getType(); 3806 return true; 3807 } 3808 } 3809 3810 return false; 3811} 3812 3813NamedDecl* 3814Sema::ActOnVariableDeclarator(Scope *S, Declarator &D, DeclContext *DC, 3815 TypeSourceInfo *TInfo, LookupResult &Previous, 3816 MultiTemplateParamsArg TemplateParamLists) { 3817 QualType R = TInfo->getType(); 3818 DeclarationName Name = GetNameForDeclarator(D).getName(); 3819 3820 // Check that there are no default arguments (C++ only). 3821 if (getLangOptions().CPlusPlus) 3822 CheckExtraCXXDefaultArguments(D); 3823 3824 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpec(); 3825 assert(SCSpec != DeclSpec::SCS_typedef && 3826 "Parser allowed 'typedef' as storage class VarDecl."); 3827 VarDecl::StorageClass SC = StorageClassSpecToVarDeclStorageClass(SCSpec); 3828 if (SCSpec == DeclSpec::SCS_mutable) { 3829 // mutable can only appear on non-static class members, so it's always 3830 // an error here 3831 Diag(D.getIdentifierLoc(), diag::err_mutable_nonmember); 3832 D.setInvalidType(); 3833 SC = SC_None; 3834 } 3835 SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 3836 VarDecl::StorageClass SCAsWritten 3837 = StorageClassSpecToVarDeclStorageClass(SCSpec); 3838 3839 IdentifierInfo *II = Name.getAsIdentifierInfo(); 3840 if (!II) { 3841 Diag(D.getIdentifierLoc(), diag::err_bad_variable_name) 3842 << Name; 3843 return 0; 3844 } 3845 3846 DiagnoseFunctionSpecifiers(D); 3847 3848 if (!DC->isRecord() && S->getFnParent() == 0) { 3849 // C99 6.9p2: The storage-class specifiers auto and register shall not 3850 // appear in the declaration specifiers in an external declaration. 3851 if (SC == SC_Auto || SC == SC_Register) { 3852 3853 // If this is a register variable with an asm label specified, then this 3854 // is a GNU extension. 3855 if (SC == SC_Register && D.getAsmLabel()) 3856 Diag(D.getIdentifierLoc(), diag::err_unsupported_global_register); 3857 else 3858 Diag(D.getIdentifierLoc(), diag::err_typecheck_sclass_fscope); 3859 D.setInvalidType(); 3860 } 3861 } 3862 3863 if (getLangOptions().OpenCL) { 3864 // Set up the special work-group-local storage class for variables in the 3865 // OpenCL __local address space. 3866 if (R.getAddressSpace() == LangAS::opencl_local) 3867 SC = SC_OpenCLWorkGroupLocal; 3868 } 3869 3870 bool isExplicitSpecialization = false; 3871 VarDecl *NewVD; 3872 if (!getLangOptions().CPlusPlus) { 3873 NewVD = VarDecl::Create(Context, DC, D.getSourceRange().getBegin(), 3874 D.getIdentifierLoc(), II, 3875 R, TInfo, SC, SCAsWritten); 3876 3877 if (D.isInvalidType()) 3878 NewVD->setInvalidDecl(); 3879 } else { 3880 if (DC->isRecord() && !CurContext->isRecord()) { 3881 // This is an out-of-line definition of a static data member. 3882 if (SC == SC_Static) { 3883 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 3884 diag::err_static_out_of_line) 3885 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 3886 } else if (SC == SC_None) 3887 SC = SC_Static; 3888 } 3889 if (SC == SC_Static) { 3890 if (const CXXRecordDecl *RD = dyn_cast<CXXRecordDecl>(DC)) { 3891 if (RD->isLocalClass()) 3892 Diag(D.getIdentifierLoc(), 3893 diag::err_static_data_member_not_allowed_in_local_class) 3894 << Name << RD->getDeclName(); 3895 3896 // C++ [class.union]p1: If a union contains a static data member, 3897 // the program is ill-formed. 3898 // 3899 // We also disallow static data members in anonymous structs. 3900 if (CurContext->isRecord() && (RD->isUnion() || !RD->getDeclName())) 3901 Diag(D.getIdentifierLoc(), 3902 diag::err_static_data_member_not_allowed_in_union_or_anon_struct) 3903 << Name << RD->isUnion(); 3904 } 3905 } 3906 3907 // Match up the template parameter lists with the scope specifier, then 3908 // determine whether we have a template or a template specialization. 3909 isExplicitSpecialization = false; 3910 bool Invalid = false; 3911 if (TemplateParameterList *TemplateParams 3912 = MatchTemplateParametersToScopeSpecifier( 3913 D.getDeclSpec().getSourceRange().getBegin(), 3914 D.getIdentifierLoc(), 3915 D.getCXXScopeSpec(), 3916 TemplateParamLists.get(), 3917 TemplateParamLists.size(), 3918 /*never a friend*/ false, 3919 isExplicitSpecialization, 3920 Invalid)) { 3921 if (TemplateParams->size() > 0) { 3922 // There is no such thing as a variable template. 3923 Diag(D.getIdentifierLoc(), diag::err_template_variable) 3924 << II 3925 << SourceRange(TemplateParams->getTemplateLoc(), 3926 TemplateParams->getRAngleLoc()); 3927 return 0; 3928 } else { 3929 // There is an extraneous 'template<>' for this variable. Complain 3930 // about it, but allow the declaration of the variable. 3931 Diag(TemplateParams->getTemplateLoc(), 3932 diag::err_template_variable_noparams) 3933 << II 3934 << SourceRange(TemplateParams->getTemplateLoc(), 3935 TemplateParams->getRAngleLoc()); 3936 } 3937 } 3938 3939 NewVD = VarDecl::Create(Context, DC, D.getSourceRange().getBegin(), 3940 D.getIdentifierLoc(), II, 3941 R, TInfo, SC, SCAsWritten); 3942 3943 // If this decl has an auto type in need of deduction, make a note of the 3944 // Decl so we can diagnose uses of it in its own initializer. 3945 if (D.getDeclSpec().getTypeSpecType() == DeclSpec::TST_auto && 3946 R->getContainedAutoType()) 3947 ParsingInitForAutoVars.insert(NewVD); 3948 3949 if (D.isInvalidType() || Invalid) 3950 NewVD->setInvalidDecl(); 3951 3952 SetNestedNameSpecifier(NewVD, D); 3953 3954 if (TemplateParamLists.size() > 0 && D.getCXXScopeSpec().isSet()) { 3955 NewVD->setTemplateParameterListsInfo(Context, 3956 TemplateParamLists.size(), 3957 TemplateParamLists.release()); 3958 } 3959 3960 if (D.getDeclSpec().isConstexprSpecified()) 3961 NewVD->setConstexpr(true); 3962 } 3963 3964 // Set the lexical context. If the declarator has a C++ scope specifier, the 3965 // lexical context will be different from the semantic context. 3966 NewVD->setLexicalDeclContext(CurContext); 3967 3968 if (D.getDeclSpec().isThreadSpecified()) { 3969 if (NewVD->hasLocalStorage()) 3970 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_non_global); 3971 else if (!Context.getTargetInfo().isTLSSupported()) 3972 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_thread_unsupported); 3973 else 3974 NewVD->setThreadSpecified(true); 3975 } 3976 3977 if (D.getDeclSpec().isModulePrivateSpecified()) { 3978 if (isExplicitSpecialization) 3979 Diag(NewVD->getLocation(), diag::err_module_private_specialization) 3980 << 2 3981 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 3982 else if (NewVD->hasLocalStorage()) 3983 Diag(NewVD->getLocation(), diag::err_module_private_local) 3984 << 0 << NewVD->getDeclName() 3985 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 3986 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 3987 else 3988 NewVD->setModulePrivate(); 3989 } 3990 3991 // Handle attributes prior to checking for duplicates in MergeVarDecl 3992 ProcessDeclAttributes(S, NewVD, D); 3993 3994 // In auto-retain/release, infer strong retension for variables of 3995 // retainable type. 3996 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewVD)) 3997 NewVD->setInvalidDecl(); 3998 3999 // Handle GNU asm-label extension (encoded as an attribute). 4000 if (Expr *E = (Expr*)D.getAsmLabel()) { 4001 // The parser guarantees this is a string. 4002 StringLiteral *SE = cast<StringLiteral>(E); 4003 StringRef Label = SE->getString(); 4004 if (S->getFnParent() != 0) { 4005 switch (SC) { 4006 case SC_None: 4007 case SC_Auto: 4008 Diag(E->getExprLoc(), diag::warn_asm_label_on_auto_decl) << Label; 4009 break; 4010 case SC_Register: 4011 if (!Context.getTargetInfo().isValidGCCRegisterName(Label)) 4012 Diag(E->getExprLoc(), diag::err_asm_unknown_register_name) << Label; 4013 break; 4014 case SC_Static: 4015 case SC_Extern: 4016 case SC_PrivateExtern: 4017 case SC_OpenCLWorkGroupLocal: 4018 break; 4019 } 4020 } 4021 4022 NewVD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), 4023 Context, Label)); 4024 } 4025 4026 // Diagnose shadowed variables before filtering for scope. 4027 if (!D.getCXXScopeSpec().isSet()) 4028 CheckShadow(S, NewVD, Previous); 4029 4030 // Don't consider existing declarations that are in a different 4031 // scope and are out-of-semantic-context declarations (if the new 4032 // declaration has linkage). 4033 FilterLookupForScope(Previous, DC, S, NewVD->hasLinkage(), 4034 isExplicitSpecialization); 4035 4036 if (!getLangOptions().CPlusPlus) { 4037 D.setRedeclaration(CheckVariableDeclaration(NewVD, Previous)); 4038 } else { 4039 // Merge the decl with the existing one if appropriate. 4040 if (!Previous.empty()) { 4041 if (Previous.isSingleResult() && 4042 isa<FieldDecl>(Previous.getFoundDecl()) && 4043 D.getCXXScopeSpec().isSet()) { 4044 // The user tried to define a non-static data member 4045 // out-of-line (C++ [dcl.meaning]p1). 4046 Diag(NewVD->getLocation(), diag::err_nonstatic_member_out_of_line) 4047 << D.getCXXScopeSpec().getRange(); 4048 Previous.clear(); 4049 NewVD->setInvalidDecl(); 4050 } 4051 } else if (D.getCXXScopeSpec().isSet()) { 4052 // No previous declaration in the qualifying scope. 4053 Diag(D.getIdentifierLoc(), diag::err_no_member) 4054 << Name << computeDeclContext(D.getCXXScopeSpec(), true) 4055 << D.getCXXScopeSpec().getRange(); 4056 NewVD->setInvalidDecl(); 4057 } 4058 4059 D.setRedeclaration(CheckVariableDeclaration(NewVD, Previous)); 4060 4061 // This is an explicit specialization of a static data member. Check it. 4062 if (isExplicitSpecialization && !NewVD->isInvalidDecl() && 4063 CheckMemberSpecialization(NewVD, Previous)) 4064 NewVD->setInvalidDecl(); 4065 } 4066 4067 // attributes declared post-definition are currently ignored 4068 // FIXME: This should be handled in attribute merging, not 4069 // here. 4070 if (Previous.isSingleResult()) { 4071 VarDecl *Def = dyn_cast<VarDecl>(Previous.getFoundDecl()); 4072 if (Def && (Def = Def->getDefinition()) && 4073 Def != NewVD && D.hasAttributes()) { 4074 Diag(NewVD->getLocation(), diag::warn_attribute_precede_definition); 4075 Diag(Def->getLocation(), diag::note_previous_definition); 4076 } 4077 } 4078 4079 // If this is a locally-scoped extern C variable, update the map of 4080 // such variables. 4081 if (CurContext->isFunctionOrMethod() && NewVD->isExternC() && 4082 !NewVD->isInvalidDecl()) 4083 RegisterLocallyScopedExternCDecl(NewVD, Previous, S); 4084 4085 // If there's a #pragma GCC visibility in scope, and this isn't a class 4086 // member, set the visibility of this variable. 4087 if (NewVD->getLinkage() == ExternalLinkage && !DC->isRecord()) 4088 AddPushedVisibilityAttribute(NewVD); 4089 4090 MarkUnusedFileScopedDecl(NewVD); 4091 4092 return NewVD; 4093} 4094 4095/// \brief Diagnose variable or built-in function shadowing. Implements 4096/// -Wshadow. 4097/// 4098/// This method is called whenever a VarDecl is added to a "useful" 4099/// scope. 4100/// 4101/// \param S the scope in which the shadowing name is being declared 4102/// \param R the lookup of the name 4103/// 4104void Sema::CheckShadow(Scope *S, VarDecl *D, const LookupResult& R) { 4105 // Return if warning is ignored. 4106 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, R.getNameLoc()) == 4107 DiagnosticsEngine::Ignored) 4108 return; 4109 4110 // Don't diagnose declarations at file scope. 4111 if (D->hasGlobalStorage()) 4112 return; 4113 4114 DeclContext *NewDC = D->getDeclContext(); 4115 4116 // Only diagnose if we're shadowing an unambiguous field or variable. 4117 if (R.getResultKind() != LookupResult::Found) 4118 return; 4119 4120 NamedDecl* ShadowedDecl = R.getFoundDecl(); 4121 if (!isa<VarDecl>(ShadowedDecl) && !isa<FieldDecl>(ShadowedDecl)) 4122 return; 4123 4124 // Fields are not shadowed by variables in C++ static methods. 4125 if (isa<FieldDecl>(ShadowedDecl)) 4126 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(NewDC)) 4127 if (MD->isStatic()) 4128 return; 4129 4130 if (VarDecl *shadowedVar = dyn_cast<VarDecl>(ShadowedDecl)) 4131 if (shadowedVar->isExternC()) { 4132 // For shadowing external vars, make sure that we point to the global 4133 // declaration, not a locally scoped extern declaration. 4134 for (VarDecl::redecl_iterator 4135 I = shadowedVar->redecls_begin(), E = shadowedVar->redecls_end(); 4136 I != E; ++I) 4137 if (I->isFileVarDecl()) { 4138 ShadowedDecl = *I; 4139 break; 4140 } 4141 } 4142 4143 DeclContext *OldDC = ShadowedDecl->getDeclContext(); 4144 4145 // Only warn about certain kinds of shadowing for class members. 4146 if (NewDC && NewDC->isRecord()) { 4147 // In particular, don't warn about shadowing non-class members. 4148 if (!OldDC->isRecord()) 4149 return; 4150 4151 // TODO: should we warn about static data members shadowing 4152 // static data members from base classes? 4153 4154 // TODO: don't diagnose for inaccessible shadowed members. 4155 // This is hard to do perfectly because we might friend the 4156 // shadowing context, but that's just a false negative. 4157 } 4158 4159 // Determine what kind of declaration we're shadowing. 4160 unsigned Kind; 4161 if (isa<RecordDecl>(OldDC)) { 4162 if (isa<FieldDecl>(ShadowedDecl)) 4163 Kind = 3; // field 4164 else 4165 Kind = 2; // static data member 4166 } else if (OldDC->isFileContext()) 4167 Kind = 1; // global 4168 else 4169 Kind = 0; // local 4170 4171 DeclarationName Name = R.getLookupName(); 4172 4173 // Emit warning and note. 4174 Diag(R.getNameLoc(), diag::warn_decl_shadow) << Name << Kind << OldDC; 4175 Diag(ShadowedDecl->getLocation(), diag::note_previous_declaration); 4176} 4177 4178/// \brief Check -Wshadow without the advantage of a previous lookup. 4179void Sema::CheckShadow(Scope *S, VarDecl *D) { 4180 if (Diags.getDiagnosticLevel(diag::warn_decl_shadow, D->getLocation()) == 4181 DiagnosticsEngine::Ignored) 4182 return; 4183 4184 LookupResult R(*this, D->getDeclName(), D->getLocation(), 4185 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4186 LookupName(R, S); 4187 CheckShadow(S, D, R); 4188} 4189 4190/// \brief Perform semantic checking on a newly-created variable 4191/// declaration. 4192/// 4193/// This routine performs all of the type-checking required for a 4194/// variable declaration once it has been built. It is used both to 4195/// check variables after they have been parsed and their declarators 4196/// have been translated into a declaration, and to check variables 4197/// that have been instantiated from a template. 4198/// 4199/// Sets NewVD->isInvalidDecl() if an error was encountered. 4200/// 4201/// Returns true if the variable declaration is a redeclaration. 4202bool Sema::CheckVariableDeclaration(VarDecl *NewVD, 4203 LookupResult &Previous) { 4204 // If the decl is already known invalid, don't check it. 4205 if (NewVD->isInvalidDecl()) 4206 return false; 4207 4208 QualType T = NewVD->getType(); 4209 4210 if (T->isObjCObjectType()) { 4211 Diag(NewVD->getLocation(), diag::err_statically_allocated_object) 4212 << FixItHint::CreateInsertion(NewVD->getLocation(), "*"); 4213 T = Context.getObjCObjectPointerType(T); 4214 NewVD->setType(T); 4215 } 4216 4217 // Emit an error if an address space was applied to decl with local storage. 4218 // This includes arrays of objects with address space qualifiers, but not 4219 // automatic variables that point to other address spaces. 4220 // ISO/IEC TR 18037 S5.1.2 4221 if (NewVD->hasLocalStorage() && T.getAddressSpace() != 0) { 4222 Diag(NewVD->getLocation(), diag::err_as_qualified_auto_decl); 4223 NewVD->setInvalidDecl(); 4224 return false; 4225 } 4226 4227 if (NewVD->hasLocalStorage() && T.isObjCGCWeak() 4228 && !NewVD->hasAttr<BlocksAttr>()) { 4229 if (getLangOptions().getGC() != LangOptions::NonGC) 4230 Diag(NewVD->getLocation(), diag::warn_gc_attribute_weak_on_local); 4231 else 4232 Diag(NewVD->getLocation(), diag::warn_attribute_weak_on_local); 4233 } 4234 4235 bool isVM = T->isVariablyModifiedType(); 4236 if (isVM || NewVD->hasAttr<CleanupAttr>() || 4237 NewVD->hasAttr<BlocksAttr>()) 4238 getCurFunction()->setHasBranchProtectedScope(); 4239 4240 if ((isVM && NewVD->hasLinkage()) || 4241 (T->isVariableArrayType() && NewVD->hasGlobalStorage())) { 4242 bool SizeIsNegative; 4243 llvm::APSInt Oversized; 4244 QualType FixedTy = 4245 TryToFixInvalidVariablyModifiedType(T, Context, SizeIsNegative, 4246 Oversized); 4247 4248 if (FixedTy.isNull() && T->isVariableArrayType()) { 4249 const VariableArrayType *VAT = Context.getAsVariableArrayType(T); 4250 // FIXME: This won't give the correct result for 4251 // int a[10][n]; 4252 SourceRange SizeRange = VAT->getSizeExpr()->getSourceRange(); 4253 4254 if (NewVD->isFileVarDecl()) 4255 Diag(NewVD->getLocation(), diag::err_vla_decl_in_file_scope) 4256 << SizeRange; 4257 else if (NewVD->getStorageClass() == SC_Static) 4258 Diag(NewVD->getLocation(), diag::err_vla_decl_has_static_storage) 4259 << SizeRange; 4260 else 4261 Diag(NewVD->getLocation(), diag::err_vla_decl_has_extern_linkage) 4262 << SizeRange; 4263 NewVD->setInvalidDecl(); 4264 return false; 4265 } 4266 4267 if (FixedTy.isNull()) { 4268 if (NewVD->isFileVarDecl()) 4269 Diag(NewVD->getLocation(), diag::err_vm_decl_in_file_scope); 4270 else 4271 Diag(NewVD->getLocation(), diag::err_vm_decl_has_extern_linkage); 4272 NewVD->setInvalidDecl(); 4273 return false; 4274 } 4275 4276 Diag(NewVD->getLocation(), diag::warn_illegal_constant_array_size); 4277 NewVD->setType(FixedTy); 4278 } 4279 4280 if (Previous.empty() && NewVD->isExternC()) { 4281 // Since we did not find anything by this name and we're declaring 4282 // an extern "C" variable, look for a non-visible extern "C" 4283 // declaration with the same name. 4284 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 4285 = findLocallyScopedExternalDecl(NewVD->getDeclName()); 4286 if (Pos != LocallyScopedExternalDecls.end()) 4287 Previous.addDecl(Pos->second); 4288 } 4289 4290 if (T->isVoidType() && !NewVD->hasExternalStorage()) { 4291 Diag(NewVD->getLocation(), diag::err_typecheck_decl_incomplete_type) 4292 << T; 4293 NewVD->setInvalidDecl(); 4294 return false; 4295 } 4296 4297 if (!NewVD->hasLocalStorage() && NewVD->hasAttr<BlocksAttr>()) { 4298 Diag(NewVD->getLocation(), diag::err_block_on_nonlocal); 4299 NewVD->setInvalidDecl(); 4300 return false; 4301 } 4302 4303 if (isVM && NewVD->hasAttr<BlocksAttr>()) { 4304 Diag(NewVD->getLocation(), diag::err_block_on_vm); 4305 NewVD->setInvalidDecl(); 4306 return false; 4307 } 4308 4309 // Function pointers and references cannot have qualified function type, only 4310 // function pointer-to-members can do that. 4311 QualType Pointee; 4312 unsigned PtrOrRef = 0; 4313 if (const PointerType *Ptr = T->getAs<PointerType>()) 4314 Pointee = Ptr->getPointeeType(); 4315 else if (const ReferenceType *Ref = T->getAs<ReferenceType>()) { 4316 Pointee = Ref->getPointeeType(); 4317 PtrOrRef = 1; 4318 } 4319 if (!Pointee.isNull() && Pointee->isFunctionProtoType() && 4320 Pointee->getAs<FunctionProtoType>()->getTypeQuals() != 0) { 4321 Diag(NewVD->getLocation(), diag::err_invalid_qualified_function_pointer) 4322 << PtrOrRef; 4323 NewVD->setInvalidDecl(); 4324 return false; 4325 } 4326 4327 if (!Previous.empty()) { 4328 MergeVarDecl(NewVD, Previous); 4329 return true; 4330 } 4331 return false; 4332} 4333 4334/// \brief Data used with FindOverriddenMethod 4335struct FindOverriddenMethodData { 4336 Sema *S; 4337 CXXMethodDecl *Method; 4338}; 4339 4340/// \brief Member lookup function that determines whether a given C++ 4341/// method overrides a method in a base class, to be used with 4342/// CXXRecordDecl::lookupInBases(). 4343static bool FindOverriddenMethod(const CXXBaseSpecifier *Specifier, 4344 CXXBasePath &Path, 4345 void *UserData) { 4346 RecordDecl *BaseRecord = Specifier->getType()->getAs<RecordType>()->getDecl(); 4347 4348 FindOverriddenMethodData *Data 4349 = reinterpret_cast<FindOverriddenMethodData*>(UserData); 4350 4351 DeclarationName Name = Data->Method->getDeclName(); 4352 4353 // FIXME: Do we care about other names here too? 4354 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4355 // We really want to find the base class destructor here. 4356 QualType T = Data->S->Context.getTypeDeclType(BaseRecord); 4357 CanQualType CT = Data->S->Context.getCanonicalType(T); 4358 4359 Name = Data->S->Context.DeclarationNames.getCXXDestructorName(CT); 4360 } 4361 4362 for (Path.Decls = BaseRecord->lookup(Name); 4363 Path.Decls.first != Path.Decls.second; 4364 ++Path.Decls.first) { 4365 NamedDecl *D = *Path.Decls.first; 4366 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) { 4367 if (MD->isVirtual() && !Data->S->IsOverload(Data->Method, MD, false)) 4368 return true; 4369 } 4370 } 4371 4372 return false; 4373} 4374 4375/// AddOverriddenMethods - See if a method overrides any in the base classes, 4376/// and if so, check that it's a valid override and remember it. 4377bool Sema::AddOverriddenMethods(CXXRecordDecl *DC, CXXMethodDecl *MD) { 4378 // Look for virtual methods in base classes that this method might override. 4379 CXXBasePaths Paths; 4380 FindOverriddenMethodData Data; 4381 Data.Method = MD; 4382 Data.S = this; 4383 bool AddedAny = false; 4384 if (DC->lookupInBases(&FindOverriddenMethod, &Data, Paths)) { 4385 for (CXXBasePaths::decl_iterator I = Paths.found_decls_begin(), 4386 E = Paths.found_decls_end(); I != E; ++I) { 4387 if (CXXMethodDecl *OldMD = dyn_cast<CXXMethodDecl>(*I)) { 4388 MD->addOverriddenMethod(OldMD->getCanonicalDecl()); 4389 if (!CheckOverridingFunctionReturnType(MD, OldMD) && 4390 !CheckOverridingFunctionExceptionSpec(MD, OldMD) && 4391 !CheckIfOverriddenFunctionIsMarkedFinal(MD, OldMD)) { 4392 AddedAny = true; 4393 } 4394 } 4395 } 4396 } 4397 4398 return AddedAny; 4399} 4400 4401namespace { 4402 // Struct for holding all of the extra arguments needed by 4403 // DiagnoseInvalidRedeclaration to call Sema::ActOnFunctionDeclarator. 4404 struct ActOnFDArgs { 4405 Scope *S; 4406 Declarator &D; 4407 MultiTemplateParamsArg TemplateParamLists; 4408 bool AddToScope; 4409 }; 4410} 4411 4412/// \brief Generate diagnostics for an invalid function redeclaration. 4413/// 4414/// This routine handles generating the diagnostic messages for an invalid 4415/// function redeclaration, including finding possible similar declarations 4416/// or performing typo correction if there are no previous declarations with 4417/// the same name. 4418/// 4419/// Returns a NamedDecl iff typo correction was performed and substituting in 4420/// the new declaration name does not cause new errors. 4421static NamedDecl* DiagnoseInvalidRedeclaration( 4422 Sema &SemaRef, LookupResult &Previous, FunctionDecl *NewFD, 4423 ActOnFDArgs &ExtraArgs) { 4424 NamedDecl *Result = NULL; 4425 DeclarationName Name = NewFD->getDeclName(); 4426 DeclContext *NewDC = NewFD->getDeclContext(); 4427 LookupResult Prev(SemaRef, Name, NewFD->getLocation(), 4428 Sema::LookupOrdinaryName, Sema::ForRedeclaration); 4429 llvm::SmallVector<unsigned, 1> MismatchedParams; 4430 llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1> NearMatches; 4431 TypoCorrection Correction; 4432 bool isFriendDecl = (SemaRef.getLangOptions().CPlusPlus && 4433 ExtraArgs.D.getDeclSpec().isFriendSpecified()); 4434 unsigned DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend 4435 : diag::err_member_def_does_not_match; 4436 4437 NewFD->setInvalidDecl(); 4438 SemaRef.LookupQualifiedName(Prev, NewDC); 4439 assert(!Prev.isAmbiguous() && 4440 "Cannot have an ambiguity in previous-declaration lookup"); 4441 if (!Prev.empty()) { 4442 for (LookupResult::iterator Func = Prev.begin(), FuncEnd = Prev.end(); 4443 Func != FuncEnd; ++Func) { 4444 FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func); 4445 if (FD && 4446 hasSimilarParameters(SemaRef.Context, FD, NewFD, MismatchedParams)) { 4447 // Add 1 to the index so that 0 can mean the mismatch didn't 4448 // involve a parameter 4449 unsigned ParamNum = 4450 MismatchedParams.empty() ? 0 : MismatchedParams.front() + 1; 4451 NearMatches.push_back(std::make_pair(FD, ParamNum)); 4452 } 4453 } 4454 // If the qualified name lookup yielded nothing, try typo correction 4455 } else if ((Correction = SemaRef.CorrectTypo(Prev.getLookupNameInfo(), 4456 Prev.getLookupKind(), 0, 0, NewDC)) && 4457 Correction.getCorrection() != Name) { 4458 // Trap errors. 4459 Sema::SFINAETrap Trap(SemaRef); 4460 4461 // Set up everything for the call to ActOnFunctionDeclarator 4462 ExtraArgs.D.SetIdentifier(Correction.getCorrectionAsIdentifierInfo(), 4463 ExtraArgs.D.getIdentifierLoc()); 4464 Previous.clear(); 4465 Previous.setLookupName(Correction.getCorrection()); 4466 for (TypoCorrection::decl_iterator CDecl = Correction.begin(), 4467 CDeclEnd = Correction.end(); 4468 CDecl != CDeclEnd; ++CDecl) { 4469 FunctionDecl *FD = dyn_cast<FunctionDecl>(*CDecl); 4470 if (FD && hasSimilarParameters(SemaRef.Context, FD, NewFD, 4471 MismatchedParams)) { 4472 Previous.addDecl(FD); 4473 } 4474 } 4475 bool wasRedeclaration = ExtraArgs.D.isRedeclaration(); 4476 // TODO: Refactor ActOnFunctionDeclarator so that we can call only the 4477 // pieces need to verify the typo-corrected C++ declaraction and hopefully 4478 // eliminate the need for the parameter pack ExtraArgs. 4479 Result = SemaRef.ActOnFunctionDeclarator(ExtraArgs.S, ExtraArgs.D, 4480 NewFD->getDeclContext(), 4481 NewFD->getTypeSourceInfo(), 4482 Previous, 4483 ExtraArgs.TemplateParamLists, 4484 ExtraArgs.AddToScope); 4485 if (Trap.hasErrorOccurred()) { 4486 // Pretend the typo correction never occurred 4487 ExtraArgs.D.SetIdentifier(Name.getAsIdentifierInfo(), 4488 ExtraArgs.D.getIdentifierLoc()); 4489 ExtraArgs.D.setRedeclaration(wasRedeclaration); 4490 Previous.clear(); 4491 Previous.setLookupName(Name); 4492 Result = NULL; 4493 } else { 4494 for (LookupResult::iterator Func = Previous.begin(), 4495 FuncEnd = Previous.end(); 4496 Func != FuncEnd; ++Func) { 4497 if (FunctionDecl *FD = dyn_cast<FunctionDecl>(*Func)) 4498 NearMatches.push_back(std::make_pair(FD, 0)); 4499 } 4500 } 4501 if (NearMatches.empty()) { 4502 // Ignore the correction if it didn't yield any close FunctionDecl matches 4503 Correction = TypoCorrection(); 4504 } else { 4505 DiagMsg = isFriendDecl ? diag::err_no_matching_local_friend_suggest 4506 : diag::err_member_def_does_not_match_suggest; 4507 } 4508 } 4509 4510 if (Correction) 4511 SemaRef.Diag(NewFD->getLocation(), DiagMsg) 4512 << Name << NewDC << Correction.getQuoted(SemaRef.getLangOptions()) 4513 << FixItHint::CreateReplacement( 4514 NewFD->getLocation(), 4515 Correction.getAsString(SemaRef.getLangOptions())); 4516 else 4517 SemaRef.Diag(NewFD->getLocation(), DiagMsg) 4518 << Name << NewDC << NewFD->getLocation(); 4519 4520 bool NewFDisConst = false; 4521 if (CXXMethodDecl *NewMD = dyn_cast<CXXMethodDecl>(NewFD)) 4522 NewFDisConst = NewMD->getTypeQualifiers() & Qualifiers::Const; 4523 4524 for (llvm::SmallVector<std::pair<FunctionDecl*, unsigned>, 1>::iterator 4525 NearMatch = NearMatches.begin(), NearMatchEnd = NearMatches.end(); 4526 NearMatch != NearMatchEnd; ++NearMatch) { 4527 FunctionDecl *FD = NearMatch->first; 4528 bool FDisConst = false; 4529 if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(FD)) 4530 FDisConst = MD->getTypeQualifiers() & Qualifiers::Const; 4531 4532 if (unsigned Idx = NearMatch->second) { 4533 ParmVarDecl *FDParam = FD->getParamDecl(Idx-1); 4534 SemaRef.Diag(FDParam->getTypeSpecStartLoc(), 4535 diag::note_member_def_close_param_match) 4536 << Idx << FDParam->getType() << NewFD->getParamDecl(Idx-1)->getType(); 4537 } else if (Correction) { 4538 SemaRef.Diag(FD->getLocation(), diag::note_previous_decl) 4539 << Correction.getQuoted(SemaRef.getLangOptions()); 4540 } else if (FDisConst != NewFDisConst) { 4541 SemaRef.Diag(FD->getLocation(), diag::note_member_def_close_const_match) 4542 << NewFDisConst << FD->getSourceRange().getEnd(); 4543 } else 4544 SemaRef.Diag(FD->getLocation(), diag::note_member_def_close_match); 4545 } 4546 return Result; 4547} 4548 4549static FunctionDecl::StorageClass getFunctionStorageClass(Sema &SemaRef, 4550 Declarator &D) { 4551 switch (D.getDeclSpec().getStorageClassSpec()) { 4552 default: llvm_unreachable("Unknown storage class!"); 4553 case DeclSpec::SCS_auto: 4554 case DeclSpec::SCS_register: 4555 case DeclSpec::SCS_mutable: 4556 SemaRef.Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4557 diag::err_typecheck_sclass_func); 4558 D.setInvalidType(); 4559 break; 4560 case DeclSpec::SCS_unspecified: break; 4561 case DeclSpec::SCS_extern: return SC_Extern; 4562 case DeclSpec::SCS_static: { 4563 if (SemaRef.CurContext->getRedeclContext()->isFunctionOrMethod()) { 4564 // C99 6.7.1p5: 4565 // The declaration of an identifier for a function that has 4566 // block scope shall have no explicit storage-class specifier 4567 // other than extern 4568 // See also (C++ [dcl.stc]p4). 4569 SemaRef.Diag(D.getDeclSpec().getStorageClassSpecLoc(), 4570 diag::err_static_block_func); 4571 break; 4572 } else 4573 return SC_Static; 4574 } 4575 case DeclSpec::SCS_private_extern: return SC_PrivateExtern; 4576 } 4577 4578 // No explicit storage class has already been returned 4579 return SC_None; 4580} 4581 4582static FunctionDecl* CreateNewFunctionDecl(Sema &SemaRef, Declarator &D, 4583 DeclContext *DC, QualType &R, 4584 TypeSourceInfo *TInfo, 4585 FunctionDecl::StorageClass SC, 4586 bool &IsVirtualOkay) { 4587 DeclarationNameInfo NameInfo = SemaRef.GetNameForDeclarator(D); 4588 DeclarationName Name = NameInfo.getName(); 4589 4590 FunctionDecl *NewFD = 0; 4591 bool isInline = D.getDeclSpec().isInlineSpecified(); 4592 DeclSpec::SCS SCSpec = D.getDeclSpec().getStorageClassSpecAsWritten(); 4593 FunctionDecl::StorageClass SCAsWritten 4594 = StorageClassSpecToFunctionDeclStorageClass(SCSpec); 4595 4596 if (!SemaRef.getLangOptions().CPlusPlus) { 4597 // Determine whether the function was written with a 4598 // prototype. This true when: 4599 // - there is a prototype in the declarator, or 4600 // - the type R of the function is some kind of typedef or other reference 4601 // to a type name (which eventually refers to a function type). 4602 bool HasPrototype = 4603 (D.isFunctionDeclarator() && D.getFunctionTypeInfo().hasPrototype) || 4604 (!isa<FunctionType>(R.getTypePtr()) && R->isFunctionProtoType()); 4605 4606 NewFD = FunctionDecl::Create(SemaRef.Context, DC, 4607 D.getSourceRange().getBegin(), NameInfo, R, 4608 TInfo, SC, SCAsWritten, isInline, 4609 HasPrototype); 4610 if (D.isInvalidType()) 4611 NewFD->setInvalidDecl(); 4612 4613 // Set the lexical context. 4614 NewFD->setLexicalDeclContext(SemaRef.CurContext); 4615 4616 return NewFD; 4617 } 4618 4619 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 4620 bool isConstexpr = D.getDeclSpec().isConstexprSpecified(); 4621 4622 // Check that the return type is not an abstract class type. 4623 // For record types, this is done by the AbstractClassUsageDiagnoser once 4624 // the class has been completely parsed. 4625 if (!DC->isRecord() && 4626 SemaRef.RequireNonAbstractType(D.getIdentifierLoc(), 4627 R->getAs<FunctionType>()->getResultType(), 4628 diag::err_abstract_type_in_decl, 4629 SemaRef.AbstractReturnType)) 4630 D.setInvalidType(); 4631 4632 if (Name.getNameKind() == DeclarationName::CXXConstructorName) { 4633 // This is a C++ constructor declaration. 4634 assert(DC->isRecord() && 4635 "Constructors can only be declared in a member context"); 4636 4637 R = SemaRef.CheckConstructorDeclarator(D, R, SC); 4638 return CXXConstructorDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4639 D.getSourceRange().getBegin(), NameInfo, 4640 R, TInfo, isExplicit, isInline, 4641 /*isImplicitlyDeclared=*/false, 4642 isConstexpr); 4643 4644 } else if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4645 // This is a C++ destructor declaration. 4646 if (DC->isRecord()) { 4647 R = SemaRef.CheckDestructorDeclarator(D, R, SC); 4648 CXXRecordDecl *Record = cast<CXXRecordDecl>(DC); 4649 CXXDestructorDecl *NewDD = CXXDestructorDecl::Create( 4650 SemaRef.Context, Record, 4651 D.getSourceRange().getBegin(), 4652 NameInfo, R, TInfo, isInline, 4653 /*isImplicitlyDeclared=*/false); 4654 4655 // If the class is complete, then we now create the implicit exception 4656 // specification. If the class is incomplete or dependent, we can't do 4657 // it yet. 4658 if (SemaRef.getLangOptions().CPlusPlus0x && !Record->isDependentType() && 4659 Record->getDefinition() && !Record->isBeingDefined() && 4660 R->getAs<FunctionProtoType>()->getExceptionSpecType() == EST_None) { 4661 SemaRef.AdjustDestructorExceptionSpec(Record, NewDD); 4662 } 4663 4664 IsVirtualOkay = true; 4665 return NewDD; 4666 4667 } else { 4668 SemaRef.Diag(D.getIdentifierLoc(), diag::err_destructor_not_member); 4669 D.setInvalidType(); 4670 4671 // Create a FunctionDecl to satisfy the function definition parsing 4672 // code path. 4673 return FunctionDecl::Create(SemaRef.Context, DC, 4674 D.getSourceRange().getBegin(), 4675 D.getIdentifierLoc(), Name, R, TInfo, 4676 SC, SCAsWritten, isInline, 4677 /*hasPrototype=*/true, isConstexpr); 4678 } 4679 4680 } else if (Name.getNameKind() == DeclarationName::CXXConversionFunctionName) { 4681 if (!DC->isRecord()) { 4682 SemaRef.Diag(D.getIdentifierLoc(), 4683 diag::err_conv_function_not_member); 4684 return 0; 4685 } 4686 4687 SemaRef.CheckConversionDeclarator(D, R, SC); 4688 IsVirtualOkay = true; 4689 return CXXConversionDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4690 D.getSourceRange().getBegin(), NameInfo, 4691 R, TInfo, isInline, isExplicit, 4692 isConstexpr, SourceLocation()); 4693 4694 } else if (DC->isRecord()) { 4695 // If the name of the function is the same as the name of the record, 4696 // then this must be an invalid constructor that has a return type. 4697 // (The parser checks for a return type and makes the declarator a 4698 // constructor if it has no return type). 4699 if (Name.getAsIdentifierInfo() && 4700 Name.getAsIdentifierInfo() == cast<CXXRecordDecl>(DC)->getIdentifier()){ 4701 SemaRef.Diag(D.getIdentifierLoc(), diag::err_constructor_return_type) 4702 << SourceRange(D.getDeclSpec().getTypeSpecTypeLoc()) 4703 << SourceRange(D.getIdentifierLoc()); 4704 return 0; 4705 } 4706 4707 bool isStatic = SC == SC_Static; 4708 4709 // [class.free]p1: 4710 // Any allocation function for a class T is a static member 4711 // (even if not explicitly declared static). 4712 if (Name.getCXXOverloadedOperator() == OO_New || 4713 Name.getCXXOverloadedOperator() == OO_Array_New) 4714 isStatic = true; 4715 4716 // [class.free]p6 Any deallocation function for a class X is a static member 4717 // (even if not explicitly declared static). 4718 if (Name.getCXXOverloadedOperator() == OO_Delete || 4719 Name.getCXXOverloadedOperator() == OO_Array_Delete) 4720 isStatic = true; 4721 4722 IsVirtualOkay = !isStatic; 4723 4724 // This is a C++ method declaration. 4725 return CXXMethodDecl::Create(SemaRef.Context, cast<CXXRecordDecl>(DC), 4726 D.getSourceRange().getBegin(), NameInfo, R, 4727 TInfo, isStatic, SCAsWritten, isInline, 4728 isConstexpr, SourceLocation()); 4729 4730 } else { 4731 // Determine whether the function was written with a 4732 // prototype. This true when: 4733 // - we're in C++ (where every function has a prototype), 4734 return FunctionDecl::Create(SemaRef.Context, DC, 4735 D.getSourceRange().getBegin(), 4736 NameInfo, R, TInfo, SC, SCAsWritten, isInline, 4737 true/*HasPrototype*/, isConstexpr); 4738 } 4739} 4740 4741NamedDecl* 4742Sema::ActOnFunctionDeclarator(Scope *S, Declarator &D, DeclContext *DC, 4743 TypeSourceInfo *TInfo, LookupResult &Previous, 4744 MultiTemplateParamsArg TemplateParamLists, 4745 bool &AddToScope) { 4746 QualType R = TInfo->getType(); 4747 4748 assert(R.getTypePtr()->isFunctionType()); 4749 4750 // TODO: consider using NameInfo for diagnostic. 4751 DeclarationNameInfo NameInfo = GetNameForDeclarator(D); 4752 DeclarationName Name = NameInfo.getName(); 4753 FunctionDecl::StorageClass SC = getFunctionStorageClass(*this, D); 4754 4755 if (D.getDeclSpec().isThreadSpecified()) 4756 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 4757 4758 // Do not allow returning a objc interface by-value. 4759 if (R->getAs<FunctionType>()->getResultType()->isObjCObjectType()) { 4760 Diag(D.getIdentifierLoc(), 4761 diag::err_object_cannot_be_passed_returned_by_value) << 0 4762 << R->getAs<FunctionType>()->getResultType() 4763 << FixItHint::CreateInsertion(D.getIdentifierLoc(), "*"); 4764 4765 QualType T = R->getAs<FunctionType>()->getResultType(); 4766 T = Context.getObjCObjectPointerType(T); 4767 if (const FunctionProtoType *FPT = dyn_cast<FunctionProtoType>(R)) { 4768 FunctionProtoType::ExtProtoInfo EPI = FPT->getExtProtoInfo(); 4769 R = Context.getFunctionType(T, FPT->arg_type_begin(), 4770 FPT->getNumArgs(), EPI); 4771 } 4772 else if (isa<FunctionNoProtoType>(R)) 4773 R = Context.getFunctionNoProtoType(T); 4774 } 4775 4776 bool isFriend = false; 4777 FunctionTemplateDecl *FunctionTemplate = 0; 4778 bool isExplicitSpecialization = false; 4779 bool isFunctionTemplateSpecialization = false; 4780 bool isDependentClassScopeExplicitSpecialization = false; 4781 bool isVirtualOkay = false; 4782 4783 FunctionDecl *NewFD = CreateNewFunctionDecl(*this, D, DC, R, TInfo, SC, 4784 isVirtualOkay); 4785 if (!NewFD) return 0; 4786 4787 if (OriginalLexicalContext && OriginalLexicalContext->isObjCContainer()) 4788 NewFD->setTopLevelDeclInObjCContainer(); 4789 4790 if (getLangOptions().CPlusPlus) { 4791 bool isInline = D.getDeclSpec().isInlineSpecified(); 4792 bool isVirtual = D.getDeclSpec().isVirtualSpecified(); 4793 bool isExplicit = D.getDeclSpec().isExplicitSpecified(); 4794 bool isConstexpr = D.getDeclSpec().isConstexprSpecified(); 4795 isFriend = D.getDeclSpec().isFriendSpecified(); 4796 if (isFriend && !isInline && D.isFunctionDefinition()) { 4797 // C++ [class.friend]p5 4798 // A function can be defined in a friend declaration of a 4799 // class . . . . Such a function is implicitly inline. 4800 NewFD->setImplicitlyInline(); 4801 } 4802 4803 SetNestedNameSpecifier(NewFD, D); 4804 isExplicitSpecialization = false; 4805 isFunctionTemplateSpecialization = false; 4806 if (D.isInvalidType()) 4807 NewFD->setInvalidDecl(); 4808 4809 // Set the lexical context. If the declarator has a C++ 4810 // scope specifier, or is the object of a friend declaration, the 4811 // lexical context will be different from the semantic context. 4812 NewFD->setLexicalDeclContext(CurContext); 4813 4814 // Match up the template parameter lists with the scope specifier, then 4815 // determine whether we have a template or a template specialization. 4816 bool Invalid = false; 4817 if (TemplateParameterList *TemplateParams 4818 = MatchTemplateParametersToScopeSpecifier( 4819 D.getDeclSpec().getSourceRange().getBegin(), 4820 D.getIdentifierLoc(), 4821 D.getCXXScopeSpec(), 4822 TemplateParamLists.get(), 4823 TemplateParamLists.size(), 4824 isFriend, 4825 isExplicitSpecialization, 4826 Invalid)) { 4827 if (TemplateParams->size() > 0) { 4828 // This is a function template 4829 4830 // Check that we can declare a template here. 4831 if (CheckTemplateDeclScope(S, TemplateParams)) 4832 return 0; 4833 4834 // A destructor cannot be a template. 4835 if (Name.getNameKind() == DeclarationName::CXXDestructorName) { 4836 Diag(NewFD->getLocation(), diag::err_destructor_template); 4837 return 0; 4838 } 4839 4840 // If we're adding a template to a dependent context, we may need to 4841 // rebuilding some of the types used within the template parameter list, 4842 // now that we know what the current instantiation is. 4843 if (DC->isDependentContext()) { 4844 ContextRAII SavedContext(*this, DC); 4845 if (RebuildTemplateParamsInCurrentInstantiation(TemplateParams)) 4846 Invalid = true; 4847 } 4848 4849 4850 FunctionTemplate = FunctionTemplateDecl::Create(Context, DC, 4851 NewFD->getLocation(), 4852 Name, TemplateParams, 4853 NewFD); 4854 FunctionTemplate->setLexicalDeclContext(CurContext); 4855 NewFD->setDescribedFunctionTemplate(FunctionTemplate); 4856 4857 // For source fidelity, store the other template param lists. 4858 if (TemplateParamLists.size() > 1) { 4859 NewFD->setTemplateParameterListsInfo(Context, 4860 TemplateParamLists.size() - 1, 4861 TemplateParamLists.release()); 4862 } 4863 } else { 4864 // This is a function template specialization. 4865 isFunctionTemplateSpecialization = true; 4866 // For source fidelity, store all the template param lists. 4867 NewFD->setTemplateParameterListsInfo(Context, 4868 TemplateParamLists.size(), 4869 TemplateParamLists.release()); 4870 4871 // C++0x [temp.expl.spec]p20 forbids "template<> friend void foo(int);". 4872 if (isFriend) { 4873 // We want to remove the "template<>", found here. 4874 SourceRange RemoveRange = TemplateParams->getSourceRange(); 4875 4876 // If we remove the template<> and the name is not a 4877 // template-id, we're actually silently creating a problem: 4878 // the friend declaration will refer to an untemplated decl, 4879 // and clearly the user wants a template specialization. So 4880 // we need to insert '<>' after the name. 4881 SourceLocation InsertLoc; 4882 if (D.getName().getKind() != UnqualifiedId::IK_TemplateId) { 4883 InsertLoc = D.getName().getSourceRange().getEnd(); 4884 InsertLoc = PP.getLocForEndOfToken(InsertLoc); 4885 } 4886 4887 Diag(D.getIdentifierLoc(), diag::err_template_spec_decl_friend) 4888 << Name << RemoveRange 4889 << FixItHint::CreateRemoval(RemoveRange) 4890 << FixItHint::CreateInsertion(InsertLoc, "<>"); 4891 } 4892 } 4893 } 4894 else { 4895 // All template param lists were matched against the scope specifier: 4896 // this is NOT (an explicit specialization of) a template. 4897 if (TemplateParamLists.size() > 0) 4898 // For source fidelity, store all the template param lists. 4899 NewFD->setTemplateParameterListsInfo(Context, 4900 TemplateParamLists.size(), 4901 TemplateParamLists.release()); 4902 } 4903 4904 if (Invalid) { 4905 NewFD->setInvalidDecl(); 4906 if (FunctionTemplate) 4907 FunctionTemplate->setInvalidDecl(); 4908 } 4909 4910 // If we see "T var();" at block scope, where T is a class type, it is 4911 // probably an attempt to initialize a variable, not a function declaration. 4912 // We don't catch this case earlier, since there is no ambiguity here. 4913 if (!FunctionTemplate && D.getFunctionDefinitionKind() == FDK_Declaration && 4914 CurContext->isFunctionOrMethod() && 4915 D.getNumTypeObjects() == 1 && D.isFunctionDeclarator() && 4916 D.getDeclSpec().getStorageClassSpecAsWritten() 4917 == DeclSpec::SCS_unspecified) { 4918 QualType T = R->getAs<FunctionType>()->getResultType(); 4919 DeclaratorChunk &C = D.getTypeObject(0); 4920 if (!T->isVoidType() && C.Fun.NumArgs == 0 && !C.Fun.isVariadic && 4921 !C.Fun.TrailingReturnType && 4922 C.Fun.getExceptionSpecType() == EST_None) { 4923 SourceRange ParenRange(C.Loc, C.EndLoc); 4924 Diag(C.Loc, diag::warn_empty_parens_are_function_decl) << ParenRange; 4925 4926 // If the declaration looks like: 4927 // T var1, 4928 // f(); 4929 // and name lookup finds a function named 'f', then the ',' was 4930 // probably intended to be a ';'. 4931 if (!D.isFirstDeclarator() && D.getIdentifier()) { 4932 FullSourceLoc Comma(D.getCommaLoc(), SourceMgr); 4933 FullSourceLoc Name(D.getIdentifierLoc(), SourceMgr); 4934 if (Comma.getFileID() != Name.getFileID() || 4935 Comma.getSpellingLineNumber() != Name.getSpellingLineNumber()) { 4936 LookupResult Result(*this, D.getIdentifier(), SourceLocation(), 4937 LookupOrdinaryName); 4938 if (LookupName(Result, S)) 4939 Diag(D.getCommaLoc(), diag::note_empty_parens_function_call) 4940 << FixItHint::CreateReplacement(D.getCommaLoc(), ";") << NewFD; 4941 } 4942 } 4943 const CXXRecordDecl *RD = T->getAsCXXRecordDecl(); 4944 // Empty parens mean value-initialization, and no parens mean default 4945 // initialization. These are equivalent if the default constructor is 4946 // user-provided, or if zero-initialization is a no-op. 4947 if (RD && RD->hasDefinition() && 4948 (RD->isEmpty() || RD->hasUserProvidedDefaultConstructor())) 4949 Diag(C.Loc, diag::note_empty_parens_default_ctor) 4950 << FixItHint::CreateRemoval(ParenRange); 4951 else if (const char *Init = getFixItZeroInitializerForType(T)) 4952 Diag(C.Loc, diag::note_empty_parens_zero_initialize) 4953 << FixItHint::CreateReplacement(ParenRange, Init); 4954 else if (LangOpts.CPlusPlus0x) 4955 Diag(C.Loc, diag::note_empty_parens_zero_initialize) 4956 << FixItHint::CreateReplacement(ParenRange, "{}"); 4957 } 4958 } 4959 4960 // C++ [dcl.fct.spec]p5: 4961 // The virtual specifier shall only be used in declarations of 4962 // nonstatic class member functions that appear within a 4963 // member-specification of a class declaration; see 10.3. 4964 // 4965 if (isVirtual && !NewFD->isInvalidDecl()) { 4966 if (!isVirtualOkay) { 4967 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4968 diag::err_virtual_non_function); 4969 } else if (!CurContext->isRecord()) { 4970 // 'virtual' was specified outside of the class. 4971 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4972 diag::err_virtual_out_of_class) 4973 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 4974 } else if (NewFD->getDescribedFunctionTemplate()) { 4975 // C++ [temp.mem]p3: 4976 // A member function template shall not be virtual. 4977 Diag(D.getDeclSpec().getVirtualSpecLoc(), 4978 diag::err_virtual_member_function_template) 4979 << FixItHint::CreateRemoval(D.getDeclSpec().getVirtualSpecLoc()); 4980 } else { 4981 // Okay: Add virtual to the method. 4982 NewFD->setVirtualAsWritten(true); 4983 } 4984 } 4985 4986 // C++ [dcl.fct.spec]p3: 4987 // The inline specifier shall not appear on a block scope function 4988 // declaration. 4989 if (isInline && !NewFD->isInvalidDecl()) { 4990 if (CurContext->isFunctionOrMethod()) { 4991 // 'inline' is not allowed on block scope function declaration. 4992 Diag(D.getDeclSpec().getInlineSpecLoc(), 4993 diag::err_inline_declaration_block_scope) << Name 4994 << FixItHint::CreateRemoval(D.getDeclSpec().getInlineSpecLoc()); 4995 } 4996 } 4997 4998 // C++ [dcl.fct.spec]p6: 4999 // The explicit specifier shall be used only in the declaration of a 5000 // constructor or conversion function within its class definition; 5001 // see 12.3.1 and 12.3.2. 5002 if (isExplicit && !NewFD->isInvalidDecl()) { 5003 if (!CurContext->isRecord()) { 5004 // 'explicit' was specified outside of the class. 5005 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5006 diag::err_explicit_out_of_class) 5007 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 5008 } else if (!isa<CXXConstructorDecl>(NewFD) && 5009 !isa<CXXConversionDecl>(NewFD)) { 5010 // 'explicit' was specified on a function that wasn't a constructor 5011 // or conversion function. 5012 Diag(D.getDeclSpec().getExplicitSpecLoc(), 5013 diag::err_explicit_non_ctor_or_conv_function) 5014 << FixItHint::CreateRemoval(D.getDeclSpec().getExplicitSpecLoc()); 5015 } 5016 } 5017 5018 if (isConstexpr) { 5019 // C++0x [dcl.constexpr]p2: constexpr functions and constexpr constructors 5020 // are implicitly inline. 5021 NewFD->setImplicitlyInline(); 5022 5023 // C++0x [dcl.constexpr]p3: functions declared constexpr are required to 5024 // be either constructors or to return a literal type. Therefore, 5025 // destructors cannot be declared constexpr. 5026 if (isa<CXXDestructorDecl>(NewFD)) 5027 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_constexpr_dtor); 5028 } 5029 5030 // If __module_private__ was specified, mark the function accordingly. 5031 if (D.getDeclSpec().isModulePrivateSpecified()) { 5032 if (isFunctionTemplateSpecialization) { 5033 SourceLocation ModulePrivateLoc 5034 = D.getDeclSpec().getModulePrivateSpecLoc(); 5035 Diag(ModulePrivateLoc, diag::err_module_private_specialization) 5036 << 0 5037 << FixItHint::CreateRemoval(ModulePrivateLoc); 5038 } else { 5039 NewFD->setModulePrivate(); 5040 if (FunctionTemplate) 5041 FunctionTemplate->setModulePrivate(); 5042 } 5043 } 5044 5045 if (isFriend) { 5046 // For now, claim that the objects have no previous declaration. 5047 if (FunctionTemplate) { 5048 FunctionTemplate->setObjectOfFriendDecl(false); 5049 FunctionTemplate->setAccess(AS_public); 5050 } 5051 NewFD->setObjectOfFriendDecl(false); 5052 NewFD->setAccess(AS_public); 5053 } 5054 5055 // If a function is defined as defaulted or deleted, mark it as such now. 5056 switch (D.getFunctionDefinitionKind()) { 5057 case FDK_Declaration: 5058 case FDK_Definition: 5059 break; 5060 5061 case FDK_Defaulted: 5062 NewFD->setDefaulted(); 5063 break; 5064 5065 case FDK_Deleted: 5066 NewFD->setDeletedAsWritten(); 5067 break; 5068 } 5069 5070 if (isa<CXXMethodDecl>(NewFD) && DC == CurContext && 5071 D.isFunctionDefinition()) { 5072 // C++ [class.mfct]p2: 5073 // A member function may be defined (8.4) in its class definition, in 5074 // which case it is an inline member function (7.1.2) 5075 NewFD->setImplicitlyInline(); 5076 } 5077 5078 if (SC == SC_Static && isa<CXXMethodDecl>(NewFD) && 5079 !CurContext->isRecord()) { 5080 // C++ [class.static]p1: 5081 // A data or function member of a class may be declared static 5082 // in a class definition, in which case it is a static member of 5083 // the class. 5084 5085 // Complain about the 'static' specifier if it's on an out-of-line 5086 // member function definition. 5087 Diag(D.getDeclSpec().getStorageClassSpecLoc(), 5088 diag::err_static_out_of_line) 5089 << FixItHint::CreateRemoval(D.getDeclSpec().getStorageClassSpecLoc()); 5090 } 5091 } 5092 5093 // Filter out previous declarations that don't match the scope. 5094 FilterLookupForScope(Previous, DC, S, NewFD->hasLinkage(), 5095 isExplicitSpecialization || 5096 isFunctionTemplateSpecialization); 5097 5098 // Handle GNU asm-label extension (encoded as an attribute). 5099 if (Expr *E = (Expr*) D.getAsmLabel()) { 5100 // The parser guarantees this is a string. 5101 StringLiteral *SE = cast<StringLiteral>(E); 5102 NewFD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), Context, 5103 SE->getString())); 5104 } 5105 5106 // Copy the parameter declarations from the declarator D to the function 5107 // declaration NewFD, if they are available. First scavenge them into Params. 5108 SmallVector<ParmVarDecl*, 16> Params; 5109 if (D.isFunctionDeclarator()) { 5110 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 5111 5112 // Check for C99 6.7.5.3p10 - foo(void) is a non-varargs 5113 // function that takes no arguments, not a function that takes a 5114 // single void argument. 5115 // We let through "const void" here because Sema::GetTypeForDeclarator 5116 // already checks for that case. 5117 if (FTI.NumArgs == 1 && !FTI.isVariadic && FTI.ArgInfo[0].Ident == 0 && 5118 FTI.ArgInfo[0].Param && 5119 cast<ParmVarDecl>(FTI.ArgInfo[0].Param)->getType()->isVoidType()) { 5120 // Empty arg list, don't push any params. 5121 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[0].Param); 5122 5123 // In C++, the empty parameter-type-list must be spelled "void"; a 5124 // typedef of void is not permitted. 5125 if (getLangOptions().CPlusPlus && 5126 Param->getType().getUnqualifiedType() != Context.VoidTy) { 5127 bool IsTypeAlias = false; 5128 if (const TypedefType *TT = Param->getType()->getAs<TypedefType>()) 5129 IsTypeAlias = isa<TypeAliasDecl>(TT->getDecl()); 5130 else if (const TemplateSpecializationType *TST = 5131 Param->getType()->getAs<TemplateSpecializationType>()) 5132 IsTypeAlias = TST->isTypeAlias(); 5133 Diag(Param->getLocation(), diag::err_param_typedef_of_void) 5134 << IsTypeAlias; 5135 } 5136 } else if (FTI.NumArgs > 0 && FTI.ArgInfo[0].Param != 0) { 5137 for (unsigned i = 0, e = FTI.NumArgs; i != e; ++i) { 5138 ParmVarDecl *Param = cast<ParmVarDecl>(FTI.ArgInfo[i].Param); 5139 assert(Param->getDeclContext() != NewFD && "Was set before ?"); 5140 Param->setDeclContext(NewFD); 5141 Params.push_back(Param); 5142 5143 if (Param->isInvalidDecl()) 5144 NewFD->setInvalidDecl(); 5145 } 5146 } 5147 5148 } else if (const FunctionProtoType *FT = R->getAs<FunctionProtoType>()) { 5149 // When we're declaring a function with a typedef, typeof, etc as in the 5150 // following example, we'll need to synthesize (unnamed) 5151 // parameters for use in the declaration. 5152 // 5153 // @code 5154 // typedef void fn(int); 5155 // fn f; 5156 // @endcode 5157 5158 // Synthesize a parameter for each argument type. 5159 for (FunctionProtoType::arg_type_iterator AI = FT->arg_type_begin(), 5160 AE = FT->arg_type_end(); AI != AE; ++AI) { 5161 ParmVarDecl *Param = 5162 BuildParmVarDeclForTypedef(NewFD, D.getIdentifierLoc(), *AI); 5163 Param->setScopeInfo(0, Params.size()); 5164 Params.push_back(Param); 5165 } 5166 } else { 5167 assert(R->isFunctionNoProtoType() && NewFD->getNumParams() == 0 && 5168 "Should not need args for typedef of non-prototype fn"); 5169 } 5170 5171 // Finally, we know we have the right number of parameters, install them. 5172 NewFD->setParams(Params); 5173 5174 // Process the non-inheritable attributes on this declaration. 5175 ProcessDeclAttributes(S, NewFD, D, 5176 /*NonInheritable=*/true, /*Inheritable=*/false); 5177 5178 if (!getLangOptions().CPlusPlus) { 5179 // Perform semantic checking on the function declaration. 5180 bool isExplicitSpecialization=false; 5181 if (!NewFD->isInvalidDecl()) { 5182 if (NewFD->getResultType()->isVariablyModifiedType()) { 5183 // Functions returning a variably modified type violate C99 6.7.5.2p2 5184 // because all functions have linkage. 5185 Diag(NewFD->getLocation(), diag::err_vm_func_decl); 5186 NewFD->setInvalidDecl(); 5187 } else { 5188 if (NewFD->isMain()) 5189 CheckMain(NewFD, D.getDeclSpec()); 5190 D.setRedeclaration(CheckFunctionDeclaration(S, NewFD, Previous, 5191 isExplicitSpecialization)); 5192 } 5193 } 5194 assert((NewFD->isInvalidDecl() || !D.isRedeclaration() || 5195 Previous.getResultKind() != LookupResult::FoundOverloaded) && 5196 "previous declaration set still overloaded"); 5197 } else { 5198 // If the declarator is a template-id, translate the parser's template 5199 // argument list into our AST format. 5200 bool HasExplicitTemplateArgs = false; 5201 TemplateArgumentListInfo TemplateArgs; 5202 if (D.getName().getKind() == UnqualifiedId::IK_TemplateId) { 5203 TemplateIdAnnotation *TemplateId = D.getName().TemplateId; 5204 TemplateArgs.setLAngleLoc(TemplateId->LAngleLoc); 5205 TemplateArgs.setRAngleLoc(TemplateId->RAngleLoc); 5206 ASTTemplateArgsPtr TemplateArgsPtr(*this, 5207 TemplateId->getTemplateArgs(), 5208 TemplateId->NumArgs); 5209 translateTemplateArguments(TemplateArgsPtr, 5210 TemplateArgs); 5211 TemplateArgsPtr.release(); 5212 5213 HasExplicitTemplateArgs = true; 5214 5215 if (NewFD->isInvalidDecl()) { 5216 HasExplicitTemplateArgs = false; 5217 } else if (FunctionTemplate) { 5218 // Function template with explicit template arguments. 5219 Diag(D.getIdentifierLoc(), diag::err_function_template_partial_spec) 5220 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc); 5221 5222 HasExplicitTemplateArgs = false; 5223 } else if (!isFunctionTemplateSpecialization && 5224 !D.getDeclSpec().isFriendSpecified()) { 5225 // We have encountered something that the user meant to be a 5226 // specialization (because it has explicitly-specified template 5227 // arguments) but that was not introduced with a "template<>" (or had 5228 // too few of them). 5229 Diag(D.getIdentifierLoc(), diag::err_template_spec_needs_header) 5230 << SourceRange(TemplateId->LAngleLoc, TemplateId->RAngleLoc) 5231 << FixItHint::CreateInsertion( 5232 D.getDeclSpec().getSourceRange().getBegin(), 5233 "template<> "); 5234 isFunctionTemplateSpecialization = true; 5235 } else { 5236 // "friend void foo<>(int);" is an implicit specialization decl. 5237 isFunctionTemplateSpecialization = true; 5238 } 5239 } else if (isFriend && isFunctionTemplateSpecialization) { 5240 // This combination is only possible in a recovery case; the user 5241 // wrote something like: 5242 // template <> friend void foo(int); 5243 // which we're recovering from as if the user had written: 5244 // friend void foo<>(int); 5245 // Go ahead and fake up a template id. 5246 HasExplicitTemplateArgs = true; 5247 TemplateArgs.setLAngleLoc(D.getIdentifierLoc()); 5248 TemplateArgs.setRAngleLoc(D.getIdentifierLoc()); 5249 } 5250 5251 // If it's a friend (and only if it's a friend), it's possible 5252 // that either the specialized function type or the specialized 5253 // template is dependent, and therefore matching will fail. In 5254 // this case, don't check the specialization yet. 5255 bool InstantiationDependent = false; 5256 if (isFunctionTemplateSpecialization && isFriend && 5257 (NewFD->getType()->isDependentType() || DC->isDependentContext() || 5258 TemplateSpecializationType::anyDependentTemplateArguments( 5259 TemplateArgs.getArgumentArray(), TemplateArgs.size(), 5260 InstantiationDependent))) { 5261 assert(HasExplicitTemplateArgs && 5262 "friend function specialization without template args"); 5263 if (CheckDependentFunctionTemplateSpecialization(NewFD, TemplateArgs, 5264 Previous)) 5265 NewFD->setInvalidDecl(); 5266 } else if (isFunctionTemplateSpecialization) { 5267 if (CurContext->isDependentContext() && CurContext->isRecord() 5268 && !isFriend) { 5269 isDependentClassScopeExplicitSpecialization = true; 5270 Diag(NewFD->getLocation(), getLangOptions().MicrosoftExt ? 5271 diag::ext_function_specialization_in_class : 5272 diag::err_function_specialization_in_class) 5273 << NewFD->getDeclName(); 5274 } else if (CheckFunctionTemplateSpecialization(NewFD, 5275 (HasExplicitTemplateArgs ? &TemplateArgs : 0), 5276 Previous)) 5277 NewFD->setInvalidDecl(); 5278 5279 // C++ [dcl.stc]p1: 5280 // A storage-class-specifier shall not be specified in an explicit 5281 // specialization (14.7.3) 5282 if (SC != SC_None) { 5283 if (SC != NewFD->getStorageClass()) 5284 Diag(NewFD->getLocation(), 5285 diag::err_explicit_specialization_inconsistent_storage_class) 5286 << SC 5287 << FixItHint::CreateRemoval( 5288 D.getDeclSpec().getStorageClassSpecLoc()); 5289 5290 else 5291 Diag(NewFD->getLocation(), 5292 diag::ext_explicit_specialization_storage_class) 5293 << FixItHint::CreateRemoval( 5294 D.getDeclSpec().getStorageClassSpecLoc()); 5295 } 5296 5297 } else if (isExplicitSpecialization && isa<CXXMethodDecl>(NewFD)) { 5298 if (CheckMemberSpecialization(NewFD, Previous)) 5299 NewFD->setInvalidDecl(); 5300 } 5301 5302 // Perform semantic checking on the function declaration. 5303 if (!isDependentClassScopeExplicitSpecialization) { 5304 if (NewFD->isInvalidDecl()) { 5305 // If this is a class member, mark the class invalid immediately. 5306 // This avoids some consistency errors later. 5307 if (CXXMethodDecl* methodDecl = dyn_cast<CXXMethodDecl>(NewFD)) 5308 methodDecl->getParent()->setInvalidDecl(); 5309 } else { 5310 if (NewFD->isMain()) 5311 CheckMain(NewFD, D.getDeclSpec()); 5312 D.setRedeclaration(CheckFunctionDeclaration(S, NewFD, Previous, 5313 isExplicitSpecialization)); 5314 } 5315 } 5316 5317 assert((NewFD->isInvalidDecl() || !D.isRedeclaration() || 5318 Previous.getResultKind() != LookupResult::FoundOverloaded) && 5319 "previous declaration set still overloaded"); 5320 5321 if (NewFD->isConstexpr() && !NewFD->isInvalidDecl() && 5322 !CheckConstexprFunctionDecl(NewFD, CCK_Declaration)) 5323 NewFD->setInvalidDecl(); 5324 5325 NamedDecl *PrincipalDecl = (FunctionTemplate 5326 ? cast<NamedDecl>(FunctionTemplate) 5327 : NewFD); 5328 5329 if (isFriend && D.isRedeclaration()) { 5330 AccessSpecifier Access = AS_public; 5331 if (!NewFD->isInvalidDecl()) 5332 Access = NewFD->getPreviousDecl()->getAccess(); 5333 5334 NewFD->setAccess(Access); 5335 if (FunctionTemplate) FunctionTemplate->setAccess(Access); 5336 5337 PrincipalDecl->setObjectOfFriendDecl(true); 5338 } 5339 5340 if (NewFD->isOverloadedOperator() && !DC->isRecord() && 5341 PrincipalDecl->isInIdentifierNamespace(Decl::IDNS_Ordinary)) 5342 PrincipalDecl->setNonMemberOperator(); 5343 5344 // If we have a function template, check the template parameter 5345 // list. This will check and merge default template arguments. 5346 if (FunctionTemplate) { 5347 FunctionTemplateDecl *PrevTemplate = 5348 FunctionTemplate->getPreviousDecl(); 5349 CheckTemplateParameterList(FunctionTemplate->getTemplateParameters(), 5350 PrevTemplate ? PrevTemplate->getTemplateParameters() : 0, 5351 D.getDeclSpec().isFriendSpecified() 5352 ? (D.isFunctionDefinition() 5353 ? TPC_FriendFunctionTemplateDefinition 5354 : TPC_FriendFunctionTemplate) 5355 : (D.getCXXScopeSpec().isSet() && 5356 DC && DC->isRecord() && 5357 DC->isDependentContext()) 5358 ? TPC_ClassTemplateMember 5359 : TPC_FunctionTemplate); 5360 } 5361 5362 if (NewFD->isInvalidDecl()) { 5363 // Ignore all the rest of this. 5364 } else if (!D.isRedeclaration()) { 5365 struct ActOnFDArgs ExtraArgs = { S, D, TemplateParamLists, 5366 AddToScope }; 5367 // Fake up an access specifier if it's supposed to be a class member. 5368 if (isa<CXXRecordDecl>(NewFD->getDeclContext())) 5369 NewFD->setAccess(AS_public); 5370 5371 // Qualified decls generally require a previous declaration. 5372 if (D.getCXXScopeSpec().isSet()) { 5373 // ...with the major exception of templated-scope or 5374 // dependent-scope friend declarations. 5375 5376 // TODO: we currently also suppress this check in dependent 5377 // contexts because (1) the parameter depth will be off when 5378 // matching friend templates and (2) we might actually be 5379 // selecting a friend based on a dependent factor. But there 5380 // are situations where these conditions don't apply and we 5381 // can actually do this check immediately. 5382 if (isFriend && 5383 (TemplateParamLists.size() || 5384 D.getCXXScopeSpec().getScopeRep()->isDependent() || 5385 CurContext->isDependentContext())) { 5386 // ignore these 5387 } else { 5388 // The user tried to provide an out-of-line definition for a 5389 // function that is a member of a class or namespace, but there 5390 // was no such member function declared (C++ [class.mfct]p2, 5391 // C++ [namespace.memdef]p2). For example: 5392 // 5393 // class X { 5394 // void f() const; 5395 // }; 5396 // 5397 // void X::f() { } // ill-formed 5398 // 5399 // Complain about this problem, and attempt to suggest close 5400 // matches (e.g., those that differ only in cv-qualifiers and 5401 // whether the parameter types are references). 5402 5403 if (NamedDecl *Result = DiagnoseInvalidRedeclaration(*this, Previous, 5404 NewFD, 5405 ExtraArgs)) { 5406 AddToScope = ExtraArgs.AddToScope; 5407 return Result; 5408 } 5409 } 5410 5411 // Unqualified local friend declarations are required to resolve 5412 // to something. 5413 } else if (isFriend && cast<CXXRecordDecl>(CurContext)->isLocalClass()) { 5414 if (NamedDecl *Result = DiagnoseInvalidRedeclaration(*this, Previous, 5415 NewFD, 5416 ExtraArgs)) { 5417 AddToScope = ExtraArgs.AddToScope; 5418 return Result; 5419 } 5420 } 5421 5422 } else if (!D.isFunctionDefinition() && D.getCXXScopeSpec().isSet() && 5423 !isFriend && !isFunctionTemplateSpecialization && 5424 !isExplicitSpecialization) { 5425 // An out-of-line member function declaration must also be a 5426 // definition (C++ [dcl.meaning]p1). 5427 // Note that this is not the case for explicit specializations of 5428 // function templates or member functions of class templates, per 5429 // C++ [temp.expl.spec]p2. We also allow these declarations as an 5430 // extension for compatibility with old SWIG code which likes to 5431 // generate them. 5432 Diag(NewFD->getLocation(), diag::ext_out_of_line_declaration) 5433 << D.getCXXScopeSpec().getRange(); 5434 } 5435 } 5436 5437 5438 // Handle attributes. We need to have merged decls when handling attributes 5439 // (for example to check for conflicts, etc). 5440 // FIXME: This needs to happen before we merge declarations. Then, 5441 // let attribute merging cope with attribute conflicts. 5442 ProcessDeclAttributes(S, NewFD, D, 5443 /*NonInheritable=*/false, /*Inheritable=*/true); 5444 5445 // attributes declared post-definition are currently ignored 5446 // FIXME: This should happen during attribute merging 5447 if (D.isRedeclaration() && Previous.isSingleResult()) { 5448 const FunctionDecl *Def; 5449 FunctionDecl *PrevFD = dyn_cast<FunctionDecl>(Previous.getFoundDecl()); 5450 if (PrevFD && PrevFD->isDefined(Def) && D.hasAttributes()) { 5451 Diag(NewFD->getLocation(), diag::warn_attribute_precede_definition); 5452 Diag(Def->getLocation(), diag::note_previous_definition); 5453 } 5454 } 5455 5456 AddKnownFunctionAttributes(NewFD); 5457 5458 if (NewFD->hasAttr<OverloadableAttr>() && 5459 !NewFD->getType()->getAs<FunctionProtoType>()) { 5460 Diag(NewFD->getLocation(), 5461 diag::err_attribute_overloadable_no_prototype) 5462 << NewFD; 5463 5464 // Turn this into a variadic function with no parameters. 5465 const FunctionType *FT = NewFD->getType()->getAs<FunctionType>(); 5466 FunctionProtoType::ExtProtoInfo EPI; 5467 EPI.Variadic = true; 5468 EPI.ExtInfo = FT->getExtInfo(); 5469 5470 QualType R = Context.getFunctionType(FT->getResultType(), 0, 0, EPI); 5471 NewFD->setType(R); 5472 } 5473 5474 // If there's a #pragma GCC visibility in scope, and this isn't a class 5475 // member, set the visibility of this function. 5476 if (NewFD->getLinkage() == ExternalLinkage && !DC->isRecord()) 5477 AddPushedVisibilityAttribute(NewFD); 5478 5479 // If there's a #pragma clang arc_cf_code_audited in scope, consider 5480 // marking the function. 5481 AddCFAuditedAttribute(NewFD); 5482 5483 // If this is a locally-scoped extern C function, update the 5484 // map of such names. 5485 if (CurContext->isFunctionOrMethod() && NewFD->isExternC() 5486 && !NewFD->isInvalidDecl()) 5487 RegisterLocallyScopedExternCDecl(NewFD, Previous, S); 5488 5489 // Set this FunctionDecl's range up to the right paren. 5490 NewFD->setRangeEnd(D.getSourceRange().getEnd()); 5491 5492 if (getLangOptions().CPlusPlus) { 5493 if (FunctionTemplate) { 5494 if (NewFD->isInvalidDecl()) 5495 FunctionTemplate->setInvalidDecl(); 5496 return FunctionTemplate; 5497 } 5498 } 5499 5500 MarkUnusedFileScopedDecl(NewFD); 5501 5502 if (getLangOptions().CUDA) 5503 if (IdentifierInfo *II = NewFD->getIdentifier()) 5504 if (!NewFD->isInvalidDecl() && 5505 NewFD->getDeclContext()->getRedeclContext()->isTranslationUnit()) { 5506 if (II->isStr("cudaConfigureCall")) { 5507 if (!R->getAs<FunctionType>()->getResultType()->isScalarType()) 5508 Diag(NewFD->getLocation(), diag::err_config_scalar_return); 5509 5510 Context.setcudaConfigureCallDecl(NewFD); 5511 } 5512 } 5513 5514 // Here we have an function template explicit specialization at class scope. 5515 // The actually specialization will be postponed to template instatiation 5516 // time via the ClassScopeFunctionSpecializationDecl node. 5517 if (isDependentClassScopeExplicitSpecialization) { 5518 ClassScopeFunctionSpecializationDecl *NewSpec = 5519 ClassScopeFunctionSpecializationDecl::Create( 5520 Context, CurContext, SourceLocation(), 5521 cast<CXXMethodDecl>(NewFD)); 5522 CurContext->addDecl(NewSpec); 5523 AddToScope = false; 5524 } 5525 5526 return NewFD; 5527} 5528 5529/// \brief Perform semantic checking of a new function declaration. 5530/// 5531/// Performs semantic analysis of the new function declaration 5532/// NewFD. This routine performs all semantic checking that does not 5533/// require the actual declarator involved in the declaration, and is 5534/// used both for the declaration of functions as they are parsed 5535/// (called via ActOnDeclarator) and for the declaration of functions 5536/// that have been instantiated via C++ template instantiation (called 5537/// via InstantiateDecl). 5538/// 5539/// \param IsExplicitSpecialiation whether this new function declaration is 5540/// an explicit specialization of the previous declaration. 5541/// 5542/// This sets NewFD->isInvalidDecl() to true if there was an error. 5543/// 5544/// Returns true if the function declaration is a redeclaration. 5545bool Sema::CheckFunctionDeclaration(Scope *S, FunctionDecl *NewFD, 5546 LookupResult &Previous, 5547 bool IsExplicitSpecialization) { 5548 assert(!NewFD->getResultType()->isVariablyModifiedType() 5549 && "Variably modified return types are not handled here"); 5550 5551 // Check for a previous declaration of this name. 5552 if (Previous.empty() && NewFD->isExternC()) { 5553 // Since we did not find anything by this name and we're declaring 5554 // an extern "C" function, look for a non-visible extern "C" 5555 // declaration with the same name. 5556 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 5557 = findLocallyScopedExternalDecl(NewFD->getDeclName()); 5558 if (Pos != LocallyScopedExternalDecls.end()) 5559 Previous.addDecl(Pos->second); 5560 } 5561 5562 bool Redeclaration = false; 5563 5564 // Merge or overload the declaration with an existing declaration of 5565 // the same name, if appropriate. 5566 if (!Previous.empty()) { 5567 // Determine whether NewFD is an overload of PrevDecl or 5568 // a declaration that requires merging. If it's an overload, 5569 // there's no more work to do here; we'll just add the new 5570 // function to the scope. 5571 5572 NamedDecl *OldDecl = 0; 5573 if (!AllowOverloadingOfFunction(Previous, Context)) { 5574 Redeclaration = true; 5575 OldDecl = Previous.getFoundDecl(); 5576 } else { 5577 switch (CheckOverload(S, NewFD, Previous, OldDecl, 5578 /*NewIsUsingDecl*/ false)) { 5579 case Ovl_Match: 5580 Redeclaration = true; 5581 break; 5582 5583 case Ovl_NonFunction: 5584 Redeclaration = true; 5585 break; 5586 5587 case Ovl_Overload: 5588 Redeclaration = false; 5589 break; 5590 } 5591 5592 if (!getLangOptions().CPlusPlus && !NewFD->hasAttr<OverloadableAttr>()) { 5593 // If a function name is overloadable in C, then every function 5594 // with that name must be marked "overloadable". 5595 Diag(NewFD->getLocation(), diag::err_attribute_overloadable_missing) 5596 << Redeclaration << NewFD; 5597 NamedDecl *OverloadedDecl = 0; 5598 if (Redeclaration) 5599 OverloadedDecl = OldDecl; 5600 else if (!Previous.empty()) 5601 OverloadedDecl = Previous.getRepresentativeDecl(); 5602 if (OverloadedDecl) 5603 Diag(OverloadedDecl->getLocation(), 5604 diag::note_attribute_overloadable_prev_overload); 5605 NewFD->addAttr(::new (Context) OverloadableAttr(SourceLocation(), 5606 Context)); 5607 } 5608 } 5609 5610 if (Redeclaration) { 5611 // NewFD and OldDecl represent declarations that need to be 5612 // merged. 5613 if (MergeFunctionDecl(NewFD, OldDecl)) { 5614 NewFD->setInvalidDecl(); 5615 return Redeclaration; 5616 } 5617 5618 Previous.clear(); 5619 Previous.addDecl(OldDecl); 5620 5621 if (FunctionTemplateDecl *OldTemplateDecl 5622 = dyn_cast<FunctionTemplateDecl>(OldDecl)) { 5623 NewFD->setPreviousDeclaration(OldTemplateDecl->getTemplatedDecl()); 5624 FunctionTemplateDecl *NewTemplateDecl 5625 = NewFD->getDescribedFunctionTemplate(); 5626 assert(NewTemplateDecl && "Template/non-template mismatch"); 5627 if (CXXMethodDecl *Method 5628 = dyn_cast<CXXMethodDecl>(NewTemplateDecl->getTemplatedDecl())) { 5629 Method->setAccess(OldTemplateDecl->getAccess()); 5630 NewTemplateDecl->setAccess(OldTemplateDecl->getAccess()); 5631 } 5632 5633 // If this is an explicit specialization of a member that is a function 5634 // template, mark it as a member specialization. 5635 if (IsExplicitSpecialization && 5636 NewTemplateDecl->getInstantiatedFromMemberTemplate()) { 5637 NewTemplateDecl->setMemberSpecialization(); 5638 assert(OldTemplateDecl->isMemberSpecialization()); 5639 } 5640 5641 } else { 5642 if (isa<CXXMethodDecl>(NewFD)) // Set access for out-of-line definitions 5643 NewFD->setAccess(OldDecl->getAccess()); 5644 NewFD->setPreviousDeclaration(cast<FunctionDecl>(OldDecl)); 5645 } 5646 } 5647 } 5648 5649 // Semantic checking for this function declaration (in isolation). 5650 if (getLangOptions().CPlusPlus) { 5651 // C++-specific checks. 5652 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(NewFD)) { 5653 CheckConstructor(Constructor); 5654 } else if (CXXDestructorDecl *Destructor = 5655 dyn_cast<CXXDestructorDecl>(NewFD)) { 5656 CXXRecordDecl *Record = Destructor->getParent(); 5657 QualType ClassType = Context.getTypeDeclType(Record); 5658 5659 // FIXME: Shouldn't we be able to perform this check even when the class 5660 // type is dependent? Both gcc and edg can handle that. 5661 if (!ClassType->isDependentType()) { 5662 DeclarationName Name 5663 = Context.DeclarationNames.getCXXDestructorName( 5664 Context.getCanonicalType(ClassType)); 5665 if (NewFD->getDeclName() != Name) { 5666 Diag(NewFD->getLocation(), diag::err_destructor_name); 5667 NewFD->setInvalidDecl(); 5668 return Redeclaration; 5669 } 5670 } 5671 } else if (CXXConversionDecl *Conversion 5672 = dyn_cast<CXXConversionDecl>(NewFD)) { 5673 ActOnConversionDeclarator(Conversion); 5674 } 5675 5676 // Find any virtual functions that this function overrides. 5677 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(NewFD)) { 5678 if (!Method->isFunctionTemplateSpecialization() && 5679 !Method->getDescribedFunctionTemplate()) { 5680 if (AddOverriddenMethods(Method->getParent(), Method)) { 5681 // If the function was marked as "static", we have a problem. 5682 if (NewFD->getStorageClass() == SC_Static) { 5683 Diag(NewFD->getLocation(), diag::err_static_overrides_virtual) 5684 << NewFD->getDeclName(); 5685 for (CXXMethodDecl::method_iterator 5686 Overridden = Method->begin_overridden_methods(), 5687 OverriddenEnd = Method->end_overridden_methods(); 5688 Overridden != OverriddenEnd; 5689 ++Overridden) { 5690 Diag((*Overridden)->getLocation(), 5691 diag::note_overridden_virtual_function); 5692 } 5693 } 5694 } 5695 } 5696 } 5697 5698 // Extra checking for C++ overloaded operators (C++ [over.oper]). 5699 if (NewFD->isOverloadedOperator() && 5700 CheckOverloadedOperatorDeclaration(NewFD)) { 5701 NewFD->setInvalidDecl(); 5702 return Redeclaration; 5703 } 5704 5705 // Extra checking for C++0x literal operators (C++0x [over.literal]). 5706 if (NewFD->getLiteralIdentifier() && 5707 CheckLiteralOperatorDeclaration(NewFD)) { 5708 NewFD->setInvalidDecl(); 5709 return Redeclaration; 5710 } 5711 5712 // In C++, check default arguments now that we have merged decls. Unless 5713 // the lexical context is the class, because in this case this is done 5714 // during delayed parsing anyway. 5715 if (!CurContext->isRecord()) 5716 CheckCXXDefaultArguments(NewFD); 5717 5718 // If this function declares a builtin function, check the type of this 5719 // declaration against the expected type for the builtin. 5720 if (unsigned BuiltinID = NewFD->getBuiltinID()) { 5721 ASTContext::GetBuiltinTypeError Error; 5722 QualType T = Context.GetBuiltinType(BuiltinID, Error); 5723 if (!T.isNull() && !Context.hasSameType(T, NewFD->getType())) { 5724 // The type of this function differs from the type of the builtin, 5725 // so forget about the builtin entirely. 5726 Context.BuiltinInfo.ForgetBuiltin(BuiltinID, Context.Idents); 5727 } 5728 } 5729 } 5730 return Redeclaration; 5731} 5732 5733void Sema::CheckMain(FunctionDecl* FD, const DeclSpec& DS) { 5734 // C++ [basic.start.main]p3: A program that declares main to be inline 5735 // or static is ill-formed. 5736 // C99 6.7.4p4: In a hosted environment, the inline function specifier 5737 // shall not appear in a declaration of main. 5738 // static main is not an error under C99, but we should warn about it. 5739 if (FD->getStorageClass() == SC_Static) 5740 Diag(DS.getStorageClassSpecLoc(), getLangOptions().CPlusPlus 5741 ? diag::err_static_main : diag::warn_static_main) 5742 << FixItHint::CreateRemoval(DS.getStorageClassSpecLoc()); 5743 if (FD->isInlineSpecified()) 5744 Diag(DS.getInlineSpecLoc(), diag::err_inline_main) 5745 << FixItHint::CreateRemoval(DS.getInlineSpecLoc()); 5746 5747 QualType T = FD->getType(); 5748 assert(T->isFunctionType() && "function decl is not of function type"); 5749 const FunctionType* FT = T->getAs<FunctionType>(); 5750 5751 if (!Context.hasSameUnqualifiedType(FT->getResultType(), Context.IntTy)) { 5752 Diag(FD->getTypeSpecStartLoc(), diag::err_main_returns_nonint); 5753 FD->setInvalidDecl(true); 5754 } 5755 5756 // Treat protoless main() as nullary. 5757 if (isa<FunctionNoProtoType>(FT)) return; 5758 5759 const FunctionProtoType* FTP = cast<const FunctionProtoType>(FT); 5760 unsigned nparams = FTP->getNumArgs(); 5761 assert(FD->getNumParams() == nparams); 5762 5763 bool HasExtraParameters = (nparams > 3); 5764 5765 // Darwin passes an undocumented fourth argument of type char**. If 5766 // other platforms start sprouting these, the logic below will start 5767 // getting shifty. 5768 if (nparams == 4 && Context.getTargetInfo().getTriple().isOSDarwin()) 5769 HasExtraParameters = false; 5770 5771 if (HasExtraParameters) { 5772 Diag(FD->getLocation(), diag::err_main_surplus_args) << nparams; 5773 FD->setInvalidDecl(true); 5774 nparams = 3; 5775 } 5776 5777 // FIXME: a lot of the following diagnostics would be improved 5778 // if we had some location information about types. 5779 5780 QualType CharPP = 5781 Context.getPointerType(Context.getPointerType(Context.CharTy)); 5782 QualType Expected[] = { Context.IntTy, CharPP, CharPP, CharPP }; 5783 5784 for (unsigned i = 0; i < nparams; ++i) { 5785 QualType AT = FTP->getArgType(i); 5786 5787 bool mismatch = true; 5788 5789 if (Context.hasSameUnqualifiedType(AT, Expected[i])) 5790 mismatch = false; 5791 else if (Expected[i] == CharPP) { 5792 // As an extension, the following forms are okay: 5793 // char const ** 5794 // char const * const * 5795 // char * const * 5796 5797 QualifierCollector qs; 5798 const PointerType* PT; 5799 if ((PT = qs.strip(AT)->getAs<PointerType>()) && 5800 (PT = qs.strip(PT->getPointeeType())->getAs<PointerType>()) && 5801 (QualType(qs.strip(PT->getPointeeType()), 0) == Context.CharTy)) { 5802 qs.removeConst(); 5803 mismatch = !qs.empty(); 5804 } 5805 } 5806 5807 if (mismatch) { 5808 Diag(FD->getLocation(), diag::err_main_arg_wrong) << i << Expected[i]; 5809 // TODO: suggest replacing given type with expected type 5810 FD->setInvalidDecl(true); 5811 } 5812 } 5813 5814 if (nparams == 1 && !FD->isInvalidDecl()) { 5815 Diag(FD->getLocation(), diag::warn_main_one_arg); 5816 } 5817 5818 if (!FD->isInvalidDecl() && FD->getDescribedFunctionTemplate()) { 5819 Diag(FD->getLocation(), diag::err_main_template_decl); 5820 FD->setInvalidDecl(); 5821 } 5822} 5823 5824bool Sema::CheckForConstantInitializer(Expr *Init, QualType DclT) { 5825 // FIXME: Need strict checking. In C89, we need to check for 5826 // any assignment, increment, decrement, function-calls, or 5827 // commas outside of a sizeof. In C99, it's the same list, 5828 // except that the aforementioned are allowed in unevaluated 5829 // expressions. Everything else falls under the 5830 // "may accept other forms of constant expressions" exception. 5831 // (We never end up here for C++, so the constant expression 5832 // rules there don't matter.) 5833 if (Init->isConstantInitializer(Context, false)) 5834 return false; 5835 Diag(Init->getExprLoc(), diag::err_init_element_not_constant) 5836 << Init->getSourceRange(); 5837 return true; 5838} 5839 5840namespace { 5841 // Visits an initialization expression to see if OrigDecl is evaluated in 5842 // its own initialization and throws a warning if it does. 5843 class SelfReferenceChecker 5844 : public EvaluatedExprVisitor<SelfReferenceChecker> { 5845 Sema &S; 5846 Decl *OrigDecl; 5847 bool isRecordType; 5848 bool isPODType; 5849 5850 public: 5851 typedef EvaluatedExprVisitor<SelfReferenceChecker> Inherited; 5852 5853 SelfReferenceChecker(Sema &S, Decl *OrigDecl) : Inherited(S.Context), 5854 S(S), OrigDecl(OrigDecl) { 5855 isPODType = false; 5856 isRecordType = false; 5857 if (ValueDecl *VD = dyn_cast<ValueDecl>(OrigDecl)) { 5858 isPODType = VD->getType().isPODType(S.Context); 5859 isRecordType = VD->getType()->isRecordType(); 5860 } 5861 } 5862 5863 void VisitExpr(Expr *E) { 5864 if (isa<ObjCMessageExpr>(*E)) return; 5865 if (isRecordType) { 5866 Expr *expr = E; 5867 if (MemberExpr *ME = dyn_cast<MemberExpr>(E)) { 5868 ValueDecl *VD = ME->getMemberDecl(); 5869 if (isa<EnumConstantDecl>(VD) || isa<VarDecl>(VD)) return; 5870 expr = ME->getBase(); 5871 } 5872 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(expr)) { 5873 HandleDeclRefExpr(DRE); 5874 return; 5875 } 5876 } 5877 Inherited::VisitExpr(E); 5878 } 5879 5880 void VisitMemberExpr(MemberExpr *E) { 5881 if (E->getType()->canDecayToPointerType()) return; 5882 if (isa<FieldDecl>(E->getMemberDecl())) 5883 if (DeclRefExpr *DRE 5884 = dyn_cast<DeclRefExpr>(E->getBase()->IgnoreParenImpCasts())) { 5885 HandleDeclRefExpr(DRE); 5886 return; 5887 } 5888 Inherited::VisitMemberExpr(E); 5889 } 5890 5891 void VisitImplicitCastExpr(ImplicitCastExpr *E) { 5892 if ((!isRecordType &&E->getCastKind() == CK_LValueToRValue) || 5893 (isRecordType && E->getCastKind() == CK_NoOp)) { 5894 Expr* SubExpr = E->getSubExpr()->IgnoreParenImpCasts(); 5895 if (MemberExpr *ME = dyn_cast<MemberExpr>(SubExpr)) 5896 SubExpr = ME->getBase()->IgnoreParenImpCasts(); 5897 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(SubExpr)) { 5898 HandleDeclRefExpr(DRE); 5899 return; 5900 } 5901 } 5902 Inherited::VisitImplicitCastExpr(E); 5903 } 5904 5905 void VisitUnaryOperator(UnaryOperator *E) { 5906 // For POD record types, addresses of its own members are well-defined. 5907 if (isRecordType && isPODType) return; 5908 Inherited::VisitUnaryOperator(E); 5909 } 5910 5911 void HandleDeclRefExpr(DeclRefExpr *DRE) { 5912 Decl* ReferenceDecl = DRE->getDecl(); 5913 if (OrigDecl != ReferenceDecl) return; 5914 LookupResult Result(S, DRE->getNameInfo(), Sema::LookupOrdinaryName, 5915 Sema::NotForRedeclaration); 5916 S.DiagRuntimeBehavior(DRE->getLocStart(), DRE, 5917 S.PDiag(diag::warn_uninit_self_reference_in_init) 5918 << Result.getLookupName() 5919 << OrigDecl->getLocation() 5920 << DRE->getSourceRange()); 5921 } 5922 }; 5923} 5924 5925/// CheckSelfReference - Warns if OrigDecl is used in expression E. 5926void Sema::CheckSelfReference(Decl* OrigDecl, Expr *E) { 5927 SelfReferenceChecker(*this, OrigDecl).VisitExpr(E); 5928} 5929 5930/// AddInitializerToDecl - Adds the initializer Init to the 5931/// declaration dcl. If DirectInit is true, this is C++ direct 5932/// initialization rather than copy initialization. 5933void Sema::AddInitializerToDecl(Decl *RealDecl, Expr *Init, 5934 bool DirectInit, bool TypeMayContainAuto) { 5935 // If there is no declaration, there was an error parsing it. Just ignore 5936 // the initializer. 5937 if (RealDecl == 0 || RealDecl->isInvalidDecl()) 5938 return; 5939 5940 // Check for self-references within variable initializers. 5941 if (VarDecl *vd = dyn_cast<VarDecl>(RealDecl)) { 5942 // Variables declared within a function/method body are handled 5943 // by a dataflow analysis. 5944 if (!vd->hasLocalStorage() && !vd->isStaticLocal()) 5945 CheckSelfReference(RealDecl, Init); 5946 } 5947 else { 5948 CheckSelfReference(RealDecl, Init); 5949 } 5950 5951 if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(RealDecl)) { 5952 // With declarators parsed the way they are, the parser cannot 5953 // distinguish between a normal initializer and a pure-specifier. 5954 // Thus this grotesque test. 5955 IntegerLiteral *IL; 5956 if ((IL = dyn_cast<IntegerLiteral>(Init)) && IL->getValue() == 0 && 5957 Context.getCanonicalType(IL->getType()) == Context.IntTy) 5958 CheckPureMethod(Method, Init->getSourceRange()); 5959 else { 5960 Diag(Method->getLocation(), diag::err_member_function_initialization) 5961 << Method->getDeclName() << Init->getSourceRange(); 5962 Method->setInvalidDecl(); 5963 } 5964 return; 5965 } 5966 5967 VarDecl *VDecl = dyn_cast<VarDecl>(RealDecl); 5968 if (!VDecl) { 5969 assert(!isa<FieldDecl>(RealDecl) && "field init shouldn't get here"); 5970 Diag(RealDecl->getLocation(), diag::err_illegal_initializer); 5971 RealDecl->setInvalidDecl(); 5972 return; 5973 } 5974 5975 // C++11 [decl.spec.auto]p6. Deduce the type which 'auto' stands in for. 5976 if (TypeMayContainAuto && VDecl->getType()->getContainedAutoType()) { 5977 TypeSourceInfo *DeducedType = 0; 5978 if (!DeduceAutoType(VDecl->getTypeSourceInfo(), Init, DeducedType)) 5979 Diag(VDecl->getLocation(), diag::err_auto_var_deduction_failure) 5980 << VDecl->getDeclName() << VDecl->getType() << Init->getType() 5981 << Init->getSourceRange(); 5982 if (!DeducedType) { 5983 RealDecl->setInvalidDecl(); 5984 return; 5985 } 5986 VDecl->setTypeSourceInfo(DeducedType); 5987 VDecl->setType(DeducedType->getType()); 5988 5989 // In ARC, infer lifetime. 5990 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(VDecl)) 5991 VDecl->setInvalidDecl(); 5992 5993 // If this is a redeclaration, check that the type we just deduced matches 5994 // the previously declared type. 5995 if (VarDecl *Old = VDecl->getPreviousDecl()) 5996 MergeVarDeclTypes(VDecl, Old); 5997 } 5998 5999 if (VDecl->isLocalVarDecl() && VDecl->hasExternalStorage()) { 6000 // C99 6.7.8p5. C++ has no such restriction, but that is a defect. 6001 Diag(VDecl->getLocation(), diag::err_block_extern_cant_init); 6002 VDecl->setInvalidDecl(); 6003 return; 6004 } 6005 6006 6007 // A definition must end up with a complete type, which means it must be 6008 // complete with the restriction that an array type might be completed by the 6009 // initializer; note that later code assumes this restriction. 6010 QualType BaseDeclType = VDecl->getType(); 6011 if (const ArrayType *Array = Context.getAsIncompleteArrayType(BaseDeclType)) 6012 BaseDeclType = Array->getElementType(); 6013 if (RequireCompleteType(VDecl->getLocation(), BaseDeclType, 6014 diag::err_typecheck_decl_incomplete_type)) { 6015 RealDecl->setInvalidDecl(); 6016 return; 6017 } 6018 6019 // The variable can not have an abstract class type. 6020 if (RequireNonAbstractType(VDecl->getLocation(), VDecl->getType(), 6021 diag::err_abstract_type_in_decl, 6022 AbstractVariableType)) 6023 VDecl->setInvalidDecl(); 6024 6025 const VarDecl *Def; 6026 if ((Def = VDecl->getDefinition()) && Def != VDecl) { 6027 Diag(VDecl->getLocation(), diag::err_redefinition) 6028 << VDecl->getDeclName(); 6029 Diag(Def->getLocation(), diag::note_previous_definition); 6030 VDecl->setInvalidDecl(); 6031 return; 6032 } 6033 6034 const VarDecl* PrevInit = 0; 6035 if (getLangOptions().CPlusPlus) { 6036 // C++ [class.static.data]p4 6037 // If a static data member is of const integral or const 6038 // enumeration type, its declaration in the class definition can 6039 // specify a constant-initializer which shall be an integral 6040 // constant expression (5.19). In that case, the member can appear 6041 // in integral constant expressions. The member shall still be 6042 // defined in a namespace scope if it is used in the program and the 6043 // namespace scope definition shall not contain an initializer. 6044 // 6045 // We already performed a redefinition check above, but for static 6046 // data members we also need to check whether there was an in-class 6047 // declaration with an initializer. 6048 if (VDecl->isStaticDataMember() && VDecl->getAnyInitializer(PrevInit)) { 6049 Diag(VDecl->getLocation(), diag::err_redefinition) 6050 << VDecl->getDeclName(); 6051 Diag(PrevInit->getLocation(), diag::note_previous_definition); 6052 return; 6053 } 6054 6055 if (VDecl->hasLocalStorage()) 6056 getCurFunction()->setHasBranchProtectedScope(); 6057 6058 if (DiagnoseUnexpandedParameterPack(Init, UPPC_Initializer)) { 6059 VDecl->setInvalidDecl(); 6060 return; 6061 } 6062 } 6063 6064 // OpenCL 1.1 6.5.2: "Variables allocated in the __local address space inside 6065 // a kernel function cannot be initialized." 6066 if (VDecl->getStorageClass() == SC_OpenCLWorkGroupLocal) { 6067 Diag(VDecl->getLocation(), diag::err_local_cant_init); 6068 VDecl->setInvalidDecl(); 6069 return; 6070 } 6071 6072 // Get the decls type and save a reference for later, since 6073 // CheckInitializerTypes may change it. 6074 QualType DclT = VDecl->getType(), SavT = DclT; 6075 6076 // Perform the initialization. 6077 if (!VDecl->isInvalidDecl()) { 6078 InitializedEntity Entity = InitializedEntity::InitializeVariable(VDecl); 6079 InitializationKind Kind 6080 = DirectInit ? InitializationKind::CreateDirect(VDecl->getLocation(), 6081 Init->getLocStart(), 6082 Init->getLocEnd()) 6083 : InitializationKind::CreateCopy(VDecl->getLocation(), 6084 Init->getLocStart()); 6085 6086 InitializationSequence InitSeq(*this, Entity, Kind, &Init, 1); 6087 ExprResult Result = InitSeq.Perform(*this, Entity, Kind, 6088 MultiExprArg(*this, &Init, 1), 6089 &DclT); 6090 if (Result.isInvalid()) { 6091 VDecl->setInvalidDecl(); 6092 return; 6093 } 6094 6095 Init = Result.takeAs<Expr>(); 6096 } 6097 6098 // If the type changed, it means we had an incomplete type that was 6099 // completed by the initializer. For example: 6100 // int ary[] = { 1, 3, 5 }; 6101 // "ary" transitions from an IncompleteArrayType to a ConstantArrayType. 6102 if (!VDecl->isInvalidDecl() && (DclT != SavT)) { 6103 VDecl->setType(DclT); 6104 Init->setType(DclT.getNonReferenceType()); 6105 } 6106 6107 // Check any implicit conversions within the expression. 6108 CheckImplicitConversions(Init, VDecl->getLocation()); 6109 6110 if (!VDecl->isInvalidDecl()) 6111 checkUnsafeAssigns(VDecl->getLocation(), VDecl->getType(), Init); 6112 6113 Init = MaybeCreateExprWithCleanups(Init); 6114 // Attach the initializer to the decl. 6115 VDecl->setInit(Init); 6116 6117 if (VDecl->isLocalVarDecl()) { 6118 // C99 6.7.8p4: All the expressions in an initializer for an object that has 6119 // static storage duration shall be constant expressions or string literals. 6120 // C++ does not have this restriction. 6121 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl() && 6122 VDecl->getStorageClass() == SC_Static) 6123 CheckForConstantInitializer(Init, DclT); 6124 } else if (VDecl->isStaticDataMember() && 6125 VDecl->getLexicalDeclContext()->isRecord()) { 6126 // This is an in-class initialization for a static data member, e.g., 6127 // 6128 // struct S { 6129 // static const int value = 17; 6130 // }; 6131 6132 // C++ [class.mem]p4: 6133 // A member-declarator can contain a constant-initializer only 6134 // if it declares a static member (9.4) of const integral or 6135 // const enumeration type, see 9.4.2. 6136 // 6137 // C++11 [class.static.data]p3: 6138 // If a non-volatile const static data member is of integral or 6139 // enumeration type, its declaration in the class definition can 6140 // specify a brace-or-equal-initializer in which every initalizer-clause 6141 // that is an assignment-expression is a constant expression. A static 6142 // data member of literal type can be declared in the class definition 6143 // with the constexpr specifier; if so, its declaration shall specify a 6144 // brace-or-equal-initializer in which every initializer-clause that is 6145 // an assignment-expression is a constant expression. 6146 6147 // Do nothing on dependent types. 6148 if (DclT->isDependentType()) { 6149 6150 // Allow any 'static constexpr' members, whether or not they are of literal 6151 // type. We separately check that the initializer is a constant expression, 6152 // which implicitly requires the member to be of literal type. 6153 } else if (VDecl->isConstexpr()) { 6154 6155 // Require constness. 6156 } else if (!DclT.isConstQualified()) { 6157 Diag(VDecl->getLocation(), diag::err_in_class_initializer_non_const) 6158 << Init->getSourceRange(); 6159 VDecl->setInvalidDecl(); 6160 6161 // We allow integer constant expressions in all cases. 6162 } else if (DclT->isIntegralOrEnumerationType()) { 6163 // Check whether the expression is a constant expression. 6164 SourceLocation Loc; 6165 if (getLangOptions().CPlusPlus0x && DclT.isVolatileQualified()) 6166 // In C++11, a non-constexpr const static data member with an 6167 // in-class initializer cannot be volatile. 6168 Diag(VDecl->getLocation(), diag::err_in_class_initializer_volatile); 6169 else if (Init->isValueDependent()) 6170 ; // Nothing to check. 6171 else if (Init->isIntegerConstantExpr(Context, &Loc)) 6172 ; // Ok, it's an ICE! 6173 else if (Init->isEvaluatable(Context)) { 6174 // If we can constant fold the initializer through heroics, accept it, 6175 // but report this as a use of an extension for -pedantic. 6176 Diag(Loc, diag::ext_in_class_initializer_non_constant) 6177 << Init->getSourceRange(); 6178 } else { 6179 // Otherwise, this is some crazy unknown case. Report the issue at the 6180 // location provided by the isIntegerConstantExpr failed check. 6181 Diag(Loc, diag::err_in_class_initializer_non_constant) 6182 << Init->getSourceRange(); 6183 VDecl->setInvalidDecl(); 6184 } 6185 6186 // We allow foldable floating-point constants as an extension. 6187 } else if (DclT->isFloatingType()) { // also permits complex, which is ok 6188 Diag(VDecl->getLocation(), diag::ext_in_class_initializer_float_type) 6189 << DclT << Init->getSourceRange(); 6190 if (getLangOptions().CPlusPlus0x) 6191 Diag(VDecl->getLocation(), 6192 diag::note_in_class_initializer_float_type_constexpr) 6193 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr "); 6194 6195 if (!Init->isValueDependent() && !Init->isEvaluatable(Context)) { 6196 Diag(Init->getExprLoc(), diag::err_in_class_initializer_non_constant) 6197 << Init->getSourceRange(); 6198 VDecl->setInvalidDecl(); 6199 } 6200 6201 // Suggest adding 'constexpr' in C++11 for literal types. 6202 } else if (getLangOptions().CPlusPlus0x && DclT->isLiteralType()) { 6203 Diag(VDecl->getLocation(), diag::err_in_class_initializer_literal_type) 6204 << DclT << Init->getSourceRange() 6205 << FixItHint::CreateInsertion(VDecl->getLocStart(), "constexpr "); 6206 VDecl->setConstexpr(true); 6207 6208 } else { 6209 Diag(VDecl->getLocation(), diag::err_in_class_initializer_bad_type) 6210 << DclT << Init->getSourceRange(); 6211 VDecl->setInvalidDecl(); 6212 } 6213 } else if (VDecl->isFileVarDecl()) { 6214 if (VDecl->getStorageClassAsWritten() == SC_Extern && 6215 (!getLangOptions().CPlusPlus || 6216 !Context.getBaseElementType(VDecl->getType()).isConstQualified())) 6217 Diag(VDecl->getLocation(), diag::warn_extern_init); 6218 6219 // C99 6.7.8p4. All file scoped initializers need to be constant. 6220 if (!getLangOptions().CPlusPlus && !VDecl->isInvalidDecl()) 6221 CheckForConstantInitializer(Init, DclT); 6222 } 6223 6224 CheckCompleteVariableDeclaration(VDecl); 6225} 6226 6227/// ActOnInitializerError - Given that there was an error parsing an 6228/// initializer for the given declaration, try to return to some form 6229/// of sanity. 6230void Sema::ActOnInitializerError(Decl *D) { 6231 // Our main concern here is re-establishing invariants like "a 6232 // variable's type is either dependent or complete". 6233 if (!D || D->isInvalidDecl()) return; 6234 6235 VarDecl *VD = dyn_cast<VarDecl>(D); 6236 if (!VD) return; 6237 6238 // Auto types are meaningless if we can't make sense of the initializer. 6239 if (ParsingInitForAutoVars.count(D)) { 6240 D->setInvalidDecl(); 6241 return; 6242 } 6243 6244 QualType Ty = VD->getType(); 6245 if (Ty->isDependentType()) return; 6246 6247 // Require a complete type. 6248 if (RequireCompleteType(VD->getLocation(), 6249 Context.getBaseElementType(Ty), 6250 diag::err_typecheck_decl_incomplete_type)) { 6251 VD->setInvalidDecl(); 6252 return; 6253 } 6254 6255 // Require an abstract type. 6256 if (RequireNonAbstractType(VD->getLocation(), Ty, 6257 diag::err_abstract_type_in_decl, 6258 AbstractVariableType)) { 6259 VD->setInvalidDecl(); 6260 return; 6261 } 6262 6263 // Don't bother complaining about constructors or destructors, 6264 // though. 6265} 6266 6267void Sema::ActOnUninitializedDecl(Decl *RealDecl, 6268 bool TypeMayContainAuto) { 6269 // If there is no declaration, there was an error parsing it. Just ignore it. 6270 if (RealDecl == 0) 6271 return; 6272 6273 if (VarDecl *Var = dyn_cast<VarDecl>(RealDecl)) { 6274 QualType Type = Var->getType(); 6275 6276 // C++11 [dcl.spec.auto]p3 6277 if (TypeMayContainAuto && Type->getContainedAutoType()) { 6278 Diag(Var->getLocation(), diag::err_auto_var_requires_init) 6279 << Var->getDeclName() << Type; 6280 Var->setInvalidDecl(); 6281 return; 6282 } 6283 6284 // C++11 [class.static.data]p3: A static data member can be declared with 6285 // the constexpr specifier; if so, its declaration shall specify 6286 // a brace-or-equal-initializer. 6287 // C++11 [dcl.constexpr]p1: The constexpr specifier shall be applied only to 6288 // the definition of a variable [...] or the declaration of a static data 6289 // member. 6290 if (Var->isConstexpr() && !Var->isThisDeclarationADefinition()) { 6291 if (Var->isStaticDataMember()) 6292 Diag(Var->getLocation(), 6293 diag::err_constexpr_static_mem_var_requires_init) 6294 << Var->getDeclName(); 6295 else 6296 Diag(Var->getLocation(), diag::err_invalid_constexpr_var_decl); 6297 Var->setInvalidDecl(); 6298 return; 6299 } 6300 6301 switch (Var->isThisDeclarationADefinition()) { 6302 case VarDecl::Definition: 6303 if (!Var->isStaticDataMember() || !Var->getAnyInitializer()) 6304 break; 6305 6306 // We have an out-of-line definition of a static data member 6307 // that has an in-class initializer, so we type-check this like 6308 // a declaration. 6309 // 6310 // Fall through 6311 6312 case VarDecl::DeclarationOnly: 6313 // It's only a declaration. 6314 6315 // Block scope. C99 6.7p7: If an identifier for an object is 6316 // declared with no linkage (C99 6.2.2p6), the type for the 6317 // object shall be complete. 6318 if (!Type->isDependentType() && Var->isLocalVarDecl() && 6319 !Var->getLinkage() && !Var->isInvalidDecl() && 6320 RequireCompleteType(Var->getLocation(), Type, 6321 diag::err_typecheck_decl_incomplete_type)) 6322 Var->setInvalidDecl(); 6323 6324 // Make sure that the type is not abstract. 6325 if (!Type->isDependentType() && !Var->isInvalidDecl() && 6326 RequireNonAbstractType(Var->getLocation(), Type, 6327 diag::err_abstract_type_in_decl, 6328 AbstractVariableType)) 6329 Var->setInvalidDecl(); 6330 return; 6331 6332 case VarDecl::TentativeDefinition: 6333 // File scope. C99 6.9.2p2: A declaration of an identifier for an 6334 // object that has file scope without an initializer, and without a 6335 // storage-class specifier or with the storage-class specifier "static", 6336 // constitutes a tentative definition. Note: A tentative definition with 6337 // external linkage is valid (C99 6.2.2p5). 6338 if (!Var->isInvalidDecl()) { 6339 if (const IncompleteArrayType *ArrayT 6340 = Context.getAsIncompleteArrayType(Type)) { 6341 if (RequireCompleteType(Var->getLocation(), 6342 ArrayT->getElementType(), 6343 diag::err_illegal_decl_array_incomplete_type)) 6344 Var->setInvalidDecl(); 6345 } else if (Var->getStorageClass() == SC_Static) { 6346 // C99 6.9.2p3: If the declaration of an identifier for an object is 6347 // a tentative definition and has internal linkage (C99 6.2.2p3), the 6348 // declared type shall not be an incomplete type. 6349 // NOTE: code such as the following 6350 // static struct s; 6351 // struct s { int a; }; 6352 // is accepted by gcc. Hence here we issue a warning instead of 6353 // an error and we do not invalidate the static declaration. 6354 // NOTE: to avoid multiple warnings, only check the first declaration. 6355 if (Var->getPreviousDecl() == 0) 6356 RequireCompleteType(Var->getLocation(), Type, 6357 diag::ext_typecheck_decl_incomplete_type); 6358 } 6359 } 6360 6361 // Record the tentative definition; we're done. 6362 if (!Var->isInvalidDecl()) 6363 TentativeDefinitions.push_back(Var); 6364 return; 6365 } 6366 6367 // Provide a specific diagnostic for uninitialized variable 6368 // definitions with incomplete array type. 6369 if (Type->isIncompleteArrayType()) { 6370 Diag(Var->getLocation(), 6371 diag::err_typecheck_incomplete_array_needs_initializer); 6372 Var->setInvalidDecl(); 6373 return; 6374 } 6375 6376 // Provide a specific diagnostic for uninitialized variable 6377 // definitions with reference type. 6378 if (Type->isReferenceType()) { 6379 Diag(Var->getLocation(), diag::err_reference_var_requires_init) 6380 << Var->getDeclName() 6381 << SourceRange(Var->getLocation(), Var->getLocation()); 6382 Var->setInvalidDecl(); 6383 return; 6384 } 6385 6386 // Do not attempt to type-check the default initializer for a 6387 // variable with dependent type. 6388 if (Type->isDependentType()) 6389 return; 6390 6391 if (Var->isInvalidDecl()) 6392 return; 6393 6394 if (RequireCompleteType(Var->getLocation(), 6395 Context.getBaseElementType(Type), 6396 diag::err_typecheck_decl_incomplete_type)) { 6397 Var->setInvalidDecl(); 6398 return; 6399 } 6400 6401 // The variable can not have an abstract class type. 6402 if (RequireNonAbstractType(Var->getLocation(), Type, 6403 diag::err_abstract_type_in_decl, 6404 AbstractVariableType)) { 6405 Var->setInvalidDecl(); 6406 return; 6407 } 6408 6409 // Check for jumps past the implicit initializer. C++0x 6410 // clarifies that this applies to a "variable with automatic 6411 // storage duration", not a "local variable". 6412 // C++11 [stmt.dcl]p3 6413 // A program that jumps from a point where a variable with automatic 6414 // storage duration is not in scope to a point where it is in scope is 6415 // ill-formed unless the variable has scalar type, class type with a 6416 // trivial default constructor and a trivial destructor, a cv-qualified 6417 // version of one of these types, or an array of one of the preceding 6418 // types and is declared without an initializer. 6419 if (getLangOptions().CPlusPlus && Var->hasLocalStorage()) { 6420 if (const RecordType *Record 6421 = Context.getBaseElementType(Type)->getAs<RecordType>()) { 6422 CXXRecordDecl *CXXRecord = cast<CXXRecordDecl>(Record->getDecl()); 6423 // Mark the function for further checking even if the looser rules of 6424 // C++11 do not require such checks, so that we can diagnose 6425 // incompatibilities with C++98. 6426 if (!CXXRecord->isPOD()) 6427 getCurFunction()->setHasBranchProtectedScope(); 6428 } 6429 } 6430 6431 // C++03 [dcl.init]p9: 6432 // If no initializer is specified for an object, and the 6433 // object is of (possibly cv-qualified) non-POD class type (or 6434 // array thereof), the object shall be default-initialized; if 6435 // the object is of const-qualified type, the underlying class 6436 // type shall have a user-declared default 6437 // constructor. Otherwise, if no initializer is specified for 6438 // a non- static object, the object and its subobjects, if 6439 // any, have an indeterminate initial value); if the object 6440 // or any of its subobjects are of const-qualified type, the 6441 // program is ill-formed. 6442 // C++0x [dcl.init]p11: 6443 // If no initializer is specified for an object, the object is 6444 // default-initialized; [...]. 6445 InitializedEntity Entity = InitializedEntity::InitializeVariable(Var); 6446 InitializationKind Kind 6447 = InitializationKind::CreateDefault(Var->getLocation()); 6448 6449 InitializationSequence InitSeq(*this, Entity, Kind, 0, 0); 6450 ExprResult Init = InitSeq.Perform(*this, Entity, Kind, 6451 MultiExprArg(*this, 0, 0)); 6452 if (Init.isInvalid()) 6453 Var->setInvalidDecl(); 6454 else if (Init.get()) 6455 Var->setInit(MaybeCreateExprWithCleanups(Init.get())); 6456 6457 CheckCompleteVariableDeclaration(Var); 6458 } 6459} 6460 6461void Sema::ActOnCXXForRangeDecl(Decl *D) { 6462 VarDecl *VD = dyn_cast<VarDecl>(D); 6463 if (!VD) { 6464 Diag(D->getLocation(), diag::err_for_range_decl_must_be_var); 6465 D->setInvalidDecl(); 6466 return; 6467 } 6468 6469 VD->setCXXForRangeDecl(true); 6470 6471 // for-range-declaration cannot be given a storage class specifier. 6472 int Error = -1; 6473 switch (VD->getStorageClassAsWritten()) { 6474 case SC_None: 6475 break; 6476 case SC_Extern: 6477 Error = 0; 6478 break; 6479 case SC_Static: 6480 Error = 1; 6481 break; 6482 case SC_PrivateExtern: 6483 Error = 2; 6484 break; 6485 case SC_Auto: 6486 Error = 3; 6487 break; 6488 case SC_Register: 6489 Error = 4; 6490 break; 6491 case SC_OpenCLWorkGroupLocal: 6492 llvm_unreachable("Unexpected storage class"); 6493 } 6494 if (VD->isConstexpr()) 6495 Error = 5; 6496 if (Error != -1) { 6497 Diag(VD->getOuterLocStart(), diag::err_for_range_storage_class) 6498 << VD->getDeclName() << Error; 6499 D->setInvalidDecl(); 6500 } 6501} 6502 6503void Sema::CheckCompleteVariableDeclaration(VarDecl *var) { 6504 if (var->isInvalidDecl()) return; 6505 6506 // In ARC, don't allow jumps past the implicit initialization of a 6507 // local retaining variable. 6508 if (getLangOptions().ObjCAutoRefCount && 6509 var->hasLocalStorage()) { 6510 switch (var->getType().getObjCLifetime()) { 6511 case Qualifiers::OCL_None: 6512 case Qualifiers::OCL_ExplicitNone: 6513 case Qualifiers::OCL_Autoreleasing: 6514 break; 6515 6516 case Qualifiers::OCL_Weak: 6517 case Qualifiers::OCL_Strong: 6518 getCurFunction()->setHasBranchProtectedScope(); 6519 break; 6520 } 6521 } 6522 6523 // All the following checks are C++ only. 6524 if (!getLangOptions().CPlusPlus) return; 6525 6526 QualType baseType = Context.getBaseElementType(var->getType()); 6527 if (baseType->isDependentType()) return; 6528 6529 // __block variables might require us to capture a copy-initializer. 6530 if (var->hasAttr<BlocksAttr>()) { 6531 // It's currently invalid to ever have a __block variable with an 6532 // array type; should we diagnose that here? 6533 6534 // Regardless, we don't want to ignore array nesting when 6535 // constructing this copy. 6536 QualType type = var->getType(); 6537 6538 if (type->isStructureOrClassType()) { 6539 SourceLocation poi = var->getLocation(); 6540 Expr *varRef = new (Context) DeclRefExpr(var, type, VK_LValue, poi); 6541 ExprResult result = 6542 PerformCopyInitialization( 6543 InitializedEntity::InitializeBlock(poi, type, false), 6544 poi, Owned(varRef)); 6545 if (!result.isInvalid()) { 6546 result = MaybeCreateExprWithCleanups(result); 6547 Expr *init = result.takeAs<Expr>(); 6548 Context.setBlockVarCopyInits(var, init); 6549 } 6550 } 6551 } 6552 6553 Expr *Init = var->getInit(); 6554 bool IsGlobal = var->hasGlobalStorage() && !var->isStaticLocal(); 6555 6556 if (!var->getDeclContext()->isDependentContext() && Init) { 6557 if (IsGlobal && !var->isConstexpr() && 6558 getDiagnostics().getDiagnosticLevel(diag::warn_global_constructor, 6559 var->getLocation()) 6560 != DiagnosticsEngine::Ignored && 6561 !Init->isConstantInitializer(Context, baseType->isReferenceType())) 6562 Diag(var->getLocation(), diag::warn_global_constructor) 6563 << Init->getSourceRange(); 6564 6565 if (var->isConstexpr()) { 6566 llvm::SmallVector<PartialDiagnosticAt, 8> Notes; 6567 if (!var->evaluateValue(Notes) || !var->isInitICE()) { 6568 SourceLocation DiagLoc = var->getLocation(); 6569 // If the note doesn't add any useful information other than a source 6570 // location, fold it into the primary diagnostic. 6571 if (Notes.size() == 1 && Notes[0].second.getDiagID() == 6572 diag::note_invalid_subexpr_in_const_expr) { 6573 DiagLoc = Notes[0].first; 6574 Notes.clear(); 6575 } 6576 Diag(DiagLoc, diag::err_constexpr_var_requires_const_init) 6577 << var << Init->getSourceRange(); 6578 for (unsigned I = 0, N = Notes.size(); I != N; ++I) 6579 Diag(Notes[I].first, Notes[I].second); 6580 } 6581 } else if (var->isUsableInConstantExpressions()) { 6582 // Check whether the initializer of a const variable of integral or 6583 // enumeration type is an ICE now, since we can't tell whether it was 6584 // initialized by a constant expression if we check later. 6585 var->checkInitIsICE(); 6586 } 6587 } 6588 6589 // Require the destructor. 6590 if (const RecordType *recordType = baseType->getAs<RecordType>()) 6591 FinalizeVarWithDestructor(var, recordType); 6592} 6593 6594/// FinalizeDeclaration - called by ParseDeclarationAfterDeclarator to perform 6595/// any semantic actions necessary after any initializer has been attached. 6596void 6597Sema::FinalizeDeclaration(Decl *ThisDecl) { 6598 // Note that we are no longer parsing the initializer for this declaration. 6599 ParsingInitForAutoVars.erase(ThisDecl); 6600} 6601 6602Sema::DeclGroupPtrTy 6603Sema::FinalizeDeclaratorGroup(Scope *S, const DeclSpec &DS, 6604 Decl **Group, unsigned NumDecls) { 6605 SmallVector<Decl*, 8> Decls; 6606 6607 if (DS.isTypeSpecOwned()) 6608 Decls.push_back(DS.getRepAsDecl()); 6609 6610 for (unsigned i = 0; i != NumDecls; ++i) 6611 if (Decl *D = Group[i]) 6612 Decls.push_back(D); 6613 6614 return BuildDeclaratorGroup(Decls.data(), Decls.size(), 6615 DS.getTypeSpecType() == DeclSpec::TST_auto); 6616} 6617 6618/// BuildDeclaratorGroup - convert a list of declarations into a declaration 6619/// group, performing any necessary semantic checking. 6620Sema::DeclGroupPtrTy 6621Sema::BuildDeclaratorGroup(Decl **Group, unsigned NumDecls, 6622 bool TypeMayContainAuto) { 6623 // C++0x [dcl.spec.auto]p7: 6624 // If the type deduced for the template parameter U is not the same in each 6625 // deduction, the program is ill-formed. 6626 // FIXME: When initializer-list support is added, a distinction is needed 6627 // between the deduced type U and the deduced type which 'auto' stands for. 6628 // auto a = 0, b = { 1, 2, 3 }; 6629 // is legal because the deduced type U is 'int' in both cases. 6630 if (TypeMayContainAuto && NumDecls > 1) { 6631 QualType Deduced; 6632 CanQualType DeducedCanon; 6633 VarDecl *DeducedDecl = 0; 6634 for (unsigned i = 0; i != NumDecls; ++i) { 6635 if (VarDecl *D = dyn_cast<VarDecl>(Group[i])) { 6636 AutoType *AT = D->getType()->getContainedAutoType(); 6637 // Don't reissue diagnostics when instantiating a template. 6638 if (AT && D->isInvalidDecl()) 6639 break; 6640 if (AT && AT->isDeduced()) { 6641 QualType U = AT->getDeducedType(); 6642 CanQualType UCanon = Context.getCanonicalType(U); 6643 if (Deduced.isNull()) { 6644 Deduced = U; 6645 DeducedCanon = UCanon; 6646 DeducedDecl = D; 6647 } else if (DeducedCanon != UCanon) { 6648 Diag(D->getTypeSourceInfo()->getTypeLoc().getBeginLoc(), 6649 diag::err_auto_different_deductions) 6650 << Deduced << DeducedDecl->getDeclName() 6651 << U << D->getDeclName() 6652 << DeducedDecl->getInit()->getSourceRange() 6653 << D->getInit()->getSourceRange(); 6654 D->setInvalidDecl(); 6655 break; 6656 } 6657 } 6658 } 6659 } 6660 } 6661 6662 return DeclGroupPtrTy::make(DeclGroupRef::Create(Context, Group, NumDecls)); 6663} 6664 6665 6666/// ActOnParamDeclarator - Called from Parser::ParseFunctionDeclarator() 6667/// to introduce parameters into function prototype scope. 6668Decl *Sema::ActOnParamDeclarator(Scope *S, Declarator &D) { 6669 const DeclSpec &DS = D.getDeclSpec(); 6670 6671 // Verify C99 6.7.5.3p2: The only SCS allowed is 'register'. 6672 // C++03 [dcl.stc]p2 also permits 'auto'. 6673 VarDecl::StorageClass StorageClass = SC_None; 6674 VarDecl::StorageClass StorageClassAsWritten = SC_None; 6675 if (DS.getStorageClassSpec() == DeclSpec::SCS_register) { 6676 StorageClass = SC_Register; 6677 StorageClassAsWritten = SC_Register; 6678 } else if (getLangOptions().CPlusPlus && 6679 DS.getStorageClassSpec() == DeclSpec::SCS_auto) { 6680 StorageClass = SC_Auto; 6681 StorageClassAsWritten = SC_Auto; 6682 } else if (DS.getStorageClassSpec() != DeclSpec::SCS_unspecified) { 6683 Diag(DS.getStorageClassSpecLoc(), 6684 diag::err_invalid_storage_class_in_func_decl); 6685 D.getMutableDeclSpec().ClearStorageClassSpecs(); 6686 } 6687 6688 if (D.getDeclSpec().isThreadSpecified()) 6689 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 6690 if (D.getDeclSpec().isConstexprSpecified()) 6691 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 6692 << 0; 6693 6694 DiagnoseFunctionSpecifiers(D); 6695 6696 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 6697 QualType parmDeclType = TInfo->getType(); 6698 6699 if (getLangOptions().CPlusPlus) { 6700 // Check that there are no default arguments inside the type of this 6701 // parameter. 6702 CheckExtraCXXDefaultArguments(D); 6703 6704 // Parameter declarators cannot be qualified (C++ [dcl.meaning]p1). 6705 if (D.getCXXScopeSpec().isSet()) { 6706 Diag(D.getIdentifierLoc(), diag::err_qualified_param_declarator) 6707 << D.getCXXScopeSpec().getRange(); 6708 D.getCXXScopeSpec().clear(); 6709 } 6710 } 6711 6712 // Ensure we have a valid name 6713 IdentifierInfo *II = 0; 6714 if (D.hasName()) { 6715 II = D.getIdentifier(); 6716 if (!II) { 6717 Diag(D.getIdentifierLoc(), diag::err_bad_parameter_name) 6718 << GetNameForDeclarator(D).getName().getAsString(); 6719 D.setInvalidType(true); 6720 } 6721 } 6722 6723 // Check for redeclaration of parameters, e.g. int foo(int x, int x); 6724 if (II) { 6725 LookupResult R(*this, II, D.getIdentifierLoc(), LookupOrdinaryName, 6726 ForRedeclaration); 6727 LookupName(R, S); 6728 if (R.isSingleResult()) { 6729 NamedDecl *PrevDecl = R.getFoundDecl(); 6730 if (PrevDecl->isTemplateParameter()) { 6731 // Maybe we will complain about the shadowed template parameter. 6732 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 6733 // Just pretend that we didn't see the previous declaration. 6734 PrevDecl = 0; 6735 } else if (S->isDeclScope(PrevDecl)) { 6736 Diag(D.getIdentifierLoc(), diag::err_param_redefinition) << II; 6737 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 6738 6739 // Recover by removing the name 6740 II = 0; 6741 D.SetIdentifier(0, D.getIdentifierLoc()); 6742 D.setInvalidType(true); 6743 } 6744 } 6745 } 6746 6747 // Temporarily put parameter variables in the translation unit, not 6748 // the enclosing context. This prevents them from accidentally 6749 // looking like class members in C++. 6750 ParmVarDecl *New = CheckParameter(Context.getTranslationUnitDecl(), 6751 D.getSourceRange().getBegin(), 6752 D.getIdentifierLoc(), II, 6753 parmDeclType, TInfo, 6754 StorageClass, StorageClassAsWritten); 6755 6756 if (D.isInvalidType()) 6757 New->setInvalidDecl(); 6758 6759 assert(S->isFunctionPrototypeScope()); 6760 assert(S->getFunctionPrototypeDepth() >= 1); 6761 New->setScopeInfo(S->getFunctionPrototypeDepth() - 1, 6762 S->getNextFunctionPrototypeIndex()); 6763 6764 // Add the parameter declaration into this scope. 6765 S->AddDecl(New); 6766 if (II) 6767 IdResolver.AddDecl(New); 6768 6769 ProcessDeclAttributes(S, New, D); 6770 6771 if (D.getDeclSpec().isModulePrivateSpecified()) 6772 Diag(New->getLocation(), diag::err_module_private_local) 6773 << 1 << New->getDeclName() 6774 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 6775 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 6776 6777 if (New->hasAttr<BlocksAttr>()) { 6778 Diag(New->getLocation(), diag::err_block_on_nonlocal); 6779 } 6780 return New; 6781} 6782 6783/// \brief Synthesizes a variable for a parameter arising from a 6784/// typedef. 6785ParmVarDecl *Sema::BuildParmVarDeclForTypedef(DeclContext *DC, 6786 SourceLocation Loc, 6787 QualType T) { 6788 /* FIXME: setting StartLoc == Loc. 6789 Would it be worth to modify callers so as to provide proper source 6790 location for the unnamed parameters, embedding the parameter's type? */ 6791 ParmVarDecl *Param = ParmVarDecl::Create(Context, DC, Loc, Loc, 0, 6792 T, Context.getTrivialTypeSourceInfo(T, Loc), 6793 SC_None, SC_None, 0); 6794 Param->setImplicit(); 6795 return Param; 6796} 6797 6798void Sema::DiagnoseUnusedParameters(ParmVarDecl * const *Param, 6799 ParmVarDecl * const *ParamEnd) { 6800 // Don't diagnose unused-parameter errors in template instantiations; we 6801 // will already have done so in the template itself. 6802 if (!ActiveTemplateInstantiations.empty()) 6803 return; 6804 6805 for (; Param != ParamEnd; ++Param) { 6806 if (!(*Param)->isReferenced() && (*Param)->getDeclName() && 6807 !(*Param)->hasAttr<UnusedAttr>()) { 6808 Diag((*Param)->getLocation(), diag::warn_unused_parameter) 6809 << (*Param)->getDeclName(); 6810 } 6811 } 6812} 6813 6814void Sema::DiagnoseSizeOfParametersAndReturnValue(ParmVarDecl * const *Param, 6815 ParmVarDecl * const *ParamEnd, 6816 QualType ReturnTy, 6817 NamedDecl *D) { 6818 if (LangOpts.NumLargeByValueCopy == 0) // No check. 6819 return; 6820 6821 // Warn if the return value is pass-by-value and larger than the specified 6822 // threshold. 6823 if (!ReturnTy->isDependentType() && ReturnTy.isPODType(Context)) { 6824 unsigned Size = Context.getTypeSizeInChars(ReturnTy).getQuantity(); 6825 if (Size > LangOpts.NumLargeByValueCopy) 6826 Diag(D->getLocation(), diag::warn_return_value_size) 6827 << D->getDeclName() << Size; 6828 } 6829 6830 // Warn if any parameter is pass-by-value and larger than the specified 6831 // threshold. 6832 for (; Param != ParamEnd; ++Param) { 6833 QualType T = (*Param)->getType(); 6834 if (T->isDependentType() || !T.isPODType(Context)) 6835 continue; 6836 unsigned Size = Context.getTypeSizeInChars(T).getQuantity(); 6837 if (Size > LangOpts.NumLargeByValueCopy) 6838 Diag((*Param)->getLocation(), diag::warn_parameter_size) 6839 << (*Param)->getDeclName() << Size; 6840 } 6841} 6842 6843ParmVarDecl *Sema::CheckParameter(DeclContext *DC, SourceLocation StartLoc, 6844 SourceLocation NameLoc, IdentifierInfo *Name, 6845 QualType T, TypeSourceInfo *TSInfo, 6846 VarDecl::StorageClass StorageClass, 6847 VarDecl::StorageClass StorageClassAsWritten) { 6848 // In ARC, infer a lifetime qualifier for appropriate parameter types. 6849 if (getLangOptions().ObjCAutoRefCount && 6850 T.getObjCLifetime() == Qualifiers::OCL_None && 6851 T->isObjCLifetimeType()) { 6852 6853 Qualifiers::ObjCLifetime lifetime; 6854 6855 // Special cases for arrays: 6856 // - if it's const, use __unsafe_unretained 6857 // - otherwise, it's an error 6858 if (T->isArrayType()) { 6859 if (!T.isConstQualified()) { 6860 DelayedDiagnostics.add( 6861 sema::DelayedDiagnostic::makeForbiddenType( 6862 NameLoc, diag::err_arc_array_param_no_ownership, T, false)); 6863 } 6864 lifetime = Qualifiers::OCL_ExplicitNone; 6865 } else { 6866 lifetime = T->getObjCARCImplicitLifetime(); 6867 } 6868 T = Context.getLifetimeQualifiedType(T, lifetime); 6869 } 6870 6871 ParmVarDecl *New = ParmVarDecl::Create(Context, DC, StartLoc, NameLoc, Name, 6872 Context.getAdjustedParameterType(T), 6873 TSInfo, 6874 StorageClass, StorageClassAsWritten, 6875 0); 6876 6877 // Parameters can not be abstract class types. 6878 // For record types, this is done by the AbstractClassUsageDiagnoser once 6879 // the class has been completely parsed. 6880 if (!CurContext->isRecord() && 6881 RequireNonAbstractType(NameLoc, T, diag::err_abstract_type_in_decl, 6882 AbstractParamType)) 6883 New->setInvalidDecl(); 6884 6885 // Parameter declarators cannot be interface types. All ObjC objects are 6886 // passed by reference. 6887 if (T->isObjCObjectType()) { 6888 Diag(NameLoc, 6889 diag::err_object_cannot_be_passed_returned_by_value) << 1 << T 6890 << FixItHint::CreateInsertion(NameLoc, "*"); 6891 T = Context.getObjCObjectPointerType(T); 6892 New->setType(T); 6893 } 6894 6895 // ISO/IEC TR 18037 S6.7.3: "The type of an object with automatic storage 6896 // duration shall not be qualified by an address-space qualifier." 6897 // Since all parameters have automatic store duration, they can not have 6898 // an address space. 6899 if (T.getAddressSpace() != 0) { 6900 Diag(NameLoc, diag::err_arg_with_address_space); 6901 New->setInvalidDecl(); 6902 } 6903 6904 return New; 6905} 6906 6907void Sema::ActOnFinishKNRParamDeclarations(Scope *S, Declarator &D, 6908 SourceLocation LocAfterDecls) { 6909 DeclaratorChunk::FunctionTypeInfo &FTI = D.getFunctionTypeInfo(); 6910 6911 // Verify 6.9.1p6: 'every identifier in the identifier list shall be declared' 6912 // for a K&R function. 6913 if (!FTI.hasPrototype) { 6914 for (int i = FTI.NumArgs; i != 0; /* decrement in loop */) { 6915 --i; 6916 if (FTI.ArgInfo[i].Param == 0) { 6917 llvm::SmallString<256> Code; 6918 llvm::raw_svector_ostream(Code) << " int " 6919 << FTI.ArgInfo[i].Ident->getName() 6920 << ";\n"; 6921 Diag(FTI.ArgInfo[i].IdentLoc, diag::ext_param_not_declared) 6922 << FTI.ArgInfo[i].Ident 6923 << FixItHint::CreateInsertion(LocAfterDecls, Code.str()); 6924 6925 // Implicitly declare the argument as type 'int' for lack of a better 6926 // type. 6927 AttributeFactory attrs; 6928 DeclSpec DS(attrs); 6929 const char* PrevSpec; // unused 6930 unsigned DiagID; // unused 6931 DS.SetTypeSpecType(DeclSpec::TST_int, FTI.ArgInfo[i].IdentLoc, 6932 PrevSpec, DiagID); 6933 Declarator ParamD(DS, Declarator::KNRTypeListContext); 6934 ParamD.SetIdentifier(FTI.ArgInfo[i].Ident, FTI.ArgInfo[i].IdentLoc); 6935 FTI.ArgInfo[i].Param = ActOnParamDeclarator(S, ParamD); 6936 } 6937 } 6938 } 6939} 6940 6941Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, 6942 Declarator &D) { 6943 assert(getCurFunctionDecl() == 0 && "Function parsing confused"); 6944 assert(D.isFunctionDeclarator() && "Not a function declarator!"); 6945 Scope *ParentScope = FnBodyScope->getParent(); 6946 6947 D.setFunctionDefinitionKind(FDK_Definition); 6948 Decl *DP = HandleDeclarator(ParentScope, D, 6949 MultiTemplateParamsArg(*this)); 6950 return ActOnStartOfFunctionDef(FnBodyScope, DP); 6951} 6952 6953static bool ShouldWarnAboutMissingPrototype(const FunctionDecl *FD) { 6954 // Don't warn about invalid declarations. 6955 if (FD->isInvalidDecl()) 6956 return false; 6957 6958 // Or declarations that aren't global. 6959 if (!FD->isGlobal()) 6960 return false; 6961 6962 // Don't warn about C++ member functions. 6963 if (isa<CXXMethodDecl>(FD)) 6964 return false; 6965 6966 // Don't warn about 'main'. 6967 if (FD->isMain()) 6968 return false; 6969 6970 // Don't warn about inline functions. 6971 if (FD->isInlined()) 6972 return false; 6973 6974 // Don't warn about function templates. 6975 if (FD->getDescribedFunctionTemplate()) 6976 return false; 6977 6978 // Don't warn about function template specializations. 6979 if (FD->isFunctionTemplateSpecialization()) 6980 return false; 6981 6982 bool MissingPrototype = true; 6983 for (const FunctionDecl *Prev = FD->getPreviousDecl(); 6984 Prev; Prev = Prev->getPreviousDecl()) { 6985 // Ignore any declarations that occur in function or method 6986 // scope, because they aren't visible from the header. 6987 if (Prev->getDeclContext()->isFunctionOrMethod()) 6988 continue; 6989 6990 MissingPrototype = !Prev->getType()->isFunctionProtoType(); 6991 break; 6992 } 6993 6994 return MissingPrototype; 6995} 6996 6997void Sema::CheckForFunctionRedefinition(FunctionDecl *FD) { 6998 // Don't complain if we're in GNU89 mode and the previous definition 6999 // was an extern inline function. 7000 const FunctionDecl *Definition; 7001 if (FD->isDefined(Definition) && 7002 !canRedefineFunction(Definition, getLangOptions())) { 7003 if (getLangOptions().GNUMode && Definition->isInlineSpecified() && 7004 Definition->getStorageClass() == SC_Extern) 7005 Diag(FD->getLocation(), diag::err_redefinition_extern_inline) 7006 << FD->getDeclName() << getLangOptions().CPlusPlus; 7007 else 7008 Diag(FD->getLocation(), diag::err_redefinition) << FD->getDeclName(); 7009 Diag(Definition->getLocation(), diag::note_previous_definition); 7010 } 7011} 7012 7013Decl *Sema::ActOnStartOfFunctionDef(Scope *FnBodyScope, Decl *D) { 7014 // Clear the last template instantiation error context. 7015 LastTemplateInstantiationErrorContext = ActiveTemplateInstantiation(); 7016 7017 if (!D) 7018 return D; 7019 FunctionDecl *FD = 0; 7020 7021 if (FunctionTemplateDecl *FunTmpl = dyn_cast<FunctionTemplateDecl>(D)) 7022 FD = FunTmpl->getTemplatedDecl(); 7023 else 7024 FD = cast<FunctionDecl>(D); 7025 7026 // Enter a new function scope 7027 PushFunctionScope(); 7028 7029 // See if this is a redefinition. 7030 if (!FD->isLateTemplateParsed()) 7031 CheckForFunctionRedefinition(FD); 7032 7033 // Builtin functions cannot be defined. 7034 if (unsigned BuiltinID = FD->getBuiltinID()) { 7035 if (!Context.BuiltinInfo.isPredefinedLibFunction(BuiltinID)) { 7036 Diag(FD->getLocation(), diag::err_builtin_definition) << FD; 7037 FD->setInvalidDecl(); 7038 } 7039 } 7040 7041 // The return type of a function definition must be complete 7042 // (C99 6.9.1p3, C++ [dcl.fct]p6). 7043 QualType ResultType = FD->getResultType(); 7044 if (!ResultType->isDependentType() && !ResultType->isVoidType() && 7045 !FD->isInvalidDecl() && 7046 RequireCompleteType(FD->getLocation(), ResultType, 7047 diag::err_func_def_incomplete_result)) 7048 FD->setInvalidDecl(); 7049 7050 // GNU warning -Wmissing-prototypes: 7051 // Warn if a global function is defined without a previous 7052 // prototype declaration. This warning is issued even if the 7053 // definition itself provides a prototype. The aim is to detect 7054 // global functions that fail to be declared in header files. 7055 if (ShouldWarnAboutMissingPrototype(FD)) 7056 Diag(FD->getLocation(), diag::warn_missing_prototype) << FD; 7057 7058 if (FnBodyScope) 7059 PushDeclContext(FnBodyScope, FD); 7060 7061 // Check the validity of our function parameters 7062 CheckParmsForFunctionDef(FD->param_begin(), FD->param_end(), 7063 /*CheckParameterNames=*/true); 7064 7065 // Introduce our parameters into the function scope 7066 for (unsigned p = 0, NumParams = FD->getNumParams(); p < NumParams; ++p) { 7067 ParmVarDecl *Param = FD->getParamDecl(p); 7068 Param->setOwningFunction(FD); 7069 7070 // If this has an identifier, add it to the scope stack. 7071 if (Param->getIdentifier() && FnBodyScope) { 7072 CheckShadow(FnBodyScope, Param); 7073 7074 PushOnScopeChains(Param, FnBodyScope); 7075 } 7076 } 7077 7078 // Checking attributes of current function definition 7079 // dllimport attribute. 7080 DLLImportAttr *DA = FD->getAttr<DLLImportAttr>(); 7081 if (DA && (!FD->getAttr<DLLExportAttr>())) { 7082 // dllimport attribute cannot be directly applied to definition. 7083 // Microsoft accepts dllimport for functions defined within class scope. 7084 if (!DA->isInherited() && 7085 !(LangOpts.MicrosoftExt && FD->getLexicalDeclContext()->isRecord())) { 7086 Diag(FD->getLocation(), 7087 diag::err_attribute_can_be_applied_only_to_symbol_declaration) 7088 << "dllimport"; 7089 FD->setInvalidDecl(); 7090 return FD; 7091 } 7092 7093 // Visual C++ appears to not think this is an issue, so only issue 7094 // a warning when Microsoft extensions are disabled. 7095 if (!LangOpts.MicrosoftExt) { 7096 // If a symbol previously declared dllimport is later defined, the 7097 // attribute is ignored in subsequent references, and a warning is 7098 // emitted. 7099 Diag(FD->getLocation(), 7100 diag::warn_redeclaration_without_attribute_prev_attribute_ignored) 7101 << FD->getName() << "dllimport"; 7102 } 7103 } 7104 return FD; 7105} 7106 7107/// \brief Given the set of return statements within a function body, 7108/// compute the variables that are subject to the named return value 7109/// optimization. 7110/// 7111/// Each of the variables that is subject to the named return value 7112/// optimization will be marked as NRVO variables in the AST, and any 7113/// return statement that has a marked NRVO variable as its NRVO candidate can 7114/// use the named return value optimization. 7115/// 7116/// This function applies a very simplistic algorithm for NRVO: if every return 7117/// statement in the function has the same NRVO candidate, that candidate is 7118/// the NRVO variable. 7119/// 7120/// FIXME: Employ a smarter algorithm that accounts for multiple return 7121/// statements and the lifetimes of the NRVO candidates. We should be able to 7122/// find a maximal set of NRVO variables. 7123void Sema::computeNRVO(Stmt *Body, FunctionScopeInfo *Scope) { 7124 ReturnStmt **Returns = Scope->Returns.data(); 7125 7126 const VarDecl *NRVOCandidate = 0; 7127 for (unsigned I = 0, E = Scope->Returns.size(); I != E; ++I) { 7128 if (!Returns[I]->getNRVOCandidate()) 7129 return; 7130 7131 if (!NRVOCandidate) 7132 NRVOCandidate = Returns[I]->getNRVOCandidate(); 7133 else if (NRVOCandidate != Returns[I]->getNRVOCandidate()) 7134 return; 7135 } 7136 7137 if (NRVOCandidate) 7138 const_cast<VarDecl*>(NRVOCandidate)->setNRVOVariable(true); 7139} 7140 7141Decl *Sema::ActOnFinishFunctionBody(Decl *D, Stmt *BodyArg) { 7142 return ActOnFinishFunctionBody(D, move(BodyArg), false); 7143} 7144 7145Decl *Sema::ActOnFinishFunctionBody(Decl *dcl, Stmt *Body, 7146 bool IsInstantiation) { 7147 FunctionDecl *FD = 0; 7148 FunctionTemplateDecl *FunTmpl = dyn_cast_or_null<FunctionTemplateDecl>(dcl); 7149 if (FunTmpl) 7150 FD = FunTmpl->getTemplatedDecl(); 7151 else 7152 FD = dyn_cast_or_null<FunctionDecl>(dcl); 7153 7154 sema::AnalysisBasedWarnings::Policy WP = AnalysisWarnings.getDefaultPolicy(); 7155 sema::AnalysisBasedWarnings::Policy *ActivePolicy = 0; 7156 7157 if (FD) { 7158 FD->setBody(Body); 7159 if (FD->isMain()) { 7160 // C and C++ allow for main to automagically return 0. 7161 // Implements C++ [basic.start.main]p5 and C99 5.1.2.2.3. 7162 FD->setHasImplicitReturnZero(true); 7163 WP.disableCheckFallThrough(); 7164 } else if (FD->hasAttr<NakedAttr>()) { 7165 // If the function is marked 'naked', don't complain about missing return 7166 // statements. 7167 WP.disableCheckFallThrough(); 7168 } 7169 7170 // MSVC permits the use of pure specifier (=0) on function definition, 7171 // defined at class scope, warn about this non standard construct. 7172 if (getLangOptions().MicrosoftExt && FD->isPure()) 7173 Diag(FD->getLocation(), diag::warn_pure_function_definition); 7174 7175 if (!FD->isInvalidDecl()) { 7176 DiagnoseUnusedParameters(FD->param_begin(), FD->param_end()); 7177 DiagnoseSizeOfParametersAndReturnValue(FD->param_begin(), FD->param_end(), 7178 FD->getResultType(), FD); 7179 7180 // If this is a constructor, we need a vtable. 7181 if (CXXConstructorDecl *Constructor = dyn_cast<CXXConstructorDecl>(FD)) 7182 MarkVTableUsed(FD->getLocation(), Constructor->getParent()); 7183 7184 computeNRVO(Body, getCurFunction()); 7185 } 7186 7187 assert(FD == getCurFunctionDecl() && "Function parsing confused"); 7188 } else if (ObjCMethodDecl *MD = dyn_cast_or_null<ObjCMethodDecl>(dcl)) { 7189 assert(MD == getCurMethodDecl() && "Method parsing confused"); 7190 MD->setBody(Body); 7191 if (Body) 7192 MD->setEndLoc(Body->getLocEnd()); 7193 if (!MD->isInvalidDecl()) { 7194 DiagnoseUnusedParameters(MD->param_begin(), MD->param_end()); 7195 DiagnoseSizeOfParametersAndReturnValue(MD->param_begin(), MD->param_end(), 7196 MD->getResultType(), MD); 7197 7198 if (Body) 7199 computeNRVO(Body, getCurFunction()); 7200 } 7201 if (ObjCShouldCallSuperDealloc) { 7202 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_dealloc); 7203 ObjCShouldCallSuperDealloc = false; 7204 } 7205 if (ObjCShouldCallSuperFinalize) { 7206 Diag(MD->getLocEnd(), diag::warn_objc_missing_super_finalize); 7207 ObjCShouldCallSuperFinalize = false; 7208 } 7209 } else { 7210 return 0; 7211 } 7212 7213 assert(!ObjCShouldCallSuperDealloc && "This should only be set for " 7214 "ObjC methods, which should have been handled in the block above."); 7215 assert(!ObjCShouldCallSuperFinalize && "This should only be set for " 7216 "ObjC methods, which should have been handled in the block above."); 7217 7218 // Verify and clean out per-function state. 7219 if (Body) { 7220 // C++ constructors that have function-try-blocks can't have return 7221 // statements in the handlers of that block. (C++ [except.handle]p14) 7222 // Verify this. 7223 if (FD && isa<CXXConstructorDecl>(FD) && isa<CXXTryStmt>(Body)) 7224 DiagnoseReturnInConstructorExceptionHandler(cast<CXXTryStmt>(Body)); 7225 7226 // Verify that gotos and switch cases don't jump into scopes illegally. 7227 if (getCurFunction()->NeedsScopeChecking() && 7228 !dcl->isInvalidDecl() && 7229 !hasAnyUnrecoverableErrorsInThisFunction()) 7230 DiagnoseInvalidJumps(Body); 7231 7232 if (CXXDestructorDecl *Destructor = dyn_cast<CXXDestructorDecl>(dcl)) { 7233 if (!Destructor->getParent()->isDependentType()) 7234 CheckDestructor(Destructor); 7235 7236 MarkBaseAndMemberDestructorsReferenced(Destructor->getLocation(), 7237 Destructor->getParent()); 7238 } 7239 7240 // If any errors have occurred, clear out any temporaries that may have 7241 // been leftover. This ensures that these temporaries won't be picked up for 7242 // deletion in some later function. 7243 if (PP.getDiagnostics().hasErrorOccurred() || 7244 PP.getDiagnostics().getSuppressAllDiagnostics()) { 7245 DiscardCleanupsInEvaluationContext(); 7246 } else if (!isa<FunctionTemplateDecl>(dcl)) { 7247 // Since the body is valid, issue any analysis-based warnings that are 7248 // enabled. 7249 ActivePolicy = &WP; 7250 } 7251 7252 if (FD && FD->isConstexpr() && !FD->isInvalidDecl() && 7253 !CheckConstexprFunctionBody(FD, Body)) 7254 FD->setInvalidDecl(); 7255 7256 assert(ExprCleanupObjects.empty() && "Leftover temporaries in function"); 7257 assert(!ExprNeedsCleanups && "Unaccounted cleanups in function"); 7258 } 7259 7260 if (!IsInstantiation) 7261 PopDeclContext(); 7262 7263 PopFunctionScopeInfo(ActivePolicy, dcl); 7264 7265 // If any errors have occurred, clear out any temporaries that may have 7266 // been leftover. This ensures that these temporaries won't be picked up for 7267 // deletion in some later function. 7268 if (getDiagnostics().hasErrorOccurred()) { 7269 DiscardCleanupsInEvaluationContext(); 7270 } 7271 7272 return dcl; 7273} 7274 7275 7276/// When we finish delayed parsing of an attribute, we must attach it to the 7277/// relevant Decl. 7278void Sema::ActOnFinishDelayedAttribute(Scope *S, Decl *D, 7279 ParsedAttributes &Attrs) { 7280 ProcessDeclAttributeList(S, D, Attrs.getList()); 7281} 7282 7283 7284/// ImplicitlyDefineFunction - An undeclared identifier was used in a function 7285/// call, forming a call to an implicitly defined function (per C99 6.5.1p2). 7286NamedDecl *Sema::ImplicitlyDefineFunction(SourceLocation Loc, 7287 IdentifierInfo &II, Scope *S) { 7288 // Before we produce a declaration for an implicitly defined 7289 // function, see whether there was a locally-scoped declaration of 7290 // this name as a function or variable. If so, use that 7291 // (non-visible) declaration, and complain about it. 7292 llvm::DenseMap<DeclarationName, NamedDecl *>::iterator Pos 7293 = findLocallyScopedExternalDecl(&II); 7294 if (Pos != LocallyScopedExternalDecls.end()) { 7295 Diag(Loc, diag::warn_use_out_of_scope_declaration) << Pos->second; 7296 Diag(Pos->second->getLocation(), diag::note_previous_declaration); 7297 return Pos->second; 7298 } 7299 7300 // Extension in C99. Legal in C90, but warn about it. 7301 unsigned diag_id; 7302 if (II.getName().startswith("__builtin_")) 7303 diag_id = diag::warn_builtin_unknown; 7304 else if (getLangOptions().C99) 7305 diag_id = diag::ext_implicit_function_decl; 7306 else 7307 diag_id = diag::warn_implicit_function_decl; 7308 Diag(Loc, diag_id) << &II; 7309 7310 // Because typo correction is expensive, only do it if the implicit 7311 // function declaration is going to be treated as an error. 7312 if (Diags.getDiagnosticLevel(diag_id, Loc) >= DiagnosticsEngine::Error) { 7313 TypoCorrection Corrected; 7314 if (S && (Corrected = CorrectTypo(DeclarationNameInfo(&II, Loc), 7315 LookupOrdinaryName, S, 0))) { 7316 NamedDecl *Decl = Corrected.getCorrectionDecl(); 7317 if (FunctionDecl *Func = dyn_cast_or_null<FunctionDecl>(Decl)) { 7318 std::string CorrectedStr = Corrected.getAsString(getLangOptions()); 7319 std::string CorrectedQuotedStr = Corrected.getQuoted(getLangOptions()); 7320 7321 Diag(Loc, diag::note_function_suggestion) << CorrectedQuotedStr 7322 << FixItHint::CreateReplacement(Loc, CorrectedStr); 7323 7324 if (Func->getLocation().isValid() 7325 && !II.getName().startswith("__builtin_")) 7326 Diag(Func->getLocation(), diag::note_previous_decl) 7327 << CorrectedQuotedStr; 7328 } 7329 } 7330 } 7331 7332 // Set a Declarator for the implicit definition: int foo(); 7333 const char *Dummy; 7334 AttributeFactory attrFactory; 7335 DeclSpec DS(attrFactory); 7336 unsigned DiagID; 7337 bool Error = DS.SetTypeSpecType(DeclSpec::TST_int, Loc, Dummy, DiagID); 7338 (void)Error; // Silence warning. 7339 assert(!Error && "Error setting up implicit decl!"); 7340 Declarator D(DS, Declarator::BlockContext); 7341 D.AddTypeInfo(DeclaratorChunk::getFunction(false, false, SourceLocation(), 0, 7342 0, 0, true, SourceLocation(), 7343 SourceLocation(), SourceLocation(), 7344 SourceLocation(), 7345 EST_None, SourceLocation(), 7346 0, 0, 0, 0, Loc, Loc, D), 7347 DS.getAttributes(), 7348 SourceLocation()); 7349 D.SetIdentifier(&II, Loc); 7350 7351 // Insert this function into translation-unit scope. 7352 7353 DeclContext *PrevDC = CurContext; 7354 CurContext = Context.getTranslationUnitDecl(); 7355 7356 FunctionDecl *FD = dyn_cast<FunctionDecl>(ActOnDeclarator(TUScope, D)); 7357 FD->setImplicit(); 7358 7359 CurContext = PrevDC; 7360 7361 AddKnownFunctionAttributes(FD); 7362 7363 return FD; 7364} 7365 7366/// \brief Adds any function attributes that we know a priori based on 7367/// the declaration of this function. 7368/// 7369/// These attributes can apply both to implicitly-declared builtins 7370/// (like __builtin___printf_chk) or to library-declared functions 7371/// like NSLog or printf. 7372/// 7373/// We need to check for duplicate attributes both here and where user-written 7374/// attributes are applied to declarations. 7375void Sema::AddKnownFunctionAttributes(FunctionDecl *FD) { 7376 if (FD->isInvalidDecl()) 7377 return; 7378 7379 // If this is a built-in function, map its builtin attributes to 7380 // actual attributes. 7381 if (unsigned BuiltinID = FD->getBuiltinID()) { 7382 // Handle printf-formatting attributes. 7383 unsigned FormatIdx; 7384 bool HasVAListArg; 7385 if (Context.BuiltinInfo.isPrintfLike(BuiltinID, FormatIdx, HasVAListArg)) { 7386 if (!FD->getAttr<FormatAttr>()) 7387 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7388 "printf", FormatIdx+1, 7389 HasVAListArg ? 0 : FormatIdx+2)); 7390 } 7391 if (Context.BuiltinInfo.isScanfLike(BuiltinID, FormatIdx, 7392 HasVAListArg)) { 7393 if (!FD->getAttr<FormatAttr>()) 7394 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7395 "scanf", FormatIdx+1, 7396 HasVAListArg ? 0 : FormatIdx+2)); 7397 } 7398 7399 // Mark const if we don't care about errno and that is the only 7400 // thing preventing the function from being const. This allows 7401 // IRgen to use LLVM intrinsics for such functions. 7402 if (!getLangOptions().MathErrno && 7403 Context.BuiltinInfo.isConstWithoutErrno(BuiltinID)) { 7404 if (!FD->getAttr<ConstAttr>()) 7405 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 7406 } 7407 7408 if (Context.BuiltinInfo.isReturnsTwice(BuiltinID) && 7409 !FD->getAttr<ReturnsTwiceAttr>()) 7410 FD->addAttr(::new (Context) ReturnsTwiceAttr(FD->getLocation(), Context)); 7411 if (Context.BuiltinInfo.isNoThrow(BuiltinID) && !FD->getAttr<NoThrowAttr>()) 7412 FD->addAttr(::new (Context) NoThrowAttr(FD->getLocation(), Context)); 7413 if (Context.BuiltinInfo.isConst(BuiltinID) && !FD->getAttr<ConstAttr>()) 7414 FD->addAttr(::new (Context) ConstAttr(FD->getLocation(), Context)); 7415 } 7416 7417 IdentifierInfo *Name = FD->getIdentifier(); 7418 if (!Name) 7419 return; 7420 if ((!getLangOptions().CPlusPlus && 7421 FD->getDeclContext()->isTranslationUnit()) || 7422 (isa<LinkageSpecDecl>(FD->getDeclContext()) && 7423 cast<LinkageSpecDecl>(FD->getDeclContext())->getLanguage() == 7424 LinkageSpecDecl::lang_c)) { 7425 // Okay: this could be a libc/libm/Objective-C function we know 7426 // about. 7427 } else 7428 return; 7429 7430 if (Name->isStr("NSLog") || Name->isStr("NSLogv")) { 7431 // FIXME: NSLog and NSLogv should be target specific 7432 if (const FormatAttr *Format = FD->getAttr<FormatAttr>()) { 7433 // FIXME: We known better than our headers. 7434 const_cast<FormatAttr *>(Format)->setType(Context, "printf"); 7435 } else 7436 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7437 "printf", 1, 7438 Name->isStr("NSLogv") ? 0 : 2)); 7439 } else if (Name->isStr("asprintf") || Name->isStr("vasprintf")) { 7440 // FIXME: asprintf and vasprintf aren't C99 functions. Should they be 7441 // target-specific builtins, perhaps? 7442 if (!FD->getAttr<FormatAttr>()) 7443 FD->addAttr(::new (Context) FormatAttr(FD->getLocation(), Context, 7444 "printf", 2, 7445 Name->isStr("vasprintf") ? 0 : 3)); 7446 } 7447} 7448 7449TypedefDecl *Sema::ParseTypedefDecl(Scope *S, Declarator &D, QualType T, 7450 TypeSourceInfo *TInfo) { 7451 assert(D.getIdentifier() && "Wrong callback for declspec without declarator"); 7452 assert(!T.isNull() && "GetTypeForDeclarator() returned null type"); 7453 7454 if (!TInfo) { 7455 assert(D.isInvalidType() && "no declarator info for valid type"); 7456 TInfo = Context.getTrivialTypeSourceInfo(T); 7457 } 7458 7459 // Scope manipulation handled by caller. 7460 TypedefDecl *NewTD = TypedefDecl::Create(Context, CurContext, 7461 D.getSourceRange().getBegin(), 7462 D.getIdentifierLoc(), 7463 D.getIdentifier(), 7464 TInfo); 7465 7466 // Bail out immediately if we have an invalid declaration. 7467 if (D.isInvalidType()) { 7468 NewTD->setInvalidDecl(); 7469 return NewTD; 7470 } 7471 7472 if (D.getDeclSpec().isModulePrivateSpecified()) { 7473 if (CurContext->isFunctionOrMethod()) 7474 Diag(NewTD->getLocation(), diag::err_module_private_local) 7475 << 2 << NewTD->getDeclName() 7476 << SourceRange(D.getDeclSpec().getModulePrivateSpecLoc()) 7477 << FixItHint::CreateRemoval(D.getDeclSpec().getModulePrivateSpecLoc()); 7478 else 7479 NewTD->setModulePrivate(); 7480 } 7481 7482 // C++ [dcl.typedef]p8: 7483 // If the typedef declaration defines an unnamed class (or 7484 // enum), the first typedef-name declared by the declaration 7485 // to be that class type (or enum type) is used to denote the 7486 // class type (or enum type) for linkage purposes only. 7487 // We need to check whether the type was declared in the declaration. 7488 switch (D.getDeclSpec().getTypeSpecType()) { 7489 case TST_enum: 7490 case TST_struct: 7491 case TST_union: 7492 case TST_class: { 7493 TagDecl *tagFromDeclSpec = cast<TagDecl>(D.getDeclSpec().getRepAsDecl()); 7494 7495 // Do nothing if the tag is not anonymous or already has an 7496 // associated typedef (from an earlier typedef in this decl group). 7497 if (tagFromDeclSpec->getIdentifier()) break; 7498 if (tagFromDeclSpec->getTypedefNameForAnonDecl()) break; 7499 7500 // A well-formed anonymous tag must always be a TUK_Definition. 7501 assert(tagFromDeclSpec->isThisDeclarationADefinition()); 7502 7503 // The type must match the tag exactly; no qualifiers allowed. 7504 if (!Context.hasSameType(T, Context.getTagDeclType(tagFromDeclSpec))) 7505 break; 7506 7507 // Otherwise, set this is the anon-decl typedef for the tag. 7508 tagFromDeclSpec->setTypedefNameForAnonDecl(NewTD); 7509 break; 7510 } 7511 7512 default: 7513 break; 7514 } 7515 7516 return NewTD; 7517} 7518 7519 7520/// \brief Determine whether a tag with a given kind is acceptable 7521/// as a redeclaration of the given tag declaration. 7522/// 7523/// \returns true if the new tag kind is acceptable, false otherwise. 7524bool Sema::isAcceptableTagRedeclaration(const TagDecl *Previous, 7525 TagTypeKind NewTag, bool isDefinition, 7526 SourceLocation NewTagLoc, 7527 const IdentifierInfo &Name) { 7528 // C++ [dcl.type.elab]p3: 7529 // The class-key or enum keyword present in the 7530 // elaborated-type-specifier shall agree in kind with the 7531 // declaration to which the name in the elaborated-type-specifier 7532 // refers. This rule also applies to the form of 7533 // elaborated-type-specifier that declares a class-name or 7534 // friend class since it can be construed as referring to the 7535 // definition of the class. Thus, in any 7536 // elaborated-type-specifier, the enum keyword shall be used to 7537 // refer to an enumeration (7.2), the union class-key shall be 7538 // used to refer to a union (clause 9), and either the class or 7539 // struct class-key shall be used to refer to a class (clause 9) 7540 // declared using the class or struct class-key. 7541 TagTypeKind OldTag = Previous->getTagKind(); 7542 if (!isDefinition || (NewTag != TTK_Class && NewTag != TTK_Struct)) 7543 if (OldTag == NewTag) 7544 return true; 7545 7546 if ((OldTag == TTK_Struct || OldTag == TTK_Class) && 7547 (NewTag == TTK_Struct || NewTag == TTK_Class)) { 7548 // Warn about the struct/class tag mismatch. 7549 bool isTemplate = false; 7550 if (const CXXRecordDecl *Record = dyn_cast<CXXRecordDecl>(Previous)) 7551 isTemplate = Record->getDescribedClassTemplate(); 7552 7553 if (!ActiveTemplateInstantiations.empty()) { 7554 // In a template instantiation, do not offer fix-its for tag mismatches 7555 // since they usually mess up the template instead of fixing the problem. 7556 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 7557 << (NewTag == TTK_Class) << isTemplate << &Name; 7558 return true; 7559 } 7560 7561 if (isDefinition) { 7562 // On definitions, check previous tags and issue a fix-it for each 7563 // one that doesn't match the current tag. 7564 if (Previous->getDefinition()) { 7565 // Don't suggest fix-its for redefinitions. 7566 return true; 7567 } 7568 7569 bool previousMismatch = false; 7570 for (TagDecl::redecl_iterator I(Previous->redecls_begin()), 7571 E(Previous->redecls_end()); I != E; ++I) { 7572 if (I->getTagKind() != NewTag) { 7573 if (!previousMismatch) { 7574 previousMismatch = true; 7575 Diag(NewTagLoc, diag::warn_struct_class_previous_tag_mismatch) 7576 << (NewTag == TTK_Class) << isTemplate << &Name; 7577 } 7578 Diag(I->getInnerLocStart(), diag::note_struct_class_suggestion) 7579 << (NewTag == TTK_Class) 7580 << FixItHint::CreateReplacement(I->getInnerLocStart(), 7581 NewTag == TTK_Class? 7582 "class" : "struct"); 7583 } 7584 } 7585 return true; 7586 } 7587 7588 // Check for a previous definition. If current tag and definition 7589 // are same type, do nothing. If no definition, but disagree with 7590 // with previous tag type, give a warning, but no fix-it. 7591 const TagDecl *Redecl = Previous->getDefinition() ? 7592 Previous->getDefinition() : Previous; 7593 if (Redecl->getTagKind() == NewTag) { 7594 return true; 7595 } 7596 7597 Diag(NewTagLoc, diag::warn_struct_class_tag_mismatch) 7598 << (NewTag == TTK_Class) 7599 << isTemplate << &Name; 7600 Diag(Redecl->getLocation(), diag::note_previous_use); 7601 7602 // If there is a previous defintion, suggest a fix-it. 7603 if (Previous->getDefinition()) { 7604 Diag(NewTagLoc, diag::note_struct_class_suggestion) 7605 << (Redecl->getTagKind() == TTK_Class) 7606 << FixItHint::CreateReplacement(SourceRange(NewTagLoc), 7607 Redecl->getTagKind() == TTK_Class? "class" : "struct"); 7608 } 7609 7610 return true; 7611 } 7612 return false; 7613} 7614 7615/// ActOnTag - This is invoked when we see 'struct foo' or 'struct {'. In the 7616/// former case, Name will be non-null. In the later case, Name will be null. 7617/// TagSpec indicates what kind of tag this is. TUK indicates whether this is a 7618/// reference/declaration/definition of a tag. 7619Decl *Sema::ActOnTag(Scope *S, unsigned TagSpec, TagUseKind TUK, 7620 SourceLocation KWLoc, CXXScopeSpec &SS, 7621 IdentifierInfo *Name, SourceLocation NameLoc, 7622 AttributeList *Attr, AccessSpecifier AS, 7623 SourceLocation ModulePrivateLoc, 7624 MultiTemplateParamsArg TemplateParameterLists, 7625 bool &OwnedDecl, bool &IsDependent, 7626 SourceLocation ScopedEnumKWLoc, 7627 bool ScopedEnumUsesClassTag, 7628 TypeResult UnderlyingType) { 7629 // If this is not a definition, it must have a name. 7630 assert((Name != 0 || TUK == TUK_Definition) && 7631 "Nameless record must be a definition!"); 7632 assert(TemplateParameterLists.size() == 0 || TUK != TUK_Reference); 7633 7634 OwnedDecl = false; 7635 TagTypeKind Kind = TypeWithKeyword::getTagTypeKindForTypeSpec(TagSpec); 7636 bool ScopedEnum = ScopedEnumKWLoc.isValid(); 7637 7638 // FIXME: Check explicit specializations more carefully. 7639 bool isExplicitSpecialization = false; 7640 bool Invalid = false; 7641 7642 // We only need to do this matching if we have template parameters 7643 // or a scope specifier, which also conveniently avoids this work 7644 // for non-C++ cases. 7645 if (TemplateParameterLists.size() > 0 || 7646 (SS.isNotEmpty() && TUK != TUK_Reference)) { 7647 if (TemplateParameterList *TemplateParams 7648 = MatchTemplateParametersToScopeSpecifier(KWLoc, NameLoc, SS, 7649 TemplateParameterLists.get(), 7650 TemplateParameterLists.size(), 7651 TUK == TUK_Friend, 7652 isExplicitSpecialization, 7653 Invalid)) { 7654 if (TemplateParams->size() > 0) { 7655 // This is a declaration or definition of a class template (which may 7656 // be a member of another template). 7657 7658 if (Invalid) 7659 return 0; 7660 7661 OwnedDecl = false; 7662 DeclResult Result = CheckClassTemplate(S, TagSpec, TUK, KWLoc, 7663 SS, Name, NameLoc, Attr, 7664 TemplateParams, AS, 7665 ModulePrivateLoc, 7666 TemplateParameterLists.size() - 1, 7667 (TemplateParameterList**) TemplateParameterLists.release()); 7668 return Result.get(); 7669 } else { 7670 // The "template<>" header is extraneous. 7671 Diag(TemplateParams->getTemplateLoc(), diag::err_template_tag_noparams) 7672 << TypeWithKeyword::getTagTypeKindName(Kind) << Name; 7673 isExplicitSpecialization = true; 7674 } 7675 } 7676 } 7677 7678 // Figure out the underlying type if this a enum declaration. We need to do 7679 // this early, because it's needed to detect if this is an incompatible 7680 // redeclaration. 7681 llvm::PointerUnion<const Type*, TypeSourceInfo*> EnumUnderlying; 7682 7683 if (Kind == TTK_Enum) { 7684 if (UnderlyingType.isInvalid() || (!UnderlyingType.get() && ScopedEnum)) 7685 // No underlying type explicitly specified, or we failed to parse the 7686 // type, default to int. 7687 EnumUnderlying = Context.IntTy.getTypePtr(); 7688 else if (UnderlyingType.get()) { 7689 // C++0x 7.2p2: The type-specifier-seq of an enum-base shall name an 7690 // integral type; any cv-qualification is ignored. 7691 TypeSourceInfo *TI = 0; 7692 QualType T = GetTypeFromParser(UnderlyingType.get(), &TI); 7693 EnumUnderlying = TI; 7694 7695 SourceLocation UnderlyingLoc = TI->getTypeLoc().getBeginLoc(); 7696 7697 if (!T->isDependentType() && !T->isIntegralType(Context)) { 7698 Diag(UnderlyingLoc, diag::err_enum_invalid_underlying) 7699 << T; 7700 // Recover by falling back to int. 7701 EnumUnderlying = Context.IntTy.getTypePtr(); 7702 } 7703 7704 if (DiagnoseUnexpandedParameterPack(UnderlyingLoc, TI, 7705 UPPC_FixedUnderlyingType)) 7706 EnumUnderlying = Context.IntTy.getTypePtr(); 7707 7708 } else if (getLangOptions().MicrosoftExt) 7709 // Microsoft enums are always of int type. 7710 EnumUnderlying = Context.IntTy.getTypePtr(); 7711 } 7712 7713 DeclContext *SearchDC = CurContext; 7714 DeclContext *DC = CurContext; 7715 bool isStdBadAlloc = false; 7716 7717 RedeclarationKind Redecl = ForRedeclaration; 7718 if (TUK == TUK_Friend || TUK == TUK_Reference) 7719 Redecl = NotForRedeclaration; 7720 7721 LookupResult Previous(*this, Name, NameLoc, LookupTagName, Redecl); 7722 7723 if (Name && SS.isNotEmpty()) { 7724 // We have a nested-name tag ('struct foo::bar'). 7725 7726 // Check for invalid 'foo::'. 7727 if (SS.isInvalid()) { 7728 Name = 0; 7729 goto CreateNewDecl; 7730 } 7731 7732 // If this is a friend or a reference to a class in a dependent 7733 // context, don't try to make a decl for it. 7734 if (TUK == TUK_Friend || TUK == TUK_Reference) { 7735 DC = computeDeclContext(SS, false); 7736 if (!DC) { 7737 IsDependent = true; 7738 return 0; 7739 } 7740 } else { 7741 DC = computeDeclContext(SS, true); 7742 if (!DC) { 7743 Diag(SS.getRange().getBegin(), diag::err_dependent_nested_name_spec) 7744 << SS.getRange(); 7745 return 0; 7746 } 7747 } 7748 7749 if (RequireCompleteDeclContext(SS, DC)) 7750 return 0; 7751 7752 SearchDC = DC; 7753 // Look-up name inside 'foo::'. 7754 LookupQualifiedName(Previous, DC); 7755 7756 if (Previous.isAmbiguous()) 7757 return 0; 7758 7759 if (Previous.empty()) { 7760 // Name lookup did not find anything. However, if the 7761 // nested-name-specifier refers to the current instantiation, 7762 // and that current instantiation has any dependent base 7763 // classes, we might find something at instantiation time: treat 7764 // this as a dependent elaborated-type-specifier. 7765 // But this only makes any sense for reference-like lookups. 7766 if (Previous.wasNotFoundInCurrentInstantiation() && 7767 (TUK == TUK_Reference || TUK == TUK_Friend)) { 7768 IsDependent = true; 7769 return 0; 7770 } 7771 7772 // A tag 'foo::bar' must already exist. 7773 Diag(NameLoc, diag::err_not_tag_in_scope) 7774 << Kind << Name << DC << SS.getRange(); 7775 Name = 0; 7776 Invalid = true; 7777 goto CreateNewDecl; 7778 } 7779 } else if (Name) { 7780 // If this is a named struct, check to see if there was a previous forward 7781 // declaration or definition. 7782 // FIXME: We're looking into outer scopes here, even when we 7783 // shouldn't be. Doing so can result in ambiguities that we 7784 // shouldn't be diagnosing. 7785 LookupName(Previous, S); 7786 7787 if (Previous.isAmbiguous() && 7788 (TUK == TUK_Definition || TUK == TUK_Declaration)) { 7789 LookupResult::Filter F = Previous.makeFilter(); 7790 while (F.hasNext()) { 7791 NamedDecl *ND = F.next(); 7792 if (ND->getDeclContext()->getRedeclContext() != SearchDC) 7793 F.erase(); 7794 } 7795 F.done(); 7796 } 7797 7798 // Note: there used to be some attempt at recovery here. 7799 if (Previous.isAmbiguous()) 7800 return 0; 7801 7802 if (!getLangOptions().CPlusPlus && TUK != TUK_Reference) { 7803 // FIXME: This makes sure that we ignore the contexts associated 7804 // with C structs, unions, and enums when looking for a matching 7805 // tag declaration or definition. See the similar lookup tweak 7806 // in Sema::LookupName; is there a better way to deal with this? 7807 while (isa<RecordDecl>(SearchDC) || isa<EnumDecl>(SearchDC)) 7808 SearchDC = SearchDC->getParent(); 7809 } 7810 } else if (S->isFunctionPrototypeScope()) { 7811 // If this is an enum declaration in function prototype scope, set its 7812 // initial context to the translation unit. 7813 SearchDC = Context.getTranslationUnitDecl(); 7814 } 7815 7816 if (Previous.isSingleResult() && 7817 Previous.getFoundDecl()->isTemplateParameter()) { 7818 // Maybe we will complain about the shadowed template parameter. 7819 DiagnoseTemplateParameterShadow(NameLoc, Previous.getFoundDecl()); 7820 // Just pretend that we didn't see the previous declaration. 7821 Previous.clear(); 7822 } 7823 7824 if (getLangOptions().CPlusPlus && Name && DC && StdNamespace && 7825 DC->Equals(getStdNamespace()) && Name->isStr("bad_alloc")) { 7826 // This is a declaration of or a reference to "std::bad_alloc". 7827 isStdBadAlloc = true; 7828 7829 if (Previous.empty() && StdBadAlloc) { 7830 // std::bad_alloc has been implicitly declared (but made invisible to 7831 // name lookup). Fill in this implicit declaration as the previous 7832 // declaration, so that the declarations get chained appropriately. 7833 Previous.addDecl(getStdBadAlloc()); 7834 } 7835 } 7836 7837 // If we didn't find a previous declaration, and this is a reference 7838 // (or friend reference), move to the correct scope. In C++, we 7839 // also need to do a redeclaration lookup there, just in case 7840 // there's a shadow friend decl. 7841 if (Name && Previous.empty() && 7842 (TUK == TUK_Reference || TUK == TUK_Friend)) { 7843 if (Invalid) goto CreateNewDecl; 7844 assert(SS.isEmpty()); 7845 7846 if (TUK == TUK_Reference) { 7847 // C++ [basic.scope.pdecl]p5: 7848 // -- for an elaborated-type-specifier of the form 7849 // 7850 // class-key identifier 7851 // 7852 // if the elaborated-type-specifier is used in the 7853 // decl-specifier-seq or parameter-declaration-clause of a 7854 // function defined in namespace scope, the identifier is 7855 // declared as a class-name in the namespace that contains 7856 // the declaration; otherwise, except as a friend 7857 // declaration, the identifier is declared in the smallest 7858 // non-class, non-function-prototype scope that contains the 7859 // declaration. 7860 // 7861 // C99 6.7.2.3p8 has a similar (but not identical!) provision for 7862 // C structs and unions. 7863 // 7864 // It is an error in C++ to declare (rather than define) an enum 7865 // type, including via an elaborated type specifier. We'll 7866 // diagnose that later; for now, declare the enum in the same 7867 // scope as we would have picked for any other tag type. 7868 // 7869 // GNU C also supports this behavior as part of its incomplete 7870 // enum types extension, while GNU C++ does not. 7871 // 7872 // Find the context where we'll be declaring the tag. 7873 // FIXME: We would like to maintain the current DeclContext as the 7874 // lexical context, 7875 while (SearchDC->isRecord() || SearchDC->isTransparentContext() || 7876 SearchDC->isObjCContainer()) 7877 SearchDC = SearchDC->getParent(); 7878 7879 // Find the scope where we'll be declaring the tag. 7880 while (S->isClassScope() || 7881 (getLangOptions().CPlusPlus && 7882 S->isFunctionPrototypeScope()) || 7883 ((S->getFlags() & Scope::DeclScope) == 0) || 7884 (S->getEntity() && 7885 ((DeclContext *)S->getEntity())->isTransparentContext())) 7886 S = S->getParent(); 7887 } else { 7888 assert(TUK == TUK_Friend); 7889 // C++ [namespace.memdef]p3: 7890 // If a friend declaration in a non-local class first declares a 7891 // class or function, the friend class or function is a member of 7892 // the innermost enclosing namespace. 7893 SearchDC = SearchDC->getEnclosingNamespaceContext(); 7894 } 7895 7896 // In C++, we need to do a redeclaration lookup to properly 7897 // diagnose some problems. 7898 if (getLangOptions().CPlusPlus) { 7899 Previous.setRedeclarationKind(ForRedeclaration); 7900 LookupQualifiedName(Previous, SearchDC); 7901 } 7902 } 7903 7904 if (!Previous.empty()) { 7905 NamedDecl *PrevDecl = (*Previous.begin())->getUnderlyingDecl(); 7906 7907 // It's okay to have a tag decl in the same scope as a typedef 7908 // which hides a tag decl in the same scope. Finding this 7909 // insanity with a redeclaration lookup can only actually happen 7910 // in C++. 7911 // 7912 // This is also okay for elaborated-type-specifiers, which is 7913 // technically forbidden by the current standard but which is 7914 // okay according to the likely resolution of an open issue; 7915 // see http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#407 7916 if (getLangOptions().CPlusPlus) { 7917 if (TypedefNameDecl *TD = dyn_cast<TypedefNameDecl>(PrevDecl)) { 7918 if (const TagType *TT = TD->getUnderlyingType()->getAs<TagType>()) { 7919 TagDecl *Tag = TT->getDecl(); 7920 if (Tag->getDeclName() == Name && 7921 Tag->getDeclContext()->getRedeclContext() 7922 ->Equals(TD->getDeclContext()->getRedeclContext())) { 7923 PrevDecl = Tag; 7924 Previous.clear(); 7925 Previous.addDecl(Tag); 7926 Previous.resolveKind(); 7927 } 7928 } 7929 } 7930 } 7931 7932 if (TagDecl *PrevTagDecl = dyn_cast<TagDecl>(PrevDecl)) { 7933 // If this is a use of a previous tag, or if the tag is already declared 7934 // in the same scope (so that the definition/declaration completes or 7935 // rementions the tag), reuse the decl. 7936 if (TUK == TUK_Reference || TUK == TUK_Friend || 7937 isDeclInScope(PrevDecl, SearchDC, S, isExplicitSpecialization)) { 7938 // Make sure that this wasn't declared as an enum and now used as a 7939 // struct or something similar. 7940 if (!isAcceptableTagRedeclaration(PrevTagDecl, Kind, 7941 TUK == TUK_Definition, KWLoc, 7942 *Name)) { 7943 bool SafeToContinue 7944 = (PrevTagDecl->getTagKind() != TTK_Enum && 7945 Kind != TTK_Enum); 7946 if (SafeToContinue) 7947 Diag(KWLoc, diag::err_use_with_wrong_tag) 7948 << Name 7949 << FixItHint::CreateReplacement(SourceRange(KWLoc), 7950 PrevTagDecl->getKindName()); 7951 else 7952 Diag(KWLoc, diag::err_use_with_wrong_tag) << Name; 7953 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7954 7955 if (SafeToContinue) 7956 Kind = PrevTagDecl->getTagKind(); 7957 else { 7958 // Recover by making this an anonymous redefinition. 7959 Name = 0; 7960 Previous.clear(); 7961 Invalid = true; 7962 } 7963 } 7964 7965 if (Kind == TTK_Enum && PrevTagDecl->getTagKind() == TTK_Enum) { 7966 const EnumDecl *PrevEnum = cast<EnumDecl>(PrevTagDecl); 7967 7968 // If this is an elaborated-type-specifier for a scoped enumeration, 7969 // the 'class' keyword is not necessary and not permitted. 7970 if (TUK == TUK_Reference || TUK == TUK_Friend) { 7971 if (ScopedEnum) 7972 Diag(ScopedEnumKWLoc, diag::err_enum_class_reference) 7973 << PrevEnum->isScoped() 7974 << FixItHint::CreateRemoval(ScopedEnumKWLoc); 7975 return PrevTagDecl; 7976 } 7977 7978 // All conflicts with previous declarations are recovered by 7979 // returning the previous declaration. 7980 if (ScopedEnum != PrevEnum->isScoped()) { 7981 Diag(KWLoc, diag::err_enum_redeclare_scoped_mismatch) 7982 << PrevEnum->isScoped(); 7983 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 7984 return PrevTagDecl; 7985 } 7986 else if (EnumUnderlying && PrevEnum->isFixed()) { 7987 QualType T; 7988 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 7989 T = TI->getType(); 7990 else 7991 T = QualType(EnumUnderlying.get<const Type*>(), 0); 7992 7993 if (!Context.hasSameUnqualifiedType(T, 7994 PrevEnum->getIntegerType())) { 7995 Diag(NameLoc.isValid() ? NameLoc : KWLoc, 7996 diag::err_enum_redeclare_type_mismatch) 7997 << T 7998 << PrevEnum->getIntegerType(); 7999 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 8000 return PrevTagDecl; 8001 } 8002 } 8003 else if (!EnumUnderlying.isNull() != PrevEnum->isFixed()) { 8004 Diag(KWLoc, diag::err_enum_redeclare_fixed_mismatch) 8005 << PrevEnum->isFixed(); 8006 Diag(PrevTagDecl->getLocation(), diag::note_previous_use); 8007 return PrevTagDecl; 8008 } 8009 } 8010 8011 if (!Invalid) { 8012 // If this is a use, just return the declaration we found. 8013 8014 // FIXME: In the future, return a variant or some other clue 8015 // for the consumer of this Decl to know it doesn't own it. 8016 // For our current ASTs this shouldn't be a problem, but will 8017 // need to be changed with DeclGroups. 8018 if ((TUK == TUK_Reference && (!PrevTagDecl->getFriendObjectKind() || 8019 getLangOptions().MicrosoftExt)) || TUK == TUK_Friend) 8020 return PrevTagDecl; 8021 8022 // Diagnose attempts to redefine a tag. 8023 if (TUK == TUK_Definition) { 8024 if (TagDecl *Def = PrevTagDecl->getDefinition()) { 8025 // If we're defining a specialization and the previous definition 8026 // is from an implicit instantiation, don't emit an error 8027 // here; we'll catch this in the general case below. 8028 if (!isExplicitSpecialization || 8029 !isa<CXXRecordDecl>(Def) || 8030 cast<CXXRecordDecl>(Def)->getTemplateSpecializationKind() 8031 == TSK_ExplicitSpecialization) { 8032 Diag(NameLoc, diag::err_redefinition) << Name; 8033 Diag(Def->getLocation(), diag::note_previous_definition); 8034 // If this is a redefinition, recover by making this 8035 // struct be anonymous, which will make any later 8036 // references get the previous definition. 8037 Name = 0; 8038 Previous.clear(); 8039 Invalid = true; 8040 } 8041 } else { 8042 // If the type is currently being defined, complain 8043 // about a nested redefinition. 8044 const TagType *Tag 8045 = cast<TagType>(Context.getTagDeclType(PrevTagDecl)); 8046 if (Tag->isBeingDefined()) { 8047 Diag(NameLoc, diag::err_nested_redefinition) << Name; 8048 Diag(PrevTagDecl->getLocation(), 8049 diag::note_previous_definition); 8050 Name = 0; 8051 Previous.clear(); 8052 Invalid = true; 8053 } 8054 } 8055 8056 // Okay, this is definition of a previously declared or referenced 8057 // tag PrevDecl. We're going to create a new Decl for it. 8058 } 8059 } 8060 // If we get here we have (another) forward declaration or we 8061 // have a definition. Just create a new decl. 8062 8063 } else { 8064 // If we get here, this is a definition of a new tag type in a nested 8065 // scope, e.g. "struct foo; void bar() { struct foo; }", just create a 8066 // new decl/type. We set PrevDecl to NULL so that the entities 8067 // have distinct types. 8068 Previous.clear(); 8069 } 8070 // If we get here, we're going to create a new Decl. If PrevDecl 8071 // is non-NULL, it's a definition of the tag declared by 8072 // PrevDecl. If it's NULL, we have a new definition. 8073 8074 8075 // Otherwise, PrevDecl is not a tag, but was found with tag 8076 // lookup. This is only actually possible in C++, where a few 8077 // things like templates still live in the tag namespace. 8078 } else { 8079 // Use a better diagnostic if an elaborated-type-specifier 8080 // found the wrong kind of type on the first 8081 // (non-redeclaration) lookup. 8082 if ((TUK == TUK_Reference || TUK == TUK_Friend) && 8083 !Previous.isForRedeclaration()) { 8084 unsigned Kind = 0; 8085 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 8086 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 8087 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 8088 Diag(NameLoc, diag::err_tag_reference_non_tag) << Kind; 8089 Diag(PrevDecl->getLocation(), diag::note_declared_at); 8090 Invalid = true; 8091 8092 // Otherwise, only diagnose if the declaration is in scope. 8093 } else if (!isDeclInScope(PrevDecl, SearchDC, S, 8094 isExplicitSpecialization)) { 8095 // do nothing 8096 8097 // Diagnose implicit declarations introduced by elaborated types. 8098 } else if (TUK == TUK_Reference || TUK == TUK_Friend) { 8099 unsigned Kind = 0; 8100 if (isa<TypedefDecl>(PrevDecl)) Kind = 1; 8101 else if (isa<TypeAliasDecl>(PrevDecl)) Kind = 2; 8102 else if (isa<ClassTemplateDecl>(PrevDecl)) Kind = 3; 8103 Diag(NameLoc, diag::err_tag_reference_conflict) << Kind; 8104 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 8105 Invalid = true; 8106 8107 // Otherwise it's a declaration. Call out a particularly common 8108 // case here. 8109 } else if (TypedefNameDecl *TND = dyn_cast<TypedefNameDecl>(PrevDecl)) { 8110 unsigned Kind = 0; 8111 if (isa<TypeAliasDecl>(PrevDecl)) Kind = 1; 8112 Diag(NameLoc, diag::err_tag_definition_of_typedef) 8113 << Name << Kind << TND->getUnderlyingType(); 8114 Diag(PrevDecl->getLocation(), diag::note_previous_decl) << PrevDecl; 8115 Invalid = true; 8116 8117 // Otherwise, diagnose. 8118 } else { 8119 // The tag name clashes with something else in the target scope, 8120 // issue an error and recover by making this tag be anonymous. 8121 Diag(NameLoc, diag::err_redefinition_different_kind) << Name; 8122 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 8123 Name = 0; 8124 Invalid = true; 8125 } 8126 8127 // The existing declaration isn't relevant to us; we're in a 8128 // new scope, so clear out the previous declaration. 8129 Previous.clear(); 8130 } 8131 } 8132 8133CreateNewDecl: 8134 8135 TagDecl *PrevDecl = 0; 8136 if (Previous.isSingleResult()) 8137 PrevDecl = cast<TagDecl>(Previous.getFoundDecl()); 8138 8139 // If there is an identifier, use the location of the identifier as the 8140 // location of the decl, otherwise use the location of the struct/union 8141 // keyword. 8142 SourceLocation Loc = NameLoc.isValid() ? NameLoc : KWLoc; 8143 8144 // Otherwise, create a new declaration. If there is a previous 8145 // declaration of the same entity, the two will be linked via 8146 // PrevDecl. 8147 TagDecl *New; 8148 8149 bool IsForwardReference = false; 8150 if (Kind == TTK_Enum) { 8151 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 8152 // enum X { A, B, C } D; D should chain to X. 8153 New = EnumDecl::Create(Context, SearchDC, KWLoc, Loc, Name, 8154 cast_or_null<EnumDecl>(PrevDecl), ScopedEnum, 8155 ScopedEnumUsesClassTag, !EnumUnderlying.isNull()); 8156 // If this is an undefined enum, warn. 8157 if (TUK != TUK_Definition && !Invalid) { 8158 TagDecl *Def; 8159 if (getLangOptions().CPlusPlus0x && cast<EnumDecl>(New)->isFixed()) { 8160 // C++0x: 7.2p2: opaque-enum-declaration. 8161 // Conflicts are diagnosed above. Do nothing. 8162 } 8163 else if (PrevDecl && (Def = cast<EnumDecl>(PrevDecl)->getDefinition())) { 8164 Diag(Loc, diag::ext_forward_ref_enum_def) 8165 << New; 8166 Diag(Def->getLocation(), diag::note_previous_definition); 8167 } else { 8168 unsigned DiagID = diag::ext_forward_ref_enum; 8169 if (getLangOptions().MicrosoftExt) 8170 DiagID = diag::ext_ms_forward_ref_enum; 8171 else if (getLangOptions().CPlusPlus) 8172 DiagID = diag::err_forward_ref_enum; 8173 Diag(Loc, DiagID); 8174 8175 // If this is a forward-declared reference to an enumeration, make a 8176 // note of it; we won't actually be introducing the declaration into 8177 // the declaration context. 8178 if (TUK == TUK_Reference) 8179 IsForwardReference = true; 8180 } 8181 } 8182 8183 if (EnumUnderlying) { 8184 EnumDecl *ED = cast<EnumDecl>(New); 8185 if (TypeSourceInfo *TI = EnumUnderlying.dyn_cast<TypeSourceInfo*>()) 8186 ED->setIntegerTypeSourceInfo(TI); 8187 else 8188 ED->setIntegerType(QualType(EnumUnderlying.get<const Type*>(), 0)); 8189 ED->setPromotionType(ED->getIntegerType()); 8190 } 8191 8192 } else { 8193 // struct/union/class 8194 8195 // FIXME: Tag decls should be chained to any simultaneous vardecls, e.g.: 8196 // struct X { int A; } D; D should chain to X. 8197 if (getLangOptions().CPlusPlus) { 8198 // FIXME: Look for a way to use RecordDecl for simple structs. 8199 New = CXXRecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 8200 cast_or_null<CXXRecordDecl>(PrevDecl)); 8201 8202 if (isStdBadAlloc && (!StdBadAlloc || getStdBadAlloc()->isImplicit())) 8203 StdBadAlloc = cast<CXXRecordDecl>(New); 8204 } else 8205 New = RecordDecl::Create(Context, Kind, SearchDC, KWLoc, Loc, Name, 8206 cast_or_null<RecordDecl>(PrevDecl)); 8207 } 8208 8209 // Maybe add qualifier info. 8210 if (SS.isNotEmpty()) { 8211 if (SS.isSet()) { 8212 New->setQualifierInfo(SS.getWithLocInContext(Context)); 8213 if (TemplateParameterLists.size() > 0) { 8214 New->setTemplateParameterListsInfo(Context, 8215 TemplateParameterLists.size(), 8216 (TemplateParameterList**) TemplateParameterLists.release()); 8217 } 8218 } 8219 else 8220 Invalid = true; 8221 } 8222 8223 if (RecordDecl *RD = dyn_cast<RecordDecl>(New)) { 8224 // Add alignment attributes if necessary; these attributes are checked when 8225 // the ASTContext lays out the structure. 8226 // 8227 // It is important for implementing the correct semantics that this 8228 // happen here (in act on tag decl). The #pragma pack stack is 8229 // maintained as a result of parser callbacks which can occur at 8230 // many points during the parsing of a struct declaration (because 8231 // the #pragma tokens are effectively skipped over during the 8232 // parsing of the struct). 8233 AddAlignmentAttributesForRecord(RD); 8234 8235 AddMsStructLayoutForRecord(RD); 8236 } 8237 8238 if (ModulePrivateLoc.isValid()) { 8239 if (isExplicitSpecialization) 8240 Diag(New->getLocation(), diag::err_module_private_specialization) 8241 << 2 8242 << FixItHint::CreateRemoval(ModulePrivateLoc); 8243 // __module_private__ does not apply to local classes. However, we only 8244 // diagnose this as an error when the declaration specifiers are 8245 // freestanding. Here, we just ignore the __module_private__. 8246 else if (!SearchDC->isFunctionOrMethod()) 8247 New->setModulePrivate(); 8248 } 8249 8250 // If this is a specialization of a member class (of a class template), 8251 // check the specialization. 8252 if (isExplicitSpecialization && CheckMemberSpecialization(New, Previous)) 8253 Invalid = true; 8254 8255 if (Invalid) 8256 New->setInvalidDecl(); 8257 8258 if (Attr) 8259 ProcessDeclAttributeList(S, New, Attr); 8260 8261 // If we're declaring or defining a tag in function prototype scope 8262 // in C, note that this type can only be used within the function. 8263 if (Name && S->isFunctionPrototypeScope() && !getLangOptions().CPlusPlus) 8264 Diag(Loc, diag::warn_decl_in_param_list) << Context.getTagDeclType(New); 8265 8266 // Set the lexical context. If the tag has a C++ scope specifier, the 8267 // lexical context will be different from the semantic context. 8268 New->setLexicalDeclContext(CurContext); 8269 8270 // Mark this as a friend decl if applicable. 8271 // In Microsoft mode, a friend declaration also acts as a forward 8272 // declaration so we always pass true to setObjectOfFriendDecl to make 8273 // the tag name visible. 8274 if (TUK == TUK_Friend) 8275 New->setObjectOfFriendDecl(/* PreviouslyDeclared = */ !Previous.empty() || 8276 getLangOptions().MicrosoftExt); 8277 8278 // Set the access specifier. 8279 if (!Invalid && SearchDC->isRecord()) 8280 SetMemberAccessSpecifier(New, PrevDecl, AS); 8281 8282 if (TUK == TUK_Definition) 8283 New->startDefinition(); 8284 8285 // If this has an identifier, add it to the scope stack. 8286 if (TUK == TUK_Friend) { 8287 // We might be replacing an existing declaration in the lookup tables; 8288 // if so, borrow its access specifier. 8289 if (PrevDecl) 8290 New->setAccess(PrevDecl->getAccess()); 8291 8292 DeclContext *DC = New->getDeclContext()->getRedeclContext(); 8293 DC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 8294 if (Name) // can be null along some error paths 8295 if (Scope *EnclosingScope = getScopeForDeclContext(S, DC)) 8296 PushOnScopeChains(New, EnclosingScope, /* AddToContext = */ false); 8297 } else if (Name) { 8298 S = getNonFieldDeclScope(S); 8299 PushOnScopeChains(New, S, !IsForwardReference); 8300 if (IsForwardReference) 8301 SearchDC->makeDeclVisibleInContext(New, /* Recoverable = */ false); 8302 8303 } else { 8304 CurContext->addDecl(New); 8305 } 8306 8307 // If this is the C FILE type, notify the AST context. 8308 if (IdentifierInfo *II = New->getIdentifier()) 8309 if (!New->isInvalidDecl() && 8310 New->getDeclContext()->getRedeclContext()->isTranslationUnit() && 8311 II->isStr("FILE")) 8312 Context.setFILEDecl(New); 8313 8314 OwnedDecl = true; 8315 return New; 8316} 8317 8318void Sema::ActOnTagStartDefinition(Scope *S, Decl *TagD) { 8319 AdjustDeclIfTemplate(TagD); 8320 TagDecl *Tag = cast<TagDecl>(TagD); 8321 8322 // Enter the tag context. 8323 PushDeclContext(S, Tag); 8324} 8325 8326Decl *Sema::ActOnObjCContainerStartDefinition(Decl *IDecl) { 8327 assert(isa<ObjCContainerDecl>(IDecl) && 8328 "ActOnObjCContainerStartDefinition - Not ObjCContainerDecl"); 8329 DeclContext *OCD = cast<DeclContext>(IDecl); 8330 assert(getContainingDC(OCD) == CurContext && 8331 "The next DeclContext should be lexically contained in the current one."); 8332 CurContext = OCD; 8333 return IDecl; 8334} 8335 8336void Sema::ActOnStartCXXMemberDeclarations(Scope *S, Decl *TagD, 8337 SourceLocation FinalLoc, 8338 SourceLocation LBraceLoc) { 8339 AdjustDeclIfTemplate(TagD); 8340 CXXRecordDecl *Record = cast<CXXRecordDecl>(TagD); 8341 8342 FieldCollector->StartClass(); 8343 8344 if (!Record->getIdentifier()) 8345 return; 8346 8347 if (FinalLoc.isValid()) 8348 Record->addAttr(new (Context) FinalAttr(FinalLoc, Context)); 8349 8350 // C++ [class]p2: 8351 // [...] The class-name is also inserted into the scope of the 8352 // class itself; this is known as the injected-class-name. For 8353 // purposes of access checking, the injected-class-name is treated 8354 // as if it were a public member name. 8355 CXXRecordDecl *InjectedClassName 8356 = CXXRecordDecl::Create(Context, Record->getTagKind(), CurContext, 8357 Record->getLocStart(), Record->getLocation(), 8358 Record->getIdentifier(), 8359 /*PrevDecl=*/0, 8360 /*DelayTypeCreation=*/true); 8361 Context.getTypeDeclType(InjectedClassName, Record); 8362 InjectedClassName->setImplicit(); 8363 InjectedClassName->setAccess(AS_public); 8364 if (ClassTemplateDecl *Template = Record->getDescribedClassTemplate()) 8365 InjectedClassName->setDescribedClassTemplate(Template); 8366 PushOnScopeChains(InjectedClassName, S); 8367 assert(InjectedClassName->isInjectedClassName() && 8368 "Broken injected-class-name"); 8369} 8370 8371void Sema::ActOnTagFinishDefinition(Scope *S, Decl *TagD, 8372 SourceLocation RBraceLoc) { 8373 AdjustDeclIfTemplate(TagD); 8374 TagDecl *Tag = cast<TagDecl>(TagD); 8375 Tag->setRBraceLoc(RBraceLoc); 8376 8377 if (isa<CXXRecordDecl>(Tag)) 8378 FieldCollector->FinishClass(); 8379 8380 // Exit this scope of this tag's definition. 8381 PopDeclContext(); 8382 8383 // Notify the consumer that we've defined a tag. 8384 Consumer.HandleTagDeclDefinition(Tag); 8385} 8386 8387void Sema::ActOnObjCContainerFinishDefinition() { 8388 // Exit this scope of this interface definition. 8389 PopDeclContext(); 8390} 8391 8392void Sema::ActOnObjCTemporaryExitContainerContext(DeclContext *DC) { 8393 assert(DC == CurContext && "Mismatch of container contexts"); 8394 OriginalLexicalContext = DC; 8395 ActOnObjCContainerFinishDefinition(); 8396} 8397 8398void Sema::ActOnObjCReenterContainerContext(DeclContext *DC) { 8399 ActOnObjCContainerStartDefinition(cast<Decl>(DC)); 8400 OriginalLexicalContext = 0; 8401} 8402 8403void Sema::ActOnTagDefinitionError(Scope *S, Decl *TagD) { 8404 AdjustDeclIfTemplate(TagD); 8405 TagDecl *Tag = cast<TagDecl>(TagD); 8406 Tag->setInvalidDecl(); 8407 8408 // We're undoing ActOnTagStartDefinition here, not 8409 // ActOnStartCXXMemberDeclarations, so we don't have to mess with 8410 // the FieldCollector. 8411 8412 PopDeclContext(); 8413} 8414 8415// Note that FieldName may be null for anonymous bitfields. 8416bool Sema::VerifyBitField(SourceLocation FieldLoc, IdentifierInfo *FieldName, 8417 QualType FieldTy, const Expr *BitWidth, 8418 bool *ZeroWidth) { 8419 // Default to true; that shouldn't confuse checks for emptiness 8420 if (ZeroWidth) 8421 *ZeroWidth = true; 8422 8423 // C99 6.7.2.1p4 - verify the field type. 8424 // C++ 9.6p3: A bit-field shall have integral or enumeration type. 8425 if (!FieldTy->isDependentType() && !FieldTy->isIntegralOrEnumerationType()) { 8426 // Handle incomplete types with specific error. 8427 if (RequireCompleteType(FieldLoc, FieldTy, diag::err_field_incomplete)) 8428 return true; 8429 if (FieldName) 8430 return Diag(FieldLoc, diag::err_not_integral_type_bitfield) 8431 << FieldName << FieldTy << BitWidth->getSourceRange(); 8432 return Diag(FieldLoc, diag::err_not_integral_type_anon_bitfield) 8433 << FieldTy << BitWidth->getSourceRange(); 8434 } else if (DiagnoseUnexpandedParameterPack(const_cast<Expr *>(BitWidth), 8435 UPPC_BitFieldWidth)) 8436 return true; 8437 8438 // If the bit-width is type- or value-dependent, don't try to check 8439 // it now. 8440 if (BitWidth->isValueDependent() || BitWidth->isTypeDependent()) 8441 return false; 8442 8443 llvm::APSInt Value; 8444 if (VerifyIntegerConstantExpression(BitWidth, &Value)) 8445 return true; 8446 8447 if (Value != 0 && ZeroWidth) 8448 *ZeroWidth = false; 8449 8450 // Zero-width bitfield is ok for anonymous field. 8451 if (Value == 0 && FieldName) 8452 return Diag(FieldLoc, diag::err_bitfield_has_zero_width) << FieldName; 8453 8454 if (Value.isSigned() && Value.isNegative()) { 8455 if (FieldName) 8456 return Diag(FieldLoc, diag::err_bitfield_has_negative_width) 8457 << FieldName << Value.toString(10); 8458 return Diag(FieldLoc, diag::err_anon_bitfield_has_negative_width) 8459 << Value.toString(10); 8460 } 8461 8462 if (!FieldTy->isDependentType()) { 8463 uint64_t TypeSize = Context.getTypeSize(FieldTy); 8464 if (Value.getZExtValue() > TypeSize) { 8465 if (!getLangOptions().CPlusPlus) { 8466 if (FieldName) 8467 return Diag(FieldLoc, diag::err_bitfield_width_exceeds_type_size) 8468 << FieldName << (unsigned)Value.getZExtValue() 8469 << (unsigned)TypeSize; 8470 8471 return Diag(FieldLoc, diag::err_anon_bitfield_width_exceeds_type_size) 8472 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 8473 } 8474 8475 if (FieldName) 8476 Diag(FieldLoc, diag::warn_bitfield_width_exceeds_type_size) 8477 << FieldName << (unsigned)Value.getZExtValue() 8478 << (unsigned)TypeSize; 8479 else 8480 Diag(FieldLoc, diag::warn_anon_bitfield_width_exceeds_type_size) 8481 << (unsigned)Value.getZExtValue() << (unsigned)TypeSize; 8482 } 8483 } 8484 8485 return false; 8486} 8487 8488/// ActOnField - Each field of a C struct/union is passed into this in order 8489/// to create a FieldDecl object for it. 8490Decl *Sema::ActOnField(Scope *S, Decl *TagD, SourceLocation DeclStart, 8491 Declarator &D, Expr *BitfieldWidth) { 8492 FieldDecl *Res = HandleField(S, cast_or_null<RecordDecl>(TagD), 8493 DeclStart, D, static_cast<Expr*>(BitfieldWidth), 8494 /*HasInit=*/false, AS_public); 8495 return Res; 8496} 8497 8498/// HandleField - Analyze a field of a C struct or a C++ data member. 8499/// 8500FieldDecl *Sema::HandleField(Scope *S, RecordDecl *Record, 8501 SourceLocation DeclStart, 8502 Declarator &D, Expr *BitWidth, bool HasInit, 8503 AccessSpecifier AS) { 8504 IdentifierInfo *II = D.getIdentifier(); 8505 SourceLocation Loc = DeclStart; 8506 if (II) Loc = D.getIdentifierLoc(); 8507 8508 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8509 QualType T = TInfo->getType(); 8510 if (getLangOptions().CPlusPlus) { 8511 CheckExtraCXXDefaultArguments(D); 8512 8513 if (DiagnoseUnexpandedParameterPack(D.getIdentifierLoc(), TInfo, 8514 UPPC_DataMemberType)) { 8515 D.setInvalidType(); 8516 T = Context.IntTy; 8517 TInfo = Context.getTrivialTypeSourceInfo(T, Loc); 8518 } 8519 } 8520 8521 DiagnoseFunctionSpecifiers(D); 8522 8523 if (D.getDeclSpec().isThreadSpecified()) 8524 Diag(D.getDeclSpec().getThreadSpecLoc(), diag::err_invalid_thread); 8525 if (D.getDeclSpec().isConstexprSpecified()) 8526 Diag(D.getDeclSpec().getConstexprSpecLoc(), diag::err_invalid_constexpr) 8527 << 2; 8528 8529 // Check to see if this name was declared as a member previously 8530 NamedDecl *PrevDecl = 0; 8531 LookupResult Previous(*this, II, Loc, LookupMemberName, ForRedeclaration); 8532 LookupName(Previous, S); 8533 switch (Previous.getResultKind()) { 8534 case LookupResult::Found: 8535 case LookupResult::FoundUnresolvedValue: 8536 PrevDecl = Previous.getAsSingle<NamedDecl>(); 8537 break; 8538 8539 case LookupResult::FoundOverloaded: 8540 PrevDecl = Previous.getRepresentativeDecl(); 8541 break; 8542 8543 case LookupResult::NotFound: 8544 case LookupResult::NotFoundInCurrentInstantiation: 8545 case LookupResult::Ambiguous: 8546 break; 8547 } 8548 Previous.suppressDiagnostics(); 8549 8550 if (PrevDecl && PrevDecl->isTemplateParameter()) { 8551 // Maybe we will complain about the shadowed template parameter. 8552 DiagnoseTemplateParameterShadow(D.getIdentifierLoc(), PrevDecl); 8553 // Just pretend that we didn't see the previous declaration. 8554 PrevDecl = 0; 8555 } 8556 8557 if (PrevDecl && !isDeclInScope(PrevDecl, Record, S)) 8558 PrevDecl = 0; 8559 8560 bool Mutable 8561 = (D.getDeclSpec().getStorageClassSpec() == DeclSpec::SCS_mutable); 8562 SourceLocation TSSL = D.getSourceRange().getBegin(); 8563 FieldDecl *NewFD 8564 = CheckFieldDecl(II, T, TInfo, Record, Loc, Mutable, BitWidth, HasInit, 8565 TSSL, AS, PrevDecl, &D); 8566 8567 if (NewFD->isInvalidDecl()) 8568 Record->setInvalidDecl(); 8569 8570 if (D.getDeclSpec().isModulePrivateSpecified()) 8571 NewFD->setModulePrivate(); 8572 8573 if (NewFD->isInvalidDecl() && PrevDecl) { 8574 // Don't introduce NewFD into scope; there's already something 8575 // with the same name in the same scope. 8576 } else if (II) { 8577 PushOnScopeChains(NewFD, S); 8578 } else 8579 Record->addDecl(NewFD); 8580 8581 return NewFD; 8582} 8583 8584/// \brief Build a new FieldDecl and check its well-formedness. 8585/// 8586/// This routine builds a new FieldDecl given the fields name, type, 8587/// record, etc. \p PrevDecl should refer to any previous declaration 8588/// with the same name and in the same scope as the field to be 8589/// created. 8590/// 8591/// \returns a new FieldDecl. 8592/// 8593/// \todo The Declarator argument is a hack. It will be removed once 8594FieldDecl *Sema::CheckFieldDecl(DeclarationName Name, QualType T, 8595 TypeSourceInfo *TInfo, 8596 RecordDecl *Record, SourceLocation Loc, 8597 bool Mutable, Expr *BitWidth, bool HasInit, 8598 SourceLocation TSSL, 8599 AccessSpecifier AS, NamedDecl *PrevDecl, 8600 Declarator *D) { 8601 IdentifierInfo *II = Name.getAsIdentifierInfo(); 8602 bool InvalidDecl = false; 8603 if (D) InvalidDecl = D->isInvalidType(); 8604 8605 // If we receive a broken type, recover by assuming 'int' and 8606 // marking this declaration as invalid. 8607 if (T.isNull()) { 8608 InvalidDecl = true; 8609 T = Context.IntTy; 8610 } 8611 8612 QualType EltTy = Context.getBaseElementType(T); 8613 if (!EltTy->isDependentType() && 8614 RequireCompleteType(Loc, EltTy, diag::err_field_incomplete)) { 8615 // Fields of incomplete type force their record to be invalid. 8616 Record->setInvalidDecl(); 8617 InvalidDecl = true; 8618 } 8619 8620 // C99 6.7.2.1p8: A member of a structure or union may have any type other 8621 // than a variably modified type. 8622 if (!InvalidDecl && T->isVariablyModifiedType()) { 8623 bool SizeIsNegative; 8624 llvm::APSInt Oversized; 8625 QualType FixedTy = TryToFixInvalidVariablyModifiedType(T, Context, 8626 SizeIsNegative, 8627 Oversized); 8628 if (!FixedTy.isNull()) { 8629 Diag(Loc, diag::warn_illegal_constant_array_size); 8630 T = FixedTy; 8631 } else { 8632 if (SizeIsNegative) 8633 Diag(Loc, diag::err_typecheck_negative_array_size); 8634 else if (Oversized.getBoolValue()) 8635 Diag(Loc, diag::err_array_too_large) 8636 << Oversized.toString(10); 8637 else 8638 Diag(Loc, diag::err_typecheck_field_variable_size); 8639 InvalidDecl = true; 8640 } 8641 } 8642 8643 // Fields can not have abstract class types 8644 if (!InvalidDecl && RequireNonAbstractType(Loc, T, 8645 diag::err_abstract_type_in_decl, 8646 AbstractFieldType)) 8647 InvalidDecl = true; 8648 8649 bool ZeroWidth = false; 8650 // If this is declared as a bit-field, check the bit-field. 8651 if (!InvalidDecl && BitWidth && 8652 VerifyBitField(Loc, II, T, BitWidth, &ZeroWidth)) { 8653 InvalidDecl = true; 8654 BitWidth = 0; 8655 ZeroWidth = false; 8656 } 8657 8658 // Check that 'mutable' is consistent with the type of the declaration. 8659 if (!InvalidDecl && Mutable) { 8660 unsigned DiagID = 0; 8661 if (T->isReferenceType()) 8662 DiagID = diag::err_mutable_reference; 8663 else if (T.isConstQualified()) 8664 DiagID = diag::err_mutable_const; 8665 8666 if (DiagID) { 8667 SourceLocation ErrLoc = Loc; 8668 if (D && D->getDeclSpec().getStorageClassSpecLoc().isValid()) 8669 ErrLoc = D->getDeclSpec().getStorageClassSpecLoc(); 8670 Diag(ErrLoc, DiagID); 8671 Mutable = false; 8672 InvalidDecl = true; 8673 } 8674 } 8675 8676 FieldDecl *NewFD = FieldDecl::Create(Context, Record, TSSL, Loc, II, T, TInfo, 8677 BitWidth, Mutable, HasInit); 8678 if (InvalidDecl) 8679 NewFD->setInvalidDecl(); 8680 8681 if (PrevDecl && !isa<TagDecl>(PrevDecl)) { 8682 Diag(Loc, diag::err_duplicate_member) << II; 8683 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 8684 NewFD->setInvalidDecl(); 8685 } 8686 8687 if (!InvalidDecl && getLangOptions().CPlusPlus) { 8688 if (Record->isUnion()) { 8689 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 8690 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 8691 if (RDecl->getDefinition()) { 8692 // C++ [class.union]p1: An object of a class with a non-trivial 8693 // constructor, a non-trivial copy constructor, a non-trivial 8694 // destructor, or a non-trivial copy assignment operator 8695 // cannot be a member of a union, nor can an array of such 8696 // objects. 8697 if (CheckNontrivialField(NewFD)) 8698 NewFD->setInvalidDecl(); 8699 } 8700 } 8701 8702 // C++ [class.union]p1: If a union contains a member of reference type, 8703 // the program is ill-formed. 8704 if (EltTy->isReferenceType()) { 8705 Diag(NewFD->getLocation(), diag::err_union_member_of_reference_type) 8706 << NewFD->getDeclName() << EltTy; 8707 NewFD->setInvalidDecl(); 8708 } 8709 } 8710 } 8711 8712 // FIXME: We need to pass in the attributes given an AST 8713 // representation, not a parser representation. 8714 if (D) 8715 // FIXME: What to pass instead of TUScope? 8716 ProcessDeclAttributes(TUScope, NewFD, *D); 8717 8718 // In auto-retain/release, infer strong retension for fields of 8719 // retainable type. 8720 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewFD)) 8721 NewFD->setInvalidDecl(); 8722 8723 if (T.isObjCGCWeak()) 8724 Diag(Loc, diag::warn_attribute_weak_on_field); 8725 8726 NewFD->setAccess(AS); 8727 return NewFD; 8728} 8729 8730bool Sema::CheckNontrivialField(FieldDecl *FD) { 8731 assert(FD); 8732 assert(getLangOptions().CPlusPlus && "valid check only for C++"); 8733 8734 if (FD->isInvalidDecl()) 8735 return true; 8736 8737 QualType EltTy = Context.getBaseElementType(FD->getType()); 8738 if (const RecordType *RT = EltTy->getAs<RecordType>()) { 8739 CXXRecordDecl* RDecl = cast<CXXRecordDecl>(RT->getDecl()); 8740 if (RDecl->getDefinition()) { 8741 // We check for copy constructors before constructors 8742 // because otherwise we'll never get complaints about 8743 // copy constructors. 8744 8745 CXXSpecialMember member = CXXInvalid; 8746 if (!RDecl->hasTrivialCopyConstructor()) 8747 member = CXXCopyConstructor; 8748 else if (!RDecl->hasTrivialDefaultConstructor()) 8749 member = CXXDefaultConstructor; 8750 else if (!RDecl->hasTrivialCopyAssignment()) 8751 member = CXXCopyAssignment; 8752 else if (!RDecl->hasTrivialDestructor()) 8753 member = CXXDestructor; 8754 8755 if (member != CXXInvalid) { 8756 if (!getLangOptions().CPlusPlus0x && 8757 getLangOptions().ObjCAutoRefCount && RDecl->hasObjectMember()) { 8758 // Objective-C++ ARC: it is an error to have a non-trivial field of 8759 // a union. However, system headers in Objective-C programs 8760 // occasionally have Objective-C lifetime objects within unions, 8761 // and rather than cause the program to fail, we make those 8762 // members unavailable. 8763 SourceLocation Loc = FD->getLocation(); 8764 if (getSourceManager().isInSystemHeader(Loc)) { 8765 if (!FD->hasAttr<UnavailableAttr>()) 8766 FD->addAttr(new (Context) UnavailableAttr(Loc, Context, 8767 "this system field has retaining ownership")); 8768 return false; 8769 } 8770 } 8771 8772 Diag(FD->getLocation(), getLangOptions().CPlusPlus0x ? 8773 diag::warn_cxx98_compat_nontrivial_union_or_anon_struct_member : 8774 diag::err_illegal_union_or_anon_struct_member) 8775 << (int)FD->getParent()->isUnion() << FD->getDeclName() << member; 8776 DiagnoseNontrivial(RT, member); 8777 return !getLangOptions().CPlusPlus0x; 8778 } 8779 } 8780 } 8781 8782 return false; 8783} 8784 8785/// DiagnoseNontrivial - Given that a class has a non-trivial 8786/// special member, figure out why. 8787void Sema::DiagnoseNontrivial(const RecordType* T, CXXSpecialMember member) { 8788 QualType QT(T, 0U); 8789 CXXRecordDecl* RD = cast<CXXRecordDecl>(T->getDecl()); 8790 8791 // Check whether the member was user-declared. 8792 switch (member) { 8793 case CXXInvalid: 8794 break; 8795 8796 case CXXDefaultConstructor: 8797 if (RD->hasUserDeclaredConstructor()) { 8798 typedef CXXRecordDecl::ctor_iterator ctor_iter; 8799 for (ctor_iter ci = RD->ctor_begin(), ce = RD->ctor_end(); ci != ce;++ci){ 8800 const FunctionDecl *body = 0; 8801 ci->hasBody(body); 8802 if (!body || !cast<CXXConstructorDecl>(body)->isImplicitlyDefined()) { 8803 SourceLocation CtorLoc = ci->getLocation(); 8804 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8805 return; 8806 } 8807 } 8808 8809 llvm_unreachable("found no user-declared constructors"); 8810 } 8811 break; 8812 8813 case CXXCopyConstructor: 8814 if (RD->hasUserDeclaredCopyConstructor()) { 8815 SourceLocation CtorLoc = 8816 RD->getCopyConstructor(0)->getLocation(); 8817 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8818 return; 8819 } 8820 break; 8821 8822 case CXXMoveConstructor: 8823 if (RD->hasUserDeclaredMoveConstructor()) { 8824 SourceLocation CtorLoc = RD->getMoveConstructor()->getLocation(); 8825 Diag(CtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8826 return; 8827 } 8828 break; 8829 8830 case CXXCopyAssignment: 8831 if (RD->hasUserDeclaredCopyAssignment()) { 8832 // FIXME: this should use the location of the copy 8833 // assignment, not the type. 8834 SourceLocation TyLoc = RD->getSourceRange().getBegin(); 8835 Diag(TyLoc, diag::note_nontrivial_user_defined) << QT << member; 8836 return; 8837 } 8838 break; 8839 8840 case CXXMoveAssignment: 8841 if (RD->hasUserDeclaredMoveAssignment()) { 8842 SourceLocation AssignLoc = RD->getMoveAssignmentOperator()->getLocation(); 8843 Diag(AssignLoc, diag::note_nontrivial_user_defined) << QT << member; 8844 return; 8845 } 8846 break; 8847 8848 case CXXDestructor: 8849 if (RD->hasUserDeclaredDestructor()) { 8850 SourceLocation DtorLoc = LookupDestructor(RD)->getLocation(); 8851 Diag(DtorLoc, diag::note_nontrivial_user_defined) << QT << member; 8852 return; 8853 } 8854 break; 8855 } 8856 8857 typedef CXXRecordDecl::base_class_iterator base_iter; 8858 8859 // Virtual bases and members inhibit trivial copying/construction, 8860 // but not trivial destruction. 8861 if (member != CXXDestructor) { 8862 // Check for virtual bases. vbases includes indirect virtual bases, 8863 // so we just iterate through the direct bases. 8864 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) 8865 if (bi->isVirtual()) { 8866 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 8867 Diag(BaseLoc, diag::note_nontrivial_has_virtual) << QT << 1; 8868 return; 8869 } 8870 8871 // Check for virtual methods. 8872 typedef CXXRecordDecl::method_iterator meth_iter; 8873 for (meth_iter mi = RD->method_begin(), me = RD->method_end(); mi != me; 8874 ++mi) { 8875 if (mi->isVirtual()) { 8876 SourceLocation MLoc = mi->getSourceRange().getBegin(); 8877 Diag(MLoc, diag::note_nontrivial_has_virtual) << QT << 0; 8878 return; 8879 } 8880 } 8881 } 8882 8883 bool (CXXRecordDecl::*hasTrivial)() const; 8884 switch (member) { 8885 case CXXDefaultConstructor: 8886 hasTrivial = &CXXRecordDecl::hasTrivialDefaultConstructor; break; 8887 case CXXCopyConstructor: 8888 hasTrivial = &CXXRecordDecl::hasTrivialCopyConstructor; break; 8889 case CXXCopyAssignment: 8890 hasTrivial = &CXXRecordDecl::hasTrivialCopyAssignment; break; 8891 case CXXDestructor: 8892 hasTrivial = &CXXRecordDecl::hasTrivialDestructor; break; 8893 default: 8894 llvm_unreachable("unexpected special member"); 8895 } 8896 8897 // Check for nontrivial bases (and recurse). 8898 for (base_iter bi = RD->bases_begin(), be = RD->bases_end(); bi != be; ++bi) { 8899 const RecordType *BaseRT = bi->getType()->getAs<RecordType>(); 8900 assert(BaseRT && "Don't know how to handle dependent bases"); 8901 CXXRecordDecl *BaseRecTy = cast<CXXRecordDecl>(BaseRT->getDecl()); 8902 if (!(BaseRecTy->*hasTrivial)()) { 8903 SourceLocation BaseLoc = bi->getSourceRange().getBegin(); 8904 Diag(BaseLoc, diag::note_nontrivial_has_nontrivial) << QT << 1 << member; 8905 DiagnoseNontrivial(BaseRT, member); 8906 return; 8907 } 8908 } 8909 8910 // Check for nontrivial members (and recurse). 8911 typedef RecordDecl::field_iterator field_iter; 8912 for (field_iter fi = RD->field_begin(), fe = RD->field_end(); fi != fe; 8913 ++fi) { 8914 QualType EltTy = Context.getBaseElementType((*fi)->getType()); 8915 if (const RecordType *EltRT = EltTy->getAs<RecordType>()) { 8916 CXXRecordDecl* EltRD = cast<CXXRecordDecl>(EltRT->getDecl()); 8917 8918 if (!(EltRD->*hasTrivial)()) { 8919 SourceLocation FLoc = (*fi)->getLocation(); 8920 Diag(FLoc, diag::note_nontrivial_has_nontrivial) << QT << 0 << member; 8921 DiagnoseNontrivial(EltRT, member); 8922 return; 8923 } 8924 } 8925 8926 if (EltTy->isObjCLifetimeType()) { 8927 switch (EltTy.getObjCLifetime()) { 8928 case Qualifiers::OCL_None: 8929 case Qualifiers::OCL_ExplicitNone: 8930 break; 8931 8932 case Qualifiers::OCL_Autoreleasing: 8933 case Qualifiers::OCL_Weak: 8934 case Qualifiers::OCL_Strong: 8935 Diag((*fi)->getLocation(), diag::note_nontrivial_objc_ownership) 8936 << QT << EltTy.getObjCLifetime(); 8937 return; 8938 } 8939 } 8940 } 8941 8942 llvm_unreachable("found no explanation for non-trivial member"); 8943} 8944 8945/// TranslateIvarVisibility - Translate visibility from a token ID to an 8946/// AST enum value. 8947static ObjCIvarDecl::AccessControl 8948TranslateIvarVisibility(tok::ObjCKeywordKind ivarVisibility) { 8949 switch (ivarVisibility) { 8950 default: llvm_unreachable("Unknown visitibility kind"); 8951 case tok::objc_private: return ObjCIvarDecl::Private; 8952 case tok::objc_public: return ObjCIvarDecl::Public; 8953 case tok::objc_protected: return ObjCIvarDecl::Protected; 8954 case tok::objc_package: return ObjCIvarDecl::Package; 8955 } 8956} 8957 8958/// ActOnIvar - Each ivar field of an objective-c class is passed into this 8959/// in order to create an IvarDecl object for it. 8960Decl *Sema::ActOnIvar(Scope *S, 8961 SourceLocation DeclStart, 8962 Declarator &D, Expr *BitfieldWidth, 8963 tok::ObjCKeywordKind Visibility) { 8964 8965 IdentifierInfo *II = D.getIdentifier(); 8966 Expr *BitWidth = (Expr*)BitfieldWidth; 8967 SourceLocation Loc = DeclStart; 8968 if (II) Loc = D.getIdentifierLoc(); 8969 8970 // FIXME: Unnamed fields can be handled in various different ways, for 8971 // example, unnamed unions inject all members into the struct namespace! 8972 8973 TypeSourceInfo *TInfo = GetTypeForDeclarator(D, S); 8974 QualType T = TInfo->getType(); 8975 8976 if (BitWidth) { 8977 // 6.7.2.1p3, 6.7.2.1p4 8978 if (VerifyBitField(Loc, II, T, BitWidth)) { 8979 D.setInvalidType(); 8980 BitWidth = 0; 8981 } 8982 } else { 8983 // Not a bitfield. 8984 8985 // validate II. 8986 8987 } 8988 if (T->isReferenceType()) { 8989 Diag(Loc, diag::err_ivar_reference_type); 8990 D.setInvalidType(); 8991 } 8992 // C99 6.7.2.1p8: A member of a structure or union may have any type other 8993 // than a variably modified type. 8994 else if (T->isVariablyModifiedType()) { 8995 Diag(Loc, diag::err_typecheck_ivar_variable_size); 8996 D.setInvalidType(); 8997 } 8998 8999 // Get the visibility (access control) for this ivar. 9000 ObjCIvarDecl::AccessControl ac = 9001 Visibility != tok::objc_not_keyword ? TranslateIvarVisibility(Visibility) 9002 : ObjCIvarDecl::None; 9003 // Must set ivar's DeclContext to its enclosing interface. 9004 ObjCContainerDecl *EnclosingDecl = cast<ObjCContainerDecl>(CurContext); 9005 ObjCContainerDecl *EnclosingContext; 9006 if (ObjCImplementationDecl *IMPDecl = 9007 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 9008 if (!LangOpts.ObjCNonFragileABI2) { 9009 // Case of ivar declared in an implementation. Context is that of its class. 9010 EnclosingContext = IMPDecl->getClassInterface(); 9011 assert(EnclosingContext && "Implementation has no class interface!"); 9012 } 9013 else 9014 EnclosingContext = EnclosingDecl; 9015 } else { 9016 if (ObjCCategoryDecl *CDecl = 9017 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 9018 if (!LangOpts.ObjCNonFragileABI2 || !CDecl->IsClassExtension()) { 9019 Diag(Loc, diag::err_misplaced_ivar) << CDecl->IsClassExtension(); 9020 return 0; 9021 } 9022 } 9023 EnclosingContext = EnclosingDecl; 9024 } 9025 9026 // Construct the decl. 9027 ObjCIvarDecl *NewID = ObjCIvarDecl::Create(Context, EnclosingContext, 9028 DeclStart, Loc, II, T, 9029 TInfo, ac, (Expr *)BitfieldWidth); 9030 9031 if (II) { 9032 NamedDecl *PrevDecl = LookupSingleName(S, II, Loc, LookupMemberName, 9033 ForRedeclaration); 9034 if (PrevDecl && isDeclInScope(PrevDecl, EnclosingContext, S) 9035 && !isa<TagDecl>(PrevDecl)) { 9036 Diag(Loc, diag::err_duplicate_member) << II; 9037 Diag(PrevDecl->getLocation(), diag::note_previous_declaration); 9038 NewID->setInvalidDecl(); 9039 } 9040 } 9041 9042 // Process attributes attached to the ivar. 9043 ProcessDeclAttributes(S, NewID, D); 9044 9045 if (D.isInvalidType()) 9046 NewID->setInvalidDecl(); 9047 9048 // In ARC, infer 'retaining' for ivars of retainable type. 9049 if (getLangOptions().ObjCAutoRefCount && inferObjCARCLifetime(NewID)) 9050 NewID->setInvalidDecl(); 9051 9052 if (D.getDeclSpec().isModulePrivateSpecified()) 9053 NewID->setModulePrivate(); 9054 9055 if (II) { 9056 // FIXME: When interfaces are DeclContexts, we'll need to add 9057 // these to the interface. 9058 S->AddDecl(NewID); 9059 IdResolver.AddDecl(NewID); 9060 } 9061 9062 return NewID; 9063} 9064 9065/// ActOnLastBitfield - This routine handles synthesized bitfields rules for 9066/// class and class extensions. For every class @interface and class 9067/// extension @interface, if the last ivar is a bitfield of any type, 9068/// then add an implicit `char :0` ivar to the end of that interface. 9069void Sema::ActOnLastBitfield(SourceLocation DeclLoc, 9070 SmallVectorImpl<Decl *> &AllIvarDecls) { 9071 if (!LangOpts.ObjCNonFragileABI2 || AllIvarDecls.empty()) 9072 return; 9073 9074 Decl *ivarDecl = AllIvarDecls[AllIvarDecls.size()-1]; 9075 ObjCIvarDecl *Ivar = cast<ObjCIvarDecl>(ivarDecl); 9076 9077 if (!Ivar->isBitField() || Ivar->getBitWidthValue(Context) == 0) 9078 return; 9079 ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(CurContext); 9080 if (!ID) { 9081 if (ObjCCategoryDecl *CD = dyn_cast<ObjCCategoryDecl>(CurContext)) { 9082 if (!CD->IsClassExtension()) 9083 return; 9084 } 9085 // No need to add this to end of @implementation. 9086 else 9087 return; 9088 } 9089 // All conditions are met. Add a new bitfield to the tail end of ivars. 9090 llvm::APInt Zero(Context.getTypeSize(Context.IntTy), 0); 9091 Expr * BW = IntegerLiteral::Create(Context, Zero, Context.IntTy, DeclLoc); 9092 9093 Ivar = ObjCIvarDecl::Create(Context, cast<ObjCContainerDecl>(CurContext), 9094 DeclLoc, DeclLoc, 0, 9095 Context.CharTy, 9096 Context.getTrivialTypeSourceInfo(Context.CharTy, 9097 DeclLoc), 9098 ObjCIvarDecl::Private, BW, 9099 true); 9100 AllIvarDecls.push_back(Ivar); 9101} 9102 9103void Sema::ActOnFields(Scope* S, 9104 SourceLocation RecLoc, Decl *EnclosingDecl, 9105 llvm::ArrayRef<Decl *> Fields, 9106 SourceLocation LBrac, SourceLocation RBrac, 9107 AttributeList *Attr) { 9108 assert(EnclosingDecl && "missing record or interface decl"); 9109 9110 // If the decl this is being inserted into is invalid, then it may be a 9111 // redeclaration or some other bogus case. Don't try to add fields to it. 9112 if (EnclosingDecl->isInvalidDecl()) 9113 return; 9114 9115 // Verify that all the fields are okay. 9116 unsigned NumNamedMembers = 0; 9117 SmallVector<FieldDecl*, 32> RecFields; 9118 9119 RecordDecl *Record = dyn_cast<RecordDecl>(EnclosingDecl); 9120 bool ARCErrReported = false; 9121 for (llvm::ArrayRef<Decl *>::iterator i = Fields.begin(), end = Fields.end(); 9122 i != end; ++i) { 9123 FieldDecl *FD = cast<FieldDecl>(*i); 9124 9125 // Get the type for the field. 9126 const Type *FDTy = FD->getType().getTypePtr(); 9127 9128 if (!FD->isAnonymousStructOrUnion()) { 9129 // Remember all fields written by the user. 9130 RecFields.push_back(FD); 9131 } 9132 9133 // If the field is already invalid for some reason, don't emit more 9134 // diagnostics about it. 9135 if (FD->isInvalidDecl()) { 9136 EnclosingDecl->setInvalidDecl(); 9137 continue; 9138 } 9139 9140 // C99 6.7.2.1p2: 9141 // A structure or union shall not contain a member with 9142 // incomplete or function type (hence, a structure shall not 9143 // contain an instance of itself, but may contain a pointer to 9144 // an instance of itself), except that the last member of a 9145 // structure with more than one named member may have incomplete 9146 // array type; such a structure (and any union containing, 9147 // possibly recursively, a member that is such a structure) 9148 // shall not be a member of a structure or an element of an 9149 // array. 9150 if (FDTy->isFunctionType()) { 9151 // Field declared as a function. 9152 Diag(FD->getLocation(), diag::err_field_declared_as_function) 9153 << FD->getDeclName(); 9154 FD->setInvalidDecl(); 9155 EnclosingDecl->setInvalidDecl(); 9156 continue; 9157 } else if (FDTy->isIncompleteArrayType() && Record && 9158 ((i + 1 == Fields.end() && !Record->isUnion()) || 9159 ((getLangOptions().MicrosoftExt || 9160 getLangOptions().CPlusPlus) && 9161 (i + 1 == Fields.end() || Record->isUnion())))) { 9162 // Flexible array member. 9163 // Microsoft and g++ is more permissive regarding flexible array. 9164 // It will accept flexible array in union and also 9165 // as the sole element of a struct/class. 9166 if (getLangOptions().MicrosoftExt) { 9167 if (Record->isUnion()) 9168 Diag(FD->getLocation(), diag::ext_flexible_array_union_ms) 9169 << FD->getDeclName(); 9170 else if (Fields.size() == 1) 9171 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_ms) 9172 << FD->getDeclName() << Record->getTagKind(); 9173 } else if (getLangOptions().CPlusPlus) { 9174 if (Record->isUnion()) 9175 Diag(FD->getLocation(), diag::ext_flexible_array_union_gnu) 9176 << FD->getDeclName(); 9177 else if (Fields.size() == 1) 9178 Diag(FD->getLocation(), diag::ext_flexible_array_empty_aggregate_gnu) 9179 << FD->getDeclName() << Record->getTagKind(); 9180 } else if (NumNamedMembers < 1) { 9181 Diag(FD->getLocation(), diag::err_flexible_array_empty_struct) 9182 << FD->getDeclName(); 9183 FD->setInvalidDecl(); 9184 EnclosingDecl->setInvalidDecl(); 9185 continue; 9186 } 9187 if (!FD->getType()->isDependentType() && 9188 !Context.getBaseElementType(FD->getType()).isPODType(Context)) { 9189 Diag(FD->getLocation(), diag::err_flexible_array_has_nonpod_type) 9190 << FD->getDeclName() << FD->getType(); 9191 FD->setInvalidDecl(); 9192 EnclosingDecl->setInvalidDecl(); 9193 continue; 9194 } 9195 // Okay, we have a legal flexible array member at the end of the struct. 9196 if (Record) 9197 Record->setHasFlexibleArrayMember(true); 9198 } else if (!FDTy->isDependentType() && 9199 RequireCompleteType(FD->getLocation(), FD->getType(), 9200 diag::err_field_incomplete)) { 9201 // Incomplete type 9202 FD->setInvalidDecl(); 9203 EnclosingDecl->setInvalidDecl(); 9204 continue; 9205 } else if (const RecordType *FDTTy = FDTy->getAs<RecordType>()) { 9206 if (FDTTy->getDecl()->hasFlexibleArrayMember()) { 9207 // If this is a member of a union, then entire union becomes "flexible". 9208 if (Record && Record->isUnion()) { 9209 Record->setHasFlexibleArrayMember(true); 9210 } else { 9211 // If this is a struct/class and this is not the last element, reject 9212 // it. Note that GCC supports variable sized arrays in the middle of 9213 // structures. 9214 if (i + 1 != Fields.end()) 9215 Diag(FD->getLocation(), diag::ext_variable_sized_type_in_struct) 9216 << FD->getDeclName() << FD->getType(); 9217 else { 9218 // We support flexible arrays at the end of structs in 9219 // other structs as an extension. 9220 Diag(FD->getLocation(), diag::ext_flexible_array_in_struct) 9221 << FD->getDeclName(); 9222 if (Record) 9223 Record->setHasFlexibleArrayMember(true); 9224 } 9225 } 9226 } 9227 if (Record && FDTTy->getDecl()->hasObjectMember()) 9228 Record->setHasObjectMember(true); 9229 } else if (FDTy->isObjCObjectType()) { 9230 /// A field cannot be an Objective-c object 9231 Diag(FD->getLocation(), diag::err_statically_allocated_object) 9232 << FixItHint::CreateInsertion(FD->getLocation(), "*"); 9233 QualType T = Context.getObjCObjectPointerType(FD->getType()); 9234 FD->setType(T); 9235 } 9236 else if (!getLangOptions().CPlusPlus) { 9237 if (getLangOptions().ObjCAutoRefCount && Record && !ARCErrReported) { 9238 // It's an error in ARC if a field has lifetime. 9239 // We don't want to report this in a system header, though, 9240 // so we just make the field unavailable. 9241 // FIXME: that's really not sufficient; we need to make the type 9242 // itself invalid to, say, initialize or copy. 9243 QualType T = FD->getType(); 9244 Qualifiers::ObjCLifetime lifetime = T.getObjCLifetime(); 9245 if (lifetime && lifetime != Qualifiers::OCL_ExplicitNone) { 9246 SourceLocation loc = FD->getLocation(); 9247 if (getSourceManager().isInSystemHeader(loc)) { 9248 if (!FD->hasAttr<UnavailableAttr>()) { 9249 FD->addAttr(new (Context) UnavailableAttr(loc, Context, 9250 "this system field has retaining ownership")); 9251 } 9252 } else { 9253 Diag(FD->getLocation(), diag::err_arc_objc_object_in_struct) 9254 << T->isBlockPointerType(); 9255 } 9256 ARCErrReported = true; 9257 } 9258 } 9259 else if (getLangOptions().ObjC1 && 9260 getLangOptions().getGC() != LangOptions::NonGC && 9261 Record && !Record->hasObjectMember()) { 9262 if (FD->getType()->isObjCObjectPointerType() || 9263 FD->getType().isObjCGCStrong()) 9264 Record->setHasObjectMember(true); 9265 else if (Context.getAsArrayType(FD->getType())) { 9266 QualType BaseType = Context.getBaseElementType(FD->getType()); 9267 if (BaseType->isRecordType() && 9268 BaseType->getAs<RecordType>()->getDecl()->hasObjectMember()) 9269 Record->setHasObjectMember(true); 9270 else if (BaseType->isObjCObjectPointerType() || 9271 BaseType.isObjCGCStrong()) 9272 Record->setHasObjectMember(true); 9273 } 9274 } 9275 } 9276 // Keep track of the number of named members. 9277 if (FD->getIdentifier()) 9278 ++NumNamedMembers; 9279 } 9280 9281 // Okay, we successfully defined 'Record'. 9282 if (Record) { 9283 bool Completed = false; 9284 if (CXXRecordDecl *CXXRecord = dyn_cast<CXXRecordDecl>(Record)) { 9285 if (!CXXRecord->isInvalidDecl()) { 9286 // Set access bits correctly on the directly-declared conversions. 9287 UnresolvedSetImpl *Convs = CXXRecord->getConversionFunctions(); 9288 for (UnresolvedSetIterator I = Convs->begin(), E = Convs->end(); 9289 I != E; ++I) 9290 Convs->setAccess(I, (*I)->getAccess()); 9291 9292 if (!CXXRecord->isDependentType()) { 9293 // Objective-C Automatic Reference Counting: 9294 // If a class has a non-static data member of Objective-C pointer 9295 // type (or array thereof), it is a non-POD type and its 9296 // default constructor (if any), copy constructor, copy assignment 9297 // operator, and destructor are non-trivial. 9298 // 9299 // This rule is also handled by CXXRecordDecl::completeDefinition(). 9300 // However, here we check whether this particular class is only 9301 // non-POD because of the presence of an Objective-C pointer member. 9302 // If so, objects of this type cannot be shared between code compiled 9303 // with instant objects and code compiled with manual retain/release. 9304 if (getLangOptions().ObjCAutoRefCount && 9305 CXXRecord->hasObjectMember() && 9306 CXXRecord->getLinkage() == ExternalLinkage) { 9307 if (CXXRecord->isPOD()) { 9308 Diag(CXXRecord->getLocation(), 9309 diag::warn_arc_non_pod_class_with_object_member) 9310 << CXXRecord; 9311 } else { 9312 // FIXME: Fix-Its would be nice here, but finding a good location 9313 // for them is going to be tricky. 9314 if (CXXRecord->hasTrivialCopyConstructor()) 9315 Diag(CXXRecord->getLocation(), 9316 diag::warn_arc_trivial_member_function_with_object_member) 9317 << CXXRecord << 0; 9318 if (CXXRecord->hasTrivialCopyAssignment()) 9319 Diag(CXXRecord->getLocation(), 9320 diag::warn_arc_trivial_member_function_with_object_member) 9321 << CXXRecord << 1; 9322 if (CXXRecord->hasTrivialDestructor()) 9323 Diag(CXXRecord->getLocation(), 9324 diag::warn_arc_trivial_member_function_with_object_member) 9325 << CXXRecord << 2; 9326 } 9327 } 9328 9329 // Adjust user-defined destructor exception spec. 9330 if (getLangOptions().CPlusPlus0x && 9331 CXXRecord->hasUserDeclaredDestructor()) 9332 AdjustDestructorExceptionSpec(CXXRecord,CXXRecord->getDestructor()); 9333 9334 // Add any implicitly-declared members to this class. 9335 AddImplicitlyDeclaredMembersToClass(CXXRecord); 9336 9337 // If we have virtual base classes, we may end up finding multiple 9338 // final overriders for a given virtual function. Check for this 9339 // problem now. 9340 if (CXXRecord->getNumVBases()) { 9341 CXXFinalOverriderMap FinalOverriders; 9342 CXXRecord->getFinalOverriders(FinalOverriders); 9343 9344 for (CXXFinalOverriderMap::iterator M = FinalOverriders.begin(), 9345 MEnd = FinalOverriders.end(); 9346 M != MEnd; ++M) { 9347 for (OverridingMethods::iterator SO = M->second.begin(), 9348 SOEnd = M->second.end(); 9349 SO != SOEnd; ++SO) { 9350 assert(SO->second.size() > 0 && 9351 "Virtual function without overridding functions?"); 9352 if (SO->second.size() == 1) 9353 continue; 9354 9355 // C++ [class.virtual]p2: 9356 // In a derived class, if a virtual member function of a base 9357 // class subobject has more than one final overrider the 9358 // program is ill-formed. 9359 Diag(Record->getLocation(), diag::err_multiple_final_overriders) 9360 << (NamedDecl *)M->first << Record; 9361 Diag(M->first->getLocation(), 9362 diag::note_overridden_virtual_function); 9363 for (OverridingMethods::overriding_iterator 9364 OM = SO->second.begin(), 9365 OMEnd = SO->second.end(); 9366 OM != OMEnd; ++OM) 9367 Diag(OM->Method->getLocation(), diag::note_final_overrider) 9368 << (NamedDecl *)M->first << OM->Method->getParent(); 9369 9370 Record->setInvalidDecl(); 9371 } 9372 } 9373 CXXRecord->completeDefinition(&FinalOverriders); 9374 Completed = true; 9375 } 9376 } 9377 } 9378 } 9379 9380 if (!Completed) 9381 Record->completeDefinition(); 9382 9383 // Now that the record is complete, do any delayed exception spec checks 9384 // we were missing. 9385 while (!DelayedDestructorExceptionSpecChecks.empty()) { 9386 const CXXDestructorDecl *Dtor = 9387 DelayedDestructorExceptionSpecChecks.back().first; 9388 if (Dtor->getParent() != Record) 9389 break; 9390 9391 assert(!Dtor->getParent()->isDependentType() && 9392 "Should not ever add destructors of templates into the list."); 9393 CheckOverridingFunctionExceptionSpec(Dtor, 9394 DelayedDestructorExceptionSpecChecks.back().second); 9395 DelayedDestructorExceptionSpecChecks.pop_back(); 9396 } 9397 9398 } else { 9399 ObjCIvarDecl **ClsFields = 9400 reinterpret_cast<ObjCIvarDecl**>(RecFields.data()); 9401 if (ObjCInterfaceDecl *ID = dyn_cast<ObjCInterfaceDecl>(EnclosingDecl)) { 9402 ID->setEndOfDefinitionLoc(RBrac); 9403 // Add ivar's to class's DeclContext. 9404 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 9405 ClsFields[i]->setLexicalDeclContext(ID); 9406 ID->addDecl(ClsFields[i]); 9407 } 9408 // Must enforce the rule that ivars in the base classes may not be 9409 // duplicates. 9410 if (ID->getSuperClass()) 9411 DiagnoseDuplicateIvars(ID, ID->getSuperClass()); 9412 } else if (ObjCImplementationDecl *IMPDecl = 9413 dyn_cast<ObjCImplementationDecl>(EnclosingDecl)) { 9414 assert(IMPDecl && "ActOnFields - missing ObjCImplementationDecl"); 9415 for (unsigned I = 0, N = RecFields.size(); I != N; ++I) 9416 // Ivar declared in @implementation never belongs to the implementation. 9417 // Only it is in implementation's lexical context. 9418 ClsFields[I]->setLexicalDeclContext(IMPDecl); 9419 CheckImplementationIvars(IMPDecl, ClsFields, RecFields.size(), RBrac); 9420 } else if (ObjCCategoryDecl *CDecl = 9421 dyn_cast<ObjCCategoryDecl>(EnclosingDecl)) { 9422 // case of ivars in class extension; all other cases have been 9423 // reported as errors elsewhere. 9424 // FIXME. Class extension does not have a LocEnd field. 9425 // CDecl->setLocEnd(RBrac); 9426 // Add ivar's to class extension's DeclContext. 9427 // Diagnose redeclaration of private ivars. 9428 ObjCInterfaceDecl *IDecl = CDecl->getClassInterface(); 9429 for (unsigned i = 0, e = RecFields.size(); i != e; ++i) { 9430 if (IDecl) { 9431 if (const ObjCIvarDecl *ClsIvar = 9432 IDecl->getIvarDecl(ClsFields[i]->getIdentifier())) { 9433 Diag(ClsFields[i]->getLocation(), 9434 diag::err_duplicate_ivar_declaration); 9435 Diag(ClsIvar->getLocation(), diag::note_previous_definition); 9436 continue; 9437 } 9438 for (const ObjCCategoryDecl *ClsExtDecl = 9439 IDecl->getFirstClassExtension(); 9440 ClsExtDecl; ClsExtDecl = ClsExtDecl->getNextClassExtension()) { 9441 if (const ObjCIvarDecl *ClsExtIvar = 9442 ClsExtDecl->getIvarDecl(ClsFields[i]->getIdentifier())) { 9443 Diag(ClsFields[i]->getLocation(), 9444 diag::err_duplicate_ivar_declaration); 9445 Diag(ClsExtIvar->getLocation(), diag::note_previous_definition); 9446 continue; 9447 } 9448 } 9449 } 9450 ClsFields[i]->setLexicalDeclContext(CDecl); 9451 CDecl->addDecl(ClsFields[i]); 9452 } 9453 } 9454 } 9455 9456 if (Attr) 9457 ProcessDeclAttributeList(S, Record, Attr); 9458 9459 // If there's a #pragma GCC visibility in scope, and this isn't a subclass, 9460 // set the visibility of this record. 9461 if (Record && !Record->getDeclContext()->isRecord()) 9462 AddPushedVisibilityAttribute(Record); 9463} 9464 9465/// \brief Determine whether the given integral value is representable within 9466/// the given type T. 9467static bool isRepresentableIntegerValue(ASTContext &Context, 9468 llvm::APSInt &Value, 9469 QualType T) { 9470 assert(T->isIntegralType(Context) && "Integral type required!"); 9471 unsigned BitWidth = Context.getIntWidth(T); 9472 9473 if (Value.isUnsigned() || Value.isNonNegative()) { 9474 if (T->isSignedIntegerOrEnumerationType()) 9475 --BitWidth; 9476 return Value.getActiveBits() <= BitWidth; 9477 } 9478 return Value.getMinSignedBits() <= BitWidth; 9479} 9480 9481// \brief Given an integral type, return the next larger integral type 9482// (or a NULL type of no such type exists). 9483static QualType getNextLargerIntegralType(ASTContext &Context, QualType T) { 9484 // FIXME: Int128/UInt128 support, which also needs to be introduced into 9485 // enum checking below. 9486 assert(T->isIntegralType(Context) && "Integral type required!"); 9487 const unsigned NumTypes = 4; 9488 QualType SignedIntegralTypes[NumTypes] = { 9489 Context.ShortTy, Context.IntTy, Context.LongTy, Context.LongLongTy 9490 }; 9491 QualType UnsignedIntegralTypes[NumTypes] = { 9492 Context.UnsignedShortTy, Context.UnsignedIntTy, Context.UnsignedLongTy, 9493 Context.UnsignedLongLongTy 9494 }; 9495 9496 unsigned BitWidth = Context.getTypeSize(T); 9497 QualType *Types = T->isSignedIntegerOrEnumerationType()? SignedIntegralTypes 9498 : UnsignedIntegralTypes; 9499 for (unsigned I = 0; I != NumTypes; ++I) 9500 if (Context.getTypeSize(Types[I]) > BitWidth) 9501 return Types[I]; 9502 9503 return QualType(); 9504} 9505 9506EnumConstantDecl *Sema::CheckEnumConstant(EnumDecl *Enum, 9507 EnumConstantDecl *LastEnumConst, 9508 SourceLocation IdLoc, 9509 IdentifierInfo *Id, 9510 Expr *Val) { 9511 unsigned IntWidth = Context.getTargetInfo().getIntWidth(); 9512 llvm::APSInt EnumVal(IntWidth); 9513 QualType EltTy; 9514 9515 if (Val && DiagnoseUnexpandedParameterPack(Val, UPPC_EnumeratorValue)) 9516 Val = 0; 9517 9518 if (Val) 9519 Val = DefaultLvalueConversion(Val).take(); 9520 9521 if (Val) { 9522 if (Enum->isDependentType() || Val->isTypeDependent()) 9523 EltTy = Context.DependentTy; 9524 else { 9525 // C99 6.7.2.2p2: Make sure we have an integer constant expression. 9526 SourceLocation ExpLoc; 9527 if (!Val->isValueDependent() && 9528 VerifyIntegerConstantExpression(Val, &EnumVal)) { 9529 Val = 0; 9530 } else { 9531 if (!getLangOptions().CPlusPlus) { 9532 // C99 6.7.2.2p2: 9533 // The expression that defines the value of an enumeration constant 9534 // shall be an integer constant expression that has a value 9535 // representable as an int. 9536 9537 // Complain if the value is not representable in an int. 9538 if (!isRepresentableIntegerValue(Context, EnumVal, Context.IntTy)) 9539 Diag(IdLoc, diag::ext_enum_value_not_int) 9540 << EnumVal.toString(10) << Val->getSourceRange() 9541 << (EnumVal.isUnsigned() || EnumVal.isNonNegative()); 9542 else if (!Context.hasSameType(Val->getType(), Context.IntTy)) { 9543 // Force the type of the expression to 'int'. 9544 Val = ImpCastExprToType(Val, Context.IntTy, CK_IntegralCast).take(); 9545 } 9546 } 9547 9548 if (Enum->isFixed()) { 9549 EltTy = Enum->getIntegerType(); 9550 9551 // C++0x [dcl.enum]p5: 9552 // ... if the initializing value of an enumerator cannot be 9553 // represented by the underlying type, the program is ill-formed. 9554 if (!isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 9555 if (getLangOptions().MicrosoftExt) { 9556 Diag(IdLoc, diag::ext_enumerator_too_large) << EltTy; 9557 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 9558 } else 9559 Diag(IdLoc, diag::err_enumerator_too_large) 9560 << EltTy; 9561 } else 9562 Val = ImpCastExprToType(Val, EltTy, CK_IntegralCast).take(); 9563 } 9564 else { 9565 // C++0x [dcl.enum]p5: 9566 // If the underlying type is not fixed, the type of each enumerator 9567 // is the type of its initializing value: 9568 // - If an initializer is specified for an enumerator, the 9569 // initializing value has the same type as the expression. 9570 EltTy = Val->getType(); 9571 } 9572 } 9573 } 9574 } 9575 9576 if (!Val) { 9577 if (Enum->isDependentType()) 9578 EltTy = Context.DependentTy; 9579 else if (!LastEnumConst) { 9580 // C++0x [dcl.enum]p5: 9581 // If the underlying type is not fixed, the type of each enumerator 9582 // is the type of its initializing value: 9583 // - If no initializer is specified for the first enumerator, the 9584 // initializing value has an unspecified integral type. 9585 // 9586 // GCC uses 'int' for its unspecified integral type, as does 9587 // C99 6.7.2.2p3. 9588 if (Enum->isFixed()) { 9589 EltTy = Enum->getIntegerType(); 9590 } 9591 else { 9592 EltTy = Context.IntTy; 9593 } 9594 } else { 9595 // Assign the last value + 1. 9596 EnumVal = LastEnumConst->getInitVal(); 9597 ++EnumVal; 9598 EltTy = LastEnumConst->getType(); 9599 9600 // Check for overflow on increment. 9601 if (EnumVal < LastEnumConst->getInitVal()) { 9602 // C++0x [dcl.enum]p5: 9603 // If the underlying type is not fixed, the type of each enumerator 9604 // is the type of its initializing value: 9605 // 9606 // - Otherwise the type of the initializing value is the same as 9607 // the type of the initializing value of the preceding enumerator 9608 // unless the incremented value is not representable in that type, 9609 // in which case the type is an unspecified integral type 9610 // sufficient to contain the incremented value. If no such type 9611 // exists, the program is ill-formed. 9612 QualType T = getNextLargerIntegralType(Context, EltTy); 9613 if (T.isNull() || Enum->isFixed()) { 9614 // There is no integral type larger enough to represent this 9615 // value. Complain, then allow the value to wrap around. 9616 EnumVal = LastEnumConst->getInitVal(); 9617 EnumVal = EnumVal.zext(EnumVal.getBitWidth() * 2); 9618 ++EnumVal; 9619 if (Enum->isFixed()) 9620 // When the underlying type is fixed, this is ill-formed. 9621 Diag(IdLoc, diag::err_enumerator_wrapped) 9622 << EnumVal.toString(10) 9623 << EltTy; 9624 else 9625 Diag(IdLoc, diag::warn_enumerator_too_large) 9626 << EnumVal.toString(10); 9627 } else { 9628 EltTy = T; 9629 } 9630 9631 // Retrieve the last enumerator's value, extent that type to the 9632 // type that is supposed to be large enough to represent the incremented 9633 // value, then increment. 9634 EnumVal = LastEnumConst->getInitVal(); 9635 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 9636 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 9637 ++EnumVal; 9638 9639 // If we're not in C++, diagnose the overflow of enumerator values, 9640 // which in C99 means that the enumerator value is not representable in 9641 // an int (C99 6.7.2.2p2). However, we support GCC's extension that 9642 // permits enumerator values that are representable in some larger 9643 // integral type. 9644 if (!getLangOptions().CPlusPlus && !T.isNull()) 9645 Diag(IdLoc, diag::warn_enum_value_overflow); 9646 } else if (!getLangOptions().CPlusPlus && 9647 !isRepresentableIntegerValue(Context, EnumVal, EltTy)) { 9648 // Enforce C99 6.7.2.2p2 even when we compute the next value. 9649 Diag(IdLoc, diag::ext_enum_value_not_int) 9650 << EnumVal.toString(10) << 1; 9651 } 9652 } 9653 } 9654 9655 if (!EltTy->isDependentType()) { 9656 // Make the enumerator value match the signedness and size of the 9657 // enumerator's type. 9658 EnumVal = EnumVal.zextOrTrunc(Context.getIntWidth(EltTy)); 9659 EnumVal.setIsSigned(EltTy->isSignedIntegerOrEnumerationType()); 9660 } 9661 9662 return EnumConstantDecl::Create(Context, Enum, IdLoc, Id, EltTy, 9663 Val, EnumVal); 9664} 9665 9666 9667Decl *Sema::ActOnEnumConstant(Scope *S, Decl *theEnumDecl, Decl *lastEnumConst, 9668 SourceLocation IdLoc, IdentifierInfo *Id, 9669 AttributeList *Attr, 9670 SourceLocation EqualLoc, Expr *val) { 9671 EnumDecl *TheEnumDecl = cast<EnumDecl>(theEnumDecl); 9672 EnumConstantDecl *LastEnumConst = 9673 cast_or_null<EnumConstantDecl>(lastEnumConst); 9674 Expr *Val = static_cast<Expr*>(val); 9675 9676 // The scope passed in may not be a decl scope. Zip up the scope tree until 9677 // we find one that is. 9678 S = getNonFieldDeclScope(S); 9679 9680 // Verify that there isn't already something declared with this name in this 9681 // scope. 9682 NamedDecl *PrevDecl = LookupSingleName(S, Id, IdLoc, LookupOrdinaryName, 9683 ForRedeclaration); 9684 if (PrevDecl && PrevDecl->isTemplateParameter()) { 9685 // Maybe we will complain about the shadowed template parameter. 9686 DiagnoseTemplateParameterShadow(IdLoc, PrevDecl); 9687 // Just pretend that we didn't see the previous declaration. 9688 PrevDecl = 0; 9689 } 9690 9691 if (PrevDecl) { 9692 // When in C++, we may get a TagDecl with the same name; in this case the 9693 // enum constant will 'hide' the tag. 9694 assert((getLangOptions().CPlusPlus || !isa<TagDecl>(PrevDecl)) && 9695 "Received TagDecl when not in C++!"); 9696 if (!isa<TagDecl>(PrevDecl) && isDeclInScope(PrevDecl, CurContext, S)) { 9697 if (isa<EnumConstantDecl>(PrevDecl)) 9698 Diag(IdLoc, diag::err_redefinition_of_enumerator) << Id; 9699 else 9700 Diag(IdLoc, diag::err_redefinition) << Id; 9701 Diag(PrevDecl->getLocation(), diag::note_previous_definition); 9702 return 0; 9703 } 9704 } 9705 9706 // C++ [class.mem]p13: 9707 // If T is the name of a class, then each of the following shall have a 9708 // name different from T: 9709 // - every enumerator of every member of class T that is an enumerated 9710 // type 9711 if (CXXRecordDecl *Record 9712 = dyn_cast<CXXRecordDecl>( 9713 TheEnumDecl->getDeclContext()->getRedeclContext())) 9714 if (Record->getIdentifier() && Record->getIdentifier() == Id) 9715 Diag(IdLoc, diag::err_member_name_of_class) << Id; 9716 9717 EnumConstantDecl *New = 9718 CheckEnumConstant(TheEnumDecl, LastEnumConst, IdLoc, Id, Val); 9719 9720 if (New) { 9721 // Process attributes. 9722 if (Attr) ProcessDeclAttributeList(S, New, Attr); 9723 9724 // Register this decl in the current scope stack. 9725 New->setAccess(TheEnumDecl->getAccess()); 9726 PushOnScopeChains(New, S); 9727 } 9728 9729 return New; 9730} 9731 9732void Sema::ActOnEnumBody(SourceLocation EnumLoc, SourceLocation LBraceLoc, 9733 SourceLocation RBraceLoc, Decl *EnumDeclX, 9734 Decl **Elements, unsigned NumElements, 9735 Scope *S, AttributeList *Attr) { 9736 EnumDecl *Enum = cast<EnumDecl>(EnumDeclX); 9737 QualType EnumType = Context.getTypeDeclType(Enum); 9738 9739 if (Attr) 9740 ProcessDeclAttributeList(S, Enum, Attr); 9741 9742 if (Enum->isDependentType()) { 9743 for (unsigned i = 0; i != NumElements; ++i) { 9744 EnumConstantDecl *ECD = 9745 cast_or_null<EnumConstantDecl>(Elements[i]); 9746 if (!ECD) continue; 9747 9748 ECD->setType(EnumType); 9749 } 9750 9751 Enum->completeDefinition(Context.DependentTy, Context.DependentTy, 0, 0); 9752 return; 9753 } 9754 9755 // TODO: If the result value doesn't fit in an int, it must be a long or long 9756 // long value. ISO C does not support this, but GCC does as an extension, 9757 // emit a warning. 9758 unsigned IntWidth = Context.getTargetInfo().getIntWidth(); 9759 unsigned CharWidth = Context.getTargetInfo().getCharWidth(); 9760 unsigned ShortWidth = Context.getTargetInfo().getShortWidth(); 9761 9762 // Verify that all the values are okay, compute the size of the values, and 9763 // reverse the list. 9764 unsigned NumNegativeBits = 0; 9765 unsigned NumPositiveBits = 0; 9766 9767 // Keep track of whether all elements have type int. 9768 bool AllElementsInt = true; 9769 9770 for (unsigned i = 0; i != NumElements; ++i) { 9771 EnumConstantDecl *ECD = 9772 cast_or_null<EnumConstantDecl>(Elements[i]); 9773 if (!ECD) continue; // Already issued a diagnostic. 9774 9775 const llvm::APSInt &InitVal = ECD->getInitVal(); 9776 9777 // Keep track of the size of positive and negative values. 9778 if (InitVal.isUnsigned() || InitVal.isNonNegative()) 9779 NumPositiveBits = std::max(NumPositiveBits, 9780 (unsigned)InitVal.getActiveBits()); 9781 else 9782 NumNegativeBits = std::max(NumNegativeBits, 9783 (unsigned)InitVal.getMinSignedBits()); 9784 9785 // Keep track of whether every enum element has type int (very commmon). 9786 if (AllElementsInt) 9787 AllElementsInt = ECD->getType() == Context.IntTy; 9788 } 9789 9790 // Figure out the type that should be used for this enum. 9791 QualType BestType; 9792 unsigned BestWidth; 9793 9794 // C++0x N3000 [conv.prom]p3: 9795 // An rvalue of an unscoped enumeration type whose underlying 9796 // type is not fixed can be converted to an rvalue of the first 9797 // of the following types that can represent all the values of 9798 // the enumeration: int, unsigned int, long int, unsigned long 9799 // int, long long int, or unsigned long long int. 9800 // C99 6.4.4.3p2: 9801 // An identifier declared as an enumeration constant has type int. 9802 // The C99 rule is modified by a gcc extension 9803 QualType BestPromotionType; 9804 9805 bool Packed = Enum->getAttr<PackedAttr>() ? true : false; 9806 // -fshort-enums is the equivalent to specifying the packed attribute on all 9807 // enum definitions. 9808 if (LangOpts.ShortEnums) 9809 Packed = true; 9810 9811 if (Enum->isFixed()) { 9812 BestType = Enum->getIntegerType(); 9813 if (BestType->isPromotableIntegerType()) 9814 BestPromotionType = Context.getPromotedIntegerType(BestType); 9815 else 9816 BestPromotionType = BestType; 9817 // We don't need to set BestWidth, because BestType is going to be the type 9818 // of the enumerators, but we do anyway because otherwise some compilers 9819 // warn that it might be used uninitialized. 9820 BestWidth = CharWidth; 9821 } 9822 else if (NumNegativeBits) { 9823 // If there is a negative value, figure out the smallest integer type (of 9824 // int/long/longlong) that fits. 9825 // If it's packed, check also if it fits a char or a short. 9826 if (Packed && NumNegativeBits <= CharWidth && NumPositiveBits < CharWidth) { 9827 BestType = Context.SignedCharTy; 9828 BestWidth = CharWidth; 9829 } else if (Packed && NumNegativeBits <= ShortWidth && 9830 NumPositiveBits < ShortWidth) { 9831 BestType = Context.ShortTy; 9832 BestWidth = ShortWidth; 9833 } else if (NumNegativeBits <= IntWidth && NumPositiveBits < IntWidth) { 9834 BestType = Context.IntTy; 9835 BestWidth = IntWidth; 9836 } else { 9837 BestWidth = Context.getTargetInfo().getLongWidth(); 9838 9839 if (NumNegativeBits <= BestWidth && NumPositiveBits < BestWidth) { 9840 BestType = Context.LongTy; 9841 } else { 9842 BestWidth = Context.getTargetInfo().getLongLongWidth(); 9843 9844 if (NumNegativeBits > BestWidth || NumPositiveBits >= BestWidth) 9845 Diag(Enum->getLocation(), diag::warn_enum_too_large); 9846 BestType = Context.LongLongTy; 9847 } 9848 } 9849 BestPromotionType = (BestWidth <= IntWidth ? Context.IntTy : BestType); 9850 } else { 9851 // If there is no negative value, figure out the smallest type that fits 9852 // all of the enumerator values. 9853 // If it's packed, check also if it fits a char or a short. 9854 if (Packed && NumPositiveBits <= CharWidth) { 9855 BestType = Context.UnsignedCharTy; 9856 BestPromotionType = Context.IntTy; 9857 BestWidth = CharWidth; 9858 } else if (Packed && NumPositiveBits <= ShortWidth) { 9859 BestType = Context.UnsignedShortTy; 9860 BestPromotionType = Context.IntTy; 9861 BestWidth = ShortWidth; 9862 } else if (NumPositiveBits <= IntWidth) { 9863 BestType = Context.UnsignedIntTy; 9864 BestWidth = IntWidth; 9865 BestPromotionType 9866 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9867 ? Context.UnsignedIntTy : Context.IntTy; 9868 } else if (NumPositiveBits <= 9869 (BestWidth = Context.getTargetInfo().getLongWidth())) { 9870 BestType = Context.UnsignedLongTy; 9871 BestPromotionType 9872 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9873 ? Context.UnsignedLongTy : Context.LongTy; 9874 } else { 9875 BestWidth = Context.getTargetInfo().getLongLongWidth(); 9876 assert(NumPositiveBits <= BestWidth && 9877 "How could an initializer get larger than ULL?"); 9878 BestType = Context.UnsignedLongLongTy; 9879 BestPromotionType 9880 = (NumPositiveBits == BestWidth || !getLangOptions().CPlusPlus) 9881 ? Context.UnsignedLongLongTy : Context.LongLongTy; 9882 } 9883 } 9884 9885 // Loop over all of the enumerator constants, changing their types to match 9886 // the type of the enum if needed. 9887 for (unsigned i = 0; i != NumElements; ++i) { 9888 EnumConstantDecl *ECD = cast_or_null<EnumConstantDecl>(Elements[i]); 9889 if (!ECD) continue; // Already issued a diagnostic. 9890 9891 // Standard C says the enumerators have int type, but we allow, as an 9892 // extension, the enumerators to be larger than int size. If each 9893 // enumerator value fits in an int, type it as an int, otherwise type it the 9894 // same as the enumerator decl itself. This means that in "enum { X = 1U }" 9895 // that X has type 'int', not 'unsigned'. 9896 9897 // Determine whether the value fits into an int. 9898 llvm::APSInt InitVal = ECD->getInitVal(); 9899 9900 // If it fits into an integer type, force it. Otherwise force it to match 9901 // the enum decl type. 9902 QualType NewTy; 9903 unsigned NewWidth; 9904 bool NewSign; 9905 if (!getLangOptions().CPlusPlus && 9906 !Enum->isFixed() && 9907 isRepresentableIntegerValue(Context, InitVal, Context.IntTy)) { 9908 NewTy = Context.IntTy; 9909 NewWidth = IntWidth; 9910 NewSign = true; 9911 } else if (ECD->getType() == BestType) { 9912 // Already the right type! 9913 if (getLangOptions().CPlusPlus) 9914 // C++ [dcl.enum]p4: Following the closing brace of an 9915 // enum-specifier, each enumerator has the type of its 9916 // enumeration. 9917 ECD->setType(EnumType); 9918 continue; 9919 } else { 9920 NewTy = BestType; 9921 NewWidth = BestWidth; 9922 NewSign = BestType->isSignedIntegerOrEnumerationType(); 9923 } 9924 9925 // Adjust the APSInt value. 9926 InitVal = InitVal.extOrTrunc(NewWidth); 9927 InitVal.setIsSigned(NewSign); 9928 ECD->setInitVal(InitVal); 9929 9930 // Adjust the Expr initializer and type. 9931 if (ECD->getInitExpr() && 9932 !Context.hasSameType(NewTy, ECD->getInitExpr()->getType())) 9933 ECD->setInitExpr(ImplicitCastExpr::Create(Context, NewTy, 9934 CK_IntegralCast, 9935 ECD->getInitExpr(), 9936 /*base paths*/ 0, 9937 VK_RValue)); 9938 if (getLangOptions().CPlusPlus) 9939 // C++ [dcl.enum]p4: Following the closing brace of an 9940 // enum-specifier, each enumerator has the type of its 9941 // enumeration. 9942 ECD->setType(EnumType); 9943 else 9944 ECD->setType(NewTy); 9945 } 9946 9947 Enum->completeDefinition(BestType, BestPromotionType, 9948 NumPositiveBits, NumNegativeBits); 9949} 9950 9951Decl *Sema::ActOnFileScopeAsmDecl(Expr *expr, 9952 SourceLocation StartLoc, 9953 SourceLocation EndLoc) { 9954 StringLiteral *AsmString = cast<StringLiteral>(expr); 9955 9956 FileScopeAsmDecl *New = FileScopeAsmDecl::Create(Context, CurContext, 9957 AsmString, StartLoc, 9958 EndLoc); 9959 CurContext->addDecl(New); 9960 return New; 9961} 9962 9963DeclResult Sema::ActOnModuleImport(SourceLocation AtLoc, 9964 SourceLocation ImportLoc, 9965 ModuleIdPath Path) { 9966 Module *Mod = PP.getModuleLoader().loadModule(ImportLoc, Path, 9967 Module::AllVisible, 9968 /*IsIncludeDirective=*/false); 9969 if (!Mod) 9970 return true; 9971 9972 llvm::SmallVector<SourceLocation, 2> IdentifierLocs; 9973 Module *ModCheck = Mod; 9974 for (unsigned I = 0, N = Path.size(); I != N; ++I) { 9975 // If we've run out of module parents, just drop the remaining identifiers. 9976 // We need the length to be consistent. 9977 if (!ModCheck) 9978 break; 9979 ModCheck = ModCheck->Parent; 9980 9981 IdentifierLocs.push_back(Path[I].second); 9982 } 9983 9984 ImportDecl *Import = ImportDecl::Create(Context, 9985 Context.getTranslationUnitDecl(), 9986 AtLoc.isValid()? AtLoc : ImportLoc, 9987 Mod, IdentifierLocs); 9988 Context.getTranslationUnitDecl()->addDecl(Import); 9989 return Import; 9990} 9991 9992void Sema::ActOnPragmaWeakID(IdentifierInfo* Name, 9993 SourceLocation PragmaLoc, 9994 SourceLocation NameLoc) { 9995 Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc, LookupOrdinaryName); 9996 9997 if (PrevDecl) { 9998 PrevDecl->addAttr(::new (Context) WeakAttr(PragmaLoc, Context)); 9999 } else { 10000 (void)WeakUndeclaredIdentifiers.insert( 10001 std::pair<IdentifierInfo*,WeakInfo> 10002 (Name, WeakInfo((IdentifierInfo*)0, NameLoc))); 10003 } 10004} 10005 10006void Sema::ActOnPragmaWeakAlias(IdentifierInfo* Name, 10007 IdentifierInfo* AliasName, 10008 SourceLocation PragmaLoc, 10009 SourceLocation NameLoc, 10010 SourceLocation AliasNameLoc) { 10011 Decl *PrevDecl = LookupSingleName(TUScope, AliasName, AliasNameLoc, 10012 LookupOrdinaryName); 10013 WeakInfo W = WeakInfo(Name, NameLoc); 10014 10015 if (PrevDecl) { 10016 if (!PrevDecl->hasAttr<AliasAttr>()) 10017 if (NamedDecl *ND = dyn_cast<NamedDecl>(PrevDecl)) 10018 DeclApplyPragmaWeak(TUScope, ND, W); 10019 } else { 10020 (void)WeakUndeclaredIdentifiers.insert( 10021 std::pair<IdentifierInfo*,WeakInfo>(AliasName, W)); 10022 } 10023} 10024 10025Decl *Sema::getObjCDeclContext() const { 10026 return (dyn_cast_or_null<ObjCContainerDecl>(CurContext)); 10027} 10028 10029AvailabilityResult Sema::getCurContextAvailability() const { 10030 const Decl *D = cast<Decl>(getCurLexicalContext()); 10031 // A category implicitly has the availability of the interface. 10032 if (const ObjCCategoryDecl *CatD = dyn_cast<ObjCCategoryDecl>(D)) 10033 D = CatD->getClassInterface(); 10034 10035 return D->getAvailability(); 10036} 10037